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802.0903 | Erik Lucero | Erik Lucero (1), M. Hofheinz (1), M. Ansmann (1), Radoslaw C. Bialczak
(1), N. Katz (1 and 2), Matthew Neeley (1), A. D. O'Connell (1), H. Wang (1),
A. N. Cleland (1), John M. Martinis (1) ((1) Department of Physics,
University of California at Santa Barbara, (2) Department of Physics, Hebrew
University, Jerusalem, Israel) | High-fidelity gates in a Josephson qubit | 5 pages. 5 figures. Submitted to Physical Review Letters | null | 10.1103/PhysRevLett.100.247001 | null | quant-ph | null | We demonstrate new experimental procedures for measuring small errors in a
superconducting quantum bit (qubit). By carefully separating out gate and
measurement errors, we construct a complete error budget and demonstrate single
qubit gate fidelities of 0.98, limited by energy relaxation. We also introduce
a new metrology tool -- a Ramsey interference error filter -- that can measure
the occupation probability of the state $\ket{2}$ down to $10^{-4}$, a
magnitude near the fault tolerant threshold.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 02:23:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lucero",
"Erik",
"",
"1 and 2"
],
[
"Hofheinz",
"M.",
"",
"1 and 2"
],
[
"Ansmann",
"M.",
"",
"1 and 2"
],
[
"Bialczak",
"Radoslaw C.",
"",
"1 and 2"
],
[
"Katz",
"N.",
"",
"1 and 2"
],
[
"Neeley",
"Matthew",
""
],
[
"O'Connell",
"A. D.",
""
],
[
"Wang",
"H.",
""
],
[
"Cleland",
"A. N.",
""
],
[
"Martinis",
"John M.",
""
]
] | [
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] |
802.0904 | Kunihiko Yamaji | K. Yamaji, T. Yanagisawa, M. Miyazaki, R. Kadono | t'- and t"-dependence of the bulk-limit superconducting condensation
energy of the 2D Hubbard model | 12 pages, 6 figures, ISS2007 Proc. (Physica C) | null | 10.1016/j.physc.2008.05.015 | null | cond-mat.supr-con | http://creativecommons.org/licenses/by-nc-sa/3.0/ | The 2D Hubbard model having the 2nd- and 3rd-neighbor transfer energies t'
and t" is investigated by use of the variational Monte Carlo method. At the
nearly optimal doping with on-site Coulomb energy U=6 (energy unit is t) the
condensation energy Econd for the d-wave superconductivity (SC) is computed for
lattices of sizes from 10x10 to 28x28 with the aim to get its bulk-limit value.
t" is fixed at -t'/2. Outside and in the neighborhood of the SDW region of
-0.16=<t'=<-0.08 the SC Econd dominates over the SDW Econd. At t'=-0.05 and
-0.10 we obtained a definitely finite bulk-limit SC Econd of the order of the
experimental value for YBCO. At t'=0 Econd nearly vanishes. For t'=<-0.18, the
SC Econd strongly oscillates as a function of the lattice size, when periodic
boundary conditions (b.c.'s) are imposed to both axes. In the case of periodic
and antiperiodic b.c.'s, a finite bulk-limit value is obtained at t'=-0.22.
Econd tends to vanish with further decrease of t'. With our results the SC of
LSCO is understandable with t'~ -0.10. The t' values of Hg1201, Tl2201 and
Na-CCOC seem close to -0.20 so that they locate in the boundary zone of SC
indicated in the present work. Slightly larger U improves the situation by
increasing Econd.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 02:30:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yamaji",
"K.",
""
],
[
"Yanagisawa",
"T.",
""
],
[
"Miyazaki",
"M.",
""
],
[
"Kadono",
"R.",
""
]
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802.0905 | Marco Zoli | Marco Zoli | Instanton Solution of a Nonlinear Potential in Finite Size | Int. J. Mod. Phys. B (2008) in press | Int.J.Mod.Phys.B22:327-342,2008 | 10.1142/S021797920803865X | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Euclidean path integral method is applied to a quantum tunneling model
which accounts for finite size ($L$) effects. The general solution of the Euler
Lagrange equation for the double well potential is found in terms of Jacobi
elliptic functions. The antiperiodic instanton interpolates between the
potential minima at any finite $L$ inside the quantum regime and generalizes
the well known (anti)kink solution of the infinite size case. The derivation of
the functional determinant, stemming from the quantum fluctuation contribution,
is given in detail. The explicit formula for the finite size semiclassical path
integral is presented.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 16:14:58 GMT"
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] | 2008-11-26T00:00:00 | [
[
"Zoli",
"Marco",
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] |
802.0906 | Akio Inoue | Akio K. Inoue (Osaka Sangyo Univ.), Mitsuhiko Honda (Kanagawa Univ.),
Taishi Nakamoto (Tokyo Inst. Tech.), and Akinori Oka (Tokyo Inst. Tech.) | Observational Possibility of the "Snow Line" on the Surface of
Circumstellar Disks with the Scattered Light | PASJ accepted, single column 16 pages, 5 figures | null | 10.1093/pasj/60.3.557 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how we obtain the spatial distribution of ice on the surface of
the circumstellar disk around young stars. Ice in the disks plays a very
important role in various issues, for instance, on the disk structure, on the
planet formation, on the isotopic anomaly in meteorites, and on the origin of
the sea on the Earth. Therefore, the spatially resolved observation of the
condensation/sublimation front of ice, so-called ``snow line'' is strongly
required. Here, we propose a new method for obtaining the spatially resolved
``snow line'' on the circumstellar disks by observing 3 \micron H$_2$O ice
feature in the scattered light. Based on radiative transfer considerations, we
show that the feature is clearly imprinted in the spectrum of the scattered
light from both optically thick and thin circumstellar disks. We also show that
the scattered light and the H$_2$O ice feature from protoplanetary disks are
detectable and spatially resolvable with the current instruments through a
$H_2O$ narrowband filter around 3 \micron. Finally, we present a diagnostics of
disk dust properties on the $K-H_2O$ and $K-L'$ two color diagram.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 03:20:26 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Inoue",
"Akio K.",
"",
"Osaka Sangyo Univ."
],
[
"Honda",
"Mitsuhiko",
"",
"Kanagawa Univ."
],
[
"Nakamoto",
"Taishi",
"",
"Tokyo Inst. Tech."
],
[
"Oka",
"Akinori",
"",
"Tokyo Inst. Tech."
]
] | [
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802.0907 | H. Antia | K. R. Sivaraman, H. M. Antia, S. M. Chitre, V. V. Makarova | Zonal Velocity Bands and the Solar Activity Cycle | To appear in Solar Physics | null | 10.1007/s11207-008-9172-1 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the zonal flow pattern in subsurface layers of the Sun with the
distribution of surface magnetic features like sunspots and polar faculae. We
demonstrate that in the activity belt, the butterfly pattern of sunspots
coincides with the fast stream of zonal flows, although part of the sunspot
distribution does spill over to the slow stream. At high latitudes, the polar
faculae and zonal flow bands have similar distributions in the spatial and
temporal domains.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 03:49:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sivaraman",
"K. R.",
""
],
[
"Antia",
"H. M.",
""
],
[
"Chitre",
"S. M.",
""
],
[
"Makarova",
"V. V.",
""
]
] | [
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] |
802.0908 | Kentarou Tanabe | Kentarou Tanabe, Shigehiro Nagataki | Higher Order Terms of Kerr Parameter for Blandford-Znajek Monopole
Solution | 7 pages, 2 figures | Phys.Rev.D78:024004,2008 | 10.1103/PhysRevD.78.024004 | YITP-08-6 | astro-ph | null | Blandford-Znajek mechanism, by which the rotational energy of a black hole is
extracted through electromagnetic fields, is one of the promising candidates as
an essential process of the central engine of active compact objects such as
Gamma-Ray Bursts. The only known analytical solution of this mechanism is the
perturbative monopole solution for Kerr parameter a up to the second order
terms. In order to apply Blandford-Znajek mechanism to rapidly rotating black
holes, we try to obtain the perturbation solution up to the fourth order. As a
result, we find that the fourth order terms of the vector potential diverge at
infinity, which implies that the perturbation approach breaks down at large
distance from the black hole. Although there are some uncertainties about the
solution due to the unknown boundary condition at infinity for the fourth order
terms, we can derive the evaluation of the total energy flux extracted from the
black hole up to fourth order of a without any ambiguity. Further more, from
the comparison between the numerical solution that is valid for 0<a<1 and the
fourth order solution, we find that the fourth order solution reproduces the
numerical result better than the second order solution. At the same time, since
the fourth order solution does not match well with numerical result at large a,
we conclude that more higher order terms are required to reproduce the
numerical result.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 06:57:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tanabe",
"Kentarou",
""
],
[
"Nagataki",
"Shigehiro",
""
]
] | [
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] |
802.0909 | George Batrouni | K. Bouadim, G.G. Batrouni, F. Hebert, and R.T. Scalettar | Magnetic and Transport Properties of a Coupled Hubbard Bilayer with
Electron and Hole Doping | null | Phys Rev B77 144527 (2008). | 10.1103/PhysRevB.77.144527 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The single band, two dimensional Hubbard Hamiltonian has been extensively
studied as a model for high temperature superconductivity. While Quantum Monte
Carlo simulations within the dynamic cluster approximation are now providing
considerable evidence for a d-wave superconducting state at low temperature,
such a transition remains well out of reach of finite lattice simulations
because of the "sign problem". We show here that a bilayer Hubbard model, in
which one layer is electron doped and one layer is hole doped, can be studied
to lower temperatures and exhibits an interesting signal of d-wave pairing. The
results of our simulations bear resemblance to a recent report on the magnetic
and superconducting properties of Ba$_2$Ca$_3$Cu$_4$O$_8$F$_2$ which contains
both electron and hole doped CuO$_2$ planes. We also explore the phase diagram
of bilayer models in which each sheet is at half-filling.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 04:43:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bouadim",
"K.",
""
],
[
"Batrouni",
"G. G.",
""
],
[
"Hebert",
"F.",
""
],
[
"Scalettar",
"R. T.",
""
]
] | [
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] |
802.091 | Yanwei Jiang | Yan Wei Jiang, Siming Liu, Vah\'e Petrosian, Christopher L. Fryer | Cascade and Damping of Alfv\'{e}n-Cyclotron Fluctuations: Application to
Solar Wind Turbulence Spectrum | null | Astrophys.J.698:163-183,2009 | 10.1088/0004-637X/698/1/163 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the diffusion approximation, we study the cascade and damping of
Alfv\'{e}n-cyclotron fluctuations in solar plasmas numerically. Motivated by
wave-wave couplings and nonlinear effects, we test several forms of the
diffusion tensor. For a general locally anisotropic and inhomogeneous diffusion
tensor in the wave vector space, the turbulence spectrum in the inertial range
can be fitted with power-laws with the power-law index varying with the wave
propagation direction. For several locally isotropic but inhomogeneous
diffusion coefficients, the steady-state turbulence spectra are nearly
isotropic in the absence of damping and can be fitted by a single power-law
function. However, the energy flux is strongly polarized due to the
inhomogeneity that leads to an anisotropic cascade. Including the anisotropic
thermal damping, the turbulence spectrum cuts off at the wave numbers, where
the damping rates become comparable to the cascade rates. The combined
anisotropic effects of cascade and damping make this cutoff wave number
dependent on the wave propagation direction, and the propagation direction
integrated turbulence spectrum resembles a broken power-law, which cuts off at
the maximum of the cutoff wave numbers or the $^4$He cyclotron frequency.
Taking into account the Doppler effects, the model can naturally reproduce the
broken power-law wave spectra observed in the solar wind and predicts that a
higher break frequency is aways accompanied with a greater spectral index
change that may be caused by the increase of the Alfv\'{e}n Mach number, the
reciprocal of the plasma beta, and/or the angle between the solar wind velocity
and the mean magnetic field. These predictions can be tested by future
observations.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 04:51:15 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Jiang",
"Yan Wei",
""
],
[
"Liu",
"Siming",
""
],
[
"Petrosian",
"Vahé",
""
],
[
"Fryer",
"Christopher L.",
""
]
] | [
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] |
802.0911 | John Voight | John Voight | Shimura curves of genus at most two | 18 pages; typo in table fixed, and errata included | null | 10.1090/S0025-5718-08-02163-7 | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we enumerate all Shimura curves X^D_0(N) of genus at most
two.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 04:57:41 GMT"
},
{
"version": "v2",
"created": "Sun, 7 Nov 2010 16:11:44 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Voight",
"John",
""
]
] | [
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802.0912 | L. A. Falkovsky | L.A. Falkovsky | Symmetry constraints on phonon dispersion in graphene | 5 pages, 2 figures | null | 10.1016/j.physleta.2008.05.085 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Taking into account the constraints imposed by the lattice symmetry, we
calculate the phonon dispersion for graphene with interactions between the
first, second, and third nearest neighbors in the framework of the Born--von
Karman model. Analytical expressions obtained for the dispersion of the
out-of-plane (bending) modes give the nonzero sound velocity. The dispersion of
four in-plane modes is determined by coupled equations. Values of the force
constants are found in fitting with frequencies at critical points and with
elastic constants measured on graphite.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 06:16:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Falkovsky",
"L. A.",
""
]
] | [
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] |
802.0913 | P. V. Elyutin | P.V. Elyutin | Natural line shape | 7 pages, 1 figure, revtex | null | 10.1134/S002136400820006X | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observable line shape of the spontaneous emission depends on the
procedure of atom's excitation. The spectrum of radiation emitted by a
two-level atom excited from the ground state by a pi pulse of the resonant pump
field is calculated for the case when the Rabi frequency is much larger than
the relaxation rate. It is shown that the central part of the spectral
distribution has a standard Lorentzian form, whereas for detunings from the
resonance that are larger than the Rabi frequency the spectral density falls
off faster. The shape of the wings of the spectral line is sensitive to the
form of the pi pulse. The implications for the quantum Zeno effect theory and
for the estimates of the duration of quantum jumps are discussed.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 06:41:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Elyutin",
"P. V.",
""
]
] | [
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802.0914 | Sebastian Roch | Elchanan Mossel and Sebastien Roch and Mike Steel | Shrinkage Effect in Ancestral Maximum Likelihood | null | null | null | null | q-bio.PE cs.CE math.PR math.ST stat.TH | null | Ancestral maximum likelihood (AML) is a method that simultaneously
reconstructs a phylogenetic tree and ancestral sequences from extant data
(sequences at the leaves). The tree and ancestral sequences maximize the
probability of observing the given data under a Markov model of sequence
evolution, in which branch lengths are also optimized but constrained to take
the same value on any edge across all sequence sites. AML differs from the more
usual form of maximum likelihood (ML) in phylogenetics because ML averages over
all possible ancestral sequences. ML has long been known to be statistically
consistent -- that is, it converges on the correct tree with probability
approaching 1 as the sequence length grows. However, the statistical
consistency of AML has not been formally determined, despite informal remarks
in a literature that dates back 20 years. In this short note we prove a general
result that implies that AML is statistically inconsistent. In particular we
show that AML can `shrink' short edges in a tree, resulting in a tree that has
no internal resolution as the sequence length grows. Our results apply to any
number of taxa.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 06:52:44 GMT"
}
] | 2017-07-24T00:00:00 | [
[
"Mossel",
"Elchanan",
""
],
[
"Roch",
"Sebastien",
""
],
[
"Steel",
"Mike",
""
]
] | [
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802.0915 | Afif Siddiki Dr. | A. Siddiki | Distribution of an Ohmic current in the close vicinity of a quantum
point contact | null | null | 10.1088/1742-6596/99/1/012020 | null | cond-mat.mes-hall | null | We present the essential findings of the screening theory of the integer
quantum Hall effect (IQHE) considering a quantum point contact (QPC). Our
approach is to solve the Poisson and the Schroedinger equations
self-consistently, taking into account electron interactions, within a Hartree
type approximation for a two dimensional electron gas (2DEG) subject to high
perpendicular magnetic fields. The Coulomb interaction between the electrons
separates 2DEG into two co-existing regions, namely quasi-metallic compressible
and quasi-insulating incompressible regions, which exhibit peculiar screening
and transport properties. In the presence of an external current, we show that
this current is confined into the incompressible regions where the drift
velocity is finite. In particular, we investigate the distribution of these
incompressible strips and their relation with the quantum Hall plateaus
considering a quasi 1D constriction, i.e. a QPC.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 07:20:11 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 11:23:52 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Siddiki",
"A.",
""
]
] | [
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] |
802.0916 | Gudrun Hiller | Gudrun Hiller, Yosef Nir | Measuring Flavor Mixing with Minimal Flavor Violation at the LHC | 16 pages, 1 figure; power suppression of 4-body stop decay rate
corrected; conclusions unchanged | JHEP 0803:046,2008 | 10.1088/1126-6708/2008/03/046 | DO-TH-08/02, WIS/04/08-Feb-DPP | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mixing between third and second (or first) generation squarks is very
small in supersymmetric models with minimal flavor violation such as gauge-,
anomaly- or gaugino-mediation. An opportunity to measure this mixing will arise
if the lightest stop is close enough in mass to the lightest neutralino, so
that the decays into third generation quarks are kinematically forbidden. We
analyze under which circumstances it might become possible to measure at the
Large Hadron Collider (LHC) the rate of the flavor changing stop decays.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 07:46:06 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Aug 2008 18:04:09 GMT"
}
] | 2010-02-03T00:00:00 | [
[
"Hiller",
"Gudrun",
""
],
[
"Nir",
"Yosef",
""
]
] | [
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] |
802.0917 | Kazunari Iwasaki | Kazunari Iwasaki and Toru Tsuribe | Gravitational Instability of Shocked Interstellar Gas Layers | 12 pages, 21 figures, accepted for publication in PASJ | Publ. Astron. Soc. Japan 60, pp.125-136 (2008) | 10.1093/pasj/60.1.125 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate gravitational instability of shocked gas layers
using linear analysis. An unperturbed state is a self-gravitating isothermal
layer which grows with time by the accretion of gas through shock fronts due to
a cloud-cloud collision. Since the unperturbed state is not static, and cannot
be described by a self-similar solution, we numerically solved the perturbation
equations and directly integrated them over time. We took account of the
distribution of physical quantities across the thickness. Linearized
Rankine-Hugoniot relations were imposed at shock fronts as boundary conditions.
