Cross-listings

gr-qc/0610079 [abs, ps, pdf, other] :: Title: Dark Gravity
Authors: Frederic Henry-Couannier

Adopting a non geometrical point of view, we are led to an alternative theory of the order two and symetric gravitational tensor field of GR. The field is no more interpreted as the metric of our space-time. The true metric is globally Minkowskian and describes a flat manifold, a context which justifies a genuine rehabilitation of the global discrete space-time symetries involved in the structure of the Lorentz group along with their 'problematic' representations: the negative energy and tachyonic ones.
gr-qc/0702066 [abs, ps, pdf, other] :: Title: Bergmann-Thomson energy-momentum complex for solutions more general than the Kerr-Schild class
Authors: S. S. Xulu (University of Zululand)
Comments: RevTex, 12 pages

In a very well-known paper, Virbhadra's research group proved that the Weinberg, Papapetrou, Landau and Lifshitz, and Einstein energy-momentum complexes ``coincide'' for all metrics of Kerr-Schild class. A few years later, Virbhadra clarified that this ``coincidence'' in fact holds for metrics more general than the Kerr-Schild class. In the present paper, this study is extended for the Bergmann-Thomson complex and it is proved that this complex also ``coincides'' with those complexes for a more general than the Kerr-Schild class metric.
gr-qc/0702138 [abs, ps, pdf, other] :: Title: Dynamics of colliding branes and black brane production
Authors: Yu-ichi Takamizu, Hideaki Kudoh, Kei-ichi Maeda
Comments: 5 pages, 5 figures

We study the dynamics of colliding domain walls including self-gravity. The initial data is set up by applying a BPS domain wall in five-dimensional supergravity, and we evolve the system determining the final outcome of collisions. After a collision, a spacelike curvature singularity covered by a horizon is formed in the bulk, resulting in a black brane with trapped domain walls. This is a generic consequence of collisions, except for non-relativistic weak field cases, in which the walls pass through one another or multiple bounces take place without singularity formation. These results show that incorporating the self-gravity drastically changes a naive picture of colliding branes.
gr-qc/0703001 [abs, ps, pdf, other] :: Title: Elastic stars in general relativity: IV. Axial perturbations
Authors: Max Karlovini, Lars Samuelsson
Comments: 18 pages, no figures

This is the fourth paper in a series that attempt to put forward a consistent framework for modelling solid regions in neutron stars. Here we turn our attention to axial perturbations of spherically symmetric spacetimes using a gauge invariant approach due to one of us. Using the formalism developed in the first paper in the series it turns out that the matter perturbations are neatly expressible in terms of a ``metric'' tensor field depending only on the speeds of shear wave propagation along the principal directions in the solid. The results are applicable to a wide class of elastic materials and does not assume material isotropy nor quasi-Hookean behaviour. The perturbation equations are then specialised to a static background and are given by two coupled wave equations. Our formalism is thus slightly simpler than the previously existing results of Shumaker & Thorne, where an additional initial value equation needs to be solved. The simplification is mainly due to the gauge invariance of our approach and shows up also in somewhat simpler boundary conditions. We also give a first order formulation suitable for numerical integration of the quasi-normal mode problem of a neutron star. The relations between the gauge independent variables and the, in general, gauge dependent perturbed metric and strain tensor are explicitly given.
gr-qc/0703006 [abs, ps, pdf, other] :: Title: Can f(R) Modified Gravity Theories Mimic a LCDM Cosmology?
Authors: S. Fay (Queen Mary U. of London), S. Nesseris (Ioannina U.), L. Perivolaropoulos (Ioannina U.)
Comments: 11 revtex pages, 6 figures. The mathematica files with the numerical analysis of the paper can be found at this http URL
Subj-class: General Relativity and Quantum Cosmology; Mathematical Physics

We consider f(R) modified gravity theories in the metric variation formalism and attempt to reconstruct the function f(R) by demanding a background LCDM cosmology. In particular we impose the following requirements: a. A background cosmic history H(z) provided by the usual flat LCDM parametrization though the radiation (w_eff=1/3), matter (w_eff=0) and deSitter (w_eff=-1) eras. b. Matter and radiation dominate during the `matter' and `radiation' eras respectively i.e. \Omega_m =1 when w_eff=0 and \Omega_r=1 when w_eff=1/3. We have found that the cosmological dynamical system constrained to obey the LCDM cosmic history has four critical points in each era which correspondingly lead to four forms of f(R). One of them is the usual general relativistic form f(R)=R-2\Lambda. The other three forms in each era, reproduce the LCDM cosmic history but they do not satisfy requirement b. stated above. Only one of these forms (different from general relativity) is found to be an attractor of the dynamical cosmological evolution. It has (\Omega_DE=1, \Omega_r=0, \Omega_m=0) throughout the evolution. Its phase space trajectory is numerically obtained.
hep-th/0703005 [abs, ps, pdf, other] :: Title: Reissner-Nordstrom Expansion
Authors: Emil M. Prodanov, Rossen I. Ivanov, V.G. Gueorguiev
Comments: 9 pages, LaTeX
Journal-ref: Astroparticle Physics 27, 150-154 (2007)

We propose a classical mechanism for the cosmic expansion during the radiation-dominated era. This mechanism assumes that the Universe is a two-component gas. The first component is a gas of ultra-relativistic "normal" particles described by an equation of state of an ideal quantum gas of massless particles. The second component consist of "unusual" charged particles (namely, either with ultra-high charge or with ultra-high mass) that provide the important mechanism of expansion due to their interaction with the "normal" component of the gas. This interaction is described by the Reissner--Nordstr\"om metric purely geometrically -- the ``unusual'' particles are modeled as zero-dimensional naked singularities inside spheres of gravitational repulsion. The radius of a repulsive sphere is inversely proportional to the energy of an incoming particle or the temperature. The expansion mechanism is based on the inflating of the "unusual" particles (of charge $Q$) with the drop of the temperature -- this drives apart all neutral particles and particles of specific charge $q/m$ such that ${sign}(Q) q/m \ge - 1$. The Reissner--Nordstr\"om expansion naturally ends at recombination. We discuss the range of model parameters within which the proposed expansion mechanism is consistent with the restrictions regarding quantum effects.
hep-th/0703007 [abs, ps, pdf, other] :: Title: Stretching the Inflaton Potential with Kinetic Energy
Authors: James E. Lidsey
Comments: 4 pages

Inflation near a maximum of the potential is studied when non-local derivative operators are included in the inflaton Lagrangian. Such terms can impose additional sources of friction on the field. For an arbitrary spacetime geometry, these effects can be quantified in terms of a local field theory with a potential whose curvature around the turning point is strongly suppressed. This implies that a prolonged phase of slow-roll inflation can be achieved with potentials that are otherwise too steep to drive quasi-exponential expansion. We illustrate this mechanism within the context of p-adic string theory.

