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802.0703 | J\"org Dabringhausen | J. Dabringhausen, M. Hilker and P. Kroupa | From star clusters to dwarf galaxies: The properties of dynamically hot
stellar systems | 26 pages, 15 figures, accepted for publication in MNRAS. Minor
changes in the text and updates in the reference list in the replaced version | null | 10.1111/j.1365-2966.2008.13065.x | null | astro-ph | null | (Abridged) Objects with radii of 10 to 100 pc and masses in the range from
10^6 to 10^8 M_sun have been discovered during the past decade. These so-called
ultra compact dwarf galaxies (UCDs) constitute a transition between classical
star clusters and elliptical galaxies in terms of radii, relaxation times and
V-band mass-to-light (M/L_V) ratios. Using new data, we find that the mass
interval from 10^6 to 10^7 M_sun is of special interest, because within this
range typical half-light radii and dynamical mass-to-light ratios begin to
increase compared to globular clusters, the highest stellar densities are
reached and typical median two-body relaxation times surpass a Hubble time. The
M/L_V ratios of the UCDs turn out to be incompatible with the predictions from
simple stellar population (SSP) models when using the canonical stellar initial
mass function (IMF), although SSPs probably are good approximations to the real
stellar populations in UCDs and the SSP models allow to account for metallicity
effects on the M/L_V ratio. This provides evidence for the UCDs either having
formed with an IMF different from the canonical one or containing dark matter.
We emphasise that almost all pressure-supported stellar systems ranging from
star clusters to massive elliptical galaxies have M/L_V ratios less than 10
M_sun/L_sun, and that only dSph satellite galaxies have M/L_V ratios greater
than 100 M_sun/L_sun and therewith form exceptional systems.
| [
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},
{
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"created": "Tue, 1 Apr 2008 15:22:34 GMT"
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] | 2008-04-01T00:00:00 | [
[
"Dabringhausen",
"J.",
""
],
[
"Hilker",
"M.",
""
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""
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802.0704 | Dmytro Pesin | D. A. Pesin, A. V. Andreev, and B. Spivak | Conductance of d-wave superconductor/normal metal/d-wave superconductor
junctions | Published version: 4.5 pages, 1 figure, minor text changes,
references added | Phys. Rev. Lett. 100, 247004 (2008) | 10.1103/PhysRevLett.100.247004 | null | cond-mat.supr-con cond-mat.dis-nn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a theory of the conductance of superconductor/normal
metal/superconductor junctions in the case where the superconducting order
parameter has d-wave symmetry. At low temperature the conductance is
proportional to the square root of the inelastic electron relaxation time in
the bulk of the superconductor. As a result it turns out to be much larger than
the conductance of the normal part of the junction.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 21:00:31 GMT"
},
{
"version": "v2",
"created": "Sun, 22 Jun 2008 11:25:02 GMT"
}
] | 2012-07-19T00:00:00 | [
[
"Pesin",
"D. A.",
""
],
[
"Andreev",
"A. V.",
""
],
[
"Spivak",
"B.",
""
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802.0705 | Pietro De Poi | Pietro De Poi and Francesco Zucconi | Gonality, apolarity and hypercubics | 9 pages, to appear in the Bulletin of the London Mathematical Society | null | 10.1112/blms/bdr021 | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that any Fermat hypercubic is apolar to a trigonal curve, and vice
versa. We show also that the Waring number of the polar hypercubic associated
to a tetragonal curve of genus $g$ is at most $\lceil 3/2g - 7/2\rceil$, and
for a large class of them is at most $4/3g - 3$.
| [
{
"version": "v1",
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},
{
"version": "v2",
"created": "Fri, 30 May 2008 14:13:10 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Sep 2009 16:27:21 GMT"
},
{
"version": "v4",
"created": "Fri, 29 Apr 2011 16:54:36 GMT"
}
] | 2014-02-26T00:00:00 | [
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"Pietro",
""
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] |
802.0706 | Marcelo J. Reboucas | M.P. Lima, S. Vitenti, M.J. Reboucas | Energy conditions bounds and their confrontation with supernovae data | 7 pages, 3 figures. V2: Version to appear in Phys.Rev.D, analyses
extended to 1sigma, 2sigma and 3sigma confidence levels, references added,
minors changes | Phys.Rev.D77:083518,2008 | 10.1103/PhysRevD.77.083518 | null | astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The energy conditions play an important role in the understanding of several
properties of the Universe, including the current accelerating expansion phase
and the possible existence of the so-called phantom fields. We show that the
integrated bounds provided by the energy conditions on cosmological observables
such as the distance modulus $\mu(z)$ and the lookback time $t_L(z)$ are not
sufficient (nor necessary) to ensure the local fulfillment of the energy
conditions, making explicit the limitation of these bounds in the confrontation
with observational data. We recast the energy conditions as bounds on the
deceleration and normalized Hubble parameters, obtaining new bounds which are
necessary and sufficient for the local fulfillment of the energy conditions. A
statistical confrontation, with $1\sigma-3\sigma$ confidence levels, between
our bounds and supernovae data from the gold and combined samples is made for
the recent past. Our analyses indicate, with $3\sigma$ confidence levels, the
fulfillment of both the weak energy condition (WEC) and dominant energy
condition (DEC) for $z \leq 1$ and $z \lesssim 0.8$, respectively. In addition,
they suggest a possible recent violation of the null energy condition (NEC)
with $3\sigma$, i.e. a very recent phase of super-acceleration. Our analyses
also show the possibility of violation of the strong energy condition
(\textbf{SEC}) with $3\sigma$ in the recent past ($z \leq 1$), but
interestingly the $q(z)$-best-fit curve crosses the SEC-fulfillment divider at
$z \simeq 0.67$, which is a value very close to the beginning of the epoch of
cosmic acceleration predicted by the standard concordance flat $\Lambda$CDM
scenario.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 21:03:21 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 20:12:53 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Lima",
"M. P.",
""
],
[
"Vitenti",
"S.",
""
],
[
"Reboucas",
"M. J.",
""
]
] | [
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] |
802.0707 | Gerrit van der Plas | G. van der Plas (1,2), M. E. van den Ancker (1), D. Fedele (1,3,4), B.
Acke (5), C. Dominik (2), L.B.F.M. Waters (2) and J. Bouwman (4) ((1)
European Southern Observatory, (2) University of Amsterdam, (3) Universita
Degli Studi Di Padova, (4) Max-Planck-Institut fur Astronomie, Heidelberg,
(5) Institute of Astronomy, KU Leuven) | The Structure of Protoplanetary Disks Surrounding Three Young
Intermediate Mass Stars. I. Resolving the disk rotation in the [OI] 6300 \AA
line | 11 pages, 19 figures, accepted in A&A on 04/02/2008; added references | Astron.Astrophys.485:487-495,2008 | 10.1051/0004-6361:20078867 | null | astro-ph | null | We present high spectral resolution optical spectra of three young
intermediate mass stars, in all of which we spectrally resolve the 6300
Angstrom [OI] emission line. Two of these have a double peaked line profile. We
fit these data with a simple model of the [OI] emission caused by
photo-dissociation of OH molecules in the upper layer of a circumstellar disk
by stellar UV radiation and thus translate the Doppler broadened [OI] emission
profile into an amount of emission as a function of distance from the central
star. The resulting spectra are in agreement with the expected disk shapes as
derived from their spectral energy distribution. We find evidence for shadowing
by an inner rim in the disk surrounding HD101412 and see a flaring disk
structure in HD179218 while the [OI] spectrum of HD135344 is more complex. The
[OI] emission starts for all three targets at velocities corresponding to their
dust sublimation radius and extends up to radii of 10 -- 90 AU. This shows that
this method can be a valuable tool in the future investigation of circumstellar
disks.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 21:19:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"van der Plas",
"G.",
""
],
[
"Ancker",
"M. E. van den",
""
],
[
"Fedele",
"D.",
""
],
[
"Acke",
"B.",
""
],
[
"Dominik",
"C.",
""
],
[
"Waters",
"L. B. F. M.",
""
],
[
"Bouwman",
"J.",
""
]
] | [
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] |
802.0708 | Jaime Pineda | Jaime E. Pineda, Paola Caselli, and Alyssa A. Goodman | CO Isotopologues in the Perseus Molecular Cloud Complex: the X-Factor
and Regional Variations | 40 pages, 12 figures, accepted for publication in ApJ; version with
high resolution figures available at
http://www.cfa.harvard.edu/~jpineda/post/cal-co-v2.pdf | null | 10.1086/586883 | null | astro-ph | null | We use the COMPLETE data to derive new calibrations of the X-factor and the
13CO abundance within Perseus. We divide Perseus into six sub-regions. The
standard X factor, X=N(H2)/W(12CO), is derived both for the whole Perseus
Complex and for each of the six sub-regions with values consistent with
previous estimates. The X factor is heavily affected by the saturation of the
emission above AV~4 mag, and variations are found between regions. We derive
linear fits to relate W(12CO) and AV using only points below 4 mag of
extinction, this yields a better estimation of the AV than the X-factor. We
derive linear relations of W(13CO), N(13CO) and W(C18O) with AV . The
extinction threshold above which 13CO(1-0) and C18O(1-0) are detected is about
1 mag larger than previous estimates. 12CO(1-0) and 13CO(1-0) lines saturate
above 4 and 5 mag, respectively, whereas C18O(1-0) never saturates (up to 10
mag). Approximately 60% of the positions with 12CO emission have sub-thermally
excited lines, and almost all positions have 12CO excitation temperatures below
the dust temperature. Using the Meudon PDR code we find that 12CO and 13CO
emission can be explained by uniform slab models with densities ranging between
about 10^3 and 10^4 cm-3. Local variations in the volume density and
non-thermal motions (linked to different star formation activity) can explain
the observations. Higher densities are needed to reproduce CO data toward
active star forming sites, where the larger internal motions driven by the
young protostars allow more photons from the embedded high density cores to
escape the cloud. In the most quiescent region, the 12CO and 13CO emission
appears to arise from an almost uniform thin layer of molecular material at
densities around 10^4 cm-3.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:46:04 GMT"
}
] | 2008-05-15T00:00:00 | [
[
"Pineda",
"Jaime E.",
""
],
[
"Caselli",
"Paola",
""
],
[
"Goodman",
"Alyssa A.",
""
]
] | [
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] |
802.0709 | Jason Fox Manning | Ian Agol, Daniel Groves, Jason Fox Manning | Residual finiteness, QCERF, and fillings of hyperbolic groups | (v1) 22 pages, 2 figures. (v2) 24 pages, 2 figures. An error in the
proof and statement of the main technical lemma was corrected, and some other
small corrections and clarifications were made | Geom. Topol. 13 (2009) 1043-1073 | 10.2140/gt.2009.13.1043 | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that if every hyperbolic group is residually finite, then every
quasi-convex subgroup of every hyperbolic group is separable. The main tool is
relatively hyperbolic Dehn filling.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 21:20:39 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Mar 2008 15:39:46 GMT"
}
] | 2014-11-11T00:00:00 | [
[
"Agol",
"Ian",
""
],
[
"Groves",
"Daniel",
""
],
[
"Manning",
"Jason Fox",
""
]
] | [
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] |
802.071 | Michael Pawellek | Michael Pawellek | Quantum mass correction for the twisted kink | 18 pages, 2 figures;v2:references and discussion added, typos
corrected | J. Phys. A 42 045404,2009 | 10.1088/1751-8113/42/4/045404 | FAU-TP3-08/1 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analytic result for the 1-loop quantum mass correction in
semiclassical quantization for the twisted \phi^4 kink on S^1 without explicit
knowledge of the fluctuation spectrum. For this purpose we use the contour
integral representation of the spectral zeta function. By solving the Bethe
ansatz equations for the n=2 Lame equation we obtain an analytic expression for
the corresponding spectral discriminant. We discuss the renormalization issues
of this model. An energetically preferred size for the compact space is finally
obtained.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 09:57:02 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Aug 2008 13:03:10 GMT"
}
] | 2012-10-02T00:00:00 | [
[
"Pawellek",
"Michael",
""
]
] | [
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802.0711 | Tanmay Vachaspati | Tanmay Vachaspati | Cosmic Sparks from Superconducting Strings | PRL version | Phys.Rev.Lett.101:141301,2008 | 10.1103/PhysRevLett.101.141301 | null | astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cosmic sparks from cusps on superconducting cosmic strings in
light of the recently discovered millisecond radio burst by Lorimer et al [1].
We find that the observed duration, fluence, spectrum, and event rate can be
reasonably explained by Grand Unification scale superconducting cosmic strings
that carry currents \sim 10^5 GeV. The superconducting string model predicts an
event rate that falls off only as S^{-1/2}, where S is the energy flux, and
hence predicts a population of very bright bursts. Other surveys, with
different observational parameters, are shown to impose tight constraints on
the superconducting string model.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:12:52 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 21:59:33 GMT"
},
{
"version": "v3",
"created": "Mon, 29 Sep 2008 15:13:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vachaspati",
"Tanmay",
""
]
] | [
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] |
802.0712 | Jiahong Wu | John Meng-Kai Hong, Jiahong Wu and Juan-Ming Yuan | A new solution representation for the BBM equation in a quarter plane
and the eventual periodicity | null | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The initial- and boundary-value problem for the Benjamin-Bona-Mahony (BBM)
equation is studied in this paper. The goal is to understand the periodic
behavior (termed as eventual periodicity) of its solutions corresponding to
periodic boundary condition or periodic forcing. To this aim, we derive a new
formula representing solutions of this initial- and boundary-value problem by
inverting the operator $\partial_t +\alpha \partial_x -\gamma\partial_{xxt}$
defined in the space-time quarter plane. The eventual periodicity of the
linearized BBM equation with periodic boundary data and forcing term is
established by combining this new representation formula and the method of
stationary phase.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:14:40 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Hong",
"John Meng-Kai",
""
],
[
"Wu",
"Jiahong",
""
],
[
"Yuan",
"Juan-Ming",
""
]
] | [
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-0.0852150172,
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-0.0287163593,
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] |
802.0713 | Wei Bao | Wei Bao, Z.Q. Mao, Z. Qu, J.W. Lynn | Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7 | 4 pages, 5 figures | Phys. REv. Lett. 100, 247203 (2008) | 10.1103/PhysRevLett.100.247203 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The laminar perovskite Ca3Ru2O7 naturally forms ferromagnetic double-layers
of alternating moment directions, as in the spin-valve superlattices. The
mechanism of huge magnetoresistive effect in the material has been
controversial due to a lack of clear understanding of various magnetic phases
and phase-transitions. In this neutron diffraction study in a magnetic field,
we identify four different magnetic phases in Ca3Ru2O7 and determine all
first-order and second-order phase transitions between them. The spin-valve
mechanism then readily explains the dominant magnetoresistive effect in
Ca3Ru2O7.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:16:46 GMT"
}
] | 2008-06-27T00:00:00 | [
[
"Bao",
"Wei",
""
],
[
"Mao",
"Z. Q.",
""
],
[
"Qu",
"Z.",
""
],
[
"Lynn",
"J. W.",
""
]
] | [
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0.0406294912,
0.0118909627,
0.0508845299,
0.0145768067,
-0.0296419486,
0.1503095776,
0.0438280851,
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0.0443896726,
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] |
802.0714 | Fiorenza Donato | A. Bottino, F. Donato, N. Fornengo (Torino Un.), S. Scopel (KIAS,
Seoul) | Upper bounds on signals due to WIMP self--annihilation: comments on the
case of the synchrotron radiation from the galactic center and the WMAP haze | 3 pages, comments and 1 figure added | Phys.Rev.D77:127301,2008 | 10.1103/PhysRevD.77.127301 | null | hep-ph astro-ph | null | Two recent papers reconsider the possibility that the excess of microwave
emission from a region within $\sim 20^0$ of the galactic center (the {\it WMAP
haze}), measured by WMAP, can be due to the synchrotron emission originated by
neutralino self-annihilation; on the basis of this possible occurrence, also
upper bounds on the neutralino self-annihilation cross--section are suggested.
