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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1702.04618 | Papantonopoulos Eleftherios | Theodoros Kolyvaris and Eleftherios Papantonopoulos | Superradiant Amplification of a Scalar Wave Coupled Kinematically to
Curvature Scattered off a Reissner-Nordstr\"om Black Hole | 12 pages, 8 figures, references added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We study the dynamics of a massive charged scalar wave which except its
canonical coupling to gravity it is also coupled kinematically to Einstein
tensor. We find that as the strength of the new coupling is increased the
scattered wave off the horizon of a Reissner-Nordstr\"om black hole is
superradiantly amplified r... | [
{
"created": "Wed, 15 Feb 2017 14:14:19 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2017 10:16:38 GMT",
"version": "v2"
}
] | 2017-03-02 | [
[
"Kolyvaris",
"Theodoros",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | We study the dynamics of a massive charged scalar wave which except its canonical coupling to gravity it is also coupled kinematically to Einstein tensor. We find that as the strength of the new coupling is increased the scattered wave off the horizon of a Reissner-Nordstr\"om black hole is superradiantly amplified res... |
1507.00476 | Simon Garruto | Lorenzo Fatibene, Simon Garruto | The Cauchy problem in General Relativity: An algebraic characterization | null | null | 10.1088/0264-9381/32/23/235010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we shall analyse the structure of the Cauchy Problem (CP
briefly) for General Relativity (GR briefly) by applying the theory of first
order symmetric hyperbolic systems.
| [
{
"created": "Thu, 2 Jul 2015 08:52:16 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2015 20:40:27 GMT",
"version": "v2"
}
] | 2015-11-11 | [
[
"Fatibene",
"Lorenzo",
""
],
[
"Garruto",
"Simon",
""
]
] | In this paper we shall analyse the structure of the Cauchy Problem (CP briefly) for General Relativity (GR briefly) by applying the theory of first order symmetric hyperbolic systems. |
1706.06280 | Sebastian Schuster | Sebastian Schuster (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Effective metrics and a fully covariant description of constitutive
tensors in electrodynamics | V1: 24 pages; V2: 14 pages (reformatted, minor typos fixed, no
physics changes) | Phys. Rev. D 96, 124019 (2017) | 10.1103/PhysRevD.96.124019 | null | gr-qc physics.class-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using electromagnetism to study analogue space-times is tantamount to
considering consistency conditions for when a given (meta-)material would
provide an analogue space-time model or --- vice versa --- characterizing which
given metric could be modelled with a (meta-)material. While the consistency
conditions themse... | [
{
"created": "Tue, 20 Jun 2017 06:14:57 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2017 03:01:04 GMT",
"version": "v2"
}
] | 2017-12-27 | [
[
"Schuster",
"Sebastian",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Using electromagnetism to study analogue space-times is tantamount to considering consistency conditions for when a given (meta-)material would provide an analogue space-time model or --- vice versa --- characterizing which given metric could be modelled with a (meta-)material. While the consistency conditions themselv... |
1708.06497 | Kelvyn Brito | K. P. S. de Brito | Review on Spinor Field and Applications to Physics | 13 pages, submitted to IJMPD | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | A review about spinor fields is presented, constructing a outlook through the
last century. Spinor was explored in many contexts more and more in the last
decades. Besides this, more papers about this issue has been produced in the
last decade than in the others before it. As examples, classifications of
spinor field... | [
{
"created": "Tue, 22 Aug 2017 04:48:50 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"de Brito",
"K. P. S.",
""
]
] | A review about spinor fields is presented, constructing a outlook through the last century. Spinor was explored in many contexts more and more in the last decades. Besides this, more papers about this issue has been produced in the last decade than in the others before it. As examples, classifications of spinor fields ... |
gr-qc/0403074 | Hector Ivan Arcos Velasco | H. I. Arcos, V. C. de Andrade and J. G. Pereira | Torsion and Gravitation: A new view | To appear on IJMPD | Int.J.Mod.Phys. D13 (2004) 807-818 | 10.1142/S0218271804003858 | null | gr-qc | null | According to the teleparallel equivalent of general relativity, curvature and
torsion are two equivalent ways of describing the same gravitational field.
Despite equivalent, however, they act differently: whereas curvature yields a
geometric description, in which the concept of gravitational force is absent,
torsion ... | [
{
"created": "Tue, 16 Mar 2004 20:25:00 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Arcos",
"H. I.",
""
],
[
"de Andrade",
"V. C.",
""
],
[
"Pereira",
"J. G.",
""
]
] | According to the teleparallel equivalent of general relativity, curvature and torsion are two equivalent ways of describing the same gravitational field. Despite equivalent, however, they act differently: whereas curvature yields a geometric description, in which the concept of gravitational force is absent, torsion ac... |
2302.08186 | Prado Martin-Moruno | Jos\'e A. R. Cembranos, Miguel Gonz\'alez Ortiz, Prado Mart\'in-Moruno | Graviton-photon oscillation in a cosmic background for a general theory
of gravity | V1:12 pages, 4 figures; V2: some clarifications included, references
added. Version accepted for publication in PRD | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Graviton-photon oscillation is the conversion of gravitational waves to
electromagnetic waves and vice versa in the presence of a background
electromagnetic field. We investigate this phenomenon in a cosmological
scenario considering a background cosmic magnetic field and assuming different
gravitational frameworks. ... | [
{
"created": "Thu, 16 Feb 2023 10:13:13 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Oct 2023 13:08:32 GMT",
"version": "v2"
}
] | 2023-10-10 | [
[
"Cembranos",
"José A. R.",
""
],
[
"Ortiz",
"Miguel González",
""
],
[
"Martín-Moruno",
"Prado",
""
]
] | Graviton-photon oscillation is the conversion of gravitational waves to electromagnetic waves and vice versa in the presence of a background electromagnetic field. We investigate this phenomenon in a cosmological scenario considering a background cosmic magnetic field and assuming different gravitational frameworks. We... |
1309.0807 | Ghulam Abbas | G. Abbas | Thermodynamics of Phantom Energy Accreting onto a Black Hole in
Einstein-Power-Maxwell Gravity | 10 pages, no figure, accepted for publication in Chin. Phys. Lett | Chin. Phys. Lett. 30 (2013) 100403 | 10.1088/0256-307X/30/10/100403 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the phantom energy accretion onto 3D black hole
formulated in Einstein-Power-Maxwell theory. We have presented the conditions
for critical accretion of phantom energy onto black hole. Further, we discuss
the thermodynamics of phantom energy accreting onto black hole and found that
first ... | [
{
"created": "Tue, 3 Sep 2013 10:37:23 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Abbas",
"G.",
""
]
] | In this paper, we investigate the phantom energy accretion onto 3D black hole formulated in Einstein-Power-Maxwell theory. We have presented the conditions for critical accretion of phantom energy onto black hole. Further, we discuss the thermodynamics of phantom energy accreting onto black hole and found that first la... |
gr-qc/0412047 | David R. Fiske | David R. Fiske | Error and symmetry analysis of Misner's algorithm for spherical harmonic
decomposition on a cubic grid | 10 pages, 3 tables, 1 figure. Version 2 has a broader introduction,
and includes additional information on choosing parameters | Class.Quant.Grav. 23 (2006) 5951-5960 | 10.1088/0264-9381/23/20/016 | null | gr-qc physics.comp-ph | null | Computing spherical harmonic decompositions is a ubiquitous technique that
arises in a wide variety of disciplines and a large number of scientific codes.
Because spherical harmonics are defined by integrals over spheres, however, one
must perform some sort of interpolation in order to compute them when data is
store... | [
{
"created": "Fri, 10 Dec 2004 19:36:08 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Sep 2005 15:29:07 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Fiske",
"David R.",
""
]
] | Computing spherical harmonic decompositions is a ubiquitous technique that arises in a wide variety of disciplines and a large number of scientific codes. Because spherical harmonics are defined by integrals over spheres, however, one must perform some sort of interpolation in order to compute them when data is stored ... |
1912.04005 | Christoforos Vlachos | Eleftherios Papantonopoulos, Christoforos Vlachos | Wormhole Solutions in Modified Brans-Dicke Theory | Major revision. The Introduction was extended explaining the main
motivation of the work. Explanations on the technical details were given.
More references were added. To be published in Phys. Rev. D. 18 pages , 7
figures | Phys. Rev. D 101, 064025 (2020) | 10.1103/PhysRevD.101.064025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a modified Brans-Dicke theory in which except the usual
Brans-Dicke parameter a new dimensionful parameter appears which modifies the
kinetic term of the scalar field coupled to gravity. Solving the coupled
Einstein-Klein-Gordon equations we find new spherically symmetric solutions.
Depending on the choic... | [
{
"created": "Mon, 9 Dec 2019 12:48:53 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2020 10:31:30 GMT",
"version": "v2"
}
] | 2020-03-18 | [
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Vlachos",
"Christoforos",
""
]
] | We consider a modified Brans-Dicke theory in which except the usual Brans-Dicke parameter a new dimensionful parameter appears which modifies the kinetic term of the scalar field coupled to gravity. Solving the coupled Einstein-Klein-Gordon equations we find new spherically symmetric solutions. Depending on the choices... |
gr-qc/0611005 | Tomas Janssen | Tomas Janssen and Tomislav Prokopec (Utrecht University) | Problems and hopes in nonsymmetric gravity | 9 pages, 1 figure. Based on two talks by the authors at the 2nd
International Conference on Quantum Theories and Renormalization Group in
Gravity and Cosmology (IRGAC) 2006, Barcelona | J.Phys.A40:7067-7074,2007 | 10.1088/1751-8113/40/25/S63 | SPIN-06-37, ITP-UU-06-47 | gr-qc astro-ph | null | We consider the linearized nonsymmetric theory of gravitation (NGT) within
the background of an expanding universe and near a Schwarzschild mass. We show
that the theory always develops instabilities unless the linearized
nonsymmetric lagrangian reduces to a particular simple form. This form contains
a gauge invarian... | [
{
"created": "Wed, 1 Nov 2006 10:44:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Janssen",
"Tomas",
"",
"Utrecht University"
],
[
"Prokopec",
"Tomislav",
"",
"Utrecht University"
]
] | We consider the linearized nonsymmetric theory of gravitation (NGT) within the background of an expanding universe and near a Schwarzschild mass. We show that the theory always develops instabilities unless the linearized nonsymmetric lagrangian reduces to a particular simple form. This form contains a gauge invariant ... |
1703.05969 | John Barrow | John D. Barrow and Chandrima Ganguly | Cyclic Mixmaster Universes | 19 pages, 27 figures | Phys. Rev. D 95, 083515 (2017) | 10.1103/PhysRevD.95.083515 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the behaviour of bouncing Bianchi type IX `Mixmaster'
universes in general relativity. This generalises all previous studies of the
cyclic behaviour of closed spatially homogeneous universes with and without
entropy increase. We determine the behaviour of models containing radiation by
analytic and num... | [
{
"created": "Fri, 17 Mar 2017 11:31:47 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2017 16:11:38 GMT",
"version": "v2"
}
] | 2017-05-03 | [
[
"Barrow",
"John D.",
""
],
[
"Ganguly",
"Chandrima",
""
]
] | We investigate the behaviour of bouncing Bianchi type IX `Mixmaster' universes in general relativity. This generalises all previous studies of the cyclic behaviour of closed spatially homogeneous universes with and without entropy increase. We determine the behaviour of models containing radiation by analytic and numer... |
gr-qc/0103110 | Irina Radinschi | I. Radinschi | Energy Associated with a Charged Regular Black Hole | LaTex, 1 figures | Horizons in World Physics, ed. Albert Reimer, Nova Science
Publishers, Inc., 2005, ISBN 1-59454-320-8 | null | null | gr-qc | null | We show that using an adequate coordinate transformation the charged regular
black hole solution given by Ayon-Beato and Garcia can be put in the
Kerr-Schild form. Then we use this metric in Kerr-Schild Cartesian coordinates
with a result given by Virbhadra and obtain the energy distribution associated
with this.
| [
{
"created": "Thu, 29 Mar 2001 14:12:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Radinschi",
"I.",
""
]
] | We show that using an adequate coordinate transformation the charged regular black hole solution given by Ayon-Beato and Garcia can be put in the Kerr-Schild form. Then we use this metric in Kerr-Schild Cartesian coordinates with a result given by Virbhadra and obtain the energy distribution associated with this. |
1201.4937 | Piotr T. Chru\'sciel | Piotr T. Chru\'sciel, Rafe Mazzeo | Initial data sets with ends of cylindrical type: I. The Lichnerowicz
equation | minor corrections | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct large classes of vacuum general relativistic initial data sets,
possibly with a cosmological constant Lambda, containing ends of cylindrical
type.
| [
{
"created": "Tue, 24 Jan 2012 09:57:21 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2014 08:04:57 GMT",
"version": "v2"
}
] | 2014-10-08 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Mazzeo",
"Rafe",
""
]
] | We construct large classes of vacuum general relativistic initial data sets, possibly with a cosmological constant Lambda, containing ends of cylindrical type. |
1911.11261 | Branislav Cvetkovi\'c | Milutin Blagojevi\'c and Branislav Cvetkovi\'c | Entropy in three-dimensional general relativity: Kerr-AdS black hole | LaTeX, 9 pages; v2 minor changes | Phys.Lett. B801 (2020) 135180 | 10.1016/j.physletb.2019.135180 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole thermodynamics of the Kerr-AdS spacetime in three-dimensional
general relativity is analyzed using a Hamiltonian approach. The values of the
conserved charges and entropy, obtained by a proper treatment of the AdS
asymptotic conditions, are shown to satisfy the first law of black hole
dynamics.