Replacements

astro-ph/0309762 [abs, pdf] :: Title: Galactic mass distribution without dark matter or modified Newtonian mechanics
Authors: Kenneth F. Nicholson
Comments: 16 pages, 15 figures
Note: replaced with revised version Fri, 2 Mar 2007 01:03:49 GMT (536kb)
astro-ph/0510207 [abs, ps, pdf, other] :: Title: Dark energy in hybrid inflation
Authors: Jinn-Ouk Gong, Seongcheol Kim
Comments: (v1) 10 pages, 1 figure; (v2) 12 pages, considerably revised, to appear in Physical Review D
Note: replaced with revised version Fri, 2 Mar 2007 11:10:36 GMT (23kb)
astro-ph/0510803 [abs, ps, pdf, other] :: Title: Search for Global Metric Anisotropy in Type Ia Supernova Data
Authors: Pankaj Jain, Moninder S. Modgil, John P. Ralston
Comments: 16 pages, 2 figures, minor changes, to be published in Modern Physics Letters A
Note: replaced with revised version Fri, 2 Mar 2007 04:54:07 GMT (24kb)
astro-ph/0608116 [abs, ps, pdf, other] :: Title: The isocurvature fraction after WMAP 3-year data
Authors: Roberto Trotta (Oxford University)
Comments: Expanded discussion of degeneracies, updated references, no change to conclusions. Matches published version
Journal-ref: Mon, Not. R. Astron. Soc. 375, L26-L30 (2007)
Note: replaced with revised version Fri, 2 Mar 2007 12:33:26 GMT (22kb)
astro-ph/0608349 [abs, ps, pdf, other] :: Title: Empirical Corrections for Charge Transfer Inefficiency and Associated Centroid Shifts for STIS CCD Observations
Authors: Paul Goudfrooij (STScI), Ralph C. Bohlin (STScI), Jesus Maiz-Apellaniz (STScI/ESA), Randy A. Kimble (NASA/GSFC)
Comments: 49 pages in AASTeX preprint format. 18 figures, 8 tables
Journal-ref: Published in PASP, v. 848, p. 1455-1473 (2006)
Note: replaced with revised version Fri, 2 Mar 2007 20:29:48 GMT (790kb)
astro-ph/0610296 [abs, ps, pdf, other] :: Title: Non-Gaussianities in Multi-field Inflation
Authors: Thorsten Battefeld, Richard Easther
Comments: 23 pages; v.3: minor extensions to match version accepted in JCAP
Note: replaced with revised version Fri, 2 Mar 2007 12:36:25 GMT (20kb)
astro-ph/0611144 [abs, ps, pdf, other] :: Title: Limits on the Radiative Decay of Sterile Neutrino Dark Matter from the Unresolved Cosmic and Soft X-ray Backgrounds
Authors: Kevork N. Abazajian, Maxim Markevitch, Savvas M. Koushiappas, Ryan C. Hickox
Comments: 8 pages, 4 figures, v2: matches version to appear in Phys. Rev. D
Note: replaced with revised version Fri, 2 Mar 2007 12:03:17 GMT (68kb)
astro-ph/0612104 [abs, ps, pdf, other] :: Title: Redshift Filtering by Swift Apparent X-ray Column Density
Authors: Dirk Grupe (PSU), John A. Nousek (PSU), Daniel E. vanden Berk (PSU), Peter W.A. Roming (PSU), David N. Burrows (PSU), Olivier Godet (U. Leicester), Julian Osborne (U Leicester), Neil Gehrels (NASA/GSFC)
Comments: revised version including updates and the referee's comments, accepted for publication in the Astronomical Journal, 12 pages, 2 figures, 2 tables - v3 contains an update on the reference list
Note: replaced with revised version Fri, 2 Mar 2007 17:20:09 GMT (29kb)
astro-ph/0612517 [abs, ps, pdf, other] :: Title: Dynamics of triple black hole systems in hierarchically merging massive galaxies
Authors: Loren Hoffman, Abraham Loeb
Comments: accepted for publication in MNRAS, 2007
Note: replaced with revised version Fri, 2 Mar 2007 17:58:33 GMT (184kb)
astro-ph/0701705 [abs, ps, pdf, other] :: Title: The role of afterglow break-times as GRB jet angle indicators
Authors: L. Nava (1,2), G. Ghisellini (1), G. Ghirlanda (1), J.I. Cabrera (3), C. Firmani (1,3), V. Avila-Reese (3) ((1)INAF-OAB, (2)Univ. Insubria, (3)U.N.A.M.)
Comments: 10 pages, 8 figures, 2 tables. Title changed. Accepted for publication in MNRAS
Note: replaced with revised version Fri, 2 Mar 2007 10:28:16 GMT (305kb)
gr-qc/0701164 [abs, ps, pdf, other] :: Title: Large Merger Recoils and Spin Flips From Generic Black-Hole Binaries
Authors: Manuela Campanelli, Carlos O. Lousto, Yosef Zlochower, David Merritt
Comments: 4 pages. Accepted for publication in ApJL
Note: replaced with revised version Fri, 2 Mar 2007 15:14:55 GMT (35kb)
hep-ph/0612291 [abs, ps, pdf, other] :: Title: Constraints on the Reheating Temperature in Gravitino Dark Matter Scenarios
Authors: Josef Pradler, Frank Daniel Steffen
Comments: 13 pages, 15 figures, revised version accepted for publication (reheating phase considered, improved treatment of entropy production, revised last section, references added)
Note: replaced with revised version Fri, 2 Mar 2007 19:38:13 GMT (600kb)
physics/0606083 [abs, ps, pdf, other] :: Title: The $H_3^+$ molecular ion in a magnetic field in linear parallel configuration
Authors: A. V. Turbiner, N. L. Guevara, J. C. López Vieyra
Comments: 27 pages, 6 figures, 12 tables (the text expanded, several new references added, typos corrected)
Subj-class: Atomic Physics; Chemical Physics; Strongly Correlated Electrons
Note: replaced with revised version Fri, 2 Mar 2007 19:29:15 GMT (59kb)

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Cross-listings

gr-qc/0703002 [abs, ps, pdf, other] :: Title: Non-Metric Gravity I: Field Equations
Authors: Kirill Krasnov
Comments: 21 pages, no figures

We describe and study a certain class of modified gravity theories. Our starting point is Plebanski formulation of gravity in terms of a tripple of 2-forms, a connection A and a ``Lagrange multiplier'' field Psi. The generalization we consider stems from presence in the action of an extra term proportional to a scalar function of Psi. As in the usual Plebanski general relativity (GR) case, the equations coming from variations with respect to Psi imply that a certain metric can be introduced. However, unlike in GR, the connection A no longer coincides with the self-dual part of the metric-compatible spin-connection. Field equations of the theory are shown to be relations between derivatives of the metric and components of field Psi, as well as its derivatives, the later being in contrast to the GR case. The equations are of second order in derivatives. An analog of the Bianchi identity is still present in the theory, as well as its contracted version tantamount to energy conservation equation. The arising modifications to the later are possibly of experimental significance.
gr-qc/0703017 [abs, ps, pdf, other] :: Title: The impact of the Kuiper Belt Objects and of the asteroid ring on future high-precision relativistic Solar System tests
Authors: Lorenzo Iorio
Comments: Latex, 8 pages, no figures, no tables. Two references added. Impact of the asteroid ring included
Subj-class: General Relativity and Quantum Cosmology; Space Physics

We preliminarily investigate the impact of the Kuiper Belt Objects (KBOs) and of the asteroid ring on some proposed high-precision tests of Newtonian and post-Newtonian gravity to be performed in the Solar System by means of spacecraft in heliocentric \approx 1 AU orbits and accurate orbit determination of some of the inner planets. It turns out that the Classical KBOSs (CKBOS), which amount to \approx 70% of the observed population of Trans-Neptunian bodies, induce a systematic secular error of about 1 m after one year in the transverse direction T of the orbit of a test particle orbiting at 1 AU from the Sun. For Mercury the ratios of the secular perihelion precessions induced by CKBOs to the ones induced by the general relativity and the solar oblateness J_2 amount to 6 10^-7 and 8 10^-4, respectively. The secular transverse perturbation induced on a \approx 1 AU orbit by the asteroid ring, which globally accounts for the action of the minor asteroids whose mass is about 5 10^-10 solar masses, is 10 m yr^-1; the bias on the relativistic and J_2 Mercury perihelion precessions is 6.1 10^-6 and 1 10^-2, respectively. Given the very ambitious goals of many expensive and complex missions aimed to testing gravitational theories to unprecedented levels of accuracy, these notes may suggest further and more accurate investigations of such sources of potentially insidious systematic bias.
hep-ph/0703014 [abs, ps, pdf, other] :: Title: Some Comments on an MeV Cold Dark Matter Scenario
Authors: Chen Jacoby, Shmuel Nussinov
Comments: 12 pages, 2 figures

We discuss several aspects of astro-particle physics pertaining to a new model with MeV cold dark matter particles, which annihilate to electron-positron pairs in a manner yielding the correct CDM density required today, and explaining the enhanced electron-positron annihilation line from the center of the Galaxy. We note that the mass of the vector meson mediating the annihilations, should exceed the mass of CDM particle, and comment on possible enhancement due to CDM clustering, on the detectability of the new CDM, and on particle physics models incorporating this scenario.
hep-th/0610140 [abs, ps, pdf, other] :: Title: Can Hawking temperatures be negative ?
Authors: Mu-In Park
Comments: Some physical origin of the discrepancy with the standard analysis are noted, references added, 12 pages
Subj-class: High Energy Physics - Theory; Mathematical Physics; Statistical Mechanics