The following results are found from our unsteady linear analysis: the
perturbation initially evolves in oscillatory mode, and begins to grow at a
certain epoch. The wavenumber of the fastest growing mode is given by
$k=2\sqrt{2\pi G\rho_\mathrm{E} {\cal M\mit}}/c_\mathrm{s}$, where
$\rho_\mathrm{E}, c_\mathrm{s}$ and $\cal M\mit$ are the density of parent
clouds, the sound velocity and the Mach number of the collision velocity,
respectively. For this mode, the transition epoch from oscillatory to growing
mode is given by $t_g = 1.2/\sqrt{2\pi G\rho_\mathrm{E} {\cal M\mit}}$. The
epoch at which the fastest growing mode becomes non-linear is given by
$2.4\delta_0^{-0.1}/\sqrt{2\pi G \rho_\mathrm{E}{\cal M\mit}}$, where
$\delta_0$ is the initial amplitude of the perturbation of the column density.
As an application of our linear analysis, we investigate criteria for
collision-induced fragmentation. Collision-induced fragmentation will occur
only when parent clouds are cold, or $\alpha_0=5c_\mathrm{s}^2 R/2G M < 1$,
where $R$ and $M$ are the radius and the mass of parent clouds, respectively.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 07:46:52 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Iwasaki",
"Kazunari",
""
],
[
"Tsuribe",
"Toru",
""
]
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802.0918 | Alexander Klyachko | M. Altunbulak, A. Klyachko | The Pauli principle revisited | 38 pages, submitted to Communications in Mathematical Physics | null | 10.1007/s00220-008-0552-z | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By the Pauli exclusion principle no quantum state can be occupied by more
than one electron. One can put it as a constraint on the electron density
matrix that bounds its eigenvalues by 1. Shortly after its discovery the Pauli
principle has been replaced by skew symmetry of a multi-electron wave function.
In this paper we solve a longstanding problem about the impact of this
replacement on the electron density matrix, that goes far beyond the original
Pauli principle.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 08:03:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Altunbulak",
"M.",
""
],
[
"Klyachko",
"A.",
""
]
] | [
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802.0919 | Barak Weiss | John Smillie and Barak Weiss | Finiteness results for flat surfaces: large cusps and short geodesics | null | null | null | null | math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For fixed g and T we show that finiteness of the set of affine equivalence
classes of flat surfaces of genus g whose Veech groups contain a cusp of
hyperbolic co-area less than T. We obtain new restrictions on Veech groups: we
show that any non-elementary Veech group can appear only finitely many times in
a fixed stratum, that any non-elementary Veech group is of finite index in its
normalizer, and that the quotient of the upper half plane by a non-lattice
Veech group contains arbitrarily large embedded disks. These are proved using
the finiteness of the set of affine equivalence classes of flat surfaces of
genus g whose Veech group contains a hyperbolic element with eigenvalue less
than T.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 08:07:02 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Smillie",
"John",
""
],
[
"Weiss",
"Barak",
""
]
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802.092 | Takuya Okabe | Takuya Okabe | Fermi Surface Effect on Lorenz Number of Correlated Metal | 6pages, 4figures | null | null | null | cond-mat.str-el | http://creativecommons.org/licenses/by/3.0/ | We investigate an effect that an ideal Lorenz number $L_{\rm i}$ of
correlated metal shows peculiar Fermi surface dependence, which is caused by
the onset of a particular channel of Umklapp scattering. We evaluate $L_{\rm
i}$ for some simple models and transition metals, and note that $L_{\rm i}$ for
Na$_x$CoO$_2$ decreases sensitively as $x$ approaches an Umklapp threshold
around $x_c \simeq 0.6$.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 08:14:58 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Sep 2008 12:34:22 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Okabe",
"Takuya",
""
]
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802.0921 | David Krejcirik | David Krejcirik and Milos Tater | Non-Hermitian spectral effects in a PT-symmetric waveguide | 17 pages, LaTeX with 7 EPS figures. Contrary to a version to appear
in J. Phys. A, this one contains the figures in colour. | J. Phys. A: Math. Theor. 41 (2008) 244013. | 10.1088/1751-8113/41/24/244013 | null | math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a numerical study of the spectrum of the Laplacian in an unbounded
strip with PT-symmetric boundary conditions. We focus on non-Hermitian features
of the model reflected in an unusual dependence of the eigenvalues below the
continuous spectrum on various boundary-coupling parameters.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 08:18:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Krejcirik",
"David",
""
],
[
"Tater",
"Milos",
""
]
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] |
802.0922 | Emmanuel Russ | Nadine Badr (LM-Orsay), Emmanuel Russ (LATP) | Interpolation of Sobolev spaces, Littlewood-Paley inequalities and Riesz
transforms on graphs | null | Publicacions Matem\`atiques 53, 2 (2009) 273-328 | null | null | math.AP | null | Let $\Gamma$ be a graph endowed with a reversible Markov kernel $p$, and $P$
the associated operator, defined by $Pf(x)=\sum_y p(x,y)f(y)$. Denote by
$\nabla$ the discrete gradient. We give necessary and/or sufficient conditions
on $\Gamma$ in order to compare $\Vert \nabla f \Vert_{p}$ and $\Vert
(I-P)^{1/2}f \Vert_{p}$ uniformly in $f$ for $1<p<+\infty$. These conditions
are different for $p<2$ and $p>2$. The proofs rely on recent techniques
developed to handle operators beyond the class of Calder\'on-Zygmund operators.
For our purpose, we also prove Littlewood-Paley inequalities and interpolation
results for Sobolev spaces in this context, which are of independent interest.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 08:24:55 GMT"
}
] | 2010-09-13T00:00:00 | [
[
"Badr",
"Nadine",
"",
"LM-Orsay"
],
[
"Russ",
"Emmanuel",
"",
"LATP"
]
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] |
802.0923 | Jean-Jacques Sinou | Benjamin Herv\'e (LTDS), Jean-Jacques Sinou (LTDS), Herv\'e Mah\'e,
Louis Jezequel (LTDS) | Analysis of squeal noise and mode coupling instabilities including
damping and gyroscopic effects | null | European Journal of Mechanics - A/Solids 27, 2 (2008) 141-160 | 10.1016/j.euromechsol.2007.05.004 | null | physics.class-ph math.DS | null | This paper deals with an audible disturbance known as automotive clutch
squeal noise from the viewpoint of friction-induced mode coupling instability.
Firstly, an auto-coupling model is presented showing a non-conservative
circulatory effect originating from friction forces. Secondly, the stability of
an equilibrium is investigated by determining the eigenvalues of the system
linearized equations. The effects of the circulatory and gyroscopic actions are
examined analytically and numerically to determine their influence on the
stability region. Separate and combined effects are analysed with and without
structural damping and important information is obtained on the role of each
parameter and their interactions regarding overall stability. Not only is
structural damping shown to be of primary importance, as reported in many
previous works, this article also highlights a particular relationship with
gyroscopic effects. A method of optimizing both the stability range and its
robustness with respect to uncertainty on system parameters is discussed after
which practical design recommendations are given.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 08:26:00 GMT"
}
] | 2012-09-28T00:00:00 | [
[
"Hervé",
"Benjamin",
"",
"LTDS"
],
[
"Sinou",
"Jean-Jacques",
"",
"LTDS"
],
[
"Mahé",
"Hervé",
"",
"LTDS"
],
[
"Jezequel",
"Louis",
"",
"LTDS"
]
] | [
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] |
802.0924 | Maths Karlsson | M. Karlsson, A. Matic, D. Engberg, M.E. Bj\"orketun, M.M. Koza, I.
Ahmed, G. Wahnstr\"om, P. Berastegui, L. B\"orjesson and S. Eriksson | Quasielastic neutron scattering of hydrated BaZr_{0.90}A_{0.10}O_{2.95}
(A = Y and Sc) | 8 pages, 7 figures, 2 tables | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proton motions in hydrated proton conducting perovskites
BaZr_{0.90}A_{0.10}O_{2.95} (A = Y and Sc) have been investigated using
quasielastic neutron scattering. The results reveal a localized motion on the
ps time scale and with an activation energy of ~10-30 meV, in both materials.
The temperature dependence of the total mean square displacement of the protons
suggests an onset of this motion at a temperature of about 300 K. Comparison of
the QENS results to density functional theory calculations suggests that for
both materials this motion can be ascribed to intra-octahedral proton transfers
occurring close to a dopant atom. The low activation energy, more than ten
times lower than the activation energy for the macroscopic proton conductivity,
suggests that this motion is not the rate-limiting process for the long-range
proton diffusion, i.e. it is not linked to the two materials significantly
different proton conductivities.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 08:39:49 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Karlsson",
"M.",
""
],
[
"Matic",
"A.",
""
],
[
"Engberg",
"D.",
""
],
[
"Björketun",
"M. E.",
""
],
[
"Koza",
"M. M.",
""
],
[
"Ahmed",
"I.",
""
],
[
"Wahnström",
"G.",
""
],
[
"Berastegui",
"P.",
""
],
[
"Börjesson",
"L.",
""
],
[
"Eriksson",
"S.",
""
]
] | [
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] |
802.0925 | Marcin Dumnicki | Marcin Dumnicki | Regularity and non-emptyness of linear systems in $\mathbb P^n$ | 11 pages, 2 figures | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main goal of this paper is to present a new algorithm bounding the
regularity and ``alpha'' (the lowest degree of existing hypersurface) of a
linear system of hypersurfaces (in $\mathbb P^n$) passing through multiple
points in general position. To do the above we formulate and prove new theorem,
which allows to show non-specialty of linear system by splitting it into
non-special (and simpler) systems. As a result we give new bounds for multiple
point Seshadri constants on $\PP^2$.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 08:56:05 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Dumnicki",
"Marcin",
""
]
] | [
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] |
802.0926 | Zenghu Li | Zenghu Li, Jie Xiong | Continuous local time of a purely atomic immigration superprocess with
dependent spatial motion | null | Stochastic Analysis and Applications 25 (2007), 6: 1273-1296 | null | null | math.PR math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A purely atomic immigration superprocess with dependent spatial motion in the
space of tempered measures is constructed as the unique strong solution of a
stochastic integral equation driven by Poisson processes based on the excursion
law of a Feller branching diffusion, which generalizes the work of Dawson and
Li (2003). As an application of the stochastic equation, it is proved that the
superprocess possesses a local time which is Holder continuous of order
$\alpha$ for every $\alpha< 1/2$. We establish two scaling limit theorems for
the immigration superprocess, from which we derive scaling limits for the
corresponding local time.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:10:13 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Li",
"Zenghu",
""
],
[
"Xiong",
"Jie",
""
]
] | [
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] |
802.0927 | Sijme-Jan Paardekooper | S.-J. Paardekooper, P. Thebault, G. Mellema | Planetesimal and gas dynamics in binaries | 18 pages, 13 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13080.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations of extrasolar planets reveal that planets can be found in close
binary systems, where the semi-major axis of the binary orbit is less than 20
AU. The existence of these planets challenges planet formation theory, because
the strong gravitational perturbations due to the companion increase encounter
velocities between planetesimals and make it difficult for them to grow through
accreting collisions. We study planetesimal encounter velocities in binary
systems, where the planetesimals are embedded in a circumprimary gas disc that
is allowed to evolve under influence of the gravitational perturbations of the
companion star. We find that the encounter velocities between planetesimals of
different size strongly depend on the gas disc eccentricity. In all cases
studied, inclusion of the full gas dynamics increases the encounter velocity
compared to the case of a static, circular gas disc. Full numerical parameter
exploration is still impossible, but we derive analytical formulae to estimate
encounter velocities between bodies of different sizes given the gas disc
eccentricity. The gas dynamical evolution of a protoplanetary disc in a binary
system tends to make planetesimal accretion even more difficult than in a
static, axisymmetric gas disc.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:19:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Paardekooper",
"S. -J.",
""
],
[
"Thebault",
"P.",
""
],
[
"Mellema",
"G.",
""
]
] | [
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] |
802.0928 | Sergey Sazonov | S. Sazonov, M. Revnivtsev, R. Burenin, E. Churazov, R. Sunyaev, W.R.
