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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.4198 | Poilblanc | Didier Poilblanc | Exotic Mott phases of the extended t--J model on the checkerboard
lattice at commensurate densities | 7 pages, 7 figures Follow-up of cond-mat/0702367 | Phys. Rev. B 76, 115104 (2007) | 10.1103/PhysRevB.76.115104 | null | cond-mat.str-el cond-mat.supr-con | null | Coulomb repulsion between electrons moving on a frustrated lattice can give
rise, at simple commensurate electronic densities, to exotic insulating phases
of matter. Such a phenomenon is illustrated using an extended t--J model on a
planar pyrochlore lattice for which the work on the quarter-filled case
[cond-mat/0702367] is complemented and extended to 1/8- and 3/8-fillings. The
location of the metal-insulator transition as a function of the Coulomb
repulsion is shown to depend strongly on the sign of the hopping. Quite
generally, the metal-insulator transition is characterized by lattice symmetry
breaking but the nature of the insulating Mott state is more complex than a
simple Charge Density Wave. Indeed, in the limit of large Coulomb repulsion,
the physics can be described in the framework of (extended) quantum
fully-packed loop or dimer models carrying extra spin degrees of freedom.
Various diagonal and off-diagonal plaquette correlation functions are computed
and the low-energy spectra are analyzed in details in order to characterize the
nature of the insulating phases. We provide evidence that, as for an electronic
density of n=1/2 (quarter-filling), the system at $n=1/4$ or $n=3/4$ exhibits
also plaquette order by forming a (lattice rotationally-invariant)
Resonating-Singlet-Pair Crystal, although with a quadrupling of the lattice
unit cell (instead of a doubling for $n=1/2$) and a 4-fold degenerate ground
state. Interestingly, qualitative differences with the bosonic analog (e.g.
known to exhibit columnar order at n=1/4) emphasize the important role of the
spin degrees of freedom in e.g. stabilizing plaquette phases w.r.t. rotational
symmetry-breaking phases.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:43:49 GMT"
}
] | 2008-04-24T00:00:00 | [
[
"Poilblanc",
"Didier",
""
]
] |
0705.4199 | Alberto Leccardi | A. Leccardi and S. Molendi | In search of an unbiased temperature estimator for statistically poor
X-ray spectra | 9 pages, 9 figures, accepted for publication in A&A | Phys.Rev.D80:015018,2009 | 10.1103/PhysRevD.80.015018 | null | astro-ph | null | Although commonly employed by X-ray astronomers, maximum likelihood
estimators are known to be biased. In this paper we investigate the bias
associated to the measure of the temperature from an X-ray thermal spectrum. We
show that, in the case of low surface brightness regions, commonly adopted
estimators, such as those based on chi squared and Cash statistics, return
strongly biased results. We stress that this can have strong implications when
measuring the temperature of cluster outer regions with current experiments. We
consider various approaches to overcome this problem, the most effective is a
technique which allows us to correct the bias a posteriori. Extensive
montecarlo simulations show that our correction returns excellent results under
different conditions.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:44:11 GMT"
}
] | 2009-08-13T00:00:00 | [
[
"Leccardi",
"A.",
""
],
[
"Molendi",
"S.",
""
]
] |
0705.4200 | Djordje Baljozovic | Slobodanka Jankovic, Milan Merkle | A mean value theorem for systems of integrals | 7 pages | J. Math. Anal. Appl, 342(2008), 334-339. | 10.1016/j.jmaa.2007.12.012 | null | math.NA | null | More than a century ago, G. Kowalewski stated that for each n continuous
functions on a compact interval [a,b], there exists an n-point quadrature rule
(with respect to Lebesgue measure on [a,b]), which is exact for given
functions. Here we generalize this result to continuous functions with an
arbitrary positive and finite measure on an arbitrary interval. The proof
relies on a version of Caratheodory's convex hull theorem for a continuous
curve, that we also prove in the paper. As applications, we give a
representation of the covariance for two continuous functions of a random
variable, and a most general version of Gruess' inequality.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:48:14 GMT"
}
] | 2008-10-10T00:00:00 | [
[
"Jankovic",
"Slobodanka",
""
],
[
"Merkle",
"Milan",
""
]
] |
0705.4201 | Paolo Bellingeri | Valerij G. Bardakov (AOSSI), Paolo Bellingeri | On residual properties of pure braid groups of closed surfaces | null | null | null | null | math.GR | null | We prove that pure braid groups of closed surface are almost-direct products
of residually torsion free nilpotent groups and hence residually torsion free
nilpotent. As a Corollary, we prove also that braid groups on 2 strands of
closed surfaces are residually nilpotent.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:00:48 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Bardakov",
"Valerij G.",
"",
"AOSSI"
],
[
"Bellingeri",
"Paolo",
""
]
] |
0705.4202 | Dr. Anirudh Pradhan | Anirudh Pradhan, G. S. Khadekar, M. K. Mishra and S. Kumbhare | Higher Dimensional Strange Quark Matter Coupled to the String Cloud with
Electromagnetic Field Admitting One Parameter Group of Conformal Motion | This paper has been withdrawn by arXiv administrators | Chin.Phys.Lett.24:3013-3016,2007 | 10.1088/0256-307X/24/10/083 | null | gr-qc | null | This paper has been withdrawn by arXiv administrators because of an
inappropriate amount of overlap with hep-th/0505013.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:01:16 GMT"
},
{
"version": "v2",
"created": "Sat, 18 Aug 2007 09:39:55 GMT"
},
{
"version": "v3",
"created": "Thu, 13 Dec 2007 18:53:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Khadekar",
"G. S.",
""
],
[
"Mishra",
"M. K.",
""
],
[
"Kumbhare",
"S.",
""
]
] |
0705.4203 | Serge Troubetzkoy | Ai-Hua Fan (LAMFA), Joerg Schmeling, Serge Troubetzkoy (CPT, FRUMAM,
IML) | Dynamical Diophantine Approximation | null | Proc. Lond. Math. Soc. 107, 5 (2013) 1173-1219 | null | null | math.DS math.NT math.PR | null | Let $\mu$ be a Gibbs measure of the doubling map $T$ of the circle. For a
$\mu$-generic point $x$ and a given sequence $\{r_n\} \subset \R^+$, consider
the intervals $(T^nx - r_n \pmod 1, T^nx + r_n \pmod 1)$. In analogy to the
classical Dvoretzky covering of the circle we study the covering properties of
this sequence of intervals. This study is closely related to the local entropy
function of the Gibbs measure and to hitting times for moving targets. A mass
transference principle is obtained for Gibbs measures which are multifractal.
Such a principle was shown by Beresnevich and Velani \cite{BV} only for
monofractal measures. In the symbolic language we completely describe the
combinatorial structure of a typical relatively short sequence, in particular
we can describe the occurrence of ''atypical'' relatively long words. Our
results have a direct and deep number-theoretical interpretation via
inhomogeneous diadic diophantine approximation by numbers belonging to a given
(diadic) diophantine class.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:17:27 GMT"
}
] | 2014-03-25T00:00:00 | [
[
"Fan",
"Ai-Hua",
"",
"LAMFA"
],
[
"Schmeling",
"Joerg",
"",
"CPT, FRUMAM,\n IML"
],
[
"Troubetzkoy",
"Serge",
"",
"CPT, FRUMAM,\n IML"
]
] |
0705.4204 | Franz J. Kaiser | Franz J. Kaiser and Sigmund Kohler | Shot noise in non-adiabatically driven nanoscale conductors | 17 pages, 2 figures | Ann. Phys. 16, 702 (2007) | 10.1002/andp.200710257 | null | cond-mat.mes-hall | null | We investigate the noise properties of pump currents through molecular wires
and coupled quantum dots. As a model we employ a two level system that is
connected to electron reservoirs and is non-adiabatically driven. Concerning
the electron-electron interaction, we focus on two limits: non-interacting
electrons and strong Coulomb repulsion. While the former case is treated within
a Floquet scattering formalism, we derive for the latter case a master equation
formalism for the computation of the current and the zero-frequency noise. For
a pump operated close to internal resonances, the differences between the
non-interacting and the strongly interacting limit turn out to be surprisingly
small.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:34:24 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Kaiser",
"Franz J.",
""
],
[
"Kohler",
"Sigmund",
""
]
] |
0705.4205 | Daniel Blaschke | Daniel N. Blaschke, Harald Grosse, Manfred Schweda | Non-Commutative U(1) Gauge Theory on R**4 with Oscillator Term and BRST
Symmetry | 7 pages; v2 revised, v3 corrected eq. (14) and related text,
references updated | Europhys.Lett.79:61002,2007 | 10.1209/0295-5075/79/61002 | null | hep-th | null | Inspired by the renormalizability of the non-commutative Phi^4 model with
added oscillator term, we formulate a non-commutative gauge theory, where the
oscillator enters as a gauge fixing term in a BRST invariant manner. All
propagators turn out to be essentially given by the Mehler kernel and the
bilinear part of the action is invariant under the Langmann-Szabo duality. The
model is a promising candidate for a renormalizable non-commutative U(1) gauge
theory.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:34:23 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Jun 2007 10:20:56 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Jan 2008 13:13:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Blaschke",
"Daniel N.",
""
],
[
"Grosse",
"Harald",
""
],
[
"Schweda",
"Manfred",
""
]
] |
0705.4206 | Victor Tikhomirov | Victor Tikhomirov | Multiple Volume Reflection from Different Planes Inside One Bent Crystal | 17 pages, 6 figures | Phys.Lett.B655:217-222,2007 | 10.1016/j.physletb.2007.09.049 | null | physics.acc-ph physics.ins-det | null | It is shown that multiple volume reflections from different planes of one
bent crystal becomes possible when particles move at a small angle with respect
to a crystal axis. Such a Multiple Volume Reflection makes it possible to
increase the particle deflection angle inside one crystal by more than four
times and can be used to increase the efficiency of beam extraction and
collimation at the LHC and many other accelerators.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:38:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tikhomirov",
"Victor",
""
]
] |
0705.4207 | Dan Ralph | J. C. Sankey, Y.-T. Cui, R. A. Buhrman, D. C. Ralph, J. Z. Sun, J. C.
Slonczewski | Measurement of the Spin-Transfer-Torque Vector in Magnetic Tunnel
Junctions | 33 pages, 9 figures | null | 10.1038/nphys783 | null | cond-mat.other | null | Spin-polarized currents can transfer spin angular momentum to a ferromagnet,
generating a torque that can efficiently reorient its magnetization. Achieving
quantitative measurements of the spin-transfer-torque vector in magnetic tunnel
junctions (MTJs) is important for understanding fundamental mechanisms
affecting spin-dependent tunneling, and for developing magnetic memories and
nanoscale microwave oscillators. Here we present direct measurements of both
the magnitude and direction of the spin torque in Co60Fe20B20/MgO/Co60Fe20B20
MTJs. At low bias V, the differential torque vector d{tau}/dV lies in the plane
defined by the electrode magnetizations, and its magnitude is in excellent
agreement with a prediction for highly-spin-polarized tunneling. With
increasing bias, the in-plane component d{tau}_{parallel}/dV remains large, in
striking contrast to the decreasing magnetoresistance ratio. The differential
torque vector also rotates out of the plane under bias; we measure a
perpendicular component tau_{perp}(V) with bias dependence proportional to V^2
for low V, that becomes as large as 30% of the in-plane torque.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:48:49 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Sankey",
"J. C.",
""
],
[
"Cui",
"Y. -T.",
""
],
[
"Buhrman",
"R. A.",
""
],
[
"Ralph",
"D. C.",
""
],
[
"Sun",
"J. Z.",
""
],
[
"Slonczewski",
"J. C.",
""
]
] |
0705.4208 | Abdeslam Mimouni | Abdeslam Mimouni | Ratliff-Rush Closure of Ideals in Integral Domains | 10 pages | null | null | null | math.AC | null | This paper studies the Ratliff-Rush closure of ideals in integral domains. By
definition, the Ratliff-Rush closure of an ideal $I$ of a domain $R$ is the
ideal given by $\tilde{I}:=\bigcup(I^{n+1}:_{R}I^{n})$ and an ideal $I$ is said
to be a Ratliff-Rush ideal if $\tilde{I}=I$. We completely characterize
integrally closed domains in which every ideal is a Ratliff-Rush ideal and we
give a complete description of the Ratliff-Rush closure of an ideal in a
valuation domain.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:41:33 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Nov 2007 14:54:44 GMT"
},
{
"version": "v3",
"created": "Mon, 11 Feb 2008 14:16:11 GMT"
}
] | 2008-02-11T00:00:00 | [
[
"Mimouni",
"Abdeslam",
""
]
] |
0705.4209 | Tomasz Placek Dr. | Leszek Wro\'nski and Tomasz Placek | On Infinite EPR-like Correlations | 42 pages, no figures | null | null | null | quant-ph | null | The paper investigates, in the framework of branching space-times, whether an
infinite EPR-like correlation which does not involve finite EPR-like
correlations is possible.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:08:22 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Wroński",
"Leszek",
""
],
[
"Placek",
"Tomasz",
""
]
] |
0705.4210 | Mauro Sbragaglia Dr | Mauro Sbragaglia, Alisia M. Peters, Christophe Pirat, Bram M. Borkent,
Rob G. H. Lammertink, Matthias Wessling, and Detlef Lohse | Spontaneous Breakdown of Superhydrophobicity | Accepted for publication in Physical Review Letters | Physical Review Letters 99, 156001 (2007) | 10.1103/PhysRevLett.99.156001 | null | physics.flu-dyn cond-mat.soft cond-mat.stat-mech nlin.PS | null | In some cases water droplets can completely wet micro-structured
superhydrophobic surfaces. The {\it dynamics} of this rapid process is analyzed
by ultra-high-speed imaging. Depending on the scales of the micro-structure,
the wetting fronts propagate smoothly and circularly or -- more interestingly
-- in a {\it stepwise} manner, leading to a growing {\it square-shaped} wetted
area: entering a new row perpendicular to the direction of front propagation
takes milliseconds, whereas once this has happened, the row itself fills in
microseconds ({\it ``zipping''})
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 12:53:06 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 08:00:13 GMT"
},
{
"version": "v3",
"created": "Fri, 31 Aug 2007 10:22:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sbragaglia",
"Mauro",
""
],
[
"Peters",
"Alisia M.",
""
],
[
"Pirat",
"Christophe",
""
],
[
"Borkent",
"Bram M.",
""
],
[
"Lammertink",
"Rob G. H.",
""
],
[
"Wessling",
"Matthias",
""
],
[
"Lohse",
"Detlef",
""
]
] |
0705.4211 | Xiaofeng Guo | Xiaofeng Guo, Jun Li | Multiple scattering and energy loss in semi-inclusive deeply inelastic
eA scattering | 17 pages, 12 figures | null | null | null | hep-ph nucl-th | null | We calculate the multiple scattering effect on single hadron production in
semi-inclusive lepton-nucleus deeply inelastic scattering. We show that the
quantum interference of multiple scattering amplitudes leads to suppression in
hadron productions. At the leading power in medium length, the suppression can
be approximately expressed in terms of a shift in $z$ of the fragmentation
function $D(z)$, and could be therefore interpreted as the collisional energy
loss. We compare our calculation with existing experimental data. We also
discuss the effect of quark mass on the suppression. Our approach can be
extended to other observables in hadronic collisions.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:37:16 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Guo",
"Xiaofeng",
""
],
[
"Li",
"Jun",
""
]
] |
0705.4212 | Antoine Folacci | St\'ephane Ancey, Yves D\'ecanini, Antoine Folacci and Paul Gabrielli | Surface plasmon polaritons and surface phonon polaritons on metallic and
semiconducting spheres: Exact and semiclassical descriptions | v2: Typos corrected; v3: Paper extended to absorbing media,
references added and title changed | JOSA B, Vol. 26, pp.1176-1187 (2009) | 10.1364/JOSAB.26.001176 | null | cond-mat.mtrl-sci cond-mat.other physics.optics | null | We study the interaction of an electromagnetic field with a non-absorbing or
absorbing dispersive sphere in the framework of complex angular momentum
techniques. We assume that the dielectric function of the sphere presents a
Drude-like behavior or an ionic crystal behavior modelling metallic and
semiconducting materials. We more particularly emphasize and interpret the
modifications induced in the resonance spectrum by absorption. We prove that
"resonant surface polariton modes" are generated by a unique surface wave,
i.e., a surface (plasmon or phonon) polariton, propagating close to the sphere
surface. This surface polariton corresponds to a particular Regge pole of the
electric part (TM) of the S matrix of the sphere. From the associated Regge
trajectory we can construct semiclassically the spectrum of the complex
frequencies of the resonant surface polariton modes which can be considered as
Breit-Wigner-type resonances. Furthermore, by taking into account the Stokes
phenomenon, we derive an asymptotic expression for the position in the complex
angular momentum plane of the surface polariton Regge pole. We then describe
semiclassically the surface polariton and provide analytical expressions for
its dispersion relation and its damping in the non-absorbing and absorbing
cases. In these analytic expressions, we more particularly exhibit
well-isolated terms directly linked to absorption. Finally, we explain why the
photon-sphere system can be considered as an artificial atom (a ``plasmonic
atom" or "phononic atom") and we briefly discuss the implication of our results
in the context of the Casimir effect.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:01:58 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 11:33:08 GMT"
},
{
"version": "v3",
"created": "Mon, 10 Dec 2007 15:58:07 GMT"
}
] | 2009-10-20T00:00:00 | [
[
"Ancey",
"Stéphane",
""
],
[
"Décanini",
"Yves",
""
],
[
"Folacci",
"Antoine",
""
],
[
"Gabrielli",
"Paul",
""
]
] |
0705.4213 | Sergey Lysenko | Vincent Lafforgue (University Paris 6), Sergey Lysenko (University
Paris 6) | Geometric Weil representation: local field case | LaTeX2e, 37 pages | Compositio Mathematica , Volume 145 , Issue 1 , January 2009 , pp.
