Cross-listings

gr-qc/0612180 [abs, ps, pdf, other] :: Title: Conditions for the cosmological viability of f(R) dark energy models
Authors: Luca Amendola, Radouane Gannouji, David Polarski, Shinji Tsujikawa
Comments: 25 pages, 11 figures

We clarify the conditions under which dark energy models whose Lagrangian densities f are written in terms of the Ricci scalar R are cosmologically viable. The existence of a viable matter dominated epoch prior to a late-time acceleration requires that the variable m=Rf_{,RR}/f_{,R} (where f_{,R}=df/dR) satisfies the conditions m(r) approx +0 and dm/dr>-1 at r approx -1 where r=-Rf_{,R}/f. For the existence of a viable late-time acceleration we require instead either (i) m=-r-1, (sqrt{3}-1)/2 < m le 1 and dm/dr<-1 or (ii) 0< m le 1 at r=-2. These conditions identify two regions in the (r,m) space, one for the matter era and the other for the acceleration. Only models with a m(r) curve that connects these regions and satisfy the requirements above lead to an acceptable cosmology. The models of the type f(R)= alpha R^{-n} and f=R+ alpha R^{-n} do not satisfy these conditions for any n>0 and n<-1 and are thus cosmologically unacceptable. Similar conclusions can be reached for many other examples discussed in the text. In most cases the standard matter era is replaced by a cosmic expansion with scale factor a=t^{1/2}. We show that the cosmological behavior of f(R) models can be understood by a geometrical approach consisting in studying the m(r) curve on the (r,m) plane. This allows us to classify the f(R) models into four general classes, depending on the existence of a standard matter epoch and on the final accelerated stage. Among several other results, we find that f(R) models can have a strongly phantom attractor but in this case there is no acceptable matter era.
physics/0612243 [abs, ps, pdf, other] :: Title: Spin magnetohydrodynamics
Authors: G. Brodin, M. Marklund
Comments: 10 pages
Subj-class: Plasma Physics

Starting from the non-relativistic Pauli description of spin 1/2 particles, a set of fluid equations, governing the dynamics of such particles interacting with external fields and other particles, is derived. The equations describe electrons, positrons, holes, and similar conglomerates. In the case of electrons, the magnetohydrodynamic limit of an electron-ion plasma is investigated as well as the case of plasmas containing dust particles. The results should be of interest and relevance both to laboratory and astrophysical plasmas.

Replacements

astro-ph/0612476 [abs, ps, pdf, other] :: Title: The Galactic Halo's O VI Resonance Line Intensity
Authors: Robin L. Shelton, Shauna M. Sallmen, Edward B. Jenkins
Comments: Accepted by the Astrophysical Journal, AASTEX, 39 pages, including 6 figures and 4 tables (manuscript replaced in order to re-typeset Table 3 and correct submission entry)
Note: replaced with revised version Fri, 29 Dec 2006 19:14:00 GMT (150kb)
astro-ph/0612726 [abs, pdf] :: Title: Evidence Contrary to the Existing Exo-Planet Migration Concept
Authors: J. Marvin Herndon
Note: replaced with revised version Thu, 28 Dec 2006 23:06:01 GMT (52kb)
gr-qc/0612022 [abs, ps, pdf, other] :: Title: Dynamical determination of the quadrupole mass moment of the double pulsar PSR J0737-3039 system
Authors: Lorenzo Iorio
Comments: LaTex2e, 13 pages, 1 figure, 2 tables, 23 references. Evidence of inadequacy of a purely keplerian model of P from the sum of the masses added
Note: replaced with revised version Fri, 29 Dec 2006 10:50:40 GMT (14kb)

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Cross-listings

gr-qc/0612180 [abs, ps, pdf, other] :: Title: Conditions for the cosmological viability of f(R) dark energy models
Authors: Luca Amendola, Radouane Gannouji, David Polarski, Shinji Tsujikawa
Comments: 25 pages, 11 figures