In the present note, we show that in the common case of thermal WIMPs in a
standard cosmological model, when the rescaling of the galactic WIMP density is
duly taken into account for subdominant WIMPs, the upper bound applicable
generically to {\it any} signal due to self-conjugate WIMPs is more stringent
than the ones obtained from analysis of the WMAP haze. We also argue that an
experimental upper bound, which can compete with our generic upper limit, can
rather be derived from measurements of cosmic antiproton fluxes, for some
values of the parameters of the astrophysical propagation model. Finally, we
comment on the possible impact of our generic upper bound on the interpretation
of the WMAP haze in terms of thermal neutralinos in a standard cosmological
scheme.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:17:03 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 20:56:11 GMT"
},
{
"version": "v3",
"created": "Sat, 16 Feb 2008 11:40:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bottino",
"A.",
"",
"Torino Un."
],
[
"Donato",
"F.",
"",
"Torino Un."
],
[
"Fornengo",
"N.",
"",
"Torino Un."
],
[
"Scopel",
"S.",
"",
"KIAS,\n Seoul"
]
] | [
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] |
802.0715 | Andreas Ross | Barry R. Holstein, Andreas Ross | Spin Effects in Long Range Electromagnetic Scattering | 58 pages, 3 figures | null | null | null | hep-ph hep-th nucl-th | null | We analyze the electromagnetic scattering of massive particles with and
without spin and, using the techniques of effective field theory, we isolate
the leading long distance effects beyond one photon exchange, both classical
and quantum mechanical. Spin-independent and spin-dependent effects are
isolated and shown to have a universal structure.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:31:34 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Holstein",
"Barry R.",
""
],
[
"Ross",
"Andreas",
""
]
] | [
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] |
802.0716 | Andreas Ross | Barry R. Holstein, Andreas Ross | Spin Effects in Long Range Gravitational Scattering | 51 pages, 8 figures | null | null | null | hep-ph gr-qc hep-th | null | We study the gravitational scattering of massive particles with and without
spin in the effective theory of gravity at one loop level. Our focus is on long
distance effects arising from nonanalytic components of the scattering
amplitude and we show that the spin-independent and the spin-dependent long
range components exhibit a universal form. Both classical and quantum
corrections are obtained, and the definition of a proper second order potential
is discussed.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:34:46 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Holstein",
"Barry R.",
""
],
[
"Ross",
"Andreas",
""
]
] | [
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] |
802.0717 | Andreas Ross | Barry R. Holstein, Andreas Ross | Long Distance Effects in Mixed Electromagnetic-Gravitational Scattering | 38 pages, 6 figures | null | null | null | hep-ph gr-qc hep-th | null | Using the methods of effective field theory we examine long range effects in
mixed electromagnetic-gravitational scattering. Recent calculations which have
yielded differing results for such effects are examined and corrected. We
consider various spin configurations of the scattered particles and find that
universality with respect to spin-dependence is obtained in agreement with
expectations.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 03:56:03 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Holstein",
"Barry R.",
""
],
[
"Ross",
"Andreas",
""
]
] | [
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] |
802.0718 | Eliza Miller-Ricci | E. Miller-Ricci, J.F. Rowe, D. Sasselov, J.M. Matthews, D.B. Guenther,
R. Kuschnig, A.F.J Moffat, S.M. Rucinski, G.A.H Walker, W.W. Weiss | MOST Spacebased Photometry of the Transiting Exoplanet System HD 209458:
Transit Timing to Search for Additional Planets | 21 pages, 6 figures, accepted to the ApJ | null | 10.1086/587446 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the measurement of transit times for the HD 209458 planetary
system from photometry obtained with the MOST (Microvariability & Oscillations
of STars) space telescope. Deviations from a constant orbital period can
indicate the presence of additional planets in the system that are yet
undetected, potentially with masses approaching an Earth mass. The MOST data
sets of HD 209458 from 2004 and 2005 represent unprecedented time coverage with
nearly continuous observations spanning 14 and 43 days and monitoring 3
transits and 12 consecutive transits, respectively. The transit times we obtain
show no variations on three scales: (a) no long-term change in P since before
2004 at the 25 ms level, (b) no trend in transit timings during the 2005 run,
and (c) no individual transit timing deviations above 80 sec level. Together
with previously published transit times from Agol & Steffen (2007), this allows
us to place limits on the presence of additional close-in planets in the
system, in some cases down to below an Earth mass. This result, along with
previous radial velocity work, now eliminates the possibility that a perturbing
planet could be responsible for the additional heat source needed to explain HD
209458b's anomalous low density.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:22:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Miller-Ricci",
"E.",
""
],
[
"Rowe",
"J. F.",
""
],
[
"Sasselov",
"D.",
""
],
[
"Matthews",
"J. M.",
""
],
[
"Guenther",
"D. B.",
""
],
[
"Kuschnig",
"R.",
""
],
[
"Moffat",
"A. F. J",
""
],
[
"Rucinski",
"S. M.",
""
],
[
"Walker",
"G. A. H",
""
],
[
"Weiss",
"W. W.",
""
]
] | [
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] |
802.0719 | Jan Ambjorn | J. Ambjorn, R. Loll, Y. Watabiki, W. Westra and S. Zohren | A String Field Theory based on Causal Dynamical Triangulations | 29 pages, 4 figures | JHEP0805:032,2008 | 10.1088/1126-6708/2008/05/032 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate the string field theory in zero-dimensional target space
corresponding to the two-dimensional quantum gravity theory defined through
Causal Dynamical Triangulations. This third quantization of the quantum gravity
theory allows us in principle to calculate the transition amplitudes of
processes in which the topology of space changes in time, and to include
non-trivial topologies of space-time. We formulate the corresponding
Dyson-Schwinger equations and illustrate how they can be solved iteratively.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:27:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ambjorn",
"J.",
""
],
[
"Loll",
"R.",
""
],
[
"Watabiki",
"Y.",
""
],
[
"Westra",
"W.",
""
],
[
"Zohren",
"S.",
""
]
] | [
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] |
802.072 | Rafael Porto | Rafael A. Porto and Ira Z. Rothstein | Spin(1)Spin(2) Effects in the Motion of Inspiralling Compact Binaries at
Third Order in the Post-Newtonian Expansion | 31 pages, 3 figures. v4: All the irrelevant (spin-independent) terms
in eqs (22) and (23) are now omitted, as in eqs (24) and (25), to avoid any
possible confusion regarding the self-consistency of the tetrad ('ee=g'). The
procedure and results in the paper are unaltered | Phys.Rev.D78:044012,2008; Erratum-ibid.D81:029904,2010 | 10.1103/PhysRevD.78.044012 10.1103/PhysRevD.81.029904 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use effective field theory techniques to compute the potentials due to
spin-spin and spin-orbit effects, from which the spin(1)spin(2) contribution to
the motion of spinning compact binaries to third Post-Newtonian (PN) order
follow. We use a formalism which allows us to impose the spin supplementarity
condition (SSC) in a canonical framework to all orders in the PN expansion. We
explicitly show the equivalence with our previous results, obtained using the
Newton-Wigner SSC at the level of the action for spin-spin and spin-orbit
potentials reported in arXiv:gr-qc/0604099 and arXiv:0712.2032[gr-qc]
respectively.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:49:42 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Apr 2008 22:29:11 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Jul 2008 16:53:33 GMT"
},
{
"version": "v4",
"created": "Wed, 1 Apr 2009 14:08:09 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Porto",
"Rafael A.",
""
],
[
"Rothstein",
"Ira Z.",
""
]
] | [
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] |
802.0721 | Wei Bao | Q.M. Zhang, M. an, S.K. Yuan, Y. Wu, D. Wu, J.L. Luo, N.L. Wang, W.
Bao, Y.N. Wang | Phonon softening and "forbidden" mode observed by Raman scattering in
Na0.5CoO2 | 5 pages, 4 figures | Phys. Rev. B vol. 77, 045110 (2008) | 10.1103/PhysRevB.77.045110 | null | cond-mat.str-el cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Polarized Raman scattering measurements have been performed on Na0.5CoO2
single crystal from 8 to 305 K. Both the A1g and E1g phonon modes show a
softening below Tc1 ~ 83 K. Additionally, the A1g phonon mode, which is
forbidden in the scattering geometry of cross polarization for the triangular
CoO2 layers, appears below Tc1. In contrast, the metal-insulator transition at
Tc2 ~ 46 K has only secondary effect on the Raman spectra. The phonon softening
and the ``forbidden'' Raman intensity follow closely magnetic order parameter
and the gap function at the Fermi surface, indicating that the distortion of
CoO6 octahedra at Tc1, instead of the Na ordering at ~350 K, is the relevant
structural component of the 83 K phase transition.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:40:44 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Zhang",
"Q. M.",
""
],
[
"an",
"M.",
""
],
[
"Yuan",
"S. K.",
""
],
[
"Wu",
"Y.",
""
],
[
"Wu",
"D.",
""
],
[
"Luo",
"J. L.",
""
],
[
"Wang",
"N. L.",
""
],
[
"Bao",
"W.",
""
],
[
"Wang",
"Y. N.",
""
]
] | [
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] |
802.0722 | Abey L\'opez Garc\'ia | Abey L\'opez Garc\'ia, Guillermo L\'opez Lagomasino | Relative Asymptotic of Multiple Orthogonal Polynomials for Nikishin
Systems | 30 pages | J. Approx. Theory 158 (2009), 214-241 | null | null | math.CV | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove relative asymptotic for the ratio of two sequences of multiple
orthogonal polynomials with respect to Nikishin system of measures. The first
Nikishin system ${\mathcal{N}}(\sigma_1,...,\sigma_m)$ is such that for each
$k$, $\sigma_k$ has constant sign on its compact support $\supp {\sigma_k}
\subset \mathbb{R}$ consisting of an interval $\widetilde{\Delta}_k$, on which
$|\sigma_k^{\prime}| > 0$ almost everywhere, and a discrete set without
accumulation points in $\mathbb{R} \setminus \widetilde{\Delta}_k$. If
${Co}(\supp {\sigma_k}) = \Delta_k$ denotes the smallest interval containing
$\supp {\sigma_k}$, we assume that $\Delta_k \cap \Delta_{k+1} = \emptyset$,
$k=1,...,m-1$. The second Nikishin system
${\mathcal{N}}(r_1\sigma_1,...,r_m\sigma_m)$ is a perturbation of the first by
means of rational functions $r_k$, $k=1,...,m,$ whose zeros and poles lie in
$\mathbb{C} \setminus \cup_{k=1}^m \Delta_k$.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 22:44:48 GMT"
}
] | 2019-10-22T00:00:00 | [
[
"García",
"Abey López",
""
],
[
"Lagomasino",
"Guillermo López",
""
]
] | [
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802.0723 | Sergey Grigorian | Sergey Grigorian, Shing-Tung Yau | Local geometry of the G2 moduli space | 27 pages | Commun.Math.Phys.287:459-488,2009 | 10.1007/s00220-008-0595-1 | null | hep-th | null | We consider deformations of torsion-free G2 structures, defined by the
G2-invariant 3-form $\phi$ and compute the expansion of the Hodge star of
$\phi$ to fourth order in the deformations of $\phi$. By considering M-theory
compactified on a G2 manifold, the G2 moduli space is naturally complexified,
and we get a Kahler metric on it. Using the expansion of the Hodge star of
$\phi$ we work out the full curvature of this metric and relate it to the
Yukawa coupling.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 23:07:39 GMT"
}
] | 2009-03-20T00:00:00 | [
[
"Grigorian",
"Sergey",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | [
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] |
802.0724 | Bennie F. L. Ward | B.F.L. Ward (1), S.A. Yost (2) ((1) Department of Physics, Baylor
University, Waco, TX, USA, (2) Department of Physics, Princeton University,
Princeton, NJ, USA) | New Developments in Precision LHC Theory: QEDXQCD Exponentiation,
Shower/ME Matching, IR-Improved DGLAP-CS Theory and Implications for UV
Finite Quantum Gravity | 8 pages, presented by BFLW at RADCOR07 | PoSRADCOR2007:038,2007 | null | BU-HEPP-08-01 | hep-ph | null | We present the recent developments in exact amplitude-based resummation
methods for non-Abelian gauge theories as they relate to precision LHC physics.
We discuss QEDXQCD exponentiation, shower/ME matching, IR-improved DGLAP-CS
theory and implications, as developed by one of us (BFLW), for a UV finite
theory of quantum general relativity.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 23:00:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ward",
"B. F. L.",
""
],
[
"Yost",
"S. A.",
""
]
] | [
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] |
802.0725 | Asaf Pe'er | Asaf Pe'er | Temporal Evolution Of Thermal Emission From Relativistically Expanding
Plasma | Typo corrected; Accepted for publication in ApJ | null | 10.1086/588136 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Propagation of photons in relativistically expanding plasma outflows,
characterized by steady Lorentz factor Gamma is considered. Photons that are
injected in regions of high optical depth are advected with the flow until they
escape at the photosphere. Below the photosphere, the photons are coupled to
the plasma via Compton scattering. I show here, that as a result of the slight
misalignment of the scattering electrons velocity vectors, the (local) comoving
photon energy decreases with radius as epsilon'(r) ~ r^{-2/3}. This mechanism
dominates the photon cooling in scenarios of faster adiabatic cooling of the
electrons. I then show that the photospheric radius of a relativistically
expanding plasma wind strongly depends on the angle to the line of sight,
theta. For theta <~ 1/Gamma, r_{ph} is theta independent, while for theta >~
1/Gamma, r_{ph} ~ theta^2. I show that the theta dependence of the photosphere
implies that for flow parameters characterizing GRBs, thermal photons
originating from below the photosphere can be observed up to tens of seconds
following the inner engine activity decay. I calculate the probability density
function P(r,theta) of a thermal photon to escape the plasma at radius r and
angle theta. Using this function, I show that following the termination of the
internal photon injection mechanism, the thermal flux decreases as F_{BB}^{ob.}
~ t^{-2}, and that the decay of the photon energy with radius results in a
power law decay of the observed temperature, T^{ob.}(t) ~ t^{-2/3} at early
times, which changes to t^{-1/2} later. Detailed numerical results are in very
good agreement with the analytical predictions. I discuss the consequences of
this temporal behavior in view of the recent evidence for a thermal emission
component observed during the prompt emission phase of GRBs.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 23:08:28 GMT"
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{
"version": "v2",
"created": "Tue, 11 Mar 2008 23:32:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pe'er",
"Asaf",
""
]
] | [
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] |
802.0726 | Fran\c{c}ois Nicolas | Francois Nicolas | (Generalized) Post Correspondence Problem and semi-Thue systems | Lecture notes. 14 pages | null | null | null | cs.DM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let PCP(k) denote the Post Correspondence Problem for k input pairs of
strings. Let ACCESSIBILITY(k) denote the the word problem for k-rule semi-Thue
systems. In 1980, Claus showed that if ACCESSIBILITY(k) is undecidable then
PCP(k + 4) is also undecidable. The aim of the paper is to present a clean,
detailed proof of the statement.
