Cross-listings
Title: Positronium collapse in hypercritical magnetic field and restructuring
of the vacuum in QED
Authors:
A.E.Shabad,
V.V.Usov
Comments: 31 pages, LATEX requires IOPART
\\The Bethe-Salpeter equation in a strong magnetic field is studied for
positronium atom in an ultra-relativistic regime, and a (hypercritical) value
for the magnetic field is determined, which provides the full compensation of
the positronium rest mass by the binding energy in the maximum symmetry state.
The compensation becomes possible owing to the falling to the center
phenomenon. The relativistic form in two-dimensional Minkowsky space is derived
for the four-dimensional Bethe-Salpeter equation in the limit of an infinitely
strong magnetic field, and used for finding the above hypercritical value. Once
the positronium rest mass is compensated by the mass defect the energy barrier
separating the electron-positron system from the vacuum disappears. We thus
describe the structure of the vacuum in terms of strongly localized states of
tightly mutually bound (or confined) pairs. Their delocalization for still
higher magnetic field, capable of screening its further growth, is discussed.
Title: Heuristic approach to Unusual photon isospin mixing effects on the
thermodynamics of compact nuclear matter
Authors:
Ji-sheng Chen
Comments: RevTex4, 4 pages; Improved with typos corrected
Subj-class: Nuclear Theory; Strongly Correlated Electrons
A hidden (local) symmetry(HLS) formalism with {\em two-photon} approach is
performed based on the effective quantum many-body theory. The possible
electromagnetic(EM) under-screening as well as screening effects between
electric charged point-like electrons and composite protons are discussed by
formally analyzing isospin mixing due to EM photon. The main conclusion is that
the weak repulsive random Coulomb force between like-charged collective
electrons gives a {\em negative} pressure contribution to equation of
state(EOS), an effective {\em attractive} interaction due to modulation factor
of opposite charged fluid background through dragging effects, which is also of
strongly correlating characteristic.
Replacements
Title: Detecting the Earliest Galaxies Through Two New Sources of 21cm
Fluctuations
Authors:
Rennan Barkana (Tel Aviv U.),
Abraham Loeb (Harvard U.)
Comments: 11 pages, 7 figures, ApJ, published. Normalization fixed in top
panels of Figures 4-7
Journal-ref: Astrophys.J. 626 (2005) 1-11
Note: replaced with revised version Fri, 23 Dec 2005 14:31:13 GMT (53kb)
Title: The Cosmological Constant in Brane Cosmology
Authors:
Jia-Zhong Chen,
Duoje Jia
Comments: 6 pages, 1 figure, RevTex 4 form
Note: replaced with revised version Fri, 23 Dec 2005 11:18:24 GMT (28kb)
Title: INTEGRAL observation of the high-mass X-ray transient V0332+53 during
the 2005 outburst decline
Authors:
N. Mowlavi,
I. Kreykenbohm,
S. E. Shaw,
K. Pottschmidt,
J. Wilms,
J. Rodriguez,
N. Produit,
S. Soldi,
S. Larsson,
P. Dubath
Comments: Submitted to A&A: Sept. 21, 2005; accepted: Dec. 14, 2005. 8 pages, 7
figures
Note: replaced with revised version Fri, 23 Dec 2005 14:51:22 GMT (88kb)
Title: A Solution to the Problem of Phaseless Mapping for a High-Orbit
Space-Ground Radio Interferometer
Authors:
Anisa T. Bajkova
Comments: 15 pages, 7 figures
Journal-ref: Astronomy Reports, Vol.49, N 12, 2005, pp.973-983
Note: replaced with revised version Fri, 23 Dec 2005 08:42:45 GMT (363kb)
Title: Detecting a gravitational-wave background with next-generation space
interferometers
Authors:
Hideaki Kudoh,
Atsushi Taruya,
Takashi Hiramatsu,
Yoshiaki Himemoto
Comments: 19 pages, 6 figures, references added, typos corrected
Note: replaced with revised version Fri, 23 Dec 2005 15:01:06 GMT (116kb)
For subscribe options to combined physics archives,
e-mail To: physics@arXiv.org, Subject: subscribe
-----------------------------------------------------------------------------
For help on viewing and making submissions, see this http URL
For a list of archive mirror sites, see this http URL
-----------------------------------------------------------------------------
Third-party submissions cause excessive problems.
