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[Editors' Choice] Carboxylating stubborn alkyl chlorides (2016)

Phil Szuromi

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-07-08

Beschreibung: Author: Phil Szuromi

Schlagwort(e): Organic Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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[This Week in Science] Olefins enlisted to attack ketones (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-07-08

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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[This Week in Science] A radical route to ophiobolin rings (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-05-27

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

Print ISSN: 0036-8075

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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[This Week in Science] A light approach to C-N bond formation (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-07-15

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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[Editors' Choice] Iron takes alcohols to carboxylic acids (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-07-22

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Astrophysical applications of the post-Tolman-Oppenheimer-Volkoff formalism (2016)

Kostas Glampedakis, George Pappas, Hector O. Silva, and Emanuele Berti

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-13

Beschreibung: Author(s): Kostas Glampedakis, George Pappas, Hector O. Silva, and Emanuele Berti In this paper, a previously developed formalism, where all possible deviations, due to modified gravity from the structure of compact stars in general relativity, have been classified in a parametrized phenomenological form, has been used to deal with the stellar exterior. Several potential astrophysical observables, e.g. the surface redshift, have been computed for future use. [Phys. Rev. D 94, 044030] Published Fri Aug 12, 2016

Schlagwort(e): General relativity, alternative theories of gravity

Print ISSN: 0556-2821

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Thema: Physik

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Fake conformal symmetry in unimodular gravity (2016)

Ichiro Oda

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-18

Beschreibung: Author(s): Ichiro Oda We study Weyl symmetry (local conformal symmetry) in unimodular gravity. It is shown that the Noether currents for both Weyl symmetry and global scale symmetry vanish exactly as in conformally invariant scalar-tensor gravity. We clearly explain why in the class of conformally invariant gravitational… [Phys. Rev. D 94, 044032] Published Wed Aug 17, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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8

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Static spherically symmetric Kerr-Schild metrics and implications for the classical double copy (2016)

Alexander K. Ridgway and Mark B. Wise

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-12

Beschreibung: Author(s): Alexander K. Ridgway and Mark B. Wise We discuss the physical interpretation of stress-energy tensors that source static spherically symmetric Kerr-Schild metrics. We find that the sources of such metrics with no curvature singularities or horizons do not simultaneously satisfy the weak and strong energy conditions. Sensible stress-ener… [Phys. Rev. D 94, 044023] Published Thu Aug 11, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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9

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Effective gravitational couplings for cosmological perturbations in generalized Proca theories (2016)

Antonio De Felice, Lavinia Heisenberg, Ryotaro Kase, Shinji Mukohyama, Shinji Tsujikawa, and Ying-li Zhang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-12

Beschreibung: Author(s): Antonio De Felice, Lavinia Heisenberg, Ryotaro Kase, Shinji Mukohyama, Shinji Tsujikawa, and Ying-li Zhang We consider the finite interactions of the generalized Proca theory including the sixth-order Lagrangian and derive the full linear perturbation equations of motion on the flat Friedmann-Lemaître-Robertson-Walker background in the presence of a matter perfect fluid. By construction, the propagating … [Phys. Rev. D 94, 044024] Published Thu Aug 11, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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10

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Gravitational self-force on eccentric equatorial orbits around a Kerr black hole (2016)

Maarten van de Meent

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-20

Beschreibung: Author(s): Maarten van de Meent This paper presents the first calculation of the gravitational self-force on a small compact object on an eccentric equatorial orbit around a Kerr black hole to first order in the mass ratio. That is the pointwise correction to the object’s equations of motion (both conservative and dissipative) due… [Phys. Rev. D 94, 044034] Published Fri Aug 19, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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11

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Vacuum and gravitons of relic gravitational waves and the regularization of the spectrum and energy-momentum tensor (2016)

Dong-Gang Wang, Yang Zhang, and Jie-Wen Chen

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-20

Beschreibung: Author(s): Dong-Gang Wang, Yang Zhang, and Jie-Wen Chen The spectrum of a relic gravitational wave (RGW) contains high-frequency divergences, which should be removed. We present a systematic study of the issue, based on the exact RGW solution that covers the five stages, from inflation to the acceleration, each being a power law expansion. We show that t… [Phys. Rev. D 94, 044033] Published Thu Aug 18, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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12

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Ernst formulation of axisymmetric fields in f(R) gravity: Applications to neutron stars and gravitational waves (2016)

Arthur George Suvorov and Andrew Melatos

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): Arthur George Suvorov and Andrew Melatos The Ernst formulation of the Einstein equations is generalized to accommodate f ( R ) theories of gravity. It is shown that, as in general relativity, the axisymmetric f ( R ) field equations for a vacuum spacetime that is either stationary or cylindrically symmetric reduce to a single, nonlinear differen… [Phys. Rev. D 94, 044045] Published Tue Aug 23, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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13

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Analytic treatment of the system of a Kerr-Newman black hole and a charged massive scalar field (2016)

Shahar Hod

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): Shahar Hod Charged rotating Kerr-Newman black holes are known to be superradiantly unstable to perturbations of charged massive bosonic fields whose proper frequencies lie in the bounded regime 0 〈 ω 〈 min { ω c ≡ m Ω H + q Φ H , μ } , where { Ω H , Φ H } are, respectively, the angular velocity and electric potential of the Kerr… [Phys. Rev. D 94, 044036] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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14

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Cosmological wormholes in f(R) theories of gravity (2016)

Sebastian Bahamonde, Mubasher Jamil, Petar Pavlovic, and Marko Sossich

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): Sebastian Bahamonde, Mubasher Jamil, Petar Pavlovic, and Marko Sossich Motivated by recent proposals of possible wormhole existence in galactic halos, we analyze the cosmological evolution of wormhole solutions in modified f ( R ) gravity. We construct a dynamical wormhole that asymptotically approaches a Friedmann-Lemaître-Robertson-Walker (FLRW) universe, with supportin… [Phys. Rev. D 94, 044041] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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15

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Gravitational wave asteroseismology with protoneutron stars (2016)

Hajime Sotani and Tomoya Takiwaki

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): Hajime Sotani and Tomoya Takiwaki We examine the time evolution of the frequencies of the gravitational wave after the bounce within the framework of relativistic linear perturbation theory using the results of one-dimensional numerical simulations of core-collapse supernovae. Protoneutron star models are constructed in such a way t… [Phys. Rev. D 94, 044043] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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16

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Stable photon orbits in stationary axisymmetric electrovacuum spacetimes (2016)

