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801.2273 | Hans Moritz G\"unther | H. M. G\"unther and J. H. M. M. Schmitt | Where are the hot ion lines in classical T Tauri stars formed? | accepted by A&A Replacement done after language editing | null | 10.1051/0004-6361:20078674 | null | astro-ph | null | Classical T Tauri stars show a plethora of in- and outflow signatures in a
variety of wavelengths bands. In order to constrain gas velocities and
temperatures we analyse the emission in the hot ion lines. We use all available
archival FUSE spectra of CTTS to measure the line widths, fluxes and shifts and
complement this sample with HST/GHRS and HST/STIS data. We present theoretical
estimates for temperatures reached in possible emission models like jets,
winds, disks and accretion funnels and look for correlations with X-ray lines
and absorption properties. We find line shifts in the range from -170 km/s and
+100 km/s. Most linewidths exceed the stellar rotational broadening. Those CTTS
with blue-shifted lines also show excess absorption in X-rays. CTTS single out
from MS stars by their large ratio of the O VII to O VI luminosities. No single
emission mechanism can be found for all objects. The properties of those stars
with blue-shifted lines are compatible with an origin in a shock-heated
dust-depleted outflow.
| [
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{
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] | 2009-11-13T00:00:00 | [
[
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""
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""
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801.2274 | Chihin Lau | Chihin Lau | Holomorphic maps from rational homogeneous spaces onto projective
manifolds | null | null | null | null | math.AG | null | Answering a problem raised by Lazarsfeld, Hwang and Mok proved that a
surjective holomorphic map from a rational homogeneous space of Picard number 1
onto projective manifold different from projective space must be a
biholomorphism. THe aim of this paper is to generalized this result to
irreducible rational homogeneous space of higher Picard number.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 12:21:35 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Jan 2008 13:09:24 GMT"
}
] | 2008-01-21T00:00:00 | [
[
"Lau",
"Chihin",
""
]
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801.2275 | Wendy L. Freedman | Wendy L. Freedman, Barry F. Madore, Jane Rigby, S. E. Persson and
Laura Sturch | The Cepheid Period-Luminosity Relation at Mid-Infrared Wavelengths: I.
First-Epoch LMC Data | 19 pages, 4 figures, 1 table, Accepted for publication in the
Astrophysical Journal | null | 10.1086/586701 | null | astro-ph | null | We present the first mid-infrared Period-Luminosity (PL) relations for Large
Magellanic Cloud (LMC) Cepheids. Single-epoch observations of 70 Cepheids were
extracted from Spitzer IRAC observations at 3.6, 4.5, 5.8 and 8.0 microns,
serendipitously obtained during the SAGE (Surveying the Agents of a Galaxy's
Evolution) imaging survey of the LMC. All four mid-infrared PL relations have
nearly identical slopes over the period range 6 - 88 days, with a small scatter
of only +/-0.16 mag independent of period for all four of these wavelengths. We
emphasize that differential reddening is not contributing significantly to the
observed scatter, given the nearly two orders of magnitude reduced sensitivity
of the mid-IR to extinction compared to the optical. Future observations,
filling in the light curves for these Cepheids, should noticeably reduce the
residual scatter. These attributes alone suggest that mid-infrared PL relations
will provide a practical means of significantly improving the accuracy of
Cepheid distances to nearby galaxies.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 12:26:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Freedman",
"Wendy L.",
""
],
[
"Madore",
"Barry F.",
""
],
[
"Rigby",
"Jane",
""
],
[
"Persson",
"S. E.",
""
],
[
"Sturch",
"Laura",
""
]
] | [
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] |
801.2276 | Hideaki Mouri | H. Mouri, A. Hori | Vortex Tubes in Turbulence Velocity Fields at High Reynolds Numbers | 13 pages, accepted by Fluid Dynamics Research (see
http://www.sciencedirect.com/science/journal/01695983) | FDR, 41, 021402 [2009] | 10.1088/0169-5983/41/2/021402 | null | physics.flu-dyn | null | The elementary structures of turbulence, i.e., vortex tubes, are studied
using velocity data obtained in laboratory experiments for boundary layers and
duct flows at microscale Reynolds numbers 332-1934. While past experimental
studies focused on intense vortex tubes, the present study focuses on all
vortex tubes with various intensities. We obtain the mean velocity profile. The
radius scales with the Kolmogorov length. The circulation velocity scales with
the Kolmogorov velocity, in contrast to the case of intense vortex tubes alone
where the circulation velocity scales with the rms velocity fluctuation. Since
these scaling laws are independent of the configuration for turbulence
production, they appear to be universal at high Reynolds numbers.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 12:41:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mouri",
"H.",
""
],
[
"Hori",
"A.",
""
]
] | [
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] |
801.2277 | Andrea Pastorello | A. Pastorello, S. Mattila, L. Zampieri, M. Della Valle, S. J. Smartt,
S. Valenti, I. Agnoletto, S. Benetti, C. R. Benn, D. Branch, E. Cappellaro,
M. Dennefeld, J. J. Eldridge, A. Gal-Yam, A. Harutyunyan, I. Hunter, H.
Kjeldsen, Y. Lipkin, P. A. Mazzali, P. Milne, H. Navasardyan, E. O. Ofek, E.
Pian, O. Shemmer, S. Spiro, R. A. Stathakis, S. Taubenberger, M. Turatto, H.
Yamaoka | Massive stars exploding in a He-rich circumstellar medium. I. Type Ibn
(SN 2006jc-like) events | 17 pages including 12 figures and 4 tables. Slightly revised version,
conclusions unchanged, 1 figure added. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13602.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new spectroscopic and photometric data of the type Ibn supernovae
2006jc, 2000er and 2002ao. We discuss the general properties of this recently
proposed supernova family, which also includes SN 1999cq. The early-time
monitoring of SN 2000er traces the evolution of this class of objects during
the first few days after the shock breakout. An overall similarity in the
photometric and spectroscopic evolution is found among the members of this
group, which would be unexpected if the energy in these core-collapse events
was dominated by the interaction between supernova ejecta and circumstellar
medium. Type Ibn supernovae appear to be rather normal type Ib/c supernova
explosions which occur within a He-rich circumstellar environment. SNe Ibn are
therefore likely produced by the explosion of Wolf-Rayet progenitors still
embedded in the He-rich material lost by the star in recent mass-loss episodes,
which resemble known luminous blue variable eruptions. The evolved Wolf-Rayet
star could either result from the evolution of a very massive star or be the
more evolved member of a massive binary system. We also suggest that there are
a number of arguments in favour of a type Ibn classification for the historical
SN 1885A (S-Andromedae), previously considered as an anomalous type Ia event
with some resemblance to SN 1991bg.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:37:06 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jun 2008 16:24:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pastorello",
"A.",
""
],
[
"Mattila",
"S.",
""
],
[
"Zampieri",
"L.",
""
],
[
"Della Valle",
"M.",
""
],
[
"Smartt",
"S. J.",
""
],
[
"Valenti",
"S.",
""
],
[
"Agnoletto",
"I.",
""
],
[
"Benetti",
"S.",
""
],
[
"Benn",
"C. R.",
""
],
[
"Branch",
"D.",
""
],
[
"Cappellaro",
"E.",
""
],
[
"Dennefeld",
"M.",
""
],
[
"Eldridge",
"J. J.",
""
],
[
"Gal-Yam",
"A.",
""
],
[
"Harutyunyan",
"A.",
""
],
[
"Hunter",
"I.",
""
],
[
"Kjeldsen",
"H.",
""
],
[
"Lipkin",
"Y.",
""
],
[
"Mazzali",
"P. A.",
""
],
[
"Milne",
"P.",
""
],
[
"Navasardyan",
"H.",
""
],
[
"Ofek",
"E. O.",
""
],
[
"Pian",
"E.",
""
],
[
"Shemmer",
"O.",
""
],
[
"Spiro",
"S.",
""
],
[
"Stathakis",
"R. A.",
""
],
[
"Taubenberger",
"S.",
""
],
[
"Turatto",
"M.",
""
],
[
"Yamaoka",
"H.",
""
]
] | [
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] |
801.2278 | Andrea Pastorello | A. Pastorello, R. M. Quimby, S. J. Smartt, S. Mattila, H. Navasardyan,
R. M. Crockett, N. Elias-Rosa, P. Mondol, J. C. Wheeler, D. Young | Massive stars exploding in a He-rich circumstellar medium. II. The
transitional case of SN 2005la | 9 pages, including 6 figures and 4 tables. Minor corrections, 1
figure added. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13603.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present photometric and spectroscopic data of the peculiar SN 2005la, an
object which shows an optical light curve with some luminosity fluctuations and
spectra with comparably strong narrow hydrogen and helium lines, probably of
circumstellar nature. The increasing full-width-half-maximum velocity of these
lines is indicative of an acceleration of the circumstellar material. SN 2005la
exhibits hybrid properties, sharing some similarities with both type IIn
supernovae and 2006jc-like (type Ibn) events. We propose that the progenitor of
SN 2005la was a very young Wolf-Rayet (WN-type) star which experimented mass
ejection episodes shortly before core collapse.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:29:30 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jun 2008 16:24:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pastorello",
"A.",
""
],
[
"Quimby",
"R. M.",
""
],
[
"Smartt",
"S. J.",
""
],
[
"Mattila",
"S.",
""
],
[
"Navasardyan",
"H.",
""
],
[
"Crockett",
"R. M.",
""
],
[
"Elias-Rosa",
"N.",
""
],
[
"Mondol",
"P.",
""
],
[
"Wheeler",
"J. C.",
""
],
[
"Young",
"D.",
""
]
] | [
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] |
801.2279 | Hernando Quevedo | J.L. Alvarez, H. Quevedo and A. Sanchez | Unified geometric description of black hole thermodynamics | null | Phys.Rev.D77:084004,2008 | 10.1103/PhysRevD.77.084004 | null | gr-qc hep-th | null | In the space of thermodynamic equilibrium states we introduce a Legendre
invariant metric which contains all the information about the thermodynamics of
black holes. The curvature of this thermodynamic metric becomes singular at
those points where, according to the analysis of the heat capacities, phase
transitions occur. This result is valid for the Kerr-Newman black hole and all
its special cases and, therefore, provides a unified description of black hole
phase transitions in terms of curvature singularities.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 12:34:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Alvarez",
"J. L.",
""
],
[
"Quevedo",
"H.",
""
],
[
"Sanchez",
"A.",
""
]
] | [
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] |
801.228 | Noboru Fukushima | Noboru Fukushima | Grand canonical Gutzwiller approximation for magnetic inhomogeneous
systems | 18 pages. 8 figures added. Sec.II B, Sec.III F G H, Sec.IV G mainly
revised | Phys. Rev. B 78, 115105 (2008) | 10.1103/PhysRevB.78.115105 | null | cond-mat.str-el cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Gutzwiller approximation (GA) for Gutzwiller-projected grand canonical
wave functions with fugacity factors is investigated in detail. Our systems in
general contain inhomogeneity and local magnetic moments. In deriving
renormalization formulae, we also derive or estimate terms of higher powers of
intersite contractions neglected in the conventional GA. We examine several
different constraints, i.e., local/global spin-dependent/independent
particle-number conservation. Out of the four, the local spin-dependent
constraint seems the most promising at present. An improved GA derived from it
agrees with the variational Monte Carlo method better than the conventional GA
does. The corrections to the conventional GA can be interpreted as two-site
correlation including the phase difference of configurations. Furthermore,
projected quasi-particle excited states are orthogonal to each other within the
GA. Using these states, spectral weights are calculated. We show that asymmetry
between electron addition and removal spectra can appear by taking into account
the higher powers of the intersite contractions in the case of the d-wave
superconductors and the Fermi sea; the addition is smaller than the removal.
However, the asymmetry is quite weak especially near the Fermi level. In
contrast, projected s-wave superconductors can have the opposite asymmetry
(addition larger than removal) especially near the Fermi level. In addition,
formulae from the other three constraints are also derived, which may be useful
depending on purposes.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 12:49:04 GMT"
},
{
"version": "v2",
"created": "Sat, 5 Jul 2008 09:26:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fukushima",
"Noboru",
""
]
] | [
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801.2281 | Longhetti Marcella | Marcella Longhetti, Paolo Saracco, Arturo Mignano (INAF - Osservatorio
di Brera) | Testing different stellar mass estimators at 1<z<2 | 4 pages, 2 figures. To appear in the proceedings of `A Century of
Cosmology', S. Servolo, August 2007, to be published in Il Nuovo Cimento | Nuovo Cim.B122:1267-1271,2007 | 10.1393/ncb/i2008-10471-4 | null | astro-ph | null | Physical parameters of galaxies (as luminosity, stellar mass, age) are often
derived by means of the model templates which best fit their
spectro-photometric data. We have performed a quantitative test aimed at
exploring the ability of this procedure in recovering the physical parameters
of early-type galaxies at 1<z<2. A wide range of simulated SEDs, reproducing
those of early-type galaxies at 1<z<2 with assigned age and mass, are used to
build mock photometric catalogs with wavelength coverage and photometric
uncertainties similar to those of two topical surveys (i.e. VVDS and GOODS).
The best fitting analysis of the simulated photometric data allows to study the
differences among the recovered parameters and the input ones. Results indicate
that the stellar masses measured by means of optical bands are affected by
larger uncertainties with respect to those obtained from near-IR bands, and
they frequently underestimate the real values. The M/L ratio in the V band
results strongly underestimated, even when derived from the recently proposed
recipe based on rest-frame optical colours (e.g. (B-V)).
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:14:47 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Longhetti",
"Marcella",
"",
"INAF - Osservatorio\n di Brera"
],
[
"Saracco",
"Paolo",
"",
"INAF - Osservatorio\n di Brera"
],
[
"Mignano",
"Arturo",
"",
"INAF - Osservatorio\n di Brera"
]
] | [
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] |
801.2282 | Tobias Beck | T. Beck | Formal Desingularization of Surfaces - The Jung Method Revisited - | 33 pages, 2 figures | null | null | Ricam Report 2007-31 | math.AG | null | In this paper we propose the concept of formal desingularizations as a
substitute for the resolution of algebraic varieties. Though a usual resolution
of algebraic varieties provides more information on the structure of
singularities there is evidence that the weaker concept is enough for many
computational purposes. We give a detailed study of the Jung method and show
how it facilitates an efficient computation of formal desingularizations for
projective surfaces over a field of characteristic zero, not necessarily
algebraically closed. The paper includes a generalization of Duval's Theorem on
rational Puiseux parametrizations to the multivariate case and a detailed
description of a system for multivariate algebraic power series computations.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 12:52:50 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Beck",
"T.",
""
]
] | [
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] |
801.2283 | Kristiaan Kuit | K.H. Kuit, J.R. Kirtley, W. van der Veur, C.G. Molenaar, F.J.G.
Roesthuis, A.G.P. Troeman, J.R. Clem, H. Hilgenkamp, H. Rogalla and J.
Flokstra | Vortex trapping and expulsion in thin-film YBCO strips | null | null | 10.1103/PhysRevB.77.134504 | null | cond-mat.supr-con | null | A scanning SQUID microscope was used to image vortex trapping as a function
of the magnetic induction during cooling in thin-film YBCO strips for strip
widths W from 2 to 50 um. We found that vortices were excluded from the strips
when the induction Ba was below a critical induction Bc. We present a simple
model for the vortex exclusion process which takes into account the vortex -
antivortex pair production energy as well as the vortex Meissner and
self-energies. This model predicts that the real density n of trapped vortices
is given by n=(Ba-BK)/Phi0 with BK = 1.65Phi0/W^2 and Phi0 = h/2e the
superconducting flux quantum. This prediction is in good agreement with our
experiments on YBCO, as well as with previous experiments on thin-film strips
of niobium. We also report on the positions of the trapped vortices. We found
that at low densities the vortices were trapped in a single row near the
centers of the strips, with the relative intervortex spacing distribution width
decreasing as the vortex density increased, a sign of longitudinal ordering.
