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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9905082 | null | Reginald T. Cahill, Christopher M. Klinger (Department of Physics,
Flinders University) | Self-Referential Noise as a Fundamental Aspect of Reality | 7 pages, Latex, 3 ps figures. Contribution to the 2nd International
Conference on Unsolved Problems of Noise, Adelaide 1999 | Proc. 2nd Int. Conf. on Unsolved Problems of Noise and
Fluctuations (UPON 99), eds. D. Abbott and L. Kish, Adelaide, Australia,
11-15th July 1999, Vol. 511, p.43, American Institute of Physics, New York,
2000 | 10.1063/1.60018 | null | gr-qc | null | Noise is often used in the study of open systems, such as in classical
Brownian motion and in Quantum Dynamics, to model the influence of the
environment. However generalising results from G\"{o}del and Chaitin in
mathematics suggests that systems that are sufficiently rich that
self-referencing is possible contain i... | [
{
"created": "Fri, 21 May 1999 03:58:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Cahill",
"Reginald T.",
"",
"Department of Physics,\n Flinders University"
],
[
"Klinger",
"Christopher M.",
"",
"Department of Physics,\n Flinders University"
]
] | Noise is often used in the study of open systems, such as in classical Brownian motion and in Quantum Dynamics, to model the influence of the environment. However generalising results from G\"{o}del and Chaitin in mathematics suggests that systems that are sufficiently rich that self-referencing is possible contain int... |
1110.0646 | Gaurav Khanna | David Brizuela, Daniel Cartin and Gaurav Khanna | Numerical Techniques in Loop Quantum Cosmology | null | SIGMA 8 (2012), 001, 26 pages | 10.3842/SIGMA.2012.001 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | In this article, we review the use of numerical techniques to obtain
solutions for the quantum Hamiltonian constraint in loop quantum cosmology
(LQC). First, we summarize the basic features of LQC, and describe features of
the constraint equations to solve - generically, these are difference (rather
than differential... | [
{
"created": "Tue, 4 Oct 2011 11:46:04 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jan 2012 07:54:58 GMT",
"version": "v2"
}
] | 2012-01-04 | [
[
"Brizuela",
"David",
""
],
[
"Cartin",
"Daniel",
""
],
[
"Khanna",
"Gaurav",
""
]
] | In this article, we review the use of numerical techniques to obtain solutions for the quantum Hamiltonian constraint in loop quantum cosmology (LQC). First, we summarize the basic features of LQC, and describe features of the constraint equations to solve - generically, these are difference (rather than differential) ... |
1704.03351 | Lavinia Heisenberg | Jose Beltran Jimenez, Lavinia Heisenberg, Gonzalo J. Olmo and Diego
Rubiera-Garcia | Born-Infeld inspired modifications of gravity | 212 pages, Review under press at Physics Reports | null | 10.1016/j.physrep.2017.11.001 | IFIC/17-23 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity has shown an outstanding observational success in the
scales where it has been directly tested. However, modifications have been
intensively explored in the regimes where it seems either incomplete or signals
its own limit of validity. In particular, the breakdown of unitarity near the
Planck scale... | [
{
"created": "Tue, 11 Apr 2017 15:20:28 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2017 06:53:07 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Jimenez",
"Jose Beltran",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] | General Relativity has shown an outstanding observational success in the scales where it has been directly tested. However, modifications have been intensively explored in the regimes where it seems either incomplete or signals its own limit of validity. In particular, the breakdown of unitarity near the Planck scale s... |
gr-qc/9910069 | Panagiota Kanti | P. Kanti (Univ. of Minnesota) and E. Winstanley (Univ. of Oxford) | Do stringy corrections stabilize coloured black holes? | 17 pages, Revtex, comments and a reference added, version to appear
in Physical Review D | Phys.Rev. D61 (2000) 084032 | 10.1103/PhysRevD.61.084032 | UMN-TH-1823/99, TPI-MINN-99/48, OUTP-99-51-P | gr-qc astro-ph hep-ph hep-th | null | We consider hairy black hole solutions of Einstein-Yang-Mills-Dilaton theory,
coupled to a Gauss-Bonnet curvature term, and we study their stability under
small, spacetime-dependent perturbations. We demonstrate that the stringy
corrections do not remove the sphaleronic instabilities of the coloured black
holes with ... | [
{
"created": "Wed, 20 Oct 1999 21:22:59 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2000 22:39:05 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kanti",
"P.",
"",
"Univ. of Minnesota"
],
[
"Winstanley",
"E.",
"",
"Univ. of Oxford"
]
] | We consider hairy black hole solutions of Einstein-Yang-Mills-Dilaton theory, coupled to a Gauss-Bonnet curvature term, and we study their stability under small, spacetime-dependent perturbations. We demonstrate that the stringy corrections do not remove the sphaleronic instabilities of the coloured black holes with th... |
1802.05095 | Manuel Rodrigues | Manuel E. Rodrigues and Marcos V. de S. Silva | Bardeen Regular Black Hole With an Electric Source | 9 pages, 8 figures | JCAP06(2018)025 | 10.1088/1475-7516/2018/06/025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If some energy conditions on the stress-energy tensor are violated, is
possible construct regular black holes in General Relativity and in alternative
theories of gravity. This type of solution has horizons but does not present
singularities. The first regular black hole was presented by Bardeen and can be
obtained f... | [
{
"created": "Wed, 14 Feb 2018 13:56:03 GMT",
"version": "v1"
}
] | 2018-06-18 | [
[
"Rodrigues",
"Manuel E.",
""
],
[
"Silva",
"Marcos V. de S.",
""
]
] | If some energy conditions on the stress-energy tensor are violated, is possible construct regular black holes in General Relativity and in alternative theories of gravity. This type of solution has horizons but does not present singularities. The first regular black hole was presented by Bardeen and can be obtained fro... |
1803.03521 | Robert J. Hardwick | Robert J. Hardwick | Multiple spectator condensates from inflation | 18 pages, 10 figures, paragraph added to match published version in
JCAP | JCAP 05 (2018) 054 | 10.1088/1475-7516/2018/05/054 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the development of spectator (light test) field condensates
due to their quantum fluctuations in a de Sitter inflationary background,
making use of the stochastic formalism to describe the system. In this context,
a condensate refers to the typical field value found after coarse-graining
using the Hubb... | [
{
"created": "Thu, 8 Mar 2018 15:35:42 GMT",
"version": "v1"
},
{
"created": "Mon, 21 May 2018 13:59:57 GMT",
"version": "v2"
}
] | 2018-06-06 | [
[
"Hardwick",
"Robert J.",
""
]
] | We investigate the development of spectator (light test) field condensates due to their quantum fluctuations in a de Sitter inflationary background, making use of the stochastic formalism to describe the system. In this context, a condensate refers to the typical field value found after coarse-graining using the Hubble... |
gr-qc/9508008 | Gregory A. Burnett | Gregory A. Burnett | Collapsing regions and black hole formation | 11 pages, REVTeX 3.0 | J.Math.Phys. 37 (1996) 1434-1448 | 10.1063/1.531442 | UF-RAP-95-33 | gr-qc | null | Up to a conjecture in Riemannian geometry, we significantly strengthen a
recent theorem of Eardley by proving that a compact region in an initial data
surface that is collapsing sufficiently fast in comparison to its
surface-to-volume ratio must contain a future trapped region. In addition to
establishing this strong... | [
{
"created": "Fri, 4 Aug 1995 03:32:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Burnett",
"Gregory A.",
""
]
] | Up to a conjecture in Riemannian geometry, we significantly strengthen a recent theorem of Eardley by proving that a compact region in an initial data surface that is collapsing sufficiently fast in comparison to its surface-to-volume ratio must contain a future trapped region. In addition to establishing this stronger... |
1010.3816 | Gaurav Khanna | Niket K. Choudhary, Rakesh Ginjupalli, Sandeep Navada and Gaurav
Khanna | An Exploration of OpenCL for a Numerical Relativity Application | 6 pages, 1 table; Accepted for publication in Parallel and
Distributed Computing and Systems (PDCS 2011) | null | null | null | gr-qc cs.DC physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Currently there is considerable interest in making use of many-core processor
architectures, such as Nvidia and AMD graphics processing units (GPUs) for
scientific computing. In this work we explore the use of the Open Computing
Language (OpenCL) for a typical Numerical Relativity application: a time-domain
Teukolsky... | [
{
"created": "Tue, 19 Oct 2010 07:05:20 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2011 19:15:52 GMT",
"version": "v2"
}
] | 2011-10-04 | [
[
"Choudhary",
"Niket K.",
""
],
[
"Ginjupalli",
"Rakesh",
""
],
[
"Navada",
"Sandeep",
""
],
[
"Khanna",
"Gaurav",
""
]
] | Currently there is considerable interest in making use of many-core processor architectures, such as Nvidia and AMD graphics processing units (GPUs) for scientific computing. In this work we explore the use of the Open Computing Language (OpenCL) for a typical Numerical Relativity application: a time-domain Teukolsky e... |
2106.06740 | Abhik Kumar Sanyal Dr. | Dalia Saha, Mohosin Alam, Ranajit Mandal and Abhik Kumar Sanyal | Conflict between some higher-order curvature invariant terms | 18 pages, 0 figures | Nuclear Physics B 973 (2021) 115570 | 10.1016/j.nuclphysb.2021.115570 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A viable quantum theory does not allow curvature invariant terms of different
higher orders to be accommodated in the gravitational action. We show that
there is indeed a conflict between the curvature squared and Gauss-Bonnet
squared terms from the point of view of hermiticity. This means one should
choose either, i... | [
{
"created": "Sat, 12 Jun 2021 10:54:33 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jul 2021 16:05:47 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Oct 2021 14:42:55 GMT",
"version": "v3"
}
] | 2021-10-27 | [
[
"Saha",
"Dalia",
""
],
[
"Alam",
"Mohosin",
""
],
[
"Mandal",
"Ranajit",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | A viable quantum theory does not allow curvature invariant terms of different higher orders to be accommodated in the gravitational action. We show that there is indeed a conflict between the curvature squared and Gauss-Bonnet squared terms from the point of view of hermiticity. This means one should choose either, in ... |
1001.2550 | J. -F. Pascual-Sanchez | J.-F. Pascual-S\'anchez, A. San Miguel and F. Vicente | Curvature(s) of a light wavefront in a weak gravitational field | 3 pages, 1 fig, Talk given by JFPS at the 12th Marcel Grossmann
conference (Paris, July, 2009), submitted to the Proceedings | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometry of a light wavefront evolving from a flat wavefront under the
action of weak gravity field in the 3-space associated to a post-Newtonian
relativistic spacetime, is studied numerically by means of the ray tracing
method.
