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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2002.08559 | Zack Carson | Zack Carson and Kent Yagi | Probing string-inspired gravity with the inspiral-merger-ringdown
consistency tests of gravitational waves | 13 pages, 3 figures; updated to published version. Carson et al 2020
Class. Quantum Grav | null | 10.1088/1361-6382/aba221 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The extreme-gravity collisions between black holes allow us to probe the
underlying theory of gravity. We apply the theory-agnostic
inspiral-merger-ringdown consistency test to an example theory beyond general
relativity for the first time. Here we focus on the string-inspired
Einstein-dilaton Gauss-Bonnet gravity an... | [
{
"created": "Thu, 20 Feb 2020 04:12:29 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jul 2020 15:08:09 GMT",
"version": "v2"
}
] | 2020-07-06 | [
[
"Carson",
"Zack",
""
],
[
"Yagi",
"Kent",
""
]
] | The extreme-gravity collisions between black holes allow us to probe the underlying theory of gravity. We apply the theory-agnostic inspiral-merger-ringdown consistency test to an example theory beyond general relativity for the first time. Here we focus on the string-inspired Einstein-dilaton Gauss-Bonnet gravity and ... |
2404.09049 | Shankar Dayal Pathak | Gaurav Bhandari, S. D. Pathak, Manabendra Sharma, Anzhong Wang | Quantum deformed phantom dynamics in light of the generalized
uncertainty principle | null | null | null | null | gr-qc astro-ph.CO astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Quantum gravity has been baffling the theoretical physicist for decades now:
both for its mathematical obscurity and phenomenological testing. Nevertheless,
the new era of precision cosmology presents a promising avenue to test the
effects of quantum gravity. In this study, we consider a bottom-up approach.
Without r... | [
{
"created": "Sat, 13 Apr 2024 17:27:47 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Bhandari",
"Gaurav",
""
],
[
"Pathak",
"S. D.",
""
],
[
"Sharma",
"Manabendra",
""
],
[
"Wang",
"Anzhong",
""
]
] | Quantum gravity has been baffling the theoretical physicist for decades now: both for its mathematical obscurity and phenomenological testing. Nevertheless, the new era of precision cosmology presents a promising avenue to test the effects of quantum gravity. In this study, we consider a bottom-up approach. Without res... |
2108.07766 | Ali \"Ovg\"un Dr. | Mert Okyay, Ali \"Ovg\"un | Nonlinear electrodynamics effects on the black hole shadow, deflection
angle, quasinormal modes and greybody factors | 36 pages. Accepted for publication in Journal of Cosmology and
Astroparticle Physics (JCAP) | JCAP01(2022)009 | 10.1088/1475-7516/2022/01/009 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we discuss the effects of nonlinear electrodynamics (NED) on
non-rotating black holes, parametrized by the field coupling parameter $\beta$
and magnetic charge parameter $P$ in detail. Particularly, we survey physical
properties of the magnetically charged black hole, thermodynamic properties,
observat... | [
{
"created": "Tue, 17 Aug 2021 17:17:19 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2021 17:38:41 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jan 2022 20:57:09 GMT",
"version": "v3"
}
] | 2022-01-06 | [
[
"Okyay",
"Mert",
""
],
[
"Övgün",
"Ali",
""
]
] | In this paper, we discuss the effects of nonlinear electrodynamics (NED) on non-rotating black holes, parametrized by the field coupling parameter $\beta$ and magnetic charge parameter $P$ in detail. Particularly, we survey physical properties of the magnetically charged black hole, thermodynamic properties, observatio... |
2401.12040 | Sergey Yu. Vernov | Ekaterina O. Pozdeeva and Sergey Yu. Vernov | Construction of Chiral Cosmological Models Unifying Inflation and
Primordial Black Hole Formation | 6 pages | SPACE, TIME AND FUNDAMENTAL INTERACTIONS, 2024, V. 1 (46), P. 90 | 10.17238/issn2226-8812.2024.1.90-94 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the method for construction of $F(R,\xi)$ gravity model, unifying
inflation and primordial black hole formation. The proposed models are based on
the Starobinsky $R+R^2$ inflationary model, so, the function $F(R,\xi)$ is a
quadratic polynomial of the Ricci scalar $R$. We show that the potential of the
corr... | [
{
"created": "Mon, 22 Jan 2024 15:27:36 GMT",
"version": "v1"
}
] | 2024-06-14 | [
[
"Pozdeeva",
"Ekaterina O.",
""
],
[
"Vernov",
"Sergey Yu.",
""
]
] | We propose the method for construction of $F(R,\xi)$ gravity model, unifying inflation and primordial black hole formation. The proposed models are based on the Starobinsky $R+R^2$ inflationary model, so, the function $F(R,\xi)$ is a quadratic polynomial of the Ricci scalar $R$. We show that the potential of the corres... |
1201.4429 | Alexandre Baranov | A.M.Baranov | Interior Static Stellar Model with Electric Charge as an Oscillator | 2 pages, Talk presented at the 5th Int. Conf. on Grav. and Astrophys.
of Acian-Pacific Countries (ICGA-5), Moscow, 2001 | Gravitation and Cosmology, Vol.8 (2002), Supplement II, pp.10-11 | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model approach to the description of static stars filled with a charged
Pascal perfect fluid within the framework of general relativity is
investigated. The metric is written in Bondi's radiation coordinates. The
gravitational equations are reduced to a nonlinear oscillator equation after
transfomation to a new var... | [
{
"created": "Sat, 21 Jan 2012 03:54:40 GMT",
"version": "v1"
}
] | 2012-01-24 | [
[
"Baranov",
"A. M.",
""
]
] | A model approach to the description of static stars filled with a charged Pascal perfect fluid within the framework of general relativity is investigated. The metric is written in Bondi's radiation coordinates. The gravitational equations are reduced to a nonlinear oscillator equation after transfomation to a new varia... |
1107.3749 | Daniele Malafarina | Pankaj S. Joshi, Daniele Malafarina, Ravindra V. Saraykar | Genericity aspects in gravitational collapse to black holes and naked
singularities | 24 pages, 6 figures, some changes in text and figures to match the
version accepted for publication by IJMPD | null | 10.1142/S0218271812500666 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate here the genericity and stability aspects for naked
singularities and black holes that arise as the final states for a complete
gravitational collapse of a spherical massive matter cloud. The form of the
matter considered is a general Type I matter field, which includes most of the
physically reasonabl... | [
{
"created": "Tue, 19 Jul 2011 15:41:58 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2012 13:36:06 GMT",
"version": "v2"
}
] | 2012-11-15 | [
[
"Joshi",
"Pankaj S.",
""
],
[
"Malafarina",
"Daniele",
""
],
[
"Saraykar",
"Ravindra V.",
""
]
] | We investigate here the genericity and stability aspects for naked singularities and black holes that arise as the final states for a complete gravitational collapse of a spherical massive matter cloud. The form of the matter considered is a general Type I matter field, which includes most of the physically reasonable ... |
2305.10776 | Viola De Renzis | Viola De Renzis | Up-down binaries are unstable and we want to know | Contribution to the 2023 Gravitation session of the 57th Rencontres
de Moriond | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic spin-precession equations for black-hole binaries have four
different equilibrium solutions that correspond to systems where the two
individual black hole spins are either aligned or anti-aligned with the orbital
angular momentum. Surprisingly, it was demonstrated that only three of these
equilibrium... | [
{
"created": "Thu, 18 May 2023 07:35:05 GMT",
"version": "v1"
}
] | 2023-05-19 | [
[
"De Renzis",
"Viola",
""
]
] | The relativistic spin-precession equations for black-hole binaries have four different equilibrium solutions that correspond to systems where the two individual black hole spins are either aligned or anti-aligned with the orbital angular momentum. Surprisingly, it was demonstrated that only three of these equilibrium s... |
2111.06441 | Angelo E. S. Hartmann | Mario Novello, Angelo E. S. Hartmann, E. Bittencourt | Galaxy rotation curves in the light of the Spinor Theory of Gravity | 5 pages | Mod. Phys. Lett. A 36 (2021) 2150248 | 10.1142/S0217732321502485 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We analyze the recently obtained static and spherically symmetric solution of
the Spinor Theory of Gravity (STG) which, in the weak field limit, presents an
effective Newtonian potential that contains an extra logarithmic behavior. We
apply this solution to the description of the galaxy rotation curves finding an
int... | [
{
"created": "Thu, 11 Nov 2021 19:45:52 GMT",
"version": "v1"
}
] | 2021-12-20 | [
[
"Novello",
"Mario",
""
],
[
"Hartmann",
"Angelo E. S.",
""
],
[
"Bittencourt",
"E.",
""
]
] | We analyze the recently obtained static and spherically symmetric solution of the Spinor Theory of Gravity (STG) which, in the weak field limit, presents an effective Newtonian potential that contains an extra logarithmic behavior. We apply this solution to the description of the galaxy rotation curves finding an inter... |
1410.5785 | Dario Nunez Dr. | Juan Carlos Degollado, Victor Gualajara, Claudia Moreno, and Dar\'io
N\'u\~nez | Electromagnetic partner of the gravitational signal during accretion
onto black holes | 12 pages, six figures | null | 10.1007/s10714-014-1819-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the generation of electromagnetic and gravitational radiation
in the vicinity of a perturbed Schwarzschild black hole. The gravitational
perturbations and the electromagnetic field are studied by solving the
Teukolsky master equation with sources, which we take to be locally charged,
radially infalling... | [
{
"created": "Tue, 21 Oct 2014 18:55:23 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Degollado",
"Juan Carlos",
""
],
[
"Gualajara",
"Victor",
""
],
[
"Moreno",
"Claudia",
""
],
[
"Núñez",
"Darío",
""
]
] | We investigate the generation of electromagnetic and gravitational radiation in the vicinity of a perturbed Schwarzschild black hole. The gravitational perturbations and the electromagnetic field are studied by solving the Teukolsky master equation with sources, which we take to be locally charged, radially infalling, ... |
gr-qc/9710039 | Jerzy Kowalski-Glikman | A. B{\l}aut and J. Kowalski-Glikman | Constraints and Solutions of Quantum Gravity in Metric Representation | 17 pages, plain LaTeX | null | null | null | gr-qc | null | We construct the regularised Wheeler-De Witt operator demanding that the
algebra of constraints of quantum gravity is anomaly free. We find that for a
subset of all wavefunctions being integrals of scalar densities this condition
can be satisfied. We proceed to finding exact solutions of quantum gravity
being of the ... | [
{
"created": "Tue, 7 Oct 1997 15:42:05 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Błaut",
"A.",
""
],
[
"Kowalski-Glikman",
"J.",
""
]
] | We construct the regularised Wheeler-De Witt operator demanding that the algebra of constraints of quantum gravity is anomaly free. We find that for a subset of all wavefunctions being integrals of scalar densities this condition can be satisfied. We proceed to finding exact solutions of quantum gravity being of the fo... |
2403.07250 | Haoxuan Sun | Zirui Hu, Haoxuan Sun | Integrating Gauss-Bonnet Corrections in Quantum Field Theory:
Implications for Torsion, Gauge Bosons, and the Hubble Constant | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We explore matter fields containing Gauss-Bonnet correction terms within the
framework of renormalizable quantum field theory. By revising the gauge model
with a charged scalar multiplier and two sets of fermion families within a flat
universe model using torsion, we introduce Gauss-Bonnet corrections into the
action... | [
{
"created": "Tue, 12 Mar 2024 02:18:54 GMT",
"version": "v1"
}
] | 2024-03-13 | [
[
"Hu",
"Zirui",
""
],
[
"Sun",
"Haoxuan",
""
]
] | We explore matter fields containing Gauss-Bonnet correction terms within the framework of renormalizable quantum field theory. By revising the gauge model with a charged scalar multiplier and two sets of fermion families within a flat universe model using torsion, we introduce Gauss-Bonnet corrections into the action t... |
1609.04812 | J. Brian Pitts | J. Brian Pitts | Equivalent Theories Redefine Hamiltonian Observables to Exhibit Change
in General Relativity | Published in Classical and Quantum Gravity. A related CQG+ article is
on the way | Classical and Quantum Gravity 34 (2017) 055008 | 10.1088/1361-6382/aa5ce8 | null | gr-qc hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Change and local spatial variation are missing in canonical General
Relativity's observables as usually defined, part of the problem of time.