It has been widely believed that the Hawking temperature for a black hole is $uniquely$ determined by its metric and $positive$. But, I find that this does ``not'' seem to be true in the recently discovered black holes which include the exotic black holes and the black holes in the three-dimensional higher curvature gravities. I show that the Hawking temperatures, which are measured by the quantum fields in thermal equilibrium with the black holes, are $not$ the usual Hawking temperature but the $new$ temperatures that have been proposed recently and can be $negative$. The associated new entropy formulae, which are defined by the first law of thermodynamics, versus the black hole masses show some genuine effects of the black holes which do not occur in the spin systems. Some cosmological implications and physical origin of the discrepancy with the standard analysis are noted also.
hep-th/0702192 [abs, ps, pdf, other] :: Title: The Universe as a topological defect
Authors: Andres Anabalon, Steven Willison, Jorge Zanelli
Comments: 20 pages, LaTex, 2 figures

Four-dimensional Einstein's General Relativity is shown to arise from a gauge theory for the conformal group, SO(4,2). The theory is constructed from a topological dimensional reduction of the six-dimensional Euler density integrated over a manifold with a four-dimensional topological defect. The resulting action is a four-dimensional theory defined by a gauged Wess-Zumino-Witten term. There is a pure gravitational sector in which the Einstein's field equations hold and the unique coupling constant in the action is shown to be restricted to take integer values.
hep-th/0702217 [abs, ps, pdf, other] :: Title: Cosmological Perturbations in Non-Commutative Inflation
Authors: Seoktae Koh, Robert H. Brandenberger
Comments: 7 pages, 1 figure

We compute the spectrum of cosmological perturbations in a scenario in which inflation is driven by radiation in a non-commutative space-time. In this scenario, the non-commutativity of space and time leads to a modified dispersion relation for radiation with two branches, which allows for inflation. The initial conditions for the cosmological fluctuations are thermal. This is to be contrasted with the situation in models of inflation in which the accelerated expansion of space is driven by the potential energy of a scalar field, and in which the fluctuations are of quantum vacuum type. We find that, in the limit that the expansion of space is almost exponential, the spectrum of fluctuations is scale-invariant with a slight red tilt. The magnitude of the tilt is different from what is obtained in a usual inflationary model with the same expansion rate during the period of inflation. The amplitude also differs, and can easily be adjusted to agree with observations.

Replacements

astro-ph/0504022 [abs, ps, pdf, other] :: Title: Applications of Bayesian model selection to cosmological parameters
Authors: Roberto Trotta
Comments: Major revision: new results using WMAP 3-yr data, scale-invariant spectrum now disfavoured with moderate evidence. Comparison with WMAP 1st yr data release and update discussion of the prior dependence. New benchmark test for the accuracy of the method, statistical errors added to the results. Bayes factor forecast methodology (PPOD, formerly called ExPO) expanded and now presented in a companion paper (astro-ph/0703063)
Note: replaced with revised version Sat, 3 Mar 2007 20:24:11 GMT (60kb)
astro-ph/0603126 [abs, ps, pdf, other] :: Title: Analysing the atolls: X-ray spectral transitions of accreting neutron stars
Authors: Jeanette Gladstone, Chris Done, Marek Gierlinski
Comments: Accepted for publication in MNRAS
Note: replaced with revised version Mon, 5 Mar 2007 09:10:00 GMT (775kb)
astro-ph/0606259 [abs, ps, pdf, other] :: Title: The Anomalous X-Ray Pulsar 4U 0142+61: A Neutron Star with a Gaseous Fallback Disk
Authors: U. Ertan, M. H. Erkut, K.Y. Eksi, M.A. Alpar
Comments: 22 pages, 3 figures, minor revisons, appeared in Apj
Journal-ref: The Astrophysical Journal, 657, 441, 2007 March 1
Note: replaced with revised version Mon, 5 Mar 2007 15:05:34 GMT (32kb)
astro-ph/0607411 [abs, ps, pdf, other] :: Title: Modifying gravity with the Aether: an alternative to Dark Matter
Authors: T.G Zlosnik, P.G Ferreira, G.D Starkman
Comments: Published version
Journal-ref: Phys.Rev. D75 (2007) 044017
Note: replaced with revised version Sat, 3 Mar 2007 16:21:21 GMT (14kb)
astro-ph/0608117 [abs, ps, pdf, other] :: Title: Hydrogen and helium line formation in OB dwarfs and giants. A hybrid non-LTE approach
Authors: M.F. Nieva, N. Przybilla
Comments: 25 pages, 19 figures. Modified according to suggestions of the referee. Accepted for publication in A&A. Several figures in low resolution. A high-resolution pdf version of the preprint can be downloaded from this http URL
Note: replaced with revised version Mon, 5 Mar 2007 13:08:04 GMT (539kb)
astro-ph/0610181 [abs, ps, pdf, other] :: Title: Evidence for the importance of resonance scattering in X-ray emission line profiles of the O star $\zeta$ Puppis
Authors: Maurice A. Leutenegger, Stanley P. Owocki, Steven M. Kahn, Frits B. S. Paerels
Comments: 29 pages, 8 figures, revised version accepted by ApJ
Note: replaced with revised version Sat, 3 Mar 2007 17:13:48 GMT (73kb)
astro-ph/0701212 [abs, ps, pdf, other] :: Title: Dark energy is the cosmological quantum vacuum energy of light particles. The axion and the lightest neutrino
Authors: H. J. de Vega, N. G. Sanchez
Comments: 24 pages, 1 figure, 1 table
Note: replaced with revised version Fri, 2 Mar 2007 21:01:02 GMT (31kb)
astro-ph/0701432 [abs, ps, pdf, other] :: Title: Inflation over the hill
Authors: Konstantinos Tzirakis, William H. Kinney
Comments: 10 pages, 1 figure (V2: references added. Version submitted to PRD)
Note: replaced with revised version Fri, 2 Mar 2007 21:42:49 GMT (20kb)
astro-ph/0701446 [abs, ps, pdf, other] :: Title: Constraints on the unified dark energy-dark matter model from latest observational data
Authors: Puxun Wu, Hongwei Yu
Comments: 12 pages, 4 figures,accepted for publication in JCAP
Note: replaced with revised version Sat, 3 Mar 2007 03:59:18 GMT (197kb)
astro-ph/0702181 [abs, ps, pdf, other] :: Title: Bulk viscosity in nuclear and quark matter: A short review
Authors: Hui Dong, Nan Su, Qun Wang
Comments: A section is added to discuss the constraints from baryon number conservation and charge neutrality in bulk viscosity
Note: replaced with revised version Mon, 5 Mar 2007 00:27:33 GMT (9kb)
astro-ph/0702198 [abs, ps, pdf, other] :: Title: Diffuse source separation in CMB observations
Authors: J. Delabrouille, J.-F. Cardoso
Comments: 47 pages, lecture paper for the international summer school 'Data Analysis in Cosmology', 6-10 september 2005, Valencia, Spain
Note: replaced with revised version Fri, 2 Mar 2007 22:25:35 GMT (1240kb)
astro-ph/0702542 [abs, ps, pdf, other] :: Title: Tainted Evidence: Cosmological Model Selection vs. Fitting
Authors: Eric V. Linder, Ramon Miquel
Comments: 5 pages, 1 figure; v2 minor rephrasings, clarifications
Note: replaced with revised version Sun, 4 Mar 2007 17:07:51 GMT (49kb)
astro-ph/0702549 [abs, ps, pdf, other] :: Title: Turbulent Torques on Protoplanets in a Dead Zone
Authors: Jeffrey S. Oishi, Mordecai-Mark Mac Low, Kristen Menou
Comments: 34 pages, 12 figures. submitted to ApJ
Note: replaced with revised version Mon, 5 Mar 2007 15:22:29 GMT (707kb)
astro-ph/0702613 [abs, ps, pdf, other] :: Title: Neutrino Spectrum from SN 1987A and from Cosmic Supernovae
Authors: Hasan Yuksel, John F. Beacom (Ohio State University)
Comments: 9 pages, 4 figures; references added, corrected typos, submitted to PRD
Note: replaced with revised version Sun, 4 Mar 2007 21:06:15 GMT (66kb)
gr-qc/0604006 [abs, ps, pdf, other] :: Title: Metric-affine f(R) theories of gravity
Authors: Thomas P. Sotiriou, Stefano Liberati
Comments: typos corrected, replaced to match published version
Journal-ref: Ann. Phys. 322, 935 (2007)
Note: replaced with revised version Mon, 5 Mar 2007 19:14:48 GMT (32kb)
gr-qc/0701130 [abs, ps, pdf, other] :: Title: Unruh Effect for General Trajectories
Authors: N. Obadia, M. Milgrom
Comments: 17 pages, 9 figures, one paragraph added, version accepted in Phys.Rev.D
Note: replaced with revised version Sun, 4 Mar 2007 11:28:46 GMT (452kb)
gr-qc/0702009 [abs, ps, pdf, other] :: Title: Why do we Still Believe in Newton's Law ? Facts, Myths and Methods in Gravitational Physics
Authors: Alexander Unzicker
Comments: 30 pages LaTeX, 2 figures. V2: typos corrected, some references and two paragraphs added
Note: replaced with revised version Sun, 4 Mar 2007 20:41:47 GMT (154kb)
hep-th/0702121 [abs, ps, pdf, other] :: Title: Dark energy, the cosmic coincidence, and entanglement
Authors: Hyeong-Chan Kim, Jae-Weon Lee, Jungjai Lee
Comments: 5 pages, 3 figures, revtex, naturalness of parameters are argued
Note: replaced with revised version Mon, 5 Mar 2007 09:42:01 GMT (123kb)
nucl-th/0605070 [abs, ps, pdf, other] :: Title: A New Family of Simple Solutions of Perfect Fluid Hydrodynamics
Authors: T. Csorgo, M. I. Nagy, M. Csanad
Comments: 10 pages, 5 figures, revised version emphasizes entropy conservation instead of charge conservation. Includes a fit of calculated dn/dy to BRAHMS dn/dy measurement, and lists all the members of the considered class of exact solutions
Subj-class: Nuclear Theory; Fluid Dynamics
Note: replaced with revised version Mon, 5 Mar 2007 15:49:57 GMT (27kb)
nlin.CD/0603070 [abs, ps, pdf, other] :: Title: Beyond scaling and locality in turbulence
Authors: A. Bershadskii
Comments: extended version
Subj-class: Chaotic Dynamics; Statistical Mechanics
Note: replaced with revised version Sun, 4 Mar 2007 17:07:00 GMT (298kb)
math-ph/0702095 [abs, ps, pdf, other] :: Title: Geometrical modification of quaternionic quantum mechanics
Authors: Vladimir Trifonov
Comments: Latex, 29 pages, minor changes
Subj-class: Mathematical Physics
MSC-class: 81P10; 83F05 (primary), 53Z05; 53A17 (secondary)
Note: replaced with revised version Mon, 5 Mar 2007 02:50:13 GMT (21kb)

