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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2206.05132 | Khadijeh Jafarzade | S. H. Hendi, Kh. Jafarzade, B. Eslam Panah | Black holes in dRGT massive gravity with the signature of EHT
observations of M87* | 23 pages, 6 figures | JCAP 02 (2023) 022 | 10.1088/1475-7516/2023/02/022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent Event Horizon Telescope (EHT) observations of the M87* have led to
a surge of interest in studying the shadow of black holes. Besides,
investigation of time evolution and lifetime of black holes helps us to
veto/restrict some theoretical models in gravitating systems. Motivated by such
exciting properties,... | [
{
"created": "Fri, 10 Jun 2022 14:14:00 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Sep 2022 04:10:25 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Feb 2023 05:54:16 GMT",
"version": "v3"
}
] | 2023-02-14 | [
[
"Hendi",
"S. H.",
""
],
[
"Jafarzade",
"Kh.",
""
],
[
"Panah",
"B. Eslam",
""
]
] | The recent Event Horizon Telescope (EHT) observations of the M87* have led to a surge of interest in studying the shadow of black holes. Besides, investigation of time evolution and lifetime of black holes helps us to veto/restrict some theoretical models in gravitating systems. Motivated by such exciting properties, w... |
0802.0880 | William Donnelly | William Donnelly | Entanglement Entropy in Loop Quantum Gravity | 4 pages, no figures | Phys.Rev.D77:104006,2008 | 10.1103/PhysRevD.77.104006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The entanglement entropy between quantum fields inside and outside a black
hole horizon is a promising candidate for the microscopic origin of black hole
entropy. We show that the entanglement entropy may be defined in loop quantum
gravity, and compute its value for spin network states. The entanglement
entropy for a... | [
{
"created": "Wed, 6 Feb 2008 21:44:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Donnelly",
"William",
""
]
] | The entanglement entropy between quantum fields inside and outside a black hole horizon is a promising candidate for the microscopic origin of black hole entropy. We show that the entanglement entropy may be defined in loop quantum gravity, and compute its value for spin network states. The entanglement entropy for an ... |
1908.02697 | Robert Buckley | Robert G. Buckley and Eric M. Schlegel | Physical geometry of the quasispherical Szekeres models | 26 pages, 15 figures. Submitted to Phys. Rev. D | Phys. Rev. D 101, 023511 (2020) | 10.1103/PhysRevD.101.023511 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quasispherical Szekeres metric is an exact solution to Einstein's
equations describing an inhomogeneous and anisotropic cosmology. Though its
governing equations are well-known, there are subtle, often-overlooked details
in how the model's functions relate to its physical layout, including the
shapes and relative... | [
{
"created": "Wed, 7 Aug 2019 16:08:54 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2019 14:57:44 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Feb 2020 20:55:13 GMT",
"version": "v3"
}
] | 2020-02-19 | [
[
"Buckley",
"Robert G.",
""
],
[
"Schlegel",
"Eric M.",
""
]
] | The quasispherical Szekeres metric is an exact solution to Einstein's equations describing an inhomogeneous and anisotropic cosmology. Though its governing equations are well-known, there are subtle, often-overlooked details in how the model's functions relate to its physical layout, including the shapes and relative p... |
2406.09251 | Valerio Faraoni | Numa Karolinski and Valerio Faraoni | The Tolman-Ehrenfest criterion of thermal equilibrium in scalar-tensor
gravity | 9 pages, latex | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Tolman-Ehrenfest criterion for the thermal equilibrium of a fluid at rest
in a static general-relativistic geometry is generalized to scalar-tensor
gravity. The gravitational scalar field, which fixes the strength of the
effective gravitational coupling, plays a role in determining thermal
equilibrium. As a resul... | [
{
"created": "Thu, 13 Jun 2024 15:55:43 GMT",
"version": "v1"
}
] | 2024-06-14 | [
[
"Karolinski",
"Numa",
""
],
[
"Faraoni",
"Valerio",
""
]
] | The Tolman-Ehrenfest criterion for the thermal equilibrium of a fluid at rest in a static general-relativistic geometry is generalized to scalar-tensor gravity. The gravitational scalar field, which fixes the strength of the effective gravitational coupling, plays a role in determining thermal equilibrium. As a result,... |
0904.3224 | Steven Willison | Steven Willison | Lovelock gravity and Weyl's tube formula | 16 pages, 1 figure, RevTex. Version 2: references and a few
additional comments added | Phys.Rev.D80:064018,2009 | 10.1103/PhysRevD.80.064018 | CECS-PHY-09/04 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In four space-time dimensions, there are good theoretical reasons for
believing that General Relativity is the correct geometrical theory of gravity,
at least at the classical level. If one admits the possibility of extra
space-time dimensions, what would we expect classical gravity to be like? It is
often stated tha... | [
{
"created": "Tue, 21 Apr 2009 16:43:22 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2009 16:49:33 GMT",
"version": "v2"
}
] | 2009-10-20 | [
[
"Willison",
"Steven",
""
]
] | In four space-time dimensions, there are good theoretical reasons for believing that General Relativity is the correct geometrical theory of gravity, at least at the classical level. If one admits the possibility of extra space-time dimensions, what would we expect classical gravity to be like? It is often stated that ... |
1307.5499 | Marcus Khuri | Marcus A. Khuri, Gilbert Weinstein | Rigidity in the Positive Mass Theorem with Charge | 12 pages; final version | J. Math. Phys., 54 (2013), 092501 | 10.1063/1.4820469 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show how a natural coupling of the Dirac equation with the
generalized Jang equation, leads to a proof of the rigidity statement in the
positive mass theorem with charge, without the maximal slicing condition,
provided a solution to the coupled system exists.
| [
{
"created": "Sun, 21 Jul 2013 06:48:50 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2013 02:21:41 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Aug 2013 13:27:56 GMT",
"version": "v3"
},
{
"created": "Sat, 14 Sep 2013 22:57:40 GMT",
"version": "v4"
}
] | 2013-09-18 | [
[
"Khuri",
"Marcus A.",
""
],
[
"Weinstein",
"Gilbert",
""
]
] | In this paper we show how a natural coupling of the Dirac equation with the generalized Jang equation, leads to a proof of the rigidity statement in the positive mass theorem with charge, without the maximal slicing condition, provided a solution to the coupled system exists. |
1408.5581 | Eugen Radu | Yves Brihaye, Carlos Herdeiro and Eugen Radu | Myers-Perry black holes with scalar hair and a mass gap | 11 pages, 6 figures | null | 10.1016/j.physletb.2014.10.019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a family of asymptotically flat, rotating black holes with
scalar hair and a regular horizon, within five dimensional Einstein's gravity
minimally coupled to a complex, massive scalar field doublet. These solutions
are supported by rotation and have no static limit. They are described by their
mass $M$, ... | [
{
"created": "Sun, 24 Aug 2014 08:52:10 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Brihaye",
"Yves",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Radu",
"Eugen",
""
]
] | We construct a family of asymptotically flat, rotating black holes with scalar hair and a regular horizon, within five dimensional Einstein's gravity minimally coupled to a complex, massive scalar field doublet. These solutions are supported by rotation and have no static limit. They are described by their mass $M$, tw... |
2008.13318 | Zi-Yu Tang | Zi-Yu Tang, Bin Wang, Thanasis Karakasis and Eleftherios
Papantonopoulos | Curvature Scalarization of Black Holes in f(R) Gravity | 18 pages, 12 figures | Phys. Rev. D 104, 064017 (2021) | 10.1103/PhysRevD.104.064017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider f(R) gravity theories in the presence of a scalar field minimally
coupled to gravity with a self-interacting potential. When the scalar field
backreacts to the metric we find at large distances scalarized
Schwarzschild-AdS and Schwarzschild-AdS-like black hole solutions. At small
distances due to strong c... | [
{
"created": "Mon, 31 Aug 2020 02:18:08 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Sep 2020 10:24:35 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Oct 2020 10:57:31 GMT",
"version": "v3"
}
] | 2021-09-15 | [
[
"Tang",
"Zi-Yu",
""
],
[
"Wang",
"Bin",
""
],
[
"Karakasis",
"Thanasis",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | We consider f(R) gravity theories in the presence of a scalar field minimally coupled to gravity with a self-interacting potential. When the scalar field backreacts to the metric we find at large distances scalarized Schwarzschild-AdS and Schwarzschild-AdS-like black hole solutions. At small distances due to strong cur... |
2110.13565 | Wenyi Wang | Wenyi Wang, Hua Chen, Taishi Katsuragawa | Static and spherically symmetric solutions in f(Q) gravity | 7 pages,version to appear in Physical Review D | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | f(Q) gravity is the extension of symmetric teleparallel general relativity
(STGR), in which both curvature and torsion vanish, and gravity is attributed
to nonmetricity. This work performs theoretical analyses of static and
spherically symmetric solutions with an anisotropic fluid for general f(Q)
gravity. We find th... | [
{
"created": "Tue, 26 Oct 2021 10:50:15 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2022 10:52:25 GMT",
"version": "v2"
}
] | 2022-02-10 | [
[
"Wang",
"Wenyi",
""
],
[
"Chen",
"Hua",
""
],
[
"Katsuragawa",
"Taishi",
""
]
] | f(Q) gravity is the extension of symmetric teleparallel general relativity (STGR), in which both curvature and torsion vanish, and gravity is attributed to nonmetricity. This work performs theoretical analyses of static and spherically symmetric solutions with an anisotropic fluid for general f(Q) gravity. We find that... |
1505.00743 | Supriya Pan | Supriya Pan and Subenoy Chakraborty | A Cosmological Study in Massive Gravity theory | 21 Pages, 5 figures, Published version | Annals of Phys, 360 (2015) 180-193 | 10.1016/j.aop.2015.04.003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed study of the various cosmological aspects in massive gravity
theory has been presented in the present work. For the homogeneous and
isotropic FLRW model, the deceleration parameter has been evaluated, and, it
has been examined whether there is any transition from deceleration to
acceleration in recent past... | [
{
"created": "Thu, 30 Apr 2015 12:28:19 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2015 13:55:05 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Pan",
"Supriya",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | A detailed study of the various cosmological aspects in massive gravity theory has been presented in the present work. For the homogeneous and isotropic FLRW model, the deceleration parameter has been evaluated, and, it has been examined whether there is any transition from deceleration to acceleration in recent past, ... |
gr-qc/9809077 | K. S. Virbhadra | K. S. Virbhadra (University of Cape Town) | Naked singularities and Seifert's conjecture | RevTex, no figures, new results included, published in Physical
Review D 60, 104041 (1999) | Phys.Rev. D60 (1999) 104041 | 10.1103/PhysRevD.60.104041 | null | gr-qc astro-ph hep-th | null | It is shown that for a general nonstatic spherically symmetric metric of the
Kerr-Schild class several energy-momentum complexes give the same energy
distribution as in the Penrose prescription, obtained by Tod. This result is
useful for investigating the Seifert conjecture for naked singularities. The
naked singular... | [
{
"created": "Mon, 28 Sep 1998 15:21:05 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jan 2000 14:03:07 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Virbhadra",
"K. S.",
"",
"University of Cape Town"
]
] | It is shown that for a general nonstatic spherically symmetric metric of the Kerr-Schild class several energy-momentum complexes give the same energy distribution as in the Penrose prescription, obtained by Tod. This result is useful for investigating the Seifert conjecture for naked singularities. The naked singularit... |
1604.05547 | Chiang-Mei Chen | James M. Nester, Chiang-Mei Chen | Gravity: a gauge theory perspective | 10 pages, contribution to the Proceedings of the Second LeCosPA
Symposium "Everything about Gravity", Taipei, 14-18 Dec., 2015 | null | 10.1142/S0218271816450024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of a generally covariant theory is under-determined. One
hundred years ago such dynamics had never before been considered; its
ramifications were perplexing, its future important role for all the
fundamental interactions under the name gauge principle could not be foreseen.
We recount some history regar... | [
{
"created": "Tue, 19 Apr 2016 12:52:49 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Nester",
"James M.",
""
],
[
"Chen",
"Chiang-Mei",
""
]
] | The evolution of a generally covariant theory is under-determined. One hundred years ago such dynamics had never before been considered; its ramifications were perplexing, its future important role for all the fundamental interactions under the name gauge principle could not be foreseen. We recount some history regardi... |
1408.4358 | Jose Luis Flores | I.P. Costa e Silva, J.L. Flores | Lightlike sets with applications to the rigidity of null geodesic
incompleteness | 23 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An important, if relatively less well known aspect of the singularity
theorems in Lorentzian Geometry is to understand how their conclusions fare
upon weakening or suppression of one or more of their hypotheses. Then,
theorems with modified concusions may arise, showing that those conclusions
will fail only in specia... | [
{
"created": "Tue, 19 Aug 2014 15:04:45 GMT",
"version": "v1"
}
] | 2014-08-20 | [
[
"Silva",
"I. P. Costa e",
""
],
[
"Flores",
"J. L.",
""
]
] | An important, if relatively less well known aspect of the singularity theorems in Lorentzian Geometry is to understand how their conclusions fare upon weakening or suppression of one or more of their hypotheses. Then, theorems with modified concusions may arise, showing that those conclusions will fail only in special ... |
2404.11468 | Luca Guido Molinari | Carlo Alberto Mantica and Luca Guido Molinari | Conformal Killing cosmology -- Geometry, dark sector, growth of
structures, and big rip | 20 pages, 6 figures. Introduction reviewed, with references. Section
on H(z) and datasets reviewed with improved figures, evolution of dark energy
density and pressure, future singularities | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce Sinyukov-like tensors, a special kind of conformal Killing
tensors. In Robertson-Walker space-times they have the perfect-fluid form and
only depend on two constants and the scale factor. They are the candidate for
the dark term of the newly proposed Conformal Killing Gravity, by Harada. In
addition to o... | [
{
"created": "Wed, 17 Apr 2024 15:16:50 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2024 14:28:37 GMT",
"version": "v2"
},
{
"created": "Thu, 9 May 2024 13:04:54 GMT",
"version": "v3"
},
{
"created": "Sat, 25 May 2024 07:09:47 GMT",
"version": "v4"
}
] | 2024-05-28 | [
[
"Mantica",
"Carlo Alberto",
""
],
[
"Molinari",
"Luca Guido",
""
]
] | We introduce Sinyukov-like tensors, a special kind of conformal Killing tensors. In Robertson-Walker space-times they have the perfect-fluid form and only depend on two constants and the scale factor. They are the candidate for the dark term of the newly proposed Conformal Killing Gravity, by Harada. In addition to ord... |
2210.16339 | Andrew Svesko | Damien A. Easson, Tucker Manton and Andrew Svesko | Einstein-Maxwell theory and the Weyl double copy | 25 pages + an appendix | null | 10.1103/PhysRevD.107.044063 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Weyl double copy relates vacuum solutions in general relativity to
Abelian gauge fields in Minkowski spacetime. In a previous work, we showed how
the Weyl double copy can be extended to provide a treatment of external
gravitational sources consistent with the classical Kerr-Schild double copy.
