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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1902.09440 | Naimi Takka | Naimi Takka and Ahmed Bouda | Exact form of Maxwell's equations and Dirac's magnetic monopole in
Fock's nonlinear relativity | 18 pages, 0 figures | Mod. Phys. Lett. A 33 (2018) 1850173 | 10.1142/S0217732318501730 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After having obtained previously an extended first approximation of Maxwell's
equations in Fock's nonlinear relativity, we propose here the corresponding
exact form. In order to achieve this goal, we were inspired mainly by the
special relativistic version of Feynman's proof from which we constructed a
formal approac... | [
{
"created": "Mon, 25 Feb 2019 17:05:10 GMT",
"version": "v1"
}
] | 2019-02-26 | [
[
"Takka",
"Naimi",
""
],
[
"Bouda",
"Ahmed",
""
]
] | After having obtained previously an extended first approximation of Maxwell's equations in Fock's nonlinear relativity, we propose here the corresponding exact form. In order to achieve this goal, we were inspired mainly by the special relativistic version of Feynman's proof from which we constructed a formal approach ... |
2405.04924 | Sandro Wimberger | Nico Schwersenz, Victor Loaiza, Tim Zimmermann, Javier Madro\~nero,
Sandro Wimberger | Comparison of two different integration methods for the
(1+1)-Dimensional Schr\"odinger-Poisson Equation | Converged 1D solutions of Schr\"odinger-Poisson model including
spatial expansion, comparison between various methods and optimisation of
integrators | Comp. Phys. Comm. 300, 109192 (2024) | 10.1016/j.cpc.2024.109192 | null | gr-qc cond-mat.quant-gas physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | We compare two different numerical methods to integrate in time spatially
delocalized initial densities using the Schr\"odinger-Poisson equation system
as the evolution law. The basic equation is a nonlinear Schr\"odinger equation
with an auto-gravitating potential created by the wave function density itself.
The lat... | [
{
"created": "Wed, 8 May 2024 09:46:25 GMT",
"version": "v1"
},
{
"created": "Thu, 9 May 2024 16:23:24 GMT",
"version": "v2"
}
] | 2024-05-10 | [
[
"Schwersenz",
"Nico",
""
],
[
"Loaiza",
"Victor",
""
],
[
"Zimmermann",
"Tim",
""
],
[
"Madroñero",
"Javier",
""
],
[
"Wimberger",
"Sandro",
""
]
] | We compare two different numerical methods to integrate in time spatially delocalized initial densities using the Schr\"odinger-Poisson equation system as the evolution law. The basic equation is a nonlinear Schr\"odinger equation with an auto-gravitating potential created by the wave function density itself. The latte... |
0810.3741 | Todd Oliynyk | H.P. Kunzle and Todd A. Oliynyk | Spherical symmetry of generalized EYMH fields | May differ slightly from the published version | J.Geom.Phys.56:1856-1874,2006 | 10.1016/j.geomphys.2005.10.011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible actions of symmetry groups on generalized Higgs fields coupled
to an Einstein-Yang-Mills field are studied with differential geometrical
techniques involving principal and associated bundles. A classification of
conjugacy classes of these actions and the form of the corresponding invariant
Einstein-Yang-... | [
{
"created": "Tue, 21 Oct 2008 03:50:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kunzle",
"H. P.",
""
],
[
"Oliynyk",
"Todd A.",
""
]
] | The possible actions of symmetry groups on generalized Higgs fields coupled to an Einstein-Yang-Mills field are studied with differential geometrical techniques involving principal and associated bundles. A classification of conjugacy classes of these actions and the form of the corresponding invariant Einstein-Yang-Mi... |
2112.01497 | Sunil Maurya DR. | S. K. Maurya, Riju Nag | Role of gravitational decoupling on isotropization and complexity of
self-gravitating system under complete geometric deformation approach | 5 | null | 10.1140/epjc/s10052-021-09972-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the present paper, we discuss the role of gravitational decoupling to
isotropize the anisotropic solution of Einstein's field equations in the
context of the complete geometric deformation (CGD) approach and its influence
on the complexity factor introduced by L. Herrera (Phys. Rev. D 97, 044010
(2018)) in the sta... | [
{
"created": "Wed, 1 Dec 2021 18:46:39 GMT",
"version": "v1"
}
] | 2022-02-09 | [
[
"Maurya",
"S. K.",
""
],
[
"Nag",
"Riju",
""
]
] | In the present paper, we discuss the role of gravitational decoupling to isotropize the anisotropic solution of Einstein's field equations in the context of the complete geometric deformation (CGD) approach and its influence on the complexity factor introduced by L. Herrera (Phys. Rev. D 97, 044010 (2018)) in the stati... |
1811.06836 | Szymon Sikora | Szymon Sikora and Krzysztof G{\l}\'od | Perturbatively constructed cosmological model with periodically
distributed dust inhomogeneities | null | Phys. Rev. D 99, 083521 (2019) | 10.1103/PhysRevD.99.083521 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constructed a simple cosmological model which approximates the Einstein-de
Sitter background with periodically distributed dust inhomogeneities. By taking
the metric as a power series up to the third order in some perturbative
parameter $\lambda$, we are able to achieve large values of the density
contrast. With a... | [
{
"created": "Tue, 13 Nov 2018 21:49:59 GMT",
"version": "v1"
}
] | 2019-05-01 | [
[
"Sikora",
"Szymon",
""
],
[
"Głód",
"Krzysztof",
""
]
] | We constructed a simple cosmological model which approximates the Einstein-de Sitter background with periodically distributed dust inhomogeneities. By taking the metric as a power series up to the third order in some perturbative parameter $\lambda$, we are able to achieve large values of the density contrast. With a m... |
gr-qc/0509058 | Sergey Vyatchanin | V. B. Braginsky (1), O.G.Ryazhskaya (2) and S. P. Vyatchanin (1), ((1)
Moscow State University, (2) Inst. for Nuclear Research, Moscow) | Notes about Noise in Gravitational Wave Antennas Created by Cosmic Rays | 9 pages, LaTex | Phys.Lett.A350:1-4,2006 | 10.1016/j.physleta.2005.09.073 | null | gr-qc | null | Thermodynamical fluctuations of temperature in mirrors may produce surface
fluctuations not only through thermal expansion in mirror body but also through
thermal expansion in mirror coating. We analyze the last "surface" effect which
can be larger than the first "volume" one due to larger thermal expansion
coefficie... | [
{
"created": "Thu, 15 Sep 2005 08:43:15 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Braginsky",
"V. B.",
""
],
[
"Ryazhskaya",
"O. G.",
""
],
[
"Vyatchanin",
"S. P.",
""
]
] | Thermodynamical fluctuations of temperature in mirrors may produce surface fluctuations not only through thermal expansion in mirror body but also through thermal expansion in mirror coating. We analyze the last "surface" effect which can be larger than the first "volume" one due to larger thermal expansion coefficient... |
2103.03855 | Alexander Zhidenko | R. A. Konoplya, A. Zhidenko | Shadows of parametrized axially symmetric black holes allowing for
separation of variables | 9 pages, 7 figures | Phys. Rev. D 103, 104033 (2021) | 10.1103/PhysRevD.103.104033 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Metric of axially symmetric asymptotically flat black holes in an arbitrary
metric theory of gravity can be represented in the general form which depends
on infinite number of parameters. We constrain this general class of metrics by
requiring the existence of additional symmetries, which lead to the separation
of va... | [
{
"created": "Fri, 5 Mar 2021 18:13:55 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Mar 2021 17:53:34 GMT",
"version": "v2"
},
{
"created": "Mon, 17 May 2021 20:26:45 GMT",
"version": "v3"
}
] | 2021-05-20 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | Metric of axially symmetric asymptotically flat black holes in an arbitrary metric theory of gravity can be represented in the general form which depends on infinite number of parameters. We constrain this general class of metrics by requiring the existence of additional symmetries, which lead to the separation of vari... |
gr-qc/0402063 | Scott A. Hughes | Nathan A. Collins and Scott A. Hughes | Towards a formalism for mapping the spacetimes of massive compact
objects: Bumpy black holes and their orbits | 16 pages + 2 appendices + 3 figures. Submitted to PRD | Phys.Rev. D69 (2004) 124022 | 10.1103/PhysRevD.69.124022 | null | gr-qc astro-ph | null | Observations have established that extremely compact, massive objects are
common in the universe. It is generally accepted that these objects are black
holes. As observations improve, it becomes possible to test this hypothesis in
ever greater detail. In particular, it is or will be possible to measure the
properties... | [
{
"created": "Fri, 13 Feb 2004 18:19:19 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Feb 2004 01:38:20 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Collins",
"Nathan A.",
""
],
[
"Hughes",
"Scott A.",
""
]
] | Observations have established that extremely compact, massive objects are common in the universe. It is generally accepted that these objects are black holes. As observations improve, it becomes possible to test this hypothesis in ever greater detail. In particular, it is or will be possible to measure the properties o... |
gr-qc/9404065 | Sean Carroll | Sean M. Carroll, Edward Farhi, Alan H. Guth, and Ken D. Olum | Energy-Momentum Restrictions on the Creation of Gott Time Machines | Plain TeX, 41 pages incl. 9 figures. MIT-CTP #2252 | Phys.Rev. D50 (1994) 6190-6206 | 10.1103/PhysRevD.50.6190 | null | gr-qc hep-th | null | The discovery by Gott of a remarkably simple spacetime with closed timelike
curves (CTC's) provides a tool for investigating how the creation of time
machines is prevented in classical general relativity. The Gott spacetime
contains two infinitely long, parallel cosmic strings, which can equivalently
be viewed as poi... | [
{
"created": "Sun, 1 May 1994 20:35:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Carroll",
"Sean M.",
""
],
[
"Farhi",
"Edward",
""
],
[
"Guth",
"Alan H.",
""
],
[
"Olum",
"Ken D.",
""
]
] | The discovery by Gott of a remarkably simple spacetime with closed timelike curves (CTC's) provides a tool for investigating how the creation of time machines is prevented in classical general relativity. The Gott spacetime contains two infinitely long, parallel cosmic strings, which can equivalently be viewed as point... |
2402.17026 | Panagiotis Mavrogiannis | Panagiotis Mavrogiannis | Aspects of the Einstein-Maxwell-Weyl coupling | 151 pages, 1 figure, pre-submission thesis draft. arXiv admin note:
text overlap with arXiv:2104.06848 | null | null | null | gr-qc physics.class-ph | http://creativecommons.org/licenses/by/4.0/ | Interesting phenomena and problems arising from the coupling of large-scale
electromagnetic fields and spacetime curvature, are introduced and studied
within this thesis. From electromagnetic wave propagation in curved spacetime
to envisaging a gravito-electromagnetic equivalence on large scales; from
magnetic fields... | [
{
"created": "Mon, 26 Feb 2024 21:08:48 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Mar 2024 17:22:49 GMT",
"version": "v2"
}
] | 2024-03-05 | [
[
"Mavrogiannis",
"Panagiotis",
""
]
] | Interesting phenomena and problems arising from the coupling of large-scale electromagnetic fields and spacetime curvature, are introduced and studied within this thesis. From electromagnetic wave propagation in curved spacetime to envisaging a gravito-electromagnetic equivalence on large scales; from magnetic fields' ... |
1903.08119 | Daniela Doneva | Daniela D. Doneva, Kalin V. Staykov, Stoytcho S. Yazadjiev | Gauss-Bonnet black holes with a massive scalar field | 15 pages, 13 figures; v2 improved version, references added | Phys. Rev. D 99, 104045 (2019) | 10.1103/PhysRevD.99.104045 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we consider the extended scalar-tensor-Gauss-Bonnet
gravity with a massive scalar field. We prove numerically the existence of
Gauss-Bonnet black holes for three different forms of the coupling function
including the case of spontaneous scalarization. We have performed a systematic
study of the b... | [
{
"created": "Tue, 19 Mar 2019 17:21:51 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2019 14:48:32 GMT",
"version": "v2"
}
] | 2019-05-29 | [
[
"Doneva",
"Daniela D.",
""
],
[
"Staykov",
"Kalin V.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | In the present paper we consider the extended scalar-tensor-Gauss-Bonnet gravity with a massive scalar field. We prove numerically the existence of Gauss-Bonnet black holes for three different forms of the coupling function including the case of spontaneous scalarization. We have performed a systematic study of the bla... |
1404.6023 | P. A. Gonzalez | Ram\'on Becar, P. A. Gonz\'alez and Yerko V\'asquez | Fermionic greybody factors of two and five-dimensional dilatonic black
holes | Accepted in EPJC | null | 10.1140/epjc/s10052-014-3028-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study fermionic perturbations in the background of a two and
five-dimensional dilatonic black holes. Then, we compute the reflection and
transmission coefficients and the absorption cross section for fermionic
fields, and we show numerically that the absorption cross section vanishes in
the low and high frequency ... | [
{
"created": "Thu, 24 Apr 2014 04:34:34 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Aug 2014 03:53:14 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Becar",
"Ramón",
""
],
[
"González",
"P. A.",
""
],
[
"Vásquez",
"Yerko",
""
]
] | We study fermionic perturbations in the background of a two and five-dimensional dilatonic black holes. Then, we compute the reflection and transmission coefficients and the absorption cross section for fermionic fields, and we show numerically that the absorption cross section vanishes in the low and high frequency li... |