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gr-qc/0703012 [abs, ps, pdf, other] :: Title: Luminosity distance-redshift relation for the LTB solution near the center
Authors: Masayuki Tanimoto, Yasusada Nambu
Comments: 16 pages, 1 figure

Motivated by the inverse problem for the Lemaitre-Tolman-Bondi dust solution, in which problem the luminosity distance function $D_L(z)$ is taken as an input to select a specific model, we compute the function $D_L(z)$ of the LTB solution up to third order of $z$. To perform the otherwise cumbersome computation, we introduce a new convenient form of the LTB solution, in which the solution is explicit and unified. With this form of the LTB solution we obtain the luminosity distance function with the full generality. We in particular find that the function exactly coincides with that of a homogeneous and isotropic dust solution up to second order, if we demand that the solution be regular at the center.
gr-qc/0703021 [abs, ps, pdf, other] :: Title: Probing Dynamical Dark Energy with Press-Schechter Mass Functions
Authors: Morgan Le Delliou (CFTC)
Comments: submitted to the Proceedings of the 11th Marcel Grossmann Meeting, MG11, Berlin, Germany, July 23-29, 2006 (2007) to be published

Measurement of accelerated expansion in the Universe led to propose a new cosmic fluid as its cause: dark energy. Its various incarnations offer a wealth of models whose relevance it is important to discriminate via contacts with observations. I will present my investigations on the influence of dynamical dark energy models on the formation of non-linear dark matter structures. In particular, I will focus on structures traced by the mass function of dark matter haloes.
hep-ph/0703001 [abs, ps, pdf, other] :: Title: The Higgs field can be expressed through the lepton and quark fields
Authors: Ruslan Sharipov
Comments: AmSTeX, 4 pages, amsppt style
Subj-class: High Energy Physics - Phenomenology; Mathematical Physics

The Higgs field is a central point of the Standard Model supplying masses to other fields through the symmetry breaking mechanism. However, it is associated with an elementary particle which is not yet discovered experimentally. In this short note I suggest a way for expressing the Higgs field through other fields of the Standard Model. If this is the case, being not an independent field, the Higgs field does not require an elementary particle to be associated with it.
hep-th/0702229 [abs, ps, pdf, other] :: Title: IR Inflation from Multiple Branes
Authors: Steven thomas, John Ward
Comments: 45 pages; added references and an additional comment to the discussion

In this paper we examine the IR inflation scenario using the DBI action, where we have $N$ multiple branes located near the tip of a warped geometry. At large $N$ the solutions are similar in form to the more traditional single brane models, however we find that it is difficult to simultaneously satisfy the WMAP bounds on the scalar amplitude and the scalar spectral index. We go on to examine two new solutions where N=2 and N=3 respectively, which both have highly non-linear actions. The sound speed in both cases is dramatically different from previous works, and for the N=3 case it can actually be zero. We show that inflation is possible in both frameworks, and find that the scalar spectral index is bounded from above by unity. The level of non-gaussian fluctuations are smaller in the N=2 case compared to the single brane models, whilst those in the N=3 case are much larger.
hep-th/0703040 [abs, ps, pdf, other] :: Title: Ekpyrotic collapse with multiple fields
Authors: Kazuya Koyama, David Wands
Comments: 13 pages, 1 figure

A scale invariant spectrum of isocurvature perturbations is generated during collapse in the scaling solution in models where two or more fields have steep negative exponential potentials. The scale invariance of the spectrum is realised by a tachyonic instability in the isocurvature field. We show that this instability is due to the fact that the scaling solution is a saddle point in the phase space. The late time attractor is identified with a single field dominated ekpyrotic collapse in which a steep blue spectrum for isocurvature perturbations is found. Although quantum fluctuations do not necessarily to disrupt the classical solution, an additional preceding stage is required to establish classical homogeneity.
math-ph/0703016 [abs, ps, pdf, other] :: Title: Plasma planar filament instability and Alfven waves
Authors: Garcia de Andrade
Subj-class: Mathematical Physics; Differential Geometry; Plasma Physics

Inhomogeneous plasmas filaments instabilities are investigated by using the techniques of classical differential geometry of curves where Frenet torsion and curvature describe completely the motion of curves. In our case the Frenet frame changes in time and also depends upon the other coordinates taking into account the inhomogeneity of the plasma. The exponential perturbation method so commonly used to describe cosmological perturbatons is applied to magnetohydrodynamic (MHD) plasma equations to find longitudinal modes describing Alfven waves propagation modes describing plasma waves in the medium. Stability is investigated in the imaginary axis of the spectra of complex frequencies ${\omega}$ or $Im(\omega)\ne{0}$.