| [
{
"created": "Thu, 14 Jan 2010 20:29:14 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Pascual-Sánchez",
"J. -F.",
""
],
[
"Miguel",
"A. San",
""
],
[
"Vicente",
"F.",
""
]
] | The geometry of a light wavefront evolving from a flat wavefront under the action of weak gravity field in the 3-space associated to a post-Newtonian relativistic spacetime, is studied numerically by means of the ray tracing method. |
1012.3556 | Edgar Leon | E. A. Leon, J. A. Nieto, R. Nunez-Lopez, A. Lipovka | Higher Dimensional Cosmology: Relations among the radii of two
homogeneous spaces | 13 pages, 3 figures. Two references added, minor typos corrected. To
be published in Modern Physics Letters A | Mod.Phys.Lett.A26:805-814,2011 | 10.1142/S0217732311035316 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a cosmological model in 1+D+d dimensions where D dimensions are
associated with the usual Friedman-Robertson-Walker type metric with radio a(t)
and d dimensions corresponds to an additional homogeneous space with radio
b(t). We make a general analysis of the field equations and then we obtain
solutions invol... | [
{
"created": "Thu, 16 Dec 2010 11:05:13 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Dec 2010 00:30:35 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Apr 2011 22:27:26 GMT",
"version": "v3"
}
] | 2011-04-20 | [
[
"Leon",
"E. A.",
""
],
[
"Nieto",
"J. A.",
""
],
[
"Nunez-Lopez",
"R.",
""
],
[
"Lipovka",
"A.",
""
]
] | We study a cosmological model in 1+D+d dimensions where D dimensions are associated with the usual Friedman-Robertson-Walker type metric with radio a(t) and d dimensions corresponds to an additional homogeneous space with radio b(t). We make a general analysis of the field equations and then we obtain solutions involvi... |
1907.09503 | Yolbeiker Rodr\'iguez Baez | Radouane Gannouji, Yolbeiker Rodr\'iguez Baez, Naresh Dadhich | Pure Lovelock black hole in the dimension, $d=3N+1$, is stable | 7 pages, 4 figures, v2 accepted for publication in PRD, conclusions
unchanged | Phys. Rev. D 100, 084011 (2019) | 10.1103/PhysRevD.100.084011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show that pure Lovelock static Schwarzschild's analogue
black hole in dimensions $d>3N+1$, where $N$ is the degree of Lovelock
polynomial action, is stable even though pure Gauss-Bonnet $N=2$ black hole is
unstable in dimension $d<7$. We also discuss and compare quasinormal modes for
pure Lovelock an... | [
{
"created": "Mon, 22 Jul 2019 18:09:50 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2019 11:54:31 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Gannouji",
"Radouane",
""
],
[
"Baez",
"Yolbeiker Rodríguez",
""
],
[
"Dadhich",
"Naresh",
""
]
] | In this paper we show that pure Lovelock static Schwarzschild's analogue black hole in dimensions $d>3N+1$, where $N$ is the degree of Lovelock polynomial action, is stable even though pure Gauss-Bonnet $N=2$ black hole is unstable in dimension $d<7$. We also discuss and compare quasinormal modes for pure Lovelock and ... |
gr-qc/0701055 | Vratko Pol\'ak | Vratko Pol\'ak and Vladim\'ir Balek | Plane waves in a relativistic homogeneous and isotropic elastic
continuum | 12 pages, 1 figure; section 4 extended, minor changes elsewhere,
author added | Class.Quant.Grav.25:045007,2008 | 10.1088/0264-9381/25/4/045007 | null | gr-qc | null | Propagation of gravitational and acoustic plane waves in a flat universe
filled with a general relativistic, homogeneous and isotropic, spatially flat
continuum is studied. The continuum is described by analogues of
nonrelativistic characteristics, namely energy per particle, pressure and Lame
coefficients, and consi... | [
{
"created": "Wed, 10 Jan 2007 16:17:27 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2007 19:33:26 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Polák",
"Vratko",
""
],
[
"Balek",
"Vladimír",
""
]
] | Propagation of gravitational and acoustic plane waves in a flat universe filled with a general relativistic, homogeneous and isotropic, spatially flat continuum is studied. The continuum is described by analogues of nonrelativistic characteristics, namely energy per particle, pressure and Lame coefficients, and conside... |
2312.03757 | Adri\'an Casado-Turri\'on | Adri\'an Casado-Turri\'on | Compact objects in modified gravity: junction conditions and other
viability criteria | PhD Thesis, Universidad Complutense de Madrid. Defended in November
2023. 190 pages, 7 figures, 4 tables; Based on arXiv:2202.04439,
arXiv:2303.01206 and arXiv:2303.02103 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis aims at improving our understanding of the strong-field regime of
gravity, where deviations from General Relativity (GR) are expected to be found
on theoretical grounds. In particular, we have been concerned with the
formulation and application of junction conditions (which govern stellar
collapse, black-... | [
{
"created": "Mon, 4 Dec 2023 21:47:43 GMT",
"version": "v1"
}
] | 2023-12-08 | [
[
"Casado-Turrión",
"Adrián",
""
]
] | This thesis aims at improving our understanding of the strong-field regime of gravity, where deviations from General Relativity (GR) are expected to be found on theoretical grounds. In particular, we have been concerned with the formulation and application of junction conditions (which govern stellar collapse, black-ho... |
2005.00982 | Ali \"Ovg\"un Dr. | Ali \"Ovg\"un and \.Izzet Sakall{\i} | Testing Generalized Einstein-Cartan-Kibble-Sciama Gravity using Weak
Deflection Angle and Shadow Cast | 16 pages. Accepted for publication in Classical and Quantum Gravity | Class. Quantum Grav. 37 225003 (2020) | 10.1088/1361-6382/abb579 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we use a new asymptotically flat and spherically symmetric
solution in the generalized Einstein-Cartan-Kibble-Sciama (ECKS) theory of
gravity to study the weak gravitational lensing and its shadow cast. To this
end, we first compute the weak deflection angle of generalized ECKS black hole
using the Gau... | [
{
"created": "Sun, 3 May 2020 04:27:54 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2020 09:14:22 GMT",
"version": "v2"
}
] | 2020-10-21 | [
[
"Övgün",
"Ali",
""
],
[
"Sakallı",
"İzzet",
""
]
] | In this paper, we use a new asymptotically flat and spherically symmetric solution in the generalized Einstein-Cartan-Kibble-Sciama (ECKS) theory of gravity to study the weak gravitational lensing and its shadow cast. To this end, we first compute the weak deflection angle of generalized ECKS black hole using the Gauss... |
gr-qc/0409061 | Alejandro Perez | Alejandro Perez | Introduction to Loop Quantum Gravity and Spin Foams | Lectures presented at the II International Conference of Fundamental
Interactions, Pedra Azul, Brazil, June 2004. Typos corrected | null | null | null | gr-qc hep-th | null | These notes are a didactic overview of the non perturbative and background
independent approach to a quantum theory of gravity known as loop quantum
gravity. The definition of real connection variables for general relativity,
used as a starting point in the program, is described in a simple manner. The
main ideas lea... | [
{
"created": "Wed, 15 Sep 2004 19:01:58 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2004 23:54:26 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Feb 2005 10:49:34 GMT",
"version": "v3"
}
] | 2009-09-29 | [
[
"Perez",
"Alejandro",
""
]
] | These notes are a didactic overview of the non perturbative and background independent approach to a quantum theory of gravity known as loop quantum gravity. The definition of real connection variables for general relativity, used as a starting point in the program, is described in a simple manner. The main ideas leadi... |
2206.03609 | Rafael Hern\'andez-Jim\'enez | Rafael Hern\'andez-Jim\'enez, Claudia Moreno, Mauricio Bellini, C.
Ortiz | Cosmological Boundary Flux Parameter | 15 pages, 6 figures | Phys.Dark Univ. 38 (2022) 101137 | 10.1016/j.dark.2022.101137 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The {\it{Cosmological Boundary Flux Parameter}} is a novel proposal that
attempts to explain the origin of the cosmological parameter $\Lambda$ purely
by geometric nature. Then we implement this new approach to a flat FLRW
universe along with a barotropic fluid. We present an ansatz in which $\Lambda$
is straightforw... | [
{
"created": "Tue, 7 Jun 2022 22:23:40 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Sep 2022 03:44:35 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Dec 2022 14:22:35 GMT",
"version": "v3"
}
] | 2022-12-29 | [
[
"Hernández-Jiménez",
"Rafael",
""
],
[
"Moreno",
"Claudia",
""
],
[
"Bellini",
"Mauricio",
""
],
[
"Ortiz",
"C.",
""
]
] | The {\it{Cosmological Boundary Flux Parameter}} is a novel proposal that attempts to explain the origin of the cosmological parameter $\Lambda$ purely by geometric nature. Then we implement this new approach to a flat FLRW universe along with a barotropic fluid. We present an ansatz in which $\Lambda$ is straightforwar... |
1706.00743 | Przemyslaw Malkiewicz | Przemys{\l}aw Ma{\l}kiewicz and Artur Miroszewski | Internal clock formulation of quantum mechanics | 13 pages, 5 figures | Phys. Rev. D 96, 046003 (2017) | 10.1103/PhysRevD.96.046003 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The basic tenet of the present work is the assumption of the lack of external
and fixed time in the Universe. This assumption is best embodied by general
relativity, which replaces the fixed space-time structure with the
gravitational field, which is subject to dynamics. The lack of time does not
imply the lack of ev... | [
{
"created": "Fri, 2 Jun 2017 16:28:42 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Sep 2017 10:08:15 GMT",
"version": "v2"
}
] | 2017-09-19 | [
[
"Małkiewicz",
"Przemysław",
""
],
[
"Miroszewski",
"Artur",
""
]
] | The basic tenet of the present work is the assumption of the lack of external and fixed time in the Universe. This assumption is best embodied by general relativity, which replaces the fixed space-time structure with the gravitational field, which is subject to dynamics. The lack of time does not imply the lack of evol... |
1705.00817 | Hongwei Tan | Hongwei Tan, Jinbo Yang, Jingyi Zhang, and Tangmei He | The global monopole spacetime and its topological charge | null | null | 10.1088/1674-1056/27/3/030401 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we show that the global monopole spacetime is one of the exact
solutions of Einstein equations by means of the method treating the matter
field as a non-linear sigma model, without the weak field approximation applied
in the original derivation by Barriola and Vilenkin in 1989. Furthermore, we
find the... | [
{
"created": "Tue, 2 May 2017 06:44:08 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2017 00:50:11 GMT",
"version": "v2"
},
{
"created": "Fri, 12 May 2017 14:53:08 GMT",
"version": "v3"
},
{
"created": "Sat, 26 Aug 2017 01:29:10 GMT",
"version": "v4"
},
{
"cre... | 2018-02-13 | [
[
"Tan",
"Hongwei",
""
],
[
"Yang",
"Jinbo",
""
],
[
"Zhang",
"Jingyi",
""
],
[
"He",
"Tangmei",
""
]
] | In this paper, we show that the global monopole spacetime is one of the exact solutions of Einstein equations by means of the method treating the matter field as a non-linear sigma model, without the weak field approximation applied in the original derivation by Barriola and Vilenkin in 1989. Furthermore, we find the p... |
gr-qc/0503116 | Sashideep Gutti | T.P.Singh, Sashideep Gutti, Rakesh Tibrewala | Quantum Mechanics without spacetime V - Why a quantum theory of gravity
should be non-linear- | slightly expanded version; clarifying comments added; conclusions
unchanged; 12 pages | null | null | null | gr-qc hep-th quant-ph | null | If there exists a formulation of quantum mechanics which does not refer to a
background classical spacetime manifold, it then follows as a consequence,
(upon making one plausible assumption), that a quantum description of gravity
should be necessarily non-linear. This is true independent of the mathematical
structure... | [
{
"created": "Wed, 30 Mar 2005 12:14:33 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2005 10:36:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Singh",
"T. P.",
""
],
[
"Gutti",
"Sashideep",
""
],
[
"Tibrewala",
"Rakesh",
""
]
] | If there exists a formulation of quantum mechanics which does not refer to a background classical spacetime manifold, it then follows as a consequence, (upon making one plausible assumption), that a quantum description of gravity should be necessarily non-linear. This is true independent of the mathematical structure u... |
2404.17055 | Olzhas Mukazhanov | Olzhas Mukazhanov, Rittick Roy, Temurbek Mirzaev, Cosimo Bambi | Numerical parameterization of stationary axisymmetric black holes in a
theory agnostic framework | 9 pages, 9 figures, 2 tables, accepted for publication in PRD | Phys. Rev. D 110, 024060 (2024) | 10.1103/PhysRevD.110.024060 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The pursuit of a comprehensive theory of gravity has led to the exploration
of various alternative models, necessitating a model-independent framework. The
Konoplya-Rezzolla-Zhidenko (KRZ) parameterization offers a robust method for
approximating stationary axisymmetric black hole spacetimes, characterized by a
rapid... | [
{
"created": "Thu, 25 Apr 2024 21:40:45 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2024 14:48:51 GMT",
"version": "v2"
}
] | 2024-07-24 | [
[
"Mukazhanov",
"Olzhas",
""
],
[
"Roy",
"Rittick",
""
],
[
"Mirzaev",
"Temurbek",
""
],
[
"Bambi",
"Cosimo",
""
]
] | The pursuit of a comprehensive theory of gravity has led to the exploration of various alternative models, necessitating a model-independent framework. The Konoplya-Rezzolla-Zhidenko (KRZ) parameterization offers a robust method for approximating stationary axisymmetric black hole spacetimes, characterized by a rapidly... |
2204.08245 | Marek Li\v{s}ka | Ana Alonso-Serrano, Luis J. Garay, Marek Li\v{s}ka | Noether charge formalism for Weyl transverse gravity | 36 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Weyl transverse gravity is a gravitational theory that is invariant under
transverse diffeomorphisms and Weyl transformations. It is characterised by
having the same classical solutions as general relativity while solving some of
its issues with the cosmological constant. In this work, we first find the
Noether curre... | [
{
"created": "Mon, 18 Apr 2022 10:45:16 GMT",
"version": "v1"
}
] | 2022-04-19 | [
[
"Alonso-Serrano",
"Ana",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Liška",
"Marek",
""
]
] | Weyl transverse gravity is a gravitational theory that is invariant under transverse diffeomorphisms and Weyl transformations. It is characterised by having the same classical solutions as general relativity while solving some of its issues with the cosmological constant. In this work, we first find the Noether current... |
0809.3615 | Gustavo Dotti | Gustavo Dotti and Reinaldo J. Gleiser | The initial value problem for linearized gravitational perturbations of
the Schwarzschild naked singularity | typos corrected, references added | null | 10.1088/0264-9381/26/21/215002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The coupled equations for the scalar modes of the linearized Einstein
equations around Schwarzschild's spacetime were reduced by Zerilli to a 1+1
wave equation with a potential $V$, on a field $\Psi_z$. For smooth metric
perturbations $\Psi_z$ is singular at $r_s=-6M/(\ell-1)(\ell+2)$, $\ell$ the
mode harmonic number... | [
{
"created": "Sun, 21 Sep 2008 20:36:05 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jun 2009 14:29:33 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Sep 2009 18:32:36 GMT",
"version": "v3"
}
] | 2015-05-13 | [
[
"Dotti",
"Gustavo",
""
],
[
"Gleiser",
"Reinaldo J.",
""
]
] | The coupled equations for the scalar modes of the linearized Einstein equations around Schwarzschild's spacetime were reduced by Zerilli to a 1+1 wave equation with a potential $V$, on a field $\Psi_z$. For smooth metric perturbations $\Psi_z$ is singular at $r_s=-6M/(\ell-1)(\ell+2)$, $\ell$ the mode harmonic number, ... |
2110.07644 | Merced Montesinos | Merced Montesinos, Diego Gonzalez | Generalizations of the Nieh-Yan topological invariant | It matches published version | Phys. Rev. D 104, 084020 (2021) | 10.1103/PhysRevD.104.084020 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report new topological invariants in four dimensions that are
generalizations of the Nieh-Yan topological invariant. The new topological
invariants are obtained through a systematic method along the lines of the one
used to get the Nieh-Yan form, but involving an $SO(4,1)$ [$SO(5)$] connection
constructed out from... | [
{
"created": "Thu, 14 Oct 2021 18:05:33 GMT",
"version": "v1"
}
] | 2021-10-18 | [
[
"Montesinos",
"Merced",
""
],
[
"Gonzalez",
"Diego",
""
]
] | We report new topological invariants in four dimensions that are generalizations of the Nieh-Yan topological invariant. The new topological invariants are obtained through a systematic method along the lines of the one used to get the Nieh-Yan form, but involving an $SO(4,1)$ [$SO(5)$] connection constructed out from a... |
0910.3656 | Denis Pollney | Denis Pollney, Christian Reisswig, Nils Dorband, Erik Schnetter, Peter
Diener | The Asymptotic Falloff of Local Waveform Measurements in Numerical
Relativity | null | Phys.Rev.D80:121502,2009 | 10.1103/PhysRevD.80.121502 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | We examine current numerical relativity computations of gravitational waves,
which typically determine the asymptotic waves at infinity by extrapolation
from finite (small) radii. Using simulations of a black hole binary with
accurate wave extraction at $r=1000M$, we show that extrapolations from the
near-zone are se... | [
{
"created": "Mon, 19 Oct 2009 19:32:17 GMT",
"version": "v1"
}
] | 2009-12-31 | [
[
"Pollney",
"Denis",
""
],
[
"Reisswig",
"Christian",
""
],
[
"Dorband",
"Nils",
""
],
[
"Schnetter",
"Erik",
""
],
[
"Diener",
"Peter",
""
]
] | We examine current numerical relativity computations of gravitational waves, which typically determine the asymptotic waves at infinity by extrapolation from finite (small) radii. Using simulations of a black hole binary with accurate wave extraction at $r=1000M$, we show that extrapolations from the near-zone are self... |
1005.2090 | Etera R. Livine | Laurent Freidel, Etera R. Livine | U(N) Coherent States for Loop Quantum Gravity | 23 pages | J. Math. Phys. 52: 052502,2011 | 10.1063/1.3587121 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the geometry of the space of N-valent SU(2)-intertwiners. We
propose a new set of holomorphic operators acting on this space and a new set
of coherent states which are covariant under U(N) transformations. These states
are labeled by elements of the Grassmannian Gr(N,2), they possess a direct
geometric... | [
{
"created": "Wed, 12 May 2010 13:28:03 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Freidel",
"Laurent",
""
],
[
"Livine",
"Etera R.",
""
]
] | We investigate the geometry of the space of N-valent SU(2)-intertwiners. We propose a new set of holomorphic operators acting on this space and a new set of coherent states which are covariant under U(N) transformations. These states are labeled by elements of the Grassmannian Gr(N,2), they possess a direct geometrical... |
1803.07849 | Cosimo Bambi | Menglei Zhou, Zheng Cao, Askar Abdikamalov, Dimitry Ayzenberg, Cosimo
Bambi, Leonardo Modesto, Sourabh Nampalliwar | Testing conformal gravity with the supermassive black hole in 1H0707-495 | 6 pages, 2 figures. v2: refereed version | Phys. Rev. D 98, 024007 (2018) | 10.1103/PhysRevD.98.024007 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, two of us have found a family of singularity-free rotating black
hole solutions in Einstein's conformal gravity. These spacetimes are
characterized by three parameters: the black hole mass $M$, the black hole spin
angular momentum $J$, and a parameter $L$ that is not specified by the theory
but can be expec... | [
{
"created": "Wed, 21 Mar 2018 10:54:33 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jul 2018 14:43:49 GMT",
"version": "v2"
}
] | 2018-07-06 | [
[
"Zhou",
"Menglei",
""
],
[
"Cao",
"Zheng",
""
],
[
"Abdikamalov",
"Askar",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Modesto",
"Leonardo",
""
],
[
"Nampalliwar",
"Sourabh",
""
]
... | Recently, two of us have found a family of singularity-free rotating black hole solutions in Einstein's conformal gravity. These spacetimes are characterized by three parameters: the black hole mass $M$, the black hole spin angular momentum $J$, and a parameter $L$ that is not specified by the theory but can be expecte... |
1401.8166 | Sergio Dain | Sergio Dain | Geometric inequalities for black holes | Invited review article for General Relativity and Gravitation. Based
on my plenary lecture at GR20 and the longer review article Classical and
Quantum Gravity, 29(7):073001, 2012, arXiv:1111.3615. 27 pages. 14 figures.