Author self-submissions are exceedingly preferred.
E-mail submissions have been discontinued in favor of better support for
Web submissions. See this http URL
Cross-listings
Title: Dark Matter and Gamma-Rays From Draco: MAGIC, GLAST and CACTUS
Authors:
Lars Bergstrom,
Dan Hooper
Comments: 8 pages, 3 figures, 2 tables
The dwarf spheroidal galaxy Draco has long been considered likely to be one
of the brightest point sources of gamma-rays generated through dark matter
annihilations. Recent studies of this object have found that it remains largely
intact from tidal striping, and may be more massive than previously thought. In
this article, we revisit Draco as a source of dark matter annihilation
radiation, with these new observational constraints in mind. We discuss the
prospects for the experiments MAGIC and GLAST to detect dark matter in Draco,
as well as constraints from the observations of EGRET. We also discuss the
possibility that the CACTUS experiment has already detected gamma-rays from
Draco. We find that it is difficult to generate the flux reported by CACTUS
without resorting to non-thermally produced WIMPs and/or a density spike in
Draco's dark matter distribution due to the presence of an intermediate mass
black hole. We also find that for most annihilation modes, a positive detection
of Draco by CACTUS would be inconsistent with the lack of events seen by EGRET.
Title: Density fluctuations of an effectively single field inflation in a
multi-field configuration
Authors:
Masahide Yamaguchi,
Jun'ichi Yokoyama
Comments: 8 pages
We discuss primordial density fluctuations of an effectively single-field
inflation in a multi-field configuration, that is, only one field is light and
the others are heavy. We show that adiabatic density fluctuations of such an
inflation can be completely reproduced by use of a reduced potential of the
light field, which is obtained by inserting the minima of the heavy fields to
the original potential.
Replacements
Title: Evidence for Companion-Induced Secular Changes in the Turbulent Disk of
a Be Star in the LMC MACHO Database
Authors:
Mitchell F. Struble,
Anthony Galatola,
Lorenzo Faccioli,
Charles Alcock,
Kelle Cruz
Comments: 42 pages, 14 figures, and 2 tables Submitted to AJ v3: Title changed,
figures added, model modified
Note: replaced with revised version Mon, 26 Dec 2005 19:55:04 GMT (480kb)
Title: Correspondence Between $5D$ Ricci-Flat Cosmological Models and
Quintessence Dark Energy Models
Authors:
Lixin Xu,
Hongya Liu,
Baorong Chang
Comments: ws-mpla.cls, 10 pages, 4 figures, to be published in MPLA, one
reference added, four eps figures changed
Journal-ref: Mod. Phys. Lett. A, Vol. 20, No. 40 (2005) pp. 3105-3114
Note: replaced with revised version Mon, 26 Dec 2005 08:22:39 GMT (178kb)
Title: Age of High Redshift Objects - a Litmus Test for the Dark Energy Models
Authors:
Deepak Jain,
Abha Dev
Comments: Latex file, Results and Discussion section is modified, more
references added
Note: replaced with revised version Mon, 26 Dec 2005 11:25:01 GMT (101kb)
Title: The Case for Anisotropic Afterglow Efficiency within Gamma-Ray Burst
Jets
Authors:
David Eichler,
Jonathan Granot
Comments: Revised version, submitted to ApJ
Note: replaced with revised version Mon, 26 Dec 2005 10:27:25 GMT (35kb)
Title: Why is the Zel'dovich Approximation so Accurate?