Definitions can be tested using equivalent formulations, non-gauge and gauge,
because they must have equivalent observables and everything is observable in
the non-gauge formul... | [
{
"created": "Thu, 15 Sep 2016 18:38:12 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Mar 2017 13:27:55 GMT",
"version": "v2"
}
] | 2017-03-06 | [
[
"Pitts",
"J. Brian",
""
]
] | Change and local spatial variation are missing in canonical General Relativity's observables as usually defined, part of the problem of time. Definitions can be tested using equivalent formulations, non-gauge and gauge, because they must have equivalent observables and everything is observable in the non-gauge formulat... |
2111.10052 | Li Tang | Li Tang, Hai-Nan Lin, Xin Li and Liang Liu | Reconstructing the Hubble diagram of gamma-ray bursts using deep
learning | 10 pages, 6 figures, 3 tables | Monthly Notices of the Royal Astronomical Society, 509, 1194-1200
(2022) | 10.1093/mnras/stab2932 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calibrate the distance and reconstruct the Hubble diagram of gamma-ray
bursts (GRBs) using deep learning. We construct an artificial neural network,
which combines the recurrent neural network and Bayesian neural network, and
train the network using the Pantheon compilation of type-Ia supernovae. The
trained netwo... | [
{
"created": "Fri, 19 Nov 2021 05:31:34 GMT",
"version": "v1"
}
] | 2021-11-22 | [
[
"Tang",
"Li",
""
],
[
"Lin",
"Hai-Nan",
""
],
[
"Li",
"Xin",
""
],
[
"Liu",
"Liang",
""
]
] | We calibrate the distance and reconstruct the Hubble diagram of gamma-ray bursts (GRBs) using deep learning. We construct an artificial neural network, which combines the recurrent neural network and Bayesian neural network, and train the network using the Pantheon compilation of type-Ia supernovae. The trained network... |
1908.06759 | Pardyumn Kumar Sahoo | Snehasish Bhattacharjee, P.K. Sahoo | Constraining f(R,T) Gravity From The Dark Energy Density Parameter
$\Omega_{\Lambda}$ | To appear in Gravitation and Cosmology | Gravitation and Cosmology, 26(3) (2020) 281-284 | 10.1134/S0202289320030032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $f(R,T)$ gravity is a widely used extended theory of gravity introduced in
\cite{9} which is a straightforward generalization of $f(R)$ gravity. The
action in this extended theory of gravity incorporates well motivated
functional forms of the Ricci scalar $R$ and trace of energy momentum tensor
$T$. The present manus... | [
{
"created": "Fri, 16 Aug 2019 01:33:57 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Sep 2019 03:45:50 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Nov 2019 09:05:10 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Jun 2020 06:42:45 GMT",
"version": "v4"
}
] | 2020-07-09 | [
[
"Bhattacharjee",
"Snehasish",
""
],
[
"Sahoo",
"P. K.",
""
]
] | $f(R,T)$ gravity is a widely used extended theory of gravity introduced in \cite{9} which is a straightforward generalization of $f(R)$ gravity. The action in this extended theory of gravity incorporates well motivated functional forms of the Ricci scalar $R$ and trace of energy momentum tensor $T$. The present manuscr... |
1507.03127 | J Erik Baxter | J. Erik Baxter | Stable topological hairy black holes in $\mathfrak{su}(N)$ EYM theory
with $\Lambda<0$ | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the linear stability of topological black hole solutions to
four-dimensional SU(N) Einstein-Yang-Mills theory with a negative cosmological
constant. We here extend recent results in the field which prove the existence
of hairy black hole solutions to such equations, and the stability of their
spherical... | [
{
"created": "Sat, 11 Jul 2015 17:03:12 GMT",
"version": "v1"
}
] | 2015-07-14 | [
[
"Baxter",
"J. Erik",
""
]
] | We investigate the linear stability of topological black hole solutions to four-dimensional SU(N) Einstein-Yang-Mills theory with a negative cosmological constant. We here extend recent results in the field which prove the existence of hairy black hole solutions to such equations, and the stability of their spherically... |
1205.4530 | Steven Hergt | Steven Hergt, Jan Steinhoff and Gerhard Schaefer | On the comparison of results regarding the post-Newtonian approximate
treatment of the dynamics of extended spinning compact binaries | Conference proceedings for the 7th International Conference on
Gravitation and Cosmology (ICGC2011), 4 pages | null | 10.1088/1742-6596/484/1/012018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A brief review is given of all the Hamiltonians and effective potentials
calculated hitherto covering the post-Newtonian (pN) dynamics of a two body
system. A method is presented to compare (conservative) reduced Hamiltonians
with nonreduced potentials directly at least up to the next-to-leading-pN
order.
| [
{
"created": "Mon, 21 May 2012 09:13:51 GMT",
"version": "v1"
}
] | 2016-06-15 | [
[
"Hergt",
"Steven",
""
],
[
"Steinhoff",
"Jan",
""
],
[
"Schaefer",
"Gerhard",
""
]
] | A brief review is given of all the Hamiltonians and effective potentials calculated hitherto covering the post-Newtonian (pN) dynamics of a two body system. A method is presented to compare (conservative) reduced Hamiltonians with nonreduced potentials directly at least up to the next-to-leading-pN order. |
gr-qc/9711056 | Steven Weinstein | Steven Weinstein (Dept. of Philosophy, Northwestern University) | Time, Gauge, and the Superposition Principle in Quantum Gravity | 3 pages, LaTeX. Requires mprocl.sty, available at
ftp://shemesh.fiz.huji.ac.il/pub/mprocl.sty . To be published in the
proceedings of the Eighth Marcel Grossmann Meeting on General Relativity.
(Jerusalem, June, 1997) | null | null | null | gr-qc quant-ph | null | The quantization of time-reparametrization invariant systems such as general
relativity is plagued by an ambiguity relating to the role of time in the
theory. If one parametrizes observables by the (unobservable) time, and then
relies on the existence of an approximate "clock" degree of freedom to give
physical meani... | [
{
"created": "Tue, 18 Nov 1997 16:28:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Weinstein",
"Steven",
"",
"Dept. of Philosophy, Northwestern University"
]
] | The quantization of time-reparametrization invariant systems such as general relativity is plagued by an ambiguity relating to the role of time in the theory. If one parametrizes observables by the (unobservable) time, and then relies on the existence of an approximate "clock" degree of freedom to give physical meaning... |
1002.1472 | Lan-Hsuan Huang | Lan-Hsuan Huang | Solutions of special asymptotics to the Einstein constraint equations | 13 pages; the error in Lemma 3.5 fixed and typos corrected; to appear
in Class. Quantum Grav | null | 10.1088/0264-9381/27/24/245002 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct solutions with prescribed asymptotics to the Einstein constraint
equations using a cut-off technique. Moreover, we give various examples of
vacuum asymptotically flat manifolds whose center of mass and angular momentum
are ill-defined.
| [
{
"created": "Sun, 7 Feb 2010 18:10:59 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Oct 2010 13:53:49 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Huang",
"Lan-Hsuan",
""
]
] | We construct solutions with prescribed asymptotics to the Einstein constraint equations using a cut-off technique. Moreover, we give various examples of vacuum asymptotically flat manifolds whose center of mass and angular momentum are ill-defined. |
1705.03495 | Tomas Ortin | Tomas Ortin | Higher order gravities and the Strong Equivalence Principle | Additional resulting the gauge transformation of the gravitational
energy-momentum tensor and references added. 18 pages, no figures | null | 10.1007/JHEP09(2017)152 | IFT-UAM/CSIC-17-032 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, in all metric theories of gravity with a general covariant
action, gravity couples to the gravitational energy-momentum tensor in the same
way it couples to the matter energy-momentum tensor order by order in the weak
field approximation around flat spacetime. We discuss the relation of this
property to... | [
{
"created": "Tue, 9 May 2017 19:15:27 GMT",
"version": "v1"
},
{
"created": "Thu, 18 May 2017 16:04:16 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Ortin",
"Tomas",
""
]
] | We show that, in all metric theories of gravity with a general covariant action, gravity couples to the gravitational energy-momentum tensor in the same way it couples to the matter energy-momentum tensor order by order in the weak field approximation around flat spacetime. We discuss the relation of this property to t... |
2205.08160 | Aneta Wojnar | Aneta Wojnar | Stellar and substellar objects in modified gravity | 20 pages, 1 figure, Invited contribution to the forthcoming book
"Modified and Quantum Gravity - From theory to experimental searches on all
scales", Springer Nature, Eds C. L\"ammerzahl and C. Pfeifer | null | 10.1007/978-3-031-31520-6 | null | gr-qc astro-ph.EP astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The last findings on stellar and substellar objects in modified gravity are
presented, allowing a reader to quickly jump into this topic. Early stellar
evolution of low-mass stars, cooling models of brown dwarfs and giant gaseous
exoplanets as well as internal structure of terrestrial planets are discussed.
Moreover,... | [
{
"created": "Tue, 17 May 2022 07:51:57 GMT",
"version": "v1"
}
] | 2023-11-27 | [
[
"Wojnar",
"Aneta",
""
]
] | The last findings on stellar and substellar objects in modified gravity are presented, allowing a reader to quickly jump into this topic. Early stellar evolution of low-mass stars, cooling models of brown dwarfs and giant gaseous exoplanets as well as internal structure of terrestrial planets are discussed. Moreover, p... |
gr-qc/0108086 | Luc Blanchet | Luc Blanchet | On the two-body problem in general relativity | 10 pages, to appear in a special issue of Comptes Rendus de
l'Academie des Sciences, Paris, on the subject "Missions Spatiales en
Physique Fondamentale" | null | 10.1016/S1296-2147(01)01267-7 | null | gr-qc | null | We consider the two-body problem in post-Newtonian approximations of general
relativity. We report the recent results concerning the equations of motion,
and the associated Lagrangian formulation, of compact binary systems, at the
third post-Newtonian order (1/c^6 beyond the Newtonian acceleration). These
equations a... | [
{
"created": "Fri, 31 Aug 2001 11:56:29 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Blanchet",
"Luc",
""
]
] | We consider the two-body problem in post-Newtonian approximations of general relativity. We report the recent results concerning the equations of motion, and the associated Lagrangian formulation, of compact binary systems, at the third post-Newtonian order (1/c^6 beyond the Newtonian acceleration). These equations are... |
gr-qc/0310017 | Massimo Tinto | Massimo Tinto, Frank B. Estabrook, adn J.W. Armstrong | Time Delay Interferometry with Moving Spacecraft Arrays | Modified version, which is scheduled to appear on the PRD April 15,
2004 issue | Phys.Rev. D69 (2004) 082001 | 10.1103/PhysRevD.69.082001 | null | gr-qc | null | Space-borne interferometric gravitational wave detectors, sensitive in the
low-frequency (millihertz) band, will fly in the next decade. In these
detectors the spacecraft-to-spacecraft light-travel-times will necessarily be
unequal, time-varying, and (due to aberration) have different time delays on
up- and down-link... | [
{
"created": "Fri, 3 Oct 2003 07:15:55 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2004 23:18:06 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Tinto",
"Massimo",
""
],
[
"Estabrook",
"Frank B.",
""
],
[
"Armstrong",
"adn J. W.",
""
]
] | Space-borne interferometric gravitational wave detectors, sensitive in the low-frequency (millihertz) band, will fly in the next decade. In these detectors the spacecraft-to-spacecraft light-travel-times will necessarily be unequal, time-varying, and (due to aberration) have different time delays on up- and down-links.... |
1907.12890 | Filiz \c{C}a\u{g}atay U\c{c}gun | Filiz \c{C}a\u{g}atay U\c{c}gun, O\u{g}ul Esen and Hasan G\"umral | Reductions of Topologically Massive Gravity II: First Order Realizations
of Second Order Lagrangians | 35 pages | null | 10.1063/1.5123020 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Second order degenerate Cl\`ement and Sar{\i}o\u{g}lu-Tekin Lagrangians are
casted into forms of various first order Lagrangians. Hamiltonian analysis of
these equivalent formalisms are performed by means of Dirac-Bergmann constraint
algorithm.
| [
{
"created": "Wed, 24 Jul 2019 06:45:12 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Uçgun",
"Filiz Çağatay",
""
],
[
"Esen",
"Oğul",
""
],
[
"Gümral",
"Hasan",
""
]
] | Second order degenerate Cl\`ement and Sar{\i}o\u{g}lu-Tekin Lagrangians are casted into forms of various first order Lagrangians. Hamiltonian analysis of these equivalent formalisms are performed by means of Dirac-Bergmann constraint algorithm. |
2007.09481 | Lorenzo Gavassino | Lorenzo Gavassino, Marco Antonelli and Brynmor Haskell | Multifluid Modelling of Relativistic Radiation Hydrodynamics | 19 pages, 0 figures, published on Symmetry | null | 10.3390/sym12091543 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formulation of a universal theory for bulk viscosity and heat conduction
represents a theoretical challenge for our understanding of relativistic fluid
dynamics. Recently, it has been shown that the multifluid variational approach
championed by Carter and collaborators has the potential to be a general and
natura... | [
{
"created": "Sat, 18 Jul 2020 17:20:37 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2020 18:59:32 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Oct 2020 13:29:52 GMT",
"version": "v3"
}
] | 2020-10-15 | [
[
"Gavassino",
"Lorenzo",
""
],
[
"Antonelli",
"Marco",
""
],
[
"Haskell",
"Brynmor",
""
]
] | The formulation of a universal theory for bulk viscosity and heat conduction represents a theoretical challenge for our understanding of relativistic fluid dynamics. Recently, it has been shown that the multifluid variational approach championed by Carter and collaborators has the potential to be a general and natural ... |
2404.16943 | Alexander Florian Jercher | Alexander F. Jercher, Jos\'e Diogo Sim\~ao, Sebastian Steinhaus | Partial absence of cosine problem in 3d Lorentzian spin foams | 5 pages, 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the semi-classical limit of the recently proposed coherent spin foam
model for (2+1) Lorentzian quantum gravity. Specifically, we analyze the gluing
equations derived from the stationary phase approximation of the vertex
amplitude. Typically these exhibit two solutions yielding a cosine of the Regge
action. ... | [
{
"created": "Thu, 25 Apr 2024 18:00:19 GMT",
"version": "v1"
}
] | 2024-04-29 | [
[
"Jercher",
"Alexander F.",
""
],
[
"Simão",
"José Diogo",
""
],
[
"Steinhaus",
"Sebastian",
""
]
] | We study the semi-classical limit of the recently proposed coherent spin foam model for (2+1) Lorentzian quantum gravity. Specifically, we analyze the gluing equations derived from the stationary phase approximation of the vertex amplitude. Typically these exhibit two solutions yielding a cosine of the Regge action. Ho... |
1601.02895 | Salako Ines Godonou SIG | M. G. Ganiou (Benin, IMSP), Ines G. Salako (Benin, IMSP & Ketou U.),
M. J. S. Houndjo (Benin, IMSP & Natitingou U.), J. Tossa (Benin, IMSP) | Geodesic Deviation Equation in $\Lambda$CDM $f(T,\mathcal{T})$ gravity | 20 pages, 2 figures | Int J Theor Phys, Vol. 55, No. 5 (2016) 2303 - 2696 | 10.1007/s10773-016-3025-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geodesic deviation equation has been investigated in the framework of
$f(T,\mathcal{T})$ gravity, where $T$ denotes the torsion and $\mathcal{T}$ is
the trace of the energy-momentum tensor, respectively. The FRW metric is
assumed and the geodesic deviation equation has been established following the
General Relat... | [
{
"created": "Thu, 31 Dec 2015 11:50:44 GMT",
"version": "v1"
}
] | 2016-05-06 | [
[
"Ganiou",
"M. G.",
"",
"Benin, IMSP"
],
[
"Salako",
"Ines G.",
"",
"Benin, IMSP & Ketou U."
