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Mass of Kerr-Newman black holes in an external magnetic field (2016)

M. Astorino, G. Compère, R. Oliveri, and N. Vandevoorde

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-09

Beschreibung: Author(s): M. Astorino, G. Compère, R. Oliveri, and N. Vandevoorde The explicit solution for a Kerr-Newman black hole immersed in an external magnetic field, sometimes called the Melvin-Kerr-Newman black hole, has been derived by Ernst and Wild in 1976. In this paper, we clarify the first law and Smarr formula for black holes in a magnetic field. We then define the… [Phys. Rev. D 94, 024019] Published Thu Jul 07, 2016

Schlagwort(e): General Relativity and Gravitation

Print ISSN: 0556-2821

Digitale ISSN: 1089-4918

Thema: Physik

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How loud are neutron star mergers? (2016)

Sebastiano Bernuzzi, David Radice, Christian D. Ott, Luke F. Roberts, Philipp Mösta, and Filippo Galeazzi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-12

Beschreibung: Author(s): Sebastiano Bernuzzi, David Radice, Christian D. Ott, Luke F. Roberts, Philipp Mösta, and Filippo Galeazzi We present results from the first large parameter study of neutron star mergers using fully general relativistic simulations with finite-temperature microphysical equations of state and neutrino cooling. We consider equal and unequal-mass binaries drawn from the galactic population and simulate each… [Phys. Rev. D 94, 024023] Published Mon Jul 11, 2016

Schlagwort(e): General Relativity and Gravitation

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Gravitational waves in f(R,T) and f(R,T^{ϕ} ) theories of gravity (2016)

M. E. S. Alves, P. H. R. S. Moraes, J. C. N. de Araujo, and M. Malheiro

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-15

Beschreibung: Author(s): M. E. S. Alves, P. H. R. S. Moraes, J. C. N. de Araujo, and M. Malheiro There is a host of alternative theories of gravitation in the literature, among them the f ( R , T ) and f ( R , T ϕ ) theories recently elaborated by Harko et al. In these theories, R , T and T ϕ are respectively the Ricci scalar and the traces of the energy-momentum tensors of matter and of a scalar field. The… [Phys. Rev. D 94, 024032] Published Thu Jul 14, 2016

Schlagwort(e): General Relativity and Gravitation

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Consistent analytic approach to the efficiency of collisional Penrose process (2016)

Tomohiro Harada, Kota Ogasawara, and Umpei Miyamoto

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): Tomohiro Harada, Kota Ogasawara, and Umpei Miyamoto We propose a consistent analytic approach to the efficiency of collisional Penrose process in the vicinity of a maximally rotating Kerr black hole. We focus on a collision with arbitrarily high center-of-mass energy, which occurs if either of the colliding particles has its angular momentum fine-tun… [Phys. Rev. D 94, 024038] Published Wed Jul 20, 2016

Schlagwort(e): General Relativity and Gravitation

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Comparison of associated Higgs boson-radion and Higgs boson pair production processes (2016)

E. Boos, S. Keizerov, E. Rakhmetov, and K. Svirina

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-27

Beschreibung: Author(s): E. Boos, S. Keizerov, E. Rakhmetov, and K. Svirina Many models—in particular, the brane-world models with two branes—predict the existence of the scalar radion, whose mass can be somewhat smaller than those of all the Kaluza-Klein modes of the graviton and Standard Model (SM) particles. Due to its origin the radion interacts with the trace of the en… [Phys. Rev. D 94, 024047] Published Tue Jul 26, 2016

Schlagwort(e): General Relativity and Gravitation

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Twisted geometries, twistors, and conformal transformations (2016)

Miklos Långvik and Simone Speziale

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-27

Beschreibung: Author(s): Miklos Långvik and Simone Speziale The twisted geometries of spin network states are described by simple twistors, isomorphic to null twistors with a timelike direction singled out. The isomorphism depends on the Immirzi parameter γ and reduces to the identity for γ = ∞ . Using this twistorial representation, we study the action of the … [Phys. Rev. D 94, 024050] Published Tue Jul 26, 2016

Schlagwort(e): General Relativity and Gravitation

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Initial directional singularity in inflationary models (2016)

L. Fernández-Jambrina

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-27

Beschreibung: Author(s): L. Fernández-Jambrina In Haro, Amorós, and Pan [ Phys. Rev. D 93 , 084018 (2016)] a new cosmological model is proposed with no big bang singularity in the past, though past geodesically incomplete. This model starts with an inflationary era, follows with a stiff matter dominated period and evolves to accelerated expansion … [Phys. Rev. D 94, 024049] Published Tue Jul 26, 2016

Schlagwort(e): General Relativity and Gravitation

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Saturation of the f-mode instability in neutron stars. II. Applications and results (2016)

Pantelis Pnigouras and Kostas D. Kokkotas

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-29

Beschreibung: Author(s): Pantelis Pnigouras and Kostas D. Kokkotas We present the first results on the saturation of the f -mode instability in neutron stars due to nonlinear mode coupling. Emission of gravitational waves drives the f -mode (fundamental mode) unstable in fast-rotating, newborn neutron stars. The initial growth phase of the mode is followed by its sat… [Phys. Rev. D 94, 024053] Published Thu Jul 28, 2016

Schlagwort(e): General Relativity and Gravitation

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Regular black holes in f(R) gravity coupled to nonlinear electrodynamics (2016)

Manuel E. Rodrigues, Ednaldo L. B. Junior, Glauber T. Marques, and Vilson T. Zanchin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): Manuel E. Rodrigues, Ednaldo L. B. Junior, Glauber T. Marques, and Vilson T. Zanchin We obtain a class of regular black hole solutions in four-dimensional f ( R ) gravity, R being the curvature scalar, coupled to a nonlinear electromagnetic source. The metric formalism is used and static spherically symmetric spacetimes are assumed. The resulting f ( R ) and nonlinear electrodynamics func… [Phys. Rev. D 94, 024062] Published Fri Jul 29, 2016

Schlagwort(e): General Relativity and Gravitation

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Backreaction for Einstein-Rosen waves coupled to a massless scalar field (2016)

Sebastian J. Szybka and Michał J. Wyrębowski

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): Sebastian J. Szybka and Michał J. Wyrębowski We present a one-parameter family of exact solutions to Einstein’s equations that may be used to study the nature of the Green-Wald backreaction framework. Our explicit example is a family of Einstein-Rosen waves coupled to a massless scalar field. This solution may be reinterpreted as a generalized… [Phys. Rev. D 94, 024059] Published Fri Jul 29, 2016

Schlagwort(e): General Relativity and Gravitation

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Testing Einstein’s weak equivalence principle with gravitational waves (2016)

Xue-Feng Wu, He Gao, Jun-Jie Wei, Peter Mészáros, Bing Zhang, Zi-Gao Dai, Shuang-Nan Zhang, and Zong-Hong Zhu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): Xue-Feng Wu, He Gao, Jun-Jie Wei, Peter Mészáros, Bing Zhang, Zi-Gao Dai, Shuang-Nan Zhang, and Zong-Hong Zhu A conservative constraint on Einstein’s weak equivalence principle (WEP) can be obtained under the assumption that the observed time delay between correlated particles from astronomical sources is dominated by the gravitational fields through which they move. Current limits on the WEP are mainly bas… [Phys. Rev. D 94, 024061] Published Fri Jul 29, 2016

Schlagwort(e): General Relativity and Gravitation

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Hairy black holes in the general Skyrme model (2016)