Minor changes | null | 10.1007/s10714-014-1715-1 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the three parameters that characterize the Kerr black
hole (mass, angular momentum and horizon area) satisfy several important
inequalities. Remarkably, some of these inequalities remain valid also for
dynamical black holes. This kind of inequalities play an important role in the
characterizatio... | [
{
"created": "Fri, 31 Jan 2014 14:03:56 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Mar 2014 20:36:58 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Dain",
"Sergio",
""
]
] | It is well known that the three parameters that characterize the Kerr black hole (mass, angular momentum and horizon area) satisfy several important inequalities. Remarkably, some of these inequalities remain valid also for dynamical black holes. This kind of inequalities play an important role in the characterization ... |
gr-qc/0210011 | Viqar Husain | V. Husain, G. Kunstatter, B. Preston and M. Birukou | Anti-deSitter gravitational collapse | 4 pages, 2 figures, revtex4, version to appear in CQG | Class.Quant.Grav.20:L23-L30,2003 | 10.1088/0264-9381/20/4/101 | null | gr-qc hep-th physics.comp-ph | null | We describe a formalism for studying spherically symmetric collapse of the
massless scalar field in any spacetime dimension, and for any value of the
cosmological constant $\Lambda$. The formalism is used for numerical
simulations of gravitational collapse in four spacetime dimensions with
negative $\Lambda$. We obse... | [
{
"created": "Thu, 3 Oct 2002 19:32:44 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2003 16:11:42 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Husain",
"V.",
""
],
[
"Kunstatter",
"G.",
""
],
[
"Preston",
"B.",
""
],
[
"Birukou",
"M.",
""
]
] | We describe a formalism for studying spherically symmetric collapse of the massless scalar field in any spacetime dimension, and for any value of the cosmological constant $\Lambda$. The formalism is used for numerical simulations of gravitational collapse in four spacetime dimensions with negative $\Lambda$. We observ... |
1605.01659 | Mariano Bauer | M. Bauer | Quantum Gravity and a Time Operator in Relativistic Quantum Mechanics | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of time in the quantization of gravity arises from the fact that
time in Schroedinger's equation is a parameter. This sets time apart from the
spatial coordinates, represented by operators in quantum mechanics (QM). Thus
"time" in QM and "time" in General Relativity (GR) are seen as mutually
incompatible ... | [
{
"created": "Thu, 5 May 2016 17:26:44 GMT",
"version": "v1"
}
] | 2016-05-06 | [
[
"Bauer",
"M.",
""
]
] | The problem of time in the quantization of gravity arises from the fact that time in Schroedinger's equation is a parameter. This sets time apart from the spatial coordinates, represented by operators in quantum mechanics (QM). Thus "time" in QM and "time" in General Relativity (GR) are seen as mutually incompatible no... |
1511.03223 | Pedro Pina Avelino | P. P. Avelino | Inner Structure of Black Holes in Eddington-inspired Born-Infeld
gravity: the role of mass inflation | 7 pages, 6 figures | Phys. Rev. D 93, 044067 (2016) | 10.1103/PhysRevD.93.044067 | null | gr-qc astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the interior dynamics of accreting black holes in
Eddington-inspired Born-Infeld gravity using the homogeneous approximation and
taking charge as a surrogate for angular momentum, showing that accretion can
have an enormous impact on their inner structure. We find that, unlike in
general relativity, th... | [
{
"created": "Tue, 10 Nov 2015 18:47:43 GMT",
"version": "v1"
}
] | 2016-03-02 | [
[
"Avelino",
"P. P.",
""
]
] | We investigate the interior dynamics of accreting black holes in Eddington-inspired Born-Infeld gravity using the homogeneous approximation and taking charge as a surrogate for angular momentum, showing that accretion can have an enormous impact on their inner structure. We find that, unlike in general relativity, ther... |
1702.05239 | Peter Hintz | Peter Hintz | Uniqueness of Kerr-Newman-de Sitter black holes with small angular
momenta | 10 pages, 1 figure. v2 is the published version, with updated
bibliography | Ann. Henri Poincare, 19(2):607-617, 2018 | 10.1007/s00023-017-0633-7 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a stationary solution of the Einstein-Maxwell equations which is
close to a non-degenerate Reissner-Nordstr\"om-de Sitter solution is in fact
equal to a slowly rotating Kerr-Newman-de Sitter solution. The proof uses the
non-linear stability of the Kerr-Newman-de Sitter family of black holes for
small ang... | [
{
"created": "Fri, 17 Feb 2017 07:02:54 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2020 15:28:39 GMT",
"version": "v2"
}
] | 2020-05-28 | [
[
"Hintz",
"Peter",
""
]
] | We show that a stationary solution of the Einstein-Maxwell equations which is close to a non-degenerate Reissner-Nordstr\"om-de Sitter solution is in fact equal to a slowly rotating Kerr-Newman-de Sitter solution. The proof uses the non-linear stability of the Kerr-Newman-de Sitter family of black holes for small angul... |
2103.16225 | Philip Relton | Philip Relton, Vivien Raymond | Parameter Estimation Bias From Overlapping Binary Black Hole Events In
Second Generation Interferometers | 17 pages, 14 figures. Updated submission to better match published
version. Some references have been updated, most plots have been updated
after sampling reruns. The probability of overlap section has also been
changed to cover an improved method with updated numbers | Phys. Rev. D 104, 084039 (2021) | 10.1103/PhysRevD.104.084039 | LIGO-P2100074 | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Since the initial detection of Gravitational Waves in 2015, 50 candidate
events have been reported by the LIGO-Virgo-KAGRA collaboration. As the current
generation of detectors move towards their design sensitivity the rate of these
detections will increase. The next generation of detectors are likely to have
high en... | [
{
"created": "Tue, 30 Mar 2021 10:13:52 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2022 12:33:06 GMT",
"version": "v2"
}
] | 2022-02-16 | [
[
"Relton",
"Philip",
""
],
[
"Raymond",
"Vivien",
""
]
] | Since the initial detection of Gravitational Waves in 2015, 50 candidate events have been reported by the LIGO-Virgo-KAGRA collaboration. As the current generation of detectors move towards their design sensitivity the rate of these detections will increase. The next generation of detectors are likely to have high enou... |
2011.14629 | Olivier Minazzoli | Denis Arruga, Olivier Rousselle, Olivier Minazzoli | Compact Objects in Entangled Relativity | 9 pages, 7 figures | Phys. Rev. D 103, 024034 (2021) | 10.1103/PhysRevD.103.024034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the first numerical Tolman-Oppenheimer-Volkoff solutions of
compact objects in entangled relativity, which is an alternative to the
framework of general relativity that does not have any additional free
parameter. Assuming a simple polytropic equation of state and the conservation
of the rest-mass density... | [
{
"created": "Mon, 30 Nov 2020 09:10:30 GMT",
"version": "v1"
}
] | 2021-01-20 | [
[
"Arruga",
"Denis",
""
],
[
"Rousselle",
"Olivier",
""
],
[
"Minazzoli",
"Olivier",
""
]
] | We describe the first numerical Tolman-Oppenheimer-Volkoff solutions of compact objects in entangled relativity, which is an alternative to the framework of general relativity that does not have any additional free parameter. Assuming a simple polytropic equation of state and the conservation of the rest-mass density, ... |
1701.03642 | Olivier Piguet | Ivan Morales, Bruno Neves, Zui Oporto and Olivier Piguet | Chern-Simons Gravity in Four Dimensions | 25 pages, Latex | null | 10.1140/epjc/s10052-017-4653-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Five dimensional Chern-Simons theory with (anti-)de Sitter SO(1,5) or SO(2,4)
gauge invariance presents an alternative to General Relativity with
cosmological constant. We consider the zero-modes of its Kaluza-Klein
compactification to four dimensions. Solutions with vanishing torsion are
obtained in the cases of a s... | [
{
"created": "Fri, 13 Jan 2017 12:25:05 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Morales",
"Ivan",
""
],
[
"Neves",
"Bruno",
""
],
[
"Oporto",
"Zui",
""
],
[
"Piguet",
"Olivier",
""
]
] | Five dimensional Chern-Simons theory with (anti-)de Sitter SO(1,5) or SO(2,4) gauge invariance presents an alternative to General Relativity with cosmological constant. We consider the zero-modes of its Kaluza-Klein compactification to four dimensions. Solutions with vanishing torsion are obtained in the cases of a sph... |
2210.12502 | Arnab Sarkar | Arnab Sarkar, Amna Ali, K. Rajesh Nayak, and A. S. Majumdar | Enhanced power of gravitational waves and rapid coalescence of black
hole binaries through dark energy accretion | 9 pages, 6 figures, 1 Table | null | 10.1103/PhysRevD.107.084038 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the accretion of dark energy by constituent black holes in binary
formations during the present epoch of the Universe. In the context of an
observationally consistent dark energy model, we evaluate the growth of black
holes' masses due to accretion. We show that accretion leads to faster
circularization o... | [
{
"created": "Sat, 22 Oct 2022 17:18:33 GMT",
"version": "v1"
}
] | 2023-05-10 | [
[
"Sarkar",
"Arnab",
""
],
[
"Ali",
"Amna",
""
],
[
"Nayak",
"K. Rajesh",
""
],
[
"Majumdar",
"A. S.",
""
]
] | We consider the accretion of dark energy by constituent black holes in binary formations during the present epoch of the Universe. In the context of an observationally consistent dark energy model, we evaluate the growth of black holes' masses due to accretion. We show that accretion leads to faster circularization of ... |
2103.03802 | Thomas Mieling | Thomas Mieling | The Response of Laser Interferometric Gravitational Wave Detectors
Beyond the Eikonal Equation | 40 pages, 6 figures | Class. Quantum Grav. 38 (2021) 175007 | 10.1088/1361-6382/ac15db | null | gr-qc physics.optics | http://creativecommons.org/licenses/by/4.0/ | The response of Michelson interferometers to weak plane gravitational waves
is computed at one order of accuracy beyond the eikonal equation. The
modulation of the electromagnetic field amplitude and polarisation are taken
into account by solving the transport equations of geometrical optics with
boundary conditions ... | [
{
"created": "Fri, 5 Mar 2021 17:05:29 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2021 16:31:35 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Aug 2021 08:20:19 GMT",
"version": "v3"
}
] | 2021-08-12 | [
[
"Mieling",
"Thomas",
""
]
] | The response of Michelson interferometers to weak plane gravitational waves is computed at one order of accuracy beyond the eikonal equation. The modulation of the electromagnetic field amplitude and polarisation are taken into account by solving the transport equations of geometrical optics with boundary conditions ad... |
2102.07034 | Haroldo Cilas Duarte Lima Junior | Haroldo C. D. Lima Junior, Lu\'is C. B. Crispino, Pedro V. P. Cunha
and Carlos A. R. Herdeiro | Can different black holes cast the same shadow? | Matches the version published in Physical Review D, title changed,
typos corrected, 16 pages, 8 figures | Phys. Rev. D 103, 084040 (2021) | 10.1103/PhysRevD.103.084040 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the following question: may two different black holes (BHs) cast
exactly the same shadow? In spherical symmetry, we show the necessary and
sufficient condition for a static BH to be shadow-degenerate with Schwarzschild
is that the dominant photonsphere of both has the same impact parameter, when
corrected... | [
{
"created": "Sat, 13 Feb 2021 23:56:55 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 2021 18:05:12 GMT",
"version": "v2"
}
] | 2021-04-28 | [
[
"Junior",
"Haroldo C. D. Lima",
""
],
[
"Crispino",
"Luís C. B.",
""
],
[
"Cunha",
"Pedro V. P.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
]
] | We consider the following question: may two different black holes (BHs) cast exactly the same shadow? In spherical symmetry, we show the necessary and sufficient condition for a static BH to be shadow-degenerate with Schwarzschild is that the dominant photonsphere of both has the same impact parameter, when corrected f... |
gr-qc/0204073 | Luciano Rezzolla | L. Rezzolla and O. Zanotti | New Relativistic Effects in the Dynamics of Nonlinear Hydrodynamical
Waves | 4 pages, 5 figures | Phys.Rev.Lett. 89 (2002) 114501 | 10.1103/PhysRevLett.89.114501 | null | gr-qc astro-ph physics.flu-dyn | null | In Newtonian and relativistic hydrodynamics the Riemann problem consists of
calculating the evolution of a fluid which is initially characterized by two
states having different values of uniform rest-mass density, pressure and
velocity. When the fluid is allowed to relax, one of three possible
wave-patterns is produc... | [
{
"created": "Tue, 23 Apr 2002 17:03:28 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Rezzolla",
"L.",
""
],
[
"Zanotti",
"O.",
""
]
] | In Newtonian and relativistic hydrodynamics the Riemann problem consists of calculating the evolution of a fluid which is initially characterized by two states having different values of uniform rest-mass density, pressure and velocity. When the fluid is allowed to relax, one of three possible wave-patterns is produced... |
0805.4169 | Th. M. Nieuwenhuizen | Theo M. Nieuwenhuizen | Exact solution for the interior of a black hole | 12 pages newFNLstyle. 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the Relativistic Theory of Gravitation it is shown that the equation
of state $p=\rho$ holds near the center of a black hole. For the stiff equation
of state $p=\rho-\rho_c$ the interior metric is solved exactly. It is matched
with the Schwarzschild metric, which is deformed in a narrow range beyond the
horizo... | [
{
"created": "Tue, 27 May 2008 16:34:39 GMT",
"version": "v1"
}
] | 2008-05-28 | [
[
"Nieuwenhuizen",
"Theo M.",
""
]
] | Within the Relativistic Theory of Gravitation it is shown that the equation of state $p=\rho$ holds near the center of a black hole. For the stiff equation of state $p=\rho-\rho_c$ the interior metric is solved exactly. It is matched with the Schwarzschild metric, which is deformed in a narrow range beyond the horizon.... |
1703.10812 | Edward Wilson-Ewing | David Langlois, Hongguang Liu, Karim Noui, Edward Wilson-Ewing | Effective loop quantum cosmology as a higher-derivative scalar-tensor
theory | 22 pages. v2: minor clarifications added, references updated | Class.Quant.Grav.34:225004 (2017) | 10.1088/1361-6382/aa8f2f | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Chamseddine and Mukhanov introduced a higher-derivative
