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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1111.1409 | Charalampos Markakis | Charalampos Markakis, Koji Uryu, Eric Gourgoulhon | Quasi-equilibrium models of magnetized compact objects | Talk given at the 14th Conference on Recent Developments in Gravity
(NEB XIV), Ioannina, Greece, 8-11 Jun 2010 | J. Phys.: Conf. Ser. 283 012021, 2011 | 10.1088/1742-6596/283/1/012021 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report work towards a relativistic formulation for modeling strongly
magnetized neutron stars, rotating or in a close circular orbit around another
neutron star or black hole, under the approximations of helical symmetry and
ideal MHD. The quasi-stationary evolution is governed by the first law of
thermodynamics f... | [
{
"created": "Sun, 6 Nov 2011 12:10:40 GMT",
"version": "v1"
}
] | 2011-11-08 | [
[
"Markakis",
"Charalampos",
""
],
[
"Uryu",
"Koji",
""
],
[
"Gourgoulhon",
"Eric",
""
]
] | We report work towards a relativistic formulation for modeling strongly magnetized neutron stars, rotating or in a close circular orbit around another neutron star or black hole, under the approximations of helical symmetry and ideal MHD. The quasi-stationary evolution is governed by the first law of thermodynamics for... |
gr-qc/0405030 | Finn Ravndal | Finn Ravndal | Scalar Gravitation and Extra Dimensions | Invited talk at The Gunnar Nordstrom Symposium on Theoretical
Physics, Helsinki, August 27 - 30, 2003 | null | null | null | gr-qc hep-ph | null | Gunnar Nordstrom constructed the first relativistic theory of gravitation
formulated in terms of interactions with a scalar field. It was an important
precursor to Einstein's general theory of relativity a couple of years later.
He was also the first to introduce an extra dimension to our spacetime so that
gravitatio... | [
{
"created": "Thu, 6 May 2004 13:47:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ravndal",
"Finn",
""
]
] | Gunnar Nordstrom constructed the first relativistic theory of gravitation formulated in terms of interactions with a scalar field. It was an important precursor to Einstein's general theory of relativity a couple of years later. He was also the first to introduce an extra dimension to our spacetime so that gravitation ... |
1607.08264 | Jerzy Kr\'ol | Michael Heller and Jerzy Kr\'ol | Synthetic Approach to the Singularity Problem | 17 pages, no figures | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We try to convince the reader that the categorical version of differential
geometry, called Synthetic Differential Geometry (SDG), offers valuable tools
which can be applied to work with some unsolved problems of general relativity.
We do this with respect to the space-time singularity problem. The essential
differen... | [
{
"created": "Wed, 27 Jul 2016 21:15:13 GMT",
"version": "v1"
}
] | 2016-08-02 | [
[
"Heller",
"Michael",
""
],
[
"Król",
"Jerzy",
""
]
] | We try to convince the reader that the categorical version of differential geometry, called Synthetic Differential Geometry (SDG), offers valuable tools which can be applied to work with some unsolved problems of general relativity. We do this with respect to the space-time singularity problem. The essential difference... |
2405.04174 | Phongpichit Channuie | Jureeporn Yuennan (Nakhon Si Thammarat Rajabhat U.), Phongpichit
Channuie (Walailak U.), Davood Momeni (Northern Virginia Community College) | Gravity Rainbow Effects on Higher Curvature Modification of R2 inflation | v3: 21 pages, 4 figures. references added, texts modified, results
unchanged. Version published in EPJC. arXiv admin note: text overlap with
arXiv:2404.14766 | Eur. Phys. J. C (2024) 84:766 | 10.1140/epjc/s10052-024-13155-0 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we study several extensions of the higher curvature
modification of $R^{2}$ inflation in the context of gravity's rainbow. We
modify the $(R+R^{2})$ model by adding an $f_{1}R^3$-term, an $f_{2}R^4$-term,
and an $f_{3}R^{3/2}$-term to the original model. We calculate the inflationary
observables and con... | [
{
"created": "Tue, 7 May 2024 10:19:18 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2024 06:46:50 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Aug 2024 23:03:34 GMT",
"version": "v3"
}
] | 2024-08-05 | [
[
"Yuennan",
"Jureeporn",
"",
"Nakhon Si Thammarat Rajabhat U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
],
[
"Momeni",
"Davood",
"",
"Northern Virginia Community College"
]
] | In this work, we study several extensions of the higher curvature modification of $R^{2}$ inflation in the context of gravity's rainbow. We modify the $(R+R^{2})$ model by adding an $f_{1}R^3$-term, an $f_{2}R^4$-term, and an $f_{3}R^{3/2}$-term to the original model. We calculate the inflationary observables and confr... |
2202.03228 | Peter Leith | Peter E. D. Leith, Alasdair Dorkenoo Leggat, Chris A. Hooley, Keith
Horne, David G. Dritschel | Gravitationally localized states of two neutral fermions interacting
with a Higgs field | 13 pages, 10 figures | null | 10.1103/PhysRevD.107.106020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present localized 'particle-like' states composed of a pair of neutral
fermions interacting with a scalar Higgs field and the metric of spacetime,
extending the Einstein-Dirac formalism introduced by Finster, Smoller, and Yau
[Phys. Rev. D 59, 104020 (1999)]. We demonstrate that, when the coupling
between the ferm... | [
{
"created": "Mon, 7 Feb 2022 14:33:43 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jul 2023 17:19:04 GMT",
"version": "v2"
}
] | 2023-07-27 | [
[
"Leith",
"Peter E. D.",
""
],
[
"Leggat",
"Alasdair Dorkenoo",
""
],
[
"Hooley",
"Chris A.",
""
],
[
"Horne",
"Keith",
""
],
[
"Dritschel",
"David G.",
""
]
] | We present localized 'particle-like' states composed of a pair of neutral fermions interacting with a scalar Higgs field and the metric of spacetime, extending the Einstein-Dirac formalism introduced by Finster, Smoller, and Yau [Phys. Rev. D 59, 104020 (1999)]. We demonstrate that, when the coupling between the fermio... |
1308.4953 | Yaser Tavakoli | Joao Marto, Yaser Tavakoli, Paulo Vargas Moniz | Improved dynamics and gravitational collapse of tachyon field coupled
with a barotropic fluid | Version accepted in IJMPD | Int. J. Mod. Phys. D Vol. 24, No. 4 (2015) 1550025 | 10.1142/S021827181550025X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a spherically symmetric gravitational collapse of a tachyon field
with an inverse square potential, which is coupled with a barotropic fluid. By
employing an holonomy correction imported from loop quantum cosmology, we
analyse the dynamics of the collapse within a semiclassical description. Using
a dynami... | [
{
"created": "Thu, 22 Aug 2013 18:42:59 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Dec 2013 17:38:39 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Jan 2015 00:02:08 GMT",
"version": "v3"
}
] | 2015-01-16 | [
[
"Marto",
"Joao",
""
],
[
"Tavakoli",
"Yaser",
""
],
[
"Moniz",
"Paulo Vargas",
""
]
] | We consider a spherically symmetric gravitational collapse of a tachyon field with an inverse square potential, which is coupled with a barotropic fluid. By employing an holonomy correction imported from loop quantum cosmology, we analyse the dynamics of the collapse within a semiclassical description. Using a dynamica... |
1103.5450 | Daniel M\"uller | Juliano A. de Deus and Daniel M\"uller | Bianchi $VII_A$ solutions of quadratic gravity | version accepted for publication in General Relativity and
Gravitation. arXiv admin note: substantial text overlap with arXiv:1203.6882 | null | 10.1007/s10714-012-1349-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is believed that soon after the Planck time, Einstein's general relativity
theory should be corrected to an effective quadratic theory. Numerical
solutions for the anisotropic generalization of the Friedmann "open" model $H^
3$ for this effective gravity are given. It must be emphasized that although
numeric, thes... | [
{
"created": "Mon, 28 Mar 2011 19:22:54 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2012 20:59:25 GMT",
"version": "v2"
}
] | 2012-04-11 | [
[
"de Deus",
"Juliano A.",
""
],
[
"Müller",
"Daniel",
""
]
] | It is believed that soon after the Planck time, Einstein's general relativity theory should be corrected to an effective quadratic theory. Numerical solutions for the anisotropic generalization of the Friedmann "open" model $H^ 3$ for this effective gravity are given. It must be emphasized that although numeric, these ... |
2405.15626 | Romanshu Garg | G. P. Singh, Romanshu Garg, Ashutosh Singh | A generalized $\Lambda$CDM model with parameterized Hubble parameter in
particle creation, viscous and $f(R)$ model framework | 16 pages, 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we construct a theoretical framework based on the generalized
Hubble parameter form which may arise within the particle creation, viscous and
$f(R)$ gravity theory. The Hubble parameter is scrutinized for its
compatibility with the observational data relevant to the late-time universe.
By using Bayesia... | [
{
"created": "Fri, 24 May 2024 15:14:55 GMT",
"version": "v1"
}
] | 2024-05-27 | [
[
"Singh",
"G. P.",
""
],
[
"Garg",
"Romanshu",
""
],
[
"Singh",
"Ashutosh",
""
]
] | In this study, we construct a theoretical framework based on the generalized Hubble parameter form which may arise within the particle creation, viscous and $f(R)$ gravity theory. The Hubble parameter is scrutinized for its compatibility with the observational data relevant to the late-time universe. By using Bayesian ... |
gr-qc/9904025 | John W. Barrett | John W. Barrett and Louis Crane | A Lorentzian Signature Model for Quantum General Relativity | 22 pages, latex, amsfonts, Xypic. Version 3: improved presentation.
Version 2 is a major revision with explicit formulae included for the
evaluation of relativistic spin networks and the computation of examples
which have finite values | Class.Quant.Grav. 17 (2000) 3101-3118 | 10.1088/0264-9381/17/16/302 | null | gr-qc | null | We give a relativistic spin network model for quantum gravity based on the
Lorentz group and its q-deformation, the Quantum Lorentz Algebra.
We propose a combinatorial model for the path integral given by an integral
over suitable representations of this algebra. This generalises the state sum
models for the case o... | [
{
"created": "Fri, 9 Apr 1999 18:15:00 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Aug 1999 09:00:11 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jul 2000 15:45:27 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Barrett",
"John W.",
""
],
[
"Crane",
"Louis",
""
]
] | We give a relativistic spin network model for quantum gravity based on the Lorentz group and its q-deformation, the Quantum Lorentz Algebra. We propose a combinatorial model for the path integral given by an integral over suitable representations of this algebra. This generalises the state sum models for the case of th... |
gr-qc/9606016 | T. P. Singh | T. P. Singh | Gravitational Collapse and Cosmic Censorship | Latex file, 24 pages, 5 eps figures, uses epsf.sty; based on a talk
given at the XVIIIth meeting of the Indian Association for General Relativity
and Gravitation, Institute of Mathematical Sciences, Madras, India, 15-17
February, 1996; to appear in the Conference Proceedings, Editors: G. Date and
B. R. Iyer | null | null | TIFR-TAP preprint | gr-qc astro-ph hep-th | null | This article gives an elementary overview of the end-state of gravitational
collapse according to classical general relativity. The focus of discussion is
the formation of black holes and naked singularities in various physically
reasonable models of gravitational collapse. Possible implications for the
cosmic censor... | [
{
"created": "Sun, 9 Jun 1996 12:00:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Singh",
"T. P.",
""
]
] | This article gives an elementary overview of the end-state of gravitational collapse according to classical general relativity. The focus of discussion is the formation of black holes and naked singularities in various physically reasonable models of gravitational collapse. Possible implications for the cosmic censorsh... |
1203.0952 | Brandon Carter | Brandon Carter | Classical Anthropic Everett model: indeterminacy in a preordained
multiverse | 11 pages Latex contribution to J. Cosmology 14, with extra diagram
showing age dependence of anthropic quotient. Also in Consciousness and the
Universe: Quantum Physics, Evolution, Brain and Mind, ed. R. Penrose, S.
Hameroff, S. Kak (Cosmology Science Publishers, Cambridge, Mass., 2011)
1077-1086 | null | null | null | gr-qc physics.hist-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although ultimately motivated by quantum theoretical considerations,
Everett's many-world idea remains valid, as an approximation, in the classical
limit. However to be applicable it must in any case be applied in conjunction
with an appropriate anthropic principle, whose precise formulation involves an
anthropic quo... | [
{
"created": "Mon, 5 Mar 2012 15:46:23 GMT",
"version": "v1"
}
] | 2012-03-06 | [
[
"Carter",
"Brandon",
""
]
] | Although ultimately motivated by quantum theoretical considerations, Everett's many-world idea remains valid, as an approximation, in the classical limit. However to be applicable it must in any case be applied in conjunction with an appropriate anthropic principle, whose precise formulation involves an anthropic quoti... |
gr-qc/0408013 | Victor Flambaum | V.V. Flambaum | Tunneling into black hole, escape from black hole, reflection from
horizon and pair creation | 3 pages | null | null | null | gr-qc | null | Within classical general relativity, a particle cannot reach the horizon of a
black hole during a finite time, in the reference frame of an external
observer; a particle inside cannot escape from a black hole; and the horizon
does not produce any reflection. We argue that these processes may possibly be
allowed in th... | [
{
"created": "Thu, 5 Aug 2004 06:04:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Flambaum",
"V. V.",
""
]
] | Within classical general relativity, a particle cannot reach the horizon of a black hole during a finite time, in the reference frame of an external observer; a particle inside cannot escape from a black hole; and the horizon does not produce any reflection. We argue that these processes may possibly be allowed in the ... |
0906.3264 | Leonardo Fernandez-Jambrina | L. Fern\'andez-Jambrina | Magnetic Moment Density from Lack of Smoothness of the Ernst Potential | 4 pp., sprocl.sty. Proceedings of ERE'95 | Relativistic Astrophysics and Cosmology. Eds: J. Buitrago, E.
