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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0102086 | Garcia | L.C.Garcia de Andrade | Torsion Strings inside Static Black Holes in Teleparallel Gravity | Latex file | null | null | null | gr-qc | null | Cosmic strings inside Schwarzschild black holes in teleparallel gravity are
considered.Torsion flux inside the black hole is compute like a torsion vortex
on a superfluid.Since some components of torsion are singular on Schwarzschild
horizon and others remain finite we compute a torsion invariant to decide
whether th... | [
{
"created": "Tue, 20 Feb 2001 16:49:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | Cosmic strings inside Schwarzschild black holes in teleparallel gravity are considered.Torsion flux inside the black hole is compute like a torsion vortex on a superfluid.Since some components of torsion are singular on Schwarzschild horizon and others remain finite we compute a torsion invariant to decide whether the ... |
2207.11772 | Yong Cai | Yong Cai, Ji Xu, Shuai Zhao, Siyi Zhou | Perturbative unitarity and NEC violation in genesis cosmology | 32 pages, 5 figures; updated to match the published version | JHEP10(2022)140 | 10.1007/JHEP10(2022)140 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Explorations of the violation of null energy condition (NEC) in cosmology
could enrich our understanding of the very early universe and the related
gravity theories. Although a fully stable NEC violation can be realized in the
``beyond Horndeski'' theory, it remains an open question whether a violation of
the NEC is ... | [
{
"created": "Sun, 24 Jul 2022 16:54:47 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Oct 2022 14:40:28 GMT",
"version": "v2"
}
] | 2022-10-24 | [
[
"Cai",
"Yong",
""
],
[
"Xu",
"Ji",
""
],
[
"Zhao",
"Shuai",
""
],
[
"Zhou",
"Siyi",
""
]
] | Explorations of the violation of null energy condition (NEC) in cosmology could enrich our understanding of the very early universe and the related gravity theories. Although a fully stable NEC violation can be realized in the ``beyond Horndeski'' theory, it remains an open question whether a violation of the NEC is al... |
1009.3674 | Jorge I. Ovalle A. | J. Ovalle | The Schwarzschild's Braneworld Solution | 17 pages, accepted in Modern Physics Letters A | Mod.Phys.Lett.A25:3323-3334,2010 | 10.1142/S0217732310034420 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the Randall-Sundrum braneworld, the minimal geometric
deformation approach, which has been successfully used to generate exact
interior solutions to Einstein's field equations for static braneworld stars
with local and non-local bulk terms, is used to obtain the braneworld version
of the Schwarzschi... | [
{
"created": "Mon, 20 Sep 2010 01:00:25 GMT",
"version": "v1"
}
] | 2010-12-09 | [
[
"Ovalle",
"J.",
""
]
] | In the context of the Randall-Sundrum braneworld, the minimal geometric deformation approach, which has been successfully used to generate exact interior solutions to Einstein's field equations for static braneworld stars with local and non-local bulk terms, is used to obtain the braneworld version of the Schwarzschild... |
1004.5322 | Neil J. Cornish | Neil J. Cornish and Joey Shapiro Key | Computing waveforms for spinning compact binaries in quasi-eccentric
orbits | 11 pages, introduction and references updated | Phys.Rev.D82:044028,2010; Erratum-ibid.D84:029901,2011 | 10.1103/PhysRevD.82.044028 10.1103/PhysRevD.84.029901 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several scenarios have been proposed in which the orbits of binary black
holes enter the band of a gravitational wave detector with significant
eccentricity. To avoid missing these signals or biasing parameter estimation it
is important that we consider waveform models that account for eccentricity.
The ingredients n... | [
{
"created": "Thu, 29 Apr 2010 15:23:35 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2010 15:15:28 GMT",
"version": "v2"
},
{
"created": "Mon, 10 May 2010 21:46:05 GMT",
"version": "v3"
},
{
"created": "Fri, 9 Jul 2010 03:58:42 GMT",
"version": "v4"
}
] | 2015-03-17 | [
[
"Cornish",
"Neil J.",
""
],
[
"Key",
"Joey Shapiro",
""
]
] | Several scenarios have been proposed in which the orbits of binary black holes enter the band of a gravitational wave detector with significant eccentricity. To avoid missing these signals or biasing parameter estimation it is important that we consider waveform models that account for eccentricity. The ingredients nee... |
0806.1769 | Claus Gerhardt | Claus Gerhardt | Quantum cosmological Friedman models with an initial singularity | 35 pages, v7: Introduction rewritten and and a comparison with the
classical solutions added. This will be the published version | Class.Quant.Grav.26:015001,2009 | 10.1088/0264-9381/26/1/015001 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Wheeler-DeWitt equation $H\psi=0$ in a suitable Hilbert
space. It turns out that this equation has countably many solutions $\psi_i$
which can be considered as eigenfunctions of a Hamilton operator implicitly
defined by $H$. We consider two models, a bounded one, $0<r<r_0$, and an
unbounded, $0<r<\un$... | [
{
"created": "Wed, 11 Jun 2008 14:51:49 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2008 12:25:06 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Jun 2008 18:07:45 GMT",
"version": "v3"
},
{
"created": "Wed, 25 Jun 2008 17:28:00 GMT",
"version": "v4"
},
{
"c... | 2009-02-09 | [
[
"Gerhardt",
"Claus",
""
]
] | We consider the Wheeler-DeWitt equation $H\psi=0$ in a suitable Hilbert space. It turns out that this equation has countably many solutions $\psi_i$ which can be considered as eigenfunctions of a Hamilton operator implicitly defined by $H$. We consider two models, a bounded one, $0<r<r_0$, and an unbounded, $0<r<\un$, ... |
2209.12584 | Misba Afrin | Misba Afrin, Sunny Vagnozzi and Sushant G. Ghosh | Tests of Loop Quantum Gravity from the Event Horizon Telescope Results
of Sgr A$^*$ | 15 pages, 6 figures, 2 tables. Matched to the published version | Astrophys. J. 944 (2023) 149 | 10.3847/1538-4357/acb334 | null | gr-qc astro-ph.GA hep-th | http://creativecommons.org/licenses/by/4.0/ | The Event Horizon Telescope (EHT) collaboration's image of the compact object
at the galactic center is the first direct evidence of the supermassive black
hole (BH) Sgr A$^*$. The shadow of Sgr A$^*$ has an angular diameter $d_{sh}=
48.7 \pm 7\,\mu$as with fractional deviation from the Schwarzschild BH shadow
diamet... | [
{
"created": "Mon, 26 Sep 2022 10:57:13 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Sep 2022 11:03:07 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jan 2023 11:24:55 GMT",
"version": "v3"
},
{
"created": "Thu, 23 Feb 2023 12:46:28 GMT",
"version": "v4"
}
] | 2023-02-24 | [
[
"Afrin",
"Misba",
""
],
[
"Vagnozzi",
"Sunny",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | The Event Horizon Telescope (EHT) collaboration's image of the compact object at the galactic center is the first direct evidence of the supermassive black hole (BH) Sgr A$^*$. The shadow of Sgr A$^*$ has an angular diameter $d_{sh}= 48.7 \pm 7\,\mu$as with fractional deviation from the Schwarzschild BH shadow diameter... |
2208.14487 | Leonardo Rosa Werneck | Leonardo R. Werneck, Zachariah B. Etienne, Ariadna Murguia-Berthier,
Roland Haas, Federico Cipolletta, Scott C. Noble, Lorenzo Ennoggi, Federico
G. Lopez Armengol, Bruno Giacomazzo, Thiago Assump\c{c}\~ao, Joshua Faber,
Tanmayee Gupte, Bernard J. Kelly, Julian H. Krolik | Addition of tabulated equation of state and neutrino leakage support to
IllinoisGRMHD | 20 pages, 9 figures. v3 erratum: fixed typo in Eq. (21) | Phys. Rev. D 107, 044037 (2023) | 10.1103/PhysRevD.107.044037 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have added support for realistic, microphysical, finite-temperature
equations of state (EOS) and neutrino physics via a leakage scheme to
IllinoisGRMHD, an open-source GRMHD code for dynamical spacetimes in the
Einstein Toolkit. These new features are provided by two new, NRPy+-based
codes: NRPyEOS, which performs... | [
{
"created": "Tue, 30 Aug 2022 18:25:15 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2023 22:48:24 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Dec 2023 01:21:57 GMT",
"version": "v3"
}
] | 2023-12-18 | [
[
"Werneck",
"Leonardo R.",
""
],
[
"Etienne",
"Zachariah B.",
""
],
[
"Murguia-Berthier",
"Ariadna",
""
],
[
"Haas",
"Roland",
""
],
[
"Cipolletta",
"Federico",
""
],
[
"Noble",
"Scott C.",
""
],
[
"Ennoggi",
"L... | We have added support for realistic, microphysical, finite-temperature equations of state (EOS) and neutrino physics via a leakage scheme to IllinoisGRMHD, an open-source GRMHD code for dynamical spacetimes in the Einstein Toolkit. These new features are provided by two new, NRPy+-based codes: NRPyEOS, which performs h... |
1811.10405 | Badri Krishnan | Daniel Pook-Kolb, Ofek Birnholtz, Badri Krishnan, Erik Schnetter | The existence and stability of marginally trapped surfaces | 21 pages, 18 figures | Phys. Rev. D 99, 064005 (2019) | 10.1103/PhysRevD.99.064005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Marginally outer trapped surfaces (MOTSs, or marginal surfaces in short) are
routinely used in numerical simulations of black hole spacetimes. They are an
invaluable tool for locating and characterizing black holes quasi-locally in
real time while the simulation is ongoing. It is often believed that a MOTS can
behave... | [
{
"created": "Mon, 26 Nov 2018 14:45:35 GMT",
"version": "v1"
}
] | 2019-03-13 | [
[
"Pook-Kolb",
"Daniel",
""
],
[
"Birnholtz",
"Ofek",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Schnetter",
"Erik",
""
]
] | Marginally outer trapped surfaces (MOTSs, or marginal surfaces in short) are routinely used in numerical simulations of black hole spacetimes. They are an invaluable tool for locating and characterizing black holes quasi-locally in real time while the simulation is ongoing. It is often believed that a MOTS can behave u... |
2003.03990 | W{\l}odzimierz Piechocki | Andrzej G\'o\'zd\'z, W{\l}odzimierz Piechocki, Grzegorz Plewa, and
Tomasz Trze\'sniewski | Hunting for gravitational quantum spikes | 38 pages, 5 figures; version accepted for publication in Universe | Universe 7, 49 (2021) | 10.3390/universe7030049 | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the result of our examination of quantum structures called quantum
spikes. The classical spikes, that are known in gravitational systems, occur in
the evolution of the inhomogeneous spacetimes. Different kind of spikes, which
we name strange spikes, can be seen in the dynamics of the homogeneous sector
of ... | [
{
"created": "Mon, 9 Mar 2020 09:26:50 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Feb 2021 06:36:50 GMT",
"version": "v2"
}
] | 2021-03-05 | [
[
"Góźdź",
"Andrzej",
""
],
[
"Piechocki",
"Włodzimierz",
""
],
[
"Plewa",
"Grzegorz",
""
],
[
"Trześniewski",
"Tomasz",
""
]
] | We present the result of our examination of quantum structures called quantum spikes. The classical spikes, that are known in gravitational systems, occur in the evolution of the inhomogeneous spacetimes. Different kind of spikes, which we name strange spikes, can be seen in the dynamics of the homogeneous sector of th... |
2112.13877 | Artyom Astashenok V | A.V. Astashenok, S.D. Odintsov, A.S. Tepliakov | The unified history of the viscous accelerating universe and phase
transitions | 14 pp., 7 figs., to appear in Nucl. Phys. B | null | 10.1016/j.nuclphysb.2021.115646 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the unified description of the early acceleration (cosmological
inflation) and the present epoch of so called "dark energy". The inflation can
be described by cosmic fluid with van der Waals equation of state and with
viscosity term. Viscosity leads to slow-roll inflation with the parameters such
as the sp... | [
{
"created": "Mon, 27 Dec 2021 19:36:16 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Dec 2021 22:11:48 GMT",
"version": "v2"
}
] | 2022-01-19 | [
[
"Astashenok",
"A. V.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Tepliakov",
"A. S.",
""
]
] | We propose the unified description of the early acceleration (cosmological inflation) and the present epoch of so called "dark energy". The inflation can be described by cosmic fluid with van der Waals equation of state and with viscosity term. Viscosity leads to slow-roll inflation with the parameters such as the spec... |
2307.05376 | Rachael Huxford | Rachael Huxford, Rahul Kashyap, Ssohrab Borhanian, Arnab Dhani, Ish
Gupta, and B. S. Sathyaprakash | The Accuracy of Neutron Star Radius Measurement with the Next Generation
of Terrestrial Gravitational-Wave Observatories | Updated version with additional supporting text | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we explore the prospect for improving the measurement accuracy
of masses and radii of neutron stars. We consider imminent and long-term
upgrades of the Laser Interferometer Gravitational-Wave Observatory (LIGO) and
Virgo, as well as next-generation observatories -- the Cosmic Explorer and
Einstein Tele... | [
{
"created": "Mon, 10 Jul 2023 16:57:18 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 2023 14:29:04 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Mar 2024 16:35:38 GMT",
"version": "v3"
}
] | 2024-03-27 | [
[
"Huxford",
"Rachael",
""
],
[
"Kashyap",
"Rahul",
""
],
[
"Borhanian",
"Ssohrab",
""
],
[
"Dhani",
"Arnab",
""
],
[
"Gupta",
"Ish",
""
],
[
"Sathyaprakash",
"B. S.",
""
]
] | In this paper, we explore the prospect for improving the measurement accuracy of masses and radii of neutron stars. We consider imminent and long-term upgrades of the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo, as well as next-generation observatories -- the Cosmic Explorer and Einstein Telesc... |
1304.4984 | Marie-Anne Bizouard | Marie Anne Bizouard, Maria Alessandra Papa | Searching for gravitational waves with the LIGO and Virgo
interferometers | 33 pages, 4 figures, published in Comptes Rendus Physique | null | 10.1016/j.crhy.2013.03.001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first generation of ground-based interferometric gravitational wave
detectors, LIGO, GEO and Virgo, have operated and taken data at their design
sensitivities over the last few years. The data has been examined for the
presence of gravitational wave signals. Presented here is a comprehensive
review of the most si... | [
{
"created": "Wed, 17 Apr 2013 22:47:10 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Bizouard",
"Marie Anne",
""
],
[
"Papa",
"Maria Alessandra",
""
]
] | The first generation of ground-based interferometric gravitational wave detectors, LIGO, GEO and Virgo, have operated and taken data at their design sensitivities over the last few years. The data has been examined for the presence of gravitational wave signals. Presented here is a comprehensive review of the most sign... |
gr-qc/0103051 | Vladimir Mashkevich | Vladimir S. Mashkevich (Physics Department, Queens College, The City
University of New York) | The Indeterministic Einstein Equation: Quantum Jumps, Spacetime
Structure, and Dark Pseudomatter | 10 pages, LATEX 2e | null | null | null | gr-qc | null | Current physics is faced with the fundamental problem of unifying quantum
theory and general relativity, which would have resulted in quantum gravity.