Forman, S.S. Murray | Discovery of heavily-obscured AGN among 7 INTEGRAL hard X-ray sources
observed by Chandra | 10 pages, 3 figures. Revised version accepted for publication in A&A | null | 10.1051/0004-6361:200809528 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We observed 7 INTEGRAL sources with the Chandra X-ray Observatory to refine
their localization to ~2 arcsec and to study their X-ray spectra. Two sources
are inferred to have a Galactic origin: IGR J08390-4833 is most likely a
magnetic cataclysmic variable with a white dwarf spin period ~1,450 s; and IGR
J21343+4738 is a high-mass X-ray binary. Five sources (IGR J02466-4222, IGR
J09522-6231, IGR J14493-5534, IGR J14561-3738, and IGR J23523+5844) prove to be
AGN with significant intrinsic X-ray absorption along the line of sight. Their
redshifts and hard X-ray (17-60 keV) luminosities range from 0.025 to 0.25 and
from ~2x10^43 to ~2x10^45 erg/s, respectively, with the distance to IGR
J14493-5534 remaining unknown. The sources IGR J02466-4222 and IGR J14561-3738
are likely Compton-thick AGN with absorption column densities NH>10^24 cm^-2,
and the former further appears to be one of the nearest X-ray bright,
optically-normal galaxies. With the newly-identified sources, the number of
heavily-obscured (NH>10^24 cm^-2) AGN detected by INTEGRAL has increased to
~10. Therefore, such objects constitute 10-15% of hard X-ray bright, non-blazar
AGN in the local Universe. The small ratio (<<1%) of soft (0.5-8.0 keV) to hard
(17-60 keV) band fluxes (Chandra to INTEGRAL) and the non-detection of optical
narrow-line emission in some of the Compton-thick AGN in our sample suggests
that there is a new class of objects in which the central massive black hole
may be surrounded by a geometrically-thick dusty torus with a narrow ionization
cone.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:20:27 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jun 2008 15:34:57 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Sazonov",
"S.",
""
],
[
"Revnivtsev",
"M.",
""
],
[
"Burenin",
"R.",
""
],
[
"Churazov",
"E.",
""
],
[
"Sunyaev",
"R.",
""
],
[
"Forman",
"W. R.",
""
],
[
"Murray",
"S. S.",
""
]
] | [
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802.0929 | Stefan Typel | S. Typel | Pseudospin, supersymmetry and the shell structure of atomic nuclei | 33 pages, 1 table, 6 figures, additional references, minor
corrections, note added in proof, accepted for publication in Nuclear Physics
A | Nucl.Phys.A806:156-178,2008 | 10.1016/j.nuclphysa.2008.03.018 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of single-particle energies with varying isospin asymmetry in
the shell model is an important issue when predicting changes in the shell
structure for exotic nuclei. In many cases pseudospin partner levels, that are
almost degenerate in energy for stable nuclei, are relevant in extracting the
size of the shell gaps. A breaking of the pseudospin symmetry can affect the
size of these gaps and change the magic numbers accordingly. The strength of
the pseudospin splitting is expected to depend in particular on
isovector-dependent and tensor contributions to the effective nuclear
interaction. A description employing supersymmetric quantum mechanics allows to
derive a pseudospin symmetry breaking potential that is regular in contrast to
the pseudospin-orbit potential in the conventional relativistic treatment. The
derived perturbation potential provides a measure to quantify the symmetry
breaking and it can be employed to improve mean-field calculations in order to
better reproduce the experimentally observed shell evolution. General
potentials with exact pseudospin symmetry are obtained that can be used in
relativistic mean-field Hamiltonians.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:24:27 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Apr 2008 07:30:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Typel",
"S.",
""
]
] | [
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802.093 | Merav Dolev - | M. Dolev, M. Heiblum, V. Umansky, Ady Stern, and D. Mahalu | Towards identification of a non-abelian state: observation of a quarter
of electron charge at $\nu=5/2$ quantum Hall state | null | Nature 452, 829 (2008) | 10.1038/nature06855 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fractional quantum Hall effect, where plateaus in the Hall resistance at
values of coexist with zeros in the longitudinal resistance, results from
electron correlations in two dimensions under a strong magnetic field. Current
flows along the edges carried by charged excitations (quasi particles) whose
charge is a fraction of the electron charge. While earlier research
concentrated on odd denominator fractional values of $\nu$, the observation of
the even denominator $\nu=5/2$ state sparked a vast interest. This state is
conjectured to be characterized by quasiparticles of charge e/4, whose
statistics is non-abelian. In other words, interchanging of two quasi particles
may modify the state of the system to an orthogonal one, and does not just add
a phase as in for fermions or bosons. As such, these quasiparticles may be
useful for the construction of a topological quantum computer. Here we report
data of shot noise generated by partitioning edge currents in the $\nu=5/2$
state, consistent with the charge of the quasiparticle being e/4, and
inconsistent with other potentially possible values, such as e/2 and e. While
not proving the non-abelian nature of the $\nu=5/2$ state, this observation is
the first step toward a full understanding of these new fractional charges.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:26:41 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Dolev",
"M.",
""
],
[
"Heiblum",
"M.",
""
],
[
"Umansky",
"V.",
""
],
[
"Stern",
"Ady",
""
],
[
"Mahalu",
"D.",
""
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] |
802.0931 | Olivier Ley | Olivier Ley (LMPT) | Weak Solutions for Dislocation Type Equations | null | International Conference for the 25th Anniversary of Viscosity
Solutions, Tokyo : Japon (2007) | null | null | math.AP | null | We describe recent results obtained by G. Barles, P. Cardaliaguet, R. Monneau
and the author recently. They are concerned with nonlocal Eikonal equations
arising in the study of the dynamics of dislocation lines in crystals. These
equations are nonlocal but also non monotone. We use a notion of weak solution
to provide solutions for all time. Then, we discuss the link between these weak
solutions and the classical viscosity solutions, and state some uniqueness
results in particular cases. A counter-example to uniqueness is given.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:41:10 GMT"
}
] | 2009-02-13T00:00:00 | [
[
"Ley",
"Olivier",
"",
"LMPT"
]
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] |
802.0932 | Olivier Ley | Fabio Camilli, Olivier Ley (LMPT), Paola Loreti (MeMoMat) | Homogenization of monotone systems of Hamilton-Jacobi equations | null | ESAIM: Control, Optimisation and Calculus of Variations 16 (2010)
58-76 | 10.1051/cocv:2008061 | null | math.AP | null | In this paper we study homogenization for a class of monotone systems of
first-order time-dependent periodic Hamilton-Jacobi equations. We characterize
the Hamiltonians of the limit problem by appropriate cell problems. Hence we
show the uniform convergence of the solution of the oscillating systems to the
bounded uniformly continuous solution of the homogenized system.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:41:54 GMT"
}
] | 2010-02-10T00:00:00 | [
[
"Camilli",
"Fabio",
"",
"LMPT"
],
[
"Ley",
"Olivier",
"",
"LMPT"
],
[
"Loreti",
"Paola",
"",
"MeMoMat"
]
] | [
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] |
802.0933 | Zenghu Li | Zongfei Fu, Zenghu Li | Stochastic equations of non-negative processes with jumps | null | null | null | null | math.PR math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study stochastic equations of non-negative processes with jumps. The
existence and uniqueness of strong solutions are established under Lipschitz
and non-Lipschitz conditions. The comparison property of two solutions are
proved under suitable conditions. The results are applied to stochastic
equations driven by one-sided Levy processes and those of continuous state
branching processes with immigration.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:46:39 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Fu",
"Zongfei",
""
],
[
"Li",
"Zenghu",
""
]
] | [
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802.0934 | David Bugg | D.V. Bugg (Queen Mary, University of London, UK) | How Resonances can synchronise with Thresholds | 19 pages, 6 figures. Replaces 0709.1254 | J.Phys.G35:075005,2008 | 10.1088/0954-3899/35/7/075005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism by which a threshold may capture a resonance is examined. It
involves a threshold cusp interfering constructively with either or both (i) a
resonance produced via confinement, (ii) attractive t- and u-channel exchanges.
The fo(980), X(3872) and Z(4430) are studied in detail. The fo(980) provides a
valuable model of the locking mechanism. The X(3872) is too narrow to be fitted
by a cusp, and requires either a resonance or virtual state. The Z(4430) can be
fitted as a resonance but also can be fitted successfully by a cusp with no
nearby resonant pole.
| [
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"D. V.",
"",
"Queen Mary, University of London, UK"
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802.0935 | Kluson Josef | J. Kluson | Note About String with Euclidean World-Sheet in AdS(5)xS(5) | 18 pages | null | 10.1088/1751-8113/41/28/285402 | null | hep-th | null | This note is devoted to the study of the classical solutions on the bosonic
string with euclidean world-sheet in AdS(5)xS(5). We generalize solutions
presented in arXiv:0707.4254 [hep-th] to the case where we include the dynamics
of the string on S(5) as well.
| [
{
"version": "v1",
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] | 2009-11-13T00:00:00 | [
[
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"J.",
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802.0936 | M. Alessandra Papa | M. Alessandra Papa | Progress towards Gravitational Wave Astronomy | Based on a talk presented at the joint "18th International Conference
on General Relativity and Gravitation" and "7th Amaldi Conference on
Gravitational Waves", 8-13 July 2007, Sydney, Australia | Class.Quant.Grav.25:114009,2008 | 10.1088/0264-9381/25/11/114009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I will review the most recent and interesting results from gravitational wave
detection experiments, concentrating on recent results from the LIGO Scientific
Collaboration (LSC). I will outline the methodologies utilized in the searches,
explain what can be said in the case of a null result, what quantities may be
constrained. I will compare these results with prior expectations and discuss
their significance. As I go along I will outline the prospects for future
improvements.
| [
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] | 2008-11-26T00:00:00 | [
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802.0937 | Harald Fritzsch | H. Fritzsch | Flavor Symmetries, Neutrino Masses and Neutrino Mixing | 4 pages | Int.J.Mod.Phys.A23:3179-3182,2008 | 10.1142/S0217751X08041773 | LMU-ASC 02 / 08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the neutrino mixing, using the texture 0 mass matrices, which work
very well for the quarks. The solar mixing angle is directly linked to the mass
ratio of the first two neutrinos. The neutrino masses are hierarchical, but the
mass ratios turn out to be much smaller than for quarks. The atmospheric mixing
angle is 38$^{\circ}$. The CP violation for leptons should be much smaller than
for quarks.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 09:58:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fritzsch",
"H.",
""
]
] | [
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] |
802.0938 | Elena Khomenko | E. Khomenko, R. Centeno, M. Collados and J. Trujillo Bueno | Channeling 5-min photospheric oscillations into the solar outer
atmosphere through small-scale vertical magnetic flux tubes | accepted by ApJL | null | 10.1086/587057 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report two-dimensional MHD simulations which demonstrate that photospheric
5-min oscillations can leak into the chromosphere inside small-scale vertical
magnetic flux tubes. The results of our numerical experiments are compatible
with those inferred from simultaneous spectropolarimetric observations of the
photosphere and chromosphere obtained with the Tenerife Infrared Polarimeter
(TIP) at 10830 A. We conclude that the efficiency of energy exchange by
radiation in the solar photosphere can lead to a significant reduction of the
cut-off frequency and may allow for the propagation of the 5 minutes waves
vertically into the chromosphere.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 10:16:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Khomenko",
"E.",
""
],
[
"Centeno",
"R.",
""
],
[
"Collados",
"M.",
""
],
[
"Bueno",
"J. Trujillo",
""
]
] | [
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802.0939 | Mario La Camera | M. La Camera | On the classical confinement of test particles to a thin 3-brane in the
absence of non-gravitational forces | 12 pages, version to appear in MPLA | Mod.Phys.Lett.A23:2727-2736,2008 | 10.1142/S0217732308027503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical confinement condition of test particles to a brane universe in
the absence of non-gravitational forces is transformed using the
Hamilton-Jacobi formalism. The transformed condition provides a direct
criterion for selecting in a cosmological scenario 5D bulk manifolds wherein it
is possible to obtain confinement of trajectories to 4D hypersurfaces purely
due to classical gravitational effects.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 10:23:16 GMT"
},
{
"version": "v2",
"created": "Wed, 14 May 2008 09:20:08 GMT"
},
{
"version": "v3",
"created": "Wed, 18 Jun 2008 08:51:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"La Camera",
"M.",
""
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802.094 | Razvan-Gheorghe Gurau | Razvan Gurau | La renormalisation dans la theorie non commutative des champs | PhD thesis, french, 220 pages | null | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non commutative quantum field theory is a possible candidate for the
quantization of gravity. In our thesis we study in detail the $\phi 4$ model on
the Moyal plane with an harmonic potential. Introduced by Grosse and
Wulkenhaar, this model exhibits the Langmann-Szabo duality not only for the
vertex but also for the propagator. We have obtained several results concerning
this model. We have proved the renormalisability of this theory at all orders
in the position space. We have introduced the parametric and Complete Mellin
representation for the model. Furthermore we have proved that the coupling
constant has a bounded flow at all orders in perturbation theory. Finally we
have achieved the dimensional regularization and renormalization of the model.
Further possible studies include the study of gauge theory on the Moyal plane
and there possible applications for the quantization of gravity. The
connections with string theory and loop quantum gravity should also be
investigated.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 10:37:07 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Gurau",
"Razvan",
""
]
] | [
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] |
802.0941 | Fabio Iocco | Fabio Iocco | Dark Matter capture and annihilation on the First Stars: preliminary
estimates | One table (with data for actual ZAMS metal-free stars) added with
respect to published version | Astrophys.J.677:L1-L4,2008 | 10.1086/587959 | null | astro-ph hep-ph | null | Assuming that Dark Matter is dominated by WIMPs, it accretes by gravitational
attraction and scattering over baryonic material and annihilates inside
celestial objects, giving rise to a "Dark Luminosity" which may potentially
affect the evolution of stars. We estimate the Dark Luminosity achieved by
different kinds of stars in a halo with DM properties characteristic of the
ones where the first star formation episode occurs. We find that either
massive, metal-free and small, galactic-like stars can achieve Dark
Luminosities comparable or exceeding their nuclear ones. This might have
dramatic effects over the evolution of the very first stars, known as
Population III.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 10:51:02 GMT"
},
{
"version": "v2",
"created": "Sun, 10 Feb 2008 13:06:33 GMT"
},
{
"version": "v3",
"created": "Fri, 11 Apr 2008 15:48:15 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Iocco",
"Fabio",
""
]
] | [
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802.0942 | Francesco Cianfrani dr | Giovanni Montani, Francesco Cianfrani | General Relativity as Classical Limit of Evolutionary Quantum Gravity | 23 pages, to appear on Class. Quant. Grav | Class.Quant.Grav.25:065007,2008 | 10.1088/0264-9381/25/6/065007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the dynamics of the gravitational field when the covariance is
restricted to a synchronous gauge. In the spirit of the Noether theorem, we
determine the conservation law associated to the Lagrangian invariance and we
outline that a non-vanishing behavior of the Hamiltonian comes out. We then
interpret such resulting non-zero ``energy'' of the gravitational field in
terms of a dust fluid. This new matter contribution is co-moving to the slicing
and it accounts for the ``materialization'' of a synchronous reference from the
corresponding gauge condition. Further, we analyze the quantum dynamics of a
generic inhomogeneous Universe as described by this evolutionary scheme,
asymptotically to the singularity. We show how the phenomenology of such a
model overlaps the corresponding Wheeler-DeWitt picture. Finally, we study the
possibility of a Schr\"odinger dynamics of the gravitational field as a
consequence of the correspondence inferred between the ensemble dynamics of
stochastic systems and the WKB limit of their quantum evolution. We demonstrate
that the time dependence of the ensemble distribution is associated with the
first order correction in $\hbar$ to the WKB expansion of the energy spectrum.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 10:40:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Montani",
"Giovanni",
""
],
[
"Cianfrani",
"Francesco",
""
]
] | [
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] |
802.0943 | Toru Tsuribe | T. Tsuribe (Osaka U.) and K. Omukai (NAOJ) | Physical Mechanism for the Intermediate Characteristic Stellar Mass in
the Extremely Metal-poor Environments | 4 pages, 3 figures, ApJ Letters in press | null | 10.1086/587035 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If a significant fraction of metals is in dust, star-forming cores with
metallicity higher than a critical value ~10^{-6}-10^{-5}Z_sun are able to
fragment by dust cooling, thereby producing low-mass cores. Despite being above
the critical metallicity, a metallicity range is found to exist around
10^{-5}-10^{-4}Z_sun where low-mass fragmentation is prohibited. In this range,
three-body H_2 formation starts at low (~100K) temperature and thus the
resulting heating causes a dramatic temperature jump, which makes the central
part of the star-forming core transiently hydrostatic and thus highly
spherical. With little elongation, the core does not experience fragmentation
in the subsequent dust-cooling phase. The minimum fragmentation mass is set by
the Jeans mass just before the H_2 formation heating, and its value can be as
high as ~10M_sun. For metallicity higher than ~10^{-4}Z_sun, H_2 formation is
almost completed by the dust-surface reaction before the onset of the
three-body reaction, and low-mass star formation becomes possible. This
mechanism might explain the higher characteristic mass of metal-poor stars than
in the solar neighborhood presumed from the statistics of carbon-enhanced
stars.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 10:45:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tsuribe",
"T.",
"",
"Osaka U."