We clarify the conditions under which dark energy models whose Lagrangian densities f are written in terms of the Ricci scalar R are cosmologically viable. The existence of a viable matter dominated epoch prior to a late-time acceleration requires that the variable m=Rf_{,RR}/f_{,R} (where f_{,R}=df/dR) satisfies the conditions m(r) approx +0 and dm/dr>-1 at r approx -1 where r=-Rf_{,R}/f. For the existence of a viable late-time acceleration we require instead either (i) m=-r-1, (sqrt{3}-1)/2 < m le 1 and dm/dr<-1 or (ii) 0< m le 1 at r=-2. These conditions identify two regions in the (r,m) space, one for the matter era and the other for the acceleration. Only models with a m(r) curve that connects these regions and satisfy the requirements above lead to an acceptable cosmology. The models of the type f(R)= alpha R^{-n} and f=R+ alpha R^{-n} do not satisfy these conditions for any n>0 and n<-1 and are thus cosmologically unacceptable. Similar conclusions can be reached for many other examples discussed in the text. In most cases the standard matter era is replaced by a cosmic expansion with scale factor a=t^{1/2}. We show that the cosmological behavior of f(R) models can be understood by a geometrical approach consisting in studying the m(r) curve on the (r,m) plane. This allows us to classify the f(R) models into four general classes, depending on the existence of a standard matter epoch and on the final accelerated stage. Among several other results, we find that f(R) models can have a strongly phantom attractor but in this case there is no acceptable matter era.
physics/0612243 [abs, ps, pdf, other] :: Title: Spin magnetohydrodynamics
Authors: G. Brodin, M. Marklund
Comments: 10 pages
Subj-class: Plasma Physics

Starting from the non-relativistic Pauli description of spin 1/2 particles, a set of fluid equations, governing the dynamics of such particles interacting with external fields and other particles, is derived. The equations describe electrons, positrons, holes, and similar conglomerates. In the case of electrons, the magnetohydrodynamic limit of an electron-ion plasma is investigated as well as the case of plasmas containing dust particles. The results should be of interest and relevance both to laboratory and astrophysical plasmas.

Replacements

astro-ph/0612476 [abs, ps, pdf, other] :: Title: The Galactic Halo's O VI Resonance Line Intensity
Authors: Robin L. Shelton, Shauna M. Sallmen, Edward B. Jenkins
Comments: Accepted by the Astrophysical Journal, AASTEX, 39 pages, including 6 figures and 4 tables (manuscript replaced in order to re-typeset Table 3 and correct submission entry)
Note: replaced with revised version Fri, 29 Dec 2006 19:14:00 GMT (150kb)
astro-ph/0612726 [abs, pdf] :: Title: Evidence Contrary to the Existing Exo-Planet Migration Concept
Authors: J. Marvin Herndon
Note: replaced with revised version Thu, 28 Dec 2006 23:06:01 GMT (52kb)
gr-qc/0612022 [abs, ps, pdf, other] :: Title: Dynamical determination of the quadrupole mass moment of the double pulsar PSR J0737-3039 system
Authors: Lorenzo Iorio
Comments: LaTex2e, 13 pages, 1 figure, 2 tables, 23 references. Evidence of inadequacy of a purely keplerian model of P from the sum of the masses added
Note: replaced with revised version Fri, 29 Dec 2006 10:50:40 GMT (14kb)

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Cross-listings

gr-qc/0612132 [abs, ps, pdf, other] :: Title: Broken Scale Invariance and Quintessence (a quarter of a century ago)
Authors: G. Venturi
Comments: 3 pages, contribution to the proceedings of MG11, Berlin, 23-29 July, 2006

The cosmological consequences of a simple scalar field model for the generation of Newton's constant through the spontaneous breaking of scale invariance in a curved space-time are again presented and discussed. Such a model leads to a consistent description wherein the introduction of matter introduces a small perturbation on a de Sitter universe and a time dependence of the gravitational coupling.
gr-qc/0612164 [abs, ps, pdf, other] :: Title: Predictions in eternal inflation
Authors: Sergei Winitzki
Comments: Invited review for a LNP volume on inflationary cosmology. Figures included. Minor changes, references added, references reordered and reformatted

In generic models of cosmological inflation, quantum fluctuations strongly influence the spacetime metric and produce infinitely many regions where the end of inflation (reheating) is delayed until arbitrarily late times. The geometry of the resulting spacetime is highly inhomogeneous on scales of many Hubble sizes. The recently developed string-theoretic picture of the "landscape" presents a similar structure, where an infinite number of de Sitter, flat, and anti-de Sitter universes are nucleated via quantum tunneling. Since observers on the Earth have no information about their location within the eternally inflating universe, the main question in this context is to obtain statistical predictions for quantities observed at a random location. I describe the problems arising within this statistical framework, such as the need for a volume cutoff and the dependence of cutoff schemes on time slicing and on the initial conditions. After reviewing different approaches and mathematical techniques developed in the past two decades for studying these issues, I discuss the existing proposals for extracting predictions and give examples of their applications.
hep-ph/0612334 [abs, ps, pdf, other] :: Title: Space-Time Duality and Vacuum Energy
Authors: Hirotaka Sugawara
Comments: 23 pages total with 2 figures

