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801.4373 | Sung-Chul Yoon | S.-C. Yoon, M. Cantiello, and N. Langer | Evolution of massive stars at very low metallicity including rotation
and binary interactions | 5 pages, 6 figures, To appear in "Proceedings of First Stars III,"
Eds. Brian W. O'Shea, Alexander Heger & Tom Abel | AIP Conf.Proc.990:225-229,2008 | 10.1063/1.2905548 | null | astro-ph | null | We discuss recent models on the evolution of massive stars at very low
metallicity including the effects of rotation, magnetic fields and binarity.
Very metal poor stars lose very little mass and angular momentum during the
main sequence evolution, and rotation plays a dominant role in their evolution.
In rapidly rotating massive stars, the rotationally induced mixing time scale
can be even shorter than the nuclear time scale throughout the main sequence.
The consequent quasi-chemically homogeneous evolution greatly differs from the
standard massive star evolution that leads to formation of red giants with
strong chemical stratification. Interesting outcomes of such a new mode of
evolution include the formation of rapidly rotating massive Wolf-Rayet stars
that emit large amounts of ionizing photons, the formation of a long gamma-ray
bursts and a hypernovae, and the production of large amounts of primary
nitrogen. We show that binary interactions can further enhance the effects of
rotation, as mass accretion in a close binary spins up the secondary.
| [
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801.4374 | Oscar Cata | O. Cata (LBNL) and V. Mateu (IFIC) | Novel patterns for vector mesons from the large-Nc limit | 7 pages | Phys.Rev.D77:116009,2008 | 10.1103/PhysRevD.77.116009 | null | hep-ph | null | We report on a relation between the decay constants of \rho-like
J^{PC}=1^{--} vector mesons, which arises solely from the perturbative analysis
of the VV, TT and VT correlators at order \alpha_s^0 in the large-N_c limit. We
find f_{V}^T/f_{V}=1/\sqrt{2} for highly excited states together with a pattern
of alternation in sign. Quite remarkably, recent lattice determinations
reported f_{\rho}^T/f_{\rho}=0.72(2), in excellent agreement with our large-N_c
result. This seems to suggest a pattern like f_{Vn}^T/f_{Vn}=(-1)^n/\sqrt{2}
for the whole (1^{--}) states. In order to test this conjecture in real QCD we
construct a set of spectral sum rules, which turn out to comply nicely with
this scenario.
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801.4375 | Karen Gibson | CDF Collaboration: T. Aaltonen et al | Measurement of Ratios of Fragmentation Fractions for Bottom Hadrons in
p-pbar Collisions at sqrt{s}=1.96 TeV | Submitted to PRD, 54 pages, 53 plots | Phys.Rev.D77:072003,2008 | 10.1103/PhysRevD.77.072003 | null | hep-ex hep-ph | null | This paper describes the first measurement of b-quark fragmentation fractions
into bottom hadrons in Run II of the Tevatron Collider at Fermilab. The result
is based on a 360 pb-1 sample of data collected with the CDF II detector in
p-pbar collisions at sqrt{s}=1.96 TeV. Semileptonic decays of B0, B+, and B_s
mesons, as well as Lambda_b baryons, are reconstructed. For an effective bottom
hadron p_T threshold of 7 GeV/c, the fragmentation fractions are measured to be
f_u/f_d=1.054 +/- 0.018 (stat) +0.025-0.045(sys) +/- 0.058 (Br),
f_s/(f_u+f_d)=0.160 +/- 0.005 (stat) +0.011-0.010 (sys) +0.057-0.034 (Br), and
f_{Lambda_b}/(f_u+f_d)=0.281\pm0.012 (stat) +0.058-0.056 (sys) +0.128-0.086
(Br), where the uncertainty (Br) is due to uncertainties on measured branching
ratios. The value of f_s/(f_u+f_d) agrees within one standard deviation with
previous CDF measurements and the world average of this quantity, which is
dominated by LEP measurements. However, the ratio f_{Lambda_b}/(f_u+f_d) is
approximately twice the value previously measured at LEP. The approximately 2
sigma discrepancy is examined in terms of kinematic differences between the two
production environments.
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] |
801.4376 | Michael Kachelrie{\ss} | M. Kachelriess | Lecture notes on high energy cosmic rays | 82 pages, prepared for the 17th Jyvaskyla Summer School, comments
welcome | null | null | null | astro-ph | null | I give a concise introduction into high energy cosmic ray physics, including
also few related aspects of high energy gamma-ray and neutrino astrophysics.
The main emphasis is placed on astrophysical questions, and the level of the
presentation is kept basic.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 16:44:54 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Kachelriess",
"M.",
""
]
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801.4377 | Stefan Kraus | Stefan Kraus, Thomas Preibisch, Keiichi Ohnaka | Resolving the inner active accretion disk around the Herbig Be star MWC
147 with VLTI/MIDI+AMBER spectro-interferometry | 5 pages, 4 figures, Proceedings paper for the ESO workshop "The VLT
in the ELT era", Garching, October 2007 | null | 10.1007/978-1-4020-9190-2_19 | null | astro-ph | null | We studied the geometry of the inner (AU-scale) circumstellar environment
around the Herbig Be star MWC 147. Combining, for the first time, near- (NIR, K
band) and mid-infrared (MIR, N band) spectro-interferometry on a Herbig star,
our VLTI/MIDI and AMBER data constrain not only the geometry of the brightness
distribution, but also the radial temperature distribution in the disk.
For our detailed modeling of the interferometric data and the spectral energy
distribution, we employ 2-D radiation transfer simulations, showing that
passive irradiated Keplerian dust disks can easily fit the SED, but predict
much lower visibilities than observed. Models of a Keplerian disk with emission
from an optically thick inner gaseous accretion disk (inside the dust
sublimation zone), however, yield a good fit of the SED and simultaneously
reproduce the observed NIR and MIR visibilities. We conclude that the NIR
continuum emission from MWC 147 is dominated by accretion luminosity emerging
from an optically thick inner gaseous disk, while the MIR emission also
contains strong contributions from the outer dust disk.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 21:00:48 GMT"
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] | 2009-11-13T00:00:00 | [
[
"Kraus",
"Stefan",
""
],
[
"Preibisch",
"Thomas",
""
],
[
"Ohnaka",
"Keiichi",
""
]
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801.4378 | Dan Hooper | Dan Hooper | Constraining Supersymmetric Dark Matter With Synchrotron Measurements | 4 pages, 3 figures | Phys.Rev.D77:123523,2008 | 10.1103/PhysRevD.77.123523 | FERMILAB-PUB-08-019-A | hep-ph astro-ph | null | The annihilations of neutralino dark matter (or other dark matter candidate)
generate, among other Standard Model states, electrons and positrons. These
particles emit synchrotron photons as a result of their interaction with the
Galactic Magnetic Field. In this letter, we use the measurements of the WMAP
satellite to constrain the intensity of this synchrotron emission and, in turn,
the annihilation cross section of the lightest neutralino. We find this
constraint to be more stringent than that provided by any other current
indirect detection channel. In particular, the neutralino annihilation cross
section must be less than ~ 3 x 10^-26 cm^3/s (1 x 10^25 cm^3/s) for 100 GeV
(500 GeV) neutralinos distributed with an NFW halo profile. For the
conservative case of an entirely flat dark matter distribution within the inner
8 kiloparsecs of the Milky Way, the constraint is approximately a factor of 30
less stringent. Even in this conservative case, synchrotron measurements
strongly constrain, for example, the possibility of wino or higgsino neutralino
dark matter produced non-thermally in the early universe.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 21:01:01 GMT"
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] | 2008-11-26T00:00:00 | [
[
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] |
801.4379 | Francesco Shankar | Francesco Shankar, Xinyu Dai, and Gregory R. Sivakoff (The Ohio State
University) | Dependence of the BALQSO fraction on Radio Luminosity | replaced with version accepted by ApJ; more complete analysis; basic
results unchanged | ApJ 687 (2008) 859-868 | 10.1086/591488 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find that the fraction of classical Broad Absorption Line quasars
(BALQSOs) among the FIRST radio sources in the Sloan Data Release 3, is
20.5^{+7.3}_{-5.9}% at the faintest radio powers detected (L_{\rm 1.4
GHz}~10^{32} erg/s), and rapidly drops to <8% at L_{\rm 1.4 GHz}~3*10^{33}
erg/s. Similarly, adopting the broader Absorption Index (AI) definition of
Trump et al. (2006) we find the fraction of radio BALQSOs to be
44^{+8.1}_{-7.8}% reducing to 23.1^{+7.3}_{-6.1}% at high luminosities. While
the high fraction at low radio power is consistent with the recent near-IR
estimates by Dai et al. (2008), the lower fraction at high radio powers is
intriguing and confirms previous claims based on smaller samples. The trend is
independent of the redshift range, the optical and radio flux selection limits,
or the exact definition of a radio match. We also find that at fixed optical
magnitude, the highest bins of radio luminosity are preferentially populated by
non-BALQSOs, consistent with the overall trend. We do find, however, that those
quasars identified as AI-BALQSOs but \emph{not} under the classical definition,
do not show a significant drop in their fraction as a function of radio power,
further supporting independent claims for which these sources, characterized by
lower equivalent width, may represent an independent class with respect to the
classical BALQSOs. We find the balnicity index, a measure of the absorption
trough in BALQSOs, and the mean maximum wind velocity to be roughly constant at
all radio powers. We discuss several plausible physical models which may
explain the observed fast drop in the fraction of the classical BALQSOs with
increasing radio power, \emph{although no one is entirely satisfactory}.
(abridged).
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 22:54:15 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jul 2008 22:43:39 GMT"
}
] | 2009-01-15T00:00:00 | [
[
"Shankar",
"Francesco",
"",
"The Ohio State\n University"
],
[
"Dai",
"Xinyu",
"",
"The Ohio State\n University"
],
[
"Sivakoff",
"Gregory R.",
"",
"The Ohio State\n University"
]
] | [
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] |
801.438 | Tommaso Giannantonio | Tommaso Giannantonio (ICG Portsmouth), Ryan Scranton (Pittsburgh),
Robert G. Crittenden (ICG Portsmouth), Robert C. Nichol (ICG Portsmouth),
Stephen P. Boughn (Haverford), Adam D. Myers (Illinois), Gordon T. Richards
(Drexel) | Combined analysis of the integrated Sachs-Wolfe effect and cosmological
implications | 24 pages, 15 figures. Version accepted by PRD. Improved quasar data,
revised parameter constraints | Phys.Rev.D77:123520,2008 | 10.1103/PhysRevD.77.123520 | null | astro-ph | null | We present a global measurement of the integrated Sachs-Wolfe (ISW) effect
obtained by cross-correlating all relevant large scale galaxy data sets with
the cosmic microwave background radiation map provided by the Wilkinson
Microwave Anisotropy Probe. With these measurements, the overall ISW signal is
detected at the ~ 4.5 sigma level. We also examine the cosmological
implications of these measurements, particularly the dark energy equation of
state w, its sound speed, and the overall curvature of the Universe. The flat
LCDM model is a good fit to the data and, assuming this model, we find that the
ISW data constrain Omega_m = 0.20 +0.19 -0.11 at the 95% confidence level. When
we combine our ISW results with the latest baryon oscillation and supernovae
measurements, we find that the result is still consistent with a flat LCDM
model with w = -1 out to redshifts z > 1.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 17:38:38 GMT"
},
{
"version": "v2",
"created": "Tue, 6 May 2008 16:40:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Giannantonio",
"Tommaso",
"",
"ICG Portsmouth"
],
[
"Scranton",
"Ryan",
"",
"Pittsburgh"
],
[
"Crittenden",
"Robert G.",
"",
"ICG Portsmouth"
],
[
"Nichol",
"Robert C.",
"",
"ICG Portsmouth"
],
[
"Boughn",
"Stephen P.",
"",
"Haverford"
],
[
"Myers",
"Adam D.",
"",
"Illinois"
],
[
"Richards",
"Gordon T.",
"",
"Drexel"
]
] | [
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] |
801.4381 | Panayiotis Tzanavaris | P. Tzanavaris (1,2,3), I. Georgantopoulos (1) ((1)National Observatory
of Athens, Greece, (2)NASA/Goddard Space Flight Center, (3)The Johns Hopkins
University) | The galaxy luminosity function and its evolution with Chandra | Accepted for publication in A&A | null | 10.1051/0004-6361:20078193 | null | astro-ph | null | AIMS: We have compiled one of the largest normal-galaxy samples ever to probe
X-ray luminosity function evolution separately for early and late-type systems.
METHODS: We selected 207 normal galaxies up to redshift z~1.4, with data from
four major Chandra X-ray surveys, namely the Chandra deep fields (north, south
and extended) and XBootes, and a combination of X-ray and optical criteria. We
used template spectral energy-distribution fitting to obtain separate early-
and late-type sub-samples, made up of 101 and 106 systems, respectively. For
the full sample, as well as the two sub-samples, we obtained luminosity
functions using both a non-parametric and a parametric, maximum-likelihood
method.
RESULTS: For the full sample, the non-parametric method strongly suggests
luminosity evolution with redshift. The maximum-likelihood estimate shows that
this evolution follows ~(1+z)^k_total, k_total=2.2+-0.3. For the late-type
sub-sample, we obtained k_late=2.4^+1.0_-2.0. We detected no significant
evolution in the early-type sub-sample. The distributions of early and
late-type systems with redshift show that late types dominate at z>~0.5 and
hence drive the observed evolution for the total sample.
