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Brane-f(R) gravity and dark matter (2012)

A. S. Sefiedgar, Z. Haghani, and H. R. Sepangi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-09

Description: Author(s): A. S. Sefiedgar, Z. Haghani, and H. R. Sepangi The collision-free Boltzmann equation is used in the context of brane- f ( R ) gravity to derive the virial theorem. It is shown that the virial mass is proportional to certain geometrical terms appearing in the Einstein field equations and contributes to gravitational energy and that such a geometric m... [Phys. Rev. D 85, 064012] Published Thu Mar 08, 2012

Keywords: General relativity, gravitation

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Scalar-tensor cosmologies with dust matter in the general relativity limit (2012)

Laur Järv, Piret Kuusk, and Margus Saal

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-09

Description: Author(s): Laur Järv, Piret Kuusk, and Margus Saal We consider flat Friedmann-Lemaître-Robertson-Walker cosmological models in the framework of general scalar-tensor theories of gravity with arbitrary coupling functions, set in the Jordan frame, in the cosmological epoch when the energy density of the ordinary dust matter dominates over the energy d... [Phys. Rev. D 85, 064013] Published Thu Mar 08, 2012

Keywords: General relativity, gravitation

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Finsler geometric extension of Einstein gravity (2012)

Christian Pfeifer and Mattias N. R. Wohlfarth

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-09

Description: Author(s): Christian Pfeifer and Mattias N. R. Wohlfarth We construct gravitational dynamics for Finsler spacetimes in terms of an action integral on the unit tangent bundle. These spacetimes are generalizations of Lorentzian metric manifolds which satisfy necessary causality properties. A coupling procedure for matter fields to Finsler gravity completes ... [Phys. Rev. D 85, 064009] Published Thu Mar 08, 2012

Keywords: General relativity, gravitation

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BF gravity with Immirzi parameter and matter fields (2012)

Merced Montesinos and Mercedes Velázquez

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-09

Description: Author(s): Merced Montesinos and Mercedes Velázquez We perform the coupling of the scalar, Maxwell, and Yang-Mills fields as well as the cosmological constant to BF gravity with Immirzi parameter. The proposed action principles employ auxiliary fields in order to keep a polynomial dependence on the B fields. By handling the equations of motion for th... [Phys. Rev. D 85, 064011] Published Thu Mar 08, 2012

Keywords: General relativity, gravitation

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Classical Lagrangians for momentum dependent Lorentz violation (2012)

Don Colladay and Patrick McDonald

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-22

Description: Author(s): Don Colladay and Patrick McDonald Certain momentum-dependent terms in the fermion sector of the Lorentz-violating standard model extension (SME) yield solvable classical Lagrangians of a type not mentioned in the literature. These cases yield new relatively simple examples of Finsler and pseudo-Finsler structures. One of the cases i... [Phys. Rev. D 85, 044042] Published Tue Feb 21, 2012

Keywords: General relativity, gravitation

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Relativity accommodates superluminal mean velocities (2012)

B. Allés

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-22

Description: Author(s): B. Allés Contrary to a widespread belief, measures of velocity can yield a value larger than c , the instantaneous light speed in vacuum, without contradicting Einstein’s relativity. Nevertheless, the effect turns out to be too small to explain the recently claimed superluminal velocity by the OPERA Collabora... [Phys. Rev. D 85, 047501] Published Tue Feb 21, 2012

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Group field theory and simplicial gravity path integrals: A model for Holst-Plebanski gravity (2012)

Aristide Baratin and Daniele Oriti

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-04

Description: Author(s): Aristide Baratin and Daniele Oriti In a recent work, a dual formulation of group field theories as noncommutative quantum field theories has been proposed, providing an exact duality between spin foam models and noncommutative simplicial path integrals for constrained BF theories. In light of this new framework, we define a model for... [Phys. Rev. D 85, 044003] Published Fri Feb 03, 2012

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Domain wall solution in F(R) gravity and variation of the fine structure constant (2012)

Kazuharu Bamba, Shin’ichi Nojiri, and Sergei D. Odintsov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Kazuharu Bamba, Shin’ichi Nojiri, and Sergei D. Odintsov We construct a domain wall solution in F ( R ) gravity. We reconstruct a static domain wall solution in a scalar field theory. We also reconstruct an explicit F ( R ) gravity model in which a static domain wall solution can be realized. Moreover, we show that there could exist an effective (gravitational)... [Phys. Rev. D 85, 044012] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Superconducting hair on charged black string background (2012)

Lukasz Nakonieczny and Marek Rogatko

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Lukasz Nakonieczny and Marek Rogatko Behavior of Dirac fermions in the background of a charged black string penetrated by an Abelian Higgs vortex is elaborated. One finds evidence that the system under consideration can support fermion fields acting like a superconducting cosmic string in the sense that a nontrivial Dirac fermion fiel... [Phys. Rev. D 85, 044013] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Contrasting features of anisotropic loop quantum cosmologies: The role of spatial curvature (2012)

Brajesh Gupt and Parampreet Singh

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Brajesh Gupt and Parampreet Singh A characteristic feature of loop quantization of the isotropic and Bianchi-I spacetimes is the existence of universal bounds on the energy density and the expansion and shear scalars, independent of the matter content. We investigate the properties of these physical quantities in Bianchi-II and Bian... [Phys. Rev. D 85, 044011] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Hamiltonian analysis of 1+1-dimensional massive gravity (2012)

J. Klusoň

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): J. Klusoň We perform the Hamiltonian analysis of 1+1 -dimensional nonlinear massive gravity studied in [C. de Rham, G. Gabadadze, and A. Tolley, arXiv:1107.3820]. We find the constraint structure of the given theory and perform the counting of the physical degrees of freedom. [Phys. Rev. D 85, 044010] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Weak gravitational lensing in fourth order gravity (2012)

A. Stabile and An. Stabile

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): A. Stabile and An. Stabile For a general class of analytic functions f ( R , R α β R α β , R α β γ δ R α β γ δ ) we discuss the gravitational lensing in the Newtonian limit of theory. From the properties of the Gauss-Bonnet invariant it is enough to consider only one curvature invariant between the Ricci tensor and the Riemann tensor. Then, we an... [Phys. Rev. D 85, 044014] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Observational cosmology using characteristic numerical relativity: Characteristic formalism on null geodesics (2012)

P. J. van der Walt and N. T. Bishop

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): P. J. van der Walt and N. T. Bishop The characteristic formalism of numerical relativity is based on a system of coordinates aligned with outgoing null cones. While these coordinates were designed for studying gravitational waves, they can also be easily adapted to model cosmological past null cones (PNCs). Similar to observational co... [Phys. Rev. D 85, 044016] Published Tue Feb 07, 2012

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Black hole-neutron star mergers for 10 M_{⊙} black holes (2012)

Francois Foucart, Matthew D. Duez, Lawrence E. Kidder, Mark A. Scheel, Bela Szilagyi, and Saul A. Teukolsky