The concept of Euclidean time is proposed which is dual to the usual Minkowski time. The De Sitter solution is shown to be dual to the anti-De Sitter solution under the dual transformation in which Euclidean time and Minkowski time are interchanged. This observation enables us to make a proposal in which supersymmetry is broken, but the four dimensional cosmological constant remains zero. An explicit model is proposed in which we calculate the cosmological constant. The phenomenology based on this model is presented, including the issue of the quark-lepton-Higgs mass matrix.
hep-th/0612141 [abs, ps, pdf, other] :: Title: Area metric gravity and accelerating cosmology
Authors: Raffaele Punzi, Frederic P. Schuller, Mattias N.R. Wohlfarth
Comments: 52 pages, 1 figure, companion paper to hep-th/0612133

Area metric manifolds emerge as effective classical backgrounds in quantum string theory and quantum gauge theory, and present a true generalization of metric geometry. Here, we consider area metric manifolds in their own right, and develop in detail the foundations of area metric differential geometry. Based on the construction of an area metric curvature scalar, which reduces in the metric-induced case to the Ricci scalar, we re-interpret the Einstein-Hilbert action as dynamics for an area metric spacetime. In contrast to modifications of general relativity based on metric geometry, no continuous deformation scale needs to be introduced; the extension to area geometry is purely structural and thus rigid. We present an intriguing prediction of area metric gravity: without dark energy or fine-tuning, the late universe exhibits a small acceleration.
physics/0612253 [abs, pdf] :: Title: Goedel and Physics
Authors: John D. Barrow
Comments: 20 pages, 2 figures. Paper delivered at 'Horizons of Truth', Kurt Goedel Centenary Meeting, Vienna, 27-29th April 2006
Subj-class: History of Physics; Popular Physics

We introduce some early considerations of physical and mathematical impossibility as preludes to the Goedel incompleteness theorems. We consider some informal aspects of these theorems and their underlying assumptions and discuss some the responses to these theorems by those seeking to draw conclusions from them about the completability of theories of physics. We argue that there is no reason to expect Goedel incompleteness to handicap the search for a description of the laws of Nature, but we do expect it to limit what we can predict about the outcomes of those laws, and examples are given. We discuss the Goedel universe and the role it played in revealing the possibilities that a global understanding of space-time would reveal. Finally, we show how recent studies of supertasks have shown how global space-time structure determines the ultimate capability of computational devices within them.