The main effort to construct the latter has been bent on quantizing spacetime
structure, in particular metric. Meanwhile, taking account of the
indeterministic aspect ... | [
{
"created": "Thu, 15 Mar 2001 03:41:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mashkevich",
"Vladimir S.",
"",
"Physics Department, Queens College, The City\n University of New York"
]
] | Current physics is faced with the fundamental problem of unifying quantum theory and general relativity, which would have resulted in quantum gravity. The main effort to construct the latter has been bent on quantizing spacetime structure, in particular metric. Meanwhile, taking account of the indeterministic aspect of... |
gr-qc/0310132 | Emanuel Gallo | Emanuel Gallo | Generating Static Black Holes in Higher Dimensional Space-Times | LaTeX. 9 pages | Gen.Rel.Grav. 36 (2004) 1463-1471 | 10.1023/B:GERG.0000022582.28223.a0 | null | gr-qc | null | In this article we extend to higher dimensional space-times a recent theorem
proved by Salgado which characterizes a three-parameter family of static and
spherically symmetric solutions to the Einstein Field Equations. As it happens
in four dimensions, it is shown that the Schwarzschild, Reissner-Nordstrom and
global... | [
{
"created": "Thu, 30 Oct 2003 21:38:24 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 2003 13:49:19 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Gallo",
"Emanuel",
""
]
] | In this article we extend to higher dimensional space-times a recent theorem proved by Salgado which characterizes a three-parameter family of static and spherically symmetric solutions to the Einstein Field Equations. As it happens in four dimensions, it is shown that the Schwarzschild, Reissner-Nordstrom and global m... |
gr-qc/9905094 | Roberto Scipioni | R. Scipioni | Effective Levi-Civita Dilaton theory from Metric Affine Dilaton Gravity | 9 pages, Latex, revised final version for Physics Letters A | Phys.Lett. A259 (1999) 104-107 | 10.1016/S0375-9601(99)00413-2 | null | gr-qc | null | We show how a Metric Affine theory of Dilaton gravity can be reduced to an
effective Riemannian Dilaton gravity model. A simple generalization of the
Obukhov-Tucker-Wang theorem to Dilaton gravity is then presented.
| [
{
"created": "Tue, 25 May 1999 19:10:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Scipioni",
"R.",
""
]
] | We show how a Metric Affine theory of Dilaton gravity can be reduced to an effective Riemannian Dilaton gravity model. A simple generalization of the Obukhov-Tucker-Wang theorem to Dilaton gravity is then presented. |
1301.2586 | Elias Okon | Elias Okon and Daniel Sudarsky | On the Consistency of the Consistent Histories Approach to Quantum
Mechanics | 20 pages | Found Phys (2014) 44 p. 19 | 10.1007/s10701-013-9760-2 | null | gr-qc physics.hist-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Consistent Histories (CH) formalism aims at a quantum mechanical
framework which could be applied even to the universe as a whole. CH stresses
the importance of histories for quantum mechanics, as opposed to measurements,
and maintains that a satisfactory formulation of quantum mechanics allows one
to assign prob... | [
{
"created": "Fri, 11 Jan 2013 20:27:33 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Sep 2013 01:08:38 GMT",
"version": "v2"
}
] | 2014-02-17 | [
[
"Okon",
"Elias",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | The Consistent Histories (CH) formalism aims at a quantum mechanical framework which could be applied even to the universe as a whole. CH stresses the importance of histories for quantum mechanics, as opposed to measurements, and maintains that a satisfactory formulation of quantum mechanics allows one to assign probab... |
gr-qc/9311037 | Robert H. Gowdy | Robert H. Gowdy | Affine Projection Tensor Geometry: Decomposing the Curvature Tensor When
the Connection is Arbitrary and the Projection is Tilted | 49 pages, RevTeX 3.0 | J.Math.Phys. 35 (1994) 1274-1301 | 10.1063/1.530589 | null | gr-qc | null | This paper constructs the geometrically natural objects which are associated
with any projection tensor field on a manifold with any affine connection. The
approaches to projection tensor fields which have been used in general
relativity and related theories assume normal projection tensors of
co-dimension one and co... | [
{
"created": "Tue, 30 Nov 1993 16:57:31 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Gowdy",
"Robert H.",
""
]
] | This paper constructs the geometrically natural objects which are associated with any projection tensor field on a manifold with any affine connection. The approaches to projection tensor fields which have been used in general relativity and related theories assume normal projection tensors of co-dimension one and conn... |
2002.10402 | Vasilis Oikonomou | Shin'ichi Nojiri, S.D. Odintsov, V.K. Oikonomou, Arkady A. Popov | Propagation of Gravitational Waves in Chern-Simons Axion $F(R)$ Gravity | PDU Accepted | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we shall study the evolution of cosmological gravitational
waves in the context of Chern-Simons axion $F(R)$ gravity. In the case of
Chern-Simons axion $F(R)$ gravity there exist spin-0, spin-2 and spin-1 modes.
As we demonstrate, from all the gravitational waves modes of the Chern-Simons
axion $F(R)$ g... | [
{
"created": "Mon, 24 Feb 2020 17:41:14 GMT",
"version": "v1"
}
] | 2020-02-25 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Popov",
"Arkady A.",
""
]
] | In this paper we shall study the evolution of cosmological gravitational waves in the context of Chern-Simons axion $F(R)$ gravity. In the case of Chern-Simons axion $F(R)$ gravity there exist spin-0, spin-2 and spin-1 modes. As we demonstrate, from all the gravitational waves modes of the Chern-Simons axion $F(R)$ gra... |
2011.02491 | Manuel Hohmann | Manuel Hohmann | General cosmological perturbations in teleparallel gravity | 18 pages, no figures; invited contribution to the Eur. Phys. J. Plus
focus point "Modified Gravity Theories and Cosmology"; updated references to
accepted version | Eur. Phys. J. Plus 136 (2021) 65 | 10.1140/epjp/s13360-020-00969-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss linear perturbations of the most general class of teleparallel
spacetimes with cosmological symmetry, and perform a decomposition of these
perturbations into irreducible components. We then study their behavior under
gauge transformations, i.e., infinitesimal diffeomorphisms of the background
spacetime, an... | [
{
"created": "Wed, 4 Nov 2020 19:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2021 07:40:17 GMT",
"version": "v2"
}
] | 2021-01-12 | [
[
"Hohmann",
"Manuel",
""
]
] | We discuss linear perturbations of the most general class of teleparallel spacetimes with cosmological symmetry, and perform a decomposition of these perturbations into irreducible components. We then study their behavior under gauge transformations, i.e., infinitesimal diffeomorphisms of the background spacetime, and ... |
1802.01422 | Claus Kiefer | Claus Kiefer, David Wichmann | Semiclassical approximation of the Wheeler-DeWitt equation: arbitrary
orders and the question of unitarity | 15 pages | Gen. Relativ. Gravit. (2018) 50:66 | 10.1007/s10714-018-2390-4 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the Born-Oppenheimer type of approximation scheme for the
Wheeler-DeWitt equation of canonical quantum gravity to arbitrary orders in the
inverse Planck mass squared. We discuss in detail the origin of unitarity
violation in this scheme and show that unitarity can be restored by an
appropriate modification ... | [
{
"created": "Mon, 5 Feb 2018 14:39:32 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2018 09:05:36 GMT",
"version": "v2"
}
] | 2018-05-24 | [
[
"Kiefer",
"Claus",
""
],
[
"Wichmann",
"David",
""
]
] | We extend the Born-Oppenheimer type of approximation scheme for the Wheeler-DeWitt equation of canonical quantum gravity to arbitrary orders in the inverse Planck mass squared. We discuss in detail the origin of unitarity violation in this scheme and show that unitarity can be restored by an appropriate modification wh... |
gr-qc/9404031 | null | E. Malec and N. \'O Murchadha (Physics Department, University College,
Cork, Ireland and Uniwersytet Jagiello\'nski, Instytut Fizyki, 30-059
Krak\'ow, Poland) | Optical scalars in spherical spacetimes | null | Phys.Rev.D50:6033-6036,1994 | 10.1103/PhysRevD.50.R6033 | null | gr-qc | null | Consider a spherically symmetric spacelike slice through a spherically
symmetric spacetime. One can derive a universal bound for the optical scalars
on any such slice. The only requirement is that the matter sources satisfy the
dominant energy condition and that the slice be asymptotically flat and regular
at the ori... | [
{
"created": "Fri, 15 Apr 1994 16:53:05 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Malec",
"E.",
"",
"Physics Department, University College,\n Cork, Ireland and Uniwersytet Jagielloński, Instytut Fizyki, 30-059\n Kraków, Poland"
],
[
"Murchadha",
"N. Ó",
"",
"Physics Department, University College,\n Cork, Ireland and Uniwersytet Jagielloński, Instytut F... | Consider a spherically symmetric spacelike slice through a spherically symmetric spacetime. One can derive a universal bound for the optical scalars on any such slice. The only requirement is that the matter sources satisfy the dominant energy condition and that the slice be asymptotically flat and regular at the origi... |
gr-qc/0508114 | Takahiro Tanaka | Takahiro Tanaka | Gravitational radiation reaction | 26 pages, contribution to "The Next Chapter in Einstein's Legacy"
(YKIS2005), some changes in section 5.3 | Prog.Theor.Phys.Suppl. 163 (2006) 120-145 | 10.1143/PTPS.163.120 | null | gr-qc | null | We give a short personally-biased review on the recent progress in our
understanding of gravitational radiation reaction acting on a point particle
orbiting a black hole. The main motivation of this study is to obtain
sufficiently precise gravitational waveforms from inspiraling binary compact
stars with a large mass... | [
{
"created": "Sun, 28 Aug 2005 08:13:40 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Oct 2005 10:05:52 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Tanaka",
"Takahiro",
""
]
] | We give a short personally-biased review on the recent progress in our understanding of gravitational radiation reaction acting on a point particle orbiting a black hole. The main motivation of this study is to obtain sufficiently precise gravitational waveforms from inspiraling binary compact stars with a large mass r... |
0810.3060 | Ali Kaya | Ali Kaya | Cosmological particle creation: Fluctuations and an ensemble picture | 7 pages, received an honorable mention in 2008 Gravity Research
Foundation essay competition, to appear in special issue of IJMPD | Int.J.Mod.Phys.D17:2441-2445,2009 | 10.1142/S0218271808013935 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that in the context of quantum fields in time dependent
classical backgrounds, the number of created particles with a given momentum
largely deviates about its mean value. Since the corresponding Fourier modes
are nonlocal, this deviation shows that the expectation value of the number
operator can only m... | [
{
"created": "Fri, 17 Oct 2008 05:42:07 GMT",
"version": "v1"
}
] | 2009-03-20 | [
[
"Kaya",
"Ali",
""
]
] | We point out that in the context of quantum fields in time dependent classical backgrounds, the number of created particles with a given momentum largely deviates about its mean value. Since the corresponding Fourier modes are nonlocal, this deviation shows that the expectation value of the number operator can only mak... |
gr-qc/0402036 | Francois Gieres | C. P. Constantinidis, A. Deandrea, F. Gieres, M. Lefrancois and O.