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Francois Foucart, Matthew D. Duez, Lawrence E. Kidder, Mark A. Scheel, Bela Szilagyi, and Saul A. Teukolsky General relativistic simulations of black hole-neutron star mergers have currently been limited to low-mass black holes ( M BH ≤7 M ⊙ ), even though population synthesis models indicate that a majority of mergers might involve more massive black holes ( M BH ≥10 M ⊙ ). We present the first general relativis... [Phys. Rev. D 85, 044015] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Apparent horizons with nontrivial topology and the hyperhoop conjecture in six-dimensional space-times (2012)

Tomohiro Kurata, Hirotaka Nakayama, and Takahiro Okamoto

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Tomohiro Kurata, Hirotaka Nakayama, and Takahiro Okamoto We investigate the validity of the hyperhoop conjecture, which claims to determine a necessary and sufficient condition for the formation of black hole horizons in higher-dimensional space-times. Here we consider momentarily static, conformally flat initial data sets, each describing a gravitational... [Phys. Rev. D 85, 044017] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Conformal gravity with the most general ELKO matter (2012)

Luca Fabbri

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-22

Description: Author(s): Luca Fabbri Recently we have constructed the conformal gravity with metric and torsion, finding the gravitational field equations that give the conservation laws and trace condition; in the present paper we apply this theory to the case of ELKO matter field, proving that their spin and energy densities once the... [Phys. Rev. D 85, 047502] Published Tue Feb 21, 2012

Keywords: General relativity, gravitation

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Dynamics of Dirac-Born-Infeld dark energy interacting with dark matter (2012)

Chakkrit Kaeonikhom, Douglas Singleton, Sergey V. Sushkov, and N. Yongram

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-28

Description: Author(s): Chakkrit Kaeonikhom, Douglas Singleton, Sergey V. Sushkov, and N. Yongram We study the dynamics of Dirac-Born-Infeld (DBI) dark energy interacting with dark matter. The DBI dark energy model considered here has a scalar field with a nonstandard kinetic energy term, and has potential and brane tension that are power-law functions. The new feature considered here is an inte... [Phys. Rev. D 86, 124049] Published Thu Dec 27, 2012

Keywords: General relativity, gravitation

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Gravitational wave background from rotating neutron stars (2012)

Pablo A. Rosado

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-03

Description: Author(s): Pablo A. Rosado The background of gravitational waves produced by the ensemble of rotating neutron stars (which includes pulsars, magnetars, and gravitars) is investigated. A formula for Ω ( f ) (a function that is commonly used to quantify the background, and is directly related to its energy density) is derived, wit... [Phys. Rev. D 86, 104007] Published Fri Nov 02, 2012

Keywords: General relativity, gravitation

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Charged cylindrical black holes in conformal gravity (2012)

Jackson Levi Said, Joseph Sultana, and Kristian Zarb Adami

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-03

Description: Author(s): Jackson Levi Said, Joseph Sultana, and Kristian Zarb Adami Considering cylindrical topology, we present the static solution for a charged black hole in conformal gravity. We show that unlike the general relativistic case, there are two different solutions, both including a factor which gives rise to a linear term in the potential, which also features in the... [Phys. Rev. D 86, 104009] Published Fri Nov 02, 2012

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Exact self-accelerating cosmologies in the ghost-free massive gravity: The detailed derivation (2012)

Mikhail S. Volkov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Mikhail S. Volkov We present the detailed derivation of the recently announced most general cosmological solution with homogeneous and isotropic metric in the ghost-free massive gravity theory. We use the standard parametrization of the theory in terms of the matrix square root, and then show how the same results are... [Phys. Rev. D 86, 104022] Published Wed Nov 07, 2012

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Particle creation due to tachyonic instability in relativistic stars (2012)

A. G. S. Landulfo, W. C. C. Lima, G. E. A. Matsas, and D. A. T. Vanzella

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): A. G. S. Landulfo, W. C. C. Lima, G. E. A. Matsas, and D. A. T. Vanzella Dense enough compact objects were recently shown to lead to an exponentially fast increase of the vacuum energy density for some free scalar fields properly coupled to the spacetime curvature as a consequence of a tachyonic-like instability. Once the effect is triggered, the star energy density woul... [Phys. Rev. D 86, 104025] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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Stationary scalar clouds around rotating black holes (2012)

Shahar Hod

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Shahar Hod Motivated by novel results in the theory of wave dynamics in black-hole spacetimes, we analyze the dynamics of a massive scalar field surrounding a rapidly rotating Kerr black hole. In particular, we report on the existence of stationary ( infinitely long-lived) regular field configurations in the ba... [Phys. Rev. D 86, 104026] Published Wed Nov 07, 2012

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Solar system tests and interpretation of gauge field and Newtonian prepotential in general covariant Hořava-Lifshitz gravity (2012)

Kai Lin, Shinji Mukohyama, and Anzhong Wang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Kai Lin, Shinji Mukohyama, and Anzhong Wang In this paper, we first study spherically symmetric, stationary vacuum configurations in general covariant theory [ U (1) extension] of Hořava-Lifshitz gravity with the projectability condition and an arbitrary value of the coupling constant λ . We obtain all the solutions with the assumed symmetry in ... [Phys. Rev. D 86, 104024] Published Wed Nov 07, 2012

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High-order expansions of the Detweiler-Whiting singular field in Schwarzschild spacetime (2012)

Anna Heffernan, Adrian Ottewill, and Barry Wardell

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Anna Heffernan, Adrian Ottewill, and Barry Wardell The self-field of a charged particle has a singular component which diverges at the particle. We use both coordinate and covariant approaches to compute an expansion of this singular field for particles in generic geodesic orbits about a Schwarzschild black hole for scalar, electromagnetic and gravi... [Phys. Rev. D 86, 104023] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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Stationary closed strings in five-dimensional flat spacetime (2012)

Takahisa Igata, Hideki Ishihara, and Keisuke Nishiwaki

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Takahisa Igata, Hideki Ishihara, and Keisuke Nishiwaki We investigate stationary rotating closed Nambu-Goto strings in five-dimensional flat spacetime. The stationary string is defined as a world sheet that is tangent to a timelike Killing vector. The Nambu-Goto equation of motion for the stationary string is reduced to the geodesic equation on the orbi... [Phys. Rev. D 86, 104020] Published Wed Nov 07, 2012

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Anomaly and the self-energy of electric charges (2012)

Valeri P. Frolov and Andrei Zelnikov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Valeri P. Frolov and Andrei Zelnikov We study the self-energy of a charged particle located in a static D-dimensional gravitational field. We show that the energy functional for this problem is invariant under an infinite dimensional (gauge) group of transformations parametrized by one scalar function of ( D -1)—variables. We demonstrate... [Phys. Rev. D 86, 104021] Published Wed Nov 07, 2012

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Visualizing spacetime curvature via frame-drag vortexes and tidal tendexes. III. Quasinormal pulsations of Schwarzschild and Kerr black holes (2012)

