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802.0403 | Stefan L\"ammer | Stefan L\"ammer and Dirk Helbing | Self-Control of Traffic Lights and Vehicle Flows in Urban Road Networks | null | null | 10.1088/1742-5468/2008/04/P04019 | null | physics.soc-ph physics.flu-dyn | null | Based on fluid-dynamic and many-particle (car-following) simulations of
traffic flows in (urban) networks, we study the problem of coordinating
incompatible traffic flows at intersections. Inspired by the observation of
self-organized oscillations of pedestrian flows at bottlenecks [D. Helbing and
P. Moln\'ar, Phys. Eev. E 51 (1995) 4282--4286], we propose a self-organization
approach to traffic light control. The problem can be treated as multi-agent
problem with interactions between vehicles and traffic lights. Specifically,
our approach assumes a priority-based control of traffic lights by the vehicle
flows themselves, taking into account short-sighted anticipation of vehicle
flows and platoons. The considered local interactions lead to emergent
coordination patterns such as ``green waves'' and achieve an efficient,
decentralized traffic light control. While the proposed self-control adapts
flexibly to local flow conditions and often leads to non-cyclical switching
patterns with changing service sequences of different traffic flows, an almost
periodic service may evolve under certain conditions and suggests the existence
of a spontaneous synchronization of traffic lights despite the varying delays
due to variable vehicle queues and travel times. The self-organized traffic
light control is based on an optimization and a stabilization rule, each of
which performs poorly at high utilizations of the road network, while their
proper combination reaches a superior performance. The result is a considerable
reduction not only in the average travel times, but also of their variation.
Similar control approaches could be applied to the coordination of logistic and
production processes.
| [
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"version": "v1",
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},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 07:59:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lämmer",
"Stefan",
""
],
[
"Helbing",
"Dirk",
""
]
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802.0404 | Jeremy Shears | Jeremy Shears, David Boyd, Steve Brady, Roger Pickard | The orbital period of the eclipsing dwarf nova CG Draconis | 12 pages, 8 figures, accepted for publication in the Journal of the
British Astronomical Association | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have performed time resolved photometry on the dwarf nova CG Dra and have
established for the first time that it is an eclipsing system. By measuring the
times of the eclipses, we determined the orbital period as 0.18864(4) d, or 4h
31m 38 +/- 3s. This value is consistent with the shorter of two periods
proposed from earlier spectroscopic studies. The orbital period places CG Dra
above the period gap. The symmetrical eclipses are of short duration (FWHM
18+/-2 min, or 0.066(7) of the orbital period) and shallow (average 0.16+/-0.02
mag), suggesting a grazing eclipse which is consistent with an orbital
inclination just above the critical value. Flickering persists through the
eclipse which means that the flickering source is not occulted by the secondary
star.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 13:04:47 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Shears",
"Jeremy",
""
],
[
"Boyd",
"David",
""
],
[
"Brady",
"Steve",
""
],
[
"Pickard",
"Roger",
""
]
] | [
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802.0405 | Tetsuya Hosaka | Tetsuya Hosaka | CAT(0) groups and Coxeter groups whose boundaries are scrambled sets | 28 pages | null | null | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study CAT(0) groups and Coxeter groups whose boundaries are
scrambled sets. Suppose that a group $G$ acts geometrically (i.e. properly and
cocompactly by isometries) on a CAT(0) space $X$. (Such group $G$ is called a
{\it CAT(0) group}.) Then the group $G$ acts by homeomorphisms on the boundary
$\partial X$ of $X$ and we can define a metric $d_{\partial X}$ on the boundary
$\partial X$. The boundary $\partial X$ is called a {\it scrambled set} if for
any $\alpha,\beta\in\partial X$ with $\alpha\neq\beta$, (1)
$\limsup\{d_{\partial X}(g\alpha,g\beta) | g\in G\}>0$ and (2)
$\liminf\{d_{\partial X}(g\alpha,g\beta) | g\in G\}=0$. We investigate when are
boundaries of CAT(0) groups (and Coxeter groups) scrambled sets.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 13:07:44 GMT"
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] | 2008-02-05T00:00:00 | [
[
"Hosaka",
"Tetsuya",
""
]
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802.0406 | S\'ilvio Duarte Queir\'os M. | Silvio M. Duarte Queiros | On the role of ergodicity and mixing in the central limit theorem for
Casati-Prosen triangle map variables | 14 pages. To appear in Physics Letters A | Phys. Lett. A 373, 1514-1518 (2009) | 10.1016/j.physleta.2009.02.055 | null | cond-mat.stat-mech nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript we analyse the behaviour of the probability density
function of the sum of $N$ deterministic variables generated from the triangle
map of Casati-Prosen. For the case in which the map is both ergodic and mixing
the resulting probability density function quickly concurs with the Normal
distribution. When these properties are modified the resulting probability
density functions are described by power-laws. Moreover, contrarily to what it
would be expected, as the number of added variables $N$ increases the distance
to Gaussian distribution increases. This behaviour goes against standard
central limit theorem. By extrapolation of our finite size results we preview
that in the limit of $N$ going to infinity the distribution has the same
asymptotic decay as a Lorenztian (or a $q=2$-Gaussian).
| [
{
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"created": "Mon, 4 Feb 2008 13:11:14 GMT"
},
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},
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"created": "Thu, 15 May 2008 10:27:30 GMT"
},
{
"version": "v4",
"created": "Mon, 23 Feb 2009 19:47:59 GMT"
}
] | 2009-03-21T00:00:00 | [
[
"Queiros",
"Silvio M. Duarte",
""
]
] | [
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802.0407 | Mikito Koshino | Mikito Koshino | Electron delocalization in bilayer graphene induced by an electric field | 6 pages, 6 figures | Phys. Rev. B 78, 155411 (2008) | 10.1103/PhysRevB.78.155411 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electronic localization is numerically studied in disordered bilayer graphene
with an electric-field induced energy gap. Bilayer graphene is a zero-gap
semiconductor, in which an energy gap can be opened and controlled by an
external electric field perpendicular to the layer plane. We found that, in the
smooth disorder potential not mixing the states in different valleys (K and K'
points), the gap opening causes a phase transition at which the electronic
localization length diverges. We show that this can be interpreted as the
integer quantum Hall transition at each single valley, even though the magnetic
field is absent.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 16:39:43 GMT"
},
{
"version": "v2",
"created": "Fri, 16 Jan 2009 00:37:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Koshino",
"Mikito",
""
]
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802.0408 | Johannes Bluemlein | Johannes Bl\"umlein and Helmut B\"ottcher | Higher Twist Contributions to the Structure Functions F_2^p(x,Q^2) and
F_2^d(x,Q^2) at Large x and Higher Orders | 7 pages, 1 style file, 2 figures | Phys.Lett.B662:336-340,2008 | 10.1016/j.physletb.2008.03.026 | DESY 07-227, SFB-CPP-08-12 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The higher twist contributions to the deeply inelastic structure functions
$F_2^{p}(x,Q^2)$ and $F_2^{d}(x,Q^2)$ for larger values of the Bjorken variable
$x$ are extracted extrapolating the {twist--2} contributions measured in the
large $W^2$ region to the region $4 \GeV^2 \leq W^2 \leq 12.5 \GeV^2$ applying
target mass corrections. We compare the results for the NLO, NNLO and N$^3$LO
analyzes and include also the large $x$ at N$^4$LO to the Wilson coefficients.
A gradual lowering of the higher twist contributions going from NLO to N$^4$LO
is observed, which stresses the importance of higher order corrections.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 13:11:42 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 19:50:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Blümlein",
"Johannes",
""
],
[
"Böttcher",
"Helmut",
""
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] |
802.0409 | Jens Wirth | Fumihiko Hirosawa and Jens Wirth | Generalised energy conservation law for the wave equations with variable
propagation speed | 23 pages, further examples and counter-examples included | J. Math. Anal. Appl. 358:56-74, 2009 | 10.1016/j.jmaa.2009.04.048 | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the long time behaviour of the $L^2$-energy of solutions to
wave equations with variable speed. The novelty of the approach is the
combination of estimates for higher order derivatives of the coefficient with a
stabilisation property.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 13:22:41 GMT"
},
{
"version": "v2",
"created": "Thu, 29 May 2008 11:39:15 GMT"
}
] | 2009-11-24T00:00:00 | [
[
"Hirosawa",
"Fumihiko",
""
],
[
"Wirth",
"Jens",
""
]
] | [
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] |
802.041 | Danny Martinez-Pedrera | Iman Benmachiche, Jan Louis and Danny Martinez-Pedrera | The effective action of the heterotic string compactified on manifolds
with SU(3) structure | 35 pages | Class.Quant.Grav.25:135006,2008 | 10.1088/0264-9381/25/13/135006 | ZMP-HH/08-2 | hep-th | null | We derive the N=1 effective action of the heterotic string compactified on
manifolds with SU(3) structure in the presence of background fluxes. We use a
Kaluza-Klein reduction and compute the moduli dependence of the Kaehler
potential, the gauge kinetic function and the superpotential entirely from
fermionic terms of the reduced action.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 13:29:04 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 20:15:51 GMT"
},
{
"version": "v3",
"created": "Mon, 3 Mar 2008 13:51:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Benmachiche",
"Iman",
""
],
[
"Louis",
"Jan",
""
],
[
"Martinez-Pedrera",
"Danny",
""
]
] | [
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] |
802.0411 | Jing-Ling Chen | Ming-Guang Hu, Dong-Ling Deng, and Jing-Ling Chen | Maximal Quantum Violation of the CGLMP Inequality on Its Both Sides | 14 pages, 2 figures. Accepted for publication in International
Journal of Quantum Information | International Journal of Quantum Information Vol 6, No. 5,
1067-1076 (2008) | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the maximal violations for both sides of the $d$-dimensional
CGLMP inequality by using the Bell operator method. It turns out that the
maximal violations have a decelerating increase as the dimension increases and
tend to a finite value at infinity. The numerical values are given out up to
$d=10^6$ for positively maximal violations and $d=2\times 10^5$ for negatively
maximal violations. Counterintuitively, the negatively maximal violations tend
to be a little stronger than the positively maximal violations. Further we show
the states corresponding to these maximal violations and compare them with the
maximally entangled states by utilizing entangled degree defined by von Neumann
entropy. It shows that their entangled degree tends to some nonmaximal value as
the dimension increases.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 13:30:09 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Sep 2008 08:23:43 GMT"
}
] | 2011-03-10T00:00:00 | [
[
"Hu",
"Ming-Guang",
""
],
[
"Deng",
"Dong-Ling",
""
],
[
"Chen",
"Jing-Ling",
""
]
] | [
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] |
802.0412 | Juan Francisco Macias-Perez | Juan Francisco Macias-Perez (LPSC), F. Mayet (LPSC), J. Aumont (LPSC),
F.X. Desert (LAOG) | Global spectral energy distribution of the Crab Nebula in the prospect
of the Planck satellite polarisation calibration | null | Astrophys.J.711:417-423,2010 | 10.1088/0004-637X/711/1/417 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whithin the framework of the Planck satellite polarisation calibration, we
present a study of the Crab Nebula spectral energy distribution (SED) over more
than 6 decades in frequency ranging from 1 to $\rm 10^6 GHz$. The Planck
satellite mission observes the sky from 30 to 857 GHz and therefore we focus on
the millimetre region. We use radio and submillimetre data from the WMAP
satellite between 23 and 94 GHz (from 13 to 3.18 mm) and from the Archeops
balloon experiment between 143 (2.1 mm) and 545 GHz (0.55 mm), and a compendium
of other Crab Nebula observations. The Crab SED is compared to models including
three main components : synchrotron which is responsible for the emission at
low and at high frequencies, dust which explains the excess of flux observed by
the IRAS satellite and an extra component on the millimetre regime. From this
analysis we conclude that the unpolarised emission of the Crab Nebula at
microwave and millimetre wavelengths is the same synchrotron emission that the
one observed in the radio domain. Therefore, we expect the millimetre emission
of the Crab nebula to be polarised with the same degree of polarisation and
orientation than the radio emission. We set upper limits on the possible errors
induced by any millimetre extra component on the reconstruction of the degree
and angle of polarisation at the percent level as a maximum. This result
strongly supports the choice by the Planck collaboration of the Crab nebula
emission for performing polarisation cross-checks in the range 30 (299 mm) to
353 GHz (0.849 mm).
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 13:54:31 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jan 2010 14:46:35 GMT"
}
] | 2010-02-17T00:00:00 | [
[
"Macias-Perez",
"Juan Francisco",
"",
"LPSC"
],
[
"Mayet",
"F.",
"",
"LPSC"
],
[
"Aumont",
"J.",
"",
"LPSC"
],
[
"Desert",
"F. X.",
"",
"LAOG"
]
] | [
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] |
802.0413 | Menno Poot | Menno Poot and Herre S. J. van der Zant | Nanomechanical properties of few-layer graphene membranes | 9 pages, 3 figures, This article has been accepted by Appl. Phys.
Lett. After it is published, it will be found at http://apl.aip.org/ | Appl. Phys. Lett. 92, 063111 (2008) | 10.1063/1.2857472 | null | cond-mat.mes-hall cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have measured the mechanical properties of few-layer graphene and graphite
flakes that are suspended over circular holes. The spatial profile of the
flake's spring constant is measured with an atomic force microscope. The
bending rigidity of and the tension in the membranes are extracted by fitting a
continuum model to the data. For flakes down to eight graphene layers, both
parameters show a strong thickness-dependence. We predict fundamental resonance
frequencies of these nanodrums in the GHz range based on the measured bending
rigidity and tension.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:01:32 GMT"
}
] | 2012-03-16T00:00:00 | [
[
"Poot",
"Menno",
""
],
[
"van der Zant",
"Herre S. J.",
""
]
] | [
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] |
802.0414 | Zeev Schuss | Doron Ezri, Ben-Tzion Bobrovsky, Zeev Schuss | The exit problem in optimal non-causal extimation | Loss of lock in nonlinear smoothers | null | null | null | math.OC cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenon of loss of lock in the optimal non-causal phase
estimation problem, a benchmark problem in nonlinear estimation. Our method is
based on the computation of the asymptotic distribution of the optimal
estimation error in case the number of trajectories in the optimization problem
is finite. The computation is based directly on the minimum noise energy
optimality criterion rather than on state equations of the error, as is the
usual case in the literature. The results include an asymptotic computation of
the mean time to lose lock (MTLL) in the optimal smoother. We show that the
MTLL in the first and second order smoothers is significantly longer than that
in the causal extended Kalman filter.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 12:12:14 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Ezri",
"Doron",
""
],
[
"Bobrovsky",
"Ben-Tzion",
""
],
[
"Schuss",
"Zeev",
""
]
] | [
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] |
802.0415 | Eric Bonnet | E. Bonnet (IPNO, Ganil), B. Borderie (IPNO), N. Le Neindre (IPNO),
M.F. Rivet (IPNO) | Comparison of fragment partitions production in peripheral and central
collisions | 7 pages, 2 figures, presented at the International Workshop on
Multifragmentation and Related Topics, Caen France, 4-7th november 2007
(IWM2007) | - International Workshop on Multifragmentation and Related Topics
(IWM2007), Caen (2007) | null | null | nucl-ex | null | Ensembles of single-source events, produced in peripheral and central
collisions and correponding respectively to quasi-projectile and quasi-fusion
sources, are analyzed. After selections on fragment kinematic properties,
excitation energies of the sources are derived using the calorimetric method
and the mean behaviour of fragments of the two ensembles are compared.
Differences observed in their partitions, especially the charge asymmetry, can
be related to collective energy deposited in the systems during the collisions.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:05:20 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Bonnet",
"E.",
"",
"IPNO, Ganil"
],
[
"Borderie",
"B.",
"",
"IPNO"
],
[
"Neindre",
"N. Le",
"",
"IPNO"
],
[
"Rivet",
"M. F.",
"",
"IPNO"
]
] | [
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] |
802.0416 | James Van Meter | John G. Baker, William D. Boggs, Joan Centrella, Bernard J. Kelly,
Sean T. McWilliams, M. Coleman Miller, James R. van Meter | Modeling kicks from the merger of generic black-hole binaries | 5 pages, 1 figure, 3 tables. Version published in Astrophys. J. Lett | Astrophys.J.682:L29-L32,2008 | 10.1086/590927 | null | astro-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent numerical relativistic results demonstrate that the merger of
comparable-mass spinning black holes has a maximum ``recoil kick'' of up to
$\sim 4000 \kms$. However the scaling of these recoil velocities with mass
ratio is poorly understood. We present new runs showing that the maximum
possible kick perpendicular to the orbital plane does not scale as $\sim\eta^2$
(where $\eta$ is the symmetric mass ratio), as previously proposed, but is more
consistent with $\sim\eta^3$, at least for systems with low orbital precession.