Mediavilla, A. Oscoz. World Scientific, 204-7 (1997) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk it is shown a way for constructing magnetic surface sources for
stationary axisymmetric electrovac spacetimes possessing a non-smooth
electromagnetic Ernst potential. The magnetic moment density is related to this
lack of smoothness and its calculation involves solving a linear elliptic
differential equa... | [
{
"created": "Wed, 17 Jun 2009 18:08:03 GMT",
"version": "v1"
}
] | 2009-06-18 | [
[
"Fernández-Jambrina",
"L.",
""
]
] | In this talk it is shown a way for constructing magnetic surface sources for stationary axisymmetric electrovac spacetimes possessing a non-smooth electromagnetic Ernst potential. The magnetic moment density is related to this lack of smoothness and its calculation involves solving a linear elliptic differential equati... |
gr-qc/0411079 | L. C. Garcia de Andrade | L.C. Garcia de Andrade | Riemannian geometry of gravity waves turbulent black hole analogs | Latex file | null | null | null | gr-qc | null | The gravity water wave black (GWBH) hole analog discovered by Schutzhold and
Unruh (SU) is extended to allow for the presence of turbulent shear flow. The
Riemannian geometry of turbulent black holes (BH) analogs in water waves is
computed in the case of laminar tirbulent shear flow. The Riemann curvature is
constant... | [
{
"created": "Tue, 16 Nov 2004 01:23:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | The gravity water wave black (GWBH) hole analog discovered by Schutzhold and Unruh (SU) is extended to allow for the presence of turbulent shear flow. The Riemannian geometry of turbulent black holes (BH) analogs in water waves is computed in the case of laminar tirbulent shear flow. The Riemann curvature is constant a... |
1501.02624 | Farhad Darabi | Y. Heydarzade, F. Darabi | Induced Matter Brane Gravity and Einstein Static Universe | 8 pages. arXiv admin note: text overlap with arXiv:gr-qc/0608071 by
other authors | JCAP 04 (2015) 028 | 10.1088/1475-7516/2015/04/028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate stability of the Einstein static universe against the scalar,
vector and tensor perturbations in the context of induced matter brane gravity.
It is shown that in the framework of this model, the Einstein static universe
has a positive spatial curvature. In contrast to the classical general
relativity, ... | [
{
"created": "Mon, 12 Jan 2015 12:50:44 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2015 10:07:31 GMT",
"version": "v2"
}
] | 2015-04-22 | [
[
"Heydarzade",
"Y.",
""
],
[
"Darabi",
"F.",
""
]
] | We investigate stability of the Einstein static universe against the scalar, vector and tensor perturbations in the context of induced matter brane gravity. It is shown that in the framework of this model, the Einstein static universe has a positive spatial curvature. In contrast to the classical general relativity, it... |
2207.14522 | Chayan Chatterjee | Chayan Chatterjee, Manoj Kovalam, Linqing Wen, Damon Beveridge, Foivos
Diakogiannis, Kevin Vinsen | Rapid localization of gravitational wave sources from compact binary
coalescences using deep learning | 18 pages, 8 figures | The Astrophysical Journal, Volume 959, Number 1 (2023) | 10.3847/1538-4357/ad08b7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The mergers of neutron star-neutron star and neutron star-black hole binaries
are the most promising gravitational wave events with electromagnetic
counterparts. The rapid detection, localization and simultaneous
multi-messenger follow-up of these sources is of primary importance in the
upcoming science runs of the L... | [
{
"created": "Fri, 29 Jul 2022 07:44:53 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2023 03:55:34 GMT",
"version": "v2"
}
] | 2023-12-07 | [
[
"Chatterjee",
"Chayan",
""
],
[
"Kovalam",
"Manoj",
""
],
[
"Wen",
"Linqing",
""
],
[
"Beveridge",
"Damon",
""
],
[
"Diakogiannis",
"Foivos",
""
],
[
"Vinsen",
"Kevin",
""
]
] | The mergers of neutron star-neutron star and neutron star-black hole binaries are the most promising gravitational wave events with electromagnetic counterparts. The rapid detection, localization and simultaneous multi-messenger follow-up of these sources is of primary importance in the upcoming science runs of the LIG... |
gr-qc/9911092 | Amos Harpaz | A. Harpaz, N. Soker (University of Haifa, Oranim) | The Origin of the Radiation Reaction Force | 10 pages, 2 figures | Int.J.Theor.Phys. 39 (2000) 2867-2874 | null | null | gr-qc physics.class-ph | null | The emission of radiation from an accelerated charge is analyzed. It is found
that at zero velocity, the radiation emitted from the charge imparts no counter
momentum to the emitting charge, and no radiation reaction force is created by
the radiation. A reaction force is created by the stress force that exists in
the... | [
{
"created": "Wed, 24 Nov 1999 13:25:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Harpaz",
"A.",
"",
"University of Haifa, Oranim"
],
[
"Soker",
"N.",
"",
"University of Haifa, Oranim"
]
] | The emission of radiation from an accelerated charge is analyzed. It is found that at zero velocity, the radiation emitted from the charge imparts no counter momentum to the emitting charge, and no radiation reaction force is created by the radiation. A reaction force is created by the stress force that exists in the c... |
1912.06655 | Norma G. Sanchez | Norma G. Sanchez (CNRS, LERMA PSL Univ Observatoire de Paris, Sorbonne
Univ) | New Quantum Phase of the Universe before Inflation and its Cosmological
and Dark Energy Implications | 47 pages, 1 figure | International Journal of Modern Physics A 34, No. 27, 1950155
(2019) | 10.1142/S0217751X19501550 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The physical history of the Universe is completed by including the quantum
planckian and trans-planckian phase before Inflation in the Standard Model of
the Universe in agreement with observations. A new quantum precursor phase
appears beyond the Planck scale. We extend de Sitter universe to the quantum
domain: class... | [
{
"created": "Fri, 13 Dec 2019 18:21:26 GMT",
"version": "v1"
}
] | 2019-12-23 | [
[
"Sanchez",
"Norma G.",
"",
"CNRS, LERMA PSL Univ Observatoire de Paris, Sorbonne\n Univ"
]
] | The physical history of the Universe is completed by including the quantum planckian and trans-planckian phase before Inflation in the Standard Model of the Universe in agreement with observations. A new quantum precursor phase appears beyond the Planck scale. We extend de Sitter universe to the quantum domain: classic... |
gr-qc/9907093 | Ali Shojai | Fatimah Shojai | On the Perturbative Solutions of Bohmian Quantum Gravity | 14 Pages, RevTeX. To appear in Phys. Rev. D | Phys.Rev. D60 (1999) 124001 | 10.1103/PhysRevD.60.124001 | null | gr-qc | null | In this paper we have solved the Bohmian equations of quantum gravity,
perturbatively. Solutions up to second order are derived explicitly, but in
principle the method can be used in any order. Some consequences of the
solution are disscused.
| [
{
"created": "Wed, 28 Jul 1999 08:20:45 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jul 1999 09:25:49 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Shojai",
"Fatimah",
""
]
] | In this paper we have solved the Bohmian equations of quantum gravity, perturbatively. Solutions up to second order are derived explicitly, but in principle the method can be used in any order. Some consequences of the solution are disscused. |
gr-qc/0202102 | Emilio Elizalde | Emilio Elizalde, Sergi R. Hildebrandt | The family of regular interiors for non-rotating black holes with $T^0_0
= T^1_1$ | 31 pages, 1 figure, version to appear in Physical Review D | Phys.Rev. D65 (2002) 124024 | 10.1103/PhysRevD.65.124024 | null | gr-qc astro-ph hep-th math-ph math.MP | null | We find the general solution for the spacetimes describing the interior of
static black holes with an equation of state of the type $ T^0_0 = T^1_1 $ ($T$
being the stress-energy tensor). This form is the one expected from taking into
account different quantum effects associated with strong gravitational fields.
We r... | [
{
"created": "Thu, 28 Feb 2002 17:43:21 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2002 14:00:14 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Elizalde",
"Emilio",
""
],
[
"Hildebrandt",
"Sergi R.",
""
]
] | We find the general solution for the spacetimes describing the interior of static black holes with an equation of state of the type $ T^0_0 = T^1_1 $ ($T$ being the stress-energy tensor). This form is the one expected from taking into account different quantum effects associated with strong gravitational fields. We rec... |
gr-qc/9806039 | null | Andrzej Krasi\'nski (N. Copernicus Astronomical Center and College of
Science, Polish Academy of Sciences, Warszawa, Poland) | Physics and cosmology in an inhomogeneous Universe | 13 pages, LaTeX, Contribution to the proceedings of the 49th Yamada
conference on black holes and high-energy astrophysics. To be published by
Universal Academy Press, Tokyo; email: akr@camk.edu.pl | Conf.Proc.C98-04-07:133,1998 | null | null | gr-qc | null | Examples are presented of applications of the Lema\^{i}tre - Tolman model to
problems of astrophysics and gravitation theory. They are: 1. Inferring the
spatial distribution of matter by interpretation of observations; 2.
Interaction of inhomogeneities in matter distribution with the CMB radiation;
3. Evolution of vo... | [
{
"created": "Tue, 9 Jun 1998 04:21:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Krasiński",
"Andrzej",
"",
"N. Copernicus Astronomical Center and College of\n Science, Polish Academy of Sciences, Warszawa, Poland"
]
] | Examples are presented of applications of the Lema\^{i}tre - Tolman model to problems of astrophysics and gravitation theory. They are: 1. Inferring the spatial distribution of matter by interpretation of observations; 2. Interaction of inhomogeneities in matter distribution with the CMB radiation; 3. Evolution of void... |
2305.00226 | Cameron Bunney | Vitor S. Barroso, Cameron R. D. Bunney, Silke Weinfurtner | Non-linear effective field theory simulators in two-fluid interfaces | 17 pages, contribution to the proceedings of the "Avenues of Quantum
Field Theory in Curved Space-time" conference, Genova, September 2022 | null | 10.1088/1742-6596/2531/1/012003 | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analogue gravity offers an approach for testing the universality and
robustness of quantum field theories in curved spacetimes and validating them
using down-to-earth, laboratory-based experiments. Fluid interfaces are a
promising framework for creating these gravity simulators and have successfully
replicated phenom... | [
{
"created": "Sat, 29 Apr 2023 10:33:20 GMT",
"version": "v1"
}
] | 2023-06-27 | [
[
"Barroso",
"Vitor S.",
""
],
[
"Bunney",
"Cameron R. D.",
""
],
[
"Weinfurtner",
"Silke",
""
]
] | Analogue gravity offers an approach for testing the universality and robustness of quantum field theories in curved spacetimes and validating them using down-to-earth, laboratory-based experiments. Fluid interfaces are a promising framework for creating these gravity simulators and have successfully replicated phenomen... |
1603.08658 | T. Padmanabhan | T. Padmanabhan | The Atoms Of Space, Gravity and the Cosmological Constant | Invited Review; 32 pages; 3 figures | Int. Jour. Mod. Phys., D 25, 1630020 (2016) | 10.1142/S0218271816300202 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I describe an approach which connects classical gravity with the quantum
microstructure of spacetime. The field equations arise from maximizing the
density of states of matter plus geometry. The former is identified using the
thermodynamics of null surfaces while the latter arises due to the existence of
a zero-point... | [
{
"created": "Tue, 29 Mar 2016 07:03:13 GMT",
"version": "v1"
}
] | 2017-08-25 | [
[
"Padmanabhan",
"T.",
""
]
] | I describe an approach which connects classical gravity with the quantum microstructure of spacetime. The field equations arise from maximizing the density of states of matter plus geometry. The former is identified using the thermodynamics of null surfaces while the latter arises due to the existence of a zero-point l... |
gr-qc/0608007 | Sergey Vyatchanin | V. B. Braginsky, A. Gurkovsky, S. E. Strigin, S. P. Vyatchanin | Analysis of Parametric Oscillatory Instability in Signal Recycled LIGO
Interferometer | 10 pages, 4 figures | Phys.Lett.A362:91-99,2007 | 10.1016/j.physleta.2006.09.096 | null | gr-qc | null | We present the analysis of undesirable effect of parametric oscillatory
instability in signal recycled LIGO interferometer. The basis for this effect
is the excitation of the additional (Stokes) optical mode, with frequency
$\omega_1$, and the mirror elastic mode, with frequency $\omega_m$, when
optical energy stored... | [
{
"created": "Tue, 1 Aug 2006 11:11:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Braginsky",
"V. B.",
""
],
[
"Gurkovsky",
"A.",
""
],
[
"Strigin",
"S. E.",
""
],
[
"Vyatchanin",
"S. P.",
""
]
] | We present the analysis of undesirable effect of parametric oscillatory instability in signal recycled LIGO interferometer. The basis for this effect is the excitation of the additional (Stokes) optical mode, with frequency $\omega_1$, and the mirror elastic mode, with frequency $\omega_m$, when optical energy stored i... |
1903.04627 | Charles Robson | Charles W. Robson, Leone Di Mauro Villari and Fabio Biancalana | The Hawking Temperature of Anti-de Sitter Black Holes: Topology and
Phase Transitions | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we determine how the description of a four-dimensional
Schwarzschild-anti de Sitter black hole affects the topological calculation of
its Hawking temperature. It is shown that a two-dimensional approach is
required due to the presence of the Hawking-Page phase transition which
destabilises the spacetime'... | [
{
"created": "Mon, 11 Mar 2019 21:59:47 GMT",
"version": "v1"
}
] | 2019-03-13 | [
[
"Robson",
"Charles W.",
""
],
[
"Villari",
"Leone Di Mauro",
""
],
[
"Biancalana",
"Fabio",
""
]
] | In this work we determine how the description of a four-dimensional Schwarzschild-anti de Sitter black hole affects the topological calculation of its Hawking temperature. It is shown that a two-dimensional approach is required due to the presence of the Hawking-Page phase transition which destabilises the spacetime's ... |
gr-qc/9508004 | David Craig | David A. Craig (University of Alberta) | Observation of the Final Boundary Condition: Extragalactic Background
Radiation and the Time symmetry of the Universe | latex 2.09, 30 pages, 1 figure. Figure added, errors corrected.