scalar-tensor theory which leads to a modified Friedmann equation allowing for
bouncing solutions. As we note in the present work, this Friedmann equation
turns out to reproduce exactly the loop quantum cosmology effective dynamics
for a flat isotropic... | [
{
"created": "Fri, 31 Mar 2017 09:30:38 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2017 14:54:21 GMT",
"version": "v2"
}
] | 2017-12-13 | [
[
"Langlois",
"David",
""
],
[
"Liu",
"Hongguang",
""
],
[
"Noui",
"Karim",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | Recently, Chamseddine and Mukhanov introduced a higher-derivative scalar-tensor theory which leads to a modified Friedmann equation allowing for bouncing solutions. As we note in the present work, this Friedmann equation turns out to reproduce exactly the loop quantum cosmology effective dynamics for a flat isotropic a... |
2404.05288 | Alessandro Nagar | Alessandro Nagar, Rossella Gamba, Piero Rettegno, Veronica Fantini,
and Sebastiano Bernuzzi | Effective-one-body waveform model for non-circularized, planar,
coalescing black hole binaries: the importance of radiation reaction | 24 pages, 23 figures, submitted to Phys. Rev. D | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an updated version of the TEOBResumS-Dali effective-one-body (EOB)
waveform model for spin aligned binaries on non-circularized orbits. Recently
computed 4PN (nonspinning) terms are incorporated in the waveform and radiation
reaction. The model is informed by a restricted sample ($\sim60$) of
spin-aligned,... | [
{
"created": "Mon, 8 Apr 2024 08:25:15 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2024 13:51:17 GMT",
"version": "v2"
}
] | 2024-04-17 | [
[
"Nagar",
"Alessandro",
""
],
[
"Gamba",
"Rossella",
""
],
[
"Rettegno",
"Piero",
""
],
[
"Fantini",
"Veronica",
""
],
[
"Bernuzzi",
"Sebastiano",
""
]
] | We present an updated version of the TEOBResumS-Dali effective-one-body (EOB) waveform model for spin aligned binaries on non-circularized orbits. Recently computed 4PN (nonspinning) terms are incorporated in the waveform and radiation reaction. The model is informed by a restricted sample ($\sim60$) of spin-aligned, q... |
1303.5514 | Myungseok Eune | Myungseok Eune, Yongwan Gim, Wontae Kim | Superradiance and statistical entropy of hairy black hole in three
dimensions | 8 pages, no figure, version to appear in PRD | Phys. Rev. D 88 (2013) 047501 | 10.1103/PhysRevD.88.047501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the statistical entropy of a rotating hairy black hole by taking
into account superradiant modes in the brick wall method. The UV cutoff is
independent of the gravitational hair, which gives the well-defined area law of
the entropy. It can be shown that the angular momentum and the energy of matter
field... | [
{
"created": "Fri, 22 Mar 2013 04:30:30 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Aug 2013 13:31:57 GMT",
"version": "v2"
}
] | 2013-08-23 | [
[
"Eune",
"Myungseok",
""
],
[
"Gim",
"Yongwan",
""
],
[
"Kim",
"Wontae",
""
]
] | We calculate the statistical entropy of a rotating hairy black hole by taking into account superradiant modes in the brick wall method. The UV cutoff is independent of the gravitational hair, which gives the well-defined area law of the entropy. It can be shown that the angular momentum and the energy of matter field d... |
1601.03447 | Gerard Hooft 't | Gerard 't Hooft | Black hole unitarity and antipodal entanglement | 15 pages, 1 figure | Found. Phys., 49(9), 1185-1198 (2016) | 10.1007/s10701-016-0014-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking particles emitted by a black hole are usually found to have thermal
spectra, if not exactly, then by a very good approximation. Here, we argue
differently. It was discovered that spherical partial waves of in-going and
out-going matter can be described by unitary evolution operators independently,
which allow... | [
{
"created": "Thu, 14 Jan 2016 00:08:46 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Mar 2016 23:15:54 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Mar 2016 10:45:12 GMT",
"version": "v3"
},
{
"created": "Thu, 14 Apr 2016 11:19:09 GMT",
"version": "v4"
}
] | 2016-12-28 | [
[
"Hooft",
"Gerard 't",
""
]
] | Hawking particles emitted by a black hole are usually found to have thermal spectra, if not exactly, then by a very good approximation. Here, we argue differently. It was discovered that spherical partial waves of in-going and out-going matter can be described by unitary evolution operators independently, which allows ... |
gr-qc/0012079 | Miguel Alcubierre | Miguel Alcubierre, Werner Benger, Bernd Bruegmann, Gerd Lanfermann,
Lars Nerger, Edward Seidel, Ryoji Takahashi | The 3D Grazing Collision of Two Black Holes | 4 pages, 7 figures, revtex | Phys.Rev.Lett.87:271103,2001 | 10.1103/PhysRevLett.87.271103 | null | gr-qc | null | We present results for two colliding black holes (BHs), with angular
momentum, spin, and unequal mass. For the first time gravitational waveforms
are computed for a grazing collision from a full 3D numerical evolution. The
collision can be followed through the merger to form a single BH, and through
part of the ringd... | [
{
"created": "Wed, 20 Dec 2000 11:11:43 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2001 14:07:35 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Benger",
"Werner",
""
],
[
"Bruegmann",
"Bernd",
""
],
[
"Lanfermann",
"Gerd",
""
],
[
"Nerger",
"Lars",
""
],
[
"Seidel",
"Edward",
""
],
[
"Takahashi",
"Ryoji",
""
]
] | We present results for two colliding black holes (BHs), with angular momentum, spin, and unequal mass. For the first time gravitational waveforms are computed for a grazing collision from a full 3D numerical evolution. The collision can be followed through the merger to form a single BH, and through part of the ringdow... |
1808.06011 | Matthew Duez | Matthew D. Duez and Yosef Zlochower | Numerical Relativity of Compact Binaries in the 21st Century | 52 pages, 21 figures, a review of numerical relativity, focusing on
21st century developments up to roughly 2017, Reports on Progress in Physics
2018 | Rep. Prog. Phys. 82 (2019) 016902 | 10.1088/1361-6633/aadb16 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the dramatic progress in the simulations of compact objects and
compact-object binaries that has taken place in the first two decades of the
twenty-first century. This includes simulations of the inspirals and violent
mergers of binaries containing black holes and neutron stars, as well as
simulations of bl... | [
{
"created": "Fri, 17 Aug 2018 22:02:11 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2018 18:40:01 GMT",
"version": "v2"
}
] | 2018-11-08 | [
[
"Duez",
"Matthew D.",
""
],
[
"Zlochower",
"Yosef",
""
]
] | We review the dramatic progress in the simulations of compact objects and compact-object binaries that has taken place in the first two decades of the twenty-first century. This includes simulations of the inspirals and violent mergers of binaries containing black holes and neutron stars, as well as simulations of blac... |
1512.04181 | Aloke Sinha | Aloke Kumar Sinha and Parthasarathi Majumdar | Thermal Stability Of Charged Rotating Quantum Black Holes | null | Modern Physics Letters A , Vol. MPLA, Vol.32, No. 37 (2017)
1750208 | 10.1142/S021773231750208X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Criteria for thermal stability of charged rotating black holes of any
dimension are derived, for horizon areas that are large relative to the Planck
area (in these dimensions). The derivation is based on generic assumptions of
quantum geometry based on some results of loop quantum gravity, and equilibrium
statistical... | [
{
"created": "Mon, 14 Dec 2015 05:48:30 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2016 09:22:42 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Jul 2018 13:57:07 GMT",
"version": "v3"
}
] | 2018-07-30 | [
[
"Sinha",
"Aloke Kumar",
""
],
[
"Majumdar",
"Parthasarathi",
""
]
] | Criteria for thermal stability of charged rotating black holes of any dimension are derived, for horizon areas that are large relative to the Planck area (in these dimensions). The derivation is based on generic assumptions of quantum geometry based on some results of loop quantum gravity, and equilibrium statistical m... |
gr-qc/9606067 | Jose Ademir Sales de Lima | J. A. S. Lima (Brown University, Providence, RI, USA and Universidade
Federal do Rio grande do Norte, Natal, RN, Brazil) and L. R. W. Abramo (Brown
University, Providence, RI, USA) | Deflationary Models Driven by Matter Creation | 17 pages, 2 figures(available from the authors), uses LATEX | Phys.Lett. A257 (1999) 123-131 | 10.1016/S0375-9601(99)00305-9 | Brown-HET-1011 | gr-qc | null | A nonsingular deflationary cosmology driven by adiabatic matter creation is
proposed. In this scenario there is no preinflationary stage as happens in
conventional inflationary models. Deflation starts from a de Sitter spacetime
characterized by an arbitrary time scale $H_{I}^{-1}$, which also pins down an
initial va... | [
{
"created": "Mon, 24 Jun 1996 03:44:20 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lima",
"J. A. S.",
"",
"Brown University, Providence, RI, USA and Universidade\n Federal do Rio grande do Norte, Natal, RN, Brazil"
],
[
"Abramo",
"L. R. W.",
"",
"Brown\n University, Providence, RI, USA"
]
] | A nonsingular deflationary cosmology driven by adiabatic matter creation is proposed. In this scenario there is no preinflationary stage as happens in conventional inflationary models. Deflation starts from a de Sitter spacetime characterized by an arbitrary time scale $H_{I}^{-1}$, which also pins down an initial valu... |
1710.07751 | Leonardo Balart | Leonardo Balart and Sharmanthie Fernando | A Smarr formula for charged black holes in nonlinear electrodynamics | v2: 17 pages, 3 figures, added note, four added references | Mod. Phys. Lett. A, Vol. 32, No. 39 (2017) 1750219 | 10.1142/S0217732317502194 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the Smarr formula does not hold for black holes in
non-linear electrodynamics. The main reason for this is the fact that the trace
of the energy momentum tensor for nonlinear electrodynamics does not vanish as
it is for Maxwell's electrodynamics. Starting from the Komar integral, we
derived a ne... | [
{
"created": "Sat, 21 Oct 2017 05:13:26 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2017 00:09:48 GMT",
"version": "v2"
}
] | 2017-12-22 | [
[
"Balart",
"Leonardo",
""
],
[
"Fernando",
"Sharmanthie",
""
]
] | It is well known that the Smarr formula does not hold for black holes in non-linear electrodynamics. The main reason for this is the fact that the trace of the energy momentum tensor for nonlinear electrodynamics does not vanish as it is for Maxwell's electrodynamics. Starting from the Komar integral, we derived a new ... |
0906.2892 | Jose Luis Hernandez-Pastora | J.L. Hernandez-Pastora | On the existence of MSA coordinates | 40 pages. Submitted to Classical and Quantum Gravity | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The static solutions of the axially symmetric vacuum Einstein equations with
a finite number of Relativistic Multipole Moments are described by means of a
function that can be written in the same analytic form as the Newtonian
gravitational multipole potential. A family of so-called MSA
(Multipole-Symmetry Adapted) c... | [
{
"created": "Tue, 16 Jun 2009 10:33:09 GMT",
"version": "v1"
}
] | 2009-06-17 | [
[
"Hernandez-Pastora",
"J. L.",
""
]
] | The static solutions of the axially symmetric vacuum Einstein equations with a finite number of Relativistic Multipole Moments are described by means of a function that can be written in the same analytic form as the Newtonian gravitational multipole potential. A family of so-called MSA (Multipole-Symmetry Adapted) coo... |
0906.2601 | Antoine Folacci | Yves D\'ecanini and Antoine Folacci | Regge poles of the Schwarzschild black hole: a WKB approach | v2: Minor corrections and consequences in gravitational lensing
briefly discussed. v3: Minor changes to match the published version | Phys.Rev.D81:024031,2010 | 10.1103/PhysRevD.81.024031 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide simple and accurate analytical expressions for the Regge poles of
the Schwarzschild black hole. This is achieved by using third-order WKB
approximations to solve the radial wave equations for spins 0, 1 and 2. These
results permit us to obtain analytically the dispersion relation and the
damping of the "su... | [
{
"created": "Mon, 15 Jun 2009 17:39:57 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Jul 2009 18:52:21 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Jan 2010 10:41:27 GMT",
"version": "v3"
}
] | 2010-03-12 | [
[
"Décanini",
"Yves",
""
],
[
"Folacci",
"Antoine",
""
]
] | We provide simple and accurate analytical expressions for the Regge poles of the Schwarzschild black hole. This is achieved by using third-order WKB approximations to solve the radial wave equations for spins 0, 1 and 2. These results permit us to obtain analytically the dispersion relation and the damping of the "surf... |
gr-qc/0409120 | Mohammad Vahid Takook | S. Rouhani and M.V. Takook | Tree-level Scattering Amplitude in de Sitter Space | 6 pages | Europhys.Lett. 68 (2004) 15 | 10.1209/epl/i2004-10217-3 | null | gr-qc | null | In previous papers [1,2], it was proved that a covariant quantization of the
minimally coupled scalar field in de Sitter space is achieved through addition
of the negative norm states. This causal approach which eliminates the infrared
divergence, was generalized further to the calculation of the graviton
propagator ... | [
{
"created": "Thu, 30 Sep 2004 09:52:58 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Rouhani",
"S.",
""
],
[
"Takook",
"M. V.",
""
]
] | In previous papers [1,2], it was proved that a covariant quantization of the minimally coupled scalar field in de Sitter space is achieved through addition of the negative norm states. This causal approach which eliminates the infrared divergence, was generalized further to the calculation of the graviton propagator in... |
2110.07562 | Griselda Figueroa Aguirre | Ernesto F. Eiroa, Griselda Figueroa-Aguirre | Black hole solutions and thin shells in N-dimensional F(R) gravity with
a conformally invariant Maxwell field | 17 pages, 4 figures; v3: improved version | Eur. Phys. J. Plus (2022) 137:478 | 10.1140/epjp/s13360-022-02676-w | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a generalization of the black hole solution with spherical
symmetry already known in the literature for $N$-dimensional $F(R)$ gravity
with a conformally invariant Maxwell field and constant scalar curvature $R$.