56 - 88 | 10.1112/S0010437X08003771 | null | math.RT math.AG | null | Let k be an algebraically closed field of characteristic >2, F=k((t)) and
Mp(F) denote the metaplectic extension of Sp_{2d}(F). In this paper we propose
a geometric analog of the Weil representation of Mp(F). This is a category of
certain perverse sheaves on some stack, on which Mp(F) acts by functors. This
construction will be used in math.RT/0701170 (and subsequent publications) for
a proof of the geometric Langlands functoriality for some dual reductive pairs.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:07:01 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 09:18:31 GMT"
}
] | 2023-08-25T00:00:00 | [
[
"Lafforgue",
"Vincent",
"",
"University Paris 6"
],
[
"Lysenko",
"Sergey",
"",
"University\n Paris 6"
]
] |
0705.4214 | James Lucietti | Hari K. Kunduri, James Lucietti, Harvey S. Reall | Near-horizon symmetries of extremal black holes | 21 pages, latex. v2: minor improvements v3: Corrected error in
argument excluding de Sitter and Poincare-symmetric cases. Results unaffected | Class.Quant.Grav.24:4169-4190,2007 | 10.1088/0264-9381/24/16/012 | DCPT-07/25 | hep-th gr-qc | null | Recent work has demonstrated an attractor mechanism for extremal rotating
black holes subject to the assumption of a near-horizon SO(2,1) symmetry. We
prove the existence of this symmetry for any extremal black hole with the same
number of rotational symmetries as known four and five dimensional solutions
(including black rings). The result is valid for a general two-derivative
theory of gravity coupled to abelian vectors and uncharged scalars, allowing
for a non-trivial scalar potential. We prove that it remains valid in the
presence of higher-derivative corrections. We show that SO(2,1)-symmetric
near-horizon solutions can be analytically continued to give SU(2)-symmetric
black hole solutions. For example, the near-horizon limit of an extremal 5D
Myers-Perry black hole is related by analytic continuation to a non-extremal
cohomogeneity-1 Myers-Perry solution.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:14:32 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 14:49:29 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Apr 2008 14:44:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kunduri",
"Hari K.",
""
],
[
"Lucietti",
"James",
""
],
[
"Reall",
"Harvey S.",
""
]
] |
0705.4215 | M\'elin R\'egis | S. Duhot and R. M\'elin | Non local Andreev reflection in a carbon nanotube superconducting
quantum interference device | 13 pages, 8 figures, revised version | Phys. Rev. B 77, 014525 (2008) | 10.1103/PhysRevB.77.014525 | null | cond-mat.mes-hall cond-mat.supr-con | null | We investigate a superconducting quantum interference device (SQUID) based on
carbon nanotubes in a fork geometry [J.-P. Cleuziou {\it et al.}, Nature
Nanotechnology {\bf 1}, 53 (2006)], involving tunneling of evanescent
quasiparticles through a superconductor over a distance comparable to the
superconducting coherence length, with therefore ``non local'' processes
generalizing non local Andreev reflection and elastic cotunneling. Non local
processes induce a reduction of the critical current and modify the
current-phase relation. We discuss arbitrary interface transparencies. Such
devices in fork geometries are candidates for probing the phase coherence of
crossed Andreev reflection.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:24:17 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 13:28:14 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Duhot",
"S.",
""
],
[
"Mélin",
"R.",
""
]
] |
0705.4216 | Antoine Van Proeyen | Jan De Rydt, Jan Rosseel, Torsten T. Schmidt, Antoine Van Proeyen and
Marco Zagermann | Symplectic structure of N=1 supergravity with anomalies and Chern-Simons
terms | 27 pages; v2: typos corrected; version to be published in
Class.Quantum Grav | Class.Quant.Grav.24:5201-5220,2007 | 10.1088/0264-9381/24/20/017 | MPP-2007-61, KUL-TF-07/11 | hep-th hep-ph | null | The general actions of matter-coupled N=1 supergravity have Peccei-Quinn
terms that may violate gauge and supersymmetry invariance. In addition, N=1
supergravity with vector multiplets may also contain generalized Chern-Simons
terms. These have often been neglected in the literature despite their
importance for gauge and supersymmetry invariance. We clarify the interplay of
Peccei-Quinn terms, generalized Chern-Simons terms and quantum anomalies in the
context of N=1 supergravity and exhibit conditions that have to be satisfied
for their mutual consistency. This extension of the previously known N=1
matter-coupled supergravity actions follows naturally from the embedding of the
gauge group into the group of symplectic duality transformations. Our results
regarding this extension provide the supersymmetric framework for studies of
string compactifications with axionic shift symmetries, generalized
Chern-Simons terms and quantum anomalies.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:25:18 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 10:23:43 GMT"
}
] | 2009-12-15T00:00:00 | [
[
"De Rydt",
"Jan",
""
],
[
"Rosseel",
"Jan",
""
],
[
"Schmidt",
"Torsten T.",
""
],
[
"Van Proeyen",
"Antoine",
""
],
[
"Zagermann",
"Marco",
""
]
] |
0705.4217 | Alexandre Zimmers | A. Zimmers, Y. Noat, T. Cren, W. Sacks, D. Roditchev, B. Liang, R. L.
Greene | Local tunneling spectroscopy of the electron-doped cuprate
Sm1.85Ce0.15CuO4 | null | null | 10.1103/PhysRevB.76.132505 | null | cond-mat.supr-con | null | We present local tunneling spectroscopy in the optimally electron-doped
cuprate Sm2-xCexCuO4 x=0.15. A clear signature of the superconducting gap is
observed with an amplitude ranging from place to place and from sample to
sample (Delta~3.5-6meV). Another spectroscopic feature is simultaneously
observed at high energy above \pm 50meV. Its energy scale and temperature
evolution is found to be compatible with previous photoemission and optical
experiments. If interpreted as the signature of antiferromagnetic order in the
samples, these results could suggest the coexistence on the local scale of
antiferromagnetism and superconductivity on the electron-doped side of cuprate
superconductors.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:31:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zimmers",
"A.",
""
],
[
"Noat",
"Y.",
""
],
[
"Cren",
"T.",
""
],
[
"Sacks",
"W.",
""
],
[
"Roditchev",
"D.",
""
],
[
"Liang",
"B.",
""
],
[
"Greene",
"R. L.",
""
]
] |
0705.4218 | Sandro Graffi | E.Caliceti, S.Graffi, J.Sjoestrand | $PT$ symmetric non-selfadjoint operators, diagonalizable and
non-diagonalizable, with real discrete spectrum | 20 pages | null | 10.1088/1751-8113/40/33/014 | null | math-ph math.MP | null | Consider in $L^2(R^d)$, $d\geq 1$, the operator family $H(g):=H_0+igW$. $\ds
H_0= a^\ast_1a_1+... +a^\ast_da_d+d/2$ is the quantum harmonic oscillator with
rational frequencies, $W$ a $P$ symmetric bounded potential, and $g$ a real
coupling constant. We show that if $|g|<\rho$, $\rho$ being an explicitly
determined constant, the spectrum of $H(g)$ is real and discrete. Moreover we
show that the operator $\ds H(g)=a^\ast_1 a_1+a^\ast_2a_2+ig a^\ast_2a_1$ has
real discrete spectrum but is not diagonalizable.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:33:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Caliceti",
"E.",
""
],
[
"Graffi",
"S.",
""
],
[
"Sjoestrand",
"J.",
""
]
] |
0705.4219 | Jonathan Roberts | S. F. King, J. P. Roberts and D. P. Roy | Natural Dark Matter in SUSY GUTs with Non-universal Gaugino Masses | 20 pages, 3 figures | JHEP0710:106,2007 | 10.1088/1126-6708/2007/10/106 | null | hep-ph | null | We consider neutralino dark matter within the framework of SUSY GUTs with
non-universal gaugino masses. In particular we focus on the case of SU(5) with
a SUSY breaking F-term in the 1, 24, 75 and 200 dimensional representations. We
discuss the 24 case in some detail, and show that the bulk dark matter region
cannot be accessed. We then go on to consider the admixture of the singlet SUSY
breaking F-term with one of the 24, 75 or 200 dimensional F-terms, and show
that in these cases it becomes possible to access the bulk regions
corresponding to low fine-tuned dark matter. Our results are presented in the
$(M_1,M_2)$ plane for fixed $M_3$ and so are useful for considering general GUT
models, as well as more general non-universal gaugino models.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:35:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"King",
"S. F.",
""
],
[
"Roberts",
"J. P.",
""
],
[
"Roy",
"D. P.",
""
]
] |
0705.4220 | Will Dison | Will Dison | An Isoperimetric Function for Bestvina-Brady Groups | 11 pages, 1 figure. Minor typos corrected and cosmetic changes made.
Final version | Bull. Lond. Math. Soc. 40 (2008), no. 3, 384-394 | 10.1112/blms/bdn019 | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a right-angled Artin group A, the associated Bestvina-Brady group is
defined to be the kernel of the homomorphism A \to \mathbb{Z} that maps each
generator in the standard presentation of A to a fixed generator of \mathbb{Z}.
We prove that the Dehn function of an arbitrary finitely presented
Bestvina-Brady group is bounded above by n^4. This is the best possible
universal upper bound.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:43:24 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Dec 2008 10:29:50 GMT"
}
] | 2008-12-17T00:00:00 | [
[
"Dison",
"Will",
""
]
] |
0705.4221 | Jonathan Touboul | Jonathan Touboul | Controllability of the heat and wave equations and their finite
difference approximations by the shape of the domain | 27 pages | null | null | null | math.AP math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we study a controllability problem for a parabolic and a
hyperbolic partial differential equations in which the control is the shape of
the domain where the equation holds. The quantity to be controlled is the trace
of the solution into an open subdomain and at a given time, when the right hand
side source term is known. The mapping that associates this trace to the shape
of the domain is nonlinear. We show (i) an approximate controllability property
for the linearized parabolic problem and (ii) an exact local controllability
property for the linearized and the nonlinear equations in the hyperbolic case.