Slight revision of published version | AnnalsPhys.251:384-425,1996 | 10.1006/aphy.1996.0119 | null | gr-qc astro-ph | null | This paper examines an observable consequence for the diffuse extragalactic
background radiation (EGBR) of the hypothesis that if closed, our universe
possesses time symmetric boundary conditions. For simplicity, attention is
focused on optical wavelengths. The universe is modeled as closed Friedmann-
Roberston-Walke... | [
{
"created": "Thu, 3 Aug 1995 02:36:32 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Feb 1997 01:22:42 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Craig",
"David A.",
"",
"University of Alberta"
]
] | This paper examines an observable consequence for the diffuse extragalactic background radiation (EGBR) of the hypothesis that if closed, our universe possesses time symmetric boundary conditions. For simplicity, attention is focused on optical wavelengths. The universe is modeled as closed Friedmann- Roberston-Walker.... |
gr-qc/0207050 | J. Ponce de Leon | J. Ponce de Leon and Norman Cruz | Hydrostatic Equilibrium of a Perfect Fluid Sphere with Exterior
Higher-Dimensional Schwarzschild Spacetime | null | Gen.Rel.Grav. 32 (2000) 1207-1216 | 10.1023/A:1001982402392 | null | gr-qc | null | We discuss the question of how the number of dimensions of space and time can
influence the equilibrium configurations of stars. We find that dimensionality
does increase the effect of mass but not the contribution of the pressure,
which is the same in any dimension. In the presence of a (positive)
cosmological const... | [
{
"created": "Fri, 12 Jul 2002 09:14:05 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"de Leon",
"J. Ponce",
""
],
[
"Cruz",
"Norman",
""
]
] | We discuss the question of how the number of dimensions of space and time can influence the equilibrium configurations of stars. We find that dimensionality does increase the effect of mass but not the contribution of the pressure, which is the same in any dimension. In the presence of a (positive) cosmological constan... |
2310.14920 | Ruodi Yan | Ruodi Yan, Yun Kau Lau | Resonant Scattering of Gravitational Waves With Electromagnetic Waves | 12 pages, 7 figures | Ruodi Y, Yun K L. Resonant Scattering of Gravitational Waves with
Electromagnetic Waves[J]. Chinese Physics Letters, 2023, 40(10): 100401 | 10.1088/0256-307X/40/10/100401 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | A certain class of exact solutions of Einstein Maxwell spacetime in general
relativity is discussed which demonstrates at the level of theory that, when
certain parametric resonance condition is met, the interaction of
electromagnetic field with a gravitational wave will display certain Liapounov
instability and lead... | [
{
"created": "Mon, 23 Oct 2023 13:24:40 GMT",
"version": "v1"
}
] | 2023-10-24 | [
[
"Yan",
"Ruodi",
""
],
[
"Lau",
"Yun Kau",
""
]
] | A certain class of exact solutions of Einstein Maxwell spacetime in general relativity is discussed which demonstrates at the level of theory that, when certain parametric resonance condition is met, the interaction of electromagnetic field with a gravitational wave will display certain Liapounov instability and lead t... |
gr-qc/0701064 | Davide Batic | D. Batic, H. Schmid | Heun equation, Teukolsky equation, and type-D metrics | 27 pages, corrected typo in eq. (1) | J.Math.Phys.48:042502,2007 | 10.1063/1.2720277 | null | gr-qc | null | Starting with the whole class of type-D vacuum backgrounds with cosmological
constant we show that the separated Teukolsky equation for zero rest-mass
fields with spin $s=\pm 2$ (gravitational waves), $s=\pm 1$ (electromagnetic
waves) and $s=\pm 1/2$ (neutrinos) is an Heun equation in disguise.
| [
{
"created": "Thu, 11 Jan 2007 16:54:06 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2007 14:17:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Batic",
"D.",
""
],
[
"Schmid",
"H.",
""
]
] | Starting with the whole class of type-D vacuum backgrounds with cosmological constant we show that the separated Teukolsky equation for zero rest-mass fields with spin $s=\pm 2$ (gravitational waves), $s=\pm 1$ (electromagnetic waves) and $s=\pm 1/2$ (neutrinos) is an Heun equation in disguise. |
gr-qc/0404088 | Hendryk Pfeiffer | Hendryk Pfeiffer | Quantum general relativity and the classification of smooth manifolds | 41 pages, LaTeX2e with combined eps/PicTeX figures; v2: inaccuracies
fixed | null | null | DAMTP 2004-32 | gr-qc hep-th | null | The gauge symmetry of classical general relativity under space-time
diffeomorphisms implies that any path integral quantization which can be
interpreted as a sum over space-time geometries, gives rise to a formal
invariant of smooth manifolds. This is an opportunity to review results on the
classification of smooth, ... | [
{
"created": "Wed, 21 Apr 2004 10:21:38 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2004 13:26:00 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Pfeiffer",
"Hendryk",
""
]
] | The gauge symmetry of classical general relativity under space-time diffeomorphisms implies that any path integral quantization which can be interpreted as a sum over space-time geometries, gives rise to a formal invariant of smooth manifolds. This is an opportunity to review results on the classification of smooth, pi... |
gr-qc/9704045 | null | M. Gasperini | Tensor perturbations in high-curvature string backgrounds | 9 pages, REVTEX, three figures included using EPSFIG. An updated
collection of papers on the pre-big bang scenario in string cosmology is a
available at http://www.to.infn.it/teorici/gasperini | Phys.Rev. D56 (1997) 4815-4823 | 10.1103/PhysRevD.56.4815 | DFTT-23/97 | gr-qc hep-ph hep-th | null | We derive a generalized equation for the evolution of tensor perturbations in
a cosmological background, taking into account higher-curvature contributions
and a tree-level coupling to the dilaton in the string frame. The equation is
obtained by perturbing the gravi-dilaton string effective action, expanded up
to fir... | [
{
"created": "Tue, 15 Apr 1997 12:45:05 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Gasperini",
"M.",
""
]
] | We derive a generalized equation for the evolution of tensor perturbations in a cosmological background, taking into account higher-curvature contributions and a tree-level coupling to the dilaton in the string frame. The equation is obtained by perturbing the gravi-dilaton string effective action, expanded up to first... |
2208.00106 | Charlie Hoy | Charlie Hoy | Accelerating Multi-Model Bayesian Inference, Model Selection and
Systematic Studies for Gravitational Wave Astronomy | 14 pages, 5 figures | null | 10.1103/PhysRevD.106.083003 | LIGO-P2200228 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational wave models are used to infer the properties of black holes in
merging binaries from the observed gravitational wave signals through Bayesian
inference. Although we have access to a large collection of signal models that
are sufficiently accurate to infer the properties of black holes, for some
signals,... | [
{
"created": "Fri, 29 Jul 2022 23:50:45 GMT",
"version": "v1"
}
] | 2022-10-19 | [
[
"Hoy",
"Charlie",
""
]
] | Gravitational wave models are used to infer the properties of black holes in merging binaries from the observed gravitational wave signals through Bayesian inference. Although we have access to a large collection of signal models that are sufficiently accurate to infer the properties of black holes, for some signals, s... |
gr-qc/0209113 | Andrew N. S. Farley | Andrew N. S. J. Farley | Squeezed States in Black-Hole Evaporation by Analytic Continuation | 25 pages, 1 figure | null | null | DAMTP-2002-122 | gr-qc | null | We compute the semi-classical quantum amplitude to go from an initial
spherically symmetric bosonic matter and gravitational field configuration to a
final radiation configuration, corresponding to the relic Hawking radiation
from a non-rotating, chargeless black hole which evaporates completely. This is
obtained via... | [
{
"created": "Mon, 30 Sep 2002 09:47:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Farley",
"Andrew N. S. J.",
""
]
] | We compute the semi-classical quantum amplitude to go from an initial spherically symmetric bosonic matter and gravitational field configuration to a final radiation configuration, corresponding to the relic Hawking radiation from a non-rotating, chargeless black hole which evaporates completely. This is obtained via t... |
1611.06183 | Daniel Vanzella | Rodrigo Andrade e Silva, George E. A. Matsas, and Daniel A. T.
Vanzella | Rescuing the concept of swimming in curved spacetime | 6 pages. To appear in Phys. Rev. D as a Rapid Communication | Phys. Rev. D 94, 121502(R) (2016) | 10.1103/PhysRevD.94.121502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been argued that an extended, quasi-rigid body evolving freely in
curved spacetime can deviate from its natural trajectory by simply performing
cyclic deformations. More interestingly, in the limit of rapid cycles, the
amount of deviation, per cycle, would depend on the sequence of deformations
but not on how ... | [
{
"created": "Fri, 18 Nov 2016 18:03:19 GMT",
"version": "v1"
}
] | 2017-03-28 | [
[
"Silva",
"Rodrigo Andrade e",
""
],
[
"Matsas",
"George E. A.",
""
],
[
"Vanzella",
"Daniel A. T.",
""
]
] | It has been argued that an extended, quasi-rigid body evolving freely in curved spacetime can deviate from its natural trajectory by simply performing cyclic deformations. More interestingly, in the limit of rapid cycles, the amount of deviation, per cycle, would depend on the sequence of deformations but not on how fa... |
gr-qc/0111033 | Bernard Leong | Bernard Leong, Peter Dunsby, Anthony Challinor and Anthony Lasenby | (1+3) Covariant Dynamics of Scalar Perturbations in Braneworlds | 22 pages replaced with additional references and minor corrections in
Revtex4, and accepted for publication in Phys. Rev. D | Phys.Rev. D65 (2002) 104012 | 10.1103/PhysRevD.65.104012 | null | gr-qc astro-ph hep-th | null | We discuss the dynamics of linear, scalar perturbations in an almost
Friedmann-Robertson-Walker braneworld cosmology of Randall-Sundrum type II
using the 1+3 covariant approach. We derive a complete set of frame-independent
equations for the total matter variables, and a partial set of equations for
the non-local var... | [
{
"created": "Mon, 12 Nov 2001 16:33:57 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2002 12:06:34 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Leong",
"Bernard",
""
],
[
"Dunsby",
"Peter",
""
],
[
"Challinor",
"Anthony",
""
],
[
"Lasenby",
"Anthony",
""
]
] | We discuss the dynamics of linear, scalar perturbations in an almost Friedmann-Robertson-Walker braneworld cosmology of Randall-Sundrum type II using the 1+3 covariant approach. We derive a complete set of frame-independent equations for the total matter variables, and a partial set of equations for the non-local varia... |
0903.2026 | Alexander Stroeer | Alexander Stroeer, Jordan Camp | Ninja data analysis with a detection pipeline based on the Hilbert-Huang
Transform | Accepted for publication in CQG, special issue NRDA proceedings 2008 | Class.Quant.Grav.26:114012,2009 | 10.1088/0264-9381/26/11/114012 | null | gr-qc astro-ph.IM physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Ninja data analysis challenge allowed the study of the sensitivity of
data analysis pipelines to binary black hole numerical relativity waveforms in
simulated Gaussian noise at the design level of the LIGO observatory and the
VIRGO observatory. We analyzed NINJA data with a pipeline based on the Hilbert
Huang Tra... | [
{
"created": "Wed, 11 Mar 2009 18:25:28 GMT",
"version": "v1"
}
] | 2009-06-10 | [
[
"Stroeer",
"Alexander",
""
],
[
"Camp",
"Jordan",
""
]
] | The Ninja data analysis challenge allowed the study of the sensitivity of data analysis pipelines to binary black hole numerical relativity waveforms in simulated Gaussian noise at the design level of the LIGO observatory and the VIRGO observatory. We analyzed NINJA data with a pipeline based on the Hilbert Huang Trans... |
2405.11229 | Andrej Arbuzov | A.B. Arbuzov, A.A. Nikitenko | On the choice of variable for quantization of conformal GR | 14 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The possibility of using spin connection components as basic quantization
variables of a conformal version of General Relativity is studied. The
considered model contains gravitational degrees of freedom and a scalar dilaton
field. The standard tetrad formalism is applied. Properties of spin connections
in this model... | [
{
"created": "Sat, 18 May 2024 08:48:21 GMT",
"version": "v1"
}
] | 2024-05-21 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Nikitenko",
"A. A.",
""
]
] | The possibility of using spin connection components as basic quantization variables of a conformal version of General Relativity is studied. The considered model contains gravitational degrees of freedom and a scalar dilaton field. The standard tetrad formalism is applied. Properties of spin connections in this model a... |
1212.0953 | Andreas Albrecht | Andreas Albrecht and Daniel Phillips | Origin of probabilities and their application to the multiverse | 7 pages including one table. V3: Final version accepted for
publication in PRD. Small changes throughout to improve clarity. Section V is
expanded and improved. No change to the conclusions or technical points | Phys. Rev. D 90, 123514 (2014) | 10.1103/PhysRevD.90.123514 | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue using simple models that all successful practical uses of
probabilities originate in quantum fluctuations in the microscopic physical
world around us, often propagated to macroscopic scales. Thus we claim there is