We discuss the effect of this dependence on galactic ejection scenarios and
retention of intermediate-mass black holes in globular clusters.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:53:35 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Jul 2008 21:13:23 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Baker",
"John G.",
""
],
[
"Boggs",
"William D.",
""
],
[
"Centrella",
"Joan",
""
],
[
"Kelly",
"Bernard J.",
""
],
[
"McWilliams",
"Sean T.",
""
],
[
"Miller",
"M. Coleman",
""
],
[
"van Meter",
"James R.",
""
]
] | [
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] |
802.0417 | Christian Gutschwager | Christian Gutschwager | On principal hook length partitions and durfee sizes in skew characters | 13 pages, minor changes from v1 to v2 as suggested by the referee, to
appear in Annals. Comb | null | 10.1007/s00026-011-0084-7 | null | math.CO math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we construct for a given arbitrary skew diagram A all
partitions nu with maximal principal hook lengths among all partitions with the
character [nu] appearing in the skew character [A]. Furthermore we show that
these are also partitions with minimal Durfee size. This we use to give the
maximal Durfee size for [nu] appearing in [A] for the cases when A decays into
two partitions and for some special cases of A. Also this gives conditions for
two skew diagrams to represent the same skew character.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:16:05 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Aug 2008 13:49:25 GMT"
}
] | 2011-03-24T00:00:00 | [
[
"Gutschwager",
"Christian",
""
]
] | [
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802.0418 | Stephan Rosswog | S. Rosswog, D.J. Price | 3D meshfree magnetohydrodynamics | 28 pages, 8 Figures; submitted to Springer Lecture Notes in
Computational Science and Engineering | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a new method to include magnetic fields into smooth particle
hydrodynamics. The derivation of the self-gravitating hydrodynamics equations
from a variational principle is discussed in some detail. The non-dissipative
magnetic field evolution is instantiated by advecting so-called Euler
potentials. This approach enforces the crucial
$\nabla\cdot\vec{B}=0$-constraint by construction. These recent developments
are implemented in our three-dimensional, self-gravitating magnetohydrodynamics
code MAGMA. A suite of tests is presented that demonstrates the superiority of
this new approach in comparison to previous implementations.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:16:46 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Rosswog",
"S.",
""
],
[
"Price",
"D. J.",
""
]
] | [
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] |
802.0419 | Yuan-Chuan Zou | Wei-Hua Lei, Ding-Xiong Wang, Yuan-Chuan Zou and Lei Zhang | Hyperaccretion after the Blandford-Znajek Process: a New Model for GRBs
with X-Ray Flares Observed in Early Afterglows | 10 pages, 2 figures. Accepted by ChJAA | null | 10.1088/1009-9271/8/4/04 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a three-stage model with Blandford-Znajek (BZ) and hyperaccretion
process to interpret the recent observations of early afterglows of Gamma-Ray
Bursts (GRBs). In the first stage, the prompt GRB is powered by a rotating
black hole (BH) invoking the BZ process. The second stage is a quiet stage, in
which the BZ process is shut off, and the accretion onto the BH is depressed by
the torque exerted by the magnetic coupling (MC) process. Part of the
rotational energy transported by the MC process from the BH is stored in the
disk as magnetic energy. In the third stage, the MC process is shut off when
the magnetic energy in the disk accumulates and triggers the magnetic
instability. At this moment, the hyperaccretion process may onset, and the jet
launched in this restarted central engine generates the observed X-ray flares.
This model can account for energies and timescales of GRBs with X-ray flares
observed in early afterglows.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:16:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lei",
"Wei-Hua",
""
],
[
"Wang",
"Ding-Xiong",
""
],
[
"Zou",
"Yuan-Chuan",
""
],
[
"Zhang",
"Lei",
""
]
] | [
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] |
802.042 | Wouter Castryck | Wouter Castryck, John Voight | On nondegeneracy of curves | null | null | null | null | math.AG math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A curve is called nondegenerate if it can be modeled by a Laurent polynomial
that is nondegenerate with respect to its Newton polytope. We show that up to
genus 4, every curve is nondegenerate. We also prove that the locus of
nondegenerate curves inside the moduli space of curves of fixed genus g > 1 is
min(2g+1,3g-3)-dimensional, except in case g=7 where it is 16-dimensional.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:17:19 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Apr 2008 11:55:58 GMT"
}
] | 2008-04-11T00:00:00 | [
[
"Castryck",
"Wouter",
""
],
[
"Voight",
"John",
""
]
] | [
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] |
802.0421 | Luciano da Fontoura Costa | Luciano da Fontoura Costa | Avalanches of Activation and Spikes in Neuronal Complex Networks | 17 pages, 20 figures | null | null | null | physics.soc-ph cond-mat.dis-nn physics.comp-ph q-bio.NC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As shown recently (arXiv:0801.3056), several types of neuronal complex
networks involving non-linear integration-and-fire dynamics exhibit an abrupt
activation along their transient regime. Interestingly, such an avalanche of
activation has also been found to depend strongly on the topology of the
networks: while the Erd\H{o}s-R\'eny, Barab\'asi-Albert, path-regular and
path-transformed BA models exhibit well-defined avalanches; Watts-Strogatz and
geographical structures present instead a gradual dispersion of activation
amongst their nodes. The current work investigates such phenomena by
considering a mean-field equivalent model of a network which is strongly
founded on the concepts of concentric neighborhoods and degrees. It is shown
that the hierarchical number of nodes and hierarchical degrees define the
intensity and timing of the avalanches. This approach also allowed the
identification of the beginning activation times during the transient dynamics,
which is particularly important for community identification (arXiv:0801.4269,
arXiv:0801.4684). The main concepts and results in this work are illustrated
with respect to theoretical and real-world (\emph{C. elegans}) networks.
Several results are reported, including the identification of secondary
avalanches, the validation of the equivalent model, the identification of the
possible universality of the avalanches for most networks (depending only on
the network size), as well as the identification of the fact that different
avalanches can be obtained by locating the activation source at different
neurons of the \emph{C. elegans} network.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:20:19 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Costa",
"Luciano da Fontoura",
""
]
] | [
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] |
802.0422 | Janine Splettstoesser | Janine Splettstoesser, Michele Governale, J\"urgen K\"onig | Adiabatic charge and spin pumping through quantum dots with
ferromagnetic leads | 9 pages, 7 figures, published in Phys. Rev. B | Phys. Rev. B 77, 195320 (2008) | 10.1103/PhysRevB.77.195320 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study adiabatic pumping of electrons through quantum dots attached to
ferromagnetic leads. Hereby we make use of a real-time diagrammatic technique
in the adiabatic limit that takes into account strong Coulomb interaction in
the dot. We analyze the degree of spin polarization of electrons pumped from a
ferromagnet through the dot to a nonmagnetic lead (N-dot-F) as well as the
dependence of the pumped charge on the relative leads' magnetization
orientations for a spin-valve (F-dot-F) structure. For the former case, we find
that, depending on the relative coupling strength to the leads, spin and charge
can, on average, be pumped in opposite directions. For the latter case, we find
an angular dependence of the pumped charge, that becomes more and more
anharmonic for large spin polarization in the leads.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:25:24 GMT"
},
{
"version": "v2",
"created": "Wed, 13 May 2009 07:18:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Splettstoesser",
"Janine",
""
],
[
"Governale",
"Michele",
""
],
[
"König",
"Jürgen",
""
]
] | [
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] |
802.0423 | Tommy F\"arnqvist | Tommy F\"arnqvist, Peter Jonsson and Johan Thapper | Approximability Distance in the Space of H-Colourability Problems | 19 pages | null | null | null | cs.CC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A graph homomorphism is a vertex map which carries edges from a source graph
to edges in a target graph. We study the approximability properties of the
Weighted Maximum H-Colourable Subgraph problem (MAX H-COL). The instances of
this problem are edge-weighted graphs G and the objective is to find a subgraph
of G that has maximal total edge weight, under the condition that the subgraph
has a homomorphism to H; note that for H=K_k this problem is equivalent to MAX
k-CUT. To this end, we introduce a metric structure on the space of graphs
which allows us to extend previously known approximability results to larger
classes of graphs. Specifically, the approximation algorithms for MAX CUT by
Goemans and Williamson and MAX k-CUT by Frieze and Jerrum can be used to yield
non-trivial approximation results for MAX H-COL. For a variety of graphs, we
show near-optimality results under the Unique Games Conjecture. We also use our
method for comparing the performance of Frieze & Jerrum's algorithm with
Hastad's approximation algorithm for general MAX 2-CSP. This comparison is, in
most cases, favourable to Frieze & Jerrum.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:32:45 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Färnqvist",
"Tommy",
""
],
[
"Jonsson",
"Peter",
""
],
[
"Thapper",
"Johan",
""
]
] | [
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-0.0850809366,
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] |
802.0424 | Emilia Morosan | E. Morosan, J. A. Fleitman, Q. Huang, J. W. Lynn, Y. Chen, X. Ke, M.
L. Dahlberg, P. Schiffer, C. R. Craley and R. J. Cava | Structure and magnetic properties of the Ho2Ge2O7 pyrogermanate | null | Phys. Rev. B 77 (2008) 224423 | 10.1103/PhysRevB.77.224423 | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report the anisotropic magnetic properties of Ho2Ge2O7 determined from dc
and ac magnetization, specific heat and powder neutron diffraction experiments.
The magnetic lanthanide sublattice, seen in our refinement of the tetragonal
pyrogermanate crystal structure, is a right-handed spiral of edge-sharing and
corner-sharing triangles; the local Ho-O coordination indicates that the
crystal field is anisotropic. Susceptibility and magnetization data indeed show
that the magnetism is highly anisotropic, and the magnetic structure has the Ho
moments confined to the plane perpendicular to the structural spiral. The
ordered moment of Ho3+, as determined from refinement of the neutron
diffraction data, is 9.0 mu_B. Magnetic ordering occurs around 1.6 K.
Temperature and field dependent ac susceptibility measurements show that this
compound displays spin relaxation phenomena analogous to what is seen in the
spin ice pyrochlore system Ho2Ti2O7.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:51:37 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Sep 2008 14:53:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Morosan",
"E.",
""
],
[
"Fleitman",
"J. A.",
""
],
[
"Huang",
"Q.",
""
],
[
"Lynn",
"J. W.",
""
],
[
"Chen",
"Y.",
""
],
[
"Ke",
"X.",
""
],
[
"Dahlberg",
"M. L.",
""
],
[
"Schiffer",
"P.",
""
],
[
"Craley",
"C. R.",
""
],
[
"Cava",
"R. J.",
""
]
] | [
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] |
802.0425 | Charisis Chatzigogos | Charisis Chatzigogos (LMS), Alain Pecker (LMS), J. Salen\c{c}on (LMS) | Macroelement modeling of shallow foundations | null | null | null | null | physics.class-ph | null | The paper presents a new macroelement model for shallow foundations. The
model is defined through a non-linear constitutive law written in terms of some
generalized force and displacement parameters. The linear part of this
constitutive law comes from the dynamic impedances of the foundation. The
non-linear part comprises two mechanisms. One is due to the irreversible
elastoplastic soil behavior: it is described with a bounding surface
hypoplastic model, adapted for the description of the cyclic soil response. An
original feature of the formulation is that the bounding surface is considered
independently of the surface of ultimate loads of the system. The second
mechanism is the detachment that can take place at the soil-footing interface
(foundation uplift). It is totally reversible and non-dissipative and can thus
be described by a phenomenological non-linear elastic model. The macroelement
is qualitatively validated by application to soil-structure interaction
analyses of simple real structures.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:52:40 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Chatzigogos",
"Charisis",
"",
"LMS"
],
[
"Pecker",
"Alain",
"",
"LMS"
],
[
"Salençon",
"J.",
"",
"LMS"
]
] | [
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] |
802.0426 | Michel Hickel | Michel Hickel (IMB) | Une note \`a propos du Jacobien de $n$ fonctions holomorphes \`a
l'origine de $\mathbb{C}^n$ | null | Annales Polonici Mathematici (2008) 1-22 | null | null | math.AG | null | Let $f_1,...,f_n$ be $n$ germs of holomorphic functions at the origin of
$\mathbb{C}^n$ such that $f_i(0)=0$, $1\leq i\leq n$. We give a proof based on
the J. Lipman's theory of residues via Hochschild Homology that the Jacobian of
$f_1,...,f_n$ belongs to the ideal generated by $f_1,...,f_n$ belongs to the
ideal generated by $f_1,...,f_n$ if and only if the dimension ot the germ of
common zeos of $f_1,...,f_n$ is sttrictly positive. In fact we prove much more
general results which are relatives versions of this result replacing the field
$\mathbb{C}$ by convenient noetherian rings $\mathbf{A}$ (c.f. Th. 3.1 and Th.
3.3). We then show a \L ojasiewicz inequality for the jacobian analogous to the
classical one by S. \L ojasiewicz for the gradient.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 14:53:34 GMT"
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] | 2008-07-03T00:00:00 | [
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"Hickel",
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] |
802.0427 | Dr. Peter S"ule | P. S\"ule | Anisotropy driven ultrafast nanocluster burrowing | 9 pages, 5 figures. submitted to Phys. Rev. B, preprint:
http://www.mfa.kfki.hu/~sule/papers/cluster.pdf | null | 10.1063/1.2969082 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the occurrence of low-energy and low-temperature transient cluster
burrowing leading to intact cluster inclusions. In particular, the anomalously
fast (ballistic) Pt nanocluster implantation into Al and Ti substrates has been
found by molecular dynamics simulations using a tight-binding many-body
potential with the 1-5 eV/atom low impact energy. Similar behavior has also
been found for many other cluster/substrate couples such as Cu/Al and Ni/Ti,
Co/Ti, etc. In particular, in Ni/Ti at already $\sim 0.5$ eV/atom impact energy
burrowing takes place. At this few eV/atom low impact energy regime instead of
the expected stopping at the surface we find the propagation of the cluster
through a thin Al slab as thick as $\sim 50$ $\hbox{\AA}$ with a nearly
constant speed ($\propto 1$ eV/atom). Hence the cluster moves far beyond the
range of the impact energy which suggests that the mechanism of cluster
burrowing can not be explained simply by collisional cascade effects. In the
couples with reversed succession (e.g. Ti/Pt, Al/Pt) no burrowing has been
found, the clusters remain on the surface (the asymmetry of burrowing). We
argue that cluster penetration occurs at few eV/atom impact energy when the
cluster/substrate interaction is size-mismatched and mass anisotropic
atomically.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 08:29:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Süle",
"P.",
""
]
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802.0428 | Philip Gressman | Philip T. Gressman | Rank and regularity for averages over submanifolds | 32 pages, 2 figures | null | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper establishes endpoint $L^p-L^q$ and Sobolev mapping properties of
Radon-like operators which satisfy a homogeneity condition (similar to
semiquasihomogeneity) and a condition on the rank of a matrix related to
rotational curvature. For highly degenerate operators, the rank condition is
generically satisfied for algebraic reasons, similar to an observation of
Greenleaf, Pramanik, and Tang concerning oscillatory integral operators.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:01:48 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Gressman",
"Philip T.",
""
]
] | [
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] |
802.0429 | Radoslaw Wojtak | Radoslaw Wojtak, Ewa L. Lokas, Gary A. Mamon, Stefan Gottloeber,
Anatoly Klypin, Yehuda Hoffman | The distribution function of dark matter in massive haloes | 16 pages, 12 figures, final version accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc. 388 (2008) 815-828 | 10.1111/j.1365-2966.2008.13441.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the distribution function (DF) of dark matter particles in haloes of
mass range 10^{14}--10^{15}\Msun. In the numerical part of this work we measure
the DF for a sample of relaxed haloes formed in the simulation of a standard
\LambdaCDM model. The DF is expressed as a function of energy E and the
absolute value of the angular momentum L, a form suitable for comparison with
theoretical models. By proper scaling we obtain the results that do not depend
on the virial mass of the haloes. We demonstrate that the DF can be separated
into energy and angular momentum components and propose a phenomenological
model of the DF in the form
f_{E}(E)[1+L^{2}/(2L_{0}^{2})]^{-\beta_{\infty}+\beta_{0}}L^{-2\beta_{0}}. This
formulation involves three parameters describing the anisotropy profile in
terms of its asymptotic values (\beta_{0} and \beta_{\infty}) and the scale of
transition between them (L_{0}). The energy part f_{E}(E) is obtained via
inversion of the integral for spatial density. We provide a straightforward
numerical scheme for this procedure as well as a simple analytical
approximation for a typical halo formed in the simulation. The DF model is
extensively compared with the simulations: using the model parameters obtained
from fitting the anisotropy profile, we recover the DF from the simulation as
well as the profiles of the dispersion and kurtosis of radial and tangential
velocities. Finally, we show that our DF model reproduces the power-law
behaviour of phase space density Q=\rho(r)/\sigma^{3}(r).