Replacements

hep-ph/9304242 [abs, ps, pdf, other] :: Title: Origin of spontaneous violation of the Lorentz symmetry: Vortices in the cosmos
Authors: D. V. Ahluwalia, T. Goldman
Comments: This is an exact copy of the published paper with an extended bibliography and a revised title. A brief note is added to point out a systematic way to spontaneously break Lorentz symmetry
Journal-ref: Mod.Phys.Lett. A8 (1993) 2623-2630
Note: replaced with revised version Tue, 6 Mar 2007 01:40:58 GMT
astro-ph/0602338 [abs, ps, pdf, other] :: Title: A New Approach to the Optimal Target Selection Problem
Authors: E. C. Elson, B. A. Bassett, K. van der Heyden, Z. Z. Vilakazi
Comments: 10 pages, 14 figures, Extended version accepted to Astron. Astrophys
Subj-class: Astrophysics; Disordered Systems and Neural Networks
Note: replaced with revised version Tue, 6 Mar 2007 10:56:18 GMT (457kb)
astro-ph/0602573 [abs, ps, pdf, other] :: Title: GalaxyCount: a JAVA calculator of galaxy counts and variances in multiband wide-field surveys to 28 AB mag
Authors: S.C. Ellis, J. Bland-Hawthorn (AAO)
Comments: Accepted for publication in MNRAS. This version contains many significant improvements on the previous version, including: rigorous treatment of completeness in magnitude limited surveys, the effect of the window function, and examination of the perceived usefulness of offset fields. The accompanying JAVA tool is easy to use, freely available and can be downloaded, ready to use in seconds
Note: replaced with revised version Tue, 6 Mar 2007 00:20:28 GMT (178kb)
astro-ph/0603601 [abs, ps, pdf, other] :: Title: Early and Late Transient Cosmic Acceleration due to Curvature Inspired Dark Energy
Authors: S.K.Srivastava
Comments: 16pages. To appear in Physics Letters B
Note: replaced with revised version Tue, 6 Mar 2007 09:19:32 GMT (9kb)
astro-ph/0610173 [abs, ps, pdf, other] :: Title: Theory Challenges of the Accelerating Universe
Authors: Eric V. Linder
Comments: 10 pages, 4 figures; minor changes to match J. Phys. A version
Note: replaced with revised version Mon, 5 Mar 2007 21:07:21 GMT (30kb)
astro-ph/0610600 [abs, ps, pdf, other] :: Title: Limits on f_NL parameters from WMAP 3yr data
Authors: Paolo Creminelli, Leonardo Senatore, Matias Zaldarriaga, Max Tegmark
Comments: 10 pages, 3 figures; v2: added some comments and equations, corrected the comments on the constraint on the speed of sound
Note: replaced with revised version Mon, 5 Mar 2007 22:16:10 GMT (168kb)
astro-ph/0610854 [abs, ps, pdf, other] :: Title: Solar System tests disfavor $f(R)$ gravities
Authors: Xing-hua Jin, Dao-jun Liu, Xin-zhou Li
Comments: 7 pages, no figure. some discussions and references added; typos corrected minor revision
Note: replaced with revised version Tue, 6 Mar 2007 09:04:57 GMT (6kb)
astro-ph/0612102 [abs, ps, pdf, other] :: Title: Dark Energy with a Fine-toothed Comb
Authors: Eric V. Linder
Comments: 6 pages, 3 figures; minor changes to match PRD version
Note: replaced with revised version Mon, 5 Mar 2007 21:20:15 GMT (21kb)
astro-ph/0701151 [abs, ps, pdf, other] :: Title: The CMB Dipole and Circular Galaxy Distribution
Authors: Yukio Tomozawa
Comments: 9 pages, 3 figures (10 figure captions), 1 table
Note: replaced with revised version Tue, 6 Mar 2007 20:14:30 GMT (8kb)
astro-ph/0702587 [abs, ps, pdf, other] :: Title: Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal
Authors: Douglas P. Finkbeiner (CfA), Neal Weiner (CCPP, NYU)
Comments: 18 pages; v2 references added
Note: replaced with revised version Tue, 6 Mar 2007 09:51:10 GMT (31kb)
astro-ph/0703043 [abs, ps, pdf, other] :: Title: A description of sources detected by INTEGRAL during the first 4 years of observations
Authors: A. Bodaghee, T.J.-L. Courvoisier, J. Rodriguez, V. Beckmann, N. Produit, D. Hannikainen, E. Kuulkers, D.R. Willis, G. Wendt
Comments: 36 pages, 16 figures, 1 long table, accepted for publication in A&A (as of 23-2-07)
Note: replaced with revised version Tue, 6 Mar 2007 14:38:03 GMT (230kb)
gr-qc/0612094 [abs, ps, pdf, other] :: Title: Formation of Three-Dimensional Black Strings from Gravitational Collapse of Dust Cloud
Authors: Seungjoon Hyun, Jaehoon Jeong, Wontae Kim, John J. Oh
Comments: LaTeX, 12 pages, 6 figures, dilaton radiation considered, some sections rearranged, and some references added
Note: replaced with revised version Tue, 6 Mar 2007 08:05:30 GMT (77kb)
hep-ph/0612286 [abs, ps, pdf, other] :: Title: A Dark Matter Candidate from an Extra (Non-Universal) Dimension
Authors: Marco Regis, Marco Serone, Piero Ullio
Comments: 26 pages, 10 figures; v2: fig.1 corrected, one reference and some comments added, conclusions unchanged. Version to appear in JHEP
Note: replaced with revised version Tue, 6 Mar 2007 17:25:47 GMT (114kb)
hep-th/0610140 [abs, ps, pdf, other] :: Title: Can Hawking temperatures be negative ?
Authors: Mu-In Park
Comments: Typos corrected
Subj-class: High Energy Physics - Theory; Mathematical Physics; Statistical Mechanics
Note: replaced with revised version Tue, 6 Mar 2007 05:35:49 GMT (37kb)
nucl-th/0611024 [abs, ps, pdf, other] :: Title: Dependence of the BCS 1S0 superfluid pairing gap on nuclear interactions
Authors: K. Hebeler, A. Schwenk, B. Friman
Comments: 11 pages, 4 figures, minor changes, to appear in Phys. Lett. B
Note: replaced with revised version Mon, 5 Mar 2007 22:38:34 GMT (28kb)

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gr-qc/0701133 [abs, ps, pdf, other] :: Title: A general class of braneworld wormholes
Authors: Francisco S. N. Lobo
Comments: 6 pages, Revtex4. V2: comments and references added, to appear in Phys. Rev. D

The brane cosmology scenario is based on the idea that our Universe is a 3-brane embedded in a five-dimensional bulk. In this work, a general class of braneworld wormholes is explored with $R\neq 0$, where $R$ is the four dimensional Ricci scalar, and specific solutions are further analyzed. A fundamental ingredient of traversable wormholes is the violation of the null energy condition (NEC). However, it is the effective total stress energy tensor that violates the latter, and in this work, the stress energy tensor confined on the brane, threading the wormhole, is imposed to satisfy the NEC. It is also shown that in addition to the local high-energy bulk effects, nonlocal corrections from the Weyl curvature in the bulk may induce a NEC violating signature on the brane. Thus, braneworld gravity seems to provide a natural scenario for the existence of traversable wormholes.
gr-qc/0703028 [abs, ps, pdf, other] :: Title: Towards adiabatic waveforms for inspiral into Kerr black holes: I. A new model of the source for the time domain perturbation equation
Authors: Pranesh A. Sundararajan, Gaurav Khanna, Scott A. Hughes
Comments: 20 pages, 5 figures, submitted to PRD

We revisit the problem of the emission of gravitational waves from a test mass orbiting and thus perturbing a Kerr black hole. The source term of the Teukolsky perturbation equation contains a Dirac delta function which represents a point particle. We present a technique to effectively model the delta function and its derivatives using as few as four points on a numerical grid. The source term is then incorporated into a code that evolves the Teukolsky equation in the time domain as a (2+1) dimensional PDE. The waveforms and energy fluxes are extracted far from the black hole. Our comparisons with earlier work show an order of magnitude gain in performance (speed) and numerical errors less than 1% for a large fraction of parameter space. As a first application of this code, we analyze the effect of finite extraction radius on the energy fluxes. This paper is the first in a series whose goal is to develop adiabatic waveforms describing the inspiral of a small compact body into a massive Kerr black hole.
gr-qc/0703034 [abs, ps, pdf, other] :: Title: Post-Newtonian Approximations, Compact Binaries, and Strong-Field Tests of Gravity
Authors: Luc Blanchet, L P Grishchuk, Gerhard Schaefer
Comments: 14 pages, summary of PPN1 and PPN2 parallel sessions at MG11 (Berlin, August,2006)

This is an extended summary of the two parallel sessions held at MG11: PPN1 ``Strong Gravity and Binaries'' (chaired by L.B. and L.G.) and PPN2 ``Post-Newtonian Dynamics in Binary Objects'' (chaired by G.S.). The aims and contents of these sessions were close to each other and overlapping. It is natural to review both sessions in one joint contribution to the MG11 Proceedings. The summary places the delivered talks in a broader perspective of current studies in this area. One can find more details in individual contributions of the respective authors.
gr-qc/0703035 [abs, ps, pdf, other] :: Title: 3+1 Formalism and Bases of Numerical Relativity
Authors: Eric Gourgoulhon (LUTH, CNRS / Observatoire de Paris)
Comments: Lectures given at the General Relativity Trimester held in the Institut Henri Poincare (Paris, Sept.-Dec. 2006) and at the VII Mexican School on Gravitation and Mathematical Physics (Playa del Carmen, Mexico, 26. Nov. - 2 Dec. 2006), 220 pages, 25 figures. Corrections and suggestions are welcome
Subj-class: General Relativity and Quantum Cosmology; Differential Geometry

