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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1208.1437 | James Lucietti | James Lucietti and Harvey S. Reall | Gravitational instability of an extreme Kerr black hole | 13 pages. v2: minor clarifications. v3: minor changes, published
version | Phys.Rev.D86:104030,2012 | 10.1103/PhysRevD.86.104030 | EMPG-12-15 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Aretakis has proved the existence of an instability of a massless scalar
field at the horizon of an extreme Kerr or Reissner-Nordstrom black hole: for
generic initial data, a transverse derivative of the scalar field at the
horizon does not decay, and higher transverse derivatives blow up. We show that
a similar inst... | [
{
"created": "Tue, 7 Aug 2012 14:51:13 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2012 10:47:38 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Nov 2012 13:57:16 GMT",
"version": "v3"
}
] | 2012-11-16 | [
[
"Lucietti",
"James",
""
],
[
"Reall",
"Harvey S.",
""
]
] | Aretakis has proved the existence of an instability of a massless scalar field at the horizon of an extreme Kerr or Reissner-Nordstrom black hole: for generic initial data, a transverse derivative of the scalar field at the horizon does not decay, and higher transverse derivatives blow up. We show that a similar instab... |
2307.15382 | Jiachen An | Jiachen An, Yadong Xue, Zhoujian Cao, Xiaokai He, Bing Sun | The effect of the gravitational constant variation on the propagation of
gravitational waves | null | null | 10.1016/j.physletb.2023.138108 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Since the first detection of gravitational waves, they have been used to
investigate various fundamental problems, including the variation of physical
constants. Regarding the gravitational constant, previous works focused on the
effect of the gravitational constant variation on the gravitational wave
generation. In ... | [
{
"created": "Fri, 28 Jul 2023 08:07:47 GMT",
"version": "v1"
}
] | 2023-08-10 | [
[
"An",
"Jiachen",
""
],
[
"Xue",
"Yadong",
""
],
[
"Cao",
"Zhoujian",
""
],
[
"He",
"Xiaokai",
""
],
[
"Sun",
"Bing",
""
]
] | Since the first detection of gravitational waves, they have been used to investigate various fundamental problems, including the variation of physical constants. Regarding the gravitational constant, previous works focused on the effect of the gravitational constant variation on the gravitational wave generation. In th... |
2009.02735 | Jefferson Toledo | J. M. Toledo and V. B. Bezerra | Black holes with a fluid of strings | null | null | 10.1016/j.aop.2020.168349 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain an exact solution of Einstein's equations for a charged, static and
spherically symmetric body, surrounded by a fluid of strings and with a
cosmological constant. This corresponds to the Reissner-Nordstr\"om (de
Sitter)-Anti de Sitter black hole surrounded by a fluid of strings. Some
aspects concerning the ... | [
{
"created": "Sun, 6 Sep 2020 13:45:07 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Toledo",
"J. M.",
""
],
[
"Bezerra",
"V. B.",
""
]
] | We obtain an exact solution of Einstein's equations for a charged, static and spherically symmetric body, surrounded by a fluid of strings and with a cosmological constant. This corresponds to the Reissner-Nordstr\"om (de Sitter)-Anti de Sitter black hole surrounded by a fluid of strings. Some aspects concerning the ho... |
1607.04359 | Hernando Quevedo | Antonio C. Guti\'errez-Pi\~neres and Hernando Quevedo | Newman-Janis Ansatz in conformastatic spacetimes | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Newman-Janis Ansatz was used first to obtain the stationary Kerr metric
from the static Schwarzschild metric. Many works have been devoted to
investigate the physical significance of this Ansatz, but no definite answer
has been given so far. We show that this Ansatz can be applied in general to
conformastatic vac... | [
{
"created": "Fri, 15 Jul 2016 01:45:18 GMT",
"version": "v1"
}
] | 2016-08-05 | [
[
"Gutiérrez-Piñeres",
"Antonio C.",
""
],
[
"Quevedo",
"Hernando",
""
]
] | The Newman-Janis Ansatz was used first to obtain the stationary Kerr metric from the static Schwarzschild metric. Many works have been devoted to investigate the physical significance of this Ansatz, but no definite answer has been given so far. We show that this Ansatz can be applied in general to conformastatic vacuu... |
gr-qc/9804065 | Peter H\"ubner | Peter Huebner | How to Avoid Artificial Boundaries in the Numerical Calculation of Black
Hole Spacetimes | 21 pages, 10 figures, revtex, epsfig, improved presentation | null | 10.1088/0264-9381/16/7/301 | AEI-62 | gr-qc | null | This is the first of a series of papers describing a numerical implementation
of the conformally rescaled Einstein equation, an implementation designed to
calculate asymptotically flat spacetimes, especially spacetimes containing
black holes.
In the present paper we derive the new first order time evolution equatio... | [
{
"created": "Fri, 24 Apr 1998 12:31:43 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Mar 1999 12:35:43 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Huebner",
"Peter",
""
]
] | This is the first of a series of papers describing a numerical implementation of the conformally rescaled Einstein equation, an implementation designed to calculate asymptotically flat spacetimes, especially spacetimes containing black holes. In the present paper we derive the new first order time evolution equations t... |
1307.5238 | Thomas Cailleteau Mr | Thomas Cailleteau, Linda Linsefors and Aurelien Barrau | Anomaly-free perturbations with inverse-volume and holonomy corrections
in Loop Quantum Cosmology | previous mistake corrected leading to new results | Class.Quant.Grav. 31 (2014) 125011 | 10.1088/0264-9381/31/12/125011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article addresses the issue of the closure of the algebra of constraints
for generic (cosmological) perturbations when taking into account
simultaneously the two main corrections of effective loop quantum cosmology,
namely the holonomy and the inverse-volume terms. Previous works on either the
holonomy or the in... | [
{
"created": "Fri, 19 Jul 2013 14:43:10 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2014 17:42:03 GMT",
"version": "v2"
}
] | 2014-07-28 | [
[
"Cailleteau",
"Thomas",
""
],
[
"Linsefors",
"Linda",
""
],
[
"Barrau",
"Aurelien",
""
]
] | This article addresses the issue of the closure of the algebra of constraints for generic (cosmological) perturbations when taking into account simultaneously the two main corrections of effective loop quantum cosmology, namely the holonomy and the inverse-volume terms. Previous works on either the holonomy or the inve... |
gr-qc/9312016 | Steve Detweiler | Steven Detweiler | Periodic Solutions of the Einstein Equations for Binary Systems | 18 pages, RevTeX 3.0, UF-RAP-93-12 | Phys.Rev.D50:4929-4943,1994 | 10.1103/PhysRevD.50.4929 | null | gr-qc | null | This revision includes clarified exposition and simplified analysis.
Solutions of the Einstein equations which are periodic and have standing
gravitational waves are valuable approximations to more physically realistic
solutions with outgoing waves. A variational principle is found which has the
power to provide an a... | [
{
"created": "Thu, 9 Dec 1993 15:41:31 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jul 1994 15:20:08 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Detweiler",
"Steven",
""
]
] | This revision includes clarified exposition and simplified analysis. Solutions of the Einstein equations which are periodic and have standing gravitational waves are valuable approximations to more physically realistic solutions with outgoing waves. A variational principle is found which has the power to provide an acc... |
0808.0861 | Maria Babiuc | M. C. Babiuc, N. T. Bishop, B. Szilagyi, J. Winicour | Strategies for the Characteristic Extraction of Gravitational Waveforms | 26 pages, 14 figures, Published in Phys.Rev.D79:084011,2009 | Phys.Rev.D79:084011,2009 | 10.1103/PhysRevD.79.084011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop, test and compare new numerical and geometrical methods for
improving the accuracy of extracting waveforms using characteristic evolution.
The new numerical method involves use of circular boundaries to the
stereographic grid patches which cover the spherical cross-sections of the
outgoing null cones. We s... | [
{
"created": "Wed, 6 Aug 2008 15:49:50 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2009 13:32:33 GMT",
"version": "v2"
}
] | 2009-09-14 | [
[
"Babiuc",
"M. C.",
""
],
[
"Bishop",
"N. T.",
""
],
[
"Szilagyi",
"B.",
""
],
[
"Winicour",
"J.",
""
]
] | We develop, test and compare new numerical and geometrical methods for improving the accuracy of extracting waveforms using characteristic evolution. The new numerical method involves use of circular boundaries to the stereographic grid patches which cover the spherical cross-sections of the outgoing null cones. We sho... |
1403.4190 | Yi-Qiang Du | Yi-Qiang Du and Yu Tian | The Universal Property of the Entropy Sum of Black Holes in All
Dimensions | 16 pages,no figures;v2: 17 pages, references added, minor
corrections/modifications; v3: 16 pages, added references, correct some
expressons, added equation (16) to make the context more clear, to appear in
PLB | Phys. Lett. B 739 (2014) 250-255 | 10.1016/j.physletb.2014.10.052 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is proposed by Cvetic et al [Phys. Rev. Lett. 106 (2011) 121301] that the
product of all horizon areas for general rotating multi-change black holes has
universal expressions independent of the mass. When we consider the product of
all horizon entropies, however, the mass will be present in some cases, while
anoth... | [
{
"created": "Mon, 17 Mar 2014 17:58:01 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2014 14:41:54 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Oct 2014 15:01:06 GMT",
"version": "v3"
},
{
"created": "Mon, 10 Nov 2014 15:17:01 GMT",
"version": "v4"
}
] | 2014-11-12 | [
[
"Du",
"Yi-Qiang",
""
],
[
"Tian",
"Yu",
""
]
] | It is proposed by Cvetic et al [Phys. Rev. Lett. 106 (2011) 121301] that the product of all horizon areas for general rotating multi-change black holes has universal expressions independent of the mass. When we consider the product of all horizon entropies, however, the mass will be present in some cases, while another... |
gr-qc/0412019 | Miguel Alcubierre | Miguel Alcubierre | The status of numerical relativity | Report on plenary talk at the 17th International Conference on
General Relativity and Gravitation (GR17), held at Dublin, Ireland, july
2004. Latex, 20 pages, 5 figures | null | 10.1142/9789812701688_0001 | null | gr-qc | null | Numerical relativity has come a long way in the last three decades and is now
reaching a state of maturity. We are gaining a deeper understanding of the
fundamental theoretical issues related to the field, from the well posedness of
the Cauchy problem, to better gauge conditions, improved boundary treatment,
and more... | [
{
"created": "Fri, 3 Dec 2004 17:06:53 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Alcubierre",
"Miguel",
""
]
] | Numerical relativity has come a long way in the last three decades and is now reaching a state of maturity. We are gaining a deeper understanding of the fundamental theoretical issues related to the field, from the well posedness of the Cauchy problem, to better gauge conditions, improved boundary treatment, and more r... |
1111.3344 | Frank L\"offler | Frank L\"offler, Joshua Faber, Eloisa Bentivegna, Tanja Bode, Peter
Diener, Roland Haas, Ian Hinder, Bruno C. Mundim, Christian D. Ott, Erik
Schnetter, Gabrielle Allen, Manuela Campanelli, Pablo Laguna | The Einstein Toolkit: A Community Computational Infrastructure for
Relativistic Astrophysics | 62 pages, 20 figures | null | 10.1088/0264-9381/29/11/115001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the Einstein Toolkit, a community-driven, freely accessible
computational infrastructure intended for use in numerical relativity,
relativistic astrophysics, and other applications. The Toolkit, developed by a
collaboration involving researchers from multiple institutions around the
world, combines a core... | [
{
"created": "Mon, 14 Nov 2011 20:15:14 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Löffler",
"Frank",
""
],
[
"Faber",
"Joshua",
""
],
[
"Bentivegna",
"Eloisa",
""
],
[
"Bode",
"Tanja",
""
],
[
"Diener",
"Peter",
""
],
[
"Haas",
"Roland",
""
],
[
"Hinder",
"Ian",
""
],
[
"Mundim"... | We describe the Einstein Toolkit, a community-driven, freely accessible computational infrastructure intended for use in numerical relativity, relativistic astrophysics, and other applications. The Toolkit, developed by a collaboration involving researchers from multiple institutions around the world, combines a core s... |
2112.14496 | Sugumi Kanno | Sugumi Kanno, Jiro Soda | Squeezed quantum states of graviton and axion in the universe | 28 pages, 7 figures | null | 10.1142/S0218271822500985 | KOBE-COSMO-21-19 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Particle production during cosmic expansion can be interpreted as a two-mode
squeezing process of quantum states. The two-mode squeezed states consist of an
infinite number of entangled particles and then enhance the nonclassicality of
particles. There are two methods for estimating the degree of squeezing. One is
to... | [
{
"created": "Wed, 29 Dec 2021 11:00:02 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Kanno",
"Sugumi",
""
],
[
"Soda",
"Jiro",
""
]
] | Particle production during cosmic expansion can be interpreted as a two-mode squeezing process of quantum states. The two-mode squeezed states consist of an infinite number of entangled particles and then enhance the nonclassicality of particles. There are two methods for estimating the degree of squeezing. One is to e... |
1904.03187 | LSC P&P Committee | The LIGO Scientific collaboration | Gravitational wave astronomy with LIGO and similar detectors in the next
decade | 9 pages, 3 figures, White Paper Submitted to Astro2020 (2020
Astronomy and Astrophysics Decadal Survey) by the LIGO Scientific
Collaboration | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We describe the plans for gravitational-wave observations and astrophysics
that will be carried out by the LIGO Scientific Collaboration (LSC) in the next
decade using data from the LIGO Observatories in the US, and sister facilities
abroad in Europe, Japan and India. We provide an overview of gravitational wave
sign... | [
{
"created": "Fri, 5 Apr 2019 15:43:50 GMT",
"version": "v1"
}
] | 2019-04-09 | [
[
"The LIGO Scientific collaboration",
"",
""
]
] | We describe the plans for gravitational-wave observations and astrophysics that will be carried out by the LIGO Scientific Collaboration (LSC) in the next decade using data from the LIGO Observatories in the US, and sister facilities abroad in Europe, Japan and India. We provide an overview of gravitational wave signal... |
1609.00751 | James Dilts | James Dilts and James Isenberg | Existence and Blowup Results for Asymptotically Euclidean Initial Data
Sets Generated by the Conformal Method | 27 pages | Phys. Rev. D 94, 104046 (2016) | 10.1103/PhysRevD.94.104046 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For each set of (freely chosen) seed data, the conformal method reduces the
Einstein constraint equations to a system of elliptic equations, the conformal
constraint equations. We prove an admissibility criterion, based on a
(conformal) prescribed scalar curvature problem, which provides a necessary
condition on the ... | [
{
"created": "Fri, 2 Sep 2016 21:25:36 GMT",
"version": "v1"
}
] | 2016-11-30 | [
[
"Dilts",
"James",
""
],
[
"Isenberg",
"James",
""
]
] | For each set of (freely chosen) seed data, the conformal method reduces the Einstein constraint equations to a system of elliptic equations, the conformal constraint equations. We prove an admissibility criterion, based on a (conformal) prescribed scalar curvature problem, which provides a necessary condition on the se... |
1304.7765 | Ranjan Sharma | Ranjan Sharma and Shyam Das | Collapse of a relativistic self-gravitating star with radial heat flux:
Impact of anisotropic stresses | To appear in Journal of Gravity | Journal of Gravity, Vol. 2013, Article ID 659605, 2013 | 10.1155/2013/659605 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a simple model for a self-gravitating spherically symmetric
relativistic star which begins to collapse from an initially static
configuration by dissipating energy in the form of radial heat flow. We utilize
the model to show how local anisotropy effects the collapse rate and thermal
behaviour of gravitati... | [
{
"created": "Sun, 28 Apr 2013 16:07:53 GMT",
"version": "v1"
}
] | 2013-12-10 | [
[
"Sharma",
"Ranjan",
""
],
[
"Das",
"Shyam",
""
]
] | We develop a simple model for a self-gravitating spherically symmetric relativistic star which begins to collapse from an initially static configuration by dissipating energy in the form of radial heat flow. We utilize the model to show how local anisotropy effects the collapse rate and thermal behaviour of gravitation... |
1702.04244 | Hossein Mohseni Sadjadi | H. Mohseni Sadjadi and V. Anari | Mass varying neutrinos, symmetry breaking, and cosmic acceleration | 24 pages, 7 figures, typos fixed, accepted by Physical Review D | Phys. Rev. D 95, 123521 (2017) | 10.1103/PhysRevD.95.123521 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new proposal for the onset of cosmic acceleration based on
mass-varying neutrinos. When massive neutrinos become nonrelativistic, the
$Z_2$ symmetry breaks, and the quintessence potential becomes positive from its
initially zero value. This positive potential behaves like a cosmological
constant at the... | [
{
"created": "Mon, 13 Feb 2017 12:36:02 GMT",
"version": "v1"
},
{
"created": "Tue, 23 May 2017 03:54:50 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Jun 2017 11:03:08 GMT",
"version": "v3"
}
] | 2017-06-21 | [
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Anari",
"V.",
""
]
] | We introduce a new proposal for the onset of cosmic acceleration based on mass-varying neutrinos. When massive neutrinos become nonrelativistic, the $Z_2$ symmetry breaks, and the quintessence potential becomes positive from its initially zero value. This positive potential behaves like a cosmological constant at the p... |
2104.11049 | Etevaldo dos Santos Costa Filho | Etevaldo dos Santos Costa Filho, Angelo guimar\~aes and I.