| [
{
"created": "Mon, 25 Nov 2019 22:38:23 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jan 2020 22:21:17 GMT",
"version": "v2"
}
] | 2020-01-23 | [
[
"Blagojević",
"Milutin",
""
],
[
"Cvetković",
"Branislav",
""
]
] | Black hole thermodynamics of the Kerr-AdS spacetime in three-dimensional general relativity is analyzed using a Hamiltonian approach. The values of the conserved charges and entropy, obtained by a proper treatment of the AdS asymptotic conditions, are shown to satisfy the first law of black hole dynamics. |
gr-qc/9404052 | null | Dmitri Vassilevich | Vector Fields on a Disk with Mixed Boundary Conditions | 15 pp, Latex, SPbU-IP-94-6 | J.Math.Phys. 36 (1995) 3174-3182 | 10.1063/1.531021 | null | gr-qc | null | We study vector fields on a disk satisfying two types of mixed boundary
conditions. These boundary conditions are selected by BRST-invariance in
electrodynamics. They also appear in the de Rham complex. The manifest
construction of the harmonic expansion is presented. The eigenfunctions of the
vector Laplace operator... | [
{
"created": "Mon, 25 Apr 1994 13:00:14 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Vassilevich",
"Dmitri",
""
]
] | We study vector fields on a disk satisfying two types of mixed boundary conditions. These boundary conditions are selected by BRST-invariance in electrodynamics. They also appear in the de Rham complex. The manifest construction of the harmonic expansion is presented. The eigenfunctions of the vector Laplace operator a... |
1008.0296 | Clifford M. Will | Clifford M. Will | Resource Letter PTG-1: Precision Tests of Gravity | 9 pages; submitted to American Journal of Physics | American Journal of Physics 78(12), 1240 (2010) | 10.1119/1.3481700 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This resource letter provides an introduction to some of the main current
topics in experimental tests of general relativity as well as to some of the
historical literature. It is intended to serve as a guide to the field for
upper-division undergraduate and graduate students, both theoretical and
experimental, and f... | [
{
"created": "Mon, 2 Aug 2010 13:04:58 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Will",
"Clifford M.",
""
]
] | This resource letter provides an introduction to some of the main current topics in experimental tests of general relativity as well as to some of the historical literature. It is intended to serve as a guide to the field for upper-division undergraduate and graduate students, both theoretical and experimental, and for... |
gr-qc/0509078 | Leonardo Modesto | Leonardo Modesto | Loop quantum black hole | 12 pages, latex. We introduce and we calculate the spectrum of the
operator 1/|E| | Class.Quant.Grav. 23 (2006) 5587-5602 | 10.1088/0264-9381/23/18/006 | null | gr-qc | null | In this paper we consider the Kantowski-Sachs space-time in Ashtekar
variables and the quantization of this space-time starting from the complete
loop quantum gravity theory. The Kanthowski-Sachs space-time coincides with the
Schwarzschild black hole solution inside the horizon. By studying this model we
can obtain i... | [
{
"created": "Tue, 20 Sep 2005 13:59:05 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Oct 2005 15:48:24 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Modesto",
"Leonardo",
""
]
] | In this paper we consider the Kantowski-Sachs space-time in Ashtekar variables and the quantization of this space-time starting from the complete loop quantum gravity theory. The Kanthowski-Sachs space-time coincides with the Schwarzschild black hole solution inside the horizon. By studying this model we can obtain inf... |
1505.03805 | Shreya Banerjee | Shreya Banerjee, Sayantani Bera and Tejinder P. Singh | Cosmological Constant, Quantum Measurement, and the Problem of Time | 5 pages, honorable mention in Gravity Research Foundation essay
contest 2015 | Int. J. Mod. Phys. 24 (2015) 1544011 | 10.1142/S0218271815440113 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Three of the big puzzles of theoretical physics are the following: (i) There
is apparently no time evolution in the dynamics of quantum general relativity,
because the allowed quantum states must obey the Hamiltonian constraint. (ii)
During a quantum measurement, the state of the quantum system randomly
collapses fro... | [
{
"created": "Thu, 14 May 2015 17:30:48 GMT",
"version": "v1"
}
] | 2015-12-29 | [
[
"Banerjee",
"Shreya",
""
],
[
"Bera",
"Sayantani",
""
],
[
"Singh",
"Tejinder P.",
""
]
] | Three of the big puzzles of theoretical physics are the following: (i) There is apparently no time evolution in the dynamics of quantum general relativity, because the allowed quantum states must obey the Hamiltonian constraint. (ii) During a quantum measurement, the state of the quantum system randomly collapses from ... |
2003.04893 | Muhammad Sharif | M. Sharif and Faisal Javed | Stability of Gravastars with Exterior Regular Black Holes | 17 pages, 5 figures | Ann. Phys. 415(2020)168124 | 10.1016/j.aop.2020.168124 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper examines the stability of thin-shell gravastars in the context of
regular spacetimes (Bardeen and Bardeen-de Sitter black holes). We apply cut
and paste approach to construct gravastars through the matching of interior
non-singular de Sitter geometry with exterior regular black hole. This model
contains th... | [
{
"created": "Tue, 10 Mar 2020 02:39:23 GMT",
"version": "v1"
}
] | 2022-07-20 | [
[
"Sharif",
"M.",
""
],
[
"Javed",
"Faisal",
""
]
] | This paper examines the stability of thin-shell gravastars in the context of regular spacetimes (Bardeen and Bardeen-de Sitter black holes). We apply cut and paste approach to construct gravastars through the matching of interior non-singular de Sitter geometry with exterior regular black hole. This model contains thre... |
1301.6173 | Flavio Mercati | Julian Barbour, Matteo Lostaglio, Flavio Mercati | Scale Anomaly as the Origin of Time | 31 pages, 5 figures | Gen. Rel. Grav. 45 (2013), 911-938 | 10.1007/s10714-013-1516-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the problem of time in quantum gravity in a point-particle
analogue model of scale-invariant gravity. If quantized after reduction to true
degrees of freedom, it leads to a time-independent Schr\"odinger equation. As
with the Wheeler--DeWitt equation, time disappears, and a frozen formalism that
gives a st... | [
{
"created": "Fri, 25 Jan 2013 21:06:26 GMT",
"version": "v1"
}
] | 2013-04-16 | [
[
"Barbour",
"Julian",
""
],
[
"Lostaglio",
"Matteo",
""
],
[
"Mercati",
"Flavio",
""
]
] | We explore the problem of time in quantum gravity in a point-particle analogue model of scale-invariant gravity. If quantized after reduction to true degrees of freedom, it leads to a time-independent Schr\"odinger equation. As with the Wheeler--DeWitt equation, time disappears, and a frozen formalism that gives a stat... |
2304.02734 | Mykhailo Tataryn | Mykhailo Tataryn and Mykola Stetsko | Three-dimensional slowly rotating black hole in Einstein-power-Maxwell
theory | null | International Journal of Modern Physics D. Vol. 29, 2050111 (2020) | 10.1142/S0218271820501114 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A three-dimensional slowly rotating black hole solution in the presence of
negative cosmological constant in the Einstein-power-Maxwell theory is studied.
It is shown that in the small rotation limit the electric field, diagonal
metric function and thermodynamic properties in the small rotation limit are
the same as ... | [
{
"created": "Wed, 5 Apr 2023 20:32:00 GMT",
"version": "v1"
}
] | 2023-04-07 | [
[
"Tataryn",
"Mykhailo",
""
],
[
"Stetsko",
"Mykola",
""
]
] | A three-dimensional slowly rotating black hole solution in the presence of negative cosmological constant in the Einstein-power-Maxwell theory is studied. It is shown that in the small rotation limit the electric field, diagonal metric function and thermodynamic properties in the small rotation limit are the same as fo... |
gr-qc/0506050 | William A. Hiscock | Daniel Bambeck and William A. Hiscock | Effects of nonzero neutrino masses on black hole evaporation | 8 pages, REVTeX | Class.Quant.Grav. 22 (2005) 4247-4252 | 10.1088/0264-9381/22/20/006 | null | gr-qc | null | We study the consequences of nonzero neutrino masses for black holes
evaporating by the emission of Hawking radiation. We find that the evolution of
small, hot, black holes may be unaffected (if neutrinos are Majorana
particles), or may show an increase in neutrino luminosity and a decrease in
lifetime by up to a fac... | [
{
"created": "Wed, 8 Jun 2005 17:11:08 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Bambeck",
"Daniel",
""
],
[
"Hiscock",
"William A.",
""
]
] | We study the consequences of nonzero neutrino masses for black holes evaporating by the emission of Hawking radiation. We find that the evolution of small, hot, black holes may be unaffected (if neutrinos are Majorana particles), or may show an increase in neutrino luminosity and a decrease in lifetime by up to a facto... |
1101.1558 | Yurii Ignatyev | Yu.G. Ignatyev, N. Elmakhi | Dynamic model of spherical perturbations in the Friedman universe. III.
Automodel solutions | 12 pages, 4 figures, 8 references | Russ.Phys.J. 52:15-24,2009 | 10.1007/s11182-009-9197-4 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of exact spherically symmetric perturbations of retarding automodel
solutions linearized around Friedman background of Einstein equations for an
ideal fluid with an arbitrary barotrope value is obtained and investigated.
| [
{
"created": "Sat, 8 Jan 2011 00:30:44 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Ignatyev",
"Yu. G.",
""
],
[
"Elmakhi",
"N.",
""
]
] | A class of exact spherically symmetric perturbations of retarding automodel solutions linearized around Friedman background of Einstein equations for an ideal fluid with an arbitrary barotrope value is obtained and investigated. |
2404.01086 | Malay K. Nandy | Muhammed Shafeeque and Malay K. Nandy | Stability of charged scalar hair on a Reissner-Nordstr\"om black hole | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Israel-Carter theorem (also known as the ``no-hair theorem'') puts a
restriction on the existence of parameters other than mass, electric charge,
and angular momentum of a black hole. In this context, Bekenstein proposed
no-hair theorems in various black hole models with neutral and electrically
charged scalar fi... | [
{
"created": "Mon, 1 Apr 2024 12:33:20 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2024 21:45:21 GMT",
"version": "v2"
}
] | 2024-06-11 | [
[
"Shafeeque",
"Muhammed",
""
],
[
"Nandy",
"Malay K.",
""
]
] | The Israel-Carter theorem (also known as the ``no-hair theorem'') puts a restriction on the existence of parameters other than mass, electric charge, and angular momentum of a black hole. In this context, Bekenstein proposed no-hair theorems in various black hole models with neutral and electrically charged scalar fiel... |
2307.05844 | Deepen Garg | Deepen Garg and I. Y. Dodin | Self-consistent interaction of linear gravitational and electromagnetic
waves in non-magnetized plasma | 15 pages | JCAP02 (2024) 045 | 10.1088/1475-7516/2024/02/045 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This paper explores the hybridization of linear metric perturbations with
linear electromagnetic (EM) perturbations in non-magnetized plasma for a
general background metric. The local wave properties are derived from first
principles for inhomogeneous plasma, without assuming any symmetries of the
background metric. ... | [
{
"created": "Tue, 11 Jul 2023 23:35:21 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2023 21:19:34 GMT",
"version": "v2"
}
] | 2024-02-28 | [
[
"Garg",
"Deepen",
""
],
[
"Dodin",
"I. Y.",
""
]
] | This paper explores the hybridization of linear metric perturbations with linear electromagnetic (EM) perturbations in non-magnetized plasma for a general background metric. The local wave properties are derived from first principles for inhomogeneous plasma, without assuming any symmetries of the background metric. Fi... |
2004.06155 | Anzhong Wang | Chao Zhang, Xiang Zhao, Kai Lin, Shaojun Zhang, Wen Zhao, Anzhong Wang | Spherically symmetric static black holes in Einstein-aether theory | revtex4, 9 figures, 6 tables. References are updated. Phys. Rev.
D102, 064043 (2020) | Phys. Rev. D 102, 064043 (2020) | 10.1103/PhysRevD.102.064043 | null | gr-qc astro-ph.GA hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we systematically study spherically symmetric static
spacetimes in the framework of Einstein-aether theory, and pay particular
attention to the existence of black holes (BHs). In the present studies we
first clarify several subtle issues. In particular, we find that, out of the
five non-trivial field e... | [
{
"created": "Mon, 13 Apr 2020 19:01:02 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Apr 2020 22:41:38 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Aug 2020 00:09:58 GMT",
"version": "v3"
},
{
"created": "Wed, 16 Sep 2020 18:52:25 GMT",
"version": "v4"
}
] | 2020-09-18 | [
[
"Zhang",
"Chao",
""
],
[
"Zhao",
"Xiang",
""
],
[
"Lin",
"Kai",
""
],
[
"Zhang",
"Shaojun",
""
],
[
"Zhao",
"Wen",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we systematically study spherically symmetric static spacetimes in the framework of Einstein-aether theory, and pay particular attention to the existence of black holes (BHs). In the present studies we first clarify several subtle issues. In particular, we find that, out of the five non-trivial field equ... |
gr-qc/9902059 | Santiago Esteban Perez Bergliaffa | Santiago E. Perez Bergliaffa | Inhomogeneous Multidimensional Cosmologies | RevTeX, 12 pages, discussion on the fulfillment of the energy
conditions added. Accepted for publication in Mod. Phys. Lett. A | Mod.Phys.Lett. A15 (2000) 531-539 | null | null | gr-qc | null | Einstein's equations for a 4+n-dimensional inhomogeneous space-time are
presented, and a special family of solutions is exhibited for an arbitrary n.