],
[
"Omukai",
"K.",
"",
"NAOJ"
]
] | [
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] |
802.0944 | Nicki Mennekens | N. Mennekens, J.-P. De Greve, W. Van Rensbergen, L. R. Yungelson | On the origin and evolutionary state of RZ Cas, KO Aql and S Equ | 4 pages, 2 figures, accepted for publication in A&A; accepted version | A&A 486, 919--921 (2008) | 10.1051/0004-6361:200809530 | null | astro-ph | null | Aims. Determination of the present evolutionary state and the restrictions on
the initial mass ratios of RZ Cas, KO Aql and S Equ. Methods. Comparison of
mass gaining stars with evolutionary models of single stars with the same mass
and subsequent comparison with accretion tracks from simultaneous conservative
binary evolution. Results. The gainers are in an early main sequence stage (Xc
greater than 0.5), with KO Aql being almost unevolved (assuming quasi-thermal
equilibrium). The initial donor/gainer mass ratios Mdi/Mgi must be larger than
three to obtain the present mass and luminosity of the gainers.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:33:56 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 19:08:52 GMT"
},
{
"version": "v3",
"created": "Tue, 6 May 2008 07:55:00 GMT"
}
] | 2008-07-29T00:00:00 | [
[
"Mennekens",
"N.",
""
],
[
"De Greve",
"J. -P.",
""
],
[
"Van Rensbergen",
"W.",
""
],
[
"Yungelson",
"L. R.",
""
]
] | [
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] |
802.0945 | Nuno Peres | N. M. R. Peres and F. Sols | Transmission through a defect in polyacene: the extreme limit of ultra
narrow graphene | null | J. Phys.: Condens. Matter 20, 255207 (2008) | 10.1088/0953-8984/20/25/255207 | null | cond-mat.mes-hall cond-mat.dis-nn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the transmission of an electron through an impurity in polyacene.
An analytical expression for the transmission coefficient is found. For
simplicity the disorder is confined to a single unit cell, but the
generalization to several unit cells is straightforward. Both on-site and
off-diagonal defects are considered. When the impurity preserves the inversion
symmetry around the central axis, the scattering problem can be reduced to that
of two independent chains with an alternating sequence of two types of atoms.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 11:00:42 GMT"
},
{
"version": "v2",
"created": "Mon, 19 May 2008 12:43:58 GMT"
}
] | 2008-05-19T00:00:00 | [
[
"Peres",
"N. M. R.",
""
],
[
"Sols",
"F.",
""
]
] | [
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] |
802.0946 | Isabel M. C. Salavessa | Guanghan Li, Isabel M.C. Salavessa | Bernstein-Heinz-Chern results in calibrated manifolds | v5: Final version, accepted for Publication in Rev. Mat.
Iberoamericana. v3:We add a subsection on the foliation calibration,
generalizing results of Barbosa, Kenmotsu and Oshikiri to higer codimension.
We add several results and give conditions to conclude the submanifold is
totally geodesic | Rev. Mat. Iberoamericana Volume 26, Number 2 (2010), 651-692 | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given $(\bar{M},\Omega)$ a calibrated Riemannian manifold with a parallel
calibration of rank $m$, and $M^m$ an immersed orientable submanifold with
parallel mean curvature $H$ we prove that if $\cos \theta$ is bounded away from
zero, where $\theta$ is the $\Omega$-angle of $M$, and if $M$ has zero Cheeger
constant, then $M$ is minimal. In the particular case $M$ is complete with
$Ricc^M\geq 0$ we may replace the boundedness condition on $\cos \theta$ by
$\cos \theta\geq Cr^{-\beta}$, when $r\to +\infty$, where $ 0\leq\beta <1 $ and
$C > 0$ are constants and $r$ is the distance function to a point in $M$. Our
proof is surprisingly simple and extends to a very large class of submanifolds
in calibrated manifolds, in a unified way, the problem started by Heinz and
Chern of estimating the mean curvature of graphic hypersurfaces in Euclidean
spaces. It is based on a estimation of $\|H\|$ in terms of $\cos\theta$ and an
isoperimetric inequality. We also give some conditions to conclude $M$ is
totally geodesic. We study some particular cases.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:37:42 GMT"
},
{
"version": "v2",
"created": "Sun, 3 Aug 2008 00:15:59 GMT"
},
{
"version": "v3",
"created": "Tue, 23 Sep 2008 09:23:10 GMT"
},
{
"version": "v4",
"created": "Fri, 26 Sep 2008 09:26:33 GMT"
},
{
"version": "v5",
"created": "Tue, 7 Apr 2009 14:43:41 GMT"
}
] | 2010-08-13T00:00:00 | [
[
"Li",
"Guanghan",
""
],
[
"Salavessa",
"Isabel M. C.",
""
]
] | [
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] |
802.0947 | Christian Berg | Christian Berg (University of Copenhagen), Antonio J. Dur\'an
(Universidad de Sevilla) | Iteration of the rational function z-1/z and a Hausdorff moment sequence | null | null | null | null | math.CV math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper we considered a positive function f, uniquely determined
for s>0 by the requirements f(1)=1, log(1/f) is convex and the functional
equation f(s)=psi(f(s+1)) with psi(s)=s-1/s. We prove that the meromorphic
extension of f to the whole complex plane is given by the formula
f(z)=lim_{n\to\infty}psi^{\circ n}(lambda_n(lambda_{n+1}/lambda_n)^z), where
the numbers lambda_n are defined by lambda_0=0 and the recursion
lambda_{n+1}=(1/2)(lambda_n+sqrt{lambda_n^2+4}). The numbers m_n=1/lambda_{n+1}
form a Hausdorff moment sequence of a probability measure \mu such that \int
t^{z-1}d\mu(t)=1/f(z)
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 11:12:52 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Berg",
"Christian",
"",
"University of Copenhagen"
],
[
"Durán",
"Antonio J.",
"",
"Universidad de Sevilla"
]
] | [
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] |
802.0948 | Gautam Gangopadhyay | Madhubrata Bhattacharya and G. Gangopadhyay | Cluster decay in very heavy nuclei in Relativistic Mean Field | To appear in Physical Review C | Phys.Rev.C77:027603,2008 | 10.1103/PhysRevC.77.027603 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exotic cluster decay of very heavy nuclei has been studied in the microscopic
Super-Asymmetric Fission Model. Relativistic Mean Field model with the force
FSU Gold has been employed to obtain the densities of the cluster and the
daughter nuclei. The microscopic nuclear interaction DDM3Y1, which has an
exponential density dependence, and the Coulomb interaction have been used in
the double folding model to obtain the potential between the cluster and the
daughter. Half life values have been calculated in the WKB approximation and
the spectroscopic factors have been extracted. The latter values are seen to
have a simple dependence of the mass of the cluster as has been observed
earlier. Predictions have been made for some possible decays.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 11:19:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bhattacharya",
"Madhubrata",
""
],
[
"Gangopadhyay",
"G.",
""
]
] | [
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802.0949 | Felix Schwab | Christoph Promberger, Sebastian Schatt, Felix Schwab and Selma Uhlig | Bounding the Minimal 331 Model through the Decay B -> X_s gamma | 15 pages, 5 figures | Phys.Rev.D77:115022,2008 | 10.1103/PhysRevD.77.115022 | TUM-HEP-675/07, UAB-FT/637 | hep-ph | null | We study the decay B -> X_s gamma within the framework of the minimal 331
model, taking into account both new experimental and theoretical developments
that allow us to update and improve on an existing ten year old analysis. In
contrast to several other flavor changing observables that are modified already
at tree level from a new Z' gauge boson, we have only one loop contributions in
this case. Nevertheless, these are interesting, as they may be enhanced and can
shed light on the charged gauge boson and Higgs sector of the model.
Numerically, we find that the Higgs sector, which is well approximated by a 2
Higgs doublet model (2HDM), dominates, since the gauge contributions are
already very strongly constrained. With respect to B -> X_s gamma, the signal
of the minimal 331 model is therefore nearly identical to the 2HDM one, which
allows us to obtain a lower bound on the charged Higgs mass. Further, we
observe, in analogy to the 2HDM model, that the branching fraction can be
rather strongly increased for small values of tan beta. Also, we find that B ->
X_s gamma has no impact on the bounds obtained on rare K and B decays in an
earlier analysis.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 11:28:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Promberger",
"Christoph",
""
],
[
"Schatt",
"Sebastian",
""
],
[
"Schwab",
"Felix",
""
],
[
"Uhlig",
"Selma",
""
]
] | [
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] |
802.095 | Vladimir Krouglov | Vladimir Krouglov | The curvature of contact structure on 3-manifolds | 9 pages | Algebr. Geom. Topol. 8 (2008) 1567-1579 | 10.2140/agt.2008.8.1567 | null | math.DG math.GT | null | We study the sectional curvature of plane distributions on 3-manifolds. We
show that if the distribution is a contact structure it is easy to manipulate
this curvature. As a corollary we obtain that for every transversally oriented
contact structure on a closed 3-dimensional manifold $M$ there is a metric,
such that the sectional curvature of the contact distribution is equal to -1.
We also introduce the notion of Gaussian curvature of the plane distribution.
For this notion of curvature we get the similar results.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 11:42:12 GMT"
}
] | 2014-10-01T00:00:00 | [
[
"Krouglov",
"Vladimir",
""
]
] | [
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] |
802.0951 | Taichi Kobayashi | Taichi Kobayashi, Kohei Onda and Akira Tomimatsu | Disk illumination by black hole superradiance of electromagnetic
perturbations | 11 pages, 4 figures, corrected typos, published in Physical Review D | Phys.Rev.D77:064011,2008 | 10.1103/PhysRevD.77.064011 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Kerr-Schild formalism to solve the Einstein-Maxwell equations, we
study energy transport due to time-dependent electromagnetic perturbations
around a Kerr black hole, which may work as a mechanism to illuminate a disk
located on the equatorial plane. For such a disk-hole system it is found that
the energy extraction from the hole can occur under the well-known
superradiance condition for wave frequency, even though the energy absorption
into the hole should be rather dominant near the polar region of the horizon.
We estimate the efficiency of the superradiant amplification of the disk
illumination. Further we calculate the time-averaged energy density
distribution to show explicitly the existence of a negative energy region near
the horizon and to discuss the possible generation of a hot spot on the disk.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 11:28:40 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 02:45:54 GMT"
}
] | 2010-09-14T00:00:00 | [
[
"Kobayashi",
"Taichi",
""
],
[
"Onda",
"Kohei",
""
],
[
"Tomimatsu",
"Akira",
""
]
] | [
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] |
802.0952 | Petter Andreas Bergh | Petter Andreas Bergh, Srikanth B. Iyengar, Henning Krause, Steffen
Oppermann | Dimensions of triangulated categories via Koszul objects | Final revised version, to appear in Math. Z | null | null | null | math.CT math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lower bounds for the dimension of a triangulated category are provided. These
bounds are applied to stable derived categories of Artin algebras and of
commutative complete intersection local rings. As a consequence, one obtains
bounds for the representation dimensions of certain Artin algebras.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 11:40:39 GMT"
},
{
"version": "v2",
"created": "Sat, 14 Jun 2008 14:29:50 GMT"
},
{
"version": "v3",
"created": "Wed, 15 Apr 2009 19:25:59 GMT"
}
] | 2009-04-15T00:00:00 | [
[
"Bergh",
"Petter Andreas",
""
],
[
"Iyengar",
"Srikanth B.",
""
],
[
"Krause",
"Henning",
""
],
[
"Oppermann",
"Steffen",
""
]
] | [
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802.0953 | Hasan Akin | Hasan Akin | The Topological Directional Entropy of Z^2-actions Generated by Linear
Cellular Automata | 9 pages. submitted | Journal of Computational and Applied Mathematics, 225 (2) (2009),
459-466 | 10.1016/j.cam.2008.08.012 | null | math.DS math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the topological and metric directional entropy of
$\mathbb{Z}^2$-actions by generated additive cellular automata (CA hereafter),
defined by a local rule $f[l, r]$, $l, r\in \mathbb{Z}$, $l\leq r$, i.e. the
maps $T_{f[l, r]}: \mathbb{Z}^\mathbb{Z}_{m} \to \mathbb{Z}^\mathbb{Z}_{m}$
which are given by $T_{f[l, r]}(x) =(y_n)_ {-\infty}^{\infty}$, $y_{n} =
f(x_{n+l}, ..., x_{n+r}) = \sum_{i=l}^r\lambda_{i}x_{i+n}(mod m)$, $x=(x_n)_
{n=-\infty}^{\infty}\in \mathbb{Z}^\mathbb{Z}_{m}$, and $f:
\mathbb{Z}_{m}^{r-l+1}\to \mathbb{Z}_{m}$, over the ring $\mathbb{Z}_m (m \geq
2)$, and the shift map acting on compact metric space
$\mathbb{Z}^\mathbb{Z}_{m}$, where $m$ $(m \geq2)$ is a positive integer. Our
main aim is to give an algorithm for computing the topological directional
entropy of the $\mathbb{Z}^2$-actions generated by the additive CA and the
shift map. Thus, we ask to give a closed formula for the topological
directional entropy of $\mathbb{Z}^2$-action generated by the pair $(T_{f[l,
r]}, \sigma)$ in the direction $\theta$ that can be efficiently and rightly
computed by means of the coefficients of the local rule f as similar to [Theor.
Comput. Sci. 290 (2003) 1629-1646]. We generalize the results obtained by Ak\i
n [The topological entropy of invertible cellular automata, J. Comput. Appl.