Cabrera-Munguia | The relations between the multipole moments in axistationary
electrovacuum spacetimes and the $N$-soliton solution | 27 pages | null | 10.1007/s10714-022-02903-w | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A general formulation of the relativistic multipole moments in axistationary
electrovac spacetimes is introduced in a closed analytical form. We give a
complete description of how the Ernst potentials on the symmetry axis can be
completely characterized by these arbitrary multipole moments. Some concrete
applications... | [
{
"created": "Thu, 22 Apr 2021 13:27:38 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 2021 18:11:20 GMT",
"version": "v2"
}
] | 2024-05-09 | [
[
"Filho",
"Etevaldo dos Santos Costa",
""
],
[
"guimarães",
"Angelo",
""
],
[
"Cabrera-Munguia",
"I.",
""
]
] | A general formulation of the relativistic multipole moments in axistationary electrovac spacetimes is introduced in a closed analytical form. We give a complete description of how the Ernst potentials on the symmetry axis can be completely characterized by these arbitrary multipole moments. Some concrete applications a... |
2404.02802 | Simone Lo Franco | S. Lo Franco, G. Montani | Quantum Big-Bounce as a phenomenology of RQM in the Mini-superspace | 7 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the emergence of a quantum Big-Bounce in the context of an
isotropic Universe, filled by a self-interacting scalar field, which plays the
role of a physical clock. The bouncing cosmology is the result of a scattering
process, driven by the scalar field potential, which presence breaks down the
frequenc... | [
{
"created": "Wed, 3 Apr 2024 15:18:00 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2024 12:11:09 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Apr 2024 10:27:33 GMT",
"version": "v3"
}
] | 2024-04-09 | [
[
"Franco",
"S. Lo",
""
],
[
"Montani",
"G.",
""
]
] | We investigate the emergence of a quantum Big-Bounce in the context of an isotropic Universe, filled by a self-interacting scalar field, which plays the role of a physical clock. The bouncing cosmology is the result of a scattering process, driven by the scalar field potential, which presence breaks down the frequency ... |
gr-qc/9406049 | Robert Mann | J.S.F. Chan, K.C.K. Chan and R.B. Mann | Interior Structure of a Charged Spinning Black Hole in
$(2+1)$-Dimensions | 5 pages, 2 figures (appended as postscript files), WATPHYS-TH94/06 | Phys.Rev. D54 (1996) 1535-1539 | 10.1103/PhysRevD.54.1535 | null | gr-qc hep-th | null | The phenomenon of mass inflation is shown to occur for a rotating black hole.
We demonstrate this feature in $(2+1)$ dimensions by extending the charged
spinning BTZ black hole to Vaidya form. We find that the mass function diverges
in a manner quantitatively similar to its static counterparts in $(3+1)$,
$(2+1)$ and... | [
{
"created": "Tue, 28 Jun 1994 15:52:23 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Chan",
"J. S. F.",
""
],
[
"Chan",
"K. C. K.",
""
],
[
"Mann",
"R. B.",
""
]
] | The phenomenon of mass inflation is shown to occur for a rotating black hole. We demonstrate this feature in $(2+1)$ dimensions by extending the charged spinning BTZ black hole to Vaidya form. We find that the mass function diverges in a manner quantitatively similar to its static counterparts in $(3+1)$, $(2+1)$ and $... |
1105.0094 | Hugo Garcia-Compean | Felipe Robledo-Padilla, Hugo Garcia-Compean | Entangled spinning particles in charged and rotating black holes | 25+1 pages, 7 eps figures. Major changes were made through all the
manuscript. Clarifications regarding modifications were introduced through
the draft. Figures were changed and reduced in number. arXiv admin note: text
overlap with arXiv:quant-ph/0307114 | Physics Essays 26, 1 (2013) | 10.4006/0836-1398-26.1.86 | Cinvestav-Fis-11/057 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin precession for an EPR pair of spin-1/2 particles in equatorial orbits
around a Kerr-Newman black hole is studied. Hovering observers are introduced
to ensure fixed reference frames in order to perform the Wigner rotation. These
observers also guarantee a reliable direction to compare spin states in
rotating blac... | [
{
"created": "Sat, 30 Apr 2011 16:15:24 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2011 05:30:04 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Apr 2012 22:38:20 GMT",
"version": "v3"
}
] | 2013-05-09 | [
[
"Robledo-Padilla",
"Felipe",
""
],
[
"Garcia-Compean",
"Hugo",
""
]
] | Spin precession for an EPR pair of spin-1/2 particles in equatorial orbits around a Kerr-Newman black hole is studied. Hovering observers are introduced to ensure fixed reference frames in order to perform the Wigner rotation. These observers also guarantee a reliable direction to compare spin states in rotating black ... |
1811.03672 | Assaf Lanir | Assaf Lanir, Amos Ori, Noa Zilberman, Orr Sela, Ahron Maline, Adam
Levi | Analysis of quantum effects inside spherical charged black holes | 7 pages, 4 figures | Phys. Rev. D 99, 061502 (2019) | 10.1103/PhysRevD.99.061502 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We numerically compute the renormalized expectation value
$\langle\hat{\Phi}^{2}\rangle_{ren}$ of a minimally-coupled massless quantum
scalar field in the interior of a four-dimensional Reissner-Nordstrom black
hole, in both the Hartle-Hawking and Unruh states. To this end we use a
recently developed mode-sum renorma... | [
{
"created": "Thu, 8 Nov 2018 20:26:56 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2021 08:35:29 GMT",
"version": "v2"
}
] | 2021-05-04 | [
[
"Lanir",
"Assaf",
""
],
[
"Ori",
"Amos",
""
],
[
"Zilberman",
"Noa",
""
],
[
"Sela",
"Orr",
""
],
[
"Maline",
"Ahron",
""
],
[
"Levi",
"Adam",
""
]
] | We numerically compute the renormalized expectation value $\langle\hat{\Phi}^{2}\rangle_{ren}$ of a minimally-coupled massless quantum scalar field in the interior of a four-dimensional Reissner-Nordstrom black hole, in both the Hartle-Hawking and Unruh states. To this end we use a recently developed mode-sum renormali... |
gr-qc/0010054 | Berndt Muller | Sergei G. Matinyan | Chaos in Non-Abelian Gauge Fields, Gravity, and Cosmology | Lecture presented at the Ninth Marcel Grossmann Conference in Rome,
Italy, July 2000 | null | null | null | gr-qc hep-th | null | This talk describes the evolution of studies of chaos in Yang-Mills fields,
gravity, and cosmology. The main subject is a BKL regime near the singularity
$t=0$ and its survival in higher dimensions and in string theory. We also
describe the recent progress in the search for particle-like solutions of the
Einstein-Yan... | [
{
"created": "Fri, 13 Oct 2000 16:56:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Matinyan",
"Sergei G.",
""
]
] | This talk describes the evolution of studies of chaos in Yang-Mills fields, gravity, and cosmology. The main subject is a BKL regime near the singularity $t=0$ and its survival in higher dimensions and in string theory. We also describe the recent progress in the search for particle-like solutions of the Einstein-Yang-... |
gr-qc/0309124 | Joan Josep Ferrando | Joan J. Ferrando, Juan A. S\'aez | Vacuum type I spacetimes and aligned Papapetrou fields: symmetries | 19 pages; a reference added | Class.Quant.Grav. 20 (2003) 5291-5307 | 10.1088/0264-9381/20/24/004 | null | gr-qc | null | We analyze type I vacuum solutions admitting an isometry whose Killing
2--form is aligned with a principal bivector of the Weyl tensor, and we show
that these solutions belong to a family of type I metrics which admit a group
$G_3$ of isometries. We give a classification of this family and we study the
Bianchi type f... | [
{
"created": "Thu, 25 Sep 2003 13:55:05 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Oct 2003 17:08:53 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ferrando",
"Joan J.",
""
],
[
"Sáez",
"Juan A.",
""
]
] | We analyze type I vacuum solutions admitting an isometry whose Killing 2--form is aligned with a principal bivector of the Weyl tensor, and we show that these solutions belong to a family of type I metrics which admit a group $G_3$ of isometries. We give a classification of this family and we study the Bianchi type for... |
1406.7154 | Priscilla Canizares | Priscilla Canizares (1) and Carlos F. Sopuerta (2) ((1) IoA, Cambridge
University, (2) Institute of Space Sciences (CSIC-IEEC)) | Overcoming the Gauge Problem for the Gravitational Self-Force | 5 pages, 1 figure | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational waves emitted by binary systems with extreme-mass ratios
carry unique astrophysical information that can only be detected by space-based
detectors like eLISA. To that end, a very accurate modelling of the system is
required. The gravitational self-force program, which has been fully developed
in the... | [
{
"created": "Fri, 27 Jun 2014 11:38:25 GMT",
"version": "v1"
}
] | 2014-06-30 | [
[
"Canizares",
"Priscilla",
""
],
[
"Sopuerta",
"Carlos F.",
""
]
] | The gravitational waves emitted by binary systems with extreme-mass ratios carry unique astrophysical information that can only be detected by space-based detectors like eLISA. To that end, a very accurate modelling of the system is required. The gravitational self-force program, which has been fully developed in the L... |
gr-qc/0011018 | B. Linet | B. Linet | Light propagation around a relativistic vortex flow of dielectric medium | 9 pages, 2 figures in latex | null | null | null | gr-qc | null | We determine the path of the light around a dielectric vortex described by
the relativistic vortex flow of a perfect fluid.
| [
{
"created": "Mon, 6 Nov 2000 17:01:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Linet",
"B.",
""
]
] | We determine the path of the light around a dielectric vortex described by the relativistic vortex flow of a perfect fluid. |
gr-qc/0203070 | B. V. Ivanov | B.V.Ivanov | Static charged perfect fluid spheres in general relativity | 23 pages, Revtex (galley), journal version, to appear in Phys.Rev.D | Phys.Rev. D65 (2002) 104001 | 10.1103/PhysRevD.65.104001 | null | gr-qc | null | Interior perfect fluid solutions for the Reissner-Nordstrom metric are
studied on the basis of a new classification scheme. General formulas are found
in many cases. Explicit new global solutions are given as illustrations. Known
solutions are briefly reviewed.