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:05:11 GMT"
},
{
"version": "v2",
"created": "Fri, 16 May 2008 13:22:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wojtak",
"Radoslaw",
""
],
[
"Lokas",
"Ewa L.",
""
],
[
"Mamon",
"Gary A.",
""
],
[
"Gottloeber",
"Stefan",
""
],
[
"Klypin",
"Anatoly",
""
],
[
"Hoffman",
"Yehuda",
""
]
] | [
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] |
802.043 | Andres Greco | M. Bejas, A. Greco, A. Muramatsu, A. Foussats | One-particle spectral properties of the t-J-$V$ model on the triangular
lattice near charge order | 11 pages, 11 figures. accepted in Phys. Rev. B (Phys. Rev. B77,
(2008)) | null | 10.1103/PhysRevB.77.075131 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the t-J-$V$ model beyond mean field level at finite doping on the
triangular lattice. The Coulomb repulsion $V$ between nearest neighbors brings
the system to a charge ordered state for $V$ larger than a critical value
$V_c$. One-particle spectral properties as self-energy, spectral functions and
the quasiparticle weight are studied near and far from the charge ordered
phase. When the system approaches the charge ordered state, charge fluctuations
become soft and they strongly influence the system leading to incoherent
one-particle excitations. Possible implications for cobaltates are given.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:08:05 GMT"
}
] | 2012-07-30T00:00:00 | [
[
"Bejas",
"M.",
""
],
[
"Greco",
"A.",
""
],
[
"Muramatsu",
"A.",
""
],
[
"Foussats",
"A.",
""
]
] | [
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] |
802.0431 | Alasdair Allan | Alasdair Allan, Tim Naylor, Eric S. Saunders | Autonomous software: Myth or magic? | 3 pages, 4 figures, to appear in proceedings of Hot-wiring the
Transient Universe (HTU) 2007, Astronomische Nachrichten, March 2008 | Astron.Nachr.329:266-268,2008 | 10.1002/asna.200710961 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss work by the eSTAR project which demonstrates a fully closed loop
autonomous system for the follow up of possible micro-lensing anomalies. Not
only are the initial micro-lensing detections followed up in real time, but
ongoing events are prioritised and continually monitored, with the returned
data being analysed automatically. If the ``smart software'' running the
observing campaign detects a planet-like anomaly, further follow-up will be
scheduled autonomously and other telescopes and telescope networks alerted to
the possible planetary detection. We further discuss the implications of this,
and how such projects can be used to build more general autonomous observing
and control systems.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:12:23 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Allan",
"Alasdair",
""
],
[
"Naylor",
"Tim",
""
],
[
"Saunders",
"Eric S.",
""
]
] | [
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802.0432 | Viktor Veszpremi | CDF Collaboration: T. Aaltonen, et al | Search for the Higgs boson in events with missing transverse energy and
b quark jets produced in proton-antiproton collisions at s**(1/2)=1.96 TeV | 8 pages, 2 figures, submitted to Phys. Rev. Lett | Phys.Rev.Lett.100:211801,2008 | 10.1103/PhysRevLett.100.211801 | FERMILAB-PUB-08-023-E | hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We search for the standard model Higgs boson produced in association with an
electroweak vector boson in events with no identified charged leptons, large
imbalance in transverse momentum, and two jets where at least one contains a
secondary vertex consistent with the decay of b hadrons. We use ~1 fb-1
integrated luminosity of proton-antiproton collisions at s**(1/2)=1.96 TeV
recorded by the CDF II experiment at the Tevatron. We find 268 (16) single
(double) b-tagged candidate events, where 248 +/- 43 (14.4 +/- 2.7) are
expected from standard model background processes. We place 95% confidence
level upper limits on the Higgs boson production cross section for several
Higgs boson masses ranging from 110 GeV/c2 to 140 GeV/c2. For a mass of 115
GeV/c2 the observed (expected) limit is 20.4 (14.2) times the standard model
prediction.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:13:11 GMT"
}
] | 2010-05-12T00:00:00 | [
[
"CDF Collaboration",
"",
""
],
[
"Aaltonen",
"T.",
""
]
] | [
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] |
802.0433 | Mathieu Ribatet | Mathieu Ribatet (UR HHLY, INRS), Eric Sauquet (UR HHLY), Jean-Michel
Gr\'esillon (UR HHLY), Taha B.M.J. Ouarda (INRS) | A regional Bayesian POT model for flood frequency analysis | null | Stochastic Environmental Research and Risk Assessment 21, 4 (2006)
327-339 | 10.1007/s00477-006-0068-z | null | stat.AP | null | Flood frequency analysis is usually based on the fitting of an extreme value
distribution to the local streamflow series. However, when the local data
series is short, frequency analysis results become unreliable. Regional
frequency analysis is a convenient way to reduce the estimation uncertainty. In
this work, we propose a regional Bayesian model for short record length sites.
This model is less restrictive than the index flood model while preserving the
formalism of "homogeneous regions". The performance of the proposed model is
assessed on a set of gauging stations in France. The accuracy of quantile
estimates as a function of the degree of homogeneity of the pooling group is
also analysed. The results indicate that the regional Bayesian model
outperforms the index flood model and local estimators. Furthermore, it seems
that working with relatively large and homogeneous regions may lead to more
accurate results than working with smaller and highly homogeneous regions.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:17:34 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Ribatet",
"Mathieu",
"",
"UR HHLY, INRS"
],
[
"Sauquet",
"Eric",
"",
"UR HHLY"
],
[
"Grésillon",
"Jean-Michel",
"",
"UR HHLY"
],
[
"Ouarda",
"Taha B. M. J.",
"",
"INRS"
]
] | [
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] |
802.0434 | Guillermo Gonzalez | Guillermo Gonzalez | Parent Stars of Extrasolar Planets. IX. Lithium Abundances | 8 pages, 9 figures; accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13067.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the Li abundances of a sample of stars with planets discovered
with the Doppler method to a sample of stars without detected planets. We
prepared the samples by combining the Li abundances reported in several recent
studies in a consistent way. Our results confirm recent claims that the Li
abundances of stars with planets are smaller than those of stars without
planets near the solar temperature. We also find that the vsini and $R^{'}_{\rm
HK}$ anomalies correlate with the Li abundance anomalies. These results suggest
that planet formation processes have altered the rotation and Li abundances of
stars that host Doppler detected planets. We encourage others to test these
findings with additional observations of Li in stars with temperatures between
5600 and 6200 K.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:19:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gonzalez",
"Guillermo",
""
]
] | [
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802.0435 | Monique Combescot | M. Combescot, O. Betbeder-Matibet | A predicted "Faraday oscillation" in photoexcited semiconductors | null | null | null | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While, for semiconductors photoexcited by a circularly polarized pump, the
polarization plane of a linearly polarized probe has been shown to rotate, we
here predict a spectacular change when the pump beam is linearly polarized,
from Faraday rotation to Faraday oscillation, the oscillation of the
polarization plane going along a change of the photon polarization from linear
to elliptical. This effect, which reduces to zero when the probe field is
parallel or perpendicular to the pump field, comes from coherence between the
real excitons created by the pump and the virtual exciton coupled to the
unabsorbed probe, as easy to see from the Shiva diagrams which represent the
many-body physics taking place in this coupled photon-composite-exciton system.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:21:10 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Combescot",
"M.",
""
],
[
"Betbeder-Matibet",
"O.",
""
]
] | [
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802.0436 | Mathieu Ribatet | Mathieu Ribatet (UR HHLY, INRS), Taha B.M.J. Ouarda (INRS), Eric
Sauquet (UR HHLY), Jean-Michel Gr\'esillon (UR HHLY) | Modeling All Exceedances Above a Threshold Using an Extremal Dependence
Structure: Inferences on Several Flood Characteristics | null | null | 10.1029/2007WR006322 | null | stat.AP | null | Flood quantile estimation is of great importance for many engineering studies
and policy decisions. However, practitioners must often deal with small data
available. Thus, the information must be used optimally. In the last decades,
to reduce the waste of data, inferential methodology has evolved from annual
maxima modeling to peaks over a threshold one. To mitigate the lack of data,
peaks over a threshold are sometimes combined with additional information -
mostly regional and historical information. However, whatever the extra
information is, the most precious information for the practitioner is found at
the target site. In this study, a model that allows inferences on the whole
time series is introduced. In particular, the proposed model takes into account
the dependence between successive extreme observations using an appropriate
extremal dependence structure. Results show that this model leads to more
accurate flood peak quantile estimates than conventional estimators. In
addition, as the time dependence is taken into account, inferences on other
flood characteristics can be performed. An illustration is given on flood
duration. Our analysis shows that the accuracy of the proposed models to
estimate the flood duration is related to specific catchment characteristics.
Some suggestions to increase the flood duration predictions are introduced.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:21:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ribatet",
"Mathieu",
"",
"UR HHLY, INRS"
],
[
"Ouarda",
"Taha B. M. J.",
"",
"INRS"
],
[
"Sauquet",
"Eric",
"",
"UR HHLY"
],
[
"Grésillon",
"Jean-Michel",
"",
"UR HHLY"
]
] | [
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802.0437 | Frederic Bernicot | Frederic Bernicot (LM-Orsay) | A bilinear pseudodifferential calculus | 28 pages | null | null | null | math.CA math.AP | null | In this paper, we are interested in the construction of a bilinear
pseudodifferential calculus. We define some symbolic classes which contains
those of Coifman-Meyer. These new classes allow us to consider operators
closely related to the bilinear Hilbert transform. We give a description of the
action of our bilinear operators on Sobolev spaces. These classes also have a
``nice'' behavior through the transposition and the composition operations that
we will present.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:21:59 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 07:13:59 GMT"
}
] | 2008-02-21T00:00:00 | [
[
"Bernicot",
"Frederic",
"",
"LM-Orsay"
]
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802.0438 | Lorenzo Maccone | Lorenzo Maccone | A quantum solution to the arrow-of-time dilemma | Contains slightly more material than the published version (the
additional material is clearly labeled in the latex source). Because of PRL's
title policy, the leading "A" was left out of the title in the published
paper | Phys.Rev.Lett.103:080401,2009 | 10.1103/PhysRevLett.103.080401 | null | quant-ph nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The arrow of time dilemma: the laws of physics are invariant for time
inversion, whereas the familiar phenomena we see everyday are not (i.e. entropy
increases). I show that, within a quantum mechanical framework, all phenomena
which leave a trail of information behind (and hence can be studied by physics)
are those where entropy necessarily increases or remains constant. All
phenomena where the entropy decreases must not leave any information of their
having happened. This situation is completely indistinguishable from their not
having happened at all. In the light of this observation, the second law of
thermodynamics is reduced to a mere tautology: physics cannot study those
processes where entropy has decreased, even if they were commonplace.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:25:45 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Sep 2008 11:33:28 GMT"
},
{
"version": "v3",
"created": "Tue, 25 Aug 2009 16:27:32 GMT"
}
] | 2010-04-22T00:00:00 | [
[
"Maccone",
"Lorenzo",
""
]
] | [
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802.0439 | Fatine Latif | Emmanuel Fricain (ICJ), Javad Mashreghi | Exceptional sets for the derivatives of Blaschke products | null | null | null | null | math.CV | null | We obtain growth estimates for the logarithmic derivative $B'(z)/B(z)$ of a
Blaschke product as $|z| \to 1$ and $z$ avoids some exceptional sets.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:26:53 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Fricain",
"Emmanuel",
"",
"ICJ"
],
[
"Mashreghi",
"Javad",
""
]
] | [
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] |
802.044 | Hubert Rubenthaler | Hubert Rubenthaler (IRMA) | Invariant differential operators and an infinite dimensional Howe-type
correspondence. Part I: Structure of the associated algebras of differential
operators | 39 pages | null | null | null | math.RT | null | If $Q$ is a non degenerate quadratic form on ${\bb C}^n$, it is well known
that the differential operators $X=Q(x)$, $Y=Q(\partial)$, and
$H=E+\frac{n}{2}$, where $E$ is the Euler operator, generate a Lie algebra
isomorphic to ${\go sl}_{2}$. Therefore the associative algebra they generate
is a quotient of the universal enveloping algebra ${\cal U}({\go sl}_{2})$.
This fact is in some sense the foundation of the metaplectic representation.
The present paper is devoted to the study of the case where $Q(x)$ is replaced
by $\Delta_{0}(x)$, where $\Delta_{0}(x)$ is the relative invariant of a
prehomogeneous vector space of commutative parabolic type ($ {\go g},V $), or
equivalently where $\Delta_{0}$ is the "determinant" function of a simple
Jordan algebra $V$ over ${\bb C}$. In this Part I we show several structure
results for the associative algebra generated by $X=\Delta_{0}(x)$,
$Y=\Delta_{0}(\partial)$. Our main result shows that if we consider this
algebra as an algebra over a certain commutative ring ${\bf A}$ of invariant
differential operators it is isomorphic to the quotient of what we call a
generalized Smith algebra $S(f, {\bf A}, n)$ where $f\in {\bf A}[t]$. The Smith
algebras (over ${\bb C}$) were introduced by P. Smith as "natural"
generalizations of ${\cal U}({\go sl}_{2})$.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:27:20 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Rubenthaler",
"Hubert",
"",
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] |
802.0441 | Cheryl Hurkett | C. P. Hurkett, S. Vaughan, J. P. Osborne, P. T. O'Brien, K. L. Page,
