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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1904.09989 | Hiroki Takeda | Hiroki Takeda, Atsushi Nishizawa, Koji Nagano, Yuta Michimura, Kentaro
Komori, Masaki Ando, and Kazuhiro Hayama | Prospects for gravitational-wave polarization test from compact binary
mergers with future ground-based detectors | 12 pages, 4 figures | Phys. Rev. D 100, 042001 (2019) | 10.1103/PhysRevD.100.042001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There exist six possible polarization modes of gravitational waves in general
metric theory of gravity, while two tensor polarization modes are allowed in
general relativity. The properties and number of polarization modes depend on
gravity theories. The number of the detectors needs to be equal to the number
of the ... | [
{
"created": "Mon, 22 Apr 2019 18:00:00 GMT",
"version": "v1"
}
] | 2019-08-28 | [
[
"Takeda",
"Hiroki",
""
],
[
"Nishizawa",
"Atsushi",
""
],
[
"Nagano",
"Koji",
""
],
[
"Michimura",
"Yuta",
""
],
[
"Komori",
"Kentaro",
""
],
[
"Ando",
"Masaki",
""
],
[
"Hayama",
"Kazuhiro",
""
]
] | There exist six possible polarization modes of gravitational waves in general metric theory of gravity, while two tensor polarization modes are allowed in general relativity. The properties and number of polarization modes depend on gravity theories. The number of the detectors needs to be equal to the number of the po... |
0808.2449 | Richard Woodard | T. M. Janssen (Utrecht), S. P. Miao (Utrecht), T. Prokopec (Utrecht)
and R. P. Woodard (Florida) | Infrared Propagator Corrections for Constant Deceleration | 34 pages, uses LaTeX 2 epsilon | Class.Quant.Grav.25:245013,2008 | 10.1088/0264-9381/25/24/245013 | SPIN-08-38, ITP-UU-08/48, UFIFT-QG-08-06 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the propagator for a massless, minimally coupled scalar on a
$D$-dimensional, spatially flat, homogeneous and isotropic background with
arbitrary constant deceleration parameter. Our construction uses the operator
formalism, by integrating the Fourier mode sum. We give special attention to
infrared correcti... | [
{
"created": "Mon, 18 Aug 2008 18:22:34 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Janssen",
"T. M.",
"",
"Utrecht"
],
[
"Miao",
"S. P.",
"",
"Utrecht"
],
[
"Prokopec",
"T.",
"",
"Utrecht"
],
[
"Woodard",
"R. P.",
"",
"Florida"
]
] | We derive the propagator for a massless, minimally coupled scalar on a $D$-dimensional, spatially flat, homogeneous and isotropic background with arbitrary constant deceleration parameter. Our construction uses the operator formalism, by integrating the Fourier mode sum. We give special attention to infrared correction... |
1506.07579 | Mauricio Cataldo MC | Mauricio Cataldo, Antonella Cid, Pedro Labra\~na and Patricio Mella | Cosmic anisotropic doomsday in Bianchi type I universes | 10 pages, 6 figures, Accepted for publication in Journal of
Mathematical Physics (2016) | J. Math. Phys. 57, 112502 (2016) | 10.1063/1.4967954 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to investigate if the anisotropy of the spacetime may induce future
singularities at a finite value of the cosmic time on the evolution of
cosmological models, we study vacuum and non-vacuum Bianchi type I spacetimes
exhibiting such future singularities. We show that in the case of Kasner vacuum
cosmologies ... | [
{
"created": "Wed, 24 Jun 2015 22:50:36 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2016 17:19:12 GMT",
"version": "v2"
}
] | 2016-11-30 | [
[
"Cataldo",
"Mauricio",
""
],
[
"Cid",
"Antonella",
""
],
[
"Labraña",
"Pedro",
""
],
[
"Mella",
"Patricio",
""
]
] | In order to investigate if the anisotropy of the spacetime may induce future singularities at a finite value of the cosmic time on the evolution of cosmological models, we study vacuum and non-vacuum Bianchi type I spacetimes exhibiting such future singularities. We show that in the case of Kasner vacuum cosmologies th... |
2308.00844 | Chad Briddon | Chad Briddon, Clare Burrage, Adam Moss, and Andrius Tamosiunas | Using machine learning to optimise chameleon fifth force experiments | 28 pages, 17 figures, The SELCIE code is available at:
https://github.com/C-Briddon/SELCIE | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The chameleon is a theorised scalar field that couples to matter and possess
a screening mechanism, which weakens observational constraints from experiments
performed in regions of higher matter density. One consequence of this
screening mechanism is that the force induced by the field is dependent on the
shape of th... | [
{
"created": "Tue, 1 Aug 2023 21:18:35 GMT",
"version": "v1"
}
] | 2023-08-03 | [
[
"Briddon",
"Chad",
""
],
[
"Burrage",
"Clare",
""
],
[
"Moss",
"Adam",
""
],
[
"Tamosiunas",
"Andrius",
""
]
] | The chameleon is a theorised scalar field that couples to matter and possess a screening mechanism, which weakens observational constraints from experiments performed in regions of higher matter density. One consequence of this screening mechanism is that the force induced by the field is dependent on the shape of the ... |
1509.00148 | J. Ponce de Leon | J. Ponce de Leon | Embeddings for General Relativity | Accepted for publication in Classical and Quantum Gravity | null | 10.1088/0264-9381/32/19/195018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic approach to embed $n$-dimensional vacuum general
relativity in an $(n + 1)$-dimensional pseudo-Riemannian spacetime whose source
is either a (non)zero cosmological constant or a scalar field minimally-coupled
to Einstein gravity. Our approach allows us to generalize a number of results
discuss... | [
{
"created": "Tue, 1 Sep 2015 05:29:13 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"de Leon",
"J. Ponce",
""
]
] | We present a systematic approach to embed $n$-dimensional vacuum general relativity in an $(n + 1)$-dimensional pseudo-Riemannian spacetime whose source is either a (non)zero cosmological constant or a scalar field minimally-coupled to Einstein gravity. Our approach allows us to generalize a number of results discussed... |
1502.07750 | Adam Stevens | Adam R. H. Stevens | Liberation of specific angular momentum through radiation and scattering
in relativistic black-hole accretion discs | 6 pages, 2 figures. Accepted for publication in PASA | null | null | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A key component of explaining the array of galaxies observed in the Universe
is the feedback of active galactic nuclei, each powered by a massive black
hole's accretion disc. For accretion to occur, angular momentum must be lost by
that which is accreted. Electromagnetic radiation must offer some respite in
this rega... | [
{
"created": "Thu, 26 Feb 2015 21:00:06 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2015 03:08:33 GMT",
"version": "v2"
}
] | 2015-07-17 | [
[
"Stevens",
"Adam R. H.",
""
]
] | A key component of explaining the array of galaxies observed in the Universe is the feedback of active galactic nuclei, each powered by a massive black hole's accretion disc. For accretion to occur, angular momentum must be lost by that which is accreted. Electromagnetic radiation must offer some respite in this regard... |
gr-qc/0606056 | Mizuno Shuntaro | Kazuya Koyama and Shuntaro Mizuno | Inflaton perturbations in brane-world cosmology with induced gravity | 20 pages, 4 figures | JCAP 0607 (2006) 013 | 10.1088/1475-7516/2006/07/013 | ICG 06/30, RESCEU-15/06 | gr-qc astro-ph hep-th | null | We study cosmological perturbations in the brane models with an induced
Einstein-Hilbert term on a brane. We consider an inflaton confined to a de
Sitter brane in a five-dimensional Minkowski spacetime. Inflaton fluctuations
excite Kaluza-Klein modes of bulk metric perturbations with mass $m^2 =
-2(2\ell-1) (\ell +1)... | [
{
"created": "Tue, 13 Jun 2006 02:29:57 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Koyama",
"Kazuya",
""
],
[
"Mizuno",
"Shuntaro",
""
]
] | We study cosmological perturbations in the brane models with an induced Einstein-Hilbert term on a brane. We consider an inflaton confined to a de Sitter brane in a five-dimensional Minkowski spacetime. Inflaton fluctuations excite Kaluza-Klein modes of bulk metric perturbations with mass $m^2 = -2(2\ell-1) (\ell +1) H... |
gr-qc/9606054 | Yuri Ponomarev | V.Burdyuzha(1), O.Lalakulich(2), Yu.Ponomarev(1), G.Vereshkov(2) ((1)
Astro Space Centre Lebedev Physical Institute of Russian Academy of Sciences,
(2) Scientific Research Institute of Physics of Rostov State University) | The New Scenario of the Initial Evolution of the Universe | 11 pages (RevTex), 5 PostScript figures. Submitted to Physical Review
Letters | Phys.Rev.D55:7340-7344,1997 | 10.1103/PhysRevD.55.7340 | null | gr-qc | null | We propose that the Universe created from "nothing" with relatively small
particles number and quickly relaxed to quasiequilibrium state at the Planck
parameters. The classic cosmological solution for this Universe with
Lambda-term has two branches divided by the gap. The quantum process of
tunneling between the cosm... | [
{
"created": "Tue, 18 Jun 1996 14:01:25 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Burdyuzha",
"V.",
""
],
[
"Lalakulich",
"O.",
""
],
[
"Ponomarev",
"Yu.",
""
],
[
"Vereshkov",
"G.",
""
]
] | We propose that the Universe created from "nothing" with relatively small particles number and quickly relaxed to quasiequilibrium state at the Planck parameters. The classic cosmological solution for this Universe with Lambda-term has two branches divided by the gap. The quantum process of tunneling between the cosmol... |
gr-qc/0505034 | Tiberiu Harko | M. K. Mak, T. Harko | Chaplygin gas dominated anisotropic brane world cosmological models | 13 pages, 6 figures, accepted for publication in PRD | Phys.Rev. D71 (2005) 104022 | 10.1103/PhysRevD.71.104022 | null | gr-qc hep-th | null | We present exact solutions of the gravitational field equations in the
generalized Randall-Sundrum model for an anisotropic brane with Bianchi type I
geometry, with a generalized Chaplygin gas as matter source. The generalized
Chaplygin gas, which interpolates between a high density relativistic era and a
non-relativ... | [
{
"created": "Mon, 9 May 2005 02:58:40 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Mak",
"M. K.",
""
],
[
"Harko",
"T.",
""
]
] | We present exact solutions of the gravitational field equations in the generalized Randall-Sundrum model for an anisotropic brane with Bianchi type I geometry, with a generalized Chaplygin gas as matter source. The generalized Chaplygin gas, which interpolates between a high density relativistic era and a non-relativis... |
2208.02367 | Matthew Duez | Milad Haddadi, Matthew D. Duez, Francois Foucart, Teresita Ramirez,
Rodrigo Fernandez, Alexander L. Knight, Jerred Jesse, Francois Hebert,
Lawrence E. Kidder, Harald P. Pfeiffer, Mark A. Scheel | Late-time post-merger modeling of a compact binary: effects of
relativity, r-process heating, and treatment of transport effects | 23 pages, 7 figures, version accepted to Classical and Quantum
Gravity | null | 10.1088/1361-6382/acc0c6 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Detectable electromagnetic counterparts to gravitational waves from compact
binary mergers can be produced by outflows from the black hole-accretion disk
remnant during the first ten seconds after the merger. Two-dimensional
axisymmetric simulations with effective viscosity remain an efficient and
informative way to ... | [
{
"created": "Wed, 3 Aug 2022 22:26:42 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 2023 17:56:56 GMT",
"version": "v2"
}
] | 2023-04-05 | [
[
"Haddadi",
"Milad",
""
],
[
"Duez",
"Matthew D.",
""
],
[
"Foucart",
"Francois",
""
],
[
"Ramirez",
"Teresita",
""
],
[
"Fernandez",
"Rodrigo",
""
],
[
"Knight",
"Alexander L.",
""
],
[
"Jesse",
"Jerred",
"... | Detectable electromagnetic counterparts to gravitational waves from compact binary mergers can be produced by outflows from the black hole-accretion disk remnant during the first ten seconds after the merger. Two-dimensional axisymmetric simulations with effective viscosity remain an efficient and informative way to mo... |
1302.4411 | Ehoud Pazy | E. Pazy | Quantum statistical modified entropic gravity as a theoretical basis for
MOND | 17 pages, no figures, added references | Phys. Rev. D 87, 084063 (2013) | 10.1103/PhysRevD.87.084063 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the quantum statistics of the degrees of freedom on the
holographic screen it is shown that the ratio of the number of excited bulk
degrees of freedom to the number of excited surface degrees of freedom, is
given by the MOND interpolating function {\mu}. This relationship is shown to
hold also in AQUAL, a... | [
{
"created": "Mon, 18 Feb 2013 20:22:59 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2013 15:39:42 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Pazy",
"E.",
""
]
] | Considering the quantum statistics of the degrees of freedom on the holographic screen it is shown that the ratio of the number of excited bulk degrees of freedom to the number of excited surface degrees of freedom, is given by the MOND interpolating function {\mu}. This relationship is shown to hold also in AQUAL, and... |
gr-qc/0012003 | Gerard Clement | M. Azreg-Ainou, G. Clement, C.P. Constantinidis and J.C. Fabris | Regularity and stability of electrostatic solutions in Kaluza-Klein
theory | 2 pages, "mprocl.sty" with LATEX 2.09, contribution to the 9th Marcel
Grossmann meeting (MG9), Rome, July 2000 | null | null | null | gr-qc hep-th | null | We investigate the family of electrostatic spherically symmetric solutions of
the five-dimensional Kaluza-Klein theory. Besides black holes and wormholes, a
new class of geodesically complete solutions is identified. A monopole
perturbation is carried out, enabling us to prove analytically the stability of
a large cl... | [
{
"created": "Fri, 1 Dec 2000 16:08:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"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. Besides black holes and wormholes, a new class of geodesically complete solutions is identified. A monopole perturbation is carried out, enabling us to prove analytically the stability of a large clas... |
1705.03278 | Petarpa Boonserm | Petarpa Boonserm, Tritos Ngampitipan, Pitayuth Wongjun | Greybody factor for black holes in dRGT massive gravity | V1: 21 pages, 8 figures; V2: 7 references added, no physics changes,
now 11 pages (2 columns) | null | 10.1140/epjc/s10052-018-5975-x | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity, greybody factor is a quantity related to the quantum
nature of a black hole. A high value of greybody factor indicates a high
probability that Hawking radiation can reach infinity. Although general
relativity is correct and has been successful in describing many phenomena,
there are some questi... | [
{
"created": "Tue, 9 May 2017 11:25:20 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jul 2017 12:26:34 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Boonserm",
"Petarpa",
""
],
[
"Ngampitipan",
"Tritos",
""
],
[
"Wongjun",
"Pitayuth",
""
]
] | In general relativity, greybody factor is a quantity related to the quantum nature of a black hole. A high value of greybody factor indicates a high probability that Hawking radiation can reach infinity. Although general relativity is correct and has been successful in describing many phenomena, there are some question... |
2102.05893 | Subenoy Chakraborty | Sanjukta Chakraborty, Akash Bose and Subenoy Chakraborty | Collapse Geometry in Inhomogeneous FRW model | null | International Journal of Geometric Methods in Modern Physics, Vol.
