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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1009.0589 | Olivier Sarbach | Oscar Reula and Olivier Sarbach | The Initial-Boundary Value Problem in General Relativity | 11 pages, 2 figures. Contribution to a special volume for Mario
Castagnino's seventy fifth birthday | Int.J.Mod.Phys.D20:767-783,2011 | 10.1142/S0218271811019116 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we summarize what is known about the initial-boundary value
problem for general relativity and discuss present problems related to it.
| [
{
"created": "Fri, 3 Sep 2010 05:25:46 GMT",
"version": "v1"
}
] | 2011-05-25 | [
[
"Reula",
"Oscar",
""
],
[
"Sarbach",
"Olivier",
""
]
] | In this article we summarize what is known about the initial-boundary value problem for general relativity and discuss present problems related to it. |
1208.2146 | Hyeong-Chan Kim | Inyong Cho, Hyeong-Chan Kim, and Taeyoon Moon | Universe Driven by Perfect Fluid in Eddington-inspired Born-Infeld
Gravity | 24 pages, 5 figures | PRD 86, 084018 (2002) | 10.1103/PhysRevD.86.084018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the evolution of the Universe filled with barotropic perfect
fluid in Eddington-inspired Born-Infeld gravity. We consider both the isotropic
and the anisotropic universe. At the early stage when the energy density is
high, the evolution is modified considerably compared with that in general
relativity.... | [
{
"created": "Fri, 10 Aug 2012 11:27:46 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Cho",
"Inyong",
""
],
[
"Kim",
"Hyeong-Chan",
""
],
[
"Moon",
"Taeyoon",
""
]
] | We investigate the evolution of the Universe filled with barotropic perfect fluid in Eddington-inspired Born-Infeld gravity. We consider both the isotropic and the anisotropic universe. At the early stage when the energy density is high, the evolution is modified considerably compared with that in general relativity. F... |
1308.2550 | Jozef Skakala | Jozef Skakala | Quantization of horizon entropy and the thermodynamics of spacetime | 24 pages, (invited) review of some of my previous published results
with some new arguments / results added | Braz.Jour.Phys. 44, 2-3, 2014, p. 291-304 | 10.1007/s13538-014-0177-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a review of my work published in the papers [1-4]. It offers a more
detailed discussion of the results than what was given in the published papers
and it links my results to some conclusions recently made by other people. It
also offers some new arguments for the conclusions previously made. The
fundamental i... | [
{
"created": "Mon, 12 Aug 2013 13:16:45 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2013 01:16:05 GMT",
"version": "v2"
}
] | 2014-06-03 | [
[
"Skakala",
"Jozef",
""
]
] | This is a review of my work published in the papers [1-4]. It offers a more detailed discussion of the results than what was given in the published papers and it links my results to some conclusions recently made by other people. It also offers some new arguments for the conclusions previously made. The fundamental ide... |
2002.03603 | Wen-Hong Ruan | Wen-Hong Ruan, Chang Liu, Zong-Kuan Guo, Yue-Liang Wu, Rong-Gen Cai | The LISA-Taiji network | 6 pages. 2 figures | Nature Astronomy 4 (2020) 108-109 | 10.1038/s41550-019-1008-4 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both LISA and Taiji, planned space-based gravitational-wave detectors in
orbit around the Sun, are expected to launch in 2030-2035. Assuming a one-year
overlap, we explore a potential LISA-Taiji network to fast and accurately
localize the gravitational-wave sources.
| [
{
"created": "Mon, 10 Feb 2020 08:43:08 GMT",
"version": "v1"
}
] | 2020-02-11 | [
[
"Ruan",
"Wen-Hong",
""
],
[
"Liu",
"Chang",
""
],
[
"Guo",
"Zong-Kuan",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Cai",
"Rong-Gen",
""
]
] | Both LISA and Taiji, planned space-based gravitational-wave detectors in orbit around the Sun, are expected to launch in 2030-2035. Assuming a one-year overlap, we explore a potential LISA-Taiji network to fast and accurately localize the gravitational-wave sources. |
2005.05258 | Antonio Ferreiro | Antonio Ferreiro and Jose Navarro-Salas | Running gravitational couplings, decoupling, and curved spacetime
renormalization | Some points clarified, misprints corrected; to appear in Phys. Rev. D | Phys. Rev. D 102, 045021 (2020) | 10.1103/PhysRevD.102.045021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to slightly generalize the DeWitt-Schwinger adiabatic
renormalization subtractions in curved space to include an arbitrary
renormalization mass scale $\mu$. The new predicted running for the
gravitational couplings are fully consistent with decoupling of heavy massive
fields. This is a somewhat improvement... | [
{
"created": "Mon, 11 May 2020 16:59:04 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 2020 16:20:39 GMT",
"version": "v2"
}
] | 2020-09-02 | [
[
"Ferreiro",
"Antonio",
""
],
[
"Navarro-Salas",
"Jose",
""
]
] | We propose to slightly generalize the DeWitt-Schwinger adiabatic renormalization subtractions in curved space to include an arbitrary renormalization mass scale $\mu$. The new predicted running for the gravitational couplings are fully consistent with decoupling of heavy massive fields. This is a somewhat improvement w... |
2205.00654 | Wei Sun | Wei Sun, Xian-Hui Ge | Holographic heat engine efficiency of hyperbolic charged black holes | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider a four-dimensional charged hyperbolic black hole as working
matter to establish a black hole holographic heat engine, and use the
rectangular cycle to obtain the heat engine efficiency. We find that when the
increasing of entropy is zero, the heat engine efficiency of the hyperbolic
black hole becomes the... | [
{
"created": "Mon, 2 May 2022 04:59:03 GMT",
"version": "v1"
}
] | 2022-05-03 | [
[
"Sun",
"Wei",
""
],
[
"Ge",
"Xian-Hui",
""
]
] | We consider a four-dimensional charged hyperbolic black hole as working matter to establish a black hole holographic heat engine, and use the rectangular cycle to obtain the heat engine efficiency. We find that when the increasing of entropy is zero, the heat engine efficiency of the hyperbolic black hole becomes the w... |
gr-qc/0106042 | Naresh Dadhich | Z. Ya. Turakulov and N. Dadhich | A stationary vacuum solution dual to the Kerr solution | Latex, 4 pages, minor modifications in title and discussion. Accepted
in Mod. Phys. Lett. A | Mod.Phys.Lett. A16 (2001) 1959-1962 | 10.1142/S0217732301005084 | IUCAA-30/2001 | gr-qc | null | We present a stationary axially symmetric two parameter vacuum solution which
could be considered as ``dual'' to the Kerr solution. It is obtained by
removing the mass parameter from the function of the radial coordinate and
introducing a dimensionless parameter in the function of the angle coordinate
in the metric f... | [
{
"created": "Wed, 13 Jun 2001 14:10:39 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Sep 2001 05:08:01 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Turakulov",
"Z. Ya.",
""
],
[
"Dadhich",
"N.",
""
]
] | We present a stationary axially symmetric two parameter vacuum solution which could be considered as ``dual'' to the Kerr solution. It is obtained by removing the mass parameter from the function of the radial coordinate and introducing a dimensionless parameter in the function of the angle coordinate in the metric fun... |
gr-qc/0702128 | Michael P. Ryan jr | L. Ort\'iz and M. P. Ryan Jr | The complete quantum collapse scenario of 2+1 dust shell: Preliminary
Calculations | 28 pages, 13 figures, to appear in the proceedings of NEB XII,
Nauplion, Greece | J.Phys.Conf.Ser.68:012047,2007 | 10.1088/1742-6596/68/1/012047 | null | gr-qc | null | If we consider the gravitational collapse of a material object to a black
hole, we would expect, for ranges of mass where a black hole would form, the
following scenario. A large enough object would collapse classically until an
event horizon forms, and to an external observer the object would be lost fom
view. Howev... | [
{
"created": "Sat, 24 Feb 2007 03:20:43 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ortíz",
"L.",
""
],
[
"Ryan",
"M. P.",
"Jr"
]
] | If we consider the gravitational collapse of a material object to a black hole, we would expect, for ranges of mass where a black hole would form, the following scenario. A large enough object would collapse classically until an event horizon forms, and to an external observer the object would be lost fom view. However... |
gr-qc/9707033 | Daniel STAF Tilley | Roy Maartens and Daniel Tilley (Portsmouth University) | Exact Perturbations for inflation with smooth exit | Minor errors corrected | Gen.Rel.Grav. 30 (1998) 289-297; Erratum-ibid. 30 (1998) 519 | 10.1023/A:1018852929430 | null | gr-qc | null | Toy models for the Hubble rate or the scalar field potential have been used
to analyze the amplification of scalar perturbations through a smooth
transition from inflation to the radiation era. We use a Hubble rate that
arises consistently from a decaying vacuum cosmology, which evolves smoothly
from nearly de Sitter... | [
{
"created": "Tue, 15 Jul 1997 12:25:39 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Apr 1998 11:28:25 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Maartens",
"Roy",
"",
"Portsmouth University"
],
[
"Tilley",
"Daniel",
"",
"Portsmouth University"
]
] | Toy models for the Hubble rate or the scalar field potential have been used to analyze the amplification of scalar perturbations through a smooth transition from inflation to the radiation era. We use a Hubble rate that arises consistently from a decaying vacuum cosmology, which evolves smoothly from nearly de Sitter i... |
gr-qc/0010001 | Roh Suan Tung | Roh S. Tung (CIPA and Univ of Chicago), James M. Nester (National
Central Univ, Taiwan) | Gravitational Energy-Momentum in the Tetrad and Quadratic Spinor
Representations of General Relativity | 9 pages. Proceedings of the Vigier III Symposium (August 21-25, 2000,
U. C. Berkeley), Kluwer Academic, to be published | null | null | null | gr-qc hep-th | null | In the Tetrad Representation of General Relativity, the energy-momentum
expression, found by Moller in 1961, is a tensor wrt coordinate transformations
but is not a tensor wrt local Lorentz frame rotations. This local Lorentz
freedom is shown to be the same as the six parameter normalized spinor degrees
of freedom in... | [
{
"created": "Sun, 1 Oct 2000 05:31:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tung",
"Roh S.",
"",
"CIPA and Univ of Chicago"
],
[
"Nester",
"James M.",
"",
"National\n Central Univ, Taiwan"
]
] | In the Tetrad Representation of General Relativity, the energy-momentum expression, found by Moller in 1961, is a tensor wrt coordinate transformations but is not a tensor wrt local Lorentz frame rotations. This local Lorentz freedom is shown to be the same as the six parameter normalized spinor degrees of freedom in t... |
1104.1383 | Steinar Johannesen | Oyvind Gron and Steinar Johannesen | A solution of the Einstein-Maxwell equations describing conformally flat
spacetime outside a charged domain wall | 11 pages, 0 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive and discuss the physical interpretation of a conformally flat,
static solution of the Einstein-Maxwell equations. It is argued that it
describes a conformally flat, static spacetime outside a charged spherically
symmetric domain wall. The acceleration of gravity is directed away from the
wall in spite of th... | [
{
"created": "Thu, 7 Apr 2011 17:08:14 GMT",
"version": "v1"
}
] | 2011-04-08 | [
[
"Gron",
"Oyvind",
""
],
[
"Johannesen",
"Steinar",
""
]
] | We derive and discuss the physical interpretation of a conformally flat, static solution of the Einstein-Maxwell equations. It is argued that it describes a conformally flat, static spacetime outside a charged spherically symmetric domain wall. The acceleration of gravity is directed away from the wall in spite of the ... |
1008.1803 | Lee Lindblom | Lee Lindblom, John G. Baker, and Benjamin J. Owen | Improved Time-Domain Accuracy Standards for Model Gravitational
Waveforms | 10 pages, 5 figures | Phys.Rev.D82:084020,2010 | 10.1103/PhysRevD.82.084020 | LIGO Document Number LIGO-P1000078-v2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Model gravitational waveforms must be accurate enough to be useful for
detection of signals and measurement of their parameters, so appropriate
accuracy standards are needed. Yet these standards should not be unnecessarily
restrictive, making them impractical for the numerical and analytical modelers
to meet. The wor... | [
{
"created": "Tue, 10 Aug 2010 20:43:17 GMT",
"version": "v1"
}
] | 2011-05-04 | [
[
"Lindblom",
"Lee",
""
],
[
"Baker",
"John G.",
""
],
[
"Owen",
"Benjamin J.",
""
]
] | Model gravitational waveforms must be accurate enough to be useful for detection of signals and measurement of their parameters, so appropriate accuracy standards are needed. Yet these standards should not be unnecessarily restrictive, making them impractical for the numerical and analytical modelers to meet. The work ... |
gr-qc/9911107 | Julio Cesar Fabris | M. Azreg-Ainou, G. Clement, C.P. Constantinidis and J.C. Fabris | Electrostatic solutions in Kaluza-Klein theory: geometry and stability | Latex file, 21 pages | Grav.Cosmol.6:207-218,2000 | null | null | gr-qc hep-th | null | We investigate the family of electrostatic spherically symmetric solutions of
the five-dimensional Kaluza-Klein theory. Both charged and neutral cases are