C. Adam, O. Kichakova, Ya. Shnir, and A. Wereszczynski

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): C. Adam, O. Kichakova, Ya. Shnir, and A. Wereszczynski We study the existence of hairy black holes in the generalized Einstein-Skyrme model. It is proven that in the Bogomol’nyi-Prasad-Sommerfield model limit there are no hairy black hole solutions, although the model admits gravitating (and flat space) solitons. Furthermore, we find strong evidence tha… [Phys. Rev. D 94, 024060] Published Fri Jul 29, 2016

Schlagwort(e): General Relativity and Gravitation

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Reconstructing the evolution of the Universe from loop quantum cosmology scalar fields (2016)

V. K. Oikonomou

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-03

Beschreibung: Author(s): V. K. Oikonomou We extend the scalar-tensor reconstruction techniques for classical cosmology frameworks, in the context of loop quantum cosmology. After presenting in some detail how the equations are generalized in the loop quantum cosmology case, we discuss which new features and limitations the quantum framewor… [Phys. Rev. D 94, 044004] Published Tue Aug 02, 2016

Schlagwort(e): General Relativity and Gravitation

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Hybrid metric-Palatini brane system (2016)

Qi-Ming Fu, Li Zhao, Bao-Min Gu, Ke Yang, and Yu-Xiao Liu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-09

Beschreibung: Author(s): Qi-Ming Fu, Li Zhao, Bao-Min Gu, Ke Yang, and Yu-Xiao Liu It is known that the metric and Palatini formalisms of gravity theories have their own interesting features but also suffer from some different drawbacks. Recently, a novel gravity theory called hybrid metric-Palatini gravity was put forward to cure or improve their individual deficiencies. The acti… [Phys. Rev. D 94, 024020] Published Fri Jul 08, 2016

Schlagwort(e): General Relativity and Gravitation

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Geometry of the quantum Hall effect: An effective action for all dimensions (2016)

Dimitra Karabali and V. P. Nair

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-09

Beschreibung: Author(s): Dimitra Karabali and V. P. Nair We present a general formula for the topological part of the effective action for integer quantum Hall systems in higher dimensions, including fluctuations of the gauge field and metric around background fields of a specified topological class. The result is based on a procedure of integrating up fr… [Phys. Rev. D 94, 024022] Published Fri Jul 08, 2016

Schlagwort(e): General Relativity and Gravitation

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Axionic extension of the Einstein-aether theory (2016)

Alexander B. Balakin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-09

Beschreibung: Author(s): Alexander B. Balakin We extend the Einstein-aether theory to take into account the interaction between a pseudoscalar field, which describes the axionic dark matter, and a timelike dynamic unit vector field, which characterizes the velocity of the aether motion. The Lagrangian of the Einstein-aether-axion theory include… [Phys. Rev. D 94, 024021] Published Fri Jul 08, 2016

Schlagwort(e): General Relativity and Gravitation

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Dynamics of a spinning particle in a linear in spin Hamiltonian approximation (2016)

Georgios Lukes-Gerakopoulos, Matthaios Katsanikas, Panos A. Patsis, and Jonathan Seyrich

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-12

Beschreibung: Author(s): Georgios Lukes-Gerakopoulos, Matthaios Katsanikas, Panos A. Patsis, and Jonathan Seyrich We investigate for order and chaos the dynamical system of a spinning test particle of mass m moving in the spacetime background of a Kerr black hole of mass M . This system is approximated in our investigation by the linear in spin Hamiltonian function [E. Barausse and A. Buonanno, Phys. Rev. D 81 , … [Phys. Rev. D 94, 024024] Published Mon Jul 11, 2016

Schlagwort(e): General Relativity and Gravitation

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Critical phenomena in the extended phase space of Kerr-Newman-AdS black holes (2016)

Peng Cheng, Shao-Wen Wei, and Yu-Xiao Liu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-12

Beschreibung: Author(s): Peng Cheng, Shao-Wen Wei, and Yu-Xiao Liu Treating the cosmological constant as a thermodynamic pressure, we investigate the critical behavior of a Kerr-Newman-AdS black hole system. The critical points for the van der Waals like phase transition are numerically solved. The highly accurate fitting formula for them is given and is found to b… [Phys. Rev. D 94, 024025] Published Mon Jul 11, 2016

Schlagwort(e): General Relativity and Gravitation

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Primordial brusque bounce in Born-Infeld determinantal gravity (2016)

Franco Fiorini

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-14

Beschreibung: Author(s): Franco Fiorini We study a particular exact solution to the Born-Infeld determinantal gravity consisting of a cosmological model which undergoes a “brusque bounce.” The latter consists of an event characterized by a non-null (but finite) value of the squared Hubble rate H 2 occurring at a minimum (non-null) scale fa… [Phys. Rev. D 94, 024030] Published Wed Jul 13, 2016

Schlagwort(e): General Relativity and Gravitation

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Statistical modeling of the fluid dual to Boulware-Deser black hole (2016)

J. L. López, Swastik Bhattacharya, and S. Shankaranarayanan

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-14

Beschreibung: Author(s): J. L. López, Swastik Bhattacharya, and S. Shankaranarayanan In this work we study the statistical and thermodynamic properties of the horizon fluid corresponding to the Boulware-Deser (BD) black hole of Einstein-Gauss-Bonnet gravity. Using mean field theory, we show explicitly that the BD fluid exhibits the coexistence of two phases, a BEC (Bose Einstein Con… [Phys. Rev. D 94, 024029] Published Wed Jul 13, 2016

Schlagwort(e): General Relativity and Gravitation

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Stability of gravitating charged-scalar solitons in a cavity (2016)

Supakchai Ponglertsakul, Sam R. Dolan, and Elizabeth Winstanley

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-14

Beschreibung: Author(s): Supakchai Ponglertsakul, Sam R. Dolan, and Elizabeth Winstanley We present new regular solutions of Einstein-charged-scalar-field theory in a cavity. The system is enclosed inside a reflecting mirrorlike boundary, on which the scalar field vanishes. The mirror is placed at the zero of the scalar field closest to the origin, and inside this boundary our solutions… [Phys. Rev. D 94, 024031] Published Wed Jul 13, 2016

Schlagwort(e): General Relativity and Gravitation

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Critical behavior of charged black holes in Gauss-Bonnet gravity’s rainbow (2016)

Seyed Hossein Hendi, Shahram Panahiyan, Behzad Eslam Panah, Mir Faizal, and Mehrab Momennia

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-14

Beschreibung: Author(s): Seyed Hossein Hendi, Shahram Panahiyan, Behzad Eslam Panah, Mir Faizal, and Mehrab Momennia Following an earlier study regarding Gauss-Bonnet-Maxwell black holes in the presence of gravity’s rainbow [S. H. Hendi and M. Faizal, Phys. Rev. D 92 , 044027 (2015)], in this paper, we consider all constants as energy dependent ones. The geometrical and thermodynamical properties of this generaliza… [Phys. Rev. D 94, 024028] Published Wed Jul 13, 2016

Schlagwort(e): General Relativity and Gravitation

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Temperature and thermodynamic structure of Einstein’s equations for a cosmological black hole (2016)

Krishnakanta Bhattacharya and Bibhas Ranjan Majhi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-16