Authors:
A. Yoshisato,
M. Morikawa,
N. Gouda,
H. Mouri
Comments: 16 pages, to appear in The Astrophysical Journal
Note: replaced with revised version Sat, 24 Dec 2005 09:23:42 GMT (102kb)
Title: PSF Anisotropy and Systematic Errors in Weak Lensing Surveys
Authors:
Bhuvnesh Jain,
Mike Jarvis,
Gary Bernstein (U Penn)
Comments: 18 pages, 1 figure; revised submission with minor edits
Note: replaced with revised version Fri, 23 Dec 2005 21:01:07 GMT (22kb)
Title: Ultra High Energy Cosmic Rays from Sequestered X Bursts
Authors:
Peter L. Biermann,
Paul H. Frampton
Comments: 12 pages LaTeX
Note: replaced with revised version Sun, 25 Dec 2005 20:45:47 GMT (13kb)
Title: Stellar masses: the comparison of theoretical predictions and
measurement data
Authors:
B.V.Vasiliev
Note: replaced with revised version Mon, 26 Dec 2005 08:21:05 GMT (96kb)
Title: A size of ~1 AU for the radio source Sgr A* at the centre of the Milky
Way
Authors:
Zhi-Qiang Shen,
K. Y. Lo,
M.-C. Liang,
Paul T. P. Ho,
J.-H. Zhao
Comments: 18 pages, 4 figures
Journal-ref: Nature, 438(2005)62
Note: replaced with revised version Mon, 26 Dec 2005 00:58:43 GMT (199kb)
Title: Confronting mass-varying neutrinos with MiniBooNE
Authors:
V. Barger,
D. Marfatia,
K. Whisnant
Comments: 22 pages, 3 figures, 1 table. Version to appear in PRD
Note: replaced with revised version Fri, 23 Dec 2005 21:42:59 GMT (34kb)
For subscribe options to combined physics archives,
e-mail To: physics@arXiv.org, Subject: subscribe
-----------------------------------------------------------------------------
For help on viewing and making submissions, see this http URL
For a list of archive mirror sites, see this http URL
-----------------------------------------------------------------------------
Third-party submissions cause excessive problems.
Author self-submissions are exceedingly preferred.
E-mail submissions have been discontinued in favor of better support for
Web submissions. See this http URL
Cross-listings
Title: Dark Matter and Gamma-Rays From Draco: MAGIC, GLAST and CACTUS
Authors:
Lars Bergstrom,
Dan Hooper
Comments: 8 pages, 3 figures, 2 tables
The dwarf spheroidal galaxy Draco has long been considered likely to be one
of the brightest point sources of gamma-rays generated through dark matter
annihilations. Recent studies of this object have found that it remains largely
intact from tidal striping, and may be more massive than previously thought. In
this article, we revisit Draco as a source of dark matter annihilation
radiation, with these new observational constraints in mind. We discuss the
prospects for the experiments MAGIC and GLAST to detect dark matter in Draco,
as well as constraints from the observations of EGRET. We also discuss the
possibility that the CACTUS experiment has already detected gamma-rays from
Draco. We find that it is difficult to generate the flux reported by CACTUS
without resorting to non-thermally produced WIMPs and/or a density spike in
Draco's dark matter distribution due to the presence of an intermediate mass
black hole. We also find that for most annihilation modes, a positive detection
of Draco by CACTUS would be inconsistent with the lack of events seen by EGRET.
Title: Density fluctuations of an effectively single field inflation in a
multi-field configuration
Authors:
Masahide Yamaguchi,
Jun'ichi Yokoyama
Comments: 8 pages
We discuss primordial density fluctuations of an effectively single-field
inflation in a multi-field configuration, that is, only one field is light and
the others are heavy. We show that adiabatic density fluctuations of such an
inflation can be completely reproduced by use of a reduced potential of the
light field, which is obtained by inserting the minima of the heavy fields to
the original potential.
