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801.3073 | Youngchul Sung | Youngchul Sung, H. Vincent Poor and Heejung Yu | Large Deviations Analysis for the Detection of 2D Hidden Gauss-Markov
Random Fields Using Sensor Networks | To appear in the Proceedings of the 2008 IEEE International
Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March
30 - April 4, 2008 | null | 10.1109/ICASSP.2008.4518504 | null | cs.IT math.IT | null | The detection of hidden two-dimensional Gauss-Markov random fields using
sensor networks is considered. Under a conditional autoregressive model, the
error exponent for the Neyman-Pearson detector satisfying a fixed level
constraint is obtained using the large deviations principle. For a symmetric
first order autoregressive model, the error exponent is given explicitly in
terms of the SNR and an edge dependence factor (field correlation). The
behavior of the error exponent as a function of correlation strength is seen to
divide into two regions depending on the value of the SNR. At high SNR,
uncorrelated observations maximize the error exponent for a given SNR, whereas
there is non-zero optimal correlation at low SNR. Based on the error exponent,
the energy efficiency (defined as the ratio of the total information gathered
to the total energy required) of ad hoc sensor network for detection is
examined for two sensor deployment models: an infinite area model and and
infinite density model. For a fixed sensor density, the energy efficiency
diminishes to zero at rate O(area^{-1/2}) as the area is increased. On the
other hand, non-zero efficiency is possible for increasing density depending on
the behavior of the physical correlation as a function of the link length.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 10:04:16 GMT"
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] | 2016-11-15T00:00:00 | [
[
"Sung",
"Youngchul",
""
],
[
"Poor",
"H. Vincent",
""
],
[
"Yu",
"Heejung",
""
]
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801.3074 | Vladimir Popov L | Vladimir L. Popov | Irregular and singular loci of commuting varieties | 15 pages Several minor corrections are implemented | Transformation Groups, Vol. 13 (2008), Nos. 3--4, 819--837. | null | null | math.AG math.GR math.RT | null | We prove that the singular locus of the commuting variety of a noncommutative
reductive Lie algebra is contained in the irregular locus and we compute the
codimension of the latter. We prove that one of the irreducible components of
the irregular locus has codimension 4. This yields the lower bound of the
codimension of the singular locus, in particular, implies that it is at least
2. We also prove that the commuting variety is rational.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 10:03:44 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Apr 2008 11:58:38 GMT"
}
] | 2009-10-05T00:00:00 | [
[
"Popov",
"Vladimir L.",
""
]
] | [
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801.3075 | Guillermo Hagele | Angeles I. Diaz (1), Elena Terlevich (2), Guillermo F. Hagele (1),
Marcelo Castellanos (1) ((1)Departamento de Fisica Teorica, Universidad
Autonoma de Madrid, Spain (2)Instituto Nacional de Astrofisica, Optica y
Electronica, Puebla, Mexico) | Circumnuclear Regions of Star Formation in Early Type Galaxies | 4 pages, 2 figures, proceeding of the meeting "Pathways Through an
Eclectic Universe", Tenerife, 2007 | null | null | null | astro-ph | null | Circumnuclear star forming regions, also called hotspots, are often found in
the inner regions of some spiral galaxies where intense processes of star
formation are taking place. In the UV, massive stars dominate the observed
circumnuclear emission even in the presence of an active nucleus, contributing
between 30 and 50% to the H$\beta$ total emission of the nuclear zone.
Spectrophotometric data of moderate resolution (3000 < R < 11000) are
presented from which the physical properties of the ionized gas: electron
density, oxygen abundances, ionization structure etc. have been derived.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 10:43:43 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Diaz",
"Angeles I.",
""
],
[
"Terlevich",
"Elena",
""
],
[
"Hagele",
"Guillermo F.",
""
],
[
"Castellanos",
"Marcelo",
""
]
] | [
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801.3076 | Pietro Antonio Grassi | Pietro Fr\'e and Pietro Antonio Grassi | Free Differential Algebras, Rheonomy, and Pure Spinors | Talk given by Pietro Fr\'e at the Workshop Supersymmetry and Quantum
Symmetry 2007 held at the Joint Institute for Nuclear Research in Dubna
(Russian Federation), July 2007, 15 pp, Latex, 2 figures | null | null | DISTA-2008 | hep-th | null | We report on progresses on the derivation of pure spinor constraints, BRST
algebra and BRST invariant sigma models a la pure spinors from the algebraic
structure of the FDA underlying supergravity.
| [
{
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] | 2008-01-22T00:00:00 | [
[
"Fré",
"Pietro",
""
],
[
"Grassi",
"Pietro Antonio",
""
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801.3077 | R. B. Metcalf | R. Benton Metcalf | Gravitational Lensing of Pregalactic 21 cm Radiation | prize wining contribution to proceedings of the Cosmology 2007
conference in Venice, 4 pages, one color figure | Nuovo Cim.B122:1453-1457,2007 | 10.1393/ncb/i2008-10487-8 | null | astro-ph | null | Low-frequency radio observations of neutral hydrogen during and before the
epoch of cosmic reionization will provide hundreds of quasi-independent source
planes, each of precisely known redshift, if a resolution of ~ 1 arcminutes or
better can be attained. These planes can be used to reconstruct the projected
mass distribution of foreground material. A wide-area survey of 21 cm lensing
would provide very sensitive constraints on cosmological parameters, in
particular on dark energy. These are up to 20 times tighter than the
constraints obtainable from comparably sized, very deep surveys of galaxy
lensing although the best constraints come from combining data of the two
types. Any radio telescope capable of mapping the 21cm brightness temperature
with good frequency resolution (~ 0.05 MHz) over a band of width ~> 10 MHz
should be able to make mass maps of high quality. If the reionization epoch is
at z ~ 9 very large amounts of cosmological information will be accessible. The
planned Square Kilometer Array (SKA) should be capable of mapping the mass with
a resolution of a few arcminutes depending on the reionization history of the
universe and how successfully foreground sources can be subtracted. The
Low-Frequency Array (LOFAR) will be able to measure an accurate matter power
spectrum if the same conditions are met.
| [
{
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"created": "Sun, 20 Jan 2008 10:59:36 GMT"
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] | 2010-11-11T00:00:00 | [
[
"Metcalf",
"R. Benton",
""
]
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801.3078 | Guillermo Hagele | Angeles I. Diaz (1), Guillermo F. Hagele (1), Elena Terlevich (2),
Roberto Terlevich (2) ((1)Dpto de Fisica Teorica, Universidad Autonoma de
Madrid, Spain (2)Instituto Nacional de Astrofisica, Optica y Electronica,
Mexico) | Properties of the ionized gas of circumnuclear star-forming regions in
early type spirals | 7 pages, 8 figures, proceeding of the meeting "Young massive star
clusters - Initial conditions and environments", Granada, Spain, 2007 | Astrophys.Space Sci.324:209-214,2009 | 10.1007/s10509-009-0132-5 | null | astro-ph | null | (Abbr.) A study of cicumnuclear star-forming regions (CNSFRs) in several
early type spirals has been made in order to investigate their main properties:
stellar and gas kinematics, dynamical masses, ionising stellar masses, chemical
abundances and other properties of the ionised gas. Both high resolution (R$
\sim $20000) and moderate resolution (R ~ 5000) have been used.
In some cases these regions, about 100 to 150 pc in size, are seen to be
composed of several individual star clusters with sizes between 1.5 and 4.9 pc
estimated from Hubble Space Telescope (HST) images. Stellar and gas velocity
dispersions are found to differ by about 20 to 30 km/s with the H$\beta$
emission lines being narrower than both the stellar lines and the [OIII]
$\lambda$ 5007 \AA lines. The twice ionized oxygen, on the other hand, shows
velocity dispersions comparable to those shown by stars. We have applied the
virial theorem to estimate dynamical masses of the clusters, assuming that
systems are gravitationally bounded and spherically symmetric, and using
previously measured sizes. The measured values of the stellar velocity
dispersions yield dynamical masses of the order of 10$^7$ to 10$^8$ solar
masses for the whole CNSFRs.
...
| [
{
"version": "v1",
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] | 2009-12-04T00:00:00 | [
[
"Diaz",
"Angeles I.",
""
],
[
"Hagele",
"Guillermo F.",
""
],
[
"Terlevich",
"Elena",
""
],
[
"Terlevich",
"Roberto",
""
]
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] |
801.3079 | Mikhail Ignatyev V. | Mikhail V. Ignatyev | Subregular characters of the unitriangular group over a finite field | 18 pages | J. Math. Sci., 156 (2009), no. 2, 276-291 | null | null | math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an explicit formula for subregular characters (i.e, irreducible
finite-dimensional complex characters of submaximal degree) of the
unitriangular group over a finite field of sufficiently large characteristic.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 11:12:21 GMT"
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{
"version": "v2",
"created": "Tue, 22 Jan 2008 07:04:43 GMT"
},
{
"version": "v3",
"created": "Wed, 7 Dec 2011 16:51:02 GMT"
}
] | 2013-10-15T00:00:00 | [
[
"Ignatyev",
"Mikhail V.",
""
]
] | [
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801.308 | Masato Minamitsuji | Masato Minamitsuji | Instability of brane cosmological solutions with flux compactifications | 11 pages, 3 figures, references added, to appear in CQG | Class.Quant.Grav.25:075019,2008 | 10.1088/0264-9381/25/7/075019 | null | hep-th astro-ph gr-qc | null | We discuss the stability of the higher-dimensional de Sitter (dS) brane
solutions with two-dimensional internal space in the Einstein-Maxwel theory. We
show that an instability appears in the scalar-type perturbations with respect
to the dS spacetime. We derive a differential relation which has the very
similar structure to the ordinary laws of thermodynamics as an extension of the
work for the six-dimensional model [20]. In this relation, the area of dS
horizon (integrated over the two internal dimensions) exactly behaves as the
thermodynamical entropy. The dynamically unstable solutions are in the
thermodynamically unstable branch. An unstable dS compactification either
evolves toward a stable configuration or two-dimensional internal space is
decompactified. These dS brane solutions are equivalent to the accelerating
cosmological solutions in the six-dimensional Einstein-Maxwell-dilaton theory
via dimensional reduction. Thus, if the seed higher-dimensional solution is
unstable, the corresponding six-dimensional solution is also unstable. From the
effective four-dimensional point of view, a cosmological evolution from an
unstable cosmological solution in higher dimensions may be seen as a process of
the transition from the initial cosmological inflation to the current dark
energy dominated Universe.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 11:18:55 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 18:09:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Minamitsuji",
"Masato",
""
]
] | [
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801.3081 | Guillermo Hagele | Guillermo F. Hagele (1), Angeles I. Diaz (1), Monica V. Cardaci (1,2),
Elena Terlevich (3), Roberto Terlevich (3) ((1)Dpto de Fisica Teorica,
Universidad Autonoma de Madrid, Spain (2)XMM-Newton Science Operations
Center, ESAC, ESA, Madrid, Spain (3)Instituto Nacional de Astrofisica, Optica
y Electronica, Mexico) | Kinematics of gas and stars in circumnuclear star-forming regions of
early type spirals | 4 pages, proceeding of the meeting "Young massive star clusters -
Initial conditions and environments", Granada, Spain, 2007 | Astrophys.Space Sci.324:341-342,2009 | 10.1007/s10509-009-0091-x | null | astro-ph | null | (Abbr.) We present high resolution (R~20000) spectra in the blue and the far
red of cicumnuclear star-forming regions (CNSFRs) in three early type spirals
(NGC3351, NGC2903 and NGC3310) which have allowed the study of the kinematics
of stars and ionized gas in these structures and, for the first time, the
derivation of their dynamical masses for the first two. In some cases these
regions, about 100 to 150 pc in size, are seen to be composed of several
individual star clusters with sizes between 1.5 and 4.9 pc estimated from
Hubble Space Telescope (HST) images. The stellar dispersions have been obtained
from the Calcium triplet (CaT) lines at $\lambda\lambda$ 8494,8542,8662 \AA,
while the gas velocity dispersions have been measured by Gaussian fits to the
H$\beta$ and [OIII] $\lambda\lambda$ 5007 \AA lines on the high dispersion
spectra. Values of the stellar velocity dispersions are between 30 and 68 km/s.
We apply the virial theorem to estimate dynamical masses of the clusters,
assuming that systems are gravitationally bounded and spherically symmetric,
and using previously measured sizes. The measured values of the stellar
velocity dispersions yield dynamical masses of the order of 10$^7$ to 10$^8$
solar masses for the whole CNSFRs. Stellar and gas velocity dispersions are
found to differ by about 20 to 30 km/s with the H$\beta$ emission lines being
narrower than both the stellar lines and the [OIII] $\lambda\lambda$ 5007 \AA
lines. The twice ionized oxygen, on the other hand, shows velocity dispersions
comparable to those shown by stars, in some cases, even larger. We have found
indications of the presence of two different kinematical components in the
ionized gas of the regions...
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 11:24:33 GMT"
}
] | 2009-12-04T00:00:00 | [
[
"Hagele",
"Guillermo F.",
""
],
[
"Diaz",
"Angeles I.",
""
],
[
"Cardaci",
"Monica V.",
""
],
[
"Terlevich",
"Elena",
""
],
[
"Terlevich",
"Roberto",
""
]
] | [
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] |
801.3082 | Satoru Terashima | S. Terashima, H. Sakaguchi, H. Takeda, T. Ishikawa, M. Itoh, T.
Kawabata, T. Murakami, M. Uchida, Y. Yasuda, M. Yosoi, J. Zenihiro, H. P.
Yoshida, T. Noro, T. Ishida, S. Asaji, and T. Yonemura | Proton elastic scattering from tin isotopes at 295 MeV and systematic
change of neutron density distributions | 24 pages, 12 figures. Accepted for publication in Physical Review C | Phys. Rev. C 77, 024317 (2008) | 10.1103/PhysRevC.77.024317 | null | nucl-ex | null | Cross sections and analyzing powers for proton elastic scattering from
$^{116,118,120,122,124}$Sn at 295 MeV have been measured for a momentum
transfer of up to about 3.5 fm$^{-1}$ to deduce systematic changes of the
neutron density distribution. We tuned the relativistic Love-Franey interaction
to explain the proton elastic scattering of a nucleus whose density
distribution is well known. Then, we applied this interaction to deduce the
neutron density distributions of tin isotopes. The result of our analysis shows
the clear systematic behavior of a gradual increase in the neutron skin
thickness of tin isotopes with mass number.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 11:46:21 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Feb 2008 10:14:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Terashima",
"S.",
""
],
[
"Sakaguchi",
"H.",
""
],
[
"Takeda",
"H.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Itoh",
"M.",
""
],
[
"Kawabata",
"T.",
""
],
[
"Murakami",
"T.",
""
],
[
"Uchida",
"M.",
""
],
[
"Yasuda",
"Y.",
""
],
[
"Yosoi",
"M.",
""
],
[
"Zenihiro",
"J.",
""
],
[
"Yoshida",
"H. P.",
""
],
[
"Noro",
"T.",
""
],
[
"Ishida",
"T.",
""
],
[
"Asaji",
"S.",
""
],
[
"Yonemura",
"T.",
""
]
] | [
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] |
801.3083 | Richard A. Blythe | G. J. Baxter, R. A. Blythe and A. J. McKane | Fixation and consensus times on a network: a unified approach | 4+epsilon pages, two-column, RevTeX4, 3 eps figures; version accepted
by Phys. Rev. Lett | Phys. Rev. Lett. 101, 258701 (2008) | 10.1103/PhysRevLett.101.258701 | null | cond-mat.stat-mech physics.soc-ph q-bio.QM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a set of stochastic models of biodiversity, population
genetics, language evolution and opinion dynamics on a network within a common
framework. Each node has a state, 0 < x_i < 1, with interactions specified by
strengths m_{ij}. For any set of m_{ij} we derive an approximate expression for
the mean time to reach fixation or consensus (all x_i=0 or 1). Remarkably in a
case relevant to language change this time is independent of the network
structure.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 11:50:39 GMT"
},
{
"version": "v2",
"created": "Mon, 5 Jan 2009 15:35:40 GMT"
}
] | 2009-01-05T00:00:00 | [
[
"Baxter",
"G. J.",
""
],
[
"Blythe",
"R. A.",
""
],
[
"McKane",
"A. J.",
""
]
] | [
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801.3084 | Yusuke Kato | Yusuke Kato, Hiroshi Nishiwaki, and Akitake Fujita | Mechanism of Anomalous Tunneling in Condensed Bose System | 4 pages 1 figure | J. Phys. Soc. Jpn. Vol. 77 No. 1, January, 2008, p. 013602 | 10.1143/JPSJ.77.013602 | null | cond-mat.mtrl-sci | null | We clarify the origin of anomalous tunneling [Yu. Kagan et al. Phys. Rev.
