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Spherically symmetric solution of f(R,G) gravity at low energy (2015)

Bofeng Wu and Bo-Qiang Ma

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Bofeng Wu and Bo-Qiang Ma The weak-field and slow-motion limit of f ( R , G ) gravity is developed up to ( v / c ) 4 order in a spherically symmetric background. Considering the Taylor expansion of a general function f around vanishing values of R and G , we present general vacuum solutions up to ( v / c ) 4 order for the gravitational fiel… [Phys. Rev. D 92, 044012] Published Mon Aug 10, 2015

Schlagwort(e): General Relativity and Gravitation

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Digitale ISSN: 1089-4918

Thema: Physik

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Intrinsic curvature of thermodynamic potentials for black holes with critical points (2015)

Brian P. Dolan

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Brian P. Dolan The geometry of thermodynamic state space is studied for asymptotically anti–de Sitter black holes in D -dimensional space-times. Convexity of thermodynamic potentials and the analytic structure of the response functions is analyzed. The thermodynamic potentials can be used to define a metric on the … [Phys. Rev. D 92, 044013] Published Tue Aug 11, 2015

Schlagwort(e): General Relativity and Gravitation

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New constraints on f(R) gravity from clusters of galaxies (2015)

Matteo Cataneo, David Rapetti, Fabian Schmidt, Adam B. Mantz, Steven W. Allen, Douglas E. Applegate, Patrick L. Kelly, Anja von der Linden, and R. Glenn Morris

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Matteo Cataneo, David Rapetti, Fabian Schmidt, Adam B. Mantz, Steven W. Allen, Douglas E. Applegate, Patrick L. Kelly, Anja von der Linden, and R. Glenn Morris The abundance of massive galaxy clusters is a powerful probe of departures from general relativity (GR) on cosmic scales. Despite current stringent constraints placed by stellar and galactic tests, on larger scales alternative theories of gravity such as f ( R ) can still work as effective theories. He… [Phys. Rev. D 92, 044009] Published Fri Aug 07, 2015

Schlagwort(e): General Relativity and Gravitation

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Parameter estimation of eccentric inspiraling compact binaries using an enhanced post circular model for ground-based detectors (2015)

Baosan Sun, Zhoujian Cao, Yan Wang, and Hsien-Chi Yeh

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Baosan Sun, Zhoujian Cao, Yan Wang, and Hsien-Chi Yeh Inspiraling compact binaries have been identified as one of the most promising sources for gravitational-wave detection. These binaries are always expected to have been circularized by the gravitational radiation when they enter the detector’s frequency band. However, recent studies indicate that so… [Phys. Rev. D 92, 044034] Published Wed Aug 19, 2015

Schlagwort(e): General Relativity and Gravitation

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Disformal dark energy at colliders (2015)

Philippe Brax, Clare Burrage, and Christoph Englert

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Philippe Brax, Clare Burrage, and Christoph Englert Disformally coupled, light scalar fields arise in many of the theories of dark energy and modified gravity that attempt to explain the accelerated expansion of the Universe. They have proved difficult to constrain with precision tests of gravity because they do not give rise to fifth forces around s… [Phys. Rev. D 92, 044036] Published Thu Aug 20, 2015

Schlagwort(e): General Relativity and Gravitation

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6

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Bekenstein bounds and inequalities between size, charge, angular momentum, and energy for bodies (2015)

Sergio Dain

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Sergio Dain Bekenstein bounds for the entropy of a body imply a universal inequality between size, energy, angular momentum, and charge. We prove this inequality in electromagnetism. We also prove it, for the particular case of zero angular momentum, in general relativity. We further discuss the relation of the… [Phys. Rev. D 92, 044033] Published Wed Aug 19, 2015

Schlagwort(e): General Relativity and Gravitation

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New scalar constraint operator for loop quantum gravity (2015)

Mehdi Assanioussi, Jerzy Lewandowski, and Ilkka Mäkinen

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Mehdi Assanioussi, Jerzy Lewandowski, and Ilkka Mäkinen We present a concrete and explicit construction of a new scalar constraint operator for loop quantum gravity. The operator is defined on the recently introduced space of partially diffeomorphism invariant states, and this space is preserved by the action of the operator. To define the Euclidean part… [Phys. Rev. D 92, 044042] Published Fri Aug 21, 2015

Schlagwort(e): General Relativity and Gravitation

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Energy in first order 2+1 gravity (2015)

Alejandro Corichi and Iraís Rubalcava-García

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Alejandro Corichi and Iraís Rubalcava-García We consider Λ = 0 three-dimensional gravity with asymptotically flat boundary conditions. This system was studied by Ashtekar and Varadarajan within the second-order formalism—with metric variables—who showed that the Regge-Teitelboim formalism yields a consistent Hamiltonian description where, surpri… [Phys. Rev. D 92, 044040] Published Fri Aug 21, 2015

Schlagwort(e): General Relativity and Gravitation

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9

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Classical resolution of black hole singularities in arbitrary dimension (2015)

D. Bazeia, L. Losano, Gonzalo J. Olmo, D. Rubiera-Garcia, and A. Sanchez-Puente

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): D. Bazeia, L. Losano, Gonzalo J. Olmo, D. Rubiera-Garcia, and A. Sanchez-Puente A metric-affine approach is employed to study higher-dimensional modified gravity theories involving different powers and contractions of the Ricci tensor. It is shown that the field equations are always second-order, as opposed to the standard metric approach, where this is only achieved for Lagran… [Phys. Rev. D 92, 044018] Published Wed Aug 12, 2015

Schlagwort(e): General Relativity and Gravitation

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Near-horizon circular orbits and extremal limit for dirty rotating black holes (2015)

O. B. Zaslavskii

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): O. B. Zaslavskii We consider generic rotating axially symmetric “dirty” (surrounded by matter) black holes. Near-horizon circular equatorial orbits are examined in two different cases of near-extremal (small surface gravity κ ) and exactly extremal black holes. This has a number of qualitative distinctions. In the fi… [Phys. Rev. D 92, 044017] Published Wed Aug 12, 2015

Schlagwort(e): General Relativity and Gravitation

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Higher-dimensional thin-shell wormholes in third-order Lovelock gravity (2015)

Mohammad Reza Mehdizadeh, Mahdi Kord Zangeneh, and Francisco S. N. Lobo

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Mohammad Reza Mehdizadeh, Mahdi Kord Zangeneh, and Francisco S. N. Lobo In this paper, we explore asymptotically flat charged thin-shell wormholes of third order Lovelock gravity in higher dimensions, taking into account the cut-and-paste technique. Using the generalized junction conditions, we determine the energy-momentum tensor of these solutions on the shell, and ex… [Phys. Rev. D 92, 044022] Published Fri Aug 14, 2015

Schlagwort(e): General Relativity and Gravitation

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Gauge and motion in perturbation theory (2015)

Adam Pound

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Adam Pound Through second order in perturbative general relativity, a small compact object in an external vacuum spacetime obeys a generalized equivalence principle: although it is accelerated with respect to the external background geometry, it is in free fall with respect to a certain effective vacuum geomet… [Phys. Rev. D 92, 044021] Published Fri Aug 14, 2015

Schlagwort(e): General Relativity and Gravitation

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Tensor modes in bigravity: Primordial to present (2015)

