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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1903.03836 | Rocco D'Agostino | Rocco D'Agostino | Holographic dark energy from nonadditive entropy: cosmological
perturbations and observational constraints | 10 pages, 4 figures. Accepted for publication in Physical Review D | Phys. Rev. D 99, 103524 (2019) | 10.1103/PhysRevD.99.103524 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the holographic principle in the cosmological context through the
nonadditive Tsallis entropy, used to describe the thermodynamic properties of
nonstandard statistical systems such as the gravitational ones. Assuming the
future event horizon as the infrared cutoff, we build a dark energy model free
from cosm... | [
{
"created": "Sat, 9 Mar 2019 17:47:14 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2019 14:20:27 GMT",
"version": "v2"
}
] | 2019-05-29 | [
[
"D'Agostino",
"Rocco",
""
]
] | We apply the holographic principle in the cosmological context through the nonadditive Tsallis entropy, used to describe the thermodynamic properties of nonstandard statistical systems such as the gravitational ones. Assuming the future event horizon as the infrared cutoff, we build a dark energy model free from cosmol... |
2012.04476 | Saeed Ullah Khan | Saeed Ullah Khan and Jingli Ren | Circular geodesics in Kerr-Newman-Kasuya black hole | 5 pages, 2 figures | AIP Conference Proceedings 2319, 040005 (2021) | 10.1063/5.0039635 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | This article explores the characteristics of ergoregion, horizons and
circular geodesics around a Kerr-Newman-Kasuya black hole. We investigate the
effect of spin and dyonic charge parameters on ergoregion, event horizon and
static limit surface of the said black hole. We observed that both electric, as
well as magne... | [
{
"created": "Sat, 5 Dec 2020 18:11:57 GMT",
"version": "v1"
}
] | 2021-02-09 | [
[
"Khan",
"Saeed Ullah",
""
],
[
"Ren",
"Jingli",
""
]
] | This article explores the characteristics of ergoregion, horizons and circular geodesics around a Kerr-Newman-Kasuya black hole. We investigate the effect of spin and dyonic charge parameters on ergoregion, event horizon and static limit surface of the said black hole. We observed that both electric, as well as magneti... |
gr-qc/9402002 | Jorge Pullin | Jorge Pullin (Editor) | MATTERS OF GRAVITY, a newsletter for the gravity community, Number 3 | Number 3, Plain Tex, 37 pages | null | null | MOG-3 | gr-qc astro-ph | null | Table of contents
Editorial
Correspondents
Gravity News:
Open Letter to gravitational physicists, Beverly Berger
A Missouri relativist in King Gustav's Court, Clifford Will
Gary Horowitz wins the Xanthopoulos award, Abhay Ashtekar
Research briefs:
Gamma-ray bursts and their possible cosmological impli... | [
{
"created": "Tue, 1 Feb 1994 19:19:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pullin",
"Jorge",
"",
"Editor"
]
] | Table of contents Editorial Correspondents Gravity News: Open Letter to gravitational physicists, Beverly Berger A Missouri relativist in King Gustav's Court, Clifford Will Gary Horowitz wins the Xanthopoulos award, Abhay Ashtekar Research briefs: Gamma-ray bursts and their possible cosmological implications, Peter Mes... |
2306.09019 | Ronaldas Macas | Ronaldas Macas, Andrew Lundgren | A Sensitive Test of Non-Gaussianity in Gravitational-wave Detector Data | 6 pages, 3 figures. PRD accepted | null | 10.1103/PhysRevD.108.063016 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Methods for parameter estimation of gravitational-wave data assume that
detector noise is stationary and Gaussian. Real data deviates from these
assumptions, which causes bias in the inferred parameters and incorrect
estimates of the errors. We develop a sensitive test of non-Gaussianity for
real gravitational-wave d... | [
{
"created": "Thu, 15 Jun 2023 10:27:40 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2023 11:26:56 GMT",
"version": "v2"
}
] | 2023-09-22 | [
[
"Macas",
"Ronaldas",
""
],
[
"Lundgren",
"Andrew",
""
]
] | Methods for parameter estimation of gravitational-wave data assume that detector noise is stationary and Gaussian. Real data deviates from these assumptions, which causes bias in the inferred parameters and incorrect estimates of the errors. We develop a sensitive test of non-Gaussianity for real gravitational-wave dat... |
2205.04097 | Mudhahir Al-Ajmi | Mudhahir Al Ajmi and Mark Hindmarsh | Thermal suppression of bubble nucleation at first-order phase
transitions in the early Universe | 12 pages, 19 figures | null | null | HIP-2022-3/TH | gr-qc | http://creativecommons.org/licenses/by/4.0/ | One of the key observables in a gravitational wave power spectrum from a
first order phase transition in the early Universe is the mean bubble spacing,
which depends on the rate of nucleation of bubbles of the stable phase, as well
as the bubble wall speed. When the bubbles expand as deflagrations, it is
expected tha... | [
{
"created": "Mon, 9 May 2022 07:59:49 GMT",
"version": "v1"
}
] | 2022-05-10 | [
[
"Ajmi",
"Mudhahir Al",
""
],
[
"Hindmarsh",
"Mark",
""
]
] | One of the key observables in a gravitational wave power spectrum from a first order phase transition in the early Universe is the mean bubble spacing, which depends on the rate of nucleation of bubbles of the stable phase, as well as the bubble wall speed. When the bubbles expand as deflagrations, it is expected that ... |
gr-qc/9703012 | Matthew S. Piper | W.B.Bonnor, M.S.Piper | Suppression of gravitational radiation | 10 pages LaTex | Class.Quant.Grav. 15 (1998) 955-963 | 10.1088/0264-9381/15/4/016 | null | gr-qc | null | We consider a burst of quadrupole gravitational radiation in the presence of
a large static mass $M$ situated at its source. Some of the radiation is
back-scattered off the static field of the large mass, forming a wave tail.
After the burst, the tail is a pure incoming wave, carrying energy back towards
the source. ... | [
{
"created": "Wed, 5 Mar 1997 15:32:32 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bonnor",
"W. B.",
""
],
[
"Piper",
"M. S.",
""
]
] | We consider a burst of quadrupole gravitational radiation in the presence of a large static mass $M$ situated at its source. Some of the radiation is back-scattered off the static field of the large mass, forming a wave tail. After the burst, the tail is a pure incoming wave, carrying energy back towards the source. We... |
1210.6736 | Bibhas Majhi Ranjan | Bibhas Ranjan Majhi | Noether current of the surface term of Einstein-Hilbert action, Virasoro
algebra and entropy | V2: 18 pages, no figures, clarifications and references added | Advances in High Energy Physics 2013 (2013) 386342 | 10.1155/2013/386342 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/3.0/ | A derivation of Noether current from the surface term of Einstein-Hilbert
action is given. We show that the corresponding charge, calculated on the
horizon, is related to the Bekenstein-Hawking entropy. Also using the charge,
the same entropy is found based on the Virasoro algebra and Cardy formula
approach. In this ... | [
{
"created": "Thu, 25 Oct 2012 04:10:29 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Oct 2012 11:06:02 GMT",
"version": "v2"
}
] | 2013-07-24 | [
[
"Majhi",
"Bibhas Ranjan",
""
]
] | A derivation of Noether current from the surface term of Einstein-Hilbert action is given. We show that the corresponding charge, calculated on the horizon, is related to the Bekenstein-Hawking entropy. Also using the charge, the same entropy is found based on the Virasoro algebra and Cardy formula approach. In this ap... |
2208.05730 | Davide Batic | Davide Batic, Suzan Hamad Abdul Karim, Marek Nowakowski | On the eigenvalues of the fermionic angular eigenfunctions in the Kerr
metric | 11 pages | Entropy 2022, 24(8), 1083 | 10.3390/e24081083 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In view of a result recently published in the context of deformation theory
of linear Hamiltonian systems, we reconsider the eigenvalue problem associated
to the angular equation arising after the separation of the Dirac equation in
the Kerr metric and we show how efficiently a quasi-linear first order PDE for
the an... | [
{
"created": "Thu, 11 Aug 2022 09:52:26 GMT",
"version": "v1"
}
] | 2022-08-12 | [
[
"Batic",
"Davide",
""
],
[
"Karim",
"Suzan Hamad Abdul",
""
],
[
"Nowakowski",
"Marek",
""
]
] | In view of a result recently published in the context of deformation theory of linear Hamiltonian systems, we reconsider the eigenvalue problem associated to the angular equation arising after the separation of the Dirac equation in the Kerr metric and we show how efficiently a quasi-linear first order PDE for the angu... |
1304.8122 | Slava G. Turyshev | Slava G. Turyshev and Viktor T. Toth | New perturbative method for solving the gravitational N-body problem in
the general theory of relativity | revtex4, 48 pages. arXiv admin note: text overlap with
arXiv:1109.1796 | Int.J.Mod.Phys.D24(6): 1550039 (2015) | 10.1142/S021827181550039X | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new approach to describe the dynamics of an isolated,
gravitationally bound astronomical $N$-body system in the weak field and
slow-motion approximation of the general theory of relativity. Celestial bodies
are described using an arbitrary energy-momentum tensor and assumed to possess
any number of inter... | [
{
"created": "Tue, 30 Apr 2013 19:17:48 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 2015 21:53:49 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Mar 2015 20:33:35 GMT",
"version": "v3"
}
] | 2015-03-30 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Toth",
"Viktor T.",
""
]
] | We present a new approach to describe the dynamics of an isolated, gravitationally bound astronomical $N$-body system in the weak field and slow-motion approximation of the general theory of relativity. Celestial bodies are described using an arbitrary energy-momentum tensor and assumed to possess any number of interna... |
gr-qc/0406042 | James E. Lidsey | James E. Lidsey, David J. Mulryne, N. J. Nunes and Reza Tavakol | Oscillatory Universes in Loop Quantum Cosmology and Initial Conditions
for Inflation | 6 pages, 4 figures | Phys.Rev.D70:063521,2004 | 10.1103/PhysRevD.70.063521 | null | gr-qc astro-ph hep-th | null | Positively-curved, oscillatory universes are studied within the context of
Loop Quantum Cosmology subject to a consistent semi-classical treatment. The
semi-classical effects are reformulated in terms of an effective phantom fluid
with a variable equation of state. In cosmologies sourced by a massless scalar
field, t... | [
{
"created": "Thu, 10 Jun 2004 15:40:42 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2004 10:33:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lidsey",
"James E.",
""
],
[
"Mulryne",
"David J.",
""
],
[
"Nunes",
"N. J.",
""
],
[
"Tavakol",
"Reza",
""
]
] | Positively-curved, oscillatory universes are studied within the context of Loop Quantum Cosmology subject to a consistent semi-classical treatment. The semi-classical effects are reformulated in terms of an effective phantom fluid with a variable equation of state. In cosmologies sourced by a massless scalar field, the... |
1807.07941 | Rajibul Shaikh | Rajibul Shaikh (TIFR Mumbai, India) | Wormholes with nonexotic matter in Born-Infeld gravity | 21 pages, no figure, matches published version | Phys. Rev. D 98, 064033 (2018) | 10.1103/PhysRevD.98.064033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, in contrast to general relativity, in Eddington-inspired
Born-Infeld gravity (EiBI), a violation of the null convergence condition does
not necessarily lead to a violation of the null energy condition, by
establishing a relationship between them. This serves as a motivation for
finding wormhole solution... | [
{
"created": "Fri, 20 Jul 2018 16:57:29 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Sep 2018 16:58:29 GMT",
"version": "v2"
}
] | 2018-09-18 | [
[
"Shaikh",
"Rajibul",
"",
"TIFR Mumbai, India"
]
] | We show that, in contrast to general relativity, in Eddington-inspired Born-Infeld gravity (EiBI), a violation of the null convergence condition does not necessarily lead to a violation of the null energy condition, by establishing a relationship between them. This serves as a motivation for finding wormhole solutions ... |
gr-qc/0404089 | Ujjal Debnath | Asit Banerjee, Ujjal Debnath, Subenoy Chakraborty | Higher Dimensional Szekeres' Space-time in Brans-Dicke Scalar Tensor
Theory | null | Int.J.Mod.Phys. D13 (2004) 1073-1084 | 10.1142/S0218271804005055 | null | gr-qc | null | The generalized Szekeres family of solution for quasi-spherical space-time of
higher dimensions are obtained in the scalar tensor theory of gravitation.