gr-qc/0604004 | P Ajith | P Ajith, M Hewitson, and I S Heng | Null-stream veto for two co-located detectors: Implementation issues | Minor changes; To appear in Class. Quantum Grav. (Proc. GWDAW10) | Class.Quant.Grav.23:S741-S749,2006 | 10.1088/0264-9381/23/19/S13 | AEI-2006-019 | gr-qc | null | Time-series data from multiple gravitational wave (GW) detectors can be
linearly combined to form a null-stream, in which all GW information will be
cancelled out. This null-stream can be used to distinguish between actual GW
triggers and spurious noise transients in a search for GW bursts using a
network of detector... | [
{
"created": "Sat, 1 Apr 2006 16:33:25 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2006 13:44:06 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Ajith",
"P",
""
],
[
"Hewitson",
"M",
""
],
[
"Heng",
"I S",
""
]
] | Time-series data from multiple gravitational wave (GW) detectors can be linearly combined to form a null-stream, in which all GW information will be cancelled out. This null-stream can be used to distinguish between actual GW triggers and spurious noise transients in a search for GW bursts using a network of detectors.... |
1407.6187 | Mehrdad Farhoudi Prof. | Hamid Shabani and Mehrdad Farhoudi | Cosmological and Solar System Consequences of f(R,T) Gravity Models | a few changes done | Phys. Rev. D 90 (2014), 044031 | 10.1103/PhysRevD.90.044031 | null | gr-qc astro-ph.CO astro-ph.SR hep-th physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To find more deliberate f(R,T) cosmological solutions, we proceed our
previous paper further by studying some new aspects of the considered models
via investigation of some new cosmological parameters/quantities to attain the
most acceptable cosmological results. Our investigations are performed by
applying the dynam... | [
{
"created": "Wed, 23 Jul 2014 12:05:38 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2014 06:50:06 GMT",
"version": "v2"
}
] | 2017-05-23 | [
[
"Shabani",
"Hamid",
""
],
[
"Farhoudi",
"Mehrdad",
""
]
] | To find more deliberate f(R,T) cosmological solutions, we proceed our previous paper further by studying some new aspects of the considered models via investigation of some new cosmological parameters/quantities to attain the most acceptable cosmological results. Our investigations are performed by applying the dynamic... |
2310.20531 | Haidar Sheikhahmadi | Haidar Sheikhahmadi | Force Free Magnetic Field and Modifications in Kerr Black Hole | 11 pages | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | A recent research presented a solution for a Schwarzschild black hole with a
force-free magnetic field showing how the canonical form of background metric
changes, Found. Phys. 52 (2022) 4, 93. Therefore, it is logical that this
research seeks modified solutions for the Kerr black hole as well. The goal of
this paper... | [
{
"created": "Tue, 31 Oct 2023 15:14:53 GMT",
"version": "v1"
}
] | 2023-11-01 | [
[
"Sheikhahmadi",
"Haidar",
""
]
] | A recent research presented a solution for a Schwarzschild black hole with a force-free magnetic field showing how the canonical form of background metric changes, Found. Phys. 52 (2022) 4, 93. Therefore, it is logical that this research seeks modified solutions for the Kerr black hole as well. The goal of this paper i... |
2312.14391 | Dan-Dan Lian | Dan-Dan Lian and Peng-Ming Zhang | The motion of twisted particles in a stellar gravitational field | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A twisted particle possesses intrinsic orbital angular momentum (OAM), and
the dynamics of such a particle may challenge the Einstein Equivalence
Principle. In this study, we disregard the spin characteristic of the twisted
particle, modeling it as a massless complex twisted scalar wave packet to
simplify its interac... | [
{
"created": "Fri, 22 Dec 2023 02:38:20 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jan 2024 15:25:01 GMT",
"version": "v2"
}
] | 2024-01-09 | [
[
"Lian",
"Dan-Dan",
""
],
[
"Zhang",
"Peng-Ming",
""
]
] | A twisted particle possesses intrinsic orbital angular momentum (OAM), and the dynamics of such a particle may challenge the Einstein Equivalence Principle. In this study, we disregard the spin characteristic of the twisted particle, modeling it as a massless complex twisted scalar wave packet to simplify its interacti... |
1408.5483 | Andrea Geralico | Donato Bini, Andrea Geralico, Daniele Gregoris, Sauro Succi | Dark energy from cosmological fluids obeying a Shan-Chen non-ideal
equation of state | 12 pages, 9 figures; published version | Phys. Rev. D 88, 063007 (2013) | 10.1103/PhysRevD.88.063007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a Friedmann-Robertson-Walker universe with a fluid source obeying
a non-ideal equation of state with "asymptotic freedom," namely ideal gas
behavior (pressure changes directly proportional to density changes) both at
low and high density regimes, following a fluid dynamical model due to Shan and
Chen. It ... | [
{
"created": "Sat, 23 Aug 2014 10:29:00 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Gregoris",
"Daniele",
""
],
[
"Succi",
"Sauro",
""
]
] | We consider a Friedmann-Robertson-Walker universe with a fluid source obeying a non-ideal equation of state with "asymptotic freedom," namely ideal gas behavior (pressure changes directly proportional to density changes) both at low and high density regimes, following a fluid dynamical model due to Shan and Chen. It is... |
1907.03621 | Remo Garattini | Remo Garattini | Black Hole Thermodynamics and Gravity's Rainbow | 6 pages. Contribution to the proceedings of "The Fifteenth Marcel
Grossmann Meeting on General Relativity", University of Rome "La Sapienza",
Rome, July 1-7, 2018, based on a talk delivered at the BH5 parallel session | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the effects of rotations on the calculation of some
thermodynamical quantities like the free energy, internal energy and entropy.
In ordinary gravity, when we evaluate the density of states of a scalar field
close to a black hole horizon, we obtain a divergent result which can be kept
under control with t... | [
{
"created": "Fri, 5 Jul 2019 15:16:19 GMT",
"version": "v1"
}
] | 2019-07-09 | [
[
"Garattini",
"Remo",
""
]
] | We consider the effects of rotations on the calculation of some thermodynamical quantities like the free energy, internal energy and entropy. In ordinary gravity, when we evaluate the density of states of a scalar field close to a black hole horizon, we obtain a divergent result which can be kept under control with the... |
1005.4449 | James Lindesay | James Lindesay and Paul Sheldon | Penrose Diagram for a Transient Black Hole | 14 pages, 9 figures, spelling corrections | Class.Quant.Grav.27:215015,2010 | 10.1088/0264-9381/27/21/215015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Penrose diagram is constructed for a spatially coherent black hole that
smoothly begins an accretion, then excretes symmetrically as measured by a
distant observer, with the initial and final states described by a metric of
Minkowski form. Coordinate curves on the diagram are computationally derived.
Causal relatio... | [
{
"created": "Mon, 24 May 2010 22:57:32 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2010 14:48:00 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Lindesay",
"James",
""
],
[
"Sheldon",
"Paul",
""
]
] | A Penrose diagram is constructed for a spatially coherent black hole that smoothly begins an accretion, then excretes symmetrically as measured by a distant observer, with the initial and final states described by a metric of Minkowski form. Coordinate curves on the diagram are computationally derived. Causal relations... |
1603.02837 | Leonardo Fernandez-Jambrina | L. Fern\'andez-Jambrina | Behavior of Friedmann-Lemaitre-Robertson-Walker Singularities | Accepted in International Journal of Theoretical Physics | null | 10.1007/s10773-016-2980-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A regularization procedure has been recently suggested for regularizing Big
Bang singularities in Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetimes. We
argue that this procedure is only appliable to one case of Big Bang
singularities and does not affect other types of singularities.
| [
{
"created": "Wed, 9 Mar 2016 10:42:56 GMT",
"version": "v1"
}
] | 2016-03-22 | [
[
"Fernández-Jambrina",
"L.",
""
]
] | A regularization procedure has been recently suggested for regularizing Big Bang singularities in Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetimes. We argue that this procedure is only appliable to one case of Big Bang singularities and does not affect other types of singularities. |
2110.15342 | Giuseppe Gaetano Luciano | Jaume Gin\'e and Giuseppe Gaetano Luciano | Gravitational effects on the Heisenberg Uncertainty Principle: a
geometric approach | 9 Pages, 1 Figure | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The Heisenberg Uncertainty Principle (HUP) limits the accuracy in the
simultaneous measurements of the position and momentum variables of any quantum
system. This is known to be true in the context of non-relativistic quantum
mechanics. Based on a semiclassical geometric approach, here we propose an
effective general... | [
{
"created": "Thu, 28 Oct 2021 17:51:41 GMT",
"version": "v1"
}
] | 2021-10-29 | [
[
"Giné",
"Jaume",
""
],
[
"Luciano",
"Giuseppe Gaetano",
""
]
] | The Heisenberg Uncertainty Principle (HUP) limits the accuracy in the simultaneous measurements of the position and momentum variables of any quantum system. This is known to be true in the context of non-relativistic quantum mechanics. Based on a semiclassical geometric approach, here we propose an effective generaliz... |
1512.01494 | Petya Nedkova | Christian Knoll, Petya Nedkova | Charged rotating dilaton black holes with Kaluza-Klein asymptotics | 29 pages, 3 figures | Phys. Rev. D 93, 064052 (2016) | 10.1103/PhysRevD.93.064052 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a class of stationary and axisymmetric solutions to the 5D
Einstein-Maxwell-dilaton gravity, which describe configurations of charged
rotating black objects with Kaluza-Klein asymptotics. The solutions are
constructed by uplifting a vacuum seed solution to six dimensions, performing a
boost, and a subseq... | [
{
"created": "Fri, 4 Dec 2015 17:43:35 GMT",
"version": "v1"
}
] | 2016-03-30 | [
[
"Knoll",
"Christian",
""
],
[
"Nedkova",
"Petya",
""
]
] | We construct a class of stationary and axisymmetric solutions to the 5D Einstein-Maxwell-dilaton gravity, which describe configurations of charged rotating black objects with Kaluza-Klein asymptotics. The solutions are constructed by uplifting a vacuum seed solution to six dimensions, performing a boost, and a subseque... |
2312.16198 | Chris Jia | Chris Jia | Gravitational Waves Through Time: Scientific Significance, Detection
Techniques, and Recent Breakthroughs | 10 pages, 8 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This article, produced as part of an undergraduate research class, aims to
provide an overview of gravitational waves, though it does not offer a
comprehensive review. We begin with a brief discussion regarding the history of
gravitational waves, beginning even before Albert Einstein's theory of general
relativity, h... | [
{
"created": "Sat, 23 Dec 2023 03:03:56 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2024 18:36:34 GMT",
"version": "v2"
}
] | 2024-06-18 | [
[
"Jia",
"Chris",
""
]
] | This article, produced as part of an undergraduate research class, aims to provide an overview of gravitational waves, though it does not offer a comprehensive review. We begin with a brief discussion regarding the history of gravitational waves, beginning even before Albert Einstein's theory of general relativity, hig... |
gr-qc/0510005 | Mark D. Roberts | Mark D. Roberts | The Kasner Brane | now 11 pages was 10 pages, v3 12 november 2009 section added on
matter trapping v2 26oct09 - sections added on double kasner and brane fluid | null | 10.1142/S0217732315501850 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solutions are found to field equations constructed from the
Pauli, Bach and Gauss-Bonnet quadratic tensors to the Kasner and Kasner brane
spacetimes in up to five dimensions. A double Kasner space is shown to have a
vacuum solution. Brane solutions in which the bulk components of the Einstein
tensor vanish are also... | [
{
"created": "Sun, 2 Oct 2005 16:34:18 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Oct 2009 15:52:00 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Nov 2009 17:19:58 GMT",
"version": "v3"
}
] | 2015-12-04 | [
[
"Roberts",
"Mark D.",
""
]
] | Solutions are found to field equations constructed from the Pauli, Bach and Gauss-Bonnet quadratic tensors to the Kasner and Kasner brane spacetimes in up to five dimensions. A double Kasner space is shown to have a vacuum solution. Brane solutions in which the bulk components of the Einstein tensor vanish are also loo... |
gr-qc/0011045 | Sawa Manoff | S. Manoff, B. Dimitrov | Weyl's spaces with shear-free and expansion-free conformal Killing
vectors and the motion of a free spinless test particle | 21 pages, LaTeX. The title is squeezed. Some typos and explanations
are removed. New references are added and all references are written in the
form required by Classical and Quantum Gravity | null | null | null | gr-qc | null | Conditions for the existence of shear-free and expansion-free non-null vector
fields in spaces with affine connections and metrics are found. On their basis
Weyl's spaces with shear-free and expansion-free conformal Killing vectors are
considered. The necessary and sufficient conditions are found under which a
free s... | [
{
"created": "Mon, 13 Nov 2000 13:48:52 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2000 08:30:38 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Manoff",
"S.",
""
],
[
"Dimitrov",
"B.",
""
]
] | Conditions for the existence of shear-free and expansion-free non-null vector fields in spaces with affine connections and metrics are found. On their basis Weyl's spaces with shear-free and expansion-free conformal Killing vectors are considered. The necessary and sufficient conditions are found under which a free spi... |
1606.04260 | Sergey Yu. Vernov | A.Yu. Kamenshchik, E.O. Pozdeeva, A. Tronconi, G. Venturi, S.Yu.