no physically verified fully classical theory of probability. We comment on the
general implica... | [
{
"created": "Wed, 5 Dec 2012 07:45:28 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Feb 2014 16:45:39 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Nov 2014 00:33:04 GMT",
"version": "v3"
}
] | 2014-12-17 | [
[
"Albrecht",
"Andreas",
""
],
[
"Phillips",
"Daniel",
""
]
] | We argue using simple models that all successful practical uses of probabilities originate in quantum fluctuations in the microscopic physical world around us, often propagated to macroscopic scales. Thus we claim there is no physically verified fully classical theory of probability. We comment on the general implicati... |
2204.07031 | Valeriy Obukhov | V.V. Obukhov | Maxwell's equations in homogeneous spaces for admissible electromagnetic
fields | 15 p.p | Universe 2022, 8, 245 | 10.3390/universe8040245 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Maxwell's vacuum equations are integrated for admissible electromagnetic
fields in homogeneous spaces. Admissible electromagnetic fields are those for
which the space group generates an algebra of symmetry operators ( integrals of
motion ) that is isomorphic to the algebra of group operators. Two frames
associated wi... | [
{
"created": "Wed, 13 Apr 2022 08:07:50 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2022 15:05:29 GMT",
"version": "v2"
}
] | 2022-04-27 | [
[
"Obukhov",
"V. V.",
""
]
] | Maxwell's vacuum equations are integrated for admissible electromagnetic fields in homogeneous spaces. Admissible electromagnetic fields are those for which the space group generates an algebra of symmetry operators ( integrals of motion ) that is isomorphic to the algebra of group operators. Two frames associated with... |
gr-qc/0309106 | Scott Funkhouser | Scott Funkhouser | The Planck Length Scale and Einstein Mass-Energy Obtained from the
Sciama-Mach Large Number Relationship | 4 pages | null | null | null | gr-qc | null | If a physical significance should be attributed to the cosmological large
number relationship obtained from Sciama's formulation of Mach's Principle,
then a number of interesting physical conclusions may be drawn. The Planck
length is naturally obtained as the amplitude of waves in a medium whose
properties are impli... | [
{
"created": "Mon, 22 Sep 2003 18:22:23 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2003 19:29:07 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Funkhouser",
"Scott",
""
]
] | If a physical significance should be attributed to the cosmological large number relationship obtained from Sciama's formulation of Mach's Principle, then a number of interesting physical conclusions may be drawn. The Planck length is naturally obtained as the amplitude of waves in a medium whose properties are implied... |
gr-qc/0701142 | Martin Bojowald | Martin Bojowald | Quantum gravity and cosmological observations | 8 pages, plenary talk at the VIth Latin American Symposium on High
Energy Physics (Puerto Vallarta, Mexico, Nov. 2006) | AIPConf.Proc.917:130-137,2007 | 10.1063/1.2751949 | null | gr-qc astro-ph hep-th | null | Quantum gravity places entirely new challenges on the formulation of a
consistent theory as well as on an extraction of potentially observable
effects. Quantum corrections due to the gravitational field are commonly
expected to be tiny because of the smallness of the Planck length. However, a
consistent formulation n... | [
{
"created": "Fri, 26 Jan 2007 19:27:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bojowald",
"Martin",
""
]
] | Quantum gravity places entirely new challenges on the formulation of a consistent theory as well as on an extraction of potentially observable effects. Quantum corrections due to the gravitational field are commonly expected to be tiny because of the smallness of the Planck length. However, a consistent formulation now... |
gr-qc/0112019 | Edward N. Glass | J.P. Krisch and E.N. Glass (Department of Physics, University of
Michigan, Ann Arbor, Michgan) | Adding Twist to Anisotropic Fluids | to appear in J. Math. Phys | J.Math.Phys. 43 (2002) 1509-1518 | 10.1063/1.1448683 | MCTP-01-62 | gr-qc | null | We present a solution generating technique for anisotropic fluids which
preserves specific Killing symmetries. Anisotropic matter distributions that
can be used with the one parameter Ehlers-Geroch transform are discussed.
Example spacetimes that support the appropriate anisotropic stress-energy are
found and the tra... | [
{
"created": "Tue, 11 Dec 2001 04:21:03 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Krisch",
"J. P.",
"",
"Department of Physics, University of\n Michigan, Ann Arbor, Michgan"
],
[
"Glass",
"E. N.",
"",
"Department of Physics, University of\n Michigan, Ann Arbor, Michgan"
]
] | We present a solution generating technique for anisotropic fluids which preserves specific Killing symmetries. Anisotropic matter distributions that can be used with the one parameter Ehlers-Geroch transform are discussed. Example spacetimes that support the appropriate anisotropic stress-energy are found and the trans... |
2108.01422 | Th. M. Nieuwenhuizen | Theo M. Nieuwenhuizen | The interior of hairy black holes in standard model physics | 6 pages revtex | null | null | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A large class of stationary, non-rotating black hole metrics is proposed, in
which the interior is regular with a core consisting of a condensate of Higgs
and $Z$ bosons generated from the nuclear binding energy of the initial H
atoms. Gravitational collapse is prevented by negative pressures from the Higgs
condensat... | [
{
"created": "Tue, 3 Aug 2021 11:43:51 GMT",
"version": "v1"
}
] | 2021-08-04 | [
[
"Nieuwenhuizen",
"Theo M.",
""
]
] | A large class of stationary, non-rotating black hole metrics is proposed, in which the interior is regular with a core consisting of a condensate of Higgs and $Z$ bosons generated from the nuclear binding energy of the initial H atoms. Gravitational collapse is prevented by negative pressures from the Higgs condensate ... |
2006.04715 | Tao Zhu | Sen Yang, Cheng Liu, Tao Zhu, Li Zhao, Qiang Wu, Ke Yang, and Mubasher
Jamil | Spherical Accretion Flow onto General Parameterized Spherically
Symmetric Black Hole Spacetimes | 15 pages, 9 figures; v2: version to be published in Chinese Physics C | Chinese Physics C Vol. 45, No. 1 (2021) 015102 | 10.1088/1674-1137/abc066 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transonic phenomenon of black hole accretion and the existence of the
photon sphere are the characteristics of strong gravitational fields near a
black hole horizon. In this work, we study spherical accretion flow onto a
general parametrized spherically symmetric black hole spacetimes. For this
purpose, we analyz... | [
{
"created": "Mon, 8 Jun 2020 16:12:36 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2020 16:13:41 GMT",
"version": "v2"
}
] | 2021-01-01 | [
[
"Yang",
"Sen",
""
],
[
"Liu",
"Cheng",
""
],
[
"Zhu",
"Tao",
""
],
[
"Zhao",
"Li",
""
],
[
"Wu",
"Qiang",
""
],
[
"Yang",
"Ke",
""
],
[
"Jamil",
"Mubasher",
""
]
] | The transonic phenomenon of black hole accretion and the existence of the photon sphere are the characteristics of strong gravitational fields near a black hole horizon. In this work, we study spherical accretion flow onto a general parametrized spherically symmetric black hole spacetimes. For this purpose, we analyze ... |
1506.00407 | Urs Wiedemann A | Stefan Floerchinger, Nikolaos Tetradis and Urs Achim Wiedemann | Backreaction effects on the matter side of Einstein's field equations | 4 pages, to be published in the Moriond Proceedings 2015 | null | null | CERN-PH-TH-2015-129 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, we have derived a novel and compact expression for how
perturbations in the matter fields of the cosmological fluid can lead to
deviations from the standard Friedmann equations. Remarkably, the dissipative
damping of velocity perturbations by bulk and shear viscosity in the dark
sector can modify the expans... | [
{
"created": "Mon, 1 Jun 2015 09:39:33 GMT",
"version": "v1"
}
] | 2015-06-02 | [
[
"Floerchinger",
"Stefan",
""
],
[
"Tetradis",
"Nikolaos",
""
],
[
"Wiedemann",
"Urs Achim",
""
]
] | Recently, we have derived a novel and compact expression for how perturbations in the matter fields of the cosmological fluid can lead to deviations from the standard Friedmann equations. Remarkably, the dissipative damping of velocity perturbations by bulk and shear viscosity in the dark sector can modify the expansio... |
1509.08769 | Kazem Rezazadeh | K. Rezazadeh, A. Abdolmaleki, K. Karami | Power-law and intermediate inflationary models in f(T)-gravity | 30 pages, 3 figures | JHEP 01 (2016) 131 | 10.1007/JHEP01(2016)131 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study inflation in the framework of $f(T)$-gravity in the presence of a
canonical scalar field. After reviewing the basic equations governing the
background cosmology in $f(T)$-gravity, we turn to study the cosmological
perturbations and obtain the evolutionary equations for the scalar and tensor
perturbations. So... | [
{
"created": "Sat, 26 Sep 2015 18:36:58 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jan 2016 20:40:58 GMT",
"version": "v2"
}
] | 2016-02-02 | [
[
"Rezazadeh",
"K.",
""
],
[
"Abdolmaleki",
"A.",
""
],
[
"Karami",
"K.",
""
]
] | We study inflation in the framework of $f(T)$-gravity in the presence of a canonical scalar field. After reviewing the basic equations governing the background cosmology in $f(T)$-gravity, we turn to study the cosmological perturbations and obtain the evolutionary equations for the scalar and tensor perturbations. Solv... |
1404.5296 | S. Davood Sadatian | S. Davood Sadatian | Is Time Inhomogeneous ? | 6 pages, Accepted for Publication in ILCPA | ILCPA 13(2) (2014) 155-159 | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we discuss probability of inhomogeneous time in high or low
energy scale of physics. Consequently, the possibility was investigated of
using theories such as varying speed of light (VSL) and fractal mathematics to
build a framework within which answers can be found to some of standard
cosmological pr... | [
{
"created": "Sun, 20 Apr 2014 04:46:03 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Apr 2014 07:18:22 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Apr 2014 20:00:56 GMT",
"version": "v3"
},
{
"created": "Thu, 8 May 2014 09:51:42 GMT",
"version": "v4"
}
] | 2014-05-09 | [
[
"Sadatian",
"S. Davood",
""
]
] | In this article, we discuss probability of inhomogeneous time in high or low energy scale of physics. Consequently, the possibility was investigated of using theories such as varying speed of light (VSL) and fractal mathematics to build a framework within which answers can be found to some of standard cosmological prob... |
1006.4601 | Jan Metzger | Lars Andersson, Michael Eichmair, Jan Metzger | Jang's equation and its applications to marginally trapped surfaces | 30 pages. To appear in the Proceedings of the Complex Analysis &
Dynamical Systems IV Conference (Nahariya, Israel, May 2009) | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we survey some recent advances in the analysis of marginally
outer trapped surfaces (MOTS). We begin with a systematic review of results by
Schoen and Yau on Jang's equation and its relationship with MOTS. We then
explain recent work on the existence, regularity, and properties of MOTS and
discuss the c... | [
{
"created": "Wed, 23 Jun 2010 17:50:01 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Nov 2010 19:41:39 GMT",
"version": "v2"
}
] | 2010-11-22 | [
[
"Andersson",
"Lars",
""
],
[
"Eichmair",
"Michael",
""
],
[
"Metzger",
"Jan",
""
]
] | In this paper we survey some recent advances in the analysis of marginally outer trapped surfaces (MOTS). We begin with a systematic review of results by Schoen and Yau on Jang's equation and its relationship with MOTS. We then explain recent work on the existence, regularity, and properties of MOTS and discuss the con... |
gr-qc/0612057 | Idan Shilon | Eduardo Guendelman and Idan Shilon | Gravitational Trapping Near Domain Walls and Stable Solitons | 8 pages, 1 figure, problem is reanalyzed using a continuous
coordinate system | Phys.Rev.D76:025021,2007 | 10.1103/PhysRevD.76.025021 | null | gr-qc | null | In this work, the behavior of test particles near a domain wall of a stable
false vacuum bubble is studied. It is shown that matter is naturally trapped in
the vicinity of a static domain wall, and also, that there is a discontinuity
in the test particle's velocity when crossing the domain wall. The latter is
unexpec... | [
{
"created": "Sun, 10 Dec 2006 20:33:13 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2007 17:53:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Guendelman",
"Eduardo",
""
],
[
"Shilon",
"Idan",
""
]
] | In this work, the behavior of test particles near a domain wall of a stable false vacuum bubble is studied. It is shown that matter is naturally trapped in the vicinity of a static domain wall, and also, that there is a discontinuity in the test particle's velocity when crossing the domain wall. The latter is unexpecte... |
1411.4043 | George Alekseev A. | G.A.Alekseev | Application of Monodromy Transform Method to Solution of Einstein -
Maxwell Equations with Isometries | 2 pages. This is the English translation of the text published in
1988 in Russian | Proceedings of the VIIth All-Union conference (Erevan, 1988)
"Modern Theoretical and Experimental Problems of General Relativity and
Gravitation", pp. 468 - 469 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Applications of the monodromy transform approach to construction of exact
solutions of electrovacuum Einstein - Maxwell field equations are considered.