18, No. 02, 2150019 (2021) | 10.1142/S0219887821500195 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Collapsing process is studied in special type of inhomogeneous spherically
symmetric space-time model (known as IFRW model), having no time-like Killing
vector field. The matter field for collapse dynamics is considered to be
perfect fluid with anisotropic pressure. The main issue of the present
investigation is to e... | [
{
"created": "Thu, 11 Feb 2021 08:53:54 GMT",
"version": "v1"
}
] | 2021-02-12 | [
[
"Chakraborty",
"Sanjukta",
""
],
[
"Bose",
"Akash",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | Collapsing process is studied in special type of inhomogeneous spherically symmetric space-time model (known as IFRW model), having no time-like Killing vector field. The matter field for collapse dynamics is considered to be perfect fluid with anisotropic pressure. The main issue of the present investigation is to exa... |
1302.0254 | Ivan Agullo | Ivan Agullo, Abhay Ashtekar, and William Nelson | The pre-inflationary dynamics of loop quantum cosmology: Confronting
quantum gravity with observations | 64 pages, 15 figures. Published version | Class. Quant. Grav. 30, 085014 (2013) | 10.1088/0264-9381/30/8/085014 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using techniques from loop quantum gravity, the standard theory of
cosmological perturbations was recently generalized to encompass the Planck
era. We now apply this framework to explore pre-inflationary dynamics. The
framework enables us to isolate and resolve the true trans-Planckian
difficulties, with interesting ... | [
{
"created": "Fri, 1 Feb 2013 19:12:40 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2013 08:55:00 GMT",
"version": "v2"
}
] | 2015-03-12 | [
[
"Agullo",
"Ivan",
""
],
[
"Ashtekar",
"Abhay",
""
],
[
"Nelson",
"William",
""
]
] | Using techniques from loop quantum gravity, the standard theory of cosmological perturbations was recently generalized to encompass the Planck era. We now apply this framework to explore pre-inflationary dynamics. The framework enables us to isolate and resolve the true trans-Planckian difficulties, with interesting le... |
gr-qc/0401037 | Wung-Hong Huang | Wung-Hong Huang | Quantum Field Effect on Symmetry Breaking and Restoration in Anisotropic
Spacetimes | null | Phys.Rev.D42:1287,1990 | 10.1103/PhysRevD.42.1287 | null | gr-qc hep-th | null | The one-loop effective potential for $\phi ^4$ theory on a Bianchi type-I
universe is evaluated in the adiabatic approximation. It is used to see the
quantum-field effects on symmetry breaking and restoration in anisotropic
spacetimes. The results show that the fate of symmetry will not be changed in
the cases of con... | [
{
"created": "Sat, 10 Jan 2004 15:04:44 GMT",
"version": "v1"
}
] | 2008-12-24 | [
[
"Huang",
"Wung-Hong",
""
]
] | The one-loop effective potential for $\phi ^4$ theory on a Bianchi type-I universe is evaluated in the adiabatic approximation. It is used to see the quantum-field effects on symmetry breaking and restoration in anisotropic spacetimes. The results show that the fate of symmetry will not be changed in the cases of confo... |
gr-qc/0409052 | Donato Bini | Donato Bini, Luca Lusanna, Bahram Mashhoon | Limitations of Radar Coordinates | 12 pages, revtex and pictex macros, 3 pictex figures, 1 eps figure.
Expanded version | Int.J.Mod.Phys. D14 (2005) 1413-1429 | 10.1142/S0218271805006961 | null | gr-qc astro-ph | null | The construction of a radar coordinate system about the world line of an
observer is discussed. Radar coordinates for a hyperbolic observer as well as a
uniformly rotating observer are described in detail. The utility of the notion
of radar distance and the admissibility of radar coordinates are investigated.
Our res... | [
{
"created": "Mon, 13 Sep 2004 07:12:12 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2004 08:34:53 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bini",
"Donato",
""
],
[
"Lusanna",
"Luca",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | The construction of a radar coordinate system about the world line of an observer is discussed. Radar coordinates for a hyperbolic observer as well as a uniformly rotating observer are described in detail. The utility of the notion of radar distance and the admissibility of radar coordinates are investigated. Our resul... |
2005.11090 | Oleg Zaslavskii | O. B. Zaslavskii | Super-Penrose process for extremal charged white holes | 11 pages. Sec. VII added with brief comparison of mass-inflation and
super-Penrose process | Mod. Phys. Lett. A. 36 (2021) 2150020 | 10.1142/S0217732321500206 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider collision of two particles 1 and 2 near the horizon of the
extremal Reissner-Nordstr\"{o}m (RN) black hole that produce two other
particles 3 and 4. There exists such a scenario that both new particles fall in
a black hole. One of them emerges from the white hole horizon in the
asymptotically flat region,... | [
{
"created": "Fri, 22 May 2020 10:24:08 GMT",
"version": "v1"
},
{
"created": "Thu, 28 May 2020 19:09:25 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Sep 2020 14:27:40 GMT",
"version": "v3"
}
] | 2021-02-24 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider collision of two particles 1 and 2 near the horizon of the extremal Reissner-Nordstr\"{o}m (RN) black hole that produce two other particles 3 and 4. There exists such a scenario that both new particles fall in a black hole. One of them emerges from the white hole horizon in the asymptotically flat region, t... |
2111.09307 | Andrew J. S. Hamilton | Andrew J. S. Hamilton | The rules of 4-dimensional perspective: How to implement Lorentz
transformations in relativistic visualization | 13 pages, 2 figures. Invited keynote lecture at the ENGAGE 2021
workshop at the Computer Graphics International CGI 2021 conference, 6-10 Sep
2021 | "Advances in Computer Graphics", 38th Computer Graphics
International Conference CGI 2021, Proceedings, eds. N. Magnenat-Thalmann, V.
Interrante, D. Thalmann, G. Papagiannakis, B. Sheng, J. Kim, M. Gavrilova,
pages 705-717 | 10.1007/978-3-030-89029-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This paper presents a pedagogical introduction to the issue of how to
implement Lorentz transformations in relativistic visualization. The most
efficient approach is to use the even geometric algebra in 3+1 spacetime
dimensions, or equivalently complex quaternions, which are fast, compact, and
robust, and straightfor... | [
{
"created": "Tue, 16 Nov 2021 23:06:59 GMT",
"version": "v1"
}
] | 2021-11-19 | [
[
"Hamilton",
"Andrew J. S.",
""
]
] | This paper presents a pedagogical introduction to the issue of how to implement Lorentz transformations in relativistic visualization. The most efficient approach is to use the even geometric algebra in 3+1 spacetime dimensions, or equivalently complex quaternions, which are fast, compact, and robust, and straightforwa... |
2102.08717 | Suresh C. Jaryal | Ayan Chatterjee and Suresh C. Jaryal | Gravitationally collapsing stars in $f(R)$ gravity | 23 pages, 35 figures | null | 10.1140/epjc/s10052-021-09079-8 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The gravitational dynamics of a collapsing matter configuration which is
simultaneously radiating heat flux is studied in $f(R)$ gravity. Three
particular functional forms in $f(R)$ gravity are considered to show that it is
possible to envisage boundary conditions such that the end state of the
collapse has a weak si... | [
{
"created": "Wed, 17 Feb 2021 12:07:36 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2021 07:25:07 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Apr 2021 10:05:24 GMT",
"version": "v3"
}
] | 2021-04-05 | [
[
"Chatterjee",
"Ayan",
""
],
[
"Jaryal",
"Suresh C.",
""
]
] | The gravitational dynamics of a collapsing matter configuration which is simultaneously radiating heat flux is studied in $f(R)$ gravity. Three particular functional forms in $f(R)$ gravity are considered to show that it is possible to envisage boundary conditions such that the end state of the collapse has a weak sing... |
1202.0999 | Pedro J Mora | Pedro J. Mora and Richard P. Woodard | Linearized Weyl-Weyl Correlator in a de Sitter Breaking Gauge | 31 pages, 2 tables, no figures, uses LaTex2e | null | 10.1103/PhysRevD.85.124048 | UFIFT-QG-12-01 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a de Sitter breaking graviton propagator to compute the tree order
correlator between noncoincident Weyl tensors on a locally de Sitter
background. An explicit, and very simple result is obtained, for any spacetime
dimension D, in terms of a de Sitter invariant length function and the tensor
basis constructed ... | [
{
"created": "Sun, 5 Feb 2012 20:17:57 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Mora",
"Pedro J.",
""
],
[
"Woodard",
"Richard P.",
""
]
] | We use a de Sitter breaking graviton propagator to compute the tree order correlator between noncoincident Weyl tensors on a locally de Sitter background. An explicit, and very simple result is obtained, for any spacetime dimension D, in terms of a de Sitter invariant length function and the tensor basis constructed fr... |
gr-qc/0507021 | Jerry B. Griffiths | J. B. Griffiths and J. Podolsky | Accelerating and rotating black holes | 14 pages, 1 figure. To appear in Class. Quantum Grav | Class.Quant.Grav. 22 (2005) 3467-3480 | 10.1088/0264-9381/22/17/008 | null | gr-qc | null | An exact solution of Einstein's equations which represents a pair of
accelerating and rotating black holes (a generalised form of the spinning
C-metric) is presented. The starting point is a form of the Plebanski-Demianski
metric which, in addition to the usual parameters, explicitly includes
parameters which describ... | [
{
"created": "Wed, 6 Jul 2005 14:50:49 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Griffiths",
"J. B.",
""
],
[
"Podolsky",
"J.",
""
]
] | An exact solution of Einstein's equations which represents a pair of accelerating and rotating black holes (a generalised form of the spinning C-metric) is presented. The starting point is a form of the Plebanski-Demianski metric which, in addition to the usual parameters, explicitly includes parameters which describe ... |
1906.10840 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu, Robert B. Mann | Repulsive Interactions and Universal Properties of Charged Anti-de
Sitter Black Hole Microstructures | 5 pages, 4 figures | Phys. Rev. Lett. 123, 071103 (2019) | 10.1103/PhysRevLett.123.071103 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Ruppeiner geometry of thermodynamic fluctuations provides a powerful
diagnostic of black hole microstructures. We investigate this for charged AdS
black holes and find that while an attractive microstructure interaction
dominates for most parameter ranges, a weak repulsive interaction dominates for
small black ho... | [
{
"created": "Wed, 26 Jun 2019 04:16:59 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Aug 2019 08:28:38 GMT",
"version": "v2"
}
] | 2019-08-21 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Mann",
"Robert B.",
""
]
] | The Ruppeiner geometry of thermodynamic fluctuations provides a powerful diagnostic of black hole microstructures. We investigate this for charged AdS black holes and find that while an attractive microstructure interaction dominates for most parameter ranges, a weak repulsive interaction dominates for small black hole... |
gr-qc/0002085 | Vladimir Ivashchuk | V. D. Ivashchuk and V. N. Melnikov | P-brane black holes for general intersections | 12 pages, Latex, few typos are eliminated, a correct relation for
parameters of special block-orthogonal solution is added (p. 6) | Grav. Cosmol. 5 (1999) 313-318 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole generalized p-brane solutions for a wide class of intersection
rules are presented. The solutions are defined on a manifold that contains a
product of n - 1 Ricci-flat internal spaces. They are defined up to moduli
functions H_s = H_s(R) obeying a non-linear differential equations (equivalent
to Toda-type ... | [
{
"created": "Fri, 25 Feb 2000 06:48:24 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Apr 2009 17:39:32 GMT",
"version": "v2"
}
] | 2009-04-17 | [
[
"Ivashchuk",
"V. D.",
""
],
[
"Melnikov",
"V. N.",
""
]
] | Black hole generalized p-brane solutions for a wide class of intersection rules are presented. The solutions are defined on a manifold that contains a product of n - 1 Ricci-flat internal spaces. They are defined up to moduli functions H_s = H_s(R) obeying a non-linear differential equations (equivalent to Toda-type eq... |
1203.0205 | Ghulam Abbas | M. Sharif, G. Abbas | Non-Commutative Correction to Thin Shell Collapse in Reissner
Nordstr$\ddot{o}$m Geometry | 18 pages,17 figures | J. Phys. Soc. Jpn 81(2012) 044002 | 10.1143/JPSJ.81.044002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates the polytropic matter shell collapse in the
non-commutative Reissner-Nordstr$\ddot{o}$m geometry. Using the Israel
criteria, equation of motion for the polytropic matter shell is derived. In
order to explore the physical aspects of this equation, the most general
equation of state, $p=k{\rho}^... | [
{
"created": "Wed, 29 Feb 2012 06:54:49 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2012 08:41:50 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Sharif",
"M.",
""
],
[
"Abbas",
"G.",
""
]
] | This paper investigates the polytropic matter shell collapse in the non-commutative Reissner-Nordstr$\ddot{o}$m geometry. Using the Israel criteria, equation of motion for the polytropic matter shell is derived. In order to explore the physical aspects of this equation, the most general equation of state, $p=k{\rho}^{(... |
gr-qc/0508019 | Robert Brout | Robert Brout | From Inflation to Dark Energy | 4 pages, RevTex | null | null | null | gr-qc | null | It is proposed that after the macroscopic fluctuation of energy density that
is responsible for inflation dies away, a class of microscopic fluctuations,
always present, survives to give the present day dark energy. This latter is
simply a reinterpretation of the causet mechanism of Ahmed, Dodelson, Green and
Sorkin,... | [
{
"created": "Thu, 4 Aug 2005 17:48:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brout",
"Robert",
""
]
] | It is proposed that after the macroscopic fluctuation of energy density that is responsible for inflation dies away, a class of microscopic fluctuations, always present, survives to give the present day dark energy. This latter is simply a reinterpretation of the causet mechanism of Ahmed, Dodelson, Green and Sorkin, w... |
1608.01960 | Emmanuil Saridakis | Rafael C. Nunes, Alexander Bonilla, Supriya Pan, Emmanuel N. Saridakis | Observational Constraints on $f(T)$ gravity from varying fundamental
constants | 9 pages, 6 figures, 3 Tables, version published in Eur.Phys.J. C | Eur.Phys.J. C77 (2017) 230 | 10.1140/epjc/s10052-017-4798-5 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use observations related to the variation of fundamental constants, in
order to impose constraints on the viable and most used $f(T)$ gravity models.