CONCLUSIONS: Our results support previous results in X-ray and other
wavebands, which suggests luminosity evolution with k=2-3.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 21:26:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tzanavaris",
"P.",
""
],
[
"Georgantopoulos",
"I.",
""
]
] | [
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801.4382 | Himel Ghosh | Himel Ghosh (1), Smita Mathur (1), Fabrizio Fiore (2), Laura Ferrarese
(3) ((1) Ohio State University, (2) INAF - Osservatorio Astronomico di Roma,
(3) Herzberg Institute of Astrophysics) | Low-Level Nuclear Activity in Nearby Spiral Galaxies | 37 pages, 10 figures, ApJ, in press. Replaced with accepted version | null | 10.1086/591508 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are conducting a search for supermassive black holes (SMBHs) with masses
below 10^7 M_sun by looking for signs of extremely low-level nuclear activity
in nearby galaxies that are not known to be AGNs. Our survey has the following
characteristics: (a) X-ray selection using the Chandra X-ray Observatory, since
x-rays are a ubiquitous feature of AGNs; (b) Emphasis on late-type spiral and
dwarf galaxies, as the galaxies most likely to have low-mass SMBHs; (c) Use of
multiwavelength data to verify the source is an AGN; and (d) Use of the highest
angular resolution available for observations in x-rays and other bands, to
separate nuclear from off-nuclear sources and to minimize contamination by host
galaxy light. Here we show the feasibility of this technique to find AGNs by
applying it to six nearby, face-on spiral galaxies (NGC 3169, NGC 3184, NGC
4102, NGC 4647, NGC 4713, NGC 5457) for which data already exist in the Chandra
archive. All six show nuclear x-ray sources. The data as they exist at present
are ambiguous regarding the nature of the nuclear x-ray sources in NGC 4713 and
NGC 4647. We conclude, in accord with previous studies, that NGC 3169 and NGC
4102 are almost certainly AGNs. Most interestingly, a strong argument can be
made that NGC 3184 and NGC 5457, both of type Scd, host AGNs.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 21:05:49 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jun 2008 20:12:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ghosh",
"Himel",
""
],
[
"Mathur",
"Smita",
""
],
[
"Fiore",
"Fabrizio",
""
],
[
"Ferrarese",
"Laura",
""
]
] | [
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801.4383 | Brian Batell | Brian Batell, Tony Gherghetta | Dynamical Soft-Wall AdS/QCD | 9 pages; v2: references added, minor corrections | Phys.Rev.D78:026002,2008 | 10.1103/PhysRevD.78.026002 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a solution of the five-dimensional gravity-dilaton-tachyon
equations of motion with a pure AdS_5 metric and a quadratic dilaton and linear
tachyon in conformal coordinates. This leads to an infrared soft wall model
where the dilaton profile gives rise to linear Regge trajectories for the
four-dimensional mass spectrum of the dual gauge theory. Even though our
approach is phenomenological the scalar fields resemble the dilaton and the
closed string tachyon of a non-critical string theory. Interestingly, the
linear tachyon has the correct profile to imply that chiral symmetry is not
restored for highly excited states. Our solution thus provides a dynamical
bottom-up model of linear confinement in holographic QCD.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 23:01:48 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jul 2008 13:54:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Batell",
"Brian",
""
],
[
"Gherghetta",
"Tony",
""
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] |
801.4384 | Patrick De Leenheer | Patrick De Leenheer | Within-host HIV models with periodic antiretroviral therapy | 13 pages, 9 figures | null | null | null | q-bio.OT | null | This paper investigates the effect of drug treatment on the standard
within-host HIV model, assuming that therapy occurs periodically. It is shown
that eradication is possible under these periodic regimes, and we
quantitatively characterize successful drugs or drug combinations, both
theoretically and numerically. We also consider certain optimization problems,
motivated for instance, by the fact that eradication should be achieved at
acceptable toxicity levels to the patient. It turns out that these optimization
problems can be simplified considerably, and this makes calculations of the
optima a fairly straightforward task. All our results will be illustrated by
means of numerical examples based on up-to-date knowledge of parameter values
in the model.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 21:12:08 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"De Leenheer",
"Patrick",
""
]
] | [
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] |
801.4385 | Samuela Pasquali | S. Pasquali, A. C. Maggs | Numerical studies of Casimir interactions | 4 pages, 5 figures | null | null | null | quant-ph cond-mat.stat-mech | null | We study numerically the Casimir interaction between dielectrics in both two
and three dimensions. We demonstrate how sparse matrix factorizations enable
one to study torsional interactions in three dimensions. In two dimensions we
study the full cross-over between non-retarded and retarded interactions as a
function of separation. We use constrained factorizations in order to measure
the interaction of a particle with a rough dielectric surface and compare with
a scaling argument.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 21:18:59 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Pasquali",
"S.",
""
],
[
"Maggs",
"A. C.",
""
]
] | [
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801.4386 | Panayiotis Tzanavaris | I. Georgantopoulos (1), P. Tzanavaris (1,2,3) ((1) National
Observatory of Athens, Greece, (2) NASA/Goddard Space Flight Center, (3) The
Johns Hopkins University) | The X-ray luminosity function of galaxies and its evolution | Accepted to be published as an MPE report for the conference "X-rays
from nearby galaxies" (ESAC, Spain, September 5-7, 2007); S. Carpano (ed.) | null | null | null | astro-ph | null | We compile one of the largest ever samples to probe the X-ray normal galaxy
luminosity function and its evolution with cosmic time. In particular, we
select 207 galaxies (106 late and 101 early-type systems) from the Chandra Deep
Field North and South surveys, the Extended Chandra Deep Field South and the
XBOOTES survey. We derive the luminosity function separately for the total
(early+late), the early and the late-type samples using both a parametric
maximum likelihood method, and a variant of the non-parametric 1/V_m method.
Although the statistics is limited, we find that the total (early+late) galaxy
sample is consistent with a Pure Luminosity evolution model where the
luminosity evolves according to L(z) ~ (1+z)^2.2. The late-type systems appear
to drive this trend while the early-type systems show much weaker evidence for
evolution. We argue that the X-ray evolution of late-type systems is consistent
with that of blue galaxies in the optical. In contrast there is a mismatch
between the X-ray evolution of early-type systems and that of red galaxies at
optical wavelengths.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 21:29:19 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Georgantopoulos",
"I.",
""
],
[
"Tzanavaris",
"P.",
""
]
] | [
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] |
801.4387 | Luis Lehner | Matthew Anderson, Eric W. Hirschmann, Luis Lehner, Steven L. Liebling,
Patrick M. Motl, David Neilsen, Carlos Palenzuela, Joel E. Tohline | Magnetized Neutron Star Mergers and Gravitational Wave Signals | Replaced with accepted PRL version. (Figures have been reduced in
quality) | Phys.Rev.Lett.100:191101,2008 | 10.1103/PhysRevLett.100.191101 | null | gr-qc astro-ph physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the influence of magnetic fields upon the dynamics of and
resulting gravitational waves from a binary neutron star merger in full general
relativity coupled to ideal magnetohydrodynamics (MHD). We consider two merger
scenarios, one where the stars begin with initially aligned poloidal magnetic
fields and one with no magnetic field. Both mergers result in a strongly
differentially rotating object. In comparison to the non-magnetized scenario,
the aligned magnetic fields delay the final merger of the two stars. During and
after merger we observe phenomena driven by the magnetic field, including
Kelvin-Helmholtz instabilities in shear layers, winding of the field lines, and
transition from poloidal to toroidal fields. These effects not only produce
electromagnetic radiation, but also can have a strong influence on the
gravitational waves. Thus, there are promising prospects for studying such
systems with both types of waves.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 22:14:51 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jun 2008 23:24:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Anderson",
"Matthew",
""
],
[
"Hirschmann",
"Eric W.",
""
],
[
"Lehner",
"Luis",
""
],
[
"Liebling",
"Steven L.",
""
],
[
"Motl",
"Patrick M.",
""
],
[
"Neilsen",
"David",
""
],
[
"Palenzuela",
"Carlos",
""
],
[
"Tohline",
"Joel E.",
""
]
] | [
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] |
801.4388 | Arunav Kundu | Arunav Kundu, Stephen E. Zepf, Thomas J. Maccarone | The Low Mass X-ray Binary - Globular Cluster Link and its Implications | To be be published in the proceedings of, "A Population Explosion:
The Nature and Evolution of X-ray Binaries in Diverse Environments", eds.
Bandyopadhyay et al | AIP Conf.Proc.1010:313-319,2008 | 10.1063/1.2945065 | null | astro-ph | null | Studies of nearby elliptical and S0 galaxies reveal that roughly half of the
low mass X-ray binaries (LMXBs), which are luminous tracers of accreting
neutron star or black hole systems, are in clusters. There is a surprising
tendency of LMXBs to be preferentially associated with metal-rich globular
clusters (GCs), with metal-rich GCs hosting three times as many LMXBs as
metal-poor ones. There is no convincing evidence of a correlation with GC age
so far. In some galaxies the LMXB formation rate varies with GC color even
within the metal-rich peak of the typical bimodal cluster metallicity
distribution. This provides some of the strongest evidence to date that there
are metallicity variations within the metal-rich GC peak, as is expected in
hierarchical galaxy formation scenarios. We also note that apparent
correlations between the interaction rates in GCs and LMXB frequency may not be
reliable because of the uncertainties in some GC parameters. We argue in fact
that there are considerable uncertainties in the integrated properties of even
the Milky Way clusters that are often overlooked.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 21:30:20 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Kundu",
"Arunav",
""
],
[
"Zepf",
"Stephen E.",
""
],
[
"Maccarone",
"Thomas J.",
""
]
] | [
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] |
801.4389 | Frank J. Petriello | Frank Petriello, Seth Quackenbush | Measuring Z' couplings at the LHC | 22 pgs., 6 figs; refs and discussion added | Phys.Rev.D77:115004,2008 | 10.1103/PhysRevD.77.115004 | null | hep-ph | null | We study the properties of potential new Z' gauge bosons produced through the
Drell-Yan mechanism at the LHC. Our analysis is performed using a fully
differential next-to-leading order QCD calculation with spin correlations,
interference effects, and experimental acceptances included. We examine the
distinguishability of different models and the feasibility of extracting
general coupling information with statistical, residual scale, and current
parton distribution function error estimates included. We extend a previous
parametrization of Z' couplings to include parity-violating coupling
combinations, and introduce a convenient technique for simulating new gauge
bosons on-peak using the concept of basis models. We illustrate our procedure
using several example Z' models. We find that one can extract reliably four
combinations of generation-independent quark and lepton couplings in our
analysis. For a Z' mass of 1.5 TeV, one can determine coupling information very
well assuming 100 fb^{-1} of integrated luminosity, and a precise measurement
becomes possible with 1 ab^{-1} at the SLHC. For a 3 TeV mass, a reasonable
determination requires the SLHC.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 22:07:12 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Apr 2008 21:14:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Petriello",
"Frank",
""
],
[
"Quackenbush",
"Seth",
""
]
] | [
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] |
801.439 | Ken-Ichi Nishikawa | K.-I. Nishikawa (NSSTC/Uah), Y. Mizuno (NASA/MSFC/NSSTC), G. J.
Fishman (NASA/MSFC), P. Hardee (UA) | Particle Acceleration, Magnetic Field Generation, and Associated
Emission in Collisionless Relativistic Jets | 4 pages, 3 figures, contributed talk at the workshop: High Energy
Phenomena in Relativistic Outflows (HEPRO), Dublin, 24-28 September 2007.
Fig. 3 is replaced by the correct version | Int.J.Mod.Phys.D17:1761-1767,2008 | 10.1142/S0218271808013388 | null | astro-ph | null | Nonthermal radiation observed from astrophysical systems containing
relativistic jets and shocks, e.g., active galactic nuclei (AGNs), gamma-ray
bursts (GRBs), and Galactic microquasar systems usually have power-law emission
spectra. Recent PIC simulations using injected relativistic electron-ion
(electro-positron) jets show that acceleration occurs within the downstream
jet. Shock acceleration is a ubiquitous phenomenon in astrophysical plasmas.
Plasma waves and their associated instabilities (e.g., the Buneman instability,
other two-streaming instability, and the Weibel instability) created in the
shocks are responsible for particle (electron, positron, and ion) acceleration.
The simulation results show that the Weibel instability is responsible for
generating and amplifying highly nonuniform, small-scale magnetic fields. These
magnetic fields contribute to the electron's transverse deflection behind the
jet head. The ``jitter'' radiation from deflected electrons has different
properties than synchrotron radiation which assumes a uniform magnetic field.
This jitter radiation may be important to understanding the complex time
evolution and/or spectral structure in gamma-ray bursts, relativistic jets, and
supernova remnants.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 22:08:57 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 16:53:48 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Nishikawa",
"K. -I.",
"",
"NSSTC/Uah"
],
[
"Mizuno",
"Y.",
"",
"NASA/MSFC/NSSTC"
],
[
"Fishman",
"G. J.",
"",
"NASA/MSFC"
],
[
"Hardee",
"P.",
"",
"UA"
]
] | [
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] |
801.4391 | Zohar Nussinov | Zohar Nussinov, Gerardo Ortiz | Orbital order driven quantum criticality | 6 pages, 1 figure (to appear in Europhysics Letters) | null | 10.1209/0295-5075/84/36005 | null | cond-mat.str-el cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Charge, spin, and orbital degrees of freedom underlie the physics of
transition metal compounds. Much work has revealed quantum critical points
associated with spin and charge degrees of freedom in many of these systems.
Here we illustrate that the simplest models that embody the orbital degrees of
freedom - the two- and three-dimensional quantum orbital compass models -
exhibit an exact quantum critical behavior on diluted square and cubic lattices
(with a doping fraction of 1/4 and 1/2 respectively). This raises the
possibility of quantum critical points triggered by the degradation of orbital
order upon doping (or applying pressure to) such transition metal systems. We
prove the existence of an orbital spin glass in several related systems in
which the orbital couplings are made non-uniform. Moreover, a new orbital
Larmor precession (i.e., a periodic change in the orbital state) is predicted
when uniaxial pressure is applied.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 20:46:48 GMT"
},
{
"version": "v2",
"created": "Wed, 15 Oct 2008 16:34:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nussinov",
"Zohar",
""
],
[
"Ortiz",
"Gerardo",
""
]
] | [
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] |
801.4392 | Qing Xiang | David B. Chandler, Peter Sin, Qing Xiang | Incidence Modules for Symplectic Spaces in Characteristic Two | null | null | null | null | math.CO math.RT | null | We study the permutation action of a finite symplectic group of
characteristic 2 on the set of subspaces of its standard module which are
either totally isotropic or else complementary to totally isotropic subspaces
with respect to the alternating form. A general formula is obtained for the
2-rank of the incidence matrix for the inclusion of one-dimensional subspaces
in the distinguished subspaces of a fixed dimension.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 22:15:45 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Chandler",
"David B.",
""
],
[
"Sin",
"Peter",
""
],
[
"Xiang",
"Qing",
""
]
] | [
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] |
801.4393 | Harm Derksen | Harm Derksen | Symmetric and Quasi-Symmetric Functions associated to Polymatroids | 37 pages | null | null | null | math.CO math.AC | null | To every subspace arrangement X we will associate symmetric functions P[X]
and H[X]. These symmetric functions encode the Hilbert series and the minimal
projective resolution of the product ideal associated to the subspace
arrangement. They can be defined for discrete polymatroids as well. The
invariant H[X] specializes to the Tutte polynomial T[X]. Billera, Jia and
Reiner recently introduced a quasi-symmetric function F[X] (for matroids) which
behaves valuatively with respect to matroid base polytope decompositions. We
will define a quasi-symmetric function G[X] for polymatroids which has this
property as well. Moreover, G[X] specializes to P[X], H[X], T[X] and F[X].