David A. Nichols, Aaron Zimmerman, Yanbei Chen, Geoffrey Lovelace, Keith D. Matthews, Robert Owen, Fan Zhang, and Kip S. Thorne

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-13

Description: Author(s): David A. Nichols, Aaron Zimmerman, Yanbei Chen, Geoffrey Lovelace, Keith D. Matthews, Robert Owen, Fan Zhang, and Kip S. Thorne In recent papers, we and colleagues have introduced a way to visualize the full vacuum Riemann curvature tensor using frame-drag vortex lines and their vorticities, and tidal tendex lines and their tendicities. We have also introduced the concepts of horizon vortexes and tendexes and three-dimension... [Phys. Rev. D 86, 104028] Published Mon Nov 12, 2012

Keywords: General relativity, gravitation

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Covariant Galileon and a consistent self-accelerating universe (2012)

Cristiano Germani

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-15

Description: Author(s): Cristiano Germani In this paper we show that the flat-space Galilean theories with up to three scalars in the equation of motion (the quartic Galileons) are recovered in the decoupling limit of certain scalar theories nonminimally coupled to gravity, the so-called “Slotheonic” theories. These theories are also invari... [Phys. Rev. D 86, 104032] Published Wed Nov 14, 2012

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Brane induced gravity: From a no-go to a no-ghost theorem (2012)

Felix Berkhahn, Stefan Hofmann, and Florian Niedermann

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-08

Description: Author(s): Felix Berkhahn, Stefan Hofmann, and Florian Niedermann Numerous claims in the literature suggest that gravity induced on a higher codimensional surface violates unitarity in the weak coupling regime. However, it remained unclear, why a conserved source localized on this surface and giving rise to an induced gravity term at low energies would absorb and ... [Phys. Rev. D 86, 124022] Published Fri Dec 07, 2012

Keywords: General relativity, gravitation

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Twistorial structure of loop-gravity transition amplitudes (2012)

Simone Speziale and Wolfgang M. Wieland

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-08

Description: Author(s): Simone Speziale and Wolfgang M. Wieland The spin foam formalism provides transition amplitudes for loop quantum gravity. Important aspects of the dynamics are understood, but many pressing questions remain. In this paper we address some of them using a twistorial description, which sheds new light on both classical and quantum aspects of ... [Phys. Rev. D 86, 124023] Published Fri Dec 07, 2012

Keywords: General relativity, gravitation

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Chameleon Brans-Dicke cosmology (2012)

Yousef Bisabr

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-11

Description: Author(s): Yousef Bisabr We consider a generalized Brans-Dicke model in which the scalar field has a potential function and is also allowed to couple nonminimally with the matter sector. We assume a power-law form for the potential and the coupling functions as the inputs of the model and show that acceleration of the Unive... [Phys. Rev. D 86, 127503] Published Mon Dec 10, 2012

Keywords: General relativity, gravitation

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Warped conformal field theory (2012)

Stéphane Detournay, Thomas Hartman, and Diego M. Hofman

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-07

Description: Author(s): Stéphane Detournay, Thomas Hartman, and Diego M. Hofman We study field theories in two spacetime dimensions invariant under a chiral scaling symmetry that acts only on right-movers. The local symmetries include one copy of the Virasoro algebra and a U(1) current algebra. This differs from the two-dimensional conformal group but in some respects is equall... [Phys. Rev. D 86, 124018] Published Thu Dec 06, 2012

Keywords: General relativity, gravitation

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Lorentz violation, gravitomagnetism, and intrinsic spin (2012)

Jay D. Tasson

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-08

Description: Author(s): Jay D. Tasson A largely unconstrained set of relativity-violating effects is studied via the gravitomagnetic effect on intrinsic spins. The results of existing comagnetometer experiments are used to place constraints on two new combinations of these effects at the 10% level. We show that planned improvements in t... [Phys. Rev. D 86, 124021] Published Fri Dec 07, 2012

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Gordon metric revisited (2012)

M. Novello and E. Bittencourt

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-08

Description: Author(s): M. Novello and E. Bittencourt We show that the Gordon metric belongs to a larger class of geometries, which are responsible to describe the paths of accelerated bodies in moving dielectrics as geodesics in a metric q ̂ μ ν different from the background one. This map depends only on the background metric and on the motion of the bod... [Phys. Rev. D 86, 124024] Published Fri Dec 07, 2012

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Nonlinear (loop) quantum cosmology (2012)

Martin Bojowald, Alexander L. Chinchilli, David Simpson, Christine C. Dantas, and Matthew Jaffe

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-14

Description: Author(s): Martin Bojowald, Alexander L. Chinchilli, David Simpson, Christine C. Dantas, and Matthew Jaffe Inhomogeneous quantum cosmology is modeled as a dynamical system of discrete patches, whose interacting many-body equations can be mapped to a nonlinear minisuperspace equation by methods analogous to Bose—Einstein condensation. Complicated gravitational dynamics can therefore be described by more-m... [Phys. Rev. D 86, 124027] Published Thu Dec 13, 2012

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Hamiltonian analysis of the conformal decomposition of the gravitational field (2012)

J. Klusoň

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): J. Klusoň This short paper is devoted to the Hamiltonian formulation of the conformal decomposition of the gravitational field that was performed in [gr-qc/0501092]. We also analyze the gauge fixed form of the theory when we fix the conformal symmetry by imposing the condition √ g =1. [Phys. Rev. D 86, 084001] Published Mon Oct 01, 2012

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Spectral approach to the relativistic inverse stellar structure problem (2012)

Lee Lindblom and Nathaniel M. Indik

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): Lee Lindblom and Nathaniel M. Indik A new method for solving the relativistic inverse stellar structure problem is presented. This method determines a spectral representation of the unknown high-density portion of the stellar equation of state from a knowledge of the total masses M and radii R of the stars. Spectral representations of... [Phys. Rev. D 86, 084003] Published Mon Oct 01, 2012

Keywords: General relativity, gravitation

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Proof of ghost freedom in de Rham-Gabadadze-Tolley massive gravity (2012)

Mehrdad Mirbabayi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): Mehrdad Mirbabayi We identify different helicity degrees of freedom of Fierz-Paulian massive gravity around generic backgrounds. We show that the two-parameter family proposed by de Rham, Gabadadze, and Tolley always propagates five degrees of freedom and therefore is free from the Boulware-Deser ghost. The analysis ... [Phys. Rev. D 86, 084006] Published Mon Oct 01, 2012

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Conformal Weyl gravity and perihelion precession (2012)

Joseph Sultana, Demosthenes Kazanas, and Jackson Levi Said

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): Joseph Sultana, Demosthenes Kazanas, and Jackson Levi Said We investigate the perihelion shift of planetary motion in conformal Weyl gravity using the metric of the static, spherically symmetric solution discovered by Mannheim and Kazanas [ Astrophys. J. 342 635 (1989)]. To this end we employ a procedure similar to that used by Weinberg for the Schwarzschi... [Phys. Rev. D 86, 084008] Published Tue Oct 02, 2012