Vernov | Integrable cosmological models in the Einstein and in the Jordan frames
and Bianchi-I cosmology | 6 pages, v2: minor corrections, references added | Phys. Part. Nuclei 49 (2018) 1 | 10.1134/S1063779618010173 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study integrable models in the Bianchi I metric case with scalar fields
minimally and non-minimally coupled with gravity and the correspondence between
their general solutions. Using the model with a minimally coupled scalar field
and a constant potential as an example, we demonstrate how to obtain the
general sol... | [
{
"created": "Tue, 14 Jun 2016 09:00:16 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Aug 2016 19:04:24 GMT",
"version": "v2"
}
] | 2018-01-26 | [
[
"Kamenshchik",
"A. Yu.",
""
],
[
"Pozdeeva",
"E. O.",
""
],
[
"Tronconi",
"A.",
""
],
[
"Venturi",
"G.",
""
],
[
"Vernov",
"S. Yu.",
""
]
] | We study integrable models in the Bianchi I metric case with scalar fields minimally and non-minimally coupled with gravity and the correspondence between their general solutions. Using the model with a minimally coupled scalar field and a constant potential as an example, we demonstrate how to obtain the general solut... |
2104.08449 | Nomaan X | Abhishek Mathur, Sumati Surya and Nomaan X | A Spacetime Calculation of the Calabrese-Cardy Entanglement Entropy | 13 pages, 9 figures | Physics Letters B. 2021 Aug 8:136567 | 10.1016/j.physletb.2021.136567 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate Sorkin's spacetime entanglement entropy of a Gaussian scalar
field for complementary regions in the 2d cylinder spacetime and show that it
has the Calabrese-Cardy form. We find that the cut-off dependent term is
universal when we use a covariant UV cut-off. In addition, we show that the
relative size-dep... | [
{
"created": "Sat, 17 Apr 2021 04:59:41 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Aug 2021 07:31:00 GMT",
"version": "v2"
}
] | 2021-08-24 | [
[
"Mathur",
"Abhishek",
""
],
[
"Surya",
"Sumati",
""
],
[
"X",
"Nomaan",
""
]
] | We calculate Sorkin's spacetime entanglement entropy of a Gaussian scalar field for complementary regions in the 2d cylinder spacetime and show that it has the Calabrese-Cardy form. We find that the cut-off dependent term is universal when we use a covariant UV cut-off. In addition, we show that the relative size-depen... |
2011.06297 | Andrea Orizzonte | Salvatore Capozziello, Alice Chiappini, Lorenzo Fatibene and Andrea
Orizzonte | The generally covariant meaning of space distances | 12 pages, 4 figures | null | 10.1140/epjp/s13360-020-00968-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a covariant and geometric framework to introduce space distances
as they are used by astronomers. In particular, we extend the definition of
space distances from the one used between events to non-test-bodies with
horizons and singularities so that the definition extends through the horizons
and it matches... | [
{
"created": "Thu, 12 Nov 2020 10:16:07 GMT",
"version": "v1"
}
] | 2022-01-11 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Chiappini",
"Alice",
""
],
[
"Fatibene",
"Lorenzo",
""
],
[
"Orizzonte",
"Andrea",
""
]
] | We propose a covariant and geometric framework to introduce space distances as they are used by astronomers. In particular, we extend the definition of space distances from the one used between events to non-test-bodies with horizons and singularities so that the definition extends through the horizons and it matches t... |
gr-qc/9906105 | Hans Kastrup | M. Bojowald, H.A. Kastrup, F. Schramm, T. Strobl (RWTH Aachen,
Germany) | Group Theoretical Quantization of a Phase Space S^1 x R^+ and the Mass
Spectrum of Schwarzschild Black Holes in D Space-Time Dimensions | 45 pages, Latex; version accepted for publication in Phys. Rev. D
(Refs. added, small changes in the introduction, no changes of results) | Phys.Rev. D62 (2000) 044026 | 10.1103/PhysRevD.62.044026 | PITHA 99/19 | gr-qc hep-th quant-ph | null | The symplectic reduction of pure spherically symmetric (Schwarzschild)
classical gravity in D space-time dimensions yields a 2-dimensional phase space
of observables consisting of the Mass M (>0) and a canonically conjugate
(Killing) time variable T. Imposing (mass-dependent) periodic boundary
conditions in time on t... | [
{
"created": "Thu, 24 Jun 1999 18:12:15 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Aug 1999 15:25:41 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Apr 2000 12:58:34 GMT",
"version": "v3"
}
] | 2016-08-31 | [
[
"Bojowald",
"M.",
"",
"RWTH Aachen,\n Germany"
],
[
"Kastrup",
"H. A.",
"",
"RWTH Aachen,\n Germany"
],
[
"Schramm",
"F.",
"",
"RWTH Aachen,\n Germany"
],
[
"Strobl",
"T.",
"",
"RWTH Aachen,\n Germany"
]
] | The symplectic reduction of pure spherically symmetric (Schwarzschild) classical gravity in D space-time dimensions yields a 2-dimensional phase space of observables consisting of the Mass M (>0) and a canonically conjugate (Killing) time variable T. Imposing (mass-dependent) periodic boundary conditions in time on the... |
1001.5161 | Ian Hinder | Ian Hinder | The Current Status of Binary Black Hole Simulations in Numerical
Relativity | 14 pages; minor changes and corrections in response to referees | Class.Quant.Grav.27:114004,2010 | 10.1088/0264-9381/27/11/114004 | AEI-2010-008 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the breakthroughs in 2005 which have led to long term stable solutions
of the binary black hole problem in numerical relativity, much progress has
been made. I present here a short summary of the state of the field, including
the capabilities of numerical relativity codes, recent physical results
obtained from ... | [
{
"created": "Thu, 28 Jan 2010 15:58:16 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jun 2010 14:40:17 GMT",
"version": "v2"
}
] | 2010-10-28 | [
[
"Hinder",
"Ian",
""
]
] | Since the breakthroughs in 2005 which have led to long term stable solutions of the binary black hole problem in numerical relativity, much progress has been made. I present here a short summary of the state of the field, including the capabilities of numerical relativity codes, recent physical results obtained from si... |
gr-qc/0411042 | Stefano Ansoldi | Stefano Ansoldi and Lorenzo Sindoni | Gravitational Tunnelling of Relativistic Shells | 5 pages, 3 EPS figures, to appear in the proceddings of the 6th
International Symposium on Frontiers in Fundamental and Computational Physics
(FFP6), September 26-29, Udine, ITALY | null | null | null | gr-qc | null | Thin shells in general relativity have been used in the past as keystones to
obtain realistic models of cosmological and astrophysical situations. A crucial
role for these developments was played by the compact description of their
dynamics in terms of Israel's junction conditions. Starting from this
geometrical form... | [
{
"created": "Tue, 9 Nov 2004 13:05:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ansoldi",
"Stefano",
""
],
[
"Sindoni",
"Lorenzo",
""
]
] | Thin shells in general relativity have been used in the past as keystones to obtain realistic models of cosmological and astrophysical situations. A crucial role for these developments was played by the compact description of their dynamics in terms of Israel's junction conditions. Starting from this geometrical formul... |
1404.3092 | Megandhren Govender | M. Govender and S. Thirukkanesh | Causal heat flow in Bianchi type-V universe | 9 pages, 2 figures | Vol. 29, No. 13 (2014) 1450071 | 10.1142/S0217732314500710 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the role of causal heat transport in a spatially
homogeneous, locally-rotationally symmetric Bianchi type-V cosmological model.
In particular, the causal temperature profile of the cosmological fluid is
obtained within the framework of extended irreversible thermodynamics. We
demonstrate ... | [
{
"created": "Fri, 11 Apr 2014 12:37:20 GMT",
"version": "v1"
}
] | 2014-05-13 | [
[
"Govender",
"M.",
""
],
[
"Thirukkanesh",
"S.",
""
]
] | In this paper we investigate the role of causal heat transport in a spatially homogeneous, locally-rotationally symmetric Bianchi type-V cosmological model. In particular, the causal temperature profile of the cosmological fluid is obtained within the framework of extended irreversible thermodynamics. We demonstrate th... |
gr-qc/0009092 | Roberto Gomez | Roberto Gomez, Sascha Husa, and Jeffrey Winicour | Complete null data for a black hole collision | Revised version, to appear in Phys. Rev. D. July 15 (2001), 41 pages,
11 figures, RevTeX/epsf/psfig | Phys.Rev. D64 (2001) 024010 | 10.1103/PhysRevD.64.024010 | null | gr-qc | null | We present an algorithm for calculating the complete data on an event horizon
which constitute the necessary input for characteristic evolution of the
exterior spacetime. We apply this algorithm to study the intrinsic and
extrinsic geometry of a binary black hole event horizon, constructing a
sequence of binary black... | [
{
"created": "Tue, 26 Sep 2000 23:54:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jun 2001 20:57:34 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gomez",
"Roberto",
""
],
[
"Husa",
"Sascha",
""
],
[
"Winicour",
"Jeffrey",
""
]
] | We present an algorithm for calculating the complete data on an event horizon which constitute the necessary input for characteristic evolution of the exterior spacetime. We apply this algorithm to study the intrinsic and extrinsic geometry of a binary black hole event horizon, constructing a sequence of binary black h... |
1412.1958 | Jens Boos | Jens Boos | Pleba\'nski-Demia\'nski solution of general relativity and its
expressions quadratic and cubic in curvature: analogies to electromagnetism | 52 pages, 11 listings of computer algebra code; typos removed, and
journal reference added | Int. J. Mod. Phys. D 24 (2015) 1550079 (10) | 10.1142/S0218271815500790 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analogies between gravitation and electromagnetism have been known since the
1950s. Here, we examine a fairly general type D solution---the exact seven
parameter solution of Pleba\'nski--Demia\'nski (PD)---to demonstrate these
analogies for a physically meaningful spacetime: The two quadratic curvature
invariants $\b... | [
{
"created": "Fri, 5 Dec 2014 11:26:34 GMT",
"version": "v1"
},
{
"created": "Mon, 18 May 2015 19:00:19 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Jul 2015 07:41:05 GMT",
"version": "v3"
}
] | 2015-07-03 | [
[
"Boos",
"Jens",
""
]
] | Analogies between gravitation and electromagnetism have been known since the 1950s. Here, we examine a fairly general type D solution---the exact seven parameter solution of Pleba\'nski--Demia\'nski (PD)---to demonstrate these analogies for a physically meaningful spacetime: The two quadratic curvature invariants $\bf{... |
gr-qc/0204019 | T. Padmanabhan | T.Padmanabhan | Classical and Quantum Thermodynamics of horizons in spherically
symmetric spacetimes | 23 pages; arguments and interpretation sharpened; results
generalised; new Appendix B on the structure of Einstein-Hilbert action
added; accepted for publication in Class.Quan.Grav | Class.Quant.Grav.19:5387-5408,2002 | 10.1088/0264-9381/19/21/306 | null | gr-qc astro-ph hep-th | null | A general formalism for understanding the thermodynamics of horizons in
spherically symmetric spacetimes is developed. The formalism reproduces known
results in the case of black hole spacetimes. But its power lies in being able
to handle more general situations like: (i) spacetimes which are not
asymptotically flat ... | [
{
"created": "Thu, 4 Apr 2002 14:56:02 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2002 05:45:04 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Padmanabhan",
"T.",
""
]
] | A general formalism for understanding the thermodynamics of horizons in spherically symmetric spacetimes is developed. The formalism reproduces known results in the case of black hole spacetimes. But its power lies in being able to handle more general situations like: (i) spacetimes which are not asymptotically flat (l... |
2404.16912 | Naman Kumar | Naman Kumar | Recovering semiclassical Einstein's equation using generalized entropy | null | Gen Relativ Gravit 55, 127 (2023) | 10.1007/s10714-023-03172-x | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we show that the Semiclassical Einstein's Field Equation can
be recovered using the generalized entropy $S_{gen}$. This approach is
reminiscent of non-equilibrium thermodynamics. Furthermore, contrary to the
entanglement equilibrium approach of deriving the semiclassical Einstein's
equation, this appr... | [
{
"created": "Thu, 25 Apr 2024 14:22:34 GMT",
"version": "v1"
}
] | 2024-04-29 | [
[
"Kumar",
"Naman",
""
]
] | In this letter, we show that the Semiclassical Einstein's Field Equation can be recovered using the generalized entropy $S_{gen}$. This approach is reminiscent of non-equilibrium thermodynamics. Furthermore, contrary to the entanglement equilibrium approach of deriving the semiclassical Einstein's equation, this approa... |
0705.4507 | Joao Magueijo | Joao Magueijo and John W. Moffat | Comments on "Note on varying speed of light theories" | null | Gen.Rel.Grav.40:1797-1806,2008 | 10.1007/s10714-007-0568-2 | null | gr-qc astro-ph hep-ph | null | In a recent note Ellis criticizes varying speed of light theories on the
grounds of a number of foundational issues. His reflections provide us with an
opportunity to clarify some fundamental matters pertaining to these theories.
| [
{
"created": "Thu, 31 May 2007 03:18:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Magueijo",
"Joao",
""
],
[
"Moffat",
"John W.",
""
]
] | In a recent note Ellis criticizes varying speed of light theories on the grounds of a number of foundational issues. His reflections provide us with an opportunity to clarify some fundamental matters pertaining to these theories. |
gr-qc/0204055 | Marcelo J. Reboucas | M.J. Reboucas | Summary Talk on Cosmology and Gravitation: XXII Brazilian National
Meeting on Particles and Fields | 7 pages, RevTex. Invited talk. To appear in Braz. J. Phys. (2002) | Braz.J.Phys. 32 (2002) 908-915 | 10.1590/S0103-97332002000500015 | null | gr-qc astro-ph hep-th | null | The plenary lectures, parallel talks, oral presentations and panel
contributions on Cosmology and Gravitation presented during the XXII Brazilian
National Meeting on Particles and Fields are briefly reviewed. Some remarks on
the area are also presented.
