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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.4598 | Harold G. Evans | Harold G. Evans (for the CDF and D0 collaborations) | Bs Physics at CDF and D0 | added Fermilab-Conf number, corrected two misquoted theoretical
results | Frascati Phys.Ser.44:421-436,2007 | null | FERMILAB-CONF/07-146-E | hep-ex | null | Run II at the Tevatron has seen an explosion of results related to the Bs
meson, ranging from tests of QCD models, to probes of electro-weak symmetry
breaking, to direct searches for new physics effects. I will briefly summarize
the CDF and D0 Bs-physics programs, describing the suitability of the detectors
for doing this kind of physics, and pointing out how our knowledge of important
quantities has improved through Run II measurements.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:00:27 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Jun 2007 12:34:23 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"Evans",
"Harold G.",
"",
"for the CDF and D0 collaborations"
]
] |
0705.4599 | Prakash Mathews | Prakash Mathews, V. Ravindran | Unparticle physics at hadron collider via dilepton production | 11 pages, 9 figures, version to appear in Phys. Lett. B | Phys.Lett.B657:198-206,2007 | 10.1016/j.physletb.2007.10.018 | SINP/TNP/2007-15 | hep-ph hep-ex | null | The scale invariant unparticle physics recently proposed by Georgi could
manifest at low energies as non integral number d_U of invisible particles.
Unparticles if existing, could couple to the Standard Model fields and
consequently affect the collider phenomenology. We consider the DY process to
explore effects of the peculiar propagator of the scalar and tensor unparticle
operators. To probe these effects at hadron collider one needs to go beyond LO
in QCD and hence the quantitative impact of QCD corrections for unparticle
physics at LHC is investigated. We present the K-factors at LHC. Inclusion of
QCD corrections to NLO stabilises the cross section with respect to scale
variations.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:00:45 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 05:35:23 GMT"
},
{
"version": "v3",
"created": "Wed, 24 Oct 2007 07:50:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mathews",
"Prakash",
""
],
[
"Ravindran",
"V.",
""
]
] |
0705.4600 | Igor V. Volovich | V.S.Vladimirov | Nonlinear equations for p-adic open, closed, and open-closed strings | 16 pages, 3 figures | Theor.Math.Phys.149:1604-1616,2006; Teor.Mat.Fiz.149:354-367,2006 | 10.1007/s11232-006-0144-z | null | math-ph hep-th math.AP math.MP | null | We investigate the structure of solutions of boundary value problems for a
one-dimensional nonlinear system of pseudodifferential equations describing the
dynamics (rolling) of p-adic open, closed, and open-closed strings for a scalar
tachyon field using the method of successive approximations. For an open-closed
string, we prove that the method converges for odd values of p of the form
p=4n+1 under the condition that the solution for the closed string is known.
For p=2, we discuss the questions of the existence and the nonexistence of
solutions of boundary value problems and indicate the possibility of
discontinuous solutions appearing.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:14:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vladimirov",
"V. S.",
""
]
] |
0705.4601 | Suzanne Ramsay Howat | Suzanne K. Ramsay Howat, Jane S. Greaves | Molecular Hydrogen emission from disks in the eta Chamaeleontis cluster | Accepted for publication in MNRAS. 9 pages | Mon.Not.Roy.Astron.Soc.379:1658-1664,2007 | 10.1111/j.1365-2966.2007.12049.x | null | astro-ph | null | Disks in the 6 Myr old cluster eta Chamaeleontis were searched for emission
from hot H2. Around the M3 star ECHAJ0843.3-7905 we detect circumstellar gas
orbiting at ~2 AU. If the gas is UV-excited, the ro-vibrational line traces a
hot gas layer supported by a disk of mass ~0.03Msolar, similar to the minimum
mass solar nebula. Such a gas reservoir at 6 Myr would promote the formation
and inwards migration of gas giant planets.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:16:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Howat",
"Suzanne K. Ramsay",
""
],
[
"Greaves",
"Jane S.",
""
]
] |
0705.4602 | Stefan Kebekus | Marian Aprodu, Stefan Kebekus and Thomas Peternell | Endomorphisms of projective varieties | References were added and a few typos were fixed | null | null | null | math.AG | null | We study complex projective manifolds X that admit surjective endomorphisms
f:X->X of degree at least two. In case f is etale, we prove structure theorems
that describe X. In particular, a rather detailed description is given if X is
a uniruled threefold. As to the ramified case, we first prove a general theorem
stating that the vector bundle associated to a Galois covering of projective
manifolds is ample (resp. nef) under very mild conditions. This is applied to
the study of ramified endomorphisms of Fano manifolds with second Betti number
one. It is conjectured that the projective space is the only Fano manifold
admitting admitting an endomorphism of degree d>1, and we prove that in several
cases.
A part of the argumentation is based on a new characterization of the
projective space as the only manifold that admits an ample subsheaf in its
tangent bundle.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:20:10 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 16:11:34 GMT"
}
] | 2007-06-22T00:00:00 | [
[
"Aprodu",
"Marian",
""
],
[
"Kebekus",
"Stefan",
""
],
[
"Peternell",
"Thomas",
""
]
] |
0705.4603 | Michael Gruberbauer | Michael Gruberbauer, Katrien Kohlenberg, Jason F. Rowe, Daniel Huber,
Jaymie M. Matthews, Piet Reegen, Rainer Kuschnig, Chris Cameron, Thomas
Kallinger, Werner W. Weiss, David B. Guenther, Anthony F. J. Moffat, Slavek
Rucinski, Dimitar Sasselov, Gordon A. H. Walker | MOST photometry of the RRd Lyrae variable AQ Leo: Two radial modes, 32
combination frequencies, and beyond | accepted for publication in MNRAS; revision v2 : broken references
have been fixed | Mon.Not.Roy.Astron.Soc.379:1498-1506,2007 | 10.1111/j.1365-2966.2007.12042.x | null | astro-ph | null | Highly precise and nearly uninterrupted optical photometry of the RR Lyrae
star AQ Leo was obtained with the MOST (Microvariability & Oscillations of
STars) satellite over 34.4 days in February-March 2005. AQ Leo was the first
known double-mode RR Lyrae pulsator (RRd star). Three decades after its
discovery, MOST observations have revealed that AQ Leo oscillates with at least
42 frequencies, of which 32 are linear combinations (up to the sixth order) of
the radial fundamental mode and its first overtone. Evidence for period changes
of these modes is found in the data. The other intrinsic frequencies may
represent an additional nonradial pulsation mode and its harmonics (plus linear
combinations) which warrant theoretical modeling. The unprecedented number of
frequencies detected with amplitudes down to millimag precision also presents
an opportunity to test nonlinear theories of mode growth and saturation in RR
Lyrae pulsators.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:27:20 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 09:46:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gruberbauer",
"Michael",
""
],
[
"Kohlenberg",
"Katrien",
""
],
[
"Rowe",
"Jason F.",
""
],
[
"Huber",
"Daniel",
""
],
[
"Matthews",
"Jaymie M.",
""
],
[
"Reegen",
"Piet",
""
],
[
"Kuschnig",
"Rainer",
""
],
[
"Cameron",
"Chris",
""
],
[
"Kallinger",
"Thomas",
""
],
[
"Weiss",
"Werner W.",
""
],
[
"Guenther",
"David B.",
""
],
[
"Moffat",
"Anthony F. J.",
""
],
[
"Rucinski",
"Slavek",
""
],
[
"Sasselov",
"Dimitar",
""
],
[
"Walker",
"Gordon A. H.",
""
]
] |
0705.4604 | Henrik Reif Andersen | Henrik Reif Andersen and Kaare J. Kristoffersen | Temporal Runtime Verification using Monadic Difference Logic | null | null | null | null | cs.LO | null | In this paper we present an algorithm for performing runtime verification of
a bounded temporal logic over timed runs. The algorithm consists of three
elements. First, the bounded temporal formula to be verified is translated into
a monadic first-order logic over difference inequalities, which we call monadic
difference logic. Second, at each step of the timed run, the monadic difference
formula is modified by computing a quotient with the state and time of that
step. Third, the resulting formula is checked for being a tautology or being
unsatisfiable by a decision procedure for monadic difference logic.
We further provide a simple decision procedure for monadic difference logic
based on the data structure Difference Decision Diagrams. The algorithm is
complete in a very strong sense on a subclass of temporal formulae
characterized as homogeneously monadic and it is approximate on other formulae.
The approximation comes from the fact that not all unsatisfiable or
tautological formulae are recognised at the earliest possible time of the
runtime verification.
Contrary to existing approaches, the presented algorithms do not work by
syntactic rewriting but employ efficient decision structures which make them
applicable in real applications within for instance business software.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:22:02 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Andersen",
"Henrik Reif",
""
],
[
"Kristoffersen",
"Kaare J.",
""
]
] |
0705.4605 | Pai-Yi Hsiao | Yu-Fu Wei and Pai-Yi Hsiao | Role of chain stiffness on the conformation of single polyelectrolytes
in salt solutions | 52 pages, 15 figures, accepted for publication in JCP | J. Chem. Phys. 127 (2007) 064901; selected for the August 2007
issue of JCP: BioChemical Physics | 10.1063/1.2751195 | null | cond-mat.soft cond-mat.stat-mech | null | Conformation of single polyelectrolytes in tetravalent salt solutions is
investigated under the framework of a coarse-grained model, using Langevin
dynamics simulations. The chain size, studied by the radius of gyration, shows
three different variational behaviors with salt concentration, depending on the
chain stiffness. According to these behaviors, polyelectrolytes of fixed chain
length are classified into three categories: flexible chain, semiflexible
chain, and rigid chain. The worm-like chain model with persistence length
predicted by the Odijk-Skolnick-Fixman theory is found to be able to
qualitatively describe the end-to-end distance at low salt concentration. In a
low-salt region, a flexible polyelectrolyte extends more significantly than a
semiflexible chain, and in a high-salt region, regardless of chain stiffness, a
chain attains a dimension comparable to that of its neutral polymer. The chain
stiffness influences both the local and the global chain structures. A flexible
chain exhibits a zigzagged local structure in the presence of salt ions and the
condensed structure is a disordered, random globule. A semiflexible chain is
locally smooth, and the condensed structure is orderly packed, taking a form
such as hairpin or toroid. Moreover, the chain stiffness can also affect the
nature of the coil-globule transition. The transition is occurred in a discrete
manner for semiflexible chain, whereas in a continuous way for flexible chain.
This discrete feature is happened not only at low salt concentration when a
semiflexible chain is collapsed, but also at high salt concentration when the
collapsed chain is reexpanded. At the end, the effects of chain stiffness and
salt concentration on the conformation of single polyelectrolytes are
summarized in a schematic state diagram.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 01:13:26 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Wei",
"Yu-Fu",
""
],
[
"Hsiao",
"Pai-Yi",
""
]
] |
0705.4606 | Marco Pellegrini | Filippo Geraci and Marco Pellegrini | Dynamic User-Defined Similarity Searching in Semi-Structured Text
Retrieval | Submitted to Spire 2007 | null | null | IIT TR-07/2007 | cs.IR cs.DS | null | Modern text retrieval systems often provide a similarity search utility, that
allows the user to find efficiently a fixed number k of documents in the data
set that are most similar to a given query (here a query is either a simple
sequence of keywords or the identifier of a full document found in previous
searches that is considered of interest). We consider the case of a textual
database made of semi-structured documents. Each field, in turns, is modelled
with a specific vector space. The problem is more complex when we also allow
each such vector space to have an associated user-defined dynamic weight that
influences its contribution to the overall dynamic aggregated and weighted
similarity. This dynamic problem has been tackled in a recent paper by
Singitham et al. in in VLDB 2004. Their proposed solution, which we take as
baseline, is a variant of the cluster-pruning technique that has the potential
for scaling to very large corpora of documents, and is far more efficient than
the naive exhaustive search. We devise an alternative way of embedding weights
in the data structure, coupled with a non-trivial application of a clustering
algorithm based on the furthest point first heuristic for the metric k-center
problem. The validity of our approach is demonstrated experimentally by showing
significant performance improvements over the scheme proposed in Singitham et
al. in VLDB 2004. We improve significantly tradeoffs between query time and
output quality with respect to the baseline method in Singitham et al. in in
VLDB 2004, and also with respect to a novel method by Chierichetti et al. to
appear in ACM PODS 2007. We also speed up the pre-processing time by a factor
at least thirty.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:46:39 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Geraci",
"Filippo",
""
],
[
"Pellegrini",
"Marco",
""
]
] |
0705.4607 | Marcus Aguiar de | David D. Chinellato, Marcus A.M. de Aguiar, Irving R. Epstein, Dan
Braha and Yaneer Bar-Yam | Dynamical Response of Networks under External Perturbations: Exact
Results | 4 pages, 3 figures | null | null | null | nlin.SI nlin.CG | null | We introduce and solve a general model of dynamic response under external
perturbations. This model captures a wide range of systems out of equilibrium
including Ising models of physical systems, social opinions, and population
genetics. The distribution of states under perturbation and relaxation process
reflects two regimes -- one driven by the external perturbation, and one driven
by internal ordering. These regimes parallel the disordered and ordered regimes
of equilibrium physical systems driven by thermal perturbations but here are
shown to be relevant for non-thermal and non-equilibrium external influences on
complex biological and social systems. We extend our results to a wide range of
network topologies by introducing an effective strength of external
perturbation by analytic mean-field approximation. Simulations show this
generalization is remarkably accurate for many topologies of current interest
in describing real systems.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:53:14 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 10:38:19 GMT"
}
] | 2007-11-19T00:00:00 | [
[
"Chinellato",
"David D.",
""
],
[
"de Aguiar",
"Marcus A. M.",
""
],
[
"Epstein",
"Irving R.",
""
],
[
"Braha",
"Dan",
""
],
[
"Bar-Yam",
"Yaneer",
""
]
] |
0705.4608 | Gregory S. Warrington | Nicholas A. Loehr, Gregory S. Warrington | Nested quantum Dyck paths and nabla(s_lambda) | 23 pages | null | null | null | math.CO | null | We conjecture a combinatorial formula for the monomial expansion of the image
of any Schur function under the Bergeron-Garsia nabla operator. The formula
involves nested labeled Dyck paths weighted by area and a suitable "diagonal
inversion" statistic. Our model includes as special cases many previous
conjectures connecting the nabla operator to quantum lattice paths. The
combinatorics of the inverse Kostka matrix leads to an elementary proof of our
proposed formula when q=1. We also outline a possible approach for proving all
the extant nabla conjectures that reduces everything to the construction of
sign-reversing involutions on explicit collections of signed, weighted objects.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:03:43 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Loehr",
"Nicholas A.",
""
],
[
"Warrington",
"Gregory S.",
""
]
] |
0705.4609 | Salvatore Capozziello | S.A. Ali, S. Capozziello | Nonlinear Realization of the Local Conform-Affine Symmetry Group for
Gravity in the Composite Fiber Bundle Formalism | 24 pages. to appear in IJGMMP | Int.J.Geom.Meth.Mod.Phys.4:1041-1074,2007 | 10.1142/S0219887807002429 | null | gr-qc | null | A gauge theory of gravity based on a nonlinear realization (NLR) of the local
Conform-Affine (CA) group of symmetry transformations is presented. The coframe
fields and gauge connections of the theory are obtained. The tetrads and
Lorentz group metric are used to induce a spacetime metric. The inhomogenously
transforming (under the Lorentz group) connection coefficients serve as
gravitational gauge potentials used to define covariant derivatives
accommodating minimal coupling of matter and gauge fields. On the other hand,
the tensor valued connection forms serve as auxillary dynamical fields
associated with the dilation, special conformal and deformational (shear)
degrees of freedom inherent in the bundle manifold. The bundle curvature of the
theory is determined. Boundary topological invariants are constructed. They
serve as a prototype (source free) gravitational Lagrangian. The Bianchi
identities, covariant field equations and gauge currents are obtained.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 13:57:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ali",
"S. A.",
""
],
[
"Capozziello",
"S.",
""
]
] |
0705.4610 | Fabio Lepreti Dr. | Silvia Perri, Fabio Lepreti, Vincenzo Carbone, Angelo Vulpiani | Position and velocity space diffusion of test particles in stochastic
electromagnetic fields | 10 pages, 4 figures | Europhys. Lett. 78, 40003 (2007) | 10.1209/0295-5075/78/40003 | null | cond-mat.stat-mech nlin.CD | null | The two--dimensional diffusive dynamics of test particles in a random
electromagnetic field is studied. The synthetic electromagnetic fluctuations
are generated through randomly placed magnetised ``clouds'' oscillating with a
frequency $\omega$. We investigate the mean square displacements of particles
in both position and velocity spaces. As $\omega$ increases the particles
undergo standard (Brownian--like) motion, anomalous diffusion and ballistic
motion in position space. Although in general the diffusion properties in
velocity space are not trivially related to those in position space, we find
that energization is present only when particles display anomalous diffusion in
position space. The anomalous character of the diffusion is only in the
non--standard values of the scaling exponents while the process is Gaussian.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:02:37 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Perri",
"Silvia",
""
],
[
"Lepreti",
"Fabio",
""
],
[
"Carbone",
"Vincenzo",
""
],
[
"Vulpiani",
"Angelo",
""
]
] |
0705.4611 | Jeremy Shears | Jeremy Shears, Roger Pickard, Tom Krajci, Gary Poyner | Photometry of the dwarf nova AW Sagittae during the 2006 November
superoutburst | 10 pages, 9 figures. Accepted for publication in the Journal of the
British Astronomical Association | null | null | null | astro-ph | null | During 2006 November an outburst of the dwarf nova AW Sge was observed using
CCD photometry. This revealed 0.25 magnitude superhumps confirming it to be a
superoutburst, possibly only the second confirmed such outburst of this star.