Piguet | Symmetries and observables in topological gravity | 34 pages; a few explanations added in subsection 2.2.1, published
version of paper | Class.Quant.Grav. 21 (2004) 3515-3540 | 10.1088/0264-9381/21/14/014 | LYCEN 2004-01, UFES-DF-OP2003/6 | gr-qc hep-th | null | After a brief review of topological gravity, we present a superspace approach
to this theory. This formulation allows us to recover in a natural manner
various known results and to gain some insight into the precise relationship
between different approaches to topological gravity. Though the main focus of
our work is... | [
{
"created": "Fri, 6 Feb 2004 17:33:20 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 2004 13:14:37 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Constantinidis",
"C. P.",
""
],
[
"Deandrea",
"A.",
""
],
[
"Gieres",
"F.",
""
],
[
"Lefrancois",
"M.",
""
],
[
"Piguet",
"O.",
""
]
] | After a brief review of topological gravity, we present a superspace approach to this theory. This formulation allows us to recover in a natural manner various known results and to gain some insight into the precise relationship between different approaches to topological gravity. Though the main focus of our work is o... |
1903.10408 | Patryk Mach | Patryk Mach, Sergio Gimeno-Soler, Jose A. Font, Andrzej Odrzywolek,
Michal Pirog | Self-gravitating magnetised tori around black holes in general
relativity | 17 pages, 5 figures, 1 table | Phys. Rev. D 99, 104063 (2019) | 10.1103/PhysRevD.99.104063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate stationary, self-gravitating, magnetised disks (or tori)
around black holes. The models are obtained by numerically solving the coupled
system of the Einstein equations and the equations of ideal
general-relativistic magnetohydrodynamics. The mathematical formulation and
numerical aspects of our approa... | [
{
"created": "Mon, 25 Mar 2019 15:42:00 GMT",
"version": "v1"
}
] | 2019-06-05 | [
[
"Mach",
"Patryk",
""
],
[
"Gimeno-Soler",
"Sergio",
""
],
[
"Font",
"Jose A.",
""
],
[
"Odrzywolek",
"Andrzej",
""
],
[
"Pirog",
"Michal",
""
]
] | We investigate stationary, self-gravitating, magnetised disks (or tori) around black holes. The models are obtained by numerically solving the coupled system of the Einstein equations and the equations of ideal general-relativistic magnetohydrodynamics. The mathematical formulation and numerical aspects of our approach... |
gr-qc/0008046 | Jonathan Halliwell | J. J. Halliwell (Imperial College, London) | Trajectories for the Wave Function of the Universe from a Simple
Detector Model | 37 pages, plain Tex. Second draft. Substantial revisions | Phys.Rev. D64 (2001) 044008 | 10.1103/PhysRevD.64.044008 | Imperial College preprint TP/99-0/37 | gr-qc quant-ph | null | Inspired by Mott's (1929) analysis of particle tracks in a cloud chamber, we
consider a simple model for quantum cosmology which includes, in the total
Hamiltonian, model detectors registering whether or not the system, at any
stage in its entire history, passes through a series of regions in
configuration space. We ... | [
{
"created": "Fri, 18 Aug 2000 18:25:14 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2000 16:50:04 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Halliwell",
"J. J.",
"",
"Imperial College, London"
]
] | Inspired by Mott's (1929) analysis of particle tracks in a cloud chamber, we consider a simple model for quantum cosmology which includes, in the total Hamiltonian, model detectors registering whether or not the system, at any stage in its entire history, passes through a series of regions in configuration space. We th... |
1707.03368 | Roberto De Pietri | Francesco Maione, Roberto De Pietri, Alessandra Feo, Frank L\"offler | Spectral analysis of gravitational waves from binary neutron star merger
remnants | 19 pages, 6 figures | Phys. Rev. D 96, 063011 (2017) | 10.1103/PhysRevD.96.063011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we analyze the gravitational wave signal from hypermassive
neutron stars formed after the merger of binary neutron star systems, focusing
on its spectral features. The gravitational wave signals are extracted from
numerical relativity simulations of models already considered by De Pietri et
al. [Phys. Re... | [
{
"created": "Tue, 11 Jul 2017 17:14:00 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2017 17:26:45 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Oct 2017 07:43:44 GMT",
"version": "v3"
}
] | 2017-10-16 | [
[
"Maione",
"Francesco",
""
],
[
"De Pietri",
"Roberto",
""
],
[
"Feo",
"Alessandra",
""
],
[
"Löffler",
"Frank",
""
]
] | In this work we analyze the gravitational wave signal from hypermassive neutron stars formed after the merger of binary neutron star systems, focusing on its spectral features. The gravitational wave signals are extracted from numerical relativity simulations of models already considered by De Pietri et al. [Phys. Rev.... |
0805.4466 | James Battat | James B. R. Battat, Christopher W. Stubbs and John F. Chandler | Solar system constraints on the Dvali-Gabadadze-Porrati braneworld
theory of gravity | 9 pages, 2 figures, accepted for publication in Phys. Rev. D | Phys.Rev.D78:022003,2008 | 10.1103/PhysRevD.78.022003 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A number of proposals have been put forward to account for the observed
accelerating expansion of the Universe through modifications of gravity. One
specific scenario, Dvali-Gabadadze-Porrati (DGP) gravity, gives rise to a
potentially observable anomaly in the solar system: all planets would exhibit a
common anomalou... | [
{
"created": "Thu, 29 May 2008 03:58:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Battat",
"James B. R.",
""
],
[
"Stubbs",
"Christopher W.",
""
],
[
"Chandler",
"John F.",
""
]
] | A number of proposals have been put forward to account for the observed accelerating expansion of the Universe through modifications of gravity. One specific scenario, Dvali-Gabadadze-Porrati (DGP) gravity, gives rise to a potentially observable anomaly in the solar system: all planets would exhibit a common anomalous ... |
1612.00409 | Olivier Piguet | Ivan Morales, Bruno Neves, Zui Oporto and Olivier Piguet | Dimensionally compactified Chern-Simon theory in 5D as a gravitation
theory in 4D | 10 pages, Latex, Talk presented by O.P. at the Conference "IWARA
2016: Quarks and Cosmos", October 2016, Gramado, RS, Brazil. V2: Reference
added | null | 10.1142/S2010194517600059 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a gravitation theory in 4 dimensional space-time obtained by
compacting to 4 dimensions the five dimensional topological Chern-Simons theory
with the gauge group SO(1,5) or SO(2,4) -- the de Sitter or anti-de Sitter
group of 5-dimensional space-time. In the resulting theory, torsion, which is
solution of t... | [
{
"created": "Thu, 1 Dec 2016 20:12:23 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Dec 2016 12:16:46 GMT",
"version": "v2"
}
] | 2017-09-06 | [
[
"Morales",
"Ivan",
""
],
[
"Neves",
"Bruno",
""
],
[
"Oporto",
"Zui",
""
],
[
"Piguet",
"Olivier",
""
]
] | We propose a gravitation theory in 4 dimensional space-time obtained by compacting to 4 dimensions the five dimensional topological Chern-Simons theory with the gauge group SO(1,5) or SO(2,4) -- the de Sitter or anti-de Sitter group of 5-dimensional space-time. In the resulting theory, torsion, which is solution of the... |
1306.1037 | Jerome Perez | J\'er\^ome Perez, Andr\'e F\"uzfa, Timoteo Carletti, Laurence M\'elot,
Laurent Guedezounme | The Jungle Universe | 26 pages, 4 figures | General Relativity & Gravitation 46 1753 (2014) | 10.1007/s10714-014-1753-8 | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we exploit the fact that the dynamics of homogeneous and
isotropic Friedmann-Lemaitre universes is a special case of generalized
Lotka-Volterra system where the competitive species are the barotropic fluids
filling the Universe. Without coupling between those fluids, Lotka-Volterra
formulation offers a... | [
{
"created": "Wed, 5 Jun 2013 09:55:00 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jan 2014 12:31:34 GMT",
"version": "v2"
}
] | 2014-07-30 | [
[
"Perez",
"Jérôme",
""
],
[
"Füzfa",
"André",
""
],
[
"Carletti",
"Timoteo",
""
],
[
"Mélot",
"Laurence",
""
],
[
"Guedezounme",
"Laurent",
""
]
] | In this paper, we exploit the fact that the dynamics of homogeneous and isotropic Friedmann-Lemaitre universes is a special case of generalized Lotka-Volterra system where the competitive species are the barotropic fluids filling the Universe. Without coupling between those fluids, Lotka-Volterra formulation offers a p... |
0901.1125 | Benjamin K Tippett | Benjamin K. Tippett | Prolate horizons and the Penrose inequality | 6 pages, 5 figures | Phys.Rev.D79:104008,2009 | 10.1103/PhysRevD.79.104008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Penrose inequality has so far been proven in cases of spherical symmetry
and in cases of zero extrinsic curvature. The next simplest case worth
exploring would be non-spherical, non-rotating black holes with non-zero
extrinsic curvature. Following Karkowski et al.'s construction of prolate black
holes, we define ... | [
{
"created": "Thu, 8 Jan 2009 20:35:19 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2009 04:10:34 GMT",
"version": "v2"
}
] | 2009-10-29 | [
[
"Tippett",
"Benjamin K.",
""
]
] | The Penrose inequality has so far been proven in cases of spherical symmetry and in cases of zero extrinsic curvature. The next simplest case worth exploring would be non-spherical, non-rotating black holes with non-zero extrinsic curvature. Following Karkowski et al.'s construction of prolate black holes, we define in... |
gr-qc/0508049 | Jonathan R. Gair | Jonathan R Gair, Daniel J Kennefick and Shane L Larson | Semi-relativistic approximation to gravitational radiation from
encounters with nonspinning black holes | 27 pages, 12 figures; v2: revised manuscript includes small changes
to make paper consistent with published version; v3: a statement about how to
generalise our results to hyperbolic orbits was incorrect, new version
includes published erratum as an appendix | Phys.Rev.D72:084009,2005; Erratum-ibid.D74:109901,2006 | 10.1103/PhysRevD.72.084009 10.1103/PhysRevD.74.109901 | null | gr-qc | null | The capture of compact bodies by black holes in galactic nuclei is an
important prospective source for low frequency gravitational wave detectors,
such as the planned Laser Interferometer Space Antenna. This paper calculates,
using a semirelativistic approximation, the total energy and angular momentum
lost to gravit... | [
{
"created": "Thu, 11 Aug 2005 20:35:43 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2005 21:07:50 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jan 2007 22:23:43 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Gair",
"Jonathan R",
""
],
[
"Kennefick",
"Daniel J",
""
],
[
"Larson",
"Shane L",
""
]
] | The capture of compact bodies by black holes in galactic nuclei is an important prospective source for low frequency gravitational wave detectors, such as the planned Laser Interferometer Space Antenna. This paper calculates, using a semirelativistic approximation, the total energy and angular momentum lost to gravitat... |
2209.05938 | Sen Guo | Xiao-Xiong Zeng, Ke-Jian He, Guo-Ping Li, En-Wei Liang, Sen Guo | QED and accretion flow models effect on optical appearance of
Euler-Heisenberg black holes | 14 pages, 11 figures | Eur. Phys. J. C 82, 764 (2022) | 10.1140/epjc/s10052-022-10733-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Taking the quantum electrodynamics (QED) effect into account, we investigate
the geometrical-optics appearance of the Euler-Heisenberg (EH) black hole (BH)
under the different accretion flows context, which depends on the BH space-time
structure and different sources of light. The more significant magnetic charge
lea... | [
{
"created": "Tue, 30 Aug 2022 09:57:21 GMT",
"version": "v1"
}
] | 2022-09-14 | [
[
"Zeng",
"Xiao-Xiong",
""
],
[
"He",
"Ke-Jian",
""
],
[
"Li",
"Guo-Ping",
""
],
[
"Liang",
"En-Wei",
""
],
[
"Guo",
"Sen",
""
]
] | Taking the quantum electrodynamics (QED) effect into account, we investigate the geometrical-optics appearance of the Euler-Heisenberg (EH) black hole (BH) under the different accretion flows context, which depends on the BH space-time structure and different sources of light. The more significant magnetic charge leads... |
1409.2572 | Durmus Demir | Durmus A. Demir | Riemann-Eddington theory: Incorporating matter, degravitating the
cosmological constant | 17 pp | Phys. Rev. D 90, 064017 (2014) | 10.1103/PhysRevD.90.064017 | IZTECH-P-2014/1 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we show that, Eddington's pure affine gravity, when extended with
Riemann curvature, leads to gravitational field equations that incorporate
matter. This Riemanned Eddington gravity outfits a setup in which matter
gravitates normally with Newton's constant but vacuum gravitates differently
with an independent gr... | [
{
"created": "Tue, 9 Sep 2014 02:25:05 GMT",
"version": "v1"
}
] | 2014-09-16 | [
[
"Demir",
"Durmus A.",
""
]
] | Here we show that, Eddington's pure affine gravity, when extended with Riemann curvature, leads to gravitational field equations that incorporate matter. This Riemanned Eddington gravity outfits a setup in which matter gravitates normally with Newton's constant but vacuum gravitates differently with an independent grav... |
0801.3879 | Banibrata Mukhopadhyay | Banibrata Mukhopadhyay, Kaushik Ghosh | Separation of Dirac equation in the 3+1 dimensional constant curvature
black hole background and its solution | 13 latex pages; accepted for publication in Classical and Quantum
Gravity | Class.Quant.Grav.25:065006,2008 | 10.1088/0264-9381/25/6/065006 | null | gr-qc astro-ph hep-th | null | The behavior of spin-half particles is discussed in the 3 + 1-dimensional
constant curvature black hole (CCBH) spacetime. We use Schwarzschild-like
coordinates, valid outside the black hole event horizon. The constant time
surfaces corresponding to the time-like Killing vector are degenerate at the
black hole event h... | [
{
"created": "Fri, 25 Jan 2008 05:26:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mukhopadhyay",
"Banibrata",
""
],
[
"Ghosh",
"Kaushik",
""
]
] | The behavior of spin-half particles is discussed in the 3 + 1-dimensional constant curvature black hole (CCBH) spacetime. We use Schwarzschild-like coordinates, valid outside the black hole event horizon. The constant time surfaces corresponding to the time-like Killing vector are degenerate at the black hole event hor... |
2407.02531 | Muhammad Sharif | Iqra Nawazish and M. Sharif | Cosmic Expansion and Noether Gauge Symmetries in
$f(R,T,R_{\mu\nu}T^{\mu\nu})$ Gravity | 31 pages, 11 figures | New Astronomy 107(2024)102163 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work explores different evolutionary phases of isotropically
homogeneous and flat cosmos filled with dust fluid in non-minimally coupled
gravity. We consider different models of this gravity to discuss the presence
of symmetry generators together with conserved integrals using Nother Gauge
symmetry scheme... | [
{
"created": "Mon, 1 Jul 2024 10:35:12 GMT",
"version": "v1"
}
] | 2024-07-04 | [
[
"Nawazish",
"Iqra",
""
],
[
"Sharif",
"M.",
""
]
] | The present work explores different evolutionary phases of isotropically homogeneous and flat cosmos filled with dust fluid in non-minimally coupled gravity. We consider different models of this gravity to discuss the presence of symmetry generators together with conserved integrals using Nother Gauge symmetry scheme. ... |
2302.03111 | Daniel Alexander Weiss | Daniel Alexander Weiss | A microscopic analogue of the BMS group | 47 pages, wording changed | J. High Energ. Phys. 2023, 136 (2023) | 10.1007/JHEP04(2023)136 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a microscopic analogue of the BMS analysis of asymptotic
symmetries by analysing universal geometric structures on infinitesimal tangent
light cones. Thereby, two natural microscopic symmetry groups arise: A
non-trivially represented Lorentz group and a BMS-like group. The latter has a
rich mathematical s... | [
{
"created": "Mon, 6 Feb 2023 20:22:21 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Feb 2023 11:03:44 GMT",
"version": "v2"
},
{
"created": "Sat, 1 Apr 2023 14:22:07 GMT",
"version": "v3"
}
] | 2023-05-02 | [
[
"Weiss",
"Daniel Alexander",
""
]
] | We consider a microscopic analogue of the BMS analysis of asymptotic symmetries by analysing universal geometric structures on infinitesimal tangent light cones. Thereby, two natural microscopic symmetry groups arise: A non-trivially represented Lorentz group and a BMS-like group. The latter has a rich mathematical str... |
2012.08663 | Ward Struyve | Ward Struyve | Wheeler-DeWitt quantization for point-particles | 11 pages, LaTex; v2 typos corrected | Gen. Relativ. Gravit. 53, 32 (2021) | 10.1007/s10714-021-02802-6 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present the Hamiltonian formulation of a relativistic point-particle
coupled to Einstein gravity and its canonical quantization \`a la
Wheeler-DeWitt. In the resulting quantum theory, the wave functional is a
function of the particle coordinates and the 3-metric. It satisfies a
particular Hamiltonian and diffeomor... | [
{
"created": "Tue, 15 Dec 2020 23:15:34 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2021 19:42:51 GMT",
"version": "v2"
}
] | 2021-03-15 | [
[
"Struyve",
"Ward",
""
]
] | We present the Hamiltonian formulation of a relativistic point-particle coupled to Einstein gravity and its canonical quantization \`a la Wheeler-DeWitt. In the resulting quantum theory, the wave functional is a function of the particle coordinates and the 3-metric. It satisfies a particular Hamiltonian and diffeomorph... |
gr-qc/0608013 | Yakov Itin | Shmuel Kaniel and Yakov Itin | Equations of motion for a (non-linear) scalar field model as derived
from the field equations | Accepted in Annalen der Physik | Annalen Phys.15:877-893,2006 | 10.1002/andp.200610218 | null | gr-qc | null | The problem of derivation of the equations of motion from the field equations
is considered. Einstein's field equations have a specific analytical form: They
are linear in the second order derivatives and quadratic in the first order
derivatives of the field variables. We utilize this particular form and propose
a no... | [
{
"created": "Wed, 2 Aug 2006 16:26:27 GMT",
"version": "v1"
}
] | 2011-04-21 | [
[
"Kaniel",
"Shmuel",
""
],
[
"Itin",
"Yakov",
""
]
] | The problem of derivation of the equations of motion from the field equations is considered. Einstein's field equations have a specific analytical form: They are linear in the second order derivatives and quadratic in the first order derivatives of the field variables. We utilize this particular form and propose a nove... |
gr-qc/9710026 | Luis Anchordoqui | Luis A. Anchordoqui, Diego F. Torres, Marta L. Trobo and Santiago E.