considered. The analysis of the solutions, through their geometrical
properties, reveals the existence of black holes, wormholes and naked
singularities. A new cla... | [
{
"created": "Fri, 26 Nov 1999 14:45:37 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Azreg-Ainou",
"M.",
""
],
[
"Clement",
"G.",
""
],
[
"Constantinidis",
"C. P.",
""
],
[
"Fabris",
"J. C.",
""
]
] | We investigate the family of electrostatic spherically symmetric solutions of the five-dimensional Kaluza-Klein theory. Both charged and neutral cases are considered. The analysis of the solutions, through their geometrical properties, reveals the existence of black holes, wormholes and naked singularities. A new class... |
1005.0294 | D. Petroff | Stefan Horatschek and David Petroff | Uniformly Rotating Homogeneous Rings in post-Newtonian Gravity | 12 pages, 7 figures, v1: 2 tables added, agrees with published
version | Mon. Not. R. Astron. Soc., vol. 408, p. 1749 (2010) | 10.1111/j.1365-2966.2010.17241.x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper uniformly rotating relativistic rings are investigated
analytically utilizing two different approximations simultaneously: (1) an
expansion about the thin ring limit (the cross-section is small compared with
the size of the whole ring) (2) post-Newtonian expansions. The analytic results
for rings are co... | [
{
"created": "Mon, 3 May 2010 13:50:09 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Dec 2010 19:15:03 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Horatschek",
"Stefan",
""
],
[
"Petroff",
"David",
""
]
] | In this paper uniformly rotating relativistic rings are investigated analytically utilizing two different approximations simultaneously: (1) an expansion about the thin ring limit (the cross-section is small compared with the size of the whole ring) (2) post-Newtonian expansions. The analytic results for rings are comp... |
gr-qc/9509021 | null | Dmitri V. Vasilevich | Gauge-invariance in one-loop quantum cosmology | LATeX, 8 pages | null | null | Talk at VI Semin. on Quantum Gravity | gr-qc | null | We study the problem of gauge-invariance and gauge-dependence in one-loop
quantum cosmology. We formulate some requirements which should be satisfied by
boundary conditions in order to give gauge-independent path integral. The case
of QED is studied in some detail. We outline difficulties in gauge-invariant
quantizat... | [
{
"created": "Sat, 9 Sep 1995 20:57:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vasilevich",
"Dmitri V.",
""
]
] | We study the problem of gauge-invariance and gauge-dependence in one-loop quantum cosmology. We formulate some requirements which should be satisfied by boundary conditions in order to give gauge-independent path integral. The case of QED is studied in some detail. We outline difficulties in gauge-invariant quantizatio... |
gr-qc/0601089 | Christian Boehmer | Christian G. Boehmer, Piotr Bronowski | The homogeneous and isotropic Weyssenhoff fluid | 9 pages, invited submission by UJP; revised acknowledgements | Ukr.J.Phys. 55 (2010) 607-612 | null | ASGBG/CIU Preprint: 22.01.2006B | gr-qc | null | We consider a Weyssenhoff fluid assuming that the spacetime is homogeneous
and isotropic, therefore being relevant for cosmological considerations of
gravity theories with torsion. In this paper, it is explicitely shown that the
Weyssenhoff fluids obeying the Frenkel condition or the Papapetrou-Corinaldesi
condition ... | [
{
"created": "Mon, 23 Jan 2006 05:52:29 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2006 04:58:52 GMT",
"version": "v2"
}
] | 2010-05-21 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Bronowski",
"Piotr",
""
]
] | We consider a Weyssenhoff fluid assuming that the spacetime is homogeneous and isotropic, therefore being relevant for cosmological considerations of gravity theories with torsion. In this paper, it is explicitely shown that the Weyssenhoff fluids obeying the Frenkel condition or the Papapetrou-Corinaldesi condition ar... |
0805.1908 | Cenalo Vaz | Cenalo Vaz and K. R. Koehler | A Rotating, Inhomogeneous Dust Interior for the BTZ Black Hole | 16 pages, no figures | Phys.Rev.D78:024038,2008 | 10.1103/PhysRevD.78.024038 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present exact solutions describing rotating, inhomogeneous dust with
generic initial data in 2+1 dimensional AdS spacetime and show how they are
smoothly matched to the Banados-Teitelboim-Zanelli (BTZ) solution in the
exterior. The metrics, which are the rotational analogues of the 2+1
dimensional LeMaitre-Tolman-... | [
{
"created": "Tue, 13 May 2008 19:08:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Vaz",
"Cenalo",
""
],
[
"Koehler",
"K. R.",
""
]
] | We present exact solutions describing rotating, inhomogeneous dust with generic initial data in 2+1 dimensional AdS spacetime and show how they are smoothly matched to the Banados-Teitelboim-Zanelli (BTZ) solution in the exterior. The metrics, which are the rotational analogues of the 2+1 dimensional LeMaitre-Tolman-Bo... |
0912.1433 | \"Ozg\"ur Acik | \"Umit Ertem, \"Ozg\"ur A\c{c}{\i}k | Generalized Chern-Simons Modified Gravity in First-Order Formalism | 8 pages, an author added, new paragraphs, comments and references
added, published in Gen. Relativ. Gravit | Gen. Relativ. Gravit. 45, 477 (2013) | 10.1007/s10714-012-1483-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a generalization of Chern-Simons (CS) modified gravity in
first-order formalism. CS modified gravity action has a term that comes from
the chiral anomaly which is Pontryagin invariant. First-order CS modified
gravity is a torsional theory and in a space-time with torsion the chiral
anomaly includes a torsi... | [
{
"created": "Tue, 8 Dec 2009 08:47:40 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Nov 2012 06:03:33 GMT",
"version": "v2"
}
] | 2016-08-14 | [
[
"Ertem",
"Ümit",
""
],
[
"Açık",
"Özgür",
""
]
] | We propose a generalization of Chern-Simons (CS) modified gravity in first-order formalism. CS modified gravity action has a term that comes from the chiral anomaly which is Pontryagin invariant. First-order CS modified gravity is a torsional theory and in a space-time with torsion the chiral anomaly includes a torsion... |
1309.1252 | Patryk Mach | Patryk Mach, Edward Malec, Janusz Karkowski | Spherical steady accretion flows -- dependence on the cosmological
constant, exact isothermal solutions and applications to cosmology | 19 pages, 10 figures | Phys. Rev. D 88, 084056 (2013) | 10.1103/PhysRevD.88.084056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate spherical, isothermal and polytropic steady accretion models
in the presence of the cosmological constant. Exact solutions are found for
three classes of isothermal fluids, assuming the test gas approximation. The
cosmological constant damps the mass accretion rate and - above certain limit -
completel... | [
{
"created": "Thu, 5 Sep 2013 07:51:19 GMT",
"version": "v1"
}
] | 2013-11-13 | [
[
"Mach",
"Patryk",
""
],
[
"Malec",
"Edward",
""
],
[
"Karkowski",
"Janusz",
""
]
] | We investigate spherical, isothermal and polytropic steady accretion models in the presence of the cosmological constant. Exact solutions are found for three classes of isothermal fluids, assuming the test gas approximation. The cosmological constant damps the mass accretion rate and - above certain limit - completely ... |
1406.6884 | Hor\'acio Vieira | H. S. Vieira, V. B. Bezerra | Acoustic black holes: massless scalar field analytic solutions and
analogue Hawking radiation | 26 pages, with erratum. arXiv admin note: text overlap with
arXiv:1405.7846 | Gen Relativ Gravit (2016) 48:88, Gen Relativ Gravit (2019) 51:51 | 10.1007/s10714-016-2082-x, 10.1007/s10714-019-2529-y | null | gr-qc cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the analytic solutions of the radial part of the massless
Klein-Gordon equation in the spacetime of both three dimensional rotating and
four dimensional canonical acoustic black holes, which are given in terms of
the confluent Heun functions. From these solutions, we obtain the scalar waves
near the acousti... | [
{
"created": "Thu, 26 Jun 2014 13:38:36 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 2015 13:20:25 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Jun 2016 13:26:55 GMT",
"version": "v3"
},
{
"created": "Sat, 6 Apr 2019 20:51:56 GMT",
"version": "v4"
}
] | 2019-04-10 | [
[
"Vieira",
"H. S.",
""
],
[
"Bezerra",
"V. B.",
""
]
] | We obtain the analytic solutions of the radial part of the massless Klein-Gordon equation in the spacetime of both three dimensional rotating and four dimensional canonical acoustic black holes, which are given in terms of the confluent Heun functions. From these solutions, we obtain the scalar waves near the acoustic ... |
1905.00451 | Manuel Hohmann | Manuel Hohmann | Disformal Transformations in Scalar-Torsion Gravity | LaTeX, 11 pages. Contribution to the proceedings of the conference
"Teleparallel Universes" in Salamanca 26-28 November 2018; published version | Universe 5 (2019) 167 | 10.3390/universe5070167 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study disformal transformations in the context of scalar extensions to
teleparallel gravity, in which the gravitational interaction is mediated by the
torsion of a flat, metric compatible connection. We find a generic class of
scalar-torsion actions which is invariant under disformal transformations, and
which pos... | [
{
"created": "Wed, 1 May 2019 19:02:48 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2019 16:10:24 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Hohmann",
"Manuel",
""
]
] | We study disformal transformations in the context of scalar extensions to teleparallel gravity, in which the gravitational interaction is mediated by the torsion of a flat, metric compatible connection. We find a generic class of scalar-torsion actions which is invariant under disformal transformations, and which posse... |
gr-qc/0211109 | Roche Philippe | Karim Noui, Philippe Roche | Cosmological Deformation of Lorentzian Spin Foam Models | 37 pages, 7 figures included | Class.Quant.Grav.20:3175-3214,2003 | 10.1088/0264-9381/20/14/318 | null | gr-qc hep-th | null | We study the quantum deformation of the Barrett-Crane Lorentzian spin foam
model which is conjectured to be the discretization of Lorentzian Plebanski
model with positive cosmological constant and includes therefore as a
particular sector quantum gravity in de-Sitter space. This spin foam model is
constructed using h... | [
{
"created": "Fri, 29 Nov 2002 17:25:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Noui",
"Karim",
""
],
[
"Roche",
"Philippe",
""
]
] | We study the quantum deformation of the Barrett-Crane Lorentzian spin foam model which is conjectured to be the discretization of Lorentzian Plebanski model with positive cosmological constant and includes therefore as a particular sector quantum gravity in de-Sitter space. This spin foam model is constructed using har... |
0710.5155 | Gilberto Medeiros Kremer | M. O. Ribas, F. P. Devecchi and G. M. Kremer | Cosmological model with non-minimally coupled fermionic field | Accepted for publication in Europhysics Letters | Europhys.Lett.81:19001,2008 | 10.1209/0295-5075/81/19001 | null | gr-qc | null | A model for the Universe is proposed whose constituents are: (a) a dark
energy field modeled by a fermionic field non-minimally coupled with the
gravitational field, (b) a matter field which consists of pressureless baryonic
and dark matter fields and (c) a field which represents the radiation and the
neutrinos. The ... | [
{
"created": "Fri, 26 Oct 2007 17:55:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ribas",
"M. O.",
""
],
[
"Devecchi",
"F. P.",
""
],
[
"Kremer",
"G. M.",
""
]
] | A model for the Universe is proposed whose constituents are: (a) a dark energy field modeled by a fermionic field non-minimally coupled with the gravitational field, (b) a matter field which consists of pressureless baryonic and dark matter fields and (c) a field which represents the radiation and the neutrinos. The co... |
gr-qc/9709064 | Jemal Guven | Jemal Guven and Niall O Murchadha | Geometric Bounds in Spherically Symmetric General Relativity | 16 pages, revtex, submitted to Phys. Rev. D | Phys.Rev. D56 (1997) 7650-7657 | 10.1103/PhysRevD.56.7650 | null | gr-qc | null | We exploit an arbitrary extrinsic time foliation of spacetime to solve the
constraints in spherically symmetric general relativity. Among such foliations
there is a one parameter family, linear and homogeneous in the extrinsic
curvature, which permit the momentum constraint to be solved exactly. This
family includes,... | [
{
"created": "Wed, 24 Sep 1997 22:13:13 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Guven",
"Jemal",
""
],
[
"Murchadha",
"Niall O",
""
]
] | We exploit an arbitrary extrinsic time foliation of spacetime to solve the constraints in spherically symmetric general relativity. Among such foliations there is a one parameter family, linear and homogeneous in the extrinsic curvature, which permit the momentum constraint to be solved exactly. This family includes, a... |
gr-qc/9701029 | Kevin Chan | Kevin C.K. Chan (University of Waterloo) | Is mass conformally invariant? | 8 pages, Latex | null | null | WATPHY-TH-96/14 | gr-qc | null | By using the Garfinkle, Horowitz and Strominger black hole solutions as
examples, we illustrate that, with respect to the reference action functional
proposed by Hawking and Horowitz, the asymptotic mass parameter is not
invariant between two conformally related static spherically symmetric metrics.