| [
{
"created": "Wed, 17 Apr 2002 01:19:40 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Reboucas",
"M. J.",
""
]
] | The plenary lectures, parallel talks, oral presentations and panel contributions on Cosmology and Gravitation presented during the XXII Brazilian National Meeting on Particles and Fields are briefly reviewed. Some remarks on the area are also presented. |
1009.1803 | Marc Holman | M. Holman | Generalized Noether Theorems for Field Theories Formulated in Minkowski
Spacetime | 20 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New symmetry theorems are obtained for field theories formulated in Minkowski
spacetime, based on the recognition that such theories should be diffeomorphism
invariant. These theorems, which are in fact generalized Noether theorems, have
several nontrivial ramifications. One immediate consequence is the necessity to
... | [
{
"created": "Thu, 9 Sep 2010 15:03:58 GMT",
"version": "v1"
}
] | 2010-09-10 | [
[
"Holman",
"M.",
""
]
] | New symmetry theorems are obtained for field theories formulated in Minkowski spacetime, based on the recognition that such theories should be diffeomorphism invariant. These theorems, which are in fact generalized Noether theorems, have several nontrivial ramifications. One immediate consequence is the necessity to re... |
2202.12432 | Metin Arik | Metin Arik, Tarik Tok | Angular momentum in the internal SO(3) symmetry space relating the size
of universe and the Higgs mass | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that with an internal SO(3) symmetric triplet of Higgs fields, the
conserved quantity associated with this internal SO(3) symmetry leads to
spontaneous symmetry breaking giving the Higgs field a mass.
| [
{
"created": "Fri, 25 Feb 2022 00:06:14 GMT",
"version": "v1"
}
] | 2022-02-28 | [
[
"Arik",
"Metin",
""
],
[
"Tok",
"Tarik",
""
]
] | We show that with an internal SO(3) symmetric triplet of Higgs fields, the conserved quantity associated with this internal SO(3) symmetry leads to spontaneous symmetry breaking giving the Higgs field a mass. |
gr-qc/9904078 | Hrvoje Nikolic | H. Nikolic | Relativistic contraction and related effects in noninertial frames | 15 pages, significantly revised version, title changed, to appear in
Phys. Rev. A | Phys.Rev.A61:032109,2000 | 10.1103/PhysRevA.61.032109 | null | gr-qc physics.class-ph | null | Although there is no relative motion among different points on a rotating
disc, each point belongs to a different noninertial frame. This fact, not
recognized in previous approaches to the Ehrenfest paradox and related
problems, is exploited to give a correct treatment of a rotating ring and a
rotating disc. Tensile ... | [
{
"created": "Thu, 29 Apr 1999 13:51:56 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Nov 1999 16:19:54 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Nikolic",
"H.",
""
]
] | Although there is no relative motion among different points on a rotating disc, each point belongs to a different noninertial frame. This fact, not recognized in previous approaches to the Ehrenfest paradox and related problems, is exploited to give a correct treatment of a rotating ring and a rotating disc. Tensile st... |
gr-qc/0209020 | Patrick McDonald | Avner Ash and Patrick McDonald | Moment Problems and the Causal Set Approach to Quantum Gravity | 24 pages. To appear: Journal of Mathematical Physics | J.Math.Phys. 44 (2003) 1666-1678 | 10.1063/1.1519668 | null | gr-qc | null | We study a collection of discrete Markov chains related to the causal set
approach to modeling discrete theories of quantum gravity. The transition
probabilities of these chains satisfy a general covariance principle, a
causality principle, and a renormalizability condition. The corresponding
dynamics are completely ... | [
{
"created": "Fri, 6 Sep 2002 21:26:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ash",
"Avner",
""
],
[
"McDonald",
"Patrick",
""
]
] | We study a collection of discrete Markov chains related to the causal set approach to modeling discrete theories of quantum gravity. The transition probabilities of these chains satisfy a general covariance principle, a causality principle, and a renormalizability condition. The corresponding dynamics are completely de... |
2301.06972 | Iver Brevik | Iver Brevik and Alexander V. Timoshkin | Singular behavior of the dark universe under the effect of thermal
radiation in curved spacetime | 7 pages, latex2e | Symmetry 15, 257 (2023) | 10.3390/sym15020257 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the late-time accelerated universe in the
Friedmann-Robertson-Walker (FRW) spacetime with a nonzero curvature, and
investigate cosmological models when the cosmic fluid is taken to be
inhomogeneous and viscous (bulk viscous), coupled to dark matter. We consider
the influence from thermal effects caused by... | [
{
"created": "Tue, 17 Jan 2023 15:51:27 GMT",
"version": "v1"
}
] | 2023-01-18 | [
[
"Brevik",
"Iver",
""
],
[
"Timoshkin",
"Alexander V.",
""
]
] | We consider the late-time accelerated universe in the Friedmann-Robertson-Walker (FRW) spacetime with a nonzero curvature, and investigate cosmological models when the cosmic fluid is taken to be inhomogeneous and viscous (bulk viscous), coupled to dark matter. We consider the influence from thermal effects caused by H... |
gr-qc/9708007 | Uwe Muench | Friedrich W. Hehl, Uwe Muench | A note on post-Riemannian structures of spacetime | 3 pages, LaTeX, no figures, reply to gr-qc/9706068 | null | null | null | gr-qc | null | A four-dimensional differentiable manifold is given with an arbitrary linear
connection $\Gamma_\alpha^\beta=\Gamma_{i\alpha}^\beta dx^i$. Megged has
claimed that he can define a metric $G_{\alpha\beta}$ by means of a certain
integral equation such that the connection is compatible with the metric. We
point out that ... | [
{
"created": "Tue, 5 Aug 1997 12:43:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hehl",
"Friedrich W.",
""
],
[
"Muench",
"Uwe",
""
]
] | A four-dimensional differentiable manifold is given with an arbitrary linear connection $\Gamma_\alpha^\beta=\Gamma_{i\alpha}^\beta dx^i$. Megged has claimed that he can define a metric $G_{\alpha\beta}$ by means of a certain integral equation such that the connection is compatible with the metric. We point out that Me... |
2312.08122 | Xin Zhang | Tian-Yang Sun, Chun-Yu Xiong, Shang-Jie Jin, Yu-Xin Wang, Jing-Fei
Zhang, Xin Zhang | Efficient parameter inference for gravitational wave signals in the
presence of transient noises using temporal and time-spectral fusion
normalizing flow | 13 pages, 10 figures | Chinese Physics C Vol. 48, No. 4 (2024) 045108 | 10.1088/1674-1137/ad2a5f | null | gr-qc astro-ph.CO astro-ph.IM hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Glitches represent a category of non-Gaussian and transient noise that
frequently intersects with gravitational wave (GW) signals, exerting a notable
impact on the processing of GW data. The inference of GW parameters, crucial
for GW astronomy research, is particularly susceptible to such interference. In
this study,... | [
{
"created": "Wed, 13 Dec 2023 13:21:05 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Feb 2024 10:03:55 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2024 15:39:46 GMT",
"version": "v3"
}
] | 2024-03-15 | [
[
"Sun",
"Tian-Yang",
""
],
[
"Xiong",
"Chun-Yu",
""
],
[
"Jin",
"Shang-Jie",
""
],
[
"Wang",
"Yu-Xin",
""
],
[
"Zhang",
"Jing-Fei",
""
],
[
"Zhang",
"Xin",
""
]
] | Glitches represent a category of non-Gaussian and transient noise that frequently intersects with gravitational wave (GW) signals, exerting a notable impact on the processing of GW data. The inference of GW parameters, crucial for GW astronomy research, is particularly susceptible to such interference. In this study, w... |
2406.00932 | Justin Feng | Justin C. Feng, Pisin Chen | Cosmological constant as an integration constant | 6 pages. Added references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discrepancy between the observed value of the cosmological constant (CC)
and its expected value from quantum field theoretical considerations motivates
the search for a theory in which the CC is decoupled from the vacuum energy. In
this article, we consider theories in which the CC is regarded as an
integration c... | [
{
"created": "Mon, 3 Jun 2024 02:03:09 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jun 2024 13:53:26 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Jun 2024 10:47:15 GMT",
"version": "v3"
}
] | 2024-06-14 | [
[
"Feng",
"Justin C.",
""
],
[
"Chen",
"Pisin",
""
]
] | The discrepancy between the observed value of the cosmological constant (CC) and its expected value from quantum field theoretical considerations motivates the search for a theory in which the CC is decoupled from the vacuum energy. In this article, we consider theories in which the CC is regarded as an integration con... |
0710.0855 | Domenec Espriu | J.A.Cabrer and D.Espriu (Universitat de Barcelona) | Secular effects on inflation from one-loop quantum gravity | 14 pages, 3 figures | Phys.Lett.B663:361-366,2008 | 10.1016/j.physletb.2008.04.047 | UB-ECM-PF-07/25 | gr-qc | null | In this paper we revisit and extend a previous analysis where the possible
relevance of quantum gravity effects in a cosmological setup was studied. The
object of interest are non-local (logarithmic) terms generated in the effective
action of gravity due to the exchange in loops of massless modes (such as
photons or ... | [
{
"created": "Wed, 3 Oct 2007 17:54:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cabrer",
"J. A.",
"",
"Universitat de Barcelona"
],
[
"Espriu",
"D.",
"",
"Universitat de Barcelona"
]
] | In this paper we revisit and extend a previous analysis where the possible relevance of quantum gravity effects in a cosmological setup was studied. The object of interest are non-local (logarithmic) terms generated in the effective action of gravity due to the exchange in loops of massless modes (such as photons or th... |
0906.3189 | Liselotte De Groote | L. De Groote, N. Van den Bergh, L. Wylleman | Petrov type D pure radiation fields of Kundt's class | null | null | 10.1063/1.3502459 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present all Petrov type D pure radiation space-times, with or without
cosmological constant, with a shear-free, non-diverging geodesic principal null
congruence.
| [
{
"created": "Wed, 17 Jun 2009 14:19:26 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"De Groote",
"L.",
""
],
[
"Bergh",
"N. Van den",
""
],
[
"Wylleman",
"L.",
""
]
] | We present all Petrov type D pure radiation space-times, with or without cosmological constant, with a shear-free, non-diverging geodesic principal null congruence. |
2204.06981 | Miika Sarkkinen | Niko Jokela, K. Kajantie, Miika Sarkkinen | Gravitational wave memory and its tail in cosmology | 51 pages, 15 figures; v2: references added, typos corrected, a couple
of explanatory comments in Sec. 4.1 added, argument in Sec. 4.3 revised,
published version | Phys. Rev. D 106, 064022 (2022) | 10.1103/PhysRevD.106.064022 | HIP-2022-7/TH | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational wave memory effect in the FRW cosmological model with
matter and cosmological constant. Since the background is curved, gravitational
radiation develops a tail part arriving after the main signal that travels
along the past light cone of the observer. First we discuss first order
gravitational ... | [
{
"created": "Thu, 14 Apr 2022 14:15:00 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2022 13:32:56 GMT",
"version": "v2"
}
] | 2022-11-02 | [
[
"Jokela",
"Niko",
""
],
[
"Kajantie",
"K.",
""
],
[
"Sarkkinen",
"Miika",
""
]
] | We study gravitational wave memory effect in the FRW cosmological model with matter and cosmological constant. Since the background is curved, gravitational radiation develops a tail part arriving after the main signal that travels along the past light cone of the observer. First we discuss first order gravitational wa... |
1703.01367 | Jiri Podolsky | Jiri Podolsky, Ondrej Hruska | Yet another family of diagonal metrics for de Sitter and anti-de Sitter
spacetimes | 44 pages, 26 figures: final extended version published in Phys. Rev.
D. It contains 5 more pages and 2 new figures on physical application - exact
gravitational field of a tachyon moving in the (anti-)de Sitter spacetime.