Using this generali... | [
{
"created": "Fri, 28 Oct 2022 18:01:04 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Easson",
"Damien A.",
""
],
[
"Manton",
"Tucker",
""
],
[
"Svesko",
"Andrew",
""
]
] | The Weyl double copy relates vacuum solutions in general relativity to Abelian gauge fields in Minkowski spacetime. In a previous work, we showed how the Weyl double copy can be extended to provide a treatment of external gravitational sources consistent with the classical Kerr-Schild double copy. Using this generaliza... |
1904.06558 | Valentin Boyanov | Carlos Barcel\'o, Valentin Boyanov, Ra\'ul Carballo-Rubio, Luis J.
Garay | Semiclassical gravity effects near horizon formation | 41 pages, 19 figures, v2: added one new figure and minor changes in
text to match published version | Class. Quantum Grav., vol. 36, no. 16, 2019 | 10.1088/1361-6382/ab2e43 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the magnitude of semiclassical gravity effects near the formation of
a black-hole horizon in spherically-symmetric spacetimes. As a probe for these
effects we use a quantised massless scalar field. Specifically, we calculate
two quantities derived from it: the renormalised stress-energy tensor (a
measure of ... | [
{
"created": "Sat, 13 Apr 2019 14:46:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Nov 2019 10:58:24 GMT",
"version": "v2"
}
] | 2019-11-07 | [
[
"Barceló",
"Carlos",
""
],
[
"Boyanov",
"Valentin",
""
],
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Garay",
"Luis J.",
""
]
] | We study the magnitude of semiclassical gravity effects near the formation of a black-hole horizon in spherically-symmetric spacetimes. As a probe for these effects we use a quantised massless scalar field. Specifically, we calculate two quantities derived from it: the renormalised stress-energy tensor (a measure of ho... |
gr-qc/0202047 | Henrique P. de Oliveira | H. P. de Oliveira, A. M. Ozorio de Almeida, I. Dami\~ao Soares and E.
V. Tonini | Homoclinic chaos in the dynamics of a general Bianchi IX model | 11 pages, 6 ps figures. Accepted for publication in Phys. Rev. D | Phys.Rev. D65 (2002) 083511 | 10.1103/PhysRevD.65.083511 | null | gr-qc | null | The dynamics of a general Bianchi IX model with three scale factors is
examined. The matter content of the model is assumed to be comoving dust plus a
positive cosmological constant. The model presents a critical point of
saddle-center-center type in the finite region of phase space. This critical
point engenders in ... | [
{
"created": "Thu, 14 Feb 2002 10:12:34 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"de Oliveira",
"H. P.",
""
],
[
"de Almeida",
"A. M. Ozorio",
""
],
[
"Soares",
"I. Damião",
""
],
[
"Tonini",
"E. V.",
""
]
] | The dynamics of a general Bianchi IX model with three scale factors is examined. The matter content of the model is assumed to be comoving dust plus a positive cosmological constant. The model presents a critical point of saddle-center-center type in the finite region of phase space. This critical point engenders in th... |
2403.05642 | Nishad Muhammed | Nishad Muhammed, Matthew D. Duez, Pavan Chawhan, Noora Ghadiri, Luisa
T. Buchman, Francois Foucart, Patrick Chi-Kit Cheong, Lawrence E. Kidder,
Harald P. Pfeiffer and Mark A. Scheel | Stability of hypermassive neutron stars with realistic rotation and
entropy profiles | 12 pages, 9 figures | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Binary neutron star mergers produce massive, hot, rapidly differentially
rotating neutron star remnants; electromagnetic and gravitational wave signals
associated with the subsequent evolution depend on the stability of these
remnants. Stability of relativistic stars has previously been studied for
uniform rotation a... | [
{
"created": "Fri, 8 Mar 2024 19:29:09 GMT",
"version": "v1"
}
] | 2024-03-12 | [
[
"Muhammed",
"Nishad",
""
],
[
"Duez",
"Matthew D.",
""
],
[
"Chawhan",
"Pavan",
""
],
[
"Ghadiri",
"Noora",
""
],
[
"Buchman",
"Luisa T.",
""
],
[
"Foucart",
"Francois",
""
],
[
"Cheong",
"Patrick Chi-Kit",
... | Binary neutron star mergers produce massive, hot, rapidly differentially rotating neutron star remnants; electromagnetic and gravitational wave signals associated with the subsequent evolution depend on the stability of these remnants. Stability of relativistic stars has previously been studied for uniform rotation and... |
1801.00768 | Mehdi Assanioussi | Mehdi Assanioussi, Andrea Dapor, Klaus Liegener, Tomasz Paw{\l}owski | Emergent de Sitter epoch of the quantum Cosmos | 6 pages, 2 figures, revised version accepted for publication in
Phys.Rev.Lett., with the addition of fig.2 and subsequent comments | Phys. Rev. Lett. 121, 081303 (2018) | 10.1103/PhysRevLett.121.081303 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum nature of the Big Bang is reexamined in the framework of Loop
Quantum Cosmology. The strict application of a regularization procedure to the
Hamiltonian, originally developed for the Hamiltonian in loop quantum gravity,
leads to a qualitative modification of the bounce paradigm. Quantum gravity
effects st... | [
{
"created": "Tue, 2 Jan 2018 18:46:57 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Aug 2018 17:10:24 GMT",
"version": "v2"
}
] | 2018-08-29 | [
[
"Assanioussi",
"Mehdi",
""
],
[
"Dapor",
"Andrea",
""
],
[
"Liegener",
"Klaus",
""
],
[
"Pawłowski",
"Tomasz",
""
]
] | The quantum nature of the Big Bang is reexamined in the framework of Loop Quantum Cosmology. The strict application of a regularization procedure to the Hamiltonian, originally developed for the Hamiltonian in loop quantum gravity, leads to a qualitative modification of the bounce paradigm. Quantum gravity effects stil... |
2402.13951 | J\'unior Diniz Toniato | J\'unior D. Toniato and Mart\'in G. Richarte | A Post-Newtonian Analysis of Regularized 4D-EGB Theory: Complete Set of
PPN Parameters and Observational Constraints | 14 pages, 2 tables, 1 appendix. References added. Submitted to PRD | Phys. Rev. D 109, 104068 (2024) | 10.1103/PhysRevD.109.104068 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We performed a post-Newtonian analysis of the regularized four-dimensional
Einstein-Gauss-Bonnet gravitational theory (4D-EGB). The resulting metric
differs from the classical parametrized post-Newtonian (PPN) formalism in that
a new gravitational potential arises from the integration of the approximate
field equatio... | [
{
"created": "Wed, 21 Feb 2024 17:29:05 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2024 19:05:41 GMT",
"version": "v2"
}
] | 2024-06-25 | [
[
"Toniato",
"Júnior D.",
""
],
[
"Richarte",
"Martín G.",
""
]
] | We performed a post-Newtonian analysis of the regularized four-dimensional Einstein-Gauss-Bonnet gravitational theory (4D-EGB). The resulting metric differs from the classical parametrized post-Newtonian (PPN) formalism in that a new gravitational potential arises from the integration of the approximate field equations... |
0908.3227 | Kazuhiro Agatsuma | Kazuhiro Agatsuma, Takashi Uchiyama, Kazuhiro Yamamoto, Masatake
Ohashi, Seiji Kawamura, Shinji Miyoki, Osamu Miyakawa, Souichi Telada and
Kazuaki Kuroda | Direct Measurement of Thermal Fluctuation of High-Q Pendulum | 10 pages, 4 figures | PRL 104, 040602 (2010) | 10.1103/PhysRevLett.104.040602 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We achieved for the first time a direct measurement of the thermal
fluctuation of a pendulum in an off-resonant region using a laser
interferometric gravitational wave detector. These measurements have been well
identified for over one decade by an agreement with a theoretical prediction,
which was derived by a fluct... | [
{
"created": "Sun, 23 Aug 2009 06:17:39 GMT",
"version": "v1"
}
] | 2014-01-28 | [
[
"Agatsuma",
"Kazuhiro",
""
],
[
"Uchiyama",
"Takashi",
""
],
[
"Yamamoto",
"Kazuhiro",
""
],
[
"Ohashi",
"Masatake",
""
],
[
"Kawamura",
"Seiji",
""
],
[
"Miyoki",
"Shinji",
""
],
[
"Miyakawa",
"Osamu",
""
... | We achieved for the first time a direct measurement of the thermal fluctuation of a pendulum in an off-resonant region using a laser interferometric gravitational wave detector. These measurements have been well identified for over one decade by an agreement with a theoretical prediction, which was derived by a fluctua... |
1206.5797 | Hossein Farajollahi | H. Farajollahi, A. Salehi | Chameleon gravity on cosmological scales | 7 pages, 11 figures | Phys. Rev. D 85, 083514 (2012) | 10.1103/PhysRevD.85.083514 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In conventional approach to the chameleon mechanism, by assuming a static and
spherically symmetric solutions in which matter density and chameleon field are
given by $\rho=\rho(r)$ and $\phi=\phi(r)$, it has been shown that mass of
chameleon field is matter density-dependent. In regions of high matter density
such a... | [
{
"created": "Mon, 25 Jun 2012 14:22:49 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Farajollahi",
"H.",
""
],
[
"Salehi",
"A.",
""
]
] | In conventional approach to the chameleon mechanism, by assuming a static and spherically symmetric solutions in which matter density and chameleon field are given by $\rho=\rho(r)$ and $\phi=\phi(r)$, it has been shown that mass of chameleon field is matter density-dependent. In regions of high matter density such as ... |
2106.01412 | Ramin G. Daghigh | Ramin G. Daghigh and Michael D. Green | Gravitational and electromagnetic radiation from an electrically charged
black hole in general nonlinear electrodynamics | 25 pages. Minor corrections are made and one figure is added. The
paper is going to be published in Phys. Rev. D soon | null | 10.1103/PhysRevD.105.024055 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We derive the equations for the odd and even parity perturbations of coupled
electromagnetic and gravitational fields of a black hole with an electric
charge within the context of general nonlinear electrodynamics. The Lagrangian
density is a generic function of the Lorentz invariant scalar quantities of the
electrom... | [
{
"created": "Wed, 2 Jun 2021 18:30:01 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Aug 2021 22:01:50 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Nov 2021 19:20:07 GMT",
"version": "v3"
},
{
"created": "Tue, 4 Jan 2022 21:39:10 GMT",
"version": "v4"
}
] | 2022-02-02 | [
[
"Daghigh",
"Ramin G.",
""
],
[
"Green",
"Michael D.",
""
]
] | We derive the equations for the odd and even parity perturbations of coupled electromagnetic and gravitational fields of a black hole with an electric charge within the context of general nonlinear electrodynamics. The Lagrangian density is a generic function of the Lorentz invariant scalar quantities of the electromag... |
gr-qc/9911083 | Julia Kopeikina | Sergei M. Kopeikin (Dept. of Phys. and Astron., Univ.
Missouri-Columbia) | Lorentz Covariant Theory of Precise Doppler Measurements | 4 pages, the afternoon talk at Journees Relativistes 1999, Weimar,
Germany, September 1999 | null | null | null | gr-qc astro-ph physics.space-ph | null | The Lorentz covariant theory of precise Doppler measurements (PDM) based on
the retarded Li\'{e}nard-Wiechert solution of the Einstein equations is
described. An exact solution of equations of light propagation in the field of
arbitrary moving bodies, which drastically extends the range of applicability
of the new th... | [
{
"created": "Mon, 22 Nov 1999 13:54:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kopeikin",
"Sergei M.",
"",
"Dept. of Phys. and Astron., Univ.\n Missouri-Columbia"
]
] | The Lorentz covariant theory of precise Doppler measurements (PDM) based on the retarded Li\'{e}nard-Wiechert solution of the Einstein equations is described. An exact solution of equations of light propagation in the field of arbitrary moving bodies, which drastically extends the range of applicability of the new theo... |
1203.3703 | Gabriel Pascu | Gabriel Pascu | New Spherical Scalar Modes on the de Sitter Expanding Universe | postprint that reflects the changes made after the revision process,
and subsequent publishing | Mod. Phys. Lett. A, vol. 27, No. 23 (2012) 1250124 | 10.1142/S0217732312501246 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New spherical scalar modes on the expanding part of Sitter spacetime,
eigenfunctions of a conserved Hamiltonian-like operator are found by solving
the Klein-Gordon equation in the appropriate coordinate chart, with the help of
a time evolution picture technique specially developed for spatially flat FLRW
charts. Tran... | [
{
"created": "Fri, 16 Mar 2012 13:42:12 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2012 19:23:13 GMT",
"version": "v2"
}
] | 2012-09-24 | [
[
"Pascu",
"Gabriel",
""
]
] | New spherical scalar modes on the expanding part of Sitter spacetime, eigenfunctions of a conserved Hamiltonian-like operator are found by solving the Klein-Gordon equation in the appropriate coordinate chart, with the help of a time evolution picture technique specially developed for spatially flat FLRW charts. Transi... |
1201.1298 | Andrew Lundgren | Andrew P. Lundgren, Mihai Bondarescu, Ruxandra Bondarescu | Depressing de Sitter in the Frozen Future | 5 pages, no figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we focus on the gravitational thermodynamics of the far future.