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Angular tension of black holes (2012)

David Kastor and Jennie Traschen

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): David Kastor and Jennie Traschen Angular tension is an Arnowitt-Deser-Misner charge that contributes a work term to the first law of black hole mechanics when the range of an angular coordinate is varied and leads to a new Smarr formula for stationary black holes. A phase diagram for singly spinning D =5 black holes shows that angul... [Phys. Rev. D 86, 081501] Published Tue Oct 02, 2012

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Weyl-Weyl correlator in de Donder gauge on de Sitter space (2012)

P. J. Mora, N. C. Tsamis, and R. P. Woodard

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): P. J. Mora, N. C. Tsamis, and R. P. Woodard We compute the linearized Weyl-Weyl correlator using a new solution for the graviton propagator on de Sitter background in de Donder gauge. The result agrees exactly with a previous computation in a noncovariant gauge. We also use dimensional regularization to compute the one-loop expectation value ... [Phys. Rev. D 86, 084016] Published Tue Oct 02, 2012

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Detecting binary neutron star systems with spin in advanced gravitational-wave detectors (2012)

Duncan A. Brown, Ian Harry, Andrew Lundgren, and Alexander H. Nitz

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): Duncan A. Brown, Ian Harry, Andrew Lundgren, and Alexander H. Nitz The detection of gravitational waves from binary neutron stars is a major goal of the gravitational-wave observatories Advanced LIGO and Advanced Virgo. Previous searches for binary neutron stars with LIGO and Virgo neglected the component stars’ angular momentum (spin). We demonstrate that neglecti... [Phys. Rev. D 86, 084017] Published Tue Oct 02, 2012

Keywords: General relativity, gravitation

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Universe driven by a perfect fluid in Eddington-inspired Born-Infeld gravity (2012)

Inyong Cho, Hyeong-Chan Kim, and Taeyoon Moon

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): Inyong Cho, Hyeong-Chan Kim, and Taeyoon Moon We investigate the evolution of the Universe filled with barotropic perfect fluid in Eddington-inspired Born-Infeld gravity. We consider both the isotropic and the anisotropic universe. At the early stage when the energy density is high, the evolution is modified considerably compared with that in g... [Phys. Rev. D 86, 084018] Published Tue Oct 02, 2012

Keywords: General relativity, gravitation

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Tolman’s law in linear irreversible thermodynamics: A kinetic theory approach (2012)

A. Sandoval-Villalbazo, A. L. Garcia-Perciante, and D. Brun-Battistini

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): A. Sandoval-Villalbazo, A. L. Garcia-Perciante, and D. Brun-Battistini In this paper it is shown that Tolman’s law can be derived from relativistic kinetic theory applied to a simple fluid in a BGK-like approximation. Using this framework, it becomes clear that the contribution of the gravitational field can be viewed as a cross effect that resembles the so-called Thom... [Phys. Rev. D 86, 084015] Published Tue Oct 02, 2012

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Motion of charged particles and quasinormal modes around the magnetically and tidally deformed black hole (2012)

R. A. Konoplya and Yu-Chun Liu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): R. A. Konoplya and Yu-Chun Liu Here we consider two phenomena in the vicinity of a black hole deformed by the tidal gravitational force of surrounding matter and by a strong magnetic field: equatorial motion of charged particles and the decay of a test scalar field. We were able to analyze both phenomena with analytical and simpl... [Phys. Rev. D 86, 084007] Published Tue Oct 02, 2012

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Wheeler-DeWitt equation in 2+1 dimensions (2012)

Herbert W. Hamber, Reiko Toriumi, and Ruth M. Williams

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): Herbert W. Hamber, Reiko Toriumi, and Ruth M. Williams The infrared structure of quantum gravity is explored by solving a lattice version of the Wheeler-DeWitt equations. In the present paper only the case of 2+1 dimensions is considered. The nature of the wave function solutions is such that a finite correlation length emerges and naturally cuts off an... [Phys. Rev. D 86, 084010] Published Tue Oct 02, 2012

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Constraint equations in Einstein-aether theories and the weak gravitational field limit (2012)

David Garfinkle, James Isenberg, and Jose M. Martin-Garcia

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): David Garfinkle, James Isenberg, and Jose M. Martin-Garcia We discuss the set of constraints for Einstein-aether theories, comparing the flat background case with what is expected when the gravitational fields are dynamic. We note potential pathologies occurring in the weak gravitational field limit for some of the Einstein-aether theories. [Phys. Rev. D 86, 084009] Published Tue Oct 02, 2012

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Comment on “Static and spherically symmetric black holes in f(R) theories” (2012)

S. Habib Mazharimousavi and M. Halilsoy

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): S. Habib Mazharimousavi and M. Halilsoy We consider the interesting “near-horizon test” reported in S. E. P. Bergliaffa and Y. E. C. de O. Nunes Phys. Rev. D 84 084006 (2011) for any static, spherically symmetric black hole solution admitted in f(R) gravity. Before adopting the necessary conditions for the test, however, revisions are n... [Phys. Rev. D 86, 088501] Published Tue Oct 02, 2012

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Simulations of unequal-mass black hole binaries with spectral methods (2012)

Luisa T. Buchman, Harald P. Pfeiffer, Mark A. Scheel, and Béla Szilágyi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-13

Description: Author(s): Luisa T. Buchman, Harald P. Pfeiffer, Mark A. Scheel, and Béla Szilágyi This paper presents techniques and results for simulations of unequal-mass, nonspinning binary black holes with pseudospectral methods. Specifically, we develop an efficient root-finding procedure to ensure the black hole initial data have the desired masses and spins; we extend the dual coordinate ... [Phys. Rev. D 86, 084033] Published Fri Oct 12, 2012

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Self-accelerating solutions in massive gravity on an isotropic reference metric (2012)

Hayato Motohashi and Teruaki Suyama

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-09

Description: Author(s): Hayato Motohashi and Teruaki Suyama Within the framework of the recently proposed ghost-free massive gravity, a cosmological constant-type self-accelerating solution has been obtained for Minkowski and de Sitter reference metrics. We ease the assumption on the reference metric and find the self-accelerating solution for the reference ... [Phys. Rev. D 86, 081502] Published Mon Oct 08, 2012

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Testing general relativity with LISA including spin precession and higher harmonics in the waveform (2012)

Cédric Huwyler, Antoine Klein, and Philippe Jetzer

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-10

Description: Author(s): Cédric Huwyler, Antoine Klein, and Philippe Jetzer We compute the accuracy at which a Laser Interferometer Space Antenna-like space-based gravitational wave detector will be able to observe deviations from general relativity in the low frequency approximation. To do so, we introduce six correction parameters that account for modified gravity in the ... [Phys. Rev. D 86, 084028] Published Tue Oct 09, 2012

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Campanelli-Lousto and veiled spacetimes (2012)

