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801.4673 | Nezri | E. Athanassoula, F.-S. Ling, E. Nezri, R. Teyssier | Gamma ray and Neutrino fluxes from a cosmological dark matter simulation | 15 pages, 8 figures | Astropart.Phys.31:37-45,2009 | 10.1016/j.astropartphys.2008.11.002 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we estimate the gamma-ray and neutrino fluxes coming from dark
matter annihilation in a Milky Way framework provided by a recent N-BODY
HORIZON simulation. We first study the characteristics of the simulation and
highlight the mass distribution within the galactic halo. The general dark
matter density has a typical $r^{-3}$ power law for large radii, but the inner
behaviour is poorly constrained below the resolution of the simulation ($\sim
200$ pc). We identify clumps and subclumps and analyze their distribution, as
well as their internal structure. Inside the clumps, the power law is rather
universal, $r^{-2.5}$ in the outer part with again strong uncertainties for
smaller radii, especially for light clumps. We show a full-sky map of the
astrophysical contribution to the gamma-ray or neutrino fluxes in this N-body
framework. Using quite model independent and general assumptions for the high
energy physics part, we evaluate the possible absolute fluxes and show some
benchmark regions for the experiments GLAST, EGRET, and a km3 size extension of
ANTARES like the KM3NeT project. While individual clumps seem to be beyond
detection reach, the galactic center region is promising and GLAST could be
sensitive to the geometry and the structure of its dark matter distribution.
The detection by a km3 version of ANTARES is, however, more challenging due to
a higher energy threshold. We also point out that the lack of resolution leaves
the inner structure of subhalos poorly constrained. Using the same clump
spectrum and mass fraction, a clump luminosity boost of order ten can be
achieved with a steeper profile in the inner part of the sub-halos.
| [
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"version": "v1",
"created": "Wed, 30 Jan 2008 14:32:23 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jul 2008 16:12:39 GMT"
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] | 2009-06-23T00:00:00 | [
[
"Athanassoula",
"E.",
""
],
[
"Ling",
"F. -S.",
""
],
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"E.",
""
],
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""
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801.4674 | Simona Gallerani | S. Gallerani, A. Ferrara, X. Fan, Choudhury T. Roy, R. Salvaterra | Was the Universe neutral beyond redshift six? | 6 pages, 3 figures; to appear in the Proceedings `A Century of
Cosmology', San Servolo (Venezia, Italy), August 2007, to be published in `Il
Nuovo Cimento'; typos corrected | Nuovo Cim.B122:977-983,2007 | 10.1393/ncb/i2008-10456-3 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide measurements of the neutral hydrogen fraction xHI at z~6, by
comparing semi-analytical models of the Lyalpha forest with observations of
high-z quasars and Gamma Ray Bursts absorption spectra. We analyze the
transmitted flux in a sample of 17 QSOs spectra at 5.74<zem<6.42 studying
separately the narrow transmission windows (peaks) and the wide dark portions
(gaps) in the observed absorption spectra. By comparing the statistics of these
spectral features with our models, we conclude that xHI evolves smoothly from
10^{-4.4} at z=5.3 to 10^{-4.2} at z=5.6, with a robust upper limit xHI<0.36 at
z=6.3. We show the results of the first-ever detected transverse proximity
effect in the HI Lyalpha forest, produced by the HII region of the faint quasar
RD J1148+5253 at z=5.70 intervening along the LOS of SDSS J1148+5251 at z=6.42.
Moreover, we propose a novel method to study cosmic reionization using
absorption line spectra of high-redshift GRBs afterglows. We show that the time
evolution and the statistics of gaps in the observed spectra represent
exquisite tools to discriminate among different reionization models. By
applying our methods to GRB 050904 detected at z=6.29, we show that the
observation of this burst provides strong indications of a highly ionized
intergalactic medium at z~6, with an estimated mean neutral hydrogen fraction
xHI=6.4\pm 0.3\times 10^{-5} along that line of sight.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:10:08 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Aug 2008 15:41:47 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Gallerani",
"S.",
""
],
[
"Ferrara",
"A.",
""
],
[
"Fan",
"X.",
""
],
[
"Roy",
"Choudhury T.",
""
],
[
"Salvaterra",
"R.",
""
]
] | [
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801.4675 | Alessandra De Rosa | A. De Rosa (INAF-IASF-Roma), L. Bassani (INAF/IASF-Bologna), P.
Ubertini (INAF-IASF-Roma), F. Panessa (INAF-IASF-Roma), A. Malizia
(INAF-IASF-Bologna), A. J. Dean (University of Southampton), R. Walter
(INTEGRAL SDC) | An X-ray view of absorbed INTEGRAL AGN | Accepted for publication in Astronomy and Astrophysics | null | 10.1051/0004-6361:20078319 | null | astro-ph | null | Aims. We present a 0.2--200 keV broad-band study of absorbed AGN observed
with INTEGRAL, XMM-Newton, Chandra and ASCA to investigate the continuum shape
and the absorbing/reflecting medium properties. Methods. The sources are
selected in the INTEGRAL AGN sample to have a 20--100 keV flux below
8$\times10^{-11}$ $\flux$ (5 mCrab), and are characterized by a 2--10 keV flux
in the range (0.8--10)$\times10^{-11}$ $\flux$. The good statistics allow us a
detailed study of the intrinsic and reflected continuum components. In
particular, the analysis performed on the combined broad-band spectra allow us
to investigate the presence of Compton reflection features and high energy
cut-off in these objects. Results. The column density of the absorbing gas
establishes the Compton thin nature for three sources in which a measure of the
absorption was still missing. The Compton thin nature of all the sources in
this small sample is also confirmed by the diagnostic ratios F$x/F[OIII]. The
Compton reflection components we measure, reflection continuum and iron line,
are not immediately compatible with a scenario in which the absorbing and
reflecting media are one and the same, i.e. the obscuring torus. A possible
solution is that the absorption is more effective than reflection, e.g. under
the hypothesis that the absorbing/reflecting medium is not uniform, like a
clumpy torus, or that the source is observed through a torus with a very
shallow opening angle. The high energy cut-off (a lower limit in two cases) is
found in all sources of our sample and the range of values is in good agreement
with that found in type 1 Seyfert galaxies. At lower energies there is clear
evidence of a soft component (reproduced with a thermal and/or scattering
model), in six objects.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 13:51:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"De Rosa",
"A.",
"",
"INAF-IASF-Roma"
],
[
"Bassani",
"L.",
"",
"INAF/IASF-Bologna"
],
[
"Ubertini",
"P.",
"",
"INAF-IASF-Roma"
],
[
"Panessa",
"F.",
"",
"INAF-IASF-Roma"
],
[
"Malizia",
"A.",
"",
"INAF-IASF-Bologna"
],
[
"Dean",
"A. J.",
"",
"University of Southampton"
],
[
"Walter",
"R.",
"",
"INTEGRAL SDC"
]
] | [
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801.4676 | Ko Sanders | Ko Sanders (University of York, UK) | On the Reeh-Schlieder Property in Curved Spacetime | 13 pages, 2 figures | Commun.Math.Phys.288:271-285,2009 | 10.1007/s00220-009-0734-3 | null | math-ph math.MP | null | We attempt to prove the existence of Reeh-Schlieder states on curved
spacetimes in the framework of locally covariant quantum field theory using the
idea of spacetime deformation and assuming the existence of a Reeh-Schlieder
state on a diffeomorphic (but not isometric) spacetime. We find that physically
interesting states with a weak form of the Reeh-Schlieder property always exist
and indicate their usefulness. Algebraic states satisfying the full
Reeh-Schlieder property also exist, but are not guaranteed to be of physical
interest.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:01:50 GMT"
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] | 2009-04-17T00:00:00 | [
[
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"Ko",
"",
"University of York, UK"
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] |
801.4677 | Benoit Claudon | Beno\^it Claudon (IECN) | Gamma-reduction for smooth orbifolds | 11 pages, no figure | Manuscripta Mathematica 127, 4 (2008) 521-532 | null | null | math.AG math.CV | null | The aim of this short note is to show how to construct a rationnal Remmert
reduction for the universal cover of a smooth K\"ahler orbifold. Doins this, we
are led to introduce some singular K\"ahler metrics adapted to the orbifold
structure.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:02:01 GMT"
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] | 2014-10-13T00:00:00 | [
[
"Claudon",
"Benoît",
"",
"IECN"
]
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] |
801.4678 | Antti Rasila | Vladimir M. Miklyukov, Antti Rasila, Matti Vuorinen | Stagnation zones for $\mathcal{A}$-harmonic functions on canonical
domains | null | Boundary Value Problems Volume 2009 (2009), Article ID 853607, 23
pages | 10.1155/2009/853607 | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study stagnation zones of $\mathcal{A}$-harmonic functions on canonical
domains in the Euclidean $n$-dimensional space. Phragmen-Lindel\"of type
theorems are proved.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:02:16 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Feb 2010 06:02:53 GMT"
}
] | 2010-02-24T00:00:00 | [
[
"Miklyukov",
"Vladimir M.",
""
],
[
"Rasila",
"Antti",
""
],
[
"Vuorinen",
"Matti",
""
]
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] |
801.4679 | Frank Haberl | F. Haberl, W. Pietsch | XMM-Newton observations of the Small Magellanic Cloud: X-ray outburst of
the 6.85 s pulsar XTE J0103-728 | 5 pages, 4 figures, submitted to A&A on 21 Dec. 2007 | null | 10.1051/0004-6361:20079308 | null | astro-ph | null | A bright X-ray transient was seen during an XMM-Newton observation in the
direction of the Small Magellanic Cloud (SMC) in October 2006. The EPIC data
allow us to accurately locate the source and to investigate its temporal and
spectral behaviour. X-ray spectra covering 0.2-10 keV and pulse profiles in
different energy bands were extracted from the EPIC data. The detection of 6.85
s pulsations in the EPIC-PN data unambiguously identifies the transient with
XTE J0103-728, discovered as 6.85 s pulsar by RXTE. The X-ray light curve
during the XMM-Newton observation shows flaring activity of the source with
intensity changes by a factor of two within 10 minutes. Modelling of
pulse-phase averaged spectra with a simple absorbed power-law indicates
systematic residuals which can be accounted for by a second emission component.
For models implying blackbody emission, thermal plasma emission or emission
from the accretion disk (disk-blackbody), the latter yields physically sensible
parameters. The photon index of the power-law of ~0.4 indicates a relatively
hard spectrum. The 0.2-10 keV luminosity was 2x10^{37} with a contribution of
~3% from the disk-blackbody component. A likely origin for the excess emission
is reprocessing of hard X-rays from the neutron star by optically thick
material near the inner edge of an accretion disk. From a timing analysis we
determine the pulse period to 6.85401(1) s indicating an average spin-down of
~0.0017 s per year since the discovery of XTE J0103-728 in May 2003. The X-ray
properties and the identification with a Be star confirm XTE J0103-728 as
Be/X-ray binary transient in the SMC.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:18:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Haberl",
"F.",
""
],
[
"Pietsch",
"W.",
""
]
] | [
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] |
801.468 | Angel Rivas Vargas | \'Angel Rivas and Alfredo Luis | Intrinsic metrological resolution as a distance measure and nonclassical
light | 8 pages, some remarks added | Phys. Rev. A 77, 063813 (2008) | 10.1103/PhysRevA.77.063813 | null | quant-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elaborate on a Hilbert-Schmidt distance measure assessing the intrinsic
metrological accuracy in the detection of signals imprinted on quantum probe
states by signal-dependent transformations. For small signals this leads to a
probe-transformation measure $\Lambda$ fully symmetric on the probe $\rho$ and
the generator $G$ of the transformation $\Lambda (\rho, G) = \Lambda (G,
\rho)$. Although $\Lambda$ can be regarded as a generalization of variance we
show that no uncertainty relation holds for the product of measures
corresponding to complementary generators. We show that all states with
resolution larger than coherent states are nonclassical. We apply this
formalism to feasible probes and transformations.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:10:42 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jun 2008 12:42:45 GMT"
}
] | 2009-04-28T00:00:00 | [
[
"Rivas",
"Ángel",
""
],
[
"Luis",
"Alfredo",
""
]
] | [
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] |
801.4681 | Jerzy Galica | H. Maeder, J. Galica, E. Mis-Kuzminska and S. Gierszal | Collision Cross Section of the J = 2 <- 1 Rotational Transition of
CF3CCH due to Higher Order Interactions | 9 pages, 7 figures, 2 tables | null | null | null | physics.chem-ph physics.atm-clus | null | The collision cross section of the rotational transition J = 2 <- 1 of
3,3,3-trifluoropropyne, CF3CCH, caused by rare gas perturbers has been
determined by investigating transient emission signals of molecular gas
samples. From analysis of the pressure dependence of the width of the
rotational line J = 2<-1 pressure broadening parameters have been derived for
the pure gas and for mixtures with the rare gases He, Ne, Ar, Kr and Xe. The
pressure shift parameter for the pure gas sigmas/p = 29.03(12) kHz/Pa also has
been obtained. Calculations based on the Anderson-Tsao-Curnutte theory using
induction and dispersion interactions for the description of collisions of
CF3CCH with He, Ne, Ar, Kr and Xe, respectively, are in qualitative agreement
with the experimental results.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:10:50 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Maeder",
"H.",
""
],
[
"Galica",
"J.",
""
],
[
"Mis-Kuzminska",
"E.",
""
],
[
"Gierszal",
"S.",
""
]
] | [
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] |
801.4682 | Igor M. Suslov | A. A. Pogorelov, I. M. Suslov (P.L.Kapitza Institute for Physical
Problems, Moscow, Russia) | Critical Exponents from Field Theory: New Evaluation | null | null | null | null | cond-mat.stat-mech hep-ph hep-th | null | We present new evaluation of the critical exponents of O(n)- symmetric \phi^4
theory from the field theoretical renormalization group, based on the new
algorithm for summing divergent series. The central values practically coincide
with those by Le Guillou and Zinn-Justin (1980) but their uncertainty is
essentially smaller.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:12:23 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Pogorelov",
"A. A.",
"",
"P.L.Kapitza Institute for Physical\n Problems, Moscow, Russia"
],
[
"Suslov",
"I. M.",
"",
"P.L.Kapitza Institute for Physical\n Problems, Moscow, Russia"
]
] | [
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] |
801.4683 | Lucia Capogna | L. Capogna, A. Martinelli, M.G. Francesconi, P.G. Radaelli, J.
Rodriguez Carvajal, O. Cabeza, M. Ferretti, C. Castellano, T. Corridoni, N.