Beschreibung: Author(s): Krishnakanta Bhattacharya and Bibhas Ranjan Majhi It is expected that the cosmological black holes are the closest realistic solutions of gravitational theories and they evolve with time. Moreover, the natural way of defining thermodynamic entities for the stationary ones is not applicable in the case of a time dependent spacetime. Here we confine … [Phys. Rev. D 94, 024033] Published Fri Jul 15, 2016

Schlagwort(e): General Relativity and Gravitation

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Constraining f(T,T) gravity models using type Ia supernovae (2016)

Diego Sáez-Gómez, C. Sofia Carvalho, Francisco S. N. Lobo, and Ismael Tereno

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-16

Beschreibung: Author(s): Diego Sáez-Gómez, C. Sofia Carvalho, Francisco S. N. Lobo, and Ismael Tereno We present an analysis of an f ( T , T ) extension of the Teleparallel Equivalent of General Relativity, where T denotes the torsion and T denotes the trace of the energy-momentum tensor. This extension includes nonminimal couplings between torsion and matter. In particular, we construct two specific mod… [Phys. Rev. D 94, 024034] Published Fri Jul 15, 2016

Schlagwort(e): General Relativity and Gravitation

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Nonlocal form factors for curved-space antisymmetric fields (2016)

Tibério de Paula Netto and Ilya L. Shapiro

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): Tibério de Paula Netto and Ilya L. Shapiro In a recent paper, Buchbinder, Kirillova, and Pletnev presented formal arguments concerning the quantum equivalence of free massive antisymmetric tensor fields of the second and third rank to the free Proca theory and massive scalar field with minimal coupling to gravity, respectively. We confirm th… [Phys. Rev. D 94, 024040] Published Wed Jul 20, 2016

Schlagwort(e): General Relativity and Gravitation

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Towards the fundamental spectrum of the quantum Yang-Mills theory (2016)

Klaus Liegener and Thomas Thiemann

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-22

Beschreibung: Author(s): Klaus Liegener and Thomas Thiemann In this work we focus on the quantum Einstein-Yang-Mills sector quantized by the methods of loop quantum gravity. We point out the improved UV behavior of the coupled system as compared to pure quantum Yang-Mills theory on a fixed, classical background spacetime as was considered in a seminal work b… [Phys. Rev. D 94, 024042] Published Thu Jul 21, 2016

Schlagwort(e): General Relativity and Gravitation

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Holographic bound in covariant loop quantum gravity (2016)

Takashi Tamaki

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): Takashi Tamaki We investigate puncture statistics based on the covariant area spectrum in loop quantum gravity. First, we consider Maxwell-Boltzmann statistics with a Gibbs factor for punctures. We establish formulas which relate physical quantities such as horizon area to the parameter characterizing holographic … [Phys. Rev. D 94, 024045] Published Fri Jul 22, 2016

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Two interpretations of thin-shell instantons (2016)

Pisin Chen, Yao-Chieh Hu, and Dong-han Yeom

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): Pisin Chen, Yao-Chieh Hu, and Dong-han Yeom For O ( 4 ) -symmetric instantons, there are two complementary interpretations for their analytic continuations. One is the nothing-to-something interpretation, where the initial and final hypersurfaces are disconnected by Euclidean manifolds. The other is the something-to-something interpretation, intr… [Phys. Rev. D 94, 024044] Published Fri Jul 22, 2016

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Cosmological dynamics of spatially flat Einstein-Gauss-Bonnet models in various dimensions: Vacuum case (2016)

Sergey A. Pavluchenko

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): Sergey A. Pavluchenko In this paper we perform a systematic study of vacuum spatially flat anisotropic [ ( 3 + D ) + 1 ] -dimensional Einstein-Gauss-Bonnet cosmological models. We consider models that topologically are the product of two flat isotropic submanifolds with different scale factors. One of these submanifolds is three … [Phys. Rev. D 94, 024046] Published Mon Jul 25, 2016

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Shapes of rotating nonsingular black hole shadows (2016)

Muhammed Amir and Sushant G. Ghosh

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-29

Beschreibung: Author(s): Muhammed Amir and Sushant G. Ghosh It is believed that curvature singularities are a creation of general relativity and, hence, in the absence of a quantum gravity, models of nonsingular black holes have received significant attention. We study the shadow (apparent shape), an optical appearance because of its strong gravitational fie… [Phys. Rev. D 94, 024054] Published Thu Jul 28, 2016

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Moment of inertia of neutron star crust in alternative and modified theories of gravity (2016)

Kalin V. Staykov, K. Yavuz Ekşi, Stoytcho S. Yazadjiev, M. Metehan Türkoğlu, and A. Savaş Arapoğlu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-29

Beschreibung: Author(s): Kalin V. Staykov, K. Yavuz Ekşi, Stoytcho S. Yazadjiev, M. Metehan Türkoğlu, and A. Savaş Arapoğlu The glitch activity of young pulsars arises from the exchange of angular momentum between the crust and the interior of the star. Recently, it was inferred that the moment of inertia of the crust of a neutron star is not sufficient to explain the observed glitches. Such estimates are presumed in Ein… [Phys. Rev. D 94, 024056] Published Thu Jul 28, 2016

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Einstein-Maxwell-dilaton phantom black holes: Thermodynamics and geometrothermodynamics (2016)

Hernando Quevedo, María N. Quevedo, and Alberto Sánchez

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-29

Beschreibung: Author(s): Hernando Quevedo, María N. Quevedo, and Alberto Sánchez We use the Legendre-invariant formalism of geometrothermodynamics to investigate the geometric properties of the equilibrium space of a spherically symmetric phantom black hole with electric charge and dilaton. We find that at certain points of the equilibrium space the thermodynamic curvature is ch… [Phys. Rev. D 94, 024057] Published Thu Jul 28, 2016

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Causal dynamical triangulations in the spincube model of quantum gravity (2016)

Marko Vojinović

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-29

Beschreibung: Author(s): Marko Vojinović We study the implications of the simplicity constraint in the spincube model of quantum gravity. By relating the edge lengths to the integer areas of triangles, the simplicity constraint imposes very strong restrictions between them, ultimately leading to a requirement that all 4-simplices in the tr… [Phys. Rev. D 94, 024058] Published Thu Jul 28, 2016

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Pure Lovelock gravity and Chern-Simons theory (2016)

P. K. Concha, R. Durka, C. Inostroza, N. Merino, and E. K. Rodríguez

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-29

Beschreibung: Author(s): P. K. Concha, R. Durka, C. Inostroza, N. Merino, and E. K. Rodríguez We explore the possibility of finding pure Lovelock gravity as a particular limit of a Chern-Simons action for a specific expansion of the AdS algebra in odd dimensions. We derive in detail this relation at the level of the action in five and seven dimensions. We provide a general result for higher … [Phys. Rev. D 94, 024055] Published Thu Jul 28, 2016

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New volume and inverse volume operators for loop quantum gravity (2016)

Jinsong Yang and Yongge Ma

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): Jinsong Yang and Yongge Ma A new alternative volume operator is constructed for loop quantum gravity by using the so-called cotriad operators as building blocks. It is shown that the new volume operator shares the same qualitative properties with the standard volume operator. Moreover, a new alternative inverse volume operato… [Phys. Rev. D 94, 044003] Published Mon Aug 01, 2016

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Energy-momentum squared gravity (2016)

Mahmood Roshan and Fatimah Shojai

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): Mahmood Roshan and Fatimah Shojai A new covariant generalization of Einstein’s general relativity is developed which allows the existence of a term proportional to T α β T α β in the action functional of the theory ( T α β is the energy-momentum tensor). Consequently, the relevant field equations are different from general relativity only i… [Phys. Rev. D 94, 044002] Published Mon Aug 01, 2016

