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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0801.0016 | Jan {\AA}man | Jan E. Aman, Narit Pidokrajt | Ruppeiner Geometry of Black Hole Thermodynamics | 5 pages, 2 figures. Talk given at 30th Spanish Relativity Meeting
(ERE 2007): Relativistic Astrophysics And Cosmology, 10-14 Sep 2007, Puerto
de La Cruz, Tenerife, Spain | null | 10.1051/eas:0830042 | null | gr-qc | null | The Hessian of the entropy function can be thought of as a metric tensor on
state space. In the context of thermodynamical fluctuation theory Ruppeiner has
argued that the Riemannian geometry of this metric gives insight into the
underlying statistical mechanical system; the claim is supported by numerous
examples. W... | [
{
"created": "Fri, 28 Dec 2007 23:57:11 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Aman",
"Jan E.",
""
],
[
"Pidokrajt",
"Narit",
""
]
] | The Hessian of the entropy function can be thought of as a metric tensor on state space. In the context of thermodynamical fluctuation theory Ruppeiner has argued that the Riemannian geometry of this metric gives insight into the underlying statistical mechanical system; the claim is supported by numerous examples. We ... |
2005.10794 | Cecilia Chirenti | Cecilia Chirenti, Camilo Posada and Victor Guedes | Where is Love? Tidal deformability in the black hole compactness limit | 15 pages, 5 figures, version accepted for publication in CQG | Class. Quantum Grav. 37, 195017 (2020) | 10.1088/1361-6382/abb07a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the macroscopically measurable effects of gravity is the tidal
deformability of astrophysical objects, which can be quantified by their tidal
Love numbers. For planets and stars, these numbers measure the resistance of
their material against the tidal forces, and the resulting contribution to
their gravitation... | [
{
"created": "Thu, 21 May 2020 17:22:26 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Aug 2020 15:08:56 GMT",
"version": "v2"
}
] | 2020-09-25 | [
[
"Chirenti",
"Cecilia",
""
],
[
"Posada",
"Camilo",
""
],
[
"Guedes",
"Victor",
""
]
] | One of the macroscopically measurable effects of gravity is the tidal deformability of astrophysical objects, which can be quantified by their tidal Love numbers. For planets and stars, these numbers measure the resistance of their material against the tidal forces, and the resulting contribution to their gravitational... |
2206.13515 | Branko Dragovich | Ivan Dimitrijevic, Branko Dragovich, Zoran Rakic and Jelena Stankovic | Nonlocal de Sitter gravity and its exact cosmological solutions | 27 pages, 5 figures. Comments welcome | null | 10.1007/JHEP12(2022)054 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | This paper is devoted to a simple nonlocal de Sitter gravity model and its
exact vacuum cosmological solutions. In the Einstein-Hilbert action with
$\Lambda$ term, we introduce nonlocality by the following way: $R - 2 \Lambda =
\sqrt{R-2\Lambda}\ \sqrt{R-2\Lambda} \to \sqrt{R-2\Lambda}\ F(\Box)\
\sqrt{R-2\Lambda} ,$ ... | [
{
"created": "Mon, 27 Jun 2022 05:50:34 GMT",
"version": "v1"
}
] | 2022-12-28 | [
[
"Dimitrijevic",
"Ivan",
""
],
[
"Dragovich",
"Branko",
""
],
[
"Rakic",
"Zoran",
""
],
[
"Stankovic",
"Jelena",
""
]
] | This paper is devoted to a simple nonlocal de Sitter gravity model and its exact vacuum cosmological solutions. In the Einstein-Hilbert action with $\Lambda$ term, we introduce nonlocality by the following way: $R - 2 \Lambda = \sqrt{R-2\Lambda}\ \sqrt{R-2\Lambda} \to \sqrt{R-2\Lambda}\ F(\Box)\ \sqrt{R-2\Lambda} ,$ wh... |
gr-qc/9710057 | A. Mikovic | A. Mikovic and V. Radovanovic | Loop Corrections for 2D Hawking Radiation | 3 pages, latex. Talk presented at the MG8 meeting in Jerusalem, June
1997. Minor typos have been corrected | null | null | null | gr-qc hep-th | null | We describe how the reduced phase space quantization of the CGHS model of 2d
black hole formation allows one to calculate the backreaction up to any finite
order in matter loops. We then analyze the backreaction in the Hawking
radiation up to two loops. At one-loop order the Hawking temperature does not
change, while... | [
{
"created": "Fri, 10 Oct 1997 08:59:11 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 1997 09:40:27 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Mikovic",
"A.",
""
],
[
"Radovanovic",
"V.",
""
]
] | We describe how the reduced phase space quantization of the CGHS model of 2d black hole formation allows one to calculate the backreaction up to any finite order in matter loops. We then analyze the backreaction in the Hawking radiation up to two loops. At one-loop order the Hawking temperature does not change, while a... |
2111.05963 | Marek Biesiada | Marek Biesiada and Sreekanth Harikumar | Gravitational lensing of Continuous Gravitational Waves | 10 pages,1 figure | Universe 2021, 7(12), 502 | 10.3390/universe7120502 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Continuous gravitational waves are analogous to monochromatic light and
therefore could be used to detect wave effects like interference or
diffraction. This would be possible with strongly lensed gravitational waves.
This article reviews and summaries the theory of gravitational lensing in the
context of gravitation... | [
{
"created": "Wed, 10 Nov 2021 22:02:54 GMT",
"version": "v1"
}
] | 2022-02-02 | [
[
"Biesiada",
"Marek",
""
],
[
"Harikumar",
"Sreekanth",
""
]
] | Continuous gravitational waves are analogous to monochromatic light and therefore could be used to detect wave effects like interference or diffraction. This would be possible with strongly lensed gravitational waves. This article reviews and summaries the theory of gravitational lensing in the context of gravitational... |
0709.2657 | Massimiliano Rinaldi | Massimiliano Rinaldi | A momentum-space representation of Green's functions with modified
dispersion on ultra-static space-time | revtex, version accepted for publication in Phys. Rev. D | Phys.Rev.D76:104027,2007 | 10.1103/PhysRevD.76.104027 | null | gr-qc hep-th | null | We consider the Green's functions associated to a scalar field propagating on
a curved, ultra-static background, in the presence of modified dispersion
relations. The usual proper-time deWitt-Schwinger procedure to obtain a series
representation of the Green's functions is doomed to failure, because of higher
order s... | [
{
"created": "Mon, 17 Sep 2007 15:01:54 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2007 12:18:08 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Oct 2007 16:45:38 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Rinaldi",
"Massimiliano",
""
]
] | We consider the Green's functions associated to a scalar field propagating on a curved, ultra-static background, in the presence of modified dispersion relations. The usual proper-time deWitt-Schwinger procedure to obtain a series representation of the Green's functions is doomed to failure, because of higher order spa... |
gr-qc/9211006 | null | David Hochberg and Thomas W. Kephart | Wormhole Cosmology and the Horizon Problem | 13 pages, in RevTex | Phys.Rev.Lett. 70 (1993) 2665-2668 | 10.1103/PhysRevLett.70.2665 | VAND-TH-92-5, NSF-ITP-92-77 | gr-qc hep-th | null | We construct an explicit class of dynamic lorentzian wormholes connecting
Friedmann-Robertson-Walker (FRW) spacetimes. These wormholes can allow two-way
transmission of signals between spatially separated regions of spacetime and
could permit such regions to come into thermal contact. The cosmology of a
network of ea... | [
{
"created": "Wed, 4 Nov 1992 22:03:53 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Hochberg",
"David",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | We construct an explicit class of dynamic lorentzian wormholes connecting Friedmann-Robertson-Walker (FRW) spacetimes. These wormholes can allow two-way transmission of signals between spatially separated regions of spacetime and could permit such regions to come into thermal contact. The cosmology of a network of earl... |
1403.0854 | Jeremy Neveu | J. Neveu, V. Ruhlmann-Kleider, P. Astier, M. Besan\c{c}on, A. Conley,
J. Guy, A. M\"oller, N. Palanque-Delabrouille and E. Babichev | First experimental constraints on the disformally coupled Galileon model | 9 pages, 6 figures, updated version | A&A 569, A90 (2014) | 10.1051/0004-6361/201423758 | LPT-Orsay-14-79 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Galileon model is a modified gravity model that can explain the late-time
accelerated expansion of the Universe. In a previous work, we derived
experimental constraints on the Galileon model with no explicit coupling to
matter and showed that this model agrees with the most recent cosmological
data. In the contex... | [
{
"created": "Tue, 4 Mar 2014 16:50:08 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Nov 2014 12:24:39 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Nov 2014 12:46:52 GMT",
"version": "v3"