Sam R. Dolan and Jake O. Shipley

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): Sam R. Dolan and Jake O. Shipley We investigate the existence and phenomenology of stable photon orbits (SPOs) in stationary axisymmetric electrovacuum spacetimes in four dimensions. First, we review the classification of equatorial circular photon orbits on Kerr-Newman spacetimes in the charge-spin plane. Second, using a Hamiltoni… [Phys. Rev. D 94, 044038] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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17

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Supersymmetric black lenses in five dimensions (2016)

Shinya Tomizawa and Masato Nozawa

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): Shinya Tomizawa and Masato Nozawa We present an asymptotically flat supersymmetric black lens solution with the horizon topology L ( n , 1 ) = S 3 / Z n in the five-dimensional minimal ungauged supergravity. We show that the black lens carries a mass, two independent angular momenta, electric charge, and ( n − 1 ) magnetic fluxes, among which only… [Phys. Rev. D 94, 044037] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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18

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From smooth curves to universal metrics (2016)

Metin Gürses, Tahsin Çağrı Şişman, and Bayram Tekin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): Metin Gürses, Tahsin Çağrı Şişman, and Bayram Tekin A special class of metrics, called universal metrics, solves all gravity theories defined by covariant field equations purely based on the metric tensor. Since we currently lack the knowledge of what the full quantum-corrected field equations of gravity are at a given microscopic length scale, these… [Phys. Rev. D 94, 044042] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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19

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Chameleon dark energy and atom interferometry (2016)

Benjamin Elder, Justin Khoury, Philipp Haslinger, Matt Jaffe, Holger Müller, and Paul Hamilton

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-26

Beschreibung: Author(s): Benjamin Elder, Justin Khoury, Philipp Haslinger, Matt Jaffe, Holger Müller, and Paul Hamilton Atom interferometry experiments are searching for evidence of chameleon scalar fields with ever-increasing precision. As experiments become more precise, so too must theoretical predictions. Previous work has made numerous approximations to simplify the calculation, which in general requires solving… [Phys. Rev. D 94, 044051] Published Thu Aug 25, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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20

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Solitons and hairy black holes in Einstein–non-Abelian–Proca theory in anti–de Sitter spacetime (2016)

Supakchai Ponglertsakul and Elizabeth Winstanley

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-26

Beschreibung: Author(s): Supakchai Ponglertsakul and Elizabeth Winstanley We present new soliton and hairy black hole solutions of Einstein–non-Abelian–Proca theory in asymptotically anti–de Sitter spacetime with gauge group su ( 2 ) . For static, spherically symmetric configurations, we show that the gauge field must be purely magnetic, and we solve the resulting field equat… [Phys. Rev. D 94, 044048] Published Wed Aug 24, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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21

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Correspondence between sonic points of ideal photon gas accretion and photon spheres (2016)

Yasutaka Koga and Tomohiro Harada

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-27

Beschreibung: Author(s): Yasutaka Koga and Tomohiro Harada In the accretion flow of a fluid, its velocity may transit from subsonic to supersonic. The point at which such a transition occurs is called the sonic point and is often mathematically special. We consider the steady-state and spherically symmetric accretion problem of an ideal photon gas in genera… [Phys. Rev. D 94, 044053] Published Fri Aug 26, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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Mode-sum regularization of ⟨ϕ^{2} ⟩ in the angular-splitting method (2016)

Adam Levi and Amos Ori

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-27

Beschreibung: Author(s): Adam Levi and Amos Ori The computation of the renormalized stress-energy tensor or ⟨ ϕ 2 ⟩ ren in curved spacetime is a challenging task, at both the conceptual and technical levels. Recently we developed a new approach to compute such renormalized quantities in asymptotically flat curved spacetimes, based on the point-splitt… [Phys. Rev. D 94, 044054] Published Fri Aug 26, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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Information retrieval from black holes (2016)

Kinjalk Lochan, Sumanta Chakraborty, and T. Padmanabhan

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-27

Beschreibung: Author(s): Kinjalk Lochan, Sumanta Chakraborty, and T. Padmanabhan It is generally believed that, when matter collapses to form a black hole, the complete information about the initial state of the matter cannot be retrieved by future asymptotic observers, through local measurements. This is contrary to the expectation from a unitary evolution in quantum theory and… [Phys. Rev. D 94, 044056] Published Fri Aug 26, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Strong-field tidal distortions of rotating black holes. II. Horizon dynamics from eccentric and inclined orbits (2016)

Stephen O’Sullivan and Scott A. Hughes

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-30

Beschreibung: Author(s): Stephen O’Sullivan and Scott A. Hughes In a previous paper, we developed tools for studying the horizon geometry of a Kerr black hole that is tidally distorted by a binary companion using techniques that require large mass ratios but can be applied to any bound orbit and allow for arbitrary black hole spin. We now apply these tools to ge… [Phys. Rev. D 94, 044057] Published Mon Aug 29, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Dynamical formation of a Reissner-Nordström black hole with scalar hair in a cavity (2016)

Nicolas Sanchis-Gual, Juan Carlos Degollado, Carlos Herdeiro, José A. Font, and Pedro J. Montero

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-31

Beschreibung: Author(s): Nicolas Sanchis-Gual, Juan Carlos Degollado, Carlos Herdeiro, José A. Font, and Pedro J. Montero In a recent Letter [Sanchis-Gual et al. , Phys. Rev. Lett. 116 , 141101 (2016)], we presented numerical relativity simulations, solving the full Einstein–Maxwell–Klein-Gordon equations, of superradiantly unstable Reissner-Nordström black holes (BHs), enclosed in a cavity. Low frequency, spherical pert… [Phys. Rev. D 94, 044061] Published Tue Aug 30, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Thema: Physik

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[This Week in Science] Catalysis gets all tied up in knots (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-06-24

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

Publiziert von American Association for the Advancement of Science (AAAS)

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[This Week in Science] Adding two fluorines to just one carbon (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-07-01

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

Publiziert von American Association for the Advancement of Science (AAAS)

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Quantum cosmology near two dimensions (2016)

Teresa Bautista and Atish Dabholkar

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-11

Beschreibung: Author(s): Teresa Bautista and Atish Dabholkar We consider a Weyl-invariant formulation of gravity with a cosmological constant in d -dimensional spacetime and show that near two dimensions the classical action reduces to the timelike Liouville action. We show that the renormalized cosmological term leads to a nonlocal quantum momentum tensor whi… [Phys. Rev. D 94, 044017] Published Wed Aug 10, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Post-Newtonian celestial mechanics in scalar-tensor cosmology (2016)

Andrei Galiautdinov and Sergei M. Kopeikin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-11