The superhumps were observed for 4 days and had a stable period Psh =
0.0745(2)d, a value which is consistent with Psh measured during the 2000
superoutburst.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:03:43 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Shears",
"Jeremy",
""
],
[
"Pickard",
"Roger",
""
],
[
"Krajci",
"Tom",
""
],
[
"Poyner",
"Gary",
""
]
] |
0705.4612 | Mark Hillery | Edgar Feldman and Mark Hillery | Modifying quantum walks: A scattering theory approach | 22 pages and 1 figure | null | 10.1088/1751-8113/40/37/011 | null | quant-ph | null | We show how to construct discrete-time quantum walks on directed, Eulerian
graphs. These graphs have tails on which the particle making the walk
propagates freely, and this makes it possible to analyze the walks in terms of
scattering theory. The probability of entering a graph from one tail and
leaving from another can be found from the scattering matrix of the graph. We
show how the scattering matrix of a graph that is an automorphic image of the
original is related to the scattering matrix of the original graph, and we show
how the scattering matrix of the reverse graph is related to that of the
original graph. Modifications of graphs and the effects of these modifications
are then considered. In particular we show how the scattering matrix of a graph
is changed if we remove two tails and replace them with an edge or cut an edge
and add two tails. This allows us to combine graphs, that is if we connect two
graphs we can construct the scattering matrix of the combined graph from those
of its parts. Finally, using these techniques, we show how two graphs can be
compared by constructing a larger larger graph in which the two original graphs
are in parallel, and performing a quantum walk on the larger graph. This is a
kind of quantum walk interferometry.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:12:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Feldman",
"Edgar",
""
],
[
"Hillery",
"Mark",
""
]
] |
0705.4613 | Rutwig C. Stursberg | R. Campoamor-Stursberg | Contractions and deformations of quasi-classical Lie algebras preserving
a non-degenerate quadratic Casimir operator | 12 pages. LATEX with revtex4; Proceedings of the XII International
Conference on Symmetry Methods in Physics, (Yerevan, 2006) eds. G.S. Pogosyan
et al; | Phys.Atom.Nucl.71:830-835,2008 | 10.1134/S1063778808050104 | null | hep-th | null | By means of contractions of Lie algebras, we obtain new classes of
indecomposable quasi-classical Lie algebras that satisfy the Yang-Baxter
equations in its reformulation in terms of triple products. These algebras are
shown to arise naturally from non-compact real simple algebras with non-simple
complexification, where we impose that a non-degenerate quadratic Casimir
operator is preserved by the limiting process. We further consider the converse
problem, and obtain sufficient conditions on integrable cocycles of
quasi-classical Lie algebras in order to preserve non-degenerate quadratic
Casimir operators by the associated linear deformations.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:14:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Campoamor-Stursberg",
"R.",
""
]
] |
0705.4614 | Markus Wittkowski | M. Wittkowski, D. A. Boboltz, K. Ohnaka, T. Driebe, M. Scholz | The Mira variable S Ori: Relationships between the photosphere,
molecular layer, dust shell, and SiO maser shell at 4 epochs | Accepted for publication in A&A. See ESO press release 25/07 at
http://www.eso.org/public/outreach/press-rel/pr-2007/pr-25-07.html | A&A, 470, 191 (2007) | 10.1051/0004-6361:20077168 | null | astro-ph | null | We present the first multi-epoch study that includes concurrent mid-infrared
and radio interferometry of an oxygen-rich Mira star. We obtained mid-infrared
interferometry of S Ori with VLTI/MIDI at four epochs between December 2004 and
December 2005. We concurrently observed v=1, J=1-0 (43.1 GHz), and v=2, J=1-0
(42.8 GHz) SiO maser emission toward S Ori with the VLBA at three epochs. The
MIDI data are analyzed using self-excited dynamic model atmospheres including
molecular layers, complemented by a radiative transfer model of the
circumstellar dust shell. The VLBA data are reduced to the spatial structure
and kinematics of the maser spots. The modeling of our MIDI data results in
phase-dependent continuum photospheric angular diameters between about 7.9 mas
(Phase 0.55) and 9.7 mas (Phase 1.16). The dust shell can best be modeled with
Al2O3 grains using phase-dependent inner boundary radii between 1.8 and 2.4
photospheric radii. The dust shell appears to be more compact with greater
optical depth near visual minimum, and more extended with lower optical depth
after visual maximum. The ratios of the SiO maser ring radii to the
photospheric radii are between about 1.9 and 2.4. The maser spots mark the
region of the molecular atmospheric layers just beyond the steepest decrease in
the mid-infrared model intensity profile. Their velocity structure indicates a
radial gas expansion. Al2O3 dust grains and SiO maser spots form at relatively
small radii of 1.8-2.4 photospheric radii. Our results suggest increased mass
loss and dust formation close to the surface near the minimum visual phase,
when Al2O3 dust grains are co-located with the molecular gas and the SiO maser
shells, and a more expanded dust shell after visual maximum. Silicon does not
appear to be bound in dust, as our data show no sign of silicate grains.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:15:06 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Wittkowski",
"M.",
""
],
[
"Boboltz",
"D. A.",
""
],
[
"Ohnaka",
"K.",
""
],
[
"Driebe",
"T.",
""
],
[
"Scholz",
"M.",
""
]
] |
0705.4615 | Nataliya A. Goncharuk | N. A. Goncharuk, L. Smrcka, P. Svoboda, P. Vasek, J. Kucera, Yu.
Krupko, W. Wegscheider | Illumination-induced changes of the Fermi surface topology in
three-dimensional superlattices | 7 pages, 6 figures, accepted for publication in Phys. Rev. B | Phys. Rev. B 75 (2007) 245322 (1-7) | 10.1103/PhysRevB.75.245322 | null | cond-mat.mes-hall | null | The magnetoresistance of the MBE-grown GaAs/AlGaAs superlattice with Si-doped
barriers has been measured in tilted magnetic fields in the as-grown state, and
after brief illumination by a red-light diode at low temperature, T is
approximately 0.3 K. A remarkable illumination-induced modification of
magnetoresistance curves has been observed, which indicates a significant
change of the superlattice Fermi surface topology. Analysis of
magnetoresistance data in terms of the tight-binding model reveals that not
only electron concentration and mobility have been increased by illumination,
but also the coupling among 2D electron layers in neighboring quantum wells has
been reduced.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:17:32 GMT"
}
] | 2007-07-25T00:00:00 | [
[
"Goncharuk",
"N. A.",
""
],
[
"Smrcka",
"L.",
""
],
[
"Svoboda",
"P.",
""
],
[
"Vasek",
"P.",
""
],
[
"Kucera",
"J.",
""
],
[
"Krupko",
"Yu.",
""
],
[
"Wegscheider",
"W.",
""
]
] |
0705.4616 | Jeremy Shears | Jeremy Shears, Geir Klingenberg, Pierre de Ponthiere | Observations of the first confirmed superoutburst of SDSS
J080434.20+510349.2 in 2006 March | 12 pages, 7 figures. Accepted for publication in the Journal of the
British Astronomical Association | null | null | null | astro-ph | null | During 2006 March the first confirmed superoutburst of the dwarf nova SDSS
J080434.20+510349.2 was observed using unfiltered CCD photometry. Time-series
photometry revealed superhumps with a period of 0.0597 +/- 0.0011 d and an
amplitude of 0.2 magnitude, thereby independently establishing its UGSU
classification. Following the decline from a peak magnitude of 13.1, at least
two rebrightening events were observed. Evidence is presented which is
consistent with the star being a member of the UGWZ sub-class.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:18:00 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Shears",
"Jeremy",
""
],
[
"Klingenberg",
"Geir",
""
],
[
"de Ponthiere",
"Pierre",
""
]
] |
0705.4617 | B. Lee Roberts | David W. Hertzog, James P. Miller, Eduardo de Rafael, B.Lee Roberts,
Dominik Stockinger | The Physics Case for the New Muon (g-2) Experiment | 18 pages, 7 figures | null | null | null | hep-ph hep-ex | null | This White Paper briefly reviews the present status of the muon (g-2)
experiment and the physics motivation for a new effort. The present comparison
between experiment and theory indicates a tantalizing $3.4 \sigma$ deviation.
An improvement in precision on this comparison by a factor of 2--with the
central value remaining unchanged--will exceed the ``discovery'' threshold,
with a sensitivity above $6 \sigma$. The 2.5-fold reduction improvement goal of
the new Brookhaven E969 experiment, along with continued steady reduction of
the standard model theory uncertainty, will achieve this more definitive test.
Already, the (g-2) result is arguably the most compelling indicator of
physics beyond the standard model and, at the very least, it represents a major
constraint for speculative new theories such as supersymmetry or extra
dimensions. In this report, we summarize the present experimental status and
provide an up-to-date accounting of the standard model theory, including the
expectations for improvement in the hadronic contributions, which dominate the
overall uncertainty. Our primary focus is on the physics case that motivates
improved experimental and theoretical efforts. Accordingly, we give examples of
specific new-physics implications in the context of direct searches at the LHC
as well as general arguments about the role of an improved (g-2) measurement. A
brief summary of the plans for an upgraded effort complete the report.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:31:00 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Hertzog",
"David W.",
""
],
[
"Miller",
"James P.",
""
],
[
"de Rafael",
"Eduardo",
""
],
[
"Roberts",
"B. Lee",
""
],
[
"Stockinger",
"Dominik",
""
]
] |
0705.4618 | Roberto Bagnara | Roberto Bagnara, Patricia M. Hill, Enea Zaffanella | An Improved Tight Closure Algorithm for Integer Octagonal Constraints | 15 pages, 2 figures | null | null | null | cs.DS cs.CG cs.LO | null | Integer octagonal constraints (a.k.a. ``Unit Two Variables Per Inequality''
or ``UTVPI integer constraints'') constitute an interesting class of
constraints for the representation and solution of integer problems in the
fields of constraint programming and formal analysis and verification of
software and hardware systems, since they couple algorithms having polynomial
complexity with a relatively good expressive power. The main algorithms
required for the manipulation of such constraints are the satisfiability check
and the computation of the inferential closure of a set of constraints. The
latter is called `tight' closure to mark the difference with the (incomplete)
closure algorithm that does not exploit the integrality of the variables. In
this paper we present and fully justify an O(n^3) algorithm to compute the
tight closure of a set of UTVPI integer constraints.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:32:46 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 08:17:11 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Bagnara",
"Roberto",
""
],
[
"Hill",
"Patricia M.",
""
],
[
"Zaffanella",
"Enea",
""
]
] |
0705.4619 | Michael T. Lacey | Dmitry Bilyk, Michael Lacey, Armen Vagharshakyan | On the Small Ball Inequality in All Dimensions | 33 pages, 2 figures. Final version of the paper. To appear in J Funct
Analy | null | null | null | math.CA math.PR | null | Let h_R denote an L ^{\infty} normalized Haar function adapted to a dyadic
rectangle R contained in the unit cube in dimension d. We establish a
non-trivial lower bound on the L^{\infty} norm of the `hyperbolic' sums $$ \sum
_{|R|=2 ^{-n}} \alpha(R) h_R (x) $$ The lower bound is non-trivial in that we
improve the average case bound by n^{\eta} for some positive \eta, a function
of dimension d. As far as the authors know, this is the first result of this
type in dimension 4 and higher.
This question is related to Conjectures in (1) Irregularity of Distributions,
(2) Approximation Theory and (3) Probability Theory. The method of proof of
this paper gives new results on these conjectures in all dimensions 4 and
higher.
This paper builds upon prior work of Jozef Beck, from 1989, and first two
authors from 2006. These results were of the same nature, but only in dimension
3.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:39:56 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Jul 2007 23:13:34 GMT"
},
{
"version": "v3",
"created": "Sun, 16 Sep 2007 22:31:12 GMT"
}
] | 2007-09-17T00:00:00 | [
[
"Bilyk",
"Dmitry",
""
],
[
"Lacey",
"Michael",
""
],
[
"Vagharshakyan",
"Armen",
""
]
] |
0705.4620 | Dongwoo Cha | Doohwan Kim, Eunja Ha, and Dongwoo Cha | Universal Expression for the Lowest Excitation Energy of Natural Parity
Even Multipole States | 10 pages, 5 figures | Nucl.Phys.A799:46-55,2008 | 10.1016/j.nuclphysa.2007.10.006 | null | nucl-th | null | We present a new expression for the energy of the lowest collective states in
even-even nuclei throughout the entire periodic table. Our empirical formula is
extremely valid and holds universally for all of the natural parity even
multipole states. This formula depends only on the mass number and the valence
nucleon numbers with six parameters. These parameters are determined easily and
unambiguously from the data for each multipole state. We discuss the validity
of our empirical formula by comparing our results with those of other studies
and also by estimating the average and the dispersion of the logarithmic errors
of the calculated excitation energies with respect to the measured ones.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:40:24 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Oct 2007 05:53:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"Doohwan",
""
],
[
"Ha",
"Eunja",
""
],
[
"Cha",
"Dongwoo",
""
]
] |
0705.4621 | Arti Goyal | A. Goyal (ARIES, Nainital), Gopal-Krishna (NCRA-TIFR, Pune), Ram Sagar
(ARIES, Nainital), G.C.Anupama (IIA, Bangalore), D.K. Sahu (CREST-IIA
Bangalore) | Further evidence for intra-night optical variability of radio-quiet
quasars | 15 Pages, 4 Tables, 24 Figures; Accepted in BASI | null | null | null | astro-ph | null | Although well established for BL Lac objects and radio-loud quasars, the
occurrence of intra-night optical variability (INOV) in radio-quiet quasars is
still debated, primarily since only a handful of INOV events with good
statistical significance, albeit small amplitude, have been reported so far.
This has motivated us to continue intra-night optical monitoring of bona-fide
radio-quiet quasars (RQQs). Here we present the results for a sample of 11 RQQs
monitored by us on 19 nights. On 5 of these nights a given RQQ was monitored
simultaneously from two well separated observatories. In all, two clear cases
and two probable case of INOV were detected. From these data, we estimate an
INOV duty cycle of $\sim$8% for RQQs which would increase to 19% if the
`probable variable' cases are also included. Such comparatively small INOV duty
cycles for RQQs, together with the small INOV amplitudes ($\sim$1%), are in
accord with the previously deduced characteristics of this phenomenon.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:45:40 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Goyal",
"A.",
"",
"ARIES, Nainital"
],
[
"Gopal-Krishna",
"",
"",
"NCRA-TIFR, Pune"
],
[
"Sagar",
"Ram",
"",
"ARIES, Nainital"
],
[
"Anupama",
"G. C.",
"",
"IIA, Bangalore"
],
[
"Sahu",
"D. K.",
"",
"CREST-IIA\n Bangalore"
]
] |
0705.4622 | Nicolas Martin | N. F. Martin (MPIA, Heidelberg), R. A. Ibata (Observatoire de
Strasbourg), S.C. Chapman (IoA, Cambridge), M. Irwin (IoA, Cambridge), G. F.