}
] | 2014-11-07 | [
[
"Neveu",
"J.",
""
],
[
"Ruhlmann-Kleider",
"V.",
""
],
[
"Astier",
"P.",
""
],
[
"Besançon",
"M.",
""
],
[
"Conley",
"A.",
""
],
[
"Guy",
"J.",
""
],
[
"Möller",
"A.",
""
],
[
"Palanque-Delabrouille... | The Galileon model is a modified gravity model that can explain the late-time accelerated expansion of the Universe. In a previous work, we derived experimental constraints on the Galileon model with no explicit coupling to matter and showed that this model agrees with the most recent cosmological data. In the context ... |
gr-qc/0209104 | Kayll Lake | Kayll Lake | All static spherically symmetric perfect fluid solutions of Einstein's
Equations | Final form to appear in Phys Rev D. Includes a number of
clarifications | Phys.Rev. D67 (2003) 104015 | 10.1103/PhysRevD.67.104015 | null | gr-qc astro-ph | null | An algorithm based on the choice of a single monotone function (subject to
boundary conditions) is presented which generates all regular static
spherically symmetric perfect fluid solutions of Einstein's equations. For
physically relevant solutions the generating functions must be restricted by
non-trivial integral-d... | [
{
"created": "Fri, 27 Sep 2002 17:45:14 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Oct 2002 21:16:34 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Oct 2002 15:33:46 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Apr 2003 13:24:35 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Lake",
"Kayll",
""
]
] | An algorithm based on the choice of a single monotone function (subject to boundary conditions) is presented which generates all regular static spherically symmetric perfect fluid solutions of Einstein's equations. For physically relevant solutions the generating functions must be restricted by non-trivial integral-dif... |
1905.10823 | Bruno Arderucio Costa | Bruno Arderucio-Costa | Laws of black hole thermodynamics in semiclassical gravity | null | 2020 Class. Quantum Grav. 37 225004 | 10.1088/1361-6382/abb638 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first and second laws of black hole thermodynamics are verified to emerge
from a generic semiclassical theory of gravity for which a Hamiltonian can be
defined. The first law is established for stationary spacetimes, and the second
law is established in the here defined "piecewise stationary" spacetimes. Black
ho... | [
{
"created": "Sun, 26 May 2019 16:00:17 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2020 20:09:02 GMT",
"version": "v2"
}
] | 2021-09-07 | [
[
"Arderucio-Costa",
"Bruno",
""
]
] | The first and second laws of black hole thermodynamics are verified to emerge from a generic semiclassical theory of gravity for which a Hamiltonian can be defined. The first law is established for stationary spacetimes, and the second law is established in the here defined "piecewise stationary" spacetimes. Black hole... |
1102.1810 | Hirotaka Yoshino | Hirotaka Yoshino | Black hole initial data in Gauss-Bonnet gravity: Momentarily static case | 30 pages, 10 figures, submitted to PRD | Phys.Rev.D83:104010,2011 | 10.1103/PhysRevD.83.104010 | KEK-TH-1431 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the method for generating the initial data of black hole systems in
Gauss-Bonnet (GB) gravity. The initial data are assumed to be momentarily
static and conformally flat. Although the equation for the conformal factor is
highly nonlinear, it is successfully solved by numerical relaxation for
one-black-hole a... | [
{
"created": "Wed, 9 Feb 2011 08:39:56 GMT",
"version": "v1"
}
] | 2011-05-10 | [
[
"Yoshino",
"Hirotaka",
""
]
] | We study the method for generating the initial data of black hole systems in Gauss-Bonnet (GB) gravity. The initial data are assumed to be momentarily static and conformally flat. Although the equation for the conformal factor is highly nonlinear, it is successfully solved by numerical relaxation for one-black-hole and... |
2203.14435 | Masanori Tomonaga | Masanori Tomonaga, Toshifumi Futamase | On the gauge invariance of the locally averaged Friedmann Universe and
the Hubble tension | 9 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Hubble tension cast a blight on the standard cosmology. As a possible
attitude to the problem, the local variation of the expansion rate in an
inhomogeneous cosmology has been proposed where the spatial averaging over a
finite domain was introduced in order to construct local Friedmann spacetime.
However, it is n... | [
{
"created": "Mon, 28 Mar 2022 01:13:58 GMT",
"version": "v1"
}
] | 2022-03-29 | [
[
"Tomonaga",
"Masanori",
""
],
[
"Futamase",
"Toshifumi",
""
]
] | The Hubble tension cast a blight on the standard cosmology. As a possible attitude to the problem, the local variation of the expansion rate in an inhomogeneous cosmology has been proposed where the spatial averaging over a finite domain was introduced in order to construct local Friedmann spacetime. However, it is not... |
1712.03592 | Manuel Rodrigues | Manuel E. Rodrigues and Ednaldo L. B. Junior | Comment on "Generic rotating regular black holes in general relativity
coupled to non-linear electrodynamics" | 3 pages | Physical Review D 96, 128502 (2017) | 10.1103/PhysRevD.96.128502 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that there is an inconsistency in the class of solutions obtained in
Phys. Rev. D {\bf 95}, 084037 (2017). This inconsistency is due to the
approximate relation between lagrangian density and its derivative for
Non-Linear Electrodynamics. We present an algorithm to obtain new classes of
solutions.
| [
{
"created": "Sun, 10 Dec 2017 20:57:32 GMT",
"version": "v1"
}
] | 2017-12-12 | [
[
"Rodrigues",
"Manuel E.",
""
],
[
"Junior",
"Ednaldo L. B.",
""
]
] | We show that there is an inconsistency in the class of solutions obtained in Phys. Rev. D {\bf 95}, 084037 (2017). This inconsistency is due to the approximate relation between lagrangian density and its derivative for Non-Linear Electrodynamics. We present an algorithm to obtain new classes of solutions. |
2212.01019 | Man Ho Chan | Man Ho Chan and Chak Man Lee | The solar system test for the general modified gravity theories | Accepted in MNRAS | MNRAS, 518, 6238-6242 (2023) | 10.1093/mnras/stac3509 | null | gr-qc astro-ph.EP | http://creativecommons.org/licenses/by/4.0/ | In the past few decades, various versions of modified gravity theories were
proposed to mimic the effect of dark matter. Compared with the conventional
Newtonian or relativistic dynamics, these theories contain some extra apparent
force terms in the dynamical equations to replace the role of dark matter.
Generally sp... | [
{
"created": "Fri, 2 Dec 2022 08:13:36 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"Chan",
"Man Ho",
""
],
[
"Lee",
"Chak Man",
""
]
] | In the past few decades, various versions of modified gravity theories were proposed to mimic the effect of dark matter. Compared with the conventional Newtonian or relativistic dynamics, these theories contain some extra apparent force terms in the dynamical equations to replace the role of dark matter. Generally spea... |
1707.07242 | Ken-Ichi Nakao | Ken-ichi Nakao, Pankaj S. Joshi, Jun-Qi Guo, Prashant Kocherlakota,
Hideyuki Tagoshi, Tomohiro Harada, Mandar Patil, Andrzej Krolak | On the stability of a superspinar | 5 pages | null | 10.1016/j.physletb.2018.03.014 | OCU-PHYS-468, AP-GR-140, RUP-17-14 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The superspinar proposed by Gimon and Horava is a rapidly rotating compact
entity whose exterior is described by the over-spinning Kerr geometry. The
compact entity itself is expected to be governed by superstringy effects, and
in astrophysical scenarios it can give rise to interesting observable
phenomena. Earlier i... | [
{
"created": "Sun, 23 Jul 2017 04:02:07 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Nakao",
"Ken-ichi",
""
],
[
"Joshi",
"Pankaj S.",
""
],
[
"Guo",
"Jun-Qi",
""
],
[
"Kocherlakota",
"Prashant",
""
],
[
"Tagoshi",
"Hideyuki",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Patil",
"Mandar",
""
]... | The superspinar proposed by Gimon and Horava is a rapidly rotating compact entity whose exterior is described by the over-spinning Kerr geometry. The compact entity itself is expected to be governed by superstringy effects, and in astrophysical scenarios it can give rise to interesting observable phenomena. Earlier it ... |
gr-qc/0005129 | Daisuke Ida | Daisuke Ida | No Black Hole Theorem in Three-Dimensional Gravity | 3 pages, no figures, to be published in Physical Review Letters | Phys.Rev.Lett. 85 (2000) 3758-3760 | 10.1103/PhysRevLett.85.3758 | null | gr-qc | null | A common property of known black hole solutions in (2+1)-dimensional gravity
is that they require a negative cosmological constant. In this letter, it is
shown that a (2+1)-dimensional gravity theory which satisfies the dominant
energy condition forbids the existence of a black hole to explain the above
situation.