Matthew C. Johnson and Alexandra Terrana

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Matthew C. Johnson and Alexandra Terrana Massive bigravity, a theoretically consistent modification of general relativity with an additional dynamical rank-two tensor, successfully describes the observed accelerated expansion of the Universe without a cosmological constant. Recent analyses of perturbations around a cosmological background … [Phys. Rev. D 92, 044001] Published Mon Aug 03, 2015

Schlagwort(e): General Relativity and Gravitation

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Quasilocal rotating conformal Killing horizons (2015)

Ayan Chatterjee and Avirup Ghosh

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Ayan Chatterjee and Avirup Ghosh The formulation of quasilocal conformal Killing horizons (CKH) is extended to include rotation. This necessitates that the horizon be foliated by 2-spheres which may be distorted. Matter degrees of freedom which fall through the horizon are represented by a real scalar field. We show that these rota… [Phys. Rev. D 92, 044003] Published Mon Aug 03, 2015

Schlagwort(e): General Relativity and Gravitation

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Plane wave holonomies in quantum gravity. II. A sine wave solution (2015)

Donald E. Neville

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Donald E. Neville This paper constructs an approximate sinusoidal wave packet solution to the equations of canonical gravity. The theory uses holonomy-flux variables with support on a lattice ( LHF = lattice − holonomy flux ). There is an SU(2) holonomy on each edge of the LHF simplex, and the goal is to study the behavior… [Phys. Rev. D 92, 044006] Published Mon Aug 03, 2015

Schlagwort(e): General Relativity and Gravitation

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Experimental mathematics meets gravitational self-force (2015)

Nathan K. Johnson-Mc; Daniel, Abhay G. Shah, and Bernard F. Whiting

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Nathan K. Johnson-McDaniel, Abhay G. Shah, and Bernard F. Whiting This paper provides a means of extracting analytical expressions for Post-Newtonian expansion coefficients from accurate numerical work. It should prove extremely useful, especially to the growing community involved in detailed numerical work in General Relativity. [Phys. Rev. D 92, 044007] Published Tue Aug 04, 2015

Schlagwort(e): General Relativity and Gravitation

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Entangled squeezed states in noncommutative spaces with minimal length uncertainty relations (2015)

Sanjib Dey and Véronique Hussin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Sanjib Dey and Véronique Hussin We provide an explicit construction of entangled states in a noncommutative space with nonclassical states, particularly with the squeezed states. Noncommutative systems are found to be more entangled than the usual quantum mechanical systems. The noncommutative parameter provides an additional degr... [Phys. Rev. D 91, 124017] Published Thu Jun 04, 2015

Schlagwort(e): General Relativity and Gravitation

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Black hole initial data without elliptic equations (2015)

István Rácz and Jeffrey Winicour

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): István Rácz and Jeffrey Winicour We explore whether a new method to solve the constraints of Einstein’s equations can be applied to provide initial data for black holes. We show that this method, which does not involve elliptic equations, can be successfully applied to a nonlinear perturbation of a Schwarzschild black hole by estab... [Phys. Rev. D 91, 124013] Published Wed Jun 03, 2015

Schlagwort(e): General Relativity and Gravitation

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Comparison between self-force and post-Newtonian dynamics: Beyond circular orbits (2015)

Sarp Akcay, Alexandre Le Tiec, Leor Barack, Norichika Sago, and Niels Warburton

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Sarp Akcay, Alexandre Le Tiec, Leor Barack, Norichika Sago, and Niels Warburton The gravitational self-force (GSF) and post-Newtonian (PN) schemes are complementary approximation methods for modeling the dynamics of compact binary systems. Comparison of their results in an overlapping domain of validity provides a crucial test for both methods and can be used to enhance their a... [Phys. Rev. D 91, 124014] Published Wed Jun 03, 2015

Schlagwort(e): General Relativity and Gravitation

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20

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Physical infeasibility of geodesic dissipative dust as a source of gravitational radiation (2015)

L. Herrera, A. Di Prisco, and J. Ospino

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): L. Herrera, A. Di Prisco, and J. Ospino Using a framework based on the 1 + 3 formalism, we show that a source represented by a geodesic, dissipative, rotational dust, endowed with axial and reflection symmetry, violates regularity conditions at the center of the fluid distribution unless the dissipative flux vanishes. In this latter case, t... [Phys. Rev. D 91, 124015] Published Wed Jun 03, 2015

Schlagwort(e): General Relativity and Gravitation

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Post-Newtonian effects on the stability of the triangular solution in the three-body problem for general masses (2015)

Kei Yamada, Takuya Tsuchiya, and Hideki Asada

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Kei Yamada, Takuya Tsuchiya, and Hideki Asada Continuing work initiated in earlier publications [T. Ichita et al. , Phys. Rev. D 83 , 084026 (2011); K. Yamada and H. Asada, Phys. Rev. D 86 , 124029 (2012)], we examine the post-Newtonian (PN) effects on the stability of the triangular solution in the relativistic three-body problem for general mass... [Phys. Rev. D 91, 124016] Published Wed Jun 03, 2015

Schlagwort(e): General Relativity and Gravitation

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Note on linearized stability of Schwarzschild thin-shell wormholes with variable equations of state (2015)

Victor Varela

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Victor Varela We discuss how the assumption of variable equation of state (EoS) allows the elimination of the instability at equilibrium throat radius a 0 = 3 M featured by previous Schwarzschild thin-shell wormhole models. Unobstructed stability regions are found for three choices of variable EoS. Two of these EoS e… [Phys. Rev. D 92, 044002] Published Mon Aug 03, 2015

Schlagwort(e): General Relativity and Gravitation

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f(R)-modified gravity, Wald entropy, and the generalized uncertainty principle (2015)

Fayçal Hammad

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Fayçal Hammad Wald’s entropy formula allows one to find the entropy of black holes’ event horizon within any diffeomorphism invariant theory of gravity. When applied to general relativity, the formula yields the Bekenstein-Hawking result but, for any other gravitational action that departs from the Hilbert action… [Phys. Rev. D 92, 044004] Published Mon Aug 03, 2015

Schlagwort(e): General Relativity and Gravitation

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Plane wave holonomies in quantum gravity. I. A model (2015)

Donald E. Neville

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Donald E. Neville This is the first of two papers which study the behavior of the SU(2) holonomies of canonical quantum gravity, when they are acted upon by a unidirectional, plane gravity wave. The present paper constructs a model based on holonomies and fluxes having support on a lattice (LHF denotes lattice-holono… [Phys. Rev. D 92, 044005] Published Mon Aug 03, 2015

Schlagwort(e): General Relativity and Gravitation

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Inflation from cosmological constant and nonminimally coupled scalar (2015)

Dražen Glavan, Anja Marunović, and Tomislav Prokopec

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Dražen Glavan, Anja Marunović, and Tomislav Prokopec We consider inflation in a universe with a positive cosmological constant and a nonminimally coupled scalar field, in which the field couples both quadratically and quartically to the Ricci scalar. When considered in the Einstein frame and when the nonminimal couplings are negative, the field starts… [Phys. Rev. D 92, 044008] Published Tue Aug 04, 2015

Schlagwort(e): General Relativity and Gravitation

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Mass and thermodynamic volume in Lifshitz spacetimes (2015)