| [
{
"created": "Thu, 21 Mar 2002 12:43:52 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ivanov",
"B. V.",
""
]
] | Interior perfect fluid solutions for the Reissner-Nordstrom metric are studied on the basis of a new classification scheme. General formulas are found in many cases. Explicit new global solutions are given as illustrations. Known solutions are briefly reviewed. |
2204.08841 | Daniel Mar\'in Pina | D. Mar\'in Pina, M. Orselli and D. Pica | Event Horizon of a Charged Black Hole Binary Merger | 20 pages, 26 figures, for associated animations see
https://github.com/DanielMarinPina/Event-Horizon-of-a-Charged-Black-Hole-Binary-System | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We analyse the formation and evolution of the event horizon of a black hole
binary merger when the black holes are charged. We find that the presence of
charge influences the properties of the merger and can be useful for
investigating the validity of various theories of modified gravity and several
proposals for dar... | [
{
"created": "Tue, 19 Apr 2022 12:13:02 GMT",
"version": "v1"
}
] | 2022-04-20 | [
[
"Pina",
"D. Marín",
""
],
[
"Orselli",
"M.",
""
],
[
"Pica",
"D.",
""
]
] | We analyse the formation and evolution of the event horizon of a black hole binary merger when the black holes are charged. We find that the presence of charge influences the properties of the merger and can be useful for investigating the validity of various theories of modified gravity and several proposals for dark ... |
gr-qc/0702127 | Michael P. Ryan jr | L. Ort\'iz and M. P. Ryan Jr | Quantum collapse of dust shells in 2+1 gravity | 26 pages, 8 figures, in press, General Relativity and Gravitation | Gen.Rel.Grav.39:1087-1107,2007 | 10.1007/s10714-007-0458-7 | null | gr-qc | null | This paper considers the quantum collapse of infinitesimally thin dust shells
in 2+1 gravity. In 2+1 gravity a shell is no longer a sphere but a ring of
matter. The classical equation of motion has been considered by Peleg and Steif
and Cristosomo and Olea. The minisuperspace quantum problem can be reduced to
that of... | [
{
"created": "Sat, 24 Feb 2007 02:42:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ortíz",
"L.",
""
],
[
"Ryan",
"M. P.",
"Jr"
]
] | This paper considers the quantum collapse of infinitesimally thin dust shells in 2+1 gravity. In 2+1 gravity a shell is no longer a sphere but a ring of matter. The classical equation of motion has been considered by Peleg and Steif and Cristosomo and Olea. The minisuperspace quantum problem can be reduced to that of a... |
0908.4330 | Francesco Nicol\`o FN | Giulio Caciotta, Francesco Nicol\`o | The non linear perturbation of the Kerr spacetime in an external region | 118 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove, outside the influence region of a ball of radius $R_0$ centered in
the origin of the initial data hypersurface, the existence of global solutions
near to Kerr spacetime, provided that the initial data are sufficiently near to
those of Kerr; This external region is the "far" part of the outer region of
the p... | [
{
"created": "Sat, 29 Aug 2009 10:15:16 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"Caciotta",
"Giulio",
""
],
[
"Nicolò",
"Francesco",
""
]
] | We prove, outside the influence region of a ball of radius $R_0$ centered in the origin of the initial data hypersurface, the existence of global solutions near to Kerr spacetime, provided that the initial data are sufficiently near to those of Kerr; This external region is the "far" part of the outer region of the per... |
2109.04061 | Ben Whale | Susan M. Scott and Ben E. Whale | What actually happens when you approach a gravitational singularity? | This essay received an Honorable Mention in the 2021 Essay
Competition of the Gravity Research Foundation (see
https://static1.squarespace.com/static/5852e579be659442a01f27b8/t/609d66c823a9a352bc3b24c3/1620928201758/2021-GRF-Abstracts.pdf).
Keywords: Singularity, completion, boundary, endpoint theorem, coordinate... | International Journal of Modern Physics D (2021), 2142007 | 10.1142/S0218271821420074 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Roger Penrose's 2020 Nobel Prize in Physics recognises that his
identification of the concepts of "gravitational singularity" and an
"incomplete, inextendible, null geodesic" is physically very important. The
existence of an incomplete, inextendible, null geodesic doesn't say much,
however, if anything, about curvatu... | [
{
"created": "Thu, 9 Sep 2021 06:57:37 GMT",
"version": "v1"
}
] | 2021-09-10 | [
[
"Scott",
"Susan M.",
""
],
[
"Whale",
"Ben E.",
""
]
] | Roger Penrose's 2020 Nobel Prize in Physics recognises that his identification of the concepts of "gravitational singularity" and an "incomplete, inextendible, null geodesic" is physically very important. The existence of an incomplete, inextendible, null geodesic doesn't say much, however, if anything, about curvature... |
2210.05682 | Alessandro Lupi | Alessandro Lupi | A general relativistic extension to mesh-free methods for hydrodynamics | 17 pages, 15 figures, matches the published version | null | 10.1093/mnras/stac3574 | null | gr-qc astro-ph.IM physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | The detection of gravitational waves has opened a new era for astronomy,
allowing for the combined use of gravitational wave and electromagnetic
emissions to directly probe the physics of compact objects, still poorly
understood. So far, the theoretical modelling of these sources has mainly
relied on standard numeric... | [
{
"created": "Tue, 11 Oct 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jan 2023 08:38:46 GMT",
"version": "v2"
}
] | 2023-01-05 | [
[
"Lupi",
"Alessandro",
""
]
] | The detection of gravitational waves has opened a new era for astronomy, allowing for the combined use of gravitational wave and electromagnetic emissions to directly probe the physics of compact objects, still poorly understood. So far, the theoretical modelling of these sources has mainly relied on standard numerical... |
1112.2840 | Alessandro Nagar | Alessandro Nagar and Sarp Akcay | Horizon-absorbed energy flux in circularized, nonspinning black-hole
binaries and its effective-one-body representation | 14 pages,4 figures. Submitted to Phys. Rev. D | null | 10.1103/PhysRevD.85.044025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose, within the effective one body (EOB) approach, a new, resummed,
analytical representation of the gravitational wave energy flux absorbed by a
system of two circularized (nonspinning) black holes. This expression is such
to be well-behaved in the strong-field, fast motion regime, notably up to the
EOB-defin... | [
{
"created": "Tue, 13 Dec 2011 10:10:44 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Nagar",
"Alessandro",
""
],
[
"Akcay",
"Sarp",
""
]
] | We propose, within the effective one body (EOB) approach, a new, resummed, analytical representation of the gravitational wave energy flux absorbed by a system of two circularized (nonspinning) black holes. This expression is such to be well-behaved in the strong-field, fast motion regime, notably up to the EOB-defined... |
2109.08055 | Rahul Kumar | Rahul Kumar Walia, Sunil D. Maharaj, and Sushant G. Ghosh | Rotating Black Holes in Horndeski Gravity: Thermodynamic and
Gravitational Lensing | 16 pages, 10 figures, and 4 tables. Matched with the published
version | Eur. Phys. J. C (2022) 82:547 | 10.1140/epjc/s10052-022-10451-5 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The lack of rotating black holes, typically found in nature, hinders testing
modified gravity from astrophysical observations. We present the axially
symmetric counterpart of an existing spherical hairy black hole in Horndeski
gravity having an additional deviation parameter $Q$, which encompasses the
Kerr black hole... | [
{
"created": "Thu, 16 Sep 2021 15:39:03 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2022 17:50:12 GMT",
"version": "v2"
}
] | 2022-06-27 | [
[
"Walia",
"Rahul Kumar",
""
],
[
"Maharaj",
"Sunil D.",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | The lack of rotating black holes, typically found in nature, hinders testing modified gravity from astrophysical observations. We present the axially symmetric counterpart of an existing spherical hairy black hole in Horndeski gravity having an additional deviation parameter $Q$, which encompasses the Kerr black hole a... |
0906.2231 | Valentino Lacquaniti | Valentino Lacquaniti, Giovanni Montani | Recent developments on matter dynamics within the Kaluza-Klein picture | 5 pages, Proceedings of The 3rd Stueckelberg Workshop on Relativistic
Field Theories | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we propose a new approach to matter dynamics in compactified
Kaluza-Klein theories. We discard the idea that the motion is geodesic and
perform a simultaneous reduction of matter geometry defining the test particle
via a multipole approach. In the resulting dynamics the tower of huge massive
modes is re... | [
{
"created": "Fri, 12 Jun 2009 00:36:50 GMT",
"version": "v1"
}
] | 2009-06-15 | [
[
"Lacquaniti",
"Valentino",
""
],
[
"Montani",
"Giovanni",
""
]
] | In this paper we propose a new approach to matter dynamics in compactified Kaluza-Klein theories. We discard the idea that the motion is geodesic and perform a simultaneous reduction of matter geometry defining the test particle via a multipole approach. In the resulting dynamics the tower of huge massive modes is remo... |
2305.12545 | Saeed Noori Gashti | Jafar Sadeghi, Saeed Noori Gashti, Mohammad Reza Alipour and Mohammad
Ali S. Afshar | Can black holes cause cosmic expansion? | 12 pages, 2 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Recently, it was shown in [1] that black holes are the source of dark energy.
In [2-5], the truth or falsity of this concept has been discussed. We briefly
state the arguments raised in each of these papers, but our main goal is not to
accept or reject these debates. Rather, in this note, we show that black holes
in ... | [
{
"created": "Sun, 21 May 2023 19:09:47 GMT",
"version": "v1"
}
] | 2023-05-23 | [
[
"Sadeghi",
"Jafar",
""
],
[
"Gashti",
"Saeed Noori",
""
],
[
"Alipour",
"Mohammad Reza",
""
],
[
"Afshar",
"Mohammad Ali S.",
""
]
] | Recently, it was shown in [1] that black holes are the source of dark energy. In [2-5], the truth or falsity of this concept has been discussed. We briefly state the arguments raised in each of these papers, but our main goal is not to accept or reject these debates. Rather, in this note, we show that black holes in sp... |
2305.12891 | Jun Peng | Jun Peng and Xing-Hui Feng | Blandford-Znajek Process in Einsteinian Cubic Gravity | v2: 13 pages, references added | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the Blandford-Znajek (BZ) process within the
framework of Einsteinian cubic gravity (ECG). To analytically study the BZ
process using the split monopole configuration, we construct a slowly rotating
black hole in ECG up to cubic order in small spin, considering the leading
order in small... | [
{
"created": "Mon, 22 May 2023 10:20:22 GMT",
"version": "v1"
},
{
"created": "Sun, 28 May 2023 14:57:37 GMT",
"version": "v2"
}
] | 2023-05-30 | [
[
"Peng",
"Jun",
""
],
[
"Feng",
"Xing-Hui",
""
]
] | In this paper, we investigate the Blandford-Znajek (BZ) process within the framework of Einsteinian cubic gravity (ECG). To analytically study the BZ process using the split monopole configuration, we construct a slowly rotating black hole in ECG up to cubic order in small spin, considering the leading order in small c... |
0711.3131 | Kostyantyn Ropotenko | K. Ropotenko | Kolmogorov-Sinai and Bekenstein-Hawking entropies | 8 pages, no figures; factors in Eqns. (12), (21) corrected; structure
of the paper improved; main results and conclusions unchanged | null | null | null | gr-qc | null | It is shown that instability of stringy matter near the event horizon of a
black hole (the spreading effect) can be characterized by the Lyapunov
exponents. The Kolmogorov-Sinai entropy is the sum of all the positive Lyapunov
exponents and equals to the inverse gravitational radius. Due to a replacement
of the config... | [
{
"created": "Tue, 20 Nov 2007 13:07:10 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2007 08:27:09 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Dec 2007 13:37:41 GMT",
"version": "v3"
}
] | 2011-11-10 | [
[
"Ropotenko",
"K.",
""
]
] | It is shown that instability of stringy matter near the event horizon of a black hole (the spreading effect) can be characterized by the Lyapunov exponents. The Kolmogorov-Sinai entropy is the sum of all the positive Lyapunov exponents and equals to the inverse gravitational radius. Due to a replacement of the configur... |
gr-qc/0507138 | Filimonova Irina V | V.A. Petrov | XXVII International Workshop on High Energy Physics and Field Theory | Proceedings. V.A. Petrov (editor) | null | null | null | gr-qc | null | BLACK HOLES ON EARTH AND IN SPACE
| [
{
"created": "Fri, 29 Jul 2005 11:05:58 GMT",
"version": "v1"
}
] | 2009-03-10 | [
[
"Petrov",
"V. A.",
""
]
] | BLACK HOLES ON EARTH AND IN SPACE |
gr-qc/0506085 | David Maxwell | David Maxwell | Rough Solutions of the Einstein Constraint Equations on Compact
Manifolds | 28 pages, included in Miami Waves 2004 proceedings | J.Hyperbol.Diff.Equat.2:521,2005 | 10.1142/S021989160500049X | null | gr-qc | null | We construct low regularity solutions of the vacuum Einstein constraint
equations on compact manifolds. On 3-manifolds we obtain solutions with metrics
in $H^s$ where $s>3/2$. The constant mean curvature (CMC) conformal method
leads to a construction of all CMC initial data with this level of regularity.