Examples of new solutions are given.
| [
{
"created": "Thu, 13 Nov 2014 23:06:02 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Alekseev",
"G. A.",
""
]
] | Applications of the monodromy transform approach to construction of exact solutions of electrovacuum Einstein - Maxwell field equations are considered. Examples of new solutions are given. |
1510.02314 | Martin Zofka | Ji\v{r}\'i Ryzner, Martin \v{Z}ofka | Electrogeodesics in the di-hole Majumdar-Papapetrou spacetime | 15 pages, 5 figures | Class. Quantum Grav. 32 (2015) 205010 | 10.1088/0264-9381/32/20/205010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the (electro-)geodesic structure of the Majumdar-Papapetrou
solution representing static charged black holes in equilibrium. We assume only
two point sources, imparting thus the spacetime axial symmetry. We study
electrogeodesics both in and off the equatorial plane and explore the stability
of circula... | [
{
"created": "Thu, 8 Oct 2015 13:44:51 GMT",
"version": "v1"
}
] | 2015-10-09 | [
[
"Ryzner",
"Jiří",
""
],
[
"Žofka",
"Martin",
""
]
] | We investigate the (electro-)geodesic structure of the Majumdar-Papapetrou solution representing static charged black holes in equilibrium. We assume only two point sources, imparting thus the spacetime axial symmetry. We study electrogeodesics both in and off the equatorial plane and explore the stability of circular ... |
1912.05202 | Diego Rubiera-Garcia | Gonzalo J. Olmo, Diego Rubiera-Garcia, Aneta Wojnar | Stellar structure models in modified theories of gravity: lessons and
challenges | Review article, 90 pages. v2: new content, references, and many
additional corrections. To appear in Physics Reports | Phys. Rept. 876 (2020) 1-75 | 10.1016/j.physrep.2020.07.001 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The understanding of stellar structure represents the crossroads of our
theories of the nuclear force and the gravitational interaction under the most
extreme conditions observably accessible. It provides a powerful probe of the
strong field regime of General Relativity, and opens fruitful avenues for the
exploration... | [
{
"created": "Wed, 11 Dec 2019 09:41:57 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jul 2020 12:49:23 GMT",
"version": "v2"
}
] | 2020-09-15 | [
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
],
[
"Wojnar",
"Aneta",
""
]
] | The understanding of stellar structure represents the crossroads of our theories of the nuclear force and the gravitational interaction under the most extreme conditions observably accessible. It provides a powerful probe of the strong field regime of General Relativity, and opens fruitful avenues for the exploration o... |
1804.05023 | Grigoris Panotopoulos | Grigoris Panotopoulos and Il\'idio Lopes | Millisecond pulsars modelled as strange quark stars admixed with
condensed dark matter | 13 pages, 2 figures, 3 tables | null | 10.1142/S0218271818500931 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study for the first time how a new class of stars could impact an ensemble
of pulsars with known masses and spin-periods. These new compact objects are
strange stars admixed with condensed dark matter. In this exploratory
theoretical work, our goal is to determine how the basic parameters of pulsars
are modified f... | [
{
"created": "Fri, 13 Apr 2018 16:48:29 GMT",
"version": "v1"
}
] | 2018-04-16 | [
[
"Panotopoulos",
"Grigoris",
""
],
[
"Lopes",
"Ilídio",
""
]
] | We study for the first time how a new class of stars could impact an ensemble of pulsars with known masses and spin-periods. These new compact objects are strange stars admixed with condensed dark matter. In this exploratory theoretical work, our goal is to determine how the basic parameters of pulsars are modified for... |
2007.11359 | Konstantin Osetrin | Konstantin Osetrin and Evgeny Osetrin | Shapovalov wave-like spacetimes | 17 pages | SYMMETRY-BASEL, 12 (2020), 8, 1372 | 10.3390/SYM12081372 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A complete classification of space-time models is presented, which admit the
privileged coordinate systems, where the Hamilton-Jacobi equation for a test
particle is integrated by the method of complete separation of variables with
separation of the isotropic (wave) variable, on which the metric of space
depends (wav... | [
{
"created": "Wed, 22 Jul 2020 12:14:54 GMT",
"version": "v1"
}
] | 2022-07-01 | [
[
"Osetrin",
"Konstantin",
""
],
[
"Osetrin",
"Evgeny",
""
]
] | A complete classification of space-time models is presented, which admit the privileged coordinate systems, where the Hamilton-Jacobi equation for a test particle is integrated by the method of complete separation of variables with separation of the isotropic (wave) variable, on which the metric of space depends (wave-... |
2102.03544 | Julio Arrechea | Julio Arrechea, Carlos Barcel\'o, Ra\'ul Carballo-Rubio, Luis J. Garay | Reissner-Nordstr\"om geometry counterpart in semiclassical gravity | 36 pages, 7 figures | null | 10.1088/1361-6382/abf628 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the Renormalized Stress-Energy Tensor (RSET) of a massless
minimally coupled scalar field in the Regularized Polyakov approximation, as
well as its backreaction, on the classical Reissner-Nordstr\"om spacetime. The
complete set of solutions of the semiclassical self-consistent equations is
obtained and com... | [
{
"created": "Sat, 6 Feb 2021 09:30:18 GMT",
"version": "v1"
}
] | 2021-06-09 | [
[
"Arrechea",
"Julio",
""
],
[
"Barceló",
"Carlos",
""
],
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Garay",
"Luis J.",
""
]
] | We compute the Renormalized Stress-Energy Tensor (RSET) of a massless minimally coupled scalar field in the Regularized Polyakov approximation, as well as its backreaction, on the classical Reissner-Nordstr\"om spacetime. The complete set of solutions of the semiclassical self-consistent equations is obtained and compa... |
gr-qc/9705009 | Amina Helmi | Amina Helmi and Hector Vucetich | Non-Integrability and Chaos in Classical Cosmology | 6 pages, RevTeX, accepted by Physics Letters A | null | 10.1016/S0375-9601(97)00258-2 | null | gr-qc | null | A brief analysis of the dynamics of a Friedmann-Robertson-Walker universe
with a conformally coupled, real, self-interacting, massive scalar field, based
on the Painleve theory of differential equations, is presented. Our results
complete earlier works done within the framework of Dynamical System Theory. We
conclude... | [
{
"created": "Wed, 7 May 1997 10:41:21 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Helmi",
"Amina",
""
],
[
"Vucetich",
"Hector",
""
]
] | A brief analysis of the dynamics of a Friedmann-Robertson-Walker universe with a conformally coupled, real, self-interacting, massive scalar field, based on the Painleve theory of differential equations, is presented. Our results complete earlier works done within the framework of Dynamical System Theory. We conclude t... |
0812.1642 | Balakin Alexander | A.B. Balakin and H. Dehnen | Non-minimal Einstein-Yang-Mills-dilaton theory | 10 pages, no figures. Contribution to "Problems of Modern Cosmology",
special volume on the occasion of 50th birthday of Prof. S.D. Odintsov | null | null | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish a new non-minimal Einstein-Yang-Mills-dilaton model, for which
the Lagrangian is linear in the curvature and contains eight arbitrary
functions of the scalar (dilaton) field. The self-consistent system of
equations for the non-minimally coupled gauge, scalar and gravitational fields
is derived. As an exa... | [
{
"created": "Tue, 9 Dec 2008 09:55:50 GMT",
"version": "v1"
}
] | 2008-12-10 | [
[
"Balakin",
"A. B.",
""
],
[
"Dehnen",
"H.",
""
]
] | We establish a new non-minimal Einstein-Yang-Mills-dilaton model, for which the Lagrangian is linear in the curvature and contains eight arbitrary functions of the scalar (dilaton) field. The self-consistent system of equations for the non-minimally coupled gauge, scalar and gravitational fields is derived. As an examp... |
2405.11786 | Hyerim Noh | Jai-chan Hwang and Hyerim Noh | Graviton-photon conversions in Euler-Heisenberg nonlinear
electrodynamics | 8 pages, no figure | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study graviton-photon conversions in an environment of the uniform and
constant magnetic field considering Euler-K\"ockel-Heisenberg-type nonlinear
corrections in electrodynamics. We take the transverse-tracefree gauge for
gravitons and employ both the field potential and the electric and magnetic
(EM) fields for ... | [
{
"created": "Mon, 20 May 2024 05:08:56 GMT",
"version": "v1"
}
] | 2024-05-21 | [
[
"Hwang",
"Jai-chan",
""
],
[
"Noh",
"Hyerim",
""
]
] | We study graviton-photon conversions in an environment of the uniform and constant magnetic field considering Euler-K\"ockel-Heisenberg-type nonlinear corrections in electrodynamics. We take the transverse-tracefree gauge for gravitons and employ both the field potential and the electric and magnetic (EM) fields for ph... |
0907.2520 | Seyed Hossein Hendi | S. H. Hendi | The relation between F(R) gravity and Einstein-conformally invariant
Maxwell source | 9 pages, one figures, references added | Phys.Lett.B690:220-223, 2010 | 10.1016/j.physletb.2010.05.035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the special case of $F(R)$ gravity, in which
$F(R)= R^{N}$ and obtain its topological black hole solutions in higher
dimensions. We show that, the same as higher dimensional charged black hole,
these solutions may be interpreted as black hole solutions with two event
horizons, extreme black... | [
{
"created": "Wed, 15 Jul 2009 08:30:51 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2009 06:38:39 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Hendi",
"S. H.",
""
]
] | In this paper, we consider the special case of $F(R)$ gravity, in which $F(R)= R^{N}$ and obtain its topological black hole solutions in higher dimensions. We show that, the same as higher dimensional charged black hole, these solutions may be interpreted as black hole solutions with two event horizons, extreme black h... |
gr-qc/0206043 | Hagen Kleinert | V. Folomeev, V. Gurovich, H. Kleinert, and H.-J. Schmidt | Flashing Dark Matter-- Gamma-Ray Bursts from Relativistic Detonations of
Electro-Dilaton Stars | Author Information under
http://www.physik.fu-berlin.de/~kleinert/institution.html . Latest update of
paper (including all PS fonts) at
http://www.physik.fu-berlin.de/~kleinert/326 | Grav.Cosmol. 8 (2002) 299-304 | null | null | gr-qc | null | We speculate that the universe is filled with stars composed of
electromagnetic and dilaton fields which are the sources of the powerful
gamma-ray bursts impinging upon us from all directions of the universe. We
calculate soliton-like solutions of these fields and show that their energy can
be converted into a relati... | [
{
"created": "Sat, 15 Jun 2002 08:47:00 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Aug 2002 11:11:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Folomeev",
"V.",
""
],
[
"Gurovich",
"V.",
""
],
[
"Kleinert",
"H.",
""
],
[
"Schmidt",
"H. -J.",
""
]
] | We speculate that the universe is filled with stars composed of electromagnetic and dilaton fields which are the sources of the powerful gamma-ray bursts impinging upon us from all directions of the universe. We calculate soliton-like solutions of these fields and show that their energy can be converted into a relativi... |
2210.02140 | Seema Satin | Seema Satin | Formalism for stochastic perturbations and analysis in relativistic
stars | null | null | 10.1007/s10714-023-03084-w | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Perturbed Einstein's equations with a linear response relation and a
stochastic source, applicable to a relativistic star model are worked out .