Cosmological observations suggest that most matter will be diluted away by the
cosmological expansion, with the rest collapsing into supermassive black holes.
The likely future state of our local universe is a supermassive black hole
slowly... | [
{
"created": "Thu, 5 Jan 2012 21:01:58 GMT",
"version": "v1"
}
] | 2012-01-09 | [
[
"Lundgren",
"Andrew P.",
""
],
[
"Bondarescu",
"Mihai",
""
],
[
"Bondarescu",
"Ruxandra",
""
]
] | In this paper we focus on the gravitational thermodynamics of the far future. Cosmological observations suggest that most matter will be diluted away by the cosmological expansion, with the rest collapsing into supermassive black holes. The likely future state of our local universe is a supermassive black hole slowly e... |
1405.0249 | Petr Horava | Petr Horava, Arif Mohd, Charles M. Melby-Thompson, Peter Shawhan | GR 20 Parallel Session A3: Modified Gravity | 12 pages, 2 figures | Gen. Rel. Grav. 46 (2014) 1720 | 10.1007/s10714-014-1720-4 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the contribution representing Parallel Session A3, on Modified
Gravity, in the Proceedings of the GR 20 Conference (July 2013, Warszawa,
Poland). It consists of three invited chapters, selected by the Session Chair
(P.H.) to represent the broad spectrum of topics discussed in the Session,
which ranged from th... | [
{
"created": "Thu, 1 May 2014 18:47:54 GMT",
"version": "v1"
}
] | 2014-05-02 | [
[
"Horava",
"Petr",
""
],
[
"Mohd",
"Arif",
""
],
[
"Melby-Thompson",
"Charles M.",
""
],
[
"Shawhan",
"Peter",
""
]
] | This is the contribution representing Parallel Session A3, on Modified Gravity, in the Proceedings of the GR 20 Conference (July 2013, Warszawa, Poland). It consists of three invited chapters, selected by the Session Chair (P.H.) to represent the broad spectrum of topics discussed in the Session, which ranged from theo... |
1401.1189 | Vincenzo Vitagliano | Valerio Faraoni, Vincenzo Vitagliano | Horizon thermodynamics and spacetime mappings | 12 pages | null | 10.1103/PhysRevD.89.064015 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When black holes are dynamical, event horizons are replaced by apparent and
trapping horizons. Conformal and Kerr-Schild transformations are widely used in
relation with dynamical black holes and we study the behaviour under such
transformations of quantities related to the thermodynamics of these horizons,
such as t... | [
{
"created": "Mon, 6 Jan 2014 20:24:36 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Faraoni",
"Valerio",
""
],
[
"Vitagliano",
"Vincenzo",
""
]
] | When black holes are dynamical, event horizons are replaced by apparent and trapping horizons. Conformal and Kerr-Schild transformations are widely used in relation with dynamical black holes and we study the behaviour under such transformations of quantities related to the thermodynamics of these horizons, such as the... |
gr-qc/9705070 | Matt Visser | Matt Visser (Washington University) | General Relativistic Energy Conditions: The Hubble expansion in the
epoch of galaxy formation | 25 pages; plain LaTeX; uses epsf.sty; three encapsulated postscript
figures. A brief summary of these ideas was published in Science 276 (4 April
1997) 88--90 | Phys.Rev. D56 (1997) 7578-7587 | 10.1103/PhysRevD.56.7578 | null | gr-qc | null | The energy conditions of Einstein gravity (classical general relativity) are
designed to extract as much information as possible from classical general
relativity without enforcing a particular equation of state for the
stress-energy. This systematic avoidance of the need to specify a particular
equation of state is ... | [
{
"created": "Mon, 26 May 1997 21:03:15 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Visser",
"Matt",
"",
"Washington University"
]
] | The energy conditions of Einstein gravity (classical general relativity) are designed to extract as much information as possible from classical general relativity without enforcing a particular equation of state for the stress-energy. This systematic avoidance of the need to specify a particular equation of state is pa... |
gr-qc/0010012 | Fatimah Shojai | Fatimah Shojai, Ali Shojai | Nonminimal Scalar-Tensor Theories and Quantum Gravity | 15 pages | Int.J.Mod.Phys. A15 (2000) 1859-1868 | 10.1142/S0217751X0000080X | null | gr-qc | null | Recentely, it is shown that the quantum effects of matter determine the
conformal degree of freedom of the space-time metric. This was done in the
framework of a scalar-tensor theory with one scalar field. A point with that
theory is that the form of quantum potential is preassumed. Here we present a
scalar-tensor th... | [
{
"created": "Wed, 4 Oct 2000 10:44:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Shojai",
"Fatimah",
""
],
[
"Shojai",
"Ali",
""
]
] | Recentely, it is shown that the quantum effects of matter determine the conformal degree of freedom of the space-time metric. This was done in the framework of a scalar-tensor theory with one scalar field. A point with that theory is that the form of quantum potential is preassumed. Here we present a scalar-tensor theo... |
gr-qc/9407031 | Friedrich Wilhelm Hehl | E.W. Mielke, Y.N. Obukhov, and F.W. Hehl | Yang--Mills Configurations from 3D Riemann--Cartan Geometry | 14 pages, preprint Cologne-thp-1994-h10 | Phys.Lett. A192 (1994) 153-162 | 10.1016/0375-9601(94)90237-2 | null | gr-qc hep-th | null | Recently, the {\it spacelike} part of the $SU(2)$ Yang--Mills equations has
been identified with geometrical objects of a three--dimensional space of
constant Riemann--Cartan curvature. We give a concise derivation of this
Ashtekar type (``inverse Kaluza--Klein") {\it mapping} by employing a
$(3+1)$--decomposition of... | [
{
"created": "Thu, 21 Jul 1994 20:32:04 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Mielke",
"E. W.",
""
],
[
"Obukhov",
"Y. N.",
""
],
[
"Hehl",
"F. W.",
""
]
] | Recently, the {\it spacelike} part of the $SU(2)$ Yang--Mills equations has been identified with geometrical objects of a three--dimensional space of constant Riemann--Cartan curvature. We give a concise derivation of this Ashtekar type (``inverse Kaluza--Klein") {\it mapping} by employing a $(3+1)$--decomposition of {... |
gr-qc/0111111 | Matt Visser | Matt Visser (Washington University in Saint Louis) Carlos Barcelo
(Washington University in Saint Louis) Stefano Liberati (U of Maryland) | Analogue models of and for gravity | Plain LaTeX2E; 20 page mini-survey; one eps figure. Plenary talk at
the Australasian Relativity Conference (Perth, July 2001). Proceedings to
appear in ``General Relativity and Gravitation'' | Gen.Rel.Grav. 34 (2002) 1719-1734 | null | null | gr-qc | null | Condensed matter systems, such as acoustics in flowing fluids, light in
moving dielectrics, or quasiparticles in a moving superfluid, can be used to
mimic aspects of general relativity. More precisely these systems (and others)
provide experimentally accessible models of curved-space quantum field theory.
As such the... | [
{
"created": "Fri, 30 Nov 2001 03:06:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Visser",
"Matt",
"",
"Washington University in Saint Louis"
],
[
"Barcelo",
"Carlos",
"",
"Washington University in Saint Louis"
],
[
"Liberati",
"Stefano",
"",
"U of Maryland"
]
] | Condensed matter systems, such as acoustics in flowing fluids, light in moving dielectrics, or quasiparticles in a moving superfluid, can be used to mimic aspects of general relativity. More precisely these systems (and others) provide experimentally accessible models of curved-space quantum field theory. As such they ... |
1506.06358 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | Lemaitre model and cosmic mass | 10 pages, no figures, to appear in Gen. Rel. Gravit | null | 10.1007/s10714-015-1926-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass of a sphere of simmetry in the Lemaitre universe is discussed using
the Hawking-Hayward quasi-local energy and clarifying existing ambiguities. A
covariantly conserved current introduced by Cahill and McVittie is shown to be
a multiple of the Kodama energy current.
| [
{
"created": "Sun, 21 Jun 2015 12:43:20 GMT",
"version": "v1"
}
] | 2015-07-15 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | The mass of a sphere of simmetry in the Lemaitre universe is discussed using the Hawking-Hayward quasi-local energy and clarifying existing ambiguities. A covariantly conserved current introduced by Cahill and McVittie is shown to be a multiple of the Kodama energy current. |
2109.06425 | Hao Tian Sun | Rong-Gen Cai, Li Li, Hao-Tian Sun | Instability in charged Gauss-Bonnet-de Sitter black holes | 13 pages + appendix, 13 figures; title changed, matches published
version in PRD | Phys. Rev. D 105, 064032 (2022) | 10.1103/PhysRevD.105.064032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the instability of the charged Gauss-Bonnet de Sitter black holes
under gravito-electromagnetic perturbations. We adopt two criteria to search
for an instability of the scalar type perturbations, including the local
instability criterion based on the $AdS_2$ Breitenl\"{o}hner-Freedman (BF)
bound at extremali... | [
{
"created": "Tue, 14 Sep 2021 04:22:45 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2022 08:42:34 GMT",
"version": "v2"
}
] | 2022-03-22 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Li",
"Li",
""
],
[
"Sun",
"Hao-Tian",
""
]
] | We study the instability of the charged Gauss-Bonnet de Sitter black holes under gravito-electromagnetic perturbations. We adopt two criteria to search for an instability of the scalar type perturbations, including the local instability criterion based on the $AdS_2$ Breitenl\"{o}hner-Freedman (BF) bound at extremality... |
gr-qc/9405019 | U. Bleyer | U. Bleyer, A. Zhuk | Classical and Quantum Behaviour of Multidimensional Integrable
Cosmologies | 33 pages, 13 figures available on request from ubleyer@aip.de, LaTeX,
Potsdam University, preprint Free University Berlin FUB-HEP/94-1 | null | null | null | gr-qc | null | Multidimensional cosmological models with $n~(n > 1)$ Einstein spaces are
discussed classically and with respect to canonical quantization. These models
are integrable in the case of Ricci flat internal spaces. For negative
curvature of the external space we find exact classical solutions modelling
dynamical as well ... | [
{
"created": "Fri, 6 May 1994 13:41:59 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Bleyer",
"U.",
""
],
[
"Zhuk",
"A.",
""
]
] | Multidimensional cosmological models with $n~(n > 1)$ Einstein spaces are discussed classically and with respect to canonical quantization. These models are integrable in the case of Ricci flat internal spaces. For negative curvature of the external space we find exact classical solutions modelling dynamical as well as... |
0802.1508 | Michele Levi | Michele Levi | Next-to-leading order gravitational spin1-spin2 coupling with
Kaluza-Klein reduction | 12 pages, revtex4-1, 3 figures; v2: reference added; v3: edited,
section 3 elaborated; v4: published | Phys.Rev.D82:064029,2010 | 10.1103/PhysRevD.82.064029 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the recently proposed Kaluza-Klein (KK) reduction over the time
dimension, within an effective field theory (EFT) approach, to calculate the
next to leading order (NLO) gravitational spin1-spin2 interaction between two
spinning compact objects. It is shown here that to NLO in the spin1-spin2
interaction, the r... | [
{
"created": "Mon, 11 Feb 2008 19:32:19 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2008 12:49:48 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Jul 2010 13:10:00 GMT",
"version": "v3"
},
{
"created": "Fri, 24 Sep 2010 22:36:38 GMT",
"version": "v4"
}
] | 2010-12-02 | [
[
"Levi",
"Michele",
""
]
] | We use the recently proposed Kaluza-Klein (KK) reduction over the time dimension, within an effective field theory (EFT) approach, to calculate the next to leading order (NLO) gravitational spin1-spin2 interaction between two spinning compact objects. It is shown here that to NLO in the spin1-spin2 interaction, the red... |
2010.13579 | Pablo Arrighi | Pablo Arrighi and Marios Christodoulou and Am\'elia Durbec | On quantum superpositions of graphs, no-signalling and covariance | null | 2021 Talk https://youtu.be/r5-aWIiWHDk | null | null | gr-qc cs.DM math.DS quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a mathematically and conceptually robust notion of quantum
superpositions of graphs. We argue that, crucially, quantum superpositions of
graphs require node names for their correct alignment, which we demonstrate
through a no-signalling argument. Nevertheless, node names are a fiducial
construct, serving a... | [
{
"created": "Mon, 26 Oct 2020 13:32:16 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Nov 2021 15:05:13 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Mar 2023 23:14:35 GMT",
"version": "v3"
}
] | 2023-03-09 | [
[
"Arrighi",
"Pablo",
""
],
[
"Christodoulou",
"Marios",
""
],
[
"Durbec",
"Amélia",
""
]
] | We provide a mathematically and conceptually robust notion of quantum superpositions of graphs. We argue that, crucially, quantum superpositions of graphs require node names for their correct alignment, which we demonstrate through a no-signalling argument. Nevertheless, node names are a fiducial construct, serving a s... |
2310.20378 | Juan Calderon Bustillo | Ver\'onica Villa-Ortega, Ana Lorenzo-Medina, Juan Calder\'on Bustillo,
Milton Ruiz, Davide Guerra, Pablo Cerd\'a-Duran, Jos\'e A. Font | Self-consistent treatment of thermal effects in neutron-star
post-mergers: observational implications for third-generation