Brans-Dicke field equations expressed in Dicke's revised units are exhaustively
solved for all the subfamilies of the said family. A particular group of
solutions ma... | [
{
"created": "Wed, 21 Apr 2004 11:10:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Banerjee",
"Asit",
""
],
[
"Debnath",
"Ujjal",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The generalized Szekeres family of solution for quasi-spherical space-time of higher dimensions are obtained in the scalar tensor theory of gravitation. Brans-Dicke field equations expressed in Dicke's revised units are exhaustively solved for all the subfamilies of the said family. A particular group of solutions may ... |
1408.5484 | Andrea Geralico | Donato Bini and Andrea Geralico | Extended bodies in a Kerr spacetime: exploring the role of a general
quadrupole tensor | 18 pages, 6 figures; published version. arXiv admin note: text
overlap with arXiv:1311.7512 | Class. Quantum Grav. 31, 075024 (2014) | 10.1088/0264-9381/31/7/075024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equatorial motion of extended bodies in a Kerr spacetime is investigated
in the framework of the Mathisson-Papapetrou-Dixon model, including the full
set of effective components of the quadrupole tensor. The numerical integration
of the associated equations shows the specific role of the mass and current
quadrupo... | [
{
"created": "Sat, 23 Aug 2014 10:32:45 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | The equatorial motion of extended bodies in a Kerr spacetime is investigated in the framework of the Mathisson-Papapetrou-Dixon model, including the full set of effective components of the quadrupole tensor. The numerical integration of the associated equations shows the specific role of the mass and current quadrupole... |
2010.15023 | Ali Mostafazadeh | Bahareh Azad, Farhang Loran, and Ali Mostafazadeh | Transmission of low-energy scalar waves through a traversable wormhole | 21 pages, 3 figures, references added, accepted for publication in
European Physical Journal C | null | 10.1140/epjc/s10052-020-08668-3 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the scattering of low-energy massless and massive minimally coupled
scalar fields by an asymptotically flat traversable wormhole. We provide a
comprehensive treatment of this problem offering analytic expressions for the
transmission and reflection amplitudes of the corresponding effective potential
and the ... | [
{
"created": "Wed, 28 Oct 2020 14:55:31 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2020 06:54:07 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Nov 2020 17:41:59 GMT",
"version": "v3"
}
] | 2020-12-30 | [
[
"Azad",
"Bahareh",
""
],
[
"Loran",
"Farhang",
""
],
[
"Mostafazadeh",
"Ali",
""
]
] | We study the scattering of low-energy massless and massive minimally coupled scalar fields by an asymptotically flat traversable wormhole. We provide a comprehensive treatment of this problem offering analytic expressions for the transmission and reflection amplitudes of the corresponding effective potential and the ab... |
2311.06932 | Vasilis Oikonomou | Shin'ichi Nojiri, S.D. Odintsov, V.K. Oikonomou | Propagation of Gravitational Waves in Einstein--Gauss-Bonnet Gravity for
Cosmological and Spherically Symmetric Spacetimes | PRD Accepted | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we examine the propagation of gravitational waves in
cosmological and astrophysical spacetimes in the context of
Einstein--Gauss-Bonnet gravity, in view of the GW170817 event. The perspective
we approach the problem is to obtain a theory which can produce a gravitational
wave speed that is equal to that... | [
{
"created": "Sun, 12 Nov 2023 19:12:05 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2023 22:13:44 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Jan 2024 16:40:37 GMT",
"version": "v3"
}
] | 2024-01-30 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this work, we examine the propagation of gravitational waves in cosmological and astrophysical spacetimes in the context of Einstein--Gauss-Bonnet gravity, in view of the GW170817 event. The perspective we approach the problem is to obtain a theory which can produce a gravitational wave speed that is equal to that o... |
2302.07283 | Jonathan Oppenheim | Jonathan Oppenheim and Zachary Weller-Davies | Covariant path integrals for quantum fields back-reacting on classical
space-time | 8 pages plus 4 appendices | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce configuration space path integrals for quantum fields
interacting with classical fields. We show that this can be done consistently
by proving that the dynamics are completely positive directly, without
resorting to master equation methods. These path integrals allow one to readily
impose space-time symm... | [
{
"created": "Tue, 14 Feb 2023 19:00:10 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2023 02:05:48 GMT",
"version": "v2"
}
] | 2023-11-16 | [
[
"Oppenheim",
"Jonathan",
""
],
[
"Weller-Davies",
"Zachary",
""
]
] | We introduce configuration space path integrals for quantum fields interacting with classical fields. We show that this can be done consistently by proving that the dynamics are completely positive directly, without resorting to master equation methods. These path integrals allow one to readily impose space-time symmet... |
1101.3569 | Jan Schee | Zdenek Stuchlik and Jan Schee | Appearance of Keplerian discs orbiting Kerr superspinars | accepted in Classical and Quantum Gravity (September 1st, 2010) | Class.Quant.Grav.27:215017,2010 | 10.1088/0264-9381/27/21/215017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study optical phenomena related to appearance of Keplerian accretion discs
orbiting Kerr superspinars predicted by the string theory. The superspinar
exterior is described by the standard Kerr naked singularity geometry breaking
the black hole limit on the internal angular momentum (spin). We construct
local photo... | [
{
"created": "Wed, 19 Jan 2011 08:57:25 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Stuchlik",
"Zdenek",
""
],
[
"Schee",
"Jan",
""
]
] | We study optical phenomena related to appearance of Keplerian accretion discs orbiting Kerr superspinars predicted by the string theory. The superspinar exterior is described by the standard Kerr naked singularity geometry breaking the black hole limit on the internal angular momentum (spin). We construct local photon ... |
2304.10117 | Chaowanzhen Wang | Chao-Wan-Zhen Wang, Jin-Bao Zhu, Guo-Qing Huang, and Fu-Wen Shu | Testing the first law of black hole mechanics with gravitational waves | 8 pages, 4 figures, 4 tables | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The successful observation of gravitational waves has provided humanity with
an additional method to explore the universe, particularly black holes. In this
study, we utilize data from LIGO and Virgo gravitational wave observations to
test the first law of black hole mechanics, employing two different approaches.
We ... | [
{
"created": "Thu, 20 Apr 2023 06:43:06 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2024 08:33:21 GMT",
"version": "v2"
}
] | 2024-06-26 | [
[
"Wang",
"Chao-Wan-Zhen",
""
],
[
"Zhu",
"Jin-Bao",
""
],
[
"Huang",
"Guo-Qing",
""
],
[
"Shu",
"Fu-Wen",
""
]
] | The successful observation of gravitational waves has provided humanity with an additional method to explore the universe, particularly black holes. In this study, we utilize data from LIGO and Virgo gravitational wave observations to test the first law of black hole mechanics, employing two different approaches. We co... |
1705.06506 | Amirfarshad Bahrehbakhsh | Amirfarshad Bahrehbakhsh | FLRW Cosmology of Induced Dark Energy Model and Open Universe | Accepted for publication in Canadian Journal of Physics | Canadian Journal of Physics, 2017, 95(12): 1215-1218 | 10.1139/cjp-2016-0827 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the FLRW type cosmology of the Induced Dark Energy model and
illustrate that the extra terms emerging from the fifth dimension can play the
role of dark energy. The model predicts the expansion with deceleration at
early time and acceleration in late time for an open universe.
| [
{
"created": "Thu, 18 May 2017 10:15:55 GMT",
"version": "v1"
}
] | 2017-12-27 | [
[
"Bahrehbakhsh",
"Amirfarshad",
""
]
] | We investigate the FLRW type cosmology of the Induced Dark Energy model and illustrate that the extra terms emerging from the fifth dimension can play the role of dark energy. The model predicts the expansion with deceleration at early time and acceleration in late time for an open universe. |
1110.2408 | \"Ozg\"ur Akarsu | Suresh Kumar, Ozgur Akarsu | Bianchi type II models in the presence of perfect fluid and anisotropic
dark energy | 15 pages; 5 figures; matches the version published in The European
Physical Journal Plus | The European Physical Journal Plus 127 (2012) 64 | 10.1140/epjp/i2012-12064-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spatially homogeneous but totally anisotropic and non-flat Bianchi type II
cosmological model has been studied in general relativity in the presence of
two minimally interacting fluids; a perfect fluid as the matter fluid and a
hypothetical anisotropic fluid as the dark energy fluid. The Einstein's field
equations ha... | [
{
"created": "Tue, 11 Oct 2011 15:54:00 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jun 2012 13:02:57 GMT",
"version": "v2"
}
] | 2012-06-18 | [
[
"Kumar",
"Suresh",
""
],
[
"Akarsu",
"Ozgur",
""
]
] | Spatially homogeneous but totally anisotropic and non-flat Bianchi type II cosmological model has been studied in general relativity in the presence of two minimally interacting fluids; a perfect fluid as the matter fluid and a hypothetical anisotropic fluid as the dark energy fluid. The Einstein's field equations have... |
1112.2511 | Winston Fairbairn | Winston J. Fairbairn, Catherine Meusburger | q-Deformation of Lorentzian spin foam models | 12 pages, 2 figures, Proceedings of the 3rd Quantum Gravity and
Quantum Geometry School (Zakopane, 2011), to appear in PoS | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct and analyse a quantum deformation of the Lorentzian EPRL model.
The model is based on the representation theory of the quantum Lorentz group
with real deformation parameter. We give a definition of the quantum EPRL
intertwiner, study its convergence and braiding properties and construct an
amplitude for ... | [
{
"created": "Mon, 12 Dec 2011 11:09:51 GMT",
"version": "v1"
}
] | 2011-12-13 | [
[
"Fairbairn",
"Winston J.",
""
],
[
"Meusburger",
"Catherine",
""
]
] | We construct and analyse a quantum deformation of the Lorentzian EPRL model. The model is based on the representation theory of the quantum Lorentz group with real deformation parameter. We give a definition of the quantum EPRL intertwiner, study its convergence and braiding properties and construct an amplitude for th... |
2111.07731 | David Viennot | David Viennot | Fuzzy Schwarzschild (2+1)-spacetime | null | J. Math. Phys. 63, 082302 (2022) | 10.1063/5.0091364 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a toy model of fuzzy Schwarzschild space slice (as a
noncommutative manifold) which quantum mean values and quantum quasi-coherent
states (states minimizing the quantum uncertainties) have properties close to
the classical slice of the $(r,\theta)$ Schwarzschild coordinates (the
so-called Flamm's paraboloi... | [
{
"created": "Mon, 15 Nov 2021 13:22:24 GMT",
"version": "v1"
}
] | 2022-08-31 | [
[
"Viennot",
"David",
""
]
] | We present a toy model of fuzzy Schwarzschild space slice (as a noncommutative manifold) which quantum mean values and quantum quasi-coherent states (states minimizing the quantum uncertainties) have properties close to the classical slice of the $(r,\theta)$ Schwarzschild coordinates (the so-called Flamm's paraboloid)... |
gr-qc/0109091 | Bayram Tekin | S. Deser and Bayram Tekin | Newtonian Counterparts of Spin 2 Massless Discontinuities | 6 pages, amplifies the ``Newtonian cosmology'' analysis. To appear as
a Class. Quantum Grav. Letter | Class.Quant.Grav.18:L171,2001 | 10.1088/0264-9381/18/23/103 | BRX-TH-495 | gr-qc hep-th | null | Massive spin 2 theories in flat or cosmological ($\Lambda \ne 0$) backgrounds
are subject to discontinuities as the masses tend to zero. We show and explain
physically why their Newtonian limits do not inherit this behaviour. On the
other hand, conventional ``Newtonian cosmology'', where $\Lambda $ is a
constant sour... | [
{
"created": "Thu, 27 Sep 2001 19:58:52 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2001 21:17:30 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Oct 2001 15:54:57 GMT",
"version": "v3"
}
] | 2010-04-06 | [
[
"Deser",
"S.",
""
],
[
"Tekin",
"Bayram",
""
]
] | Massive spin 2 theories in flat or cosmological ($\Lambda \ne 0$) backgrounds are subject to discontinuities as the masses tend to zero. We show and explain physically why their Newtonian limits do not inherit this behaviour. On the other hand, conventional ``Newtonian cosmology'', where $\Lambda $ is a constant source... |
2401.17689 | Shao-Wen Wei | Shao-Wen Wei, Yuan-Chuan Zou, Yu-Peng Zhang, Yu-Xiao Liu | Constraining black hole parameters with the precessing jet nozzle of
M87* | 11 pages, 8 figures. Typos are corrected | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Recently, Cui et al. [Nature \textbf{621}, 711 (2023)] reported that the jet
nozzle of M87* exhibits a precession with a period of approximately 11 years.