This solution also includes a generalization of the one corresponding to
general relativity as... | [
{
"created": "Thu, 14 Oct 2021 17:28:43 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Nov 2021 11:46:11 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Apr 2022 15:04:19 GMT",
"version": "v3"
}
] | 2022-04-21 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"Figueroa-Aguirre",
"Griselda",
""
]
] | We present a generalization of the black hole solution with spherical symmetry already known in the literature for $N$-dimensional $F(R)$ gravity with a conformally invariant Maxwell field and constant scalar curvature $R$. This solution also includes a generalization of the one corresponding to general relativity as a... |
1807.00483 | Titus K Mathew | Paxy George and Titus K Mathew | Interacting holographic Ricci dark energy as running vacuum | 17 pages, 12 figures | null | 10.1142/S0218271819500603 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Earlier studies have shown that, in a two component model of the universe
with dark matter and the running vacuum energy which is phenomenologically a
combination of $H^2$ and $\dot{H},$ produces either eternal deceleration or
acceleration in the absence of a bare constant in the density of the running
vacuum. In thi... | [
{
"created": "Mon, 2 Jul 2018 06:32:01 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2018 06:34:49 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Aug 2018 11:15:02 GMT",
"version": "v3"
}
] | 2019-03-27 | [
[
"George",
"Paxy",
""
],
[
"Mathew",
"Titus K",
""
]
] | Earlier studies have shown that, in a two component model of the universe with dark matter and the running vacuum energy which is phenomenologically a combination of $H^2$ and $\dot{H},$ produces either eternal deceleration or acceleration in the absence of a bare constant in the density of the running vacuum. In this ... |
1710.07281 | Gopi Kant Goswami Dr | G. K. Goswami | Cosmological Parameters For Spatially Flat Dust Filled Universe In
Brans-Dicke Theory | 13 pages, 8 figures | Research in Astronomy and Astrophysics (RAA), 2017, Vol. 17, No.
3, 27 (12pp) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have investigated late time acceleration for a spatially
flat dust filled Universe in Brans-Dicke theory in the presence of a positive
cosmological constant $\Lambda$ . Expressions for Hubble's constant, luminosity
distance and apparent magnitude have been obtained for our model. The
theoretical res... | [
{
"created": "Thu, 19 Oct 2017 13:39:39 GMT",
"version": "v1"
}
] | 2017-10-23 | [
[
"Goswami",
"G. K.",
""
]
] | In this paper, we have investigated late time acceleration for a spatially flat dust filled Universe in Brans-Dicke theory in the presence of a positive cosmological constant $\Lambda$ . Expressions for Hubble's constant, luminosity distance and apparent magnitude have been obtained for our model. The theoretical resul... |
1508.02665 | Ivan Jardim | I.C. Jardim, R.R. Landim | About the cosmological constant in geometric scalar theory of gravity | 9 pages, 4 figures. minor corrections in sec. III | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study how to include the cosmological constant in geometric
scalar theory of gravity (GSG). Firstly we show that the cosmological constant
could not be modeled by a matter field, unlike in General Relativity. We also
show that a spherically symmetric matter distribution, over the de Sitter
vacuum, do... | [
{
"created": "Tue, 11 Aug 2015 17:37:53 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2015 17:37:39 GMT",
"version": "v2"
}
] | 2015-09-11 | [
[
"Jardim",
"I. C.",
""
],
[
"Landim",
"R. R.",
""
]
] | In this paper we study how to include the cosmological constant in geometric scalar theory of gravity (GSG). Firstly we show that the cosmological constant could not be modeled by a matter field, unlike in General Relativity. We also show that a spherically symmetric matter distribution, over the de Sitter vacuum, does... |
2107.05046 | Michele Maggiore | Andreas Finke, Stefano Foffa, Francesco Iacovelli, Michele Maggiore
and Michele Mancarella | Probing modified gravitational wave propagation with strongly lensed
coalescing binaries | 11 pages, 5 figures | null | 10.1103/PhysRevD.104.084057 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently shown that quadruply lensed gravitational-wave (GW)
events due to coalescing binaries can be localized to one or just a few
galaxies, even in the absence of an electromagnetic counterpart. We discuss how
this can be used to extract information on modified GW propagation, which is a
crucial signat... | [
{
"created": "Sun, 11 Jul 2021 13:39:05 GMT",
"version": "v1"
}
] | 2021-10-27 | [
[
"Finke",
"Andreas",
""
],
[
"Foffa",
"Stefano",
""
],
[
"Iacovelli",
"Francesco",
""
],
[
"Maggiore",
"Michele",
""
],
[
"Mancarella",
"Michele",
""
]
] | It has been recently shown that quadruply lensed gravitational-wave (GW) events due to coalescing binaries can be localized to one or just a few galaxies, even in the absence of an electromagnetic counterpart. We discuss how this can be used to extract information on modified GW propagation, which is a crucial signatur... |
gr-qc/0610030 | Fu-Wen Shu | Fu-Wen Shu, You-Gen Shen | Geometric Flows and Black Holes | 3 pages | null | null | null | gr-qc | null | Motivated by the newest progress in geometric flows both in mathematics and
physics, we apply the geometric evolution equation to study some black-hole
problems. Our results show that, under certain conditions, the geometric
evolution equations satisfy the Birkhoff theorem, and surprisingly, in the case
of sphericall... | [
{
"created": "Sun, 8 Oct 2006 12:04:09 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Apr 2007 07:27:35 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Shu",
"Fu-Wen",
""
],
[
"Shen",
"You-Gen",
""
]
] | Motivated by the newest progress in geometric flows both in mathematics and physics, we apply the geometric evolution equation to study some black-hole problems. Our results show that, under certain conditions, the geometric evolution equations satisfy the Birkhoff theorem, and surprisingly, in the case of spherically ... |
1410.7599 | Ugur Camci | U. Camci | Approximate Noether gauge symmetries of Bardeen model | 7 pages, 1 table, submitted to the EPJC | null | 10.1140/epjc/s10052-014-3201-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the approximate Noether gauge symmetries of the geodesic
Lagrangian for the Bardeen spacetime model. This is accommodated by a set of
new approximate Noether gauge symmetry relations for the perturbed geodesic
Lagrangian in the spacetime. A detailed analysis to the spacetime of Bardeen
model up to thir... | [
{
"created": "Tue, 28 Oct 2014 12:18:40 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Camci",
"U.",
""
]
] | We investigate the approximate Noether gauge symmetries of the geodesic Lagrangian for the Bardeen spacetime model. This is accommodated by a set of new approximate Noether gauge symmetry relations for the perturbed geodesic Lagrangian in the spacetime. A detailed analysis to the spacetime of Bardeen model up to third-... |
1711.03389 | Vasilis Oikonomou | V.K. Oikonomou | Autonomous Dynamical System Approach for Inflationary Gauss-Bonnet
Modified Gravity | null | null | 10.1142/S0218271818500591 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we shall analyze the $f(\mathcal{G})$ gravity phase space, in
the case that the corresponding dynamical system is autonomous. In order to
make the dynamical system autonomous, we shall appropriately choose the
independent variables, and we shall analyze the evolution of the variables
numerically, emphas... | [
{
"created": "Thu, 9 Nov 2017 14:37:24 GMT",
"version": "v1"
}
] | 2018-04-25 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this paper we shall analyze the $f(\mathcal{G})$ gravity phase space, in the case that the corresponding dynamical system is autonomous. In order to make the dynamical system autonomous, we shall appropriately choose the independent variables, and we shall analyze the evolution of the variables numerically, emphasiz... |
2011.14952 | Griselda Figueroa Aguirre | Ernesto F. Eiroa, Griselda Figueroa-Aguirre | Thin shells in (2+1)-dimensional F(R) gravity | 14 pages, 4 figures; v2: minor changes, new references added | Phys. Rev. D 103, 044011 (2021) | 10.1103/PhysRevD.103.044011 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study thin shells of matter in (2+1)-dimensional F(R) theories of gravity
with constant scalar curvature R. We consider a wide class of spacetimes with
circular symmetry, in which a thin shell joins an inner region with an outer
one. We analyze the stability of the static configurations under radial
perturbations.... | [
{
"created": "Mon, 30 Nov 2020 16:26:06 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2021 11:59:00 GMT",
"version": "v2"
}
] | 2021-02-10 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"Figueroa-Aguirre",
"Griselda",
""
]
] | We study thin shells of matter in (2+1)-dimensional F(R) theories of gravity with constant scalar curvature R. We consider a wide class of spacetimes with circular symmetry, in which a thin shell joins an inner region with an outer one. We analyze the stability of the static configurations under radial perturbations. A... |
2003.11369 | Christian Corda Prof. | \"Ozg\"ur \"Okc\"u, Christian Corda, Ekrem Aydiner | Modified Friedmann equations from DSR-GUP | 12 pages, final version matching the one accepted for publication in
Europhysics Letters. The Authors dedicate this paper to people who died due
to Covid-19 and those who fight it | EPL, 129 (2020) 50002 | 10.1209/0295-5075/129/50002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the modified entropy-area relation from DSR-GUP (Doubly special
relativity-Generalized uncertainity principle), we obtain the modified
Friedmann equations from the first law of thermodynamics at apparent horizon.