gravitational-wave detectors | 9 pages, 3 Figures | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We assess the impact of accurate, self-consistent modelling of thermal
effects in neutron-star merger remnants in the context of third-generation
gravitational-wave detectors. This is done through the usage, in Bayesian model
selection experiments, of numerical-relativity simulations of binary neutron
star (BNS) merg... | [
{
"created": "Tue, 31 Oct 2023 11:37:23 GMT",
"version": "v1"
}
] | 2023-11-01 | [
[
"Villa-Ortega",
"Verónica",
""
],
[
"Lorenzo-Medina",
"Ana",
""
],
[
"Bustillo",
"Juan Calderón",
""
],
[
"Ruiz",
"Milton",
""
],
[
"Guerra",
"Davide",
""
],
[
"Cerdá-Duran",
"Pablo",
""
],
[
"Font",
"José A.",... | We assess the impact of accurate, self-consistent modelling of thermal effects in neutron-star merger remnants in the context of third-generation gravitational-wave detectors. This is done through the usage, in Bayesian model selection experiments, of numerical-relativity simulations of binary neutron star (BNS) merger... |
1706.01416 | Chris Stevens | Florian Beyer, J\"org Frauendiener, Chris Stevens and Ben Whale | The numerical initial boundary value problem for the generalized
conformal field equations | 27 pages, 7 figures | Phys. Rev. D 96, 084020 (2017) | 10.1103/PhysRevD.96.084020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study a numerical implementation for the initial boundary
value formulation for the generalized conformal field equations. We propose a
formulation which is well suited for the study of the long-time behaviour of
perturbed exact solutions such as a Schwarzschild or even a Kerr black hole. We
describe... | [
{
"created": "Mon, 5 Jun 2017 16:47:42 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2017 06:39:55 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Aug 2017 06:58:18 GMT",
"version": "v3"
},
{
"created": "Mon, 28 Aug 2017 08:38:43 GMT",
"version": "v4"
}
] | 2017-10-18 | [
[
"Beyer",
"Florian",
""
],
[
"Frauendiener",
"Jörg",
""
],
[
"Stevens",
"Chris",
""
],
[
"Whale",
"Ben",
""
]
] | In this paper we study a numerical implementation for the initial boundary value formulation for the generalized conformal field equations. We propose a formulation which is well suited for the study of the long-time behaviour of perturbed exact solutions such as a Schwarzschild or even a Kerr black hole. We describe t... |
2110.02745 | Muhammad Sharif | M. Sharif and Faisal Javed | Stability of $d$-dimensional Gravastars with Variable Equation of State | 21 pages, 12 figures, to appear in Chinese J. Physics | Chinese J. Phys. 77(2022)804-815 | 10.1016/j.cjph.2021.08.024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we are interested to explore stable configurations of
$d$-dimensional gravastars constructed from the interior $d$-dimensional de
Sitter and exterior $d$-dimensional Schwarzschild/Reissner-Nordstr\"om (de
Sitter) black holes through cut and paste approach. We consider the linearized
radial perturbation... | [
{
"created": "Tue, 5 Oct 2021 09:34:53 GMT",
"version": "v1"
}
] | 2022-05-10 | [
[
"Sharif",
"M.",
""
],
[
"Javed",
"Faisal",
""
]
] | In this paper, we are interested to explore stable configurations of $d$-dimensional gravastars constructed from the interior $d$-dimensional de Sitter and exterior $d$-dimensional Schwarzschild/Reissner-Nordstr\"om (de Sitter) black holes through cut and paste approach. We consider the linearized radial perturbation p... |
2003.13847 | Jens Boos | Jens Boos | Angle deficit & non-local gravitoelectromagnetism around a slowly
spinning cosmic string | v2: Matches published version, 10 pages, 1 figure. v1: 9 pages, 1
figure. Essay written for the Gravity Research Foundation 2020 Awards for
Essays on Gravitation, awarded an Honorable Mention | Int. J Mod. Phys. D 29 (2020) no. 14, 2043027 | 10.1142/S0218271820430270 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic strings, as remnants of the symmetry breaking phase in the Early
Universe, may be susceptible to non-local physics. Here we show that the
presence of a Poincar\'e-invariant non-locality -- parametrized by a factor
$\exp(-\Box\ell^2)$ -- regularizes the gravitational field and thereby changes
the properties of ... | [
{
"created": "Mon, 30 Mar 2020 22:26:20 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Feb 2021 01:02:35 GMT",
"version": "v2"
}
] | 2021-02-16 | [
[
"Boos",
"Jens",
""
]
] | Cosmic strings, as remnants of the symmetry breaking phase in the Early Universe, may be susceptible to non-local physics. Here we show that the presence of a Poincar\'e-invariant non-locality -- parametrized by a factor $\exp(-\Box\ell^2)$ -- regularizes the gravitational field and thereby changes the properties of sp... |
1711.00584 | Miko{\l}aj Korzy\'nski | Miko{\l}aj Korzy\'nski and Jaros{\l}aw Kopi\'nski | Optical drift effects in general relativity | Matches the version published in JCAP | JCAP03(2018)012 | 10.1088/1475-7516/2018/03/012 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the question of determining the optical drift effects in general
relativity, i.e. the rate of change of the apparent position, redshift, Jacobi
matrix, angular distance and luminosity distance of a distant object as
registered by an observer in an arbitrary spacetime. We present a fully
relativistic and c... | [
{
"created": "Thu, 2 Nov 2017 01:19:57 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2017 14:33:50 GMT",
"version": "v2"
},
{
"created": "Sat, 9 Dec 2017 01:21:18 GMT",
"version": "v3"
},
{
"created": "Fri, 9 Mar 2018 11:32:16 GMT",
"version": "v4"
}
] | 2018-03-12 | [
[
"Korzyński",
"Mikołaj",
""
],
[
"Kopiński",
"Jarosław",
""
]
] | We consider the question of determining the optical drift effects in general relativity, i.e. the rate of change of the apparent position, redshift, Jacobi matrix, angular distance and luminosity distance of a distant object as registered by an observer in an arbitrary spacetime. We present a fully relativistic and cov... |
1412.4828 | Diego Blas | Diego Blas and Eugene Lim | Phenomenology of theories of gravity without Lorentz invariance: the
preferred frame case | 38 pages, 3 figures; v2 references added | null | 10.1142/S0218271814430093 | CERN-PH-TH-2014-193 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories of gravitation without Lorentz invariance are candidates of
low-energy descriptions of quantum gravity. In this review we will describe the
phenomenological consequences of the candidates associated to the existence of
a preferred time direction
| [
{
"created": "Mon, 15 Dec 2014 22:43:08 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2015 08:57:10 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Blas",
"Diego",
""
],
[
"Lim",
"Eugene",
""
]
] | Theories of gravitation without Lorentz invariance are candidates of low-energy descriptions of quantum gravity. In this review we will describe the phenomenological consequences of the candidates associated to the existence of a preferred time direction |
2406.01758 | Ahmed Sheta | Ahmed Sheta, Yuri Levin | Gravitational Wave Driven Inspirals of Binaries Connected by Cosmic
Strings | 12 pages, 8 figures. v2: minor changes and removed word from title,
as published in PRD | Phys. Rev. D 110, 024074 (2024) | 10.1103/PhysRevD.110.024074 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider gravitational waves from a pair of monopoles or black holes that
are moving non-relativistically and are connected by a cosmic string. Shortly
after the binary's formation, the connecting string straightens due the direct
coupling of its motion to gravitational radiation. Afterwards, the motion of
the bin... | [
{
"created": "Mon, 3 Jun 2024 19:53:42 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jul 2024 15:58:11 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Sheta",
"Ahmed",
""
],
[
"Levin",
"Yuri",
""
]
] | We consider gravitational waves from a pair of monopoles or black holes that are moving non-relativistically and are connected by a cosmic string. Shortly after the binary's formation, the connecting string straightens due the direct coupling of its motion to gravitational radiation. Afterwards, the motion of the binar... |
gr-qc/0006002 | Patricio S. Letelier | Guillermo A. Gonz\'alez and Patricio S. Letelier | Rotating Relativistic Thin Disks | 18 eps figures, to be published PRD | Phys.Rev. D62 (2000) 064025 | 10.1103/PhysRevD.62.064025 | null | gr-qc | null | Two families of models of rotating relativistic disks based on Taub-NUT and
Kerr metrics are constructed using the well-known "displace, cut and reflect"
method. We find that for disks built from a generic stationary axially
symmetric metric the "sound velocity", $(pressure/density)^{1/2}$, is equal to
the geometric ... | [
{
"created": "Thu, 1 Jun 2000 16:43:13 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"González",
"Guillermo A.",
""
],
[
"Letelier",
"Patricio S.",
""
]
] | Two families of models of rotating relativistic disks based on Taub-NUT and Kerr metrics are constructed using the well-known "displace, cut and reflect" method. We find that for disks built from a generic stationary axially symmetric metric the "sound velocity", $(pressure/density)^{1/2}$, is equal to the geometric me... |
2203.11041 | Phongpichit Channuie | Apirak Payaka (Walailak U.), Waluka Amaek (Walailak U.), Phongpichit
Channuie (Walailak U.) | Warm deformed $R^{2}$ inflation | v3: 20 pages, 5 figures,, version accepted for publication in Nuclear
Physics B | Nuclear Physics B 986 (2023) 116052 | 10.1016/j.nuclphysb.2022.116052 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we study warm inflationary scenario based on a deformation of
$R^{2}$ gravity. We start considering $R^{p}$ and assume $p=2(1+\delta)$ with
$\delta\ll 1$ so that we simply obtain warm $R^{2}$ inflation when setting
$\delta=0$. We then derive the potential in the Einstein frame and consider a
dissipation... | [
{
"created": "Mon, 21 Mar 2022 15:03:28 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Apr 2022 08:06:54 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2022 13:10:39 GMT",
"version": "v3"
}
] | 2022-12-20 | [
[
"Payaka",
"Apirak",
"",
"Walailak U."
],
[
"Amaek",
"Waluka",
"",
"Walailak U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
]
] | In this work, we study warm inflationary scenario based on a deformation of $R^{2}$ gravity. We start considering $R^{p}$ and assume $p=2(1+\delta)$ with $\delta\ll 1$ so that we simply obtain warm $R^{2}$ inflation when setting $\delta=0$. We then derive the potential in the Einstein frame and consider a dissipation p... |
1310.6399 | David Sloan | Alejandro Corichi and David Sloan | Inflationary Attractors and their Measures | 8 pages, 1 figure | Class. Quant. Grav. 31 (2014) 062001 | 10.1088/0264-9381/31/6/062001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several recent misconceptions about the measure problem in inflation and the
nature of inflationary attractors are addressed. We show that within the
Hamiltonian system of flat Friedmann-Lema\^itre-Robertson-Walker cosmology
coupled to a massive scalar field, the focussing of the Liouville measure on
attractor soluti... | [
{
"created": "Wed, 23 Oct 2013 21:34:54 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2014 16:13:14 GMT",
"version": "v2"
}
] | 2015-07-28 | [
[
"Corichi",
"Alejandro",
""
],
[
"Sloan",
"David",
""
]
] | Several recent misconceptions about the measure problem in inflation and the nature of inflationary attractors are addressed. We show that within the Hamiltonian system of flat Friedmann-Lema\^itre-Robertson-Walker cosmology coupled to a massive scalar field, the focussing of the Liouville measure on attractor solution... |
1810.12111 | Pedro Cañate Casseres | Pedro Ca\~nate, Nora Breton | Black Hole-Wormhole transition in (2+1) Einstein -- anti-de Sitter
Gravity Coupled to Nonlinear Electrodynamics | Typos corrected. Published in Physical Review D. arXiv admin note:
text overlap with arXiv:1307.6655 by other authors | null | 10.1103/PhysRevD.98.104012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present two results in $(2+1)$ gravity coupled to nonlinear
electrodynamics. First it is determined the general form of the electromagnetic
field tensor in $(2+1)$ gravity coupled to nonlinear electrodynamics in
stationary cyclic spacetimes. Secondly, it is determined a family of exact
solutions in $... | [
{
"created": "Fri, 26 Oct 2018 00:50:01 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jul 2019 12:04:00 GMT",
"version": "v2"
}
] | 2019-07-03 | [
[
"Cañate",
"Pedro",
""
],
[
"Breton",
"Nora",
""
]
] | In this paper we present two results in $(2+1)$ gravity coupled to nonlinear electrodynamics. First it is determined the general form of the electromagnetic field tensor in $(2+1)$ gravity coupled to nonlinear electrodynamics in stationary cyclic spacetimes. Secondly, it is determined a family of exact solutions in $(2... |
0803.3936 | Narayan Banerjee | Sudipta Das, Narayan Banerjee | Brans-Dicke Scalar Field as a Chameleon | 10 pages, 8 figures; Contents added, References added; Revised
version accepted for publication in Physical Review D | Phys.Rev.D78:043512,2008 | 10.1103/PhysRevD.78.043512 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it is shown that in Brans - Dicke theory, if one considers a
non-minimal coupling between the matter and the scalar field, it can give rise
to a late time accelerated expansion for the universe preceded by a decelerated
expansion for very high values of the Brans - Dicke parameter $\omega$.