Pompeo | Crystal and magnetic structure of (La0.70Ca0.30)(CryMn1-y)O3: a neutron
powder diffraction study | 7 pages, 5 figures, 2 tables | null | 10.1103/PhysRevB.77.104438 | null | cond-mat.str-el | null | The crystal and magnetic structure of (La0.70Ca0.30)(CryMn1-y)O3 for y =
0.70, 0.50 and 0.15 has been investigated using neutron powder diffraction. The
three samples crystallize in the Pnma space group at both 290 K and 5 K and
exhibit different magnetic structures at low temperature. In
(La0.70Ca0.30)(Cr0.70Mn0.30)O3, antiferromagnetic order with a propagation
vector k = 0 sets in. The magnetic structure is Gx, i.e. of the G-type with
spins parallel to the a-axis. On the basis of our Rietveld refinement and the
available magnetisation data, we speculate that only Cr3+ spins order, whereas
Mn4+ act as a random magnetic impurity. In (La0.70Ca0.30)(Cr0.50Mn0.50)O3 the
spin order is still of type Gx, although the net magnetic moment is smaller. No
evidence for magnetic order of the Mn ions is observed. Finally, in
(La0.70Ca0.30)(Cr0.15Mn0.85)O3 a ferromagnetic ordering of the Mn spins takes
place, whereas the Cr3+ ions act as random magnetic impurities with randomly
oriented spins.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:17:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Capogna",
"L.",
""
],
[
"Martinelli",
"A.",
""
],
[
"Francesconi",
"M. G.",
""
],
[
"Radaelli",
"P. G.",
""
],
[
"Carvajal",
"J. Rodriguez",
""
],
[
"Cabeza",
"O.",
""
],
[
"Ferretti",
"M.",
""
],
[
"Castellano",
"C.",
""
],
[
"Corridoni",
"T.",
""
],
[
"Pompeo",
"N.",
""
]
] | [
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] |
801.4684 | Luciano da Fontoura Costa | Luciano da Fontoura Costa | Communities in Neuronal Complex Networks Revealed by Activation Patterns | 11 pages, 7 figures. Comments and suggestions welcomed | null | null | null | q-bio.NC cond-mat.dis-nn physics.soc-ph | null | Recently, it has been shown that the communities in neuronal networks of the
integrate-and-fire type can be identified by considering patterns containing
the beginning times for each cell to receive the first non-zero activation. The
received activity was integrated in order to facilitate the spiking of each
neuron and to constrain the activation inside the communities, but no time
decay of such activation was considered. The present article shows that, by
taking into account exponential decays of the stored activation, it is possible
to identify the communities also in terms of the patterns of activation along
the initial steps of the transient dynamics. The potential of this method is
illustrated with respect to complex neuronal networks involving four
communities, each of a different type (Erd\H{o}s-R\'eny, Barab\'asi-Albert,
Watts-Strogatz as well as a simple geographical model). Though the
consideration of activation decay has been found to enhance the communities
separation, too intense decays tend to yield less discrimination.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:18:34 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Costa",
"Luciano da Fontoura",
""
]
] | [
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801.4685 | Filippo D'Ammando | F. D'Ammando, S. Bianchi, E. Jimenez-Bailon, G. Matt | XMM-Newton observations of 4 luminous radio-quiet AGN, and the soft
X-ray excess problem | 7 pages, 2 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20078685 | null | astro-ph | null | The nature and origin of the soft X-ray excess in radio quiet AGN is still an
open issue. The interpretation in terms of thermal disc emission has been
challanged by the discovery of the constancy of the effective temperature
despite the wide range of Black Hole masses of the observed sources.
Alternative models are reflection from ionized matter and absorption in a
relativistically smeared wind. We analyzed XMM-Newton observations of four
luminous radio quiet AGN with the aim of characterising their main properties
and in particular the soft excess. Different spectral models for the soft
excess were tried: thermal disc emission, Comptonization, ionized reflection,
relativistically smeared winds. Comptonization of thermal emission and the
smeared winds provide the best fits, but the other models also provide
acceptable fits. All models, however, return parameters very similar from
source to source, despite the large differences in luminosities, Black Hole
masses and Eddington ratios. Moreover, the smeared wind model require very
large smearing velocities. The UV to X-ray fluxes ratios are very different,
but do not correlate with any other parameter. No fully satisfactory
explanation for the soft X-ray excess is found. Better data, like e.g.
observations in a broader energy band, are needed to make further progresses.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:19:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"D'Ammando",
"F.",
""
],
[
"Bianchi",
"S.",
""
],
[
"Jimenez-Bailon",
"E.",
""
],
[
"Matt",
"G.",
""
]
] | [
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] |
801.4686 | Igor M. Suslov | I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow,
Russia) | Possibility of the 2D Anderson Transition and Generalized Lyapunov
Exponents | Latex, 10 pages, 1 figure included | null | null | null | cond-mat.dis-nn cond-mat.mes-hall | null | The possible existence of the Anderson transition in 2D systems without
interaction and spin-orbit effects (such as the usual Anderson model) becomes
recently a subject of controversy in the literature. Comparative analysis of
approaches based on generalized Lyapunov exponents is given, in order to
resolve controversy.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:29:35 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 16:48:13 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Suslov",
"I. M.",
"",
"P.L.Kapitza Institute for Physical Problems, Moscow,\n Russia"
]
] | [
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] |
801.4687 | Yoav Linzon | Y. Shavit, Y. Linzon, S. Bar-Ad, R. Morandotti, M. Volatier-Ravat, V.
Aimez, R. Ares | Power dependent switching of nonlinear trapping by local photonic
potentials | Submitted to Optics Letters | null | 10.1364/OL.33.001056 | null | nlin.AO nlin.PS | null | We study experimentally and numerically the nonlinear scattering of wave
packets by local multi-site guiding centers embedded in a continuous dielectric
medium, as a function of the input power and angle of incidence. The extent of
trapping into the linear modes of different sites is manipulated as a function
of both the input power and incidence angle, demonstrating power-controlled
switching of nonlinear trapping by local photonic potentials.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 11:21:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shavit",
"Y.",
""
],
[
"Linzon",
"Y.",
""
],
[
"Bar-Ad",
"S.",
""
],
[
"Morandotti",
"R.",
""
],
[
"Volatier-Ravat",
"M.",
""
],
[
"Aimez",
"V.",
""
],
[
"Ares",
"R.",
""
]
] | [
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] |
801.4688 | R. L. Collins | R. L. Collins | A PEP model of the electron | null | null | null | null | physics.gen-ph | null | One of the more profound mysteries of physics is how nature ties together EM
fields to form an electron. A way to do this is examined in this study. A bare
magnetic dipole containing a flux quantum spins stably, and produces an inverse
square E= -vxB electric field similar to what one finds from charge. Gauss' law
finds charge in this model, though there be none. For stability, a current loop
about the waist of the magnetic dipole is needed and we must go beyond the
classical Maxwell's equations to find it. A spinning E field is equivalent to
an electric displacement current. The sideways motion of the spinning E (of
constant magnitude) creates a little-recognized transverse electric
displacement current about the waist. This differs from Maxwell's electric
displacement current, in which E increases in magnitude. The sideways motion of
E supports the dipolar B field, B=vxE/c^2. Beyond the very core of the magnetic
dipole, each of these two velocities is essentially c and vxE/c^2 =
vx(-vxB)/c^2 = B, the spinning E field wholly sourcing the dipolar B field. The
anisotropy of the vxB field is cured by precession about an inclined axis.
Choosing a Bohr magneton for the magnetic dipole and assuming it spins at the
Compton frequency, Gauss' law finds Q = e. The vxB field, normally thought to
be solenoidal, becomes instead a conservative field in this model. Charge is
recognized as merely a mathematical construct, not fundamental but nevertheless
useful. With charge deleted, and with addition of the transverse electric
displacement current, Maxwell's equations can be written in terms of the E and
B fields alone.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:37:10 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Collins",
"R. L.",
""
]
] | [
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] |
801.4689 | Isabel Sainz | Isabel Sainz, Andrei B. Klimov and Luis Roa | Quantum phase transitions in an effective Hamiltonian: fast and slow
systems | null | J. Phys.A: Math. Theor. 41 (2008) 355301 | 10.1088/1751-8113/41/35/355301 | null | quant-ph | null | An effective Hamiltonian describing interaction between generic "fast" and a
"slow" systems is obtained in the strong interaction limit. The result is
applied for studying the effect of quantum phase transition as a bifurcation of
the ground state of the "slow subsystem" in the thermodynamic limit. Examples
as atom-field and atom-atom interactions are analyzed in detail.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:39:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sainz",
"Isabel",
""
],
[
"Klimov",
"Andrei B.",
""
],
[
"Roa",
"Luis",
""
]
] | [
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] |
801.469 | Marco Valerio Battisti | Marco Valerio Battisti, Giovanni Montani | Cosmological implications of an evolutionary quantum gravity | 4 pages; to appear in the proceedings of the II Stueckelberg
Workshop, Int.J.Mod.Phys.A, references added | Int.J.Mod.Phys.A23:1235-1239,2008 | 10.1142/S0217751X08040135 | null | gr-qc hep-th | null | The cosmological implications of an evolutionary quantum gravity are analyzed
in the context of a generic inhomogeneous model. The Schr\"{o}dinger problem is
formulated and solved in the presence of a scalar field, an ultrarelativistic
matter and a perfect gas regarded as the dust-clock. Considering the actual
phenomenology, it is shown how the evolutionary approach overlaps the
Wheeler-DeWitt one.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:53:10 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 09:02:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Battisti",
"Marco Valerio",
""
],
[
"Montani",
"Giovanni",
""
]
] | [
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] |
801.4691 | Emmanuele Cappelluti | E. Cappelluti, S. Ciuchi, and S. Fratini | Polaronic signatures in the optical properties of
Nd$_{2-x}$Ce$_x$CuO$_4$ | null | Phys. Rev. B 79, 012502 (2009) | null | null | cond-mat.str-el | null | We investigate the temperature and doping dependence of the optical
conductivity $\sigma(\omega)$ of Nd$_{2-x}$Ce$_x$CuO$_4$ in terms of
magnetic/lattice polaron formation. We employ dynamical mean-field theory in
the context of the Holstein-t-J model where an exact analytical solution is
available in the limit of infinite connectivity. We show that the pseudogap
features in the optical conductivity of this compound can be associated to the
formation of lattice polarons assisted by the magnetic interaction.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:55:04 GMT"
}
] | 2009-01-23T00:00:00 | [
[
"Cappelluti",
"E.",
""
],
[
"Ciuchi",
"S.",
""
],
[
"Fratini",
"S.",
""
]
] | [
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] |
801.4692 | Fernando Dobarro | Fernando Dobarro, Bulent Unal | Killing Vector Fields of Standard Static Space-times | 22 pages | null | null | null | math.DG gr-qc math-ph math.MP | null | We consider Killing vector fields on standard static space-times and obtain
equations for a vector field on a standard static space-time to be Killing. We
also provide a characterization of Killing vector fields on standard static
space-times with compact Riemannian parts.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 14:58:44 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Dobarro",
"Fernando",
""
],
[
"Unal",
"Bulent",
""
]
] | [
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] |
801.4693 | Burcu Baran | Burcu Baran | A Modular Curve of Level 9 and the Class Number One Problem | 18 pages | null | 10.1016/j.jnt.2008.09.013 | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we give an explicit parametrization of the modular curve
associated to the normalizer of a non-split Cartan subgroup of level 9. We
determine all integral points of this modular curve. As an application, we give
an alternative solution to the class number one problem.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:00:48 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Feb 2009 17:29:12 GMT"
}
] | 2009-02-18T00:00:00 | [
[
"Baran",
"Burcu",
""
]
] | [
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] |
801.4694 | Renato Musto | Renato Musto | From Heisenberg to Einstein? Recollections and afterthoughts on the
birth of string theory | Contribute to the collective volume "The birth of String Theory",
edited by A. Cappelli, E. Castellani, F. Colomo and P. Di Vecchia | null | null | null | physics.hist-ph | null | A few recollections and afterthoughts on the development of the string
picture of fundamental interactions out of the S-matrix program.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:02:12 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Musto",
"Renato",
""
]
] | [
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] |
801.4695 | Luigi Iapichino | L. Iapichino, J. Adamek, W. Schmidt, J. C. Niemeyer | Hydrodynamical adaptive mesh refinement simulations of turbulent flows -
I. Substructure in a wind | 11 pages, 14 figures. Small changes to match the version accepted by
MNRAS | null | 10.1111/j.1365-2966.2008.13137.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of the resolution of turbulent flows in adaptive mesh refinement
(AMR) simulations is investigated by means of 3D hydrodynamical simulations in
an idealised setup, representing a moving subcluster during a merger event. AMR
simulations performed with the usual refinement criteria based on local
gradients of selected variables do not properly resolve the production of
turbulence downstream of the cluster. Therefore we apply novel AMR criteria
which are optimised to follow the evolution of a turbulent flow. We demonstrate
that these criteria provide a better resolution of the flow past the
subcluster, allowing us to follow the onset of the shear instability, the
evolution of the turbulent wake and the subsequent back-reaction on the
subcluster core morphology. We discuss some implications for the modelling of
cluster cold fronts.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:32:48 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jul 2008 12:38:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iapichino",
"L.",
""
],
[
"Adamek",
"J.",
""
],
[
"Schmidt",
"W.",
""
],
[
"Niemeyer",
"J. C.",
""
]
] | [
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] |
801.4696 | Marieke Postma | Stephen C. Davis and Marieke Postma | SUGRA chaotic inflation and moduli stabilisation | 20 pages, 4 figures, refs added | JCAP0803:015,2008 | 10.1088/1475-7516/2008/03/015 | DESY 08-004 | hep-ph astro-ph hep-th | null | Chaotic inflation predicts a large gravitational wave signal which can be
tested by the upcoming Planck satellite. We discuss a SUGRA implementation of
chaotic inflation in the presence of moduli fields, and find that inflation
does not work with a generic KKLT moduli stabilisation potential. A viable
model can be constructed with a fine-tuned moduli sector, but only for a very
specific choice of Kahler potential. Our analysis also shows that inflation
models satisfying \partial_{i} W_{\rm inf}=0 for all inflation sector fields
\phi_i can be combined successfully with a fine-tuned moduli sector.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:15:18 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Mar 2008 13:52:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Davis",
"Stephen C.",
""
],
[
"Postma",
"Marieke",
""
]
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] |
801.4697 | Fabrice Silva | Fabrice Silva (LMA), Jean Kergomard (LMA) | Seuils d'instabilit\'e d'un instrument de musique \`a anche simple :
approche modale | null | Dans Actes du 18\`eme Congr\`es Fran\c{c}ais de M\'ecanique -
Seuils d'instabilit\'e d'un instrument de musique \`a anche simple : approche
modale, Grenoble : France (2007) | null | null | physics.class-ph | null | Many musical instruments, as for example woodwind instruments, flute or
violins, are self-sustained oscillating systems, i.e. musician enacts as a
continuous energy source to drive an oscillation in the passive resonator, the
body of the instrument, by means of a nonlinear coupling. For single reed
instruments like clarinet, there exists a minimal value of mouth pressure
beyond which sound can appear. This paper deals with the analysis of this
oscillation threshold, calculated using a modal decomposition of the resonator,
in order to have a better comprehension of how reed characteristics, such as
its strength and its damping, may influence the attack transient of notes.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:19:58 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Silva",
"Fabrice",
"",
"LMA"
],
[
"Kergomard",
"Jean",
"",
"LMA"
]
] | [
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] |
801.4698 | Stephane Vento | St\'ephane Vento (LAMA) | Asymptotic behavior for dissipative Korteweg-de Vrie equations | null | null | null | null | math.AP | null | We study the large time behavior of solutions to the dissipative Korteweg-de
Vrie equations $u_t+u_{xxx}+|D|^{\alpha}u+uu_x=0$ with $0<\alpha<2$. We find
$v$ such that $u-v$ decays like $t^{-r(\alpha)}$ as $t\to\infty$ in various
Sobolev norm.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:36:42 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Vento",
"Stéphane",
"",
"LAMA"
]
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] |
801.4699 | Maciej Dziemianczuk | M. Dziemia\'nczuk | On Cobweb Admissible Sequences - The Production Theorem | 6 pages | Proceedings of FCS'08, Interesting results, new models, and
methodologies, pp.163-165, July 14-17, 2008, Las Vegas, USA | null | null | math.CO cs.DM | null | In this note further clue decisive observations on cobweb admissible
sequences are shared with the audience. In particular an announced proof of the
Theorem 1 (by Dziemia\'nczuk) from [1] announced in India -Kolkata- December
2007 is delivered here. Namely here and there we claim that any cobweb
admissible sequence F is at the point product of primary cobweb admissible
sequences taking values one and/or certain power of an appropriate primary
number p.