Lett. 90 (2003) 130402] i.e. the perfect transmission at low energy limit of
tunneling of phonon excitations across the potential barrier separating two
Bose condensates. The perfect transmission is a consequence of the coincidence
of the wave function of the excited state at low energy limit and the
macroscopic wave function of the condensate. We show that the perfect
transmission at low energy occurs even at finite temperatures within the scheme
of Popov approximation.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 12:36:23 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Kato",
"Yusuke",
""
],
[
"Nishiwaki",
"Hiroshi",
""
],
[
"Fujita",
"Akitake",
""
]
] | [
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801.3085 | Richard Shurtleff | Richard Shurtleff | Gravity, Cosmic Rays and the LHC | 5 pages, 1 figure, 3 problems | null | null | null | hep-ph astro-ph | null | The high energy proton beams expected when the Large Hadron Collider (LHC)
comes online should provide a pass/fail test for a gravity-related explanation
of ultrahigh energy cosmic rays. The model predicts that particles have two
kinds energies, equal for null gravitational potentials and, in the potential
at the Earth, differing significantly above one TeV. If correct, a 7 TeV
trajectory energy proton at the LHC would deliver a 23.5 TeV particle state
energy in a collision.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 12:49:14 GMT"
}
] | 2008-01-26T00:00:00 | [
[
"Shurtleff",
"Richard",
""
]
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801.3086 | Haozhao Li | Xiuxiong Chen, Haozhao Li | Stability of K\"ahler-Ricci flow | 29 pages, final version, to appear in Journal of Geometric Analysis | null | null | null | math.DG math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the convergence of K\"ahler-Ricci flow with some small initial
curvature conditions. As applications, we discuss the convergence of
K\"ahler-Ricci flow when the complex structure varies on a K\"ahler-Einstein
manifold.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 13:31:39 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 09:10:24 GMT"
},
{
"version": "v3",
"created": "Thu, 30 Jul 2009 01:42:49 GMT"
}
] | 2009-07-30T00:00:00 | [
[
"Chen",
"Xiuxiong",
""
],
[
"Li",
"Haozhao",
""
]
] | [
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0.0527542979,
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] |
801.3087 | Hiroyuki Kawamura | Hiroyuki Kawamura, Jiro Kodaira, Kazuhiro Tanaka | Soft gluon resummation in Drell-Yan dilepton production at small
transverse momentum: spin asymmetry and a novel asymptotic formula | 6 pages, 2 figures, to appear in the proceedings of RADCOR2007,
Florence, Italy, 1-5 Oct 2007 | PoSRADCOR2007:040,2007 | null | null | hep-ph | null | We discuss the double-spin asymmetry \aqt in the transversely polarized
Drell-Yan process at small transverse-momentum Q_T of the produced dilepton.
The soft gluon corrections relevant for small Q_T are resummed to all orders in
\alpha_s, up to the next-to-leading logarithmic accuracy. We show that the soft
gluon corrections largely cancel in the spin asymmetry, but the significant
corrections still remain.The asymmetries \aqt are calculated for pp collision
at RHIC and J-PARC, and for p\bar{p} collision at GSI. A novel asymptotic
formula for \aqt at small Q_T is presented, which provides a new approach to
extract the transversity \delta q(x) from the experimental data.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 03:34:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kawamura",
"Hiroyuki",
""
],
[
"Kodaira",
"Jiro",
""
],
[
"Tanaka",
"Kazuhiro",
""
]
] | [
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801.3088 | Markus Haltmeier | A. De Cezaro, M. Haltmeier, A. Leitao, O. Scherzer | On Steepest-Descent-Kaczmarz Methods for Regularizing Systems of
Nonlinear Ill-posed Equations | 22 pages (8 figures). For this version we have corrected some typos
and also have corrected Equation (25) in the proof of Theorem 3.3 | Applied Mathematics and Computation 202 (2008), pp. 596-607 | null | null | math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate modified steepest descent methods coupled with a loping
Kaczmarz strategy for obtaining stable solutions of nonlinear systems of
ill-posed operator equations. We show that the proposed method is a convergent
regularization method. Numerical tests are presented for a linear problem
related to photoacoustic tomography and a non-linear problem related to the
testing of semiconductor devices.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 15:05:48 GMT"
},
{
"version": "v2",
"created": "Sat, 1 Mar 2008 14:12:47 GMT"
},
{
"version": "v3",
"created": "Sun, 3 Aug 2008 14:30:37 GMT"
}
] | 2008-08-03T00:00:00 | [
[
"De Cezaro",
"A.",
""
],
[
"Haltmeier",
"M.",
""
],
[
"Leitao",
"A.",
""
],
[
"Scherzer",
"O.",
""
]
] | [
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] |
801.3089 | Noam Soker | Noam Soker (Technion, Israel) | A Phenomenological Model for the Extended Zone Above AGB Stars | New Astronomy, in press | New Astron.13:491-497,2008 | 10.1016/j.newast.2008.01.007 | null | astro-ph | null | I suggest the existence of an extended zone above the surface of asymptotic
giant branch (AGB), as well as similar stars experiencing high mass loss rates.
In addition to the escaping wind, in this zone there are parcels of gas that do
not reach the escape velocity. These parcels of dense gas rise slowly and then
fall back. The wind and bound gas exist simultaneously to distances of ~100AU.
I term this region the effervescent zone. In this phenomenological study I find
that the density of the bound material in the effervescent zone falls as
~r^{-5/2}, not much faster than the wind density. The main motivation to
propose the effervescent model is to allow wide binary companions to influence
the morphology of the descendant planetary nebulae (PN) by accreting mass from
the effervescent zone. Accretion from the effervescent zone is more efficient
than accretion from the wind in forming an accretion disk around the companion.
The companion might then blow two jets that will shape the descendant PN.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 14:47:27 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 08:04:04 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Soker",
"Noam",
"",
"Technion, Israel"
]
] | [
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] |
801.309 | Federico Urban | A. D. Dolgov, F. R. Urban | Dynamical vacuum energy via adjustment mechanism | 12 pages, v2 with minor grammatical changes and one reference added.
Published in PRD | Phys.Rev.D77:083503,2008 | 10.1103/PhysRevD.77.083503 | null | astro-ph gr-qc hep-ph | null | A new mechanism of adjustment of vacuum energy down to the observed value
from an initially huge one is considered. The mechanism is based on a very
strong variation of the gravitational coupling constant in very early universe.
The model predicts that the non--compensated remnant of vacuum energy changes
very slowly at late stages of the cosmological evolution and is naturally close
to the observed one. Asymptotically the effective vacuum energy tends to a
negative value, so the cosmological expansion should stop and turn into
contraction. There remains the problem of introduction of the usual matter into
the model and therefore realising realistic cosmology.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 14:51:32 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Apr 2008 12:20:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dolgov",
"A. D.",
""
],
[
"Urban",
"F. R.",
""
]
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801.3091 | Nathan Logoboy | N. A. Logoboy and E. B. Sonin | Cryptoferromagnetism in Superconductors with Broken Time-Reversal
Symmetry | 4 pages, 2 figures | Phys. Rev. B 79, 020502(R) (2009) | 10.1103/PhysRevB.79.020502 | null | cond-mat.supr-con | null | The cryptoferromagnetic state (the state with intrinsic domain structure) in
superconducting ferromagnets subjected to external magnetic field is studied
theoretically. Ferromagnetism originates either from electron spin or the
intrinsic angular momentum of Cooper pairs (chiral p-wave superconductors like
$\mathrm{Sr_2 Ru O_4}$). The phase transitions towards the Meissner and the
mixed states are investigated, and the magnetic phase diagrams are obtained.
Cryptoferromagnetism, as a form coexistence of superconductivity and
ferromagnetism, can be detected by observation of magnetization curves
predicted in the present analysis.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 15:35:58 GMT"
}
] | 2019-10-04T00:00:00 | [
[
"Logoboy",
"N. A.",
""
],
[
"Sonin",
"E. B.",
""
]
] | [
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801.3092 | Commer\c{c}on Benoit | Benoit Commercon, Patrick Hennebelle, Edouard Audit, Gilles Chabrier
and Romain Teyssier | Protostellar collapse: A comparison between SPH and AMR calculations | 16 pages, 16 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20078591 | null | astro-ph | null | The development of parallel supercomputers allows today the detailed study of
the collapse and the fragmentation of prestellar cores with increasingly
accurate numerical simulations. Thanks to the advances in sub-millimeter
observations, a wide range of observed initial conditions enable us to study
the different modes of low-mass star formation. The challenge for the
simulations is to reproduce the observational results. Two main numerical
methods, namely AMR and SPH, are widely used to simulate the collapse and the
fragmentation of prestellar cores. We compare thoroughly these two methods
within their standard framework. We use the AMR code RAMSES and the SPH code
DRAGON. Our physical model is as simple as possible and consists of an
isothermal sphere rotating around the z-axis. We first study the conservation
of angular momentum as a function of the resolution. Then, we explore a wide
range of simulation parameters to study the fragmentation of prestellar cores.
There seems to be a convergence between the two methods, provided resolution in
each case is sufficient. Resolution criteria adapted to our physical cases, in
terms of resolution per Jeans mass, for an accurate description of the
formation of protostellar cores are deduced from the present study. This
convergence is encouraging for future work in simulations of low-mass star
formation, providing the aforementioned criteria are fulfilled.
Higher resolution figures can be downloaded at
http://www-dapnia.cea.fr/Projets/COAST/paper_amrvssph.pdf
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 15:51:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Commercon",
"Benoit",
""
],
[
"Hennebelle",
"Patrick",
""
],
[
"Audit",
"Edouard",
""
],
[
"Chabrier",
"Gilles",
""
],
[
"Teyssier",
"Romain",
""
]
] | [
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] |
801.3093 | Bruce Kleiner | Bruce Kleiner, Bernhard Leeb | Induced quasi-actions: a remark | null | null | null | null | math.GR math.DG math.MG | null | In this note we observe that the notion of an induced representation has an
analog for quasi-actions. We then use induced quasi-actions to refine some
earlier rigidity results for product spaces.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 15:41:37 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Kleiner",
"Bruce",
""
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[
"Leeb",
"Bernhard",
""
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] |
801.3094 | Martin Hildebrand | Martin Hildebrand | A lower bound for the Chung-Diaconis-Graham random process | 10 pages; this version makes a small change on p. 6 | null | null | null | math.PR | null | Chung, Diaconis, and Graham considered random processes of the form
X_{n+1}=a_n X_n+b_n (mod p) where p is odd, X_0=0, a_n=2 always, and b_n are
i.i.d. for n=0,1,2,... . In this paper, we show that if
P(b_n=-1)=P{b_n=0)=P(b_n=1)=1/3, then there exists a constant c>1 such that c
log_2 p steps are not enough to make X_n get close to uniformly distributed on
the integers mod p.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 16:38:59 GMT"
},
{
"version": "v2",
"created": "Fri, 30 May 2008 17:26:19 GMT"
}
] | 2008-05-30T00:00:00 | [
[
"Hildebrand",
"Martin",
""
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801.3095 | Yshai Avishai | Yshai Avishai (BGU and RTRA), Konstantin Kikoin (TAU) | Tunneling through Quantum Dots with Discrete Symmetries | Short review (22 pages) prepared for "Encyclopedia of Complexity"
(Springer, 2008) | null | null | null | cond-mat.str-el cond-mat.mes-hall | null | We describe in this short review the influence of discrete symmetries in
complex quantum dots on the Kondo co-tunneling through these nano-objects.
These discrete symmetries stem from the geometrical structure of the tunneling
devices (e.g spatial symmetry of multivalley quantum dot in a tunneling contact
with leads). They affect the dynamical symmetry of spin multiplets
characterizing the ground state and excitations in quantum dots with definite
electron number occupation. The influence of external electric and magnetic
fields on these symmetries is examined, and analogies with the physics of
quantum tunneling through molecular complexes are discussed.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 17:15:10 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Avishai",
"Yshai",
"",
"BGU and RTRA"
],
[
"Kikoin",
"Konstantin",
"",
"TAU"
]
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] |
801.3096 | Leonid Parnovski | Leonid Parnovski | Bethe-Sommerfeld Conjecture | 59 pages, 10 figures; to appear in Annales Henri Poincare | null | 10.1007/s00023-008-0364-x | null | math.SP | null | We consider Schroedinger operator $-\Delta+V$ in $R^d$ ($d\ge 2$) with smooth
periodic potential $V$ and prove that there are only finitely many gaps in its
spectrum.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 17:24:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Parnovski",
"Leonid",
""
]
] | [
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] |
801.3097 | Zhu Han | Jianwei Huang, Zhu Han, Mung Chiang, H. Vincent Poor | Auction-based Resource Allocation for Multi-relay Asynchronous
Cooperative Networks | To appear in the Proceedings of the 2008 IEEE International
Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March
30 to April 4, 2008 | null | 10.1109/ICASSP.2008.4518870 | null | cs.IT math.IT | null | Resource allocation is considered for cooperative transmissions in
multiple-relay wireless networks. Two auction mechanisms, SNR auctions and
power auctions, are proposed to distributively coordinate the allocation of
power among multiple relays. In the SNR auction, a user chooses the relay with
the lowest weighted price. In the power auction, a user may choose to use
multiple relays simultaneously, depending on the network topology and the
relays' prices. Sufficient conditions for the existence (in both auctions) and
uniqueness (in the SNR auction) of the Nash equilibrium are given. The fairness
of the SNR auction and efficiency of the power auction are further discussed.