Perez Bergliaffa | Evolving wormhole geometries | 12 pages latex, 3 figures, to appear in Phys. Rev. D., Title
corrected | Phys.Rev. D57 (1998) 829-833 | 10.1103/PhysRevD.57.829 | null | gr-qc | null | We present here analytical solutions of General Relativity that describe
evolving wormholes with a non-constant redshift function. We show that the
matter that threads these wormholes is not necessarily exotic. Finally, we
investigate some issues concerning WEC violation and human traversability in
these time-depende... | [
{
"created": "Fri, 3 Oct 1997 18:43:20 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 1997 14:44:37 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Torres",
"Diego F.",
""
],
[
"Trobo",
"Marta L.",
""
],
[
"Bergliaffa",
"Santiago E. Perez",
""
]
] | We present here analytical solutions of General Relativity that describe evolving wormholes with a non-constant redshift function. We show that the matter that threads these wormholes is not necessarily exotic. Finally, we investigate some issues concerning WEC violation and human traversability in these time-dependent... |
gr-qc/0307105 | Valentin Rudenko | V.N.Rudenko | Optimization of parameters of a couple generator-receiver for a
gravitational Hertz experiment | 8 pages, 0 figures. Talk on International High-Frequency
Gravitational Waves Workshop May 6-9, 2003, McLean VA 22102, USA. To be
published in Proceedings of HFGW conference ed. MITRE Corporation | null | null | null | gr-qc | null | Brief review of principal ideas, estimates and schemes proposed by Russian
research groups in respect of the gravitational radiation generated and
detected in the laboratory condition is presented. Analysis leads to conclusion
that the more promising variant of the laboratory GW-Hertz experiment might be
associated w... | [
{
"created": "Thu, 24 Jul 2003 09:42:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rudenko",
"V. N.",
""
]
] | Brief review of principal ideas, estimates and schemes proposed by Russian research groups in respect of the gravitational radiation generated and detected in the laboratory condition is presented. Analysis leads to conclusion that the more promising variant of the laboratory GW-Hertz experiment might be associated wit... |
1312.1420 | Matthew J. Lake Dr | Tiberiu Harko and Matthew J. Lake | Null fluid collapse in brane world models | 24 pages, no figures. Published version | Phys. Rev. D 89, 064038 (2014) | 10.1103/PhysRevD.89.064038 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The brane world description of our universe entails a large extra dimension
and a fundamental scale of gravity that may be lower than the Planck scale by
several orders of magnitude. An interesting consequence of this scenario occurs
in the nature of spherically-symmetric vacuum solutions to the brane
gravitational f... | [
{
"created": "Thu, 5 Dec 2013 03:14:26 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Feb 2014 14:21:09 GMT",
"version": "v2"
},
{
"created": "Sat, 26 Sep 2015 10:31:02 GMT",
"version": "v3"
}
] | 2015-09-29 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lake",
"Matthew J.",
""
]
] | The brane world description of our universe entails a large extra dimension and a fundamental scale of gravity that may be lower than the Planck scale by several orders of magnitude. An interesting consequence of this scenario occurs in the nature of spherically-symmetric vacuum solutions to the brane gravitational fie... |
2209.03959 | Sanasam Surendra Singh | L. Anjana Devi, S. Surendra Singh, Leishingam Kumrah and Md Khurshid
Alam | Anisotropic Universe in f(Q) gravity with Hybrid expansion | arXiv admin note: text overlap with arXiv:2208.08877 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite having a reasonably successful account of accelerated cosmology,
understanding the early evolution of Universe has always been difficult for
mankind. Our promising strategy is based on a novel class of symmetric
teleparallel theories of gravity called $f(Q)$, in which the gravitational
interaction is caused b... | [
{
"created": "Thu, 8 Sep 2022 01:46:03 GMT",
"version": "v1"
}
] | 2022-09-12 | [
[
"Devi",
"L. Anjana",
""
],
[
"Singh",
"S. Surendra",
""
],
[
"Kumrah",
"Leishingam",
""
],
[
"Alam",
"Md Khurshid",
""
]
] | Despite having a reasonably successful account of accelerated cosmology, understanding the early evolution of Universe has always been difficult for mankind. Our promising strategy is based on a novel class of symmetric teleparallel theories of gravity called $f(Q)$, in which the gravitational interaction is caused by ... |
gr-qc/0411046 | Francisco Diego Mazzitelli | Alejandro Satz, Francisco D. Mazzitelli, Ezequiel Alvarez | Vacuum polarization around stars: nonlocal approximation | 8 pages, no figures | Phys.Rev.D71:064001,2005 | 10.1103/PhysRevD.71.064001 | null | gr-qc | null | We compute the vacuum polarization associated with quantum massless fields
around stars with spherical symmetry. The nonlocal contribution to the vacuum
polarization is dominant in the weak field limit, and induces quantum
corrections to the exterior metric that depend on the inner structure of the
star. It also viol... | [
{
"created": "Tue, 9 Nov 2004 14:59:54 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Satz",
"Alejandro",
""
],
[
"Mazzitelli",
"Francisco D.",
""
],
[
"Alvarez",
"Ezequiel",
""
]
] | We compute the vacuum polarization associated with quantum massless fields around stars with spherical symmetry. The nonlocal contribution to the vacuum polarization is dominant in the weak field limit, and induces quantum corrections to the exterior metric that depend on the inner structure of the star. It also violat... |
2211.01769 | Hoang Nguyen | Hoang Ky Nguyen | Beyond Schwarzschild-de Sitter spacetimes: I. A new exhaustive class of
metrics inspired by Buchdahl for pure $R^2$ gravity in a compact form | This recently accepted paper is the first installment of a
three-paper "Beyond SdS spacetimes" series, being under review at Phys. Rev.
D. Link to PRD:
https://journals.aps.org/prd/accepted/e907dQ06D1310133219288223264bd8b133a125f1 | Phys. Rev. D 106, 104004 (2022) (set to be online for November 03,
2022) | 10.1103/PhysRevD.106.104004 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some sixty years ago Buchdahl pioneered a program in search of static
spherically symmetric vacua for pure $R^{2}$ gravity (Nuovo Cimento, Vol 23, No
1, pp 141-157 (1962); [https://link.springer.com/article/10.1007/BF02733549]).
Surpassing several obstacles, his work culminated in a non-linear second-order
ordinary d... | [
{
"created": "Wed, 2 Nov 2022 17:46:23 GMT",
"version": "v1"
}
] | 2022-11-04 | [
[
"Nguyen",
"Hoang Ky",
""
]
] | Some sixty years ago Buchdahl pioneered a program in search of static spherically symmetric vacua for pure $R^{2}$ gravity (Nuovo Cimento, Vol 23, No 1, pp 141-157 (1962); [https://link.springer.com/article/10.1007/BF02733549]). Surpassing several obstacles, his work culminated in a non-linear second-order ordinary dif... |
1107.2791 | Philippe Grandcl\'ement | P. Grandclement, G. Fodor and P. Forgacs | Numerical simulation of oscillatons: extracting the radiating tail | 22 figures, accepted for publication in PRD | null | 10.1103/PhysRevD.84.065037 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spherically symmetric, time-periodic oscillatons -- solutions of the
Einstein-Klein-Gordon system (a massive scalar field coupled to gravity) with a
spatially localized core -- are investigated by very precise numerical
techniques based on spectral methods. In particular the amplitude of their
standing-wave tail is d... | [
{
"created": "Thu, 14 Jul 2011 11:31:02 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2011 14:36:47 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Grandclement",
"P.",
""
],
[
"Fodor",
"G.",
""
],
[
"Forgacs",
"P.",
""
]
] | Spherically symmetric, time-periodic oscillatons -- solutions of the Einstein-Klein-Gordon system (a massive scalar field coupled to gravity) with a spatially localized core -- are investigated by very precise numerical techniques based on spectral methods. In particular the amplitude of their standing-wave tail is det... |
0810.0072 | Richard Epp | Richard J. Epp, Robert B. Mann, Paul L. McGrath | Rigid motion revisited: rigid quasilocal frames | 10 pages (two column), 24 pages (preprint), 1 figure | Class.Quant.Grav.26:035015,2009 | 10.1088/0264-9381/26/3/035015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the notion of a rigid quasilocal frame (RQF) as a geometrically
natural way to define a "system" in general relativity. An RQF is defined as a
two-parameter family of timelike worldlines comprising the worldtube boundary
of the history of a finite spatial volume, with the rigidity conditions that
the con... | [
{
"created": "Wed, 1 Oct 2008 17:31:37 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Nov 2008 02:54:14 GMT",
"version": "v2"
}
] | 2009-01-27 | [
[
"Epp",
"Richard J.",
""
],
[
"Mann",
"Robert B.",
""
],
[
"McGrath",
"Paul L.",
""
]
] | We introduce the notion of a rigid quasilocal frame (RQF) as a geometrically natural way to define a "system" in general relativity. An RQF is defined as a two-parameter family of timelike worldlines comprising the worldtube boundary of the history of a finite spatial volume, with the rigidity conditions that the congr... |
2103.12442 | Tobias Benjamin Russ | Tobias B. Russ | On Stability of Asymptotically Free Mimetic Ho\v{r}ava Gravity | 29 pages, 0 figures; (version 3: adjustment of misleading use of
terminology, correction of typos and small rewritings, added references) | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Asymptotically free mimetic gravity has been introduced as a proposal for a
classical limiting curvature theory with the purpose of singularity resolution.