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 22:30:48 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Derksen",
"Harm",
""
]
] | [
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] |
801.4394 | Tobias Reichenbach | Tobias Reichenbach, Thomas Franosch, and Erwin Frey | Domain wall delocalization, dynamics and fluctuations in an exclusion
process with two internal states | 10 pages, 5 figures | Eur. Phys. J. E 27, 47-56 (2008) | 10.1140/epje/i2008-10350-3 | LMU-ASC 06/08 | cond-mat.stat-mech q-bio.SC | null | We investigate the delocalization transition appearing in an exclusion
process with two internal states resp. on two parallel lanes. At the
transition, delocalized domain walls form in the density profiles of both
internal states, in agreement with a mean-field approach. Remarkably, the
topology of the system's phase diagram allows for the delocalization of a
(localized) domain wall when approaching the transition. We quantify the domain
wall's delocalization close to the transition by analytic results obtained
within the framework of the domain wall picture. Power-law dependences of the
domain wall width on the distance to the delocalization transition as well as
on the system size are uncovered, they agree with numerical results.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 18:40:56 GMT"
}
] | 2008-08-31T00:00:00 | [
[
"Reichenbach",
"Tobias",
""
],
[
"Franosch",
"Thomas",
""
],
[
"Frey",
"Erwin",
""
]
] | [
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] |
801.4395 | Baruch Vainas | Baruch Vainas | Transition from 12 to near-24 hours glucose circadian rhythm on
relaxation of a hyperglycemic condition | 10 pages, 3 figures | null | null | null | q-bio.QM | null | A composite, exponential relaxation function, modulated by a periodic
component, was used to fit to an experimental time series of blood glucose
levels. The 11 parameters function that allows for the detection of a possible
rhythm transition was fitted to the experimental time series using a genetic
algorithm. It has been found that the relaxation from a hyperglycemic condition
following a change in the anti-diabetic treatment, can be characterized by a
change from an initial 12 hours ultradian rhythm to a near-24 hours circadian
rhythm.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 22:27:12 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Vainas",
"Baruch",
""
]
] | [
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801.4396 | Serge Tabachnikov | M. Levi, S. Tabachnikov | On bicycle tire tracks geometry, hatchet planimeter, Menzin's conjecture
and oscillation of unicycle tracks | null | null | null | null | math.DG | null | The model of a bicycle is a unit segment AB that can move in the plane so
that it remains tangent to the trajectory of point A (the rear wheel is fixed
on the bicycle frame); the same model describes the hatchet planimeter. The
trajectory of the front wheel and the initial position of the bicycle uniquely
determine its motion and its terminal position; the monodromy map sending the
initial position to the terminal one arises. According to R. Foote's theorem,
this mapping of a circle to a circle is a Moebius transformation. We extend
this result to multi-dimensional setting. Moebius transformations belong to one
of the three types: elliptic, parabolic and hyperbolic. We prove a 100 years
old Menzin's conjecture: if the front wheel track is an oval with area at least
pi then the respective monodromy is hyperbolic. We also study bicycle motions
introduced by D. Finn in which the rear wheel follows the track of the front
wheel. Such a ''unicycle" track becomes more and more oscillatory in forward
direction. We prove that it cannot be infinitely extended backward and relate
the problem to the geometry of the space of forward semi-infinite equilateral
linkages.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 22:57:38 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Levi",
"M.",
""
],
[
"Tabachnikov",
"S.",
""
]
] | [
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] |
801.4397 | Ovidiu Patu | Ovidiu I. Patu, Vladimir E. Korepin, Dmitri V. Averin | One-Dimensional Impenetrable Anyons in Thermal Equilibrium. I. Anyonic
Generalization of Lenard's Formula | 13 pages, RevTeX 4 | J. Phys. A: Math. Theor. 41 (2008) 145006 | 10.1088/1751-8113/41/14/145006 | null | cond-mat.stat-mech math-ph math.MP quant-ph | null | We have obtained an expansion of the reduced density matrices (or,
equivalently, correlation functions of the fields) of impenetrable
one-dimensional anyons in terms of the reduced density matrices of fermions
using the mapping between anyon and fermion wavefunctions. This is the
generalization to anyonic statistics of the result obtained by A. Lenard for
bosons. In the case of impenetrable but otherwise free anyons with statistical
parameter $\kappa$, the anyonic reduced density matrices in the grand canonical
ensemble is expressed as Fredholm minors of the integral operator ($1-\gamma
\hat \theta_T$) with complex statistics-dependent coefficient $\gamma=(1+e^{\pm
i\pi\kappa})/ \pi$. For $\kappa=0$ we recover the bosonic case of Lenard
$\gamma=2/\pi$. Due to nonconservation of parity, the anyonic field correlators
$\la \fad(x')\fa(x)\ra$ are different depending on the sign of $x'-x$.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 23:08:06 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Apr 2008 21:08:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Patu",
"Ovidiu I.",
""
],
[
"Korepin",
"Vladimir E.",
""
],
[
"Averin",
"Dmitri V.",
""
]
] | [
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] |
801.4398 | Elena Poletaeva | Elena Poletaeva | Matrix realizations of exceptional superconformal algebras | 17 pages, LaTeX, to be published in the Journal of Geometry and
Physics | null | 10.1016/j.geomphys.2008.01.005 | null | math-ph math.MP | null | We give a general construction of realizations of the contact superconformal
algebras $K(2)$ and $\hat{K}'(4)$, and the exceptional superconformal algebra
$CK_6$ as subsuperalgebras of matrices over a Weyl algebra of size $2^N\times
2^N$, where $N = 1, 2$ and $3$. We show that there is no such a realization for
$K(2N)$, if $N\geq 4$.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 23:16:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Poletaeva",
"Elena",
""
]
] | [
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801.4399 | Tomasz Radozycki | Tomasz Radozycki | Instantons and the infrared behavior of the fermion propagator in the
Schwinger Model | 9 pages, in REVTEX | Eur.Phys.J.C55:509-516,2008 | 10.1140/epjc/s10052-008-0622-6 | null | hep-th | null | Fermion propagator of the Schwinger Model is revisited from the point of view
of its infrared behavior. The values of anomalous dimensions are found in
arbitrary covariant gauge and in all contributing instanton sectors. In the
case of a gauge invariant, but path dependent propagator, the exponential
dependence, instead of power law one, is established for the special case when
the path is a straight line. The leading behavior is almost identical in any
sector, differing only by the slowly varying, algebraic prefactors. The other
kind of the gauge invariant function, which is the amplitude of the dressed
Dirac fermions, may be reduced, by the appropriate choice of the dressing, to
the gauge variant one, if Landau gauge is imposed.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 23:23:48 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 22:35:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Radozycki",
"Tomasz",
""
]
] | [
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] |
801.44 | Alain Rouault | Fabrice Gamboa, Alain Rouault | Canonical moments and random spectral measures | 32 pages. Revised version accepted for publication in Journal of
Theoretical Probability | null | 10.1007/s10959-009-0239-1 | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study some connections between the random moment problem and the random
matrix theory. A uniform draw in a space of moments can be lifted into the
spectral probability measure of the pair (A,e) where A is a random matrix from
a classical ensemble and e is a fixed unit vector. This random measure is a
weighted sampling among the eigenvalues of A. We also study the large
deviations properties of this random measure when the dimension of the matrix
grows. The rate function for these large deviations involves the reversed
Kullback information.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 16:21:35 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Oct 2008 17:01:20 GMT"
},
{
"version": "v3",
"created": "Tue, 7 Jul 2009 09:15:16 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Gamboa",
"Fabrice",
""
],
[
"Rouault",
"Alain",
""
]
] | [
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] |
801.4401 | Francisco Lobo | Francisco S. N. Lobo | General class of wormhole geometries in conformal Weyl gravity | 7 pages, Revtex4. V2: typos corrected. V3: 8 pages, section on the
energy conditions added, version to appear in Class. Quant. Gravity | Class.Quant.Grav.25:175006,2008 | 10.1088/0264-9381/25/17/175006 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, a general class of wormhole geometries in conformal Weyl
gravity is analyzed. A wide variety of exact solutions of asymptotically flat
spacetimes is found, in which the stress energy tensor profile differs
radically from its general relativistic counterpart. In particular, a class of
geometries is constructed that satisfies the energy conditions in the throat
neighborhood, which is in clear contrast to the general relativistic solutions.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 12:43:51 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 14:25:59 GMT"
},
{
"version": "v3",
"created": "Fri, 4 Jul 2008 16:00:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | [
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] |
801.4402 | Viswanath Ramakrishna | Yassmin Ansari and Viswanath Ramakrishna | On a Quaternionic Representation for Sp(4, R) | 21 pages; | null | null | null | math-ph math.MP | null | This work provides a quaternioinc reprsentation for real symplectic matrices
in dimension four, analogous to the pair of unit quaternions representation for
special orthogonal matrices. In the process of finding formulae for this
representation in terms of the entries of the symplectic matrix being thereby
represented, it shows how to compute the polar decomposition of a symplectic
matrix without any need for spectral calculation. The technique just requires
the solution of a simple 2x2 linear system. The work also characterizes
symplectic, positive definite matrices in dimension four, and thus can be used
in applications where the non-compact part of the symplectic group in dimension
four is of utility.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 23:37:47 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Ansari",
"Yassmin",
""
],
[
"Ramakrishna",
"Viswanath",
""
]
] | [
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] |
801.4403 | Lucas Cieza | Lucas Cieza, William D. Cochran, and Jean-Charles Augereau | Spitzer observations of the Hyades: Circumstellar debris disks at 625
Myr of age | 33 pages, 11 figures, accepted by ApJ | null | 10.1086/586887 | null | astro-ph | null | We use the Spitzer Space Telescope to search for infrared excess at 24, 70,
and 160 micron due to debris disks around a sample of 45 FGK-type members of
the Hyades cluster. We supplement our observations with archival 24 and 70
micron Spitzer data of an additional 22 FGK-type and 11 A-type Hyades members
in order to provide robust statistics on the incidence of debris disks at 625
Myr of age an era corresponding to the late heavy bombardment in the Solar
System. We find that none of the 67 FGK-type stars in our sample show evidence
for a debris disk, while 2 out of the 11 A-type stars do so. This difference in
debris disk detection rate is likely to be due to a sensitivity bias in favor
of early-type stars. The fractional disk luminosity, L_dust/L*, of the disks
around the two A-type stars is ~4.0E-5, a level that is below the sensitivity
of our observations toward the FGK-type stars. However, our sensitivity limits
for FGK-type stars are able to exclude, at the 2-sigma level, frequencies
higher than 12% and 5% of disks with L_dust/L* > 1.0E-4 and L_dust/L* > 5.0E-4,
respectively. We also use our sensitivity limits and debris disk models to
constrain the maximum mass of dust, as a function of distance from the stars,
that could remain undetected around our targets.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 00:08:31 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 04:13:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cieza",
"Lucas",
""
],
[
"Cochran",
"William D.",
""
],
[
"Augereau",
"Jean-Charles",
""
]
] | [
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] |
801.4404 | Nicolas Thi\'ery M. | Maurice Pouzet and Nicolas M. Thi\'ery | Some relational structures with polynomial growth and their associated
algebras II: Finite generation | 27 pages; submitted | null | null | null | math.CO math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The profile of a relational structure $R$ is the function $\varphi_R$ which
counts for every integer $n$ the number, possibly infinite, $\varphi_R(n)$ of
substructures of $R$ induced on the $n$-element subsets, isomorphic
substructures being identified. If $\varphi_R$ takes only finite values, this
is the Hilbert function of a graded algebra associated with $R$, the age
algebra $A(R)$, introduced by P.~J.~Cameron.
In a previous paper, we studied the relationship between the properties of a
relational structure and those of their algebra, particularly when the
relational structure $R$ admits a finite monomorphic decomposition. This
setting still encompasses well-studied graded commutative algebras like
invariant rings of finite permutation groups, or the rings of quasi-symmetric
polynomials.
In this paper, we investigate how far the well know algebraic properties of
those rings extend to age algebras. The main result is a combinatorial
characterization of when the age algebra is finitely generated. In the special
case of tournaments, we show that the age algebra is finitely generated if and
only if the profile is bounded. We explore the Cohen-Macaulay property in the
special case of invariants of permutation groupoids. Finally, we exhibit
sufficient conditions on the relational structure that make naturally the age
algebra into a Hopf algebra.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 00:08:24 GMT"
},
{
"version": "v2",
"created": "Sun, 15 Apr 2018 06:45:27 GMT"
}
] | 2018-04-17T00:00:00 | [
[
"Pouzet",
"Maurice",
""
],
[
"Thiéry",
"Nicolas M.",
""
]
] | [
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] |
801.4405 | David Charlton | David Charlton, Erik D. Demaine, Martin L. Demaine, Gregory Price,
Yaa-Lirng Tu | A Locked Orthogonal Tree | null | null | null | null | cs.CG | null | We give a counterexample to a conjecture of Poon [Poo06] that any orthogonal
tree in two dimensions can always be flattened by a continuous motion that
preserves edge lengths and avoids self-intersection. We show our example is
locked by extending results on strongly locked self-touching linkages due to
Connelly, Demaine and Rote [CDR02] to allow zero-length edges as defined in
[ADG07], which may be of independent interest. Our results also yield a locked
tree with only eleven edges, which is the smallest known example of a locked
tree.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 00:39:37 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Charlton",
"David",
""
],
[
"Demaine",
"Erik D.",
""
],
[
"Demaine",
"Martin L.",
""
],
[
"Price",
"Gregory",
""
],
[
"Tu",
"Yaa-Lirng",
""
]
] | [
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] |
801.4406 | Rishi Khatri | Rishi Khatri, Benjamin D. Wandelt | Cosmic (super)string constraints from 21 cm radiation | Accepted for publication in PRL | Phys.Rev.Lett.100:091302, 2008 | 10.1103/PhysRevLett.100.091302 | null | astro-ph | null | We calculate the contribution of cosmic strings arising from a phase
transition in the early universe, or cosmic superstrings arising from brane
inflation, to the cosmic 21 cm power spectrum at redshifts z > 30. Future
experiments can exploit this effect to constrain the cosmic string tension Gu
and probe virtually the entire brane inflation model space allowed by current
observations. Although current experiments with a collecting area of ~ 1 km^2
will not provide any useful constraints, future experiments with a collecting
area of 10^4-10^6 km^2 covering the cleanest 10% of the sky can in principle
constrain cosmic strings with tension Gu > 10^(-10) to 10^(-12)
(superstring/phase transition mass scale >10^13 GeV).
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 02:24:15 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"Khatri",
"Rishi",
""
],
[
"Wandelt",
"Benjamin D.",
""
]
] | [
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] |
801.4407 | Raza Syed M | Erica Walker and Raza M. Syed | Tiger Tales: A Critical Examination of the Tiger's Enclosure at the San
Francisco Zoo | 4 pages, 1 figure | null | null | null | physics.soc-ph physics.ed-ph | null | Given the recent tragedy involving a 350 pound Siberian Tiger and the death
of teenager Carlos Souza Jr., one must ask a fundamental question: Can a tiger
overcome an obstacle that is thirty-three feet away and twelve and a half feet
tall? Are these dimensions sufficient enough to protect the zoo-visitors from a
potential escape and/or attack? To answer these questions we use simple
two-dimensional projectile motion to find the minimum velocity a tiger needs in
order to clear the obstacle. With our results we conclude that it is highly
likely that the tiger was able to leap over the obstacle with ease!
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 01:11:59 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Walker",
"Erica",
""
],
[
"Syed",
"Raza M.",
""
]
] | [
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] |
801.4408 | Brendon Brewer | Brendon J. Brewer | Getting Your Eye In: A Bayesian Analysis of Early Dismissals in Cricket | Submitted. Latest version includes more quantitative results.
