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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.0398 | Andrei Gritsan | The BABAR Collaboration, B. Aubert, et al | Search for B0->phiK+pi- Decays with Large K+pi- Invariant Mass | 8 pages, 8 postscript figues, submitted to Phys. Rev. D (Rapid
Communications) | Phys.Rev.D76:051103,2007 | 10.1103/PhysRevD.76.051103 | BABAR-PUB-00/023, SLAC-PUB-12461 | hep-ex | null | Motivated by the polarization anomaly in the B->phi(1020)K*(892) decay, we
extend our search for other K* final states in the decay B0->phi(1020)K^*0 with
the K*0->K+pi- invariant mass above 1.6 GeV. The final states considered
include the K*(1680)0, K3*(1780)0, K4*(2045)0, and a Kpi spin-zero nonresonant
component. We also search for B0->phiDbar0 decay with the same final state. The
analysis is based on a sample of about 384 million BBbar pairs recorded with
the BABAR detector. We place upper limits on the branching fractions
BR(B0->phiK*(1680)0)<3.5*10^-6, BR(B0->phiK3*(1780)0)<2.7*10^-6,
BR(B0->phiK4*(2045)0)<15.3*10^-6, and BR(B0->phiDbar0)<11.7*10^-6 at 90% C.L.
The nonresonant contribution is consistent with the measurements in the lower
invariant mass range.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 01:23:08 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0705.0399 | Xiao-Gang He | Shao-Long Chen, N. G. Deshpande, Xiao-Gang He, Jing Jiang, Lu-Hsing
Tsai | Spontaneous CP Violating Phase as The CKM Matrix Phase | 16 pages, RevTex. Several typos corrected, and one reference added | Eur.Phys.J.C53:607-614,2008 | 10.1140/epjc/s10052-007-0509-y | null | hep-ph hep-ex | null | We propose that the CP violating phase in the CKM mixing matrix is identical
to the CP phases responsible for the spontaneous CP violation in the Higgs
potential. A specific multi-Higgs model with Peccei-Quinn (PQ) symmetry is
constructed to realize this idea. The CP violating phase does not vanish when
all Higgs masses become large. There are flavor changing neutral current (FCNC)
interactions mediated by neutral Higgs bosons at the tree level. However,
unlike general multi-Higgs models, the FCNC Yukawa couplings are fixed in terms
of the quark masses and CKM mixing angles. Implications for meson-anti-meson
mixing, including recent data on $D-\bar D$ mixing, and neutron electric dipole
moment (EDM) are studied. We find that the neutral Higgs boson masses can be at
the order of one hundred GeV. The neutron EDM can be close to the present
experimental upper bound.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 01:31:34 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 05:03:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chen",
"Shao-Long",
""
],
[
"Deshpande",
"N. G.",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Jiang",
"Jing",
""
],
[
"Tsai",
"Lu-Hsing",
""
]
] |
0705.0400 | Roland de Putter | Roland de Putter and Eric V. Linder | Kinetic k-essence and Quintessence | 11 pages, 11 figures; v2 added references, matches Astropart. Phys.
version | Astropart.Phys.28:263-272,2007 | 10.1016/j.astropartphys.2007.05.011 | null | astro-ph hep-th | null | Dark energy models with non-canonical kinetic energy terms, k-essence, can
have dynamical and sound speed properties distinct from canonical scalar
fields, quintessence. Concentrating on purely kinetic term Lagrangians, which
can be technically natural, we investigate limits on the equation of state
dynamics and sound speed behaviors and the extent to which these models can be
separated from quintessence.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 01:39:24 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 20:57:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"de Putter",
"Roland",
""
],
[
"Linder",
"Eric V.",
""
]
] |
0705.0401 | Jiangping Hu | Jiangping Hu, Yiguang Hong | Leader-following coordination of multi-agent systems with coupling time
delays | 16 pages,5 figures | null | 10.1016/j.physa.2006.08.015 | null | math-ph math.MP | null | In this paper, we consider a leader-following consensus problem of a group of
autonomous agents with time-varying coupling delays. Two different cases of
coupling topologies are investigated. At first, a necessary and sufficient
condition is proved in the case when the interconnection topology is fixed and
directed. Then a sufficient condition is proposed in the case when the coupling
topology is switched and balanced. Numerical examples are also given to
illustrate our results.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 02:04:26 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Hu",
"Jiangping",
""
],
[
"Hong",
"Yiguang",
""
]
] |
0705.0402 | Gijs Roelofs | G.H.A. Roelofs, P.J. Groot, G. Nelemans (Nijmegen), T.R. Marsh
(Warwick) and D. Steeghs (CfA) | On the orbital periods of the AM CVn stars HP Librae and V803 Centauri | Accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.379:176-182,2007 | 10.1111/j.1365-2966.2007.11931.x | null | astro-ph | null | We analyse high-time-resolution spectroscopy of the AM CVn stars HP Librae
and V803 Centauri, taken with the New Technology Telescope (NTT) and the Very
Large Telescope (VLT) of the European Southern Observatory, Chile.
We present evidence that the literature value for V803 Cen's orbital period
is incorrect, based on an observed `S-wave' in the binary's spectrogram. We
measure a spectroscopic period P=1596.4+/-1.2s of the S-wave feature, which is
significantly shorter than the 1611-second periods found in previous
photometric studies. We conclude that the latter period likely represents a
`superhump'. If one assumes that our S-wave period is the orbital period, V803
Cen's mass ratio can be expected to be much less extreme than previously
thought, at q~0.07 rather than q~0.016. This relaxes the constraints on the
masses of the components considerably: the donor star does then not need to be
fully degenerate, and the mass of the accreting white dwarf no longer has to be
very close to the Chandrasekhar limit.
For HP Lib, we similarly measure a spectroscopic period P=1102.8+/-0.2s. This
supports the identification of HP Lib's photometric periods found in the
literature, and the constraints upon the masses derived from them.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 02:20:29 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Roelofs",
"G. H. A.",
"",
"Nijmegen"
],
[
"Groot",
"P. J.",
"",
"Nijmegen"
],
[
"Nelemans",
"G.",
"",
"Nijmegen"
],
[
"Marsh",
"T. R.",
"",
"Warwick"
],
[
"Steeghs",
"D.",
"",
"CfA"
]
] |
0705.0403 | Jiangping Hu | Jiangping Hu, Yiguang Hong, Linxin Gao | Tracking control for multi-agent consensus with an active leader and
variable topology | 6 pages | null | 10.1016/j.automatica.2006.02.013 | null | math-ph math.MP | null | In this paper, we consider the coordination control of a group of autonomous
mobile agents with multiple leaders. Different interconnection topologies are
investigated. At first, a necessary and sufficient condition is proved in the
case of fixed interconnection topology. Then a sufficient condition is proposed
when the interconnection topology is switched. With a simple first-order
dynamics model by using the neighborhood rule, both results show that the group
behavior of the agents will converge to the polytope formed by the leaders.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 02:14:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hu",
"Jiangping",
""
],
[
"Hong",
"Yiguang",
""
],
[
"Gao",
"Linxin",
""
]
] |
0705.0404 | N. D. Ramesh Bhat | N. D. Ramesh Bhat, Randall B. Wayth, Haydon S. Knight, Judd D. Bowman,
Divya Oberoi, David G. Barnes, Frank H. Briggs, Roger J. Cappallo, David
Herne, Jonathon Kocz, Colin J. Lonsdale, Mervyn J. Lynch, Bruce Stansby,
Jamie Stevens, Glen Torr, Rachel L. Webster, J. Stuart B. Wyithe | Detection of Crab Giant Pulses Using the Mileura Widefield Array Low
Frequency Demonstrator Field Prototype System | 10 pages, 6 figures, Accepted for publication in the Astrophysical
Journal | Astrophys.J.665:618-627,2007 | 10.1086/519444 | null | astro-ph | null | We report on the detection of giant pulses from the Crab Nebula pulsar at a
frequency of 200 MHz using the field deployment system designed for the Mileura
Widefield Array's Low Frequency Demonstrator (MWA-LFD). Our observations are
among the first high-quality detections at such low frequencies. The measured
pulse shapes are deconvolved for interstellar pulse broadening, yielding a
pulse-broadening time of 670$\pm$100 $\mu$s, and the implied strength of
scattering (scattering measure) is the lowest that is estimated towards the
Crab nebula from observations made so far. The sensitivity of the system is
largely dictated by the sky background, and our simple equipment is capable of
detecting pulses that are brighter than $\sim$9 kJy in amplitude. The brightest
giant pulse detected in our data has a peak amplitude of $\sim$50 kJy, and the
implied brightness temperature is $10^{31.6}$ K. We discuss the giant pulse
detection prospects with the full MWA-LFD system. With a sensitivity over two
orders of magnitude larger than the prototype equipment, the full system will
be capable of detecting such bright giant pulses out to a wide range of
Galactic distances; from $\sim$8 to $\sim$30 kpc depending on the frequency.
The MWA-LFD will thus be a highly promising instrument for the studies of giant
pulses and other fast radio transients at low frequencies.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 03:07:05 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bhat",
"N. D. Ramesh",
""
],
[
"Wayth",
"Randall B.",
""
],
[
"Knight",
"Haydon S.",
""
],
[
"Bowman",
"Judd D.",
""
],
[
"Oberoi",
"Divya",
""
],
[
"Barnes",
"David G.",
""
],
[
"Briggs",
"Frank H.",
""
],
[
"Cappallo",
"Roger J.",
""
],
[
"Herne",
"David",
""
],
[
"Kocz",
"Jonathon",
""
],
[
"Lonsdale",
"Colin J.",
""
],
[
"Lynch",
"Mervyn J.",
""
],
[
"Stansby",
"Bruce",
""
],
[
"Stevens",
"Jamie",
""
],
[
"Torr",
"Glen",
""
],
[
"Webster",
"Rachel L.",
""
],
[
"Wyithe",
"J. Stuart B.",
""
]
] |
0705.0405 | Zongxia Liang | Zongxia Liang | Large deviations for multidimensional SDEs with reflection | 25 pages | null | null | null | math.PR | null | The large deviations principles are established for a class of
multidimensional degenerate stochastic differential equations with reflecting
boundary conditions. The results include two cases where the initial conditions
are adapted and anticipated.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 03:06:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Liang",
"Zongxia",
""
]
] |
0705.0406 | Yaroslaw Bazaliy | Ya. B. Bazaliy, D. Olaosebikan, B. A. Jones | Planar spin-transfer device with a dynamic polarizer | accepted to the Journal of Nanoscience and Nanotechnology | J. Nanosci. Nanoelectronics 8, 2891 (2008) | null | NSF-KITP-06-94 | cond-mat.mtrl-sci | null | In planar nano-magnetic devices magnetization direction is kept close to a
given plane by the large easy-plane magnetic anisotropy, for example by the
shape anisotropy in a thin film. In this case magnetization shows effectively
in-plane dynamics with only one angle required for its description. Moreover,
the motion can become overdamped even for small values of Gilbert damping. We
derive the equations of effective in-plane dynamics in the presence of
spin-transfer torques. The simplifications achieved in the overdamped regime
allow to study systems with several dynamic magnetic pieces (``free layers'').
A transition from a spin-transfer device with a static polarizer to a device
with two equivalent magnets is observed. When the size difference between the
magnets is less than critical, the device does not exhibit switching, but goes
directly into the ``windmill'' precession state.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:45:40 GMT"
}
] | 2009-06-24T00:00:00 | [
[
"Bazaliy",
"Ya. B.",
""
],
[
"Olaosebikan",
"D.",
""
],
[
"Jones",
"B. A.",
""
]
] |
0705.0407 | Reginald Little Sr | Reginald B. Little and Alexandru S. Biris | On the Dynamical Ferromagnetic, Quantum Hall, and Relativistic Effects
on the Carbon Nanotubes Nucleation and Growth Mechanism | null | null | 10.1016/j.jmmm.2007.07.031 | null | cond-mat.mtrl-sci cond-mat.mes-hall | null | The mechanism of carbon nanotube (CNT) nucleation and growth has been a
mystery for over 15 years. Prior models have attempted the extension of older
classical transport mechanisms. In July 2000, a more detailed and accurate
nonclassical, relativistic mechanism was formulated considering the detailed
dynamics of the electronics of spin and orbital rehybridization between the
carbon and catalyst via novel mesoscopic phenomena and quantum dynamics.
Ferromagnetic carbon was demonstrated. Here, quantum (Hall) effects and
relativistic effects of intense many body spin-orbital interactions for novel
orbital rehybridization dynamics (Little Effect) are proposed in this new
dynamical magnetic mechanism. This dynamic ferromagnetic mechanism is proven by
imposing dynamic and static magnetic fields during CNT syntheses and observing
the different influence of these external magnetic environments on the
catalyzing spin currents and spin waves and the resulting CNT formation.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 04:43:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Little",
"Reginald B.",
""
],
[
"Biris",
"Alexandru S.",
""
]
] |
0705.0408 | Nemanja Kaloper | Nemanja Kaloper, John Terning | How Black Holes Form in High Energy Collisions | 8 pages, 3 .eps figures, essay | Int.J.Mod.Phys.D17:665-672,2008; Gen.Rel.Grav.39:1525-1532,2007 | 10.1007/s10714-007-0468-5 10.1142/S0218271808012413 | null | hep-th astro-ph gr-qc hep-ph | null | We elucidate how black holes form in trans-Planckian collisions. In the rest
frame of one of the incident particles, the gravitational field of the other,
which is rapidly moving, looks like a gravitational shock wave. The shock wave
focuses the target particle down to a much smaller impact parameter. In turn,
the gravitational field of the target particle captures the projectile when the
resultant impact parameter is smaller than its own Schwarzschild radius,
forming a black hole. One can deduce this by referring to the original argument
of escape velocities exceeding the speed of light, which Michell and Laplace
used to discover the existence of black holes.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 04:54:22 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Kaloper",
"Nemanja",
""
],
[
"Terning",
"John",
""
]
] |
0705.0409 | Guang-Yu Guo | G. Y. Guo, S. Murakami, T.-W. Chen, N. Nagaosa | Intrinsic spin Hall effect in platinum metal | Accepted for publication in Phys. Rev. Lett | Phys. Rev. Lett. 100, 096401 (2008) | 10.1103/PhysRevLett.100.096401 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Spin Hall effect in metallic Pt is studied with first-principles relativistic
band calculations. It is found that intrinsic spin Hall conductivity (SHC) is
as large as $\sim 2000 (\hbar/e)(\Omega {\rm cm})^{-1}$ at low temperature, and
decreases down to $\sim 200 (\hbar/e)(\Omega {\rm cm})^{-1}$ at room
temperature. It is due to the resonant contribution from the spin-orbit
splitting of the doubly degenerated $d$-bands at high-symmetry $L$ and $X$
points near the Fermi level. By modeling these near degeneracies by effective
Hamiltonian, we show that SHC has a peak near the Fermi energy and that the
vertex correction due to impurity scattering vanishes. We therefore argue that
the large spin Hall effect observed experimentally in platinum is of intrinsic
nature.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 05:23:10 GMT"
},
{
"version": "v2",
"created": "Fri, 11 May 2007 11:00:42 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Jul 2007 05:34:14 GMT"
},
{
"version": "v4",
"created": "Sun, 10 Feb 2008 10:05:05 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Guo",
"G. Y.",
""
],
[
"Murakami",
"S.",
""
],
[
"Chen",
"T. -W.",
""
],
[
"Nagaosa",
"N.",
""
]
] |
0705.0410 | Sam Payne | Sam Payne | Moduli of toric vector bundles | 16 pages. v2: corrected inconsistencies in sign conventions, other
minor changes. To appear in Compos. Math | Compositio Math. 144 (2008), 1199--1213. | 10.1112/S0010437X08003461 | null | math.AG | null | We give a presentation of the moduli stack of toric vector bundles with fixed
equivariant total Chern class as a quotient of a fine moduli scheme of framed
bundles by a linear group action. This fine moduli scheme is described
explicitly as a locally closed subscheme of a product of partial flag varieties
cut out by combinatorially specified rank conditions. We use this description
to show that the moduli of rank three toric vector bundles satisfy Murphy's
Law, in the sense of Vakil. The preliminary sections of the paper give a
self-contained introduction to Klyachko's classification of toric vector
bundles.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 05:41:52 GMT"
},
{
"version": "v2",
"created": "Sat, 19 Apr 2008 02:36:23 GMT"
}
] | 2014-01-14T00:00:00 | [
[
"Payne",
"Sam",
""
]
] |
0705.0411 | Anthony Weston | Ian Doust, Anthony Weston | Enhanced negative type for finite metric trees | 35 pages, no figures. This is the final version of this paper sans
diagrams. Please note the corrected statement of Theorem 4.16 (and hence
inequality (1)). A scaling factor was omitted in Version #1 | J. Funct. Anal., 254 (2008), 2336-2364 | 10.1016/j.jfa.2008.01.013 | null | math.FA math.MG | null | Finite metric trees are known to have strict 1-negative type. In this paper
we introduce a new family of inequalities that quantify the extent of the
"strictness" of the 1-negative type inequalities for finite metric trees. These
inequalities of "enhanced 1-negative type" are sufficiently strong to imply
that any given finite metric tree must have strict p-negative type for all
values of p in an open interval that contains the number 1. Moreover, these
open intervals can be characterized purely in terms of the unordered
distribution of edge weights that determine the path metric on the particular
tree, and are therefore largely independent of the tree's internal geometry.