Beschreibung: Author(s): Andrei Galiautdinov and Sergei M. Kopeikin Applying the recently developed dynamical perturbation formalism on cosmological background to scalar-tensor theory, we provide a solid theoretical basis and a rigorous justification for phenomenological models of orbital dynamics that are currently used to interpret experimental measurements of the… [Phys. Rev. D 94, 044015] Published Wed Aug 10, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Internal composition of proto-neutron stars under strong magnetic fields (2016)

B. Franzon, V. Dexheimer, and S. Schramm

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-11

Beschreibung: Author(s): B. Franzon, V. Dexheimer, and S. Schramm In this work, we study the effects of magnetic fields and rotation on the structure and composition of proto-neutron stars. A hadronic chiral SU(3) model is applied to cold neutron stars and proto-neutron stars with trapped neutrinos and at fixed entropy per baryon. We obtain general relativistic so… [Phys. Rev. D 94, 044018] Published Wed Aug 10, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Asymptotic Reissner-Nordström solution within nonlinear electrodynamics (2016)

S. I. Kruglov

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-13

Beschreibung: Author(s): S. I. Kruglov A model of nonlinear electrodynamics coupled with the gravitational field is studied. We obtain the asymptotic black hole solutions at r → 0 and r → ∞ . The asymptotic at r → 0 is shown, and we find corrections to the Reissner-Nordström solution and Coulomb’s law at r → ∞ . The mass of the black hole is evalu… [Phys. Rev. D 94, 044026] Published Fri Aug 12, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Constraints on primordial black holes from the Galactic gamma-ray background (2016)

B. J. Carr, Kazunori Kohri, Yuuiti Sendouda, and Jun’ichi Yokoyama

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-13

Beschreibung: Author(s): B. J. Carr, Kazunori Kohri, Yuuiti Sendouda, and Jun’ichi Yokoyama The fraction of the Universe going into primordial black holes (PBHs) with initial mass M * ≈ 5 × 1 0 14 g , such that they are evaporating at the present epoch, is strongly constrained by observations of both the extragalactic and Galactic γ -ray backgrounds. However, while the dominant contribution to the… [Phys. Rev. D 94, 044029] Published Fri Aug 12, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Wave equations on the linear mass Vaidya metric (2016)

Saeede Nafooshe and Martin O’Loughlin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): Saeede Nafooshe and Martin O’Loughlin We discuss the near-singularity region of the linear mass Vaidya metric. In particular, we investigate the structure in the numerical solutions for the scattering of scalar and electromagnetic metric perturbations from the singularity. We observe that, around the total evaporation point, quasinormal… [Phys. Rev. D 94, 044035] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Modeling Kleinian cosmology with electronic metamaterials (2016)

David Figueiredo, Felipe A. Gomes, Sébastien Fumeron, Bertrand Berche, and Fernando Moraes

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): David Figueiredo, Felipe A. Gomes, Sébastien Fumeron, Bertrand Berche, and Fernando Moraes This paper deals with the propagation of Klein-Gordon particles in flat background spacetime exhibiting discontinuous metric changes from a Lorentzian signature ( − , + , + , + ) to a Kleinian signature ( − , + , + , − ) . A formal analogy with the propagation of electrons at a junction between an anisotropic semico… [Phys. Rev. D 94, 044039] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Chern-Simons modified gravity and closed timelike curves (2016)

P. J. Porfírio, J. B. Fonseca-Neto, J. R. Nascimento, A. Yu. Petrov, J. Ricardo, and A. F. Santos

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-24

Beschreibung: Author(s): P. J. Porfírio, J. B. Fonseca-Neto, J. R. Nascimento, A. Yu. Petrov, J. Ricardo, and A. F. Santos We verify the consistency of the Gödel-type solutions within the four-dimensional Chern-Simons modified gravity with the nondynamical Chern-Simons coefficient for different forms of matter including dust, fluid, scalar field, and electromagnetic field and discuss the related causality issues. We sho… [Phys. Rev. D 94, 044044] Published Mon Aug 22, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Initial-data contribution to the error budget of gravitational waves from neutron-star binaries (2016)

Antonios Tsokaros, Bruno C. Mundim, Filippo Galeazzi, Luciano Rezzolla, and Kōji Uryū

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-26

Beschreibung: Author(s): Antonios Tsokaros, Bruno C. Mundim, Filippo Galeazzi, Luciano Rezzolla, and Kōji Uryū As numerical calculations of inspiraling neutron-star binaries reach values of accuracy that are comparable with those of black-hole binaries, a fine budgeting of the various sources of error becomes increasingly important. Among such sources, the initial data are normally not accounted for, the rat… [Phys. Rev. D 94, 044049] Published Thu Aug 25, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Spin-3/2 fields in D-dimensional Schwarzschild black hole spacetimes (2016)

C.-H. Chen, H. T. Cho, A. S. Cornell, and G. Harmsen

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-26

Beschreibung: Author(s): C.-H. Chen, H. T. Cho, A. S. Cornell, and G. Harmsen In previous works we have studied spin- 3 / 2 fields near four-dimensional Schwarzschild black holes. The techniques we developed in that case have now been extended here to show that it is possible to determine the potential of spin- 3 / 2 fields near D -dimensional black holes by exploiting the radial sy… [Phys. Rev. D 94, 044052] Published Thu Aug 25, 2016

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Finite energy quantization on a topology changing spacetime (2016)

S. Krasnikov

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-27

Beschreibung: Author(s): S. Krasnikov The “trousers” spacetime is a pair of flat two-dimensional cylinders (“legs”) merging into a single one (“trunk”). In spite of its simplicity this spacetime has a few features (including, in particular, a naked singularity in the “crotch”) each of which is presumably unphysical, but for none of whic… [Phys. Rev. D 94, 044055] Published Fri Aug 26, 2016

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[Perspective] Three catalysts for activating carbon-hydrogen bonds (2016)

Corinne Fruit

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-06-10

Beschreibung: Transition metal–catalyzed arylation of C–H bonds has been intensively studied for forming C–C bonds in complex-molecule synthesis (1). An acidic C–H bond (for example, one near a double bond or an O atom) is cleaved to form a carbon–metal bond, which then couples to arene. Many of these organometallic species can be generated catalytically. Much less research has dealt with unreactive nonacidic sp3 C–H bond functionalization (3). On page 1304 of this issue, Shaw et al. (3) report an efficient and general method that focuses on arylation of sp3 C–H bonds at carbon atoms adjacent to amines and to cyclic ethers by combining nickel, visible-light photoredox, and hydrogen-atom transfer (HAT) catalysis. Author: Corinne Fruit

Schlagwort(e): Organic Chemistry

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[This Week in Science] A tip of the HAT to C-C bond formation (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-06-10