Luciano Vanzo, Sergio Zerbini, and Valerio Faraoni

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-12

Description: Author(s): Luciano Vanzo, Sergio Zerbini, and Valerio Faraoni The Campanelli-Lousto solutions of Brans-Dicke theory, usually reported as black holes, are reconsidered and shown to describe, according to the values of a parameter, wormholes or naked singularities. The veiled Schwarzschild metric recently used as an example to discuss conformal frames and their ... [Phys. Rev. D 86, 084031] Published Thu Oct 11, 2012

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Squeezed coherent states for noncommutative spaces with minimal length uncertainty relations (2012)

Sanjib Dey and Andreas Fring

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-25

Description: Author(s): Sanjib Dey and Andreas Fring We provide an explicit construction for Gazeau-Klauder coherent states related to non-Hermitian Hamiltonians with discrete bounded below and nondegenerate eigenspectrum. The underlying spacetime structure is taken to be of a noncommutative type with associated uncertainty relations implying minimal ... [Phys. Rev. D 86, 064038] Published Mon Sep 24, 2012

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Do gauge fields really contribute negatively to black hole entropy? (2012)

William Donnelly and Aron C. Wall

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-27

Description: Author(s): William Donnelly and Aron C. Wall Quantum fluctuations of matter fields contribute to the thermal entropy of black holes. For free minimally coupled scalar and spinor fields, this contribution is precisely the entanglement entropy. For gauge fields, Kabat found an extra negative divergent “contact term” with no known statistical int... [Phys. Rev. D 86, 064042] Published Wed Sep 26, 2012

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Gravitational field of compact objects in general relativity (2012)

Kuantay Boshkayev, Hernando Quevedo, and Remo Ruffini

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-27

Description: Author(s): Kuantay Boshkayev, Hernando Quevedo, and Remo Ruffini We study some exact and approximate solutions of Einstein’s equations that can be used to describe the gravitational field of astrophysical compact objects in the limiting case of slow rotation and slight deformation. First, we show that none of the standard models obtained by using Fock’s method ca... [Phys. Rev. D 86, 064043] Published Wed Sep 26, 2012

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Critical phenomena at the threshold of immediate merger in binary black hole systems: The extreme mass ratio case (2012)

Carsten Gundlach, Sarp Akcay, Leor Barack, and Alessandro Nagar

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-05

Description: Author(s): Carsten Gundlach, Sarp Akcay, Leor Barack, and Alessandro Nagar In numerical simulations of black hole binaries, Pretorius and Khurana [ Classical Quantum Gravity 24 S83 (2007) ] have observed critical behavior at the threshold between scattering and immediate merger. The number of orbits scales as n ≃- γ ln⁡| p - p * | along any one-parameter family of initial data suc... [Phys. Rev. D 86, 084022] Published Thu Oct 04, 2012

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Cosmic string interactions induced by gauge and scalar fields (2012)

Daniel Kabat and Debajyoti Sarkar

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-05

Description: Author(s): Daniel Kabat and Debajyoti Sarkar We study the interaction between two parallel cosmic strings induced by gauge fields and by scalar fields with nonminimal couplings to curvature. For small deficit angles the gauge field behaves like a collection of nonminimal scalars with a specific value for the nonminimal coupling. We check this ... [Phys. Rev. D 86, 084021] Published Thu Oct 04, 2012

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Flipped SL(2,R) duality in five-dimensional supergravity (2012)

Shun’ya Mizoguchi and Shinya Tomizawa

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-12

Description: Author(s): Shun’ya Mizoguchi and Shinya Tomizawa The dimensional reduction of the bosonic sector of five-dimensional minimal supergravity to a Lorentzian four-dimensional spacetime leads to a theory with a massless axion and a dilaton coupled to gravity and two U (1) gauge fields and the dimensionally reduced equations of motion have S L (2, R )/ S O (2) -... [Phys. Rev. D 86, 024022] Published Wed Jul 11, 2012

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Statistical analysis of entropy correction from topological defects in loop black holes (2012)

Kinjalk Lochan and Cenalo Vaz

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-22

Description: Author(s): Kinjalk Lochan and Cenalo Vaz In this paper we discuss the entropy of quantum black holes in the Loop quantum gravity; formalism when the number of punctures on the horizon is treated as a quantum hair, that is we compute the black hole entropy in the grand canonical (area) ensemble. The entropy is a function of both the average... [Phys. Rev. D 86, 044035] Published Tue Aug 21, 2012

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On the validity of the adiabatic approximation in compact binary inspirals (2012)

Andrea Maselli, Leonardo Gualtieri, Francesco Pannarale, and Valeria Ferrari

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-21

Description: Author(s): Andrea Maselli, Leonardo Gualtieri, Francesco Pannarale, and Valeria Ferrari Using a semianalytical approach recently developed to model the tidal deformations of neutron stars in inspiralling compact binaries, we study the dynamical evolution of the tidal tensor, which we explicitly derive at second post-Newtonian order, and of the quadrupole tensor. Since we do not assume ... [Phys. Rev. D 86, 044032] Published Mon Aug 20, 2012

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61

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Mimicking dark matter in galaxy clusters through a nonminimal gravitational coupling with matter (2012)

Orfeu Bertolami, Pedro Frazão, and Jorge Páramos

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-21

Description: Author(s): Orfeu Bertolami, Pedro Frazão, and Jorge Páramos In this work, one shows that a specific nonminimal coupling between the scalar curvature and matter can mimic the dark matter component of galaxy clusters. For this purpose, one assesses the Abell cluster A586, a massive nearby relaxed cluster of galaxies in virial equilibrium, where direct mass est... [Phys. Rev. D 86, 044034] Published Mon Aug 20, 2012

Keywords: General relativity, gravitation

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Positioning systems in Minkowski space-time: Bifurcation problem and observational data (2012)

Bartolomé Coll, Joan Josep Ferrando, and Juan Antonio Morales-Lladosa

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-16

Description: Author(s): Bartolomé Coll, Joan Josep Ferrando, and Juan Antonio Morales-Lladosa In the framework of relativistic positioning systems in Minkowski space-time, the determination of the inertial coordinates of a user involves the bifurcation problem (which is the indeterminate location of a pair of different events receiving the same emission coordinates). To solve it, in addition... [Phys. Rev. D 86, 084036] Published Mon Oct 15, 2012

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Massive spin-2 and spin-1/2 no hair theorems for stationary axisymmetric black holes (2012)

Sourav Bhattacharya and Amitabha Lahiri

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-18

Description: Author(s): Sourav Bhattacharya and Amitabha Lahiri We present a proof of the no hair theorems corresponding to free massive nonperturbative Pauli-Fierz spin-2 and perturbative massive spin-1/2 fields for stationary axisymmetric de Sitter black hole spacetimes of dimension four with two commuting Killing vector fields. The applicability of these resu... [Phys. Rev. D 86, 084038] Published Wed Oct 17, 2012

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One-loop divergences in 6D conformal gravity (2012)