| [
{
"created": "Tue, 14 Jan 1997 04:41:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chan",
"Kevin C. K.",
"",
"University of Waterloo"
]
] | By using the Garfinkle, Horowitz and Strominger black hole solutions as examples, we illustrate that, with respect to the reference action functional proposed by Hawking and Horowitz, the asymptotic mass parameter is not invariant between two conformally related static spherically symmetric metrics. |
2105.08930 | Deepali Agarwal | Deepali Agarwal, Jishnu Suresh, Sanjit Mitra, Anirban Ain | Upper limits on persistent gravitational waves using folded data and the
full covariance matrix from Advanced LIGO$'$s first two observing runs | 18 pages, 7 figures, published version with a revised figure and
clarified main text, results unchanged, typos and grammatical corrections | Phys. Rev. D 104, 123018 (2021) | 10.1103/PhysRevD.104.123018 | LIGO-P2000499 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stochastic gravitational-wave background (SGWB) created by astrophysical
sources in the nearby Universe is likely to be anisotropic. Upper limits on
SGWB anisotropy have been produced for all major data-taking runs by the
ground-based laser interferometric detectors. However, due to the challenges
involved in num... | [
{
"created": "Wed, 19 May 2021 05:24:47 GMT",
"version": "v1"
},
{
"created": "Sat, 13 May 2023 12:19:51 GMT",
"version": "v2"
}
] | 2023-07-18 | [
[
"Agarwal",
"Deepali",
""
],
[
"Suresh",
"Jishnu",
""
],
[
"Mitra",
"Sanjit",
""
],
[
"Ain",
"Anirban",
""
]
] | The stochastic gravitational-wave background (SGWB) created by astrophysical sources in the nearby Universe is likely to be anisotropic. Upper limits on SGWB anisotropy have been produced for all major data-taking runs by the ground-based laser interferometric detectors. However, due to the challenges involved in numer... |
2212.00312 | Ali Pourmand | Nakul Aggarwal, Ali Pourmand, Fatimah Shojai, Harish Parthasarathy | Constraining Generalized Chaplygin Gas in Non-Minimally Coupled $f(Q)$
Cosmology using Quasars and $H(z)$ Data | 17 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the current framework of Einstein's equations in general relativity (GR),
gravity is described by the spacetime curvature. However, there are other
descriptions where the origin of gravity can be understood through torsion and
non-metricity $Q$. In this work, we discuss a modified theory of gravity namely
$f(Q)$ g... | [
{
"created": "Thu, 1 Dec 2022 07:03:19 GMT",
"version": "v1"
}
] | 2022-12-02 | [
[
"Aggarwal",
"Nakul",
""
],
[
"Pourmand",
"Ali",
""
],
[
"Shojai",
"Fatimah",
""
],
[
"Parthasarathy",
"Harish",
""
]
] | In the current framework of Einstein's equations in general relativity (GR), gravity is described by the spacetime curvature. However, there are other descriptions where the origin of gravity can be understood through torsion and non-metricity $Q$. In this work, we discuss a modified theory of gravity namely $f(Q)$ gra... |
gr-qc/0211072 | L. C. Garcia de Andrade | L.C. Garcia de Andrade (Departamento de Fisica Teorica-IF-UERJ) | Spin polarised magnetized cylinder in torsioned spacetime | Latex file | Gen.Rel.Grav. 35 (2003) 1279-1283 | 10.1023/A:1024406009917 | null | gr-qc | null | A Spin-polarised cylindrically symmetric exact class of solutions endowed
with magnetic fields in Einstein-Cartan-Maxwell gravity is obtained.
Application of matching conditions to this interior solution having an exterior
as Einstein's vacuum solution shows that for this class of metrics the
Riemann-Cartan (RC) rota... | [
{
"created": "Fri, 22 Nov 2002 07:21:43 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"de Andrade",
"L. C. Garcia",
"",
"Departamento de Fisica Teorica-IF-UERJ"
]
] | A Spin-polarised cylindrically symmetric exact class of solutions endowed with magnetic fields in Einstein-Cartan-Maxwell gravity is obtained. Application of matching conditions to this interior solution having an exterior as Einstein's vacuum solution shows that for this class of metrics the Riemann-Cartan (RC) rotati... |
2103.16595 | Leonardo Gualtieri | Gon\c{c}alo Castro, Leonardo Gualtieri, Paolo Pani | Hidden symmetry between rotational tidal Love numbers of spinning
neutron stars | 13 pages, 2 figures; minor changes | Phys. Rev. D 104, 044052 (2021) | 10.1103/PhysRevD.104.044052 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The coupling between the angular momentum of a compact object and an external
tidal field gives rise to the "rotational" tidal Love numbers, which affect the
tidal deformability of a spinning self-gravitating body and enter the
gravitational waveform of a binary inspiral at high post-Newtonian order. We
provide numer... | [
{
"created": "Tue, 30 Mar 2021 18:07:02 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 18:20:31 GMT",
"version": "v2"
}
] | 2021-08-25 | [
[
"Castro",
"Gonçalo",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Pani",
"Paolo",
""
]
] | The coupling between the angular momentum of a compact object and an external tidal field gives rise to the "rotational" tidal Love numbers, which affect the tidal deformability of a spinning self-gravitating body and enter the gravitational waveform of a binary inspiral at high post-Newtonian order. We provide numeric... |
1210.7561 | P.A. Gonzalez | Ramon Becar, P. A. Gonzalez and Yerko Vasquez | Quasinormal modes and stability analysis for z=4 Topological black hole
in 4+1 dimensional Horava-Lifshitz gravity | 7 pages | null | 10.1142/S0218271813500077 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study z=4 Topological black hole in 4+1 dimensional Horava-Lifshitz
gravity and we calculate analytically the quasinormal modes of scalar
perturbations and from these quasinormal modes we show that z=4 Topological
black hole in 4+1 dimensional Horava-Lifshitz gravity is stable.
| [
{
"created": "Mon, 29 Oct 2012 05:08:21 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Becar",
"Ramon",
""
],
[
"Gonzalez",
"P. A.",
""
],
[
"Vasquez",
"Yerko",
""
]
] | We study z=4 Topological black hole in 4+1 dimensional Horava-Lifshitz gravity and we calculate analytically the quasinormal modes of scalar perturbations and from these quasinormal modes we show that z=4 Topological black hole in 4+1 dimensional Horava-Lifshitz gravity is stable. |
1909.02890 | Noshad Khosravi Largani | Noshad Khosravi Largani, Mohammad Taghi Mirtorabi | Chameleon Mechanism in Inhomogeneous Astrophysical Objects | 5 pages, 3 figures, Proceedings of The XXIII International Scientific
Conference of Young Scientists and Specialists (AYSS-2019), Dubna, April
15-19, 2019 | AIP Conference Proceedings , Volume 2163, 090008 (2019) | 10.1063/1.5130130 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observational evidence implying the accelerated expansion of the universe has
been the motivation to develop various classes of modified gravity theories.
One of them uses the so-called "screening mechanism", which is successful in
reproducing the observed gravitational behavior in large scales as well as
being in ag... | [
{
"created": "Fri, 6 Sep 2019 13:24:10 GMT",
"version": "v1"
}
] | 2019-11-18 | [
[
"Largani",
"Noshad Khosravi",
""
],
[
"Mirtorabi",
"Mohammad Taghi",
""
]
] | Observational evidence implying the accelerated expansion of the universe has been the motivation to develop various classes of modified gravity theories. One of them uses the so-called "screening mechanism", which is successful in reproducing the observed gravitational behavior in large scales as well as being in agre... |
2112.12309 | Mehdi Shokri | Mehdi Shokri, Jafar Sadeghi, Ram\'on Herrera, Saeed Noori Gashti | Warm inflation with bulk viscous pressure for different solutions of an
anisotropic universe | 26 pages, 21 figures | null | null | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We study a warm inflationary model for different expansions assuming an
anisotropic universe described by Bianchi I metric. The universe is filled with
a scalar field or inflaton, radiation, and bulk viscous pressure. We carry out
the inflationary analysis for different solutions of such universe in two
different cas... | [
{
"created": "Thu, 23 Dec 2021 02:06:49 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2022 13:08:44 GMT",
"version": "v2"
}
] | 2022-02-07 | [
[
"Shokri",
"Mehdi",
""
],
[
"Sadeghi",
"Jafar",
""
],
[
"Herrera",
"Ramón",
""
],
[
"Gashti",
"Saeed Noori",
""
]
] | We study a warm inflationary model for different expansions assuming an anisotropic universe described by Bianchi I metric. The universe is filled with a scalar field or inflaton, radiation, and bulk viscous pressure. We carry out the inflationary analysis for different solutions of such universe in two different cases... |
gr-qc/0307109 | Piotr Chrusciel | P.T. Chrusciel, J. Jezierski, S. Leski | The Trautman-Bondi mass of initial data sets | latex2e, 51 pages in A4, minor typos corrected | Adv.Theor.Math.Phys. 8 (2004) 83-139 | null | null | gr-qc | null | We give a definition of mass for conformally compactifiable initial data
sets. The asymptotic conditions are compatible with existence of gravitational
radiation, and the compactifications are allowed to be polyhomogeneous. We show
that the resulting mass is a geometric invariant, and we prove positivity
thereof in t... | [
{
"created": "Fri, 25 Jul 2003 15:45:42 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 2004 16:43:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chrusciel",
"P. T.",
""
],
[
"Jezierski",
"J.",
""
],
[
"Leski",
"S.",
""
]
] | We give a definition of mass for conformally compactifiable initial data sets. The asymptotic conditions are compatible with existence of gravitational radiation, and the compactifications are allowed to be polyhomogeneous. We show that the resulting mass is a geometric invariant, and we prove positivity thereof in the... |
1906.00337 | Carlos A. S. Almeida | J. E. G. Silva, L. J. S. Sousa, W. T. Cruz, C. A. S. Almeida | Torsion braneworlds in a tensor-vector gravity | 19 pages, 12 figures. Modified text to match the accepted version in
International Journal of Modern Physics D | null | 10.1142/S0218271822500304 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the properties of gravity and bulk fields living in a torsion warped
braneworld. The torsion is driven by a background vector whose norm provides a
source for the bulk cosmological constant. For a vector as the derivative of a
scalar field, we find new isotropic and anisotropic thick brane geometries. We
ana... | [
{
"created": "Sun, 2 Jun 2019 04:03:36 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2022 14:24:28 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Mar 2022 02:41:51 GMT",
"version": "v3"
}
] | 2022-03-14 | [
[
"Silva",
"J. E. G.",
""
],
[
"Sousa",
"L. J. S.",
""
],
[
"Cruz",
"W. T.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] | We study the properties of gravity and bulk fields living in a torsion warped braneworld. The torsion is driven by a background vector whose norm provides a source for the bulk cosmological constant. For a vector as the derivative of a scalar field, we find new isotropic and anisotropic thick brane geometries. We analy... |
1607.03928 | Emre Dil Dr. | Emre Dil | Interacting dark matter and q-deformed dark energy non-minimally coupled
to gravity | null | Advances in High Energy Physics vol. 2016, Article ID 7380372, 17
pages, 2016 | 10.1155/2016/7380372 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we propose a new approach to study the dark sector of the
universe by considering the dark energy as emerging a q-deformed bosonic scalar
field which is not only interacting with the dark matter, but also
non-minimally coupled to gravity, in the framework of standard Einsteinian
gravity. In order to an... | [
{
"created": "Thu, 30 Jun 2016 13:17:32 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2016 17:19:04 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Nov 2016 10:28:36 GMT",
"version": "v3"
}
] | 2016-12-23 | [
[
"Dil",
"Emre",
""
]
] | In this paper, we propose a new approach to study the dark sector of the universe by considering the dark energy as emerging a q-deformed bosonic scalar field which is not only interacting with the dark matter, but also non-minimally coupled to gravity, in the framework of standard Einsteinian gravity. In order to anal... |
0801.4387 | Luis Lehner | Matthew Anderson, Eric W. Hirschmann, Luis Lehner, Steven L. Liebling,
Patrick M. Motl, David Neilsen, Carlos Palenzuela, Joel E. Tohline | Magnetized Neutron Star Mergers and Gravitational Wave Signals | Replaced with accepted PRL version. (Figures have been reduced in
quality) | Phys.Rev.Lett.100:191101,2008 | 10.1103/PhysRevLett.100.191101 | null | gr-qc astro-ph physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the influence of magnetic fields upon the dynamics of and
resulting gravitational waves from a binary neutron star merger in full general
relativity coupled to ideal magnetohydrodynamics (MHD). We consider two merger
scenarios, one where the stars begin with initially aligned poloidal magnetic
fields a... | [
{
"created": "Mon, 28 Jan 2008 22:14:51 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jun 2008 23:24:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Anderson",
"Matthew",
""
],
[
"Hirschmann",
"Eric W.",
""
],
[
"Lehner",
"Luis",
""
],
[
"Liebling",
"Steven L.",
""
],
[
"Motl",
"Patrick M.",
""
],
[
"Neilsen",
"David",
""
],
[
"Palenzuela",
"Carlos",
"... | We investigate the influence of magnetic fields upon the dynamics of and resulting gravitational waves from a binary neutron star merger in full general relativity coupled to ideal magnetohydrodynamics (MHD). We consider two merger scenarios, one where the stars begin with initially aligned poloidal magnetic fields and... |
gr-qc/0503078 | Alejandro Corichi | Alejandro Corichi and Daniel Sudarsky | Towards a new approach to quantum gravity phenomenology | 13 pages, no figures. Discussion added, same conclusions | Int.J.Mod.Phys.D14:1685-1698,2005 | 10.1142/S0218271805007541 | ICN-UNAM-05/01 | gr-qc | null | The idea that quantum gravity manifestations would be associated with a
violation of Lorentz invariance is very strongly bounded and faces serious
theoretical challenges. This leads us to consider an alternative line of
thought for such phenomenological search. We discuss the underlying viewpoint
and briefly mention ... | [
{
"created": "Thu, 17 Mar 2005 20:33:07 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 2005 19:55:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Corichi",
"Alejandro",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | The idea that quantum gravity manifestations would be associated with a violation of Lorentz invariance is very strongly bounded and faces serious theoretical challenges. This leads us to consider an alternative line of thought for such phenomenological search. We discuss the underlying viewpoint and briefly mention it... |
1202.6676 | Javier E. Cuch\'i MSc | Javier E. Cuch\'i, Alfred Molina and Eduardo Ruiz | Comparison of metrics obtained with analytic perturbation theory and a
numerical code | 4 pages, 2 figures and 1 table. To appear in the proceedings of the
2011 Spanish Relativity Meeting ERE2011 | null | 10.1063/1.4734437 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare metrics obtained through analytic perturbation theory with their
numerical counterparts. The analytic solutions are computed with the CMMR
post-Minkowskian and slow rotation approximation due to Cabezas et al. (2007)
for an asymptotically flat stationary spacetime containing a rotating perfect
fluid compac... | [
{
"created": "Wed, 29 Feb 2012 20:36:37 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Cuchí",
"Javier E.",
""
],
[
"Molina",
"Alfred",
""
],
[
"Ruiz",
"Eduardo",
""
]
] | We compare metrics obtained through analytic perturbation theory with their numerical counterparts. The analytic solutions are computed with the CMMR post-Minkowskian and slow rotation approximation due to Cabezas et al. (2007) for an asymptotically flat stationary spacetime containing a rotating perfect fluid compact ... |
gr-qc/0507124 | Filimonova Irina V | V.O.Soloviev | Black Hole Statistical Physics: Entropy | Plenary talk presented at Workshop on High Energy Physics&Field
Theory (Protvino, Russia, 2004) | null | null | HEPFT/2004/5 | gr-qc | null | We discuss the most interesting approaches to derivation of the
Bekenstein-Hawking entropy formula from a statistical theory.
