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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.2198 | Jon-Ivar Skullerud | Gert Aarts, Chris Allton, Mehmet Bugrahan Oktay, Mike Peardon,
Jon-Ivar Skullerud | Charmonium at high temperature in two-flavor QCD | 11 pages, 19 figures. v2: expanded discussion and modified
conclusions. One figure changed. To appear in PRD | Phys.Rev.D76:094513,2007 | 10.1103/PhysRevD.76.094513 | TRINLAT-07/04 | hep-lat hep-ph nucl-th | null | We compute charmonium spectral functions in 2-flavor QCD on anisotropic
lattices using the maximum entropy method. Our results suggest that the S-waves
(J/psi and eta_c) survive up to temperatures close to 2Tc, while the P-waves
(chi_c0 and chi_c1) melt away below 1.2Tc.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 17:59:55 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 09:51:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aarts",
"Gert",
""
],
[
"Allton",
"Chris",
""
],
[
"Oktay",
"Mehmet Bugrahan",
""
],
[
"Peardon",
"Mike",
""
],
[
"Skullerud",
"Jon-Ivar",
""
]
] |
0705.2199 | Kuiroukidis | A Kuiroukidis, K Kleidis and D B Papadopoulos | Alfven modes driven non-linearly by metric perturbations in anisotropic
magnetized cosmologies | 7 pages, RevTex, 3 figures ps, accepted for publication to IJMPA | Int.J.Mod.Phys.A22:2197-2209,2007 | 10.1142/S0217751X07036415 | null | gr-qc | null | We consider anisotropic magnetized cosmologies filled with conductive plasma
fluid and study the implications of metric perturbations that propagate
parallel to the ambient magnetic field. It is known that in the first order
(linear) approximation with respect to the amplitude of the perturbations no
electric field and density perturbations arise. However, when we consider the
non-linear coupling of the metric perturbations with their temporal
derivatives, certain classes of solutions can induce steeply increasing in time
electric field perturbations. This is verified both numerically and
analytically. The source of these perturbations can be either high-frequency
quantum vacuum fluctuations, driven by the cosmological pump field, in the
early stages of the evolution of the Universe or astrophysical processes or a
non-linear isotropization process of an initially anisotropic cosmological
spacetime.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 17:49:41 GMT"
}
] | 2010-10-27T00:00:00 | [
[
"Kuiroukidis",
"A",
""
],
[
"Kleidis",
"K",
""
],
[
"Papadopoulos",
"D B",
""
]
] |
0705.2200 | Rodrigo Ferreira Sobreiro | R. F. Sobreiro, V. J. Vasquez Otoya | Effective gravity from a quantum gauge theory in Euclidean space-time | 20 pages; Final version accepted for publication in Class.Quant.Grav | Class.Quant.Grav.24:4937-4953,2007 | 10.1088/0264-9381/24/20/003 | null | hep-th gr-qc | null | We consider a $SO(d)$ gauge theory in an Euclidean $d$-dimensional
space-time, which is known to be renormalizable to all orders in perturbation
theory for $2\le{d}\le4$. Then, with the help of a space-time representation of
the gauge group, the gauge theory is mapped into a curved space-time with
linear connection. Further, in that mapping the gauge field plays the role of
the linear connection of the curved space-time and an effective metric tensor
arises naturally from the mapping. The obtained action, being quadratic in the
Riemann-Christoffel tensor, at a first sight, spoils a gravity interpretation
of the model. Thus, we provide a sketch of a mechanism that breaks the $SO(d)$
color invariance and generates the Einstein-Hilbert term, as well as a
cosmological constant term, allowing an interpretation of the model as a
modified gravity in the Palatini formalism. In that sense, gravity can be
visualized as an effective classical theory, originated from a well defined
quantum gauge theory. We also show that, in the four dimensional case, two
possibilities for particular solutions of the field equations are the de Sitter
and Anti de Sitter space-times.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 17:51:39 GMT"
},
{
"version": "v2",
"created": "Sun, 12 Aug 2007 13:42:00 GMT"
},
{
"version": "v3",
"created": "Tue, 14 Aug 2007 10:31:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sobreiro",
"R. F.",
""
],
[
"Otoya",
"V. J. Vasquez",
""
]
] |
0705.2201 | Peggy Li H.Y. | R. F. Bishop, P. H. Y. Li, R. Darradi, J. Richter | The quantum $J_1$-$J_1'$-$J_2$ spin-1/2 Heisenberg model: Influence of
the interchain coupling on the ground-state magnetic ordering in 2D | 12 pages, 5 figures. Changed minor contents | J. Phys.: Condens. Matter 20 (2008) 255251 | 10.1209/0295-5075/83/47004 | null | cond-mat.str-el | null | We study the phase diagram of the 2D $J_1$-$J_1'$-$J_2$ spin-1/2 Heisenberg
model by means of the coupled cluster method. The effect of the coupling $J_1'$
on the Neel and stripe states is investigated. We find that the quantum
critical points for the Neel and stripe phases increase as the coupling
strength $J_1'$ is increased, and an intermediate phase emerges above the
region at $J_1' \approx 0.6$ when $J_1=1$. We find indications for a quantum
triple point at $J_1' \approx 0.60 \pm 0.03$, $J_2 \approx 0.33 \pm 0.02$ for
$J_1=1$.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:33:13 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 18:06:47 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Mar 2008 20:47:10 GMT"
},
{
"version": "v4",
"created": "Fri, 18 Apr 2008 15:44:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bishop",
"R. F.",
""
],
[
"Li",
"P. H. Y.",
""
],
[
"Darradi",
"R.",
""
],
[
"Richter",
"J.",
""
]
] |
0705.2202 | Aurelian Isar | A. Isar, W. Scheid | Quantum decoherence and classical correlations of the harmonic
oscillator in the Lindblad theory | 24 pages, 8 figures | Physica A 373, 298 (2007) | 10.1016/j.physa.2006.04.065 | null | quant-ph | null | In the framework of the Lindblad theory for open quantum systems we determine
the degree of quantum decoherence and classical correlations of a harmonic
oscillator interacting with a thermal bath. The transition from quantum to
classical behaviour of the considered system is analyzed and it is shown that
the classicality takes place during a finite interval of time. We calculate
also the decoherence time and show that it has the same scale as the time after
which statistical fluctuations become comparable with quantum fluctuations.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 17:59:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Isar",
"A.",
""
],
[
"Scheid",
"W.",
""
]
] |
0705.2203 | Calvin Smith | Calvin J. Smith | An absolute quantum energy inequality for the Dirac field in curved
spacetime | null | Class.Quant.Grav.24:4733-4750,2007 | 10.1088/0264-9381/24/18/012 | null | gr-qc | null | Quantum Weak Energy Inequalities (QWEIs) are results which limit the extent
to which the smeared renormalised energy density of a quantum field can be
negative. On globally hyperbolic spacetimes the massive quantum Dirac field is
known to obey a QWEI in terms of a reference state chosen arbitrarily from the
class of Hadamard states; however, there exist spacetimes of interest on which
state-dependent bounds cannot be evaluated. In this paper we prove the first
QWEI for the massive quantum Dirac field on four dimensional globally
hyperbolic spacetime in which the bound depends only on the local geometry;
such a QWEI is known as an absolute QWEI.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 18:00:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Smith",
"Calvin J.",
""
]
] |
0705.2204 | Yong-Yeon Keum | Yong-Yeon Keum | Probing for Dynamics of Dark-Energy in Mass Varying Neutrinos: Cosmic
Microwave Background Radiation and Large Scale Structure | 12 pages, 8 figures, Present in conferences COSPA-2006, NEPSE-2007
and Yong-Pyung APCTP-2007 | Mod.Phys.Lett.A22:2131-2142,2007 | 10.1142/S0217732307025388 | null | hep-ph | null | We present cosmological perturbation theory in neutrino probe interacting
dark-energy models, and calculate cosmic microwave background anisotropies and
matter power spectrum. In these models, the evolution of the mass of neutrinos
is determined by the quintessence scalar field, which is responsible for the
cosmic acceleration today. We consider several types of scalar field potentials
and put constraints on the coupling parameter between neutrinos and dark
energy. Assuming the flatness of the universe, the constraint we can derive
from the current observation is $\sum m_{\nu} < 0.87 eV$ at the 95 % confidence
level for the sum over three species of neutrinos.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 18:09:52 GMT"
},
{
"version": "v2",
"created": "Tue, 15 May 2007 22:45:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Keum",
"Yong-Yeon",
""
]
] |
0705.2205 | Nir Piterman | Nir Piterman | From Nondeterministic B\"uchi and Streett Automata to Deterministic
Parity Automata | 21 pages. To appear in Logical Methods in Computer Science (LMCS) | Logical Methods in Computer Science, Volume 3, Issue 3 (August 14,
2007) lmcs:1199 | 10.2168/LMCS-3(3:5)2007 | null | cs.LO cs.FL | null | In this paper we revisit Safra's determinization constructions for automata
on infinite words. We show how to construct deterministic automata with fewer
states and, most importantly, parity acceptance conditions. Determinization is
used in numerous applications, such as reasoning about tree automata,
satisfiability of CTL*, and realizability and synthesis of logical
specifications. The upper bounds for all these applications are reduced by
using the smaller deterministic automata produced by our construction. In
addition, the parity acceptance conditions allows to use more efficient
algorithms (when compared to handling Rabin or Streett acceptance conditions).
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 18:08:15 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 13:15:08 GMT"
}
] | 2019-03-14T00:00:00 | [
[
"Piterman",
"Nir",
""
]
] |
0705.2206 | Miguel Ortega | Manuel Barros, Magdalena Caballero and Miguel Ortega | Rotational Surfaces in $\mathbb{L}^3$ and Solutions in the Nonlinear
Sigma Model | PACS: 11.10.Lm; 11.10.Ef; 11.15.-q; 11.30.-j; 02.30.-f; 02.40.-k. 45
pages, 11 figures | Commun.Math.Phys.290:437-477,2009 | 10.1007/s00220-009-0850-0 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Gauss map of non-degenerate surfaces in the three-dimensional Minkowski
space are viewed as dynamical fields of the two-dimensional O(2,1) Nonlinear
Sigma Model. In this setting, the moduli space of solutions with rotational
symmetry is completely determined. Essentially, the solutions are warped
products of orbits of the 1-dimensional groups of isometries and elastic curves
in either a de Sitter plane, a hyperbolic plane or an anti de Sitter plane. The
main tools are the equivalence of the two-dimensional O(2,1) Nonlinear Sigma
Model and the Willmore problem, and the description of the surfaces with
rotational symmetry. A complete classification of such surfaces is obtained in
this paper. Indeed, a huge new family of Lorentzian rotational surfaces with a
space-like axis is presented. The description of this new class of surfaces is
based on a technique of surgery and a gluing process, which is illustrated by
an algorithm.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 18:26:19 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Nov 2008 09:56:52 GMT"
}
] | 2009-07-22T00:00:00 | [
[
"Barros",
"Manuel",
""
],
[
"Caballero",
"Magdalena",
""
],
[
"Ortega",
"Miguel",
""
]
] |
0705.2207 | Poltorak Serguei G | S. G. Poltorak and A. M. Fridman | Using an Assumption about the Monotony of Spiral Arms to Determine the
Orientation Angles of Galaxies | 16 pages, 6 figures, 1 table. submitted to Astronomy Reports
(Astronomicheskii zhurnal), 2007, Vol. 51, No. 6, pp. 460-468 | null | 10.1134/S1063772907060042 | null | astro-ph | null | A method is proposed for the determination of the position and inclination
angles of the plane of a spiral galaxy based on the assumption that every
spiral arm is a monotonic function of the radius versus azimuthal angle. This
method may yield more accurate results than the more commonly employed isophote
method, which is fraught with various drawbacks. The use of the new method is
illustrated by applying it to a sample of 43 objects, and the results agree
well with data from other sources.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 18:11:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Poltorak",
"S. G.",
""
],
[
"Fridman",
"A. M.",
""
]
] |
0705.2208 | Jan Gutowski | U. Gran, J. Gutowski and G. Papadopoulos | IIB backgrounds with five-form flux | 39 pages, typos corrected and references amended | Nucl.Phys.B798:36-71,2008 | 10.1016/j.nuclphysb.2008.01.015 | null | hep-th | null | We investigate all N=2 supersymmetric IIB supergravity backgrounds with
non-vanishing five-form flux. The Killing spinors have stability subgroups
$Spin(7)\ltimes\bR^8$, $SU(4)\ltimes\bR^8$ and $G_2$. In the
$SU(4)\ltimes\bR^8$ case, two different types of geometry arise depending on
whether the Killing spinors are generic or pure. In both cases, the backgrounds
admit a null Killing vector field which leaves invariant the $SU(4)\ltimes
\bR^8$ structure, and an almost complex structure in the directions transverse
to the lightcone. In the generic case, the twist of the vector field is trivial
but the almost complex structure is non-integrable, while in the pure case the
twist is non-trivial but the almost complex structure is integrable and
associated with a relatively balanced Hermitian structure. The $G_2$
backgrounds admit a time-like Killing vector field and two spacelike closed
one-forms, and the seven directions transverse to these admit a co-symplectic
$G_2$ structure. The $Spin(7)\ltimes\bR^8$ backgrounds are pp-waves propagating
in an eight-dimensional manifold with holonomy $Spin(7)$. In addition we show
that all the supersymmetric solutions of simple five-dimensional supergravity
with a time-like Killing vector field, which include the $AdS_5$ black holes,
lift to $SU(4)\ltimes\bR^8$ pure Killing spinor IIB backgrounds. We also show
that the LLM solution is associated with a co-symplectic co-homogeneity one
$G_2$ manifold which has principal orbit $S^3\times S^3$.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 18:14:30 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 23:43:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gran",
"U.",
""
],
[
"Gutowski",
"J.",
""
],
[
"Papadopoulos",
"G.",
""
]
] |
0705.2209 | Robert Cousins | Robert D. Cousins | Annotated Bibliography of Some Papers on Combining Significances or
p-values | v2 has a added info on a few papers including Liptak (1958) and
Lancaster (1961) | null | null | null | physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A question that comes up repeatedly is how to combine the results of two
experiments if all that is known is that one experiment had a n-sigma effect
and another experiment had a m-sigma effect. This question is not well-posed:
depending on what additional assumptions are made, the preferred answer is
different. The note lists some of the more prominent papers on the topic, with
some brief comments and excerpts.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:21:07 GMT"
},
{
"version": "v2",
"created": "Sat, 20 Dec 2008 17:37:18 GMT"
}
] | 2008-12-20T00:00:00 | [
[
"Cousins",
"Robert D.",
""
]
] |
0705.2210 | Keisuke Fujii | D. C. Arogancia, et al | Study in a beam test of the resolution of a Micromegas TPC with standard
readout pads | To be submitted to NIM A, 25 pages | Nucl.Instrum.Meth.A602:403-414,2009 | 10.1016/j.nima.2009.01.014 | null | physics.ins-det | null | The results of a beam test performed at the KEK PS in June 2005 are
presented. Drift properties of an argon-isobutane mixture have been accurately
measured and compared with predictions at magnetic fields between 0 and 1
Tesla. The r.m.s. point resolution of a padrow is compared with simulation and
with an analytical calculation. The fundamental limitations due to detector
geometry and gas properties are reviewed and the measured performances of the
detector are found to be close to this limit. A numerical application to the
case of a Linear Collider TPC is presented.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:05:43 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Arogancia",
"D. C.",
""
]
] |
0705.2211 | Lorenzo Campos Venuti | Lorenzo Campos Venuti and Paolo Zanardi | Quantum critical scaling of the geometric tensors | Typos corrected | Phys. Rev. Lett. 99, 095701 (2007) | 10.1103/PhysRevLett.99.095701 | null | quant-ph | null | Berry phases and the quantum-information theoretic notion of fidelity have
been recently used to analyze quantum phase transitions from a geometrical
perspective. In this paper we unify these two approaches showing that the
underlying mechanism is the critical singular behavior of a complex tensor over
the Hamiltonian parameter space. This is achieved by performing a scaling
analysis of this quantum geometric tensor in the vicinity of the critical
points. In this way most of the previous results are understood on general
grounds and new ones are found. We show that criticality is not a sufficient
condition to ensure superextensive divergence of the geometric tensor, and
state the conditions under which this is possible. The validity of this
analysis is further checked by exact diagonalization of the spin-1/2 XXZ
Heisenberg chain.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 18:40:27 GMT"
},
{
"version": "v2",
"created": "Wed, 16 May 2007 23:22:59 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Venuti",
"Lorenzo Campos",
""
],
[
"Zanardi",
"Paolo",
""
]
] |
0705.2212 | Sebastian Uhlmann | Georg Bergner, Tobias Kaestner, Sebastian Uhlmann, Andreas Wipf | Low-dimensional Supersymmetric Lattice Models | 54 pages, 19 figures, v2: typos corrected, discussion of O(a^4)
corrections improved, two references added, version to appear in Annals of
Physics | AnnalsPhys.323:946-988,2008 | 10.1016/j.aop.2007.06.010 | null | hep-lat hep-th | null | We study and simulate N=2 supersymmetric Wess-Zumino models in one and two
dimensions. For any choice of the lattice derivative, the theories can be made
manifestly supersymmetric by adding appropriate improvement terms corresponding
to discretizations of surface integrals. In one dimension, our simulations show
that a model with the Wilson derivative and the Stratonovitch prescription for
this discretization leads to far better results at finite lattice spacing than
other models with Wilson fermions considered in the literature. In particular,
we check that fermionic and bosonic masses coincide and the unbroken Ward
identities are fulfilled to high accuracy. Equally good results for the
effective masses can be obtained in a model with the SLAC derivative (even
without improvement terms).