In particular, for the fine-structure constant we use direct measurements
obtained by different spectrographic methods, while for the effective Newton's
constant we ... | [
{
"created": "Fri, 5 Aug 2016 18:07:27 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Oct 2016 11:25:06 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Apr 2017 15:02:12 GMT",
"version": "v3"
}
] | 2017-04-18 | [
[
"Nunes",
"Rafael C.",
""
],
[
"Bonilla",
"Alexander",
""
],
[
"Pan",
"Supriya",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We use observations related to the variation of fundamental constants, in order to impose constraints on the viable and most used $f(T)$ gravity models. In particular, for the fine-structure constant we use direct measurements obtained by different spectrographic methods, while for the effective Newton's constant we us... |
2404.18964 | Bikramarka Samadder Choudhury Mr. | Farook Rahaman, Bikramarka S Choudhury | Evolving wormhole geometry from dark matter energy density | Paper is accepted for publication in 'The European Physical Journal
C' | null | 10.1140/epjc/s10052-024-12859-7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We analyze traversable wormholes defined by the dynamic line elements that
asymptotically approaches Friedmann-Robertson-Walker (FRW) universe. This
dynamical wormholes is supported by the galactic dark matter as well as perfect
isotropic fluid. We will discuss several evolving Lorentzian wormholes
comprising with di... | [
{
"created": "Mon, 29 Apr 2024 11:20:23 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Rahaman",
"Farook",
""
],
[
"Choudhury",
"Bikramarka S",
""
]
] | We analyze traversable wormholes defined by the dynamic line elements that asymptotically approaches Friedmann-Robertson-Walker (FRW) universe. This dynamical wormholes is supported by the galactic dark matter as well as perfect isotropic fluid. We will discuss several evolving Lorentzian wormholes comprising with diff... |
1709.01525 | Vitor Cardoso | Vitor Cardoso, Paolo Pani | Tests for the existence of horizons through gravitational wave echoes | Published in Nature Astronomy, expanded version with further details
available at arXiv:1707.03021 | Nature Astronomy 1: 586-591 (2017) | 10.1038/s41550-017-0225-y | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of black holes and of spacetime singularities is a fundamental
issue in science. Despite this, observations supporting their existence are
scarce, and their interpretation unclear. We overview how strong a case for
black holes has been made in the last few decades, and how well observations
adjust to th... | [
{
"created": "Tue, 5 Sep 2017 18:00:26 GMT",
"version": "v1"
}
] | 2017-09-07 | [
[
"Cardoso",
"Vitor",
""
],
[
"Pani",
"Paolo",
""
]
] | The existence of black holes and of spacetime singularities is a fundamental issue in science. Despite this, observations supporting their existence are scarce, and their interpretation unclear. We overview how strong a case for black holes has been made in the last few decades, and how well observations adjust to this... |
0903.3368 | Salvatore Capozziello | S. Capozziello and S. Vignolo | A comment on "The Cauchy problem of f(R)- gravity", Class. Quantum
Grav., 24, 5667 (2007), arXiv:0709.4414 | 3 pages | Class.Quant.Grav.24:5667,2007; Class.Quant.Grav.26:168001,2009 | 10.1088/0264-9381/26/16/168001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A critical comment on [N. Lanahan--Tremblay and V. Faraoni, 2007, {\it Class.
Quantum Grav.}, {\bf 24}, 5667, arXiv:0709.4414] is given discussing the
well-formulation of the Chauchy problem for $f(R)$-gravity in metric-affine
theories.
| [
{
"created": "Thu, 19 Mar 2009 17:02:54 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Capozziello",
"S.",
""
],
[
"Vignolo",
"S.",
""
]
] | A critical comment on [N. Lanahan--Tremblay and V. Faraoni, 2007, {\it Class. Quantum Grav.}, {\bf 24}, 5667, arXiv:0709.4414] is given discussing the well-formulation of the Chauchy problem for $f(R)$-gravity in metric-affine theories. |
0807.0665 | Dah-Wei Chiou | Dah-Wei Chiou | Phenomenological loop quantum geometry of the Schwarzschild black hole | 26 pages, 6 figures, 1 table; version to appear in PRD | Phys.Rev.D78:064040,2008 | 10.1103/PhysRevD.78.064040 | IGC-08/7-1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interior of a Schwarzschild black hole is investigated at the level of
phenomenological dynamics with the discreteness corrections of loop quantum
geometry implemented in two different improved quantization schemes. In one
scheme, the classical black hole singularity is resolved by the quantum bounce,
which bridg... | [
{
"created": "Fri, 4 Jul 2008 03:10:40 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Sep 2008 10:04:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chiou",
"Dah-Wei",
""
]
] | The interior of a Schwarzschild black hole is investigated at the level of phenomenological dynamics with the discreteness corrections of loop quantum geometry implemented in two different improved quantization schemes. In one scheme, the classical black hole singularity is resolved by the quantum bounce, which bridges... |
2303.12842 | Emma Albertini | Emma Albertini, Kyle Barnes, Gabriel Herczeg | Dynamical Henneaux-Teitelboim Gravity | 10 pages, 2 figures | null | 10.1103/PhysRevD.108.024031 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider a modified gravity model which we call "dynamical
Henneaux-Teitelboim gravity" because of its close relationship with the
Henneaux-Teitelboim formulation of unimodular gravity. The latter is a fully
diffeomorphism-invariant formulation of unimodular gravity, where full
diffeomorphism invariance is achieve... | [
{
"created": "Wed, 22 Mar 2023 18:01:13 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2023 14:10:12 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Albertini",
"Emma",
""
],
[
"Barnes",
"Kyle",
""
],
[
"Herczeg",
"Gabriel",
""
]
] | We consider a modified gravity model which we call "dynamical Henneaux-Teitelboim gravity" because of its close relationship with the Henneaux-Teitelboim formulation of unimodular gravity. The latter is a fully diffeomorphism-invariant formulation of unimodular gravity, where full diffeomorphism invariance is achieved ... |
gr-qc/9902035 | Raul Vera | Jose M M Senovilla and Raul Vera | Segre decomposition of spacetimes | 15 pages, provisionally scheduled for April 1999 in Class. Quantum
Grav | Class.Quant.Grav. 16 (1999) 1185-1196 | 10.1088/0264-9381/16/4/008 | null | gr-qc | null | Following a recent work in which it is shown that a spacetime admitting
Lie-group actions may be disjointly decomposed into a a closed subset with no
interior plus a dense finite union of open sets in each of which the character
and dimension of the group orbits as well as the Petrov type are constant, the
aim of thi... | [
{
"created": "Thu, 11 Feb 1999 16:39:02 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Senovilla",
"Jose M M",
""
],
[
"Vera",
"Raul",
""
]
] | Following a recent work in which it is shown that a spacetime admitting Lie-group actions may be disjointly decomposed into a a closed subset with no interior plus a dense finite union of open sets in each of which the character and dimension of the group orbits as well as the Petrov type are constant, the aim of this ... |
1706.04288 | V\'ictor Manuel V\'azquez-B\'aez Dr. | V. V\'azquez-B\'aez, C. Ram\'irez | Quantum cosmology of quadratic f(R) theories with a FRW metric | 6 pages, 4 figures | Advances in Mathematical Physics Volume 2017 (2017), Article ID
1056514, 5 pages | 10.1155/2017/1056514 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum cosmology of a quadratic $f(R)$ theory with a FRW
metric, via one of its equivalent Horndeski type actions, where the dynamics of
the scalar field is induced. The classical equations of motion and the
Weeler-deWitt equation, in their exact versions, are solved numerically. From
the choice of a fr... | [
{
"created": "Wed, 14 Jun 2017 00:24:43 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jun 2017 18:23:40 GMT",
"version": "v2"
}
] | 2017-06-22 | [
[
"Vázquez-Báez",
"V.",
""
],
[
"Ramírez",
"C.",
""
]
] | We study the quantum cosmology of a quadratic $f(R)$ theory with a FRW metric, via one of its equivalent Horndeski type actions, where the dynamics of the scalar field is induced. The classical equations of motion and the Weeler-deWitt equation, in their exact versions, are solved numerically. From the choice of a free... |
1109.2928 | Stephane Houndjo Dr | M. Hamani Daouda, Manuel E. Rodrigues, M. J. S. Houndjo | New Black Holes Solutions in a Modified Gravity | 15 pages, accepted for publication in ISRN Astronomy and Astrophysics | ISRN Astronomy and Astrophysics, 2011, ID 341919 (2011) | 10.5402/2011/341919 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a theory of modified gravity, inspired by the gauge theories,
where the commutator algebra of covariant derivative gives us an added term
with respect to the General Relativity, which represents the interaction of
gravity with a substratum. New spherically symmetric solutions of this theory
are obtained an... | [
{
"created": "Tue, 13 Sep 2011 21:03:50 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2011 17:00:32 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Oct 2011 15:32:24 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Dec 2011 01:00:06 GMT",
"version": "v4"
}
] | 2012-01-05 | [
[
"Daouda",
"M. Hamani",
""
],
[
"Rodrigues",
"Manuel E.",
""
],
[
"Houndjo",
"M. J. S.",
""
]
] | We present a theory of modified gravity, inspired by the gauge theories, where the commutator algebra of covariant derivative gives us an added term with respect to the General Relativity, which represents the interaction of gravity with a substratum. New spherically symmetric solutions of this theory are obtained and ... |
1911.00494 | Timothy Walton | Robin W. Tucker, Timothy J. Walton, Manuel Array\'as and Jos\'e L.