The critical induction for two rows forming in the 35 um wide strip was (2.89 +
1.91-0.93)Bc, consistent with a numerical prediction.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:06:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kuit",
"K. H.",
""
],
[
"Kirtley",
"J. R.",
""
],
[
"van der Veur",
"W.",
""
],
[
"Molenaar",
"C. G.",
""
],
[
"Roesthuis",
"F. J. G.",
""
],
[
"Troeman",
"A. G. P.",
""
],
[
"Clem",
"J. R.",
""
],
[
"Hilgenkamp",
"H.",
""
],
[
"Rogalla",
"H.",
""
],
[
"Flokstra",
"J.",
""
]
] | [
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801.2284 | Kettani Omar | Omar Kettani | Le probleme de l'isomorphisme de graphes est dans P | This paper has been withdrawn | null | null | null | cs.DM cs.DS | null | This paper has been withdrawn by the author, due to possible
counter-examples.
| [
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] | 2008-01-19T00:00:00 | [
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801.2285 | Frank Breitling | F. Breitling, T. Granzer, H. Enke | Grid Integration of Robotic Telescopes | 4 pages, 5 Figures, refereed proceedings of "Hot-wiring the Transient
Universe", June 2007 (Tucson); version 2 including latex geometry package as
recommended by arXiv and minor changes as requested by AN except removal of
two figures | Astron.Nachr.329:343-346,2008 | 10.1002/asna.200710931 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Robotic telescopes and grid technology have made significant progress in
recent years. Both innovations offer important advantages over conventional
technologies, particularly in combination with one another. Here, we introduce
robotic telescopes used by the Astrophysical Institute Potsdam as ideal
instruments for building a robotic telescope network. We also discuss the grid
architecture and protocols facilitating the network integration that is being
developed by the German AstroGrid-D project. Finally, we present three user
interfaces employed for this purpose.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:09:23 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Mar 2009 15:21:40 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Breitling",
"F.",
""
],
[
"Granzer",
"T.",
""
],
[
"Enke",
"H.",
""
]
] | [
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801.2286 | Tobias Beck | T. Beck, J. Schicho | Adjoint Computation for Hypersurfaces Using Formal Desingularizations | 10 pages | null | null | Ricam Report 2008-2 | math.AG | null | We show how to use formal desingularizations (defined earlier by the first
author) in order to compute the global sections (also called adjoints) of
twisted pluricanonical sheaves. These sections define maps that play an
important role in the birational classification of schemes.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:35:20 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Beck",
"T.",
""
],
[
"Schicho",
"J.",
""
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] |
801.2287 | Ralph Neuhaeuser | Ralph Neuhaeuser, Markus Mugrauer, Andreas Seifahrt, Tobias Schmidt
(AIU Jena), Nikolaus Vogt (Valparaiso) | Astrometric and photometric monitoring of GQ Lup and its sub-stellar
companion | A&A in press | null | 10.1051/0004-6361:20078493 | null | astro-ph | null | Neuhaeuser et al. (2005) presented direct imaging evidence for a sub-stellar
companion to the young T Tauri star GQ Lup. Common proper motion was highly
significant, but no orbital motion was detected. Faint luminosity, low gravity,
and a late-M/early-L spectral type indicated that the companion is either a
planet or a brown dwarf. We have monitored GQ Lup and its companion in order to
detect orbital and parallactic motion and variability in its brightness. We
also search for closer and fainter companions. We have taken six more images
with the VLT Adaptive Optics instrument NACO from May 2005 to Feb 2007, always
with the same calibration binary from Hipparcos for both astrometric and
photometric calibration. By adding up all the images taken so far, we search
for additional companions. The position of GQ Lup A and its companion compared
to a nearby non-moving background object varies as expected for parallactic
motion by about one pixel (2 \pi with parallax \pi). We could not find evidence
for variability of the GQ Lup companion in the K-band (standard deviation being
\pm 0.08 mag), which may be due to large error bars. No additional companions
are found with deep imaging. There is now exceedingly high significance for
common proper motion of GQ Lup A and its companion. In addition, we see for the
first time an indication for orbital motion (about 2 to 3 mas/yr decrease in
separation, but no significant change in the position angle), consistent with a
near edge-on or highly eccentric orbit. We measured the parallax for GQ Lup A
to be \pi = 6.4 \pm 1.9 mas (i.e. 156 \pm 50 pc) and for the GQ Lup companion
to be 7.2 \pm 2.1 mas (i.e. 139 \pm 45 pc), both consistent with being in the
Lupus I cloud and bound to each other.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:11:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Neuhaeuser",
"Ralph",
"",
"AIU Jena"
],
[
"Mugrauer",
"Markus",
"",
"AIU Jena"
],
[
"Seifahrt",
"Andreas",
"",
"AIU Jena"
],
[
"Schmidt",
"Tobias",
"",
"AIU Jena"
],
[
"Vogt",
"Nikolaus",
"",
"Valparaiso"
]
] | [
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] |
801.2288 | A. D. Polosa | G. 't Hooft, G. Isidori, L. Maiani, A.D. Polosa, V. Riquer | A Theory of Scalar Mesons | 10 pages, 2 figures. References added. Presentation improved.
Unchanged in substance. To appear in Phys Lett B | Phys.Lett.B662:424-430,2008 | 10.1016/j.physletb.2008.03.036 | null | hep-ph | null | We discuss the effect of the instanton induced, six-fermion effective
Lagrangian on the decays of the lightest scalar mesons in the
diquark--antidiquark picture. This addition allows for a remarkably good
description of light scalar meson decays. The same effective Lagrangian
produces a mixing of the lightest scalars with the positive parity q-qbar
states. Comparing with previous work where the q-qbar mesons are identified
with the nonet at 1200-1700 MeV, we find that the mixing required to fit the
mass spectrum is in good agreement with the instanton coupling obtained from
light scalar decays. A coherent picture of scalar mesons as a mixture of
tetraquark states (dominating in the lightest mesons) and heavy q-qbar states
(dominating in the heavier mesons) emerges.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:12:07 GMT"
},
{
"version": "v2",
"created": "Sun, 23 Mar 2008 18:34:04 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Hooft",
"G. 't",
""
],
[
"Isidori",
"G.",
""
],
[
"Maiani",
"L.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
]
] | [
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] |
801.2289 | Ryozo Tamagaki | Ryozo Tamagaki | Universal Short-Range Repulsion in the Baryon System Originating from
the Confinement --Approach in String-Junction Model-- | 25 pages, 9 figures | Prog.Theor.Phys.119:965-989,2008 | 10.1143/PTP.119.965 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show a way to unifiedly understand the origins of the repulsive core of
baryon-baryon interaction and the universal repulsion of three-baryon
interaction needed to avoid dramatic softening of the equation of state of
neutron stars due to hyperon mixing. For this aim we adopt the string-junction
model which embodies the essential aspects of the confinement in the baryon
system confirmed by recent lattice QCD calculations. Key concept of this study
lies in the recognition that baryonic short-range repulsion appears as the
latent effect implying the energy necessary for full overlap of baryons, for
the confinement to persist at such situation. Numerical results are shown and
related problems are discussed.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:15:00 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jun 2008 02:53:31 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Tamagaki",
"Ryozo",
""
]
] | [
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] |
801.229 | Antonio F. F. Teixeira | F. M. Paiva, A. F. F. Teixeira | Relativeca Dopplera efiko inter du akcelataj korpoj - I | Comments: 11 pages, 8 figures, in Esperanto. English text on request.
Portuguese/Esperanto text at
ftp://ftp2.biblioteca.cbpf.br/pub/apub/2008/nf/nf_zip/nf00108.pdf ; equation
(22) corrected, second paragraph of Conclusion clarified | null | null | CBPF-NF-001/08 | physics.gen-ph | null | We describe the Doppler effect between equally accelerated light source and
observer under the special relativity. The proper accelerations are constant
and parallel. An English version is available by request.
- - - - - - - - - - -
Ni priskribas luman Doppleran efikon inter same akcelataj fonto kaj
observanto ^ce special-relativeco. La propraj akceloj estas konstantaj kaj
paralelaj.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:22:50 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Feb 2008 17:49:09 GMT"
}
] | 2008-02-27T00:00:00 | [
[
"Paiva",
"F. M.",
""
],
[
"Teixeira",
"A. F. F.",
""
]
] | [
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] |
801.2291 | Luca Rossi | Luca Rossi | Liouville type results for periodic and almost periodic linear operators | 27 pages, 1 figure | null | 10.1016/j.anihpc.2009.07.001 | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are concerned with some extensions of the classical Liouville theorem for
bounded harmonic functions to solutions of more general equations. We deal with
entire solutions of periodic and almost periodic parabolic equations including
the elliptic framework as a particular case. We derive a Liouville type result
for periodic operators as a consequence of a result for operators periodic in
just one variable, which is new even in the elliptic case. More precisely, we
show that if $c\leq0$ and $a_{ij}, b_i, c, f$ are periodic in the same
space/time direction, with the same period, then any bounded solution $u$ of
$$\partial_t
u-a_{ij}(x,t)\partial_{ij}u-b_i(x,t)\partial_iu-c(x,t)u=f(x,t),\quad x\in\R^N,\
t\in\R,$$ is periodic in that direction. We then derive the following Liouville
type result: if $c\leq0, f\equiv0$ and $a_{ij}, b_i, c$ are periodic in all the
space/time variables, with the same periods, then the space of bounded
solutions of the above equation has at most dimension one. In the case of the
equation $\partial_t u-Lu=f(x,t)$, with $L$ periodic elliptic operator
independent of $t$, the hypothesis $c\leq0$ can be weaken by requiring that the
periodic principal eigenvalue of $-L$ is nonnegative. Instead, the periodicity
assumption cannot be relaxed, because we explicitly exhibit an almost periodic
function $b$ such that the space of bounded solutions of $u''+b(x)u'=0$ in $\R$
has dimension 2, and it is generated by the constant solution and a non-almost
periodic solution. Next, a sufficient condition for any bounded solution to be
almost periodicis derived. We also treat the case of periodic domains under
either Dirichlet or Robin boundary conditions.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:27:23 GMT"
},
{
"version": "v2",
"created": "Sat, 6 Jun 2009 08:44:17 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Rossi",
"Luca",
""
]
] | [
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] |
801.2292 | Jerome Cayssol | J. Cayssol | Crossed Andreev reflection in a graphene bipolar transistor | 4 pages, 4 figures. Accepted in Physical Review Letters | Phys. Rev. Lett. 100, 147001 (2008) | 10.1103/PhysRevLett.100.147001 | null | cond-mat.mes-hall cond-mat.supr-con | null | We investigate the crossed Andreev reflections between two graphene leads
connected by a narrow superconductor. When the leads are respectively of the
n-and p- type, we find that electron elastic cotunneling and local Andreev
reflection are both eliminated even in the absence of any valley-isospin or
spin polarizations. We further predict oscillations of both diagonal and cross
conductances as a function of the distance between the graphene-superconductor
interfaces.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:30:56 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jan 2008 17:50:15 GMT"
},
{
"version": "v3",
"created": "Thu, 6 Mar 2008 21:38:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cayssol",
"J.",
""
]
] | [
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801.2293 | Izak Snyman | I. Snyman and Y. V. Nazarov | The Keldysh action of a multi-terminal time-dependent scatterer | 13 pages, 2 figures, submitted to PRB | Phys. Rev. B 77, 165118 (2008) | 10.1103/PhysRevB.77.165118 | null | cond-mat.mes-hall | null | We present a derivation of the Keldysh action of a general multi-channel
time-dependent scatterer in the context of the Landauer-B\"uttiker approach.
The action is a convenient building block in the theory of quantum transport.
This action is shown to take a compact form that only involves the scattering
matrix and reservoir Green functions. We derive two special cases of the
general result, one valid when reservoirs are characterized by well-defined
filling factors, the other when the scatterer connects two reservoirs. We
illustrate its use by considering Full Counting Statistics and the Fermi Edge
Singularity.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:32:00 GMT"
}
] | 2013-08-28T00:00:00 | [
[
"Snyman",
"I.",
""
],
[
"Nazarov",
"Y. V.",
""
]
] | [
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] |
801.2294 | Euro Spallucci | Patricio Gaete, Euro Spallucci | Un-particle Effective Action | 13 pages, latex, no figures; typos corrected; presentation improved;
new references added; final version accepted in PLB | Phys.Lett.B661:319-324,2008 | 10.1016/j.physletb.2008.02.036 | null | hep-th gr-qc hep-ph | null | We study un-particle dynamics in the framework of standard quantum field
theory. We obtain the Feynman propagator by supplementing standard quantum
field theory definitions with integration over the mass spectrum. Then we use
this information to construct effective actions for scalar, gauge vector and
gravitational un-particles.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:32:34 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2008 09:24:46 GMT"
},
{
"version": "v3",
"created": "Thu, 21 Feb 2008 12:36:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gaete",
"Patricio",
""
],
[
"Spallucci",
"Euro",
""
]
] | [
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] |
801.2295 | Stanyslav Zakharov | Stanyslav Zakharov and Alexey Kryukov | Ship-induced solitons as a manifestation of critical phenomena | 9 text pages, 4 figures | null | null | null | physics.ao-ph physics.flu-dyn | null | A ship, moving with small acceleration in a reservoir of uniform depth, can
be subjected to a sudden hydrodynamical impact similar to collision with an
underwater rock, and on water surface unusual solitary wave will start running.