],
[
"Houndjo",
"M. J. S.",
"",
"Benin, IMSP & Natitingou U."
],
[
"Tossa",
"J.",
"",
"Benin, IMSP"
]
] | The geodesic deviation equation has been investigated in the framework of $f(T,\mathcal{T})$ gravity, where $T$ denotes the torsion and $\mathcal{T}$ is the trace of the energy-momentum tensor, respectively. The FRW metric is assumed and the geodesic deviation equation has been established following the General Relativ... |
1403.6937 | Gamal G.L. Nashed | G. G. L. Nashed | Regularization of $f(T)$ gravity theories and local Lorentz
transformation | 12 pages | Advances in High Energy Physics, Volume 2015 (2015), Article ID
680457, 8 pages | 10.1155/2015/680457 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We regularized the field equations of $f(T)$ gravity theories such that the
effect of Local Lorentz Transformation (LLT), in the case of spherical
symmetry, is removed. A "general tetrad field", with an arbitrary function of
radial coordinate preserving spherical symmetry is provided. We split that
tetrad field into ... | [
{
"created": "Thu, 27 Mar 2014 07:45:20 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jan 2015 07:53:02 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Jul 2015 14:09:33 GMT",
"version": "v3"
}
] | 2015-07-21 | [
[
"Nashed",
"G. G. L.",
""
]
] | We regularized the field equations of $f(T)$ gravity theories such that the effect of Local Lorentz Transformation (LLT), in the case of spherical symmetry, is removed. A "general tetrad field", with an arbitrary function of radial coordinate preserving spherical symmetry is provided. We split that tetrad field into tw... |
0910.0102 | Balakin Alexander | A.B. Balakin and H. Dehnen | Accelerated expansion of the Universe driven by dynamic self-interaction | 9 pages, no figures, accepted for publication in Phys.Letters B | Phys.Lett.B681:113-117,2009 | 10.1016/j.physletb.2009.10.004 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish a new model, which takes into account a dynamic (inertial)
self-interaction of gravitating systems. The model is formulated by
introduction of a new function depending on the square of the covariant
derivative of the velocity four-vector of the system as a whole into the
Lagrangian. This term is meant fo... | [
{
"created": "Thu, 1 Oct 2009 07:55:16 GMT",
"version": "v1"
}
] | 2009-12-17 | [
[
"Balakin",
"A. B.",
""
],
[
"Dehnen",
"H.",
""
]
] | We establish a new model, which takes into account a dynamic (inertial) self-interaction of gravitating systems. The model is formulated by introduction of a new function depending on the square of the covariant derivative of the velocity four-vector of the system as a whole into the Lagrangian. This term is meant for ... |
1710.10763 | Yu-Hsiang Lin | Yu-Hsiang Lin | Initial Condition of the Inflationary Universe and Its Imprint on the
Cosmic Microwave Background | 129 pages, 32 figures, Ph.D. thesis at National Taiwan University,
June 2017 | null | 10.6342/NTU201701823 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is an apparent power deficit relative to the Lambda-CDM prediction of
the CMB spectrum at large scales, which, though not yet statistically
significant, persists from WMAP to Planck data. We first present a simple toy
model corresponding to a network of frustrated topological defects of domain
walls or cosmic s... | [
{
"created": "Mon, 30 Oct 2017 03:55:17 GMT",
"version": "v1"
}
] | 2017-10-31 | [
[
"Lin",
"Yu-Hsiang",
""
]
] | There is an apparent power deficit relative to the Lambda-CDM prediction of the CMB spectrum at large scales, which, though not yet statistically significant, persists from WMAP to Planck data. We first present a simple toy model corresponding to a network of frustrated topological defects of domain walls or cosmic str... |
gr-qc/9604006 | Julio Cesar Fabris | Julio C. Fabris and Joel Tossa | Scalar Perturbations and Conformal Transformation | Latex, 14 pages | Grav.Cosmol. 3 (1997) 165-171 | null | IC/95/379 | gr-qc | null | The non-minimal coupling of gravity to a scalar field can be transformed into
a minimal coupling through a conformal transformation. We show how to connect
the results of a perturbation calculation, performed around a
Friedmann-Robertson-Walker background solution, before and after the conformal
transformation. We wo... | [
{
"created": "Tue, 2 Apr 1996 17:03:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fabris",
"Julio C.",
""
],
[
"Tossa",
"Joel",
""
]
] | The non-minimal coupling of gravity to a scalar field can be transformed into a minimal coupling through a conformal transformation. We show how to connect the results of a perturbation calculation, performed around a Friedmann-Robertson-Walker background solution, before and after the conformal transformation. We work... |
2009.04572 | Mario Neves Junior | M. J. Neves, Everton M. C. Abreu, Jorge B. de Oliveira and Marcelo
Kesseles Gon\c{c}alves | Thermostatistical analysis for short-range interaction Potentials | 25 pages, 14 figures | International Journal of Geometric Methods in Modern Physics, vol
17, 2020 | 10.1142/S0219887820501935 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the thermodynamics of short-range central potentials,
namely, the Lee-Wick potential, and the Plasma potential. In the first part of
the paper we obtain the numerical solution for the orbits equation for these
potentials. Posteriorly, we introduce the thermodynamics through the
microcanonical ... | [
{
"created": "Wed, 9 Sep 2020 21:03:53 GMT",
"version": "v1"
}
] | 2020-09-11 | [
[
"Neves",
"M. J.",
""
],
[
"Abreu",
"Everton M. C.",
""
],
[
"de Oliveira",
"Jorge B.",
""
],
[
"Gonçalves",
"Marcelo Kesseles",
""
]
] | In this paper, we study the thermodynamics of short-range central potentials, namely, the Lee-Wick potential, and the Plasma potential. In the first part of the paper we obtain the numerical solution for the orbits equation for these potentials. Posteriorly, we introduce the thermodynamics through the microcanonical an... |
1309.4553 | Timoshkin Alexandr V | V.V. Obukhov, A.V. Timoshkin and E.V Savushkin | Rip Cosmology via Inhomogeneous Fluid | 107-113 | null | 10.3390/galaxies1020107 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conditions for the appearance of the Little Rip, Pseudo Rip and Quasi Rip
universes in the terms of the parameters in the equation of state of some dark
fluid are investigated. Several examples of the Rip cosmologies are
investigated.
| [
{
"created": "Wed, 18 Sep 2013 07:14:32 GMT",
"version": "v1"
}
] | 2013-09-19 | [
[
"Obukhov",
"V. V.",
""
],
[
"Timoshkin",
"A. V.",
""
],
[
"Savushkin",
"E. V",
""
]
] | The conditions for the appearance of the Little Rip, Pseudo Rip and Quasi Rip universes in the terms of the parameters in the equation of state of some dark fluid are investigated. Several examples of the Rip cosmologies are investigated. |
2105.07728 | Abhik Kumar Sanyal Dr. | Marcelo Byrro Ribeiro and Abhik Kumar Sanyal | Bianchi VI0 viscous fluid cosmology with magnetic field | 7 pages, 0 figures | Journal of Mathematical Physics 28, 657 (1987) | 10.1063/1.527599 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spatially homogeneous Bianchi type VI0 model containing a viscous fluid in
the presence of an axial magnetic field has been studied. A barotropic equation
of state together with a pair of linear relations among the square root of
matter density, shear scalar, and expansion scalar have been assumed. Solutions
are ob... | [
{
"created": "Mon, 17 May 2021 10:54:48 GMT",
"version": "v1"
}
] | 2021-05-18 | [
[
"Ribeiro",
"Marcelo Byrro",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | A spatially homogeneous Bianchi type VI0 model containing a viscous fluid in the presence of an axial magnetic field has been studied. A barotropic equation of state together with a pair of linear relations among the square root of matter density, shear scalar, and expansion scalar have been assumed. Solutions are obta... |
gr-qc/0512011 | Valentin Gladush | Valentin D. Gladush | A vacuum-like configuration in General Relativity as a manifestation of
a Lorentz-invariant mode of five-dimensional gravity | 24 pages, revtex | Int.J.Mod.Phys.D16:711-736,2007 | 10.1142/S0218271807009851 | null | gr-qc | null | A Lorentz-invariant cosmological model is constructed within the framework of
five-dimensional gravity. The five-dimensional theorem which is analogical to
the generalized Birkhoff theorem is proved, that corresponds to the Kaluza's
``cylinder condition''. The five-dimensional vacuum Einstein equations have an
integr... | [
{
"created": "Thu, 1 Dec 2005 12:41:52 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Gladush",
"Valentin D.",
""
]
] | A Lorentz-invariant cosmological model is constructed within the framework of five-dimensional gravity. The five-dimensional theorem which is analogical to the generalized Birkhoff theorem is proved, that corresponds to the Kaluza's ``cylinder condition''. The five-dimensional vacuum Einstein equations have an integral... |
1711.10475 | Kazuharu Bamba | Kazuharu Bamba, Davood Momeni and Mudhahir Al Ajmi | Phase Space description of Nonlocal Teleparallel Gravity | 14 pages, 3 figures, title changed, version accepted for publication
in European Physical Journal C | Eur.Phys.J. C78 (2018) no.9, 771 | 10.1140/epjc/s10052-018-6240-z | FU-PCG-23 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study cosmological solutions in nonlocal teleparallel gravity or $f(T)$
theory, where $T$ is the torsion scalar in teleparallel gravity. This is a
natural extenstion of the usual teleparallel gravity with nonlocal terms. In
this work the phase space portrait proposed to describe the dynamics of an
arbitrary flat, ... | [
{
"created": "Mon, 27 Nov 2017 13:27:43 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2018 06:45:30 GMT",
"version": "v2"
}
] | 2018-10-09 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Momeni",
"Davood",
""
],
[
"Ajmi",
"Mudhahir Al",
""
]
] | We study cosmological solutions in nonlocal teleparallel gravity or $f(T)$ theory, where $T$ is the torsion scalar in teleparallel gravity. This is a natural extenstion of the usual teleparallel gravity with nonlocal terms. In this work the phase space portrait proposed to describe the dynamics of an arbitrary flat, ho... |
gr-qc/0502016 | Claus Kiefer | Claus Kiefer | Quantum Cosmology and the Arrow of Time | 10 pages, contribution to the Proceedings of the conference DICE2004,
Piombino, Italy, September 2004 | Braz.J.Phys. 35 (2005) 296-299 | null | null | gr-qc | null | Although most fundamental laws are invariant under time reversal, experience
exhibits the presence of irreversible phenomena -- the arrows of time. Their
origin lies in cosmology, and I argue that only quantum cosmology can provide
the appropriate formal framework. After briefly reviewing the formalism, I
discuss how... | [
{
"created": "Thu, 3 Feb 2005 16:37:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kiefer",
"Claus",
""
]
] | Although most fundamental laws are invariant under time reversal, experience exhibits the presence of irreversible phenomena -- the arrows of time. Their origin lies in cosmology, and I argue that only quantum cosmology can provide the appropriate formal framework. After briefly reviewing the formalism, I discuss how a... |
1612.04823 | Shahar Hod | Shahar Hod | No-scalar-hair theorem for spherically symmetric reflecting stars | 6 pages | Physical Review D 94, 104073 (2016) | 10.1103/PhysRevD.94.104073 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is proved that spherically symmetric compact reflecting objects cannot
support static bound-state configurations made of scalar fields whose
self-interaction potential $V(\psi^2)$ is a monotonically increasing function
of its argument. Our theorem rules out, in particular, the existence of massive
scalar hair outs... | [
{
"created": "Wed, 14 Dec 2016 21:00:03 GMT",
"version": "v1"
}
] | 2017-04-27 | [
[
"Hod",
"Shahar",
""
]
] | It is proved that spherically symmetric compact reflecting objects cannot support static bound-state configurations made of scalar fields whose self-interaction potential $V(\psi^2)$ is a monotonically increasing function of its argument. Our theorem rules out, in particular, the existence of massive scalar hair outsid... |
1506.06478 | Nami Uchikata | Nami Uchikata and Shijun Yoshida | Slowly rotating regular black holes with a charged thin shell | 21 pages, 20 figures | Physical Review D 90, 064042 (2014) | 10.1103/PhysRevD.90.064042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain rotating solutions of regular black holes which are constructed of
de Sitter spacetime with the axisymmetric stationary perturbation within the
timelike charged thin shell and the Kerr-Newman geometry with sufficiently
small rotation outside the shell. To treat the slowly rotating thin shell, we
employ the ... | [
{
"created": "Mon, 22 Jun 2015 06:13:56 GMT",
"version": "v1"
}
] | 2015-07-01 | [
[
"Uchikata",
"Nami",
""
],
[
"Yoshida",
"Shijun",
""
]
] | We obtain rotating solutions of regular black holes which are constructed of de Sitter spacetime with the axisymmetric stationary perturbation within the timelike charged thin shell and the Kerr-Newman geometry with sufficiently small rotation outside the shell. To treat the slowly rotating thin shell, we employ the me... |
1004.0513 | Gregory J. Galloway | Piotr T. Chru\'sciel, Gregory J. Galloway | Uniqueness of static black-holes without analyticity | 6 pages, 1 figure | Class.Quant.Grav.27:152001,2010 | 10.1088/0264-9381/27/15/152001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the hypothesis of analyticity in the uniqueness theory of
vacuum, or electrovacuum, static black holes is not needed. More generally, we
show that prehorizons covering a closed set cannot occur in well-behaved
domains of outer communications.