Replacements

astro-ph/0602232 [abs, pdf] :: Title: Solar System Processes Underlying Planetary Formation, Geodynamics, and the Georeactor
Authors: J. Marvin Herndon
Comments: Invited paper for the Special Issue of Earth, Moon and Planets entitled Neutrino Geophysics Added final corrections for publication
Note: replaced with revised version Tue, 2 Jan 2007 15:31:18 GMT (518kb)
astro-ph/0606009 [abs, ps, pdf, other] :: Title: The Eccentricity-Mass Distribution of Exoplanets: Signatures of Different Formation Mechanisms?
Authors: Ignasi Ribas (CSIC-IEEC, Spain), Jordi Miralda-Escude (CSIC-IEEC, ICREA, Spain)
Comments: 7 pages, 4 figures. Version with expanded discussion section. Accepted for publication in A&A
Note: replaced with revised version Tue, 2 Jan 2007 13:07:10 GMT (43kb)
astro-ph/0606028 [abs, ps, pdf, other] :: Title: Dark matter clustering: a simple renormalization group approach
Authors: Patrick McDonald (CITA)
Comments: much expanded explanation of basic calculation
Note: replaced with revised version Sat, 30 Dec 2006 19:50:14 GMT (36kb)
astro-ph/0606265 [abs, ps, pdf, other] :: Title: The mean electro-motive force, current- and cross-helicity under the influence of rotation, magnetic field and shear
Authors: V.V.Pipin
Comments: 26 pages, 8 figures, submitted to GAFD
Note: replaced with revised version Sat, 30 Dec 2006 10:26:30 GMT (109kb)
astro-ph/0606359 [abs, ps, pdf, other] :: Title: Astrometric Perturbations in Substructure Lensing
Authors: Jacqueline Chen (1), Eduardo Rozo (2), Neal Dalal (3), James E. Taylor (4) ((1) AIfA, (2) CCAPP, OSU, (3) CITA, (4) UWaterloo)
Comments: 15 pages, 13 figures, ApJ accepted version. 2 new figures, additional section on halo-to-halo variation
Note: replaced with revised version Mon, 1 Jan 2007 13:33:41 GMT (81kb)
astro-ph/0608127 [abs, ps, pdf, other] :: Title: The nature of damped Lyman alpha and sub-damped Lyman alpha absorbers
Authors: Pushpa Khare, Varsha P. Kulkarni, Celine Peroux, Donald G. York, James T. Lauroesch, Joseph. D. Meiring
Comments: Expanded version. accepted for publication in A&A, 7 pages, 2 figures
Note: replaced with revised version Tue, 2 Jan 2007 15:49:59 GMT (26kb)
astro-ph/0609356 [abs, ps, pdf, other] :: Title: Discovery of 9 New Companions to Nearby Young M Stars with the Altair AO System
Authors: Sebastian Daemgen, Nick Siegler, I. Neill Reid, Laird M. Close
Comments: To appear in the January 1, 2007 issue of the Astrophysical Journal, 12 pages, 13 figures. Minor typographical and grammatical changes. Wrong round off in binary fraction corrected
Journal-ref: The Astrophysical Journal 654 (2007), 558-569
Note: replaced with revised version Sat, 30 Dec 2006 14:24:29 GMT (777kb)
astro-ph/0611608 [abs, ps, pdf, other] :: Title: AXPs/SGRs: Magnetars or Quark-stars?
Authors: Renxin Xu (PKU)
Comments: 10 pages, COSPAR2006 E1.3, submitted
Note: replaced with revised version Mon, 1 Jan 2007 11:36:07 GMT (11kb)
astro-ph/0612546 [abs, ps, pdf, other] :: Title: Bulges and disks in the Host Galaxies of low redshift 3CR Sources: a near-IR view of their radial brightness profile
Authors: Carlos J. Donzelli, Marco Chiaberge, F. Duccio Macchetto, Juan P. Madrid, Alessandro Capetti, Danilo Marchesini
Comments: 19 pages, 4 tables, 25 figures. Sumitted to ApJ. Corrected typos
Note: replaced with revised version Fri, 29 Dec 2006 23:30:52 GMT (262kb)
astro-ph/0612697 [abs, ps, pdf, other] :: Title: A gaseous metal disk around a white dwarf
Authors: B.T. Gaensicke, T.R. Marsh, J. Southworth, A. Rebassa-Mansergas
Comments: Published 22 December in Science, added journal ref
Journal-ref: Vol. 314. no. 5807, pp. 1908 - 1910
Note: replaced with revised version Sun, 31 Dec 2006 17:04:25 GMT (139kb)
astro-ph/0612772 [abs, ps, pdf, other] :: Title: NUclei of GAlaxies: V. Radio emission in 7 NUGA sources
Authors: M. Krips, A. Eckart, T.P. Krichbaum, J.-U. Pott, S. Leon, R. Neri, S. Garcia-Burillo, F. Combes, F. Boone, A.J. Baker, L.J. Tacconi, E. Schinnerer, L.K. Hunt
Comments: Accepted for publication by A&A; 13 pages and 6 figures; Fig.5 & 6 have been revised
Note: replaced with revised version Tue, 2 Jan 2007 20:28:08 GMT (224kb)
gr-qc/0612076 [abs, ps, pdf, other] :: Title: Spin Flips and Precession in Black-Hole-Binary Mergers
Authors: Manuela Campanelli, Carlos O. Lousto, Yosef Zlochower, Badri Krishnan, David Merritt
Comments: Revtex4, 17 figures, 14 pages. Minor fixes
Note: replaced with revised version Mon, 1 Jan 2007 14:58:07 GMT (223kb)
hep-th/0609095 [abs, ps, pdf, other] :: Title: The Measure Problem in Cosmology
Authors: G.W. Gibbons, Neil Turok
Comments: 22 pages, 6 figures. Revised version with clarifying remarks on meaning of adopted measure, extra references and minor typographical corrections
Note: replaced with revised version Tue, 2 Jan 2007 18:53:04 GMT (65kb)

For subscribe options to combined physics archives,
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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/0501105 [abs, ps, pdf, other] :: Title: Self Sustained Traversable Wormholes?
Authors: Remo Garattini
Comments: RevTeX 4, 12 pages. Accepted for publication on Classical and Quantum Gravity
Journal-ref: Class.Quant.Grav. 22 (2005) 1105-1118

We compute the graviton one loop contribution to a classical energy in a traversable wormhole background. Such a contribution is evaluated by means of a variational approach with Gaussian trial wave functionals. A zeta function regularization is involved to handle with divergences. A renormalization procedure is introduced and the finite one loop energy is considered as a self-consistent source for the traversable wormhole.
gr-qc/0701019 [abs, ps, pdf, other] :: Title: Self sustained traversable wormholes and the equation of state
Authors: Remo Garattini
Comments: Uses RevTeX 4. 21 pages. Submitted to Classical and Quantum Gravity. Extended version of the talk given at ERE2006 (Palma de Mallorca, September 4-8, 2006) and of the talk given at MG11-GT5, Berlin, 23-29 July, 2006