It was found that in a spatially flat universe an initial stage of exponential
expansion with graceful exit is a generic consequence, regardless of the matter
con... | [
{
"created": "Tue, 23 Mar 2021 10:45:29 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Apr 2021 17:01:38 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Apr 2021 09:58:52 GMT",
"version": "v3"
}
] | 2021-05-03 | [
[
"Russ",
"Tobias B.",
""
]
] | Asymptotically free mimetic gravity has been introduced as a proposal for a classical limiting curvature theory with the purpose of singularity resolution. It was found that in a spatially flat universe an initial stage of exponential expansion with graceful exit is a generic consequence, regardless of the matter conte... |
gr-qc/9703032 | Moffat | J. W. Moffat | Stochastic Gravity and Self-Organized Critical Cosmology | 8 pages RevTex. Talk given at the XXXIInd Rencontres de Moriond, Les
Arcs, France, January, 1997 | null | null | UTPT-97-06 | gr-qc hep-ph | null | A stochastic theory of gravity is described in which the metric tensor is a
random variable such that the spacetime manifold is a fluctuating physical
system at a certain length scale. A general formalism is described for
calculating probability densities for gravitational phenomena in a
generalization of general rel... | [
{
"created": "Wed, 12 Mar 1997 21:03:46 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Mar 1997 19:37:28 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Moffat",
"J. W.",
""
]
] | A stochastic theory of gravity is described in which the metric tensor is a random variable such that the spacetime manifold is a fluctuating physical system at a certain length scale. A general formalism is described for calculating probability densities for gravitational phenomena in a generalization of general relat... |
0809.3314 | Roberto A. Sussman | Roberto A Sussman | Quasi-local variables, non-linear perturbations and back-reaction in
spherically symmetric spacetimes | 24 pages IOP LaTeX style, has no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a quasi-local integral functional and scalar quasi-local
variables to examine a wide class of spherically symmetric inhomogeneous
spacetimes that generalize the Lemaitre-Tolman-Bondi (LTB) dust solutions
("LTB" spacetimes). By using these variables, we can transform the fluid flow
evolution equations int... | [
{
"created": "Fri, 19 Sep 2008 13:00:04 GMT",
"version": "v1"
}
] | 2008-09-22 | [
[
"Sussman",
"Roberto A",
""
]
] | We introduce a quasi-local integral functional and scalar quasi-local variables to examine a wide class of spherically symmetric inhomogeneous spacetimes that generalize the Lemaitre-Tolman-Bondi (LTB) dust solutions ("LTB" spacetimes). By using these variables, we can transform the fluid flow evolution equations into ... |
1512.08674 | Farhad Darabi | M. Khodadi, Y. Heydarzade, F. Darabi and E. N. Saridakis | Emergent universe in Horava-Lifshitz-like F(R) gravity | 9 pages, 2 figures | Phys. Rev. D 93, 124019 (2016) | 10.1103/PhysRevD.93.124019 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Einstein static universe (ESU) and the emergent universe
scenario in the framework of Ho\v{r}ava-Lifshitz-like $F(R)$ gravity. We first
perform a dynamical analysis in the phase space, and amongst others we show
that a spatially open universe filled with matter satisfying the strong energy
conditio... | [
{
"created": "Tue, 29 Dec 2015 13:11:37 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2016 14:12:26 GMT",
"version": "v2"
}
] | 2016-06-10 | [
[
"Khodadi",
"M.",
""
],
[
"Heydarzade",
"Y.",
""
],
[
"Darabi",
"F.",
""
],
[
"Saridakis",
"E. N.",
""
]
] | We investigate the Einstein static universe (ESU) and the emergent universe scenario in the framework of Ho\v{r}ava-Lifshitz-like $F(R)$ gravity. We first perform a dynamical analysis in the phase space, and amongst others we show that a spatially open universe filled with matter satisfying the strong energy condition ... |
2005.11288 | Shreyas Bapat | Shreyas Bapat, Ritwik Saha, Bhavya Bhatt, Shilpi Jain, Akshita Jain,
Sof\'ia Ort\'in Vela, Priyanshu Khandelwal, Jyotirmaya Shivottam, Jialin Ma,
Gim Seng Ng, Pratyush Kerhalkar, Hrishikesh Sudam Sarode, Rishi Sharma, Manvi
Gupta, Divya Gupta, Tushar Tyagi, Tanmay Rustagi, Varun Singh, Saurabh
Bansal, Naman Tay... | EinsteinPy: A Community Python Package for General Relativity | We plan to submit it to A&A. 9 pages | null | null | null | gr-qc astro-ph.CO astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents EinsteinPy (version 0.3), a community-developed Python
package for gravitational and relativistic astrophysics. Python is a free, easy
to use a high-level programming language which has seen a huge expansion in the
number of its users and developers in recent years. Specifically, a lot of
recent s... | [
{
"created": "Fri, 22 May 2020 17:28:34 GMT",
"version": "v1"
}
] | 2020-05-25 | [
[
"Bapat",
"Shreyas",
""
],
[
"Saha",
"Ritwik",
""
],
[
"Bhatt",
"Bhavya",
""
],
[
"Jain",
"Shilpi",
""
],
[
"Jain",
"Akshita",
""
],
[
"Vela",
"Sofía Ortín",
""
],
[
"Khandelwal",
"Priyanshu",
""
],
[
... | This paper presents EinsteinPy (version 0.3), a community-developed Python package for gravitational and relativistic astrophysics. Python is a free, easy to use a high-level programming language which has seen a huge expansion in the number of its users and developers in recent years. Specifically, a lot of recent stu... |
gr-qc/0011011 | Ernest Tagirov | E.A.Tagirov | On Quantum Mechanics in Friedmann-Robertson-Walker Universe | 8 pages | null | null | null | gr-qc hep-th math-ph math.MP quant-ph | null | It is shown that only in the space-times admitting a 1+3-foliation by flat
Cauchy hypesurfaces (i.e., in the Bianchi I type space-times the isotropic
version of which the spatially flat Friedmann-Robertson-Walker space-times are)
the canonical quantization of geodesic motion and quantum-mechanics obtained as
an asymp... | [
{
"created": "Fri, 3 Nov 2000 15:52:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tagirov",
"E. A.",
""
]
] | It is shown that only in the space-times admitting a 1+3-foliation by flat Cauchy hypesurfaces (i.e., in the Bianchi I type space-times the isotropic version of which the spatially flat Friedmann-Robertson-Walker space-times are) the canonical quantization of geodesic motion and quantum-mechanics obtained as an asympto... |
gr-qc/0208081 | Jacob D. Bekenstein | Jacob D. Bekenstein | Fine-structure constant variability, equivalence principle and cosmology | RevTeX-4, 22 pages, no figures, added a section on caveats as well as
several new references with discussion of them in body. To appear in Phys.
Rev. D | Phys.Rev. D66 (2002) 123514 | 10.1103/PhysRevD.66.123514 | null | gr-qc astro-ph hep-th | null | It has been widely believed that variability of the fine-structure constant
alpha would imply detectable violations of the weak equivalence principle. This
belief is not justified in general. It is put to rest here in the context of
the general framework for alpha variability [J. D. Bekenstein, Phys. Rev. D 25,
1527 ... | [
{
"created": "Tue, 27 Aug 2002 05:26:31 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Dec 2002 14:31:41 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Bekenstein",
"Jacob D.",
""
]
] | It has been widely believed that variability of the fine-structure constant alpha would imply detectable violations of the weak equivalence principle. This belief is not justified in general. It is put to rest here in the context of the general framework for alpha variability [J. D. Bekenstein, Phys. Rev. D 25, 1527 (1... |
gr-qc/9405061 | Janna Levin | Janna Levin | Gravity-Driven Acceleration of the Cosmic Expansion | 23 pages, LaTex, figures available upon request, (revisions include
added references and comment on inflation) CITA-94-18 | Phys.Rev.D51:462-471,1995 | 10.1103/PhysRevD.51.462 | null | gr-qc astro-ph | null | It is shown here that a dynamical Planck mass can drive the scale factor of
the universe to accelerate. The negative pressure which drives the cosmic
acceleration is identified with the unusual kinetic energy density of the
Planck field. No potential nor cosmological constant is required. This suggests
a purely gravi... | [
{
"created": "Wed, 25 May 1994 21:13:50 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jun 1994 21:49:45 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Levin",
"Janna",
""
]
] | It is shown here that a dynamical Planck mass can drive the scale factor of the universe to accelerate. The negative pressure which drives the cosmic acceleration is identified with the unusual kinetic energy density of the Planck field. No potential nor cosmological constant is required. This suggests a purely gravity... |
2005.08310 | Phongpichit Channuie | Areef Waeming (Walailak U.), Phongpichit Channuie (Walailak U.) | Inflation from $f(R)$ theories in gravity's rainbow | v1: 29 pages, many figures. arXiv admin note: text overlap with
arXiv:1903.05996 | Eur.Phys.J. C80 (2020) no.9, 802 | 10.1140/epjc/s10052-020-8387-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the $f(R)$ models of inflation in the context of
gravity's rainbow theory. We choose three types of $f(R)$ models:
$f(R)=R+\alpha (R/M)^{n},\,f(R)=R+\alpha R^{2}+\beta R^{2}\log(R/M^{2})$ and
the Einstein-Hu-Sawicki model with $n,\,\alpha,\,\beta$ being arbitrary real
constants. Here $R$ and $M... | [
{
"created": "Thu, 14 May 2020 14:35:25 GMT",
"version": "v1"
}
] | 2020-09-02 | [
[
"Waeming",
"Areef",
"",
"Walailak U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
]
] | In this work, we study the $f(R)$ models of inflation in the context of gravity's rainbow theory. We choose three types of $f(R)$ models: $f(R)=R+\alpha (R/M)^{n},\,f(R)=R+\alpha R^{2}+\beta R^{2}\log(R/M^{2})$ and the Einstein-Hu-Sawicki model with $n,\,\alpha,\,\beta$ being arbitrary real constants. Here $R$ and $M$ ... |
0907.3436 | Wlodzimierz Piechocki | Piotr Dzierzak, Przemyslaw Malkiewicz and Wlodzimierz Piechocki | Turning Big Bang into Big Bounce: I. Classical Dynamics | 14 pages, 1 figure, version accepted for publication in Physical
Review D | Phys.Rev.D80:104001,2009 | 10.1103/PhysRevD.80.104001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The big bounce (BB) transition within a flat Friedmann-Robertson-Walker model
is analyzed in the setting of loop geometry underlying the loop cosmology. We
solve the constraint of the theory at the classical level to identify physical
phase space and find the Lie algebra of the Dirac observables. We express
energy de... | [
{
"created": "Mon, 20 Jul 2009 16:08:18 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Sep 2009 12:10:28 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Oct 2009 11:37:32 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Dzierzak",
"Piotr",
""
],
[
"Malkiewicz",
"Przemyslaw",
""
],
[
"Piechocki",
"Wlodzimierz",
""
]
] | The big bounce (BB) transition within a flat Friedmann-Robertson-Walker model is analyzed in the setting of loop geometry underlying the loop cosmology. We solve the constraint of the theory at the classical level to identify physical phase space and find the Lie algebra of the Dirac observables. We express energy dens... |
2110.05166 | Ivo Iliev | H. Dimov, M. Radomirov, I. N. Iliev, R. C. Rashkov, T. Vetsov | Global and local thermodynamics of the (2+1)-dimensional rotating
Gauss-Bonnet black hole | 24 pages, 7 figures | null | 10.1103/PhysRevD.105.044033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is to study the local and the global thermodynamic
properties of the 3-dimensional rotating Gauss-Bonnet black hole. To this end
we consider the conditions for local and global thermodynamic stability of the
solution in a given ensemble of state quantities. Concerning the local analysis
we found... | [
{
"created": "Mon, 11 Oct 2021 11:27:15 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jan 2022 20:25:58 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Dimov",
"H.",
""
],
[
"Radomirov",
"M.",
""
],
[
"Iliev",
"I. N.",
""
],
[
"Rashkov",
"R. C.",
""
],
[
"Vetsov",
"T.",
""
]
] | The aim of this paper is to study the local and the global thermodynamic properties of the 3-dimensional rotating Gauss-Bonnet black hole. To this end we consider the conditions for local and global thermodynamic stability of the solution in a given ensemble of state quantities. Concerning the local analysis we found t... |
gr-qc/0003072 | Philippe Grandclement | P. Grandclement, S. Bonazzola, E. Gourgoulhon and J.-A. Marck | A multi-domain spectral method for scalar and vectorial Poisson
equations with non-compact sources | Minor revisions. 31 pages, 13 figures, accepted for publication J.