| [
{
"created": "Sun, 4 Apr 2010 15:27:46 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Galloway",
"Gregory J.",
""
]
] | We show that the hypothesis of analyticity in the uniqueness theory of vacuum, or electrovacuum, static black holes is not needed. More generally, we show that prehorizons covering a closed set cannot occur in well-behaved domains of outer communications. |
1703.00543 | Qingdi Wang | Qingdi Wang, Zhen Zhu, William G. Unruh | How the huge energy of quantum vacuum gravitates to drive the slow
accelerating expansion of the Universe | 35 pages, 8 figures, PRD Editors' Suggestion | Phys. Rev. D 95, 103504 (2017) | 10.1103/PhysRevD.95.103504 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the gravitational property of the quantum vacuum by treating
its large energy density predicted by quantum field theory seriously and
assuming that it does gravitate to obey the equivalence principle of general
relativity. We find that the quantum vacuum would gravitate differently from
what people pre... | [
{
"created": "Wed, 1 Mar 2017 23:09:20 GMT",
"version": "v1"
},
{
"created": "Thu, 11 May 2017 21:12:33 GMT",
"version": "v2"
}
] | 2019-04-22 | [
[
"Wang",
"Qingdi",
""
],
[
"Zhu",
"Zhen",
""
],
[
"Unruh",
"William G.",
""
]
] | We investigate the gravitational property of the quantum vacuum by treating its large energy density predicted by quantum field theory seriously and assuming that it does gravitate to obey the equivalence principle of general relativity. We find that the quantum vacuum would gravitate differently from what people previ... |
gr-qc/0604111 | Amr Sid-Ahmed M. | Nabil L. Youssef and Amr M. Sid-Ahmed | Linear Connections and Curvature Tensors in the Geometry of
Parallelizable Manifolds | 16 pages LaTeX file, Changed title, Changed content, Added
references, Physical features stressed | Rept.Math.Phys.60:39-53,2007 | 10.1016/S0034-4877(07)00020-1 | null | gr-qc math.DG | null | In this paper we discuss curvature tensors in the context of Absolute
Parallelism geometry. Different curvature tensors are expressed in a compact
form in terms of the torsion tensor of the canonical connection. Using the
Bianchi identities some other identities are derived from the expressions
obtained. These identi... | [
{
"created": "Wed, 26 Apr 2006 12:44:02 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2007 18:23:05 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Youssef",
"Nabil L.",
""
],
[
"Sid-Ahmed",
"Amr M.",
""
]
] | In this paper we discuss curvature tensors in the context of Absolute Parallelism geometry. Different curvature tensors are expressed in a compact form in terms of the torsion tensor of the canonical connection. Using the Bianchi identities some other identities are derived from the expressions obtained. These identiti... |
gr-qc/0403040 | Sigbjorn Hervik | Sigbjorn Hervik | The Asymptotic Behaviour of Tilted Bianchi type VI$_0$ Universes | 22 pages, 4 figures, to appear in CQG | Class.Quant.Grav. 21 (2004) 2301-2317 | 10.1088/0264-9381/21/9/007 | DAMTP-2004-28 | gr-qc astro-ph | null | We study the asymptotic behaviour of the Bianchi type VI$_0$ universes with a
tilted $\gamma$-law perfect fluid. The late-time attractors are found for the
full 7-dimensional state space and for several interesting invariant subspaces.
In particular, it is found that for the particular value of the equation of
state ... | [
{
"created": "Tue, 9 Mar 2004 18:53:49 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Hervik",
"Sigbjorn",
""
]
] | We study the asymptotic behaviour of the Bianchi type VI$_0$ universes with a tilted $\gamma$-law perfect fluid. The late-time attractors are found for the full 7-dimensional state space and for several interesting invariant subspaces. In particular, it is found that for the particular value of the equation of state pa... |
1212.2197 | Mengjie Wang | Mengjie Wang, Marco O. P. Sampaio, Carlos Herdeiro | Hawking radiation for a Proca field in D dimensions II: charged field in
a brane charged black hole | 11 pages, 4 figures, matched to published version | Phys. Rev. D 87, 044011 (2013) | 10.1103/PhysRevD.87.044011 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalise our first analysis of the wave equation for a massive vector
boson in the background of a D-dimensional Schwarzschild black hole, by adding
charge both to the field and the black hole, on the 3+1 dimensional Standard
Model brane. A detailed numerical study is performed to obtain the transmission
factor ... | [
{
"created": "Mon, 10 Dec 2012 20:48:34 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2013 20:33:50 GMT",
"version": "v2"
}
] | 2013-02-27 | [
[
"Wang",
"Mengjie",
""
],
[
"Sampaio",
"Marco O. P.",
""
],
[
"Herdeiro",
"Carlos",
""
]
] | We generalise our first analysis of the wave equation for a massive vector boson in the background of a D-dimensional Schwarzschild black hole, by adding charge both to the field and the black hole, on the 3+1 dimensional Standard Model brane. A detailed numerical study is performed to obtain the transmission factor fo... |
1411.4716 | Jonathan Holland | Jonathan Holland and George Sparling | Cosmology: macro and micro | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new approach to cosmology and space-time is developed, which emphasizes the
description of the matter degrees of freedom of Einstein's theory of gravity by
a family of K\"ahler-Einstein Fano manifolds.
| [
{
"created": "Tue, 18 Nov 2014 01:59:07 GMT",
"version": "v1"
}
] | 2014-11-19 | [
[
"Holland",
"Jonathan",
""
],
[
"Sparling",
"George",
""
]
] | A new approach to cosmology and space-time is developed, which emphasizes the description of the matter degrees of freedom of Einstein's theory of gravity by a family of K\"ahler-Einstein Fano manifolds. |
gr-qc/0107011 | Tiberiu Harko | M. K. Mak, Peter N. Dobson Jr., T. Harko | Maximum Mass-Radius Ratios for Charged Compact General Relativistic
Objects | 6 pages, 2 figures, RevTex. To appear in Europhys. Lett | Europhys.Lett. 55 (2001) 310-316 | 10.1209/epl/i2001-00416-x | null | gr-qc | null | Upper limits for the mass-radius ratio and total charge are derived for
stable charged general relativistic matter distributions. For charged compact
objects the mass-radius ratio exceeds the value 4/9 corresponding to neutral
stars. General restrictions for the redshift and total energy (including the
gravitational ... | [
{
"created": "Wed, 4 Jul 2001 03:07:55 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Mak",
"M. K.",
""
],
[
"Dobson",
"Peter N.",
"Jr."
],
[
"Harko",
"T.",
""
]
] | Upper limits for the mass-radius ratio and total charge are derived for stable charged general relativistic matter distributions. For charged compact objects the mass-radius ratio exceeds the value 4/9 corresponding to neutral stars. General restrictions for the redshift and total energy (including the gravitational co... |
0911.2622 | Luca Fabbri | Luca Fabbri | Causal propagation for ELKO fields | 7 pages | Mod.Phys.Lett.A25:151-157,2010; Erratum-ibid A25:1295,2010;
Mod.Phys.Lett.A25:1295,2010 | 10.1142/S0217732310032408 10.1142/S0217732310033463 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We shall consider the general problem of causal propagation for spinor
fields, focus attention in particular on the case constituted by ELKO fields
and will show that the problem of causal propagation for ELKO fields is always
solvable.
| [
{
"created": "Fri, 13 Nov 2009 14:44:45 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2010 13:41:05 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Aug 2010 09:19:51 GMT",
"version": "v3"
},
{
"created": "Fri, 10 Sep 2010 07:25:18 GMT",
"version": "v4"
},
{
"c... | 2011-06-16 | [
[
"Fabbri",
"Luca",
""
]
] | We shall consider the general problem of causal propagation for spinor fields, focus attention in particular on the case constituted by ELKO fields and will show that the problem of causal propagation for ELKO fields is always solvable. |
gr-qc/0511053 | Zufar Murzakhanov | A.B. Balakin, Z.G. Murzakhanov (Kazan State U.), G.V. Kisun'ko
(Moscow, Creative Problems Dept.) | Radio Wave 'Messengers' of Periodic Gravitational Radiation and the
Problem of Gravitationally Induced Nonlinearity in Electrodynamic Systems | 5 pages, no figures | Phys.Dokl. 41 (1996) 331-333; Dokl.Akad.Nauk Ser.Fiz. 349 (1996)
326-328 | null | null | gr-qc | null | We discuss a gravitationally induced nonlinearity in hierarchic systems. We
consider the generation of extremely low-frequency radio waves with a frequency
of the periodic gravitational radiation; the generation is due to an induced
nonlinear self-action of electromagnetic radiation in the vicinity of the
gravitation... | [
{
"created": "Thu, 10 Nov 2005 10:52:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Balakin",
"A. B.",
"",
"Kazan State U."
],
[
"Murzakhanov",
"Z. G.",
"",
"Kazan State U."
],
[
"Kisun'ko",
"G. V.",
"",
"Moscow, Creative Problems Dept."
]
] | We discuss a gravitationally induced nonlinearity in hierarchic systems. We consider the generation of extremely low-frequency radio waves with a frequency of the periodic gravitational radiation; the generation is due to an induced nonlinear self-action of electromagnetic radiation in the vicinity of the gravitational... |
1311.1030 | Otari Sakhelashvili | Otari Sakhelashvili | 6D Standing Wave Braneworld with Ghost Scalar Fields | null | International Journal of Theoretical Physics: Volume 53, Issue 6
(2014), Page 1940-1946 | 10.1007/s10773-014-1999-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 6D braneworld with the phantom-like bulk scalar field is considered. We
demonstrate pure gravitational localization of scalar field zero modes on the
brane.