We proceed in two steps, using the Generalized Post Correspondence Problem as
an auxiliary. First, we prove that if ACCESSIBILITY(k) is undecidable then
GPCP(k + 2) is also undecidable. Then, we prove that if GPCP(k) is undecidable
then PCP(k + 2) is also undecidable. (The latter result has also been shown by
Harju and Karhumaki.) To date, the sharpest undecidability bounds for both PCP
and GPCP have been deduced from Claus's result: since Matiyasevich and
Senizergues showed that ACCESSIBILITY(3) is undecidable, GPCP(5) and PCP(7) are
undecidable.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 01:43:33 GMT"
},
{
"version": "v2",
"created": "Sun, 10 Feb 2008 23:54:15 GMT"
},
{
"version": "v3",
"created": "Wed, 13 Feb 2008 09:47:03 GMT"
},
{
"version": "v4",
"created": "Thu, 14 Feb 2008 12:40:31 GMT"
},
{
"version": "v5",
"created": "Wed, 12 Nov 2008 18:25:58 GMT"
}
] | 2008-11-12T00:00:00 | [
[
"Nicolas",
"Francois",
""
]
] | [
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] |
802.0727 | Finnur Larusson | Finnur Larusson and Rasul Shafikov | Schlicht envelopes of holomorphy and foliations by lines | Version 2: Terminology revised and title changed in view of
information about the origins of what we now call "the schlichtness lemma"
that we didn't have when we finished version 1. Version 3: A few minor
changes. To appear in Journal of Geometric Analysis | null | null | null | math.CV | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a domain Y in a complex manifold X, it is a difficult problem with no
general solution to determine whether Y has a schlicht envelope of holomorphy
in X, and if it does, to describe the envelope. The purpose of this paper is to
tackle the problem with the help of a smooth 1-dimensional foliation F of X
with no compact leaves. We call a domain Y in X an interval domain with respect
to F if Y intersects every leaf of F in a nonempty connected set. We show that
if X is Stein and if F satisfies a new property called quasiholomorphicity,
then every interval domain in X has a schlicht envelope of holomorphy, which is
also an interval domain. This result is a generalization and a global version
of a well-known lemma from the mid-1980s. We illustrate the notion of
quasiholomorphicity with sufficient conditions, examples, and counterexamples,
and present some applications, in particular to a little-studied boundary
regularity property of domains called local schlichtness.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 01:36:13 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 00:20:42 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Aug 2008 00:59:55 GMT"
}
] | 2008-08-08T00:00:00 | [
[
"Larusson",
"Finnur",
""
],
[
"Shafikov",
"Rasul",
""
]
] | [
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802.0728 | Shunji Tsuchiya | S. Tsuchiya, Y. Ohashi | Anomalous enhancement of quasiparticle current near a potential barrier
in a Bose-Einstein condensate | 4 pages, 3 figures, published version | Phys. Rev. A 78, 013628 (2008) | 10.1103/PhysRevA.78.013628 | null | cond-mat.other cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate tunneling properties of Bogoliubov phonons in a Bose-Einstein
condensate. We find the anomalous enhancement of the quasiparticle current
$J_{\rm q}$ carried by Bogoliubov phonons near a potential barrier, due to the
supply of the excess current from the condensate. This effect leads to the
increase of quasiparticle transmission probability in the low energy region
found by Kovrizhin {\it et al.}. We also show that the quasiparticle current
twists the phase of the condensate wavefunction across the barrier, leading to
a finite Josephson supercurrent $J_{\rm s}$ through the barrier. This induced
supercurrent flows in the opposite direction to the quasiparticle current so as
to cancel out the enhancement of $J_{\rm q}$ and conserve the total current
$J=J_{\rm q}+J_{\rm s}$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 01:43:32 GMT"
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{
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},
{
"version": "v3",
"created": "Mon, 15 Jun 2009 11:28:35 GMT"
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] | 2009-06-15T00:00:00 | [
[
"Tsuchiya",
"S.",
""
],
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"Y.",
""
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802.0729 | Yang Liu | Yang Liu | On the calculation of Schottky contact resistivity | null | null | null | null | cond-mat.mtrl-sci cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This numerical study examines the importance of self-consistently accounting
for transport and electrostatics in the calculaiton of semiconductor/metal
Schottky contact resistivity. It is shown that ignoring such self-consistency
results in significant under-estimation of the contact resistivity. An explicit
numerical method has also been proposed to efficiently improve contact
resistivity calculations.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 02:43:39 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Liu",
"Yang",
""
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802.073 | Veit Elser | Veit Elser, Simon Gravel | Laminating lattices with symmetrical glue | 14 pages, 6 figures | null | null | null | math.MG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the automorphism group $Aut(H)$, of holes in the lattice
$L_8=A_2\oplus A_2\oplus D_4$, as the starting point in the construction of
sphere packings in 10 and 12 dimensions. A second lattice, $L_4=A_2\oplus A_2$,
enters the construction because a subgroup of $Aut(L_4)$ is isomorphic to
$Aut(H)$. The lattices $L_8$ and $L_4$, when glued together through this
relationship, provide an alternative construction of the laminated lattice in
twelve dimensions with kissing number 648. More interestingly, the action of
$Aut(H)$ on $L_4$ defines a pair of invariant planes through which dense,
non-lattice packings in 10 dimensions can be constructed. The most symmetric of
these is aperiodic with center density 1/32. These constructions were prompted
by an unexpected arrangement of 378 kissing spheres discovered by a search
algorithm.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 03:01:52 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Elser",
"Veit",
""
],
[
"Gravel",
"Simon",
""
]
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] |
802.0731 | Mikhail Kostylev | M. Kostylev, R.Magaraggia, F.Y. Ogrin, V. Mescheryakov, N. Ross, and
R.L. Stamps | Self-organized plane arrays of metallic magnetic elements | null | null | null | null | cond-mat.mtrl-sci cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the dynamic magnetic properties of plane periodical arrays of
circular permalloy nano-dots fabricated using a self-organized mask formed by
polysterene nanospheres on the surface of a Permalloy film. Conventional
(microwave cavity) and broadband coplanar-line ferromagnetic resonance setups
were used for the measurements. We found several well resolved resonance peaks.
This result shows that the self-organized mask fabrication technique is able to
produce high-quality samples with small dispersion of geometrical and magnetic
parameters.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 03:03:27 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Kostylev",
"M.",
""
],
[
"Magaraggia",
"R.",
""
],
[
"Ogrin",
"F. Y.",
""
],
[
"Mescheryakov",
"V.",
""
],
[
"Ross",
"N.",
""
],
[
"Stamps",
"R. L.",
""
]
] | [
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] |
802.0732 | Masao Iwamatsu | Masao Iwamatsu | Direct numerical simulation of homogeneous nucleation and growth in a
phase-field model using cell dynamics method | 9 pages, 8 figures, Journal of Chemical Physics to be published | null | 10.1063/1.2883652 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Homogeneous nucleation and growth in a simplest two-dimensional phase field
model is numerically studied using the cell dynamics method. Whole process from
nucleation to growth is simulated and is shown to follow closely the
Kolmogorov-Johnson-Mehl-Avrami (KJMA) scenario of phase transformation.
Specifically the time evolution of the volume fraction of new stable phase is
found to follow closely the KJMA formula. By fitting the KJMA formula directly
to the simulation data, not only the Avrami exponent but the magnitude of
nucleation rate and, in particular, of incubation time are quantitatively
studied. The modified Avrami plot is also used to verify the derived KJMA
parameters. It is found that the Avrami exponent is close to the ideal
theoretical value m=3. The temperature dependence of nucleation rate follows
the activation-type behavior expected from the classical nucleation theory. On
the other hand, the temperature dependence of incubation time does not follow
the exponential activation-type behavior. Rather the incubation time is
inversely proportional to the temperature predicted from the theory of
Shneidman and Weinberg [J. Non-Cryst. Solids {\bf 160}, 89 (1993)]. A need to
restrict thermal noise in simulation to deduce correct Avrami exponent is also
discussed.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 03:03:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iwamatsu",
"Masao",
""
]
] | [
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] |
802.0733 | Jason Steffen | Jason H. Steffen | Optimal boarding method for airline passengers | Accepted for publication in the Journal of Air Transport Management.
This study was motivated by an experience that occurred while traveling to a
conference. Version 1: 15 pages, 7 figures--likely to be of more technical
interest. Version 2: 14 pages, 6 figures--more complete bibliography and some
additional commentary | J.Air Transp.Mgmt.14:146-150,2008 | 10.1016/j.jairtraman.2008.03.003 | FERMILAB-PUB-08-035-A-CD | physics.soc-ph physics.pop-ph | null | Using a Markov Chain Monte Carlo optimization algorithm and a computer
simulation, I find the passenger ordering which minimizes the time required to
board the passengers onto an airplane. The model that I employ assumes that the
time that a passenger requires to load his or her luggage is the dominant
contribution to the time needed to completely fill the aircraft. The optimal
boarding strategy may reduce the time required to board and airplane by over a
factor of four and possibly more depending upon the dimensions of the aircraft.
In addition, knowledge of the optimal boarding procedure can inform decisions
regarding changes to methods that are employed by a particular carrier. I
explore some of the salient features of the optimal boarding method and discuss
practical modifications to the optimal. Finally, I mention some of the benefits
that could come from implementing an improved passenger boarding scheme.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 04:20:41 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 16:11:59 GMT"
}
] | 2009-09-17T00:00:00 | [
[
"Steffen",
"Jason H.",
""
]
] | [
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] |
802.0734 | Bernard Russo | Matthew Neal and Bernard Russo | Contractively complemented subspaces of pre-symmetric spaces | 25 pages | Israel J. Math. 182 (2011), 293-331 | null | null | math.OA math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1965, Ron Douglas proved that if $X$ is a closed subspace of an
$L^1$-space and $X$ is isometric to another $L^1$-space, then $X$ is the range
of a contractive projection on the containing $L^1$-space. In 1977
Arazy-Friedman showed that if a subspace $X$ of $C_1$ is isometric to another
$C_1$-space (possibly finite dimensional), then there is a contractive
projection of $C_1$ onto $X$. In 1993 Kirchberg proved that if a subspace $X$
of the predual of a von Neumann algebra $M$ is isometric to the predual of
another von Neumann algebra, then there is a contractive projection of the
predual of $M$ onto $X$.
We widen significantly the scope of these results by showing that if a
subspace $X$ of the predual of a $JBW^*$-triple $A$ is isometric to the predual
of another $JBW^*$-triple $B$, then there is a contractive projection on the
predual of $A$ with range $X$, as long as $B$ does not have a direct summand
which is isometric to a space of the form $L^\infty(\Omega,H)$, where $H$ is a
Hilbert space of dimension at least two. The result is false without this
restriction on $B$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 04:16:30 GMT"
}
] | 2015-12-11T00:00:00 | [
[
"Neal",
"Matthew",
""
],
[
"Russo",
"Bernard",
""
]
] | [
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] |
802.0735 | Oleg Lunin | Oleg Lunin | Brane webs and 1/4-BPS geometries | 97 pages, added refs | null | 10.1088/1126-6708/2008/09/028 | EFI-08-02 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss brane webs preserving eight supercharges and derive geometries
produced by them. Consistency conditions of supergravity are shown to impose
certain requirements on the locations of the sources, and these restrictions
are found to be in a perfect agreement with results of the probe analysis. In
particular, solutions of IIB SUGRA describing (p,q) stings are inconsistent,
unless the web consists of straight line segments whose orientation is
correlated with charges of the string. The geometries produced by membranes and
D3 branes are only consistent if brane profiles are holomorphic. Using
perturbation theory, we show that a unique gravity solution exists for any
allowed distribution of sources. We also revisit 1/4-BPS geometries with AdS_p
x S^q asymptotics and derive the boundary conditions leading to regular
geometries. All degenerate limits of regular solutions are shown to agree with
expectations from the brane probe analysis.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 04:28:26 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jul 2008 22:02:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lunin",
"Oleg",
""
]
] | [
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] |
802.0736 | Abdollah Langari | H. Rezania, A. Langari and P. Thalmeier | Green's function approach to quantum criticality in the anisotropic
Kondo-necklace model | 14 pages and 7 EPS figures | Phys. Rev. B 77, 094438 (2008) | 10.1103/PhysRevB.77.094438 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the quantum phase transition between the antiferromagnetic
and spin liquid phase for the two dimensional anisotropic Kondo-necklace model.
The bond operator formalism has been implemented to transform the spin
Hamiltonian to a bosonic one. We have used the Green's function approach
including a hard core repulsion to find the low energy excitation spectrum of
the model. The bosonic excitations become gapless at the quantum critical point
where the phase transition from the Kondo singlet state to long range
antiferromagnetic order takes place. We have studied the effect of both
inter-site (delta) and local (Delta) anisotropies on the critical point and on
the critical exponent of the excitation gap in the paramagnetic phase. We have
also compared our results with previous bond operator mean field calculations.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 04:41:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rezania",
"H.",
""
],
[
"Langari",
"A.",
""
],
[
"Thalmeier",
"P.",
""
]
] | [
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] |
802.0737 | Daniel Whalen | Daniel Whalen, Jason X. Prochaska, Alexander Heger, Jason Tumlinson | The Molecular Hydrogen Deficit in Gamma-Ray Burst Afterglows | 12 pages, 7 figures, accepted for ApJ | null | 10.1086/589537 | LA-UR 07-5988 | astro-ph | null | Recent analysis of five gamma-ray burst (GRB) afterglow spectra reveal the
absence of molecular hydrogen absorption lines, a surprising result in light of
their large neutral hydrogen column densities and the detection of H$_2$ in
similar, more local star-forming regions like 30 Doradus in the Large
Magellanic Cloud (LMC). Observational evidence further indicates that the bulk
of the neutral hydrogen column in these sight lines lies 100 pc beyond the
progenitor and that H$_2$ was absent prior to the burst, suggesting that direct
flux from the star, FUV background fields, or both suppressed its formation. We
present one-dimensional radiation hydrodynamical models of GRB host galaxy
environments, including self-consistent radiative transfer of both ionizing and
Lyman-Werner photons, nine-species primordial chemistry with dust formation of
H$_2$, and dust extinction of UV photons. We find that a single GRB progenitor
is sufficient to ionize neutral hydrogen to distances of 50 - 100 pc but that a
galactic Lyman-Werner background is required to dissociate the molecular
hydrogen in the ambient ISM. Intensities of 0.1 - 100 times the Galactic mean
are necessary to destroy H$_2$ in the cloud, depending on its density and
metallicity. The minimum radii at which neutral hydrogen will be found in
afterglow spectra is insensitive to the mass of the progenitor or the initial
mass function (IMF) of its cluster, if present.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 04:43:11 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 05:42:36 GMT"
},
{
"version": "v3",
"created": "Tue, 15 Apr 2008 21:20:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Whalen",
"Daniel",
""
],
[
"Prochaska",
"Jason X.",
""
],
[
"Heger",
"Alexander",
""
],
[
"Tumlinson",
"Jason",
""
]
] | [
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802.0738 | Marco Chiani Dr. | Marco Chiani, Moe Z. Win, Hyundong Shin | MIMO Networks: the Effects of Interference | Submitted to IEEE Trans. on Info. Theory | IEEE Trans. Inform. Theory, vol. 56, no. 1, pp. 336-349, Jan. 2010 | 10.1109/TIT.2009.2034810 | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multiple-input/multiple-output (MIMO) systems promise enormous capacity
increase and are being considered as one of the key technologies for future
wireless networks. However, the decrease in capacity due to the presence of
interferers in MIMO networks is not well understood. In this paper, we develop
an analytical framework to characterize the capacity of MIMO communication
systems in the presence of multiple MIMO co-channel interferers and noise. We
consider the situation in which transmitters have no information about the
channel and all links undergo Rayleigh fading. We first generalize the known
determinant representation of hypergeometric functions with matrix arguments to
the case when the argument matrices have eigenvalues of arbitrary multiplicity.