Software available from http://web.maths.unsw.edu.au/~brewer/ | null | null | null | stat.AP physics.data-an | null | A Bayesian Survival Analysis method is motivated and developed for analysing
sequences of scores made by a batsman in test or first class cricket. In
particular, we expect the presence of an effect whereby the distribution of
scores has more probability near zero than a geometric distribution, due to the
fact that batting is more difficult when the batsman is new at the crease. A
Metropolis-Hastings algorithm is found to be efficient at estimating the
proposed parameters, allowing us to quantify exactly how large this
early-innings effect is, and how long a batsman needs to be at the crease in
order to ``get their eye in''. Applying this model to several modern players
shows that a batsman is typically only playing at about half of their potential
ability when they first arrive at the crease, and gets their eye in
surprisingly quickly. Additionally, some players are more ``robust'' (have a
smaller early-innings effect) than others, which may have implications for
selection policy.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 01:12:58 GMT"
},
{
"version": "v2",
"created": "Mon, 26 May 2008 06:30:54 GMT"
}
] | 2008-05-26T00:00:00 | [
[
"Brewer",
"Brendon J.",
""
]
] | [
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801.4409 | Li-Gang Wang | Li-Gang Wang | The equivalent medium theory within the linear response region | 11pages, 2 figures | null | null | null | physics.optics physics.class-ph | null | In this paper, we present the equivalent medium theory by using the linear
response theory. It is found that, under the condition of the linear response,
a series of different media with different refractive indices $n_{i}(\omega)$
and lengths $d_{i}$ can be equivalent to an effective medium with the
volume-averaged refractive index $\frac{1}{D}\sum_{i=1}^{N}n_{i}(\omega)d_{i}$
and the total length $D=\sum_{i=1i}^{N}d_{i}$,where $N$ is the number of
different media. Based on this equivalent theory, it is a simple but very
useful method to design the effective medium with any desirable dispersion
properties. As an example, we present a proposal to obtain the enhancement or
reduction of the refractive index without absorption and the large dispersion
without obvious absorption by assembling different linear dispersive gain and
absorptive media.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 01:16:43 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Wang",
"Li-Gang",
""
]
] | [
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801.441 | Yuzo Maruyama | Yuzo Maruyama, Edward I. George | Fully Bayes factors with a generalized g-prior | Published in at http://dx.doi.org/10.1214/11-AOS917 the Annals of
Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Annals of Statistics 2011, Vol. 39, No. 5, 2740-2765 | 10.1214/11-AOS917 | IMS-AOS-AOS917 | stat.ME math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the normal linear model variable selection problem, we propose selection
criteria based on a fully Bayes formulation with a generalization of Zellner's
$g$-prior which allows for $p>n$. A special case of the prior formulation is
seen to yield tractable closed forms for marginal densities and Bayes factors
which reveal new model evaluation characteristics of potential interest.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 01:20:08 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Sep 2010 01:57:16 GMT"
},
{
"version": "v3",
"created": "Fri, 5 Aug 2011 05:20:01 GMT"
},
{
"version": "v4",
"created": "Thu, 23 Feb 2012 08:38:37 GMT"
}
] | 2012-02-24T00:00:00 | [
[
"Maruyama",
"Yuzo",
""
],
[
"George",
"Edward I.",
""
]
] | [
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] |
801.4411 | Avinash Kolli | Avinash Kolli, Simon C. Benjamin, Jose Garcia Coello, Sougato Bose and
Brendon W. Lovett | Large Spin Entangled Current from a Passive Device | 9 pages, 4 figures; Minor corrections made to text and now submitted
to New Journal of Physics | New J. Phys. 11 (2009) 013018. | 10.1088/1367-2630/11/1/013018 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a large entangled current can be produced from a very simple
passive device: a cluster of three resonant quantum dots, tunnel coupled to one
input lead and two output leads. The device can function in a `clean' mode,
when almost all emitted electrons are paired in Bell states, or a `dirty' mode
with a far higher emission rate but a significant portion of non-entangled
electrons. Subsequent charge detection can enhance performance by identifying
the pairs that are most likely to be entangled. The device is robust to
specific choice of system parameters and therefore lends itself to immediate
experimental demonstration. Applications include quantum repeaters and
unconditionally secure interfaces.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 01:23:03 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Aug 2008 23:23:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kolli",
"Avinash",
""
],
[
"Benjamin",
"Simon C.",
""
],
[
"Coello",
"Jose Garcia",
""
],
[
"Bose",
"Sougato",
""
],
[
"Lovett",
"Brendon W.",
""
]
] | [
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] |
801.4412 | Simon F. Ross | Julian Le Witt and Simon F. Ross | Asymptotically Plane Wave Spacetimes and their Actions | 18 pages, v2: references added, v3: small changes to concluding
discussion, final version to appear in journal | JHEP 0804:084,2008 | 10.1088/1126-6708/2008/04/084 | DCPT-08/03 | hep-th gr-qc | null | We propose a definition of asymptotically plane wave spacetimes in vacuum
gravity in terms of the asymptotic falloff of the metric, and discuss the
relation to previously constructed exact solutions. We construct a well-behaved
action principle for such spacetimes, using the formalism developed by Mann and
Marolf. We show that this action is finite on-shell and that the variational
principle is well-defined for solutions of vacuum gravity satisfying our
asymptotically plane wave falloff conditions.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 17:02:50 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 12:26:47 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Apr 2008 16:03:44 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Witt",
"Julian Le",
""
],
[
"Ross",
"Simon F.",
""
]
] | [
-0.0691013411,
0.0696869493,
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] |
801.4413 | Clement Baruteau | C. Baruteau (CE-Saclay), F. Masset (CE-Saclay & IAUNAM) | Type I planetary migration in a self-gravitating disk | 42 pages, 17 figures, accepted for publication in ApJ | null | 10.1086/529487 | null | astro-ph | null | We investigate the tidal interaction between a low-mass planet and a
self-gravitating protoplanetary disk, by means of two-dimensional hydrodynamic
simulations. We first show that considering a planet freely migrating in a disk
without self-gravity leads to a significant overestimate of the migration rate.
The overestimate can reach a factor of two for a disk having three times the
surface density of the minimum mass solar nebula. Unbiased drift rates may be
obtained only by considering a planet and a disk orbiting within the same
gravitational potential. In a second part, the disk self-gravity is taken into
account. We confirm that the disk gravity enhances the differential Lindblad
torque with respect to the situation where neither the planet nor the disk
feels the disk gravity. This enhancement only depends on the Toomre parameter
at the planet location. It is typically one order of magnitude smaller than the
spurious one induced by assuming a planet migrating in a disk without
self-gravity. We confirm that the torque enhancement due to the disk gravity
can be entirely accounted for by a shift of Lindblad resonances, and can be
reproduced by the use of an anisotropic pressure tensor. We do not find any
significant impact of the disk gravity on the corotation torque.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 02:09:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Baruteau",
"C.",
"",
"CE-Saclay"
],
[
"Masset",
"F.",
"",
"CE-Saclay & IAUNAM"
]
] | [
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] |
801.4414 | Raza Syed M | Raza M. Syed | Problems and Solutions in a Graduate Course in Classical Electrodynamics
(1) | 64 pages, no figures | null | null | null | physics.class-ph physics.gen-ph | null | The following is the very first set of the series in 'Problems and Solutions
in a Graduate Course in Classical Electrodynamics'. In each of the sets of the
problems we intend to follow a theme, which not only makes it unique but also
deals with the investigation of a certain class of problems in a thorough and
rigorous manner. Figures are not included.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 01:38:42 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Syed",
"Raza M.",
""
]
] | [
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] |
801.4415 | Hamilton | Colin S. Wallace, Andrew J. S. Hamilton, Gavin Polhemus (JILA) | Huge entropy production inside black holes | Version 2: Title, abstract, introduction, figure 2, and discussion
completely rewritten. Body of text largely unchanged. Version 3: Paper has
been split into two. This paper now confines itself to presenting the general
relativistic model. A companion paper, arXiv:0903.2290, discusses the quantum
gravity implications | null | null | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the entropy created by Ohmic dissipation inside an accreting
charged black hole may exceed the Bekenstein-Hawking entropy by a large factor.
If the black hole subsequently evaporates, radiating only the
Bekenstein-Hawking entropy, then the black hole appears to destroy entropy,
violating the second law of thermodynamics. A companion paper discusses the
implications of this startling result. Bousso's covariant entropy bound is not
violated.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 02:59:25 GMT"
},
{
"version": "v2",
"created": "Thu, 15 May 2008 00:25:11 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Mar 2009 23:43:05 GMT"
}
] | 2009-03-13T00:00:00 | [
[
"Wallace",
"Colin S.",
"",
"JILA"
],
[
"Hamilton",
"Andrew J. S.",
"",
"JILA"
],
[
"Polhemus",
"Gavin",
"",
"JILA"
]
] | [
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801.4416 | Jared Weinstein | Jared Weinstein | Hilbert modular forms with prescribed ramification | 30 pages, published version | Int. Math. Res. Not., (2009) 1388-1420 | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $K$ be a totally real field. In this article we present an asymptotic
formula for the number of Hilbert modular cusp forms $f$ with given
ramification at every place $v$ of $K$. When $v$ is an infinite place, this
means specifying the weight of $f$ at $k$, and when $v$ is finite, this means
specifying the restriction to inertia of the local Weil-Deligne representation
attached to $f$ at $v$. Our formula shows that with essentially finitely many
exceptions, the cusp forms of $K$ exhibit every possible sort of ramification
behavior, thus generalizing a theorem of Khare and Prasad. From this fact we
compute the minimal field over which a modular Jacobian becomes semi-stable.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 02:00:56 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 00:32:40 GMT"
},
{
"version": "v3",
"created": "Wed, 13 Feb 2008 00:30:38 GMT"
},
{
"version": "v4",
"created": "Tue, 2 Jun 2009 06:04:32 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Weinstein",
"Jared",
""
]
] | [
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801.4417 | Wei Lianfu | L.F. Wei, J.R. Johansson, L.X. Cen, S. Ashhab, Franco Nori | Controllable coherent population transfers in superconducting qubits for
quantum computing | 4 pages, 6 figures. to appear in Physical Review Letters | Phys. Rev. Lett. 100, 113601 (2008) | 10.1103/PhysRevLett.100.113601 | null | quant-ph cond-mat.mes-hall cond-mat.supr-con cs.GT | null | We propose an approach to coherently transfer populations between selected
quantum states in one- and two-qubit systems by using controllable
Stark-chirped rapid adiabatic passages (SCRAPs). These {\it evolution-time
insensitive} transfers, assisted by easily implementable single-qubit
phase-shift operations, could serve as elementary logic gates for quantum
computing. Specifically, this proposal could be conveniently demonstrated with
existing Josephson phase qubits. Our proposal can find an immediate application
in the readout of these qubits. Indeed, the broken parity symmetries of the
bound states in these artificial "atoms" provide an efficient approach to
design the required adiabatic pulses.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 02:14:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wei",
"L. F.",
""
],
[
"Johansson",
"J. R.",
""
],
[
"Cen",
"L. X.",
""
],
[
"Ashhab",
"S.",
""
],
[
"Nori",
"Franco",
""
]
] | [
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] |
801.4418 | Emi Miyata | Emi Miyata, Kuniaki Masai, John P. Hughes | Evidence for Resonance Line Scattering in the Suzaku X-ray Spectrum of
the Cygnus Loop | 10 pages, 5 figures. accepted for Publications of the Astronomical
Society of Japan | null | 10.1093/pasj/60.3.521 | null | astro-ph | null | We present an analysis of the Suzaku observation of the northeastern rim of
the Cygnus Loop supernova remnant. The high detection efficiency together with
the high spectral resolution of the Suzaku X-ray CCD camera enables us to
detect highly-ionized C and N emission lines from the Cygnus Loop. Given the
significant plasma structure within the Suzaku field of view, we selected the
softest region based on ROSAT observations. The Suzaku spectral data are well
characterized by a two-component non-equilibrium ionization model with
different best-fit values for both the electron temperature and ionization
timescale. Abundances of C to Fe are all depleted to typically 0.23 times solar
with the exception of O. The abundance of O is relatively depleted by an
additional factor of two compared with other heavy elements. We found that the
resonance-line-scattering optical depth for the intense resonance lines of O is
significant and, whereas the optical depth for other resonance lines is not as
significant, it still needs to be taken into account for accurate abundance
determination.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 02:29:39 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Miyata",
"Emi",
""
],
[
"Masai",
"Kuniaki",
""
],
[
"Hughes",
"John P.",
""
]
] | [
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] |
801.4419 | Anatolii Mal'shukov | A.G. Mal'shukov, C.S. Chu | Spin-Hall effects in a Josephson contact | 4 pages | null | 10.1103/PhysRevB.78.104503 | null | cond-mat.mes-hall cond-mat.supr-con | null | The Josephson tunneling through a 2D normal contact with the spin-orbit split
conduction band has been studied in the diffusive regime. Linearized Usadel
equations for triplet components of the pairing function revealed a striking
similarity to the equations of spin diffusion driven by the electric field in
normal metals. Consequently, we predict that the out-of-plane spin-Hall
polarization accumulates towards lateral sample edges and the in-plane
polarization is finite throughout the entire normal region. At the same time,
the spin-Hall current is absent in the considered case of the stationary
Josephson effect.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 03:04:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mal'shukov",
"A. G.",
""
],
[
"Chu",
"C. S.",
""
]
] | [
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] |
801.442 | Shinya Matsuzaki | Lauris Baum, Paul H. Frampton and Shinya Matsuzaki | Constraints on Deflation from the Equation of State of Dark Energy | 23 pages, 3 figures, typos fixed | JCAP 0804:032,2008 | 10.1088/1475-7516/2008/04/032 | null | hep-th astro-ph gr-qc hep-ph | null | In cyclic cosmology based on phantom dark energy the requirement that our
universe satisfy a CBE-condition ({\it Comes Back Empty}) imposes a lower bound
on the number $N_{\rm cp}$ of causal patches which separate just prior to
turnaround. This bound depends on the dark energy equation of state $w = p/\rho
= -1 - \phi$ with $\phi > 0$. More accurate measurement of $\phi$ will
constrain $N_{\rm cp}$. The critical density $\rho_c$ in the model has a lower
bound $\rho_c \ge (10^9 {\rm GeV})^4$ or $\rho_c \ge (10^{18} {\rm GeV})^4$
when the smallest bound state has size $10^{-15}$m, or $10^{-35}$m,
respectively.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 03:46:53 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 23:32:39 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Baum",
"Lauris",
""
],
[
"Frampton",
"Paul H.",
""
],
[
"Matsuzaki",
"Shinya",
""
]
] | [
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801.4421 | Alex Buchel | Alex Buchel | Shear viscosity of boost invariant plasma at finite coupling | 33 pages, no figures; v2: references added, typos corrected | Nucl.Phys.B802:281-306,2008 | 10.1016/j.nuclphysb.2008.03.009 | UWO-TH-08/2 | hep-th | null | We discuss string theory alpha' corrections in the dual description of the
expanding boost invariant N=4 supersymmetric Yang-Mills plasma at strong
coupling. We compute finite 't Hooft coupling corrections to the shear
viscosity and find that it disagrees with the equilibrium correlation function
computations. We comment on the possible source of the discrepancy.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 03:49:45 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 18:27:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Buchel",
"Alex",
""
]
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] |
801.4422 | Harry K. Hahn | Harry K. Hahn | The distribution of natural numbers divisible by 2,3,5,11,13 and 17 on
the Square Root Spiral | 12 pages, 6 figures. arXiv admin note: substantial text overlap with
arXiv:0712.2184 | null | null | null | math.GM | null | The natural numbers divisible by the Prime Factors 2, 3, 5, 11, 13 and 17 lie
on defined spiral graphs, which run through the Square Root Spiral. A
mathematical analysis shows, that these spiral graphs are defined by specific
quadratic polynomials. Basically all natural number which are divisible by the
same prime factor lie on such spiral graphs. And these spiral graphs can be
assigned to a certain number of Spiral Graph Systems, which have a defined
spatial orientation to each other. This document represents a supplementation
to my detailed introduction study to the Square Root Spiral, and it contains
the missing diagrams and analyses, showing the distribution of the natural
numbers divisible by 2, 3, 5, 11, 13 and 17 on the Square Root Spiral. My
introduction study to the Square Root Spiral can be found in the arxiv-archive.