This finding strongly suggests that M87* is a spinning black hole with a tilted
accretion disk. In this paper, our aim is to utilize these observations to
constrai... | [
{
"created": "Wed, 31 Jan 2024 09:18:22 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2024 09:22:02 GMT",
"version": "v2"
}
] | 2024-02-02 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Zou",
"Yuan-Chuan",
""
],
[
"Zhang",
"Yu-Peng",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Recently, Cui et al. [Nature \textbf{621}, 711 (2023)] reported that the jet nozzle of M87* exhibits a precession with a period of approximately 11 years. This finding strongly suggests that M87* is a spinning black hole with a tilted accretion disk. In this paper, our aim is to utilize these observations to constrain ... |
1404.0211 | Sravan Kumar Korumilli | K. Sravan Kumar, J. Marto, Nelson J. Nunes and Paulo Vargas Moniz | Inflation in a two 3-form fields scenario | Version accepted in JCAP. 22 pages, 12 figures, new refs added | JCAP06(2014)064 | 10.1088/1475-7516/2014/06/064 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A setting constituted by $\mathbb{N}$ 3-form fields, without any direct
interaction between them, minimally coupled to gravity, is introduced in this
paper as a framework to study the early evolution of the universe. We focus
particularly on the two 3-forms case. An inflationary scenario is found,
emerging from the c... | [
{
"created": "Tue, 1 Apr 2014 12:15:15 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jul 2014 11:23:21 GMT",
"version": "v2"
}
] | 2014-07-04 | [
[
"Kumar",
"K. Sravan",
""
],
[
"Marto",
"J.",
""
],
[
"Nunes",
"Nelson J.",
""
],
[
"Moniz",
"Paulo Vargas",
""
]
] | A setting constituted by $\mathbb{N}$ 3-form fields, without any direct interaction between them, minimally coupled to gravity, is introduced in this paper as a framework to study the early evolution of the universe. We focus particularly on the two 3-forms case. An inflationary scenario is found, emerging from the cou... |
1511.06210 | Axel de la Macorra | Leonardo Quintanar G., Axel de la Macorra | Cosmology and Quantum Field Theory: A study of the Nambu-Jona-Lasinio
Model | 17 pages, 11 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the Nambu-Jona-Lasinio model (NJL), proposed long time ago, as a
four-fermion interaction theory with chiral symmetry. The theory is not
renormalizable and presents a symmetry breaking due to quantum corrections
which depends on the strength of the coupling constant. We may associate a
phase transition with... | [
{
"created": "Thu, 19 Nov 2015 15:35:41 GMT",
"version": "v1"
}
] | 2015-11-20 | [
[
"G.",
"Leonardo Quintanar",
""
],
[
"de la Macorra",
"Axel",
""
]
] | We review the Nambu-Jona-Lasinio model (NJL), proposed long time ago, as a four-fermion interaction theory with chiral symmetry. The theory is not renormalizable and presents a symmetry breaking due to quantum corrections which depends on the strength of the coupling constant. We may associate a phase transition with t... |
1706.05900 | Pierre-Henri Chavanis | Pierre-Henri Chavanis | Derivation of a generalized Schr\"odinger equation for dark matter halos
from the theory of scale relativity | null | Phys. Dark Univ. 22, 80 (2018) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using Nottale's theory of scale relativity, we derive a generalized
Schr\"odinger equation applying to dark matter halos. This equation involves a
logarithmic nonlinearity associated with an effective temperature and a source
of dissipation. Fundamentally, this wave equation arises from the
nondifferentiability of th... | [
{
"created": "Mon, 19 Jun 2017 12:23:08 GMT",
"version": "v1"
},
{
"created": "Thu, 10 May 2018 18:10:04 GMT",
"version": "v2"
}
] | 2019-09-16 | [
[
"Chavanis",
"Pierre-Henri",
""
]
] | Using Nottale's theory of scale relativity, we derive a generalized Schr\"odinger equation applying to dark matter halos. This equation involves a logarithmic nonlinearity associated with an effective temperature and a source of dissipation. Fundamentally, this wave equation arises from the nondifferentiability of the ... |
gr-qc/9605072 | Michele Maggiore | A. Buonanno, M. Maggiore, and C. Ungarelli | Spectrum of relic gravitational waves in string cosmology | 12 pages, Latex,6 figures | Phys.Rev.D55:3330-3336,1997 | 10.1103/PhysRevD.55.3330 | IFUP-TH 25/96 | gr-qc astro-ph hep-th | null | We compute the spectrum of relic gravitons in a model of string cosmology. In
the low- and in the high-frequency limits we reproduce known results. The full
spectrum, however, also displays a series of oscillations which could give a
characteristic signature at the planned LIGO/VIRGO detectors. For special
values of ... | [
{
"created": "Fri, 31 May 1996 13:04:27 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Buonanno",
"A.",
""
],
[
"Maggiore",
"M.",
""
],
[
"Ungarelli",
"C.",
""
]
] | We compute the spectrum of relic gravitons in a model of string cosmology. In the low- and in the high-frequency limits we reproduce known results. The full spectrum, however, also displays a series of oscillations which could give a characteristic signature at the planned LIGO/VIRGO detectors. For special values of th... |
1005.5730 | Rafael Porto | Rafael A. Porto | Next to leading order spin-orbit effects in the motion of inspiralling
compact binaries | 25 pages, 4 figures, revtex4. v2: minor changes, refs. added. To
appear in Class. Quant. Grav | Class.Quant.Grav.27:205001,2010 | 10.1088/0264-9381/27/20/205001 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using effective field theory (EFT) techniques we calculate the
next-to-leading order (NLO) spin-orbit contributions to the gravitational
potential of inspiralling compact binaries. We use the covariant spin
supplementarity condition (SSC), and explicitly prove the equivalence with
previous results by Faye et al. in a... | [
{
"created": "Mon, 31 May 2010 19:37:51 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2010 04:09:41 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Porto",
"Rafael A.",
""
]
] | Using effective field theory (EFT) techniques we calculate the next-to-leading order (NLO) spin-orbit contributions to the gravitational potential of inspiralling compact binaries. We use the covariant spin supplementarity condition (SSC), and explicitly prove the equivalence with previous results by Faye et al. in arX... |
gr-qc/9604048 | Carl Brans | Carl H. Brans (Loyola University) | Exotic Smoothness on Spacetime | To appear in proceedings of Pacific Conference on Gravitation and
Cosmology, Seoul , 1996. LaTeX, 16 pages | null | 10.1007/978-94-011-5812-1_27 | null | gr-qc | null | Recent discoveries in differential topology are reviewed in light of their
possible implications for spacetime models and related subjects in theoretical
physics. Although not often noted, a particular smoothness (differentiability)
structure must be imposed on a topological manifold before geometric or other
structu... | [
{
"created": "Wed, 24 Apr 1996 11:25:20 GMT",
"version": "v1"
}
] | 2016-01-27 | [
[
"Brans",
"Carl H.",
"",
"Loyola University"
]
] | Recent discoveries in differential topology are reviewed in light of their possible implications for spacetime models and related subjects in theoretical physics. Although not often noted, a particular smoothness (differentiability) structure must be imposed on a topological manifold before geometric or other structure... |
0906.4983 | Yuuiti Sendouda | Nathalie Deruelle, Yuuiti Sendouda, Ahmed Youssef | Various Hamiltonian formulations of f(R) gravity and their canonical
relationships | 15 pages, REVTeX 4 | Phys.Rev.D80:084032,2009 | 10.1103/PhysRevD.80.084032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various Hamiltonian formulations of f(R) gravity can be found in the
literature. Some authors follow the Ostrogradsky treatment of higher derivative
theories and introduce as extra variables first order time derivatives of the
metric (typically the extrinsic curvature). Some others take advantage of the
conformal equ... | [
{
"created": "Fri, 26 Jun 2009 19:54:30 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"Deruelle",
"Nathalie",
""
],
[
"Sendouda",
"Yuuiti",
""
],
[
"Youssef",
"Ahmed",
""
]
] | Various Hamiltonian formulations of f(R) gravity can be found in the literature. Some authors follow the Ostrogradsky treatment of higher derivative theories and introduce as extra variables first order time derivatives of the metric (typically the extrinsic curvature). Some others take advantage of the conformal equiv... |
2112.13403 | Kristo Nugraha Lian | K. N. Lian | Gravity Theories via Algebra Gauging | 42 pages | null | null | null | gr-qc physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | This work presents instructive, yet comprehensive derivation of quantized
gravity theories in relativistic, classical, and semi-classical spacetime
structure based on the Poincar\'e, Galilean, and Bargmann algebra,
respectively. The technique of algebra gauging to construct the spacetime
dynamics - inspired by the ap... | [
{
"created": "Sun, 26 Dec 2021 15:49:50 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Dec 2021 07:17:45 GMT",
"version": "v2"
}
] | 2021-12-30 | [
[
"Lian",
"K. N.",
""
]
] | This work presents instructive, yet comprehensive derivation of quantized gravity theories in relativistic, classical, and semi-classical spacetime structure based on the Poincar\'e, Galilean, and Bargmann algebra, respectively. The technique of algebra gauging to construct the spacetime dynamics - inspired by the appr... |
gr-qc/0701009 | Sante Carloni | S Carloni, J A Leach, S Capozziello, P K S Dunsby | Cosmological dynamics of Scalar--Tensor Gravity | 25 pages, 4 figures, 12 tables, submitted to CQG | Class.Quant.Grav.25:035008,2008 | 10.1088/0264-9381/25/3/035008 | null | gr-qc | null | We study the phase--space of FLRW models derived from Scalar--Tensor Gravity
where the non--minimal coupling is $F(\phi)=\xi\phi^2$ and the effective
potential is $V(\phi)=\lambda \phi^n$. Our analysis allows to unfold many
feature of the cosmology of this class of theories. For example, the evolution
mechanism towar... | [
{
"created": "Sun, 31 Dec 2006 13:29:20 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Feb 2007 07:29:05 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Aug 2007 15:30:13 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Carloni",
"S",
""
],
[
"Leach",
"J A",
""
],
[
"Capozziello",
"S",
""
],
[
"Dunsby",
"P K S",
""
]
] | We study the phase--space of FLRW models derived from Scalar--Tensor Gravity where the non--minimal coupling is $F(\phi)=\xi\phi^2$ and the effective potential is $V(\phi)=\lambda \phi^n$. Our analysis allows to unfold many feature of the cosmology of this class of theories. For example, the evolution mechanism towards... |
1412.0867 | Francisco Lobo | Francisco S. N. Lobo | Beyond Einstein's General Relativity | 16 pages. Proceedings based on a plenary talk delivered at the
Spanish Relativity Meeting 2014 (ERE-2014). V2: references added, typos
corrected. V3: reference added | Journal of Physics: Conference Series 600 (2015) 012006 | 10.1088/1742-6596/600/1/012006 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modern astrophysical and cosmological models are plagued with two severe
theoretical difficulties, namely, the dark energy and the dark matter problems.
Relative to the former, high-precision observational data have confirmed with
startling evidence that the Universe is undergoing a phase of accelerated
expansion. Th... | [
{
"created": "Tue, 2 Dec 2014 11:43:47 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2014 14:40:04 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Dec 2014 22:25:11 GMT",
"version": "v3"
}
] | 2015-05-05 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | Modern astrophysical and cosmological models are plagued with two severe theoretical difficulties, namely, the dark energy and the dark matter problems. Relative to the former, high-precision observational data have confirmed with startling evidence that the Universe is undergoing a phase of accelerated expansion. This... |
1606.02164 | Vasilis Oikonomou | V.K. Oikonomou | Gauss-Bonnet Cosmology Unifying Late and Early-time Acceleration Eras
with Intermediate Eras | null | null | 10.1007/s10509-016-2800-6 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we demonstrate that with vacuum $F(G)$ gravity it is possible
to describe the unification of late and early-time acceleration eras with the
radiation and matter domination era. The Hubble rate of the unified evolution
contains two mild singularities, so called Type IV singularities, and the
evolution it... | [
{
"created": "Tue, 7 Jun 2016 14:59:41 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this paper we demonstrate that with vacuum $F(G)$ gravity it is possible to describe the unification of late and early-time acceleration eras with the radiation and matter domination era. The Hubble rate of the unified evolution contains two mild singularities, so called Type IV singularities, and the evolution itse... |
2103.15044 | Francesco Di Filippo | Katsuki Aoki, Francesco Di Filippo, Shinji Mukohyama | Non-uniqueness of massless transverse-traceless graviton | 19 pages, 1 figure | null | 10.1088/1475-7516/2021/05/071 | YITP-21-24, IPMU21-0021 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study a theory of minimally modified gravity called cuscuton/VCDM that
propagates only two gravitational degrees of freedom. Despite being apparently
different from general relativity (GR), it is in principle possible that this
theory might be obtained via a field redefinition starting from the GR action.
This wou... | [
{
"created": "Sun, 28 Mar 2021 04:31:50 GMT",
"version": "v1"
}
] | 2021-06-02 | [
[
"Aoki",
"Katsuki",
""
],
[
"Di Filippo",
"Francesco",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | We study a theory of minimally modified gravity called cuscuton/VCDM that propagates only two gravitational degrees of freedom. Despite being apparently different from general relativity (GR), it is in principle possible that this theory might be obtained via a field redefinition starting from the GR action. This would... |
2406.01632 | Muhammad Sharif | M. Sharif and K. Hassan | Compact Objects by Extended Gravitational Decoupling in f(G,T) Gravity | 33 pages, 9 figures | Indian J. Physics 98(2024)2633-2652 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the anisotropic interior spherically symmetric
solutions by utilizing the extended gravitational decoupling method in the
background of $f(G,T)$ gravity, where $G$ and $T$ signify the Gauss-Bonnet term
and trace of the stress-energy tensor, respectively. The anisotropy in the
interior ge... | [
{
"created": "Sat, 1 Jun 2024 12:17:41 GMT",
"version": "v1"
}
] | 2024-06-05 | [
[
"Sharif",
"M.",
""
],
[
"Hassan",
"K.",
""
]
] | In this paper, we investigate the anisotropic interior spherically symmetric solutions by utilizing the extended gravitational decoupling method in the background of $f(G,T)$ gravity, where $G$ and $T$ signify the Gauss-Bonnet term and trace of the stress-energy tensor, respectively. The anisotropy in the interior geom... |
2112.06056 | Nishanth Abu Gudapati | Nishanth Gudapati | Energy Extraction, or Lack Thereof | a review, intended for a broader and interdisciplinary audience | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of stability of rotating black holes is the subject of a long
standing research program since the 1960s and remains an unresolved problem in
general relativity. A major obstacle in the black hole stability problem is
that the energy of waves propagating through rotating black holes spacetimes is
not neces... | [
{
"created": "Sat, 11 Dec 2021 19:42:50 GMT",
"version": "v1"
}
] | 2021-12-14 | [
[
"Gudapati",
"Nishanth",
""
]
] | The problem of stability of rotating black holes is the subject of a long standing research program since the 1960s and remains an unresolved problem in general relativity. A major obstacle in the black hole stability problem is that the energy of waves propagating through rotating black holes spacetimes is not necessa... |
0908.4233 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Theoretical construction of Morris-Thorne wormholes compatible with
quantum field theory | This paper is based on a talk given at the Center for Gravitation and
Cosmology (University of Wisconsin-Milwaukee), September, 2007. (Expanded
version with updated quantum inequalities) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper completes and extends some earlier studies by the author to show
that Morris-Thorne wormholes are compatible with quantum field theory. The
strategy is to strike a balance between reducing the size of the unavoidable
exotic region and the degree of fine-tuning of the metric coefficients required
to achieve... | [
{
"created": "Fri, 28 Aug 2009 16:10:36 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 2009 21:05:41 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Nov 2010 01:06:58 GMT",
"version": "v3"
}
] | 2010-11-09 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | This paper completes and extends some earlier studies by the author to show that Morris-Thorne wormholes are compatible with quantum field theory. The strategy is to strike a balance between reducing the size of the unavoidable exotic region and the degree of fine-tuning of the metric coefficients required to achieve t... |
1008.3244 | Jude Prezens Mr | Jude Prezens | The Double Kerr Solution as a Possible Mechanism for Controlled Global
Causality Violation | 10 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For over 25 years, a solution has existed to Einstein's vacuum equation that
describes a space-time with two Kerr black holes. First formulated by Kramer
and Neugebauer (KN) in 1980 [1], this solution has been extensively researched
by many, with many and varied implications. One of which is causality
violation.