Math. 213 (2) (2008) 501-508] to the topological entropy of any invertible
linear CA.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 11:42:41 GMT"
}
] | 2015-05-11T00:00:00 | [
[
"Akin",
"Hasan",
""
]
] | [
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] |
802.0954 | David Barnes | David Barnes | Rational Equivariant Spectra | null | null | null | null | math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop model categories of rational equivariant spectra whose homotopy
categories are equivalent to the category of rational equivariant cohomology
theories. We prove that given an orthogonal decomposition of the unit in the
rational Burnside ring, the model category of rational equivariant spectra
decomposes into a product of localisations. We use this result to reprove the
classification of rational equivariant cohomology theories for finite groups
and to study such cohomology theories for the group O(2). We then concentrate
on a split piece of the O(2) case and relate it to rational SO(2) equivariant
spectra.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:01:11 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Barnes",
"David",
""
]
] | [
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] |
802.0955 | Milena Chermisi | Milena Chermisi and Sergio Conti | Multiwell rigidity in nonlinear elasticity | 23 pages, 3 figures | SIAM J. Math. Analysis 42 (2010), 1986--2012 | null | null | math.AP | null | We derive a quantitative rigidity estimate for a multiwell problem in
nonlinear elasticity. Precisely, we show that if a gradient field is L^1-close
to a set of the form SO(n)U_1 \cup ... \cup SO(n)U_l, and an appropriate bound
on the length of the interfaces holds, then the gradient field is actually
close to only one of the wells SO(n)U_i. The estimate holds for any connected
subdomain, and has the optimal scaling.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:41:05 GMT"
}
] | 2016-11-14T00:00:00 | [
[
"Chermisi",
"Milena",
""
],
[
"Conti",
"Sergio",
""
]
] | [
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] |
802.0956 | Grigory Vereshkov | Yury Novoseltsev, Rita Novoseltseva, Grigory Vereshkov (INR RAS,
Moscow) | Multiplicity of photohadronization and photon--hadron scaling violation | 5 pages, 3 figures; v2: reference corrected | J.Phys.G36:025009,2009 | 10.1088/0954-3899/36/2/025009 | null | hep-ph | null | The method of scaling transformations permitting to carry out the
reconstruction of cross sections of $\gamma N$ and $\gamma\gamma$ interactions
on the basis of cross sections of nucleon-(anti)nucleon interactions is
suggested. The photon--hadron scaling violation is a consequence of dependence
of scaling transformation parameter $\bar n(s)$ on the energy. The universal
function $\bar n(s)$ is interpreted as the multiplicity of photohadronization.
This function is established by processing the data on $\gamma p$ cross
sections in the low energy region $\sqrt{s}< 20 \GeV$ and is extrapolated to
the high energy region up to $\sqrt{s}\sim 200 \GeV$. The results of the
reconstruction of $\gamma N$ cross sections at high energies and of
$\gamma\gamma$ ones at all energies are in a remarkable agreement with
available experimental data.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:08:36 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 11:28:00 GMT"
}
] | 2009-02-16T00:00:00 | [
[
"Novoseltsev",
"Yury",
"",
"INR RAS,\n Moscow"
],
[
"Novoseltseva",
"Rita",
"",
"INR RAS,\n Moscow"
],
[
"Vereshkov",
"Grigory",
"",
"INR RAS,\n Moscow"
]
] | [
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] |
802.0957 | Christina C. Th\"one | Christina C. Thoene, Johan P. U. Fynbo, Lise Christensen, Klaas
Wiersema, Joshua S. Bloom | Unraveling the dynamics and kinematics of GRB hosts with high resolution
spectroscopy | 4 pages, 4 figures; to be published in the proceedings of ''Gamma Ray
Bursts 2007'', Santa Fe, New Mexico, November 5-9; new version: minor
language issue fixed | AIP Conf.Proc.1000:492-495,2008 | 10.1063/1.2943516 | null | astro-ph | null | In the last years the research on GRB host galaxies has proceeded to more
detailed studies both using high resolution afterglow spectroscopy and
spatially resolved spectra of nearby hosts. High resolution spectra give a
detailed picture of the kinematic properties of matter along the line-of-sight
in the host. Two afterglow spectra show clear indications for outflows from
their host, namely GRB 030329 and GRB 060206, derived from the position of
absorption and host emission lines, nonvariability of Mg I and the radiation
field calculated from fine-structure line detections. In nearby GRB hosts it is
possible to resolve the actual GRB site. GRB 060505, a SN-less GRB, originated
in a relatively metal poor, star forming region with similar properties as
other long-duration hosts. A similar conclusion is reached for the site of GRB
980425/SN 1998bw.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:42:52 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 20:06:15 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Thoene",
"Christina C.",
""
],
[
"Fynbo",
"Johan P. U.",
""
],
[
"Christensen",
"Lise",
""
],
[
"Wiersema",
"Klaas",
""
],
[
"Bloom",
"Joshua S.",
""
]
] | [
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] |
802.0958 | A. V. Syromyatnikov | A. V. Syromyatnikov | Spin-wave interaction in two-dimensional ferromagnets with dipolar
forces | null | Phys. Rev. B 77, 144433 (2008) | 10.1103/PhysRevB.77.144433 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the spin-wave interaction in two-dimensional (2D) Heisenberg
ferromagnet (FM) with dipolar forces at $T_C\gg T\ge0$ using 1/S expansion. A
comprehensive analysis is carried out of the first 1/S corrections to the
spin-wave spectrum. In particular, similar to 3D FM discussed in our previous
paper A.V. Syromyatnikov, PRB {\bf 74}, 014435 (2006), we obtain that the
spin-wave interaction leads to the {\it gap} in the spectrum $\epsilon_{\bf k}$
renormalizing greatly the bare gapless spectrum at small momenta $k$.
Expressions for the spin-wave damping $\Gamma_{\bf k}$ are derived
self-consistently and it is concluded that magnons are well-defined
quasi-particles in both quantum and classical 2D FMs at small $T$. We observe
thermal enhancement of both $\Gamma_{\bf k}$ and $\Gamma_{\bf k}/\epsilon_{\bf
k}$ at small momenta. In particular, a peak appears in $\Gamma_{\bf k}$ and
$\Gamma_{\bf k}/\epsilon_{\bf k}$ at small $k$ and at any given direction of
$\bf k$. If $S\sim1$ the height of the peak in $\Gamma_{\bf k}/\epsilon_{\bf
k}$ is not larger than a value proportional to $T/D\ll1$, where $D$ is the
spin-wave stiffness. In the case of large spins $S\gg1$ the peak in
$\Gamma_{\bf k}/\epsilon_{\bf k}$ cannot be greater than that of the classical
2D FM found at $k=0$ which height is small only {\it numerically}: $\Gamma_{\bf
0}/\epsilon_{\bf 0}\approx0.16$ for the simple square lattice. Frustrating
next-nearest-neighbor exchange coupling increases $\Gamma_{\bf 0}/\epsilon_{\bf
0}$ in classical 2D FM only slightly. We find expressions for spin Green's
functions and the magnetization. The latter differs from the well-known result
by S.V. Maleev, Sov. Phys. JETP {\bf 43}, 1240 (1976). The effect of the
exchange anisotropy is also discussed briefly.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:22:23 GMT"
}
] | 2008-05-05T00:00:00 | [
[
"Syromyatnikov",
"A. V.",
""
]
] | [
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] |
802.0959 | Alice Garbagnati | Alice Garbagnati, Flavia Repetto | A geometrical approach to Gordan--Noether's and Franchetta's
contributions to a question posed by Hesse | 12 pages | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hesse claimed that an irreducible projective hypersurface in $\PP^n$ defined
by an equation with vanishing hessian determinant is necessarily a cone. Gordan
and Noether proved that this is true for $n\leq 3$ and constructed
counterexamples for every $n\geq 4$. Gordan and Noether and Franchetta gave
classification of hypersurfaces in $\PP^4$ with vanishing hessian and which are
not cones. Here we translate in geometric terms Gordan and Noether approach,
providing direct geometrical proofs of these results.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:28:36 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Garbagnati",
"Alice",
""
],
[
"Repetto",
"Flavia",
""
]
] | [
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] |
802.096 | Francesco Malaspina | Edoardo Ballico and Francesco Malaspina | Regularity and Cohomological Splitting Conditions for Vector Bundles on
Multiprojective Spaces | 13 pages, no figures | null | null | null | math.AG math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we give a definition of regularity on multiprojective spaces which is
different from the definitions of Hoffmann-Wang and Costa-Mir\'o Roig. By using
this notion we prove some splitting criteria for vector bundles.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:30:56 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 10:34:29 GMT"
},
{
"version": "v3",
"created": "Thu, 25 Aug 2011 10:09:41 GMT"
}
] | 2011-08-26T00:00:00 | [
[
"Ballico",
"Edoardo",
""
],
[
"Malaspina",
"Francesco",
""
]
] | [
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802.0961 | Takayuki R. Saitoh | Takayuki R.Saitoh (NAOJ), Hiroshi Daisaka (Hitotsubashi), Eiichiro
Kokubo (NAOJ), Junichiro Makino (NAOJ), Takashi Okamoto (Durham), Kohji
Tomisaka (NAOJ), Keiichi Wada (NAOJ), Naoki Yoshida (Nagoya) (Project
Milkyway) | Toward first-principle simulations of galaxy formation: I. How should we
choose star formation criteria in high-resolution simulations of disk
galaxies? | 15 pages, 14 figures, accepted for publication in PASJ. Abridged
abstract. For high resolution figures, see
http://www.cfca.nao.ac.jp/~saitoh/Papers/2008/Saitoh+2008a.pdf | null | 10.1093/pasj/60.4.667 | null | astro-ph | null | We performed 3-dimensional N-body/SPH simulations to study how mass
resolution and other model parameters such as the star formation efficiency
parameter, C* and the threshold density, nth affect structures of the galactic
gaseous/stellar disk in a static galactic potential. We employ 10^6 - 10^7
particles to resolve a cold and dense (T < 100 K & n_H > 100 cm^{-3}) phase. We
found that structures of the ISM and the distribution of young stars are
sensitive to the assumed nth. High-nth models with nth = 100 cm^{-3} yield
clumpy multi-phase features in the ISM. Young stars are distributed in a thin
disk of which half-mass scale height is 10 - 30 pc. In low-nth models with nth
= 0.1 cm^{-3}, the stellar disk is found to be several times thicker, and the
gas disk appears smoother than the high-nth models. A high-resolution
simulation with high-nth is necessary to reproduce the complex structure of the
gas disk. The global properties of the model galaxies in low-nth models, such
as star formation histories, are similar to those in the high-nth models when
we tune the value of C* so that they reproduce the observed relation between
surface gas density and surface star formation rate density. We however
emphasize that high-nth models automatically reproduce the relation, regardless
of the values of C*. The ISM structure, phase distribution, and distributions
of young star forming region are quite similar between two runs with values of
C* which differ by a factor of 15. We also found that the timescale of the flow
from n_H ~1 cm^{-3} to n_H > 100 cm^{-3} is about 5 times as long as the local
dynamical time and is independent of the value of C*. The use of a high-nth
criterion for star formation in high-resolution simulations makes numerical
models fairy insensitive to the modelling of star formation. (Abridged)
| [
{
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"created": "Thu, 7 Feb 2008 12:37:54 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 01:56:26 GMT"
},
{
"version": "v3",
"created": "Sun, 24 Feb 2008 09:05:07 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Saitoh",
"Takayuki R.",
"",
"NAOJ"
],
[
"Daisaka",
"Hiroshi",
"",
"Hitotsubashi"
],
[
"Kokubo",
"Eiichiro",
"",
"NAOJ"
],
[
"Makino",
"Junichiro",
"",
"NAOJ"
],
[
"Okamoto",
"Takashi",
"",
"Durham"
],
[
"Tomisaka",
"Kohji",
"",
"NAOJ"
],
[
"Wada",
"Keiichi",
"",
"NAOJ"
],
[
"Yoshida",
"Naoki",
"",
"Nagoya"
]
] | [
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0.0618513376,
-0.0338144712,
-0.0523079708,
-0.0658234432,
0.05411347,
-0.037915539,
0.0304098111,
0.0274694227,
-0.0093886098,
-0.0351557024,
-0.0312609747,
-0.0069898716,
-0.0412170291,
0.0223495346,
-0.0535460263,
-0.0578792319,
-0.1002311483,
-0.0520758331,
-0.0157336593
] |
802.0962 | Hrishikesh Ganu | Hrishikesh V. Ganu, B.N. Raghunandan (Atomization and Sprays Lab,
Aerospace Engineering, Indian Institute of Science, Bangalore) | Morphological Analysis of Cryogenic Spray Images | null | null | null | AE/A&S/01 | physics.flu-dyn physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study gives the development of a new technique for analyzing images of
Cryogenic sprays, to estimate the drop-size distribution. It has a sound
mathematical basis, in the form of Mathematical Morphology, and we have tried
to build up a formulation for a granulometry, starting from the elementary
operations of Dilation and Erosion. An axiomatic foundation for granulometry
has also been discussed. We have taken an actual LN2 spray photograph for
analysis, to illustrate the use of Morphological operations, culminating in a
granulometry.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:46:58 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Ganu",
"Hrishikesh V.",
"",
"Atomization and Sprays Lab,\n Aerospace Engineering, Indian Institute of Science, Bangalore"
],
[
"Raghunandan",
"B. N.",
"",
"Atomization and Sprays Lab,\n Aerospace Engineering, Indian Institute of Science, Bangalore"
]
] | [
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] |
802.0963 | Jan H. Bruinier | Jan H. Bruinier, Ken Ono and Robert C. Rhoades | Differential operators for harmonic weak Maass forms and the vanishing
of Hecke eigenvalues | formerly "Differential operators and harmonic weak Maass forms";
Theorem 1.4 corrected | null | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For integers $k\geq 2$, we study two differential operators on harmonic weak
Maass forms of weight $2-k$. The operator $\xi_{2-k}$ (resp. $D^{k-1}$) defines
a map to the space of weight $k$ cusp forms (resp. weakly holomorphic modular
forms). We leverage these operators to study coefficients of harmonic weak
Maass forms. Although generic harmonic weak Maass forms are expected to have
transcendental coefficients, we show that those forms which are "dual" under
$\xi_{2-k}$ to newforms with vanishing Hecke eigenvalues (such as CM forms)
have algebraic coefficients. Using regularized inner products, we also
characterize the image of $D^{k-1}$.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:51:25 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Apr 2008 14:28:10 GMT"
},
{
"version": "v3",
"created": "Mon, 26 Jan 2009 09:20:21 GMT"
}
] | 2009-01-26T00:00:00 | [
[
"Bruinier",
"Jan H.",
""
],
[
"Ono",
"Ken",
""
],
[
"Rhoades",
"Robert C.",
""
]
] | [
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] |
802.0964 | Tim Hesterberg | Tim Hesterberg, Nam Hee Choi, Lukas Meier, Chris Fraley | Least angle and $\ell_1$ penalized regression: A review | Published in at http://dx.doi.org/10.1214/08-SS035 the Statistics
Surveys (http://www.i-journals.org/ss/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Statistics Surveys 2008, Vol. 2, 61-93 | 10.1214/08-SS035 | IMS-SS-SS_2008_35 | stat.ME stat.ML | null | Least Angle Regression is a promising technique for variable selection
applications, offering a nice alternative to stepwise regression. It provides
an explanation for the similar behavior of LASSO ($\ell_1$-penalized
regression) and forward stagewise regression, and provides a fast
implementation of both. The idea has caught on rapidly, and sparked a great
deal of research interest. In this paper, we give an overview of Least Angle
Regression and the current state of related research.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:53:59 GMT"
},
{
"version": "v2",
"created": "Wed, 21 May 2008 06:40:12 GMT"
}
] | 2008-05-21T00:00:00 | [
[
"Hesterberg",
"Tim",
""
],
[
"Choi",
"Nam Hee",
""
],
[
"Meier",
"Lukas",
""
],
[
"Fraley",
"Chris",
""
]
] | [
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] |
802.0965 | Lev Fil'kov | L.V. Fil'kov and V.L. Kashevarov | Dipole and quadrupole polarizabilities of the pion | 3 pages, contribution to proceedings of "NSTAR 2007", 5-8 September,
Bonn, Germany; typos corrected | null | null | null | nucl-th hep-ex hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Data on pion polarizabilities obtained in different experiments are reviewed.