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Rotating and accelerating black holes with a cosmological constant (2016)

Yu Chen, Cheryl Ng, and Edward Teo

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): Yu Chen, Cheryl Ng, and Edward Teo We propose a new form of the rotating C-metric with cosmological constant, which generalizes the form found by Hong and Teo for the Ricci-flat case. This solution describes the entire class of spherical black holes undergoing rotation and acceleration in dS or AdS space-time. The new form allows us … [Phys. Rev. D 94, 044001] Published Mon Aug 01, 2016

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Canonical formulation and path integral for local vacuum energy sequestering (2016)

R. Bufalo, J. Klusoň, and M. Oksanen

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-05

Beschreibung: Author(s): R. Bufalo, J. Klusoň, and M. Oksanen We establish the Hamiltonian analysis and the canonical path integral for a local formulation of vacuum energy sequestering. In particular, by considering the state of the Universe as a superposition of vacuum states corresponding to different values of the cosmological and gravitational constants, … [Phys. Rev. D 94, 044005] Published Thu Aug 04, 2016

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Gyroscopes orbiting black holes: A frequency-domain approach to precession and spin-curvature coupling for spinning bodies on generic Kerr orbits (2016)

Uchupol Ruangsri, Sarah J. Vigeland, and Scott A. Hughes

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-06

Beschreibung: Author(s): Uchupol Ruangsri, Sarah J. Vigeland, and Scott A. Hughes A small body orbiting a black hole follows a trajectory that, at leading order, is a geodesic of the black hole spacetime. Much effort has gone into computing “self-force” corrections to this motion, arising from the small body’s own contributions to the system’s spacetime. Another correction to the… [Phys. Rev. D 94, 044008] Published Fri Aug 05, 2016

Schlagwort(e): General Relativity and Gravitation

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Geometry of deformed black holes. II. Schwarzschild hole surrounded by a Bach-Weyl ring (2016)

M. Basovník and O. Semerák

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-06

Beschreibung: Author(s): M. Basovník and O. Semerák We continue to study the response of black-hole space-times on the presence of additional strong sources of gravity. Restricting ourselves to static and axially symmetric (electro)vacuum exact solutions of Einstein’s equations, we first considered the Majumdar-Papapetrou solution for a binary of ext… [Phys. Rev. D 94, 044007] Published Thu Aug 04, 2016

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Geometry of deformed black holes. I. Majumdar-Papapetrou binary (2016)

O. Semerák and M. Basovník

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-06

Beschreibung: Author(s): O. Semerák and M. Basovník Although black holes are eminent manifestations of very strong gravity, the geometry of space-time around and even inside them can be significantly affected by additional bodies present in their surroundings. We study such an influence within static and axially symmetric (electro)vacuum space-times … [Phys. Rev. D 94, 044006] Published Thu Aug 04, 2016

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Background independence in a background dependent renormalization group (2016)

Peter Labus, Tim R. Morris, and Zöe H. Slade

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): Peter Labus, Tim R. Morris, and Zöe H. Slade Within the derivative expansion of conformally reduced gravity, the modified split Ward identities are shown to be compatible with the flow equations if and only if either the anomalous dimension vanishes or the cutoff profile is chosen to have a power-law form. No solutions exist if the Ward identi… [Phys. Rev. D 94, 024007] Published Wed Jul 06, 2016

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Geodesic equations in the static and rotating dilaton black holes: Analytical solutions and applications (2016)

Saheb Soroushfar, Reza Saffari, and Ehsan Sahami

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): Saheb Soroushfar, Reza Saffari, and Ehsan Sahami In this paper, we consider the timelike and null geodesics around the static (GMGHS, magnetically charged GMGHS, electrically charged GMGHS) and the rotating (Kerr-Sen dilaton-axion) dilaton black holes. The geodesic equations are solved in terms of Weierstrass elliptic functions. To classify the tr… [Phys. Rev. D 94, 024010] Published Wed Jul 06, 2016

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Probing deformed quantum commutators (2016)

Matteo A. C. Rossi, Tommaso Giani, and Matteo G. A. Paris

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): Matteo A. C. Rossi, Tommaso Giani, and Matteo G. A. Paris Several quantum gravity theories predict a minimal length at the order of magnitude of the Planck length, under which the concepts of space and time lose their physical meaning. In quantum mechanics, the insurgence of such a minimal length can be described by introducing a modified position-momentum… [Phys. Rev. D 94, 024014] Published Wed Jul 06, 2016

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Inflation and reheating in theories with spontaneous scale invariance symmetry breaking (2016)

Massimiliano Rinaldi and Luciano Vanzo

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): Massimiliano Rinaldi and Luciano Vanzo We study a scale-invariant model of quadratic gravity with a nonminimally coupled scalar field. We focus on cosmological solutions and find that scale invariance is spontaneously broken and a mass scale naturally emerges. Before the symmetry breaking, the Universe undergoes an inflationary expansion… [Phys. Rev. D 94, 024009] Published Wed Jul 06, 2016

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Asymptotic entropy bounds (2016)

Raphael Bousso

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): Raphael Bousso We show that known entropy bounds constrain the information carried off by radiation to null infinity. We consider distant, planar null hypersurfaces in asymptotically flat spacetime. Their focusing and area loss can be computed perturbatively on a Minkowski background, yielding entropy bounds in te… [Phys. Rev. D 94, 024018] Published Wed Jul 06, 2016

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Functional renormalization group analysis of tensorial group field theories on R^{d} (2016)

Joseph Ben Geloun, Riccardo Martini, and Daniele Oriti

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): Joseph Ben Geloun, Riccardo Martini, and Daniele Oriti Rank- d tensorial group field theories are quantum field theories (QFTs) defined on a group manifold G × d , which represent a nonlocal generalization of standard QFT and a candidate formalism for quantum gravity, since, when endowed with appropriate data, they can be interpreted as defining a field the… [Phys. Rev. D 94, 024017] Published Wed Jul 06, 2016

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Marginally stable circular orbits in stationary axisymmetric spacetimes (2016)

Shabnam Beheshti and Edgar Gasperín

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): Shabnam Beheshti and Edgar Gasperín We derive necessary and sufficient conditions for the existence of marginally stable circular orbits (MSCOs) of test particles in a stationary axisymmetric (SAS) spacetime which possesses a reflection symmetry with respect to the equatorial plane; photon orbits and marginally bound orbits (MBOs) are… [Phys. Rev. D 94, 024015] Published Wed Jul 06, 2016

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Viability of an arctan model of f(R) gravity for late-time cosmology (2016)

Koushik Dutta, Sukanta Panda, and Avani Patel

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-07

Beschreibung: Author(s): Koushik Dutta, Sukanta Panda, and Avani Patel f ( R ) modification of Einstein’s gravity is an interesting possibility to explain the late-time acceleration of the Universe. In this work we explore the cosmological viability of one such f ( R ) modification proposed by Kruglov [ Phys. Rev. D 89 , 064004 (2014)]. We show that the model violates fifth-fo… [Phys. Rev. D 94, 024016] Published Wed Jul 06, 2016

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Local Lorentz transformations and Thomas effect in general relativity (2016)

Alexander J. Silenko

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): Alexander J. Silenko The tetrad method is used for an introduction of local Lorentz frames and a detailed analysis of local Lorentz transformations. A formulation of equations of motion in local Lorentz frames is based on the Pomeransky-Khriplovich gravitoelectromagnetic fields. These fields are calculated in the most i… [Phys. Rev. D 93, 124050] Published Mon Jun 20, 2016