These perturbations which are stochastic in nature, are of significance for
building a non-equilibrium statistical theory in connections with relativistic
astrophysics. A fl... | [
{
"created": "Wed, 5 Oct 2022 10:47:59 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Satin",
"Seema",
""
]
] | Perturbed Einstein's equations with a linear response relation and a stochastic source, applicable to a relativistic star model are worked out . These perturbations which are stochastic in nature, are of significance for building a non-equilibrium statistical theory in connections with relativistic astrophysics. A fluc... |
gr-qc/0205132 | Mauricio Cataldo | P. Salgado, M. Cataldo and S. del Campo | Higher dimensional gravity invariant under the Poincare group | 7 pages, Latex, accepted in Phys. Rev. D | Phys.Rev.D66:024013,2002 | 10.1103/PhysRevD.66.024013 | null | gr-qc | null | It is shown that the Stelle-West Grignani-Nardelli-formalism allows, both
when odd dimensions and when even dimensions are considered, constructing
actions for higher dimensional gravity invariant under local Lorentz rotations
and under local Poincar\`{e} translations. It is also proved that such actions
have the sam... | [
{
"created": "Thu, 30 May 2002 21:12:46 GMT",
"version": "v1"
}
] | 2009-02-11 | [
[
"Salgado",
"P.",
""
],
[
"Cataldo",
"M.",
""
],
[
"del Campo",
"S.",
""
]
] | It is shown that the Stelle-West Grignani-Nardelli-formalism allows, both when odd dimensions and when even dimensions are considered, constructing actions for higher dimensional gravity invariant under local Lorentz rotations and under local Poincar\`{e} translations. It is also proved that such actions have the same ... |
0704.0993 | Piotr Bizon | Piotr Bizo\'n, Tadeusz Chmaj, Andrzej Rostworowski | Late-time tails of a Yang-Mills field on Minkowski and Schwarzschild
backgrounds | 7 pages, 3 figures | Class.Quant.Grav.24:F55-F63,2007 | 10.1088/0264-9381/24/13/F01 | null | gr-qc hep-th math.AP | null | We study the late-time behavior of spherically symmetric solutions of the
Yang-Mills equations on Minkowski and Schwarzschild backgrounds. Using
nonlinear perturbation theory we show in both cases that solutions having
smooth compactly supported initial data posses tails which decay as $t^{-4}$ at
timelike infinity. ... | [
{
"created": "Sat, 7 Apr 2007 17:33:44 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Apr 2007 11:07:20 GMT",
"version": "v2"
}
] | 2010-11-02 | [
[
"Bizoń",
"Piotr",
""
],
[
"Chmaj",
"Tadeusz",
""
],
[
"Rostworowski",
"Andrzej",
""
]
] | We study the late-time behavior of spherically symmetric solutions of the Yang-Mills equations on Minkowski and Schwarzschild backgrounds. Using nonlinear perturbation theory we show in both cases that solutions having smooth compactly supported initial data posses tails which decay as $t^{-4}$ at timelike infinity. Mo... |
1809.10064 | Christos Tsagas | D. Kranas, C.G. Tsagas, J.D. Barrow, D. Iosifidis | Friedmann-like universes with torsion | Revised article. Section on BBN limits on torsion added. References
added and updated | null | 10.1140/epjc/s10052-019-6822-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider spatially homogeneous and isotropic cosmologies with non-zero
torsion. Given the high symmetry of these universes, we adopt a specific form
for the torsion tensor that preserves the homogeneity and isotropy of the
spatial surfaces. Employing both covariant and metric-based techniques, we
derive the torsio... | [
{
"created": "Wed, 26 Sep 2018 15:30:37 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Oct 2018 18:54:27 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Kranas",
"D.",
""
],
[
"Tsagas",
"C. G.",
""
],
[
"Barrow",
"J. D.",
""
],
[
"Iosifidis",
"D.",
""
]
] | We consider spatially homogeneous and isotropic cosmologies with non-zero torsion. Given the high symmetry of these universes, we adopt a specific form for the torsion tensor that preserves the homogeneity and isotropy of the spatial surfaces. Employing both covariant and metric-based techniques, we derive the torsiona... |
gr-qc/0701046 | Farrukh Fattoyev Jabborovich | B.J. Ahmedov | Ohm's Law in General Relativity and Coriolis Force Effects in Rotating
Conductors | 5 pages | Grav.Cosmol. 4 (1998) 139-141 | null | null | gr-qc astro-ph | null | It has been shown that a magnetic field proportional to angular velocity of
rotation $\omega$ arises around a rotating conductor with the radial gradient
of temperature $\nabla_r T$. However, the theoretical value of the
proportionality coefficient $10^{-17} {\rm cm}^{5/2}\cdot {\rm g}^{1/2}\cdot
{\rm deg}^{-1}$ does... | [
{
"created": "Sun, 7 Jan 2007 11:40:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ahmedov",
"B. J.",
""
]
] | It has been shown that a magnetic field proportional to angular velocity of rotation $\omega$ arises around a rotating conductor with the radial gradient of temperature $\nabla_r T$. However, the theoretical value of the proportionality coefficient $10^{-17} {\rm cm}^{5/2}\cdot {\rm g}^{1/2}\cdot {\rm deg}^{-1}$ does n... |
2001.09613 | Masashi Kimura | Masashi Kimura | Note on the parametrized black hole quasinormal ringdown formalism | 10 pages, v2: minor revisions, v3: title changed, accepted for
publication in Phys. Rev. D, v4: corrected typo in Eq.(10) | Phys. Rev. D 101, 064031 (2020) | 10.1103/PhysRevD.101.064031 | RUP-20-2 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parametrized black hole quasinormal ringdown formalism is useful to
compute quasinormal mode (QNM) frequencies if a master equation for the
gravitational perturbation around a black hole has a small deviation from the
Regge-Wheeler or Zerilli equation. In this formalism, the deviation of QNM
frequency from genera... | [
{
"created": "Mon, 27 Jan 2020 07:38:21 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Feb 2020 01:32:44 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Mar 2020 13:11:09 GMT",
"version": "v3"
},
{
"created": "Thu, 26 Jan 2023 03:56:21 GMT",
"version": "v4"
}
] | 2023-01-27 | [
[
"Kimura",
"Masashi",
""
]
] | The parametrized black hole quasinormal ringdown formalism is useful to compute quasinormal mode (QNM) frequencies if a master equation for the gravitational perturbation around a black hole has a small deviation from the Regge-Wheeler or Zerilli equation. In this formalism, the deviation of QNM frequency from general ... |
2112.04116 | Leonardo Modesto | Leonardo Modesto, Tian Zhou, Qiang Li | Geometric origin of the galaxies' dark side | 31 pages, 8 figures | null | null | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Einstein's conformal gravity is able to explain simply on the
geometric ground the galactic rotation curves without need to introduce any
modification in both the gravitational as well as in the matter sector of the
theory. The geometry of each galaxy is described by a metric obtained making a
singular r... | [
{
"created": "Wed, 8 Dec 2021 05:00:10 GMT",
"version": "v1"
}
] | 2021-12-09 | [
[
"Modesto",
"Leonardo",
""
],
[
"Zhou",
"Tian",
""
],
[
"Li",
"Qiang",
""
]
] | We show that Einstein's conformal gravity is able to explain simply on the geometric ground the galactic rotation curves without need to introduce any modification in both the gravitational as well as in the matter sector of the theory. The geometry of each galaxy is described by a metric obtained making a singular res... |
1007.1803 | L. C. Garcia de Andrade | Garcia de Andrade | Primordial magnetic fields of non-minimal photon-torsion axial coupling
origin | depto de fisica teorica, if uerj, state rio de janeiro university | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Dynamo action is shown to be induced from homogeneous non-minimal
photon-torsion axial coupling in the quantum electrodynamics (QED) framework in
Riemann flat spacetime contortion decays. The geometrical optics in
Riemann-Cartan spacetime is considering and a plane wave expansion of the
electromagnetic vector potenti... | [
{
"created": "Sun, 11 Jul 2010 21:36:42 GMT",
"version": "v1"
}
] | 2010-07-13 | [
[
"de Andrade",
"Garcia",
""
]
] | Dynamo action is shown to be induced from homogeneous non-minimal photon-torsion axial coupling in the quantum electrodynamics (QED) framework in Riemann flat spacetime contortion decays. The geometrical optics in Riemann-Cartan spacetime is considering and a plane wave expansion of the electromagnetic vector potential... |
1911.00350 | Saibal Ray | Abdul Aziz, Saibal Ray, Farook Rahaman and B.K. Guha | Neutron star under homotopy perturbation method | 31 pages, 8 figures | Annals of Physics 409 (2019) 167918 | 10.1016/j.aop.2019.167918 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a mass function solving the Tolman-Oppenheimer-Volkoff (TOV)
equation for isotropic and spherically symmetric system via homotopy
perturbation method (HPM). Using the mass function we construct a stellar model
which can be determined from the equation of state (EOS) parameter ($\omega$)
and a model paramete... | [
{
"created": "Thu, 31 Oct 2019 17:05:42 GMT",
"version": "v1"
}
] | 2019-11-04 | [
[
"Aziz",
"Abdul",
""
],
[
"Ray",
"Saibal",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Guha",
"B. K.",
""
]
] | We obtain a mass function solving the Tolman-Oppenheimer-Volkoff (TOV) equation for isotropic and spherically symmetric system via homotopy perturbation method (HPM). Using the mass function we construct a stellar model which can be determined from the equation of state (EOS) parameter ($\omega$) and a model parameter ... |
gr-qc/0006057 | Ken-ichi Nakao | K. Nakao, H. Iguchi and T. Harada | Newtonian Analysis of Gravitational Waves from Naked Singularity | 23 pages, 8 figures | Phys.Rev. D63 (2001) 084003 | 10.1103/PhysRevD.63.084003 | OCU-PHYS-176, OU-TAP 139, WU-AP/105/00 | gr-qc | null | Spherical dust collapse generally forms a shell focusing naked singularity at
the symmetric center. This naked singularity is massless. Further the Newtonian
gravitational potential and speed of the dust fluid elements are everywhere
much smaller than unity until the central shell focusing naked singularity
formation... | [
{
"created": "Fri, 16 Jun 2000 07:12:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Nakao",
"K.",
""
],
[
"Iguchi",
"H.",
""
],
[
"Harada",
"T.",
""
]
] | Spherical dust collapse generally forms a shell focusing naked singularity at the symmetric center. This naked singularity is massless. Further the Newtonian gravitational potential and speed of the dust fluid elements are everywhere much smaller than unity until the central shell focusing naked singularity formation i... |
gr-qc/0609102 | Claudio Simeone | Marc Thibeault and Claudio Simeone | Comment on the choice of time in a two-component formulation of the
Wheeler--DeWitt equation | 8 pages; version accepted for publication in Int. J. Mod. Phys. D | null | 10.1142/S0218271807010705 | null | gr-qc hep-th math-ph math.MP | null | The two-component formalism in quantum cosmology is revisited with a
particular emphasis on the identification of time. Its relation with the
appearance of imaginary eigenvalues is established. It is explicitly shown how
a good choice of the global time prevents this peculiarity.
| [
{
"created": "Fri, 22 Sep 2006 14:04:26 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Apr 2007 13:27:20 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Thibeault",
"Marc",
""
],
[
"Simeone",
"Claudio",
""
]
] | The two-component formalism in quantum cosmology is revisited with a particular emphasis on the identification of time. Its relation with the appearance of imaginary eigenvalues is established. It is explicitly shown how a good choice of the global time prevents this peculiarity. |
2203.07854 | Ding Jia | Ding Jia | Light ray fluctuations in simplicial quantum gravity | 41 pages, 42 figures, matches published version well | (2022) Class. Quantum Grav. 39 135005 | 10.1088/1361-6382/ac7026 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A non-perturbative study on the quantum fluctuations of light ray propagation
through a quantum region of spacetime is long overdue. Within the theory of
Lorentzian simplicial quantum gravity, we compute the probabilities for a test
light ray to land at different locations after travelling through a
symmetry-reduced ... | [
{
"created": "Fri, 11 Mar 2022 20:23:39 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2022 12:32:11 GMT",
"version": "v2"
}
] | 2022-06-14 | [
[
"Jia",
"Ding",
""
]
] | A non-perturbative study on the quantum fluctuations of light ray propagation through a quantum region of spacetime is long overdue. Within the theory of Lorentzian simplicial quantum gravity, we compute the probabilities for a test light ray to land at different locations after travelling through a symmetry-reduced bo... |
1912.06047 | Jochen Zahn | Stefan Hollands, Robert M. Wald, Jochen Zahn | Quantum Instability of the Cauchy Horizon in
Reissner-Nordstr\"om-deSitter Spacetime | 50 pages, abstract truncated due to arXiv length restriction. v2:
minor corrections | null | 10.1088/1361-6382/ab8052 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In classical General Relativity, the values of fields on spacetime are
uniquely determined by their values at an initial time within the domain of
dependence of this initial data surface. However, it may occur that the
spacetime under consideration extends beyond this domain of dependence, and
fields, therefore, are ... | [
{
"created": "Thu, 12 Dec 2019 15:50:09 GMT",
"version": "v1"
},
{
"created": "Mon, 18 May 2020 12:51:43 GMT",
"version": "v2"
}
] | 2020-05-19 | [
[
"Hollands",
"Stefan",
""
],
[
"Wald",
"Robert M.",
""
],
[
"Zahn",
"Jochen",
""
]
] | In classical General Relativity, the values of fields on spacetime are uniquely determined by their values at an initial time within the domain of dependence of this initial data surface. However, it may occur that the spacetime under consideration extends beyond this domain of dependence, and fields, therefore, are no... |
1806.05539 | Scott Robertson | L\'eo-Paul Euv\'e, Scott Robertson, Nicolas James, Alessandro Fabbri
and Germain Rousseaux | Scattering of co-current surface waves on an analogue black hole | 15 pages, 13 figures | Phys. Rev. Lett. 124, 141101 (2020) | 10.1103/PhysRevLett.124.141101 | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on what is to our knowledge the first scattering experiment of
surface waves on an accelerating transcritical flow, which in the Analogue
Gravity context is described by an effective spacetime with a black-hole
horizon. This spacetime has been probed by an incident co-current wave, which
partially scatters ... | [
{
"created": "Thu, 14 Jun 2018 13:39:02 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2019 11:59:28 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Apr 2020 09:58:27 GMT",
"version": "v3"
}
] | 2020-04-09 | [
[
"Euvé",
"Léo-Paul",
""
],
[
"Robertson",
"Scott",
""
],
[
"James",
"Nicolas",
""
],
[
"Fabbri",
"Alessandro",
""
],
[
"Rousseaux",
"Germain",
""
]
] | We report on what is to our knowledge the first scattering experiment of surface waves on an accelerating transcritical flow, which in the Analogue Gravity context is described by an effective spacetime with a black-hole horizon. This spacetime has been probed by an incident co-current wave, which partially scatters in... |
gr-qc/0501005 | Marc Casals | Marc Casals and Adrian C. Ottewill | Canonical Quantization of the Electromagnetic Field on the Kerr
Background | 27 zipped, postscript figure files | Phys.Rev.D71:124016,2005 | 10.1103/PhysRevD.71.124016 | null | gr-qc | null | We investigate the canonical quantization of the electromagnetic field on the
Kerr background. We give new expressions for the expectation value of the
electromagnetic stress-energy tensor in various vacua states and give a
physical interpretation of the separate terms appearing in them. We numerically
calculate the ... | [
{
"created": "Mon, 3 Jan 2005 19:44:39 GMT",
"version": "v1"
}
] | 2010-12-23 | [
[
"Casals",
"Marc",
""
],
[
"Ottewill",
"Adrian C.",
""
]
] | We investigate the canonical quantization of the electromagnetic field on the Kerr background. We give new expressions for the expectation value of the electromagnetic stress-energy tensor in various vacua states and give a physical interpretation of the separate terms appearing in them. We numerically calculate the lu... |
0903.4774 | Luis Herrera | L. Herrera, G. Le Denmat, N.O. Santos | Expansion-Free Evolving Spheres Must Have Inhomogeneous Energy Density
Distributions | 8 pages, Latex. To appear in Phys. Rev.D. Typos corrected | Phys. Rev. D79, (2009), 087505 | 10.1103/PhysRevD.79.087505 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper a systematic study on shearing expansion-free spherically
symmetric distributions was presented. As a particular case of such systems,
the Skripkin model was mentioned, which corresponds to a nondissipative perfect
fluid with a constant energy density. Here we show that such a model is
inconsistent ... | [
{
"created": "Fri, 27 Mar 2009 11:04:54 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2009 14:18:01 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Herrera",
"L.",
""
],
[
"Denmat",
"G. Le",
""
],
[
"Santos",
"N. O.",
""
]
] | In a recent paper a systematic study on shearing expansion-free spherically symmetric distributions was presented. As a particular case of such systems, the Skripkin model was mentioned, which corresponds to a nondissipative perfect fluid with a constant energy density. Here we show that such a model is inconsistent wi... |
gr-qc/0005018 | Guillermo F. Rubilar | Yuri N. Obukhov, Tetsuo Fukui and Guillermo Rubilar | Wave propagation in linear electrodynamics | 13 pages. Phys. Rev. D, to appear | Phys.Rev. D62 (2000) 044050 | 10.1103/PhysRevD.62.044050 | null | gr-qc | null | The Fresnel equation governing the propagation of electromagnetic waves for
the most general linear constitutive law is derived. The wave normals are found
to lie, in general, on a fourth order surface. When the constitutive
coefficients satisfy the so-called reciprocity or closure relation, one can
define a duality ... | [
{
"created": "Fri, 5 May 2000 22:53:54 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Obukhov",
"Yuri N.",
""
],
[
"Fukui",
"Tetsuo",
""
],
[
"Rubilar",
"Guillermo",
""
]
] | The Fresnel equation governing the propagation of electromagnetic waves for the most general linear constitutive law is derived. The wave normals are found to lie, in general, on a fourth order surface. When the constitutive coefficients satisfy the so-called reciprocity or closure relation, one can define a duality op... |
1805.10440 | Hongwei Xiong | Hongwei Xiong | On the quantitative calculation of the cosmological constant of the
quantum vacuum | 16 pages, 1 figure | null | null | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is widely believed that as one of the candidates for dark energy, the
cosmological constant should relate directly with the quantum vacuum. Despite
decades of theoretical effects, however, there is still no quantitative
interpretation of the observed cosmological constant. In this work, we consider
the quantum sta... | [
{
"created": "Sat, 26 May 2018 07:51:27 GMT",
"version": "v1"
}
] | 2018-05-29 | [
[
"Xiong",
"Hongwei",
""
]
] | It is widely believed that as one of the candidates for dark energy, the cosmological constant should relate directly with the quantum vacuum. Despite decades of theoretical effects, however, there is still no quantitative interpretation of the observed cosmological constant. In this work, we consider the quantum state... |
0808.1473 | Nikolay Popov N | Nikolay Popov | The complementary group of proper motions of the Minkowski metric in an
arbitrary dimension space | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the Poincare group which is a semidirect product of the
group of translations and the Lorentz group, is not a single physicaly
important group of proper motions of Minkowski metric. The complementary group
of proper motions of the metric in a class of noninertial reference system has
been found.