| [
{
"created": "Wed, 31 May 2000 19:06:46 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2000 15:30:13 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Ida",
"Daisuke",
""
]
] | A common property of known black hole solutions in (2+1)-dimensional gravity is that they require a negative cosmological constant. In this letter, it is shown that a (2+1)-dimensional gravity theory which satisfies the dominant energy condition forbids the existence of a black hole to explain the above situation. |
2405.06740 | Paulo Luz | Paulo Luz and Sante Carloni | Adiabatic radial perturbations of relativistic stars: analytic solutions
to an old problem | 20 pages, 4 figures. arXiv admin note: text overlap with
arXiv:2405.05321 | null | null | null | gr-qc astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | We present a new system of equations that fully characterizes adiabatic,
radial perturbations of perfect fluid stars within the theory of general
relativity. The properties of the system are discussed, and, provided that the
equilibrium spacetime verifies some general regularity conditions, analytical
solutions for t... | [
{
"created": "Fri, 10 May 2024 18:00:01 GMT",
"version": "v1"
}
] | 2024-05-14 | [
[
"Luz",
"Paulo",
""
],
[
"Carloni",
"Sante",
""
]
] | We present a new system of equations that fully characterizes adiabatic, radial perturbations of perfect fluid stars within the theory of general relativity. The properties of the system are discussed, and, provided that the equilibrium spacetime verifies some general regularity conditions, analytical solutions for the... |
2206.08854 | Alex Pandya | Alex Pandya and Justin L. Ripley | Dynamics of a nonminimally coupled scalar field in asymptotically
$AdS_4$ spacetime | 26 pages, 8 figures; updated to match published version (CQG) | null | 10.1088/1361-6382/ac9723 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We numerically investigate the stability of four-dimensional asymptotically
anti-de Sitter ($AdS_4$) spacetime for a class of nonminimally coupled scalar
field theories. In particular, we study how the coupling affects the formation
of black holes and transfer of energy to different spatial/temporal scales. We
conclu... | [
{
"created": "Fri, 17 Jun 2022 15:53:32 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Oct 2022 17:21:28 GMT",
"version": "v2"
}
] | 2022-10-18 | [
[
"Pandya",
"Alex",
""
],
[
"Ripley",
"Justin L.",
""
]
] | We numerically investigate the stability of four-dimensional asymptotically anti-de Sitter ($AdS_4$) spacetime for a class of nonminimally coupled scalar field theories. In particular, we study how the coupling affects the formation of black holes and transfer of energy to different spatial/temporal scales. We conclude... |
1208.3841 | Alfred D. Shapere | Alfred Shapere and Frank Wilczek | Constraints on Chronologies | 22 pages, 4 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The time ordering of two spacelike separated events is arbitrary, when all
inertial frames are taken into account, but for three or more events it is not
generally so. We determine the structure of possible time orderings, or
chronologies, for multiple events in any number of dimensions, analytically and
exhaustively... | [
{
"created": "Sun, 19 Aug 2012 15:00:49 GMT",
"version": "v1"
}
] | 2012-08-21 | [
[
"Shapere",
"Alfred",
""
],
[
"Wilczek",
"Frank",
""
]
] | The time ordering of two spacelike separated events is arbitrary, when all inertial frames are taken into account, but for three or more events it is not generally so. We determine the structure of possible time orderings, or chronologies, for multiple events in any number of dimensions, analytically and exhaustively f... |
1307.2882 | Larus Thorlacius | V. Keranen and L. Thorlacius | Holographic geometries for condensed matter applications | 20 pages, to appear in the proceedings of the 13th Marcel Grossman
Meeting (Stockholm, Sweden, July 1-7, 2012) | null | null | NORDITA-2013-47 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Holographic modeling of strongly correlated many-body systems motivates the
study of novel spacetime geometries where the scaling behavior of quantum
critical systems is encoded into spacetime symmetries. Einstein-Dilaton-Maxwell
theory has planar black brane solutions that exhibit Lifshitz scaling and in
some cases ... | [
{
"created": "Wed, 10 Jul 2013 19:09:33 GMT",
"version": "v1"
}
] | 2013-07-11 | [
[
"Keranen",
"V.",
""
],
[
"Thorlacius",
"L.",
""
]
] | Holographic modeling of strongly correlated many-body systems motivates the study of novel spacetime geometries where the scaling behavior of quantum critical systems is encoded into spacetime symmetries. Einstein-Dilaton-Maxwell theory has planar black brane solutions that exhibit Lifshitz scaling and in some cases hy... |
1503.02097 | Ragab Gad | Ragab M. Gad | Homothetic Motion in a Bianchi Type-I Model in Lyra Geometry | 15 pages | Int. J. Theor. Phys. 2015 | 10.1007/s10773-015-2528-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study a homothetic vector field of a Bianchi type-I model
based on Lyra geometry. The cases when a displacement vector is function of $t$
and when it is constant are considered. In both two cases we investigate the
equation of state. A comparison between the obtained results, using Lyra
geometry, and... | [
{
"created": "Fri, 6 Mar 2015 21:50:48 GMT",
"version": "v1"
}
] | 2015-03-10 | [
[
"Gad",
"Ragab M.",
""
]
] | In this paper we study a homothetic vector field of a Bianchi type-I model based on Lyra geometry. The cases when a displacement vector is function of $t$ and when it is constant are considered. In both two cases we investigate the equation of state. A comparison between the obtained results, using Lyra geometry, and t... |
gr-qc/0103024 | James S. Graber | James S. Graber | Constraining Post_Newtonian Parameters With Gravitational Waves | 8 pages, abbreviated version to be submitted to conference
proceedings Twentieth Texas Symposium on Relativistic Astrophysics, Eds. J.
Craig Wheeler and Hugo Martel | null | 10.1063/1.1419661 | null | gr-qc | null | We re-express gravitational wave results in terms of post-Newtonian
parameters. Using these expressions, and some simplifying assumptions, we
compute that in a favorable case, i.e. a ten solar-mass black hole spiraling in
to a 10^6 solar-mass black hole, LISA observations will be able to constrain at
the 10% level or... | [
{
"created": "Thu, 8 Mar 2001 13:29:57 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Graber",
"James S.",
""
]
] | We re-express gravitational wave results in terms of post-Newtonian parameters. Using these expressions, and some simplifying assumptions, we compute that in a favorable case, i.e. a ten solar-mass black hole spiraling in to a 10^6 solar-mass black hole, LISA observations will be able to constrain at the 10% level or b... |
1604.03796 | Muhammad Zubair | M. Zubair, G. Abbas | Reconstructing QCD ghost $f(R,T)$ models | 23 pages, 12 figures | Astrophys. Space Sci. 357, 154 (2015) | 10.1007/s10509-015-2387-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconstruct $f(R,T)$ theory (where $R$ is the scalar curvature and $T$ is
the trace of energy-momentum tensor) in the framework of QCD ghost dark energy
models. In this study, we concentrate on particular models of $f(R,T)$ gravity
which permits the standard continuity equation in this theory. It is found that
rec... | [
{
"created": "Sat, 9 Apr 2016 13:05:00 GMT",
"version": "v1"
}
] | 2016-04-14 | [
[
"Zubair",
"M.",
""
],
[
"Abbas",
"G.",
""
]
] | We reconstruct $f(R,T)$ theory (where $R$ is the scalar curvature and $T$ is the trace of energy-momentum tensor) in the framework of QCD ghost dark energy models. In this study, we concentrate on particular models of $f(R,T)$ gravity which permits the standard continuity equation in this theory. It is found that recon... |
0806.2767 | H Mohseni Sadjadi | H. Mohseni Sadjadi and N. Vadood | Notes on interacting holographic dark energy model in a closed universe | 10 pages, typos corrected, some explanations and references added and
updated, accepted for publication in JCAP | J. Cosmol. Astropart. Phys. 0808, 036 (2008) | 10.1088/1475-7516/2008/08/036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider interacting holographic dark energy model in Friedmann Robertson
Walker space time with positive spatial curvature and investigate the behavior
of curvature parameter and dark energy density in accelerated expanding epoch.
We also derive some conditions needed to cross the phantom divide line in this
mode... | [
{
"created": "Tue, 17 Jun 2008 12:11:55 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Aug 2008 11:17:41 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Sep 2008 13:41:29 GMT",
"version": "v3"
}
] | 2021-03-12 | [
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Vadood",
"N.",
""
]
] | We consider interacting holographic dark energy model in Friedmann Robertson Walker space time with positive spatial curvature and investigate the behavior of curvature parameter and dark energy density in accelerated expanding epoch. We also derive some conditions needed to cross the phantom divide line in this model. |
gr-qc/9811026 | Bonanno | Alfio Bonanno (Catania U.), Martin Reuter (Mainz U.) | Quantum Gravity effects near the null black hole singularity | 15 Pages, one figure. Minor changes in the presentation, to appear on
Phys.Rev.D | Phys.Rev. D60 (1999) 084011 | 10.1103/PhysRevD.60.084011 | null | gr-qc hep-th | null | The structure of the Cauchy Horizon singularity of a black hole formed in a
generic collapse is studied by means of a renormalization group equation for
quantum gravity. It is shown that during the early evolution of the Cauchy
Horizon the increase of the mass function is damped when quantum fluctuations
of the metri... | [
{
"created": "Mon, 9 Nov 1998 18:37:02 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jul 1999 11:20:02 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Bonanno",
"Alfio",
"",
"Catania U."
],
[
"Reuter",
"Martin",
"",
"Mainz U."
]
] | The structure of the Cauchy Horizon singularity of a black hole formed in a generic collapse is studied by means of a renormalization group equation for quantum gravity. It is shown that during the early evolution of the Cauchy Horizon the increase of the mass function is damped when quantum fluctuations of the metric ... |
1510.05088 | Baocheng Zhang | Biao Tang, Baocheng Zhang, Lin Zhou, Jin Wang, and Mingsheng Zhan | Influence of separating distance between atomic sensors for
gravitational wave detection | null | Eur. Phys. J. D (2015) 69: 233 | 10.1140/epjd/e2015-60069-8 | null | gr-qc physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a recent scheme of gravitational wave detection using atomic
interferometers as inertial sensors, and reinvestigate its configuration using
the concept of sensitivity functions. We show that such configuration can
suppress noise without influencing the gravitational wave signal. But the
suppression is ins... | [
{
"created": "Sat, 17 Oct 2015 07:33:04 GMT",
"version": "v1"
}
] | 2015-10-20 | [
[
"Tang",
"Biao",
""
],
[
"Zhang",
"Baocheng",
""
],
[
"Zhou",
"Lin",
""
],
[
"Wang",
"Jin",
""
],
[
"Zhan",
"Mingsheng",
""
]
] | We consider a recent scheme of gravitational wave detection using atomic interferometers as inertial sensors, and reinvestigate its configuration using the concept of sensitivity functions. We show that such configuration can suppress noise without influencing the gravitational wave signal. But the suppression is insuf... |
gr-qc/0407080 | Christos G. Tsagas | Christos G. Tsagas (DAMTP) | Electromagnetic fields in curved spacetimes | Minor changes, typos corrected. Published version | Class.Quant.Grav. 22 (2005) 393-408 | 10.1088/0264-9381/22/2/011 | null | gr-qc astro-ph | null | We consider the evolution of electromagnetic fields in curved spacetimes and
calculate the exact wave equations of the associated electric and magnetic
components. Our analysis is fully covariant, applies to a general spacetime and
isolates all the sources that affect the propagation of these waves. Among
others, we ... | [
{
"created": "Wed, 21 Jul 2004 14:17:19 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2004 19:41:30 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Jan 2005 15:17:46 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Tsagas",
"Christos G.",
"",
"DAMTP"
]
] | We consider the evolution of electromagnetic fields in curved spacetimes and calculate the exact wave equations of the associated electric and magnetic components. Our analysis is fully covariant, applies to a general spacetime and isolates all the sources that affect the propagation of these waves. Among others, we ex... |
gr-qc/0006016 | Vladimir Dzhunushaliev | V. Dzhunushaliev | An Approximate Model of the Spacetime Foam | essential changes: exact mathematical definitions of the spinor field
describing approximately spacetime foam is inserted | Int.J.Mod.Phys. D11 (2002) 299-310 | 10.1142/S0218271802001639 | null | gr-qc hep-th | null | An approximate model of the spacetime foam is offered in which a quantum
handle (wormhole) is a 5D wormhole-like solution. Neglecting the linear sizes
of the wormhole throat we can introduce a spinor field for an approximate and
effective description of the foam. The definition of the spinor field can be
made by a dy... | [
{
"created": "Mon, 5 Jun 2000 08:35:01 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2001 01:22:55 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Dzhunushaliev",
"V.",
""
]
] | An approximate model of the spacetime foam is offered in which a quantum handle (wormhole) is a 5D wormhole-like solution. Neglecting the linear sizes of the wormhole throat we can introduce a spinor field for an approximate and effective description of the foam. The definition of the spinor field can be made by a dyna... |
2404.15952 | Stephan Rosswog | S. Rosswog, P. Diener | SPHINCS_BSSN: Numerical Relativity with Particles | 40 pages, 11 figures; Invited chapter for the edited book "New
Frontiers in GRMHD Simulations" (Eds. C. Bambi, Y. Mizuno, S. Shashank and F.