The factors responsible for formation of solitons induced by a moving ship are
analyzed. Emphasis is given to a phenomenon observed by John Scott Russell more
170 years ago when a sudden stop of a boat preceded the occurrence of exotic
water dome. In dramatic changes of polemic about the stability and mathematical
description of a solitary wave, the question why "Russell's wave" occurred has
not been raised, though attempts its recreation invariably suffered failure. In
our report the conditions disclosing the principle of the famous event as a
critical phenomenon are described. In a reservoir of uniform depth a ship can
confront by a dynamic barrier within narrow limits of ship's speed and
acceleration. In a wider interval of parameters a ship generates a satellite
wave, which can be transformed in a different-locking soliton. These phenomena
can be classified into an extensive category of dynamic barrier effects
including the transition of aircrafts through the sound barrier.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:34:30 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Zakharov",
"Stanyslav",
""
],
[
"Kryukov",
"Alexey",
""
]
] | [
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] |
801.2296 | Qun Wang | Shou-wan Chen, Jian Deng, Jian-hua Gao, Qun Wang | A general derivation of differential cross section in quark-quark
scatterings at fixed impact parameter | RevTex 4, 3 figures | Front.Phys.China 4:509-516,2009 | 10.1007/s11467-009-0064-0 | null | hep-ph | null | We propose a general derivation of differential cross section in quark-quark
scatterings at fixed impact parameters. The derivation is well defined and free
of ambiguity in the conventional one. The approach can be applied to a variety
of partonic and hadronic scatterings in low or high energy particle collisions.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:39:15 GMT"
}
] | 2009-10-02T00:00:00 | [
[
"Chen",
"Shou-wan",
""
],
[
"Deng",
"Jian",
""
],
[
"Gao",
"Jian-hua",
""
],
[
"Wang",
"Qun",
""
]
] | [
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] |
801.2297 | Werner Bernreuther | Stefan Berge, Werner Bernreuther, Joerg Ziethe | Determining the CP parity of Higgs bosons at the LHC in their tau decay
channels | Latex, 10 pages, 4 figures | Phys.Rev.Lett.100:171605,2008 | 10.1103/PhysRevLett.100.171605 | PITHA 08/01 | hep-ph | null | If neutral Higgs bosons will be discovered at the CERN Large Hadron Collider
(LHC) then an important subsequent issue will be the investigation of their CP
nature. Higgs boson decays into tau lepton pairs are particularly suited in
this respect. Analyzing the three charged pion decay modes of the tau leptons
and taking expected measurement uncertainties at the LHC into account, we show
that the CP properties of a Higgs boson can be pinned down with appropriately
chosen observables, provided that sufficiently large event numbers will
eventually be available.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 13:55:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Berge",
"Stefan",
""
],
[
"Bernreuther",
"Werner",
""
],
[
"Ziethe",
"Joerg",
""
]
] | [
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] |
801.2298 | Uta Fritze | Uta Fritze | Star Cluster Formation and Star Formation: The Role of Environment and
Star Formation Efficiencies | 6 pages, to appear in Young Massive Star Clusters, eds. E. Perez, R.
de Grijs, R. Gonzalez Delgado | Astrophys.Space Sci.324:129-135,2009 | 10.1007/s10509-009-0088-5 | null | astro-ph | null | Analyzing global starburst properties in various kinds of starburst and
post-starburst galaxies and relating them to the properties of the star cluster
populations they form, I explore the conditions for the formation of massive,
compact, long-lived star clusters. The aim is to find out whether the relative
amount of star formation that goes into star cluster formation as opposed to
field star formation, and into the formation of massive long-lived clusters in
particular, is universal or scales with star formation rate, burst strength,
star formation efficiency, galaxy or gas mass, and whether or not there are
special conditions or some threshold for the formation of star clusters that
merit to be called globular clusters a few gigayears later.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:01:13 GMT"
}
] | 2009-12-04T00:00:00 | [
[
"Fritze",
"Uta",
""
]
] | [
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] |
801.2299 | Maria Isabel Garcia de Soria | M. I. Garcia de Soria, P. Maynar, G. Schehr, A. Barrat and E. Trizac | Dynamics of Annihilation I : Linearized Boltzmann Equation and
Hydrodynamics | 22 pages | Phys. Rev. E 77, 051127 (2008) | 10.1103/PhysRevE.77.051127 | null | cond-mat.stat-mech | null | We study the non-equilibrium statistical mechanics of a system of freely
moving particles, in which binary encounters lead either to an elastic
collision or to the disappearance of the pair. Such a system of {\em ballistic
annihilation} therefore constantly looses particles. The dynamics of
perturbations around the free decay regime is investigated from the spectral
properties of the linearized Boltzmann operator, that characterize linear
excitations on all time scales. The linearized Boltzmann equation is solved in
the hydrodynamic limit by a projection technique, which yields the evolution
equations for the relevant coarse-grained fields and expressions for the
transport coefficients. We finally present the results of Molecular Dynamics
simulations that validate the theoretical predictions.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:31:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Soria",
"M. I. Garcia",
""
],
[
"Maynar",
"P.",
""
],
[
"Schehr",
"G.",
""
],
[
"Barrat",
"A.",
""
],
[
"Trizac",
"E.",
""
]
] | [
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] |
801.23 | Antonietta Marino | A. Marino, G. Micela, I. Pillitteri, G. Peres | X-ray variability of NGC 2516 stars in the XMM-Newton observations | 15 pages, 8 figures, published in A&A | Astron.Astrophys.456:977,2006 | 10.1051/0004-6361:20054674 | null | astro-ph | null | We present the characteristics of the X-ray variability of stars in the
cluster NGC2516 as derived from XMM-Newton/EPIC/pn data. The X-ray variations
on short (hours), medium (months), and long (years) time scales have been
explored. We detected 303 distinct X-ray sources by analysing six EPIC/pn
observations; 194 of them are members of the cluster. Stars of all spectral
types, from the early-types to the late-M dwarfs, were detected. The
Kolmogorov-Smirnov test applied to the X-ray photon time series shows that, on
short time scales, only a relatively small fraction (ranging from 6% to 31% for
dG and dF, respectively) of the members of NGC2516 are variable with a
confidence level $\geq$99%; however, it is possible that the fraction is small
only because of the poor statistics. The time X-ray amplitude distribution
functions (XAD) of a set of dF7-dK2 stars, derived on short (hours) and medium
(months) time scales, seem to suggest that medium-term variations, if present,
have a much smaller amplitude than those on short time scales; a similar result
is also obtained for dK3-dM stars. The amplitude variations of late-type stars
in NGC2516 are consistent with those of the coeval Pleiades stars. Comparing
these data with those of ROSAT/PSPC, collected 7-8 years earlier, and of
ROSAT/HRI, just 4-5 years earlier, we find no evidence of significant
variability on the related time scales, suggesting that long-term variations
due to activity cycles similar to the solar cycle are not common among young
stars. Indications of spectral variability was found in one star whose spectra
at three epochs were available.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:03:22 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jan 2008 12:24:09 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Marino",
"A.",
""
],
[
"Micela",
"G.",
""
],
[
"Pillitteri",
"I.",
""
],
[
"Peres",
"G.",
""
]
] | [
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] |
801.2301 | Fei Gao | Fei Gao, Fen-Zhuo Guo, Qiao-Yan Wen, Fu-Chen Zhu | Consistency of shared reference frames should be reexamined | 3 pages, 1 figure, comments are welcome | Physical Review A 77, 014302, 2008 | 10.1103/PhysRevA.77.014302 | null | quant-ph | null | In a recent Letter [G. Chiribella et al., Phys. Rev. Lett. 98, 120501
(2007)], four protocols were proposed to secretly transmit a reference frame.
Here We point out that in these protocols an eavesdropper can change the
transmitted reference frame without being detected, which means the consistency
of the shared reference frames should be reexamined. The way to check the above
consistency is discussed. It is shown that this problem is quite different from
that in previous protocols of quantum cryptography.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:03:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gao",
"Fei",
""
],
[
"Guo",
"Fen-Zhuo",
""
],
[
"Wen",
"Qiao-Yan",
""
],
[
"Zhu",
"Fu-Chen",
""
]
] | [
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801.2302 | Paolo Tieri | Paolo Tieri, Gastone C. Castellani, Claudio Franceschi | Towards an unifying perspective of the fundamental properties and
structural principles governing the immune system | 3 pages, abstract of the poster and oral presentation at SBH2007
SysBioHealth Symposium, Systems Biology for Health, Milano, 17-19 October
2007 | null | null | null | q-bio.OT | null | In the study of the basic properties observed in the immune system and, in a
broader view, in biological systems, several concepts have already been
mathematically formulated or treated in an analytical perspective, such as
degeneracy, robustness, noise, and bow tie architecture. These properties,
among others, seem to rule many aspects of the system functioning, and share
among themselvesseveral characteristics, intersecting each other, and often
becoming one the indivisible part of the other. According to Kitano, systems
biology needs solid theoretical and methodological foundation of principles and
properties, able to lead towards a unified perspective. An effort in unifying
the formalization and analysis of these principles can be now timely attempted.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:05:56 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Tieri",
"Paolo",
""
],
[
"Castellani",
"Gastone C.",
""
],
[
"Franceschi",
"Claudio",
""
]
] | [
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] |
801.2303 | Karina Caputi | K. I. Caputi, the zCOSMOS Collaboration and SCOSMOS Collaboration | The optical spectra of the brightest mid-IR-selected galaxies | To appear in the proceedings of "A Century of Cosmology: past,
present and future", Venice, Italy, August 27-31, 2007. 5 pages, 3 figures | Nuovo Cim.B122:1067-1071,2007 | 10.1393/ncb/i2008-10441-x | null | astro-ph | null | We present here some of the first results we have obtained on the study of
the optical spectra of Spitzer/MIPS 24 micron-selected galaxies in the
COSMOS field. This is part of a series of studies we are conducting to
analyse the optical spectral properties of mid-infrared (mid-IR) galaxies with
different
IR luminosities up to high redshifts. The results shown here correspond to
the brightest S(24 micron)>2 mJy IR galaxy population at z<1.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:15:25 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Caputi",
"K. I.",
""
],
[
"Collaboration",
"the zCOSMOS",
""
],
[
"Collaboration",
"SCOSMOS",
""
]
] | [
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] |
801.2304 | Carlotta Giusti | C. Giusti, F.D. Pacati, M. Schwamb | Recent Advances in the Description of Electromagnetic Two-Nucleon
Knockout Reactions | 19 pages, 6 figures, presented at XVII International School on
Nuclear Physics, Neutron Physics and Applications, September 24-30 2007,
Varna Bulgaria | null | null | null | nucl-th | null | Recent advances in the description of electromagnetic two-nucleon knockout
reactions are reviewed. The sensitivity to different types of correlations and
to their treatment in the nuclear wave functions, the effects of final-state
interactions and the role of center-of-mass effects in connection with the
problem of the lack of orthogonality between initial bound states and final
scattering states obtained by the use of an energy-dependent optical-model
potential are discussed. Results are presented for proton-proton and
proton-neutron knockout off 16O also in comparison with the available data.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:19:46 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Giusti",
"C.",
""
],
[
"Pacati",
"F. D.",
""
],
[
"Schwamb",
"M.",
""
]
] | [
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] |
801.2305 | Benno van den Berg | Benno van den Berg and Ieke Moerdijk | Aspects of Predicative Algebraic Set Theory II: Realizability | null | null | null | null | math.LO math.CT | null | This is the second in a series of papers on the relation between algebraic
set theory and predicative formal systems. In part I, we introduced the notion
of a predicative category of small maps and obtained the result that such
categories always contain a model of set theory. In the present paper, we show
that the familiar realizability models of the constructive set theories CZF and
IZF can be obtained as an application of this result. For this purpose, we show
that predicative categories with small maps are closed under an internal notion
of realizability.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:20:20 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Berg",
"Benno van den",
""
],
[
"Moerdijk",
"Ieke",
""
]
] | [
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] |
801.2306 | Michael Bordag | M. Bordag, V.Skalozub | Polarization tensor of charged gluons in color magnetic background field
at finite temperature | 28 pages, submitted to Phys.Rev.D | Phys.Rev.D77:105013,2008 | 10.1103/PhysRevD.77.105013 | null | hep-th | null | We calculate the polarization tensor of charged gluons in a Abelian
homogeneous magnetic background field at finite temperature in one loop order
Lorentz background field gauge in full generality. Thereby we first determine
the ten independent tensor structures. For the calculation of the corresponding
form factors we use the Schwinger representation and represent form factors as
double parametric integrals and a sum resulting from the Matsubara formalism
used. The integrands are given explicitly in terms of hyperbolic trigonometric
functions. Like in the case of neutral gluons, the polarization tensor is not
transversal. Out of the tensor structures, seven are transversal and three are
not. The nontransversal part follows explicitly from our calculations.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:22:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bordag",
"M.",
""
],
[
"Skalozub",
"V.",
""
]
] | [
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] |
801.2307 | James Shifflett | J. A. Shifflett | A modification of Einstein-Schrodinger theory that contains both general
relativity and electrodynamics | fixed 2 references, accepted by "General Relativity and Gravitation" | Gen.Rel.Grav.40:1745-1769,2008 | 10.1007/s10714-007-0572-6 | null | gr-qc | null | We modify the Einstein-Schrodinger theory to include a cosmological constant
$\Lambda_z$ which multiplies the symmetric metric, and we show how the theory
can be easily coupled to additional fields. The cosmological constant
$\Lambda_z$ is assumed to be nearly cancelled by Schrodinger's cosmological
constant $\Lambda_b$ which multiplies the nonsymmetric fundamental tensor, such
that the total $\Lambda=\Lambda_z+\Lambda_b$ matches measurement. The resulting
theory becomes exactly Einstein-Maxwell theory in the limit as
$|\Lambda_z|\to\infty$. For $|\Lambda_z|\sim 1/(Planck length)^2$ the field
equations match the ordinary Einstein and Maxwell equations except for extra
terms which are $<10^{-16}$ of the usual terms for worst-case field strengths
and rates-of-change accessible to measurement. Additional fields can be
included in the Lagrangian, and these fields may couple to the symmetric metric
and the electromagnetic vector potential, just as in Einstein-Maxwell theory.
The ordinary Lorentz force equation is obtained by taking the divergence of the
Einstein equations when sources are included. The Einstein-Infeld-Hoffmann
(EIH) equations of motion match the equations of motion for Einstein-Maxwell
theory to Newtonian/Coulombian order, which proves the existence of a Lorentz
force without requiring sources. This fixes a problem of the original
Einstein-Schrodinger theory, which failed to predict a Lorentz force. An exact
charged solution matches the Reissner-Nordstrom solution except for additional
terms which are $\sim 10^{-66}$ of the usual terms for worst-case radii
accessible to measurement. An exact electromagnetic plane-wave solution is
identical to its counterpart in Einstein-Maxwell theory.
| [
{
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},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 18:28:17 GMT"
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] | 2008-11-26T00:00:00 | [
[
"Shifflett",
"J. A.",
""
]
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801.2308 | Yu-Jun Cui | Yu-Jun Cui (ENPC-Cermes), Anh-Minh Tang (ENPC-Cermes), Altin Theodore
Mantho (ENPC-Cermes), Emmanuel De Laure (ENPC-Cermes) | Monitoring field soil suction using a miniature tensiometer | null | Geotechnical Testing Journal 31, 1 (2008) 95-100 | 10.1520/GTJ100769 | null | physics.class-ph | null | An experimental device was developed to monitor the field soil suction using
miniature tensiometer. This device consists of a double tube system that
ensures a good contact between the tensiometer and the soil surface at the
bottom of the testing borehole. This system also ensures the tensiometer
periodical retrieving without disturbing the surrounding soil. This device was
used to monitor the soil suction at the site of Boissy-le-Ch\^atel, France. The
measurement was performed at two depths (25 and 45 cm) during two months (May
and June 2004). The recorded suction data are analyzed by comparing with the
volumetric water content data recorded using TDR (Time Domain Reflectometer)
probes as well as the meteorological data. A good agreement between these
results was observed, showing a satisfactory performance of the developed
device.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:30:09 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Cui",
"Yu-Jun",
"",
"ENPC-Cermes"
],
[
"Tang",
"Anh-Minh",
"",
"ENPC-Cermes"
],
[
"Mantho",
"Altin Theodore",
"",
"ENPC-Cermes"
],
[
"De Laure",
"Emmanuel",
"",
"ENPC-Cermes"
]
] | [
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801.2309 | Aleksandr Bekshaev | A. Bekshaev, M.Soskin, M.Vasnetsov | Paraxial Light Beams with Angular Momentum | 87 pages, 37 figures. This is a review originally published in
Ukrainian Journal of Physics (UFZh. Ohlyady. V. 2, No 1, p. 73-113 (2005)).
