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802.1203 | X. Hernandez | L. Carigi and X. Hernandez | Chemical consequences of low star formation rates: stochastically
sampling the IMF | 13 pages, 13 figures, Accepted for publication in MNRAS | (2009) MNRAS, 390, 582 | 10.1111/j.1365-2966.2008.13743.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When estimating the abundances which result from a given star formation
event, it is customary to treat the IMF as a series of weight factors to be
applied to the stellar yields, as a function of mass, implicitly assuming one
is dealing with an infinite population. However, when the stellar population is
small, the standard procedure would imply the inclusion of fractional numbers
of stars at certain masses. We study the effects of small number statistics on
the resulting abundances by performing an statistical sampling of the IMF to
form a stellar population out of discrete numbers of stars. A chemical
evolution code then follows the evolution of the population, and traces the
resulting abundances. The process is repeated to obtain an statistical
distribution of the resulting abundances and their evolution. We explore the
manner in which different elements are affected, and how different abundances
converge to the infinite population limit as the total mass increases. We
include a discussion of our results in the context of dwarf spheroidal galaxies
and show the recently reported internal dispersions in abundance ratios for
dSph galaxies might be partly explained through the stochastic effects
introduced by a low star formation rate, which can account for dispersions of
over 2 dex in [C/O], [N/O], [C/Fe], [N/Fe] and [O/Fe].
| [
{
"version": "v1",
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},
{
"version": "v2",
"created": "Mon, 28 Jul 2008 16:00:42 GMT"
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] | 2010-01-25T00:00:00 | [
[
"Carigi",
"L.",
""
],
[
"Hernandez",
"X.",
""
]
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802.1204 | Raghvendra Sahai | Raghvendra Sahai, Mark Claussen, Carmen S\'anchez Contreras, Mark
Morris, and Geetanjali Sarkar | High-Velocity Interstellar Bullets in IRAS05506+2414: A Very Young
Protostar | 33 pages, 11 figures Accepted by The Astrophysical Journal (Feb 7,
2008) | null | 10.1086/587638 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have made a serendipitous discovery of an enigmatic outflow source, IRAS
05506+2414 (hereafter IRAS 05506), as part of a multi-wavelength survey of
pre-planetary nebulae (PPNs). The HST optical and near-infrared images show a
bright compact central source with a jet-like extension, and a fan-like spray
of high-velocity (with radial velocities upto 350 kms/s) elongated knots which
appear to emanate from it. These structures are possibly analogous to the
near-IR "bullets" seen in the Orion nebula. Interferometric observations at 2.6
mm show the presence of a high-velocity CO outflow and a continuum source also
with a faint extension, both of which are aligned with the optical jet
structure. IRAS 05506 is most likely not a PPN. We find extended NH3 (1,1)
emission towards IRAS 05506; these data together with the combined presence of
far-IR emission, H2O and OH masers, and CO and CS J=2-1 emission, strongly
argue for a dense, dusty star-forming core associated with IRAS 05506. IRAS
05506 is probably an intermediate-mass or massive protostar, and the very short
time-scale (200 yr) of its outflows indicates that it is very young. If IRAS
05506 is a massive star, then the lack of radio continuum and the late G --
early K spectral type we find from our optical spectra implies that in this
object we are witnessing the earliest stages of its life, while its temperature
is still too low to provide sufficient UV flux for ionisation.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 19:33:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sahai",
"Raghvendra",
""
],
[
"Claussen",
"Mark",
""
],
[
"Contreras",
"Carmen Sánchez",
""
],
[
"Morris",
"Mark",
""
],
[
"Sarkar",
"Geetanjali",
""
]
] | [
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802.1205 | Bakir Farhi | Bruno Deschamps and Bakir Farhi | Essentialit\'e dans les bases additives | 24 pages (in french) | J. Number Theory, 123 (2007), p. 170-192 | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we study the notion of essential subset of an additive basis,
that is to say the minimal finite subsets $P$ of a basis $A$ such that $A
\setminus P$ doesn't remains a basis. The existence of an essential subset for
a basis is equivalent for this basis to be included, for almost all elements,
in an arithmetic non-trivial progression. We show that for every basis $A$
there exists an arithmetic progression with a biggest common difference
containing $A$. Having this common difference $a$ we are able to give an upper
bound to the number of essential subsets of $A$: this is the radical's length
of $a$ (in particular there is always many finite essential subsets in a
basis).
In the case of essential subsets of cardinality 1 (essential elements) we
introduce a way to "dessentialize" a basis. As an application, we definitively
improve the earlier result of Deschamps and Grekos giving an upper bound of the
number of the essential elements of a basis. More precisely, we show that for
all basis $A$ of order $h$, the number $s$ of essential elements of $A$ satisfy
$s\leq c\sqrt{\frac{h}{\log h}}$ where $c=30\sqrt{\frac{\log 1564}{1564}}\simeq
2,05728$, and we show that this inequality is best possible.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 20:13:48 GMT"
}
] | 2008-02-11T00:00:00 | [
[
"Deschamps",
"Bruno",
""
],
[
"Farhi",
"Bakir",
""
]
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] |
802.1206 | Vahid Sandoghdar | P. Kukura, M. Celebrano, A. Renn, V. Sandoghdar | Extinction imaging of a single quantum emitter in its bright and dark
states | null | null | null | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Room temperature detection of single quantum emitters has had a broad impact
in fields ranging from biophysics to material science, photophysics, or even
quantum optics. These experiments have exclusively relied on the efficient
detection of fluorescence. An attractive alternative would be to employ direct
absorption, or more correctly expressed "extinction" measurements. Indeed,
small nanoparticles have been successfully detected using this scheme in
reflection and transmission. Coherent extinction detection of single emitters
has also been reported at cryogenic temperatures, but their room temperature
implementation has remained a great laboratory challenge owing to the expected
weak signal-to-noise ratio. Here we report the first extinction study of a
single quantum emitter at ambient condition. We obtain a direct measure for the
extinction cross section of a single semiconductor nanocrystal both during and
in the absence of fluorescence, for example in the photobleached state or
during blinking off-times. Our measurements pave the way for the detection and
absorption spectroscopy of single molecules or clusters of atoms even in the
quenched state.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 20:19:19 GMT"
}
] | 2008-02-11T00:00:00 | [
[
"Kukura",
"P.",
""
],
[
"Celebrano",
"M.",
""
],
[
"Renn",
"A.",
""
],
[
"Sandoghdar",
"V.",
""
]
] | [
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] |
802.1207 | Andrew J. Landahl | Bradley A. Chase and Andrew J. Landahl | Universal quantum walks and adiabatic algorithms by 1D Hamiltonians | 14 pages | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a family of time-independent nearest-neighbor Hamiltonians
coupling eight-state systems on a 1D ring that enables universal quantum
computation. Hamiltonians in this family can achieve universality either by
driving a continuous-time quantum walk or by terminating an adiabatic
algorithm. In either case, the universality property can be understood as
arising from an efficient simulation of a programmable quantum circuit. Using
gadget perturbation theory, one can demonstrate the same kind of universality
for related Hamiltonian families acting on qubits in 2D. Our results
demonstrate that simulating 1D chains of spin-7/2 particles is BQP-hard, and
indeed BQP-complete because the outputs of decision problems can be encoded in
the outputs of such simulations.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 20:19:57 GMT"
}
] | 2008-02-11T00:00:00 | [
[
"Chase",
"Bradley A.",
""
],
[
"Landahl",
"Andrew J.",
""
]
] | [
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] |
802.1208 | Nicholas Setzer | R. N. Mohapatra, N. Setzer, S. Spinner | Seesaw Extended MSSM and Anomaly Mediation without Tachyonic Sleptons | 40 pages, 10 figures, 5 tables; v3: Added addendum and three new
references; v4: Added reference that was inadvertently omitted | JHEP0804:091,2008 | 10.1088/1126-6708/2008/04/091 | UMD-PP-08-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superconformal anomalies provide an elegant and economical way to understand
the soft breaking parameters in SUSY models; however, implementing them leads
to the several undesirable features including: tachyonic sleptons and
electroweak symmetry breaking problems in both the MSSM and the NMSSM. Since
these two theories also have the additonal problem of massless neutrinos, we
have reconsidered the AMSB problems in a class of models that extends the NMSSM
to explain small neutrino masses via the seesaw mechanism. In a recent paper,
we showed that for a class of minimal left-right extensions, a built-in
mechanism exists which naturally solves the tachyonic slepton problem and
provides new alternatives to the MSSM that also have automatic R-parity
conservation. In this paper, we discuss how electroweak symmetry breaking
arises in this model through an NMSSM-like low energy theory with a singlet
VEV, induced by the structure of the left-right extension and of the right
magnitude. We then study the phenomenological issues and find: the LSP is an
Higgsino-wino mix, new phenomenology for chargino decays to the LSP, degenerate
same generation sleptons and a potential for a mild squark-slepton degeneracy.
We also discuss possible collider signatures and the feasibility of dark matter
in this model.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 20:48:49 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 00:30:02 GMT"
},
{
"version": "v3",
"created": "Mon, 17 Nov 2008 05:14:18 GMT"
},
{
"version": "v4",
"created": "Wed, 10 Dec 2008 02:10:40 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Mohapatra",
"R. N.",
""
],
[
"Setzer",
"N.",
""
],
[
"Spinner",
"S.",
""
]
] | [
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] |
802.1209 | Hanqing Zheng | Hanqing Zheng | Low Lying Scalar Resonances and Chiral Symmetry | Invited plenary talk given at CHIRAL 2007, Nov. 13-16, 2007, RCNP,
Osaka, Japan | Mod.Phys.Lett.A23:2218-2225,2008 | 10.1142/S021773230802906X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current theoretical studies on the $\sigma$ and $\kappa$ resonances are
reviewed. It is emphasized that all evidences accumulated so far are consistent
with the picture that the $\sigma$ meson is the chiral partner of the
Nambu--Goldstone bosons in a linear realization of chiral symmetry.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 20:52:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zheng",
"Hanqing",
""
]
] | [
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] |
802.121 | Christopher Morgan | Christopher W. Morgan (1 and 2), Christopher S. Kochanek (2 and 3),
Xinyu Dai (2 and 3), Nicholas D. Morgan (2) and Emilio E. Falco (4) ((1)
Department of Physics, U.S. Naval Academy, (2) Department of Astronomy, The
Ohio State University, (3) Center for Cosmology and AstroParticle Physics,
The Ohio State University, (4) Harvard-Smithsonian Center for Astrophysics) | X-Ray and Optical Microlensing in the Lensed Quasar PG 1115+080 | 21 pages, 5 figures, submitted to ApJ; corrected errors with the
measurement of the A1/A2 flux ratio | null | 10.1086/592767 | null | astro-ph | null | We analyzed the microlensing of the X-ray and optical emission of the lensed
quasar PG 1115+080. We find that the effective radius of the X-ray emission is
1.3(+1.1 -0.5) dex smaller than that of the optical emission. Viewed as a thin
disk observed at inclination angle i, the optical accretion disk has a scale
length, defined by the point where the disk temperature matches the rest frame
energy of the monitoring band (kT=hc/lambda_rest with lambda_rest=0.3 micron),
of log[(r_{s,opt}/cm)(cos(i) / 0.5)^{1/2}] = 16.6 \pm 0.4. The X-ray emission
region (1.4-21.8 keV in the rest frame) has an effective half-light radius of
log[r_{1/2,X}/cm] = 15.6 (+0.6-0.9}. Given an estimated black hole mass of 1.2
* 10^9 M_sun, corresponding to a gravitational radius of log[r_g/cm] = 14.3,
the X-ray emission is generated near the inner edge of the disk while the
optical emission comes from scales slightly larger than those expected for an
Eddington-limited thin disk. We find a weak trend supporting models with low
stellar mass fractions near the lensed images, in mild contradiction to
inferences from the stellar velocity dispersion and the time delays.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 21:00:20 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 20:13:13 GMT"
},
{
"version": "v3",
"created": "Wed, 30 Apr 2008 15:29:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Morgan",
"Christopher W.",
"",
"1 and 2"
],
[
"Kochanek",
"Christopher S.",
"",
"2 and 3"
],
[
"Dai",
"Xinyu",
"",
"2 and 3"
],
[
"Morgan",
"Nicholas D.",
""
],
[
"Falco",
"Emilio E.",
""
]
] | [
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] |
802.1211 | Jens Eisert | R. H\"ubener, C. Kruszynska, L. Hartmann, and W. D\"ur, F. Verstraete,
J. Eisert, M.B. Plenio | Renormalization algorithm with graph enhancement | 4 pages, 1 figure | Phys. Rev. A 79, 022317 (2009) | 10.1103/PhysRevA.79.022317 | null | quant-ph cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a class of variational states to describe quantum many-body
systems. This class generalizes matrix product states which underly the
density-matrix renormalization group approach by combining them with weighted
graph states. States within this class may (i) possess arbitrarily long-ranged
two-point correlations, (ii) exhibit an arbitrary degree of block entanglement
entropy up to a volume law, (iii) may be taken translationally invariant, while
at the same time (iv) local properties and two-point correlations can be
computed efficiently. This new variational class of states can be thought of as
being prepared from matrix product states, followed by commuting unitaries on
arbitrary constituents, hence truly generalizing both matrix product and
weighted graph states. We use this class of states to formulate a
renormalization algorithm with graph enhancement (RAGE) and present numerical
examples demonstrating that improvements over density-matrix renormalization
group simulations can be achieved in the simulation of ground states and
quantum algorithms. Further generalizations, e.g., to higher spatial
dimensions, are outlined.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 21:02:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hübener",
"R.",
""
],
[
"Kruszynska",
"C.",
""
],
[
"Hartmann",
"L.",
""
],
[
"Dür",
"W.",
""
],
[
"Verstraete",
"F.",
""
],
[
"Eisert",
"J.",
""
],
[
"Plenio",
"M. B.",
""
]
] | [
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] |
802.1212 | Vladimir Cvetkovic | V. Cvetkovic, Z. Tesanovic | Rough edges in quantum transport of Dirac particles | 5 pages, 2 figures, presentation unified and streamlined using
4-component spinors, additional references | null | null | null | cond-mat.str-el cond-mat.mes-hall | null | We consider Dirac particles confined to a thin strip, e.g., graphene
nanoribbon, with rough edges. The confinement is implemented by a large mass in
the Hamiltonian or by imposing boundary conditions directly on the graphene
wave-functions. The scattering of a rough edge leads to a transverse
channel-mixing and provides crucial limitation to the quantum transport in
narrow ribbons. We solve the problem perturbatively and find the edge
scattering contribution to the conductivity, which can be measured
experimentally. The case of Schroedinger particles in a strip is also
addressed, and the comparison between Schroedinger and Dirac transport is made.
Anomalies associated with quasi-one dimensionality, such as Van Hove
singularities and localization, are discussed. The violation of the Matthiessen
rule is pointed out.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:10:46 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Feb 2008 20:11:46 GMT"
}
] | 2008-02-27T00:00:00 | [
[
"Cvetkovic",
"V.",
""
],
[
"Tesanovic",
"Z.",
""
]
] | [
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0.0317371488,
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] |
802.1213 | Fredrik Fatemi | Spencer E. Olson, Matthew L. Terraciano, Mark Bashkansky, Fredrik K.