Lewis (Univ. Sydney) | A Keck/DEIMOS spectroscopic survey of faint Galactic satellites:
searching for the least massive dwarf galaxies | 24 pages, 11 figures, MNRAS accepted | Mon.Not.Roy.Astron.Soc.380:281-300,2007 | 10.1111/j.1365-2966.2007.12055.x | null | astro-ph | null | [abridged] We present the results of a spectroscopic survey of the recently
discovered faint Milky Way satellites Boo, UMaI, UMaII and Wil1. Using the
DEIMOS spectrograph on Keck, we have obtained samples that contain from 15 to
85 probable members of these satellites for which we derive radial velocities
precise to a few km/s down to i~21-22. About half of these stars are observed
with a high enough S/N to estimate their metallicity to within \pm0.2 dex. From
this dataset, we show that UMaII is the only object that does not show a clear
radial velocity peak. However, the measured systemic radial velocity
(v_r=115\pm5 km/s) is in good agreement with recent simulations in which this
object is the progenitor of the recently discovered Orphan Stream. The three
other satellites show velocity dispersions that make them highly dark-matter
dominated systems. In particular the Willman 1 object is not a globular cluster
given its metallicity scatter over -2.0<[Fe/H]<-1.0 and is therefore almost
certainly a dwarf galaxy or dwarf galaxy remnant. We measure a radial velocity
dispersion of only 4.3_{-1.3}^{+2.3} km/s around a systemic velocity of
-12.3\pm2.3 km/s which implies a mass-to-light ratio of ~700 and a total mass
of ~5x10^5 Msun for this satellite, making it the least massive satellite
galaxy known to date. Such a low mass could mean that the 10^7 Msun limit that
had until now never been crossed for Milky Way and Andromeda satellite galaxies
may only be an observational limit and that fainter, less massive systems exist
within the Local Group. However, more modeling and an extended search for
potential extra-tidal stars are required to rule out the possibility that these
systems have not been significantly heated by tidal interaction.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:45:50 GMT"
}
] | 2010-03-01T00:00:00 | [
[
"Martin",
"N. F.",
"",
"MPIA, Heidelberg"
],
[
"Ibata",
"R. A.",
"",
"Observatoire de\n Strasbourg"
],
[
"Chapman",
"S. C.",
"",
"IoA, Cambridge"
],
[
"Irwin",
"M.",
"",
"IoA, Cambridge"
],
[
"Lewis",
"G. F.",
"",
"Univ. Sydney"
]
] |
0705.4623 | Tracey Hill | T. Hill, M. G. Burton, M. R. Cunningham, V. Minier | Profiling Young Massive Stars | 5 pages with figures | null | 10.1017/S1743921307012665 | null | astro-ph | null | We present the results of spectral energy distribution analysis for 162 of
the 405 sources reported in the SIMBA survey of Hill et al. (2005). The fits
reveal source specific parameters including: the luminosity, mass, temperature,
H$_2$ number density, the surface density and the luminosity-to-mass ratio.
Each of these parameters are examined with respect to the four classes of
source present in the sample. Obvious luminosity and temperature distinctions
exist between the mm-only cores and those cores with methanol maser and/or
radio continuum emission, with the former cooler and less luminous than the
latter. The evidence suggests that the mm-only cores are a precursor to the
methanol maser in the formation of massive stars. The mm-only cores comprise
two distinct populations distinguished by temperature. Analysis and conclusions
about the nature of the cool-mm and warm-mm cores comprising the mm-only
population are drawn.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:48:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hill",
"T.",
""
],
[
"Burton",
"M. G.",
""
],
[
"Cunningham",
"M. R.",
""
],
[
"Minier",
"V.",
""
]
] |
0705.4624 | Maxim Chernodub | M.N. Chernodub and I.E. Kozlov | Topological susceptibility in Yang-Mills theory in the vacuum correlator
method | 5 pages (JETP Letters style) | JETP Lett.86:1-5,2007 | 10.1134/S0021364007130012 | ITEP-LAT/2007-10 | hep-ph hep-lat | null | We calculate the topological susceptibility of the Yang-Mills vacuum using
the field correlator method. Our estimate for the SU(3) gauge group, \chi^{1/4}
= 196(7) MeV, is in a very good agreement with the results of recent numerical
simulations of the Yang-Mills theory on the lattice.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:18:55 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"Chernodub",
"M. N.",
""
],
[
"Kozlov",
"I. E.",
""
]
] |
0705.4625 | Carsten Schmitz | Carsten Schmitz | Hadronic Final States and Spectroscopy in ep Collisions at HERA | To appear in the proceedings of the 42nd Rencontres de Moriond
session devoted to QCD and hadronic interactions, La Thuile (Italy), March
17-24 2007 | null | null | null | hep-ex | null | Recent results on spectroscopy and the measurement of hadronic final states
in ep collisions from the H1 and ZEUS collaborations are presented using data
sets with an integrated luminosity between 44 and 121 pb^-1 collected during
the HERA I running period. Besides a search for resonant states which could be
interpreted as pentaquarks, a study of charged particle momentum spectra in the
Breit frame and a measurement of neutral strange hadron production is shown.
Furthermore two recent measurements of prompt photons are presented and
compared with pQCD calculations. The measurements are performed in
photoproduction with a four-momentum transfer squared Q^2\sim 0 GeV^2 or in
deep inelastic scattering at Q^2>1 GeV^2.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:12:46 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Schmitz",
"Carsten",
""
]
] |
0705.4626 | Rene Lozi | R. Lozi | New Enhanced Chaotic Number Generators | 42 pages, 17 figures, to be published in Proceeding 8th International
Conference of Indian Soc. of Indust. and Appl. Math., Jammu,India, 31st March
- 3rd April 2007, Invited conference | Indian Journal of Industrial and Applied Mathematics, Vol. 1,
Number 1, January-June 2007, pp. 1-23 | null | null | math.DS | null | We introduce new families of enhanced chaotic number generators in order to
compute very fast long series of pseudorandom numbers. The key feature of these
generators being the use of chaotic numbers themselves for sampling chaotic
subsequence of chaotic numbers in order to hide the generating function. We
explore numerically the properties of these new families and underline their
very high qualities and usefulness as CPRNG when series are computed up to 10
trillions iterations.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 14:58:13 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 20:41:35 GMT"
}
] | 2008-02-20T00:00:00 | [
[
"Lozi",
"R.",
""
]
] |
0705.4627 | John W. Norbury | Khin Maung Maung, John W. Norbury, Trina Coleman | Relativistic Multiple Scattering Theory and the Relativistic Impulse
Approximation | 20 pages, 9 figures, Accepted for publication in Journal of Physics G | J.Phys.G34:1861-1878,2007 | 10.1088/0954-3899/34/9/001 | null | nucl-th | null | It is shown that a relativistic multiple scattering theory for hadron-nucleus
scattering can be consistently formulated in four-dimensions in the context of
meson exchange. We give a multiple scattering series for the optical potential
and discuss the differences between the relativistic and non-relativistic
versions. We develop the relativistic multiple scattering series by separating
out the one boson exchange term from the rest of the Feynman series. However
this particular separation is not absolutely necessary and we discuss how to
include other terms. We then show how to make a three-dimensional reduction for
hadron-nucleus scattering calculations and we find that the relative energy
prescription used in the elastic scattering equation should be consistent with
the one used in the free two-body t-matrix involved in the optical potential.
We also discuss what assumptions are involved in making a Dirac Relativistic
Impulse Approximation (RIA).
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:09:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Maung",
"Khin Maung",
""
],
[
"Norbury",
"John W.",
""
],
[
"Coleman",
"Trina",
""
]
] |
0705.4628 | Hyeong-Chan Kim | Hyeong-Chan Kim, Chaiho Rim, and Jae Hyung Yee | Blackbody radiation in \kappa-Minkowski spacetime | 22pages, No figure, some corrections, to appear in Phys. Rev. D | Phys.Rev.D76:105012,2007 | 10.1103/PhysRevD.76.105012 | null | hep-th | null | We have computed the black body radiation spectra in $\kappa-$Minkowski
space-time, using the quantum mechanical picture of massless scalar particles
as well as effective quantum field theory picture. The black body radiation
depends on how the field theory (and thus how the $\kappa-$Poincar\'e algebra)
handles the ordering effect of the noncommutative space-time. In addition,
there exists a natural momentum cut-off of the order $\kappa$, beyond which a
new real mode takes its shape from a complex mode and the old real mode flows
out to be a new complex mode. However, the new high momentum real mode should
not be physical since its contributions to the black-body radiation spoils the
commutative limit.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:05:59 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Sep 2007 03:00:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"Hyeong-Chan",
""
],
[
"Rim",
"Chaiho",
""
],
[
"Yee",
"Jae Hyung",
""
]
] |
0705.4629 | Jan Balewski | STAR Collaboration: B. I. Abelev, et al | Measurement of Transverse Single-Spin Asymmetries for Di-Jet Production
in Proton-Proton Collisions at $\sqrt{s} = 200$ GeV | 6 pages total, 1 Latex file, 3 PS files with figures | Phys.Rev.Lett.99:142003,2007 | 10.1103/PhysRevLett.99.142003 | null | hep-ex | null | We report the first measurement of the opening angle distribution between
pairs of jets produced in high-energy collisions of transversely polarized
protons. The measurement probes (Sivers) correlations between the transverse
spin orientation of a proton and the transverse momentum directions of its
partons. With both beams polarized, the wide pseudorapidity ($-1 \leq \eta \leq
+2$) coverage for jets permits separation of Sivers functions for the valence
and sea regions. The resulting asymmetries are all consistent with zero and
considerably smaller than Sivers effects observed in semi-inclusive deep
inelastic scattering (SIDIS). We discuss theoretical attempts to reconcile the
new results with the sizable transverse spin effects seen in SIDIS and forward
hadron production in pp collisions.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:10:25 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 20:58:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"STAR Collaboration",
"",
""
],
[
"Abelev",
"B. I.",
""
]
] |
0705.4630 | Danielle Rojas-Rousse | Auguste Ndoutoume-Ndong, Danielle Rojas-Rousse (IRBII) | Y a-t-il \'elimination d'Eupelmus orientalis Crawford par Eupelmus
vuilleti Crawford (Hymenoptera : Eupelmidae) des syst\`emes de stockage du
ni\'eb\'e (Vigna unguiculata Walp) ? | null | Annales de la Soci\'et\'e Entomologique de France 43, 2
(01/06/2007) 139-144 | null | null | q-bio.PE | null | Ni\'eb\'e is a food leguminous plant cultivated in tropical Africa for its
seeds rich in proteins. The main problem setted by its production is the
conservation of harvests. In the fields as in the stocks, the seeds are
destroyed by pests (bruchids). These bruchids are always associated with
several entomophagous species of hymenoptera. Four entomophagous species were
listed : an egg parasitoid (U lariophaga Stephan), and three solitary larval
and pupal ectoparasitoids (D. Basalis Rondoni, Pteromalidae; E. vuilleti
Crawford and E. orientalis Crawford, Eupelmidae). The survey of the populations
shows that at the beginning of storage, E orientalis is the most abundant
specie (72 %) whereas E. vuilleti and D. Basalis respectively represent 12 %
and 16 % of the hymenoptera. During storage, the E orientalis population
decreases gradually and it disappears completely in less than two months after
the beginning of storage. E. Vuilleti population becomes gradually more
important than D. basalis population which regress until less than 10 % of the
emerging parasitoids. E vuilleti adopts ovicide and larvicide behaviour against
D. Basalis. This behaviour explains its population regression inside granaries.
If the aggressive behaviour of this Eupelmidae is a constant, that could also
explain the disappearance of E orientalis. However if this species is
maintained in stocks, it would be an effective control agent of bruchids
according to their parasitic capacities. This study shows that ovicide and
larvicide behaviour of E vuilleti is not expressed against E orientalis. When
the females have exclusively the hosts already parasitized by E orientalis,
they do not lay eggs. The disappearance of E orientalis could not thus be
explained by the presence of E. vuilleti.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:32:45 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Ndoutoume-Ndong",
"Auguste",
"",
"IRBII"
],
[
"Rojas-Rousse",
"Danielle",
"",
"IRBII"
]
] |
0705.4631 | Luca Pezz\'e | L. Pezze' and A. Smerzi | Mach-Zehnder Interferometry at the Heisenberg Limit with coherent and
squeezed-vacuum light | 4 pages, 4 figures | null | 10.1103/PhysRevLett.100.073601 | null | quant-ph cond-mat.other | null | We show that the phase sensitivity $\Delta \theta$ of a Mach-Zehnder
interferometer fed by a coherent state in one input port and squeezed-vacuum in
the other one is i) independent from the true value of the phase shift and ii)
can reach the Heisenberg limit $\Delta \theta \sim 1/N_T$, where $N_T$ is the
average number of particles of the input states. We also show that the
Cramer-Rao lower bound, $\Delta \theta \propto 1/ \sqrt{|\alpha|^2 e^{2r} +
\sinh^2r}$, can be saturated for arbitrary values of the squeezing parameter
$r$ and the amplitude of the coherent mode $|\alpha|$ by a Bayesian phase
inference protocol.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:33:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pezze'",
"L.",
""
],
[
"Smerzi",
"A.",
""
]
] |
0705.4632 | Declan Diver | Declan A. Diver and Luis F. A. Teodoro | Unplugging the Universe: the neglected electromagnetic consequence of
decoupling | 4 pages, no figures | Mon.Not.Roy.Astron.Soc.385:L73,2008 | 10.1111/j.1745-3933.2008.00436.x | null | astro-ph | null | This letter concentrates on the non-equilibrium evolution of magnetic field
structures at the onset of recombination, when the charged particle current
densities decay as neutrals are formed.
We consider the effect that a decaying magnetic flux has on the acceleration
of particles via the transient induced electric field. Since the residual
charged-particle number density is small as a result of decoupling, we shall
consider the magnetic and electric fields essentially to be imposed, neglecting
the feedback from any minority accelerated population.
We find that the electromagnetic treatment of this phase transition can
produce energetic electrons scattered throughout the Universe. Such particles
could have a significant effect on cosmic evolution in several ways: (i) their
presence could delay the effective end of the recombination era; (ii) they
could give rise to plasma concentrations that could enhance early gravitational
collapse of matter by opposing cosmic expansion to a greater degree than
neutral matter could; (iii) they could continue to be accelerated, and become
the seed for reionisation at the later epoch $z \approx 10$.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:43:50 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 16:26:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Diver",
"Declan A.",
""
],
[
"Teodoro",
"Luis F. A.",
""
]
] |
0705.4633 | Carlo Nipoti | Carlo Nipoti (1), Pasquale Londrillo (2), Luca Ciotti (1) ((1) Bologna
University, (2) INAF Bologna Astronomical Observatory) | Galaxy merging in MOND | 5 pages, 2 color figures. To appear in MNRAS Letters. Added
references and discussion, conclusions unchanged | null | 10.1111/j.1745-3933.2007.00378.x | null | astro-ph | null | We present the results of N-body simulations of dissipationless galaxy
merging in Modified Newtonian Dynamics (MOND). For comparison, we also studied
Newtonian merging between galaxies embedded in dark matter halos, with internal
dynamics equivalent to the MOND systems. We found that the merging timescales
are significantly longer in MOND than in Newtonian gravity with dark matter,
suggesting that observational evidence of rapid merging could be difficult to
explain in MOND. However, when two galaxies eventually merge, the MOND merging
end-product is hardly distinguishable from the final stellar distribution of an
equivalent Newtonian merger with dark matter.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:59:26 GMT"
},
{
"version": "v2",
"created": "Tue, 28 Aug 2007 13:27:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nipoti",
"Carlo",
""
],
[
"Londrillo",
"Pasquale",
""
],
[
"Ciotti",
"Luca",
""
]
] |
0705.4634 | Carlo Piermarocchi | Diego Calzolari, Giovanni Paternostro, Patrick L. Harrington Jr.,
Carlo Piermarocchi, and Phillip M. Duxbury | Selective control of the apoptosis signaling network in heterogeneous
cell populations | 14 pages, 16 figures. Accepted for publication in PLoS ONE | PLoS ONE 2(6): e547 (2007) | 10.1371/journal.pone.0000547 | null | q-bio.QM cond-mat.stat-mech | null | Selective control in a population is the ability to control a member of the
population while leaving the other members relatively unaffected. The concept
of selective control is developed using cell death or apoptosis in
heterogeneous cell populations as an example. Apoptosis signaling in
heterogeneous cells is described by an ensemble of gene networks with identical
topology but different link strengths. Selective control depends on the
statistics of signaling in the ensemble of networks and we analyse the effects
of superposition, non-linearity and feedback on these statistics. Parallel
pathways promote normal statistics while series pathways promote skew
distributions which in the most extreme cases become log-normal. We also show
that feedback and non-linearity can produce bimodal signaling statistics, as
can discreteness and non-linearity. Two methods for optimizing selective
control are presented. The first is an exhaustive search method and the second
is a linear programming based approach. Though control of a single gene in the
signaling network yields little selectivity, control of a few genes typically
yields higher levels of selectivity. The statistics of gene combinations
susceptible to selective control is studied and is used to identify general
control strategies. We found that selectivity is promoted by acting on the
least sensitive nodes in the case of weak populations, while selective control
of robust populations is optimized through perturbations of more sensitive
nodes. High throughput experiments with heterogeneous cell lines could be
designed in an analogous manner, with the further possibility of incorporating
the selectivity optimization process into a closed-loop control system.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:51:56 GMT"
}
] | 2014-07-29T00:00:00 | [
[
"Calzolari",
"Diego",
""
],
[
"Paternostro",
"Giovanni",
""
],
[
"Harrington",
"Patrick L.",
"Jr."