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

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The imprint of the analogue Hawking effect in subcritical flows (2016)

Antonin Coutant and Silke Weinfurtner

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-10

Beschreibung: Author(s): Antonin Coutant and Silke Weinfurtner We study the propagation of low-frequency shallow water waves on a one-dimensional flow of varying depth. When taking into account dispersive effects, the linear propagation of long-wavelength modes on uneven bottoms excites new solutions of the dispersion relation which possess a much shorter wavel… [Phys. Rev. D 94, 064026] Published Fri Sep 09, 2016

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[This Week in Science] A rhodium route from C-H to C-N bonds (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-09-09

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Takahisa Igata, Tsuyoshi Houri, and Tomohiro Harada

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-13

Beschreibung: Author(s): Takahisa Igata, Tsuyoshi Houri, and Tomohiro Harada We study the self-similar motion of a string in a self-similar spacetime by introducing the concept of a self-similar string, which is defined as the world sheet to which a homothetic vector field is tangent. It is shown that in Nambu-Goto theory, the equations of motion for a self-similar string re… [Phys. Rev. D 94, 064029] Published Mon Sep 12, 2016

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Hawking-like radiation and the density matrix for an infalling observer during gravitational collapse (2016)

Anshul Saini and Dejan Stojkovic

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-13

Beschreibung: Author(s): Anshul Saini and Dejan Stojkovic We study time-dependent Hawking-like radiation as seen by an infalling observer during gravitational collapse of a thin shell. We calculate the occupation number of particles of which the frequencies are measured in the proper time of an infalling observer in Eddington-Finkelstein coordinates. We so… [Phys. Rev. D 94, 064028] Published Mon Sep 12, 2016

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Lorentzian proper vertex amplitude: Asymptotics (2016)

Jonathan Engle, Ilya Vilensky, and Antonia Zipfel

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-13

Beschreibung: Author(s): Jonathan Engle, Ilya Vilensky, and Antonia Zipfel In previous work, the Lorentzian proper vertex amplitude for a spin-foam model of quantum gravity was derived. In the present work, the asymptotics of this amplitude are studied in the semiclassical limit. The starting point of the analysis is an expression for the amplitude as an action integral wi… [Phys. Rev. D 94, 064025] Published Fri Sep 09, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Dynamical analysis of generalized f(R,L) theories (2016)

R. P. L. Azevedo and J. Páramos

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-14

Beschreibung: Author(s): R. P. L. Azevedo and J. Páramos In this work, we use a dynamical system approach to analyze the viability of f ( R , L ) candidates for dark energy. We compare these with nonminimal coupled f ( R ) theories and study the solutions for exponential and power-law forms in order to constrain the allowed range of model parameters. [Phys. Rev. D 94, 064036] Published Tue Sep 13, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Gravitational wave memory in de Sitter spacetime (2016)

Lydia Bieri, David Garfinkle, and Shing-Tung Yau

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-17

Beschreibung: Author(s): Lydia Bieri, David Garfinkle, and Shing-Tung Yau We examine gravitational wave memory in the case where sources and detector are in an expanding cosmology. For simplicity, we treat the case where the cosmology is de Sitter spacetime, and discuss the possibility of generalizing our results to the case of a more realistic cosmology. We find results … [Phys. Rev. D 94, 064040] Published Thu Sep 15, 2016

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Nonradial stability of marginal stable circular orbits in stationary axisymmetric spacetimes (2016)

Toshiaki Ono, Tomohito Suzuki, and Hideki Asada

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-17

Beschreibung: Author(s): Toshiaki Ono, Tomohito Suzuki, and Hideki Asada We study linear nonradial perturbations and stability of a marginal stable circular orbit such as the innermost stable circular orbit of a test particle in stationary axisymmetric spacetimes which possess a reflection symmetry with respect to the equatorial plane. A zenithal stability criterion is o… [Phys. Rev. D 94, 064042] Published Thu Sep 15, 2016

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Bowen-York-type initial data for binaries with neutron stars (2016)

Michael Clark and Pablo Laguna

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-22

Beschreibung: Author(s): Michael Clark and Pablo Laguna A new approach to construct initial data for binary systems with neutron star components is introduced. The approach is a generalization of the puncture initial data method for binary black holes based on Bowen-York solutions to the momentum constraint. As with binary black holes, the method allows … [Phys. Rev. D 94, 064058] Published Wed Sep 21, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Simple inflationary quintessential model. II. Power law potentials (2016)

Jaume de Haro, Jaume Amorós, and Supriya Pan

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-22

Beschreibung: Author(s): Jaume de Haro, Jaume Amorós, and Supriya Pan The present work is a sequel of our previous work [ Phys. Rev. D 93 , 084018 (2016)] which depicted a simple version of an inflationary quintessential model whose inflationary stage was described by a Higgs-type potential and the quintessential phase was responsible due to an exponential potential. Ad… [Phys. Rev. D 94, 064060] Published Wed Sep 21, 2016

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Spherical vacuum and scalar collapse for the Starobinsky R^{2} model (2016)

Jun-Qi Guo and Pankaj S. Joshi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-01

Beschreibung: Author(s): Jun-Qi Guo and Pankaj S. Joshi Spherical vacuum and scalar collapse for the Starobinsky R 2 model is simulated. Obtained by considering the quantum-gravitational effects, this model would admit some cases of singularity-free cosmological spacetimes. It is found, however, that in vacuum and scalar collapse, when f ′ or the physical … [Phys. Rev. D 94, 044063] Published Wed Aug 31, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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Oscillating chiral tensor spectrum from axionic inflation (2016)

Ippei Obata and Jiro Soda

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-01

Beschreibung: Author(s): Ippei Obata and Jiro Soda We study axionic inflation with a modulated potential and examine if the primordial tensor power spectrum exhibits oscillatory feature, which is testable with future space-based gravitational-wave experiments such as DECIGO and BBO. In the case of single-field axion monodromy inflation, it turns out… [Phys. Rev. D 94, 044062] Published Wed Aug 31, 2016

Schlagwort(e): General relativity, alternative theories of gravity

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[This Week in Science] Copper-catalyzed radical relay (2016)

Jake Yeston

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2016-09-07

Beschreibung: Author: Jake Yeston

Schlagwort(e): Organic Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Lorentzian proper vertex amplitude: Classical analysis and quantum derivation (2016)

Jonathan Engle and Antonia Zipfel

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-13

Beschreibung: Author(s): Jonathan Engle and Antonia Zipfel Spin foam models, an approach to defining the dynamics of loop quantum gravity, make use of the Plebanski formulation of gravity, in which gravity is recovered from a topological field theory via certain constraints called simplicity constraints. However, the simplicity constraints in their usual fo… [Phys. Rev. D 94, 064024] Published Fri Sep 09, 2016