Due to the importance of GUP at Planck scale, we investigate the Friedmann
equations and show... | [
{
"created": "Sun, 22 Mar 2020 17:23:38 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2020 15:03:52 GMT",
"version": "v2"
}
] | 2020-04-01 | [
[
"Ökcü",
"Özgür",
""
],
[
"Corda",
"Christian",
""
],
[
"Aydiner",
"Ekrem",
""
]
] | Considering the modified entropy-area relation from DSR-GUP (Doubly special relativity-Generalized uncertainity principle), we obtain the modified Friedmann equations from the first law of thermodynamics at apparent horizon. Due to the importance of GUP at Planck scale, we investigate the Friedmann equations and show t... |
2106.10218 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Charged wormholes in spacetimes of embedding class one | 6 pages, no figures | Letters in High Energy Physics (LHEP), vol. 2021, ID: 207 (2021) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of charged black holes has suggested that wormholes may also be
charged. The purpose of this paper is to construct a general model of a charged
wormhole that proves to be a natural extension of the original Morris-Thorne
wormhole. This goal is achieved by means of the classical embedding theory that
has... | [
{
"created": "Fri, 18 Jun 2021 16:43:35 GMT",
"version": "v1"
}
] | 2021-06-21 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | The existence of charged black holes has suggested that wormholes may also be charged. The purpose of this paper is to construct a general model of a charged wormhole that proves to be a natural extension of the original Morris-Thorne wormhole. This goal is achieved by means of the classical embedding theory that has p... |
gr-qc/9907021 | null | A. A. Logunov, M. A. Mestvirishvili | What happens in the vicinity of the Schwarzschild sphere when nonzero
graviton rest mass is present | 26 pages, latex file | null | null | IHEP 99-19 | gr-qc | null | In this paper a solution for a static spherically symmetric body is
thoroughly considered in the framework of the Relativistic Theory of
Gravitation. By the comparison of this solution with the Schwarzschild solution
in General Relativity their substantial difference is established in the region
close to the Schwarzs... | [
{
"created": "Tue, 6 Jul 1999 11:50:46 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jul 1999 10:16:34 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Logunov",
"A. A.",
""
],
[
"Mestvirishvili",
"M. A.",
""
]
] | In this paper a solution for a static spherically symmetric body is thoroughly considered in the framework of the Relativistic Theory of Gravitation. By the comparison of this solution with the Schwarzschild solution in General Relativity their substantial difference is established in the region close to the Schwarzsch... |
1012.5277 | Roldao da Rocha | A. C. Amaro de Faria, Roldao da Rocha, M. E. S. Alves and J. C. N. de
Araujo | Gravitational Waves in Braneworld Scenarios with AdS Background | 5 pages, RevTeX, a paragraph added | Mod. Phys. Lett. A 27, 1250022 (2012) | 10.1142/S0217732312500228 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate gravitational waves as metric perturbations
around a general warped 5-dimensional background. We find an analytical
solution in Randall-Sundrum braneworld model and analyze the implications of
braneworld models in the gravitational waves propagation.
| [
{
"created": "Thu, 23 Dec 2010 19:19:19 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2011 20:29:58 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Feb 2012 17:56:15 GMT",
"version": "v3"
}
] | 2012-02-14 | [
[
"de Faria",
"A. C. Amaro",
""
],
[
"da Rocha",
"Roldao",
""
],
[
"Alves",
"M. E. S.",
""
],
[
"de Araujo",
"J. C. N.",
""
]
] | In this paper, we investigate gravitational waves as metric perturbations around a general warped 5-dimensional background. We find an analytical solution in Randall-Sundrum braneworld model and analyze the implications of braneworld models in the gravitational waves propagation. |
1609.03288 | Rituparno Goswami | Sayuri Singh, George F. R. Ellis, Rituparno Goswami and Sunil D.
Maharaj | New class of LRS spacetimes with simultaneous rotation and spatial twist | 7 pages, Revtex 4 | Phys. Rev. D 94, 104040 (2016) | 10.1103/PhysRevD.94.104040 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the existence and find the necessary and sufficient conditions
for a new class of solutions of Locally Rotationally Symmetric spacetimes that
have non vanishing rotation and spatial twist simultaneously. We transparently
show that the existence of such solutions demand non vanishing and bounded heat
flux... | [
{
"created": "Mon, 12 Sep 2016 07:33:30 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Singh",
"Sayuri",
""
],
[
"Ellis",
"George F. R.",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | We establish the existence and find the necessary and sufficient conditions for a new class of solutions of Locally Rotationally Symmetric spacetimes that have non vanishing rotation and spatial twist simultaneously. We transparently show that the existence of such solutions demand non vanishing and bounded heat flux a... |
2306.11741 | Claudio Cremaschini | Claudio Cremaschini and Zden\v{e}k Stuchl\'ik | Magnification effect of Kerr metric by configurations of collisionless
particles in non-isotropic kinetic equilibria | 13 pages. arXiv admin note: text overlap with arXiv:2306.10434 | The European Physical Journal Plus 133, 203 (2018) | 10.1140/epjp/i2018-12043-9 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A test fluid composed of relativistic collisionless neutral particles in the
background of Kerr metric is expected to generate non-isotropic equilibrium
configurations in which the corresponding stress-energy tensor exhibits
pressure and temperature anisotropies. This arises as a consequence of the
constraints placed... | [
{
"created": "Sat, 17 Jun 2023 22:38:09 GMT",
"version": "v1"
}
] | 2023-06-22 | [
[
"Cremaschini",
"Claudio",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | A test fluid composed of relativistic collisionless neutral particles in the background of Kerr metric is expected to generate non-isotropic equilibrium configurations in which the corresponding stress-energy tensor exhibits pressure and temperature anisotropies. This arises as a consequence of the constraints placed o... |
1903.12481 | Ritabrata Biswas | Amritendu Halder and Ritabrata Biswas | Thermodynamic studies of Different Type of Black Holes: General
Uncertainty Principle Approach | 15 pages, 25 figures | Modern Physics Letters A Vol. 33, No. 34, 1850200 (2018) | 10.1142/S0217732318502000 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an investigation on thermodynamics of two different types of black
holes viz. Kiselev black hole (asymptotically flat) and Taub-NUT
(non-asymptotically flat) black hole. We compute the thermodynamic variables
like black hole's Hawking temperature, entropy at the black hole's event
horizon. Further we deriv... | [
{
"created": "Thu, 28 Mar 2019 09:14:07 GMT",
"version": "v1"
}
] | 2019-04-01 | [
[
"Halder",
"Amritendu",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | We present an investigation on thermodynamics of two different types of black holes viz. Kiselev black hole (asymptotically flat) and Taub-NUT (non-asymptotically flat) black hole. We compute the thermodynamic variables like black hole's Hawking temperature, entropy at the black hole's event horizon. Further we derive ... |
1604.00531 | Sunil Maurya DR. | Piyali Bhar, S.K. Maurya, Y. K. Gupta, Tuhina Manna | Modelling of anisotropic compact stars of emebedding class one | 16 pages, 15 figures and 2 tables, Eur. Phys. J. A (2016) 52: 312 | null | 10.1140/epja/i2016-16312-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present article, we have constructed static anisotropic compact star
models of Einstein field equations for the spherical symmetric metric of
embedding class one. By assuming the particular form of metric function $\nu$,
We have solved the Einstein field equations for anisotropic matter
distribution. The aniso... | [
{
"created": "Sat, 2 Apr 2016 17:20:45 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2016 08:16:19 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Oct 2016 07:00:01 GMT",
"version": "v3"
}
] | 2016-11-23 | [
[
"Bhar",
"Piyali",
""
],
[
"Maurya",
"S. K.",
""
],
[
"Gupta",
"Y. K.",
""
],
[
"Manna",
"Tuhina",
""
]
] | In the present article, we have constructed static anisotropic compact star models of Einstein field equations for the spherical symmetric metric of embedding class one. By assuming the particular form of metric function $\nu$, We have solved the Einstein field equations for anisotropic matter distribution. The anisotr... |
2301.01603 | Behnam Pourhassan | B. Pourhassan, M. Dehghani, S. Upadhyay, I. Sakalli, D. V. Singh | Exponential corrected thermodynamics of Born-Infeld BTZ black holes in
massive gravity | 16 pages, 4 figures | Mod. Phys. Lett. A 37, 2250230 (2022) | 10.1142/S0217732322502303 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that entropy of black hole gets correction at quantum level.
Universally, these corrections are logarithmic and exponential in nature. We
analyze the impacts of these quantum corrections on thermodynamics of
Born-Infeld BTZ black hole in massive gravity by considering both such kinds of
correction. We do ... | [
{
"created": "Sun, 25 Dec 2022 08:38:11 GMT",
"version": "v1"
}
] | 2023-05-26 | [
[
"Pourhassan",
"B.",
""
],
[
"Dehghani",
"M.",
""
],
[
"Upadhyay",
"S.",
""
],
[
"Sakalli",
"I.",
""
],
[
"Singh",
"D. V.",
""
]
] | It is known that entropy of black hole gets correction at quantum level. Universally, these corrections are logarithmic and exponential in nature. We analyze the impacts of these quantum corrections on thermodynamics of Born-Infeld BTZ black hole in massive gravity by considering both such kinds of correction. We do co... |
1612.02030 | Letizia Sammut | The LIGO Scientific Collaboration and the Virgo Collaboration: B. P.
Abbott, R. Abbott, T. D. Abbott, M. R. Abernathy, F. Acernese, K. Ackley, C.
Adams, T. Adams, P. Addesso, R. X. Adhikari, V. B. Adya, C. Affeldt, M.
Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith,
B. Allen, A. All... | Directional limits on persistent gravitational waves from Advanced
LIGO's first observing run | 14 pages, 4 figures | Phys. Rev. Lett. 118, 121102 (2017) | 10.1103/PhysRevLett.118.121102 | null | gr-qc astro-ph.CO astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ gravitational-wave radiometry to map the gravitational waves
stochastic background expected from a variety of contributing mechanisms and
test the assumption of isotropy using data from Advanced LIGO's first observing
run. We also search for persistent gravitational waves from point sources with
only minima... | [
{
"created": "Tue, 6 Dec 2016 21:20:09 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2016 00:55:15 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2016 09:51:51 GMT",
"version": "v3"
},
{
"created": "Mon, 30 Jan 2017 22:15:52 GMT",
"version": "v4"
}
] | 2017-03-29 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Abernathy",
"M. R.",
""
],
[
"Acernese",
"F... | We employ gravitational-wave radiometry to map the gravitational waves stochastic background expected from a variety of contributing mechanisms and test the assumption of isotropy using data from Advanced LIGO's first observing run. We also search for persistent gravitational waves from point sources with only minimal ... |
1812.03578 | Carlo Rovelli | Carlo Rovelli | Where was past low-entropy? | The revision contains a new section detailing the entropy evolution
and answering a question posed by a cosmologist: how can the system go out of
equilibrium is the entropy remains constant? 9 pages, 3 figures | null | 10.3390/e21050466 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I identify where precisely is low-entropy located in the early universe,
arguing that some common answers overplay the role of gravity. I discuss the
available interpretations of the "improbability" of this early low-entropy.
| [
{
"created": "Sun, 9 Dec 2018 23:48:58 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2019 20:29:54 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Rovelli",
"Carlo",
""
]
] | I identify where precisely is low-entropy located in the early universe, arguing that some common answers overplay the role of gravity. I discuss the available interpretations of the "improbability" of this early low-entropy. |
1911.10224 | Samantha L\'opez | S. L\'opez P\'erez, D. Manreza Paret, G. Quintero Angulo, A. P\'erez
Mart\'inez, D. Alvear Terrero | Modeling anisotropic magnetized strange quark stars | 5 pages, 5 figures, Proceedings of STARS-SMFNS 2019 | null | 10.1002/asna.201913721 | null | gr-qc nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact objects have an intrinsic anisotropy due to the presence of strong
magnetic fields that cause considerable modifications on the equations of state
(EoS). In this work, we study the impact of this anisotropy in the size and
shape of magnetized strange quark stars using an axially symmetric metric in
spherical ... | [
{
"created": "Fri, 22 Nov 2019 19:27:18 GMT",
"version": "v1"
}
] | 2020-02-05 | [
[
"Pérez",
"S. López",
""
],
[
"Paret",
"D. Manreza",
""
],
[
"Angulo",
"G. Quintero",
""
],
[
"Martínez",
"A. Pérez",
""
],
[
"Terrero",
"D. Alvear",
""
]
] | Compact objects have an intrinsic anisotropy due to the presence of strong magnetic fields that cause considerable modifications on the equations of state (EoS). In this work, we study the impact of this anisotropy in the size and shape of magnetized strange quark stars using an axially symmetric metric in spherical co... |
2204.00897 | Xiao-Mei Kuang | Yuan Meng, Xiao-Mei Kuang, Zi-Yu Tang | Photon regions, shadow observables and constraints from M87* of a
charged rotating black hole | references added | PHYS. REV. D 106, 064006 (2022) | 10.1103/PhysRevD.106.064006 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Inspired by the observations of supermassive black hole M87* in \emph{Event
Horizon Telescope }(EHT) experiment, a remarkable surge in black hole physics
is to use the black hole shadow's observables to distinguish general relativity
(GR) and modified theories of gravity (MoG), which could also help to disclose
the a... | [
{
"created": "Sat, 2 Apr 2022 16:34:38 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 17:06:19 GMT",
"version": "v2"
}
] | 2022-09-20 | [
[
"Meng",
"Yuan",
""
],
[
"Kuang",
"Xiao-Mei",
""
],
[
"Tang",
"Zi-Yu",
""
]
] | Inspired by the observations of supermassive black hole M87* in \emph{Event Horizon Telescope }(EHT) experiment, a remarkable surge in black hole physics is to use the black hole shadow's observables to distinguish general relativity (GR) and modified theories of gravity (MoG), which could also help to disclose the ast... |
gr-qc/0304022 | Andrea Vicere' | A. Vicere', G. Calamai, E. Campagna, G. Conforto, E. Cuoco, P.
Dominici, I. Fiori, G. M. Guidi, G. Losurdo, F. Martelli, M. Mazzoni, B.