This enables the derivation of the distribution of the eigenvalues of Gaussian
quadratic forms and Wishart matrices with arbitrary correlation, with
application to both single user and multiuser MIMO systems. In particular, we
derive the ergodic mutual information for MIMO systems in the presence of
multiple MIMO interferers. Our analysis is valid for any number of interferers,
each with arbitrary number of antennas having possibly unequal power levels.
This framework, therefore, accommodates the study of distributed MIMO systems
and accounts for different positions of the MIMO interferers.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 04:47:53 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Apr 2009 16:53:46 GMT"
},
{
"version": "v3",
"created": "Thu, 8 Oct 2009 07:38:45 GMT"
}
] | 2010-07-28T00:00:00 | [
[
"Chiani",
"Marco",
""
],
[
"Win",
"Moe Z.",
""
],
[
"Shin",
"Hyundong",
""
]
] | [
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802.0739 | Jamil Aslam | M. Jamil Aslam and Cai-Dian Lu | B \to 0^{+}(1^{+}) + missing energy in Unparticle Physics | 16 pages, 6 figures | Chin.Phys.C33:332-339,2009 | 10.1088/1674-1137/33/5/003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the effects of an unparticle $\mathcal{U}$ as a possible source of
missing energy in the p-wave decays of $B$ meson. The dependence of the
differential branching ratio on the $K_{0}^{\ast}(K_{1}) -$% meson's energy is
discussed in the presence of scalar and vector unparticle operators and
significant deviation from the standard model value is found after addition of
these operators. Finally, we have shown the dependence of branching ratio for
the above said decays on the parameters of the unparticle stuff like the
effective couplings, cutoff scale $\Lambda_{% \mathcal{U}}$ and the scale
dimensions $d_{\mathcal{U}}$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 05:00:30 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Sep 2008 04:26:08 GMT"
}
] | 2009-06-19T00:00:00 | [
[
"Aslam",
"M. Jamil",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | [
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802.074 | Jamil Aslam | Ishtiaq Ahmed, M. Ali Paracha and M. Jamil Aslam | Exclusive B-> K_{1}l ^{+}l ^{-} decay in model with single universal
extra dimension | 19 pages, 4 figures | Eur.Phys.J.C54:591-599,2008 | 10.1140/epjc/s10052-008-0553-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Decay rate and forward-backward asymmetries in B -> K_{1} l^{+} l ^{-}, K_{1}
is the axial vector meson, are calculated in the universal extra dimension
(UED) model. The dependence of these physical quantities on the
compactification radius $R$, the only unknown parameter in UED model, is
studied and it is shown that zero of forward-backward asymmetry is sensitive to
the UED model, therefore they can be very useful tool to establish new physics
predicted by the UED model. This work is briefly extended to B ->
K^{*}l^{+}l^{-}.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 06:13:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ahmed",
"Ishtiaq",
""
],
[
"Paracha",
"M. Ali",
""
],
[
"Aslam",
"M. Jamil",
""
]
] | [
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802.0741 | Shinya Tomizawa | Shinya Tomizawa | Multi-Black Rings on Eguchi-Hanson Space | 23 pages, references are added, to be published in Classical and
Quantum Gravity | Class.Quant.Grav.25:145014,2008 | 10.1088/0264-9381/25/14/145014 | OCU-PHYS 287, AP-GR 53 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct new supersymmetric multi-black ring solutions on the
Eguchi-Hanson base space as solutions of the five-dimensional minimal
supergravity. The space-time has an asymptotically locally Euclidean time
slice, i.e., it has the spatial infinity with the topology of the lens space
$L(2;1)=S^3/Z_2$. The configurations of black rings are restricted by the
requirement of the absence of a Dirac-Misner string everywhere outside
horizons. Especially, in the case of two black rings, the solutions have the
limit to a pair of rotating black holes with the horizon topology of S^3.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 06:24:46 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Apr 2008 06:58:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tomizawa",
"Shinya",
""
]
] | [
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802.0742 | Bogdan Vioreanu | Bogdan G. Vioreanu | Mordell-Weil Problem for Cubic Surfaces, Numerical Evidence | 22 pages, 3 figures | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let V be a plane smooth cubic curve over a finitely generated field k. The
Mordell-Weil theorem for V states that there is a finite subset P \subset V(k)
such that the whole V(k) can be obtained from P by drawing secants and tangents
through pairs of previously constructed points and consecutively adding their
new intersection points with V. In this paper we present numerical data
regarding the analogous statement for cubic surfaces. For the surfaces
examined, we also test Manin's conjecture relating the asymptotics of rational
points of bounded height on a Fano variety with the rank of the Picard group of
the surface.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 06:45:41 GMT"
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] | 2008-02-07T00:00:00 | [
[
"Vioreanu",
"Bogdan G.",
""
]
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802.0743 | M. J. Bayarri | M. J. Bayarri, M. E. Castellanos | Bayesian Checking of the Second Levels of Hierarchical Models | This paper commented in: [arXiv:0802.0746], [arXiv:0802.0747],
[arXiv:0802.0749], [arXiv:0802.0752]. Rejoinder in [arXiv:0802.0754].
Published in at http://dx.doi.org/10.1214/07-STS235 the Statistical Science
(http://www.imstat.org/sts/) by the Institute of Mathematical Statistics
(http://www.imstat.org) | Statistical Science 2007, Vol. 22, No. 3, 322-343 | 10.1214/07-STS235 | IMS-STS-STS235 | stat.ME | null | Hierarchical models are increasingly used in many applications. Along with
this increased use comes a desire to investigate whether the model is
compatible with the observed data. Bayesian methods are well suited to
eliminate the many (nuisance) parameters in these complicated models; in this
paper we investigate Bayesian methods for model checking. Since we contemplate
model checking as a preliminary, exploratory analysis, we concentrate on
objective Bayesian methods in which careful specification of an informative
prior distribution is avoided. Numerous examples are given and different
proposals are investigated and critically compared.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 08:31:37 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Bayarri",
"M. J.",
""
],
[
"Castellanos",
"M. E.",
""
]
] | [
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802.0744 | Alexei Zhedanov | Luc Vinet and Alexei Zhedanov | Quasi-Linear Algebras and Integrability (the Heisenberg Picture) | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4 (2008), 015, 22 pages | 10.3842/SIGMA.2008.015 | null | math.QA math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We study Poisson and operator algebras with the ''quasi-linear property''
from the Heisenberg picture point of view. This means that there exists a set
of one-parameter groups yielding an explicit expression of dynamical variables
(operators) as functions of ''time'' $t$. We show that many algebras with
nonlinear commutation relations such as the Askey-Wilson, $q$-Dolan-Grady and
others satisfy this property. This provides one more (explicit Heisenberg
evolution) interpretation of the corresponding integrable systems.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 07:10:27 GMT"
}
] | 2008-04-25T00:00:00 | [
[
"Vinet",
"Luc",
""
],
[
"Zhedanov",
"Alexei",
""
]
] | [
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802.0745 | Sander Spek | Sander Spek | Knowledge management by wikis | Position paper, not submitted elsewhere | null | null | null | cs.DL | null | Wikis provide a new way of collaboration and knowledge sharing. Wikis are
software that allows users to work collectively on a web-based knowledge base.
Wikis are characterised by a sense of anarchism, collaboration, connectivity,
organic development and self-healing, and they rely on trust. We list several
concerns about applying wikis in professional organisation. After these
concerns are met, wikis can provide a progessive, new knowledge sharing and
collaboration tool.
| [
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802.0746 | M. Evans | M. Evans | Comment: Bayesian Checking of the Second Levels of Hierarchical Models | Published in at http://dx.doi.org/10.1214/07-STS235C the Statistical
Science (http://www.imstat.org/sts/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Statistical Science 2007, Vol. 22, No. 3, 344-348 | 10.1214/07-STS235C | IMS-STS-STS235C | stat.ME | null | We discuss the methods of Evans and Moshonov [Bayesian Analysis 1 (2006)
893--914, Bayesian Statistics and Its Applications (2007) 145--159] concerning
checking for prior-data conflict and their relevance to the method proposed in
this paper. [arXiv:0802.0743]
| [
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"version": "v1",
"created": "Wed, 6 Feb 2008 07:23:14 GMT"
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] | 2009-09-29T00:00:00 | [
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802.0747 | Andrew Gelman | Andrew Gelman | Comment: Bayesian Checking of the Second Levels of Hierarchical Models | Published in at http://dx.doi.org/10.1214/07-STS235A the Statistical
Science (http://www.imstat.org/sts/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Statistical Science 2007, Vol. 22, No. 3, 349-352 | 10.1214/07-STS235A | IMS-STS-STS235A | stat.ME | null | Comment: Bayesian Checking of the Second Levels of Hierarchical Models
[arXiv:0802.0743]
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802.0748 | Takeo Hoshi | Takeo Fujiwara, Takeo Hoshi, Susumu Yamamoto | Theory of large-scale matrix computation and applications to electronic
structure calculation | 12 page, 5 figures. To appear in J. Phys. Cond. Matter. A PDF file in
better graphics is available at
http://fujimac.t.u-tokyo.ac.jp/lses/index_e.html | null | null | null | cond-mat.mtrl-sci | null | We review our recently developed methods for large-scale electronic structure
calculations, both in one-electron theory and many-electron theory. The method
are based on the density matrix representation, together with the Wannier state
representation and the Krylov subspace method, in one-electron theory of
a-few-tens nm scale systems. The hybrid method of quantum mechanical molecular
dynamical simulation is explained.The Krylov subspace method, the CG (conjugate
gradient) method and the shifted-COCG (conjugate orthogonal conjugate gradient)
method, can be applied to the investigation of the ground state and the
excitation spectra in many-electron theory. The mathematical foundation of the
Krylov subspace method for large-scale matrix computation is focused and the
key technique of the shifted-COCG method, e.g. the collinear residual and seed
switching, is explained. A wide variety of applications of these extended novel
algorithm is also explained. These are the fracture formation and propagation,
liquid carbon and formation process of gold nanowires, together with the
application to the extend Hubbard model.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 07:57:18 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Fujiwara",
"Takeo",
""
],
[
"Hoshi",
"Takeo",
""
],
[
"Yamamoto",
"Susumu",
""
]
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802.0749 | Valen E. Johnson | Valen E. Johnson | Comment: Bayesian Checking of the Second Levels of Hierarchical Models | Published in at http://dx.doi.org/10.1214/07-STS235D the Statistical
Science (http://www.imstat.org/sts/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Statistical Science 2007, Vol. 22, No. 3, 353-358 | 10.1214/07-STS235D | IMS-STS-STS235D | stat.ME | null | Comment: Bayesian Checking of the Second Levels of Hierarchical Models
[arXiv:0802.0743]
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 07:38:22 GMT"
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] | 2009-09-29T00:00:00 | [
[
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802.075 | Petr Hajicek | P. Hajicek and J. Tolar | Intrinsic and extrinsic properties of quantum systems | 20 pages, no figure. Comments are wellcome | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper attempts to convince that the orthodox interpretation of quantum
mechanics does not contradict philosophical realism by throwing light onto
certain properties of quantum systems that seem to have escaped attention as
yet. The exposition starts with the philosophical notions of realism. Then, the
quantum mechanics as it is usually taught is demoted to a mere part of the
theory called phenomenology of observations, and the common impression about
its contradiction to realism is explained. The main idea of the paper, the
physical notion of intrinsic properties, is introduced and many examples
thereof are given. It replaces the irritating dichotomy of quantum and
classical worlds by a much softer difference between intrinsic and extrinsic
properties, which concern equally microscopic and macroscopic systems. Finally,
the classicality and the quantum measurement are analyzed and found to present
some still unsolved problems. A possible way of dealing with the
Schr\"{o}dinger cat is suggested that is based on the intrinsic properties. A
simple quantum model of one classical property illustrates how our philosophy
may work.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 07:49:00 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Hajicek",
"P.",
""
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"Tolar",
"J.",
""
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802.0751 | Roman Ya. Matsyuk | Roman Ya. Matsyuk | The Variational Principle for the Uniform Acceleration and Quasi-Spin in
Two Dimensional Space-Time | 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/ Corrections:
Signs in formulae 3.17, 3.18, 3.21, 3.22, next to A.14 | SIGMA 4 (2008), 016, 11 pages | 10.3842/SIGMA.2008.016 | null | math-ph math.DG math.MP | http://creativecommons.org/licenses/by-nc-sa/3.0/ | The variational principle and the corresponding differential equation for
geodesic circles in two dimensional (pseudo)-Riemannian space are being
discovered. The relationship with the physical notion of uniformly accelerated
relativistic particle is emphasized. The known form of spin-curvature
interaction emerges due to the presence of second order derivatives in the
expression for the Lagrange function. The variational equation itself reduces
to the unique invariant variational equation of constant Frenet curvature in
two dimensional (pseudo)-Euclidean geometry.
| [
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802.0752 | Michael D. Larsen | Michael D. Larsen, Lu Lu | Comment: Bayesian Checking of the Second Level of Hierarchical Models:
Cross-Validated Posterior Predictive Checks Using Discrepancy Measures | Published in at http://dx.doi.org/10.1214/07-STS235B the Statistical
Science (http://www.imstat.org/sts/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Statistical Science 2007, Vol. 22, No. 3, 359-362 | 10.1214/07-STS235B | IMS-STS-STS235B | stat.ME | null | Comment: Bayesian Checking of the Second Level of Hierarchical Models
[arXiv:0802.0743]
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802.0753 | Dean Korosak | Sacha Jon Mooney and Dean Korosak | Using complex networks to model 2-D and 3-D soil porous architecture | This paper has been withdrawn | null | null | null | cond-mat.stat-mech cond-mat.dis-nn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper has been withdrawn by the author to comply with the journal policy
to which it has been submitted.