| [
{
"created": "Thu, 27 Mar 2008 14:26:45 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 2008 11:35:26 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Das",
"Sudipta",
""
],
[
"Banerjee",
"Narayan",
""
]
] | In this paper it is shown that in Brans - Dicke theory, if one considers a non-minimal coupling between the matter and the scalar field, it can give rise to a late time accelerated expansion for the universe preceded by a decelerated expansion for very high values of the Brans - Dicke parameter $\omega$. |
1801.05826 | Sean Gryb | Sean Gryb and Karim P. Y. Th\'ebault | Bouncing Unitary Cosmology II: Mini-Superspace Phenomenology | Version published in Classical Quantum Gravity. 20 pages, 8 figures | null | 10.1088/1361-6382/aaf837 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A companion paper provides a proposal for cosmic singularity resolution based
upon general features of a bouncing unitary cosmological model in the
mini-superspace approximation. This paper analyses novel phenomenology that can
be identified within particular solutions of that model. First, we justify our
choice of p... | [
{
"created": "Wed, 17 Jan 2018 19:08:24 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Dec 2018 11:40:35 GMT",
"version": "v2"
}
] | 2018-12-17 | [
[
"Gryb",
"Sean",
""
],
[
"Thébault",
"Karim P. Y.",
""
]
] | A companion paper provides a proposal for cosmic singularity resolution based upon general features of a bouncing unitary cosmological model in the mini-superspace approximation. This paper analyses novel phenomenology that can be identified within particular solutions of that model. First, we justify our choice of par... |
1903.05996 | Phongpichit Channuie | Phongpichit Channuie (Walailak U.) | Deformed Starobinsky model in gravity's rainbow | v1: 16 pages, 8 figures | Eur. Phys. J. C79 (2019) no.6, 508 | 10.1140/epjc/s10052-019-7031-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of gravity's rainbow, we study the deformed Starobinsky model
in which the deformations take the form $f(R)\sim R^{2(1-\alpha)}$, with $R$
the Ricci scalar and $\alpha$ a positive parameter. We show that the spectral
index of curvature perturbation and the tensor-to-scalar ratio can be written
in terms... | [
{
"created": "Sat, 9 Mar 2019 12:36:54 GMT",
"version": "v1"
}
] | 2019-06-18 | [
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
]
] | In the context of gravity's rainbow, we study the deformed Starobinsky model in which the deformations take the form $f(R)\sim R^{2(1-\alpha)}$, with $R$ the Ricci scalar and $\alpha$ a positive parameter. We show that the spectral index of curvature perturbation and the tensor-to-scalar ratio can be written in terms o... |
1005.5565 | Edward Wilson-Ewing | Edward Wilson-Ewing | Loop quantum cosmology of Bianchi type IX models | 20 pages | Phys.Rev.D82:043508,2010 | 10.1103/PhysRevD.82.043508 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The loop quantum cosmology "improved dynamics" of the Bianchi type IX model
are studied. The action of the Hamiltonian constraint operator is obtained via
techniques developed for the Bianchi type I and type II models, no new input is
required. It is shown that the big bang and big crunch singularities are
resolved b... | [
{
"created": "Sun, 30 May 2010 23:23:38 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Wilson-Ewing",
"Edward",
""
]
] | The loop quantum cosmology "improved dynamics" of the Bianchi type IX model are studied. The action of the Hamiltonian constraint operator is obtained via techniques developed for the Bianchi type I and type II models, no new input is required. It is shown that the big bang and big crunch singularities are resolved by ... |
1703.00373 | Sharmanthie Fernando | Sharmanthie Fernando | Spinning dilaton black hole in 2+1 dimensions as a particle accelerator | 13 pages, 4 figures, accepted to be published in Modern Physics
Letters A | Mod. Phys. Lett. A, Vol.32, No. 13, 1750074 (2017) | 10.1142/S0217732317500742 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have studied particle collision around a spinning dilaton
black hole in 2 +1 dimensions. This black hole is a solution to the low energy
string theory in 2+1 dimensions. Time-like geodesics are presented in detail
and the center of mass energy of two particles collision at the horizon of a
spinning b... | [
{
"created": "Wed, 1 Mar 2017 16:37:12 GMT",
"version": "v1"
}
] | 2017-05-03 | [
[
"Fernando",
"Sharmanthie",
""
]
] | In this paper we have studied particle collision around a spinning dilaton black hole in 2 +1 dimensions. This black hole is a solution to the low energy string theory in 2+1 dimensions. Time-like geodesics are presented in detail and the center of mass energy of two particles collision at the horizon of a spinning bla... |
2206.12641 | Andronikos Paliathanasis | Andronikos Paliathanasis | New inflationary exact solution from Lie symmetries | 19 pages, 5 figures, to appear in MPLA | null | 10.1142/S021773232250119X | null | gr-qc astro-ph.CO math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | For the inflaton field we determine a new exact solution by using the Lie
symmetry analysis. Specifically, we construct a second-order differential
master equation for arbitrary scalar field potential by assuming that the
spectral index for the density perturbations $n_{s}$ and the scalar to tensor
ratio $r$ are rela... | [
{
"created": "Sat, 25 Jun 2022 12:54:21 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | For the inflaton field we determine a new exact solution by using the Lie symmetry analysis. Specifically, we construct a second-order differential master equation for arbitrary scalar field potential by assuming that the spectral index for the density perturbations $n_{s}$ and the scalar to tensor ratio $r$ are relate... |
2308.08759 | Nikolaos Dimakis | N. Dimakis, A. Paliathanasis and T. Christodoulakis | Exploring Quantum Cosmology within the Framework of Teleparallel
$f(T)$-gravity | 40 pages, 5 figures, Latex2e source file, version accepted by PRD | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate quantum cosmology in teleparallel $f(T)$-gravity. We delve
extensively into the minisuperspace description within the context of
teleparallelism. The $f(T)$-theory constitutes a second-order theory of
gravity, whose cosmological counterpart is delineated by a degenerate
point-like Lagrangian. To formul... | [
{
"created": "Thu, 17 Aug 2023 03:14:57 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2023 13:19:22 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Dimakis",
"N.",
""
],
[
"Paliathanasis",
"A.",
""
],
[
"Christodoulakis",
"T.",
""
]
] | We investigate quantum cosmology in teleparallel $f(T)$-gravity. We delve extensively into the minisuperspace description within the context of teleparallelism. The $f(T)$-theory constitutes a second-order theory of gravity, whose cosmological counterpart is delineated by a degenerate point-like Lagrangian. To formulat... |
1006.5214 | Herbert Hamber | Herbert W. Hamber and Reiko Toriumi | Cosmological Density Perturbations with a Scale-Dependent Newton's G | 54 pages, 4 figures | Phys.Rev.D82:043518,2010 | 10.1103/PhysRevD.82.043518 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore possible cosmological consequences of a running Newton's constant
$ G ( \Box ) $, as suggested by the non-trivial ultraviolet fixed point
scenario in the quantum field-theoretic treatment of Einstein gravity with a
cosmological constant term. In particular we focus here on what possible
effects the scale-d... | [
{
"created": "Sun, 27 Jun 2010 14:18:30 GMT",
"version": "v1"
}
] | 2011-09-08 | [
[
"Hamber",
"Herbert W.",
""
],
[
"Toriumi",
"Reiko",
""
]
] | We explore possible cosmological consequences of a running Newton's constant $ G ( \Box ) $, as suggested by the non-trivial ultraviolet fixed point scenario in the quantum field-theoretic treatment of Einstein gravity with a cosmological constant term. In particular we focus here on what possible effects the scale-dep... |
gr-qc/9511029 | null | Mathias Trucks (Technische Universit\"at Berlin, Germany) | Correlations of Quantum Fields on Robertson-Walker Spacetimes | 14 pages, Latex2e | Class.Quant.Grav. 13 (1996) 2941-2952 | 10.1088/0264-9381/13/11/010 | null | gr-qc | null | It is a well known fact that quantum fields on Minkowski spacetime are
correlated for each pair of spacetime regions. In Robertson-Walker spacetimes
there are spacelike separated regions with disjoint past horizons but the
absence of correlations in that case was never proved. We derive in this paper
formulae for cor... | [
{
"created": "Thu, 9 Nov 1995 16:30:37 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Trucks",
"Mathias",
"",
"Technische Universität Berlin, Germany"
]
] | It is a well known fact that quantum fields on Minkowski spacetime are correlated for each pair of spacetime regions. In Robertson-Walker spacetimes there are spacelike separated regions with disjoint past horizons but the absence of correlations in that case was never proved. We derive in this paper formulae for corre... |
gr-qc/9306013 | Todd Brun | Todd A. Brun | Quasiclassical Equations of Motion for Nonlinear Brownian Systems | 24 pages, CALT-68-1848 (RevTeX 2.0 macros) | Phys.Rev. D47 (1993) 3383-3393 | 10.1103/PhysRevD.47.3383 | null | gr-qc | null | Following the formalism of Gell-Mann and Hartle, phenomenological equations
of motion are derived from the decoherence functional formalism of quantum
mechanics, using a path-integral description. This is done explicitly for the
case of a system interacting with a ``bath'' of harmonic oscillators whose
individual mot... | [
{
"created": "Tue, 8 Jun 1993 22:46:23 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Brun",
"Todd A.",
""
]
] | Following the formalism of Gell-Mann and Hartle, phenomenological equations of motion are derived from the decoherence functional formalism of quantum mechanics, using a path-integral description. This is done explicitly for the case of a system interacting with a ``bath'' of harmonic oscillators whose individual motio... |
2303.14854 | Eugene Yew Siang Chua | Eugene Y. S. Chua, Craig Callender | No Time for Time from No-Time | Presented at Philosophy of Science Association 2021 meeting | Philosophy of Science 88 (5), 2021 | 10.1086/714870 | null | gr-qc physics.hist-ph | http://creativecommons.org/licenses/by/4.0/ | Programs in quantum gravity often claim that time emerges from fundamentally
timeless physics. In the semiclassical time program time arises only after
approximations are taken. Here we ask what justifies taking these
approximations and show that time seems to sneak in when answering this
question. This raises the wo... | [
{
"created": "Sun, 26 Mar 2023 23:36:12 GMT",
"version": "v1"
}
] | 2023-03-28 | [
[
"Chua",
"Eugene Y. S.",
""
],
[
"Callender",
"Craig",
""
]
] | Programs in quantum gravity often claim that time emerges from fundamentally timeless physics. In the semiclassical time program time arises only after approximations are taken. Here we ask what justifies taking these approximations and show that time seems to sneak in when answering this question. This raises the worr... |
0907.2481 | Hui Yao | Hui Yao (Cambridge U) | Towards Quantum Field Theory in Curved Spacetime for an Arbitrary
Observer | 22 pages, 2 figures; submitted to Found. Phys | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new framework of quantum field theory for an arbitrary observer
in curved spacetime, defined in the spacetime region in which each point can
both receive a signal from and send a signal to the observer. Multiple
motivations for this proposal are discussed. We argue that radar time should be
applied to sl... | [
{
"created": "Wed, 15 Jul 2009 17:21:49 GMT",
"version": "v1"
}
] | 2009-07-16 | [
[
"Yao",
"Hui",
"",
"Cambridge U"
]
] | We propose a new framework of quantum field theory for an arbitrary observer in curved spacetime, defined in the spacetime region in which each point can both receive a signal from and send a signal to the observer. Multiple motivations for this proposal are discussed. We argue that radar time should be applied to slic... |
gr-qc/0107068 | Vojtich Pravda | A. Pravdova, V. Pravda | Boost-rotation symmetric vacuum spacetimes with spinning sources | REVTeX 4, 9 pages | J.Math.Phys.43:1536-1546,2002 | 10.1063/1.1433941 | null | gr-qc | null | Boost-rotation symmetric vacuum spacetimes with spinning sources which
correspond to gravitational field of uniformly accelerated spinning "particles"
are studied. Regularity conditions and asymptotic properties are analyzed. News
functions are derived by transforming the general spinning boost-rotation
symmetric vac... | [
{
"created": "Fri, 20 Jul 2001 13:23:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pravdova",
"A.",
""
],
[
"Pravda",
"V.",
""
]
] | Boost-rotation symmetric vacuum spacetimes with spinning sources which correspond to gravitational field of uniformly accelerated spinning "particles" are studied. Regularity conditions and asymptotic properties are analyzed. News functions are derived by transforming the general spinning boost-rotation symmetric vacuu... |
0908.4495 | Clovis Jacinto de Matos | Clovis Jacinto de Matos | Physical Vacuum in Superconductors | 22 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although experiments carried out by Jain et al. showed that the Cooper pairs
obey the strong equivalence principle, The measurement of the Cooper pairs
inertial mass by Tate et al. revealed an anomalous excess of mass. In the
present paper we interpret these experimental results in the framework of an
electromagnetic... | [
{
"created": "Mon, 31 Aug 2009 10:25:37 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"de Matos",
"Clovis Jacinto",
""
]
] | Although experiments carried out by Jain et al. showed that the Cooper pairs obey the strong equivalence principle, The measurement of the Cooper pairs inertial mass by Tate et al. revealed an anomalous excess of mass. In the present paper we interpret these experimental results in the framework of an electromagnetic m... |
2104.01607 | Yaser Ahmadi | Y. Ahmadi, F. Jalilifard, M. V. Takook | Scalar spinor fields interaction in de Sitter ambient space formalism | 10 pages, 1 figure | Modern Physics Letters A, Vol. 34, No. 25, 1950205 (2019) | 10.1142/S0217732319502055 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In de Sitter ambient space formalism, the massless minimally coupled scalar
field can be constructed from a massless conformally coupled scalar field and a
constant five-vector $A^{\alpha}$. Also, a constant five-vector $B^{\alpha}$
appears in the interaction Lagrangian of massless minimally coupled scalar and
spinor... | [
{
"created": "Sun, 4 Apr 2021 12:59:48 GMT",
"version": "v1"
}
] | 2021-04-06 | [
[
"Ahmadi",
"Y.",
""
],
[
"Jalilifard",
"F.",
""
],
[
"Takook",
"M. V.",
""
]
] | In de Sitter ambient space formalism, the massless minimally coupled scalar field can be constructed from a massless conformally coupled scalar field and a constant five-vector $A^{\alpha}$. Also, a constant five-vector $B^{\alpha}$ appears in the interaction Lagrangian of massless minimally coupled scalar and spinor f... |
2212.00550 | Kuan-Nan Lin | Kuan-Nan Lin, Pisin Chen | Reflections on reflections | 8 pages, 4 figures | null | null | null | gr-qc hep-ex hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | Analog Hawking radiation emitted by a perfectly reflecting mirror in
(1+3)-dimensional flat spacetime is investigated. This is accomplished by
studying the reflected frequency and momentum based on Einstein mirror, instead
of the canonical way of solving, if possible, wave equations subjected to a
dynamical Dirichlet... | [
{
"created": "Thu, 1 Dec 2022 14:55:47 GMT",
"version": "v1"
}
] | 2022-12-02 | [
[
"Lin",
"Kuan-Nan",
""
],
[
"Chen",
"Pisin",
""
]
] | Analog Hawking radiation emitted by a perfectly reflecting mirror in (1+3)-dimensional flat spacetime is investigated. This is accomplished by studying the reflected frequency and momentum based on Einstein mirror, instead of the canonical way of solving, if possible, wave equations subjected to a dynamical Dirichlet b... |
0812.3057 | Luca Lusanna | David Alba and Luca Lusanna | Charged Particles and the Electro-Magnetic Field in Non-Inertial Frames
of Minkowski Spacetime | 106 pAGES | null | null | null | gr-qc astro-ph hep-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the 3+1 point of view and parametrized Minkowski theories we develop
the theory of {\it non-inertial} frames in Minkowski space-time. The transition
from a non-inertial frame to another one is a gauge transformation connecting
the respective notions of instantaneous 3-space (clock synchronization