We then address the same questions in the context of a finite difference
spatial semi-discretization in both the parabolic and hyperbolic problems. In
this discretized case again we prove a local controllability result for the
parabolic problem, and an exact controllability for the hyperbolic case,
applying a local surjectivity theorem together with a unique continuation
property of the underlying adjoint discrete system.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:54:21 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 09:32:04 GMT"
},
{
"version": "v3",
"created": "Tue, 6 Nov 2012 19:37:22 GMT"
}
] | 2012-11-07T00:00:00 | [
[
"Touboul",
"Jonathan",
""
]
] |
0705.4222 | Eran Segev | Eran Segev, Baleegh Abdo, Oleg Shtempluck, Eyal Buks | Stochastic Resonance with a Single Metastable State | null | null | 10.1103/PhysRevB.77.012501 | null | cond-mat.supr-con cond-mat.other | null | We study thermal instability in NbN superconducting stripline resonators. The
system exhibits extreme nonlinearity near a bifurcation, which separates a
monostable zone and an astable one. The lifetime of the metastable state, which
is locally stable in the monostable zone, is measure near the bifurcation and
the results are compared with a theory. Near bifurcation, where the lifetime
becomes relatively short, the system exhibits strong amplification of a weak
input modulation signal. We find that the frequency bandwidth of this
amplification mechanism is limited by the rate of thermal relaxation. When the
frequency of the input modulation signal becomes comparable or larger than this
rate the response of the system exhibits sub-harmonics of various orders.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:59:31 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Segev",
"Eran",
""
],
[
"Abdo",
"Baleegh",
""
],
[
"Shtempluck",
"Oleg",
""
],
[
"Buks",
"Eyal",
""
]
] |
0705.4223 | Michele Trenti | M. Trenti, S. Ransom, P. Hut and D. C. Heggie | Predictions for Triple Stars with and without a Pulsar in Star Clusters | 11 pages, minor changes to match MNRAS accepted version | null | 10.1111/j.1365-2966.2008.13285.x | null | astro-ph | null | Though about 80 pulsar binaries have been detected in globular clusters so
far, no pulsar has been found in a triple system in which all three objects are
of comparable mass. Here we present predictions for the abundance of such
triple systems, and for the most likely characteristics of these systems. Our
predictions are based on an extensive set of more than 500 direct simulations
of star clusters with primordial binaries, and a number of additional runs
containing primordial triples. Our simulations employ a number N_{tot} of equal
mass stars from N_{tot}=512 to N_{tot}=19661 and a primordial binary fraction
from 0-50%. In addition, we validate our results against simulations with
N=19661 that include a mass spectrum with a turn-off mass at 0.8 M_{sun},
appropriate to describe the old stellar populations of galactic globular
clusters. Based on our simulations, we expect that typical triple abundances in
the core of a dense cluster are two orders of magnitude lower than the binary
abundances, which in itself already suggests that we don't have to wait too
long for the first comparable-mass triple with a pulsar to be detected.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:14:52 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Apr 2008 18:30:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Trenti",
"M.",
""
],
[
"Ransom",
"S.",
""
],
[
"Hut",
"P.",
""
],
[
"Heggie",
"D. C.",
""
]
] |
0705.4224 | Antonio Pineda | Antonio Pineda | Non-relativistic Quantum Mechanics versus Quantum Field Theories | 4 pages, 6 figures. Invited talk given at 42nd Rencontres de Moriond
on QCD and High-Energy Hadronic Interactions, La Thuile, March 2007 | null | null | null | hep-ph | null | We briefly review the derivation of a non-relativistic quantum mechanics
description of a weakly bound non-relativistic system from the underlying
quantum field theory. We highlight the main techniques used.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:15:28 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Pineda",
"Antonio",
""
]
] |
0705.4225 | Gen Kimura | Gen Kimura, Hiromichi Ohno, Hiroyuki Hayashi | How to detect a possible correlation from the information of a
sub-system in quantum mechanical systems | 7 pages, 1 figure | Phys. Rev. A 76, 042123 (2007) | 10.1103/PhysRevA.76.042123 | null | quant-ph | null | A possibility to detect correlations between two quantum mechanical systems
only from the information of a subsystem is investigated. For generic cases, we
prove that there exist correlations between two quantum systems if the
time-derivative of the reduced purity is not zero. Therefore, an
experimentalist can conclude non-zero correlations between his/her system and
some environment if he/she finds the time-derivative of the reduced purity is
not zero. A quantitative estimation of a time-derivative of the reduced purity
with respect to correlations is also given. This clarifies the role of
correlations in the mechanism of decoherence in open quantum systems.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:16:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kimura",
"Gen",
""
],
[
"Ohno",
"Hiromichi",
""
],
[
"Hayashi",
"Hiroyuki",
""
]
] |
0705.4226 | Joachim De Lataillade | Joachim De Lataillade (PPS) | Second-Order Type Isomorphisms Through Game Semantics | accepted by Annals of Pure and Applied Logic, Special Issue on Game
Semantics | null | null | null | cs.LO | null | The characterization of second-order type isomorphisms is a purely
syntactical problem that we propose to study under the enlightenment of game
semantics. We study this question in the case of second-order
λ$\mu$-calculus, which can be seen as an extension of system F to
classical logic, and for which we define a categorical framework: control
hyperdoctrines. Our game model of λ$\mu$-calculus is based on polymorphic
arenas (closely related to Hughes' hyperforests) which evolve during the play
(following the ideas of Murawski-Ong). We show that type isomorphisms coincide
with the "equality" on arenas associated with types. Finally we deduce the
equational characterization of type isomorphisms from this equality. We also
recover from the same model Roberto Di Cosmo's characterization of type
isomorphisms for system F. This approach leads to a geometrical comprehension
on the question of second order type isomorphisms, which can be easily extended
to some other polymorphic calculi including additional programming features.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:26:26 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"De Lataillade",
"Joachim",
"",
"PPS"
]
] |
0705.4227 | Federico Urban | C. Bambi, F.R. Urban | Brane Cosmology and KK Gravitinos | 19 pages, references added, IoP style | JCAP0709:018,2007 | 10.1088/1475-7516/2007/09/018 | null | hep-ph astro-ph | null | The cosmology of KK gravitinos in models with extra dimensions is considered.
The main result is that the production of such KK modes is not compatible with
an epoch of non--standard expansion after inflation. This is so because the BBN
constraint on the zero mode forces the reduced five dimensional Planck mass
$M_5$ down to values much smaller than the usual four dimensional one, but this
in turn implies many KK states available for a given temperature. Once these
states are taken into account one finds that there is no $M_5$ for which the
produced KK gravitinos satisfy BBN and overclosure constraints. This conclusion
holds for both flat and warped models in which only gravity propagates in the
full spacetime.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:32:53 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 21:42:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bambi",
"C.",
""
],
[
"Urban",
"F. R.",
""
]
] |
0705.4228 | Joachim De Lataillade | Joachim De Lataillade (PPS) | Curry-style type Isomorphisms and Game Semantics | Accept\'e \`a Mathematical Structures for Computer Science, Special
Issue on Type Isomorphisms | null | null | null | cs.LO | null | Curry-style system F, ie. system F with no explicit types in terms, can be
seen as a core presentation of polymorphism from the point of view of
programming languages. This paper gives a characterisation of type isomorphisms
for this language, by using a game model whose intuitions come both from the
syntax and from the game semantics universe. The model is composed of: an
untyped part to interpret terms, a notion of game to interpret types, and a
typed part to express the fact that an untyped strategy plays on a game. By
analysing isomorphisms in the model, we prove that the equational system
corresponding to type isomorphisms for Curry-style system F is the extension of
the equational system for Church-style isomorphisms with a new, non-trivial
equation: forall X.A = A[forall Y.Y/X] if X appears only positively in A.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:31:02 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"De Lataillade",
"Joachim",
"",
"PPS"
]
] |
0705.4229 | Andrej Plecenik | M.Gregor, R. Micunek, T. Plecenik, T. Roch, A. Lugstein, E.
Bertagnolli, I.Vavra, M. Stefecka, M. Kubinec, M.Leporis, V. Gasparik, P.
Kus, and A. Plecenik | Superconducting MgB2 thin films nano-bridges for cryo-electronic
application | null | null | null | null | cond-mat.supr-con | null | Precursor MgB2 thin films were prepared on sapphire substrates by magnetron
sputtering. Influence of ex-situ annealing process on superconducting MgB2 thin
films roughness is discussed. Optimized annealing process of MgB precursor thin
films in vacuum results in smooth superconducting MgB2 thin films with
roughness below 10 nm, critical temperature Tcon = 31 K and transition width
DTc less than 1 K. Nano-bridges based on the superconducting MgB2 thin films
using optical and Focused Ion Beam lithography were prepared. Critical current
density jc (4.2 K) measured on 50 nm wide strip was 7.3x106 A/cm2 and no
significant loss of superconducting properties was detected. Resistance vs.
temperature and critical current vs. temperature characteristics were measured
on these structures using standard DC four probe measurements.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:31:56 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Gregor",
"M.",
""
],
[
"Micunek",
"R.",
""
],
[
"Plecenik",
"T.",
""
],
[
"Roch",
"T.",
""
],
[
"Lugstein",
"A.",
""
],
[
"Bertagnolli",
"E.",
""
],
[
"Vavra",
"I.",
""
],
[
"Stefecka",
"M.",
""
],
[
"Kubinec",
"M.",
""
],
[
"Leporis",
"M.",
""
],
[
"Gasparik",
"V.",
""
],
[
"Kus",
"P.",
""
],
[
"Plecenik",
"A.",
""
]
] |
0705.4230 | Aiyou Chen | Aiyou Chen, Peter J. Bickel | Efficient independent component analysis | Published at http://dx.doi.org/10.1214/009053606000000939 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2006, Vol. 34, No. 6, 2825-2855 | 10.1214/009053606000000939 | IMS-AOS-AOS0205 | stat.ME math.ST stat.ML stat.TH | null | Independent component analysis (ICA) has been widely used for blind source
separation in many fields such as brain imaging analysis, signal processing and
telecommunication. Many statistical techniques based on M-estimates have been
proposed for estimating the mixing matrix. Recently, several nonparametric
methods have been developed, but in-depth analysis of asymptotic efficiency has
not been available. We analyze ICA using semiparametric theories and propose a
straightforward estimate based on the efficient score function by using
B-spline approximations. The estimate is asymptotically efficient under
moderate conditions and exhibits better performance than standard ICA methods
in a variety of simulations.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:15:33 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 06:04:57 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Chen",
"Aiyou",
""
],
[
"Bickel",
"Peter J.",
""
]
] |
0705.4231 | Jamie Walls | Jamie D. Walls | Parametric spin excitations in lateral quantum dots | correct font in figure | null | 10.1103/PhysRevB.76.195307 | null | cond-mat.other cond-mat.mes-hall | null | In this work, the spin dynamics of a single electron under parametric
modulation of a lateral quantum dot's electrostatic potential in the presence
of spin-orbit coupling is investigated. Numerical and theoretical calculations
demonstrate that, by squeezing and/or moving the electron's wave function, spin
rotations with Rabi frequencies on the order of tens of megahertz can be
achieved with experimentally accessible parameters in both parabolic and square
lateral quantum dots. Applications of parametric excitations for determining
spin-orbit coupling parameters and for increasing the spin polarization in the
electronic ground are demonstrated.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:10:20 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 20:44:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Walls",
"Jamie D.",
""
]
] |
0705.4232 | Sergei Chekanov V. | S. Chekanov (for the ZEUS Collaboration) | First observation of (anti)deuterons in DIS | 4 pages, 4 eps figures. Proceedings of the XV International Workshop
on Deep Inelastic Scattering (DIS07 April 16-20, 2007, Munich, Germany) | null | null | null | hep-ex | null | First observation of (anti)deuterons in deep inelastic ep scattering (DIS)
measured with the ZEUS detector at HERA is reported. The production rate of
deuterons is higher than that of antideuterons. However, no asymmetry in the
production rate of protons and antiprotons was found. The (anti)deuteron yield
is approximately three orders of magnitude smaller than that of (anti)protons,
which is consistent with the world measurements.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:18:51 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Chekanov",
"S.",
"",
"for the ZEUS Collaboration"
]
] |
0705.4233 | Hiroyuki Yamase | Hiroyuki Yamase | Effect of magnetic field on spontaneous Fermi surface symmetry breaking | 28 pages, 9 figures | Phys. Rev. B 76, 155117 (2007) | 10.1103/PhysRevB.76.155117 | null | cond-mat.str-el | null | We study magnetic field effects on spontaneous Fermi surface symmetry
breaking with d-wave symmetry, the so-called d-wave "Pomeranchuk instability''.
We use a mean-field model of electrons with a pure forward scattering
interaction on a square lattice. When either the majority or the minority spin
band is tuned close to the van Hove filling by a magnetic field, the Fermi
surface symmetry breaking occurs in both bands, but with a different magnitude
of the order parameter. The transition is typically of second order at high
temperature and changes to first order at low temperature; the end points of
the second order line are tricritical points. This qualitative picture does not
change even in the limit of a large magnetic field, although the magnetic field
substantially suppresses the transition temperature at the van Hove filling.
The field produces neither a quantum critical point nor a quantum critical end
point in our model. In the weak coupling limit, typical quantities
characterizing the phase diagram have a field-independent single energy scale
while its dimensionless coefficient varies with the field. The field-induced
Fermi surface symmetry breaking is a promising scenario for the bilayer
ruthenate Sr3Ru2O7, and future issues are discussed to establish such a
scenario.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:18:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yamase",
"Hiroyuki",
""
]
] |
0705.4234 | Farzaneh Sheidaei | F. Sheidaei, M. Bahmanabadi, A. Keivani, M. Khakian Ghomi, J. Samimi,
and A. Shadkam | A Study on anisotropy of cosmic ray distribution with a small array of
water-cherenkov detectors | 16 pages 9 figs and one table | Phys.Rev.D76:082002,2007 | 10.1103/PhysRevD.76.082002 | null | astro-ph | null | The study of the anisotropy of the arrival directions is an essential tool to
investigate the origin and propagation of cosmic rays primaries. A simple way
of recording many cosmic rays is to record coincidences between a number of
detectors. We have monitored multi-TeV cosmic rays by a small array of water
cherenkov detectors in Tehran(35 43 N, 51 20 E, 1200m a.s.l). More than
1.1*10^6 extensive air shower events were recorded. In addition to the Compton-
Getting effect due to the motion of the earth in the Galaxy, an anisotropy has
been observed which is due to a unidirectional anisotropy of cosmic ray flow
along the Galactic arms.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:23:10 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Sheidaei",
"F.",
""
],
[
"Bahmanabadi",
"M.",
""
],
[
"Keivani",
"A.",
""
],
[
"Ghomi",
"M. Khakian",
""
],
[
"Samimi",
"J.",
""
],
[
"Shadkam",
"A.",
""
]
] |
0705.4235 | Ma Luo | Ma Luo, Zhibing Li, Chengguang Bao | Spin evolution of spin-1 Bose-Einstein condensates | 7 pages, 3 figures, | null | 10.1103/PhysRevA.77.043625 | null | physics.atm-clus | null | An analytical formula is obtained to describe the evolution of the average
populations of spin components of spin-1 atomic gases. The formula is derived
from the exact time-dependent solution of the Hamiltonian $H_{S}=c
mathbf{S}^{2}$ without using approximation. Therefore it goes beyond the mean
field theory and provides a general, accurate, and complete description for the
whole process of non-dissipative evolution starting from various initial
states. The numerical results directly given by the formula coincide
qualitatively well with existing experimental data, and also with other
theoretical results from solving dynamic differential equations. For some
special cases of initial state, instead of undergoing strong oscillation as
found previously, the evolution is found to go on very steadily in a very long
duration.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:24:49 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Luo",
"Ma",
""
],
[
"Li",
"Zhibing",
""
],
[
"Bao",
"Chengguang",
""
]
] |
0705.4236 | Nicholas J. Proudfoot | Nicholas J. Proudfoot | A survey of hypertoric geometry and topology | null | null | null | null | math.AG math.CO | null | Hypertoric varieties are quaternionic analogues of toric varieties, important
for their interaction with the combinatorics of matroids as well as for their
prominent place in the rapidly expanding field of algebraic symplectic and
hyperkahler geometry. The aim of this survey is to give clear definitions and
statements of known results, serving both as a reference and as a point of
entry to this beautiful subject.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:28:48 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Proudfoot",
"Nicholas J.",
""
]
] |
0705.4237 | Jeffrey Humpherys | Blake Barker, Jeffrey Humpherys, Keith Rudd, and Kevin Zumbrun | Stability of viscous shocks in isentropic gas dynamics | null | null | 10.1007/s00220-008-0487-4 | null | math.AP math.DS | null | In this paper, we examine the stability problem for viscous shock solutions
of the isentropic compressible Navier--Stokes equations, or $p$-system with
real viscosity. We first revisit the work of Matsumura and Nishihara, extending
the known parameter regime for which small-amplitude viscous shocks are
provably spectrally stable by an optimized version of their original argument.
Next, using a novel spectral energy estimate, we show that there are no purely
real unstable eigenvalues for any shock strength.