Yuan, Springer Singapore, expected in 2024); two more frequencies added in
oscillating neutron star test | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this book chapter we describe the {\em Lagrangian} numerical relativity
code \sphi. This code evolves spacetimes in full General Relativity by
integrating the BSSN equations on structured meshes with a simple dynamical
mesh refinement strategy. The fluid is evolved by means of freely moving
Lagrangian particles, t... | [
{
"created": "Wed, 24 Apr 2024 16:14:13 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2024 07:39:18 GMT",
"version": "v2"
}
] | 2024-05-22 | [
[
"Rosswog",
"S.",
""
],
[
"Diener",
"P.",
""
]
] | In this book chapter we describe the {\em Lagrangian} numerical relativity code \sphi. This code evolves spacetimes in full General Relativity by integrating the BSSN equations on structured meshes with a simple dynamical mesh refinement strategy. The fluid is evolved by means of freely moving Lagrangian particles, tha... |
1701.04434 | Carlos A. Mar\'in V. | Carlos Rodriguez and Carlos Mar\'in | Higher-order corrections for the deflection of light around a massive
object | 24 pages, 8 figures paper to be submitted | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the Schwarzschild metric we obtain the higher-order terms (up to 20-th
order) for the deflection of light around a massive object using the
Lindstedt-Poincar\'e method to solve the equation of motion of a photon around
the stellar object. Additionally, we obtain diagonal Pad\'e approximants from
the perturbation... | [
{
"created": "Mon, 16 Jan 2017 19:38:31 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2017 19:17:41 GMT",
"version": "v2"
}
] | 2017-01-20 | [
[
"Rodriguez",
"Carlos",
""
],
[
"Marín",
"Carlos",
""
]
] | From the Schwarzschild metric we obtain the higher-order terms (up to 20-th order) for the deflection of light around a massive object using the Lindstedt-Poincar\'e method to solve the equation of motion of a photon around the stellar object. Additionally, we obtain diagonal Pad\'e approximants from the perturbation e... |
2303.06006 | Killian Martineau | Aur\'elien Barrau, Juan Garc\'ia-Bellido, Thierry Grenet and Killian
Martineau | Prospects for detection of ultra high frequency gravitational waves from
compact binary coalescenses with resonant cavities | null | null | null | null | gr-qc astro-ph.CO hep-ex hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article aims at clarifying the situation about astrophysical sources
that might be observed with haloscope experiments sensitive to gravitational
waves in the 1-10 GHz band. The GrAHal setup is taken as a benchmark. We follow
a very pedagogical path so that the full analysis can easily be used by the
entire comm... | [
{
"created": "Fri, 10 Mar 2023 16:08:42 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2024 08:14:42 GMT",
"version": "v2"
}
] | 2024-05-14 | [
[
"Barrau",
"Aurélien",
""
],
[
"García-Bellido",
"Juan",
""
],
[
"Grenet",
"Thierry",
""
],
[
"Martineau",
"Killian",
""
]
] | This article aims at clarifying the situation about astrophysical sources that might be observed with haloscope experiments sensitive to gravitational waves in the 1-10 GHz band. The GrAHal setup is taken as a benchmark. We follow a very pedagogical path so that the full analysis can easily be used by the entire commun... |
0903.1346 | Dinesh Singh | Dinesh Singh, Nader Mobed | Effects of Space-Time Curvature on Spin-1/2 Particle Zitterbewegung | 22 pages, no figures; slight revisions; accepted for publication in
Classical and Quantum Gravity | Class.Quant.Grav.26:185007,2009 | 10.1088/0264-9381/26/18/185007 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates the properties of spin-1/2 particle Zitterbewegung in
the presence of a general curved space-time background described in terms of
Fermi normal co-ordinates, where the spatial part is expressed using general
curvilinear co-ordinates. Adopting the approach first introduced by Barut and
Bracken ... | [
{
"created": "Sat, 7 Mar 2009 15:22:07 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2009 19:52:26 GMT",
"version": "v2"
}
] | 2009-09-28 | [
[
"Singh",
"Dinesh",
""
],
[
"Mobed",
"Nader",
""
]
] | This paper investigates the properties of spin-1/2 particle Zitterbewegung in the presence of a general curved space-time background described in terms of Fermi normal co-ordinates, where the spatial part is expressed using general curvilinear co-ordinates. Adopting the approach first introduced by Barut and Bracken fo... |
1610.03304 | Farhad Darabi | F. Darabi, F. Felegary and M. R. Setare | Inflation via logarithmic entropy-corrected holographic dark energy
model | 11 pages, 10 figures | Eur. Phys. J. C (2016) 76: 703 | 10.1140/epjc/s10052-016-4556-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the inflation via logarithmic entropy-corrected holographic dark
energy LECHDE model with future event horizon, particle horizon and Hubble
horizon cut-offs, and compare the results with those of obtained in the study
of inflation by holographic dark energy HDE model. In comparison, the spectrum
of primordia... | [
{
"created": "Tue, 11 Oct 2016 12:30:51 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Dec 2016 05:03:52 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Darabi",
"F.",
""
],
[
"Felegary",
"F.",
""
],
[
"Setare",
"M. R.",
""
]
] | We study the inflation via logarithmic entropy-corrected holographic dark energy LECHDE model with future event horizon, particle horizon and Hubble horizon cut-offs, and compare the results with those of obtained in the study of inflation by holographic dark energy HDE model. In comparison, the spectrum of primordial ... |
0903.3280 | Stephen Minter | Raymond Chiao, Stephen Minter, Kirk Wegter-McNelly | Laboratory-Scale Superconducting Mirrors for Gravitational Microwaves | 4 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a gravitational wave at microwave frequencies impinges on a thin, type I
superconducting film, the radical delocalization of the film's negatively
charged Cooper pairs, which is due to the Uncertainty Principle, causes them to
undergo non-geodesic motion relative to the geodesic motion of the decohered,
positive... | [
{
"created": "Thu, 19 Mar 2009 07:10:10 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Mar 2009 02:53:09 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Mar 2009 15:52:59 GMT",
"version": "v3"
}
] | 2009-03-26 | [
[
"Chiao",
"Raymond",
""
],
[
"Minter",
"Stephen",
""
],
[
"Wegter-McNelly",
"Kirk",
""
]
] | When a gravitational wave at microwave frequencies impinges on a thin, type I superconducting film, the radical delocalization of the film's negatively charged Cooper pairs, which is due to the Uncertainty Principle, causes them to undergo non-geodesic motion relative to the geodesic motion of the decohered, positively... |
gr-qc/0611035 | Paul Tod | Paul Tod | Conditions for nonexistence of static or stationary, Einstein-Maxwell,
non-inheriting black-holes | 19 pages, to appear in GERG | Gen.Rel.Grav.39:111-127,2007 | 10.1007/s10714-006-0363-5 | null | gr-qc | null | We consider asymptotically-flat, static and stationary solutions of the
Einstein equations representing Einstein-Maxwell space-times in which the
Maxwell field is not constant along the Killing vector defining stationarity,
so that the symmetry of the space-time is not inherited by the electromagnetic
field. We find ... | [
{
"created": "Sun, 5 Nov 2006 17:38:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Tod",
"Paul",
""
]
] | We consider asymptotically-flat, static and stationary solutions of the Einstein equations representing Einstein-Maxwell space-times in which the Maxwell field is not constant along the Killing vector defining stationarity, so that the symmetry of the space-time is not inherited by the electromagnetic field. We find th... |
0805.3926 | Patricio S. Letelier | Jo\~ao Paulo M. Pitelli and Patricio S. Letelier | Quantum singularities in the BTZ spacetime | 6 pages, rvtex, accepted for publication in PRD | Phys.Rev.D77:124030,2008 | 10.1103/PhysRevD.77.124030 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spinless Ba\~nados-Teiltelboim-Zanelli (BTZ) spacetime is considered in
the quantum theory context. Specially, we study the case of negative mass
parameter using quantum test particles obeying the Klein-Gordon and Dirac
equations. We study if this classical singular spacetime, with a naked
singularity at the orig... | [
{
"created": "Mon, 26 May 2008 19:53:03 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Pitelli",
"João Paulo M.",
""
],
[
"Letelier",
"Patricio S.",
""
]