Yi Pang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-18

Description: Author(s): Yi Pang Using the exact renormalization group equation approach and background field method, we investigate the one-loop problem in a six-dimensional conformal gravity theory whose Lagrangian takes the same form as the holographic Weyl anomaly of multiple coincident M5-branes. We choose the backgrounds to b... [Phys. Rev. D 86, 084039] Published Wed Oct 17, 2012

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Hairy mass bound in the Einstein-Born-Infeld black hole (2012)

Yun Soo Myung and Taeyoon Moon

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-24

Description: Author(s): Yun Soo Myung and Taeyoon Moon We study the Einstein-Born-Infeld (EBI) theory where the hairy black hole was found as the EBI black hole by using Hod’s idea. The hair extends beyond the photon sphere of the EBI black hole spacetimes. We show that the region beyond the photon sphere involves more than half of the total hair’s mass... [Phys. Rev. D 86, 084047] Published Tue Oct 23, 2012

Keywords: General relativity, gravitation

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Black holes with nonminimal derivative coupling (2012)

Massimiliano Rinaldi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-24

Description: Author(s): Massimiliano Rinaldi We study the gravitational field equations in the presence of a coupling between the derivative of a massless scalar field and the Einstein tensor. This configuration is motivated by Galileon gravity as it preserves shift invariance in the scalar sector. We analytically obtain solutions with static ... [Phys. Rev. D 86, 084048] Published Tue Oct 23, 2012

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Cosmological evolution of finite temperature Bose-Einstein condensate dark matter (2012)

Tiberiu Harko and Gabriela Mocanu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-13

Description: Author(s): Tiberiu Harko and Gabriela Mocanu Once the temperature of a bosonic gas is smaller than the critical, density dependent, transition temperature, a Bose-Einstein condensation process can take place during the cosmological evolution of the Universe. Bose-Einstein condensates are very strong candidates for dark matter, since they can s... [Phys. Rev. D 85, 084012] Published Thu Apr 12, 2012

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Search for continuous gravitational waves: Optimal StackSlide method at fixed computing cost (2012)

R. Prix and M. Shaltev

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-11

Description: Author(s): R. Prix and M. Shaltev Coherent wide parameter-space searches for continuous gravitational waves are typically limited in sensitivity by their prohibitive computing cost. Therefore, semicoherent methods (such as StackSlide) can often achieve a better sensitivity. We develop an analytical method for finding optimal StackSl... [Phys. Rev. D 85, 084010] Published Tue Apr 10, 2012

Keywords: General relativity, gravitation

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Spin-3 quasinormal modes of the BTZ black hole (2012)

Yun Soo Myung, Yong-Wan Kim, and Young-Jai Park

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-07

Description: Author(s): Yun Soo Myung, Yong-Wan Kim, and Young-Jai Park Using the operator approach, we obtain quasinormal modes (QNMs) of the Bañados-Teitelboim-Zanelli black hole in spin-3 topologically massive gravity by solving the first-order equation of motion with the transverse-traceless condition. We find that these are different from those obtained when solvin... [Phys. Rev. D 85, 084007] Published Fri Apr 06, 2012

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Rastall cosmology and the ΛCDM model (2012)

Carlos E. M. Batista, Mahamadou H. Daouda, Júlio C. Fabris, Oliver F. Piattella, and Davi C. Rodrigues

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-07

Description: Author(s): Carlos E. M. Batista, Mahamadou H. Daouda, Júlio C. Fabris, Oliver F. Piattella, and Davi C. Rodrigues Rastall’s theory is based on the nonconservation of the energy-momentum tensor. We show that, in this theory, if we introduce a two-fluid model, one component representing vacuum energy whereas the other pressureless matter (e.g. baryons plus cold dark matter), the cosmological scenario is the same ... [Phys. Rev. D 85, 084008] Published Fri Apr 06, 2012

Keywords: General relativity, gravitation

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An effective action for asymptotically safe gravity (2012)

Alfio Bonanno

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-10

Description: Author(s): Alfio Bonanno Asymptotically safe theories of gravitation have received great attention in recent times. In this framework an effective action embodying the basic features of the renormalized flow around the non-Gaussian fixed-point is derived and its implications for the early universe are discussed. In particul... [Phys. Rev. D 85, 081503] Published Mon Apr 09, 2012

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Local Hamiltonian for spherically symmetric collapse: Geometrodynamics approach (2012)

Jack Gegenberg and Gabor Kunstatter

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-12

Description: Author(s): Jack Gegenberg and Gabor Kunstatter Recently, a local true (completely gauge fixed) Hamiltonian for spherically symmetric collapse was derived in terms of Ashtekar variables. We show that such a local Hamiltonian follows directly from the geometrodynamics of gravity theories that obey a Birkhoff theorem and possess a mass function tha... [Phys. Rev. D 85, 084011] Published Wed Apr 11, 2012

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Alternative approach to solving the Hamiltonian constraint (2012)

Thomas W. Baumgarte

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-13

Description: Author(s): Thomas W. Baumgarte Solving Einstein’s constraint equations for the construction of black hole initial data requires handling the black hole singularity. Typically, this is done either with the excision method, in which the black hole interior is excised from the numerical grid, or with the puncture method, in which th... [Phys. Rev. D 85, 084013] Published Thu Apr 12, 2012

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Covariant master theory for novel Galilean invariant models and massive gravity (2012)

Gregory Gabadadze, Kurt Hinterbichler, Justin Khoury, David Pirtskhalava, and Mark Trodden

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-05

Description: Author(s): Gregory Gabadadze, Kurt Hinterbichler, Justin Khoury, David Pirtskhalava, and Mark Trodden Coupling the Galileons to a curved background has been a tradeoff between maintaining second order equations of motion and the Galilean shift symmetries, and allowing the background metric to be dynamical. We propose a construction which can achieve all three for a novel class of Galilean invariant ... [Phys. Rev. D 86, 124004] Published Tue Dec 04, 2012

Keywords: General relativity, gravitation

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Dynamical collapse of charged scalar field in phantom gravity (2012)

Anna Nakonieczna, Marek Rogatko, and Rafał Moderski

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-29

Description: Author(s): Anna Nakonieczna, Marek Rogatko, and Rafał Moderski We investigate the problem of the dynamical collapse of a self-gravitating complex charged scalar field in Einstein-Maxwell-dilaton theory with a phantom coupling for the adequate fields in the system under consideration. We also consider two simplifications, i.e., the separate collapses of phantom ... [Phys. Rev. D 86, 044043] Published Tue Aug 28, 2012

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Celestial ephemerides in an expanding universe (2012)

Sergei M. Kopeikin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-05

Description: Author(s): Sergei M. Kopeikin The post-Newtonian theory of motion of celestial bodies and propagation of light was instrumental in conducting the critical experimental tests of general relativity and in building the astronomical ephemerides of celestial bodies in the Solar System with unparalleled precision. The cornerstone of t... [Phys. Rev. D 86, 064004] Published Tue Sep 04, 2012

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Ultrahigh energy particle collisions in a regular spacetime without black holes or naked singularities (2012)