In two dimensions we introduce a non-standard Wilson term in such a way that
the discretization errors of the kinetic terms are only of order O(a^2). Masses
extracted from the corresponding manifestly supersymmetric model prove to
approach their continuum values much quicker than those from a model containing
the standard Wilson term. Again, a comparable enhancement can be achieved in a
theory using the SLAC derivative.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:15:09 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Sep 2007 10:35:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bergner",
"Georg",
""
],
[
"Kaestner",
"Tobias",
""
],
[
"Uhlmann",
"Sebastian",
""
],
[
"Wipf",
"Andreas",
""
]
] |
0705.2213 | Aaron T. Steffen | A. T. Steffen, W. N. Brandt, D. M. Alexander, S. C. Gallagher, B. D.
Lehmer | Chandra Stacking Constraints on the Contribution of 24 micron Spitzer
Sources to the Unresolved Cosmic X-ray Background | 5 pages (emulateapj format), 4 figures; submitted to ApJ Letters | null | 10.1086/522046 | null | astro-ph | null | We employ X-ray stacking techniques to examine the contribution from X-ray
undetected, mid-infrared-selected sources to the unresolved, hard (6-8 keV)
cosmic X-ray background (CXB). We use the publicly available, 24 micron Spitzer
Space Telescope MIPS catalogs from the Great Observatories Origins Deep Survey
(GOODS) - North and South fields, which are centered on the 2 Ms Chandra Deep
Field-North and the 1 Ms Chandra Deep Field-South, to identify bright (S_24 >
80 microJy) mid-infrared sources that may be powered by heavily obscured AGNs.
We measure a significant stacked X-ray signal in all of the X-ray bands
examined, including, for the first time, a significant (3.2 sigma) 6-8 keV
stacked X-ray signal from an X-ray undetected source population. We find that
the X-ray-undetected MIPS sources make up about 2% (or less) of the total CXB
below 6 keV, but about 6% in the 6-8 keV band. The 0.5-8 keV stacked X-ray
spectrum is consistent with a hard power-law (Gamma = 1.44 +/- 0.07), with the
spectrum hardening at higher X-ray energies. Our findings show that these
bright MIPS sources do contain obscured AGNs, but are not the primary source of
the unresolved 50% of 6-8 keV CXB. Our study rules out obscured, luminous QSOs
as a significant source of the remaining unresolved CXB and suggests that it
most likely arises from a large population of obscured, high-redshift (z > 1),
Seyfert-luminosity AGNs.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 18:56:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Steffen",
"A. T.",
""
],
[
"Brandt",
"W. N.",
""
],
[
"Alexander",
"D. M.",
""
],
[
"Gallagher",
"S. C.",
""
],
[
"Lehmer",
"B. D.",
""
]
] |
0705.2214 | Dimitris Politis | Dimitris N. Politis | Bagging multiple comparisons from microarray data | null | null | null | null | stat.ME stat.CO | null | The problem of large-scale simultaneous hypothesis testing is re-visited.
Bagging and subagging procedures are put forth with the purpose of improving
the discovery power of the tests. The procedures are implemented in both
simulated and real data. It is shown that bagging and subagging significantly
improve power at the cost of a small increase in false discovery rate with the
proposed `maximum contrast' subagging having an edge over bagging, i.e.,
yielding similar power but significantly smaller false discovery rates.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:16:25 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Politis",
"Dimitris N.",
""
]
] |
0705.2215 | Philipp Diesinger | P.M.Diesinger and D.W.Heermann | The influence of the cylindrical shape of the nucleosomes and H1 defects
on properties of chromatin | null | null | 10.1529/biophysj.107.113902 | null | cond-mat.soft cond-mat.stat-mech q-bio.SC | null | We present a model improving the two-angle model for interphase chromatin
(E2A model). This model takes into account the cylindrical shape of the histone
octamers, the H1 histones in front of the nucleosomes and the vertical distance
$d$ between the in and outgoing DNA strands. Factoring these chromatin features
in, one gets essential changes in the chromatin phase diagram: Not only the
shape of the excluded-volume borderline changes but also the vertical distance
$d$ has a dramatic influence on the forbidden area. Furthermore, we examined
the influence of H1 defects on the properties of the chromatin fiber. Thus we
present two possible strategies for chromatin compaction: The use of very dense
states in the phase diagram in the gaps in the excluded volume borderline or
missing H1 histones which can lead to very compact fibers. The chromatin fiber
might use both of these mechanisms to compact itself at least locally. Line
densities computed within the model coincident with the experimental values.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:17:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Diesinger",
"P. M.",
""
],
[
"Heermann",
"D. W.",
""
]
] |
0705.2216 | Nadine Badr | Nadine Badr | Real interpolation of Sobolev spaces | 30 pages | null | null | null | math.FA math.MG | null | We prove that $W^{1}_{p}$ is an interpolation space between $W^{1}_{p_{1}}$
and $W^{1}_{p_{2}}$ for $p>q_{0}$ and $1\leq p_{1}<p<p_{2}\leq \infty$ on some
classes of manifolds and general metric spaces, where $q_{0}$ depends on our
hypotheses.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:44:31 GMT"
},
{
"version": "v2",
"created": "Wed, 16 May 2007 06:11:09 GMT"
},
{
"version": "v3",
"created": "Tue, 1 Apr 2008 07:18:32 GMT"
}
] | 2008-04-01T00:00:00 | [
[
"Badr",
"Nadine",
""
]
] |
0705.2217 | Michael Galperin | Michael Galperin, Abraham Nitzan, and Mark A. Ratner | Inelastic effects in molecular junctions in the Coulomb and Kondo
regimes: Nonequilibrium equation-of-motion approach | 12 pages, 5 figures | Phys. Rev. B 76, 035301 (2007) | 10.1103/PhysRevB.76.035301 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Inelastic effects in the Coulomb blockade and Kondo regimes of electron
transport through molecular junctions are considered within a simple
nonequilibrium equation-of-motion (EOM) approach. The scheme is
self-consistent, and can qualitatively reproduce the main experimental
observations of vibrational features in Coulomb blockade [H.Park et al., Nature
407, 57 (2000)] and Kondo [L.H.Yu et al., Phys. Rev. Lett. 93, 266802 (2004)]
regimes. Considerations similar to the equilibrium EOM approach by Meir et al.
[Phys. Rev. Lett. 66, 3048 (1991); ibid. 70, 2601 (1993)] are used on the
Keldysh contour to account for the nonequilibrium nature of the junction, and
dressing by appropriate Franck-Condon (FC) factors is used to account for
vibrational features. Results of the equilibrium EOM scheme by Meir et al. are
reproduced in the appropriate limit.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:21:28 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Galperin",
"Michael",
""
],
[
"Nitzan",
"Abraham",
""
],
[
"Ratner",
"Mark A.",
""
]
] |
0705.2218 | C\'assia C. Donato | M A F Gomes, C C Donato, S L Campello, R E de Souza, R Cassia-Moura | Structural properties of crumpled cream layers | 9 pages, 4 figures, accepted in J. Phys. D: Appl. Phys | null | 10.1088/0022-3727/40/12/017 | null | cond-mat.soft | null | The cream layer is a complex heterogeneous material of biological origin
which forms spontaneously at the air-milk interface. Here, it is studied the
crumpling of a single cream layer packing under its own weight at room
temperature in three-dimensional space. The structure obtained in these
circumstances has low volume fraction and anomalous fractal dimensions. Direct
means and noninvasive NMR imaging technique are used to investigate the
internal and external structure of these systems.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:23:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gomes",
"M A F",
""
],
[
"Donato",
"C C",
""
],
[
"Campello",
"S L",
""
],
[
"de Souza",
"R E",
""
],
[
"Cassia-Moura",
"R",
""
]
] |
0705.2219 | Michael Gillon | M. Gillon (1, 2), F. Pont (1), B.-O. Demory (1), F. Mallmann (3), M.
Mayor, T. Mazeh (4), D. Queloz (1), A. Shporer (4), S. Udry (1), C. Vuissoz
(5) ((1) Observatoire de Geneve, Universite de Geneve, Switzerland, (2)
Institut d'Astrophysique et de Geophysique, Universite de Liege, Belgium, (3)
Observatoire Francois-Xavier Bagnoud - OFXB, Switzerland, (4) School of
Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences,
Tel Aviv University, Tel Aviv, Israel, (5) Laboratoire d'Astrophysique, Ecole
Polytechnique Federale de Lausanne (EPFL), Observatoire, Switzerland) | Detection of transits of the nearby hot Neptune GJ 436 b | 4 pages, 3 figures. Accepted for publication in A&A Letters | Astron.Astrophys.472:L13-L16,2007 | 10.1051/0004-6361:20077799 | null | astro-ph | null | This Letter reports on the photometric detection of transits of the
Neptune-mass planet orbiting the nearby M-dwarf star GJ 436. It is by far the
closest, smallest and least massive transiting planet detected so far. Its mass
is slightly larger than Neptune's at M = 22.6 +- 1.9 M_earth. The shape and
depth of the transit lightcurves show that it is crossing the host star disc
near its limb (impact parameter 0.84 +- 0.03) and that the planet size is
comparable to that of Uranus and Neptune, R = 25200 +- 2200 km = 3.95 +- 0.35
R_earth. Its main constituant is therefore very likely to be water ice. If the
current planet structure models are correct, an outer layer of H/He
constituting up to ten percent in mass is probably needed on top of the ice to
account for the observed radius.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:28:58 GMT"
},
{
"version": "v2",
"created": "Wed, 16 May 2007 08:21:09 GMT"
},
{
"version": "v3",
"created": "Sat, 26 May 2007 21:29:44 GMT"
}
] | 2010-03-01T00:00:00 | [
[
"Gillon",
"M.",
""
],
[
"Pont",
"F.",
""
],
[
"Demory",
"B. -O.",
""
],
[
"Mallmann",
"F.",
""
],
[
"Mayor",
"M.",
""
],
[
"Mazeh",
"T.",
""
],
[
"Queloz",
"D.",
""
],
[
"Shporer",
"A.",
""
],
[
"Udry",
"S.",
""
],
[
"Vuissoz",
"C.",
""
]
] |
0705.2220 | Ay\c{s}e \c{S}ahin | Andres del Junco, Ayse A. Sahin | Dye's theorem in the almost continuous category | null | null | null | null | math.DS | null | We prove an almost continuous version of Dye's theorem: any two non-atomic
probability measure preserving homeomorphisms of Polish spaces are almost
continuously orbit equivalent. More precisely they are orbit equivalent by a
map which is defined and continuous on a Polish subset of full measure with an
inverse satisfying the same conditions. This result includes all of the recent
results on almost continuous orbit equivalence. We also deal with the case of
infinite invariant measures.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:39:21 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"del Junco",
"Andres",
""
],
[
"Sahin",
"Ayse A.",
""
]
] |
0705.2221 | C\'assia C. Donato | C. C. Donato, M. A. F. Gomes | Condensation of elastic energy in two-dimensional packing of wire | 4 pages, 4 figures, accepted in Physical Review E | null | 10.1103/PhysRevE.75.066113 | null | cond-mat.stat-mech | null | Forced packing of a long metallic wire injected into a two-dimensional cavity
leads to crushed structures involving a hierarchical cascade of loops with
varying curvature radii. We study the distribution of elastic energy stored in
such systems from experiments, and high-resolution digital techniques. It is
found that the set where the elastic energy of curvature is concentrated has
dimension $D_\mathcal{S} = 1.0 \pm 0.1$, while the set where the mass is
distributed, has dimension $D =1.9 \pm 0.1$.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:35:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Donato",
"C. C.",
""
],
[
"Gomes",
"M. A. F.",
""
]
] |
0705.2222 | Abhay Ashtekar | Abhay Ashtekar | Loop Quantum Gravity: Four Recent Advances and a Dozen Frequently Asked
Questions | 21 pages, to appear in the Proceedings of the 11th Marcel Grossmann
Conference | null | 10.1142/9789812834300_0008 | IGPG-07/5-3 | gr-qc hep-th physics.hist-ph | null | As per organizers' request, my talk at the 11th Marcel Grossmann Conference
consisted of two parts. In the first, I illustrated recent advances in loop
quantum gravity through examples. In the second, I presented an overall
assessment of the status of the program by addressing some frequently asked
questions. This account is addressed primarily to researchers outside the loop
quantum gravity community.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 19:49:53 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Ashtekar",
"Abhay",
""
]
] |
0705.2223 | Mauricio Bellini | Mauricio Bellini (Mar del Plata University - CONICET) | The bang of a white hole in the early universe from a 6D vacuum state:
Origin of astrophysical spectrum | Final version to be published in Eur. Phys. J. C | Eur.Phys.J.C54:483-487,2008 | 10.1140/epjc/s10052-008-0537-2 | null | astro-ph gr-qc hep-th | null | Using a previously introduced model in which the expansion of the universe is
driven by a single scalar field subject to gravitational attraction induced by
a white hole during the expansion (from a 6D vacuum state), we study the origin
of squared inflaton fluctuations spectrum on astrophysical scales.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 22:21:31 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 16:11:31 GMT"
},
{
"version": "v3",
"created": "Mon, 14 Jan 2008 13:50:56 GMT"
},
{
"version": "v4",
"created": "Tue, 29 Jan 2008 19:13:18 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bellini",
"Mauricio",
"",
"Mar del Plata University - CONICET"
]
] |
0705.2224 | Jeetain Mittal | Jeetain Mittal, Jeffrey R. Errington, Thomas M. Truskett | Does confining the hard-sphere fluid between hard walls change its
average properties? | To appear in Journal of Chemical Physics | J. Chem. Phys. 126, 244708 (2007) | 10.1063/1.2748045 | null | cond-mat.soft cond-mat.stat-mech | null | We use grand canonical transition-matrix Monte Carlo and discontinuous
molecular dynamics simulations to generate precise thermodynamic and kinetic
data for the equilibrium hard-sphere fluid confined between smooth hard walls.