It is also proven that users can achieve the unique Nash equilibrium
distributively via best response updates in a completely asynchronous manner.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 17:25:56 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Huang",
"Jianwei",
""
],
[
"Han",
"Zhu",
""
],
[
"Chiang",
"Mung",
""
],
[
"Poor",
"H. Vincent",
""
]
] | [
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] |
801.3098 | Laurence Marks | L. D. Marks and D. R. Luke | Robust Mixing for Ab-Initio Quantum Mechanical Calculations | 32 Pages, 4 figures | null | 10.1103/PhysRevB.78.075114 | null | cond-mat.mtrl-sci cond-mat.str-el | null | We study the general problem of mixing for ab-initio quantum-mechanical
problems. Guided by general mathematical principles and the underlying physics,
we propose a multisecant form of Broydens second method for solving the
self-consistent field equations of Kohn-Sham density functional theory. The
algorithm is robust, requires relatively little finetuning and appears to
outperform the current state of the art, converging for cases that defeat many
other methods. We compare our technique to the conventional methods for
problems ranging from simple to nearly pathological.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 17:57:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marks",
"L. D.",
""
],
[
"Luke",
"D. R.",
""
]
] | [
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] |
801.3099 | Andrew Knyazev | Andrew V. Knyazev and Klaus Neymeyr | Gradient flow approach to geometric convergence analysis of
preconditioned eigensolvers | 8 pages, 2 figures. Accepted to SIAM J. Matrix Anal. (SIMAX) | SIAM. J. Matrix Anal. & Appl. Volume 31, Issue 2, pp. 621-628
(2009) | 10.1137/080727567 | CUD CCM 263 | math.NA math.OC | http://creativecommons.org/licenses/publicdomain/ | Preconditioned eigenvalue solvers (eigensolvers) are gaining popularity, but
their convergence theory remains sparse and complex. We consider the simplest
preconditioned eigensolver--the gradient iterative method with a fixed step
size--for symmetric generalized eigenvalue problems, where we use the gradient
of the Rayleigh quotient as an optimization direction. A sharp convergence rate
bound for this method has been obtained in 2001--2003. It still remains the
only known such bound for any of the methods in this class. While the bound is
short and simple, its proof is not. We extend the bound to Hermitian matrices
in the complex space and present a new self-contained and significantly shorter
proof using novel geometric ideas.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 18:25:57 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jun 2008 18:47:37 GMT"
},
{
"version": "v3",
"created": "Mon, 16 Mar 2009 16:56:29 GMT"
}
] | 2010-06-02T00:00:00 | [
[
"Knyazev",
"Andrew V.",
""
],
[
"Neymeyr",
"Klaus",
""
]
] | [
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] |
801.31 | Mohamad Ali Jafarizadeh | M. A. Jafarizadeh, M. Mahdian, A. Heshmati, K. Aghayari | Detecting three-qubit bound MUB diagonal entangled states via Nonlinear
optimal entanglement witnesses | 34 pages 11 figures | null | 10.1140/epjd/e2008-00200-6 | null | quant-ph | null | One of the important approaches to detect quantum entanglement is using
linear entanglement witnesses EWs. In this paper, by determining the envelope
of the boundary hyper-planes defined by a family of linear EWs, a set of
powerful nonlinear optimal EWs is manipulated. These EWs enable us to detect
some three qubits bound MUB (mutually unbiased bases) diagonal entangled
states, i.e., the PPT (positive partial transpose) entangled states. Also, in
some particular cases, the introduced nonlinear optimal EWs are powerful enough
to separate the bound entangled regions from the separable ones. Finally, we
present numerical examples to demonstrate the practical accessibility of this
approach.
Keywords :nonlinear optimal entanglement witnesses, mutually unbiased bases,
MUB diagonal states
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 18:27:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jafarizadeh",
"M. A.",
""
],
[
"Mahdian",
"M.",
""
],
[
"Heshmati",
"A.",
""
],
[
"Aghayari",
"K.",
""
]
] | [
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] |
801.3101 | Michela Artebani | Michela Artebani and Alessandra Sarti | Non-symplectic automorphisms of order 3 on K3 surfaces | 17 pages | null | null | null | math.AG | null | In this paper we study K3 surfaces with a non-symplectic automorphism of
order 3. In particular, we classify the topological structure of the fixed
locus of such automorphisms and we show that it determines the action on
cohomology. This allows us to describe the structure of the moduli space and to
show that it has three irreducible components.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 18:37:31 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Artebani",
"Michela",
""
],
[
"Sarti",
"Alessandra",
""
]
] | [
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] |
801.3102 | Eloisa Bentivegna | Mark Wenstrom, Eloisa Bentivegna and Ali Hurson (Pennsylvania State
University) | Balancing transparency, efficiency and security in pervasive systems | 52 pages, to be published in Advances in Computers | null | null | null | cs.HC cs.IR | null | This chapter will survey pervasive computing with a look at how its
constraint for transparency affects issues of resource management and security.
The goal of pervasive computing is to render computing transparent, such that
computing resources are ubiquitously offered to the user and services are
proactively performed for a user without his or her intervention. The task of
integrating computing infrastructure into everyday life without making it
excessively invasive brings about tradeoffs between flexibility and robustness,
efficiency and effectiveness, as well as autonomy and reliability. As the
feasibility of ubiquitous computing and its real potential for mass
applications are still a matter of controversy, this chapter will look into the
underlying issues of resource management and authentication to discover how
these can be handled in a least invasive fashion. The discussion will be closed
by an overview of the solutions proposed by current pervasive computing
efforts, both in the area of generic platforms and for dedicated applications
such as pervasive education and healthcare.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 19:15:50 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Wenstrom",
"Mark",
"",
"Pennsylvania State\n University"
],
[
"Bentivegna",
"Eloisa",
"",
"Pennsylvania State\n University"
],
[
"Hurson",
"Ali",
"",
"Pennsylvania State\n University"
]
] | [
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] |
801.3103 | Bernhard Keller | Bernhard Keller | Categorification of acyclic cluster algebras: an introduction | 15 pages, references updated | null | null | null | math.RT math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a concise introduction to Fomin-Zelevinsky's cluster algebras and
their links with the representation theory of quivers in the acyclic case. We
review the definition of cluster algebras (geometric, without coefficients),
construct the cluster category and present the bijection between cluster
variables and rigid indecomposable objects of the cluster category.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 19:40:40 GMT"
},
{
"version": "v2",
"created": "Sat, 9 Oct 2010 17:29:27 GMT"
}
] | 2010-10-12T00:00:00 | [
[
"Keller",
"Bernhard",
""
]
] | [
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] |
801.3104 | Fergal Mullally | F. Mullally, D. E. Winget, Steven Degennaro, Elizabeth Jeffery, S. E.
Thompson, Dean Chandler | Limits on Planets Around White Dwarf Stars | 19 pages, accepted for publication in ApJ | null | null | null | astro-ph | null | We present limits on planetary companions to pulsating white dwarf stars. A
subset of these stars exhibit extreme stability in the period and phase of some
of their pulsation modes; a planet can be detected around such a star by
searching for periodic variations in the arrival time of these pulsations. We
present limits on companions greater than a few Jupiter masses around a sample
of 15 white dwarf stars as part of an on-going survey. One star shows a
variation in arrival time consistent with a 2 M_J planet in a 4.5 year orbit.
We discuss other possible explanations for the observed signal and conclude
that a planet is the most plausible explanation based on the data available.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 20:06:03 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Mullally",
"F.",
""
],
[
"Winget",
"D. E.",
""
],
[
"Degennaro",
"Steven",
""
],
[
"Jeffery",
"Elizabeth",
""
],
[
"Thompson",
"S. E.",
""
],
[
"Chandler",
"Dean",
""
]
] | [
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801.3105 | Anton Leykin | Anton Leykin | Numerical primary decomposition | 16 pages, minor changes made, references added | null | null | null | math.AG math.NA | null | Consider an ideal $I \subset R = \bC[x_1,...,x_n]$ defining a complex affine
variety $X \subset \bC^n$. We describe the components associated to $I$ by
means of {\em numerical primary decomposition} (NPD).
The method is based on the construction of {\em deflation ideal} $I^{(d)}$
that defines the {\em deflated variety} $\dXd$ in a complex space of higher
dimension. For every embedded component there exists $d$ and an isolated
component $\dYd$ of $\dId$ projecting onto $Y$. In turn, $\dYd$ can be
discovered by existing methods for prime decomposition, in particular, the {\em
numerical irreducible decomposition}, applied to $\dXd$.
The concept of NPD gives a full description of the scheme $\Spec(R/I)$ by
representing each component with a {\em witness set}. We propose an algorithm
to produce a collection of witness sets that contains a NPD and that can be
used to solve the {\em ideal membership problem} for $I$.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 20:25:17 GMT"
},
{
"version": "v2",
"created": "Thu, 29 May 2008 21:23:50 GMT"
}
] | 2008-05-30T00:00:00 | [
[
"Leykin",
"Anton",
""
]
] | [
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801.3106 | Javad Shabani | J. Shabani, M. Shayegan and R. Winkler | Strain-induced Fermi contour anisotropy of GaAs 2D holes | Accepted for publication in Phys. Rev. Lett | Phys. Rev. Lett. 100, 096803 (2008) | 10.1103/PhysRevLett.100.096803 | null | cond-mat.mes-hall | null | We report measurements of magneto-resistance commensurability peaks, induced
by a square array of anti-dots, in GaAs (311)A two-dimensional holes as a
function of applied in-plane strain. The data directly probe the shapes of the
Fermi contours of the two spin subbands that are split thanks to the spin-orbit
interaction and strain. The experimental results are in quantitative agreement
with the predictions of accurate energy band calculations, and reveal that the
majority spin-subband has a severely distorted Fermi contour whose anisotropy
can be tuned with strain.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 21:35:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shabani",
"J.",
""
],
[
"Shayegan",
"M.",
""
],
[
"Winkler",
"R.",
""
]
] | [
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801.3107 | Vesko Valov | Taras Banakh and Vesko Valov | Approximation by light maps and parametric Lelek maps | 34 pages | null | null | null | math.GT math.GN | null | The class of metrizable spaces $M$ with the following approximation property
is introduced and investigated: $M\in AP(n,0)$ if for every $\e>0$ and a map
$g\colon\I^n\to M$ there exists a 0-dimensional map $g'\colon\I^n\to M$ which
is $\e$-homotopic to $g$. It is shown that this class has very nice properties.
For example, if $M_i\in AP(n_i,0)$, $i=1,2$, then $M_1\times M_2\in
AP(n_1+n_2,0)$. Moreover, $M\in AP(n,0)$ if and only if each point of $M$ has a
local base of neighborhoods $U$ with $U\in AP(n,0)$. Using the properties of
AP(n,0)-spaces, we generalize some results of Levin and Kato-Matsuhashi
concerning the existence of residual sets of $n$-dimensional Lelek maps.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 22:11:52 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Banakh",
"Taras",
""
],
[
"Valov",
"Vesko",
""
]
] | [
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] |
801.3108 | Svjetlana Terzic | Victor M. Buchstaber, Svjetlana Terzic | Equivariant complex structures on homogeneous spaces and their cobordism
classes | 30 pages; this is the extension of arXiv:0708.2054v2 [math.AT] with
an application to some new problems | null | null | null | math.AT math.AG | null | We consider compact homogeneous spaces G/H, where G is a compact connected
Lie group and H is its closed connected subgroup of maximal rank. The aim of
this paper is to provide an effective computation of the universal toric genus
for the complex, almost complex and stable complex structures which are
invariant under the canonical left action of the maximal torus T^k on G/H. As
it is known, on G/H we may have many such structures and the computations of
their toric genus in terms of fixed points for the same torus action give the
constraints on possible collections of weights for the corresponding
representations of T^k in the tangent spaces at the fixed points, as well as on
the signs at these points. In that context, the effectiveness is also
approached due to an explicit description of the relations between the weights
and signs for an arbitrary couple of such structures. Special attention is
devoted to the structures which are invariant under the canonical action of the
group G. Using classical results, we obtain an explicit description of the
weights and signs in this case. We consequently obtain an expression for the
cobordism classes of such structures in terms of coefficients of the formal
group law in cobordisms, as well as in terms of Chern numbers in cohomology.
These computations require no information on the cohomology ring of the
manifold G/H, but, on their own, give important relations in this ring. As an
application we provide an explicit formula for the cobordism classes and
characteristic numbers of the flag manifolds U(n)/T^n, Grassmann manifolds
G_{n,k}=U(n)/(U(k)\times U(n-k)) and some particular interesting examples.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 23:23:46 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Buchstaber",
"Victor M.",
""
],
[
"Terzic",
"Svjetlana",
""
]
] | [
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] |
801.3109 | Pietro Peterlongo | Stefano Galatolo, Pietro Peterlongo | Long hitting time, slow decay of correlations and arithmetical
properties | 19 pages, in the new version some misprint and small errors are
corrected | null | null | null | math.DS math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $\tau_r(x,x_0)$ be the time needed for a point $x$ to enter for the first
time in a ball $B_r(x_0)$ centered in $x_0$, with small radius $r$. We
construct a class of translations on the two torus having particular arithmetic
properties (Liouville components with intertwined denominators of convergents)
not satisfying a logarithm law, i.e. such that for generic $x,x_0$
\liminf_{r\to 0} \frac{\log \tau_r(x,x_0)}{-\log r} = \infty.
By considering a suitable reparametrization of the flow generated by a
suspension of this translation, using a previous construction by Fayad, we show
the existence of a mixing system on three torus having the same properties. The
speed of mixing of this example must be subpolynomial, because we also show
that: in a system having polynomial decay of correlations the above ratio of
logarithms (which is also called the lower hitting time indicator) is bounded
(it is a function of the local dimension and the speed of correlation decay).
More generally, this shows that reparametrizations of torus translations
having a Liouville component cannot be polynomially mixing.
| [
{
"version": "v1",
"created": "Sun, 20 Jan 2008 23:58:35 GMT"
},
{
"version": "v2",
"created": "Sun, 30 Mar 2008 14:41:51 GMT"
},
{
"version": "v3",
"created": "Wed, 11 Mar 2009 21:08:55 GMT"
},
{
"version": "v4",
"created": "Mon, 23 Mar 2009 10:52:15 GMT"
},
{
"version": "v5",
"created": "Tue, 14 Jul 2009 14:07:39 GMT"
}
] | 2009-07-14T00:00:00 | [
[
"Galatolo",
"Stefano",
""
],
[
"Peterlongo",
"Pietro",
""
]
] | [
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] |
801.311 | Daniela Henzlova | D. Henzlova, K.-H. Schmidt, M. V. Ricciardi, A. Kelic, V. Henzl, P.
Napolitani, L. Audouin, J. Benlliure, A. Boudard, E. Casarejos, J. E. Ducret,
T. Enqvist, A. Heinz, A. Junghans, B. Jurado, A. Krasa, T. Kurtukian, S.
Leray, M. F. Ordonez, J. Pereira, R. Pleskac, F. Rejmund, C. Schmitt, C.