| [
{
"created": "Tue, 5 Nov 2013 12:28:00 GMT",
"version": "v1"
}
] | 2014-05-13 | [
[
"Sakhelashvili",
"Otari",
""
]
] | The 6D braneworld with the phantom-like bulk scalar field is considered. We demonstrate pure gravitational localization of scalar field zero modes on the brane. |
1801.05920 | Jieci Wang | Tonghua Liu, Jieci Wang, Jiliang Jing, Heng Fan | The influence of Unruh effect on quantum steering for accelerated
two-level detectors with different measurements | 18 pages, 3 figures | Annals of Physics 390, 334-344 (2018) | 10.1016/j.aop.2018.01.019 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of steering between two correlated Unruh-Dewitt
detectors when one of them locally interacts with external scalar field via
different quantifiers. We find that the quantum steering, either measured by
the entropic steering inequality or the Cavalcanti-Jones-Wiseman-Reid
inequality, is fragile un... | [
{
"created": "Thu, 18 Jan 2018 03:08:21 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Liu",
"Tonghua",
""
],
[
"Wang",
"Jieci",
""
],
[
"Jing",
"Jiliang",
""
],
[
"Fan",
"Heng",
""
]
] | We study the dynamics of steering between two correlated Unruh-Dewitt detectors when one of them locally interacts with external scalar field via different quantifiers. We find that the quantum steering, either measured by the entropic steering inequality or the Cavalcanti-Jones-Wiseman-Reid inequality, is fragile unde... |
1808.08638 | James Bardeen | James M. Bardeen | Interpreting the semi-classical stress-energy tensor in a Schwarzschild
background, implications for the information paradox | 27 pages, 5 figures. There is considerable overlap with
arXiv:1706.09204, but the analysis is based on more accurate data, and there
are substantial additions and deletions | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical results for the semi-classical stress-energy tensor outside the
horizon of a Schwarzschild black hole obtained in the 1980's and 1990's are re-
examined in order to better understand the origin of Hawking radiation and the
implications for the black hole information paradox. Polynomial fits to the
numerical... | [
{
"created": "Sun, 26 Aug 2018 22:55:38 GMT",
"version": "v1"
}
] | 2018-08-28 | [
[
"Bardeen",
"James M.",
""
]
] | Numerical results for the semi-classical stress-energy tensor outside the horizon of a Schwarzschild black hole obtained in the 1980's and 1990's are re- examined in order to better understand the origin of Hawking radiation and the implications for the black hole information paradox. Polynomial fits to the numerical r... |
1705.06621 | Siyuan Ma | Siyuan Ma | Uniform energy bound and Morawetz estimate for extreme components of
spin fields in the exterior of a slowly rotating Kerr black hole I: Maxwell
field | published version | Annales Henri Poincar\'e volume 21, 2020 | 10.1007/s00023-020-00884-7 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This first part of the series treats the Maxwell equations in the exterior of
a slowly rotating Kerr black hole. By performing a first-order differential
operator on each extreme Newman-Penrose (N-P) scalar in a Kinnersley tetrad,
the resulting equation and the Teukolsky master equation for the extreme N-P
component ... | [
{
"created": "Thu, 18 May 2017 14:38:49 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2017 12:53:21 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jan 2018 20:14:02 GMT",
"version": "v3"
},
{
"created": "Thu, 27 Aug 2020 14:28:20 GMT",
"version": "v4"
}
] | 2020-08-28 | [
[
"Ma",
"Siyuan",
""
]
] | This first part of the series treats the Maxwell equations in the exterior of a slowly rotating Kerr black hole. By performing a first-order differential operator on each extreme Newman-Penrose (N-P) scalar in a Kinnersley tetrad, the resulting equation and the Teukolsky master equation for the extreme N-P component ar... |
gr-qc/0501102 | Ghanashyam Date | Kinjal Banerjee and Ghanashyam Date | Discreteness Corrections to the Effective Hamiltonian of Isotropic Loop
Quantum Cosmology | Revtex4, 24 pages, 3 figures. In version 2, one reference and a para
pertaining to it are added. In the version 3, some typos are corrected and
remark 4 in section III is revised. Final version to appear in Class. Quantum
Grav | Class.Quant.Grav. 22 (2005) 2017-2033 | 10.1088/0264-9381/22/11/007 | IMSc/2005/01/01 | gr-qc astro-ph hep-th | null | One of the qualitatively distinct and robust implication of Loop Quantum
Gravity (LQG) is the underlying discrete structure. In the cosmological context
elucidated by Loop Quantum Cosmology (LQC), this is manifested by the
Hamiltonian constraint equation being a (partial) difference equation. One
obtains an effective... | [
{
"created": "Mon, 31 Jan 2005 13:44:00 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Feb 2005 12:42:30 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Mar 2005 07:21:42 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Banerjee",
"Kinjal",
""
],
[
"Date",
"Ghanashyam",
""
]
] | One of the qualitatively distinct and robust implication of Loop Quantum Gravity (LQG) is the underlying discrete structure. In the cosmological context elucidated by Loop Quantum Cosmology (LQC), this is manifested by the Hamiltonian constraint equation being a (partial) difference equation. One obtains an effective H... |
gr-qc/9906030 | Leonardo Fernandez-Jambrina | Leonardo Fernandez-Jambrina | Geodesic Completeness of Orthogonally Transitive Cylindrical Spacetimes | 9 pages, to appear in Journal of Mathematical Physics | J.Math.Phys. 40 (1999) 4028-4034 | 10.1063/1.532940 | null | gr-qc | null | In this paper a theorem is derived in order to provide a wide sufficient
condition for an orthogonally transitive cylindrical spacetime to be
singularity-free. The applicability of the theorem is tested on examples
provided by the literature that are known to have regular curvature invariants.
| [
{
"created": "Tue, 8 Jun 1999 12:52:52 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Fernandez-Jambrina",
"Leonardo",
""
]
] | In this paper a theorem is derived in order to provide a wide sufficient condition for an orthogonally transitive cylindrical spacetime to be singularity-free. The applicability of the theorem is tested on examples provided by the literature that are known to have regular curvature invariants. |
gr-qc/0610011 | Ettore Minguzzi | E. Minguzzi | Classical aspects of lightlike dimensional reduction | Latex2e, 28 pages, 3 figures, uses psfrag | Class.Quant.Grav.23:7085-7110,2006 | 10.1088/0264-9381/23/23/029 | null | gr-qc | null | Some aspects of lightlike dimensional reduction in flat spacetime are studied
with emphasis to classical applications. Among them the Galilean transformation
of shadows induced by inertial frame changes is studied in detail by proving
that, (i) the shadow of an object has the same shape in every
orthogonal-to-light s... | [
{
"created": "Tue, 3 Oct 2006 14:41:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Minguzzi",
"E.",
""
]
] | Some aspects of lightlike dimensional reduction in flat spacetime are studied with emphasis to classical applications. Among them the Galilean transformation of shadows induced by inertial frame changes is studied in detail by proving that, (i) the shadow of an object has the same shape in every orthogonal-to-light scr... |
2408.05091 | Yermek Aldabergenov | Andrea Addazi, Yermek Aldabergenov, Yifu Cai | Sound Speed Resonance of Gravitational Waves in Gauss-Bonnet-coupled
inflation | 8 pages, 4 figures | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate the occurrence of Sound Speed Resonances (SSR) in
Gauss-Bonnet-coupled inflation across a wide range of coupling functions and
parameters. After inflation, the damped oscillations of the inflaton around its
potential minimum induces damped oscillations of the sound speed of tensor
modes, leading to res... | [
{
"created": "Fri, 9 Aug 2024 14:33:15 GMT",
"version": "v1"
}
] | 2024-08-12 | [
[
"Addazi",
"Andrea",
""
],
[
"Aldabergenov",
"Yermek",
""
],
[
"Cai",
"Yifu",
""
]
] | We demonstrate the occurrence of Sound Speed Resonances (SSR) in Gauss-Bonnet-coupled inflation across a wide range of coupling functions and parameters. After inflation, the damped oscillations of the inflaton around its potential minimum induces damped oscillations of the sound speed of tensor modes, leading to reson... |
gr-qc/0505024 | Tomas Liko | Tomas Liko, Paul S. Wesson | An exact solution of the five-dimensional Einstein equations with
four-dimensional de Sitter-like expansion | 6 pages; to appear in Journal of Mathematical Physics; v2: reference
3 corrected | J.Math.Phys. 46 (2005) 062504 | 10.1063/1.1926168 | null | gr-qc | null | We present an exact solution to the Einstein field equations which is Ricci
and Riemann flat in five dimensions, but in four dimensions is a good model for
the early vacuum-dominated universe.
| [
{
"created": "Wed, 4 May 2005 22:53:05 GMT",
"version": "v1"
},
{
"created": "Sun, 8 May 2005 23:52:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Liko",
"Tomas",
""
],
[
"Wesson",
"Paul S.",
""
]
] | We present an exact solution to the Einstein field equations which is Ricci and Riemann flat in five dimensions, but in four dimensions is a good model for the early vacuum-dominated universe. |
1912.10859 | Daniel Boyanovsky | Nathan Herring, Daniel Boyanovsky, Andrew R. Zentner | Non-adiabatic cosmological production of ultra-light Dark Matter | Discussion on isocurvature perturbations. To appear in PRD | Phys. Rev. D 101, 083516 (2020) | 10.1103/PhysRevD.101.083516 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the non-adiabatic cosmological production of ultra light dark matter
(ULDM) under a minimal set of assumptions: a free ultra light real scalar as a
spectator field in its Bunch-Davies vacuum state during inflation and
instantaneous reheating into a radiation dominated era. For (ULDM) fields
minimally coupled... | [
{
"created": "Fri, 20 Dec 2019 14:56:52 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2020 22:07:32 GMT",
"version": "v2"
}
] | 2020-04-13 | [
[
"Herring",
"Nathan",
""
],
[
"Boyanovsky",
"Daniel",
""
],
[
"Zentner",
"Andrew R.",
""
]
] | We study the non-adiabatic cosmological production of ultra light dark matter (ULDM) under a minimal set of assumptions: a free ultra light real scalar as a spectator field in its Bunch-Davies vacuum state during inflation and instantaneous reheating into a radiation dominated era. For (ULDM) fields minimally coupled t... |
gr-qc/0609058 | Farid Ya. Khalili | F.Ya.Khalili | Quantum variational measurement in the next generation
gravitational-wave detectors | 12 pages, 4 figures; NSNS SNR estimates added; misprints corrected | Phys.Rev.D76:102002,2007 | 10.1103/PhysRevD.76.102002 | null | gr-qc | null | A relatively simple method of overcoming the Standard Quantum Limit in the
next-generation Advanced LIGO gravitational wave detector is considered. It is
based on the quantum variational measurement with a single short (a few tens of
meters) filter cavity. Estimates show that this method allows to reduce the
radiatio... | [
{
"created": "Fri, 15 Sep 2006 13:21:41 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2007 10:56:14 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Khalili",
"F. Ya.",
""
]
] | A relatively simple method of overcoming the Standard Quantum Limit in the next-generation Advanced LIGO gravitational wave detector is considered. It is based on the quantum variational measurement with a single short (a few tens of meters) filter cavity. Estimates show that this method allows to reduce the radiation ... |
1312.1546 | Sunil Maharaj | M. Govender, K. P. Reddy, S. D. Maharaj | The role of shear in dissipative gravitational collapse | 15 pages, To appear in Int. J. Mod. Phys. D | null | 10.1142/S0218271814500138 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the physics of a radiating star undergoing
dissipative collapse in the form of a radial heat flux. Our treatment clearly
demonstrates how the presence of shear affects the collapse process; we are in
a position to contrast the physical features of the collapsing sphere in the
presence of ... | [
{
"created": "Thu, 5 Dec 2013 13:55:43 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Govender",
"M.",
""
],
[
"Reddy",
"K. P.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | In this paper we investigate the physics of a radiating star undergoing dissipative collapse in the form of a radial heat flux. Our treatment clearly demonstrates how the presence of shear affects the collapse process; we are in a position to contrast the physical features of the collapsing sphere in the presence of sh... |
0906.2588 | Alberto Saa | Michele Ferraz Figueiro and Alberto Saa | Anisotropic singularities in modified gravity models | 6 pages, final version to appear in PRD | Phys.Rev.D80:063504,2009 | 10.1103/PhysRevD.80.063504 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the common singularities present in generic modified gravity
models governed by actions of the type $S=\int d^4x \sqrt{-g}f(R,\phi,X)$, with
$X= -{1/2}g^{ab}\partial_a\phi\partial_b\phi$, are essentially the same
anisotropic instabilities associated to the hypersurface $F(\phi)=0$ in the
case of a non-mi... | [
{
"created": "Mon, 15 Jun 2009 01:19:44 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2009 11:12:00 GMT",
"version": "v2"
}
] | 2009-09-24 | [
[
"Figueiro",
"Michele Ferraz",
""
],
[
"Saa",
"Alberto",
""
]
] | We show that the common singularities present in generic modified gravity models governed by actions of the type $S=\int d^4x \sqrt{-g}f(R,\phi,X)$, with $X= -{1/2}g^{ab}\partial_a\phi\partial_b\phi$, are essentially the same anisotropic instabilities associated to the hypersurface $F(\phi)=0$ in the case of a non-mini... |
gr-qc/0007009 | Janos Kannar | Janos Kannar | On Killing vectors in initial value problems for asymptotically flat
space-times | null | Class.Quant.Grav. 17 (2000) 4981-4990 | 10.1088/0264-9381/17/24/303 | null | gr-qc | null | The existence of symmetries in asymptotically flat space-times are studied
from the point of view of initial value problems. General necessary and
sufficient (implicit) conditions are given for the existence of Killing vector
fields in the asymptotic characteristic and in the hyperboloidal initial value
problem (both... | [
{
"created": "Fri, 7 Jul 2000 13:23:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kannar",
"Janos",
""
]
] | The existence of symmetries in asymptotically flat space-times are studied from the point of view of initial value problems. General necessary and sufficient (implicit) conditions are given for the existence of Killing vector fields in the asymptotic characteristic and in the hyperboloidal initial value problem (both o... |
1104.0858 | Alfredo Sandoval-Villalbazo | D. Brun-Battistini, A. Sandoval-Villalbazo and A. L. Garcia-Perciante | Maxwell-Cattaneo's equation and the stability of fluctuations in the
relativistic fluid | 9 pages, no figures. Typos corrected | null | null | null | gr-qc cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extended theories are widely used in the literature to describe the