These simulations show that the pronounced inhomogeneous structuring of the
fluid normal to the confining walls, often the primary focus of density
functional theory studies, has a negligible effect on many of its average
properties over a surprisingly broad range of conditions. We present one
consequence of this insensitivity to confinement: a simple analytical equation
relating the average density of the confined fluid to that of the bulk fluid
with equal activity. Nontrivial implications of confinement for average fluid
properties do emerge in this system, but only when the fluid is both (i) dense
and (ii) confined to a gap smaller than approximately three particle diameters.
For this limited set of conditions, we find that "in-phase" oscillatory
deviations in excess entropy and self-diffusivity (relative to the behavior of
the bulk fluid at the same average density) occur as a function of gap size.
These paired thermodynamic/kinetic deviations from bulk behavior appear to
reflect the geometric packing frustration that arises when the confined space
cannot naturally accommodate an integer number of particle layers.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:13:01 GMT"
}
] | 2009-11-06T00:00:00 | [
[
"Mittal",
"Jeetain",
""
],
[
"Errington",
"Jeffrey R.",
""
],
[
"Truskett",
"Thomas M.",
""
]
] |
0705.2225 | Duncan Farrah | Duncan Farrah (Cornell), Mark Lacy (Caltech), Robert Priddey
(University of Hertfordshire), Colin Borys (University of Toronto), Jose
Afonso (Lisbon Observatory) | Evidence that FeLoBALs may signify the transition between an
ultraluminous infrared galaxy and a quasar | 12 pages, two figures, two tables. ApJ Letters, accepted | null | 10.1086/519492 | null | astro-ph | null | We present mid/far-infrared photometry of nine FeLoBAL QSOs, taken using the
Spitzer space telescope. All nine objects are extremely bright in the infrared,
with rest-frame 1-1000 micron luminosities comparable to those of Ultraluminous
Infrared Galaxies. Furthermore, a significant fraction of the infrared emission
from many, and possibly all of the sample is likely to arise from star
formation, with star formation rates of order several hundred solar masses per
year. We combine these results with previous work to propose that FeLoBALs mark
galaxies and QSOs in which an extremely luminous starburst is approaching its
end, and in which a rapidly accreting supermassive black hole is in the last
stages of casting off its dust cocoon. FeLoBAL signatures in high redshift QSOs
and galaxies may thus be an efficient way of selecting sources at a critical
point in their evolution.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:00:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Farrah",
"Duncan",
"",
"Cornell"
],
[
"Lacy",
"Mark",
"",
"Caltech"
],
[
"Priddey",
"Robert",
"",
"University of Hertfordshire"
],
[
"Borys",
"Colin",
"",
"University of Toronto"
],
[
"Afonso",
"Jose",
"",
"Lisbon Observatory"
]
] |
0705.2226 | Duncan Farrah | D. Farrah (Cornell), C. J. Lonsdale (Caltech and UCSD), C. Borys
(Toronto), F. Fang (Caltech), I. Waddington (Sussex), S. Oliver (Sussex), M.
Rowan-Robinson (Imperial College London), T. Babbedge (Imperial College
London), D. Shupe (Caltech), M. Polletta (UCSD), H. E. Smith (UCSD), J.
Surace (Caltech) | Ultraluminous Infrared Galaxies at 1.5<z<3 occupy dark matter haloes of
mass ~6x10^13 solar masses | ASP conference series. To appear in the conference proceedings for
"At the edge of the Universe", Sintra, Portugal, October 2006. Six pages, one
figure | null | null | null | astro-ph | null | We present measurements of the spatial clustering of ultraluminous infrared
galaxies in two redshift intervals, 1.5<z<2.0 and 2<z<3. Both samples cluster
strongly, with r_0=14.40+/-1.99 h^-1 Mpc for the 2<z<3 sample, and
r_0=9.40+/-2.24 h^-1 Mpc for the 1.5<z<2.0 sample, making them among the most
biased galaxies at these epochs. These clustering amplitudes are consistent
with both populations residing in dark matter haloes with masses of ~6x10^13
solar masses. We infer that a minimum dark matter halo mass is an important
factor for all forms of luminous, obscured activity in galaxies at z>1.
Adopting plausible models for the growth of DM haloes with redshift, then the
haloes hosting the 2<z<3 sample will likely host the richest clusters of
galaxies at z=0, whereas the haloes hosting the 1.5<z<2.0 sample will likely
host poor to rich clusters at z=0.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:00:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Farrah",
"D.",
"",
"Cornell"
],
[
"Lonsdale",
"C. J.",
"",
"Caltech and UCSD"
],
[
"Borys",
"C.",
"",
"Toronto"
],
[
"Fang",
"F.",
"",
"Caltech"
],
[
"Waddington",
"I.",
"",
"Sussex"
],
[
"Oliver",
"S.",
"",
"Sussex"
],
[
"Rowan-Robinson",
"M.",
"",
"Imperial College London"
],
[
"Babbedge",
"T.",
"",
"Imperial College\n London"
],
[
"Shupe",
"D.",
"",
"Caltech"
],
[
"Polletta",
"M.",
"",
"UCSD"
],
[
"Smith",
"H. E.",
"",
"UCSD"
],
[
"Surace",
"J.",
"",
"Caltech"
]
] |
0705.2227 | Kurt Jacobs | Benjamin D. Greenbaum, Kurt Jacobs, Bala Sundaram | Conditions for the Quantum to Classical Transition: Trajectories vs.
Phase Space Distributions | 8 pages, 2 eps figures | Phys. Rev. E 76, 036213 (2007) | 10.1103/PhysRevE.76.036213 | null | quant-ph | null | We contrast two sets of conditions that govern the transition in which
classical dynamics emerges from the evolution of a quantum system. The first
was derived by considering the trajectories seen by an observer (dubbed the
``strong'' transition) [Bhattacharya, et al., Phys. Rev. Lett. 85: 4852
(2000)], and the second by considering phase-space densities (the ``weak''
transition) [Greenbaum, et al., Chaos 15, 033302 (2005)]. On the face of it
these conditions appear rather different. We show, however, that in the
semiclassical regime, in which the action of the system is large compared to
$\hbar$, and the measurement noise is small, they both offer an essentially
equivalent local picture. Within this regime, the weak conditions dominate
while in the opposite regime where the action is not much larger than Planck's
constant, the strong conditions dominate.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:00:29 GMT"
},
{
"version": "v2",
"created": "Sun, 9 Mar 2008 00:38:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Greenbaum",
"Benjamin D.",
""
],
[
"Jacobs",
"Kurt",
""
],
[
"Sundaram",
"Bala",
""
]
] |
0705.2228 | Yousaf Mahmood Butt | Yousaf Butt | The Answer is Blowing in the Wind | null | Nature 446:986-987,2007 | 10.1038/446986a | null | astro-ph | null | A 'News & Views' article -- no abstract.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:47:38 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Butt",
"Yousaf",
""
]
] |
0705.2229 | Matthew Valeriote Dr. | Emil Kiss, Matthew Valeriote | On tractability and congruence distributivity | null | Logical Methods in Computer Science, Volume 3, Issue 2 (June 8,
2007) lmcs:1005 | 10.2168/LMCS-3(2:6)2007 | null | cs.CC cs.LO | null | Constraint languages that arise from finite algebras have recently been the
object of study, especially in connection with the Dichotomy Conjecture of
Feder and Vardi. An important class of algebras are those that generate
congruence distributive varieties and included among this class are lattices,
and more generally, those algebras that have near-unanimity term operations. An
algebra will generate a congruence distributive variety if and only if it has a
sequence of ternary term operations, called Jonsson terms, that satisfy certain
equations.
We prove that constraint languages consisting of relations that are invariant
under a short sequence of Jonsson terms are tractable by showing that such
languages have bounded relational width.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:01:32 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Jun 2007 12:26:50 GMT"
}
] | 2015-07-01T00:00:00 | [
[
"Kiss",
"Emil",
""
],
[
"Valeriote",
"Matthew",
""
]
] |
0705.2230 | Jonas Fransson | J. Fransson | Detection of exchange interaction in STM measurements through Fanolike
interference effects | 9 pages, 3 figures, submitted: in addition to the results published
in Phys. Rev. B, 75, 153309 (2007), this paper contains a more thorough
discussion on the used transport formalism, studies of asymmetric couplings
to the substrate, and discussion of non-resonant levels. The non-resonant
case is related to spin-dependent tunneling | Phys. Rev. B, 76, 045416 (2007) | 10.1103/PhysRevB.76.045416 | null | cond-mat.mes-hall | null | We address Fano-like interference effects in scanning tunneling microscopy
(STM) measurements of nanoscale systems, e.g. two-level systems. Common for
these systems is that second order tunneling contributions give rise to
interference effects that cause suppressed transmission through the system for
certain energies. The suppressed transmission is measurable either in the
differential conductance or in the bias voltage derivative thereof.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:06:32 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 21:36:13 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Fransson",
"J.",
""
]
] |
0705.2231 | Athol Kemball | Athol J. Kemball | Stellar masers, circumstellar envelopes, and supernova remnants | 16 pages, 2 figures, 2 tables: based on a review talk presented at
IAU Symposium 242: Astrophysical masers and their environments, held at Alice
Springs (Australia), March 12-16, 2007 | null | 10.1017/S1743921307013063 | null | astro-ph | null | This paper reviews recent advances in the study or circumstellar masers and
masers found toward supernova remnants. The review is organized by science
focus area, including the astrophysics of extended stellar atmospheres, stellar
mass-loss processes and outflows, late-type evolved stellar evolution, stellar
maser excitation and chemistry, and the use of stellar masers as independent
distance estimators. Masers toward supernova remnants are covered separately.
Recent advances and open future questions in this field are explored.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:51:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kemball",
"Athol J.",
""
]
] |
0705.2232 | Lars Mattsson | Lars Mattsson, Susanne Hoefner and Falk Herwig | Mass Loss Evolution and the Formation of Detached Shells around TP-AGB
Stars | 16 pages, 15 figures. Accepted for publication in Astronomy &
Astrophysics | A&A 470, 339 - 352 (2007) | 10.1051/0004-6361:20066368 | null | astro-ph | null | The origin of the so called 'detached shells' around AGB stars is not fully
understood, but two common hypotheses state that these shells form either
through the interaction of distinct wind phases or an eruptive mass loss
associated with a He-shell flash. We present a model of the formation of
detached shells around thermal pulse asymptotic giant branch (TP-AGB) stars,
based on detailed modelling of mass loss and stellar evolution, leading to a
combination of eruptive mass loss and wind interaction.
The purpose of this paper is first of all to connect stellar evolution with
wind and mass loss evolution and demonstrate its consistency with observations,
but also to show how thin detached shells around TP-AGB stars can be formed.
Previous attempts to link mass loss evolution with the formation of detached
shells were based on approximate prescriptions for the mass loss and have not
included detailed modelling of the wind formation as we do here. (abridged)
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:15:21 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Mattsson",
"Lars",
""
],
[
"Hoefner",
"Susanne",
""
],
[
"Herwig",
"Falk",
""
]
] |
0705.2233 | Elias C. Vagenas | Saurya Das, Sean P. Robinson, Elias C. Vagenas | Gravitational anomalies: a recipe for Hawking radiation | 7 pages; This essay received an "Honorable Mention" in the 2007 Essay
Competition of the Gravity Research Foundation; (v2) Short comments and
references added; (v3) Minor revisions and updated references to agree with
published version | Int.J.Mod.Phys.D17:533-539,2008 | 10.1142/S0218271808012218 | null | hep-th astro-ph gr-qc | null | We explore the method of Robinson and Wilczek for deriving the Hawking
temperature of a black hole. In this method, the Hawking radiation restores
general covariance in an effective theory of near-horizon physics which
otherwise exhibits a gravitational anomaly at the quantum level. The method has
been shown to work for broad classes of black holes in arbitrary spacetime
dimensions. These include static black holes, accreting or evaporating black
holes, charged black holes, rotating black holes, and even black rings. In the
case of charged and rotating black holes, the expected super-radiant current is
also reproduced.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 04:34:30 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 04:47:07 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Mar 2008 16:44:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Das",
"Saurya",
""
],
[
"Robinson",
"Sean P.",
""
],
[
"Vagenas",
"Elias C.",
""
]
] |
0705.2234 | Justin F. Vazquez-Poritz | James T. Liu, H. Lu, C.N. Pope, Justin F. Vazquez-Poritz | New supersymmetric solutions of N=2, D=5 gauged supergravity with
hyperscalars | Latex 3 times, 42 pages | JHEP 0710:093,2007 | 10.1088/1126-6708/2007/10/093 | MCTP-07-13, MIFP-07-14 | hep-th | null | We construct new supersymmetric solutions, including AdS bubbles, in an N=2
truncation of five-dimensional N=8 gauged supergravity. This particular
truncation is given by N=2 gauged supergravity coupled to two vector multiples
and three incomplete hypermultiplets, and was originally investigated in the
context of obtaining regular AdS bubble geometries with multiple active
R-charges. We focus on cohomogeneity-one solutions corresponding to objects
with two equal angular momenta and up to three independent R-charges.