From these calculations we are able to extract a new non linear technique for
improving lower bounds on the maximal p-negative type of certain finite metric
spaces. Some pathological examples are also considered in order to stress
certain technical points.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 06:17:03 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Mar 2008 15:45:35 GMT"
}
] | 2015-09-07T00:00:00 | [
[
"Doust",
"Ian",
""
],
[
"Weston",
"Anthony",
""
]
] |
0705.0412 | Noboru Ito | Noboru Ito | Invariants via word for curves and fronts | 26pages | null | null | null | math.GT | null | We construct the infinite sequence of invariants for curves in surfaces by
using word theory that V. Turaev introduced. For plane closed curves, we add
some extra terms, e.g. the rotation number. From these modified invariants, we
get the Arnold's basic invariants and some other invariants. We also express
how these invariants classify plane closed curves. In addition, we consider
other classes of plane curves: long curves and fronts.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 06:06:00 GMT"
},
{
"version": "v2",
"created": "Tue, 8 May 2007 01:21:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ito",
"Noboru",
""
]
] |
0705.0413 | David Eppstein | David Eppstein, Marc van Kreveld, Elena Mumford, and Bettina Speckmann | Edges and Switches, Tunnels and Bridges | 15 pages, 11 figures. To appear in 10th Worksh. Algorithms and Data
Structures, Halifax, Nova Scotia, 2007. This version includes three pages of
appendices that will not be included in the conference proceedings version | Computational Geometry Theory & Applications 42(8): 790-802, 2009 | 10.1016/j.comgeo.2008.05.005 | null | cs.DS cs.CG | null | Edge casing is a well-known method to improve the readability of drawings of
non-planar graphs. A cased drawing orders the edges of each edge crossing and
interrupts the lower edge in an appropriate neighborhood of the crossing.
Certain orders will lead to a more readable drawing than others. We formulate
several optimization criteria that try to capture the concept of a "good" cased
drawing. Further, we address the algorithmic question of how to turn a given
drawing into an optimal cased drawing. For many of the resulting optimization
problems, we either find polynomial time algorithms or NP-hardness results.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 06:33:04 GMT"
}
] | 2009-07-09T00:00:00 | [
[
"Eppstein",
"David",
""
],
[
"van Kreveld",
"Marc",
""
],
[
"Mumford",
"Elena",
""
],
[
"Speckmann",
"Bettina",
""
]
] |
0705.0414 | Ashot Akopian A | A.A. Akopian | Determination of SNe explosions frequency distribution function.Method
and numerical simulations | null | null | null | null | astro-ph | null | The method for determination of the Supernovae (SNe) explosions frequency
distribution function based on the assumption of explosions independence are
offered. The method is based on assumption that the sequence of SNe explosions
in an individual galaxy is a Poisson sequence. The essence of the method is in
the determination of statistical moments of the frequency of the SNe explosions
and subsequent determination of distribution function . The program of
numerical simulation has been developed for testing the efficiency of the
method. Numerical simulations show that even for a small mean number of
registered SNe explosions, method allows restoring initial distribution
function. The results of numerical simulations are given.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 06:55:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Akopian",
"A. A.",
""
]
] |
0705.0415 | Peter Kleinert | V.V. Bryksin and P. Kleinert | Coupled spin-charge drift-diffusion equations for the Rashba model | 12 pages | null | null | null | cond-mat.mes-hall cond-mat.dis-nn | null | Coupled spin-charge drift-diffusion equations are derived for a biased
two-dimensional electron gas with weak Rashba spin-orbit interaction. The basic
equations formally agree with recent results obtained for spin-orbit coupled
small polarons. It is shown that effects of an in-plane electric field on a
homogeneous spin system can completely be described by an associated in-plane
magnetic field. Exploiting this analogy, we predict among other things the
electric-field equivalent of the Hanle effect.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 07:27:04 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bryksin",
"V. V.",
""
],
[
"Kleinert",
"P.",
""
]
] |
0705.0416 | Christine Noot-Huyghe | Christine Noot-Huyghe (IRMA), Fabien Trihan (UMH) | Sur l'holonomie de D-modules arithm\'etiques associ\'es \`a des
F-isocristaux surconvergents sur des courbes lisses | null | null | null | null | math.AG | null | We show that the arithmetic D-module associated to an overconvergent
F-isocrystal over a smooth curve is holonomic. We first prove that unipotent
F-isocrystals are holonomic D-module by using the fact that such F-isocrystals
come from logarithmic F-isocrystals. We deduce the general case from the
semi-stable theorem for F-isocrystals over curves of Matsuda-Trihan which
relies on the p-adic monodromy theorem independently proved by Andr\'e, Kedlaya
and Mebkhout. The main result has already been proved by D. Caro.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 07:03:22 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Jun 2007 19:44:42 GMT"
},
{
"version": "v3",
"created": "Thu, 5 Jul 2007 04:39:38 GMT"
}
] | 2007-07-05T00:00:00 | [
[
"Noot-Huyghe",
"Christine",
"",
"IRMA"
],
[
"Trihan",
"Fabien",
"",
"UMH"
]
] |
0705.0417 | Keiya Shirahama | Hanako Isshiki, Denis Konstantinov, Hikota Akimoto, Keiya Shirahama,
Kimitoshi Kono | Microwave Absorption of Surface-State Electrons on Liquid $^3$He | 15 pages, 7 figures, submitted to J. Phys. Soc. Jpn | null | 10.1143/JPSJ.76.094704 | null | cond-mat.mes-hall cond-mat.str-el | null | We have investigated the intersubband transitions of surface state electrons
(SSE) on liquid $^3$He induced by microwave radiation at temperatures from 1.1
K down to 0.01 K. Above 0.4 K, the transition linewidth is proportional to the
density of $^3$He vapor atoms. This proportionality is explained well by Ando's
theory, in which the linewidth is determined by the electron - vapor atom
scattering. However, the linewidth is larger than the calculation by a factor
of 2.1. This discrepancy strongly suggests that the theory underestimates the
electron - vapor atom scattering rate. At lower temperatures, the absorption
spectrum splits into several peaks. The multiple peak structure is partly
attributed to the spatial inhomogeneity of the static holding electric field
perpendicular to the electron sheet.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 07:43:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Isshiki",
"Hanako",
""
],
[
"Konstantinov",
"Denis",
""
],
[
"Akimoto",
"Hikota",
""
],
[
"Shirahama",
"Keiya",
""
],
[
"Kono",
"Kimitoshi",
""
]
] |
0705.0418 | Nathalie Villa | Nathalie Villa (GRIMM), Martin Paegelow (GEODE), Maria T. Camacho
Olmedo, Laurence Cornez (GEODE), Fr\'ed\'eric Ferraty (GRIMM), Louis Ferr\'e
(GRIMM), Pascal Sarda (GRIMM) | Various Approaches for Predicting Land Cover in Mountain Areas | 14 pages; Classifications: Information Theory; Probability Theory &
Applications; Statistical Computing; Statistical Theory & Methods | Communication in Statistics- Simulation and Computation /
Communications in Statistics Simulation and Computation 36, 1 (01/2007) 73-86 | 10.1080/03610910601096379 | null | stat.AP stat.ME | null | Using former maps, geographers intend to study the evolution of the land
cover in order to have a prospective approach on the future landscape;
predictions of the future land cover, by the use of older maps and
environmental variables, are usually done through the GIS (Geographic
Information System). We propose here to confront this classical geographical
approach with statistical approaches: a linear parametric model (polychotomous
regression modeling) and a nonparametric one (multilayer perceptron). These
methodologies have been tested on two real areas on which the land cover is
known at various dates; this allows us to emphasize the benefit of these two
statistical approaches compared to GIS and to discuss the way GIS could be
improved by the use of statistical models.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 07:12:47 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Villa",
"Nathalie",
"",
"GRIMM"
],
[
"Paegelow",
"Martin",
"",
"GEODE"
],
[
"Olmedo",
"Maria T. Camacho",
"",
"GEODE"
],
[
"Cornez",
"Laurence",
"",
"GEODE"
],
[
"Ferraty",
"Frédéric",
"",
"GRIMM"
],
[
"Ferré",
"Louis",
"",
"GRIMM"
],
[
"Sarda",
"Pascal",
"",
"GRIMM"
]
] |
0705.0419 | Luigi Santocanale | Walid Belkhir (LIF), Luigi Santocanale (LIF) | Undirected Graphs of Entanglement Two | null | FSTTCS 2007: Foundations of Software Technology and Theoretical
Computer Science, Inde (2007) | 10.1007/978-3-540-77050-3_42 | null | cs.LO cs.GT | null | Entanglement is a complexity measure of directed graphs that origins in fixed
point theory. This measure has shown its use in designing efficient algorithms
to verify logical properties of transition systems. We are interested in the
problem of deciding whether a graph has entanglement at most k. As this measure
is defined by means of games, game theoretic ideas naturally lead to design
polynomial algorithms that, for fixed k, decide the problem. Known
characterizations of directed graphs of entanglement at most 1 lead, for k = 1,
to design even faster algorithms. In this paper we present an explicit
characterization of undirected graphs of entanglement at most 2. With such a
characterization at hand, we devise a linear time algorithm to decide whether
an undirected graph has this property.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 08:07:11 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Aug 2007 09:04:14 GMT"
}
] | 2009-04-09T00:00:00 | [
[
"Belkhir",
"Walid",
"",
"LIF"
],
[
"Santocanale",
"Luigi",
"",
"LIF"
]
] |
0705.0420 | Saharian | A. S. Kotanjyan, A. A. Saharian | Electromagnetic field and radiation for a charge moving along a helical
trajectory inside a waveguide with dielectric filling | 17 pages, 9 figures, discussion, graphs, and references added | J.Phys.A40:10641-10656,2007 | 10.1088/1751-8113/40/34/018 | null | physics.class-ph hep-th | null | We investigate the electromagnetic field generated by a point charge moving
along a helical trajectory inside a circular waveguide with conducting walls
filled by homogeneous dielectric. The parts corresponding to the radiation
field are separated and the formulae for the radiation intensity are derived
for both TE and TM waves. It is shown that the main part of the radiated quanta
is emitted in the form of the TE waves. Various limiting cases are considered.
The results of the numerical calculations show that the insertion of the
waveguide provides an additional mechanism for tuning the characteristics of
the emitted radiation by choosing the parameters of the waveguide and filling
medium.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 08:41:25 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Aug 2007 20:52:44 GMT"
}
] | 2010-02-15T00:00:00 | [
[
"Kotanjyan",
"A. S.",
""
],
[
"Saharian",
"A. A.",
""
]
] |
0705.0421 | Daniele Galli | Frank H. Shu, Daniele Galli, Susana Lizano, Alfred E.Glassgold,
Patrick H. Diamond | Mean-Field Magnetohydrodynamics of Accretion Disks | The Astrophysical Journal, in press | Astrophys.J.665:535-553,2007 | 10.1086/519678 | null | astro-ph | null | We consider the accretion process in a disk with magnetic fields that are
dragged in from the interstellar medium by gravitational collapse. Two
diffusive processes are at work in the system: (1) "viscous" torques exerted by
turbulent and magnetic stresses, and (2) "resistive" redistribution of mass
with respect to the magnetic flux arising from the imperfect conduction of
current. In steady state, self-consistency between the two rates of drift
requires that a relationship exists between the coefficients of turbulent
viscosity and turbulent resistivity. Ignoring any interactions with a stellar
magnetosphere, we solve the steady-state equations for a magnetized disk under
the gravitational attraction of a mass point and threaded by an amount of
magnetic flux consistent with calculations of magnetized gravitational collapse
in star formation. Our model mean-field equations have an exact analytical
solution that corresponds to magnetically diluted Keplerian rotation about the
central mass point. The solution yields the strength of the magnetic field and
the surface density as functions of radial position in the disk and their
connection with the departure from pure Keplerian rotation in representative
cases. We compare the predictions of the theory with the available observations
concerning T Tauri stars, FU Orionis stars, and low- and high-mass protostars.