Fatemi | Cold atom confinement in an all-optical dark ring trap | 5 pages, 4 figures | Phys. Rev. A 76, 061404(R) (2007) | 10.1103/PhysRevA.76.061404 | null | quant-ph | http://creativecommons.org/licenses/publicdomain/ | We demonstrate confinement of $^{85}$Rb atoms in a dark, toroidal optical
trap. We use a spatial light modulator to convert a single blue-detuned
Gaussian laser beam to a superposition of Laguerre-Gaussian modes that forms a
ring-shaped intensity null bounded harmonically in all directions. We measure a
1/e spin-relaxation lifetime of ~1.5 seconds for a trap detuning of 4.0 nm. For
smaller detunings, a time-dependent relaxation rate is observed. We use these
relaxation rate measurements and imaging diagnostics to optimize trap alignment
in a programmable manner with the modulator. The results are compared with
numerical simulations.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 21:03:14 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Olson",
"Spencer E.",
""
],
[
"Terraciano",
"Matthew L.",
""
],
[
"Bashkansky",
"Mark",
""
],
[
"Fatemi",
"Fredrik K.",
""
]
] | [
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] |
802.1214 | S. L. Bridle | Sarah Bridle, John Shawe-Taylor, Adam Amara, Douglas Applegate,
Sreekumar T. Balan, Joel Berge, Gary Bernstein, Hakon Dahle, Thomas Erben,
Mandeep Gill, Alan Heavens, Catherine Heymans, F. William High, Henk
Hoekstra, Mike Jarvis, Donnacha Kirk, Thomas Kitching, Jean-Paul Kneib,
Konrad Kuijken, David Lagatutta, Rachel Mandelbaum, Richard Massey, Yannick
Mellier, Baback Moghaddam, Yassir Moudden, Reiko Nakajima, Stephane
Paulin-Henriksson, Sandrine Pires, Anais Rassat, Alexandre Refregier, Jason
Rhodes, Tim Schrabback, Elisabetta Semboloni, Marina Shmakova, Ludovic van
Waerbeke, Dugan Witherick, Lisa Voigt, David Wittman | Handbook for the GREAT08 Challenge: An image analysis competition for
cosmological lensing | Published in at http://dx.doi.org/10.1214/08-AOAS222 the Annals of
Applied Statistics (http://www.imstat.org/aoas/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Statistics 2009, Vol. 3, No. 1, 6-37 | 10.1214/08-AOAS222 | IMS-AOAS-AOAS222 | astro-ph stat.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The GRavitational lEnsing Accuracy Testing 2008 (GREAT08) Challenge focuses
on a problem that is of crucial importance for future observations in
cosmology. The shapes of distant galaxies can be used to determine the
properties of dark energy and the nature of gravity, because light from those
galaxies is bent by gravity from the intervening dark matter. The observed
galaxy images appear distorted, although only slightly, and their shapes must
be precisely disentangled from the effects of pixelisation, convolution and
noise. The worldwide gravitational lensing community has made significant
progress in techniques to measure these distortions via the Shear TEsting
Program (STEP). Via STEP, we have run challenges within our own community, and
come to recognise that this particular image analysis problem is ideally
matched to experts in statistical inference, inverse problems and computational
learning. Thus, in order to continue the progress seen in recent years, we are
seeking an infusion of new ideas from these communities. This document details
the GREAT08 Challenge for potential participants. Please visit
http://www.great08challenge.info for the latest information.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:57:56 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Aug 2008 22:22:17 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Jun 2009 13:04:42 GMT"
}
] | 2009-06-15T00:00:00 | [
[
"Bridle",
"Sarah",
""
],
[
"Shawe-Taylor",
"John",
""
],
[
"Amara",
"Adam",
""
],
[
"Applegate",
"Douglas",
""
],
[
"Balan",
"Sreekumar T.",
""
],
[
"Berge",
"Joel",
""
],
[
"Bernstein",
"Gary",
""
],
[
"Dahle",
"Hakon",
""
],
[
"Erben",
"Thomas",
""
],
[
"Gill",
"Mandeep",
""
],
[
"Heavens",
"Alan",
""
],
[
"Heymans",
"Catherine",
""
],
[
"High",
"F. William",
""
],
[
"Hoekstra",
"Henk",
""
],
[
"Jarvis",
"Mike",
""
],
[
"Kirk",
"Donnacha",
""
],
[
"Kitching",
"Thomas",
""
],
[
"Kneib",
"Jean-Paul",
""
],
[
"Kuijken",
"Konrad",
""
],
[
"Lagatutta",
"David",
""
],
[
"Mandelbaum",
"Rachel",
""
],
[
"Massey",
"Richard",
""
],
[
"Mellier",
"Yannick",
""
],
[
"Moghaddam",
"Baback",
""
],
[
"Moudden",
"Yassir",
""
],
[
"Nakajima",
"Reiko",
""
],
[
"Paulin-Henriksson",
"Stephane",
""
],
[
"Pires",
"Sandrine",
""
],
[
"Rassat",
"Anais",
""
],
[
"Refregier",
"Alexandre",
""
],
[
"Rhodes",
"Jason",
""
],
[
"Schrabback",
"Tim",
""
],
[
"Semboloni",
"Elisabetta",
""
],
[
"Shmakova",
"Marina",
""
],
[
"van Waerbeke",
"Ludovic",
""
],
[
"Witherick",
"Dugan",
""
],
[
"Voigt",
"Lisa",
""
],
[
"Wittman",
"David",
""
]
] | [
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] |
802.1215 | Carlo R. Contaldi | Carlo R. Contaldi, Toby Wiseman, Benjamin Withers | TeVeS gets caught on caustics | 23 pages,12 figures, matches published version | Phys.Rev.D78:044034,2008 | 10.1103/PhysRevD.78.044034 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | TeVeS uses a dynamical vector field with timelike unit norm constraint to
specify a preferred local frame. When matter moves slowly in this frame - the
so-called quasi-static regime - Modified Newtonian Dynamics (MoND) results.
Theories with such vectors (such as Einstein-aether) are prone to the vector
dynamics forming singularities which render their classical evolution
problematic. Here we analyse the dynamics of the vector in TeVeS in various
situations. We find that, quite generically, the vector field develops caustic
singularities on time scales of order the gravitational in-fall time. Having
shown singularity formation is generic with or without matter, Bekenstein's
original formulation of TeVeS appears dynamically problematic. We argue that by
modifying the vector field kinetic terms to the more general form used by
Einstein-Aether this problem may be avoided.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 18:25:51 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 18:38:27 GMT"
},
{
"version": "v3",
"created": "Mon, 27 Oct 2008 17:06:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Contaldi",
"Carlo R.",
""
],
[
"Wiseman",
"Toby",
""
],
[
"Withers",
"Benjamin",
""
]
] | [
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] |
802.1216 | Sudip Chakravarty | Sudip Chakravarty | High temperature superconductivity: from complexity to simplicity | An edited shorter version is published in Science | Science, 319, 735 (2008) | 10.1126/science.1154320 | null | cond-mat.supr-con | http://creativecommons.org/licenses/by/3.0/ | I discuss the recent quantum oscillation experiments in the underdoped high
temperature superconductors.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 21:16:01 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Chakravarty",
"Sudip",
""
]
] | [
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] |
802.1217 | Luis Dieulefait | Nicolas Billerey, Luis Dieulefait | Solving Fermat-type equations x^5+y^5=dz^p | major revision: mistakes corrected, several new cases covered | null | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we are interested in solving the Fermat-type equations
x^5+y^5=dz^p where d is a positive integer and p a prime number $\ge 7$. We
describe a new method based on modularity theorems which allows us to improve
all the results in a previous paper of the first author. We finally discuss the
present limitations of the method by looking at the case d=3.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 21:18:41 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jun 2008 17:40:02 GMT"
}
] | 2008-06-11T00:00:00 | [
[
"Billerey",
"Nicolas",
""
],
[
"Dieulefait",
"Luis",
""
]
] | [
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802.1218 | Santo Fortunato Dr | Andrea Lancichinetti, Santo Fortunato, Janos Kertesz | Detecting the overlapping and hierarchical community structure of
complex networks | 20 pages, 8 figures. Final version published on New Journal of
Physics | New Journal of Physics 11, 033015 (2009) | 10.1088/1367-2630/11/3/033015 | null | physics.soc-ph cond-mat.stat-mech physics.comp-ph stat.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many networks in nature, society and technology are characterized by a
mesoscopic level of organization, with groups of nodes forming tightly
connected units, called communities or modules, that are only weakly linked to
each other. Uncovering this community structure is one of the most important
problems in the field of complex networks. Networks often show a hierarchical
organization, with communities embedded within other communities; moreover,
nodes can be shared between different communities. Here we present the first
algorithm that finds both overlapping communities and the hierarchical
structure. The method is based on the local optimization of a fitness function.
Community structure is revealed by peaks in the fitness histogram. The
resolution can be tuned by a parameter enabling to investigate different
hierarchical levels of organization. Tests on real and artificial networks give
excellent results.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 21:30:51 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Mar 2009 09:53:44 GMT"
}
] | 2009-03-11T00:00:00 | [
[
"Lancichinetti",
"Andrea",
""
],
[
"Fortunato",
"Santo",
""
],
[
"Kertesz",
"Janos",
""
]
] | [
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802.1219 | Licia Verde | Licia Verde (ICE-Barcelona/Princeton), Hiranya V. Peiris (Cambridge/U.
Chicago) | On Minimally-Parametric Primordial Power Spectrum Reconstruction and the
Evidence for a Red Tilt | 18 pages, 8 figures, JCAP. Minor changes to match published version | JCAP 0807:009,2008 | 10.1088/1475-7516/2008/07/009 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The latest cosmological data seem to indicate a significant deviation from
scale invariance of the primordial power spectrum when parameterized either by
a power law or by a spectral index with non-zero "running". This deviation, by
itself, serves as a powerful tool to discriminate among theories for the origin
of cosmological structures such as inflationary models. Here, we use a
minimally-parametric smoothing spline technique to reconstruct the shape of the
primordial power spectrum. This technique is well-suited to search for smooth
features in the primordial power spectrum such as deviations from scale
invariance or a running spectral index, although it would recover sharp
features of high statistical significance. We use the WMAP 3 year results in
combination with data from a suite of higher resolution CMB experiments
(including the latest ACBAR 2008 release), as well as large-scale structure
data from SDSS and 2dFGRS. We employ cross-validation to assess, using the data
themselves, the optimal amount of smoothness in the primordial power spectrum
consistent with the data. This minimally-parametric reconstruction supports the
evidence for a power law primordial power spectrum with a red tilt, but not for
deviations from a power law power spectrum. Smooth variations in the primordial
power spectrum are not significantly degenerate with the other cosmological
parameters.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 12:20:27 GMT"
},
{
"version": "v2",
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] | 2011-05-12T00:00:00 | [
[
"Verde",
"Licia",
"",
"ICE-Barcelona/Princeton"
],
[
"Peiris",
"Hiranya V.",
"",
"Cambridge/U.\n Chicago"
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802.122 | Cheng Qi | Qi Cheng and Daqing Wan | Complexity of Decoding Positive-Rate Reed-Solomon Codes | null | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The complexity of maximal likelihood decoding of the Reed-Solomon codes
$[q-1, k]_q$ is a well known open problem. The only known result in this
direction states that it is at least as hard as the discrete logarithm in some
cases where the information rate unfortunately goes to zero. In this paper, we
remove the rate restriction and prove that the same complexity result holds for
any positive information rate. In particular, this resolves an open problem
left in [4], and rules out the possibility of a polynomial time algorithm for
maximal likelihood decoding problem of Reed-Solomon codes of any rate under a
well known cryptographical hardness assumption. As a side result, we give an
explicit construction of Hamming balls of radius bounded away from the minimum
distance, which contain exponentially many codewords for Reed-Solomon code of
any positive rate less than one. The previous constructions only apply to
Reed-Solomon codes of diminishing rates. We also give an explicit construction
of Hamming balls of relative radius less than 1 which contain subexponentially
many codewords for Reed-Solomon code of rate approaching one.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 21:45:21 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Cheng",
"Qi",
""
],
[
"Wan",
"Daqing",
""
]
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802.1221 | Sergei Alexandrov | Sergei Alexandrov | Immirzi parameter and fermions with non-minimal coupling | 4 pages | Class.Quant.Grav.25:145012,2008 | 10.1088/0264-9381/25/14/145012 | PTA/08-003 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We clarify the role played by the Immirzi parameter in classical gravity
coupled to fermions. Considering the general non-minimal coupling, we show
that, although the torsion depends explicitly on the Immirzi parameter, in a
suitable parametrization the effective action obtained by integrating out the
spin-connection is independent of it. Thus the Immirzi parameter is not
detectable in classical theory even after coupling of fermions.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 21:47:49 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jun 2008 13:43:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Alexandrov",
"Sergei",
""
]
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] |
802.1222 | Henni Ouerdane | Henni Ouerdane and Michael J. Jamieson | S-wave and p-wave scattering in a cold gas of Na and Rb atoms | The article contains additional material and data (see abstract) | Eur. Phys. J. D 53, 27-32 (2009) | 10.1140/epjd/e2009-00042-8 | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using improved experimentally based $X{}^1\Sigma^+$ and $a{}^3\Sigma^+$
molecular potentials of NaRb, we apply the variable phase method to compute new
data for low energy scattering of $^{23}$Na atoms by $^{85}$Rb atoms and
$^{87}$Rb atoms. These are the scattering lengths and volumes, numbers of bound
states and effective ranges, which we use to obtain the low energy spin-change
cross section as functions of the system temperature and the isotope masses.
From an analysis of the contributions of s-wave and p-wave scatterings to the
elastic cross section we estimate temperatures below which only s-wave
scattering is dominant. We compare our quantal results to data obtained from
the semiclassical approximation. We supply evidence for the existence of a near
zero energy p-wave bound state supported by the singlet molecular potential.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:36:41 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Jan 2009 22:21:13 GMT"
}
] | 2009-05-11T00:00:00 | [
[
"Ouerdane",
"Henni",
""
],
[
"Jamieson",
"Michael J.",
""
]
] | [
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802.1223 | Michael E. Wall | David W. Dreisigmeyer, Jelena Stajic, Ilya Nemenman, William S.