These lecture notes provide some introduction to the 3+1 formalism of general relativity, which is the foundation of most modern numerical relativity. The text is rather self-contained, with detailed calculations and numerous examples. Contents: 1. Introduction, 2. Geometry of hypersurfaces, 3. Geometry of foliations, 4. 3+1 decomposition of Einstein equation, 5. 3+1 equations for matter and electromagnetic field, 6. Conformal decomposition, 7. Asymptotic flatness and global quantities, 8. The initial data problem, 9. Choice of foliation and spatial coordinates, 10. Evolution schemes.
gr-qc/0703042 [abs, ps, pdf, other] :: Title: Reply to "The meaning of systematic errors, a comment to "Reply to On the Systematic Errors in the Detection of the Lense-Thirring Effect with a Mars Orbiter", by Lorenzo Iorio'', by G. Felici
Authors: Lorenzo Iorio
Comments: LaTex, 2 pages, no figures, no tables, 6 references. It refers to gr-qc/0703020, by G. Felici
Subj-class: General Relativity and Quantum Cosmology; Space Physics

In this note we reply to the criticisms by Felici concerning some aspects of the recent frame-dragging test performed by Iorio with the Mars Global Surveyor (MGS) spacecraft in the gravitational field of Mars.
hep-th/0702154 [abs, ps, pdf, other] :: Title: New Ekpyrotic Cosmology
Authors: Evgeny I. Buchbinder, Justin Khoury, Burt A. Ovrut
Comments: 40 pages, 4 figures. v2: minor corrections, references added

In this paper, we present a new scenario of the early Universe that contains a pre big bang Ekpyrotic phase. By combining this with a ghost condensate, the theory explicitly violates the null energy condition without developing any ghost-like instabilities.Thus the contracting universe goes through a non-singular bounce and evolves smoothly into the expanding post big bang phase. The curvature perturbation acquires a scale-invariant spectrum well before the bounce in this scenario. It is sourced by the scale-invariant entropy perturbation engendered by two ekpyrotic scalar fields, a mechanism recently proposed by Lehners et al. Since the background geometry is non-singular at all times, the curvature perturbation remains nearly constant on super horizon scales. It emerges from the bounce unscathed and imprints a scale-invariant spectrum of density fluctuations in the matter-radiation fluid at the onset of the hot big bang phase. The ekpyrotic potential can be chosen so that the spectrum has a "red" tilt, in accordance with the recent data from WMAP. As such "New Ekpyrotic Cosmology" provides a complete and consistent alternative to inflation to account for the origin of the seeds of large scale structure.
hep-th/0703027 [abs, ps, pdf, other] :: Title: Degravitation of the Cosmological Constant and Graviton Width
Authors: Gia Dvali, Stefan Hofmann, Justin Khoury
Comments: 49 pages, 4 figures

We study the possibility of decoupling gravity from the vacuum energy. This is effectively equivalent to promoting Newton's constant to a high-pass filter that degravitates sources of characteristic wavelength larger than a certain macroscopic (super) horizon scale L. We study the underlying physics and the consistency of this phenomenon. In particular, the absence of ghosts, already at the linear level, implies that in any such theory the graviton should either have a mass 1/L, or be a resonance of similar width. This has profound physical implications for the degravitation idea.
hep-th/0703055 [abs, ps, pdf, other] :: Title: String Theory and Pre-big bang Cosmology
Authors: M. Gasperini, G. Veneziano
Comments: 29 pages, three figures. Contribution to the book: "Beyond the Big Bang", ed. by Ruediger Vaas (Frontier Collection Series, Springer-Verlag, Heidelberg, 2007)

In string theory, the traditional picture of a Universe that emerges from the inflation of a very small and highly curved space-time patch is a possibility, not a necessity: quite different initial conditions are possible, and not necessarily unlikely. In particular, the duality symmetries of string theory suggest scenarios in which the Universe starts inflating from an initial state characterized by very small curvature and interactions. Such a state, being gravitationally unstable, will evolve towards higher curvature and coupling, until string-size effects and loop corrections make the Universe "bounce" into a standard, decreasing-curvature regime. In such a context, the hot big bang of conventional cosmology is replaced by a "hot big bounce" in which the bouncing and heating mechanisms originate from the quantum production of particles in the high-curvature, large-coupling pre-bounce phase. Thanks to the strong coupling there is also an associate production of higher-dimensional branes, which could prepare (and provide the initial conditions for) a subsequent phase of brane-dominated inflation.