] | The spinless Ba\~nados-Teiltelboim-Zanelli (BTZ) spacetime is considered in the quantum theory context. Specially, we study the case of negative mass parameter using quantum test particles obeying the Klein-Gordon and Dirac equations. We study if this classical singular spacetime, with a naked singularity at the origin... |
2209.02234 | Felix Finster | Felix Finster and J.M. Isidro | A Mechanism for Dark Matter and Dark Energy in the Theory of Causal
Fermion Systems | 24 pages, LaTeX, 1 figure, minor improvements (published version) | Class. Quantum Grav. 40 (2023) 075017 | 10.1088/1361-6382/acc0c8 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the theory of causal fermion systems gives rise to a novel
mechanism for dark matter and dark energy. This mechanism is first worked out
for cubical subsets of Minkowski space with periodic boundary conditions. Then
it is studied in Friedmann-Lema\^itre-Roberson-Walker spacetimes. The magnitude
of th... | [
{
"created": "Tue, 6 Sep 2022 06:05:42 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2023 13:45:24 GMT",
"version": "v2"
}
] | 2023-03-17 | [
[
"Finster",
"Felix",
""
],
[
"Isidro",
"J. M.",
""
]
] | It is shown that the theory of causal fermion systems gives rise to a novel mechanism for dark matter and dark energy. This mechanism is first worked out for cubical subsets of Minkowski space with periodic boundary conditions. Then it is studied in Friedmann-Lema\^itre-Roberson-Walker spacetimes. The magnitude of the ... |
gr-qc/9305011 | Peter Peldan | Peter Peldan | Actions for Gravity, with Generalizations: A Review | 61 pages, ITP 93-13 | Class.Quant.Grav.11:1087-1132,1994 | 10.1088/0264-9381/11/5/003 | null | gr-qc | null | Related to the classical Ashtekar Hamiltonian, there have been discoveries
regarding new classical actions for gravity in (2+1)- and (3+1)-dimensions, and
also generalizations of Einstein's theory of gravity. In this review, I will
try to clarify the relations between the new and old actions for gravity, and
also giv... | [
{
"created": "Thu, 13 May 1993 09:10:03 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Peldan",
"Peter",
""
]
] | Related to the classical Ashtekar Hamiltonian, there have been discoveries regarding new classical actions for gravity in (2+1)- and (3+1)-dimensions, and also generalizations of Einstein's theory of gravity. In this review, I will try to clarify the relations between the new and old actions for gravity, and also give ... |
1802.09044 | Theodosios Christodoulakis | T.Pailas, Petros A. Terzis, T. Christodoulakis | The solution space to the Einstein's vacuum field equations for the case
of five-dimensional Bianchi Type I (Type 4A1) | Latex2e source file, 18 pages no figures | null | 10.1088/1361-6382/aac847 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the 4+1 Einstein's field equations (EFE's) in vacuum, simplified
by the assumption that there is a four-dimensional sub-manifold on which an
isometry group of dimension four acts simply transitive. In particular we
consider the Abelian group Type 4A1; and thus the emerging homogeneous
sub-space is flat. T... | [
{
"created": "Sun, 25 Feb 2018 17:08:16 GMT",
"version": "v1"
}
] | 2018-07-11 | [
[
"Pailas",
"T.",
""
],
[
"Terzis",
"Petros A.",
""
],
[
"Christodoulakis",
"T.",
""
]
] | We consider the 4+1 Einstein's field equations (EFE's) in vacuum, simplified by the assumption that there is a four-dimensional sub-manifold on which an isometry group of dimension four acts simply transitive. In particular we consider the Abelian group Type 4A1; and thus the emerging homogeneous sub-space is flat. Thr... |
1304.4209 | Giovanni Modanese | R.A. Lewis, G. Modanese | Comparison of metrics from retarded integrals and transverse traceless
subgauge | 27 pages, 5 figures. Submitted to J. Math. Phys | Int. J. Mod. Phys. A 28 (2013) 1350093 | 10.1142/S0217751X13500930 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The time-varying gravitational field produced by a Weber bar is used to
explore mathematical features of the linearized Einstein equation. We present a
self-contained formal framework for the treatment of the linear field, which is
applicable to several situations where the standard quadrupolar formulas are
not adequ... | [
{
"created": "Fri, 12 Apr 2013 15:04:44 GMT",
"version": "v1"
}
] | 2013-07-17 | [
[
"Lewis",
"R. A.",
""
],
[
"Modanese",
"G.",
""
]
] | The time-varying gravitational field produced by a Weber bar is used to explore mathematical features of the linearized Einstein equation. We present a self-contained formal framework for the treatment of the linear field, which is applicable to several situations where the standard quadrupolar formulas are not adequat... |
2303.17213 | Aleksander Kozak | Aleksander Kozak, Aneta Wojnar | Planetary seismology as a test of modified gravity proposals | 11 pages, 3 figures | Phys. Rev. D 108, 044055 (2023) | 10.1103/PhysRevD.108.044055 | null | gr-qc astro-ph.EP | http://creativecommons.org/licenses/by/4.0/ | We demonstrate that it is possible to test models of gravity, such as
Palatini $f(R)$ and Eddington-inspired Born-Infeld models, using seismic data
from Earth. By incorporating additional limitations on Earth's moment of
inertia and mass given from observational data, the models' parameters can be
restricted to a $2\... | [
{
"created": "Thu, 30 Mar 2023 08:16:07 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2023 14:49:51 GMT",
"version": "v2"
}
] | 2023-08-25 | [
[
"Kozak",
"Aleksander",
""
],
[
"Wojnar",
"Aneta",
""
]
] | We demonstrate that it is possible to test models of gravity, such as Palatini $f(R)$ and Eddington-inspired Born-Infeld models, using seismic data from Earth. By incorporating additional limitations on Earth's moment of inertia and mass given from observational data, the models' parameters can be restricted to a $2\si... |
gr-qc/0511122 | Jerry B. Griffiths | J. B. Griffiths and J. Podolsky | Global aspects of accelerating and rotating black hole space-times | 15 pages, 1 figure. To appear in Class. Quantum Grav | Class.Quant.Grav. 23 (2006) 555-568 | 10.1088/0264-9381/23/2/019 | null | gr-qc | null | The complete family of exact solutions representing accelerating and rotating
black holes with possible electromagnetic charges and a NUT parameter is known
in terms of a modified Plebanski-Demianski metric. This demonstrates the
singularity and horizon structure of the sources but not that the complete
space-time de... | [
{
"created": "Tue, 22 Nov 2005 17:17:41 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Griffiths",
"J. B.",
""
],
[
"Podolsky",
"J.",
""
]
] | The complete family of exact solutions representing accelerating and rotating black holes with possible electromagnetic charges and a NUT parameter is known in terms of a modified Plebanski-Demianski metric. This demonstrates the singularity and horizon structure of the sources but not that the complete space-time desc... |
2005.01821 | Wolfgang Kastaun | Wolfgang Kastaun, Jay Vijay Kalinani, Riccardo Ciolfi | Robust Recovery of Primitive Variables in Relativistic Ideal
Magnetohydrodynamics | 18 pages, 6 figures, supplementary material at
http://doi.org/10.5281/zenodo.4075317 | Phys. Rev. D 103, 023018 (2021) | 10.1103/PhysRevD.103.023018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modern simulation codes for general relativistic ideal magnetohydrodynamics
are all facing a long standing technical problem given by the need to recover
fundamental variables from those variables that are evolved in time. In the
relativistic case, this requires the numerical solution of a system of
nonlinear equatio... | [
{
"created": "Mon, 4 May 2020 20:04:42 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jan 2021 17:50:01 GMT",
"version": "v2"
}
] | 2021-01-26 | [
[
"Kastaun",
"Wolfgang",
""
],
[
"Kalinani",
"Jay Vijay",
""
],
[
"Ciolfi",
"Riccardo",
""
]
] | Modern simulation codes for general relativistic ideal magnetohydrodynamics are all facing a long standing technical problem given by the need to recover fundamental variables from those variables that are evolved in time. In the relativistic case, this requires the numerical solution of a system of nonlinear equations... |
gr-qc/9909013 | Yungui Gong | Yungui Gong | Holographic Bound in Brans-Dicke Cosmology | Revtex, 9 pages, Some minor corrections to equations. Add one
paragraph about the Covariant Entropy Conjecture | Phys.Rev. D61 (2000) 043505 | 10.1103/PhysRevD.61.043505 | utexas-hep-99-14 | gr-qc | null | We apply the holographic principle to the Brans-Dicke cosmology. We analyze
the holographic bound in both the Jordan and Einstein frames. The holographic
bound is satisfied for both the k=0 and k=-1 universe, but it is violated for
the k=1 matter dominated universe.