| [
{
"created": "Fri, 29 Jul 2005 06:46:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soloviev",
"V. O.",
""
]
] | We discuss the most interesting approaches to derivation of the Bekenstein-Hawking entropy formula from a statistical theory. |
0905.3695 | Marco Valerio Battisti | Marco Valerio Battisti, Riccardo Belvedere, Giovanni Montani | Semiclassical suppression of weak anisotropies of a generic Universe | 6 pages, to appear in Europhys.Lett | Europhys.Lett.86:69001,2009 | 10.1209/0295-5075/86/69001 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | A semiclassical mechanism which suppresses the weak anisotropies of an
inhomogeneous cosmological model is developed. In particular, a wave function
of this Universe having a meaningful probabilistic interpretation is obtained
that is in agreement with the Copenhagen School. It describes the evolution of
the anisotro... | [
{
"created": "Fri, 22 May 2009 14:47:40 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 2009 13:37:17 GMT",
"version": "v2"
}
] | 2009-08-03 | [
[
"Battisti",
"Marco Valerio",
""
],
[
"Belvedere",
"Riccardo",
""
],
[
"Montani",
"Giovanni",
""
]
] | A semiclassical mechanism which suppresses the weak anisotropies of an inhomogeneous cosmological model is developed. In particular, a wave function of this Universe having a meaningful probabilistic interpretation is obtained that is in agreement with the Copenhagen School. It describes the evolution of the anisotropi... |
0810.2198 | Yousef Sobouti | Yousef Sobouti | Dark companion of baryonic matter | 4 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whenever and wherever one talks of dark matter, one does so when and where
there is a luminous matter and a dynamical issue to be settled. We promote this
observation to the status of an axiom and assume that there is a dark companion
to every luminous matter and there are orders to this companionship. To pursue
the ... | [
{
"created": "Mon, 13 Oct 2008 10:12:03 GMT",
"version": "v1"
}
] | 2008-10-14 | [
[
"Sobouti",
"Yousef",
""
]
] | Whenever and wherever one talks of dark matter, one does so when and where there is a luminous matter and a dynamical issue to be settled. We promote this observation to the status of an axiom and assume that there is a dark companion to every luminous matter and there are orders to this companionship. To pursue the pr... |
1409.5333 | Maximilian Thaller | H{\aa}kan Andr\'easson, David Fajman, Maximilian Thaller | Static solutions to the Einstein-Vlasov system with non-vanishing
cosmological constant | 31 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct spherically symmetric, static solutions to the Einstein-Vlasov
system with non-vanishing cosmological constant $\Lambda$. The results are
divided as follows. For small $\Lambda>0$ we show existence of globally regular
solutions which coincide with the Schwarzschild-deSitter solution in the
exterior of th... | [
{
"created": "Thu, 18 Sep 2014 15:12:59 GMT",
"version": "v1"
}
] | 2014-09-19 | [
[
"Andréasson",
"Håkan",
""
],
[
"Fajman",
"David",
""
],
[
"Thaller",
"Maximilian",
""
]
] | We construct spherically symmetric, static solutions to the Einstein-Vlasov system with non-vanishing cosmological constant $\Lambda$. The results are divided as follows. For small $\Lambda>0$ we show existence of globally regular solutions which coincide with the Schwarzschild-deSitter solution in the exterior of the ... |
2202.04919 | Hans Ringstr\"om | Hans Ringstr\"om | Initial data on big bang singularities | 54 pages, 1 figure. Second version: minor improvements, updated
references | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The goal of this article is to parametrise solutions to Einstein's equations
with big bang singularities and quiescent asymptotics. To this end, we
introduce a notion of initial data on big bang singularities and conjecture
that it can be used to parametrise quiescent solutions. A mathematical
statement of the conjec... | [
{
"created": "Thu, 10 Feb 2022 09:19:38 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2022 07:21:36 GMT",
"version": "v2"
}
] | 2022-06-22 | [
[
"Ringström",
"Hans",
""
]
] | The goal of this article is to parametrise solutions to Einstein's equations with big bang singularities and quiescent asymptotics. To this end, we introduce a notion of initial data on big bang singularities and conjecture that it can be used to parametrise quiescent solutions. A mathematical statement of the conjectu... |
1006.2210 | Jibitesh Dutta | Jibitesh Dutta and Subenoy Chakraborty | Generalised second law of thermodynamics for interacting dark energy in
the DGP brane world | null | Int.J.Theor.Phys. 50 (2011) 2383-2390 | 10.1007/s10773-011-0721-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the validity of the generalized second law of
thermodynamics (GSLT) in the DGP brane world when universe is filled with
interacting two fluid system: one in the form of cold dark matter and other is
holographic dark energy. The boundary of the universe is assumed to be enclosed
by the dy... | [
{
"created": "Fri, 11 Jun 2010 06:50:09 GMT",
"version": "v1"
}
] | 2015-05-11 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this paper, we investigate the validity of the generalized second law of thermodynamics (GSLT) in the DGP brane world when universe is filled with interacting two fluid system: one in the form of cold dark matter and other is holographic dark energy. The boundary of the universe is assumed to be enclosed by the dyna... |
gr-qc/9302037 | null | M.Ferraris, M.Francaviglia and I.Volovich | A Model of Topological Affine Gravity in Two Dimensions | 11 pages, TO-JLL-P2/92 | Int.J.Mod.Phys. A12 (1997) 5067-5080 | 10.1142/S0217751X9700270X | null | gr-qc hep-th | null | A model of two--dimensional gravity with an action depending only on a linear
connection is considered. This model is a topological one, in the sense that
the classical action does not contain a metric or zweibein at all. A metric and
an additional vector field are instead introduced in the process of solving
equatio... | [
{
"created": "Fri, 26 Feb 1993 21:43:00 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Ferraris",
"M.",
""
],
[
"Francaviglia",
"M.",
""
],
[
"Volovich",
"I.",
""
]
] | A model of two--dimensional gravity with an action depending only on a linear connection is considered. This model is a topological one, in the sense that the classical action does not contain a metric or zweibein at all. A metric and an additional vector field are instead introduced in the process of solving equations... |
gr-qc/0702109 | Adellane Sousa | A. A. Sousa, J. S. Moura and R. B. Pereira | Energy in an Expanding Universe in the Teleparallel Geometry | 19 pages, no figures. Revised in view of Referee's comments. Version
to appear in the Brazilian Journal of Physics | Braz.J.Phys.40:1,2010 | 10.1590/S0103-97332010000100001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main purpose of this paper is to explicitly verify the consistency of the
energy-momentum and angular momentum tensor of the gravitational field
established in the Hamiltonian structure of the Teleparallel Equivalent of
General Relativity (TEGR). In order to reach these objectives, we obtained the
total energy an... | [
{
"created": "Tue, 20 Feb 2007 14:28:01 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Mar 2008 23:11:41 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Dec 2009 18:47:51 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Sousa",
"A. A.",
""
],
[
"Moura",
"J. S.",
""
],
[
"Pereira",
"R. B.",
""
]
] | The main purpose of this paper is to explicitly verify the consistency of the energy-momentum and angular momentum tensor of the gravitational field established in the Hamiltonian structure of the Teleparallel Equivalent of General Relativity (TEGR). In order to reach these objectives, we obtained the total energy and ... |
2003.13127 | Elena P. Savelova Dr. | A.A. Kirillov, E.P. Savelova, and O.M. Lecian | Scattering of GWs on wormholes: foreshadow and afterglow/echoes from
binary merges | revised version, 15 pages, 3 fig | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study specific features of the scattering of gravitational waves on
wormholes and normal matter objects. We derive and solve the GW energy
transport equation and show that the scattered signal lies in the same
frequency spectrum bands as the basic signal. The scattering forms specific
long living tails which alway... | [
{
"created": "Sun, 29 Mar 2020 20:12:36 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Sep 2020 09:04:32 GMT",
"version": "v2"
}
] | 2020-09-29 | [
[
"Kirillov",
"A. A.",
""
],
[
"Savelova",
"E. P.",
""
],
[
"Lecian",
"O. M.",
""
]
] | We study specific features of the scattering of gravitational waves on wormholes and normal matter objects. We derive and solve the GW energy transport equation and show that the scattered signal lies in the same frequency spectrum bands as the basic signal. The scattering forms specific long living tails which always ... |
2111.12576 | Stephen Adler | Stephen L. Adler | Is "Dark Energy" a Quantum Vacuum Energy? | 26 pages; invited mini-review for Modern Physics Letters A, to be
submitted 12/15. In v2, references added in footnote on p3. Comments welcome | Modern Phys. Letters A 36, 2130027 (2021) | 10.1142/S0217732321300275 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the origins, motivations, and implications for cosmology and black
holes, of our proposal that "dark energy" is not a quantum vacuum energy, but
rather arises from a Weyl scaling invariant nonderivative component of the
gravitational action.
| [
{
"created": "Wed, 24 Nov 2021 15:57:49 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Dec 2021 21:16:18 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Adler",
"Stephen L.",
""
]
] | We review the origins, motivations, and implications for cosmology and black holes, of our proposal that "dark energy" is not a quantum vacuum energy, but rather arises from a Weyl scaling invariant nonderivative component of the gravitational action. |
2110.07620 | Rodrigo Vicente | Rodrigo Vicente | The Gravity of Classical Fields: And Its Effect on the Dynamics of
Gravitational Systems | PhD thesis in Physics. arXiv admin note: text overlap with
arXiv:2009.00012 | null | null | null | gr-qc astro-ph.GA astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | Classical fields are ubiquitous in theoretical physics. They find
applications in almost all areas of physics, from condensed matter and particle
physics to cosmology and astrophysics. Scalar fields, in particular, can give
rise to confined structures, such as boson stars, oscillatons or Q-balls. These
objects are in... | [
{
"created": "Thu, 14 Oct 2021 18:00:04 GMT",
"version": "v1"
}
] | 2021-10-18 | [
[
"Vicente",
"Rodrigo",
""
]
] | Classical fields are ubiquitous in theoretical physics. They find applications in almost all areas of physics, from condensed matter and particle physics to cosmology and astrophysics. Scalar fields, in particular, can give rise to confined structures, such as boson stars, oscillatons or Q-balls. These objects are inte... |
gr-qc/0312122 | Sergio M. C. V. Goncalves | Sergio M. C. V. Goncalves | No-horizon theorem for spacetimes with spacelike G1 isometry groups | 8 pages, LaTeX, uses IOP package; published in Class. Quantum Grav | Class.Quant.Grav. 20 (2003) 5399-5405 | 10.1088/0264-9381/20/24/012 | null | gr-qc | null | We consider four-dimensional spacetimes $(M,{\mathbf g})$ which obey the
Einstein equations ${\mathbf G}={\mathbf T}$, and admit a global spacelike
$G_{1}={\mathbb R}$ isometry group. By means of dimensional reduction and local
analyis on the reduced (2+1) spacetime, we obtain a sufficient condition on
${\mathbf T}$ ... | [
{
"created": "Tue, 30 Dec 2003 19:51:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Goncalves",
"Sergio M. C. V.",
""
]
] | We consider four-dimensional spacetimes $(M,{\mathbf g})$ which obey the Einstein equations ${\mathbf G}={\mathbf T}$, and admit a global spacelike $G_{1}={\mathbb R}$ isometry group. By means of dimensional reduction and local analyis on the reduced (2+1) spacetime, we obtain a sufficient condition on ${\mathbf T}$ wh... |
2012.12037 | Geraint F. Lewis Prof | Geraint F. Lewis and Luke A. Barnes | The One-Way Speed of Light and the Milne Universe | 7 pages, 5 figures, to appear in PASA | Publ. Astron. Soc. Aust. 38 (2021) e007 | 10.1017/pasa.2021.2 | GFL-001 | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In Einstein's Special Theory of Relativity, all observers measure the speed
of light, $c$, to be the same. However, this refers to the round trip speed,
where a clock at the origin times the outward and return trip of light
reflecting off a distant mirror. Measuring the one-way speed of light is
fraught with issues o... | [
{
"created": "Fri, 18 Dec 2020 02:34:20 GMT",
"version": "v1"
}
] | 2021-02-17 | [
[
"Lewis",
"Geraint F.",
""
],
[
"Barnes",
"Luke A.",
""
]
] | In Einstein's Special Theory of Relativity, all observers measure the speed of light, $c$, to be the same. However, this refers to the round trip speed, where a clock at the origin times the outward and return trip of light reflecting off a distant mirror. Measuring the one-way speed of light is fraught with issues of ... |
2107.12546 | Genly Le\'on | Andronikos Paliathanasis (DUT, Durban and Chile Austral U., Valdivia),
Genly Leon (Catolica del Norte U.) | Einstein-{\ae}ther Scalar-tensor Cosmology | 22 pages, 1 compound figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an Einstein-{\ae}ther scalar-tensor cosmological model. In
particular in the scalar-tensor Action Integral we introduce the {\ae}ther
field with {\ae}ther coefficients to be functions of the scalar field. This
cosmological model extends previous studies on Lorentz-violating theories. For
a spatially flat F... | [
{
"created": "Tue, 27 Jul 2021 01:41:27 GMT",
"version": "v1"
}
] | 2021-07-28 | [
[
"Paliathanasis",
"Andronikos",
"",
"DUT, Durban and Chile Austral U., Valdivia"
],
[
"Leon",
"Genly",
"",
"Catolica del Norte U."