Comp. Phys | J.Comput.Phys. 170 (2001) 231-260 | 10.1006/jcph.2001.6734 | null | gr-qc astro-ph physics.comp-ph | null | We present a spectral method for solving elliptic equations which arise in
general relativity, namely three-dimensional scalar Poisson equations, as well
as generalized vectorial Poisson equations of the type $\Delta \vec{N} +
\lambda \vec{\nabla}(\vec{\nabla}\cdot \vec{N}) = \vec{S}$ with $\lambda \not=
-1$. The sou... | [
{
"created": "Fri, 17 Mar 2000 13:42:21 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2001 11:22:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Grandclement",
"P.",
""
],
[
"Bonazzola",
"S.",
""
],
[
"Gourgoulhon",
"E.",
""
],
[
"Marck",
"J. -A.",
""
]
] | We present a spectral method for solving elliptic equations which arise in general relativity, namely three-dimensional scalar Poisson equations, as well as generalized vectorial Poisson equations of the type $\Delta \vec{N} + \lambda \vec{\nabla}(\vec{\nabla}\cdot \vec{N}) = \vec{S}$ with $\lambda \not= -1$. The sourc... |
1211.6785 | Joel Saavedra | Carlos Leiva, Joel Saavedra and J.R. Villanueva | The Kepler problem in the Snyder space | null | null | 10.1007/s12043-013-0540-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the Kepler problem in the non commutative Snyder
scenario. We characterize the deformations in the Poisson bracket algebra under
a mimic procedure from quantum standard formulations and taking into account a
general recipe to build the noncommutative phase space coordinates (in the
sense of Poi... | [
{
"created": "Thu, 29 Nov 2012 00:04:45 GMT",
"version": "v1"
}
] | 2017-07-26 | [
[
"Leiva",
"Carlos",
""
],
[
"Saavedra",
"Joel",
""
],
[
"Villanueva",
"J. R.",
""
]
] | In this paper we study the Kepler problem in the non commutative Snyder scenario. We characterize the deformations in the Poisson bracket algebra under a mimic procedure from quantum standard formulations and taking into account a general recipe to build the noncommutative phase space coordinates (in the sense of Poiss... |
1101.2921 | Leo Stein | Nicolas Yunes, Leo C. Stein | Non-Spinning Black Holes in Alternative Theories of Gravity | 7 pages, submitted to PRD | Phys.Rev.D83:104002,2011 | 10.1103/PhysRevD.83.104002 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two large classes of alternative theories, modifying the action
through algebraic, quadratic curvature invariants coupled to scalar fields. We
find one class that admits solutions that solve the vacuum Einstein equations
and another that does not. In the latter, we find a deformation to the
Schwarzschild met... | [
{
"created": "Fri, 14 Jan 2011 22:27:38 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2011 22:34:20 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Yunes",
"Nicolas",
""
],
[
"Stein",
"Leo C.",
""
]
] | We study two large classes of alternative theories, modifying the action through algebraic, quadratic curvature invariants coupled to scalar fields. We find one class that admits solutions that solve the vacuum Einstein equations and another that does not. In the latter, we find a deformation to the Schwarzschild metri... |
gr-qc/0501062 | David Tegankong | David Tegankong | Global existence and future asymptotic behaviour for solutions of the
Einstein-Vlasov-scalar field system with surface symmetry | 14 pages | Class.Quant.Grav. 22 (2005) 2381-2392 | 10.1088/0264-9381/22/12/005 | null | gr-qc | null | We prove in the cases of plane and hyperbolic symmetries a global in time
existence result in the future for comological solutions of the
Einstein-Vlasov-scalar field system, with the sources generated by a
distribution function and a scalar field, subject to the Vlasov and wave
equations respectively. The spacetime ... | [
{
"created": "Thu, 20 Jan 2005 13:20:56 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Tegankong",
"David",
""
]
] | We prove in the cases of plane and hyperbolic symmetries a global in time existence result in the future for comological solutions of the Einstein-Vlasov-scalar field system, with the sources generated by a distribution function and a scalar field, subject to the Vlasov and wave equations respectively. The spacetime is... |
2405.01835 | Parth Bambhaniya | Viraj Kalsariya, Parth Bambhaniya and Pankaj S. Joshi | Relativistic time delay analysis of pulsar signals near ultra-compact
objects | 11 pages, 6 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The upcoming discoveries of pulsars orbiting the center of the Milky Way will
present unparalleled opportunities to examine the causal structure of the
spacetime geometry of Sagittarius A*. In this paper, we investigate the fully
relativistic propagation time delay of pulsar signals in the
Joshi-Malafarina-Narayan (J... | [
{
"created": "Fri, 3 May 2024 03:57:25 GMT",
"version": "v1"
}
] | 2024-05-06 | [
[
"Kalsariya",
"Viraj",
""
],
[
"Bambhaniya",
"Parth",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | The upcoming discoveries of pulsars orbiting the center of the Milky Way will present unparalleled opportunities to examine the causal structure of the spacetime geometry of Sagittarius A*. In this paper, we investigate the fully relativistic propagation time delay of pulsar signals in the Joshi-Malafarina-Narayan (JMN... |
1410.4839 | Michele Vallisneri | Michele Vallisneri, Jonah Kanner, Roy Williams, Alan Weinstein and
Branson Stephens | The LIGO Open Science Center | 8 pages, 1 figure, proceedings of the 10th LISA Symposium, University
of Florida, Gainesville, May 18-23, 2014; final published version; see
losc.ligo.org for the S5 data release and more information about the LIGO
Open Science Center | null | 10.1088/1742-6596/610/1/012021 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LIGO Open Science Center (LOSC) fulfills LIGO's commitment to release,
archive, and serve LIGO data in a broadly accessible way to the scientific
community and to the public, and to provide the information and tools necessary
to understand and use the data. In August 2014, the LOSC published the full
dataset from... | [
{
"created": "Fri, 17 Oct 2014 20:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jan 2015 23:29:52 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Vallisneri",
"Michele",
""
],
[
"Kanner",
"Jonah",
""
],
[
"Williams",
"Roy",
""
],
[
"Weinstein",
"Alan",
""
],
[
"Stephens",
"Branson",
""
]
] | The LIGO Open Science Center (LOSC) fulfills LIGO's commitment to release, archive, and serve LIGO data in a broadly accessible way to the scientific community and to the public, and to provide the information and tools necessary to understand and use the data. In August 2014, the LOSC published the full dataset from I... |
1712.08543 | Christian Friedrich Steinwachs | Christian F. Steinwachs and Matthijs L. van der Wild | Quantum gravitational corrections from the Wheeler-DeWitt equation for
scalar-tensor theories | 33 pages, no figures, typos corrected, comments and references added,
published in CQG | null | 10.1088/1361-6382/aac587 | FR-PHENO-2017-026 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the canonical quantization of a general scalar-tensor theory and
derive the first quantum gravitational corrections following from a
semi-classical expansion of the Wheeler-DeWitt equation. The non-minimal
coupling of the scalar field to gravity induces a derivative coupling between
the scalar field and th... | [
{
"created": "Fri, 22 Dec 2017 16:10:45 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2018 10:28:44 GMT",
"version": "v2"
}
] | 2018-07-12 | [
[
"Steinwachs",
"Christian F.",
""
],
[
"van der Wild",
"Matthijs L.",
""
]
] | We perform the canonical quantization of a general scalar-tensor theory and derive the first quantum gravitational corrections following from a semi-classical expansion of the Wheeler-DeWitt equation. The non-minimal coupling of the scalar field to gravity induces a derivative coupling between the scalar field and the ... |
1806.04297 | Takeshi Chiba | Takeshi Chiba | Reconstructing $f(R)$ gravity from the spectral index | 8 pages, 2 figures, references added, version to appear in PTEP | PTEP 2018 (2018) 11, 113E01 | 10.1093/ptep/pty111 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent cosmological observations are in good agreement with the scalar
spectral index $n_s$ with $n_s-1\simeq -2/N$, where $N$ is the number of
e-foldings. In the previous work, the reconstruction of the inflaton potential
for a given $n_s$ was studied, and it was found that for $n_s-1=-2/N$, the
potential takes the ... | [
{
"created": "Tue, 12 Jun 2018 01:43:24 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Oct 2018 00:55:12 GMT",
"version": "v2"
}
] | 2018-11-21 | [
[
"Chiba",
"Takeshi",
""
]
] | Recent cosmological observations are in good agreement with the scalar spectral index $n_s$ with $n_s-1\simeq -2/N$, where $N$ is the number of e-foldings. In the previous work, the reconstruction of the inflaton potential for a given $n_s$ was studied, and it was found that for $n_s-1=-2/N$, the potential takes the fo... |
1707.08163 | Badri Krishnan | Sanjeev Dhurandhar, Badri Krishnan, Joshua L. Willis | Marginalizing the likelihood function for modeled gravitational wave
searches | 26 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Matched filtering is a commonly used technique in gravitational wave searches
for signals from compact binary systems and from rapidly rotating neutron
stars. A common issue in these searches is dealing with four extrinsic
parameters which do not affect the phase evolution of the system: the overall
amplitude, initia... | [
{
"created": "Tue, 25 Jul 2017 19:17:06 GMT",
"version": "v1"
}
] | 2017-07-27 | [
[
"Dhurandhar",
"Sanjeev",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Willis",
"Joshua L.",
""
]
] | Matched filtering is a commonly used technique in gravitational wave searches for signals from compact binary systems and from rapidly rotating neutron stars. A common issue in these searches is dealing with four extrinsic parameters which do not affect the phase evolution of the system: the overall amplitude, initial ... |
1608.01764 | Yun Soo Myung | Yun Soo Myung | Propagating degrees of freedom in f(R) gravity | 1+10 pages, no figure, published version in Adv. High Energy Phys | Adv.High Energy Phys. (2016) 3901734 | 10.1155/2016/3901734 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We have computed the number of polarization modes of gravitational waves
propagating in the Minkowski background in $f(R)$ gravity. This is three of two
from transverse-traceless tensor modes and one from a massive trace mode, which
confirms the results found in the literature. There is no massless breathing
mode and... | [
{
"created": "Fri, 5 Aug 2016 05:30:43 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2016 23:19:17 GMT",
"version": "v2"
}
] | 2016-12-23 | [
[
"Myung",
"Yun Soo",
""
]
] | We have computed the number of polarization modes of gravitational waves propagating in the Minkowski background in $f(R)$ gravity. This is three of two from transverse-traceless tensor modes and one from a massive trace mode, which confirms the results found in the literature. There is no massless breathing mode and t... |
2307.14228 | Elena V. Mikheeva | Elena V. Mikheeva, Serge Repin, Vladimir N. Lukash | Image of a black hole illuminated by a parabolic screen | 12 pages, 7 figures | null | null | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analytical model of a parabolic screen illuminating a black hole is
proposed. This allows to avoid naturally the appearance of edge effects
associated with photons moving along the plane of the screen. The temperature
distribution along the radius of the screen corresponds to that for a
relativistic disk (Novikov-... | [
{
"created": "Wed, 26 Jul 2023 14:50:13 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2024 11:37:41 GMT",
"version": "v2"
}
] | 2024-04-17 | [
[
"Mikheeva",
"Elena V.",
""
],
[
"Repin",
"Serge",
""
],
[
"Lukash",
"Vladimir N.",
""
]
] | An analytical model of a parabolic screen illuminating a black hole is proposed. This allows to avoid naturally the appearance of edge effects associated with photons moving along the plane of the screen. The temperature distribution along the radius of the screen corresponds to that for a relativistic disk (Novikov-Th... |
gr-qc/0310038 | Piotr Bizon | P. Bizo\'n, S. Szybka, A. Wassserman | Periodic self-similar wave maps coupled to gravity | 12 pages, 9 figures | Phys.Rev. D69 (2004) 064014 | 10.1103/PhysRevD.69.064014 | null | gr-qc | null | We continue our studies of spherically symmetric self-similar solutions in
the SU(2) sigma model coupled to gravity. Using mixed numerical and analytical
methods we show existence of an unstable periodic solution lying at the
boundary between the basins of two generic attractors.
| [
{
"created": "Tue, 7 Oct 2003 10:24:39 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bizoń",
"P.",
""
],
[
"Szybka",
"S.",
""
],
[
"Wassserman",
"A.",
""
]
] | We continue our studies of spherically symmetric self-similar solutions in the SU(2) sigma model coupled to gravity. Using mixed numerical and analytical methods we show existence of an unstable periodic solution lying at the boundary between the basins of two generic attractors. |
2110.04900 | Ibrahim Shehzad | Kartik Prabhu and Ibrahim Shehzad | Conservation of asymptotic charges from past to future null infinity:
Lorentz charges in general relativity | 42 pages; minor edits and additional clarifications compared to v1;
matches published version | JHEP 08 (2022) 029 | 10.1007/JHEP08(2022)029 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the asymptotic charges associated with Lorentz symmetries on
past and future null infinity match in the limit to spatial infinity in a class
of asymptotically-flat spacetimes. These are spacetimes that obey the
Ashtekar-Hansen definition of asymptotic flatness at null and spatial infinity
and satisfy an ... | [
{
"created": "Sun, 10 Oct 2021 20:41:17 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Aug 2022 05:13:43 GMT",
"version": "v2"
}
] | 2022-08-08 | [
[
"Prabhu",
"Kartik",
""
],
[
"Shehzad",
"Ibrahim",
""
]
] | We show that the asymptotic charges associated with Lorentz symmetries on past and future null infinity match in the limit to spatial infinity in a class of asymptotically-flat spacetimes. These are spacetimes that obey the Ashtekar-Hansen definition of asymptotic flatness at null and spatial infinity and satisfy an ad... |
2003.11901 | Swami Vivekanandji Chaurasia | Swami Vivekanandji Chaurasia, Tim Dietrich, Maximiliano Ujevic, Kai
Hendriks, Reetika Dudi, Francesco Maria Fabbri, Wolfgang Tichy, Bernd
Br\"ugmann | Gravitational waves and mass ejecta from binary neutron star mergers:
Effect of the spin orientation | 18 pages, 16 figures | Phys. Rev. D 102, 024087 (2020) | 10.1103/PhysRevD.102.024087 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue our study of the binary neutron star parameter space by
investigating the effect of the spin orientation on the dynamics, gravitational
wave emission, and mass ejection during the binary neutron star coalescence. We
simulate seven different configurations using multiple resolutions to allow a
reasonable e... | [
{
"created": "Thu, 26 Mar 2020 13:38:23 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2020 13:22:44 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Aug 2020 08:30:51 GMT",
"version": "v3"
}
] | 2020-08-21 | [
[
"Chaurasia",
"Swami Vivekanandji",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Ujevic",
"Maximiliano",
""
],
[
"Hendriks",
"Kai",
""
],
[
"Dudi",
"Reetika",
""
],
[
"Fabbri",
"Francesco Maria",
""
],
[
"Tichy",