Here also an algorithm to produce the family of all cobweb-admissible
sequences i.e. the Problem 1 from [1] i.e. one of several problems posed in
source papers [2,3] is solved using the idea and methods implicitly present
already in [4]
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:48:52 GMT"
}
] | 2009-09-13T00:00:00 | [
[
"Dziemiańczuk",
"M.",
""
]
] | [
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] |
801.47 | Andrea Fubini | Tony Apollaro, Alessandro Cuccoli, Andrea Fubini, Francesco Plastina,
and Paola Verrucchi | Staggered magnetization and entanglement enhancement by magnetic
impurities in $S=1/2$ spin chain | 4 pages, 8 figures | null | 10.1103/PhysRevA.77.062314 | null | cond-mat.stat-mech | null | We study the effects of a magnetic impurity on the behavior of a $S=1/2$ spin
chain. At T=0, both with and without an applied uniform magnetic field, an
oscillating magnetization appears, whose decay with the distance from the
impurity is ruled by a power law. As a consequence, pairwise entanglement is
either enhanced or quenched, depending on the distance of the spin pair with
respect to the impurity and on the values of the magnetic field and the
intensity of the impurity itself. This leads us to suggest that acting on such
control parameters, an adiabatic manipulation of the entanglement distribution
can be performed. The robustness of our results against temperature is checked,
and suggestions about possible experimental applications are put forward.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:42:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Apollaro",
"Tony",
""
],
[
"Cuccoli",
"Alessandro",
""
],
[
"Fubini",
"Andrea",
""
],
[
"Plastina",
"Francesco",
""
],
[
"Verrucchi",
"Paola",
""
]
] | [
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] |
801.4701 | Srutarshi Pradhan | Srutarshi Pradhan, Per C. Hemmer | Energy bursts in fiber bundle models of composite materials | 5 pages, 4 figs | Phys. Rev. E 77, 031138 (2008) | 10.1103/PhysRevE.77.031138 | null | cond-mat.stat-mech cond-mat.soft | null | As a model of composite materials, a bundle of many fibers with
stochastically distributed breaking thresholds for the individual fibers is
considered. The bundle is loaded until complete failure to capture the failure
scenario of composite materials under external load. The fibers are assumed to
share the load equally, and to obey Hookean elasticity right up to the breaking
point. We determine the distribution of bursts in which an amount of energy $E$
is released. The energy distribution follows asymptotically a universal power
law $E^{-5/2}$, for any statistical distribution of fiber strengths. A similar
power law dependence is found in some experimental acoustic emission studies of
loaded composite materials.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:50:15 GMT"
}
] | 2010-09-20T00:00:00 | [
[
"Pradhan",
"Srutarshi",
""
],
[
"Hemmer",
"Per C.",
""
]
] | [
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] |
801.4702 | Adolfo De Un\'anue | Adolfo De Un\'anue (1), Daniel Sudarsky (1) ((1) Instituto de Ciencias
Nucleares, Universidad Nacional Autonoma de Mexico, Ciudad de Mexico, Mexico) | Phenomenological analysis of quantum collapse as source of the seeds of
cosmic structure | 18 pages, 9 figures | Phys.Rev.D78:043510,2008 | 10.1103/PhysRevD.78.043510 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | The standard inflationary version of the origin of the cosmic structure as
the result of the quantum fluctuations during the early universe is less than
fully satisfactory as has been argued in [A. Perez, H. Sahlmann, and D.
Sudarsky, Class. Quantum Grav., 23, 2317, (2006)]. A proposal is made there of
a way to address the shortcomings by invoking a process similar to the collapse
of the quantum mechanical wave function of the various modes of the inflaton
field. This in turn was inspired on the ideas of R. Penrose about the role that
quantum gravity might play in bringing about such breakdown of the standard
unitary evolution of quantum mechanics. In this paper we study in some detail
the two schemes of collapse considered in the original work together with an
alternative scheme, which can be considered as "more natural" than the former
two. The new scheme, assumes that the collapse follows the correlations
indicated in the Wigner functional of the initial state. We end with
considerations regarding the degree to which the various schemes can be
expected to produce a spectrum that resembles the observed one.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:03:24 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Aug 2008 06:51:28 GMT"
}
] | 2012-05-30T00:00:00 | [
[
"De Unánue",
"Adolfo",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | [
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] |
801.4703 | Patrick Godon | E. M. Sion, B. T. Gaensicke, K. S. Long, P. Szkody, C. Knigge, I.
Hubeny, D. de Martino, P. Godon | Hubble Space Telescope STIS Spectroscopy of Long Period Dwarf Novae in
Quiescence | Accepted for publication in the Astrophysical Journal Part 1, 2008,
in press | null | 10.1086/586699 | null | astro-ph | null | We present the results of a synthetic spectral analysis of HST STIS spectra
of five long period dwarf novae obtained during their quiescence to determine
the properties of their white dwarfs which are little known for systems above
the CV period gap. The five systems, TU Men, BD Pav, SS Aur, TT Crt, and V442
Cen were observed as part of an HST Snapshot project. The spectra are described
and fitted with combinations of white dwarf photospheres and accretion disks.
We provide evidence that the white dwarfs in all five systems are at least
partially exposed. We discuss the evolutionary implications of our model
fitting results and compare these dwarf novae to previously analyzed FUV
spectra of other dwarf novae above the period gap. The dispersion in CV WD
temperatures above the period gap is substantially greater than one finds below
the period gap where there is a surprisingly narrow dispersion in temperatures
around 15,000K. There appears to be a larger spread of surface temperatures in
dwarf novae above the period than is seen below the gap.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:52:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sion",
"E. M.",
""
],
[
"Gaensicke",
"B. T.",
""
],
[
"Long",
"K. S.",
""
],
[
"Szkody",
"P.",
""
],
[
"Knigge",
"C.",
""
],
[
"Hubeny",
"I.",
""
],
[
"de Martino",
"D.",
""
],
[
"Godon",
"P.",
""
]
] | [
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-0.0279383734,
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-0.1436373591,
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0.0222600587,
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] |
801.4704 | Kathleen Reif | Kathleen Reif Volz | Hyperbolicity of arborescent tangles and arborescent links | 26 pages, 18 figures | null | null | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the hyperbolicity of arborescent tangles and
arborescent links. We will explicitly determine all essential surfaces in
arborescent tangle complements with non-negative Euler characteristic, and show
that given an arborescent tangle T, the complement X(T) is non-hyperbolic if
and only if T is a rational tangle, T=Q_m * T' for some m greater than or equal
to 1, or T contains Qn for some n greater than or equal to 2. We use these
results to prove a theorem of Bonahon and Seibenmann which says that a large
arborescent link L is non-hyperbolic if and only if it contains Q2.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:57:53 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Dec 2008 19:15:13 GMT"
}
] | 2008-12-01T00:00:00 | [
[
"Volz",
"Kathleen Reif",
""
]
] | [
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801.4705 | J\"org Schelter | J. Fuchs, J. Schelter, F. Ginelli, H. Hinrichsen | Local Persistence in the Directed Percolation Universality Class | LaTeX, 24 pages, 12 figures; references added and corrected, section
4.3 rewritten | J. Stat. Mech. P04015 (2008) | 10.1088/1742-5468/2008/04/P04015 | null | cond-mat.stat-mech | null | We revisit the problem of local persistence in directed percolation,
reporting improved estimates of the persistence exponent in 1+1 dimensions,
discovering strong corrections to scaling in higher dimensions, and
investigating the mean field limit. Moreover, we introduce a graded persistence
probability that a site does not flip more than n times and demonstrate how
local persistence can be studied in seed simulations. Finally, the problem of
spatial (as opposed to temporal) persistence is investigated.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:12:38 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Mar 2008 16:29:59 GMT"
}
] | 2008-04-16T00:00:00 | [
[
"Fuchs",
"J.",
""
],
[
"Schelter",
"J.",
""
],
[
"Ginelli",
"F.",
""
],
[
"Hinrichsen",
"H.",
""
]
] | [
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] |
801.4706 | Pedram Pad | P. Pad, F. Marvasti, K. Alishahi, S. Akbari | A Class of Errorless Codes for Over-loaded Synchronous Wireless and
Optical CDMA Systems | null | null | null | null | cs.IT math.CO math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we introduce a new class of codes for over-loaded synchronous
wireless and optical CDMA systems which increases the number of users for fixed
number of chips without introducing any errors. Equivalently, the chip rate can
be reduced for a given number of users, which implies bandwidth reduction for
downlink wireless systems. An upper bound for the maximum number of users for a
given number of chips is derived. Also, lower and upper bounds for the sum
channel capacity of a binary over-loaded CDMA are derived that can predict the
existence of such over-loaded codes. We also propose a simplified maximum
likelihood method for decoding these types of over-loaded codes. Although a
high percentage of the over-loading factor degrades the system performance in
noisy channels, simulation results show that this degradation is not
significant. More importantly, for moderate values of Eb/N0 (in the range of
6-10 dB) or higher, the proposed codes perform much better than the binary
Welch bound equality sequences.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:21:18 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Oct 2008 10:40:56 GMT"
},
{
"version": "v3",
"created": "Sat, 18 Oct 2008 11:45:23 GMT"
}
] | 2008-10-18T00:00:00 | [
[
"Pad",
"P.",
""
],
[
"Marvasti",
"F.",
""
],
[
"Alishahi",
"K.",
""
],
[
"Akbari",
"S.",
""
]
] | [
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] |
801.4707 | Toru T. Takahashi | Toru T. Takahashi and Teiji Kunihiro | Axial charges of N(1535) and N(1650) in lattice QCD with two flavors of
dynamical quarks | 5pages, 3 figures, 1 table; Confusing notations were corrected. (v2);
Results on N(1650) were added. (v3) | Phys.Rev.D78:011503,2008 | 10.1103/PhysRevD.78.011503 | null | hep-lat | null | We show the first lattice QCD results on the axial charge $g_A^{N^*N^*}$ of
$N^*(1535)$ and $N^*(1650)$. The measurements are performed with two flavors of
dynamical quarks employing the renormalization-group improved gauge action at
$\beta$=1.95 and the mean-field improved clover quark action with the hopping
parameters, $\kappa$=0.1375, 0.1390 and 0.1400. In order to properly separate
signals of $N^*(1535)$ and $N^*(1650)$, we construct 2$\times$2 correlation
matrices and diagonalize them. Wraparound contributions in the correlator,
which can be another source of signal contaminations, are eliminated by
imposing the Dirichlet boundary condition in the temporal direction. We find
that the axial charge of $N^*(1535)$ takes small values as $g_A^{N^*N^*}\sim
{\mathcal O}(0.1)$, whereas that of $N^*(1650)$ is about 0.5, which is found
independent of quark masses and consistent with the predictions by the naive
nonrelativistic quark model.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:24:33 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 02:31:02 GMT"
},
{
"version": "v3",
"created": "Wed, 4 Jun 2008 10:50:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Takahashi",
"Toru T.",
""
],
[
"Kunihiro",
"Teiji",
""
]
] | [
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] |
801.4708 | Marc Arnaudon | Marc Arnaudon (LMA), Anton Thalmaier, Feng-Yu Wang | Gradient Estimate and Harnack Inequality on Non-Compact Riemannian
Manifolds | null | null | null | null | math.PR | null | A new type of gradient estimate is established for diffusion semigroups on
non-compact complete Riemannian manifolds. As applications, a global Harnack
inequality with power and a heat kernel estimate are derived for diffusion
semigroups on arbitrary complete Riemannian manifolds.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:32:50 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Arnaudon",
"Marc",
"",
"LMA"
],
[
"Thalmaier",
"Anton",
""
],
[
"Wang",
"Feng-Yu",
""
]
] | [
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] |
801.4709 | Igor Yurkevich | A. S. Stepanenko, C. C. Constantinou, I. V. Yurkevich and I. V. Lerner | Temporal Correlations of Local Network Losses | null | Phys. Rev. E 77, 046115 (2008) | 10.1103/PhysRevE.77.046115 | null | cs.NI cond-mat.stat-mech | null | We introduce a continuum model describing data losses in a single node of a
packet-switched network (like the Internet) which preserves the discrete nature
of the data loss process. {\em By construction}, the model has critical
behavior with a sharp transition from exponentially small to finite losses with
increasing data arrival rate. We show that such a model exhibits strong
fluctuations in the loss rate at the critical point and non-Markovian power-law
correlations in time, in spite of the Markovian character of the data arrival
process. The continuum model allows for rather general incoming data packet
distributions and can be naturally generalized to consider the buffer server
idleness statistics.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:40:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stepanenko",
"A. S.",
""
],
[
"Constantinou",
"C. C.",
""
],
[
"Yurkevich",
"I. V.",
""
],
[
"Lerner",
"I. V.",
""
]
] | [
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] |
801.471 | Alberto Barchielli | A. Barchielli, M. gregoratti, M. Licciardo | Quantum trajectories, feedback and squeezing | 8 pages, 2 figures, "Noise Information & Complexity @ Quantum Scale"
Proceedings | IJQI 6 (2008) 581-587 | null | null | quant-ph | null | Quantum trajectory theory is the best mathematical set up to model continual
observations of a quantum system and feedback based on the observed output.
Inside this framework, we study how to enhance the squeezing of the
fluorescence light emitted by a two-level atom, stimulated by a coherent
monochromatic laser. In the presence of a Wiseman-Milburn feedback scheme,
based on the homodyne detection of a fraction of the emitted light, we analyze
the squeezing dependence on the various control parameters.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:47:04 GMT"
}
] | 2009-01-21T00:00:00 | [
[
"Barchielli",
"A.",
""
],
[
"gregoratti",
"M.",
""
],
[
"Licciardo",
"M.",
""
]
] | [
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] |
801.4711 | Rakhsha Nasseripour | Rakhsha Nasseripour, Brian Raue, Daniel Carman, Pawel Ambrozewicz, and
the CLAS Collaboration | Polarized Structure Function $\sigma_{LT'}$ for $p({\vec
e},e'K^+)\Lambda$ in the Nucleon Resonance Region | 2 tex files and 12 figures (14 eps files), 33 pages in one column
format | Phys.Rev.C77:065208,2008 | 10.1103/PhysRevC.77.065208 | null | nucl-ex | null | The first measurements of the polarized structure function $\sigma_{LT'}$ for
the reaction $p(\vec e,e'K^+)\Lambda$ in the nucleon resonance region are
reported. Measurements are included from threshold up to $W$=2.05 GeV for
central values of $Q^2$ of 0.65 and 1.00 GeV$^2$, and nearly the entire kaon
center-of-mass angular range. $\sigma_{LT'}$ is the imaginary part of the
longitudinal-transverse response and is expected to be sensitive to
interferences between competing intermediate s-channel resonances, as well as
resonant and non-resonant processes. The results for $\sigma_{LT'}$ are
comparable in magnitude to previously reported results from CLAS for
$\sigma_{LT}$, the real part of the same response. An intriguing sign change in
$\sigma_{LT'}$ is observed in the high $Q^2$ data at $W\approx 1.9$ GeV.
Comparisons to several existing model predictions are shown.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:49:34 GMT"
}
] | 2010-04-06T00:00:00 | [
[
"Nasseripour",
"Rakhsha",
""
],
[
"Raue",
"Brian",
""
],
[
"Carman",
"Daniel",
""
],
[
"Ambrozewicz",
"Pawel",
""
],
[
"Collaboration",
"the CLAS",
""
]
] | [
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] |
801.4712 | Georges Meynet | Andre Maeder, Georges Meynet, Sylvia Ekstrom, Raphael Hirschi, Cyril
Georgy | Massive Stars as Cosmic Engines through the Ages | 12 pages, 11 figures, to be published by CUP, F. Bresolin, P.A.