The title of this study : The ordered distribution of the natural numbers on
the Square Root Spiral.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 04:38:41 GMT"
}
] | 2019-07-18T00:00:00 | [
[
"Hahn",
"Harry K.",
""
]
] | [
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] |
801.4423 | Manas Tungare | Manas Tungare, Manuel Perez-Quinones | It's Not What You Have, But How You Use It: Compromises in Mobile Device
Use | null | null | null | null | cs.HC | null | As users begin to use many more devices for personal information management
(PIM) than just the traditional desktop computer, it is essential for HCI
researchers to understand how these devices are being used in the wild and
their roles in users' information environments. We conducted a study of 220
knowledge workers about their devices, the activities they performed on each,
and the groups of devices used together. Our findings indicate that several
devices are often used in groups; integrated multi-function portable devices
have begun to replace single-function devices for communication (e.g. email and
IM). Users use certain features opportunistically because they happen to be
carrying a multi-function device with them. The use of multiple devices and
multi-function devices is fraught with compromises as users must choose and
make trade-offs among various factors.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 04:42:26 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Tungare",
"Manas",
""
],
[
"Perez-Quinones",
"Manuel",
""
]
] | [
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] |
801.4424 | Herve Bouy | H. Bouy, E. L. Martin, W. Brandner, T. Forveille, X. Delfosse, N.
Huelamo, G. Basri, J. Girard, M.-R. Zapatero Osorio, M. Stumpf, A. Ghez, L.
Valdivielso, F. Marchis, A.J. Burgasser, K. Cruz | Follow-up observations of binary ultra-cool dwarfs | 13 pages, 6 Tables, 4 Figures, Accepted for A&A, reference pb
corrected | null | 10.1051/0004-6361:20078803 | null | astro-ph | null | Astrometric observations of resolved binaries provide estimates of orbital
periods and will eventually lead to measurement of dynamical masses. Only a few
very low mass star and brown dwarf masses have been measured to date, and the
mass-luminosity relation still needs to be calibrated.
We have monitored 14 very low mass multiple systems for several years to
confirm their multiplicity and, for those with a short period, derive accurate
orbital parameters and dynamical mass estimates.
We have used high spatial resolution images obtained at the Paranal, Lick and
HST observatories to obtain astrometric and photometric measurements of the
multiple systems at several epochs. The targets have periods ranging from 5 to
200 years, and spectral types in the range M7.5 - T5.5.
All of our 14 multiple systems are confirmed as common proper motion pairs.
One system (2MASSW J0920122+351742) is not resolved in our new images, probably
because the discovery images were taken near maximum elongation. Six systems
have periods short enough to allow dynamical mass measurements within the next
15 to 20years. We estimate that only 8% of the ultracool dwarfs in the solar
neighborhood are binaries with separations large enough to be resolved, and yet
periods short enough to derive astrometric orbital fits over a reasonable time
frame with current instrumentation. A survey that doubles the number of
ultracool dwarfs observed with high angular resolution is called for to
discover enough binaries for a first attempt to derive the mass-luminosity
relationship for very low-mass stars and brown dwarfs.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 04:39:27 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 20:49:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bouy",
"H.",
""
],
[
"Martin",
"E. L.",
""
],
[
"Brandner",
"W.",
""
],
[
"Forveille",
"T.",
""
],
[
"Delfosse",
"X.",
""
],
[
"Huelamo",
"N.",
""
],
[
"Basri",
"G.",
""
],
[
"Girard",
"J.",
""
],
[
"Osorio",
"M. -R. Zapatero",
""
],
[
"Stumpf",
"M.",
""
],
[
"Ghez",
"A.",
""
],
[
"Valdivielso",
"L.",
""
],
[
"Marchis",
"F.",
""
],
[
"Burgasser",
"A. J.",
""
],
[
"Cruz",
"K.",
""
]
] | [
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] |
801.4425 | Laura Valentina Spinolo | Stefano Bianchini and Laura V. Spinolo | Invariant manifolds for a singular ordinary differential equation | 35 pages, more general case considered | null | null | Preprint SISSA 04/2008/M | math.CA math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the singular ordinary differential equation
$$
\frac{d U}{d t} = f (U) / z (U) + g (U),
$$ where $U \in R^N$, the functions $f \in R^N $ and $g \in R^N $ are of
class $C^2$ and $z $ is a real valued $C^2$ function. The equation is singular
in the sense that $z (U)$ can attain the value 0. We focus on the solutions of
the singular ODE that belong to a small neighborhood of a point $\bar U$ such
that $f (\bar U) = g (\bar U) = \vec 0$, $z (\bar U) =0$. We investigate the
existence of manifolds that are locally invariant for the singular ODE and that
contain orbits with a suitable prescribed asymptotic behaviour. Under suitable
hypotheses on the set $\{U: z (U) = 0 \}$, we extend to the case of the
singular ODE the definitions of center manifold, center stable manifold and of
uniformly stable manifold. An application of our analysis concerns the study of
the viscous profiles with small total variation for a class of mixed
hyperbolic-parabolic systems in one space variable. Such a class includes the
compressible Navier Stokes equation.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 04:43:04 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Mar 2009 09:38:37 GMT"
}
] | 2009-03-25T00:00:00 | [
[
"Bianchini",
"Stefano",
""
],
[
"Spinolo",
"Laura V.",
""
]
] | [
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] |
801.4426 | Tim Gould | Tim Gould and Ken Simpkins and John F. Dobson | A theoretical and semiemprical correction to the long-range dispersion
power law of stretched graphite | null | Phys. Rev. B 77, 165134 (2008) | 10.1103/PhysRevB.77.165134 | null | cond-mat.mtrl-sci | null | In recent years intercalated and pillared graphitic systems have come under
increasing scrutiny because of their potential for modern energy technologies.
While traditional \emph{ab initio} methods such as the LDA give accurate
geometries for graphite they are poorer at predicting physicial properties such
as cohesive energies and elastic constants perpendicular to the layers because
of the strong dependence on long-range dispersion forces. `Stretching' the
layers via pillars or intercalation further highlights these weaknesses. We use
the ideas developed by [J. F. Dobson et al, Phys. Rev. Lett. {\bf 96}, 073201
(2006)] as a starting point to show that the asymptotic $C_3 D^{-3}$ dependence
of the cohesive energy on layer spacing $D$ in bigraphene is universal to all
graphitic systems with evenly spaced layers. At spacings appropriate to
intercalates, this differs from and begins to dominate the $C_4 D^{-4}$ power
law for dispersion that has been widely used previously. The corrected power
law (and a calculated $C_3$ coefficient) is then unsuccesfully employed in the
semiempirical approach of [M. Hasegawa and K. Nishidate, Phys. Rev. B {\bf 70},
205431 (2004)] (HN). A modified, physicially motivated semiempirical method
including some $C_4 D^{-4}$ effects allows the HN method to be used
successfully and gives an absolute increase of about $2-3%$ to the predicted
cohesive energy, while still maintaining the correct $C_3 D^{-3}$ asymptotics.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 05:04:56 GMT"
}
] | 2012-08-28T00:00:00 | [
[
"Gould",
"Tim",
""
],
[
"Simpkins",
"Ken",
""
],
[
"Dobson",
"John F.",
""
]
] | [
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] |
801.4427 | Masashi Wakamatsu | M. Wakamatsu and Y. Nakakoji | On the physics behind the form factor ratio $\mu_p G_E^p (Q^2) / G_M^p
(Q^2)$ | 12 pages, 5 figures. version to appear in J. Phys. G.: Nucl. Part.
Phys | J.Phys.G35:125003,2008 | 10.1088/0954-3899/35/12/125003 | OU-HET-597 | nucl-th hep-ex hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that there exist two natural definitions of the nucleon
magnetization densities : the density $\rho_M^K (r)$ introduced in Kelly's
phenomenological analysis and theoretically more standard one $\rho_M (r)$. We
can derive an explicit analytical relation between them, although Kelly's
density is more useful to disentangle the physical origin of the different
$Q^2$ dependence of the Sachs electric and magnetic form factors of the
nucleon. We evaluate both of $\rho_M (r)$ and $\rho_M^K (r)$ as well as the
charge density $\rho_{ch}(r)$ of the proton within the framework of the chiral
quark soliton model, to find a noticeable qualitative difference between
$\rho_{ch}(r)$ and $\rho_M^K (r)$, which is just consistent with Kelly's result
obtained from the empirical information on the Sachs electric and magnetic form
factors of the proton.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 05:25:16 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Oct 2008 08:20:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wakamatsu",
"M.",
""
],
[
"Nakakoji",
"Y.",
""
]
] | [
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-0.0918330401,
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0.0114554008,
-0.0165987629,
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] |
801.4428 | Jun'ichi Wakou | Jun'ichi Wakou, Akinori Ochiai, Masaharu Isobe | A Langevin Approach to One-Dimensional Granular Media Fluidized by
Vibrations | 11 pages, 3 figures, to be published in J. Phys. Soc. Jpn | J. Phys. Soc. Jpn. 77, 034402 (2008) | 10.1143/JPSJ.77.034402 | null | cond-mat.soft cond-mat.stat-mech | null | We present a Langevin approach to describe the steady-state dynamics of
one-dimensional granular media fluidized by a vibrating bottom plate. We adopt
a linear Langevin equation to describe the motion of the center of mass. Within
this framework, we derive analytical expressions for several macroscopic
quantities. We also predict the power spectrum for the height of the center of
mass. We find good agreement between our theoretical predictions and extensive
event-driven molecular dynamics simulations.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 05:27:32 GMT"
}
] | 2010-03-29T00:00:00 | [
[
"Wakou",
"Jun'ichi",
""
],
[
"Ochiai",
"Akinori",
""
],
[
"Isobe",
"Masaharu",
""
]
] | [
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] |
801.4429 | Takayuki Morifuji | Teruaki Kitano, Takayuki Morifuji | $L^2$-torsion invariants and the Magnus representation of the mapping
class group | 14 pages | null | null | null | math.GT | null | In this paper, we study a series of $L^2$-torsion invariants from the
viewpoint of the mapping class group of a surface. We establish some vanishing
theorems for them. Moreover we explicitly calculate the first two invariants
and compare them with hyperbolic volumes.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 05:36:58 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Kitano",
"Teruaki",
""
],
[
"Morifuji",
"Takayuki",
""
]
] | [
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] |
801.443 | Vitaly Alperovich L | D. A. Orlov, V. L. Alperovich, A. S. Terekhov | Magnetically induced spin-dependent photoemission from p-GaAs(Cs,O) into
vacuum | 7 pages, 6 figures, published version | Phys. Rev. B 77, 205325 (2008) | 10.1103/PhysRevB.77.205325 | null | cond-mat.mes-hall | null | A spin-dependent emission of optically oriented electrons from p-GaAs(Cs,O)
into vacuum was experimentally observed in a magnetic field normal to the
surface. This phenomenon is explained within the model which takes into account
the jump in the electron g factor at the semiconductor-vacuum interface. Due to
this jump, the effective electron affinity on the semiconductor surface depends
on the mutual direction of optically oriented electron spins and the magnetic
field, resulting in the spin-dependent photoemission. It is demonstrated that
the observed effect can be used for the determination of spin diffusion length
in semiconductors.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 05:41:42 GMT"
},
{
"version": "v2",
"created": "Sat, 24 May 2008 08:35:15 GMT"
}
] | 2008-05-24T00:00:00 | [
[
"Orlov",
"D. A.",
""
],
[
"Alperovich",
"V. L.",
""
],
[
"Terekhov",
"A. S.",
""
]
] | [
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] |
801.4431 | Xinping Xu | Xinping Xu, Feng Liu | Phase space patterns of quantum transport on ordered and disordered
networks | Syntax corrected and more discussion added. Accepted for publication
in Phys. ReV. A | Phys. Rev. A 77, 062318 (2008) | 10.1103/PhysRevA.77.062318 | null | quant-ph | null | In this paper, we consider the quantum-mechanical phase space patterns on
ordered and disordered networks. For ordered networks in which each node is
connected to its 2m nearest neighbors (m on either side), the phase space
quasi-probability of Wigner function shows various patterns. In the long time
limit, on even-numbered networks, we find an asymmetric quasi-probability
between the node and its opposite node. This asymmetry depends on the network
parameters and specific phase space positions. For disordered networks in which
each edge is rewired with probability p>0, the phase space displays regional
localization on the initial node.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 05:51:21 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Apr 2008 01:45:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Xu",
"Xinping",
""
],
[
"Liu",
"Feng",
""
]
] | [
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] |
801.4432 | Steven Sam | Steven V Sam | A bijective proof for a theorem of Ehrhart | 14 pages, 4 figures; v5: polished exposition, final version | Amer. Math. Monthly 116 (2009), no. 8, 688-701 | 10.4169/193009709X460813 | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a new proof for a theorem of Ehrhart regarding the
quasi-polynomiality of the function that counts the number of integer points in
the integral dilates of a rational polytope. The proof involves a geometric
bijection, inclusion-exclusion, and recurrence relations, and we also prove
Ehrhart reciprocity using these methods.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 06:35:48 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 22:14:41 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Feb 2008 01:56:50 GMT"
},
{
"version": "v4",
"created": "Sat, 8 Mar 2008 18:58:13 GMT"
},
{
"version": "v5",
"created": "Fri, 27 Jun 2008 08:12:10 GMT"
}
] | 2012-12-27T00:00:00 | [
[
"Sam",
"Steven V",
""
]
] | [
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] |
801.4433 | Rajendra Zope | Rajendra R. Zope, Tunna Baruah, Mark R. Pederson, and B. I. Dunlap
(The University of Texas at El Paso and US Naval Research Laboratory,
Washington, DC) | Static dielectric response of icosahedral fullerenes from C60 to C2160
by an all electron density functional theory | RevTex, 3 figures | null | 10.1103/PhysRevB.77.115452 | null | cond-mat.mtrl-sci physics.atm-clus | null | The static dielectric response of C60, C180, C240, C540, C720, C960, C1500,
and C2160 fullerenes is characterized by an all-electron density-functional
method. First, the screened polarizabilities of C60, C180, C240, and C540, are
determined by the finite-field method using Gaussian basis set containing 35
basis functions per atom. In the second set of calculations, the unscreened
polarizabilities are calculated for fullerenes C60 through C2160 from the
self-consistent Kohn-Sham orbitals and eigen-values using the sum-over-states
method. The approximate screened polarizabilities, obtained by applying a
correction determined within linear response theory show excellent agreement
with the finite-field polarizabilities. The static dipole polarizability per
atom in C2160 is (4 Angstrom^3) three times larger than that in C60 (1.344
Angstrom^3). Our results reduce the uncertainty in various theoretical models
used previously to describe the dielectric response of fullerenes and show that
quantum size effects in polarizability are significantly smaller than
previously thought.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 06:36:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zope",
"Rajendra R.",
"",
"The University of Texas at El Paso and US Naval Research Laboratory,\n Washington, DC"
],
[
"Baruah",
"Tunna",
"",
"The University of Texas at El Paso and US Naval Research Laboratory,\n Washington, DC"
],
[
"Pederson",
"Mark R.",
"",
"The University of Texas at El Paso and US Naval Research Laboratory,\n Washington, DC"
],
[
"Dunlap",
"B. I.",
"",
"The University of Texas at El Paso and US Naval Research Laboratory,\n Washington, DC"
]
] | [
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] |
801.4434 | M\'at\'e Csan\'ad | Mate Csanad, Boris Tomasik, Tamas Csorgo | Interplay among the azimuthally dependent HBT radii and the elliptic
flow | 7 pages, 4 figures, prepared with svjour.cls, accepted at Eur. Phys.
