Date: Thu, 30 Sep 10 00:06:50 GMT Subject: gr-qc daily 4 new + 4 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: gr-qc@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 28 Sep 10 20:00:00 GMT to Wed 29 Sep 10 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1009.5831 Date: Wed, 29 Sep 2010 10:10:54 GMT (12kb) Title: Waves in General Relativistic Two-fluid Plasma around a Schwarzschild Black Hole Authors: M. Atiqur Rahman Categories: gr-qc Comments: 7 pages. Revised Submitted to Princeton Plasma Physics \\ Waves propagating in the relativistic electron-positron or ions plasma are investigated in a frame of two-fluid equations using the 3+1 formalism of general relativity developed by Thorne, Price and Macdonald (TPM). The plasma is assumed to be freefalling in the radial direction toward the event horizon due to the strong gravitational field of a Schwarzschild black hole. The local dispersion relations for transverse and longitudinal waves have been derived, in analogy with the special relativistic formulation as explained in an earlier paper, to take account of relativistic effects due to the event horizon using WKB approximation \\ ( http://arxiv.org/abs/1009.5831 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5882 Date: Wed, 29 Sep 2010 13:51:29 GMT (294kb) Title: On the relevance of gravitational self-force corrections on parameter estimation errors for extreme-mass-ratio inspirals Authors: E. A. Huerta and Jonathan R Gair Categories: gr-qc Comments: 6 pages, 1 figure, submitted to proceedings of the 8th International LISA Symposium, Stanford, June 28 - July 2, 2010 ACM-class: J.2 \\ It is not currently clear how important it will be to include conservative self-force (SF) corrections in the models for extreme-mass-ratio inspiral (EMRI) waveforms that will be used to detect such signals in LISA (Laser Interferometer Space Antenna) data. These proceedings will address this issue for circular-equatorial inspirals using an approximate EMRI model that includes conservative corrections at leading post-Newtonian order. We will present estimates of the magnitude of the parameter estimation errors that would result from omitting conservative corrections, and compare these to the errors that will arise from noise fluctuations in the detector. We will also use this model to explore the relative importance of the second-order radiative piece of the SF, which is not presently known. \\ ( http://arxiv.org/abs/1009.5882 , 294kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5953 Date: Wed, 29 Sep 2010 17:34:43 GMT (23kb) Title: An effective approach to the problem of time Authors: Martin Bojowald, Philipp A Hoehn, Artur Tsobanjan Categories: gr-qc hep-th Comments: 19 pages Report-no: IGC-10/9-2, ITP-UU-10/35, SPIN-10/30 \\ A practical way to deal with the problem of time in quantum cosmology and quantum gravity is proposed. The main tool is effective equations, which mainly restrict explicit considerations to semiclassical regimes but have the crucial advantage of allowing the consistent use of local internal times in non-deparameterizable systems. Different local internal times are related merely by gauge transformations, thereby enabling relational evolution through turning points of non-global internal times. The main consequence of the local nature of internal time is the necessity of its complex-valuedness, reminiscent of but more general than non-unitarity of evolution defined for finite ranges of time. By several general arguments, the consistency of this setting is demonstrated. Finally, we attempt an outlook on the nature of time in highly quantum regimes. The focus of this note is on conceptual issues. \\ ( http://arxiv.org/abs/1009.5953 , 23kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5971 Date: Wed, 29 Sep 2010 18:42:57 GMT (150kb) Title: Distorted 5-dimensional vacuum black hole Authors: Shohreh Abdolrahimi, Andrey A. Shoom, and Don N. Page Categories: gr-qc Comments: 20 pages, 9 figures Report-no: Alberta-Thy-12-10 \\ In this paper we study how the distortion generated by a static and neutral distribution of external matter affects a 5-dimensional Schwarzschild-Tangherlini black hole. A solution representing a particular class of such distorted black holes admits an RxU(1)xU(1) isometry group. We show that there exists a certain duality transformation between the black hole horizon and a stretched singularity surfaces. The space-time near the distorted black hole singularity has the same topology and Kasner exponents as those of a 5-dimensional Schwarzschild-Tangherlini black hole. We calculate the maximal proper time of free fall of a test particle from the distorted black hole horizon to its singularity and find that, depending on the distortion, it can be less, equal to, or greater than that of a Schwarzschild-Tangherlini black hole of the same horizon area. This implies that due to the distortion, the singularity of a Schwarzschild-Tangherlini black hole can come close to its horizon. A relation between the Kretschmann scalar calculated on the horizon of a 5-dimensional static, asymmetric, distorted black hole and the trace of the square of the Ricci tensor of the horizon surface is derived. \\ ( http://arxiv.org/abs/1009.5971 , 150kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1009.5678 (*cross-listing*) Date: Tue, 28 Sep 2010 20:02:09 GMT (1097kb) Title: Holography of a Composite Inflaton Authors: Nick Evans, James French, and Keun-Young Kim Categories: hep-th gr-qc Comments: 13 pages, 12 figures \\ We study the time evolution of a brane construction that is holographically dual to a strongly coupled gauge theory that dynamically breaks a global symmetry through the generation of an effective composite Higgs vev. The D3/D7 system with a background magnetic field or non-trivial gauge coupling (dilaton) profile displays the symmetry breaking. We study motion of the D7 brane in the background of the D3 branes. For small field inflation in the field theory the effective Higgs vev rolls from zero to the