"Wolfga... | We continue our study of the binary neutron star parameter space by investigating the effect of the spin orientation on the dynamics, gravitational wave emission, and mass ejection during the binary neutron star coalescence. We simulate seven different configurations using multiple resolutions to allow a reasonable err... |
1511.07120 | Paingalil Kunjan Suresh | N. Malsawmtluangi and P K Suresh | Oscillatory amplitude of stochastic gravitational wave spectrum | 16 pages, 8 figures, abstract rewritten, manuscript modified. To
appear in IJP | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial gravitational waves generated from early universe are placed in
the squeezed vacuum state and the resulting stochastic background is studied
for various models of the expanding universe. The quantum effect on the
stochastic gravitational waves leads to overall enhancement of the amplitude
and spectral ener... | [
{
"created": "Mon, 23 Nov 2015 06:43:25 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2017 06:23:40 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Feb 2022 14:46:24 GMT",
"version": "v3"
}
] | 2022-02-16 | [
[
"Malsawmtluangi",
"N.",
""
],
[
"Suresh",
"P K",
""
]
] | Primordial gravitational waves generated from early universe are placed in the squeezed vacuum state and the resulting stochastic background is studied for various models of the expanding universe. The quantum effect on the stochastic gravitational waves leads to overall enhancement of the amplitude and spectral energy... |
1506.05823 | Mart\'in G. Richarte MR | Luis P. Chimento and Mart\'in G. Richarte | Interacting realization of cosmological singularities with variable
vacuum energy | 10 pages, 1 figure. All comments are welcome | Phys. Rev. D 92, 043511 (2015) | 10.1103/PhysRevD.92.043511 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine an interacting dark matter--variable vacuum energy model for a
spatially flat Friedmann-Roberston-Walker spacetime, focusing on the appearance
of cosmological singularities such as \emph{big rip, big brake, big freeze},
and \emph{ big separation} along with abrupt events (\emph{infinite $\gamma$-
singulari... | [
{
"created": "Thu, 18 Jun 2015 21:18:24 GMT",
"version": "v1"
}
] | 2015-08-19 | [
[
"Chimento",
"Luis P.",
""
],
[
"Richarte",
"Martín G.",
""
]
] | We examine an interacting dark matter--variable vacuum energy model for a spatially flat Friedmann-Roberston-Walker spacetime, focusing on the appearance of cosmological singularities such as \emph{big rip, big brake, big freeze}, and \emph{ big separation} along with abrupt events (\emph{infinite $\gamma$- singularity... |
2101.03860 | Keisuke Izumi | Keisuke Izumi, Yoshimune Tomikawa, Tetsuya Shiromizu, Hirotaka Yoshino | Area bound for surfaces in generic gravitational field | 28 pages, 8 figures. This version has been accepted by PTEP | Progress of Theoretical and Experimental Physics, Volume 2021,
Issue 8, August 2021, 083E02 | 10.1093/ptep/ptab089 | OCU-PHYS-530, AP-GR-165 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define an attractive gravity probe surface (AGPS) as a compact 2-surface
$S_\alpha$ with positive mean curvature $k$ satisfying $r^a D_a k / k^2 \ge
\alpha$ (for a constant $\alpha>-1/2$) in the local inverse mean curvature
flow, where $r^a D_a k$ is the derivative of $k$ in the outward unit normal
direction. For ... | [
{
"created": "Mon, 11 Jan 2021 13:11:51 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 2021 09:45:08 GMT",
"version": "v2"
}
] | 2022-01-12 | [
[
"Izumi",
"Keisuke",
""
],
[
"Tomikawa",
"Yoshimune",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Yoshino",
"Hirotaka",
""
]
] | We define an attractive gravity probe surface (AGPS) as a compact 2-surface $S_\alpha$ with positive mean curvature $k$ satisfying $r^a D_a k / k^2 \ge \alpha$ (for a constant $\alpha>-1/2$) in the local inverse mean curvature flow, where $r^a D_a k$ is the derivative of $k$ in the outward unit normal direction. For as... |
1805.12329 | Alexander Pavlov E | Alexander Pavlov | Hidden symmetries in mixmaster-type universe | 10 pages, 2 figures, submitted to General Relativity and Gravitation
4 July 2017 | null | 10.1134/S0202289319010080 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model of multidimensional mixmaster-type vacuum universe is considered. It
belongs to a class of pseudo-Euclidean chains characterized by root vectors. An
algebraic approach of our investigation is founded on construction of Cartan
matrix of the spacelike root vectors in Wheeler -- DeWitt space. Kac -- Moody
algebr... | [
{
"created": "Thu, 31 May 2018 06:06:18 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Jul 2018 07:12:41 GMT",
"version": "v2"
}
] | 2019-04-17 | [
[
"Pavlov",
"Alexander",
""
]
] | A model of multidimensional mixmaster-type vacuum universe is considered. It belongs to a class of pseudo-Euclidean chains characterized by root vectors. An algebraic approach of our investigation is founded on construction of Cartan matrix of the spacelike root vectors in Wheeler -- DeWitt space. Kac -- Moody algebras... |
gr-qc/0401040 | Deborah A. Konkowski | D.A. Konkowski and T.M. Helliwell | Definition and classification of singularities in GR: classical and
quantum | 3 pages, no figures, submitted to Proceedings of the Tenth Marcel
Grossmann Meeting on General Relativity, Rio de Janeiro, July 20-26, 2003 | null | 10.1142/9789812704030_0242 | null | gr-qc | null | We will briefly review the definition and classification of classical and
quantum singularities in general relativity. Examples of classically singular
spacetimes that do not have quantum singularities will be given. We will
present results on quantum singularities in quasiregular spacetimes. We will
also show that a... | [
{
"created": "Sat, 10 Jan 2004 23:53:38 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Konkowski",
"D. A.",
""
],
[
"Helliwell",
"T. M.",
""
]
] | We will briefly review the definition and classification of classical and quantum singularities in general relativity. Examples of classically singular spacetimes that do not have quantum singularities will be given. We will present results on quantum singularities in quasiregular spacetimes. We will also show that a s... |
2111.06095 | Sergey Bondarenko | S. Bondarenko | Dynamical signature: complex manifolds, gauge fields and non-flat
tangent space | 18 pages | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | Theoretical possibilities of models of gravity with dynamical signature are
discussed. The different scenarios of the signature change are proposed in the
framework of Einstein-Cartan gravity. We consider, subsequently, the dynamical
signature in the model of the complex manifold with complex coordinates and
complex ... | [
{
"created": "Thu, 11 Nov 2021 08:12:25 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Nov 2021 10:20:45 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jan 2022 08:48:51 GMT",
"version": "v3"
},
{
"created": "Mon, 12 Sep 2022 06:00:59 GMT",
"version": "v4"
}
] | 2022-09-13 | [
[
"Bondarenko",
"S.",
""
]
] | Theoretical possibilities of models of gravity with dynamical signature are discussed. The different scenarios of the signature change are proposed in the framework of Einstein-Cartan gravity. We consider, subsequently, the dynamical signature in the model of the complex manifold with complex coordinates and complex me... |
1907.11082 | Andrea Geralico | Donato Bini, Andrea Geralico | New gravitational self-force analytical results for eccentric equatorial
orbits around a Kerr black hole: gyroscope precession | 19 pages, revtex macros | Phys. Rev. D 100, 104003 (2019) | 10.1103/PhysRevD.100.104003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically compute the gravitational self-force correction to the
gyroscope precession along slightly eccentric equatorial orbits in the Kerr
spacetime, generalizing previous results for the Schwarzschild spacetime. Our
results are accurate through the 9.5 post-Newtonian order and to second order
in both eccentr... | [
{
"created": "Tue, 23 Jul 2019 20:32:02 GMT",
"version": "v1"
}
] | 2019-11-13 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | We analytically compute the gravitational self-force correction to the gyroscope precession along slightly eccentric equatorial orbits in the Kerr spacetime, generalizing previous results for the Schwarzschild spacetime. Our results are accurate through the 9.5 post-Newtonian order and to second order in both eccentric... |
1712.00766 | Fangyu Li | Fang-Yu Li, Hao Wen, Zhen-Yun Fang, Di Li, Tong-Jie Zhang | Electromagnetic counterparts of high-frequency gravitational waves
having additional polarization states: distinguishing and probing
tensor-mode, vector-mode and scalar-mode gravitons | 27 pages, 16 figures | Eur. Phys. J. C (2020) 80:879 | 10.1140/epjc/s10052-020-08429-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GWs from extra dimensions, very early universe, and some high-energy
astrophysical process, might have at most six polarizations: plus- and
cross-type (tensor-mode gravitons), x-, y-type (vector-mode), and b-, l-type
(scalar-mode). Peak or partial peak regions of some of such GWs are just
distributed in GHz or higher... | [
{
"created": "Sun, 3 Dec 2017 13:24:39 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Dec 2017 08:22:13 GMT",
"version": "v2"
},
{
"created": "Thu, 3 May 2018 11:36:19 GMT",
"version": "v3"
},
{
"created": "Mon, 26 Nov 2018 15:41:56 GMT",
"version": "v4"
},
{
"cre... | 2021-12-23 | [
[
"Li",
"Fang-Yu",
""
],
[
"Wen",
"Hao",
""
],
[
"Fang",
"Zhen-Yun",
""
],
[
"Li",
"Di",
""
],
[
"Zhang",
"Tong-Jie",
""
]
] | GWs from extra dimensions, very early universe, and some high-energy astrophysical process, might have at most six polarizations: plus- and cross-type (tensor-mode gravitons), x-, y-type (vector-mode), and b-, l-type (scalar-mode). Peak or partial peak regions of some of such GWs are just distributed in GHz or higher f... |
1509.05110 | Rashmi Uniyal | Rashmi Uniyal, Anindya Biswas, Hemwati Nandan and K. D. Purohit | Geodesic motion in R- charged black hole space-times | 32 pages, 16 captioned figures | Phys. Rev. D 92, 084023 (2015) | 10.1103/PhysRevD.92.084023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the geodesic motion of massive and massless test particles in the
background of a particular class of multiple charge black holes in gauged
supergravity theories in D = 4. We have analysed the horizon structure along
with the nature of the effective potentials for the case of four equal charges.
In view of t... | [
{
"created": "Thu, 17 Sep 2015 03:13:24 GMT",
"version": "v1"
}
] | 2015-10-13 | [
[
"Uniyal",
"Rashmi",
""
],
[
"Biswas",
"Anindya",
""
],
[
"Nandan",
"Hemwati",
""
],
[
"Purohit",
"K. D.",
""
]
] | We study the geodesic motion of massive and massless test particles in the background of a particular class of multiple charge black holes in gauged supergravity theories in D = 4. We have analysed the horizon structure along with the nature of the effective potentials for the case of four equal charges. In view of the... |
gr-qc/9901075 | Jolien Creighton | Jolien D. E. Creighton | Data analysis strategies for the detection of gravitational waves in
non-Gaussian noise | 5 pages RevTeX, 4 figures | Phys.Rev.D60:021101,1999 | 10.1103/PhysRevD.60.021101 | null | gr-qc | null | In order to analyze data produced by the kilometer-scale gravitational wave
detectors that will begin operation early next century, one needs to develop
robust statistical tools capable of extracting weak signals from the detector
noise. This noise will likely have non-stationary and non-Gaussian components.
To facil... | [
{
"created": "Tue, 26 Jan 1999 18:04:36 GMT",
"version": "v1"
}
] | 2010-01-06 | [
[
"Creighton",
"Jolien D. E.",
""
]
] | In order to analyze data produced by the kilometer-scale gravitational wave detectors that will begin operation early next century, one needs to develop robust statistical tools capable of extracting weak signals from the detector noise. This noise will likely have non-stationary and non-Gaussian components. To facilit... |
0704.0278 | Igor Khavkine | Igor Khavkine, J. Daniel Christensen | q-Deformed spin foam models of quantum gravity | 21 pages, 6 figures, amsrefs | Class.Quant.Grav.24:3271-3290,2007 | 10.1088/0264-9381/24/13/009 | null | gr-qc | null | We numerically study Barrett-Crane models of Riemannian quantum gravity. We
have extended the existing numerical techniques to handle q-deformed models and
arbitrary space-time triangulations. We present and interpret expectation
values of a few selected observables for each model, including a spin-spin
correlation f... | [
{
"created": "Mon, 2 Apr 2007 22:08:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Khavkine",
"Igor",
""
],
[
"Christensen",
"J. Daniel",
""
]
] | We numerically study Barrett-Crane models of Riemannian quantum gravity. We have extended the existing numerical techniques to handle q-deformed models and arbitrary space-time triangulations. We present and interpret expectation values of a few selected observables for each model, including a spin-spin correlation fun... |
gr-qc/0005097 | Clarissa-Marie Claudel | Clarissa-Marie Claudel | Cumulative gravitational lensing in Newtonian perturbations of
Friedman-Robertson-Walker cosmologies | 28 pages. LaTeX2e. Uses the following packages: amsmath, amsthm,
amssymb, amsfonts, mathrsfs | Proc.Roy.Soc.Lond. A456 (2000) 1455-1482 | 10.1098/rspa.2000.0571 | null | gr-qc | null | It is a common assumption amongst astronomers that, in the determination of
the distances of remote sources from their apparent brightness, the cumulative
gravitational lensing due to the matter in all the galaxies is the same, on
average, as if the matter were uniformly distributed throughout the cosmos. The
validit... | [
{
"created": "Mon, 22 May 2000 09:30:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Claudel",
"Clarissa-Marie",
""
]
] | It is a common assumption amongst astronomers that, in the determination of the distances of remote sources from their apparent brightness, the cumulative gravitational lensing due to the matter in all the galaxies is the same, on average, as if the matter were uniformly distributed throughout the cosmos. The validity ... |
gr-qc/9504034 | User Tns | A.E.Pavlov | The Mixmaster Cosmological Model as a Pseudo-Euclidean Generalized Toda
Chain | 11 pages, LaTex, no figures | null | null | null | gr-qc | null | The question of the integrability of the mixmaster model of the Universe,
presented as a dynamical system with finite degrees of freedom, is investigated
in present paper. As far as the model belongs to the class of pseudo-Euclidean
generalized Toda chains, the method of getting Kovalevskaya exponents developed
for c... | [
{
"created": "Fri, 21 Apr 1995 11:38:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pavlov",
"A. E.",
""
]
] | The question of the integrability of the mixmaster model of the Universe, presented as a dynamical system with finite degrees of freedom, is investigated in present paper. As far as the model belongs to the class of pseudo-Euclidean generalized Toda chains, the method of getting Kovalevskaya exponents developed for cha... |
1103.0984 | Vasileios Paschalidis | Vasileios Paschalidis, Seyyed M. H. Halataei, Stuart L. Shapiro and
Ignacy Sawicki | Constraint propagation equations of the 3+1 decomposition of f(R)
gravity | 25 pages, matches published version in CQG, references updated | Class.Quant.Grav.28:085006,2011 | 10.1088/0264-9381/28/8/085006 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories of gravity other than general relativity (GR) can explain the
observed cosmic acceleration without a cosmological constant. One such class of
theories of gravity is f(R). Metric f(R) theories have been proven to be
equivalent to Brans-Dicke (BD) scalar-tensor gravity without a kinetic term.