Curiously, we find a new set of zero and negative mass solitons asymptotic to
AdS_5/Z_k, for k \ge 3, which are everywhere regular without closed timelike
curves.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 17:31:12 GMT"
}
] | 2009-10-07T00:00:00 | [
[
"Liu",
"James T.",
""
],
[
"Lu",
"H.",
""
],
[
"Pope",
"C. N.",
""
],
[
"Vazquez-Poritz",
"Justin F.",
""
]
] |
0705.2235 | Tshilidzi Marwala | S. Chakraverty, T. Marwala, Pallavi Gupta and Thando Tettey | Response Prediction of Structural System Subject to Earthquake Motions
using Artificial Neural Network | 18 pages | null | null | null | cs.AI | null | This paper uses Artificial Neural Network (ANN) models to compute response of
structural system subject to Indian earthquakes at Chamoli and Uttarkashi
ground motion data. The system is first trained for a single real earthquake
data. The trained ANN architecture is then used to simulate earthquakes with
various intensities and it was found that the predicted responses given by ANN
model are accurate for practical purposes. When the ANN is trained by a part of
the ground motion data, it can also identify the responses of the structural
system well. In this way the safeness of the structural systems may be
predicted in case of future earthquakes without waiting for the earthquake to
occur for the lessons. Time period and the corresponding maximum response of
the building for an earthquake has been evaluated, which is again trained to
predict the maximum response of the building at different time periods. The
trained time period versus maximum response ANN model is also tested for real
earthquake data of other place, which was not used in the training and was
found to be in good agreement.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:29:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chakraverty",
"S.",
""
],
[
"Marwala",
"T.",
""
],
[
"Gupta",
"Pallavi",
""
],
[
"Tettey",
"Thando",
""
]
] |
0705.2236 | Tshilidzi Marwala | Tshilidzi Marwala, Thando Tettey and Snehashish Chakraverty | Fault Classification using Pseudomodal Energies and Neuro-fuzzy
modelling | 8 pages, In Proceedings of the Asia-Pacific Workshop on Structural
Health Monitoring, Yokohama, Japan, 2006 | null | null | null | cs.AI | null | This paper presents a fault classification method which makes use of a
Takagi-Sugeno neuro-fuzzy model and Pseudomodal energies calculated from the
vibration signals of cylindrical shells. The calculation of Pseudomodal
Energies, for the purposes of condition monitoring, has previously been found
to be an accurate method of extracting features from vibration signals. This
calculation is therefore used to extract features from vibration signals
obtained from a diverse population of cylindrical shells. Some of the cylinders
in the population have faults in different substructures. The pseudomodal
energies calculated from the vibration signals are then used as inputs to a
neuro-fuzzy model. A leave-one-out cross-validation process is used to test the
performance of the model. It is found that the neuro-fuzzy model is able to
classify faults with an accuracy of 91.62%, which is higher than the previously
used multilayer perceptron.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:34:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Marwala",
"Tshilidzi",
""
],
[
"Tettey",
"Thando",
""
],
[
"Chakraverty",
"Snehashish",
""
]
] |
0705.2237 | Pramod Kumar | Pramod Kumar, K. G. Suresh, A. K. Nigam and S. K. Malik | Magnetic, magneto-thermal and magneto-transport properties in
SmMn2Si2-xGex compounds | null | null | 10.1063/1.2828179 | null | cond-mat.mtrl-sci | null | The effect of Ge substitution for Si in SmMMn2Si2-xGex compounds has been
studied. The Sm ordering temperature is found to be much larger in the compound
with x=2, as compared to the compounds with x=0 and 1. The increase in the
intra layer Mn-Mn distance is found to be responsible for this increase. Among
these three compounds, SmMn2Ge2 is found to show re-entrant ferromagnetism at
low temperatures. The magnetic contribution to the heat capacity has been found
in all the three compounds. The splitting of the ground state multiplet has
been estimated by fitting the magnetic part of the heat capacity data using the
Schottky formula. The isothermal magnetic entropy change is found to remain the
same for x=0 and 1, but decrease in the compound with x=2, though the nature of
magnetic transition changes from second order to first order, as x is increased
from 0 to 2. The electrical resistivity increases with Ge concentration. The
excess resistivity in the antiferromagnetic region has been calculated.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:40:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kumar",
"Pramod",
""
],
[
"Suresh",
"K. G.",
""
],
[
"Nigam",
"A. K.",
""
],
[
"Malik",
"S. K.",
""
]
] |
0705.2238 | Debora Sijacki | Debora Sijacki (1), Volker Springel (1), Tiziana Di Matteo (2), and
Lars Hernquist (3) ((1) MPA, (2) CMU, (3) Harvard-CfA) | A unified model for AGN feedback in cosmological simulations of
structure formation | 27 pages, 17 figures, minor revisions, MNRAS accepted. High
resolution version of the paper is available at
http://www.mpa-garching.mpg.de/~deboras/paper/agn_unified.pdf | Mon.Not.Roy.Astron.Soc.380:877-900,2007 | 10.1111/j.1365-2966.2007.12153.x | null | astro-ph | null | We discuss a numerical model for black hole growth and its associated
feedback processes that for the first time allows cosmological simulations of
structure formation to self-consistently follow the build up of the cosmic
population of galaxies and active galactic nuclei. Our model assumes that seed
black holes are present at early cosmic epochs at the centres of forming halos.
We then track their growth from gas accretion and mergers with other black
holes in the course of cosmic time. For black holes that are active, we
distinguish between two distinct modes of feedback, depending on the black hole
accretion rate itself. Black holes that accrete at high rates are assumed to be
in a `quasar regime', where we model their feedback by thermally coupling a
small fraction of their bolometric luminosity to the surrounding gas. For black
holes with low accretion rates, we conjecture that most of their feedback
occurs in mechanical form, where AGN-driven bubbles are injected into a gaseous
environment. Using our new model, we carry out TreeSPH cosmological simulations
on the scales of individual galaxies to those of massive galaxy clusters, both
for isolated systems and for cosmological boxes. We demonstrate that our model
produces results for the black hole and stellar mass densities in broad
agreement with observational constraints. We find that the black holes
significantly influence the evolution of their host galaxies, changing their
star formation history, their amount of cold gas, and their colours. Also, the
properties of intracluster gas are affected strongly by the presence of massive
black holes in the cores of galaxy clusters, leading to shallower metallicity
and entropy profiles, and to a suppression of strong cooling flows. [Abridged]
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:17:41 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 13:05:16 GMT"
}
] | 2009-09-28T00:00:00 | [
[
"Sijacki",
"Debora",
"",
"MPA"
],
[
"Springel",
"Volker",
"",
"MPA"
],
[
"Di Matteo",
"Tiziana",
"",
"CMU"
],
[
"Hernquist",
"Lars",
"",
"Harvard-CfA"
]
] |
0705.2239 | Alex Koshelev | A.E. Koshelev | Electrodynamics of Josephson vortex lattice in high-temperature
superconductors | 10 pages, 7 figures, to be published in Phys.Rev.B, supplementary
animations of oscillating local electric field can be found at
http://mti.msd.anl.gov/homepages/koshelev/projects/JPRinJVL/Nz2vc0_32vab6_0Anim.htm | Phys. Rev. B 76, 054525 (2007) | 10.1103/PhysRevB.76.054525 | null | cond-mat.supr-con | null | We studied response of the Josephson vortex lattice in layered
superconductors to the high-frequency c-axis electric field. We found a simple
relation connecting the dynamic dielectric constant with the perturbation of
the superconducting phase, induced by oscillating electric field. Numerically
solving equations for the oscillating phases, we computed the frequency
dependences of the loss function at different magnetic fields, including
regions of both dilute and dense Josephson vortex lattices. The overall
behavior is mainly determined by the c-axis and in-plane dissipation
parameters, which is inversely proportional to the anisotropy. The cases of
weak and strong dissipation are realized in
$\mathrm{Bi_{2}Sr_{2}CaCu_{2}O_{x}}$ and underdoped $\mathrm{YBa_{2}Cu_{3}
O_{x}}$ correspondingly. The main feature of the response is the
Josephson-plasma-resonance peak. In the weak-dissipation case additional
satellites appear in the dilute regime mostly in the higher-frequency region
due to excitation of the plasma modes with the wave vectors set by the lattice
structure. In the dense-lattice limit the plasma peak moves to higher frequency
and its intensity rapidly decreases, in agreement with experiment and
analytical theory. Behavior of the loss function at low frequencies is well
described by the phenomenological theory of vortex oscillations. In the case of
very strong in-plane dissipation an additional peak in the loss function
appears below the plasma frequency. Such peak has been observed experimentally
in underdoped $\mathrm{YBa_{2}Cu_{3} O_{x}}$. It is caused by frequency
dependence of in-plane contribution to losses rather then a definite mode of
phase oscillations.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:43:54 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 21:59:04 GMT"
},
{
"version": "v3",
"created": "Thu, 2 Aug 2007 22:54:56 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Koshelev",
"A. E.",
""
]
] |
0705.2240 | Ameila Stutz | Amelia M. Stutz, John H. Bieging, George H. Rieke, Yancy L. Shirley,
Zoltan Balog, Karl D. Gordon, Elizabeth M. Green, Jocelyn Keene, Brandon C.
Kelly, Mark Rubin, Michael W. Werner | Spitzer observations of a 24 micron shadow: Bok Globule CB190 | 16 pages, 13 figures, accepted for publication in ApJ | Astrophys.J.665:466-477,2007 | 10.1086/519488 | null | astro-ph | null | We present Spitzer observations of the dark globule CB190 (L771). We observe
a roughly circular 24 micron shadow with a 70 arcsec radius. The extinction
profile of this shadow matches the profile derived from 2MASS photometry at the
outer edges of the globule and reaches a maximum of ~32 visual magnitudes at
the center. The corresponding mass of CB190 is ~10 Msun. Our 12CO and 13CO J =
2-1 data over a 10 arcmin X 10 arcmin region centered on the shadow show a
temperature ~10 K. The thermal continuum indicates a similar temperature for
the dust. The molecular data also show evidence of freezeout onto dust grains.
We estimate a distance to CB190 of 400 pc using the spectroscopic parallax of a
star associated with the globule. Bonnor-Ebert fits to the density profile, in
conjunction with this distance, yield xi_max = 7.2, indicating that CB190 may
be unstable. The high temperature (56 K) of the best fit Bonnor-Ebert model is
in contradiction with the CO and thermal continuum data, leading to the
conclusion that the thermal pressure is not enough to prevent free-fall
collapse. We also find that the turbulence in the cloud is inadequate to
support it. However, the cloud may be supported by the magnetic field, if this
field is at the average level for dark globules. Since the magnetic field will
eventually leak out through ambipolar diffusion, it is likely that CB190 is
collapsing or in a late pre-collapse stage.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:45:32 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Stutz",
"Amelia M.",
""
],
[
"Bieging",
"John H.",
""
],
[
"Rieke",
"George H.",
""
],
[
"Shirley",
"Yancy L.",
""
],
[
"Balog",
"Zoltan",
""
],
[
"Gordon",
"Karl D.",
""
],
[
"Green",
"Elizabeth M.",
""
],
[
"Keene",
"Jocelyn",
""
],
[
"Kelly",
"Brandon C.",
""
],
[
"Rubin",
"Mark",
""
],
[
"Werner",
"Michael W.",
""
]
] |
0705.2241 | D. J. Miller | Peter Athron and D. J. Miller | A New Measure of Fine Tuning | 25 pages, some colour figures; version accepted for publication | Phys.Rev.D76:075010,2007 | 10.1103/PhysRevD.76.075010 | null | hep-ph | null | The solution to fine tuning is one of the principal motivations for Beyond
the Standard Model (BSM) Studies. However constraints on new physics indicate
that many of these BSM models are also fine tuned (although to a much lesser
extent). To compare these BSM models it is essential that we have a reliable,
quantitative measure of tuning. We review the measures of tuning used in the
literature and propose an alternative measure. We apply this measure to several
toy models and the Minimal Supersymmetric Standard Model.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:47:03 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 16:34:51 GMT"
},
{
"version": "v3",
"created": "Thu, 8 Nov 2007 17:33:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Athron",
"Peter",
""
],
[
"Miller",
"D. J.",
""
]
] |
0705.2242 | Joel N. Bregman | Joel N. Bregman and Jimmy A. Irwin (University of Michigan) | The Search for Million Degree Gas Through The NVII Hyperfine Line | 27 total pages; 16 figures; Accepted for publication in The
Astrophysical Journal | Astrophys.J.666:139-146,2007 | 10.1086/520033 | null | astro-ph | null | Gas in the million degree range occurs in a variety of astronomical
environments, and it may be the main component of the elusive missing baryons
at low redshift. The NVII ion is found in this material and it has a hyperfine
spin-flip transition with a rest frequency of 53.042 GHz, which can be observed
for z > 0.1, when it is shifted into a suitably transparent radio band. We used
the 42-48 GHz spectrometer on the Green Bank Telescope to search for both
emission and absorption from this NVII transmission. For absorption studies,
3C273, 3C 279, 3C 345, and 4C+39.25 were observed but no feature were seen
above the 5 sigma level. For emission line studies, we observed Abell 1835,
Abell 2390 and the star-forming galaxy PKS 1345+12, but no features were seen
exceeding 5 sigma. We examine whether the strongest emission feature, in Abell
2390 (3.7 sigma), and the strongest absorption feature, toward 4C+39.25 (3.8
sigma), might be expected from theoretical models. The emission feature would
require ~1E10 Msolar of 1E6 K gas, which is inconsistent with X-ray limits for
the O VII Kalpha line, so it is unlikely to be real. The NVII absorption
feature requires a NVII column of 6E16 cm^-2, higher than model predictions by
at least an order of magnitude, which makes it inconsistent with model
expectations. The individual observations were less than 1 hr in length, so for
lengthy observations, we show that NVII absorption line observations can begin
to be useful in in the search for hot intergalactic gas.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:47:48 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bregman",
"Joel N.",
"",
"University of Michigan"
],
[
"Irwin",
"Jimmy A.",
"",
"University of Michigan"
]
] |
0705.2243 | Geraldo A. Barbosa | Geraldo A. Barbosa | Secure sharing of random bits over the Internet | 7 pages, 3 figures. A single typo was corrected at the end of the
manuscript: (K0/d)!-> K0!/d | null | null | null | quant-ph | null | Although one-time pad encrypted files can be sent through Internet channels,
the need for renewing shared secret keys have made this method unpractical.
This work presents a scheme to turn practical the fast sharing of random keys
over arbitrary Internet channels. Starting with a shared secret key sequence of
length K_0 the users end up with a secure new sequence K >> K_0. Using these
sequences for posteriori message encryption the legitimate users have absolute
security control without the need for third parties. Additionally, the security
level does not depend on the unproven difficulty of factoring numbers in
primes. In the proposed scheme a fast optical random source generates random
bits and noise for key renewals. The transmitted signals are recorded signals
that carries both the random binary signals to be exchanged and physical noise
that cannot be eliminated by the attacker. These signals allow amplification
over the Internet network without degrading security. The proposed system is
also secure against a-posteriori known-plaintext attack on the key.
Information-theoretic analysis is presented and bounds for secure operation are
quantitatively determined.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 20:48:22 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 11:45:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Barbosa",
"Geraldo A.",
""
]
] |
0705.2244 | Rebecca Shafee | Rebecca Shafee, Ramesh Narayan, Jeffrey E. McClintock | Viscous Torque and Dissipation in the Inner Region of a Thin Accretion
Disk: Implications for Measuring Black Hole Spin | 32 pages, 10 figures; accepted by ApJ | null | 10.1086/527346 | null | astro-ph | null | We consider a simple Newtonian model of a steady accretion disk around a
black hole. The model is based on height-integrated hydrodynamic equations,
alpha-viscosity, and a pseudo-Newtonian potential that results in an innermost
stable circular orbit (ISCO) that closely approximates the one predicted by GR.