],
[
"Piermarocchi",
"Carlo",
""
],
[
"Duxbury",
"Phillip M.",
""
]
] |
0705.4635 | Thierry Emonet | Thierry Emonet and Philippe Cluzel | Relationship between cellular response and behavioral variability in
bacterial chemotaxis | 15 pages, 4 figures, Supporting information available here
http://cluzel.uchicago.edu/data/emonet/arxiv_070531_supp.pdf | null | 10.1073/pnas.0705463105 | null | q-bio.MN q-bio.CB q-bio.OT | null | Bacterial chemotaxis in Escherichia coli is a canonical system for the study
of signal transduction. A remarkable feature of this system is the coexistence
of precise adaptation in population with large fluctuating cellular behavior in
single cells (Korobkova et al. 2004, Nature, 428, 574). Using a stochastic
model, we found that the large behavioral variability experimentally observed
in non-stimulated cells is a direct consequence of the architecture of this
adaptive system. Reversible covalent modification cycles, in which methylation
and demethylation reactions antagonistically regulate the activity of
receptor-kinase complexes, operate outside the region of first-order kinetics.
As a result, the receptor-kinase that governs cellular behavior exhibits a
sigmoidal activation curve. This curve simultaneously amplifies the inherent
stochastic fluctuations in the system and lengthens the relaxation time in
response to stimulus. Because stochastic fluctuations cause large behavioral
variability and the relaxation time governs the average duration of runs in
response to small stimuli, cells with the greatest fluctuating behavior also
display the largest chemotactic response. Finally, Large-scale simulations of
digital bacteria suggest that the chemotaxis network is tuned to simultaneously
optimize the random spread of cells in absence of nutrients and the cellular
response to gradients of attractant.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:05:09 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Emonet",
"Thierry",
""
],
[
"Cluzel",
"Philippe",
""
]
] |
0705.4636 | Paul Evans | Paul G. Evans, Eric D. Isaacs, Gabriel Aeppli, Zhonghou Cai, and Barry
Lai | X-ray Microdiffraction Images of Antiferromagnetic Domain Evolution in
Chromium | null | P. G. Evans, E. D. Isaacs, G. Aeppli, Z. Cai, and B. Lai, Science
295, 1042 (2002) | 10.1126/science.1066870 | null | cond-mat.other | null | Magnetic x-ray diffraction combined with x-ray focusing optics is used to
image individual antiferromagnetic spin density wave domains in a chromium
single crystal at the micron scale. The cross section for non-resonant magnetic
x-ray scattering depends on the antiferromagnetic modulation vector and spin
polarization direction and allows these quantities to be extracted
independently. The technique is used to show that the broadening of the
nominally first order "spin-flip" transition at 123 K, at which the spins
rotate by 90 deg., originates at the walls between domains with orthogonal
modulation vectors. During cooling the transition begins at these walls and
progresses inwards. The modulation-vector domains are themselves unchanged.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 15:55:04 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Evans",
"Paul G.",
""
],
[
"Isaacs",
"Eric D.",
""
],
[
"Aeppli",
"Gabriel",
""
],
[
"Cai",
"Zhonghou",
""
],
[
"Lai",
"Barry",
""
]
] |
0705.4637 | Maurits Haverkort | M. W. Haverkort, A. Tanaka, L. H. Tjeng, and G. A. Sawatzky | Non-resonant inelastic x-ray scattering involving excitonic excitations | null | Phys. Rev. Lett. 99, 257401 (2007) | 10.1103/PhysRevLett.99.257401 | null | cond-mat.str-el | null | In a recent publication Larson \textit{et al.} reported remarkably clear
$d$-$d$ excitations for NiO and CoO measured with x-ray energies well below the
transition metal $K$ edge. In this letter we demonstrate that we can obtain an
accurate quantitative description based on a local many body approach. We find
that the magnitude of $\vec{q}$ can be tuned for maximum sensitivity for
dipole, quadrupole, etc. excitations. We also find that the direction of
$\vec{q}$ with respect to the crystal axes can be used as an equivalent to
polarization similar to electron energy loss spectroscopy, allowing for a
determination of the local symmetry of the initial and final state based on
selection rules. This method is more generally applicable and combined with the
high resolution available, could be a powerful tool for the study of local
distortions and symmetries in transition metal compounds including also buried
interfaces.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:00:47 GMT"
}
] | 2008-01-09T00:00:00 | [
[
"Haverkort",
"M. W.",
""
],
[
"Tanaka",
"A.",
""
],
[
"Tjeng",
"L. H.",
""
],
[
"Sawatzky",
"G. A.",
""
]
] |
0705.4638 | H. D. Zeh | H. D. Zeh | Time in Quantum Theory | 6 pages pdf - entry for a forthcoming "Compendium of Quantum
Physics". Version 2: minor revisions | null | null | null | quant-ph | null | The concept of time as used in various applications and interpretations of
quantum theory is briefly reviewed.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:03:50 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Sep 2007 18:44:00 GMT"
}
] | 2007-09-06T00:00:00 | [
[
"Zeh",
"H. D.",
""
]
] |
0705.4639 | Roger Fenn Dr | Andrew Bartholomew, Roger Fenn, Naoko Kamada, Seiichi Kamada | New Invariants of Long Virtual Knots | 14 pages 11 figures | null | null | null | math.GT math.RA | null | This paper extends the construction of invariants for virtual knots to
virtual long knots and introduces two new invariant modules of virtual long
knots. Several interesting features are described that distinguish virtual long
knots from their classical counterparts with respect to their symmetries and
the concatenation product.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:06:39 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Bartholomew",
"Andrew",
""
],
[
"Fenn",
"Roger",
""
],
[
"Kamada",
"Naoko",
""
],
[
"Kamada",
"Seiichi",
""
]
] |
0705.4640 | Jordan Bell | Leonhard Euler | On the values of integrals with the variable taken from $x=0$ to
$x=\infty$ | 7 pages; minor changes | null | null | null | math.HO math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a translation from the Latin original, "De valoribus integralium a
termino variabilis x=0 usque ad x=infinity extensorum" (1781). This is E675 in
the Enestrom index. Euler wants to find the location of the end point of a
clothoid, a type of spiral. He proves some general results about the gamma
function.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:08:33 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Aug 2008 22:14:13 GMT"
}
] | 2009-04-16T00:00:00 | [
[
"Euler",
"Leonhard",
""
]
] |
0705.4641 | Rohta Takahashi | Rohta Takahashi | Equations of general relativistic radiation hydrodynamics in Kerr
space-time | Accepted for publication in the Monthly Notices of the Royal
Astronomical Society | null | 10.1111/j.1365-2966.2007.12030.x | null | astro-ph | null | Equations of fully general relativistic radiation hydrodynamics in Kerr
space-time are derived. While the interactions between matter and radiation are
introduced in the comoving frame, the derivatives used when describing the
global evolutions of both the matter and the radiation are given in the
Boyer-Lindquist frame (BLF) which is a frame fixed to the coordinate describing
the central black hole. Around a rotating black hole, both the matter and the
radiation are influenced by the frame-dragging effects due to the black hole's
rotation. As a fixed frame, we use the locally non-rotating reference frame
(LNRF) which is one of the orthonormal frame. While the special relativistic
effects such as beaming effects are introduced by the Lorentz transformation
connecting the comoving frame and the LNRF, the general relativistic effects
such as frame-dragging and gravitational redshift are introduced by the tetrads
connecting the LNRF and the BLF.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:20:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Takahashi",
"Rohta",
""
]
] |
0705.4642 | Simon F. Ross | Donald Marolf and Simon F. Ross | Reversing Renormalization-Group Flows with AdS/CFT | 11 pages, 1 figure | JHEP 0805:055,2008 | 10.1088/1126-6708/2008/05/055 | DCPT-07/27 | hep-th | null | For scalar fields in AdS with masses slightly above the
Breitenlohner-Freedman bound, appropriate non-local boundary conditions can
define a unitary theory. Such boundary conditions correspond to non-local
deformations of the dual CFT, and generate a non-local renormalization-group
flow. Nevertheless, a bulk analysis suggests that certain such flows lead to
local CFTs in the infra-red. Since the flows are non-local, they can either
increase or decrease the central charge of the CFT. In fact, given any local
renormalization-group flow within a certain general class which leads from a UV
theory (CFT_1) to an IR theory (CFT_2), we show that one can find such a
non-local flow in which the endpoints are interchanged: the non-local theory
flows from CFT_2 in the IR to CFT_1 in the UV. We work at large N, but the
flows we consider involve quantum field effects in the bulk, corresponding to
1/N corrections in the dual theory.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:24:51 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Marolf",
"Donald",
""
],
[
"Ross",
"Simon F.",
""
]
] |
0705.4643 | Arend Jan Poelarends | A.J.T. Poelarends, F. Herwig, N. Langer, A. Heger | The Supernova Channel of Super-AGB Stars | 13 pages, 16 figures, submitted to ApJ, uses emulateapj | null | 10.1086/520872 | LA-UR-07-0434 | astro-ph | null | We study the late evolution of solar metallicity stars in the transition
region between white dwarf formation and core collapse. This includes the
super-asymptotic giant branch (super-AGB, SAGB) stars, which have massive
enough cores to ignite carbon burning and form an oxygen-neon (ONe) core. The
most massive SAGB stars have cores that may grow to the Chandrasekhar mass
because of continued shell-burning. Their cores collapse, triggering a so
called electron capture supernovae (ECSN). From stellar evolution models we
find that the initial mass range for SAGB evolution is 7.5 ... 9.25\msun. We
perform calculations with three different stellar evolution codes to
investigate the sensitivity of this mass range to some of the uncertainties in
current stellar models. The mass range significantly depends on the treatment
of semiconvective mixing and convective overshooting. To consider the effect of
a large number of thermal pulses, as expected in SAGB stars, we construct
synthetic SAGB models that include a semi-analytical treatment of dredge-up,
hot-bottom burning, and thermal pulse properties. This synthetic model enables
us to compute the evolution of the main properties of SAGB stars from the onset
of thermal pulses until the core reaches the Chandrasekhar mass or is uncovered
by the stellar wind. Thereby, we determine the stellar initial mass ranges that
produce ONe-white dwarfs and electron-capture supernovae. The latter is found
to be 9.0 ... 9.25\msun for our fiducial model, implying that electron-capture
supernovae would constitute about 4% of all supernovae in the local universe.
Our synthetic approach allows us to explore the uncertainty of this number
imposed by uncertainties in the third dredge-up efficiency and ABG mass loss
rate. We find for ECSNe a upper limit of ~20% of all supernovae (abridged).
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:42:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Poelarends",
"A. J. T.",
""
],
[
"Herwig",
"F.",
""
],
[
"Langer",
"N.",
""
],
[
"Heger",
"A.",
""
]
] |
0705.4644 | Laur J\"arv | Laur Jarv, Piret Kuusk, Margus Saal | Scalar-tensor cosmology at the general relativity limit: Jordan vs
Einstein frame | 16 pages, 8 figures, version appeared in PRD | Phys.Rev.D76:103506,2007 | 10.1103/PhysRevD.76.103506 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the correspondence between the Jordan frame and the Einstein
frame descriptions of scalar-tensor theory of gravitation. We argue that since
the redefinition of the scalar field is not differentiable at the limit of
general relativity the correspondence between the two frames is lost at this
limit. To clarify the situation we analyse the dynamics of the scalar field in
different frames for two distinct scalar-tensor cosmologies with specific
coupling functions and demonstrate that the corresponding scalar field phase
portraits are not equivalent for regions containing the general relativity
limit. Therefore the answer to the question whether general relativity is an
attractor for the theory depends on the choice of the frame.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:55:29 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Jul 2008 15:09:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jarv",
"Laur",
""
],
[
"Kuusk",
"Piret",
""
],
[
"Saal",
"Margus",
""
]
] |
0705.4645 | Manjari Bagchi | Manjari Bagchi, Jishnu Dey, Mira Dey, Taparati Gangopadhyay, Sibasish
Laha, Subharthi Ray, Monika Sinha | Bound for entropy and viscosity ratio for strange quark matter | 10 pages, 2 figures, 1 table; Accepted for publication in Phys. Lett.
B | Phys.Lett.B666:145-149,2008 | 10.1016/j.physletb.2008.07.008 | null | astro-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High energy density ($\eps$) and temperature (T) links general relativity and
hydrodynamics leading to a lower bound for the ratio of shear viscosity
($\eta$) and entropy density ($s$). We get the interesting result that the
bound is saturated in the simple model for quark matter that we use for strange
stars at the surface for $T \sim 80 MeV$. At this $T$ we have the possibility
of cosmic separation of phases. At the surface of the star where the pressure
is zero - the density $\eps$ has a fixed value for all stars of various masses
with correspondingly varying central energy density $\eps_c$. Inside the star
where this density is higher, the ratio of $\eta/s$ is larger and are like the
known results found for perturbative QCD. This serves as a check of our
calculation. The deconfined quarks at the surface of the strange star at $T =
80 MeV$ seem to constitute the most perfect interacting fluid permitted by
nature.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:36:10 GMT"
},
{
"version": "v2",
"created": "Sun, 11 Nov 2007 05:08:35 GMT"
},
{
"version": "v3",
"created": "Thu, 3 Jul 2008 08:24:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bagchi",
"Manjari",
""
],
[
"Dey",
"Jishnu",
""
],
[
"Dey",
"Mira",
""
],
[
"Gangopadhyay",
"Taparati",
""
],
[
"Laha",
"Sibasish",
""
],
[
"Ray",
"Subharthi",
""
],
[
"Sinha",
"Monika",
""
]
] |
0705.4646 | Fernando Peruani | Fernando Peruani and Luis G. Morelli | Self-propelled particles with fluctuating speed and direction of motion | to appear in Phys. Rev. Lett | Phys. Rev. Lett. 99, 010602 (2007) | 10.1103/PhysRevLett.99.010602 | null | physics.bio-ph physics.gen-ph | null | We study general aspects of active motion with fluctuations in the speed and
the direction of motion in two dimensions. We consider the case in which
fluctuations in the speed are not correlated to fluctuations in the direction
of motion, and assume that both processes can be described by independent
characteristic time-scales. We show the occurrence of a complex transient that
can exhibit a series of alternating regimes of motion, for two different
angular dynamics which correspond to persistent and directed random walks. We
also show additive corrections to the diffusion coefficient. The characteristic
time-scales are also exposed in the velocity autocorrelation, which is a sum of
exponential forms.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:36:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Peruani",
"Fernando",
""
],
[
"Morelli",
"Luis G.",
""
]
] |
0705.4647 | Chuanwei Zhang | Chuanwei Zhang, Sumanta Tewari, S. Das Sarma | Bell's inequality and universal quantum gates in a cold atom chiral
fermionic p-wave superfluid | 4+ pages, 3 figures, display problems of figures in previous version
are corrected, accepted for publication in PRL | Phys. Rev. Lett., 99, 220502 (2007) | 10.1103/PhysRevLett.99.220502 | null | quant-ph cond-mat.str-el | null | We propose and analyze a probabilistic scheme to entangle two spatially
separated topological qubits in a $p_{x}+ip_{y}$ superfluid using controlled
collisions between atoms in movable dipole traps and unpaired atoms inside
vortex cores in the superfluid. We discuss how to test the violation of Bell's
inequality with the generated entanglement. A set of universal quantum gates is
shown to be implementable \textit{deterministically} using the entanglement
despite the fact that the entangled states can only be created
probabilistically.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:59:12 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 16:06:06 GMT"
},
{
"version": "v3",
"created": "Thu, 25 Oct 2007 01:44:42 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Zhang",
"Chuanwei",
""
],
[
"Tewari",
"Sumanta",
""
],
[
"Sarma",
"S. Das",
""
]
] |
0705.4648 | Frank Krauss | Tanju Gleisberg, Stefan Hoeche, Frank Krauss, Radoslaw Matyszkiewicz,
Marek Schoenherr, Steffen Schumann, Frank Siegert, Jan Winter | New trends in modern event generators | 4 pages, talk given by Frank Krauss at Moriond 2007, QCD session | null | null | null | hep-ph | null | Some features of modern simulation tools for high-energy physics are
reviewed.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:21:49 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Gleisberg",
"Tanju",
""
],
[
"Hoeche",
"Stefan",
""
],
[
"Krauss",
"Frank",
""
],
[
"Matyszkiewicz",
"Radoslaw",
""
],
[
"Schoenherr",
"Marek",
""
],
[
"Schumann",
"Steffen",
""
],
[
"Siegert",
"Frank",
""
],
[
"Winter",
"Jan",
""
]
] |
0705.4649 | Viet-Anh Nguyen | Peter Pflug and Viet-Anh Nguyen | Boundary cross theorem in dimension 1 with singularities | Preprint of the ICTP, Trieste-Italy (2007). 18 pages | null | null | null | math.CV | null | Let $D$ and $G$ be copies of the open unit disc in $\C,$ let
$A$ (resp. $B$) be a measurable subset of $\partial D$ (resp.