The values of the dipole and quadrupole polarizabilities of the pi^0 and
pi^{+-} mesons found are compared with predictions of dispersion sum rules
(DSRs) and two-loop calculations in the framework of chiral perturbation theory
(ChPT). Possible reasons of a difference between the predictions of DSRs and
ChPT are discussed.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 12:55:39 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 12:51:30 GMT"
}
] | 2008-02-18T00:00:00 | [
[
"Fil'kov",
"L. V.",
""
],
[
"Kashevarov",
"V. L.",
""
]
] | [
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] |
802.0966 | Marc Arnaudon | Marc Arnaudon (LMA), Anton Thalmaier, Stefanie Ulsamer | Existence of non-trivial harmonic functions on Cartan-Hadamard manifolds
of unbounded curvature | null | null | null | null | math.PR | null | The Liouville property of a complete Riemannian manifold (i.e., the question
whether there exist non-trivial bounded harmonic functions) attracted a lot of
attention. For Cartan-Hadamard manifolds the role of lower curvature bounds is
still an open problem. We discuss examples of Cartan-Hadamard manifolds of
unbounded curvature where the limiting angle of Brownian motion degenerates to
a single point on the sphere at infinity, but where nevertheless the space of
bounded harmonic functions is as rich as in the non-degenerate case. To see the
full boundary the point at infinity has to be blown up in a non-trivial way.
Such examples indicate that the situation concerning the famous conjecture of
Greene and Wu about existence of non-trivial bounded harmonic functions on
Cartan-Hadamard manifolds is much more complicated than one might have
expected.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:04:07 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Arnaudon",
"Marc",
"",
"LMA"
],
[
"Thalmaier",
"Anton",
""
],
[
"Ulsamer",
"Stefanie",
""
]
] | [
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802.0967 | Sushil Srivastava | S. K. Srivastava | Acceleration and Deceleration in Curvature Induced Phantom Model of the
Late and Future Universe, Cosmic Collapse as Well as its Quantum Escape | 33 pages | Int.J.Mod.Phys.D18:865-887,2009 | 10.1142/S0218271809014819 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here, cosmology of the late and future universe is obtained from
$f(R)$-gravity with non-linear curvature terms $R^2$ and $R^3$ ($R$ being the
Ricci scalar curvature). It is different from $f(R)$-dark enrgy models, where
non-linear curvature terms are taken as gravitational alternative of dark
energy. In the present model, neither linear nor no-linear curvature terms are
taken as dark energy. Rather, dark energy terms are induced by curvature terms
in the Friedmann equation derived from $f(R)$-gravitational equations. It has
advantage over $f(R)$- dark energy models in the sense that the present model
satisfies WMAP results and expands as $\sim t^{2/3}$ during matter-dominance.
So, it does not have problems due to which $f(R)$-dark energy models are
criticized. Curvature-induced dark energy, obtained here, mimics phantom.
Different phases of this model, including acceleration and deceleration during
phantom phase, are investigated here.It is found that expansion of the universe
will stop at the age $(3.87 t_0 + 694.4 {\rm kyr})$ ($t_0$ being the present
age of the universe) and after this epoch, it will contract and collapse by the
time $(336.87 t_0 + 694.4 {\rm kyr})$. Further,it is shown that universe will
escape predicted collapse (obtained using classical mechanics) on making
quantum gravity corrections relevant near collapse time due to extremely high
energy density and large curvature analogous to the state of very early
universe. Interestingly, cosmological constant is also induced here, which is
very small in classical domain, but very high in quantum domain.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:15:37 GMT"
}
] | 2009-09-17T00:00:00 | [
[
"Srivastava",
"S. K.",
""
]
] | [
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] |
802.0968 | Richard D. Ball | Guido Altarelli, Richard D Ball and Stefano Forte | Structure Function Resummation in small-x QCD | 6 pages, 3 figures: proceedings contribution for 8th International
Symposium on Radiative Corrections (RADCOR), Florence, October 2007 | PoSRADCOR2007:028,2007 | null | CERN-PH-TH/2008-024, Edinburgh 2008/08 | hep-ph | null | We summarize our recent results on small x resummation in full QCD with n_f
quark flavours and discuss their phenomenological impact in the extraction of
parton distributions from present day structure function data and their
extrapolation to the kinematics relevant for future colliders such as the LHC.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:07:29 GMT"
}
] | 2009-04-14T00:00:00 | [
[
"Altarelli",
"Guido",
""
],
[
"Ball",
"Richard D",
""
],
[
"Forte",
"Stefano",
""
]
] | [
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] |
802.0969 | Yohan Payan | Nicolas Vuillerme (TIMC), Nicolas Pinsault (TIMC), Olivier Chenu
(TIMC), Jacques Demongeot (TIMC), Yohan Payan (TIMC), Yuri Danilov (TCNL) | Sensory supplementation system based on electrotactile tongue
biofeedback of head position for balance control | null | Neuroscience Letters 431, 3 (2008) 206-10 | 10.1016/j.neulet.2007.11.049 | null | physics.med-ph | null | The present study aimed at investigating the effects of an artificial head
position-based tongue-placed electrotactile biofeedback on postural control
during quiet standing under different somatosensory conditions from the support
surface. Eight young healthy adults were asked to stand as immobile as possible
with their eyes closed on two Firm and Foam support surface conditions executed
in two conditions of No-biofeedback and Biofeedback. In the Foam condition, a
6-cm thick foam support surface was placed under the subjects' feet to alter
the quality and/or quantity of somatosensory information at the plantar sole
and the ankle. The underlying principle of the biofeedback consisted of
providing supplementary information about the head orientation with respect to
gravitational vertical through electrical stimulation of the tongue. Centre of
foot pressure (CoP) displacements were recorded using a force platform. Larger
CoP displacements were observed in the Foam than Firm conditions in the two
conditions of No-biofeedback and Biofeedback. Interestingly, this destabilizing
effect was less accentuated in the Biofeedback than No-biofeedback condition.
In accordance with the sensory re-weighting hypothesis for balance control, the
present findings evidence that the availability of the central nervous system
to integrate an artificial head orientation information delivered through
electrical stimulation of the tongue to limit the postural perturbation induced
by alteration of somatosensory input from the support surface.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:16:59 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Vuillerme",
"Nicolas",
"",
"TIMC"
],
[
"Pinsault",
"Nicolas",
"",
"TIMC"
],
[
"Chenu",
"Olivier",
"",
"TIMC"
],
[
"Demongeot",
"Jacques",
"",
"TIMC"
],
[
"Payan",
"Yohan",
"",
"TIMC"
],
[
"Danilov",
"Yuri",
"",
"TCNL"
]
] | [
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] |
802.097 | Peter Kopietz | Peyman Pirooznia, Florian Schuetz, and Peter Kopietz | Dynamic structure factor of Luttinger liquids with quadratic energy
dispersion and long-range interactions | 33 Revtex pages, 17 figures | Phys. Rev. B 78, 075111 (2008) | 10.1103/PhysRevB.78.075111 | null | cond-mat.str-el cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the dynamic structure factor S (omega, q) of spinless fermions
in one dimension with quadratic energy dispersion k^2/2m and long range
density-density interaction whose Fourier transform f_q is dominated by small
momentum-transfers q << q_0 << k_F. Here q_0 is a momentum-transfer cutoff and
k_F is the Fermi momentum. Using functional bosonization and the known
properties of symmetrized closed fermion loops, we obtain an expansion of the
inverse irreducible polarization to second order in the small parameter q_0 /
k_F. In contrast to perturbation theory based on conventional bosonization, our
functional bosonization approach is not plagued by mass-shell singularities.
For interactions which can be expanded as f_q = f_0 + f_0^{2} q^2/2 + O (q^4)
with finite f_0^{2} we show that the momentum scale q_c = 1/ | m f_0^{2} |
separates two regimes characterized by a different q-dependence of the width
gamma_q of the collective zero sound mode and other features of S (omega, q).
For q_c << q << k_F we find that the line-shape in this regime is
non-Lorentzian with an overall width gamma_q of order q^3/(m q_c) and a
threshold singularity at the lower edge.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:20:39 GMT"
}
] | 2008-08-15T00:00:00 | [
[
"Pirooznia",
"Peyman",
""
],
[
"Schuetz",
"Florian",
""
],
[
"Kopietz",
"Peter",
""
]
] | [
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] |
802.0971 | G\"oran F\"aldt | G\"oran F\"aldt and Ulla Tengblad | Pion Compton scattering and bremsstrahlung | 20 pages, 11 figures | Phys.Rev.C78:014606,2008 | 10.1103/PhysRevC.78.014606 | null | nucl-th | null | The pion-polarizability functions are structure functions of pion-Compton
scattering. They can be assessed in high-energy pion-nucleus bremsstrahlung
reactions, $\pi^- +A\to\pi^- +\gamma +A$. We present numerical expectations for
pion-nucleus bremsstrahlung cross sections in the Coulomb region, i.e. the
small-angle region where the nuclear scattering is dominated by the Coulomb
interaction. We investigate the prospects of measuring the polarizability
functions for pion-Compton c.m. energies from threshold up to 1 GeV. A
meson-exchange model is used for the pion-Compton amplitude.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:22:19 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 09:49:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fäldt",
"Göran",
""
],
[
"Tengblad",
"Ulla",
""
]
] | [
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] |
802.0972 | Anna Gori | Lucio Bedulli, Anna Gori | Actions of vanishing homogeneity rank on quaternionic-Kaehler projective
spaces | 18 pages. The present version corrects and improves the previous
version of the paper entitled "3-coisotropic actions on positive
quaternionic-Kaehler manifolds". A key example has been added | null | null | null | math.DG | null | We classify isometric actions of compact Lie groups on quaternionic-K\"ahler
projective spaces with vanishing homogeneity rank. We also show that they are
not in general quaternion-coisotropic.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:23:47 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 17:41:33 GMT"
},
{
"version": "v3",
"created": "Thu, 22 May 2008 15:14:11 GMT"
}
] | 2008-05-22T00:00:00 | [
[
"Bedulli",
"Lucio",
""
],
[
"Gori",
"Anna",
""
]
] | [
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] |
802.0973 | Harold Steinacker | Harald Grosse, Harold Steinacker, Michael Wohlgenannt | Emergent Gravity, Matrix Models and UV/IR Mixing | 33 pages, 3 figures. V2: references added | JHEP0804:023,2008 | 10.1088/1126-6708/2008/04/023 | UWTHPh-2008-01 | hep-th gr-qc | null | We verify explicitly that UV/IR mixing for noncommutative gauge theory can be
understood in terms of an induced gravity action, as predicted by the
identification [1] of gravity within matrix models of NC gauge theory. More
precisely, we obtain the Einstein-Hilbert action by integrating out a scalar
field in the adjoint. It arises from the well-known UV/IR mixing of NC gauge
theory, which is carefully re-analyzed and interpreted in terms of gravity. The
matrix model therefore contains gravity as an IR effect, due to UV/IR mixing.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:54:30 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 10:32:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grosse",
"Harald",
""
],
[
"Steinacker",
"Harold",
""
],
[
"Wohlgenannt",
"Michael",
""
]
] | [
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802.0974 | Bent Orsted | Bent Orsted and Birgit Speh | Branching Laws for Some Unitary Representations of SL(4,R) | This is a contribution to the Proceedings of the 2007 Midwest
Geometry Conference in honor of Thomas P. Branson, published in SIGMA
(Symmetry, Integrability and Geometry: Methods and Applications) at
http://www.emis.de/journals/SIGMA/ | SIGMA 4 (2008), 017, 19 pages | 10.3842/SIGMA.2008.017 | null | math.RT | http://creativecommons.org/licenses/by-nc-sa/3.0/ | In this paper we consider the restriction of a unitary irreducible
representation of type $A_{\mathfrak q}(\lambda)$ of $GL(4,{\mathbb R})$ to
reductive subgroups $H$ which are the fixpoint sets of an involution. We obtain
a formula for the restriction to the symplectic group and to $GL(2,{\mathbb
C})$, and as an application we construct in the last section some
representations in the cuspidal spectrum of the symplectic and the complex
general linear group. In addition to working directly with the cohmologically
induced module to obtain the branching law, we also introduce the useful
concept of pseudo dual pairs of subgroups in a reductive Lie group.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:38:21 GMT"
}
] | 2008-04-25T00:00:00 | [
[
"Orsted",
"Bent",
""
],
[
"Speh",
"Birgit",
""
]
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802.0975 | Sof\'ia A. Cora | S. A. Cora, L. Tornatore, P. Tozzi, K. Dolag | On the Dynamical Origin of the ICM Metallicity Evolution | 11 pages, 6 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13068.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study on the origin of the metallicity evolution of the
intra-cluster medium (ICM) by applying a semi-analytic model of galaxy
formation to N-body/SPH (smoothed particle hydrodynamic) non-radiative
numerical simulations of clusters of galaxies. The semi-analytic model includes
gas cooling, star formation, supernovae feedback and metal enrichment, and is
linked to the diffuse gas of the underlying simulations so that the chemical
properties of gas particles are dynamically and consistently generated from
stars in the galaxies. This hybrid model let us have information on the spatial
distribution of metals in the ICM. The results obtained for a set of clusters
with virial masses of ~1.5*10^15 h^{-1} M_sun contribute to the theoretical
interpretation of recent observational X-ray data, which indicate a decrease of
the average iron content of the intra-cluster gas with increasing redshift. We
find that this evolution arises mainly as a result of a progressive increase of
the iron abundance within ~0.15 R_vir. The clusters have been considerably
enriched by z~1 with very low contribution from recent star formation. Low
entropy gas that has been enriched at high redshift sinks to the cluster centre
contributing to the evolution of the metallicity profiles.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:41:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cora",
"S. A.",
""
],
[
"Tornatore",
"L.",
""
],
[
"Tozzi",
"P.",
""
],
[
"Dolag",
"K.",
""
]
] | [
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] |
802.0976 | Alexander Altland | Piet W. Brouwer, Alexander Altland | Anderson localization from classical trajectories | 15 pages, 9 figures | null | 10.1103/PhysRevB.78.075304 | null | cond-mat.mes-hall nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Anderson localization in quasi-one dimensional conductors with
ballistic electron dynamics, such as an array of ballistic chaotic cavities
connected via ballistic contacts, can be understood in terms of classical
electron trajectories only. At large length scales, an exponential
proliferation of trajectories of nearly identical classical action generates an
abundance of interference terms, which eventually leads to a suppression of
transport coefficients. We quantitatively describe this mechanism in two
different ways: the explicit description of transition probabilities in terms
of interfering trajectories, and an hierarchical integration over fluctuations
in the classical phase space of the array cavities.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:42:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brouwer",
"Piet W.",
""
],
[
"Altland",
"Alexander",
""
]
] | [
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802.0977 | Alexander Lenz | Alexander Lenz | Mixing and lifetimes of $b$-hadrons | 12 pages, invited talk at the XI Mexican Workshop on Particles and
Fields, Tuxtla, Mexico, 7th - 12 th Nov. 2007 | AIP Conf.Proc.1026:36-47,2008 | 10.1063/1.2965074 | null | hep-ph | null | We review the status of mixing and lifetimes of $b$-hadrons. We will show
that $\Delta \Gamma / \Delta M$, $a_{sl}$ and $\phi$ are better suited to
search for new physics effects than $\Delta M$ alone, because of our poor
knowledge of the decay constants. The theoretical precision in the
determination of $\Gamma_{12} / M_{12}$ - which contains all information on
$\Delta \Gamma / \Delta M$, $a_{sl}$ and $\phi$ - can be tested directly by
investigating the lifetimes of $b$-hadrons, because both quantities rely on the
same theoretical footing. In particular we will also present a numerical
estimate for the lifetime of the $\Xi_b$-baryon.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:12:35 GMT"
}
] | 2009-05-29T00:00:00 | [
[
"Lenz",
"Alexander",
""
]
] | [
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802.0978 | Andreas H\"oring | Andreas H\"oring | Minimal classes on the intermediate Jacobian of a generic cubic
threefold | 14 pages, changed metadata | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let X be a smooth cubic threefold. We can associate two objects to X: the
intermediate Jacobian J and the Fano surface F parametrising lines on X. By a
theorem of Clemens and Griffiths, the Fano surface can be embedded in the
intermediate Jacobian and the cohomology class of its image is minimal. In this
paper we show that if X is generic, the Fano surface is the only surface of
minimal class in J.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:20:07 GMT"
},
{
"version": "v2",
"created": "Sat, 6 Jan 2018 09:25:14 GMT"
}
] | 2018-01-09T00:00:00 | [
[
"Höring",
"Andreas",
""
]
] | [
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0.0022487238,
-0.000369039,
0.0409828722,
-0.0097306734,
0.0122323213,
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-0.0275181234,
0.0245136935,
0.1220411584,
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] |
802.0979 | Andreas Enge | Juliana Belding, Reinier Br\"oker, Andreas Enge (INRIA Futurs),
Kristin Lauter | Computing Hilbert Class Polynomials | null | Dans ANTS-VIII - Eighth Algorithmic Number Theory Symposium (2008) | null | null | math.NT | null | We present and analyze two algorithms for computing the Hilbert class
polynomial $H_D$ . The first is a p-adic lifting algorithm for inert primes p
in the order of discriminant D < 0. The second is an improved Chinese remainder
algorithm which uses the class group action on CM-curves over finite fields.