These result... | [
{
"created": "Wed, 15 Jun 2005 20:42:03 GMT",
"version": "v1"
}
] | 2011-04-21 | [
[
"Maxwell",
"David",
""
]
] | We construct low regularity solutions of the vacuum Einstein constraint equations on compact manifolds. On 3-manifolds we obtain solutions with metrics in $H^s$ where $s>3/2$. The constant mean curvature (CMC) conformal method leads to a construction of all CMC initial data with this level of regularity. These results ... |
1310.2302 | Michael Holst | M. Holst, C. Meier, G. Tsogtgerel | Non-CMC Solutions of the Einstein Constraint Equations on Compact
Manifolds with Apparent Horizon Boundaries | 48 pages, no figures. Version 2 is minor revision prior to submission
for publication | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we continue our effort to do a systematic development of the
solution theory for conformal formulations of the Einstein constraint equations
on compact manifolds with boundary. By building in a natural way on our recent
work in Holst and Tsogtgerel (2013), and Holst, Nagy, and Tsogtgerel (2008,
2009),... | [
{
"created": "Tue, 8 Oct 2013 23:06:48 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Oct 2013 01:18:04 GMT",
"version": "v2"
}
] | 2013-10-22 | [
[
"Holst",
"M.",
""
],
[
"Meier",
"C.",
""
],
[
"Tsogtgerel",
"G.",
""
]
] | In this article we continue our effort to do a systematic development of the solution theory for conformal formulations of the Einstein constraint equations on compact manifolds with boundary. By building in a natural way on our recent work in Holst and Tsogtgerel (2013), and Holst, Nagy, and Tsogtgerel (2008, 2009), a... |
1001.4149 | Khaled Saaidi | Kh. Saaidi, A. Vaji, A. Aghamomammadi | Static Spherically Symmetric Solution of (R +- {\mu}^4/R) Gravity | null | Gen. Relativ. Gravit. 42, (2010), 2421 | 10.1007/s10714-010-0989-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The static spherically symmetric solution for (R +- {\mu}^4/R) model of
f(R)gravity is investigated. We obtain the metric for space-time in the solar
system that reduces to the Schwarzschild metric, when {\mu} tends to zero. For
the obtained metric, the deviation from Einstein gravity is very small. This
result is di... | [
{
"created": "Sat, 23 Jan 2010 12:26:18 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Saaidi",
"Kh.",
""
],
[
"Vaji",
"A.",
""
],
[
"Aghamomammadi",
"A.",
""
]
] | The static spherically symmetric solution for (R +- {\mu}^4/R) model of f(R)gravity is investigated. We obtain the metric for space-time in the solar system that reduces to the Schwarzschild metric, when {\mu} tends to zero. For the obtained metric, the deviation from Einstein gravity is very small. This result is diff... |
gr-qc/0208011 | Emanuele Berti | E. Berti, J.A. Pons, G. Miniutti, L. Gualtieri, V. Ferrari | Are Post-Newtonian templates faithful and effectual in detecting
gravitational signals from neutron star binaries? | 14 pages, 3 figures, accepted for publication in Phys. Rev. D | Phys.Rev. D66 (2002) 064013 | 10.1103/PhysRevD.66.064013 | null | gr-qc astro-ph | null | We compute the overlap function between Post-Newtonian (PN) templates and
gravitational signals emitted by binary systems composed of one neutron star
and one point mass, obtained by a perturbative approach. The calculations are
performed for different stellar models and for different detectors, to estimate
how effec... | [
{
"created": "Mon, 5 Aug 2002 10:45:41 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Berti",
"E.",
""
],
[
"Pons",
"J. A.",
""
],
[
"Miniutti",
"G.",
""
],
[
"Gualtieri",
"L.",
""
],
[
"Ferrari",
"V.",
""
]
] | We compute the overlap function between Post-Newtonian (PN) templates and gravitational signals emitted by binary systems composed of one neutron star and one point mass, obtained by a perturbative approach. The calculations are performed for different stellar models and for different detectors, to estimate how effectu... |
0902.4025 | Guilherme de Berredo-Peixoto | G. de Berredo-Peixoto and E.A. de Freitas | On the torsion effects of a relativistic spin fluid in early cosmology | LaTeX file, 15 pages, 2 figures. This is the published version, with
some new and updated references, together with small improvements in the text | Class.Quant.Grav.26:175015,2009 | 10.1088/0264-9381/26/17/175015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the effects of torsion in the framework of
Einstein-Cartan theory in early cosmology. We study solutions for a homogeneous
and isotropic relativistic Weyssenhoff spin fluid with dynamical timelike axial
current, also homogeneous and isotropic. The general solutions can mostly be
described ... | [
{
"created": "Mon, 23 Feb 2009 22:15:35 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2009 12:28:33 GMT",
"version": "v2"
}
] | 2009-10-01 | [
[
"de Berredo-Peixoto",
"G.",
""
],
[
"de Freitas",
"E. A.",
""
]
] | In this work we investigate the effects of torsion in the framework of Einstein-Cartan theory in early cosmology. We study solutions for a homogeneous and isotropic relativistic Weyssenhoff spin fluid with dynamical timelike axial current, also homogeneous and isotropic. The general solutions can mostly be described by... |
1607.07726 | S. I. Kruglov | S.I. Kruglov | Nonlinear $\arcsin$-electrodynamics and asymptotic Reissner-Nordstr\"om
black holes | 19 pages, 4 figures, to appear in Ann. Phys. (Berlin) | Ann. Phys .(Berlin), Vol.528, 588 (2016) | 10.1002/andp.201600027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model of nonlinear electrodynamics with the Lagrangian density ${\cal L} =
-(1/\beta)\arcsin(\beta F_{\mu\nu}F^{\mu\nu}/4)$ is proposed. The scale
invariance and the dual invariance of electromagnetic fields are broken in the
model. In the limit $\beta\rightarrow 0$ one comes to Maxwell's electrodynamics
and the sc... | [
{
"created": "Fri, 22 Jul 2016 21:40:16 GMT",
"version": "v1"
}
] | 2016-08-05 | [
[
"Kruglov",
"S. I.",
""
]
] | A model of nonlinear electrodynamics with the Lagrangian density ${\cal L} = -(1/\beta)\arcsin(\beta F_{\mu\nu}F^{\mu\nu}/4)$ is proposed. The scale invariance and the dual invariance of electromagnetic fields are broken in the model. In the limit $\beta\rightarrow 0$ one comes to Maxwell's electrodynamics and the scal... |
2306.10934 | Matteo Bruno | Matteo Bruno and Giovanni Montani | Is the diagonal case a general picture for Loop Quantum Cosmology? | 6 pages | null | 10.1103/PhysRevD.108.046003 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | The correct implementation of the Loop Quantum Gravity to the early
homogeneous Universe has been the subject of a long debate in the literature
because the SU(2) symmetry cannot be properly retained. The role of this
symmetry is expressed by the Gauss constraint. Here, a non-vanishing Gauss
constraint is found. Howe... | [
{
"created": "Mon, 19 Jun 2023 13:47:37 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2023 13:23:51 GMT",
"version": "v2"
}
] | 2023-08-16 | [
[
"Bruno",
"Matteo",
""
],
[
"Montani",
"Giovanni",
""
]
] | The correct implementation of the Loop Quantum Gravity to the early homogeneous Universe has been the subject of a long debate in the literature because the SU(2) symmetry cannot be properly retained. The role of this symmetry is expressed by the Gauss constraint. Here, a non-vanishing Gauss constraint is found. Howeve... |
gr-qc/0604106 | Simon Dawson | S P Dawson and C J Fewster | An explicit quantum weak energy inequality for Dirac fields in curved
spacetimes | 24 pages, 0 figures | Class.Quant.Grav.23:6659-6681,2006 | 10.1088/0264-9381/23/23/005 | null | gr-qc | null | The quantized Dirac field is known, by a result of Fewster and Verch, to
satisfy a Quantum Weak Energy Inequality (QWEI) on its averaged energy density
along time-like curves in arbitrary four-dimensional globally hyperbolic
spacetimes. However, this result does not provide an explicit form for the
bound. By adapting... | [
{
"created": "Tue, 25 Apr 2006 11:29:02 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2006 20:34:00 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Dawson",
"S P",
""
],
[
"Fewster",
"C J",
""
]
] | The quantized Dirac field is known, by a result of Fewster and Verch, to satisfy a Quantum Weak Energy Inequality (QWEI) on its averaged energy density along time-like curves in arbitrary four-dimensional globally hyperbolic spacetimes. However, this result does not provide an explicit form for the bound. By adapting i... |
1511.02824 | Lode Wylleman | Lode Wylleman | Finalizing the classification of type II or more special Einstein
spacetimes in five dimensions | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein spacetimes in 5d that are of genuine type II in the null alignment
classification are considered. It is shown that the unique geodesic multiple
Weyl aligned null direction (mWAND) cannot have an optical matrix of rank 1 or
3. This finalizes the classification of all type II or more special Einstein
spacetime... | [
{
"created": "Mon, 9 Nov 2015 20:11:49 GMT",
"version": "v1"
}
] | 2015-11-10 | [
[
"Wylleman",
"Lode",
""
]
] | Einstein spacetimes in 5d that are of genuine type II in the null alignment classification are considered. It is shown that the unique geodesic multiple Weyl aligned null direction (mWAND) cannot have an optical matrix of rank 1 or 3. This finalizes the classification of all type II or more special Einstein spacetimes ... |
1610.09886 | Meng-Sen Ma | Li-Chun Zhang, Ren Zhao, Meng-Sen Ma | Entropy of Reissner-Nordstr\"om-de Sitter black hole | 3 pages, 2 figures. In the published version, there are some errors
in the equations (13-15). We correct them in this version. The conclusion is
not affected | Physics Letters B, 761, 74(2016) | 10.1016/j.physletb.2016.08.013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the consideration that the black hole horizon and the cosmological
horizon of Reissner-Nordstr\"om black hole in de Sitter space are not
independent each other, we conjecture the total entropy of the system should
have an extra term contributed from the entanglement between the two horizons,
except for the s... | [
{
"created": "Mon, 31 Oct 2016 12:05:38 GMT",
"version": "v1"
}
] | 2016-11-01 | [
[
"Zhang",
"Li-Chun",
""
],
[
"Zhao",
"Ren",
""
],
[
"Ma",
"Meng-Sen",
""
]
] | Based on the consideration that the black hole horizon and the cosmological horizon of Reissner-Nordstr\"om black hole in de Sitter space are not independent each other, we conjecture the total entropy of the system should have an extra term contributed from the entanglement between the two horizons, except for the sum... |
2207.10578 | Niloufar Feyzabadi | Nahid Ahmadi, Mahdiyar Noorbala, Niloufar Feyzabadi, Fatemeh
Eghbalpoor, Zahra Ahmadi | Quantum Diffusion in Sharp Transition to Non-Slow-Roll Phase | 31 pages, 7 figures | null | 10.1088/1475-7516/2022/08/078 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Transitions between different inflationary slow-roll scenarios are known to
provide short non-slow-roll periods with non-trivial consequences. We consider
the effect of quantum diffusion on the inflationary dynamics in a transition
process. Using the stochastic {\delta}N formalism, we follow the detailed
evolution of... | [
{
"created": "Wed, 20 Jul 2022 16:45:45 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Ahmadi",
"Nahid",
""
],
[
"Noorbala",
"Mahdiyar",
""
],
[
"Feyzabadi",
"Niloufar",
""
],
[
"Eghbalpoor",
"Fatemeh",
""
],
[
"Ahmadi",
"Zahra",
""
]
] | Transitions between different inflationary slow-roll scenarios are known to provide short non-slow-roll periods with non-trivial consequences. We consider the effect of quantum diffusion on the inflationary dynamics in a transition process. Using the stochastic {\delta}N formalism, we follow the detailed evolution of n... |
1904.11341 | Milan Milosevic | Marko A. Dimitrijevi\'c, Dragoljub D. Dimitrijevi\'c, Goran Djordjevic
and Milan Milo\v{s}evi\'c | Constrained Dynamics of Tachyon Field in FRWL Spacetime | 10 pages, to be published in the Special Issue of the Facta
Universitatis Series: Physics, Chemistry and Technology devoted to the
SEENET-MTP Balkan Workshop BSW2019 (3-14 June 2018, Nis, Serbia) | Facta Universitatis Series: Physics, Chemistry and Technology Vol.