By related estimates, we show that unstable eigenvalues are confined to a
bounded region independent of shock strength. Then through an extensive
numerical Evans function study, we show that there is no unstable spectrum in
the entire right-half plane, thus demonstrating numerically that
large-amplitude shocks are spectrally stable up to Mach number $M\approx 3000$
for $1 \le \gamma \leq 3$. This strongly suggests that shocks are stable
independent of amplitude and the adiabatic constant $\gamma$. We complete our
study by showing that finite-difference simulations of perturbed
large-amplitude shocks converge to a translate of the original shock wave, as
expected.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:35:19 GMT"
}
] | 2017-06-12T00:00:00 | [
[
"Barker",
"Blake",
""
],
[
"Humpherys",
"Jeffrey",
""
],
[
"Rudd",
"Keith",
""
],
[
"Zumbrun",
"Kevin",
""
]
] |
0705.4238 | Daniel Gauthier | William R. LeFew, Stephanos Venakides, and Daniel J. Gauthier | Accurate description of optical precursors and their relation to
weak-field coherent optical transients | 11 pages, 4 figures | null | null | null | physics.optics physics.class-ph physics.med-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study theoretically the propagation of a step-modulated optical field as
it passes through a dispersive dielectric made up of a dilute collection of
oscillators characterized by a single narrow-band resonance. The propagated
field is given in terms of an integral of a Fourier type, which cannot be
evaluated even for simple models of the dispersive dielectric. The fact that
the oscillators have a low number density (dilute medium) and have a
narrow-band resonance allows us to simplify the integrand. In this case, the
integral can be evaluated exactly, although it is not possible using this
method to separate out the transient part of the propagated field known as
optical precursors. We also use an asymptotic method (saddle-point method) to
evaluate the integral. The contributions to the integral related to the
saddle-points of the integrand give rise to the optical precursors. We obtain
analytic expressions for the precursor fields and the domain over which the
asymptotic method is valid. When combined to obtain the total transient field,
we find that the agreement between the solutions obtained by the asymptotic and
the exact methods is excellent. Our results demonstrate that precursors can
persist for many nanoseconds and the chirp in the instantaneous frequency of
the precursors can manifest itself in beats in the transmitted intensity. Our
work strongly suggests that precursors have been observed in many previous
experiments.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:37:50 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Jun 2008 17:42:39 GMT"
},
{
"version": "v3",
"created": "Wed, 3 Jun 2009 21:29:21 GMT"
}
] | 2009-06-04T00:00:00 | [
[
"LeFew",
"William R.",
""
],
[
"Venakides",
"Stephanos",
""
],
[
"Gauthier",
"Daniel J.",
""
]
] |
0705.4239 | Alexandru Ionescu | A. D. Ionescu, C. E. Kenig, D. Tataru | Global well-posedness of the KP-I initial-value problem in the energy
space | null | null | 10.1007/s00222-008-0115-0 | null | math.AP | null | We prove that the KP-I initial value problem is globally well-posed in the
natural energy space of the equation.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:46:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ionescu",
"A. D.",
""
],
[
"Kenig",
"C. E.",
""
],
[
"Tataru",
"D.",
""
]
] |
0705.4240 | Nicola Bartolo | N. Bartolo (Physics Dept. and INFN, Padova, Italy), S. Matarrese
(Physics Dept. and INFN, Padova, Italy), A. Riotto (Dep. de Physique
Theorique, Geneva, Switzerland and INFN Padova, Italy), A. Vaihkonen (Dep. de
Physique Theorique, Geneva, Switzerland) | The Maximal Amount of Gravitational Waves in the Curvaton Scenario | 4 pages, laTeX; added a clarifying comment in the conclusions,
version matches publication in PRD, Rapid Communications | Phys.Rev.D76:061302,2007 | 10.1103/PhysRevD.76.061302 | null | astro-ph gr-qc hep-ph hep-th | null | The curvaton scenario for the generation of the cosmological curvature
perturbation on large scales represents an alternative to the standard
slow-roll scenario of inflation in which the observed density perturbations are
due to fluctuations of the inflaton field itself. Its basic assumption is that
the initial curvature perturbation due to the inflaton field is negligible.
This is attained by lowering the energy scale of inflation, thereby highly
suppressing the amount of gravitational waves produced during inflation. We
compute the power-spectrum of the gravitational waves generated at second order
in perturbation theory by the curvaton (isocurvature) perturbations between the
end of inflation and the curvaton decay. An interesting property of this
contribution to the tensor perturbations is that it is directly proportional to
the amount of non-Gaussianity predicted within the curvaton scenario. We show
that the spectrum of gravitational waves may be in the range of future
gravitational wave detectors.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:47:57 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Sep 2007 09:38:38 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Bartolo",
"N.",
"",
"Physics Dept. and INFN, Padova, Italy"
],
[
"Matarrese",
"S.",
"",
"Physics Dept. and INFN, Padova, Italy"
],
[
"Riotto",
"A.",
"",
"Dep. de Physique\n Theorique, Geneva, Switzerland and INFN Padova, Italy"
],
[
"Vaihkonen",
"A.",
"",
"Dep. de\n Physique Theorique, Geneva, Switzerland"
]
] |
0705.4241 | Thierry Ferrus | T. Ferrus, R. George, C. H. W. Barnes, N. Lumpkin, D. J. Paul and M.
Pepper | Variation of the hopping exponent in disordered silicon MOSFETs | 6 pages, 5 figures | J. Phys.: Condens. Matter 20, 415226 (2008) | 10.1088/0953-8984/20/41/415226 | null | cond-mat.str-el cond-mat.dis-nn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We observe a complex change in the hopping exponent value from 1/2 to 1/3 as
a function of disorder strength and electron density in a sodium-doped silicon
MOSFET. The disorder was varied by applying a gate voltage and thermally
drifting the ions to different positions in the oxide. The same gate was then
used at low temperature to modify the carrier concentration.
Magnetoconductivity measurements are compatible with a change in transport
mechanisms when either the disorder or the electron density is modified
suggesting a possible transition from a Mott insulator to an Anderson insulator
in these systems.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 16:28:18 GMT"
},
{
"version": "v10",
"created": "Sat, 27 Sep 2008 00:21:27 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 11:10:59 GMT"
},
{
"version": "v3",
"created": "Mon, 18 Jun 2007 19:22:13 GMT"
},
{
"version": "v4",
"created": "Thu, 28 Jun 2007 10:24:03 GMT"
},
{
"version": "v5",
"created": "Fri, 13 Jul 2007 15:54:08 GMT"
},
{
"version": "v6",
"created": "Wed, 24 Oct 2007 10:54:23 GMT"
},
{
"version": "v7",
"created": "Wed, 7 Nov 2007 17:30:42 GMT"
},
{
"version": "v8",
"created": "Wed, 19 Mar 2008 12:39:20 GMT"
},
{
"version": "v9",
"created": "Wed, 3 Sep 2008 15:38:57 GMT"
}
] | 2008-09-27T00:00:00 | [
[
"Ferrus",
"T.",
""
],
[
"George",
"R.",
""
],
[
"Barnes",
"C. H. W.",
""
],
[
"Lumpkin",
"N.",
""
],
[
"Paul",
"D. J.",
""
],
[
"Pepper",
"M.",
""
]
] |
0705.4242 | Fabrice Silva | Fabrice Silva (LMA), Jean Kergomard (LMA), Christophe Vergez (LMA) | Oscillation thresholds for "strinking outwards" reeds coupled to a
resonator | null | null | null | null | physics.class-ph | null | This paper considers a "striking outwards" reed coupled to a resonator. This
expression, due to Helmholtz, is not discussed here : it corresponds to the
most common model of a lip-type valve, when the valve is assumed to be a one
degree of freedom oscillator. The presented work is an extension of the works
done by Wilson and Beavers (1974), Tarnopolsky (2000). The range of the playing
frequencies is investigated. The first results are analytical : when no losses
are present in the resonator, it is proven that the ratio between the threshold
frequency and the reed resonance frequency is found to be necessarily within
the interval between unity and the square root of 3. This is a musical sixth.
Actually the interval is largely smaller, and this is in accordance with e.g.
the results by Cullen et al.. The smallest blowing pressure is found to be
directly related to the quality factor of the reed. Numerical results confirm
these statements, and are discussed in comparison with previous ones by Cullen
et al (2000).
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:50:37 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Silva",
"Fabrice",
"",
"LMA"
],
[
"Kergomard",
"Jean",
"",
"LMA"
],
[
"Vergez",
"Christophe",
"",
"LMA"
]
] |
0705.4243 | Steffen Wirth | Sahana Roessler, S. Ernst, B. Padmanabhan, Suja Elizabeth, H. L. Bhat,
F. Steglich, S. Wirth | Polaronic state and nanometer-scale phase separation in colossal
magnetoresistive manganites | null | null | 10.1209/0295-5075/83/17009 | null | cond-mat.str-el | null | High resolution topographic images obtained by scanning tunneling microscope
in the insulating state of Pr0.68Pb0.32MnO3 single crystals showed regular
stripe-like or zigzag patterns on a width scale of 0.4 - 0.5 nm confirming a
high temperature polaronic state. Spectroscopic studies revealed inhomogeneous
maps of zero-bias conductance with small patches of metallic clusters on length
scale of 2 - 3 nm only within a narrow temperature range close to the
metal-insulator transition. The results give a direct observation of polarons
in the insulating state, phase separation of nanometer-scale metallic clusters
in the paramagnetic metallic state, and a homogeneous ferromagnetic state.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:58:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Roessler",
"Sahana",
""
],
[
"Ernst",
"S.",
""
],
[
"Padmanabhan",
"B.",
""
],
[
"Elizabeth",
"Suja",
""
],
[
"Bhat",
"H. L.",
""
],
[
"Steglich",
"F.",
""
],
[
"Wirth",
"S.",
""
]
] |
0705.4244 | Jeffrey Humpherys | Jeffrey Humpherys, Olivier Laffite, and Kevin Zumbrun | Stability of isentropic viscous shock profiles in the high-Mach number
limit | null | null | 10.1007/s00220-009-0885-2 | null | math.AP | null | By a combination of asymptotic ODE estimates and numerical Evans function
calculations, we establish stability of viscous shock solutions of the
isentropic compressible Navier--Stokes equations with $\gamma$-law pressure (i)
in the limit as Mach number $M$ goes to infinity, for any $\gamma\ge 1$ (proved
analytically), and (ii) for $M\ge 2,500$, $\gamma\in [1,2.5]$ (demonstrated
numerically). This builds on and completes earlier studies by
Matsumura--Nishihara and Barker--Humpherys--Rudd--Zumbrun establishing
stability for low and intermediate Mach numbers, respectively, indicating
unconditional stability, independent of shock amplitude, of viscous shock waves
for $\gamma$-law gas dynamics in the range $\gamma \in [1,2.5]$. Other
$\gamma$-values may be treated similarly, but have not been checked
numerically. The main idea is to establish convergence of the Evans function in
the high-Mach number limit to that of a pressureless, or ``infinitely
compressible'', gas with additional upstream boundary condition determined by a
boundary-layer analysis. Recall that low-Mach number behavior is
incompressible.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 15:58:18 GMT"
}
] | 2017-06-09T00:00:00 | [
[
"Humpherys",
"Jeffrey",
""
],
[
"Laffite",
"Olivier",
""
],
[
"Zumbrun",
"Kevin",
""
]
] |
0705.4245 | Aline Kurtzmann | A. Kurtzmann | The ODE method for some self-interacting diffusions on non-compact
spaces | revised version | null | null | null | math.PR | null | Self-interacting diffusions are solutions to SDEs with a drift term depending
on the process and its normalized occupation measure $\mu_t$ (via an
interaction potential and a confinement potential). We establish a relation
between the asymptotic behavior of $\mu_t$ and the asymptotic behavior of a
deterministic dynamical flow (defined on the space of the Borel probability
measures). We extend previous results on $\mathbb{R}^d$ or more generally a
smooth complete connected Riemannian manifold without boundary. We will also
give some sufficient conditions for the convergence of $\mu_t$. Finally, we
will illustrate our study with an example on $\mathbb{R}^2$.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 16:02:29 GMT"
},
{
"version": "v2",
"created": "Tue, 13 Nov 2007 11:59:45 GMT"
},
{
"version": "v3",
"created": "Sun, 17 Feb 2008 12:05:05 GMT"
}
] | 2008-02-17T00:00:00 | [
[
"Kurtzmann",
"A.",
""
]
] |
0705.4246 | Nicholas Touikan | Nicholas W M Touikan | The equation w(x,y)=u over free groups | 1 Figure. Modifications made after referee comments | J. Group Theory, 12 (2009), no 4, 611 -- 634 | 10.1515/JGT.2008.100 | null | math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the theory developed by Olga Kharlampovich, Alexei Miasnikov, and,
independently, by Zlil Sela to describe the set of homomorphisms of a f.g.
group G into a free group F, we describe the solutions to equations with
coefficients from F and unknowns x,y of the form w(x,y) = u, where u lies in F
and w(x,y) is a word in {x,y}^\{pm 1}. We also give an example of a single
equation whose solutions cannot be described with only one "level" of
automorphisms.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 16:06:23 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 01:43:29 GMT"
},
{
"version": "v3",
"created": "Fri, 1 Jun 2007 18:48:53 GMT"
},
{
"version": "v4",
"created": "Thu, 15 Nov 2007 17:40:07 GMT"
},
{
"version": "v5",
"created": "Thu, 25 Sep 2008 21:41:14 GMT"
}
] | 2014-03-27T00:00:00 | [
[
"Touikan",
"Nicholas W M",
""
]
] |
0705.4247 | Sergiy Akkelin | S. V. Akkelin | Characteristic length of dynamical reduction models and decay of
cosmological vacuum | 9 pages, minor corrections, comments are welcome | null | null | null | quant-ph astro-ph gr-qc | null | Characteristic length of mass density resolution in dynamical reduction
models is calculated utilizing energy conservation law and viable cosmological
model with decreasing energy density of vacuum (dark energy density). The value
found, $ \sim 10^{-5}$ cm, numerically coincides with phenomenological spatial
short-length cutoff parameter introduced in the Ghirardi-Rimini-Weber model. It
seems that our results support the gravity induced mechanism of dynamical
reduction.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 16:14:52 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 17:42:43 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Jun 2007 14:07:25 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Akkelin",
"S. V.",
""
]
] |
0705.4248 | Bart Cleuren | B. Cleuren and C. Van den Broeck | Fluctuation theorem for black-body radiation | 4 pages, 3 figures | null | 10.1209/0295-5075/79/30001 | null | cond-mat.stat-mech | null | The fluctuation theorem is verified for black-body radiation, provided the
bunching of photons is taken into account appropriately.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 16:29:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cleuren",
"B.",
""
],
[
"Broeck",
"C. Van den",
""
]
] |
0705.4249 | Betty Tsang | M. Mocko, M. B. Tsang, Z.Y. Sun, L. Andronenko, M. Andronenko, F.