The solutions depend on two arbitrary functions of time. The time development
of a particular member of this family is studied. This solution exhibits a
singularity at ... | [
{
"created": "Fri, 19 Feb 1999 17:04:51 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2000 16:48:15 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bergliaffa",
"Santiago E. Perez",
""
]
] | Einstein's equations for a 4+n-dimensional inhomogeneous space-time are presented, and a special family of solutions is exhibited for an arbitrary n. The solutions depend on two arbitrary functions of time. The time development of a particular member of this family is studied. This solution exhibits a singularity at t=... |
1302.6527 | Aur\'elien Hees | A. Hees and A. F\"uzfa | Can the Chameleon mechanism explain cosmic acceleration while satisfying
Solar System constraints ? | 3 pages, proceedings of 13th Marcel Grossmann Meeting | null | 10.1142/9789814623995_0102 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The chameleon mechanism appearing in massive tensor-scalar theory of gravity
can effectively reduce the nonminimal coupling between the scalar field and
matter. This mechanism is invoked to reconcile cosmological data requiring
introduction of Dark Energy with small-scale stringent constraints on General
Relativity. ... | [
{
"created": "Tue, 26 Feb 2013 18:38:41 GMT",
"version": "v1"
}
] | 2017-02-22 | [
[
"Hees",
"A.",
""
],
[
"Füzfa",
"A.",
""
]
] | The chameleon mechanism appearing in massive tensor-scalar theory of gravity can effectively reduce the nonminimal coupling between the scalar field and matter. This mechanism is invoked to reconcile cosmological data requiring introduction of Dark Energy with small-scale stringent constraints on General Relativity. In... |
2104.11782 | Carlos A. S. Almeida | A. R. P. Moreira, J. E. G. Silva, and C. A. S. Almeida | Teleparallel gravity: Effects of torsion in 6D braneworlds | 15 pages, 11 figures. arXiv admin note: text overlap with
arXiv:2006.06891 | null | 10.1142/S0218271821501030 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Braneworld models are interesting theoretical and phenomenological frameworks
to search for new physics beyond the standard model of particles and cosmology.
In this work, we discuss braneworld models whose gravitational dynamics are
governed by teleparallel $f(T)$ gravities. Here, we emphasize a codimension two
axis... | [
{
"created": "Fri, 23 Apr 2021 18:56:10 GMT",
"version": "v1"
}
] | 2021-11-17 | [
[
"Moreira",
"A. R. P.",
""
],
[
"Silva",
"J. E. G.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] | Braneworld models are interesting theoretical and phenomenological frameworks to search for new physics beyond the standard model of particles and cosmology. In this work, we discuss braneworld models whose gravitational dynamics are governed by teleparallel $f(T)$ gravities. Here, we emphasize a codimension two axisym... |
1412.6350 | Alvaro de la Cruz-Dombriz | M. Abdelwahab (U. Cape Town ACGC), A. de la Cruz-Dombriz (Madrid U.),
P. K. S. Dunsby (U. Cape Town ACGC and SAAO) and B. Mongwane (U. Cape Town
ACGC) | Constraining the gravitational action with CMB tensor anisotropies | 10 pages, 12 figures, 1 Appendix | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a complete analysis of the imprint of tensor anisotropies on the
Cosmic Microwave Background for a class of f(R) gravity theories within the
PPF-CAMB framework. We derive the equations, both for the cosmological
background and gravitational wave perturbations, required to obtain the
standard temperature an... | [
{
"created": "Fri, 19 Dec 2014 14:09:08 GMT",
"version": "v1"
}
] | 2014-12-22 | [
[
"Abdelwahab",
"M.",
"",
"U. Cape Town ACGC"
],
[
"de la Cruz-Dombriz",
"A.",
"",
"Madrid U."
],
[
"Dunsby",
"P. K. S.",
"",
"U. Cape Town ACGC and SAAO"
],
[
"Mongwane",
"B.",
"",
"U. Cape Town\n ACGC"
]
] | We present a complete analysis of the imprint of tensor anisotropies on the Cosmic Microwave Background for a class of f(R) gravity theories within the PPF-CAMB framework. We derive the equations, both for the cosmological background and gravitational wave perturbations, required to obtain the standard temperature and ... |
2011.14468 | Hal Haggard | Seth K. Asante, Bianca Dittrich, and Hal M. Haggard | Discrete gravity dynamics from effective spin foams | 39 pages, 19 figures | null | 10.1088/1361-6382/ac011b | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The first computation of a spin foam dynamics that provides a test of the
quantum equations of motions of gravity is presented. Specifically, a
triangulation that includes an inner edge is treated. The computation leverages
the recently introduced effective spin foam models, which are particularly
numerically efficie... | [
{
"created": "Sun, 29 Nov 2020 23:23:10 GMT",
"version": "v1"
},
{
"created": "Sun, 2 May 2021 18:38:06 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Asante",
"Seth K.",
""
],
[
"Dittrich",
"Bianca",
""
],
[
"Haggard",
"Hal M.",
""
]
] | The first computation of a spin foam dynamics that provides a test of the quantum equations of motions of gravity is presented. Specifically, a triangulation that includes an inner edge is treated. The computation leverages the recently introduced effective spin foam models, which are particularly numerically efficient... |
gr-qc/0401118 | Korotkin Dmitry | E.Ferapontov, D.Korotkin, V.Shramchenko | Boyer-Finley equation and systems of hydrodynamic type | null | Class.Quant.Grav. 19 (2002) L205-L210 | 10.1088/0264-9381/19/24/101 | null | gr-qc | null | We reduce Boyer-Finley equation to a family of compatible systems of
hydrodynamic type, with characteristic speeds expressed in terms of spaces of
rational functions. The systems of hydrodynamic type are then solved by the
generalized hodograph method, providing solutions of the Boyer-Finley equation
including functi... | [
{
"created": "Thu, 29 Jan 2004 03:32:04 GMT",
"version": "v1"
}
] | 2022-05-04 | [
[
"Ferapontov",
"E.",
""
],
[
"Korotkin",
"D.",
""
],
[
"Shramchenko",
"V.",
""
]
] | We reduce Boyer-Finley equation to a family of compatible systems of hydrodynamic type, with characteristic speeds expressed in terms of spaces of rational functions. The systems of hydrodynamic type are then solved by the generalized hodograph method, providing solutions of the Boyer-Finley equation including function... |
2403.12879 | Oleg Zaslavskii | O. B. Zaslavskii | General properties of the electric Penrose process | 37 pages. Substantial revision. To appear in PRD | Phys. Rev. D 109, 124053 (2024) | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the Penrose process with the charged particles in the
Reissner-Nordstr\"{o}m (RN) background. Let parent particle 0 decay to
particles 1 and 2. With the assumption that all three particles move in the
equatorial plane, the exact formulas for characteristics of particles 1 and 2
in terms of those of partic... | [
{
"created": "Tue, 19 Mar 2024 16:24:54 GMT",
"version": "v1"
},
{
"created": "Wed, 29 May 2024 13:22:00 GMT",
"version": "v2"
}
] | 2024-06-21 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider the Penrose process with the charged particles in the Reissner-Nordstr\"{o}m (RN) background. Let parent particle 0 decay to particles 1 and 2. With the assumption that all three particles move in the equatorial plane, the exact formulas for characteristics of particles 1 and 2 in terms of those of particle... |
1201.1608 | Hernando Quevedo | Hernando Quevedo | Multipolar Solutions | Final version. To be published in Proceedings of the XIVth Brazilian
School of Cosmology and Gravitation | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of exact solutions of the Einstein-Maxwell equations is presented
which contains infinite sets of gravitoelectric, gravitomagnetic and
electromagnetic multipole moments. The multipolar structure of the solutions
indicates that they can be used to describe the exterior gravitational field of
an arbitrarily rot... | [
{
"created": "Sun, 8 Jan 2012 05:37:06 GMT",
"version": "v1"
}
] | 2012-01-10 | [
[
"Quevedo",
"Hernando",
""
]
] | A class of exact solutions of the Einstein-Maxwell equations is presented which contains infinite sets of gravitoelectric, gravitomagnetic and electromagnetic multipole moments. The multipolar structure of the solutions indicates that they can be used to describe the exterior gravitational field of an arbitrarily rotat... |
1005.2518 | Tomo Tanaka | Tomo Tanaka, Fumitoshi Amemiya, Masahiro Shimano, Tomohiro Harada,
Takashi Tamaki | Discretisation parameter and operator ordering in loop quantum cosmology
with the cosmological constant | 15 pages, 5 figures | Phys.Rev.D83:104049,2011 | 10.1103/PhysRevD.83.104049 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In loop quantum cosmology, the Hamiltonian reduces to a finite difference
operator. We study the initial singularity and the large volume limit against
the ambiguities in the discretisation and the operator ordering within a
homogeneous, isotropic and spatially flat model with the cosmological constant.
We find that ... | [
{
"created": "Fri, 14 May 2010 13:22:25 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Tanaka",
"Tomo",
""
],
[
"Amemiya",
"Fumitoshi",
""
],
[
"Shimano",
"Masahiro",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Tamaki",
"Takashi",
""
]
] | In loop quantum cosmology, the Hamiltonian reduces to a finite difference operator. We study the initial singularity and the large volume limit against the ambiguities in the discretisation and the operator ordering within a homogeneous, isotropic and spatially flat model with the cosmological constant. We find that th... |
1711.10896 | Chao Liu | Chao Liu, Todd A. Oliynyk | Cosmological Newtonian limits on large spacetime scales | 74 pages. Agrees with published version. arXiv admin note: text
overlap with arXiv:1701.03975 | Communications in Mathematical Physics (2018) | 10.1007/s00220-018-3214-9 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the existence of $1$-parameter families of $\epsilon$-dependent
solutions to the Einstein-Euler equations with a positive cosmological constant
$\Lambda >0$ and a linear equation of state $p=\epsilon^2 K \rho$, $0<K\leq
1/3$, for the parameter values $0<\epsilon < \epsilon_0$. These solutions exist
globa... | [
{
"created": "Tue, 28 Nov 2017 07:02:21 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2018 04:12:10 GMT",
"version": "v2"
}
] | 2018-07-27 | [
[
"Liu",
"Chao",
""
],
[
"Oliynyk",
"Todd A.",
""
]
] | We establish the existence of $1$-parameter families of $\epsilon$-dependent solutions to the Einstein-Euler equations with a positive cosmological constant $\Lambda >0$ and a linear equation of state $p=\epsilon^2 K \rho$, $0<K\leq 1/3$, for the parameter values $0<\epsilon < \epsilon_0$. These solutions exist globall... |
2206.14755 | Edward Wilson-Ewing | Pietro Don\`a, Pietropaolo Frisoni, Edward Wilson-Ewing | Radiative corrections to the Lorentzian EPRL spin foam propagator | 20 pages, 11 figures | Phys.Rev.D 106 (2022) 6, 066022 | 10.1103/PhysRevD.106.066022 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We numerically estimate the divergence of several two-vertex diagrams that
contribute to the radiative corrections for the Lorentzian EPRL spin foam
propagator. We compute the amplitudes as functions of a homogeneous cutoff over
the bulk quantum numbers, fixed boundary data, and different Immirzi
parameters, and find... | [
{
"created": "Wed, 29 Jun 2022 16:37:04 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 15:42:42 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Nov 2022 17:31:21 GMT",
"version": "v3"
}
] | 2022-11-04 | [
[
"Donà",
"Pietro",
""
],
[
"Frisoni",
"Pietropaolo",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | We numerically estimate the divergence of several two-vertex diagrams that contribute to the radiative corrections for the Lorentzian EPRL spin foam propagator. We compute the amplitudes as functions of a homogeneous cutoff over the bulk quantum numbers, fixed boundary data, and different Immirzi parameters, and find t... |
1703.06522 | Hamid Shabani | Hamid Shabani, Amir Hadi ziaie | Late-time cosmological evolution of a general class of f(R, T) gravity
with minimal curvature-matter coupling | 28 pages, 4 figures | Eur. Phys. J. C 77:507 (2017) | 10.1140/epjc/s10052-017-5077-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the late-time cosmological solutions of
f(R,T)=g(R)+h(-T) models assuming that the conservation of the energy-momentum
tensor (EMT) is violated. We perform our analysis through constructing an
autonomous dynamical system for the equations of motion. We study the stability
properties of solution... | [
{
"created": "Sun, 19 Mar 2017 21:48:54 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2017 08:43:49 GMT",
"version": "v2"
}
] | 2017-08-07 | [
[
"Shabani",
"Hamid",
""
],
[
"ziaie",
"Amir Hadi",
""
]
] | In this work, we study the late-time cosmological solutions of f(R,T)=g(R)+h(-T) models assuming that the conservation of the energy-momentum tensor (EMT) is violated. We perform our analysis through constructing an autonomous dynamical system for the equations of motion. We study the stability properties of solutions ... |
gr-qc/0010062 | Sibusiso Xulu | S. S. Xulu | M{\o}ller Energy for the Kerr-Newman metric | 8 pages, 1 eps figure, RevTex, accepted for publication in Mod. Phys.