17, No 1, Special Issue, 2019, pp. 21 - 30 | 10.2298/FUPCT1901021D | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we continue study of tachyon scalar field described by a
Dirac-Born-Infeld (DBI) type action with constraints in the cosmological
context. The proposed extension of the system introducing an auxiliary field in
the minisuperspace framework is discussed. A new equivalent set of constraints
is constructed,... | [
{
"created": "Thu, 25 Apr 2019 13:53:17 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Oct 2019 08:08:50 GMT",
"version": "v2"
}
] | 2019-10-18 | [
[
"Dimitrijević",
"Marko A.",
""
],
[
"Dimitrijević",
"Dragoljub D.",
""
],
[
"Djordjevic",
"Goran",
""
],
[
"Milošević",
"Milan",
""
]
] | In this paper we continue study of tachyon scalar field described by a Dirac-Born-Infeld (DBI) type action with constraints in the cosmological context. The proposed extension of the system introducing an auxiliary field in the minisuperspace framework is discussed. A new equivalent set of constraints is constructed, s... |
gr-qc/0107098 | Jose' P. S. Lemos | Vitor Cardoso, Jose' P. S. Lemos | Quasi-normal modes of toroidal, cylindrical and planar black holes in
anti-de Sitter spacetimes: scalar, electromagnetic and gravitational
perturbations | Latex, 16 pages. Minor changes | Class.Quant.Grav. 18 (2001) 5257-5267 | 10.1088/0264-9381/18/23/319 | DF-IST/7.2001 | gr-qc hep-th | null | We study the quasi-normal modes (QNM) of scalar, electromagnetic and
gravitational perturbations of black holes in general relativity whose horizons
have toroidal, cylindrical or planar topology in an asymptotically anti-de
Sitter (AdS) spacetime. The associated quasinormal frequencies describe the
decay in time of t... | [
{
"created": "Mon, 30 Jul 2001 14:33:47 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2001 19:34:00 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Cardoso",
"Vitor",
""
],
[
"Lemos",
"Jose' P. S.",
""
]
] | We study the quasi-normal modes (QNM) of scalar, electromagnetic and gravitational perturbations of black holes in general relativity whose horizons have toroidal, cylindrical or planar topology in an asymptotically anti-de Sitter (AdS) spacetime. The associated quasinormal frequencies describe the decay in time of the... |
1506.04267 | Ran Li | Ran Li, Yu Tian, Hongbao Zhang, and Junkun Zhao | Time domain analysis of superradiant instability for the charged stringy
black hole-mirror system | 7 pages, 6 figures, and 5 tables. References added | Phys. Lett. B 750(2015)520 | 10.1016/j.physletb.2015.09.073 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been proved that the charged stringy black holes are stable under the
perturbations of massive charged scalar fields. However, superradiant
instability can be generated by adding the mirror-like boundary condition to
the composed system of charged stringy black hole and scalar field. The
unstable boxed quasino... | [
{
"created": "Sat, 13 Jun 2015 13:11:58 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2015 01:49:48 GMT",
"version": "v2"
}
] | 2016-05-20 | [
[
"Li",
"Ran",
""
],
[
"Tian",
"Yu",
""
],
[
"Zhang",
"Hongbao",
""
],
[
"Zhao",
"Junkun",
""
]
] | It has been proved that the charged stringy black holes are stable under the perturbations of massive charged scalar fields. However, superradiant instability can be generated by adding the mirror-like boundary condition to the composed system of charged stringy black hole and scalar field. The unstable boxed quasinorm... |
1312.3510 | Pierre Teyssandier | Pierre Teyssandier and Bernard Linet | Enhanced term of order $G^3$ in the light travel time: discussion for
some solar system experiments | 4 pages, Proceedings of the Conference "Journ\'ees 2013 Syst\`emes de
r\'ef\'erence spatio-temporels (scientific developments from highly accurate
space-time reference systems)", 16-18 September 2013, Observatoire de Paris,
France | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is generally believed that knowing the light travel time up to the
post-post-Minkowskian level (terms in $G^2$) is sufficient for modelling the
most accurate experiments designed to test general relativity in a foreseeable
future. However, we have recently brought a rigorous justification of the
existence of an en... | [
{
"created": "Thu, 12 Dec 2013 15:00:20 GMT",
"version": "v1"
}
] | 2013-12-13 | [
[
"Teyssandier",
"Pierre",
""
],
[
"Linet",
"Bernard",
""
]
] | It is generally believed that knowing the light travel time up to the post-post-Minkowskian level (terms in $G^2$) is sufficient for modelling the most accurate experiments designed to test general relativity in a foreseeable future. However, we have recently brought a rigorous justification of the existence of an enha... |
2103.07718 | Daniele Gregoris | Saikat Chakraborty, Daniele Gregoris | Cosmological evolution with quadratic gravity and nonideal fluids | Matches published version | EPJC (2021) 81:944 | 10.1140/epjc/s10052-021-09697-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some cosmological models based on the gravitational theory $f(R) = R+\zeta
R^2$, and on fluids obeying to the equations of state of Redlich-Kwong,
Berthelot, and Dieterici are proposed for describing smooth transitions between
different cosmic epochs. A dynamical system analysis reveals that these models
contain fixe... | [
{
"created": "Sat, 13 Mar 2021 13:34:22 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Aug 2021 12:39:25 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Oct 2021 12:37:18 GMT",
"version": "v3"
}
] | 2021-10-27 | [
[
"Chakraborty",
"Saikat",
""
],
[
"Gregoris",
"Daniele",
""
]
] | Some cosmological models based on the gravitational theory $f(R) = R+\zeta R^2$, and on fluids obeying to the equations of state of Redlich-Kwong, Berthelot, and Dieterici are proposed for describing smooth transitions between different cosmic epochs. A dynamical system analysis reveals that these models contain fixed ... |
2004.05841 | Etera R. Livine | Jibril Ben Achour, Etera R. Livine | The Cosmological Constant from Conformal Transformations: M\"{o}bius
Invariance and Schwarzian Action | 16 pages, last version (published in CQG): title changed and a
section added on the physical implications of the new conformally-invariant
cosmological model | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The homogeneous Friedman-Lema\^\i tre-Robertson-Walker (FLRW) cosmology of a
free scalar field with vanishing cosmological constant was recently shown to be
invariant under the one-dimensional conformal group $\textrm{SL}(2,\mathbb{R})$
acting as M{\"o}bius transformations on the proper time. Here we generalize
this ... | [
{
"created": "Mon, 13 Apr 2020 09:41:16 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2020 09:46:09 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Sep 2020 12:15:57 GMT",
"version": "v3"
}
] | 2020-09-17 | [
[
"Achour",
"Jibril Ben",
""
],
[
"Livine",
"Etera R.",
""
]
] | The homogeneous Friedman-Lema\^\i tre-Robertson-Walker (FLRW) cosmology of a free scalar field with vanishing cosmological constant was recently shown to be invariant under the one-dimensional conformal group $\textrm{SL}(2,\mathbb{R})$ acting as M{\"o}bius transformations on the proper time. Here we generalize this an... |
1912.08093 | Gianmassimo Tasinato | Alice Garoffolo, Gianmassimo Tasinato, Carmelita Carbone, Daniele
Bertacca, Sabino Matarrese | Gravitational waves and geometrical optics in scalar-tensor theories | 42 pages. V2: Improved discussion, in particular on gauge conditions,
and references added. Results unchanged. V3: Updated version to be published
in JCAP | null | 10.1088/1475-7516/2020/11/040 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of gravitational waves (GWs) propagating through cosmic
structures can provide invaluable information on the geometry and content of
our Universe, as well as on the fundamental theory of gravity. In order to test
possible departures from General Relativity, it is essential to analyse, in a
modified grav... | [
{
"created": "Mon, 16 Dec 2019 15:38:28 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2020 18:08:56 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Sep 2020 10:10:18 GMT",
"version": "v3"
}
] | 2020-11-25 | [
[
"Garoffolo",
"Alice",
""
],
[
"Tasinato",
"Gianmassimo",
""
],
[
"Carbone",
"Carmelita",
""
],
[
"Bertacca",
"Daniele",
""
],
[
"Matarrese",
"Sabino",
""
]
] | The detection of gravitational waves (GWs) propagating through cosmic structures can provide invaluable information on the geometry and content of our Universe, as well as on the fundamental theory of gravity. In order to test possible departures from General Relativity, it is essential to analyse, in a modified gravit... |
gr-qc/0407030 | Muraari Vasudevan | Muraari Vasudevan, Kory A. Stevens, Don N. Page | Particle Motion and Scalar Field Propagation in Myers-Perry Black Hole
Spacetimes in All Dimensions | 16 pages, LaTeX2e | Class.Quant.Grav. 22 (2005) 1469-1482 | 10.1088/0264-9381/22/7/017 | Alberta Thy 15-04 | gr-qc hep-th | null | We study separability of the Hamilton-Jacobi and massive Klein-Gordon
equations in the general Myers-Perry black hole background in all dimensions.
Complete separation of both equations is carried out in cases when there are
two sets of equal black hole rotation parameters, which significantly enlarges
the rotational... | [
{
"created": "Wed, 7 Jul 2004 22:49:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vasudevan",
"Muraari",
""
],
[
"Stevens",
"Kory A.",
""
],
[
"Page",
"Don N.",
""
]
] | We study separability of the Hamilton-Jacobi and massive Klein-Gordon equations in the general Myers-Perry black hole background in all dimensions. Complete separation of both equations is carried out in cases when there are two sets of equal black hole rotation parameters, which significantly enlarges the rotational s... |
1809.02516 | Chris Kavanagh | Donato Bini, Thibault Damour, Andrea Geralico, Chris Kavanagh, Maarten
van de Meent | Gravitational self-force corrections to gyroscope precession along
circular orbits in the Kerr spacetime | 11 pages, 3 figures | Phys. Rev. D 98, 104062 (2018) | 10.1103/PhysRevD.98.104062 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize to Kerr spacetime previous gravitational self-force results on
gyroscope precession along circular orbits in the Schwarzschild spacetime. In
particular we present high order post- Newtonian expansions for the gauge
invariant precession function along circular geodesics valid for arbitrary Kerr
spin para... | [
{
"created": "Fri, 7 Sep 2018 14:52:57 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Kavanagh",
"Chris",
""
],
[
"van de Meent",
"Maarten",
""
]
] | We generalize to Kerr spacetime previous gravitational self-force results on gyroscope precession along circular orbits in the Schwarzschild spacetime. In particular we present high order post- Newtonian expansions for the gauge invariant precession function along circular geodesics valid for arbitrary Kerr spin parame... |
gr-qc/0412134 | M. Blagojevic | M. Blagojevic and B. Cvetkovic | Canonical structure of 3D gravity with torsion | LaTeX, 21 pages | Trends in GR and QC, vol. 2, ed. Ch. Benton (Nova Science, NY,
2006) 103-123 | null | null | gr-qc hep-th | null | We study the canonical structure of the topological 3D gravity with torsion,
assuming the anti-de Sitter asymptotic conditions. It is shown that the Poisson
bracket algebra of the canonical generators has the form of two independent
Virasoro algebras with classical central charges. In contrast to the case of
general ... | [
{
"created": "Thu, 30 Dec 2004 14:36:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blagojevic",
"M.",
""
],
[
"Cvetkovic",
"B.",
""
]
] | We study the canonical structure of the topological 3D gravity with torsion, assuming the anti-de Sitter asymptotic conditions. It is shown that the Poisson bracket algebra of the canonical generators has the form of two independent Virasoro algebras with classical central charges. In contrast to the case of general re... |
gr-qc/9810080 | William Krivan | W. Krivan, R.H. Price (University of Utah) | Formation of a rotating hole from a close limit head-on collision | 4 pages, 4 figures, submitted to PRL | Phys.Rev.Lett.82:1358-1361,1999 | 10.1103/PhysRevLett.82.1358 | null | gr-qc | null | Realistic black hole collisions result in a rapidly rotating Kerr hole, but
simulations to date have focused on nonrotating final holes. Using a new
solution of the Einstein initial value equations we present here waveforms and
radiation for an axisymmetric Kerr-hole-forming collision starting from small
initial sepa... | [
{
"created": "Mon, 26 Oct 1998 18:42:44 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Krivan",
"W.",
"",
"University of Utah"
],
[
"Price",
"R. H.",
"",
"University of Utah"
]
] | Realistic black hole collisions result in a rapidly rotating Kerr hole, but simulations to date have focused on nonrotating final holes. Using a new solution of the Einstein initial value equations we present here waveforms and radiation for an axisymmetric Kerr-hole-forming collision starting from small initial separa... |
gr-qc/0310103 | Iver. H. Brevik | I. Brevik, K. B{\o}rkje and J. P. Morten | Two-Brane Randall-Sundrum Model in AdS_5 and dS_5 | 12 pages, no figures; revised discussion in section III on negative
energy densities | Gen.Rel.Grav.36:2021-2038,2004 | 10.1023/B:GERG.0000038468.40244.29 | null | gr-qc hep-th | null | Two flat Randall - Sundrum three-branes are analyzed, at fixed mutual
distance, in the case where each brane contains an ideal isotropic fluid. Both
fluids are to begin with assumed to obey the equation of state p=(\gamma
-1)\rho, where \gamma is a constant. Thereafter, we impose the condition that
there is zero ener... | [
{
"created": "Wed, 22 Oct 2003 08:35:15 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Feb 2004 17:34:41 GMT",
"version": "v2"
}
] | 2009-01-14 | [
[
"Brevik",
"I.",
""
],
[
"Børkje",
"K.",
""
],
[
"Morten",
"J. P.",
""
]
] | Two flat Randall - Sundrum three-branes are analyzed, at fixed mutual distance, in the case where each brane contains an ideal isotropic fluid. Both fluids are to begin with assumed to obey the equation of state p=(\gamma -1)\rho, where \gamma is a constant. Thereafter, we impose the condition that there is zero energy... |
gr-qc/9606070 | Haret Rosu | H. Rosu | Superoscillations and trans-Planckian frequencies | twocolumn style | Nuovo Cim. B112 (1997) 131-132 | null | null | gr-qc hep-th quant-ph | null | Superoscillations can explain the arbitrarily high frequencies' paradox in
black hole radiation
| [
{
"created": "Mon, 24 Jun 1996 18:41:00 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Apr 1997 18:27:43 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Rosu",
"H.",
""
]
] | Superoscillations can explain the arbitrarily high frequencies' paradox in black hole radiation |
1005.2985 | Matteo Smerlak | Carlo Rovelli, Matteo Smerlak | Thermal time and the Tolman-Ehrenfest effect: temperature as the "speed
of time" | 4 pages; sharpened discussion of the underlying physical assumptions | Class.Quant.Grav.28:075007,2011 | 10.1088/0264-9381/28/7/075007 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notion of thermal time has been introduced as a possible basis for a
fully general-relativistic thermodynamics. Here we study this notion in the
restricted context of stationary spacetimes. We show that the Tolman-Ehrenfest
effect (in a stationary gravitational field, temperature is not constant in
space at therm... | [
{
"created": "Mon, 17 May 2010 17:37:32 GMT",
"version": "v1"
},
{
"created": "Thu, 20 May 2010 09:04:41 GMT",
"version": "v2"
},
{
"created": "Tue, 25 May 2010 14:52:25 GMT",
"version": "v3"
},
{
"created": "Mon, 17 Jan 2011 15:42:28 GMT",
"version": "v4"
},
{
"c... | 2011-03-14 | [
[
"Rovelli",
"Carlo",
""
],
[
"Smerlak",
"Matteo",
""
]
] | The notion of thermal time has been introduced as a possible basis for a fully general-relativistic thermodynamics. Here we study this notion in the restricted context of stationary spacetimes. We show that the Tolman-Ehrenfest effect (in a stationary gravitational field, temperature is not constant in space at thermal... |
2001.03106 | Yu-Xiao Liu | Si-Jiang Yang, Jing Chen, Jun-Jie Wan, Shao-Wen Wei, Yu-Xiao Liu | Weak cosmic censorship conjecture for Kerr-Taub-NUT black hole with test
scalar field and particle | 11 pages, 1 figure | Phys. Rev. D 101, 064048 (2020) | 10.1103/PhysRevD.101.064048 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent researches of black holes with NUT charge, we
investigate the validity of the weak cosmic censorship conjecture for
Kerr-Taub-NUT black hole with a test massive scalar field and a test particle,
respectively. For the scalar field scattering gedanken experiment, we consider
an infinitesimal tim... | [
{
"created": "Thu, 9 Jan 2020 17:06:02 GMT",
"version": "v1"
}
] | 2020-04-01 | [
[
"Yang",
"Si-Jiang",
""
],
[
"Chen",
"Jing",
""
],
[
"Wan",
"Jun-Jie",
""
],
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Motivated by the recent researches of black holes with NUT charge, we investigate the validity of the weak cosmic censorship conjecture for Kerr-Taub-NUT black hole with a test massive scalar field and a test particle, respectively. For the scalar field scattering gedanken experiment, we consider an infinitesimal time ... |
gr-qc/9710036 | Paulo Rodrigues Lima Vargas Moniz | O. Bertolami, P.D. Fonseca and P.V. Moniz | Quantum Analysis of the Compactification Process in the Multidimensional
Einstein-Yang-Mills System | 3 pages, LaTeX, requires mprocl.sty available at
http://shemesh.fiz.huji.ac.il/MG8/submission.html, talk given in the Quantum
Cosmology at the MG8 conference | null | null | null | gr-qc | null | We study solutions of the Wheeler-DeWitt equation obtained when considering
homogeneous and isotropic (up to a gauge transformation) field configurations
of the Einstein-Yang-Mills system in $D=4+d$ dimensions with an $R \times S^3
\times S^d$ topology and assuming the Hartle-Hawking boundary conditions.