A. Beardmore, O. Godet, D. N. Burrows, M. Capalbi, P. Evans, N. Gehrels, M.
R. Goad, J. E. Hill, J. Kennea, T. Mineo, M. Perri and R. Starling | Line Searches in Swift X-ray Spectra | Accepted by ApJ | null | 10.1086/586881 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Prior to the launch of the Swift mission several X-ray line detections were
reported in Gamma Ray Burst afterglow spectra. To date, these pre-Swift era
results have not been conclusively confirmed. The most contentious issue in
this area is the choice of statistical method used to evaluate the significance
of these features. In this paper we compare three different methods already
extant in the literature for assessing the significance of possible line
features and discuss their relative advantages and disadvantages. The methods
are demonstrated by application to observations of 40 bursts from the archive
of Swift XRT at early times (< few ks post trigger in the rest frame of the
burst). Based on this thorough analysis we found no strong evidence for
emission lines. For each of the three methods we have determined detection
limits for emission line strengths in bursts with spectral parameters typical
of the Swift-era sample. We also discuss the effects of the current calibration
status on emission line detection.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:28:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hurkett",
"C. P.",
""
],
[
"Vaughan",
"S.",
""
],
[
"Osborne",
"J. P.",
""
],
[
"O'Brien",
"P. T.",
""
],
[
"Page",
"K. L.",
""
],
[
"Beardmore",
"A.",
""
],
[
"Godet",
"O.",
""
],
[
"Burrows",
"D. N.",
""
],
[
"Capalbi",
"M.",
""
],
[
"Evans",
"P.",
""
],
[
"Gehrels",
"N.",
""
],
[
"Goad",
"M. R.",
""
],
[
"Hill",
"J. E.",
""
],
[
"Kennea",
"J.",
""
],
[
"Mineo",
"T.",
""
],
[
"Perri",
"M.",
""
],
[
"Starling",
"R.",
""
]
] | [
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802.0442 | Loic Foissy | Lo\"ic Foissy (LM-Reims) | The infinitesimal Hopf algebra and the poset of planar forests | 27 pages | null | null | null | math.RA | null | We introduce an infinitesimal Hopf algebra of planar trees, generalising the
construction of the non-commutative Connes-Kreimer Hopf algebra. A
non-degenerate pairing and a dual basis are defined, and a combinatorial
interpretation of the pairing in terms of orders on the vertices of planar
forests is given. Moreover, the coproduct and the pairing can also be described
with the help of a partial order on the set of planar forests, making it
isomorphic to the Tamari poset. As a corollary, the dual basis can be computed
with a M\"obius inversion.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:29:31 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Foissy",
"Loïc",
"",
"LM-Reims"
]
] | [
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] |
802.0443 | Mathieu Ribatet | Bertrand Iooss (LCFR, - M\'ethodes d'Analyse Stochastique des Codes et
Traitements Num\'eriques), Mathieu Ribatet (UR HHLY), Amandine Marrel (LMTE) | Global Sensitivity Analysis of Stochastic Computer Models with joint
metamodels | null | null | null | null | stat.ME stat.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The global sensitivity analysis method, used to quantify the influence of
uncertain input variables on the response variability of a numerical model, is
applicable to deterministic computer code (for which the same set of input
variables gives always the same output value). This paper proposes a global
sensitivity analysis methodology for stochastic computer code (having a
variability induced by some uncontrollable variables). The framework of the
joint modeling of the mean and dispersion of heteroscedastic data is used. To
deal with the complexity of computer experiment outputs, non parametric joint
models (based on Generalized Additive Models and Gaussian processes) are
discussed. The relevance of these new models is analyzed in terms of the
obtained variance-based sensitivity indices with two case studies. Results show
that the joint modeling approach leads accurate sensitivity index estimations
even when clear heteroscedasticity is present.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:31:30 GMT"
},
{
"version": "v2",
"created": "Tue, 13 Jan 2009 12:48:49 GMT"
},
{
"version": "v3",
"created": "Mon, 8 Jun 2009 09:36:49 GMT"
}
] | 2009-06-08T00:00:00 | [
[
"Iooss",
"Bertrand",
"",
"LCFR, - Méthodes d'Analyse Stochastique des Codes et\n Traitements Numériques"
],
[
"Ribatet",
"Mathieu",
"",
"UR HHLY"
],
[
"Marrel",
"Amandine",
"",
"LMTE"
]
] | [
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] |
802.0444 | Mathieu Ribatet | Mathieu Ribatet (UR HHLY, INRS), Eric Sauquet (UR HHLY), Jean-Michel
Gr\'esillon (UR HHLY), Taha B.M.J. Ouarda (INRS) | Usefulness of the Reversible Jump Markov Chain Monte Carlo Model in
Regional Flood Frequency Analysis | null | Water Resources Research 43, 8 (2007) W08403 | 10.1029/2006WR005525 | null | stat.AP | null | Regional flood frequency analysis is a convenient way to reduce estimation
uncertainty when few data are available at the gauging site. In this work, a
model that allows a non-null probability to a regional fixed shape parameter is
presented. This methodology is integrated within a Bayesian framework and uses
reversible jump techniques. The performance on stochastic data of this new
estimator is compared to two other models: a conventional Bayesian analysis and
the index flood approach. Results show that the proposed estimator is
absolutely suited to regional estimation when only a few data are available at
the target site. Moreover, unlike the index flood estimator, target site index
flood error estimation seems to have less impact on Bayesian estimators. Some
suggestions about configurations of the pooling groups are also presented to
increase the performance of each estimator.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:33:35 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Ribatet",
"Mathieu",
"",
"UR HHLY, INRS"
],
[
"Sauquet",
"Eric",
"",
"UR HHLY"
],
[
"Grésillon",
"Jean-Michel",
"",
"UR HHLY"
],
[
"Ouarda",
"Taha B. M. J.",
"",
"INRS"
]
] | [
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802.0445 | Tomasz Brzezinski | Tomasz Brzezinski | Non-commutative connections of the second kind | 13 pages, LaTeX | null | null | null | math.QA math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A connection-like objects, termed {\em hom-connections} are defined in the
realm of non-commutative geometry. The definition is based on the use of
homomorphisms rather than tensor products. It is shown that hom-connections
arise naturally from (strong) connections in non-commutative principal bundles.
The induction procedure of hom-connections via a map of differential graded
algebras or a differentiable bimodule is described. The curvature for a
hom-connection is defined, and it is shown that flat hom-connections give rise
to a chain complex.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:43:35 GMT"
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] | 2008-02-05T00:00:00 | [
[
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"Tomasz",
""
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802.0446 | Robert Seiringer | Christian Hainzl, Robert Seiringer | Spectral properties of the BCS gap equation of superfluidity | Plenary talk given by C. Hainzl at QMath10, Moeciu, Romania,
September 10-15, 2007 | null | 10.1142/9789812832382_0009 | null | math-ph cond-mat.supr-con math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a review of recent work on the mathematical aspects of the BCS gap
equation, covering our results of [arXiv:0801.4159] as well our recent joint
work with Hamza and Solovej [arXiv:math-ph/0703086] and with Frank and Naboko
[arXiv:0704.3564], respectively. In addition, we mention some related new
results.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:44:04 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Hainzl",
"Christian",
""
],
[
"Seiringer",
"Robert",
""
]
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802.0447 | Michael M. Wolf | D. Perez-Garcia, M.M. Wolf, M. Sanz, F. Verstraete, J.I. Cirac | String order and symmetries in quantum spin lattices | 5 pages, 1 figure | Phys. Rev. Lett. 100, 167202 (2008) | 10.1103/PhysRevLett.100.167202 | null | cond-mat.str-el cond-mat.stat-mech quant-ph | null | We show that the existence of string order in a given quantum state is
intimately related to the presence of a local symmetry by proving that both
concepts are equivalent within the framework of finitely correlated states.
Once this connection is established, we provide a complete characterization of
local symmetries in these states. The results allow to understand in a
straightforward way many of the properties of string order parameters, like
their robustness/fragility under perturbations and their typical disappearance
beyond strictly one-dimensional lattices. We propose and discuss an alternative
definition, ideally suited for detecting phase transitions, and generalizations
to two and more spatial dimensions.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 16:00:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Perez-Garcia",
"D.",
""
],
[
"Wolf",
"M. M.",
""
],
[
"Sanz",
"M.",
""
],
[
"Verstraete",
"F.",
""
],
[
"Cirac",
"J. I.",
""
]
] | [
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] |
802.0448 | Lassalle | Michel Lassalle (CNRS, Marne la Vallee, France) | Jack polynomials and free cumulants | 43 pages, LaTeX, to appear in Adv. Math | Advances in Mathematics 222 (2009) 2227-2269 | 10.1016/j.aim.2009.07.007 | null | math.CO math.PR math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the coefficients in the expansion of Jack polynomials in terms of
power sums. We express them as polynomials in the free cumulants of the
transition measure of an anisotropic Young diagram. We conjecture that such
polynomials have nonnegative integer coefficients. This extends recent results
about normalized characters of the symmetric group.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:51:44 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 15:11:25 GMT"
},
{
"version": "v3",
"created": "Tue, 28 Jul 2009 14:33:09 GMT"
}
] | 2009-10-11T00:00:00 | [
[
"Lassalle",
"Michel",
"",
"CNRS, Marne la Vallee, France"
]
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802.0449 | Vladimir Lobaskin | Olga I. Vinogradova, Kaloian Koynov, Andreas Best, Fran\c{c}ois
Feuillebois | Direct measurements of hydrophobic slippage using double-focus
fluorescence cross-correlation | null | null | 10.1103/PhysRevLett.102.118302 | null | cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report results of direct measurements of velocity profiles in a
microchannel with hydrophobic and hydrophilic walls, using a new high precision
method of double-focus spacial fluorescence cross-correlation under a confocal
microscope. In the vicinity of both walls the measured velocity profiles do not
turn to zero by giving a plateau of constant velocity. This apparent slip is
proven to be due to a Taylor dispersion, an augmented by shear diffusion of
nanotracers in the direction of flow. Comparing the velocity profiles near the
hydrophobic and hydrophilic walls for various conditions shows that there is a
true slip length due to hydrophobicity. This length, of the order of several
tens of nanometers, is independent on electrolyte concentration and shear rate.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:55:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Vinogradova",
"Olga I.",
""
],
[
"Koynov",
"Kaloian",
""
],
[
"Best",
"Andreas",
""
],
[
"Feuillebois",
"François",
""
]
] | [
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] |
802.045 | Qingzhao Yu | Qingzhao Yu, Bin Li, Richard Scribner, Deborah Cohen | Hierarchical Additive Modeling of Nonlinear Association with Spatial
Correlations-An Application to Relate Alcohol Outlet Density and Neighborhood
Assault Rates | 26 pages, 4 figures, submitted | null | null | null | stat.AP stat.ME | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous studies have suggested a link between alcohol outlets and assaultive
violence. In this paper, we explore the effects of alcohol availability on
assault crimes at the census tract level over time. The statistical analysis is
challenged by several features of the data: (1) the effects of possible
covariates (for example, the alcohol outlet density of each census tract) on
the assaultive crime rates may be complex; (2) the covariates may be highly
correlated with each other; (3) there are a lot of missing inputs in the data;
and (4) spatial correlations exist in the outcome assaultive crime rates. We
propose a hierarchical additive model, where the nonlinear correlations and the
complex interaction effects are modeled using the multiple additive regression
trees (MART) and the spatial variances in the assaultive rates that cannot be
explained by the specified covariates are smoothed trough the Conditional
Autoregressive (CAR) model. We develop a two-stage algorithm that connect the
non-parametric trees with CAR to look for important variables covariates
associated with the assaultive crime rates, while taking account of the spatial
correlations among adjacent census tracts. The proposed methods are applied to
the Los Angeles assaultive data (1990-1999) and compared with traditional
method.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 15:56:31 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Yu",
"Qingzhao",
""
],
[
"Li",
"Bin",
""
],
[
"Scribner",
"Richard",
""
],
[
"Cohen",
"Deborah",
""
]
] | [
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] |
802.0451 | Francesco Malaspina | Edoardo Ballico and Francesco Malaspina | Qregularity and an Extension of Evans-Griffiths Criterion to Vector
Bundles on Quadrics | 13 pages, no figures | null | null | null | math.AG | http://creativecommons.org/licenses/by/3.0/ | Here we define the concept of Qregularity for coherent sheaves on quadrics.
In this setting we prove analogs of some classical properties. We compare the
Qregularity of coherent sheaves on $\Q_n\subset \mathbb P^{n+1}$ with the
Castelnuovo-Mumford regularity of their extension by zero in $\mathbb P^{n+1}$.
We also classify the coherent sheaves with Qregularity $-\infty$. We use our
notion of Qregularity in order to prove an extension of Evans-Griffiths
criterion to vector bundles on Quadrics. In particular we get a new and simple
proof of the Kn\"{o}rrer's characterization of ACM bundles.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 16:00:35 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Ballico",
"Edoardo",
""
],
[
"Malaspina",
"Francesco",
""
]
] | [
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] |
802.0452 | Stefania Patrizi | Stefania Patrizi | Principal eigenvalues for Isaacs operators with Neumann boundary
conditions | 22 pages | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show the existence of two principal eigenvalues associated
to general non-convex fully nonlinear elliptic operators with Neumann boundary
conditions in a bounded $C^2$ domain. We study these objects and we establish
some of their basic properties. Finally, Lipschitz regularity, uniqueness and
existence results for the solution of the Neumann problem are given.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 16:26:54 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jun 2008 18:00:20 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Dec 2009 11:20:59 GMT"
}
] | 2009-12-10T00:00:00 | [
[
"Patrizi",
"Stefania",
""
]
] | [
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] |
802.0453 | Sergey Morozov | Sergey Morozov | Essential Spectrum of Multiparticle Brown-Ravenhall Operators in
External Field | 29 pages, submitted to Documenta Mathematica | Documenta Mathematica, 13:51-79, 2008 | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The essential spectrum of multiparticle Brown-Ravenhall operators is
characterized in terms of two--cluster decompositions for a wide class of
external fields and interparticle interactions and for the systems with
prescribed symmetries.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 16:28:45 GMT"
}
] | 2012-04-06T00:00:00 | [
[
"Morozov",
"Sergey",
""
]
] | [
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] |
802.0454 | Vladimir Ponomarev | V.Yu. Ponomarev and and A.I. Vdovin | Test of a modified BCS theory performance in the Picket Fence Model | null | null | 10.1016/j.nuclphysa.2009.03.001 | null | nucl-th | http://creativecommons.org/licenses/by/3.0/ | Analyses of a modified BCS (MBCS) theory performance at finite temperatures
in the Picket Fence Model (PFM) for light and heavy systems is presented. Both
symmetric, $\Omega=N$ ($N$ particles on $\Omega$ twice-degenerate levels), and
asymmetric, $\Omega\neq N$, versions of the PFM are considered. The quantities
known exactly from particle-hole symmetry of the $\Omega=N$ PFM are calculated.
Starting from very low temperatures, these quantities are found in dramatic
deviation from the exact values in MBCS results. Consequences of the MBCS
prediction that heating generates a thermal constituent of the pairing gap, are
discussed. Thermodynamical inconsistency of the MBCS is also addressed.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 16:58:16 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ponomarev",
"V. Yu.",
""
],
[
"Vdovin",
"and A. I.",
""
]
] | [
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] |
802.0455 | Luis Roca | H. Nagahiro, L. Roca and E. Oset | Meson loops in the $f_0(980)$ and $a_0(980)$ radiative decays into
$\rho$, $\omega$ | null | null | 10.1140/epja/i2008-10567-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the radiative decay widths of the $a_0(980)$ and $f_0(980)$
scalar mesons into $\rho\gamma$ and $\omega\gamma$ considering the dynamically
generated nature of these scalar resonances within the realm of the Chiral
Unitary Approach. The main ingredient in the evaluation of the radiative width
of the scalar mesons are the loops coming from the decay into their constituent
pseudoscalar-pseudoscalar components and the subsequent radiation of the
photon. The dominant diagrams with only pseudoscalar mesons in the loops are
found to be convergent while the divergence of those with a vector meson in the
loop are written in terms of the two meson loop function easily regularizable.
We provide results for all the possible charge channels and obtain results,
with uncertainties, which differ significantly from quark loops models and some
version of vector meson dominance.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 16:59:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nagahiro",
"H.",
""
],
[
"Roca",
"L.",
""
],
[
"Oset",
"E.",
""
]
] | [
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] |
802.0456 | Christopher S. Kochanek | C.S. Kochanek (1,3), J.F. Beacom (1,2,3), M.D. Kistler (2,3), J.L.
Prieto (1,3) K.Z. Stanek (1,3), T.A. Thompson (1,3), H. Yuksel (2,3) ((1)
Department of Astronomy, The Ohio State University, (2) Department of
Physics, The Ohio State University, (3) Center for Cosmology and
Astroparticle Physics, The Ohio State University) | A Survey About Nothing: Monitoring a Million Supergiants for Failed
Supernovae | final version, 7 pages, 5 figures, ApJ in press | Astrophys.J.684:1336-1342,2008 | 10.1086/590053 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extragalactic transient searches have historically been limited to looking
for the appearance of new sources such as supernovae. It is now possible to
carry out a new kind of survey that will do the opposite, that is, search for
the disappearance of massive stars. This will entail the systematic observation
of galaxies within a distance of 10 Mpc in order to watch ~10^6 supergiants.