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Optomechanical tests of a Schrödinger-Newton equation for gravitational quantum mechanics (2016)

C. C. Gan, C. M. Savage, and S. Z. Scully

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): C. C. Gan, C. M. Savage, and S. Z. Scully We show that optomechanical systems can test the Schrödinger-Newton equation of gravitational quantum mechanics due to Yang et al. Phys. Rev. Lett. 110 , 170401 (2013). This equation is motivated by semiclassical gravity, a widely used theory of interacting gravitational and quantum fields. From the … [Phys. Rev. D 93, 124049] Published Mon Jun 20, 2016

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Gravitational-wave signal from binary neutron stars: A systematic analysis of the spectral properties (2016)

Luciano Rezzolla and Kentaro Takami

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Luciano Rezzolla and Kentaro Takami A number of works have shown that important information on the equation of state of matter at nuclear density can be extracted from the gravitational waves emitted by merging neutron-star binaries. We present a comprehensive analysis of the gravitational-wave signal emitted during the inspiral, merg… [Phys. Rev. D 93, 124051] Published Tue Jun 21, 2016

Schlagwort(e): General Relativity and Gravitation

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What is the entropy in entropic gravity? (2016)

Sean M. Carroll and Grant N. Remmen

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Sean M. Carroll and Grant N. Remmen We investigate theories in which gravity arises as a consequence of entropy. We distinguish between two approaches to this idea: holographic gravity , in which Einstein’s equation arises from keeping entropy stationary in equilibrium under variations of the geometry and quantum state of a small regio… [Phys. Rev. D 93, 124052] Published Tue Jun 21, 2016

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Nonadiabatic bounce and an inflationary phase in the quantum mixmaster universe (2016)

Hervé Bergeron, Ewa Czuchry, Jean-Pierre Gazeau, and Przemysław Małkiewicz

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Hervé Bergeron, Ewa Czuchry, Jean-Pierre Gazeau, and Przemysław Małkiewicz Following our previous paper, Bergeron et al. , Smooth quantum dynamics of the mixmaster universe, Phys. Rev. D 92 , 061302(R) (2015), concerning the quantization of the vacuum Bianchi IX model and the Born-Huang-Oppenheimer framework, we present a further analysis of the dynamical properties of the m… [Phys. Rev. D 93, 124053] Published Tue Jun 21, 2016

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Charged perfect fluid tori in strong central gravitational and dipolar magnetic fields (2016)

Jiří Kovář, Petr Slaný, Claudio Cremaschini, Zdeněk Stuchlík, Vladimír Karas, and Audrey Trova

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Jiří Kovář, Petr Slaný, Claudio Cremaschini, Zdeněk Stuchlík, Vladimír Karas, and Audrey Trova We study electrically charged perfect fluid toroidal structures encircling a spherically symmetric gravitating object with Schwarzschild spacetime geometry and endowed with a dipole magnetic field. The work represents a direct continuation of our previous general-relativistic studies of electrically… [Phys. Rev. D 93, 124055] Published Tue Jun 21, 2016

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Self-forces on static bodies in arbitrary dimensions (2016)

Abraham I. Harte, Éanna É. Flanagan, and Peter Taylor

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Abraham I. Harte, Éanna É. Flanagan, and Peter Taylor We derive exact expressions for the scalar and electromagnetic self-forces and self-torques acting on arbitrary static extended bodies in arbitrary static spacetimes with any number of dimensions. Nonperturbatively, our results are identical in all dimensions. Meaningful point particle limits are qu… [Phys. Rev. D 93, 124054] Published Tue Jun 21, 2016

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Note about a pure spin-connection formulation of general relativity and spin-2 duality in (A)dS (2016)

Thomas Basile, Xavier Bekaert, and Nicolas Boulanger

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-23

Beschreibung: Author(s): Thomas Basile, Xavier Bekaert, and Nicolas Boulanger We investigate the problem of finding a pure spin-connection formulation of general relativity with nonvanishing cosmological constant. We first revisit the problem at the linearized level and find that the pure spin-connection, quadratic Lagrangian, takes a form reminiscent to Weyl gravity, given b… [Phys. Rev. D 93, 124047] Published Tue Jun 21, 2016

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Neutron stars in Horndeski gravity (2016)

Andrea Maselli, Hector O. Silva, Masato Minamitsuji, and Emanuele Berti

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-24

Beschreibung: Author(s): Andrea Maselli, Hector O. Silva, Masato Minamitsuji, and Emanuele Berti Horndeski’s theory of gravity is the most general scalar-tensor theory with a single scalar whose equations of motion contain at most second-order derivatives. A subsector of Horndeski’s theory known as “Fab Four” gravity allows for dynamical self-tuning of the quantum vacuum energy, and therefore i… [Phys. Rev. D 93, 124056] Published Wed Jun 22, 2016

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Causes of irregular energy density in f(R,T) gravity (2016)

Z. Yousaf, Kazuharu Bamba, and M. Zaeem-ul-Haq Bhatti

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): Z. Yousaf, Kazuharu Bamba, and M. Zaeem-ul-Haq Bhatti We investigate irregularity factors for a self-gravitating spherical star evolving in the presence of an imperfect fluid. We explore the gravitational field equations and the dynamical equations with the systematic construction in f ( R , T ) gravity, where T is the trace of the energy-momentum tensor. F… [Phys. Rev. D 93, 124048] Published Mon Jun 20, 2016

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High post-Newtonian order gravitational self-force analytical results for eccentric equatorial orbits around a Kerr black hole (2016)

Donato Bini, Thibault Damour, and Andrea Geralico

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-25

Beschreibung: Author(s): Donato Bini, Thibault Damour, and Andrea Geralico We present the first analytic computation of the Detweiler-Barack-Sago gauge-invariant redshift function for a small mass in eccentric equatorial orbit around a spinning black hole. Our results give the redshift contributions that mix eccentricity and spin effects, through second order in eccentrici… [Phys. Rev. D 93, 124058] Published Thu Jun 23, 2016

Schlagwort(e): General Relativity and Gravitation

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Boson stars in biscalar extensions of Horndeski gravity (2016)

Yves Brihaye, Adolfo Cisterna, and Cristián Erices

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-25

Beschreibung: Author(s): Yves Brihaye, Adolfo Cisterna, and Cristián Erices This paper is concerned with the construction and analysis of boson stars in the context of nonminimal derivative coupling theories. In particular, we embed our model in the biscalar extension of Horndeski gravity, considering a scalar field theory displaying a nonminimally coupled kinetic term give… [Phys. Rev. D 93, 124057] Published Thu Jun 23, 2016

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Scattering of gravity waves in subcritical flows over an obstacle (2016)

Scott Robertson, Florent Michel, and Renaud Parentani

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-28

Beschreibung: Author(s): Scott Robertson, Florent Michel, and Renaud Parentani We numerically study the scattering coefficients of linear water waves on stationary flows above a localized obstacle. We compare the scattering on trans- and subcritical flows, and then focus on the latter which have been used in recent analog gravity experiments. The main difference concerns the m… [Phys. Rev. D 93, 124060] Published Fri Jun 24, 2016

Schlagwort(e): General Relativity and Gravitation

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Kinematics of particles with quantum-de Sitter-inspired symmetries (2016)

Leonardo Barcaroli and Giulia Gubitosi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-28