| [
{
"created": "Tue, 7 Oct 1997 09:06:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bertolami",
"O.",
""
],
[
"Fonseca",
"P. D.",
""
],
[
"Moniz",
"P. V.",
""
]
] | We study solutions of the Wheeler-DeWitt equation obtained when considering homogeneous and isotropic (up to a gauge transformation) field configurations of the Einstein-Yang-Mills system in $D=4+d$ dimensions with an $R \times S^3 \times S^d$ topology and assuming the Hartle-Hawking boundary conditions. |
1503.07420 | Hassan Amirhashchi | Hassan Amirhashchi | Constraints on The Dark Energy Equation of State And The Deceleration
Parameter From Recent Cosmic Observations | 8 pages, 10 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints on dark energy equation of state $\omega^{X}$ and
the deceleration parameter $q$ from the recent observational data including
Hubble data and the cosmic microwave background (CMB) radiation by using a
model-independent deceleration parameter $q(z)=1/2-a/(1+z)^b$ and dark energy
equation of st... | [
{
"created": "Sun, 22 Mar 2015 08:11:45 GMT",
"version": "v1"
}
] | 2015-03-26 | [
[
"Amirhashchi",
"Hassan",
""
]
] | We study the constraints on dark energy equation of state $\omega^{X}$ and the deceleration parameter $q$ from the recent observational data including Hubble data and the cosmic microwave background (CMB) radiation by using a model-independent deceleration parameter $q(z)=1/2-a/(1+z)^b$ and dark energy equation of stat... |
1805.07840 | Luiz Carlos Leite | Luiz C. S. Leite, Sam Dolan, and Lu\'is C. B. Crispino | Absorption of electromagnetic plane waves by rotating black holes | 11 pages, 8 figures. Comments are welcome | Phys. Rev. D 98, 024046 (2018) | 10.1103/PhysRevD.98.024046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the absorption of monochromatic electromagnetic plane waves
impinging upon a Kerr black hole, in the general case that the direction of
incidence is not aligned with the black hole spin axis. We present numerical
results that are in accord with low- and high-frequency approximations. We find
that circularly-... | [
{
"created": "Sun, 20 May 2018 23:31:19 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Leite",
"Luiz C. S.",
""
],
[
"Dolan",
"Sam",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | We study the absorption of monochromatic electromagnetic plane waves impinging upon a Kerr black hole, in the general case that the direction of incidence is not aligned with the black hole spin axis. We present numerical results that are in accord with low- and high-frequency approximations. We find that circularly-po... |
gr-qc/0412092 | Belinch\'on Jos\'e Antonio | J.A. Belinch\'on | On the equation of state of a flat FRW model filled with a bulk viscous
fluid | 12 pages, Revtex4 | null | null | null | gr-qc | null | In this paper, we study the equation of state admissible for a flat FRW
models filled with a bulk viscous fluid by using the Lie group method. It is
founded that the model admits scaling symmetries iff the bulk viscous parameter
$\gamma =1/2$. In this case, it is found that the main quantities follow a
power law solu... | [
{
"created": "Sun, 19 Dec 2004 17:20:42 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Nov 2005 20:12:38 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Belinchón",
"J. A.",
""
]
] | In this paper, we study the equation of state admissible for a flat FRW models filled with a bulk viscous fluid by using the Lie group method. It is founded that the model admits scaling symmetries iff the bulk viscous parameter $\gamma =1/2$. In this case, it is found that the main quantities follow a power law soluti... |
2110.02689 | Gregory Ashton | Gregory Ashton, Sarah Thiele, Yannick Lecoeuche, Jess McIver, and
Laura K Nuttall | Parameterised population models of transient non-Gaussian noise in the
LIGO gravitational-wave detectors | 15 pages, submitted to Phys. Rev. D | null | 10.1088/1361-6382/ac8094 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The two interferometric LIGO gravitational-wave observatories provide the
most sensitive data to date to study the gravitational-wave Universe. As part
of a global network, they have just completed their third observing run in
which they observed many tens of signals from merging compact binary systems.
It has long b... | [
{
"created": "Wed, 6 Oct 2021 12:24:07 GMT",
"version": "v1"
}
] | 2022-08-24 | [
[
"Ashton",
"Gregory",
""
],
[
"Thiele",
"Sarah",
""
],
[
"Lecoeuche",
"Yannick",
""
],
[
"McIver",
"Jess",
""
],
[
"Nuttall",
"Laura K",
""
]
] | The two interferometric LIGO gravitational-wave observatories provide the most sensitive data to date to study the gravitational-wave Universe. As part of a global network, they have just completed their third observing run in which they observed many tens of signals from merging compact binary systems. It has long bee... |
2001.11335 | Hideki Maeda | Hideki Maeda | Nonstaticity with type II, III, or IV matter field in
$f(R_{\mu\nu\rho\sigma},g^{\mu\nu})$ gravity | 3 pages, 1 table, no figure; v3, fully revised version with a title
slightly changed again, published in General Relativity and Gravitation | General Relativity and Gravitation 53, 90 (2021) | 10.1007/s10714-021-02862-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In all $n(\ge 3)$-dimensional gravitation theories whose Lagrangians are
functions of the Riemann tensor and metric, we show that static solutions are
absent unless the total energy-momentum tensor for matter fields is of type I
in the Hawking-Ellis classification. In other words, there is no
hypersurface-orthogonal ... | [
{
"created": "Wed, 29 Jan 2020 10:52:49 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Mar 2020 07:38:22 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Nov 2021 09:20:53 GMT",
"version": "v3"
}
] | 2021-11-02 | [
[
"Maeda",
"Hideki",
""
]
] | In all $n(\ge 3)$-dimensional gravitation theories whose Lagrangians are functions of the Riemann tensor and metric, we show that static solutions are absent unless the total energy-momentum tensor for matter fields is of type I in the Hawking-Ellis classification. In other words, there is no hypersurface-orthogonal ti... |
2003.07788 | Alexander Zhidenko | R. A. Konoplya and A. Zhidenko | Black holes in the four-dimensional Einstein-Lovelock gravity | 5 pages, 1 ancillary Mathematica(R) notebook | Phys. Rev. D 101, 084038 (2020) | 10.1103/PhysRevD.101.084038 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A $(3+1)$-dimensional Einstein-Gauss-Bonnet theory of gravity has been
recently formulated in [D. Glavan and C. Lin, Phys. Rev. Lett. {\bf 124},
081301 (2020)] which is different from the pure Einstein theory, i.e., bypasses
the Lovelock's theorem and avoids Ostrogradsky instability. The theory was
formulated in $D >... | [
{
"created": "Tue, 17 Mar 2020 16:11:56 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2020 10:00:06 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Sep 2020 16:32:13 GMT",
"version": "v3"
}
] | 2020-09-21 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | A $(3+1)$-dimensional Einstein-Gauss-Bonnet theory of gravity has been recently formulated in [D. Glavan and C. Lin, Phys. Rev. Lett. {\bf 124}, 081301 (2020)] which is different from the pure Einstein theory, i.e., bypasses the Lovelock's theorem and avoids Ostrogradsky instability. The theory was formulated in $D > 4... |
2304.07353 | Anzhong Wang | N. O. Santos and Anzhong Wang | Cylindrically Symmetric Fields in General Relativity | no figures and tables. Plain TeX file. arXiv admin note: substantial
text overlap with arXiv:1901.06561 | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We present a brief review of exact solutions of cylindrical symmetric fields
in General Relativity produced by different perfect fluid sources. These
sources are assumed static, stationary, translating and collapsing. Properties
of these fields are discussed and some important open questions are called the
attention ... | [
{
"created": "Fri, 14 Apr 2023 19:09:50 GMT",
"version": "v1"
}
] | 2023-04-18 | [
[
"Santos",
"N. O.",
""
],
[
"Wang",
"Anzhong",
""
]
] | We present a brief review of exact solutions of cylindrical symmetric fields in General Relativity produced by different perfect fluid sources. These sources are assumed static, stationary, translating and collapsing. Properties of these fields are discussed and some important open questions are called the attention fo... |
1601.07310 | Bibhas Majhi Ranjan | Avik Paul, Bibhas Ranjan Majhi | Hawking evaporation cascade in presence of back reaction effect | New comments and refs. added, to appear in Int.J.Mod.Phys. A | Int.J.Mod.Phys. A32 (2017) 1750088 | 10.1142/S0217751X17500889 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cascade of Hawking emission spectrum from the event horizon in
presence of one loop back reaction effect in a black hole background. The
spacetime is taken here is the modified Schwarzschild one. The analysis shows
that it is possible to decrease the sparsity with the decrease in black hole
mass. Moreove... | [
{
"created": "Wed, 27 Jan 2016 10:06:40 GMT",
"version": "v1"
},
{
"created": "Fri, 12 May 2017 04:46:35 GMT",
"version": "v2"
}
] | 2017-05-31 | [
[
"Paul",
"Avik",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | We study the cascade of Hawking emission spectrum from the event horizon in presence of one loop back reaction effect in a black hole background. The spacetime is taken here is the modified Schwarzschild one. The analysis shows that it is possible to decrease the sparsity with the decrease in black hole mass. Moreover,... |
1607.08830 | Alexei Nurmagambetov | Tatiana Moskalets, Alexei Nurmagambetov | Absorption cross-sections of small quasi-spherical black holes: the
massless scalar case | 28 pages, no Figs; v2.: Refs added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider effects of non-uniformity of quasi-spherical small black hole
horizons on scattering massless spineless particles in the long-wave
approximation. Focusing on 4D flat and AdS neutral black hole backgrounds with
conformally spherical geometry of the horizon, we observe the notable
differences in compare to ... | [
{
"created": "Fri, 29 Jul 2016 14:37:43 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2016 13:43:32 GMT",
"version": "v2"
}
] | 2016-08-15 | [
[
"Moskalets",
"Tatiana",
""
],
[
"Nurmagambetov",
"Alexei",
""
]
] | We consider effects of non-uniformity of quasi-spherical small black hole horizons on scattering massless spineless particles in the long-wave approximation. Focusing on 4D flat and AdS neutral black hole backgrounds with conformally spherical geometry of the horizon, we observe the notable differences in compare to th... |
gr-qc/0110010 | A. Calogeracos | A. Calogeracos (Division of Theoretical Mechanics, Hellenic Air Force
Academy, Greece) | Radiation from perfect mirrors starting from rest and the black body
spectrum | Typos corrected | J.Phys.A35:3435-3446,2002 | 10.1088/0305-4470/35/15/306 | null | gr-qc quant-ph | null | We address the question of radiation emission from a perfect mirror that
starts from rest and follows the trajectory z=-ln(cosht) till t->Infinity. We
show that a correct derivation of the black body spectrum via the calculation
of the Bogolubov amplitudes requires consideration of the whole trajectory and
not just o... | [
{
"created": "Mon, 1 Oct 2001 14:04:40 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Mar 2002 17:19:56 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Mar 2002 13:16:12 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Calogeracos",
"A.",
"",
"Division of Theoretical Mechanics, Hellenic Air Force\n Academy, Greece"
]
] | We address the question of radiation emission from a perfect mirror that starts from rest and follows the trajectory z=-ln(cosht) till t->Infinity. We show that a correct derivation of the black body spectrum via the calculation of the Bogolubov amplitudes requires consideration of the whole trajectory and not just of ... |