Replacements

astro-ph/0511205 [abs, ps, pdf, other] :: Title: Is GRB 050904 a super-long burst?
Authors: Y. C. Zou, Z. G. Dai, D. Xu
Comments: 16 pages, 4 figure. Submitted on Oct. 21, 2005, accepted by ApJ
Journal-ref: Astrophys.J. 646 (2005) 1098-1103
Note: replaced with revised version Wed, 7 Mar 2007 03:09:12 GMT (45kb)
astro-ph/0603150 [abs, ps, pdf, other] :: Title: The Bound Mass of Substructures in Dark Matter Halos
Authors: L. D. Shaw, J. Weller, J.P. Ostriker, P. Bode
Comments: 15 pages, 16 figures, updated to match version accepted for publication in ApJ. Includes a new section (2.4) demonstrating the accuracy of our subhalo finding algorithm in measuring subhalo bound mass when applied to a sequence of snapshots of an N-body simulation
Note: replaced with revised version Wed, 7 Mar 2007 00:23:57 GMT (341kb)
astro-ph/0605637 [abs, ps, pdf, other] :: Title: Gravitational polarization and the phenomenology of MOND
Authors: Luc Blanchet
Comments: 10 pages, 1 figure, submitted to Classical and Quantum Gravity
Note: replaced with revised version Wed, 7 Mar 2007 13:10:56 GMT (14kb)
astro-ph/0607546 [abs, ps, pdf, other] :: Title: Self-consistent theory of turbulent transport in the solar tachocline. III. Stratification
Authors: Eun-Jin Kim (SPARG), Nicolas Leprovost (SPARG)
Note: replaced with revised version Wed, 7 Mar 2007 12:38:10 GMT (30kb)
astro-ph/0610267 [abs, ps, pdf, other] :: Title: Using long-term transit timing to detect terrestrial planets
Authors: Jeremy S. Heyl, Brett J. Gladman
Comments: 10 pages, 5 figures, accepted by Monthly Notices, updated to reflect accepted version
Note: replaced with revised version Wed, 7 Mar 2007 19:37:21 GMT (40kb)
astro-ph/0610420 [abs, ps, pdf, other] :: Title: Asteroseismological constraints on the pulsating planetary nebula nucleus (PG1159-type) RX J2117.1+3412
Authors: A. H. Córsico, L. G. Althaus, M. M. Miller Bertolami, K. Werner
Comments: 10 pages, 6 figures, 2 tables. Accepted for publication in Astronomy and Astrophysics. Erratum available as a separate file
Journal-ref: Astron.Astrophys. 461 (2007) 1095-1102
Note: replaced with revised version Wed, 7 Mar 2007 17:07:57 GMT (142kb)
astro-ph/0610480 [abs, ps, pdf, other] :: Title: IR Monitoring of the Microquasar GRS 1915+105: Detection of Orbital and Superhump Signatures
Authors: Ethan T. Neil, Charles D. Bailyn, Bethany E. Cobb
Comments: 16 pages, 6 figures; v2: minor changes
Journal-ref: Astrophys.J. 657 (2007) 409-414
Note: replaced with revised version Wed, 7 Mar 2007 03:51:18 GMT (66kb)
astro-ph/0612467 [abs, ps, pdf, other] :: Title: Dark matter annihilation or unresolved astrophysical sources? Anisotropy probe of the origin of cosmic gamma-ray background
Authors: Shin'ichiro Ando (Caltech), Eiichiro Komatsu (Univ. Texas at Austin), Takuro Narumoto, Tomonori Totani (Kyoto Univ.)
Comments: 17 pages, 8 figures; minor revision; accepted by Physical Review D
Note: replaced with revised version Wed, 7 Mar 2007 20:25:31 GMT (96kb)
astro-ph/0701519 [abs, ps, pdf, other] :: Title: Reconstruction of Deceleration Parameters from Recent Cosmic Observations
Authors: Lixin Xu, Chengwu Zhang, Baorong Chang, Hongya Liu
Comments: 7 pages, 3 figures, 4 tables. Observational Hubble data alone as a cosmic constraint is added. Some references are added. The whole paper has almost been rewritten completely
Note: replaced with revised version Wed, 7 Mar 2007 05:34:15 GMT (245kb)
astro-ph/0701568 [abs, ps, pdf, other] :: Title: The Electron Energy Distribution in the Hotspots of Cygnus A: Filling the Gap with the Spitzer Space Telescope
Authors: L. Stawarz, C.C. Cheung, D.E. Harris, M. Ostrowski
Comments: 29 pages, 8 figures and 2 tables included. Accepted for publication in ApJ
Note: replaced with revised version Tue, 6 Mar 2007 21:53:01 GMT (1499kb)
astro-ph/0702643 [abs, ps, pdf, other] :: Title: The Stellar Mass Tully-Fisher Relation to z=1.2 from AEGIS
Authors: Susan A. Kassin (1), Benjamin J. Weiner (2), S. M. Faber (1), David C. Koo (1), Jennifer M. Lotz (3), Jürg Diemand (1), Justin J. Harker (1), Kevin Bundy (4), A. J. Metevier (1), Andrew C. Phillips (1), Michael C. Cooper (5), Darren J. Croton (5), Nicholas Konidaris (1), Kai G. Noeske (1), C. N. A. Willmer (2) ((1) UCO/Lick Observatory, UC Santa Cruz, (2) Steward Observatory, (3) NOAO, (4) U Toronto, (5) UC Berkeley)
Comments: 5 pages including 1 color figure. Accepted for publication in the ApJL AEGIS Special Issue. Higher resolution figure can be found at this http URL ; NEW to Version 2: Press releases can be found at this http URL and this http URL
Note: replaced with revised version Tue, 6 Mar 2007 23:42:41 GMT (117kb)
astro-ph/0702648 [abs, ps, pdf, other] :: Title: Observing cosmic string loops with gravitational lensing surveys
Authors: Katherine J. Mack, Daniel H. Wesley, Lindsay J. King
Comments: 18 pages, 3 figures. v2: Minor changes to text, references added. Submitted to Phys Rev D
Note: replaced with revised version Wed, 7 Mar 2007 18:18:42 GMT (28kb)
astro-ph/0703045 [abs, ps, pdf, other] :: Title: HETE-2 Observations of the X-Ray Flash XRF 040916
Authors: Makoto Arimoto, Nobuyuki Kawai, Atsumasa Yoshida, Toru Tamagawa, Yuji Shirasaki, Motoko Suzuki, Masaru Matsuoka, Jun'ichi Kotoku, Rie Sato, Takashi Shimokawabe, Nicolas Vasquez Pazmino, Takuto Ishimura, Yujin Nakagawa, Nobuyuki Ishikawa, Akina Kobayashi, Satoshi Sugita, Ichiro Takahashi, Makoto Kuwahara, Makoto Yamauchi, Kunio Takagishi, Isamu Hatsukade, Jean-Luc Atteia, Alexandre Pelangeon, Roland Vanderspek, Carlo Graziani, Gregory Prigozhin, Joel Villasenor, J. Garrett Jernigan, Geoffrey B. Crew, Kevin Hurley, Takanori Sakamoto, George R. Ricker, Stanford E. Woosley, Nat Butler, Al Levine, John P. Doty, Timothy Q. Donaghy, Donald Q. Lamb, Edward E. Fenimore, Mark Galassi, Michel Boer, Jean-Pascal Dezalay, Jean-Francios Olive, Joao Braga, Ravi Manchanda, Graziella Pizzichini
Comments: 9 pages, 4 figures, Accepted for publication in PASJ
Note: replaced with revised version Wed, 7 Mar 2007 10:34:20 GMT (669kb)
gr-qc/0612056 [abs, ps, pdf, other] :: Title: Model-independent test of spatial variations of the Newtonian gravitational constant in some extrasolar planetary systems
Authors: Lorenzo Iorio
Comments: LaTex, 9 pages, no figures, 5 tables, 37 references. Abstract re-written, more references added. One reference corrected. Minor corrections in the Conclusions. To appear in Monthly Notices of the Royal Astronomical Society
Subj-class: General Relativity and Quantum Cosmology; Space Physics
Note: replaced with revised version Tue, 6 Mar 2007 22:04:31 GMT (10kb)
gr-qc/0701077 [abs, ps, pdf, other] :: Title: Possible Neutrino-Antineutrino Oscillation Under Gravity and its Consequences
Authors: Banibrata Mukhopadhyay
Comments: 3 pages; contribution to appear in the Proceedings of the MG11 Meeting on General Relativity, Berlin, July 23-29, 2006; prepared on the basis of the talk presented in the meeting; new version with updated references
Note: replaced with revised version Wed, 7 Mar 2007 05:24:25 GMT (30kb)
hep-th/0611246 [abs, ps, pdf, other] :: Title: A Stringy Alternative to Inflation: The Cosmological Slingshot Scenario
Authors: Cristiano Germani (DAMTP, KCL & SISSA), N.E. Grandi (IFLP-Conicet, ICTP & SISSA), Alex Kehagias (Natl. Tech. U., Athens)
Comments: v2: figures improved
Note: replaced with revised version Tue, 6 Mar 2007 21:25:00 GMT (104kb)
hep-th/0701255 [abs, ps, pdf, other] :: Title: On The Black Hole Interior Spacetime
Authors: Hristu Culetu
Comments: 6 pages,one reference added, minor changes, no figures
Note: replaced with revised version Wed, 7 Mar 2007 14:20:38 GMT (6kb)
math-ph/0606007 [abs, ps, pdf, other] :: Title: Natural FLRW metrics on the Lie group of nonzero quaternions
Authors: Vladimir Trifonov
Comments: A slightly more technical version of "Natural geometry of nonzero quaternions" IJTP 46 (2) (2007) 251-257
Subj-class: Mathematical Physics
MSC-class: 53C50 (Primary), 53B30, 22E30, 53B50 (Secondary)
Journal-ref: IJTP 46 (2) (2007) 251-257
Note: replaced with revised version Tue, 6 Mar 2007 22:00:06 GMT (7kb)

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gr-qc/0703033 [abs, ps, pdf, other] :: Title: Existence and Nonlinear Stability of Rotating Star Solutions of the Compressible Euler-Poisson Equations
Authors: Tao Luo, Joel Smoller
Subj-class: General Relativity and Quantum Cosmology; Analysis of PDEs

We prove existence of rotating star solutions which are steady-state solutions of the compressible isentropic Euler-Poisson (EP) equations in 3 spatial dimensions, with prescribed angular momentum and total mass. This problem can be formulated as a variational problem of finding a minimizer of an energy functional in a broader class of functions having less symmetry than those functions considered in the classical Auchmuty-Beals paper. We prove the nonlinear dynamical stability of these solutions with perturbations having the same total mass and symmetry as the rotating star solution. We also prove local in time stability of $W^{1, \infty}(\RR^3)$ solutions where the perturbations are entropy-weak solutions of the EP equations. Finally, we give a uniform (in time) a-priori estimate for entropy-weak solutions of the EP equations.
gr-qc/0703038 [abs, ps, pdf, other] :: Title: Late-time behaviour of the tilted Bianchi type VIh models
Authors: S Hervik, R J van den Hoogen, W C Lim, A A Coley
Comments: 34 pages, 13 figures

We study tilted perfect fluid cosmological models with a constant equation of state parameter in spatially homogeneous models of Bianchi type VI$_h$ using dynamical systems methods and numerical experimentation, with an emphasis on their future asymptotic evolution. We determine all of the equilibrium points of the type VI$_h$ state space (which correspond to exact self-similar solutions of the Einstein equations, some of which are new), and their stability is investigated. We find that there are vacuum plane-wave solutions that act as future attractors. In the parameter space, a `loophole' is shown to exist in which there are no stable equilibrium points. We then show that a Hopf-bifurcation can occur resulting in a stable closed orbit (which we refer to as the Mussel attractor) corresponding to points both inside the loophole and points just outside the loophole; in the former case the closed curves act as late-time attractors while in the latter case these attracting curves will co-exist with attracting equilibrium points. In the special Bianchi type III case, centre manifold theory is required to determine the future attractors. Comprehensive numerical experiments are carried out to complement and confirm the analytical results presented. We note that the Bianchi type VI$_h$ case is of particular interest in that it contains many different subcases which exhibit many of the different possible future asymptotic behaviours of Bianchi cosmological models.