Our run time analysis gives tighter bounds for the complexity of all known
algorithms for computing $H_D$, and we show that all methods have comparable
run times.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 13:55:47 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Belding",
"Juliana",
"",
"INRIA Futurs"
],
[
"Bröker",
"Reinier",
"",
"INRIA Futurs"
],
[
"Enge",
"Andreas",
"",
"INRIA Futurs"
],
[
"Lauter",
"Kristin",
""
]
] | [
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] |
802.098 | Almasy Andrea | A. A. Almasy, K. Schilcher, H. Spiesberger | Determination of QCD condensates from tau-decay data | 22 pages | Eur.Phys.J.C55:237-248,2008 | 10.1140/epjc/s10052-008-0579-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have used the latest data from the ALEPH Collaboration to extract values
for QCD condensates up to dimension d=12 in the V-A channel and up to dimension
d=8 in the V, A and V+A channels. Performing 2- and 3-parameter fits, we obtain
new results for the correlations of condensates. The results are consistent
among themselves and agree with most of the previous results found in the
literature.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:01:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Almasy",
"A. A.",
""
],
[
"Schilcher",
"K.",
""
],
[
"Spiesberger",
"H.",
""
]
] | [
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802.0981 | T.Hatice Yalvac | T. Hatice Yalvac | A Unified Theory on Some Basic Topological Concepts | null | null | null | null | math.GN | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several mathematicians, including myself, have studied some unifications in
general topological spaces as well as in fuzzy topological spaces. For instance
in our earlier works, using operations on topological spaces, we have tried to
unify some concepts similar to continuity, openness, closedness of functions,
compactness, filter convergence, closedness of graphs, countable compactness
and Lindelof property. In this article, to obtain further unifications, we will
study $\phi_{1,2}$-compactness and relations between $\phi_{1,2}$-compactness,
filters and $\phi_{1,2}$% -closure operator.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:03:40 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Yalvac",
"T. Hatice",
""
]
] | [
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] |
802.0982 | Fabricio Macedo de Souza | F. M. Souza, A. P. Jauho, and J. C. Egues | Spin-polarized current and shot noise in the presence of spin flip in a
quantum dot via nonequilibrium Green's functions | Published version. 13 pages, 7 figures | Phys. Rev. B 78, 155303 (2008) | 10.1103/PhysRevB.78.155303 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using non-equilibrium Green functions we calculate the spin-polarized current
and shot noise in a ferromagnet--quantum-dot--ferromagnet (FM-QD-FM) system.
Both parallel (P) and antiparallel (AP) magnetic configurations are considered.
Coulomb interaction and coherent spin-flip (similar to a transverse magnetic
field) are taken into account within the dot. We find that the interplay
between Coulomb interaction and spin accumulation in the dot can result in a
bias-dependent current polarization $\wp$. In particular, $\wp$ can be
suppressed in the P alignment and enhanced in the AP case depending on the bias
voltage. The coherent spin-flip can also result in a switch of the current
polarization from the emitter to the collector lead. Interestingly, for a
particular set of parameters it is possible to have a polarized current in the
collector and an unpolarized current in the emitter lead. We also found a
suppression of the Fano factor to values well below 0.5.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:07:21 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Oct 2008 10:49:18 GMT"
}
] | 2008-10-31T00:00:00 | [
[
"Souza",
"F. M.",
""
],
[
"Jauho",
"A. P.",
""
],
[
"Egues",
"J. C.",
""
]
] | [
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802.0983 | Chiara Caprini | Marian Douspis, Patricia G. Castro, Chiara Caprini, Nabila Aghanim | Optimising large galaxy surveys for ISW detection | 7 pages, 9 figures, 2 tables | null | 10.1051/0004-6361:200809499 | null | astro-ph | null | We report on investigations of the power of next generation cosmic microwave
background and large scale structure surveys in constraining the nature of dark
energy through the cross-correlation of the Integrated Sachs Wolfe effect and
the galaxy distribution. First we employ a signal to noise analysis to find the
most appropriate properties of a survey in order to detect the correlated
signal at a level of more than 4 sigma: such a survey should cover more than
35% of the sky, the galaxy distribution should be probed with a median redshift
higher than 0.8, and the number of galaxies detected should be higher than a
few per squared arcmin. We consider the forthcoming surveys DUNE, LSST, SNAP,
PanSTARRS. We then compute the constraints that the DUNE survey can put on the
nature of dark energy (through different parametrizations of its equation of
state) with a standard Fisher matrix analysis. We confirm that, with respect to
pure CMB constraints, cross-correlation constraints help in breaking
degeneracies among the dark energy and the cosmological parameters. Naturally,
the constraining capability is not independent of the choice of the dark energy
model. Despite being weaker than some other probes (like Gravitational
Weak-Lensing), these constraints are complementary to them, being sensitive to
the high-redshift behaviour of the dark energy.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:20:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Douspis",
"Marian",
""
],
[
"Castro",
"Patricia G.",
""
],
[
"Caprini",
"Chiara",
""
],
[
"Aghanim",
"Nabila",
""
]
] | [
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] |
802.0984 | Zurab Silagadze | Z.K. Silagadze | Moving Mini-Max - a new indicator for technical analysis | 10 pages, 3 figures. Published version | IFTA Journal 11 (2011), 46-49 | null | null | q-fin.ST physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new indicator for technical analysis. The indicator emphasizes
maximums and minimums in price series with inherent smoothing and has a
potential to be useful in both mechanical trading rules and chart pattern
analysis.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:07:56 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Feb 2011 19:42:11 GMT"
}
] | 2011-02-24T00:00:00 | [
[
"Silagadze",
"Z. K.",
""
]
] | [
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] |
802.0985 | Reinhard Schumacher | Reinhard Schumacher | Polarization in Hyperon Photo- and Electro- Production | Invited paper at NStar2007, Accepted for EPJ A 1-21-08, 6 pages, 6
figures | Eur.Phys.J.A35:299-305,2008 | 10.1140/epja/i2007-10558-3 | null | nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multiple polarization observables must be measured to access the amplitude
structure of pseudoscalar meson photoproduction off the proton. The
hyperon-producing reactions are especially attractive to study, since the weak
decays allow straightforward measurement of the induced and recoil polarization
observables. In this paper we emphasize $\gamma + p \to K^+ + \Lambda$,
discussing recent measurements of $C_x$, $C_z$, and $P$ for this reaction. An
empirical constraint on the helicity amplitudes is obtained. A simplified model
involving spin-flip and spin non-flip amplitudes is presented. Finally, a
semi-classical model of how the polarization may arise is presented.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:10:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Schumacher",
"Reinhard",
""
]
] | [
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802.0986 | Achilles Tertikas | Stathis Filippas, Achilles Tertikas and Jesper Tidblom | On the structure of Hardy-Sobolev-Maz'ya inequalities | 20 pages | null | null | null | math.AP math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we establish new improvements of the optimal Hardy inequality
in the half space. We first add all possible linear combinations of Hardy type
terms thus revealing the structure of this type of inequalities and obtaining
best constants. We then add the critical Sobolev term and obtain necessary and
sufficient conditions for the validity of Hardy-Sobolev-Maz'ya type
inequalities.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 16:08:20 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Filippas",
"Stathis",
""
],
[
"Tertikas",
"Achilles",
""
],
[
"Tidblom",
"Jesper",
""
]
] | [
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] |
802.0987 | Beno\^it Darqui\'e | E. A. Hinds, M. Trupke, B. Darqui\'e, J. Goldwin, G. Dutier | Progress in atom chips and the integration of optical microcavities | 12 pages, 6 figures, proceedings of the ICOLS07 conference | null | 10.1142/9789812813206_0023 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent progress at the Centre for Cold Matter in developing atom
chips. An important advantage of miniaturizing atom traps on a chip is the
possibility of obtaining very tight trapping structures with the capability of
manipulating atoms on the micron length scale. We recall some of the pros and
cons of bringing atoms close to the chip surface, as is required in order to
make small static structures, and we discuss the relative merits of metallic,
dielectric and superconducting chip surfaces. We point out that the addition of
integrated optical devices on the chip can enhance its capability through
single atom detection and controlled photon production. Finally, we review the
status of integrated microcavities that have recently been demonstrated at our
Centre and discuss their prospects for future development.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:30:10 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Hinds",
"E. A.",
""
],
[
"Trupke",
"M.",
""
],
[
"Darquié",
"B.",
""
],
[
"Goldwin",
"J.",
""
],
[
"Dutier",
"G.",
""
]
] | [
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] |
802.0988 | Nicola Masetti | N. Masetti, E. Mason, L. Morelli, S.A. Cellone, V.A. McBride, E.
Palazzi, L. Bassani, A. Bazzano, A.J. Bird, P.A. Charles, A.J. Dean, G.
Galaz, N. Gehrels, R. Landi, A. Malizia, D. Minniti, F. Panessa, G.E. Romero,
J.B. Stephen, P. Ubertini and R. Walter | Unveiling the nature of INTEGRAL objects through optical spectroscopy.
VI. A multi-observatory identification campaign | 20 pages, 14 figures, 7 tables. Accepted for publication on Astronomy
& Astrophysics, main journal. Figures 1-5 are in .jpg format to fit the arXiv
uploads size limits | null | 10.1051/0004-6361:20079332 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using 8 telescopes in the northern and southern hemispheres, plus archival
data from two on-line sky surveys, we performed a systematic optical
spectroscopic study of 39 putative counterparts of unidentified or poorly
studied INTEGRAL sources in order to determine or at least better assess their
nature. This was implemented within the framework of our campaign to reveal the
nature of newly-discovered and/or unidentified sources detected by INTEGRAL.
Our results show that 29 of these objects are active galactic nuclei (13 of
which are of Seyfert 1 type, 15 are Seyfert 2 galaxies and one is possibly a BL
Lac object) with redshifts between 0.011 and 0.316, 7 are X-ray binaries (5
with high-mass companions and 2 with low-mass secondaries), one is a magnetic
cataclysmic variable, one is a symbiotic star and one is possibly an active
star. Thus, the large majority (74%) of the identifications in this sample
belongs to the AGN class. When possible, the main physical parameters for these
hard X-ray sources were also computed using the multiwavelength information
available in the literature. These identifications further underscore the
importance of INTEGRAL in studying the hard X-ray spectra of all classes of
X-ray emitting objects, and the effectiveness of a strategy of multi-catalogue
cross-correlation plus optical spectroscopy to securely pinpoint the actual
nature of still unidentified hard X-ray sources.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:31:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Masetti",
"N.",
""
],
[
"Mason",
"E.",
""
],
[
"Morelli",
"L.",
""
],
[
"Cellone",
"S. A.",
""
],
[
"McBride",
"V. A.",
""
],
[
"Palazzi",
"E.",
""
],
[
"Bassani",
"L.",
""
],
[
"Bazzano",
"A.",
""
],
[
"Bird",
"A. J.",
""
],
[
"Charles",
"P. A.",
""
],
[
"Dean",
"A. J.",
""
],
[
"Galaz",
"G.",
""
],
[
"Gehrels",
"N.",
""
],
[
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"R.",
""
],
[
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"A.",
""
],
[
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"D.",
""
],
[
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"F.",
""
],
[
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"G. E.",
""
],
[
"Stephen",
"J. B.",
""
],
[
"Ubertini",
"P.",
""
],
[
"Walter",
"R.",
""
]
] | [
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] |
802.0989 | Martin Kotulla | M. Kotulla, D. Trnka, P. M\"uhlich, G. Anton, J. C. S. Bacelar, O.
Bartholomy, D. Bayadilov, Y. A. Beloglazov, R. Bogend\"orfer, R. Castelijns,
V. Crede, H. Dutz, A. Ehmanns, D. Elsner, R. Ewald, I. Fabry, M. Fuchs, K.
Essig, Ch. Funke, R. Gothe, R. Gregor, A. B. Gridnev, E. Gutz, S. H\"offgen,
P. Hoffmeister, I. Horn, J. H\"ossl, I. Jaegle, J. Junkersfeld, H.
Kalinowsky, Frank Klein, Fritz Klein, E. Klempt, M. Konrad, B. Kopf, B.
Krusche, J. Langheinrich, H. L\"ohner, I.V. Lopatin, J. Lotz, S. Lugert, D.
Menze, J. G. Messchendorp, T. Mertens, V. Metag, U. Mosel, M. Nanova, R.
Novotny, M. Ostrick, L. M. Pant, H. van Pee, M. Pfeiffer, A. Roy, A. Radkov,
S. Schadmand, Ch. Schmidt, H. Schmieden, B. Schoch, S. Shende, G. Suft, V. V.
Sumachev, T. Szczepanek, A. S\"ule, U. Thoma, R. Varma, D. Walther, Ch.