W. G. Brenna, Robert B. Mann, and Miok Park

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): W. G. Brenna, Robert B. Mann, and Miok Park We examine the concept of black hole thermodynamic volume and its consistency with thermodynamic mass in spacetimes that are not asymptotically flat but instead have anisotropic Lifshitz scaling symmetry. We find that the generalized Smarr relation in anti–de Sitter space—extended to include a press… [Phys. Rev. D 92, 044015] Published Tue Aug 11, 2015

Schlagwort(e): General Relativity and Gravitation

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Road to MOND: A novel perspective (2015)

Mordehai Milgrom

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Mordehai Milgrom Accepting that galactic mass discrepancies are due to modified dynamics, I show why it is specifically the Modified Newtonian dynamics (MOND) paradigm that is pointed to cogently. MOND is thus discussed here as a special case of a larger class of modified dynamics theories whereby galactic systems w… [Phys. Rev. D 92, 044014] Published Tue Aug 11, 2015

Schlagwort(e): General Relativity and Gravitation

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Analytical solutions of the geodesic equation in the spacetime of a black hole in f(R) gravity (2015)

Saheb Soroushfar, Reza Saffari, Jutta Kunz, and Claus Lämmerzahl

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Saheb Soroushfar, Reza Saffari, Jutta Kunz, and Claus Lämmerzahl We consider the motion of test particles in the spacetime of a black hole in f ( R ) gravity. The complete set of analytic solutions of the geodesic equation in the spacetime of this black hole is presented. The geodesic equations are solved in terms of Weierstrass elliptic functions and derivatives of… [Phys. Rev. D 92, 044010] Published Tue Aug 11, 2015

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Modified gravity in three dimensional metric-affine scenarios (2015)

Cosimo Bambi, M. Ghasemi-Nodehi, and D. Rubiera-Garcia

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Cosimo Bambi, M. Ghasemi-Nodehi, and D. Rubiera-Garcia We consider metric-affine scenarios where a modified gravitational action is sourced by electrovacuum fields in a three dimensional space-time. We first study the case of f ( R ) theories, finding deviations near the center as compared to the solutions of general relativity. We then consider Born-Infel… [Phys. Rev. D 92, 044016] Published Tue Aug 11, 2015

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Asymptotics with a positive cosmological constant. II. Linear fields on de Sitter spacetime (2015)

Abhay Ashtekar, Béatrice Bonga, and Aruna Kesavan

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Abhay Ashtekar, Béatrice Bonga, and Aruna Kesavan Linearized gravitational waves in de Sitter spacetime are analyzed in detail to obtain guidance for constructing the theory of gravitational radiation in presence of a positive cosmological constant in full, nonlinear general relativity. Specifically, (i) In the exact theory, the intrinsic geometry … [Phys. Rev. D 92, 044011] Published Tue Aug 11, 2015

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Entropy current in two dimensional anomalous hydrodynamics and a bound on the sum of the response parameters (2015)

Rabin Banerjee, Shirsendu Dey, and Bibhas Ranjan Majhi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Rabin Banerjee, Shirsendu Dey, and Bibhas Ranjan Majhi The exact expression for the entropy current of a fluid in presence of two dimensional gravitational anomalies is given. To make it compatible with the second law of thermodynamics; i.e. positivity of the entropy production rate of a system (which is considered to be fundamental), we find a bound on… [Phys. Rev. D 92, 044019] Published Thu Aug 13, 2015

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Inside the Schwarzschild-Tangherlini black holes (2015)

Jerzy Matyjasek and Paweł Sadurski

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Jerzy Matyjasek and Paweł Sadurski The first-order semiclassical Einstein field equations are solved in the interior of the Schwarzschild-Tangherlini black holes. The source term is taken to be the stress-energy tensor of the quantized massive scalar field with arbitrary curvature coupling calculated within the framework of the Schwi… [Phys. Rev. D 92, 044023] Published Fri Aug 14, 2015

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Neutron stars in Rastall gravity (2015)

A. M. Oliveira, H. E. S. Velten, J. C. Fabris, and L. Casarini

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): A. M. Oliveira, H. E. S. Velten, J. C. Fabris, and L. Casarini We calculate static and spherically symmetric solutions for the Rastall modification of gravity to describe neutron stars (NS). The key feature of the Rastall gravity is the nonconservation of the energy-momentum tensor proportionally to the space-time curvature. Using realistic equations of state f… [Phys. Rev. D 92, 044020] Published Fri Aug 14, 2015

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Parametrized post-Newtonian limit of Horndeski’s gravity theory (2015)

Manuel Hohmann

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): Manuel Hohmann We discuss the parametrized post-Newtonian (PPN) limit of Horndeski’s theory of gravity, also known under the name generalized G-inflation or G 2 -inflation, which is the most general scalar-tensor theory of gravity with at most second-order field equations in four dimensions. We derive conditions on … [Phys. Rev. D 92, 064019] Published Tue Sep 15, 2015

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Revision of the brick wall method for calculating the black hole thermodynamic quantities (2015)

F. Lenz, K. Ohta, and K. Yazaki

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): F. Lenz, K. Ohta, and K. Yazaki Within the framework of the “brick wall model,” a novel method is developed to compute the contributions of a scalar field to the thermodynamic quantities of black holes. The relations between (transverse) momenta and frequencies in Rindler space are determined numerically with high accuracy and ana… [Phys. Rev. D 92, 064018] Published Tue Sep 15, 2015

Schlagwort(e): General Relativity and Gravitation

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Scaling exponents for lattice quantum gravity in four dimensions (2015)

Herbert W. Hamber

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): Herbert W. Hamber In this work nonperturbative aspects of quantum gravity are investigated using the lattice formulation, and some new results are presented for critical exponents, amplitudes, and invariant correlation functions. Values for the universal scaling dimensions are compared with other nonperturbative appr… [Phys. Rev. D 92, 064017] Published Mon Sep 14, 2015

Schlagwort(e): General Relativity and Gravitation

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Lovelock black holes with a nonconstant curvature horizon (2015)

Seiju Ohashi and Masato Nozawa

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-17

Beschreibung: Author(s): Seiju Ohashi and Masato Nozawa This paper studies a class of D = n + 2 ( ≥ 6 ) dimensional solutions to Lovelock gravity that is described by the warped product of a two-dimensional Lorentzian metric and an n -dimensional Einstein space. Assuming that the angular part of the stress-energy tensor is proportional to the Einstein metric, it … [Phys. Rev. D 92, 064020] Published Tue Sep 15, 2015

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Bifurcation of the quasinormal spectrum and zero damped modes for rotating dilatonic black holes (2015)

K. D. Kokkotas, R. A. Konoplya, and A. Zhidenko

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-17

Beschreibung: Author(s): K. D. Kokkotas, R. A. Konoplya, and A. Zhidenko It has been recently found that for the near extremal Kerr black holes appearing of zero damped modes (accompanied by quasinormal mode branching) signifies about inapplicability of the regime of small perturbations and the onset of turbulence. Here we show that this phenomenon is not limited by Kerr… [Phys. Rev. D 92, 064022] Published Wed Sep 16, 2015

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Near horizon hidden symmetry and entropy of Sultana-Dyer black hole: A time dependent case (2015)