Trueba | A new paradigm for the dynamics of the early Universe | 36 pages, 5 figures | null | 10.1088/1361-6382/ab4ecc | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper invokes a new mechanism for reducing a coupled system of fields
(including Einstein's equations without a cosmological constant) to equations
that possess solutions exhibiting characteristics of immediate relevance to
current observational astronomy. Our approach is formulated as a classical
Einstein-vecto... | [
{
"created": "Sun, 3 Nov 2019 11:43:14 GMT",
"version": "v1"
}
] | 2019-11-05 | [
[
"Tucker",
"Robin W.",
""
],
[
"Walton",
"Timothy J.",
""
],
[
"Arrayás",
"Manuel",
""
],
[
"Trueba",
"José L.",
""
]
] | This paper invokes a new mechanism for reducing a coupled system of fields (including Einstein's equations without a cosmological constant) to equations that possess solutions exhibiting characteristics of immediate relevance to current observational astronomy. Our approach is formulated as a classical Einstein-vector-... |
1608.02696 | Amitabha Lahiri | Karan Fernandes, Suman Ghosh, Amitabha Lahiri | Constrained field theories on spherically symmetric spacetimes with
horizons | 23 pp | Phys. Rev. D 95, 045012 (2017) | 10.1103/PhysRevD.95.045012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the Dirac-Bergmann algorithm for the analysis of constraints to
gauge theories defined on spherically symmetric black hole backgrounds. We find
that the constraints for a given theory are modified on such spacetimes through
the presence of additional contributions from the horizon. As a concrete
example, we ... | [
{
"created": "Tue, 9 Aug 2016 05:52:48 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Dec 2016 15:45:32 GMT",
"version": "v2"
}
] | 2017-03-01 | [
[
"Fernandes",
"Karan",
""
],
[
"Ghosh",
"Suman",
""
],
[
"Lahiri",
"Amitabha",
""
]
] | We apply the Dirac-Bergmann algorithm for the analysis of constraints to gauge theories defined on spherically symmetric black hole backgrounds. We find that the constraints for a given theory are modified on such spacetimes through the presence of additional contributions from the horizon. As a concrete example, we co... |
1403.0988 | Gregory J. Galloway | Kenneth L. Baker and Gregory J. Galloway | On the topology of initial data sets with higher genus ends | v2: 13 pages, 1 figure; minor corrections and changes, Lemma 2.2
added. To appear in Commun Math Phys | null | 10.1007/s00220-015-2309-9 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we study the topology of 3-dimensional initial data sets with
horizons of a sort associated with asymptotically locally anti-de Sitter
spacetimes. We show that, within this class, those initial data sets which
contain no (immersed) marginally outer trapped surfaces in their interior must
have simple topo... | [
{
"created": "Wed, 5 Mar 2014 02:08:22 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Dec 2014 15:03:55 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Baker",
"Kenneth L.",
""
],
[
"Galloway",
"Gregory J.",
""
]
] | In this note we study the topology of 3-dimensional initial data sets with horizons of a sort associated with asymptotically locally anti-de Sitter spacetimes. We show that, within this class, those initial data sets which contain no (immersed) marginally outer trapped surfaces in their interior must have simple topolo... |
1212.4987 | Remo Garattini | Remo Garattini and Mairi Sakellariadou | Does Gravity's Rainbow induce Inflation without an Inflaton? | Published In Phys. Rev. D. Revised version with major modifications
about Gravity's Rainbow functions. RevTeX, 13 Pages | Phys. Rev. D 90, 043521 (2014) | 10.1103/PhysRevD.90.043521 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study aspects of quantum cosmology in the presence of a modified
space-time geometry. In particular, within the context of Gravity's Rainbow
modified geometry, motivated from quantum gravity corrections at the Planck
energy scale, we show that the distortion of the metric leads to a Wheeler-De
Witt equation whose ... | [
{
"created": "Thu, 20 Dec 2012 11:34:04 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Aug 2014 09:55:12 GMT",
"version": "v2"
}
] | 2014-08-21 | [
[
"Garattini",
"Remo",
""
],
[
"Sakellariadou",
"Mairi",
""
]
] | We study aspects of quantum cosmology in the presence of a modified space-time geometry. In particular, within the context of Gravity's Rainbow modified geometry, motivated from quantum gravity corrections at the Planck energy scale, we show that the distortion of the metric leads to a Wheeler-De Witt equation whose so... |
1702.02800 | Oleksandr Stashko | O. S. Stashko and V. I. Zhdanov | Spherically symmetric configurations of General Relativity in presence
of scalar field: separation of test body circular orbits | 10 pages, 9 figures | null | 10.1007/s10714-018-2425-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study test-body orbits in the gravitational field of a static spherically
symmetric object in presence of a minimally coupled nonlinear scalar field. We
generated a two-parametric family of scalar field potentials, which allow
finding solutions of Einstein's equations in an analytic form. The results are
presented... | [
{
"created": "Thu, 9 Feb 2017 12:09:35 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2017 22:32:56 GMT",
"version": "v2"
}
] | 2018-08-22 | [
[
"Stashko",
"O. S.",
""
],
[
"Zhdanov",
"V. I.",
""
]
] | We study test-body orbits in the gravitational field of a static spherically symmetric object in presence of a minimally coupled nonlinear scalar field. We generated a two-parametric family of scalar field potentials, which allow finding solutions of Einstein's equations in an analytic form. The results are presented b... |
gr-qc/0112063 | Wu Ning | Ning Wu, Germano Resconi, Zhan Xu, Zhi-Peng Zheng, Da-Hua Zhang,
Tu-Nan Ruan | Determination of Cosmological Constant from Gauge Theory of Gravity | 6 pages, no fugures, Latex File | null | null | null | gr-qc | null | Combining general relativity and gravitational gauge theory, the cosmological
constant is determined theoretically. The cosmological constant is related to
the average vacuum energy of gravitational gauge field. Because the vacuum
energy of gravitational gauge field is negative, the cosmological constant is
positive,... | [
{
"created": "Mon, 24 Dec 2001 03:29:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wu",
"Ning",
""
],
[
"Resconi",
"Germano",
""
],
[
"Xu",
"Zhan",
""
],
[
"Zheng",
"Zhi-Peng",
""
],
[
"Zhang",
"Da-Hua",
""
],
[
"Ruan",
"Tu-Nan",
""
]
] | Combining general relativity and gravitational gauge theory, the cosmological constant is determined theoretically. The cosmological constant is related to the average vacuum energy of gravitational gauge field. Because the vacuum energy of gravitational gauge field is negative, the cosmological constant is positive, w... |
1406.7514 | Rong-Jia Yang | Jun Li, Rong-Jia Yang, Bohai Chen | Discriminating dark energy models by using the statefinder hierarchy and
the growth rate of matter perturbations | 12 pages, 9 figures | JCAP12(2014)043 | 10.1088/1475-7516/2014/12/043 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the Statefinder hierarchy and the growth rate of matter
perturbations to discriminate modified Chaplygin gas (MCG), generalized
Chaplygin gas (GCG), superfluid Chaplygin gas (SCG), purely kinetic k-essence
(PKK), and $\Lambda$CDM model. We plot the evolutional trajectories of these
models in the statefinder ... | [
{
"created": "Sun, 29 Jun 2014 14:44:14 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Dec 2014 14:27:34 GMT",
"version": "v2"
}
] | 2014-12-30 | [
[
"Li",
"Jun",
""
],
[
"Yang",
"Rong-Jia",
""
],
[
"Chen",
"Bohai",
""
]
] | We apply the Statefinder hierarchy and the growth rate of matter perturbations to discriminate modified Chaplygin gas (MCG), generalized Chaplygin gas (GCG), superfluid Chaplygin gas (SCG), purely kinetic k-essence (PKK), and $\Lambda$CDM model. We plot the evolutional trajectories of these models in the statefinder pl... |
1312.2906 | Ranjan Sharma | Megan Govender, Robert Bogadi, Ranjan Sharma and Shyam Das | Gravitational collapse in spatially isotropic coordinates | Submitted for publication | Gen. Relativ. Gravit (2015) 47:25 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the dynamical nature of the collapse process of a spherically
symmetric star in quasi-static hydrodynamical equilibrium. The star collapses
from an initial static configuration by dissipating energy in the form of a
radial heat flux. The dissipation ensures that the singularity is never formed
and the ... | [
{
"created": "Mon, 9 Dec 2013 06:24:40 GMT",
"version": "v1"
}
] | 2017-11-20 | [
[
"Govender",
"Megan",
""
],
[
"Bogadi",
"Robert",
""
],
[
"Sharma",
"Ranjan",
""
],
[
"Das",
"Shyam",
""
]
] | We investigate the dynamical nature of the collapse process of a spherically symmetric star in quasi-static hydrodynamical equilibrium. The star collapses from an initial static configuration by dissipating energy in the form of a radial heat flux. The dissipation ensures that the singularity is never formed and the st... |
1409.5069 | Douglas A. Singleton | Piero Nicolini and Douglas Singleton | Connecting horizon pixels and interior voxels of a black hole | 10 pages, 0 figures, published version with note added | Phys.Lett. B738 (2014) 213-217 | 10.1016/j.physletb.2014.09.038 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we discuss to what extent one can infer details of the interior
structure of a black hole based on its horizon. Recalling that black hole
thermal properties are connected to the non-classical nature of gravity, we
circumvent the restrictions of the no hair theorem by postulating that the
black hole inte... | [
{
"created": "Wed, 17 Sep 2014 17:02:23 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 2014 19:13:20 GMT",
"version": "v2"
}
] | 2014-10-06 | [
[
"Nicolini",
"Piero",
""
],
[
"Singleton",
"Douglas",
""
]
] | In this paper we discuss to what extent one can infer details of the interior structure of a black hole based on its horizon. Recalling that black hole thermal properties are connected to the non-classical nature of gravity, we circumvent the restrictions of the no hair theorem by postulating that the black hole interi... |
2110.02489 | Panagiotis Mavrogiannis | Panagiotis Mavrogiannis and Christos G. Tsagas | How the magnetic field behaves during the motion of a highly conducting
fluid under its own gravity--A new theoretical, relativistic approach | 34 pages, minor comments added | Phys. Rev. D 104, 124053 (2021) | 10.1103/PhysRevD.104.124053 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Within the context of general relativity we study in a fully covariant way
the so-called Euler-Maxwell system of equations. In particular, on decomposing
the aforementioned system into its 1 temporal and 1 + 2 spatial components at
the ideal magnetohydrodynamic limit, we bring it in a simplified form that
favors phys... | [
{
"created": "Wed, 6 Oct 2021 03:54:12 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Dec 2021 11:25:53 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Apr 2022 15:35:35 GMT",
"version": "v3"
}
] | 2022-04-04 | [
[
"Mavrogiannis",
"Panagiotis",
""
],
[
"Tsagas",
"Christos G.",
""
]
] | Within the context of general relativity we study in a fully covariant way the so-called Euler-Maxwell system of equations. In particular, on decomposing the aforementioned system into its 1 temporal and 1 + 2 spatial components at the ideal magnetohydrodynamic limit, we bring it in a simplified form that favors physic... |
gr-qc/0011054 | Leo Brewin | Leo Brewin | Stable evolution of a maximally sliced Schwarzschild spacetime using a
smooth lattice | 3 pages, 4 eps figures, talk given at MG9, Rome, July 2000 | null | null | null | gr-qc | null | We will present results of a long term stable evolution, to $t=1000m$, of a
maximally sliced Schwarzschild blackhole using a smooth lattice method.
| [
{
"created": "Wed, 15 Nov 2000 14:12:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brewin",
"Leo",
""
]
] | We will present results of a long term stable evolution, to $t=1000m$, of a maximally sliced Schwarzschild blackhole using a smooth lattice method. |
1001.5380 | Antoine Petiteau | Antoine Petiteau, Yu Shang, Stanislav Babak and Farhan Feroz | The search for spinning black hole binaries in mock LISA data using a
genetic algorithm | 25 pages, 9 figures | Phys.Rev.D81:104016,2010 | 10.1103/PhysRevD.81.104016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coalescing massive Black Hole binaries are the strongest and probably the
most important gravitational wave sources in the LISA band. The spin and
orbital precessions bring complexity in the waveform and make the likelihood
surface richer in structure as compared to the non-spinning case. We introduce
an extended mul... | [
{
"created": "Fri, 29 Jan 2010 11:05:03 GMT",
"version": "v1"
}
] | 2010-05-25 | [
[
"Petiteau",
"Antoine",
""
],
[
"Shang",
"Yu",
""
],
[
"Babak",
"Stanislav",
""
],
[
"Feroz",
"Farhan",
""
]
] | Coalescing massive Black Hole binaries are the strongest and probably the most important gravitational wave sources in the LISA band. The spin and orbital precessions bring complexity in the waveform and make the likelihood surface richer in structure as compared to the non-spinning case. We introduce an extended multi... |
2006.08027 | Sergey Yu. Vernov | Ekaterina O. Pozdeeva, Mayukh Raj Gangopadhyay, Mohammad Sami, Alexey
V. Toporensky, Sergey Yu. Vernov | Inflation with a quartic potential in the framework of
Einstein-Gauss-Bonnet gravity | 17 pages, 5 figures, references and comments are added, revised
version to appear in Phys. Rev. D | Phys. Rev. D 102, 043525 (2020) | 10.1103/PhysRevD.102.043525 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate inflationary dynamics in the framework of the
Einstein-Gauss-Bonnet gravity. In the model under consideration, the inflaton
field is non-minimally coupled to the Gauss-Bonnet curvature invariant, so that
the latter appears to be dynamically important. We consider a quartic potential
for the inflaton fi... | [
{
"created": "Sun, 14 Jun 2020 21:27:50 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Aug 2020 19:27:24 GMT",
"version": "v2"
}
] | 2020-09-02 | [
[
"Pozdeeva",
"Ekaterina O.",
""
],
[
"Gangopadhyay",
"Mayukh Raj",
""
],
[
"Sami",
"Mohammad",
""
],
[
"Toporensky",
"Alexey V.",
""
],
[
"Vernov",
"Sergey Yu.",
""
]
] | We investigate inflationary dynamics in the framework of the Einstein-Gauss-Bonnet gravity. In the model under consideration, the inflaton field is non-minimally coupled to the Gauss-Bonnet curvature invariant, so that the latter appears to be dynamically important. We consider a quartic potential for the inflaton fiel... |
2101.11467 | Marcelo Byrro Ribeiro | Osvaldo L. Santos-Pereira (1), Everton M. C. Abreu (2,3,4), Marcelo B.