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] |
802.0754 | M. J. Bayarri | M. J. Bayarri, M. E. Castellanos | Rejoinder: Bayesian Checking of the Second Levels of Hierarchical Models | Published in at http://dx.doi.org/10.1214/07-STS235REJ the
Statistical Science (http://www.imstat.org/sts/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Statistical Science 2007, Vol. 22, No. 3, 363-367 | 10.1214/07-STS235REJ | IMS-STS-STS235REJ | stat.ME | null | Rejoinder: Bayesian Checking of the Second Levels of Hierarchical Models
[arXiv:0802.0743]
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 08:21:31 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Bayarri",
"M. J.",
""
],
[
"Castellanos",
"M. E.",
""
]
] | [
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] |
802.0755 | Pavel Stovicek | P. Kocabova, P. Stovicek | Propagators associated to periodic Hamiltonians: an example of the
Aharonov-Bohm Hamiltonian with two vortices | null | null | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an invariant quantum Hamiltonian $H=-\Delta_{LB}+V$ in the
$L^{2}$ space based on a Riemannian manifold $\tilde{M}$ with a discrete
symmetry group $\Gamma$. Typically, $\tilde{M}$ is the universal covering space
of a multiply connected manifold $M$ and $\Gamma$ is the fundamental group of
$M$. To any unitary representation $\Lambda$ of $\Gamma$ one can relate another
operator on $M=\tilde{M}/\Gamma$, called $H_\Lambda$, which formally
corresponds to the same differential operator as $H$ but which is determined by
quasi-periodic boundary conditions. We give a brief review of the Bloch
decomposition of $H$ and of a formula relating the propagators associated to
the Hamiltonians $H_\Lambda$ and $H$. Then we concentrate on the example of the
Aharonov-Bohm effect with two vortices. We explain in detail the construction
of the propagator in this case and indicate all essential intermediate steps.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 08:46:17 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Kocabova",
"P.",
""
],
[
"Stovicek",
"P.",
""
]
] | [
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] |
802.0756 | Marco Paggi | Alberto Carpinteri, Marco Paggi | A theoretical approach to the interaction between buckling and resonance
instabilities | 27 pages, 11 figures | null | null | null | nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with the interaction between buckling and resonance
instabilities of mechanical systems. Taking into account the effect of
geometric nonlinearity in the equations of motion through the geometric
stiffness matrix, the problem is reduced to a generalized eigenproblem where
both the loading multiplier and the natural frequency of the system are
unknown. According to this approach, all the forms of instabilities
intermediate between those of pure buckling and pure forced resonance can be
investigated. Numerous examples are analyzed, including: discrete mechanical
systems with one to n degrees of freedom, continuous mechanical systems such as
oscillating deflected beams subjected to a compressive axial load, as well as
oscillating beams subjected to lateral-torsional buckling. A general finite
element procedure is also outlined, with the possibility to apply the proposed
approach to any general bi- or tri-dimensional framed structure. The proposed
results provide a new insight in the interpretation of coupled phenomena such
as flutter instability of long-span or high-rise structures.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 09:00:05 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Carpinteri",
"Alberto",
""
],
[
"Paggi",
"Marco",
""
]
] | [
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] |
802.0757 | Kenji Kajiwara | Kenji Kajiwara and Yasuhiro Ohta | Bilinearization and Casorati determinant solution to the non-autonomous
discrete KdV equation | null | null | 10.1143/JPSJ.77.054004 | null | nlin.SI | null | Casorati determinant solution to the non-autonomous discrete KdV equation is
constructed by using the bilinear formalism. We present three different
bilinear formulations which have different origins.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 10:18:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kajiwara",
"Kenji",
""
],
[
"Ohta",
"Yasuhiro",
""
]
] | [
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] |
802.0758 | Pierre Hily-Blant | Pierre Hily-Blant (IRAM, Laog), Edith Falgarone (LERMA), Jerome Pety
(IRAM, Lerma) | Dissipative structures of diffuse molecular gas III -- Small-scale
intermittency of intense velocity-shears | Accepted for publication in A&A | null | 10.1051/0004-6361:20078423 | null | astro-ph | null | We further characterize the structures tentatively identified on thermal and
chemical grounds as the sites of dissipation of turbulence in molecular clouds
(Papers I and II). Our study is based on two-point statistics of line centroid
velocities (CV), computed from three large 12CO maps of two fields. Probability
density functions (PDF) of the CO line centroid velocity increments (CVI) over
lags varying by an order of magnitude and structure functions of the line CV,
up to the 6th order, are computed. We show that the line CV bear the three
signatures of intermittency in a turbulent velocity field: (1) the non-Gaussian
tails in the CVI PDF grow as the lag decreases, (2) the departure from
Kolmogorov scaling of the high-order structure functions is more pronounced in
the more turbulent field, (3) the positions contributing to the CVI PDF tails
delineate narrow filamentary structures (thickness ~ 0.02 pc), uncorrelated to
dense gas structures and spatially coherent with thicker ones (~0.18 pc)
observed on larger scales. The confrontation with theoretical predictions leads
us to identify these small-scale filamentary structures with extrema of
velocity-shears associated with gas warmer than the bulk. Last, their average
direction is parallel (or close) to that of the local magnetic field
projection. Turbulence in these translucent fields exhibits the statistical and
structural signatures of small-scale and inertial-range intermittency. The more
turbulent field on the 30 pc-scale is also the more intermittent on small
scales. The small-scale intermittent structures coincide with those formerly
identified as sites of enhanced dissipation. They are organized into
parsec-scale coherent structures, coupling a broad range of scales.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 09:02:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hily-Blant",
"Pierre",
"",
"IRAM, Laog"
],
[
"Falgarone",
"Edith",
"",
"LERMA"
],
[
"Pety",
"Jerome",
"",
"IRAM, Lerma"
]
] | [
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] |
802.0759 | Andrew Dancer | Andrew S. Dancer and Mckenzie Y. Wang | On Ricci solitons of cohomogeneity one | 29 pages | null | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse some properties of the cohomogeneity one Ricci soliton equations,
and use Ansatze of cohomogeneity one type to produce new explicit examples of
complete Kahler Ricci solitons of expanding, steady and shrinking types. These
solitons are foliated by hypersurfaces which are circle bundles over a product
of Fano Kahler-Einstein manifolds or over coadjoint orbits of a compact
connected semisimple Lie group.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 09:14:38 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Dancer",
"Andrew S.",
""
],
[
"Wang",
"Mckenzie Y.",
""
]
] | [
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] |
802.076 | Nicolas Brunner | Nicolas Brunner, Stefano Pironio, Antonio Acin, Nicolas Gisin, Andre
Allan Methot, and Valerio Scarani | Testing the Hilbert space dimension | 4 pages, 1 figure; Accepted for publication in PRL | Phys. Rev. Lett. 100, 210503 (2008) | 10.1103/PhysRevLett.100.210503 | null | quant-ph | null | Given a set of correlations originating from measurements on a quantum state
of unknown Hilbert space dimension, what is the minimal dimension d necessary
to describes such correlations? We introduce the concept of dimension witness
to put lower bounds on d. This work represents a first step in a broader
research program aiming to characterize Hilbert space dimension in various
contexts related to fundamental questions and Quantum Information applications.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 09:47:31 GMT"
},
{
"version": "v2",
"created": "Fri, 9 May 2008 10:25:19 GMT"
}
] | 2008-06-03T00:00:00 | [
[
"Brunner",
"Nicolas",
""
],
[
"Pironio",
"Stefano",
""
],
[
"Acin",
"Antonio",
""
],
[
"Gisin",
"Nicolas",
""
],
[
"Methot",
"Andre Allan",
""
],
[
"Scarani",
"Valerio",
""
]
] | [
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] |
802.0761 | Suresh Nampuri Mr. | Atish Dabholkar, K. Narayan and Suresh Nampuri | Degeneracy of Decadent Dyons | Some typos corrected and references added | JHEP0803:026,2008 | 10.1088/1126-6708/2008/03/026 | TIFR-TH-06-07 | hep-th | null | A quarter-BPS dyon in $\mathcal{N}=4$ super Yang-Mills theory is generically
`decadent' in that it is stable only in some regions of the moduli space and
decays on submanifolds in the moduli space. Using this fact, and from the
degeneracy of the system close to the decay, a new derivation for the
degeneracy of such dyons is given. The degeneracy obtained from these very
simple physical considerations is in precise agreement with the results
obtained from index computations in all known cases. Similar considerations
apply to dyons in $\mathcal{N}=2$ gauge theories. The relation between the
$\mathcal{N} =4 $ field theory dyons and those counted by the Igusa cusp form
in toroidally compactified heterotic string is elucidated.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 20:35:24 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 20:11:54 GMT"
}
] | 2017-09-07T00:00:00 | [
[
"Dabholkar",
"Atish",
""
],
[
"Narayan",
"K.",
""
],
[
"Nampuri",
"Suresh",
""
]
] | [
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] |
802.0762 | Ann E. Nelson | A. E. Nelson and J. Walsh | Chameleon Vector Bosons | 10 pages | Phys.Rev.D77:095006,2008 | 10.1103/PhysRevD.77.095006 | null | hep-ph astro-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that for a force mediated by a vector particle coupled to a conserved
U(1) charge, the apparent range and strength can depend on the size and density
of the source, and the proximity to other sources. This "chameleon" effect is
due to screening from a light charged scalar. Such screening can weaken
astrophysical constraints on new gauge bosons. As an example we consider the
constraints on chameleonic gauged B-L. We show that although Casimir
measurements greatly constrain any B-L force much stronger than gravity with
range longer than 0.1 microns, there remains an experimental window for a long
range chameleonic B-L force. Such a force could be much stronger than gravity,
and long or infinite range in vacuum, but have an effective range near the
surface of the earth which is less than a micron.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 09:50:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nelson",
"A. E.",
""
],
[
"Walsh",
"J.",
""
]
] | [
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802.0763 | Ivan Arzhantsev | Ivan V. Arzhantsev | On factoriality of Cox rings | 7 pages | Mat. Zametki 85:5 (2009), 643--651; transl. in Math. Notes 85:5
(2009), 623--629 | null | null | math.AG math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generalized Cox's construction associates with an algebraic variety a
remarkable invariant -- its total coordinate ring, or Cox ring. In this note we
give a new proof of factoriality of the Cox ring when the divisor class group
of the variety is finitely generated and free. The proof is based on a notion
of graded factoriality. We show that if the divisor class group has torsion,
then the Cox ring is again factorially graded, but factoriality may be lost.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 09:51:30 GMT"
}
] | 2009-08-22T00:00:00 | [
[
"Arzhantsev",
"Ivan V.",
""
]
] | [
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] |
802.0764 | Gerhard Roehrle | J. Matthew Douglass and Gerhard Roehrle | The Steinberg Variety and Representations of Reductive Groups | 37 pages; significant revision and extension; to appear in J. Algebra | null | null | null | math.RT math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an overview of some of the main results in geometric representation
theory that have been proved by means of the Steinberg variety. Steinberg's
insight was to use such a variety of triples in order to prove a conjectured
formula by Grothendieck.
The Steinberg variety was later used to give an alternative approach to
Springer's representations and played a central role in the proof of the
Deligne-Langlands conjecture for Hecke algebras by Kazhdan and Lusztig.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 09:58:33 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 08:44:18 GMT"
},
{
"version": "v3",
"created": "Mon, 16 Jun 2008 14:25:29 GMT"
},
{
"version": "v4",
"created": "Sat, 25 Oct 2008 17:42:48 GMT"
}
] | 2008-10-25T00:00:00 | [
[
"Douglass",
"J. Matthew",
""
],
[
"Roehrle",
"Gerhard",
""
]
] | [
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0.0326512642,
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] |
802.0765 | Endre Cs\'aki | Endre Cs\'aki, Ant\'onia F\"oldes, P\'al R\'ev\'esz | On the local time of the asymmetric Bernoulli walk | null | null | null | null | math.PR | http://creativecommons.org/licenses/by/3.0/ | We study some properties of the local time of the asymmetric Bernoulli walk
on the line. These properties are very similar to the corresponding ones of the
simple symmetric random walks in higher ($d\geq3$) dimension, which we
established in the recent years. The goal of this paper is to highlight these
similarities.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 10:02:07 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Csáki",
"Endre",
""
],
[
"Földes",
"Antónia",
""
],
[
"Révész",
"Pál",
""
]
] | [
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802.0766 | Massimiliano Laddomada Ph.D. | F. Daneshgaran, M. Laddomada, F. Mesiti, and M. Mondin | Modelling and Analysis of the Distributed Coordination Function of IEEE
802.11 with Multirate Capability | Accepted at IEEE WCNC 2008, Las Vegas | null | 10.1109/WCNC.2008.242 | null | cs.NI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is twofold. On one hand, it presents a
multi-dimensional Markovian state transition model characterizing the behavior
at the Medium Access Control (MAC) layer by including transmission states that
account for packet transmission failures due to errors caused by propagation
through the channel, along with a state characterizing the system when there
are no packets to be transmitted in the queue of a station (to model
non-saturated traffic conditions). On the other hand, it provides a throughput
analysis of the IEEE 802.11 protocol at the data link layer in both saturated
and non-saturated traffic conditions taking into account the impact of both
transmission channel and multirate transmission in Rayleigh fading environment.