Bibhas Ranjan Majhi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-19

Beschreibung: Author(s): Bibhas Ranjan Majhi The nonextremal stationary black holes do have “hidden” conformal symmetry in which case the generators form the S L ( 2 , R ) group. Here, I explicitly show that the Sultana-Dyer black hole solution also possesses the similar near horizon conformal symmetry. This is the first example of a time dependent … [Phys. Rev. D 92, 064026] Published Fri Sep 18, 2015

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Metric perturbations produced by eccentric equatorial orbits around a Kerr black hole (2015)

Maarten van de Meent and Abhay G. Shah

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-19

Beschreibung: Author(s): Maarten van de Meent and Abhay G. Shah How does the spacetime geometry of a spinning (Kerr) black hole change when a much lighter mass orbits it in an elliptic trajectory in the equatorial plane? Combining analytic and numerical techniques, corrections to the metric as a function of the small mass ratio are reported. [Phys. Rev. D 92, 064025] Published Thu Sep 17, 2015

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Distinguishing general relativity and f(R) gravity with the gravitational lensing Minkowski functionals (2015)

Chenxiaoji Ling, Qiao Wang, Ran Li, Baojiu Li, Jie Wang, and Liang Gao

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-19

Beschreibung: Author(s): Chenxiaoji Ling, Qiao Wang, Ran Li, Baojiu Li, Jie Wang, and Liang Gao We explore the Minkowski functionals (MFs) of weak lensing convergence map to distinguish between f ( R ) gravity and the general relativity (GR). The mock weak lensing convergence maps are constructed with a set of high-resolution simulations assuming different gravity models. It is shown that the len… [Phys. Rev. D 92, 064024] Published Thu Sep 17, 2015

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Thermodynamics of Gauss-Bonnet-dilaton Lifshitz black branes (2015)

M. Kord Zangeneh, M. H. Dehghani, and A. Sheykhi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-19

Beschreibung: Author(s): M. Kord Zangeneh, M. H. Dehghani, and A. Sheykhi We explore an effective supergravity action in the presence of a massless gauge field which contains a Gauss-Bonnet term as well as a dilaton field. We construct a new class of black brane solutions of this theory with a Lifshitz asymptotic by fixing the parameters of the model such that the asympto… [Phys. Rev. D 92, 064023] Published Thu Sep 17, 2015

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Warped-AdS_{3} black holes with scalar halo (2015)

Gaston Giribet and Minas Tsoukalas

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-19

Beschreibung: Author(s): Gaston Giribet and Minas Tsoukalas We construct a stretched (aka warped) anti–de Sitter black hole in three dimensions supported by a real scalar field configuration. The latter is regular everywhere outside and on the horizon. No-hair theorems in three dimensions demand the matter be coupled to the curvature in a nonminimal way; how… [Phys. Rev. D 92, 064027] Published Thu Sep 17, 2015

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Valentino F. Foit and Nico Wintergerst

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-25

Beschreibung: Author(s): Valentino F. Foit and Nico Wintergerst We investigate Hawking evaporation in a recently suggested picture in which black holes are Bose condensates of gravitons at a quantum critical point. There, evaporation of a black hole is due to two intertwined effects. Coherent excitation of a tachyonic breathing mode is responsible for the collap… [Phys. Rev. D 92, 064043] Published Thu Sep 24, 2015

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Harvesting correlations from the quantum vacuum (2015)

Alejandro Pozas-Kerstjens and Eduardo Martín-Martínez

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-25

Beschreibung: Author(s): Alejandro Pozas-Kerstjens and Eduardo Martín-Martínez We analyze the harvesting of entanglement and classical correlations from the quantum vacuum to particle detectors. We assess the impact on the detectors’ harvesting ability of the spacetime dimensionality, the suddenness of the detectors’ switching, their physical size and their internal energy str… [Phys. Rev. D 92, 064042] Published Thu Sep 24, 2015

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Earth-moon Lagrangian points as a test bed for general relativity and effective field theories of gravity (2015)

Emmanuele Battista, Simone Dell’Agnello, Giampiero Esposito, Luciano Di Fiore, Jules Simo, and Aniello Grado

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-25

Beschreibung: Author(s): Emmanuele Battista, Simone Dell’Agnello, Giampiero Esposito, Luciano Di Fiore, Jules Simo, and Aniello Grado We first analyze the restricted four-body problem consisting of the Earth, the Moon, and the Sun as the primaries and a spacecraft as the planetoid. This scheme allows us to take into account the solar perturbation in the description of the motion of a spacecraft in the vicinity of the stable Earth-… [Phys. Rev. D 92, 064045] Published Thu Sep 24, 2015

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Hamiltonian formalism of minimal massive gravity (2015)

Davood Mahdavian Yekta

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-25

Beschreibung: Author(s): Davood Mahdavian Yekta In this paper, we study the three-dimensional minimal massive gravity (MMG) in the Hamiltonian formalism. At first, we define the canonical gauge generators as building blocks in this formalism and then derive the canonical expressions for the asymptotic conserved charges. The construction of a cons… [Phys. Rev. D 92, 064044] Published Thu Sep 24, 2015

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Photon spheres in Einstein and Einstein-Gauss-Bonnet theories and circular null geodesics in axially-symmetric spacetimes (2015)

Emanuel Gallo and J. R. Villanueva

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-29

Beschreibung: Author(s): Emanuel Gallo and J. R. Villanueva In this article we extend a recent theorem proven by Hod [Upper bound on the radii of black-hole photon spheres, Phys. Lett. B 727 , 345 (2013)] to n -dimensional Einstein and Einstein-Gauss-Bonnet theories, which gives an upper bound for the photon sphere radii of spherically symmetric black holes. A… [Phys. Rev. D 92, 064048] Published Mon Sep 28, 2015

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Cosmological disformal transformations to the Einstein frame and gravitational couplings with matter perturbations (2015)

Shinji Tsujikawa

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-29

Beschreibung: Author(s): Shinji Tsujikawa The disformal transformation of metric g μ ν → Ω 2 ( ϕ ) g μ ν + Γ ( ϕ , X ) ∂ μ ϕ ∂ ν ϕ , where ϕ is a scalar field with the kinetic energy X = ∂ μ ϕ ∂ μ ϕ / 2 , preserves the Lagrangian structure of Gleyzes–Langlois–Piazza–Vernizzi theories (which is the minimum extension of Horndeski theories). In the presence of matter, this tran… [Phys. Rev. D 92, 064047] Published Mon Sep 28, 2015

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Spectral indices in Eddington-inspired Born-Infeld inflation (2015)

Inyong Cho and Jinn-Ouk Gong

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-29

Beschreibung: Author(s): Inyong Cho and Jinn-Ouk Gong We investigate the scalar and tensor spectral indices of the quadratic inflation model in Eddington-inspired Born-Infeld (EiBI) gravity. We find that the EiBI corrections to the spectral indices are of second and first order in the slow-roll approximation for the scalar and tensor perturbations, res… [Phys. Rev. D 92, 064046] Published Fri Sep 25, 2015

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Maeda-Dadhich solutions as real black holes (2015)