We find that the hydrodynamic models exhibit increasing deviations from the
standard disk model of Shakura & Sunyaev as disk thickness H/R or the value of
alpha increases. The latter is an analytical model in which the viscous torque
is assumed to vanish at the ISCO. We consider the implications of the results
for attempts to estimate black hole spin by using the standard disk model to
fit continuum spectra of black hole accretion disks. We find that the error in
the spin estimate is quite modest so long as H/R < 0.1 and alpha < 0.2. At
worst the error in the estimated value of the spin parameter is 0.1 for a
non-spinning black hole; the error is much less for a rapidly spinning hole. We
also consider the density and disk thickness contrast between the gas in the
disk and that inside the ISCO. The contrast needs to be large if black hole
spin is to be successfully estimated by fitting the relativistically-broadened
X-ray line profile of fluorescent iron emission from reflection off an
accretion disk. In our hydrodynamic models, the contrast in density and
thickness is low when H/R>0.1, sugesting that the iron line technique may be
most reliable in extemely thin disks. We caution that these results have been
obtained with a viscous hydrodynamic model and need to be confirmed with MHD
simulations of radiatively cooled thin disks.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:25:03 GMT"
},
{
"version": "v2",
"created": "Sat, 20 Oct 2007 23:02:54 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Dec 2007 07:07:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shafee",
"Rebecca",
""
],
[
"Narayan",
"Ramesh",
""
],
[
"McClintock",
"Jeffrey E.",
""
]
] |
0705.2245 | Saharian | A.A. Saharian, A.L. Mkhitaryan | Wightman function and vacuum densities for a Z_2-symmetric thick brane
in AdS spacetime | 25 pages, 6 figures, discussion added | JHEP0708:063,2007 | 10.1088/1126-6708/2007/08/063 | null | hep-th | null | Positive frequency Wightman function, vacuum expectation values of the field
square and the energy-momentum tensor induced by a Z_{2}-symmetric brane with
finite thickness located on (D+1)- dimensional AdS background are evaluated for
a massive scalar field with general curvature coupling parameter. For the
general case of static plane symmetric interior structure the expectation
values in the region outside the brane are presented as the sum of free AdS and
brane induced parts. For a conformally coupled massless scalar the brane
induced part in the vacuum energy-momentum tensor vanishes. In the limit of
strong gravitational fields the brane induced parts are exponentially
suppressed for points not too close to the brane boundary. As an application of
general results a special model is considered in which the geometry inside the
brane is a slice of the Minkowski spacetime orbifolded along the direction
perpendicular to the brane. For this model the Wightman function, vacuum
expectation values of the field square and the energy-momentum tensor inside
the brane are evaluated as well and their behavior is discussed in various
asymptotic regions of the parameters. It is shown that for both minimally and
conformally coupled scalar fields the interior vacuum forces acting on the
brane boundaries tend to decrease the brane thickness.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 21:05:53 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 15:40:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Saharian",
"A. A.",
""
],
[
"Mkhitaryan",
"A. L.",
""
]
] |
0705.2246 | Valery V. Kravtsov | Valery V. Kravtsov (Instituto de Astronomia, UCN, Antofagasta, Chile;
Sternberg Astronomical Institute, MSU, Moscow, Russia) | Old Metal-rich Globular Cluster Populations: Peak Color and Peak
Metallicity Trends with Mass of Host Spheroids | 5 pages, 1 figure, accepted for publication in Astronomische
Nachrichten | null | 10.1002/asna.200610754 | null | astro-ph | null | We address the problem of the factors contributing to a peak color trend of
old metal-rich globular cluster (MRGC) populations with mass of their hosts,
early-type galaxies and spheroidal subsystems of spiral ones (spheroids). The
color-mass trend is often converted to a metallicity-mass trend under the
assumption that age effects are small or negligible. While direct estimates of
the ages of MRGC populations neither can rule out nor reliably support the
populations' age trend, key data on timing of the formation of spheroids and
other indirect evidence imply it in the sense: the more massive spheroid the
older on average its MRGC population. We show that the contribution of an
allowable age trend of the MRGC populations to their peak color trend can
achieve up to ~50 % or so. In this event the comparable value of the color
trend, ~30 %, is due to alpha-element ratio systematic variations of the order
of Delta[alpha/Fe] ~ 0.1 to 0.2 dex because of a correlation between the
[alpha/Fe] ratios and age. Hence a systematic variation of exactly [Fe/H]
ratios may turn out to be less significant among the contributors, and its
range many times lower, i.e. of the order of Delta[Fe/H] ~ 0.1 or even none,
than the corresponding range deduced by assuming no age trend.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 21:13:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kravtsov",
"Valery V.",
"",
"Instituto de Astronomia, UCN, Antofagasta, Chile;\n Sternberg Astronomical Institute, MSU, Moscow, Russia"
]
] |
0705.2247 | Jorgen Sjolin | CDF Collaboration | Limits on Anomalous Triple Gauge Couplings in ppbar Collisions at
sqrt{s}=1.96 TeV | 7 pages, 3 figures. Submitted to Phys. Rev. D | Phys.Rev.D76:111103,2007 | 10.1103/PhysRevD.76.111103 | FERMILAB-PUB-07-123-E | hep-ex | null | We present a search for anomalous triple gauge couplings (ATGC) in WW and WZ
boson production. The boson pairs are produced in ppbar collisions at
sqrt{s}=1.96 TeV, and the data sample corresponds to 350 pb-1 of integrated
luminosity collected with the CDF II detector at the Fermilab Tevatron. In this
search one W decays to leptons, and the other boson (W or Z) decays
hadronically. Combining with a previously published CDF measurement of Wgamma
boson production yields ATGC limits of -0.18 < lambda < 0.17 and -0.46 < Delta
kappa < 0.39 at the 95% confidence level, using a cut-off scale Lambda=1.5 TeV.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 22:59:49 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Aug 2007 21:38:08 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"CDF Collaboration",
"",
""
]
] |
0705.2248 | Sandra Malvezzi | The FOCUS Collaboration: J.M. Link, et al., M.R. Pennington | Dalitz plot analysis of the D+ to K-pi+pi+ decay in the FOCUS experiment | 21 pages, 10 figures, to be submitted to Phys.Lett.B | Phys.Lett.B653:1-11,2007 | 10.1016/j.physletb.2007.06.070 | FERMILAB PUB-07-127E | hep-ex | null | Using data collected by the high energy photoproduction experiment FOCUS at
Fermilab we performed a Dalitz plot analysis of the Cabibbo favored decay D+ to
K-pi+ pi+. This study uses 53653 Dalitz-plot events with a signal fraction of ~
97%, and represents the highest statistics, most complete Dalitz plot analysis
for this channel. Results are presented and discussed using two different
formalisms. The first is a simple sum of Breit--Wigner functions with freely
fitted masses and widths. It is the model traditionally adopted and serves as
comparison with the already published analyses. The second uses a K-matrix
approach for the dominant S-wave, in which the parameters are fixed by first
fitting Kpi scattering data and continued to threshold by Chiral Perturbation
Theory. We show that the Dalitz plot distribution for this decay is consistent
with the assumption of two body dominance of the final state interactions and
the description of these interactions is in agreement with other data on the
Kpi final state.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 21:35:58 GMT"
}
] | 2012-08-03T00:00:00 | [
[
"The FOCUS Collaboration",
"",
""
],
[
"Link",
"J. M.",
""
],
[
"Pennington",
"M. R.",
""
]
] |
0705.2249 | Evgeny Ivanov | Evgeny Ivanov | Supersymmetrizing Landau Models | 16 pages, Talk at the International Workshop on Classical and Quantum
Integrable Systems, BLTP, JINR, Dubna, January 22--25, 2007 | Theor.Math.Phys.154:349-361,2008 | 10.1007/s11232-008-0032-9 | null | hep-th | null | This is an overview of recent progress in constructing and studying
superextensions of the Landau problem of a quantum particle on a plane in the
uniform magnetic field, as well as of its Haldane's $S^2$ generalization ({\tt
hep-th/0311159, hep-th/0404108, hep-th/0510019, hep-th/0612300}). The main
attention is paid to the planar super Landau models which are invariant under
the inhomogeneous supergroup ISU(1|1), a contraction of the supergroup SU(2|1),
and provide minimal superextensions of the original Landau model. Their common
notable feature is the presence of a hidden dynamical worldline N=2
supersymmetry. It exists at the classical and quantum levels and is revealed
most naturally while passing to the new invariant inner products in the space
of quantum states in order to make the norms of all states positive. For one of
the planar models, the superplane Landau model, we present an off-shell
worldline superfield formulation in which the N=2 supersymmetry gets manifest.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 22:02:04 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 09:43:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ivanov",
"Evgeny",
""
]
] |
0705.2250 | Daniel Jafferis | Daniel L. Jafferis | Topological Quiver Matrix Models and Quantum Foam | 28 pages, 5 figures | null | null | null | hep-th | null | We study the matrix models that describe the BPS bound states of branes
arising from the quiver picture of the derived category. These theories have a
topological partition function that localizes to the Euler character of the
anti-ghost bundle over the classical BPS moduli space. We examine the effective
internal geometry of D6/D2 bound states in the local vertex geometry, using BPS
0-brane probes. The Kahler blowups of the Calabi-Yau that we find utilizing
these quiver theories are a realization of A-model quantum foam in the full IIA
theory.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 16:12:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Jafferis",
"Daniel L.",
""
]
] |
0705.2251 | Oded Regev | Oded Regev | Chaos and complexity in astrophysics | to appear in the Springer "Encyclopedia of Complexity and System
Science". The full text is at
http://physics.technion.ac.il/~regev/ccastro.pdf | null | 10.1063/1.2784688 | null | astro-ph | null | Methods and techniques of the theory of nonlinear dynamical systems and
patterns can be useful in astrophysical applications. Some works on the
subjects of dynamical astronomy, stellar pulsation and variability, as well as
spatial complexity in extended systems, in which such approaches have already
been utilized, are reviewed. Prospects for future directions in applications of
this kind are outlined.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 11:39:33 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Regev",
"Oded",
""
]
] |
0705.2252 | Carlos Augusto Romero Filho | M. A. S. Cruz, F. Dahia and C. Romero | Inducing charges and currents from extra dimensions | 8 pages. Accepted for publication in Modern Physics Letters A | Mod.Phys.Lett.A23:197-203,2008 | 10.1142/S0217732308023839 | null | gr-qc | null | In a particular variant of Kaluza-Klein theory, the so-called induced-matter
theory (IMT), it is shown that any configuration of matter may be geometrically
induced from a five-dimensional vacuum space. By using a similar approach we
show that any distribution of charges and currents may also be induced from a
five-dimensional vacuum space. Whereas in the case of IMT the geometry is
Riemannian and the fundamental equations are the five-dimensional Einstein
equations in vacuum, here we consider a Minkowskian geometry and the
five-dimensional Maxwell equations in vacuum.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 22:21:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cruz",
"M. A. S.",
""
],
[
"Dahia",
"F.",
""
],
[
"Romero",
"C.",
""
]
] |
0705.2253 | Roberto Oliveira | Roberto Imbuzeiro Oliveira | On the convergence to equilibrium of Kac's random walk on matrices | Published in at http://dx.doi.org/10.1214/08-AAP550 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2009, Vol. 19, No. 3, 1200-1231 | 10.1214/08-AAP550 | IMS-AAP-AAP550 | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Kac's random walk on $n$-dimensional rotation matrices, where
each step is a random rotation in the plane generated by two randomly picked
coordinates. We show that this process converges to the Haar measure on
$\mathit{SO}(n)$ in the $L^2$ transportation cost (Wasserstein) metric in
$O(n^2\ln n)$ steps. We also prove that our bound is at most a $O(\ln n)$
factor away from optimal. Previous bounds, due to Diaconis/Saloff-Coste and
Pak/Sidenko, had extra powers of $n$ and held only for $L^1$ transportation
cost. Our proof method includes a general result of independent interest, akin
to the path coupling method of Bubley and Dyer. Suppose that $P$ is a Markov
chain on a Polish length space $(M,d)$ and that for all $x,y\in M$ with
$d(x,y)\ll1$ there is a coupling $(X,Y)$ of one step of $P$ from $x$ and $y$
(resp.) that contracts distances by a $(\xi+o(1))$ factor on average. Then the
map $\mu\mapsto\mu P$ is $\xi$-contracting in the transportation cost metric.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 22:42:57 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 02:28:00 GMT"
},
{
"version": "v3",
"created": "Wed, 11 Jun 2008 23:10:51 GMT"
},
{
"version": "v4",
"created": "Mon, 10 Aug 2009 08:28:36 GMT"
}
] | 2009-08-10T00:00:00 | [
[
"Oliveira",
"Roberto Imbuzeiro",
""
]
] |
0705.2254 | Alexander Zhidenko | Alexander Zhidenko | Quasi-normal modes for black hole solutions unknown in analytical form | 3 pages, 1 figure, RevTeX. Talk to be given at the seminar of Russian
Gravitational Society | null | null | null | gr-qc | null | We review the papers [1-3]. We discuss possibilities of studying the
quasi-normal modes of black holes that are not known in an analytical form.
Such black holes appear as solutions in various theoretical models and real
astrophysical approximations when one takes into account the black hole
neighborhood.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 22:51:09 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Zhidenko",
"Alexander",
""
]
] |
0705.2255 | Mamdouh Wanas | M.I. Wanas | Torsion Energy | 7 pages, LaTeX file | null | null | null | gr-qc hep-th math.DG | null | In the present work, torsion energy is defined. Its law of conservation is
given. It is shown that this type of energy gives rise to a repulsive force
which can be used to interpret supernovae type Ia observations, and
consequently the accelerating expansion of the Universe. This interpretation is
a pure geometric one and is a direct application of the geometrization
philosophy. Torsion energy can also be used to solve other problems of General
Relativity especially the singularity problem.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 23:11:03 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Wanas",
"M. I.",
""
]
] |
0705.2256 | Line Hjortsh{\o}j Pedersen | L. H. Pedersen and C. Rangan | Controllability and universal three-qubit quantum computation with
trapped electron states | 4 pages, 1 figure. Typos corrected. The original publication is
available at http://www.springerlink.com | null | 10.1007/s11128-007-0070-5 | null | quant-ph | null | We show how to control and perform universal three-qubit quantum computation
with trapped electron quantum states. The three qubits are the electron spin,
and the first two quantum states of the cyclotron and axial harmonic
oscillators. We explicitly show how the universal gates can be performed. As an
example of a non-trivial quantum algorithm, we outline the implementation of
the Deutsch-Jozsa algorithm in this system.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 23:20:13 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 12:16:44 GMT"
}
] | 2008-02-20T00:00:00 | [
[
"Pedersen",
"L. H.",
""
],
[
"Rangan",
"C.",
""
]
] |
0705.2257 | Alejandro Cabrera | Alejandro Cabrera | Some geometric features of Berry's phase | No figures, refs added, minor changes | null | null | null | math-ph math.MP quant-ph | null | In this letter, we elaborate on the identification and construction of the
differential geometric elements underlying Berry's phase. Berry bundles are
built generally from the physical data of the quantum system under study. We
apply this construction to typical and recently investigated systems presenting
Berry's phase to explore their geometric features.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 23:23:24 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Jun 2007 22:48:39 GMT"
}
] | 2007-06-11T00:00:00 | [
[
"Cabrera",
"Alejandro",
""
]
] |
0705.2258 | Siew-Phang Ng | Siew-Phang Ng, Nobuchika Okada | Dark Matter in Gauge Mediation from Emergent Supersymmetry | 14 pages, 4 figures | JHEP 0709:040,2007 | 10.1088/1126-6708/2007/09/040 | null | hep-ph astro-ph | null | We investigated the viability of neutralino dark matter in the gauge
mediation from emergent supersymmetry proposal. In this proposal, supersymmetry
is broken at Planck scale and consequently, the gravitino is superheavy and
completely decouples from the low energy theory. Squarks and sleptons obtain
their soft masses dominantly through gauge mediation with other mechanisms
highly suppressed. The lightest supersymmetric partner, in contrast to
traditional gauge mediation, is a neutralino which is also a dark matter
candidate. By explicit calculation of the low energy spectra, the parameter
space was constrained using the WMAP observed relic density of dark matter,
LEP2 Higgs mass bounds, collider bounds on supersymmetric partners and exotic
B-meson decays. We found that the model has intriguing hybrid features such as
a nearly gauge-mediated spectrum (the exception being the superheavy gravitino)
but with a dominant mSUGRA-like bino-stau coannihilation channel and at large
$\tan \beta$, A-resonance-like annihilation.