Simulation results closely match the theoretical derivations confirming the
effectiveness of the proposed model.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 10:04:13 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Daneshgaran",
"F.",
""
],
[
"Laddomada",
"M.",
""
],
[
"Mesiti",
"F.",
""
],
[
"Mondin",
"M.",
""
]
] | [
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] |
802.0767 | Hamid Reza Sepangi | N. Khosravi and H. R. Sepangi | A fundamental length as a candidate for dark energy: a DSR inspired FRW
spacetime | 8 pages, to appear in PLA | Phys. Lett. A 372 (2008) 3356 - 3359 | 10.1016/j.physleta.2008.02.007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the existence of a fundamental length, introduced in Deformed
Special Relativity (DSR) inspired minisuper (phase-) space, causes the behavior
of the scale factor of the universe to change from that of a universe filled
with dust to an accelerating universe driven by a cosmological constant.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 10:06:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Khosravi",
"N.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | [
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] |
802.0768 | Asesh Roy Chowdhury | Dibakar Ghosh, Santo Banerjee, and A. Roy Chowdhury | Synchronization between variable time delayed systems and cryptography | 9 pages,3 figures. Submitted to EPL | null | null | null | nlin.CD nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we consider a prototype model which is described as an
autonomous continuous time delayed differential equation with just one
variable. The chaos has been investigated with variable delay time and the
synchronization phenomenon is examined both numerically and analytically using
the Krasovskii-Lyapunov functions. We have applied adaptive coupling law for
synchronization,where the coupling equation also contains delay with modulated
time. We also studied the effect of cryptography for this coupled system and
the message extraction procedure is illustrated with the help of simulated
results.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 10:10:50 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Ghosh",
"Dibakar",
""
],
[
"Banerjee",
"Santo",
""
],
[
"Chowdhury",
"A. Roy",
""
]
] | [
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] |
802.0769 | Allen Caldwell | Allen Caldwell | Behavior of sigma(gamma p) at Large Coherence Lengths | 34 pages, 20 figures | null | null | null | hep-ph | null | Various parametrizations of sigma(gamma p) are tried out on the small-x fixed
target and HERA data. A two-Pomeron type parametrization is found to give the
best reproduction of the data. The data indicate that the value of lambda(eff)
for parametrizations of the form sigma(gamma p)~l^lambda(eff) approaches a
constant value at high Q^2. The extrapolated values of sigma(gamma p) to very
long coherence lengths are found to cross in some parametrizations for l>10^7
fm, indicating the possibility that sigma(gamma p) becomes Q^2 independent at
large values of the coherence length l.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 12:56:51 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Caldwell",
"Allen",
""
]
] | [
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] |
802.077 | Yu-Ying Zhang | Y.-Y. Zhang, A. Finoguenov, H. Boehringer, J.-P. Kneib, G. P. Smith,
R. Kneissl, N. Okabe, and H. Dahle | LoCuSS: Comparison of Observed X-ray and Lensing Galaxy Cluster Scaling
Relations with Simulations | 56 pages, 32 figure, 2008A&A...482..451Z, typos corrected in Table
A.1 | null | 10.1051/0004-6361:20079103 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Local Cluster Substructure Survey (LoCuSS, Smith et al.) is a systematic
multi-wavelength survey of >100 X-ray luminous galaxy clusters (0.14<z<0.3)
selected from the ROSAT all sky survey. We used data on 37 LoCuSS clusters from
the XMM-Newton archive to investigate the global scaling relations of galaxy
clusters. The scaling relations based solely on the X-ray data obey empirical
self-similarity and reveal no additional evolution beyond the LSS growth. Weak
lensing mass measurements are also available in the literature for 19 of the
clusters with XMM-Newton data. The average of the weak lensing mass to X-ray
based mass ratio is 1.09+/-8, setting the limit of the non-thermal pressure
support to 9+/-8%. The mean of the weak lensing mass to X-ray based mass ratio
of these clusters is ~1 with 31-51% scatter. The scatter in the
mass--observable relations (M-Y_X, M-M_{gas} and M-T) is smaller using X-ray
based masses than using weak lensing masses by a factor of 2. Using the scaled
radius defined by the Y_X profile, we obtain lower scatter in the weak lensing
mass based mass--observable relations. The normalization of the M-Y_X relation
(also M-M_{gas} and M-T relations) using X-ray (weak lensing) mass estimates is
lower than the one from simulations by up to 20% at ~3 sigma (~2 sigma)
significance. Despite the large scatter in the X-ray to lensing comparison, the
agreement between these two completely independent observational methods is an
important step towards controlling astrophysical and measurement systematics in
cosmological scaling relations.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 10:54:19 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 12:11:20 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Mar 2008 08:20:38 GMT"
},
{
"version": "v4",
"created": "Fri, 14 Nov 2008 11:47:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhang",
"Y. -Y.",
""
],
[
"Finoguenov",
"A.",
""
],
[
"Boehringer",
"H.",
""
],
[
"Kneib",
"J. -P.",
""
],
[
"Smith",
"G. P.",
""
],
[
"Kneissl",
"R.",
""
],
[
"Okabe",
"N.",
""
],
[
"Dahle",
"H.",
""
]
] | [
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] |
802.0771 | A. Nihat Berker | Can G\"uven, A. Nihat Berker, Michael Hinczewski, and Hidetoshi
Nishimori | Reentrant and Forward Phase Diagrams of the Anisotropic
Three-Dimensional Ising Spin Glass | Added 7 more references. Published version. 7 pages, 7 figures, 1
table | Phys. Rev. E 77, 061110 (2008) | 10.1103/PhysRevE.77.061110 | null | cond-mat.dis-nn cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spatially uniaxially anisotropic d=3 Ising spin glass is solved exactly
on a hierarchical lattice. Five different ordered phases, namely ferromagnetic,
columnar, layered, antiferromagnetic, and spin-glass phases, are found in the
global phase diagram. The spin-glass phase is more extensive when randomness is
introduced within the planes than when it is introduced in lines along one
direction. Phase diagram cross-sections, with no Nishimori symmetry, with
Nishimori symmetry lines, or entirely imbedded into Nishimori symmetry, are
studied. The boundary between the ferromagnetic and spin-glass phases can be
either reentrant or forward, that is either receding from or penetrating into
the spin-glass phase, as temperature is lowered. However, this boundary is
always reentrant when the multicritical point terminating it is on the
Nishimori symmetry line.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 10:56:57 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Feb 2009 11:11:49 GMT"
}
] | 2009-02-23T00:00:00 | [
[
"Güven",
"Can",
""
],
[
"Berker",
"A. Nihat",
""
],
[
"Hinczewski",
"Michael",
""
],
[
"Nishimori",
"Hidetoshi",
""
]
] | [
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] |
802.0772 | Jens Chluba | R.A. Sunyaev and J. Chluba | The Richness and Beauty of the Physics of Cosmological Recombination:
The Contributions from Helium | 16 pages, 11 figures, proceedings of the conference: "A Century of
Cosmology: Past, Present and Future" | Nuovo Cim.B122:919-934,2007 | 10.1393/ncb/i2008-10429-6 | null | astro-ph | null | The physical ingredients to describe the epoch of cosmological recombination
are amazingly simple and well-understood. This fact allows us to take into
account a very large variety of processes, still finding potentially measurable
consequences. In this contribution we highlight some of the detailed physics
that were recently studied in connection with cosmological hydrogen and helium
recombination. The impact of these considerations is two-fold: (i) the
associated release of photons during this epoch leads to interesting and unique
deviations of the Cosmic Microwave Background (CMB) energy spectrum from a
perfect blackbody, which, in particular at decimeter wavelength, may become
observable in the near future. Despite the fact that the abundance of helium is
rather small, it also contributes a sizeable amount of photons to the full
recombination spectrum, which, because of differences in the dynamics of the
helium recombinations and the non-trivial superposition of all components, lead
to additional distinct spectral features. Observing the spectral distortions
from the epochs of hydrogen and helium recombination, in principle would
provide an additional way to determine some of the key parameters of the
Universe (e.g. the specific entropy, the CMB monopole temperature and the
pre-stellar abundance of helium), not suffering from limitations set by cosmic
variance. Also it permits us to confront our detailed understanding of the
recombination process with direct observational evidence. (ii) with the advent
of high precision CMB data, e.g. as will be available using the Planck Surveyor
or CMBpol, a very accurate theoretical understanding of the ionization history
of the Universe becomes necessary for the interpretation of the CMB temperature
and polarization anisotropies. (abridged)
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 11:14:32 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Sunyaev",
"R. A.",
""
],
[
"Chluba",
"J.",
""
]
] | [
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] |
802.0773 | Thomas Wiegelmann | L. Feng, B. Inhester, S. K. Solanki, T. Wiegelmann, B. Podlipnik, R.
A. Howard, J.-P. Wuelser | First Stereoscopic Coronal Loop Reconstructions from Stereo Secchi
Images | 6 pages, 5 figures | 2007ApJ...671L.205F | 10.1086/525525 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first reconstruction of the three-dimensional shape of
magnetic loops in an active region from two different vantage points based on
simultaneously recorded images. The images were taken by the two EUVI
telescopes of the SECCHI instrument onboard the recently launched STEREO
spacecraft when the heliocentric separation of the two space probes was 12
degrees. We demostrate that these data allow to obtain a reliable
three-dimensional reconstruction of sufficiently bright loops. The result is
compared with field lines derived from a coronal magnetic field model
extrapolated from a photospheric magnetogram recorded nearly simultaneously by
SOHO/MDI. We attribute discrepancies between reconstructed loops and
extrapolated field lines to the inadequacy of the linear force-free field model
used for the extrapolation.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 11:05:28 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Feng",
"L.",
""
],
[
"Inhester",
"B.",
""
],
[
"Solanki",
"S. K.",
""
],
[
"Wiegelmann",
"T.",
""
],
[
"Podlipnik",
"B.",
""
],
[
"Howard",
"R. A.",
""
],
[
"Wuelser",
"J. -P.",
""
]
] | [
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] |
802.0774 | Yiannis Tsamis | Y. G. Tsamis (1 and 2), J. R. Walsh (2), D. P\'equignot (3), M. J.
Barlow (1), I. J. Danziger (4), and X.-W. Liu (5) ((1) UCL, (2) ECF-ESO, (3)
Meudon, (4) Trieste, (5) Beijing) | Integral field spectroscopy of planetary nebulae: mapping the line
diagnostics and hydrogen-poor zones with VLT FLAMES | 27 pages, 18 figures (the resolution of some figures has been
reduced); Accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc. 386 (2008) 22-46 | 10.1111/j.1365-2966.2008.13051.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | (Abridged) Results from the first dedicated study of Galactic PNe by means of
optical integral field spectroscopy with the VLT FLAMES Argus IFU are
presented. Three typical Galactic-disk PNe have been mapped with the
11.5''x7.2'' Argus array: two dimensional spectral maps of NGC 5882, 6153 and
7009 with 297 spatial pixels per target were obtained at sub-arcsec resolutions
and 297 spectra per target were obtained in the 396.4-507.8 nm range. Spatially
resolved maps of emission lines and of nebular physical properties were
produced. The abundances of helium and of doubly ionized carbon and oxygen were
derived from optical recombination lines (ORLs), while those of O^2+ were also
derived from the collisionally excited lines (CELs). The abundance discrepancy
problem was investigated by mapping the ratio of ORL/CEL abundances for O^2+
(the abundance discrepancy factor; ADF) across the face of the PNe. The ADF
varies between targets and also with position within the targets attaining
values of ~40 in the case of NGC 6153. Correlations of the ADF with geometric
distance from the nucleus, as well as with [O III] electron temperature, plasma
ionization state and other physical properties are established. Very small
values of the temperature fluctuation parameter in the plane of the sky are
found in all cases. It is argued that these results provide further evidence
for the existence in typical PNe of a distinct nebular component consisting of
hydrogen-deficient plasma. The zones containing this posited component appear
as undulations in the C II and C II ORL abundance diagnostics of about 2
spatial pixels across; any associated structures should have physical sizes of
less than ~1000 astronomical units. We propose that circumstellar disks, Abell
30-type knots, or Helix-type cometary globules may be involved.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 11:09:57 GMT"
}
] | 2008-07-27T00:00:00 | [
[
"Tsamis",
"Y. G.",
"",
"1 and 2"
],
[
"Walsh",
"J. R.",
""
],
[
"Péquignot",
"D.",
""
],
[
"Barlow",
"M. J.",
""
],
[
"Danziger",
"I. J.",
""
],
[
"Liu",
"X. -W.",
""
]
] | [
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] |
802.0775 | Ed Threlfall | Nick Evans and Ed Threlfall | Mesonic quasinormal modes of the Sakai-Sugimoto model at high
temperature | 7 pages with 6 eps figures, typos corrected | Phys.Rev.D77:126008,2008 | 10.1103/PhysRevD.77.126008 | NI-08-006, SHEP-08-07 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the mesonic thermal spectrum of the Sakai-Sugimoto model of
holographic QCD by finding the quasinormal frequencies of the supergravity
dual. If flavour is added using D8 and anti-D8 branes there exist embeddings
where the D-brane worldvolume contains a black hole. For these embeddings (the
high-temperature phase of the Sakai-Sugimoto model) we determine the
quasinormal spectra of scalar and vector mesons arising from the worldvolume
DBI action of the D-brane. We stress the importance of a coordinate change that
makes the in-falling quasinormal modes regular at the horizon allowing a simple
numerical shooting technique. Finally we examine the effect of finite spatial
momentum on quasinormal spectra.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 11:12:50 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Apr 2008 12:59:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Evans",
"Nick",
""
],
[
"Threlfall",
"Ed",
""
]
] | [
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-0.0105285002,
0.0393961333,
0.040923316,
0.0318896398,
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] |
802.0776 | Aitor del Coso | Aitor del Coso and Sebastien Simoens | Distributed Compression for the Uplink of a Backhaul-Constrained
Coordinated Cellular Network | 30 pages, 6 figures, Submitted to IEEE Trans on signal Processing | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a backhaul-constrained coordinated cellular network. That is, a
single-frequency network with $N+1$ multi-antenna base stations (BSs) that
cooperate in order to decode the users' data, and that are linked by means of a
common lossless backhaul, of limited capacity $\mathrm{R}$. To implement
receive cooperation, we propose distributed compression: $N$ BSs, upon
receiving their signals, compress them using a multi-source lossy compression
code. Then, they send the compressed vectors to a central BS, which performs
users' decoding. Distributed Wyner-Ziv coding is proposed to be used, and is
optimally designed in this work. The first part of the paper is devoted to a
network with a unique multi-antenna user, that transmits a predefined Gaussian
space-time codeword. For such a scenario, the compression codebooks at the BSs
are optimized, considering the user's achievable rate as the performance
metric. In particular, for $N = 1$ the optimum codebook distribution is derived
in closed form, while for $N>1$ an iterative algorithm is devised. The second
part of the contribution focusses on the multi-user scenario. For it, the
achievable rate region is obtained by means of the optimum compression
codebooks for sum-rate and weighted sum-rate, respectively.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 11:19:02 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"del Coso",
"Aitor",
""
],
[
"Simoens",
"Sebastien",
""
]
] | [
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] |
802.0777 | Niklas Beisert | Niklas Beisert, Peter Koroteev | Quantum Deformations of the One-Dimensional Hubbard Model | 58 pages, v2: comments on Alcaraz-Bariev cases A+- extended,
references added, v3: addresses corrected | J.Phys.A41:255204,2008 | 10.1088/1751-8113/41/25/255204 | AEI-2008-003, ITEP-TH-06/08 | hep-th cond-mat.str-el math.QA | null | The centrally extended superalgebra psu(2|2)xR^3 was shown to play an
important role for the integrable structures of the one-dimensional Hubbard
model and of the planar AdS/CFT correspondence. Here we consider its quantum
deformation U_q(psu(2|2)xR^3) and derive the fundamental R-matrix. From the
latter we deduce an integrable spin chain Hamiltonian with three independent
parameters and the corresponding Bethe equations to describe the spectrum on
periodic chains. We relate our Hamiltonian to a two-parametric Hamiltonian
proposed by Alcaraz and Bariev which can be considered a quantum deformation of
the one-dimensional Hubbard model.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:24:52 GMT"
},
{
"version": "v2",
"created": "Mon, 31 Mar 2008 11:52:42 GMT"
},
{
"version": "v3",
"created": "Wed, 21 May 2008 12:47:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Beisert",
"Niklas",
""
],
[
"Koroteev",
"Peter",
""
]
] | [
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] |
802.0778 | Endre Cs\'aki | Endre Cs\'aki, Ant\'onia F\"oldes, P\'al R\'ev\'esz | Transient nearest neighbor random walk and Bessel process | null | null | null | null | math.PR | http://creativecommons.org/licenses/by/3.0/ | We prove strong invariance principle between a transient Bessel process and a
certain nearest neighbor (NN) random walk that is constructed from the former
by using stopping times. It is also shown that their local times are close
enough to share the same strong limit theorems. It is shown furthermore, that
if the difference between the distributions of two NN random walks are small,
then the walks themselves can be constructed so that they are close enough.
Finally, some consequences concerning strong limit theorems are discussed.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 11:26:12 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Csáki",
"Endre",
""
],
[
"Földes",
"Antónia",
""
],
[
"Révész",
"Pál",
""
]
] | [
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] |
802.0779 | Ilya Beterov | I. Sydoryk, N.N. Bezuglov, I.I. Beterov, K. Miculis, E. Saks, A.
Janovs, P. Spels, A. Ekers | Broadening and intensity redistribution in the Na($3p$) hyperfine
excitation spectra due to optical pumping in the weak excitation limit | 12 pages, 10 figures | Physical Review A 77, 042511 (2008) | 10.1103/PhysRevA.77.042511 | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detailed analysis of spectral line broadening and variations in relative
intensities of hyperfine spectral components due to optical pumping is
presented. Hyperfine levels of sodium $3p_{1/2}$ and $3p_{3/2}$ levels are
selectively excited in a supersonic beam at various laser intensities under the
conditions when optical pumping time is shorter than transit time of atoms
through the laser beam. The excitation spectra exhibit significant line
broadening at laser intensities well below the saturation intensity, and
redistribution of intensities of hyperfine spectral components is observed,
which in some cases is contradicting with intuitive expectations. Theoretical
analysis of the dynamics of optical pumping shows that spectral line broadening
depends sensitively on branching coefficient of the laser-driven transition.