Finally, we speculate on the physical causes for high and low states of the
accretion disks that surround young stellar objects. One of the more important
results of this study is the physical derivation of analytic expressions for
the turbulent viscosity and turbulent resistivity.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 08:42:59 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Shu",
"Frank H.",
""
],
[
"Galli",
"Daniele",
""
],
[
"Lizano",
"Susana",
""
],
[
"Glassgold",
"Alfred E.",
""
],
[
"Diamond",
"Patrick H.",
""
]
] |
0705.0422 | Rapport De Recherche Inria | Omid Amini (INRIA Sophia Antipolis), Louis Esperet (LaBRI), Jan Van
Den Heuvel (LSE) | Frugal Colouring of Graphs | null | null | null | null | cs.DM cs.NI | null | A $k$-frugal colouring of a graph $G$ is a proper colouring of the vertices
of $G$ such that no colour appears more than $k$ times in the neighbourhood of
a vertex. This type of colouring was introduced by Hind, Molloy and Reed in
1997. In this paper, we study the frugal chromatic number of planar graphs,
planar graphs with large girth, and outerplanar graphs, and relate this
parameter with several well-studied colourings, such as colouring of the
square, cyclic colouring, and $L(p,q)$-labelling. We also study frugal
edge-colourings of multigraphs.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 08:52:00 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Amini",
"Omid",
"",
"INRIA Sophia Antipolis"
],
[
"Esperet",
"Louis",
"",
"LaBRI"
],
[
"Heuvel",
"Jan Van Den",
"",
"LSE"
]
] |
0705.0423 | Farbod Kayhan | A. Braunstein, F. Kayhan, G. Montorsi and R. Zecchina | Encoding for the Blackwell Channel with Reinforced Belief Propagation | 5 pages, 8 figures, submitted to ISIT 2007 | IEEE International Symposium on Information Theory (ISIT07); 2007.
p. 1891-5 | 10.1109/ISIT.2007.4557497 | null | cs.IT math.IT | null | A key idea in coding for the broadcast channel (BC) is binning, in which the
transmitter encode information by selecting a codeword from an appropriate bin
(the messages are thus the bin indexes). This selection is normally done by
solving an appropriate (possibly difficult) combinatorial problem. Recently it
has been shown that binning for the Blackwell channel --a particular BC-- can
be done by iterative schemes based on Survey Propagation (SP). This method uses
decimation for SP and suffers a complexity of O(n^2). In this paper we propose
a new variation of the Belief Propagation (BP) algorithm, named Reinforced BP
algorithm, that turns BP into a solver. Our simulations show that this new
algorithm has complexity O(n log n). Using this new algorithm together with a
non-linear coding scheme, we can efficiently achieve rates close to the border
of the capacity region of the Blackwell channel.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 09:49:15 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Braunstein",
"A.",
""
],
[
"Kayhan",
"F.",
""
],
[
"Montorsi",
"G.",
""
],
[
"Zecchina",
"R.",
""
]
] |
0705.0424 | James Robinson | Eric J. Olson, James C. Robinson | Almost bi-Lipschitz embeddings and almost homogeneous sets | Submitted to Transactions of the AMS | Trans AMS 362 (2010) 145-168 | null | null | math.MG | null | This paper is concerned with embeddings of homogeneous spaces into Euclidean
spaces. We show that any homogeneous metric space can be embedded into a
Hilbert space using an almost bi-Lipschitz mapping (bi-Lipschitz to within
logarithmic corrections). The image of this set is no longer homogeneous, but
`almost homogeneous'. We therefore study the problem of embedding an almost
homogeneous subset $X$ of a Hilbert space $H$ into a finite-dimensional
Euclidean space. In fact we show that if $X$ is a compact subset of a Banach
space and $X-X$ is almost homogeneous then, for $N$ sufficiently large, a
prevalent set of linear maps from $X$ into $\Re^N$ are almost bi-Lipschitz
between $X$ and its image. We are then able to use the Kuratowski embedding of
$(X,d)$ into $L^\infty(X)$ to prove a similar result for compact metric spaces.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 09:56:43 GMT"
}
] | 2011-02-19T00:00:00 | [
[
"Olson",
"Eric J.",
""
],
[
"Robinson",
"James C.",
""
]
] |
0705.0425 | Natalia Osipova | Natalia Osipova (INRIA Sophia Antipolis) | Batch Processor Sharing with Hyper-Exponential Service Time | Sophia Antipolis, France, 03 May 2007 | null | null | null | cs.NI | null | We study Batch Processor-Sharing (BPS) queuing model with hyper-exponential
service time distribution and Poisson batch arrival process. One of the main
goals to study BPS is the possibility of its application in size-based
scheduling, which is used in differentiation between Short and Long flows in
the Internet. In the case of hyper-exponential service time distribution we
find an analytical expression of the expected conditional response time for the
BPS queue. We show, that the expected conditional response time is a concave
function of the service time. We apply the received results to the Two Level
Processor-Sharing (TLPS) model with hyper-exponential service time distribution
and find the expression of the expected response time for the TLPS model. TLPS
scheduling discipline can be applied to size-based differentiation in TCP/IP
networks and Web server request handling.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:09:06 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 12:51:53 GMT"
},
{
"version": "v3",
"created": "Fri, 22 Jun 2007 09:53:50 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Osipova",
"Natalia",
"",
"INRIA Sophia Antipolis"
]
] |
0705.0426 | Pavel Tumarkin | Anna Felikson, Pavel Tumarkin | Reflection subgroups of Coxeter groups | v3: the proofs of Theorem 1 and Lemma 5 are corrected, an example
added. 13 pages | Trans. Amer. Math. Soc. 362 (2010), 847--858 | 10.1090/s0002-9947-09-04859-4 | null | math.GR | null | We use geometry of Davis complex of a Coxeter group to prove the following
result: if G is an infinite indecomposable Coxeter group and $H\subset G$ is a
finite index reflection subgroup then the rank of H is not less than the rank
of G. This generalizes results of math/0305093. We also describe some
properties of the nerves of the group and the subgroup in the case of equal
ranks.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:58:37 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 13:23:32 GMT"
},
{
"version": "v3",
"created": "Fri, 22 Feb 2008 04:04:16 GMT"
}
] | 2019-10-25T00:00:00 | [
[
"Felikson",
"Anna",
""
],
[
"Tumarkin",
"Pavel",
""
]
] |
0705.0427 | Takeo Kojima | B. Feigin, T. Kojima, J. Shiraishi, H. Watanabe | The Integrals of Motion for the Deformed Virasoro Algebra | Dedicated to Professor Masaki Kashiwara on the occasion on the 60th
birthday | null | null | null | math-ph math.GM math.MP | null | We explicitly construct two classes of infinitly many commutative operators
in terms of the deformed Virasoro algebra. We call one of them local integrals
and the other nonlocal one, since they can be regarded as elliptic deformations
of the local and nonlocal integrals of motion obtained by V.Bazhanov,
S.Lukyanov and Al.Zamolodchikov.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 09:59:23 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Sep 2007 14:32:21 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Feigin",
"B.",
""
],
[
"Kojima",
"T.",
""
],
[
"Shiraishi",
"J.",
""
],
[
"Watanabe",
"H.",
""
]
] |
0705.0428 | Emeric Gueguen | Emeric Gu\'eguen (IETR), Matthieu Crussi\`ere (IETR),
Jean-Fran\c{c}ois H\'elard (IETR) | An OFDM-CDMA scheme for high data rate UWB applications | null | VTC2007-Spring (04/2007) 2905-2909 | null | null | physics.comp-ph | null | In this paper, we investigate a new waveform for UWB systems obtained by the
combination of Orthogonal Frequency Division Multiplex (OFDM) and Code Division
Multiple Access (CDMA). The proposed system, called Spread Spectrum -
Multi-Carrier - Multiple Access (SS-MC-MA) turns out to be a judicious solution
to combat frequency selectivity and narrowband interferers, and to manage the
coexistence of several users and piconets. It is shown that the addition of a
degree of freedom brought by the spreading component of SS-MC-MA allows to
optimize jointly the assignment of the number of used codes and coding rates in
order to make the system more robust. Through simulations, it is demonstrated
that the new system can outperform Multi-Band OFDM Alliance (MBOA) for low data
rates and is able to provide wider range of rates.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 09:59:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Guéguen",
"Emeric",
"",
"IETR"
],
[
"Crussière",
"Matthieu",
"",
"IETR"
],
[
"Hélard",
"Jean-François",
"",
"IETR"
]
] |
0705.0429 | Francisco Kitaura | F.S. Kitaura and T.A. Ensslin | Bayesian reconstruction of the cosmological large-scale structure:
methodology, inverse algorithms and numerical optimization | 40 pages, 11 figures | 2008MNRAS.389..497K | 10.1111/j.1365-2966.2008.13341.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the inverse problem of cosmic large-scale structure reconstruction
from a Bayesian perspective. For a linear data model, a number of known and
novel reconstruction schemes, which differ in terms of the underlying signal
prior, data likelihood, and numerical inverse extra-regularization schemes are
derived and classified. The Bayesian methodology presented in this paper tries
to unify and extend the following methods: Wiener-filtering, Tikhonov
regularization, Ridge regression, Maximum Entropy, and inverse regularization
techniques. The inverse techniques considered here are the asymptotic
regularization, the Jacobi, Steepest Descent, Newton-Raphson,
Landweber-Fridman, and both linear and non-linear Krylov methods based on
Fletcher-Reeves, Polak-Ribiere, and Hestenes-Stiefel Conjugate Gradients. The
structures of the up-to-date highest-performing algorithms are presented, based
on an operator scheme, which permits one to exploit the power of fast Fourier
transforms. Using such an implementation of the generalized Wiener-filter in
the novel ARGO-software package, the different numerical schemes are
benchmarked with 1-, 2-, and 3-dimensional problems including structured white
and Poissonian noise, data windowing and blurring effects. A novel numerical
Krylov scheme is shown to be superior in terms of performance and fidelity.
These fast inverse methods ultimately will enable the application of sampling
techniques to explore complex joint posterior distributions. We outline how the
space of the dark-matter density field, the peculiar velocity field, and the
power spectrum can jointly be investigated by a Gibbs-sampling process. Such a
method can be applied for the redshift distortions correction of the observed
galaxies and for time-reversal reconstructions of the initial density field.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:54:49 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 20:41:10 GMT"
},
{
"version": "v3",
"created": "Fri, 6 Nov 2009 15:03:01 GMT"
}
] | 2009-11-06T00:00:00 | [
[
"Kitaura",
"F. S.",
""
],
[
"Ensslin",
"T. A.",
""
]
] |
0705.0430 | Emeric Gueguen | Emeric Gu\'eguen (IETR), Nadia Madaoui (IETR), Jean-Fran\c{c}ois
H\'elard (IETR), Matthieu Crussi\`ere (IETR) | Combination of OFDM and CDMA for high data rate UWB | null | Comptes rendus de l'acad\'emie des sciences, Physique 7 (09/2006)
774-784 | 10.1016/j.crhy.2006.07.001 | null | physics.comp-ph | null | For Wireless Personal Area Network (WPAN) systems, resource allocation
between several users within a piconet and the coexistence of several piconets
are very important points to take into consideration for the optimization of
high data rate Ultra Wide Band (UWB) systems. To improve the performance of the
Multi-Band OFDM (Orthogonal Frequency Division Multiplex) solution proposed by
the Multi-Band OFDM Alliance (MBOA), the addition of a spreading component in
the frequency domain is a good solution since it makes resource allocation
easier and also offers better robustness against channel frequency selectivity
and narrowband interference. The Spread Spectrum - Multi-Carrier - Multiple
Access (SS-MC-MA) system proposed in this article offers not only the
advantages of Multi-Carrier - Coded Division Multiple Access (MC-CDMA) brought
by frequency spreading, but also a more effective dynamic resource allocation
in a multi-user and multi-piconet context. These improvements are obtained
without increasing the complexity of the radio-frequency part compared to the
classical MBOA solution.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:05:39 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Guéguen",
"Emeric",
"",
"IETR"
],
[
"Madaoui",
"Nadia",
"",
"IETR"
],
[
"Hélard",
"Jean-François",
"",
"IETR"
],
[
"Crussière",
"Matthieu",
"",
"IETR"
]
] |
0705.0431 | Ayres Freitas | C. Balazs, M. Carena, A. Freitas, C.E.M. Wagner | Phenomenology of the nMSSM from colliders to cosmology | 44 pp, 10 figures; Fig.9 replaced; discussion on CP violation
extended and references added; few minor additions in text about details of
the cuts | JHEP 0706:066,2007 | 10.1088/1126-6708/2007/06/066 | ANL-HEP-PR-07-22; EFI-07-09; FERMILAB-PUB-07-080-T; ZU-TH 11/07 | hep-ph | null | Low energy supersymmetric models provide a solution to the hierarchy problem
and also have the necessary ingredients to solve two of the most outstanding
issues in cosmology: the origin of dark matter and baryonic matter. One of the
most attractive features of this framework is that the relevant physical
processes are related to interactions at the weak scale and therefore may be
tested in collider experiments in the near future. This is true for the Minimal
Supersymmetric Standard Model (MSSM) as well as for its extension with the
addition of one singlet chiral superfield, the so-called nMSSM. It has been
recently shown that within the nMSSM an elegant solution to both the problem of
baryogenesis and dark matter may be found, that relies mostly on the mixing of
the singlet sector with the Higgs sector of the theory. In this work we review
the nMSSM model constraints from cosmology and present the associated collider
phenomenology at the LHC and the ILC. We show that the ILC will efficiently
probe the neutralino, chargino and Higgs sectors, allowing to confront
cosmological observations with computations based on collider measurements. We
also investigate the prospects for a direct detection of dark matter and the
constraints imposed by the current bounds of the electron electric dipole
moment in this model.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:28:17 GMT"
},
{
"version": "v2",
"created": "Mon, 28 May 2007 10:39:34 GMT"
},
{
"version": "v3",
"created": "Thu, 14 Feb 2008 15:20:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Balazs",
"C.",
""
],
[
"Carena",
"M.",
""
],
[
"Freitas",
"A.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] |
0705.0432 | Alexei Yu. Karlovich | Alexei Yu. Karlovich | Higher order asymptotic formulas for Toeplitz matrices with symbols in
generalized H\"older spaces | 20 pages | null | null | null | math.FA math.CA | null | We prove higher order asymptotic formulas for determinants and traces of
finite block Toeplitz matrices generated by matrix functions belonging to
generalized H\"older spaces with characteristic functions from the
Bari-Stechkin class. We follow the approach of B\"ottcher and Silbermann and
generalize their results for symbols in standard H\"older spaces.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:31:14 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Karlovich",
"Alexei Yu.",
""
]
] |
0705.0433 | Manuel Perucho Pla | M. Perucho and A.P. Lobanov | Physical properties of the jet in 0836+710 revealed by its transversal
structure | Accepted for publication in Astronomy & Astrophysics Letters | null | 10.1051/0004-6361:20077610 | null | astro-ph | null | Studying the internal structure of extragalactic jets is crucial for
understanding their physics. The Japanese-led space VLBI project VSOP has
presented an opportunity for such studies, by reaching baseline lengths of up
to 36,000 km and resolving structures down to an angular size of $\approx 0.3$
mas at 5 GHz. VSOP observations of the jet in 0836+710 at 1.6 and 5 GHz have
enabled tracing of the radial structure of the flow on scales from 2 mas to 200
mas along the jet and determination of the wavelengths of individual
oscillatory modes responsible for the formation of the structure observed. We
apply linear stability analysis to identify the oscillatory modes with modes of
Kelvin-Helmholtz instability that match the wavelengths of the structures
observed. We find that the jet structure in 0836+710 can be reproduced by the
helical surface mode and a combination of the helical and elliptic body modes
of Kelvin-Helmholtz instability. Our results indicate that the jet is
substantially stratified and different modes of the instability grow inside the
jet at different distances to the jet axis. The helical surface mode can be
driven externally, and we discuss the implications of the driving frequency on
the physics of the active nucleus in 0836+710.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:36:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Perucho",
"M.",
""
],
[
"Lobanov",
"A. P.",
""
]
] |
0705.0434 | Petra E. J\"onsson | P. E. J\"onsson, R. Mathieu, W. Wernsdorfer, A. M. Tkachuk, and B.