J. A | Eur.Phys.J.A37:111-119,2008 | 10.1140/epja/i2008-10605-7 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the elliptic flow and azimuthal dependence of the
correlation radii in the ellipsoidally symmetric generalization of the
Buda-Lund model. The elliptic flow is shown to depend only on the flow
anisotropy while in case of correlation radii both flow and space anisotropy
play an important role in determining their azimuthal oscillation. We also
outline a simple procedure for determining the parameters of the model from
data.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 07:46:00 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jun 2008 15:09:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Csanad",
"Mate",
""
],
[
"Tomasik",
"Boris",
""
],
[
"Csorgo",
"Tamas",
""
]
] | [
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] |
801.4435 | Michael Springborg | Michael Springborg and Bernard Kirtman | How much can donor/acceptor-substitution change the responses of long
push-pull systems to DC fields? | Accepted by Chem. Phys. Lett | null | 10.1016/j.cplett.2008.01.078 | null | cond-mat.mtrl-sci | null | Mathematical arguments are presented that give a unique answer to the
question in the title. Subsequently, the mathematical analysis is extended
using results of detailed model calculations that, in addition, throw further
light on the consequences of the analysis. Finally, through a comparison with
various recent studies, many of the latter are given a new interpretation.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 06:58:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Springborg",
"Michael",
""
],
[
"Kirtman",
"Bernard",
""
]
] | [
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] |
801.4436 | Jing Chen | J. Chen, Y. J. Chen, J. Fan, J. Liu, S. G. Chen, and X. T. He | Modulations to molecular high order harmonic generation by electron de
Broglie wave | 5 pages, 3 figures | null | null | null | physics.atom-ph physics.atm-clus | null | We present a new theory that the molecular high order harmonic generation in
an intense laser field is determined by molecular internal symmetry and
momentum distribution of the tunneling-ionized electron. The molecular internal
symmetry determines the quantum interference form of the returning electron
inside the molecule. The electron momentum distribution determines the relative
interference strength of each individual electron de Broglie wave. All
individual electron de Broglie wave interferences add together to collectively
modulate the molecular high harmonic generation. We specifically discuss the
suppression of the generation on adjacent harmonic orders and the dependence of
molecular high harmonic generation on laser intensities and molecular axis
alignment. Our theoretical results are in good consistency with the
experimental observations.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 07:03:29 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Chen",
"J.",
""
],
[
"Chen",
"Y. J.",
""
],
[
"Fan",
"J.",
""
],
[
"Liu",
"J.",
""
],
[
"Chen",
"S. G.",
""
],
[
"He",
"X. T.",
""
]
] | [
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] |
801.4437 | Hing Tong Cho | Hing-Tong Cho and Choon-Lin Ho | Self-Adjoint Extensions of the Hamiltonian Operator with Symmetric
Potentials which are Unbounded from Below | RevTex, 16 pages; title changed, extension scheme clarified | null | 10.1088/1751-8113/41/25/255308 | null | quant-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the self-adjoint extensions of the Hamiltonian operator with
symmetric potentials which go to $-\infty$ faster than $-|x|^{2p}$ with $p>1$
as $x\to\pm\infty$. In this extension procedure, one requires the Wronskian
between any states in the spectrum to approach to the same limit as
$x\to\pm\infty$. Then the boundary terms cancel and the Hamiltonian operator
can be shown to be hermitian. Discrete bound states with even and odd parities
are obtained. Since the Wronskian is not required to vanish asymptotically, the
energy eigenstates could be degenerate. Some explicit examples are given and
analyzed.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 07:11:57 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jun 2008 14:35:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cho",
"Hing-Tong",
""
],
[
"Ho",
"Choon-Lin",
""
]
] | [
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] |
801.4438 | Will Saunders | W. Saunders, P.R. Gillingham, A.J. McGrath, J.W.V. Storey, J.S.
Lawrence | PILOT: design and capabilities | 4 pages, Proceedings of 2nd ARENA conference 'The Astrophysical
Science Cases at Dome C', Potsdam, 17-21 September 2007 | null | 10.1051/eas:0833041 | null | astro-ph | null | The proposed design for PILOT is a general-purpose, wide-field 1 degree 2.4m,
f/10 Ritchey-Chretien telescope, with fast tip-tilt guiding, for use 0.5-25
microns. The design allows both wide-field and diffraction-limited use at these
wavelengths. The expected overall image quality, including median seeing, is
0.28-0.3" FWHM from 0.8-2.4 microns. Point source sensitivities are estimated.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 07:37:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Saunders",
"W.",
""
],
[
"Gillingham",
"P. R.",
""
],
[
"McGrath",
"A. J.",
""
],
[
"Storey",
"J. W. V.",
""
],
[
"Lawrence",
"J. S.",
""
]
] | [
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] |
801.4439 | Christopher J. Hillar | Matthias Aschenbrenner, Christopher J. Hillar | An Algorithm for Finding Symmetric Gr\"obner Bases in Infinite
Dimensional Rings | preliminary abstract, 10 pages | null | null | null | math.AC math.CO | null | A \textit{symmetric ideal} $I \subseteq R = K[x_1,x_2,...]$ is an ideal that
is invariant under the natural action of the infinite symmetric group. We give
an explicit algorithm to find Gr\"obner bases for symmetric ideals in the
infinite dimensional polynomial ring $R$. This allows for symbolic computation
in a new class of rings. In particular, we solve the ideal membership problem
for symmetric ideals of $R$.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 07:54:54 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Aschenbrenner",
"Matthias",
""
],
[
"Hillar",
"Christopher J.",
""
]
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] |
801.444 | Will Saunders | W. Saunders | PILOT and cosmic shear | 6 pages, Proceedings of 2nd ARENA conference 'The Astrophysical
Science Cases at Dome C', Potsdam, 17-21 September 2007 | null | 10.1051/eas:0833036 | null | astro-ph | null | Cosmic shear offers a remarkbly clean way to measure the equation of state of
the Universe and its evolution. Resolution over a wide field is paramount, and
Antarctica offers unique possibilities in this respect. There is an order of
magnitude gain in speed over temperate sites, or a factor three in surface
density. This means that PILOT outperforms much larger telescopes elsewhere,
and can compete with the proposed DUNE space mission.
Keywords: Antarctic astronomy, Surveys, Adaptive optics, Weak lensing
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 07:51:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Saunders",
"W.",
""
]
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] |
801.4441 | Nami Sakai | Nami Sakai, Takeshi Sakai, Yuri Aikawa, and Satoshi Yamamoto | Detection of HCO2+ toward the Low-Mass Protostar IRAS 04368+2557 in
L1527 | To be published in ApJ(Letter) | Astrophys.J.675:L89-L92,2008 | 10.1086/533463 | null | astro-ph | null | The millimeter-wave rotational emission lines (4(04)-3(03) and 5(05)-4(04))
of protonated carbon dioxide, HCO2+(HOCO+), has been detected toward the
low-mass class 0 protostar IRAS 04368+2557 in L1527 with the IRAM 30 m
telescope. This is the first detection of HCO2+ except for the Galactic Center
clouds. The column density of HCO2+ averaged over the beam size (29") is
determined to be 7.6x10^10 cm^-2, assuming the rotational temperature of 12.3
K. The fractional abundance of gaseous CO2 relative to H2 is estimated from the
column density of HCO2+ with an aid of a simplified chemical model. If the
HCO2+ emission only comes from the evaporation region of CO2 near the protostar
(T>50 K), the fractional abundance of CO2 is estimated to be higher than
6.6x10^-4. This is comparable to the elemental abundance of carbon in
interstellar clouds, and hence, the direct evaporation of CO2 from dust grain
is unrealistic as a source of gaseous CO2 in L1527. A narrow line width of
HCO2+ also supports this. On the other hand, the fractional abundance of CO2 is
estimated to be 2.9x10^-7, if the source size is comparable to the beam size.
These results indicate that gaseous CO2 is abundant even in the low-mass
star-forming region. Possible production mechanisms of gaseous CO2 are
discussed.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 07:51:45 GMT"
}
] | 2011-02-11T00:00:00 | [
[
"Sakai",
"Nami",
""
],
[
"Sakai",
"Takeshi",
""
],
[
"Aikawa",
"Yuri",
""
],
[
"Yamamoto",
"Satoshi",
""
]
] | [
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801.4442 | Betsy Jane Becker | Betsy Jane Becker, Meng-Jia Wu | The Synthesis of Regression Slopes in Meta-Analysis | Published in at http://dx.doi.org/10.1214/07-STS243 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, 414-429 | 10.1214/07-STS243 | IMS-STS-STS243 | stat.ME | null | Research on methods of meta-analysis (the synthesis of related study results)
has dealt with many simple study indices, but less attention has been paid to
the issue of summarizing regression slopes. In part this is because of the many
complications that arise when real sets of regression models are accumulated.
We outline the complexities involved in synthesizing slopes, describe existing
methods of analysis and present a multivariate generalized least squares
approach to the synthesis of regression slopes.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 07:58:20 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Becker",
"Betsy Jane",
""
],
[
"Wu",
"Meng-Jia",
""
]
] | [
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] |
801.4443 | Imran Anwar | Usman Ali | Conjugacy Classes of 3-Braid Group B_3 | Changes in the new version are due to: (1) To relate this article to
"A note closed 3-braids",preprint, arXiv:0802.1072 by J. S. Birman and W. W.
Menasco. (2) Suggestions from Joan Birman to the Author through emails | null | null | null | math.GT math.GR | null | In this article we describe the summit sets in B_3, the smallest element in a
summit set and we compute the Hilbert series corresponding to conjugacy
classes.The results will be related to Birman-Menesco classification of knots
with braid index three or less than three.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 08:07:42 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Mar 2008 12:41:14 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Mar 2008 08:45:06 GMT"
}
] | 2008-03-19T00:00:00 | [
[
"Ali",
"Usman",
""
]
] | [
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] |
801.4444 | Hung The Diep | K. Akabli (LPTM), H. T. Diep (LPTM) | Temperature Dependence of the Spin Resistivity in Ferromagnetic Thin
Films | 11 pages, 18 figures, submitted for publication | PHYS. REV. B 77 (2008) 165433 | 10.1103/PhysRevB.77.165433 | null | cond-mat.mtrl-sci | null | The magnetic phase transition is experimentally known to give rise to an
anomalous temperature-dependence of the electron resistivity in ferromagnetic
crystals. Phenomenological theories based on the interaction between itinerant
electron spins and lattice spins have been suggested to explain these
observations. In this paper, we show by extensive Monte Carlo (MC) simulation
the behavior of the resistivity of the spin current calculated as a function of
temperature ($T$) from low-$T$ ordered phase to high-$T$ paramagnetic phase in
a ferromagnetic film. We analyze in particular effects of film thickness,
surface interactions and different kinds of impurities on the spin resistivity
across the critical region. The origin of the resistivity peak near the phase
transition is shown to stem from the existence of magnetic domains in the
critical region. We also formulate in this paper a theory based on the
Boltzmann's equation in the relaxation-time approximation. This equation can be
solved using numerical data obtained by our simulations. We show that our
theory is in a good agreement with our MC results. Comparison with experiments
is discussed.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 08:50:36 GMT"
}
] | 2010-05-11T00:00:00 | [
[
"Akabli",
"K.",
"",
"LPTM"
],
[
"Diep",
"H. T.",
"",
"LPTM"
]
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] |
801.4445 | Shun Fukushima | S. Fukushima, T. Sato, D. Akahoshi, H. Kuwahara | Comparative study of ordered and disordered Y1-xSrxCoO3-d | 3 pages, 3 figures, proceeding of 52nd Mangetism and Magnetic
Materials Conference (MMM 2007), published in Journal of Applied Physics | J. Appl. Phys. 103, 07F705 (2008) | 10.1063/1.2830615 | null | cond-mat.str-el | null | We have succeeded in preparing A-site ordered- and disordered-Y1/4Sr3/4CoO3-d
with various oxygen deficiencies delta, and have made comparative study of
their structural and physical properties. In the A-site ordered structure,
oxygen vacancies order, and d = 0.34 sample shows a weak ferromagnetic
transition beyond 300 K. On the other hand, in the A-site disordered structure,
no oxygen vacancy ordering is observed, and d = 0.16 sample shows a
ferromagnetic metallic transition around 150 K. A-site disordering destroys the
orderings of oxygen-vacancies and orbitals, leading to the strong modification
of the electronic phases.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 11:22:21 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Fukushima",
"S.",
""
],
[
"Sato",
"T.",
""
],
[
"Akahoshi",
"D.",
""
],
[
"Kuwahara",
"H.",
""
]
] | [
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] |
801.4446 | Alfio Bonanno | A.Bonanno, S.Benatti, R.Claudi, S.Desidera, R.Gratton, S.Leccia,
L.Paterno' | Detection of solar-like oscillations in the G5 subgiant mu-Herculis | 8 pages, 6 figures, ApJ to appear | null | 10.1086/528946 | null | astro-ph | null | A clear detection of excess of power, providing a substantial evidence for
solar-like oscillations in the G5 subgiant \muher{}, is presented. This star
was observed over seven nights with the SARG echelle spectrograph operating
with the 3.6-m Italian TNG Telescope, using an iodine absorption cell as a
velocity reference. A clear excess of power centered at 1.2 mHz, with peak
amplitudes of about 0.9 \ms in the amplitude spectrum is present. Fitting the
asymptotic relation to the power spectrum, a mode identification for the
$\ell=0,1,2,3$ modes in the frequency range $900-1600 \muHz$ is derived. The
most likely value for the large separation turns out to be 56.5 \muHz,
consistent with theoretical expectations. The mean amplitude per mode ($l=0,1$)
at peak power results to be $0.63 \rm m s^{-1}$, almost three times larger than
the solar one.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:13:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bonanno",
"A.",
""
],
[
"Benatti",
"S.",
""
],
[
"Claudi",
"R.",
""
],
[
"Desidera",
"S.",
""
],
[
"Gratton",
"R.",
""
],
[
"Leccia",
"S.",
""
],
[
"Paterno'",
"L.",
""
]
] | [
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] |
801.4447 | Sujin Babu | Sujin Babu, Jean-Christophe Gimel, Taco Nicolai | Diffusion limited cluster aggregation with irreversible flexible bonds | 12 pages, 13figures | The European Physical Journal E 27 3 (2008) 297-308 | null | null | cond-mat.soft | null | Irreversible diffusion limited cluster aggregation (DLCA) of hard spheres was
simulated using Brownian cluster dynamics. Bound spheres were allowed to move
freely within a specified range, but no bond breaking was allowed. The
structure and size distribution of the clusters was investigated before
gelation. The pair correlation function and the static structure factor of the
gels were determined as a function of the volume fraction and time. Bond
flexibility led to local densification of the clusters and the gels, with a
certain degree of order. At low volume fractions densification of the clusters
occurred during their growth, but at higher volume fractions it occurred mainly
after gelation. At very low volume fractions, the large scale structure
(fractal dimension), size distribution and growth kinetics of the clusters was
found to be close to that known for DLCA with rigid bonds. Restructuring of the
gels continued for long times, indicating that aging processes in systems with
strong attraction do not necessarily involve bond breaking. The mean square
displacement of particles in the gels was determined. It is shown to be highly
heterogeneous and to increase with decreasing volume fraction.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 17:00:16 GMT"
}
] | 2009-03-25T00:00:00 | [
[
"Babu",
"Sujin",
""
],
[
"Gimel",
"Jean-Christophe",
""
],
[
"Nicolai",
"Taco",
""
]
] | [
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] |
801.4448 | Hannah Schunker | H. Schunker, D.C. Braun, C. Lindsey, P.S. Cally | Physical Properties of Wave Motion in Inclined Magnetic Fields Within
Sunspot Penumbrae | 22 pages, 13 figures | null | 10.1007/s11207-008-9142-7 | null | astro-ph | null | At the surface of the Sun, acoustic waves appear to be affected by the
presence of strong magnetic fields in active regions. We explore the
possibility that the inclined magnetic field in sunspot penumbrae may convert
primarily vertically propagating acoustic waves into elliptical motion. We use
helioseismic holography to measure the modulus and phase of the correlation
between incoming acoustic waves and the local surface motion within two
sunspots. These correlations are modeled assuming the surface motion is
elliptical, and we explore the properties of the elliptical motion on the
magnetic field inclination. We also demonstrate that the phase shift of the
outward propagating waves is opposite to the phase shift of the inward
propagating waves in stronger, more vertical fields, but similar to the inward
phase shifts in weaker, more inclined fields.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:04:34 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Apr 2008 10:40:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schunker",
"H.",
""
],
[
"Braun",
"D. C.",
""
],
[
"Lindsey",
"C.",
""
],
[
"Cally",
"P. S.",
""
]
] | [
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] |
801.4449 | Yu-Gang Ma | Jiang-Hai Qian and Ding-Ding Han | Gravitation model for spatial network based on the heterogeneous node | 6 pages, 8 figures | null | null | null | physics.soc-ph | null | In this paper we consider nodes in network are heterogeneous and the link
between nodes is caused by the potential dynamical demand of the nodes. Such
demand can be measured by gravitation which increases with the heterogeneous
strength of node and decreases with the geographical distance. Based on this,
we propose a new model for spatial network from the view of gravitation. The
model is to maximize the potential dynamical demand of the whole network,
indicating the possible maximal efficiency of the network and the highest
profits that operators may gain. The model can vary its topology by changing
two parameters. A simulation for the Chinese city airline network is completed.