Delaunay, M. Famiano, W. A. Friedman, V. Henzl, D. Henzlova, H. Hui, X. D.
Liu, S. Lukyanov, W. G. Lynch, A. M. Rogers, and M. S. Wallace | Extrapolation of neutron-rich isotope cross-sections from projectile
fragmentation | accepted for publication in Europhysics Letters | Europhys.Lett.79:12001,2007 | 10.1209/0295-5075/79/12001 | null | nucl-ex | null | Using the measured fragmentation cross sections produced from the 48Ca and
64Ni beams at 140 MeV per nucleon on 9Be and 181Ta targets, we find that the
cross sections of unmeasured neutron rich nuclei can be extrapolated using a
systematic trend involving the average binding energy. The extrapolated
cross-sections will be very useful in planning experiments with neutron rich
isotopes produced from projectile fragmentation. The proposed method is general
and could be applied to other fragmentation systems including those used in
other radioactive ion beam facilities.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 16:30:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mocko",
"M.",
""
],
[
"Tsang",
"M. B.",
""
],
[
"Sun",
"Z. Y.",
""
],
[
"Andronenko",
"L.",
""
],
[
"Andronenko",
"M.",
""
],
[
"Delaunay",
"F.",
""
],
[
"Famiano",
"M.",
""
],
[
"Friedman",
"W. A.",
""
],
[
"Henzl",
"V.",
""
],
[
"Henzlova",
"D.",
""
],
[
"Hui",
"H.",
""
],
[
"Liu",
"X. D.",
""
],
[
"Lukyanov",
"S.",
""
],
[
"Lynch",
"W. G.",
""
],
[
"Rogers",
"A. M.",
""
],
[
"Wallace",
"M. S.",
""
]
] |
0705.4250 | Tijmen Euser | Tijmen G. Euser, Hong Wei, Jeroen Kalkman, Yoonho Jun, Albert Polman,
David J. Norris, and Willem L. Vos | Ultrafast optical switching of three-dimensional Si inverse opal
photonic band gap crystals | null | J. Appl. Phys. 102, 053111 (2007) (6 pages) | 10.1063/1.2777134 | null | physics.optics | null | We present ultrafast optical switching experiments on 3D photonic band gap
crystals. Switching the Si inverse opal is achieved by optically exciting free
carriers by a two-photon process. We probe reflectivity in the frequency range
of second order Bragg diffraction where the photonic band gap is predicted. We
find good experimental switching conditions for free-carrier plasma frequencies
between 0.3 and 0.7 times the optical frequency: we thus observe a large
frequency shift of up to D omega/omega= 1.5% of all spectral features including
the peak that corresponds to the photonic band gap. We deduce a corresponding
large refractive index change of Dn'_Si/n'_Si= 2.0% and an induced absorption
length that is longer than the sample thickness. We observe a fast decay time
of 21 ps, which implies that switching could potentially be repeated at GHz
rates. Such a high switching rate is relevant to future switching and
modulation applications.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:04:22 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jul 2007 08:18:31 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Sep 2007 07:42:39 GMT"
}
] | 2007-09-19T00:00:00 | [
[
"Euser",
"Tijmen G.",
""
],
[
"Wei",
"Hong",
""
],
[
"Kalkman",
"Jeroen",
""
],
[
"Jun",
"Yoonho",
""
],
[
"Polman",
"Albert",
""
],
[
"Norris",
"David J.",
""
],
[
"Vos",
"Willem L.",
""
]
] |
0705.4251 | Luciano da Fontoura Costa | Luciano da F. Costa and Roberto F. S. Andrade | What are the Best Hierarchical Descriptors for Complex Networks? | 9 pages, 4 figures | New J. Phys. 9 (2007) 311 | 10.1088/1367-2630/9/9/311 | null | cond-mat.dis-nn cond-mat.stat-mech | null | This work reviews several hierarchical measurements of the topology of
complex networks and then applies feature selection concepts and methods in
order to quantify the relative importance of each measurement with respect to
the discrimination between four representative theoretical network models,
namely Erd\"{o}s-R\'enyi, Barab\'asi-Albert, Watts-Strogatz as well as a
geographical type of network. The obtained results confirmed that the four
models can be well-separated by using a combination of measurements. In
addition, the relative contribution of each considered feature for the overall
discrimination of the models was quantified in terms of the respective weights
in the canonical projection into two dimensions, with the traditional
clustering coefficient, hierarchical clustering coefficient and neighborhood
clustering coefficient resulting particularly effective. Interestingly, the
average shortest path length and hierarchical node degrees contributed little
for the separation of the four network models.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 16:52:44 GMT"
}
] | 2007-09-19T00:00:00 | [
[
"Costa",
"Luciano da F.",
""
],
[
"Andrade",
"Roberto F. S.",
""
]
] |
0705.4252 | Masamune Oguri | Masamune Oguri | Is There a Quad Problem among Optical Gravitational Lenses? | 9 pages, 4 figures, invited contribution to appear in New Journal of
Physics (Focus on Gravitational Lensing) | New J.Phys.9:442,2007 | 10.1088/1367-2630/9/12/442 | null | astro-ph | null | Most of optical gravitational lenses recently discovered in the Sloan Digital
Sky Survey Quasar Lens Search (SQLS) have two-images rather than four-images,
in marked contrast to radio lenses for which the fraction of four-image lenses
(quad fraction) is quite high. We revisit the quad fraction among optical
lenses by taking the selection function of the SQLS into account. We find that
the current observed quad fraction in the SQLS is indeed lower than, but
consistent with, the prediction of our theoretical model. The low quad fraction
among optical lenses, together with the high quad fraction among radio lenses,
implies that the quasar optical luminosity function has a relatively shallow
faint end slope.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:06:47 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Oguri",
"Masamune",
""
]
] |
0705.4253 | Ciamac Moallemi | Ciamac C. Moallemi and Benjamin Van Roy | Convergence of the Min-Sum Algorithm for Convex Optimization | null | null | null | null | math.OC | null | We establish that the min-sum message-passing algorithm and its asynchronous
variants converge for a large class of unconstrained convex optimization
problems.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:31:03 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Moallemi",
"Ciamac C.",
""
],
[
"Van Roy",
"Benjamin",
""
]
] |
0705.4254 | Pavlo Zubko | P. Zubko, G. Catalan, A. Buckley, P. R. L. Welche, J. F. Scott | Strain gradient induced polarization in SrTiO3 single crystals | 4 pages, 3 figures, 1 table | Phys. Rev. Lett. 99, 167601 (2007) | 10.1103/PhysRevLett.99.167601 | null | cond-mat.mtrl-sci | null | Piezoelectricity is inherent only in noncentrosymmetric materials, but a
piezoelectric response can also be obtained in centrosymmetric crystals if
subjected to inhomogeneous deformation. This phenomenon, known as
flexoelectricity, affects the functional properties of insulators, particularly
thin films of high permittivity materials. We have measured
strain-gradient-induced polarization in single crystals of paraelectric
SrTiO$_3$ as a function of temperature and orientation down to and below the
105 K phase transition. Estimates were obtained for all the components of the
flexoelectric tensor, and calculations based on these indicate that local
polarization around defects in SrTiO$_3$ may exceed the largest ferroelectric
polarizations. A sign reversal of the flexoelectric response detected below the
phase transition suggests that the ferroelastic domain walls of SrTiO$_3$ may
be polar.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:36:48 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 14:53:12 GMT"
}
] | 2007-10-22T00:00:00 | [
[
"Zubko",
"P.",
""
],
[
"Catalan",
"G.",
""
],
[
"Buckley",
"A.",
""
],
[
"Welche",
"P. R. L.",
""
],
[
"Scott",
"J. F.",
""
]
] |
0705.4255 | Rafael Bautista-Mena | Rafael Bautista-Mena | Alice and Bob and Hendrik | 6 pages, 1 figure | null | null | null | physics.gen-ph physics.ed-ph | null | This paper offers an alternative approach to discussing both the principle of
relativity and the derivation of the Lorentz transformations. This approach
uses the idea that there may not be a preferred inertial frame through a
privileged access to information about events. In classroom discussions, it has
been my experience that this approach produces some lively arguments.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:40:08 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 20:52:34 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Bautista-Mena",
"Rafael",
""
]
] |
0705.4256 | Derrick Hart | Derrick Hart (University of Missouri - Columbia), Alex Iosevich
(University of Missouri - Columbia) | Sums and products in finite fields: an integral geometric viewpoint | null | null | null | null | math.NT math.CA | null | We prove that if $A \subset {\Bbb F}_q$ is such that
$$|A|>q^{{1/2}+\frac{1}{2d}},$$ then $${\Bbb F}_q^{*} \subset dA^2=A^2+...+A^2
d \text{times},$$ where $$A^2=\{a \cdot a': a,a' \in A\},$$ and where ${\Bbb
F}_q^{*}$ denotes the multiplicative group of the finite field ${\Bbb F}_q$. In
particular, we cover ${\Bbb F}_q^{*}$ by $A^2+A^2$ if $|A|>q^{{3/4}}$.
Furthermore, we prove that if $$|A| \ge
C_{size}^{\frac{1}{d}}q^{{1/2}+\frac{1}{2(2d-1)}},$$ then $$|dA^2| \ge q \cdot
\frac{C^2_{size}}{C^2_{size}+1}.$$
Thus $dA^2$ contains a positive proportion of the elements of ${\Bbb F}_q$
under a considerably weaker size assumption.We use the geometry of ${\Bbb
F}_q^d$, averages over hyper-planes and orthogonality properties of character
sums. In particular, we see that using operators that are smoothing on $L^2$ in
the Euclidean setting leads to non-trivial arithmetic consequences in the
context of finite fields.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:45:38 GMT"
},
{
"version": "v2",
"created": "Sun, 10 Jun 2007 13:04:04 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Jun 2007 12:42:56 GMT"
},
{
"version": "v4",
"created": "Wed, 27 Jun 2007 14:45:37 GMT"
}
] | 2007-06-27T00:00:00 | [
[
"Hart",
"Derrick",
"",
"University of Missouri - Columbia"
],
[
"Iosevich",
"Alex",
"",
"University of Missouri - Columbia"
]
] |
0705.4257 | Boris Kunyavskii | B. E. Kunyavskii and M. A. Tsfasman | Brauer-Siegel theorem for elliptic surfaces | 10 pages | null | null | null | math.AG math.NT | null | We consider higher-dimensional analogues of the classical Brauer-Siegel
theorem focusing on the case of abelian varieties over global function fields.
We prove such an analogue in the case of constant families of elliptic curves
and abelian varieties.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:50:43 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Dec 2007 14:22:20 GMT"
}
] | 2007-12-25T00:00:00 | [
[
"Kunyavskii",
"B. E.",
""
],
[
"Tsfasman",
"M. A.",
""
]
] |
0705.4258 | Wieslaw Sobk\'ow | S. Ciechanowicz (University of Wroclaw, Poland), W. Sobkow (University
of Wroclaw, Poland), M. Misiaszek (Jagiellonian University, Poland) | Decay of polarized muon at rest as a source of polarized neutrino beam | elsart style, 11 pages, 2 eps figures, submitted do publication | Physics Letters B 713, 258 (2012) | 10.1016/j.physletb.2012.06.008 | null | hep-ph | null | In this paper, we indicate the theoretical possibility of using the decay of
polarized muons at rest as a source of the transversely polarized electron
antineutrino beam. Such a beam can be used to probe new effects beyond standard
model. We mean here new tests concerning CP violation, Lorentz structure and
chirality structure of the charged current weak interactions. The main goal is
to show how the energy and angular distribution of the electron antineutrinos
in the muon rest frame depends on the transverse components of the antineutrino
beam polarization. Our analysis is model-independent and consistent with the
current upper limits on the non-standard couplings. The results are presented
in a limit of infinitesimally small mass for all particles produced in the
decay.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:51:27 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ciechanowicz",
"S.",
"",
"University of Wroclaw, Poland"
],
[
"Sobkow",
"W.",
"",
"University\n of Wroclaw, Poland"
],
[
"Misiaszek",
"M.",
"",
"Jagiellonian University, Poland"
]
] |
0705.4259 | Dominic van der Zypen | Michael E. Adams, Dominic van der Zypen | Representable posets and their order components | 06D50 | null | null | null | math.LO | null | A partially ordered set P is representable if there is a bounded distributive
lattice such that its ordered set of prime ideals is order-isomorphic to P. We
show that if the order components of a poset P are representable, then so is P.
Moreover, we provide an example disproving the converse.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:53:18 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Adams",
"Michael E.",
""
],
[
"van der Zypen",
"Dominic",
""
]
] |
0705.4260 | Ian Appelbaum | Biqin Huang (1), Douwe J. Monsma (2), Ian Appelbaum (1) ((1)
University of Delaware, (2) Cambridge NanoTech Inc.) | Experimental realization of a silicon spin field-effect transistor | null | Appl. Phys. Lett. 91, 072501 (2007) | 10.1063/1.2770656 | null | cond-mat.mtrl-sci cond-mat.other | null | A longitudinal electric field is used to control the transit time (through an
undoped silicon vertical channel) of spin-polarized electrons precessing in a
perpendicular magnetic field. Since an applied voltage determines the final
spin direction at the spin detector and hence the output collector current,
this comprises a spin field-effect transistor. An improved hot-electron spin
injector providing ~115% magnetocurrent, corresponding to at least ~38%
electron current spin polarization after transport through 10 microns undoped
single-crystal silicon, is used for maximum current modulation.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:09:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Huang",
"Biqin",
""
],
[
"Monsma",
"Douwe J.",
""
],
[
"Appelbaum",
"Ian",
""
]
] |
0705.4261 | - Departement Mathematiques Orsay | Jean-Pierre Kahane (LM-Orsay), Yitzhak Katznelson (U STANFORD) | Entiers al\'eatoires, ensembles de Sidon, densit\'e dans le groupe de
Bohr et ensembles d'analyticit\'e | null | null | null | null | math.CA math.PR | null | We study properties of a sequence $\Lambda$ obtained by a randomselection of
integers $n$, where $n\in\Lambda$ with probability $\varpi_{n}$, independently
of the other choices. We distinguish two cases : if
$\limsup_{n\to\infty}n\varpi_{n}<\infty$, $\Lambda$ is a.s. a Sidon set,
non-dense in the Bohr group ; if $\lim_{n\to\infty}n\varpi_{n}=\infty$, then
$\Lambda$ is a.s. a set of analyticity and is dense in the Bohr group.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 17:59:38 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Kahane",
"Jean-Pierre",
"",
"LM-Orsay"
],
[
"Katznelson",
"Yitzhak",
"",
"U STANFORD"
]
] |
0705.4262 | Frank H. Lutz | Frank H. Lutz and G\"unter M. Ziegler | A Small Polyhedral Z-Acyclic 2-Complex in R4 | 3 pages, 3 figures, submitted to Electronic Geometry Models | null | null | null | math.MG math.AG | null | We present a small 4-dimensional polyhedral realization of a 2-dimensional
Z-acyclic but non-contractible simplicial complex.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:18:17 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Lutz",
"Frank H.",
""
],
[
"Ziegler",
"Günter M.",
""
]
] |
0705.4263 | Erin Wells Bonning | E. W. Bonning (Observatoire de Paris-Meudon), G. A. Shields
(University of Texas at Austin), S. Salviander (University of Texas at
Austin) | Recoiling Black Holes in Quasars | 4 pages, 4 figures, uses emulateapj, Submitted to ApJ Letters | Astrophys.J.666:L13-L16,2007 | 10.1086/521674 | null | astro-ph | null | Recent simulations of merging black holes with spin give recoil velocities
from gravitational radiation up to several thousand km/s. A recoiling
supermassive black hole can retain the inner part of its accretion disk,
providing fuel for a continuing QSO phase lasting millions of years as the hole
moves away from the galactic nucleus. One possible observational manifestation
of a recoiling accretion disk is in QSO emission lines shifted in velocity from
the host galaxy. We have examined QSOs from the Sloan Digital Sky Survey with
broad emission lines substantially shifted relative to the narrow lines. We
find no convincing evidence for recoiling black holes carrying accretion disks.