]
] | We propose an Einstein-{\ae}ther scalar-tensor cosmological model. In particular in the scalar-tensor Action Integral we introduce the {\ae}ther field with {\ae}ther coefficients to be functions of the scalar field. This cosmological model extends previous studies on Lorentz-violating theories. For a spatially flat Fri... |
0803.1401 | Thomas Buchert | Thomas Buchert, Mauro Carfora | On the curvature of the present-day Universe | 43 pages, 19 figures included, matches published version in C.Q.G. | Class.Quant.Grav.25:195001,2008 | 10.1088/0264-9381/25/19/195001 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the effect of curvature and matter inhomogeneities on the averaged
scalar curvature of the present-day Universe. Motivated by studies of averaged
inhomogeneous cosmologies, we contemplate on the question whether it is
sensible to assume that curvature averages out on some scale of homogeneity, as
implied b... | [
{
"created": "Mon, 10 Mar 2008 12:51:41 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jul 2008 18:42:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Buchert",
"Thomas",
""
],
[
"Carfora",
"Mauro",
""
]
] | We discuss the effect of curvature and matter inhomogeneities on the averaged scalar curvature of the present-day Universe. Motivated by studies of averaged inhomogeneous cosmologies, we contemplate on the question whether it is sensible to assume that curvature averages out on some scale of homogeneity, as implied by ... |
1706.08842 | Etienne Baffou | E. H. Baffou, M. J. S. Houndjo, M. Hamani-Daouda and F. G. Alvarenga | Late time cosmological approach in mimetic $f(R,T)$ gravity | 18 pages, 2 figures | null | 10.1140/epjc/s10052-017-5291-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the late-time cosmic acceleration in mimetic
$f(R,T)$ gravity with Lagrange multiplier and potential in a Universe
containing, besides radiation and dark energy, a self-interacting (collisional)
matter. We obtain through the modified Friedmann equations, the main equation
that can descri... | [
{
"created": "Sat, 24 Jun 2017 10:50:05 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Baffou",
"E. H.",
""
],
[
"Houndjo",
"M. J. S.",
""
],
[
"Hamani-Daouda",
"M.",
""
],
[
"Alvarenga",
"F. G.",
""
]
] | In this paper, we investigate the late-time cosmic acceleration in mimetic $f(R,T)$ gravity with Lagrange multiplier and potential in a Universe containing, besides radiation and dark energy, a self-interacting (collisional) matter. We obtain through the modified Friedmann equations, the main equation that can describe... |
1604.01258 | Herman Telkamp | Herman Telkamp | Machian derivation of the Friedmann equation | 5 pages, 1 fig | Phys. Rev. D 94, 043520 (2016) | 10.1103/PhysRevD.94.043520 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite all fundamental objections against Newtonian concepts in cosmology,
the Friedmann equation derives from these in an astoundingly simple way through
application of the shell theorem and conservation of Newtonian energy in an
infinite universe. However, Friedmann universes in general posses a finite
gravitation... | [
{
"created": "Fri, 1 Apr 2016 16:47:37 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2016 11:53:30 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Telkamp",
"Herman",
""
]
] | Despite all fundamental objections against Newtonian concepts in cosmology, the Friedmann equation derives from these in an astoundingly simple way through application of the shell theorem and conservation of Newtonian energy in an infinite universe. However, Friedmann universes in general posses a finite gravitational... |
gr-qc/0605025 | Michael Wernig-Pichler | Michael Wernig-Pichler | Relativistic elastodynamics | PHD-thesis, 140 pages, 2 figures | null | null | null | gr-qc | null | There are many different formulations of relativistic elasticity. Most of
them are only concerned with formal questions rather than questions regarding
the PDE point of view. The aim of this thesis is to obtain various local
existence results for dynamical scenarios involving elastic matter. Following
Beig and Schmid... | [
{
"created": "Thu, 4 May 2006 10:07:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wernig-Pichler",
"Michael",
""
]
] | There are many different formulations of relativistic elasticity. Most of them are only concerned with formal questions rather than questions regarding the PDE point of view. The aim of this thesis is to obtain various local existence results for dynamical scenarios involving elastic matter. Following Beig and Schmidt ... |
2005.03044 | Christopher Munna | Christopher Munna, Charles R. Evans, Seth Hopper, Erik Forseth | Determination of new coefficients in the angular momentum and energy
fluxes at infinity to 9PN for eccentric Schwarzschild extreme-mass-ratio
inspirals using mode-by-mode fitting | 36 pages, 1 figure | Phys. Rev. D 102, 024047 (2020) | 10.1103/PhysRevD.102.024047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an extension of work in an earlier paper showing high precision
comparisons between black hole perturbation theory and post-Newtonian (PN)
theory in their region of overlapping validity for bound, eccentric-orbit,
Schwarzschild extreme-mass-ratio inspirals. As before we apply a numerical
fitting scheme to ... | [
{
"created": "Wed, 6 May 2020 18:00:13 GMT",
"version": "v1"
}
] | 2020-07-22 | [
[
"Munna",
"Christopher",
""
],
[
"Evans",
"Charles R.",
""
],
[
"Hopper",
"Seth",
""
],
[
"Forseth",
"Erik",
""
]
] | We present an extension of work in an earlier paper showing high precision comparisons between black hole perturbation theory and post-Newtonian (PN) theory in their region of overlapping validity for bound, eccentric-orbit, Schwarzschild extreme-mass-ratio inspirals. As before we apply a numerical fitting scheme to ex... |
gr-qc/9704011 | Steven G. Harris | Steven G. Harris | Universality of the Future Chronological Boundary | 25 pages, AMS-TeX; 2 figures, PostScript (separate); captions
(separate); submitted to Class. Quantum Grav, slight revision: bottom lines
legible, figures added, expanded discussion and examples | null | 10.1063/1.532582 | null | gr-qc | null | The purpose of this note is to establish, in a categorical manner, the
universality of the Geroch-Kronheimer-Penrose causal boundary when considering
the types of causal structures that may profitably be put on any sort of
boundary for a spacetime. Actually, this can only be done for the future causal
boundary (or th... | [
{
"created": "Fri, 4 Apr 1997 21:28:02 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Sep 1997 23:41:29 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Harris",
"Steven G.",
""
]
] | The purpose of this note is to establish, in a categorical manner, the universality of the Geroch-Kronheimer-Penrose causal boundary when considering the types of causal structures that may profitably be put on any sort of boundary for a spacetime. Actually, this can only be done for the future causal boundary (or the ... |
gr-qc/0411017 | Hideaki Kudoh | Hideaki Kudoh, Atsushi Taruya | Probing anisotropies of gravitational-wave backgrounds with a
space-based interferometer: geometric properties of antenna patterns and
their angular power | RevTex4, 22 pages, 6 figures (low resolution), typos corrected | Phys.Rev. D71 (2005) 024025 | 10.1103/PhysRevD.71.024025 | UTAP-504, RESCEU-35/04 | gr-qc astro-ph | null | We discuss the sensitivity to anisotropies of stochastic gravitational-wave
backgrounds (GWBs) observed via space-based interferometer. In addition to the
unresolved galactic binaries as the most promising GWB source of the planned
Laser Interferometer Space Antenna (LISA), the extragalactic sources for GWBs
might be... | [
{
"created": "Wed, 3 Nov 2004 10:54:23 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2005 15:23:43 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kudoh",
"Hideaki",
""
],
[
"Taruya",
"Atsushi",
""
]
] | We discuss the sensitivity to anisotropies of stochastic gravitational-wave backgrounds (GWBs) observed via space-based interferometer. In addition to the unresolved galactic binaries as the most promising GWB source of the planned Laser Interferometer Space Antenna (LISA), the extragalactic sources for GWBs might be d... |
gr-qc/0603045 | Heinrich P\"as | Heinrich P\"as, Sandip Pakvasa, James Dent, Thomas J. Weiler | Closed timelike curves in asymmetrically warped brane universes | 24 pages, 2 figures; major corrections: CTC metric generalized from
5D to 6D, the new 6D metric satisfies the conclusions attributed
(incorrectly) to the 5D metric in v1 | Phys.Rev.D80:044008,2009 | 10.1103/PhysRevD.80.044008 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In asymmetrically warped spacetimes different warp factors are assigned to
space and to time. We discuss causality properties of these warped brane
universes and argue that scenarios with two extra dimensions may allow for
timelike curves which can be closed via paths in the extra-dimensional bulk. In
particular, nec... | [
{
"created": "Mon, 13 Mar 2006 02:36:01 GMT",
"version": "v1"
},
{
"created": "Mon, 18 May 2009 14:20:50 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Päs",
"Heinrich",
""
],
[
"Pakvasa",
"Sandip",
""
],
[
"Dent",
"James",
""
],
[
"Weiler",
"Thomas J.",
""
]
] | In asymmetrically warped spacetimes different warp factors are assigned to space and to time. We discuss causality properties of these warped brane universes and argue that scenarios with two extra dimensions may allow for timelike curves which can be closed via paths in the extra-dimensional bulk. In particular, neces... |
2403.16532 | Leo C.Y. Ng | Leo C. Y. Ng, Justin Janquart, Hemantakumar Phurailatpam, Harsh
Narola, Jason S. C. Poon, Chris Van Den Broeck, Otto A. Hannuksela | Uncovering faint lensed gravitational-wave signals and reprioritizing
their follow-up analysis using galaxy lensing forecasts with detected
counterparts | 15 pages, 28 figures, 1 table | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Like light, gravitational waves can be gravitationally lensed by massive
astrophysical objects. For galaxy and galaxy-cluster lenses, one expects to see
strong lensing -- forecasted to become observable in the coming years -- where
the original wave is split into multiple copies with the same frequency
evolution but ... | [
{
"created": "Mon, 25 Mar 2024 08:19:07 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2024 08:32:20 GMT",
"version": "v2"
}
] | 2024-04-08 | [
[
"Ng",
"Leo C. Y.",
""
],
[
"Janquart",
"Justin",
""
],
[
"Phurailatpam",
"Hemantakumar",
""
],
[
"Narola",
"Harsh",
""
],
[
"Poon",
"Jason S. C.",
""
],
[
"Broeck",
"Chris Van Den",
""
],
[
"Hannuksela",
"Otto ... | Like light, gravitational waves can be gravitationally lensed by massive astrophysical objects. For galaxy and galaxy-cluster lenses, one expects to see strong lensing -- forecasted to become observable in the coming years -- where the original wave is split into multiple copies with the same frequency evolution but di... |
1909.10890 | Kevin Ludwick | Kevin J. Ludwick, Holston Sebaugh | Deriving the Dark Matter-Dark Energy Interaction Term in the Continuity
Equation from the Boltzmann Equation | 10+3 pages, 1 figure; accepted to Modern Physics Letters A | Modern Physics Letters A, Vol. 36, No. 18, 2150122 (2021) | 10.1142/S0217-7323(21)50122-4 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Dark energy and dark matter are two of the biggest mysteries of modern
cosmology, and our understanding of their fundamental nature is incomplete.