Crowther, J. Puls Eds | null | 10.1017/S1743921308020292 | null | astro-ph | null | Some useful developments in the model physics are briefly presented, followed
by model results on chemical enrichments and WR stars. We discuss the expected
rotation velocities of WR stars. We emphasize that the (C+O)/He ratio is a
better chemical indicator of evolution for WC stars than the C/He ratios. With
or without rotation, at a given luminosity the (C+O)/He ratios should be higher
in regions of lower metallicity Z. Also, for a given (C+O)/He ratio the WC
stars in lower Z regions have higher luminosities. The WO stars, which are
likely the progenitors of supernovae SNIc and of some GRBs, should
preferentially be found in regions of low Z and be the descendants of very high
initial masses. Finally, we emphasize the physical reasons why massive rotating
low Z stars may also experience heavy mass loss
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:59:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maeder",
"Andre",
""
],
[
"Meynet",
"Georges",
""
],
[
"Ekstrom",
"Sylvia",
""
],
[
"Hirschi",
"Raphael",
""
],
[
"Georgy",
"Cyril",
""
]
] | [
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] |
801.4713 | Sergei Kozyrev | S. Albeverio, S.V. Kozyrev | Frames of p-adic wavelets and orbits of the affine group | 18 pages, some commentaries added | p-Adic Numbers, Ultrametric Analysis and Applications. 2009. V.1.
N.1. P.18-33 | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general construction of frames of p-adic wavelets is described. We
consider the orbit of a mean zero generic locally constant function with
compact support (mean zero test function) with respect to the action of the
p-adic affine group and show that this orbit is a uniform tight frame. We
discuss relation of this result to the multiresolution wavelet analysis.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:01:30 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Aug 2008 15:23:41 GMT"
}
] | 2011-05-10T00:00:00 | [
[
"Albeverio",
"S.",
""
],
[
"Kozyrev",
"S. V.",
""
]
] | [
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] |
801.4714 | Miroslava Sotakova | Miroslava Sotakova | Breaking One-Round Key-Agreement Protocols in the Random Oracle Model | 6 pages | null | null | null | cs.CC cs.CR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study one-round key-agreement protocols analogous to
Merkle's puzzles in the random oracle model. The players Alice and Bob are
allowed to query a random permutation oracle $n$ times and upon their queries
and communication, they both output the same key with high probability. We
prove that Eve can always break such a protocol by querying the oracle $O(n^2)$
times. The long-time unproven optimality of the quadratic bound in the fully
general, multi-round scenario has been shown recently by Barak and
Mahmoody-Ghidary. The results in this paper have been found independently of
their work.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:34:34 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 21:02:49 GMT"
},
{
"version": "v3",
"created": "Tue, 24 Mar 2009 12:17:31 GMT"
}
] | 2009-03-24T00:00:00 | [
[
"Sotakova",
"Miroslava",
""
]
] | [
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] |
801.4715 | Alexander Rezounenko V | Alexander V. Rezounenko | Differential equations with discrete state-dependent delay: uniqueness
and well-posedness in the space of continuous functions | null | Nonlinear Analysis Series A: Theory, Methods & Applications,
Volume 70, Issue 11 (1 June 2009), Pages 3978-3986 | 10.1016/j.na.2008.08.006 | null | math.AP math.DS | null | Partial differential equations with discrete (concentrated) state-dependent
delays in the space of continuous functions are investigated. In general, the
corresponding initial value problem is not well posed, so we find an additional
assumption on the state-dependent delay function to guarantee the well
posedness. For the constructed dynamical system we study the long-time
asymptotic behavior and prove the existence of a compact global attractor.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:07:23 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 19:00:52 GMT"
}
] | 2014-12-16T00:00:00 | [
[
"Rezounenko",
"Alexander V.",
""
]
] | [
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] |
801.4716 | Jean-Yves Antoine | Tonio Wandmacher, Jean-Yves Antoine | Methods to integrate a language model with semantic information for a
word prediction component | 10 pages ; EMNLP'2007 Conference (Prague) | null | null | null | cs.CL | null | Most current word prediction systems make use of n-gram language models (LM)
to estimate the probability of the following word in a phrase. In the past
years there have been many attempts to enrich such language models with further
syntactic or semantic information. We want to explore the predictive powers of
Latent Semantic Analysis (LSA), a method that has been shown to provide
reliable information on long-distance semantic dependencies between words in a
context. We present and evaluate here several methods that integrate LSA-based
information with a standard language model: a semantic cache, partial
reranking, and different forms of interpolation. We found that all methods show
significant improvements, compared to the 4-gram baseline, and most of them to
a simple cache model as well.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:10:24 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Wandmacher",
"Tonio",
""
],
[
"Antoine",
"Jean-Yves",
""
]
] | [
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] |
801.4717 | Iasson Karafyllis | Iasson Karafyllis and Zhong-Ping Jiang | Necessary and Sufficient Lyapunov-Like Conditions for Robust Nonlinear
Stabilization | 44 pages | null | null | null | math.OC | null | In this work, we propose a methodology for the expression of necessary and
sufficient Lyapunov-like conditions for the existence of stabilizing feedback
laws. The methodology is an extension of the well-known Control Lyapunov
Function (CLF) method and can be applied to very general nonlinear time-varying
systems with disturbance and control inputs, including both finite- and
infinite-dimensional systems. The generality of the proposed methodology is
also reflected upon by the fact that partial stability with respect to output
variables is addressed. In addition, it is shown that the generalized CLF
method can lead to a novel tool for the explicit design of robust nonlinear
controllers for a class of time-delay nonlinear systems with a triangular
structure.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:11:39 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Karafyllis",
"Iasson",
""
],
[
"Jiang",
"Zhong-Ping",
""
]
] | [
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] |
801.4718 | Xiangjun Xing | Monwhea Jeng, Mark J. Bowick, Werner Krauth, Jennifer Schwarz, and
Xiangjun Xing | Vacancy diffusion in the triangular lattice dimer model | 15 pages, 27 eps figures. submitted to Physical Review E | Phys. Rev. E78 (2008) 021112 | 10.1103/PhysRevE.78.021112 | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study vacancy diffusion on the classical triangular lattice dimer model,
sub ject to the kinetic constraint that dimers can only translate, but not
rotate. A single vacancy, i.e. a monomer, in an otherwise fully packed lattice,
is always localized in a tree-like structure. The distribution of tree sizes is
asymptotically exponential and has an average of 8.16 \pm 0.01 sites. A
connected pair of monomers has a finite probability of being delocalized. When
delocalized, the diffusion of monomers is anomalous:
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 18:30:58 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jun 2008 23:43:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jeng",
"Monwhea",
""
],
[
"Bowick",
"Mark J.",
""
],
[
"Krauth",
"Werner",
""
],
[
"Schwarz",
"Jennifer",
""
],
[
"Xing",
"Xiangjun",
""
]
] | [
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] |
801.4719 | Markus Bolte | Markus Bolte, Guido Meier, Benjamin Krueger, Andre Drews, Rene Eiselt,
Lars Bocklage, Stellan Bohlens, Tolek Tyliszczak, Arne Vansteenkiste, Bartel
Van Waeyenberge, Kang Wei Chou, Aleksandar Puzic, and Hermann Stoll | Time-Resolved X-ray Microscopy of Spin-Torque-Induced Magnetic Vortex
Gyration | 10 pages, 3 figures | null | 10.1103/PhysRevLett.100.176601 | null | cond-mat.other cond-mat.mtrl-sci | null | Time-resolved X-ray microscopy is used to image the influence of alternating
high-density currents on the magnetization dynamics of ferromagnetic vortices.
Spin-torque induced vortex gyration is observed in micrometer-sized permalloy
squares. The phases of the gyration in structures with different chirality are
compared to an analytical model and micromagnetic simulations, considering both
alternating spinpolarized currents and the current's Oersted field. In our case
the driving force due to spin-transfer torque is about 70% of the total
excitation while the remainder originates from the current's Oersted field.
This finding has implications to magnetic storage devices using spin-torque
driven magnetization switching and domain-wall motion.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:22:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bolte",
"Markus",
""
],
[
"Meier",
"Guido",
""
],
[
"Krueger",
"Benjamin",
""
],
[
"Drews",
"Andre",
""
],
[
"Eiselt",
"Rene",
""
],
[
"Bocklage",
"Lars",
""
],
[
"Bohlens",
"Stellan",
""
],
[
"Tyliszczak",
"Tolek",
""
],
[
"Vansteenkiste",
"Arne",
""
],
[
"Van Waeyenberge",
"Bartel",
""
],
[
"Chou",
"Kang Wei",
""
],
[
"Puzic",
"Aleksandar",
""
],
[
"Stoll",
"Hermann",
""
]
] | [
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] |
801.472 | Christian Beck | Muhammad Maher, Christian Beck | Chaotic quantization and the mass spectrum of fermions | 8 pages, 6 figures. To appear in Chaos, Solitons and Fractals (2008) | ChaosSolitonsFractals37:9-15,2008 | 10.1016/j.chaos.2007.11.006 | null | hep-th | null | In order to understand the parameters of the standard model of electroweak
and strong interactions, one needs to embed the standard model into some larger
theory that accounts for the observed values. This means some additional sector
is needed that fixes and stabilizes the values of the fundamental constants of
nature. We describe how such a sector can be constructed using the so-called
chaotic quantization method applied to a system of coupled map lattices. We
restrict ourselves in this short note on verifying how our model correctly
yields the numerical values of Yukawa and gravitational coupling constants of a
collection of heavy and light fermions using a simple principle, the local
minimization of vacuum energy.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:23:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Maher",
"Muhammad",
""
],
[
"Beck",
"Christian",
""
]
] | [
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-0.0615583025,
-0.0128471637,
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-0.0349059664,
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] |
801.4721 | Teiko Heinosaari | Claudio Carmeli, Teiko Heinosaari, Juha-Pekka Pellonp\"a\"a,
Alessandro Toigo | Extremal covariant positive operator valued measures: the case of a
compact symmetry group | minor corrections in version 2 | J. Math. Phys. 49, 063504 (2008) | 10.1063/1.2940328 | null | math-ph math.MP quant-ph | null | Given a unitary representation U of a compact group G and a transitive
G-space $\Omega$, we characterize the extremal elements of the convex set of
all U-covariant positive operator valued measures.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:23:16 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 08:03:59 GMT"
}
] | 2008-06-20T00:00:00 | [
[
"Carmeli",
"Claudio",
""
],
[
"Heinosaari",
"Teiko",
""
],
[
"Pellonpää",
"Juha-Pekka",
""
],
[
"Toigo",
"Alessandro",
""
]
] | [
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] |
801.4722 | Farhang Radjai | Farhang Radjai (LMGC) | Particle-scale origins of shear strength in granular media | null | null | 10.1016/j.compgeo.2013.01.001 | null | cond-mat.soft | null | The shear strength of cohesionless granular materials is generally attributed
to the compactness or anisotropy of their microstructure. An open issue is how
such compact or anisotropic microstructures, and thus the shear strength,
depend on the particle properties. We first recall the role of fabric and force
anisotropies with respect to the critical-state shear stress. Then, a model of
accessible geometrical states in terms of particle connectivity and contact
anisotropy is presented. This model incorporates in a simple way the fact that,
due to steric exclusions, the highest levels of connectivity and anisotropy
cannot be reached simultaneously, a property that affects seriously the shear
strength. We also analyze the force anisotropy in the light of the specific
role of weak forces in sustaining strong force chains and thus the main
mechanism that underlies anisotropic force patterns. Finally, we briefly
discuss the effect of interparticle friction, particle shape, size
polydispersity and adhesion.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:29:40 GMT"
}
] | 2013-02-13T00:00:00 | [
[
"Radjai",
"Farhang",
"",
"LMGC"
]
] | [
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0.0014199063,
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] |
801.4723 | Victoria Gitman | Victoria Gitman | Ramsey-like cardinals | null | null | null | null | math.LO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the numerous characterizations of a Ramsey cardinal kappa involves the
existence of certain types of elementary embeddings for transitive sets of size
\kappa satisfying a large fragment of ZFC. We introduce new large cardinal
axioms generalizing the Ramsey elementary embeddings characterization and show
that they form a natural hierarchy between weakly compact cardinals and
measurable cardinals. These new axioms serve to further our knowledge about the
elementary embedding properties of smaller large cardinals, in particular those
still consistent with V=L.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:32:42 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Apr 2011 13:59:07 GMT"
}
] | 2011-04-25T00:00:00 | [
[
"Gitman",
"Victoria",
""
]
] | [
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-0.0362259932,
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] |
801.4724 | Thomas Wiegelmann | T. Wiegelmann, L.D. Xia, E. Marsch | Links between magnetic fields and plasma flows in a coronal hole | 4 pages, 3 figures | Astron.Astrophys.432:L 1,2005 | 10.1051/0004-6361:200500029 | null | astro-ph | null | We compare the small-scale features visible in the Ne viii Doppler-shift map
of an equatorial coronal hole (CH) as observed by SUMER with the small-scale
structures of the magnetic field as constructed from a simultaneous
photospheric magnetogram by a potential magnetic-field extrapolation. The
combined data set is analysed with respect to the small-scale flows of coronal
matter, which means that the Ne viii Doppler-shift used as tracer of the plasma
flow is investigated in close connection with the ambient magnetic field. Some
small closed-field regions in this largely open CH are also found in the
coronal volume considered. The Doppler-shift patterns are found to be clearly
linked with the field topology.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:32:56 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Wiegelmann",
"T.",
""
],
[
"Xia",
"L. D.",
""
],
[
"Marsch",
"E.",
""
]
] | [
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801.4725 | Alexander Gnedin | Alexander V. Gnedin, Alexander M. Iksanov, Pavlo Negadajlov, Uwe
R\"osler | The Bernoulli sieve revisited | Published in at http://dx.doi.org/10.1214/08-AAP592 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2009, Vol. 19, No. 4, 1634-1655 | 10.1214/08-AAP592 | IMS-AAP-AAP592 | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an occupancy scheme in which "balls" are identified with $n$
points sampled from the standard exponential distribution, while the role of
"boxes" is played by the spacings induced by an independent random walk with
positive and nonlattice steps. We discuss the asymptotic behavior of five
quantities: the index $K_n^*$ of the last occupied box, the number $K_n$ of
occupied boxes, the number $K_{n,0}$ of empty boxes whose index is at most
$K_n^*$, the index $W_n$ of the first empty box and the number of balls $Z_n$
in the last occupied box. It is shown that the limiting distribution of
properly scaled and centered $K_n^*$ coincides with that of the number of
renewals not exceeding $\log n$. A similar result is shown for $K_n$ and $W_n$
under a side condition that prevents occurrence of very small boxes. The
condition also ensures that $K_{n,0}$ converges in distribution. Limiting
results for $Z_n$ are established under an assumption of regular variation.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:34:03 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Sep 2009 08:54:13 GMT"
}
] | 2009-09-01T00:00:00 | [
[
"Gnedin",
"Alexander V.",
""
],
[
"Iksanov",
"Alexander M.",
""
],
[
"Negadajlov",
"Pavlo",
""
],
[
"Rösler",
"Uwe",
""
]
] | [
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] |
801.4726 | Sergey Nikitin | S. Nikitin | Stochastic extrema as stationary phases of characteristic functions | null | null | null | null | math.PR math.ST stat.AP stat.TH | null | The paper is dealing with semi-classical asymptotics of a characteristic
function for a stochastic process. The main technical tool is provided by the
stationary phase method. The extremal range for a stochastic process is defined
by limit values of the complex logarithm of the characteristic function. The
paper also outlines a numerical method for calculating stochastic extrema.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:35:40 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Nikitin",
"S.",
""
]
] | [
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] |
801.4727 | Ullmo Denis | Pierre Carmier (LPTMS), Ullmo Denis (LPTMS) | Berry phase in graphene: a semiclassical perspective | null | null | 10.1103/PhysRevB.77.245413 | null | cond-mat.mes-hall | null | We derive a semiclassical expression for the Green's function in graphene, in
which the presence of a semiclassical phase is made apparent. The relationship
between this semiclassical phase and the adiabatic Berry phase, usually
referred to in this context, is discussed. These phases coincide for the
perfectly linear Dirac dispersion relation. They differ however when a gap is
opened at the Dirac point. We furthermore present several applications of our
semiclassical formalism. In particular we provide, for various configurations,
a semiclassical derivation of the electron's Landau levels, illustrating the
role of the semiclassical ``Berry-like'' phase
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:39:07 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 09:17:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Carmier",
"Pierre",
"",
"LPTMS"
],
[
"Denis",
"Ullmo",
"",
"LPTMS"
]
] | [
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801.4728 | Douglas Singleton | Max Chaves and Douglas Singleton | A Unified Model of Phantom Energy and Dark Matter | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4:009,2008 | 10.3842/SIGMA.2008.009 | null | hep-th gr-qc | null | To explain the acceleration of the cosmological expansion researchers have
considered an unusual form of mass-energy generically called dark energy. Dark
energy has a ratio of pressure over mass density which obeys $w=p/\rho <-1/3$.