Beschreibung: Author(s): Leonardo Barcaroli and Giulia Gubitosi We present the first detailed study of the kinematics of free relativistic particles whose symmetries are compatible with the ones described by a quantum deformation of the de Sitter algebra, known as q –de Sitter Hopf algebra. In such algebra, the quantum deformation parameter is a function of the P… [Phys. Rev. D 93, 124063] Published Fri Jun 24, 2016

Schlagwort(e): General Relativity and Gravitation

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Electromagnetic perturbations in new brane world scenarios (2016)

C. Molina, A. B. Pavan, and T. E. Medina Torrejón

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): C. Molina, A. B. Pavan, and T. E. Medina Torrejón In this work, we consider electromagnetic dynamics in Randall-Sundrum branes. It is derived from a family of four-dimensional spacetimes compatible with Randall-Sundrum brane worlds, focusing on asymptotic flat backgrounds. Maximal extensions of the solutions are constructed, and their causal struct… [Phys. Rev. D 93, 124068] Published Mon Jun 27, 2016

Schlagwort(e): General Relativity and Gravitation

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precession : Dynamics of spinning black-hole binaries with python (2016)

Davide Gerosa and Michael Kesden

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): Davide Gerosa and Michael Kesden We present the numerical code precession , a new open-source python module to study the dynamics of precessing black-hole binaries in the post-Newtonian regime. The code provides a comprehensive toolbox to (i) study the evolution of the black-hole spins along their precession cycles, (ii) perform gra… [Phys. Rev. D 93, 124066] Published Mon Jun 27, 2016

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Consistency of scalar potentials from quantum de Sitter space (2016)

José R. Espinosa, Jean-François Fortin, and Maxime Trépanier

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): José R. Espinosa, Jean-François Fortin, and Maxime Trépanier Consistency of the unconventional view of de Sitter space as a quantum theory of gravity with a finite number of degrees of freedom requires that Coleman–De Luccia tunneling rates to vacua with negative cosmological constant should be interpreted as recurrences to low-entropy states. This demand tra… [Phys. Rev. D 93, 124067] Published Mon Jun 27, 2016

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Non-Abelian clouds around Reissner-Nordström black holes: The existence line (2016)

Eugen Radu, D. H. Tchrakian, and Yisong Yang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-06-29

Beschreibung: Author(s): Eugen Radu, D. H. Tchrakian, and Yisong Yang A known feature of electrically charged Reissner–Nordström–anti-de Sitter planar black holes is that they can become unstable when considered as solutions of Einstein-Yang-Mills theory. The mechanism for this is that the linearized Yang-Mills equations in the background of the Reissner-Nordström (RN… [Phys. Rev. D 93, 124069] Published Mon Jun 27, 2016

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Shadow of rotating regular black holes (2016)

Ahmadjon Abdujabbarov, Muhammed Amir, Bobomurat Ahmedov, and Sushant G. Ghosh

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): Ahmadjon Abdujabbarov, Muhammed Amir, Bobomurat Ahmedov, and Sushant G. Ghosh We study the shadows cast by the different types of rotating regular black holes viz. Ayón-Beato-García (ABG), Hayward, and Bardeen. These black holes have in addition to the total mass ( M ) and rotation parameter ( a ), different parameters as electric charge ( Q ), deviation parameter ( g ), and magnetic… [Phys. Rev. D 93, 104004] Published Tue May 03, 2016

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Instability of black strings in the third-order Lovelock theory (2016)

Alex Giacomini, Carla Henríquez-Báez, Marcela Lagos, Julio Oliva, and Aldo Vera

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): Alex Giacomini, Carla Henríquez-Báez, Marcela Lagos, Julio Oliva, and Aldo Vera We show that homogeneous black strings of third-order Lovelock theory are unstable under s-wave perturbations. This analysis is done in dimension D = 9 , which is the lowest dimension that allows the existence of homogeneous black strings in a theory that contains only the third-order Lovelock term in … [Phys. Rev. D 93, 104005] Published Tue May 03, 2016

Schlagwort(e): General Relativity and Gravitation

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Holographic Josephson junction from massive gravity (2016)

Ya-Peng Hu, Huai-Fan Li, Hua-Bi Zeng, and Hai-Qing Zhang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): Ya-Peng Hu, Huai-Fan Li, Hua-Bi Zeng, and Hai-Qing Zhang We study the holographic superconductor-normal metal-superconductor (SNS) Josephson junction in de Rham-Gabadadze-Tolley massive gravity. If the boundary theory is independent of spatial directions, i.e., if the chemical potential is homogeneous in spatial directions, we find that the graviton mass … [Phys. Rev. D 93, 104009] Published Tue May 03, 2016

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Cosmic censorship in Lorentz-violating theories of gravity (2016)

Michael Meiers, Mehdi Saravani, and Niayesh Afshordi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): Michael Meiers, Mehdi Saravani, and Niayesh Afshordi Is cosmic censorship special to general relativity, or can it survive a violation of local Lorentz invariance? Recent studies have shown that singularities in Lorentz -violating Einstein-Aether (or Horava-Lifshitz) theories can lie behind a universal horizon in simple black hole spacetimes. Even inf… [Phys. Rev. D 93, 104008] Published Tue May 03, 2016

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Prescriptions for measuring and transporting local angular momenta in general relativity (2016)

Éanna É. Flanagan, David A. Nichols, Leo C. Stein, and Justin Vines

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): Éanna É. Flanagan, David A. Nichols, Leo C. Stein, and Justin Vines For observers in curved spacetimes, elements of the dual space of the set of linearized Poincaré transformations from an observer’s tangent space to itself can be naturally interpreted as local linear and angular momenta. We present an operational procedure by which observers can measure such quanti… [Phys. Rev. D 93, 104007] Published Tue May 03, 2016

Schlagwort(e): General Relativity and Gravitation

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Spacetime dynamics of spinning particles: Exact electromagnetic analogies (2016)

L. Filipe O. Costa, José Natário, and Miguel Zilhão

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): L. Filipe O. Costa, José Natário, and Miguel Zilhão We compare the rigorous equations describing the motion of spinning test particles in gravitational and electromagnetic fields, and show that if the Mathisson-Pirani spin condition holds then exact gravito-electromagnetic analogies emerge. These analogies provide a familiar formalism to treat gravit… [Phys. Rev. D 93, 104006] Published Tue May 03, 2016

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Charged scalar perturbations around a regular magnetic black hole (2016)

Yang Huang and Dao-Jun Liu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): Yang Huang and Dao-Jun Liu We study charged scalar perturbations in the background of a regular magnetic black hole. In this case, the charged scalar perturbation does not result in superradiance. By using a careful time-domain analysis, we show that the charge of the scalar field can change the real part of the quasinormal f… [Phys. Rev. D 93, 104011] Published Tue May 03, 2016

Schlagwort(e): General Relativity and Gravitation

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Higher dimensional nonlinear massive gravity (2016)

Tuan Q. Do

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): Tuan Q. Do Inspired by a recent ghost-free nonlinear massive gravity in four-dimensional spacetime, we study its higher dimensional scenarios. As a result, we are able to show the constantlike behavior of massive graviton terms for some well-known metrics such as the Friedmann-Lemaitre-Robertson-Walker, Bianch… [Phys. Rev. D 93, 104003] Published Mon May 02, 2016

Schlagwort(e): General Relativity and Gravitation

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Probing the scale of new physics by Advanced LIGO/VIRGO (2016)