Replacements
Title: Evidence for Companion-Induced Secular Changes in the Turbulent Disk of
a Be Star in the LMC MACHO Database
Authors:
Mitchell F. Struble,
Anthony Galatola,
Lorenzo Faccioli,
Charles Alcock,
Kelle Cruz
Comments: 42 pages, 14 figures, and 2 tables Submitted to AJ v3: Title changed,
figures added, model modified
Note: replaced with revised version Mon, 26 Dec 2005 19:55:04 GMT (480kb)
Title: Correspondence Between $5D$ Ricci-Flat Cosmological Models and
Quintessence Dark Energy Models
Authors:
Lixin Xu,
Hongya Liu,
Baorong Chang
Comments: ws-mpla.cls, 10 pages, 4 figures, to be published in MPLA, one
reference added, four eps figures changed
Journal-ref: Mod. Phys. Lett. A, Vol. 20, No. 40 (2005) pp. 3105-3114
Note: replaced with revised version Mon, 26 Dec 2005 08:22:39 GMT (178kb)
Title: Age of High Redshift Objects - a Litmus Test for the Dark Energy Models
Authors:
Deepak Jain,
Abha Dev
Comments: Latex file, Results and Discussion section is modified, more
references added
Note: replaced with revised version Mon, 26 Dec 2005 11:25:01 GMT (101kb)
Title: The Case for Anisotropic Afterglow Efficiency within Gamma-Ray Burst
Jets
Authors:
David Eichler,
Jonathan Granot
Comments: Revised version, submitted to ApJ
Note: replaced with revised version Mon, 26 Dec 2005 10:27:25 GMT (35kb)
Title: Why is the Zel'dovich Approximation so Accurate?
Authors:
A. Yoshisato,
M. Morikawa,
N. Gouda,
H. Mouri
Comments: 16 pages, to appear in The Astrophysical Journal
Note: replaced with revised version Sat, 24 Dec 2005 09:23:42 GMT (102kb)
Title: PSF Anisotropy and Systematic Errors in Weak Lensing Surveys
Authors:
Bhuvnesh Jain,
Mike Jarvis,
Gary Bernstein (U Penn)
Comments: 18 pages, 1 figure; revised submission with minor edits
Note: replaced with revised version Fri, 23 Dec 2005 21:01:07 GMT (22kb)
Title: Ultra High Energy Cosmic Rays from Sequestered X Bursts
Authors:
Peter L. Biermann,
Paul H. Frampton
Comments: 12 pages LaTeX
Note: replaced with revised version Sun, 25 Dec 2005 20:45:47 GMT (13kb)
Title: Stellar masses: the comparison of theoretical predictions and
measurement data
Authors:
B.V.Vasiliev
Note: replaced with revised version Mon, 26 Dec 2005 08:21:05 GMT (96kb)
Title: A size of ~1 AU for the radio source Sgr A* at the centre of the Milky
Way
Authors:
Zhi-Qiang Shen,
K. Y. Lo,
M.-C. Liang,
Paul T. P. Ho,
J.-H. Zhao
Comments: 18 pages, 4 figures
Journal-ref: Nature, 438(2005)62
Note: replaced with revised version Mon, 26 Dec 2005 00:58:43 GMT (199kb)
Title: Confronting mass-varying neutrinos with MiniBooNE
Authors:
V. Barger,
D. Marfatia,
K. Whisnant
Comments: 22 pages, 3 figures, 1 table. Version to appear in PRD
Note: replaced with revised version Fri, 23 Dec 2005 21:42:59 GMT (34kb)
For subscribe options to combined physics archives,
e-mail To: physics@arXiv.org, Subject: subscribe
-----------------------------------------------------------------------------
For help on viewing and making submissions, see this http URL
For a list of archive mirror sites, see this http URL
-----------------------------------------------------------------------------
Third-party submissions cause excessive problems.
Author self-submissions are exceedingly preferred.
E-mail submissions have been discontinued in favor of better support for
Web submissions. See this http URL
Cross-listings
- gr-qc/0512148 [abs, ps, pdf, other] :
-
Title: Classical Solutions in Einstein's Gravity and Study of some Collapsing
Models
Authors:
Ujjal Debnath
Comments: Ph.D Thesis (2004), 185 Latex pages, 14 figures
My research work can be classified into two parts namely, (i) Cosmological
phenomena with varying speed of light and (ii) Gravitational collapse and black
holes.
We have investigated several cosmological phenomena when velocity of light
varies with time. We have considered the variation of light as power-law in
time and have studied the Brans-Dicke cosmology, Quintessence problem and
others. We have also examined whether some cosmological problems can be solved
using it for anisotropic space-time model.
In brane scenario we have studied some cosmological implications namely, the
Cosmic No-Hair Conjecture (CNHC) and variable gravity theory. In CNHC we have
shown that in realistic situation no more extra conditions are needed in brane
scenario.