Hlavacek, Michael E. Wall | Determinants of bistability in induction of the Escherichia coli lac
operon | 19 pages, 10 figures, First q-bio Conference on Cellular Information
Processing | null | null | LA-UR-08-0753 | q-bio.CB q-bio.MN | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have developed a mathematical model of regulation of expression of the
Escherichia coli lac operon, and have investigated bistability in its
steady-state induction behavior in the absence of external glucose. Numerical
analysis of equations describing regulation by artificial inducers revealed two
natural bistability parameters that can be used to control the range of inducer
concentrations over which the model exhibits bistability. By tuning these
bistability parameters, we found a family of biophysically reasonable systems
that are consistent with an experimentally determined bistable region for
induction by thio-methylgalactoside (Ozbudak et al. Nature 427:737, 2004). The
model predicts that bistability can be abolished when passive transport or
permease export becomes sufficiently large; the former case is especially
relevant to induction by isopropyl-beta, D-thiogalactopyranoside. To model
regulation by lactose, we developed similar equations in which allolactose, a
metabolic intermediate in lactose metabolism and a natural inducer of lac, is
the inducer. For biophysically reasonable parameter values, these equations
yield no bistability in response to induction by lactose; however, systems with
an unphysically small permease-dependent export effect can exhibit small
amounts of bistability for limited ranges of parameter values. These results
cast doubt on the relevance of bistability in the lac operon within the natural
context of E. coli, and help shed light on the controversy among existing
theoretical studies that address this issue. The results also suggest an
experimental approach to address the relevance of bistability in the lac operon
within the natural context of E. coli.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 22:21:49 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Dreisigmeyer",
"David W.",
""
],
[
"Stajic",
"Jelena",
""
],
[
"Nemenman",
"Ilya",
""
],
[
"Hlavacek",
"William S.",
""
],
[
"Wall",
"Michael E.",
""
]
] | [
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802.1224 | Sougato Bose | Sougato Bose | Quantum Communication through Spin Chain Dynamics: an Introductory
Overview | Material covered till Dec 2006 | Contemporary Physics, Volume 48, Issue 1 January 2007, pages 13 -
30 | 10.1080/00107510701342313 | null | cond-mat.other cond-mat.stat-mech cond-mat.str-el quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an introductory overview of the use of spin chains as quantum
wires, which has recently developed into a topic of lively interest. The
principal motivation is in connecting quantum registers without resorting to
optics. A spin chain is a permanently coupled 1D system of spins. When one
places a quantum state on one end of it, the state will be dynamically
transmitted to the other end with some efficiency if the spins are coupled by
an exchange interaction. No external modulations or measurements on the body of
the chain, except perhaps at the very ends, is required for this purpose. For
the simplest (uniformly coupled) chain and the simplest encoding (single qubit
encoding), however, dispersion reduces the quality of transfer. We present a
variety of alternatives proposed by various groups to achieve perfect quantum
state transfer through spin chains. We conclude with a brief discussion of the
various directions in which the topic is developing.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 23:05:29 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Bose",
"Sougato",
""
]
] | [
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] |
802.1225 | Anne Ersbak Bang Nielsen | Anne E. B. Nielsen and Klaus Molmer | Stochastic master equation for a probed system in a cavity | 10 pages, 5 figures | Phys. Rev. A 77, 052111 (2008). | 10.1103/PhysRevA.77.052111 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed derivation of the stochastic master equation
determining the time evolution of the state of a general quantum system, which
is placed inside a cavity and subjected to indirect measurements by monitoring
the state of electromagnetic radiation transmitted through the cavity. The
derivation is based on the physics involved and the final result is stated in
terms of the physical parameters of the setup. To illustrate the predictions
contained in the equation, we solve it analytically for a specific system, and
we demonstrate quantum jumps and freezing of the internal coherent dynamics of
the system as a result of continued measurements.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 23:10:37 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Apr 2008 15:22:22 GMT"
}
] | 2008-05-15T00:00:00 | [
[
"Nielsen",
"Anne E. B.",
""
],
[
"Molmer",
"Klaus",
""
]
] | [
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] |
802.1226 | Qiqi Yan | Qiqi Yan | Lower Bounds for Complementation of omega-Automata Via the Full Automata
Technique | null | Logical Methods in Computer Science, Volume 4, Issue 1 (March 19,
2008) lmcs:992 | 10.2168/LMCS-4(1:5)2008 | null | cs.LO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we first introduce a lower bound technique for the state
complexity of transformations of automata. Namely we suggest first considering
the class of full automata in lower bound analysis, and later reducing the size
of the large alphabet via alphabet substitutions. Then we apply such technique
to the complementation of nondeterministic \omega-automata, and obtain several
lower bound results. Particularly, we prove an \omega((0.76n)^n) lower bound
for B\"uchi complementation, which also holds for almost every complementation
or determinization transformation of nondeterministic omega-automata, and prove
an optimal (\omega(nk))^n lower bound for the complementation of generalized
B\"uchi automata, which holds for Streett automata as well.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 23:13:52 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 15:05:48 GMT"
},
{
"version": "v3",
"created": "Wed, 22 Oct 2008 21:01:52 GMT"
}
] | 2015-07-01T00:00:00 | [
[
"Yan",
"Qiqi",
""
]
] | [
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802.1227 | Maria Vallarino | Stefano Meda, Maria Vallarino | Weak type estimates for spherical multipliers on noncompact symmetric
spaces | null | null | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we prove sharp weak type 1 estimates for spherical Fourier
multipliers on symmetric spaces of the noncompact type. This complements
earlier results of J.-Ph. Anker and A.D. Ionescu.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:28:43 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Meda",
"Stefano",
""
],
[
"Vallarino",
"Maria",
""
]
] | [
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] |
802.1228 | Gaku Kawashima | Gaku Kawashima | A generalization of the duality for multiple harmonic sums | 12 pages; minor corrections; to appear in Journal of Number Theory | null | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The duality is a fundamental property of the finite multiple harmonic sums
(MHS). In this paper, we prove a duality result for certain generalizations of
MHS which appear naturally as the differences of MHS. We also prove a formula
for the differences of these generalized MHS.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:59:55 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Feb 2009 12:20:56 GMT"
},
{
"version": "v3",
"created": "Tue, 12 May 2009 08:03:23 GMT"
}
] | 2009-05-12T00:00:00 | [
[
"Kawashima",
"Gaku",
""
]
] | [
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802.1229 | Riccardo Adami | Riccardo Adami, Laszlo Erdos | Rate of decoherence for an electron weakly coupled to a phonon gas | 27 pages, 2 figures | null | 10.1007/s10955-008-9561-8 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of an electron weakly coupled to a phonon gas. The
initial state of the electron is the superposition of two spatially localized
distant bumps moving towards each other, and the phonons are in a thermal
state. We investigate the dynamics of the system in the kinetic regime and show
that the time evolution makes the non-diagonal terms of the density matrix of
the electron decay, destroying the interference between the two bumps. We show
that such a damping effect is exponential in time, and the related decay rate
is proportional to the total scattering cross section of the electron-phonon
interaction.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 23:42:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Adami",
"Riccardo",
""
],
[
"Erdos",
"Laszlo",
""
]
] | [
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] |
802.123 | Magdalena Djordjevic | Magdalena Djordjevic and Ulrich W. Heinz | Radiative energy loss in a finite dynamical QCD medium | 4 pages, 3 figures | Phys.Rev.Lett.101:022302,2008 | 10.1103/PhysRevLett.101.022302 | CERN-PH-TH/2008-018 | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The radiative energy loss of a quark jet traversing a finite size QCD medium
with dynamical constituents is calculated to first order in opacity. Although
finite size corrections reduce the energy loss relative to an infinite
dynamical QCD medium, under realistic conditions it remains significantly
larger than in a static medium. Quantitative predictions of jet suppression in
relativistic heavy ion collisions must therefore account for the dynamics of
the medium's constituents. Finite size effects are shown to induce a non-linear
path length dependence of the energy loss. Our results suggest a simple general
mapping between energy loss expressions for static and dynamical QCD media.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 23:42:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Djordjevic",
"Magdalena",
""
],
[
"Heinz",
"Ulrich W.",
""
]
] | [
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] |
802.1231 | Anh Vinh Le | Si Li, Le Anh Vinh | On the spectrum of unitary finite-Euclidean graphs | null | null | null | null | math.CO math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider unitary graphs attached to Z_d^n using an analogue of the
Euclidean distance. These graphs are shown to be integral when n is odd or the
dimension d is even.
| [
{
"version": "v1",
"created": "Fri, 8 Feb 2008 23:59:55 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jul 2008 04:14:52 GMT"
}
] | 2008-07-17T00:00:00 | [
[
"Li",
"Si",
""
],
[
"Vinh",
"Le Anh",
""
]
] | [
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] |
802.1232 | Mithat Unsal | Mikhail Shifman, Mithat Unsal | QCD-like Theories on R_3\times S_1: a Smooth Journey from Small to Large
r(S_1) with Double-Trace Deformations | 49 pages, 2 figures | Phys.Rev.D78:065004,2008 | 10.1103/PhysRevD.78.065004 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider QCD-like theories with one massless fermion in various
representations of the gauge group SU$(N)$. The theories are formulated on
$R_3\times S_1$. In the decompactification limit of large $r(S_1)$ all these
theories are characterized by confinement, mass gap and spontaneous breaking of
a (discrete) chiral symmetry ($\chi$SB). At small $r(S_1)$, in order to
stabilize the vacua of these theories at a center-symmetric point, we suggest
to perform a double trace deformation. With these deformation, the theories at
hand are at weak coupling at small $r(S_1)$ and yet exhibit basic features of
the large-$r(S_1)$ limit: confinement and $\chi$SB. We calculate the string
tension, mass gap, bifermion condensates and $\theta$ dependence. The
double-trace deformation becomes dynamically irrelevant at large $r(S_1)$.
Despite the fact that at small $r(S_1)$ confinement is Abelian, while it is
expected to be non-Abelian at large $r(S_1)$, we argue that small and
large-$r(S_1)$ physics are continuously connected. If so, one can use
small-$r(S_1)$ laboratory to extract lessons about QCD and QCD-like theories on
$R_4$.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 00:06:43 GMT"
}
] | 2010-05-27T00:00:00 | [
[
"Shifman",
"Mikhail",
""
],
[
"Unsal",
"Mithat",
""
]
] | [
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] |
802.1233 | Jiawang Nie | Jiawang Nie and Kristian Ranestad | Algebraic Degree of Polynomial Optimization | 13 pages | null | null | null | math.OC math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Consider the polynomial optimization problem whose objective and constraints
are all described by multivariate polynomials. Under some genericity
assumptions, %% on these polynomials, we prove that the optimality conditions
always hold on optimizers, and the coordinates of optimizers are algebraic
functions of the coefficients of the input polynomials. We also give a general
formula for the algebraic degree of the optimal coordinates. The derivation of
the algebraic degree is equivalent to counting the number of all complex
critical points. As special cases, we obtain the algebraic degrees of
quadratically constrained quadratic programming (QCQP), second order cone
programming (SOCP) and $p$-th order cone programming (pOCP), in analogy to the
algebraic degree of semidefinite programming.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 00:11:30 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Nie",
"Jiawang",
""
],
[
"Ranestad",
"Kristian",
""
]
] | [
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] |
802.1234 | Edward G. Effros | Edward G. Effros | A Matrix Convexity Approach to Some Celebrated Quantum Inequalities | 8 pages | null | 10.1073/pnas.0807965106 | null | math-ph math.MP | null | Some of the important inequalities associated with quantum entropy are
immediate algebraic consequences of the Hansen-Pedersen-Jensen inequality. A
general argument is given using matrix perspectives of operator convex
functions. A matrix analogue of Mar\'{e}chal's extended perspectives provides
additional inequalities, including a $p+q\leq 1$ result of Lieb.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 23:56:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Effros",
"Edward G.",
""
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802.1235 | Alin Panaitescu | A. Panaitescu | Direct and bulk-scattered forward-shock emissions: sources of X-ray
afterglow diversity | 6 pages, submitted to the proceedings of 2007 GRB meeting, Santa Fe,
NM, Nov 5-9 2007 | AIP Conf.Proc.1000:433-438,2008 | 10.1063/1.2943502 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I describe the modifications to the standard forward-shock model required to
account for the X-ray light-curve features discovered by Swift in the early
afterglow emission and propose that a delayed, pair-enriched, and highly
relativistic outflow, which bulk-scatters the forward-shock synchrotron
emission, yields sometimes a brighter X-ray emission, producing short-lived
X-ray flares, X-ray light-curve plateaus ending with chromatic breaks, and fast
post-plateau X-ray decays.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 00:36:48 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Panaitescu",
"A.",
""
]
] | [
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] |
802.1236 | David C. Johnston | X. Zong, S. Das, F. Borsa, M. D. Vannette, R. Prozorov, J. Schmalian,
D. C. Johnston | ^{7}Li NMR Study of Heavy Fermion LiV2O4 Containing Magnetic Defects | 18 pages typeset in 2 columns, 16 figures; submitted to PRB | Phys. Rev. B 77, 144419 (2008); 17 pages | 10.1103/PhysRevB.77.144419 | null | cond-mat.str-el cond-mat.mtrl-sci | null | We present a systematic study of the variations of the ^{7}Li NMR properties
versus magnetic defect concentration up to 0.83 mol% within the spinel
structure of polycrystalline powder samples and a collection of small single
crystals of LiV2O4 in the temperature range from 0.5 to 4.2 K. We also report
static magnetization measurements and ac magnetic susceptibility measurements
at 14 MHz on the samples at low temperatures. Both the NMR spectrum and nuclear
spin-lattice relaxation rate are inhomogeneous in the presence of the magnetic
defects. The NMR data for the powders are well explained by assuming that (i)
there is a random distribution of magnetic point defects, (ii) the same heavy
Fermi liquid is present in the samples containing the magnetic defects as in
magnetically pure LiV2O4, and (iii) the influences of the magnetic defects and
of the Fermi liquid on the magnetization and NMR properties are separable. In
the single crystals, somewhat different behaviors are observed. Remarkably, the
magnetic defects in the powder samples show evidence of spin freezing below T ~
1.0 K, whereas in the single crystals with similar magnetic defect
concentration no spin freezing was found down to 0.5 K. Thus different types of
magnetic defects and/or interactions between them appear to arise in the
powders versus the crystals, possibly due to the substantially different
synthesis conditions of the powders and crystals.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 15:35:00 GMT"
}
] | 2010-11-12T00:00:00 | [
[
"Zong",
"X.",
""
],
[
"Das",
"S.",
""
],
[
"Borsa",
"F.",
""
],
[
"Vannette",
"M. D.",
""
],
[
"Prozorov",
"R.",
""
],
[
"Schmalian",
"J.",
""
],
[
"Johnston",
"D. C.",
""
]
] | [
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802.1237 | Gwena\"el Joret | Jean Cardinal, Samuel Fiorini, and Gwena\"el Joret | Minimum Entropy Orientations | Referees' comments incorporated | Operations Research Letters 36 (2008), pp. 680-683 | 10.1016/j.orl.2008.06.010 | null | cs.DS cs.DM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study graph orientations that minimize the entropy of the in-degree
sequence. The problem of finding such an orientation is an interesting special
case of the minimum entropy set cover problem previously studied by Halperin
and Karp [Theoret. Comput. Sci., 2005] and by the current authors
[Algorithmica, to appear]. We prove that the minimum entropy orientation
problem is NP-hard even if the graph is planar, and that there exists a simple
linear-time algorithm that returns an approximate solution with an additive
error guarantee of 1 bit. This improves on the only previously known algorithm
which has an additive error guarantee of log_2 e bits (approx. 1.4427 bits).