Besides translation, the text is essentially renewed and materials are
updated. 10 Oct. 2020: misprints are corrected in Eqs. (20), (28), (29), 1st
and 3rd Eqs. in p. 13. Labels of curves are corrected in Fig. 15 | New York: Nova Science Publishers, 2008. ISBN: 978-1-60456-114-2 | null | null | physics.optics physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fundamental and applied concepts concerning the ability of light beams to
carry a certain mechanical angular momentum with respect to the propagation
axis are reviewed and discussed. Following issues are included:
Historical reference;
Angular momentum of a paraxial beam and its constituents;
Spin angular momentum and paradoxes associated with it;
Orbital angular momentum;
Circularly-spiral beams: examples and methods of generation;
Orbital angular momentum and the intensity moments;
Symmetry breakdown and decomposition of the orbital angular momentum;
Mechanical models of the vortex light beams;
Mechanical action of the beam angular momentum;
Rotational Doppler effect, its manifestation in the image rotation;
Spectrum of helical harmonics and associated problems;
Non-collinear rotational Doppler effect;
Properties of a beam forcedly rotating around its own axis.
Research prospects and ways of practical utilization of optical beams with
angular momentum.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 09:40:54 GMT"
},
{
"version": "v2",
"created": "Sat, 10 Oct 2020 12:36:49 GMT"
}
] | 2020-10-13T00:00:00 | [
[
"Bekshaev",
"A.",
""
],
[
"Soskin",
"M.",
""
],
[
"Vasnetsov",
"M.",
""
]
] | [
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] |
801.231 | Philippe Lauren\c{c}ot | Adrien Blanchet, Jos\'e Antonio Carrillo and Philippe Lauren\c{c}ot | Critical mass for a Patlak-Keller-Segel model with degenerate diffusion
in higher dimensions | null | null | null | null | math.AP | null | This paper is devoted to the analysis of non-negative solutions for a
generalisation of the classical parabolic-elliptic Patlak-Keller-Segel system
with $d\ge3$ and porous medium-like non-linear diffusion. Here, the non-linear
diffusion is chosen in such a way that its scaling and the one of the Poisson
term coincide. We exhibit that the qualitative behaviour of solutions is
decided by the initial mass of the system. Actually, there is a sharp critical
mass $M_c$ such that if $M \in (0,M_c]$ solutions exist globally in time,
whereas there are blowing-up solutions otherwise. We also show the existence of
self-similar solutions for $M \in (0,M_c)$. While characterising the eventual
infinite time blowing-up profile for $M=M_c$, we observe that the long time
asymptotics are much more complicated than in the classical Patlak-Keller-Segel
system in dimension two.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:34:24 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Blanchet",
"Adrien",
""
],
[
"Carrillo",
"José Antonio",
""
],
[
"Laurençot",
"Philippe",
""
]
] | [
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] |
801.2311 | Henri Gouin | Henri Gouin (MSNMGP, LMMT) | Adiabatic waves along interfacial layers near the critical point | 12 pages | Comptes Rendus Mecanique 332, 4 (2004) 285-292 | 10.1016/j.crme.2004.01.007 | null | physics.flu-dyn cond-mat.other math-ph math.MP | null | Near the critical point, isothermal interfacial zones are investigated
starting from a non-local density of energy. From the equations of motion of
thermocapillary fluids, we point out a new kind of adiabatic waves propagating
along the interfacial layers. The waves are associated with the second
derivatives of densities and propagate with a celerity depending on the
proximity of the critical point.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:36:06 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Gouin",
"Henri",
"",
"MSNMGP, LMMT"
]
] | [
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-0.0236964971,
-0.0067173499
] |
801.2312 | Fabio Trani | F. Trani, D. Ninno, G. Cantele, G. Iadonisi, K. Hameeuw, E. Degoli, S.
Ossicini | Screening in semiconductor nanocrystals: \textit{Ab initio} results and
Thomas-Fermi theory | null | Phys. Rev. B 73, 245430 (2006) | 10.1103/PhysRevB.73.245430 | null | cond-mat.mtrl-sci | null | A first-principles calculation of the impurity screening in Si and Ge
nanocrystals is presented. We show that isocoric screening gives results in
agreement with both the linear response and the point-charge approximations.
Based on the present ab initio results, and by comparison with previous
calculations, we propose a physical real-space interpretation of the several
contributions to the screening. Combining the Thomas-Fermi theory and simple
electrostatics, we show that it is possible to construct a model screening
function that has the merit of being of simple physical interpretation. The
main point upon which the model is based is that, up to distances of the order
of a bond length from the perturbation, the charge response does not depend on
the nanocrystal size. We show in a very clear way that the link between the
screening at the nanoscale and in the bulk is given by the surface
polarization. A detailed discussion is devoted to the importance of local field
effects in the screening. Our first-principles calculations and the
Thomas-Fermi theory clearly show that in Si and Ge nanocrystals, local field
effects are dominated by surface polarization, which causes a reduction of the
screening in going from the bulk down to the nanoscale. Finally, the model
screening function is compared with recent state-of-the-art ab initio
calculations and tested with impurity activation energies.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:37:04 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Trani",
"F.",
""
],
[
"Ninno",
"D.",
""
],
[
"Cantele",
"G.",
""
],
[
"Iadonisi",
"G.",
""
],
[
"Hameeuw",
"K.",
""
],
[
"Degoli",
"E.",
""
],
[
"Ossicini",
"S.",
""
]
] | [
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801.2313 | Michael Urban | Micaela Oertel (LUTH), Michael Urban (IPNO) | Surface effects in color superconducting strange-quark matter | 13 pages, v2: more detailed explanations, discussion added | Phys.Rev.D77:074015,2008 | 10.1103/PhysRevD.77.074015 | null | nucl-th astro-ph | null | Surface effects in strange-quark matter play an important role for certain
observables which have been proposed in order to identify strange stars, and
color superconductivity can strongly modify these effects. We study the surface
of color superconducting strange-quark matter by solving the
Hartree-Fock-Bogoliubov equations for finite systems ("strangelets") within the
MIT bag model, supplemented with a pairing interaction. Due to the bag-model
boundary condition, the strange-quark density is suppressed at the surface.
This leads to a positive surface charge, concentrated in a layer of ~1 fm below
the surface, even in the color-flavor locked (CFL) phase. However, since in the
CFL phase all quarks are paired, this positive charge is compensated by a
negative charge, which turns out to be situated in a layer of a few tens of fm
below the surface, and the total charge of CFL strangelets is zero. We also
study the surface and curvature contributions to the total energy. Due to the
strong pairing, the energy as a function of the mass number is very well
reproduced by a liquid-drop type formula with curvature term.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:38:11 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Mar 2008 15:05:28 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Oertel",
"Micaela",
"",
"LUTH"
],
[
"Urban",
"Michael",
"",
"IPNO"
]
] | [
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] |
801.2314 | Jarno Talponen | Jarno Talponen | Operators on C_{0}(L,X) whose range does not contain c_{0} | null | null | null | null | math.FA | null | This paper contains the following results: a) Suppose that X is a non-trivial
Banach space and L is a non-empty locally compact Hausdorff space without any
isolated points. Then each linear operator T: C_{0}(L,X)\to C_{0}(L,X), whose
range does not contain C_{00} isomorphically, satisfies the Daugavet equality
||I+T||=1+||T||. b) Let \Gamma be a non-empty set and X, Y be Banach spaces
such that X is reflexive and Y does not contain c_{0} isomorphically. Then any
continuous linear operator T: c_{0}(\Gamma,X)\to Y is weakly compact.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:43:10 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Talponen",
"Jarno",
""
]
] | [
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] |
801.2315 | Oudmaijer | Rene Oudmaijer (Leeds), Ben Davies (RIT), Willem-Jan de Wit (Leeds),
Mitesh Patel (Imperial College) | Post-Red Supergiants | 16 pages. This is an updated and slightly expanded version of a
Keynote Talk given at ``Biggest, Baddest, Coolest Stars'' (ASP Conf Series)
eds. D. Luttermoser, B. Smith, and R. Stencel | null | null | null | astro-ph | null | The yellow hypergiants are found in a stage between the massive Red
Supergiants and the Wolf-Rayet stars. This review addresses current issues
concerning the evolution of massive stars, concentrating on the transitional
post-Red Supergiant phase. Few yellow hypergiants are known and even fewer show
direct evidence for having evolved off the Red Supergiant branch. Indeed, only
two such rare objects with clear evidence for having gone through of a previous
mass losing phase are known, IRC +10420 and HD 179821. We will review their
properties and present recent results employing near-infrared interferometry,
integral field spectroscopy and polarimetry. Finally, their real-time evolution
is discussed.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:08:08 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Oudmaijer",
"Rene",
"",
"Leeds"
],
[
"Davies",
"Ben",
"",
"RIT"
],
[
"de Wit",
"Willem-Jan",
"",
"Leeds"
],
[
"Patel",
"Mitesh",
"",
"Imperial College"
]
] | [
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] |
801.2316 | Hamadi Abidi | Hammadi Abidi, Taoufik Hmidi and Sahbi Keraani | On the global well-posedness for the axisymmetric Euler equations | 28 pages. This is an updated version of the paper
(arXiv:math/0703144). The main result is improved | null | null | null | math.AP | null | This paper deals with the global well-posedness of the 3D axisymmetric Euler
equations for initial data lying in critical Besov spaces $B_{p,1}^{1+3/p}$. In
this case the BKM criterion is not known to be valid and to circumvent this
difficulty we use a new decomposition of the vorticity.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:53:36 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Abidi",
"Hammadi",
""
],
[
"Hmidi",
"Taoufik",
""
],
[
"Keraani",
"Sahbi",
""
]
] | [
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] |
801.2317 | Michael C. Birse | Michael C. Birse (Manchester) | Functional renormalisation group for two-body scattering | 9 pages, RevTeX; some more discussion added and embarrassing misprint
corrected | Phys.Rev.C77:047001,2008 | 10.1103/PhysRevC.77.047001 | null | nucl-th hep-ph | null | The functional renormalisation group is applied to the effective action for
scattering of two nonrelativistic fermions. The resulting physical effective
action is shown to contain the correct threshold singularity. The corresponding
"bare" action respects Galilean invariance up to second order in momenta.
Beyond that order it contains terms that violate this symmetry and, for the
particular regulator considered, nonanalytic third-order terms. The
corresponding potential can be expanded around a nontrivial fixed point using
the power counting appropriate to a system with large scattering length.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:53:39 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 08:43:47 GMT"
},
{
"version": "v3",
"created": "Tue, 11 Mar 2008 16:26:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Birse",
"Michael C.",
"",
"Manchester"
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] |
801.2318 | Ralf Kotulla | R. Kotulla, U. Fritze, P. Anders | Detecting metal-rich intermediate-age Globular Clusters in NGC 4570
using K-band photometry | 5 pages, 2 figures, to appear in Young Massive Star Clusters, eds. E.
Perez, R. de Grijs, R. Gonzalez Delgado | Astrophys.Space Sci.324:347-350,2009 | 10.1007/s10509-009-0093-8 | null | astro-ph | null | Globular Cluster Systems (GCSs) of most early-type galaxies feature two peaks
in their optical colour distributions. Blue-peak GCs are believed to be old and
metal-poor, whereas the ages, metallicities, and the origin of the red-peak GCs
are still being debated. We obtained deep K-band photometry and combined it
with HST observations in g and z to yield a full SED from optical to
near-infrared. This now allows us to break the age-metallicity degeneracy. We
used our evolutionary synthesis models GALEV for star clusters to compute a
large grid of models with different metallicities and a wide range of ages.
Comparing these models to our observations revealed a large population of
intermediate-age (1-3 Gyr) and metalrich (~ solar metallicity) globular
clusters, that will give us further insights into the formation history of this
galaxy.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:55:19 GMT"
}
] | 2009-12-04T00:00:00 | [
[
"Kotulla",
"R.",
""
],
[
"Fritze",
"U.",
""
],
[
"Anders",
"P.",
""
]
] | [
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] |
801.2319 | Alexey Kulik | Alexey M. Kulik | Malliavin calculus for difference approximations of multidimensional
diffusions: truncated local limit theorem | 34 pages | null | null | null | math.PR | null | For a difference approximations of multidimensional diffusion, the truncated
local limit theorem is proved. Under very mild conditions on the distribution
of the difference terms, this theorem provides that the transition
probabilities of these approximations, after truncation of some asymptotically
negligible terms, possess a densities that converge uniformly to the transition
probability density for the limiting diffusion and satisfy a uniform
diffusion-type estimates. The proof is based on the new version of the
Malliavin calculus for the product of finite family of measures, that may
contain non-trivial singular components. An applications for uniform estimates
for mixing and convergence rates for difference approximations to SDE's and for
convergence of difference approximations for local times of multidimensional
diffusions are given.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:11:14 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Kulik",
"Alexey M.",
""
]
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801.232 | Jarno Talponen | Jarno Talponen | A Note on the class of superreflexive almost transitive Banach spaces | null | null | null | null | math.FA | null | The class J of simultaneously almost transitive, uniformly convex and
uniformly smooth Banach spaces is characterized in terms of convex-transitivity
and weak geometry of the norm.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:00:20 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Apr 2008 13:20:07 GMT"
}
] | 2008-04-10T00:00:00 | [
[
"Talponen",
"Jarno",
""
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] |
801.2321 | Alan Watson | A. A. Watson | Highlights from the Pierre Auger Obseervatory - the birth of the hybrid
era | 12 pages. Based on Highlight Talk at ICRC in Merida, Mexico, July
2007 | null | null | null | astro-ph | null | Highlights from the Pierre Auger Observatory are presented. In particular
there is a detailed discussion of of the cosmic ray energy spectrum from 0.3
EeV to 100 EeV and of the mass composition above 1 EeV.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:05:31 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Watson",
"A. A.",
""
]
] | [
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] |
801.2322 | Rodrigo Iglesias | Alfredo Alzaga, Rodrigo Iglesias, Ricardo Pignol | Spectra of symmetric powers of graphs and the Weisfeiler-Lehman
refinements | 14 pages | null | null | null | math.SP math.CO | null | The k-th power of a n-vertex graph X is the iterated cartesian product of X
with itself. The k-th symmetric power of X is the quotient graph of certain
subgraph of its k-th power by the natural action of the symmetric group. It is
natural to ask if the spectrum of the k-th power --or the spectrum of the k-th
symmetric power-- is a complete graph invariant for small values of k, for
example, for k=O(1) or k=O(log n). In this paper, we answer this question in
the negative: we prove that if the well known 2k-dimensional Weisfeiler-Lehman
method fails to distinguish two given graphs, then their k-th powers --and
their k-th symmetric powers-- are cospectral. As it is well known, there are
pairs of non-isomorphic n-vertex graphs which are not distinguished by the
k-dim WL method, even for k=Omega(n). In particular, this shows that for each
k, there are pairs of non-isomorphic n-vertex graphs with cospectral k-th
(symmetric) powers.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:55:58 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Alzaga",
"Alfredo",
""
],
[
"Iglesias",
"Rodrigo",
""
],
[
"Pignol",
"Ricardo",
""
]
] | [
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] |
801.2323 | Shengshan Cui | Shengshan Cui, Alexander M. Haimovich, Oren Somekh, and H. Vincent
Poor | Decentralized Two-Hop Opportunistic Relaying With Limited Channel State
Information | Proceedings of the 2008 IEEE International Symposium on Information
Theory, Toronto, ON, Canada, July 6 - 11, 2008 | null | null | null | cs.IT math.IT | null | A network consisting of $n$ source-destination pairs and $m$ relays is
considered. Focusing on the large system limit (large $n$), the throughput
scaling laws of two-hop relaying protocols are studied for Rayleigh fading
channels. It is shown that, under the practical constraints of single-user
encoding-decoding scheme, and partial channel state information (CSI) at the
transmitters (via integer-value feedback from the receivers), the maximal
throughput scales as $\log n$ even if full relay cooperation is allowed.