We compute the graviton one loop contribution to a classical energy in a \textit{traversable} wormhole background. The form of the shape function considered is obtained by the equation of state $p=\omega\rho$. We investigate the size of the wormhole as a function of the parameter $\omega$. The investigation is evaluated by means of a variational approach with Gaussian trial wave functionals. A zeta function regularization is involved to handle with divergences. A renormalization procedure is introduced and the finite one loop energy is considered as a \textit{self-consistent} source for the traversable wormhole.The case of the phantom region is briefly discussed.
gr-qc/0701020 [abs, ps, pdf, other] :: Title: Self sustained phantom wormholes in semi-classical gravity
Authors: Remo Garattini, Francisco S. N. Lobo
Comments: Uses RevTeX 4. 10 pages

A possible candidate for the late time accelerated expanding Universe is phantom energy, which possesses rather bizarre properties, such as the prediction of a Big Rip singularity and the violation of the null energy condition. The latter is a fundamental ingredient of traversable wormholes, and it has been shown that phantom energy may indeed sustain these exotic geometries. Inspired by the evolving dark energy parameter crossing the phantom divide, we consider in this work a varying equation of state parameter dependent on the radial coordinate, i.e., $\omega(r)=p(r)/\rho(r)$. We shall impose that phantom energy is concentrated in the neighborhood of the throat, to ensure the flaring out condition, and several models are analyzed. We shall also consider the possibility that these phantom wormholes be sustained by their own quantum fluctuations. The energy density of the graviton one loop contribution to a classical energy in a phantom wormhole background and the finite one loop energy density are considered as a self-consistent source for these wormhole geometries. The latter semi-classical approach prohibits solutions with a constant equation of state parameter, which further motivates the imposition of a radial dependent parameter, $\omega(r)$, and only permits solutions with a steep positive slope proportional to the radial derivative of the equation of state parameter, evaluated at the throat. The size of the wormhole throat as a function of the relevant parameters is also explored.
gr-qc/0701021 [abs, ps, pdf, other] :: Title: Cosmology in the Solar System: Pioneer effect is not cosmological
Authors: Marc Lachieze-Rey (APC)

Does the Solar System and, more generally, a gravitationally bound system follow the cosmic expansion law ? Is there a cosmological influence on the dynamics or optics in such systems ? The general relativity theory provides an unique and unambiguous answer, as a solution of Einstein equations with local sources (e.g., the Sun), and with the correct (cosmological) limiting conditions. This solution has no analytic expression. A Taylor development of its metric allows a complete treatment of dynamics and optics in gravitationally bound systems, up to the size of galaxy clusters, taking into account both local and cosmological effects. In the solar System, this provides an estimation of the (non zero) cosmological influence on the Pioneer probe: it fails to account for the " Pioneer effect " by about 10 orders of magnitude. We criticize contradictory claims on this topic.
hep-ph/0612313 [abs, ps, pdf, other] :: Title: Baryogenesis in Brans-Dicke theory
Authors: Sietse van der Post, Tomislav Prokopec (Utrecht University)
Comments: 12 pages, 2 figures

A new mechanism for baryogenesis is proposed in the context of an extended Brans-Dicke (BD) theory. We generalize the BD scalar to complex field with CP violating coupling to curvature and show that the charged BD current can be enhanced during inflationary epoch. After inflation the current decays (via tree level interactions) into the standard model particles. When the BD scalar is charged under baryon and/or lepton number, the decay produces a net baryon number. Rather generically a sufficiently large scalar current can be produced during inflation to account for the observed baryon asymmetry of the Universe. Our baryogensis scenario can in an elegant way be incorporated into a model of extended inflation.