$\partial G$), let $W$ be the 2-fold cross $\big((D\cup A)\times B\big)\cup
\big(A\times(B\cup G)\big),$ and let $M$ be a relatively closed subset of $W.$
Suppose in addition that $A$ and $B$ are of positive one-dimensional Lebesgue
measure and that $M$ is fiberwise polar (resp. fiberwise discrete) and that
$M\cap (A\times B)=\varnothing.$ We determine the "envelope of holomorphy"
$\hat{W\setminus M}$ of $W\setminus M$ in the sense that any function locally
bounded on $W\setminus M,$ measurable on $A\times B,$ and separately
holomorphic on $\big((A\times G) \cup (D\times B)\big)\setminus M$ "extends" to
a function holomorphic on $\hat{W\setminus M}.$
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:49:04 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Pflug",
"Peter",
""
],
[
"Nguyen",
"Viet-Anh",
""
]
] |
0705.4650 | Julien Niset Mr | J. Niset and N. J. Cerf | Tight bounds on the concurrence of quantum superpositions | 7 pages, 2 figures | Phys. Rev. A 76, 042328 (2007) | 10.1103/PhysRevA.76.042328 | null | quant-ph | null | The entanglement content of superpositions of quantum states is investigated
based on a measure called {\it concurrence}. Given a bipartite pure state in
arbitrary dimension written as the quantum superposition of two other such
states, we find simple inequalities relating the concurrence of the state to
that of its components. We derive an exact expression for the concurrence when
the component states are biorthogonal, and provide elegant upper and lower
bounds in all other cases. For quantum bits, our upper bound is tighter than
the previously derived bound in [Phys. Rev. Lett. 97, 100502 (2006).]
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:50:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Niset",
"J.",
""
],
[
"Cerf",
"N. J.",
""
]
] |
0705.4651 | Marco Spaans | M. Spaans and R. Meijerink | CO+ in M 82: A Consequence of Irradiation by X-rays | added discussion on more recent X-ray observations | null | 10.1086/520535 | null | astro-ph | null | Based on its strong CO+ emission it is argued that the M 82 star-burst galaxy
is exposed to a combination of FUV and X-ray radiation. The latter is likely to
be the result of the star-burst superwind, which leads to diffuse thermal
emission at ~0.7 keV, and a compact hard, 2-10 keV, source (but not an AGN).
Although a photon-dominated region (FUV) component is clearly present in the
nucleus of M 82, and capable of forming CO+, only X-ray irradiated gas of
density 10^3-10^5 cm^-3 can reproduce the large, ~(1-4)x10^13 cm^-2, columns of
CO+ that are observed toward the proto-typical star-burst M 82. The total X-ray
luminosity produced by M 82 is weak, ~10^41 erg s^-1, but this is sufficient to
drive the formation of CO+.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:50:54 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Jun 2007 07:13:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Spaans",
"M.",
""
],
[
"Meijerink",
"R.",
""
]
] |
0705.4652 | Gil Jannes | Carlos Barcelo, Gil Jannes | A real Lorentz-FitzGerald contraction | 6 pages, no figures. Minor changes reflect published version | Found.Phys.38:191-199,2008 | 10.1007/s10701-007-9196-7 | null | gr-qc cond-mat.other | null | Many condensed matter systems are such that their collective excitations at
low energies can be described by fields satisfying equations of motion formally
indistinguishable from those of relativistic field theory. The finite speed of
propagation of the disturbances in the effective fields (in the simplest
models, the speed of sound) plays here the role of the speed of light in
fundamental physics. However, these apparently relativistic fields are immersed
in an external Newtonian world (the condensed matter system itself and the
laboratory can be considered Newtonian, since all the velocities involved are
much smaller than the velocity of light) which provides a privileged coordinate
system and therefore seems to destroy the possibility of having a perfectly
defined relativistic emergent world. In this essay we ask ourselves the
following question: In a homogeneous condensed matter medium, is there a way
for internal observers, dealing exclusively with the low-energy collective
phenomena, to detect their state of uniform motion with respect to the medium?
By proposing a thought experiment based on the construction of a
Michelson-Morley interferometer made of quasi-particles, we show that a real
Lorentz-FitzGerald contraction takes place, so that internal observers are
unable to find out anything about their `absolute ' state of motion. Therefore,
we also show that an effective but perfectly defined relativistic world can
emerge in a fishbowl world situated inside a Newtonian (laboratory) system.
This leads us to reflect on the various levels of description in physics, in
particular regarding the quest towards a theory of quantum gravity.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:52:04 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 17:01:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Barcelo",
"Carlos",
""
],
[
"Jannes",
"Gil",
""
]
] |
0705.4653 | Adam Falkowski | Adam Falkowski, Stefan Pokorski, J. P. Roberts | Modelling strong interactions and longitudinally polarized vector boson
scattering | 30 pages, no figures | JHEP 0712:063,2007 | 10.1088/1126-6708/2007/12/063 | null | hep-ph | null | We study scattering of the electroweak gauge bosons in 5D warped models.
Within two different models we determine the precise manner in which the Higgs
boson and the vector resonances ensure the unitarity of longitudinal vector
boson scattering. We identify three separate scales that determine the dynamics
of the scattering process in all cases. For a quite general background geometry
of 5D, these scales can be linked to a simple functional of the warp factor.
The models smoothly interpolate between a `composite' Higgs limit and a
Higgsless limit. By holographic arguments, these models provide an effective
description of vector boson scattering in 4D models with a strongly coupled
electroweak breaking sector.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 16:54:21 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 10:36:20 GMT"
}
] | 2009-04-21T00:00:00 | [
[
"Falkowski",
"Adam",
""
],
[
"Pokorski",
"Stefan",
""
],
[
"Roberts",
"J. P.",
""
]
] |
0705.4654 | Donald Sofge | Peter F. Lichtenwalner and Donald A. Sofge | Local Area Damage Detection in Composite Structures Using Piezoelectric
Transducers | 7 pages | P.F. Lichtenwalner and D. Sofge, "Local Area Damage Detection in
Composite Structures Using Piezoelectric Transducers," In Proc. SPIE Sym. on
Smart Structures and Materials, Vol. 3326, SPIE, pp. 509-515, 1998 | 10.1117/12.310667 | null | cs.SD cs.CV | null | An integrated and automated smart structures approach for structural health
monitoring is presented, utilizing an array of piezoelectric transducers
attached to or embedded within the structure for both actuation and sensing.
The system actively interrogates the structure via broadband excitation of
multiple actuators across a desired frequency range. The structure's vibration
signature is then characterized by computing the transfer functions between
each actuator/sensor pair, and compared to the baseline signature. Experimental
results applying the system to local area damage detection in a MD Explorer
rotorcraft composite flexbeam are presented.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:19:17 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Lichtenwalner",
"Peter F.",
""
],
[
"Sofge",
"Donald A.",
""
]
] |
0705.4655 | Tobias Raufer | Tobias M. Raufer | MINOS Results, Progress and Future Prospects | 8 pages, 7 figures, prepared for the proceedings of the XLIInd
Rencontres de Moriond, Electroweak Interactions and Unified Theories, La
Thuile, March 2007 | null | null | FERMILAB-CONF-07-149-E | hep-ex | null | The MINOS long baseline experiment has been collecting neutrino beam data
since March 2005 and has accumulated 3 x 10^{20} protons-on-target (POT) to
date. MINOS uses Fermilab's NuMI neutrino beam which is measured by two
steel-scintillator tracking calorimeters, one at Fermilab and the other 735 km
downstream, in northern Minnesota. By observing the oscillatory structure in
the neutrino energy spectrum, MINOS can precisely measure the neutrino
oscillation parameters in the atmospheric sector. From analysis of the first
year of data, corresponding to 1.27 x 10^{20} POT, these parameters were
determined to be |\Delta m^2_{32}|=2.74^{+0.44}_{-0.26} x 10^{-3} eV^2 and
sin^2(2\theta_{23})>0.87 (68% C.L.). MINOS is able to measure the neutrino
velocity by comparing the arrival times of the neutrino beam in its two
detectors. Using a total of 473 Far Detector events, (v-c)/c = (5.1 +/- 2.9) x
10^{-5} (68% C.L.) was measured. In addition, we report recent progress in the
analysis of neutral current events and give an outline of experimental goals
for the future.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:22:10 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Raufer",
"Tobias M.",
""
]
] |
0705.4656 | Frederic P. Schuller | Frederic P. Schuller, Mattias N. R. Wohlfarth | Radiation-dominated area metric cosmology | 23 pages, no figures; references added | JCAP 0712:013,2007 | 10.1088/1475-7516/2007/12/013 | null | hep-th | null | We provide further crucial support for a refined, area metric structure of
spacetime. Based on the solution of conceptual issues, such as the consistent
coupling of fermions and the covariant identification of radiation fields on
area metric backgrounds, we show that the radiation-dominated epoch of area
metric cosmology is equivalent to that epoch in standard Einstein cosmology.
This ensures, in particular, successful nucleosynthesis. This surprising result
complements the previously derived prediction of a small late-time acceleration
of an area metric universe.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:25:58 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2007 21:07:36 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Schuller",
"Frederic P.",
""
],
[
"Wohlfarth",
"Mattias N. R.",
""
]
] |
0705.4657 | Andre LeClair | Andr\'e LeClair and Matthias Neubert | Semi-Lorentz invariance, unitarity, and critical exponents of symplectic
fermion models | v2: Published version, minor typose corrected | JHEP 0710:027,2007 | 10.1088/1126-6708/2007/10/027 | null | hep-th cond-mat.str-el hep-ph math-ph math.MP | null | We study a model of N-component complex fermions with a kinetic term that is
second order in derivatives. This symplectic fermion model has an Sp(2N)
symmetry, which for any N contains an SO(3) subgroup that can be identified
with rotational spin of spin-1/2 particles. Since the spin-1/2 representation
is not promoted to a representation of the Lorentz group, the model is not
fully Lorentz invariant, although it has a relativistic dispersion relation.
The hamiltonian is pseudo-hermitian, H^\dagger = C H C, which implies it has a
unitary time evolution. Renormalization-group analysis shows the model has a
low-energy fixed point that is a fermionic version of the Wilson-Fisher fixed
points. The critical exponents are computed to two-loop order. Possible
applications to condensed matter physics in 3 space-time dimensions are
discussed.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:24:12 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 20:53:19 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"LeClair",
"André",
""
],
[
"Neubert",
"Matthias",
""
]
] |
0705.4658 | Marius Zimand | Marius Zimand | Two sources are better than one for increasing the Kolmogorov complexity
of infinite sequences | Theorem 4.15 replaced with a weaker version; several other minor
changes | null | null | null | cs.IT cs.CC math.IT | null | The randomness rate of an infinite binary sequence is characterized by the
sequence of ratios between the Kolmogorov complexity and the length of the
initial segments of the sequence. It is known that there is no uniform
effective procedure that transforms one input sequence into another sequence
with higher randomness rate. By contrast, we display such a uniform effective
procedure having as input two independent sequences with positive but
arbitrarily small constant randomness rate. Moreover the transformation is a
truth-table reduction and the output has randomness rate arbitrarily close to
1.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:38:04 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Dec 2007 14:12:28 GMT"
}
] | 2007-12-11T00:00:00 | [
[
"Zimand",
"Marius",
""
]
] |
0705.4659 | Bohdan Andraka | M. E. McBriarty, P. Kumar, G.R. Stewart, and B. Andraka | On the nature of two superconducting transitions in the specific heat of
PrOs$_4$Sb$_{12}$: Effects of crystal grinding | null | null | null | null | cond-mat.supr-con cond-mat.str-el | null | Specific heat, dc- and ac-magnetic susceptibility are reported for a large
single crystal of PrOs$_4$Sb$_{12}$ and, after grinding, its powder. The room
temperature effective paramagnetic moment of the crystal was consistent with
the Pr$^{3+}$ ionic configuration and full occupancy of the Pr-sublattice. The
crystal showed two distinct anomalies in the specific heat and an overall
discontinuity in $C/T$ of more than 1000 mJ/K$^2$mol. The upper transition (at
$T_{c1}$) was rounded, in an agreement with previous reports. The anomaly at
$T_{c2}$ was very sharp, consistent with a good quality of the crystal. We
observed a shoulder in $\chi$' and two peaks in $\chi$'' below $T_{c1}$.