In gravitational collapse, we have mainly concentrated to spherical collapse
for dust distribution. We have considered both four and higher dimensional
space-time and have examined the possibility for formation of black hole or
naked singularity. In marginally bound case we have found naked singularity is
possible only for four and five dimension, while for non-marginally bound case
the possibility of black hole increases with the increase in the dimension of
the space-time.
In quasi-spherical gravitational collapse for dust distribution, we have
(n+2) dimensional Szekeres space-time and have examined the possibility for
formation of black hole or naked singularity. In marginally bound case, we have
found that possibility of naked singularity depends on dimension of the
space-time.
- hep-ph/0512320 [abs, ps, pdf, other] :
-
Title: Classification of dark energy models in the (w_0,w_a) plane
Authors:
V. Barger,
E. Guarnaccia,
D Marfatia
Comments: 11 pages, 3 figures
We classify dark energy models in a plane of observables that correspond to
the common parameterization of a non-constant equation of state, w(a)=w_0 +
w_a(1-a), where $a$ is the scale factor of the universe. The models fall into
four classes and only two of these classes have a region of overlap in the
observable plane. We perform a joint analysis of all Type Ia supernova (SNIa)
data compiled by the High-Z SN Search Team (HZT) and the Supernova Legacy
Survey (SNLS) and find that no class of models is excluded by current SNIa
data. However, an analysis of large scale structure, Ly$\alpha$ forest and bias
constraints from SDSS, the Gold SNIa data and WMAP data indicates that
non-phantom barotropic models with a a positive sound speed are excluded at the
95% C.L.
- physics/0512223 [abs, pdf] :
-
Title: Reply to Comment on Symbolic Calculation of Two-Center Overlap Integrals
Over Slater-Type Orbitals
Authors:
Sedat Gumus,
Telhat Ozdogan
Comments: 1 page
Subj-class: Chemical Physics; Mathematical Physics
Journal-ref: Journal of the Chinese Chemical Society, 51 (2004) 879-880
The comments of Guseinov are critically analyzed. Contrary to his comments,
it is pointed out that our formula for two-center overlap integrals over Slater
type orbitals have been derived independently, not derived from the earlier
works of Guseinov by changing the summation indices. Therefore, our algorithm
is original, is not affected from possible instability problems and can be used
in large scale calculations without loss of significant figures. Meanwhile, it
should be stressed that his comment on the transformation of our formula into
his formula proves the correctness of our algorithm and therefore can be
regarded as a nice sound of science.
- physics/0512231 [abs, ps, pdf, other] :
-
Title: Very High Mach Number Electrostatic Shocks in Collisionless Plasmas
Authors:
G. Sorasio,
M. Marti,
R. Fonseca,
L. O. Silva
Comments: 6 pages, submitted to Phys. Rev. Lett
Subj-class: Plasma Physics
The kinetic theory of collisionless electrostatic shocks resulting from the
collision of plasma slabs with different temperatures and densities is
presented. The theoretical results are confirmed by self-consistent
particle-in-cell simulations, revealing the formation and stable propagation of
electrostatic shocks with very high Mach numbers ($M \gg 10$), well above the
predictions of the classical theories for electrostatic shocks.