Mandar Patil and Pankaj S. Joshi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): Mandar Patil and Pankaj S. Joshi We investigate here the particle acceleration and collisions with extremely large center-of-mass energies in a perfectly regular spacetime containing neither singularity nor an event horizon. The ultrahigh energy collisions of particles near the event horizon of extremal Kerr black hole, and also in... [Phys. Rev. D 86, 044040] Published Fri Aug 24, 2012

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Spectra, vacua, and the unitarity of Lovelock gravity in D-dimensional AdS spacetimes (2012)

Tahsin Çağrı Şişman, İbrahim Güllü, and Bayram Tekin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): Tahsin Çağrı Şişman, İbrahim Güllü, and Bayram Tekin We explicitly confirm the expectation that generic Lovelock gravity in D dimensions has a unitary massless spin-2 excitation around any one of its constant curvature vacua just like the cosmological Einstein gravity. The propagator of the theory reduces to that of Einstein’s gravity, but scattering ... [Phys. Rev. D 86, 044041] Published Fri Aug 24, 2012

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Matter outside a static higher-dimensional black hole (2012)

Marek Rogatko

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-05

Description: Author(s): Marek Rogatko We considered matter fields composed of a perfect fluid in the static higher-dimensional spherically symmetric asymptotically flat black hole spacetime. The proof of the nonexistence of perfect fluid matter in such a background was provided under the auxiliary condition, which can be interpreted as ... [Phys. Rev. D 86, 064005] Published Tue Sep 04, 2012

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Scalar graviton in n-DBI gravity (2012)

Flávio S. Coelho, Carlos Herdeiro, Shinji Hirano, and Yuki Sato

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-05

Description: Author(s): Flávio S. Coelho, Carlos Herdeiro, Shinji Hirano, and Yuki Sato n -DBI gravity is a gravitational theory which yields near de Sitter inflation spontaneously at the cost of breaking Lorentz invariance by a preferred choice of foliation. We show that this breakdown endows n -DBI gravity with one extra physical gravitational degree of freedom: a scalar graviton . Its ... [Phys. Rev. D 86, 064009] Published Tue Sep 04, 2012

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Hawking radiation from “phase horizons” in laser filaments? (2012)

W. G. Unruh and R. Schützhold

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-05

Description: Author(s): W. G. Unruh and R. Schützhold Belgiorno et al. have reported on experiments aiming at the detection of (the analogue of) Hawking radiation using laser filaments [F. Belgiorno et al. , Phys. Rev. Lett. 105 203901 (2010)]. They sent intense focused Bessel pulses into a nonlinear dielectric medium in order to change its refractive... [Phys. Rev. D 86, 064006] Published Tue Sep 04, 2012

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Three-dimensional evolution of differentially rotating magnetized neutron stars (2012)

Kenta Kiuchi, Koutarou Kyutoku, and Masaru Shibata

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-05

Description: Author(s): Kenta Kiuchi, Koutarou Kyutoku, and Masaru Shibata We construct a new three-dimensional general relativistic magnetohydrodynamics code, in which a fixed mesh refinement technique is implemented. To ensure the divergence-free condition as well as the magnetic flux conservation, we employ the method by Balsara [ J. Comp. Physiol. 174 614 (2001); J.... [Phys. Rev. D 86, 064008] Published Tue Sep 04, 2012

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Brill wave initial data: Using the Galerkin-collocation method (2012)

H. P. de Oliveira and E. L. Rodrigues

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-05

Description: Author(s): H. P. de Oliveira and E. L. Rodrigues In this paper, we have implemented the Galerkin-collocation method to determine the initial data in two cases of interest for numerical relativity: vacuum axisymmetric Brill waves, and the interaction of axisymmetric Brill waves with a nonrotating black hole, or a distorted black hole. The numerical... [Phys. Rev. D 86, 064007] Published Tue Sep 04, 2012

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Weyl fluid dark matter model tested on the galactic scale by weak gravitational lensing (2012)

K. C. Wong, T. Harko, K. S. Cheng, and L. Á. Gergely

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-24

Description: Author(s): K. C. Wong, T. Harko, K. S. Cheng, and L. Á. Gergely The higher-dimensional Weyl curvature induces on the brane a new source of gravity. This Weyl fluid of geometrical origin (reducing in the spherically symmetric, static configuration to a dark radiation and dark pressure) modifies spacetime geometry around galaxies and has been shown to explain the ... [Phys. Rev. D 86, 044038] Published Thu Aug 23, 2012

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Higher-dimensional Kundt waves and gyratons (2012)

Pavel Krtouš, Jiří Podolský, Andrei Zelnikov, and Hedvika Kadlecová

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): Pavel Krtouš, Jiří Podolský, Andrei Zelnikov, and Hedvika Kadlecová We present and analyze exact solutions of the Einstein-Maxwell equations in higher dimensions which form a large subclass of the Kundt family of spacetimes. We assume that the cosmological constant may be nonvanishing, and the matter consists of a background aligned electromagnetic field and an addi... [Phys. Rev. D 86, 044039] Published Fri Aug 24, 2012

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Narrow resonances and black-hole-like absorption in a non-black-hole metric (2012)

V. V. Flambaum, G. H. Gossel, and G. F. Gribakin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-28

Description: Author(s): V. V. Flambaum, G. H. Gossel, and G. F. Gribakin A massive body with the Schwarzschild interior metric (perfect fluid of constant density) develops a pressure singularity at the origin when the radius of the body R approaches 9 r s /8, where r s is the Schwarzschild radius. We show that a quantum scalar particle scattered in this gravitational field p... [Phys. Rev. D 86, 044042] Published Mon Aug 27, 2012

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Modified gravity with a nonminimal gravitational coupling to matter (2012)

Yousef Bisabr

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-16

Description: Author(s): Yousef Bisabr We consider modified theories of gravity with a direct coupling between matter and geometry, denoted by an arbitrary function in terms of the Ricci scalar. Because of such a coupling, the matter stress tensor is no longer conserved and there is an energy transfer between the two components. By solvi... [Phys. Rev. D 86, 044025] Published Wed Aug 15, 2012

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Generic spherically symmetric dynamic thin-shell traversable wormholes in standard general relativity (2012)

Nadiezhda Montelongo Garcia, Francisco S. N. Lobo, and Matt Visser

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-16

Description: Author(s): Nadiezhda Montelongo Garcia, Francisco S. N. Lobo, and Matt Visser We consider the construction of generic spherically symmetric thin-shell traversable wormhole spacetimes in standard general relativity. By using the cut-and-paste procedure, we comprehensively analyze the stability of arbitrary spherically symmetric thin-shell wormholes to linearized spherically sy... [Phys. Rev. D 86, 044026] Published Wed Aug 15, 2012

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Classical self-energy and anomaly (2012)

Valeri P. Frolov and Andrei Zelnikov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-16

Description: Author(s): Valeri P. Frolov and Andrei Zelnikov We study the problem of self-energy of pointlike charges in higher dimensional static spacetimes. Their energy, as a functional of the spacetime metric, is invariant under a specific continuous transformation of the metric. We show that the procedure of regularization of this formally divergent func... [Phys. Rev. D 86, 044022] Published Wed Aug 15, 2012