Lett. A | Mod.Phys.Lett.A15:1511-1517,2000 | 10.1142/S0217732300001651 | null | gr-qc | null | The energy distribution in the Kerr-Newman space-time is computed using the
M{\o}ller energy-momentum complex. This agrees with the Komar mass for this
space-time obtained by Cohen and de Felice. These results support the
Cooperstock hypothesis.
| [
{
"created": "Wed, 18 Oct 2000 12:40:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Xulu",
"S. S.",
""
]
] | The energy distribution in the Kerr-Newman space-time is computed using the M{\o}ller energy-momentum complex. This agrees with the Komar mass for this space-time obtained by Cohen and de Felice. These results support the Cooperstock hypothesis. |
2103.00584 | Anna Ijjas | Anna Ijjas, Andrew P. Sullivan, Frans Pretorius, Paul J. Steinhardt,
William G. Cook | Ultralocality and Slow Contraction | 27 pages, 10 figures | JCAP 06 (2021) 013 | 10.1088/1475-7516/2021/06/013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the detailed process by which slow contraction smooths and flattens
the universe using an improved numerical relativity code that accepts initial
conditions with non-perturbative deviations from homogeneity and isotropy along
two independent spatial directions. Contrary to common descriptions of the
early un... | [
{
"created": "Sun, 28 Feb 2021 18:33:53 GMT",
"version": "v1"
}
] | 2021-06-09 | [
[
"Ijjas",
"Anna",
""
],
[
"Sullivan",
"Andrew P.",
""
],
[
"Pretorius",
"Frans",
""
],
[
"Steinhardt",
"Paul J.",
""
],
[
"Cook",
"William G.",
""
]
] | We study the detailed process by which slow contraction smooths and flattens the universe using an improved numerical relativity code that accepts initial conditions with non-perturbative deviations from homogeneity and isotropy along two independent spatial directions. Contrary to common descriptions of the early univ... |
1305.7220 | Juan Pedraza | P. H. Nguyen and J. F. Pedraza | Anisotropic Models for Globular Clusters, Galactic Bulges and Dark Halos | 54 pages; v2: Version published in PRD | Phys. Rev. D 88, 064020 (2013) | 10.1103/PhysRevD.88.064020 | TCC-008-13, UTTG-11-13 | gr-qc astro-ph.CO astro-ph.GA astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spherical systems with polytropic equations of state are of great interest in
astrophysics. They are widely used to describe neutron stars, red giants, white
dwarfs, brown dwarfs, main sequence stars, galactic halos, and globular
clusters of diverse sizes. In this paper we construct analytically a family of
self-grav... | [
{
"created": "Thu, 30 May 2013 19:50:22 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Sep 2013 18:33:35 GMT",
"version": "v2"
}
] | 2013-09-24 | [
[
"Nguyen",
"P. H.",
""
],
[
"Pedraza",
"J. F.",
""
]
] | Spherical systems with polytropic equations of state are of great interest in astrophysics. They are widely used to describe neutron stars, red giants, white dwarfs, brown dwarfs, main sequence stars, galactic halos, and globular clusters of diverse sizes. In this paper we construct analytically a family of self-gravit... |
2202.01371 | R. R. Cuzinatto | R. R. Cuzinatto, R. F. L. Holanda, S. H. Pereira | Observational constraints on varying fundamental constants in a minimal
CPC model | 13 pages, 2 figures. v2: new references and some comments added. v3:
content matches the published version | MNRAS 519, 633-640 (2023) | 10.1093/mnras/stac3267 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A minimal model based on the Co-varying Physical Couplings (CPC) framework
for gravity is proposed. The CPC framework is based on the assumptions of a
metric-compatible four-dimensional Riemannian manifold where a covariantly
conserved stress-energy tensor acts as source of the field equations which are
formally the ... | [
{
"created": "Thu, 3 Feb 2022 02:09:26 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Mar 2022 00:48:01 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Dec 2022 20:12:14 GMT",
"version": "v3"
}
] | 2023-01-03 | [
[
"Cuzinatto",
"R. R.",
""
],
[
"Holanda",
"R. F. L.",
""
],
[
"Pereira",
"S. H.",
""
]
] | A minimal model based on the Co-varying Physical Couplings (CPC) framework for gravity is proposed. The CPC framework is based on the assumptions of a metric-compatible four-dimensional Riemannian manifold where a covariantly conserved stress-energy tensor acts as source of the field equations which are formally the sa... |
1708.01359 | Yasusada Nambu | Shingo Kukita and Yasusada Nambu | Harvesting large scale entanglement in de Sitter space with multiple
detectors | 18 pages, accepted version in Entropy | Entropy 2017, 19, 449 | 10.3390/e19090449 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider entanglement harvesting in de Sitter space using a model of
multiple qubit detectors. We obtain the formula of the entanglement negativity
for this system. Applying the obtained formula, we find that it is possible to
access to the entanglement on the super horizon scale if sufficiently large
number of de... | [
{
"created": "Fri, 4 Aug 2017 02:57:01 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2017 00:34:00 GMT",
"version": "v2"
}
] | 2017-08-30 | [
[
"Kukita",
"Shingo",
""
],
[
"Nambu",
"Yasusada",
""
]
] | We consider entanglement harvesting in de Sitter space using a model of multiple qubit detectors. We obtain the formula of the entanglement negativity for this system. Applying the obtained formula, we find that it is possible to access to the entanglement on the super horizon scale if sufficiently large number of dete... |
1101.1414 | Yurii Ignatyev | Yu.G. Ignatyev, N. Elmakhi | Dinamic model of spherical perturbations in Friedmann Universe | 15 pages, 1 figure, 10 references | Russian Physics Journal, Vol. 51, No. 1, 2008 | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A selfconsistent system of equations describing evolution of linear
spherically symmetric perturbations in Fridmann world by an arbitrary equation
of state is obtained. The perturbations singular part corresponding to massive
particle-like source is extracted, an evolutionary equation for mass of this
source is obtai... | [
{
"created": "Fri, 7 Jan 2011 12:07:46 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Ignatyev",
"Yu. G.",
""
],
[
"Elmakhi",
"N.",
""
]
] | A selfconsistent system of equations describing evolution of linear spherically symmetric perturbations in Fridmann world by an arbitrary equation of state is obtained. The perturbations singular part corresponding to massive particle-like source is extracted, an evolutionary equation for mass of this source is obtaine... |
gr-qc/0410128 | Ernesto F. Eiroa | Ernesto F. Eiroa | Braneworld black hole gravitational lens: Strong field limit analysis | 11 pages, 1 figure; v2: extended conclusions, one new reference
added, typos corrected | Phys.Rev. D71 (2005) 083010 | 10.1103/PhysRevD.71.083010 | null | gr-qc astro-ph hep-ph | null | In this paper, a braneworld black hole is studied as a gravitational lens,
using the strong field limit to obtain the positions and magnifications of the
relativistic images. Standard lensing and retrolensing situations are analyzed
in a unified setting, and the results are compared with those corresponding to
the Sc... | [
{
"created": "Wed, 27 Oct 2004 19:51:58 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2005 21:49:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Eiroa",
"Ernesto F.",
""
]
] | In this paper, a braneworld black hole is studied as a gravitational lens, using the strong field limit to obtain the positions and magnifications of the relativistic images. Standard lensing and retrolensing situations are analyzed in a unified setting, and the results are compared with those corresponding to the Schw... |
2207.04740 | Michal Marvan | Michal Marvan | Matching van Stockum dust to Papapetrou vacuum | 13 pages, 1 figure. New in version 2: Sections 4, 8, 9, 10 | J. Geom. Phys. 190 (2023) 104878 | 10.1016/j.geomphys.2023.104878 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Addressing a long-standing problem, we show that every van Stockum dust can
be matched to a 1-parametric family of non-static Papapetrou vacuum metrics,
and the converse. The boundary, if existing, is determined by vanishing of
certain first-order invariant on the vacuum side. Moreover, we establish a
relation to Ehl... | [
{
"created": "Mon, 11 Jul 2022 09:50:37 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Mar 2023 09:27:44 GMT",
"version": "v2"
}
] | 2024-03-21 | [
[
"Marvan",
"Michal",
""
]
] | Addressing a long-standing problem, we show that every van Stockum dust can be matched to a 1-parametric family of non-static Papapetrou vacuum metrics, and the converse. The boundary, if existing, is determined by vanishing of certain first-order invariant on the vacuum side. Moreover, we establish a relation to Ehler... |
0911.2391 | Richard Dowdall Mr | R.J. Dowdall | Wilson loops, geometric operators and fermions in 3d group field theory | 13 pages, many figures, uses psfrag | Central Eur.J.Phys.9:1043-1056,2011 | 10.2478/s11534-010-0137-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Group field theories whose Feynman diagrams describe 3d gravity with a
varying configuration of Wilson loop observables and 3d gravity with volume
observables at each vertex are defined. The volume observables are created by
the usual spin network grasping operators which require the introduction of
vector fields on ... | [
{
"created": "Thu, 12 Nov 2009 13:51:01 GMT",
"version": "v1"
}
] | 2011-05-19 | [
[
"Dowdall",
"R. J.",
""
]
] | Group field theories whose Feynman diagrams describe 3d gravity with a varying configuration of Wilson loop observables and 3d gravity with volume observables at each vertex are defined. The volume observables are created by the usual spin network grasping operators which require the introduction of vector fields on th... |
1907.11763 | Pablo Le\'on | P. Le\'on and A. Sotomayor | Braneworld Gravity under gravitational decoupling | 17 pages, 14 figures | null | 10.1002/prop.201900077 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main objective of this work is to study in some detail the
Randall-Sundrum gravity under the gravitational decoupling through the minimal
geometric deformation approach (MGD-decoupling). We show a family of new black
hole solutions as well as new exact interior solutions for self-gravitating
stellar systems and w... | [
{
"created": "Fri, 26 Jul 2019 19:34:07 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Sep 2019 19:34:21 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Aug 2020 23:21:01 GMT",
"version": "v3"
}
] | 2020-08-21 | [
[
"León",
"P.",
""
],
[
"Sotomayor",
"A.",
""
]
] | The main objective of this work is to study in some detail the Randall-Sundrum gravity under the gravitational decoupling through the minimal geometric deformation approach (MGD-decoupling). We show a family of new black hole solutions as well as new exact interior solutions for self-gravitating stellar systems and we ... |
gr-qc/9410013 | Jesus Barbero | J. Fernando Barbero | Reality Conditions and Ashtekar Variables: a Different Perspective | 22 pages, LATEX, Preprint CGPG-94/10-2 | Phys.Rev.D51:5498-5506,1995 | 10.1103/PhysRevD.51.5498 | null | gr-qc | null | We give in this paper a modified self-dual action that leads to the
$SO(3)$-ADM formalism without having to face the difficult second class
constraints present in other approaches (for example if one starts from the
Hilbert-Palatini action). We use the new action principle to gain some new
insights into the problem o... | [
{
"created": "Tue, 11 Oct 1994 21:45:03 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Barbero",
"J. Fernando",
""
]
] | We give in this paper a modified self-dual action that leads to the $SO(3)$-ADM formalism without having to face the difficult second class constraints present in other approaches (for example if one starts from the Hilbert-Palatini action). We use the new action principle to gain some new insights into the problem of ... |
gr-qc/9711024 | George Lavrelashvili | Peter Breitenlohner, George Lavrelashvili, and Dieter Maison | Mass inflation inside non-Abelian black holes | 4 pages, LaTex (mprocl.sty included), contains 4 eps files combined
in 2 figures. To appear in the proceedings of the Eighth Marcel Grossmann
Meeting, Jerusalem, June 1997. LaTex problems are fixed in the replaced
version, no other changes | null | null | null | gr-qc | null | The interior geometry of static, spherically symmetric black holes of the
Einstein-Yang-Mills-Higgs theory is analyzed. It is found that in contrast to
the Abelian case generically no inner (Cauchy) horizon is formed inside
non-Abelian black holes. Instead the solutions come close to a Cauchy horizon
but then undergo... | [
{
"created": "Thu, 6 Nov 1997 19:14:31 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 1997 14:39:36 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Breitenlohner",
"Peter",
""
],
[
"Lavrelashvili",
"George",
""
],
[
"Maison",
"Dieter",
""
]
] | The interior geometry of static, spherically symmetric black holes of the Einstein-Yang-Mills-Higgs theory is analyzed. It is found that in contrast to the Abelian case generically no inner (Cauchy) horizon is formed inside non-Abelian black holes. Instead the solutions come close to a Cauchy horizon but then undergo a... |
gr-qc/0608046 | Guihua Tian | Tian Gui-hua, Zhao Zheng, Shi-kun Wang | The effect of the tortoise coordinates on the tunnel effect | null | null | null | null | gr-qc | null | The tunnel process of the quantum wave from the light cone is carefully
discussed. They are applied in the massive quantum particles from the
Schwarzschild black hole in the Kruskal metric. The tortoise coordinates
prevent one from understanding the tunnel process, and are investigated with
care. Furthermore, the mas... | [
{
"created": "Wed, 9 Aug 2006 09:42:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gui-hua",
"Tian",
""
],
[
"Zheng",
"Zhao",
""
],
[
"Wang",
"Shi-kun",
""
]
] | The tunnel process of the quantum wave from the light cone is carefully discussed. They are applied in the massive quantum particles from the Schwarzschild black hole in the Kruskal metric. The tortoise coordinates prevent one from understanding the tunnel process, and are investigated with care. Furthermore, the massi... |