Stephan, L. Tassan-Got, C. Villagrasa, C. Volant, A. Wagner and O. Yordanov | Experimental investigation of the residues produced in the 136Xe+Pb and
124Xe+Pb fragmentation reactions at 1 A GeV | 31 pages, 9 figures, 1 table, background information on
http://www.gsi.de/charms | null | 10.1103/PhysRevC.78.044616 | null | nucl-ex | null | This paper presents the nuclide cross sections and the longitudinal velocity
distributions of residues produced in the reactions of 136Xe and 124Xe at 1 A
GeV in a lead target, measured at the high-resolution magnetic spectrometer,
the Fragment Separator (FRS) of GSI. The data cover a broad range of isotopes
of the elements between Z = 3 and Z = 56 for 136Xe and between Z = 5 and Z = 55
for 124Xe, reaching down to cross sections of a few microbarns. The velocity
distributions exhibit a Gaussian shape for masses above A = 20, while more
complex behaviour is observed for lighter masses. The isotopic distributions
for both reactions preserve a memory on the projectile N/Z ratio over the whole
residue mass range.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 15:24:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Henzlova",
"D.",
""
],
[
"Schmidt",
"K. -H.",
""
],
[
"Ricciardi",
"M. V.",
""
],
[
"Kelic",
"A.",
""
],
[
"Henzl",
"V.",
""
],
[
"Napolitani",
"P.",
""
],
[
"Audouin",
"L.",
""
],
[
"Benlliure",
"J.",
""
],
[
"Boudard",
"A.",
""
],
[
"Casarejos",
"E.",
""
],
[
"Ducret",
"J. E.",
""
],
[
"Enqvist",
"T.",
""
],
[
"Heinz",
"A.",
""
],
[
"Junghans",
"A.",
""
],
[
"Jurado",
"B.",
""
],
[
"Krasa",
"A.",
""
],
[
"Kurtukian",
"T.",
""
],
[
"Leray",
"S.",
""
],
[
"Ordonez",
"M. F.",
""
],
[
"Pereira",
"J.",
""
],
[
"Pleskac",
"R.",
""
],
[
"Rejmund",
"F.",
""
],
[
"Schmitt",
"C.",
""
],
[
"Stephan",
"C.",
""
],
[
"Tassan-Got",
"L.",
""
],
[
"Villagrasa",
"C.",
""
],
[
"Volant",
"C.",
""
],
[
"Wagner",
"A.",
""
],
[
"Yordanov",
"O.",
""
]
] | [
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] |
801.3111 | Martin Pelikan | Martin Pelikan | Analysis of Estimation of Distribution Algorithms and Genetic Algorithms
on NK Landscapes | Also available at the MEDAL web site, http://medal.cs.umsl.edu/ | Proceedings of the Genetic and Evolutionary Computation Conference
(GECCO-2008), ACM Press, 1033-1040 | null | MEDAL Report No. 2008001 | cs.NE cs.AI | null | This study analyzes performance of several genetic and evolutionary
algorithms on randomly generated NK fitness landscapes with various values of n
and k. A large number of NK problem instances are first generated for each n
and k, and the global optimum of each instance is obtained using the
branch-and-bound algorithm. Next, the hierarchical Bayesian optimization
algorithm (hBOA), the univariate marginal distribution algorithm (UMDA), and
the simple genetic algorithm (GA) with uniform and two-point crossover
operators are applied to all generated instances. Performance of all algorithms
is then analyzed and compared, and the results are discussed.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 00:20:50 GMT"
}
] | 2008-07-30T00:00:00 | [
[
"Pelikan",
"Martin",
""
]
] | [
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] |
801.3112 | Vinod Prabhakaran | Adnan Raja, Vinod M. Prabhakaran, and Pramod Viswanath | The Two User Gaussian Compound Interference Channel | null | null | null | null | cs.IT math.IT | null | We introduce the two user finite state compound Gaussian interference channel
and characterize its capacity region to within one bit. The main contributions
involve both novel inner and outer bounds. The inner bound is multilevel
superposition coding, but the decoding of the levels is opportunistic,
depending on the channel state. The genie aided outer bound is motivated by the
typical error events of the achievable scheme.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 00:15:18 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Mar 2008 16:14:32 GMT"
},
{
"version": "v3",
"created": "Thu, 1 May 2008 00:17:44 GMT"
}
] | 2008-05-01T00:00:00 | [
[
"Raja",
"Adnan",
""
],
[
"Prabhakaran",
"Vinod M.",
""
],
[
"Viswanath",
"Pramod",
""
]
] | [
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] |
801.3113 | Martin Pelikan | Martin Pelikan, Kumara Sastry, and David E. Goldberg | iBOA: The Incremental Bayesian Optimization Algorithm | Also available at the MEDAL web site, http://medal.cs.umsl.edu/ | Proceedings of the Genetic and Evolutionary Computation Conference
(GECCO-2008), ACM Press, 455-462 | null | MEDAL Report No. 2008002 | cs.NE cs.AI | null | This paper proposes the incremental Bayesian optimization algorithm (iBOA),
which modifies standard BOA by removing the population of solutions and using
incremental updates of the Bayesian network. iBOA is shown to be able to learn
and exploit unrestricted Bayesian networks using incremental techniques for
updating both the structure as well as the parameters of the probabilistic
model. This represents an important step toward the design of competent
incremental estimation of distribution algorithms that can solve difficult
nearly decomposable problems scalably and reliably.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 00:34:55 GMT"
}
] | 2008-07-30T00:00:00 | [
[
"Pelikan",
"Martin",
""
],
[
"Sastry",
"Kumara",
""
],
[
"Goldberg",
"David E.",
""
]
] | [
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] |
801.3114 | Grenville Croll | Raymond R. Panko | Thinking is Bad: Implications of Human Error Research for Spreadsheet
Research and Practice | 12 pages including references | Proc. European Spreadsheet Risks Int. Grp. 2007 69-80 ISBN
978-905617-58-6 | null | null | cs.HC | null | In the spreadsheet error community, both academics and practitioners
generally have ignored the rich findings produced by a century of human error
research. These findings can suggest ways to reduce errors; we can then test
these suggestions empirically. In addition, research on human error seems to
suggest that several common prescriptions and expectations for reducing errors
are likely to be incorrect. Among the key conclusions from human error research
are that thinking is bad, that spreadsheets are not the cause of spreadsheet
errors, and that reducing errors is extremely difficult.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 00:33:15 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Panko",
"Raymond R.",
""
]
] | [
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] |
801.3115 | Stephen Tegler | S.C. Tegler, W.M. Grundy, F. Vilas, W. Romanishin, D. Cornelison, G.J.
Consolmagno | Evidence of N2-Ice On the Surface of the Icy Dwarf Planet 136472 (2005
FY9) | The paper will appear in Icarus. It has 33 pages, 2 tables, and 7
figures. Replaced version fixed typo in abstract | Icarus 195:844-850,2008 | 10.1016/j.icarus.2007.12.015 | null | astro-ph | null | We present high signal precision optical reflectance spectra of 2005 FY9
taken with the Red Channel Spectrograph and the 6.5-m MMT telescope on 2006
March 4 UT (5000 - 9500 A; 6.33 A pixel-1) and 2007 February 12 UT (6600 - 8500
A; 1.93 A pixel-1). From cross correlation experiments between the 2006 March 4
spectrum and a pure CH4-ice Hapke model, we find the CH4-ice bands in the MMT
spectrum are blueshifted by 3 +/- 4 A relative to bands in the pure CH4-ice
Hapke spectrum. The higher resolution MMT spectrum of 2007 February 12 UT
enabled us to measure shifts of individual CH4-ice bands. We find the 7296 A,
7862 A, and 7993 A CH4-ice bands are blueshifted by 4 +/- 2 A, 4 +/- 4 A, and 6
+/- 5 A. From four measurements we report here and one of our previously
published measurements, we find the CH4-ice bands are shifted by 4 +/- 1 A.
This small shift is important because it suggest the presence of another ice
component on the surface of 2005 FY9. Laboratory experiments show that CH4-ice
bands in spectra of CH4 mixed with other ices are blueshifted relative to bands
in spectra of pure CH4-ice. A likely candidate for the other component is
N2-ice because its weak 2.15 micron band and blueshifted CH4 bands are seen in
spectra of Triton and Pluto. Assuming the shift is due to the presence of N2,
spectra taken on two consecutive nights show no difference in CH4/N2. In
addition, we find no measureable difference in CH4/N2 at different depths into
the surface of 2005 FY9.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 01:02:50 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Tegler",
"S. C.",
""
],
[
"Grundy",
"W. M.",
""
],
[
"Vilas",
"F.",
""
],
[
"Romanishin",
"W.",
""
],
[
"Cornelison",
"D.",
""
],
[
"Consolmagno",
"G. J.",
""
]
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801.3116 | Grenville Croll | Ralph Baxter | Enterprise Spreadsheet Management: A Necessary Good | 8 pages, includes references | Proc. European Spreadsheet Risks Int. Grp. 2007 7-13 ISBN
978-905617-58-6 | null | null | cs.CY | null | This paper presents the arguments and supporting business metrics for
Enterprise Spreadsheet Management to be seen as a necessary good. These
arguments are divided into a summary of external business drivers that make it
necessary and the good that may be delivered to business spreadsheet users
involved in repetitive manual processes.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 00:41:18 GMT"
}
] | 2008-03-13T00:00:00 | [
[
"Baxter",
"Ralph",
""
]
] | [
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801.3117 | Yongzhi Cao | Yongzhi Cao | A hierarchy of behavioral equivalences in the $\pi$-calculus with noisy
channels | 30 pages, 2 figures | Comput. J., vol. 53, no. 1, pp. 3-20, 2010 | null | null | cs.LO | null | The $\pi$-calculus is a process algebra where agents interact by sending
communication links to each other via noiseless communication channels. Taking
into account the reality of noisy channels, an extension of the $\pi$-calculus,
called the $\pi_N$-calculus, has been introduced recently. In this paper, we
present an early transitional semantics of the $\pi_N$-calculus, which is not a
directly translated version of the late semantics of $\pi_N$, and then extend
six kinds of behavioral equivalences consisting of reduction bisimilarity,
barbed bisimilarity, barbed equivalence, barbed congruence, bisimilarity, and
full bisimilarity into the $\pi_N$-calculus. Such behavioral equivalences are
cast in a hierarchy, which is helpful to verify behavioral equivalence of two
agents. In particular, we show that due to the noisy nature of channels, the
coincidence of bisimilarity and barbed equivalence, as well as the coincidence
of full bisimilarity and barbed congruence, in the $\pi$-calculus does not hold
in $\pi_N$.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 00:42:52 GMT"
}
] | 2011-10-04T00:00:00 | [
[
"Cao",
"Yongzhi",
""
]
] | [
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] |
801.3118 | Grenville Croll | Simon Murphy | Spreadsheet Hell | 6 pages | Proc. European Spreadsheet Risks Int. Grp. 2007 15-20 ISBN
978-905617-58-6 | null | null | cs.CY | null | This management paper looks at the real world issues faced by practitioners
managing spreadsheets through the production phase of their life cycle. It
draws on the commercial experience of several developers working with large
corporations, either as employees or consultants or contractors. It provides
commercial examples of some of the practicalities involved with spreadsheet use
around the enterprise.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 00:51:12 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Murphy",
"Simon",
""
]
] | [
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] |
801.3119 | Grenville Croll | Mukul Madahar, Pat Cleary, David Ball | Categorisation of Spreadsheet Use within Organisations, Incorporating
Risk: A Progress Report | 10 pages | Proc. European Spreadsheet Risks Int. Grp. 2007 37-45 ISBN
978-905617-58-6 | null | null | cs.CY cs.HC | null | There has been a significant amount of research into spreadsheets over the
last two decades. Errors in spreadsheets are well documented. Once used mainly
for simple functions such as logging, tracking and totalling information,
spreadsheets with enhanced formulas are being used for complex calculative
models. There are many software packages and tools which assist in detecting
errors within spreadsheets. There has been very little evidence of
investigation into the spreadsheet risks associated with the main stream
operations within an organisation. This study is a part of the investigation
into the means of mitigating risks associated with spreadsheet use within
organisations. In this paper the authors present and analyse three proposed
models for categorisation of spreadsheet use and the level of risks involved.
The models are analysed in the light of current knowledge and the general risks
associated with organisations.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 00:57:31 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Madahar",
"Mukul",
""
],
[
"Cleary",
"Pat",
""
],
[
"Ball",
"David",
""
]
] | [
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] |
801.312 | Svetlana Varchenko | E.Mukhin, V.Tarasov, A.Varchenko | Spaces of quasi-exponentials and representations of gl_N | Latex, 29 pages | null | 10.1088/1751-8113/41/19/194017 | null | math.QA math-ph math.AG math.MP | null | We consider the action of the Bethe algebra B_K on (\otimes_{s=1}^k
L_{\lambda^{(s)}})_\lambda, the weight subspace of weight $\lambda$ of the
tensor product of k polynomial irreducible gl_N-modules with highest weights
\lambda^{(1)},...,\lambda^{(k)}, respectively. The Bethe algebra depends on N
complex numbers K=(K_1,...,K_N). Under the assumption that K_1,...,K_N are
distinct, we prove that the image of B_K in the endomorphisms of
(\otimes_{s=1}^k L_{\lambda^{(s)}})_\lambda is isomorphic to the algebra of
functions on the intersection of k suitable Schubert cycles in the Grassmannian
of N-dimensional spaces of quasi-exponentials with exponents K. We also prove
that the B_K-module (\otimes_{s=1}^k L_{\lambda^{(s)}})_\lambda is isomorphic
to the coregular representation of that algebra of functions. We present a
Bethe ansatz construction identifying the eigenvectors of the Bethe algebra
with points of that intersection of Schubert cycles.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 01:04:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mukhin",
"E.",
""
],
[
"Tarasov",
"V.",
""
],
[
"Varchenko",
"A.",
""
]
] | [
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0.0158685353,
-0.002462246,
0.0419926047,
-0.1327186525,
0.0638413504,
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] |
801.3121 | Kentaro Nomura | Kentaro Nomura, Shinsei Ryu, Mikito Koshino, Christopher Mudry, Akira
Furusaki | Quantum Hall Effect of Massless Dirac Fermions in a Vanishing Magnetic
Field | 5 pages, 4 figures | Phys. Rev. Lett. 100, 246806 (2008) | 10.1103/PhysRevLett.100.246806 | null | cond-mat.mes-hall | null | The effect of strong long-range disorder on the quantization of the Hall
conductivity $\sigma_{xy}$ in graphene is studied numerically. It is shown that
increasing Landau-level mixing progressively destroys all plateaus in
$\sigma_{xy}$ except the plateaus at $\sigma_{xy}=\mp e^2/2h$ (per valley and
per spin). The critical state at the charge-neutral Dirac point is robust to
strong disorder and belongs to the universality class of the conventional
plateau transitions in the integer quantum Hall effect. We propose that the
breaking of time-reversal symmetry by ripples in graphene can realize this
quantum critical point in a vanishing magnetic field.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 01:56:05 GMT"
},
{
"version": "v2",
"created": "Mon, 12 May 2008 13:55:06 GMT"
}
] | 2008-06-30T00:00:00 | [
[
"Nomura",
"Kentaro",
""
],
[
"Ryu",
"Shinsei",
""
],
[
"Koshino",
"Mikito",
""
],
[
"Mudry",
"Christopher",
""
],
[
"Furusaki",
"Akira",
""
]
] | [
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] |
801.3122 | Patrick Coles | Patrick J. Coles | Helicity asymmetry of optically-pumped NMR spectra in GaAs | 4 pages, 3 figures, added thermometry data | null | 10.1103/PhysRevB.78.033201 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | The origin of helicity asymmetries in the optically-pumped NMR signal and
hyperfine shift in GaAs is derived analytically and tested experimentally. The
ratio of the optically-pumped to the equilibrium electron polarizations is a
key parameter in determining both asymmetries. Variations in asymmetry with
photon energy and laser power reflect variations in the local temperature and
the electron spin polarization, and these two quantities are extracted from the
asymmetry through a simple methodology. Other contributions to the asymmetry
are considered.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 03:23:27 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 06:47:38 GMT"
},
{
"version": "v3",
"created": "Fri, 9 May 2008 08:50:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Coles",
"Patrick J.",
""
]
] | [
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] |
801.3123 | Cai-Dian Lu | Wei Wang, Yu-Ming Wang, De-Shan Yang and Cai-Dian Lu | Charmless Two-body $B(B_s)\to VP$ decays In
Soft-Collinear-Effective-Theory | 34 pages, revtex, 2 figures, published at PRD | Phys.Rev.D78:034011,2008 | 10.1103/PhysRevD.78.034011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide the analysis of charmless two-body $B\to VP$ decays under the
framework of the soft-collinear-effective-theory (SCET), where $V(P)$ denotes a
light vector (pseudoscalar) meson. Besides the leading power contributions,
some power corrections (chiraly enhanced penguins) are also taken into account.