| [
{
"created": "Thu, 19 Aug 2010 09:04:35 GMT",
"version": "v1"
}
] | 2010-08-20 | [
[
"Prezens",
"Jude",
""
]
] | For over 25 years, a solution has existed to Einstein's vacuum equation that describes a space-time with two Kerr black holes. First formulated by Kramer and Neugebauer (KN) in 1980 [1], this solution has been extensively researched by many, with many and varied implications. One of which is causality violation. |
2004.06884 | Snehasish Bhattacharjee | Snehasish Bhattacharjee | Growth of matter fluctuations in $f(R,T)$ Gravity | Published in Chinese Journal of Physics | Chinese Journal of Physics, 68, 633-640 (2020) | 10.1016/j.cjph.2020.09.033 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this work, I present for the first time the analysis concerning the growth
of matter fluctuations in the framework of $f(R,T)$ modified gravity where I
presume $f(R,T) = R + \lambda T$, where $R$ denote the Ricci scalar, $T$ the
trace of the energy-momentum tensor and $\lambda$ a constant. I first solve the
Friedm... | [
{
"created": "Wed, 15 Apr 2020 05:15:06 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2020 13:57:18 GMT",
"version": "v2"
}
] | 2020-11-06 | [
[
"Bhattacharjee",
"Snehasish",
""
]
] | In this work, I present for the first time the analysis concerning the growth of matter fluctuations in the framework of $f(R,T)$ modified gravity where I presume $f(R,T) = R + \lambda T$, where $R$ denote the Ricci scalar, $T$ the trace of the energy-momentum tensor and $\lambda$ a constant. I first solve the Friedman... |
2102.00840 | Merce Guerrero | Merce Guerrero, Gonzalo J. Olmo, Diego Rubiera-Garcia | Double shadows of reflection-asymmetric wormholes supported by positive
energy thin-shells | 14 pages, 15 figures, revtex4-1 style | null | 10.1088/1475-7516/2021/04/066 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider reflection-asymmetric thin-shell wormholes within Palatini
$f(\mathcal{R})$ gravity using a matching procedure of two patches of
electrovacuum space-times at a hypersurface (the shell) via suitable junction
conditions. The conditions for having (linearly) stable wormholes supported by
positive-energy matt... | [
{
"created": "Mon, 1 Feb 2021 13:54:16 GMT",
"version": "v1"
}
] | 2021-05-05 | [
[
"Guerrero",
"Merce",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] | We consider reflection-asymmetric thin-shell wormholes within Palatini $f(\mathcal{R})$ gravity using a matching procedure of two patches of electrovacuum space-times at a hypersurface (the shell) via suitable junction conditions. The conditions for having (linearly) stable wormholes supported by positive-energy matter... |
gr-qc/9506026 | James E. Lidsey | James E. Lidsey | Wavefunctions for Highly Anisotropic Homogeneous Cosmologies | 11 pages, latex | Phys.Lett. B352 (1995) 207-213 | 10.1016/0370-2693(95)00494-6 | null | gr-qc | null | The canonical quantization of homogeneous cosmologies is considered in the
high anisotropic limit. Exact wavefunctions are found in this limit when the
momentum constraints are reduced at the classical level. Lorentzian solutions
that represent tunnelling from classically forbidden regimes are identified.
Solutions t... | [
{
"created": "Thu, 15 Jun 1995 13:05:09 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lidsey",
"James E.",
""
]
] | The canonical quantization of homogeneous cosmologies is considered in the high anisotropic limit. Exact wavefunctions are found in this limit when the momentum constraints are reduced at the classical level. Lorentzian solutions that represent tunnelling from classically forbidden regimes are identified. Solutions to ... |
2107.12953 | Salah Nasri | Hemza Azri and Salah Nasri | Dynamical aspects of asymmetric Eddington gravity with scalar fields | null | Phys. Rev. D 104, 064028 (2021) | 10.1103/PhysRevD.104.064028 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Eddington gravity, the action principle involves only the symmetric parts
of the connection and the Ricci tensor, with a metric that emerges
proportionally to the latter. Here, we relax this symmetric character, prolong
the action with the antisymmetric parts of the Ricci term, and allow for
various couplings with... | [
{
"created": "Tue, 27 Jul 2021 17:15:08 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2021 17:20:36 GMT",
"version": "v2"
}
] | 2021-09-10 | [
[
"Azri",
"Hemza",
""
],
[
"Nasri",
"Salah",
""
]
] | In Eddington gravity, the action principle involves only the symmetric parts of the connection and the Ricci tensor, with a metric that emerges proportionally to the latter. Here, we relax this symmetric character, prolong the action with the antisymmetric parts of the Ricci term, and allow for various couplings with s... |
1011.4772 | Jaume Haro | Jaume Haro | Topics in Quantum Field Theory in Curved Space | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these lectures we consider some topics of Quantum Field Theory in Curved
Space. In the first one particle creation in curved space is studied from a
mathematical point of view, especially, particle production at a given time
using the so called "instantaneous diagonalization method". Particle production
by strong ... | [
{
"created": "Mon, 22 Nov 2010 11:10:31 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2011 15:54:14 GMT",
"version": "v2"
}
] | 2011-02-07 | [
[
"Haro",
"Jaume",
""
]
] | In these lectures we consider some topics of Quantum Field Theory in Curved Space. In the first one particle creation in curved space is studied from a mathematical point of view, especially, particle production at a given time using the so called "instantaneous diagonalization method". Particle production by strong el... |
1412.8282 | Mustapha Azreg-A\"inou | Mustapha Azreg-A\"inou | Confined-exotic-matter wormholes with no gluing effects -- Imaging
supermassive wormholes and black holes | 14 pages, 7 figures. Extended version. To appear in JCAP | JCAP07(2015)037 | 10.1088/1475-7516/2015/07/037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We classify wormholes endowed with redshift effects and finite mass into
three types. Type I wormholes have their radial pressure dying out faster, as
one moves away from the throat, than any other component of the stress-energy
and thus violate the least the local energy conditions. In type II (resp. III)
wormholes ... | [
{
"created": "Mon, 29 Dec 2014 08:52:02 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2015 11:56:44 GMT",
"version": "v2"
}
] | 2015-07-27 | [
[
"Azreg-Aïnou",
"Mustapha",
""
]
] | We classify wormholes endowed with redshift effects and finite mass into three types. Type I wormholes have their radial pressure dying out faster, as one moves away from the throat, than any other component of the stress-energy and thus violate the least the local energy conditions. In type II (resp. III) wormholes th... |
2303.16590 | Parth Bambhaniya | Kauntey Acharya, Kshitij Pandey, Parth Bambhaniya, Pankaj S. Joshi and
Vishva Patel | Naked Singularity as a Possible Source of Ultra-High Energy Cosmic Rays | Calculation errors | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The source of Ultra-High Energy Cosmic Rays (UHECRs) remains one of the
greatest mysteries in astrophysics. Their possible source can be the galactic
nuclei, where the ultra-high gravity region plays a crucial role. Cosmic rays
are extremely energetic particles that travel through space with energies
exceeding $10^{2... | [
{
"created": "Wed, 29 Mar 2023 10:53:26 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2024 11:30:32 GMT",
"version": "v2"
}
] | 2024-07-18 | [
[
"Acharya",
"Kauntey",
""
],
[
"Pandey",
"Kshitij",
""
],
[
"Bambhaniya",
"Parth",
""
],
[
"Joshi",
"Pankaj S.",
""
],
[
"Patel",
"Vishva",
""
]
] | The source of Ultra-High Energy Cosmic Rays (UHECRs) remains one of the greatest mysteries in astrophysics. Their possible source can be the galactic nuclei, where the ultra-high gravity region plays a crucial role. Cosmic rays are extremely energetic particles that travel through space with energies exceeding $10^{20}... |
gr-qc/0604033 | Carlos Mendes | E. Abdalla, B. Cuadros-Melgar, A. B. Pavan, C. Molina | Stability and thermodynamics of brane black holes | 13 pages, 8 figures, published version | Nucl.Phys. B752 (2006) 40-59 | 10.1016/j.nuclphysb.2006.06.017 | null | gr-qc astro-ph hep-th | null | We consider scalar and axial gravitational perturbations of black hole
solutions in brane world scenarios. We show that perturbation dynamics is
surprisingly similar to the Schwarzschild case with strong indications that the
models are stable. Quasinormal modes and late-time tails are discussed. We also
study the the... | [
{
"created": "Fri, 7 Apr 2006 18:28:48 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Aug 2006 21:47:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Abdalla",
"E.",
""
],
[
"Cuadros-Melgar",
"B.",
""
],
[
"Pavan",
"A. B.",
""
],
[
"Molina",
"C.",
""
]
] | We consider scalar and axial gravitational perturbations of black hole solutions in brane world scenarios. We show that perturbation dynamics is surprisingly similar to the Schwarzschild case with strong indications that the models are stable. Quasinormal modes and late-time tails are discussed. We also study the therm... |
gr-qc/0701035 | Pouria Pedram | S. S. Gousheh, H. R. Sepangi, P. Pedram, M. Mirzaei | Canonical wave packets in quantum cosmology | 19 pages, 8 figures | Class.Quant.Grav.24:4377-4390,2007 | 10.1088/0264-9381/24/17/007 | null | gr-qc | null | We discuss the construction of wave packets resulting from the solutions of a
class of Wheeler-DeWitt equations in Robertson-Walker type cosmologies, for
arbitrary curvature. We show that there always exists a ``canonical initial
slope" for a given initial wave function, which optimizes some desirable
properties of t... | [
{
"created": "Fri, 5 Jan 2007 17:41:01 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2007 14:24:40 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Apr 2007 16:33:19 GMT",
"version": "v3"
},
{
"created": "Mon, 20 Aug 2007 14:22:19 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Gousheh",
"S. S.",
""
],
[
"Sepangi",
"H. R.",
""
],
[
"Pedram",
"P.",
""
],
[
"Mirzaei",
"M.",
""
]
] | We discuss the construction of wave packets resulting from the solutions of a class of Wheeler-DeWitt equations in Robertson-Walker type cosmologies, for arbitrary curvature. We show that there always exists a ``canonical initial slope" for a given initial wave function, which optimizes some desirable properties of the... |
1501.02471 | Andronikos Paliathanasis | Michael Tsamparlis, Andronikos Paliathanasis, Leonidas Karpathopoulos | Exact solutions of Bianchi I spacetimes which admit Conformal Killing
vectors | 17 pages; 3 tables; accepted for publication by Gen. Relativ. Gravit | Gen.Rel.Grav. 47 (2015) 2, 15 | 10.1007/s10714-015-1856-x | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a new method in order to classify the Bianchi I spacetimes which
admit conformal Killing vectors (CKV). The method is based on two propositions
which relate the CKVs of 1+(n-1) decomposable Riemannian spaces with the CKVs
of the (n-1) subspace and show that if 1+(n-1) space is conformally flat then
the (n-... | [
{
"created": "Sun, 11 Jan 2015 16:51:35 GMT",
"version": "v1"
}
] | 2015-02-13 | [
[
"Tsamparlis",
"Michael",
""
],
[
"Paliathanasis",
"Andronikos",
""
],
[
"Karpathopoulos",
"Leonidas",
""
]
] | We develop a new method in order to classify the Bianchi I spacetimes which admit conformal Killing vectors (CKV). The method is based on two propositions which relate the CKVs of 1+(n-1) decomposable Riemannian spaces with the CKVs of the (n-1) subspace and show that if 1+(n-1) space is conformally flat then the (n-1)... |
1612.01462 | Juan D Reyes | Alejandro Corichi, Juan D. Reyes, and Tatjana Vuka\v{s}inac | Weakly Isolated Horizons: First order actions and gauge symmetries | 42 pages, 5 figures, 1 table | null | 10.1088/1361-6382/aa631c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Isolated Horizons have played an important role in gravitational physics,
from characterization of the endpoint of black hole mergers to black hole
entropy. With an eye towards a canonical formulation we consider general