This form of mass-energy leads to accelerated expansion. An extreme form of
dark energy, called phantom energy, has been proposed which has $w=p/\rho <-1$.
This possibility is favored by the observational data. The simplest model for
phantom energy involves the introduction of a scalar field with a negative
kinetic energy term. Here we show that theories based on graded Lie algebras
naturally have such a negative kinetic energy and thus give a model for phantom
energy in a less ad hoc manner. We find that the model also contains ordinary
scalar fields and anti-commuting (Grassmann) vector fields which act as a form
of two component dark matter. Thus from a gauge theory based on a graded
algebra we naturally obtained both phantom energy and dark matter.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:44:43 GMT"
}
] | 2008-12-19T00:00:00 | [
[
"Chaves",
"Max",
""
],
[
"Singleton",
"Douglas",
""
]
] | [
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801.4729 | Luigi Iapichino | L. Iapichino, J. C. Niemeyer | Hydrodynamical adaptive mesh refinement simulations of turbulent flows -
II. Cosmological simulations of galaxy clusters | 13 pages, 14 figures, accepted for publication in MNRAS. Section
4.3.1 (convergence tests of the AMR criteria) and further minor changes added
during the reviewing stage. Errors have been corrected in Table 3, but the
conclusions are not affected | null | 10.1111/j.1365-2966.2008.13518.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The development of turbulent gas flows in the intra-cluster medium and in the
core of a galaxy cluster is studied by means of adaptive mesh refinement (AMR)
cosmological simulations. A series of six runs was performed, employing
identical simulation parameters but different criteria for triggering the mesh
refinement. In particular, two different AMR strategies were followed, based on
the regional variability of control variables of the flow and on the
overdensity of subclumps, respectively. We show that both approaches, albeit
with different results, are useful to get an improved resolution of the
turbulent flow in the ICM. The vorticity is used as a diagnostic for
turbulence, showing that the turbulent flow is not highly volume-filling but
has a large area-covering factor, in agreement with previous theoretical
expectations. The measured turbulent velocity in the cluster core is larger
than 200 km/s, and the level of turbulent pressure contribution to the cluster
hydrostatic equilibrium is increased by using the improved AMR criteria.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:03:15 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jul 2008 13:44:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iapichino",
"L.",
""
],
[
"Niemeyer",
"J. C.",
""
]
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] |
801.473 | John Lestone Dr | S. G. McCalla and J. P. Lestone | Fission Decay Widths for Heavy-Ion Fusion-Fission Reactions | 14 pg, 6 fig, submitted to Physical Review | Phys.Rev.Lett.101:032702,2008 | 10.1103/PhysRevLett.101.032702 | LA-UR-08-0207 | nucl-th | null | Cross-section and neutron-emission data from heavy-ion fusion-fission
reactions are consistent with a Kramers-modified statistical model which takes
into account the collective motion of the system about the ground state; the
temperature dependence of the location of fission transition points; and the
orientation degree of freedom. We see no evidence to suggest that the nuclear
viscosity departs from the surface-plus-window dissipation model. The strong
increase in the nuclear viscosity above a temperature of ~1 MeV deduced by
others is an artifact generated by an inadequate fission model.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 18:04:47 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 21:28:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"McCalla",
"S. G.",
""
],
[
"Lestone",
"J. P.",
""
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801.4731 | Sergey Nikitin | S. Nikitin | Stabilization of nonlinear systems with semi-quadratic cost | null | null | null | null | math.OC | null | The paper addresses the stabilization of nonlinear systems with
semi-quadratic cost: quadratic with respect to controls and nonlinear for state
variables. Paper presents the effective new feedback synthesis procedure. The
novel feedback design procedure is based on the ideas borrowed from nonlinear
optics and the theory of semi-classical asymptotics.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:55:39 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Nikitin",
"S.",
""
]
] | [
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801.4732 | Giuseppe Murante | Anna Curir (1), Paola Mazzei (2) and Giuseppe Murante (1) ((1)
INAF-Osservatorio Astronomico di Torino, (2) INAF-Osservatorio Astronomico di
Padova) | Star formation and bar instability in cosmological haloes | 10 pages, 21 figures, A&A accepted | null | 10.1051/0004-6361:20078285 | null | astro-ph | null | This is the third of a series of papers presenting the first attempt to
analyze the growth of the bar instability in a consistent cosmological
scenario. In the previous two articles we explored the role of the cosmology on
stellar disks, and the impact of the gaseous component on a disk embedded in a
cosmological dark matter halo. The aim of this paper is to point out the impact
of the star formation on the bar instability inside disks having different gas
fractions. We perform cosmological simulations of the same disk-to-halo mass
systems as in the previous works where the star formation was not triggered. We
compare the results of the new simulations with the previous ones to
investigate the effect of the star formation by analysing the morphology of the
stellar components, the bar strength, the behaviour of the pattern speed. We
follow the gas and the central mass concentration during the evolution and
their impact on the bar strength. In all our cosmological simulations a stellar
bar, lasting 10 Gyr, is still living at z=0. The central mass concentration of
gas and of the new stars has a mild action on the ellipticity of the bar but is
not able to destroy it; at z=0 the stellar bar strength is enhanced by the star
formation. The bar pattern speed is decreasing with the disk evolution.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 18:07:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Curir",
"Anna",
""
],
[
"Mazzei",
"Paola",
""
],
[
"Murante",
"Giuseppe",
""
]
] | [
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] |
801.4733 | Frances Kirwan | Aravind Asok, Brent Doran, Frances Kirwan | Yang-Mills theory and Tamagawa numbers | Accepted for publication in the Bulletin of the London Mathematical
Society | null | 10.1112/blms/bdn036 | null | math.AG | null | Atiyah and Bott used equivariant Morse theory applied to the Yang-Mills
functional to calculate the Betti numbers of moduli spaces of vector bundles
over a Riemann surface, rederiving inductive formulae obtained from an
arithmetic approach which involved the Tamagawa number of SL_n. This article
surveys this link between Yang-Mills theory and Tamagawa numbers, and explains
how methods used over the last three decades to study the singular cohomology
of moduli spaces of bundles on a smooth complex projective curve can be adapted
to the setting of A^1-homotopy theory to study the motivic cohomology of these
moduli spaces.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 18:03:54 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Asok",
"Aravind",
""
],
[
"Doran",
"Brent",
""
],
[
"Kirwan",
"Frances",
""
]
] | [
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] |
801.4734 | Alexander Kusenko | Alexander Kusenko, Bhabani Prasad Mandal, Alok Mukherjee | Delayed pulsar kicks from the emission of sterile neutrinos | 4 pages, 1 figure; some discussion and references added; final
version | Phys.Rev.D77:123009,2008 | 10.1103/PhysRevD.77.123009 | UCLA/08/TEP/03 | astro-ph hep-ph | null | The observed velocities of pulsars suggest the possibility that sterile
neutrinos with mass of several keV are emitted from a cooling neutron star. The
same sterile neutrinos could constitute all or part of cosmological dark
matter. The neutrino-driven kicks can exhibit delays depending on the mass and
the mixing angle, which can be compared with the pulsar data. We discuss the
allowed ranges of sterile neutrino parameters, consistent with the latest
cosmological and X-ray bounds, which can explain the pulsar kicks for different
delay times.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 18:26:14 GMT"
},
{
"version": "v2",
"created": "Thu, 22 May 2008 21:53:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kusenko",
"Alexander",
""
],
[
"Mandal",
"Bhabani Prasad",
""
],
[
"Mukherjee",
"Alok",
""
]
] | [
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] |
801.4735 | Tom Mestdag | M. Crampin and T. Mestdag | The inverse problem for invariant Lagrangians on a Lie group | 31 pages | Journal of Lie Theory 18 (2008), 471-502. | null | null | math.DG math-ph math.MP | null | We discuss the problem of the existence of a regular invariant Lagrangian for
a given system of invariant second-order differential equations on a Lie group
$G$, using approaches based on the Helmholtz conditions. Although we deal with
the problem directly on $TG$, our main result relies on a reduction of the
system on $TG$ to a system on the Lie algebra of $G$. We conclude with some
illustrative examples.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 18:31:17 GMT"
}
] | 2008-04-21T00:00:00 | [
[
"Crampin",
"M.",
""
],
[
"Mestdag",
"T.",
""
]
] | [
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] |
801.4736 | E. H. Hwang | E. H. Hwang and S. Das Sarma | Single particle relaxation time versus transport scattering time in a 2D
graphene layer | 7 pages, 4 figures | Phys. Rev. B 77, 195412 (2008) | 10.1103/PhysRevB.77.195412 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | We theoretically calculate and compare the single-particle relaxation time
($\tau_s$) defining quantum level broadening and the transport scattering time
($\tau_t$) defining Drude conductivity in 2D graphene layers in the presence of
screened charged impurities scattering and short-range defect scattering. We
find that the ratio $\tau_t/\tau_s$ increases strongly with increasing $k_F
z_i$ and $\kappa$ where $k_F$, $z_i$, and $\kappa$ are respectively the Fermi
wave vector, the separation of the substrate charged impurities from the
graphene layer, and the background lattice dielectric constant. A critical
quantitative comparison of the $\tau_t/\tau_s$ results for graphene with the
corresponding modulation-doped semiconductor structures is provided, showing
significant differences between these two 2D carrier systems.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 18:46:39 GMT"
}
] | 2008-05-12T00:00:00 | [
[
"Hwang",
"E. H.",
""
],
[
"Sarma",
"S. Das",
""
]
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] |
801.4737 | Je-An Gu | Je-an Gu | Automatic Control over the Cosmological Constant through Non-minimal
Phantom and Quintessence | 5 pages, 3 tables, LaTeX | null | null | null | hep-th | null | A mechanism to control the cosmological constant through a scalar field
non-minimally coupled to gravity is proposed. By utilizing non-minimal phantom
or quintessence, the cosmological constant, which may be large originally, can
be automatically driven to a value on the scale of the mass parameter in the
phantom/quintessence potential V(phi). The reduction of a large cosmological
constant involves the weakening of gravity that therefore may be much stronger
initially. There exist the cases where originally gravity is on the TeV scale
so that the hierarchy between gravity and three gauge interactions in the
standard model of particle physics is bridged at the beginning. Although the
cosmological constant can be automatically tuned or largely reduced under this
mechanism, its energy density may still remain on the same order of magnitude
as the original one. Thus, explaining the smallness of the
observation-suggested cosmological constant energy density is still a difficult
mission yet to be completed.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:00:35 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Gu",
"Je-an",
""
]
] | [
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801.4738 | G. S. Bisnovatyi-Kogan | G.S. Bisnovatyi-Kogan | Binary recycled pulsars, as a most precise physical laboratory | Invited talk in The Fourth scientific conference in honor of Bohdan
Babiy "Selected Issues of Astronomy and Astrophysics", 19-21 October 2006 in
Lviv (Ukraine) | J.Phys.Stud.11:450-456,2007 | null | null | astro-ph | null | The following problems are discussed. 1. Pulsars and close binaries. 2.
Hulse-Taylor pulsar. 3. Disrupted pulsar pairs. 4. RP statistics. 5. Enhanced
evaporation: formation of single RP. 6. General relativity effects: NS+NS. 7. A
Double pulsar system. 8. Checking general relativity. 9. Variability of the
gravitational constant. 10. Space Watch.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:01:33 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 15:10:53 GMT"
}
] | 2009-07-30T00:00:00 | [
[
"Bisnovatyi-Kogan",
"G. S.",
""
]
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] |
801.4739 | Stephen Adler | Stephen L. Adler, J. Gamboa, F. Mendez, J. Lopez-Sarrion | Axions and "Light Shining Through a Wall": A Detailed Theoretical
Analysis | Latex, one eps figure, 19 pages; Added Note | AnnalsPhys.323:2851-2872,2008 | 10.1016/j.aop.2008.02.001 | null | hep-ph | null | We give a detailed study of axion-photon and photon-axion conversion
amplitudes, which enter the analysis of ``light shining through a wall''
experiments. Several different calculational methods are employed and compared,
and in all cases we retain a nonzero axion mass. To leading order, we find that
when the photon frequency $\omega$ is very close to the axion mass $m$, there
is a threshold cusp which significantly enhances the photon to axion conversion
amplitude, by a factor $\omega/\sqrt{\omega^2-m^2}$ relative to the
corresponding axion to photon conversion process. When $m=0$, the enhancement
factor reduces to unity and the results of previous calculations are recovered.
Our calculations include an exact wave matching analysis, which shows how
unitarity is maintained near threshold at $\omega=m$, and a discussion of the
case when the magnetic field extends into the ``wall'' region.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:57:47 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Feb 2008 16:26:00 GMT"
},
{
"version": "v3",
"created": "Tue, 26 Feb 2008 18:53:01 GMT"
},
{
"version": "v4",
"created": "Wed, 5 Mar 2008 20:43:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Adler",
"Stephen L.",
""
],
[
"Gamboa",
"J.",
""
],
[
"Mendez",
"F.",
""
],
[
"Lopez-Sarrion",
"J.",
""
]
] | [
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801.474 | Ivona Grzegorczyk Prof. Dr. | Ivona Grzegorczyk, Montserrat Teixidor I. Bigas | Brill-Noether Theory for stable vector bundles | null | null | null | null | math.AG | null | This paper gives an overview of the main results of Brill-Noether Theory for
vector bundles on algebraic curves.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 18:12:37 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Grzegorczyk",
"Ivona",
""
],
[
"Bigas",
"Montserrat Teixidor I.",
""
]
] | [
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801.4741 | Alexander Gaifullin | Alexander A. Gaifullin | Construction of combinatorial manifolds with the prescribed sets of
links of vertices | 49 pages | null | null | null | math.GT math.CO | null | To each oriented closed combinatorial manifold we assign the set (with
repetitions) of isomorphism classes of links of its vertices. The obtained
transformation L is the main object of study of the present paper. We pose a
problem on the inversion of the transformation L. We shall show that this
problem is closely related to N.Steenrod's problem on realization of cycles and
to the Rokhlin-Schwartz-Thom construction of combinatorial Pontryagin classes.