| [
{
"created": "Mon, 11 Aug 2008 09:19:46 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Aug 2008 08:24:09 GMT",
"version": "v2"
}
] | 2008-08-26 | [
[
"Popov",
"Nikolay",
""
]
] | It is shown that the Poincare group which is a semidirect product of the group of translations and the Lorentz group, is not a single physicaly important group of proper motions of Minkowski metric. The complementary group of proper motions of the metric in a class of noninertial reference system has been found. |
1207.4956 | Yan Wang | Yan Wang, Yu Shang, Stanislav Babak | EMRI data analysis with a phenomenological waveform | 13 pages, 9 figures, RevTex 4.1 | Phys. Rev. D 86, 104050 (2012) | 10.1103/PhysRevD.86.104050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extreme mass ratio inspirals (EMRIs) (capture and inspiral of a compact
stellar mass object into a Massive Black Hole (MBH)) are among the most
interesting objects for the gravitational wave astronomy. It is a very
challenging task to detect those sources with the accurate estimation
parameters of binaries primarily ... | [
{
"created": "Fri, 20 Jul 2012 14:01:55 GMT",
"version": "v1"
}
] | 2014-09-11 | [
[
"Wang",
"Yan",
""
],
[
"Shang",
"Yu",
""
],
[
"Babak",
"Stanislav",
""
]
] | Extreme mass ratio inspirals (EMRIs) (capture and inspiral of a compact stellar mass object into a Massive Black Hole (MBH)) are among the most interesting objects for the gravitational wave astronomy. It is a very challenging task to detect those sources with the accurate estimation parameters of binaries primarily du... |
2105.08998 | Benedict Schinnerl | Jakob Hedicke, Ettore Minguzzi, Benedict Schinnerl, Roland Steinbauer,
Stefan Suhr | Causal simplicity and (maximal) null pseudoconvexity | null | Class. Quantum Grav. 38 (2021) 227002 | 10.1088/1361-6382/ac2be1 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We consider pseudoconvexity properties in Lorentzian and Riemannian manifolds
and their relationship in static spacetimes. We provide an example of a
causally continuous and maximal null pseudoconvex spacetime that fails to be
causally simple. Its Riemannian factor provides an analogous example of a
manifold that is ... | [
{
"created": "Wed, 19 May 2021 09:05:02 GMT",
"version": "v1"
}
] | 2021-11-30 | [
[
"Hedicke",
"Jakob",
""
],
[
"Minguzzi",
"Ettore",
""
],
[
"Schinnerl",
"Benedict",
""
],
[
"Steinbauer",
"Roland",
""
],
[
"Suhr",
"Stefan",
""
]
] | We consider pseudoconvexity properties in Lorentzian and Riemannian manifolds and their relationship in static spacetimes. We provide an example of a causally continuous and maximal null pseudoconvex spacetime that fails to be causally simple. Its Riemannian factor provides an analogous example of a manifold that is mi... |
1212.1981 | Francesco Caravelli Dr | Francesco Caravelli, Fotini Markopoulou, Arnau Riera, Lorenzo Sindoni | Quenches and lattice simulators for particle creation | 12 pages double column, 7 figures (several clarifications, typos
corrected and reference added in v2) | null | null | null | gr-qc cond-mat.other hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we propose a framework for simulating thermal particle
production in condensed matter systems. The procedure we describe can be
realized by means of a quantum quench of a parameter in the model. In order to
support this claim, we study quadratic fermionic systems in one and two
dimensions by means of an... | [
{
"created": "Mon, 10 Dec 2012 06:30:57 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2013 11:57:23 GMT",
"version": "v2"
}
] | 2013-02-12 | [
[
"Caravelli",
"Francesco",
""
],
[
"Markopoulou",
"Fotini",
""
],
[
"Riera",
"Arnau",
""
],
[
"Sindoni",
"Lorenzo",
""
]
] | In this paper we propose a framework for simulating thermal particle production in condensed matter systems. The procedure we describe can be realized by means of a quantum quench of a parameter in the model. In order to support this claim, we study quadratic fermionic systems in one and two dimensions by means of anal... |
1301.5458 | Juan A. Valiente-Kroon | Christian L\"ubbe and J. A. Valiente Kroon | A class of conformal curves in the Reissner-Nordstr\"om spacetime | 32 pages, 2 figures | null | 10.1007/s00023-013-0276-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of curves with special conformal properties (conformal curves) is
studied on the Reissner-Nordstr\"om spacetime. It is shown that initial data
for the conformal curves can be prescribed so that the resulting congruence of
curves extends smoothly to future and past null infinity. The formation of
conjugate poi... | [
{
"created": "Wed, 23 Jan 2013 10:17:54 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Lübbe",
"Christian",
""
],
[
"Kroon",
"J. A. Valiente",
""
]
] | A class of curves with special conformal properties (conformal curves) is studied on the Reissner-Nordstr\"om spacetime. It is shown that initial data for the conformal curves can be prescribed so that the resulting congruence of curves extends smoothly to future and past null infinity. The formation of conjugate point... |
1806.06700 | Eugen Radu | Terence Delsate, Carlos Herdeiro and Eugen Radu | Non-perturbative spinning black holes in dynamical Chern-Simons gravity | 14 pages, 5 figures | null | 10.1016/j.physletb.2018.09.060 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spinning black holes in dynamical Einstein-Chern-Simons gravity are
constructed by directly solving the field equations, without resorting to any
perturbative expansion. This model is obtained by adding to the
Einstein-Hilbert action a particular higher-curvature correction: the
Pontryagin density, linearly coupled t... | [
{
"created": "Mon, 18 Jun 2018 13:57:23 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2018 20:33:14 GMT",
"version": "v2"
}
] | 2018-10-24 | [
[
"Delsate",
"Terence",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Radu",
"Eugen",
""
]
] | Spinning black holes in dynamical Einstein-Chern-Simons gravity are constructed by directly solving the field equations, without resorting to any perturbative expansion. This model is obtained by adding to the Einstein-Hilbert action a particular higher-curvature correction: the Pontryagin density, linearly coupled to ... |
gr-qc/9710064 | PEREZ BERGLIAFFA San | Santiago E. Perez Bergliaffa, Gustavo E. Romero, Hector Vucetich | Steps towards an axiomatic pregeometry of space-time | LaTex, 15 pages, submitted to Int. J. of Theor. Phys | Int.J.Theor.Phys. 37 (1998) 2281 | null | null | gr-qc quant-ph | null | We present a deductive theory of space-time which is realistic, objective,
and relational. It is realistic because it assumes the existence of physical
things endowed with concrete properties. It is objective because it can be
formulated without any reference to cognoscent subjects or sensorial fields.