relativistic fluid. The motivation for this is mostly due to the causality
issues allegedly present in the first order theories. However, the decay of
fluctuations in the system is also at stake when first order theories
\emph{that couple heat with a... | [
{
"created": "Tue, 5 Apr 2011 14:34:40 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2011 18:47:51 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Apr 2011 14:50:04 GMT",
"version": "v3"
}
] | 2011-04-13 | [
[
"Brun-Battistini",
"D.",
""
],
[
"Sandoval-Villalbazo",
"A.",
""
],
[
"Garcia-Perciante",
"A. L.",
""
]
] | Extended theories are widely used in the literature to describe the relativistic fluid. The motivation for this is mostly due to the causality issues allegedly present in the first order theories. However, the decay of fluctuations in the system is also at stake when first order theories \emph{that couple heat with acc... |
0908.0620 | Wolfgang Tichy | Wolfgang Tichy | A new numerical method to construct binary neutron star initial data | 18 pages, 8 figures, 1 table | Class.Quant.Grav.26:175018,2009 | 10.1088/0264-9381/26/17/175018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new numerical method for the generation of binary neutron star
initial data using a method along the lines of the the Wilson-Mathews or the
closely related conformal thin sandwich approach. Our method uses six different
computational domains, which include spatial infinity. Each domain has its own
coordi... | [
{
"created": "Wed, 5 Aug 2009 08:53:41 GMT",
"version": "v1"
}
] | 2010-12-02 | [
[
"Tichy",
"Wolfgang",
""
]
] | We present a new numerical method for the generation of binary neutron star initial data using a method along the lines of the the Wilson-Mathews or the closely related conformal thin sandwich approach. Our method uses six different computational domains, which include spatial infinity. Each domain has its own coordina... |
1810.09560 | Eugen Radu | Yves Brihaye, Carlos Herdeiro and Eugen Radu | The scalarised Schwarzschild-NUT spacetime | 12 pages, 6 figures; v2: references added | null | 10.1016/j.physletb.2018.11.022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been suggested that vacuum black holes of General Relativity
(GR) can become spontaneously scalarised when appropriate non-minimal couplings
to curvature invariants are considered. These models circumvent the standard
black hole no scalar hair theorems of GR, allowing both the standard GR
solutions an... | [
{
"created": "Mon, 22 Oct 2018 21:15:09 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Oct 2018 17:13:03 GMT",
"version": "v2"
}
] | 2018-11-21 | [
[
"Brihaye",
"Yves",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Radu",
"Eugen",
""
]
] | It has recently been suggested that vacuum black holes of General Relativity (GR) can become spontaneously scalarised when appropriate non-minimal couplings to curvature invariants are considered. These models circumvent the standard black hole no scalar hair theorems of GR, allowing both the standard GR solutions and ... |
1403.2122 | BingKan Xue | BingKan Xue, Edward Belbruno | Regularization of the big bang singularity with a time varying equation
of state $w > 1$ | minor changes to published version | Class.Quant.Grav. 31 (2014) 165002 | 10.1088/0264-9381/31/16/165002 | null | gr-qc astro-ph.CO hep-th math-ph math.DS math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical dynamics of the universe undergoing a transition from
contraction to expansion through a big bang singularity. The dynamics is
described by a system of differential equations for a set of physical
quantities, such as the scale factor $a$, the Hubble parameter $H$, the
equation of state paramete... | [
{
"created": "Mon, 10 Mar 2014 01:25:55 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Apr 2015 03:32:16 GMT",
"version": "v2"
}
] | 2015-04-14 | [
[
"Xue",
"BingKan",
""
],
[
"Belbruno",
"Edward",
""
]
] | We study the classical dynamics of the universe undergoing a transition from contraction to expansion through a big bang singularity. The dynamics is described by a system of differential equations for a set of physical quantities, such as the scale factor $a$, the Hubble parameter $H$, the equation of state parameter ... |
2006.12300 | Alfred Y. Shaikh | A.Y.Shaikh, A.S.Shaikh, K.S.Wankhade | Panoroma behaviour of Domain walls cosmological models in teleparallel
gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The work is devoted to LRS Bianchi I domain walls cosmological models within
the framework of teleparallel gravity using volumetric expansions laws for the
depiction model. The physical and kinematical properties are discussed. The
statefinder parameters are also analysed along with the jerk parameter and
cosmologica... | [
{
"created": "Fri, 19 Jun 2020 13:06:35 GMT",
"version": "v1"
}
] | 2020-06-23 | [
[
"Shaikh",
"A. Y.",
""
],
[
"Shaikh",
"A. S.",
""
],
[
"Wankhade",
"K. S.",
""
]
] | The work is devoted to LRS Bianchi I domain walls cosmological models within the framework of teleparallel gravity using volumetric expansions laws for the depiction model. The physical and kinematical properties are discussed. The statefinder parameters are also analysed along with the jerk parameter and cosmological ... |
1502.07005 | Vasilis Oikonomou | S. Nojiri, S.D. Odintsov, V.K. Oikonomou | A quantitative analysis of singular inflation with scalar-tensor and
modified gravity | Version accepted by PRD | null | 10.1103/PhysRevD.91.084059 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | 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
occurrence, with s... | [
{
"created": "Tue, 24 Feb 2015 23:31:40 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2015 17:37:54 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Nojiri",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | 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 occurrence, with spe... |
2104.09797 | Oleg Evnin | Oleg Evnin | Resonant Hamiltonian systems and weakly nonlinear dynamics in AdS
spacetimes | topical review for Clas. Quant. Grav; v2: slightly expanded, accepted
for publication | Class. Quant. Grav. 38 (2021) 203001 | 10.1088/1361-6382/ac1b46 | null | gr-qc hep-th math-ph math.AP math.MP | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Weakly nonlinear dynamics in anti-de Sitter (AdS) spacetimes is reviewed,
keeping an eye on the AdS instability conjecture and focusing on the resonant
approximation that accurately captures in a simplified form the long-term
evolution of small initial data. Topics covered include turbulent and regular
motion, dynami... | [
{
"created": "Tue, 20 Apr 2021 07:19:32 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Aug 2021 02:48:46 GMT",
"version": "v2"
}
] | 2021-09-24 | [
[
"Evnin",
"Oleg",
""
]
] | Weakly nonlinear dynamics in anti-de Sitter (AdS) spacetimes is reviewed, keeping an eye on the AdS instability conjecture and focusing on the resonant approximation that accurately captures in a simplified form the long-term evolution of small initial data. Topics covered include turbulent and regular motion, dynamica... |
1507.00973 | Aurel Bejancu | Aurel Bejancu | Kinematic Quantities and Raychaudhuri Equations in a $5D$ Universe | 27 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on some ideas emerged from the classical Kaluza-Klein theory, we
present a $5D$ universe as a product bundle over the $4D$ spacetime. This
enables us to introduce and study two categories of kinematic quantities
(expansions, shear, vorticity) in a $5D$ universe. One category is related to
the fourth dimension (... | [
{
"created": "Mon, 22 Jun 2015 07:48:12 GMT",
"version": "v1"
}
] | 2015-07-06 | [
[
"Bejancu",
"Aurel",
""
]
] | Based on some ideas emerged from the classical Kaluza-Klein theory, we present a $5D$ universe as a product bundle over the $4D$ spacetime. This enables us to introduce and study two categories of kinematic quantities (expansions, shear, vorticity) in a $5D$ universe. One category is related to the fourth dimension (ti... |
2310.19705 | Takuya Katagiri | Takuya Katagiri, Tact Ikeda, Vitor Cardoso | Parametrized Love numbers of non-rotating black holes | 25 pages, 4 figures, v2: minor corrections, accepted for publication
in PRD | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | A set of tidal Love numbers quantifies tidal deformation of compact objects
and is a detectable imprint in gravitational waves from inspiralling binary
systems. The measurement of black hole Love numbers allows to test strong-field
gravity. In this paper, we present a parametrized formalism to compute the Love
number... | [
{
"created": "Mon, 30 Oct 2023 16:32:11 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2024 05:41:44 GMT",
"version": "v2"
}
] | 2024-02-15 | [
[
"Katagiri",
"Takuya",
""
],
[
"Ikeda",
"Tact",
""
],
[
"Cardoso",
"Vitor",
""
]
] | A set of tidal Love numbers quantifies tidal deformation of compact objects and is a detectable imprint in gravitational waves from inspiralling binary systems. The measurement of black hole Love numbers allows to test strong-field gravity. In this paper, we present a parametrized formalism to compute the Love numbers ... |
1805.05513 | Jose Wadih Maluf Dr. | J. W. Maluf, J. F. da Rocha-Neto, S. C. Ulhoa, F. L. Carneiro | Variations of the Energy of Free Particles in the pp-Wave Spacetimes | 20 pages, 18 figures, further arguments supporting the localizability
of the gravitational energy are presented, published in Universe | Universe 2018, 4(7), 74 | 10.3390/universe4070074 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the action of exact plane gravitational waves, or pp-waves, on
free particles. The analysis is carried out by investigating the variations of
the geodesic trajectories of the particles, before and after the passage of the
wave. The initial velocities of the particles are non-vanishing. We evaluate
numeric... | [
{
"created": "Tue, 15 May 2018 01:17:21 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2018 13:10:32 GMT",
"version": "v2"
}
] | 2018-06-25 | [
[
"Maluf",
"J. W.",
""
],
[
"da Rocha-Neto",
"J. F.",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"Carneiro",
"F. L.",
""
]
] | We consider the action of exact plane gravitational waves, or pp-waves, on free particles. The analysis is carried out by investigating the variations of the geodesic trajectories of the particles, before and after the passage of the wave. The initial velocities of the particles are non-vanishing. We evaluate numerical... |
2001.07540 | Kamal Hajian | Kamal Hajian | Light speed memory as a local observable for soft hairs | 7 pages, published version | EPL, 136 (2021) 29001 | 10.1209/0295-5075/ac29f0 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Einstein observers in flat space-time are inertial observers which use light
to synchronize their clocks. For such observers, speed of light is a constant
by construction. However, one can use super-translations to change coordinates
from Einstein to BMS coordinates. From the point of view of BMS observers,
speed of ... | [
{
"created": "Tue, 21 Jan 2020 14:43:54 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2020 10:34:16 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Jul 2021 08:33:34 GMT",
"version": "v3"
},
{
"created": "Thu, 3 Feb 2022 16:14:59 GMT",
"version": "v4"
}
] | 2022-02-04 | [
[
"Hajian",
"Kamal",
""
]
] | Einstein observers in flat space-time are inertial observers which use light to synchronize their clocks. For such observers, speed of light is a constant by construction. However, one can use super-translations to change coordinates from Einstein to BMS coordinates. From the point of view of BMS observers, speed of li... |
1409.1818 | Maurizio Gasperini | M. Gasperini | The twin paradox in the presence of gravity | 5 pages, 2 figures. Published in Mod. Phys. Lett. A 29, 1450149
(2014) | Mod. Phys. Lett. A 29, 1450149 (2014) | 10.1142/S0217732314501491 | BA-TH/668-13 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conventional wisdom, based on kinematic (flat-space) intuition, tell us that
a static twin is aging faster than his traveling twin brother. However, such a
situation could be exactly inverted if the two twins are embedded in an
external gravitational field, and if the (dynamical) distortion of the
space-time geometry... | [
{
"created": "Fri, 5 Sep 2014 14:31:44 GMT",
"version": "v1"
}
] | 2014-09-08 | [
[
"Gasperini",
"M.",
""
]
] | Conventional wisdom, based on kinematic (flat-space) intuition, tell us that a static twin is aging faster than his traveling twin brother. However, such a situation could be exactly inverted if the two twins are embedded in an external gravitational field, and if the (dynamical) distortion of the space-time geometry, ... |
0905.3657 | Bibekananda Nayak jr | Bibekananda Nayak, Lambodar Prasad Singh | Brans-Dicke Theory and primordial black holes in Early Matter-Dominated
Era | 9 pages | null | 10.1007/s10773-011-1014-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that primordial black holes can be formed in the matter-dominated era
with gravity described by the Brans-Dicke theory. Considering an early
matter-dominated era between inflation and reheating, we found that the
primordial black holes formed during that era evaporate at a quicker than those
of early radiatio... | [
{
"created": "Fri, 22 May 2009 10:35:11 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2009 10:05:11 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Sep 2010 14:45:46 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Jun 2011 15:01:59 GMT",
"version": "v4"
}
] | 2012-01-20 | [
[
"Nayak",
"Bibekananda",
""
],
[
"Singh",
"Lambodar Prasad",
""
]
] | We show that primordial black holes can be formed in the matter-dominated era with gravity described by the Brans-Dicke theory. Considering an early matter-dominated era between inflation and reheating, we found that the primordial black holes formed during that era evaporate at a quicker than those of early radiation-... |
0803.2671 | Megan McClure | M. L. McClure, Kaem Anderson, Kirk Bardahl | Non-isolated dynamic black holes and white holes | To appear in Physical Review D | Phys.Rev.D77:104008,2008 | 10.1103/PhysRevD.77.104008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modifying the Kerr-Schild transformation used to generate black and white
hole spacetimes, new dynamic black and white holes are obtained using a
time-dependent Kerr-Schild scalar field. Physical solutions are found for black
holes that shrink with time and for white holes that expand with time. The
black hole spacet... | [
{
"created": "Tue, 18 Mar 2008 16:37:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"McClure",
"M. L.",
""
],
[
"Anderson",
"Kaem",
""
],
[
"Bardahl",
"Kirk",
""
]
] | Modifying the Kerr-Schild transformation used to generate black and white hole spacetimes, new dynamic black and white holes are obtained using a time-dependent Kerr-Schild scalar field. Physical solutions are found for black holes that shrink with time and for white holes that expand with time. The black hole spacetim... |