In the end of this article we discuss the significance and advantage of the
heterogeneous nodes.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:05:07 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Qian",
"Jiang-Hai",
""
],
[
"Han",
"Ding-Ding",
""
]
] | [
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] |
801.445 | Andrey Aleshin | A. N. Aleshin, I. P. Shcherbakov, E. L. Alexandrova, E. A. Lebedev | Effect of electric field on the photoluminescence of polymer-inorganic
nanoparticles composites | 5 pages, 5 figures. accepted for publication in Solid State
Communications | null | 10.1016/j.ssc.2008.01.040 | null | cond-mat.soft cond-mat.mtrl-sci | null | We report on the effect of electric field on the photoluminescence, PL, from
a composite consisting of a conjugated polymer mixed with zinc oxide
nanoparticles. We have found that in the absence of electric field PL emission
from the composite film has two maxima in the blue and green-yellow regions.
Application of a voltage bias to planar gold electrodes suppresses the
green-yellow emission and shifts the only PL emission maximum towards the blue
region. Current-voltage characteristics of the polymer-nanoparticles composite
exhibit the non-linear behavior typical of non-homogeneous polymer-inorganic
structures. Generation of excited states in the composite structure implies the
presence of several radiative recombination mechanisms including formation of
polymer-nanoparticle complexes including exciplex states and charge transfer
between the polymer and nanoparticle that can be controlled by an electric
field.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:06:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aleshin",
"A. N.",
""
],
[
"Shcherbakov",
"I. P.",
""
],
[
"Alexandrova",
"E. L.",
""
],
[
"Lebedev",
"E. A.",
""
]
] | [
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] |
801.4451 | Manuel Ruiz Marin | O. Broche, E. Jespers, C. Polcino Milies and M. Ruiz | Antisymmetric Elements in Group Rings II | null | null | null | null | math.RA | null | Let $R$ be a commutative ring, $G$ a group and $RG$ its group ring. Let $\vp
: RG\to RG$ denote the $R$-linear extension of an involution $\vp$ defined on
$G$. An element $x$ in $RG$ is said to be $\vp$-antisymmetric if $\vp (x) =
-x$. A characterization is given of when the $\vp$-antisymmetric elements of
$RG$ commute. This is a completion of earlier work.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:13:26 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Broche",
"O.",
""
],
[
"Jespers",
"E.",
""
],
[
"Milies",
"C. Polcino",
""
],
[
"Ruiz",
"M.",
""
]
] | [
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] |
801.4452 | Carsten Kramer | C. Kramer, R. Moreno, and A. Greve | Long-term observations of Uranus and Neptune at 90 GHz with the IRAM 30m
telescope - (1985 -- 2005) | accepted for publication in A&A | null | 10.1051/0004-6361:20077705 | null | astro-ph | null | The planets Uranus and Neptune with small apparent diameters are primary
calibration standards. We investigate their variability at ~90 GHz using
archived data taken at the IRAM 30m telescope during the 20 years period 1985
to 2005. We calibrate the planetary observations against non-variable secondary
standards (NGC7027, NGC7538, W3OH, K3-50A) observed almost simultaneously.
Between 1985 and 2005, the viewing angle of Uranus changed from south-pole to
equatorial. We find that the disk brightness temperature declines by almost 10%
(~2sigma) over this time span indicating that the south-pole region is
significantly brighter than average. Our finding is consistent with recent
long-term radio observations at 8.6 GHz by Klein & Hofstadter (2006). Both data
sets do moreover show a rapid decrease of the Uranus brightness temperature
during the year 1993, indicating a temporal, planetary scale change. We do not
find indications for a variation of Neptune's brightness temperature at the 8%
level. If Uranus is to be used as calibration source, and if accuracies better
than 10% are required, the Uranus sub-earth point latitude needs to be taken
into account.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:28:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kramer",
"C.",
""
],
[
"Moreno",
"R.",
""
],
[
"Greve",
"A.",
""
]
] | [
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] |
801.4453 | Alexander Knebe | Alexander Knebe (AIP) and Chris Power (Leicester) | On the Correlation between Spin Parameter and Halo Mass | 7 pages, accepted for publication in ApJ | null | 10.1086/586702 | null | astro-ph | null | We report on a correlation between virial mass M and spin parameter lambda
for dark matter halos forming at redshifts z > 10. We find that the spin
parameter decreases with increasing halo mass. Interestingly, our analysis
indicates that halos forming at later times do not exhibit such a strong
correlation, in agreement with the findings of previous studies. We briefly
discuss the implications of this correlation for galaxy formation at high
redshifts and the galaxy population we observe today.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:23:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Knebe",
"Alexander",
"",
"AIP"
],
[
"Power",
"Chris",
"",
"Leicester"
]
] | [
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] |
801.4454 | Fabian Heidrich-Meisner | F. Heidrich-Meisner, M. Rigol, A. Muramatsu, A.E. Feiguin, E. Dagotto | Ground-state reference systems for expanding correlated fermions in one
dimension | 8 pages Revtex4, 7 eps-figures, minor changes, additional references,
as published | Phys. Rev. A 78, 013620 (2008) | 10.1103/PhysRevA.78.013620 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the sudden expansion of strongly correlated fermions in a
one-dimensional lattice, utilizing the time-dependent density-matrix
renormalization group method. Our focus is on the behavior of experimental
observables such as the density, the momentum distribution function, and the
density and spin structure factors. As our main result, we show that
correlations in the transient regime can be accurately described by equilibrium
reference systems. In addition, we find that the expansion from a Mott
insulator produces distinctive peaks in the momentum distribution function at
|k| ~ pi/2, accompanied by the onset of power-law correlations.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:17:17 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Apr 2008 15:39:45 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Jul 2008 09:19:51 GMT"
}
] | 2008-07-18T00:00:00 | [
[
"Heidrich-Meisner",
"F.",
""
],
[
"Rigol",
"M.",
""
],
[
"Muramatsu",
"A.",
""
],
[
"Feiguin",
"A. E.",
""
],
[
"Dagotto",
"E.",
""
]
] | [
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] |
801.4455 | Rainer Arlt | R. Arlt | The generation and stability of magnetic fields in CP stars | Contribution presented at the CP/AP Workshop, Vienna, Austria in
September 2007 | null | null | null | astro-ph | null | A variety of magnetohydrodynamic mechanisms that may play a role in magnetic,
chemically peculiar (mCP) stars is reviewed. These involve dynamo mechanisms in
laminar flows as well as turbulent environments, and magnetic instabilities of
poloidal and toroidal fields as well as combinations of the two. While the
proto-stellar phase makes the survival of primordial fields difficult, the
variety of magnetic field configurations on mCP stars may be an indication for
that they are instability remnants, but there is no process which is clearly
superior in explaining the strong fields.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:30:06 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Arlt",
"R.",
""
]
] | [
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] |
801.4456 | Norbert Przybilla | N. Przybilla, M. F. Nieva, U. Heber, M. Firnstein, K. Butler, R.
Napiwotzki, H. Edelmann | LMC origin of the hyper-velocity star HE 0437-5439. Beyond the
supermassive black hole paradigm | 4 pages, 3 figures; accepted for publication by Astronomy &
Astrophysics | null | 10.1051/0004-6361:200809391 | null | astro-ph | null | Context: Hyper-velocity stars move so fast that only a supermassive black
hole (SMBH) seems to be capable to accelerate them. Hence the Galactic centre
(GC) is their only suggested place of origin. Edelmann et al. (2005) found the
early B-star HE0437-5439 to be too short-lived to have reached its current
position in the Galactic halo if ejected from the GC, except if being a blue
straggler. Its proximity to the LMC suggested an origin from this galaxy. Aims:
The chemical signatures of stars at the GC are significantly different from
those in the LMC. Hence, an accurate measurement of the abundance pattern of
HE0437-5439 will yield a new tight constraint on the place of birth of this
star. Methods: High-resolution spectra obtained with UVES on the VLT are
analysed using state-of-the-art non-LTE modelling techniques. Results: We
measured abundances of individual elements to very high accuracy in HE0437-5439
as well as in two reference stars, from the LMC and the solar neighbourhood.
The abundance pattern is not consistent at all with that observed in stars near
the GC, ruling our an origin from the GC. However, there is a high degree of
consistency with the LMC abundance pattern. Our abundance results cannot rule
out an origin in the outskirts of the Galactic disk. However, we find the life
time of HE0437-5439 to be more than 3 times shorter than the time of flight to
the edge of the disk, rendering a Galactic origin unlikely. Conclusions: Only
one SMBH is known to be present in Galaxy and none in the LMC. Hence the
exclusion of an GC origin challenges the SMBH paradigm. We conclude that there
must be other mechanism(s) to accelerate stars to hyper-velocity speed than the
SMBH. We draw attention to dynamical ejection from dense massive clusters, that
has recently been proposed by Gvaramadze et al. (2008).
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:20:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Przybilla",
"N.",
""
],
[
"Nieva",
"M. F.",
""
],
[
"Heber",
"U.",
""
],
[
"Firnstein",
"M.",
""
],
[
"Butler",
"K.",
""
],
[
"Napiwotzki",
"R.",
""
],
[
"Edelmann",
"H.",
""
]
] | [
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] |
801.4457 | Chethan Gowdigere | R. Fareghbal, C. N. Gowdigere, A. E. Mosaffa, M. M. Sheikh-Jabbari | Nearing Extremal Intersecting Giants and New Decoupled Sectors in N = 4
SYM | 44 pages, references added, minor changes | JHEP 0808:070,2008 | 10.1088/1126-6708/2008/08/070 | IPM/P-2008/005, SUT-P-08-1a, IC/2008/003 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study near-horizon limits of near-extremal charged black hole solutions to
five-dimensional $U(1)^3$ gauged supergravity carrying two charges, extending
the recent work of Balasubramanian et.al. We show that there are two
near-horizon decoupling limits for the near-extremal black holes, one
corresponding to the near-BPS case and the other for the far from BPS case.
Both of these limits are only defined on the 10d IIB uplift of the 5d black
holes, resulting in a decoupled geometry with a six-dimensional part (conformal
to) a rotating BTZ X $S^3$. We study various aspects of these decoupling limits
both from the gravity side and the dual field theory side. For the latter we
argue that there should be two different, but equivalent, dual gauge theory
descriptions, one in terms of the 2d CFT's dual to the rotating BTZ and the
other as certain large R-charge sectors of d=4,N =4 U(N) SYM theory. We discuss
new BMN-type sectors of the N=4 SYM in the $N\to\infty$ limit in which the
engineering dimensions scale as $N^{3/2}$ (for the near-BPS case) and as $N^2$
(for the far from BPS case).