Replacements
- astro-ph/0412619 [abs, ps, pdf, other] :
-
Title: Exactly Solvable SFT Inspired Phantom Model
Authors:
I.Ya. Aref'eva,
A.S. Koshelev,
S.Yu. Vernov
Comments: LaTeX, 21 pages, 8 figures; to be published in Theor.Math.Phys
Note: replaced with revised version Wed, 28 Dec 2005 18:01:27 GMT (807kb)
- astro-ph/0507540 [abs, ps, pdf, other] :
-
Title: Stochastical distributions of lens and source properties for observed
galactic microlensing events
Authors:
M. Dominik
Comments: 25 pages with 22 embedded EPS-figures, uses mn2e.cls. Adopted mass
function revised and one example event replaced, content rearranged, some
minor changes. Submitted to MNRAS
Note: replaced with revised version Tue, 27 Dec 2005 19:37:24 GMT (476kb)
- astro-ph/0508360 [abs, ps, pdf, other] :
-
Title: The Effects of Multiple Companions on the Efficiency of the SIM Planet
Searches
Authors:
Eric B. Ford (UC Berkeley)
Comments: 45 pages, 16 figures, 1 table, to appear in PASP
Note: replaced with revised version Wed, 28 Dec 2005 20:08:23 GMT (94kb)
- astro-ph/0510773 [abs, ps, pdf, other] :
-
Title: Signatures of restarted activity in core-dominated, triple radio sources
selected from the FIRST survey
Authors:
A. Marecki (1),
P. Thomasson (2),
K.-H. Mack (3),
M. Kunert-Bajraszewska (1) ((1) Torun Centre for Astronomy, N. Copernicus University, Poland, (2) Jodrell Bank Observatory, The University of Manchester, UK, (3) INAF - Istituto di Radioastronomia, Bologna, Italy)
Comments: 9 pages, 5 figures, matches the version printed in Astronomy &
Astrophysics
Note: replaced with revised version Wed, 28 Dec 2005 13:51:37 GMT (200kb)
- astro-ph/0511046 [abs, ps, pdf, other] :
-
Title: New Models for a Triaxial Milky Way Spheroid and Effect on the
Microlensing Optical Depth to the Large Magellanic Cloud
Authors:
Christopher Savage,
Heidi Jo Newberg,
Katherine Freese,
Paolo Gondolo
Comments: 12 pages, 2 figures. Revised version submitted to Astron. Astrophys
Note: replaced with revised version Tue, 27 Dec 2005 19:44:40 GMT (205kb)
- astro-ph/0511674 [abs, ps, pdf, other] :
-
Title: Sky coverage of orbital detectors. Analytical approach
Authors:
Diego Casadei
Comments: 12pages, 7 figures
Note: replaced with revised version Wed, 28 Dec 2005 15:53:03 GMT (156kb)
- astro-ph/0512004 [abs, ps, pdf, other] :
-
Title: What galaxies know about their nearest cluster
Authors:
Alejandro D. Quintero,
Andreas A. Berlind,
Michael R. Blanton,
David W. Hogg
Comments: Submitted to ApJ
Note: replaced with revised version Wed, 28 Dec 2005 00:00:22 GMT (97kb)
- astro-ph/0512058 [abs, ps, pdf, other] :
-
Title: The Cosmological Constant in Brane Cosmology
Authors:
Jia-Zhong Chen,
Duoje Jia
Comments: 6 pages,1 color figure, RevTex 4 form, PRD style, References
corrected
Note: replaced with revised version Tue, 27 Dec 2005 16:35:03 GMT (28kb,P)
- astro-ph/0512424 [abs, pdf] :
-
Title: Galactic evolutionary path from primeval irregulars to present-day
ellipticals
Authors:
Masao Mori (UCLA/Senshu Univ.),
Masayuki Umemura (Univ. of Tsukuba)
Comments: Nature, in press 27 pages, 4 figures, Supplementary Information
included, movie available on this http URL
Note: replaced with revised version Mon, 26 Dec 2005 23:41:33 GMT (909kb)
- gr-qc/0504030 [abs, ps, pdf, other] :
-
Title: The quantum black hole
Authors:
Budh Ram,
Arun Ram,
Nilam Ram
Comments: 13 pages, no figs. v2: minor typos corrected. conclusions unchanged
Note: replaced with revised version Wed, 28 Dec 2005 08:58:26 GMT (14kb)
For subscribe options to combined physics archives,
e-mail To: physics@arXiv.org, Subject: subscribe
-----------------------------------------------------------------------------
For help on viewing and making submissions, see this http URL
For a list of archive mirror sites, see this http URL
-----------------------------------------------------------------------------
Third-party submissions cause excessive problems.
Author self-submissions are exceedingly preferred.
E-mail submissions have been discontinued in favor of better support for
Web submissions. See this http URL
Cross-listings
- gr-qc/0512148 [abs, ps, pdf, other] :
-
Title: Classical Solutions in Einstein's Gravity and Study of some Collapsing
Models
Authors:
Ujjal Debnath
Comments: Ph.D Thesis (2004), 185 Latex pages, 14 figures
My research work can be classified into two parts namely, (i) Cosmological
phenomena with varying speed of light and (ii) Gravitational collapse and black
holes.