Ribeiro (1,4,5) ((1) Physics Institute, Universidade Federal do Rio de
Janeiro, (2) Physics Department, Universidade Federal Rural do Rio de
Janeiro, (3) Physics Department, Universidade Federal de Juiz de Fora, (4)
Applied Physics Graduate ... | Fluid dynamics in the warp drive spacetime geometry | 39 pages, 3 tables. LaTeX. Minor changes to match proofs. Accepted
for publication in the European Physical Journal C | Eur. Phys. J. C 81(2021)133 | 10.1140/epjc/s10052-021-08921-3 | null | gr-qc physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | The Alcubierre warp drive metric is a spacetime geometry featuring a
spacetime distortion, called warp bubble, where a massive particle inside it
acquires global superluminal velocities, or warp speeds. This work presents
solutions of the Einstein equations for the Alcubierre metric having fluid
matter as gravity sou... | [
{
"created": "Wed, 27 Jan 2021 14:55:53 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2021 03:13:36 GMT",
"version": "v2"
}
] | 2021-02-10 | [
[
"Santos-Pereira",
"Osvaldo L.",
""
],
[
"Abreu",
"Everton M. C.",
""
],
[
"Ribeiro",
"Marcelo B.",
""
]
] | The Alcubierre warp drive metric is a spacetime geometry featuring a spacetime distortion, called warp bubble, where a massive particle inside it acquires global superluminal velocities, or warp speeds. This work presents solutions of the Einstein equations for the Alcubierre metric having fluid matter as gravity sourc... |
gr-qc/0604035 | Carsten Gundlach | Carsten Gundlach, Jose M. Martin-Garcia | Well-posedness of formulations of the Einstein equations with dynamical
lapse and shift conditions | null | Phys.Rev.D74:024016,2006 | 10.1103/PhysRevD.74.024016 | null | gr-qc | null | We prove that when the equations are restricted to the principal part the
standard version of the BSSN formulation of the Einstein equations is
equivalent to the NOR formulation for any gauge, and that the KST formulation
is equivalent to NOR for a variety of gauges. We review a family of elliptic
gauge conditions an... | [
{
"created": "Sat, 8 Apr 2006 14:47:21 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2006 18:35:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gundlach",
"Carsten",
""
],
[
"Martin-Garcia",
"Jose M.",
""
]
] | We prove that when the equations are restricted to the principal part the standard version of the BSSN formulation of the Einstein equations is equivalent to the NOR formulation for any gauge, and that the KST formulation is equivalent to NOR for a variety of gauges. We review a family of elliptic gauge conditions and ... |
0806.2423 | Vojt\v{e}ch Pravda | Alena Pravdova, Vojtech Pravda | Newman-Penrose formalism in higher dimensions: vacuum spacetimes with a
non-twisting geodetic multiple Weyl aligned null direction | 25 pages, version to be published in Class. Quantum Grav. (expanded
-background material included, 3 references added, small change in notation) | Class.Quant.Grav.25:235008,2008 | 10.1088/0264-9381/25/23/235008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vacuum spacetimes admitting a non-twisting geodetic multiple Weyl aligned
null direction (WAND) are analyzed in arbitrary dimension using recently
developed higher-dimensional Newman-Penrose (NP) formalism. We determine
dependence of the metric and of the Weyl tensor on the affine parameter r along
null geodesics gen... | [
{
"created": "Sun, 15 Jun 2008 07:37:11 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Nov 2008 20:10:23 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Pravdova",
"Alena",
""
],
[
"Pravda",
"Vojtech",
""
]
] | Vacuum spacetimes admitting a non-twisting geodetic multiple Weyl aligned null direction (WAND) are analyzed in arbitrary dimension using recently developed higher-dimensional Newman-Penrose (NP) formalism. We determine dependence of the metric and of the Weyl tensor on the affine parameter r along null geodesics gener... |
gr-qc/9310036 | Dr. Norman J. LaFave | Norman J. LaFave | A Step Toward Pregeometry I.: Ponzano-Regge Spin Networks and the Origin
of Spacetime Structure in Four Dimensions | 57 pages + 20 shar'ed, uuencoded, compressed eps figures, no local
preprint number | null | null | null | gr-qc hep-lat hep-th | null | In this paper, a candidate for pregeometry, Ponzano-Regge spin networks, will
be examined in the context of the pregeometric philosophy of Wheeler. Ponzano
and Regge were able to construct a theory for 3-dimensional quantum gravity
based on 3nj-symbols, obtaining the path integral over the metric in the
semiclassical... | [
{
"created": "Tue, 26 Oct 1993 19:38:00 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Oct 1993 20:16:00 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Oct 1993 20:27:00 GMT",
"version": "v3"
}
] | 2009-09-25 | [
[
"LaFave",
"Norman J.",
""
]
] | In this paper, a candidate for pregeometry, Ponzano-Regge spin networks, will be examined in the context of the pregeometric philosophy of Wheeler. Ponzano and Regge were able to construct a theory for 3-dimensional quantum gravity based on 3nj-symbols, obtaining the path integral over the metric in the semiclassical l... |
2312.09640 | Venkatesha Venkatesha | Chaitra Chooda Chalavadi, V. Venkatesha, N. S. Kavya, and S. V. Divya
Rashmi | Conformally symmetric wormhole solutions supported by non-commutative
geometry in $f(Q,T)$ gravity | Accepted version in Communications in Theoretical Physics | null | 10.1088/1572-9494/ad15fa | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | This manuscript investigates wormhole solutions within the framework of
extended symmetric teleparallel gravity, incorporating non-commutative
geometry, and conformal symmetries. To achieve this, we examine the linear
wormhole model with anisotropic fluid under Gaussian and Lorentzian
distributions. The primary objec... | [
{
"created": "Fri, 15 Dec 2023 09:29:30 GMT",
"version": "v1"
}
] | 2023-12-18 | [
[
"Chalavadi",
"Chaitra Chooda",
""
],
[
"Venkatesha",
"V.",
""
],
[
"Kavya",
"N. S.",
""
],
[
"Rashmi",
"S. V. Divya",
""
]
] | This manuscript investigates wormhole solutions within the framework of extended symmetric teleparallel gravity, incorporating non-commutative geometry, and conformal symmetries. To achieve this, we examine the linear wormhole model with anisotropic fluid under Gaussian and Lorentzian distributions. The primary objecti... |
1501.01619 | Matt Visser | Matt Visser | Energy conditions in the epoch of galaxy formation | Old article from 1997; somewhat tricky to access online; 5 pages in
preprint form. arXiv admin note: text overlap with arXiv:gr-qc/9705070 | Science 276 (1997) 88-90 | 10.1126/science.276.5309.88 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The energy conditions of Einstein gravity (classical general relativity) do
not require one to fix a specific equation of state. In a
Friedmann-Robertson-Walker universe where the equation of state for the
cosmological fluid is uncertain, the energy conditions provide simple,
model-independent, and robust bounds on t... | [
{
"created": "Wed, 7 Jan 2015 20:48:01 GMT",
"version": "v1"
}
] | 2015-01-08 | [
[
"Visser",
"Matt",
""
]
] | The energy conditions of Einstein gravity (classical general relativity) do not require one to fix a specific equation of state. In a Friedmann-Robertson-Walker universe where the equation of state for the cosmological fluid is uncertain, the energy conditions provide simple, model-independent, and robust bounds on the... |
gr-qc/9706075 | Nils Andersson | Nils Andersson | A new class of unstable modes of rotating relativistic stars | 14 pages, latex | Astrophys.J.502:708-713,1998 | 10.1086/305919 | null | gr-qc astro-ph | null | The first numerical study of axial (toroidal) pulsation modes of a slowly
rotating relativistic star is presented. The calculation includes terms of
first order in $\epsilon \equiv \Omega \sqrt{R^3/M}<<1$ ($R$ is the radius, $M$
is the mass and $\Omega$ is the rotation frequency of the star), and accounts
for effects... | [
{
"created": "Tue, 24 Jun 1997 13:52:12 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Andersson",
"Nils",
""
]
] | The first numerical study of axial (toroidal) pulsation modes of a slowly rotating relativistic star is presented. The calculation includes terms of first order in $\epsilon \equiv \Omega \sqrt{R^3/M}<<1$ ($R$ is the radius, $M$ is the mass and $\Omega$ is the rotation frequency of the star), and accounts for effects d... |
1304.5995 | Jorge Ovalle | J Ovalle, F Linares, A Pasqua and A Sotomayor | The role of exterior Weyl fluids on compact stellar structures in
Randall-Sundrum gravity | 14 pages, 1 figure. References added. Final version to appear in CQG | Class. Quantum Grav. 30 (2013) 175019, | 10.1088/0264-9381/30/17/175019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the Randall-Sundrum braneworld, the minimal geometric
deformation approach (MGD) is used to generate a new physically acceptable
interior solution to Einstein's field equations for a spherically symmetric
compact distribution. This new solution is used to elucidate the role of
exterior Weyl stresses... | [
{
"created": "Mon, 22 Apr 2013 15:54:52 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jul 2013 16:47:13 GMT",
"version": "v2"
}
] | 2013-11-21 | [
[
"Ovalle",
"J",
""
],
[
"Linares",
"F",
""
],
[
"Pasqua",
"A",
""
],
[
"Sotomayor",
"A",
""
]
] | In the context of the Randall-Sundrum braneworld, the minimal geometric deformation approach (MGD) is used to generate a new physically acceptable interior solution to Einstein's field equations for a spherically symmetric compact distribution. This new solution is used to elucidate the role of exterior Weyl stresses f... |
2208.09737 | Yisong Yang Professor | Yisong Yang | Dyonic Matter Equations, Exact Point-Source Solutions, and Charged Black
Holes in Generalized Born--Infeld Theory | 38 pages, 1 figure | Physical Review D 107 (2023) 085007 | 10.1103/PhysRevD.107.085007 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the equations of motion governing static dyonic matters, described
in terms of two real scalar fields, in nonlinear electrodynamics of the
Born--Infeld theory type. We then obtain exact finite-energy solutions of these
equations in the quadratic and logarithmic nonlinearity cases subject to dyonic
point-cha... | [
{
"created": "Sat, 20 Aug 2022 19:50:33 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Sep 2022 13:18:16 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Oct 2022 15:04:11 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Dec 2022 19:36:03 GMT",
"version": "v4"
},
{
"cr... | 2023-04-19 | [
[
"Yang",
"Yisong",
""
]
] | We derive the equations of motion governing static dyonic matters, described in terms of two real scalar fields, in nonlinear electrodynamics of the Born--Infeld theory type. We then obtain exact finite-energy solutions of these equations in the quadratic and logarithmic nonlinearity cases subject to dyonic point-charg... |
1109.3996 | Paolo Pani | Paolo Pani, Caio F. B. Macedo, Luis C. B. Crispino, Vitor Cardoso | Slowly rotating black holes in alternative theories of gravity | 5 pages, no figures. v2: references added and one minor correction in
the discussion. Published in PRD as Brief Report | null | 10.1103/PhysRevD.84.087501 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present, in closed analytic form, a general stationary, slowly rotating
black hole, which is solution to a large class of alternative theories of
gravity in four dimensions. In these theories, the Einstein-Hilbert action is
supplemented by all possible quadratic, algebraic curvature invariants coupled
to a scalar ... | [
{
"created": "Mon, 19 Sep 2011 11:10:49 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2011 08:39:47 GMT",
"version": "v2"
}
] | 2011-10-27 | [
[
"Pani",
"Paolo",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"Crispino",
"Luis C. B.",
""
],
[
"Cardoso",
"Vitor",
""
]
] | We present, in closed analytic form, a general stationary, slowly rotating black hole, which is solution to a large class of alternative theories of gravity in four dimensions. In these theories, the Einstein-Hilbert action is supplemented by all possible quadratic, algebraic curvature invariants coupled to a scalar fi... |
1506.04749 | Sebastian Steinhaus | Sebastian Steinhaus | Coupled intertwiner dynamics: A toy model for coupling matter to spin
foam models | 31 + 6 pages, 8 figures, 7 tables, v2: minor mistakes corrected,
references and acknowledgements updated. Matches accepted version in Phys.
Rev. D, v3: Title matching published version and added PACS numbers | Phys. Rev. D 92, 064007 (2015) | 10.1103/PhysRevD.92.064007 | null | gr-qc cond-mat.str-el hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The universal coupling of matter and gravity is one of the most important
features of general relativity. In quantum gravity, in particular spin foams,
matter couplings have been defined in the past, yet the mutual dynamics, in
particular if matter and gravity are strongly coupled, are hardly explored,
which is relat... | [
{
"created": "Mon, 15 Jun 2015 20:00:42 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2015 12:04:42 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Sep 2015 08:24:01 GMT",
"version": "v3"
}
] | 2015-09-18 | [
[
"Steinhaus",
"Sebastian",
""
]
] | The universal coupling of matter and gravity is one of the most important features of general relativity. In quantum gravity, in particular spin foams, matter couplings have been defined in the past, yet the mutual dynamics, in particular if matter and gravity are strongly coupled, are hardly explored, which is related... |
0901.0814 | Eugenio R. Bezerra de Mello | T. R. P. Caram\^es and E. R. Bezerra de Mello | Spherically symmetric vacuum solutions of modified gravity theory in
higher dimensions | 14 pages, no figure. New version accepted for publication in EPJC | Eur.Phys.J.C64:113-121,2009 | 10.1140/epjc/s10052-009-1115-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate spherically symmetric vacuum solutions of $f(R)$
gravity in a higher dimensional spacetime. With this objective we construct a
system of non-linear differential equations, whose solutions depend on the
explicit form assumed for the function $F(R)=\frac{df(R)}{dR}$. We explicit
show that f... | [
{
"created": "Wed, 7 Jan 2009 12:26:10 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2009 11:35:31 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Caramês",
"T. R. P.",
""
],
[
"de Mello",
"E. R. Bezerra",
""
]
] | In this paper we investigate spherically symmetric vacuum solutions of $f(R)$ gravity in a higher dimensional spacetime. With this objective we construct a system of non-linear differential equations, whose solutions depend on the explicit form assumed for the function $F(R)=\frac{df(R)}{dR}$. We explicit show that for... |
gr-qc/0601115 | Yun-Song Piao | Yun-Song Piao | Gravitational Wave Background from Phantom Superinflation | 3 pages, 2 eps figures, to be published in PRD, revised with
published version, refs. added | Phys.Rev. D73 (2006) 047302 | 10.1103/PhysRevD.73.047302 | null | gr-qc | null | Recently, the early superinflation driven by phantom field has been proposed
and studied. The detection of primordial gravitational wave is an important
means to know the state of very early universe. In this brief report we discuss
in detail the gravitational wave background excited during the phantom
superinflation... | [
{
"created": "Fri, 27 Jan 2006 03:35:34 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2006 05:10:43 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Piao",
"Yun-Song",
""
]
] | Recently, the early superinflation driven by phantom field has been proposed and studied. The detection of primordial gravitational wave is an important means to know the state of very early universe. In this brief report we discuss in detail the gravitational wave background excited during the phantom superinflation. |
1704.02593 | Fatemeh Oboudiat | Behrouz Mirza, Fatemeh Oboudiat | Constraining f(T) gravity by dynamical system analysis | 11 pages | JCAP11(2017)011 | 10.1088/1475-7516/2017/11/011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmological solutions of the $f(T)$ gravity theory using
the method of dynamical systems. For this purpose a general form of the $f(T)$
function is considered and four conditions are defined that they have to
satisfy in order to describe the standard cosmological history. We examine the
power law,... | [
{
"created": "Sun, 9 Apr 2017 12:38:06 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Dec 2017 09:04:33 GMT",
"version": "v2"
}
] | 2017-12-12 | [
[
"Mirza",
"Behrouz",
""
],
[
"Oboudiat",
"Fatemeh",
""
]
] | We investigate the cosmological solutions of the $f(T)$ gravity theory using the method of dynamical systems. For this purpose a general form of the $f(T)$ function is considered and four conditions are defined that they have to satisfy in order to describe the standard cosmological history. We examine the power law, a... |
2309.06093 | Titus K Mathew | Vishnu A Pai and Titus K Mathew | Bulk viscous late acceleration under near equilibrium conditions in f(R,
T) gravity with mixed matter | 26 pages, 14 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | Various studies have shown that the late acceleration of the universe can be
caused by the bulk viscosity associated with dark matter. But recently, it was
indicated that a cosmological constant is essential for maintaining Near
Equilibrium Conditions (NEC) for the bulk viscous matter during the accelerated
expansion... | [
{
"created": "Tue, 12 Sep 2023 09:52:13 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 2023 18:14:36 GMT",
"version": "v2"
}
] | 2023-11-10 | [
[
"Pai",
"Vishnu A",
""
],
[
"Mathew",
"Titus K",
""
]
] | Various studies have shown that the late acceleration of the universe can be caused by the bulk viscosity associated with dark matter. But recently, it was indicated that a cosmological constant is essential for maintaining Near Equilibrium Conditions (NEC) for the bulk viscous matter during the accelerated expansion o... |
1202.3558 | Takashi Uchiyama | Takashi Uchiyama, Shinji Miyoki, Souichi Telada, Kazuhiro Yamamoto,
Masatake Ohashi, Kazuhiro Agatsuma, Koji Arai, Masa-Katsu Fujimoto, Tomiyoshi
Haruyama, Seiji Kawamura, Osamu Miyakawa, Naoko Ohishi, Takanori Saito,
Takakazu Shintomi, Toshikazu Suzuki, Ryutaro Takahashi, Daisuke Tatsumi | Reduction of thermal fluctuations in a cryogenic laser interferometric
gravitational wave detector | Accepted for publication in Physical Review Letters, 5 pages, 2
figures | null | 10.1103/PhysRevLett.108.141101 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermal fluctuation of mirror surfaces is the fundamental limitation for
interferometric gravitational wave (GW) detectors. Here, we experimentally
demonstrate for the first time a reduction in a mirror's thermal fluctuation in
a GW detector with sapphire mirrors from the Cryogenic Laser Interferometer
Observator... | [
{
"created": "Thu, 16 Feb 2012 10:50:16 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Uchiyama",
"Takashi",
""
],
[
"Miyoki",
"Shinji",
""
],
[
"Telada",
"Souichi",
""
],
[
"Yamamoto",
"Kazuhiro",
""
],
[
"Ohashi",
"Masatake",
""
],
[
"Agatsuma",
"Kazuhiro",
""
],
[
"Arai",
"Koji",
""
],
... | The thermal fluctuation of mirror surfaces is the fundamental limitation for interferometric gravitational wave (GW) detectors. Here, we experimentally demonstrate for the first time a reduction in a mirror's thermal fluctuation in a GW detector with sapphire mirrors from the Cryogenic Laser Interferometer Observatory ... |
2305.01331 | Albert Munyeshyaka Mr | Albert Munyeshyaka, Joseph Ntahompagaze, Tom Mutabazi and Manasse.R
Mbonye | On 1 + 3 covariant perturbations of the quasi-Newtonian space-time in
modified Gauss-Bonnet gravity | This manuscript is accepted for publication in the International
Journal of Modern Physics D(IJMPD). 28 pages, 9 figures | null | 10.1142/S0218271823500530 | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | The consideration of a 1 + 3 covariant approach to cold dark matter universe
with no shear cosmological dust model with irrotational flows is developed in
the context of f (G) gravity theory in the present study. This approach reveals
the existence of integrability conditions which do not appear in non-covariant
trea... | [
{
"created": "Tue, 2 May 2023 11:27:05 GMT",
"version": "v1"
}
] | 2023-05-19 | [
[
"Munyeshyaka",
"Albert",
""
],
[
"Ntahompagaze",
"Joseph",
""
],
[
"Mutabazi",
"Tom",
""
],
[
"Mbonye",
"Manasse. R",
""
]
] | The consideration of a 1 + 3 covariant approach to cold dark matter universe with no shear cosmological dust model with irrotational flows is developed in the context of f (G) gravity theory in the present study. This approach reveals the existence of integrability conditions which do not appear in non-covariant treatm... |
1805.09810 | Joan Sola | Joan Sola | Brans-Dicke gravity: from Higgs physics to (dynamical) dark energy | Version accepted for publication in Int. J. of Mod. Phys. D. This
essay received an Honorable Mention from the Gravity Research Foundation
Awards Essays on Gravitation (2018). Extended presentation, references added,
typos corrected | Int.J.Mod.Phys. D27 (2018) no.14, 1847029 | 10.1142/S0218271818470296 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs mechanism is one of the central pieces of the Standard Model of
electroweak interactions and thanks to it we can generate the masses of the
elementary particles. Its fundamental origin is nonetheless unknown.
