General relativity and cosmology

Noether symmetry approach in phantom quintessence cosmology

S. Capozziello, E. Piedipalumbo, C. Rubano, and P. Scudellaro
In the framework of phantom quintessence cosmology, we use the Noether Symmetry Approach to obtain general exact solutions for the cosmological equations. This result is achieved by the quintessential (phantom) potential determined by the existence of the symmetry itself. A comparison between the th ... [Phys. Rev. D 80, 104030 (2009)] published Fri Nov 20, 2009.

Lifshitz black hole in three dimensions

Eloy Ayon-Beato, Alan Garbarz, Gaston Giribet, and Mokhtar Hassaine
We show that three-dimensional massive gravity admits Lifshitz metrics with generic values of the dynamical exponent z as exact solutions. At the point z=3, exact black hole solutions that are asymptotically Lifshitz arise. These spacetimes are three-dimensional analogues of those that were recently ... [Phys. Rev. D 80, 104029 (2009)] published Fri Nov 20, 2009.

Cosmology with unparticles

Bohdan Grzadkowski and Jose Wudka
We discuss cosmological consequences of the existence of physics beyond the standard model that exhibits Banks-Zaks and unparticle behavior in the UV and IR, respectively. We first derive the equation of state for unparticles and use it to obtain the temperature dependence of the corresponding energ ... [Phys. Rev. D 80, 103518 (2009)] published Fri Nov 20, 2009.

Spin-spin interaction in the spin-precession equations

Janos Majar
One of the most active field of research in general relativity is the description of the spin properties of astrophysical objects. The main tool in the description of the gravitational waves emitted by compact binary systems in the inspiral era is the post-Newtonian (PN) approximation, where spin ef ... [Phys. Rev. D 80, 104028 (2009)] published Thu Nov 19, 2009.

CMB lensing constraints on dark energy and modified gravity scenarios

Erminia Calabrese, Asantha Cooray, Matteo Martinelli, Alessandro Melchiorri, Luca Pagano et al.
Weak gravitational lensing leaves a characteristic imprint on the cosmic microwave background temperature and polarization angular power spectra. Here, we investigate the possible constraints on the integrated lensing potential from future cosmic microwave background angular spectra measurements exp ... [Phys. Rev. D 80, 103516 (2009)] published Thu Nov 19, 2009.

Quantization of higher spin fields

J. W. Wagenaar and T. A. Rijken
In this article we quantize (massive) higher spin (1<=j<=2) fields by means of Dirac's constrained Hamilton procedure both in the situation were they are totally free and were they are coupled to (an) auxiliary field(s). A full constraint analysis and quantization is presented by determining and dis ... [Phys. Rev. D 80, 104027 (2009)] published Wed Nov 18, 2009.

Well-posedness of Einstein's equation with redshift data

Christopher J. Winfield
We study the solvability of a system of ordinary differential equations derived from null geodesics of the LemaitreTolmanBondi metric with data given in terms of a so-called redshift parameter. Data are introduced along these geodesics by the luminosity distance function. We check our results with l ... [J. Math. Phys. 50, 113515 (2009)] published Tue Nov 17, 2009.

Holes in the static Einstein universe and a model of the cosmological voids

Andrzej Odrzywolek
A spherically symmetric, static model of the cosmological voids is constructed in the framework of the Tolman-Oppenheimer-Volkov equation with the cosmological constant. Extension of the Tooper result (dimensionless form of the TOV equation) is provided for nonzero Lambda. Then, the equation is simp ... [Phys. Rev. D 80, 103515 (2009)] published Tue Nov 17, 2009.

Emergence of scalar matter from spin foam model

Peng Xu and Yongge Ma
A spin foam model of three dimensional gravity nonminimally coupled with a scalar field is studied. By discretization of the scalar field, the model is worked out precisely in a purely combinational way. It is shown that the quantum physics of the scalar matter is totally encoded into the modified d ... [Phys. Rev. D 80, 104024 (2009)] published Tue Nov 17, 2009.

Hamiltonian of a spinning test particle in curved spacetime

Enrico Barausse, Etienne Racine, and Alessandra Buonanno
Using a Legendre transformation, we compute the unconstrained Hamiltonian of a spinning test particle in a curved spacetime at linear order in the particle spin. The equations of motion of this unconstrained Hamiltonian coincide with the Mathisson-Papapetrou-Pirani equations. We then use the formali ... [Phys. Rev. D 80, 104025 (2009)] published Tue Nov 17, 2009.

Bayesian reconstruction of gravitational wave burst signals from simulations of rotating stellar core collapse and bounce

Christian Rover, Marie-Anne Bizouard, Nelson Christensen, Harald Dimmelmeier, Ik Siong Heng et al.
Presented in this paper is a technique that we propose for extracting the physical parameters of a rotating stellar core collapse from the observation of the associated gravitational wave signal from the collapse and core bounce. Data from interferometric gravitational wave detectors can be used to ... [Phys. Rev. D 80, 102004 (2009)] published Tue Nov 17, 2009.

Accretion process onto super-spinning objects

Cosimo Bambi, Katherine Freese, Tomohiro Harada, Rohta Takahashi, and Naoki Yoshida
The accretion process onto spinning objects in Kerr spacetimes is studied with numerical simulations. Our results show that accretion onto compact objects with Kerr parameter (characterizing the spin) |a|M is very different. In the superspinning case, for |a| moderately larger than M, the ... [Phys. Rev. D 80, 104023 (2009)] published Tue Nov 17, 2009.