convention)... | [
{
"created": "Tue, 16 Dec 2008 13:46:47 GMT",
"version": "v1"
}
] | 2008-12-17 | [
[
"Alba",
"David",
""
],
[
"Lusanna",
"Luca",
""
]
] | By using the 3+1 point of view and parametrized Minkowski theories we develop the theory of {\it non-inertial} frames in Minkowski space-time. The transition from a non-inertial frame to another one is a gauge transformation connecting the respective notions of instantaneous 3-space (clock synchronization convention) a... |
2302.07022 | Mario A. Acero | A. Oliveros, Mario A. Acero | Late-time cosmology in a model of modified gravity with an exponential
function of the curvature | 23 pages, 16 figures. References added. Minor modifications,
conclusions unchanged. Accepted for publication in Physics of the Dark
Universe. Matched accepted version | Phys.Dark Univ. 40 (2023) 101207 | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this work, we analyse the late-time evolution of the universe for a
particular $f(R)$ gravity model built from an exponential function of the
scalar curvature. Following the literature, we write the field equations in
terms of a suited statefinder function ($y_H(z)$) and considering well
motivated physical initial... | [
{
"created": "Tue, 14 Feb 2023 13:05:16 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2023 15:23:20 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Mar 2023 13:27:39 GMT",
"version": "v3"
},
{
"created": "Fri, 17 Mar 2023 21:52:53 GMT",
"version": "v4"
}
] | 2023-10-18 | [
[
"Oliveros",
"A.",
""
],
[
"Acero",
"Mario A.",
""
]
] | In this work, we analyse the late-time evolution of the universe for a particular $f(R)$ gravity model built from an exponential function of the scalar curvature. Following the literature, we write the field equations in terms of a suited statefinder function ($y_H(z)$) and considering well motivated physical initial c... |
gr-qc/0507037 | Kristina Giesel | Kristina Giesel, Thomas Thiemann | Consistency Check on Volume and Triad Operator Quantisation in Loop
Quantum Gravity II | 67 pages, 6 figures, 36 pages paper, 31 pages appendix | Class.Quant.Grav. 23 (2006) 5693-5772 | 10.1088/0264-9381/23/18/012 | AEI-2005-120 | gr-qc | null | In this paper we provide the techniques and proofs for the resuls presented
in our companion paper concerning the consistency check on volume and triad
operator quantisation in Loop Quantum Gravity.
| [
{
"created": "Fri, 8 Jul 2005 11:51:48 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2005 15:21:28 GMT",
"version": "v2"
}
] | 2017-01-18 | [
[
"Giesel",
"Kristina",
""
],
[
"Thiemann",
"Thomas",
""
]
] | In this paper we provide the techniques and proofs for the resuls presented in our companion paper concerning the consistency check on volume and triad operator quantisation in Loop Quantum Gravity. |
gr-qc/0703146 | Brihaye Yves | Y. Brihaye and T. Delsate | Charged-rotating black holes and black strings in higher dimensional
Einstein-Maxwell theory with a positive cosmological constant | 21 pages, 9 figures | Class.Quant.Grav.24:4691-4710,2007 | 10.1088/0264-9381/24/18/010 | null | gr-qc | null | We present arguments for the existence of charged, rotating black holes in
$d=2N+1$ dimensions, with $d\geq 5$ with a positive cosmological constant.
These solutions posses both, a regular horizon and a cosmological horizon of
spherical topology and have $N$ equal-magnitude angular momenta. They approach
asymptotical... | [
{
"created": "Thu, 29 Mar 2007 13:05:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Brihaye",
"Y.",
""
],
[
"Delsate",
"T.",
""
]
] | We present arguments for the existence of charged, rotating black holes in $d=2N+1$ dimensions, with $d\geq 5$ with a positive cosmological constant. These solutions posses both, a regular horizon and a cosmological horizon of spherical topology and have $N$ equal-magnitude angular momenta. They approach asymptotically... |
2012.04486 | Maximiliano Isi | Maximiliano Isi, Will M. Farr, Matthew Giesler, Mark A. Scheel, and
Saul A. Teukolsky | Testing the black-hole area law with GW150914 | 3 pages, 3 figures (journal version) | Phys. Rev. Lett. 127, 011103 (2021) | 10.1103/PhysRevLett.127.011103 | LIGO-P2000507 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We present observational confirmation of Hawking's black-hole area theorem
based on data from GW150914, finding agreement with the prediction with 97%
(95%) probability when we model the ringdown including (excluding) overtones of
the quadrupolar mode. We obtain this result from a new time-domain analysis of
the pre-... | [
{
"created": "Tue, 8 Dec 2020 15:26:20 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jun 2021 20:04:43 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Isi",
"Maximiliano",
""
],
[
"Farr",
"Will M.",
""
],
[
"Giesler",
"Matthew",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | We present observational confirmation of Hawking's black-hole area theorem based on data from GW150914, finding agreement with the prediction with 97% (95%) probability when we model the ringdown including (excluding) overtones of the quadrupolar mode. We obtain this result from a new time-domain analysis of the pre- a... |
gr-qc/9307006 | null | J. Fernando Barbero and Madhavan Varadarajan | The Phase Space of 2+1 Dimensional Gravity in the Ashtekar Formulation | 19 pages, preprint# SU-GP-93/64 | Nucl.Phys.B415:515-532,1994 | 10.1016/0550-3213(94)90121-X | null | gr-qc | null | The Ashtekar formulation of 2+1 gravity differs from the geometrodynamical
and Witten descriptions when the 2-metric is degenerate. We study the phase
space of 2+1 gravity in the Ashtekar formulation to understand these degenerate
solutions to the field equations. In the process we find two new systems of
first class... | [
{
"created": "Thu, 8 Jul 1993 21:52:00 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Barbero",
"J. Fernando",
""
],
[
"Varadarajan",
"Madhavan",
""
]
] | The Ashtekar formulation of 2+1 gravity differs from the geometrodynamical and Witten descriptions when the 2-metric is degenerate. We study the phase space of 2+1 gravity in the Ashtekar formulation to understand these degenerate solutions to the field equations. In the process we find two new systems of first class c... |
0807.3325 | Victor Taveras | Victor Taveras | Corrections to the Friedmann Equations from LQG for a Universe with a
Free Scalar Field | Phys. Rev. D78, 064072 (2008) | Phys.Rev.D78:064072,2008 | 10.1103/PhysRevD.78.064072 | IGC-08/7-2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In loop quantum cosmology the quantum dynamics is well understood. We
approximate the full quantum dynamics in the infinite dimensional Hilbert space
by projecting it on a finite dimensional submanifold thereof, spanned by
suitably chosen semiclassical states. This submanifold is isomorphic with the
classical phase s... | [
{
"created": "Mon, 21 Jul 2008 19:16:47 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Nov 2008 20:38:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Taveras",
"Victor",
""
]
] | In loop quantum cosmology the quantum dynamics is well understood. We approximate the full quantum dynamics in the infinite dimensional Hilbert space by projecting it on a finite dimensional submanifold thereof, spanned by suitably chosen semiclassical states. This submanifold is isomorphic with the classical phase spa... |
gr-qc/9702024 | Franciso Turrubiates | Jerzy F. Plebanski (Cinvestav-phys), G.R. Moreno (Cinvestav-math) and
F.J. Turrubiates (Cinvestav-phys) | Differential Forms, Hopf Algebra and General Relativity I | 36 pages, LaTeX file, no figures | Acta Phys.Polon. B28 (1997) 1515-1552 | null | CINVESTAV-FIS-05/97 | gr-qc | null | We review the language of differential forms and their applications to
Riemannian Geometry with an orientation to General Relativity. Working with the
principal algebraic and differential operations on forms, we obtain the
structure equations and their symmetries in terms of a new product (the
co-multiplication). It ... | [
{
"created": "Thu, 13 Feb 1997 18:51:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Plebanski",
"Jerzy F.",
"",
"Cinvestav-phys"
],
[
"Moreno",
"G. R.",
"",
"Cinvestav-math"
],
[
"Turrubiates",
"F. J.",
"",
"Cinvestav-phys"
]
] | We review the language of differential forms and their applications to Riemannian Geometry with an orientation to General Relativity. Working with the principal algebraic and differential operations on forms, we obtain the structure equations and their symmetries in terms of a new product (the co-multiplication). It is... |
1712.04237 | Seiga Sato | Seiga Sato and Kei-ichi Maeda | Hybrid Higgs Inflation: The Use of Disformal Transformation | 16 pages, 6 figures, 1 table | Phys. Rev. D 97, 083512 (2018) | 10.1103/PhysRevD.97.083512 | WU-AP/1706/17 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a hybrid type of the conventional Higgs inflation and new Higgs
inflation models. We perform a disformal transformation into the Einstein frame
and analyze the background dynamics and the cosmological perturbations in the
truncated model, in which we ignore the higher-derivative terms of the Higgs
field. F... | [
{
"created": "Tue, 12 Dec 2017 11:15:36 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2017 09:41:21 GMT",
"version": "v2"
}
] | 2018-04-25 | [
[
"Sato",
"Seiga",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We propose a hybrid type of the conventional Higgs inflation and new Higgs inflation models. We perform a disformal transformation into the Einstein frame and analyze the background dynamics and the cosmological perturbations in the truncated model, in which we ignore the higher-derivative terms of the Higgs field. Fro... |
1405.1283 | Luke Butcher | Luke M. Butcher | Casimir Energy of a Long Wormhole Throat | 17 pages, 3 figures. Submitted to Phys. Rev. D | Phys. Rev. D 90, 024019 (2014) | 10.1103/PhysRevD.90.024019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the Casimir energy-momentum tensor induced in a scalar field by
a macroscopic ultrastatic spherically-symmetric long-throated traversable
wormhole, and examine whether this exotic matter is sufficient to stabilise the
wormhole itself. The Casimir energy-momentum tensor is obtained (within the
$\mathbb{R}... | [
{
"created": "Tue, 6 May 2014 14:35:57 GMT",
"version": "v1"
}
] | 2014-07-09 | [
[
"Butcher",
"Luke M.",
""
]
] | We calculate the Casimir energy-momentum tensor induced in a scalar field by a macroscopic ultrastatic spherically-symmetric long-throated traversable wormhole, and examine whether this exotic matter is sufficient to stabilise the wormhole itself. The Casimir energy-momentum tensor is obtained (within the $\mathbb{R}\t... |
2301.09395 | David Trestini | David Trestini, Luc Blanchet | Gravitational-wave tails of memory | 40 page, 1 figure, 1 table and 2 ancillary files | Phys. Rev. D 107, 104048 (2023) | 10.1103/PhysRevD.107.104048 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational-wave tails are linear waves that backscatter on the curvature
of space-time generated by the total mass-energy of the source. The non-linear
memory effect arises from gravitational waves sourced by the stress-energy
distribution of linear waves themselves. These two effects are due to quadratic
multipol... | [
{
"created": "Mon, 23 Jan 2023 12:32:10 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Feb 2024 16:50:18 GMT",
"version": "v2"
}
] | 2024-02-16 | [
[
"Trestini",
"David",
""
],
[
"Blanchet",
"Luc",
""
]
] | Gravitational-wave tails are linear waves that backscatter on the curvature of space-time generated by the total mass-energy of the source. The non-linear memory effect arises from gravitational waves sourced by the stress-energy distribution of linear waves themselves. These two effects are due to quadratic multipolar... |
gr-qc/0111042 | Patricia Purdue | Patricia Purdue | An analysis of a QND speed-meter interferometer | 12 pages, 5 figures; corrected formula and some values describing
power requirements | Phys.Rev. D66 (2002) 022001 | 10.1103/PhysRevD.66.022001 | null | gr-qc | null | In the quest to develop viable designs for third-generation optical
interferometric gravitational-wave detectors (e.g. LIGO-III and EURO), one
strategy is to monitor the relative momentum or speed of the test-mass mirrors,
rather than monitoring their relative position. This paper describes and
analyzes the most stra... | [
{
"created": "Tue, 13 Nov 2001 23:13:13 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2004 16:17:19 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Purdue",
"Patricia",
""
]
] | In the quest to develop viable designs for third-generation optical interferometric gravitational-wave detectors (e.g. LIGO-III and EURO), one strategy is to monitor the relative momentum or speed of the test-mass mirrors, rather than monitoring their relative position. This paper describes and analyzes the most straig... |
1805.10673 | Dirk Puetzfeld | Dirk Puetzfeld, Yuri N. Obukhov, Claus L\"ammerzahl | Gravitational clock compass in General Relativity | 12 pages, 6 figures | Phys. Rev. D 98, 024032 (2018) | 10.1103/PhysRevD.98.024032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how a suitably prepared set of clocks can be used to determine all
components of the gravitational field in General Relativity. We call such an
experimental setup a clock compass, in analogy to the usual gravitational
compass. Particular attention is paid to the construction of the underlying
reference frame.... | [
{
"created": "Sun, 27 May 2018 18:27:36 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2018 13:58:35 GMT",
"version": "v2"
}
] | 2018-07-26 | [
[
"Puetzfeld",
"Dirk",
""
],
[
"Obukhov",
"Yuri N.",
""
],
[
"Lämmerzahl",
"Claus",
""
]
] | We show how a suitably prepared set of clocks can be used to determine all components of the gravitational field in General Relativity. We call such an experimental setup a clock compass, in analogy to the usual gravitational compass. Particular attention is paid to the construction of the underlying reference frame. C... |
1406.6096 | Eugeny Babichev | Eugeny Babichev and Alessandro Fabbri | Rotating black holes in massive gravity | 7 pages; v2: typos corrected, references added; v3: matches published
version | Phys. Rev. D 90, 084019 (2014) | 10.1103/PhysRevD.90.084019 | LPT-Orsay-14-80 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a solution for rotating black holes in massive gravity. We first
give a solution of massive gravity with one dynamical metric. Both metrics of
this solution are expressed in the advanced Eddington-Finkelstein-like
coordinates: the physical metric has the original Kerr line element, while the
fiducial metri... | [
{
"created": "Mon, 23 Jun 2014 21:11:50 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jul 2014 18:39:40 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Oct 2014 09:20:00 GMT",
"version": "v3"
}
] | 2014-11-07 | [
[
"Babichev",
"Eugeny",
""
],
[
"Fabbri",
"Alessandro",
""
]
] | We present a solution for rotating black holes in massive gravity. We first give a solution of massive gravity with one dynamical metric. Both metrics of this solution are expressed in the advanced Eddington-Finkelstein-like coordinates: the physical metric has the original Kerr line element, while the fiducial metric ... |
gr-qc/9909067 | N. K. Dadhich | Naresh Dadhich | Electromagnetic duality in general relativity | 18 pages, LaTEX version | Gen.Rel.Grav. 32 (2000) 1009-1023 | 10.1023/A:1001913409254 | IUCAA-36/99 | gr-qc | null | By resolving the Riemann curvature relative to a unit timelike vector into
electric and magnetic parts, we consider duality relations analogous to the
electromagnetic theory. It turns out that the duality symmetry of the Einstein
action implies the Einstein vacuum equation without the cosmological term. The
vacuum eq... | [
{
"created": "Tue, 21 Sep 1999 12:15:01 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Dadhich",
"Naresh",
""
]
] | By resolving the Riemann curvature relative to a unit timelike vector into electric and magnetic parts, we consider duality relations analogous to the electromagnetic theory. It turns out that the duality symmetry of the Einstein action implies the Einstein vacuum equation without the cosmological term. The vacuum equa... |
2207.14683 | Mariaveronica De Angelis | Mariaveronica De Angelis, Giovanni Montani | On the emergence of a classical Isotropic Universe from a Quantum $f(R)$
Bianchi Cosmology in the Jordan Frame | 9 pages, 4 figures | null | 10.1140/epjc/s10052-023-11454-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate a spontaneous tendency of quantum wave packets to become
quasi-classical, providing a classical limit for the Universe dynamics.