Furthermore, a novel decentralized opportunistic relaying scheme with receiver
CSI, partial transmitter CSI, and no relay cooperation, is shown to achieve the
optimal throughput scaling law of $\log n$.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:16:27 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Apr 2008 16:30:30 GMT"
}
] | 2008-04-29T00:00:00 | [
[
"Cui",
"Shengshan",
""
],
[
"Haimovich",
"Alexander M.",
""
],
[
"Somekh",
"Oren",
""
],
[
"Poor",
"H. Vincent",
""
]
] | [
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] |
801.2324 | Marco Polini | Diego Rainis, Marco Polini, M.P. Tosi, and G. Vignale | Spin-drag relaxation time in one-dimensional spin-polarized Fermi gases | 7 pages, 5 figures | Phys. Rev. B 77, 035113 (2008) | 10.1103/PhysRevB.77.035113 | null | cond-mat.str-el | null | Spin propagation in systems of one-dimensional interacting fermions at finite
temperature is intrinsically diffusive. The spreading rate of a spin packet is
controlled by a transport coefficient termed "spin drag" relaxation time
$\tau_{\rm sd}$. In this paper we present both numerical and analytical
calculations of $\tau_{\rm sd}$ for a two-component spin-polarized cold Fermi
gas trapped inside a tight atomic waveguide. At low temperatures we find an
activation law for $\tau_{\rm sd}$, in agreement with earlier calculations of
Coulomb drag between slightly asymmetric quantum wires, but with a different
and much stronger temperature dependence of the prefactor. Our results provide
a fundamental input for microscopic time-dependent spin-density functional
theory calculations of spin transport in 1D inhomogeneous systems of
interacting fermions.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:18:27 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Rainis",
"Diego",
""
],
[
"Polini",
"Marco",
""
],
[
"Tosi",
"M. P.",
""
],
[
"Vignale",
"G.",
""
]
] | [
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] |
801.2325 | Stefano Bonaccorsi | Stefano Bonaccorsi and Elisa Mastrogiacomo | Analysis of the stochastic FitzHugh-Nagumo system | 20 pages | null | null | preprint UTM 719 | math.PR math.AP | null | In this paper we study a system of stochastic differential equations with
dissipative nonlinearity which arise in certain neurobiology models. Besides
proving existence, uniqueness and continuous dependence on the initial datum,
we shall be mainly concerned with the asymptotic behaviour of the solution. We
prove the existence of an invariant ergodic measure $\nu$ associated with the
transition semigroup $P_t$; further, we identify its infinitesimal generator in
the space $L^2(H;\nu)$.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:34:14 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Bonaccorsi",
"Stefano",
""
],
[
"Mastrogiacomo",
"Elisa",
""
]
] | [
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] |
801.2326 | Tamara Grava | Tom Claeys and Tamara Grava | Universality of the break-up profile for the KdV equation in the small
dispersion limit using the Riemann-Hilbert approach | 30 pages | Comm. Math. Phys. 286 (2009), no. 3, 979 1009 | 10.1007/s00220-008-0680-5 | null | math-ph math.AP math.MP | null | We obtain an asymptotic expansion for the solution of the Cauchy problem for
the Korteweg-de Vries (KdV) equation in the small dispersion limit near the
point of gradient catastrophe (x_c,t_c) for the solution of the dispersionless
equation.
The sub-leading term in this expansion is described by the smooth solution of
a fourth order ODE, which is a higher order analogue to the Painleve I
equation. This is in accordance with a conjecture of Dubrovin, suggesting that
this is a universal phenomenon for any Hamiltonian perturbation of a hyperbolic
equation. Using the Deift/Zhou steepest descent method applied on the
Riemann-Hilbert problem for the KdV equation, we are able to prove the
asymptotic expansion rigorously in a double scaling limit.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:38:34 GMT"
}
] | 2015-10-07T00:00:00 | [
[
"Claeys",
"Tom",
""
],
[
"Grava",
"Tamara",
""
]
] | [
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] |
801.2327 | Antonietta Marino | A. Marino, R. Rampazzo, G. Trinchieri, R. Gruetzbauch, M.S. Clemens | Far UV and X-ray observation: a hot view of shell galaxies | 4 pages, 3 figures, Proceedings of the 1st. NUVA Conference, Space
Astronomy: the UV window to the Universe, Madrid 2007 | null | null | null | astro-ph | null | Shell galaxies are considered the debris of recent accretion/merging
episodes. Their high frequency in low density environments suggest that such
episodes could drive the secular evolution for at least some fraction of the
early-type galaxy population. We present here the preliminary results of
ultraviolet and X-ray data for a sample of three shell galaxies, namely NGC
474, NGC 7070A and ESO 2400100. The Far UV morphology and photometry are
derived using the observations obtained with the Galaxy Evolution Explorer and
the XMM- Newton Optical Monitor. We aim at investigating the rejuvenation
processes in the stellar population using the UV information as well as at
gaining information about the possible evolution with time of the X-ray
emission due interaction/merging processes.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 15:42:51 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Marino",
"A.",
""
],
[
"Rampazzo",
"R.",
""
],
[
"Trinchieri",
"G.",
""
],
[
"Gruetzbauch",
"R.",
""
],
[
"Clemens",
"M. S.",
""
]
] | [
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] |
801.2328 | Antonietta Marino | A. Marino, R. Rampazzo, R. Tantalo, D. Bettoni, L. M. Buson, C.
Chiosi, G. Galletta | The GALEX UV emission in shell galaxies | 2 pages, Proceedings of the Conference 'Formation and evolution of
galaxies disks', Rome 2007 | null | null | null | astro-ph | null | Shell galaxies are widely considered the debris of recent accretion/merging
episodes. Their high frequency in low density environment suggests that such
episodes could be among the driver of the early-type galaxy secular evolution.
We present far and near UV (FUV and NUV respectively hereafter) GALEX
photometric properties of a sample of shell galaxies.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:14:01 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Marino",
"A.",
""
],
[
"Rampazzo",
"R.",
""
],
[
"Tantalo",
"R.",
""
],
[
"Bettoni",
"D.",
""
],
[
"Buson",
"L. M.",
""
],
[
"Chiosi",
"C.",
""
],
[
"Galletta",
"G.",
""
]
] | [
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] |
801.2329 | Stefan Alin | Alin Stefan | A class of transversal polymatroids with Gorenstein base ring | 9 pages | null | null | null | math.AC | null | In this paper, the principal tool to describe transversal polymatroids with
Gorenstein base ring is polyhedral geometry, especially the $Danilov-Stanley$
theorem for the characterization of canonical module. Also, we compute the
$a-invariant$ and the Hilbert series of base ring associated to this class of
transversal polymatroids.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:17:17 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Stefan",
"Alin",
""
]
] | [
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] |
801.233 | Enrico Perfetto | E. Perfetto | Auger transitions in one-dimensional metals | 6 pages, 2 figures. To appear in Phys. Rev. B | null | null | null | cond-mat.str-el cond-mat.mes-hall | null | We present a dynamical theory of the Auger decay in one-dimensional (1D)
metals described by the Tomonaga-Luttinger model. An analytic expression of the
Auger current is derived in the framework of the 1-step approach, where the
finite lifetime of the initial core-hole and the core-valence interaction are
taken into account. This allows to capture typical dynamical features like the
shake-down effect, in which the Auger spectrum shows a non-vanishing weight
above the 2-step high-energy threshold. The obtained results give also a hint
to understand the sizable suppression of Auger spectral weight closed to the
Fermi energy recently observed in carbon nanotubes with respect to graphite.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:31:24 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Perfetto",
"E.",
""
]
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801.2331 | Henri Gouin | Henri Gouin (MSNMGP, LMMT), Sergey Gavrilyuk | Dissipative Two-Fluid Models | dedicated to Guy Boillat : 13 pages | Rendiconti del Circolo Matematico di Palermo suppl. 78, Serie II
(2006) 133-145 | null | null | math-ph math.MP physics.flu-dyn | null | From Hamilton's principle of stationary action, we derive governing equations
of two-fluid mixtures and extend the model to the dissipative case without
chemical reactions. For both conservative and dissipative cases, an algebraic
identity connecting equations of momentum, mass, energy and entropy is obtained
by extending the Gibbs identity in dynamics. The obtained system is hyperbolic
for small relative velocity of the phases.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:39:06 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Gouin",
"Henri",
"",
"MSNMGP, LMMT"
],
[
"Gavrilyuk",
"Sergey",
""
]
] | [
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] |
801.2332 | Matthew B. Stone | M. B. Stone, M. D. Lumsden, Y. Qiu, E. C. Samulon, C. D. Batista, I.
R. Fisher | Dispersive magnetic excitations in the S=1 antiferromagnet
Ba$_3$Mn$_2$O$_8$ | 8 pages, 8 figures, Submitted to Physical Review B, Resubmited
version | null | 10.1103/PhysRevB.77.134406 | null | cond-mat.str-el | null | We present powder inelastic neutron scattering measurements of the S=1
dimerized antiferromagnet Ba$_3$Mn$_2$O$_8$. The $T=1.4$ K magnetic spectrum
exhibits a spin-gap of $\Delta \approx 1.0$ meV and a dispersive spectrum with
a bandwidth of approximately 1.5 meV. Comparison to coupled dimer models
describe the dispersion and scattering intensity accurately and determine the
exchange constants in Ba$_3$Mn$_2$O$_8$. The wave vector dependent scattering
intensity confirms the proposed S=1 dimer bond. Temperature dependent
measurements of the magnetic excitations indicate the presence of both
singlet-triplet and thermally activated triplet-quintet excitations.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:41:00 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 13:45:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stone",
"M. B.",
""
],
[
"Lumsden",
"M. D.",
""
],
[
"Qiu",
"Y.",
""
],
[
"Samulon",
"E. C.",
""
],
[
"Batista",
"C. D.",
""
],
[
"Fisher",
"I. R.",
""
]
] | [
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801.2333 | Henri Gouin | Sergey Gavrilyuk, Henri Gouin (MSNMGP, LMMT) | A new form of governing equations of fluids arising from Hamilton's
principle | 28 pages | International Journal of Engineering Science / International
Journal of Engineering Sciences 37, 12 (1999) 1495-1520 | 10.1016/S0020-7225(98)00131-1 | null | physics.flu-dyn math-ph math.GM math.MP | null | A new form of governing equations is derived from Hamilton's principle of
least action for a constrained Lagrangian, depending on conserved quantities
and their derivatives with respect to the time-space. This form yields
conservation laws both for non-dispersive case (Lagrangian depends only on
conserved quantities) and dispersive case (Lagrangian depends also on their
derivatives). For non-dispersive case the set of conservation laws allows to
rewrite the governing equations in the symmetric form of
Godunov-Friedrichs-Lax. The linear stability of equilibrium states for
potential motions is also studied. In particular, the dispersion relation is
obtained in terms of Hermitian matrices both for non-dispersive and dispersive
case. Some new results are extended to the two-fluid non-dispersive case.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:41:22 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Gavrilyuk",
"Sergey",
"",
"MSNMGP, LMMT"
],
[
"Gouin",
"Henri",
"",
"MSNMGP, LMMT"
]
] | [
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] |
801.2334 | Alexander Vasil'ev | Irina Markina, Alexander Vasil'ev | Virasoro Algebra and L\"owner-Kufarev Equations | 23 pages | null | null | null | math-ph math.CV math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Contour dynamics is a classical subject both in physics and in complex
analysis. We show that the dynamics provided by the L\"owner-Kufarev ODE and
PDE possesses a rigid algebraic structure given by the Virasoro algebra.
Namely, the `positive' Virasoro generators span the holomorphic part of the
complexified vector bundle over the space of univalent functions, smooth on the
boundary. In the covariant formulation they are conserved by the
L\"owner-Kufarev evolution. The `negative' Virasoro generators span the
antiholomorphic part. They contain a conserved term and we give an iterative
method to obtain them based on the Poisson structure of the L\"owner-Kufarev
evolution. The L\"owner-Kufarev PDE provides a distribution of the tangent
bundle of non-normalized univalent functions, which forms the tangent bundle of
normalized ones. It also gives an explicit correspondence between the latter
bundle and the holomorphic eigen space of the complexified Lie algebra of
vector fields on the unit circle. Finally, we give Hamiltonian and Lagrangian
formulations of the motion within the coefficient body in the field of an
elliptic operator constructed by means of Virasoro generators. We also discuss
relations between CFT and SLE.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:42:43 GMT"
},
{
"version": "v2",
"created": "Fri, 15 May 2009 12:43:28 GMT"
}
] | 2009-05-15T00:00:00 | [
[
"Markina",
"Irina",
""
],
[
"Vasil'ev",
"Alexander",
""
]
] | [
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] |
801.2335 | Daniel Silevitch | D.M. Silevitch, D. Bitko, J. Brooke, S. Ghosh, G. Aeppli, T. F.
Rosenbaum | Ferromagnet in a continuously tuneable random field | null | Nature v448 567 (2007) | 10.1038/nature06050 | null | cond-mat.dis-nn | null | The Random-Field Ising Model (RFIM) has been extensively studied as a model
system for understanding the effects of disorder in magnets. Since the late
1970s, there has been a particular focus on realizations of the RFIM in
site-diluted antiferromagnets. We observe random-field effects in the dilute
dipole-coupled ferromagnet $\mathrm{LiHo}_x\mathrm{Y}_{1-x}\mathrm{F}_4$. In
the presence of a magnetic field transverse to the Ising axis ($H_t$), the
behavior of $\mathrm{LiHo}_x\mathrm{Y}_{1-x}\mathrm{F}_4$ becomes increasingly
dominated by the influence of random-field terms in the effective Hamiltonian.
This is seen experimentally in the shape of the ferromagentic-paramagnetic
phase boundary and in changes to the critical exponents near the classical
critical point. We find that above the classical critical point the magnetic
susceptibility diverges as $H_t\to0$, and that the susceptibility both above
and below the classical critical point can be collapsed onto a single universal
curve using a modified Curie law which explicitly incorporates random-field
contributions. The discovery of a ferromagnetic realization of the RFIM opens
the door to investigation of the random-field problem with the wide variety of
techniques available for probing ferromagnets, including the ability to examine
both the statics and dynamics of the random-field problem. It also allows
studying the effects of controlled amounts of randomness on the dynamics of
domain pinning and the energetics of domain reversal.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:46:38 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Silevitch",
"D. M.",
""
],
[
"Bitko",
"D.",
""
],
[
"Brooke",
"J.",
""
],
[
"Ghosh",
"S.",
""
],
[
"Aeppli",
"G.",
""
],
[
"Rosenbaum",
"T. F.",
""
]
] | [
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801.2336 | Andras Telcs | Andras Telcs | The Einstein relation for random walks on graphs | null | Journal of Statistical Physics, 122, 4, 2006, 617-645 | null | null | math.PR | null | This paper investigates the Einstein relation; the connection between the
volume growth, the resistance growth and the expected time a random walk needs
to leave a ball on a weighted graph. The Einstein relation is proved under
different set of conditions. In the simplest case it is shown under the volume
doubling and time comparison principles. This and the other set of conditions
provide the basic framework for the study of (sub-) diffusive behavior of the
random walks on weighted graphs.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:54:10 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Telcs",
"Andras",
""
]
] | [
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] |
801.2337 | Sadhan Adhikari K | Sadhan K. Adhikari and Boris A. Malomed | Symbiotic gap and semi-gap solitons in Bose-Einstein condensates | 5 pages, 9 figures | Phys. Rev. A 77 (2008) 023607 (pp1-5) | 10.1103/PhysRevA.77.023607 | null | cond-mat.other nlin.PS | null | Using the variational approximation and numerical simulations, we study
one-dimensional gap solitons in a binary Bose-Einstein condensate trapped in an
optical-lattice potential. We consider the case of inter-species repulsion,
while the intra-species interaction may be either repulsive or attractive.