Electromagnetic absorption cross section of Reissner-Nordstrom black holes revisited

Luis C. B. Crispino, Atsushi Higuchi, and Ednilton S. Oliveira
The absorption cross section of Reissner-Nordstrom black holes for the electromagnetic field is computed numerically for arbitrary frequencies, taking into account the coupling of the electromagnetic and gravitational perturbations. We also compute the conversion coefficients of electromagnetic to g ... [Phys. Rev. D 80, 104026 (2009)] published Tue Nov 17, 2009.

Einstein-Maxwell system in 3+1 form and initial data for multiple charged black holes

Miguel Alcubierre, Juan Carlos Degollado, and Marcelo Salgado
We consider the Einstein-Maxwell system as a Cauchy initial value problem taking the electric and magnetic fields as independent variables. Maxwell's equations in curved spacetimes are derived in detail using a 3+1 formalism and their hyperbolic properties are analyzed, showing that the resulting sy ... [Phys. Rev. D 80, 104022 (2009)] published Mon Nov 16, 2009.

Assisted dark energy

Junko Ohashi and Shinji Tsujikawa
Cosmological scaling solutions, which give rise to a scalar-field density proportional to a background fluid density during radiation and matter eras, are attractive to alleviate the energy scale problem of dark energy. In the presence of multiple scalar fields, the scaling solution can exit to the ... [Phys. Rev. D 80, 103513 (2009)] published Mon Nov 16, 2009.

Towards a supersymmetric generalization of the Schwarzschild black hole

J. C. Lopez-Dominguez, O. Obregon, and S. Zacarias
The Wheeler-DeWitt (WDW) equation for the Kantowski-Sachs model can also be understood as the WDW equation corresponding to the Schwarzschild black hole due to the well known diffeomorphism between these two metrics. The WDW equation and its solutions are ignorant of the coordinate patch one is usin ... [Phys. Rev. D 80, 104020 (2009)] published Mon Nov 16, 2009.

Constraint on coupled dark energy models from observations

Jun-Qing Xia
The coupled dark energy models, in which the quintessence scalar field nontrivially couples to the cold dark matter, have been proposed to explain the coincidence problem. In this paper we study the perturbations of coupled dark energy models and the effects of this interaction on the current observ ... [Phys. Rev. D 80, 103514 (2009)] published Mon Nov 16, 2009.

Instability of small Lovelock black holes in even dimensions

Tomohiro Takahashi and Jiro Soda
We study the stability of static black holes in Lovelock theory, which is a natural higher dimensional generalization of Einstein theory. We derive a master equation for tensor perturbations in general Lovelock theory. It turns out that the resultant equation is characterized by one functional which ... [Phys. Rev. D 80, 104021 (2009)] published Mon Nov 16, 2009.

Performance of arm locking in LISA

Kirk McKenzie, Robert E. Spero, and Daniel A. Shaddock
For the Laser Interferometer Space Antenna (LISA) to reach its design sensitivity, the coupling of the free-running laser frequency noise to the signal readout must be reduced by more than 14 orders of magnitude. One technique employed to reduce the laser frequency noise will be arm locking, where t ... [Phys. Rev. D 80, 102003 (2009)] published Mon Nov 16, 2009.

Erratum: Overspinning a Black Hole with a Test Body [Phys. Rev. Lett. 103, 141101 (2009)]

Ted Jacobson and Thomas P. Sotiriou
Abstract not available. [Phys. Rev. Lett. 103, 209903 (2009)] published Fri Nov 13, 2009.

Inflaton two-point correlation in the presence of a cosmic string

Chien-Yao Tseng and Mark B. Wise
Precise measurements of the microwave background anisotropy have confirmed the inflationary picture of approximately scale invariant, Gaussian primordial adiabatic density perturbations. However, there are some anomalies that suggest a small violation of rotational and/or translational invariance in ... [Phys. Rev. D 80, 103512 (2009)] published Fri Nov 13, 2009.

A minimal model of Lorentz gauge gravity with dynamical torsion. (arXiv:0911.3688v1 [gr-qc])

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Simple generalizations of anti-deSitter space-time. (arXiv:0911.3697v1 [gr-qc])

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On Particles Creation and Renormalization in a Cosmological Model with a Big Rip. (arXiv:0911.3737v1 [gr-qc])

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Loop quantum gravity and the CMB: toward pre-Big Bounce cosmology. (arXiv:0911.3745v1 [gr-qc])

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Thermodynamical Behaviour of Inhomogeneous Universe with Varying $\Lambda$ in Presence of Electromagnetic Field. (arXiv:0911.3759v1 [gr-qc])

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Simple Types of Anisotropic Inflation. (arXiv:0911.3805v1 [gr-qc])

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Initial Condition Model from Imaginary Part of Action and the Information Loss. (arXiv:0911.3859v1 [gr-qc])

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Radiation from low-momentum zoom-whirl orbits. (arXiv:0911.3862v1 [gr-qc])

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Understanding possible electromagnetic counterparts to loud gravitational wave events: Binary black hole effects on electromagnetic fields. (arXiv:0911.3889v1 [gr-qc])

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Cold dark matter from "strong gravity". (arXiv:0706.3050v2 [gr-qc] UPDATED)

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An extension theorem for conformal gauge singularities. (arXiv:0710.5552v3 [gr-qc] UPDATED)

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A Conformal Extension Theorem based on Null Conformal Geodesics. (arXiv:0803.1650v2 [gr-qc] UPDATED)

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