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Inflationary spectra from a near Ω-deformed spacetime transition point in loop quantum cosmology (2016)

Long Chen and Jian-Yang Zhu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-09-14

Beschreibung: Author(s): Long Chen and Jian-Yang Zhu Anomaly-free perturbations of loop quantum cosmology with holonomy corrections reveal an Ω -deformed spacetime structure, Ω ≔ 1 − 2 ρ / ρ c , where Ω 〈 0 indicates a Euclidean-like space and Ω 〉 0 indicates a Lorentz-like space. It would be reasonable to give the initial value at the spacetime transition po… [Phys. Rev. D 94, 064037] Published Tue Sep 13, 2016

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Higher dimensional massive bigravity (2016)

Tuan Q. Do

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-12

Beschreibung: Author(s): Tuan Q. Do We study higher-dimensional scenarios of massive bigravity, which is a very interesting extension of nonlinear massive gravity since its reference metric is assumed to be fully dynamical. In particular, the Einstein field equations along with the following constraint equations for both physical and … [Phys. Rev. D 94, 044022] Published Thu Aug 11, 2016

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Holographic dual of a time machine (2016)

Irina Arefeva, Andrey Bagrov, Petter Säterskog, and Koenraad Schalm

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2016-08-30

Beschreibung: Author(s): Irina Arefeva, Andrey Bagrov, Petter Säterskog, and Koenraad Schalm Assuming that the AdS/CFT prescription is valid in the case of noncausal backgrounds, we apply it to the simplest possible eternal time machine solution in AdS 3 based on two conical defects moving around their center of mass along a circular orbit. Closed timelike curves in this space-time extend al… [Phys. Rev. D 94, 044059] Published Mon Aug 29, 2016

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Spin-multipole effects in binary black holes and the test-body limit (2018)

Justin Vines and Jan Steinhoff

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-03-13

Beschreibung: Author(s): Justin Vines and Jan Steinhoff We discuss the effects of the black holes’ spin-multipole structure in the orbital dynamics of binary black holes according to general relativity, focusing on the leading-post-Newtonian-order couplings at each order in an expansion in the black holes’ spins. We first review previous widely confirmed... [Phys. Rev. D 97, 064010] Published Mon Mar 12, 2018

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Unbound motion on a Schwarzschild background: Practical approaches to frequency domain computations (2018)

Seth Hopper

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-03-13

Beschreibung: Author(s): Seth Hopper Gravitational perturbations due to a point particle moving on a static black hole background are naturally described in Regge-Wheeler gauge. The first-order field equations reduce to a single master wave equation for each radiative mode. The master function satisfying this wave equation is a linear ... [Phys. Rev. D 97, 064007] Published Mon Mar 12, 2018

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Merger estimates for rotating Kerr black holes in modified gravity (2018)

Shao-Wen Wei and Yu-Xiao Liu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): Shao-Wen Wei and Yu-Xiao Liu In this paper, we explore the signatures of nonrotating and rotating black hole mergers in the matter-free modified gravity. First, we solve the unstable circular null orbits and the innermost stable circular timelike orbits via the geodesic motion. The characteristic quantities of these orbits are ... [Phys. Rev. D 98, 024042] Published Wed Jul 25, 2018

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Shadows of rotating wormholes (2018)

Rajibul Shaikh

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): Rajibul Shaikh We study shadows cast by a certain class of rotating wormholes and point out the crucial role of a rotating wormhole throat in the formation of a shadow. Overlooking this crucial role of a wormhole throat has resulted in incomplete results in the previous studies on shadows of the same class of rota... [Phys. Rev. D 98, 024044] Published Wed Jul 25, 2018

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Superradiant instabilities in scalar-tensor Horndeski theory (2018)

Theodoros Kolyvaris, Marina Koukouvaou, Antri Machattou, and Eleftherios Papantonopoulos

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): Theodoros Kolyvaris, Marina Koukouvaou, Antri Machattou, and Eleftherios Papantonopoulos We study the superradiance effect in a class of scalar-tensor Horndeski theory. We first study the dynamics of a massive charged scalar wave scattered off the horizon of a Reissner-Nordström black hole which, in addition to its canonical coupling to gravity, is also coupled kinetically to curvature.... [Phys. Rev. D 98, 024045] Published Wed Jul 25, 2018

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Dark energy and inflation with a volume normalized action (2018)

Gregory Gabadadze and Siqing Yu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-28

Beschreibung: Author(s): Gregory Gabadadze and Siqing Yu In the theories described by a volume normalized action functional, an arbitrary cosmological constant is eliminated from the physical picture of our Universe, and dynamical alternatives must be responsible for today’s accelerated expansion as well as the conjectured early-time inflation in the Univ... [Phys. Rev. D 98, 024047] Published Fri Jul 27, 2018

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Stability analysis of Schwarzschild black holes in dynamical Chern-Simons gravity (2018)

Masashi Kimura

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-28

Beschreibung: Author(s): Masashi Kimura Dynamical Chern-Simons gravity has an interesting feature that the parity violating term exists, and the coupling is determined by a dynamical scalar field. When the spacetime has spherical symmetry, the parity violating term vanishes, and then the metric of the Schwarzschild spacetime with vanishin... [Phys. Rev. D 98, 024048] Published Fri Jul 27, 2018

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Thermodynamic properties of dilaton black holes with nonlinear electrodynamics (2018)

M. Dehghani

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-04

Beschreibung: Author(s): M. Dehghani Thermodynamics and thermal stability of novel charged dilaton black holes have been analyzed in the presence of the exponential nonlinear electrodynamics. It has been found that the scalar field can be written as the linear combination of two Liouville-type potentials. Three new classes of nonlinear... [Phys. Rev. D 98, 044008] Published Fri Aug 03, 2018

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A Tale of two derivatives: Phase space symmetries and Noether charges in diffeomorphism invariant theories (2018)

Brian P. Dolan

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-04

Beschreibung: Author(s): Brian P. Dolan For a field theory that is invariant under diffeomorphisms there is a subtle interplay between symmetries, conservation laws and the phase space of the theory. The natural language for describing these ideas is that of differential forms, and both differential forms on space-time and differential fo... [Phys. Rev. D 98, 044009] Published Fri Aug 03, 2018

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Wormhole geometries supported by three-form fields (2018)