| [
{
"created": "Fri, 3 Sep 1999 19:18:50 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 1999 03:35:53 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gong",
"Yungui",
""
]
] | We apply the holographic principle to the Brans-Dicke cosmology. We analyze the holographic bound in both the Jordan and Einstein frames. The holographic bound is satisfied for both the k=0 and k=-1 universe, but it is violated for the k=1 matter dominated universe. |
1604.08199 | Jonathan Engle | Jonathan Engle and Maximilian Hanusch | Kinematical uniqueness of homogeneous isotropic LQC | 7 pages, contribution to CQG focus issues on applications of loop
quantum gravity to cosmology; Citations made consistent, minor typos
corrected | Class.Quant.Grav.34: 014001, 2017 | 10.1088/0264-9381/34/1/014001 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a paper by Ashtekar and Campiglia, invariance under volume preserving
residual diffeomorphisms has been used to single out the standard
representation of the reduced holonomy-flux algebra in homogeneous loop quantum
cosmology (LQC). In this paper, we use invariance under all residual
diffeomorphisms to single out ... | [
{
"created": "Wed, 27 Apr 2016 19:49:09 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2016 18:11:55 GMT",
"version": "v2"
}
] | 2016-12-09 | [
[
"Engle",
"Jonathan",
""
],
[
"Hanusch",
"Maximilian",
""
]
] | In a paper by Ashtekar and Campiglia, invariance under volume preserving residual diffeomorphisms has been used to single out the standard representation of the reduced holonomy-flux algebra in homogeneous loop quantum cosmology (LQC). In this paper, we use invariance under all residual diffeomorphisms to single out th... |
gr-qc/9512018 | Dan Kennefick | Daniel Kennefick (Caltech) and Amos Ori (Technion, Israel) | Radiation-reaction-induced evolution of circular orbits of particles
around Kerr Black Holes | 23 pages. Revtex 3.0. Inquiries to danielk@tapir.caltech.edu | Phys.Rev. D53 (1996) 4319-4326 | 10.1103/PhysRevD.53.4319 | null | gr-qc | null | It is demonstrated that, in the adiabatic approximation, non-Equatorial
circular orbits of particles in the Kerr metric (i.e. orbits of constant
Boyer-Lindquist radius) remain circular under the influence of gravitational
radiation reaction. A brief discussion is given of conditions for breakdown of
adiabaticity and ... | [
{
"created": "Fri, 8 Dec 1995 21:02:23 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kennefick",
"Daniel",
"",
"Caltech"
],
[
"Ori",
"Amos",
"",
"Technion, Israel"
]
] | It is demonstrated that, in the adiabatic approximation, non-Equatorial circular orbits of particles in the Kerr metric (i.e. orbits of constant Boyer-Lindquist radius) remain circular under the influence of gravitational radiation reaction. A brief discussion is given of conditions for breakdown of adiabaticity and of... |
gr-qc/9705005 | M. Rainer | V. D. Ivashchuk, V. N. Melnikov, and M. Rainer | Multidimensional sigma-models with composite electric p-branes | 21 pages, LaTeX, revised for Nucl. Phys. B, new examples of solutions | Grav.Cosmol. 4 (1998) 73-82 | null | Uni-P-Math/4-5-97 | gr-qc | null | We consider a gravitational model on a manifold M = M_0 x M_1 x...x M_n with
oriented connected Einstein internal spaces M_1,...,M_n. The matter part of the
action contains several scalar fields and antisymmetric forms. With Ricci-flat
internal spaces, the model has a midisuperspace representation in form of a
sigma-... | [
{
"created": "Mon, 5 May 1997 20:48:15 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 1997 18:52:56 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Ivashchuk",
"V. D.",
""
],
[
"Melnikov",
"V. N.",
""
],
[
"Rainer",
"M.",
""
]
] | We consider a gravitational model on a manifold M = M_0 x M_1 x...x M_n with oriented connected Einstein internal spaces M_1,...,M_n. The matter part of the action contains several scalar fields and antisymmetric forms. With Ricci-flat internal spaces, the model has a midisuperspace representation in form of a sigma-mo... |
gr-qc/0204042 | Hideo Kodama | Hideo Kodama (Kyoto Univ.) | Vacuum branes in D-dimensional static spacetimes with spatial symmetry
IO(D-2), O(D-1) or O+(D-2,1) | 42 pages in LaTeX with the PTP style. No figure. Minor errors are
corrected, and notations are partially changed | Prog.Theor.Phys. 108 (2002) 253-295 | 10.1143/PTP.108.253 | null | gr-qc hep-th | null | In this paper, we give a complete classification of vacuum branes, i.e.,
everywhere umbilical time-like hypersurfaces whose extrinsic curvature is a
constant multiple of the induced metric, K_mn=k g_mn, in D-dimensional static
spacetimes with spatial symmetry G(D-2,K), where G(n,K) is the isometry group
of an n-dimen... | [
{
"created": "Fri, 12 Apr 2002 08:55:18 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Aug 2002 10:19:04 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kodama",
"Hideo",
"",
"Kyoto Univ."
]
] | In this paper, we give a complete classification of vacuum branes, i.e., everywhere umbilical time-like hypersurfaces whose extrinsic curvature is a constant multiple of the induced metric, K_mn=k g_mn, in D-dimensional static spacetimes with spatial symmetry G(D-2,K), where G(n,K) is the isometry group of an n-dimensi... |
gr-qc/9211023 | Neil Cornish | N. J. Cornish, J. W. Moffat and D. C. Tatarski | Gravitational Waves in the Nonsymmetric Gravitational Theory | 10 Pages | Phys.Lett.A173:109-115,1993 | 10.1016/0375-9601(93)90172-V | UTPT-92-18 | gr-qc | null | We prove that the flux of gravitational radiation from an isolated source in
the Nonsymmetric Gravitational Theory is identical to that found in Einstein's
General Theory of Relativity.
| [
{
"created": "Thu, 19 Nov 1992 04:06:47 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Nov 1992 17:02:23 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Cornish",
"N. J.",
""
],
[
"Moffat",
"J. W.",
""
],
[
"Tatarski",
"D. C.",
""
]
] | We prove that the flux of gravitational radiation from an isolated source in the Nonsymmetric Gravitational Theory is identical to that found in Einstein's General Theory of Relativity. |
1605.09337 | Antonino Marciano | Pietro Dona and Antonino Marciano | A note on the semiclassicality of cosmological perturbations | 17 pages | Phys. Rev. D 94, 123517 (2016) | 10.1103/PhysRevD.94.123517 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Moving from the consideration that matter fields must be treated in terms of
their fundamental quantum counterparts, we show straightforward arguments,
within the framework of ordinary quantum mechanics and quantum field theory, in
order to convince readers that cosmological perturbations must be addressed in
term of... | [
{
"created": "Mon, 30 May 2016 17:30:19 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2016 08:01:22 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Dona",
"Pietro",
""
],
[
"Marciano",
"Antonino",
""
]
] | Moving from the consideration that matter fields must be treated in terms of their fundamental quantum counterparts, we show straightforward arguments, within the framework of ordinary quantum mechanics and quantum field theory, in order to convince readers that cosmological perturbations must be addressed in term of t... |
1206.4250 | Andr\'e Gro{\ss}ardt | Domenico Giulini (1,2), Andr\'e Gro{\ss}ardt (1,2) ((1) ZARM -
University of Bremen - Germany, (2) Institute for Theoretical Physics -
University of Hannover - Germany) | The Schr\"odinger-Newton equation as non-relativistic limit of
self-gravitating Klein-Gordon and Dirac fields | 27 pages | Class. Quantum Grav. 29 (2012) 215010 | 10.1088/0264-9381/29/21/215010 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show that the Schr\"odinger-Newton equation for spherically
symmetric gravitational fields can be derived in a WKB-like expansion in 1/c
from the Einstein-Klein-Gordon and Einstein-Dirac system.
| [
{
"created": "Tue, 19 Jun 2012 16:05:27 GMT",
"version": "v1"
}
] | 2012-10-08 | [
[
"Giulini",
"Domenico",
""
],
[
"Großardt",
"André",
""
]
] | In this paper we show that the Schr\"odinger-Newton equation for spherically symmetric gravitational fields can be derived in a WKB-like expansion in 1/c from the Einstein-Klein-Gordon and Einstein-Dirac system. |
1303.5612 | Timothy Clifton | Timothy Clifton, George F R Ellis and Reza Tavakol | A Gravitational Entropy Proposal | 17 pages | Class. Quant. Grav. 30 (2013) 125009 | 10.1088/0264-9381/30/12/125009 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a thermodynamically motivated measure of gravitational entropy
based on the Bel-Robinson tensor, which has a natural interpretation as the
effective super-energy-momentum tensor of free gravitational fields. The
specific form of this measure differs depending on whether the gravitational
field is Coulomb-l... | [
{
"created": "Fri, 22 Mar 2013 13:29:55 GMT",
"version": "v1"
},
{
"created": "Mon, 20 May 2013 08:54:13 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Clifton",
"Timothy",
""
],
[
"Ellis",
"George F R",
""
],
[
"Tavakol",
"Reza",
""
]
] | We propose a thermodynamically motivated measure of gravitational entropy based on the Bel-Robinson tensor, which has a natural interpretation as the effective super-energy-momentum tensor of free gravitational fields. The specific form of this measure differs depending on whether the gravitational field is Coulomb-lik... |
2407.17400 | Jos\'e A. Zapata | Juan Orendain and Jose A. Zapata | A better space of generalized connections | Prepared for the Proceedings of MG17 | null | null | null | gr-qc hep-lat | http://creativecommons.org/licenses/by/4.0/ | Given a base manifold $M$ and a Lie group $G$, we define $\widetilde{\cal
A}_M$ a space of generalized $G$-connections on $M$ with the following
properties:
- The space of smooth connections ${\cal A}^\infty_M = \sqcup_\pi {\cal
A}^\infty_\pi$ is densely embedded in $\widetilde{\cal A}_M = \sqcup_\pi
\widetilde{\ca... | [
{
"created": "Wed, 24 Jul 2024 16:24:26 GMT",
"version": "v1"
}
] | 2024-07-25 | [
[
"Orendain",
"Juan",
""
],
[
"Zapata",
"Jose A.",
""
]
] | Given a base manifold $M$ and a Lie group $G$, we define $\widetilde{\cal A}_M$ a space of generalized $G$-connections on $M$ with the following properties: - The space of smooth connections ${\cal A}^\infty_M = \sqcup_\pi {\cal A}^\infty_\pi$ is densely embedded in $\widetilde{\cal A}_M = \sqcup_\pi \widetilde{\cal A}... |
gr-qc/9809033 | Kjell Rosquist | Kjell Rosquist | Trapped gravitational wave modes in stars with R>3M | 10 pages, 3 figures, LaTeX2e | Phys. Rev. D 59, 044022 (1999) | 10.1103/PhysRevD.59.044022 | USITP 98-16 | gr-qc astro-ph | null | The possibility of trapped modes of gravitational waves appearing in stars
with R>3M is considered. It is shown that the restriction to R<3M in previous
studies of trapped modes, using uniform density models, is not essential.