Analytical expressions for branching ratio dependent critical Rabi frequency
and critical laser intensity are derived, which give the threshold for onset of
noticeable line broadening by optical pumping. Transitions with larger and
smaller branching coefficients are relatively less affected. The theoretical
excitation spectra were calculated numerically by solving density matrix
equations of motion using the split propagation technique, and they well
reproduce the observed effects of line broadening and peak intensity
variations. The calculations also show that presence of dark (i.e., not laser-
coupled) Zeeeman sublevels in the lower state results in effective branching
coefficients which vary with laser intensity and differ from those implied by
the sum rules, and this can lead to peculiar changes in peak ratios of
hyperfine components of the spectra.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 11:35:41 GMT"
}
] | 2009-04-14T00:00:00 | [
[
"Sydoryk",
"I.",
""
],
[
"Bezuglov",
"N. N.",
""
],
[
"Beterov",
"I. I.",
""
],
[
"Miculis",
"K.",
""
],
[
"Saks",
"E.",
""
],
[
"Janovs",
"A.",
""
],
[
"Spels",
"P.",
""
],
[
"Ekers",
"A.",
""
]
] | [
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] |
802.078 | Andras Suto | Andras Suto and Peter Szepfalusy | Variational wave functions for homogenous Bose systems | null | Phys. Rev. A 77, 023606 (2008) | 10.1103/PhysRevA.77.023606 | null | cond-mat.stat-mech math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study variational wave functions of the product form, factorizing
according to the wave vectors k, for the ground state of a system of bosons
interacting via positive pair interactions with a positive Fourier transform.
Our trial functions are members of different orthonormal bases in Fock space.
Each basis contains a quasiparticle vacuum state and states with an arbitrary
finite number of quasiparticles. One of the bases is that of Valatin and Butler
(VB), introduced fifty years ago and parametrized by an infinite set of
variables determining Bogoliubov's canonical transformation for each k. In
another case, inspired by Nozi\`eres and Saint James the canonical
transformation for k=0 is replaced by a shift in the creation/annihilation
operators. For the VB basis we prove that the lowest energy is obtained in a
state with ~sqrt{volume} quasiparticles in the zero mode. The number of k=0
physical particles is of the order of the volume and its fluctuation is
anomalously large, resulting in an excess energy. The same fluctuation is
normal in the second type of optimized bases, the minimum energy is smaller and
is attained in a vacuum state. Associated quasiparticle theories and questions
about the gap in their spectrum are also discussed.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 11:48:52 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Suto",
"Andras",
""
],
[
"Szepfalusy",
"Peter",
""
]
] | [
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] |
802.0781 | Prasanta K. Panigrahi | Sreraman Muralidharan, Prasanta K. Panigrahi | Quantum information splitting using multi-partite cluster states | 7 Pages | null | 10.1103/PhysRevA.78.062333 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide various schemes for the splitting up of Quantum information into
parts using the four and five partite cluster states. Explicit protocols for
the Quantum information splitting (QIS) of single and two qubit states are
illustrated. It is found that the four partite cluster state can be used for
the QIS of an entangled state and the five partite cluster state can be used
for QIS of an arbitrary two qubit state. The schemes considered here are also
secure against certain eavesdropping attacks.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 12:11:48 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Nov 2008 04:11:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Muralidharan",
"Sreraman",
""
],
[
"Panigrahi",
"Prasanta K.",
""
]
] | [
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] |
802.0782 | Pekka Alitalo | Pekka Alitalo, Olli Luukkonen, Joni Vehmas, Sergei Tretyakov | Impedance-matched microwave lens | 11 pages, 8 figures | IEEE Antennas and Wireless Propagation Letters, vol. 7, pp.
187-191, 2008. | 10.1109/LAWP.2008.920906 | null | physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A microwave lens with highly reduced reflectance, as compared to conventional
dielectric lenses, is proposed. The lens is based on two-dimensional or
three-dimensional transmission-line networks that can be designed to have an
effective refractive index larger than one, while having almost perfect
impedance matching with free space. The design principles are presented and an
example lens is studied using commercial simulation software.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 12:34:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alitalo",
"Pekka",
""
],
[
"Luukkonen",
"Olli",
""
],
[
"Vehmas",
"Joni",
""
],
[
"Tretyakov",
"Sergei",
""
]
] | [
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] |
802.0783 | S\'ergio Sousa | S. G. Sousa and M. S. Cunha | On mode conversion and wave reflection in magnetic Ap stars | 13 pages, 12 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13062.x | null | astro-ph | null | We investigate the effect of a strong large scale magnetic field on the
reflection of high frequency acoustic modes in rapidly oscillating Ap stars. To
that end we consider a toy model composed of an isothermal atmosphere matched
onto a polytropic interior and determine the numerical solution to the set of
ideal magneto-hydrodynamic equations in a local plane-parallel approximation
with constant gravity. Using the numerical solution in combination with
approximate analytical solutions that are valid in the limits where the
magnetic and acoustic components are decoupled, we calculate the relative
fraction of energy flux that is carried away in each oscillation cycle by
running acoustic waves in the atmosphere and running magnetic waves in the
interior. For oscillation frequencies above the acoustic cutoff we show that
most energy losses associated with the presence of running waves occur in
regions where the magnetic field is close to vertical. Moreover, by considering
the depth dependence of the energy associated with the magnetic component of
the wave in the atmosphere we show that a fraction of the wave energy is kept
in the oscillation every cycle. For frequencies above the acoustic cutoff
frequency such energy is concentrated in regions where the magnetic field is
significantly inclined in relation to the local vertical. Even though our
calculations were aimed at studying oscillations with frequencies above the
acoustic cutoff frequency, based on our results we discuss what results may be
expected for oscillations of lower frequency.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:03:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sousa",
"S. G.",
""
],
[
"Cunha",
"M. S.",
""
]
] | [
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] |
802.0784 | Stoytcho Yazadjiev | Stoytcho S. Yazadjiev | Magnetized static black Saturn | LaTex, 9 pages | Phys.Rev.D77:127501,2008 | 10.1103/PhysRevD.77.127501 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a new static solution to the 5D Einstein-Maxwell equations
describing a static black hole surrounded by a non-rotating dipole black ring.
The configuration is kept in equilibrium by an external magnetic field
interacting with the dipole charge of the black ring. The properties of the
black Saturn-like configuration are studied and the basic physical quantities
are calculated. The solution demonstrates 2-fold continuous non-uniqueness of
the 5D magnetized static neutral black objects for fixed total mass and Melvin
background.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 12:55:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | [
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] |
802.0785 | Chikoo Oosawa | Chikoo Oosawa, Michael A. Savageau, Abdul S. Jarrah, Reinhard C.
Laubenbacher, Eduardo D. Sontag | Stabilizing and Destabilizing Effects of Embedding 3-node Subgraphs on
State Space of Boolean Networks | 5 figures, 2 tables. accepted in ACRI2008, to appear in Lecture Notes
in Computer Science | LNCS 5191 pp.100-107 (2008) | null | null | nlin.CG nlin.AO | null | We demonstrate the effects of embedding subgraphs using a Boolean network,
which is one of the discrete dynamical models for transcriptional regulatory
networks. After comparing the dynamical properties of network embedded seven
different subgraphs including feedback and feedforward subgraphs, we found that
complexity of the state space that increases with longer length of attractors
and greater number of attractors is reduced for networks with more feedforward
subgraphs. In addition, feedforward subgraphs can also provide higher mutual
information with lower entropy in a temporal program of gene expression.
Networks with other six subgraphs show opposite effects on dynamics of the
networks, is roughly consistent with Thomas's conjecture. These results suggest
that feedforward subgraphs are one of the favorable local structures in
biological complex networks.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 12:56:59 GMT"
},
{
"version": "v2",
"created": "Sat, 9 Feb 2008 15:37:15 GMT"
},
{
"version": "v3",
"created": "Sun, 4 May 2008 15:38:13 GMT"
}
] | 2008-06-26T00:00:00 | [
[
"Oosawa",
"Chikoo",
""
],
[
"Savageau",
"Michael A.",
""
],
[
"Jarrah",
"Abdul S.",
""
],
[
"Laubenbacher",
"Reinhard C.",
""
],
[
"Sontag",
"Eduardo D.",
""
]
] | [
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] |
802.0786 | Ulrich Mosel | Ulrich Mosel | Chiral Symmetry in Nuclei -- Theoretical Expectations and Hard Facts | Invited Talk at Chiral07, Osaka, Japan, Nov. 13 - 16, 2007 | Mod.Phys.Lett.A23:2371-2380,2008 | 10.1142/S0217732308029411 | null | hep-ph nucl-ex nucl-th | null | It is widely believed that chiral symmetry is restored not only at high
temperatures, but also at high nuclear densities. The drop of the order
parameter of the chiral phase transition, the chiral condensate, with density
has indeed been calculated in various models and is as such a rather robust
result. In this talk I point out that the connection of this property with
actual observables is far less clear. For this task a good hadronic description
of the primary production of hadrons, their propagation inside the nuclear
medium, their decay and the propagation of the decay products through the
medium to the detector all have to be treated with equal accuracy and weight.
In this talk I illustrate with the examples of $\omega$ production and
$\pi^0\pi^0$ production how important in particular final state interactions
are.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:17:24 GMT"
}
] | 2009-01-30T00:00:00 | [
[
"Mosel",
"Ulrich",
""
]
] | [
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] |
802.0787 | Andrea Lapi | A. Lapi (1,2), N. Kawakatu (3,2), Z. Bosnjak (4,2), A. Celotti (2,5),
A. Bressan (6,2,7), G.L. Granato (6) and L. Danese (2) (1-Univ. "Tor
Vergata", Rome, Italy; 2-SISSA/ISAS, Trieste, Italy; 3-NAOJ, Tokio, Japan;
4-IAP, Paris, France; 5-INFN, Trieste, Italy; 6-INAF, Padova, Italy; 7-INAOE,
Puebla, Mexico) | Long Gamma-Ray Bursts and Their Host Galaxies at High Redshift | 11 pages, 8 figures, uses mn2e.cls. Minor changes. In press on MNRAS | Mon. Not. Roy. Astron. Soc. 386 (2008) 608 | 10.1111/j.1365-2966.2008.13076.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent observational and theoretical evidence that long
Gamma-Ray Bursts (GRBs) are likely associated with low metallicity, rapidly
rotating massive stars, we examine the cosmological star formation rate (SFR)
below a critical metallicity Z_crit Z_sun/10 - Z_sun/5, to estimate the event
rate of high-redshift long GRB progenitors. To this purpose, we exploit a
galaxy formation scenario already successfully tested on a wealth of
observational data on (proto)spheroids, Lyman break galaxies, Lyman alpha
emitters, submm galaxies, quasars, and local early-type galaxies. We find that
the predicted rate of long GRBs amounts to about 300 events/yr/sr, of which
about 30 per cent occur at z>~6. Correspondingly, the GRB number counts well
agree with the bright SWIFT data, without the need for an intrinsic luminosity
evolution. Moreover, the above framework enables us to predict properties of
the GRB host galaxies. Most GRBs are associated with low mass galaxy halos
M_H<~10^11 M_sun, and effectively trace the formation of small galaxies in such
halos. The hosts are young, with age smaller than 5*10^7 yr, gas rich, but
poorly extincted (A_V<~0.1) because of their chemical immaturity; this also
implies high specific SFR and quite extreme alpha-enhancement. Only the
minority of hosts residing in large halos with M_H>~10^12 M_sun have larger
extinction (A_V~0.7-1), SFRs exceeding 100 M_sun/yr and can be detected at
submm wavelengths. Most of the hosts have UV magnitudes in the range -20
<~M_1350<~ -16, and Lyman alpha luminosity in the range 2*10^40
<~L_Lya<~2*10^42 erg/s. GRB hosts are thus tracing the faint end of the
luminosity function of Lyman break galaxies and Lyman alpha emitters.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:11:15 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Apr 2008 09:44:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lapi",
"A.",
""
],
[
"Kawakatu",
"N.",
""
],
[
"Bosnjak",
"Z.",
""
],
[
"Celotti",
"A.",
""
],
[
"Bressan",
"A.",
""
],
[
"Granato",
"G. L.",
""
],
[
"Danese",
"L.",
""
]
] | [
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] |
802.0788 | Sini R | Sini R, Nijo Varghese, V. C. Kuriakose | Quasi-normal modes of spherically symmetric black hole spacetimes with
cosmic string in a Dirac field | 16 pages, 16 figures, title, abstract and content in section 2
changed | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dirac equation for a general black hole metric having a cosmic string is
derived. The quasi-normal mode frequencies for Schwarzschild, RN extremal, SdS
and near extremal SdS black hole space-times with cosmic string perturbed by a
massless Dirac field are obtained using WKB approximation and found that in all
these cases, decay is less in black holes having cosmic string compared to
black holes with out string.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:16:29 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Sep 2008 12:27:30 GMT"
}
] | 2008-09-02T00:00:00 | [
[
"R",
"Sini",
""
],
[
"Varghese",
"Nijo",
""
],
[
"Kuriakose",
"V. C.",
""
]
] | [
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] |
802.0789 | Fatine Latif | Anton Baranov, Emmanuel Fricain (ICJ), Javad Mashreghi | Weighted norm inequalities for de Branges--Rovnyak spaces and their
applications | null | null | null | null | math.CV math.FA | null | Let $\mathcal{H}(b)$ denote the de Branges--Rovnyak space associated with a
function $b$ in the unit ball of $H^\infty(\mathbb{C}_+)$. We study the
boundary behavior of the derivatives of functions in $\mathcal{H}(b)$ and
obtain weighted norm estimates of the form $\|f^{(n)}\|_{L^2(\mu)} \le
C\|f\|_{\mathcal{H}(b)}$, where $f \in \mathcal{H}(b)$ and $\mu$ is a
Carleson-type measure on $\mathbb{C}_+\cup\mathbb{R}$. We provide several
applications of these inequalities. We apply them to obtain embedding theorems
for $\mathcal{H}(b)$ spaces. These results extend Cohn and Volberg--Treil
embedding theorems for the model (star-invariant) subspaces which are special
classes of de Branges--Rovnyak spaces. We also exploit the inequalities for the
derivatives to study stability of Riesz bases of reproducing kernels
$\{k^b_{\lambda_n}\}$ in $\mathcal{H}(b)$ under small perturbations of the
points $\lambda_n$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:18:40 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Baranov",
"Anton",
"",
"ICJ"
],
[
"Fricain",
"Emmanuel",
"",
"ICJ"
],
[
"Mashreghi",
"Javad",
""
]
] | [
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] |
802.079 | Maths Karlsson | M. Karlsson, A. Matic, C.S. Knee, I. Ahmed, S. Eriksson and L.
B\"orjesson | Short-range structure of proton conducting perovskite
BaIn_{x}Zr_{1-x}O_{3-x/2} (x = 0-0.75) | 8 pages, 4 figures | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a systematic study we investigate the effect of dopant level and hydration
on the short-range structure of the proton conducting perovskite-type oxide
BaIn_{x}Zr_{1-x}O_{3-x/2} (x = 0-0.75), using infrared and Raman spectroscopy.