Barbara | Absence of Conventional Spin-Glass Transition in the Ising Dipolar
System LiHo_xY_{1-x}F_4 | 5 pages, 4 figures | Phys. Rev. Lett. 98, 256403 (2007) | 10.1103/PhysRevLett.98.256403 | null | cond-mat.dis-nn | null | The magnetic properties of single crystals of LiHo_xY_{1-x}F_4 with x=16.5%
and x=4.5% were recorded down to 35 mK using a micro-SQUID magnetometer. While
this system is considered as the archetypal quantum spin glass, the detailed
analysis of our magnetization data indicates the absence of a phase transition,
not only in a transverse applied magnetic field, but also without field. A
zero-Kelvin phase transition is also unlikely, as the magnetization seems to
follow a non-critical exponential dependence on the temperature. Our analysis
thus unmasks the true, short-ranged nature of the magnetic properties of the
LiHo_xY_{1-x}F_4 system, validating recent theoretical investigations
suggesting the lack of phase transition in this system.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:38:33 GMT"
},
{
"version": "v2",
"created": "Sat, 23 Jun 2007 06:30:02 GMT"
}
] | 2007-06-23T00:00:00 | [
[
"Jönsson",
"P. E.",
""
],
[
"Mathieu",
"R.",
""
],
[
"Wernsdorfer",
"W.",
""
],
[
"Tkachuk",
"A. M.",
""
],
[
"Barbara",
"B.",
""
]
] |
0705.0435 | Andrey Vassilev | Iordan Iordanov, Andrey Vassilev | Optimal relocation strategies for spatially mobile consumers | 27 pages | null | null | null | math.OC | null | We develop a model of the behaviour of a dynamically optimizing economic
agent who makes consumption-saving and spatial relocation decisions. We
formulate an existence result for the model, derive the necessary conditions
for optimality and study the behaviour of the economic agent, focusing on the
case of a wage distribution with a single maximum.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:47:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Iordanov",
"Iordan",
""
],
[
"Vassilev",
"Andrey",
""
]
] |
0705.0436 | Tao Zhou | Tao Zhou | Mixing navigation on networks | 4 pages, and 7 figures | Physica A 387 (2008) 3025-3032 | 10.1016/j.physa.2008.01.056 | null | physics.soc-ph physics.data-an | null | In this Letter, we proposed a mixing navigation mechanism, which interpolates
between random-walk and shortest-path protocol. The navigation efficiency can
be remarkably enhanced via a few routers. Some advanced strategies are also
designed: For non-geographical scale-free networks, the targeted strategy with
a tiny fraction of routers can guarantee an efficient navigation with low and
stable delivery time almost independent of network size. For geographical
localized networks, the clustering strategy can simultaneously increase the
efficiency and reduce the communication cost. The present mixing navigation
mechanism is of significance especially for information organization of
wireless sensor networks and distributed autonomous robotic systems.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 10:56:57 GMT"
},
{
"version": "v2",
"created": "Sat, 26 May 2007 21:22:44 GMT"
}
] | 2008-04-03T00:00:00 | [
[
"Zhou",
"Tao",
""
]
] |
0705.0437 | Jerome Bertrand | Jerome Bertrand | Existence and uniqueness of optimal maps on Alexandrov spaces | null | null | null | null | math.DG math.AP | null | The purpose of this paper is to show that in a finite dimensional metric
space with Alexandrov's curvature bounded below, Monge's transport problem for
the quadratic cost admits a unique solution.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 11:22:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bertrand",
"Jerome",
""
]
] |
0705.0438 | Hendrik Hildebrandt | H. Hildebrandt, T. Erben, M. Schirmer, J. P. Dietrich and P. Schneider | The Garching-Bonn Deep Survey (GaBoDS) Wide-Field-Imaging Reduction
Pipeline | 6 pages, 3 figures, proceedings of ESO Calibration Workshop 2007 | null | 10.1007/978-3-540-76963-7_75 | null | astro-ph | null | We introduce our publicly available Wide-Field-Imaging reduction pipeline
THELI. The procedures applied for the efficient pre-reduction and astrometric
calibration are presented. A special emphasis is put on the methods applied to
the photometric calibration. As a test case the reduction of optical data from
the ESO Deep Public Survey including the WFI-GOODS data is described. The
end-products of this project are now available via the ESO archive Advanced
Data Products section.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 11:35:47 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Hildebrandt",
"H.",
""
],
[
"Erben",
"T.",
""
],
[
"Schirmer",
"M.",
""
],
[
"Dietrich",
"J. P.",
""
],
[
"Schneider",
"P.",
""
]
] |
0705.0439 | Marco Genovese | G. Brida, M. Genovese, F.Piacentini | Experimental local realism tests without fair sampling assumption | null | EPJD, Vol. 4, Issue 3 (2007) | 10.1140/epjd/e2007-00194-5 | null | quant-ph | null | Following the theoretical suggestion of Ref. [1,2], we present experimental
results addressed to test restricted families of local realistic models, but
without relying on the fair sampling assumption.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:17:51 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 08:39:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brida",
"G.",
""
],
[
"Genovese",
"M.",
""
],
[
"Piacentini",
"F.",
""
]
] |
0705.0440 | Yvonne Wong | Jan Hamann, Steen Hannestad, Georg G. Raffelt, Yvonne Y. Y. Wong | Observational bounds on the cosmic radiation density | 23 pages, 3 figures, uses iopart.cls; v2: 1 new figure, references
added, matches published version | JCAP0708:021,2007 | 10.1088/1475-7516/2007/08/021 | MPP-2007-50, TUM-HEP-668/07 | astro-ph hep-ph | null | We consider the inference of the cosmic radiation density, traditionally
parameterised as the effective number of neutrino species N_eff, from precision
cosmological data. Paying particular attention to systematic effects, notably
scale-dependent biasing in the galaxy power spectrum, we find no evidence for a
significant deviation of N_eff from the standard value of N_eff^0=3.046 in any
combination of cosmological data sets, in contrast to some recent conclusions
of other authors. The combination of all available data in the linear regime
prefers, in the context of a ``vanilla+N_eff'' cosmological model,
1.1<N_eff<4.8 (95% C.L.) with a best-fit value of 2.6. Adding data at smaller
scales, notably the Lyman-alpha forest, we find 2.2<N_eff<5.8 (95% C.L.) with
3.8 as the best fit. Inclusion of the Lyman-alpha data shifts the preferred
N_eff upwards because the sigma_8 value derived from the SDSS Lyman-alpha data
is inconsistent with that inferred from CMB. In an extended cosmological model
that includes a nonzero mass for N_eff neutrino flavours, a running scalar
spectral index and a w parameter for the dark energy, we find 0.8<N_eff<6.1
(95% C.L.) with 3.0 as the best fit.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:00:24 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Aug 2007 11:01:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hamann",
"Jan",
""
],
[
"Hannestad",
"Steen",
""
],
[
"Raffelt",
"Georg G.",
""
],
[
"Wong",
"Yvonne Y. Y.",
""
]
] |
0705.0441 | Manuel Perucho Pla | Manuel Perucho, Michal Hanasz, Jose-Maria Marti, Juan-Antonio Miralles | Resonant Kelvin-Helmholtz modes in sheared relativistic flows | Accepted for publication in Physical Review E. For better quality
images, please check
http://www.mpifr-bonn.mpg.de/staff/mperucho/Research.html | Phys.Rev.E75:056312,2007 | 10.1103/PhysRevE.75.056312 | null | astro-ph | null | Qualitatively new aspects of the (linear and non-linear) stability of sheared
relativistic (slab) jets are analyzed. The linear problem has been solved for a
wide range of jet models well inside the ultrarelativistic domain (flow Lorentz
factors up to 20; specific internal energies $\approx 60c^2$). As a distinct
feature of our work, we have combined the analytical linear approach with
high-resolution relativistic hydrodynamical simulations, which has allowed us
i) to identify, in the linear regime, resonant modes specific to the
relativistic shear layer ii) to confirm the result of the linear analysis with
numerical simulations and, iii) more interestingly, to follow the instability
development through the non-linear regime. We find that very high-order
reflection modes with dominant growth rates can modify the global, long-term
stability of the relativistic flow. We discuss the dependence of these resonant
modes on the jet flow Lorentz factor and specific internal energy, and on the
shear layer thickness. The results could have potential applications in the
field of extragalactic relativistic jets.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 11:57:49 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Perucho",
"Manuel",
""
],
[
"Hanasz",
"Michal",
""
],
[
"Marti",
"Jose-Maria",
""
],
[
"Miralles",
"Juan-Antonio",
""
]
] |
0705.0442 | Bakmaev Sabir | S. Bakmaev, Yu. M. Bystritskiy, E. A. Kuraev, E. Tomasi-Gustafsson | Bremsstrahlung photon polarization for $ee^\pm\to (e\gamma)e^\pm$, and
$ep\to (e\gamma)p$ high energy collisions | 9 pages, 3 figures | JETP Lett.87:227-232,2008 | 10.1134/S0021364008050019 | null | hep-ph | null | The polarization of bremsstrahlung photon in the processes $ee^\pm\to
(e\gamma)e^\pm$, and $ep\to (e\gamma)p$ is calculated for peripheral
kinematics, in the high energy limit where the cross section does not decrease
with the incident energy. When the initial electron is
unpolarized(longitudinally polarized) the final photon can be linearly
(circularly) polarized. The Stokes parameters of the photon polarization are
calculated as a function of the kinematical variables of process: the energy of
recoil particle, the energy fraction of scattered electron, and the polar and
azimuthal angles of photon. Numerical results are given in form of tables, for
typical values of the relevant kinematic variables.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 11:58:30 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Bakmaev",
"S.",
""
],
[
"Bystritskiy",
"Yu. M.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] |
0705.0443 | Haruhiko Terao | Haruhiko Terao | Higgs and Top quark coupled with a conformal gauge sector | 12 pages, 3 Postscript figures, uses RevTex.sty; corrected typos and
references | null | 10.1142/9789812790750_0041 | KANAZAWA-07-03 | hep-ph | null | We propose a dynamical scenario beyond the standard model, in which the
radiative correction to the Higgs mass parameter is suppressed due to a large
anomalous dimension induced through a conformal invariant coupling with an
extra gauge sector. Then the anomalous dimension also suppresses the Yukawa
couplings of the Higgs field. However, the large top Yukawa coupling can be
generated effectively through mixing among top quarks and the fermions of the
conformal gauge sector. This scenario is found to predict a fairly heavy Higgs
mass of about 500 GeV. We present an explicit model and show consistency with
the Electro-Weak precision measurements of the S and T parameters as well as
the Z boson decay width.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:02:40 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 02:33:59 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Terao",
"Haruhiko",
""
]
] |
0705.0444 | Nir Raz | Aharon Casher and Nir Raz | On Black Hole Remnants | 27 pages, no figures | null | null | TAUP 2856/07 | hep-th gr-qc | null | We introduce two models for a planck scale black hole remnant (Planckon),
which can hold arbitrarily large information, while keeping a vanishing
coupling and discuss their physical properties.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:17:39 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Casher",
"Aharon",
""
],
[
"Raz",
"Nir",
""
]
] |
0705.0445 | Xavier Calmet | Xavier Calmet | Very Light Cosmological Scalar Fields from a Tiny Cosmological Constant | 11 pages | Phys.Rev.D76:083502,2007 | 10.1103/PhysRevD.76.083502 | null | astro-ph hep-ph hep-th | null | We discuss a mechanism which generates a mass term for a scalar field in an
expanding universe. The mass of this field turns out to be generated by the
cosmological constant and can be naturally small if protected by a conformal
symmetry which is however broken in the gravitational sector. The mass is
comparable today to the Hubble time. This scalar field could thus impact our
universe today and for example be at the origin of a time variation of the
couplings and masses of the parameters of the standard model.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:18:21 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 09:45:08 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Calmet",
"Xavier",
""
]
] |
0705.0446 | Gul'nara Karataeva | Yu. L. Bukhmastova | Quasars Lensed by Globular Clusters of Spiral and Elliptical Galaxies | 11 pages, 9 figures, 4 tables | Astron.Lett.33:355-367,2007; Pisma Astron.Zh.33:403-416,2007 | 10.1134/S1063773707060011 | null | astro-ph | null | Based on the SDSS catalog, we have found new close quasar-galaxy pairs.
Quasars projected onto the halos of nearer galaxies are encountered among the
multitude of quasars observed at various distances from us. Among them there
are quasars that are close to the galaxies not only in angular separation, but
also in redshift. Such quasar-galaxy pairs are called close pairs. We developed
further the hypothesis that such pairs appear, because the fluxer on the
nucleus of the more distant galaxy passes through halo globular clusters of the
nearer galaxy,resulting in magnification and splitting of the image of the
source that we interpret as a quasar. To corroborate this hypothesis, we
analyzed the distribution of quasars in the plane of the halos of these
galaxies. The quasars from close pairs were found to follow the density profile
of globular clusters in the halos of elliptical and spiral galaxies with slopes
of -1.5 and -2.4 for elliptical and spiral galaxies, respectively. This
suggests that quasars do not appear near galaxies by chance and that quasars
are associated with galaxies via halo globular clusters.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:26:29 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bukhmastova",
"Yu. L.",
""
]
] |
0705.0447 | Boris Gaensicke | B.T. Gaensicke, T.R. Marsh, J. Southworth | SDSSJ104341.53+085558.2: A second white dwarf with a gaseous debris disc | Accepted by MNRAS letters, minor changes with respect to the
submitted version | null | 10.1111/j.1745-3933.2007.00343.x | null | astro-ph | null | Intermediate resolution spectroscopy of the white dwarf
SDSSJ104341.53+085558.2 contains double-peaked emission lines of
CaII8498,8542,8662 and identifies this object to be the second single white
dwarf to be surrounded by a gaseous disc of metal-rich material, similar to the
recently discovered SDSSJ1228+1040. A photospheric Magnesium abundance of 0.3
times the solar value, determined from the observed MgII4481 absorption line,
implies that the white dwarf is accreting from the circumstellar material. The
absence of Balmer emission lines and of photospheric HeI4471 absorption
indicates that the accreted material is depleted in volatile elements and, by
analogy with SDSS1228+1040, may be the result of the tidal disruption of an
asteroid. Additional spectroscopy of the DAZ white dwarfs WD1337+705 and GD362
does not reveal CaII emission lines. GD362 is one of the few cool DAZ that
display strong infrared flux excess, thought to be originating in a
circumstellar dust disc, and its temperature is likely too low to sublimate
sufficient amounts of disc material to generate detectable CaII emission.