1901.06969 | Nikolaos Stergioulas | Andreas Bauswein and Nikolaos Stergioulas | Spectral classification of gravitational-wave emission and equation of
state constraints in binary neutron star mergers | Matches published version in focus issue on 'Hadrons & Gravitational
Waves After GW170817', Journal of Physics G: Nuclear and Particle Physics, 44
pages, 13 figures, 171 references | J. Phys. G: Nucl. Part. Phys. 46 113002 (2019) | 10.1088/1361-6471/ab2b90 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first detection of gravitational waves from a binary neutron star merger
(GW170817) and the accompanying electromagnetic emission has impressively
advanced our understanding of the merger process and has set some first
constraints on the macroscopic properties of neutron stars, with direct
implications for the hi... | [
{
"created": "Mon, 21 Jan 2019 15:37:19 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2020 17:43:17 GMT",
"version": "v2"
}
] | 2020-02-05 | [
[
"Bauswein",
"Andreas",
""
],
[
"Stergioulas",
"Nikolaos",
""
]
] | The first detection of gravitational waves from a binary neutron star merger (GW170817) and the accompanying electromagnetic emission has impressively advanced our understanding of the merger process and has set some first constraints on the macroscopic properties of neutron stars, with direct implications for the high... |
1909.01880 | Wolfgang Muschik | Wolfgang Muschik | Covariant Relativistic Non-Equilibrium Thermodynamics of Multi-Component
Systems | 49 pages, Research paper. arXiv admin note: substantial text overlap
with arXiv:1806.01648, arXiv:1701.04103 | null | 10.3390/e21111034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-equilibrium and equilibrium thermodynamics of an interacting component in
a relativistic multi-component system is discussed covariantly by exploiting an
entropy identity. The special case of the corresponding free component is
considered. Equilibrium conditions and especially the multi-component Killing
relation... | [
{
"created": "Tue, 3 Sep 2019 11:52:01 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Muschik",
"Wolfgang",
""
]
] | Non-equilibrium and equilibrium thermodynamics of an interacting component in a relativistic multi-component system is discussed covariantly by exploiting an entropy identity. The special case of the corresponding free component is considered. Equilibrium conditions and especially the multi-component Killing relation o... |
gr-qc/0201101 | Luiz Paulo Colatto | M.E.X. Guimaraes, L.P. Colatto and F.B. Tourinho | On the Weak-Field Approximation in Generalized Scalar-Tensor Gravities | null | Spacetime and Substance 2 (2001) 71-74 | null | null | gr-qc | null | In the paper published in Phys. Lett. A245} (1998) 31, Barros and Romero
demonstrated that, in the weak-field approximation, solutions to the
Brans-Dicke equations are related to the solutions of General Relativity for
the same matter distributions. In the present work, we enphasize this result
and we extend it to fo... | [
{
"created": "Thu, 31 Jan 2002 13:56:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Guimaraes",
"M. E. X.",
""
],
[
"Colatto",
"L. P.",
""
],
[
"Tourinho",
"F. B.",
""
]
] | In the paper published in Phys. Lett. A245} (1998) 31, Barros and Romero demonstrated that, in the weak-field approximation, solutions to the Brans-Dicke equations are related to the solutions of General Relativity for the same matter distributions. In the present work, we enphasize this result and we extend it to for ... |
0908.1165 | Salvador Robles-Perez | Pedro F. Gonz\'alez-D\'iaz and Salvador Robles-P\'erez | The entangled accelerating universe | null | Phys.Lett.B679:298-301,2009 | 10.1016/j.physletb.2009.08.006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the known result that the nucleation of baby universes in correlated
pairs is equivalent to spacetime squeezing, we show in this letter that there
exists a T-duality symmetry between two-dimensional warp drives, which are
physically expressible as localized de Sitter little universes, and two
dimensional Tolman... | [
{
"created": "Sat, 8 Aug 2009 12:08:16 GMT",
"version": "v1"
}
] | 2010-03-25 | [
[
"González-Díaz",
"Pedro F.",
""
],
[
"Robles-Pérez",
"Salvador",
""
]
] | Using the known result that the nucleation of baby universes in correlated pairs is equivalent to spacetime squeezing, we show in this letter that there exists a T-duality symmetry between two-dimensional warp drives, which are physically expressible as localized de Sitter little universes, and two dimensional Tolman-H... |
gr-qc/0105032 | josep M. Pons | J. M. Pons | Boundary conditions from boundary terms, Noether charges and the trace K
lagrangian in general relativity | 24 pages, some references added and a new paragraph in the
conclusions | Gen.Rel.Grav.35:147-174,2003 | 10.1023/A:1022329007805 | null | gr-qc hep-th math-ph math.MP | null | We present the Lagrangian whose corresponding action is the trace K action
for General Relativity. Although this Lagrangian is second order in the
derivatives, it has no second order time derivatives and its behaviour at space
infinity in the asymptotically flat case is identical to other alternative
Lagrangians for ... | [
{
"created": "Wed, 9 May 2001 08:40:36 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2001 11:08:21 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Mar 2002 08:42:17 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Pons",
"J. M.",
""
]
] | We present the Lagrangian whose corresponding action is the trace K action for General Relativity. Although this Lagrangian is second order in the derivatives, it has no second order time derivatives and its behaviour at space infinity in the asymptotically flat case is identical to other alternative Lagrangians for Ge... |
0910.3734 | Gonzalo Olmo | Gonzalo J. Olmo | New Phenomenology for Palatini f(R) Theories: Non-singular Universes | 8 pages, 3 figures. Talk given at "The Invisible Universe
International Conference", Paris, France, June 29-July 3, 2009; added
references | AIP Conf.Proc.1241:1100-1107,2010 | 10.1063/1.3462606 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study modified theories of gravity of the f(R) type in Palatini formalism.
We first consider the stability of atoms when the Palatini gravitational
interaction is taken into account in the derivation of the non-relativistic
Schrodinger equation. We show that theories with infrared curvature corrections
are ruled o... | [
{
"created": "Tue, 20 Oct 2009 03:32:08 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Oct 2009 16:30:36 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Olmo",
"Gonzalo J.",
""
]
] | We study modified theories of gravity of the f(R) type in Palatini formalism. We first consider the stability of atoms when the Palatini gravitational interaction is taken into account in the derivation of the non-relativistic Schrodinger equation. We show that theories with infrared curvature corrections are ruled out... |
2105.13388 | Job Furtado Neto | J. Furtado, J. F. Assun\c{c}\~ao, C. R. Muniz | Relativistic Bose-Einstein condensate in the rainbow gravity | 13 pages, 2 figure, matches version accepted in EPL | EPL 139 29001 (2022) | 10.1209/0295-5075/ac7f51 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study the effects of a modified theory of gravity - the
rainbow gravity - on the relativistic Bose-Einstein condensate (BEC). We
initially discuss some formal aspects of the model in order to compute the
corrections to the relevant quantities of the condensate. Following, we
evaluate the generating ... | [
{
"created": "Thu, 27 May 2021 18:33:02 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2022 22:12:26 GMT",
"version": "v2"
}
] | 2022-09-23 | [
[
"Furtado",
"J.",
""
],
[
"Assunção",
"J. F.",
""
],
[
"Muniz",
"C. R.",
""
]
] | In this paper, we study the effects of a modified theory of gravity - the rainbow gravity - on the relativistic Bose-Einstein condensate (BEC). We initially discuss some formal aspects of the model in order to compute the corrections to the relevant quantities of the condensate. Following, we evaluate the generating fu... |
2103.12786 | Teodor Borislavov Vasilev | Teodor Borislavov Vasilev, Mariam Bouhmadi-L\'opez and Prado
Mart\'in-Moruno | The little rip in classical and quantum $f(R)$ cosmology | 14 pages. v2: typos fixed, references added, matches published
version | Phys. Rev. D 103, 124049 (2021) | 10.1103/PhysRevD.103.124049 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The little rip is a cosmological abrupt event predicted by some phantom dark
energy models that could describe the future evolution of our Universe. This
event can be interpreted as a big rip singularity delayed indefinitely,
although in those models bounded structures will be destroyed in a finite
cosmic time in the... | [
{
"created": "Tue, 23 Mar 2021 18:32:45 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jun 2021 18:13:04 GMT",
"version": "v2"
}
] | 2021-06-25 | [
[
"Vasilev",
"Teodor Borislavov",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Martín-Moruno",
"Prado",
""
]
] | The little rip is a cosmological abrupt event predicted by some phantom dark energy models that could describe the future evolution of our Universe. This event can be interpreted as a big rip singularity delayed indefinitely, although in those models bounded structures will be destroyed in a finite cosmic time in the f... |
2105.14702 | Yifeng Zou | Yi-Feng Zou, Jun-Huai Xu, Zhan-Feng Mai, Jia-Hui Huang | Dyonic Reissner-Nordstrom Black Holes and Superradiant Stability | null | null | 10.1140/epjc/s10052-021-09642-3 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Black holes immersed in magnetic fields are believed to be important systems
in astrophysics. One interesting topic on these systems is their superradiant
stability property. In the present paper, we analytically obtain the
superradiantly stable regime for the asymptotically flat dyonic
Reissner-Nordstrom black holes... | [
{
"created": "Mon, 31 May 2021 04:47:32 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jul 2021 03:11:41 GMT",
"version": "v2"
}
] | 2021-10-04 | [
[
"Zou",
"Yi-Feng",
""
],
[
"Xu",
"Jun-Huai",
""
],
[
"Mai",
"Zhan-Feng",
""
],
[
"Huang",
"Jia-Hui",
""
]
] | Black holes immersed in magnetic fields are believed to be important systems in astrophysics. One interesting topic on these systems is their superradiant stability property. In the present paper, we analytically obtain the superradiantly stable regime for the asymptotically flat dyonic Reissner-Nordstrom black holes w... |
gr-qc/0102002 | Viorel Drafta | Viorel Drafta | Proposal for experimental verifying of Machian transient mass
fluctuations | 14 pages, 3 figures | null | null | null | gr-qc | null | Starting from quoted papers it show that, applying Mach's principle, on
obtains transient mass fluctuation by varying proper energy. It is show why the
experiments performed until now measured a smaller effect than was predicted.
On establish conditions for using gravitational energy by means of transient
mass fluctu... | [
{
"created": "Thu, 1 Feb 2001 13:34:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Drafta",
"Viorel",
""
]
] | Starting from quoted papers it show that, applying Mach's principle, on obtains transient mass fluctuation by varying proper energy. It is show why the experiments performed until now measured a smaller effect than was predicted. On establish conditions for using gravitational energy by means of transient mass fluctuat... |
1605.00924 | Behnam Pourhassan | Behnam Pourhassan, Mir Faizal | Effect of Thermal Fluctuations on a Charged Dilatonic Black Saturn | null | Phys. Lett. B755 (2016) 444 | 10.1016/j.physletb.2016.02.043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will analyze the effect of thermal fluctuations on the
thermodynamics of a charged dilatonic black Saturn. These thermal fluctuations
will correct the thermodynamics of the charged dilatonic black Saturn. We will
analyze the corrections to the thermodynamics of this system by first relating
the fluc... | [
{
"created": "Sun, 1 May 2016 06:27:58 GMT",
"version": "v1"
}
] | 2016-05-18 | [
[
"Pourhassan",
"Behnam",
""
],
[
"Faizal",
"Mir",
""
]
] | In this paper, we will analyze the effect of thermal fluctuations on the thermodynamics of a charged dilatonic black Saturn. These thermal fluctuations will correct the thermodynamics of the charged dilatonic black Saturn. We will analyze the corrections to the thermodynamics of this system by first relating the fluctu... |
1107.5725 | Chris Messenger | Chris Messenger, Jocelyn Read | Measuring a cosmological distance-redshift relationship using only
gravitational wave observations of binary neutron star coalescences | 5 pages, 1 figure, submitted to Phys. Rev. Lett | null | 10.1103/PhysRevLett.108.091101 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detection of gravitational waves from the inspiral phase of binary neutron
star coalescence will allow us to measure the effects of the tidal coupling in
such systems. These effects will be measurable using 3rd generation
gravitational wave detectors, e.g. the Einstein Telescope, which will be
capable of detecting in... | [
{
"created": "Thu, 28 Jul 2011 14:34:56 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 2011 11:20:01 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Messenger",
"Chris",
""
],
[
"Read",
"Jocelyn",
""
]
] | Detection of gravitational waves from the inspiral phase of binary neutron star coalescence will allow us to measure the effects of the tidal coupling in such systems. These effects will be measurable using 3rd generation gravitational wave detectors, e.g. the Einstein Telescope, which will be capable of detecting insp... |
1612.04184 | David Garfinkle | David Garfinkle | Matters of Gravity, The Newsletter of the Division of Gravitational
Physics of the American Physical Society, Volume 48, December 2016 | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | DGRAV News: we hear that ...
DGRAV program at the APS meeting in Washington D.C.