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 01:38:06 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Sep 2008 14:43:52 GMT"
}
] | 2008-10-28T00:00:00 | [
[
"Cardinal",
"Jean",
""
],
[
"Fiorini",
"Samuel",
""
],
[
"Joret",
"Gwenaël",
""
]
] | [
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] |
802.1238 | Jiliang Jing | Qiyuan Pan and Jiliang Jing | Degradation of non-maximal entanglement of scalar and Dirac fields in
non-inertial frames | 9 pages, 4 figures | Phys.Rev.A77:024302,2008 | 10.1103/PhysRevA.77.024302 | null | quant-ph | http://creativecommons.org/licenses/by/3.0/ | The entanglement between two modes of the free scalar and Dirac fields as
seen by two relatively accelerated observers has been investigated. It is found
that the same initial entanglement for an initial state parameter $\alpha$ and
its "normalized partner" $\sqrt{1-\alpha^{2}}$ will be degraded by the Unruh
effect along two different trajectories except for the maximally entangled
state, which just shows the inequivalence of the quantization for a free field
in the Minkowski and Rindler coordinates. In the infinite acceleration limit
the state doesn't have the distillable entanglement for any $\alpha$ for the
scalar field but always remains entangled to a degree which is dependent of
$\alpha$ for the Dirac field. It is also interesting to note that in this limit
the mutual information equals to just half of the initially mutual information,
which is independent of $\alpha$ and the type of field.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 02:06:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pan",
"Qiyuan",
""
],
[
"Jing",
"Jiliang",
""
]
] | [
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802.1239 | Louis Levenson | L.R. Levenson, E.L. Wright (UCLA) | Probing the 3.6 Micron CIRB with Spitzer in 3 DIRBE Dark Spots | 40 pages LaTeX, 19 figures, 5 tables, This is the verson accepted by
the ApJ. Minor changes include replotting Figure 1, 3 and 4 on the same axes
as Fig. 13 and more detailed description of the sample galaxies used for
completeness estimation. References added | Astrophys.J.683:585-596,2008 | 10.1086/589808 | null | astro-ph | null | We observed three regions of the sky with Spitzer in which the Cosmic
InfraRed Background (CIRB) has been determined at 3.5 microns using the method
of subtracting 2MASS stellar fluxes from zodiacal light subtracted DIRBE maps.
For each of these regions we have obtained 270 seconds of integration time per
pixel with IRAC on Spitzer over the central square degree. We present galaxy
counts in each of these approximately 1 square degree IRAC surveys. Along with
deep galaxy counts in the Extended Groth Strip and GOODS North, we are able to
compare the galactic contribution to the CIRB with the "DIRBE minus 2MASS''
determined L-band CIRB. Using the profile-fit photometry package GIM2D, we find
a substantially larger flux contribution to the CIRB than that determined using
aperture photometry. We have also made the first rigorous analysis of the
uncertainties in determining the CIRB via galaxy counts in Spitzer images using
a Monte Carlo Markov Chain simulation of our data analysis. Using a simple
broken power law model for galaxy counts as a function of magnitude we find a
most probable contribution to the CIRB from galaxies at 3.6 microns of
10.8^{+2.1}_{-1.1} kJy/sr. Even with this restricted model, however, we find
that galaxy counting does not strongly constrain the CIRB from above. We are
able to find solutions in which the CIRB runs away to large intensities without
the need for an additional diffuse source.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 02:52:24 GMT"
},
{
"version": "v2",
"created": "Sat, 10 May 2008 00:03:42 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Levenson",
"L. R.",
"",
"UCLA"
],
[
"Wright",
"E. L.",
"",
"UCLA"
]
] | [
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] |
802.124 | Shi-Ge Peng | Laurent Denis, Mingshang Hu and Shige Peng | Function spaces and capacity related to a Sublinear Expectation:
application to G-Brownian Motion Pathes | 26 pages | null | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we give some basic and important properties of several typical
Banach spaces of functions of $G$-Brownian motion pathes induced by a sublinear
expectation--G-expectation. Many results can be also applied to more general
situations. A generalized version of Kolmogorov's criterion for continuous
modification of a stochastic process is also obtained. The results can be
applied to continuous time dynamic and coherent risk measures in finance in
particular for path-dependence risky positions under situations of volatility
model uncertainty.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 02:29:09 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Jan 2010 02:08:42 GMT"
}
] | 2010-01-15T00:00:00 | [
[
"Denis",
"Laurent",
""
],
[
"Hu",
"Mingshang",
""
],
[
"Peng",
"Shige",
""
]
] | [
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] |
802.1241 | Francesco Sorrentino Dr. | Francesco Sorrentino, Edward Ott | Adaptive synchronization of dynamics on evolving complex networks | Accepted for publication on Physical Review Letters | null | 10.1103/PhysRevLett.100.114101 | null | cond-mat.dis-nn | null | We study the problem of synchronizing a general complex network by means of
an adaptive strategy in the case where the network topology is slowly time
varying and every node receives at each time only one aggregate signal from the
set of its neighbors. We introduce an appropriately defined potential that each
node seeks to minimize in order to reach/maintain synchronization. We show that
our strategy is effective in tracking synchronization as well as in achieving
synchronization when appropriate conditions are met.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 00:26:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sorrentino",
"Francesco",
""
],
[
"Ott",
"Edward",
""
]
] | [
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] |
802.1242 | Harsha Sanjeev Kumar | Harsha Sanjeev Kumar, Samar Safi-Harb | Variability of the High-Magnetic Field X-ray Pulsar PSR J1846-0258
Associated with the Supernova Remnant Kes 75 as Revealed by the Chandra X-ray
Observatory | Accepted by the Astrophysical Journal (Letters) | null | null | null | astro-ph | null | We present results from the archival Chandra observations of the 0.3 s X-ray
pulsar PSR J1846-0258 associated with the supernova remnant (SNR) Kes 75. The
pulsar has the highest spin-down luminosity (Edot = 8.3e36 erg/s) among all the
high magnetic field pulsars (HBPs) and has been classified as a Crab-like
pulsar despite its magnetic field (5e13 G) being above the quantum critical
field. It is the only HBP described by a non-thermal Crab-like spectrum,
powering a bright pulsar wind nebula (PWN). Our spectroscopic study shows
evidence of spectral softening (photon index = 1.32 to 1.97) and temporal
brightening (unabsorbed flux = 4.3e-12 to 2.7e-11 erg/cm^2/s) of the pulsar by
~6 times from 2000 to 2006. The 0.5-10 keV luminosity of the pulsar at the
revised distance of 6 kpc has also increased from 1.85e34 to 1.16e35 erg/s, and
the X-ray efficiency increased from 0.2% to 1.4%. The observed X-ray
brightening and softening of the pulsar suggests for the first time that this
HBP is revealing itself as a magnetar.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 21:21:55 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 16:26:09 GMT"
},
{
"version": "v3",
"created": "Mon, 17 Mar 2008 19:14:20 GMT"
}
] | 2008-03-17T00:00:00 | [
[
"Kumar",
"Harsha Sanjeev",
""
],
[
"Safi-Harb",
"Samar",
""
]
] | [
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] |
802.1243 | Sayipjamal Dulat | Sayipjamal Dulat and Kang Li | The Aharonov-Casher effect for spin-1 particles in non-commutative
quantum mechanics | 5 pages, RevTex | Eur.Phys.J.C54:333-337,2008 | 10.1140/epjc/s10052-008-0522-9 | null | math-ph hep-th math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using a generalized Bopp's shift formulation, instead of star product
method, we investigate the Aharonov-Casher(AC) effect for a spin-1 neutral
particle in non-commutative(NC) quantum mechanics. After solving the Kemmer
equations both on a non-commutative space and a non-commutative phase space, we
obtain the corrections to the topological phase of the AC effect for a spin-1
neutral particle both on a NC space and a NC phase space.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 04:22:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dulat",
"Sayipjamal",
""
],
[
"Li",
"Kang",
""
]
] | [
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] |
802.1244 | Shuheng Zhou | Shuheng Zhou | Learning Balanced Mixtures of Discrete Distributions with Small Sample | 24 Pages, 5 figures | null | null | null | cs.LG stat.ML | null | We study the problem of partitioning a small sample of $n$ individuals from a
mixture of $k$ product distributions over a Boolean cube $\{0, 1\}^K$ according
to their distributions. Each distribution is described by a vector of allele
frequencies in $\R^K$. Given two distributions, we use $\gamma$ to denote the
average $\ell_2^2$ distance in frequencies across $K$ dimensions, which
measures the statistical divergence between them. We study the case assuming
that bits are independently distributed across $K$ dimensions. This work
demonstrates that, for a balanced input instance for $k = 2$, a certain
graph-based optimization function returns the correct partition with high
probability, where a weighted graph $G$ is formed over $n$ individuals, whose
pairwise hamming distances between their corresponding bit vectors define the
edge weights, so long as $K = \Omega(\ln n/\gamma)$ and $Kn = \tilde\Omega(\ln
n/\gamma^2)$. The function computes a maximum-weight balanced cut of $G$, where
the weight of a cut is the sum of the weights across all edges in the cut. This
result demonstrates a nice property in the high-dimensional feature space: one
can trade off the number of features that are required with the size of the
sample to accomplish certain tasks like clustering.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 07:38:49 GMT"
}
] | 2008-02-21T00:00:00 | [
[
"Zhou",
"Shuheng",
""
]
] | [
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] |
802.1245 | Masaki Kashiwara | Masaki Kashiwara and Pierre Schapira | Deformation quantization modules I:Finiteness and duality | The contents of this paper is now included in Deformation
quantization modules (arXiv:1003.3304). | null | null | null | math.QA math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the notion of being cohomologically complete for objects of the
derived category of sheaves of $Z[\hbar]$-modules on a topological space. Then
we consider a $Z[\hbar]$-algebra satisfying some suitable conditions and prove
coherency results by using the property of being cohomologically complete.
We apply these results to the study of modules over deformation quantization
algebroids on complex Poisson manifolds. We prove in particular that under a
natural properness condition, the convolution of two coherent kernels over such
algebroids is coherent. We also construct the dualizing complexes in this
framework and show that the convolution of kernels commutes with duality.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 05:36:41 GMT"
},
{
"version": "v2",
"created": "Sun, 15 Jun 2008 03:00:19 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Jul 2009 13:53:29 GMT"
},
{
"version": "v4",
"created": "Fri, 19 Mar 2010 07:01:09 GMT"
}
] | 2010-03-22T00:00:00 | [
[
"Kashiwara",
"Masaki",
""
],
[
"Schapira",
"Pierre",
""
]
] | [
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] |
802.1246 | Austen Lamacraft | Austen Lamacraft and Paul Fendley | Order parameter statistics in the critical quantum Ising chain | null | Phys. Rev. Lett. 100, 165706 (2008) | 10.1103/PhysRevLett.100.165706 | null | cond-mat.stat-mech | null | In quantum spin systems obeying hyperscaling, the probability distribution of
the total magnetization takes on a universal scaling form at criticality. We
obtain this scaling function exactly for the ground state and first excited
state of the critical quantum Ising spin chain. This is achieved through a
remarkable relation to the partition function of the anisotropic Kondo problem,
which can be computed by exploiting the integrability of the system.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 12:57:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lamacraft",
"Austen",
""
],
[
"Fendley",
"Paul",
""
]
] | [
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] |
802.1247 | Qiuping A. Wang | Y. Kaupp (ISMANS), S. Liraki (ISMANS), D. Tayurskii (ISMANS), A.