We have investigated several cosmological phenomena when velocity of light
varies with time. We have considered the variation of light as power-law in
time and have studied the Brans-Dicke cosmology, Quintessence problem and
others. We have also examined whether some cosmological problems can be solved
using it for anisotropic space-time model.
In brane scenario we have studied some cosmological implications namely, the
Cosmic No-Hair Conjecture (CNHC) and variable gravity theory. In CNHC we have
shown that in realistic situation no more extra conditions are needed in brane
scenario.
In gravitational collapse, we have mainly concentrated to spherical collapse
for dust distribution. We have considered both four and higher dimensional
space-time and have examined the possibility for formation of black hole or
naked singularity. In marginally bound case we have found naked singularity is
possible only for four and five dimension, while for non-marginally bound case
the possibility of black hole increases with the increase in the dimension of
the space-time.
In quasi-spherical gravitational collapse for dust distribution, we have
(n+2) dimensional Szekeres space-time and have examined the possibility for
formation of black hole or naked singularity. In marginally bound case, we have
found that possibility of naked singularity depends on dimension of the
space-time.
- hep-ph/0512320 [abs, ps, pdf, other] :
-
Title: Classification of dark energy models in the (w_0,w_a) plane
Authors:
V. Barger,
E. Guarnaccia,
D Marfatia
Comments: 11 pages, 3 figures
We classify dark energy models in a plane of observables that correspond to
the common parameterization of a non-constant equation of state, w(a)=w_0 +
w_a(1-a), where $a$ is the scale factor of the universe. The models fall into
four classes and only two of these classes have a region of overlap in the
observable plane. We perform a joint analysis of all Type Ia supernova (SNIa)
data compiled by the High-Z SN Search Team (HZT) and the Supernova Legacy
Survey (SNLS) and find that no class of models is excluded by current SNIa
data. However, an analysis of large scale structure, Ly$\alpha$ forest and bias
constraints from SDSS, the Gold SNIa data and WMAP data indicates that
non-phantom barotropic models with a a positive sound speed are excluded at the
95% C.L.
- physics/0512223 [abs, pdf] :
-
Title: Reply to Comment on Symbolic Calculation of Two-Center Overlap Integrals
Over Slater-Type Orbitals
Authors:
Sedat Gumus,
Telhat Ozdogan
Comments: 1 page
Subj-class: Chemical Physics; Mathematical Physics
Journal-ref: Journal of the Chinese Chemical Society, 51 (2004) 879-880
The comments of Guseinov are critically analyzed. Contrary to his comments,
it is pointed out that our formula for two-center overlap integrals over Slater
type orbitals have been derived independently, not derived from the earlier
works of Guseinov by changing the summation indices. Therefore, our algorithm
is original, is not affected from possible instability problems and can be used
in large scale calculations without loss of significant figures. Meanwhile, it
should be stressed that his comment on the transformation of our formula into
his formula proves the correctness of our algorithm and therefore can be
regarded as a nice sound of science.
- physics/0512231 [abs, ps, pdf, other] :
-
Title: Very High Mach Number Electrostatic Shocks in Collisionless Plasmas
Authors:
G. Sorasio,
M. Marti,
R. Fonseca,
L. O. Silva
Comments: 6 pages, submitted to Phys. Rev. Lett
Subj-class: Plasma Physics
The kinetic theory of collisionless electrostatic shocks resulting from the
collision of plasma slabs with different temperatures and densities is
presented. The theoretical results are confirmed by self-consistent
particle-in-cell simulations, revealing the formation and stable propagation of
electrostatic shocks with very high Mach numbers ($M \gg 10$), well above the
predictions of the classical theories for electrostatic shocks.