However, there were no signatures in $\chi$' of the lower temperature
transition. PrOs$_4$Sb$_{12}$ is extremely sensitive to grinding, which
suppresses the upper superconducting transition in both the specific heat and
magnetic susceptibility. $\Delta C/T_{c}$ was reduced to 140 mJ/K$^2$ mol in
the powdered sample. Existing data on ground, polished, and sliced crystals
suggests the existence of a length scale of order 100 $\mu$, characterizing the
higher temperature superconducting phase.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 19:35:17 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"McBriarty",
"M. E.",
""
],
[
"Kumar",
"P.",
""
],
[
"Stewart",
"G. R.",
""
],
[
"Andraka",
"B.",
""
]
] |
0705.4660 | Georg von Hippel | Zh. Hao, G. M. von Hippel, R. R. Horgan, Q. J. Mason, H. D. Trottier
(HPQCD collaboration) | Unquenching effects on the coefficients of the L\"uscher-Weisz action | 7 pages, 5 figures, uses revtex4; version to appear in Phys.Rev.D | Phys.Rev.D76:034507,2007 | 10.1103/PhysRevD.76.034507 | DAMTP-2006-124 | hep-lat | null | The effects of unquenching on the perturbative improvement coefficients in
the Symanzik action are computed within the framework of L\"uscher-Weisz
on-shell improvement. We find that the effects of quark loops are surprisingly
large, and their omission may well explain the scaling violations observed in
some unquenched studies.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:32:08 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 15:22:38 GMT"
},
{
"version": "v3",
"created": "Fri, 22 Jun 2007 21:08:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hao",
"Zh.",
"",
"HPQCD collaboration"
],
[
"von Hippel",
"G. M.",
"",
"HPQCD collaboration"
],
[
"Horgan",
"R. R.",
"",
"HPQCD collaboration"
],
[
"Mason",
"Q. J.",
"",
"HPQCD collaboration"
],
[
"Trottier",
"H. D.",
"",
"HPQCD collaboration"
]
] |
0705.4661 | James D. Lewis | James D. Lewis, Shuji Saito | Algebraic Cycles and Mumford-Griffiths Invariants | 39 pages, To appear in the American Journal of Mathematics | null | null | null | math.AG | null | Let $X$ be a projective algebraic manifold and let $CH^r(X)$ be the Chow
group of algebraic cycles of codimension $r$ on $X$, modulo rational
equivalence. Working with a candidate Bloch-Beilinson filtration
$\{F^{\nu}\}_{\nu\geq 0}$ on $CH^r(X)\otimes {\Bbb Q}$ due to the second
author, we construct a space of arithmetic Hodge theoretic invariants $\nabla
J^{r,\nu}(X)$ and corresponding map $\phi_{X}^{r,\nu} :
Gr_{F}^{\nu}CH^r(X)\otimes {\Bbb Q} \to \nabla J^{r,\nu}(X)$, and determine
conditions on $X$ for which the kernel and image of $\phi_{X}^{r,\nu}$ are
``uncountably large''.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:36:08 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Lewis",
"James D.",
""
],
[
"Saito",
"Shuji",
""
]
] |
0705.4662 | Assaf Naor | Tim Austin, Assaf Naor, Alain Valette | The Euclidean distortion of the lamplighter group | null | null | null | null | math.MG math.FA math.GR | null | We show that the cyclic lamplighter group $C_2 \bwr C_n$ embeds into Hilbert
space with distortion ${\rm O}(\sqrt{\log n})$. This matches the lower bound
proved by Lee, Naor and Peres in \cite{LeeNaoPer}, answering a question posed
in that paper. Thus the Euclidean distortion of $C_2 \bwr C_n$ is
$\Theta(\sqrt{\log n})$. Our embedding is constructed explicitly in terms of
the irreducible representations of the group. Since the optimal Euclidean
embedding of a finite group can always be chosen to be equivariant, as shown by
Aharoni, Maurey and Mityagin \cite{AhaMauMit} and by Gromov (see
\cite{deCTesVal}), such representation-theoretic considerations suggest a
general tool for obtaining upper and lower bounds on Euclidean embeddings of
finite groups.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:38:11 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Austin",
"Tim",
""
],
[
"Naor",
"Assaf",
""
],
[
"Valette",
"Alain",
""
]
] |
0705.4663 | Leonid Levitov | A. V. Shytov, M. I. Katsnelson, L. S. Levitov | Vacuum Polarization and Screening of Supercritical Impurities in
Graphene | 5 pages, 2 figures | Phys. Rev. Lett. 99, 236801 (2007) | 10.1103/PhysRevLett.99.236801 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Screening of charge impurities in graphene is analyzed using the exact
solution for vacuum polarization obtained from the massless Dirac-Kepler
problem. For the impurity charge below certain critical value no density
perturbation is found away from the impurity, in agreement with the linear
response theory result. For supercritical charge, however, the polarization
distribution is shown to have a power law profile, leading to screening of the
excess charge at large distances. The Dirac-Kepler scattering states give rise
to standing wave oscillations in the local density of states which appear and
become prominent in the supercritical regime.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 19:56:00 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 19:25:43 GMT"
}
] | 2007-12-09T00:00:00 | [
[
"Shytov",
"A. V.",
""
],
[
"Katsnelson",
"M. I.",
""
],
[
"Levitov",
"L. S.",
""
]
] |
0705.4664 | Andy Gibb | A.G. Gibb (UBC), M.G. Hoare (Leeds) | A high-frequency radio continuum study of massive young stellar objects | 18 pages, 10 figures. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12046.x | null | astro-ph | null | We present high-resolution observations made with the Very Large Array (VLA)
in its A configuration at frequencies between 5 and 43 GHz of a sample of five
massive young stellar objects (YSOs): LkHa101, NGC2024-IRS2, S106-IR, W75N and
S140-IRS1. The resolution varied from 0.04 arcsec (at 43 GHz) to 0.5 arcsec (at
5 GHz), corresponding to a linear resolution as high as 17 AU for our nearest
source. A MERLIN observation of S106-IR at 23 GHz with 0.03-arcsec resolution
is also presented. S106-IR and S140-IRS1 are elongated at 43 GHz perpendicular
to their large scale bipolar outflows. This confirms the equatorial wind
picture for these sources seen previously in MERLIN 5 GHz observations. The
other sources are marginally resolved at 43 GHz. The spectral indices we derive
for the sources in our sample range from +0.2 to +0.8, generally consistent
with ionized stellar winds. We have modelled our sources as uniform, isothermal
spherical winds, with LkHa101 and NGC2024-IRS2 yielding the best fits. However,
in all cases our fits give wind temperatures of only 2000 to 5000 K, much less
than the effective temperatures of main-sequence stars of the same luminosity,
a result which is likely due to the clumpy nature of the winds.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:48:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gibb",
"A. G.",
"",
"UBC"
],
[
"Hoare",
"M. G.",
"",
"Leeds"
]
] |
0705.4665 | Andrea Lionetto | A. M. Lionetto | Non Thermal Neutralino Production in Deflected Anomaly Mediation | revtex4, 3 eps figures | null | null | null | hep-ph astro-ph | null | We study the effects of a non thermal neutralino production, due to the late
decay in the early universe of a single modulus field, in the context of the
deflected anomaly mediated scenario. In the regime in which the average number
of neutralino produced in each modulus decaying process is $\bar{N}_{{\rm
LSP}}\ll 1$ also models with a thermal relic density below WMAP data became
acceptable models. We find out that these models belong to three different
classes with the common feature that the low thermal relic density is entirely
due to coannihilation effects. The neutralino annihilation cross section for
these classes of models is not particularly high compared with the highest
cross sections attainable in the generic framework of the MSSM. Hence the
detection prospects either by direct or indirect WIMP search experiments are
not encouraging.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 17:50:30 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Lionetto",
"A. M.",
""
]
] |
0705.4666 | Hael Collins | Hael Collins (University of Massachusetts) and R. Holman (Carnegie
Mellon University) | Trans-Planckian signals from the breaking of local Lorentz invariance | 11 pages, no figures, uses ReVTeX | Phys.Rev.D77:105016,2008 | 10.1103/PhysRevD.77.105016 | UMHEP-464 | hep-ph hep-th | null | This article examines how a breakdown of a locally Lorentz invariant,
point-like description of nature at tiny space-time intervals would translate
into a distinctive set of signals in the primordial power spectrum generated by
inflation. We examine the leading irrelevant operators that are consistent with
the spatial translations and rotations of a preferred, isotropically expanding,
background. A few of the resulting corrections to the primordial power spectrum
do not have the usual oscillatory factor, which is sometimes taken to be
characteristic of a "trans-Planckian" signal. Perhaps more interestingly, one
of these leading irrelevant operators exactly reproduces a correction to the
power spectrum that occurs in effective descriptions of the state of the field
responsible for inflation.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:02:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Collins",
"Hael",
"",
"University of Massachusetts"
],
[
"Holman",
"R.",
"",
"Carnegie\n Mellon University"
]
] |
0705.4667 | Daniele Montanino dr. | A. Mirizzi (MPI), D. Montanino (Salento U. & INFN, Lecce), P.D.
Serpico (Fermilab) | Revisiting cosmological bounds on radiative neutrino lifetime | 7 pages, 3 figures. Minor changes in the text, few references added.
Matches the published version | Phys.Rev.D76:053007,2007 | 10.1103/PhysRevD.76.053007 | FERMILAB-PUB-07-135-A; MPP-2007-63 | hep-ph astro-ph | null | Neutrino oscillation experiments and direct bounds on absolute masses
constrain neutrino mass differences to fall into the microwave energy range,
for most of the allowed parameter space. As a consequence of these recent
phenomenological advances, older constraints on radiative neutrino decays based
on diffuse background radiations and assuming strongly hierarchical masses in
the eV range are now outdated. We thus derive new bounds on the radiative
neutrino lifetime using the high precision cosmic microwave background spectral
data collected by the Far Infrared Absolute Spectrophotometer instrument on
board of Cosmic Background Explorer. The lower bound on the lifetime is between
a few x 10^19 s and 5 x 10^20 s, depending on the neutrino mass ordering and on
the absolute mass scale. However, due to phase space limitations, the upper
bound in terms of the effective magnetic moment mediating the decay is not
better than ~ 10^-8 Bohr magnetons. We also comment about possible improvements
of these limits, by means of recent diffuse infrared photon background data. We
compare these bounds with pre-existing limits coming from laboratory or
astrophysical arguments. We emphasize the complementarity of our results with
others available in the literature.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:05:34 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Sep 2007 17:22:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mirizzi",
"A.",
"",
"MPI"
],
[
"Montanino",
"D.",
"",
"Salento U. & INFN, Lecce"
],
[
"Serpico",
"P. D.",
"",
"Fermilab"
]
] |
0705.4668 | Atsushi Nishizawa | Atsushi Nishizawa, Seiji Kawamura and Masa-aki Sakagami | Quantum Noise in Differential-type Gravitational-wave Interferometer and
Signal Recycling | 17 pages, submitted to Phys.Rev.D | Phys.Rev.D76:042002,2007 | 10.1103/PhysRevD.76.042002 | null | gr-qc | null | There exists the standard quantum limit (SQL), derived from Heisenberg's
uncertainty relation, in the sensitivity of laser interferometer
gravitational-wave detectors. However, in the context of a full
quantum-mechanical approach, SQL can be overcome using the correlation of shot
noise and radiation-pressure noise. So far, signal recycling, which is one of
the methods to overcome SQL, is considered only in a recombined-type
interferometer such as Advanced-LIGO, LCGT, and GEO600. In this paper, we
investigated quantum noise and the possibility of signal recycling in a
differential-type interferometer. As a result, we found that signal recycling
is possible and creates at most three dips in the sensitivity curve of the
detector. Then, taking advantage of the third additional dip and comparing the
sensitivity of a differential-type interferometer with that of a
next-generation Japanese GW interferometer, LCGT, we found that SNR of inspiral
binary is improved by a factor of 1.43 for neutron star binary, 2.28 for 50
M_sun black hole binary, and 2.94 for 100 M_sun black hole binary. We also
found that power recycling to increase laser power is possible in our
signal-recycling configuration of a detector.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:06:30 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 05:59:52 GMT"
},
{
"version": "v3",
"created": "Sun, 3 Jun 2007 11:53:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nishizawa",
"Atsushi",
""
],
[
"Kawamura",
"Seiji",
""
],
[
"Sakagami",
"Masa-aki",
""
]
] |
0705.4669 | Barry Davids | B. Davids, A. Gruzinov, and B. K. Jennings | Comment on "Influence of protons on the capture of electrons by 7Be in
the Sun" | Submitted to Physical Review C | Phys.Rev.C77:019801,2008 | 10.1103/PhysRevC.77.019801 | null | nucl-th astro-ph | null | This paper suffers from conceptual difficulties and unjustified
approximations that render its conclusions dubious.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:07:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Davids",
"B.",
""
],
[
"Gruzinov",
"A.",
""
],
[
"Jennings",
"B. K.",
""
]
] |
0705.4670 | C. A. Terrero-Escalante | Julio G. Dix, Cesar A. Terrero-Escalante | Stability of Solutions to Damped Equations with Negative Stiffness | 11 pages | null | null | null | math.CA math.DS | null | This article concerns the stability of a model for mass-spring systems with
positive damping and negative stiness. It is well known that when the
coefficients are frozen in time the system is unstable. Here we find conditions
on the variable cofficients to prove stability. In particular, we disprove the
believe that if the eigenvalues of the system change slowly in time the system
remains unstable. We extend some of our results for nonlinear systems.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 19:05:36 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Dix",
"Julio G.",
""
],
[
"Terrero-Escalante",
"Cesar A.",
""
]
] |
0705.4671 | Chandrasekhar Ramanathan | Anatoly E. Dementyev, David G. Cory, Chandrasekhar Ramanathan | Rapid Diffusion of dipolar order enhances dynamic nuclear polarization | 4 pages, 5 figures - submitted to PRL | Phys. Rev. B, 77 024413 (2008) | 10.1103/PhysRevB.77.024413 | null | cond-mat.other | null | In a dynamic nuclear polarization experiment on a 40 mM solution of
4-amino-TEMPO in a 40:60 water/glycerol mixture, we have observed that the bulk
dipolar reservoir is cooled to a spin temperature of 15.5 micro-K, following
microwave irradiation for 800 s. This is significantly cooler than the 35 mK
spin temperature of the Zeeman reservoir. Equilibration of the two reservoirs
results in a 50 % increase in the NMR signal intensity, corresponding to a
Zeeman spin temperature of 23 mK. In order to achieve this polarization
directly, it was necessary to irradiate the sample with microwaves for 1500 s.
Cooling of the dipolar reservoir occurs during polarization transport through
the magnetic field gradient around the paramagnetic impurity, and is rapidly
communicated to the bulk by dipolar spin diffusion. As dipolar spin diffusion
is significantly faster than Zeeman spin diffusion, the bulk dipolar reservoir
cools faster than the Zeeman reservoir. This process can be exploited to
rapidly polarize the nuclear spins, by repeatedly cooling the dipolar system
and transferring the polarization to the Zeeman reservoir.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:19:03 GMT"
}
] | 2009-04-01T00:00:00 | [
[
"Dementyev",
"Anatoly E.",
""
],
[
"Cory",
"David G.",
""
],
[
"Ramanathan",
"Chandrasekhar",
""
]
] |
0705.4672 | Lukasz Andrzej Glinka | A. B. Arbuzov, L. A. Glinka, V. N. Pervushin | Higgs Particle Mass in Cosmology | Extended version with a brief description of cosmological model;
updated discussion of our prediction for the Higgs boson mass | null | null | null | hep-ph astro-ph gr-qc hep-th | null | A version of the Standard Model is considered, where the electroweak symmetry
breaking is provided by cosmological initial data given for the zeroth Fourier
harmonic of the Higgs field $<\phi>$. The initial data symmetry breaking
mechanism removes the Higgs field contribution to the vacuum energy density,
possible creation of monopoles, and tachion behavior at high energies, if one
imposes an ``inertial'' condition on the Higgs potential $\textsf{V}_{\rm
Higgs}(<\phi>)=0$. The requirement of zero radiative corrections to this {\em
inertial} condition coincides with the limiting point of the vacuum stability
in the Standard Model. The latter together with the direct experimental limit
gives the prediction for the mass of the Higgs boson to be in the range $114 <
m_h \lsim 134$ GeV.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:23:57 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 06:16:38 GMT"
},
{
"version": "v3",
"created": "Mon, 9 Jul 2007 04:50:41 GMT"
},
{
"version": "v4",
"created": "Tue, 14 Aug 2007 13:41:38 GMT"
},
{
"version": "v5",
"created": "Wed, 14 Nov 2007 08:09:23 GMT"
},
{
"version": "v6",
"created": "Sun, 13 Jan 2008 14:31:39 GMT"
}
] | 2008-01-14T00:00:00 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Glinka",
"L. A.",
""
],
[
"Pervushin",
"V. N.",
""
]
] |
0705.4673 | B\'ela Csaba | B\'ela Csaba (Anal. and Stoch. Res. Group, HAS), Andr\'as S. Pluh\'ar
(Dept. of Comp. Sci., Univ. of Szeged) | A randomized algorithm for the on-line weighted bipartite matching
problem | to be published | null | null | null | cs.DS cs.DM | null | We study the on-line minimum weighted bipartite matching problem in arbitrary
metric spaces. Here, $n$ not necessary disjoint points of a metric space $M$
are given, and are to be matched on-line with $n$ points of $M$ revealed one by
one. The cost of a matching is the sum of the distances of the matched points,
and the goal is to find or approximate its minimum. The competitive ratio of
the deterministic problem is known to be $\Theta(n)$. It was conjectured that a
randomized algorithm may perform better against an oblivious adversary, namely
with an expected competitive ratio $\Theta(\log n)$. We prove a slightly weaker
result by showing a $o(\log^3 n)$ upper bound on the expected competitive
ratio. As an application the same upper bound holds for the notoriously hard
fire station problem, where $M$ is the real line.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:35:21 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 20:24:22 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Csaba",
"Béla",
"",
"Anal. and Stoch. Res. Group, HAS"
],
[
"Pluhár",
"András S.",
"",
"Dept. of Comp. Sci., Univ. of Szeged"
]
] |
0705.4674 | Chris Adami | Arend Hintze and Christoph Adami (KGI) | Evolution of complex modular biological networks | 28 pages, 10 figures, 8 supplemental figures, and one supplementary
table. Final version to appear in PLoS Comp Bio | PLoS Computational Biology 4(2):e23 (2008) | 10.1371/journal.pcbi.0040023 | null | q-bio.MN q-bio.PE | null | Biological networks have evolved to be highly functional within uncertain
environments while remaining extremely adaptable. One of the main contributors
to the robustness and evolvability of biological networks is believed to be
their modularity of function, with modules defined as sets of genes that are
strongly interconnected but whose function is separable from those of other
modules. Here, we investigate the in silico evolution of modularity and
robustness in complex artificial metabolic networks that encode an increasing
amount of information about their environment while acquiring ubiquitous
features of biological, social, and engineering networks, such as scale-free
edge distribution, small-world property, and fault-tolerance. These networks
evolve in environments that differ in their predictability, and allow us to
study modularity from topological, information-theoretic, and gene-epistatic
points of view using new tools that do not depend on any preconceived notion of
modularity. We find that for our evolved complex networks as well as for the
yeast protein-protein interaction network, synthetic lethal pairs consist
mostly of redundant genes that lie close to each other and therefore within
modules, while knockdown suppressor pairs are farther apart and often straddle
modules, suggesting that knockdown rescue is mediated by alternative pathways
or modules. The combination of network modularity tools together with genetic
interaction data constitutes a powerful approach to study and dissect the role
of modularity in the evolution and function of biological networks.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:28:04 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Dec 2007 19:52:33 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Hintze",
"Arend",
"",
"KGI"
],
[
"Adami",
"Christoph",
"",
"KGI"
]
] |
0705.4675 | Rajit Chaudhury | R. P. Chaudhury, F. Yen, C. R. dela Cruz, B. Lorenz, Y. Q.Wang, Y. Y.