Reaching this critical number ensures that something will occur yearly, since
these massive stars must end their lives with a core collapse within ~10^6
years. Using deep imaging and image subtraction it is possible to determine the
fates of these stars whether they end with a bang (supernova) or a whimper
(fall out of sight). Such a survey would place completely new limits on the
total rate of all core collapses, which is critical for determining the
validity of supernova models. It would also determine the properties of
supernova progenitors, better characterize poorly understood optical
transients, such as eta Carina-like mass ejections, find and characterize large
numbers of Cepheids, luminous blue variables and eclipsing binaries, and allow
the discovery of any new phenomena that inhabit this relatively unexplored
parameter space.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:09:48 GMT"
},
{
"version": "v2",
"created": "Sat, 3 May 2008 13:17:36 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Kochanek",
"C. S.",
""
],
[
"Beacom",
"J. F.",
""
],
[
"Kistler",
"M. D.",
""
],
[
"Prieto",
"J. L.",
""
],
[
"Stanek",
"K. Z.",
""
],
[
"Thompson",
"T. A.",
""
],
[
"Yuksel",
"H.",
""
]
] | [
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] |
802.0457 | Sergey Lysenko | Sergey Lysenko | Geometric theta-lifting for the dual pair GSp_{2n}, GSO_{2m} | LaTeX2e, 66 pages | null | null | null | math.RT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let X be a smooth projective curve over an algebraically closed field of
characteristic >2. Consider the dual pair H=GSO_{2m}, G=GSp_{2n} over X, where
H splits over an etale two-sheeted covering of X. Write Bun_G and Bun_H for the
stacks of G-torsors and H-torsors on X. We show that for m\le n (respectively,
for m>n) the theta-lifting functor from D(Bun_H) to D(Bun_G) (respectively,
from D(Bun_G) to D(Bun_H)) commutes with Hecke functors with respect to a
morphism of the corresponding L-groups involving the SL_2 of Arthur. So, they
realize the geometric Langlands functoriality for the corresponding morphisms
of L-groups.
As an application, we prove a particular case of the geometric Langlands
conjectures for GSp_4. Namely, we construct the automorphic Hecke eigensheaves
on Bun_{GSp_4} corresponding to the endoscopic local systems on X.
| [
{
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"created": "Mon, 4 Feb 2008 17:10:57 GMT"
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{
"version": "v2",
"created": "Sun, 26 Apr 2020 18:35:18 GMT"
},
{
"version": "v3",
"created": "Fri, 3 Dec 2021 18:21:56 GMT"
}
] | 2021-12-06T00:00:00 | [
[
"Lysenko",
"Sergey",
""
]
] | [
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802.0458 | Pinaki Sengupta | P. Sengupta and C. D. Batista | Ground state and thermal transitions in Field Induced spin-Supersolid
Phase | To appear in the Journal of Applied Physics as proceedings of the
52nd. Magnetism and Magnetic Materials Conference, Tampa, Fl | null | 10.1063/1.2830959 | null | cond-mat.str-el | null | We use a quantum Monte Carlo method to study the ground state and
thermodynamic phase transitions of the spin supersolid phase in the S=1
Heisenberg model with uniaxial anisotropy. The thermal melting of the
supersolid phase shows unqiue signatures in experimentally measurable
observables. This Hamiltonian is a particular case of a more general and
ubiquitous model that describes the low energy spectrum of a class of {\it
isotropic} and {\it frustrated} spin systems. We also discuss some alternative
realizations of spin supersolid states in real magnets.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:29:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sengupta",
"P.",
""
],
[
"Batista",
"C. D.",
""
]
] | [
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] |
802.0459 | Janna Levin | Janna Levin and Gabe Perez-Giz | A Periodic Table for Black Hole Orbits | 42 pages, lots of figures | null | 10.1103/PhysRevD.77.103005 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding the dynamics around rotating black holes is imperative to the
success of the future gravitational wave observatories. Although integrable in
principle, test particle orbits in the Kerr spacetime can also be elaborate,
and while they have been studied extensively, classifying their general
properties has been a challenge. This is the first in a series of papers that
adopts a dynamical systems approach to the study of Kerr orbits, beginning with
equatorial orbits. We define a taxonomy of orbits that hinges on a
correspondence between periodic orbits and rational numbers. The taxonomy
defines the entire dynamics, including aperiodic motion, since every orbit is
in or near the periodic set. A remarkable implication of this periodic orbit
taxonomy is that the simple precessing ellipse familiar from planetary orbits
is not allowed in the strong-field regime. Instead, eccentric orbits trace out
precessions of multi-leaf clovers in the final stages of inspiral. Furthermore,
for any black hole, there is some point in the strong-field regime past which
zoom-whirl behavior becomes unavoidable. Finally, we sketch the potential
application of the taxonomy to problems of astrophysical interest, in
particular its utility for computationally intensive gravitational wave
calculations.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:22:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Levin",
"Janna",
""
],
[
"Perez-Giz",
"Gabe",
""
]
] | [
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] |
802.046 | Victor Zernov | A. Gautesen, V. Zernov, and L. Fradkin | Diffraction coefficients of a semi-infinite planar crack embedded in a
transversely-isotropic space | 43 pages; 100 figures | null | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have considered a semi-infinite crack embedded in a transversely isotropic
medium and studied two special cases, one, in which the axis of symmetry is
normal to the crack face and the wave incidence is arbitrary and another, in
which the axis lies in the crack plane normal to the edge and the incident wave
vector is also normal to the edge. The problem is of interest in
Non-Destructive Evaluation, because austenitic steels that are found in
claddings and other welds in the nuclear reactors are often modeled as
transversely isotropic. In both of cases, we have expressed the scattered field
in a closed form and computed the corresponding diffraction coefficients.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:04:01 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 17:20:22 GMT"
},
{
"version": "v3",
"created": "Wed, 25 Feb 2009 15:04:26 GMT"
}
] | 2009-02-25T00:00:00 | [
[
"Gautesen",
"A.",
""
],
[
"Zernov",
"V.",
""
],
[
"Fradkin",
"L.",
""
]
] | [
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] |
802.0461 | Atsushi Yamaguchi | A. Yamaguchi, S. Uetake, D. Hashimoto, J. M. Doyle, Y. Takahashi | Inelastic Collisions in Optically Trapped Ultracold Metastable Ytterbium | 4 pages, 4 figures | null | 10.1103/PhysRevLett.101.233002 | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report measurement of inelastic loss in dense and cold metastable
ytterbium (Yb[$^3P_2$]). Use of an optical far-off-resonance trap enables us to
trap atoms in all magnetic sublevels, removing multichannel collisional trap
loss from the system. Trapped samples of Yb[$^3P_2$] are produced at a density
of 2$\times10^{13}$ cm$^{-3}$ and temperature of 2 $\mu$K. We observe rapid
two-body trap loss of Yb[$^3P_2$] and measure the inelastic collision rate
constant 1.0(3)$\times10^{-11}$ cm$^3$s$^{-1}$. The existence of the
fine-structure changing collisions between atoms in the $^3P_2$ state is
strongly suggested.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:30:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yamaguchi",
"A.",
""
],
[
"Uetake",
"S.",
""
],
[
"Hashimoto",
"D.",
""
],
[
"Doyle",
"J. M.",
""
],
[
"Takahashi",
"Y.",
""
]
] | [
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] |
802.0462 | Stefania Salvadori | S. Salvadori (1), A. Ferrara (1), R. Schneider (2) ((1) Sissa/Isas,
(2) Inaf/Oaa) | Life and times of dwarf spheroidal galaxies | 12 pages, 6 figures, MNRAS accepted | null | 10.1111/j.1365-2966.2008.13035.x | null | astro-ph | null | We propose a cosmological scenario for the formation and evolution of dwarf
spheroidal galaxies (dSphs), satellites of the Milky Way (MW). An improved
version of the semi-analytical code GAMETE (GAlaxy Merger Tree & Evolution) is
used to follow the dSphs evolution simultaneously with the MW formation,
matching the observed properties of both. In this scenario dSph galaxies
represent fossil objects virializing at z = 7.2 +/- 0.7 (i.e. in the
pre-reionization era z > z_rei = 6) in the MW environment, which at that epoch
has already been pre-enriched up to [Fe/H] ~ -3; their dynamical masses are in
the narrow range M = (1.6 +/- 0.7) x 10^8 M_sun, although a larger spread might
be introduced by a more refined treatment of reionization. Mechanical feedback
effects are dramatic in such low-mass objects, causing the complete blow-away
of the gas ~100 Myr after the formation epoch: 99% of the present-day stellar
mass, M_* = (3 +/- 0.7) x 10^6 M_sun, forms during this evolutionary phase,
i.e. their age is >13 Gyr. Later on, star formation is re-ignited by returned
gas from evolved stars and a second blow-away occurs. The cycle continues for
about 1 Gyr during which star formation is intermittent. At z = 0 the dSph gas
content is M_g = (2.68 +/- 0.97) x 10^4 M_sun. Our results match several
observed properties of Sculptor, used as a template of dSphs: (i) the
Metallicity Distribution Function; (ii) the Color Magnitude Diagram; (iii) the
decrement of the stellar [O/Fe] abundance ratio for [Fe/H] > -1.5; (iv) the
dark matter content and the light-to-mass ratio; (v) the HI gas mass content.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:15:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Salvadori",
"S.",
""
],
[
"Ferrara",
"A.",
""
],
[
"Schneider",
"R.",
""
]
] | [
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802.0463 | Adam Nowak | Adam Nowak and Peter Sj\"ogren | The multi-dimensional pencil phenomenon for Laguerre heat-diffusion
maximal operators | 30 pages with 1 figure. This paper was published as Preprint 2007:35,
Department of Mathematical Sciences, Chalmers University of Technology and
University of Gothenburg | Math. Ann. 344 (2009), 213-248. | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate in detail the mapping properties of the maximal operator
associated with the heat-diffusion semigroup corresponding to expansions with
respect to multi-dimensional standard Laguerre functions.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:43:42 GMT"
}
] | 2009-10-07T00:00:00 | [
[
"Nowak",
"Adam",
""
],
[
"Sjögren",
"Peter",
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802.0464 | Marie-No\"elle C\'el\'erier | Reuben Thieberger and Marie-No\"elle C\'el\'erier | Scaling Regimes as obtained from the DR5 Sloan Digital Sky Survey | 15 pages, 7 figures, submitted for publication in Astronomy and
Astrophysics | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Standard cosmology is based on the assumption that the universe is spatially
homogeneous. However the consensus on a homogeneous matter structure, even on
very large scales, has never been complete. The advantage of correlation
dimension calculations is that they enable one to obtain the transition scale
to a homogeneous distribution, whereas other methods, such as those using the
two-point correlation function, make it hard to exhibit the possible fractal
properties of the Universe matter content. Our purpose is to calculate the
correlation dimension $D_2$, looking for a possible transition to homogeneity,
which would imply $D_2 = 3$. We apply the correlation integral method to the
three dimensional sample composed of 332,876 galaxies which we extract from the
Fifth Data Release of the Sloan Digital Sky Survey. We analyze the raw data up
to the scale $d_{max} = 160$ Mpc, assuming $H_0 = 70$ km s$^{-1}$ Mpc$^{-1}$
and considering three cosmological models in order to test the model dependence
of our method. Using volume limited samples for this range leaves us with about
20,000 galaxies. Applying our method to random maps helps us to calibrate our
results. We obtain a correlation dimension of the galaxy distribution which
seems to increase with scales up to $D_2=3$ reached around 70 Mpc. The results
of our analysis, performed on the largest volume limited sample which can be
extracted from the SDSS catalog, are compatible with those formerly obtained by
other authors. However, to get a more reliable description of the structures at
various scales, we think it will be mandatory to use still larger catalogs than
those which are currently available.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:46:25 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Thieberger",
"Reuben",
""
],
[
"Célérier",
"Marie-Noëlle",
""
]
] | [
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] |
802.0465 | Garrett Cole | Garrett D. Cole, Simon Groeblacher, Katharina Gugler, Sylvain Gigan,
Markus Aspelmeyer | Monocrystalline AlGaAs heterostructures for high-reflectivity high-Q
micromechanical resonators in the MHz regime | 5 pages, 2 figures | Appl. Phys. Lett. 92, 261108 (2008) | 10.1063/1.2952512 | null | cond-mat.mes-hall physics.optics quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present high-performance megahertz micromechanical oscillators based on
freestanding epitaxial AlGaAs distributed Bragg reflectors. Compared with
dielectric reflectors, the low mechanical loss of the monocrystalline
heterostructure gives rise to significant improvements in the achievable
mechanical quality factor Q while simultaneously exhibiting near unity
reflectivity. Experimental characterization yields an optical reflectivity
exceeding 99.98% and mechanical quality factors up to 20 000 at 4 K. This
materials system is not only an interesting candidate for optical coatings with
ultralow thermal noise, but also provides a promising path toward quantum
optical control of massive micromechanical mirrors.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:27:43 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 00:01:20 GMT"
},
{
"version": "v3",
"created": "Thu, 18 Sep 2008 14:21:10 GMT"
}
] | 2008-09-18T00:00:00 | [
[
"Cole",
"Garrett D.",
""
],
[
"Groeblacher",
"Simon",
""
],
[
"Gugler",
"Katharina",
""
],
[
"Gigan",
"Sylvain",
""
],
[
"Aspelmeyer",
"Markus",
""
]
] | [
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] |
802.0466 | Allan Widom | A. Widom, Y.N. Srivastava, L. Larsen | Errors in the Quantum Electrodynamic Mass Analysis of Hagelstein and
Chaudhary | null | null | null | null | quant-ph | null | Hagelstein and Chaudhary have recently criticized our low energy nuclear
reaction rates in chemical cells based on our computed electron mass
renormalization for surface electrons of metal hydride electrodes. They further
criticize our electron mass renormalization in exploding wire systems which is
very strange because mass renormalization was {\em never even mentioned} in our
exploding wire work. Here we show that the calculations of Hagelstein and
Chaudhary are erroneous in that they are in conflict with the Gauss law, i.e.
they have arbitrarily removed all Coulomb interactions in electromagnetic
propagators. They have also ignored substantial Ampere interactions in favor of
computing only totally negligible contributions. When the fallacious
considerations of Hagelstein and Chaudhary are clearly exposed, it becomes
evident that our previous calculations remain valid.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:53:27 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 01:34:09 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Widom",
"A.",
""
],
[
"Srivastava",
"Y. N.",
""
],
[
"Larsen",
"L.",
""
]
] | [
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] |
802.0467 | Joseph Maher | Joseph Maher | Linear progress in the complex of curves | 28 pages, 14 figures, final version | null | null | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a random walk on the mapping class group of an orientable
surface of finite type makes linear progress in the relative metric, which is
quasi-isometric to the complex of curves.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:18:41 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Sep 2008 16:26:08 GMT"
},
{
"version": "v3",
"created": "Sun, 24 Jan 2010 20:28:09 GMT"
}
] | 2010-01-24T00:00:00 | [
[
"Maher",
"Joseph",
""
]
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] |
802.0468 | Jacek Pawelczyk | Jacek Pawe{\l}czyk | Gauge Symmetry Breaking in a Throat Geometry | Latex, 16 pages | null | 10.1142/S0217732308028570 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze behaviour of D3-branes in BGMPZ throat geometry. We show that
although single brane has some of the moduli stabilized multi-brane system
tends to expand and form a bound state. Such a system loses non-abelian gauge
symmetry.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 17:59:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pawełczyk",
"Jacek",
""
]
] | [
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] |
802.0469 | Bahman Engheta | Bahman Engheta | Bound on the multiplicity of almost complete intersections | 7 pages; to appear in Communications in Algebra | Communications in Algebra 37 (2009), 948-953 | 10.1080/00927870802278784 | null | math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $R$ be a polynomial ring over a field of characteristic zero and let $I
\subset R$ be a graded ideal of height $N$ which is minimally generated by
$N+1$ homogeneous polynomials. If $I=(f_1,...,f_{N+1})$ where $f_i$ has degree
$d_i$ and $(f_1,...,f_N)$ has height $N$, then the multiplicity of $R/I$ is
bounded above by $\prod_{i=1}^N d_i - \max\{1, \sum_{i=1}^N (d_i-1) -
(d_{N+1}-1) \}$.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:17:36 GMT"
}
] | 2010-10-20T00:00:00 | [
[
"Engheta",
"Bahman",
""
]
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802.047 | Cristina Timirgaziu | Gerald B. Cleaver, Alon E. Faraggi, Elisa Manno and Cristina
Timirgaziu | Quasi-realistic heterotic-string models with vanishing one-loop
cosmological constant and perturbatively broken supersymmetry? | 37 pages, LaTeX. Added discussion on stringent flat directions. PRD
published version | Phys.Rev.D78:046009,2008 | 10.1103/PhysRevD.78.046009 | LTH-779, BU-HEPP 07-07, CASPER 07-03 | hep-th hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quasi-realistic string models in the free fermionic formulation typically
contain an anomalous U(1), which gives rise to a Fayet-Iliopoulos D-term that
breaks supersymmetry at the one--loop level in string perturbation theory.