Finally, it is... | [
{
"created": "Sat, 11 Oct 1997 14:25:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bergliaffa",
"Santiago E. Perez",
""
],
[
"Romero",
"Gustavo E.",
""
],
[
"Vucetich",
"Hector",
""
]
] | We present a deductive theory of space-time which is realistic, objective, and relational. It is realistic because it assumes the existence of physical things endowed with concrete properties. It is objective because it can be formulated without any reference to cognoscent subjects or sensorial fields. Finally, it is r... |
1403.4351 | Wen-Yu Wen | June-Yu Wei, Wen-Yu Wen | The small and large D limit of Parikh-Wilczek tunneling model for
Hawking radiation | 7 pages, updated version submitted to CQG | Class. Quantum Grav. 31 (2014) 137001 | 10.1088/0264-9381/31/13/137001 | CYCU-HEP-14-04 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we study both the small and large dimension $D$ limit of the
tunneling model of Hwaking radiation proposed by Parikh and
Wilczek\cite{Parikh:1999mf}. We confirm that the result $\Gamma \sim e^{\Delta
S}$ is still valid for arbitrary $D>3$. The sensible large $D$ limit is given
by $\sqrt{D} \ll r_0$ in o... | [
{
"created": "Tue, 18 Mar 2014 05:45:27 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2014 15:08:37 GMT",
"version": "v2"
}
] | 2014-06-17 | [
[
"Wei",
"June-Yu",
""
],
[
"Wen",
"Wen-Yu",
""
]
] | In this note, we study both the small and large dimension $D$ limit of the tunneling model of Hwaking radiation proposed by Parikh and Wilczek\cite{Parikh:1999mf}. We confirm that the result $\Gamma \sim e^{\Delta S}$ is still valid for arbitrary $D>3$. The sensible large $D$ limit is given by $\sqrt{D} \ll r_0$ in ord... |
1006.0181 | Gil Jannes | C. Barcelo, L.J. Garay, G. Jannes | The two faces of quantum sound | 12 pages, 4 figures; v3: published version | Phys.Rev.D82:044042,2010 | 10.1103/PhysRevD.82.044042 | null | gr-qc cond-mat.quant-gas | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fluctuations around a Bose-Einstein condensate can be described by means of
Bogolubov theory leading to the notion of quasiparticle and antiquasiparticle
familiar to non-relativistic condensed matter practitioners. On the other hand,
we already know that these perturbations evolve according to a relativistic
Klein-Go... | [
{
"created": "Tue, 1 Jun 2010 16:47:46 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jul 2010 10:04:50 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Sep 2010 18:05:07 GMT",
"version": "v3"
}
] | 2014-11-21 | [
[
"Barcelo",
"C.",
""
],
[
"Garay",
"L. J.",
""
],
[
"Jannes",
"G.",
""
]
] | Fluctuations around a Bose-Einstein condensate can be described by means of Bogolubov theory leading to the notion of quasiparticle and antiquasiparticle familiar to non-relativistic condensed matter practitioners. On the other hand, we already know that these perturbations evolve according to a relativistic Klein-Gord... |
1505.04447 | Sam Dolan Dr | Patrick Nolan, Chris Kavanagh, Sam R Dolan, Adrian C Ottewill, Niels
Warburton and Barry Wardell | Octupolar invariants for compact binaries on quasi-circular orbits | 24 pages, 3 figures, 4 tables | Phys. Rev. D 92, 123008 (2015) | 10.1103/PhysRevD.92.123008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the gravitational self-force methodology to identify and compute
new $O(\mu)$ tidal invariants for a compact body of mass $\mu$ on a
quasi-circular orbit about a black hole of mass $M \gg \mu$. In the octupolar
sector we find seven new degrees of freedom, made up of 3+3
conservative/dissipative `electric' i... | [
{
"created": "Sun, 17 May 2015 20:01:18 GMT",
"version": "v1"
}
] | 2015-12-24 | [
[
"Nolan",
"Patrick",
""
],
[
"Kavanagh",
"Chris",
""
],
[
"Dolan",
"Sam R",
""
],
[
"Ottewill",
"Adrian C",
""
],
[
"Warburton",
"Niels",
""
],
[
"Wardell",
"Barry",
""
]
] | We extend the gravitational self-force methodology to identify and compute new $O(\mu)$ tidal invariants for a compact body of mass $\mu$ on a quasi-circular orbit about a black hole of mass $M \gg \mu$. In the octupolar sector we find seven new degrees of freedom, made up of 3+3 conservative/dissipative `electric' inv... |
gr-qc/9410014 | Jesus Barbero | J. Fernando Barbero | Real Ashtekar Variables for Lorentzian Signature Space-times | 10 pages, LATEX, Preprint CGPG-94/10-3 | Phys.Rev.D51:5507-5510,1995 | 10.1103/PhysRevD.51.5507 | null | gr-qc | null | I suggest in this letter a new strategy to attack the problem of the reality
conditions in the Ashtekar approach to classical and quantum general
relativity. By writing a modified Hamiltonian constraint in the usual $SO(3)$
Yang-Mills phase space I show that it is possible to describe space-times with
Lorentzian sign... | [
{
"created": "Tue, 11 Oct 1994 21:45:45 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Barbero",
"J. Fernando",
""
]
] | I suggest in this letter a new strategy to attack the problem of the reality conditions in the Ashtekar approach to classical and quantum general relativity. By writing a modified Hamiltonian constraint in the usual $SO(3)$ Yang-Mills phase space I show that it is possible to describe space-times with Lorentzian signat... |
gr-qc/0503052 | Adam D. Helfer | Adam D. Helfer | Quantum nature of black holes | 7 pages, 5 figures. Honorable mention in the 2004 Gravity Research
Foundation Essay Competition | Int.J.Mod.Phys. D13 (2004) 2299-2305 | 10.1142/S021827180400636X | null | gr-qc | null | I reconsider Hawking's analysis of the effects of gravitational collapse on
quantum fields, taking into account interactions between the fields. The
ultra-high energy vacuum fluctuations, which had been considered to be an
awkward peripheral feature of the analysis, are shown to play a key role. By
interactions, they... | [
{
"created": "Fri, 11 Mar 2005 15:38:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Helfer",
"Adam D.",
""
]
] | I reconsider Hawking's analysis of the effects of gravitational collapse on quantum fields, taking into account interactions between the fields. The ultra-high energy vacuum fluctuations, which had been considered to be an awkward peripheral feature of the analysis, are shown to play a key role. By interactions, they c... |
2211.03958 | Valerio Faraoni | Marcello Miranda, Pierre-Antoine Graham, Valerio Faraoni | Effective fluid mixture of tensor-multi-scalar gravity | 10 pages, latex | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply to tensor-multi-scalar gravity the effective fluid analysis based on
the representation of the gravitational scalar field as a dissipative effective
fluid. This generalization poses new challenges as the effective fluid is now a
complicated mixture of individual fluids mutually coupled to each other and
many... | [
{
"created": "Tue, 8 Nov 2022 02:16:12 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Miranda",
"Marcello",
""
],
[
"Graham",
"Pierre-Antoine",
""
],
[
"Faraoni",
"Valerio",
""
]
] | We apply to tensor-multi-scalar gravity the effective fluid analysis based on the representation of the gravitational scalar field as a dissipative effective fluid. This generalization poses new challenges as the effective fluid is now a complicated mixture of individual fluids mutually coupled to each other and many r... |
gr-qc/0003094 | Jose Luis Jaramillo | V. Aldaya, J.L. Jaramillo | Dynamical content of quantum diffeomorphisms in two-dimensional quantum
gravity | 4 pages, LaTeX, no figures; uses espcrc2.sty (twocolumn).
Contribution to the "Third Meeting on Constrained Dynamics and Quantum
Gravity QG99" held in Sardinia, Italy, on Sept. 1999. To appear in Nucl.
Phys. B (Proc. Suppl.) | Nucl.Phys.Proc.Suppl. 88 (2000) 229-232 | 10.1016/S0920-5632(00)00773-8 | null | gr-qc | null | A model for 2D-quantum gravity from the Virasoro symmetry is studied. The
notion of space-time naturally arises as a homogeneous space associated with
the kinematical (non-dynamical) SL(2,R) symmetry in the kernel of the
Lie-algebra central extension for the critical values of the conformal anomaly.
The rest of the g... | [
{
"created": "Fri, 24 Mar 2000 10:57:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Aldaya",
"V.",
""
],
[
"Jaramillo",
"J. L.",
""
]
] | A model for 2D-quantum gravity from the Virasoro symmetry is studied. The notion of space-time naturally arises as a homogeneous space associated with the kinematical (non-dynamical) SL(2,R) symmetry in the kernel of the Lie-algebra central extension for the critical values of the conformal anomaly. The rest of the gen... |
2407.11513 | Alesandro Santos | F. Ahmed, J. C. R. de Souza and A. F. Santos | Time-Machines Construct within Ricci-inverse Modified Gravity | 16 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, our objective is to explore a time-machine space-time
formulated in general relativity, as introduced by Li (Phys. Rev. D {\bf 59},
084016 (1999)), within the context of modified gravity theories. We consider
Ricci-inverse gravity of all Classes of models, {\it i.e.}, (i) Class-{\bf I}:
$f(\mathcal{R},... | [
{
"created": "Tue, 16 Jul 2024 08:49:54 GMT",
"version": "v1"
}
] | 2024-07-17 | [
[
"Ahmed",
"F.",
""
],
[
"de Souza",
"J. C. R.",
""
],
[
"Santos",
"A. F.",
""
]
] | In this paper, our objective is to explore a time-machine space-time formulated in general relativity, as introduced by Li (Phys. Rev. D {\bf 59}, 084016 (1999)), within the context of modified gravity theories. We consider Ricci-inverse gravity of all Classes of models, {\it i.e.}, (i) Class-{\bf I}: $f(\mathcal{R}, \... |
2001.00394 | Timothy Clifton | Timothy Clifton, Christopher S. Gallagher, Sophia Goldberg, Karim A.
Malik | Viable Gauge Choices in Cosmologies with Non-Linear Structures | 15 pages, 2 figures | Phys. Rev. D 101, 063530 (2020) | 10.1103/PhysRevD.101.063530 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A variety of gauges are used in cosmological perturbation theory. These are
often chosen in order to attribute physical properties to a particular choice
of coordinates, or otherwise to simplify the form of the resultant equations.
Calculations are then performed with the understanding that they could have
been done ... | [
{
"created": "Thu, 2 Jan 2020 11:18:59 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2020 11:36:34 GMT",
"version": "v2"
}
] | 2020-04-01 | [
[
"Clifton",
"Timothy",
""
],
[
"Gallagher",
"Christopher S.",
""
],
[
"Goldberg",
"Sophia",
""
],
[
"Malik",
"Karim A.",
""
]
] | A variety of gauges are used in cosmological perturbation theory. These are often chosen in order to attribute physical properties to a particular choice of coordinates, or otherwise to simplify the form of the resultant equations. Calculations are then performed with the understanding that they could have been done in... |
2007.01339 | Jordan Moxon | Jordan Moxon, Mark A. Scheel, Saul A. Teukolsky | Improved Cauchy-characteristic evolution system for high-precision
numerical relativity waveforms | null | Phys. Rev. D 102, 044052 (2020) | 10.1103/PhysRevD.102.044052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present several improvements to the Cauchy-characteristic evolution
procedure that generates high-fidelity gravitational waveforms at
$\mathcal{I}^+$ from numerical relativity simulations. Cauchy-characteristic
evolution combines an interior solution of the Einstein field equations based
on Cauchy slices with an e... | [
{
"created": "Thu, 2 Jul 2020 18:47:36 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Aug 2021 21:31:37 GMT",
"version": "v2"
}
] | 2021-08-24 | [
[
"Moxon",
"Jordan",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | We present several improvements to the Cauchy-characteristic evolution procedure that generates high-fidelity gravitational waveforms at $\mathcal{I}^+$ from numerical relativity simulations. Cauchy-characteristic evolution combines an interior solution of the Einstein field equations based on Cauchy slices with an ext... |
0706.1294 | Gamal Nashed G.L. | Gamal Gergess Lamee Nashed | Comments Brane-World Black Holes and Energy-Momentum Vector | 2 Pages Latex, This is a comments on the paper "arXiv:gr-qc/0611014" | null | null | null | gr-qc | null | We show that the energy distribution of the brane-world black holes given by
Salti et al. in the context of teleparallel theory is not right. We give the
correct formula of energy of those black hole.
| [
{
"created": "Sat, 9 Jun 2007 08:49:47 GMT",
"version": "v1"
}
] | 2007-06-12 | [
[
"Nashed",
"Gamal Gergess Lamee",
""
]
] | We show that the energy distribution of the brane-world black holes given by Salti et al. in the context of teleparallel theory is not right. We give the correct formula of energy of those black hole. |
1210.3808 | David McNutt | David McNutt | Spacetimes with all scalar curvature invariants in terms of the
Cosmological Constant | 9 pages | Int. J. Mod. Phys. D, 22, 1350003, 2013 | 10.1142/S021827181350003X | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we provide an invariant characterization for all spacetimes
with all polynomial scalar invariants constructed from the Riemann tensor and
its covariant derivatives vanishing except those zeroth order curvature
invariants expressed as polynomials in $\Lambda$, the cosmological constant.
Using this invar... | [
{
"created": "Sun, 14 Oct 2012 16:20:35 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2012 18:40:04 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Nov 2012 20:38:38 GMT",
"version": "v3"
}
] | 2013-03-01 | [
[
"McNutt",
"David",
""
]
] | In this letter we provide an invariant characterization for all spacetimes with all polynomial scalar invariants constructed from the Riemann tensor and its covariant derivatives vanishing except those zeroth order curvature invariants expressed as polynomials in $\Lambda$, the cosmological constant. Using this invaria... |
1406.0579 | Miguel Campiglia | Miguel Campiglia and Madhavan Varadarajan | The Koslowski-Sahlmann representation: Quantum Configuration Space | null | Class.Quant.Grav. 31 (2014) 175009 | 10.1088/0264-9381/31/17/175009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Koslowski-Sahlmann (KS) representation is a generalization of the
representation underlying the discrete spatial geometry of Loop Quantum Gravity
(LQG), to accommodate states labelled by smooth spatial geometries. As shown
recently, the KS representation supports, in addition to the action of the
holonomy and flu... | [
{
"created": "Tue, 3 Jun 2014 05:43:04 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Campiglia",
"Miguel",
""
],
[
"Varadarajan",
"Madhavan",
""
]
] | The Koslowski-Sahlmann (KS) representation is a generalization of the representation underlying the discrete spatial geometry of Loop Quantum Gravity (LQG), to accommodate states labelled by smooth spatial geometries. As shown recently, the KS representation supports, in addition to the action of the holonomy and flux ... |
1405.3620 | Damon Civin | Damon Civin | Quantitative mode stability for the wave equation on the Kerr-Newman
spacetime | 12 pages | null | null | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantitative versions of mode stability type statements for the wave equation
on Kerr-Newman black holes are proven for the full sub-extremal range. The mode
stability result on the real axis is then applied to prove integrated local
energy decay for solutions restricted to a bounded frequency regime. This is an
impo... | [
{
"created": "Wed, 14 May 2014 18:52:40 GMT",
"version": "v1"
}
] | 2014-05-15 | [
[
"Civin",
"Damon",
""
]
] | Quantitative versions of mode stability type statements for the wave equation on Kerr-Newman black holes are proven for the full sub-extremal range. The mode stability result on the real axis is then applied to prove integrated local energy decay for solutions restricted to a bounded frequency regime. This is an import... |
1503.08358 | Cesar S. Lopez-Monsalvo | A. Bravetti, C. S. Lopez-Monsalvo and H. Quevedo | Maximally Symmetric Spacetimes emerging from thermodynamic fluctuations | Preliminary version. Comments are welcome! Corrected equation
referencing | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we prove that the maximally symmetric vacuum solutions of
General Relativity emerge from the geometric structure of statistical mechanics
and thermodynamic fluctuation theory. To present our argument, we begin by
showing that the pseudo-Riemannian structure of the Thermodynamic Phase Space
is a solution ... | [
{
"created": "Sat, 28 Mar 2015 22:11:06 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2015 19:47:53 GMT",
"version": "v2"
}
] | 2015-04-01 | [
[
"Bravetti",
"A.",
""
],
[
"Lopez-Monsalvo",
"C. S.",
""
],
[
"Quevedo",
"H.",
""
]
] | In this work we prove that the maximally symmetric vacuum solutions of General Relativity emerge from the geometric structure of statistical mechanics and thermodynamic fluctuation theory. To present our argument, we begin by showing that the pseudo-Riemannian structure of the Thermodynamic Phase Space is a solution to... |
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