true vacuum value. We study what phenomenological dilaton profile generates the slow rolling needed, hence learning how the strongly coupled gauge theory's coupling must run. We note that evolution of our configuration in the holographic direction, representing the phyiscs of the strong interactions, can provide additional slowing of the roll time. Inflation seems to be favoured if the coupling changes by only a small amount or very gently. We speculate on how such a scenario could be realized away from N=4 gauge theory, for example, in a walking gauge theory. \\ ( http://arxiv.org/abs/1009.5678 , 1097kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5763 (*cross-listing*) Date: Wed, 29 Sep 2010 03:40:42 GMT (28kb) Title: Conserved charges for black holes in Einstein-Gauss-Bonnet gravity coupled to nonlinear electrodynamics in AdS space Authors: Olivera Miskovic and Rodrigo Olea Categories: hep-th gr-qc Comments: 30 pages, no figures \\ Motivated by possible applications within the framework of anti-de Sitter gravity/Conformal Field Theory (AdS/CFT) correspondence, charged black holes with AdS asymptotics, which are solutions to Einstein-Gauss-Bonnet gravity in D dimensions, and whose electric field is described by a nonlinear electrodynamics (NED) are studied. For a topological static black hole ansatz, the field equations are exactly solved in terms of the electromagnetic stress tensor for an arbitrary NED Lagrangian, in any dimension D and for arbitrary positive values of Gauss-Bonnet coupling. In particular, this procedure reproduces the black hole metric in Born-Infeld and conformally invariant electrodynamics previously found in the literature. Altogether, it extends to D>4 the four-dimensional solution obtained by Soleng in logarithmic electrodynamics, which comes from vacuum polarization effects. Fall-off conditions for the electromagnetic field that ensure the finiteness of the electric charge are also discussed. The black hole mass and vacuum energy as conserved quantities associated to an asymptotic timelike Killing vector are computed using a background-independent regularization of the gravitational action based on the addition of counterterms which are a given polynomial in the intrinsic and extrinsic curvatures. \\ ( http://arxiv.org/abs/1009.5763 , 28kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5825 (*cross-listing*) Date: Wed, 29 Sep 2010 09:59:31 GMT (113kb,D) Title: Multipole analysis in cosmic topology Authors: Peter Kramer Categories: astro-ph.CO gr-qc math-ph math.MP Comments: 15 pages, with figures \\ Low multipole amplitudes in the Cosmic Microwave Background CMB radiation can be explained by selection rules from the underlying multiply-connected homotopy. We apply a multipole analysis to the harmonic bases and introduce point symmetry.We give explicit results for two cubic 3-spherical manifolds and lowest polynomial degrees, and derive three new spherical 3-manifolds. \\ ( http://arxiv.org/abs/1009.5825 , 113kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5910 (*cross-listing*) Date: Wed, 29 Sep 2010 15:23:08 GMT (117kb) Title: Holographic Dark Energy with Curvature Authors: Victor H. Cardenas and Roberto G. Perez Categories: astro-ph.CO gr-qc Comments: 6 pages, 2 figures \\ In this paper we consider an holographic model of dark energy, where the length scale is the Hubble radius, in a non flat geometry. The model contains the possibility to alleviate the cosmic coincidence problem, and also incorporate a mechanism to obtain the transition from decelerated to an accelerated expansion regime. We derive an analytic form for the Hubble parameter in a non flat universe, and using it, we perform a Bayesian analysis of this model using SNIa, BAO and CMB data. We find from this analysis that the data favored a small value for $\Omega_k$, however high enough to still produce cosmological consequences. \\ ( http://arxiv.org/abs/1009.5910 , 117kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:0911.3432 replaced with revised version Wed, 29 Sep 2010 15:51:37 GMT (22kb) Title: A Path-integral for the Master Constraint of Loop Quantum Gravity Authors: Muxin Han Categories: gr-qc hep-th Comments: 19 pages Journal-ref: Class. Quantum Grav. 27 (2010) 215009 \\ ( http://arxiv.org/abs/0911.3432 , 22kb) ------------------------------------------------------------------------------ \\ arXiv:1003.4773 replaced with revised version Tue, 28 Sep 2010 20:19:03 GMT (20kb) Title: A new cubic theory of gravity in five dimensions: Black hole, Birkhoff's theorem and C-function Authors: Julio Oliva and Sourya Ray Categories: gr-qc hep-th Comments: 21 pages, no figures, V2: two appendices and some references added, V3: New section on the generalization to arbitrary higher order. Analogy with BHT new massive gravity Lagrangian made more precise, V4: Typos corrected. To appear in CQG Report-no: CECS-PHY-10/03 \\ ( http://arxiv.org/abs/1003.4773 , 20kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4189 replaced with revised version Wed, 29 Sep 2010 18:46:37 GMT (333kb,D) Title: The Carter Constant for Inclined Orbits About a Massive Kerr Black Hole: I. circular orbits Authors: P. G. Komorowski, S. R. Valluri, M. Houde Categories: gr-qc Comments: 42 pages, 8 figures, accepted by Classical and Quantum Gravity on September 22nd, 2010 \\ ( http://arxiv.org/abs/1007.4189 , 333kb) ------------------------------------------------------------------------------ \\ arXiv:1009.3326 (*cross-listing*) replaced with revised version Wed, 29 Sep 2010 17:02:13 GMT (725kb) Title: Scale dependence of $f_{NL}$ in N-flation Authors: Qing-Guo Huang Categories: astro-ph.CO gr-qc hep-ph hep-th Comments: 15 pages, 2 figures; a subsection with detectable scale dependence of f_NL added \\ ( http://arxiv.org/abs/1009.3326 , 725kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arXiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arXiv.org/help/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. 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