However, this limit is not maintained in the future (after a critical value of
the relational time) and a spreading process is turned on. We show that the
onset of an inflati... | [
{
"created": "Fri, 29 Jul 2022 13:57:20 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2023 17:03:12 GMT",
"version": "v2"
}
] | 2023-04-12 | [
[
"De Angelis",
"Mariaveronica",
""
],
[
"Montani",
"Giovanni",
""
]
] | We demonstrate a spontaneous tendency of quantum wave packets to become quasi-classical, providing a classical limit for the Universe dynamics. However, this limit is not maintained in the future (after a critical value of the relational time) and a spreading process is turned on. We show that the onset of an inflation... |
2011.05328 | Abdel Nasser Tawfik | Abdel Nasser Tawfik (ECTP, Cairo, WLCAPP, Cairo), Abdel Magied Diab
(Modern University for Technology and Information, Cairo, WLCAPP, Cairo),
Sameh Shenawy (Modern Acamdey for Engineering, Cairo, WLCAPP, Cairo), Eiman
Abou El Dahab (Modern University for Technology and Information, Cairo,
WLCAPP, Cairo) | Consequences of Minimal Length Discretization on Line Element, Metric
Tensor and Geodesic Equation | 4 pages, 0 figure, invited talk at 9th int. Workshop on Astronomy and
Relativistic Astrophysics (IWARA2020 Video Conference). accepted for
publication in Astronomical Note (AN) | Astronomische Nachrichten, 2021; 1-4 | 10.1002/asna.202113880 | ECTP-2020-15-15, WLCAPP-2020-15-15 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When minimal length uncertainty emerging from generalized uncertainty
principle (GUP) is thoughtfully implemented, it is of great interest to
consider its impacts on {\it "gravitational} Einstein field equations (gEFE)
and to try to find out whether consequential modifications in metric
manifesting properties of quan... | [
{
"created": "Tue, 10 Nov 2020 08:37:20 GMT",
"version": "v1"
}
] | 2021-02-26 | [
[
"Tawfik",
"Abdel Nasser",
"",
"ECTP, Cairo, WLCAPP, Cairo"
],
[
"Diab",
"Abdel Magied",
"",
"Modern University for Technology and Information, Cairo, WLCAPP, Cairo"
],
[
"Shenawy",
"Sameh",
"",
"Modern Acamdey for Engineering, Cairo, WLCAPP, Cairo"
],
[
... | When minimal length uncertainty emerging from generalized uncertainty principle (GUP) is thoughtfully implemented, it is of great interest to consider its impacts on {\it "gravitational} Einstein field equations (gEFE) and to try to find out whether consequential modifications in metric manifesting properties of quantu... |
gr-qc/9908082 | Thomas P. Kling | Thomas P. Kling, Ezra T. Newman and Alejandro Perez (University of
Pittsburgh) | Iterative Approach to Gravitational Lensing Theory | 27 pages, 2 figures, submitted to Phys.Rev.D, minor revisions, new
references | Phys.Rev. D61 (2000) 104007 | 10.1103/PhysRevD.61.104007 | null | gr-qc astro-ph | null | We develop an iterative approach to gravitational lensing theory based on
approximate solutions of the null geodesic equations. The approach can be
employed in any space-time which is ``close'' to a space-time in which the null
geodesic equations can be completely integrated, such as Minkowski space-time,
Robertson-W... | [
{
"created": "Tue, 31 Aug 1999 18:34:36 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2000 19:15:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kling",
"Thomas P.",
"",
"University of\n Pittsburgh"
],
[
"Newman",
"Ezra T.",
"",
"University of\n Pittsburgh"
],
[
"Perez",
"Alejandro",
"",
"University of\n Pittsburgh"
]
] | We develop an iterative approach to gravitational lensing theory based on approximate solutions of the null geodesic equations. The approach can be employed in any space-time which is ``close'' to a space-time in which the null geodesic equations can be completely integrated, such as Minkowski space-time, Robertson-Wal... |
2105.07042 | Selman Ipek | Selman Ipek | The Entropic Dynamics of Relativistic Quantum Fields in Curved
Space-time | 172 pages; author's doctoral dissertation, Department of Physics,
University at Albany-SUNY, April 2021 | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | It has often been the case in history that the laws of physics have been used
as the framework for understanding and implementing information processing. The
tacit assumption is that the laws of physics are fundamental and that the
notion of information is derived from these laws. Here we take the opposite
view: the ... | [
{
"created": "Fri, 14 May 2021 19:24:21 GMT",
"version": "v1"
}
] | 2021-05-18 | [
[
"Ipek",
"Selman",
""
]
] | It has often been the case in history that the laws of physics have been used as the framework for understanding and implementing information processing. The tacit assumption is that the laws of physics are fundamental and that the notion of information is derived from these laws. Here we take the opposite view: the la... |
gr-qc/0209063 | Kayll Lake | Kayll Lake | Non conducting spherically symmetric fluids | 4 pages revtex4. Added references | Gen.Rel.Grav. 36 (2003) 193-197 | 10.1023/B:GERG.0000006965.74658.1c | null | gr-qc astro-ph | null | A class of spherically symmetric spacetimes invariantly defined by a zero
flux condition is examined first from a purely geometrical point of view and
then physically by way of Einstein's equations for a general fluid
decomposition of the energy-momentum tensor. The approach, which allows a
formal inversion of Einste... | [
{
"created": "Wed, 18 Sep 2002 22:43:50 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Nov 2002 01:28:24 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Feb 2003 14:02:16 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Lake",
"Kayll",
""
]
] | A class of spherically symmetric spacetimes invariantly defined by a zero flux condition is examined first from a purely geometrical point of view and then physically by way of Einstein's equations for a general fluid decomposition of the energy-momentum tensor. The approach, which allows a formal inversion of Einstein... |
2407.00989 | Simran Arora | Ayush Hazarika, Simran Arora, P.K. Sahoo, Tiberiu Harko | $f(Q,L_m)$ gravity, and its cosmological implications | 21 pages, 11 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the present work, we extend the $f(Q)$ symmetric teleparallel gravity by
introducing an arbitrary coupling between the non-metricity $Q$ and matter
Lagrangian $L_m$ in the Lagrangian density $f$ of the theory, which thus leads
to the $f\left(Q,L_m\right)$ theory. This generalisation encompasses Coincident
General ... | [
{
"created": "Mon, 1 Jul 2024 05:55:36 GMT",
"version": "v1"
}
] | 2024-07-02 | [
[
"Hazarika",
"Ayush",
""
],
[
"Arora",
"Simran",
""
],
[
"Sahoo",
"P. K.",
""
],
[
"Harko",
"Tiberiu",
""
]
] | In the present work, we extend the $f(Q)$ symmetric teleparallel gravity by introducing an arbitrary coupling between the non-metricity $Q$ and matter Lagrangian $L_m$ in the Lagrangian density $f$ of the theory, which thus leads to the $f\left(Q,L_m\right)$ theory. This generalisation encompasses Coincident General Re... |
gr-qc/0108006 | Florian Siebel | Florian Siebel (MPA), Jose A. Font (MPA) and Philippos Papadopoulos
(Portsmouth) | Scalar field induced oscillations of neutron stars and gravitational
collapse | 12 pages, 13 figures, submitted to Phys. Rev. D | Phys.Rev. D65 (2002) 024021 | 10.1103/PhysRevD.65.024021 | null | gr-qc astro-ph | null | We study the interaction of massless scalar fields with self-gravitating
neutron stars by means of fully dynamic numerical simulations of the
Einstein-Klein-Gordon perfect fluid system. Our investigation is restricted to
spherical symmetry and the neutron stars are approximated by relativistic
polytropes. Studying th... | [
{
"created": "Thu, 2 Aug 2001 14:37:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Siebel",
"Florian",
"",
"MPA"
],
[
"Font",
"Jose A.",
"",
"MPA"
],
[
"Papadopoulos",
"Philippos",
"",
"Portsmouth"
]
] | We study the interaction of massless scalar fields with self-gravitating neutron stars by means of fully dynamic numerical simulations of the Einstein-Klein-Gordon perfect fluid system. Our investigation is restricted to spherical symmetry and the neutron stars are approximated by relativistic polytropes. Studying the ... |
2407.17846 | Olivier Minazzoli | Olivier Minazzoli and Maxime Wavasseur | Schwarzschild black-hole immersed in uniform electric or magnetic
backgrounds in Entangled Relativity | 5 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we present the solution for a Schwarzschild black-hole
immersed in an electric or magnetic background field within the framework of
Entangled Relativity. Previous solutions in Entangled Relativity required
black-holes to be charged for the matter field to be defined everywhere. This
is because the theo... | [
{
"created": "Thu, 25 Jul 2024 07:59:30 GMT",
"version": "v1"
}
] | 2024-07-26 | [
[
"Minazzoli",
"Olivier",
""
],
[
"Wavasseur",
"Maxime",
""
]
] | In this paper, we present the solution for a Schwarzschild black-hole immersed in an electric or magnetic background field within the framework of Entangled Relativity. Previous solutions in Entangled Relativity required black-holes to be charged for the matter field to be defined everywhere. This is because the theory... |
1002.2035 | Dah-Wei Chiou | Dah-Wei Chiou and Kai Liu | Cosmological inflation driven by holonomy corrections of loop quantum
cosmology | 7 pages, 2 figures, 1 table; one reference added. | Phys.Rev.D81:063526,2010 | 10.1103/PhysRevD.81.063526 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At the level of heuristic effective dynamics, we investigate the cosmological
inflation with holonomy corrections of loop quantum cosmology (LQC) in the
$k=0$ Friedmann-Robertson-Walker model with a single inflaton field subject to
a simple potential. In the symmetric bouncing scenario of LQC, the condition
for occur... | [
{
"created": "Wed, 10 Feb 2010 07:49:58 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Mar 2010 06:50:02 GMT",
"version": "v2"
}
] | 2010-04-29 | [
[
"Chiou",
"Dah-Wei",
""
],
[
"Liu",
"Kai",
""
]
] | At the level of heuristic effective dynamics, we investigate the cosmological inflation with holonomy corrections of loop quantum cosmology (LQC) in the $k=0$ Friedmann-Robertson-Walker model with a single inflaton field subject to a simple potential. In the symmetric bouncing scenario of LQC, the condition for occurre... |
1303.0752 | Daniel Mart\'in-de Blas | Daniel Mart\'in-de Blas, Mercedes Mart\'in-Benito, Guillermo A. Mena
Marug\'an | Inclusion of matter in inhomogeneous loop quantum cosmology | 4 pages. Contribution to the Proceedings of Spanish Relativity
Meeting ERE2011, Madrid 2011 | AIP Conf.Proc. 1458 (2011) 467-470 | 10.1063/1.4734461 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the hybrid quantization of the linearly polarized Gowdy $T^3$ model
with a massless scalar field with the same symmetries as the metric. For
simplicity, we quantize its restriction to the model with local rotational
symmetry. Using this hybrid approach, the homogeneous degrees of freedom of the
geometry are ... | [
{
"created": "Mon, 4 Mar 2013 16:53:13 GMT",
"version": "v1"
}
] | 2013-03-05 | [
[
"Blas",
"Daniel Martín-de",
""
],
[
"Martín-Benito",
"Mercedes",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
]
] | We study the hybrid quantization of the linearly polarized Gowdy $T^3$ model with a massless scalar field with the same symmetries as the metric. For simplicity, we quantize its restriction to the model with local rotational symmetry. Using this hybrid approach, the homogeneous degrees of freedom of the geometry are qu... |
1710.10360 | William Barker Mr | William Barker, Tom\'a\v{s} Ledvinka, Donald Lynden-Bell, Ji\v{r}\'i
Bi\v{c}\'ak | Rotation of inertial frames by angular momentum of matter and waves | 16 pages, 3 figures | 2017 Class. Quantum Grav. 34 205006 | 10.1088/1361-6382/aa8a34 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elucidate the dynamics of a thin spherical material shell with a
tangential pressure, using a new approach. This is both simpler than the
traditional method of extrinsic curvature junction conditions (which we also
employ), and suggests an expression for a `gravitational potential energy' of
the shell. Such a shel... | [
{
"created": "Sat, 28 Oct 2017 00:38:22 GMT",