Replacements

astro-ph/0607643 [abs, ps, pdf, other] :: Title: Bulk viscosity of spin-one color superconductors with two quark falvors
Authors: Basil A. Sa'd, Igor A. Shovkovy, Dirk H. Rischke
Comments: 10 pages, 6 figures, Discussion is extended and several references added. Version accepted for publication in Phys. Rev. D
Note: replaced with revised version Thu, 8 Mar 2007 17:56:42 GMT (368kb)
astro-ph/0610263 [abs, ps, pdf, other] :: Title: From Thin to Thick: The Impact of X-ray Irradiation on Accretion Disks in AGN
Authors: P. Chang, E. Quataert, N. Murray
Comments: 8 pages, 4 figures, accepted to ApJ. changes made from suggestion by the referee
Note: replaced with revised version Thu, 8 Mar 2007 18:42:22 GMT (48kb)
astro-ph/0611448 [abs, ps, pdf, other] :: Title: Characterization of Gravitational Microlensing Planetary Host Stars
Authors: David P. Bennett, Jay Anderson, B. Scott Gaudi
Comments: accepted for publication in ApJ, May 10, 2007
Note: replaced with revised version Thu, 8 Mar 2007 03:49:19 GMT (74kb)
astro-ph/0611590 [abs, pdf, other] :: Title: A deeper look at the colors of the Saturnian irregular satellites
Authors: T. Grav (Harvard-Smithsonian Center for Astrophysics and Institute for Astronomy, University of Hawaii), J. Bauer (Jet Propolsion Laboratory, California Institute of Technology)
Comments: 36 pages, with 11 figures and 5 tables. Revised peer-reviewed manuscript
Note: replaced with revised version Thu, 8 Mar 2007 12:39:46 GMT (219kb,D)
astro-ph/0612756 [abs, ps, pdf, other] :: Title: Galactic dynamos supported by magnetic helicity fluxes
Authors: Sharanya Sur (1), Anvar Shukurov (2), Kandaswamy Subramanian (1) ((1) IUCAA, (2) School of Mathematics and Statistics, Newcastle University)
Comments: Accepted for publication in MNRAS
Note: replaced with revised version Thu, 8 Mar 2007 05:19:53 GMT (63kb)
astro-ph/0701357 [abs, ps, pdf, other] :: Title: Imprints of a Primordial Preferred Direction on the Microwave Background
Authors: Lotty Ackerman, Sean M. Carroll, Mark B. Wise
Comments: 7 pages, no figures; v4: typo in section II corrected
Note: replaced with revised version Wed, 7 Mar 2007 23:08:20 GMT (15kb)
astro-ph/0702335 [abs, ps, pdf, other] :: Title: Stochastic Gravitational Wave Background from Light Cosmic Strings
Authors: Matthew R. DePies, Craig J. Hogan (University of Washington)
Comments: 13 pages, 7 figures, v2 references added and typos corrected
Note: replaced with revised version Thu, 8 Mar 2007 04:45:12 GMT (522kb)
astro-ph/0703107 [abs, ps, pdf, other] :: Title: SN 2006aj Associated with XRF 060218 At Late Phases: Nucleosynthesis-Signature of A Neutron Star-Driven Explosion
Authors: Keiichi Maeda, Koji Kawabata, Masaomi Tanaka, Ken'ichi Nomoto, Nozomu Tominaga, Takashi Hattori, Takeo Minezaki, Takami Kuroda, Tomoharu Suzuki, Jinsong Deng, Paolo A. Mazzali, Elena Pian
Comments: Accepted for Publication in the Astrophysical Journal Letters (2007, ApJ, 658, L5). 8 pages, including 1 table and 3 figures. Typos corrected
Note: replaced with revised version Thu, 8 Mar 2007 05:46:12 GMT (376kb)
astro-ph/0703112 [abs, pdf, other] :: Title: Discovery of a Bipolar Outflow from 2MASSW J1207334-393254, A 24 Jupiter Mass Brown Dwarf
Authors: E.T. Whelan, T.P. Ray, S. Randich, F. Baciotti, R.Jayawardhana, L.Testi, A.Natta, S.Mohanty
Comments: 12 pages, 2 figures
Note: replaced with revised version Thu, 8 Mar 2007 17:44:19 GMT (163kb,D)
astro-ph/0703115 [abs, ps, pdf, other] :: Title: The Universal Rotation Curve of Spiral Galaxies. II The Dark Matter Distribution out to the Virial Radius
Authors: P. Salucci, A. Lapi, C. Tonini, G. Gentile, I. Yegorova, U. Klein
Comments: In press on MNRAS. 10 pages, 8 figures. The Mathematica code for the figures is available at: this http URL Corrected typos
Note: replaced with revised version Thu, 8 Mar 2007 12:26:37 GMT (226kb)
astro-ph/0703156 [abs, ps, pdf, other] :: Title: Images, structural properties and metal abundances of galaxy clusters observed with Chandra ACIS-I at 0.1<z<1.3
Authors: B. J. Maughan, C. Jones, W. Forman, L. Van Speybroeck (Harvard-Smithsonian Center for Astrophysics)
Comments: 20 pages, 12 figures, emulateapj. ApJ submitted. Corrected typo in title
Note: replaced with revised version Thu, 8 Mar 2007 20:58:07 GMT (556kb)
gr-qc/0610154 [abs, ps, pdf, other] :: Title: Total recoil: the maximum kick from nonspinning black-hole binary inspiral
Authors: Jose A. Gonzalez, Ulrich Sperhake, Bernd Bruegmann, Mark Hannam, Sascha Husa
Comments: 4 pages, 4 figures. Version accepted by PRL
Note: replaced with revised version Thu, 8 Mar 2007 16:43:39 GMT (108kb)
gr-qc/0612056 [abs, ps, pdf, other] :: Title: Model-independent test of spatial variations of the Newtonian gravitational constant in some extrasolar planetary systems
Authors: Lorenzo Iorio
Comments: LaTex, 9 pages, no figures, 5 tables, 37 references. Thanks to Paolo Salucci for his important remarks on MOND. To appear in Monthly Notices of the Royal Astronomical Society
Subj-class: General Relativity and Quantum Cosmology; Space Physics
Note: replaced with revised version Thu, 8 Mar 2007 19:00:34 GMT (10kb)
hep-ph/0612018 [abs, ps, pdf, other] :: Title: Baryogenesis from Gravitational Decay of TeV-Particles in Theories with Low Scale Gravity
Authors: C. Bambi, A.D. Dolgov, K. Freese
Comments: 18 pages, added references
Note: replaced with revised version Wed, 7 Mar 2007 21:33:34 GMT (21kb)
hep-th/0611075 [abs, ps, pdf, other] :: Title: Cosmological solutions of model with $1/H^{2}$ term
Authors: Masato Ito
Comments: 10 pages, 2 figures, version to appear in JCAP
Note: replaced with revised version Thu, 8 Mar 2007 02:46:34 GMT (827kb)
hep-th/0611243 [abs, ps, pdf, other] :: Title: Constraints on string networks with junctions
Authors: E.J.Copeland, T.W.B.Kibble, D.A.Steer
Comments: 12 pages, 6 figures. Version to appear in PRD. (2 new references and slightly extended discussion in section VII)
Note: replaced with revised version Thu, 8 Mar 2007 08:08:33 GMT (809kb)
hep-th/0702184 [abs, ps, pdf, other] :: Title: Unimodular cosmology and the weight of energy
Authors: Enrique Álvarez, Antón F. Faedo
Comments: LaTeX, 23 pages, conclusions expanded
Note: replaced with revised version Thu, 8 Mar 2007 16:17:33 GMT (14kb)
hep-th/0702193 [abs, ps, pdf, other] :: Title: Lumps in the throat
Authors: Keshav Dasgupta, Hassan Firouzjahi, Rhiannon Gwyn
Comments: JHEP.cls, 31 pages, 5 .eps figures; v2: some comments and references added
Note: replaced with revised version Thu, 8 Mar 2007 19:21:56 GMT (100kb)

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