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Black hole universe: Construction and analysis of initial data (2012)

Chul-Moon Yoo, Hiroyuki Abe, Yohsuke Takamori, and Ken-ichi Nakao

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-16

Description: Author(s): Chul-Moon Yoo, Hiroyuki Abe, Yohsuke Takamori, and Ken-ichi Nakao We numerically construct an one-parameter family of initial data of an expanding inhomogeneous universe model which is composed of regularly aligned black holes with an identical mass. They are initial data for vacuum solutions of the Einstein equations. We call this universe model the “black hole u... [Phys. Rev. D 86, 044027] Published Wed Aug 15, 2012

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91

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Kaluza-Klein vacuum multi-black holes in five dimensions (2012)

Ken Matsuno, Hideki Ishihara, Masashi Kimura, and Takamitsu Tatsuoka

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-22

Description: Author(s): Ken Matsuno, Hideki Ishihara, Masashi Kimura, and Takamitsu Tatsuoka We investigate five-dimensional vacuum solutions which represent rotating multiblack holes in asymptotically Kaluza-Klein spacetimes. We show that multiblack holes rotate maximally along extra dimension, and stationary configurations in vacuum are achieved by the balance of the gravitational attract... [Phys. Rev. D 86, 044036] Published Tue Aug 21, 2012

Keywords: General relativity, gravitation

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Slowly rotating black holes in dynamical Chern-Simons gravity: Deformation quadratic in the spin (2012)

Kent Yagi, Nicolás Yunes, and Takahiro Tanaka

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-22

Description: Author(s): Kent Yagi, Nicolás Yunes, and Takahiro Tanaka We derive a stationary and axisymmetric black hole solution to quadratic order in the spin angular momentum. The previously found, linear-in-spin terms modify the odd-parity sector of the metric, while the new corrections appear in the even-parity sector. These corrections modify the quadrupole mome... [Phys. Rev. D 86, 044037] Published Tue Aug 21, 2012

Keywords: General relativity, gravitation

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Nonlinear massive gravity with additional primary constraint and absence of ghosts (2012)

J. Klusoň

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-21

Description: Author(s): J. Klusoň We complete the Hamiltonian analysis of a specific model of nonlinear massive gravity that was started in 2012 [ J. Kluson J. High Energy Phys. 2012 170 ()]. We identify the primary constraint and corresponding secondary constraint. We show that they are the second class constraints and hence they ... [Phys. Rev. D 86, 044024] Published Mon Aug 20, 2012

Keywords: General relativity, gravitation

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C. D. Ott, E. Abdikamalov, E. O’Connor, C. Reisswig, R. Haas, P. Kalmus, S. Drasco, A. Burrows, and E. Schnetter

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-14

Description: Author(s): C. D. Ott, E. Abdikamalov, E. O’Connor, C. Reisswig, R. Haas, P. Kalmus, S. Drasco, A. Burrows, and E. Schnetter We present results from a new set of three-dimensional general-relativistic hydrodynamic simulations of rotating iron core collapse. We assume octant symmetry and focus on axisymmetric collapse, bounce, the early postbounce evolution, and the associated gravitational wave (GW) and neutrino signals. ... [Phys. Rev. D 86, 024026] Published Fri Jul 13, 2012

Keywords: General relativity, gravitation

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Upper limits of particle emission from high-energy collision and reaction near a maximally rotating Kerr black hole (2012)

Tomohiro Harada, Hiroya Nemoto, and Umpei Miyamoto

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-18

Description: Author(s): Tomohiro Harada, Hiroya Nemoto, and Umpei Miyamoto The center-of-mass energy of two particles colliding near the horizon of a maximally rotating black hole can be arbitrarily high if the angular momentum of either of the incident particles is fine-tuned, which we call a critical particle. We study particle emission from such high-energy collision an... [Phys. Rev. D 86, 024027] Published Tue Jul 17, 2012

Keywords: General relativity, gravitation

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Instabilities of wormholes and regular black holes supported by a phantom scalar field (2012)

K. A. Bronnikov, R. A. Konoplya, and A. Zhidenko

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-19

Description: Author(s): K. A. Bronnikov, R. A. Konoplya, and A. Zhidenko We test the stability of various wormholes and black holes supported by a scalar field with a negative kinetic term. The general axial perturbations and the monopole type of polar perturbations are considered in the linear approximation. Two classes of objects are considered: (i) wormholes with flat... [Phys. Rev. D 86, 024028] Published Wed Jul 18, 2012

Keywords: General relativity, gravitation

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Hairy black holes in massive gravity: Thermodynamics and phase structure (2012)

Fabio Capela and Germano Nardini

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-21

Description: Author(s): Fabio Capela and Germano Nardini The thermodynamic properties of a static and spherically symmetric hairy black hole solution arising in massive gravity with spontaneous Lorentz breaking are investigated. The analysis is carried out by enclosing the black hole in a spherical cavity whose surface is maintained at a fixed temperature... [Phys. Rev. D 86, 024030] Published Fri Jul 20, 2012

Keywords: General relativity, gravitation

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Characterizing Vainshtein solutions in massive gravity (2012)

Fulvio Sbisà, Gustavo Niz, Kazuya Koyama, and Gianmassimo Tasinato

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-24

Description: Author(s): Fulvio Sbisà, Gustavo Niz, Kazuya Koyama, and Gianmassimo Tasinato We study static, spherically symmetric solutions in a recently proposed ghost-free model of nonlinear massive gravity. We focus on a branch of solutions where the helicity-0 mode can be strongly coupled within certain radial regions, giving rise to the Vainshtein effect. We truncate the analysis to ... [Phys. Rev. D 86, 024033] Published Mon Jul 23, 2012

Keywords: General relativity, gravitation

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Tidal effects around higher-dimensional black holes (2012)

Richard Brito, Vitor Cardoso, and Paolo Pani

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-24

Description: Author(s): Richard Brito, Vitor Cardoso, and Paolo Pani In four-dimensional spacetime, moons around black holes generate low-amplitude tides, and the energy extracted from the hole’s rotation is always smaller than the gravitational radiation lost to infinity. Thus, moons orbiting a black hole inspiral and eventually merge. However, it has been conjectur... [Phys. Rev. D 86, 024032] Published Mon Jul 23, 2012

Keywords: General relativity, gravitation

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Quantum gravitational Kasner transitions in Bianchi-I spacetime (2012)

Brajesh Gupt and Parampreet Singh

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-24

Description: Author(s): Brajesh Gupt and Parampreet Singh Because of nonperturbative quantum gravitational effects, the classical big bang singularity is replaced by a quantum big bounce of the mean scale factor in loop quantization of Bianchi-I spacetime. An important issue is to understand the various differences in the physical properties of the spaceti... [Phys. Rev. D 86, 024034] Published Mon Jul 23, 2012

Keywords: General relativity, gravitation

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