Supersymmetry is traditionally restored by imposing F- and D-flatness on the
vacuum. By employing the standard analysis of flat directions we present a
quasi--realistic three generation string model in which stringent F- and D-flat
solution do not appear to exist to all orders in the superpotential. We
speculate that this result is indicative of the non-existence of supersymmetric
flat F- and D-solutions in this model. We provide some arguments in support of
this scenario and discuss its potential implications. Bose-Fermi degeneracy of
the string spectrum implies that the one--loop partition function and hence the
one-loop cosmological constant vanishes in the model. If our assertion is
correct, this model may represent the first known example with vanishing
cosmological constant and perturbatively broken supersymmetry. We discuss the
distinctive properties of the internal free fermion boundary conditions that
may correspond to a large set of models that share these properties. The
geometrical moduli in this class of models are fixed due to asymmetric boundary
conditions, whereas absence of supersymmetric flat directions would imply that
the supersymmetric moduli are fixed as well and the dilaton may be fixed by
hidden sector nonperturbative effects.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:51:14 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Sep 2008 11:55:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cleaver",
"Gerald B.",
""
],
[
"Faraggi",
"Alon E.",
""
],
[
"Manno",
"Elisa",
""
],
[
"Timirgaziu",
"Cristina",
""
]
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] |
802.0471 | Cristiano Guidorzi | F. Rossi (1), C. Guidorzi (2,3), L. Amati (4), F. Frontera (1,4), P.
Romano (2,3), S. Campana (3), G. Chincarini (2,3), E. Montanari (1), A.
Moretti (3), G. Tagliaferri (3) ((1) Universita' di Ferrara (2) Universita'
di Milano Bicocca (3) INAF-OAB (4) INAF-IASF Bologna, Italy) | Testing the E_p,i - L_p,iso - T_0.45 correlation on a BeppoSAX and Swift
sample of gamma-ray bursts | 9 pages, 4 figures, revised version submitted to MNRAS | Mon.Not.Roy.Astron.Soc.388:1284-1292,2008 | 10.1111/j.1365-2966.2008.13476.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a sample of 14 BeppoSAX and 74 Swift GRBs with measured redshift we
tested the correlation between the intrinsic peak energy of the time-integrated
spectrum, E_p,i, the isotropic-equivalent peak luminosity, L_p,iso, and the
duration of the most intense parts of the GRB computed as T_0.45 ("Firmani
correlation"). For 41 out of 88 GRBs we could estimate all of the three
required properties. Apart from 980425, which appears to be a definite outlier
and notoriously peculiar in many respects, we used 40 GRBs to fit the
correlation with the maximum likelihood method discussed by D'Agostini,
suitable to account for the extrinsic scatter in addition to the intrinsic
uncertainties affecting every single GRB. We confirm the correlation. However,
unlike the results by Firmani et al., we found that the correlation does have a
logarithmic scatter comparable with that of the E_p,i-E_iso ("Amati")
correlation. We also find that the slope of the product L_p,iso T_0.45 is equal
to ~0.5, which is consistent with the hypothesis that the E_p,i-L_p,iso-T_0.45
correlation is equivalent to the E_p,i-E_iso correlation (slope ~0.5). We
conclude that, based on presently available data, there is no clear evidence
that the E_p,i-L_p,iso-T_0.45 correlation is different (both in terms of slope
and dispersion) from the E_p,i-E_iso correlation.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:32:09 GMT"
},
{
"version": "v2",
"created": "Sat, 3 May 2008 16:08:04 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Rossi",
"F.",
""
],
[
"Guidorzi",
"C.",
""
],
[
"Amati",
"L.",
""
],
[
"Frontera",
"F.",
""
],
[
"Romano",
"P.",
""
],
[
"Campana",
"S.",
""
],
[
"Chincarini",
"G.",
""
],
[
"Montanari",
"E.",
""
],
[
"Moretti",
"A.",
""
],
[
"Tagliaferri",
"G.",
""
]
] | [
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] |
802.0472 | Nicolas Brunner | Nicolas Brunner, Cyril Branciard and Nicolas Gisin | Can one see entanglement ? | 5 pages, 5 figures | Phys. Rev. A 78, 052110 (2008) | 10.1103/PhysRevA.78.052110 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The human eye can detect optical signals containing only a few photons. We
investigate the possibility to demonstrate entanglement with such biological
detectors. While one person could not detect entanglement by simply observing
photons, we discuss the possibility for several observers to demonstrate
entanglement in a Bell-type experiment, in which standard detectors are
replaced by human eyes. Using a toy model for biological detectors that
captures their main characteristic, namely a detection threshold, we show that
Bell inequalities can be violated, thus demonstrating entanglement. Remarkably,
when the response function of the detector is close to a step function, quantum
non-locality can be demonstrated without any further assumptions. For smoother
response functions, as for the human eye, post-selection is required.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:34:26 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Nov 2008 16:06:18 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Brunner",
"Nicolas",
""
],
[
"Branciard",
"Cyril",
""
],
[
"Gisin",
"Nicolas",
""
]
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] |
802.0473 | Jonas Fransson | J. Fransson | Detection of spin reversal and nutations through current measurements | 5 pages, 5 figures; published version (with minor corrections) | Nanotechnology, 19, 285714 (2008) | 10.1088/0957-4484/19/28/285714 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of a single spin embedded in a the tunnel junction between
ferromagnetic contacts is strongly affected by the exchange coupling to the
tunneling electrons. Moment reversal of the local spin induced by the bias
voltage across the junction is shown to have a measurable effect on the
tunneling current. Furthermore, the frequency of a harmonic bias voltage is
picked up by the local spin dynamics and transferred back to the current
generating a double frequency component.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:36:26 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jun 2008 04:47:36 GMT"
}
] | 2008-06-04T00:00:00 | [
[
"Fransson",
"J.",
""
]
] | [
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802.0474 | Adam Nowak | Adam Nowak and Krzysztof Stempak | Riesz transforms for the Dunkl harmonic oscillator | 22 pages | Math. Z. 262 (2009), 539-556. | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define and investigate a system of Riesz transforms related to the Dunkl
harmonic oscillator.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:40:30 GMT"
}
] | 2009-10-07T00:00:00 | [
[
"Nowak",
"Adam",
""
],
[
"Stempak",
"Krzysztof",
""
]
] | [
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802.0475 | David Uminsky | Ray Nagem, Guido Sandri, David Uminsky, C. Eugene Wayne | Generalized Helmholtz-Kirchhoff model for two dimensional distributed
vortex motion | null | null | 10.1137/080715056 | null | math.DS math.AP math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-dimensional Navier-Stokes equations are rewritten as a system of
coupled nonlinear ordinary differential equations. These equations describe the
evolution of the moments of an expansion of the vorticity with respect to
Hermite functions and of the centers of vorticity concentrations. We prove the
convergence of this expansion and show that in the zero viscosity and zero core
size limit we formally recover the Helmholtz-Kirchhoff model for the evolution
of point-vortices. The present expansion systematically incorporates the
effects of both viscosity and finite vortex core size. We also show that a
low-order truncation of our expansion leads to the representation of the flow
as a system of interacting Gaussian (i.e. Oseen) vortices which previous
experimental work has shown to be an accurate approximation to many important
physical flows [9].
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:44:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nagem",
"Ray",
""
],
[
"Sandri",
"Guido",
""
],
[
"Uminsky",
"David",
""
],
[
"Wayne",
"C. Eugene",
""
]
] | [
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] |
802.0476 | Gilles Pisier | Gilles Pisier | Complex Interpolation between Hilbert, Banach and Operator spaces | A detailed proof of Hernandez Theorem 4.6 has been added, as well as
various minor improvements and clarifications | Memoirs Amer. Math. Soc. 208 (2010), no. 978 | null | null | math.FA math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by a question of Vincent Lafforgue, we study the Banach spaces $X$
satisfying the following property: there is a function $\vp\to \Delta_X(\vp)$
tending to zero with $\vp>0$ such that every operator $T\colon L_2\to L_2$ with
$\|T\|\le \vp$ that is simultaneously contractive (i.e. of norm $\le 1$) on
$L_1$ and on $L_\infty$ must be of norm $\le \Delta_X(\vp)$ on $L_2(X)$.
We show that $\Delta_X(\vp)\in O(\vp^\alpha)$ for some $\alpha>0$ iff $X$ is
isomorphic to a quotient of a subspace of an ultraproduct of
$\theta$-Hilbertian spaces for some $ \theta>0$ (see Corollary
\ref{comcor4.3}), where $\theta$-Hilbertian is meant in a slightly more general
sense than in our previous paper \cite{P1}. Let $B_{r}(L_2(\mu))$ be the space
of all regular operators on $L_2(\mu)$. We are able to describe the complex
interpolation space \[ (B_{r}(L_2(\mu), B(L_2(\mu))^\theta. \] We show that
$T\colon L_2(\mu)\to L_2(\mu)$ belongs to this space iff $T\otimes id_X$ is
bounded on $L_2(X)$ for any $\theta$-Hilbertian space $X$.
More generally, we are able to describe the spaces $$ (B(\ell_{p_0}),
B(\ell_{p_1}))^\theta {\rm or} (B(L_{p_0}), B(L_{p_1}))^\theta $$ for any pair
$1\le p_0,p_1\le \infty$ and $0<\theta<1$. In the same vein, given a locally
compact Abelian group $G$, let $M(G)$ (resp. $PM(G)$) be the space of complex
measures (resp. pseudo-measures) on $G$ equipped with the usual norm
$\|\mu\|_{M(G)} = |\mu|(G)$ (resp. \[ \|\mu\|_{PM(G)} = \sup\{|\hat\mu(\gamma)|
\big| \gamma\in\hat G\}). \] We describe similarly the interpolation space
$(M(G), PM(G))^\theta$. Various extensions and variants of this result will be
given, e.g. to Schur multipliers on $B(\ell_2)$ and to operator spaces.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:58:18 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 13:51:24 GMT"
},
{
"version": "v3",
"created": "Fri, 22 Feb 2008 17:44:02 GMT"
},
{
"version": "v4",
"created": "Wed, 11 Jun 2008 14:09:32 GMT"
},
{
"version": "v5",
"created": "Wed, 17 Dec 2008 14:57:54 GMT"
}
] | 2014-12-23T00:00:00 | [
[
"Pisier",
"Gilles",
""
]
] | [
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802.0477 | Christian Lomp | Christian Lomp and Engin B\"uy\"uka\c{s}ik | On a recent generalization of semiperfect rings | null | null | null | CMUP 2008-5 | math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It follows from a recent paper by Ding and Wang that any ring which is
generalized supplemented as left module over itself is semiperfect. The purpose
of this note is to show that Ding and Wang's claim is not true and that the
class of generalized supplemented rings lies properly between the class of
semilocal and semiperfect rings. Moreover we rectify their claim by introducing
a wider notion of local submodules.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 19:09:44 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Lomp",
"Christian",
""
],
[
"Büyükaşik",
"Engin",
""
]
] | [
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] |
802.0478 | Igor M. Suslov | I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow,
Russia) | Localization Theory in Zero Dimension and the Structure of Diffusion
Poles | PDF, 11pages | JETP 105, 1198 (2007) [Zh.Eksp.Teor.Fiz. 132, 1368 (2007)] | null | null | cond-mat.other cond-mat.mes-hall hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 1/[-i\omega + D(\omega, q)q^2] diffusion pole in the localized phase
transfers to the 1/\omega Berezinskii-Gorkov singularity, which can be analyzed
by the instanton method (M V. Sadovskii, 1982; J. L. Cardy, 1978).
Straightforward use of this approach leads to contradictions, which do not
disappear even if the problem is extremely simplied by taking zero-dimensional
limit. On the contrary, they are extremely sharpened in this case and become
paradoxes. The main paradox is specified by the following statements: (i) the
1/\omega singularity is determined by high orders of perturbation theory, (ii)
the high-order behaviors for two quantities \Phi^{RA} and U^{RA} are the same,
and (iii) \Phi^{RA} has the 1/\omega singularity, whereas U^{RA} does not have
it. Solution to the paradox indicates that the instanton method makes it
possible to obtain only the 1/(\omega + i\gamma) singularity, where the
parameter \gamma remains indefinite and must be determined from additional
conditions. This conceptually confirms the necessity of the self-consistent
treatment for the diffusion coefficient that is used in the Vollhardt-Wolfle
type theories.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 19:15:11 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Suslov",
"I. M.",
"",
"P.L.Kapitza Institute for Physical Problems, Moscow,\n Russia"
]
] | [
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802.0479 | Anders K.H. Bengtsson | Anders K.H. Bengtsson | Towards Unifying Structures in Higher Spin Gauge Symmetry | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4:013,2008 | 10.3842/SIGMA.2008.013 | null | hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | This article is expository in nature, outlining some of the many still
incompletely understood features of higher spin field theory. We are mainly
considering higher spin gauge fields in their own right as free-standing
theoretical constructs and not circumstances where they occur as part of
another system. Considering the problem of introducing interactions among
higher spin gauge fields, there has historically been two broad avenues of
approach. One approach entails gauging a non-Abelian global symmetry algebra,
in the process making it local. The other approach entails deforming an already
local but Abelian gauge algebra, in the process making it non-Abelian. In cases
where both avenues have been explored, such as for spin 1 and 2 gauge fields,
the results agree (barring conceptual and technical issues) with Yang-Mills
theory and Einstein gravity. In the case of an infinite tower of higher spin
gauge fields, the first approach has been thoroughly developed and explored by
M. Vasiliev, whereas the second approach, after having lain dormant for a long
time, has received new attention by several authors lately. In the present
paper we briefly review some aspects of the history of higher spin gauge fields
as a backdrop to an attempt at comparing the gauging vs. deforming approaches.