Obituary:
Remembering John Stewart
Conference Reports:
CPT and Lorentz Symmetry
| [
{
"created": "Sat, 10 Dec 2016 19:25:49 GMT",
"version": "v1"
}
] | 2016-12-14 | [
[
"Garfinkle",
"David",
""
]
] | DGRAV News: we hear that ... DGRAV program at the APS meeting in Washington D.C. Obituary: Remembering John Stewart Conference Reports: CPT and Lorentz Symmetry |
2209.06237 | Pedro V. P. Cunha | Ivo Sengo, Pedro V.P. Cunha, Carlos A. R. Herdeiro, Eugen Radu | Kerr black holes with synchronised Proca hair: lensing, shadows and EHT
constraints | 36 pages, 20 figures + appendix | null | 10.1088/1475-7516/2023/01/047 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the gravitational lensing by spinning Proca stars and the
shadows and lensing by Kerr black holes (BHs) with synchronised Proca hair,
discussing both theoretical aspects and observational constraints from the
Event Horizon Telescope (EHT) M87* and Sgr A* data. On the theoretical side,
this family of BH... | [
{
"created": "Tue, 13 Sep 2022 18:01:07 GMT",
"version": "v1"
}
] | 2023-02-08 | [
[
"Sengo",
"Ivo",
""
],
[
"Cunha",
"Pedro V. P.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Radu",
"Eugen",
""
]
] | We investigate the gravitational lensing by spinning Proca stars and the shadows and lensing by Kerr black holes (BHs) with synchronised Proca hair, discussing both theoretical aspects and observational constraints from the Event Horizon Telescope (EHT) M87* and Sgr A* data. On the theoretical side, this family of BHs ... |
2212.00933 | Cong Zhang | Cong Zhang, Hongguang Liu and Muxin Han | Fermions in Loop Quantum Gravity and Resolution of Doubling Problem | 25+9 pages, 2 figures | Class. Quantum Grav. 40 (2023) 205022 | 10.1088/1361-6382/acf26b | null | gr-qc hep-lat hep-th | http://creativecommons.org/licenses/by/4.0/ | The fermion propagator is derived in detail from the model of fermion coupled
to loop quantum gravity. As an ingredient of the propagator, the vacuum state
is defined as the ground state of some effective fermion Hamiltonian under the
background geometry given by a coherent state resembling the classical
Minkowski sp... | [
{
"created": "Fri, 2 Dec 2022 02:30:13 GMT",
"version": "v1"
}
] | 2023-11-14 | [
[
"Zhang",
"Cong",
""
],
[
"Liu",
"Hongguang",
""
],
[
"Han",
"Muxin",
""
]
] | The fermion propagator is derived in detail from the model of fermion coupled to loop quantum gravity. As an ingredient of the propagator, the vacuum state is defined as the ground state of some effective fermion Hamiltonian under the background geometry given by a coherent state resembling the classical Minkowski spac... |
1703.07787 | Francesco Torsello | Francesco Torsello, Mikica Kocic, Edvard Mortsell | Classification and asymptotic structure of black holes in bimetric
theory | 38 pages, 15 figures. It matches with the published version | Phys. Rev. D 96, 064003 (2017) | 10.1103/PhysRevD.96.064003 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study general properties of static and spherically symmetric bidiagonal
black holes in Hassan-Rosen bimetric theory. In particular, we explore the
behaviour of the black hole solutions both at the common Killing horizon and at
the large radii. The former study leads to a new classification for black holes
within t... | [
{
"created": "Wed, 22 Mar 2017 18:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2017 09:12:19 GMT",
"version": "v2"
}
] | 2017-09-08 | [
[
"Torsello",
"Francesco",
""
],
[
"Kocic",
"Mikica",
""
],
[
"Mortsell",
"Edvard",
""
]
] | We study general properties of static and spherically symmetric bidiagonal black holes in Hassan-Rosen bimetric theory. In particular, we explore the behaviour of the black hole solutions both at the common Killing horizon and at the large radii. The former study leads to a new classification for black holes within the... |
gr-qc/0612162 | Mario La Camera | M. La Camera | Brane cosmology with R_(4) term in the bulk | 15 pages, to appear in Acta Phys. Pol. B | Acta Phys.Polon.B39:1795-1809,2008 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider brane cosmology when the 4D Ricci scalar term is added to the 5D
Einstein-Hilbert action and discuss the role that the addition of this term has
on the brane-bulk system. The induced brane dynamics is shown to be the usual
Einstein dynamics coupled to a modified energy-momentum tensor which is well
define... | [
{
"created": "Wed, 27 Dec 2006 16:30:34 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 2007 16:58:03 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Mar 2008 10:30:26 GMT",
"version": "v3"
},
{
"created": "Fri, 18 Jul 2008 15:37:23 GMT",
"version": "v4"
}
] | 2008-12-19 | [
[
"La Camera",
"M.",
""
]
] | We consider brane cosmology when the 4D Ricci scalar term is added to the 5D Einstein-Hilbert action and discuss the role that the addition of this term has on the brane-bulk system. The induced brane dynamics is shown to be the usual Einstein dynamics coupled to a modified energy-momentum tensor which is well defined ... |
2305.12980 | Tomasz Smo{\l}ka | Piotr T. Chru\'sciel and Tomasz Smo{\l}ka | Hamiltonian charges on light cones for linear field theories on (A)dS
backgrounds | 79 pages, 1 figure | null | null | UWThPh-2023-7 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the Noether charges for scalar and Maxwell fields on light cones
on a de Sitter, Minkowski, and anti-de Sitter backgrounds. Somewhat
surprisingly, under natural asymptotic conditions all charges for the Maxwell
fields on both the de Sitter and anti-de Sitter backgrounds are finite. On the
other hand, one n... | [
{
"created": "Mon, 22 May 2023 12:40:45 GMT",
"version": "v1"
}
] | 2023-05-23 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Smołka",
"Tomasz",
""
]
] | We analyse the Noether charges for scalar and Maxwell fields on light cones on a de Sitter, Minkowski, and anti-de Sitter backgrounds. Somewhat surprisingly, under natural asymptotic conditions all charges for the Maxwell fields on both the de Sitter and anti-de Sitter backgrounds are finite. On the other hand, one nee... |
gr-qc/0303009 | Elias C. Vagenas | Elias C. Vagenas | Energy Distribution in 2d Stringy Black Hole Backgrounds | 17 pages, LaTeX, v2: acknowledgements added, to appear in
Int.J.Mod.Phys.A | Int.J.Mod.Phys. A18 (2003) 5781-5794 | 10.1142/S0217751X03015969 | UB-ECM-PF-03/07 | gr-qc astro-ph hep-th | null | We utilize Moller's and Einstein's energy-momentum complexes in order to
explicitly evaluate the energy distributions associated with the
two-dimensional "Schwarzschild" and "Reissner-Nordstrom" black hole
backgrounds. While Moller's prescription provides meaningful physical results,
Einstein's prescription fails to ... | [
{
"created": "Mon, 3 Mar 2003 11:20:19 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 2003 14:24:35 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Vagenas",
"Elias C.",
""
]
] | We utilize Moller's and Einstein's energy-momentum complexes in order to explicitly evaluate the energy distributions associated with the two-dimensional "Schwarzschild" and "Reissner-Nordstrom" black hole backgrounds. While Moller's prescription provides meaningful physical results, Einstein's prescription fails to do... |
1609.05613 | Etienne Takou | Etienne Takou, Fidele L. Ciake Ciake | Inhomogeneous relativistic Boltzmann equation near vacuum in the
Robertson-Walker space-time | the paper will appear at Annales de l'Institut Fourier | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we consider the Cauchy problem for the relativistic Boltzmann
equation with near vacuum initial data where the distribution function depends
on the time, the position and the impulsion. The collision kernel considered
here is for the hard potentials case and the background space-time in which the
study... | [
{
"created": "Mon, 19 Sep 2016 07:10:16 GMT",
"version": "v1"
}
] | 2016-09-20 | [
[
"Takou",
"Etienne",
""
],
[
"Ciake",
"Fidele L. Ciake",
""
]
] | In this paper, we consider the Cauchy problem for the relativistic Boltzmann equation with near vacuum initial data where the distribution function depends on the time, the position and the impulsion. The collision kernel considered here is for the hard potentials case and the background space-time in which the study i... |
1606.01571 | Ichiro Oda | Ichiro Oda | Fake Conformal Symmetry in Unimodular Gravity | 13 pages | Phys. Rev. D 94, 044032 (2016) | 10.1103/PhysRevD.94.044032 | DPUR/TH/49 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Weyl symmetry (local conformal symmetry) in unimodular gravity. It
is shown that the Noether currents for both Weyl symmetry and global scale
symmetry, identically vanish as in the conformally invariant scalar-tensor
gravity. We clearly explain why in the class of conformally invariant
gravitational theories... | [
{
"created": "Sun, 5 Jun 2016 22:10:36 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Oda",
"Ichiro",
""
]
] | We study Weyl symmetry (local conformal symmetry) in unimodular gravity. It is shown that the Noether currents for both Weyl symmetry and global scale symmetry, identically vanish as in the conformally invariant scalar-tensor gravity. We clearly explain why in the class of conformally invariant gravitational theories, ... |
0709.0076 | Hanno Sahlmann | Hanno Sahlmann | Entropy calculation for a toy black hole | 18 pages, 4 figures. v2: Corrected mistake in bibliography, added
appendix with further results | Class.Quant.Grav.25:055004,2008 | 10.1088/0264-9381/25/5/055004 | ITP-UU-07/45, SPIN-07/33 | gr-qc hep-th math-ph math.MP | null | In this note we carry out the counting of states for a black hole in loop
quantum gravity, however assuming an equidistant area spectrum. We find that
this toy-model is exactly solvable, and we show that its behavior is very
similar to that of the correct model. Thus this toy-model can be used as a nice
and simplifyi... | [
{
"created": "Sun, 2 Sep 2007 10:39:00 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Sep 2007 18:16:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sahlmann",
"Hanno",
""
]
] | In this note we carry out the counting of states for a black hole in loop quantum gravity, however assuming an equidistant area spectrum. We find that this toy-model is exactly solvable, and we show that its behavior is very similar to that of the correct model. Thus this toy-model can be used as a nice and simplifying... |
gr-qc/0510047 | Matteo Luca Ruggiero | Matteo Luca Ruggiero | The Sagnac Effect in curved space-times from an analogy with the
Aharonov-Bohm Effect | 14 pages, 1 EPS figure, LaTeX, accepted for publication in General
Relativity and Gravitation | Gen.Rel.Grav. 37 (2005) 1845-1855 | 10.1007/s10714-005-0190-0 | null | gr-qc | null | In the context of the natural splitting, the standard relative dynamics can
be expressed in terms of gravito-electromagnetic fields, which allow to
formally introduce a gravito-magnetic Aharonov-Bohm effect. We showed elsewhere
that this formal analogy can be used to derive the Sagnac effect in flat
space-time as a g... | [
{
"created": "Mon, 10 Oct 2005 14:07:19 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2005 16:27:50 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ruggiero",
"Matteo Luca",
""
]
] | In the context of the natural splitting, the standard relative dynamics can be expressed in terms of gravito-electromagnetic fields, which allow to formally introduce a gravito-magnetic Aharonov-Bohm effect. We showed elsewhere that this formal analogy can be used to derive the Sagnac effect in flat space-time as a gra... |
2208.14811 | Alexei M. Frolov | Alexei M. Frolov | Metric gravity in the Hamiltonian form. Canonical transformations.