Furthermore, in order to preserve renormalizability we have to break the gauge
symmetry spontaneous... | [
{
"created": "Thu, 24 May 2018 17:53:34 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2018 17:16:11 GMT",
"version": "v2"
},
{
"created": "Thu, 31 May 2018 17:58:45 GMT",
"version": "v3"
},
{
"created": "Wed, 31 Oct 2018 19:14:14 GMT",
"version": "v4"
}
] | 2018-12-04 | [
[
"Sola",
"Joan",
""
]
] | The Higgs mechanism is one of the central pieces of the Standard Model of electroweak interactions and thanks to it we can generate the masses of the elementary particles. Its fundamental origin is nonetheless unknown. Furthermore, in order to preserve renormalizability we have to break the gauge symmetry spontaneously... |
2105.07150 | Saurya Das | Saurya Das, Sourav Sur | Emergent gravity and the quantum | This essay received an Honorable Mention in the 2021 Gravity Research
Foundation Essay Competition | null | 10.1142/S021827182142030X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that if one starts with a Universe with some matter and a
cosmological constant, then quantum mechanics naturally induces an attractive
gravitational potential and an effective Newton's coupling. Thus gravity is an
emergent phenomenon and what should be quantized are the fundamental degrees of
freedom from wh... | [
{
"created": "Sat, 15 May 2021 06:19:22 GMT",
"version": "v1"
}
] | 2022-01-26 | [
[
"Das",
"Saurya",
""
],
[
"Sur",
"Sourav",
""
]
] | We show that if one starts with a Universe with some matter and a cosmological constant, then quantum mechanics naturally induces an attractive gravitational potential and an effective Newton's coupling. Thus gravity is an emergent phenomenon and what should be quantized are the fundamental degrees of freedom from whic... |
gr-qc/0309029 | Sergio M. C. V. Goncalves | Sergio M. C. V. Goncalves | Global symmetries: matter from geometry, hoop conjecture, and cosmic
censorship | 6 pages, revtex4; slightly modified version of an essay submitted to
the Gravity Research Foundation Competition; references updated | null | null | null | gr-qc | null | We show that four-dimensional Lorentzian metrics admitting a global spacelike
Lie group of isometries, $G_{1}={\mathbb R}$, which obey the Einstein equations
for vacuum and certain types of matter, cannot contain apparent horizons. The
assumed global isometry allows for the dimensional reduction of the (3+1)
system t... | [
{
"created": "Thu, 4 Sep 2003 19:51:26 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2003 20:05:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Goncalves",
"Sergio M. C. V.",
""
]
] | We show that four-dimensional Lorentzian metrics admitting a global spacelike Lie group of isometries, $G_{1}={\mathbb R}$, which obey the Einstein equations for vacuum and certain types of matter, cannot contain apparent horizons. The assumed global isometry allows for the dimensional reduction of the (3+1) system to ... |
1904.09997 | Carlos A. R. Herdeiro | Pedro V. P. Cunha, Carlos A. R. Herdeiro, Eugen Radu | Spontaneously scalarised Kerr black holes | 6 pages, 6 figures | Phys. Rev. Lett. 123, 011101 (2019) | 10.1103/PhysRevLett.123.011101 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct asymptotically flat, spinning, regular on and outside an event
horizon, scalarised black holes (SBHs) in extended scalar-tensor-Gauss-Bonnet
models. They reduce to Kerr BHs when the scalar field vanishes. For an
illustrative choice of non-minimal coupling, we scan the domain of existence.
For each value ... | [
{
"created": "Mon, 22 Apr 2019 18:00:03 GMT",
"version": "v1"
}
] | 2019-07-10 | [
[
"Cunha",
"Pedro V. P.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Radu",
"Eugen",
""
]
] | We construct asymptotically flat, spinning, regular on and outside an event horizon, scalarised black holes (SBHs) in extended scalar-tensor-Gauss-Bonnet models. They reduce to Kerr BHs when the scalar field vanishes. For an illustrative choice of non-minimal coupling, we scan the domain of existence. For each value of... |
gr-qc/0407047 | Lorenzo Iorio | Lorenzo Iorio | Is it possible to measure the Lense-Thirring effect on the orbits of the
planets in the gravitational field of the Sun? | LaTex2e, A&A macros, 6 pages, no figure, 3 tables. Substantial
revision. More realistic conclusions. Estimations of the impact of
BepiColombo presented | Astron.Astrophys.431:385-389,2005 | 10.1051/0004-6361:20041646 | null | gr-qc astro-ph | null | Here we explore a novel approach in order to try to measure the
post-Newtonian 1/c^2 Lense-Thirring secular effect induced by the
gravitomagnetic field of the Sun on the planetary orbital motion. Due to the
relative smallness of the solar angular momentum J and the large values of the
planetary semimajor axes a, the ... | [
{
"created": "Tue, 13 Jul 2004 13:20:25 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jul 2004 20:17:03 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Aug 2004 14:36:53 GMT",
"version": "v3"
},
{
"created": "Sat, 21 Aug 2004 09:39:35 GMT",
"version": "v4"
},
{
"c... | 2011-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | Here we explore a novel approach in order to try to measure the post-Newtonian 1/c^2 Lense-Thirring secular effect induced by the gravitomagnetic field of the Sun on the planetary orbital motion. Due to the relative smallness of the solar angular momentum J and the large values of the planetary semimajor axes a, the gr... |
0902.1863 | Farhad Darabi | F. Darabi | Classical and Quantum Cosmology of an Accelerating Model Universe with
Compactification of Extra Dimensions | 20 pages, "Trends in General Relativity and Quantum Cosmology"
Editor: Charles V. Benton, Nova Science Publishers, New York (2006) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a $(4+D)$-dimensional Kaluza-Klein cosmology with a Robertson-Walker
type metric having two scale factors $a$ and $R$, corresponding to
$D$-dimensional internal space and 4-dimensional universe, respectively. By
introducing an exotic matter in the form of perfect fluid with an special
equation of state, as t... | [
{
"created": "Wed, 11 Feb 2009 12:31:22 GMT",
"version": "v1"
}
] | 2009-02-12 | [
[
"Darabi",
"F.",
""
]
] | We study a $(4+D)$-dimensional Kaluza-Klein cosmology with a Robertson-Walker type metric having two scale factors $a$ and $R$, corresponding to $D$-dimensional internal space and 4-dimensional universe, respectively. By introducing an exotic matter in the form of perfect fluid with an special equation of state, as the... |
gr-qc/9505049 | Christian Wiesendanger | C. Wiesendanger | Poincare gauge invariance and gravitation in Minkowski spacetime | 36 pages, latex-file | Class.Quant.Grav. 13 (1996) 681-700 | 10.1088/0264-9381/13/4/008 | DIAS-STP-95-18 | gr-qc | null | A formulation of Poincare symmetry as an inner symmetry of field theories
defined on a fixed Minkowski spacetime is given. Local P gauge transformations
and the corresponding covariant derivative with P gauge fields are introduced.