Replacements

astro-ph/0606744 [abs, ps, pdf, other] :: Title: Neutrino Spectra from Low and High Luminosity Populations of Gamma Ray Bursts
Authors: Nayantara Gupta (UNLV), Bing Zhang (UNLV)
Comments: 11 pages, 1 figure expanded version accepted for publication in Astroparticle Physics, conclusion unchanged
Note: replaced with revised version Tue, 2 Jan 2007 23:24:16 GMT (22kb)
astro-ph/0607655 [abs, ps, pdf, other] :: Title: X-Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars: I. Zooming in on Quasar Emission Regions
Authors: David Pooley (UC Berkeley), Jeffrey A. Blackburne, Saul Rappaport, Paul L. Schechter (MIT)
Comments: 11 pages, accepted to ApJ, expanded discussion of the analysis of the flux ratios and how they constrain the quasar emission regions
Note: replaced with revised version Wed, 3 Jan 2007 18:33:47 GMT (166kb)
astro-ph/0608634 [abs, ps, pdf, other] :: Title: Baryonic Pinching of Galactic Dark Matter Halos
Authors: Michael Gustafsson, Malcolm Fairbairn, Jesper Sommer-Larsen
Comments: 16 pages, 14 figures and 8 tables. Minor text improvements, typo corrections and an updated reference list to match the published version
Journal-ref: Phys. Rev. D 74, 123522 (2006)
Note: replaced with revised version Wed, 3 Jan 2007 18:06:40 GMT (298kb)
astro-ph/0609300 [abs, ps, pdf, other] :: Title: Selection bias in the M_BH-sigma and M_BH-L correlations and its consequences
Authors: M. Bernardi, R. K. Sheth, E. Tundo, J. B. Hyde
Comments: 12 pages, 7 figures. Accepted by ApJ. We have added a figure showing that a similar bias is also seen in the K-band. A new appendix describes the BH samples as well as the fits used in the main text
Note: replaced with revised version Wed, 3 Jan 2007 13:07:21 GMT (123kb)
astro-ph/0609301 [abs, ps, pdf, other] :: Title: The sigma - L correlation in Nearby Early-Type Galaxies
Authors: M. Bernardi
Comments: 9 pages, 9 figures. Accepted by AJ. A new appendix describes systematics effects we found in the SDSS velocity dispersion measurements (sigmas < 150 km/s are biased towards larger values; this bias was not present in the Bernardi et al. 2003 sample) and luminosity measurements
Note: replaced with revised version Wed, 3 Jan 2007 13:16:04 GMT (198kb)
astro-ph/0610567 [abs, ps, pdf, other] :: Title: Protoclusters associated with z > 2 radio galaxies. I. Characteristics of high redshift protoclusters
Authors: B. P. Venemans (1,2), H. J. A. Rottgering (1), G. K. Miley (1), W. J. M. van Breugel (3,8), C. De Breuck (4), J. D. Kurk (5), L. Pentericci (6), S. A. Stanford (3,9), R. A. Overzier (1), S. Croft (3,8), H. Ford (7) ((1) Leiden Observatory, (2) Institute of Astronomy, Cambridge, (3) Lawrence Livermore National Laboratory, (4) ESO Garching, (5) MPIA, Heidelberg, (6) Osservatorio Astronomico di Roma, (7) Johns Hopkins University, Baltimore, (8) UC Merced, (9) UC Davis)
Comments: 30 pages, 20 figures. Published in A&A. The article with high resolution figures is available at this http URL
Journal-ref: Astronomy & Astrophysics 461, 823-845 (2007)
Note: replaced with revised version Wed, 3 Jan 2007 12:50:35 GMT (2072kb)
astro-ph/0611299 [abs, ps, pdf, other] :: Title: Nonsaturated Holographic Dark Energy
Authors: B. Guberina, R. Horvat, H. Nikolic
Comments: 9 pages, minor revision, to appear in JCAP
Note: replaced with revised version Wed, 3 Jan 2007 10:39:38 GMT (8kb)
astro-ph/0611608 [abs, ps, pdf, other] :: Title: AXPs/SGRs: Magnetars or Quark-stars?
Authors: Renxin Xu (PKU)
Comments: 10 pages, COSPAR2006 E1.3, submitted
Note: replaced with revised version Wed, 3 Jan 2007 13:50:32 GMT (11kb)
astro-ph/0612730 [abs, ps, pdf, other] :: Title: Epicyclic Frequencies and Resonant Phenomena Near Black Holes: The Current Status
Authors: Alikram N. Aliev
Comments: To appear in the Proceedings of the Eleventh Marcel Grossmann Meeting, Berlin, Germany, 23-29 Jule 2006, 3pp., World Scientific, Singapore (2007)
Note: replaced with revised version Wed, 3 Jan 2007 14:31:17 GMT (25kb)
gr-qc/0510020 [abs, ps, pdf, other] :: Title: General Relativistic Decompression of Binary Neutron Stars During Dynamic Inspiral
Authors: Mark Miller
Comments: Figure replaced, final published version. Dedicated to Rafael Sorkin on his 60th birthday
Journal-ref: Phys. Rev. D, 75, 024001 (2007)
Note: replaced with revised version Wed, 3 Jan 2007 18:49:19 GMT (123kb)
gr-qc/0612164 [abs, ps, pdf, other] :: Title: Predictions in eternal inflation
Authors: Sergei Winitzki
Comments: Invited review for a LNP volume on inflationary cosmology. Figures included. Cosmetic changes, references reformatted according to "apsrev" Bibtex style to avoid citation ordering problems. Revtex style used
Note: replaced with revised version Tue, 2 Jan 2007 22:58:12 GMT (792kb)
hep-ph/0612047 [abs, ps, pdf, other] :: Title: Neutrino Mixing and Neutrino Telescopes
Authors: Werner Rodejohann
Comments: 29 pages, 8 figures. Minor changes, to appear in JCAP
Note: replaced with revised version Wed, 3 Jan 2007 10:17:17 GMT (228kb)
hep-th/0606162 [abs, ps, pdf, other] :: Title: (Quasi)-exactly solvable quasinormal modes
Authors: Hing-Tong Cho, Choon-Lin Ho (Tamkang Univ.)
Comments: 5 pages, 1 figure. Replaced with version to appear in J. Phys. A
Subj-class: High Energy Physics - Theory; Mathematical Physics
Note: replaced with revised version Wed, 3 Jan 2007 09:21:03 GMT (14kb)
hep-th/0610136 [abs, ps, pdf, other] :: Title: General Relativity from a gauged WZW term
Authors: Andres Anabalon, Steven Willison, Jorge Zanelli
Comments: 9 pages, 1 figure. v2: Minor changes in section 1 and 2. Section 3, rewritten
Note: replaced with revised version Wed, 3 Jan 2007 16:43:40 GMT (15kb)