This paper was selected in June 2017 as Phys. Rev. D "EDITORS' SUGGESTION" | Phys. Rev. D 95, 124052 (2017) | 10.1103/PhysRevD.95.124052 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present and analyze a new class of coordinate representations
of de Sitter and anti-de Sitter spacetimes for which the metrics are diagonal
and (typically) static and axially symmetric. Contrary to the well-known forms
of these fundamental geometries, that usually correspond to a 1+3 foliation
with th... | [
{
"created": "Sat, 4 Mar 2017 00:22:46 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2017 16:17:11 GMT",
"version": "v2"
}
] | 2017-07-11 | [
[
"Podolsky",
"Jiri",
""
],
[
"Hruska",
"Ondrej",
""
]
] | In this work we present and analyze a new class of coordinate representations of de Sitter and anti-de Sitter spacetimes for which the metrics are diagonal and (typically) static and axially symmetric. Contrary to the well-known forms of these fundamental geometries, that usually correspond to a 1+3 foliation with the ... |
gr-qc/9510009 | Alan Rendall | Alan D. Rendall | Solutions of the Einstein equations with matter | 21 pages, contribution to proceedings of GR14 conference | null | null | null | gr-qc | null | Recent results on solutions of the Einstein equations with matter are
surveyed and a number of open questions are stated. The first group of results
presented concern asymptotically flat spacetimes, both stationary and
dynamical. Then there is a discussion of solutions of the equations describing
matter in special re... | [
{
"created": "Thu, 5 Oct 1995 09:37:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rendall",
"Alan D.",
""
]
] | Recent results on solutions of the Einstein equations with matter are surveyed and a number of open questions are stated. The first group of results presented concern asymptotically flat spacetimes, both stationary and dynamical. Then there is a discussion of solutions of the equations describing matter in special rela... |
2303.12708 | Micha{\l} Bobula | Micha{\l} Bobula and Tomasz Paw{\l}owski | Rainbow Oppenheimer-Snyder collapse and the entanglement entropy
production | BibTex, 18 pages, 5 figures | null | 10.1103/PhysRevD.108.026016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dust ball collapse is studied in the context of the "rainbow metric"
approach (where the matter content is supplemented with a scalar field
perturbation) to the Oppenheimer-Snyder collapse scenario within the framework
of loop quantum cosmology. The global spacetime structure is determined for
this scenario and s... | [
{
"created": "Wed, 22 Mar 2023 16:47:33 GMT",
"version": "v1"
}
] | 2023-08-02 | [
[
"Bobula",
"Michał",
""
],
[
"Pawłowski",
"Tomasz",
""
]
] | The dust ball collapse is studied in the context of the "rainbow metric" approach (where the matter content is supplemented with a scalar field perturbation) to the Oppenheimer-Snyder collapse scenario within the framework of loop quantum cosmology. The global spacetime structure is determined for this scenario and sub... |
1805.03346 | Edward Anderson | Edward Anderson | Rubber Relationalism: Smallest Graph-Theoretically Nontrivial Leibniz
Spaces | 35 pages including 31 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kendall's Similarity Shape Theory for constellations of N points in the
carrier space $\mathbb{R}^d$ as quotiented by the similarity group was
developed for use in Probability and Statistics. It was subsequently shown to
reside within Mechanics' Shape-and-Scale Theory, in which points are
interpreted as particles, ca... | [
{
"created": "Wed, 9 May 2018 01:45:57 GMT",
"version": "v1"
}
] | 2018-05-10 | [
[
"Anderson",
"Edward",
""
]
] | Kendall's Similarity Shape Theory for constellations of N points in the carrier space $\mathbb{R}^d$ as quotiented by the similarity group was developed for use in Probability and Statistics. It was subsequently shown to reside within Mechanics' Shape-and-Scale Theory, in which points are interpreted as particles, carr... |
gr-qc/0604001 | Alexander E. Shalyt-Margolin | Alex. E. Shalyt-Margolin | The Quantum and Statistical Theory of Early Universe and Its Possible
Applications to Cosmology | 72 pages, Latex, to appear in Volumes dedicated to 70 Birthday of
Professor R.M. Santilli | null | null | null | gr-qc | null | The subject of this study is Quantum and Statistical Mechanics of the Early
Universe. In it a new approach to investigation of these two theories - density
matrix deformation - is proposed. The distinguishing feature of the proposed
approach as compared to the previous ones is the fact that here the density
matrix is... | [
{
"created": "Sat, 1 Apr 2006 07:18:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shalyt-Margolin",
"Alex. E.",
""
]
] | The subject of this study is Quantum and Statistical Mechanics of the Early Universe. In it a new approach to investigation of these two theories - density matrix deformation - is proposed. The distinguishing feature of the proposed approach as compared to the previous ones is the fact that here the density matrix is s... |
1409.0310 | Cosimo Bambi | Cosimo Bambi | Constraining the Cardoso-Pani-Rico metric with future observations of
SgrA$^*$ | 8 pages, 3 figures. v2: refereed version | Class.Quant.Grav.32:065005,2015 | 10.1088/0264-9381/32/6/065005 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | SgrA$^*$, the supermassive black hole candidate at the center of our Galaxy,
seems to be one of the most promising object to test the Kerr black hole
hypothesis with near future observations. In a few years, it will hopefully be
possible to measure a number of relativistic effects around this body, and the
combinatio... | [
{
"created": "Mon, 1 Sep 2014 07:32:02 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2015 02:28:53 GMT",
"version": "v2"
}
] | 2015-02-25 | [
[
"Bambi",
"Cosimo",
""
]
] | SgrA$^*$, the supermassive black hole candidate at the center of our Galaxy, seems to be one of the most promising object to test the Kerr black hole hypothesis with near future observations. In a few years, it will hopefully be possible to measure a number of relativistic effects around this body, and the combination ... |
gr-qc/0003024 | Homer G. Ellis | Homer G. Ellis | Darkholes: Nicer than blackholes - with a bright side, too (Does energy
produce gravity?) | 10 pages, LaTeX with REVTeX, 5 Encapsulated PostScript figures;
submitted to Physical Review D on 29 February 2000 | null | null | null | gr-qc | null | The geometry of three-dimensional space guides the search for a better model
than the blackhole with its unwelcome singularity. An elementary construction
produces on the 4-manifold of 2-spheres in a Riemannian 3-space a space-time
metric invariant under uniform conformal transformations of the 3-space. When
the 3-sp... | [
{
"created": "Wed, 8 Mar 2000 02:39:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ellis",
"Homer G.",
""
]
] | The geometry of three-dimensional space guides the search for a better model than the blackhole with its unwelcome singularity. An elementary construction produces on the 4-manifold of 2-spheres in a Riemannian 3-space a space-time metric invariant under uniform conformal transformations of the 3-space. When the 3-spac... |
2208.09984 | Ion Vasile Vancea | C. F. L. Godinho and I. V. Vancea | Fractional Mimetic Dark Matter Model in Fractional Action-like
Variational Approach | 17 pages. References corrected | null | null | null | gr-qc hep-th physics.class-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we propose a new model of fractional mimetic dark matter based
on the fractional action-like variational approach FALVA implementation of
fractionality. The model is non-local at classical level and its equations of
motion are highly non-linear. We discuss two particular cases of non-fractional
and fra... | [
{
"created": "Sun, 21 Aug 2022 23:30:41 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Aug 2022 21:54:44 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Aug 2022 12:30:39 GMT",
"version": "v3"
},
{
"created": "Sat, 10 Sep 2022 12:20:32 GMT",
"version": "v4"
}
] | 2022-09-13 | [
[
"Godinho",
"C. F. L.",
""
],
[
"Vancea",
"I. V.",
""
]
] | In this paper, we propose a new model of fractional mimetic dark matter based on the fractional action-like variational approach FALVA implementation of fractionality. The model is non-local at classical level and its equations of motion are highly non-linear. We discuss two particular cases of non-fractional and fract... |
2011.04620 | Sam Patrick | Sam Patrick | Rotational superradiance with Bogoliubov dispersion | 41 pages, 13 figures | null | 10.1088/1361-6382/abf1fc | null | gr-qc cond-mat.quant-gas physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | Rotational superradiance affects the dynamics of many rotating systems in
nature, through either stimulated or spontaneous extraction of energy and
angular momentum. By now, this process is well-studied in the relativistic
setting, where systems are intrinsically dispersion-free. In many condensed
matter systems, how... | [
{
"created": "Mon, 9 Nov 2020 18:26:36 GMT",
"version": "v1"
}
] | 2021-06-09 | [
[
"Patrick",
"Sam",
""
]
] | Rotational superradiance affects the dynamics of many rotating systems in nature, through either stimulated or spontaneous extraction of energy and angular momentum. By now, this process is well-studied in the relativistic setting, where systems are intrinsically dispersion-free. In many condensed matter systems, howev... |
0706.0463 | Claes Uggla | Claes Uggla | The Nature of Generic Cosmological Singularities | 14 pages, six figures; invited talk at the 11th Marcel Grossmann
Meeting on Recent Developments in General Relativity, Berlin, Germany, 23-29
July 2006 | null | 10.1142/9789812834300_0005 | null | gr-qc | null | The existence of a singularity by definition implies a preferred scale--the
affine parameter distance from/to the singularity of a causal geodesic that is
used to define it. However, this variable scale is also captured by the
expansion along the geodesic, and this can be used to obtain a regularized
state space pict... | [
{
"created": "Mon, 4 Jun 2007 15:51:30 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Uggla",
"Claes",
""
]
] | The existence of a singularity by definition implies a preferred scale--the affine parameter distance from/to the singularity of a causal geodesic that is used to define it. However, this variable scale is also captured by the expansion along the geodesic, and this can be used to obtain a regularized state space pictur... |
1805.08507 | Yong Tang | Yong Tang, Yue-Liang Wu | Inflation in gauge theory of gravity with local scaling symmetry and
quantum induced symmetry breaking | 1+14 pages, 3 figures, discussions and references updated, published
version | Phys.Lett. B784 (2018) 163-168 | 10.1016/j.physletb.2018.07.048 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the gauge theory of gravity with local scaling symmetry proposed
recently in 1712.04537 and 1506.01807, we investigate whether the scalar field
therein can be responsible for the inflation. We show that the classical theory
would suffer from the difficulty that inflation can start but will never stop.
We... | [
{
"created": "Tue, 22 May 2018 11:27:49 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Aug 2018 13:21:32 GMT",
"version": "v2"
}
] | 2018-08-07 | [
[
"Tang",
"Yong",
""
],
[
"Wu",
"Yue-Liang",
""
]
] | Motivated by the gauge theory of gravity with local scaling symmetry proposed recently in 1712.04537 and 1506.01807, we investigate whether the scalar field therein can be responsible for the inflation. We show that the classical theory would suffer from the difficulty that inflation can start but will never stop. We e... |
gr-qc/9607031 | Mijan Huq | Richard A. Matzner, Mijan Huq, Alonso Botero, Dae Il Choi, Ullar Kask,
Juan Lara, Steven Liebling, David Neilsen, Premana Premadi and Deirdre
Shoemaker | Analysis of ``Gauge Modes'' in Linearized Relativity | 11pages LaTeX | Class.Quant.Grav.14:L21-L27,1997 | 10.1088/0264-9381/14/1/004 | null | gr-qc | null | By writing the complete set of $3 + 1$ (ADM) equations for linearized waves,
we are able to demonstrate the properties of the initial data and of the
evolution of a wave problem set by Alcubierre and Schutz. We show that the
gauge modes and constraint error modes arise in a straightforward way in the
analysis, and ar... | [
{
"created": "Sun, 14 Jul 1996 19:44:53 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Matzner",
"Richard A.",
""
],
[
"Huq",
"Mijan",
""
],
[
"Botero",
"Alonso",
""
],
[
"Choi",
"Dae Il",
""
],
[
"Kask",
"Ullar",
""
],
[
"Lara",
"Juan",
""
],
[
"Liebling",
"Steven",
""
],
[
"Neilsen... | By writing the complete set of $3 + 1$ (ADM) equations for linearized waves, we are able to demonstrate the properties of the initial data and of the evolution of a wave problem set by Alcubierre and Schutz. We show that the gauge modes and constraint error modes arise in a straightforward way in the analysis, and are ... |
2109.00262 | Xiao Yan Chew | Xiao Yan Chew and Kok-Geng Lim | Non-Abelian Wormholes Threaded by a Yang-Mills-Higgs Field beyond the
BPS Limit | 16 pages and 8 figures. Description of junction condition for
wormhole throat has been added in a subsection and acknowledgement part has
been updated for this latest version. arXiv admin note: text overlap with
arXiv:2009.13334 | null | 10.1103/PhysRevD.105.084058 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We construct numerically the symmetric non-Abelian wormholes which are
supported by a phantom field in the Einstein-Yang-Mills-Higgs theory beyond
Bogomol'nyi-Prasad-Sommerfield (BPS) limit where the Higgs self-interaction
constant $\lambda$ is non-vanishing. Analogous to the BPS limit, the probe
limit is the Yang-Mi... | [
{
"created": "Wed, 1 Sep 2021 09:16:37 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2022 02:33:43 GMT",
"version": "v2"
}
] | 2022-04-29 | [
[
"Chew",
"Xiao Yan",
""
],
[
"Lim",
"Kok-Geng",
""
]
] | We construct numerically the symmetric non-Abelian wormholes which are supported by a phantom field in the Einstein-Yang-Mills-Higgs theory beyond Bogomol'nyi-Prasad-Sommerfield (BPS) limit where the Higgs self-interaction constant $\lambda$ is non-vanishing. Analogous to the BPS limit, the probe limit is the Yang-Mill... |
1212.2604 | Luisa Jaime | Luisa G. Jaime, Leonardo Pati\~no and Marcelo Salgado | About matter and dark-energy domination eras in R^n gravity or lack
thereof | 6 pages, 6 figures in 2 panels. Accepted for publication in Phys.