Using the current available $B\to PP$ and $B\to VP$ experimental data on
branching fractions and CP asymmetry variables, we find two kinds of solutions
in $\chi^2$ fit for the 16 non-perturbative inputs which are essential in the
87 $B\to PP$ and $B\to VP$ decay channels. Chiraly enhanced penguins can change
several charming penguins sizably, since they share the same topology. However,
most of the other non-perturbative inputs and predictions on branching ratios
and CP asymmetries are not changed too much. With the two sets of inputs, we
predict the branching fractions and CP asymmetries of other modes especially
$B_s\to VP$ decays. The agreements and differences with results in QCD
factorization and perturbative QCD approach are analyzed. We also study the
time-dependent CP asymmetries in channels with CP eigenstates in the final
states and some other channels such as $\bar B^0/B^0\to\pi^\pm\rho^\mp$ and
$\bar B_s^0/B_s^0\to K^\pm K^{*\mp}$. In the perturbative QCD approach, the
$(S-P)(S+P)$ penguins in annihilation diagrams play an important role. Although
they have the same topology with charming penguins in SCET, there are many
differences between the two objects in weak phases, magnitudes, strong phases
and factorization properties.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 03:59:22 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Aug 2008 08:28:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wang",
"Wei",
""
],
[
"Wang",
"Yu-Ming",
""
],
[
"Yang",
"De-Shan",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | [
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] |
801.3124 | Yutaka Tobita | Kenzo Ishikawa, Yutaka Tobita | Coherence length of cosmic background radiation enlarges the attenuation
length of the ultra-high energy proton | 8 pages, 2 figures,study about the second coherence length has been
added | null | null | EPHOU-08-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is pointed out that an agreement of the one particle energy spectrum of
the cosmic background radiation (CMBR) with Plank distribution of 2.725 [K]
does not give a strong constraint on the coherence length of CMBR if the mean
free path of CMBR is very long. The coherence length in this situation is
estimated as a few times of $k_BT$. Due to this finite coherence length, the
attenuation length of ultra-high energy cosmic rays (UHECR) is reduced in the
$\Delta $ resonance region,i.e., around $10^{20}$ [eV]. The small attenuation
length makes the suppression of the flux of cosmic rays in this energy region
less prominent than the naive estimation
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 04:54:50 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Jun 2009 16:28:19 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Mar 2010 10:14:26 GMT"
}
] | 2010-03-10T00:00:00 | [
[
"Ishikawa",
"Kenzo",
""
],
[
"Tobita",
"Yutaka",
""
]
] | [
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] |
801.3125 | Sankarasubramanian Kasiviswanathan | K. Sankarasubramanian, T. Rimmele | High Resolution Observations using Adaptive Optics: Achievements and
Future Needs | null | null | 10.1007/s12036-008-0043-9 | null | astro-ph | null | Over the last few years, several interesting observations were obtained with
the help of solar Adaptive Optics (AO). In this paper, few observations made
using the solar AO are enlightened and briefly discussed. A list of
disadvantages with the current AO system are presented. With telescopes larger
than 1.5m are expected during the next decade, there is a need to develop the
existing AO technologies for large aperture telescopes. Some aspects of this
development are highlighted. Finally, the recent AO developments in India are
also presented.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 05:27:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sankarasubramanian",
"K.",
""
],
[
"Rimmele",
"T.",
""
]
] | [
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] |
801.3126 | Pankaj Jain | Pankaj Jain, Satish D. Joglekar and Subhadip Mitra | Two Photon Exchange Contributions to Elastic e + p --> e + p Process in
a Nonlocal Field Formalism | 10 pages 7 figures | Eur.Phys.J.C57:671-680,2008 | 10.1140/epjc/s10052-008-0710-7 | null | hep-ph nucl-ex nucl-th | null | We compute the two photon exchange contributions to elastic scattering of
polarized electrons from target protons. We use a nonlocal field theory
formalism for this calculation. The formalism maintains gauge invariance and
provides a systematic procedure for making this calculation. The results depend
on one unknown parameter \bar b. We compute the two photon exchange correction
to the ratio of electric to magnetic form factors extracted using the
polarization transfer experiments. The correction is found to be small if \bar
b ~ 1. However for larger values of \bar b>3, the correction can be quite
significant. The correction to the polarization transfer results goes in the
right direction to explain their difference with the ratio measured by
Rosenbluth separation method. We find that the difference between the two
experimental results can be explained for a wide range of values of the
parameter \bar b. We also find that the corrections due to two photon exchange
depend on the photon longitudinal polarization epsilon. Hence we predict an
epsilon dependence of the form factor ratio extracted using the polarization
transfer technique. Finally we obtain a limit on \bar b by requiring that the
non-linearity in epsilon dependence of the unpolarized reduced cross section is
within experimental errors.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 05:30:14 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Jain",
"Pankaj",
""
],
[
"Joglekar",
"Satish D.",
""
],
[
"Mitra",
"Subhadip",
""
]
] | [
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] |
801.3127 | Lianyi He | Lianyi He and Pengfei Zhuang | Phase Diagram of Cold Polarized Fermi Gas in Two Dimensions | V3: extended version according to referee's comment. 12 pages, 6
figures. Analytical results of density profile in trapped system are
reported; V4: Version accepted by Physical Review A | Phys.Rev.A78:033613,2008 | 10.1103/PhysRevA.78.033613 | null | cond-mat.supr-con cond-mat.other cond-mat.str-el hep-ph nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The superfluid phase diagrams of a two-dimensional cold polarized Fermi gas
in the BCS-BEC crossover are systematically and analytically investigated. In
the BCS-Leggett mean field theory, the transition from unpolarized superfluid
phase to normal phase is always of first order. For a homogeneous system, the
two critical Zeeman fields and the critical population imbalance are
analytically determined in the whole coupling parameter region, and the
superfluid-normal mixed phase is shown to be the ground state between the two
critical fields. The density profile in the presence of a harmonic trap
calculated in the local density approximation exhibits a shell structure, a
superfluid core at the center and a normal shell outside. For weak interaction,
the normal shell contains a partially polarized cloud with constant density
difference surrounded by a fully polarized state. For strong interaction, the
normal shell is totally in fully polarized state with a density profile
depending only on the global population imbalance. The di-fermion bound states
can survive in the whole highly imbalanced normal phase.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 05:37:43 GMT"
},
{
"version": "v2",
"created": "Sun, 13 Apr 2008 07:50:57 GMT"
},
{
"version": "v3",
"created": "Sun, 18 May 2008 11:10:02 GMT"
},
{
"version": "v4",
"created": "Sat, 6 Sep 2008 04:52:45 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"He",
"Lianyi",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | [
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801.3128 | Nagaraju K | K. Nagaraju, K. Sankarasubramanian, and K. E. Rangarajan | On the Weakening of Chromospheric Magnetic Field in Active Regions | accepted for publication in ApJ | null | 10.1086/533433 | null | astro-ph | null | Simultaneous measurement of line-of-sight (LOS) magnetic and velocity fields
at the photosphere and chromosphere are presented. Fe I line at $\lambda6569$
and $H_{\alpha}$ at $\lambda6563$ are used respectively for deriving the
physical parameters at photospheric and chromospheric heights. The LOS magnetic
field obtained through the center-of-gravity method show a linear relation
between photospheric and chromospheric field for field strengths less than 700
G. But in strong field regions, the LOS magnetic field values derived from
$H_{\alpha}$ are much weaker than what one gets from the linear relationship
and also from those expected from the extrapolation of the photospheric
magnetic field. We discuss in detail the properties of magnetic field observed
in $H_{\alpha}$ from the point of view of observed velocity gradients. The
bisector analysis of $H_{\alpha}$ Stokes $I$ profiles show larger velocity
gradients in those places where strong photospheric magnetic fields are
observed. These observations may support the view that the stronger fields
diverge faster with height compared to weaker fields.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 05:37:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nagaraju",
"K.",
""
],
[
"Sankarasubramanian",
"K.",
""
],
[
"Rangarajan",
"K. E.",
""
]
] | [
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] |
801.3129 | Iftikhar Ahmad | Iftikhar Ahmad, Yun-Song Piao, Cong-Feng Qiao | Spectrum of Curvature Perturbation of Multi-field Inflation with
Small-Field Potential | 8 pages, no figure, to publish in JCAP | JCAP 0802:002,2008 | 10.1088/1475-7516/2008/02/002 | null | astro-ph | null | In this paper, we have studied the spectrum of curvature perturbation of
multi-field inflation with general small-field potential. We assume that the
isocurvature perturbation may be neglected, and by using the Sasaki-Stewart
formalism, we found that the spectrum may be redder or bluer than of its
corresponding single field. The result depends upon the values of fields and
their effective masses at the horizon-crossing time. We discuss the relevant
cases.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 05:44:25 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ahmad",
"Iftikhar",
""
],
[
"Piao",
"Yun-Song",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | [
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] |
801.313 | Marek Rogatko | Gary W.Gibbons and Marek Rogatko | The Decay of Dirac Hair around a Dilaton Black Hole | RevTex, 8 pages, to be published in Phys.Rev.D15 | Phys.Rev.D77:044034,2008 | 10.1103/PhysRevD.77.044034 | null | hep-th gr-qc | null | The intermediate and late-time behaviour of a massive Dirac field in the
background of static spherically symmetric black hole solutions is
investigated. The intermediate asymptotic behaviour of a massive Dirac field
depends on the mass parameter as well as the wave number of the mode, while the
late time behaviour has a power law decay rate independent of both.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 05:48:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gibbons",
"Gary W.",
""
],
[
"Rogatko",
"Marek",
""
]
] | [
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] |
801.3131 | Yasuro Funaki | Y. Funaki, H. Horiuchi, G. R\"opke, P. Schuck, A. Tohsaki, T. Yamada | Density-induced suppression of the alpha-particle condensate in nuclear
matter and the structure of alpha cluster states in nuclei | 7 pages, 3 figure, submitted to Phys. Rev. C | Phys.Rev.C77:064312,2008 | 10.1103/PhysRevC.77.064312 | null | nucl-th | null | At low densities, with decreasing temperatures, in symmetric nuclear matter
alpha-particles are formed, which eventually give raise to a quantum condensate
with four-nucleon alpha-like correlations (quartetting). Starting with a model
of alpha-matter, where undistorted alpha particles interact via an effective
interaction such as the Ali-Bodmer potential, the suppression of the condensate
fraction at zero temperature with increasing density is considered. Using a
Jastrow-Feenberg approach, it is found that the condensate fraction vanishes
near saturation density. Additionally, the modification of the internal state
of the alpha particle due to medium effects will further reduce the condensate.
In finite systems, an enhancement of the S state wave function of the c.o.m.
orbital of alpha particle motion is considered as the correspondence to the
condensate. Wave functions have been constructed for self-conjugate 4n nuclei
which describe the condensate state, but are fully antisymmetrized on the
nucleonic level. These condensate-like cluster wave functions have been
successfully applied to describe properties of low-density states near the n
alpha threshold. Comparison with OCM calculations in 12C and 16O shows strong
enhancement of the occupation of the S-state c.o.m. orbital of the
alpha-particles. This enhancement is decreasing if the baryon density
increases, similar to the density-induced suppression of the condensate
fraction in alpha matter. The ground states of 12C and 16O show no enhancement
at all, thus a quartetting condensate cannot be formed at saturation densities.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 06:15:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Funaki",
"Y.",
""
],
[
"Horiuchi",
"H.",
""
],
[
"Röpke",
"G.",
""
],
[
"Schuck",
"P.",
""
],
[
"Tohsaki",
"A.",
""
],
[
"Yamada",
"T.",
""
]
] | [
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] |
801.3132 | Changzheng Yuan | Yuan Chang-Zheng | Study of Charmonium(-like) States via ISR at Belle | Talk given at the BES-Belle-CLEO-BaBar Joint Workshop on Charm
Physics, Beijing, Chnia, November 26-27, 2007 | null | null | null | hep-ex | null | The cross sections for e+e- to pi+pi-J/psi, pi+pi-psi(2S), K+K-J/psi, DDbar,
DDbar pi, D*Dbar, and D*D*bar are measured using data sample collected on or
near the Upsilon(4S) resonance with the Belle detector at KEKB. A peak near
4.25 GeV/c^2, corresponding to the so called Y(4260), is observed in
pi+pi-J/psi final state. In addition, there is another cluster of events at
around 4.05 GeV/c^2. Two resonant structures are observed in the pi+pi-psi(2S)
invariant mass distribution, one at 4361+-9+-9 MeV/c^2 with a width of
74+-15+-10 MeV/c^2, and another at 4664+-11+-5 MeV/c^2 with a width of
48+-15+-3 MeV/c^2. The rich structures observed in all these final states
indicate that our understanding of the vector charmonium states above the open
charm threshold is still poor, let alone the other possible dynamics such as
charmonium hybrids or final state re-scattering and so on.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 06:16:59 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Chang-Zheng",
"Yuan",
""
]
] | [
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801.3133 | Mordehai Milgrom | Mordehai Milgrom (Weizmann Institute) | The MOND paradigm | 26 pages, 8 figures. Talk presented at the XIX Rencontres de Blois
"Matter and energy in the Universe: from nucleosynthesis to cosmology", May
2007 | null | null | null | astro-ph gr-qc hep-ph | null | I review briefly different aspects of the MOND paradigm, with emphasis on
phenomenology, epitomized here by many MOND laws of galactic motion--analogous
to Kepler's laws of planetary motion. I then comment on the possible roots of
MOND in cosmology, possibly the deepest and most far reaching aspect of MOND.
This is followed by a succinct account of existing underlying theories. I also
reflect on the implications of MOND's successes for the dark matter (DM)
paradigm: MOND predictions imply that baryons alone accurately determine the
full field of each and every individual galactic object. This conflicts with
the expectations in the DM paradigm because of the haphazard formation and
evolution of galactic objects and the very different influences that baryons
and DM are subject to during the evolution, as evidenced, e.g., by the very
small baryon-to-DM fraction in galaxies (compared with the cosmic value). All
this should disabuse DM advocates of the thought that DM will someday be able
to reproduce MOND: It is inconceivable that the modicum of baryons left over in
galaxies can be made to determine everything if a much heavier DM component is
present.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 06:20:23 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 10:42:26 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Milgrom",
"Mordehai",
"",
"Weizmann Institute"
]
] | [
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] |
801.3134 | Subir Ghosh | Subir Ghosh (Indian Statistical Institute, India) | Comment on Magnetic Monopole Excitations in Spin Ice | 4 pages, laTex | null | null | null | cond-mat.str-el hep-th quant-ph | null | It has been proposed recently \cite{son} that excitations in Spin Ice can be
of the form of magnetic monopoles that does not obey the Dirac Quantization
Condition. It is also well known \cite{rj} that the above scenario leads to
non-associativity among translation generators. It will be interesting to see
how the monopole picture in Spin Ice survives in the light of the latter
observation.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 06:36:10 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Ghosh",
"Subir",
"",
"Indian Statistical Institute, India"
]
] | [
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] |
801.3135 | Shuai Wang | Shuai Wang, Yuan Xu, Ke Xia | First principles study on the spin transfer torques | 10 pages,10 figures | null | null | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | An efficient first principles method was developed to calculate spin transfer
torques in layered system with noncollinear magnetization. The complete
scattering wave function is determined by matching the wave function in the
scattering region with the Bloch states in the leads. The spin transfer torques
are obtained with aid of the scattering wave function. We applied our method to
the ferromagnetic spin valve and found that the material (Co, Ni and Ni80Fe20)
dependence of the spin transfer torques could be well understood by the Fermi
surface. Ni has much longer spin injection penetration length than Co.