Several types of gap solitons are found: symmetric or asymmetric; unsplit or
split, if centers of the components coincide or separate; intra-gap (with both
chemical potentials falling into a single bandgap) or inter-gap, otherwise. In
the case of the intra-species attraction, a smooth transition takes place
between solitons in the semi-infinite gap, the ones in the first finite
bandgap, and semi-gap solitons (with one component in a bandgap and the other
in the semi-infinite gap).
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:58:18 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jan 2008 18:55:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Adhikari",
"Sadhan K.",
""
],
[
"Malomed",
"Boris A.",
""
]
] | [
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] |
801.2338 | Eugene V. Sukhorukov | Ivan P. Levkivskyi, Eugene V. Sukhorukov | Dephasing in the electronic Mach-Zehnder interferometer at filling
factor 2 | 14 pages, 11 figures | Phys. Rev. B 78, 045322 (2008) | 10.1103/PhysRevB.78.045322 | null | cond-mat.mes-hall | null | We propose a simple physical model which describes dephasing in the
electronic Mach-Zehnder interferometer at filling factor 2. This model explains
very recent experimental results, such as the unusual lobe-type structure in
the visibility of Aharonov-Bohm oscillations, phase rigidity, and the asymmetry
of the visibility as a function of transparencies of quantum point contacts.
According to our model, dephasing in the interferometer originates from strong
Coulomb interaction at the edge of two-dimensional electron gas. The long-range
character of the interaction leads to a separation of the spectrum of edge
excitations on slow and fast mode. These modes are excited by electron
tunneling and carry away the phase information. The new energy scale associated
with the slow mode determines the temperature dependence of the visibility and
the period of its oscillations as a function of voltage bias. Moreover, the
variation of the lobe structure from one experiment to another is explained by
specific charging effects, which are different in all experiments. We propose
to use a strongly asymmetric Mach-Zehnder interferometer with one arm being
much shorter than the other for the spectroscopy of quantum Hall edge states.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 16:58:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Levkivskyi",
"Ivan P.",
""
],
[
"Sukhorukov",
"Eugene V.",
""
]
] | [
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801.2339 | Sergei Loktev | P. Etingof, S. Loktev, A. Oblomkov, L. Rybnikov | A Lie-theoretic construction of spherical symplectic reflection algebras | LaTeX, 17 pages, 2 figures. Final version | Transformation Groups, 13 (2008), no. 3, pp. 541-556 | null | ITEP-TH-61/07 | math.QA math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a construction of the spherical subalgebra of a symplectic
reflection algebra of an arbitrary rank corresponding to a star-shaped affine
Dynkin diagram. Namely, it is obtained from the universal enveloping algebra of
a certain semi-simple Lie algebra by the process of quantum Hamiltonian
reduction. As an application, we propose a construction of finite-dimensional
representations of the spherical subalgebra.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:06:52 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Apr 2008 18:53:51 GMT"
},
{
"version": "v3",
"created": "Fri, 1 Aug 2008 07:43:36 GMT"
}
] | 2010-12-15T00:00:00 | [
[
"Etingof",
"P.",
""
],
[
"Loktev",
"S.",
""
],
[
"Oblomkov",
"A.",
""
],
[
"Rybnikov",
"L.",
""
]
] | [
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] |
801.234 | Gennady Kozlov | G.A. Kozlov | Bose-Einstein correlations of neutral gauge bosons in $pp$ collisions | 14 pages | Phys.Part.Nucl.Lett.6:106-113,2009 | 10.1134/S1547477109020022 | null | hep-ph | null | The theory for Bose-Einstein correlations in case of neutral gauge bosons in
$pp$ collisions at high energies is presented. Based on quantum field theory at
finite temperature the two-particle Bose-Einstein correlations of neutral gauge
bosons are carried out for the first time. As a result, the important
parameters of the correlation functions can be obtained for the $Z^{0}Z^{0}$
pairs. The correlations of two bosons in 4-momentum space presented in this
paper offer useful and instructive complimentary viewpoints to theoretical and
experimental works in multiparticle femtoscopy and interferometry measurements
at hadron colliders.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:08:14 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Kozlov",
"G. A.",
""
]
] | [
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] |
801.2341 | Andras Telcs | Andras Telcs | Upper bounds for transition probabilities on graphs and isoperimetric
inequalities | graphics are not included | Markov Processes and Related Fields, 12,2006, 1,1-26 | null | null | math.PR | null | In this paper necessary and sufficient conditions are presented for heat
kernel upper bounds for random walks on weighted graphs. Several equivalent
conditions are given in the form of isoperimetric inequalities.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:12:40 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Telcs",
"Andras",
""
]
] | [
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] |
801.2342 | Enrico Maria Corsini | A. Pizzella (1), D. Tamburro (2), E. M. Corsini (1), F. Bertola (1)
((1) Universita` di Padova, Italy, (2), MPIA, Germany) | Detection of non-ordered central gas motions in a sample of four low
surface brightness galaxies | 7 pages, 4 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20066580 | null | astro-ph | null | We present integral-field spectroscopy of the ionized gas in the central
regions of four galaxies with a low surface brightness disk taken with the
Visible Multi Object Spectrograph at the Very Large Telescope and aimed at
testing the accuracy in the determination of the central logarithmic slope
$\alpha$ of the mass density radial profile $\rho(r) \propto r^\alpha$ in this
class of objects. For all the sample galaxies we subtracted from the observed
velocity field the best-fit model of gas in circular motions and derived the
residuals. Only ESO-LV 5340200 is characterized by a regular velocity field. We
extracted the velocity curves of this galaxy along several position angles, in
order to estimate the uncertainty in deriving the central gradient of the total
mass density from long-slit spectroscopy. We report the detection of strong
non-ordered motions of the ionized gas in three out of four sample galaxies.
The deviations have velocity amplitudes and spatial scales that make not
possible to disentangle between cuspy and core density radial profiles.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:27:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pizzella",
"A.",
"",
"Universita` di Padova, Italy"
],
[
"Tamburro",
"D.",
"",
", MPIA, Germany"
],
[
"Corsini",
"E. M.",
"",
"Universita` di Padova, Italy"
],
[
"Bertola",
"F.",
"",
"Universita` di Padova, Italy"
]
] | [
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] |
801.2343 | Konstantin Krutitsky | K.V.Krutitsky, M.Thorwart, R.Egger, R.Graham | Ultracold bosons in lattices with binary disorder | null | Phys.Rev.A 77, 053609 (2008) | 10.1103/PhysRevA.77.053609 | null | cond-mat.dis-nn cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum phases of ultracold bosons with repulsive interactions in lattices in
the presence of quenched disorder are investigated. The disorder is assumed to
be caused by the interaction of the bosons with impurity atoms having a large
effective mass. The system is described by the Bose-Hubbard Hamiltonian with
random on-site energies which have a discrete binary probability distribution.
The phase diagram at zero temperature is calculated using several methods like
a strong-coupling expansion, an exact numerical diagonalization, and a
Bose-Fermi mapping valid in the hard-core limit. It is shown that the
Mott-insulator phase exists for any strength of disorder in contrast to the
case of continuous probability distribution. We find that the compressibility
of the Bose glass phase varies in a wide range and can be extremely low.
Furthermore, we evaluate experimentally accessible quantities like the momentum
distribution, the static and dynamic structure factors, and the density of
excited states. The influence of finite temperature is discussed as well.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:21:14 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Jun 2008 17:47:05 GMT"
}
] | 2008-06-27T00:00:00 | [
[
"Krutitsky",
"K. V.",
""
],
[
"Thorwart",
"M.",
""
],
[
"Egger",
"R.",
""
],
[
"Graham",
"R.",
""
]
] | [
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] |
801.2344 | Elena Ginina | Elena Ginina | CP asymmetries in charged Higgs boson decays in MSSM | 9 pages, 7 figures, contribution to the 4th workshop "Gravity,
Astrophysics, and Strings at the Black Sea", Primorsko, Bulgaria, June 10-16,
2007 | null | null | null | hep-ph | null | In the Standard Model with Minimal Supersymmetry, the Lagrangian contains
complex parameters which lead to additional CP violation. We study CP violating
asymmetries in the decays of the MSSM charged Higgs boson, induced by loop
corrections with intermediate SUSY particles, and perform analytical and
numerical analysis. The decay rate asymmetry can go up to 25% and the
forward-backward asymmetry can reach up to 10%.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:36:39 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Ginina",
"Elena",
""
]
] | [
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801.2345 | Marko A. Rodriguez | Marko A. Rodriguez and Alberto Pepe | On the relationship between the structural and socioacademic communities
of a coauthorship network | null | Journal of Informetrics, volume 2, issue 3, pages 195-201, ISSN:
1751-1577, Elsevier, July 2008 | 10.1016/j.joi.2008.04.002 | LA-UR-07-8339 | cs.DL physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article presents a study that compares detected structural communities
in a coauthorship network to the socioacademic characteristics of the scholars
that compose the network. The coauthorship network was created from the
bibliographic record of a multi-institution, interdisciplinary research group
focused on the study of sensor networks and wireless communication. Four
different community detection algorithms were employed to assign a structural
community to each scholar in the network: leading eigenvector, walktrap, edge
betweenness and spinglass. Socioacademic characteristics were gathered from the
scholars and include such information as their academic department, academic
affiliation, country of origin, and academic position. A Pearson's $\chi^2$
test, with a simulated Monte Carlo, revealed that structural communities best
represent groupings of individuals working in the same academic department and
at the same institution. A generalization of this result suggests that, even in
interdisciplinary, multi-institutional research groups, coauthorship is
primarily driven by departmental and institutional affiliation.
| [
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"created": "Tue, 15 Jan 2008 17:26:20 GMT"
},
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"version": "v2",
"created": "Sat, 5 Apr 2008 23:09:47 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Jul 2008 15:54:14 GMT"
}
] | 2021-08-23T00:00:00 | [
[
"Rodriguez",
"Marko A.",
""
],
[
"Pepe",
"Alberto",
""
]
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] |
801.2346 | Jonathan Engel | J. Terasaki, J. Engel, G.F. Bertsch | Systematics of the first 2+ excitation in spherical nuclei with
Skryme-QRPA | 16 pages, 10 figures. v2: Rewritten with somewhat different emphasis
and conclusions, and additional analysis. Complete set of numerical results
available at http://www.unedf.org/qrpa | AIP Conf.Proc.1128:48-58,2009 | 10.1063/1.3146220 | INT PUB 08-23 | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the Quasiparticle Random Phase Approximation (QRPA) and the Skyrme
interactions SLy4 and SkM* to systematically calculate energies and transition
strengths for the lowest 2+ state in spherical even-even nuclei.The SkM*
functional, applied to 178 spherical nuclei between Z=10 and 90, produces
excitation energies that are on average 11% higher than experimental values,
with residuals that fluctuate about the average by -35%+55%. The predictions of
SkM* and SLy4 have significant differences, in part because of differences in
the calculated ground state deformations; SkM* performs better in both the
average and dispersion of energies. Comparing the QRPA results with those of
generator-coordinate-method (GCM) calculations, we find that the QRPA
reproduces trends near closed shells better than the GCM, and overpredicts the
energies less severely in general. We attribute part of the difference to a
deficiency in the way the GCM is implemented.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:43:13 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jul 2008 09:52:15 GMT"
}
] | 2009-06-12T00:00:00 | [
[
"Terasaki",
"J.",
""
],
[
"Engel",
"J.",
""
],
[
"Bertsch",
"G. F.",
""
]
] | [
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] |
801.2347 | Vitaly Khudobakhshov | V. A. Buslov, V. A. Khudobakhshov | On the Minimum Spanning Tree for Directed Graphs with Potential Weights | 3 pages | null | null | null | cs.DM | null | In general the problem of finding a miminum spanning tree for a weighted
directed graph is difficult but solvable. There are a lot of differences
between problems for directed and undirected graphs, therefore the algorithms
for undirected graphs cannot usually be applied to the directed case. In this
paper we examine the kind of weights such that the problems are equivalent and
a minimum spanning tree of a directed graph may be found by a simple algorithm
for an undirected graph.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:06:28 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Buslov",
"V. A.",
""
],
[
"Khudobakhshov",
"V. A.",
""
]
] | [
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] |
801.2348 | Alexander Kamenshchik | Francesco Cannata, Alexander Yu. Kamenshchik, Daniele Regoli | Scalar field cosmological models with finite scale factor singularities | 6 pages, 3 figures | Phys.Lett.B670:241-245,2009 | 10.1016/j.physletb.2008.06.077 | null | gr-qc astro-ph hep-th | null | We construct a scalar field based cosmological model, possessing a
cosmological singularity characterized by a finite value of the cosmological
radius and an infinite scalar curvature. Using the methods of the qualitative
theory of differential equations, we give a complete description of the
cosmological evolutions in the model under consideration. There are four
classes of evolutions, two of which have finite lifetimes, while the other two
undergo an infinite expansion.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:52:41 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Cannata",
"Francesco",
""
],
[
"Kamenshchik",
"Alexander Yu.",
""
],
[
"Regoli",
"Daniele",
""
]
] | [
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] |
801.2349 | Cristian Marchioli Dr. | C. Marchioli, A. Soldati, J.G.M. Kuerten, B. Arcen, A. Taniere, G.