2307.12210 | Guangzhou Guo | Guangzhou Guo, Peng Wang, Houwen Wu, Haitang Yang | Scalarized Kerr-Newman Black Holes | v1:22pages, 4 figures; v2: 22pages, 4 figures, references added | null | null | CTP-SCU/2023018 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we construct scalarized rotating black holes within the
framework of Einstein-Maxwell-scalar models. These models incorporate
non-minimal couplings that can induce tachyonic instabilities, leading to the
spontaneous scalarization of Kerr-Newman (KN) black holes. By exploring the
domain of existence, we... | [
{
"created": "Sun, 23 Jul 2023 02:52:50 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2023 03:05:51 GMT",
"version": "v2"
}
] | 2023-08-02 | [
[
"Guo",
"Guangzhou",
""
],
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
],
[
"Yang",
"Haitang",
""
]
] | In this paper, we construct scalarized rotating black holes within the framework of Einstein-Maxwell-scalar models. These models incorporate non-minimal couplings that can induce tachyonic instabilities, leading to the spontaneous scalarization of Kerr-Newman (KN) black holes. By exploring the domain of existence, we o... |
2201.05210 | Anne Franzen | Jo\~ao L. Costa, Anne T. Franzen, and Jes\'us Oliver | Semilinear wave equations on accelerated expanding FLRW spacetimes | 15 pages, 4 figures | null | 10.1007/s00023-023-01319-9 | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify a large class of systems of semilinear wave equations, on fixed
accelerated expanding FLRW spacetimes, with nearly at spatial slices, for which
we prove small data future global well-posedness. The family of systems we
consider is large in the sense that, among other examples, it includes general
wave map... | [
{
"created": "Thu, 13 Jan 2022 21:00:03 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Costa",
"João L.",
""
],
[
"Franzen",
"Anne T.",
""
],
[
"Oliver",
"Jesús",
""
]
] | We identify a large class of systems of semilinear wave equations, on fixed accelerated expanding FLRW spacetimes, with nearly at spatial slices, for which we prove small data future global well-posedness. The family of systems we consider is large in the sense that, among other examples, it includes general wave maps,... |
1812.06966 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s} and Mubasher Jamil | String analog of Reissner-Nordstr\"om black holes cannot be overcharged | Accepted to appear in MPLA | Modern Physics Letters A 34 (2019) 1950248 | 10.1142/S0217732319502481 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we attempt to overcharge extremal and nearly extremal charged
black holes in string theory, known as the Garfinkle-Horowitz-Strominger
solution. We first show that extremal black holes cannot be overcharged
analogous to the case of Reissner-Nordstr\"{o}m black holes. Contrary to their
analogues in genera... | [
{
"created": "Sat, 15 Dec 2018 18:12:55 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jul 2019 13:53:13 GMT",
"version": "v2"
}
] | 2019-08-02 | [
[
"Düztaş",
"Koray",
""
],
[
"Jamil",
"Mubasher",
""
]
] | In this work we attempt to overcharge extremal and nearly extremal charged black holes in string theory, known as the Garfinkle-Horowitz-Strominger solution. We first show that extremal black holes cannot be overcharged analogous to the case of Reissner-Nordstr\"{o}m black holes. Contrary to their analogues in general ... |
2312.05683 | Joel Saavedra | Joaquin Housset, Joel F. Saavedra and Francisco Tello-Ortiz | Cosmological FLRW phase transitions and micro-structure under Kaniadakis
statistics | 11 pages, 4 figures. Accepted version at Physics Letter B | null | 10.1016/j.physletb.2024.138686 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This article is devoted to the study of the thermodynamics phase transitions
and critical phenomena of an FLRW cosmological model under the so-called
Kaniadakis's statistics. The equation of state is derived from the corrected
Friedmann field equations and the thermodynamics unified first law. This
reveals the existe... | [
{
"created": "Sat, 9 Dec 2023 21:15:20 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2024 13:30:29 GMT",
"version": "v2"
}
] | 2024-05-09 | [
[
"Housset",
"Joaquin",
""
],
[
"Saavedra",
"Joel F.",
""
],
[
"Tello-Ortiz",
"Francisco",
""
]
] | This article is devoted to the study of the thermodynamics phase transitions and critical phenomena of an FLRW cosmological model under the so-called Kaniadakis's statistics. The equation of state is derived from the corrected Friedmann field equations and the thermodynamics unified first law. This reveals the existenc... |
1512.02142 | Gray Reid | Gray D. Reid, Matthew W. Choptuik | Nonminimally coupled topological-defect boson stars: Static solutions | 17 pages, 24 figures | Phys. Rev. D 93, 044022 (2016) | 10.1103/PhysRevD.93.044022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider spherically symmetric static composite structures consisting of a
boson star and a global monopole, minimally or non-minimally coupled to the
general relativistic gravitational field. In the non-minimally coupled case,
Marunovic and Murkovic have shown that these objects, so-called boson D-stars,
can be s... | [
{
"created": "Mon, 7 Dec 2015 17:48:39 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2023 21:19:29 GMT",
"version": "v2"
}
] | 2023-08-09 | [
[
"Reid",
"Gray D.",
""
],
[
"Choptuik",
"Matthew W.",
""
]
] | We consider spherically symmetric static composite structures consisting of a boson star and a global monopole, minimally or non-minimally coupled to the general relativistic gravitational field. In the non-minimally coupled case, Marunovic and Murkovic have shown that these objects, so-called boson D-stars, can be suf... |
2103.14413 | Chen Lan | Chen Lan and Yan-Gang Miao | Gliner Vacuum, Self-consistent Theory of Ruppeiner Geometry for Regular
Black Holes | 23 pages, major revision, Published in EPJC | Eur. Phys. J. C (2022) 82:1152 | 10.1140/epjc/s10052-022-11123-0 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the view of the Gliner vacuum, we remove the deformations in the first law
of mechanics for regular black holes, where one part of deformations associated
with black hole mass will be absorbed into enthalpy or internal energy, and the
other part associated with parameters rather than mass will constitute a
natural... | [
{
"created": "Fri, 26 Mar 2021 11:50:24 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 2021 07:55:23 GMT",
"version": "v2"
},
{
"created": "Tue, 25 May 2021 01:16:53 GMT",
"version": "v3"
},
{
"created": "Sat, 9 Oct 2021 05:48:05 GMT",
"version": "v4"
},
{
"cre... | 2022-12-22 | [
[
"Lan",
"Chen",
""
],
[
"Miao",
"Yan-Gang",
""
]
] | In the view of the Gliner vacuum, we remove the deformations in the first law of mechanics for regular black holes, where one part of deformations associated with black hole mass will be absorbed into enthalpy or internal energy, and the other part associated with parameters rather than mass will constitute a natural $... |
gr-qc/9402043 | Riccardo Capovilla | Riccardo Capovilla and Octavio Obregon | No Quantum Super-Minisuperspace with $\Lambda \ne 0$ | 9 pages, LaTeX, CIEA-94-02 | Phys.Rev. D49 (1994) 6562-6565 | 10.1103/PhysRevD.49.6562 | null | gr-qc | null | We show that the quantum super-minisuperspace of N=1 supergravity with
$\Lambda \ne 0 $ has no non-trivial physical states for class A Bianchi models.
Hence, in super quantum cosmology, the vanishing of $\Lambda$ is a condition
for the existence of the universe. We argue that this result implies that in
full supergra... | [
{
"created": "Thu, 24 Feb 1994 17:38:17 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Capovilla",
"Riccardo",
""
],
[
"Obregon",
"Octavio",
""
]
] | We show that the quantum super-minisuperspace of N=1 supergravity with $\Lambda \ne 0 $ has no non-trivial physical states for class A Bianchi models. Hence, in super quantum cosmology, the vanishing of $\Lambda$ is a condition for the existence of the universe. We argue that this result implies that in full supergravi... |
1610.05965 | S. Sedigheh Hashemi | S. Sedigheh Hashemi and Nematollah Riazi | Vacuum $ f(R)$ thick brane solution with a Gaussian warp function | 14 pages, 6 figures | Annals of Physics 399 (2018) | 10.1016/j.aop.2018.10.010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work deals with $f(R)$ modified gravity in five dimensional space-time.
The Gaussian thick brane is shown to be an exact solution in the frame work of
$f(R)$ gravity in five dimensions with a bulk cosmological constant. Response
of the brane to gravitational fluctuations and concordance with the Starobinsky
mode... | [
{
"created": "Wed, 19 Oct 2016 11:39:33 GMT",
"version": "v1"
}
] | 2019-02-12 | [
[
"Hashemi",
"S. Sedigheh",
""
],
[
"Riazi",
"Nematollah",
""
]
] | This work deals with $f(R)$ modified gravity in five dimensional space-time. The Gaussian thick brane is shown to be an exact solution in the frame work of $f(R)$ gravity in five dimensions with a bulk cosmological constant. Response of the brane to gravitational fluctuations and concordance with the Starobinsky model ... |
1503.07755 | Romulus Breban | Romulus Breban | On spinless null propagation in five dimensional space-times with
approximate space-like Killing symmetry | 6 pages, Typos corrected | null | 10.1140/epjc/s10052-016-4337-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Five-dimensional (5D) space-time symmetry greatly facilitates how a 4D
observer perceives the propagation of a single spinless particle in a 5D
space-time. In particular, if the 5D geometry is independent of the fifth
coordinate then the 5D physics may be interpreted as 4D quantum mechanics. In
this work we address t... | [
{
"created": "Wed, 25 Mar 2015 15:05:45 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2015 09:36:53 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jul 2016 15:22:09 GMT",
"version": "v3"
}
] | 2016-09-21 | [
[
"Breban",
"Romulus",
""
]
] | Five-dimensional (5D) space-time symmetry greatly facilitates how a 4D observer perceives the propagation of a single spinless particle in a 5D space-time. In particular, if the 5D geometry is independent of the fifth coordinate then the 5D physics may be interpreted as 4D quantum mechanics. In this work we address the... |
1106.4626 | Ritabrata Biswas | Ritabrata Biswas, Nairwita Mazumder, Subenoy Chakraborty | Interacting Holographic Dark Energy Model as a Dynamical system and the
Coincidence Problem | 7 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the evolution of a holographic cosmological model with future
event horizon as the infrared cut-off and dark matter and dark energy do not
evolve independently $-$ there is interaction between them. The basic evolution
equations are reduced to an autonomous system and corresponding phase space is
analyzed.... | [
{
"created": "Thu, 23 Jun 2011 05:01:59 GMT",
"version": "v1"
}
] | 2011-06-24 | [
[
"Biswas",
"Ritabrata",
""
],
[
"Mazumder",
"Nairwita",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | We examine the evolution of a holographic cosmological model with future event horizon as the infrared cut-off and dark matter and dark energy do not evolve independently $-$ there is interaction between them. The basic evolution equations are reduced to an autonomous system and corresponding phase space is analyzed. |
2211.02931 | P. A. Gonzalez | Ram\'on B\'ecar, P. A. Gonz\'alez, Yerko V\'asquez | Charged scalar field perturbations in Ernst black holes | 14 pages and 7 figures. arXiv admin note: text overlap with
arXiv:gr-qc/0211035 by other authors | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the propagation of a charged massive scalar field in the
background of a four-dimensional Ernst black hole and study its stability
analyzing the quasinormal modes (QNMs), which are calculated using the
semi-analytical Wentzel-Kramers-Brillouin method and numerically using the
continued fraction method. Ma... | [
{
"created": "Sat, 5 Nov 2022 15:50:22 GMT",
"version": "v1"
}
] | 2022-11-08 | [
[
"Bécar",
"Ramón",
""
],
[
"González",
"P. A.",
""
],
[
"Vásquez",
"Yerko",
""
]
] | We consider the propagation of a charged massive scalar field in the background of a four-dimensional Ernst black hole and study its stability analyzing the quasinormal modes (QNMs), which are calculated using the semi-analytical Wentzel-Kramers-Brillouin method and numerically using the continued fraction method. Main... |
gr-qc/0111048 | Serge Winitzki | Serge Winitzki | The eternal fractal in the universe | Conversion to RevTeX4; minor changes; version accepted by Phys. Rev.
D | Phys.Rev. D65 (2002) 083506 | 10.1103/PhysRevD.65.083506 | null | gr-qc astro-ph | null | Models of eternal inflation predict a stochastic self-similar geometry of the
universe at very large scales and allow existence of points that never
thermalize. I explore the fractal geometry of the resulting spacetime, using
coordinate-independent quantities. The formalism of stochastic inflation can be
used to obta... | [
{
"created": "Thu, 15 Nov 2001 20:50:15 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2002 18:07:09 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Winitzki",
"Serge",
""
]
] | Models of eternal inflation predict a stochastic self-similar geometry of the universe at very large scales and allow existence of points that never thermalize. I explore the fractal geometry of the resulting spacetime, using coordinate-independent quantities. The formalism of stochastic inflation can be used to obtain... |
gr-qc/0101114 | Yousuke Itoh | Yousuke Itoh (1), Toshifumi Futamase (1), Hideki Asada (2) ((1) Tohoku
University, (2) Hirosaki University) | Equation of motion for relativistic compact binaries with the strong
field point particle limit : the second and half post-Newtonian order | 48 pages, revtex, accepted for publication in Phys. Rev. D | Phys.Rev.D63:064038,2001 | 10.1103/PhysRevD.63.064038 | null | gr-qc | null | We study the equation of motion appropriate to an inspiralling binary star
system whose constituent stars have strong internal gravity. We use the
post-Newtonian approximation with the strong field point particle limit by
which we can introduce into general relativity a notion of a point-like
particle with strong int... | [
{
"created": "Tue, 30 Jan 2001 04:49:44 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Itoh",
"Yousuke",
""
],
[
"Futamase",
"Toshifumi",
""
],
[
"Asada",
"Hideki",
""
]
] | We study the equation of motion appropriate to an inspiralling binary star system whose constituent stars have strong internal gravity. We use the post-Newtonian approximation with the strong field point particle limit by which we can introduce into general relativity a notion of a point-like particle with strong inter... |
0910.1321 | Michael Martin Nieto | Michael Martin Nieto and John D. Anderson | Earth Flyby Anomalies | 5 pagea 3 figures | Physics Today {\bf 62} (No. 10 Oct.), 76-77 (2009) | 10.1063/1.3248495 | LA-UR-09-04811 | gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a reference frame fixed to the solar system's center of mass, a
satellite's energy will change as it is deflected by a planet. But a number of
satellites flying by Earth have also experienced energy changes in the
Earth-centered frame -- and that's a mystery.