relativity in first order form. We focus on two issues: i) The role of the
internal gauge freedom... | [
{
"created": "Mon, 5 Dec 2016 18:27:54 GMT",
"version": "v1"
}
] | 2017-03-29 | [
[
"Corichi",
"Alejandro",
""
],
[
"Reyes",
"Juan D.",
""
],
[
"Vukašinac",
"Tatjana",
""
]
] | Isolated Horizons have played an important role in gravitational physics, from characterization of the endpoint of black hole mergers to black hole entropy. With an eye towards a canonical formulation we consider general relativity in first order form. We focus on two issues: i) The role of the internal gauge freedom i... |
2207.02146 | Muhammad Sharif | M. Sharif and Shazmeena Iltaf | Anisotropic Tolman V Solutions by Decoupling Approach in $f(R,T^{2})$
Gravity | 29 pages, 9 figures | Physica Scripta 97(2022)075002 | 10.1088/1402-4896/ac74f2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates the behavior of anisotropic static spheres that are
constructed by employing a minimal geometric deformation in the framework of
$f(R,T^{2})$ gravity ($T^{2}=T_{\zeta\nu}T^{\zeta\nu}$, $R$ is the Ricci scalar
and $T_{\zeta\nu}$ is the energy-momentum tensor). We consider a spherical
setup with... | [
{
"created": "Mon, 4 Jul 2022 03:15:20 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Sharif",
"M.",
""
],
[
"Iltaf",
"Shazmeena",
""
]
] | This paper investigates the behavior of anisotropic static spheres that are constructed by employing a minimal geometric deformation in the framework of $f(R,T^{2})$ gravity ($T^{2}=T_{\zeta\nu}T^{\zeta\nu}$, $R$ is the Ricci scalar and $T_{\zeta\nu}$ is the energy-momentum tensor). We consider a spherical setup with t... |
2002.08787 | Aritra Ghosh | Aditya Singh, Aritra Ghosh and Chandrasekhar Bhamidipati | Thermodynamic curvature of AdS black holes with dark energy | v3: revised version to appear in Front. Phys | null | 10.3389/fphy.2021.631471 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the effect of dark energy on the extended
thermodynamic structure and interacting microstructures of black holes in AdS,
through an analysis of thermodynamic geometry. Considering various limiting
cases of the novel equation of state obtained in charged rotating black holes
with quintessence, ... | [
{
"created": "Thu, 20 Feb 2020 15:09:15 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Apr 2020 11:22:01 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Feb 2021 07:23:41 GMT",
"version": "v3"
}
] | 2021-02-05 | [
[
"Singh",
"Aditya",
""
],
[
"Ghosh",
"Aritra",
""
],
[
"Bhamidipati",
"Chandrasekhar",
""
]
] | In this paper, we study the effect of dark energy on the extended thermodynamic structure and interacting microstructures of black holes in AdS, through an analysis of thermodynamic geometry. Considering various limiting cases of the novel equation of state obtained in charged rotating black holes with quintessence, an... |
0912.4907 | John W. Barrett | John W. Barrett, Winston J. Fairbairn, Frank Hellmann | Quantum gravity asymptotics from the SU(2) 15j symbol | approx 17 pages | null | 10.1142/S0217751X10049281 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The asymptotics of the SU(2) 15j symbol are obtained using coherent states
for the boundary data. The geometry of all non-suppressed boundary data is
given. For some boundary data, the resulting formula is interpreted in terms of
the Regge action of the geometry of a 4-simplex in 4-dimensional Euclidean
space. This a... | [
{
"created": "Thu, 24 Dec 2009 20:08:41 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Barrett",
"John W.",
""
],
[
"Fairbairn",
"Winston J.",
""
],
[
"Hellmann",
"Frank",
""
]
] | The asymptotics of the SU(2) 15j symbol are obtained using coherent states for the boundary data. The geometry of all non-suppressed boundary data is given. For some boundary data, the resulting formula is interpreted in terms of the Regge action of the geometry of a 4-simplex in 4-dimensional Euclidean space. This asy... |
gr-qc/9609047 | null | M. Sawaguchi and C.-B. Kim | Reality conditions for (2+1)-dimensional gravity coupled with the Dirac
field | 13 pages, latex | Class.Quant.Grav. 14 (1997) 905-913 | 10.1088/0264-9381/14/4/008 | STUPP-96-148 | gr-qc | null | The canonical formalism of three dimensional gravity coupled with the Dirac
field is considered. We introduce complex variables to simplify the Dirac
brackets of canonical variables and examine the canonical structure of the
theory. We discuss the reality conditions which guarantee the equivalence
between the complex... | [
{
"created": "Thu, 19 Sep 1996 09:55:36 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Sawaguchi",
"M.",
""
],
[
"Kim",
"C. -B.",
""
]
] | The canonical formalism of three dimensional gravity coupled with the Dirac field is considered. We introduce complex variables to simplify the Dirac brackets of canonical variables and examine the canonical structure of the theory. We discuss the reality conditions which guarantee the equivalence between the complex a... |
1612.05263 | Davide Gerosa | Davide Gerosa, Ulrich Sperhake, Jakub Vo\v{s}mera | On the equal-mass limit of precessing black-hole binaries | 13 pages, 1 figure, accepted for publication in CQG | Class. Quantum Grav. 34, 6, 064004 (2017) | 10.1088/1361-6382/aa5e58 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the inspiral dynamics of equal-mass precessing black-hole binaries
using multi-timescale techniques. The orbit-averaged post-Newtonian
evolutionary equations admit two constants of motion in the equal-mass limit,
namely the magnitude of the total spin $S$ and the effective spin $\xi$. This
feature makes th... | [
{
"created": "Thu, 15 Dec 2016 21:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2017 20:03:44 GMT",
"version": "v2"
}
] | 2017-03-06 | [
[
"Gerosa",
"Davide",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Vošmera",
"Jakub",
""
]
] | We analyze the inspiral dynamics of equal-mass precessing black-hole binaries using multi-timescale techniques. The orbit-averaged post-Newtonian evolutionary equations admit two constants of motion in the equal-mass limit, namely the magnitude of the total spin $S$ and the effective spin $\xi$. This feature makes the ... |
0710.2667 | Volker Perlick | Volker Perlick | On the generalized Jacobi equation | Contribution to Mashhoon Festschrift (Special Issue of Gen. Rel.
Grav.). 17 pages, 2 figures | Gen.Rel.Grav.40:1029-1045,2008 | 10.1007/s10714-007-0589-x | null | gr-qc | null | The standard text-book Jacobi equation (equation of geodesic deviation)
arises by linearizing the geodesic equation around some chosen geodesic, where
the linearization is done with respect to the coordinates and the velocities.
The generalized Jacobi equation, introduced by Hodgkinson in 1972 and further
developed b... | [
{
"created": "Sun, 14 Oct 2007 14:18:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Perlick",
"Volker",
""
]
] | The standard text-book Jacobi equation (equation of geodesic deviation) arises by linearizing the geodesic equation around some chosen geodesic, where the linearization is done with respect to the coordinates and the velocities. The generalized Jacobi equation, introduced by Hodgkinson in 1972 and further developed by ... |
gr-qc/0304055 | Guillermo A. Mena Marugan | Luis J. Garay and Guillermo A. Mena Marugan | Immirzi Ambiguity, Boosts and Conformal Frames for Black Holes | 8 pages, accepted for publication in Classical and Quantum Gravity | null | 10.1088/0264-9381/20/8/103 | null | gr-qc | null | We analyze changes of the Immirzi parameter in loop quantum gravity and
compare their consequences with those of Lorentz boosts and constant conformal
transformations in black hole physics. We show that the effective value deduced
for the Planck length in local measurements of vacuum black holes by an
asymptotic obse... | [
{
"created": "Tue, 15 Apr 2003 09:36:03 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Garay",
"Luis J.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | We analyze changes of the Immirzi parameter in loop quantum gravity and compare their consequences with those of Lorentz boosts and constant conformal transformations in black hole physics. We show that the effective value deduced for the Planck length in local measurements of vacuum black holes by an asymptotic observ... |
2301.03504 | Juan M. Z\'arate Pretel | Juan M. Z. Pretel | Radial pulsations, moment of inertia and tidal deformability of dark
energy stars | 15 pages, 9 figures and 2 tables. Accepted for publication in
European Physical Journal C | Eur. Phys. J. C 83 (2023) 26 | 10.1140/epjc/s10052-023-11198-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct dark energy stars with Chaplygin-type equation of state (EoS) in
the presence of anisotropic pressure within the framework of Einstein gravity.
From the classification established by Iyer et al. [Class. Quantum Grav. 2, 219
(1985)], we discuss the possible existence of isotropic dark energy stars as
comp... | [
{
"created": "Mon, 9 Jan 2023 16:54:41 GMT",
"version": "v1"
}
] | 2023-01-18 | [
[
"Pretel",
"Juan M. Z.",
""
]
] | We construct dark energy stars with Chaplygin-type equation of state (EoS) in the presence of anisotropic pressure within the framework of Einstein gravity. From the classification established by Iyer et al. [Class. Quantum Grav. 2, 219 (1985)], we discuss the possible existence of isotropic dark energy stars as compac... |
1111.2795 | Jack Gegenberg | Jack Gegenberg, Gabor Kunstatter and Timothy Taves | Quantum Mechanics of the Interior of Radiating 2-D Black Holes | null | null | 10.1103/PhysRevD.85.024025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the homogeneous sector of the RST model describing the gravitational
dynamics, including back-reaction, of radiating 2-d black holes. We find the
exact solutions both in conformal gauge and in time-parametrized form, isolate
the black hole sector of the classical phase space and quantize the near
singularity... | [
{
"created": "Fri, 11 Nov 2011 16:41:51 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2012 22:36:36 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Gegenberg",
"Jack",
""
],
[
"Kunstatter",
"Gabor",
""
],
[
"Taves",
"Timothy",
""
]
] | We study the homogeneous sector of the RST model describing the gravitational dynamics, including back-reaction, of radiating 2-d black holes. We find the exact solutions both in conformal gauge and in time-parametrized form, isolate the black hole sector of the classical phase space and quantize the near singularity d... |
0710.3435 | Andrew Moylan | Andrew Moylan | Numerical experimentation within GRworkbench | Honours thesis (ANU, 2003) | null | null | null | gr-qc | null | The software tool GRworkbench is an ongoing project in visual, numerical
General Relativity at The Australian National University. This year,
GRworkbench has been significantly extended to facilitate numerical
experimentation. The numerical differential geometric engine has been rewritten
using functional programming... | [
{
"created": "Thu, 18 Oct 2007 04:33:30 GMT",
"version": "v1"
}
] | 2007-10-19 | [
[
"Moylan",
"Andrew",
""
]
] | The software tool GRworkbench is an ongoing project in visual, numerical General Relativity at The Australian National University. This year, GRworkbench has been significantly extended to facilitate numerical experimentation. The numerical differential geometric engine has been rewritten using functional programming t... |
1911.02484 | Geanderson Carvalho Dr. | G.A. Carvalho, S.I. dos Santos, Jr., P.H.R.S. Moraes, M. Malheiro | Strange stars in energy-momentum-conserved $f(R,T)$ gravity | preprint version with 14 pages and 3 figures. arXiv admin note: text
overlap with arXiv:1803.07719 | null | null | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the accurate understanding of compact objects such as neutron stars and
strange stars, the Tolmann-Openheimer-Volkof (TOV) equation has proved to be of
great use. Hence, in this work, we obtain the TOV equation for the
energy-momentum-conserved $f(R,T)$ theory of gravity to study strange quark
stars. The $f(R,T)$... | [
{
"created": "Tue, 5 Nov 2019 17:32:26 GMT",
"version": "v1"
}
] | 2019-11-07 | [
[
"Carvalho",
"G. A.",
""
],
[
"Santos,",
"S. I. dos",
"Jr."