Interfacial disorder is also considered. It is found that the spin transfer
torques could be enhanced by the interfacial disorder in some system.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 06:45:52 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Wang",
"Shuai",
""
],
[
"Xu",
"Yuan",
""
],
[
"Xia",
"Ke",
""
]
] | [
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801.3136 | Murat Cetinbas | Murat Cetinbas and Joshua Wilkie | Manifold algorithmic errors in quantum computers with static internal
imperfections | null | J. Phys. A: Math. Theor. 41 (2008) 065302 | 10.1088/1751-8113/41/6/065302 | null | quant-ph | null | The inevitable existence of static internal imperfections and residual
interactions in some quantum computer architectures result in internal
decoherence, dissipation, and destructive unitary shifts of active algorithms.
By exact numerical simulations we determine the relative importance and origin
of these errors for a Josephson charge qubit quantum computer. In particular we
determine that the dynamics of a CNOT gate interacting with its idle
neighboring qubits via native residual coupling behaves much like a perturbed
kicked top in the exponential decay regime, where fidelity decay is only weakly
dependent on perturbation strength. This means that retroactive removal of gate
errors (whether unitary or non-unitary) may not be possible, and that effective
error correction schemes must operate concurrently with the implementation of
subcomponents of the gate.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 06:42:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cetinbas",
"Murat",
""
],
[
"Wilkie",
"Joshua",
""
]
] | [
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] |
801.3137 | Yusuke Nakamura | Y.Nakamura, M.Mine, M.Okumura, and Y.Yamanaka | Condition for emergence of complex eigenvalues in the Bogoliubov-de
Gennes equations | 7pages | Phys. Rev. A 77, 043601 (2008) | 10.1103/PhysRevA.77.043601 | null | cond-mat.other | null | The condition for the appearance of dynamical instability of the
Bose-condensed system, characterized by the emergence of complex eigenvalues in
the Bogoliubov-de Gennes equations, is studied analytically. We perturbatively
expand both the Gross-Pitaevskii and Bogoliubov-de Gennes equations with
respect to the coupling constant. It is concluded that the degeneracy between a
positive-norm eigenmode and a negative-norm one is essential for the emergence
of complex modes. Based on the conclusion, we justify the two-mode
approximation applied in our previous work [E. Fukuyama \textit{et al}., Phys.
Rev. A {\bf 76}, 043608 (2007)], in which we analytically studied the condition
for the existence of complex modes when the condensate has a highly quantized
vortex.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 07:10:52 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Apr 2008 05:44:12 GMT"
}
] | 2008-04-04T00:00:00 | [
[
"Nakamura",
"Y.",
""
],
[
"Mine",
"M.",
""
],
[
"Okumura",
"M.",
""
],
[
"Yamanaka",
"Y.",
""
]
] | [
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] |
801.3138 | Masanori Sato | Masanori Sato | Single photon Michelson-Morley experiment via de Broglie-Bohm picture:
An interpretation based on the hypothesis of frame dragging | 9 pages, 6 figures | null | null | null | physics.gen-ph | null | The Michelson-Morley experiment is considered via a single photon
interferometer and a hypothesis of the dragging of the permittivity of free
space and permeability of free space. The Michelson-Morley experimental results
can be interpreted using de Broglie-Bohm picture. In the global positioning
system (GPS) experiment, isotropic constancy of the speed of light, c, was
confirmed by direct one way measurement. That is, Michelson-Morley experiments
without interference are confirmed every day; therefore the hypothesis of frame
dragging is a suitable explanation of the Michelson-Morley experimental
results.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 07:11:23 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 08:35:36 GMT"
}
] | 2008-02-28T00:00:00 | [
[
"Sato",
"Masanori",
""
]
] | [
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] |
801.3139 | Refik Inanc Baykur | R. Inanc Baykur | Existence of broken Lefschetz fibrations | 11 pages, 5 figures. Remark 3.4 is updated, and an example of a
broken Lefschetz fibration on the complex projective plane is added | null | null | null | math.GT math.SG | null | We prove that every closed oriented smooth 4-manifold X admits a broken
Lefschetz fibration (aka singular Lefschetz fibration) over the 2-sphere. Given
any closed orientable surface F of square zero in X, we can choose the
fibration so that F is a fiber. Moreover, we can arrange it so that there is
only one Lefschetz critical point when the Euler characteristic e(X) is odd,
and none when e(X) is even. We make use of topological modifications of smooth
maps with fold and cusp singularities due to Saeki and Levine, and thus we get
alternative proofs of previous existence results. Also shown is the existence
of broken Lefschetz pencils with connected fibers on any near-symplectic
4-manifold.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 07:13:06 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 01:31:41 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Baykur",
"R. Inanc",
""
]
] | [
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801.314 | Martin Veselsky | M. Veselsky, A.L. Keksis, G.A. Souliotis, K. Wang, E. Bell, D.V.
Shetty, M. Jandel, S.J. Yennello, Y.G. Ma | Statistical and dynamical aspects in the decay of hot neutron-rich
nuclei | LaTeX, article expanded, 2 figures added, 17 pages, 7 figures | Nucl.Phys.A837:163-175,2010; Int.J.Mod.Phys.E19:1559-1569,2010 | 10.1016/j.nuclphysa.2010.02.013 10.1142/S0218301310015965 | null | nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The signal of isospin-asymmetric phase transition in the evolution of the
chemical potential was observed for hot quasi-projectiles produced in the
reactions 40,48Ca + 27Al confirming an analogous observation in the lighter
system 28Si + 112,124Sn. With increasing mass, the properties of hot
quasi-projectiles become increasingly influenced by the secondary emission.
Thermodynamical observables exhibit no sensitivity to the different number of
missing neutrons in the two reactions 40,48Ca + 27Al, thus providing a signal
of dynamical emission of neutrons, which can be related to formation of a very
neutron-rich low-density region (neck) between the projectile and target.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 09:10:13 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jul 2008 10:19:31 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Veselsky",
"M.",
""
],
[
"Keksis",
"A. L.",
""
],
[
"Souliotis",
"G. A.",
""
],
[
"Wang",
"K.",
""
],
[
"Bell",
"E.",
""
],
[
"Shetty",
"D. V.",
""
],
[
"Jandel",
"M.",
""
],
[
"Yennello",
"S. J.",
""
],
[
"Ma",
"Y. G.",
""
]
] | [
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] |
801.3141 | Mark Wilde | Mark M. Wilde and Bart Kosko | Quantum Forbidden-Interval Theorems for Stochastic Resonance | 13 pages, 2 figures | Journal of Physics A: Mathematical and Theoretical 42, 465309
(2009). | 10.1088/1751-8113/42/46/465309 | null | quant-ph nlin.CD | null | We extend the classical forbidden-interval theorems for a
stochastic-resonance noise benefit in a nonlinear system to a quantum-optical
communication model and a continuous-variable quantum key distribution model.
Each quantum forbidden-interval theorem gives a necessary and sufficient
condition that determines whether stochastic resonance occurs in quantum
communication of classical messages. The quantum theorems apply to any quantum
noise source that has finite variance or that comes from the family of
infinite-variance alpha-stable probability densities. Simulations show the
noise benefits for the basic quantum communication model and the
continuous-variable quantum key distribution model.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 07:21:56 GMT"
}
] | 2009-10-29T00:00:00 | [
[
"Wilde",
"Mark M.",
""
],
[
"Kosko",
"Bart",
""
]
] | [
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] |
801.3142 | Michael Holst | Burak Aksoylu, David Bernstein, Stephen Bond, Michael Holst | Generating Initial Data in General Relativity using Adaptive Finite
Element Methods | 54 pages, 15 figures. Published as LSU CCT Technical Report 2008-09 | null | null | LSU Center for Computation and Technology (CCT) Technical Report
2008-09 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conformal formulation of the Einstein constraint equations is first
reviewed, and we then consider the design, analysis, and implementation of
adaptive multilevel finite element-type numerical methods for the resulting
coupled nonlinear elliptic system. We derive weak formulations of the coupled
constraints, and review some new developments in the solution theory for the
constraints in the cases of constant mean extrinsic curvature (CMC) data,
near-CMC data, and arbitrarily prescribed mean extrinsic curvature data. We
then outline some recent results on a priori and a posteriori error estimates
for a broad class of Galerkin-type approximation methods for this system which
includes techniques such as finite element, wavelet, and spectral methods. We
then use these estimates to construct an adaptive finite element method (AFEM)
for solving this system numerically, and outline some new convergence and
optimality results. We then describe in some detail an implementation of the
methods using the FETK software package, which is an adaptive multilevel finite
element code designed to solve nonlinear elliptic and parabolic systems on
Riemannian manifolds. We finish by describing a simplex mesh generation
algorithm for compact binary objects, and then look at a detailed example
showing the use of FETK for numerical solution of the constraints.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 07:23:52 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 22:28:01 GMT"
},
{
"version": "v3",
"created": "Tue, 7 Apr 2009 14:22:04 GMT"
}
] | 2009-04-07T00:00:00 | [
[
"Aksoylu",
"Burak",
""
],
[
"Bernstein",
"David",
""
],
[
"Bond",
"Stephen",
""
],
[
"Holst",
"Michael",
""
]
] | [
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] |
801.3143 | Gregor Pardella | Gregor Pardella and Frauke Liers | Exact Ground States of Large Two-Dimensional Planar Ising Spin Glasses | 11 pages, 5 figures; shortened introduction, extended results; to
appear in Physical Review E 78 | null | 10.1103/PhysRevE.78.056705 | null | cond-mat.dis-nn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Studying spin-glass physics through analyzing their ground-state properties
has a long history. Although there exist polynomial-time algorithms for the
two-dimensional planar case, where the problem of finding ground states is
transformed to a minimum-weight perfect matching problem, the reachable system
sizes have been limited both by the needed CPU time and by memory requirements.
In this work, we present an algorithm for the calculation of exact ground
states for two-dimensional Ising spin glasses with free boundary conditions in
at least one direction. The algorithmic foundations of the method date back to
the work of Kasteleyn from the 1960s for computing the complete partition
function of the Ising model. Using Kasteleyn cities, we calculate exact ground
states for huge two-dimensional planar Ising spin-glass lattices (up to
3000x3000 spins) within reasonable time. According to our knowledge, these are
the largest sizes currently available. Kasteleyn cities were recently also used
by Thomas and Middleton in the context of extended ground states on the torus.
Moreover, they show that the method can also be used for computing ground
states of planar graphs. Furthermore, we point out that the correctness of
heuristically computed ground states can easily be verified. Finally, we
evaluate the solution quality of heuristic variants of the Bieche et al.
approach.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 07:45:49 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 13:14:32 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Nov 2008 14:39:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pardella",
"Gregor",
""
],
[
"Liers",
"Frauke",
""
]
] | [
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] |
801.3144 | Tian De Cao | Tian De Cao | Prerequisite for superconductivity: appropriate spin-charge correlations | 7pages | Solid State Communications 147 (2008) 4 | 10.1016/j.ssc.2008.04.033 | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work investigates the relation between superconductivity and
correlations. A simple calculation shows that the appropriate spin-charge
correlation is the key role to any superconductivity, and this calculation is
consistent with the analyses of unusual properties of superconductors. (Note:
the Tc of this model is not given clearly in this work, but we have advanced
this mechanism to a t-x model which includes various superconductivities and
magnetisms (please see arXiv:0707.3660 and following works).)
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 07:49:54 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Sep 2008 12:57:42 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"De Cao",
"Tian",
""
]
] | [
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801.3145 | Conrad J. Burden | Conrad J. Burden, Miriam R. Kantorovitz, Susan R. Wilson | Approximate word matches between two random sequences | Published in at http://dx.doi.org/10.1214/07-AAP452 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 1-21 | 10.1214/07-AAP452 | IMS-AAP-AAP452 | math.PR | null | Given two sequences over a finite alphabet $\mathcal{L}$, the $D_2$ statistic
is the number of $m$-letter word matches between the two sequences. This
statistic is used in bioinformatics for expressed sequence tag database
searches. Here we study a generalization of the $D_2$ statistic in the context
of DNA sequences, under the assumption of strand symmetric Bernoulli text. For
$k<m$, we look at the count of $m$-letter word matches with up to $k$
mismatches. For this statistic, we compute the expectation, give upper and
lower bounds for the variance and prove its distribution is asymptotically
normal.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 07:58:24 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Burden",
"Conrad J.",
""
],
[
"Kantorovitz",
"Miriam R.",
""
],
[
"Wilson",
"Susan R.",
""
]
] | [
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] |
801.3146 | H. Panagopoulos | A. Skouroupathis, M. Constantinou and H. Panagopoulos | Two-loop additive mass renormalization with clover fermions and Symanzik
improved gluons | 20 pages, 8 figures, 14 tables. Phys. Rev. D77, Number 1 (2008) | Phys.Rev.D77:014513,2008 | 10.1103/PhysRevD.77.014513 | null | hep-lat | null | We calculate the critical value of the hopping parameter, $\kappa_c$, in
Lattice QCD, up to two loops in perturbation theory. We employ the
Sheikholeslami-Wohlert (clover) improved action for fermions and the Symanzik
improved gluon action with 4- and 6-link loops.
The quantity which we study is a typical case of a vacuum expectation value
resulting in an additive renormalization; as such, it is characterized by a
power (linear) divergence in the lattice spacing, and its calculation lies at
the limits of applicability of perturbation theory.
Our results are polynomial in $c_{SW}$ (clover parameter) and cover a wide
range of values for the Symanzik coefficients $c_i$. The dependence on the
number of colors N and the number of fermion flavors $N_f$ is shown explicitly.