WD1337+705 is, as SDSS1228+1040 and SDSS1043+0855, moderately hot, but has the
lowest Mg abundance of those three stars, suggesting a possible correlation
between the photospheric Mg abundance and the equivalent width of the CaII
emission triplet. Our inspection of 7360 white dwarfs from SDSS DR4 fails to
unveil additional strong "metal gas disc" candidates, and implies that these
objects are rather rare.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:28:03 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 20:32:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gaensicke",
"B. T.",
""
],
[
"Marsh",
"T. R.",
""
],
[
"Southworth",
"J.",
""
]
] |
0705.0448 | Marcus Gellert | M. Gellert, G. R\"udiger, D. Elstner | Helicity generation and alpha-effect by Vandakurov-Tayler instability
with z-dependent differential rotation | accepted for publication in A&A | Astron.Astrophys.479:L33-L36,2008 | 10.1051/0004-6361:20077781 | null | astro-ph | null | We investigate in isothermal MHD simulations the instability of toroidal
magnetic fields resulting by the action of z-dependent differential rotation on
a given axial field B^0 in a cylindrical enclosure where in particular the
helicity of the resulting nonaxisymmetric flow is of interest. The idea is
probed that helicity H is related to the external field and the differential
rotation as H ~ B^0_i B^0_j Omega_i,j. The observed instability leads to a
nonaxisymmetric solution with dominating mode m=1. With the onset of
instability both kinematic and current helicity are produced which fulfill the
suggested relation. Obviously, differential rotation dOmega/dz only needs an
external axial field B^0_z to produce remarkable amounts of the helicities. Any
regular time-dependency of the helicity could not be found. The resulting axial
alpha-effect is mainly due to the current helicity, the characteristic time
scale between both the values is of order of the rotation time. If the axial
field is switched off then the helicity and the alpha-effect disappear.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:31:22 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 13:07:14 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Gellert",
"M.",
""
],
[
"Rüdiger",
"G.",
""
],
[
"Elstner",
"D.",
""
]
] |
0705.0449 | Pierre-Francois Marteau | Pierre-Fran\c{c}ois Marteau (VALORIA), Gilbas M\'enier (VALORIA) | Multiresolution Approximation of Polygonal Curves in Linear Complexity | null | null | null | null | cs.CV | null | We propose a new algorithm to the problem of polygonal curve approximation
based on a multiresolution approach. This algorithm is suboptimal but still
maintains some optimality between successive levels of resolution using dynamic
programming. We show theoretically and experimentally that this algorithm has a
linear complexity in time and space. We experimentally compare the outcomes of
our algorithm to the optimal "full search" dynamic programming solution and
finally to classical merge and split approaches. The experimental evaluations
confirm the theoretical derivations and show that the proposed approach
evaluated on 2D coastal maps either show a lower time complexity or provide
polygonal approximations closer to the input discrete curves.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:47:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Marteau",
"Pierre-François",
"",
"VALORIA"
],
[
"Ménier",
"Gilbas",
"",
"VALORIA"
]
] |
0705.0450 | Jerome Darmont | J\'er\^ome Darmont (LIMOS), Michel Schneider (LIMOS) | VOODB: A Generic Discrete-Event Random Simulation Model to Evaluate the
Performances of OODBs | null | 25th International Conference on Very Large Databases (VLDB 99)
(09/1999) 254-265 | null | null | cs.DB | null | Performance of object-oriented database systems (OODBs) is still an issue to
both designers and users nowadays. The aim of this paper is to propose a
generic discrete-event random simulation model, called VOODB, in order to
evaluate the performances of OODBs in general, and the performances of
optimization methods like clustering in particular. Such optimization methods
undoubtedly improve the performances of OODBs. Yet, they also always induce
some kind of overhead for the system. Therefore, it is important to evaluate
their exact impact on the overall performances. VOODB has been designed as a
generic discrete-event random simulation model by putting to use a modelling
approach, and has been validated by simulating the behavior of the O2 OODB and
the Texas persistent object store. Since our final objective is to compare
object clustering algorithms, some experiments have also been conducted on the
DSTC clustering technique, which is implemented in Texas. To validate VOODB,
performance results obtained by simulation for a given experiment have been
compared to the results obtained by benchmarking the real systems in the same
conditions. Benchmarking and simulation performance evaluations have been
observed to be consistent, so it appears that simulation can be a reliable
approach to evaluate the performances of OODBs.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:50:04 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Darmont",
"Jérôme",
"",
"LIMOS"
],
[
"Schneider",
"Michel",
"",
"LIMOS"
]
] |
0705.0451 | Ilya Shkredov | I.D. Shkredov | On a two-dimensional analog of Szemeredi's Theorem in Abelian groups | 40 pages | null | null | null | math.NT math.CO | null | Let G be a finite Abelian group and A be a subset G\times G of cardinality at
least |G|^2/(log log |G|)^c, where c>0 is an absolute constant. We prove that A
contains a triple {(k,m), (k+d,m), (k,m+d)}, where d does not equal 0. This
theorem is a two-dimensional generalization of Szemeredi's theorem on
arithmetic progressions.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:50:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Shkredov",
"I. D.",
""
]
] |
0705.0452 | Konrad Waldorf | Urs Schreiber and Konrad Waldorf | Parallel Transport and Functors | 73 pages, 1 figure. Version 2 contains several improvements, in
particular concerning the proofs of Lem. 2.15 and of Prop. 4.7, and the
discussion in Appendix A2. Some notation has also been changed. Version 3
comes with an extended discussion of groupoid bundles with connection.
Version 4 is the published version. In Version 5 we have replaced parts of
the proof of Prop. 4.7 by better arguments | J. Homotopy Relat. Struct. 4, 187-244 (2009) | null | null | math.DG math.CT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Parallel transport of a connection in a smooth fibre bundle yields a functor
from the path groupoid of the base manifold into a category that describes the
fibres of the bundle. We characterize functors obtained like this by two
notions we introduce: local trivializations and smooth descent data. This
provides a way to substitute categories of functors for categories of smooth
fibre bundles with connection. We indicate that this concept can be generalized
to connections in categorified bundles, and how this generalization improves
the understanding of higher dimensional parallel transport.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:14:35 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Jan 2008 17:52:13 GMT"
},
{
"version": "v3",
"created": "Sun, 14 Jun 2009 09:15:58 GMT"
},
{
"version": "v4",
"created": "Wed, 12 Aug 2009 19:53:39 GMT"
},
{
"version": "v5",
"created": "Mon, 25 Aug 2014 10:50:43 GMT"
}
] | 2014-08-26T00:00:00 | [
[
"Schreiber",
"Urs",
""
],
[
"Waldorf",
"Konrad",
""
]
] |
0705.0453 | Jerome Darmont | J\'er\^ome Darmont (LIMOS), Bertrand Petit (LIMOS), Michel Schneider
(LIMOS) | OCB: A Generic Benchmark to Evaluate the Performances of Object-Oriented
Database Systems | null | LNCS, Vol. 1377 (03/1998) 326-340 | null | null | cs.DB | null | We present in this paper a generic object-oriented benchmark (the Object
Clustering Benchmark) that has been designed to evaluate the performances of
clustering policies in object-oriented databases. OCB is generic because its
sample database may be customized to fit the databases introduced by the main
existing benchmarks (e.g., OO1). OCB's current form is clustering-oriented
because of its clustering-oriented workload, but it can be easily adapted to
other purposes. Lastly, OCB's code is compact and easily portable. OCB has been
implemented in a real system (Texas, running on a Sun workstation), in order to
test a specific clustering policy called DSTC. A few results concerning this
test are presented.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 12:54:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Darmont",
"Jérôme",
"",
"LIMOS"
],
[
"Petit",
"Bertrand",
"",
"LIMOS"
],
[
"Schneider",
"Michel",
"",
"LIMOS"
]
] |
0705.0454 | Jerome Darmont | J\'er\^ome Darmont (LIMOS), Amar Attoui (LIMOS), Michel Gourgand
(LIMOS) | Performance Evaluation for Clustering Algorithms in Object-Oriented
Database Systems | null | LNCS, Vol. 978 (09/1995) 187-196 | null | null | cs.DB | null | It is widely acknowledged that good object clustering is critical to the
performance of object-oriented databases. However, object clustering always
involves some kind of overhead for the system. The aim of this paper is to
propose a modelling methodology in order to evaluate the performances of
different clustering policies. This methodology has been used to compare the
performances of three clustering algorithms found in the literature (Cactis, CK
and ORION) that we considered representative of the current research in the
field of object clustering. The actual performance evaluation was performed
using simulation. Simulation experiments we performed showed that the Cactis
algorithm is better than the ORION algorithm and that the CK algorithm totally
outperforms both other algorithms in terms of response time and clustering
overhead.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:02:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Darmont",
"Jérôme",
"",
"LIMOS"
],
[
"Attoui",
"Amar",
"",
"LIMOS"
],
[
"Gourgand",
"Michel",
"",
"LIMOS"
]
] |
0705.0455 | Felix Ritort | F. Ritort | Nonequilibrium fluctuations in small systems: From physics to biology | Invited contribution to "Advances in Chemical Physics" to appear in
Vol. 137, Ed. Wiley & Sons, 81 pages + 19 PS figures | null | null | null | cond-mat.stat-mech cond-mat.dis-nn | null | In this paper I am presenting an overview on several topics related to
nonequilibrium fluctuations in small systems. I start with a general discussion
about fluctuation theorems and applications to physical examples extracted from
physics and biology: a bead in an optical trap and single molecule force
experiments. Next I present a general discussion on path thermodynamics and
consider distributions of work/heat fluctuations as large deviation functions.
Then I address the topic of glassy dynamics from the perspective of
nonequilibrium fluctuations due to small cooperatively rearranging regions.
Finally, I conclude with a brief digression on future perspectives.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 06:36:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ritort",
"F.",
""
]
] |
0705.0456 | Emilio Porcu | Christian Berg, Jorge Mateu, Emilio Porcu | The Dagum family of isotropic correlation functions | Published in at http://dx.doi.org/10.3150/08-BEJ139 the Bernoulli
(http://isi.cbs.nl/bernoulli/) by the International Statistical
Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm) | Bernoulli 2008, Vol. 14, No. 4, 1134-1149 | 10.3150/08-BEJ139 | IMS-BEJ-BEJ139 | math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A function $\rho:[0,\infty)\to(0,1]$ is a completely monotonic function if
and only if $\rho(\Vert\mathbf{x}\Vert^2)$ is positive definite on
$\mathbb{R}^d$ for all $d$ and thus it represents the correlation function of a
weakly stationary and isotropic Gaussian random field. Radial positive definite
functions are also of importance as they represent characteristic functions of
spherically symmetric probability distributions. In this paper, we analyze the
function \[\rho(\beta ,\gamma)(x)=1-\biggl(\frac{x^{\beta}}{1+x^{\beta}}\biggr
)^{\gamma},\qquad x\ge 0, \beta,\gamma>0,\] called the Dagum function, and show
those ranges for which this function is completely monotonic, that is, positive
definite, on any $d$-dimensional Euclidean space. Important relations arise
with other families of completely monotonic and logarithmically completely
monotonic functions.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:08:21 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Nov 2008 08:48:44 GMT"
}
] | 2008-11-17T00:00:00 | [
[
"Berg",
"Christian",
""
],
[
"Mateu",
"Jorge",
""
],
[
"Porcu",
"Emilio",
""
]
] |
0705.0457 | Luis Dieulefait | Luis Dieulefait | The level 1 case of Serre's conjecture revisited | very minor changes | null | null | null | math.NT | null | We prove existence of conjugate Galois representations, and we use it to
derive a simple method of weight reduction. As a consequence, an alternative
proof of the level 1 case of Serre's conjecture follows.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:11:12 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 15:55:34 GMT"
},
{
"version": "v3",
"created": "Tue, 26 Feb 2008 21:23:43 GMT"
}
] | 2008-02-26T00:00:00 | [
[
"Dieulefait",
"Luis",
""
]
] |
0705.0458 | Irene I. Bouw | Irene I. Bouw | The accessory parameter problem in positive characteristic | null | null | null | null | math.AG math.NT | null | We study the existence of Fuchsian differential equations in positive
characteristic with nilpotent p-curvature, and given local invariants. In the
case of differential equations with logarithmic local mononodromy, we determine
the minimal possible degree of a polynomial solution.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:12:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bouw",
"Irene I.",
""
]
] |
0705.0459 | Dr. Anirudh Pradhan | J. P. Singh, A. Pradhan and A. K. Singh | Bianchi Type-I Cosmological Models with Variable G and 4\Lambda$-Terms
in General Relativity | 12 pages, no figure | Astrophys.SpaceSci.314:83-88,2008 | 10.1007/s10509-008-9742-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein's field equations with variable gravitational and cosmological
``constant'' are considered in presence of perfect fluid for Bianchi type-I
spacetime. Consequences of the four cases of the phenomenological decay of
$\Lambda$ have been discussed which are consistent with observations. The
physical significance of the cosmological models have also been discussed.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:29:08 GMT"
},
{
"version": "v2",
"created": "Sat, 26 Jul 2008 16:04:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Singh",
"J. P.",
""
],
[
"Pradhan",
"A.",
""
],
[
"Singh",
"A. K.",
""
]
] |
0705.0460 | Ponniah Ravindran | P. Ravindran, R. Vidya, A. Kjekshus, H. Fjellv{\aa}g, and O. Eriksson | Origin of magnetoelectric behavior in BiFeO$_3$ | 19 pages, 12 figures, 4 tables | Physical Review B 74, 224412 (2006) | 10.1103/PhysRevB.74.224412 | null | cond-mat.mtrl-sci cond-mat.other | null | The magnetoelectric behavior of BiFeO$_3$ has been explored on the basis of
accurate density functional calculations. The structural, electronic, magnetic,
and ferroelectric properties of BiFeO$_3$ are predicted correctly without
including strong correlation effect in the calculation. Moreover, the
experimentally-observed elongation of cubic perovskite-like lattice along the
[111] direction is correctly reproduced. At high pressure we predicted a
pressure-induced structural transition and the total energy calculations at
expanded lattice show two lower energy ferroelectric phases, closer in energy
to the ground state phase. Band-structure calculations show that BiFeO$_3$ will
be an insulator in A- and G-type antiferromagnetic phases and a metal in other
magnetic configurations. Chemical bonding in BiFeO$_3$ has been analyzed using
various tools and electron localization function analysis shows that
stereochemically active lone-pair electrons at the Bi sites are responsible for
displacements of the Bi atoms from the centro-symmetric to the
noncentrosymmetric structure and hence the ferroelectricity. A large
ferroelectric polarization (88.7 $\mu$C/cm$^{2}$) is predicted in accordance
with recent experimental findings. The net polarization is found to mainly ($>$
98%) originate from Bi atoms. Moreover the large scatter in experimentally
reported polarization values is due to the large anisotropy in the spontaneous
polarization.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:32:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ravindran",
"P.",
""
],
[
"Vidya",
"R.",
""
],
[
"Kjekshus",
"A.",
""
],
[
"Fjellvåg",
"H.",
""
],
[
"Eriksson",
"O.",
""
]
] |
0705.0461 | Valentina D'Odorico | Valentina D'Odorico | A cold metal-poor cloud traced by a weak MgII absorption at z~0.45.