| [
{
"version": "v1",
"created": "Tue, 15 May 2007 23:32:41 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Ng",
"Siew-Phang",
""
],
[
"Okada",
"Nobuchika",
""
]
] |
0705.2259 | Hugo Garcia-Compean | Laura Sanchez, Imelda Galaviz, Hugo Garcia-Compean | Deformation Quantization of Relativistic Particles in Electromagnetic
Fields | 43 pages, no figures, harmac file | Int.J.Mod.Phys.A23:1757-1790,2008 | 10.1142/S0217751X08039360 | CINVESTAV-FIS-07/15 | hep-th | null | The Weyl-Wigner-Moyal formalism for Dirac second class constrained systems
has been proposed recently as the deformation quantization of Dirac bracket. In
this paper, after a brief review of this formalism, it is applied to the case
of the relativistic free particle. Within this context, the Stratonovich-Weyl
quantizer, Weyl correspondence, Moyal $\star$-product and Wigner function in
the constrained phase space are obtained. The recent Hamiltonian treatment for
constrained systems, whose constraints depend explicitly on time, are used to
perform the deformation quantization of the relativistic free charged particle
in an arbitrary electromagnetic background. Finally, the system consisting of a
charged particle interacting with a dynamical Maxwell field is quantized in
this context.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 00:18:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sanchez",
"Laura",
""
],
[
"Galaviz",
"Imelda",
""
],
[
"Garcia-Compean",
"Hugo",
""
]
] |
0705.2260 | Zhendong Wang | Zhendong Wang, Hongbo Zhao, Sumit Mazumdar | pi-Electron theory of transverse optical excitons in semiconducting
single-walled carbon nanotubes | 5 pages, 3 figures. to appear in Physical Review B | Phys. Rev. B 76, 115431 (2007) | 10.1103/PhysRevB.76.115431 | null | cond-mat.mtrl-sci | null | We present a quantitative theory of optical absorption polarized transverse
to the tube axes in semiconducting single-walled carbon nanotubes. Transverse
optical absorption in semiconducting single-walled carbon nanotubes is to an
exciton state that is strongly blueshifted, relative to the two lowest
longitudinal excitons, by electron-electron interactions. The binding energy of
the transverse exciton is considerably smaller than those of the longitudinal
excitons. Electron-electron interactions also reduce the relative oscillator
strength of the transverse optical absorption. Our theoretical results are in
excellent agreement with recent experimental measurements in four chiral
nanotubes.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 00:27:58 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 18:09:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Zhendong",
""
],
[
"Zhao",
"Hongbo",
""
],
[
"Mazumdar",
"Sumit",
""
]
] |
0705.2261 | Xiao-Gang Wen | Tiago C. Ribeiro, Xiao-Gang Wen | Electromagnetic response of high-Tc superconductors -- the slave-boson
and doped-carrier theories | 12 pages, RevTeX4, homepage http://dao.mit.edu/~wen | null | 10.1103/PhysRevB.77.144526 | null | cond-mat.str-el cond-mat.supr-con | null | We evaluate the doping dependence of the quasiparticle current and low
temperature superfluid density in two slave-particle theories of the tt't''J
model -- the slave-boson theory and doped-carrier theory. In the slave-boson
theory, the nodal quasiparticle current renormalization factor $\alpha$
vanishes proportionally to the zero temperature superfluid density $\rho_S(0)$;
however, we find that away from the $\rho_S(0) \to 0$ limit $\alpha$ displays a
much weaker doping dependence than $\rho_S(0)$. A similar conclusion applies to
the doped-carrier theory, which differentiates the nodal and antinodal regions
of momentum space. Due to its momentum space anisotropy, the doped-carrier
theory enhances the value of $\alpha$ in the hole doped regime, bringing it to
quantitative agreement with experiments, and reproduces the asymmetry between
hole and electron doped cuprate superconductors. Finally, we use the
doped-carrier theory to predict a specific experimental signature of local
staggered spin correlations in doped Mott insulator superconductors which, we
propose, should be observed in STM measurements of underdoped high-Tc
compounds. This experimental signature distinguishes the doped-carrier theory
from other candidate mean-field theories of high-Tc superconductors, like the
slave-boson theory and the conventional BCS theory.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 01:26:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ribeiro",
"Tiago C.",
""
],
[
"Wen",
"Xiao-Gang",
""
]
] |
0705.2262 | Panagiotis Stinis | Dror Givon, Panagiotis Stinis, and Jonathan Weare | Variance reduction for particle filters of systems with time-scale
separation | Changed content, added examples and references | null | null | LBNL-62141 | math.NA math.ST stat.CO stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a particle filter construction for a system that exhibits
time-scale separation. The separation of time-scales allows two simplifications
that we exploit: i) The use of the averaging principle for the dimensional
reduction of the system needed to solve for each particle and ii) the
factorization of the transition probability which allows the
Rao-Blackwellization of the filtering step. Both simplifications can be
implemented using the coarse projective integration framework. The resulting
particle filter is faster and has smaller variance than the particle filter
based on the original system. The method is tested on a multiscale stochastic
differential equation and on a multiscale pure jump diffusion motivated by
chemical reactions.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 00:46:09 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Dec 2007 01:41:34 GMT"
},
{
"version": "v3",
"created": "Wed, 4 Jun 2008 21:41:48 GMT"
}
] | 2008-06-05T00:00:00 | [
[
"Givon",
"Dror",
""
],
[
"Stinis",
"Panagiotis",
""
],
[
"Weare",
"Jonathan",
""
]
] |
0705.2263 | Graham Denham | Graham Denham | A note on De Concini and Procesi's curious identity | 4 pages | null | null | null | math.RT math.CO | null | We give a short, case-free and combinatorial proof of de Concini and
Procesi's formula for the volume of the simplicial cone spanned by the simple
roots of any finite root system. The argument presented here also extends their
formula to include the non-crystallographic root systems.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 00:51:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Denham",
"Graham",
""
]
] |
0705.2264 | Xiaoguang Wang | Lijun Song, Xiaoguang Wang, Dong Yan, and Zhong-Sheng Pu | Entanglement conditions for tripartite systems via indeterminacy
relations | 6 pages | null | 10.1088/0953-4075/41/1/015505 | null | quant-ph | null | Based on the S-R indeterminacy relations in conjugation with the partial
transposition, we derive a class of inequalities for detecting entanglement in
several tripartite systems, including bosonic, SU(2), and SU(1,1) systems.
These inequalities are in general stronger than those based on the usual
Heisenberg relations for detecting entanglement. We also discuss the reduction
from SU(2) and SU(1,1) to bosonic systems and the generalization to
multipartite case.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 04:37:43 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 12:05:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Song",
"Lijun",
""
],
[
"Wang",
"Xiaoguang",
""
],
[
"Yan",
"Dong",
""
],
[
"Pu",
"Zhong-Sheng",
""
]
] |
0705.2265 | Matthew Cornick | Matthew Cornick, Brian Hunt, Edward Ott, Michael F. Schatz | Estimating the State of Large Spatiotemporally Chaotic Systems | 4 pages, 4 figures | null | null | null | nlin.CD | null | Data assimilation refers to the process of obtaining an estimate of a
system's state using a model for the system's time evolution and a time series
of measurements that are possibly noisy and incomplete. However, for practical
reasons, the high dimensionality of large spatiotemporally chaotic systems
prevents the use of classical data assimilation techniques. Here, via numerical
computations on the paradigmatic example of large aspect ratio Rayleigh-Benard
convection, we demonstrate the applicability of a recently developed data
assimilation method designed to circumvent this difficulty. In addition, we
describe extensions of the algorithm for estimating unknown system parameters.
Our results suggest the potential usefulness of our data assimilation technique
to a broad class of situations in which there is spatiotemporally chaotic
behavior.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 19:32:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cornick",
"Matthew",
""
],
[
"Hunt",
"Brian",
""
],
[
"Ott",
"Edward",
""
],
[
"Schatz",
"Michael F.",
""
]
] |
0705.2266 | Jeyhan Kartaltepe | J. S. Kartaltepe, D. B. Sanders, N. Z. Scoville, D. Calzetti, P.
Capak, A. Koekemoer, B. Mobasher, T. Murayama, M. Salvato, S. S. Sasaki, and
Y. Taniguchi | Evolution of the Frequency of Luminous (\geq L_V*) Close Galaxy Pairs at
z < 1.2 in the COSMOS Field | 22 pages including 4 figures and 2 tables. Accepted for publication
in the ApJS COSMOS special issue. For the high resolution version of figure
4, see: http://www.ifa.hawaii.edu/~jeyhan/pairs/ | null | 10.1086/519953 | null | astro-ph | null | We measure the fraction of luminous galaxies in pairs at projected
separations of 5-20 kpc out to z=1.2 in the COSMOS field using ACS images and
photometric redshifts derived from an extensive multiwavelength dataset.
Analysis of a complete sample of 106,188 galaxies more luminous than M_V=-19.8
(~ L_V*) in the redshift range 0.1 < z < 1.2 yields 1,749 galaxy pairs. These
data are supplemented by a local z=0-0.1 value for the galaxy pair fraction
derived from the Sloan Digital Sky Survey (SDSS). After statistically
correcting the COSMOS pair sample for chance line-of-sight superpositions, the
evolution in the pair fraction is fit by a power law \propto (1+z)^{n=3.1 \pm
0.1}. If this strongly evolving pair fraction continues out to higher redshift,
~ 50% of all luminous galaxies at z ~ 2 are in close pairs. This clearly
signifies that galaxy mergers are a very significant and possibly dominant
mechanism for galaxy evolution during the epoch of galaxy formation at z=1 to
3.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 01:26:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kartaltepe",
"J. S.",
""
],
[
"Sanders",
"D. B.",
""
],
[
"Scoville",
"N. Z.",
""
],
[
"Calzetti",
"D.",
""
],
[
"Capak",
"P.",
""
],
[
"Koekemoer",
"A.",
""
],
[
"Mobasher",
"B.",
""
],
[
"Murayama",
"T.",
""
],
[
"Salvato",
"M.",
""
],
[
"Sasaki",
"S. S.",
""
],
[
"Taniguchi",
"Y.",
""
]
] |
0705.2267 | Jianqiang Zhao | Jianqiang Zhao | Double Shuffle Relations of Euler Sums | 15 page. Corrected some minor typos | J. Reine Angew. Math. 639 (2010), 223-233 | null | null | math.NT | null | In this paper we shall develop a theory of (extended) double shuffle
relations of Euler sums which generalizes that of multiple zeta values (see
Ihara, Kaneko and Zagier, \emph{Derivation and double shuffle relations for
multiple zeta values}. Compos. Math. \textbf{142} (2)(2006), 307--338). After
setting up the general framework we provide some numerical evidence for our two
main conjectures. At the end we shall prove the following long standing
conjecture: for every positive integer n
$$\zeta(\{3\}^n)=8^n\zeta(\{\ol2,1\}^n).$$ The main idea is to use the double
shuffle relations and the distribution relation. This particular distribution
relation doesn't follow from the double shuffle relation in general. But we
believe it does follow from the extended double shuffle relations.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 01:52:09 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 20:31:56 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Jun 2007 04:10:41 GMT"
},
{
"version": "v4",
"created": "Tue, 10 Jul 2007 15:00:41 GMT"
},
{
"version": "v5",
"created": "Mon, 23 Jul 2007 10:18:46 GMT"
}
] | 2010-08-16T00:00:00 | [
[
"Zhao",
"Jianqiang",
""
]
] |
0705.2268 | Nadine Badr | Nadine Badr | Real interpoaltion of Sobolev spaces associated to a weight | 25 pages | null | null | null | math.FA math.MG | null | We study the interpolation property of Sobolev spaces of order 1 denoted by
$W^{1}_{p,V}$, arising from Schr\"{o}dinger operators with positive potential.
We show that for $1\leq p_1<p<p_2<q_{0}$ with $p>s_0$, $W^{1}_{p,V}$ is a real
interpolation space between $W_{p_1,V}^{1}$ and $W_{p_2,V}^{1}$ on some classes
of manifolds and Lie groups. The constants $s_{0}, q_{0}$ depend on our
hypotheses.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 13:33:39 GMT"
},
{
"version": "v2",
"created": "Sat, 12 Apr 2008 14:31:26 GMT"
}
] | 2008-04-12T00:00:00 | [
[
"Badr",
"Nadine",
""
]
] |
0705.2269 | Tiziana Di Matteo | Tiziana Di Matteo (CMU), Joerg Colberg (CMU), Volker Springel (MPA),
Lars Hernquist (CfA) and Debora Sijacki (MPA) | Direct cosmological simulations of the growth of black holes and
galaxies | 22 pages, 17 figures, submitted to ApJ | null | 10.1086/524921 | null | astro-ph | null | We investigate the coupled formation and evolution of galaxies and their
embedded supermassive black holes using state-of-the-art hydrodynamic
simulations of cosmological structure formation. For the first time, we
self-consistently follow the dark matter dynamics, radiative gas cooling, star
formation, as well as black hole growth and associated feedback processes,
starting directly from initial conditions appropriate for the LambdaCDM
cosmology. Our modeling of the black hole physics is based on an approach we
have developed in simulations of isolated galaxy mergers. Here we examine: (i)
the predicted global history of black hole mass assembly (ii) the evolution of
the local black hole-host mass correlations and (iii) the conditions that allow
rapid growth of the first quasars, and the properties of their hosts and
descendants today. We find a total black hole mass density in good agreement
with observational estimates. The black hole accretion rate density peaks at
lower redshift and evolves more strongly at high redshift than the star
formation rate density, but the ratio of black hole to stellar mass densities
shows only a moderate evolution at low redshifts. We find strong correlations
between black hole masses and properties of the stellar systems, agreeing well
with the measured local M_BH-sigma and M_BH -M_* relationships, but also
suggesting (dependent on the mass range) a weak evolution with redshift in the
normalization and the slope. Our simulations also produce massive black holes
at high redshift, due to extended periods of exponential growth in regions that
collapse early and exhibit strong gas inflows. These first supermassive BH
systems however are not necessarily the most massive ones today, since they are
often overtaken in growth by quasars that form later. (abridged)
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 01:44:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Di Matteo",
"Tiziana",
"",
"CMU"
],
[
"Colberg",
"Joerg",
"",
"CMU"
],
[
"Springel",
"Volker",
"",
"MPA"
],
[
"Hernquist",
"Lars",
"",
"CfA"
],
[
"Sijacki",
"Debora",
"",
"MPA"
]
] |
0705.2270 | Wei Dai | Wei Dai, Brian Rider and Youjian Liu | Multi-Access MIMO Systems with Finite Rate Channel State Feedback | 10 pages. In Proc. Allerton Conf. on Commun., Control, and Computing,
2005 | null | null | null | cs.IT math.IT | null | This paper characterizes the effect of finite rate channel state feedback on
the sum rate of a multi-access multiple-input multiple-output (MIMO) system. We
propose to control the users jointly, specifically, we first choose the users
jointly and then select the corresponding beamforming vectors jointly. To
quantify the sum rate, this paper introduces the composite Grassmann manifold
and the composite Grassmann matrix. By characterizing the distortion rate
function on the composite Grassmann manifold and calculating the logdet
function of a random composite Grassmann matrix, a good sum rate approximation
is derived. According to the distortion rate function on the composite
Grassmann manifold, the loss due to finite beamforming decreases exponentially
as the feedback bits on beamforming increases.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 02:09:48 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Dai",
"Wei",
""
],
[
"Rider",
"Brian",
""
],
[
"Liu",
"Youjian",
""
]
] |
0705.2271 | Jing-Ling Chen | Jing-Ling Chen, and Ming-Guang Hu | Bell Inequality Based on Peres-Horodecki Criterion | 4 pages, 2 figures. Revised version. Title and Figures changed,
references added | null | null | null | quant-ph | null | We established a physically utilizable Bell inequality based on the
Peres-Horodecki criterion. The new quadratic probabilistic Bell inequality
naturally provides us a necessary and sufficient way to test all entangled
two-qubit or qubit-qutrit states including the Werner states and the maximally
entangled mixed states.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 02:19:53 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 06:39:04 GMT"
}
] | 2007-06-22T00:00:00 | [
[
"Chen",
"Jing-Ling",
""
],
[
"Hu",
"Ming-Guang",
""
]
] |
0705.2272 | Wei Dai | Wei Dai, Youjian Liu and Brian Rider | Quantization Bounds on Grassmann Manifolds of Arbitrary Dimensions and
MIMO Communications with Feedback | In IEEE Global Telecommunications Conference (GLOBECOM), 2005 | null | null | null | cs.IT math.IT | null | This paper considers the quantization problem on the Grassmann manifold with
dimension n and p. The unique contribution is the derivation of a closed-form
formula for the volume of a metric ball in the Grassmann manifold when the
radius is sufficiently small. This volume formula holds for Grassmann manifolds
with arbitrary dimension n and p, while previous results are only valid for
either p=1 or a fixed p with asymptotically large n. Based on the volume
formula, the Gilbert-Varshamov and Hamming bounds for sphere packings are
obtained. Assuming a uniformly distributed source and a distortion metric based
on the squared chordal distance, tight lower and upper bounds are established
for the distortion rate tradeoff. Simulation results match the derived results.