Many parameterizations of couplings between the two in the continuity equation
have been studied in the literature, and observational data from the growth of
perturbations... | [
{
"created": "Sat, 21 Sep 2019 17:07:52 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Mar 2021 14:38:49 GMT",
"version": "v2"
}
] | 2021-06-25 | [
[
"Ludwick",
"Kevin J.",
""
],
[
"Sebaugh",
"Holston",
""
]
] | Dark energy and dark matter are two of the biggest mysteries of modern cosmology, and our understanding of their fundamental nature is incomplete. Many parameterizations of couplings between the two in the continuity equation have been studied in the literature, and observational data from the growth of perturbations c... |
1810.03059 | H\'ector Hern\'andez | J. Ospino, J.L. Hern\'andez-Pastora, H. Hern\'andez and L.A. N\'u\~nez | Are there any models with homogeneous energy density? | 17 pages | null | 10.1007/s10714-018-2467-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By applying a recent method --based on a tetrad formalism in General
Relativity and the orthogonal splitting of the Riemann tensor-- to the simple
spherical static case, we found that the only static solution with homogeneous
energy density is the Schwarzschild solution and that there are no spherically
symmetric dyn... | [
{
"created": "Sat, 6 Oct 2018 22:17:15 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2018 15:32:16 GMT",
"version": "v2"
}
] | 2018-10-24 | [
[
"Ospino",
"J.",
""
],
[
"Hernández-Pastora",
"J. L.",
""
],
[
"Hernández",
"H.",
""
],
[
"Núñez",
"L. A.",
""
]
] | By applying a recent method --based on a tetrad formalism in General Relativity and the orthogonal splitting of the Riemann tensor-- to the simple spherical static case, we found that the only static solution with homogeneous energy density is the Schwarzschild solution and that there are no spherically symmetric dynam... |
1601.07477 | Martin Bojowald | M. M. Amaral and Martin Bojowald | A path-integral approach to the problem of time | 19 pages, v2: additional remarks on topological turning points | Annals of Physics 388C (2018) 241-266 | 10.1016/j.aop.2017.11.027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum transition amplitudes are formulated for a model system with local
internal time, using path integrals. The amplitudes are shown to be more
regular near a turning point of internal time than could be expected based on
existing canonical treatments. In particular, a successful transition through a
turning poin... | [
{
"created": "Wed, 27 Jan 2016 18:10:34 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Feb 2016 15:39:00 GMT",
"version": "v2"
}
] | 2017-12-19 | [
[
"Amaral",
"M. M.",
""
],
[
"Bojowald",
"Martin",
""
]
] | Quantum transition amplitudes are formulated for a model system with local internal time, using path integrals. The amplitudes are shown to be more regular near a turning point of internal time than could be expected based on existing canonical treatments. In particular, a successful transition through a turning point ... |
gr-qc/0501088 | Carlos O. Lousto | Carlos O. Lousto | Reconstruction of Black Hole Metric Perturbations from Weyl Curvature
II: The Regge-Wheeler gauge | 22 pages, no figures | Class.Quant.Grav. 22 (2005) S569-S588 | 10.1088/0264-9381/22/15/002 | null | gr-qc | null | Perturbation theory of rotating black holes is described in terms of the Weyl
scalars $\psi_4$ and $\psi_0$; each satisfying the Teukolsky's complex master
wave equation with spin $s=\mp2$, and respectively representing outgoing and
ingoing radiation. We explicitly construct the metric perturbations out of
these Weyl... | [
{
"created": "Thu, 27 Jan 2005 20:20:44 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2005 19:36:06 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Lousto",
"Carlos O.",
""
]
] | Perturbation theory of rotating black holes is described in terms of the Weyl scalars $\psi_4$ and $\psi_0$; each satisfying the Teukolsky's complex master wave equation with spin $s=\mp2$, and respectively representing outgoing and ingoing radiation. We explicitly construct the metric perturbations out of these Weyl s... |
2112.12293 | Jiri Podolsky | David Matejov, Jiri Podolsky | Extremal isolated horizons with $\Lambda$ and the related unique type D
black holes | 28 pages, 1 figure | Phys. Rev. D 105, 064016 (2022) | 10.1103/PhysRevD.105.064016 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We extend our previous work in which we derived the most general form of an
induced metric describing the geometry of an axially symmetric extremal
isolated horizon (EIH) in asymptotically flat spacetime. Here we generalize it
to EIHs in asymptotically (anti-)de Sitter spacetime. The resulting metric
conveniently for... | [
{
"created": "Thu, 23 Dec 2021 00:59:20 GMT",
"version": "v1"
}
] | 2022-08-23 | [
[
"Matejov",
"David",
""
],
[
"Podolsky",
"Jiri",
""
]
] | We extend our previous work in which we derived the most general form of an induced metric describing the geometry of an axially symmetric extremal isolated horizon (EIH) in asymptotically flat spacetime. Here we generalize it to EIHs in asymptotically (anti-)de Sitter spacetime. The resulting metric conveniently forms... |
2010.14526 | Merced Montesinos | Mariano Celada, Ricardo Escobedo, Merced Montesinos | Canonical analysis of $BF$ gravity in $n$ dimensions | null | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we perform in a manifestly $SO(n-1,1)$ [or, alternatively
$SO(n)$] covariant fashion, the canonical analysis of general relativity in $n$
dimensions written as a constrained $BF$ theory. Since the Lagrangian action of
the theory can be written in two classically equivalent ways, we analyze each
case sep... | [
{
"created": "Tue, 27 Oct 2020 18:00:43 GMT",
"version": "v1"
}
] | 2020-10-29 | [
[
"Celada",
"Mariano",
""
],
[
"Escobedo",
"Ricardo",
""
],
[
"Montesinos",
"Merced",
""
]
] | In this paper we perform in a manifestly $SO(n-1,1)$ [or, alternatively $SO(n)$] covariant fashion, the canonical analysis of general relativity in $n$ dimensions written as a constrained $BF$ theory. Since the Lagrangian action of the theory can be written in two classically equivalent ways, we analyze each case separ... |
2203.09209 | Flavio Bombacigno | Flavio Bombacigno | Quasinormal modes of Schwarzschild black holes in metric affine
Chern-Simons theory | Contribution to the 2022 Gravitation session of the 56th Rencontres
de Moriond | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We reformulate the Chern-Simons modified gravity in the metric-affine
formalism, by enlarging the Pontryagin density with homothetic curvature terms
which restore projective invariance without spoiling topologicity. The latter
is then violated by promoting the coupling of the Chern-Simons term to a
(pseudo)-scalar fi... | [
{
"created": "Thu, 17 Mar 2022 10:00:29 GMT",
"version": "v1"
}
] | 2022-03-18 | [
[
"Bombacigno",
"Flavio",
""
]
] | We reformulate the Chern-Simons modified gravity in the metric-affine formalism, by enlarging the Pontryagin density with homothetic curvature terms which restore projective invariance without spoiling topologicity. The latter is then violated by promoting the coupling of the Chern-Simons term to a (pseudo)-scalar fiel... |
1706.04441 | Dao-Jun Liu | Yang Huang, Dao-Jun Liu, Xiang-Hua Zhai and Xin-Zhou Li | Scalar clouds around Kerr-Sen black holes | 15 pages, 7 figures, accepted for publication in Class. Quantum Grav | null | 10.1088/1361-6382/aa7964 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the behaviour of a charged massive scalar test field in the
background of a Kerr-Sen black hole is investigated. A kind of stationary
solutions, dubbed scalar clouds, are obtained numerically and expressed by the
existence lines in the parameter space. We show that for fixed background and a
given set ... | [
{
"created": "Wed, 14 Jun 2017 12:31:29 GMT",
"version": "v1"
}
] | 2017-07-26 | [
[
"Huang",
"Yang",
""
],
[
"Liu",
"Dao-Jun",
""
],
[
"Zhai",
"Xiang-Hua",
""
],
[
"Li",
"Xin-Zhou",
""
]
] | In this paper, the behaviour of a charged massive scalar test field in the background of a Kerr-Sen black hole is investigated. A kind of stationary solutions, dubbed scalar clouds, are obtained numerically and expressed by the existence lines in the parameter space. We show that for fixed background and a given set of... |
gr-qc/0404074 | Stefan Hollands | Stefan Hollands and Robert M. Wald | Conservation of the stress tensor in perturbative interacting quantum
field theory in curved spacetimes | 88 pages, latex, no figures, v2: changes in the proof of proposition
3.1 | Rev.Math.Phys. 17 (2005) 227-312 | 10.1142/S0129055X05002340 | null | gr-qc hep-th math-ph math.MP | null | We propose additional conditions (beyond those considered in our previous
papers) that should be imposed on Wick products and time-ordered products of a
free quantum scalar field in curved spacetime. These conditions arise from a
simple ``Principle of Perturbative Agreement'': For interaction Lagrangians
$L_1$ that a... | [
{
"created": "Fri, 16 Apr 2004 18:40:09 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jan 2005 13:22:08 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Hollands",
"Stefan",
""
],
[
"Wald",
"Robert M.",
""
]
] | We propose additional conditions (beyond those considered in our previous papers) that should be imposed on Wick products and time-ordered products of a free quantum scalar field in curved spacetime. These conditions arise from a simple ``Principle of Perturbative Agreement'': For interaction Lagrangians $L_1$ that are... |
gr-qc/9411068 | Ysfujii | Yasunori Fujii | Induced Violation of Weak Equivalence Principle in the Brans-Dicke
Theory | 7 pages, LaTex | Mod.Phys.Lett. A9 (1994) 3685-3690 | 10.1142/S021773239400352X | null | gr-qc | null | A quantum correction to the Brans-Dicke theory due to interactions among
matter fields is calculated, resulting in violation of WEP, hence giving a
constraint on the parameter $\omega$ far more stringent than accepted so far.
The tentative estimate gives the lower bounds $\gsim 10^{6}$ and $\gsim 10^{8}$
for the assu... | [
{
"created": "Tue, 29 Nov 1994 04:16:13 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Fujii",
"Yasunori",
""
]
] | A quantum correction to the Brans-Dicke theory due to interactions among matter fields is calculated, resulting in violation of WEP, hence giving a constraint on the parameter $\omega$ far more stringent than accepted so far. The tentative estimate gives the lower bounds $\gsim 10^{6}$ and $\gsim 10^{8}$ for the assume... |
0912.4054 | Eugenio Bianchi | Eugenio Bianchi, Elena Magliaro, Claudio Perini | Coherent spin-networks | 15 pages | Phys.Rev.D82:024012,2010 | 10.1103/PhysRevD.82.024012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we discuss a proposal of coherent states for Loop Quantum
Gravity. These states are labeled by a point in the phase space of General
Relativity as captured by a spin-network graph. They are defined as the gauge
invariant projection of a product over links of Hall's heat-kernels for the
cotangent bundle ... | [
{
"created": "Sun, 20 Dec 2009 21:11:09 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2010 20:34:10 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Feb 2010 22:31:52 GMT",
"version": "v3"
},
{
"created": "Fri, 17 Sep 2010 18:28:26 GMT",
"version": "v4"
}
] | 2010-09-20 | [
[
"Bianchi",
"Eugenio",
""
],
[
"Magliaro",
"Elena",
""
],
[
"Perini",
"Claudio",
""
]
] | In this paper we discuss a proposal of coherent states for Loop Quantum Gravity. These states are labeled by a point in the phase space of General Relativity as captured by a spin-network graph. They are defined as the gauge invariant projection of a product over links of Hall's heat-kernels for the cotangent bundle of... |
1101.2425 | Jose Wadih Maluf Dr. | J. F. da Rocha-Neto, J. W. Maluf and S. C. Ulhoa | Hamiltonian formulation of unimodular gravity in the teleparallel
geometry | 21 pages, no figures | Phys.Rev.D82:124035,2010 | 10.1103/PhysRevD.82.124035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the teleparallel equivalent of general relativity we
establish the Hamiltonian formulation of the unimodular theory of gravity. Here
we do not carry out the usual $3+1$ decomposition of the field quantities in
terms of the lapse and shift functions, as in the ADM formalism. The
corresponding Lagrang... | [
{
"created": "Wed, 12 Jan 2011 19:00:12 GMT",
"version": "v1"
}
] | 2011-01-17 | [
[
"da Rocha-Neto",
"J. F.",
""
],
[
"Maluf",
"J. W.",
""
],
[
"Ulhoa",
"S. C.",
""
]
] | In the context of the teleparallel equivalent of general relativity we establish the Hamiltonian formulation of the unimodular theory of gravity. Here we do not carry out the usual $3+1$ decomposition of the field quantities in terms of the lapse and shift functions, as in the ADM formalism. The corresponding Lagrange ... |
gr-qc/9903033 | Wai-Mo Suen | K.S. Cheng, Y.Li and W.-M. Suen | The Thermal Response of a Pulsar Glitch : The Non-spherical Symmetric
Case | Published in Ap. J. Lett | null | null | null | gr-qc astro-ph | null | We study the thermal evolution of a pulsar after a glitch in which the energy
is released from a relative compact region. A set of relativistic thermal
transport and energy balance equations is used to study the thermal evolution,
without making the assumption of spherical symmetry. We use an exact cooling
model to s... | [
{
"created": "Mon, 8 Mar 1999 23:38:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cheng",
"K. S.",
""
],
[
"Li",
"Y.",
""
],
[
"Suen",
"W. -M.",
""
]
] | We study the thermal evolution of a pulsar after a glitch in which the energy is released from a relative compact region. A set of relativistic thermal transport and energy balance equations is used to study the thermal evolution, without making the assumption of spherical symmetry. We use an exact cooling model to sol... |
gr-qc/9710049 | Jerry Griffiths | J Podolsky and J B Griffiths | Impulsive waves in de Sitter and anti-de Sitter space-times generated by
null particles with an arbitrary multipole structure | 12 pages, LaTeX, one eps figure included using graphicx, To appear in
Classical and Quantum Gravity | Class.Quant.Grav. 15 (1998) 453-463 | 10.1088/0264-9381/15/2/018 | null | gr-qc | null | We describe a class of impulsive gravitational waves which propagate either
in a de Sitter or an anti-de Sitter background. They are conformal to impulsive
waves of Kundt's class. In a background with positive cosmological constant
they are spherical (but non-expanding) waves generated by pairs of particles
with arbi... | [
{
"created": "Wed, 8 Oct 1997 12:50:01 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Podolsky",
"J",
""
],
[
"Griffiths",
"J B",
""
]
] | We describe a class of impulsive gravitational waves which propagate either in a de Sitter or an anti-de Sitter background. They are conformal to impulsive waves of Kundt's class. In a background with positive cosmological constant they are spherical (but non-expanding) waves generated by pairs of particles with arbitr... |
2408.02596 | Volker Schlue | Grigorios Fournodavlos and Volker Schlue | Stability of the expanding region of Kerr de Sitter spacetimes | 45 pages, 3 figures | null | null | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the nonlinear stability of the cosmological region of Kerr de Sitter
spacetimes. More precisely, we show that solutions to the Einstein vacuum
equations with positive cosmological constant arising from data on a cylinder
that is uniformly close to the Kerr de Sitter geometry (with possibly different
mass and... | [
{
"created": "Mon, 5 Aug 2024 16:12:39 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Fournodavlos",
"Grigorios",
""
],
[
"Schlue",
"Volker",
""
]
] | We prove the nonlinear stability of the cosmological region of Kerr de Sitter spacetimes. More precisely, we show that solutions to the Einstein vacuum equations with positive cosmological constant arising from data on a cylinder that is uniformly close to the Kerr de Sitter geometry (with possibly different mass and a... |
gr-qc/0611023 | Davi Giugno | E. Abdalla, D. Giugno | An Extensive Search for Overtones in Schwarzschild Black Holes | 2 figures, revtex4 used | Braz.J.Phys.37:450-456,2007 | 10.1590/S0103-97332007000300018 | null | gr-qc | null | In this paper we show that with standard methods it is possible to obtain
highly precise results for QNMs. In particular, secondary modes are obtained by
numerical integration. We compare several results making a detailed analysis.