A common unifying structure of strongly homotopy Lie algebras underlying both
approaches will be discussed. The modern deformation approach, using BRST-BV
methods, will be described as far as it is developed at the present time. The
first steps of a formulation in the categorical language of operads will be
outlined. A few aspects of the subject that seems not to have been thoroughly
investigated are pointed out.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 19:16:30 GMT"
}
] | 2008-12-19T00:00:00 | [
[
"Bengtsson",
"Anders K. H.",
""
]
] | [
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802.048 | Andrea Taroni | Andrea Taroni, Steven T. Bramwell and Peter C. W. Holdsworth | Universal Window for Two Dimensional Critical Exponents | 26 pages, 5 figures and 6 tables. Uses longtable package | J. Phys.: Condens. Matter 20 275233 (2008) | 10.1088/0953-8984/20/27/275233 | null | cond-mat.stat-mech | http://creativecommons.org/licenses/by/3.0/ | Two dimensional condensed matter is realised in increasingly diverse forms
that are accessible to experiment and of potential technological value. The
properties of these systems are influenced by many length scales and reflect
both generic physics and chemical detail. To unify their physical description
is therefore a complex and important challenge. Here we investigate the
distribution of experimentally estimated critical exponents, $\beta$, that
characterize the evolution of the order parameter through the ordering
transition. The distribution is found to be bimodal and bounded within a window
$\sim 0.1 \le \beta \le 0.25$, facts that are only in partial agreement with
the established theory of critical phenomena. In particular, the bounded nature
of the distribution is impossible to reconcile with existing theory for one of
the major universality classes of two dimensional behaviour - the XY model with
four fold crystal field - which predicts a spectrum of non-universal exponents
bounded only from below. Through a combination of numerical and renormalization
group arguments we resolve the contradiction between theory and experiment and
demonstrate how the "universal window" for critical exponents observed in
experiment arises from a competition between marginal operators.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 19:28:47 GMT"
}
] | 2011-07-15T00:00:00 | [
[
"Taroni",
"Andrea",
""
],
[
"Bramwell",
"Steven T.",
""
],
[
"Holdsworth",
"Peter C. W.",
""
]
] | [
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802.0481 | Steven Spangler | Catherine A. Whiting, Steven R. Spangler, Laura D. Ingleby, L. Matthew
Haffner | Confirmation of a Faraday Rotation Measure Anomaly in Cygnus | Submitted to the Astrophysical Journal | Astrophys.J.694:1452-1463,2009 | 10.1088/0004-637X/694/2/1452 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We confirm the reality of a reversal of the sign of the Faraday Rotation
Measure in the Galactic plane in Cygnus (Lazio et al, 1990), possibly
associated with the Cygnus OB1 association. The rotation measure changes by
several hundred rad/m$^2$ over an angular scale of $2-5^{\circ}$. We show that
a simple model of an expanding plasma shell with an enhanced density and
magnetic field, consistent with observations of H$\alpha$ emission in this part
of sky, and physically associated with a superbubble of the Cygnus OB1
association, can account for the magnitude and angular scale of this feature.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 19:36:22 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Whiting",
"Catherine A.",
""
],
[
"Spangler",
"Steven R.",
""
],
[
"Ingleby",
"Laura D.",
""
],
[
"Haffner",
"L. Matthew",
""
]
] | [
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802.0482 | Samira Bahrami | Samira Bahrami and Sadolah Nasiri | Symmetry Transformation in Extended Phase Space: the Harmonic Oscillator
in the Husimi Representation | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4 (2008), 014, 7 pages | 10.3842/SIGMA.2008.014 | null | quant-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | In a previous work the concept of quantum potential is generalized into
extended phase space (EPS) for a particle in linear and harmonic potentials. It
was shown there that in contrast to the Schr\"odinger quantum mechanics by an
appropriate extended canonical transformation one can obtain the Wigner
representation of phase space quantum mechanics in which the quantum potential
is removed from dynamical equation. In other words, one still has the form
invariance of the ordinary Hamilton-Jacobi equation in this representation. The
situation, mathematically, is similar to the disappearance of the centrifugal
potential in going from the spherical to the Cartesian coordinates. Here we
show that the Husimi representation is another possible representation where
the quantum potential for the harmonic potential disappears and the modified
Hamilton-Jacobi equation reduces to the familiar classical form. This happens
when the parameter in the Husimi transformation assumes a specific value
corresponding to $Q$-function.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 19:41:15 GMT"
}
] | 2008-04-25T00:00:00 | [
[
"Bahrami",
"Samira",
""
],
[
"Nasiri",
"Sadolah",
""
]
] | [
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802.0483 | Bernardo Huberman | Fang Wu and Bernardo A. Huberman | Popularity, Novelty and Attention | null | null | null | null | cs.CY | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the role that popularity and novelty play in attracting the
attention of users to dynamic websites. We do so by determining the performance
of three different strategies that can be utilized to maximize attention. The
first one prioritizes novelty while the second emphasizes popularity. A third
strategy looks myopically into the future and prioritizes stories that are
expected to generate the most clicks within the next few minutes. We show that
the first two strategies should be selected on the basis of the rate of novelty
decay, while the third strategy performs sub-optimally in most cases. We also
demonstrate that the relative performance of the first two strategies as a
function of the rate of novelty decay changes abruptly around a critical value,
resembling a phase transition in the physical world. 1
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 19:46:09 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Wu",
"Fang",
""
],
[
"Huberman",
"Bernardo A.",
""
]
] | [
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] |
802.0484 | Ali Ayazi | Ali Ayazi, and Bahram Jalali | Silicon Resonant Antenna | 3 pages, 4 figures | null | null | null | physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The need for high data rate communication systems has been dramatically
increasing in recent years. The millimeter-wave bands (such as 60 GHz) have
been investigated for wireless high data rate transmission. At these
frequencies, the conductor loss is significant which makes dielectric resonator
antenna (DRA) a good replacement for microstrip patch antennas currently in
use. Moreover, use of silicon as the dielectric material in a DRA provides the
great feature of bandwidth tunability through carrier density modulation. In
this paper, we present experimental and theoretical studies of antennas made
from silicon.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:07:01 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Ayazi",
"Ali",
""
],
[
"Jalali",
"Bahram",
""
]
] | [
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] |
802.0485 | Steven Slotterback | Steven Slotterback, Masahiro Toiya, Leonard Goff, Jack F. Douglas,
Wolfgang Losert | Particle motion during the compaction of granular matter | 4 pages, 6 Figures, to be submitted to PRL | null | 10.1103/PhysRevLett.101.258001 | null | cond-mat.soft | http://creativecommons.org/licenses/publicdomain/ | We track particle motions in a granular material subjected to compaction
using a laser scattering based imaging method where compaction is achieved
through thermal cycling. Particle displacements in this jammed fluid correlate
strongly with rearrangments of the Voronoi cells defining the local spatial
partitioning about the particles, similar to previous observations of Rahman on
cooled liquids. Our observations provide further evidence of commonalities
between particle dynamics in granular matter close to jamming and supercooled
liquids.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:23:35 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Slotterback",
"Steven",
""
],
[
"Toiya",
"Masahiro",
""
],
[
"Goff",
"Leonard",
""
],
[
"Douglas",
"Jack F.",
""
],
[
"Losert",
"Wolfgang",
""
]
] | [
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] |
802.0486 | Joshua M. Deutsch | J.M. Deutsch | Exact Solution to Ideal Chain with Fixed Angular Momentum | 9 pages, 2 figures | null | 10.1103/PhysRevE.77.051804 | null | cond-mat.stat-mech cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The statistical mechanics of a non-interacting polymer chain in the limit of
a large number of monomers is considered when the total angular momentum, L, is
fixed. The radius of gyration for a ring polymer in this situation is derived
exactly in closed form by functional integration techniques. Even when L = 0
the radius of gyration differs from that of a random walk by a prefactor of
order unity. The dependence on L is discussed qualitatively and the large L
limit can be understood by physical arguments.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:27:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Deutsch",
"J. M.",
""
]
] | [
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802.0487 | Marius Zimand | Cristian Calude, Marius Zimand | Algorithmically independent sequences | null | null | null | null | cs.IT cs.SE math.AG math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two objects are independent if they do not affect each other. Independence is
well-understood in classical information theory, but less in algorithmic
information theory. Working in the framework of algorithmic information theory,
the paper proposes two types of independence for arbitrary infinite binary
sequences and studies their properties. Our two proposed notions of
independence have some of the intuitive properties that one naturally expects.
For example, for every sequence $x$, the set of sequences that are independent
(in the weaker of the two senses) with $x$ has measure one. For both notions of
independence we investigate to what extent pairs of independent sequences, can
be effectively constructed via Turing reductions (from one or more input
sequences). In this respect, we prove several impossibility results. For
example, it is shown that there is no effective way of producing from an
arbitrary sequence with positive constructive Hausdorff dimension two sequences
that are independent (even in the weaker type of independence) and have
super-logarithmic complexity. Finally, a few conjectures and open questions are
discussed.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:32:07 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Calude",
"Cristian",
""
],
[
"Zimand",
"Marius",
""
]
] | [
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] |
802.0488 | Alastair Kay | Alastair Kay and Dimitris G. Angelakis | Reproducing spin lattice models in strongly coupled atom-cavity systems | 4 pages, 3 figures. v3: References added | Euro Phys. Lett. 84, 20001 (2008) | 10.1209/0295-5075/84/20001 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an array of coupled cavities where the cavities are doped with an atomic
V-system, and the two excited levels couple to cavity photons of different
polarizations, we show how to construct various spin models employed in
characterizing phenomena in condensed matter physics, such as the spin-1/2
Ising, XX, Heisenberg, and XXZ models. The ability to construct networks of
arbitrary geometry also allows for the simulation of topological effects. By
tuning the number of excitations present, the dimension of the spin to be
simulated can be controlled, and mixtures of different spin types produced. The
facility of single-site addressing, the use of only the natural hopping photon
dynamics without external fields, and the recent experimental advances towards
strong coupling, makes the prospect of using these arrays as efficient quantum
simulators promising.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:46:29 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 10:49:22 GMT"
},
{
"version": "v3",
"created": "Sun, 2 Mar 2008 20:28:07 GMT"
},
{
"version": "v4",
"created": "Tue, 30 Sep 2008 07:08:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kay",
"Alastair",
""
],
[
"Angelakis",
"Dimitris G.",
""
]
] | [
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] |
802.0489 | Jean-Marc Bardet | Jean-Marc Bardet (SAMM), Donatas Surgailis | Measuring the roughness of random paths by increment ratios | null | null | null | null | math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A statistic based on increment ratios (IR) and related to zero crossings of
increment sequence is defined and studied for measuring the roughness of random
paths. The main advantages of this statistic are robustness to smooth additive
and multiplicative trends and applicability to infinite variance processes. The
existence of the IR statistic limit (called the IR-roughness below) is closely
related to the existence of a tangent process. Three particular cases where the
IR-roughness exists and is explicitly computed are considered. Firstly, for a
diffusion process with smooth diffusion and drift coefficients, the
IR-roughness coincides with the IR-roughness of a Brownian motion and its
convergence rate is obtained. Secondly, the case of rough Gaussian processes is
studied in detail under general assumptions which do not require stationarity
conditions. Thirdly, the IR-roughness of a L\'evy process with $\alpha-$stable
tangent process is established and can be used to estimate the fractional
parameter $\alpha \in (0,2)$ following a central limit theorem.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:38:03 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Aug 2009 17:04:33 GMT"
},
{
"version": "v3",
"created": "Mon, 31 May 2010 08:27:57 GMT"
}
] | 2010-07-26T00:00:00 | [
[
"Bardet",
"Jean-Marc",
"",
"SAMM"
],
[
"Surgailis",
"Donatas",
""
]
] | [
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] |
802.049 | Yohan Dubois | Y. Dubois, R. Teyssier | Cosmological MHD simulation of a cooling flow cluster | 4 pages, 6 figures, to be published in A&A, correction in one
reference | null | 10.1051/0004-6361:200809513 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various observations of magnetic fields in the Intra-Cluster Medium (ICM),
most of the time restricted to cluster cores, point towards field strength of
the order of a few microG (synchrotron radiation from radio relics and radio
halos, inverse Compton radiation in X-rays and Faraday rotation measure of
polarised background sources). Both the origin and the spatial structure of
galaxy clusters magnetic fields are still under debate. In particular, the
radial profile of the magnetic field, from the core of clusters to their
outskirts, is of great importance for cosmic rays propagation within the Cosmic
Web. In this letter, we highlight the importance of cooling processes in
amplifying the magnetic field in the core of galaxy clusters up to one order of
magnitude above the typical amplification obtained for a pure adiabatic
evolution. We have performed a "zoom'' cosmological simulation of a 3 keV
cluster, including dark matter and gas dynamics, atomic cooling, UV heating and
star formation using the newly developed MHD solver in the AMR code RAMSES.
Magnetic field amplification proceeds mainly through gravitational contraction.
Shearing motions due to turbulence provide additional amplification in the
outskirts of the cluster, while magnetic reconnection during mergers causes
magnetic field dissipation in the core. Cooling processes have a strong impact
on the magnetic field structure in the cluster. First, due to the sharp rise of
the gas density in the centre, gravitational amplification is significantly
amplified, when compared to the non--radiative run. Second, due to cooling
processes, shearing motions are much stronger in the core than in the adiabatic
case, leading to additional field amplification and no significant magnetic
reconnection.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:38:41 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Mar 2008 16:48:44 GMT"
},
{
"version": "v3",
"created": "Mon, 31 Mar 2008 09:24:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dubois",
"Y.",
""
],
[
"Teyssier",
"R.",
""
]
] | [
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] |
802.0491 | Jiajun Xu | Rachel Bean, Xingang Chen, Girma Hailu, S.-H. Henry Tye, Jiajun Xu | Duality Cascade in Brane Inflation | Corrections in Eq.(5.47), Eq (5.48), Eq(5.49) and Fig 4 | JCAP 0803:026,2008 | 10.1088/1475-7516/2008/03/026 | null | hep-th astro-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that brane inflation is very sensitive to tiny sharp features in
extra dimensions, including those in the potential and in the warp factor. This
can show up as observational signatures in the power spectrum and/or
non-Gaussianities of the cosmic microwave background radiation (CMBR). One
general example of such sharp features is a succession of small steps in a
warped throat, caused by Seiberg duality cascade using gauge/gravity duality.
We study the cosmological observational consequences of these steps in brane
inflation. Since the steps come in a series, the prediction of other steps and
their properties can be tested by future data and analysis. It is also possible
that the steps are too close to be resolved in the power spectrum, in which
case they may show up only in the non-Gaussianity of the CMB temperature
fluctuations and/or EE polarization. We study two cases. In the slow-roll
scenario where steps appear in the inflaton potential, the sensitivity of brane
inflation to the height and width of the steps is increased by several orders
of magnitude comparing to that in previously studied large field models. In the
IR DBI scenario where steps appear in the warp factor, we find that the
glitches in the power spectrum caused by these sharp features are generally
small or even unobservable, but associated distinctive non-Gaussianity can be
large. Together with its large negative running of the power spectrum index,
this scenario clearly illustrates how rich and different a brane inflationary
scenario can be when compared to generic slow-roll inflation. Such distinctive
stringy features may provide a powerful probe of superstring theory.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:39:09 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 04:11:10 GMT"
},
{
"version": "v3",
"created": "Thu, 3 Mar 2011 19:35:58 GMT"
}
] | 2011-03-04T00:00:00 | [
[
"Bean",
"Rachel",
""
],
[
"Chen",
"Xingang",
""
],
[
"Hailu",
"Girma",
""
],
[
"Tye",
"S. -H. Henry",
""
],
[
"Xu",
"Jiajun",
""
]
] | [
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] |
802.0492 | Jeremy Drake | Jeremy J. Drake, Barbara Ercolano | On the Detectability of Oxygen X-ray Fluorescence and its Use as a Solar
Photospheric Abundance Diagnostic | To appear in the Astrophysical Journal | null | 10.1086/588008 | null | astro-ph | null | Monte Carlo calculations of the O Kalpha line fluoresced by coronal X-rays
and emitted just above the temperature minimum region of the solar atmosphere
have been employed to investigate the use of this feature as an abundance
diagnostic. While quite weak, we estimate line equivalent widths in the range
0.02-0.2 AA, depending on the X-ray plasma temperature. The line remains
essentially uncontaminated by blends for coronal temperatures T =< 3e6 K and
should be quite observable, with a flux >~ 2 ph/s/arcmin^2. Model calculations
for solar chemical mixtures with an O abundance adjusted up and down by a
factor of 2 indicate 35-60% changes in O Kalpha line equivalent width,
providing a potentially useful O abundance diagnostic. Sensitivity of
equivalent width to differences between recently recommended chemical
compositions with ``high'' and ``low'' complements of the CNO trio important
for interpreting helioseismological observations is less accute, amounting to
20-26% at coronal temperatures T ~< 2e6 K. While still feasible for
discriminating between these two mixtures, uncertainties in measured line
equivalent widths and in the models used for interpretation would need to be
significantly less than 20%. Provided a sensitive X-ray spectrometer with
resolving power >= 1000 and suitably well-behaved instrumental profile can be
built, X-ray fluorescence presents a viable means for resolving the solar
``oxygen crisis''.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 20:57:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Drake",
"Jeremy J.",
""
],
[
"Ercolano",
"Barbara",
""
]
] | [
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] |
802.0493 | Martin A. Guerrero | Martin A. Guerrero (1), and You-Hua Chu (2) ((1) Instituto de
Astrofisica de Andalucia, Spain, (2) University of Illinois at
Urbana-Champaign, USA) | An X-ray Survey of Wolf-Rayet Stars in the Magellanic Clouds. II. The
ROSAT PSPC and HRI Datasets | To appear in The Astrophysical Journal Supplement. A version with
full resolution figures can be obtained upon request to [email protected] | null | 10.1086/587060 | null | astro-ph | null | Wolf-Rayet (WR) stars in the Magellanic Clouds (MCs) are ideal for studying
the production of X-ray emission by their strong fast stellar winds. We have
started a systematic survey for X-ray emission from WR stars in the MCs using
archival Chandra, ROSAT, and XMM-Newton observations. In Paper I, we reported
the detection of X-ray emission from 29 WR stars using Chandra ACIS
observations of 70 WR stars in the MCs. In this paper, we report the search and
analysis of archival ROSAT PSPC and HRI observations of WR stars. While useful
ROSAT observations are available for 117 WR stars in the MCs, X-ray emission is
detected from only 7 of them. The detection rate of X-ray emission from MCs WR
stars in the ROSAT survey is much smaller than in the Chandra ACIS survey,
illustrating the necessity of high angular resolution and sensitivity. LMC-WR
101-102 and 116 were detected by both ROSAT and Chandra, but no large long-term
variations are evident.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:44:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Guerrero",
"Martin A.",
""
],
[
"Chu",
"You-Hua",
""
]
] | [
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] |
802.0494 | Fernando Camilo | F. Camilo (1), J. Reynolds (2), S. Johnston (2), J. P. Halpern (1), S.