S. O. Alexeyev, A. N. Petrov, and B. N. Latosh

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): S. O. Alexeyev, A. N. Petrov, and B. N. Latosh Four-dimensional static Schwarzschild-like solutions obtained in [H. Maeda and N. Dadhich, Phys. Rev. D 74 , 021501(R) (2006).H. Maeda and N. Dadhich, Phys. Rev. D 75 , 044007 (2007).N. Dadhich and H. Maeda, Int. J. Mod. Phys. D 17 , 513 (2008).A. Molina and N. Dadhich, Int. J. Mod. Phys. D 18 , 599 (20… [Phys. Rev. D 92, 104046] Published Tue Nov 24, 2015

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Stationary axially symmetric solutions in Brans-Dicke theory (2015)

Pınar Kirezli and Özgür Delice

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Pınar Kirezli and Özgür Delice Stationary, axially symmetric Brans-Dicke-Maxwell solutions are reexamined in the framework of the Brans-Dicke (BD) theory. We see that, employing a particular parametrization of the standard axially symmetric metric simplifies the procedure of obtaining the Ernst equations for axially symmetric ele… [Phys. Rev. D 92, 104045] Published Tue Nov 24, 2015

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Testing long-distance modifications of gravity to 100 astronomical units (2015)

Brandon Buscaino, Daniel De; Bra, Peter W. Graham, Giorgio Gratta, and Timothy D. Wiser

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Brandon Buscaino, Daniel DeBra, Peter W. Graham, Giorgio Gratta, and Timothy D. Wiser A proposed space mission would precisely measure deviations from Newtonian gravity on a scale of 100 astronomical units. [Phys. Rev. D 92, 104048] Published Tue Nov 24, 2015

Schlagwort(e): General Relativity and Gravitation

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Nonprojectable Horava-Lifshitz gravity without the unwanted scalar graviton (2015)

Masud Chaichian, Josef Klusoň, and Markku Oksanen

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Masud Chaichian, Josef Klusoň, and Markku Oksanen We consider a way of eliminating the unwanted scalar graviton from Horava-Lifshitz gravity that is achieved via introduction of certain additional constraints. We perform canonical analysis of both projectable and nonprojectable versions of the theory. We obtain the structure of constraints in each … [Phys. Rev. D 92, 104043] Published Mon Nov 23, 2015

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Third order solutions of cosmological density perturbations in Horndeski’s most general scalar-tensor theory with the Vainshtein mechanism (2015)

Yuichiro Takushima, Ayumu Terukina, and Kazuhiro Yamamoto

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-19

Beschreibung: Author(s): Yuichiro Takushima, Ayumu Terukina, and Kazuhiro Yamamoto We study the third order solutions of the cosmological density perturbations in Horndeski’s most general scalar-tensor theory under the condition that the Vainshtein mechanism is at work. In this work, we thoroughly investigate the independence property of the functions describing the nonlinear mode… [Phys. Rev. D 92, 104033] Published Tue Nov 17, 2015

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Slowly rotating black hole solutions in Horndeski gravity (2015)

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

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Andrea Maselli, Hector O. Silva, Masato Minamitsuji, and Emanuele Berti We study black hole solutions at first order in the Hartle-Thorne slow-rotation approximation in Horndeski gravity theories. We derive the equations of motion including also cases where the scalar depends linearly on time. In the Hartle-Thorne formalism, all first-order rotational corrections are de… [Phys. Rev. D 92, 104049] Published Wed Nov 25, 2015

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Gravitational wave afterglow in binary neutron star mergers (2015)

Daniela D. Doneva, Kostas D. Kokkotas, and Pantelis Pnigouras

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Daniela D. Doneva, Kostas D. Kokkotas, and Pantelis Pnigouras We study in detail the f -mode secular instability for rapidly rotating neutron stars, putting emphasis on supramassive models which do not have a stable nonrotating counterpart. Such neutron stars are thought to be the generic outcome of the merger of two standard-mass neutron stars. In addition, we… [Phys. Rev. D 92, 104040] Published Mon Nov 23, 2015

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Proper time method in de Sitter space (2015)

Ashok K. Das and Pushpa Kalauni

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Ashok K. Das and Pushpa Kalauni We use the proper time formalism to study a (non-self-interacting) massive Klein-Gordon theory in the two dimensional de Sitter space. We determine the exact Green’s function of the theory by solving the DeWitt-Schwinger equation as well as by calculating the operator matrix element. We point out ho… [Phys. Rev. D 92, 104037] Published Mon Nov 23, 2015

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Mass inflation and curvature divergence near the central singularity in spherical collapse (2015)

Jun-Qi Guo, Pankaj S. Joshi, and José T. Galvez Ghersi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Jun-Qi Guo, Pankaj S. Joshi, and José T. Galvez Ghersi We study spherical scalar collapse toward a black hole formation and examine the asymptotic dynamics near the central singularity of the formed black hole. It is found that, in the vicinity of the singularity, due to the strong backreaction of a scalar field on the geometry, the mass function inflat… [Phys. Rev. D 92, 104044] Published Mon Nov 23, 2015

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Thermodynamics of topological black holes in Brans-Dicke gravity with a power-law Maxwell field (2015)

M. Kord Zangeneh, M. H. Dehghani, and A. Sheykhi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-11-20

Beschreibung: Author(s): M. Kord Zangeneh, M. H. Dehghani, and A. Sheykhi In this paper, we present a new class of higher-dimensional exact topological black hole solutions of the Brans-Dicke theory in the presence of a power-law Maxwell field as the matter source. For this aim, we introduce a conformal transformation which transforms the Einstein-dilaton-power-law Maxwel… [Phys. Rev. D 92, 104035] Published Thu Nov 19, 2015

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Effects of the microphysical equation of state in the mergers of magnetized neutron stars with neutrino cooling (2015)

Carlos Palenzuela, Steven L. Liebling, David Neilsen, Luis Lehner, O. L. Caballero, Evan O’Connor, and Matthew Anderson

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-26

Beschreibung: Author(s): Carlos Palenzuela, Steven L. Liebling, David Neilsen, Luis Lehner, O. L. Caballero, Evan O’Connor, and Matthew Anderson We study the merger of binary neutron stars using different realistic, microphysical nuclear equations of state, as well as incorporating magnetic field and neutrino cooling effects. In particular, we concentrate on the influence of the equation of state on the gravitational wave signature and also … [Phys. Rev. D 92, 044045] Published Tue Aug 25, 2015

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Hamilton geometry: Phase space geometry from modified dispersion relations (2015)

Leonardo Barcaroli, Lukas K. Brunkhorst, Giulia Gubitosi, Niccoló Loret, and Christian Pfeifer

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-10-27

Beschreibung: Author(s): Leonardo Barcaroli, Lukas K. Brunkhorst, Giulia Gubitosi, Niccoló Loret, and Christian Pfeifer We describe the Hamilton geometry of the phase space of particles whose motion is characterized by general dispersion relations. In this framework spacetime and momentum space are naturally curved and intertwined, allowing for a simultaneous description of both spacetime curvature and nontrivial mom… [Phys. Rev. D 92, 084053] Published Mon Oct 26, 2015

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One-photon pair production on the expanding de Sitter spacetime (2015)

Robert Blaga

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In: Physical Review D

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Publikationsdatum: 2015-10-27

Beschreibung: Author(s): Robert Blaga We study the one-photon scalar pair production QED process on the expanding de Sitter spacetime. Using perturbation theory, we obtain the transition probability and study its properties as a function of the expansion parameter ω . On flat space the process is forbidden by energy-momentum conservation… [Phys. Rev. D 92, 084054] Published Mon Oct 26, 2015