Weinheimer, Ch. Wendel | Modification of the $\omega$-Meson Lifetime in Nuclear Matter | 5 pages, 4 figures | Phys.Rev.Lett.100:192302,2008 | 10.1103/PhysRevLett.100.192302 | null | nucl-ex hep-ph nucl-th | null | The photo production of $\omega$ mesons on the nuclei C, Ca, Nb and Pb has
been measured using the Crystal Barrel/TAPS detector at the ELSA tagged photon
facility in Bonn. The dependence of the $\omega$ meson cross section on the
nuclear mass number has been compared with three different types of models, a
Glauber analysis, a BUU analysis of the Giessen theory group and a calculation
by the Valencia theory group. In all three cases, the inelastic $\omega$ width
is found to be $130-150 \rm{MeV/c^2}$ at normal nuclear matter density for an
average 3-momentum of 1.1 GeV/c. In the restframe of the $\omega$ meson, this
inelastic $\omega$ width corresponds to a reduction of the $\omega$ lifetime by
a factor $\approx 30$. For the first time, the momentum dependent $\omega$N
cross section has been extracted from the experiment and is in the range of 70
mb.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:50:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kotulla",
"M.",
""
],
[
"Trnka",
"D.",
""
],
[
"Mühlich",
"P.",
""
],
[
"Anton",
"G.",
""
],
[
"Bacelar",
"J. C. S.",
""
],
[
"Bartholomy",
"O.",
""
],
[
"Bayadilov",
"D.",
""
],
[
"Beloglazov",
"Y. A.",
""
],
[
"Bogendörfer",
"R.",
""
],
[
"Castelijns",
"R.",
""
],
[
"Crede",
"V.",
""
],
[
"Dutz",
"H.",
""
],
[
"Ehmanns",
"A.",
""
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[
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[
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"R.",
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[
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"I.",
""
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[
"Fuchs",
"M.",
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[
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"K.",
""
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[
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"Ch.",
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[
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[
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"R.",
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[
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"A. B.",
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[
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"E.",
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[
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"S.",
""
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[
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"P.",
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"I.",
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"J.",
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"I.",
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"J.",
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"L. M.",
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[
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[
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""
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[
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"Ch.",
""
]
] | [
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] |
802.099 | Charles R. Cowley | C. R. Cowley, S. Hubrig, and G. M. Wahlgren | Re II and Other Exotic Spectra in HD 65949 | ASOS9 Poster (Lund, Sweden, August 2007), to be published in Journal
of Physics: Conference Series (JPCS), 6 pages 1 figure | J.Phys.Conf.Ser.130:012005,2008 | 10.1088/1742-6596/130/1/012005 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Powerful astronomical spectra reveal an urgent need for additional work on
atomic lines, levels, and oscillator strengths. The star HD 65949 provides some
excellent examples of species rarely identified in stellar spectra. For
example, the Re II spectrum is well developed, with 17 lines between 3731 and
4904 [A], attributed wholly or partially to Re II. Classifications and
oscillator strengths are lacking for a number of these lines. The spectrum of
Os II is well identified. Of 14 lines attributed wholly or partially to Os II,
only one has an entry in the VALD database. We find strong evidence that Te II
is present. There are NO Te II lines in the VALD database. Ru II is clearly
present, but oscillator strengths for lines in the visual are lacking. There is
excellent to marginal evidence for a number of less commonly identified
species, including Kr II, Nb II, Sb II, Xe II, Pr III, Ho III, Au II, and Pt II
(probably Pt-198), to be present in the spectrum of HD 65949. The line Hg II at
3984 [A] is of outstanding strength, and all three lines of Multiplet 1 of Hg I
are present, even though the surface temperature of HD 65949 is relatively
high. Finally, we present the case of an unidentified, 24 [mA], line at 3859.63
[A], which could be the same feature seen in magnetic CP stars. It is typically
blended with a putative U II line used in cosmochronology.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:37:34 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Cowley",
"C. R.",
""
],
[
"Hubrig",
"S.",
""
],
[
"Wahlgren",
"G. M.",
""
]
] | [
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] |
802.0991 | Holger Fehske | G. Wellein, H. Fehske, A. Alvermann, and D. M. Edwards | Correlation-induced metal insulator transition in a two-channel
fermion-boson model | 4 pages, 4 figures, 1 table, revised version accepted for publication
in Phys. Rev. Lett | Phys. Rev. Lett. 101, 116402 (2008) | 10.1103/PhysRevLett.101.136402 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate charge transport within some background medium by means of an
effective lattice model with a novel form of fermion-boson coupling. The bosons
describe fluctuations of a correlated background. By analyzing groundstate and
spectral properties of this transport model, we show how a metal-insulator
quantum phase transition can occur for the half-filled band case. We discuss
the evolution of a mass-asymmetric band structure in the insulating phase and
establish connections to the Mott and Peierls transition scenarios.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:45:19 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Aug 2008 09:44:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wellein",
"G.",
""
],
[
"Fehske",
"H.",
""
],
[
"Alvermann",
"A.",
""
],
[
"Edwards",
"D. M.",
""
]
] | [
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] |
802.0992 | Roberto Giambo' | R. Giamb\'o, F. Giannoni, G. Magli | Genericity of blackhole formation in the gravitational collapse of
homogeneous self-interacting scalar fields | 18 pages, 4 figures | J.Math.Phys.49:042504,2008 | 10.1063/1.2907949 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational collapse of a wide class of self-interacting homogeneous
scalar fields models is analyzed. The class is characterized by certain general
conditions on the scalar field potential, which, in particular, include both
asymptotically polynomial and exponential behaviors. Within this class, we show
that the generic evolution is always divergent in a finite time, and then make
use of this result to construct radiating star models of the Vaidya type. It
turns out that blackholes are generically formed in such models.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 14:46:34 GMT"
}
] | 2010-03-24T00:00:00 | [
[
"Giambó",
"R.",
""
],
[
"Giannoni",
"F.",
""
],
[
"Magli",
"G.",
""
]
] | [
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] |
802.0993 | Francois-Xavier Dupe | Fran\c{c}ois-Xavier Dup\'e (GREYC), Jalal Fadili (GREYC), Jean Luc
Starck (CEA SACLAY) | Image Deconvolution Under Poisson Noise Using Sparse Representations and
Proximal Thresholding Iteration | null | Dans IEEE ICASSP - International Conference on Acoustics, Speech,
and Signal Processing, Las Vegas : \'Etats-Unis d'Am\'erique (2008) | null | null | math.OC math.ST stat.TH | null | We propose an image deconvolution algorithm when the data is contaminated by
Poisson noise. The image to restore is assumed to be sparsely represented in a
dictionary of waveforms such as the wavelet or curvelet transform. Our key
innovations are: First, we handle the Poisson noise properly by using the
Anscombe variance stabilizing transform leading to a non-linear degradation
equation with additive Gaussian noise. Second, the deconvolution problem is
formulated as the minimization of a convex functional with a data-fidelity term
reflecting the noise properties, and a non-smooth sparsity-promoting penalties
over the image representation coefficients (e.g. l1-norm). Third, a fast
iterative backward-forward splitting algorithm is proposed to solve the
minimization problem. We derive existence and uniqueness conditions of the
solution, and establish convergence of the iterative algorithm. Experimental
results are carried out to show the striking benefits gained from taking into
account the Poisson statistics of the noise. These results also suggest that
using sparse-domain regularization may be tractable in many deconvolution
applications, e.g. astronomy or microscopy.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:00:58 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Mar 2008 12:36:09 GMT"
}
] | 2008-03-25T00:00:00 | [
[
"Dupé",
"François-Xavier",
"",
"GREYC"
],
[
"Fadili",
"Jalal",
"",
"GREYC"
],
[
"Starck",
"Jean Luc",
"",
"CEA SACLAY"
]
] | [
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] |
802.0994 | Oliver Jenkinson | Oscar F. Bandtlow, Oliver Jenkinson | Explicit a priori bounds on transfer operator eigenvalues | null | Comm. Math. Phys. 276 (2007), 901-905 | 10.1007/s00220-007-0355-7 | null | math.DS math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide explicit bounds on the eigenvalues of transfer operators defined
in terms of holomorphic data.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:01:12 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Bandtlow",
"Oscar F.",
""
],
[
"Jenkinson",
"Oliver",
""
]
] | [
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] |
802.0995 | Ian Hambleton | Ian Hambleton, Matthias Kreck, and Peter Teichner | Topological 4-manifolds with geometrically 2-dimensional fundamental
groups | 27 pages. Minor corrections and writing improvements in this revision
following a referee's report | J. Topol. Anal. 1 (2009), no. 2, 123--151 | null | null | math.GT math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Closed oriented 4-manifolds with the same geometrically 2-dimensional
fundamental group (satisfying certain properties) are classified up to
$s$-cobordism by their $w_2$-type, equivariant intersection form and the
Kirby-Siebenmann invariant. As an application, we obtain a complete
homeomorphism classification of closed oriented 4-manifolds with solvable
Baumslag-Solitar fundamental groups, including a precise realization result.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:13:56 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Mar 2009 10:44:40 GMT"
}
] | 2013-02-12T00:00:00 | [
[
"Hambleton",
"Ian",
""
],
[
"Kreck",
"Matthias",
""
],
[
"Teichner",
"Peter",
""
]
] | [
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802.0996 | Paul Goerss | Paul G. Goerss | Quasi-coherent sheaves on the moduli stack of formal groups | null | null | null | null | math.AT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The central aim of this monograph is to provide decomposition results for
quasi-coherent sheaves on the moduli stack of one-dimensional formal groups.
These results will be based on the geometry of the stack itself, particularly
the height filtration and an analysis of the formal neighborhoods of the
geometric points. The main theorems are algebraic chromatic convergence results
and fracture square decompositions. There is a major technical hurdle in this
story, as the moduli stack of formal groups does not have the finitness
properties required of an algebraic stack as usually defined. This is not a
conceptual problem, but in order to be clear on this point and to write down a
self-contained narrative, I have included a great deal of discussion of the
geometry of the stack itself, giving various equivalent descriptions.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:03:45 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Goerss",
"Paul G.",
""
]
] | [
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802.0997 | Michael A. Soloviev | Michael A. Soloviev (Lebedev Physical Institute) | Failure of microcausality in noncommutative field theories | LaTeX, 22 pages; v2: minor updates to agree with published version,
added reference | Phys.Rev.D77:125013,2008 | 10.1103/PhysRevD.77.125013 | FIAN-TD/2008-01 | hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the question of microcausality violations in quantum field theory
on noncommutative spacetime, taking $O(x)=:\phi\star\phi:(x)$ as a sample
observable. Using methods of the theory of distributions, we precisely describe
the support properties of the commutator [O(x),O(y)] and prove that, in the
case of space-space noncommutativity, it does not vanish at spacelike
separation in the noncommuting directions. However, the matrix elements of this
commutator exhibit a rapid falloff along an arbitrary spacelike direction
irrespective of the type of noncommutativity. We also consider the star
commutator for this observable and show that it fails to vanish even at
spacelike separation in the commuting directions and completely violates
causality. We conclude with a brief discussion about the modified Wightman
functions which are vacuum expectation values of the star products of fields at
different spacetime points.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:04:11 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jun 2008 05:59:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Soloviev",
"Michael A.",
"",
"Lebedev Physical Institute"
]
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0.0007630009,
-0.0159292445,
-0.0662022009,
0.0114875622,
-0.055150874,
0.0385474488,
0.0036187805,
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] |
802.0998 | Joanna Brown | J.M Brown, G.A. Blake, C. Qi, C.P. Dullemond, D.J. Wilner | LkH$\alpha$ 330: Evidence for dust clearing through resolved
submillimeter imaging | 11 pages, 3 figures, accepted to ApJL | Astrophys.J.704:496-502,2009 | 10.1088/0004-637X/704/1/496 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mid-infrared spectrophotometric observations have revealed a small sub-class
of circumstellar disks with spectral energy distributions (SEDs) suggestive of
large inner gaps with low dust content. However, such data provide only an
indirect and model dependent method of finding central holes. We present here
the direct characterization of a 40 AU radius inner gap in the disk around LkHa
330 through 340 GHz (880 micron) dust continuum imaging with the Submillimeter
Array (SMA). This large gap is fully resolved by the SMA observations and
mostly empty of dust with less than 1.3 x 10^-6 M_solar of solid particles
inside of 40 AU. Gas (as traced by accretion markers and CO M-band emission) is
still present in the inner disk and the outer edge of the gap rises steeply --
features in better agreement with the underlying cause being gravitational
perturbation than a more gradual process such as grain growth. Importantly, the
good agreement of the spatially resolved data and spectrophometry-based model
lends confidence to current interpretations of SEDs with significant dust
emission deficits as arising from disks with inner gaps or holes. Further
SED-based searches can therefore be expected to yield numerous additional
candidates that can be examined at high spatial resolution.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:04:14 GMT"
}
] | 2009-10-02T00:00:00 | [
[
"Brown",
"J. M",
""
],
[
"Blake",
"G. A.",
""
],
[
"Qi",
"C.",
""
],
[
"Dullemond",
"C. P.",
""
],
[
"Wilner",
"D. J.",
""
]
] | [
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802.0999 | Edward Witten | Edward Witten | Mirror Symmetry, Hitchin's Equations, And Langlands Duality | 15 pp | null | 10.1093/acprof:oso/9780199534920.003.0007 | null | math.RT math-ph math.MP | null | Geometric Langlands duality can be understood from statements of mirror
symmetry that can be formulated in purely topological terms for an oriented
two-manifold $C$. But understanding these statements is extremely difficult
without picking a complex structure on $C$ and using Hitchin's equations. We
sketch the essential statements both for the ``unramified'' case that $C$ is a
compact oriented two-manifold without boundary, and the ``ramified'' case that
one allows punctures. We also give a few indications of why a more precise
description requires a starting point in four-dimensional gauge theory.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 16:11:53 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Witten",
"Edward",
""
]
] | [
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] |
802.1 | Gabriella Pasztor | Gabriella Pasztor (for the CMS Collaboration) | Discovery potential for Higgs bosons beyond the SM | Prepared for International Europhysics Conference on High Energy
Physics (EPS-HEP2007), Manchester, England, 19-25 Jul 2007 | J.Phys.Conf.Ser.110:072032,2008 | 10.1088/1742-6596/110/7/072032 | CERN-CMS-CR-2007-058, CMS-CR-2007-058 | hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery potential of the CMS detector for the MSSM neutral and charged
Higgs bosons at the LHC is presented based on studies with full detector
simulation and event reconstruction of the principal discovery channels.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:09:46 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Pasztor",
"Gabriella",
"",
"for the CMS Collaboration"
]
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] |
802.1001 | Vicente Garzo | Vicente Garzo | A note on the violation of the Einstein relation in a driven moderately
dense granular gas | 6 figures | J. Stat. Mech. P05007 (2008) | 10.1088/1742-5468/2008/05/P05007 | null | cond-mat.stat-mech cond-mat.soft | null | The Einstein relation for a driven moderately dense granular gas in
$d$-dimensions is analyzed in the context of the Enskog kinetic equation. The
Enskog equation neglects velocity correlations but retains spatial correlations
arising from volume exclusion effects. As expected, there is a breakdown of the
Einstein relation $\epsilon=D/(T_0\mu)\neq 1$ relating diffusion $D$ and
mobility $\mu$, $T_0$ being the temperature of the impurity. The kinetic theory
results also show that the violation of the Einstein relation is only due to
the strong non-Maxwellian behavior of the reference state of the impurity
particles. The deviation of $\epsilon$ from unity becomes more significant as
the solid volume fraction and the inelasticity increase, especially when the
system is driven by the action of a Gaussian thermostat. This conclusion
qualitatively agrees with some recent simulations of dense gases [Puglisi {\em
et al.}, 2007 {\em J. Stat. Mech.} P08016], although the deviations observed in
computer simulations are more important than those obtained here from the
Enskog kinetic theory. Possible reasons for the quantitative discrepancies
between theory and simulations are discussed.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:38:54 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Apr 2008 17:02:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Garzo",
"Vicente",
""
]
] | [
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802.1002 | Xavier Bry | Xavier Bry (I3M) | New Estimation Procedures for PLS Path Modelling | null | null | null | null | cs.LG | null | Given R groups of numerical variables X1, ... XR, we assume that each group
is the result of one underlying latent variable, and that all latent variables
are bound together through a linear equation system. Moreover, we assume that
some explanatory latent variables may interact pairwise in one or more
equations. We basically consider PLS Path Modelling's algorithm to estimate
both latent variables and the model's coefficients. New "external" estimation
schemes are proposed that draw latent variables towards strong group structures
in a more flexible way. New "internal" estimation schemes are proposed to
enable PLSPM to make good use of variable group complementarity and to deal
with interactions. Application examples are given.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:18:27 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Bry",
"Xavier",
"",
"I3M"
]
] | [
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