Dirac's modifications of the Hamilton method and integral invariants of the
metric gravity | now it is ready for submission | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two different Hamiltonian formulations of the metric gravity are discussed
and applied to describe a free gravitational field in the $d$ dimensional
Riemann space-time. Theory of canonical transformations, which relate
equivalent Hamiltonian formulations of the metric gravity, is investigated in
details. In particula... | [
{
"created": "Mon, 29 Aug 2022 23:39:38 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Sep 2022 04:18:15 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Sep 2022 09:25:34 GMT",
"version": "v3"
},
{
"created": "Tue, 20 Sep 2022 00:09:02 GMT",
"version": "v4"
}
] | 2022-09-21 | [
[
"Frolov",
"Alexei M.",
""
]
] | Two different Hamiltonian formulations of the metric gravity are discussed and applied to describe a free gravitational field in the $d$ dimensional Riemann space-time. Theory of canonical transformations, which relate equivalent Hamiltonian formulations of the metric gravity, is investigated in details. In particular,... |
1902.03895 | Christian Corda Prof. | Elmo Benedetto, Fabiano Feleppa, Ignazio Licata, Hooman Moradpour and
Christian Corda | On the general relativistic framework of the Sagnac effect | 9 pages, to appear in the European Physical Journal C | Eur. Phys. J. C 79, 187 (2019) | 10.1140/epjc/s10052-019-6692-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Sagnac effect is usually considered as being a relativistic effect
produced in an interferometer when the device is rotating. General relativistic
explanations are known and already widely explained in many papers. Such
general relativistic approaches are founded on Einstein's equivalence principle
(EEP), which s... | [
{
"created": "Mon, 11 Feb 2019 16:47:08 GMT",
"version": "v1"
}
] | 2019-04-19 | [
[
"Benedetto",
"Elmo",
""
],
[
"Feleppa",
"Fabiano",
""
],
[
"Licata",
"Ignazio",
""
],
[
"Moradpour",
"Hooman",
""
],
[
"Corda",
"Christian",
""
]
] | The Sagnac effect is usually considered as being a relativistic effect produced in an interferometer when the device is rotating. General relativistic explanations are known and already widely explained in many papers. Such general relativistic approaches are founded on Einstein's equivalence principle (EEP), which sta... |
1702.01170 | Mario Llerena | Ericsson L\'opez, Mario Llerena | Cosmological Redshift in a Bianchi I Axisymmetric Model: A Qualitative
Analysis | in Spanish | Revista Polit\'ecnica, Enero 2017, Vol. 38, No. 2 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic Microwave Background anomalies suggest that the Universe is slightly
anisotropic, so a Cosmological Model that does not satisfy the Cosmological
Principle is necessary. Anisotropic Bianchi models have been studied given that
they would be necessary to understand the early stages of the Universe. In this
paper,... | [
{
"created": "Fri, 3 Feb 2017 21:31:43 GMT",
"version": "v1"
}
] | 2017-02-07 | [
[
"López",
"Ericsson",
""
],
[
"Llerena",
"Mario",
""
]
] | Cosmic Microwave Background anomalies suggest that the Universe is slightly anisotropic, so a Cosmological Model that does not satisfy the Cosmological Principle is necessary. Anisotropic Bianchi models have been studied given that they would be necessary to understand the early stages of the Universe. In this paper, w... |
1508.00939 | Don Marolf | Donald Marolf | Comments on Microcausality, Chaos, and Gravitational Observables | 16 pages, 1 figure; references added | null | 10.1088/0264-9381/32/24/245003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observables in gravitational systems must be non-local so as to be invariant
under diffeomorphism gauge transformations. But at the classical level some
such observables can nevertheless satisfy an exact form of microcausality. This
property is conjectured to remain true at all orders in the semiclassical
expansion, ... | [
{
"created": "Tue, 4 Aug 2015 23:42:40 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2015 22:08:24 GMT",
"version": "v2"
}
] | 2015-12-16 | [
[
"Marolf",
"Donald",
""
]
] | Observables in gravitational systems must be non-local so as to be invariant under diffeomorphism gauge transformations. But at the classical level some such observables can nevertheless satisfy an exact form of microcausality. This property is conjectured to remain true at all orders in the semiclassical expansion, th... |
gr-qc/0412102 | Salvatore Antoci | S. Antoci, D.-E. Liebscher, L. Mihich | The physical meaning of the "boost-rotation symmetric" solutions within
the general interpretation of Einstein's theory of gravitation | 9 pages, 1 figure; text to appear in General Relativity and
Gravitation | Gen.Rel.Grav. 38 (2006) 15-22 | 10.1007/s10714-005-0206-9 | null | gr-qc | null | The answer to the question, what physical meaning should be attributed to the
so-called boost-rotation symmetric exact solutions to the field equations of
general relativity, is provided within the general interpretation scheme for
the ``theories of relativity'', based on group theoretical arguments, and set
forth by... | [
{
"created": "Tue, 21 Dec 2004 14:14:13 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2005 09:28:21 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Antoci",
"S.",
""
],
[
"Liebscher",
"D. -E.",
""
],
[
"Mihich",
"L.",
""
]
] | The answer to the question, what physical meaning should be attributed to the so-called boost-rotation symmetric exact solutions to the field equations of general relativity, is provided within the general interpretation scheme for the ``theories of relativity'', based on group theoretical arguments, and set forth by E... |
1309.1699 | Ignazio Ciufolini | Ignazio Ciufolini, Antonio Paolozzi, Rolf Koenig, Erricos C. Pavlis,
John Ries, Richard Matzner, Vahe Gurzadyan, Roger Penrose, Giampiero Sindoni
and Claudio Paris | Fundamental Physics and General Relativity with the LARES and LAGEOS
satellites | To be publihed in Nuclear Physics. arXiv admin note: substantial text
overlap with arXiv:1306.1826, arXiv:1211.1374 | null | 10.1016/j.nuclphysbps.2013.09.005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current observations of the universe have strengthened the interest to
further test General Relativity and other theories of fundamental physics.
After an introduction to the phenomenon of frame-dragging predicted by
Einstein's theory of General Relativity, with fundamental astrophysical
applications to rotating blac... | [
{
"created": "Thu, 5 Sep 2013 09:39:56 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Ciufolini",
"Ignazio",
""
],
[
"Paolozzi",
"Antonio",
""
],
[
"Koenig",
"Rolf",
""
],
[
"Pavlis",
"Erricos C.",
""
],
[
"Ries",
"John",
""
],
[
"Matzner",
"Richard",
""
],
[
"Gurzadyan",
"Vahe",
""
],
... | Current observations of the universe have strengthened the interest to further test General Relativity and other theories of fundamental physics. After an introduction to the phenomenon of frame-dragging predicted by Einstein's theory of General Relativity, with fundamental astrophysical applications to rotating black ... |
2212.10962 | Christian R\"oken | Christian R\"oken | A Quasi-local, Functional Analytic Detection Method for Stationary Limit
Surfaces of Black Hole Spacetimes | 11 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a quasi-local, functional analytic method to locate and
invariantly characterize the stationary limit surfaces of black hole spacetimes
with stationary regions. The method is based on ellipticity-hyperbolicity
transitions of the Dirac, Klein-Gordon, Maxwell, and Fierz-Pauli Hamiltonians
defined on spacelik... | [
{
"created": "Wed, 21 Dec 2022 12:07:29 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2024 09:21:53 GMT",
"version": "v2"
}
] | 2024-02-23 | [
[
"Röken",
"Christian",
""
]
] | We present a quasi-local, functional analytic method to locate and invariantly characterize the stationary limit surfaces of black hole spacetimes with stationary regions. The method is based on ellipticity-hyperbolicity transitions of the Dirac, Klein-Gordon, Maxwell, and Fierz-Pauli Hamiltonians defined on spacelike ... |
2207.09945 | Pardyumn Kumar Sahoo | Zinnat Hassan, Sayantan Ghosh, P.K. Sahoo, Kazuharu Bamba | Casimir Wormholes in Modified Symmetric Teleparallel Gravity | Comments are welcome | Eur. Phys. J. C 82, 1116 (2022) | 10.1140/epjc/s10052-022-11107-0 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In recent years there has been a growing interest in the field of Casimir
wormhole. In classical general relativity (GR), it is known that the null
energy condition (NEC) has to be violated to have a wormhole to be stable. The
Casimir effect is an experimentally verified effect that is caused due to the
vacuum field ... | [
{
"created": "Fri, 1 Jul 2022 14:59:08 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2022 14:46:09 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Nov 2022 05:02:53 GMT",
"version": "v3"
}
] | 2022-12-13 | [
[
"Hassan",
"Zinnat",
""
],
[
"Ghosh",
"Sayantan",
""
],
[
"Sahoo",
"P. K.",
""
],
[
"Bamba",
"Kazuharu",
""
]
] | In recent years there has been a growing interest in the field of Casimir wormhole. In classical general relativity (GR), it is known that the null energy condition (NEC) has to be violated to have a wormhole to be stable. The Casimir effect is an experimentally verified effect that is caused due to the vacuum field fl... |
gr-qc/9403052 | Doug | S. P. de Alwis and D. A. MacIntire | The Problem of Time and Quantum Black Holes | 30 pages, COLO-HEP-333 | Phys.Rev.D50:5164-5176,1994 | 10.1103/PhysRevD.50.5164 | null | gr-qc hep-th | null | We discuss the derivation of the so-called semi-classical equations for both
mini-superspace and dilaton gravity. We find that there is no systematic
derivation of a semi-classical theory in which quantum mechanics is formulated
in a space-time that is a solution of Einstein's equation, with the expectation
value of ... | [
{
"created": "Mon, 28 Mar 1994 23:04:58 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"de Alwis",
"S. P.",
""
],
[
"MacIntire",
"D. A.",
""
]
] | We discuss the derivation of the so-called semi-classical equations for both mini-superspace and dilaton gravity. We find that there is no systematic derivation of a semi-classical theory in which quantum mechanics is formulated in a space-time that is a solution of Einstein's equation, with the expectation value of th... |
1403.7217 | Olivier Piguet | Clisthenis P. Constantinidis, Zui Oporto and Olivier Piguet | Loop Quantization of a Model for D=1+2 (Anti)de Sitter Gravity Coupled
to Topological Matter | 18 pages, Latex. Two references added | null | 10.1088/0264-9381/32/5/055007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a complete quantization of Lorentzian D=1+2 gravity with
cosmological constant, coupled to a set of topological matter fields. The
approach of Loop Quantum Gravity is used thanks to a partial gauge fixing
leaving a residual gauge invariance under a compact semi-simple gauge group,
namely Spin(4) = SU(2) x ... | [
{
"created": "Thu, 27 Mar 2014 21:09:31 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2014 14:19:04 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Constantinidis",
"Clisthenis P.",
""
],
[
"Oporto",
"Zui",
""
],
[
"Piguet",
"Olivier",
""
]
] | We present a complete quantization of Lorentzian D=1+2 gravity with cosmological constant, coupled to a set of topological matter fields. The approach of Loop Quantum Gravity is used thanks to a partial gauge fixing leaving a residual gauge invariance under a compact semi-simple gauge group, namely Spin(4) = SU(2) x SU... |
1911.02019 | Hong Lu | H. Lu and Hong-Da Lyu | On the Size of a Black Hole: The Schwarzschild is the Biggest | Latex, 30 pages | Phys. Rev. D 101, 044059 (2020) | 10.1103/PhysRevD.101.044059 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider static black holes in Einstein gravity and study parameters
characterizing the black hole size, namely the radii of the horizon $R_+$,
photon sphere $R_{\rm ph}$ and black hole shadow $R_{\rm sh}$. We find a
sequence of inequalities $\frac32 R_+\, \le\, R_{\rm ph}\, \le
\,\frac{1}{\sqrt3} R_{\rm sh}\,\le\... | [
{
"created": "Tue, 5 Nov 2019 19:00:01 GMT",
"version": "v1"
}
] | 2020-03-04 | [
[
"Lu",
"H.",
""
],
[
"Lyu",
"Hong-Da",
""
]
] | We consider static black holes in Einstein gravity and study parameters characterizing the black hole size, namely the radii of the horizon $R_+$, photon sphere $R_{\rm ph}$ and black hole shadow $R_{\rm sh}$. We find a sequence of inequalities $\frac32 R_+\, \le\, R_{\rm ph}\, \le \,\frac{1}{\sqrt3} R_{\rm sh}\,\le\, ... |
0909.1074 | Cacciatori Sergio | Sergio L. Cacciatori | Conserved quantities for the Sitter particles$^*$ | Talk presented to the XVIII SIGRAV Conference, Cosenza (Italy),
September 22-25, 2008 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent observations of the luminosity-red shift relation of distant type Ia
supernovae established the fact that the expansion of the universe is
accelerated. This is interpreted by saying that there exists some kind of agent
(called dark energy), which exerts an overall repulsive effect on ordinary
matter. Dark ener... | [
{
"created": "Sun, 6 Sep 2009 16:32:38 GMT",
"version": "v1"
}
] | 2009-11-23 | [
[
"Cacciatori",
"Sergio L.",
""
]
] | Recent observations of the luminosity-red shift relation of distant type Ia supernovae established the fact that the expansion of the universe is accelerated. This is interpreted by saying that there exists some kind of agent (called dark energy), which exerts an overall repulsive effect on ordinary matter. Dark energy... |
1611.04995 | Iarley P. Lobo Mr | Iarley P. Lobo, Niccol\'o Loret, Francisco Nettel | Investigation on Finsler geometry as a generalization to curved
spacetime of Planck-scale-deformed relativity in the de Sitter case | 21 pages, 2 figures. Matches version published in PRD | Phys. Rev. D 95, 046015 (2017) | 10.1103/PhysRevD.95.046015 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, Planck-scale modifications to particles' dispersion relation
have been deeply studied for the possibility to formulate some phenomenology of
Planckian effects in astrophysical and cosmological frameworks. There are some
indications [arXiv:gr-qc/0611024] that Finsler geometry can provide some
generali... | [
{
"created": "Tue, 15 Nov 2016 19:23:46 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2016 17:02:43 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Feb 2017 16:16:04 GMT",
"version": "v3"
}
] | 2017-02-24 | [
[
"Lobo",
"Iarley P.",
""
],
[
"Loret",
"Niccoló",
""
],
[
"Nettel",
"Francisco",
""
]
] | In recent years, Planck-scale modifications to particles' dispersion relation have been deeply studied for the possibility to formulate some phenomenology of Planckian effects in astrophysical and cosmological frameworks. There are some indications [arXiv:gr-qc/0611024] that Finsler geometry can provide some generaliza... |
1806.01937 | Massimo Giovannini | Massimo Giovannini | Post-inflationary thermal histories and the refractive index of relic
gravitons | 36 pages, 9 figures | Phys. Rev. D 98, 103509 (2018) | 10.1103/PhysRevD.98.103509 | CERN-TH-2018-122- | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the impact of the post-inflationary thermal histories on the
cosmic graviton spectrum caused by the inflationary variation of their
refractive index. Depending on the frequency band, the spectral energy
distribution can be mildly red, blue or even violet. Wide portions of the
parameter space lead to po... | [
{
"created": "Tue, 5 Jun 2018 21:21:05 GMT",
"version": "v1"
}
] | 2018-11-21 | [
[
"Giovannini",
"Massimo",
""
]
] | We investigate the impact of the post-inflationary thermal histories on the cosmic graviton spectrum caused by the inflationary variation of their refractive index. Depending on the frequency band, the spectral energy distribution can be mildly red, blue or even violet. Wide portions of the parameter space lead to pote... |
1910.01528 | Kota Ogasawara | Kota Ogasawara, Takahisa Igata, Tomohiro Harada, Umpei Miyamoto | Escape probability of a photon emitted near the black hole horizon | 14 pages, 8 figures | Phys. Rev. D 101, 044023 (2020) | 10.1103/PhysRevD.101.044023 | RUP-19-26, KUNS-2795 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the escape of photons from the vicinity of the horizon to
infinity in the Kerr-Newmann black hole spacetime. We assume that a light
source is at rest in a locally nonrotating frame and photons are emitted
isotropically. Then, we evaluate the escape probability of the emitted photons.