| [
{
"created": "Fri, 3 Nov 2006 19:10:14 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Abdalla",
"E.",
""
],
[
"Giugno",
"D.",
""
]
] | In this paper we show that with standard methods it is possible to obtain highly precise results for QNMs. In particular, secondary modes are obtained by numerical integration. We compare several results making a detailed analysis. |
gr-qc/9909026 | Saul A. Teukolsky | Saul A. Teukolsky | On the Stability of the Iterated Crank-Nicholson Method in Numerical
Relativity | 2 pages | Phys.Rev. D61 (2000) 087501 | 10.1103/PhysRevD.61.087501 | null | gr-qc | null | The iterated Crank-Nicholson method has become a popular algorithm in
numerical relativity. We show that one should carry out exactly two iterations
and no more. While the limit of an infinite number of iterations is the
standard Crank-Nicholson method, it can in fact be worse to do more than two
iterations, and it n... | [
{
"created": "Tue, 7 Sep 1999 14:35:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Teukolsky",
"Saul A.",
""
]
] | The iterated Crank-Nicholson method has become a popular algorithm in numerical relativity. We show that one should carry out exactly two iterations and no more. While the limit of an infinite number of iterations is the standard Crank-Nicholson method, it can in fact be worse to do more than two iterations, and it nev... |
2212.06671 | Pierre Teyssandier | P. Teyssandier | Time transfer functions without enhanced terms in stationary spacetime
-- Application to an isolated, axisymmetric spinning body | 17 pages, 1 figure | null | null | null | gr-qc astro-ph.EP | http://creativecommons.org/licenses/by/4.0/ | We develop a new perturbation method for determining a class of time transfer
functions in a stationary spacetime when its metric is a small deformation of a
background metric for which the time transfer functions are known in a closed
form. The perturbation terms are expressed as line integrals along the null
geodes... | [
{
"created": "Tue, 13 Dec 2022 15:48:26 GMT",
"version": "v1"
}
] | 2022-12-14 | [
[
"Teyssandier",
"P.",
""
]
] | We develop a new perturbation method for determining a class of time transfer functions in a stationary spacetime when its metric is a small deformation of a background metric for which the time transfer functions are known in a closed form. The perturbation terms are expressed as line integrals along the null geodesic... |
0912.3875 | Hai Siong Tan | H. S. Tan | A Proof for a Theorem of Wald in Arbitrary Dimensions | Part of author's B.Sc. Honors Thesis (NUS, 2003) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Static, axisymmetric solutions form a large class of important black holes in
classical GR. In four dimensions, the existence of their most general metric
ansatz relies on the fact that two-dimensional subspaces of the tangent space
at each point spanned by vectors orthogonal to the time-translation and
rotation Kill... | [
{
"created": "Sat, 19 Dec 2009 09:12:16 GMT",
"version": "v1"
}
] | 2009-12-22 | [
[
"Tan",
"H. S.",
""
]
] | Static, axisymmetric solutions form a large class of important black holes in classical GR. In four dimensions, the existence of their most general metric ansatz relies on the fact that two-dimensional subspaces of the tangent space at each point spanned by vectors orthogonal to the time-translation and rotation Killin... |
2009.12777 | Salvatore Capozziello | Salvatore Capozziello, Maurizio Capriolo, and Shin'ichi Nojiri | Considerations on gravitational waves in higher-order local and
non-local gravity | 15 pages, to appear in Physics. Lett. B | null | 10.1016/j.physletb.2020.135821 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of gravitational wave modes and polarizations could constitute
an extremely important signature to discriminate among different theories of
gravity. According to this statement, it is possible to prove that higher-order
non-local gravity has formally the same gravitational spectrum of higher-order
local... | [
{
"created": "Sun, 27 Sep 2020 07:42:56 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Capriolo",
"Maurizio",
""
],
[
"Nojiri",
"Shin'ichi",
""
]
] | The detection of gravitational wave modes and polarizations could constitute an extremely important signature to discriminate among different theories of gravity. According to this statement, it is possible to prove that higher-order non-local gravity has formally the same gravitational spectrum of higher-order local g... |
0712.0713 | Luis Herrera | L. Herrera, J. Ospino and A. Di Prisco | All static spherically symmetric anisotropic solutions of Einstein's
equations | 8 pages Latex. To appear in Phys. Rev. D. New reference added. Some
references corrected | Phys.Rev.D77:027502,2008 | 10.1103/PhysRevD.77.027502 | null | gr-qc astro-ph | null | An algorithm recently presented by Lake to obtain all static spherically
symmetric perfect fluid solutions, is extended to the case of locally
anisotropic fluids (principal stresses unequal). As expected, the new formalism
requires the knowledge of two functions (instead of one) to generate all
possible solutions. To... | [
{
"created": "Wed, 5 Dec 2007 13:17:29 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2007 22:11:04 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Jan 2008 14:57:32 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Herrera",
"L.",
""
],
[
"Ospino",
"J.",
""
],
[
"Di Prisco",
"A.",
""
]
] | An algorithm recently presented by Lake to obtain all static spherically symmetric perfect fluid solutions, is extended to the case of locally anisotropic fluids (principal stresses unequal). As expected, the new formalism requires the knowledge of two functions (instead of one) to generate all possible solutions. To i... |
1911.08257 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is Rosa | Cosmological and astrophysical applications of modified theories of
gravity | PhD Thesis | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study cosmological and astrophysical applications of the
recently proposed generalized hybrid metric-Palatini gravity theory, which
combines features of both the metric and the Palatini approaches to the
variational method in $f\left(R\right)$ gravity. This theory arises as a
natural generalization o... | [
{
"created": "Tue, 19 Nov 2019 13:35:46 GMT",
"version": "v1"
}
] | 2019-11-20 | [
[
"Rosa",
"João Luís",
""
]
] | In this work, we study cosmological and astrophysical applications of the recently proposed generalized hybrid metric-Palatini gravity theory, which combines features of both the metric and the Palatini approaches to the variational method in $f\left(R\right)$ gravity. This theory arises as a natural generalization of ... |
gr-qc/0009043 | Michael A. Ivanov | Michael A. Ivanov | Non-dopplerian cosmological redshift parameters in a model of
graviton-dusty universe | 5 pages. It was presented: at SIGRAV'2000 Congress, Italy (this
version); in Proc. of the Int. Symp. "FFP 4" (9-13 Dec 2000, Hyderabad,
India), Sidharth& Altaisky, Eds., Kluwer Academic/Plenum, 2001;in Proc. of
the 4th Edoardo Amaldi Conference on GW (Perth, W. Australia, 8-13 July 2001) | Class.Quant.Grav. 19 (2002) 1351-1354 | 10.1088/0264-9381/19/7/317 | null | gr-qc | null | Possible effects are considered which would be caused by a hypothetical
superstrong interaction of photons or massive bodies with single gravitons of
the graviton background. If full cosmological redshift magnitudes are caused by
the interaction, then the luminosity distance in a flat non-expanding universe
as a func... | [
{
"created": "Wed, 13 Sep 2000 06:31:25 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Dec 2004 12:02:56 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Ivanov",
"Michael A.",
""
]
] | Possible effects are considered which would be caused by a hypothetical superstrong interaction of photons or massive bodies with single gravitons of the graviton background. If full cosmological redshift magnitudes are caused by the interaction, then the luminosity distance in a flat non-expanding universe as a functi... |
gr-qc/0304099 | Brian Edgar | S.Brian Edgar, Ola Wingbrant | Old and new results for superenergy tensors from dimensionally dependent
tensor identities | 18 pages; TeX file | J.Math.Phys. 44 (2003) 6140-6159 | 10.1063/1.1624094 | null | gr-qc | null | It is known that some results for spinors, and in particular for superenergy
spinors, are much less transparent and require a lot more effort to establish,
when considered from the tensor viewpoint. In this paper we demonstrate how the
use of dimensionally dependent tensor identities enables us to derive a number
of ... | [
{
"created": "Mon, 28 Apr 2003 15:23:30 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Edgar",
"S. Brian",
""
],
[
"Wingbrant",
"Ola",
""
]
] | It is known that some results for spinors, and in particular for superenergy spinors, are much less transparent and require a lot more effort to establish, when considered from the tensor viewpoint. In this paper we demonstrate how the use of dimensionally dependent tensor identities enables us to derive a number of 4-... |
1804.09224 | Jezreel Castillo | Jezreel Castillo, Ian Vega and Barry Wardell | Self-force on a scalar charge in a circular orbit about a
Reissner-Nordstr\"{o}m black hole | 8 pages, 5 figures, accepted for publication in PRD | Phys. Rev. D 98, 024024 (2018) | 10.1103/PhysRevD.98.024024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by applications to the study of self-force effects in scalar-tensor
theories of gravity, we calculate the self-force exerted on a scalar charge in
a circular orbit about a Reissner-Nordstr\"{o}m black hole. We obtain the
self-force via a mode-sum calculation, and find that our results differ from
recent pos... | [
{
"created": "Tue, 24 Apr 2018 19:29:00 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2018 00:13:09 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Jun 2018 08:07:47 GMT",
"version": "v3"
}
] | 2018-07-18 | [
[
"Castillo",
"Jezreel",
""
],
[
"Vega",
"Ian",
""
],
[
"Wardell",
"Barry",
""
]
] | Motivated by applications to the study of self-force effects in scalar-tensor theories of gravity, we calculate the self-force exerted on a scalar charge in a circular orbit about a Reissner-Nordstr\"{o}m black hole. We obtain the self-force via a mode-sum calculation, and find that our results differ from recent post-... |
1901.11522 | Lucas Gardai Collodel | Lucas G. Collodel, Burkhard Kleihaus, Jutta Kunz | On the Structure of Rotating Charged Boson Stars | null | Phys. Rev. D 99, 104076 (2019) | 10.1103/PhysRevD.99.104076 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present full sets of solutions for rotating charged boson
stars with different coupling values. By adopting local comoving coordinates,
we are able to find expressions for the effective hydrodynamic quantities of
the fluids as seen by this class of observers. We show that not only is the
energy densit... | [
{
"created": "Thu, 31 Jan 2019 18:43:02 GMT",
"version": "v1"
}
] | 2019-06-05 | [
[
"Collodel",
"Lucas G.",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | In this work we present full sets of solutions for rotating charged boson stars with different coupling values. By adopting local comoving coordinates, we are able to find expressions for the effective hydrodynamic quantities of the fluids as seen by this class of observers. We show that not only is the energy density ... |
2201.01484 | Sanjit Das | Gowtham Sidharth M and Sanjit Das | Shadow of Non-singular Rotating Magnetic Monopole in Perfect Fluid Dark
matter | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Bardeen proposed a gravitationally collapsing magnetic monopole black hole
solution which is free of singularity. In this article, we have studied the
size and shape of the rotating Bardeen blackhole shadow in presence of perfect
fluid dark matter. we have discussed how the parameters such a spin, magnetic
monopole c... | [
{
"created": "Wed, 5 Jan 2022 07:06:21 GMT",
"version": "v1"
}
] | 2022-01-06 | [
[
"M",
"Gowtham Sidharth",
""
],
[
"Das",
"Sanjit",
""
]
] | Bardeen proposed a gravitationally collapsing magnetic monopole black hole solution which is free of singularity. In this article, we have studied the size and shape of the rotating Bardeen blackhole shadow in presence of perfect fluid dark matter. we have discussed how the parameters such a spin, magnetic monopole cha... |
2009.02367 | Ramin G. Daghigh | Ramin G. Daghigh, Michael D. Green, Jodin C. Morey, Gabor Kunstatter | Scalar Perturbations of a Single-Horizon Regular Black Hole | 17 pages, 14 figures, accepted for publication in PRD | Phys. Rev. D 102, 104040 (2020) | 10.1103/PhysRevD.102.104040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the massless scalar field perturbations, including the
quasinormal mode spectrum and the ringdown waveform, of a regular black hole
spacetime that was derived via the Loop Quantum Gravity inspired polymer
quantization of spherical $4$D black holes. In contrast to most, if not all, of
the other regular ... | [
{
"created": "Fri, 4 Sep 2020 19:20:50 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2020 22:27:15 GMT",
"version": "v2"
}
] | 2020-11-25 | [
[
"Daghigh",
"Ramin G.",
""
],
[
"Green",
"Michael D.",
""
],
[
"Morey",
"Jodin C.",
""
],
[
"Kunstatter",
"Gabor",
""
]
] | We investigate the massless scalar field perturbations, including the quasinormal mode spectrum and the ringdown waveform, of a regular black hole spacetime that was derived via the Loop Quantum Gravity inspired polymer quantization of spherical $4$D black holes. In contrast to most, if not all, of the other regular bl... |
gr-qc/0005083 | Badri Krishnan | Abhay Ashtekar, Stephen Fairhurst and Badri Krishnan | Isolated Horizons: Hamiltonian Evolution and the First Law | 56 pages, 1 figure, Revtex; Final Version, to appear in PRD | Phys.Rev. D62 (2000) 104025 | 10.1103/PhysRevD.62.104025 | null | gr-qc hep-th | null | A framework was recently introduced to generalize black hole mechanics by
replacing stationary event horizons with isolated horizons. That framework is
significantly extended. The extension is non-trivial in that not only do the
boundary conditions now allow the horizon to be distorted and rotating, but
also the subs... | [
{
"created": "Thu, 18 May 2000 21:30:03 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 2000 17:30:14 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Aug 2000 19:11:40 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Fairhurst",
"Stephen",
""
],
[
"Krishnan",
"Badri",
""
]
] | A framework was recently introduced to generalize black hole mechanics by replacing stationary event horizons with isolated horizons. That framework is significantly extended. The extension is non-trivial in that not only do the boundary conditions now allow the horizon to be distorted and rotating, but also the subseq... |
2204.12510 | Gon\c{c}alo Castro | Gon\c{c}alo Castro, Leonardo Gualtieri, Andrea Maselli, Paolo Pani | Impact and detectability of spin-tidal couplings in neutron star
inspirals | 11 pages, 4 figures | null | 10.1103/PhysRevD.106.024011 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational wave signal from a binary neutron star merger carries the
imprint of the deformability properties of the coalescing bodies, and then of
the equation of state of neutron stars. In current models of the waveforms
emitted in these events, the contribution of tidal deformation is encoded in a
set of par... | [
{
"created": "Tue, 26 Apr 2022 18:00:03 GMT",
"version": "v1"
}
] | 2022-07-20 | [
[
"Castro",
"Gonçalo",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Pani",
"Paolo",
""
]
] | The gravitational wave signal from a binary neutron star merger carries the imprint of the deformability properties of the coalescing bodies, and then of the equation of state of neutron stars. In current models of the waveforms emitted in these events, the contribution of tidal deformation is encoded in a set of param... |
1905.03943 | Shankaranarayanan S | S. Shankaranarayanan (IIT Bombay) | Strong gravity signatures in the polarization of gravitational waves | Received Honourable mention in Gravity Research Foundation essay
competition-2019 | Int. J. Mod. Phys. D, 19440206 (2019) | 10.1142/S0218271819440206 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity is a hugely successful description of gravitation.