As an application of the derived quantization bounds, the information rate of a
Multiple-Input Multiple-Output (MIMO) system with finite-rate channel-state
feedback is accurately quantified for arbitrary finite number of antennas,
while previous results are only valid for either Multiple-Input Single-Output
(MISO) systems or those with asymptotically large number of transmit antennas
but fixed number of receive antennas.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 02:23:38 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Dai",
"Wei",
""
],
[
"Liu",
"Youjian",
""
],
[
"Rider",
"Brian",
""
]
] |
0705.2273 | Wei Dai | Wei Dai, Youjian Liu, Brian Rider and Vincent K.N. Lau | On the Information Rate of MIMO Systems with Finite Rate Channel State
Feedback and Power On/Off Strategy | In Proc. IEEE International Symposium on Information Theory (ISIT),
2005 | null | null | null | cs.IT math.IT | null | This paper quantifies the information rate of multiple-input multiple-output
(MIMO) systems with finite rate channel state feedback and power on/off
strategy. In power on/off strategy, a beamforming vector (beam) is either
turned on (denoted by on-beam) with a constant power or turned off. We prove
that the ratio of the optimal number of on-beams and the number of antennas
converges to a constant for a given signal-to-noise ratio (SNR) when the number
of transmit and receive antennas approaches infinity simultaneously and when
beamforming is perfect. Based on this result, a near optimal strategy, i.e.,
power on/off strategy with a constant number of on-beams, is discussed. For
such a strategy, we propose the power efficiency factor to quantify the effect
of imperfect beamforming. A formula is proposed to compute the maximum power
efficiency factor achievable given a feedback rate. The information rate of the
overall MIMO system can be approximated by combining the asymptotic results and
the formula for power efficiency factor. Simulations show that this
approximation is accurate for all SNR regimes.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 02:32:37 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Dai",
"Wei",
""
],
[
"Liu",
"Youjian",
""
],
[
"Rider",
"Brian",
""
],
[
"Lau",
"Vincent K. N.",
""
]
] |
0705.2274 | Wei Dai | Wei Dai, Youjian (Eugene) Liu and Brian Rider | How Many Users should be Turned On in a Multi-Antenna Broadcast Channel? | In Conf. on Info. Sciences and Systems (CISS), 2007 | null | null | null | cs.IT math.IT | null | This paper considers broadcast channels with L antennas at the base station
and m single-antenna users, where each user has perfect channel knowledge and
the base station obtains channel information through a finite rate feedback.
The key observation of this paper is that the optimal number of on-users (users
turned on), say s, is a function of signal-to-noise ratio (SNR) and other
system parameters. Towards this observation, we use asymptotic analysis to
guide the design of feedback and transmission strategies. As L, m and the
feedback rates approach infinity linearly, we derive the asymptotic optimal
feedback strategy and a realistic criterion to decide which users should be
turned on. Define the corresponding asymptotic throughput per antenna as the
spatial efficiency. It is a function of the number of on-users s, and
therefore, s should be appropriately chosen. Based on the above asymptotic
results, we also develop a scheme for a system with finite many antennas and
users. Compared with other works where s is presumed constant, our scheme
achieves a significant gain by choosing the appropriate s. Furthermore, our
analysis and scheme is valid for heterogeneous systems where different users
may have different path loss coefficients and feedback rates.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 02:48:00 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Dai",
"Wei",
"",
"Eugene"
],
[
"Youjian",
"",
"",
"Eugene"
],
[
"Liu",
"",
""
],
[
"Rider",
"Brian",
""
]
] |
0705.2275 | Yoshio Koide | Yoshio Koide | S_4 Flavor Symmetry Embedded into SU(3) and Lepton Masses and Mixing | 12 pages, no figure, to appear on JHEP | JHEP 0708:086,2007 | 10.1088/1126-6708/2007/08/086 | null | hep-ph | null | Based on an assumption that an S_4 flavor symmetry is embedded into SU(3), a
lepton mass matrix model is investigated. A Frogatt-Nielsen type model is
assumed, and the flavor structures of the masses and mixing are caused by VEVs
of SU(2)_L-singlet scalars \phi_u and \phi_d which are nonets (8+1) of the
SU(3) flavor symmetry, and which are broken into 2+3+3' and 1 of S_4. If we
require the invariance under the transformation (\phi^{(8)},\phi^{(1)}) \to
(-\phi^{(8)},+\phi^{(1)}) for the superpotential of the nonet field
\phi^{(8+1)}, the model leads to a beautiful relation for the charged lepton
masses. The observed tribimaximal neutrino mixing is understood by assuming two
SU(3) singlet right-handed neutrinos \nu_R^{(\pm)} and an SU(3) triplet scalar
\chi.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 03:16:43 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 08:23:30 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Jun 2007 02:55:01 GMT"
},
{
"version": "v4",
"created": "Mon, 20 Aug 2007 05:29:52 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Koide",
"Yoshio",
""
]
] |
0705.2276 | Hai Long Ma | BES Collaboration | Measurements of the observed cross sections for $e^+e^- \to$ light
hadrons at $\sqrt{s}=$ 3.773 and 3.650 GeV | 9 pages, 5 figures | Phys.Lett.B650:111-118,2007 | 10.1016/j.physletb.2007.05.011 | null | hep-ex | null | Using the data sets of 17.3 pb$^{-1}$ collected at $\sqrt{s}=$ 3.773 GeV and
6.5 pb$^{-1}$ collected at $\sqrt{s}=$ 3.650 GeV with the BESII detector at the
BEPC collider, we have measured the observed cross sections for 18 exclusive
light hadron final states produced in $e^+e^-$ annihilation at the two energy
points.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 03:45:00 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"BES Collaboration",
"",
""
]
] |
0705.2277 | Qi-Shu Yan | Sukanta Dutta, Kaoru Hagiwara, Qi-Shu Yan, Kentaroh Yoshida | Constraints on the electroweak chiral Lagrangian from the precision data | One more reference is included. Typoes are removed. The version to
appear at Nucl. Phys. B | Nucl.Phys.B790:111-137,2008 | 10.1016/j.nuclphysb.2007.08.017 | null | hep-ph | null | In the framework of the effective field theory method, we use the
experimental data and the perturbative unitarity bounds to determine the values
and uncertainty of all the 11 chiral coefficients ($\al_i, i=0, ..., 10$) of
the standard electroweak chiral Lagrangian. Up to linear terms in $\al_i$, we
provide the one-loop renormalization group equations of all the chiral
coefficients, which are calculated in the Feynman-'t Hooft gauge using the
modified minimal subtraction scheme. With the improved renormalization group
equations to sum over the logarithmic corrections, we analyze the current
experimental uncertainty of oblique correction parameters, $S(\Lambda)$ and
$T(\Lambda)$. We find that, due to the large uncertainty in the triple
gauge-boson coupling measurements, the parameter space of positive $S(\Lambda)$
for $\Lambda > 1$ TeV is still allowed by the current experimental data.
$T(\Lambda)$ tends to increase with $\Lambda$ even in the presence of the
operators that contribute to the triple and quartic gauge-boson couplings.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 04:21:07 GMT"
},
{
"version": "v2",
"created": "Sat, 13 Oct 2007 14:48:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dutta",
"Sukanta",
""
],
[
"Hagiwara",
"Kaoru",
""
],
[
"Yan",
"Qi-Shu",
""
],
[
"Yoshida",
"Kentaroh",
""
]
] |
0705.2278 | Wei Dai | Wei Dai, Brian Rider and Youjian Liu | Unequal dimensional small balls and quantization on Grassmann Manifolds | Wei_Dai_Conference_Paper : Proc. IEEE International Symposium on
Information Theory (ISIT), 2007 | null | 10.1109/ISIT.2007.4557483 | null | cs.IT math.IT | null | The Grassmann manifold G_{n,p}(L) is the set of all p-dimensional planes
(through the origin) in the n-dimensional Euclidean space L^{n}, where L is
either R or C. This paper considers an unequal dimensional quantization in
which a source in G_{n,p}(L) is quantized through a code in G_{n,q}(L), where p
and q are not necessarily the same. It is different from most works in
literature where p\equiv q. The analysis for unequal dimensional quantization
is based on the volume of a metric ball in G_{n,p}(L) whose center is in
G_{n,q}(L). Our chief result is a closed-form formula for the volume of a
metric ball when the radius is sufficiently small. This volume formula holds
for Grassmann manifolds with arbitrary n, p, q and L, while previous results
pertained only to some special cases. Based on this volume formula, several
bounds are derived for the rate distortion tradeoff assuming the quantization
rate is sufficiently high. The lower and upper bounds on the distortion rate
function are asymptotically identical, and so precisely quantify the asymptotic
rate distortion tradeoff. We also show that random codes are asymptotically
optimal in the sense that they achieve the minimum achievable distortion with
probability one as n and the code rate approach infinity linearly. Finally, we
discuss some applications of the derived results to communication theory. A
geometric interpretation in the Grassmann manifold is developed for capacity
calculation of additive white Gaussian noise channel. Further, the derived
distortion rate function is beneficial to characterizing the effect of
beamforming matrix selection in multi-antenna communications.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 04:31:48 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Dai",
"Wei",
""
],
[
"Rider",
"Brian",
""
],
[
"Liu",
"Youjian",
""
]
] |
0705.2279 | Seunghun Lee | S.-H. Lee, H. Kikuchi, Y. Qiu, B. Lake, Q. Huang, K. Habicht and K.
Kiefer | Quantum spin liquid states in the two dimensional kagome
antiferromagnets, ZnxCu4-x(OD)6Cl2 | null | null | 10.1038/nmat1986 | null | cond-mat.str-el cond-mat.mtrl-sci | null | A three-dimensional system of interacting spins typically develops static
long-range order when it is cooled. If the spins are quantum (S = 1/2),
however, novel quantum paramagnetic states may appear. The most highly sought
state among them is the resonating valence bond (RVB) state in which every pair
of neighboring quantum spins form entangled spin singlets (valence bonds) and
the singlets are quantum mechanically resonating amongst all the possible
highly degenerate pairing states. Here we provide experimental evidence for
such quantum paramagnetic states existing in frustrated antiferromagnets,
ZnxCu4-x(OD)6Cl2, where the S = 1/2 magnetic Cu2+ moments form layers of a
two-dimensional kagome lattice. We find that in Cu4(OD)6Cl2, where distorted
kagome planes are weakly coupled to each other, a dispersionless excitation
mode appears in the magnetic excitation spectrum below ~ 20 K, whose
characteristics resemble those of quantum spin singlets in a solid state, known
as a valence bond solid (VBS), that breaks translational symmetry. Doping
nonmagnetic Zn2+ ions reduces the distortion of the kagome lattice, and weakens
the interplane coupling but also dilutes the magnetic occupancy of the kagome
lattice. The VBS state is suppressed and for ZnCu3(OD)6Cl2 where the kagome
planes are undistorted and 90% occupied by the Cu2+ ions, the low energy spin
fluctuations in the spin liquid phase become featureless.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 04:48:47 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Lee",
"S. -H.",
""
],
[
"Kikuchi",
"H.",
""
],
[
"Qiu",
"Y.",
""
],
[
"Lake",
"B.",
""
],
[
"Huang",
"Q.",
""
],
[
"Habicht",
"K.",
""
],
[
"Kiefer",
"K.",
""
]
] |
0705.2280 | Christopher Field | Chris M. Field | Extension of the Adler-Bobenko-Suris classification of integrable
lattice equations | 14 pages, 2 figures | null | 10.1088/1751-8113/40/27/F03 | null | nlin.SI | null | The classification of lattice equations that are integrable in the sense of
higher-dimensional consistency is extended by allowing directed edges. We find
two cases that are not transformable via the 'admissible transformations' to
the lattice equations in the existing classification.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 06:09:14 GMT"
},
{
"version": "v2",
"created": "Wed, 23 May 2007 11:12:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Field",
"Chris M.",
""
]
] |
0705.2281 | J\"urgen Sawinski | J. Sawinski, D. Debarre, W. Denk | Tunable Ti:Al2O3 oscillator optimized for high-repetition-rate and short
pulses | 14 pages, 5 figures | null | null | null | physics.optics physics.bio-ph | null | A laser was designed and constructed with the goal of producing ultra-short
pulses at a high repetition rate as needed for certain applications of
multi-photon microscopy. With pure prism-based dispersion compensation
repetition rates of up to 270MHz were achieved. The laser operates with hard-
and soft-aperturing at the third (diverging output) and the first (parallel
output) stability limits, respectively. At the third stability limit we found a
pulse width of 27fs (FWHM) at 800nm central wavelength. At the first stability
limit pulse widths of 23-40fs with tunability from 780nm to 920nm were reached.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 06:35:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sawinski",
"J.",
""
],
[
"Debarre",
"D.",
""
],
[
"Denk",
"W.",
""
]
] |
0705.2282 | Mark Breese Professor | M B H Breese, V M Biryukov | Enhanced Beam Deflection in Bent Crystals using Multiple Volume
Reflection | Submiitted to Nuclear Instruments and Methods B | Nucl.Instrum.Meth.B263:395-400,2007 | 10.1016/j.nimb.2007.07.013 | null | physics.acc-ph physics.space-ph | null | This paper presents simulations of the trajectories of high-energy ions
through several bent crystal layers. At certain layer alignments volume
reflection occurs from each layer and the resultant multiple volume reflection
angle is correspondingly increased, along with the range of entrance angles
over which ions undergo volume reflection. Another feature is that the range of
entrance angles for which bent crystal channeling occurs is also increased in
passing through several bent layers. The use of several bent crystal layers to
produce multiple volume reflection provides an alternative approach to the
design of a space shield or radiation protection at accelerators based on bent
crystals.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 06:48:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Breese",
"M B H",
""
],
[
"Biryukov",
"V M",
""
]
] |
0705.2283 | Li Xue | Shuang-Liang Li, Li Xue, and Ju-Fu Lu | Studies of Thermally Unstable Accretion Disks around Black Holes with
Adaptive Pseudo-Spectral Domain Decomposition Method I. Limit-Cycle Behavior
in the Case of Moderate Viscosity | 29 pages, 8 figures, accepted by ApJ | Astrophys.J.666:368-377,2007 | 10.1086/519834 | null | astro-ph | null | We present a numerical method for spatially 1.5-dimensional and
time-dependent studies of accretion disks around black holes, that is
originated from a combination of the standard pseudo-spectral method and the
adaptive domain decomposition method existing in the literature, but with a
number of improvements in both the numerical and physical senses. In
particular, we introduce a new treatment for the connection at the interfaces
of decomposed subdomains, construct an adaptive function for the mapping
between the Chebyshev-Gauss-Lobatto collocation points and the physical
collocation points in each subdomain, and modify the over-simplified
1-dimensional basic equations of accretion flows to account for the effects of
viscous stresses in both the azimuthal and radial directions. Our method is
verified by reproducing the best results obtained previously by Szuszkiewicz &
Miller on the limit-cycle behavior of thermally unstable accretion disks with
moderate viscosity. A new finding is that, according to our computations, the
Bernoulli function of the matter in such disks is always and everywhere
negative, so that outflows are unlikely to originate from these disks. We are
encouraged to study the more difficult case of thermally unstable accretion
disks with strong viscosity, and wish to report our results in a subsequent
paper.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 06:49:31 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Li",
"Shuang-Liang",
""
],
[
"Xue",
"Li",
""
],
[
"Lu",
"Ju-Fu",
""
]
] |
0705.2284 | Dongseok Kim | Dongseok Kim, Young Soo Kwon and Jaeun Lee | The weighted complexity and the determinant functions of graphs | null | Linear algebra and its applications, 433 (2010), 348-355 | null | null | math.CO | null | The complexity of a graph can be obtained as a derivative of a variation of
the zeta function or a partial derivative of its generalized characteristic
polynomial evaluated at a point [\textit{J. Combin. Theory Ser. B}, 74 (1998),
pp. 408--410]. A similar result for the weighted complexity of weighted graphs
was found using a determinant function [\textit{J. Combin. Theory Ser. B}, 89
(2003), pp. 17--26]. In this paper, we consider the determinant function of two
variables and discover a condition that the weighted complexity of a weighted
graph is a partial derivative of the determinant function evaluated at a point.