The main result of... | [
{
"created": "Thu, 3 Oct 2019 14:39:28 GMT",
"version": "v1"
}
] | 2020-03-05 | [
[
"Ogasawara",
"Kota",
""
],
[
"Igata",
"Takahisa",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Miyamoto",
"Umpei",
""
]
] | We investigate the escape of photons from the vicinity of the horizon to infinity in the Kerr-Newmann black hole spacetime. We assume that a light source is at rest in a locally nonrotating frame and photons are emitted isotropically. Then, we evaluate the escape probability of the emitted photons. The main result of t... |
1612.00860 | Shankar Dayal pathak | S. D. Pathak, M. M. Verma and Shiyuan Li | Thermodynamics of interacting tachyonic scalar field | 05 pages, National Conference on Current Issues in Cosmology,
Astrophysics and High Energy Physics (CICAHEP), Dibrugarh,
http://www.cicahep.org/wp-content/uploads/2016/06/CICAHEP15.107.2.pdf | Proceedings of the National Conference on Current Issues in
Cosmology, Astrophysics and High Energy Physics (CICAHEP), Dibrugarh, India,
November 2 - 5, 2015 | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In this paper we discuss the laws of thermodynamics for interacting tachyonic
scalar field. The components of the tachyonic scalar field in the universe are
taken to exist in the state of non-equilibrium initially, but due to
interaction they undergo a transition towards the equilibrium state. We show
that the zeroth... | [
{
"created": "Wed, 30 Nov 2016 08:11:48 GMT",
"version": "v1"
}
] | 2016-12-06 | [
[
"Pathak",
"S. D.",
""
],
[
"Verma",
"M. M.",
""
],
[
"Li",
"Shiyuan",
""
]
] | In this paper we discuss the laws of thermodynamics for interacting tachyonic scalar field. The components of the tachyonic scalar field in the universe are taken to exist in the state of non-equilibrium initially, but due to interaction they undergo a transition towards the equilibrium state. We show that the zeroth l... |
1707.07419 | Bobir Toshmatov | Bobir Toshmatov, Zden\v{e}k Stuchl\'ik | Slowly decaying resonances of massive scalar fields around
Schwarzschild-de Sitter black holes | 8 pages, 5 figures | Eur. Phys. J. Plus 132, 324 (2017) | 10.1140/epjp/i2017-11596-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in special limiting cases quasinormal modes of massive scalar fields
in the Schwarzschild-de Sitter black hole backgrounds. We determine the lower
limit on the mass parameter of the scalar field that allows the waves with
quasinormal frequencies to propagate to infinity, showing that it depends on
the spacet... | [
{
"created": "Mon, 24 Jul 2017 06:47:39 GMT",
"version": "v1"
}
] | 2017-07-25 | [
[
"Toshmatov",
"Bobir",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | We study in special limiting cases quasinormal modes of massive scalar fields in the Schwarzschild-de Sitter black hole backgrounds. We determine the lower limit on the mass parameter of the scalar field that allows the waves with quasinormal frequencies to propagate to infinity, showing that it depends on the spacetim... |
2405.04450 | Quentin Vigneron | Quentin Vigneron and Julien Larena | A natural model for curved inflation | 5+5 pages; 1 figure; 1 table | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Inflationary models with a non-zero background curvature are ill-defined in
general relativity because scalar modes cannot be canonically quantized.
Therefore, there is no consensus on the primordial power spectrum that should
be considered at large scales in a curved Universe. In this letter, we propose
a model of c... | [
{
"created": "Tue, 7 May 2024 16:14:54 GMT",
"version": "v1"
}
] | 2024-05-08 | [
[
"Vigneron",
"Quentin",
""
],
[
"Larena",
"Julien",
""
]
] | Inflationary models with a non-zero background curvature are ill-defined in general relativity because scalar modes cannot be canonically quantized. Therefore, there is no consensus on the primordial power spectrum that should be considered at large scales in a curved Universe. In this letter, we propose a model of cur... |
1708.00806 | Joseph Mills | Joseph Mills, Vaibhav Tiwari, Stephen Fairhurst | Localization of binary mergers with gravitational-wave detectors of
second and third generation | 16 pages, 5 figures | Phys. Rev. D 97, 104064 (2018) | 10.1103/PhysRevD.97.104064 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of gravitational wave signals from binary black hole mergers
has established the field of gravitational wave astronomy. It is expected that
future networks of gravitational wave detectors will possess great potential in
probing various aspects of astronomy. An important consideration for successive
im... | [
{
"created": "Wed, 2 Aug 2017 15:56:45 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Mills",
"Joseph",
""
],
[
"Tiwari",
"Vaibhav",
""
],
[
"Fairhurst",
"Stephen",
""
]
] | The observation of gravitational wave signals from binary black hole mergers has established the field of gravitational wave astronomy. It is expected that future networks of gravitational wave detectors will possess great potential in probing various aspects of astronomy. An important consideration for successive impr... |
1003.3228 | Vjacheslav Dorofeev | V. Yu. Dorofeev | Octonionic Physics | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The physical solutions of Lagrangian of octonionics are researched in the
paper. It is shown, the gravitational interaction in Friedmann space and in
spherically symmetric space in such model is to be described by pair of charged
massless vectorial D-bosons of Minkowski space. It is proposed to use the
formalism for ... | [
{
"created": "Tue, 16 Mar 2010 19:45:58 GMT",
"version": "v1"
}
] | 2010-03-17 | [
[
"Dorofeev",
"V. Yu.",
""
]
] | The physical solutions of Lagrangian of octonionics are researched in the paper. It is shown, the gravitational interaction in Friedmann space and in spherically symmetric space in such model is to be described by pair of charged massless vectorial D-bosons of Minkowski space. It is proposed to use the formalism for th... |
gr-qc/9304023 | James Hartle | Murray Gell-Mann and James B. Hartle | Time Symmetry and Asymmetry in Quantum Mechanics and Quantum Cosmology | 30 pages, 3figures, revtex4, updated macros, embedded figures added
discussion and historical note of the published version | in Physical Origins of Time Asymmetry, ed by J. Halliwell, J.
Perez-Mercader, and W. Zurek, Cambridge University Press, Cambridge,(1994) | null | UCSBTH01-31 | gr-qc hep-th | null | We investigate the origin of the arrow of time in quantum mechanics in the
context of quantum cosmology. The ``Copenhagen'' quantum mechanics of measured
subsystems incorporates a fundamental arrow of time. Extending discussions of
Aharonov, Bergmann and Lebovitz, Griffiths, and others we investigate a
generalized qu... | [
{
"created": "Sun, 18 Apr 1993 20:02:54 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2005 20:22:58 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Gell-Mann",
"Murray",
""
],
[
"Hartle",
"James B.",
""
]
] | We investigate the origin of the arrow of time in quantum mechanics in the context of quantum cosmology. The ``Copenhagen'' quantum mechanics of measured subsystems incorporates a fundamental arrow of time. Extending discussions of Aharonov, Bergmann and Lebovitz, Griffiths, and others we investigate a generalized quan... |
gr-qc/0204038 | Francisco Lobo | Francisco Lobo and Paulo Crawford | Weak energy condition violation and superluminal travel | 15 pages, 3 figures, LaTeX2e, Springer style files -included.
Contribution to the Proceedings of the Spanish Relativity Meeting-2001
(Madrid, September 2001) | Lect.Notes Phys. 617 (2003) 277-291 | 10.1007/3-540-36973-2_15 | null | gr-qc | null | Recent solutions to the Einstein Field Equations involving negative energy
densities, i.e., matter violating the weak-energy-condition, have been
obtained, namely traversable wormholes, the Alcubierre warp drive and the
Krasnikov tube. These solutions are related to superluminal travel, although
locally the speed of ... | [
{
"created": "Tue, 9 Apr 2002 19:51:35 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2002 20:01:51 GMT",
"version": "v2"
}
] | 2022-09-21 | [
[
"Lobo",
"Francisco",
""
],
[
"Crawford",
"Paulo",
""
]
] | Recent solutions to the Einstein Field Equations involving negative energy densities, i.e., matter violating the weak-energy-condition, have been obtained, namely traversable wormholes, the Alcubierre warp drive and the Krasnikov tube. These solutions are related to superluminal travel, although locally the speed of li... |
1410.8271 | Lap-Ming Lin | Y.-H. Sham, T. K. Chan, L.-M. Lin, P. T. Leung | Unveiling the universality of I-Love-Q relations | Minor changes to match the published version | Astrophys.J.798,121,2015 | 10.1088/0004-637X/798/2/121 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent discovery of the universal I-Love-Q relations connecting the
moment of inertia, tidal deformability, and the spin-induced quadrupole moment
of compact stars is intriguing and totally unexpected. In this paper, we
provide numerical evidence showing that the universality can be attributed to
the incompressib... | [
{
"created": "Thu, 30 Oct 2014 07:05:48 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jan 2015 06:17:57 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Sham",
"Y. -H.",
""
],
[
"Chan",
"T. K.",
""
],
[
"Lin",
"L. -M.",
""
],
[
"Leung",
"P. T.",
""
]
] | The recent discovery of the universal I-Love-Q relations connecting the moment of inertia, tidal deformability, and the spin-induced quadrupole moment of compact stars is intriguing and totally unexpected. In this paper, we provide numerical evidence showing that the universality can be attributed to the incompressible... |
2403.13824 | Mostafa Bousder Dr. | M. Bousder and H. Ez-Zahraouy | Hopfions of massive gauge bosons in early universe | 5 pages, 4 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This letter presents a novel model that characterizes the curvature of
space-time, influenced by a massive gauge field in the early universe. This
curvature can lead to a multitude of observations, including the Hubble tension
issue and the isotropic stochastic gravitational-wave background. We introduce,
for the fir... | [
{
"created": "Tue, 5 Mar 2024 17:55:57 GMT",
"version": "v1"
}
] | 2024-03-22 | [
[
"Bousder",
"M.",
""
],
[
"Ez-Zahraouy",
"H.",
""
]
] | This letter presents a novel model that characterizes the curvature of space-time, influenced by a massive gauge field in the early universe. This curvature can lead to a multitude of observations, including the Hubble tension issue and the isotropic stochastic gravitational-wave background. We introduce, for the first... |
2207.12947 | Juan M. Z\'arate Pretel | Juan M. Z. Pretel, Takol Tangphati, Ayan Banerjee and Anirudh Pradhan | Charged quark stars in $f(R,T)$ gravity | 10 pages, 6 figures. To appear in Chinese Physics C | Chinese Phys. C 46 (2022) 115103 | 10.1088/1674-1137/ac84cb | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent advances in nuclear theory combined with new astrophysical
observations have led to the need for specific theoretical models that actually
apply to phenomena on dense-matter physics. At the same time, quantum
chromodynamics (QCD) predicts the existence of non-nucleonic degrees of freedom
at high densities in n... | [
{
"created": "Tue, 26 Jul 2022 14:52:17 GMT",
"version": "v1"
}
] | 2022-08-30 | [
[
"Pretel",
"Juan M. Z.",
""
],
[
"Tangphati",
"Takol",
""
],
[
"Banerjee",
"Ayan",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | Recent advances in nuclear theory combined with new astrophysical observations have led to the need for specific theoretical models that actually apply to phenomena on dense-matter physics. At the same time, quantum chromodynamics (QCD) predicts the existence of non-nucleonic degrees of freedom at high densities in neu... |
1802.09499 | Bret Underwood | Daniel J Burger, Saurya Das, S. Shajidul Haque, Nathan Moynihan, Bret
Underwood | Towards the Raychaudhuri Equation Beyond General Relativity | 21 pages. v2: Added references. v3: Matches published version,
references and clarifications added | Phys. Rev. D 98, 024006 (2018) | 10.1103/PhysRevD.98.024006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In General Relativity, gravity is universally attractive, a feature embodied
by the Raychaudhuri equation which requires that the expansion of a congruence
of geodesics is always non-increasing, as long as matter obeys the strong or
weak energy conditions. This behavior of geodesics is an important ingredient
in gene... | [
{
"created": "Mon, 26 Feb 2018 18:27:55 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Mar 2018 16:40:57 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Jul 2018 21:11:09 GMT",
"version": "v3"
}
] | 2018-07-09 | [
[
"Burger",
"Daniel J",
""
],
[
"Das",
"Saurya",
""
],
[
"Haque",
"S. Shajidul",
""
],
[
"Moynihan",
"Nathan",
""
],
[
"Underwood",
"Bret",
""
]
] | In General Relativity, gravity is universally attractive, a feature embodied by the Raychaudhuri equation which requires that the expansion of a congruence of geodesics is always non-increasing, as long as matter obeys the strong or weak energy conditions. This behavior of geodesics is an important ingredient in genera... |
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