However, both theory and observations suggest that General Relativity might
have significant classical and quantum corrections in the Strong Gravity
regime. Testing the strong field limit of gravity is one of the main objectives
of the future gravi... | [
{
"created": "Fri, 10 May 2019 05:13:18 GMT",
"version": "v1"
}
] | 2019-09-27 | [
[
"Shankaranarayanan",
"S.",
"",
"IIT Bombay"
]
] | General Relativity is a hugely successful description of gravitation. However, both theory and observations suggest that General Relativity might have significant classical and quantum corrections in the Strong Gravity regime. Testing the strong field limit of gravity is one of the main objectives of the future gravita... |
1201.1778 | Luc Blanchet | Peter Wolf, Luc Blanchet, Christian J. Bord\'e, Serge Reynaud,
Christophe Salomon, Claude Cohen-Tannoudji | Reply to the comment on: "Does an atom interferometer test the
gravitational redshift at the Compton frequency?" | To appear in Classical and Quantum Gravity | Classical and Quantum Gravity 29 (2012) 048002 | 10.1088/0264-9381/29/4/048002 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hohensee, Chu, Peters and M\"uller have submitted a comment (arXiv:1112.6039
[gr-qc]) on our paper "Does an atom interferometer test the gravitational
redshift at the Compton frequency?", Classical and Quantum Gravity 28, 145017
(2011), arXiv:1009.2485 [gr-qc]. Here we reply to this comment and show that
the main res... | [
{
"created": "Mon, 9 Jan 2012 14:26:41 GMT",
"version": "v1"
}
] | 2014-09-16 | [
[
"Wolf",
"Peter",
""
],
[
"Blanchet",
"Luc",
""
],
[
"Bordé",
"Christian J.",
""
],
[
"Reynaud",
"Serge",
""
],
[
"Salomon",
"Christophe",
""
],
[
"Cohen-Tannoudji",
"Claude",
""
]
] | Hohensee, Chu, Peters and M\"uller have submitted a comment (arXiv:1112.6039 [gr-qc]) on our paper "Does an atom interferometer test the gravitational redshift at the Compton frequency?", Classical and Quantum Gravity 28, 145017 (2011), arXiv:1009.2485 [gr-qc]. Here we reply to this comment and show that the main resul... |
0909.0341 | Azam Izadi | Azam Izadi and Ali Shojai | Speed of light in the extended gravity theories | 19 pages. to appear in Classical Quantum Gravity | Class.Quant.Grav.26:195006,2009 | 10.1088/0264-9381/26/19/195006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We shall investigate the possibility of formulation of varying speed of light
(VSL) in the framework of Palatini non-linear Ricci scalar and Ricci squared
theories. Different speeds of light including the causal structure constant,
electromagnetic, and gravitational wave speeds are discussed. We shall see that
two lo... | [
{
"created": "Wed, 2 Sep 2009 08:08:00 GMT",
"version": "v1"
}
] | 2009-11-19 | [
[
"Izadi",
"Azam",
""
],
[
"Shojai",
"Ali",
""
]
] | We shall investigate the possibility of formulation of varying speed of light (VSL) in the framework of Palatini non-linear Ricci scalar and Ricci squared theories. Different speeds of light including the causal structure constant, electromagnetic, and gravitational wave speeds are discussed. We shall see that two loca... |
1507.05560 | Matthew Wright | Matthew Wright | Buchdahl's inequality in five dimensional Gauss-Bonnet gravity | Matches published version | General Relativity and Gravitation, 48(7), 1-15 (2016) | 10.1007/s10714-016-2091-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Buchdahl limit for static spherically symmetric isotropic stars is
generalised to the case of five dimensional Gauss-Bonnet gravity. Our result
depends on the sign of the Gauss-Bonnet coupling constant $\alpha$. When
$\alpha>0$, we find, unlike in general relativity, that the bound is dependent
on the stellar str... | [
{
"created": "Mon, 20 Jul 2015 16:46:44 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2016 09:29:40 GMT",
"version": "v2"
}
] | 2016-06-21 | [
[
"Wright",
"Matthew",
""
]
] | The Buchdahl limit for static spherically symmetric isotropic stars is generalised to the case of five dimensional Gauss-Bonnet gravity. Our result depends on the sign of the Gauss-Bonnet coupling constant $\alpha$. When $\alpha>0$, we find, unlike in general relativity, that the bound is dependent on the stellar struc... |
gr-qc/9302002 | Pohle | G.W. Gibbons and H.J. Pohle | Complex Numbers, Quantum Mechanics and the Beginning of Time | 27 pages LATEX, UCSBTH-93-03 | Nucl.Phys.B410:117-142,1993 | 10.1016/0550-3213(93)90575-A | null | gr-qc | null | A basic problem in quantizing a field in curved space is the decomposition of
the classical modes in positive and negative frequency. The decomposition is
equivalent to a choice of a complex structure in the space of classical
solutions. In our construction the real tunneling geometries provide the link
between the t... | [
{
"created": "Tue, 2 Feb 1993 22:58:27 GMT",
"version": "v1"
}
] | 2009-10-07 | [
[
"Gibbons",
"G. W.",
""
],
[
"Pohle",
"H. J.",
""
]
] | A basic problem in quantizing a field in curved space is the decomposition of the classical modes in positive and negative frequency. The decomposition is equivalent to a choice of a complex structure in the space of classical solutions. In our construction the real tunneling geometries provide the link between the thi... |
2308.00012 | Faizuddin Ahmed | Faizuddin Ahmed | A topologically charged four-dimensional wormhole and the energy
conditions | 19 pages; 6 figures, versionv2, published in JCAP
(https://doi.org/10.1088/1475-7516/2023/11/082) | JCAP 11 (2023) 082 | 10.1088/1475-7516/2023/11/082 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this research work, our primary focus revolves around the examination of a
specific category of traversable wormholes known as topologically charged
generalized Schwarzschild-Simpson-Visser-type wormhole,
$ds^2=-\Big(1-\frac{2\,M}{\sqrt{x^2+b^2}}\Big)\,dt^2+\Big(1-\frac{2\,M}{\sqrt{x^2+b^2}}\Big)^{-1}\,\Big(\frac{... | [
{
"created": "Sun, 30 Jul 2023 04:23:06 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2023 02:55:40 GMT",
"version": "v2"
}
] | 2023-11-29 | [
[
"Ahmed",
"Faizuddin",
""
]
] | In this research work, our primary focus revolves around the examination of a specific category of traversable wormholes known as topologically charged generalized Schwarzschild-Simpson-Visser-type wormhole, $ds^2=-\Big(1-\frac{2\,M}{\sqrt{x^2+b^2}}\Big)\,dt^2+\Big(1-\frac{2\,M}{\sqrt{x^2+b^2}}\Big)^{-1}\,\Big(\frac{dx... |
2001.11357 | Gamal G.L. Nashed | E. Elizalde, G.G.L. Nashed, S. Nojiri and S.D. Odintsov | Spherically symmetric black holes with electric and magnetic charge in
extended gravity: Physical properties, causal structure, and stability
analysis in Einstein's and Jordan's frames | 27 pages, 18 figures, will appear in EPJC | Eur. Phys. J. C (2020) 80:109 | 10.1140/epjc/s10052-020-7686-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Novel static black hole solutions with electric and magnetic charges are
derived for the class of modified gravities: $f({\cal R})={\cal
R}+2\beta\sqrt{{\cal R}}$, with or without a cosmological constant. The new
black holes behave asymptotically as flat or (A)dS space-times with a dynamical
value of the Ricci scalar... | [
{
"created": "Wed, 29 Jan 2020 08:38:49 GMT",
"version": "v1"
}
] | 2020-02-14 | [
[
"Elizalde",
"E.",
""
],
[
"Nashed",
"G. G. L.",
""
],
[
"Nojiri",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | Novel static black hole solutions with electric and magnetic charges are derived for the class of modified gravities: $f({\cal R})={\cal R}+2\beta\sqrt{{\cal R}}$, with or without a cosmological constant. The new black holes behave asymptotically as flat or (A)dS space-times with a dynamical value of the Ricci scalar g... |
gr-qc/9303036 | null | R. Laflamme and A. Matacz | Decoherence Functional and Inhomogeneities in the Early Universe | 15 pages in plain tex | Int. J. Mod. Phys. D2 (1993) 171-182 | 10.1142/S0218271893000155 | null | gr-qc | null | We investigate the quantum to classical transition of small inhomogeneous
fluctuations in the early Universe using the decoherence functional of
Gell-Mann and Hartle. We study two types of coarse graining; one due to coarse
graining the value of the scalar field and the other due to summing over an
environment. We co... | [
{
"created": "Tue, 30 Mar 1993 15:08:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Laflamme",
"R.",
""
],
[
"Matacz",
"A.",
""
]
] | We investigate the quantum to classical transition of small inhomogeneous fluctuations in the early Universe using the decoherence functional of Gell-Mann and Hartle. We study two types of coarse graining; one due to coarse graining the value of the scalar field and the other due to summing over an environment. We comp... |
gr-qc/0107055 | Moninder Singh Modgil | Moninder Singh Modgil and Deshdeep Sahdev | Recurrence metrics and the physics of closed time-like curves | null | null | null | null | gr-qc | null | We investigate vacuum solutions of Einstein's equation for a universe with an
S^1 topology of time. Such a universe behaves like a time-machine and has
geodesics which coincide with closed time-like curves (CTCs). A system evolving
along a CTC experiences the Loschmidt velocity reversion and undergoes a
recurrence co... | [
{
"created": "Mon, 16 Jul 2001 11:21:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Modgil",
"Moninder Singh",
""
],
[
"Sahdev",
"Deshdeep",
""
]
] | We investigate vacuum solutions of Einstein's equation for a universe with an S^1 topology of time. Such a universe behaves like a time-machine and has geodesics which coincide with closed time-like curves (CTCs). A system evolving along a CTC experiences the Loschmidt velocity reversion and undergoes a recurrence comm... |
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