Goldensoph, K.D. Squires, M.F. Cargnelutti and L.M. Portela | Statistics of particle dispersion in Direct Numerical Simulations of
wall-bounded turbulence: results of an international collaborative benchmark
test | null | null | null | null | physics.flu-dyn | null | In this paper, the results of an international collaborative test case
relative to the production of a Direct Numerical Simulation and Lagrangian
Particle Tracking database for turbulent particle dispersion in channel flow at
low Reynolds number are presented. The objective of this test case is to
establish a homogeneous source of data relevant to the general problem of
particle dispersion in wall-bounded turbulence. Different numerical approaches
and computational codes have been used to simulate the particle-laden flow and
calculations have been carried on long enough to achieve a statistically-steady
condition for particle distribution. In such stationary regime, a comprehensive
database including both post-processed statistics and raw data for the fluid
and for the particles has been obtained. The complete datasets can be
downloaded from the web at http://cfd.cineca.it/cfd/repository/. In this paper,
the most relevant velocity statistics (for both phases) and particle
distribution statistics are discussed and benchmarked by direct comparison
between the different numerical predictions.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:11:21 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Marchioli",
"C.",
""
],
[
"Soldati",
"A.",
""
],
[
"Kuerten",
"J. G. M.",
""
],
[
"Arcen",
"B.",
""
],
[
"Taniere",
"A.",
""
],
[
"Goldensoph",
"G.",
""
],
[
"Squires",
"K. D.",
""
],
[
"Cargnelutti",
"M. F.",
""
],
[
"Portela",
"L. M.",
""
]
] | [
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801.235 | Spiga Daniele | D. Spiga, G. Pareschi, R. Canestrari, V. Cotroneo | Estimation of X-ray scattering impact in imaging degradation for the
SIMBOL-X telescope | Memorie della Societa' Astronomica ITaliana. 3 pages, 3 figures,
Proceedings of the International Workshop "Simbol-X: the hard X-ray universe
in focus", May 2007, Bologna (Italy). Typos corrected | null | null | null | astro-ph | null | The imaging performance of X-ray optics (expressed in terms of HEW,
Half-Energy-Width) can be severely affected by X-ray scattering caused by the
surface roughness of the mirrors. The impact of X-ray scattering has an
increasing relevance for increasing photon energy, and can be the dominant
problem in a hard X-ray telescope like SIMBOL-X. In this work we show how, by
means of a novel formalism, we can derive a surface roughness tolerance - in
terms of its power spectrum - from a specific HEW requirement for the SIMBOL-X
optical module.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:52:52 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Spiga",
"D.",
""
],
[
"Pareschi",
"G.",
""
],
[
"Canestrari",
"R.",
""
],
[
"Cotroneo",
"V.",
""
]
] | [
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801.2351 | Andras Telcs | Andras Telcs | Random walks on graphs with volume and time doubling | this version is without figures | Rev. Mat. Iberoamericana 22, no. 1 (2006), 17--54 | null | null | math.PR | null | This paper studies the on- and off-diagonal upper estimate and the two-sided
transition probability estimate of random walks on weighted graphs.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:09:04 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Telcs",
"Andras",
""
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] |
801.2352 | James M. Borger | James Borger, Bart de Smit | Galois theory and integral models of Lambda-rings | Probably the final version | null | null | null | math.KT math.NT | null | We show that any Lambda-ring, in the sense of Riemann-Roch theory, which is
finite etale over the rational numbers and has an integral model as a
Lambda-ring is contained in a product of cyclotomic fields. In fact, we show
that the category of them is described in a Galois-theoretic way in terms of
the monoid of pro-finite integers under multiplication and the cyclotomic
character. We also study the maximality of these integral models and give a
more precise, integral version of the result above. These results reveal an
interesting relation between Lambda-rings and class field theory.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:10:01 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Borger",
"James",
""
],
[
"de Smit",
"Bart",
""
]
] | [
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] |
801.2353 | Seyed Akbar Jafari | M.B. Fathi, S.A. Jafari | Dynamical Mean Field Theory equations on nearly real frequency axis | revisions corresponding to adding a new Fig. 4 | null | null | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Iterated Perturbation Theory (IPT) equations of the Dynamical Mean Field
Theory (DMFT) for the half-filled Hubbard model, are solved on nearly real
frequencies at various values of the Hubbard parameters $U$, to investigate the
nature of metal-insulator transition (MIT) at finite temperatures. This method
avoids the instabilities associated with the infamous Pad\'e analytic
continuation and reveals fine structures across the MIT at finite temperatures,
which {\em can not be captured} by conventional methods for solving DMFT
equations on Matsubara frequencies. Our method suggests that at finite
temperatures, there is an abrupt decrease in the height of the quasi-particle
(Kondo) peak at a critical value of $U_c$, to a non-zero but small bump which
gradually suppresses as one moves deeper into the {\em bad} insulator regime.
In contrast to Vollhardt and coworkers [J. Phys. Soc. Jpn. {\bf 74} (2005)
136], down to $T=0.01$ of the half-bandwidth we find no $T^*$ separating bad
insulator from a true Mott insulator.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:25:56 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Apr 2008 15:48:53 GMT"
},
{
"version": "v3",
"created": "Tue, 5 Aug 2008 19:49:39 GMT"
}
] | 2008-08-05T00:00:00 | [
[
"Fathi",
"M. B.",
""
],
[
"Jafari",
"S. A.",
""
]
] | [
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801.2354 | Francesc Rossell\'o | Gabriel Cardona, Merce Llabres, Francesc Rossello and Gabriel Valiente | Two metrics for general phylogenetic networks | 9 pages | null | null | null | q-bio.PE q-bio.QM | null | We prove that Nakhleh's latest dissimilarity measure for phylogenetic
networks separates distinguishable phylogenetic networks, and that a slight
modification of it provides a true distance on the class of all phylogenetic
networks.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:23:10 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Cardona",
"Gabriel",
""
],
[
"Llabres",
"Merce",
""
],
[
"Rossello",
"Francesc",
""
],
[
"Valiente",
"Gabriel",
""
]
] | [
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] |
801.2355 | Enrico Valdinoci | Yannick Sire and Enrico Valdinoci | Fractional Laplacian phase transitions and boundary reactions: a
geometric inequality and a symmetry result | null | null | null | null | math.AP math.FA | null | We deal with symmetry properties for solutions of nonlocal equations of the
type $(-\Delta)^s v= f(v)\qquad {in $\R^n$,}$ where $s \in (0,1)$ and the
operator $(-\Delta)^s$ is the so-called fractional Laplacian. The study of this
nonlocal equation is made via a careful analysis of the following degenerate
elliptic equation
${-div (x^\a \nabla u)=0 \qquad {on $\R^n\times(0,+\infty)$}
-x^\a u_x = f(u) \qquad {on $\R^n\times\{0\}$} $
where $\a \in (-1,1)$. This equation is related to the fractional Laplacian
since the Dirichlet-to-Neumann operator $\Gamma_\a: u|_{\partial \R^{n+1}_+}
\mapsto -x^\a u_x |_{\partial \R^{n+1}_+} $ is $(-\Delta)^{\frac{1-\a}{2}}$.
This equation is related to the fractional Laplacian since the
Dirichlet-to-Neumann operator $\Gamma_\a: u|_{\partial \R^{n+1}_+} \mapsto
-x^\a u_x |_{\partial \R^{n+1}_+} $ is $(-\Delta)^{\frac{1-\a}{2}}$. More
generally, we study the so-called boundary reaction equations given by
${-div (\mu(x) \nabla u)+g(x,u)=0 {on $\R^n\times(0,+\infty)$}
- \mu(x) u_x = f(u) {on $\R^n\times{0}$}$
under some natural assumptions on the diffusion coefficient $\mu$ and on the
nonlinearities $f$ and $g$. We prove a geometric formula of Poincar\'e-type for
stable solutions, from which we derive a symmetry result in the spirit of a
conjecture of De Giorgi.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:23:14 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Sire",
"Yannick",
""
],
[
"Valdinoci",
"Enrico",
""
]
] | [
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] |
801.2356 | Leigh Jenkins | L. P. Jenkins, W. N. Brandt, E. J. M. Colbert, A. J. Levan, T. P.
Roberts, M. J. Ward, A. Zezas | New insights into the X-ray properties of the nearby barred spiral
galaxy NGC 1672 | 4 pages, 3 figures; to be published in the proceedings of the ESA
workshop "X-rays from Nearby Galaxies" | null | null | null | astro-ph | null | We present some preliminary results from new Chandra and XMM-Newton X-ray
observations of the nearby barred spiral galaxy NGC1672. It shows dramatic
nuclear and extra-nuclear star formation activity, including starburst regions
located near each end of its strong bar, both of which host ultraluminous X-ray
sources (ULXs). With the new high-spatial-resolution Chandra imaging, we show
for the first time that NGC1672 possesses a faint ($L(X)~10^39 erg/s), hard
central X-ray source surrounded by an X-ray bright circumnuclear starburst ring
that dominates the X-ray emission in the region. The central source may
represent low-level AGN activity, or alternatively the emission from X-ray
binaries associated with star-formation in the nucleus.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:23:44 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Jenkins",
"L. P.",
""
],
[
"Brandt",
"W. N.",
""
],
[
"Colbert",
"E. J. M.",
""
],
[
"Levan",
"A. J.",
""
],
[
"Roberts",
"T. P.",
""
],
[
"Ward",
"M. J.",
""
],
[
"Zezas",
"A.",
""
]
] | [
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] |
801.2357 | Rui Qiao | R. Qiao, P. He | Mapping of dissipative particle dynamics in fluctuating hydrodynamics
simulations | null | J. Chem. Phys., 128, 126101, 2008 | 10.1063/1.2897991 | null | physics.chem-ph | null | Dissipative particle dynamics (DPD) is a novel particle method for mesoscale
modeling of complex fluids. DPD particles are often thought to represent
packets of real atoms, and the physical scale probed in DPD models are
determined by the mapping of DPD variables to the corresponding physical
quantities. However, the non-uniqueness of such mapping has led to difficulties
in setting up simulations to mimic real systems and in interpreting results.
For modeling transport phenomena where thermal fluctuations are important
(e.g., fluctuating hydrodynamics), an area particularly suited for DPD method,
we propose that DPD fluid particles should be viewed as only 1) to provide a
medium in which the momentum and energy are transferred according to the
hydrodynamic laws and 2) to provide objects immersed in the DPD fluids the
proper random "kicks" such that these objects exhibit correct fluctuation
behaviors at the macroscopic scale. We show that, in such a case, the choice of
system temperature and mapping of DPD scales to physical scales are uniquely
determined by the level of coarse-graining and properties of DPD fluids. We
also verified that DPD simulation can reproduce the macroscopic effects of
thermal fluctuation in particulate suspension by showing that the Brownian
diffusion of solid particles can be computed in DPD simulations with good
accuracy.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 19:06:07 GMT"
}
] | 2016-10-18T00:00:00 | [
[
"Qiao",
"R.",
""
],
[
"He",
"P.",
""
]
] | [
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] |
801.2358 | Felipe Rosa | F.S.S. Rosa, T.N.C. Mendes, A. Tenorio, C. Farina | Spontaneous emission of an atom near a wedge | 10 pages, version replaced to match the published one | Phys. Rev. A 78 012105 (2008) | 10.1103/PhysRevA.78.012105 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is a well known fact that non-trivial boundary conditions affect the
interaction between atoms and the always present quantized electromagnetic
field. In this paper, we focus on how the spontaneous emission rate of a given
excited atom is altered when placed inside a perfectly conducting wedge. We
begin by briefly presenting the formalism on which our calculations are
founded, proceeding then to a long but straightforward calculation of the
transition rate. We present results for a general atom but, for the sake of
simplicity, we narrow them down to an effective two-level system in our
numerical investigations. From these we conclude that the results are
physically sound.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:46:04 GMT"
},
{
"version": "v2",
"created": "Wed, 26 May 2010 22:52:48 GMT"
}
] | 2010-05-28T00:00:00 | [
[
"Rosa",
"F. S. S.",
""
],
[
"Mendes",
"T. N. C.",
""
],
[
"Tenorio",
"A.",
""
],
[
"Farina",
"C.",
""
]
] | [
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] |
801.2359 | Andreas Johansson | Marcus Rinki\"o (1), Andreas Johansson (1), Marina Y. Zavodchikova (1
and 2), J. Jussi Toppari (1), Albert G. Nasibulin (2), Esko I. Kauppinen (2)
and P\"aivi T\"orm\"a (1 and 2) ((1) University of Jyv\"askyl\"a, Finland,
(2) Helsinki University of Technology, Finland) | High-Yield of Memory Elements from Carbon Nanotube Field-Effect
Transistors with Atomic Layer Deposited Gate Dielectric | 6 pages, 3 figures; added one reference, text reformatted with
smaller additions | null | 10.1088/1367-2630/10/10/103019 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Carbon nanotube field-effect transistors (CNT FETs) have been proposed as
possible building blocks for future nano-electronics. But a challenge with CNT
FETs is that they appear to randomly display varying amounts of hysteresis in
their transfer characteristics. The hysteresis is often attributed to charge
trapping in the dielectric layer between the nanotube and the gate. This study
includes 94 CNT FET samples, providing an unprecedented basis for statistics on
the hysteresis seen in five different CNT-gate configurations. We find that the
memory effect can be controlled by carefully designing the gate dielectric in
nm-thin layers. By using atomic layer depositions (ALD) of HfO$_{2}$ and
TiO$_{2}$ in a triple-layer configuration, we achieve the first CNT FETs with
consistent and narrowly distributed memory effects in their transfer
characteristics.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:46:29 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 13:33:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rinkiö",
"Marcus",
"",
"1\n and 2"
],
[
"Johansson",
"Andreas",
"",
"1\n and 2"
],
[
"Zavodchikova",
"Marina Y.",
"",
"1\n and 2"
],
[
"Toppari",
"J. Jussi",
"",
"1 and 2"
],
[
"Nasibulin",
"Albert G.",
"",
"1 and 2"
],
[
"Kauppinen",
"Esko I.",
"",
"1 and 2"
],
[
"Törmä",
"Päivi",
"",
"1 and 2"
]
] | [
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] |
801.236 | Bei Zeng | Xie Chen, Hyeyoun Chung, Andrew W. Cross, Bei Zeng, Isaac L. Chuang | Subsystem stabilizer codes cannot have a universal set of transversal
gates for even one encoded qudit | 16 pages, 3 figures | Phys. Rev. A 78, 012353 (2008) | 10.1103/PhysRevA.78.012353 | null | quant-ph | null | A long-standing open problem in fault-tolerant quantum computation has been
to find a universal set of transversal gates. As three of us proved in arXiv:
0706.1382, such a set does not exist for binary stabilizer codes. Here we
generalize our work to show that for subsystem stabilizer codes in $d$
dimensional Hilbert space, such a universal set of transversal gates cannot
exist for even one encoded qudit, for any dimension $d$, prime or nonprime.
This result strongly supports the idea that other primitives, such as quantum
teleportation, are necessary for universal fault-tolerant quantum computation,
and may be an important factor for fault tolerance noise thresholds.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:47:48 GMT"
}
] | 2011-03-18T00:00:00 | [
[
"Chen",
"Xie",
""
],
[
"Chung",
"Hyeyoun",
""
],
[
"Cross",
"Andrew W.",
""
],
[
"Zeng",
"Bei",
""
],
[
"Chuang",
"Isaac L.",
""
]
] | [
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] |
801.2361 | Seung Woo Ham | S. W. Ham, Taeil Hur, P. Ko, and S.K. OH | Neutral scalar Higgs bosons in the USSM at the LHC | 18 pages; changed content; JPhysG | J.Phys.G35:095007,2008 | 10.1088/0954-3899/35/9/095007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of discovering neutral scalar Higgs bosons in the
$U(1)'$-extended supersymmetric standard model (USSM) at the CERN Large Hadron
Collider (LHC), by examining their productions via the exotic quark loop in the
gluon fusion process at leading order. It is possible in some parameter region
that the neutral scalar Higgs bosons may have stronger couplings with the
exotic quarks than with top quark. In this case, the exotic quarks may
contribute more significantly than top quark in productions of the neutral
scalar Higgs bosons in the gluon fusion process. We find that there is indeed
some parameter region in the USSM that supports our speculations.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:55:31 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Mar 2008 02:12:27 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Jul 2008 00:07:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ham",
"S. W.",
""
],
[
"Hur",
"Taeil",
""
],
[
"Ko",
"P.",
""
],
[
"OH",
"S. K.",
""
]
] | [
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] |
801.2362 | Alexander Zykov | G. M. Makhviladze, S. E. Yakush, A.P. Zykov | Numeric modeling of fire suppression by organophosphorous inhibitors | 18 pages, 9 figures | null | null | null | physics.chem-ph | null | Numerical calculations of the effect of organophosphorous inhibitor
(CF3CH2O)3P and its mixtures with carbon dioxide on propane flames are carried
out using the three dimensional Reynolds-averaged Navier-Stokes (RANS)
equations in the low Mach number approximation. The k-e model of turbulence,
the EDC combustion model and the weighted-sum-of-gray-gases model of radiation
are used. The Westbrook global-kinetic scheme with fractional order of reaction
was used for the calculation of chemical reaction rate of propane combustion.