Perniola, R.Stanga and F. Vetrano | Testing the performance of a blind burst statistic | 8 pages, 6 figures, Talk given at the GWDAW2002 workshop | Class.Quant.Grav. 20 (2003) S821- | 10.1088/0264-9381/20/17/325 | null | gr-qc | null | In this work we estimate the performance of a method for the detection of
burst events in the data produced by interferometric gravitational wave
detectors. We compute the receiver operating characteristics in the specific
case of a simulated noise having the spectral density expected for Virgo, using
test signals ta... | [
{
"created": "Fri, 4 Apr 2003 12:42:19 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Vicere'",
"A.",
""
],
[
"Calamai",
"G.",
""
],
[
"Campagna",
"E.",
""
],
[
"Conforto",
"G.",
""
],
[
"Cuoco",
"E.",
""
],
[
"Dominici",
"P.",
""
],
[
"Fiori",
"I.",
""
],
[
"Guidi",
"G. M.",
... | In this work we estimate the performance of a method for the detection of burst events in the data produced by interferometric gravitational wave detectors. We compute the receiver operating characteristics in the specific case of a simulated noise having the spectral density expected for Virgo, using test signals take... |
2110.10137 | Pengyu Le | Pengyu Le | Note on strong cosmic censorship for spherically symmetric Einstein-dust
model | 11 pages | null | null | null | gr-qc math-ph math.DG math.MP | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this note, we derive an ordinary differential equation for outgoing light
rays in the spacetime of a spherically symmetric contracting dust cloud. The
violation of strong cosmic censorship is equivalent to the existence of a
solution blowing up at the centre of the symmetry. As an application, we
reprove the gener... | [
{
"created": "Tue, 19 Oct 2021 17:46:29 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Le",
"Pengyu",
""
]
] | In this note, we derive an ordinary differential equation for outgoing light rays in the spacetime of a spherically symmetric contracting dust cloud. The violation of strong cosmic censorship is equivalent to the existence of a solution blowing up at the centre of the symmetry. As an application, we reprove the generic... |
1807.05236 | Parampreet Singh | Bao-Fei Li, Parampreet Singh, Anzhong Wang | Qualitative dynamics and inflationary attractors in loop cosmology | 29 pages, 18 figures. Minor changes. To appear in Phys. Rev. D | Phys. Rev. D 98, 066016 (2018) | 10.1103/PhysRevD.98.066016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Qualitative dynamics of three different loop quantizations of spatially flat
isotropic and homogeneous models is studied using effective spacetime
description of the underlying quantum geometry. These include the standard loop
quantum cosmology (LQC), its recently revived modification (referred to as
mLQC-I), and ano... | [
{
"created": "Fri, 13 Jul 2018 18:01:16 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2018 18:05:14 GMT",
"version": "v2"
}
] | 2018-10-03 | [
[
"Li",
"Bao-Fei",
""
],
[
"Singh",
"Parampreet",
""
],
[
"Wang",
"Anzhong",
""
]
] | Qualitative dynamics of three different loop quantizations of spatially flat isotropic and homogeneous models is studied using effective spacetime description of the underlying quantum geometry. These include the standard loop quantum cosmology (LQC), its recently revived modification (referred to as mLQC-I), and anoth... |
1808.05045 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Viable Inflation in Scalar-Gauss-Bonnet Gravity and Reconstruction from
Observational Indices | PRD Accepted | null | 10.1103/PhysRevD.98.044039 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper the focus is on inflationary dynamics in the context of
Einstein Gauss-Bonnet gravitational theories. We investigate the implications
of the slow-roll condition on the slow-roll indices and we investigate how the
inflationary dynamical evolution is affected by the presence of the
Gauss-Bonnet coupling t... | [
{
"created": "Wed, 15 Aug 2018 11:51:38 GMT",
"version": "v1"
}
] | 2018-09-26 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this paper the focus is on inflationary dynamics in the context of Einstein Gauss-Bonnet gravitational theories. We investigate the implications of the slow-roll condition on the slow-roll indices and we investigate how the inflationary dynamical evolution is affected by the presence of the Gauss-Bonnet coupling to ... |
0901.1153 | Hideki Maeda | Hideki Maeda, Tomohiro Harada, and B.J. Carr | Cosmological wormholes | 10 pages, 3 figures, published version in Physical Review D | Phys.Rev.D79:044034,2009 | 10.1103/PhysRevD.79.044034 | CECS-PHY-08/22 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the cosmological wormhole solutions obtained from our recent
numerical investigations, we provide a definition of a wormhole which applies
to dynamical situations. Our numerical solutions do not have timelike trapping
horizons but they are wormholes in the sense that they connect two or more
asymptotic r... | [
{
"created": "Thu, 8 Jan 2009 23:43:09 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Jan 2009 02:28:11 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Mar 2009 20:27:57 GMT",
"version": "v3"
}
] | 2009-03-12 | [
[
"Maeda",
"Hideki",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Carr",
"B. J.",
""
]
] | Motivated by the cosmological wormhole solutions obtained from our recent numerical investigations, we provide a definition of a wormhole which applies to dynamical situations. Our numerical solutions do not have timelike trapping horizons but they are wormholes in the sense that they connect two or more asymptotic reg... |
1807.01655 | Christopher Gallagher | Christopher S. Gallagher, Timothy Clifton | Relativistic Euler Equations in cosmologies with non-linear structures | 13 pages, 1 appendix | Phys. Rev. D 98, 103516 (2018) | 10.1103/PhysRevD.98.103516 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a new variant of cosmological perturbation theory that has been
designed specifically to include non-linear density contrasts on scales 100
Mpc, while still allowing for linear fluctuations on larger scales. This theory
is used to derive the relativistic equations of Eulerian hydrodynamics in
realistic co... | [
{
"created": "Wed, 4 Jul 2018 16:12:22 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2019 14:35:55 GMT",
"version": "v2"
}
] | 2019-04-08 | [
[
"Gallagher",
"Christopher S.",
""
],
[
"Clifton",
"Timothy",
""
]
] | We consider a new variant of cosmological perturbation theory that has been designed specifically to include non-linear density contrasts on scales 100 Mpc, while still allowing for linear fluctuations on larger scales. This theory is used to derive the relativistic equations of Eulerian hydrodynamics in realistic cosm... |
2110.10008 | Rodrigo Bufalo | D. Jackson and R. Bufalo | Non-local gravity in bouncing cosmology scenarios | v1: 14 pages, 5 figures; v2: 15 pages, 6 figures, matches JCAP
published version | JCAP 05 (2022) 043 | 10.1088/1475-7516/2022/05/043 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we analyzed the improved Deser-Woodard non-local gravity over
the background of five different bouncing cosmologies, whose premise is avoid
the initial singular state of the universe. We developed the numerical solution
for the non-local distortion function, which encompass the modifications to the
Eins... | [
{
"created": "Tue, 19 Oct 2021 14:21:35 GMT",
"version": "v1"
},
{
"created": "Mon, 30 May 2022 14:30:38 GMT",
"version": "v2"
}
] | 2022-06-01 | [
[
"Jackson",
"D.",
""
],
[
"Bufalo",
"R.",
""
]
] | In this work, we analyzed the improved Deser-Woodard non-local gravity over the background of five different bouncing cosmologies, whose premise is avoid the initial singular state of the universe. We developed the numerical solution for the non-local distortion function, which encompass the modifications to the Einste... |
1607.02254 | Jong Hyuk Yoon | Seung Hun Oh, Kyoungtae Kimm, Yongmin Cho, and Jong Hyuk Yoon | Solution-generating methods of Einstein's equations by Hamiltonian
reduction | 7 pages, no figures | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to demonstrate a new method of generating exact
solutions to the Einstein's equations obtained by the Hamiltonian reduction.
The key element to the successful Hamiltonian reduction is finding the
privileged spacetime coordinates in which physical degrees of freedom
manifestly reside in th... | [
{
"created": "Fri, 8 Jul 2016 06:51:23 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2016 13:15:30 GMT",
"version": "v2"
}
] | 2016-12-19 | [
[
"Oh",
"Seung Hun",
""
],
[
"Kimm",
"Kyoungtae",
""
],
[
"Cho",
"Yongmin",
""
],
[
"Yoon",
"Jong Hyuk",
""
]
] | The purpose of this paper is to demonstrate a new method of generating exact solutions to the Einstein's equations obtained by the Hamiltonian reduction. The key element to the successful Hamiltonian reduction is finding the privileged spacetime coordinates in which physical degrees of freedom manifestly reside in the ... |
1204.5455 | Olivier Piguet | Rodrigo M. S. Barbosa, Clisthenis P Constantinidis, Zui Oporto and
Olivier Piguet | Quantization of Lorentzian 3d Gravity by Partial Gauge Fixing | Notation defect fixed on pages 5 (bottom) and 6 (around Eqs. 3.1)--
19 pages, Latex | null | 10.1088/0264-9381/29/15/155011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | D = 2+1 gravity with a cosmological constant has been shown by Bonzom and
Livine to present a Barbero-Immirzi like ambiguity depending on a parameter. We
make use of this fact to show that, for positive cosmological constant, the
Lorentzian theory can be partially gauge fixed and reduced to an SU(2)
Chern-Simons theo... | [
{
"created": "Tue, 24 Apr 2012 18:26:54 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Apr 2012 17:16:41 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Barbosa",
"Rodrigo M. S.",
""
],
[
"Constantinidis",
"Clisthenis P",
""
],
[
"Oporto",
"Zui",
""
],
[
"Piguet",
"Olivier",
""
]
] | D = 2+1 gravity with a cosmological constant has been shown by Bonzom and Livine to present a Barbero-Immirzi like ambiguity depending on a parameter. We make use of this fact to show that, for positive cosmological constant, the Lorentzian theory can be partially gauge fixed and reduced to an SU(2) Chern-Simons theory... |
2208.11042 | Ashmita Rai | Ashmita, Payel Sarkar, Prasanta Kumar Das | Inflationary Cosmology in the Modified $f(R, T)$ Gravity | 10 pages, 1 figure | null | 10.1142/S0218271822501206 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the inflationary cosmology in modified gravity theory
$f(R, T) = R + 2 \lambda T$ ($\lambda$ is the modified gravity parameter) with
three distinct class of inflation potentials (i) $\phi^p e^{-\alpha\phi}$, (ii)
$(1-\phi^p)e^{-\alpha\phi}$ and (iii) $\frac{\alpha\phi^2}{1+\alpha\phi^2}$
where ... | [
{
"created": "Tue, 23 Aug 2022 15:39:49 GMT",
"version": "v1"
}
] | 2023-01-09 | [
[
"Ashmita",
"",
""
],
[
"Sarkar",
"Payel",
""
],
[
"Das",
"Prasanta Kumar",
""
]
] | In this work, we study the inflationary cosmology in modified gravity theory $f(R, T) = R + 2 \lambda T$ ($\lambda$ is the modified gravity parameter) with three distinct class of inflation potentials (i) $\phi^p e^{-\alpha\phi}$, (ii) $(1-\phi^p)e^{-\alpha\phi}$ and (iii) $\frac{\alpha\phi^2}{1+\alpha\phi^2}$ where $\... |
2406.05126 | Boris Daszuta | Boris Daszuta, and William Cook | GR-Athena++: magnetohydrodynamical evolution with dynamical space-time | Invited chapter for the edited book {\it New Frontiers in GRMHD
Simulations} (Eds. C. Bambi, Y. Mizuno, S. Shashank and F. Yuan, Springer
Singapore, expected in 2024) | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We present a self-contained overview of GR-Athena++, a general-relativistic
magnetohydrodynamics (GRMHD) code, that incorporates treatment of dynamical
space-time, based on the recent work of (Daszuta+, 2021)[49] and (Cook+,
2023)[45].
General aspects of the Athena++ framework we build upon, such as oct-tree
based,... | [
{
"created": "Fri, 7 Jun 2024 17:55:11 GMT",
"version": "v1"
}
] | 2024-06-10 | [
[
"Daszuta",
"Boris",
""
],
[
"Cook",
"William",
""
]
] | We present a self-contained overview of GR-Athena++, a general-relativistic magnetohydrodynamics (GRMHD) code, that incorporates treatment of dynamical space-time, based on the recent work of (Daszuta+, 2021)[49] and (Cook+, 2023)[45]. General aspects of the Athena++ framework we build upon, such as oct-tree based, ada... |
1401.0568 | Matt Visser | Petarpa Boonserm (Chulalongkorn University), Tritos Ngampitipan
(Chulalongkorn University), and Matt Visser (Victoria University of
Wellington) | Bounding the greybody factors for scalar excitations of the Kerr-Newman
spacetime | 22 pages | JHEP 1403 (2014) 113 | 10.1007/JHEP03(2014)113 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Finding exact solutions for black-hole greybody factors is generically
impractical; typically one resorts either to making semi-analytic or numerical
estimates, or alternatively to deriving rigorous analytic bounds. Indeed,
rigorous bounds have already been established for the greybody factors of
Schwarzschild and Ri... | [
{
"created": "Fri, 3 Jan 2014 00:49:35 GMT",
"version": "v1"
}
] | 2014-05-23 | [
[
"Boonserm",
"Petarpa",
"",
"Chulalongkorn University"
],
[
"Ngampitipan",
"Tritos",
"",
"Chulalongkorn University"
],
[
"Visser",
"Matt",
"",
"Victoria University of\n Wellington"
]
] | Finding exact solutions for black-hole greybody factors is generically impractical; typically one resorts either to making semi-analytic or numerical estimates, or alternatively to deriving rigorous analytic bounds. Indeed, rigorous bounds have already been established for the greybody factors of Schwarzschild and Ries... |
gr-qc/9304044 | Ranjeet S. Tate | Abhay Ashtekar and Jerzy Lewandowski | Completeness of Wilson loop functionals on the moduli space of $SL(2,C)$
and $SU(1,1)$-connections | Plain TeX, 7 pages, SU-GP-93/4-? | Class.Quant.Grav.10:L69-L74,1993 | 10.1088/0264-9381/10/6/002 | null | gr-qc | null | The structure of the moduli spaces $\M := \A/\G$ of (all, not just flat)
$SL(2,C)$ and $SU(1,1)$ connections on a n-manifold is analysed. For any
topology on the corresponding spaces $\A$ of all connections which satisfies
the weak requirement of compatibility with the affine structure of $\A$, the
moduli space $\M$ ... | [
{
"created": "Fri, 30 Apr 1993 00:44:35 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | The structure of the moduli spaces $\M := \A/\G$ of (all, not just flat) $SL(2,C)$ and $SU(1,1)$ connections on a n-manifold is analysed. For any topology on the corresponding spaces $\A$ of all connections which satisfies the weak requirement of compatibility with the affine structure of $\A$, the moduli space $\M$ is... |
1606.08056 | Aaron Zimmerman | Aaron Zimmerman, Adam G. M. Lewis, and Harald P. Pfeiffer | Redshift factor and the first law of binary black hole mechanics in
numerical simulations | 7 pages, 4 figures. Updated to reflect published version | Phys. Rev. Lett. 117, 191101 (2016) | 10.1103/PhysRevLett.117.191101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The redshift factor $z$ is an invariant quantity of fundamental interest in
post-Newtonian and self-force descriptions of compact binaries. It connects
different approximation schemes, and plays a central role in the first law of
binary black hole mechanics, which links local quantities to asymptotic
measures of ener... | [
{
"created": "Sun, 26 Jun 2016 16:58:09 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Oct 2016 16:18:23 GMT",
"version": "v2"
}
] | 2016-11-08 | [
[
"Zimmerman",
"Aaron",
""
],
[
"Lewis",
"Adam G. M.",
""
],
[
"Pfeiffer",
"Harald P.",
""
]
] | The redshift factor $z$ is an invariant quantity of fundamental interest in post-Newtonian and self-force descriptions of compact binaries. It connects different approximation schemes, and plays a central role in the first law of binary black hole mechanics, which links local quantities to asymptotic measures of energy... |
1012.3834 | David Beke | D. Beke, N. Van den Bergh, L. Wylleman | Killing spinor space-times and constant-eigenvalue Killing tensors | 11 pages, submitted to CQG | null | 10.1088/0264-9381/28/10/105019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of Petrov type D Killing spinor space-times is presented, having the
peculiar property that their conformal representants can only admit Killing
tensors with constant eigenvalues.