Rev. D | null | 10.1103/PhysRevD.87.024029 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide further numerical evidence which shows that R^n models in f(R)
metric gravity whether produces a late time acceleration in the Universe or a
matter domination era (usually a transient one) but not both. Our results
confirm the findings of Amendola et al. (2007), but using a different approach
that avoids t... | [
{
"created": "Tue, 11 Dec 2012 20:12:47 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Jaime",
"Luisa G.",
""
],
[
"Patiño",
"Leonardo",
""
],
[
"Salgado",
"Marcelo",
""
]
] | We provide further numerical evidence which shows that R^n models in f(R) metric gravity whether produces a late time acceleration in the Universe or a matter domination era (usually a transient one) but not both. Our results confirm the findings of Amendola et al. (2007), but using a different approach that avoids the... |
gr-qc/0607087 | Abhas Mitra | Abhas Mitra | Does Pressure Increase or Decrease Active Gravitational Mass Density? | The originally accepted journal version, subsequent modifications
removed | Phys. Lett. B. 685(1), 8-11 (2010) | 10.1016/j.physletb.2010.01.048 | null | gr-qc astro-ph | null | It is known that, for a static fluid sphere, the GeneralRelativistic (GR)
Effective Mass Energy Density (EMD) appears to be (rho + 3 p), where rho is the
bare mass density, p is the isotropic pressure, from a purely localized view
point. But since there is no truly local definition of ``gravitational field'',
such a ... | [
{
"created": "Fri, 21 Jul 2006 08:00:00 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jul 2006 06:34:27 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Oct 2006 10:55:00 GMT",
"version": "v3"
},
{
"created": "Fri, 27 Oct 2006 10:37:29 GMT",
"version": "v4"
}
] | 2015-06-25 | [
[
"Mitra",
"Abhas",
""
]
] | It is known that, for a static fluid sphere, the GeneralRelativistic (GR) Effective Mass Energy Density (EMD) appears to be (rho + 3 p), where rho is the bare mass density, p is the isotropic pressure, from a purely localized view point. But since there is no truly local definition of ``gravitational field'', such a no... |
1207.0207 | Tiziana Di Salvo Dr. | Luciano Burderi, Tiziana Di Salvo | The quantum clock: a critical discussion on space-time | 12 pages, oral presentation at the 13th Marcel Grossmann Meeting,
Stockholm 1-7 July 2012 | Phys. Rev. D 93, 064017 (2016) | 10.1103/PhysRevD.93.064017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We critically discuss the measure of very short time intervals. By means of a
"gedankenexperiment", we describe an ideal clock based on the occurrence of
completely random events. We show that the minimum time interval Delta t that
this clock can measure scales as the inverse of its size Delta r. This implies
an unce... | [
{
"created": "Sun, 1 Jul 2012 13:50:50 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Burderi",
"Luciano",
""
],
[
"Di Salvo",
"Tiziana",
""
]
] | We critically discuss the measure of very short time intervals. By means of a "gedankenexperiment", we describe an ideal clock based on the occurrence of completely random events. We show that the minimum time interval Delta t that this clock can measure scales as the inverse of its size Delta r. This implies an uncert... |
1408.5353 | Vasilis Oikonomou | V.K. Oikonomou, N. Karagiannakis | Late Time Cosmological Evolution in f(R) theories with Ordinary and
Collisional Matter | null | null | 10.1088/0264-9381/32/8/085001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the late time cosmological evolution of $f(R)$ theories of modified
gravity, with the matter content of the universe being that of collisional self
interacting matter. We assume that the universe is described by a flat
Friedmann-Lemaitre-Robertson-Walker metric and that it is matter and dark
energy dominated... | [
{
"created": "Fri, 22 Aug 2014 16:33:52 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Oikonomou",
"V. K.",
""
],
[
"Karagiannakis",
"N.",
""
]
] | We study the late time cosmological evolution of $f(R)$ theories of modified gravity, with the matter content of the universe being that of collisional self interacting matter. We assume that the universe is described by a flat Friedmann-Lemaitre-Robertson-Walker metric and that it is matter and dark energy dominated. ... |
1607.06877 | Tiberiu Harko | T. Harko, M. K. Mak | Exact power series solutions of the structure equations of the general
relativistic isotropic fluid stars with linear barotropic and polytropic
equations of state | 21 pages, 3 figures, accepted for publication in Astrophys. Space
Science | Astrophysics and Space Science, 361(9), 1-19 (2016) | 10.1007/s10509-016-2875-0 | null | gr-qc astro-ph.SR math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Obtaining exact solutions of the spherically symmetric general relativistic
gravitational field equations describing the interior structure of an isotropic
fluid sphere is a long standing problem in theoretical and mathematical
physics. The usual approach to this problem consists mainly in the numerical
investigation... | [
{
"created": "Sat, 23 Jul 2016 01:58:47 GMT",
"version": "v1"
}
] | 2016-08-10 | [
[
"Harko",
"T.",
""
],
[
"Mak",
"M. K.",
""
]
] | Obtaining exact solutions of the spherically symmetric general relativistic gravitational field equations describing the interior structure of an isotropic fluid sphere is a long standing problem in theoretical and mathematical physics. The usual approach to this problem consists mainly in the numerical investigation o... |
1104.4343 | Ian Morrison | Donald Marolf and Ian A. Morrison | The IR stability of de Sitter QFT: Physical initial conditions | 32 pages, 3 figures | General Relativity and Gravitation 43 3497-3530 (2011) | 10.1007/s10714-011-1233-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work uses Lorentz-signature in-in perturbation theory to analyze the
late-time behavior of correlators in time-dependent interacting massive scalar
field theory in de Sitter space. We study a scenario recently considered by
Krotov and Polyakov in which the coupling $g$ turns on smoothly at finite time,
starting ... | [
{
"created": "Thu, 21 Apr 2011 19:58:37 GMT",
"version": "v1"
}
] | 2016-03-22 | [
[
"Marolf",
"Donald",
""
],
[
"Morrison",
"Ian A.",
""
]
] | This work uses Lorentz-signature in-in perturbation theory to analyze the late-time behavior of correlators in time-dependent interacting massive scalar field theory in de Sitter space. We study a scenario recently considered by Krotov and Polyakov in which the coupling $g$ turns on smoothly at finite time, starting fr... |
2312.02217 | Alexander P. Sobolev | Alexander P. Sobolev and Aleksey Sobolev | Foundations of the theory of gravity with a constraint. Gravitational
energy of macroscopic bodies | 12 pages, 4 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The paper considers a set of equations describing the static isotropic
gravity field of a macroscopic body within the framework of the theory of
gravity with a constraint. A general approximate solution of these equations is
obtained. The solution exists only at certain values for the three integration
constants. The... | [
{
"created": "Sun, 3 Dec 2023 11:41:25 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2023 10:16:54 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Feb 2024 06:50:00 GMT",
"version": "v3"
}
] | 2024-02-08 | [
[
"Sobolev",
"Alexander P.",
""
],
[
"Sobolev",
"Aleksey",
""
]
] | The paper considers a set of equations describing the static isotropic gravity field of a macroscopic body within the framework of the theory of gravity with a constraint. A general approximate solution of these equations is obtained. The solution exists only at certain values for the three integration constants. The o... |
1610.03497 | Maarten van de Meent | Maarten van de Meent | Self-force corrections to the periapsis advance around a spinning black
hole | 6 pages, 3 figures, Updated to match PRL accepted version | Phys. Rev. Lett. 118, 011101 (2017) | 10.1103/PhysRevLett.118.011101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The linear in mass ratio correction to the periapsis advance of equatorial
orbits around a spinning black hole is calculated for the first time and to
very high precision, providing a key benchmark for different approaches
modelling spinning binaries. The high precision of the calculation is leveraged
to discriminate... | [
{
"created": "Tue, 11 Oct 2016 20:00:08 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2016 16:28:21 GMT",
"version": "v2"
}
] | 2017-01-11 | [
[
"van de Meent",
"Maarten",
""
]
] | The linear in mass ratio correction to the periapsis advance of equatorial orbits around a spinning black hole is calculated for the first time and to very high precision, providing a key benchmark for different approaches modelling spinning binaries. The high precision of the calculation is leveraged to discriminate b... |
1603.01457 | Behnam Pourhassan | Behnam Pourhassan, Mir Faizal, Ujjal Debnath | Effects of Thermal Fluctuations on the Thermodynamics of Modified
Hayward Black Hole | 13 pages, 4 Figures. Accepted for publication in EPJC | Eur. Phys. J. C 76, 3 (2016) 145 | 10.1140/epjc/s10052-016-3998-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we analyze the effects of thermal fluctuations on the
thermodynamics of a modified Hayward black hole. These thermal fluctuations
will produce correction terms for various thermodynamic quantities like
entropy, pressure, inner energy and specific heats. We also investigate the
effect of these correction... | [
{
"created": "Fri, 4 Mar 2016 18:12:24 GMT",
"version": "v1"
}
] | 2016-03-21 | [
[
"Pourhassan",
"Behnam",
""
],
[
"Faizal",
"Mir",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this work, we analyze the effects of thermal fluctuations on the thermodynamics of a modified Hayward black hole. These thermal fluctuations will produce correction terms for various thermodynamic quantities like entropy, pressure, inner energy and specific heats. We also investigate the effect of these correction t... |
1804.01124 | Anzhong Wang | Jacob Oost, Madhurima Bhattacharjee, and Anzhong Wang | Gravitational plane waves in Einstein-aether theory | revtex4, no figures & tables. Gen. Relativ. Grav. 50 (2018) 124 | Gen. Relativ. Grav. 50 (2018) 124 | 10.1007/s10714-018-2453-6 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we systematically study spacetimes of gravitational plane
waves in Einstein-aether theory. Due to the presence of the timelike aether
vector field, now the problem in general becomes overdetermined. In particular,
for the linearly polarized plane waves, there are five independent vacuum
Einstein-aether... | [
{
"created": "Tue, 3 Apr 2018 18:36:22 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2018 02:52:35 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2018 09:53:38 GMT",
"version": "v3"
}
] | 2018-10-24 | [
[
"Oost",
"Jacob",
""
],
[
"Bhattacharjee",
"Madhurima",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we systematically study spacetimes of gravitational plane waves in Einstein-aether theory. Due to the presence of the timelike aether vector field, now the problem in general becomes overdetermined. In particular, for the linearly polarized plane waves, there are five independent vacuum Einstein-aether f... |
1711.08714 | Joao Paulo Morais Graca | J. P. Morais Gra\c{c}a and Iarley P. Lobo | Scalar QNMs for higher dimensional black holes surrounded by
quintessence in Rastall gravity | 6 figures, 11 pages | Eur. Phys. J. C (2018) 78:101 | 10.1140/epjc/s10052-018-5598-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacetime solution for a black hole, surrounded by an exotic matter
field, in Rastall gravity, is calculated in an arbitrary d-dimensional
spacetime. After this, we calculate the scalar quasinormal modes of such
solution, and study the shift on the modes caused by the modification of the
theory of gravity, i.e., ... | [
{
"created": "Thu, 23 Nov 2017 14:39:56 GMT",
"version": "v1"
}
] | 2018-06-12 | [
[
"Graça",
"J. P. Morais",
""
],
[
"Lobo",
"Iarley P.",
""
]
] | The spacetime solution for a black hole, surrounded by an exotic matter field, in Rastall gravity, is calculated in an arbitrary d-dimensional spacetime. After this, we calculate the scalar quasinormal modes of such solution, and study the shift on the modes caused by the modification of the theory of gravity, i.e., by... |
2208.13565 | Dr. Sudhaker Upadhyay | Dharm Veer Singh, Vinod Kumar Bhardwaj and Sudhaker Upadhyay | Thermodynamic properties, thermal image and phase transition of
Einstein-Gauss-Bonnet black hole coupled with nonlinear electrodynamics | 20 pages, 24 captioned figures, published in Eur. Phys. J. Plus | Eur. Phys. J. Plus 137 (2022) 969 | 10.1140/epjp/s13360-022-03208-2 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We obtain an exact solution of $AdS$ black hole solution in
Einstein-Gauss-Bonnet (EGB) gravity coupled with nonlinear electrodynamics. It
interpolates with the $AdS$ regular black hole and $AdS$ EGB black hole in the
absence of the Gauss-Bonnet coupling constant and both magnetic monopole charge
and deviation parame... | [
{
"created": "Fri, 26 Aug 2022 13:10:59 GMT",
"version": "v1"
}
] | 2022-08-30 | [
[
"Singh",
"Dharm Veer",
""
],
[
"Bhardwaj",
"Vinod Kumar",
""
],
[
"Upadhyay",
"Sudhaker",
""
]
] | We obtain an exact solution of $AdS$ black hole solution in Einstein-Gauss-Bonnet (EGB) gravity coupled with nonlinear electrodynamics. It interpolates with the $AdS$ regular black hole and $AdS$ EGB black hole in the absence of the Gauss-Bonnet coupling constant and both magnetic monopole charge and deviation paramete... |
1011.2041 | Lorenzo Fatibene | L. Fatibene, M. Ferraris, M. Francaviglia | Inducing Barbero-Immirzi Connections along SU(2)-reductions of Bundles
on Spacetime | 6 pages, some comments added | null | 10.1103/PhysRevD.84.064035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We shall present here a general apt technique to induce connections along
bundle reductions which is different from the standard restriction. This
clarifies and generalizes the standard procedure to define Barbero-Immirzi (BI)
connection, though on spacetime. The standard spacial BI connection used in LQG
is then obt... | [
{
"created": "Tue, 9 Nov 2010 11:09:46 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 2011 10:16:20 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Fatibene",
"L.",
""
],
[
"Ferraris",
"M.",
""
],
[
"Francaviglia",
"M.",
""
]
] | We shall present here a general apt technique to induce connections along bundle reductions which is different from the standard restriction. This clarifies and generalizes the standard procedure to define Barbero-Immirzi (BI) connection, though on spacetime. The standard spacial BI connection used in LQG is then obtai... |
gr-qc/0506130 | Reinhard Meinel | Reinhard Meinel | On the black hole limit of rotating fluid bodies in equilibrium | 8 pages, v2: one footnote and one reference added, accepted for
publication in CQG | Class.Quant.Grav.23:1359-1364,2006 | 10.1088/0264-9381/23/4/016 | null | gr-qc astro-ph hep-th | null | Recently, it was shown that the extreme Kerr black hole is the only candidate
for a (Kerr) black hole limit of stationary and axisymmetric, uniformly
rotating perfect fluid bodies with a zero temperature equation of state. In
this paper, necessary and sufficient conditions for reaching the black hole
limit are presen... | [
{
"created": "Wed, 29 Jun 2005 10:10:17 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jan 2006 14:02:54 GMT",
"version": "v2"
}
] | 2010-12-23 | [
[
"Meinel",
"Reinhard",
""
]
] | Recently, it was shown that the extreme Kerr black hole is the only candidate for a (Kerr) black hole limit of stationary and axisymmetric, uniformly rotating perfect fluid bodies with a zero temperature equation of state. In this paper, necessary and sufficient conditions for reaching the black hole limit are presente... |
gr-qc/9703049 | Tsao Chang | T. Chang | A proposed gravitodynamic theory | 10 pages, Latex, no figures | Chin. J. Syst. Eng. Electron. 6 (1995) 265-272 | null | null | gr-qc | null | This paper proposes a gravitodynamic theory because there are similarities
between gravitational theory and electrodynamics. Based on Einstein's principle
of equivalence, two coordinate conditions are proposed into the
four-dimensional line element and transformations. As a consequence,the
equation of motion for grav... | [
{
"created": "Tue, 18 Mar 1997 22:38:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chang",
"T.",
""
]
] | This paper proposes a gravitodynamic theory because there are similarities between gravitational theory and electrodynamics. Based on Einstein's principle of equivalence, two coordinate conditions are proposed into the four-dimensional line element and transformations. As a consequence,the equation of motion for gravit... |
gr-qc/0604124 | Sumati Surya | Seth Major, David Rideout and Sumati Surya | On Recovering Continuum Topology from a Causal Set | The statement of a lemma has been simplified and the proof rewritten.