The renormalization properties of scalar, spinor and vector fields in P gauge
field ba... | [
{
"created": "Tue, 30 May 1995 12:30:49 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Wiesendanger",
"C.",
""
]
] | A formulation of Poincare symmetry as an inner symmetry of field theories defined on a fixed Minkowski spacetime is given. Local P gauge transformations and the corresponding covariant derivative with P gauge fields are introduced. The renormalization properties of scalar, spinor and vector fields in P gauge field back... |
1609.06803 | J\"org Hennig | J\"org Frauendiener and J\"org Hennig | Fully pseudospectral solution of the conformally invariant wave equation
near the cylinder at spacelike infinity. II: Schwarzschild background | 25 pages, 7 figures | Class. Quantum Grav. 34, 045005 (2017) | 10.1088/1361-6382/aa54c4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been demonstrated (Class. Quantum Grav. 31, 085010, 2014)
that the conformally invariant wave equation on a Minkowski background can be
solved with a fully pseudospectral numerical method. In particular, it is
possible to include spacelike infinity into the numerical domain, which is
appropriately rep... | [
{
"created": "Thu, 22 Sep 2016 02:48:03 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2017 19:58:14 GMT",
"version": "v2"
}
] | 2017-01-26 | [
[
"Frauendiener",
"Jörg",
""
],
[
"Hennig",
"Jörg",
""
]
] | It has recently been demonstrated (Class. Quantum Grav. 31, 085010, 2014) that the conformally invariant wave equation on a Minkowski background can be solved with a fully pseudospectral numerical method. In particular, it is possible to include spacelike infinity into the numerical domain, which is appropriately repre... |
gr-qc/0105071 | Robert D. Klauber | Robert D. Klauber | Physical Components, Coordinate Components, and the Speed of Light | 10 pages including 4 figures, references | null | null | null | gr-qc | null | For generalized coordinate systems, the numerical values of vector and tensor
components do not generally equal the physical values, i.e., the values one
would measure with standard physical instruments. Hence, calculating physical
components from coordinate components is important for comparing experiment
with theor... | [
{
"created": "Fri, 18 May 2001 22:23:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Klauber",
"Robert D.",
""
]
] | For generalized coordinate systems, the numerical values of vector and tensor components do not generally equal the physical values, i.e., the values one would measure with standard physical instruments. Hence, calculating physical components from coordinate components is important for comparing experiment with theory.... |
1903.09704 | Ulrich Sperhake | Roxana Rosca-Mead, Christopher J Moore, Michalis Agathos, Ulrich
Sperhake | Inverse-chirp signals and spontaneous scalarisation with
self-interacting potentials in stellar collapse | 15 pages, 5 figures; submitted to CQG | null | 10.1088/1361-6382/ab256f | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how the gravitational wave signal from stellar collapse in
scalar-tensor gravity varies under the influence of scalar self-interaction. To
this end, we extract the gravitational radiation from numerical simulations of
stellar collapse for a range of potentials with higher-order terms in addition
to the quadr... | [
{
"created": "Fri, 22 Mar 2019 20:39:51 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Rosca-Mead",
"Roxana",
""
],
[
"Moore",
"Christopher J",
""
],
[
"Agathos",
"Michalis",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | We study how the gravitational wave signal from stellar collapse in scalar-tensor gravity varies under the influence of scalar self-interaction. To this end, we extract the gravitational radiation from numerical simulations of stellar collapse for a range of potentials with higher-order terms in addition to the quadrat... |
2110.06667 | Arash Hajibarat | Arash Hajibarat, Behrouz Mirza, and Alireza Azizallahi | $\gamma$-Metrics in Higher Dimensions | 9 pages, 1 figure | Nuclear Physics B 978 (2022) 115739 | 10.1016/j.nuclphysb.2022.115739 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce five and higher dimensional $\gamma$-metrics. The higher
dimensional metrics are exact solutions of the vacuum field equations and
represent new types of singularities. For dimensions $d>5$ we have obtained
$\gamma$-metrics in flat coordinates. We obtain singularities of metrics and
for a better understa... | [
{
"created": "Wed, 13 Oct 2021 12:05:49 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Apr 2022 08:26:38 GMT",
"version": "v2"
}
] | 2022-04-12 | [
[
"Hajibarat",
"Arash",
""
],
[
"Mirza",
"Behrouz",
""
],
[
"Azizallahi",
"Alireza",
""
]
] | We introduce five and higher dimensional $\gamma$-metrics. The higher dimensional metrics are exact solutions of the vacuum field equations and represent new types of singularities. For dimensions $d>5$ we have obtained $\gamma$-metrics in flat coordinates. We obtain singularities of metrics and for a better understand... |
2011.12714 | Andrew Farley | Andrew Farley | The Hyperbolic Bloch Equations of General Relativity | 23 pages, no figures. This version 2 includes corrections,
clarifications and additional non-Hermitian Hamiltonian and underlying Lie
group discussions | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New equations are derived which describe the evolution in curved spacetime of
null geodesics with non-zero (complex) shear $\sigma$ and twist $\omega$ rates
resembling Grishchuk's squeezed states evolution equations from inflationary
cosmology. A ``squeeze" angle $\phi$ (obtained from the direction of the major
axis ... | [
{
"created": "Mon, 23 Nov 2020 20:52:32 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 16:39:04 GMT",
"version": "v2"
}
] | 2021-04-20 | [
[
"Farley",
"Andrew",
""
]
] | New equations are derived which describe the evolution in curved spacetime of null geodesics with non-zero (complex) shear $\sigma$ and twist $\omega$ rates resembling Grishchuk's squeezed states evolution equations from inflationary cosmology. A ``squeeze" angle $\phi$ (obtained from the direction of the major axis of... |
1808.07490 | Vijay Varma | Vijay Varma and Mark A. Scheel | Constructing a boosted, spinning black hole in the damped harmonic gauge | Matches PRD version. 8 pages, 3 figures | Phys. Rev. D 98, 084032 (2018) | 10.1103/PhysRevD.98.084032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The damped harmonic gauge is important for numerical relativity computations
based on the generalized harmonic formulation of Einstein's equations, and is
used to reduce coordinate distortions near binary black hole mergers. However,
currently there is no prescription to construct quasiequilibrium binary black
hole i... | [
{
"created": "Wed, 22 Aug 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2018 04:13:33 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Nov 2018 22:53:24 GMT",
"version": "v3"
}
] | 2018-11-15 | [
[
"Varma",
"Vijay",
""
],
[
"Scheel",
"Mark A.",
""
]
] | The damped harmonic gauge is important for numerical relativity computations based on the generalized harmonic formulation of Einstein's equations, and is used to reduce coordinate distortions near binary black hole mergers. However, currently there is no prescription to construct quasiequilibrium binary black hole ini... |
1403.6177 | Anna Heffernan | Anna Heffernan | The Self-Force Problem: Local Behaviour of the Detweiler-Whiting
Singular Field | PhD Thesis | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The growing reality of gravitational wave astronomy is giving age-old
problems a new lease of life; one such problem is that of the self-force. A
charged or massive particle moving in a curved background space-time produces a
field that affects its motion, pushing it off its expected geodesic. This
self-field gives r... | [
{
"created": "Mon, 24 Mar 2014 22:51:19 GMT",
"version": "v1"
}
] | 2014-03-26 | [
[
"Heffernan",
"Anna",
""
]
] | The growing reality of gravitational wave astronomy is giving age-old problems a new lease of life; one such problem is that of the self-force. A charged or massive particle moving in a curved background space-time produces a field that affects its motion, pushing it off its expected geodesic. This self-field gives ris... |
1101.4520 | Rituparno Goswami | Rituparno Goswami, George F R Ellis | Almost Birkhoff Theorem in General Relativity | 7 pages, revtex4 | null | 10.1007/s10714-011-1172-z | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend Birkhoff's theorem for almost LRS-II vacuum spacetimes to show that
the rigidity of spherical vacuum solutions of Einstein's field equations
continues even in the perturbed scenario.
| [
{
"created": "Mon, 24 Jan 2011 13:21:22 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Goswami",
"Rituparno",
""
],
[
"Ellis",
"George F R",
""
]
] | We extend Birkhoff's theorem for almost LRS-II vacuum spacetimes to show that the rigidity of spherical vacuum solutions of Einstein's field equations continues even in the perturbed scenario. |
2401.05311 | Khalil El Bourakadi | K. El Bourakadi, H.Chakir, M.Yu. Khlopov | Leptogenesis Effects on the Gravitational Waves Background: Interpreting
the NANOGrav Measurements and JWST Constraints on Primordial Black Holes | 21 pages, 10 figures, 1 table | null | null | null | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We demonstrate that the leptogenesis mechanisms, which are associated with
B-L symmetry breaking mechanism has notable effects on the production of
gravitational waves. These gravitational waves align well with the recent
observations of a stochastic gravitational wave background by NANOGrav and
pulsar-timing arrays ... | [
{
"created": "Wed, 10 Jan 2024 18:29:01 GMT",
"version": "v1"
},
{
"created": "Mon, 20 May 2024 02:03:03 GMT",
"version": "v2"
}
] | 2024-05-21 | [
[
"Bourakadi",
"K. El",
""
],
[
"Chakir",
"H.",
""
],
[
"Khlopov",
"M. Yu.",
""
]
] | We demonstrate that the leptogenesis mechanisms, which are associated with B-L symmetry breaking mechanism has notable effects on the production of gravitational waves. These gravitational waves align well with the recent observations of a stochastic gravitational wave background by NANOGrav and pulsar-timing arrays (P... |
1409.6867 | Leonardo Campanelli | Leonardo Campanelli | Electromagnetism with dimension-five operators | 7 pages, no figures, typos corrected, version matching the published
one in Physical Review D | Phys. Rev. D 90, 105014 (2014) | 10.1103/PhysRevD.90.105014 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive, in curved spacetime, the most general Lorentz-violating
electromagnetic Lagrangian containing dimension-five operators with one more
derivative than the Maxwell term in the hypothesis that Lorentz symmetry is
broken by a background four-vector $n_\mu$. We then study, for the case of
isotropic $n_\mu$, the ... | [
{
"created": "Wed, 24 Sep 2014 09:23:33 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2014 08:45:01 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Nov 2014 08:19:44 GMT",
"version": "v3"
}
] | 2014-11-19 | [
[
"Campanelli",
"Leonardo",
""
]
] | We derive, in curved spacetime, the most general Lorentz-violating electromagnetic Lagrangian containing dimension-five operators with one more derivative than the Maxwell term in the hypothesis that Lorentz symmetry is broken by a background four-vector $n_\mu$. We then study, for the case of isotropic $n_\mu$, the ge... |
1603.08719 | Andrea Addazi AndAdd | Andrea Addazi | Quantum chaos inside space-temporal Sinai billiards | Version accepted in Int. J. of Geometric Methods in Modern Physics.
arXiv admin note: substantial text overlap with arXiv:1508.04054,
arXiv:1510.09128 | null | 10.1142/S0219887816500821 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss general aspects of non-relativistic quantum chaos theory of
scattering of a quantum particle on a system of a large number of naked
singularities. We define such a system space-temporal Sinai billiard We dis-
cuss the problem in semiclassical approach. We show that in semiclassical
regime the formation of ... | [
{
"created": "Tue, 29 Mar 2016 10:51:06 GMT",
"version": "v1"
}
] | 2016-06-29 | [
[
"Addazi",
"Andrea",
""
]
] | We discuss general aspects of non-relativistic quantum chaos theory of scattering of a quantum particle on a system of a large number of naked singularities. We define such a system space-temporal Sinai billiard We dis- cuss the problem in semiclassical approach. We show that in semiclassical regime the formation of tr... |
1310.2790 | Alexey Golovnev | Alexey Golovnev | On the recently proposed Mimetic Dark Matter | 3 pages; minor corrections | Physics Letters B 728 (2014) 39 | 10.1016/j.physletb.2013.11.026 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, an interesting gravitational model was proposed in order to mimic
the effect of Dark Matter. Chamseddine and Mukhanov in the arXiv preprint
1308.5410 have separated the conformal mode of a physical metric in the form of
a squared gradient of an auxiliary scalar field. Notably, the variational
principle has ... | [
{
"created": "Thu, 10 Oct 2013 12:29:52 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2013 12:25:05 GMT",
"version": "v2"
}
] | 2013-12-02 | [
[
"Golovnev",
"Alexey",
""
]
] | Recently, an interesting gravitational model was proposed in order to mimic the effect of Dark Matter. Chamseddine and Mukhanov in the arXiv preprint 1308.5410 have separated the conformal mode of a physical metric in the form of a squared gradient of an auxiliary scalar field. Notably, the variational principle has gi... |
0711.0873 | Anil Zengino\u{g}lu C | An{\i}l Zengino\u{g}lu | A conformal approach to numerical calculations of asymptotically flat
spacetimes | PhD thesis, Max-Planck Institute for Gravitational Physics (AEI) and
University of Potsdam, June 2007, 116 pages, 47 figures. Not the official
version. Corrected two typos (p22 and p97) | null | null | AEI-2007-154 | gr-qc | null | This thesis is concerned with the development and application of conformal
techniques to numerical calculations of asymptotically flat spacetimes. The
conformal compactification technique enables us to calculate spatially
unbounded domains, thereby avoiding the introduction of an artificial timelike
outer boundary. W... | [
{
"created": "Tue, 6 Nov 2007 14:13:50 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Nov 2007 19:21:04 GMT",
"version": "v2"
}
] | 2012-05-08 | [
[
"Zenginoğlu",
"Anıl",
""
]
] | This thesis is concerned with the development and application of conformal techniques to numerical calculations of asymptotically flat spacetimes. The conformal compactification technique enables us to calculate spatially unbounded domains, thereby avoiding the introduction of an artificial timelike outer boundary. We ... |
1712.02296 | Felipe Falciano | M. L. Pe\~nafiel, F. T. Falciano | Bekenstein Inequalities and Nonlinear Electrodynamics | Accepted for publication Phys. Rev. D | null | 10.1103/PhysRevD.96.125011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bekenstein and Mayo proposed a generalised bound for the entropy, which
implies some inequalities between the charge, energy, angular momentum, and the
size of the macroscopic system. Dain has shown that Maxwell's electrodynamics
satisfies all three inequalities. We investigate the validity of these
relations in the ... | [
{
"created": "Wed, 6 Dec 2017 17:23:21 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Peñafiel",
"M. L.",
""
],
[
"Falciano",
"F. T.",
""
]
] | Bekenstein and Mayo proposed a generalised bound for the entropy, which implies some inequalities between the charge, energy, angular momentum, and the size of the macroscopic system. Dain has shown that Maxwell's electrodynamics satisfies all three inequalities. We investigate the validity of these relations in the co... |
gr-qc/9712037 | Luciano Rezzolla | L. Rezzolla(1), A. M. Abrahams(1), T. W. Baumgarte(1), G. B. Cook(2),
M. A. Scheel(2), S. L. Shapiro(1) and S. A. Teukolsky(2) ((1) University of
Illinois at Urbana-Champaign, (2) Cornell University) | Waveform propagation in black hole spacetimes: evaluating the quality of
numerical solutions | 13 pages, RevTeX, to appear in Phys. Rev. D | Phys.Rev. D57 (1998) 1084-1091 | 10.1103/PhysRevD.57.1084 | null | gr-qc | null | We compute the propagation and scattering of linear gravitational waves off a
Schwarzschild black hole using a numerical code which solves a generalization
of the Zerilli equation to a three dimensional cartesian coordinate system.