| [
{
"created": "Fri, 17 Dec 2010 09:37:33 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Beke",
"D.",
""
],
[
"Bergh",
"N. Van den",
""
],
[
"Wylleman",
"L.",
""
]
] | A class of Petrov type D Killing spinor space-times is presented, having the peculiar property that their conformal representants can only admit Killing tensors with constant eigenvalues. |
1710.05475 | Zhoujian Cao Dr | Xiaokai He and Zhoujian Cao and Jiliang Jing | Note on the gravitational and electromagnetic radiation for the
Einstein-Maxwell equations with cosmological constant | Updated version of the published papers | IJMPD 24, 1550081 (2015) and IJMPD 25, 1650086 (2016) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the middle of last century, Bondi and his coworkers proposed an out going
boundary condition for the Einstein equations. Based on such boundary condition
the authors theoretically solved the puzzle of the existence problem of
gravitational wave. Currently many works on gravitational wave source modeling
use Bondi'... | [
{
"created": "Mon, 16 Oct 2017 02:45:43 GMT",
"version": "v1"
}
] | 2017-10-17 | [
[
"He",
"Xiaokai",
""
],
[
"Cao",
"Zhoujian",
""
],
[
"Jing",
"Jiliang",
""
]
] | In the middle of last century, Bondi and his coworkers proposed an out going boundary condition for the Einstein equations. Based on such boundary condition the authors theoretically solved the puzzle of the existence problem of gravitational wave. Currently many works on gravitational wave source modeling use Bondi's ... |
2011.04175 | Sergio Mendoza | S. Mendoza and S. Silva | The matter Lagrangian of an ideal fluid | 5 pages, accepted for publication in: International Journal of
Geometric Methods in Modern Physics (IJGMMP) | null | 10.1142/S0219887821500596 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the matter Lagrangian of an ideal fluid equals (up to a sign
-depending on its definition and on the chosen signature of the metric) the
total energy density of the fluid, i.e. rest energy density plus internal
energy density.
| [
{
"created": "Mon, 9 Nov 2020 03:54:39 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Dec 2020 01:52:36 GMT",
"version": "v2"
}
] | 2021-01-05 | [
[
"Mendoza",
"S.",
""
],
[
"Silva",
"S.",
""
]
] | We show that the matter Lagrangian of an ideal fluid equals (up to a sign -depending on its definition and on the chosen signature of the metric) the total energy density of the fluid, i.e. rest energy density plus internal energy density. |
1905.12452 | Camilo Posada | J. Ovalle, C. Posada and Z. Stuchl\'ik | Anisotropic ultracompact Schwarzschild star by gravitational decoupling | 20 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1905.10162 | Class. Quantum Grav. 36 205010, (2019) | 10.1088/1361-6382/ab4461 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ the minimal geometric deformation approach to gravitational
decoupling (MGD-decoupling) in order to generate an exact anisotropic and
non-uniform version of the ultracompact Schwarzschild star, or 'gravastar',
proposed by Mazur and Mottola. This new system represents an ultracompact
configuration of radius ... | [
{
"created": "Tue, 28 May 2019 14:51:04 GMT",
"version": "v1"
}
] | 2020-09-25 | [
[
"Ovalle",
"J.",
""
],
[
"Posada",
"C.",
""
],
[
"Stuchlík",
"Z.",
""
]
] | We employ the minimal geometric deformation approach to gravitational decoupling (MGD-decoupling) in order to generate an exact anisotropic and non-uniform version of the ultracompact Schwarzschild star, or 'gravastar', proposed by Mazur and Mottola. This new system represents an ultracompact configuration of radius $R... |
gr-qc/0607006 | Orfeu Bertolami | Orfeu Bertolami | The adventures of Spacetime | Chapter in the book Relativity and the Dimensionality of the World to
be published in the Springer series Fundamental Theories of Physics. Volume
Editor: Vesselin Petkov. 18 pages plus macros; updated references | null | 10.1007/978-1-4020-6318-3_3 | null | gr-qc astro-ph hep-th | null | We discuss how developments in physics often imply in the need that spacetime
acquires an increasingly richer and complex structure. General Relativity was
the first theory to show us the way to connect space and time with the physical
world. Since then, scrutinizing the ways spacetime might exist is, in a way,
the v... | [
{
"created": "Mon, 3 Jul 2006 11:31:39 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 2006 13:09:30 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Bertolami",
"Orfeu",
""
]
] | We discuss how developments in physics often imply in the need that spacetime acquires an increasingly richer and complex structure. General Relativity was the first theory to show us the way to connect space and time with the physical world. Since then, scrutinizing the ways spacetime might exist is, in a way, the ver... |
2104.04982 | Dmitri Fursaev | Dmitri Fursaev | Optical equations for null strings | 21 pages, 3 figures | Phys. Rev. D 103, 123526 (2021) | 10.1103/PhysRevD.103.123526 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An optical equation for null strings is derived. The equation is similar to
Sachs' optical equations for null geodesic congruences. The string optical
equation is given in terms of a single complex scalar function $Z$, which is a
combination of spin coefficients at the string trajectory. Real and imaginary
parts of $... | [
{
"created": "Sun, 11 Apr 2021 10:09:18 GMT",
"version": "v1"
}
] | 2021-06-16 | [
[
"Fursaev",
"Dmitri",
""
]
] | An optical equation for null strings is derived. The equation is similar to Sachs' optical equations for null geodesic congruences. The string optical equation is given in terms of a single complex scalar function $Z$, which is a combination of spin coefficients at the string trajectory. Real and imaginary parts of $Z$... |
0705.1669 | Bahtiyar Ozgur Sarioglu | S. Deser, O. Sarioglu, B. Tekin | Spherically symmetric solutions of Einstein + non-polynomial gravities | 6 pages, no figures, REVTeX 4 | Gen.Rel.Grav.40:1-7,2008 | 10.1007/s10714-007-0508-1 | null | gr-qc hep-th | null | We obtain the static spherically symmetric solutions of a class of
gravitational models whose additions to the General Relativity (GR) action
forbid Ricci-flat, in particular, Schwarzschild geometries. These theories are
selected to maintain the (first) derivative order of the Einstein equations in
Schwarzschild gaug... | [
{
"created": "Fri, 11 May 2007 15:18:51 GMT",
"version": "v1"
}
] | 2008-11-07 | [
[
"Deser",
"S.",
""
],
[
"Sarioglu",
"O.",
""
],
[
"Tekin",
"B.",
""
]
] | We obtain the static spherically symmetric solutions of a class of gravitational models whose additions to the General Relativity (GR) action forbid Ricci-flat, in particular, Schwarzschild geometries. These theories are selected to maintain the (first) derivative order of the Einstein equations in Schwarzschild gauge.... |
1512.06356 | Reza Rashidi | Reza Rashidi | Generalized Uncertainty Principle Removes The Chandrasekhar Limit | 15 pages | Annals of Physics, Volume 374, November 2016, Pages 434-443 | 10.1016/j.aop.2016.09.005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effect of a generalized uncertainty principle on the structure of an
ideal white dwarf star is investigated. The equation describing the equilibrium
configuration of the star is a generalized form of the Lane-Emden equation. It
is proved that the star always has a finite size. It is then argued that the
maximum m... | [
{
"created": "Sun, 20 Dec 2015 11:30:19 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Mar 2016 22:09:02 GMT",
"version": "v2"
}
] | 2017-01-11 | [
[
"Rashidi",
"Reza",
""
]
] | The effect of a generalized uncertainty principle on the structure of an ideal white dwarf star is investigated. The equation describing the equilibrium configuration of the star is a generalized form of the Lane-Emden equation. It is proved that the star always has a finite size. It is then argued that the maximum mas... |
2009.09385 | Zhen Li | Zhen Li, Yunjiao Gao, Xiao-Kan Guo | Weak cosmic censorship conjecture in higher-dimensional black holes with
nonlinear electrodynamic sources | 7 pages | Phys. Lett. B, 817, 136303 (2021) | 10.1016/j.physletb.2021.136303 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The new version of the gedanken experiments proposed by Sorce and Wald are
designed to test the validity of the weak cosmic censorship conjecture (WCCC)
by overspinning or overcharging the Kerr-Newman black hole in Einstein-Maxwell
gravity. Following their setup, in this paper, we investigate the WCCC in the
higher-d... | [
{
"created": "Sun, 20 Sep 2020 08:29:45 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2020 13:41:14 GMT",
"version": "v2"
}
] | 2021-04-27 | [
[
"Li",
"Zhen",
""
],
[
"Gao",
"Yunjiao",
""
],
[
"Guo",
"Xiao-Kan",
""
]
] | The new version of the gedanken experiments proposed by Sorce and Wald are designed to test the validity of the weak cosmic censorship conjecture (WCCC) by overspinning or overcharging the Kerr-Newman black hole in Einstein-Maxwell gravity. Following their setup, in this paper, we investigate the WCCC in the higher-dim... |
0903.4407 | Simone Mercuri | Simone Mercuri, Victor Taveras | Interaction of the Barbero--Immirzi Field with Matter and Pseudo-Scalar
Perturbations | V1: 13 pages. V2: 18 pages, 2 Sections added, references added,
presentation improved. V3: minor corrections, version accepted for
publication in PRD | Phys.Rev.D80:104007,2009 | 10.1103/PhysRevD.80.104007 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Loop Quantum Gravity the classical point of departure is the
Einstein-Hilbert action modified by the addition of the so-called Holst term.
Classically, this term does not affect the equations of motion, but it induces
a well-known quantization ambiguity in the quantum theory, parametrized by the
Barbero--Immirzi p... | [
{
"created": "Wed, 25 Mar 2009 18:42:54 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2009 19:43:09 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Nov 2009 18:33:46 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Mercuri",
"Simone",
""
],
[
"Taveras",
"Victor",
""
]
] | In Loop Quantum Gravity the classical point of departure is the Einstein-Hilbert action modified by the addition of the so-called Holst term. Classically, this term does not affect the equations of motion, but it induces a well-known quantization ambiguity in the quantum theory, parametrized by the Barbero--Immirzi par... |
gr-qc/0703040 | Jonathan R. Gair | Jonathan R Gair and Gareth Jones | Detecting LISA sources using time-frequency techniques | 3 pages; to appear in Proceedings of the Eleventh Marcel Grossmann
meeting | null | 10.1142/9789812834300_0422 | null | gr-qc | null | The planned Laser Interferometer Space Antenna (LISA) will detect
gravitational wave signals from a wide range of sources. However, disentangling
individual signals from the source-dominated data stream is a challenging
problem and the focus of much current research. The problems are particularly
acute for detection ... | [
{
"created": "Tue, 6 Mar 2007 14:40:21 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Gair",
"Jonathan R",
""
],
[
"Jones",
"Gareth",
""
]
] | The planned Laser Interferometer Space Antenna (LISA) will detect gravitational wave signals from a wide range of sources. However, disentangling individual signals from the source-dominated data stream is a challenging problem and the focus of much current research. The problems are particularly acute for detection of... |
1406.0048 | Junbin Li | Junbin Li, Xi-Ping Zhu | On the Local Extension of the Future Null Infinity | 52 pages | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a characteristic problem of the vacuum Einstein equations with
part of the initial data given on a future complete null cone with suitable
decay, and show that the solution exists uniformly around the null cone for
general such initial data. We can then define a segment of the future null
infinity. The in... | [
{
"created": "Sat, 31 May 2014 05:22:16 GMT",
"version": "v1"
}
] | 2014-06-03 | [
[
"Li",
"Junbin",
""
],
[
"Zhu",
"Xi-Ping",
""
]
] | We consider a characteristic problem of the vacuum Einstein equations with part of the initial data given on a future complete null cone with suitable decay, and show that the solution exists uniformly around the null cone for general such initial data. We can then define a segment of the future null infinity. The init... |
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