In order to compare our results to non perturbative evaluations of $\kappa_c$
coming from Monte Carlo simulations, we employ an improved perturbation theory
method for improved actions.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:48:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Skouroupathis",
"A.",
""
],
[
"Constantinou",
"M.",
""
],
[
"Panagopoulos",
"H.",
""
]
] | [
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] |
801.3147 | Ke Xu | Liang Li, Xin Li, Tian Liu, Ke Xu | From k-SAT to k-CSP: Two Generalized Algorithms | null | null | null | null | cs.DS cs.AI cs.CC | null | Constraint satisfaction problems (CSPs) models many important intractable
NP-hard problems such as propositional satisfiability problem (SAT). Algorithms
with non-trivial upper bounds on running time for restricted SAT with bounded
clause length k (k-SAT) can be classified into three styles: DPLL-like,
PPSZ-like and Local Search, with local search algorithms having already been
generalized to CSP with bounded constraint arity k (k-CSP). We generalize a
DPLL-like algorithm in its simplest form and a PPSZ-like algorithm from k-SAT
to k-CSP. As far as we know, this is the first attempt to use PPSZ-like
strategy to solve k-CSP, and before little work has been focused on the
DPLL-like or PPSZ-like strategies for k-CSP.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 08:07:33 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Li",
"Liang",
""
],
[
"Li",
"Xin",
""
],
[
"Liu",
"Tian",
""
],
[
"Xu",
"Ke",
""
]
] | [
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] |
801.3148 | Wanjing Wang | Wan-Jing Wang, Kai-Wei Yang, Xue-Bang Wu, Yu-Bing Wang, and Zhen-Gang
Zhu | Structural transition of force chains observed by mechanical
spectroscopy | null | null | null | null | cond-mat.soft cond-mat.other | null | The dissipation properties of a fine sand system are investigated by a
low-frequency mechanical spectroscopy. The experiments show many interesting
profiles of the relative energy dissipation, which imply that some structural
transition of force chains in dense granular media has occurred. The following
data and discussion indicate that the transition of force chains will lead to
the small deformation of arrangement in the granular system, which is
responsible for the historical effects. We hope this research can improve our
knowledge of the microstructure of the granular materials.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 08:26:27 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Wang",
"Wan-Jing",
""
],
[
"Yang",
"Kai-Wei",
""
],
[
"Wu",
"Xue-Bang",
""
],
[
"Wang",
"Yu-Bing",
""
],
[
"Zhu",
"Zhen-Gang",
""
]
] | [
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0.0169882383,
0.0017033755,
-0.062687017
] |
801.3149 | Aleksandar Gjurchinovski | Aleksandar Gjurchinovski | Is the phase of plane waves a frame-independent quantity? | 4 pages, 5 figures, REVTeX | null | null | null | physics.optics physics.class-ph | null | The invariance of the phase of plane waves among inertial frames is
investigated in some details. The reason that eventually led the author of a
recent EPL letter [EPL \textbf{79}, 1006 (2007)] to a spurious conclusion of
the non-invariance of the phase of waves has been identified -- it is the
ignorance of the effect of relativistically-induced optical anisotropy in the
analysis of the problem. It is argued that the Lorentz-invariant expression for
the phase of waves should be taken in the form $\Phi=\mathbf{k\cdot
r}-\mathbf{k\cdot u}/c$, instead of the widely-used expression
$\Phi=\mathbf{k\cdot r}-\omega t$ which has a limited validity.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 08:44:34 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2008 08:58:05 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Gjurchinovski",
"Aleksandar",
""
]
] | [
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] |
801.315 | Miguel-Angel Perez-Torres | MAGIC Collaboration: J. Albert, et al | Multi-wavelength (radio, X-ray and gamma-ray) observations of the
gamma-ray binary LS I +61 303 | Accepted for publication in The Astrophysical Journal, Part 1; 8
pages, 7 figures | Astrophys.J.684:1351-1358,2008 | 10.1086/590332 | null | astro-ph | null | We present the results of the first multiwavelength observing campaign on the
high-mass X-ray binary LS I +61 303 comprising observations at the TeV regime
with the MAGIC telescope, along with X-ray observations with Chandra, and radio
interferometric observations with the MERLIN, EVN and VLBA arrays, in October
and November 2006. From our MERLIN observations, we can exclude the existence
of large scale (~100 mas) persistent radio-jets. Our 5.0 GHz VLBA observations
display morphological similarities to previous 8.4 GHz VLBA observations
carried out at the same orbital phase, suggesting a high level of periodicity
and stability of the processes behind the radio emission. This makes it
unlikely that variability of the radio emission is due to the interaction of an
outflow with variable wind clumps. If the radio emission is produced by a
milliarcsecond scale jet, it should also show a stable, periodic behavior. It
is then difficult to reconcile the absence of a large scale jet (~100 mas) in
our observations with the evidence of a persistent relativistic jet reported
previously. We find a possible hint of temporal correlation between the X-ray
and TeV emissions and evidence for radio/TeV non-correlation, which points to
the existence of one population of particles producing the radio emission and a
different one producing the X-ray and TeV emissions. Finally, we present a
quasi-simultaneous energy spectrum including radio, X-ray and TeV bands.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 11:50:07 GMT"
},
{
"version": "v2",
"created": "Wed, 21 May 2008 14:25:51 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"MAGIC Collaboration",
"",
""
],
[
"Albert",
"J.",
""
]
] | [
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801.3151 | Tatjana Zivkovic | Tatjana Zivkovic and Kristoffer Rypdal | Evidence of low-dimensional chaos in magnetized plasma turbulence | null | null | 10.1140/epjst/e2008-00841-5 | null | physics.plasm-ph | null | We analyze probe data obtained from a toroidal magnetized plasma
configuration suitable for studies of low-frequency gradient-driven
instabilities. These instabilities give rise to field-aligned convection rolls
analogous to Rayleigh-Benard cells in neutral fluids, and may theoretically
develop similar routes to chaos. When using mean-field dimension analysis, we
observe low dimensionality, but this could originate from either
low-dimensional chaos, periodicity or quasi-periodicity. Therefore, we apply
recurrence plot analysis as well as estimation of the largest Lyapunov
exponent. These analyses provide evidence of low-dimensional chaos, in
agreement with theoretical predictions.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 09:27:52 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Mar 2008 08:41:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zivkovic",
"Tatjana",
""
],
[
"Rypdal",
"Kristoffer",
""
]
] | [
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] |
801.3152 | Klaus Doll | K. Doll | Electronic structure of GdN, and the influence of exact exchange | to appear in J. Phys.: Condensed Matter | null | 10.1088/0953-8984/20/7/075214 | null | cond-mat.mtrl-sci | null | GdN bulk is studied with the local density approximation, on the Hartree-Fock
level, and on the level of the hybrid functional B3LYP. A local basis set
formalism is used, as implemented in the present CRYSTAL06 release. It is
demonstrated that the code is technically capable of treating this system with
its 4f electrons explicitly, i.e. out of the core. The band structure at the
level of the local density approximation is in good agreement with earlier
calculations and is found to be half-metallic. The Hartree-Fock band structure
is insulating with a large gap. Interestingly, three solutions were found at
the B3LYP level. The lowest of them is insulating for majority spin, and the
Fermi surface for minority spin consists only of points, resulting in a very
low density of states around the Fermi level.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 09:29:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Doll",
"K.",
""
]
] | [
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801.3153 | Alessandra Bertapelle | Alessandra Bertapelle | Remarks on 1-motivic sheaves | 14 pages. Shortened, corrected version. Results on Laumon 1-motives
will appear in another paper | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the construction of the category of 1-motives with torsion
${}^tM_1$ (introduced by Barbieri-Viale, Rosenschon and Saito) as well as the
construction of the category of 1-motivic sheaves ${\rm Shv}_1$ (defined by
Barbieri-Viale and Kahn) to perfect fields $k$ (without inverting the
exponential characteristic). For $k$ transcendental over the prime field we
extend a result of Barbieri-Viale and Kahn, showing that ${}^tM$ and ${\rm
Shv}_1$ have equivalent bounded derived categories.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 09:39:27 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Sep 2010 09:56:18 GMT"
},
{
"version": "v3",
"created": "Thu, 24 May 2012 09:29:37 GMT"
}
] | 2012-05-25T00:00:00 | [
[
"Bertapelle",
"Alessandra",
""
]
] | [
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] |
801.3154 | Anna Minguzzi | G. Ferrini, A. Minguzzi, F.W.J. Hekking (UJF-CNRS Grenoble) | Number squeezing, quantum fluctuations and oscillations in mesoscopic
Bose Josephson junctions | 4 pages, 3 figures | null | 10.1103/PhysRevA.78.023606 | null | cond-mat.mes-hall | null | Starting from a quantum two-mode Bose-Hubbard Hamiltonian we determine the
ground state properties, momentum distribution and dynamical evolution for a
Bose Josephson junction realized by an ultracold Bose gas in a double-well
trap. Varying the well asymmetry we identify Mott-like regions of parameters
where number fluctuations are suppressed and the interference fringes in the
momentum distribution are strongly reduced. We also show how Schroedinger cat
states, realized from an initially phase coherent state by a sudden rise of the
barrier among the two wells, will give rise to a destructive interference in
the time-dependent momentum distribution.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 16:53:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ferrini",
"G.",
"",
"UJF-CNRS Grenoble"
],
[
"Minguzzi",
"A.",
"",
"UJF-CNRS Grenoble"
],
[
"Hekking",
"F. W. J.",
"",
"UJF-CNRS Grenoble"
]
] | [
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] |
801.3155 | Tom Meyerovitch | Elise Janvresse, Tom Meyerovitch, Emmanuel Roy and Thierry De La Rue | Poisson suspensions and entropy for infinite transformations | 25 pages, a final section with some more results and questions added | null | null | null | math.DS math.PR | null | The Poisson entropy of an infinite-measure-preserving transformation is
defined as the Kolmogorov entropy of its Poisson suspension. In this article,
we relate Poisson entropy with other definitions of entropy for infinite
transformations: For quasi-finite transformations we prove that Poisson entropy
coincides with Krengel's and Parry's entropy. In particular, this implies that
for null-recurrent Markov chains, the usual formula for the entropy $-\sum q_i
p_{i,j}\log p_{i,j}$ holds in any of the definitions for entropy. Poisson
entropy dominates Parry's entropy in any conservative transformation. We also
prove that relative entropy (in the sense of Danilenko and Rudolph) coincides
with the relative Poisson entropy. Thus, for any factor of a conservative
transformation, difference of the Krengel's entropy is equal to the difference
of the Poisson entropies. In case there exists a factor with zero Poisson
entropy, we prove the existence of a maximum (Pinsker) factor with zero Poisson
entropy. Together with the preceding results, this answers affirmatively the
question raised in arXiv:0705.2148v3 about existence of a Pinsker factor in the
sense of Krengel for quasi-finite transformations.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:00:02 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 09:20:00 GMT"
}
] | 2008-03-19T00:00:00 | [
[
"Janvresse",
"Elise",
""
],
[
"Meyerovitch",
"Tom",
""
],
[
"Roy",
"Emmanuel",
""
],
[
"De La Rue",
"Thierry",
""
]
] | [
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] |
801.3156 | Masatomo Iwasa | Masatomo Iwasa and Kazuhiro Nozaki | Renormalization group in difference systems | Accepted to J. Phys. A, 7 pages | null | 10.1088/1751-8113/41/8/085204 | null | nlin.CD cond-mat.other | null | A new singular perturbation method based on the Lie symmetry group is
presented to a system of difference equations. This method yields consistent
derivation of a renormalization group equation which gives an asymptotic
solution of the difference equation. The renormalization group equation is a
Lie differential equation of a Lie group which leaves the system approximately
invariant. For a 2-D symplectic map, the renormalization group equation becomes
a Hamiltonian system and a long-time behaviour of the symplectic map is
described by the Hamiltonian. We study the Poincar\'e-Birkoff bifurcation in
the 2-D symplectic map by means of the Hamiltonian and give a condition for the
bifurcation.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:00:29 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jan 2008 06:09:14 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Feb 2008 05:22:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iwasa",
"Masatomo",
""
],
[
"Nozaki",
"Kazuhiro",
""
]
] | [
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] |
801.3157 | - Departement Mathematiques Orsay | Patricia Reynaud-Bouret (DMA), Vincent Rivoirard (LM-Orsay) | Adaptive thresholding estimation of a Poisson intensity with infinite
support | null | null | null | null | math.ST stat.TH | null | The purpose of this paper is to estimate the intensity of a Poisson process
$N$ by using thresholding rules. In this paper, the intensity, defined as the
derivative of the mean measure of $N$ with respect to $ndx$ where $n$ is a
fixed parameter, is assumed to be non-compactly supported. The estimator
$\tilde{f}_{n,\gamma}$ based on random thresholds is proved to achieve the same
performance as the oracle estimator up to a logarithmic term. Oracle
inequalities allow to derive the maxiset of $\tilde{f}_{n,\gamma}$. Then,
minimax properties of $\tilde{f}_{n,\gamma}$ are established. We first prove
that the rate of this estimator on Besov spaces ${\cal B}^\al_{p,q}$ when
$p\leq 2$ is $(\ln(n)/n)^{\al/(1+2\al)}$. This result has two consequences.
First, it establishes that the minimax rate of Besov spaces ${\cal
B}^\al_{p,q}$ with $p\leq 2$ when non compactly supported functions are
considered is the same as for compactly supported functions up to a logarithmic
term. This result is new. Furthermore, $\tilde{f}_{n,\gamma}$ is adaptive
minimax up to a logarithmic term. When $p>2$, the situation changes
dramatically and the rate of $\tilde{f}_{n,\gamma}$ on Besov spaces ${\cal
B}^\al_{p,q}$ is worse than $(\ln(n)/n)^{\al/(1+2\al)}$. Finally, the random
threshold depends on a parameter $\gamma$ that has to be suitably chosen in
practice. Some theoretical results provide upper and lower bounds of $\gamma$
to obtain satisfying oracle inequalities. Simulations reinforce these results.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:14:25 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Reynaud-Bouret",
"Patricia",
"",
"DMA"
],
[
"Rivoirard",
"Vincent",
"",
"LM-Orsay"
]
] | [
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] |
801.3158 | Nicolas Vanhaecke | Nicolas Vanhaecke (LAC), Olivier Dulieu (LAC) | Precision measurements with polar molecules: the role of the black body
radiation | null | Molecular Physics 105, 11-12 (2007) 1723-1731 | 10.1080/00268970701466261 | null | physics.atom-ph physics.chem-ph | null | In the perspective of the outstanding developments of high-precision
measurements of fundamental constants using polar molecules related to ultimate
checks of fundamental theories, we investigate the possibly counterproductive
role of black-body radiation on a series of diatomic molecules which would be
trapped and observed for long durations. We show that the absorption of
black-body radiation at room temperature may indeed limit the lifetime of
trapped molecules prepared in a well-defined quantum state. Several examples
are treated, corresponding to pure rotational absorption, pure vibrational
absorption or both. We also investigate the role of a black-body
radiation-induced energy shift on molecular levels and how it could affect
high-precision frequency measurements.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:15:26 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Vanhaecke",
"Nicolas",
"",
"LAC"
],
[
"Dulieu",
"Olivier",
"",
"LAC"
]
] | [
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] |
801.3159 | Poh-Boon Phua | B. C. Lim, P. B. Phua, W. J. Lai and M. H. Hong | Fast switchable electro-optic radial polarization retarder | Submit for publication | null | 10.1364/OL.33.000950 | null | physics.optics physics.gen-ph | null | A fast, switchable electro-optic radial polarization retarder (EO-RPR)
fabricated using the electro-optic ceramic PMN-PT is presented. This EO-RPR is
useful for fast, switchable generation of pure cylindrical vector beam. When
used together with a pair of half-wave plates, the EO-RPR can change circularly
polarized light into any cylindrical vector beam of interest such as radially
or azimuthally polarized light. Radially and azimuthally polarized light with
purities greater than 95% are generated experimentally. The advantages of using
EO-RPR include fast response times, low driving voltage and transparency in a
wide spectral range (500 -7000 nm).