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Charged Einstein-aether black holes and Smarr formula (2015)

Chikun Ding, Anzhong Wang, and Xinwen Wang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-10-27

Beschreibung: Author(s): Chikun Ding, Anzhong Wang, and Xinwen Wang In the framework of the Einstein-Maxwell-aether theory, we present two new classes of exact charged black hole solutions, which are asymptotically flat and possess the universal as well as Killing horizons. We also construct the Smarr formulas and calculate the temperatures of the horizons, using th… [Phys. Rev. D 92, 084055] Published Mon Oct 26, 2015

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Scattering from charged black holes and supergravity (2015)

Luís C. B. Crispino, Sam R. Dolan, Atsushi Higuchi, and Ednilton S. de Oliveira

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-10-27

Beschreibung: Author(s): Luís C. B. Crispino, Sam R. Dolan, Atsushi Higuchi, and Ednilton S. de Oliveira The scattering cross sections of the unpolarized electromagnetic and gravitational waves are shown to be equal for the extreme Reissner-Nordström black hole using N = 2 supergravity. The conversion cross sections between the unpolarized electromagnetic and gravitational waves are also shown to coincid… [Phys. Rev. D 92, 084056] Published Mon Oct 26, 2015

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Observer dependence of angular momentum in general relativity and its relationship to the gravitational-wave memory effect (2015)

Éanna É. Flanagan and David A. Nichols

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-10-27

Beschreibung: Author(s): Éanna É. Flanagan and David A. Nichols We define a procedure by which observers can measure a type of special-relativistic linear and angular momentum ( P a , J a b ) at a point in a curved spacetime using only the spacetime geometry in a neighborhood of that point. The method is chosen to yield the conventional results in stationary spacetimes… [Phys. Rev. D 92, 084057] Published Mon Oct 26, 2015

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New code for quasiequilibrium initial data of binary neutron stars: Corotating, irrotational, and slowly spinning systems (2015)

Antonios Tsokaros, Kōji Uryū, and Luciano Rezzolla

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): Antonios Tsokaros, Kōji Uryū, and Luciano Rezzolla We present the extension of our cocal —Compact Object CALculator—code to compute general-relativistic initial data for binary compact-star systems. In particular, we construct quasiequilibrium initial data for equal-mass binaries with spins that are either aligned or antialigned with the orbital angu... [Phys. Rev. D 91, 104030] Published Wed May 27, 2015

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Black strings in Gauss-Bonnet theory are unstable (2015)

Alex Giacomini, Julio Oliva, and Aldo Vera

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): Alex Giacomini, Julio Oliva, and Aldo Vera We report the existence of unstable s-wave modes for black strings in Gauss-Bonnet theory (which is quadratic in the curvature) in seven dimensions. This theory admits analytic uniform black strings that are, in the transverse section, black holes of the same Gauss-Bonnet theory in six dimensions. A... [Phys. Rev. D 91, 104033] Published Wed May 27, 2015

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Area terms in entanglement entropy (2015)

Horacio Casini, F. D. Mazzitelli, and Eduardo Testé

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): Horacio Casini, F. D. Mazzitelli, and Eduardo Testé We discuss area terms in entanglement entropy and show that a recent formula by Rosenhaus and Smolkin is equivalent to the term involving a correlator of traces of the stress tensor in the Adler-Zee formula for the renormalization of the Newton constant. We elaborate on how to fix the ambiguities in... [Phys. Rev. D 91, 104035] Published Wed May 27, 2015

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Effect of an arbitrary spin orientation on the quadrupolar structure of an extended body in a Schwarzschild spacetime (2015)

Donato Bini and Andrea Geralico

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): Donato Bini and Andrea Geralico The influence of an arbitrary spin orientation on the quadrupolar structure of an extended body moving in a Schwarzschild spacetime is investigated. The body dynamics is described by the Mathisson-Papapetrou-Dixon model, without any restriction on the motion or simplifying assumption on the associat... [Phys. Rev. D 91, 104036] Published Wed May 27, 2015

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Self-gravitating spherically symmetric solutions in scalar-torsion theories (2015)

Georgios Kofinas, Eleftherios Papantonopoulos, and Emmanuel N. Saridakis

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): Georgios Kofinas, Eleftherios Papantonopoulos, and Emmanuel N. Saridakis We study spherically symmetric solutions in scalar-torsion gravity theories in which a scalar field is coupled to torsion with a derivative coupling. We obtain the general field equations from which we extract a decoupled master equation, the solution of which leads to the specification of all other... [Phys. Rev. D 91, 104034] Published Wed May 27, 2015

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Crystal clear lessons on the microstructure of spacetime and modified gravity (2015)

Francisco S. N. Lobo, Gonzalo J. Olmo, and D. Rubiera-Garcia

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-02

Beschreibung: Author(s): Francisco S. N. Lobo, Gonzalo J. Olmo, and D. Rubiera-Garcia We argue that a microscopic structure for spacetime such as that expected in a quantum foam scenario, in which microscopic wormholes and other topological structures should play a relevant role, might lead to an effective metric-affine geometry at larger scales. This idea is supported by the role th... [Phys. Rev. D 91, 124001] Published Mon Jun 01, 2015

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Geometrical versus wave optics under gravitational waves (2015)

Raymond Angélil and Prasenjit Saha

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-02

Beschreibung: Author(s): Raymond Angélil and Prasenjit Saha We present some new derivations of the effect of a plane gravitational wave on a light ray. A simple interpretation of the results is that a gravitational wave causes a phase modulation of electromagnetic waves. We arrive at this picture from two contrasting directions, namely, null geodesics and Ma... [Phys. Rev. D 91, 124007] Published Mon Jun 01, 2015

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Approach of background metric expansion to a new metric ansatz for gauged and ungauged Kaluza-Klein supergravity black holes (2015)

Shuang-Qing Wu (吴双清) and He Wang (王赫)

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): Shuang-Qing Wu (吴双清) and He Wang (王赫) In a previous paper [S. Q. Wu, Phys. Rev. D 83 , 121502(R) (2011)], a new kind of metric ansatz was found to fairly describe all already-known black hole solutions in the ungauged Kaluza-Klein (KK) supergravity theories. That metric ansatz somewhat resembles the famous Kerr-Schild (KS) form, but it i... [Phys. Rev. D 91, 104031] Published Wed May 27, 2015

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Robinson-Trautman solution with scalar hair (2015)

T. Tahamtan and O. Svítek

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): T. Tahamtan and O. Svítek The explicit Robinson–Trautman solution with a minimally coupled free scalar field is derived and analyzed. It is shown that this solution contains curvature singularity, which is initially naked but later enveloped by the horizon. We use the quasilocal horizon definition and prove its existence in ... [Phys. Rev. D 91, 104032] Published Wed May 27, 2015

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Acoustic clouds: Standing sound waves around a black hole analogue (2015)

Carolina L. Benone, Luís C. B. Crispino, Carlos Herdeiro, and Eugen Radu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-30