Scattering potentials are computed for another family of analytic stellar
models showing th... | [
{
"created": "Tue, 8 Sep 1998 14:17:22 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Rosquist",
"Kjell",
""
]
] | The possibility of trapped modes of gravitational waves appearing in stars with R>3M is considered. It is shown that the restriction to R<3M in previous studies of trapped modes, using uniform density models, is not essential. Scattering potentials are computed for another family of analytic stellar models showing the ... |
2108.09900 | L.L. Williams | Y. Balytskyi, D. Hoyer, A.O. Pinchuk, L.L. Williams | A new class of monopole solutions in five-dimensional general relativity
and the role of negative scalar field energy in vacuum solutions | 12 pages, 1 table, no figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Using numerical algebra tools, new classes of monopole solutions are obtained
to the static, spherically-symmetric vacuum field equations of five-dimensional
general relativity. First proposed by Kaluza, 5D general relativity unites
gravity and classical electromagnetism with a scalar field. These monopoles
correspon... | [
{
"created": "Mon, 23 Aug 2021 02:35:53 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 2021 02:03:21 GMT",
"version": "v2"
}
] | 2021-09-14 | [
[
"Balytskyi",
"Y.",
""
],
[
"Hoyer",
"D.",
""
],
[
"Pinchuk",
"A. O.",
""
],
[
"Williams",
"L. L.",
""
]
] | Using numerical algebra tools, new classes of monopole solutions are obtained to the static, spherically-symmetric vacuum field equations of five-dimensional general relativity. First proposed by Kaluza, 5D general relativity unites gravity and classical electromagnetism with a scalar field. These monopoles correspond ... |
1912.06340 | Hideki Asada | Yuki Hagihara, Naoya Era, Daisuke Iikawa, Naohiro Takeda, Hideki Asada | Condition for directly testing scalar modes of gravitational waves by
four detectors | 6 pages, 4 figures, 2 tables, adding discussions on a fifth detector
(LIGO-India), accepted by PRD (as a Rapid Communication) | Phys. Rev. D 101, 041501 (2020) | 10.1103/PhysRevD.101.041501 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General metric theories in a four-dimensional spacetime allow at most six
polarization states (two spin-0, two spin-1 and two spin-2) of gravitational
waves (GWs). If a sky location of a GW source with the electromagnetic
counterpart satisfies a single equation that we propose in this paper, both the
spin-1 modes and... | [
{
"created": "Fri, 13 Dec 2019 06:56:40 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2020 06:01:25 GMT",
"version": "v2"
}
] | 2020-03-04 | [
[
"Hagihara",
"Yuki",
""
],
[
"Era",
"Naoya",
""
],
[
"Iikawa",
"Daisuke",
""
],
[
"Takeda",
"Naohiro",
""
],
[
"Asada",
"Hideki",
""
]
] | General metric theories in a four-dimensional spacetime allow at most six polarization states (two spin-0, two spin-1 and two spin-2) of gravitational waves (GWs). If a sky location of a GW source with the electromagnetic counterpart satisfies a single equation that we propose in this paper, both the spin-1 modes and s... |
2209.08404 | Carsten Gundlach | Bernardo Porto Veronese and Carsten Gundlach | Critical phenomena in gravitational collapse with competing scalar field
and gravitational waves, in 4+1 dimensions | null | null | 10.1103/PhysRevD.106.104044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the gravitational collapse of matter beyond spherical symmetry,
gravitational waves are necessarily present. On the other hand, gravitational
waves can collapse to a black hole even without matter. One might therefore
wonder how the interaction and competition between the matter fields and
gravitational waves affe... | [
{
"created": "Sat, 17 Sep 2022 21:14:07 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Veronese",
"Bernardo Porto",
""
],
[
"Gundlach",
"Carsten",
""
]
] | In the gravitational collapse of matter beyond spherical symmetry, gravitational waves are necessarily present. On the other hand, gravitational waves can collapse to a black hole even without matter. One might therefore wonder how the interaction and competition between the matter fields and gravitational waves affect... |
1608.02202 | Christopher Pope | M. Cvetic, G.W. Gibbons and C.N. Pope | Photon Spheres and Sonic Horizons in Black Holes from Supergravity and
Other Theories | References added, higher-dimensional inequalities added. 45 pages, 3
figures | Phys. Rev. D 94, 106005 (2016) | 10.1103/PhysRevD.94.106005 | UPR-1280-T, MI-TH-1623 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study closed photon orbits in spherically-symmetric static solutions of
supergravity theories, a Horndeski theory, and a theory of quintessence. These
orbits lie in what we shall call a photon sphere (anti-photon sphere) if the
orbit is unstable (stable). We show that in all the asymptotically flat
solutions we ex... | [
{
"created": "Sun, 7 Aug 2016 10:35:10 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2016 22:38:35 GMT",
"version": "v2"
}
] | 2019-04-26 | [
[
"Cvetic",
"M.",
""
],
[
"Gibbons",
"G. W.",
""
],
[
"Pope",
"C. N.",
""
]
] | We study closed photon orbits in spherically-symmetric static solutions of supergravity theories, a Horndeski theory, and a theory of quintessence. These orbits lie in what we shall call a photon sphere (anti-photon sphere) if the orbit is unstable (stable). We show that in all the asymptotically flat solutions we exam... |
gr-qc/9905013 | Guillermo Arreaga | Tonatiuh Matos, Guillermo Arreaga and Gabriela Piccinelli | Inflation from an effective standard model of particle physics for
curved space-time | 15 pages, 2 figures. Accepted for publication in International
Journal of Modern Physics D | Int.J.Mod.Phys. D8 (1999) 337-347 | 10.1142/S0218271899000250 | null | gr-qc | null | Beginning from an effective theory in eight dimensions, Macias, Camacho and
Matos proposed an effective model for the electroweak part of the Standard
Model of particles in curved spacetime. Using this model, we investigate the
cosmological consequences of the electroweak interaction in the early universe.
We use the... | [
{
"created": "Wed, 5 May 1999 19:50:04 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Matos",
"Tonatiuh",
""
],
[
"Arreaga",
"Guillermo",
""
],
[
"Piccinelli",
"Gabriela",
""
]
] | Beginning from an effective theory in eight dimensions, Macias, Camacho and Matos proposed an effective model for the electroweak part of the Standard Model of particles in curved spacetime. Using this model, we investigate the cosmological consequences of the electroweak interaction in the early universe. We use the a... |
gr-qc/9612034 | Gianni Landi | Giovanni Landi, Carlo Rovelli | General Relativity in terms of Dirac Eigenvalues | 6 pages, RevTex | Phys.Rev.Lett. 78 (1997) 3051-3054 | 10.1103/PhysRevLett.78.3051 | null | gr-qc hep-th | null | The eigenvalues of the Dirac operator on a curved spacetime are
diffeomorphism-invariant functions of the geometry. They form an infinite set
of ``observables'' for general relativity. Recent work of Chamseddine and
Connes suggests that they can be taken as variables for an invariant
description of the gravitational ... | [
{
"created": "Fri, 13 Dec 1996 11:21:10 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Landi",
"Giovanni",
""
],
[
"Rovelli",
"Carlo",
""
]
] | The eigenvalues of the Dirac operator on a curved spacetime are diffeomorphism-invariant functions of the geometry. They form an infinite set of ``observables'' for general relativity. Recent work of Chamseddine and Connes suggests that they can be taken as variables for an invariant description of the gravitational fi... |
0809.5148 | Norbert Straumann | Norbert Straumann | Problems with Modified Theories of Gravity, as Alternatives to Dark
Energy | 20 pages, 4 figures, Invited talk at the conference "BEYOND
EINSTEIN", Mainz, 22 -- 26 September, 2008 | null | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution to the conference "Beyond Einstein: Historical
Perspectives on Geometry, Gravitation and Cosmology in the Twentieth Century",
we give a critical status report of attempts to explain the late accelerated
expansion of the universe by modifications of general relativity. Our brief
review of such alt... | [
{
"created": "Tue, 30 Sep 2008 09:38:38 GMT",
"version": "v1"
}
] | 2008-10-02 | [
[
"Straumann",
"Norbert",
""
]
] | In this contribution to the conference "Beyond Einstein: Historical Perspectives on Geometry, Gravitation and Cosmology in the Twentieth Century", we give a critical status report of attempts to explain the late accelerated expansion of the universe by modifications of general relativity. Our brief review of such alter... |
2003.06232 | Sean Julian Fortuna | Sean Fortuna and Ian Vega | Bernstein spectral method for quasinormal modes and other eigenvalue
problems | 46 pages, 9 figures added references, changed format, reorganized
sections to enhance flow of discussions, improved the subsection discussing
the subtleties in computing the ASM, strengthened discussion on the QHO,
edits to graphs so that they are readable in black and white, fixed some
typos | Eur. Phys. J. C 83, 1170 (2023) | 10.1140/epjc/s10052-023-12350-9 | null | gr-qc physics.comp-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spectral methods are now common in the solution of ordinary differential
eigenvalue problems in a wide variety of fields, such as in the computation of
black hole quasinormal modes. Most of these spectral codes are based on
standard Chebyshev, Fourier, or some other orthogonal basis functions. In this
work we highlig... | [
{
"created": "Fri, 13 Mar 2020 12:30:18 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Nov 2021 08:30:58 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jan 2024 06:04:19 GMT",
"version": "v3"
}
] | 2024-01-18 | [
[
"Fortuna",
"Sean",
""
],
[
"Vega",
"Ian",
""
]
] | Spectral methods are now common in the solution of ordinary differential eigenvalue problems in a wide variety of fields, such as in the computation of black hole quasinormal modes. Most of these spectral codes are based on standard Chebyshev, Fourier, or some other orthogonal basis functions. In this work we highlight... |
1909.07298 | Mark Bugden | Mark Bugden | Trapped photons in Schwarzschild-Tangherlini spacetimes | 6 pages, comments welcome | null | 10.1088/1361-6382/ab5493 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the set of trapped photons outside the event horizon of
Schwarzschild-Tangherlini black holes in dimension $d\geq4$. We prove that the
only trapped photons are those with constant Boyer-Lindquist coordinate radius.