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:20:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lim",
"B. C.",
""
],
[
"Phua",
"P. B.",
""
],
[
"Lai",
"W. J.",
""
],
[
"Hong",
"M. H.",
""
]
] | [
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] |
801.316 | Zhicheng Zhong | Zhicheng Zhong and Paul J. Kelly | Electronic structure induced reconstruction and magnetic ordering at the
LaAlO$_3|$SrTiO$_3$ interface | null | EPL, 84, 27001 (2008) | 10.1209/0295-5075/84/27001 | null | cond-mat.mtrl-sci cond-mat.str-el | null | Using local density approximation (LDA) calculations we predict
GdFeO$_3$-like rotation of TiO$_6$ octahedra at the $n$-type interface between
LaAlO$_3$ and SrTiO$_3$. The narrowing of the Ti $d$ bandwidth which results
means that for very modest values of $U$, LDA$+U$ calculations predict charge
and spin ordering at the interface. Recent experimental evidence for magnetic
interface ordering may be understood in terms of the close proximity of an
antiferromagnetic insulating ground state to a ferromagnetic metallic excited
state.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 11:30:51 GMT"
}
] | 2008-09-10T00:00:00 | [
[
"Zhong",
"Zhicheng",
""
],
[
"Kelly",
"Paul J.",
""
]
] | [
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] |
801.3161 | Didier Felbacq | B. Guizal, D. Felbacq, R. Sma\^ali | Beam propagation in finite size photonic crystals and metamaterials | submitted to Phys. Rev. E | null | null | null | cond-mat.mtrl-sci | null | The recent interest in the imaging possibilities of photonic crystals
(superlensing, superprism, optical mirages etc...) call for a detailed analysis
of beam propagation inside a finite periodic structure. In this paper, an
answer to the question "where does the beam emerge?" is given. Contrarily to
common knowledge, it is not always true that the shift of a beam is given by
the normal to the dispersion curve. This phenomenon is explained in terms of
evanescent waves and a renormalized diagram that gives the correct direction is
given.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:22:25 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Guizal",
"B.",
""
],
[
"Felbacq",
"D.",
""
],
[
"Smaâli",
"R.",
""
]
] | [
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801.3162 | Henri Gouin | Henri Gouin (MSNMGP, LMMT) | The wetting problem of fluids on solid surfaces: Dynamics of lines and
contact angle hysteresis | 8 pages | Journal de Physique IV Colloque 11, PR6 (2001) 261-269 | null | null | physics.class-ph | null | In 1805, Young was the first who introduced an expression for contact angle
in static, but today, the motion of the contact-line formed at the intersection
of two immiscible fluids and a solid is still subject to dispute. By means of
the new physical concept of line viscosity, the equations of motions and
boundary conditions for fluids in contact on a solid surface together with
interface and contact-line are revisited. A new Young-Dupr\'e equation for the
dynamic contact angle is deduced. The interfacial energies between fluids and
solid take into account the chemical heterogeneities and the solid surface
roughness. A scaling analysis of the microscopic law associated with the
Young-Dupr\'e dynamic equation allows us to obtain a new macroscopic equation
for the motion of the contact-line. Here we show that our theoretical
predictions fit perfectly together with the contact angle hysteresis phenomenon
and the experimentally well-known results expressing the dependence of the
dynamic contact angle on the celerity of the contact-line. We additively get a
quantitative explanation for the maximum speed of wetting (and dewetting).
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:25:52 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Gouin",
"Henri",
"",
"MSNMGP, LMMT"
]
] | [
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] |
801.3163 | Ingemar Bengtsson | Stefan Aminneborg, Ingemar Bengtsson | Anti-de Sitter Quotients: When Are They Black Holes? | 16 pages, 4 figures; minor polish added | Class.Quant.Grav.25:095019,2008 | 10.1088/0264-9381/25/9/095019 | null | gr-qc hep-th | null | We point out that the BTZ black holes, and their relatives, can be defined in
a cleaner way than they originally were. The covering space can be taken to be
anti-de Sitter space, period, while scri splits up into components due to
Misner singularities. Our definition permits us to choose between two
conflicting claims concerning BTZ black holes in 3+1 dimensions.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:26:55 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Apr 2008 08:19:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aminneborg",
"Stefan",
""
],
[
"Bengtsson",
"Ingemar",
""
]
] | [
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] |
801.3164 | Hamzeh Alavirad | H. Alavirad and N. Riazi | Dark Energy From Fifth Dimension | null | null | null | null | hep-th | null | Observational evidence for the existence of dark energy is strong. Here we
suggest a model which is based on a modified gravitational theory in 5D and
interpret the 5th dimension as a manifestation of dark energy in the 4D
observable universe. We also obtain an equation of state parameter which varies
with time. Finally, we match our model with observations by choosing the free
parameters of the model.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:27:44 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Alavirad",
"H.",
""
],
[
"Riazi",
"N.",
""
]
] | [
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] |
801.3165 | Isabel Caballero | K.Postnov, R.Staubert, A.Santangelo, D.Klochkov, P.Kretschmar,
I.Caballero | The appearance of magnetospheric instability in flaring activity at the
onset of X-ray outbursts in A0535+26 | 4 pages, 1 figure, accepted for publication in A&A Letters. To be
published in parallel to Caballero et al. 2008 | null | 10.1051/0004-6361:20079277 | null | astro-ph | null | We argue that X-ray flaring variability observed in the transient X-ray
pulsar A 0535+26 is due to low-mode magnetospheric instability. This
instability develops at the onset of accretion, in the thin boundary layer
between the accretion disk and neutron star magnetosphere. As a result, the
matter collected in the boundary layer can rapidly fall onto the NS surface
close to the magnetic poles, but not exactly along the field lines by which the
stationary accretion proceeds. This explains the shift in cyclotron line energy
measured using RXTE data in a pre-outburst spike, with respect to the line
energy observed during the main outburst. Furthermore, the instability can
account for the difference in pulse profiles, and their energy evolution that
is different in the pre-outburst flare and main outburst.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:40:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Postnov",
"K.",
""
],
[
"Staubert",
"R.",
""
],
[
"Santangelo",
"A.",
""
],
[
"Klochkov",
"D.",
""
],
[
"Kretschmar",
"P.",
""
],
[
"Caballero",
"I.",
""
]
] | [
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] |
801.3166 | Xavier Caruso | Xavier Caruso (IRMAR), David Savitt | Polygones de Hodge, de Newton et de l'inertie mod\'er\'ee des
repr\'esentations semi-stables | 21 pages | null | null | null | math.NT | null | Let k be a perfect field, and K be a totally ramified extension of K_0 = Frac
W(k) of degree e. To a semi-stable p-adic representation of G_K (the absolute
Galois group of K), one can classicaly associate two polygons : the Hodge
polygon et the Newton polygon. It is well known that the former lies below the
latter, and that they have same endpoints. In this note, we introduce a third
polygon gotten from the semi-simplification of the representation mod p, and,
under some conditions on Hodge-Tate weights, we prove that it lies above the
Hodge polygon again with same endpoint. We finally examine one exemple
associated to a crystalline representation.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:43:45 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jun 2008 12:09:31 GMT"
}
] | 2008-06-13T00:00:00 | [
[
"Caruso",
"Xavier",
"",
"IRMAR"
],
[
"Savitt",
"David",
""
]
] | [
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] |
801.3167 | Isabel Caballero | I.Caballero, A.Santangelo, P.Kretschmar, R.Staubert, K.Postnov,
D.Klochkov, A.Camero-Arranz, M.H.Finger, I.Kreykenbohm, K.Pottschmidt,
R.E.Rothschild, S.Suchy, J.Wilms, C.A.Wilson | The pre-outburst flare of the A 0535+26 August/September 2005 outburst | 4 pages, 4 figures, accepted for publication in A&A Letters. To be
published in parallel to Postnov et al. 2008 | null | 10.1051/0004-6361:20079310 | null | astro-ph | null | We study the spectral and temporal behavior of the High Mass X-ray Binary A
0535+26 during a `pre-outburst flare' which took place ~5 d before the peak of
a normal (type I) outburst in August/September 2005. We compare the studied
behavior with that observed during the outburst. We analyse RXTE observations
that monitored A 0535+26 during the outburst. We complete spectral and timing
analyses of the data. We study the evolution of the pulse period, present
energy-dependent pulse profiles both at the initial pre-outburst flare and
close to outburst maximum, and measure how the cyclotron resonance-scattering
feature (hereafter CRSF) evolves. We present three main results: a constant
period P=103.3960(5)s is measured until periastron passage, followed by a
spin-up with a decreasing period derivative of Pdot=(-1.69+/-0.04)x10^(-8)s/s
at MJD 53618, and P remains constant again at the end of the main outburst. The
spin-up provides evidence for the existence of an accretion disk during the
normal outburst. We measure a CRSF energy of Ecyc~50kev during the pre-outburst
flare, and Ecyc~46kev during the main outburst. The pulse shape, which varies
significantly during both pre-outburst flare and main outburst, evolves
strongly with photon energy.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:44:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Caballero",
"I.",
""
],
[
"Santangelo",
"A.",
""
],
[
"Kretschmar",
"P.",
""
],
[
"Staubert",
"R.",
""
],
[
"Postnov",
"K.",
""
],
[
"Klochkov",
"D.",
""
],
[
"Camero-Arranz",
"A.",
""
],
[
"Finger",
"M. H.",
""
],
[
"Kreykenbohm",
"I.",
""
],
[
"Pottschmidt",
"K.",
""
],
[
"Rothschild",
"R. E.",
""
],
[
"Suchy",
"S.",
""
],
[
"Wilms",
"J.",
""
],
[
"Wilson",
"C. A.",
""
]
] | [
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801.3168 | Vyacheslav Yukalov | V.I. Yukalov | Representative statistical ensembles for Bose systems with broken gauge
symmetry | 43 pages, Latex file | Ann. Phys. 323 (2008) 461-499 | 10.1016/j.aop.2007.05.003 | null | cond-mat.stat-mech hep-ph | null | Bose-condensed systems with broken global gauge symmetry are considered. The
description of these systems, as has been shown by Hohenberg and Martin,
possesses an internal inconsistency, resulting in either nonconserving theories
or yielding an unphysical gap in the spectrum. The general notion of
representative statistical ensembles is formulated for arbitrary statistical
systems, equilibrium or not. The principal idea of this notion is the necessity
of taking into account all imposed conditions that uniquely define the given
statistical system. Employing such a representative ensemble for Bose-condensed
systems removes all paradoxes, yielding a completely self-consistent theory,
both conserving and gapless in any approximation. This is illustrated for an
equilibrium uniform Bose system.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:45:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yukalov",
"V. I.",
""
]
] | [
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] |
801.3169 | Juhan Kim Dr. | Juhan Kim, Changbom Park, Yun-Young Choi | A Subhalo-Galaxy Correspondence Model of Galaxy Formation | 11 pages, 13 figures, submitted to ApJ | null | 10.1086/589566 | null | astro-ph | null | We propose a model of allocating galaxies in cosmological N-body simulations.
we identify each subhalo with a galaxy, and assign luminosity and morphological
type assuming that the galaxy luminosity is a monotonic function of its host
subhalo mass. The morphology assignment is made by using two simple relations
between subhalo mass and galaxy luminosity of different types. One is using a
constant ratio in luminosity of early (E/SO) and late (S/Irr) type galaxies at
a fixed subhalo mass. And the other assumes that galaxies of different
morphological types but having an equal luminosity have a constant ratio in
their subhalo masses. We made a series of comparisons of the properties of
these simulated galaxies with those of the SDSS galaxies. The resulting
simulated galaxy sample is found to successfully reproduce the observed local
number density distribution except for in high density regions. The luminosity
function is studied as a function of local density. It was found that the
observed luminosity functions in different local density environments are
overall well-reproduced by the simulated galaxies. Discrepancy is found at the
bright end of the luminosity function of early types in the underdense regions
and at the faint end of both morphological types in very high density regions.
A significant fraction of the observed early type galaxies in voids seems to
have undergone a relatively recent star formation and became brighter. The lack
of faint simulated galaxies in dense regions may be due to the strong tidal
force of the central halo which destroys less massive satellite subhalos around
in the simulation. The mass-to-light ratio is found to depend on the local
density in the way similar to that observed in the SDSS sample. (abridged)
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:45:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kim",
"Juhan",
""
],
[
"Park",
"Changbom",
""
],
[
"Choi",
"Yun-Young",
""
]
] | [
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] |
801.317 | W.D. van Suijlekom | Walter D. van Suijlekom | Renormalization of gauge fields using Hopf algebras | 16 pages, 1 figure; uses feynmp. To appear in "Recent Developments in
Quantum Field Theory". Eds. B. Fauser, J. Tolksdorf and E. Zeidler.
Birkhauser Verlag, Basel 2008 | null | 10.1007/978-3-7643-8736-5_8 | null | math-ph math.MP | null | We describe the Hopf algebraic structure of Feynman graphs for non-abelian
gauge theories, and prove compatibility of the so-called Slavnov-Taylor
identities with the coproduct. When these identities are taken into account,
the coproduct closes on the Green's functions, which thus generate a Hopf
subalgebra.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 10:50:10 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"van Suijlekom",
"Walter D.",
""
]
] | [
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] |
801.3171 | Tobias Kramer | Tobias Kramer, Eric J. Heller and Robert E. Parrott | An efficient and accurate method to obtain the energy-dependent Green
function for general potentials | 11 pages, to appear in the Journal of Physics: Conference Series
"Time-dependent methods in Quantum Mechanics" | J. Phys.: Conference Series, 99, 012010 (2008) [Open Access] | 10.1088/1742-6596/99/1/012010 | null | cond-mat.mes-hall | null | Time-dependent quantum mechanics provides an intuitive picture of particle
propagation in external fields. Semiclassical methods link the classical
trajectories of particles with their quantum mechanical propagation. Many
analytical results and a variety of numerical methods have been developed to
solve the time-dependent Schroedinger equation. The time-dependent methods work
for nearly arbitrarily shaped potentials, including sources and sinks via
complex-valued potentials. Many quantities are measured at fixed energy, which
is seemingly not well suited for a time-dependent formulation. Very few methods
exist to obtain the energy-dependent Green function for complicated potentials
without resorting to ensemble averages or using certain lead-in arrangements.
Here, we demonstrate in detail a time-dependent approach, which can accurately
and effectively construct the energy-dependent Green function for very general
potentials. The applications of the method are numerous, including chemical,
mesoscopic, and atomic physics.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 14:53:58 GMT"
}
] | 2008-03-07T00:00:00 | [
[
"Kramer",
"Tobias",
""
],
[
"Heller",
"Eric J.",
""
],
[
"Parrott",
"Robert E.",
""
]
] | [
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801.3172 | Hiroyuki Tashiro | Hiroyuki Tashiro, Naoshi Sugiyama | Constraints on Primordial Black Holes by Distortions of Cosmic Microwave
Background | accepted for publication in Phys.Rev.D | Phys.Rev.D78:023004,2008 | 10.1103/PhysRevD.78.023004 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Possible influence of primordial black hole (PBH) evaporations on cosmic
microwave background (CMB) is investigated. The spectrum distortions of CMB
from the black-body spectrum are described by the chemical potential $\mu$ and
the Compton parameter $y$. From COBE/FIRAS limits on $\mu$ and $y$, the power
law index $n$ of primordial density fluctuations and the mass fraction of PBHs
$\beta$ are constrained by employing the peak theory for the formation process
of PBHs. Constraints set here are $n < 1.304$ and $n<1.333$ in the thresholds
of peaks $\zeta_{\rm th} =0.7$ and $\zeta_{\rm th} =1.2$, respectively, for the
PBH mass range between $2.7\times 10^{11}$g and $1.6 \times 10^{12}$g, and $n <
1.312$ and $n<1.343$ in the thresholds of peaks $\zeta_{\rm th} =0.7$ and
$\zeta_{\rm th} =1.2$, respectively, for the PBH mass range between $1.6 \times
10^{12} {\rm g}$ and $3.5\times 10^{13}$g, which correspond to the comoving
scales between $3 \times 10^{-18}$Mpc and $ 4\times 10^{-17}$Mpc. The
constraint on the PBH fraction, which is the direct probe of the amplitude of
density fluctuations in these scales, stays an almost same value as
$\beta<10^{-21}$ in these mass ranges. It is also found that, with these
constraints, UV photons injected by PBH evaporations are unlikely ionize vast
hydrogen atoms after recombination.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 11:46:07 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Jul 2008 14:02:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tashiro",
"Hiroyuki",
""
],
[
"Sugiyama",
"Naoshi",
""
]
] | [
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