First detection of SiI, CaI and FeI in a QSO absorber | 7 pages, 9 figures. A&A in press | Astronomy & Astrophysics, 2007, v. 470, pp. 523-529 | 10.1051/0004-6361:20077159 | null | astro-ph | null | We present the observations of a weak MgII absorption system detected at
z~0.452 in the UVES high resolution spectrum of the QSO HE0001-2340. The weaker
of the two MgII components forming the system shows associated absorptions due
to SiI, CaI and FeI observed for the first time in a QSO spectrum. We
investigate the nature of this absorber by comparing its properties with those
of different classes of absorbers (weak MgII, Damped Ly-alpha systems and local
interstellar clouds) and reproducing its ionization conditions with
photoionization models. The observed absorber belongs to the class of weak MgII
systems on the basis of its equivalent width, however the relative strength of
commonly observed transitions deviates significantly from those of the above
mentioned absorbers. A rough estimate of the probability to cross such a system
with a QSO line of sight is P~0.03. The presence of rare neutral transitions
suggests that the cloud is shielded by a large amount of neutral hydrogen. A
detailed comparison of the observed column densities with the average
properties of damped Ly-alpha systems and local interstellar cold clouds shows,
in particular, deficient MgII/MgI and CaII/CaI ratios in our cloud. The results
of photoionization models indicate that the cloud could be ionized by the UV
background. However, a simple model of a single cloud with uniform density
cannot reproduce the observed ionic abundance ratios, suggesting a more complex
density structure for the absorber. Supposing that ionization corrections are
negligible, the most puzzling result is the underabundance of magnesium with
respect to iron which is hard to explain both with nucleosynthesis and with
differential dust depletion. [Abridged]
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:17:43 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 08:49:46 GMT"
}
] | 2008-05-16T00:00:00 | [
[
"D'Odorico",
"Valentina",
""
]
] |
0705.0462 | Nicolas Tabareau | Paul-Andr\'e Melli\`es (PPS), Nicolas Tabareau (PPS) | Resource modalities in game semantics | null | null | null | null | math.CT cs.CL | null | The description of resources in game semantics has never achieved the
simplicity and precision of linear logic, because of a misleading conception:
the belief that linear logic is more primitive than game semantics. We advocate
instead the contrary: that game semantics is conceptually more primitive than
linear logic. Starting from this revised point of view, we design a categorical
model of resources in game semantics, and construct an arena game model where
the usual notion of bracketing is extended to multi- bracketing in order to
capture various resource policies: linear, affine and exponential.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:44:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Melliès",
"Paul-André",
"",
"PPS"
],
[
"Tabareau",
"Nicolas",
"",
"PPS"
]
] |
0705.0463 | Giancarlo Ferrera | Giancarlo Ferrera, (Barcelona U., ECM and Granada U.) | Threshold Resummation in Semi-Inclusive B decays | 5 pages, 9 figures. Talk given at the 4th International Workshop on
the CKM Unitarity Triangle (CKM 2006), Nagoya, Japan, 12-16 Dec 2006 | null | null | null | hep-ph | null | We discuss threshold resummation in radiative and charmless semileptonic B
decays. To deal with the large non perturbative effects, we introduce a model
for NNLL resummed form factors based on the analytic QCD coupling. By means of
this model we can reproduce with good accuracy the experimental data. Finally
we briefly present an improved threshold resummed formula to deal with jets
initiated by massive quarks as in the case of semileptonic charmed decays.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 17:11:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ferrera",
"Giancarlo",
""
]
] |
0705.0464 | Tiziana Di Salvo Dr. | T. Di Salvo, L. Burderi, A. Riggio, A. Papitto, M. T. Menna | Order in the chaos? The strange case of accreting millisecond pulsars | 10 Pages, 3 Figures. Final version to be published on AIP Conference
Proceedings | AIP Conf.Proc.924:613-622,2007; AIP Conf.Proc.1054:173-182,2008 | 10.1063/1.2775909 10.1063/1.3002500 | null | astro-ph | null | We review recent results from the X-ray timing of accreting millisecond
pulsars in Low Mass X-ray Binaries. This is the first time a timing analysis is
performed on accreting millisecond pulsars, and for the first time we can
obtain information on the behavior of a very fast pulsar subject to accretion
torques. We find both spin-up and spin-down behaviors, from which, using
available models for the accretion torques, we derive information on the mass
accretion rate and magnetic field of the neutron star in these systems. We also
find that the phase delays behavior as a function of time in these sources is
sometimes quite complex and difficult to interpret, since phase shifts, most
probably driven by variations of the X-ray flux, are sometimes present.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:53:40 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 10:10:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Di Salvo",
"T.",
""
],
[
"Burderi",
"L.",
""
],
[
"Riggio",
"A.",
""
],
[
"Papitto",
"A.",
""
],
[
"Menna",
"M. T.",
""
]
] |
0705.0465 | Shuang-Wei Hu | Shuang-Wei Hu, Bin-Bin Liu | Birefringence and non-transversality of light propagation in an
ultra-strongly magnetized vacuum | 6 pages, 3 figures; v2: Several typos corrected, text improved | J.Phys.A40:13859-13868,2007 | 10.1088/1751-8113/40/46/003 | null | hep-th | null | The birefringence phenomenon in the vacuum with a constant magnetic
background of arbitrary strength is considered within the framework of the
effective action approach. A new feature of the birefringence in a magnetized
vacuum is that the parallel mode, which is polarized parallel to the plane
containing the magnetic field and the photon wave vector, is no longer
transverse. We have studied this feature in detail for arbitrary magnetic field
and provided analytic results for the ultra-strong magnetic field regime.
Possible physical implications of our results in astrophysics are discussed.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:55:47 GMT"
},
{
"version": "v2",
"created": "Sun, 13 May 2007 01:35:58 GMT"
},
{
"version": "v3",
"created": "Mon, 5 Nov 2007 02:24:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hu",
"Shuang-Wei",
""
],
[
"Liu",
"Bin-Bin",
""
]
] |
0705.0466 | Gilles Pages | Olivier Aj Bardou (GDF-RDD), Sandrine Bouthemy (GDF-RDD), Gilles
Pag\`es (PMA) | When are Swing options bang-bang and how to use it | 28 pages | International Journal of Theoretical and Applied Finance 13, 6
(2010) 867-899 | 10.1142/S0219024910006030 | null | math.PR | null | In this paper we investigate a class of swing options with firm constraints
in view of the modeling of supply agreements. We show, for a fully general
payoff process, that the premium, solution to a stochastic control problem, is
concave and piecewise affine as a function of the global constraints of the
contract. The existence of bang-bang optimal controls is established for a set
of constraints which generates by affinity the whole premium function. When the
payoff process is driven by an underlying Markov process, we propose a
quantization based recursive backward procedure to price these contracts. A
priori error bounds are established, uniformly with respect to the global
constraints.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:56:52 GMT"
}
] | 2013-04-03T00:00:00 | [
[
"Bardou",
"Olivier Aj",
"",
"GDF-RDD"
],
[
"Bouthemy",
"Sandrine",
"",
"GDF-RDD"
],
[
"Pagès",
"Gilles",
"",
"PMA"
]
] |
0705.0467 | Chen Avin | Noga Alon, Chen Avin, Michal Koucky, Gady Kozma, Zvi Lotker and Mark
R. Tuttle | Many Random Walks Are Faster Than One | 15 pages | null | null | null | math.PR | null | We pose a new and intriguing question motivated by distributed computing
regarding random walks on graphs: How long does it take for several independent
random walks, starting from the same vertex, to cover an entire graph? We study
the cover time - the expected time required to visit every node in a graph at
least once - and we show that for a large collection of interesting graphs,
running many random walks in parallel yields a speed-up in the cover time that
is linear in the number of parallel walks. We demonstrate that an exponential
speed-up is sometimes possible, but that some natural graphs allow only a
logarithmic speed-up. A problem related to ours (in which the walks start from
some probabilistic distribution on vertices) was previously studied in the
context of space efficient algorithms for undirected s-t connectivity and our
results yield, in certain cases, an improvement upon some of the earlier
bounds.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:56:53 GMT"
},
{
"version": "v2",
"created": "Tue, 20 Nov 2007 13:30:06 GMT"
}
] | 2007-11-20T00:00:00 | [
[
"Alon",
"Noga",
""
],
[
"Avin",
"Chen",
""
],
[
"Koucky",
"Michal",
""
],
[
"Kozma",
"Gady",
""
],
[
"Lotker",
"Zvi",
""
],
[
"Tuttle",
"Mark R.",
""
]
] |
0705.0468 | F. Alberto Grunbaum | F. Alberto Gr\"unbaum | The Rahman Polynomials Are Bispectral | This is a contribution to the Vadim Kuznetsov Memorial Issue on
Integrable Systems and Related Topics, published in SIGMA (Symmetry,
Integrability and Geometry: Methods and Applications) at
http://www.emis.de/journals/SIGMA/ | SIGMA 3 (2007), 065, 11 pages | 10.3842/SIGMA.2007.065 | null | math.CA math-ph math.MP | null | In a very recent paper, M. Rahman introduced a remarkable family of
polynomials in two variables as the eigenfunctions of the transition matrix for
a nontrivial Markov chain due to M. Hoare and M. Rahman. I indicate here that
these polynomials are bispectral. This should be just one of the many
remarkable properties enjoyed by these polynomials. For several challenges,
including finding a general proof of some of the facts displayed here the
reader should look at the last section of this paper.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 13:59:26 GMT"
}
] | 2008-04-24T00:00:00 | [
[
"Grünbaum",
"F. Alberto",
""
]
] |
0705.0469 | Jouni Suhonen | Markus Kortelainen and Jouni Suhonen | Improved short-range correlations and 0nbb nuclear matrix elements of
76Ge and 82Se | 5 pages, 2 figures, to appear in Physical Review C (Rapid
Communication) 2007 | Phys.Rev.C75:051303,2007 | 10.1103/PhysRevC.75.051303 | null | nucl-th | null | We calculate the nuclear matrix elements of the neutrinoless double beta
($0\nu\beta\beta$) decays of $^{76}$Ge and $^{82}$Se for the light-neutrino
exchange mechanism. The nuclear wave functions are obtained by using realistic
two-body forces within the proton-neutron quasiparticle random-phase
approximation (pnQRPA). We include the effects that come from the finite size
of a nucleon, from the higher-order terms of nucleonic weak currents, and from
the nucleon-nucleon short-range correlations. Most importantly, we improve on
the presently available calculations by replacing the rudimentary Jastrow
short-range correlations by the more advanced unitary correlation operator
method (UCOM). The UCOM corrected matrix elements turn out to be notably larger
in magnitude than the Jastrow corrected ones. This has drastic consequences for
the detectability of $0\nu\beta\beta$ decay in the present and future double
beta experiments.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:00:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kortelainen",
"Markus",
""
],
[
"Suhonen",
"Jouni",
""
]
] |
0705.0470 | Dmitri Melikhov | Wolfgang Lucha, Dmitri Melikhov, and Silvano Simula | Systematic uncertainties of hadron parameters obtained with QCD sum
rules | Revtex 9 pages, typoes corrected, version to be published in Phys.
Rev. D | Phys.Rev.D76:036002,2007 | 10.1103/PhysRevD.76.036002 | null | hep-ph | null | We study the uncertainties of the determination of the ground-state
parameters from Shifman-Vainshtein-Zakharov (SVZ) sum rules, making use of the
harmonic-oscillator potential model as an example. In this case, one knows the
exact solution for the polarization operator $\Pi(\mu)$, which allows one to
obtain both the OPE to any order and the spectrum of states. We start with the
OPE for $\Pi(\mu)$ and analyze the extraction of the square of the ground-state
wave function, $R\propto|\Psi_0(\vec r=0)|^2$, from an SVZ sum rule, setting
the mass of the ground state $E_0$ equal to its known value and treating the
effective continuum threshold as a fit parameter. We show that in a limited
``fiducial'' range of the Borel parameter there exists a solution for the
effective threshold which precisely reproduces the exact $\Pi(\mu)$ for any
value of $R$ within the range $0.7 \le R/R_0 \le 1.15$ ($R_0$ is the known
exact value). Thus, the value of $R$ extracted from the sum rule is determined
to a great extent by the contribution of the hadron continuum. Our main finding
is that in the cases where the hadron continuum is not known and is modeled by
an effective continuum threshold, the systematic uncertainties of the sum-rule
procedure cannot be controlled.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:17:57 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jul 2007 08:42:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lucha",
"Wolfgang",
""
],
[
"Melikhov",
"Dmitri",
""
],
[
"Simula",
"Silvano",
""
]
] |
0705.0471 | Antonio Crapsi | Antonio Crapsi (1,2), Paola Caselli (1,3), Malcolm C. Walmsley (1),
and Mario Tafalla (4) ((1) Arcetri, (2) Leiden, (3) CfA, (4) OAN) | Observing the gas temperature drop in the high-density nucleus of L 1544 | 12 pages, 6 figures. Accepted for publication by A&A | null | 10.1051/0004-6361:20077613 | null | astro-ph | null | Abridged: The thermal structure of a starless core is crucial for our
understanding of the physics in these objects and hence for our understanding
of star formation. Theory predicts a gas temperature drop in the inner 5000 AU
of these objects, but there has been little observational proof of this. We
performed VLA observations of the NH3 (1,1) and (2,2) transitions towards the
pre-stellar core L 1544 in order to measure the temperature gradient between
the high density core nucleus and the surrounding core envelope. Our VLA
observation for the first time provide measurements of gas temperature in a
core with a resolution smaller than 1000 AU. We have also obtained high
resolution Plateau de Bure observations of the 110 GHz 111-101 para-NH2D line
in order to further constrain the physical parameters of the high density
nucleus. We have estimated the temperature gradient using a model of the source
to fit our data in the u,v plane. We find that indeed the temperature decreases
toward the core nucleus from 12 K down to 5.5 K resulting in an increase of a
factor of 50% in the estimated density of the core from the dust continuum if
compared with the estimates done with constant temperature of 8.75 K. We also
found a remarkably high abundance of deuterated ammonia with respect to the
ammonia abundance (50%+-20%), which proves the persistence of nitrogen bearing
molecules at very high densities (2e6 cm-3) and shows that high-resolution
observations yield higher deuteration values than single-dish observations. Our
analysis of the NH3 and NH2D kinematic fields shows a decrease of specific
angular momentum from the large scales to the small scales.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:18:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Crapsi",
"Antonio",
"",
"Arcetri",
"Leiden"
],
[
"Caselli",
"Paola",
"",
"Arcetri",
"CfA"
],
[
"Walmsley",
"Malcolm C.",
"",
"Arcetri"
],
[
"Tafalla",
"Mario",
"",
"OAN"
]
] |
0705.0472 | Patrick Le Meur | Patrick Le Meur (CMLA) | Simple connectedness of quasitilted algebras | This note is a complement to the preprint arXiv:math/0702457 of the
author and in which the same characterisation of simple connectedness is
proved for piecewise hereditary algebras of type a quiver | null | null | null | math.RT | null | Let A be a basic connected finite dimensional algebra over an algebraically
closed field. Assuming that A is quasitilted, we prove that A is simply
connected if and only if its first Hochschild cohomology group HH^1(A)
vanishes. This generalises a result of I. Assem, F.U. Coelho and S. Trepode and
which proves the same equivalence for tame quasitilted algebras.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:23:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Meur",
"Patrick Le",
"",
"CMLA"
]
] |
0705.0473 | Cecile Barbachoux | C\'ecile Barbachoux (LERMA), J\'erome Gariel (LERMA), G\'erard Le
Denmat (LERMA) | Cosmological energy in a thermo-horizon and the first law | null | Phys.Lett.B658:181-184,2008 | 10.1016/j.physletb.2007.07.051 | null | hep-th astro-ph gr-qc | null | We consider a cosmological horizon, named thermo-horizon, to which are
associated a temperature and an entropy of Bekenstein-Hawking and which obeys
the first law for an energy flow calculated through the corresponding limit
surface. We point out a contradiction between the first law and the definition
of the total energy contained inside the horizon. This contradiction is removed
when the first law is replaced by a Gibbs' equation for a vacuum-like component
associated to the event horizon.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:24:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Barbachoux",
"Cécile",
"",
"LERMA"
],
[
"Gariel",
"Jérome",
"",
"LERMA"
],
[
"Denmat",
"Gérard Le",
"",
"LERMA"
]
] |
0705.0474 | Kaiyou Wang | K. Y. Wang, A. W. Rushforth, V. A. Grant, R. P. Campion, K. W.