It is easy to obtain a condition of balancing that is a necessary condition for
a set of isomorphism classes of combinatorial spheres to belong to the image of
the transformation L. In the present paper we give an explicit construction
providing that each balanced set of isomorphism classes of combinatorial
spheres gets into the image of L after passing to a multiple set and adding
several pairs of the form (Z,-Z), where -Z is the sphere Z with the orientation
reversed. This construction enables us, for a given singular simplicial cycle
of a space R, to construct explicitly a combinatorial manifold M and a mapping
$\phi:M\to R$ such that $\phi_*[M]=r[\xi]$ for some positive integer r. The
construction is based on resolving singularities of the cycle $\xi$. We give
applications of our main construction to cobordisms of manifolds with
singularities and cobordisms of simple cells. In particular, we prove that
every rational additive invariant of cobordisms of manifolds with singularities
admits a local formula. Another application is the construction of explicit
(though inefficient) local combinatorial formulae for polynomials in the
rational Pontryagin classes of combinatorial manifolds.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:16:30 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Gaifullin",
"Alexander A.",
""
]
] | [
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] |
801.4742 | Saeeda Sajjad | S. Sajjad, A. Falvard, G. Vasileiadis | Future imaging atmospheric telescopes: performance of possible array
configurations for gamma photons in the GeV-TeV range | 4 pages, 4 figures, Proceedings of the 30th ICRC, Merida, Mexico
(2007) | null | null | null | astro-ph | null | The future of ground based gamma ray astronomy lies in large arrays of
Imaging Atmospheric Cherenkov Telescopes (IACT) with better capabilities: lower
energy threshold, higher sensitivity, better resolution and background
rejection. Currently, designs for the next generation of IACT arrays are being
explored by various groups. We have studied possible configurations with a
large number of telescopes of various sizes. Here, we present the precision of
source, shower core and energy reconstruction for gamma rays in the GeV-TeV
range for different altitudes of observation. These results were obtained
through tools that we have developed in order to simulate any type of IACT
configuration and evaluate its performance.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:47:43 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Sajjad",
"S.",
""
],
[
"Falvard",
"A.",
""
],
[
"Vasileiadis",
"G.",
""
]
] | [
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] |
801.4743 | Sean Sather-Wagstaff | Sean Sather-Wagstaff | Lower bounds for the number of semidualizing complexes over a local ring | v2: title changed, section 4 added, minor changes throughout; 10
pages | null | null | null | math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the set S(R) of shift-isomorphism classes of semidualizing
R-complexes, ordered via the reflexivity relation, where R is a commutative
noetherian local ring. Specifically, we study the question of whether S(R$ has
cardinality 2^n for some n. We show that, if there is a chain of length n in
S(R) and if the reflexivity ordering on S(R) is transitive, then S(R) has
cardinality at least 2^n, and we explicitly describe some of its
order-structure. We also show that, given a local ring homomorphism f: R\to S
of finite flat dimension, if R and S admit dualizing complexes and if f is not
Gorenstein, then the cardinality of S(S) is at least twice the cardinality of
S(R).
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:34:25 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Mar 2009 22:12:09 GMT"
}
] | 2009-03-14T00:00:00 | [
[
"Sather-Wagstaff",
"Sean",
""
]
] | [
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-0.0114970347,
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] |
801.4744 | Roberto D. Mota Esteves | R. D. Mota, M. A. Xicotencatl and V. D. Granados | Jordan-Schwinger map, 3D harmonic oscillator constants of motion, and
classical and quantum parameters characterizing electromagnetic wave
polarization | null | J.Phys.A37:2835-2842,2004 | 10.1088/0305-4470/37/7/022 | null | math-ph math.MP | null | In this work we introduce a generalization of the Jauch and Rohrlich quantum
Stokes operators when the arrival direction from the source is unknown {\it a
priori}. We define the generalized Stokes operators as the Jordan-Schwinger map
of a triplet of harmonic oscillators with the Gell-Mann and Ne'eman SU(3)
symmetry group matrices. We show that the elements of the Jordan-Schwinger map
are the constants of motion of the three-dimensional isotropic harmonic
oscillator. Also, we show that generalized Stokes Operators together with the
Gell-Mann and Ne'eman matrices may be used to expand the polarization density
matrix. By taking the expectation value of the Stokes operators in a three-mode
coherent state of the electromagnetic field, we obtain the corresponding
generalized classical Stokes parameters. Finally, by means of the constants of
motion of the classical three-dimensional isotropic harmonic oscillator we
describe the geometric properties of the polarization ellipse
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:29:46 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Mota",
"R. D.",
""
],
[
"Xicotencatl",
"M. A.",
""
],
[
"Granados",
"V. D.",
""
]
] | [
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] |
801.4745 | Bhimsen Shivamoggi | Bhimsen K. Shivamoggi | Parker Problem in Hall Magnetohydrodynamics | null | null | 10.1063/1.3140055 | null | physics.space-ph | null | Parker problem in Hall magnetohydrodynamics (MHD) is considered. Poloidal
shear into the toroidal flow generated by the Hall effect is incorporated. This
is found to lead to a {\it triple deck} structure for the Parker problem in
Hall MHD, with the magnetic field falling off in the intermediate
Hall-resistive region more steeply (like \normalfont $1/x^3$) than that (like
\normalfont$1/x$) in the outer ideal MHD region.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:29:52 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Shivamoggi",
"Bhimsen K.",
""
]
] | [
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] |
801.4746 | W Saba | Walid S. Saba | Concerning Olga, the Beautiful Little Street Dancer (Adjectives as
Higher-Order Polymorphic Functions) | 6 pages | null | null | null | cs.CL cs.LO | null | In this paper we suggest a typed compositional seman-tics for nominal
compounds of the form [Adj Noun] that models adjectives as higher-order
polymorphic functions, and where types are assumed to represent concepts in an
ontology that reflects our commonsense view of the world and the way we talk
about it in or-dinary language. In addition to [Adj Noun] compounds our
proposal seems also to suggest a plausible explana-tion for well known
adjective ordering restrictions.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:40:45 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 17:10:22 GMT"
},
{
"version": "v3",
"created": "Fri, 1 Feb 2008 01:34:55 GMT"
},
{
"version": "v4",
"created": "Mon, 4 Feb 2008 22:36:04 GMT"
},
{
"version": "v5",
"created": "Sun, 10 Feb 2008 08:26:02 GMT"
}
] | 2008-02-10T00:00:00 | [
[
"Saba",
"Walid S.",
""
]
] | [
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] |
801.4747 | Marc Arnold Nieper-Wi{\ss}kirchen | Daniel Huybrechts, Marc Nieper-Wisskirchen | Remarks on derived equivalences of Ricci-flat manifolds | 25 pages | null | null | null | math.AG | null | We present results indicating that the decomposition of a Ricci-flat manifold
in its irreducible factors is reflected by the derived category of coherent
sheaves. More precisely, we prove that a smooth projective variety that is
derived equivalent to an abelian variety resp. an irreducible symplectic
variety is of the same type.
The paper also contains a proof of a conjecure of Caldararu for manifolds
with trivial canonical bundle saying that the modified HKR isomorphism for
Hochschild homology is compatible with the module structure.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:53:41 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Huybrechts",
"Daniel",
""
],
[
"Nieper-Wisskirchen",
"Marc",
""
]
] | [
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] |
801.4748 | Erik Hemsing | Erik Hemsing, Avraham Gover and James Rosenzweig | Virtual dielectric waveguide mode description of a high-gain
free-electron laser I: Theory | 14 pages | null | 10.1103/PhysRevA.77.063830 | null | physics.optics | null | A set of mode-coupled excitation equations for the slowly-growing amplitudes
of dielectric waveguide eigenmodes is derived as a description of the
electromagnetic signal field of a high-gain free-electron laser, or FEL,
including the effects of longitudinal space-charge. This approach of describing
the field basis set has notable advantages for FEL analysis in providing an
efficient characterization of eigenmodes, and in allowing a clear connection to
free-space propagation of the input (seeding) and output radiation. The
formulation describes the entire evolution of the radiation wave through the
linear gain regime, prior to the onset of saturation, with arbitrary initial
conditions. By virtue of the flexibility in the expansion basis, this technique
can be used to find the direct coupling and amplification of a particular mode.
A simple transformation converts the derived coupled differential excitation
equations into a set of coupled algebraic equations and yields a matrix
determinant equation for the FEL eigenmodes. A quadratic index medium is used
as a model dielectric waveguide to obtain an expression for the predicted spot
size of the dominant system eigenmode, in the approximation that it is a single
gaussian mode.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:45:18 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 00:24:09 GMT"
},
{
"version": "v3",
"created": "Tue, 29 Apr 2008 00:37:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hemsing",
"Erik",
""
],
[
"Gover",
"Avraham",
""
],
[
"Rosenzweig",
"James",
""
]
] | [
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] |
801.4749 | Judith Racusin | J. L. Racusin (1), E.-W. Liang (2,3), D. N. Burrows (1), D. C. Morris
(1), B. B. Zhang (2), B. Zhang (2) ((1) Pennsylvania State University, (2)
University of Nevada, Las Vegas, (3) Guangxi University) | Swift X-ray Afterglows and the Missing Jet Break Problem | 4 pages, 4 figures, contributed talk, submitted to the proceedings of
Gamma Ray Bursts 2007, Santa Fe, New Mexico, November 5-9 2007 | AIP Conf.Proc.1000:196-199,2008 | 10.1063/1.2943442 | null | astro-ph | null | We present a systematic survey of the temporal and spectral properties of all
GRB X-ray afterglows observed by Swift-XRT between January 2005 and July 2007.
We have constructed a catalog of all light curves and spectra and investigate
the physical origin of each afterglow segment in the framework of the forward
shock models by comparing the data with the closure relations. We search for
possible jet-like breaks in the lightcurves and try to explain some of the
"missing" X-ray jet breaks in the lightcurves.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:48:37 GMT"
}
] | 2010-03-19T00:00:00 | [
[
"Racusin",
"J. L.",
""
],
[
"Liang",
"E. -W.",
""
],
[
"Burrows",
"D. N.",
""
],
[
"Morris",
"D. C.",
""
],
[
"Zhang",
"B. B.",
""
],
[
"Zhang",
"B.",
""
]
] | [
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] |
801.475 | Maxime Gariel | Maxime Gariel, Eric Feron | Graceful Degradation of Air Traffic Operations | null | null | null | null | cs.OH | null | The introduction of new technologies and concepts of operation in the air
transportation system is not possible, unless they can be proven not to
adversely affect the system operation under not only nominal, but also degraded
conditions. In extreme scenarios, degraded operations due to partial or
complete technological failures should never endanger system safety. Many past
system evolutions, whether ground-based or airborne, have been based on
trial-and-error, and system safety was addressed only after a specific event
yielded dramatic or near- dramatic consequences. Future system evolutions,
however, must leverage available computation, prior knowledge and abstract
reasoning to anticipate all possible system degradations and prove that such
degradations are graceful and safe. This paper is concerned with the graceful
degradation of high-density, structured arrival traffic against partial or
complete surveillance failures. It is shown that for equal performance
requirements, some traffic configurations might be easier to handle than
others, thereby offering a quantitative perspective on these traffic
configurations. ability to "gracefully degrade". To support our work, we also
introduce a new conflict resolution algorithm, aimed at solving conflicts
involving many aircraft when aircraft position information is in the process of
degrading.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:50:44 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Gariel",
"Maxime",
""
],
[
"Feron",
"Eric",
""
]
] | [
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] |
801.4751 | Francisco Virgili | Francisco Virgili, Enwei Liang, Bing Zhang | Low-Luminosity Gamma-Ray Bursts as a Distinct GRB Population:A Firmer
Case from Multiple Criteria Constraints | 22 pages, 9 figures, 3 tables; MNRAS, in press; Updated analysis and
figures | null | 10.1111/j.1365-2966.2008.14063.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The intriguing observations of Swift/BAT X-ray flash XRF 060218 and the
BATSE-BeppoSAX gamma-ray burst GRB 980425, both with much lower luminosity and
redshift compared to other observed bursts, naturally lead to the question of
how these low-luminosity (LL) bursts are related to high-luminosity (HL)
bursts. Incorporating the constraints from both the flux-limited samples
observed with CGRO/BATSE and Swift/BAT and the redshift-known GRB sample, we
investigate the luminosity function for both LL- and HL-GRBs through
simulations. Our multiple criteria, including the log N - log P distributions
from the flux-limited GRB sample, the redshift and luminosity distributions of
the redshift-known sample, and the detection ratio of HL- and LL- GRBs with
Swift/BAT, provide a set of stringent constraints to the luminosity function.
Assuming that the GRB rate follows the star formation rate, our simulations
show that a simple power law or a broken power law model of luminosity function
fail to reproduce the observations, and a new component is required. This
component can be modeled with a broken power, which is characterized by a sharp
increase of the burst number at around L < 10^47 erg s^-1}. The lack of
detection of moderate-luminosity GRBs at redshift ~0.3 indicates that this
feature is not due to observational biases. The inferred local rate, rho_0, of
LL-GRBs from our model is ~ 200 Gpc^-3 yr^-1 at ~ 10^47 erg s^-1, much larger
than that of HL-GRBs. These results imply that LL-GRBs could be a separate GRB
population from HL-GRBs. The recent discovery of a local X-ray transient
080109/SN 2008D would strengthen our conclusion, if the observed non-thermal
emission has a similar origin as the prompt emission of most GRBs and XRFs.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:00:30 GMT"
},
{
"version": "v2",
"created": "Sat, 11 Oct 2008 08:05:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Virgili",
"Francisco",
""
],
[
"Liang",
"Enwei",
""
],
[
"Zhang",
"Bing",
""
]
] | [
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] |
801.4752 | William Danchi | W.C. Danchi, D. Deming, K. G. Carpenter, R. K. Barry, P. Hinz, K. J.
Johnston, P. Lawson, O. Lay, J. D. Monnier, L. J. Richardson, S. Rinehart, W.
Traub | Towards a Small Prototype Planet Finding Interferometer: The next step
in planet finding and characterization in the infrared | 8 pages, 4 figures, white paper for Exoplanet Task Force, March 2007 | null | null | null | astro-ph | null | During the last few years, considerable effort has been directed towards
large-scale (>> $1 Billion US) missions to detect and characterize earth-like
planets around nearby stars, such as the Terrestrial Planet Finder
Interferometer (TPF-I) and Darwin missions. However, technological and
budgetary issues as well as shifting science priorities will likely prevent
these missions from entering Phase A until the next decade. The secondary
eclipse technique using the Spitzer Space Telescope has been used to directly
measure the temperature and emission spectrum of extrasolar planets. However,
only a small fraction of known extrasolar planets are in transiting orbits.
Thus, a simplified nulling interferometer, which produces an artificial eclipse
or occultation, and operates in the near- to mid-infrared (e.g. ~ 3 to 8 or 10
microns), can characterize the atmospheres of this much larger sample of the
known but non-transiting exoplanets. Many other scientific problems can be
addressed with a system like this, including imaging debris disks, active
galactic nuclei, and low mass companions around nearby stars. We discuss the
rationale for a probe-scale mission in the $600-800 Million range, which we
name here as the Small Prototype Planet Finding Interferometer (SPPFI).