Replacements
- astro-ph/0412619 [abs, ps, pdf, other] :
-
Title: Exactly Solvable SFT Inspired Phantom Model
Authors:
I.Ya. Aref'eva,
A.S. Koshelev,
S.Yu. Vernov
Comments: LaTeX, 21 pages, 8 figures; to be published in Theor.Math.Phys
Note: replaced with revised version Wed, 28 Dec 2005 18:01:27 GMT (807kb)
- astro-ph/0507540 [abs, ps, pdf, other] :
-
Title: Stochastical distributions of lens and source properties for observed
galactic microlensing events
Authors:
M. Dominik
Comments: 25 pages with 22 embedded EPS-figures, uses mn2e.cls. Adopted mass
function revised and one example event replaced, content rearranged, some
minor changes. Submitted to MNRAS
Note: replaced with revised version Tue, 27 Dec 2005 19:37:24 GMT (476kb)
- astro-ph/0508360 [abs, ps, pdf, other] :
-
Title: The Effects of Multiple Companions on the Efficiency of the SIM Planet
Searches
Authors:
Eric B. Ford (UC Berkeley)
Comments: 45 pages, 16 figures, 1 table, to appear in PASP
Note: replaced with revised version Wed, 28 Dec 2005 20:08:23 GMT (94kb)
- astro-ph/0510773 [abs, ps, pdf, other] :
-
Title: Signatures of restarted activity in core-dominated, triple radio sources
selected from the FIRST survey
Authors:
A. Marecki (1),
P. Thomasson (2),
K.-H. Mack (3),
M. Kunert-Bajraszewska (1) ((1) Torun Centre for Astronomy, N. Copernicus University, Poland, (2) Jodrell Bank Observatory, The University of Manchester, UK, (3) INAF - Istituto di Radioastronomia, Bologna, Italy)
Comments: 9 pages, 5 figures, matches the version printed in Astronomy &
Astrophysics
Note: replaced with revised version Wed, 28 Dec 2005 13:51:37 GMT (200kb)
- astro-ph/0511046 [abs, ps, pdf, other] :
-
Title: New Models for a Triaxial Milky Way Spheroid and Effect on the
Microlensing Optical Depth to the Large Magellanic Cloud
Authors:
Christopher Savage,
Heidi Jo Newberg,
Katherine Freese,
Paolo Gondolo
Comments: 12 pages, 2 figures. Revised version submitted to Astron. Astrophys
Note: replaced with revised version Tue, 27 Dec 2005 19:44:40 GMT (205kb)
- astro-ph/0511674 [abs, ps, pdf, other] :
-
Title: Sky coverage of orbital detectors. Analytical approach
Authors:
Diego Casadei
Comments: 12pages, 7 figures
Note: replaced with revised version Wed, 28 Dec 2005 15:53:03 GMT (156kb)
- astro-ph/0512004 [abs, ps, pdf, other] :
-
Title: What galaxies know about their nearest cluster
Authors:
Alejandro D. Quintero,
Andreas A. Berlind,
Michael R. Blanton,
David W. Hogg
Comments: Submitted to ApJ
Note: replaced with revised version Wed, 28 Dec 2005 00:00:22 GMT (97kb)
- astro-ph/0512058 [abs, ps, pdf, other] :
-
Title: The Cosmological Constant in Brane Cosmology
Authors:
Jia-Zhong Chen,
Duoje Jia
Comments: 6 pages,1 color figure, RevTex 4 form, PRD style, References
corrected
Note: replaced with revised version Tue, 27 Dec 2005 16:35:03 GMT (28kb,P)
- astro-ph/0512424 [abs, pdf] :
-
Title: Galactic evolutionary path from primeval irregulars to present-day
ellipticals
Authors:
Masao Mori (UCLA/Senshu Univ.),
Masayuki Umemura (Univ. of Tsukuba)
Comments: Nature, in press 27 pages, 4 figures, Supplementary Information
included, movie available on this http URL
Note: replaced with revised version Mon, 26 Dec 2005 23:41:33 GMT (909kb)
- gr-qc/0504030 [abs, ps, pdf, other] :
-
Title: The quantum black hole
Authors:
Budh Ram,
Arun Ram,
Nilam Ram
Comments: 13 pages, no figs. v2: minor typos corrected. conclusions unchanged
Note: replaced with revised version Wed, 28 Dec 2005 08:58:26 GMT (14kb)
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