The empirical expression for the correction factor for the chemical reaction
rate was used to model the effect of organophosphorous inhibitor no the
reaction. Two series of test calculations for different values of the
correction factor are carried out. Dependences of the minimum extinguishing
concentration of the inhibitor per carbon dioxide volume concentration in the
extinguishing mixtures were obtained. The results of test calculations are
shown to agree reasonably with the experimental data. A calculation of the
compartment fire extinguishment was carried out using the result of test
calculations. Temperature and inhibitor volume concentration fields at the
moment of fire extinguishment are obtained. The results of calculation are used
to find out the optimum position of the extinguish mixture source.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 18:56:03 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Makhviladze",
"G. M.",
""
],
[
"Yakush",
"S. E.",
""
],
[
"Zykov",
"A. P.",
""
]
] | [
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] |
801.2363 | Mairbek Chshiev | C. A. Culbert, M. Williams, M. Chshiev and W. H. Butler | Half-Metallic L2$_1$ Structures with (001) Planar Insertions | 9 pages, 4 figures, to appear in J. of Appl. Phys. vol. 103, issue 7
(2008) | J. Appl. Phys. 103, 07D707 (2008) | 10.1063/1.2833303 | null | cond-mat.mtrl-sci | null | A number of L2$_1$ phase alloys (composition X$_2$YZ) are half-metallic.
Although this structure is typically described in terms of an fcc Bravais
lattice with a 4 atom basis, it can be viewed more simply as a variant of bcc
or B2 in which planes of X$_2$ alternate with planes of YZ along the 001
direction. Using ab-initio electronic structure calculations, we have
investigated planar insertions along 001 into the L2$_1$ structure. For most
scenarios, insertion of single or double atomic layers of Cr into Co$_2$MnGe or
Co$_2$MnSi did not destroy the half-metallic property. One insertion of a Cr
layer into Co$_2$MnGe was observed to increase the gap. In fact, we observed
that for a large number of insertions using various transition metals or
combinations of transition metals and non-transition metals, the band gap in
the minority channel at the Fermi energy remains. An ad hoc rule that seems to
partially capture the tendency to form half-metals can be formulated as: "001
planar insertions that can plausibly yield 8 down spin electrons on the X$_2$
layer and 4 down spin electrons on the YZ layer yield half-metals".
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 19:24:04 GMT"
}
] | 2010-11-29T00:00:00 | [
[
"Culbert",
"C. A.",
""
],
[
"Williams",
"M.",
""
],
[
"Chshiev",
"M.",
""
],
[
"Butler",
"W. H.",
""
]
] | [
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] |
801.2364 | Georgios Kavoulakis | K. Karkkainen, A. D. Jackson, G. M. Kavoulakis | Bright solitary waves in a Bose-Einstein condensate and their
interactions | 6 pages, 14 figures | Phys. Rev. A 78 (2008) 033610 | null | null | cond-mat.other | null | We examine the dynamics of two bright solitary waves with a negative
nonlinear term. The observed repulsion between two solitary waves -- when these
are in an antisymmetric combination -- is attributed to conservation laws.
Slight breaking of parity, in combination with weak relaxation of energy, leads
the two solitary waves to merge. The effective repulsion between solitary waves
requires certain nearly ideal conditions and is thus fragile.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 19:08:43 GMT"
}
] | 2008-09-16T00:00:00 | [
[
"Karkkainen",
"K.",
""
],
[
"Jackson",
"A. D.",
""
],
[
"Kavoulakis",
"G. M.",
""
]
] | [
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] |
801.2365 | Cristian Marchioli Dr. | C. Marchioli, M.V. Salvetti and A. Soldati | Some issues concerning Large-Eddy Simulation of inertial particle
dispersion in turbulent bounded flows | null | null | 10.1063/1.2911018 | null | physics.flu-dyn | null | The problem of an accurate Eulerian-Lagrangian modeling of inertial particle
dispersion in Large Eddy Simulation (LES) of turbulent wall-bounded flows is
addressed. We run Direct Numerical Simulation (DNS) for turbulent channel flow
at shear Reynolds numbers equal to 150 and 300 and corresponding a-priori and
a-posteriori LES on differently coarse grids. We then tracked swarms of
different inertia particles and we examined the influence of filtering and of
Sub-Grid Scale (SGS) modeling for the fluid phase on particle velocity and
concentration statistics. We also focused on how particle preferential
segregation is predicted by LES. Results show that even ``well-resolved'' LES
is unable to reproduce the physics as demonstrated by DNS, both for particle
accumulation at the wall and for particle preferential segregation. Inaccurate
prediction is observed for the entire range of particles considered in this
study, even when the particle response time is much larger than the flow
timescales not resolved in LES. Both a-priori and a-posteriori tests indicate
that recovering the level of fluid and particle velocity fluctuations is not
enough to have accurate prediction of near-wall accumulation and local
segregation. This may suggest that reintroducing the correct amount of
higher-order moments of the velocity fluctuations is also a key point for SGS
closure models for the particle equation. Another important issue is the
presence of possible flow Reynolds number effects on particle dispersion. Our
results show that, in small Reynolds number turbulence and in the case of heavy
particles, the shear fluid velocity is a suitable scaling parameter to quantify
these effects.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 19:09:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marchioli",
"C.",
""
],
[
"Salvetti",
"M. V.",
""
],
[
"Soldati",
"A.",
""
]
] | [
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] |
801.2366 | Stephen Dye | Stephen T. Dye and Eugene H. Guillian | Estimating terrestrial uranium and thorium by antineutrino flux
measurements | 15 pages, 2 figures | PNAS 105 (2008) 44-47 | 10.1073/pnas.0706541105 | null | physics.geo-ph | null | Uranium and thorium within the Earth produce a major portion of terrestrial
heat along with a measurable flux of electron antineutrinos. These elements are
key components in geophysical and geochemical models. Their quantity and
distribution drive the dynamics, define the thermal history, and are a
consequence of the differentiation of the Earth. Knowledge of uranium and
thorium concentrations in geological reservoirs relies largely on geochemical
model calculations. This research report describes the methods and criteria to
experimentally determine average concentrations of uranium and thorium in the
continental crust and in the mantle using site-specific measurements of the
terrestrial antineutrino flux. Optimal, model-independent determinations
involve significant exposures of antineutrino detectors remote from nuclear
reactors at both a mid-continental and a mid-oceanic site. This would require
major, new antineutrino detection projects. The results of such projects could
yield a greatly improved understanding of the deep interior of the Earth.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 19:14:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dye",
"Stephen T.",
""
],
[
"Guillian",
"Eugene H.",
""
]
] | [
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] |
801.2367 | Guillermo Raul Zemba | Federico L. Bottesi, Guillermo R. Zemba | Effective Field Theories for Electrons in Crystalline Structures | 24 pages, 3 figures | J.Stat.Mech.0807:P07001,2008 | 10.1088/1742-5468/2008/07/P07001 | null | cond-mat.mes-hall astro-ph cond-mat.other cond-mat.str-el hep-th | null | We present an effective field theory formulation for a class of condensed
matter systems with crystalline structures for which some of the discrete
symmetries of the underlying crystal survive the long distance limit, up to
mesoscopic scales, and argue that this class includes interesting materials,
such as $Si$-doped $GaAs$. The surviving symmetries determine a limited set of
possible effective interactions, that we analyze in detail for the case of
$Si$-doped $GaAs$ materials. These coincide with the ones proposed in the
literature to describe the spin relaxation times for the $Si$-doped $Ga As$
materials, obtained here as a consequence of the choice of effective fields and
their symmetries. The resulting low-energy effective theory is described in
terms of three (six chiral) one-dimensional Luttinger liquid systems and their
corresponding intervalley transitions. We also discuss the Mott transition
within the context of the effective theory.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 19:22:59 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 17:21:47 GMT"
},
{
"version": "v3",
"created": "Mon, 7 Apr 2008 22:28:19 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Bottesi",
"Federico L.",
""
],
[
"Zemba",
"Guillermo R.",
""
]
] | [
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] |
801.2368 | James Worthington | James Worthington | Feasibly Reducing KAT Equations to KA Equations | null | null | null | null | math.LO | null | Kleene algebra (KA) is the algebra of regular events. Familiar examples of
Kleene algebras include regular sets, relational algebras, and trace algebras.
A Kleene algebra with tests (KAT) is a Kleene algebra with an embedded Boolean
subalgebra. The addition of tests allows one to encode {\tt while} programs as
KAT terms, thus the equational theory of KAT can express (propositional)
program equivalence. More complicated statements about programs can be
expressed in the Hoare theory of KAT, which suffices to encode Propositional
Hoare Logic.
That the equational theory of KAT reduces to the equational theory of KA has
been shown by Cohen et al. Unfortunately, their reduction involves an
exponential blowup in the size of the terms involved. Here we give an alternate
feasible reduction.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 19:50:23 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Worthington",
"James",
""
]
] | [
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801.2369 | Mircea Neagu | Mircea Neagu | Jet Geometrical Objects Depending on a Relativistic Time | 19 pages; The author thanks the referee of Analele Stiintifice ale
Universitatii "Al.I.Cuza" din Iasi. Matematica for its remarks and useful
suggestions | Analele Stiintifice ale Universitatii "Al.I. Cuza" din Iasi
(S.N.). Matematica, Tomul LVI, f.2 (2010), 407-428 | 10.2478/v10157-010-0029-1 | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study a collection of jet geometrical concepts, we refer to
d-tensors, relativistic time dependent semisprays, harmonic curves and
nonlinear connections on the 1-jet space J1(R;M), necessary to the construction
of a Miron's-like geometrization for Lagrangians depending on a relativistic
time. The geometrical relations between these jet geometrical objects are
exposed.
| [
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"created": "Tue, 15 Jan 2008 19:54:12 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Jul 2009 14:58:20 GMT"
}
] | 2010-09-14T00:00:00 | [
[
"Neagu",
"Mircea",
""
]
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801.237 | Nathan Ilten | Nathan Ilten | One-Parameter Toric Deformations of Cyclic Quotient Singularities | 18 pages, 3 figures; v2 minor revisions; v3 strengthened main theorem | Journal of Pure and Applied Algebra, Volume 213 (2009), pp.
1086-1096 | 10.1016/j.jpaa.2008.11.010 | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the case of two-dimensional cyclic quotient singularities, we classify all
one-parameter toric deformations in terms of certain Minkowski decompositions.
In particular, we describe to which components each such deformation maps, show
how to induce each deformation from a versal family, give explicit equations
for each deformation, describe the singularities in the general fibers, and
construct the corresponding partial simultaneous resolutions.
| [
{
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"created": "Tue, 15 Jan 2008 20:57:59 GMT"
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{
"version": "v2",
"created": "Tue, 10 Jun 2008 09:43:26 GMT"
},
{
"version": "v3",
"created": "Fri, 17 Oct 2008 15:36:40 GMT"
}
] | 2009-02-25T00:00:00 | [
[
"Ilten",
"Nathan",
""
]
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] |
801.2371 | Bertrand Goldman | B. Goldman (NMSU, MPIA), M. C. Cushing (UA), M. S. Marley (Ames), \'E.
Artigau (Gemini), K. S. Baliyan (PRL), V. J. S. B\'ejar (IAC), J. A.
Caballero (MPIA, IAC), N. Chanover (NMSU), M. Connelley (IfA), R. Doyon
(Montr\'eal), T. Forveille (CFHT, Grenoble), S. Ganesh (PRL), C. R. Gelino
(NMSU, Spitzer), H. B. Hammel (SSI), J. Holtzman (NMSU), S. Joshi (ARIES), U.
C. Joshi (PRL), S. K. Leggett (JAC), M. C. Liu (IfA), E. L. Mart\'in (IAC),
V. Mohan (IUCAA), D. Nadeau (Montr\'eal), R. Sagar (AIRES) and D. Stephens
(BYU) (for the CLOUDS Collaboration) | CLOUDS search for variability in brown dwarf atmospheres | 17 pages, 14 figures, accepted by A&A | null | 10.1051/0004-6361:20065075 | null | astro-ph | null | Context: L-type ultra-cool dwarfs and brown dwarfs have cloudy atmospheres
that could host weather-like phenomena. The detection of photometric or
spectral variability would provide insight into unresolved atmospheric
heterogeneities, such as holes in a global cloud deck.
Aims: It has been proposed that growth of heterogeneities in the global cloud
deck may account for the L- to T-type transition as brown dwarf photospheres
evolve from cloudy to clear conditions. Such a mechanism is compatible with
variability. We searched for variability in the spectra of five L6 to T6 brown
dwarfs in order to test this hypothesis.
Methods: We obtained spectroscopic time series using VLT/ISAAC, over
0.99-1.13um, and IRTF/SpeX for two of our targets, in J, H and K bands. We
search for statistically variable lines and correlation between those.
Results: High spectral-frequency variations are seen in some objects, but
these detections are marginal and need to be confirmed. We find no evidence for
large amplitude variations in spectral morphology and we place firm upper
limits of 2 to 3% on broad-band variability, on the time scale of a few hours.
The T2 transition brown dwarf SDSS J1254-0122 shows numerous variable features,
but a secure variability diagnosis would require further observations.
Conclusions: Assuming that any variability arises from the rotation of
patterns of large-scale clear and cloudy regions across the surface, we find
that the typical physical scale of cloud cover disruption should be smaller
than 5-8% of the disk area for four of our targets. The possible variations
seen in SDSS J1254-0122 are not strong enough to allow us to confirm the cloud
breaking hypothesis.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 20:29:08 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Goldman",
"B.",
"",
"NMSU, MPIA"
],
[
"Cushing",
"M. C.",
"",
"UA"
],
[
"Marley",
"M. S.",
"",
"Ames"
],
[
"Artigau",
"É.",
"",
"Gemini"
],
[
"Baliyan",
"K. S.",
"",
"PRL"
],
[
"Béjar",
"V. J. S.",
"",
"IAC"
],
[
"Caballero",
"J. A.",
"",
"MPIA, IAC"
],
[
"Chanover",
"N.",
"",
"NMSU"
],
[
"Connelley",
"M.",
"",
"IfA"
],
[
"Doyon",
"R.",
"",
"Montréal"
],
[
"Forveille",
"T.",
"",
"CFHT, Grenoble"
],
[
"Ganesh",
"S.",
"",
"PRL"
],
[
"Gelino",
"C. R.",
"",
"NMSU, Spitzer"
],
[
"Hammel",
"H. B.",
"",
"SSI"
],
[
"Holtzman",
"J.",
"",
"NMSU"
],
[
"Joshi",
"S.",
"",
"ARIES"
],
[
"Joshi",
"U. C.",
"",
"PRL"
],
[
"Leggett",
"S. K.",
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801.2372 | Marcelo Salgado | Marcelo Salgado, David Martinez-del Rio, Miguel Alcubierre, Dario
N\'u\~nez | Hyperbolicity of scalar-tensor theories of gravity | 15 pages two-column RevTex; minor corrections: references added,
comments added, typos corrected; accepted for publication in Phys. Rev. D | Phys.Rev.D77:104010,2008 | 10.1103/PhysRevD.77.104010 | null | gr-qc astro-ph hep-th math-ph math.MP | null | Two first order strongly hyperbolic formulations of scalar-tensor theories of
gravity (STT) allowing nonminimal couplings (Jordan frame) are presented along
the lines of the 3+1 decomposition of spacetime. One is based on the Bona-Masso
formulation while the other one employs a conformal decomposition similar to
that of Baumgarte-Shapiro-Shibata-Nakamura. A modified Bona-Masso slicing
condition adapted to the scalar-tensor theory is proposed for the analysis.
This study confirms that the scalar-tensor theory posses a well posed Cauchy
problem even when formulated in the Jordan frame.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 20:41:21 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Apr 2008 22:01:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Salgado",
"Marcelo",
""
],
[
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"David Martinez-del",
""
],
[
"Alcubierre",
"Miguel",
""
],
[
"Núñez",
"Dario",
""
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