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:04:56 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Danchi",
"W. C.",
""
],
[
"Deming",
"D.",
""
],
[
"Carpenter",
"K. G.",
""
],
[
"Barry",
"R. K.",
""
],
[
"Hinz",
"P.",
""
],
[
"Johnston",
"K. J.",
""
],
[
"Lawson",
"P.",
""
],
[
"Lay",
"O.",
""
],
[
"Monnier",
"J. D.",
""
],
[
"Richardson",
"L. J.",
""
],
[
"Rinehart",
"S.",
""
],
[
"Traub",
"W.",
""
]
] | [
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] |
801.4753 | Jie Xiao | Jie Xiao | Toward Best Isoperimetric Constants for $(H^1,BMO)$-Normal Conformal
Metrics on $\mathbb R^n$, $n\ge 3$ | 17 pages | null | null | null | math.DG math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this article is: (a) To establish the existence of the best
isoperimetric constants for the $(H^1,BMO)$-normal conformal metrics
$e^{2u}|dx|^2$ on $\mathbb R^n$, $n\ge 3$, i.e., the conformal metrics with the
Q-curvature orientated conditions $$ (-\Delta)^{n/2}u\in H^1(\mathbb R^n) & \
u(x)=\hbox{const.}+\frac{\int_{\mathbb
R^n}(\log\frac{|\cdot|}{|x-\cdot|})(-\Delta)^{n/2} u(\cdot)
d\mathcal{H}^n(\cdot)}{2^{n-1}\pi^{n/2}\Gamma(n/2)}; $$ (b) To prove that
$(n\omega_n^\frac1n)^\frac{n}{n-1}$ is the optimal upper bound of the best
isoperimetric constants for the complete $(H^1,BMO)$-normal conformal metrics
with nonnegative scalar curvature; (c) To find the optimal upper bound of the
best isoperimetric constants via the quotients of two power integrals of
Green's functions for the $n$-Laplacian operators $-\hbox{div}(|\nabla
u|^{n-2}\nabla u)$.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:22:32 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 19:57:27 GMT"
},
{
"version": "v3",
"created": "Wed, 2 Apr 2008 18:02:10 GMT"
},
{
"version": "v4",
"created": "Thu, 3 Apr 2008 11:16:09 GMT"
},
{
"version": "v5",
"created": "Thu, 24 Apr 2008 20:18:41 GMT"
},
{
"version": "v6",
"created": "Tue, 12 Aug 2008 18:54:30 GMT"
}
] | 2008-08-12T00:00:00 | [
[
"Xiao",
"Jie",
""
]
] | [
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801.4754 | Constanza Riera | Constanza Riera, Stephane Jacob and Matthew G. Parker | From Graph States to Two-Graph States | null | null | null | null | quant-ph | null | The name graph state is used to describe a certain class of pure quantum
state which models a physical structure on which one can perform
measurement-based quantum computing, and which has a natural graphical
description. We present the two-graph state, this being a generalisation of the
graph state and a two-graph representation of a stabilizer state.
Mathematically, the two-graph state can be viewed as a simultaneous
generalisation of a binary linear code and quadratic Boolean function. It
describes precisely the coefficients of the pure quantum state vector resulting
from the action of a member of the local Clifford group on a graph state, and
comprises a graph which encodes the magnitude properties of the state, and a
graph encoding its phase properties. This description facilitates a
computationally efficient spectral analysis of the graph state with respect to
operations from the local Clifford group on the state, as all operations can be
realised graphically. By focusing on the so-called local transform group, which
is a size 3 cyclic subgroup of the local Clifford group over one qubit, and
over $n$ qubits is of size $3^n$, we can efficiently compute spectral
properties of the graph state.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:27:04 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Riera",
"Constanza",
""
],
[
"Jacob",
"Stephane",
""
],
[
"Parker",
"Matthew G.",
""
]
] | [
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] |
801.4755 | Susan Welby | Paul T. Kondratko, Lincoln J. Greenhill, and James M. Moran | The Parsec-scale Accretion Disk in NGC 3393 | 22 pages and 4 figures (2 of these figures contain 2 eps files)
accepted by the Astrophysical Journal | null | 10.1086/586879 | null | astro-ph | null | We present a Very Long Baseline Interferometry image of the water maser
emission in the nuclear region of NGC3393. The maser emission has a linear
distribution oriented at a position angle of $\sim -34\degr$, perpendicular to
both the kpc-scale radio jet and the axis of the narrow line region. The
position-velocity diagram displays a red-blue asymmetry about the systemic
velocity and the estimated dynamical center, and is thus consistent with
rotation. Assuming Keplerian rotation in an edge-on disk, we obtain an enclosed
mass of $(3.1\pm 0.2) \times 10^7 M_{\sun}$ within $0.36\pm 0.02$ pc ($1.48\pm
0.06$ mas), which corresponds to a mean mass density of $\sim10^{8.2} M_{\sun}$
pc$^{-3}$. We also report the measurement with the Green Bank Telescope of a
velocity drift, a manifestation of centripetal acceleration within the disk, of
$5\pm 1$ km s $^{-1}$ yr$^{-1}$ in the $\sim3880$ km s$^{-1}$ maser feature,
which is most likely located along the line of sight to the dynamical center of
the system. From the acceleration of this feature, we estimate a disk radius of
$0.17\pm 0.02$ pc, which is smaller than the inner disk radius ($0.36\pm 0.02$
pc) of emission that occurs along the midline (i.e., the line of nodes). The
emission along the line of sight to the dynamical center evidently occurs much
closer to the center than the emission from the disk midline, contrary to the
situation in the archetypal maser systems NGC4258 and NGC1068. The outer radius
of the disk as traced by the masers along the midline is about 1.5 pc.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:45:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kondratko",
"Paul T.",
""
],
[
"Greenhill",
"Lincoln J.",
""
],
[
"Moran",
"James M.",
""
]
] | [
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] |
801.4756 | Masha Vladimirova | M. Vladimirova, S. Cronenberger, P. Barate, D. Scalbert, F. J. Teran,
A. P. Dmitriev | Two kinds of spin precession modes in diluted magnetic semiconductors | null | null | null | null | cond-mat.other | null | Time-resolved Kerr rotation experiments show that two kinds of spin modes
exist in diluted magnetic semiconductors: (i) coupled electron-magnetic ion
spin excitations and (ii) excitations of magnetic ion spin subsystem, which are
decoupled from electron spins. The latter modes exhibit much longer spin
coherence time and require a description, which goes beyond the mean field
approximation.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:51:19 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 21:08:52 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Vladimirova",
"M.",
""
],
[
"Cronenberger",
"S.",
""
],
[
"Barate",
"P.",
""
],
[
"Scalbert",
"D.",
""
],
[
"Teran",
"F. J.",
""
],
[
"Dmitriev",
"A. P.",
""
]
] | [
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] |
801.4757 | R. E. Kastner | R. E. Kastner | On Visibility in the Afshar Two-Slit Experiment | Final version; to appear in Foundations of Physics | null | 10.1007/s10701-009-9329-2 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A modified version of Young's experiment by Shahriar Afshar indirectly
reveals the presence of a fully articulated interference pattern prior to the
post-selection of a particle in a "which-slit" basis. While this experiment
does not constitute a violation of Bohr's Complementarity Principle as claimed
by Afshar, both he and many of his critics incorrectly assume that a commonly
used relationship between visibility parameter V and "which-way" parameter K
has crucial relevance to his experiment. It is argued here that this
relationship does not apply to this experimental situation and that it is wrong
to make any use of it in support of claims for or against the bearing of this
experiment on Complementarity.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:54:46 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 06:18:37 GMT"
},
{
"version": "v3",
"created": "Mon, 27 Jul 2009 16:21:32 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kastner",
"R. E.",
""
]
] | [
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] |
801.4758 | Jessica Werk | J. K. Werk (1), M. E. Putman (1), G. R. Meurer (2), M. S. Oey (1), E.
V. Ryan-Weber (3), R. C. Kennicutt Jr. (3), and K. C. Freeman (4) ((1)
University of Michigan (2) The Johns Hopkins University (3) Institute of
Astronomy (4) Australian National University) | Isolated OB Associations in Stripped HI Gas Clouds | 21 pages, 9 figures, 6 tables; accepted for publication in ApJ | null | 10.1086/533523 | null | astro-ph | null | HST ACS/HRC images in UV (F250W), V (F555W), and I (F814W) resolve three
isolated OB associations that lie up to 30 kpc from the stellar disk of the S0
galaxy NGC 1533. Previous narrow-band Halpha imaging and optical spectroscopy
showed these objects as unresolved intergalactic HII regions having Halpha
luminosities consistent with single early-type O stars. These young stars lie
in stripped HI gas with column densities ranging from 1.5 - 2.5 * 10^20 cm^-2
and velocity dispersions near 30 km s^-1. Using the HST broadband colors and
magnitudes along with previously-determined Halpha luminosities, we place
limits on the masses and ages of each association, considering the importance
of stochastic effects for faint (M_V >-8) stellar populations. The upper limits
to their stellar masses range from 600 M_sun to 7000 M_sun, and ages range from
2 - 6 Myrs. This analysis includes an updated calculation of the conversion
factor between the ionizing luminosity and the total number of main sequence O
stars contained within an HII region. The photometric properties and sizes of
the isolated associations and other objects in the HRC fields are consistent
with those of Galactic stellar associations, open clusters and/or single O and
B stars. We interpret the age-size sequence of associations and clustered field
objects as an indication that these isolated associations are most likely
rapidly dispersing. Furthermore, we consider the possibility that these
isolated associations represent the first generation of stars in the HI ring
surrounding NGC 1533. This work suggests star formation in the unique
environment of a galaxy's outermost gaseous regions proceeds similarly to that
within the Galactic disk and that star formation in tidal debris may be
responsible for building up a younger halo component.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:00:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Werk",
"J. K.",
""
],
[
"Putman",
"M. E.",
""
],
[
"Meurer",
"G. R.",
""
],
[
"Oey",
"M. S.",
""
],
[
"Ryan-Weber",
"E. V.",
""
],
[
"Kennicutt",
"R. C.",
"Jr."
],
[
"Freeman",
"K. C.",
""
]
] | [
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801.4759 | Gabriele Ghisellini | M. Nardini (1), G. Ghisellini (2), G. Ghirlanda (2) ((1) SISSA,
Trieste, Italy, (2) INAF - Osserv. Astron. di Brera, Italy) | Optical afterglow luminosities in the Swift epoch: confirming clustering
and bimodality | 5 pages 3 figures, minor revision, added reference, accepted for
publication in MNRAS Letters | null | 10.1111/j.1745-3933.2008.00467.x | null | astro-ph | null | We show that Gamma Ray Bursts (GRBs) of known redshift and rest frame optical
extinction detected by the Swift satellite fully confirm earlier results
concerning the distribution of the optical afterglow luminosity at 12 hours
after trigger (rest frame time). This distribution is bimodal and relatively
narrow, especially for the high luminosity branch. This is intriguing, given
that Swift GRBs have, on average, a redshift larger than pre-Swift ones, and is
unexpected in the common scenario explaining the GRB afterglow. We investigate
if the observed distribution can be the result of selection effects affecting a
unimodal parent luminosity distribution, and find that either the distribution
is intrinsically bimodal, or most (60 per cent) of the bursts are absorbed by a
substantial amount of grey dust. In both cases we suggest that most dark bursts
should belong to the underluminous optical family.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:00:11 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Feb 2008 13:06:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nardini",
"M.",
""
],
[
"Ghisellini",
"G.",
""
],
[
"Ghirlanda",
"G.",
""
]
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] |
801.476 | Ernesto Lupercio | Maxim Kontsevich | XI Solomon Lefschetz Memorial Lecture Series: Hodge structures in
non-commutative geometry. (Notes by Ernesto Lupercio) | Lecture notes for the Solomon Lefschetz Memorial Lecture Series,
September 8-9, 2005 by Maxim Kontsevich at Cinvestav, Mexico. Notes by
Ernesto Lupercio. http://www.math.cinvestav.mx/KontsevichEnglish.htm. To
appear in Contemporary Mathematics | null | null | null | math.AG math-ph math.KT math.MP | null | Traditionally, Hodge structures are associated with complex projective
varieties. In my expository lectures I discussed a non-commutative
generalization of Hodge structures in deformation quantization and in derived
algebraic geometry.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:00:24 GMT"
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] | 2008-02-01T00:00:00 | [
[
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"Maxim",
""
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] |
801.4761 | Carles Badenes | Carles Badenes, John P. Hughes, Gamil Cassam-Chenai, and Eduardo Bravo | The Persistence of Memory, or How the X-Ray Spectrum of SNR 0509-67.5
Reveals the Brightness of its Parent Type Ia Supernova | 10 pages, 9 figures, plus an exclusive astro-ph-only Appendix; ApJ in
press, companion paper to Rest et al. 08 | null | 10.1086/524700 | null | astro-ph | null | We examine the dynamics and X-ray spectrum of the young Type Ia supernova
remnant 0509-67.5 in the context of the recent results obtained from the
optical spectroscopy of its light echo. Our goal is to estimate the kinetic
energy of the supernova explosion using Chandra and XMM-Newton observations of
the supernova remnant, thus placing the birth event of 0509-67.5 in the
sequence of dim to bright Type Ia supernovae. We base our analysis on a
standard grid of one-dimensional delayed detonation explosion models, together
with hydrodynamic and X-ray spectral calculations of the supernova remnant
evolution. From the remnant dynamics and the properties of the O, Si, S, and Fe
emission in its X-ray spectrum we conclude that 0509-67.5 was originated ~400
years ago by a bright, highly energetic Type Ia explosion similar to SN 1991T.
Our best model has a kinetic energy of 1.4x10E51 erg and synthesizes 0.97 Msun
of 56Ni. These results are in excellent agreement with the age estimate and
spectroscopy from the light echo. We have thus established the first connection
between a Type Ia supernova and its supernova remnant based on a detailed
quantitative analysis of both objects.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:01:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Badenes",
"Carles",
""
],
[
"Hughes",
"John P.",
""
],
[
"Cassam-Chenai",
"Gamil",
""
],
[
"Bravo",
"Eduardo",
""
]
] | [
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] |
801.4762 | Armin Rest | A. Rest, T. Matheson, S. Blondin, M. Bergmann, D. L. Welch, N. B.
Suntzeff, R. C. Smith, K. Olsen, J. L. Prieto, A. Garg, P. Challis, C.
Stubbs, M. Hicken, M. Modjaz, W. M. Wood-Vasey, A. Zenteno, G. Damke, A.
Newman, M. Huber, K. H. Cook, S. Nikolaev, A. C. Becker, A. Miceli, R.
Covarrubias, L. Morelli, G. Pignata, A. Clocchiatti, D. Minniti, and R. J.