Since the solution to this problem is well understood it represents a very good
testbe... | [
{
"created": "Mon, 8 Dec 1997 16:20:27 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Rezzolla",
"L.",
""
],
[
"Abrahams",
"A. M.",
""
],
[
"Baumgarte",
"T. W.",
""
],
[
"Cook",
"G. B.",
""
],
[
"Scheel",
"M. A.",
""
],
[
"Shapiro",
"S. L.",
""
],
[
"Teukolsky",
"S. A.",
""
]
] | We compute the propagation and scattering of linear gravitational waves off a Schwarzschild black hole using a numerical code which solves a generalization of the Zerilli equation to a three dimensional cartesian coordinate system. Since the solution to this problem is well understood it represents a very good testbed ... |
1203.4305 | Ivan Arraut | Ivan Arraut | About the propagation of the Gravitational Waves in an asymptotically
de-Sitter space: Comparing two points of view | Accepted for publication in MPLA | Mod. Phys. Lett. A 28 1350019 (2013) | 10.1142/S0217732313500193 | MPLA-D-12-00344R1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the propagation of gravitational waves (GWs) in an asymptotically
de-Sitter space by expanding the perturbation around Minkowski and introducing
the effects of the Cosmological Constant ($\Lambda$), first as an additional
source (de-Donder gauge) and after as a gauge effect ($\Lambda$-gauge). In both
cases... | [
{
"created": "Tue, 20 Mar 2012 01:36:15 GMT",
"version": "v1"
},
{
"created": "Wed, 9 May 2012 16:25:34 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jul 2012 12:57:25 GMT",
"version": "v3"
},
{
"created": "Sat, 26 Jan 2013 09:08:03 GMT",
"version": "v4"
}
] | 2013-04-09 | [
[
"Arraut",
"Ivan",
""
]
] | We analyze the propagation of gravitational waves (GWs) in an asymptotically de-Sitter space by expanding the perturbation around Minkowski and introducing the effects of the Cosmological Constant ($\Lambda$), first as an additional source (de-Donder gauge) and after as a gauge effect ($\Lambda$-gauge). In both cases t... |
gr-qc/0505072 | Shinya Tomizawa | Shinya Tomizawa and Masaru Siino | Limit structure of Future Null Infinity tangent -topology of the event
horizon and gravitational wave tail- | 20 pages, 3 figures, accepted for publication in Class. Quant. Grav | Class.Quant.Grav. 23 (2006) 683-700 | 10.1088/0264-9381/23/3/009 | null | gr-qc | null | We investigated the relation between the behavior of gravitational wave at
late time and the limit structure of future null infinity tangent which will
determine the topology of the event horizon far in the future. In the present
article, we mainly consider a spacetime with two black holes. Although in most
of cases,... | [
{
"created": "Sat, 14 May 2005 10:50:05 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2005 02:02:37 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Tomizawa",
"Shinya",
""
],
[
"Siino",
"Masaru",
""
]
] | We investigated the relation between the behavior of gravitational wave at late time and the limit structure of future null infinity tangent which will determine the topology of the event horizon far in the future. In the present article, we mainly consider a spacetime with two black holes. Although in most of cases, t... |
1304.0462 | Priscilla Canizares | Priscilla Canizares (1), Scott E. Field (2), Jonathan R. Gair (1),
Manuel Tiglio (2,3) ((1) Institute of Astronomy, Cambridge (UK), (2)
University of Maryland, College Park (USA), (3) California Institute of
Technology, Pasadena (USA)) | Gravitational wave parameter estimation with compressed likelihood
evaluations | 18 pages, 12 figures (2 updated) and 2 tables. Minor edits based on
referee report | Phys. Rev. D 87, 124005 (2013) | 10.1103/PhysRevD.87.124005 | null | gr-qc astro-ph.IM stat.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the main bottlenecks in gravitational wave (GW) astronomy is the high
cost of performing parameter estimation and GW searches on the fly. We propose
a novel technique based on Reduced Order Quadratures (ROQs), an application and
data-specific quadrature rule, to perform fast and accurate likelihood
evaluations... | [
{
"created": "Mon, 1 Apr 2013 20:02:21 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2013 11:35:49 GMT",
"version": "v2"
}
] | 2013-09-26 | [
[
"Canizares",
"Priscilla",
""
],
[
"Field",
"Scott E.",
""
],
[
"Gair",
"Jonathan R.",
""
],
[
"Tiglio",
"Manuel",
""
]
] | One of the main bottlenecks in gravitational wave (GW) astronomy is the high cost of performing parameter estimation and GW searches on the fly. We propose a novel technique based on Reduced Order Quadratures (ROQs), an application and data-specific quadrature rule, to perform fast and accurate likelihood evaluations. ... |
1403.7054 | Ettore Minguzzi | E. Minguzzi | Spacetime metrics from gauge potentials | 8 pages. Contribution to the special "Symmetry" volume: Physics based
on two-by-two matrices | Symmetry 6 (2014) 164-170 | 10.3390/sym6020164 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present an approach to gravity in which the spacetime metric is constructed
from a non-Abelian gauge potential with values in the Lie algebra of the group
U(2) (or the Lie algebra of quaternions). If the curvature of this potential
vanishes, the metric reduces to a canonical curved background form reminiscent
of th... | [
{
"created": "Thu, 27 Mar 2014 14:32:26 GMT",
"version": "v1"
}
] | 2014-03-28 | [
[
"Minguzzi",
"E.",
""
]
] | I present an approach to gravity in which the spacetime metric is constructed from a non-Abelian gauge potential with values in the Lie algebra of the group U(2) (or the Lie algebra of quaternions). If the curvature of this potential vanishes, the metric reduces to a canonical curved background form reminiscent of the ... |
1307.4116 | Neil J. Cornish | Matthew R. Adams and Neil J. Cornish | Detecting a Stochastic Gravitational Wave Background in the presence of
a Galactic Foreground and Instrument Noise | 10 pages, 13 figures. Error in 6 link results corrected | Phys. Rev. D 89, 022001 (2014) | 10.1103/PhysRevD.89.022001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detecting a stochastic gravitational wave background requires that we first
understand and model any astrophysical foregrounds. In the millihertz frequency
band, the predominate foreground signal will be from unresolved white dwarf
binaries in the galaxy. We build on our previous work to show that a stochastic
gravit... | [
{
"created": "Mon, 15 Jul 2013 22:03:30 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Oct 2013 15:37:16 GMT",
"version": "v2"
}
] | 2014-01-23 | [
[
"Adams",
"Matthew R.",
""
],
[
"Cornish",
"Neil J.",
""
]
] | Detecting a stochastic gravitational wave background requires that we first understand and model any astrophysical foregrounds. In the millihertz frequency band, the predominate foreground signal will be from unresolved white dwarf binaries in the galaxy. We build on our previous work to show that a stochastic gravitat... |
gr-qc/9509024 | Steve Carlip | S. Carlip | Statistical Mechanics and Black Hole Entropy | 10 pages, one figure in separate (uuencoded, compressed) tar file;
factor of 2 corrected in eqn. (2.8) | null | null | UCD-95-30 | gr-qc hep-th | null | I review a new (and still tentative) approach to black hole thermodynamics
that seeks to explain black hole entropy in terms of microscopic quantum
gravitational boundary states induced on the black hole horizon.
| [
{
"created": "Wed, 13 Sep 1995 17:45:20 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 1995 18:35:46 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Carlip",
"S.",
""
]
] | I review a new (and still tentative) approach to black hole thermodynamics that seeks to explain black hole entropy in terms of microscopic quantum gravitational boundary states induced on the black hole horizon. |
2204.02419 | Jorge Delgado B.S. | Jorge F. M. Delgado | Spinning Black Holes with Scalar Hair and Horizonless Compact Objects
within and beyond General Relativity | Ph.D. thesis defended at the University of Aveiro in March 2022.
Based on the papers arXiv:1804.04910, arXiv:1903.01488, arXiv:2002.05012,
arXiv:2005.05982, arXiv:2012.03952 and arXiv:2107.03404 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The last years have brought upon us a golden age of observational
gravitational physics. The several observations by the LIGO/Virgo/KAGRA
collaboration about gravitational waves and by the EHT collaboration about the
shadow and lensing of light around the supermassive black hole in the centre of
M87 will point the sc... | [
{
"created": "Tue, 5 Apr 2022 18:00:19 GMT",
"version": "v1"
}
] | 2022-04-07 | [
[
"Delgado",
"Jorge F. M.",
""
]
] | The last years have brought upon us a golden age of observational gravitational physics. The several observations by the LIGO/Virgo/KAGRA collaboration about gravitational waves and by the EHT collaboration about the shadow and lensing of light around the supermassive black hole in the centre of M87 will point the scie... |
0911.1020 | Flavio Mercati | Giovanni Amelino-Camelia, Claus Laemmerzahl, Flavio Mercati, Guglielmo
M. Tino | Constraining the energy-momentum dispersion relation with Planck-scale
sensitivity using cold atoms | LaTex, 4 pages, preprint version of Physical Review Letters 103
(2009) 171302 | Phys.Rev.Lett.103:171302,2009 | 10.1103/PhysRevLett.103.171302 | null | gr-qc physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the results of ultra-precise cold-atom-recoil experiments to constrain
the form of the energy-momentum dispersion relation, a structure that is
expected to be modified in several quantum-gravity approaches. Our strategy of
analysis applies to the nonrelativistic (small speeds) limit of the dispersion
relation,... | [
{
"created": "Thu, 5 Nov 2009 12:57:04 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Laemmerzahl",
"Claus",
""
],
[
"Mercati",
"Flavio",
""
],
[
"Tino",
"Guglielmo M.",
""
]
] | We use the results of ultra-precise cold-atom-recoil experiments to constrain the form of the energy-momentum dispersion relation, a structure that is expected to be modified in several quantum-gravity approaches. Our strategy of analysis applies to the nonrelativistic (small speeds) limit of the dispersion relation, a... |
1406.0634 | Jose Natario | Jose Natario | Relativistic elasticity of rigid rods and strings | 20 pages, 8 figures; v2: typos corrected, figure added, some points
clarified, matches final published version; v3: typos in the references fixed | Gen. Rel. Grav. 46 (2014) 1816 | 10.1007/s10714-014-1816-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the equation of motion for a rigid one-dimensional elastic body
(i.e. a rod or string whose speed of sound is equal to the speed of light) in a
two-dimensional spacetime is simply the wave equation. We then solve this
equation in a few simple examples: a rigid rod colliding with an unmovable
wall, a rigi... | [
{
"created": "Tue, 3 Jun 2014 09:07:30 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2014 09:36:19 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Oct 2019 10:04:11 GMT",
"version": "v3"
}
] | 2019-10-15 | [
[
"Natario",
"Jose",
""
]
] | We show that the equation of motion for a rigid one-dimensional elastic body (i.e. a rod or string whose speed of sound is equal to the speed of light) in a two-dimensional spacetime is simply the wave equation. We then solve this equation in a few simple examples: a rigid rod colliding with an unmovable wall, a rigid ... |
1806.03894 | Amare Abebe | Alnadhief H. A. Alfedeel, Amare Abebe and Hussam M. Gubara | A Generalized Solution of Bianchi Type-V Models with Time-dependent $G$
and $\Lambda$ | 21 pages, 12 figures. Published version | Universe 2018, 4(8), 83 | 10.3390/universe4080083 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the homogeneous but anisotropic Bianchi type-V cosmological model
with time-dependent gravitational and cosmological "constants". Exact solutions
of the Einstein field equations (EFEs) are presented in terms of adjustable
parameters of quantum field theory in a spatially curved and expanding
background. It h... | [
{
"created": "Mon, 11 Jun 2018 10:30:30 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jul 2018 15:17:11 GMT",
"version": "v2"
}
] | 2018-07-30 | [
[
"Alfedeel",
"Alnadhief H. A.",
""
],
[
"Abebe",
"Amare",
""
],
[
"Gubara",
"Hussam M.",
""
]
] | We study the homogeneous but anisotropic Bianchi type-V cosmological model with time-dependent gravitational and cosmological "constants". Exact solutions of the Einstein field equations (EFEs) are presented in terms of adjustable parameters of quantum field theory in a spatially curved and expanding background. It has... |
1204.2683 | Mordehai Milgrom | Mordehai Milgrom (Weizmann Institute) | Practically linear analogs of the Born-Infeld and other nonlinear
theories | 20 pages, Version published in Phys. Rev. D | Phys. Rev. D 85 105018 (2012) | 10.1103/PhysRevD.85.105018 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss theories that describe fully nonlinear physics, while being
practically linear (PL), in that they require solving only linear differential
equations. These theories may be interesting in themselves as manageable
nonlinear theories. But, they can also be chosen to emulate genuinely nonlinear
theories of spec... | [
{
"created": "Thu, 12 Apr 2012 10:55:56 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jun 2012 13:00:12 GMT",
"version": "v2"
}
] | 2012-06-11 | [
[
"Milgrom",
"Mordehai",
"",
"Weizmann Institute"
]
] | I discuss theories that describe fully nonlinear physics, while being practically linear (PL), in that they require solving only linear differential equations. These theories may be interesting in themselves as manageable nonlinear theories. But, they can also be chosen to emulate genuinely nonlinear theories of specia... |
2207.06994 | Anish Das | Anish Das, Ashis Saha, Sunandan Gangopadhyay | Shadow of Kottler black hole in the presence of plasma for a co-moving
observer | V1, 21 Pages, 12 Figures; V2, 23 Pages, 18 Figures; Accepted in
Classical and Quantum Gravity | Class. Quantum Grav. 40 015008 (2023) 1 | 10.1088/1361-6382/aca5e4 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider a spherically symmetric black hole metric in (3+1)-dimensions in
presence of a positive cosmological constant $\Lambda$. We use a general
approach as proposed in \cite{1} to transform the metric in co-moving
coordinates. Then for a general metric we have evaluated the angular shadow
size both in absence a... | [
{
"created": "Thu, 14 Jul 2022 15:22:34 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Nov 2022 14:30:22 GMT",
"version": "v2"
}
] | 2022-12-12 | [
[
"Das",
"Anish",
""
],
[
"Saha",
"Ashis",
""
],
[
"Gangopadhyay",
"Sunandan",
""
]
] | We consider a spherically symmetric black hole metric in (3+1)-dimensions in presence of a positive cosmological constant $\Lambda$. We use a general approach as proposed in \cite{1} to transform the metric in co-moving coordinates. Then for a general metric we have evaluated the angular shadow size both in absence and... |
2301.00669 | Lucrezia Ravera | Damianos Iosifidis, Ratbay Myrzakulov, Lucrezia Ravera | Cosmology of Metric-Affine $R + \beta R^2$ Gravity with Pure Shear
Hypermomentum | 26 pages | Fortsch.Phys. 72 (2024) 1, 2300003 | 10.1002/prop.202300003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the cosmological aspects of metric-affine $f(R)$
gravity with hyperfluid. The equations of motion of the theory are obtained by
varying the action with respect to the metric and the independent connection.
Subsequently, considering a Friedmann-Lema\^itre-Robertson-Walker background,
we derive t... | [
{
"created": "Thu, 29 Dec 2022 18:52:40 GMT",
"version": "v1"
}
] | 2024-04-29 | [
[
"Iosifidis",
"Damianos",
""
],
[
"Myrzakulov",
"Ratbay",
""
],
[
"Ravera",
"Lucrezia",
""
]
] | In this paper we study the cosmological aspects of metric-affine $f(R)$ gravity with hyperfluid. The equations of motion of the theory are obtained by varying the action with respect to the metric and the independent connection. Subsequently, considering a Friedmann-Lema\^itre-Robertson-Walker background, we derive the... |
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