| [
{
"created": "Wed, 7 Oct 2009 17:11:30 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Nieto",
"Michael Martin",
""
],
[
"Anderson",
"John D.",
""
]
] | In a reference frame fixed to the solar system's center of mass, a satellite's energy will change as it is deflected by a planet. But a number of satellites flying by Earth have also experienced energy changes in the Earth-centered frame -- and that's a mystery. |
1806.07639 | Roberto Casadio | R. Casadio, M. Lenzi, O. Micu | Bootstrapping Newton Gravity | 23 pages, 20 plots. New section and appendix about stability and the
pressure clarify comparison with GR. Conclusions rewritten to make
motivations clearer | Phys. Rev. D 98, 104016 (2018) | 10.1103/PhysRevD.98.104016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A non-linear equation obtained by adding gravitational self-interaction terms
to the Poisson equation for Newtonian gravity is here employed in order to
analyse a static spherically sym- metric homogeneous compact source of given
proper mass and radius and the outer vacuum. The main feature of this picture
is that, a... | [
{
"created": "Wed, 20 Jun 2018 09:46:07 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Oct 2018 15:26:40 GMT",
"version": "v2"
}
] | 2018-11-21 | [
[
"Casadio",
"R.",
""
],
[
"Lenzi",
"M.",
""
],
[
"Micu",
"O.",
""
]
] | A non-linear equation obtained by adding gravitational self-interaction terms to the Poisson equation for Newtonian gravity is here employed in order to analyse a static spherically sym- metric homogeneous compact source of given proper mass and radius and the outer vacuum. The main feature of this picture is that, alt... |
gr-qc/0201073 | Pio J. Arias | Victor Varela (Universidad Central de Venezuela) | Construction of Sources for Majumdar-Papapetrou Spacetimes | 15 pages, LaTeX | Gen.Rel.Grav. 35 (2003) 1815-1831 | 10.1023/A:1026014114308 | null | gr-qc | null | We study Majumdar-Papapetrou solutions for the 3+1 Einstein-Maxwell
equations, with charged dust acting as the external source for the fields. The
spherically symmetric solution of G\"{u}rses is considered in detail. We
introduce new parameters that simplify the construction of class $C^1$,
singularity-free geometrie... | [
{
"created": "Tue, 22 Jan 2002 06:25:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Varela",
"Victor",
"",
"Universidad Central de Venezuela"
]
] | We study Majumdar-Papapetrou solutions for the 3+1 Einstein-Maxwell equations, with charged dust acting as the external source for the fields. The spherically symmetric solution of G\"{u}rses is considered in detail. We introduce new parameters that simplify the construction of class $C^1$, singularity-free geometries.... |
2108.02462 | Davide Gerosa | Christopher J. Moore and Davide Gerosa | Population-informed priors in gravitational-wave astronomy | 11 pages, 5 figures + supplementary material | Phys. Rev. D 104, 083008 (2021) | 10.1103/PhysRevD.104.083008 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a Bayesian formalism for analyzing individual gravitational-wave
events in light of the rest of an observed population. This analysis reveals
how the idea of a "population-informed prior" arises naturally from a suitable
marginalization of an underlying hierarchical Bayesian model which consistently
accou... | [
{
"created": "Thu, 5 Aug 2021 09:04:21 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Nov 2021 09:48:44 GMT",
"version": "v2"
}
] | 2021-11-11 | [
[
"Moore",
"Christopher J.",
""
],
[
"Gerosa",
"Davide",
""
]
] | We describe a Bayesian formalism for analyzing individual gravitational-wave events in light of the rest of an observed population. This analysis reveals how the idea of a "population-informed prior" arises naturally from a suitable marginalization of an underlying hierarchical Bayesian model which consistently account... |
gr-qc/0006079 | Ken-ichi Nakao | Ken-ichi Nakao, Tomohiro Harada, Masaru Shibata, Seiji Kawamura and
Takashi Nakamura | Response of Interferometric Detectors to Scalar Gravitational Waves | 20 pages, 7 figures | Phys.Rev.D63:082001,2001 | 10.1103/PhysRevD.63.082001 | OCU-PHYS-175, WU-AP/101/00 | gr-qc | null | We rigorously analyze the frequency response functions and antenna
sensitivity patterns of three types of interferometric detectors to scalar mode
of gravitational waves which is predicted to exist in the scalar-tensor theory
of gravity. By a straightforward treatment, we show that the antenna
sensitivity pattern of ... | [
{
"created": "Thu, 22 Jun 2000 02:44:56 GMT",
"version": "v1"
}
] | 2009-12-31 | [
[
"Nakao",
"Ken-ichi",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Shibata",
"Masaru",
""
],
[
"Kawamura",
"Seiji",
""
],
[
"Nakamura",
"Takashi",
""
]
] | We rigorously analyze the frequency response functions and antenna sensitivity patterns of three types of interferometric detectors to scalar mode of gravitational waves which is predicted to exist in the scalar-tensor theory of gravity. By a straightforward treatment, we show that the antenna sensitivity pattern of th... |
1707.08056 | Jessie Durk | Jessie Durk, Timothy Clifton | A Quasi-Static Approach to Structure Formation in Black Hole Universes | 33 pages, 10 figures, v2: matches published version, typos corrected | JCAP 10 (2017) 012 | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the existence of hierarchies of structure in the Universe, we
present four new families of exact initial data for inhomogeneous cosmological
models at their maximum of expansion. These data generalise existing black hole
lattice models to situations that contain clusters of masses, and hence allow
the co... | [
{
"created": "Tue, 25 Jul 2017 15:52:27 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Oct 2017 17:13:52 GMT",
"version": "v2"
}
] | 2017-10-20 | [
[
"Durk",
"Jessie",
""
],
[
"Clifton",
"Timothy",
""
]
] | Motivated by the existence of hierarchies of structure in the Universe, we present four new families of exact initial data for inhomogeneous cosmological models at their maximum of expansion. These data generalise existing black hole lattice models to situations that contain clusters of masses, and hence allow the cons... |
1306.5063 | Avirup Ghosh | Olaf Dreyer, Amit Ghosh, Avirup Ghosh | Entropy from near-horizon geometries of Killing horizons | 8 pages, no figures | Phys. Rev. D 89, 024035 (2014) | 10.1103/PhysRevD.89.024035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive black hole entropy based on the near-horizon symmetries of black
hole space-times. To derive these symmetries we make use of an $(R,T)$-plane
close to a Killing horizon. We identify a set of vector fields that preserves
this plane and forms a Witt algebra. The corresponding algebra of Hamiltonians
is shown ... | [
{
"created": "Fri, 21 Jun 2013 07:09:44 GMT",
"version": "v1"
}
] | 2014-02-04 | [
[
"Dreyer",
"Olaf",
""
],
[
"Ghosh",
"Amit",
""
],
[
"Ghosh",
"Avirup",
""
]
] | We derive black hole entropy based on the near-horizon symmetries of black hole space-times. To derive these symmetries we make use of an $(R,T)$-plane close to a Killing horizon. We identify a set of vector fields that preserves this plane and forms a Witt algebra. The corresponding algebra of Hamiltonians is shown to... |
2205.00297 | Tiberiu Harko | Tiberiu Harko, Eniko J. Madarassy | Bose-Einstein Condensate dark matter models in the presence of baryonic
matter and random confining potentials | 29 pages, 15 figures, accepted for publication in EPJC | null | 10.1140/epjc/s10052-022-10344-7 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the effects of an uncorrelated random potential on the properties
of Bose-Einstein Condensate (BEC) dark matter halos, which acts as a source of
disorder, and which is added as a new term in the Gross-Pitaevskii equation,
describing the properties of the halo. By using the hydrodynamic representation
we d... | [
{
"created": "Sat, 30 Apr 2022 15:48:59 GMT",
"version": "v1"
}
] | 2022-05-18 | [
[
"Harko",
"Tiberiu",
""
],
[
"Madarassy",
"Eniko J.",
""
]
] | We consider the effects of an uncorrelated random potential on the properties of Bose-Einstein Condensate (BEC) dark matter halos, which acts as a source of disorder, and which is added as a new term in the Gross-Pitaevskii equation, describing the properties of the halo. By using the hydrodynamic representation we der... |
1908.07171 | Dipanjan Dey | Parth Bambhaniya, Ashok B. Joshi, Dipanjan Dey, Pankaj S. Joshi | Timelike geodesics in Naked Singularity and Black Hole Spacetimes | 14 pages, 18 figures | Phys. Rev. D 100, 124020 (2019) | 10.1103/PhysRevD.100.124020 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we derive the solutions of orbit equations for a class of
naked singularity spacetimes, and compare these with timelike orbits, that is,
particle trajectories in the Schwarzschild black hole spacetime. The
Schwarzschild and naked singularity spacetimes considered here can be formed as
end state of a sp... | [
{
"created": "Tue, 20 Aug 2019 05:34:51 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Bambhaniya",
"Parth",
""
],
[
"Joshi",
"Ashok B.",
""
],
[
"Dey",
"Dipanjan",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | In this paper, we derive the solutions of orbit equations for a class of naked singularity spacetimes, and compare these with timelike orbits, that is, particle trajectories in the Schwarzschild black hole spacetime. The Schwarzschild and naked singularity spacetimes considered here can be formed as end state of a sphe... |
1707.07457 | Ana Alonso-Serrano | Ana Alonso-Serrano (Charles University of Prague) and Matt Visser
(Victoria University of Wellington) | Entropy budget for Hawking evaporation | Proceedings of the conference "VARCOSMOFUN'16" in Szczecin, Poland,
12-17 September, 2016. Accepted for publication in "Universe", belonging to
the Special Issue "Varying Constants and Fundamental Cosmology" | Universe 2017, 3(3), 58 | 10.1016/j.physletb.2017.11.020 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Blackbody radiation, emitted from a furnace and described by a Planck
spectrum, contains (on average) an entropy of $3.9\pm 2.5$ bits per photon.
Since normal physical burning is a unitary process, this amount of entropy is
compensated by the same amount of "hidden information" in correlations between
the photons. Th... | [
{
"created": "Mon, 24 Jul 2017 09:50:52 GMT",
"version": "v1"
}
] | 2018-02-01 | [
[
"Alonso-Serrano",
"Ana",
"",
"Charles University of Prague"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Blackbody radiation, emitted from a furnace and described by a Planck spectrum, contains (on average) an entropy of $3.9\pm 2.5$ bits per photon. Since normal physical burning is a unitary process, this amount of entropy is compensated by the same amount of "hidden information" in correlations between the photons. The ... |
2007.06333 | Xiao-Xiong Zeng | Xiao-Xiong Zeng, Hai-Qing Zhang | Influence of quintessence dark energy on the shadow of black hole | references added | null | 10.1140/epjc/s10052-020-08656-7 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the effects of quintessence dark energy on the shadows of
black hole, surrounded by various profiles of accretions. For the thin disk
accretion, the images of the black hole comprises the dark region and bright
region, including direct emission, lensing rings and photon rings. Although
their details de... | [
{
"created": "Mon, 13 Jul 2020 12:06:05 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 2020 02:27:46 GMT",
"version": "v2"
}
] | 2020-12-02 | [
[
"Zeng",
"Xiao-Xiong",
""
],
[
"Zhang",
"Hai-Qing",
""
]
] | We investigate the effects of quintessence dark energy on the shadows of black hole, surrounded by various profiles of accretions. For the thin disk accretion, the images of the black hole comprises the dark region and bright region, including direct emission, lensing rings and photon rings. Although their details depe... |
gr-qc/9812052 | O. B. Zaslavskii | O.B. Zaslavskii (Department of Physics, Kharkov Karazin's National
University) | Nonextreme black holes near the extreme state and acceleration horizons:
thermodynamics and quantum-corrected geometry | 27 pages, REVTeX 3.0. Expanded from previous version. Title somewhat
changed. Qualitative explanation of effects of strong quantum backreaction on
geometry suggested in terms of induced cosmological constant. Stressed that
if this constant is positive, solutions found can be considered as quantum
versions of ch... | Class.Quant.Grav. 17 (2000) 497-512 | 10.1088/0264-9381/17/2/315 | null | gr-qc hep-th | null | We consider the class of metrics that can be obtained from those of
nonextreme black holes by limiting transitions to the extreme state such that
the near-horizon geometry expands into a whole manifold. These metrics include,
in particular, the Rindler and Bertotti - Robinson spacetimes. The general
formula for the e... | [
{
"created": "Tue, 15 Dec 1998 23:09:18 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Feb 1999 18:18:42 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Jul 1999 08:29:15 GMT",
"version": "v3"
},
{
"created": "Wed, 24 Nov 1999 11:36:04 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Zaslavskii",
"O. B.",
"",
"Department of Physics, Kharkov Karazin's National\n University"
]
] | We consider the class of metrics that can be obtained from those of nonextreme black holes by limiting transitions to the extreme state such that the near-horizon geometry expands into a whole manifold. These metrics include, in particular, the Rindler and Bertotti - Robinson spacetimes. The general formula for the ent... |
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