Bruno J. Barros and Francisco S. N. Lobo

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Bruno J. Barros and Francisco S. N. Lobo In this work, we find novel static and spherically symmetric wormhole geometries using a three-form field. By solving the gravitational field equations, we find a variety of analytical and numerical solutions and show that it is possible for the matter fields threading the wormhole to satisfy the nu... [Phys. Rev. D 98, 044012] Published Mon Aug 06, 2018

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Spontaneous growth of spinor fields in gravity (2018)

Fethi M. Ramazanoğlu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Fethi M. Ramazanoğlu We show that spinor fields nonminimally coupled to gravity can grow spontaneously in the presence of matter. We name this phenomenon spontaneous spinorization after the spontaneous scalarization scenario in scalar-tensor theories. Underlying reason for the growth of the spinor is an instability simi... [Phys. Rev. D 98, 044011] Published Mon Aug 06, 2018

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Trumpet initial data for boosted black holes (2018)

Kyle Slinker, Charles R. Evans, and Mark Hannam

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Kyle Slinker, Charles R. Evans, and Mark Hannam We describe a procedure for constructing initial data for boosted black holes in the moving-punctures approach to numerical relativity that endows the initial time slice from the outset with trumpet geometry within the black hole interiors. We then demonstrate the procedure in numerical simulations ... [Phys. Rev. D 98, 044014] Published Mon Aug 06, 2018

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Spontaneous growth of gauge fields in gravity through the Higgs mechanism (2018)

Fethi M. Ramazanoğlu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Fethi M. Ramazanoğlu We introduce gravity theories featuring spontaneously growing gauge fields where the growth is due to the Higgs mechanism. The underlying physics is inspired by the spontaneous scalarization phenomena in scalar-tensor theories. The tachyonic instability that causes the growth in spontaneous scalariz... [Phys. Rev. D 98, 044013] Published Mon Aug 06, 2018

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Eccentric binary black hole inspiral-merger-ringdown gravitational waveform model from numerical relativity and post-Newtonian theory (2018)

Ian Hinder, Lawrence E. Kidder, and Harald P. Pfeiffer

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Ian Hinder, Lawrence E. Kidder, and Harald P. Pfeiffer We present a prescription for computing gravitational waveforms for the inspiral, merger and ringdown of nonspinning moderately eccentric binary black hole systems. The inspiral waveform is computed using the post-Newtonian expansion and the merger waveform is computed by interpolating a small numbe... [Phys. Rev. D 98, 044015] Published Mon Aug 06, 2018

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Constraints on Einstein-aether theory after GW170817 (2018)

Jacob Oost, Shinji Mukohyama, and Anzhong Wang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-12

Beschreibung: Author(s): Jacob Oost, Shinji Mukohyama, and Anzhong Wang In this paper, we carry out a systematic analysis of the theoretical and observational constraints on the dimensionless coupling constants c i ( i = 1 , 2, 3, 4) of the Einstein-aether theory, taking into account the events GW170817 and GRB 170817A. The combination of these events restricts the deviation... [Phys. Rev. D 97, 124023] Published Mon Jun 11, 2018

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Nonmetricity formulation of general relativity and its scalar-tensor extension (2018)

Laur Järv, Mihkel Rünkla, Margus Saal, and Ott Vilson

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-12

Beschreibung: Author(s): Laur Järv, Mihkel Rünkla, Margus Saal, and Ott Vilson Einstein’s celebrated theory of gravitation can be presented in three forms: general relativity, teleparallel gravity, and the rarely considered before symmetric teleparallel gravity. Extending the latter, we introduce a new class of theories where a scalar field is coupled nonminimally to nonmetric... [Phys. Rev. D 97, 124025] Published Mon Jun 11, 2018

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Deflection of light by rotating regular black holes using the Gauss-Bonnet theorem (2018)

Kimet Jusufi, Ali Övgün, Joel Saavedra, Yerko Vásquez, and P. A. González

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-12

Beschreibung: Author(s): Kimet Jusufi, Ali Övgün, Joel Saavedra, Yerko Vásquez, and P. A. González In this paper, we study the weak gravitational lensing in the spacetime of rotating regular black hole geometries such as Ayon-Beato-García (ABG), Bardeen, and Hayward black holes. We calculate the deflection angle of light using the Gauss-Bonnet theorem (GBT) and show that the deflection of light c... [Phys. Rev. D 97, 124024] Published Mon Jun 11, 2018

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Towards construction of ghost-free higher derivative gravity from bigravity (2018)

Satoshi Akagi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-05

Beschreibung: Author(s): Satoshi Akagi In this paper, the ghost-freeness of the higher derivative theory proposed by Hassan et al. in [ Universe 1 , 92 (2015) ] is investigated. Hassan et al. believed the ghost-freeness of the higher derivative theory based on the analysis in the linear approximation. However, in order to obtain the complet... [Phys. Rev. D 97, 124001] Published Mon Jun 04, 2018

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Geodesic motion around traversable wormholes supported by a massless conformally coupled scalar field (2018)

Felix Willenborg, Saskia Grunau, Burkhard Kleihaus, and Jutta Kunz

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-05

Beschreibung: Author(s): Felix Willenborg, Saskia Grunau, Burkhard Kleihaus, and Jutta Kunz We consider a traversable wormhole solution of Einstein’s gravity conformally coupled to a massless scalar field, a solution derived by Barcelo and Visser based on the Janis-Newman-Winicour-Wyman spacetime. We study the geodesic motion of timelike and spacelike particles in this spacetime. We solve ... [Phys. Rev. D 97, 124002] Published Mon Jun 04, 2018

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Evading no-hair theorems: Hairy black holes in a Minkowski box (2018)

Oscar J. C. Dias and Ramon Masachs

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-14

Beschreibung: Author(s): Oscar J. C. Dias and Ramon Masachs We find hairy black holes of Einstein-Maxwell theory with a complex scalar field that is confined inside a box in a Minkowski background. These regular hairy black holes are asymptotically flat, and thus the presence of the box or mirror allows us to evade well-known no-hair theorems. We also find t... [Phys. Rev. D 97, 124030] Published Wed Jun 13, 2018

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Time travel using degenerate metrics (2018)

Sandipan Sengupta

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-16

Beschreibung: Author(s): Sandipan Sengupta The possibility of time travel is explored within the framework of first order gravity theory in vacuum. We present explicit solutions (to the field equations), whose geodesics allow the proper clock to run backwards. These four-geometries contain degenerate as well as nondegenerate tetrad fields th... [Phys. Rev. D 97, 124038] Published Fri Jun 15, 2018

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Hamiltonian formalism and constraint analysis of three-form matter models coupled with general relativity (2018)