Useinovb (ISMANS), A. El Kaabouchi (ISMANS), L. Nivanen (ISMANS), B. Minisini
(ISMANS), F. Tsobnang (ISMANS), A. Le M\'ehaut\'e (ISMANS), Q. A. Wang
(ISMANS) | Understanding heavy fermion from generalized statistics | null | Journal of Low Temperature Physics 150 (2008) 660-666 | 10.1007/s10909-007-9598-0 | null | cond-mat.stat-mech | null | Heavy electrons in superconducting materials are widely studied with the
Kondo lattice t-J model. Numerical results have shown that the Fermi surface of
these correlated particles undergoes a flattening effect according to the
coupling degree J. This behaviour is not easy to understand from the
theoretical point of view within standard Fermi-Dirac statistics and
non-standard theories such as fractional exclusion statistics for anyons and
Tsallis nonextensive statistics. The present work is an attempt to account for
the heavy electron distribution within incomplete statistics (IS) which is
developed for complex systems with interactions which make the statistics
incomplete such that sum_i p_i^q=1. The parameter q, when different from unity,
characterizes the incompleteness of the statistics. It is shown that the
correlated electrons can be described with the help of IS with q related to the
coupling constant J in the context of Kondo model
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 06:23:53 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Kaupp",
"Y.",
"",
"ISMANS"
],
[
"Liraki",
"S.",
"",
"ISMANS"
],
[
"Tayurskii",
"D.",
"",
"ISMANS"
],
[
"Useinovb",
"A.",
"",
"ISMANS"
],
[
"Kaabouchi",
"A. El",
"",
"ISMANS"
],
[
"Nivanen",
"L.",
"",
"ISMANS"
],
[
"Minisini",
"B.",
"",
"ISMANS"
],
[
"Tsobnang",
"F.",
"",
"ISMANS"
],
[
"Méhauté",
"A. Le",
"",
"ISMANS"
],
[
"Wang",
"Q. A.",
"",
"ISMANS"
]
] | [
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] |
802.1248 | Qiuping A. Wang | A. Lawani (ISMANS), J. Le Meur (ISMANS), D. Tayurskii (ISMANS), A. El
Kaabouchi (ISMANS), L. Nivanen (ISMANS), B. Minisini (ISMANS), F. Tsobnang
(ISMANS), M. Pezeril (ISMANS), A. Le M\'ehaut\'e (ISMANS), Q. A. Wang
(ISMANS) | A nonextensive approach to Bose-Einstein condensation of trapped
interacting boson gas | null | Journal of Low Temperature Physics 150 (2008) 605-611 | 10.1007/s10909-007-9596-2 | null | cond-mat.stat-mech | null | In the Bose-Einstein condensation of interacting atoms or molecules such as
87Rb, 23Na and 7Li, the theoretical understanding of the transition temperature
is not always obvious due to the interactions or zero point energy which cannot
be exactly taken into account. The S-wave collision model fails sometimes to
account for the condensation temperatures. In this work, we look at the problem
within the nonextensive statistics which is considered as a possible theory
describing interacting systems. The generalized energy Uq and the particle
number Nq of boson gas are given in terms of the nonextensive parameter q. q>1
(q<1) implies repulsive (attractive) interaction with respect to the perfect
gas. The generalized condensation temperature Tcq is derived versus Tc given by
the perfect gas theory. Thanks to the observed condensation temperatures, we
find q ~ 0.1 for 87Rb atomic gas, q ~ 0.95 for 7Li and q ~ 0.62 for 23Na. It is
concluded that the effective interactions are essentially attractive for the
three considered atoms, which is consistent with the observed temperatures
higher than those predicted by the conventional theory.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 06:26:06 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Lawani",
"A.",
"",
"ISMANS"
],
[
"Meur",
"J. Le",
"",
"ISMANS"
],
[
"Tayurskii",
"D.",
"",
"ISMANS"
],
[
"Kaabouchi",
"A. El",
"",
"ISMANS"
],
[
"Nivanen",
"L.",
"",
"ISMANS"
],
[
"Minisini",
"B.",
"",
"ISMANS"
],
[
"Tsobnang",
"F.",
"",
"ISMANS"
],
[
"Pezeril",
"M.",
"",
"ISMANS"
],
[
"Méhauté",
"A. Le",
"",
"ISMANS"
],
[
"Wang",
"Q. A.",
"",
"ISMANS"
]
] | [
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802.1249 | Guillaume Faye | Luc Blanchet, Guillaume Faye, Bala R. Iyer, Siddhartha Sinha | The third post-Newtonian gravitational wave polarisations and associated
spherical harmonic modes for inspiralling compact binaries in quasi-circular
orbits | includes corrections to be published in an erratum; the changes are:
in Eq (5.15b), -484/105 -> -188/35; in Eq (8.9g), 81127/10080 -> 1369/160; Eq
(8.10g), -48239/5040 -> -2419/240; Eq (9.4b), -995/84 -> -353/28 | Class.Quant.Grav.25:165003,2008 | 10.1088/0264-9381/25/16/165003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational waveform (GWF) generated by inspiralling compact binaries
moving in quasi-circular orbits is computed at the third post-Newtonian (3PN)
approximation to general relativity. Our motivation is two-fold: (i) To provide
accurate templates for the data analysis of gravitational wave inspiral signals
in laser interferometric detectors; (ii) To provide the associated
spin-weighted spherical harmonic decomposition to facilitate comparison and
match of the high post-Newtonian prediction for the inspiral waveform to the
numerically-generated waveforms for the merger and ringdown. This extension of
the GWF by half a PN order (with respect to previous work at 2.5PN order) is
based on the algorithm of the multipolar post-Minkowskian formalism, and
mandates the computation of the relations between the radiative, canonical and
source multipole moments for general sources at 3PN order. We also obtain the
3PN extension of the source multipole moments in the case of compact binaries,
and compute the contributions of hereditary terms (tails, tails-of-tails and
memory integrals) up to 3PN order. The end results are given for both the
complete plus and cross polarizations and the separate spin-weighted spherical
harmonic modes.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 07:12:40 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Aug 2008 12:03:34 GMT"
},
{
"version": "v3",
"created": "Fri, 19 Oct 2012 17:44:28 GMT"
}
] | 2012-10-22T00:00:00 | [
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Iyer",
"Bala R.",
""
],
[
"Sinha",
"Siddhartha",
""
]
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802.125 | Adolfo Zamora | Juan M. Romero, Adolfo Zamora | The Area Quantum and Snyder Space | 7 pages, in Press, Physics Letters B | Phys.Lett.B661:11-13,2008 | 10.1016/j.physletb.2008.02.001 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in the Snyder space the area of the disc and of the sphere can
be quantized. It is also shown that the area spectrum of the sphere can be
related to the Bekenstein conjecture for the area spectrum of a black hole
horizon.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 07:59:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Romero",
"Juan M.",
""
],
[
"Zamora",
"Adolfo",
""
]
] | [
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802.1251 | Yuri A. Kordyukov | Andrey A. Yakovlev | Adiabatic limits on Riemannian Sol-manifolds | 3 pages, to appear in Math. Notes | null | 10.1070/SM2008v199n02ABEH003921 | null | math.DG math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain an asymptotic formula for the spectrum distribution function of the
Laplace operator on a compact Riemannian Sol-manifold in the adiabatic limit
determined by a one-dimensional foliation defined by the orbits of a
left-invariant flow.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 09:19:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yakovlev",
"Andrey A.",
""
]
] | [
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802.1252 | Chris Stock | C. Stock, W.J.L. Buyers, Z. Yamani, Z. Tun, R. J. Birgeneau, R. Liang,
D. Bonn, W. N. Hardy | Spin dynamics near the critical doping in weakly-superconducting
underdoped YBa2Cu3O6.35 (Tc=18K) | 22 pages, 19 figures, accepted for publication in Phys. Rev. B | null | 10.1103/PhysRevB.77.104513 | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using neutron scattering we have determined the magnetic structure and
fluctuations in the YBa2Cu3O6.35 superconductor (Tc=18 K). The long-range
ordered collinear spins of the insulating antiferromagnet are replaced by a
commensurate central mode arising from slow, isotropically polarized,
short-range spin correlations. The inelastic spectrum up to 30 meV is broad in
wave vector and commensurate. In contrast to the the resonance peak of higher
Tc superconductors, the spins exhibit a single overdamped spectrum whose rate
of relaxation decreases on cooling and saturates at 5 meV below 50 K. As the
relaxation rate saturates the quasi-static spin correlations grow and become
resolution limited in energy. The spin susceptibility at high temperatures
illustrates that the dominant energy scale is set by the temperature. At low
temperatures, the scale length is geometric and not linked by velocity to
dynamic widths. There is no observable suppression of the spin fluctuations or
central mode upon the onset of superconductivity. The spins respond not to
coherent charge pairs but to hole doping allowing coexistence of glassy short
range spin order with superconductivity. Since the physics of the weakly
superconducting system YBCO6.35 must connect continuously with that in more
strongly superconducting YBCO6.5, we find that neither incommensurate
stripe-like spin modulations nor a well-defined neutron spin resonance are
essential for the onset with doping of pairing in a high temperature cuprate
superconductor.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 09:30:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stock",
"C.",
""
],
[
"Buyers",
"W. J. L.",
""
],
[
"Yamani",
"Z.",
""
],
[
"Tun",
"Z.",
""
],
[
"Birgeneau",
"R. J.",
""
],
[
"Liang",
"R.",
""
],
[
"Bonn",
"D.",
""
],
[
"Hardy",
"W. N.",
""
]
] | [
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0.1087150872,
0.0310787559,
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0.0191486795,
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] |
802.1253 | Anatoly G. Meshkov | Anatoly G. Meshkov and Maxim Ju. Balakhnev | Two-Field Integrable Evolutionary Systems of the Third Order and Their
Differential Substitutions | Published in SIGMA (Symmetry, Integrability and Geometry: Methods and
Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4 (2008), 018, 29 pages | 10.3842/SIGMA.2008.018 | null | nlin.SI math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/3.0/ | A list of forty third-order exactly integrable two-field evolutionary systems
is presented. Differential substitutions connecting various systems from the
list are found. It is proved that all the systems can be obtained from only two
of them. Examples of zero curvature representations with $4 \times 4$ matrices
are presented.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 09:50:13 GMT"
}
] | 2008-04-25T00:00:00 | [
[
"Meshkov",
"Anatoly G.",
""
],
[
"Balakhnev",
"Maxim Ju.",
""
]
] | [
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] |
802.1254 | Jonathan Tennyson | Gabriela Halmova, J.D. Gorfinkiel and Jonathan Tennyson | Low and intermediate energy electron collisions with the C$_2^-$
molecular anion | 18 pages, 5 figures constructed from 8 files | J. Phys. B: At. Mol. Opt. Phys., 41, 155201 (2008) | 10.1088/0953-4075/41/15/155201 | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Calculations are presented which use the molecular R-matrix with
pseudo-states (MRMPS) method to treat electron impact electron detachment and
electronic excitation of the carbon dimer anion. Resonances are found above the
ionisation threshold of C$_2^-$ with $^1\Sigma^+_g$, $^1\Pi_g$ and $^3\Pi_g$
symmetry. These are shape resonances trapped by the effect of an attractive
polarisation potential competing with a repulsive Coulomb interaction. The
$\Pi_g$ resonances are found to give structure in the detachment cross section
similar to that observed experimentally. Both excitation and detachment cross
sections are found to be dominated by large impact parameter collisions whose
contribution is modelled using the Born approximation.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 10:03:10 GMT"
}
] | 2010-07-07T00:00:00 | [
[
"Halmova",
"Gabriela",
""
],
[
"Gorfinkiel",
"J. D.",
""
],
[
"Tennyson",
"Jonathan",
""
]
] | [
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802.1255 | J\'er\'emy Blanc | J\'er\'emy Blanc | The correspondence between a plane curve and its complement | 9 pages, 3 figures | J. Reine Angew. Math. 633 (2009), 1-10 | 10.1515/CRELLE.2009.057 | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given two irreducible curves of the plane which have isomorphic complements,
it is natural to ask whether there exists an automorphism of the plane that
sends one curve on the other.
This question has a positive answer for a large family of curves and
H.Yoshihara conjectured that it is true in general. We exhibit counterexamples
to this conjecture, over any ground field. In some of the cases, the curves are
isomorphic and in others not; this provides counterexamples of two different
kinds.
Finally, we use our construction to find the existence of surprising
non-linear automorphisms of affine surfaces.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 10:52:18 GMT"
}
] | 2010-11-22T00:00:00 | [
[
"Blanc",
"Jérémy",
""
]
] | [
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] |
802.1256 | Adam Skalski | Uwe Franz, Adam Skalski | On ergodic properties of convolution operators associated with compact
quantum groups | 10 pages, to appear in Colloquium Mathematicum. (v2 corrects the
unwieldy text format) | Colloq. Math. 113, no. 1, 13-23, 2008 | 10.4064/cm113-1-2 | null | math.OA math.FA | null | Recent results of M.Junge and Q.Xu on the ergodic properties of the averages
of kernels in noncommutative L^p-spaces are applied to the analysis of the
almost uniform convergence of operators induced by the convolutions on compact
quantum groups.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 11:47:50 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 12:16:11 GMT"
}
] | 2021-04-21T00:00:00 | [
[
"Franz",
"Uwe",
""
],
[
"Skalski",
"Adam",
""
]
] | [
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802.1257 | Martial Mazars Dr. | Carlos Alvarez, Martial Mazars and Jean-Jacques Weis | Structure and thermodynamics of a ferrofluid bilayer | 45 pages, 4 Tables, 9 Figures | Physical Review E 77, 051501 (2008) | 10.1103/PhysRevE.77.051501 | Preprint LPT-Orsay : 08 - 21 | cond-mat.mtrl-sci cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present extensive Monte Carlo simulations for the thermodynamic and
structural properties of a planar bilayer of dipolar hard spheres for a wide
range of densities, dipole moments and layer separations. Expressions for the
stress and pressure tensors of the bilayer system are derived. For all
thermodynamic states considered the interlayer energy is shown to be attractive
and much smaller than the intralayer contribution to the energy. It vanishes at
layer separations of the order of two hard sphere diameters. The normal
pressure is negative and decays as a function of layer separation $h$ as
$-1/h^5$. Intralayer and interlayer pair distribution functions and angular
correlation functions are presented. Despite the weak interlayer energy strong
positional and orientational correlations exist between particles in the two
layers.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 11:46:58 GMT"
}
] | 2010-09-08T00:00:00 | [
[
"Alvarez",
"Carlos",
""
],
[
"Mazars",
"Martial",
""
],
[
"Weis",
"Jean-Jacques",
""
]
] | [
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802.1258 | Heng Lian | Heng Lian | Bayesian Nonlinear Principal Component Analysis Using Random Fields | null | null | null | null | cs.CV cs.LG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel model for nonlinear dimension reduction motivated by the
probabilistic formulation of principal component analysis. Nonlinearity is
achieved by specifying different transformation matrices at different locations
of the latent space and smoothing the transformation using a Markov random
field type prior. The computation is made feasible by the recent advances in
sampling from von Mises-Fisher distributions.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 12:22:47 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Lian",
"Heng",
""
]
] | [
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] |
802.1259 | Sabbah Claude | Claude Sabbah | Universal unfoldings of Laurent polynomials and tt* structures | 28 pages, submitted to the proceedings of the conference 'From tQFT
to tt* and integrability', Augsburg 2007. Revised version | in From Hodge theory to integrability and TQFT tt*-geometry, Proc.
Sympos. Pure Math., vol. 78, Amer. Math. Soc., Providence, RI, 2008, p. 1-29 | null | null | math.AG math.CV | null | This article surveys the relations between harmonic Higgs bundles and Saito
structures which lead to tt* geometry on Frobenius manifolds. We give the main
lines of the proof of the existence of a canonical tt* structure on the base
space of the universal unfolding of convenient and nondegenerate Laurent
polynomials.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 12:38:45 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 14:17:40 GMT"
},
{
"version": "v3",
"created": "Fri, 25 Apr 2008 13:25:46 GMT"
}
] | 2011-01-04T00:00:00 | [
[
"Sabbah",
"Claude",
""
]
] | [
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] |
802.126 | Daniel Caro | Daniel Caro | A characterization of the overcoherence | 10 pages | null | null | null | math.AG | null | Let $\mathcal{P}$ be a proper smooth formal $\mathcal{V}$-scheme, $X$ a
closed subscheme of the special fiber of $\mathcal{P}$, $\mathcal{E} \in
F\text{-}D ^\mathrm{b}_\mathrm{coh} (\D ^\dag_{\mathcal{P},\mathbb{Q}})$ with
support in $X$. We check that $\mathcal{E}$ is $\D ^\dag
_{\mathcal{P},\mathbb{Q}}$-overcoherent if and only if, for any morphism $f :
\mathcal{P}' \to \mathcal{P}$ of smooth formal $\mathcal{V}$-schemes, $f ^!