1512.04886 | Yu Shi | Yue Dai, Zhejun Shen, Yu Shi | Quantum entanglement in three accelerating qubits coupled to scalar
field | 24 pages | Phys. Rev. D 94, 025012 (2016) | 10.1103/PhysRevD.94.025012 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider quantum entanglement of three accelerating qubits, each of which
is locally coupled with a real scalar field, without causal influence among the
qubits or among the fields. The initial states are assumed to be the GHZ and W
states, which are the two representative three-partite entangled states. For
each ... | [
{
"created": "Tue, 15 Dec 2015 18:22:15 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2016 08:53:20 GMT",
"version": "v2"
}
] | 2016-07-13 | [
[
"Dai",
"Yue",
""
],
[
"Shen",
"Zhejun",
""
],
[
"Shi",
"Yu",
""
]
] | We consider quantum entanglement of three accelerating qubits, each of which is locally coupled with a real scalar field, without causal influence among the qubits or among the fields. The initial states are assumed to be the GHZ and W states, which are the two representative three-partite entangled states. For each in... |
2103.13504 | Petya Nedkova | Efthimia Deligianni, Jutta Kunz, Petya Nedkova, Stoytcho Yazadjiev,
Radostina Zheleva | Quasi-periodic oscillations from the accretion disk around rotating
traversable wormholes | 23 pages, 7 figures | Phys. Rev. D 104, 024048 (2021) | 10.1103/PhysRevD.104.024048 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study the quasi-periodic oscillations from the accretion disk around
rotating traversable wormholes by means of the resonance models. We investigate
the linear stability of the circular geodesic orbits in the equatorial plane
for a general class of wormhole geometries deriving analytical expressions for
the epicyc... | [
{
"created": "Wed, 24 Mar 2021 22:21:17 GMT",
"version": "v1"
}
] | 2021-07-28 | [
[
"Deligianni",
"Efthimia",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Nedkova",
"Petya",
""
],
[
"Yazadjiev",
"Stoytcho",
""
],
[
"Zheleva",
"Radostina",
""
]
] | We study the quasi-periodic oscillations from the accretion disk around rotating traversable wormholes by means of the resonance models. We investigate the linear stability of the circular geodesic orbits in the equatorial plane for a general class of wormhole geometries deriving analytical expressions for the epicycli... |
1404.2485 | Waleed El Hanafy | M. I. Wanas, Nabil L. Youssef and W. El Hanafy | Pure Geometric Field Theory: Description of Gravity and Material
Distribution | 19 pages, RevTex LaTeX, some modifications to match the published
version | Gravitation and Cosmology, 23 (2017), 105-118 | 10.1134/S0202289317020128 | null | gr-qc hep-ph hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A field theory is constructed in the context of parameterized absolute
parallelism geometry. The theory is shown to be a pure gravity one. It is
capable of describing the gravitational field and a material distribution in
terms of the geometric structure of the geometry used (the parallelization
vector fields). Three... | [
{
"created": "Wed, 9 Apr 2014 13:41:02 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jul 2014 10:02:36 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Mar 2015 11:17:25 GMT",
"version": "v3"
},
{
"created": "Tue, 23 May 2017 15:45:48 GMT",
"version": "v4"
}
] | 2017-05-24 | [
[
"Wanas",
"M. I.",
""
],
[
"Youssef",
"Nabil L.",
""
],
[
"Hanafy",
"W. El",
""
]
] | A field theory is constructed in the context of parameterized absolute parallelism geometry. The theory is shown to be a pure gravity one. It is capable of describing the gravitational field and a material distribution in terms of the geometric structure of the geometry used (the parallelization vector fields). Three t... |
2312.06612 | Bouzenada Abdelmalek . | Faizuddin Ahmed and Abdelmalek Bouzenada | Scalar fields in Bonnor-Melvin Universe with potential: A study of
dynamics of spin-0 particles-antiparticles | null | null | 10.1088/1402-4896/ad4830 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | This research focus on the investigation of relativistic quantum dynamics of
spin0 scalar particles/fields through the utilization of the Klein-Gordon (KG)
equation within the framework of an electrovacuum space-time in the presence of
an external scalar potential. Specifically, we focus on a cylindrical symmetric
Bo... | [
{
"created": "Thu, 7 Dec 2023 08:51:56 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2024 18:28:00 GMT",
"version": "v2"
}
] | 2024-05-20 | [
[
"Ahmed",
"Faizuddin",
""
],
[
"Bouzenada",
"Abdelmalek",
""
]
] | This research focus on the investigation of relativistic quantum dynamics of spin0 scalar particles/fields through the utilization of the Klein-Gordon (KG) equation within the framework of an electrovacuum space-time in the presence of an external scalar potential. Specifically, we focus on a cylindrical symmetric Bonn... |
gr-qc/9508049 | Peter Dunsby | W. M. Lesame, G. F. R. Ellis and P. K. S. Dunsby | Irrotational dust with Div H=0 | 19 pages. Latex. Also avaliable at
http://shiva.mth.uct.ac.za/preprints/text/lesame2.tex | Phys.Rev. D53 (1996) 738-746 | 10.1103/PhysRevD.53.738 | null | gr-qc | null | For irrotational dust the shear tensor is consistently diagonalizable with
its covariant time derivative: $\sigma_{ab}=0=\dot{\sigma}_{ab},\; a\neq b$, if
and only if the divergence of the magnetic part of the Weyl tensor vanishes:
$div~H = 0$. We show here that in that case, the consistency of the Ricci
constraints ... | [
{
"created": "Wed, 23 Aug 1995 11:44:13 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lesame",
"W. M.",
""
],
[
"Ellis",
"G. F. R.",
""
],
[
"Dunsby",
"P. K. S.",
""
]
] | For irrotational dust the shear tensor is consistently diagonalizable with its covariant time derivative: $\sigma_{ab}=0=\dot{\sigma}_{ab},\; a\neq b$, if and only if the divergence of the magnetic part of the Weyl tensor vanishes: $div~H = 0$. We show here that in that case, the consistency of the Ricci constraints re... |
2401.16096 | Jing Liu | Jing Liu | Gravitational laser: the stimulated radiation of gravitational waves
from the clouds of ultralight bosons | 6 pages, 1 figure | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stimulated radiation and gravitational waves (GWs) are two of the most
important predictions made by Albert Einstein. In this work, we demonstrate
that stimulated GW radiation can occur within gravitational atoms, which
consist of Kerr black holes and the surrounding boson clouds formed through
superradiance. The pre... | [
{
"created": "Mon, 29 Jan 2024 12:11:10 GMT",
"version": "v1"
}
] | 2024-01-30 | [
[
"Liu",
"Jing",
""
]
] | Stimulated radiation and gravitational waves (GWs) are two of the most important predictions made by Albert Einstein. In this work, we demonstrate that stimulated GW radiation can occur within gravitational atoms, which consist of Kerr black holes and the surrounding boson clouds formed through superradiance. The prese... |
2103.13163 | Aaron Held | Astrid Eichhorn and Aaron Held | From a locality-principle for new physics to image features of regular
spinning black holes with disks | 25 pages (including 12 figures) + two appendices, references, and a
supplementary file | null | 10.1088/1475-7516/2021/05/073 | Imperial/TP/2021/AH/02 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current observations present unprecedented opportunities to probe the true
nature of black holes, which must harbor new physics beyond General Relativity
to provide singularity-free descriptions. To test paradigms for this new
physics, it is necessary to bridge the gap all the way from theoretical
developments of new... | [
{
"created": "Wed, 24 Mar 2021 13:08:22 GMT",
"version": "v1"
}
] | 2021-06-02 | [
[
"Eichhorn",
"Astrid",
""
],
[
"Held",
"Aaron",
""
]
] | Current observations present unprecedented opportunities to probe the true nature of black holes, which must harbor new physics beyond General Relativity to provide singularity-free descriptions. To test paradigms for this new physics, it is necessary to bridge the gap all the way from theoretical developments of new-p... |
1604.07355 | Alvaro De La Cruz-Dombriz | Alvaro de la Cruz-Dombriz (ACGC and U. of Cape Town) | Limitations of cosmography in extended theories of gravity | 8 pages, two figures, to appear in the Proceedings of Science (PoS)
for the 11th International Workshop Dark Side of the Universe (DSU) 2015,
Kyoto, Japan | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmographic approach, which only relies upon the homogeneity and
isotropy of the Universe on large scales, has become an essential tool in
dealing with an increasing number of theoretical possibilities for explaining
the late-time acceleration of the Universe, ranging from Modified Gravity
theories to Dark Energ... | [
{
"created": "Mon, 25 Apr 2016 18:29:52 GMT",
"version": "v1"
}
] | 2016-04-26 | [
[
"de la Cruz-Dombriz",
"Alvaro",
"",
"ACGC and U. of Cape Town"
]
] | The cosmographic approach, which only relies upon the homogeneity and isotropy of the Universe on large scales, has become an essential tool in dealing with an increasing number of theoretical possibilities for explaining the late-time acceleration of the Universe, ranging from Modified Gravity theories to Dark Energy ... |
gr-qc/0601122 | Kenneth Koehler | K. R. Koehler | Einstein Product Metrics in Diverse Dimensions | 6 pages, submitted to General Relativity and Gravitation | null | null | null | gr-qc | null | We use direct products of Einstein Metrics to construct new solutions to
Einstein's Equations with cosmological constant. We illustrate the technique
with three families of solutions having the geometries Kerr/de Sitter X de
Sitter, Kerr/anti-de Sitter X anti-de Sitter and Kerr X Kerr.
| [
{
"created": "Fri, 27 Jan 2006 16:30:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Koehler",
"K. R.",
""
]
] | We use direct products of Einstein Metrics to construct new solutions to Einstein's Equations with cosmological constant. We illustrate the technique with three families of solutions having the geometries Kerr/de Sitter X de Sitter, Kerr/anti-de Sitter X anti-de Sitter and Kerr X Kerr. |
1903.11544 | Sumati Surya | Sumati Surya | The causal set approach to quantum gravity | Latex, 78 pages, 22 Figures. Invited review article for Living
Reviews in Relativity. Version 2 includes an Appendix with definitions and
abbreviations. Typos corrected and some discussions made clearer | null | 10.1007/s41114-019-0023-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The causal set theory (CST) approach to quantum gravity postulates that at
the most fundamental level, spacetime is discrete, with the spacetime continuum
replaced by locally finite posets or "causal sets". The partial order on a
causal set represents a proto-causality relation while local finiteness encodes
an intri... | [
{
"created": "Wed, 27 Mar 2019 16:53:43 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Aug 2019 05:56:27 GMT",
"version": "v2"
}
] | 2019-10-09 | [
[
"Surya",
"Sumati",
""
]
] | The causal set theory (CST) approach to quantum gravity postulates that at the most fundamental level, spacetime is discrete, with the spacetime continuum replaced by locally finite posets or "causal sets". The partial order on a causal set represents a proto-causality relation while local finiteness encodes an intrins... |
gr-qc/0012097 | Vladimir M. Khatsymovsky | V. M. Khatsymovsky | On the Faddeev-Popov determinant in Regge calculus | 5 pages, LaTeX | Phys.Lett. B504 (2001) 359-361 | 10.1016/S0370-2693(01)00296-9 | null | gr-qc | null | The functional integral measure in the 4D Regge calculus normalised w.r.t.