Beschreibung: Author(s): Carolina L. Benone, Luís C. B. Crispino, Carlos Herdeiro, and Eugen Radu Under certain conditions sound waves in fluids experience an acoustic horizon with analogue properties to those of a black hole event horizon. In particular, a draining bathtub-like model can give rise to a rotating acoustic horizon and hence a rotating black hole (acoustic) analogue. We show that s... [Phys. Rev. D 91, 104038] Published Fri May 29, 2015

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Entropy formula of black holes in minimal massive gravity and its application for BTZ black holes (2015)

M. R. Setare and H. Adami

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-30

Beschreibung: Author(s): M. R. Setare and H. Adami In this paper we obtain the entropy formula of black hole solutions of minimal massive gravity (MMG) by the Tachikawa method [1]. Then we apply this formula for the Bañados-Teitelboim-Zanelli black hole solution. We find that the usual Bekenstein-Hawking entropy is modified. The modification comes f... [Phys. Rev. D 91, 104039] Published Fri May 29, 2015

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Smooth bounce in the affine quantization of a Bianchi I model (2015)

Hervé Bergeron, Andrea Dapor, Jean Pierre Gazeau, and Przemysław Małkiewicz

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-02

Beschreibung: Author(s): Hervé Bergeron, Andrea Dapor, Jean Pierre Gazeau, and Przemysław Małkiewicz We present the affine coherent state quantization of the Bianchi I model. As in our previous paper on quantum theory of Friedmann models, we employ a variable associated with a perfect fluid to play a role of clock. Then we deparametrize the model. A distinctive feature, absent in isotropic models, ... [Phys. Rev. D 91, 124002] Published Mon Jun 01, 2015

Schlagwort(e): General Relativity and Gravitation

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Spherically symmetric canonical quantum gravity (2015)

Suddhasattwa Brahma

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-02

Beschreibung: Author(s): Suddhasattwa Brahma Canonical quantization of spherically symmetric space-times is carried out, using real-valued densitized triads and extrinsic curvature components, with specific factor-ordering choices ensuring in an anomaly free quantum constraint algebra. Comparison with previous work [ Nucl. Phys. B399 , 211 (1993... [Phys. Rev. D 91, 124003] Published Mon Jun 01, 2015

Schlagwort(e): General Relativity and Gravitation

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Braneworld solutions for modified theories of gravity with nonconstant curvature (2015)

D. Bazeia, A. S. Lobão, Jr., L. Losano, R. Menezes, and Gonzalo J. Olmo

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-02

Beschreibung: Author(s): D. Bazeia, A. S. Lobão, Jr., L. Losano, R. Menezes, and Gonzalo J. Olmo We study braneworld models in the presence of scalar field in a five-dimensional geometry with a single extra dimension of infinite extent, with gravity modified to include a function of the Ricci scalar. We develop a procedure that allows us to obtain an analytical solution for the braneworld confi... [Phys. Rev. D 91, 124006] Published Mon Jun 01, 2015

Schlagwort(e): General Relativity and Gravitation

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Gravitomagnetic response of an irrotational body to an applied tidal field (2015)

Philippe Landry and Eric Poisson

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-27

Beschreibung: Author(s): Philippe Landry and Eric Poisson The deformation of a nonrotating body resulting from the application of a tidal field is measured by two sets of Love numbers associated with the gravitoelectric and gravitomagnetic pieces of the tidal field, respectively. The gravitomagnetic Love numbers were previously computed for fluid bodies un... [Phys. Rev. D 91, 104026] Published Thu May 21, 2015

Schlagwort(e): General Relativity and Gravitation

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Pragmatic mode-sum regularization method for semiclassical black-hole spacetimes (2015)

Adam Levi and Amos Ori

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-27

Beschreibung: Author(s): Adam Levi and Amos Ori Computation of the renormalized stress-energy tensor is the most serious obstacle in studying the dynamical, self-consistent, semiclassical evaporation of a black hole in 4D. The difficulty arises from the delicate regularization procedure for the stress-energy tensor, combined with the fact that in... [Phys. Rev. D 91, 104028] Published Tue May 26, 2015

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Entropy of a self-gravitating electrically charged thin shell and the black hole limit (2015)

José P. S. Lemos, Gonçalo M. Quinta, and Oleg B. Zaslavskii

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): José P. S. Lemos, Gonçalo M. Quinta, and Oleg B. Zaslavskii A static self-gravitating electrically charged spherical thin shell embedded in a ( 3 + 1 )-dimensional spacetime is used to study the thermodynamic and entropic properties of the corresponding spacetime. Inside the shell, the spacetime is flat, whereas outside it is a Reissner-Nordström spacetime, and ... [Phys. Rev. D 91, 104027] Published Thu May 21, 2015

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Time travel in transformation optics: Metamaterials with closed null geodesics (2015)

S. Reece Boston

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-12

Beschreibung: Author(s): S. Reece Boston We apply the methods of transformation optics to theoretical descriptions of spacetimes that support closed null geodesic curves. The metric used is based on frame dragging spacetimes, such as the van Stockum dust or the Kerr black hole. Through transformation optics, this metric is analogous to a m... [Phys. Rev. D 91, 124035] Published Thu Jun 11, 2015

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Towards the Cardy formula for hyperscaling violation black holes (2015)

Moisés Bravo-Gaete, Sebastián Gómez, and Mokhtar Hassaïne

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-12

Beschreibung: Author(s): Moisés Bravo-Gaete, Sebastián Gómez, and Mokhtar Hassaïne The aim of this paper is to propose a generalized Cardy formula for three-dimensional hyperscaling violation black holes. We first note that for the hyperscaling violation metrics, the scaling of the entropy in terms of the temperature (defined as the effective spatial dimensionality divided by the ... [Phys. Rev. D 91, 124038] Published Thu Jun 11, 2015

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Numerical relativity simulations of neutron star merger remnants using conservative mesh refinement (2015)

Tim Dietrich, Sebastiano Bernuzzi, Maximiliano Ujevic, and Bernd Brügmann

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-13

Beschreibung: Author(s): Tim Dietrich, Sebastiano Bernuzzi, Maximiliano Ujevic, and Bernd Brügmann We study equal- and unequal-mass neutron star mergers by means of new numerical relativity simulations in which the general relativistic hydrodynamics solver employs an algorithm that guarantees mass conservation across the refinement levels of the computational mesh. We consider eight binary config... [Phys. Rev. D 91, 124041] Published Fri Jun 12, 2015

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Measuring the black hole spin direction in 3D Cartesian numerical relativity simulations (2015)

Vassilios Mewes, José A. Font, and Pedro J. Montero

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-13

Beschreibung: Author(s): Vassilios Mewes, José A. Font, and Pedro J. Montero We show that the so-called flat-space rotational Killing vector method for measuring the Cartesian components of a black hole spin can be derived from the surface integral of Weinberg’s pseudotensor over the apparent horizon surface when using Gaussian normal coordinates in the integration. Moreover... [Phys. Rev. D 91, 124043] Published Fri Jun 12, 2015

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Morris-Thorne wormholes in static pseudospherically symmetric spacetimes (2015)

Mauricio Cataldo, Luis Liempi, and Pablo Rodríguez

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-13

Beschreibung: Author(s): Mauricio Cataldo, Luis Liempi, and Pablo Rodríguez In this paper, we study classical general relativistic static wormhole configurations with pseudospherical symmetry. We show that, in addition to the hyperbolic wormhole solutions discussed by Lobo and Mimoso in [ Phys. Rev. D 82 , 044034 (2010)], there exists another wormhole class, which is a truly ... [Phys. Rev. D 91, 124039] Published Fri Jun 12, 2015