(\mathcal{E}) $ is $\D ^\dag_{\mathcal{P}', \mathbb{Q}}$-coherent.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 09:16:07 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Caro",
"Daniel",
""
]
] | [
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] |
802.1261 | Gennady El | G.A. El, A.M. Kamchatnov, M.V. Pavlov and S.A. Zykov | Kinetic equation for a soliton gas and its hydrodynamic reductions | 39 pages, 1 figure. Extended version; to appear in Journal of
Nonlinear Science | null | null | null | nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce and study a new class of kinetic equations, which arise in the
description of nonequilibrium macroscopic dynamics of soliton gases with
elastic collisions between solitons. These equations represent nonlinear
integro-differential systems and have a novel structure, which we investigate
by studying in detail the class of $N$-component `cold-gas' hydrodynamic
reductions. We prove that these reductions represent integrable linearly
degenerate hydrodynamic type systems for arbitrary $N$ which is a strong
evidence in favour of integrability of the full kinetic equation. We derive
compact explicit representations for the Riemann invariants and characteristic
velocities of the hydrodynamic reductions in terms of the `cold-gas' component
densities and construct a number of exact solutions having special properties
(quasi-periodic, self-similar). Hydrodynamic symmetries are then derived and
investigated. The obtained results shed the light on the structure of a
continuum limit for a large class of integrable systems of hydrodynamic type
and are also relevant to the description of turbulent motion in conservative
compressible flows.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 14:02:46 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jan 2010 20:46:25 GMT"
},
{
"version": "v3",
"created": "Wed, 15 Sep 2010 20:31:09 GMT"
}
] | 2010-09-17T00:00:00 | [
[
"El",
"G. A.",
""
],
[
"Kamchatnov",
"A. M.",
""
],
[
"Pavlov",
"M. V.",
""
],
[
"Zykov",
"S. A.",
""
]
] | [
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] |
802.1262 | Tanguy Pierog | T. Pierog, R. Engel, D. Heck, S. Ostapchenko, K. Werner | Latest Results from the Air Shower Simulation Programs CORSIKA and CONEX | 4 pages, 5 figures, FZKA-7340 pp 149-152. Prepared for 30th
International Cosmic Ray Conference (ICRC 2007), Merida, Yucatan, Mexico,
3-11 Jul 2007 | null | null | FZKA-7340 | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interpretation of EAS measurements strongly depends on detailed air shower
simulations. The uncertainty in the prediction of shower observables for
different primary particles and energies is currently dominated by differences
between hadronic interaction models. The new models QGSJETII-3 and EPOS 1.6,
which reproduce all major results of existing accelerator data (including
detailed data of RHIC experiments for EPOS), have been implemented in the air
shower simulation programs CORSIKA and CONEX. We show predictions of these new
models and compare them with those from older models such as QGSJET01 or
SIBYLL. Results for important air shower observables are discussed in detail.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 14:21:24 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Pierog",
"T.",
""
],
[
"Engel",
"R.",
""
],
[
"Heck",
"D.",
""
],
[
"Ostapchenko",
"S.",
""
],
[
"Werner",
"K.",
""
]
] | [
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] |
802.1263 | Ashis Mandal | Alice Fialowski and Ashis Mandal | Leibniz algebra deformations of a Lie algebra | 15 pages | null | 10.1063/1.2981562 | null | math.KT math.QA | http://creativecommons.org/licenses/by/3.0/ | In this note we compute Leibniz algebra deformations of the 3-dimensional
nilpotent Lie algebra $\mathfrak{n}_3$ and compare it with its Lie
deformations. It turns out that there are 3 extra Leibniz deformations. We also
describe the versal Leibniz deformation of $\mathfrak{n}_3$ with the versal
base.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 14:24:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fialowski",
"Alice",
""
],
[
"Mandal",
"Ashis",
""
]
] | [
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802.1264 | Mubasher Jamil | Francesco De Paolis, Mubasher Jamil and Asghar Qadir | Black Holes in Bulk Viscous Cosmology | 20 pages, 3 figures, accepted for publication in Int. J. Theor. Phys | Int.J.Theor.Phys.49:621-632,2010 | 10.1007/s10773-009-0242-4 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effects of the accretion of phantom energy with non-zero
bulk viscosity onto a Schwarzschild black hole and show that black holes
accreting viscous phantom energy will lose mass rapidly compared to the
non-viscous case. When matter is incorporated along with the phantom energy,
the black holes meet with the same fate as bulk viscous forces dominate matter
accretion. If the phantom energy has large bulk viscosity, then the mass of the
black hole will reduce faster than in the small viscosity case.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 14:27:01 GMT"
},
{
"version": "v2",
"created": "Sat, 10 May 2008 11:08:16 GMT"
},
{
"version": "v3",
"created": "Sat, 13 Dec 2008 13:44:48 GMT"
},
{
"version": "v4",
"created": "Tue, 22 Dec 2009 14:17:40 GMT"
}
] | 2010-03-02T00:00:00 | [
[
"De Paolis",
"Francesco",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Qadir",
"Asghar",
""
]
] | [
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802.1265 | Reza Ejtehadi | B. Eslami-Mossallam and M.R. Ejtehadi | Stretching An Anisotropic DNA | 29 pages and 4 figure. To appear in J. Chem. Phys | null | 10.1063/1.2842065 | null | cond-mat.soft cond-mat.mtrl-sci cond-mat.stat-mech physics.bio-ph q-bio.BM | null | We present a perturbation theory to find the response of an anisotropic DNA
to the external tension. It is shown that the anisotropy has a nonzero but
small contribution to the force-extension curve of the DNA. Thus an anisotropic
DNA behaves like an isotropic one with an effective bending constant equal to
the harmonic average of its soft and hard bending constants.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 15:28:26 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Eslami-Mossallam",
"B.",
""
],
[
"Ejtehadi",
"M. R.",
""
]
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] |
802.1266 | Paul Voutier | P. M. Voutier | Rational approximations to $\sqrt[3]{2}$ and other algebraic numbers
revisited | published version, but with some small changes, including typo in
statement of Lemma 5.1(b), leading to simpler proof of Theorem 2.1 | Journal de Th\'eorie des Nombres de Bordeaux 19 (2007), 265-288 | 10.5802/jtnb.586 | null | math.NT math.CA | http://creativecommons.org/licenses/by-nc-sa/3.0/ | In this paper, we establish improved effective irrationality measures for
certain numbers of the form $\sqrt[3]{n}$, using approximations obtained from
hypergeometric functions. These results are very close to the best possible
using this method. We are able to obtain these results by determining very
precise arithmetic information about the denominators of the coefficients of
these hypergeometric functions. Improved bounds for $\theta(k,l;x)$ and
$\psi(k,l;x)$ for $k=1,3,4,6$ are also presented.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 14:32:30 GMT"
}
] | 2012-02-01T00:00:00 | [
[
"Voutier",
"P. M.",
""
]
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802.1267 | Stefan Westerhoff | Paul Sommers, Stefan Westerhoff | Cosmic Ray Astronomy | 27 pages, 3 figures, review to appear in New Journal of Physics
[Focus Issue] | New J.Phys.11:055004,2009 | 10.1088/1367-2630/11/5/055004 | null | astro-ph | null | Cosmic ray astronomy attempts to identify and study the sources of ultrahigh
energy cosmic rays. It is unique in its reliance on charged particles as the
information carriers. While no discrete source of ultrahigh energy cosmic rays
has been identified so far, a new generation of detectors is acquiring the huge
exposure that is needed at the highest energies, where deflection by magnetic
fields is minimized and the background from distant sources is eliminated by
pion photoproduction. In this paper, we summarize the status of cosmic ray
astronomy, describing the detectors and the analysis techniques.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 15:25:07 GMT"
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] | 2010-01-15T00:00:00 | [
[
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"Paul",
""
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[
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] |
802.1268 | Mircea Neagu | Mircea Neagu | Jet Berwald-Riemann-Lagrange Geometrization for Affine Maps between
Finsler Manifolds | 22 pages | BSG Proceedings 21 (2014), 108-127 | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we introduce a natural definition for the affine maps between
two Finsler manifolds $(M, F)$ and $(N,\tilde F)$ and we give some geometrical
properties of these affine maps. Starting from the equations of the affine
maps, we construct a natural Berwald-Riemann-Lagrange geometry on the 1-jet
space $J^1(TM;N)$, in the sense of a Berwald nonlinear connection
$\Gamma^b_jet$, a Berwald $\Gamma^b_jet$-linear d-connection $B\Gamma^b_jet$,
together with its d-torsions and d-curvatures, which geometrically
characterizes the initial affine maps between Finsler manifolds.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 15:38:29 GMT"
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] | 2016-07-08T00:00:00 | [
[
"Neagu",
"Mircea",
""
]
] | [
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] |
802.1269 | Manuel Valverde | M. Valverde, J. Nieves, E. Hern\'andez, S.K. Singh, M.J. Vicente Vacas | Production of Two Pions Induced by Neutrinos | Contribution to the proceedings of Chiral07, RCNP, Osaka, Japan.
Corrected version because of problems on some pdf viewers | Mod.Phys.Lett.A23:2309-2312,2008 | 10.1142/S0217732308029265 | null | hep-ph | null | We study the threshold production of two pions induced by neutrinos in
nucleon targets. The contribution of nucleon pole, pion and contact terms is
calculated using a chiral Lagrangian. The contribution of the Roper resonance,
neglected in earlier studies, has also been taken into account.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 15:59:46 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 18:54:12 GMT"
}
] | 2009-10-08T00:00:00 | [
[
"Valverde",
"M.",
""
],
[
"Nieves",
"J.",
""
],
[
"Hernández",
"E.",
""
],
[
"Singh",
"S. K.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] | [
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802.127 | Michela Mapelli | Kajal K. Ghosh (1) and Michela Mapelli (2) ((1)USRA/NSSTC/MSFC/NASA,
(2)University of Zurich) | UGC 7069: The largest ring galaxy | 6 pages, 5 figures, MNRAS Letters, in press | null | 10.1111/j.1745-3933.2008.00456.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find that UGC 7069 is the largest ring galaxy known to date. In this
Letter, we present a multiwavelength study of this galaxy (combining radio,
2MASS, optical and ultraviolet data). The ring of UGC 7069, whose diameter
measures ~115 kpc, is also warped at its edges. The nucleus appears
double-peaked and hosts a possible LINER. The ultraviolet data indicate a
strong blue colour and suggest that UGC 7069 is a starburst galaxy. We also
present N-body simulation results, which indicate that galaxy collisions can
produce such huge rings. Large inclination angles between the target and the
intruder galaxy may account for the formation of warped rings. Multiwavelength
observations are highly essential to constrain our simulation results, which
will address the formation and evolution of such a rare galaxy.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 15:59:46 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 09:45:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ghosh",
"Kajal K.",
""
],
[
"Mapelli",
"Michela",
""
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] |
802.1271 | Peter Kleinert | P. Kleinert | Superconductivity from four Fermion complexes | 10 pages, 2 figures | null | null | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superconductivity is studied for a fermionic system with attractive four-body
interaction. Applying a Green function approach, the gap equation is derived.
From the solution, the transition temperature is calculated. Under the
condition that the respective coupling constants are comparable, the transition
temperature of four-fermion complexes is considerably larger than the
corresponding BCS value.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:22:53 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Kleinert",
"P.",
""
]
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] |
802.1272 | Luciano da Fontoura Costa | Luciano da Fontoura Costa | Activation Confinement Inside Complex Networks Communities | 18 pages, 15 figures. A working manuscrip. Suggestions and comments
welcomed | null | null | null | physics.soc-ph cond-mat.dis-nn physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work it is described how to enhance and generalize the equivalent
model (arXiv:0802.0421) of integrate-and-fire dynamics in order to treat any
complex neuronal networks, especially those exibiting modular structure. It has
been shown that, though involving only a handful of equivalent neurons, the
modular equivalent model was capable of providing impressive predictions about
the non-linear integrate-and-fire dynamics in two hybrid modular networks. The
reported approach has also allowed the identification of the causes of
transient spiking confinement within the network communities, which correspond
to the fact that the little activation sent from the source community to the
others implies in long times for reaching the nearly-simultaneous activation of
the concentric levels at the other communities and respective avalanches.
Several other insights are reported in this work, including the smoothing of
the spiking functions, the consideration of intra-ring connections and its
effects, as well as the identification of how the weights in the equivalent
model change for different source nodes. This work has paved the way for a
number of promising developments, which are identified and discussed.
Preliminary results are also described which reveal waves induced by the
integrate-and-fire dynamics along the steady-state regime.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 16:13:32 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Costa",
"Luciano da Fontoura",
""
]
] | [
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802.1273 | Daniel Bramich | D.M. Bramich | A New Algorithm For Difference Image Analysis | MNRAS Letters Accepted | null | 10.1111/j.1745-3933.2008.00464.x | null | astro-ph | null | In the context of difference image analysis (DIA), we present a new method
for determining the convolution kernel matching a pair of images of the same
field. Unlike the standard DIA technique which involves modelling the kernel as
a linear combination of basis functions, we consider the kernel as a discrete
pixel array and solve for the kernel pixel values directly using linear
least-squares. The removal of basis functions from the kernel model is
advantageous for a number of compelling reasons. Firstly, it removes the need
for the user to specify such functions, which makes for a much simpler user
application and avoids the risk of an inappropriate choice. Secondly, basis
functions are constructed around the origin of the kernel coordinate system,
which requires that the two images are perfectly aligned for an optimal result.
The pixel kernel model is sufficiently flexible to correct for image
misalignments, and in the case of a simple translation between images, image
resampling becomes unnecessary. Our new algorithm can be extended to spatially
varying kernels by solving for individual pixel kernels in a grid of image
sub-regions and interpolating the solutions to obtain the kernel at any one
pixel.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:33:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bramich",
"D. M.",
""
]
] | [
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802.1274 | Jose M. Martin-Garcia | Jose M. Martin-Garcia, David Yllanes, Renato Portugal | The Invar tensor package: Differential invariants of Riemann | 12 pages, 1 figure, 3 tables. Package can be downloaded from
http://metric.iem.csic.es/Martin-Garcia/xAct/Invar/ (Mathematica version) or
http://www.lncc.br/~portugal/Invar.html (Maple version) | Comp.Phys.Commun.179:586-590,2008 | 10.1016/j.cpc.2008.04.018 | null | cs.SC gr-qc hep-th | null | The long standing problem of the relations among the scalar invariants of the
Riemann tensor is computationally solved for all 6x10^23 objects with up to 12
derivatives of the metric. This covers cases ranging from products of up to 6
undifferentiated Riemann tensors to cases with up to 10 covariant derivatives
of a single Riemann. We extend our computer algebra system Invar to produce
within seconds a canonical form for any of those objects in terms of a basis.
The process is as follows: (1) an invariant is converted in real time into a
canonical form with respect to the permutation symmetries of the Riemann
tensor; (2) Invar reads a database of more than 6x10^5 relations and applies
those coming from the cyclic symmetry of the Riemann tensor; (3) then applies
the relations coming from the Bianchi identity, (4) the relations coming from
commutations of covariant derivatives, (5) the dimensionally-dependent
identities for dimension 4, and finally (6) simplifies invariants that can be
expressed as product of dual invariants. Invar runs on top of the tensor
computer algebra systems xTensor (for Mathematica) and Canon (for Maple).
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:38:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Martin-Garcia",
"Jose M.",
""
],
[
"Yllanes",
"David",
""
],
[
"Portugal",
"Renato",
""
]
] | [
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] |
802.1275 | J.-L. Barrat | Anatolii Mokshin (LPMCN), J.-L. Barrat (LPMCN) | Shear induced crystallization of an amorphous system | null | null | 10.1103/PhysRevE.77.021505 | null | cond-mat.mtrl-sci | null | The influence of a stationary shear flow on the crystallization in a glassy
system is studied by means of molecular dynamics simulations and subsequent
cluster analysis. The results reveal two opposite effects of the shear flow on
the processes of topological ordering in the system. Shear promotes the
formation of separated crystallites and suppresses the appearance of the large
clusters. The shear-induced ordering proceeds in two stages, where the first
stage is related mainly with the growth of crystallites, whereas the second
stage is due to an adjustment of the created clusters and a progressive
alignment of their lattice directions. The influence of strain and shear rate
on the crystallization is also investigated. In particular, we find two
plausible phenomenological relations between the shear rate and the
characteristic time scale needed for ordering of the amorphous system under
shear.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 16:52:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mokshin",
"Anatolii",
"",
"LPMCN"
],
[
"Barrat",
"J. -L.",
"",
"LPMCN"
]
] | [
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] |
802.1276 | Galina L. Klimchitskaya | G.L. Klimchitskaya, E.V. Blagov and V.M. Mostepanenko | Van der Waals and Casimir interactions between atoms and carbon
nanotubes | 9 pages, 2 figures, Proceedings of QFEXT07, to appear in J. Phys. A | J. Phys. A: Math. Theor, v.41, N16, p.164012 -(1-8), 2008. | 10.1088/1751-8113/41/16/164012 | null | cond-mat.stat-mech cond-mat.other quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The van der Waals and Casimir interactions of a hydrogen atom (molecule) with
a single-walled and a multiwalled carbon nanotubes are compared. It is shown
that the macroscopic concept of graphite dielectric permittivity is already
applicable for nanotubes with only two or three walls. The absorption of
hydrogen atoms by a nanotube at separations below one nanometer is considered.