the DeWitt supermetric on the space of metrics is considered. The Faddeev-Popov
factor in the measure is shown according to the previous author's work on the
continuous fields in Regge calculus to be generally ill-defined due to the
conical si... | [
{
"created": "Wed, 27 Dec 2000 00:06:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | The functional integral measure in the 4D Regge calculus normalised w.r.t. the DeWitt supermetric on the space of metrics is considered. The Faddeev-Popov factor in the measure is shown according to the previous author's work on the continuous fields in Regge calculus to be generally ill-defined due to the conical sing... |
0910.4594 | Alexandre Le Tiec | Alexandre Le Tiec, Luc Blanchet, Clifford M. Will | Gravitational-Wave Recoil from the Ringdown Phase of Coalescing Black
Hole Binaries | 9 pages, 5 figures; to appear in Class. Quant. Grav | Class.Quant.Grav.27:012001,2010 | 10.1088/0264-9381/27/1/012001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational recoil or "kick" of a black hole formed from the merger of
two orbiting black holes, and caused by the anisotropic emission of
gravitational radiation, is an astrophysically important phenomenon. We combine
(i) an earlier calculation, using post-Newtonian theory, of the kick velocity
accumulated up ... | [
{
"created": "Fri, 23 Oct 2009 20:52:48 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Dec 2009 13:58:14 GMT",
"version": "v2"
}
] | 2010-01-28 | [
[
"Tiec",
"Alexandre Le",
""
],
[
"Blanchet",
"Luc",
""
],
[
"Will",
"Clifford M.",
""
]
] | The gravitational recoil or "kick" of a black hole formed from the merger of two orbiting black holes, and caused by the anisotropic emission of gravitational radiation, is an astrophysically important phenomenon. We combine (i) an earlier calculation, using post-Newtonian theory, of the kick velocity accumulated up to... |
1411.2609 | Shahar Hod | Shahar Hod | Rotating black holes can have short bristles | 13 pages | Physics Letters B 739, 196 (2014) | 10.1016/j.physletb.2014.10.062 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The elegant `no short hair' theorem states that, if a spherically-symmetric
static black hole has hair, then this hair must extend beyond 3/2 the horizon
radius. In the present paper we provide evidence for the failure of this
theorem beyond the regime of spherically-symmetric static black holes. In
particular, we sh... | [
{
"created": "Mon, 10 Nov 2014 21:02:27 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Hod",
"Shahar",
""
]
] | The elegant `no short hair' theorem states that, if a spherically-symmetric static black hole has hair, then this hair must extend beyond 3/2 the horizon radius. In the present paper we provide evidence for the failure of this theorem beyond the regime of spherically-symmetric static black holes. In particular, we show... |
1503.02334 | Barry Wardell | Chris Kavanagh, Adrian C. Ottewill and Barry Wardell | Analytical high-order post-Newtonian expansions for extreme mass ratio
binaries | Updated to match published version | Phys. Rev. D 92, 084025 (2015) | 10.1103/PhysRevD.92.084025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present analytic computations of gauge invariant quantities for a point
mass in a circular orbit around a Schwarzschild black hole, giving results up
to 15.5 post-Newtonian order in this paper and up to 21.5 post-Newtonian order
in an online repository. Our calculation is based on the functional series
method of M... | [
{
"created": "Sun, 8 Mar 2015 22:16:44 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2015 15:40:37 GMT",
"version": "v2"
},
{
"created": "Wed, 5 May 2021 10:04:25 GMT",
"version": "v3"
}
] | 2021-05-06 | [
[
"Kavanagh",
"Chris",
""
],
[
"Ottewill",
"Adrian C.",
""
],
[
"Wardell",
"Barry",
""
]
] | We present analytic computations of gauge invariant quantities for a point mass in a circular orbit around a Schwarzschild black hole, giving results up to 15.5 post-Newtonian order in this paper and up to 21.5 post-Newtonian order in an online repository. Our calculation is based on the functional series method of Man... |
1708.02437 | Titus K Mathew | Jerin Mohan N D, Athira Sasidharan and Titus K Mathew | Bulk viscous matter and recent acceleration of the universe based on
causal viscous theory | 29 pages, 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Evolution of the bulk viscous matter dominated universe has been analysed
using the full causal, Israel-Stewart theory for the evolution of bulk viscous
pressure in the context of recent acceleration of the universe. The form of
bulk viscosity is taken as $\xi=\alpha\rho^{1/2}. $ We obtained analytical
solutions for ... | [
{
"created": "Tue, 8 Aug 2017 10:20:35 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Apr 2018 10:03:51 GMT",
"version": "v2"
}
] | 2018-04-23 | [
[
"D",
"Jerin Mohan N",
""
],
[
"Sasidharan",
"Athira",
""
],
[
"Mathew",
"Titus K",
""
]
] | Evolution of the bulk viscous matter dominated universe has been analysed using the full causal, Israel-Stewart theory for the evolution of bulk viscous pressure in the context of recent acceleration of the universe. The form of bulk viscosity is taken as $\xi=\alpha\rho^{1/2}. $ We obtained analytical solutions for th... |
gr-qc/0203047 | W. B. Bonnor | W.B.Bonnor | The magnetic dipole interaction in Einstein-Maxwell theory | 6 pages, LaTeX | Class.Quant.Grav. 19 (2002) 149-153 | 10.1088/0264-9381/19/1/309 | null | gr-qc | null | I derive an exact, static, axially symmetric solution of the Einstein-Maxwell
equations representing two massless magnetic dipoles, and compare it with the
corresponding solution of Einstein's equations for two massless spinning
particles (see gr-qc/0201094). I then obtain an exact stationary solution of
the Einstein... | [
{
"created": "Wed, 13 Mar 2002 14:10:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bonnor",
"W. B.",
""
]
] | I derive an exact, static, axially symmetric solution of the Einstein-Maxwell equations representing two massless magnetic dipoles, and compare it with the corresponding solution of Einstein's equations for two massless spinning particles (see gr-qc/0201094). I then obtain an exact stationary solution of the Einstein-M... |
1901.08690 | Israel Quiros | Israel Quiros | Selected topics in scalar-tensor theories and beyond | 181 pages, 5 figures, Invited review published by the International
Journal of Modern Physics D. This version matches the one published by the
Journal | Int.J.Mod.Phys.D28,No 7(2019)1930012 | 10.1142/S021827181930012X | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar fields have played an important role in the development of the
fundamental theories of physics as well as in other branches of physics such as
gravitation and cosmology. For a long time these escaped detection until 2012
year when the Higgs boson was observed for the first time. Since then
alternatives to the ... | [
{
"created": "Thu, 24 Jan 2019 23:44:10 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2019 03:34:56 GMT",
"version": "v2"
}
] | 2019-05-29 | [
[
"Quiros",
"Israel",
""
]
] | Scalar fields have played an important role in the development of the fundamental theories of physics as well as in other branches of physics such as gravitation and cosmology. For a long time these escaped detection until 2012 year when the Higgs boson was observed for the first time. Since then alternatives to the ge... |
gr-qc/9912008 | Rodolfo Mohamed Id Betan | M. A. Castagnino H. Giacomini, L. Lara | Dynamical properties of the conformally coupled flat FRW model | null | Phys.Rev. D61 (2000) 107302 | 10.1103/PhysRevD.61.107302 | null | gr-qc | null | In this paper we study the dynamical behaviour of a simple cosmological model
defined by a spatially flat Robertson-Walker geometry, conformally coupled with
a massive scalar field. We determine a Lyapunov-like function for the
non-linear evolution equations. From this function we prove that all the
stationary soluti... | [
{
"created": "Thu, 2 Dec 1999 13:42:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Giacomini",
"M. A. Castagnino H.",
""
],
[
"Lara",
"L.",
""
]
] | In this paper we study the dynamical behaviour of a simple cosmological model defined by a spatially flat Robertson-Walker geometry, conformally coupled with a massive scalar field. We determine a Lyapunov-like function for the non-linear evolution equations. From this function we prove that all the stationary solution... |
1911.07329 | Vasilis Oikonomou | Shin'ichi Nojiri, S.D. Odintsov, V.K. Oikonomou | Ghost-free non-local $F(R)$ Gravity Cosmology | null | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we shall study ghost-free non-local $F(R)$ gravity models.
Firstly we shall demonstrate how the ghost degrees of freedom may occur in the
non-local $F(R)$ gravity models, and accordingly we shall modify appropriately
the gravitational action of non-local $F(R)$ gravity models in order to
eliminate the gh... | [
{
"created": "Sun, 17 Nov 2019 20:24:05 GMT",
"version": "v1"
}
] | 2019-11-19 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this work we shall study ghost-free non-local $F(R)$ gravity models. Firstly we shall demonstrate how the ghost degrees of freedom may occur in the non-local $F(R)$ gravity models, and accordingly we shall modify appropriately the gravitational action of non-local $F(R)$ gravity models in order to eliminate the ghos... |
2004.09442 | Serguei Ossokine | Serguei Ossokine, Alessandra Buonanno, Sylvain Marsat, Roberto
Cotesta, Stanislav Babak, Tim Dietrich, Roland Haas, Ian Hinder, Harald P.
Pfeiffer, Michael P\"urrer, Charles J. Woodford, Michael Boyle, Lawrence E.
Kidder, Mark A. Scheel, and B\'ela Szil\'agyi | Multipolar Effective-One-Body Waveforms for Precessing Binary Black
Holes: Construction and Validation | 24 pages, 18 figures. Abstract abridged | Phys. Rev. D 102, 044055 (2020) | 10.1103/PhysRevD.102.044055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As gravitational-wave detectors become more sensitive, we will access a
greater variety of signals emitted by compact binary systems, shedding light on
their astrophysical origin and environment. A key physical effect that can
distinguish among formation scenarios is the misalignment of the spins with the
orbital ang... | [
{
"created": "Mon, 20 Apr 2020 16:54:30 GMT",
"version": "v1"
}
] | 2020-09-09 | [
[
"Ossokine",
"Serguei",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Marsat",
"Sylvain",
""
],
[
"Cotesta",
"Roberto",
""
],
[
"Babak",
"Stanislav",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Haas",
"Roland",
""
],... | As gravitational-wave detectors become more sensitive, we will access a greater variety of signals emitted by compact binary systems, shedding light on their astrophysical origin and environment. A key physical effect that can distinguish among formation scenarios is the misalignment of the spins with the orbital angul... |
1606.07304 | Douglas A. Singleton | Vladimir Dzhunushaliev, Vladimir Folomeev, Arislan Makhmudov, Ainur
Urazalina, Douglas Singleton, and John Scott | Compact and extended objects from self-interacting phantom fields | 17 pages revtex, 25 figures. Published version. References added and
a noted added in the arXiv only version of relevant review article | Phys.Rev. D94 (2016) 024004 | 10.1103/PhysRevD.94.024004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate localized and extended objects for gravitating,
self-interacting phantom fields. The phantom fields come from two scalar fields
with a "wrong sign" (negative) kinetic energy term in the Lagrangian. This
study covers several solutions supported by these phantom fields: phantom
balls, traver... | [
{
"created": "Thu, 23 Jun 2016 13:12:53 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Jul 2016 22:35:52 GMT",
"version": "v2"
}
] | 2016-07-12 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
],
[
"Makhmudov",
"Arislan",
""
],
[
"Urazalina",
"Ainur",
""
],
[
"Singleton",
"Douglas",
""
],
[
"Scott",
"John",
""
]
] | In this work we investigate localized and extended objects for gravitating, self-interacting phantom fields. The phantom fields come from two scalar fields with a "wrong sign" (negative) kinetic energy term in the Lagrangian. This study covers several solutions supported by these phantom fields: phantom balls, traversa... |
1705.04167 | Bushra Majeed | Bushra Majeed and Mubasher Jamil | Dynamics and center of mass energy of colliding particles around black
hole in f(R) gravity | 10 Pages, 2 Figures | International Journal of Modern Physics D, Vol. 26, No. 5 (2017)
1741017 (9 pages) | 10.1142/S0218271817410176 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the dynamics of particles in the vicinity of a static
spherically symmetric black hole in f(R) gravity. Using the Euler-Lagrange
method the dynamical equations of a neutral particle are obtained. Assuming
that the particle is initially moving in the innermost stable circular orbit,
we have calcul... | [
{
"created": "Wed, 10 May 2017 00:59:34 GMT",
"version": "v1"
}
] | 2017-05-12 | [
[
"Majeed",
"Bushra",
""
],
[
"Jamil",
"Mubasher",
""
]
] | We have investigated the dynamics of particles in the vicinity of a static spherically symmetric black hole in f(R) gravity. Using the Euler-Lagrange method the dynamical equations of a neutral particle are obtained. Assuming that the particle is initially moving in the innermost stable circular orbit, we have calculat... |
2203.11946 | Yurii Ignat'ev | Yu. G. Ignat'ev, A.A. Agathonov and D. Yu. Ignatyev | Cosmological evolution of a statistical system of degenerate
scalar-charged fermions with an asymmetric scalar doublet. I. Two-component
system of assorted charges | 14 pages, 15 figures, 29 references | Gravit. Cosmol. 27 (2021) 338 | 10.1134/S020228932104006X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the mathematical model of a statistical system with scalar
interaction of fermions formulated earlier, a cosmological model based on a
two-component statistical system of scalar charged degenerate fermions
interacting with an asymmetric scalar doublet, canonical and phantom scalar
fields, is investigated. Th... | [
{
"created": "Tue, 22 Mar 2022 16:01:03 GMT",
"version": "v1"
}
] | 2022-03-24 | [
[
"Ignat'ev",
"Yu. G.",
""
],
[
"Agathonov",
"A. A.",
""
],
[
"Ignatyev",
"D. Yu.",
""
]
] | Based on the mathematical model of a statistical system with scalar interaction of fermions formulated earlier, a cosmological model based on a two-component statistical system of scalar charged degenerate fermions interacting with an asymmetric scalar doublet, canonical and phantom scalar fields, is investigated. The ... |
gr-qc/0407002 | Brian Edgar | S. Brian Edgar | Proofs of existence of local potentials for trace-free symmetric 2-forms
using dimensionally dependent identities | 8 pages; Tex file | null | null | null | gr-qc math.DG | null | We exploit four-dimensional tensor identities to give a very simple proof of
the existence of a Lanczos potential for a Weyl tensor in four dimensions with
any signature, and to show that the potential satisfies a simple linear second
order differential equation, e.g., a wave equation in Lorentz signature.
Furthermor... | [
{
"created": "Thu, 1 Jul 2004 11:47:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Edgar",
"S. Brian",
""
]
] | We exploit four-dimensional tensor identities to give a very simple proof of the existence of a Lanczos potential for a Weyl tensor in four dimensions with any signature, and to show that the potential satisfies a simple linear second order differential equation, e.g., a wave equation in Lorentz signature. Furthermore,... |
2202.08160 | Sayani Maity | Sayani Maity and Prabir Rudra | Inflation driven by Barrow Holographic dark energy | 10 pages, 2 figures | Journal of Holography Applications in Physics, Vol: 2, Issue:1,
Page: 1-12, Year: 2022 | 10.22128/jhap.2022.464.1012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have investigated the inflation mechanism driven by the
Barrow Holographic dark energy (BHDE) in the early universe. BHDE is based on
the Barrow relation for horizon entropy, which in turn is inspired from the
shape of the COVID-19 virus. It was shown by Barrow that the quantum
gravitational effects m... | [
{
"created": "Tue, 15 Feb 2022 11:52:04 GMT",
"version": "v1"
}
] | 2022-02-17 | [
[
"Maity",
"Sayani",
""
],
[
"Rudra",
"Prabir",
""
]
] | In this work we have investigated the inflation mechanism driven by the Barrow Holographic dark energy (BHDE) in the early universe. BHDE is based on the Barrow relation for horizon entropy, which in turn is inspired from the shape of the COVID-19 virus. It was shown by Barrow that the quantum gravitational effects may... |
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