],
[
"Moraes",
"P. H. R. S.",
""
],
[
"Malheiro",
"M.",
""
]
] | For the accurate understanding of compact objects such as neutron stars and strange stars, the Tolmann-Openheimer-Volkof (TOV) equation has proved to be of great use. Hence, in this work, we obtain the TOV equation for the energy-momentum-conserved $f(R,T)$ theory of gravity to study strange quark stars. The $f(R,T)$ t... |
1003.0561 | Tomas Ledvinka | Tomas Ledvinka, Gerhard Schaefer, Jiri Bicak | Post-Minkowskian closed-form Hamiltonian for gravitating N-body systems | 3 pages, to appear in the proceedings of the 12th Marcel Grossmann
Meeting, Paris, July 2009 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hamiltonian for a system of relativistic bodies interacting by their
gravitational field is found in the post-Minkowskian approximation, including
all terms linear in the gravitational constant. It is given in a surprisingly
simple closed form as a function of canonical variables describing the bodies
only. The f... | [
{
"created": "Tue, 2 Mar 2010 11:28:19 GMT",
"version": "v1"
}
] | 2010-03-03 | [
[
"Ledvinka",
"Tomas",
""
],
[
"Schaefer",
"Gerhard",
""
],
[
"Bicak",
"Jiri",
""
]
] | The Hamiltonian for a system of relativistic bodies interacting by their gravitational field is found in the post-Minkowskian approximation, including all terms linear in the gravitational constant. It is given in a surprisingly simple closed form as a function of canonical variables describing the bodies only. The fie... |
gr-qc/9406027 | Peter Schaller | P.Schaller and T.Strobl | Quantization of Field Theories Generalizing Gravity-Yang-Mills Systems
on the Cylinder | 26, pages, TUW-94-2 | Lect.Notes Phys. 436 (1994) 98-122 | 10.1007/3-540-58453-6_6 | null | gr-qc | null | Pure gravity and gauge theories in two dimensions are shown to be special
cases of a much more general class of field theories each of which is
characterized by a Poisson structure on a finite dimensional target space. A
general scheme for the quantization of these theories is formulated. Explicit
examples are studie... | [
{
"created": "Thu, 16 Jun 1994 17:55:16 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Schaller",
"P.",
""
],
[
"Strobl",
"T.",
""
]
] | Pure gravity and gauge theories in two dimensions are shown to be special cases of a much more general class of field theories each of which is characterized by a Poisson structure on a finite dimensional target space. A general scheme for the quantization of these theories is formulated. Explicit examples are studied ... |
gr-qc/9406046 | Ahmed Hindawi | F. I. Mikhail, M. I. Wanas, Ahmed Hindawi, and E. I. Lashin | Energy-Momentum Complex in M\o ller's Tetrad Theory of Gravitation | LaTeX2e with AMS-LaTeX 1.2, 13 pages | Int.J.Theor.Phys.32:1627-1642,1993 | 10.1007/BF00672861 | IC/91/209 | gr-qc | null | M\o ller's Tetrad Theory of Gravitation is examined with regard to the
energy-momentum complex. The energy-momentum complex as well as the
superpotential associated with M\o ller's theory are derived. M\o ller's field
equations are solved in the case of spherical symmetry. Two different
solutions, giving rise to the ... | [
{
"created": "Tue, 28 Jun 1994 08:48:53 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Nov 1995 20:54:16 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Feb 1996 03:26:04 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Mikhail",
"F. I.",
""
],
[
"Wanas",
"M. I.",
""
],
[
"Hindawi",
"Ahmed",
""
],
[
"Lashin",
"E. I.",
""
]
] | M\o ller's Tetrad Theory of Gravitation is examined with regard to the energy-momentum complex. The energy-momentum complex as well as the superpotential associated with M\o ller's theory are derived. M\o ller's field equations are solved in the case of spherical symmetry. Two different solutions, giving rise to the sa... |
2407.01228 | Marcos Leopoldo Wayhs Basso | Marcos L. W. Basso and Vilson T. Zanchin | Kerr-Newman outside a rotating de Sitter-type core: A rotating version
of the Lemos-Zanchin electrically charged solution | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A rotating version of the electrically charged solution of the
Einstein-Maxwell system of equations modeling static regular black holes by
Lemos and Zanchin [Phys. Rev. D 83, 124005 (2011)] is obtained in the present
work. The full rotating geometry consists of the Kerr-Newman exterior geometry
outside a rotating de ... | [
{
"created": "Mon, 1 Jul 2024 12:18:59 GMT",
"version": "v1"
}
] | 2024-07-02 | [
[
"Basso",
"Marcos L. W.",
""
],
[
"Zanchin",
"Vilson T.",
""
]
] | A rotating version of the electrically charged solution of the Einstein-Maxwell system of equations modeling static regular black holes by Lemos and Zanchin [Phys. Rev. D 83, 124005 (2011)] is obtained in the present work. The full rotating geometry consists of the Kerr-Newman exterior geometry outside a rotating de Si... |
1402.3290 | Ronald Adler | Ronald J. Adler | On a digital quantum description of physical space versus the continuum
description | 17 pages, 3 figures | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The continuum of real numbers has served well as a model for physical space
in mechanics and field theories. However it is a well-motivated and popular
idea that at the fundamental Planck scale the combination of gravitational and
quantum effects forces us to re-evaluate the concept of space (and time), and
some sort... | [
{
"created": "Thu, 13 Feb 2014 00:31:35 GMT",
"version": "v1"
}
] | 2014-02-17 | [
[
"Adler",
"Ronald J.",
""
]
] | The continuum of real numbers has served well as a model for physical space in mechanics and field theories. However it is a well-motivated and popular idea that at the fundamental Planck scale the combination of gravitational and quantum effects forces us to re-evaluate the concept of space (and time), and some sort o... |
gr-qc/9909065 | Doc. Ing. Jozef Sima DRSc. | Miroslav Sukenik and Jozef Sima | An alternative method for calculating the energy of gravitational waves | 4 pages, LaTex | null | null | SS-99-02 | gr-qc | null | In the expansive nondecelerative universe model, creation of matter occurs
due to which the Vaidya metrics is applied. This fact allows for localizing
gravitational energy and calculating the energy of gravitational waves using an
approach alternative to the well established procedure based on quadrupole
formula. Rat... | [
{
"created": "Tue, 21 Sep 1999 14:39:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sukenik",
"Miroslav",
""
],
[
"Sima",
"Jozef",
""
]
] | In the expansive nondecelerative universe model, creation of matter occurs due to which the Vaidya metrics is applied. This fact allows for localizing gravitational energy and calculating the energy of gravitational waves using an approach alternative to the well established procedure based on quadrupole formula. Ratio... |
gr-qc/9604012 | Adrian Kent | Adrian Kent (DAMTP, University of Cambridge) | Consistent Sets Yield Contrary Inferences in Quantum Theory | 10 pages, TeX with harvmac. Revised version, with extended discussion
and references added. To appear in Phys. Rev. Lett | Phys.Rev.Lett.78:2874-2877,1997 | 10.1103/PhysRevLett.78.2874 | DAMTP/96-18 (revised) | gr-qc cond-mat hep-th quant-ph | null | In the consistent histories formulation of quantum theory, the probabilistic
predictions and retrodictions made from observed data depend on the choice of a
consistent set. We show that this freedom allows the formalism to retrodict
contrary propositions which correspond to orthogonal commuting projections and
which ... | [
{
"created": "Thu, 4 Apr 1996 21:12:37 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Mar 1997 18:04:56 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Kent",
"Adrian",
"",
"DAMTP, University of Cambridge"
]
] | In the consistent histories formulation of quantum theory, the probabilistic predictions and retrodictions made from observed data depend on the choice of a consistent set. We show that this freedom allows the formalism to retrodict contrary propositions which correspond to orthogonal commuting projections and which ea... |
2406.07691 | Poulami Dutta Roy | Poulami Dutta Roy, Sayantani Datta, K. G. Arun | Tests of general relativity at the fourth post-Newtonian order | 11 pages, 2 figures, 2 tables | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The recently computed post-Newtonian (PN) gravitational-wave phasing up to
4.5PN order accounts for several novel physical effects in compact binary
dynamics such as the {\it tail of the memory, tails of tails of tails and tails
of mass hexadecupole and current octupole moments}. Therefore, it is
instructive to asses... | [
{
"created": "Tue, 11 Jun 2024 20:11:35 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Roy",
"Poulami Dutta",
""
],
[
"Datta",
"Sayantani",
""
],
[
"Arun",
"K. G.",
""
]
] | The recently computed post-Newtonian (PN) gravitational-wave phasing up to 4.5PN order accounts for several novel physical effects in compact binary dynamics such as the {\it tail of the memory, tails of tails of tails and tails of mass hexadecupole and current octupole moments}. Therefore, it is instructive to assess ... |
2104.08703 | Qingyu Gan | Qingyu Gan, Peng Wang, Houwen Wu, Haitang Yang | Photon Spheres and Spherical Accretion Image of a Hairy Black Hole | v1: 13 pages, 6 figures; v2: 13 pages, 6 figures, references added | Phys. Rev. D 104, 024003 (2021) | 10.1103/PhysRevD.104.024003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we first consider null geodesics of a class of charged,
spherical and asymptotically flat hairy black holes in an
Einstein-Maxwell-scalar theory with a non-minimal coupling for the scalar and
electromagnetic fields. Remarkably, we show that there are two unstable
circular orbits for a photon in a certa... | [
{
"created": "Sun, 18 Apr 2021 04:02:16 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2021 14:38:52 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Gan",
"Qingyu",
""
],
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
],
[
"Yang",
"Haitang",
""
]
] | In this paper, we first consider null geodesics of a class of charged, spherical and asymptotically flat hairy black holes in an Einstein-Maxwell-scalar theory with a non-minimal coupling for the scalar and electromagnetic fields. Remarkably, we show that there are two unstable circular orbits for a photon in a certain... |
1811.12923 | Yury F. Pirogov | Yury F. Pirogov | Quartet-metric/multi-component gravity: scalar graviton as emergent dark
substance | 16 pages, 2 figures. Minor revision, references added | JCAP01(2019)055 | 10.1088/1475-7516/2019/01/055 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the general frameworks of an earlier introduced
quartet-metric/multi-component gravity, a theory of a massive scalar graviton
supplementing the massless tensor one is consistently deduced. The
peculiarities of the scalar-graviton field compared to the canonical scalar one
are demonstrated. The light scalar gravito... | [
{
"created": "Fri, 30 Nov 2018 18:15:37 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2019 17:55:26 GMT",
"version": "v2"
}
] | 2019-02-13 | [
[
"Pirogov",
"Yury F.",
""
]
] | In the general frameworks of an earlier introduced quartet-metric/multi-component gravity, a theory of a massive scalar graviton supplementing the massless tensor one is consistently deduced. The peculiarities of the scalar-graviton field compared to the canonical scalar one are demonstrated. The light scalar graviton ... |
2306.17577 | Hai-Long Huang | Hai-Long Huang, Yong Cai, Jun-Qian Jiang, Jun Zhang and Yun-Song Piao | Supermassive primordial black holes in multiverse: for nano-Hertz
gravitational wave and high-redshift JWST galaxies | 15 pages, 4 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, observational hints for supermassive black holes have been
accumulating, which has inspired ones to wonder: Can primordial black holes
(PBHs) be supermassive, in particular with the mass $M\gtrsim 10^{9}M_\odot$? A
supercritical bubble (with an inflating baby universe inside it) that nucleated
during inflat... | [
{
"created": "Fri, 30 Jun 2023 11:54:50 GMT",
"version": "v1"
}
] | 2023-07-03 | [
[
"Huang",
"Hai-Long",
""
],
[
"Cai",
"Yong",
""
],
[
"Jiang",
"Jun-Qian",
""
],
[
"Zhang",
"Jun",
""
],
[
"Piao",
"Yun-Song",
""
]
] | Recently, observational hints for supermassive black holes have been accumulating, which has inspired ones to wonder: Can primordial black holes (PBHs) be supermassive, in particular with the mass $M\gtrsim 10^{9}M_\odot$? A supercritical bubble (with an inflating baby universe inside it) that nucleated during inflatio... |
1108.0061 | Rodrigo P. Macedo | Jos\'e Luis Jaramillo and Rodrigo P. Macedo and Philipp Moesta and
Luciano Rezzolla | Black-hole horizons as probes of black-hole dynamics II: geometrical
insights | Final version published on PRD | Phys. Rev. D 85, 084031 (2012) | 10.1103/PhysRevD.85.084031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a companion paper [1], we have presented a cross-correlation approach to
near-horizon physics in which bulk dynamics is probed through the correlation
of quantities defined at inner and outer spacetime hypersurfaces acting as test
screens. More specifically, dynamical horizons provide appropriate inner
screens in ... | [
{
"created": "Sat, 30 Jul 2011 11:28:38 GMT",
"version": "v1"
},
{
"created": "Sat, 5 May 2012 13:44:43 GMT",
"version": "v2"
}
] | 2012-05-08 | [
[
"Jaramillo",
"José Luis",
""
],
[
"Macedo",
"Rodrigo P.",
""
],
[
"Moesta",
"Philipp",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | In a companion paper [1], we have presented a cross-correlation approach to near-horizon physics in which bulk dynamics is probed through the correlation of quantities defined at inner and outer spacetime hypersurfaces acting as test screens. More specifically, dynamical horizons provide appropriate inner screens in a ... |
gr-qc/0512056 | Alfred Scharff Goldhaber | Alfred Scharff Goldhaber | Magnetic Monopoles and Cosmic Inflation | 10 pages | null | null | YITP-SB-05-45 | gr-qc | null | It is possible that the expansion of the universe began with an inflationary
phase, in which the inflaton driving the process also was a Higgs field capable
of stabilizing magnetic monopoles in a grand-unified gauge theory. If so, then
the smallness of intensity fluctuations observed in the cosmic microwave
backgroun... | [
{
"created": "Fri, 9 Dec 2005 18:37:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goldhaber",
"Alfred Scharff",
""
]
] | It is possible that the expansion of the universe began with an inflationary phase, in which the inflaton driving the process also was a Higgs field capable of stabilizing magnetic monopoles in a grand-unified gauge theory. If so, then the smallness of intensity fluctuations observed in the cosmic microwave background ... |
1709.07236 | Juho Lankinen | Juho Lankinen and Iiro Vilja | Decay of a Massive Particle in a Stiff Matter Dominated Universe | 6 pages, 1 figure | Phys. Rev. D 96, 105026 (2017) | 10.1103/PhysRevD.96.105026 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of a gravitational field decay rates may significantly differ
from flat space equivalent. By studying mutually interacting quantum fields the
decay rates can be calculated on a given spacetime. This paper presents the
calculation of the transition probability for the decay of a massive scalar
particle... | [
{
"created": "Thu, 21 Sep 2017 09:48:26 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2017 08:23:19 GMT",
"version": "v2"
}
] | 2017-12-06 | [
[
"Lankinen",
"Juho",
""
],
[
"Vilja",
"Iiro",
""
]
] | In the presence of a gravitational field decay rates may significantly differ from flat space equivalent. By studying mutually interacting quantum fields the decay rates can be calculated on a given spacetime. This paper presents the calculation of the transition probability for the decay of a massive scalar particle i... |
0905.0450 | Frank Ohme | Frank Ohme, Mark Hannam, Sascha Husa and Niall \'O Murchadha | Stationary hyperboloidal slicings with evolved gauge conditions | 18 pages, 11 figures, LaTeX; minor changes for the published version | 2009 Class. Quantum Grav. 26 175014 | 10.1088/0264-9381/26/17/175014 | AEI-2009-043 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze stationary slicings of the Schwarzschild spacetime defined by
members of the Bona-Masso family of slicing conditions. Our main focus is on
the influence of a non-vanishing offset to the extrinsic curvature, which
forbids the existence of standard Cauchy foliations but at the same time allows
gauge choices ... | [
{
"created": "Mon, 4 May 2009 19:58:18 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2009 08:01:01 GMT",
"version": "v2"
}
] | 2009-08-20 | [
[
"Ohme",
"Frank",
""
],
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Murchadha",
"Niall Ó",
""
]
] | We analyze stationary slicings of the Schwarzschild spacetime defined by members of the Bona-Masso family of slicing conditions. Our main focus is on the influence of a non-vanishing offset to the extrinsic curvature, which forbids the existence of standard Cauchy foliations but at the same time allows gauge choices th... |
1606.08073 | Saeed Rastgoo | Saeed Rastgoo, Manfred Requardt | Emergent Space-Time via a Geometric Renormalization Method | 29 pages, v2 matching the published PRD version | Phys. Rev. D 94, 124019 (2016) | 10.1103/PhysRevD.94.124019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a purely geometric renormalization scheme for metric spaces
(including uncolored graphs), which consists of a coarse graining and a
rescaling operation on such spaces. The coarse graining is based on the concept
of quasi-isometry, which yields a sequence of discrete coarse grained spaces
each having a cont... | [
{
"created": "Sun, 26 Jun 2016 19:14:42 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 23:28:36 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Rastgoo",
"Saeed",
""
],
[
"Requardt",
"Manfred",
""
]
] | We present a purely geometric renormalization scheme for metric spaces (including uncolored graphs), which consists of a coarse graining and a rescaling operation on such spaces. The coarse graining is based on the concept of quasi-isometry, which yields a sequence of discrete coarse grained spaces each having a contin... |
gr-qc/0412082 | Pankaj S. Joshi | Pankaj S Joshi | Gravitational Collapse End States | 6 pages, Invited talk at `International workshop on dynamics and
thermodynamics of black holes and naked singularities', 13-15 May, Milano | null | null | null | gr-qc | null | Recent developments on the final state of a gravitationally collapsing
massive matter cloud are summarized and reviewed here. After a brief background
on the problem, we point out how the black hole and naked singularity end
states arise naturally in spherical collapse. We see that it is the geometry of
trapped surfa... | [
{
"created": "Fri, 17 Dec 2004 11:21:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Joshi",
"Pankaj S",
""
]
] | Recent developments on the final state of a gravitationally collapsing massive matter cloud are summarized and reviewed here. After a brief background on the problem, we point out how the black hole and naked singularity end states arise naturally in spherical collapse. We see that it is the geometry of trapped surface... |
1202.2755 | Norman G\"urlebeck | D. Lynden-Bell, J. Bi\v{c}\'ak, J. Katz | On Fast Linear Gravitational Dragging | 4 pages, 1 figure | Class. Quantum Grav. 29 (2012) 017001 | 10.1088/0264-9381/29/1/017001 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new formula is given for the fast linear gravitational dragging of the
inertial frame within a rapidly accelerated spherical shell of deep potential.