The lateral force due to exchange repulsion moves the atom to a position above
the cell center, where it is absorbed by the nanotube because the repulsive
force cannot balance the van der Waals attraction.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 16:58:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Klimchitskaya",
"G. L.",
""
],
[
"Blagov",
"E. V.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] | [
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802.1277 | Erhan Iltan | E. Iltan | Lepton flavor violating Z boson decays induced by scalar unparticle | 15 pages, 5 figures, 1 table | Eur.Phys.J.C56:113-118,2008 | 10.1140/epjc/s10052-008-0644-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We predict the branching ratios of the lepton flavor violating Z boson decays
Z\to e^{\pm} \mu^{\pm}, Z\to e^{\pm} \tau^{\pm} and Z\to \mu^{\pm} \tau^{\pm}
in the case that the lepton flavor violation is carried by the scalar
unparticle mediation. We observe that their BRs are strongly sensitive to the
unparticle scaling dimension and the branching ratios can reach to the values
of the order of 10^{-8}, for the heavy lepton flavor case, for the small values
of the scaling dimension.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 17:01:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Iltan",
"E.",
""
]
] | [
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802.1278 | Titarchuk Lev | Lev Titarchuk (GMU/NRL/GSFC) and Nikolai Shaposhnikov (GSFC/USRA) | On the nature of the variability power decay towards soft spectral
states in X-ray binaries. Case study in Cyg X-1 | 15 page, 5 figures, accepted for publication in the Astrophysical
Journal | null | 10.1086/587124 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A characteristic feature of the Fourier Power Density Spectrum (PDS) observed
from black hole X-ray binaries in low/hard and intermediate spectral states is
a broad band-limited noise, characterized by a constant below some frequency (a
``break'' frequency) and a power law above this frequency. It has been shown
that the variability of this type can be produced by the inward diffusion of
the local driving perturbations in a bounded configuration (accretion disk or
corona). In the framework of this model, the perturbation diffusion time t_0 is
related to the phenomenological break frequency, while the PDS power-law slope
above the ``break'' is determined by the viscosity distribution over the
configuration. he perturbation diffusion scenario explains the decay of the
power of X-ray variability observed in a number of compact sources (containing
black hole and neutron star) during an evolution of theses sources from
low/hard to high/soft states. We compare the model predictions with the subset
of data from Cyg X-1 collected by the Rossi X-ray Time Explorer (RXTE). Our
extensive analysis of the Cyg X-1 PDSs demonstrates that the observed
integrated power P_x decreases approximately as a square root of the
characteristic frequency of the driving oscillations \nu_{dr}. The RXTE
observations of Cyg X-1 allow us to infer P_{dr} and t_0 as a function of
\nu_{dr}. Using the inferred dependences of the integrated power of the driving
oscillations P_{dr} and t_0 on \nu_{dr} we demonstrate that the power predicted
by the model also decays as P_{x,diff} proportional to \nu_{dr}^{-0.5} that is
similar to the observed P_{x} behavior.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 17:46:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Titarchuk",
"Lev",
"",
"GMU/NRL/GSFC"
],
[
"Shaposhnikov",
"Nikolai",
"",
"GSFC/USRA"
]
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] |
802.1279 | Viviana Ene | Viviana Ene, Anda Olteanu, Loredana Sorrenti | Properties of lexsegment ideals | null | null | null | null | math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that any lexsegment ideal with linear resolution has linear quotients
with respect to a suitable ordering of its minimal monomial generators. For
completely lexsegment ideals with linear resolution we show that the
decomposition function is regular. For arbitrary lexsegment ideals we compute
the depth and the dimension. As application we characterize the Cohen-Macaulay
lexsegment ideals.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 17:52:28 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Ene",
"Viviana",
""
],
[
"Olteanu",
"Anda",
""
],
[
"Sorrenti",
"Loredana",
""
]
] | [
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] |
802.128 | Kelly Patton | Kelly R. Patton | On the shot-noise limit of a thermal current | 4 pages, 1 figure | null | 10.1088/0953-8984/20/28/285213 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The noise power spectral density of a thermal current between two macroscopic
dielectric bodies held at different temperatures and connected only at a
quantum point contact is calculated. Assuming the thermal energy is carried
only by phonons, we model the quantum point contact as a mechanical link,
having a harmonic spring potential. In the weak coupling, or weak-link limit,
we find the thermal current analog of the well-known electronic shot-noise
expression.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 17:58:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Patton",
"Kelly R.",
""
]
] | [
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] |
802.1281 | Igor Cialenco | Marius Marinel Stanescu, Igor Cialenco | Absence of eigenvalues for integro-differential operators with periodic
coefficients | null | null | null | null | math.SP math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Applying perturbation theory methods, the absence of the point spectrum for
some nonselfadjoint integro-differential operators is investigated. The
considered differential operators are of arbitrary order and act in either
$\mathbf{L}_{p}(\mathbb{R}_{+})$ or $\mathbf{L}_{p}(\mathbb{R}) (1\leq
p<\infty)$. As an application of general results, new spectral properties of
the perturbed Hill operator are derived.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 19:03:24 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Stanescu",
"Marius Marinel",
""
],
[
"Cialenco",
"Igor",
""
]
] | [
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] |
802.1282 | Michael Goff | Michael Goff | On the multiplicity conjecture for non-Cohen-Macaulay simplicial
complexes | null | null | null | null | math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a reformulation of the multiplicity upper bound conjecture and use
that reformulation to prove it for three-dimensional simplicial complexes and
homology manifolds with many vertices. We provide necessary conditions for a
Cohen-Macaulay complex with many vertices to have a pure minimal free
resolution and a characterization of flag complexes whose minimal free
resolution is pure.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 19:19:00 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Goff",
"Michael",
""
]
] | [
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] |
802.1283 | Frederik Witt | Damien Gayet, Frederik Witt | Deformations of associative submanifolds with boundary | 19 pages | Adv. Math. 226 (2011), 2351-2370 | 10.1016/j.aim.2010.09.014 | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $M$ be a topological $G_2$-manifold. We prove that the space of
infinitesimal associative deformations of a compact associative submanifold $Y$
with boundary in a coassociative submanifold $X$ is the solution space of an
elliptic problem. For a connected boundary $\partial Y$ of genus $g$, the index
is given by $\int_{\partial Y}c_1(\nu_X)+1-g$, where $\nu_X$ denotes the
orthogonal complement of $T\partial Y$ in $TX_{|\partial Y}$ and $c_1(\nu_X)$
the first Chern class of $\nu_X$ with respect to its natural complex structure.
Further, we exhibit explicit examples of non-trivial index.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 19:48:51 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 12:09:12 GMT"
},
{
"version": "v3",
"created": "Mon, 1 Nov 2010 19:40:36 GMT"
},
{
"version": "v4",
"created": "Tue, 2 Nov 2010 16:25:23 GMT"
}
] | 2010-12-30T00:00:00 | [
[
"Gayet",
"Damien",
""
],
[
"Witt",
"Frederik",
""
]
] | [
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802.1284 | Bin Jiang | Bin Jiang | Street Hierarchies: A Minority of Streets Account for a Majority of
Traffic Flow | 15 pages, 10 figures, 4 tables, submitted to Int. J. of Geographic
Information Science | International Journal of Geographical Information Science, 23(8),
1033-1048, 2009 | 10.1080/13658810802004648 | null | physics.data-an physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Urban streets are hierarchically organized in the sense that a majority of
streets are trivial, while a minority of streets is vital. This hierarchy can
be simply, but elegantly, characterized by the 80/20 principle, i.e. 80 percent
of streets are less connected (below the average), while 20 percent of streets
are well connected (above the average); out of the 20 percent, there is 1
percent of streets that are extremely well connected. This paper, using a
European city as an example, examined, at a much more detailed level, such
street hierarchies from the perspective of geometric and topological
properties. Based on an empirical study, we further proved a previous
conjecture that a minority of streets accounts for a majority of traffic flow;
more accurately, the 20 percent of top streets accommodate 80 percent of
traffic flow (20/80), and the 1 percent of top streets account for more than 20
percent of traffic flow (1/20). Our study provides new evidence as to how a
city is (self-)organized, contributing to the understanding of cities and their
evolution using increasingly available mobility geographic information.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 19:51:20 GMT"
}
] | 2009-09-15T00:00:00 | [
[
"Jiang",
"Bin",
""
]
] | [
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] |
802.1285 | Hans Fogedby | Hans C. Fogedby | Patterns in the Kardar-Parisi-Zhang equation | 8 pages revtex, 4 eps figures | null | 10.1007/s12043-008-0158-1 | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review a recent asymptotic weak noise approach to the Kardar-Parisi-Zhang
equation for the kinetic growth of an interface in higher dimensions. The weak
noise approach provides a many body picture of a growing interface in terms of
a network of localized growth modes. Scaling in 1d is associated with a gapless
domain wall mode. The method also provides an independent argument for the
existence of an upper critical dimension.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 19:59:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fogedby",
"Hans C.",
""
]
] | [
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] |
802.1286 | Tadafumi Ohsaku | Tadafumi Ohsaku | Dynamical Mass Generations and Collective Excitations in the
(Supersymmetric-)Nambu$-$Jona-Lasinio Model and a Gauge Theory with
Left-Right-Asymmetric Majorana Mass Terms | 98 pages, mathematical aspects enlarged | null | null | null | hep-ph hep-th math-ph math.MP math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The structure of effective potential surface of the Nambu$-$Jona-Lasinio
(NJL) model with right-left asymmetric Majorana mass terms (corresponds to the
single-flavor type-II seesaw situation of neutrino) is investigated. After the
dynamical generation of Dirac mass, two collective modes appear similar to the
case of ordinary NJL model, and the phase mode (phason), which corresponds to
majoron or pion at vanishing Majorana mass parameter(s), has an excitation
mass. The mechanism of generation of phason as a pseudo Nambu-Goldstone boson
is examined by a mathematical manner, summarized into a theorem
(claims as the generalized Nambu-Goldstone theorem). The mass of phason is
also evaluated in a supersymmetric version of the NJL-type model, and phason
mass takes the order of that of axion commonly accepted today. An
$SU(2_{c})$-gauge model is constructed for the context of neutrino seesaw
mechanism, and the Schwinger-Dyson equation of dynamical mass functions is
examined. Several physical implications such as decay modes of phason, a
non-linear sigma model for phason are given. It is proposed that the
method/result of this paper can be applied to an understanding on the origin of
the Kobayashi-Maskawa matrix.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 20:03:25 GMT"
},
{
"version": "v10",
"created": "Fri, 10 Dec 2010 15:01:24 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Apr 2008 21:15:26 GMT"
},
{
"version": "v3",
"created": "Thu, 9 Oct 2008 16:30:54 GMT"
},
{
"version": "v4",
"created": "Wed, 25 Mar 2009 23:36:29 GMT"
},
{
"version": "v5",
"created": "Thu, 28 May 2009 21:29:42 GMT"
},
{
"version": "v6",
"created": "Mon, 17 Aug 2009 12:40:48 GMT"
},
{
"version": "v7",
"created": "Wed, 9 Sep 2009 14:28:22 GMT"
},
{
"version": "v8",
"created": "Mon, 26 Apr 2010 15:02:04 GMT"
},
{
"version": "v9",
"created": "Fri, 16 Jul 2010 16:53:21 GMT"
}
] | 2010-12-21T00:00:00 | [
[
"Ohsaku",
"Tadafumi",
""
]
] | [
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] |
802.1287 | Atul Narang | J. T. Noel, S. S. Pilyugin, Atul Narang | The diffusive influx and carrier efflux have a strong effect on the
bistability of the lac operon in Escherichia coli | 38 pages, 20 figures | null | null | null | q-bio.MN q-bio.CB | null | In the presence of gratuitous inducers, the lac operon of Escherichia coli
exhibits bistability. Most models in the literature assume that the inducer
enters the cell via the carrier (permease), and exits by a diffusion-like
process. The diffusive influx and carrier efflux are neglected. However,
analysis of the data shows that in non-induced cells, the diffusive influx is
comparable to the carrier influx, and in induced cells, the carrier efflux is 7
times the diffusive efflux. Since bistability entails the coexistence of steady
states corresponding to both non-induced and induced cells, neither one of
these fluxes can be ignored. Here, we formulate a model accounting for both
fluxes. We show that: (a) The thresholds of bistability are profoundly affected
by both fluxes. The diffusive influx reduces the on threshold by enhancing
inducer accumulation in non-induced cells. The carrier efflux increases the off
threshold by decreasing inducer accumulation in induced cells. (b) Simulations
of the model with experimentally measured parameter values are in good
agreement with the data for IPTG. However, there are discrepancies with respect
to the data for TMG. They are most likely due to two features missing from the
model, namely, the variation of the inducer exclusion effect and the specific
growth rate with the lactose enzyme levels. (c) The steady states and
thresholds obtained in the presence of both fluxes are well approximated by
simple analytical expressions, which may be useful for the preliminary design
of the lac genetic switch in synthetic biology.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 20:22:45 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Noel",
"J. T.",
""
],
[
"Pilyugin",
"S. S.",
""
],
[
"Narang",
"Atul",
""
]
] | [
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] |
802.1288 | Alberto Ohashi | Alberto Ohashi | Fractional term structure models: No-arbitrage and consistency | Published in at http://dx.doi.org/10.1214/08-AAP586 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2009, Vol. 19, No. 4, 1553-1580 | 10.1214/08-AAP586 | IMS-AAP-AAP586 | q-fin.PR math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we introduce Heath-Jarrow-Morton (HJM) interest rate models
driven by fractional Brownian motions. By using support arguments we prove that
the resulting model is arbitrage free under proportional transaction costs in
the same spirit of Guasoni [Math. Finance 16 (2006) 569-582]. In particular, we
obtain a drift condition which is similar in nature to the classical HJM
no-arbitrage drift restriction. The second part of this paper deals with
consistency problems related to the fractional HJM dynamics. We give a fairly
complete characterization of finite-dimensional invariant manifolds for HJM
models with fractional Brownian motion by means of Nagumo-type conditions. As
an application, we investigate consistency of Nelson-Siegel family with respect
to Ho-Lee and Hull-White models. It turns out that similar to the Brownian case
such a family does not go well with the fractional HJM dynamics with
deterministic volatility. In fact, there is no nontrivial fractional interest
rate model consistent with the Nelson-Siegel family.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 20:09:37 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Dec 2008 22:43:14 GMT"
},
{
"version": "v3",
"created": "Wed, 9 Sep 2009 07:14:45 GMT"
}
] | 2009-09-09T00:00:00 | [
[
"Ohashi",
"Alberto",
""
]
] | [
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802.1289 | Mari\'an Koles\'ar | M.Kolesar, J.Novotny | Pi-eta scattering and the resummation of vacuum fluctuation in
three-flavour ChPT | Version submitted to EPJ C | Eur.Phys.J.C56:231-266,2008 | 10.1140/epjc/s10052-008-0645-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss various aspects of resummed chiral perturbation theory, which was
developed recently in order to consistently include the possibility of large
vacuum fluctuations of the ss-pairs and the scenario with smaller value of the
chiral condensate for N_f=3. The subtleties of this approach are illustrated
using a concrete example of observables connected with pi-eta scattering. This
process seems to be a suitable theoretical laboratory for this purpose due to
its sensitivity to the values of the O(p^4) LEC's, namely to the values of the
fluctuation parameters L4 and L6. We discuss several issues in detail, namely
the choice of `good' observables and properties of their bare expansions, the
`safe' reparametrization in terms of physical observables, the implementation
of exact perturbative unitarity and exact renormalization scale independence,
the role of higher order remainders and their estimates. We make a detailed
comparison with standard chiral perturbation theory and use generalized ChPT as
well as resonance chiral theory to estimate the higher order remainders.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 20:23:29 GMT"
},
{
"version": "v2",
"created": "Mon, 5 Sep 2011 09:45:48 GMT"
}
] | 2011-09-06T00:00:00 | [
[
"Kolesar",
"M.",
""
],
[
"Novotny",
"J.",
""
]
] | [
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] |
802.129 | Mohamed Anber | Mohamed M. Anber, David Kastor | C-Functions in Lovelock Gravity | 17 pages, 3 figures, v2-references added, few comments added | JHEP0805:061,2008 | 10.1088/1126-6708/2008/05/061 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present C-functions for static and spherically symmetric spacetimes in
Lovelock gravity theories. These functions are monotonically increasing
functions of the outward radial coordinate and acquire their minima when
evaluated on the horizon. Unlike the case of Einstein gravity, where there is a
single C-function, we find that this function is non-unique in the case of
Lovelock gravity. We define two C-functions, which agree at the horizon giving
the black hole entropy, and state the different energy conditions that must
hold in order for these functions to satisfy the monotonicity condition.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 21:05:14 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Mar 2008 15:50:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Anber",
"Mohamed M.",
""
],
[
"Kastor",
"David",
""
]
] | [
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] |
802.1291 | Enrique Vazquez-Semadeni | Enrique Vazquez-Semadeni, Javier Ballesteros-Paredes, Ralf S. Klessen,
A. Katharina Jappsen | Massive Star Forming Regions: Turbulent Support or Global Collapse? | 7 pages, 4 figures. To appear in the proceedings of "Massive Star
Formation: Observations confront Theory", ASP Conference Series, ed: H.