Consequently, we simply obtain the previous results and disclose a new formula
for the Bartholdi zeta function. We also consider a new weighted complexity,
for which the weights of spanning trees are taken as the sum of weights of
edges in the tree, and find a similar formula for this new weighted complexity.
As an application, we compute the weighted complexities of the product of the
complete graphs.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 06:51:20 GMT"
},
{
"version": "v2",
"created": "Mon, 28 May 2007 06:13:05 GMT"
}
] | 2010-11-01T00:00:00 | [
[
"Kim",
"Dongseok",
""
],
[
"Kwon",
"Young Soo",
""
],
[
"Lee",
"Jaeun",
""
]
] |
0705.2285 | Dongho Chae | Dongho Chae | Remarks on regularity conditions of the Navier-Stokes equations | 13 pages | null | null | null | math.AP | null | Let $v$ and $\o$ be the velocity and the vorticity of the a suitable weak
solution of the 3D Navier-Stokes equations in a space-time domain containing
$z_0 =(x_0, t_0)$, and $Q_{z_0, r} =B_{x_0, r}\times (t_0-r^2, t_0)$ be a
parabolic cylinder in the domain. We show that if $v\times \frac{\o}{|\o|}\in
L^{\gamma, \alpha}_{x,t} (Q_{z_0, r})$ or ${\o}\times \frac{v}{|v|}\in
L^{\gamma, \alpha}_{x,t} (Q_{z_0, r})$, where $L^{\gamma, \alpha}_{x,t}$
denotes the Serrin type of class, then $z_0$ is a regular point for $v$. This
refines previous local regularity criteria for the suitable weak solutions.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 07:08:32 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 05:31:37 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chae",
"Dongho",
""
]
] |
0705.2286 | Bernhard Mehlig | A. Eriksson, P. Fernstrom, B. Mehlig, and S. Sagitov | An accurate model for genetic hitch-hiking | 12 pages, 10 figures | Genetics 178, 439 (2008) | null | null | q-bio.PE | null | We suggest a simple deterministic approximation for the growth of the
favoured-allele frequency during a selective sweep. Using this approximation we
introduce an accurate model for genetic hitch-hiking. Only when Ns < 10 (N is
the population size and s denotes the selection coefficient), are discrepancies
between our approximation and direct numerical simulations of a Moran model
noticeable. Our model describes the gene genealogies of a contiguous segment of
neutral loci close to the selected one, and it does not assume that the
selective sweep happens instantaneously. This enables us to compute SNP
distributions on the neutral segment without bias.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 12:37:39 GMT"
}
] | 2008-12-19T00:00:00 | [
[
"Eriksson",
"A.",
""
],
[
"Fernstrom",
"P.",
""
],
[
"Mehlig",
"B.",
""
],
[
"Sagitov",
"S.",
""
]
] |
0705.2287 | Seick Kim | Hongjie Dong, Seick Kim, Mikhail Safonov | On Uniqueness of Boundary Blow-up Solutions of a Class of Nonlinear
Elliptic Equations | To appear in Comm. Partial Differential Equations; 10 pages | Comm. Partial Differential Equations 33 (2008), no. 2, pp. 177-188 | 10.1080/03605300601188748 | null | math.AP | null | We study boundary blow-up solutions of semilinear elliptic equations
$Lu=u_+^p$ with $p>1$, or $Lu=e^{au}$ with $a>0$, where $L$ is a second order
elliptic operator with measurable coefficients. Several uniqueness theorems and
an existence theorem are obtained.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 07:56:47 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Dong",
"Hongjie",
""
],
[
"Kim",
"Seick",
""
],
[
"Safonov",
"Mikhail",
""
]
] |
0705.2288 | Kai-Yu Yang | Kai-Yu Yang, T. M. Rice, and Fu-Chun Zhang | Effect of superlattice modulation of electronic parameters on
superconducting density of states in cuprate superconductors | 4 pages, 5 figures, Phys. Rev. B 76, 100501 | null | null | null | cond-mat.supr-con | null | Recent scanning tunneling microscopy on BSCCO 2212 has revealed a substantial
spatial supermodulation of the energy gap in the superconducting state. We
propose that this gap modulation is due to the superlattice modulations of the
atoms in the structure, and hence the parameters in a microscopic model of the
CuO2 plane. The gap modulation is estimated using renormalized mean field
theory for a t-t'-J model on a superlattice. The results compare well with
experiment.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 08:44:28 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 03:23:45 GMT"
}
] | 2007-09-11T00:00:00 | [
[
"Yang",
"Kai-Yu",
""
],
[
"Rice",
"T. M.",
""
],
[
"Zhang",
"Fu-Chun",
""
]
] |
0705.2289 | Shahram Jalalzadeh | P. Moyassari and S. Jalalzadeh | Semiclassical corrections to the Einstein equation and Induced Matter
Theory | 9 pages, to appear in GRG | Gen.Rel.Grav.39:1467-1476,2007 | 10.1007/s10714-007-0466-7 | null | gr-qc | null | The induced Einstein equation on a perturbed brane in the Induced Matter
Theory is re-analyzed. We indicate that in a conformally flat background, the
local quantum corrections to the Einstein equation can be obtained via the IMT.
Using the FRW metric as the 4D gravitational model, we show that the classical
fluctuations of the brane may be related to the quantum corrections to the
classical Einstein equation. In other words, the induced Einstein equation on
the perturbed brane correspond with the semiclassical Einstein equation.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 07:38:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Moyassari",
"P.",
""
],
[
"Jalalzadeh",
"S.",
""
]
] |
0705.2290 | Patricia Ball | Patricia Ball | |V_{ub}| from the Spectrum of B->pi e nu | Proceedings of FPCP07, Bled, Slovenia | ECONFC070512:016,2007 | null | IPPP/07/19 | hep-ph | null | I discuss the results for $|V_{ub}|f_+(0)$ and $|V_{ub}|$ obtained from the
spectrum of $B\to\pi e \nu$ and the form factor $f_+(q^2)$ from QCD sum rules
on the light-cone and unquenched lattice calculations; the shape of $f_+(q^2)$
is fixed from experimental data.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 07:49:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ball",
"Patricia",
""
]
] |
0705.2291 | Carlo Vanderzande | Enzo Orlandini, Attilio L. Stella, Carlo Vanderzande, Francesco Zonta | Self-reptation and slow topological time scale of knotted polymers | 4 pages, 4 figures | null | null | null | cond-mat.stat-mech cond-mat.soft | null | We investigate the Rouse dynamics of a flexible ring polymer with a prime
knot. Within a Monte Carlo approach, we locate the knot, follow its diffusion,
and observe the fluctuations of its length. We characterise a topological time
scale, and show that it is related to a self-reptation of the knotted region.
The associated dynamical exponent, $z_T=2.32\pm.1$, can be related to that of
the equilibrium knot length distribution and determines the behaviour of
several dynamical quantities.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 07:51:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Orlandini",
"Enzo",
""
],
[
"Stella",
"Attilio L.",
""
],
[
"Vanderzande",
"Carlo",
""
],
[
"Zonta",
"Francesco",
""
]
] |
0705.2292 | Sven Burger | S. Burger, L. Zschiedrich, F. Schmidt, R. K\"ohle, T. Henkel, B.
K\"uchler, C. N\"olscher | 3D Simulations of Electromagnetic Fields in Nanostructures using the
Time-Harmonic Finite-Element Method | 11 pages, 12 figures, SPIE conference Modeling Aspects in Optical
Metrology (2007) | Proc. SPIE 6617 (2007) 66170V (Modeling Aspects in Optical
Metrology, H. Bosse, B. Bodermann, R. M. Silver, Eds.) | 10.1117/12.726236 | null | physics.optics physics.comp-ph | null | Rigorous computer simulations of propagating electromagnetic fields have
become an important tool for optical metrology and optics design of
nanostructured components. As has been shown in previous benchmarks some of the
presently used methods suffer from low convergence rates and/or low accuracy of
the results and exhibit very long computation times which makes application to
extended 2D layout patterns impractical. We address 3D simulation tasks by
using a finite-element solver which has been shown to be superior to competing
methods by several orders of magnitude in accuracy and computational time for
typical microlithography simulations. We report on the current status of the
solver, incorporating higher order edge elements, adaptive refinement methods,
and fast solution algorithms. Further, we investigate the performance of the
solver in the 3D simulation project of light diffraction off an alternating
phase-shift contact-hole mask.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 08:00:27 GMT"
}
] | 2007-09-25T00:00:00 | [
[
"Burger",
"S.",
""
],
[
"Zschiedrich",
"L.",
""
],
[
"Schmidt",
"F.",
""
],
[
"Köhle",
"R.",
""
],
[
"Henkel",
"T.",
""
],
[
"Küchler",
"B.",
""
],
[
"Nölscher",
"C.",
""
]
] |
0705.2293 | Manabu Ozaki | Manabu Ozaki | Construction of maximal unramified p-extensions with prescribed Galois
groups | In this new version, a considerable improvement has been done, that
is, Theorems 1 and 2 have been established for all the prime number p
(without restrictive assumption C(p) on the prime number p) | null | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper, we shall show that for any prime number p, every finite
p-group occurs as the Galois Group of the maximal unramified p-extension over a
certain number field of finite degree.
We shall also show that for any given pro-p-group G with countably many
generators, there exists a number field (not necessary of finite degree) whose
maximal unramified p-extension has Galois group isomorphic to G. This means
that the set of the isomorphism classes of the Galois groups of the maximal
unramified p-extensions over the number fields (including of infinite degree)
is precisely equal to that of all the pro-p-groups with countably many
generators.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 08:03:46 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Jul 2009 07:27:49 GMT"
}
] | 2009-07-17T00:00:00 | [
[
"Ozaki",
"Manabu",
""
]
] |
0705.2294 | Vladimir Shelkovich M | V.M. Shelkovich, M. Skopina | $p$-Adic Haar multiresolution analysis and pseudo-differential operators | null | null | null | null | math-ph math.GM math.MP | null | The notion of {\em $p$-adic multiresolution analysis (MRA)} is introduced. We
discuss a ``natural'' refinement equation whose solution (a refinable function)
is the characteristic function of the unit disc. This equation reflects the
fact that the characteristic function of the unit disc is a sum of $p$
characteristic functions of mutually disjoint discs of radius $p^{-1}$. This
refinement equation generates a MRA. The case $p=2$ is studied in detail. Our
MRA is a 2-adic analog of the real Haar MRA. But in contrast to the real
setting, the refinable function generating our Haar MRA is 1-periodic, which
never holds for real refinable functions. This fact implies that there exist
infinity many different 2-adic orthonormal wavelet bases in ${\cL}^2(\bQ_2)$
generated by the same Haar MRA. All of these bases are described. We also
constructed multidimensional 2-adic Haar orthonormal bases for
${\cL}^2(\bQ_2^n)$ by means of the tensor product of one-dimensional MRAs. A
criterion for a multidimensional $p$-adic wavelet to be an eigenfunction for a
pseudo-differential operator is derived. We proved also that these wavelets are
eigenfunctions of the Taibleson multidimensional fractional operator. These
facts create the necessary prerequisites for intensive using our bases in
applications.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 08:08:26 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Shelkovich",
"V. M.",
""
],
[
"Skopina",
"M.",
""
]
] |
0705.2295 | Maria Chamarro | E. Aubry, C. Testelin, F. Bernardot, and M. Chamarro, and A. Lemaitre | Anisotropic spin splitting of the electron ground state in InAs quantum
dots | 13 pages, 3 figures | null | 10.1063/1.2748847 | null | cond-mat.mtrl-sci | null | Photoinduced circular dichroism experiments in an oblique magnetic field
allow measurements of Larmor precession frequencies, and so give a precise
determination of the electron Lande g factor and its anisotropy in
self-assembled InAs/GaAs quantum dots emitting at 1.32 eV. In good agreement
with recent theoretical results, we measure g perp= 0.397 +_ 0.003 and g par =
0.18 +- 0.02.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 08:34:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aubry",
"E.",
""
],
[
"Testelin",
"C.",
""
],
[
"Bernardot",
"F.",
""
],
[
"Chamarro",
"M.",
""
],
[
"Lemaitre",
"A.",
""
]
] |
0705.2296 | Juraj Darmo | Josef Kr\"oll, Juraj Darmo, Sukhdeep S. Dhillon, Carlo Sirtori, Karl
Unterrainer, Xavier Marcadet, Michel Calligaro | Phase resolved measurements of stimulated emission | PDF file format, 16 pages, 5 figures | null | 10.1038/nature06208 | null | cond-mat.mtrl-sci | null | The development of the semiconductor quantum cascade laser (QCL) [1] has
enabled bright coherent sources operating at frequencies between the optical
(>100 THz) and electronic (<0.5 THz) ranges opening this frequency region for
fundamental science investigations [2-5] as well as for applications [6].
However, detailed information about the internal processes in QCLs and their
ultrafast dynamics are needed for their further development towards high output
power, longer wavelengths and stable pulsed operation. We introduce a novel
approach to study the gain and dynamics of a terahertz (THz) QCL [7] using
phase resolved measurements of the stimulated emission. This is enabled by
direct recording of the emitted electric field with <100 fs time resolution.
For the case of the THz QCL we demonstrate the validity of the quantum
mechanical description of the laser. We show for the first time the real
bandwidth of the terahertz gain medium, the current dependence of this gain,
and the losses associated with the wave propagation in the laser waveguide.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 08:20:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kröll",
"Josef",
""
],
[
"Darmo",
"Juraj",
""
],
[
"Dhillon",
"Sukhdeep S.",
""
],
[
"Sirtori",
"Carlo",
""
],
[
"Unterrainer",
"Karl",
""
],
[
"Marcadet",
"Xavier",
""
],
[
"Calligaro",
"Michel",
""
]
] |
0705.2297 | Ramiro Godoy-Diana | Ramiro Godoy-Diana and Steven P.R. Czitrom | On the tuning of a wave-energy driven oscillating-water-column seawater
pump to polychromatic waves | 21 pages, 14 figures | Ocean Engineering, Vol. 34, pp. 2374-2384 (2007) | 10.1016/j.oceaneng.2007.05.001 | null | physics.flu-dyn physics.ao-ph | null | Performance of wave-energy devices of the oscillating water column (OWC) type
is greatly enhanced when a resonant condition with the forcing waves is
maintained. The natural frequency of such systems can in general be tuned to
resonate with a given wave forcing frequency. In this paper we address the
tuning of an OWC sea-water pump to polychromatic waves. We report results of
wave tank experiments, which were conducted with a scale model of the pump.
Also, a numerical solution for the pump equations, which were proven in
previous work to successfully describe its behavior when driven by
monochromatic waves, is tested with various polychromatic wave spectra. Results
of the numerical model forced by the wave trains measured in the wave tank
experiments are used to develop a tuning criterion for the sea-water pump.
| [
{
"version": "v1",
"created": "Wed, 16 May 2007 08:27:02 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Godoy-Diana",
"Ramiro",
""
],
[
"Czitrom",
"Steven P. R.",
""
]
] |
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