Using this equiva... | [
{
"created": "Fri, 4 Mar 2011 21:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Mar 2011 15:13:30 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Paschalidis",
"Vasileios",
""
],
[
"Halataei",
"Seyyed M. H.",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Sawicki",
"Ignacy",
""
]
] | Theories of gravity other than general relativity (GR) can explain the observed cosmic acceleration without a cosmological constant. One such class of theories of gravity is f(R). Metric f(R) theories have been proven to be equivalent to Brans-Dicke (BD) scalar-tensor gravity without a kinetic term. Using this equivale... |
2105.13972 | Banafsheh Shiralilou | Banafsheh Shiralilou, Tanja Hinderer, Samaya Nissanke, N\'estor Ortiz,
Helvi Witek | Post-Newtonian Gravitational and Scalar Waves in Scalar-Gauss-Bonnet
Gravity | 45 pages, 5 figures, comments welcome | null | 10.1088/1361-6382/ac4196 | null | gr-qc astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves emitted by black hole binary inspiral and mergers enable
unprecedented strong-field tests of gravity, requiring accurate theoretical
modelling of the expected signals in extensions of General Relativity. In this
paper we model the gravitational wave emission of inspiraling binaries in
scalar Gauss... | [
{
"created": "Fri, 28 May 2021 16:52:39 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jun 2021 09:32:01 GMT",
"version": "v2"
}
] | 2022-02-02 | [
[
"Shiralilou",
"Banafsheh",
""
],
[
"Hinderer",
"Tanja",
""
],
[
"Nissanke",
"Samaya",
""
],
[
"Ortiz",
"Néstor",
""
],
[
"Witek",
"Helvi",
""
]
] | Gravitational waves emitted by black hole binary inspiral and mergers enable unprecedented strong-field tests of gravity, requiring accurate theoretical modelling of the expected signals in extensions of General Relativity. In this paper we model the gravitational wave emission of inspiraling binaries in scalar Gauss-B... |
0708.2558 | Raymond Burston | R. B. Burston | 1+1+2 gravitational perturbations on LRS class II space-times: GEM
vector harmonic amplitudes | null | null | null | null | gr-qc | null | This is the second in a series of papers which considers first-order
gauge-invariant and covariant gravitational perturbations to locally
rotationally symmetric (LRS) class II space-times. This paper shows how to
decouple a complex combination of the gravito-electromagnetic (GEM) 2-vectors
with the 2-tensors describi... | [
{
"created": "Sun, 19 Aug 2007 19:42:17 GMT",
"version": "v1"
}
] | 2007-08-21 | [
[
"Burston",
"R. B.",
""
]
] | This is the second in a series of papers which considers first-order gauge-invariant and covariant gravitational perturbations to locally rotationally symmetric (LRS) class II space-times. This paper shows how to decouple a complex combination of the gravito-electromagnetic (GEM) 2-vectors with the 2-tensors describing... |
2210.06082 | M.J. Luo | M.J.Luo | Quantum Modified Gravity at Low Energy in the Ricci Flow of Quantum
Spacetime | 19 pages, 2 figures. Version to appear in International Journal of
Theoretical Physics | Int. J. Theor. Phys. 62, 91 (2023) | 10.1007/s10773-023-05341-9 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum treatment of physical reference frame leads to the Ricci flow of
quantum spacetime, which is a quite rigid framework to quantum and
renormalization effect of gravity. The theory has a low characteristic energy
scale described by a unique constant: the critical density of the universe. At
low energy long dista... | [
{
"created": "Wed, 12 Oct 2022 10:56:00 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Apr 2023 08:44:21 GMT",
"version": "v2"
}
] | 2023-04-27 | [
[
"Luo",
"M. J.",
""
]
] | Quantum treatment of physical reference frame leads to the Ricci flow of quantum spacetime, which is a quite rigid framework to quantum and renormalization effect of gravity. The theory has a low characteristic energy scale described by a unique constant: the critical density of the universe. At low energy long distanc... |
1808.09318 | David Delphenich | D. H. Delphenich | Teleparallelism as anholonomic geometry | 20 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometry of parallelizable manifolds is presented from the standpoint of
regarding it as conventional (e.g., Euclidian or Minkowskian) geometry, when it
is described with respect to an anholonomic frame field that is defined on the
space in question.
| [
{
"created": "Tue, 28 Aug 2018 14:17:54 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Delphenich",
"D. H.",
""
]
] | The geometry of parallelizable manifolds is presented from the standpoint of regarding it as conventional (e.g., Euclidian or Minkowskian) geometry, when it is described with respect to an anholonomic frame field that is defined on the space in question. |
1801.06788 | Louis H. Kauffman | A. M. Deakin and L. H. Kauffman | Cosmological Theories Of The Extra Terms | 95 pages, 3 figures, pdf document | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper purports to have: Introduced a new formulation of Quantum
Mechanics, explained the apparent disconnect between Quantum Mechanics and
General Relativity, explained the observed far field expansion of the Universe
(Dark Energy), supplied an argument which goes towards explaining away Dark
Matter (there are m... | [
{
"created": "Sun, 21 Jan 2018 08:37:21 GMT",
"version": "v1"
}
] | 2018-01-23 | [
[
"Deakin",
"A. M.",
""
],
[
"Kauffman",
"L. H.",
""
]
] | This paper purports to have: Introduced a new formulation of Quantum Mechanics, explained the apparent disconnect between Quantum Mechanics and General Relativity, explained the observed far field expansion of the Universe (Dark Energy), supplied an argument which goes towards explaining away Dark Matter (there are mod... |
1710.01978 | Adri\`a G\'omez-Valent | Adri\`a G\'omez-Valent | Vacuum energy in Quantum Field Theory and Cosmology | PhD thesis. Sections 7.5.2, 8.4, and final conclusions slightly
extended, references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis we present detailed analyses on various running vacuum models
(RVM's), in which the vacuum energy density "runs" with the cosmic expansion.
The RVM's are motivated from the renormalization group formalism of Quantum
Field Theory in curved spacetime. In this theoretical framework, the vacuum
energy dens... | [
{
"created": "Thu, 5 Oct 2017 12:01:50 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Oct 2017 11:32:59 GMT",
"version": "v2"
}
] | 2017-10-20 | [
[
"Gómez-Valent",
"Adrià",
""
]
] | In this thesis we present detailed analyses on various running vacuum models (RVM's), in which the vacuum energy density "runs" with the cosmic expansion. The RVM's are motivated from the renormalization group formalism of Quantum Field Theory in curved spacetime. In this theoretical framework, the vacuum energy densit... |
gr-qc/9806056 | Robert Mann | I.S. Booth and R.B. Mann | Cosmological Pair Production of Charged and Rotating Black Holes | Latex, 49 pages, 9 figures, uses psfig, typos corrected in eqns 107,
108 and between eqns 92 and 93. References updated | Nucl.Phys. B539 (1999) 267-306 | 10.1016/S0550-3213(98)00756-1 | WATPHYS-TH98/04 | gr-qc | null | We investigate the general process of black hole pair creation in a
cosmological background, considering the creation of charged and rotating black
holes. We motivate the use of Kerr-Newmann-deSitter solutions to investigate
this process, showing how they arise from more general C-metric type solutions
that describe ... | [
{
"created": "Thu, 11 Jun 1998 20:04:30 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 1999 19:47:50 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Booth",
"I. S.",
""
],
[
"Mann",
"R. B.",
""
]
] | We investigate the general process of black hole pair creation in a cosmological background, considering the creation of charged and rotating black holes. We motivate the use of Kerr-Newmann-deSitter solutions to investigate this process, showing how they arise from more general C-metric type solutions that describe a ... |
2106.09193 | Tatsuya Narikawa | Tatsuya Narikawa, Nami Uchikata, Takahiro Tanaka | Gravitational-wave constraints on the GWTC-2 events by measuring the
tidal deformability and the spin-induced quadrupole moment | 13 pages, 6 figures. Accepted for publication in Physical Review D.
We have implemented the complete GW tidal phase for the mass quadrupole
interactions and used it in our analyses | Phys. Rev. D 104, 084056 (2021) | 10.1103/PhysRevD.104.084056 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from compact binary coalescences provide a unique
laboratory to test properties of compact objects. As alternatives to the
ordinary black holes in general relativity, various exotic compact objects have
been proposed. Some of them have largely different values of the tidal
deformability and spin-i... | [
{
"created": "Thu, 17 Jun 2021 01:00:50 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2021 07:23:36 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Sep 2021 07:36:43 GMT",
"version": "v3"
},
{
"created": "Sun, 26 Sep 2021 08:12:58 GMT",
"version": "v4"
}
] | 2021-10-18 | [
[
"Narikawa",
"Tatsuya",
""
],
[
"Uchikata",
"Nami",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | Gravitational waves from compact binary coalescences provide a unique laboratory to test properties of compact objects. As alternatives to the ordinary black holes in general relativity, various exotic compact objects have been proposed. Some of them have largely different values of the tidal deformability and spin-ind... |
2307.09536 | Marcos A Anacleto | M. A. Anacleto, J. A. V. Campos, F. A. Brito, E. Maciel, E. Passos | Scattering and absorption by extra-dimensional black holes with GUP | 19 pages, 10 figures | NPB, 116617 (2024) | 10.1016/j.nuclphysb.2024.116617 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we consider the Schwarzschild-Tangherlini black hole to
investigate the process of scalar wave scattering by the black hole in a
spacetime of (d + 1) dimensions and also with the generalized uncertainty
principle (GUP). In this scenario, we analytically determine the phase shift
and explore the effect ... | [
{
"created": "Tue, 18 Jul 2023 18:25:44 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2024 14:32:50 GMT",
"version": "v2"
}
] | 2024-07-11 | [
[
"Anacleto",
"M. A.",
""
],
[
"Campos",
"J. A. V.",
""
],
[
"Brito",
"F. A.",
""
],
[
"Maciel",
"E.",
""
],
[
"Passos",
"E.",
""
]
] | In this paper, we consider the Schwarzschild-Tangherlini black hole to investigate the process of scalar wave scattering by the black hole in a spacetime of (d + 1) dimensions and also with the generalized uncertainty principle (GUP). In this scenario, we analytically determine the phase shift and explore the effect of... |
2010.03754 | Li Tang | Hai-Nan Lin, Xin Li, Li Tang | Strongly lensed gravitational waves as the probes to test the cosmic
distance duality relation | 8 pages, 3 figures | Chinese Physics C 45, 015109 (2021) | 10.1088/1674-1137/abc53a | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmic distance relation (DDR) associates the angular diameters distance
($D_A$) and luminosity distance ($D_L$) by a simple formula, i.e.,
$D_L=(1+z)^2D_A$. The strongly lensed gravitational waves (GWs) provide a
unique way to measure $D_A$ and $D_L$ simultaneously to the GW source, hence
can be used as probes t... | [
{
"created": "Thu, 8 Oct 2020 04:14:49 GMT",
"version": "v1"
}
] | 2021-01-19 | [
[
"Lin",
"Hai-Nan",
""
],
[
"Li",
"Xin",
""
],
[
"Tang",
"Li",
""
]
] | The cosmic distance relation (DDR) associates the angular diameters distance ($D_A$) and luminosity distance ($D_L$) by a simple formula, i.e., $D_L=(1+z)^2D_A$. The strongly lensed gravitational waves (GWs) provide a unique way to measure $D_A$ and $D_L$ simultaneously to the GW source, hence can be used as probes to ... |
1105.1987 | J. Mark Heinzle | J. Mark Heinzle | Constant mean curvature slicings of Kantowski-Sachs spacetimes | null | Phys. Rev. D 83, 084004 (2011) [15 pages] | 10.1103/PhysRevD.83.084004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate existence, uniqueness, and the asymptotic properties of
constant mean curvature (CMC) slicings in vacuum Kantowski-Sachs spacetimes
with positive cosmological constant. Since these spacetimes violate the strong
energy condition, most of the general theorems on CMC slicings do not apply.
Although there ... | [
{
"created": "Tue, 10 May 2011 16:10:03 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Heinzle",
"J. Mark",
""
]
] | We investigate existence, uniqueness, and the asymptotic properties of constant mean curvature (CMC) slicings in vacuum Kantowski-Sachs spacetimes with positive cosmological constant. Since these spacetimes violate the strong energy condition, most of the general theorems on CMC slicings do not apply. Although there ar... |
1602.01474 | T. Padmanabhan | T. Padmanabhan | Exploring the Nature of Gravity | Elaborates on the results presented in five recent talks: Keynote
address in (i) EmQM15, Vienna, 23-25 Oct, 2015; Plenary talks in (ii) 35th
Max Born Symposium - The Planck Scale II, Wroclaw, 7-12 Sept, 2015 and (iii)
ICGC-2015, Mohali, 14-16 Dec 2015; Colloquia at (iv) IAP, Paris, 30 Oct 2015
and (v) TIFR, Mum... | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I clarify the differences between various approaches in the literature which
attempt to link gravity and thermodynamics. I then describe a new perspective
based on the following features: (1) As in the case of any other matter field,
the gravitational field equations should also remain unchanged if a constant is
adde... | [
{
"created": "Wed, 3 Feb 2016 21:00:08 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Feb 2016 08:32:00 GMT",
"version": "v2"
}
] | 2016-02-09 | [
[
"Padmanabhan",
"T.",
""
]
] | I clarify the differences between various approaches in the literature which attempt to link gravity and thermodynamics. I then describe a new perspective based on the following features: (1) As in the case of any other matter field, the gravitational field equations should also remain unchanged if a constant is added ... |
1205.4570 | Kourosh Nozari | A. Behboodi, S. Akhshabi and K. Nozari | Matter stability in modified teleparallel gravity | 12 pages, one eps figure, Final Revised Version | Phys. Lett. B 718 (2012) 30 | 10.1016/j.physletb.2012.10.026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the matter stability in modified teleparallel gravity or $f(T)$
theories. We show that there is no Dolgov-Kawasaki instability in these types
of modified teleparallel gravity theories. This give the $f(T)$ theories a
great advantage over their $f(R)$ counterparts because from the stability point
of view ther... | [
{
"created": "Mon, 21 May 2012 11:51:20 GMT",
"version": "v1"
},
{
"created": "Sat, 26 May 2012 06:40:25 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Oct 2012 18:00:42 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Behboodi",
"A.",
""
],
[
"Akhshabi",
"S.",
""
],
[
"Nozari",
"K.",
""
]
] | We study the matter stability in modified teleparallel gravity or $f(T)$ theories. We show that there is no Dolgov-Kawasaki instability in these types of modified teleparallel gravity theories. This give the $f(T)$ theories a great advantage over their $f(R)$ counterparts because from the stability point of view there ... |
1808.02381 | Tomohiro Fujita | Tomohiro Fujita, Sachiko Kuroyanagi, Shuntaro Mizuno and Shinji
Mukohyama | Blue-tilted Primordial Gravitational Waves from Massive Gravity | 6 pages, 2 figures | null | 10.1016/j.physletb.2018.12.025 | YITP-18-84, IPMU18-0129 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a theory of massive tensor gravitons which predicts blue-tilted and
largely amplified primordial gravitational waves. After inflation, while their
mass is significant until it diminishes to a small value, gravitons are diluted
as non-relativistic matter and hence their amplitude can be substantially
amplifie... | [
{
"created": "Mon, 6 Aug 2018 04:24:53 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2018 07:20:56 GMT",
"version": "v2"
}
] | 2018-12-19 | [
[
"Fujita",
"Tomohiro",
""
],
[
"Kuroyanagi",
"Sachiko",
""
],
[
"Mizuno",
"Shuntaro",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | We study a theory of massive tensor gravitons which predicts blue-tilted and largely amplified primordial gravitational waves. After inflation, while their mass is significant until it diminishes to a small value, gravitons are diluted as non-relativistic matter and hence their amplitude can be substantially amplified ... |
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