Beuther et al | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present preliminary numerical evidence that the physical conditions in
high-mass star forming regions can arise from global gravitational infall, with
the velocity dispersions being caused primarily by infall motions rather than
random turbulence. To this end, we study the clumps and cores appearing in the
region of central collapse in a numerical simulation of the formation,
evolution, and subsequent collapse of a dense cloud out of a transonic
compression in the diffuse atomic ISM. The clumps have sizes $\sim 1$ pc,
masses of several hundred $M_\odot$, and three-dimensional velocity dispersions
$\sim 3$ km s$^{-1}$, in agreement with typical observed values for such
structures. The clumps break down into massive cores of sizes $\sim 0.1$ pc,
densities $\sim 10^5$, masses 2-300 $M_\odot$, with distributions of these
quantities that peak at the same values as the massive core sample in a recent
survey of the Cygnus X molecular cloud complex. Although preliminary, these
results suggest that high-mass star forming clumps may be in a state of global
gravitational collapse rather than in equilibrium supported by strong
turbulence.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 22:21:39 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Vazquez-Semadeni",
"Enrique",
""
],
[
"Ballesteros-Paredes",
"Javier",
""
],
[
"Klessen",
"Ralf S.",
""
],
[
"Jappsen",
"A. Katharina",
""
]
] | [
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802.1292 | Fakhar ul Inam | Y. Pan, F. Inam, M. Zhang and D. A. Drabold | Atomistic Origin of Urbach Tails in Amorphous Silicon | 4 pages, 4 figures, submitted to Phys. Rev. Lett | null | 10.1103/PhysRevLett.100.206403 | null | cond-mat.dis-nn cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exponential band edges have been observed in a variety of materials, both
crystalline and amorphous. In this paper, we infer the structural origins of
these tails in amorphous and defective crystalline Si by direct calculation
with current {\it ab initio} methods. We find that exponential tails appear in
relaxed models of diamond with suitable point defects. In amorphous silicon
(a-Si), we find that structural filaments of short bonds and long bonds exist
in the network, and that the tail states near the extreme edges of both band
tails are are also filamentary, with much localization on the structural
filaments. We connect the existence of both filament systems to structural
relaxation in the presence of defects and or topological disorder.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 00:21:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pan",
"Y.",
""
],
[
"Inam",
"F.",
""
],
[
"Zhang",
"M.",
""
],
[
"Drabold",
"D. A.",
""
]
] | [
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] |
802.1293 | Hansheng Diao | Hansheng Diao | A poset structure on quasifibonacci partitions | 16 pages, 6 figures | null | null | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study partitions of positive integers into distinct
quasifibonacci numbers. A digraph and poset structure is constructed on the set
of such partitions. Furthermore, we discuss the symmetric and recursive
relations between these posets. Finally, we prove a strong generalization of
Robbins' result on the coefficients of a quasifibonacci power series.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 00:36:56 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Diao",
"Hansheng",
""
]
] | [
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] |
802.1294 | Paul Frampton | Irina Aref'eva, Paul H. Frampton and Shinya Matsuzaki | Multifluid Models for Cyclic Cosmology | 6 pages latex. Additional reference | Proc.Steklov Inst.Math.265:59-62,2009 | null | null | hep-th astro-ph gr-qc hep-ph | null | Inspired by the Landau two-fluid model of superfluidity, we consider a
similar multifluid description for cosmology where two normal fluids occur for
matter and radiation respectively. For cyclic cosmology, two dark energy
superfluid components turn out to be insufficient but three superfluids can
lead to a sensible five-fluid model which in a certain limit becomes
indistinguishable from the brane-world cyclic model proposed earlier (Baum and
Frampton). Distinguishing more general five-fluid models from brane-world
models for cyclic cosmology could be feasible with more accurate observational
data.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:21:01 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Apr 2008 00:38:30 GMT"
}
] | 2009-10-02T00:00:00 | [
[
"Aref'eva",
"Irina",
""
],
[
"Frampton",
"Paul H.",
""
],
[
"Matsuzaki",
"Shinya",
""
]
] | [
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] |
802.1295 | Hong Huang | Hong Huang | The advanced maximum principle for parabolic systems on manifolds with
boundary | 4 pages, the main result is generalized | null | null | null | math.DG math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short note we extend Chow and Lu's advanced maximum principles for
parabolic systems on closed manifolds to the case of compact manifolds with
boundary, which also generalizes a Hopf type theorem of Pulemotov.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 01:07:35 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 09:05:47 GMT"
},
{
"version": "v3",
"created": "Wed, 20 Feb 2008 07:25:01 GMT"
},
{
"version": "v4",
"created": "Sat, 23 Feb 2008 09:22:47 GMT"
}
] | 2008-02-23T00:00:00 | [
[
"Huang",
"Hong",
""
]
] | [
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] |
802.1296 | Dusko Pavlovic | Dusko Pavlovic | On quantum statistics in data analysis | 7 pages, Quantum Interaction 2008 (Oxford, April 2008) v3: added two
diagrams, changed some wordings | null | null | null | cs.IR math.CT quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Originally, quantum probability theory was developed to analyze statistical
phenomena in quantum systems, where classical probability theory does not
apply, because the lattice of measurable sets is not necessarily distributive.
On the other hand, it is well known that the lattices of concepts, that arise
in data analysis, are in general also non-distributive, albeit for completely
different reasons. In his recent book, van Rijsbergen argues that many of the
logical tools developed for quantum systems are also suitable for applications
in information retrieval. I explore the mathematical support for this idea on
an abstract vector space model, covering several forms of data analysis
(information retrieval, data mining, collaborative filtering, formal concept
analysis...), and roughly based on an idea from categorical quantum mechanics.
It turns out that quantum (i.e., noncommutative) probability distributions
arise already in this rudimentary mathematical framework. We show that a
Bell-type inequality must be satisfied by the standard similarity measures, if
they are used for preference predictions. The fact that already a very general,
abstract version of the vector space model yields simple counterexamples for
such inequalities seems to be an indicator of a genuine need for quantum
statistics in data analysis.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 01:42:31 GMT"
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"version": "v2",
"created": "Fri, 22 Feb 2008 12:08:53 GMT"
},
{
"version": "v3",
"created": "Tue, 13 May 2008 18:46:10 GMT"
}
] | 2009-04-18T00:00:00 | [
[
"Pavlovic",
"Dusko",
""
]
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] |
802.1297 | Qing-Hu Chen | Qing-Hu Chen | Dynamics of vortex glass phase in strongly type II superconductors | 6 pages, 5 figures | Phys. Rev. B78, 104501(2008) | 10.1103/PhysRevB.78.104501 | null | cond-mat.supr-con cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamics of vortices in strongly type-II superconductors with strong disorder
is investigated within the frustrated three-dimensional XY model. For two
typical models in [Phys. Rev. Lett. {\bf 91}, 077002 (2003)] and [Phys. Rev. B
{\bf 68}, 220502(R) (2003)], a strong evidence for the finite temperature
vortex glass transition in the unscreened limit is provided by performing
large-scale dynamical simulations. The obtained correlation length exponents
and the dynamic exponents in both models are different from each other and from
those in the three-dimensional gauge glass model. In addition, a genuine
continuous depinning transition is observed at zero temperature for both
models. A scaling analysis for the thermal rounding of the depinning transition
shows a non-Arrhenius type creep motion in the vortex glass phase, contrarily
to the recent studies..
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 01:45:51 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Oct 2008 07:42:39 GMT"
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] | 2009-11-13T00:00:00 | [
[
"Chen",
"Qing-Hu",
""
]
] | [
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802.1298 | Gao Changjun | Changjun Gao, Xuelei Chen, Valerio Faraoni, You-Gen Shen | Does the mass of a black hole decrease due to the accretion of phantom
energy | 12 pages, 5 figures. PRD accepted | Phys.Rev.D78:024008,2008 | 10.1103/PhysRevD.78.024008 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to Babichev et al., the accretion of a phantom test fluid onto a
Schwarzschild black hole will induce the mass of the black hole to decrease,
however the backreaction was ignored in their calculation. Using new exact
solutions describing black holes in a background Friedmann-Robertson-Walker
universe, we find that the physical black hole mass may instead increase due to
the accretion of phantom energy. If this is the case, and the future universe
is dominated by phantom dark energy, the black hole apparent horizon and the
cosmic apparent horizon will eventually coincide and, after that, the black
hole singularity will become naked in finite comoving time before the Big Rip
occurs, violating the Cosmic Censorship Conjecture.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 01:46:47 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jun 2008 01:46:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gao",
"Changjun",
""
],
[
"Chen",
"Xuelei",
""
],
[
"Faraoni",
"Valerio",
""
],
[
"Shen",
"You-Gen",
""
]
] | [
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802.1299 | LuXin Liu | Lu-Xin Liu | Nonlinear Realization of N=2 Superconformal Symmetry and Brane Effective
Actions | 22 pages, more references and comments are added | Eur.Phys.J.C62:615-623,2009 | 10.1140/epjc/s10052-009-1049-4 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Due to the incompatibility of the nonlinear realization of superconformal
symmetry and dilatation symmetry with the dilaton as the compensator field, in
the present paper it shows an alternative mechanism of spontaneous breaking the
N=2 superconformal symmetry to the N=0 case. By using the approach of nonlinear
transformations it is found that it leads to a space-filling brane theory with
Weyl scale W(1,3) symmetry. The dynamics of the resulting Weyl scale invariant
brane, along with that of other Nambu-Goldstone fields, is derived in terms of
the building blocks of the vierbein and the covariant derivative from the
Maurer-Cartan oneforms. A general coupling of the matter fields localized on
the brane world volume to these NG fields is also constructed.
| [
{
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{
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802.13 | Brian Puchala | B. Puchala, M. L. Falk, K. Garikipati | Elastic effects on relaxation volume tensor calculations | 31 pages, 6 figures, submitted to Phys. Rev. B | null | 10.1103/PhysRevB.77.174116 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relaxation volume tensors quantify the effect of stress on diffusion of
crystal defects. Continuum linear elasticity predicts that calculations of
these parameters using periodic boundary conditions do not suffer from
systematic deviations due to elastic image effects and should be independent of
supercell size or symmetry. In practice, however, calculations of formation
volume tensors of the <110> interstitial in Stillinger-Weber silicon
demonstrate that changes in bonding at the defect affect the elastic moduli and
result in system-size dependent relaxation volumes. These vary with the inverse
of the system size. Knowing the rate of convergence permits accurate estimates
of these quantities from modestly sized calculations. Furthermore, within the
continuum linear elasticity assumptions the average stress can be used to
estimate the relaxation volume tensor from constant volume calculations.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:44:56 GMT"
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] | 2009-11-13T00:00:00 | [
[
"Puchala",
"B.",
""
],
[
"Falk",
"M. L.",
""
],
[
"Garikipati",
"K.",
""
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802.1301 | Noam D. Elkies | Noam D. Elkies | Shimura curve computations via K3 surfaces of Neron-Severi rank at least
19 | 16 pages (1 figure drawn with the LaTeX picture environment); To
appear in the proceedings of ANTS-VIII, Banff, May 2008 | null | null | null | math.NT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that K3 surfaces S whose Picard number rho (= rank of the
Neron-Severi group of S) is at least 19 are parametrized by modular curves X,
and these modular curves X include various Shimura modular curves associated
with congruence subgroups of quaternion algebras over Q. In a family of such K3
surfaces, a surface has rho=20 if and only if it corresponds to a CM point on
X. We use this to compute equations for Shimura curves, natural maps between
them, and CM coordinates well beyond what could be done by working with the
curves directly as we did in ``Shimura Curve Computations'' (1998) =
<http://arxiv.org/abs/math/0005160>
| [
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"created": "Sun, 10 Feb 2008 04:05:37 GMT"
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802.1302 | Tetsuya Nakajima | Tetsuya Nakajima and Koji Hukushima | Large Deviation Property of Free Energy in p-Body
Sherrington-Kirkpatrick Model | 7 pages, 5 figures. accepted for publication in J.Phs.Soc.Jpn | null | 10.1143/JPSJ.77.074718 | null | cond-mat.dis-nn cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cumulant generating function phi(n) and rate function Sigma(f) of the free
energy is evaluated in p-body Sherrington-Kirkpatrick model by using the
replica method with the replica number n finite. From a perturbational
argument, we show that the cumulant generating function is constant in the
vicinity of n = 0. On the other hand, with the help of two analytic properties
of phi(n), the behavior of phi(n) is derived again. However this is also shown
to be broken at a finite value of n, which gives a characteristic value in the
rate function near the thermodynamic value of the free energy. Through the
continuation of phi(n) as a function of n, we find out a way to derive the 1RSB
solution at least in this model, which is to fix the RS solution to be a
monotone increasing function.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 04:54:26 GMT"
},
{
"version": "v2",
"created": "Wed, 21 May 2008 08:47:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nakajima",
"Tetsuya",
""
],
[
"Hukushima",
"Koji",
""
]
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