We place an upper limit on the incidence of recoiling black holes in QSOs of 4%
for kicks greater than 500 km/s and 0.35% for kicks greater than 1000 km/s
line-of-sight velocity.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:08:42 GMT"
}
] | 2011-03-28T00:00:00 | [
[
"Bonning",
"E. W.",
"",
"Observatoire de Paris-Meudon"
],
[
"Shields",
"G. A.",
"",
"University of Texas at Austin"
],
[
"Salviander",
"S.",
"",
"University of Texas at\n Austin"
]
] |
0705.4264 | Antonio Pich | Antonio Pich | The Standard Model of Electroweak Interactions | Updated version of the lectures given at the 2006 European School of
High Energy Physics (Aronsborg, Sweden, 18 June - 1 July 2006) and at the 4th
CERN - CLAF School of High Energy Physics (Vina del Mar, Chile, 18 February -
3 March 2007). 50 pages, 36 figures | null | null | IFIC/07-27, FTUV/07-0529 | hep-ph hep-ex | null | Gauge invariance is a powerful tool to determine the dynamics of the
electroweak and strong forces. The particle content, structure and symmetries
of the Standard Model Lagrangian are discussed. Special emphasis is given to
the many phenomenological tests which have established this theoretical
framework as the Standard Theory of electroweak interactions.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:09:11 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Pich",
"Antonio",
""
]
] |
0705.4265 | Lon-Chang Liu | B. G. Giraud and Lon-chang Liu | Retrieving Nuclear Information from Protons Propagating through A Thick
Target | 29 pages, 13 figures | Phys.Rev.C75:064615,2007 | 10.1103/PhysRevC.75.064615 | LA-UR-07-0113 | nucl-th | null | The multiple scattering of high-energy particles in a thick target is
fromulated in an impact parameter representation. A formalism similar but not
identical to that of Moliere is obtained. We show that calculations of particle
beam broadening due to multiple Coulomb scattering alone can be given in closed
form. The focus of this study is on whether or not the broadening of the
Coulomb angular distribution prevents the retrieval of nuclear-interaction
information from mesauring the angular distributions of charged partiles
scattered from a thick target. For this purpose, we study multiple scatterings
with both the nuclear and Coulomb interactions included and we do not make a
small-angle expansion. Condition for retrieving nuclear infomration from
high-energy protons propagating through a block of material are obtained.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:31:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Giraud",
"B. G.",
""
],
[
"Liu",
"Lon-chang",
""
]
] |
0705.4266 | Alejandro Gangui | Alejandro Gangui | El universo de Einstein: 1905 - annus mirabilis - 2005 | Conference proceedings for the year-long program of conferences "El
universo de Einstein: 1905 - annus mirabilis - 2005" held in Buenos Aires
every Thursday from March to November 2005. Published in Spanish by Editorial
EUDEBA 2007. Some of the conferences are also available at
http://www.universoeinstein.com.ar/, both in PDF and Audio files | null | null | UEinstein/2007 | physics.hist-ph astro-ph hep-th physics.pop-ph | null | Year 2005 was the World Year of Physics, and it was commemorated worldwide as
the 100th anniversary of Albert Einstein's legendary works in which the
foundations of at least three areas of modern physics were laid: statistical
mechanics, quantum mechanics and special relativity. These works turned year
1905 in what deservedly was called the "miraculous year" (annus mirabilis) of
Einstein. However, the influence of this great mind was not limited to science.
As it is well known, his fingerprint remains engraved in many aspects of our
daily life. Because of that, in this work we have tried to cover almost all the
subjects in which Einstein was involved during the last century and, of course,
try and reveal the future projection his actions will have in this new century
that has just begun. Among the subjects covered in the volume one can find the
possible connection between Einstein and the artistic vanguard movement, his
religiosity, his days in Argentina, the Nobel Prize, the Einstein-Freud
correspondence, his pacifism and the nuclear energy, science and politics under
the Second Empire and the Weimar Republic, and even a description of his
patents and experiments, the studies performed to search for "built-in"
features in his brain and the doubts many had regarding whether Einstein was a
genius or a crank. Also included are essays on Einstein and Borges, philosophy
and relativity, Mach's principle, the relation among science, arts and
humanities, and, closer to Einstein's own theoretical research, the twin
paradox, chance and quantum mechanics, the arrow of time, gravitational lenses,
string theory, holography and black holes, gravitomagnetism, superconductivity,
gravitational waves, the photoelectric effect and the alternative theories for
gravitation.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:32:35 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 21:00:11 GMT"
}
] | 2007-06-19T00:00:00 | [
[
"Gangui",
"Alejandro",
""
]
] |
0705.4267 | Alexei Semikhatov | AM Semikhatov (Lebedev Physics Institute) | Factorizable ribbon quantum groups in logarithmic conformal field
theories | 27pp., amsart++, xy. v2: references added, some other minor additions | Theor.Math.Phys.154:433-453,2008 | 10.1007/s11232-008-0037-4 | null | hep-th math.QA | null | We review the properties of quantum groups occurring as Kazhdan--Lusztig dual
to logarithmic conformal field theory models. These quantum groups at even
roots of unity are not quasitriangular but are factorizable and have a ribbon
structure; the modular group representation on their center coincides with the
representation on generalized characters of the chiral algebra in logarithmic
conformal field models.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:17:20 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 17:01:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Semikhatov",
"AM",
"",
"Lebedev Physics Institute"
]
] |
0705.4268 | Sarah Livia Zerbes | Sarah Livia Zerbes | Higher exponential maps and explicit reciprocity laws I | Withdrawn as it is superseded by arXiv:0806.2122. | null | null | null | math.NT | null | This paper has been withdrawn, as it is superseded by arXiv:0806.2122
(Bloch-Kato exponential maps for local fields with imperfect residue fields),
which is a more recent version of the same paper.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:33:39 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Feb 2008 12:58:58 GMT"
},
{
"version": "v3",
"created": "Mon, 3 May 2010 20:16:05 GMT"
},
{
"version": "v4",
"created": "Wed, 5 May 2010 12:18:29 GMT"
}
] | 2010-05-06T00:00:00 | [
[
"Zerbes",
"Sarah Livia",
""
]
] |
0705.4269 | Sarah Livia Zerbes | Sarah Livia Zerbes | The higher Hilbert pairing via (phi,G)-modules | 23 pages | null | null | null | math.NT | null | We prove the Tate duality for higher dimensional local fields of mixed
characteristic (0,p), when p is an odd prime, using the theory of higher fields
of norms. Assuming that p is not ramified in the basefield, we then use this
construction to define the higher Hilbert pairing. In particular, we show that
the Hilbert pairing is non-degenerate, and we re-discover the formulae of
Brueckner and Vostokov.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:39:13 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Zerbes",
"Sarah Livia",
""
]
] |
0705.4270 | Dominic van der Zypen | Dominic van der Zypen | Order convergence and compactness | 3 pages | null | null | null | math.LO | null | Let $(P,\leq)$ be a partially ordered set and let $\tau$ be a compact
topology on $P$ that is finer than the interval topology. Then $\tau$ is
contained in the order (convergence) topology on $(P,\tau)$. So any Priestley
topology is contained in the order topology.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:40:54 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 16:14:09 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"van der Zypen",
"Dominic",
""
]
] |
0705.4271 | Mark Demers | Henk Bruin, Mark Demers, Ian Melbourne | Existence and convergence properties of physical measures for certain
dynamical systems with holes | 44 pages. Major addition: this paper now treats Collet-Eckmann maps
with singularities | Ergodic Theory Dyn. Syst. 30 (2010) 687-728 | null | null | math.DS math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two classes of dynamical systems with holes: expanding maps of the
interval and Collet-Eckmann maps with singularities. In both cases, we prove
that there is a natural absolutely continuous conditionally invariant measure
$\mu$ (a.c.c.i.m.) with the physical property that strictly positive H\"{o}lder
continuous functions converge to the density of $\mu$ under the renormalized
dynamics of the system. In addition, we construct an invariant measure $\nu$,
supported on the Cantor set of points that never escape from the system, that
is ergodic and enjoys exponential decay of correlations for H\"{o}lder
observables. We show that $\nu$ satisfies an equilibrium principle which
implies that the escape rate formula, familiar to the thermodynamic formalism,
holds outside the usual setting. In particular, it holds for Collet-Eckmann
maps with holes, which are not uniformly hyperbolic and do not admit a finite
Markov partition.
We use a general framework of Young towers with holes and first prove results
about the \accim and the invariant measure on the tower. Then we show how to
transfer results to the original dynamical system. This approach can be
expected to generalize to other dynamical systems than the two above classes.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:42:04 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Sep 2008 13:38:42 GMT"
}
] | 2014-12-09T00:00:00 | [
[
"Bruin",
"Henk",
""
],
[
"Demers",
"Mark",
""
],
[
"Melbourne",
"Ian",
""
]
] |
0705.4272 | S. A. Belbas | S. A. Belbas | Optimal control of Goursat-Volterra systems | 71 pages | null | null | null | math.OC math.CA | null | We analyze an optimal control problem for systems of integral equations of
Volterra type with two independent variables. These systems generalize both,
the hyperbolic control problems for systems of Goursat-Darboux type, and the
optimal control of ordinary (i.e. with one independent variable) Volterra
integral equations. We prove extremal principles akin to Pontryagin's maximum
principle.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:53:48 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Belbas",
"S. A.",
""
]
] |
0705.4273 | Svetlana Jorstad | Svetlana G. Jorstad, Alan P. Marscher, Jason A. Stevens, Paul S.
Smith, James R. Forster, Walter K. Gear, Timothy V. Cawthorne, Matthew L.
Lister, Alastair M. Stirling, Jos\'e L. G\'omez, Jane S. Greaves, and E. Ian
Robson | Multiwaveband Polarimetric Observations of 15 Active Galactic Nuclei at
High Frequencies: Correlated Polarization Behavior | 63 pages, 17 figures, 13 tables, in press AJ | Astron.J.134:799-824,2007 | 10.1086/519996 | null | astro-ph | null | We report on multi-frequency linear polarization monitoring of 15 active
galactic nuclei containing highly relativistic jets with apparent speeds from
$\sim$4 $c$ to $>40c$. The measurements were obtained at optical, 1 mm, and 3
mm wavelengths, and at 7 mm with the Very Long Baseline Array. The data show a
wide range in degree of linear polarization among the sources, from $<$1% to
$>$30%, and interday polarization variability in individual sources. The
polarization properties suggest separation of the sample into three groups with
low, intermediate, and high variability of polarization in the core at 7 mm :
LVP, IVP, and HVP, respectively. The groups are partially associated with the
common classification of active galactic nuclei as radio galaxies and quasars
with low optical polarization (LVP), BL Lacertae objects (IVP), and highly
optically polarized quasars (HVP). Our study investigates correlations between
total flux, fractional polarization, and polarization position angle at the
different wavelengths. We interpret the polarization properties of the sources
in the sample through models in which weak shocks compress turbulent plasma in
the jet. The differences in the orientation of sources with respect to the
observer, jet kinematics, and abundance of thermal matter external to the jet
near the core can account for the diversity in the polarization properties. The
results provide strong evidence that the optical polarized emission originates
in shocks, most likely situated between the 3 mm and 7 mm VLBI cores. They also
support the idea that the 1 mm core lies at the edge of the transition zone
between electromagnetically dominated and turbulent hydrodynamical sections of
the jet.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:55:47 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Jorstad",
"Svetlana G.",
""
],
[
"Marscher",
"Alan P.",
""
],
[
"Stevens",
"Jason A.",
""
],
[
"Smith",
"Paul S.",
""
],
[
"Forster",
"James R.",
""
],
[
"Gear",
"Walter K.",
""
],
[
"Cawthorne",
"Timothy V.",
""
],
[
"Lister",
"Matthew L.",
""
],
[
"Stirling",
"Alastair M.",
""
],
[
"Gómez",
"José L.",
""
],
[
"Greaves",
"Jane S.",
""
],
[
"Robson",
"E. Ian",
""
]
] |
0705.4274 | Brian Thomas | Brian C. Thomas (Washburn Univ.), Adrian L. Melott (Univ. of Kansas),
Brian D. Fields (Univ. of Illinois), and Barbara J. Anthony-Twarog (Univ. of
Kansas) | Superluminous supernovae: No threat from Eta Carinae | 19 pages, 2 figures; Revised version as accepted for publication in
Astrobiology | Astrobiology. February 1, 2008, 8(1): 9-16. | 10.1089/ast.2007.0181 | null | astro-ph physics.ao-ph q-bio.PE | null | Recently Supernova 2006gy was noted as the most luminous ever recorded, with
a total radiated energy of ~10^44 Joules. It was proposed that the progenitor
may have been a massive evolved star similar to eta Carinae, which resides in
our own galaxy at a distance of about 2.3 kpc. eta Carinae appears ready to
detonate. Although it is too distant to pose a serious threat as a normal
supernova, and given its rotation axis is unlikely to produce a Gamma-Ray Burst
oriented toward the Earth, eta Carinae is about 30,000 times nearer than
2006gy, and we re-evaluate it as a potential superluminous supernova. We find
that given the large ratio of emission in the optical to the X-ray, atmospheric
effects are negligible. Ionization of the atmosphere and concomitant ozone
depletion are unlikely to be important. Any cosmic ray effects should be spread
out over ~10^4 y, and similarly unlikely to produce any serious perturbation to
the biosphere. We also discuss a new possible effect of supernovae, endocrine
disruption induced by blue light near the peak of the optical spectrum. This is
a possibility for nearby supernovae at distances too large to be considered
"dangerous" for other reasons. However, due to reddening and extinction by the
interstellar medium, eta Carinae is unlikely to trigger such effects to any
significant degree.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:56:18 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 03:46:36 GMT"
}
] | 2008-02-23T00:00:00 | [
[
"Thomas",
"Brian C.",
"",
"Washburn Univ."