The shell is charged and is electrically accelerated by an electric field whose
sources are included in the solution.
| [
{
"created": "Mon, 13 Feb 2012 14:51:40 GMT",
"version": "v1"
}
] | 2012-02-14 | [
[
"Lynden-Bell",
"D.",
""
],
[
"Bičák",
"J.",
""
],
[
"Katz",
"J.",
""
]
] | A new formula is given for the fast linear gravitational dragging of the inertial frame within a rapidly accelerated spherical shell of deep potential. The shell is charged and is electrically accelerated by an electric field whose sources are included in the solution. |
1701.06636 | Tao Wang | Yun-Chao Wang, Tower Wang | Primordial perturbations generated by Higgs field and $R^2$ operator | 14 pages, 5 figures, $\rho$-field redefined, Sect V and appendices
enlarged | Phys. Rev. D 96, 123506 (2017) | 10.1103/PhysRevD.96.123506 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the very early Universe is dominated by the non-minimally coupled Higgs
field and Starobinsky's curvature-squared term together, the potential diagram
would mimic the landscape of a valley, serving as a cosmological attractor. The
inflationary dynamics along this valley is studied, model parameters are
constrained... | [
{
"created": "Mon, 23 Jan 2017 21:18:35 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jun 2017 04:30:00 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Dec 2017 01:51:28 GMT",
"version": "v3"
}
] | 2017-12-13 | [
[
"Wang",
"Yun-Chao",
""
],
[
"Wang",
"Tower",
""
]
] | If the very early Universe is dominated by the non-minimally coupled Higgs field and Starobinsky's curvature-squared term together, the potential diagram would mimic the landscape of a valley, serving as a cosmological attractor. The inflationary dynamics along this valley is studied, model parameters are constrained a... |
2309.04368 | Gabriele Bozzola | Gabriele Bozzola and Vasileios Paschalidis | Can quasi-circular mergers of charged black holes produce extremal black
holes? | 7 pages, 2 figures, code available | Phys. Rev. D 108, 064010 (2023) | 10.1103/PhysRevD.108.064010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In contrast to energy and angular momentum, electric charge is conserved in
mergers of charged black holes. This opens up the possibility for the remnant
to have Kerr-Newman parameter $\chi^{2} + \lambda^{2}$ greater than 1 (with
$\chi$ and $\lambda$ being the black hole dimensionless spin and dimensionless
charge, r... | [
{
"created": "Fri, 8 Sep 2023 14:58:16 GMT",
"version": "v1"
}
] | 2023-09-11 | [
[
"Bozzola",
"Gabriele",
""
],
[
"Paschalidis",
"Vasileios",
""
]
] | In contrast to energy and angular momentum, electric charge is conserved in mergers of charged black holes. This opens up the possibility for the remnant to have Kerr-Newman parameter $\chi^{2} + \lambda^{2}$ greater than 1 (with $\chi$ and $\lambda$ being the black hole dimensionless spin and dimensionless charge, res... |
2204.02979 | Hossein Ghaffarnejad | Elham Ghasemi and Hossein Ghaffarnejad | Magnetic charge effects on thermodynamic phase transition of modified
Anti de Sitter Ay\'{o}n-Beato-Garc\'{i}a Black Holes with five parameters | 10 pages, 3 figures, virtually presented as invited speaker at the
1th International conference of Holography and its Applications, 9-10 March
2022, School of Physics, Damghan University, Damghan, IRAN | Journal of Holography Applications in Physics(2022) | 10.22128/jhap.2022.524.1022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we choose generalized Ayon Beato Gracia (ABG) magnetic charged
black hole with five parameters to investigate possibility of thermodynamic
phase transition and coexistence of different gass/liquid/solid phases of this
black hole. In fact this work is an extension of our recently work where ABG
black ho... | [
{
"created": "Wed, 6 Apr 2022 22:23:51 GMT",
"version": "v1"
}
] | 2022-05-10 | [
[
"Ghasemi",
"Elham",
""
],
[
"Ghaffarnejad",
"Hossein",
""
]
] | In this letter we choose generalized Ayon Beato Gracia (ABG) magnetic charged black hole with five parameters to investigate possibility of thermodynamic phase transition and coexistence of different gass/liquid/solid phases of this black hole. In fact this work is an extension of our recently work where ABG black hole... |
1306.3246 | Marc Geiller | Jibril Ben Achour, Marc Geiller, Karim Noui, Chao Yu | Spectra of geometric operators in three-dimensional LQG: From discrete
to continuous | 13 pages. 2 figures | Phys. Rev. D 89, 064064 (2014) | 10.1103/PhysRevD.89.064064 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study and compare the spectra of geometric operators (length and area) in
the quantum kinematics of two formulations of three-dimensional Lorentzian loop
quantum gravity. In the SU(2) Ashtekar-Barbero framework, the spectra are
discrete and depend on the Barbero-Immirzi parameter $\gamma$ exactly like in
the four-... | [
{
"created": "Thu, 13 Jun 2013 20:10:43 GMT",
"version": "v1"
}
] | 2014-05-07 | [
[
"Achour",
"Jibril Ben",
""
],
[
"Geiller",
"Marc",
""
],
[
"Noui",
"Karim",
""
],
[
"Yu",
"Chao",
""
]
] | We study and compare the spectra of geometric operators (length and area) in the quantum kinematics of two formulations of three-dimensional Lorentzian loop quantum gravity. In the SU(2) Ashtekar-Barbero framework, the spectra are discrete and depend on the Barbero-Immirzi parameter $\gamma$ exactly like in the four-di... |
0907.0760 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig, Farook Rahaman, Ashis Ghosh | Quintom wormholes | 8 pages, 3 figures | Int.J.Theor.Phys.49:1222-1231,2010 | 10.1007/s10773-010-0302-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The combination of quintessence and phantom energy in a joint model is
referred to as quintom dark energy. This paper discusses traversable wormholes
supported by such quintom matter. Two particular solutions are explored, a
constant redshift function and a specific shape function. Both isotropic and
anisotropic pres... | [
{
"created": "Sat, 4 Jul 2009 14:02:23 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jun 2010 21:29:22 GMT",
"version": "v2"
}
] | 2010-06-15 | [
[
"Kuhfittig",
"Peter K. F.",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Ghosh",
"Ashis",
""
]
] | The combination of quintessence and phantom energy in a joint model is referred to as quintom dark energy. This paper discusses traversable wormholes supported by such quintom matter. Two particular solutions are explored, a constant redshift function and a specific shape function. Both isotropic and anisotropic pressu... |
0807.2051 | Sa\v{s}a Iliji\'c | Dubravko Horvat, Sasa Ilijic, Anja Marunovic | Electrically charged gravastar configurations | LaTeX, 14 pages, 3 figs, changes wrt v1: discussion of emergent
equation of state included and references updated (to appear in CQG) | Class.Quant.Grav.26:025003,2009 | 10.1088/0264-9381/26/2/025003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notion of a compact object immune to the horizon problem and comprising
an anisotropic inhomogeneous fluid with a specific radial pressure behavior,
i.e. the gravastar, is extended by introducing an electrically charged
component. Einstein-Maxwell field equations are solved in the asymptotically de
Sitter interio... | [
{
"created": "Sun, 13 Jul 2008 18:38:06 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Dec 2008 08:49:45 GMT",
"version": "v2"
}
] | 2009-01-16 | [
[
"Horvat",
"Dubravko",
""
],
[
"Ilijic",
"Sasa",
""
],
[
"Marunovic",
"Anja",
""
]
] | The notion of a compact object immune to the horizon problem and comprising an anisotropic inhomogeneous fluid with a specific radial pressure behavior, i.e. the gravastar, is extended by introducing an electrically charged component. Einstein-Maxwell field equations are solved in the asymptotically de Sitter interior ... |
0712.2268 | Shinji Tsujikawa | Salvatore Capozziello, Shinji Tsujikawa | Solar system and equivalence principle constraints on f(R) gravity by
chameleon approach | 5 pages, no figures, version to appear in Physical Review D | Phys.Rev.D77:107501,2008 | 10.1103/PhysRevD.77.107501 | null | gr-qc astro-ph hep-ph hep-th | null | We study constraints on f(R) dark energy models from solar system experiments
combined with experiments on the violation of equivalence principle. When the
mass of an equivalent scalar field degree of freedom is heavy in a region with
high density, a spherically symmetric body has a thin-shell so that an
effective co... | [
{
"created": "Fri, 14 Dec 2007 00:51:42 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Mar 2008 07:49:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We study constraints on f(R) dark energy models from solar system experiments combined with experiments on the violation of equivalence principle. When the mass of an equivalent scalar field degree of freedom is heavy in a region with high density, a spherically symmetric body has a thin-shell so that an effective coup... |
gr-qc/9312022 | null | Arvind Borde and Alexander Vilenkin | Eternal inflation and the initial singularity | 11 pages, Tufts University cosmology preprint | Phys.Rev.Lett.72:3305-3309,1994 | 10.1103/PhysRevLett.72.3305 | null | gr-qc | null | It is shown that a physically reasonable spacetime that is eternally
inflating to the future must possess an initial singularity.
| [
{
"created": "Wed, 15 Dec 1993 16:41:23 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Borde",
"Arvind",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | It is shown that a physically reasonable spacetime that is eternally inflating to the future must possess an initial singularity. |
2303.18039 | Lorenzo Pompili | Lorenzo Pompili, Alessandra Buonanno, H\'ector Estell\'es, Mohammed
Khalil, Maarten van de Meent, Deyan P. Mihaylov, Serguei Ossokine, Michael
P\"urrer, Antoni Ramos-Buades, Ajit Kumar Mehta, Roberto Cotesta, Sylvain
Marsat, Michael Boyle, Lawrence E. Kidder, Harald P. Pfeiffer, Mark A.