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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/0701016 [abs, ps, pdf, other] :: Title: Comparisons of binary black hole merger waveforms
Authors: John G. Baker, Manuela Campanelli, Frans Pretorius, Yosef Zlochower
Comments: Revtex 4, 5 pages

This a particularly exciting time for gravitational wave physics. Ground-based gravitational wave detectors are now operating at a sensitivity such that gravitational radiation may soon be directly detected, and recently several groups have independently made significant breakthroughs that have finally enabled numerical relativists to solve the Einstein field equations for coalescing black-hole binaries, a key source of gravitational radiation. The numerical relativity community is now in the position to begin providing simulated merger waveforms for use by the data analysis community, and it is therefore very important that we provide ways to validate the results produced by various numerical approaches. Here, we present a simple comparison of the waveforms produced by two very different, but equally successful approaches--the generalized harmonic gauge and the moving puncture methods. We compare waveforms of equal-mass black hole mergers with minimal or vanishing spins. The results show exceptional agreement for the final burst of radiation, with some differences attributable to small spins on the black holes in one case.
hep-th/0612264 [abs, ps, pdf, other] :: Title: Non-singular solutions in multidimensional cosmology with a perfect fluid: acceleration and variation of G
Authors: V. D. Ivashchuk, S. A. Kononogov, V. N. Melnikov, M. Novello
Comments: 6 pages, Latex, G&C style
Journal-ref: Gravitation & Cosmology, Vol. 12, No. 4 (48), 273-278 (2006)

Exact solutions with an exponential behaviour of the scale factors are considered in a multidimensional cosmological model describing the dynamics of n+1 Ricci-flat factor spaces M_i in the presence of a one-component perfect fluid. The pressures in all spaces are proportional to the density: p_i = w_i \rho, i = 0,...,n. Solutions with accelerated expansion of our 3-space M_0 and a small enough variation of the gravitational constant G are found. These solutions exist for two branches of the parameter w_0. The first branch describes superstiff matter with w_0 > 1, the second one may contain phantom matter with w_0 < - 1.
hep-th/0701016 [abs, ps, pdf, other] :: Title: A String-Inspired Quintom Model Of Dark Energy
Authors: Yi-fu Cai, Mingzhe Li, Jian-Xin Lu, Yun-Song Piao, Taotao Qiu, Xinmin Zhang
Comments: 6 pages, 4 figures

We propose in this paper a quintom model of dark energy with a single scalar field $\phi$ given by the lagrangian ${\cal L}=-V(\phi)\sqrt{1-\alpha^\prime\nabla_{\mu}\phi\nabla^{\mu}\phi +\beta^\prime \phi\Box\phi}$. In the limit of $\beta^\prime\to$0 our model reduces to the effective low energy lagrangian of tachyon considered in the literature. We study the cosmological evolution of this model, and show explicitly the behaviors of the equation of state crossing the cosmological constant boundary.
physics/0701026 [abs, ps, pdf, other] :: Title: Reversals in nature and the nature of reversals
Authors: Frank Stefani, Mingtian Xu, Luca Sorriso-Valvo, Gunter Gerbeth, Uwe Günther
Comments: 24 pages, 12 figures
Subj-class: Geophysics; Fluid Dynamics

The asymmetric shape of reversals of the Earth's magnetic field indicates a possible connection with relaxation oscillations as they were early discussed by van der Pol. A simple mean-field dynamo model with a spherically symmetric $\alpha$ coefficient is analysed with view on this similarity, and a comparison of the time series and the phase space trajectories with those of paleomagnetic measurements is carried out. For highly supercritical dynamos a very good agreement with the data is achieved. Deviations of numerical reversal sequences from Poisson statistics are analysed and compared with paleomagnetic data. The role of the inner core is discussed in a spectral theoretical context and arguments and numerical evidence is compiled that the growth of the inner core might be important for the long term changes of the reversal rate and the occurrence of superchrons.