],
[
"Melott",
"Adrian L.",
"",
"Univ. of Kansas"
],
[
"Fields",
"Brian D.",
"",
"Univ. of Illinois"
],
[
"Anthony-Twarog",
"Barbara J.",
"",
"Univ. of\n Kansas"
]
] |
0705.4275 | Kaushik Bhattacharya | Kaushik Bhattacharya | Solution of the Dirac equation in presence of an uniform magnetic field | 16 pages latex file. Some errors corrected and some new material
added | null | null | null | hep-th astro-ph quant-ph | null | In this work we discuss the properties of the solutions of the Dirac equation
in presence of an uniform background magnetic field. In particular we focus on
the nature of the solutions, their ortho-normality properties and how these
solutions depend on the choice of the vector potential giving rise to the
magnetic field. We explicitly calculate the spin-sum of the solutions and using
it we calculate the propagator of the electron in presence of an uniform
background magnetic field.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:10:01 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 22:45:44 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Bhattacharya",
"Kaushik",
""
]
] |
0705.4276 | Pamela Morehouse | M. Artuso, et al, CLEO Collaboration | Evidence for the Decay D^0 --> K^_pi^+pi^-e^+nu_e | 9 pages postscript,also available through
http://www.lns.cornell.edu/public/CLNS/2007/, submitted to PRL | Phys.Rev.Lett.99:191801,2007 | 10.1103/PhysRevLett.99.191801 | CLNS 07/1994, CLEO 07-4 | hep-ex | null | Using a 281 pb^{-1} data sample collected at the psi(3770) with the CLEO-c
detector, we present the first absolute branching fraction measurement of the
decay D^0 rightarrow K^-pi^+pi^-e^+nu_e at a statistical significance of about
4.0 standard deviations. We find 10 candidates consistent with the decay D^0
rightarrow K^-pi^+pi^- e^+nu_e. The probability that a background fluctuation
accounts for this signal is less than 4.1 times 10^{-5}. We find {cal B}(D^0
rightarrow K^-pi^+pi^-e^+nu_e)= [2.8 ^{+1.4}_{-1.1}{rm (stat)} pm 0.3{rm
(syst)}] times 10 ^{-4}. This channel is consistent with being predominantly
produced through D^0 rightarrow K1^- e^+nu_e. By restricting the invariant mass
of the hadronic system to be consistent with K1, we obtain the product of
branching fractions {cal B}(D^0 rightarrow K1^- e^+nu_e)cdot{\cal B}(K1 to
K^-pi^+pi^-)=[2.5^{+1.3}_{-1.0}{rm(stat)} pm 0.2 {rm (syst)}]times 10^{-4}.
Using {cal B}(K1 to K^-pi^+pi^-) = (33 pm 3) %, we obtain {cal B}(D^0 to
K1^-e^+nu_e)=[7.6^{+4.1}_{-3.0}{rm (stat)} pm 0.6{rm (syst)}pm 0.7 ]times
10^{-4}. The last error accounts for the uncertainties in the measured konem to
K^-pi^+pi^- branching fraction.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:23:58 GMT"
}
] | 2010-04-08T00:00:00 | [
[
"Artuso",
"M.",
""
],
[
"Collaboration",
"CLEO",
""
]
] |
0705.4277 | Nico Spronk | Brian E. Forrest, Ebrahim Samei, Nico Spronk | Convolutions on compact groups and Fourier algebras of coset spaces | 26 pages. Some typos corrected, some new results on spectral sets
added | null | null | null | math.FA | null | In this note we study two related questions. (1) For a compact group G, what
are the ranges of the convolution maps on A(GXG) given for u,v in A(G) by $u X
v |-> u*v' ($v'(s)=v(s^{-1})$) and $u X v |-> u*v$? (2) For a locally compact
group G and a compact subgroup K, what are the amenability properties of the
Fourier algebra of the coset space A(G/K)? The algebra A(G/K) was defined and
studied by the first named author.
In answering the first question, we obtain for compact groups which do not
admit an abelian subgroup of finite index, some new subalgebras of A(G). Using
those algebras we can find many instances in which A(G/K) fails the most
rudimentary amenability property: operator weak amenability. However, using
different techniques, we show that if the connected component of the identity
of G is abelian, then A(G/K) always satisfies the stronger property that it is
hyper-Tauberian, which is a concept developed by the second named author. We
also establish a criterion which characterises operator amenability of A(G/K)
for a class of groups which includes the maximally almost periodic groups.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:24:21 GMT"
},
{
"version": "v2",
"created": "Fri, 23 May 2008 18:33:15 GMT"
}
] | 2008-05-23T00:00:00 | [
[
"Forrest",
"Brian E.",
""
],
[
"Samei",
"Ebrahim",
""
],
[
"Spronk",
"Nico",
""
]
] |
0705.4278 | Ra\'ul Labb\'e | R. Labb\'e | Optimal estimate of probability density functions from experimental data | 3 pages, 2 figures | null | null | null | physics.data-an | null | A method providing optimal estimate of probability density functions (PDFs)
from time series is proposed. It allows almost arbitrary resolution PDFs when
applied to either, sampled analytic functions or digitized data from
experiments. When results are compared with PDFs of the same data calculated
using the standard histogram method, a remarkable improvement is observed,
especially in far lateral regions of the PDF, where low probability events give
poor statistics.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:29:13 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Labbé",
"R.",
""
]
] |
0705.4279 | Nico Spronk | Mahya Ghandehari (Waterloo), Hamed Hatami (Toronto), Nico Spronk
(Waterloo) | Amenability constants for semilattice algebras | 18 pages. Results generalised to non-unital semilattices. Some errors
corrected | null | null | null | math.FA | null | For any finite unital commutative idempotent semigroup S, a unital
semilattice, we show how to compute the amenability constant of its semigroup
algebra l^1(S), which is always of the form 4n+1. We then show that these give
lower bounds to amenability constants of certain Banach algebras graded over
semilattices. We show that there is no commutative semilattice with amenability
constant between 5 and 9.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:30:25 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Aug 2007 18:53:23 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Ghandehari",
"Mahya",
"",
"Waterloo"
],
[
"Hatami",
"Hamed",
"",
"Toronto"
],
[
"Spronk",
"Nico",
"",
"Waterloo"
]
] |
0705.4280 | Dmitri Kharzeev | D. Kharzeev and K. Tuchin | Bulk viscosity of QCD matter near the critical temperature | 8 pages, 1 figure | JHEP0809:093,2008 | 10.1088/1126-6708/2008/09/093 | BNL/NT-07/23, RBRC-681 | hep-ph hep-lat nucl-ex nucl-th | null | Kubo's formula relates bulk viscosity to the retarded Green's function of the
trace of the energy-momentum tensor. Using low energy theorems of QCD for the
latter we derive the formula which relates the bulk viscosity to the energy
density and pressure of hot matter. We then employ the available lattice QCD
data to extract the bulk viscosity as a function of temperature. We find that
close to the deconfinement temperature bulk viscosity becomes large, with
viscosity-to-entropy ratio zeta/s about 1.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:34:29 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 20:38:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kharzeev",
"D.",
""
],
[
"Tuchin",
"K.",
""
]
] |
0705.4281 | Robert Brownlee | R. A. Brownlee, W. A. Light | Approximation orders for interpolation by surface splines to rough
functions | 18 pages | IMA J. Numer. Anal., 24(2):179-192, 2004 | null | MA-04-11, University of Leicester, UK | math.NA | null | In this paper we consider the approximation of functions by radial basis
function interpolants. There is a plethora of results about the asymptotic
behaviour of the error between appropriately smooth functions and their
interpolants, as the interpolation points fill out a bounded domain in R^d. In
all of these cases, the analysis takes place in a natural function space
dictated by the choice of radial basis function - the native space. In many
cases, the native space contains functions possessing a certain amount of
smoothness. We address the question of what can be said about these error
estimates when the function being interpolated fails to have the required
smoothness. These are the rough functions of the title. We limit our discussion
to surface splines, as an exemplar of a wider class of radial basis functions,
because we feel our techniques are most easily seen and understood in this
setting.
| [
{
"version": "v1",
"created": "Wed, 30 May 2007 16:37:55 GMT"
}
] | 2007-12-02T00:00:00 | [
[
"Brownlee",
"R. A.",
""
],
[
"Light",
"W. A.",
""
]
] |
0705.4282 | David Poulin | Robin Blume-Kohout, Hui Khoon Ng, David Poulin, and Lorenza Viola | The structure of preserved information in quantum processes | null | Phys. Rev. Lett. 100 030501 (2008) | 10.1103/PhysRevLett.100.030501 | null | quant-ph | null | We introduce a general operational characterization of information-preserving
structures (IPS) -- encompassing noiseless subsystems, decoherence-free
subspaces, pointer bases, and error-correcting codes -- by demonstrating that
they are isometric to fixed points of unital quantum processes. Using this, we
show that every IPS is a matrix algebra. We further establish a structure
theorem for the fixed states and observables of an arbitrary process, which
unifies the Schrodinger and Heisenberg pictures, places restrictions on
physically allowed kinds of information, and provides an efficient algorithm
for finding all noiseless and unitarily noiseless subsystems of the process.
| [
{
"version": "v1",
"created": "Wed, 30 May 2007 16:37:50 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Oct 2007 16:49:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Blume-Kohout",
"Robin",
""
],
[
"Ng",
"Hui Khoon",
""
],
[
"Poulin",
"David",
""
],
[
"Viola",
"Lorenza",
""
]
] |
0705.4283 | Danilo Marchesini | Danilo Marchesini, Pieter van Dokkum (Yale University) | Assessing the Predictive Power of Galaxy Formation Models: A Comparison
of Predicted and Observed Rest-Frame Optical Luminosity Functions at
2.0<z<3.3 | 4 pages, 3 figures. Accepted for publication in the Astrophysical
Journal Letters. Minor corrections to match published version | Astrophys. J. 663 (2007) L89-L92 | 10.1086/520084 | null | astro-ph | null | Recent galaxy formation models successfully reproduce the local luminosity
function (LF) of galaxies by invoking mechanisms to suppress star formation in
low- and high-mass galaxies. As these models are optimized to fit the LF at low
redshift, a crucial question is how well they predict the LF at earlier times.
Here we compare recently measured rest-frame V-band LFs of galaxies at
redshifts 2.0<z<3.3 to predictions of semianalytic models by De Lucia & Blaizot
and Bower et al. and hydrodynamic simulations by Dave et al.. The models
succeed for some luminosity and redshift ranges and fail for others. A notable
success is that the Bower et al. model provides a good match to the observed LF
at z~3. However, all models predict an increase with time of the rest-frame
V-band luminosity density, whereas the observations show a decrease. The models
also have difficulty matching the observed rest-frame colors of galaxies. In
all models the luminosity density of red galaxies increases sharply from z~3 to
z~2.2, whereas it is approximately constant in the observations. Conversely, in
the models the luminosity density of blue galaxies is approximately constant,
whereas it decreases in the observations. These discrepancies cannot be
entirely remedied by changing the treatment of dust and suggest that current
models do not yet provide a complete description of galaxy formation and
evolution since z~3.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:00:05 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 15:16:59 GMT"
}
] | 2008-01-07T00:00:00 | [
[
"Marchesini",
"Danilo",
"",
"Yale University"
],
[
"van Dokkum",
"Pieter",
"",
"Yale University"
]
] |
0705.4284 | Yutaka Fujita | Yutaka Fujita (Osaka), Kazunori Kohri (Lancaster), Ryo Yamazaki
(Hiroshima), and Motoki Kino (JAXA) | Nonthermal Emission Associated with Strong AGN Outbursts at the Centers
of Galaxy Clusters | Accepted for publication in ApJL | Astrophys.J.663:L61-L64,2007 | 10.1086/520337 | null | astro-ph | null | Recently, strong AGN outbursts at the centers of galaxy clusters have been
found. Using a simple model, we study particle acceleration around a shock
excited by an outburst and estimate nonthermal emission from the accelerated
particles. We show that emission from secondary electrons is consistent with
the radio observations of the minihalo in the Perseus cluster, if there was a
strong AGN outburst >~10^8 yrs ago with an energy of ~1.8x10^62 erg. The
validity of our model depends on the frequency of the large outbursts. We also
estimate gamma-ray emission from the accelerated particles and show that it
could be detected with GLAST.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:00:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fujita",
"Yutaka",
"",
"Osaka"
],
[
"Kohri",
"Kazunori",
"",
"Lancaster"
],
[
"Yamazaki",
"Ryo",
"",
"Hiroshima"
],
[
"Kino",
"Motoki",
"",
"JAXA"
]
] |
0705.4285 | Daniel Fabrycky | Daniel Fabrycky and Scott Tremaine | Shrinking binary and planetary orbits by Kozai cycles with tidal
friction | Submitted to ApJ; 18 pages, 10 figures | Astrophys.J.669:1298-1315,2007 | 10.1086/521702 | null | astro-ph | null | At least two arguments suggest that the orbits of a large fraction of binary
stars and extrasolar planets shrank by 1-2 orders of magnitude after formation:
(i) the physical radius of a star shrinks by a large factor from birth to the
main sequence, yet many main-sequence stars have companions orbiting only a few
stellar radii away, and (ii) in current theories of planet formation, the
region within ~0.1 AU of a protostar is too hot and rarefied for a Jupiter-mass
planet to form, yet many "hot Jupiters" are observed at such distances. We
investigate orbital shrinkage by the combined effects of secular perturbations
from a distant companion star (Kozai oscillations) and tidal friction. We
integrate the relevant equations of motion to predict the distribution of
orbital elements produced by this process. Binary stars with orbital periods of
0.1 to 10 days, with a median of ~2 d, are produced from binaries with much
longer periods (10 d to 10^5 d), consistent with observations indicating that
most or all short-period binaries have distant companions (tertiaries). We also
make two new testable predictions: (1) For periods between 3 and 10 d, the
distribution of the mutual inclination between the inner binary and the
tertiary orbit should peak strongly near 40 deg and 140 deg. (2) Extrasolar
planets whose host stars have a distant binary companion may also undergo this
process, in which case the orbit of the resulting hot Jupiter will typically be
misaligned with the equator of its host star.