The results show that doping leads to significant local distortions of the
average cubic structure of these materials. By increasing the In concentration
from x = 0 to x = 0.75 new bands appear and grow in intensity in both the IR
and Raman spectra, showing that the local distortions become successively more
and more pronounced. The structural distortions are largely uncorrelated to the
presence of oxygen vacancies, but instead are mainly driven by the size
difference between the In^{3+} and Zr^{4+} ions, which leads to displacements
of the cations and to tilting of the (In/Zr)O_{6} octahedra. Based on our
results, we suggest that there is a threshold between x = 0.10 and x = 0.25
where the local structural distortions propagate throughout the whole
perovskite structure. Comparison of our spectroscopic data with the proton
conductivity reported for the same materials indicates that the presence of
extended structural distortions are favorable for fast proton transport.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:27:42 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Karlsson",
"M.",
""
],
[
"Matic",
"A.",
""
],
[
"Knee",
"C. S.",
""
],
[
"Ahmed",
"I.",
""
],
[
"Eriksson",
"S.",
""
],
[
"Börjesson",
"L.",
""
]
] | [
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802.0791 | Adrian Tanasa | R. Gurau, J. Magnen, V. Rivasseau and A. Tanasa | A translation-invariant renormalizable non-commutative scalar model | 17 pages, 3 figures | Commun.Math.Phys.287:275-290,2009 | 10.1007/s00220-008-0658-3 | LPT ORSAY 08-23 | math-ph hep-th math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we propose a translation-invariant scalar model on the Moyal
space. We prove that this model does not suffer from the UV/IR mixing and we
establish its renormalizability to all orders in perturbation theory.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:37:22 GMT"
}
] | 2009-02-19T00:00:00 | [
[
"Gurau",
"R.",
""
],
[
"Magnen",
"J.",
""
],
[
"Rivasseau",
"V.",
""
],
[
"Tanasa",
"A.",
""
]
] | [
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] |
802.0792 | Fatine Latif | Emmanuel Fricain (ICJ), Javad Mashreghi | Integral representation of the $n$-th derivative in de Branges-Rovnyak
spaces and the norm convergence of its reproducing kernel | null | null | null | null | math.CV math.CO math.FA | null | In this paper, we give an integral representation for the boundary values of
derivatives of functions of the de Branges--Rovnyak spaces $\HH(b)$, where $b$
is in the unit ball of $H^\infty(\CC_+)$. In particular, we generalize a result
of Ahern--Clark obtained for functions of the model spaces $K_b$, where $b$ is
an inner function. Using hypergeometric series, we obtain a nontrivial formula
of combinatorics for sums of binomial coefficients. Then we apply this formula
to show the norm convergence of reproducing kernel $k_{\omega,n}^b$ of the
evaluation of $n$-th derivative of elements of $\HH(b)$ at the point $\omega$
as it tends radially to a point of the real axis.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:39:24 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Fricain",
"Emmanuel",
"",
"ICJ"
],
[
"Mashreghi",
"Javad",
""
]
] | [
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] |
802.0793 | Xavier Bry | Xavier Bry (I3M), Thomas Verron (CEFE), Pierre Cazes (CEREMADE) | A multiple covariance approach to PLS regression with several predictor
groups: Structural Equation Exploratory Regression | null | null | null | null | stat.ME math.ST stat.TH | null | A variable group Y is assumed to depend upon R thematic variable groups X 1,
>..., X R . We assume that components in Y depend linearly upon components in
the Xr's. In this work, we propose a multiple covariance criterion which
extends that of PLS regression to this multiple predictor groups situation. On
this criterion, we build a PLS-type exploratory method - Structural Equation
Exploratory Regression (SEER) - that allows to simultaneously perform dimension
reduction in groups and investigate the linear model of the components. SEER
uses the multidimensional structure of each group. An application example is
given.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:40:03 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 09:00:04 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Bry",
"Xavier",
"",
"I3M"
],
[
"Verron",
"Thomas",
"",
"CEFE"
],
[
"Cazes",
"Pierre",
"",
"CEREMADE"
]
] | [
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] |
802.0794 | Xavier Bry | Xavier Bry (I3M), Thomas Verron (CEFE) | Mod\'elisation factorielle des interactions entre deux ensembles
d'observations : la m\'ethode PLS-FILM (Partial Least Squares Factor
Interaction Linear Modelling) | null | null | null | null | stat.ME math.ST stat.TH | null | In this work, we consider a data array encoding interactions between two sets
of observations respectively referred to as "subjects" and "objects". Besides,
descriptions of subjects and objects are available through two variable sets.
We propose a geometrically grounded exploratory technique to analyze the
interactions using descriptions of subjects and objects: interactions are
modelled using a hierarchy of subject-factors and object-factors built up from
these descriptions. Our method bridges the gap between those of Chessel (RLQ
analysis) and Martens (L-PLS), although it only has rank 1 components in common
with them.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:40:42 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Bry",
"Xavier",
"",
"I3M"
],
[
"Verron",
"Thomas",
"",
"CEFE"
]
] | [
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] |
802.0795 | Jean-Marc Luck | Y. Avishai, J.M. Luck | Tight-binding electronic spectra on graphs with spherical topology. II.
The effect of spin-orbit interaction | 25 pages, 15 figures, 12 tables. Various kinds of minor improvements | J. Stat. Mech. (2008) P06008 | 10.1088/1742-5468/2008/06/P06008 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the second of two papers devoted to tight-binding electronic spectra
on graphs with the topology of the sphere. We investigate the problem of an
electron subject to a spin-orbit interaction generated by the radial electric
field of a static point charge sitting at the center of the sphere. The
tight-binding Hamiltonian considered is a discretization on polyhedral graphs
of the familiar form ${\bm L}\cdot{\bm S}$ of the spin-orbit Hamiltonian. It
involves SU(2) hopping matrices of the form $\exp({\rm i}\mu{\bm
n}\cdot{\bm\sigma})$ living on the oriented links of the graph. For a given
structure, the dimensionless coupling constant $\mu$ is the only parameter of
the model. An analysis of the energy spectrum is carried out for the five
Platonic solids (tetrahedron, cube, octahedron, dodecahedron and icosahedron)
and the C$_{60}$ fullerene. Except for the latter, the $\mu$-dependence of all
the energy levels is obtained analytically in closed form. Rather unexpectedly,
the spectra are symmetric under the exchange $\mu\leftrightarrow\Theta-\mu$,
where $\Theta$ is the common arc length of the links. For the symmetric point
$\mu=\Theta/2$, the problem can be exactly mapped onto a tight-binding model in
the presence of the magnetic field generated by a Dirac monopole, studied
recently. The dependence of the total energy at half filling on $\mu$ is
investigated in all examples.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:43:30 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Mar 2008 14:35:42 GMT"
}
] | 2008-06-13T00:00:00 | [
[
"Avishai",
"Y.",
""
],
[
"Luck",
"J. M.",
""
]
] | [
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] |
802.0796 | Pierre-Olivier Petrucci | Pierre-Olivier Petrucci (LAOG) | Models of Comptonization | 5 pages, 6 figures, invited talk at 'Simbol-X: the hard X-ray
universe in focus', Bologna (Italy), 14-16 May, 2007. To appear in Memorie
della SAIt | null | null | null | astro-ph | null | After a rapid introduction about the models of comptonization, we present
some simulations that underlines the expected capabilities of Simbol-X to
constrain the presence of this process in objects like AGNs or XRB.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:45:45 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Petrucci",
"Pierre-Olivier",
"",
"LAOG"
]
] | [
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] |
802.0797 | Abdourrahmane Atto | Abdourrahmane Atto (TAMCIC), Dominique Pastor (TAMCIC) | Central Limit Theorems for Wavelet Packet Decompositions of Stationary
Random Processes | Submitted to the IEEE Transactions on Signal Processing, October 2008 | IEEE Transactions on Signal Processing (2008) 1-12 | 10.1109/TSP.2009.2031726 | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper provides central limit theorems for the wavelet packet
decomposition of stationary band-limited random processes. The asymptotic
analysis is performed for the sequences of the wavelet packet coefficients
returned at the nodes of any given path of the $M$-band wavelet packet
decomposition tree. It is shown that if the input process is centred and
strictly stationary, these sequences converge in distribution to white Gaussian
processes when the resolution level increases, provided that the decomposition
filters satisfy a suitable property of regularity. For any given path, the
variance of the limit white Gaussian process directly relates to the value of
the input process power spectral density at a specific frequency.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:46:14 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 12:59:07 GMT"
},
{
"version": "v3",
"created": "Fri, 17 Apr 2009 09:13:19 GMT"
}
] | 2009-10-26T00:00:00 | [
[
"Atto",
"Abdourrahmane",
"",
"TAMCIC"
],
[
"Pastor",
"Dominique",
"",
"TAMCIC"
]
] | [
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] |
802.0798 | Du\v{s}ko Borka | D. Borka, D. J. Mowbray, Z. L. Mi\v{s}kovi\'c, S. Petrovi\'c, N.
Ne\v{s}kovi\'c | Dynamic polarization effects on the angular distributions of protons
channeled through carbon nanotubes in dielectric media | 14 pages, 11 figures, Accepted for publication in Phys. Rev. A | null | 10.1103/PhysRevA.77.032903 | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The best level of ordering and straightening of carbon nanotube arrays is
often achieved when they are grown in a dielectric matrix, so such structures
present the most suitable candidates for future channeling experiments with
carbon nanotubes. Consequently, we investigate here how the dynamic
polarization of carbon valence electrons in the presence of various surrounding
dielectric media affects the angular distributions of protons channeled through
(11,~9) single-wall carbon nanotubes. Proton speeds between 3 and 10 a.u.,
corresponding to energies of 0.223 and 2.49 MeV, are chosen with the nanotube's
length varied between 0.1 and 1 $\mu$m. We describe the repulsive interaction
between a proton and the nanotube's atoms in a continuum-potential
approximation based on the Doyle-Turner potential, whereas the attractive image
force on a proton is calculated using a two-dimensional hydrodynamic model for
the dynamic response of the nanotube valence electrons, while assigning to the
surrounding medium an appropriate (frequency dependent) dielectric function.
The angular distributions of channeled protons are generated using a computer
simulation method which solves the proton equations of motion in the transverse
plane numerically. Our analysis shows that the presence of a dielectric medium
can strongly affect both the appearance and positions of maxima in the angular
distributions of channeled protons.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:48:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Borka",
"D.",
""
],
[
"Mowbray",
"D. J.",
""
],
[
"Mišković",
"Z. L.",
""
],
[
"Petrović",
"S.",
""
],
[
"Nešković",
"N.",
""
]
] | [
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] |
802.0799 | Thierry Val | Thierry Val (LATTIS), Adrien Van Den Bossche (LATTIS) | D\'eveloppement et analyse multi outils d'un protocole MAC
d\'eterministe pour un r\'eseau de capteurs sans fil | null | Colloque Francophone sur l'Ing\'enierie des Protocoles (CFIP), Les
Arcs : France (2008) | null | null | cs.NI | null | In this article, we present a multi-tool method for the development and the
analysis of a new medium access method. IEEE 802.15.4 / ZigBee technology has
been used as a basis for this new determinist MAC layer which enables a high
level of QoS. This WPAN can be typically used for wireless sensor networks
which require strong temporal constraints. To validate the proposed protocol,
three complementary and adequate tools are used: Petri Nets for the formal
validation of the algorithm, a dedicated simulator for the temporal aspects,
and some measures on a real prototype based on a couple of ZigBee FREESCALE
components for the hardware characterization of layers #1 and #2.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:52:44 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 15:37:27 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Val",
"Thierry",
"",
"LATTIS"
],
[
"Bossche",
"Adrien Van Den",
"",
"LATTIS"
]
] | [
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] |
802.08 | Giuseppe Metere | Giuseppe Metere | The ziqqurath of exact sequences of n-groupoids | PhD thesis of the author, supervisors S. Kasangian E.M. Vitale | null | null | null | math.CT math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher Dimensional Categories are showing relevant implications in several
fields of mathematical research. Nevertheless basic algebraic tools, in order
to further develop the theory, are far from being established. In this thesis
we introduce a notion of exactness for exact sequences of pointed n-groupoids.
Furthermore we test it generalizing a well known result for (fibrations of)
groupoids [R.Brown, 1970]. Namely, given a fibration F of (pointed) groupoids
and its strict kernel it is possible to obtain a 6-term exact sequence of
groups (of loops) and pointed sets (iso classes of objects). The ziqqurath, aka
step-pyramid, comes out from iterating this construction, and it consists in
several sequences of n-groupoids, (n-1)-groupoids and so on up to pointed sets
(0-groupoids), of increasing length.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:53:09 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Metere",
"Giuseppe",
""
]
] | [
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] |
802.0801 | Boris Zupnik | B.M. Zupnik | Chern-Simons theory in the SO(5)/U(2) harmonic superspace | Latex file, 17 pages, v2 with minor changes, v3 journal version | Theor.Math.Phys.157:1550-1564,2008 | 10.1007/s11232-008-0129-1 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the superspace of D=3, N=5 supersymmetry using SO(5)/U(2)
harmonic coordinates. Three analytic N=5 gauge superfields depend on three
vector and six harmonic bosonic coordinates and also on six Grassmann
coordinates. Decomposition of these superfields in Grassmann and harmonic
coordinates yields infinite-dimensional supermultiplets including a
three-dimensional gauge Chern-Simons field and auxiliary bosonic and fermionic
fields carrying SO(5) vector indices. The superfield action of this theory is
invariant with respect to D=3, N=6 conformal supersymmetry realized on N=5
superfields.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:45:53 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Mar 2008 13:55:34 GMT"
},
{
"version": "v3",
"created": "Thu, 23 Oct 2008 06:53:48 GMT"
}
] | 2008-12-25T00:00:00 | [
[
"Zupnik",
"B. M.",
""
]
] | [
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802.0802 | Ping Li | Ping Li | On Approximating Frequency Moments of Data Streams with Skewed
Projections | null | null | null | null | cs.DS cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose skewed stable random projections for approximating the pth
frequency moments of dynamic data streams (0<p<=2), which has been frequently
studied in theoretical computer science and database communities. Our method
significantly (or even infinitely when p->1) improves previous methods based on
(symmetric) stable random projections.
Our proposed method is applicable to data streams that are (a) insertion only
(the cash-register model); or (b) always non-negative (the strict Turnstile
model), or (c) eventually non-negative at check points. This is only a minor
restriction for practical applications.
Our method works particularly well when p = 1+/- \Delta and \Delta is small,
which is a practically important scenario. For example, \Delta may be the decay
rate or interest rate, which are usually small. Of course, when \Delta = 0, one
can compute the 1th frequent moment (i.e., the sum) essentially error-free
using a simple couter. Our method may be viewed as a ``genearlized counter'' in
that it can count the total value in the future, taking in account of the
effect of decaying or interest accruement.
In a summary, our contributions are two-fold. (A) This is the first propsal
of skewed stable random projections. (B) Based on first principle, we develop
various statistical estimators for skewed stable distributions, including their
variances and error (tail) probability bounds, and consequently the sample
complexity bounds.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 13:56:51 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Li",
"Ping",
""
]
] | [
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