Replacements

astro-ph/0604005 [abs, ps, pdf, other] :: Title: Fomin's conception of quantum cosmogenesis
Authors: Marek Szydlowski, Jacek Golbiak
Comments: 21 pages, 4 figures; (v2) 22 pages, references added, figures improved; (v3) rewritten using revtex4
Note: replaced with revised version Thu, 4 Jan 2007 14:37:03 GMT (178kb)
astro-ph/0608682 [abs, ps, pdf, other] :: Title: Proto-Neutron Star Winds with Magnetic Fields and Rotation
Authors: Brian D. Metzger, Todd A. Thompson, Eliot Quataert
Comments: 21 pages, 12 figures, final version accepted to ApJ
Note: replaced with revised version Thu, 4 Jan 2007 02:15:26 GMT (95kb)
astro-ph/0609824 [abs, ps, pdf, other] :: Title: Simulated X-ray galaxy clusters at the virial radius: slopes of the gas density, temperature and surface brightness profiles
Authors: M. Roncarelli, S. Ettori, K. Dolag, L. Moscardini, S. Borgani, G. Murante
Comments: 13 pages, 6 figures; added reference and other minor changes
Journal-ref: Mon.Not.Roy.Astron.Soc. 373 (2006) 1339-1350
Note: replaced with revised version Thu, 4 Jan 2007 15:45:14 GMT (753kb)
astro-ph/0611018 [abs, ps, pdf, other] :: Title: Radial profile and log-normal fluctuations of intra-cluster medium as an origin of systematic bias of spectroscopic temperature
Authors: Hajime Kawahara, Yasushi Suto, Tetsu Kitayama, Shin Sasaki, Mamoru Shimizu, Elena Rasia, Klaus Dolag
Comments: 17 pages,10 figures, accepted to ApJ, Minor changes
Note: replaced with revised version Thu, 4 Jan 2007 10:01:05 GMT (563kb)
astro-ph/0612151 [abs, ps, pdf, other] :: Title: A Phantom does not Result from a Backreaction
Authors: Hisako Tanaka, Toshifumi Futamase (Tohoku U., Japan)
Comments: 6pages, accepted by Progress of Theoretical Physics
Note: replaced with revised version Thu, 4 Jan 2007 14:32:17 GMT (6kb)
astro-ph/0701018 [abs, ps, pdf, other] :: Title: A Normal Stellar Disk in the Galaxy Malin 1
Authors: A.J. Barth (UC Irvine)
Comments: 13 pages, 7 figures. To appear in AJ. Typographical error corrected
Note: replaced with revised version Wed, 3 Jan 2007 21:53:35 GMT (392kb)
astro-ph/0701033 [abs, ps, pdf, other] :: Title: Gamma-ray emission associated with Cluster-scale AGN Outbursts
Authors: J. A. Hinton, W. Domainko
Comments: 5 pages, 3 figures, submitted to MNRAS
Note: replaced with revised version Thu, 4 Jan 2007 16:38:08 GMT (18kb)
gr-qc/0606114 [abs, ps, pdf, other] :: Title: On the Equation of Motion for a Fast Moving Small Object in the Strong Field Point Particle Limit
Authors: Takashi Fukumoto (1), Toshifumi Futamase (1), Yousuke Itoh (2) ((1) Tohoku U., Japan, (2) U. of Wisconsin Milwaukee, USA)
Comments: accepted by Progress of Theoretical Physics
Journal-ref: Prog.Theor.Phys. 116 (2006) 423-428
Note: replaced with revised version Thu, 4 Jan 2007 08:02:23 GMT (7kb)
hep-ph/0610421 [abs, ps, pdf, other] :: Title: Photon mass and electrogenesis
Authors: Alexander Dolgov, Diego N. Pelliccia
Comments: 15 pages, no figures, text added, typos corrected, refs. improved
Note: replaced with revised version Thu, 4 Jan 2007 18:13:25 GMT (12kb)
hep-ph/0612228 [abs, ps, pdf, other] :: Title: Are small neutrino masses unveiling the missing mass problem of the Universe?
Authors: C. Boehm, Y. Farzan, T. Hambye, S. Palomares-Ruiz, S. Pascoli
Comments: 4pages, 2 figures. Two paragraphs have been added. One for the complex case; the other one for the UV completion
Note: replaced with revised version Wed, 3 Jan 2007 21:41:08 GMT (49kb)

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