| [
{
"version": "v1",
"created": "Wed, 30 May 2007 19:18:33 GMT"
}
] | 2011-03-04T00:00:00 | [
[
"Fabrycky",
"Daniel",
""
],
[
"Tremaine",
"Scott",
""
]
] |
0705.4286 | Dominic van der Zypen | Dominic van der Zypen | Remarks on affine complete distributive lattices | 7 pages | null | null | null | math.LO | null | We characterise the Priestley spaces corresponding to affine complete bounded
distributive lattices. Moreover we prove that the class of affine complete
bounded distributive lattices is closed under products and free products. We
show that every (not necessarily bounded) distributive lattice can be embedded
in an affine complete one and that $\mathbb{Q} \cap [0,1]$ is initial in the
class of affine complete lattices.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:03:33 GMT"
}
] | 2007-05-31T00:00:00 | [
[
"van der Zypen",
"Dominic",
""
]
] |
0705.4287 | Bart Willems | B. Willems (1), V. Kalogera (1), A. Vecchio (1,2), N. Ivanova (3),
F.A. Rasio (1), J.M. Fregeau (1), K. Belczynski (4) ((1) Northwestern U., (2)
U. of Birmingham, (3) U. of Toronto, (4) New Mexico State U.) | Eccentric double white dwarfs as LISA sources in globular clusters | Published in ApJ 665, L59 | null | 10.1086/521049 | null | astro-ph gr-qc | null | We consider the formation of double white dwarfs (DWDs) through dynamical
interactions in globular clusters. Such interactions can give rise to eccentric
DWDs, in contrast to the exclusively circular population expected to form in
the Galactic disk. We show that for a 5-year Laser Interferometer Space Antenna
(LISA) mission and distances as far as the Large Magellanic Cloud, multiple
harmonics from eccentric DWDs can be detected at a signal-to-noise ratio higher
than 8 for at least a handful of eccentric DWDs, given their formation rate and
typical lifetimes estimated from current cluster simulations. Consequently the
association of eccentricity with stellar-mass LISA sources does not uniquely
involve neutron stars, as is usually assumed. Due to the difficulty of
detecting (eccentric) DWDs with present and planned electromagnetic
observatories, LISA could provide unique dynamical identifications of these
systems in globular clusters.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:06:52 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 17:46:07 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Jan 2008 18:48:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Willems",
"B.",
""
],
[
"Kalogera",
"V.",
""
],
[
"Vecchio",
"A.",
""
],
[
"Ivanova",
"N.",
""
],
[
"Rasio",
"F. A.",
""
],
[
"Fregeau",
"J. M.",
""
],
[
"Belczynski",
"K.",
""
]
] |
0705.4288 | Heather Knutson | Heather A. Knutson, David Charbonneau, Drake Deming, and L. Jeremy
Richardson | A Ground-Based Search for Thermal Emission from the Exoplanet TrES-1 | 10 pages, 1 table, four figures, accepted for publication in PASP | null | 10.1086/520098 | null | astro-ph | null | Eclipsing planetary systems give us an important window on extrasolar planet
atmospheres. By measuring the depth of the secondary eclipse, when the planet
moves behind the star, we can estimate the strength of the thermal emission
from the day side of the planet. Attaining a ground-based detection of one of
these eclipses has proven to be a significant challenge, as time-dependent
variations in instrument throughput and atmospheric seeing and absorption
overwhelm the small signal of the eclipse at infrared wavelengths. We gathered
a series of simultaneous L grism spectra of the transiting planet system TrES-1
and a nearby comparison star of comparable brightness, allowing us to correct
for these effects in principle. Combining the data from two eclipses, we
demonstrate a detection sensitivity of 0.15% in the eclipse depth relative to
the stellar flux. This approaches the sensitivity required to detect the
planetary emission, which theoretical models predict should lie between
0.05-0.1% of the stellar flux in our 2.9-4.3 micron bandpass. We explore the
factors that ultimately limit the precision of this technique, and discuss
potential avenues for future improvements.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:08:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Knutson",
"Heather A.",
""
],
[
"Charbonneau",
"David",
""
],
[
"Deming",
"Drake",
""
],
[
"Richardson",
"L. Jeremy",
""
]
] |
0705.4289 | Tomasz Magulski | Tomasz Magulski, {\L}ukasz Or{\l}owski | Geometric-Algebra Quantum-Like Algorithms: Simon's Algorithm | 11 pages, 6 tables | null | null | null | quant-ph | null | This is continuation of the approach to performing quantum algorithms using
geometric structures which was presented by Aerts and Czachor. We solve the
Simon's problem which, next to the Shor's alghorithm, is a representative of a
quantum hidden subgroup class. We also highlight some advantages resulting from
the fact that no quantum mechanics is involved.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:12:49 GMT"
}
] | 2007-05-31T00:00:00 | [
[
"Magulski",
"Tomasz",
""
],
[
"Orłowski",
"Łukasz",
""
]
] |
0705.4290 | David Lafreni\`ere | David Lafreniere, Rene Doyon, Christian Marois, Daniel Nadeau, Ben R.
Oppenheimer, Patrick F. Roche, Francois Rigaut, James R. Graham, Ray
Jayawardhana, Doug Johnstone, Paul G. Kalas, Bruce Macintosh and Rene Racine | The Gemini Deep Planet Survey -- GDPS | Accepted for publication in ApJ | null | 10.1086/522826 | null | astro-ph | null | We present the results of the Gemini Deep Planet Survey, a near-infrared
adaptive optics search for giant planets and brown dwarfs around nearby young
stars. The observations were obtained with the Altair adaptive optics system at
the Gemini North telescope and angular differential imaging was used to
suppress the speckle noise of the central star. Detection limits for the 85
stars observed are presented, along with a list of all faint point sources
detected around them. Typically, the observations are sensitive to angular
separations beyond 0.5" with 5-sigma contrast sensitivities in magnitude
difference at 1.6 micron of 9.5 at 0.5", 12.9 at 1", 15.0 at 2", and 16.5 at
5". For the typical target of the survey, a 100 Myr old K0 star located 22 pc
from the Sun, the observations are sensitive enough to detect planets more
massive than 2 Mjup with a projected separation in the range 40-200 AU. Second
epoch observations of 48 stars with candidates (out of 54) have confirmed that
all candidates are unrelated background stars. A detailed statistical analysis
of the survey results, yielding upper limits on the fractions of stars with
giant planet or low mass brown dwarf companions, is presented. Assuming a
planet mass distribution dN/dm m^{-1.2} and a semi-major axis distribution
dN/da a^{-1}, the 95% credible upper limits on the fraction of stars with at
least one planet of mass 0.5-13 Mjup are 0.28 for the range 10-25 AU, 0.13 for
25-50 AU, and 0.093 for 50-250 AU. The 95% credible interval for the fraction
of stars with at least one brown dwarf companion having a semi-major axis in
the range 25-250 AU is 0.019 (-0.015/+0.083), irrespective of any assumption on
the mass and semi-major axis distributions. The stars HD 14802, HD 166181, and
HD 213845 have been resolved into binaries for the first time.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:14:44 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Aug 2007 21:18:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lafreniere",
"David",
""
],
[
"Doyon",
"Rene",
""
],
[
"Marois",
"Christian",
""
],
[
"Nadeau",
"Daniel",
""
],
[
"Oppenheimer",
"Ben R.",
""
],
[
"Roche",
"Patrick F.",
""
],
[
"Rigaut",
"Francois",
""
],
[
"Graham",
"James R.",
""
],
[
"Jayawardhana",
"Ray",
""
],
[
"Johnstone",
"Doug",
""
],
[
"Kalas",
"Paul G.",
""
],
[
"Macintosh",
"Bruce",
""
],
[
"Racine",
"Rene",
""
]
] |
0705.4291 | Kamil Br\'adler | K. Bradler, R. Jauregui | Relativistically covariant state-dependent cloning of photons | corrected, rewritten and accepted in PRA | null | 10.1103/PhysRevA.77.042302 | null | quant-ph | null | The influence of the relativistic covariance requirement on the optimality of
the symmetric state-dependent 1 -> 2 cloning machine is studied. Namely, given
a photonic qubit whose basis is formed from the momentum-helicity eigenstates,
the change to the optimal cloning fidelity is calculated taking into account
the Lorentz covariance unitarily represented by Wigner's little group. To
pinpoint some of the interesting results, we found states for which the optimal
fidelity of the cloning process drops to 2/3 which corresponds to the fidelity
of the optimal classical cloner. Also, an implication for the security of the
BB84 protocol is analyzed.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:16:03 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Jun 2007 21:21:28 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Feb 2008 21:54:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bradler",
"K.",
""
],
[
"Jauregui",
"R.",
""
]
] |
0705.4292 | Haim Diamant | Hamutal Bary-Soroker and Haim Diamant | Nanoscale surface relaxation of a membrane stack | 4 pages | Phys Rev E 76, 042401 (2007) | 10.1103/PhysRevE.76.042401 | null | cond-mat.soft | null | Recent measurements of the short-wavelength (~ 1--100 nm) fluctuations in
stacks of lipid membranes have revealed two distinct relaxations: a fast one
(decay rate of ~ 0.1 ns^{-1}), which fits the known baroclinic mode of bulk
lamellar phases, and a slower one (~ 1--10 \mu s^{-1}) of unknown origin. We
show that the latter is accounted for by an overdamped capillary mode,
depending on the surface tension of the stack and its anisotropic viscosity. We
thereby demonstrate how the dynamic surface tension of membrane stacks could be
extracted from such measurements.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:20:46 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Oct 2007 13:28:18 GMT"
}
] | 2007-10-25T00:00:00 | [
[
"Bary-Soroker",
"Hamutal",
""
],
[
"Diamant",
"Haim",
""
]
] |
0705.4293 | Mladen Georgiev | Mladen Georgiev and Fabio DeMatteis | Nonradiative DKR processes: revisiting the theory. III. Multimode
approaches | 16 pages including 3(5) tables, 2 appendices, and 4(5) figures, all
pdf format | null | null | null | cond-mat.mtrl-sci cond-mat.other | null | We outline a method for dealing with the relaxation of optically excited NaI
F centers in terms of a single effective frequency along a multimode
coordinate. The 2s-2p mixing through coupling to a T_{1u} vibrational mode is
also discussed with optimistic conclusions. Equilibrium nonradiative
deexcitation rates are estimated and compared with intervibrational relaxations
so as to assess the efficiency of the nonequilibrium DKR deexcitation. They
show the former not to be competitive, due to the large number of phonons
exchanged.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:31:21 GMT"
}
] | 2007-05-31T00:00:00 | [
[
"Georgiev",
"Mladen",
""
],
[
"DeMatteis",
"Fabio",
""
]
] |
0705.4294 | Dmitri Vassilevich | A. V. Strelchenko, D. V. Vassilevich | On space-time noncommutative theories at finite temperature | 24 pages, v2: minor changes | Phys.Rev.D76:065014,2007 | 10.1103/PhysRevD.76.065014 | IFUSP-1636/2007 | hep-th | null | We analyze renormalization and the high temperature expansion of the one-loop
effective action of the space-time noncommutative \phi^4 theory by using the
zeta function regularization in the imaginary time formalism (i.e., on S^1 x
R^3). Interestingly enough, there are no mixed (non-planar) contributions to
the counterterms as well as to the power-law high temperature asymptotics. We
also study the Wick rotation and formulate assumptions under which the real and
imaginary time formalisms are equivalent.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 20:32:13 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 20:33:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Strelchenko",
"A. V.",
""
],
[
"Vassilevich",
"D. V.",
""
]
] |
0705.4295 | Philipp Hagler | Ph. H\"agler, W. Schroers, J. Bratt, R.G. Edwards, M. Engelhardt, G.T.
Fleming, B. Musch, J.W. Negele, K. Orginos, A.V. Pochinsky, D.B. Renner, D.G.
Richards (LHPC Collaboration) | Nucleon Generalized Parton Distributions from Full Lattice QCD | 40 pages, 49 figures; Revised chiral extrapolations in sections A-K,
main conclusions unchanged | Phys.Rev.D77:094502,2008 | 10.1103/PhysRevD.77.094502 | DESY 07-077, JLAB-THY-07-651, TUM-T39-07-09 | hep-lat hep-ph nucl-th | null | We present a comprehensive study of the lowest moments of nucleon generalized
parton distributions in N_f=2+1 lattice QCD using domain wall valence quarks
and improved staggered sea quarks. Our investigation includes helicity
dependent and independent generalized parton distributions for pion masses as
low as 350 MeV and volumes as large as (3.5 fm)^3, for a lattice spacing of
0.124 fm. We use perturbative renormalization at one-loop level with an
improvement based on the non-perturbative renormalization factor for the axial
vector current, and only connected diagrams are included in the isosinglet
channel.
| [
{
"version": "v1",
"created": "Wed, 30 May 2007 16:55:06 GMT"
},
{
"version": "v2",
"created": "Wed, 7 May 2008 13:31:04 GMT"
}
] | 2015-03-13T00:00:00 | [
[
"Hägler",
"Ph.",
"",
"LHPC Collaboration"
],
[
"Schroers",
"W.",
"",
"LHPC Collaboration"
],
[
"Bratt",
"J.",
"",
"LHPC Collaboration"
],
[
"Edwards",
"R. G.",
"",
"LHPC Collaboration"
],
[
"Engelhardt",
"M.",
"",
"LHPC Collaboration"
],
[
"Fleming",
"G. T.",
"",
"LHPC Collaboration"
],
[
"Musch",
"B.",
"",
"LHPC Collaboration"
],
[
"Negele",
"J. W.",
"",
"LHPC Collaboration"
],
[
"Orginos",
"K.",
"",
"LHPC Collaboration"
],
[
"Pochinsky",
"A. V.",
"",
"LHPC Collaboration"
],
[
"Renner",
"D. B.",
"",
"LHPC Collaboration"
],
[
"Richards",
"D. G.",
"",
"LHPC Collaboration"
]
] |
0705.4296 | Ragnar Fleischmann | H. Hennig, R. Fleischmann, L. Hufnagel and T. Geisel | Fractal Conductance Fluctuations of Classical Origin | 5 pages, 4 figures, to appear in PRE | null | 10.1103/PhysRevE.76.015202 | null | cond-mat.mes-hall | null | In mesoscopic systems conductance fluctuations are a sensitive probe of
electron dynamics and chaotic phenomena. We show that the conductance of a
purely classical chaotic system with either fully chaotic or mixed phase space
generically exhibits fractal conductance fluctuations unrelated to quantum
interference. This might explain the unexpected dependence of the fractal
dimension of the conductance curves on the (quantum) phase breaking length
observed in experiments on semiconductor quantum dots.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 21:03:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hennig",
"H.",
""
],
[
"Fleischmann",
"R.",
""
],
[
"Hufnagel",
"L.",
""
],
[
"Geisel",
"T.",
""
]
] |
0705.4297 | David Milovich | David Milovich | Splitting families and the Noetherian type of $\beta\omega-\omega$ | This version accepted for publication by Journal of Symbolic Logic.
Fixed typos. Removed Lemma 5.10 due to bug in its proof | Journal of Symbolic Logic 73 (2008), no. 4, 1289--1306 | null | null | math.LO math.GN | null | Extending some results of Malykhin, we prove several independence results
about base properties of $\beta\omega-\omega$ and its powers, especially the
Noetherian type $Nt(\beta\omega-\omega)$, the least $\kappa$ for which
$\beta\omega-\omega$ has a base that is $\kappa$-like with respect to
containment. For example, $Nt(\beta\omega-\omega)$ is never less than the
splitting number, but can consistently be that $\omega_1$, $2^\omega$,
$(2^\omega)^+$, or strictly between $\omega_1$ and $2^\omega$.
$Nt(\beta\omega-\omega)$ is also consistently less than the additivity of the
meager ideal. $Nt(\beta\omega-\omega)$ is closely related to the existence of
special kinds of splitting families.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 21:09:12 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Mar 2008 16:22:26 GMT"
}
] | 2010-01-05T00:00:00 | [
[
"Milovich",
"David",
""
]
] |
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