Edmonds, C. R. Staddon, C. T. Foxon, B. L. Gallagher, J. Wunderlich, D. A.
Williams | Domain imaging and domain wall propagation in (Ga,Mn)As thin films with
tensile strain | 8 pages, 3 figures. to appear in Journal of Applied Physics | null | 10.1063/1.2732406 | null | cond-mat.mtrl-sci | null | We have performed spatially resolved Polar Magneto-Optical Kerr Effect
Microscopy measurements on as-grown and annealed Ga0.95Mn0.05As thin films with
tensile strain. We find that the films exhibit very strong perpendicular
magnetic anisotropy which is increased upon annealing. During magnetic
reversal, the domain walls propagate along the direction of surface ripples for
the as-grown sample at low temperatures and along the [110] direction for the
annealed sample. This indicates that the magnetic domain pattern during
reversal is determined by a combination of magnetocrystalline anisotropy and a
distribution of pinning sites along the surface ripples that can be altered by
annealing. These mechanisms could lead to an effective method of controlling
domain wall propagation.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:35:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"K. Y.",
""
],
[
"Rushforth",
"A. W.",
""
],
[
"Grant",
"V. A.",
""
],
[
"Campion",
"R. P.",
""
],
[
"Edmonds",
"K. W.",
""
],
[
"Staddon",
"C. R.",
""
],
[
"Foxon",
"C. T.",
""
],
[
"Gallagher",
"B. L.",
""
],
[
"Wunderlich",
"J.",
""
],
[
"Williams",
"D. A.",
""
]
] |
0705.0475 | Sergey Astakhov | Ernestine A. Lee, Sergey A. Astakhov, David Farrelly | Production of trans-Neptunian binaries through chaos-assisted capture | submitted to MNRAS | Mon.Not.Roy.Astron.Soc.379:229-246,2007 | 10.1111/j.1365-2966.2007.11930.x | null | astro-ph math.DS nlin.CD | null | The recent discovery of binary objects in the Kuiper-belt opens an invaluable
window into past and present conditions in the trans-Neptunian part of the
Solar System. For example, knowledge of how these objects formed can be used to
impose constraints on planetary formation theories. We have recently proposed a
binary-object formation model based on the notion of chaos-assisted capture.
Here we present a more detailed analysis with calculations performed in the
spatial (three-dimensional) three- and four-body Hill approximations. It is
assumed that the potential binary partners are initially following heliocentric
Keplerian orbits and that their relative motion becomes perturbed as these
objects undergo close encounters. First, the mass, velocity, and orbital
element distribu- tions which favour binary formation are identified in the
circular and elliptical Hill limits. We then consider intruder scattering in
the circular Hill four-body problem and find that the chaos-assisted capture
mechanism is consistent with observed, apparently randomly distributed, binary
mutual orbit inclinations. It also predicts asymmetric distributions of
retrograde versus prograde orbits. The time-delay induced by chaos on particle
transport through the Hill sphere is analogous to the formation of a resonance
in a chemical reaction. Implications for binary formation rates are considered
and the 'fine-tuning' problem recently identified by Noll et al. (2007) is also
addressed.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:36:36 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Lee",
"Ernestine A.",
""
],
[
"Astakhov",
"Sergey A.",
""
],
[
"Farrelly",
"David",
""
]
] |
0705.0476 | De-Qi Zhang | De-Qi Zhang | Automorphism groups and anti-pluricanonical curves | Mathematical Research Letters (to appear); 20 pages | Math. Res. Lett. 15 (2008), no. 1, 163 - 183 | null | null | math.AG math.DS | null | We show the existence of an anti-pluricanonical curve on every smooth
projective rational surface X which has an infinite group G of automorphisms of
either null entropy or of type Z . Z (semi-direct product), provided that the
pair (X, G) is minimal. This was conjectured by Curtis T. McMullen (2005) and
further traced back to Marat Gizatullin and Brian Harbourne (1987). We also
prove (perhaps) the strongest form of the famous Tits alternative theorem.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:40:02 GMT"
}
] | 2018-09-24T00:00:00 | [
[
"Zhang",
"De-Qi",
""
]
] |
0705.0477 | Javier Virto | Sebastien Descotes-Genon (Orsay, LPT), Joaquim Matias (Barcelona,
IFAE), Javier Virto (Barcelona, IFAE) | Penguin-mediated B_(d,s)->VV decays and the Bs - anti-Bs mixing angle | 16 pages, 4 figures. References added. Version published in PRD | Phys.Rev.D76:074005,2007; Erratum-ibid.D84:039901,2011 | 10.1103/PhysRevD.76.074005 10.1103/PhysRevD.84.039901 | UAB-FT-631, LPT-ORSAY/07-28 | hep-ph | null | In this letter, we propose three different strategies to extract the weak
mixing angle phi_s of the Bs system using penguin-mediated decays into vectors,
mainly Bs->K*K*, Bs->phi K* and Bs->phi phi. We also provide predictions for
the longitudinal branching ratio and CP-asymmetries of Bs->K*K* using a method
that combines QCD factorisation with flavour symmetries to relate this decay to
its Bd counterpart.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:42:15 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 17:46:16 GMT"
},
{
"version": "v3",
"created": "Mon, 1 Oct 2007 17:31:56 GMT"
}
] | 2011-08-12T00:00:00 | [
[
"Descotes-Genon",
"Sebastien",
"",
"Orsay, LPT"
],
[
"Matias",
"Joaquim",
"",
"Barcelona,\n IFAE"
],
[
"Virto",
"Javier",
"",
"Barcelona, IFAE"
]
] |
0705.0478 | Burra Sidharth Gautam | Burra G.Sidharth | The Dark Matter Puzzle And Other Issues | 20 pages, Latex | null | null | null | physics.gen-ph | null | We consider the problem of the flattening of the velocity curves in galactic
discs and the consequent postulation of dark matter from three different but
converging perspectives-- a change in the large scale dimensionality of space,
a variation of $G$ and the MOND approach. We also discuss the paradigm of the
universe itself being a Black Hole.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:43:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sidharth",
"Burra G.",
""
]
] |
0705.0479 | Simon Verley | S. Verley, S. C. Odewahn, L. Verdes-Montenegro, S. Leon, F. Combes, J.
Sulentic, G. Bergond, D. Espada, E. Garcia, U. Lisenfeld, and J. Sabater | The AMIGA sample of isolated galaxies. IV. A catalogue of neighbours
around isolated galaxies | Accepted by A&A, 10 pages, 8 figures, 4 tables | null | 10.1051/0004-6361:20077307 | null | astro-ph | null | Studies of the effects of environment on galaxy properties and evolution
require well defined control samples. Such isolated galaxy samples have up to
now been small or poorly defined. The AMIGA project (Analysis of the
interstellar Medium of Isolated GAlaxies) represents an attempt to define a
statistically useful sample of the most isolated galaxies in the local (z <
0.05) Universe. A suitable large sample for the AMIGA project already exists,
the Catalogue of Isolated Galaxies (CIG, Karachentseva 1973; 1050 galaxies),
and we use this sample as a starting point to refine and perform a better
quantification of its isolation properties. Digitised POSS-I E images were
analysed out to a minimum projected radius R > 0.5 Mpc around 950 CIG galaxies
(those within Vr = 1500 km s-1 were excluded). We identified all galaxy
candidates in each field brighter than B = 17.5 with a high degree of
confidence using the LMORPHO software. We generated a catalogue of
approximately 54 000 potential neighbours (redshifts exist for 30% of this
sample). Six hundred sixty-six galaxies pass and two hundred eighty-four fail
the original CIG isolation criterion. The available redshift data confirm that
our catalogue involves a largely background population rather than physically
associated neighbours. We find that the exclusion of neighbours within a factor
of four in size around each CIG galaxy, employed in the original isolation
criterion, corresponds to Delta Vr ~ 18000 km s-1 indicating that it was a
conservative limit. Galaxies in the CIG have been found to show different
degrees of isolation. We conclude that a quantitative measure of this is
mandatory. It will be the subject of future work based on the catalogue of
neighbours obtained here.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:45:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Verley",
"S.",
""
],
[
"Odewahn",
"S. C.",
""
],
[
"Verdes-Montenegro",
"L.",
""
],
[
"Leon",
"S.",
""
],
[
"Combes",
"F.",
""
],
[
"Sulentic",
"J.",
""
],
[
"Bergond",
"G.",
""
],
[
"Espada",
"D.",
""
],
[
"Garcia",
"E.",
""
],
[
"Lisenfeld",
"U.",
""
],
[
"Sabater",
"J.",
""
]
] |
0705.0480 | Luca Moriconi | M. Kholmyansky, L. Moriconi, and A. Tsinober | Large Scale Intermittency in the Atmospheric Boundary Layer | null | null | 10.1103/PhysRevE.76.026307 | null | physics.flu-dyn cond-mat.stat-mech physics.ao-ph | null | We find actual evidence, relying upon vorticity time series taken in a high
Reynolds number atmospheric experiment, that to a very good approximation the
surface boundary layer flow may be described, in a statistical sense and under
certain regimes, as an advected ensemble of homogeneous turbulent systems,
characterized by a lognormal distribution of fluctuating intensities. Our
analysis suggests that usual direct numerical simulations of homogeneous and
isotropic turbulence, performed at moderate Reynolds numbers, may play an
important role in the study of turbulent boundary layer flows, if supplemented
with appropriate statistical information concerned with the structure of large
scale fluctuations.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 14:57:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kholmyansky",
"M.",
""
],
[
"Moriconi",
"L.",
""
],
[
"Tsinober",
"A.",
""
]
] |
0705.0481 | D. Shaun Bloomfield | D. S. Bloomfield, S. K. Solanki, A. Lagg, J. M. Borrero, and P. S.
Cally | Modified p-modes in penumbral filaments? | 8 pages, 12 figures, accepted for publication in Astronomy &
Astrophysics | Astronomy and Astrophysics (2007) 469, 1155-1161 | 10.1051/0004-6361:20077330 | null | astro-ph | null | Aims: The primary objective of this study is to search for and identify wave
modes within a sunspot penumbra.
Methods: Infrared spectropolarimetric time series data are inverted using a
model comprising two atmospheric components in each spatial pixel. Fourier
phase difference analysis is performed on the line-of-sight velocities
retrieved from both components to determine time delays between the velocity
signals. In addition, the vertical separation between the signals in the two
components is calculated from the Stokes velocity response functions.
Results: The inversion yields two atmospheric components, one permeated by a
nearly horizontal magnetic field, the other with a less-inclined magnetic
field. Time delays between the oscillations in the two components in the
frequency range 2.5-4.5 mHz are combined with speeds of atmospheric wave modes
to determine wave travel distances. These are compared to expected path lengths
obtained from response functions of the observed spectral lines in the
different atmospheric components. Fast-mode (i.e., modified p-mode) waves
exhibit the best agreement with the observations when propagating toward the
sunspot at an angle ~50 degrees to the vertical.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:23:44 GMT"
}
] | 2007-07-23T00:00:00 | [
[
"Bloomfield",
"D. S.",
""
],
[
"Solanki",
"S. K.",
""
],
[
"Lagg",
"A.",
""
],
[
"Borrero",
"J. M.",
""
],
[
"Cally",
"P. S.",
""
]
] |
0705.0482 | Borys Alvarez-Samaniego | Borys Alvarez-Samaniego and Xavier Carvajal | On The Local Well-Posedness for Some Systems of Coupled KdV Equations | 26 pages | Nonlinear Analysis-Series A: Theory, Methods & Applications 69
(2008), No. 2, 692-715 | 10.1016/j.na.2007.06.009 | null | math.AP math-ph math.MP | null | Using the theory developed by Kenig, Ponce, and Vega, we prove that the
Hirota-Satsuma system is locally well-posed in Sobolev spaces $H^s(\mathbb{R})
\times H^{s}(\mathbb{R})$ for $3/4<s\le1$. We introduce some Bourgain-type
spaces $X_{s,b}^a$ for $a\not =0$, $s,b \in \mathbb{R}$ to obtain local
well-posedness for the Gear-Grimshaw system in $H^s(\mathbb{R})\times
H^s(\mathbb{R})$ for $s>-3/4$, by establishing new mixed-bilinear estimates
involving the two Bourgain-type spaces $X_{s,b}^{-\alpha_-}$ and
$X_{s,b}^{-\alpha_+}$ adapted to $\partial_t+\alpha_-\partial_x^3$ and
$\partial_t+\alpha_+\partial_x^3$ respectively, where
$|\alpha_+|=|\alpha_-|\not = 0$.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:10:17 GMT"
}
] | 2018-03-29T00:00:00 | [
[
"Alvarez-Samaniego",
"Borys",
""
],
[
"Carvajal",
"Xavier",
""
]
] |
0705.0483 | Vikram Dwarkadas | Vikram V. Dwarkadas | SN Shock Evolution in the Circumstellar Medium surrounding SN 1987A | 5 pages, 3 Figures. To be published in the proceedings of the
conference on "Supernova 1987A: 20 Years After: Supernovae and Gamma-Ray
Bursters" AIP, New York, eds. S. Immler, K.W. Weiler, and R. McCray | AIP Conf.Proc.937:120-124,2007 | 10.1063/1.2803551 | null | astro-ph | null | We study the structure of the circumstellar medium surrounding SN 1987A in
the equatorial plane. Furthermore, we study the evolution of the SN shock
within this medium during the first 25 years, and the resulting hard X-ray and
radio emission from the remnant.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 19:54:38 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Dwarkadas",
"Vikram V.",
""
]
] |
0705.0484 | Ella Jamsin | Ella Jamsin | A Note on Conserved Charges of Asymptotically Flat and Anti-de Sitter
Spaces in Arbitrary Dimensions | 27 pages; v2 : references added, minor corrections; v3 : replaced to
match published version forthcoming in General Relativity and Gravitation | Gen.Rel.Grav.40:2569-2590,2008 | 10.1007/s10714-008-0640-6 | ULB-TH/07-18 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The calculation of conserved charges of black holes is a rich problem, for
which many methods are known. Until recently, there was some controversy on the
proper definition of conserved charges in asymptotically anti-de Sitter (AdS)
spaces in arbitrary dimensions. This paper provides a systematic and explicit
Hamiltonian derivation of the energy and the angular momenta of both
asymptotically flat and asymptotically AdS spacetimes in any dimension D bigger
or equal to 4. This requires as a first step a precise determination of the
asymptotic conditions of the metric and of its conjugate momentum. These
conditions happen to be achieved in ellipsoidal coordinates adapted to the
rotating solutions.The asymptotic symmetry algebra is found to be isomorphic
either to the Poincare algebra or to the so(D-1, 2) algebra, as expected. In
the asymptotically flat case, the boundary conditions involve a generalization
of the parity conditions, introduced by Regge and Teitelboim, which are
necessary to make the angular momenta finite. The charges are explicitly
computed for Kerr and Kerr-AdS black holes for arbitrary D and they are shown
to be in agreement with thermodynamical arguments.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:58:07 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 12:42:29 GMT"
},
{
"version": "v3",
"created": "Mon, 18 Aug 2008 16:38:11 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Jamsin",
"Ella",
""
]
] |
0705.0485 | Wellington G. Dantas | C.E. Fiore, W.G. Dantas and M.J. de Oliveira | A comparative study for the pair-creation contact process using series
expansions | null | J. Phys. A, 40, 4305 (2007) | 10.1088/1751-8113/40/16/004 | null | cond-mat.stat-mech | null | A comparative study between two distinct perturbative series expansions for
the pair-creation contact process is presented. In contrast to the ordinary
contact process, whose supercritical series expansions provide accurate
estimates for its critical behavior, the supercritical approach does not work
properly when applied to the pair-creation process. To circumvent this problem
a procedure is introduced in which one-site creation is added to the
pair-creation. An alternative method is the generation of subcritical series
expansions which works even for the case of the pure pair-creation process.