M. Ransom (3) ((1) Columbia University, (2) ATNF, (3) NRAO) | The magnetar 1E 1547.0-5408: radio spectrum, polarimetry, and timing | Accepted for publication in ApJ (7 pages, including 6 figures) | null | 10.1086/587054 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the radio emission from the anomalous X-ray pulsar 1E
1547.0-5408 (PSR J1550-5418) using the Parkes telescope and the Australia
Telescope Compact Array. The flux density of the pulsar is roughly the same
between 1.4 and 45 GHz, but shows time variability. The radiation is nearly
100% linearly polarized between frequencies of 45 and 3.2 GHz, but from 2.3 to
1.4 GHz it becomes increasingly more depolarized. The rotation measure of -1860
rad/m^2 is the largest for any known pulsar, and implies an average magnetic
field strength along the line of sight of 2.7 microG. The pulse profiles are
circularly polarized at all frequencies observed, more so at lower frequencies,
at the ~15% level. The observed swing of the position angle of linear
polarization as a function of pulse phase suggests that in this neutron star
the rotation and magnetic axes are nearly aligned, and that its radio emission
is only detectable within a small solid angle. Timing measurements indicate
that the period derivative of this 2 s pulsar has increased by nearly 40% in a
6-month period. The flat spectrum and variability in flux density and pulse
profiles are reminiscent of the properties of XTE J1810-197, the only other
known radio-emitting magnetar, and are anomalous by comparison with those of
ordinary radio pulsars.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:00:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Camilo",
"F.",
"",
"Columbia University"
],
[
"Reynolds",
"J.",
"",
"ATNF"
],
[
"Johnston",
"S.",
"",
"ATNF"
],
[
"Halpern",
"J. P.",
"",
"Columbia University"
],
[
"Ransom",
"S. M.",
"",
"NRAO"
]
] | [
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] |
802.0495 | Dimitri Alexei Gadotti | Dimitri A. Gadotti (Max Planck Institute for Astrophysics) | Barred Galaxies: an Observer's Perspective | 13 pages, 4 figures; invited review to be published in "Chaos in
Astronomy", G. Contopoulos, P.A. Patsis (eds.) | null | 10.1007/978-3-540-75826-6_15 | null | astro-ph | null | I review both well established and more recent findings on the properties of
bars, and their host galaxies, stemming from photometric and spectroscopic
observations, and discuss how these findings can be understood in terms of a
global picture of the formation and evolution of bars, keeping a connection
with theoretical developments. In particular, I show the results of a detailed
structural analysis of ~ 300 barred galaxies in the Sloan Digital Sky Survey,
providing physical quantities, such as bar length, ellipticity and boxyness,
and bar-to-total luminosity ratio, that can either be used as a solid basis on
which realistic models can be built, or be compared against more fundamental
theoretical results. I also show correlations that indicate that bars grow
longer, thinner and stronger with dynamical age, and that the growth of bars
and bulges is connected. Finally, I briefly discuss open questions and possible
directions for future research.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:21:14 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Gadotti",
"Dimitri A.",
"",
"Max Planck Institute for Astrophysics"
]
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802.0496 | Filippo Fraternali Dr | Filippo Fraternali (Bologna University) and James Binney (Oxford
University) | Accretion of gas onto nearby spiral galaxies | 11 pages, 6 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13071.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present evidence for cosmological gas accretion onto spiral galaxies in
the local universe. The accretion is seen through its effects on the dynamics
of the extra-planar neutral gas. The accretion rates that we estimate for two
nearby spiral galaxies are of the order of their star formation rates. Our
model shows that most of the extra-planar gas is produced by supernova feedback
(galactic fountain) and only 10-20 % comes from accretion. The accreting
material must have low specific angular momentum about the disc's spin axis,
although the magnitude of the specific angular-momentum vector can be higher.
We also explore the effects of a hot corona on the dynamics of the extra-planar
gas and find that it is unlikely to be responsible for the observed kinematical
pattern and the source of accreted gas. However, the interaction with the
fountain flow should profoundly affect the hydrodynamics of the corona.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:00:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fraternali",
"Filippo",
"",
"Bologna University"
],
[
"Binney",
"James",
"",
"Oxford\n University"
]
] | [
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] |
802.0497 | Simon Dye | Simon Dye, S. A. Eales, I. Aretxaga, S. Serjeant, J. S. Dunlop, T. S.
R. Babbedge, S. C. Chapman, M. Cirasuolo, D. L. Clements, K. E. K. Coppin, L.
Dunne, E. Egami, D. Farrah, R. J. Ivison, E. van Kampen, A. Pope, R. Priddey,
G. H. Rieke, A. M. Schael, D. Scott, C. Simpson, T. Takagi, T. Takata, M.
Vaccari | The SCUBA HAlf Degree Extragalactic Survey (SHADES) - VII. Optical/IR
photometry and stellar masses of sub-millimeter galaxies | 27 pages, 23 figures. Refereed resubmission to MNRAS. 5 figures
containing postage stamp images have been placed in separate files due to
upload limit | null | 10.1111/j.1365-2966.2008.13113.x | null | astro-ph | null | We present estimates of the photometric redshifts, stellar masses and star
formation histories of sources in the SCUBA HAlf Degree Extragalactic Survey
(SHADES). This paper describes the 60 SCUBA sources detected in the Lockman
Hole covering an area of ~320 square arcmin. Using photometry spanning the B
band to 8um, we find that the average SCUBA source forms a significant fraction
of its stars in an early period of star formation and that most of the
remainder forms in a shorter more intense burst around the redshift it is
observed. This trend does not vary significantly with source redshift but the
exact ratio of early to late mass is quite sensitive to the way extinction is
treated in the modelling. However, the sources show a clear increase in stellar
mass with redshift, consistent with downsizing. In terms of SED types, only two
out of the 51 sources we have obtained photometric redshifts for are best fit
by a quasar-like spectral energy distribution, with approximately 80 per cent
of the sources being best fit with late-type spectra (Sc, Im and starburst). By
including photometry at 850um, we conclude that the average SCUBA source is
forming stars at a rate somewhere between 6 and 30 times the rate implied from
the rest-frame optical in a dust obscured burst and that this burst creates
15-65 per cent of the total stellar mass. Using a simplistic calculation, we
estimate from the average star formation history that between one in five and
one in 15 bright (L_* +2 mag < L_optical < L_* -1 mag) galaxies in the field
over the interval 0 < z < 3 will at some point in their lifetime experience a
similar energetic dusty burst of star formation. Finally, we compute the
evolution of the star formation rate density and find it peaks around z=2.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:27:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dye",
"Simon",
""
],
[
"Eales",
"S. A.",
""
],
[
"Aretxaga",
"I.",
""
],
[
"Serjeant",
"S.",
""
],
[
"Dunlop",
"J. S.",
""
],
[
"Babbedge",
"T. S. R.",
""
],
[
"Chapman",
"S. C.",
""
],
[
"Cirasuolo",
"M.",
""
],
[
"Clements",
"D. L.",
""
],
[
"Coppin",
"K. E. K.",
""
],
[
"Dunne",
"L.",
""
],
[
"Egami",
"E.",
""
],
[
"Farrah",
"D.",
""
],
[
"Ivison",
"R. J.",
""
],
[
"van Kampen",
"E.",
""
],
[
"Pope",
"A.",
""
],
[
"Priddey",
"R.",
""
],
[
"Rieke",
"G. H.",
""
],
[
"Schael",
"A. M.",
""
],
[
"Scott",
"D.",
""
],
[
"Simpson",
"C.",
""
],
[
"Takagi",
"T.",
""
],
[
"Takata",
"T.",
""
],
[
"Vaccari",
"M.",
""
]
] | [
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] |
802.0498 | Klaus Larjo | Vijay Balasubramanian, Klaus Larjo and Ravi Sheth | Experimental design and model selection: The example of exoplanet
detection | 12 pages, 2 figures; To appear in the Festschrift for Jorma Rissanen;
UPR-1187 | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the Minimum Description Length model selection approach to the
detection of extra-solar planets, and use this example to show how
specification of the experimental design affects the prior distribution on the
model parameter space and hence the posterior likelihood which, in turn,
determines which model is regarded as most `correct'. Our analysis shows how
conditioning on the experimental design can render a non-compact parameter
space effectively compact, so that the MDL model selection problem becomes
well-defined.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:01:05 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Balasubramanian",
"Vijay",
""
],
[
"Larjo",
"Klaus",
""
],
[
"Sheth",
"Ravi",
""
]
] | [
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] |
802.0499 | Christopher S. Reynolds | Christopher S. Reynolds (Maryland), Elyse A. Casper, Sebastian Heinz
(Wisconsin) | A deep Chandra observation of Abell 4059: a new face to radio-mode AGN
feedback? | Accepted for publication in the Astrophysical Journal. 12 pages, 11
figures. A version of this paper including full resolution figures can be
found at http://www.astro.umd.edu/~chris/publications/papers/a4059_2008.pdf | null | 10.1086/587456 | null | astro-ph | null | A deep Chandra observation of the cooling core cluster Abell 4059 (A4059) is
presented. Previous studies have found two X-ray cavities in the central
regions of A4059 together with a ridge of X-ray emission 20kpc south-west of
the cluster center. These features are clearly related to the radio galaxy
PKS2354-35 which resides in the cD galaxy. Our new data confirm these previous
findings and strengthen previous suggestions that the south-western ridge is
colder and denser than, but in approximate pressure equilibrium with, the
surrounding ICM atmosphere. In addition, we find evidence for a weak shock that
wraps around the north and east sides of the cavity structure. Our data allow
us to map the 2-dimensional distribution of metals in the ICM of A4059 for the
first time. We find that the SW ridge possesses an anomalously high
(super-solar) metalicity. The unusual morphology, temperature structure and
metal distribution all point to significant asymmetry in the ICM atmosphere
prior to the onset of radio-galaxy activity. Motivated by the very high
metalicity of the SW ridge, we hypothesize that the ICM asymmetry was caused by
the extremely rapid stripping of metal enriched gas from a starburst galaxy
that plunged through the core of A4059. Furthermore, we suggest that the onset
of powerful radio-galaxy activity in the cD galaxy may have been initiated by
this starburst/stripping event, either via the tidal-shocking of cold gas
native to the cD galaxy, or the accretion of cold gas that had been stripped
from the starburst galaxy.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:05:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Reynolds",
"Christopher S.",
"",
"Maryland"
],
[
"Casper",
"Elyse A.",
"",
"Wisconsin"
],
[
"Heinz",
"Sebastian",
"",
"Wisconsin"
]
] | [
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] |
802.05 | Flavio S. Nogueira | Flavio S. Nogueira | Deconfined quantum criticality driven by Dirac fermions in SU(2)
antiferromagnets | 13 pages, 3 figures; published version | Phys. Rev. B 77, 195101 (2008) | 10.1103/PhysRevB.77.195101 | null | cond-mat.str-el hep-th | null | Quantum electrodynamics in 2+1 dimensions is an effective gauge theory for
the so called algebraic quantum liquids. A new type of such a liquid, the
algebraic charge liquid, has been proposed recently in the context of
deconfined quantum critical points [R. K. Kaul {\it et al.}, Nature Physics
{\bf 4}, 28 (2008)]. In this context, we show by using the renormalization
group in $d=4-\epsilon$ spacetime dimensions, that a deconfined quantum
critical point occurs in a SU(2) system provided the number of Dirac fermion
species $N_f\geq 4$. The calculations are done in a representation where the
Dirac fermions are given by four-component spinors. The critical exponents are
calculated for several values of $N_f$. In particular, for $N_f=4$ and
$\epsilon=1$ ($d=2+1$) the anomalous dimension of the N\'eel field is given by
$\eta_N=1/3$, with a correlation length exponent $\nu=1/2$. These values change
considerably for $N_f>4$. For instance, for $N_f=6$ we find $\eta_N\approx
0.75191$ and $\nu\approx 0.66009$. We also investigate the effect of chiral
symmetry breaking and analyze the scaling behavior of the chiral holon
susceptibility, $G_\chi(x)\equiv<\bar \psi(x)\psi(x)\bar \psi(0)\psi(0)>$.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:01:23 GMT"
},
{
"version": "v2",
"created": "Sun, 10 Feb 2008 12:22:33 GMT"
},
{
"version": "v3",
"created": "Tue, 6 May 2008 09:40:20 GMT"
}
] | 2008-05-06T00:00:00 | [
[
"Nogueira",
"Flavio S.",
""
]
] | [
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] |
802.0501 | Rima Stonkute | Rima Stonkute (1), Vladas Vansevicius (1), Nobuo Arimoto (2 and 3),
Takashi Hasegawa (4), Donatas Narbutis (1), Naoyuki Tamura (5), Pascale
Jablonka (6), Kouji Ohta (7) and Yoshihiko Yamada (2) ((1) Inst. of Phys.,
Lithuania, (2) Nat. Astr. Obs. of Japan, (3) Dept. of Astr. Grad. Univ. of
Adv. Studies, Japan, (4) Gunma AO, Japan, (5) Subaru Tel. Obs., Japan (6)
Univ. de Geneve, Switzerland, (7) Kyoto Univ., Japan) | An extended star cluster at the outer edge of the spiral galaxy M33 | 20 pages, 6 figures, 2 tables, accepted for publication in AJ | null | 10.1088/0004-6256/135/4/1482 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report a discovery of an extended globular-like star cluster, M33-EC1, at
the outer edge of the spiral galaxy M33. The distance to the cluster is 890
kpc, and it lies at a 12.5 kpc projected distance from the center of M33. Old
age (>~7 Gyr) and low metallicity ([M/H] <~ -1.4) are estimated on the basis of
isochrone fits. Color-magnitude diagrams of stars, located in the cluster's
area, photometric and structural parameters of the cluster are presented.
Cluster's luminosity (M_V = -6.6) and half-light radius (r_h = 20.3 pc) are
comparable to those of the extended globular clusters, discovered in more
luminous Local Group galaxies, the Milky Way and M31. Extended globular
clusters are suspected to be remnants of accreted dwarf galaxies, and the
finding of such a cluster in the late-type dwarf spiral galaxy M33 would imply
a complex merging history in the past.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:02:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stonkute",
"Rima",
"",
"2 and 3"
],
[
"Vansevicius",
"Vladas",
"",
"2 and 3"
],
[
"Arimoto",
"Nobuo",
"",
"2 and 3"
],
[
"Hasegawa",
"Takashi",
""
],
[
"Narbutis",
"Donatas",
""
],
[
"Tamura",
"Naoyuki",
""
],
[
"Jablonka",
"Pascale",
""
],
[
"Ohta",
"Kouji",
""
],
[
"Yamada",
"Yoshihiko",
""
]
] | [
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] |
802.0502 | Christopher Withers | Christopher S. Withers and Saralees Nadarajah | Fredholm equations for non-symmetric kernels, with applications to
iterated integral operators | 12 A4 pages | null | null | null | math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give the Jordan form and the Singular Value Decomposition for an integral
operator ${\cal N}$ with a non-symmetric kernel $N(y,z)$. This is used to give
solutions of Fredholm equations for non-symmetric kernels, and to determine the
behaviour of ${\cal N}^n$ and $({\cal N}{\cal N^*})^n$ for large $n$.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:07:24 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Apr 2008 04:08:08 GMT"
}
] | 2008-04-02T00:00:00 | [
[
"Withers",
"Christopher S.",
""
],
[
"Nadarajah",
"Saralees",
""
]
] | [
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