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:22:41 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Apr 2008 13:43:25 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Jul 2008 13:24:16 GMT"
}
] | 2009-10-07T00:00:00 | [
[
"Fareghbal",
"R.",
""
],
[
"Gowdigere",
"C. N.",
""
],
[
"Mosaffa",
"A. E.",
""
],
[
"Sheikh-Jabbari",
"M. M.",
""
]
] | [
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] |
801.4458 | Marcel Griesemer | Marcel Griesemer and David Hasler | Analytic Perturbation Theory and Renormalization Analysis of Matter
Coupled to Quantized Radiation | 47 pages | null | 10.1007/s00023-009-0417-9 | null | math-ph math.MP math.SP | null | For a large class of quantum mechanical models of matter and radiation we
develop an analytic perturbation theory for non-degenerate ground states. This
theory is applicable, for example, to models of matter with static nuclei and
non-relativistic electrons that are coupled to the UV-cutoff quantized
radiation field in the dipole approximation. If the lowest point of the energy
spectrum is a non-degenerate eigenvalue of the Hamiltonian, we show that this
eigenvalue is an analytic function of the nuclear coordinates and of
$\alpha^{3/2}$, $\alpha$ being the fine structure constant. A suitably chosen
ground state vector depends analytically on $\alpha^{3/2}$ and it is twice
continuously differentiable with respect to the nuclear coordinates.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:47:18 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Griesemer",
"Marcel",
""
],
[
"Hasler",
"David",
""
]
] | [
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] |
801.4459 | Samir Siksek | Y. Bugeaud, M. Mignotte, S. Siksek, M. Stoll and Sz. Tengely | Integral Points on Hyperelliptic Curves | null | Algebra & Number Theory 2 (2008), No. 8, 859-885. | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a completely explicit upper bound for integral points on (standard)
affine models of hyperelliptic curves, provided we know at least one rational
point and a Mordell-Weil basis of the Jacobian. We also explain a powerful
refinement of the Mordell--Weil sieve which, combined with the upper bound, is
capable of determining all the integral points. Our method is illustrated by
determining the integral points on a two genus 2 hyperelliptic curves with
Mordell--Weil Jacobian ranks of 3 and 6.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 09:48:23 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jul 2008 08:42:50 GMT"
},
{
"version": "v3",
"created": "Thu, 4 Sep 2008 10:51:58 GMT"
},
{
"version": "v4",
"created": "Tue, 16 Mar 2010 14:43:23 GMT"
}
] | 2010-03-17T00:00:00 | [
[
"Bugeaud",
"Y.",
""
],
[
"Mignotte",
"M.",
""
],
[
"Siksek",
"S.",
""
],
[
"Stoll",
"M.",
""
],
[
"Tengely",
"Sz.",
""
]
] | [
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] |
801.446 | Yuri A. Kordyukov | Bernard Helffer, Yuri A. Kordyukov | Spectral gaps for periodic Schr\"odinger operators with hypersurface
magnetic wells | 16 pages | null | null | null | math.SP math-ph math.MP | null | We consider a periodic magnetic Schr\"odinger operator on a noncompact
Riemannian manifold $M$ such that $H^1(M, \RR)=0$ endowed with a properly
discontinuous cocompact isometric action of a discrete group. We assume that
there is no electric field and that the magnetic field has a periodic set of
compact magnetic wells. We review a general scheme of a proof of existence of
an arbitrary large number of gaps in the spectrum of such an operator in the
semiclassical limit, which was suggested in our previous paper, and some
applications of this scheme. Then we apply these methods to establish similar
results in the case when the wells have regular hypersurface pieces.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:02:05 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Helffer",
"Bernard",
""
],
[
"Kordyukov",
"Yuri A.",
""
]
] | [
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] |
801.4461 | C.C. Alan Fung | C. C. Alan Fung, K. Y. Michael Wong, Si Wu | Dynamics of Neural Networks with Continuous Attractors | 6 pages, 7 figures with 4 captions | EPL (2008) 84: 18002 | 10.1209/0295-5075/84/18002 | null | cond-mat.dis-nn q-bio.NC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the dynamics of continuous attractor neural networks (CANNs).
Due to the translational invariance of their neuronal interactions, CANNs can
hold a continuous family of stationary states. We systematically explore how
their neutral stability facilitates the tracking performance of a CANN, which
is believed to have wide applications in brain functions. We develop a
perturbative approach that utilizes the dominant movement of the network
stationary states in the state space. We quantify the distortions of the bump
shape during tracking, and study their effects on the tracking performance.
Results are obtained on the maximum speed for a moving stimulus to be
trackable, and the reaction time to catch up an abrupt change in stimulus.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:15:35 GMT"
},
{
"version": "v2",
"created": "Sat, 31 Jan 2015 15:29:22 GMT"
}
] | 2015-02-03T00:00:00 | [
[
"Fung",
"C. C. Alan",
""
],
[
"Wong",
"K. Y. Michael",
""
],
[
"Wu",
"Si",
""
]
] | [
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] |
801.4462 | Philip Evans | P. A. Evans, A.P. Beardmore, M.R. Goad, J.P. Osborne (U. Leicester),
D.N. Burrows (Penn State University), and N. Gehrels (NASA/GSFC) | Improving Swift-XRT positions of GRBs | 4 pages, to appear in the proceedings of "Gamma Ray Bursts 2007,
Santa Fe" | AIP Conf.Proc.1000:539-542,2008 | 10.1063/1.2943526 | null | astro-ph | null | Since GRBs fade rapidly, it is important to publish accurate, precise
positions at early times. For Swift-detected bursts, the best promptly
available position is most commonly the X-ray Telescope (XRT) position. We
present two processes, developed by the Swift team at Leicester, which are now
routinely used to improve the precision and accuracy of the XRT positions
reported by the Swift team. Both methods, which are fully automated, make use
of a PSF-fitting approach which accounts for the bad columns on the CCD. The
first method yields positions with 90% error radii <4.4" 90% of the time,
within 10--20 minutes of the trigger. The second method astrometrically
corrects the position using UVOT field stars and the known mapping between the
XRT and UVOT detectors, yielding enhanced positions with 90% error radii of
<2.8" 90% of the time, usually ~2 hours after the trigger.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:07:56 GMT"
}
] | 2010-03-19T00:00:00 | [
[
"Evans",
"P. A.",
"",
"U. Leicester"
],
[
"Beardmore",
"A. P.",
"",
"U. Leicester"
],
[
"Goad",
"M. R.",
"",
"U. Leicester"
],
[
"Osborne",
"J. P.",
"",
"U. Leicester"
],
[
"Burrows",
"D. N.",
"",
"Penn State University"
],
[
"Gehrels",
"N.",
"",
"NASA/GSFC"
]
] | [
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] |
801.4463 | Romuald A. Janik | Michal P. Heller, Romuald A. Janik and Tomasz Lukowski | A new derivation of Luscher F-term and fluctuations around the giant
magnon | 15 pages, no figures; v2: added assumption on diagonal scattering and
a section on generalizations; v3: minor changes, version accepted for
publication in JHEP | JHEP 0806:036,2008 | 10.1088/1126-6708/2008/06/036 | null | hep-th | null | In this paper we give a new derivation of the generalized Luscher F-term
formula from a summation over quadratic fluctuations around a given soliton.
The result is very general providing that S-matrix is diagonal and is valid for
arbitrary dispersion relation. We then apply this formalism to compute the
leading finite size corrections to the giant magnon dispersion relation coming
from quantum fluctuations.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:15:36 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Mar 2008 18:58:43 GMT"
},
{
"version": "v3",
"created": "Fri, 23 May 2008 16:23:52 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Heller",
"Michal P.",
""
],
[
"Janik",
"Romuald A.",
""
],
[
"Lukowski",
"Tomasz",
""
]
] | [
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] |
801.4464 | Bruno Andreotti | Jacco H. Snoeijer and Bruno Andreotti | A microscopic view on contact angle selection | 12 pages, 6 figures | null | 10.1063/1.2913675 | null | physics.flu-dyn | null | We discuss the equilibrium condition for a liquid that partially wets a solid
on the level of intermolecular forces. Using a mean field continuum
description, we generalize the capillary pressure from variation of the free
energy and show at what length scale the equilibrium contact angle is selected.
After recovering Young's law for homogeneous substrates, it is shown how
hysteresis of the contact angle can be incorporated in a self-consistent
fashion. In all cases the liquid-vapor interface takes a nontrivial shape,
which is compared to models using a disjoining pressure.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:18:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Snoeijer",
"Jacco H.",
""
],
[
"Andreotti",
"Bruno",
""
]
] | [
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] |
801.4465 | Patricia Whitelock | Patricia A. Whitelock, Michael W. Feast and Floor van Leeuwen | AGB Variables and the Mira Period-Luminosity Relation | 15 pages, 3 figures, accepted for MNRAS | Mon.Not.Roy.Astron.Soc.386:313-323,2008 | 10.1111/j.1365-2966.2008.13032.x | null | astro-ph | null | Published data for large amplitude asymptotic giant branch variables in the
Large Magellanic Cloud are re-analysed to establish the constants for an
infrared (K) period-luminosity relation of the form: Mk=rho[log P-2.38] +
delta. A slope of rho=-3.51+/-0.20 and a zero point of delta=-7.15+/-0.06 are
found for oxygen-rich Miras (if a distance modulus of 18.39+/-0.05 is used for
the LMC). Assuming this slope is applicable to Galactic Miras we discuss the
zero-point for these stars using the revised Hipparcos parallaxes together with
published VLBI parallaxes for OH Masers and Miras in Globular Clusters. These
result in a mean zero-point of delta=-7.25+/-0.07 for O-rich Galactic Miras.
The zero-point for Miras in the Galactic Bulge is not significantly different
from this value.
Carbon-rich stars are also discussed and provide results that are consistent
with the above numbers, but with higher uncertainties. Within the uncertainties
there is no evidence for a significant difference between the period-luminosity
relation zero-points for systems with different metallicity.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:34:43 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Whitelock",
"Patricia A.",
""
],
[
"Feast",
"Michael W.",
""
],
[
"van Leeuwen",
"Floor",
""
]
] | [
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] |
801.4466 | Thomas Gasenzer | Alexander Bransch\"adel and Thomas Gasenzer | 2PI nonequilibrium versus transport equations for an ultracold Bose gas | 24 pages, 7 figures. References added | J.Phys.B41:135302,2008 | 10.1088/0953-4075/41/13/135302 | HD-THEP-08-02 | cond-mat.other hep-ph | null | The far-from-equilibrium dynamics of an ultracold, one-dimensional Bose gas
is studied. The focus is set on the comparison between the solutions of fully
dynamical evolution equations derived from the 2PI effective action and their
corresponding kinetic approximation in the form of Boltzmann-type transport
equations. It is shown that during the time evolution of the gas a kinetic
description which includes non-Markovian memory effects in a gradient expansion
becomes valid. The time scale at which this occurs is shown to exceed
significantly the time scale at which the system's evolution enters a
near-equilibrium drift period where a fluctuation dissipation relation is found
to hold and which would seem to be predestined for the kinetic approximation.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 11:39:53 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 10:58:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Branschädel",
"Alexander",
""
],
[
"Gasenzer",
"Thomas",
""
]
] | [
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] |
801.4467 | Gregory Lehaut | Gregory Lehaut, Francesca Gullminelli and Olivier Lopez | Isospin effects in the thermodynamics of finite nuclei | Proceeding of the International Workshop on Multifragmentation and
related topics, November 2007 4-7th, Caen France | null | null | null | nucl-th | null | It has been proposed that multifragmentation can be related to the liquid-gas
phase transition of nuclear matter. We study the statistical properties of
finite nuclear matter near the phase transition with the help of a Lattice Gas
Model (LGM). The original version of LGM with only one type of charge-neutral
particles is well known to feature the properties of the liquid-gas phase
transition. In this contribution, we address the effect of Coulomb and isospin
dependence interaction for the finite nuclei transition, and study the symmetry
energy properties of finite temperature systems.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:50:40 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Lehaut",
"Gregory",
""
],
[
"Gullminelli",
"Francesca",
""
],
[
"Lopez",
"Olivier",
""
]
] | [
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] |
801.4468 | Nikolai Chugai | N. N. Chugai | Circumstellar Na I and Ca II lines of type Ia supernovae in symbiotic
scenario | 10 pages, 6 figures, Astronomy Letters (accepted) | null | 10.1134/S1063773708060030 | null | astro-ph | null | Formation of circumstellar lines of Na I and Ca II in type Ia supernovae is
studied for the case, when supernova explodes in a binary system with a red
giant. The model suggests a spherically-symmetric wind and takes into account
ionization and heating of the wind by X-rays from the shock wave and by
gamma-quanta of ^{56}Ni radioactive decay. For the wind density typical of the
red giant the expected optical depth of the wind in Na I lines turnes out too
low (\tau<0.001}) to detect the absorption. For the same wind densities the
predicted optical depth of Ca II 3934 \AA is sufficient for the detection
(\tau>0.1). I conclude that the absorption lines detected in SN 2006X cannot
form in the red giant wind; they are rather related to clouds at distances
larger than the dust evaporation radius (r>10^{17} cm). From the absence in SN
2006X of Ca II absorption lines not related with the similar Na I components I
derive the upper limit of the mass loss rate by the wind with velocity u:
\dot{M}<10^{-8}(u/10 km/s) M_{\odot} yr^{-1}.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:52:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chugai",
"N. N.",
""
]
] | [
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801.4469 | Michio Naito | O. Matsumoto, A. Utsuki, A. Tsukada, H. Yamamoto, T. Manabe, M. Naito | Superconductivity in undoped T'-RE2CuO4 with Tc over 30 K | 17 pages, 5 figures, International Symposium on Superconductivity
2007 | null | 10.1016/j.physc.2008.05.019 | null | cond-mat.supr-con | null | In this article, we report the superconductivity in T'-RE2CuO4 (RE = Pr, Nd,
Sm, Eu, and Gd), which have been for a long time believed as a Mott insulator.
Our discovery was achieved by using metal-organic decomposition (MOD), an
inexpensive and easy-to-implement thin-film process. The keys to prepare the
superconducting films are firing with low partial-pressure of oxygen and
reduction at low temperatures. The highest Tc of undoped T'-RE2CuO4 is over 30
K, substantially higher than "electron-doped" analogs. Remarkably, Gd2CuO4,
even the derivatives of which have not shown superconductivity so far, gets
superconducting with Tconset as high as 20 K. The implication of our discovery
is briefly discussed.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:59:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Matsumoto",
"O.",
""
],
[
"Utsuki",
"A.",
""
],
[
"Tsukada",
"A.",
""
],
[
"Yamamoto",
"H.",
""
],
[
"Manabe",
"T.",
""
],
[
"Naito",
"M.",
""
]
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801.447 | Babatunde Okunoye | Babatunde O. Okunoye | Testing for Subcellular Randomness | 18 pages,3 figures | null | null | null | physics.gen-ph | null | Statistical tests were conducted on 1,000 numbers generated from the genome
of Bacteriophage T4, obtained from GenBank with accession number AF158101.The
numbers passed the non-parametric, distribution-free tests.Deoxyribonucleic
acid was discovered to be a random number generator, existent in nature.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 10:59:46 GMT"
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] | 2008-01-30T00:00:00 | [
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801.4471 | Hrvoje Nikolic | H. Nikolic | Unparticle as a particle with arbitrary mass | 5 pages, revised, to appear in Mod. Phys. Lett. A | Mod.Phys.Lett.A23:2645-2649,2008 | 10.1142/S021773230802820X | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The unparticle field operator can be expanded in terms of creation and
destruction operators corresponding to particles with a continuous mass
spectrum. Hence, when the 4-momentum of an unparticle is measured, then the
unparticle manifests as an ordinary particle with a definite (but arbitrary)
mass.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 11:05:57 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 11:00:19 GMT"
},
{
"version": "v3",
"created": "Tue, 1 Jul 2008 09:38:09 GMT"
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801.4472 | Riccardo Franco | Riccardo Franco | Belief revision in quantum decision theory: gambler's and hot hand
fallacies | null | null | null | null | physics.gen-ph | null | In the present article we introduce a quantum mechanism which is able to
describe the creation of correlations in the evaluation of random independent
events: such correlations, known as positive and negative recency, correspond
respectively to the hot hand's and to the gambler's fallacies. Thus we propose
a description of these effects in terms of qubits, which may become entangled,
forming a system which can not be described completely only in terms of its
constituents. We show that such formalism is able to describe and interpret the
experimental results, thus providing a general and unifying framework for the
cognitive heuristics.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 11:19:34 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Franco",
"Riccardo",
""
]
] | [
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