Differently from the supercritical case, the subcritical series yields
estimates that are compatible with numerical simulations.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:26:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fiore",
"C. E.",
""
],
[
"Dantas",
"W. G.",
""
],
[
"de Oliveira",
"M. J.",
""
]
] |
0705.0486 | Christopher Gorham Lester | Benjamin C. Allanach, Christopher G. Lester | Sampling using a `bank' of clues | v1: 18 pages, 7 figures. v2: 22 pages, 9 figures: no changes to the
algorithm, but more example distributions are provided against which the
sampler is tested | Comput.Phys.Commun.179:256-266,2008 | 10.1016/j.cpc.2008.02.020 | DAMTP-2007-18, Cavendish-HEP-2007-02 | hep-ph physics.data-an | null | An easy-to-implement form of the Metropolis Algorithm is described which,
unlike most standard techniques, is well suited to sampling from multi-modal
distributions on spaces with moderate numbers of dimensions (order ten) in
environments typical of investigations into current constraints on
Beyond-the-Standard-Model physics. The sampling technique makes use of
pre-existing information (which can safely be of low or uncertain quality)
relating to the distribution from which it is desired to sample. This
information should come in the form of a ``bank'' or ``cache'' of space points
of which at least some may be expected to be near regions of interest in the
desired distribution. In practical circumstances such ``banks of clues'' are
easy to assemble from earlier work, aborted runs, discarded burn-in samples
from failed sampling attempts, or from prior scouting investigations. The
technique equilibrates between disconnected parts of the distribution without
user input. The algorithm is not lead astray by ``bad'' clues, but there is no
free lunch: performance gains will only be seen where clues are helpful.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:50:08 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Nov 2007 21:59:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Allanach",
"Benjamin C.",
""
],
[
"Lester",
"Christopher G.",
""
]
] |
0705.0487 | Ben Allanach | Ben C Allanach, Kyle Cranmer, Christopher G Lester and Arne M Weber | Natural Priors, CMSSM Fits and LHC Weather Forecasts | 26 pages, 38 figures, revised version 3 has added results on the
frequentist interpretation: an additional section, and author | JHEP 0708:023,2007 | 10.1088/1126-6708/2007/08/023 | DAMTP-2007-18, Cavendish-HEP-2007-03, MPP-2007-36 | hep-ph hep-ex | null | Previous LHC forecasts for the constrained minimal supersymmetric standard
model (CMSSM), based on current astrophysical and laboratory measurements, have
used priors that are flat in the parameter tan beta, while being constrained to
postdict the central experimental value of MZ. We construct a different, new
and more natural prior with a measure in mu and B (the more fundamental MSSM
parameters from which tan beta and MZ are actually derived). We find that as a
consequence this choice leads to a well defined fine-tuning measure in the
parameter space. We investigate the effect of such on global CMSSM fits to
indirect constraints, providing posterior probability distributions for Large
Hadron Collider (LHC) sparticle production cross sections. The change in priors
has a significant effect, strongly suppressing the pseudoscalar Higgs boson
dark matter annihilation region, and diminishing the probable values of
sparticle masses. We also show how to interpret fit information from a Markov
Chain Monte Carlo in a frequentist fashion; namely by using the profile
likelihood. Bayesian and frequentist interpretations of CMSSM fits are compared
and contrasted.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:50:30 GMT"
},
{
"version": "v2",
"created": "Fri, 11 May 2007 16:34:37 GMT"
},
{
"version": "v3",
"created": "Thu, 5 Jul 2007 16:15:32 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Allanach",
"Ben C",
""
],
[
"Cranmer",
"Kyle",
""
],
[
"Lester",
"Christopher G",
""
],
[
"Weber",
"Arne M",
""
]
] |
0705.0488 | Christopher Hammond | Christopher Hammond, Jennifer Moorhouse, Marian E. Robbins | Adjoints of composition operators with rational symbol | 14 pages | null | 10.1016/j.jmaa.2007.10.039 | null | math.FA | null | Building on techniques developed by Cowen and Gallardo-Guti\'{e}rrez, we find
a concrete formula for the adjoint of a composition operator with rational
symbol acting on the Hardy space $H^{2}$. We consider some specific examples,
comparing our formula with several results that were previously known.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:40:36 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Hammond",
"Christopher",
""
],
[
"Moorhouse",
"Jennifer",
""
],
[
"Robbins",
"Marian E.",
""
]
] |
0705.0489 | Thomas Schucker | Jan-H. Jureit, Thomas Krajewski, Thomas Schucker, Christoph A. Stephan | On the noncommutative standard model | dedicated to Alain Connes on the occasion of his 60th birthday | Acta Phys.Polon.B38:3181-3202,2007 | null | null | hep-th | null | We propose a pedestrian review of the noncommutative standard model in its
present state.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:50:20 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Jureit",
"Jan-H.",
""
],
[
"Krajewski",
"Thomas",
""
],
[
"Schucker",
"Thomas",
""
],
[
"Stephan",
"Christoph A.",
""
]
] |
0705.0490 | Jens Glaser | K. Kroy and J. Glaser | The Glassy Wormlike Chain | 12 pages, 8 figures. Minor corrections | New J. Phys. 9:416 (2007) | 10.1088/1367-2630/9/11/416 | null | cond-mat.soft | null | We introduce a new model for the dynamics of a wormlike chain in an
environment that gives rise to a rough free energy landscape, which we baptise
the glassy wormlike chain. It is obtained from the common wormlike chain by an
exponential stretching of the relaxation spectrum of its long-wavelength
eigenmodes, controlled by a single stretching parameter. Predictions for
pertinent observables such as the dynamic structure factor and the
microrheological susceptibility exhibit the characteristics of soft glassy
rheology and compare favourably with experimental data for reconstituted
cytoskeletal networks and live cells. We speculate about the possible
microscopic origin of the stretching, implications for the nonlinear rheology,
and the potential physiological significance of our results.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:53:53 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 16:07:45 GMT"
},
{
"version": "v3",
"created": "Mon, 30 Jul 2007 17:00:06 GMT"
}
] | 2007-12-02T00:00:00 | [
[
"Kroy",
"K.",
""
],
[
"Glaser",
"J.",
""
]
] |
0705.0491 | Luca Fanelli | Luca Fanelli, Eugenio Montefusco | On the blow-up threshold for weakly coupled nonlinear Schroedinger
equations | 14 pages | null | 10.1088/1751-8113/40/47/007 | Roma01.Math | math.AP math-ph math.MP | null | We study the Cauchy problem for a system of two coupled nonlinear focusing
Schroedinger equations arising in nonlinear optics. We discuss when the
solutions are global in time or blow-up in finite time. Some results, in
dependence of the data of the problem, are proved; in particular we give a
bound, depending on the coupling parameter, for the blow-up threshold.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 15:57:45 GMT"
}
] | 2016-03-24T00:00:00 | [
[
"Fanelli",
"Luca",
""
],
[
"Montefusco",
"Eugenio",
""
]
] |
0705.0492 | Stefano Roddaro | S.Roddaro, P.Pingue, V.Piazza, V.Pellegrini and F.Beltram | Colors Of Graphite On Silicon Dioxide | 4 pages, 4 figures, abstract reviewed&accepted for presentation at
EP2DS-17 | Nano Lett.; (Letter); 2007; 7(9); 2707-2710, | 10.1021/nl071158l | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Monoatomic layers of graphite can be electrically contacted and used as
building blocks for new promising devices. These experiment are today possible
thanks to the fact that very thin graphite can be identified on a dielectric
substrate using a simple optical microscope. We investigate the mechanism
behind the strong visibility of graphite and we discuss the importance of the
substrate and of the microcope objective used for the imaging.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 19:57:09 GMT"
}
] | 2008-08-21T00:00:00 | [
[
"Roddaro",
"S.",
""
],
[
"Pingue",
"P.",
""
],
[
"Piazza",
"V.",
""
],
[
"Pellegrini",
"V.",
""
],
[
"Beltram",
"F.",
""
]
] |
0705.0493 | Stephen Bailey | S. Bailey, C. Aragon, R. Romano, R.C. Thomas, B.A. Weaver, D. Wong | How to Find More Supernovae with Less Work: Object Classification
Techniques for Difference Imaging | 25 pages; 6 figures; submitted to ApJ | Astrophys.J.665:1246-1253,2007 | 10.1086/519832 | null | astro-ph | null | We present the results of applying new object classification techniques to
difference images in the context of the Nearby Supernova Factory supernova
search. Most current supernova searches subtract reference images from new
images, identify objects in these difference images, and apply simple threshold
cuts on parameters such as statistical significance, shape, and motion to
reject objects such as cosmic rays, asteroids, and subtraction artifacts.
Although most static objects subtract cleanly, even a very low false positive
detection rate can lead to hundreds of non-supernova candidates which must be
vetted by human inspection before triggering additional followup. In comparison
to simple threshold cuts, more sophisticated methods such as Boosted Decision
Trees, Random Forests, and Support Vector Machines provide dramatically better
object discrimination. At the Nearby Supernova Factory, we reduced the number
of non-supernova candidates by a factor of 10 while increasing our supernova
identification efficiency. Methods such as these will be crucial for
maintaining a reasonable false positive rate in the automated transient alert
pipelines of upcoming projects such as PanSTARRS and LSST.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 16:10:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bailey",
"S.",
""
],
[
"Aragon",
"C.",
""
],
[
"Romano",
"R.",
""
],
[
"Thomas",
"R. C.",
""
],
[
"Weaver",
"B. A.",
""
],
[
"Wong",
"D.",
""
]
] |
0705.0494 | Achille A. Nucita | A.A. Nucita, F. De Paolis, G. Ingrosso, A. Qadir and A.F. Zakharov | Sgr A$^*$: a laboratory to measure the central black hole and cluster
parameters | in press on PASP, 2007 | null | 10.1086/517934 | null | astro-ph | null | Several stars orbit around a black hole candidate of mass $3.7\times 10^6$
M$_{\odot}$, in the region of the Galactic Center (GC). Looking for General
Relativistic (GR) periastron shifts is limited by the existence of a stellar
cluster around the black hole that would modify the orbits due to classical
effects that might mask the GR effect. Only if one knows the cluster parameters
(its mass and core radius) it is possible to unequivocally deduce the GR
effects expected and then test them. In this paper it is shown that the
observation of the proper motion of Sgr A$^*$, $v_{Sgr A^*} = (0.4\pm 0.9)$ km
s$^{-1}$ (\citealt{reid2004}), could help us to constrain the cluster
parameters significantly and that future measurements of the periastron shifts
for at least three stars may adequately determine the cluster parameters and
the mass of the black hole.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 16:12:44 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Nucita",
"A. A.",
""
],
[
"De Paolis",
"F.",
""
],
[
"Ingrosso",
"G.",
""
],
[
"Qadir",
"A.",
""
],
[
"Zakharov",
"A. F.",
""
]
] |
0705.0495 | Franz X. Bronold | F. X. Bronold, K. Matyash, D. Tskhakaya, R. Schneider and H. Fehske | Radio-frequency discharges in Oxygen. Part 1: Modeling | 11 pages, 10 figures | J. Phys. D: Appl. Phys. 40 (2007) 6583; published version deviates
slightly from the version given here. | 10.1088/0022-3727/40/21/018 | null | physics.plasm-ph | null | In this series of three papers we present results from a combined
experimental and theoretical effort to quantitatively describe capacitively
coupled radio-frequency discharges in oxygen. The particle-in-cell Monte-Carlo
model on which the theoretical description is based will be described in the
present paper. It treats space charge fields and transport processes on an
equal footing with the most important plasma-chemical reactions. For given
external voltage and pressure, the model determines the electric potential
within the discharge and the distribution functions for electrons, negatively
charged atomic oxygen, and positively charged molecular oxygen. Previously used
scattering and reaction cross section data are critically assessed and in some
cases modified. To validate our model, we compare the densities in the bulk of
the discharge with experimental data and find good agreement, indicating that
essential aspects of an oxygen discharge are captured.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 16:24:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bronold",
"F. X.",
""
],
[
"Matyash",
"K.",
""
],
[
"Tskhakaya",
"D.",
""
],
[
"Schneider",
"R.",
""
],
[
"Fehske",
"H.",
""
]
] |
0705.0496 | Ali Imaanpur | Ali Imaanpur | On Instantons in Holographic QCD | 10 pages, a section added | null | null | null | hep-th | null | We examine instantons and solitons of the effective action of probe D8-branes
in the background of $N_c$ D4-branes which has served as a holographic
description of QCD. We show that the 4d instantons sit at the minimum of the
Euclidean 5d action. Restricting to the static solitons of the five-dimensional
model we are led to consider monopoles in a 3-dimensional curved space. Since
the background metric depends only on the fifth coordinate, it is possible to
reduce the monopole equations to the ones in flat space and write down the
explicit solutions.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 16:29:20 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 12:57:15 GMT"
},
{
"version": "v3",
"created": "Thu, 21 Jun 2007 13:21:07 GMT"
}
] | 2007-06-21T00:00:00 | [
[
"Imaanpur",
"Ali",
""
]
] |
0705.0497 | Franz X. Bronold | F. X. Bronold, K. Matyash, David Tskhakaya, Ralf Schneider, and Holger
Fehske | Particle-based modeling of oxygen discharges | 4 pages, 5 figures, accepted contribution to 28th ICPIG, Prag (2007) | null | null | null | physics.plasm-ph | null | We present an one-dimensional particle-in-cell Monte-Carlo model for
capacitively coupled radio-frequency discharges in oxygen. The model
quantitatively describes the central part of the discharge. For a given voltage
and pressure, it self-consistently determines the electric potential and the
distribution functions for electrons, negatively charged atomic oxygen, and
positively charged molecular oxygen. Previously used collision cross sections
are critically assessed and in some cases modified. Provided associative
detachment due to metastable oxygen molecules is included in the model, the
electro-negativities in the center of the discharge are in excellent agreement
with experiments. Due to lack of empirical data for the cross section of this
process, we propose a simple model and discuss its limitations.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 16:33:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bronold",
"F. X.",
""
],
[
"Matyash",
"K.",
""
],
[
"Tskhakaya",
"David",
""
],
[
"Schneider",
"Ralf",
""
],
[
"Fehske",
"Holger",
""
]
] |
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