Foley | Spectral Identification of an Ancient Supernova using Light Echoes in
the LMC | 12 pages, 18 Figures, to be published in ApJ | null | 10.1086/587158 | null | astro-ph | null | We report the successful identification of the type of the supernova
responsible for the supernova remnant SNR 0509-675 in the Large Magellanic
Cloud (LMC) using Gemini spectra of surrounding light echoes. The ability to
classify outbursts associated with centuries-old remnants provides a new window
into several aspects of supernova research and is likely to be successful in
providing new constraints on additional LMC supernovae as well as their
historical counterparts in the Milky Way Galaxy (MWG). The combined spectrum of
echo light from SNR 0509-675 shows broad emission and absorption lines
consistent with a supernova (SN) spectrum. We create a spectral library
consisting of 26 SNe Ia and 6 SN Ib/c that are time-integrated, dust-scattered
by LMC dust, and reddened by the LMC and MWG. We fit these SN templates to the
observed light echo spectrum using $\chi^2$ minimization as well as correlation
techniques, and we find that overluminous 91T-like SNe Ia with $\dm15<0.9$
match the observed spectrum best.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:02:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rest",
"A.",
""
],
[
"Matheson",
"T.",
""
],
[
"Blondin",
"S.",
""
],
[
"Bergmann",
"M.",
""
],
[
"Welch",
"D. L.",
""
],
[
"Suntzeff",
"N. B.",
""
],
[
"Smith",
"R. C.",
""
],
[
"Olsen",
"K.",
""
],
[
"Prieto",
"J. L.",
""
],
[
"Garg",
"A.",
""
],
[
"Challis",
"P.",
""
],
[
"Stubbs",
"C.",
""
],
[
"Hicken",
"M.",
""
],
[
"Modjaz",
"M.",
""
],
[
"Wood-Vasey",
"W. M.",
""
],
[
"Zenteno",
"A.",
""
],
[
"Damke",
"G.",
""
],
[
"Newman",
"A.",
""
],
[
"Huber",
"M.",
""
],
[
"Cook",
"K. H.",
""
],
[
"Nikolaev",
"S.",
""
],
[
"Becker",
"A. C.",
""
],
[
"Miceli",
"A.",
""
],
[
"Covarrubias",
"R.",
""
],
[
"Morelli",
"L.",
""
],
[
"Pignata",
"G.",
""
],
[
"Clocchiatti",
"A.",
""
],
[
"Minniti",
"D.",
""
],
[
"Foley",
"R. J.",
""
]
] | [
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0.0418207534,
0.0105103608,
0.030096598,
-0.0296000447,
-0.0735449418,
-0.013827607,
0.0713380352,
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] |
801.4763 | Meredith Hughes | A. M. Hughes, D. J. Wilner, C. Qi, M. R. Hogerheijde | Gas and Dust Emission at the Outer Edge of Protoplanetary Disks | 9 pages, 2 figures, accepted for publication in ApJ | null | 10.1086/586730 | null | astro-ph | null | We investigate the apparent discrepancy between gas and dust outer radii
derived from millimeter observations of protoplanetary disks. Using 230 and 345
GHz continuum and CO J=3-2 data from the Submillimeter Array for four nearby
disk systems (HD 163296, TW Hydrae, GM Aurigae, and MWC 480), we examine models
of circumstellar disk structure and the effects of their treatment of the outer
disk edge. We show that for these disks, models described by power laws in
surface density and temperature that are truncated at an outer radius are
incapable of reproducing both the gas and dust emission simultaneously: the
outer radius derived from the dust continuum emission is always significantly
smaller than the extent of the molecular gas disk traced by CO emission.
However, a simple model motivated by similarity solutions of the time evolution
of accretion disks that includes a tapered exponential edge in the surface
density distribution (and the same number of free parameters) does much better
at reproducing both the gas and dust emission. While this analysis does not
rule out the disparate radii implied by the truncated power-law models, a
realistic alternative disk model, grounded in the physics of accretion,
provides a consistent picture for the extent of both the gas and dust.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:06:48 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 16:47:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hughes",
"A. M.",
""
],
[
"Wilner",
"D. J.",
""
],
[
"Qi",
"C.",
""
],
[
"Hogerheijde",
"M. R.",
""
]
] | [
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] |
801.4764 | Robert Feldmann | R. Feldmann, L. Mayer, C. M. Carollo | Tidal debris in elliptical galaxies as tracers of mergers with disks | 14 pages, 10 figures, 4 tables. Accepted to APJ. Minor changes to
match published version | null | 10.1086/590235 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a set of high-resolution N-body simulations of binary galaxy mergers
to show that the morphologies of the tidal features that are seen around a
large fraction of nearby, massive ellipticals in the field, cannot be
reproduced by equal-mass dissipationless mergers; rather, they are well
explained by the accretion of disk-dominated galaxies. In particular, the arm-
and looplike morphologies of the observed tidal debris can only be produced by
the kinematically cold material of the disk components of the accreted
galaxies. The tidal features that arise from such "cold-accretion" events onto
a massive elliptical are visible for significantly longer timescales than the
features produced by elliptical-elliptical mergers (about 1-2 Gyr vs. a few
hundred million years). Mass ratios of the order of 1:10 between the accreting
elliptical and the accreted disk are sufficient to match the brightness of the
observed debris. Furthermore, stellar population synthesis models and simple
order-of-magnitude calculations indicate that the colors of the tidal features
generated in such minor cold-accretion events are relatively red, in agreement
with the observations. The minor cold-accretion events that explain the
presence, brightness, and structural and color properties of the tidal debris
cause only a modest mass and luminosity increase in the accreting massive
elliptical. These results, coupled with the relative statistical frequencies of
disk- and bulge-dominated galaxies in the field, suggest that massive
ellipticals assemble most of their mass well before their tidal debris forms
through the accretion of relatively little, kinematically cold material rather
than in very recent, dissipationless major mergers.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:08:17 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Aug 2008 17:43:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Feldmann",
"R.",
""
],
[
"Mayer",
"L.",
""
],
[
"Carollo",
"C. M.",
""
]
] | [
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801.4765 | Dmitry Novikov | D. S. Novikov (Yale) and V. G. Kiselev (Freiburg) | Transverse NMR relaxation in magnetically heterogeneous media | 9 pages, 4 figures | J. Magn. Reson. 195, 33 (2008) | 10.1016/j.jmr.2008.08.005 | null | cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the NMR signal from a permeable medium with a heterogeneous
Larmor frequency component that varies on a scale comparable to the
spin-carrier diffusion length. We focus on the mesoscopic part of the
transverse relaxation, that occurs due to dispersion of precession phases of
spins accumulated during diffusive motion. By relating the spectral lineshape
to correlation functions of the spatially varying Larmor frequency, we
demonstrate how the correlation length and the variance of the Larmor frequency
distribution can be determined from the NMR spectrum. We corroborate our
results by numerical simulations, and apply them to quantify human blood
spectra.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:09:46 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Oct 2008 04:16:13 GMT"
}
] | 2008-10-23T00:00:00 | [
[
"Novikov",
"D. S.",
"",
"Yale"
],
[
"Kiselev",
"V. G.",
"",
"Freiburg"
]
] | [
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] |
801.4766 | Lode Wylleman | Lode Wylleman | A Petrov type I and generically asymmetric rotating dust family | 7 pages, irrotational limit case added, several minor errors
corrected | Class.Quant.Grav.25:172001,2008 | 10.1088/0264-9381/25/17/172001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general line element corresponding to the family of algebraically
general, gravito-electric, expanding, rotating dust models with one
functionally independent zero-order Riemann invariant is constructed. The
isometry group is at most one-dimensional but generically trivial. It is shown
that the asymmetric solutions with constant ratio of energy density and
vorticity amplitude provide first examples of Petrov type I space-times for
which the Karlhede classification requires the computation of the third
covariant derivative of the Riemann tensor.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:13:40 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jun 2008 21:11:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wylleman",
"Lode",
""
]
] | [
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] |
801.4767 | William Kung | William Kung, M. Cristina Marchetti | Mode-Locking in Driven Disordered Systems as a Boundary-Value Problem | 6 pages, 7 figures, RevTeX, Submitted | null | 10.1007/s10955-008-9573-4 | null | cond-mat.stat-mech cond-mat.dis-nn | null | We study mode-locking in disordered media as a boundary-value problem.
Focusing on the simplest class of mode-locking models which consists of a
single driven overdamped degree-of-freedom, we develop an analytical method to
obtain the shape of the Arnol'd tongues in the regime of low ac-driving
amplitude or high ac-driving frequency. The method is exact for a scalloped
pinning potential and easily adapted to other pinning potentials. It is
complementary to the analysis based on the well-known Shapiro's argument that
holds in the perturbative regime of large driving amplitudes or low driving
frequency, where the effect of pinning is weak.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:33:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kung",
"William",
""
],
[
"Marchetti",
"M. Cristina",
""
]
] | [
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] |
801.4768 | Eric Murphy | E.J. Murphy, G. Helou, J.D.P. Kenney, L. Armus, and R. Braun | Connecting Far-Infrared and Radio Morphologies of Disk Galaxies:
Cosmic-Ray Electron Diffusion After Star Formation Episodes | 23 pages, 12 figures, accepted for publication in ApJ. Figure
resolution slightly decreased | null | 10.1086/587123 | null | astro-ph | null | We present results on the interstellar medium (ISM) properties of 29 galaxies
based on a comparison of {\it Spitzer} far-infrared and Westerbork Synthesis
Radio Telescope radio continuum imagery. Of these 29 galaxies, 18 are close
enough to resolve at $\la$1 kpc scales at 70 $\micron$ and 22 cm. We extend the
\citet{ejm06a,ejm06b} approach of smoothing infrared images to approximate
cosmic-ray (CR) electron spreading and thus largely reproduce the appearance of
radio images. Using a wavelet analysis we decompose each 70 $\micron$ image
into one component containing the star-forming {\it structures} and a second
one for the diffuse {\it disk}. The components are smoothed separately, and
their combination compared to a free-free corrected 22 cm radio image; the
scale-lengths are then varied to best match the radio and smoothed infrared
images. We find that late-type spirals having high amounts of ongoing star
formation benefit most from the two-component method. We also find that the
disk component dominates for galaxies having low star formation activity,
whereas the structure component dominates at high star formation activity. We
propose that this result arises from an age effect rather than from differences
in CR electron diffusion due to varying ISM parameters. The bulk of the CR
electron population in actively star-forming galaxies is significantly younger
than that in less active galaxies due to recent episodes of enhanced star
formation; these galaxies are observed within $\sim10^{8}$ yr since the onset
of the most recent star formation episode. The sample irregulars have
anomalously low best-fit scale-lengths for their surface brightnesses compared
to the rest of the sample spirals which we attribute to enhanced CR electron
escape.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:20:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Murphy",
"E. J.",
""
],
[
"Helou",
"G.",
""
],
[
"Kenney",
"J. D. P.",
""
],
[
"Armus",
"L.",
""
],
[
"Braun",
"R.",
""
]
] | [
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801.4769 | Bjorn Emonts | Bjorn Emonts (1), Raffaella Morganti (2,3), Tom Oosterloo (2,3),
Jacqueline van Gorkom (1)((1) Columbia Univ., USA, (2) ASTRON, NL, (3)
Kapteyn Astronomical Inst., NL) | Cold gas & mergers: fundamental difference in HI properties of different
types of radio galaxies? | 5 pages, 3 figures - to appear in PoS, "The Modern Radio Universe:
From Planets to Dark Energy Conference", Manchester UK, eds: Beswick, Diamond
& Schilizzi | null | null | null | astro-ph | null | We present results of a study of large-scale neutral hydrogen (HI) gas in
nearby radio galaxies. We find that the early-type host galaxies of different
types of radio sources (compact, FR-I and FR-II) appear to contain
fundamentally different large-scale HI properties: enormous regular rotating
disks and rings are present around the host galaxies of a significant fraction
of low power compact radio sources, while no large-scale HI is detected in low
power, edge-darkened FR-I radio galaxies. Preliminary results of a study of
nearby powerful, edge-brightened FR-II radio galaxies show that these systems
generally contain significant amounts of large-scale HI, often distributed in
tail- or bridge-like structures, indicative of a recent galaxy merger or
collision. Our results suggest that different types of radio galaxies may have
a different formation history, which could be related to a difference in the
triggering mechanism of the radio source. If confirmed by larger studies with
the next generation radio telescopes, this would be in agreement with previous
optical studies that suggest that powerful FR-II radio sources are likely
triggered by galaxy mergers and collisions, while the lower power FR-I sources
are fed in other ways (e.g. through the accretion of hot IGM). The giant HI
disks/rings associated with some compact sources could - at least in some cases
- be the relics of much more advanced mergers.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:43:52 GMT"
}
] | 2008-02-01T00:00:00 | [
[
"Emonts",
"Bjorn",
""
],
[
"Morganti",
"Raffaella",
""
],
[
"Oosterloo",
"Tom",
""
],
[
"van Gorkom",
"Jacqueline",
""
]
] | [
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801.477 | Arundhati Dasgupta | Arundhati Dasgupta | The gravitational path integral and trace of the diffeomorphisms | 20 pgs; | Gen.Rel.Grav.43:2237-2255,2011 | 10.1007/s10714-011-1179-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I give a resolution of the conformal mode divergence in the Euclidean
gravitational path-integral by isolating the trace of the diffeomorphisms and
its contribution to the Faddeev-Popov measure.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:28:50 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Aug 2008 19:51:18 GMT"
},
{
"version": "v3",
"created": "Tue, 2 Mar 2010 22:15:09 GMT"
}
] | 2011-07-21T00:00:00 | [
[
"Dasgupta",
"Arundhati",
""
]
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801.4771 | Gergely Szirmai | D. Nagy, G. Szirmai, P. Domokos | Self-organization of a Bose-Einstein condensate in an optical cavity | 11 pages, final version. Accepted for publication in EPJD | Eur. Phys. J. D 48, 127 (2008) | 10.1140/epjd/e2008-00074-6 | null | quant-ph cond-mat.other | null | The spatial self-organization of a Bose-Einstein condensate (BEC) in a
high-finesse linear optical cavity is discussed. The condensate atoms are
laser-driven from the side and scatter photons into the cavity. Above a
critical pump intensity the homogeneous condensate evolves into a stable
pattern bound by the cavity field. The transition point is determined
analytically from a mean-field theory. We calculate the lowest lying Bogoliubov
excitations of the coupled BEC-cavity system and the quantum depletion due to
the atom-field coupling.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:37:41 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 09:13:34 GMT"
}
] | 2008-05-29T00:00:00 | [
[
"Nagy",
"D.",
""
],
[
"Szirmai",
"G.",
""
],
[
"Domokos",
"P.",
""
]
] | [
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] |
801.4772 | Henrique R. Schmitt | H. R. Schmitt, T. A. Pauls, C. Tycner, J. T. Armstrong, R. T. Zavala,
J. A. Benson, G. C. Gilbreath, R. B. Hindsley, D. J. Hutter, K. J. Johnston,
A. M. Jorgensen, D. Mozurkewich | Navy Prototype Optical Interferometer Imaging of Line Emission Regions
of beta Lyrae Using Differential Phase Referencing | Submitted to ApJ | Astrophys.J.691:984-996,2009 | 10.1088/0004-637X/691/2/984 | null | astro-ph | null | We present the results of an experiment to image the interacting binary star
beta Lyrae with data from the Navy Prototype Optical Interferometer (NPOI),
using a differential phase technique to correct for the effects of the
instrument and atmosphere on the interferometer phases. We take advantage of
the fact that the visual primary of beta Lyrae and the visibility calibrator we
used are both nearly unresolved and nearly centrally symmetric, and
consequently have interferometric phases near zero. We used this property to
detect and correct for the effects of the instrument and atmosphere on the
phases of beta Lyrae and to obtain differential phases in the channel
containing the Halpha emission line. Combining the Halpha-channel phases with
information about the line strength, we recovered complex visibilities and
imaged the Halpha emission using standard radio interferometry methods. We find
that the results from our differential phase technique are consistent with
those obtained from a more-standard analysis using squared visibilities
(V^2's). Our images show the position of the Halpha emitting regions relative
to the continuum photocenter as a function of orbital phase and indicate that
the major axis of the orbit is oriented along p.a.=248.8+/-1.7 deg. The orbit
is smaller than previously predicted, a discrepancy that can be alleviated if
we assume that the system is at a larger distance from us, or that the
contribution of the stellar continuum to the Halpha channel is larger than
estimated. Finally, we also detected a differential phase signal in the
channels containing HeI emission lines at 587.6 and 706.5nm, with orbital
behavior different from that of the Halpha, indicating that it originates from
a different part of this interacting system.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 21:49:52 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Schmitt",
"H. R.",
""
],
[
"Pauls",
"T. A.",
""
],
[
"Tycner",
"C.",
""
],
[
"Armstrong",
"J. T.",
""
],
[
"Zavala",
"R. T.",
""
],
[
"Benson",
"J. A.",
""
],
[
"Gilbreath",
"G. C.",
""
],
[
"Hindsley",
"R. B.",
""
],
[
"Hutter",
"D. J.",
""
],
[
"Johnston",
"K. J.",
""
],
[
"Jorgensen",
"A. M.",
""
],
[
"Mozurkewich",
"D.",
""
]
] | [
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