Sun, C. W. Chu | Thermal expansion and pressure effect in MnWO4 | 2 pages, 3 figures. SCES conference proceedings, houston, TX, 2007.
to be published in Physica B | null | 10.1016/j.physb.2007.10.327 | null | cond-mat.mtrl-sci | null | MnWO4 has attracted attention because of its ferroelectric property induced
by frustrated helical spin order. Strong spin-lattice interaction is necessary
to explain ferroelectricity associated with this type of magnetic order.We have
conducted thermal expansion measurements along the a, b, c axes revealing the
existence of strong anisotropic lattice anomalies at T1=7.8 K, the temperature
of the magnetic lock-in transition into a commensurate low-temperature
(reentrant paraelectric) phase. The effect of hydrostatic pressure up to 1.8
GPa on the FE phase is investigated by measuring the dielectric constant and
the FE polarization. The low- temperature commensurate and paraelectric phase
is stabilized and the stability range of the ferroelectric phase is diminished
under pressure.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:36:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chaudhury",
"R. P.",
""
],
[
"Yen",
"F.",
""
],
[
"Cruz",
"C. R. dela",
""
],
[
"Lorenz",
"B.",
""
],
[
"Wang",
"Y. Q.",
""
],
[
"Sun",
"Y. Y.",
""
],
[
"Chu",
"C. W.",
""
]
] |
0705.4676 | Daniel Lemire | Daniel Lemire and Owen Kaser | Recursive n-gram hashing is pairwise independent, at best | See software at https://github.com/lemire/rollinghashcpp | Computer Speech & Language 24(4): 698-710 (2010) | 10.1016/j.csl.2009.12.001 | null | cs.DB cs.CL | http://creativecommons.org/licenses/by/4.0/ | Many applications use sequences of n consecutive symbols (n-grams). Hashing
these n-grams can be a performance bottleneck. For more speed, recursive hash
families compute hash values by updating previous values. We prove that
recursive hash families cannot be more than pairwise independent. While hashing
by irreducible polynomials is pairwise independent, our implementations either
run in time O(n) or use an exponential amount of memory. As a more scalable
alternative, we make hashing by cyclic polynomials pairwise independent by
ignoring n-1 bits. Experimentally, we show that hashing by cyclic polynomials
is is twice as fast as hashing by irreducible polynomials. We also show that
randomized Karp-Rabin hash families are not pairwise independent.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:41:28 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Dec 2008 17:39:33 GMT"
},
{
"version": "v3",
"created": "Fri, 6 Feb 2009 21:37:14 GMT"
},
{
"version": "v4",
"created": "Mon, 23 Feb 2009 16:23:41 GMT"
},
{
"version": "v5",
"created": "Wed, 5 Aug 2009 03:01:20 GMT"
},
{
"version": "v6",
"created": "Wed, 19 Aug 2009 14:39:54 GMT"
},
{
"version": "v7",
"created": "Wed, 4 Jan 2012 20:37:05 GMT"
},
{
"version": "v8",
"created": "Mon, 6 Jun 2016 15:18:03 GMT"
}
] | 2016-06-07T00:00:00 | [
[
"Lemire",
"Daniel",
""
],
[
"Kaser",
"Owen",
""
]
] |
0705.4677 | Diogo Rodrigues Boito | D. R. Boito, B. El-Bennich, B. Loiseau, O. Leitner | Resonances and weak interactions in $D^+ \to\pi^+ \pi^- \pi^+$ decays | 4 pages. Contribution to the X Hadron Physics, Florianopolis-Brazil,
March 26-31, 2007 | Int.J.Mod.Phys.E16:2876-2879,2007 | 10.1142/S0218301307008628 | null | hep-ph | null | We describe the $\pi\pi$ $S$-wave in $D^+ \to\pi^+ \pi^- \pi^+$ decays using
a unitary model for the $\pi\pi$ Final State Interactions (FSI). The three body
decay is treated as a quasi two-body process where, at the weak vertex, the D
meson decays into a resonance and a pion. The weak part of the decay amplitude
is evaluated using the effective weak Hamiltonian within the factorization
approximation.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:39:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Boito",
"D. R.",
""
],
[
"El-Bennich",
"B.",
""
],
[
"Loiseau",
"B.",
""
],
[
"Leitner",
"O.",
""
]
] |
0705.4678 | H. Pierre Noyes | H.Pierre Noyes | On Biology as an Emergent Science | 24 pages, 1 figure | null | null | SLAC-PUB-12505 | physics.gen-ph | null | Biology is considered here as an "emergent science" in the sense of Anderson
and of Laughlin and Pines. It is demonstrated that a straightforward
mathematical definition of "biological system" is useful in showing how biology
differs in structure from the lower levels in Anderson's "More is Different"
hierarchy. Using cells in a chemostat as a paradigmatic exemplar of a
biological system, it is found that a coherent collection of metabolic pathways
through a single cell in the chemostat also satisfies the proposed definition
of a biological system. This provides a theoretical and mathematical
underpinning for Young's fundamental model of biological organization and
integration. Evidence for the therapeutic efficacy of Young's method of
analysis is provided by preliminary results of clinical trials of a specific
application of Young's model to the treatment of cancer cachexia.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:42:12 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 23:01:29 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Noyes",
"H. Pierre",
""
]
] |
0705.4679 | Todd Adams | T. Adams (for the CDF and D0 collaborations) | Searches for New Phenomena with Lepton Final States at the Tevatron | Prepared for the XLIInd Renconstres de Moriond Electroweak 2007, La
Thuile, Italy | null | null | FERMILAB-CONF-07-145-E | hep-ex | null | Numerous searches for new phenomena have been carried out using data from
proton-antiproton collisions at Fermilab's Tevatron. Final states with leptons
give signatures which are relatively unique and generally have small
backgrounds. We present many of the latest results from the CDF and D0
collaborations from 0.4-1.2 fb^-1 of data. Topics include supersymmetry, extra
gauge bosons, Randall-Sundrum gravitons, excited electrons and neutral,
long-lived particles.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 19:16:11 GMT"
}
] | 2007-06-01T00:00:00 | [
[
"Adams",
"T.",
"",
"for the CDF and D0 collaborations"
]
] |
0705.4680 | Steen H. Hansen | Steen H. Hansen, Rocco Piffaretti | Measuring the dark matter velocity anisotropy in galaxy clusters | 5 pages, 3 figures, extended discussions, matches accepted version | null | 10.1051/0004-6361:20078656 | null | astro-ph hep-ph | null | The Universe contains approximately 6 times more dark matter than normal
baryonic matter, and a directly observed fundamental difference between dark
matter and baryons would both be significant for our understanding of dark
matter structures and provide us with information about the basic
characteristics of the dark matter particle. We discuss one distinctive feature
of dark matter structures in equilibrium, namely the property that a local dark
matter temperature may depend on direction. This is in stark contrast to
baryonic gases. We used X-ray observations of two nearby, relaxed galaxy
clusters, under the assumptions of hydrostatic equilibrium and identical dark
matter and gas temperatures in the outer cluster region, to measure this dark
matter temperature anisotropy beta_dm, with non-parametric Monte Carlo methods.
We find that beta_dm is greater than the value predicted for baryonic gases,
beta_gas=0, at more than 3 sigma confidence. The observed value of the
temperature anisotropy is in fair agreement with the results of cosmological
N-body simulations and shows that the equilibration of the dark matter
particles is not governed by local point-like interactions in contrast to
baryonic gases.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 18:52:38 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Nov 2007 12:33:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hansen",
"Steen H.",
""
],
[
"Piffaretti",
"Rocco",
""
]
] |
0705.4681 | Ilya Kapovich | Ilya Kapovich and Paul Schupp | On group-theoretic models of randomness and genericity | final version, appeared in: Groups, Geometry and Dynamics 2 (2008),
no. 3, pp. 383-404 | Groups, Geometry and Dynamics 2 (2008), no. 3, pp. 383-404 | null | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the random group model of Gromov and the model of generic groups
of Arzhantseva and Ol'shanskii.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 19:37:57 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Feb 2010 13:01:19 GMT"
}
] | 2010-02-08T00:00:00 | [
[
"Kapovich",
"Ilya",
""
],
[
"Schupp",
"Paul",
""
]
] |
0705.4682 | Axel Krause | Axel Krause, Enrico Pajer | Chasing Brane Inflation in String-Theory | 34 pages, 4 figures. Final version published in JCAP | JCAP 0807:023,2008 | 10.1088/1475-7516/2008/07/023 | LMU-ASC-35/07 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the embedding of brane anti-brane inflation into a concrete
type IIB string theory compactification with all moduli fixed. Specifically, we
are considering a D3-brane, whose position represents the inflaton $\phi$, in a
warped conifold throat in the presence of supersymmetrically embedded D7-branes
and an anti D3-brane localized at the tip of the warped conifold cone. After
presenting the moduli stabilization analysis for a general D7-brane embedding,
we concentrate on two explicit models, the Ouyang and the Kuperstein
embeddings. We analyze whether the forces, induced by moduli stabilization and
acting on the D3-brane, might cancel by fine-tuning such as to leave us with
the original Coulomb attraction of the anti D3-brane as the driving force for
inflation. For a large class of D7-brane embeddings we obtain a negative
result. Cancelations are possible only for very small intervals of $\phi$
around an inflection point but not globally. For the most part of its motion
the inflaton then feels a steep, non slow-roll potential. We study the
inflationary dynamics induced by this potential.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 19:42:29 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 19:40:28 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Feb 2008 15:23:25 GMT"
},
{
"version": "v4",
"created": "Thu, 28 Feb 2008 09:48:49 GMT"
},
{
"version": "v5",
"created": "Tue, 30 Sep 2008 11:00:40 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Krause",
"Axel",
""
],
[
"Pajer",
"Enrico",
""
]
] |
0705.4683 | Wang Yao | Wang Yao, Di Xiao, and Qian Niu | Valley Dependent Optoelectronics from Inversion Symmetry Breaking | Expanded version, to appear in Phys. Rev. B | Phys. Rev. B 77, 235406 (2008). | 10.1103/PhysRevB.77.235406 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Inversion symmetry breaking allows contrasted circular dichroism in different
k-space regions, which takes the extreme form of optical selection rules for
interband transitions at high symmetry points. In materials where band-edges
occur at noncentral valleys, this enables valley dependent interplay of
electrons with light of different circular polarizations, in analogy to spin
dependent optical activities in semiconductors. This discovery is in perfect
harmony with the previous finding of valley contrasted Bloch band features of
orbital magnetic moment and Berry curvatures from inversion symmetry breaking
[Phys. Rev. Lett. 99, 236809 (2007)]. A universal connection is revealed
between the k-resolved optical oscillator strength of interband transitions,
the orbital magnetic moment and the Berry curvatures, which also provides a
principle for optical measurement of orbital magnetization and intrinsic
anomalous Hall conductivity in ferromagnetic systems. The general physics is
demonstrated in graphene where inversion symmetry breaking leads to valley
contrasted optical selection rule for interband transitions. We discuss
graphene based valley optoelectronics applications where light polarization
information can be interconverted with electronic information.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 19:49:33 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Jun 2007 21:21:08 GMT"
},
{
"version": "v3",
"created": "Mon, 12 May 2008 16:52:25 GMT"
}
] | 2008-06-05T00:00:00 | [
[
"Yao",
"Wang",
""
],
[
"Xiao",
"Di",
""
],
[
"Niu",
"Qian",
""
]
] |
0705.4684 | Valentino Cooper | Valentino R. Cooper, Karen Johnston and Karin M. Rabe | Polarization Enhancement in Short Period Superlattices via Interfacial
Intermixing | 4 pages, 6 figures | PRB 76, 020103 (R) (2007) | 10.1103/PhysRevB.76.020103 | null | cond-mat.mtrl-sci | null | The effect of intermixing at the interface of short period
PbTiO$_3$/SrTiO$_3$ superlattices is studied using first-principles density
functional theory. The results indicate that interfacial intermixing
significantly enhances the polarization within the superlattice. This
enhancement is directly related to the off-centering of Pb and Sr cations and
can be explained through a discussion of interacting dipoles. This picture
should be general for a wide range of multicomponent superlattices and may have
important consequences for the design of ferroelectric devices.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 19:54:21 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 20:08:13 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Jun 2007 20:36:15 GMT"
}
] | 2012-03-12T00:00:00 | [
[
"Cooper",
"Valentino R.",
""
],
[
"Johnston",
"Karen",
""
],
[
"Rabe",
"Karin M.",
""
]
] |
0706.0001 | Z. C. Tu | Z. C. Tu and Z. C. Ou-Yang | Elastic theory of low-dimensional continua and its applications in bio-
and nano-structures | Review article for J. Comput. Theor. Nanosci., 27 pages, 15 figures | J. Comput. Theor. Nanosci. 5, 422-448 (2008) | null | null | cond-mat.soft cond-mat.mtrl-sci math-ph math.MP physics.bio-ph q-bio.QM | null | This review presents the elastic theory of low-dimensional (one- and
two-dimensional) continua and its applications in bio- and nano-structures.
First, the curve and surface theory, as the geometric representation of the
low-dimensional continua, is briefly described through Cartan moving frame
method. The elastic theory of Kirchhoff rod, Helfrich rod, bending-soften rod,
fluid membrane, and solid shell is revisited. Secondly, the application and
availability of the elastic theory of low-dimensional continua in
bio-structures, including short DNA rings, lipid membranes, and cell membranes,
are discussed. The kink stability of short DNA rings is addressed by using the
theory of Kirchhoff rod, Helfrich rod, and bending-soften rod. The lipid
membranes obey the theory of fluid membrane. A cell membrane is simplified as a
composite shell of lipid bilayer and membrane skeleton, which is a little
similar to the solid shell. It is found that the membrane skeleton enhances
highly the mechanical stability of cell membranes. Thirdly, the application and
availability of the elastic theory of low-dimensional continua in
nano-structures, including graphene and carbon nanotubes, are discussed. A
revised Lenosky lattice model is proposed based on the local density
approximation. Its continuum form up to the second order terms of curvatures
and strains is the same as the free energy of 2D solid shells. Several typical
mechanical properties of carbon nanotubes are revisited and investigated based
on this continuum form. It is possible to avoid introducing the controversial
concepts, the Young's modulus and thickness of graphene and single-walled
carbon nanotubes, with this continuum form.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 12:10:57 GMT"
},
{
"version": "v2",
"created": "Sun, 1 Jun 2008 15:46:15 GMT"
}
] | 2015-01-20T00:00:00 | [
[
"Tu",
"Z. C.",
""
],
[
"Ou-Yang",
"Z. C.",
""
]
] |
0706.0002 | Sebastian Eggert | Sebastian Eggert, Olav F. Syljuasen, Fabrizio Anfuso, Markus Andres | Universal alternating order around impurities in antiferromagnets | 5 pages, 2 figures. The most recent version in PDF format can be
found at http://www.physik.uni-kl.de/eggert/papers/ | Phys. Rev. Lett. 99, 097204 (2007). | 10.1103/PhysRevLett.99.097204 | null | cond-mat.str-el cond-mat.supr-con | null | The study of impurities in antiferromagnets is of considerable interest in
condensed matter physics. In this paper we address the elementary question of
the effect of vacancies on the orientation of the surrounding magnetic moments
in an antiferromagnet. In the presence of a magnetic field, alternating
magnetic moments are induced, which can be described by a universal expression
that is valid in any ordered antiferromagnet and turns out to be independent of
temperature over a large range. The universality is not destroyed by quantum
fluctuation, which is demonstrated by quantum Monte Carlo simulations in the
two-dimensional Heisenberg antiferromagnet. Physical predictions for finite
doping are made, which are relevant for experiments probing Knight shifts and
the order parameter.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:00:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Eggert",
"Sebastian",
""
],
[
"Syljuasen",
"Olav F.",
""
],
[
"Anfuso",
"Fabrizio",
""
],
[
"Andres",
"Markus",
""
]
] |
0706.0003 | X. Z. Zheng | Xian Zhong Zheng (1,2), Herve Dole (3), Eric F. Bell (1), Emeric Le
Floc'h (4), George H. Rieke (5), Hans-Walter Rix (1) and David Schiminovich
(6) ((1) MPIA in Heidelberg, Germany; (2) Purple Mountain Observatory, China;
(3) IAS, Universite Paris-Sud 11 and CNRS, France; (4) IfA, University of
Hawaii; (5) Steward Observatory, University of Arizona; (6) Department of
Astronomy, Columbia University) | Infrared Spectral Energy Distributions of z~0.7 Star-Forming Galaxies | 12 pages, 11 figures, 2 tables, accepted for publication in ApJ | null | 10.1086/520529 | null | astro-ph | null | We analyze the infrared (IR) spectral energy distributions (SEDs) for
10micron < lambda(rest) < 100micron for ~600 galaxies at z~0.7 in the extended
Chandra Deep Field South by stacking their Spitzer 24, 70 and 160micron images.