Errors have been corrected. One figure has been removed. All results remain
unchanged. Accepted for publication in JMP. 31 pages, 4 figs | J.Math.Phys.48:032501,2007 | 10.1063/1.2435599 | null | gr-qc hep-th math.DG | null | An important question that discrete approaches to quantum gravity must
address is how continuum features of spacetime can be recovered from the
discrete substructure. Here, we examine this question within the causal set
approach to quantum gravity, where the substructure replacing the spacetime
continuum is a locally... | [
{
"created": "Fri, 28 Apr 2006 11:30:45 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2006 05:27:00 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jan 2007 10:26:37 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Major",
"Seth",
""
],
[
"Rideout",
"David",
""
],
[
"Surya",
"Sumati",
""
]
] | An important question that discrete approaches to quantum gravity must address is how continuum features of spacetime can be recovered from the discrete substructure. Here, we examine this question within the causal set approach to quantum gravity, where the substructure replacing the spacetime continuum is a locally f... |
gr-qc/0205061 | Slava G. Turyshev | Slava G. Turyshev | Relativistic stellar aberration for the Space Interferometry Mission | 38 pages, 8 figures, 17 tables | null | null | null | gr-qc | null | This paper analyses the relativistic stellar aberration requirements for the
Space Interferometry Mission (SIM). We address the issue of general
relativistic deflection of light by the massive self-gravitating bodies.
Specifically, we present estimates for corresponding deflection angles due to
the monopole component... | [
{
"created": "Wed, 15 May 2002 21:31:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Turyshev",
"Slava G.",
""
]
] | This paper analyses the relativistic stellar aberration requirements for the Space Interferometry Mission (SIM). We address the issue of general relativistic deflection of light by the massive self-gravitating bodies. Specifically, we present estimates for corresponding deflection angles due to the monopole components ... |
1808.10732 | Miguel Bezares | Miguel Bezares and Carlos Palenzuela | Gravitational Waves from Dark Boson Star binary mergers | 14 pages, 11 figures | null | 10.1088/1361-6382/aae87c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave astronomy might allow us to detect the coalescence of
low-brightness astrophysical compact objects which are extremely difficult to
be observed with current electromagnetic telescopes. Besides classical sources
like black holes and neutron stars, other candidates include Exotic Compact
Objects (ECO... | [
{
"created": "Fri, 31 Aug 2018 13:23:57 GMT",
"version": "v1"
}
] | 2018-12-04 | [
[
"Bezares",
"Miguel",
""
],
[
"Palenzuela",
"Carlos",
""
]
] | Gravitational wave astronomy might allow us to detect the coalescence of low-brightness astrophysical compact objects which are extremely difficult to be observed with current electromagnetic telescopes. Besides classical sources like black holes and neutron stars, other candidates include Exotic Compact Objects (ECOs)... |
1707.05187 | Giovanni Morchio | Paolo Christillin, Giovanni Morchio | Relativistic Newtonian gravitation | Some basic issues have been further discussed | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Newton + EP + local SR imply all the GR results for central symmetric static
gravitational fields
| [
{
"created": "Fri, 14 Jul 2017 11:18:51 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2019 10:24:31 GMT",
"version": "v2"
}
] | 2019-10-04 | [
[
"Christillin",
"Paolo",
""
],
[
"Morchio",
"Giovanni",
""
]
] | Newton + EP + local SR imply all the GR results for central symmetric static gravitational fields |
2112.09446 | Sumanta Chakraborty | T. Padmanabhan and Sumanta Chakraborty | Microscopic origin of Einstein's field equations and the raison
d'\^{e}tre for a positive cosmological constant | Published Version; 12 pages; Prof. T. Padmanabhan has passed away on
17th September, 2021, while this paper was under review in a journal | Phys. Lett. B 824, 136828 (2022) | 10.1016/j.physletb.2021.136828 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paradigm of effective field theory, one hierarchically obtains the
effective action $\mathcal{A}_{\rm eff}[q, \cdots]$ for some low(er) energy
degrees of freedom $q$, by integrating out the high(er) energy degrees of
freedom $\xi$, in a path integral, based on an action $\mathcal{A}[q,\xi,
\cdots]$. We show ho... | [
{
"created": "Fri, 17 Dec 2021 11:29:02 GMT",
"version": "v1"
}
] | 2021-12-20 | [
[
"Padmanabhan",
"T.",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | In the paradigm of effective field theory, one hierarchically obtains the effective action $\mathcal{A}_{\rm eff}[q, \cdots]$ for some low(er) energy degrees of freedom $q$, by integrating out the high(er) energy degrees of freedom $\xi$, in a path integral, based on an action $\mathcal{A}[q,\xi, \cdots]$. We show how ... |
gr-qc/0405026 | Hideo Iguchi | Hideo Iguchi, Tomohiro Harada, and Filipe C Mena | Spherically symmetric perfect fluid in area-radial coordinates | Accepted by CQG. LaTex file, 14 pages, no figures | Class.Quant.Grav. 22 (2005) 841-854 | 10.1088/0264-9381/22/5/006 | null | gr-qc | null | We study the spherically symmetric collapse of a perfect fluid using
area-radial coordinates. We show that analytic mass functions describe a static
regular centre in these coordinates. In this case, a central singularity can
not be realized without an infinite discontinuity in the central density. We
construct mass ... | [
{
"created": "Thu, 6 May 2004 03:23:18 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2004 09:44:49 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jan 2005 08:40:23 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Iguchi",
"Hideo",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Mena",
"Filipe C",
""
]
] | We study the spherically symmetric collapse of a perfect fluid using area-radial coordinates. We show that analytic mass functions describe a static regular centre in these coordinates. In this case, a central singularity can not be realized without an infinite discontinuity in the central density. We construct mass fu... |
gr-qc/9408020 | null | Bjorn Jensen | On the stability of black hole event horizons | 16, grammatical errors corrected and two references added | Phys.Rev. D51 (1995) 5511-5516 | 10.1103/PhysRevD.51.5511 | null | gr-qc | null | In this work we study a {\it gedanken} experiment constructed in order to
test the cosmic censorship hypothesis and the second law of black hole
thermo-dynamics. Matter with a negative gravitating energy is imagined added to
a near extremal $U(1)$-charged static black hole in Einstein-Maxwell theory.
The dynamics of ... | [
{
"created": "Wed, 17 Aug 1994 12:07:43 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 1994 15:56:42 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Jensen",
"Bjorn",
""
]
] | In this work we study a {\it gedanken} experiment constructed in order to test the cosmic censorship hypothesis and the second law of black hole thermo-dynamics. Matter with a negative gravitating energy is imagined added to a near extremal $U(1)$-charged static black hole in Einstein-Maxwell theory. The dynamics of a ... |
2311.17013 | Hui-Yu Zhu | Kaiyuan Fan, Xi Tong, Yi Wang and Hui-Yu Zhu | Modulating binary dynamics via the termination of black hole
superradiance | 13 pages, 5 figures | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | A superradiant cloud of ultralight bosons near a rotating black hole provides
a smoking gun for particle physics in the infrared. However, tidal
perturbations from a nearby binary companion can destabilise the boson cloud
and even terminate superradiance. In this work, we consider the backreaction of
superradiance te... | [
{
"created": "Tue, 28 Nov 2023 18:08:03 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2023 17:09:50 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jan 2024 09:16:02 GMT",
"version": "v3"
}
] | 2024-01-12 | [
[
"Fan",
"Kaiyuan",
""
],
[
"Tong",
"Xi",
""
],
[
"Wang",
"Yi",
""
],
[
"Zhu",
"Hui-Yu",
""
]
] | A superradiant cloud of ultralight bosons near a rotating black hole provides a smoking gun for particle physics in the infrared. However, tidal perturbations from a nearby binary companion can destabilise the boson cloud and even terminate superradiance. In this work, we consider the backreaction of superradiance term... |
1809.00126 | Chitta Ranjan Das | B.G. Sidharth, C.R. Das, L.V. Laperashvili and H.B. Nielsen | Gravi-Weak Unification and the Black-Hole-Hedgehog's Solution with
Magnetic Field Contribution | 22 pages. arXiv admin note: text overlap with arXiv:1703.05594,
arXiv:1801.06979, arXiv:1605.01169; text overlap with arXiv:1002.4275 by
other authors | International Journal of Modern Physics A, Vol. 33 (2018) 1850188
(21 pages) | 10.1142/S0217751X18501889 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper, we investigated the gravitational black-hole-hedgehog's
solution with magnetic field contribution in the framework of the f(R)--gravity
described by the Gravi-Weak unification model. Assuming the Multiple Point
Principle (MPP), we considered the existence of the two degenerate vacua of the
Unive... | [
{
"created": "Sat, 1 Sep 2018 06:49:57 GMT",
"version": "v1"
}
] | 2018-11-15 | [
[
"Sidharth",
"B. G.",
""
],
[
"Das",
"C. R.",
""
],
[
"Laperashvili",
"L. V.",
""
],
[
"Nielsen",
"H. B.",
""
]
] | In the present paper, we investigated the gravitational black-hole-hedgehog's solution with magnetic field contribution in the framework of the f(R)--gravity described by the Gravi-Weak unification model. Assuming the Multiple Point Principle (MPP), we considered the existence of the two degenerate vacua of the Univers... |
2402.15156 | Joshi Ashok B | Ashok B. Joshi | Spacetime singularities and caustic of outgoing null hypersurfaces | 10 pages, 3 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate the caustic point developed by outgoing null
hypersurfaces and the behavior of null curves. We analyze three cases: Future,
past, and zero caustic point terminology for outgoing null hypersurfaces in the
marginally bound Lemaitre-Tolman-Bondi (LTB) metric for homogenous and
inhomogeneous... | [
{
"created": "Fri, 23 Feb 2024 07:40:16 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2024 09:24:54 GMT",
"version": "v2"
}
] | 2024-04-03 | [
[
"Joshi",
"Ashok B.",
""
]
] | In this paper, we investigate the caustic point developed by outgoing null hypersurfaces and the behavior of null curves. We analyze three cases: Future, past, and zero caustic point terminology for outgoing null hypersurfaces in the marginally bound Lemaitre-Tolman-Bondi (LTB) metric for homogenous and inhomogeneous c... |
gr-qc/9912067 | Guy Bonneau | Guy Bonneau (LPTHE, Paris) | Cohomogeneity-one Einstein-Weyl structures : a local approach | 36 pages, Latex file, corrections in some definitions and
terminology, no change in results, final version to appear in `` Journal of
Geometry and Physics" | J.Geom.Phys. 39 (2001) 135-173 | 10.1016/S0393-0440(01)00008-0 | PAR/LPTHE/99-36 | gr-qc math-ph math.DG math.MP | null | We analyse in a systematic way the (non-)compact n-dimensional Einstein Weyl
spaces equipped with a cohomogeneity-one metric. With no compactness
hypothesis, we prove that, as soon as the (n-1)-dimensional space is an
homogeneous reductive Riemannian space with an unimodular group of left-acting
isometries G
1)a no... | [
{
"created": "Thu, 16 Dec 1999 10:49:20 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2000 15:29:05 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Dec 2000 10:57:59 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Bonneau",
"Guy",
"",
"LPTHE, Paris"
]
] | We analyse in a systematic way the (non-)compact n-dimensional Einstein Weyl spaces equipped with a cohomogeneity-one metric. With no compactness hypothesis, we prove that, as soon as the (n-1)-dimensional space is an homogeneous reductive Riemannian space with an unimodular group of left-acting isometries G 1)a non-ex... |
gr-qc/0604043 | Piotr Bizon | Piotr Bizo\'n, Tadeusz Chmaj, and Gary Gibbons | Nonlinear perturbations of the Kaluza-Klein monopole | 4 pages, 4 figures | Phys.Rev.Lett.96:231103,2006 | 10.1103/PhysRevLett.96.231103 | null | gr-qc hep-th | null | We consider the nonlinear stability of the Kaluza-Klein monopole viewed as
the static solution of the five dimensional vacuum Einstein equations. Using
both numerical and analytical methods we give evidence that the Kaluza-Klein
monopole is asymptotically stable within the cohomogeneity-two biaxial Bianchi
IX ansatz ... | [
{
"created": "Mon, 10 Apr 2006 14:37:56 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2006 06:45:04 GMT",
"version": "v2"
}
] | 2009-10-07 | [
[
"Bizoń",
"Piotr",
""
],
[
"Chmaj",
"Tadeusz",
""
],
[
"Gibbons",
"Gary",
""
]
] | We consider the nonlinear stability of the Kaluza-Klein monopole viewed as the static solution of the five dimensional vacuum Einstein equations. Using both numerical and analytical methods we give evidence that the Kaluza-Klein monopole is asymptotically stable within the cohomogeneity-two biaxial Bianchi IX ansatz re... |
1003.2686 | Yang Jian | Jian Yang, Zheng Zhao, Wenbiao Liu | Tortoise coordinate and Hawking effect in the Kinnersley spacetime | 9 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking effect from the Kinnersley spacetime is investigated using the
improved Damour-Ruffini method with a new coordinate transformation. Hawking
temperature of the horizons can be obtained point by point. It is found that
Hawking temperatures of different points on the horizons are different.