Scheel, Hannes R. R\"ute... | Laying the foundation of the effective-one-body waveform models
SEOBNRv5: improved accuracy and efficiency for spinning non-precessing binary
black holes | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present SEOBNRv5HM, a more accurate and faster inspiral-merger-ringdown
gravitational waveform model for quasi-circular, spinning, nonprecessing binary
black holes within the effective-one-body (EOB) formalism. Compared to its
predecessor, SEOBNRv4HM, the waveform model i) incorporates recent high-order
post- Newt... | [
{
"created": "Fri, 31 Mar 2023 13:20:10 GMT",
"version": "v1"
}
] | 2023-04-03 | [
[
"Pompili",
"Lorenzo",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Estellés",
"Héctor",
""
],
[
"Khalil",
"Mohammed",
""
],
[
"van de Meent",
"Maarten",
""
],
[
"Mihaylov",
"Deyan P.",
""
],
[
"Ossokine",
"Sergue... | We present SEOBNRv5HM, a more accurate and faster inspiral-merger-ringdown gravitational waveform model for quasi-circular, spinning, nonprecessing binary black holes within the effective-one-body (EOB) formalism. Compared to its predecessor, SEOBNRv4HM, the waveform model i) incorporates recent high-order post- Newton... |
1301.1895 | Eliu Huerta | E. A. Huerta and Duncan A. Brown | Effect of eccentricity on binary neutron star searches in Advanced LIGO | 5 pages, 2 figures. Submitted to Phys. Rev. D. v2: Typos corrected,
various edits in light of referee's comments. Accepted to Phys. Rev. D | Phys. Rev. D.87:127501, 2013 | 10.1103/PhysRevD.87.127501 | LIGO DCC 1200187; KITP number NSF-KITP-12-194 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary neutron stars (BNSs) are the primary source of gravitational waves for
the Laser Interferometer Gravitational-Wave Observatory (LIGO) and its
international partners Virgo and KAGRA. Current BNS searches target field
binaries whose orbits will have circularized by radiation reaction before their
gravitational w... | [
{
"created": "Wed, 9 Jan 2013 17:39:50 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2013 21:33:29 GMT",
"version": "v2"
}
] | 2013-06-11 | [
[
"Huerta",
"E. A.",
""
],
[
"Brown",
"Duncan A.",
""
]
] | Binary neutron stars (BNSs) are the primary source of gravitational waves for the Laser Interferometer Gravitational-Wave Observatory (LIGO) and its international partners Virgo and KAGRA. Current BNS searches target field binaries whose orbits will have circularized by radiation reaction before their gravitational wav... |
1810.03902 | Pradip Mukherjee | Rabin Banerjee and Pradip Mukherjee | Galilean gauge theory from Poincare gauge theory | 20 pages, Latex; title changed, the review part is shortened and text
revised accompanying a change of emphasis. Published version | Phys. Rev. D 98, 124021 (2018) | 10.1103/PhysRevD.98.124021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide an exact mapping between the Galilian gauge theory, recently
advocated by us \cite{BMM1, BMM2, BM}, and the Poincare gauge theory. Applying
this correspondence we provide a vielbein approach to the geometric formulation
of Newton's gravity where no ansatze or additional conditions are required.
| [
{
"created": "Tue, 9 Oct 2018 10:46:37 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jan 2019 14:35:08 GMT",
"version": "v2"
}
] | 2019-01-03 | [
[
"Banerjee",
"Rabin",
""
],
[
"Mukherjee",
"Pradip",
""
]
] | We provide an exact mapping between the Galilian gauge theory, recently advocated by us \cite{BMM1, BMM2, BM}, and the Poincare gauge theory. Applying this correspondence we provide a vielbein approach to the geometric formulation of Newton's gravity where no ansatze or additional conditions are required. |
gr-qc/0001088 | Chiang-Mei Chen | Chiang-Mei Chen and James M. Nester | A Symplectic Hamiltonian Derivation of Quasilocal Energy-Momentum for GR | 24 pages, REVTEX, no figures | Grav.Cosmol. 6 (2000) 257-270 | null | null | gr-qc | null | The various roles of boundary terms in the gravitational Lagrangian and
Hamiltonian are explored. A symplectic Hamiltonian-boundary-term approach is
ideally suited for a large class of quasilocal energy-momentum expressions for
general relativity. This approach provides a physical interpretation for many
of the well-... | [
{
"created": "Thu, 27 Jan 2000 05:16:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chen",
"Chiang-Mei",
""
],
[
"Nester",
"James M.",
""
]
] | The various roles of boundary terms in the gravitational Lagrangian and Hamiltonian are explored. A symplectic Hamiltonian-boundary-term approach is ideally suited for a large class of quasilocal energy-momentum expressions for general relativity. This approach provides a physical interpretation for many of the well-kn... |
0705.4066 | Andrzej Krasi\'nski | Andrzej Krasi\'nski and Krzysztof Bolejko | Can a charged dust ball be sent through the Reissner--Nordstr\"{o}m
wormhole? | 30 pages, 21 figures; several corrections after referee's comments, 4
figures modified | Phys.Rev.D76:124013,2007 | 10.1103/PhysRevD.76.124013 | null | gr-qc | null | In a previous paper we formulated a set of necessary conditions for the
spherically symmetric weakly charged dust to avoid Big Bang/Big Crunch, shell
crossing and permanent central singularities. However, we did not discuss the
properties of the energy density, some of which are surprising and seem not to
have been k... | [
{
"created": "Mon, 28 May 2007 16:55:39 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2007 11:37:36 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Oct 2007 12:58:43 GMT",
"version": "v3"
}
] | 2009-09-29 | [
[
"Krasiński",
"Andrzej",
""
],
[
"Bolejko",
"Krzysztof",
""
]
] | In a previous paper we formulated a set of necessary conditions for the spherically symmetric weakly charged dust to avoid Big Bang/Big Crunch, shell crossing and permanent central singularities. However, we did not discuss the properties of the energy density, some of which are surprising and seem not to have been kno... |
1206.2509 | Edward Porter | J\'er\^ome Carr\'e and Edward K. Porter | Modeling a circular equatorial test-particle in a Kerr spacetime | 18 pages, 11 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extreme Mass Ratio Inspirals (EMRIs) are one of the main gravitational wave
(GW) sources for a future space detector, such as eLISA/NGO, and third
generation ground-based detectors, like the Einstein Telescope. These systems
present an interest both in astrophysics and fundamental physics. In order to
make a high pre... | [
{
"created": "Tue, 12 Jun 2012 12:38:40 GMT",
"version": "v1"
}
] | 2012-06-13 | [
[
"Carré",
"Jérôme",
""
],
[
"Porter",
"Edward K.",
""
]
] | Extreme Mass Ratio Inspirals (EMRIs) are one of the main gravitational wave (GW) sources for a future space detector, such as eLISA/NGO, and third generation ground-based detectors, like the Einstein Telescope. These systems present an interest both in astrophysics and fundamental physics. In order to make a high preci... |
2207.08749 | Kristina Giesel | Kristina Giesel and Michael Kobler | An open scattering model in polymerized quantum mechanics | 37 pages, 2 figures, corrected some typos and updated references | Mathematics 2022, 10(22), 4248 | 10.3390/math10224248 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a quantum master equation in the context of a polymerized open
quantum mechanical system for the scattering of a Brownian particle in an ideal
gas environment. The model is formulated in a top-down approach by choosing a
Hamiltonian with a coupling between the system and environment that is
generally associ... | [
{
"created": "Mon, 18 Jul 2022 16:52:18 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2023 21:20:34 GMT",
"version": "v2"
}
] | 2023-02-17 | [
[
"Giesel",
"Kristina",
""
],
[
"Kobler",
"Michael",
""
]
] | We derive a quantum master equation in the context of a polymerized open quantum mechanical system for the scattering of a Brownian particle in an ideal gas environment. The model is formulated in a top-down approach by choosing a Hamiltonian with a coupling between the system and environment that is generally associat... |
gr-qc/9807052 | Francesco Fucito | E. Coccia and F. Fucito | Detection of Scalar Particles in Gravitational Waves from Resonant-Mass
Detectors of Spherical Shape | 4 pages, contribution to PASCOS 98 | null | null | null | gr-qc astro-ph hep-th | null | We report on some recent work, which points out the relevance of future
measurements of gravitational waves by resonant-mass detectors of spherical
shape for theories of gravity of non-Einstein type.
| [
{
"created": "Mon, 20 Jul 1998 13:06:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Coccia",
"E.",
""
],
[
"Fucito",
"F.",
""
]
] | We report on some recent work, which points out the relevance of future measurements of gravitational waves by resonant-mass detectors of spherical shape for theories of gravity of non-Einstein type. |
2004.04521 | Naveena Kumara A | A. Naveena Kumara, C.L. Ahmed Rizwan, Kartheek Hegde, Md Sabir Ali,
Ajith K.M | Rotating 4D Gauss-Bonnet black hole as particle accelerator | 17 pages, 4 figures | Annals of Physics 434 (2021) 168599 | 10.1016/j.aop.2021.168599 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the four-dimensional Gauss-Bonnet black hole can act as a
particle accelerator with arbitrarily high centre-of-mass energy, during the
collision of two general particles near the event horizon. The Gauss-Bonnet
coupling constant $\alpha$, provides a deviation in the results from that of
Kerr black... | [
{
"created": "Thu, 9 Apr 2020 12:56:52 GMT",
"version": "v1"
}
] | 2021-09-28 | [
[
"Kumara",
"A. Naveena",
""
],
[
"Rizwan",
"C. L. Ahmed",
""
],
[
"Hegde",
"Kartheek",
""
],
[
"Ali",
"Md Sabir",
""
],
[
"M",
"Ajith K.",
""
]
] | We demonstrate that the four-dimensional Gauss-Bonnet black hole can act as a particle accelerator with arbitrarily high centre-of-mass energy, during the collision of two general particles near the event horizon. The Gauss-Bonnet coupling constant $\alpha$, provides a deviation in the results from that of Kerr black h... |
2303.18172 | Kristina Giesel | Thomas Thiemann and Kristina Giesel | Hamiltonian Theory: Dynamics | 52 pages. This is a preprint of a chapter to appear in the "Handbook
of Quantum Gravity", edited by Cosimo Bambi, Leonardo Modesto and Ilya
Shapiro, 2023, Springer, reproduced with permission of Springer | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This chapter focuses on the status of the implementation of the dynamics in
the canonical version of Loop Quantum Gravity (LQG). Concretely this means to
provide a mathematical meaning of the quantum Einstein equations, sometimes
called Wheeler-DeWitt equations, to give a physical interpretation and Hilbert
space str... | [
{
"created": "Fri, 31 Mar 2023 16:11:31 GMT",
"version": "v1"
}
] | 2023-04-03 | [
[
"Thiemann",
"Thomas",
""
],
[
"Giesel",
"Kristina",
""
]
] | This chapter focuses on the status of the implementation of the dynamics in the canonical version of Loop Quantum Gravity (LQG). Concretely this means to provide a mathematical meaning of the quantum Einstein equations, sometimes called Wheeler-DeWitt equations, to give a physical interpretation and Hilbert space struc... |
1612.04205 | Kirill Bronnikov | K.A. Bronnikov, P.A. Korolyov, A. Makhmudov, M.V. Skvortsova | Wormholes and black universes communicated with extra dimensions | 6 pages, 2 figures, 1 table. Submitted to Proceedings of the
International conference on particle physics and astrophysics (10-14.10.2016,
Moscow, Russia) | J. Phys. Conf. Series 798, 012090 (2017) | 10.1088/1742-6596/798/1/012090 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 6D general relativity with a phantom scalar field as a source of gravity,
we present solutions that implement a transition from an effective 4D geometry
times small extra dimensions to an effectively 6D space-time where the physical
laws are different from ours. We consider manifolds with the structure M0 x M1
x M... | [
{
"created": "Tue, 13 Dec 2016 14:36:07 GMT",
"version": "v1"
}
] | 2017-09-19 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Korolyov",
"P. A.",
""
],
[
"Makhmudov",
"A.",
""
],
[
"Skvortsova",
"M. V.",
""
]
] | In 6D general relativity with a phantom scalar field as a source of gravity, we present solutions that implement a transition from an effective 4D geometry times small extra dimensions to an effectively 6D space-time where the physical laws are different from ours. We consider manifolds with the structure M0 x M1 x M2,... |
2110.01874 | Qian Hu | Qian Hu, Cong Zhou, Jhao-Hong Peng, Linqing Wen, Qi Chu, and Manoj
Kovalam | Semianalytical Approach for Sky Localization of Gravitational Waves | 15 pages, 8 figures | Phys. Rev. D 104, 104008 (2021) | 10.1103/PhysRevD.104.104008 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rapid sky localization of gravitational wave sources is crucial to enable
prompt electromagnetic follow-ups. In this article, we present a novel
semianalytical approach for sky localization of gravitational waves from
compact binary coalescences. We use the Bayesian framework with an analytical
approximation to the p... | [
{
"created": "Tue, 5 Oct 2021 08:26:07 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Nov 2021 14:43:33 GMT",
"version": "v2"
}
] | 2021-11-04 | [
[
"Hu",
"Qian",
""
],
[
"Zhou",
"Cong",
""
],
[
"Peng",
"Jhao-Hong",
""
],
[
"Wen",
"Linqing",
""
],
[
"Chu",
"Qi",
""
],
[
"Kovalam",
"Manoj",
""
]
] | Rapid sky localization of gravitational wave sources is crucial to enable prompt electromagnetic follow-ups. In this article, we present a novel semianalytical approach for sky localization of gravitational waves from compact binary coalescences. We use the Bayesian framework with an analytical approximation to the pri... |
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