P. S. Bhupal Dev and A. Mazumdar

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): P. S. Bhupal Dev and A. Mazumdar We show that if the new physics beyond the standard model is associated with a first-order phase transition around 10 7 – 10 8 GeV , the energy density stored in the resulting stochastic gravitational waves and the corresponding peak frequency are within the projected final sensitivity of the advanced L… [Phys. Rev. D 93, 104001] Published Mon May 02, 2016

Schlagwort(e): General Relativity and Gravitation

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Quasilocal approach to general universal horizons (2016)

Alan Maciel

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-05

Beschreibung: Author(s): Alan Maciel Theories of gravity with a preferred foliation usually display arbitrarily fast signal propagation, changing the black hole definition. A new inescapable barrier, the universal horizon, has been defined and many static and spherically symmetric examples have been studied in the literature. Here, we … [Phys. Rev. D 93, 104013] Published Wed May 04, 2016

Schlagwort(e): General Relativity and Gravitation

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Rotating fermions inside a cylindrical boundary (2016)

Victor E. Ambruş and Elizabeth Winstanley

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-10

Beschreibung: Author(s): Victor E. Ambruş and Elizabeth Winstanley We study a quantum fermion field inside a cylinder in Minkowski space-time. On the surface of the cylinder, the fermion field satisfies either spectral or MIT bag boundary conditions. We define rigidly-rotating quantum states in both cases, assuming that the radius of the cylinder is sufficiently sm… [Phys. Rev. D 93, 104014] Published Mon May 09, 2016

Schlagwort(e): General Relativity and Gravitation

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Nonperturbative approach to relativistic quantum communication channels (2016)

André G. S. Landulfo

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-10

Beschreibung: Author(s): André G. S. Landulfo We investigate the transmission of both classical and quantum information between two arbitrary observers in globally hyperbolic spacetimes using a quantum field as a communication channel. The field is supposed to be in some arbitrary quasifree state and no choice of representation of its canonical… [Phys. Rev. D 93, 104019] Published Mon May 09, 2016

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Infinite efficiency of the collisional Penrose process: Can a overspinning Kerr geometry be the source of ultrahigh-energy cosmic rays and neutrinos? (2016)

Mandar Patil, Tomohiro Harada, Ken-ichi Nakao, Pankaj S. Joshi, and Masashi Kimura

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-10

Beschreibung: Author(s): Mandar Patil, Tomohiro Harada, Ken-ichi Nakao, Pankaj S. Joshi, and Masashi Kimura The origin of the ultrahigh-energy particles we receive on Earth from outer space such as EeV cosmic rays and PeV neutrinos remains an enigma. All mechanisms known to us currently make use of electromagnetic interaction to accelerate charged particles. In this paper, we propose a mechanism exclusive… [Phys. Rev. D 93, 104015] Published Mon May 09, 2016

Schlagwort(e): General Relativity and Gravitation

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Bell operator and Gaussian squeezed states in noncommutative quantum mechanics (2016)

Catarina Bastos, Alex E. Bernardini, Orfeu Bertolami, Nuno Costa Dias, and João Nuno Prata

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-28

Beschreibung: Author(s): Catarina Bastos, Alex E. Bernardini, Orfeu Bertolami, Nuno Costa Dias, and João Nuno Prata We examine putative corrections to the Bell operator due to the noncommutativity in the phase space. Starting from a Gaussian squeezed envelope whose time evolution is driven by commutative (standard quantum mechanics) and noncommutative dynamics, respectively, we conclude that although the time-evo… [Phys. Rev. D 93, 104055] Published Thu May 26, 2016

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Further evidence for asymptotic safety of quantum gravity (2016)

K. Falls, D. Litim, K. Nikolakopoulos, and C. Rahmede

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-12

Beschreibung: Author(s): K. Falls, D. Litim, K. Nikolakopoulos, and C. Rahmede The asymptotic safety conjecture is examined for quantum gravity in four dimensions. Using the renormalization group, we find evidence for an interacting UV fixed point for polynomial actions up to the 34th power in the Ricci scalar. The extrapolation to infinite polynomial order is given, and the s… [Phys. Rev. D 93, 104022] Published Wed May 11, 2016

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Accuracy of the post-Newtonian approximation for extreme mass ratio inspirals from a black-hole perturbation approach (2016)

Norichika Sago, Ryuichi Fujita, and Hiroyuki Nakano

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-05-12

Beschreibung: Author(s): Norichika Sago, Ryuichi Fujita, and Hiroyuki Nakano We revisit the accuracy of the post-Newtonian (PN) approximation and its region of validity for quasicircular orbits of a point particle in the Kerr spacetime, by using an analytically known highest post-Newtonian order gravitational energy flux and accurate numerical results in the black hole pertu… [Phys. Rev. D 93, 104023] Published Wed May 11, 2016

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Holographic proof of the quantum null energy condition (2016)

Jason Koeller and Stefan Leichenauer

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-13

Beschreibung: Author(s): Jason Koeller and Stefan Leichenauer We use holography to prove the quantum null energy condition (QNEC) at leading order in large N for CFTs and relevant deformations of CFTs in Minkowski space which have Einstein gravity duals. Given any codimension-two surface Σ which is locally stationary under a null deformation in the direction k … [Phys. Rev. D 94, 024026] Published Tue Jul 12, 2016

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Cylindrically symmetric wormholes WhCR^{e} : The motion of test particles (2016)

Asya V. Aminova, Dieter R. Brill, Pavel I. Chumarov, and Aleksandr Yu. Shemakhin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-19

Beschreibung: Author(s): Asya V. Aminova, Dieter R. Brill, Pavel I. Chumarov, and Aleksandr Yu. Shemakhin We study the radial and nonradial motion of massive test particles and photons in a three-parameter family of cylindrically symmetric wormholes WhC R e generated by the electromagnetic, dilaton, and scalar fields, with particular attention paid to the extent to which the wormhole is traversable. The w… [Phys. Rev. D 94, 024027] Published Mon Jul 18, 2016

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Search for astrophysical rotating Ellis wormholes with x-ray reflection spectroscopy (2016)

Menglei Zhou, Alejandro Cardenas-Avendano, Cosimo Bambi, Burkhard Kleihaus, and Jutta Kunz

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-19

Beschreibung: Author(s): Menglei Zhou, Alejandro Cardenas-Avendano, Cosimo Bambi, Burkhard Kleihaus, and Jutta Kunz Recently, two of us have found numerically rotating Ellis wormholes as solutions of four-dimensional Einstein gravity coupled to a phantom field. In this paper, we investigate possible observational signatures to identify similar objects in the Universe. These symmetric wormholes have a mass and are… [Phys. Rev. D 94, 024036] Published Mon Jul 18, 2016

Schlagwort(e): General Relativity and Gravitation

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Hawking radiation spectra for scalar fields by a higher-dimensional Schwarzschild–de Sitter black hole (2016)

T. Pappas, P. Kanti, and N. Pappas

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-19

Beschreibung: Author(s): T. Pappas, P. Kanti, and N. Pappas In this work, we study the propagation of scalar fields in the gravitational background of a higher-dimensional Schwarzschild–de Sitter black hole as well as on the projected-on-the-brane four-dimensional background. The scalar fields have also a nonminimal coupling to the corresponding, bulk or bra… [Phys. Rev. D 94, 024035] Published Mon Jul 18, 2016

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Geometrothermodynamics of black holes in Lorentz noninvariant massive gravity (2016)