David Brizuela and Iñaki Garay

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-22

Beschreibung: Author(s): David Brizuela and Iñaki Garay A Hamiltonian analysis of models given by a three-form field with a generic potential coupled to general relativity in four dimensions is performed. This kind of field is naturally present in string theory and cosmological scenarios. In particular, the action that is considered has been extensively ... [Phys. Rev. D 97, 124054] Published Thu Jun 21, 2018

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Astrometric effects of gravitational wave backgrounds with non-Einsteinian polarizations (2018)

Deyan P. Mihaylov, Christopher J. Moore, Jonathan R. Gair, Anthony Lasenby, and Gerard Gilmore

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-23

Beschreibung: Author(s): Deyan P. Mihaylov, Christopher J. Moore, Jonathan R. Gair, Anthony Lasenby, and Gerard Gilmore The Gaia mission offers a new opportunity to search for the low-frequency gravitational wave background using astrometric measurements. In this paper, the astrometric effect of gravitational waves is reviewed, with a particular focus on the effect of non-Einsteinian gravitational wave polarizations.... [Phys. Rev. D 97, 124058] Published Fri Jun 22, 2018

Schlagwort(e): General relativity, alternative theories of gravity

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Assessing the energetics of spinning binary black hole systems (2018)

Serguei Ossokine, Tim Dietrich, Evan Foley, Reza Katebi, and Geoffrey Lovelace

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-11-30

Beschreibung: Author(s): Serguei Ossokine, Tim Dietrich, Evan Foley, Reza Katebi, and Geoffrey Lovelace In this work we study the dynamics of spinning binary black hole systems in the strong field regime. For this purpose we extract from numerical relativity simulations the binding energy, specific orbital angular momentum, and gauge-invariant frequency. The goal of our work is threefold: First, we ex... [Phys. Rev. D 98, 104057] Published Thu Nov 29, 2018

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Testing modified gravity theory in the Milky Way (2018)

Carolina Negrelli, Maria Benito, Susana Landau, Fabio Iocco, and Lucila Kraiselburd

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-12-01

Beschreibung: Author(s): Carolina Negrelli, Maria Benito, Susana Landau, Fabio Iocco, and Lucila Kraiselburd We perform a test of John Moffat’s modified gravity theory (MOG) within the Milky Way, adopting the well-known “rotation curve” method. We use the dynamics of observed tracers within the disk to determine the gravitational potential as a function of galactocentric distance and compare that with the ... [Phys. Rev. D 98, 104061] Published Fri Nov 30, 2018

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Throttling process of the Kerr–Newman–anti-de Sitter black holes in the extended phase space (2018)

Ze-Wei Zhao, Yi-Hong Xiu, and Nan Li

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-12-06

Beschreibung: Author(s): Ze-Wei Zhao, Yi-Hong Xiu, and Nan Li The throttling process of the Kerr–Newman–anti-de Sitter (KN–AdS) black holes is systematically studied in the extended phase space. In this framework, the cosmological constant is interpreted as a varying thermodynamic pressure, and the black hole mass is identified with enthalpy. The throttling pr... [Phys. Rev. D 98, 124003] Published Wed Dec 05, 2018

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Revisiting wormhole energy conditions in Riemann-Cartan spacetimes and under Weyl transformations (2018)

Fayçal Hammad, Étienne Massé, and Patrick Labelle

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-12-13

Beschreibung: Author(s): Fayçal Hammad, Étienne Massé, and Patrick Labelle We show that the violation of the null energy condition by matter, required by traversable wormholes, can be removed in spacetimes with torsion. In addition, we show that this violation can also be removed in the conformal frame obtained by a Weyl transformation. This comes about because both confor... [Phys. Rev. D 98, 124010] Published Wed Dec 12, 2018

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Correlation patterns from massive phonons in $1+1$ dimensional acoustic black holes: A toy model (2018)

Richard A. Dudley, Paul R. Anderson, Roberto Balbinot, and Alessandro Fabbri

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-12-13

Beschreibung: Author(s): Richard A. Dudley, Paul R. Anderson, Roberto Balbinot, and Alessandro Fabbri Transverse excitations in analogue black holes induce a masslike term in the longitudinal mode equation. With a simple toy model we show that correlation functions display a rather rich structure characterized by groups of approximately parallel peaks. For the most part the structure is completely d... [Phys. Rev. D 98, 124011] Published Wed Dec 12, 2018

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Testing Weyl gravity at galactic and extra-galactic scales (2018)

Koushik Dutta and Tousif Islam

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-12-14

Beschreibung: Author(s): Koushik Dutta and Tousif Islam We examine the viability of Weyl conformal gravity as an alternative to the general theory of relativity. By using the extended rotation curve of the Milky Way and velocity dispersions of four globular clusters, we show that Weyl gravity predictions without resorting to dark matter comply with obser... [Phys. Rev. D 98, 124012] Published Thu Dec 13, 2018

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Impact of high-order tidal terms on binary neutron-star waveforms (2018)

Xisco Jiménez Forteza, Tiziano Abdelsalhin, Paolo Pani, and Leonardo Gualtieri

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-12-14

Beschreibung: Author(s): Xisco Jiménez Forteza, Tiziano Abdelsalhin, Paolo Pani, and Leonardo Gualtieri GW170817, the milestone gravitational-wave event originated from a binary neutron star merger, has allowed scientific community to place a constraint on the equation of state of neutron stars by extracting the leading-order, tidal-deformability term from the gravitational waveform. Here we incorpora... [Phys. Rev. D 98, 124014] Published Thu Dec 13, 2018

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Pulse profiles of highly compact pulsars in general relativity (2018)

Hajime Sotani and Umpei Miyamoto

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-10

Beschreibung: Author(s): Hajime Sotani and Umpei Miyamoto Gravitational light bending by compact stars is an important astrophysical phenomenon. The bending angle depends on the stellar compactness, which is the ratio of stellar mass M to radius R . In this paper, we investigate the pulse profile of highly compact rotating neutron stars for which the bendin... [Phys. Rev. D 98, 044017] Published Thu Aug 09, 2018

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Correspondence between the first and second order formalism by a metricity constraint (2018)

David Benisty and Eduardo I. Guendelman

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-15

Beschreibung: Author(s): David Benisty and Eduardo I. Guendelman A way to obtain a correspondence between the first order and second order formalism is studied. By introducing a Lagrange multiplier coupled to the covariant derivative of the metric, a metricity constraint is implemented. The new contributions which comes from the variation of the Lagrange multipli... [Phys. Rev. D 98, 044023] Published Tue Aug 14, 2018

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Linear stability analysis of a rotating thin-shell wormhole (2018)

Naoki Tsukamoto and Takafumi Kokubu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-16