We place interesting constraints on the average IR SED shape in two bins: the
brightest 25% of z~0.7 galaxies detected at 24micron, and the remaining 75% of
individually-detected galaxies. Galaxies without individual detections at
24micron were not well-detected at 70micron and 160micron even through
stacking. We find that the average IR SEDs of z~0.7 star-forming galaxies fall
within the diversity of z~0 templates. While dust obscuration Lir/Luv seems to
be only a function of star formation rate (SFR; ~ Lir+Luv), not of redshift,
the dust temperature of star-forming galaxies (with SFR ~ 10 solar mass per
year) at a given IR luminosity was lower at z~0.7 than today. We suggest an
interpretation of this phenomenology in terms of dust geometry: intensely
star-forming galaxies at z~0 are typically interacting, and host dense
centrally-concentrated bursts of star formation and warm dust temperatures. At
z~0.7, the bulk of intensely star-forming galaxies are relatively undisturbed
spirals and irregulars, and we postulate that they have large amounts of
widespread lower-density star formation, yielding lower dust temperatures for a
given IR luminosity. We recommend what IR SEDs are most suitable for modeling
intermediate redshift galaxies with different SFRs.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:00:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zheng",
"Xian Zhong",
""
],
[
"Dole",
"Herve",
""
],
[
"Bell",
"Eric F.",
""
],
[
"Floc'h",
"Emeric Le",
""
],
[
"Rieke",
"George H.",
""
],
[
"Rix",
"Hans-Walter",
""
],
[
"Schiminovich",
"David",
""
]
] |
0706.0004 | Eric F. Bell | Eric F. Bell, Daniel B. Zucker, Vasily Belokurov, Sanjib Sharma,
Kathryn V. Johnston, James S. Bullock, David W. Hogg, Knud Jahnke, Jelte T.
A. de Jong, Timothy C. Beers, N. W. Evans, Eva K. Grebel, Zeljko Ivezic,
Sergey E. Koposov, Hans-Walter Rix, Donald P. Schneider, Matthias Steinmetz
and Adi Zolotov | The accretion origin of the Milky Way's stellar halo | Submitted to the Astrophysical Journal. 14 pages; 11 figures | Astrophys.J.680:295-311,2008 | 10.1086/588032 | null | astro-ph | null | We have used data from the Sloan Digital Sky Survey (SDSS) Data Release 5 to
explore the overall structure and substructure of the stellar halo of the Milky
Way using about 4 million color-selected main sequence turn-off stars. We fit
oblate and triaxial broken power-law models to the data, and found a `best-fit'
oblateness of the stellar halo 0.5<c/a<0.8, and halo stellar masses between
Galactocentric radii of 1 and 40kpc of (3.7+/-1.2)x10^8 M_sun. The density
profile of the stellar halo is approximately r^{-3}; it is possible that the
power law slope is shallower inside 20kpc and steeper outside that radius. Yet,
we found that all smooth and symmetric models were very poor fits to the
distribution of stellar halo stars because the data exhibit a great deal of
spatial substructure. We quantified deviations from a smooth oblate/triaxial
model using the RMS of the data around the model profile on scales >~100pc,
after accounting for the (known) contribution of Poisson uncertainties. The
fractional RMS deviation of the actual stellar distribution from any smooth,
parameterized halo model is >~40%: hence, the stellar halo is highly
structured. We compared the observations with simulations of galactic stellar
halos formed entirely from the accretion of satellites in a cosmological
context by analysing the simulations in the same way as the data. While the
masses, overall profiles, and degree of substructure in the simulated stellar
halos show considerable scatter, the properties and degree of substructure in
the Milky Way's halo match well the properties of a `typical' stellar halo
built exclusively out of the debris from disrupted satellite galaxies. Our
results therefore point towards a picture in which an important fraction of the
Milky Way's stellar halo has been accreted from satellite galaxies.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:22:54 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Mar 2008 15:06:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bell",
"Eric F.",
""
],
[
"Zucker",
"Daniel B.",
""
],
[
"Belokurov",
"Vasily",
""
],
[
"Sharma",
"Sanjib",
""
],
[
"Johnston",
"Kathryn V.",
""
],
[
"Bullock",
"James S.",
""
],
[
"Hogg",
"David W.",
""
],
[
"Jahnke",
"Knud",
""
],
[
"de Jong",
"Jelte T. A.",
""
],
[
"Beers",
"Timothy C.",
""
],
[
"Evans",
"N. W.",
""
],
[
"Grebel",
"Eva K.",
""
],
[
"Ivezic",
"Zeljko",
""
],
[
"Koposov",
"Sergey E.",
""
],
[
"Rix",
"Hans-Walter",
""
],
[
"Schneider",
"Donald P.",
""
],
[
"Steinmetz",
"Matthias",
""
],
[
"Zolotov",
"Adi",
""
]
] |
0706.0005 | Daisuke Kawata | Daisuke Kawata (1,2), Renyue Cen (3), Luis C. Ho (1) ((1) Carnegie
Observatories, (2) Swinburne, (3) Princeton) | Gravitational Stability of Circumnuclear Disks in Elliptical Galaxies | 8 pages, 5 figures, accepted for publication in ApJ | null | 10.1086/521299 | null | astro-ph | null | A significant fraction of nearby elliptical galaxies are known to have high
density gas disks in their circumnuclear (CN) region (0.1 to a few kpc). Yet,
ellipticals, especially luminous ones, show little signs of recent star
formation (SF). To investigate the possible cause of the dearth of SF in these
systems, we study the gravitational stability of CN gas disks embedded within
the potentials of both the stellar bulge and the central massive black hole
(BH) in ellipticals. We find that CN disks in higher mass galaxies are
generally more stable than those in lower mass galaxies, because higher mass
galaxies tend to have more massive BHs and more centrally concentrated stellar
density profiles. We also consider the case in which the central stellar
density profile has a core, which is often observed for ellipticals whose total
stellar mass is higher than about 10^11 Msun. Such a cored stellar density
profile leads to more unstable CN disks than the power-law density profile
characteristic of less massive galaxies. However, the more massive BHs in
high-mass galaxies act to stabilize the CN disk. Our results demonstrate that
the gravitational potentials of both the central BH and the stellar component
should be taken into account when studying the properties of CN disks, as their
stability is sensitive to both the BH mass and the stellar density profile. Our
results could explain the observed trend that less luminous ellipticals have a
greater tendency to exhibit ongoing SF than giant ellipticals.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:25:51 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 19:45:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kawata",
"Daisuke",
""
],
[
"Cen",
"Renyue",
""
],
[
"Ho",
"Luis C.",
""
]
] |
0706.0006 | Isaac Shlosman | Yehuda Hoffman (Hebrew University, Jerusalem, Israel), Emilio
Romano-Diaz (U. of Kentucky, Lexington, USA), Isaac Shlosman (U. of Kentucky,
Lexington, USA) and Clayton Heller (GSU, Statesboro, USA) | Evolution of Phase-Space Density in Dark Matter Halos | 7 pages, 5 figures, accepted by the Astrophysical Journal. Revised, 2
figures added | null | 10.1086/523695 | null | astro-ph | null | The evolution of the phase-space density profile in dark matter (DM) halos is
investigated by means of constrained simulations, designed to control the
merging history of a given DM halo. Halos evolve through a series of quiescent
phases of a slow accretion intermitted by violent events of major mergers. In
the quiescent phases the density of the halo closely follows the NFW profile
and the phase-space density profile, Q(r), is given by the Taylor & Navarro
power law, r^{-beta}, where beta ~ 1.9 and stays remarkably stable over the
Hubble time. Expressing the phase-space density by the NFW parameters, Q(r)=Qs
(r/Rs)^{-beta}, the evolution of Q is determined by Qs. We have found that the
effective mass surface density within Rs, Sigma_s = rhos Rs, remains constant
throughout the evolution of a given DM halo along the main branch of its
merging tree. This invariance entails that Qs ~ Rs^{-5/2} and Q(r) ~
Sigma_s^{-1/2} Rs^{-5/2} (r/ Rs)^{-beta}. It follows that the phase-space
density remains constant, in the sense of Qs=const., in the quiescent phases
and it decreases as Rs^{-5/2} in the violent ones. The physical origin of the
NFW density profile and the phase-space density power law is still unknown.
Yet, the numerical experiments show that halos recover these relations after
the violent phases. The major mergers drive Rs to increase and Qs to decrease
discontinuously while keeping Qs Rs^{5/2} = const. The virial equilibrium in
the quiescent phases implies that a DM halos evolves along a sequence of NFW
profiles with constant energy per unit volume (i.e., pressure) within Rs.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:17:32 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 20:19:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hoffman",
"Yehuda",
"",
"Hebrew University, Jerusalem, Israel"
],
[
"Romano-Diaz",
"Emilio",
"",
"U. of Kentucky, Lexington, USA"
],
[
"Shlosman",
"Isaac",
"",
"U. of Kentucky,\n Lexington, USA"
],
[
"Heller",
"Clayton",
"",
"GSU, Statesboro, USA"
]
] |
0706.0007 | Yang Bai | Yang Bai, JiJi Fan and Zhenyu Han | Higgs boson from the meta-stable SUSY breaking sector | 9 pages, 1 figure; two paragraphs added to clarify the scales in our
model; final version in PRD | Phys.Rev.D76:065003,2007 | 10.1103/PhysRevD.76.065003 | null | hep-ph | null | We construct a calculable model of electroweak symmetry breaking in which the
Higgs doublet emerges from the meta-stable SUSY breaking sector as a pseudo
Nambu-Goldstone boson. The Higgs boson mass is further protected by the little
Higgs mechanism, and naturally suppressed by a two-loop factor from the SUSY
breaking scale of 10 TeV. Gaugino and sfermion masses arise from standard gauge
mediation, but the Higgsino obtains a tree-level mass at the SUSY breaking
scale. At 1 TeV, aside from new gauge bosons and fermions similar to other
little Higgs models and their superpartners, our model predicts additional
electroweak triplets and doublets from the SUSY breaking sector.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:02:25 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 20:36:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bai",
"Yang",
""
],
[
"Fan",
"JiJi",
""
],
[
"Han",
"Zhenyu",
""
]
] |
0706.0008 | Silvio R. Dahmen | Silvio R. Dahmen | Boltzmann and the art of flying | 15 pages, no figures | Physics in Perspective 11 (3) (2009) | 10.1007/s00016-008-0395-1 | null | physics.hist-ph physics.soc-ph | null | One of the less known facets of Ludwig Boltzmann was that of an advocate of
Aviation, one of the most challenging technological problems of his times.
Boltzmann followed closely the studies of pioneers like Otto Lilienthal in
Berlin, and during a lecture on a prestigious conference he vehemently defended
further investments in the area. In this article I discuss his involvement with
Aviation, his role in its development and his correspondence with two flight
pioneers, Otto Lilienthal e Wilhelm Kress.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:02:36 GMT"
}
] | 2010-01-02T00:00:00 | [
[
"Dahmen",
"Silvio R.",
""
]
] |
0706.0009 | Yasuhide Numata | Takuro Abe, Yasuhide Numata | Exponents of 2-multiarrangements and multiplicity lattices | 14 pages | J. Algebraic Combin. 35 (2012), no. 1, 1-17 | 10.1007/s10801-011-0291-7 | null | math.CO math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a concept of multiplicity lattices of 2-multiarrangements,
determine the combinatorics and geometry of that lattice, and give a criterion
and method to construct a basis for derivation modules effectively.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:17:36 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Apr 2011 01:17:31 GMT"
}
] | 2014-02-11T00:00:00 | [
[
"Abe",
"Takuro",
""
],
[
"Numata",
"Yasuhide",
""
]
] |
0706.0010 | Fan Yizhong | Yi-Zhong Fan and Tsvi Piran | A Canonical High Energy Afterglow Emission Light Curve? | 5 pages including 3 eps figures. To appear in the proceedings of
"070228: The Next Decade of GRB afterglows", Amsterdam, 19-23 March 2007 | null | null | null | astro-ph | null | We present self consistent calculations of Synchrotron self Compton (SSC)
radiation that takes place within the afterglow blast wave and External inverse
Compton (EIC) radiation that takes place when flare photons (produced by an
internal process) pass through the blast wave. We show that if our current
interpretations of the Swift XRT data are correct, there should be a canonical
high energy afterglow emission light curve. We expect that GRBs with a long
term X-ray flattening or X-ray flares should show similar high energy features.
The EIC emission, however, is long lasting and weak and might be outshined by
the SSC emission of the forward shock. The high energy emission could be well
detected by the soon to be launched GLAST satellite. Its detection could shed
new light on the conditions within the emitting regions of GRBs.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:06:10 GMT"
}
] | 2007-06-04T00:00:00 | [
[
"Fan",
"Yi-Zhong",
""
],
[
"Piran",
"Tsvi",
""
]
] |
0706.0011 | Magdalena Anna Pelc | Magdalena Anna Pelc | Time delayed processes in physics, biophysics and archaeology | 51 pages | null | null | null | physics.gen-ph | null | The motion of particles, where the particles: electrons, ions in microtubules
or migrated peoples can be described as the superposition of diffusion and
ordered waves. In this paper it is shown that the master equation for transport
processes can be formulated as the time delayed hyperbolic partial equation.
The equation describes the processes with memory. For characteristic times
shorter than the relaxation time the master equation is the generalized Klein -
Gordon equation.
Key words: hyperbolic transport, microtubules, heat waves, Neolithic
migration
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:08:19 GMT"
}
] | 2007-06-04T00:00:00 | [
[
"Pelc",
"Magdalena Anna",
""
]
] |
0706.0012 | Germ\'an Cristiani | G. Cristiani, C.G. Gim\'enez de Castro, M.L. Luoni, C.H. Mandrini,
M.G. Rovira, P. Kaufmann | Observed flux density enhancement at submillimeter wavelengths during an
X-class flare | 13 pages, 7 figures | Adv.SpaceRes.39:1447-1452,2007 | 10.1016/j.asr.2007.02.039 | null | astro-ph | null | We analyse the 30 October, 2004, X1.2/SF solar event that occurred in AR
10691 (N13 W18) at around 11:44 UT. Observations at 212 and 405 GHz of the
Solar Submillimeter Telescope (SST), with high time resolution (5 ms), show an
intense impulsive burst followed by a long-lasting thermal phase. EUV images
from the Extreme Ultraviolet Imaging Telescope (SOHO/EIT) are used to identify
the possible emitting sources. Data from the Radio Solar Telescope Network
(RSTN) complement our spectral observations below 15 GHz. During the impulsive
phase the turnover frequency is above 15.4 GHz. The long-lasting phase is
analysed in terms of thermal emission and compared with GOES observations. From
the ratio between the two GOES soft X-ray bands, we derive the temperature and
emission measure, which is used to estimate the free-free submillimeter flux
density. Good temporal agreement is found between the estimated and observed
profiles, however the former is larger than the latter.
| [
{
"version": "v1",
"created": "Thu, 31 May 2007 20:17:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cristiani",
"G.",
""
],
[
"de Castro",
"C. G. Giménez",
""
],
[
"Luoni",
"M. L.",
""
],
[
"Mandrini",
"C. H.",
""
],
[
"Rovira",
"M. G.",
""
],
[
"Kaufmann",
"P.",
""
]
] |
0706.0013 | Alvaro Dom\'inguez | Alvaro Dominguez, Martin Oettel, Siegfried Dietrich | Theory of capillary-induced interactions beyond the superposition
approximation | Minor typos corrected | J. Chem. Phys. 127 (2007) 204706 | 10.1063/1.2781420 | null | cond-mat.soft | null | Within a general theoretical framework we study the effective,
deformation-induced interaction between two colloidal particles trapped at a
fluid interface in the regime of small deformations. In many studies, this
interaction has been computed with the ansatz that the actual interface
configuration for the pair is given by the linear superposition of the
interface deformations around the single particles. Here we assess the validity
of this approach and compute the leading term of the effective interaction for
large interparticle separation beyond this so-called superposition
approximation. As an application, we consider the experimentally relevant case
of interface deformations owing to the electrostatic field emanating from
charged colloidal particles. In mechanical isolation, i.e., if the net force
acting on the total system consisting of the particles plus the interface
vanishes, the superposition approximation is actually invalid. The effective
capillary interaction is governed by contributions beyond this approximation
and turns out to be attractive. For sufficiently small surface charges on the
colloids, such that linearization is strictly valid, and at asymptotically
large separations, the effective interaction does not overcome the direct
electrostatic repulsion between the colloidal particles.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 19:42:34 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Jan 2008 11:51:56 GMT"
}
] | 2010-06-18T00:00:00 | [
[
"Dominguez",
"Alvaro",
""
],
[
"Oettel",
"Martin",
""
],
[
"Dietrich",
"Siegfried",
""
]
] |
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