Alberto Sánchez

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-20

Beschreibung: Author(s): Alberto Sánchez We analyze a static and spherically symmetric hairy black hole solution in noninvariant massive gravity. The formalism of geometrothermodynamics is used to describe the thermodynamic characteristics of this black hole in a Legendre invariant way. For a black hole in massive gravity, the geometry of … [Phys. Rev. D 94, 024037] Published Tue Jul 19, 2016

Schlagwort(e): General Relativity and Gravitation

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Light-cone fluctuations in the cosmic string spacetime (2016)

H. F. Mota, E. R. Bezerra de Mello, C. H. G. Bessa, and V. B. Bezerra

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): H. F. Mota, E. R. Bezerra de Mello, C. H. G. Bessa, and V. B. Bezerra In this paper we consider light-cone fluctuations arising as a consequence of the nontrivial topology of the locally flat cosmic string spacetime. By setting the light-cone along the z -direction we are able to develop a full analysis to calculate the renormalized graviton two-point function, as well… [Phys. Rev. D 94, 024039] Published Wed Jul 20, 2016

Schlagwort(e): General Relativity and Gravitation

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Novel quantum initial conditions for inflation (2016)

W. J. Handley, A. N. Lasenby, and M. P. Hobson

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-22

Beschreibung: Author(s): W. J. Handley, A. N. Lasenby, and M. P. Hobson We present a novel approach for setting initial conditions on the mode functions of the Mukhanov-Sasaki equation. These conditions are motivated by minimization of the renormalized stress-energy tensor and are valid for setting a vacuum state even in a context where the spacetime is changing rapidly… [Phys. Rev. D 94, 024041] Published Thu Jul 21, 2016

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Holography without counter terms (2016)

Byoungjoon Ahn, Seungjoon Hyun, Kyung Kiu Kim, Sang-A. Park, and Sang-Heon Yi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): Byoungjoon Ahn, Seungjoon Hyun, Kyung Kiu Kim, Sang-A. Park, and Sang-Heon Yi By considering the behavior of the reduced action under the scaling transformation, we present a unified derivation of the Smarr-like relation for asymptotically anti-de-Sitter planar black holes. This novel Smarr-like relation leads to useful information in the condensed matter systems through the … [Phys. Rev. D 94, 024043] Published Fri Jul 22, 2016

Schlagwort(e): General Relativity and Gravitation

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Detailed study of geodesics in the Kerr-Newman-(A)dS spacetime and the rotating charged black hole spacetime in f(R) gravity (2016)

Saheb Soroushfar, Reza Saffari, Sobhan Kazempour, Saskia Grunau, and Jutta Kunz

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-27

Beschreibung: Author(s): Saheb Soroushfar, Reza Saffari, Sobhan Kazempour, Saskia Grunau, and Jutta Kunz We perform a detailed study of the geodesic equations in the spacetime of the static and rotating charged black hole corresponding to the Kerr-Newman-(A)dS spacetime. We derive the equations of motion for test particles and light rays and present their solutions in terms of the Weierstrass ℘ , ζ , and… [Phys. Rev. D 94, 024052] Published Tue Jul 26, 2016

Schlagwort(e): General Relativity and Gravitation

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Accumulative coupling between magnetized tenuous plasma and gravitational waves (2016)

Fan Zhang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-27

Beschreibung: Author(s): Fan Zhang We explicitly compute the plasma wave (PW) induced by a plane gravitational wave (GW) traveling through a region of strongly magnetized plasma, governed by force-free electrodynamics. The PW comoves with the GW and absorbs its energy to grow over time, creating an essentially force-free counterpart … [Phys. Rev. D 94, 024048] Published Tue Jul 26, 2016

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Quantum sine-Gordon dynamics on analogue curved spacetime in a weakly imperfect scalar Bose gas (2016)

T. J. Volkoff and Uwe R. Fischer

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-07-27

Beschreibung: Author(s): T. J. Volkoff and Uwe R. Fischer Using the coherent state functional integral expression of the partition function, we show that the sine-Gordon model on an analogue curved spacetime arises as the effective quantum field theory for phase fluctuations of a weakly imperfect Bose gas on an incompressible background superfluid flow whe… [Phys. Rev. D 94, 024051] Published Tue Jul 26, 2016

Schlagwort(e): General Relativity and Gravitation

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Eccentric-orbit extreme-mass-ratio inspiral gravitational wave energy fluxes to 7PN order (2016)

Erik Forseth, Charles R. Evans, and Seth Hopper

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-03-25

Beschreibung: Author(s): Erik Forseth, Charles R. Evans, and Seth Hopper We present new results through 7PN order on the energy flux from eccentric extreme-mass-ratio binaries. The black hole perturbation calculations are made at very high accuracy (200 decimal places) using a Mathematica code based on the Mano-Suzuki-Takasugi analytic function expansion formalism. All p… [Phys. Rev. D 93, 064058] Published Thu Mar 24, 2016

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Influence of modification of gravity on the dynamics of radiating spherical fluids (2016)

Z. Yousaf, Kazuharu Bamba, and M. Zaeem ul Haq Bhatti

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-03-25

Beschreibung: Author(s): Z. Yousaf, Kazuharu Bamba, and M. Zaeem ul Haq Bhatti We explore the evolutionary behaviors of compact objects in a modified gravitational theory with the help of structure scalars. Particularly, we consider the spherical geometry coupled with heat- and radiation-emitting shearing viscous matter configurations. We construct structure scalars by splitti… [Phys. Rev. D 93, 064059] Published Thu Mar 24, 2016

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Properties of spatial wormholes and other splittable spacetimes (2016)

Richard H. Price

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-03-25

Beschreibung: Author(s): Richard H. Price The usefulness of the Morris-Thorne spatial wormhole motivates a consideration of a generalization to a class of similarly simple spacetime geometries. In this generalization, a “splittable” spacetime can be considered to be built of a parallel stack of identical 3-geometries. Such spacetimes do not… [Phys. Rev. D 93, 064060] Published Thu Mar 24, 2016

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Generalized Vaidya spacetime for cubic gravity (2016)

Shan-Ming Ruan

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-03-25

Beschreibung: Author(s): Shan-Ming Ruan We present a kind of generalized Vaidya solution of a new cubic gravity in five dimensions whose field equations in spherically symmetric spacetime are always second order like the Lovelock gravity. We also study the thermodynamics of its spherically symmetric apparent horizon and get its entropy ex… [Phys. Rev. D 93, 064061] Published Thu Mar 24, 2016

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Quasinormal modes of extremal black holes (2016)

Maurício Richartz

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-03-26

Beschreibung: Author(s): Maurício Richartz The continued fraction method (also known as Leaver’s method) is one of the most effective techniques used to determine the quasinormal modes of a black hole. For extremal black holes, however, the method does not work (since, in such a case, the event horizon is an irregular singular point of the a… [Phys. Rev. D 93, 064062] Published Fri Mar 25, 2016

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Numerical computation of the effective-one-body potential q using self-force results (2016)

Sarp Akcay and Maarten van de Meent

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-03-26

Beschreibung: Author(s): Sarp Akcay and Maarten van de Meent The effective-one-body theory (EOB) describes the conservative dynamics of compact binary systems in terms of an effective Hamiltonian approach. The Hamiltonian for moderately eccentric motion of two nonspinning compact objects in the extreme mass-ratio limit is given in terms of three potentials: a … [Phys. Rev. D 93, 064063] Published Fri Mar 25, 2016

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