Beschreibung: Author(s): Naoki Tsukamoto and Takafumi Kokubu We cut and paste two Bañados-Teitelboim-Zanelli (BTZ) spacetimes at a throat by the Darmois-Israel method to construct a rotating wormhole with a thin shell filled with a barotropic fluid. The thin shell at the throat and both sides of the throat corotate. We investigate the linear stability of the ... [Phys. Rev. D 98, 044026] Published Wed Aug 15, 2018

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Spacetime singularities in generalized Brans-Dicke theories (2018)

G. Brando, F. T. Falciano, and L. F. Guimarães

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-21

Beschreibung: Author(s): G. Brando, F. T. Falciano, and L. F. Guimarães We study the formation of classical singularities in generalized Brans-Dicke theories that are natural extensions to Brans-Dicke where the kinetic term is modified by a new coupling function ω ( φ ) . We discuss the asymptotic limit ω ( φ ) → ∞ and show that the system generically does not approach general r... [Phys. Rev. D 98, 044027] Published Mon Aug 20, 2018

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Axial quasinormal modes of scalarized neutron stars with realistic equations of state (2018)

Zahra Altaha Motahar, Jose Luis Blázquez-Salcedo, Burkhard Kleihaus, and Jutta Kunz

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-21

Beschreibung: Author(s): Zahra Altaha Motahar, Jose Luis Blázquez-Salcedo, Burkhard Kleihaus, and Jutta Kunz We compute the axial quasinormal modes of static neutron stars in scalar tensor theory. In particular, we employ various realistic equations of state including nuclear, hyperonic and hybrid matter. We investigate the fundamental curvature mode and compare the results with those of general relativity... [Phys. Rev. D 98, 044032] Published Mon Aug 20, 2018

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Measuring the properties of nearly extremal black holes with gravitational waves (2018)

Katerina Chatziioannou, Geoffrey Lovelace, Michael Boyle, Matthew Giesler, Daniel A. Hemberger, Reza Katebi, Lawrence E. Kidder, Harald P. Pfeiffer, Mark A. Scheel, and Béla Szilágyi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-22

Beschreibung: Author(s): Katerina Chatziioannou, Geoffrey Lovelace, Michael Boyle, Matthew Giesler, Daniel A. Hemberger, Reza Katebi, Lawrence E. Kidder, Harald P. Pfeiffer, Mark A. Scheel, and Béla Szilágyi Characterizing the properties of black holes is one of the most important science objectives for gravitational-wave observations. Astrophysical evidence suggests that black holes that are nearly extremal (i.e., spins near the theoretical upper limit) might exist and, thus, might be among the merging... [Phys. Rev. D 98, 044028] Published Tue Aug 21, 2018

Schlagwort(e): General relativity, alternative theories of gravity

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Particle swarm optimization based search for gravitational waves from compact binary coalescences: Performance improvements (2018)

Marc E. Normandin, Soumya D. Mohanty, and Thilina S. Weerathunga

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-22

Beschreibung: Author(s): Marc E. Normandin, Soumya D. Mohanty, and Thilina S. Weerathunga While a fully coherent all-sky search is known to be optimal for detecting signals from compact binary coalescences (CBCs), its high computational cost has limited current searches to less sensitive coincidence-based schemes. For a network of first-generation GW detectors, it has been demonstrated t... [Phys. Rev. D 98, 044029] Published Tue Aug 21, 2018

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Comprehensive model for the spin evolution of the $LAGEOS$ and $LARES$ satellites (2018)

Massimo Visco and David M. Lucchesi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-22

Beschreibung: Author(s): Massimo Visco and David M. Lucchesi The two L A G E O S and L A R E S are laser-ranged satellites tracked with the best accuracy ever achieved. Using their range measurements many geophysical parameters were calculated and some general relativity effects were directly observed. To obtain precise and refined measurements of the effects due to t... [Phys. Rev. D 98, 044034] Published Tue Aug 21, 2018

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Galileon and generalized Galileon with projective invariance in a metric-affine formalism (2018)

Katsuki Aoki and Keigo Shimada

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): Katsuki Aoki and Keigo Shimada We study scalar-tensor theories respecting the projective invariance in the metric-affine formalism. The metric-affine formalism is a formulation of gravitational theories such that the metric and the connection are independent variables in the first place. In this formalism, the Einstein-Hilbert ac... [Phys. Rev. D 98, 044038] Published Fri Aug 24, 2018

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Viable inflation in scalar-Gauss-Bonnet gravity and reconstruction from observational indices (2018)

S. D. Odintsov and V. K. Oikonomou

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): S. D. Odintsov and V. K. Oikonomou In this paper we on inflationary dynamics in the context of Einstein-Gauss-Bonnet gravitational theories. We investigate the implications of the slow-roll condition on the slow-roll indices and we investigate how the inflationary dynamical evolution is affected by the presence of the Gauss-Bonnet co... [Phys. Rev. D 98, 044039] Published Fri Aug 24, 2018

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Quasinormal modes of massless scalar fields for charged black holes in the Palatini-type gravity (2018)

Che-Yu Chen and Pisin Chen

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-28

Beschreibung: Author(s): Che-Yu Chen and Pisin Chen The scrutiny of black hole perturbations and its application to testing gravity theories have been a very crucial frontier in modern physics. In this paper we study the quasinormal modes (QNM) of massless scalar perturbations for various charged black holes in the Palatini-type theories of gravity. ... [Phys. Rev. D 98, 044042] Published Mon Aug 27, 2018

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Dynamics of test particles in the five-dimensional Gödel spacetime (2018)

Kevin Eickhoff and Stephan Reimers

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-30

Beschreibung: Author(s): Kevin Eickhoff and Stephan Reimers We derive the complete set of geodesic equations for massive charged test particle and light motion in the five-dimensional, rotating and charged solution of the Einstein-Maxwell-Chern-Simons field equations in five-dimensional minimal gauged supergravity and present their analytical solutions. We s... [Phys. Rev. D 98, 044050] Published Wed Aug 29, 2018

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Spin-precessing black hole binaries in dynamical Chern-Simons gravity (2018)

Nicholas Loutrel, Takahiro Tanaka, and Nicolás Yunes

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-09-13

Beschreibung: Author(s): Nicholas Loutrel, Takahiro Tanaka, and Nicolás Yunes Gravitational waves from spin-precessing binaries exhibit amplitude oscillations that provide an invaluable method to extract the spins of the inspiraling compact objects. The spin-spin and spin-orbit interactions that cause this effect are sensitive to the fundamental nature of gravity, which will ... [Phys. Rev. D 98, 064020] Published Wed Sep 12, 2018

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