Especially, Hawking t... | [
{
"created": "Sat, 13 Mar 2010 07:18:16 GMT",
"version": "v1"
}
] | 2010-03-16 | [
[
"Yang",
"Jian",
""
],
[
"Zhao",
"Zheng",
""
],
[
"Liu",
"Wenbiao",
""
]
] | Hawking effect from the Kinnersley spacetime is investigated using the improved Damour-Ruffini method with a new coordinate transformation. Hawking temperature of the horizons can be obtained point by point. It is found that Hawking temperatures of different points on the horizons are different. Especially, Hawking tem... |
1508.03478 | Aur\'elien Hees | Aur\'elien Hees and Quentin G. Bailey and Christophe Le Poncin-Lafitte
and Adrien Bourgoin and Attilio Rivoldini and Brahim Lamine and Fr\'ed\'eric
Meynadier and Christine Guerlin and Peter Wolf | Testing Lorentz symmetry with planetary orbital dynamics | 12 pages, 2 figures, version accepted for publication in Phys. Rev. D | Phys. Rev. D 92, 064049 (2015) | 10.1103/PhysRevD.92.064049 | null | gr-qc astro-ph.EP hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Planetary ephemerides are a very powerful tool to constrain deviations from
the theory of General Relativity using orbital dynamics. The effective field
theory framework called the Standard-Model Extension (SME) has been developed
in order to systematically parametrize hypothetical violations of Lorentz
symmetry (in ... | [
{
"created": "Fri, 14 Aug 2015 12:32:10 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2015 06:29:42 GMT",
"version": "v2"
}
] | 2015-10-07 | [
[
"Hees",
"Aurélien",
""
],
[
"Bailey",
"Quentin G.",
""
],
[
"Poncin-Lafitte",
"Christophe Le",
""
],
[
"Bourgoin",
"Adrien",
""
],
[
"Rivoldini",
"Attilio",
""
],
[
"Lamine",
"Brahim",
""
],
[
"Meynadier",
"Fré... | Planetary ephemerides are a very powerful tool to constrain deviations from the theory of General Relativity using orbital dynamics. The effective field theory framework called the Standard-Model Extension (SME) has been developed in order to systematically parametrize hypothetical violations of Lorentz symmetry (in th... |
1906.01331 | Bob Osano | Bob Osano | The Thermodynamics for Relativistic Multi-Fluid Systems | 10 pages, 2 figures | LHEP, Vol 3. No. 1 (2020) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article extends the single-fluid relativistic irreversible
thermodynamics theory of {\it M{\"u}ller}, {\it Israel} and {\it Stewart}
(hereafter the {MIS} theory) to a multi-fluid system with inherent species
interactions. This is illustrated in a two-fluid toy-model where an effective
complex 4-velocity plays th... | [
{
"created": "Tue, 4 Jun 2019 10:40:28 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Nov 2019 16:30:27 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Apr 2020 19:08:25 GMT",
"version": "v3"
}
] | 2020-04-23 | [
[
"Osano",
"Bob",
""
]
] | This article extends the single-fluid relativistic irreversible thermodynamics theory of {\it M{\"u}ller}, {\it Israel} and {\it Stewart} (hereafter the {MIS} theory) to a multi-fluid system with inherent species interactions. This is illustrated in a two-fluid toy-model where an effective complex 4-velocity plays the ... |
1904.07151 | Fay\c{c}al Hammad | Fay\c{c}al Hammad and Daniel Dijamco | More on spacetime thermodynamics in the light of Weyl transformations | 10 pages | Phys. Rev. D 99, 084016 (2019) | 10.1103/PhysRevD.99.084016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently found that, after performing a Weyl conformal transformation,
the familiar analogy between black hole mechanics and black hole thermodynamics
becomes ambiguous. It was argued that this fact can be traced back to the
fundamental dichotomy between matter and geometry, which is at the heart of
Einstein's... | [
{
"created": "Fri, 12 Apr 2019 11:27:17 GMT",
"version": "v1"
}
] | 2019-04-16 | [
[
"Hammad",
"Fayçal",
""
],
[
"Dijamco",
"Daniel",
""
]
] | It was recently found that, after performing a Weyl conformal transformation, the familiar analogy between black hole mechanics and black hole thermodynamics becomes ambiguous. It was argued that this fact can be traced back to the fundamental dichotomy between matter and geometry, which is at the heart of Einstein's f... |
1411.1662 | Maur\'icio Richartz | Mauricio Richartz, Angus Prain, Stefano Liberati and Silke Weinfurtner | Rotating black holes in a draining bathtub: superradiant scattering of
gravity waves | v3: 13 pages, 4 figures. Revised version with minor updates and
journal reference | Phys. Rev. D 91, 124018 (2015) | 10.1103/PhysRevD.91.124018 | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a draining rotating fluid flow background, surface perturbations behave as
a scalar field on a rotating effective black hole spacetime. We propose a new
model for the background flow which takes into account the varying depth of the
water. Numerical integration of the associated Klein-Gordon equation using
accessi... | [
{
"created": "Thu, 6 Nov 2014 17:17:36 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Dec 2014 13:56:34 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Jun 2015 19:05:07 GMT",
"version": "v3"
}
] | 2015-06-08 | [
[
"Richartz",
"Mauricio",
""
],
[
"Prain",
"Angus",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Weinfurtner",
"Silke",
""
]
] | In a draining rotating fluid flow background, surface perturbations behave as a scalar field on a rotating effective black hole spacetime. We propose a new model for the background flow which takes into account the varying depth of the water. Numerical integration of the associated Klein-Gordon equation using accessibl... |
1506.08585 | Plamen Fiziev | Plamen P. Fiziev | A realistic model of a neutron star in minimal dilatonic gravity | 10 pages, Latex file, 10 figures, English corrected | null | null | SU 1/06/2015 | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a derivation of the basic equations and boundary conditions for
relativistic static spherically symmetric stars (SSSS) in the model of minimal
dilatonic gravity (MDG) which offers an alternative and simultaneous
description of the effects of dark matter (DM) and dark energy (DE) using one
dilaton field $\P... | [
{
"created": "Mon, 29 Jun 2015 11:32:58 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 2015 03:43:58 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Jul 2015 13:19:34 GMT",
"version": "v3"
}
] | 2015-07-21 | [
[
"Fiziev",
"Plamen P.",
""
]
] | We present a derivation of the basic equations and boundary conditions for relativistic static spherically symmetric stars (SSSS) in the model of minimal dilatonic gravity (MDG) which offers an alternative and simultaneous description of the effects of dark matter (DM) and dark energy (DE) using one dilaton field $\Phi... |
1906.05442 | Guang-Zhen Kang | Guang-Zhen Kang, De-Sheng Zhang, Hong-Shi Zong and Jun Li | Fine Tuning Problem of the Cosmological Constant in a Generalized
Randall-Sundrum Model | 11 pages, 2 figures | null | 10.1088/1674-1137/abb4cd | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To solve the cosmological constant fine tuning problem, we investigate a
$(n+1)$-dimensional generalized Randall-Sundrum brane world scenario with two
$(n-1)$-branes instead of two 3-branes. Adopting an anisotropic metric ansatz,
we obtain the positive effective cosmological constant $\Omega_{eff}$ of order
$10^{-124... | [
{
"created": "Thu, 13 Jun 2019 01:18:11 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2019 02:22:08 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jun 2019 07:33:52 GMT",
"version": "v3"
},
{
"created": "Thu, 12 Sep 2019 06:17:46 GMT",
"version": "v4"
},
{
"c... | 2020-12-30 | [
[
"Kang",
"Guang-Zhen",
""
],
[
"Zhang",
"De-Sheng",
""
],
[
"Zong",
"Hong-Shi",
""
],
[
"Li",
"Jun",
""
]
] | To solve the cosmological constant fine tuning problem, we investigate a $(n+1)$-dimensional generalized Randall-Sundrum brane world scenario with two $(n-1)$-branes instead of two 3-branes. Adopting an anisotropic metric ansatz, we obtain the positive effective cosmological constant $\Omega_{eff}$ of order $10^{-124}$... |
1805.03237 | Alberto Saa | Saikat Chakraborty, Kazuharu Bamba, Alberto Saa | Dynamical properties of Bianchi-I spacetimes in $f(R)$ gravity | 9 pages. 2 Figures. Extensive revision was done. Errors were
corrected. Title has changed. A new author was added. Final version accepted
for publication in the PRD | Phys. Rev. D 99, 064048 (2019) | 10.1103/PhysRevD.99.064048 | FU-PCG-57 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a dynamical analysis in terms of new expansion-normalized
variables for homogeneous and anisotropic Bianchi-I spacetimes in $f(R)$
gravity in the presence of anisotropic matter. With a suitable choice of the
evolution parameter, the Einstein's equations are reduced to an autonomous
5-dimensional system of ... | [
{
"created": "Tue, 8 May 2018 19:16:28 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2018 12:28:24 GMT",
"version": "v2"
},
{
"created": "Mon, 21 May 2018 15:27:13 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Aug 2018 06:37:34 GMT",
"version": "v4"
},
{
"cre... | 2019-03-29 | [
[
"Chakraborty",
"Saikat",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Saa",
"Alberto",
""
]
] | We present a dynamical analysis in terms of new expansion-normalized variables for homogeneous and anisotropic Bianchi-I spacetimes in $f(R)$ gravity in the presence of anisotropic matter. With a suitable choice of the evolution parameter, the Einstein's equations are reduced to an autonomous 5-dimensional system of or... |
1609.01758 | Valeri Frolov P | Valeri P. Frolov | Notes on non-singular models of black holes | 11 pages 8 figures | null | 10.1103/PhysRevD.94.104056 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss static spherically symmetric metrics which represent non-singular
black holes in four- and higher-dimensional spacetime. We impose a set of
restrictions, such as a regularity of the metric at the center $r=0$ and
Schwarzschild asymptotic behavior at large $r$. We assume that the metric
besides mass $M$ con... | [
{
"created": "Tue, 6 Sep 2016 20:56:19 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2016 19:46:11 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Frolov",
"Valeri P.",
""
]
] | We discuss static spherically symmetric metrics which represent non-singular black holes in four- and higher-dimensional spacetime. We impose a set of restrictions, such as a regularity of the metric at the center $r=0$ and Schwarzschild asymptotic behavior at large $r$. We assume that the metric besides mass $M$ conta... |
1907.06204 | Hing Tong Cho | Hing-Tong Cho and Kin-Wang Ng | Electromagnetic coupling effects in natural inflation | 22 pages | null | 10.1088/1361-6382/ab8600 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the effects of the electromagnetic coupling in natural
inflation in a systematic manner using the Schwinger-Keldysh formalism. The
corresponding influence functional is evaluated to one-loop level. It can be
interpreted as due to a single stochastic force. The equation of motion of the
inflaton ... | [
{
"created": "Sun, 14 Jul 2019 11:05:00 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Cho",
"Hing-Tong",
""
],
[
"Ng",
"Kin-Wang",
""
]
] | In this work we study the effects of the electromagnetic coupling in natural inflation in a systematic manner using the Schwinger-Keldysh formalism. The corresponding influence functional is evaluated to one-loop level. It can be interpreted as due to a single stochastic force. The equation of motion of the inflaton fi... |
1801.05022 | Muhammad Sharif | M. Sharif and Iqra Nawazish | Wormhole Geometry and Noether Symmetry in f(R) Gravity | 33 pages, 18 figures, to appear in Annals of Physics | Ann. Phys. 389(2018)283-305 | 10.1016/j.aop.2017.12.012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates the geometry of static traversable wormhole through
Noether symmetry approach in $f(R)$ gravity. We take perfect fluid distribution
and formulate symmetry generators with associated conserved quantities
corresponding to general form, power-law and exponential $f(R)$ models. In each
case, we ev... | [
{
"created": "Fri, 12 Jan 2018 03:30:07 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Sharif",
"M.",
""
],
[
"Nawazish",
"Iqra",
""
]
] | This paper investigates the geometry of static traversable wormhole through Noether symmetry approach in $f(R)$ gravity. We take perfect fluid distribution and formulate symmetry generators with associated conserved quantities corresponding to general form, power-law and exponential $f(R)$ models. In each case, we eval... |
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