"version": "v1"
}
] | 2017-10-31 | [
[
"Barker",
"William",
""
],
[
"Ledvinka",
"Tomáš",
""
],
[
"Lynden-Bell",
"Donald",
""
],
[
"Bičák",
"Jiří",
""
]
] | We elucidate the dynamics of a thin spherical material shell with a tangential pressure, using a new approach. This is both simpler than the traditional method of extrinsic curvature junction conditions (which we also employ), and suggests an expression for a `gravitational potential energy' of the shell. Such a shell,... |
2403.05682 | Chen-Kai Qiao | Chen-Kai Qiao and Ping Su | Time Delay of Light in the Gravitational lensing of Supermassive Black
Holes in Dark Matter Halos | 22 pages, 7 figures, 2 Appendices V2: some errors are corrected; V3:
major revision, two appendices added | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dark matter halo has non-negligible effects on the gravitational lensing
of supermassive black hole in the galaxy center. Our work presents a study on
the time-delay of light in gravitational lensing of black holes enclosed by
dark matter halos. To provide a precise description on the distribution of dark
matter ... | [
{
"created": "Fri, 8 Mar 2024 21:26:24 GMT",
"version": "v1"
},
{
"created": "Sun, 12 May 2024 08:15:27 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Aug 2024 02:24:06 GMT",
"version": "v3"
}
] | 2024-08-13 | [
[
"Qiao",
"Chen-Kai",
""
],
[
"Su",
"Ping",
""
]
] | The dark matter halo has non-negligible effects on the gravitational lensing of supermassive black hole in the galaxy center. Our work presents a study on the time-delay of light in gravitational lensing of black holes enclosed by dark matter halos. To provide a precise description on the distribution of dark matter in... |
1902.03378 | Arpit Das Indian Institute of Science Education and Research | Arpit Das and Narayan Banerjee | Unitarity in Reissner-Nordstr\"{o}m background: striding away from
information loss | 11 pages, no figure. Some clarifications. Main results unchanged | Eur. Phys. J. C (2019) 79: 475 | 10.1140/epjc/s10052-019-6991-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have shown analytically that radiation from a collapsing shell which leads
to a charged black hole, whose exterior is described by the RN
(Reissner-Nordstr\"om) metric (and hence the background spacetime is
non-globally hyperbolic), is processed with a unitary evolution. For the
analysis, we have used the Wheeler-... | [
{
"created": "Sat, 9 Feb 2019 06:16:37 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2019 09:36:18 GMT",
"version": "v2"
}
] | 2019-06-19 | [
[
"Das",
"Arpit",
""
],
[
"Banerjee",
"Narayan",
""
]
] | We have shown analytically that radiation from a collapsing shell which leads to a charged black hole, whose exterior is described by the RN (Reissner-Nordstr\"om) metric (and hence the background spacetime is non-globally hyperbolic), is processed with a unitary evolution. For the analysis, we have used the Wheeler-de... |
1012.1556 | Stefano Finazzi | Stefano Finazzi and Renaud Parentani | Spectral properties of acoustic black hole radiation: Broadening the
horizon | 12 pages, 12 figures, revtex4, minor corrections, version accepted on
prd | Phys.Rev.D83:084010,2011 | 10.1103/PhysRevD.83.084010 | null | gr-qc cond-mat.quant-gas | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sensitivity of the black hole spectrum when introducing short distance
dispersion is studied in the context of atomic Bose condensates. By considering
flows characterized by several length scales, we show that, while the spectrum
remains remarkably Planckian, the temperature is no longer fixed by the surface
grav... | [
{
"created": "Tue, 7 Dec 2010 17:15:54 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2011 18:59:58 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Finazzi",
"Stefano",
""
],
[
"Parentani",
"Renaud",
""
]
] | The sensitivity of the black hole spectrum when introducing short distance dispersion is studied in the context of atomic Bose condensates. By considering flows characterized by several length scales, we show that, while the spectrum remains remarkably Planckian, the temperature is no longer fixed by the surface gravit... |
1009.2161 | Edward Anderson | Edward Anderson | Shape Quantities for Relational Quadrilateralland | Seminar I on relational quadrilaterals (2-d 4-body problem as a
whole-universe model in the absense of all absolute connotations). The set of
shape quantities given here was found to be incomplete, as pointed out and
completed in arXiv:1202.4186 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I investigate useful shape quantities for the classical and quantum mechanics
of the relational quadrilateral in 2-d. This is relational in the sense that
only relative times, relative ratios of separations and relative angles are
significant. Relational particle mechanics models such as this paper's have
many analog... | [
{
"created": "Sat, 11 Sep 2010 12:16:47 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Oct 2010 14:15:58 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jan 2011 01:28:28 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Aug 2013 00:25:57 GMT",
"version": "v4"
}
] | 2013-08-08 | [
[
"Anderson",
"Edward",
""
]
] | I investigate useful shape quantities for the classical and quantum mechanics of the relational quadrilateral in 2-d. This is relational in the sense that only relative times, relative ratios of separations and relative angles are significant. Relational particle mechanics models such as this paper's have many analogie... |
0911.1634 | Eva Hackmann | E. Hackmann, V. Kagramanova, J. Kunz, C. L\"ammerzahl | Analytic solutions of the geodesic equation in axially symmetric
space-times | 4 pages, 4 figures, accepted for publication in EPL | Europhys.Lett.88:30008,2009 | 10.1209/0295-5075/88/30008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The complete sets of analytic solutions of the geodesic equation in
Taub--NUT--(anti-)de Sitter, Kerr--(anti-)de Sitter and also in general
Plebanski--Demianski space--times without acceleration are presented. The
solutions are given in terms of the Kleinian sigma functions.
| [
{
"created": "Mon, 9 Nov 2009 12:28:08 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Hackmann",
"E.",
""
],
[
"Kagramanova",
"V.",
""
],
[
"Kunz",
"J.",
""
],
[
"Lämmerzahl",
"C.",
""
]
] | The complete sets of analytic solutions of the geodesic equation in Taub--NUT--(anti-)de Sitter, Kerr--(anti-)de Sitter and also in general Plebanski--Demianski space--times without acceleration are presented. The solutions are given in terms of the Kleinian sigma functions. |
2301.12103 | Li Tang | Hai-Nan Lin and Li Tang and Rui Zou | Revised constraints on the photon mass from well-localized fast radio
bursts | 9 pages, 4 figures | MNRAS 520, 1324-1331 (2023) | 10.1093/mnras/stad228 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constrain the photon mass from well-localized fast radio bursts (FRBs)
using Bayes inference method. The probability distributions of dispersion
measures (DM) of host galaxy and intergalactic medium are properly taken into
account. The photon mass is tightly constrained from 17 well-localized FRBs in
the redshift ... | [
{
"created": "Sat, 28 Jan 2023 06:09:31 GMT",
"version": "v1"
}
] | 2023-09-21 | [
[
"Lin",
"Hai-Nan",
""
],
[
"Tang",
"Li",
""
],
[
"Zou",
"Rui",
""
]
] | We constrain the photon mass from well-localized fast radio bursts (FRBs) using Bayes inference method. The probability distributions of dispersion measures (DM) of host galaxy and intergalactic medium are properly taken into account. The photon mass is tightly constrained from 17 well-localized FRBs in the redshift ra... |
1105.1008 | Zohre Azarmi | F. Adabi, K. Karami, F. Felegary, Z. Azarmi | Interacting viscous entropy-corrected holographic scalar field models of
dark energy with time-varying G in modified FRW cosmology | 14 pages, Accepted for publication in Research in Astronomy and
Astrophysics | Res. Astron. Astrophys. 12 (2012) 26 | 10.1088/1674-4527/12/1/002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the entropy-corrected version of the holographic dark energy (HDE)
model in the framework of modified FRW cosmology. We consider a non-flat
universe filled with an interacting viscous entropy-corrected HDE (ECHDE) with
dark matter. We also include the case of variable gravitational constant G in
our model. W... | [
{
"created": "Thu, 5 May 2011 08:13:58 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2011 16:45:11 GMT",
"version": "v2"
}
] | 2012-01-30 | [
[
"Adabi",
"F.",
""
],
[
"Karami",
"K.",
""
],
[
"Felegary",
"F.",
""
],
[
"Azarmi",
"Z.",
""
]
] | We study the entropy-corrected version of the holographic dark energy (HDE) model in the framework of modified FRW cosmology. We consider a non-flat universe filled with an interacting viscous entropy-corrected HDE (ECHDE) with dark matter. We also include the case of variable gravitational constant G in our model. We ... |
gr-qc/9506094 | Dr. sayan Kar | Sayan Kar and Deshdeep Sahdev | Evolving Lorentzian Wormholes | 10 pages( RevTex, Twocolumn format), Two figures available on request
from the first author. transmission errors corrected. | Phys.Rev. D53 (1996) 722-730 | 10.1103/PhysRevD.53.722 | IP--BBSR--95/38 | gr-qc | null | Evolving Lorentzian wormholes with the required matter satisfying the Energy
conditions are discussed. Several different scale factors are used and the
corresponding consequences derived. The effect of extra, decaying (in time)
compact dimensions present in the wormhole metric is also explored and certain
interesting... | [
{
"created": "Thu, 29 Jun 1995 19:47:22 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 1995 21:48:24 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jul 1995 18:57:22 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Kar",
"Sayan",
""
],
[
"Sahdev",
"Deshdeep",
""
]
] | Evolving Lorentzian wormholes with the required matter satisfying the Energy conditions are discussed. Several different scale factors are used and the corresponding consequences derived. The effect of extra, decaying (in time) compact dimensions present in the wormhole metric is also explored and certain interesting c... |
gr-qc/9710065 | I. H. Dwivedi | I. H. Dwivedi | Field of a Radiation Distributuion | Latex file, 13 pages, no figures. Accepted for publication in Phys.
Rev. D | Phys.Rev. D58 (1998) 084029 | 10.1103/PhysRevD.58.084029 | null | gr-qc | null | General relativistic spherically symmetric matter field with a vanishing
stress energy scalar is analyzed. Procedure for generating exact solutions of
the field equations for such matter distributions is given. It is further
pointed out that all such type I spherically symmetric fields with distinct
eignvalues in the... | [
{
"created": "Sun, 12 Oct 1997 11:00:24 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Jun 1998 09:08:33 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Dwivedi",
"I. H.",
""
]
] | General relativistic spherically symmetric matter field with a vanishing stress energy scalar is analyzed. Procedure for generating exact solutions of the field equations for such matter distributions is given. It is further pointed out that all such type I spherically symmetric fields with distinct eignvalues in the r... |
gr-qc/0610071 | Timothy Clifton | T. Clifton | Alternative Theories of Gravity | 205 pages. PhD thesis | null | null | null | gr-qc astro-ph hep-th | null | This work investigates alternative theories of gravity, the solutions to
their field equations and the constraints that can be imposed upon them from
observation and experiment. Specifically, we consider the cosmologies and
spherically symmetric solutions that can be expected to result from
scalar-tensor and fourth-o... | [
{
"created": "Fri, 13 Oct 2006 18:17:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Clifton",
"T.",
""
]
] | This work investigates alternative theories of gravity, the solutions to their field equations and the constraints that can be imposed upon them from observation and experiment. Specifically, we consider the cosmologies and spherically symmetric solutions that can be expected to result from scalar-tensor and fourth-ord... |
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