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Template-space metric for searches for gravitational waves from the inspiral, merger, and ringdown of binary black holes (2015)

Chinmay Kalaghatgi, Parameswaran Ajith, and K. G. Arun

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Chinmay Kalaghatgi, Parameswaran Ajith, and K. G. Arun Searches for gravitational waves (GWs) from binary black holes using interferometric GW detectors require the construction of template banks for performing matched filtering while analyzing the data. Placement of templates over the parameter space of binaries, as well as coincidence tests of GW trig... [Phys. Rev. D 91, 124042] Published Fri Jun 12, 2015

Schlagwort(e): General Relativity and Gravitation

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Transition redshift in f(T) cosmology and observational constraints (2015)

Salvatore Capozziello, Orlando Luongo, and Emmanuel N. Saridakis

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-13

Beschreibung: Author(s): Salvatore Capozziello, Orlando Luongo, and Emmanuel N. Saridakis We extract constraints on the transition redshift z tr , determining the onset of cosmic acceleration, predicted by an effective cosmographic construction, in the framework of f ( T ) gravity. In particular, employing cosmography we obtain bounds on the viable f ( T ) forms and their derivatives. Since this... [Phys. Rev. D 91, 124037] Published Thu Jun 11, 2015

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Post-merger evolution of a neutron star-black hole binary with neutrino transport (2015)

Francois Foucart, Evan O’Connor, Luke Roberts, Matthew D. Duez, Roland Haas, Lawrence E. Kidder, Christian D. Ott, Harald P. Pfeiffer, Mark A. Scheel, and Bela Szilagyi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-13

Beschreibung: Author(s): Francois Foucart, Evan O’Connor, Luke Roberts, Matthew D. Duez, Roland Haas, Lawrence E. Kidder, Christian D. Ott, Harald P. Pfeiffer, Mark A. Scheel, and Bela Szilagyi We present a first simulation of the post-merger evolution of a black hole-neutron star binary in full general relativity using an energy-integrated general-relativistic truncated moment formalism for neutrino transport. We describe our implementation of the moment formalism and important tests of o... [Phys. Rev. D 91, 124021] Published Thu Jun 11, 2015

Schlagwort(e): General Relativity and Gravitation

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Fisher versus Bayes: A comparison of parameter estimation techniques for massive black hole binaries to high redshifts with eLISA (2015)

Edward K. Porter and Neil J. Cornish

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-06

Beschreibung: Author(s): Edward K. Porter and Neil J. Cornish Massive black hole binaries are the primary source of gravitational waves (GWs) for the future eLISA observatory. The detection and parameter estimation of these sources to high redshift would provide invaluable information on the formation mechanisms of seed black holes, and on the evolution of mas... [Phys. Rev. D 91, 104001] Published Tue May 05, 2015

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Calabi-Yau manifolds from noncommutative Hermitian U(1) instantons (2015)

Hyun Seok Yang

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Hyun Seok Yang We show that Calabi-Yau manifolds are emergent from the commutative limit of six-dimensional noncommutative Hermitian U ( 1 ) instantons. Therefore, we argue that the noncommutative Hermitian U ( 1 ) instantons correspond to quantized Calabi-Yau manifolds. [Phys. Rev. D 91, 104002] Published Tue May 05, 2015

Schlagwort(e): General Relativity and Gravitation

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Equation of state of dark energy in f(R) gravity (2015)

Kazufumi Takahashi and Jun’ichi Yokoyama

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-06

Beschreibung: Author(s): Kazufumi Takahashi and Jun’ichi Yokoyama f ( R ) gravity is one of the simplest generalizations of general relativity, which may explain the accelerated cosmic expansion without introducing a cosmological constant. Transformed into the Einstein frame, a new scalar degree of freedom appears and it couples with matter fields. In order for f ( R ) ... [Phys. Rev. D 91, 084060] Published Thu Apr 30, 2015

Schlagwort(e): General Relativity and Gravitation

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Quantitative analysis of singular inflation with scalar-tensor and modified gravity (2015)

S. Nojiri, S. D. Odintsov, and V. K. Oikonomou

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): S. Nojiri, S. D. Odintsov, and V. K. Oikonomou We provide a detailed quantitative description of singular inflation. Its close analogy with finite-time future singularity which is associated to dark energy era is described. Calling and classifying the singularities of such inflation as finite time cosmological singularities we investigate their ... [Phys. Rev. D 91, 084059] Published Thu Apr 30, 2015

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Multiparticle systems in κ-Poincaré inspired by (2+1)D gravity (2015)

Jerzy Kowalski-Glikman and Giacomo Rosati

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Jerzy Kowalski-Glikman and Giacomo Rosati Inspired by a Chern-Simons description of 2 + 1 -dimensional gravity coupled to point particles we propose a new Lagrangian of a multiparticle system living in κ -Minkowski/ κ -Poincaré spacetime. We derive the dynamics of interacting particles with κ -momentum space, alternative to the one proposed in the... [Phys. Rev. D 91, 084061] Published Thu Apr 30, 2015

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Post-Newtonian constraints on Lorentz-violating gravity theories with a MOND phenomenology (2015)

Matteo Bonetti and Enrico Barausse

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Matteo Bonetti and Enrico Barausse We study the post-Newtonian expansion of a class of Lorentz-violating gravity theories that reduce to khronometric theory (i.e. the infrared limit of Hořava gravity) in high-acceleration regimes and reproduce the phenomenology of modified Newtonian dynamics (MOND) in the low-acceleration, nonrelativ... [Phys. Rev. D 91, 084053] Published Fri Apr 24, 2015

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Constraining the solution to the last parsec problem with pulsar timing (2015)

Laura Sampson, Neil J. Cornish, and Sean T. McWilliams

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Laura Sampson, Neil J. Cornish, and Sean T. McWilliams The detection of a stochastic gravitational-wave signal from the superposition of many inspiraling supermassive black holes with pulsar timing arrays (PTAs) is likely to occur within the next decade. With this detection will come the opportunity to learn about the processes that drive black-hole-bin... [Phys. Rev. D 91, 084055] Published Fri Apr 24, 2015

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Cosmological implications of bumblebee vector models (2015)

Diogo Capelo and Jorge Páramos

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-13

Beschreibung: Author(s): Diogo Capelo and Jorge Páramos The bumblebee model of spontaneous Lorentz symmetry breaking is explored in a cosmological context, considering a single nonzero time component for the vector field. The relevant dynamic equations for the evolution of the Universe are derived and their properties and physical significance are studie... [Phys. Rev. D 91, 104007] Published Mon May 11, 2015

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New definition of a wormhole throat (2015)

Yoshimune Tomikawa, Keisuke Izumi, and Tetsuya Shiromizu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-05-13

Beschreibung: Author(s): Yoshimune Tomikawa, Keisuke Izumi, and Tetsuya Shiromizu We present a new definition of the wormhole throat including the flare-out condition and the feature corresponding to the traversability for general dynamical spacetimes in terms of null geodesic congruences. We will examine our definition for some examples and see advantages compared to the others. [Phys. Rev. D 91, 104008] Published Mon May 11, 2015

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