We then identify the set of trapped photons as a submanifold of the tangent
bundle of the spac... | [
{
"created": "Mon, 16 Sep 2019 15:55:40 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Bugden",
"Mark",
""
]
] | We study the set of trapped photons outside the event horizon of Schwarzschild-Tangherlini black holes in dimension $d\geq4$. We prove that the only trapped photons are those with constant Boyer-Lindquist coordinate radius. We then identify the set of trapped photons as a submanifold of the tangent bundle of the spacet... |
1412.8368 | David Garfinkle | David Garfinkle | Matters of Gravity, The Newsletter of the Topical Group on Gravitation
of the American Physical Society, Volume 44, December 2014 | conference report added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GGR News:
we hear that...
GR Centenial Speakers Bureau
GGR $\to$ DGR
GGR program at the APS meeting in Baltimore, MD
Conference reports:
New Frontiers in Dynamical Gravity
Frontiers of Neutron Star Astrophysics
Quantum Information in Quantum Gravity
| [
{
"created": "Mon, 22 Dec 2014 14:01:57 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2014 17:01:04 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Jan 2015 20:06:44 GMT",
"version": "v3"
}
] | 2015-01-06 | [
[
"Garfinkle",
"David",
""
]
] | GGR News: we hear that... GR Centenial Speakers Bureau GGR $\to$ DGR GGR program at the APS meeting in Baltimore, MD Conference reports: New Frontiers in Dynamical Gravity Frontiers of Neutron Star Astrophysics Quantum Information in Quantum Gravity |
1701.04235 | Soumya Chakrabarti | Narayan Banerjee and Soumya Chakrabarti | Self-similar scalar field collapse | null | Phys. Rev. D. 95, 024015, (2017) | 10.1103/PhysRevD.95.024015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spherically symmetric collapsing scalar field model is discussed with a
dissipative fluid which includes a heat flux. This vastly general matter
distribution is analyzed at the expense of a high degree of symmetry in the
space-time, that of conformal flatness and self-similarity. Indeed collapsing
models terminatin... | [
{
"created": "Mon, 16 Jan 2017 10:49:31 GMT",
"version": "v1"
}
] | 2017-01-17 | [
[
"Banerjee",
"Narayan",
""
],
[
"Chakrabarti",
"Soumya",
""
]
] | A spherically symmetric collapsing scalar field model is discussed with a dissipative fluid which includes a heat flux. This vastly general matter distribution is analyzed at the expense of a high degree of symmetry in the space-time, that of conformal flatness and self-similarity. Indeed collapsing models terminating ... |
1006.1583 | Jiri Podolsky | Jiri Podolsky | Photon rockets moving arbitrarily in any dimension | Text and figures modified (22 pages, 8 figures). To appear in the
International Journal of Modern Physics D, Vol. 20, No.. 3 | Int.J.Mod.Phys.D20:335-360,2011 | 10.1142/S0218271811018846 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A family of explicit exact solutions of Einstein's equations in four and
higher dimensions is studied which describes photon rockets accelerating due to
an anisotropic emission of photons. It is possible to prescribe an arbitrary
motion, so that the acceleration of the rocket need not be uniform - both its
magnitude ... | [
{
"created": "Tue, 8 Jun 2010 15:11:18 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2011 17:49:07 GMT",
"version": "v2"
}
] | 2011-04-07 | [
[
"Podolsky",
"Jiri",
""
]
] | A family of explicit exact solutions of Einstein's equations in four and higher dimensions is studied which describes photon rockets accelerating due to an anisotropic emission of photons. It is possible to prescribe an arbitrary motion, so that the acceleration of the rocket need not be uniform - both its magnitude an... |
gr-qc/0009004 | John G. Ratcliffe | John G. Ratcliffe and Steven T. Tschantz | On the Growth of the Number of Hyperbolic Gravitational Instantons with
respect to Volume | 9 pages and 2 tables | Class.Quant.Grav. 17 (2000) 2999-3007 | 10.1088/0264-9381/17/15/310 | null | gr-qc | null | In this paper, we show that the number of hyperbolic gravitational instantons
grows superexponentially with respect to volume. As an application, we show
that the Hartle-Hawking wave function for the universe is infinitely peaked at
a certain closed hyperbolic 3-manifold.
| [
{
"created": "Fri, 1 Sep 2000 21:24:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ratcliffe",
"John G.",
""
],
[
"Tschantz",
"Steven T.",
""
]
] | In this paper, we show that the number of hyperbolic gravitational instantons grows superexponentially with respect to volume. As an application, we show that the Hartle-Hawking wave function for the universe is infinitely peaked at a certain closed hyperbolic 3-manifold. |
2312.11912 | Xin Lyu | Xin Lyu, Jun Tao, and Peng Wang | Probing the thermodynamics of charged Gauss Bonnet AdS black holes with
the Lyapunov exponent | null | null | null | CTP-SCU/2023039 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the thermodynamic properties of charged AdS
Gauss-Bonnet black holes and the associations with the Lyapunov exponent. The
chaotic features of the black holes and the isobaric heat capacity
characterized by Lyapunov exponent are studied to reveal the stability of black
hole phases. With t... | [
{
"created": "Tue, 19 Dec 2023 07:44:38 GMT",
"version": "v1"
}
] | 2023-12-20 | [
[
"Lyu",
"Xin",
""
],
[
"Tao",
"Jun",
""
],
[
"Wang",
"Peng",
""
]
] | In this paper, we investigate the thermodynamic properties of charged AdS Gauss-Bonnet black holes and the associations with the Lyapunov exponent. The chaotic features of the black holes and the isobaric heat capacity characterized by Lyapunov exponent are studied to reveal the stability of black hole phases. With the... |
1611.03476 | Sunil Kumar Tripathy Dr. | S K Sahu, S K Tripathy, P K Sahoo and A Nath | Cosmic Transit and Anisotropic Models in f(R,T) Gravity | 13 pages, 4 figures | Chinese Journal of Physics, 55, (2017) 862-869 | 10.1016/j.cjph.2017.02.013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accelerating cosmological models are constructed in a modified gravity theory
dubbed as $f(R,T)$ gravity at the backdrop of an anisotropic Bianchi type-III
universe. $f(R,T)$ is a function of the Ricci scalar $R$ and the trace $T$ of
the energy-momentum tensor and it replaces the Ricci scalar in the
Einstein-Hilbert ... | [
{
"created": "Tue, 8 Nov 2016 02:36:54 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jun 2017 14:28:47 GMT",
"version": "v2"
}
] | 2017-06-21 | [
[
"Sahu",
"S K",
""
],
[
"Tripathy",
"S K",
""
],
[
"Sahoo",
"P K",
""
],
[
"Nath",
"A",
""
]
] | Accelerating cosmological models are constructed in a modified gravity theory dubbed as $f(R,T)$ gravity at the backdrop of an anisotropic Bianchi type-III universe. $f(R,T)$ is a function of the Ricci scalar $R$ and the trace $T$ of the energy-momentum tensor and it replaces the Ricci scalar in the Einstein-Hilbert ac... |
1904.12425 | Marcus Khuri | Aghil Alaee, Marcus Khuri, Hari Kunduri | Existence and Uniqueness of Stationary Solutions in 5-Dimensional
Minimal Supergravity | 43 pages, final version | null | null | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the problem of stationary bi-axially symmetric solutions of the
$5$-dimensional minimal supergravity equations. Essentially all possible
solutions with nondegenerate horizons are produced, having the allowed horizon
cross-sectional topologies of the sphere $S^3$, ring $S^1\times S^2$, and lens
$L(p,q)$, as w... | [
{
"created": "Mon, 29 Apr 2019 02:24:41 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2023 06:56:03 GMT",
"version": "v2"
}
] | 2023-01-06 | [
[
"Alaee",
"Aghil",
""
],
[
"Khuri",
"Marcus",
""
],
[
"Kunduri",
"Hari",
""
]
] | We study the problem of stationary bi-axially symmetric solutions of the $5$-dimensional minimal supergravity equations. Essentially all possible solutions with nondegenerate horizons are produced, having the allowed horizon cross-sectional topologies of the sphere $S^3$, ring $S^1\times S^2$, and lens $L(p,q)$, as wel... |
0805.0421 | Pieter Miedema | P.G.Miedema | Structure Formation independent of Cold Dark Matter | 73 pages, 4 figures. Conclusions unchanged. Sections X-D and XIII-C
partly rewritten. Added Eqs.(90), (95), (151), (157). In order to verify the
main equations (203) and (207) with a computer algebra program, a Maple-file
is added | null | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that a first-order cosmological perturbation theory for
Friedmann-Lemaitre-Robertson-Walker universes admits one and only one
gauge-invariant variable which describes the perturbation to the energy density
and which becomes equal to the usual energy density of the Newtonian theory of
gravity in the limit ... | [
{
"created": "Sun, 4 May 2008 14:44:00 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Apr 2009 12:03:17 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Jul 2009 12:53:14 GMT",
"version": "v3"
},
{
"created": "Sat, 6 Feb 2010 15:27:13 GMT",
"version": "v4"
},
{
"crea... | 2015-03-13 | [
[
"Miedema",
"P. G.",
""
]
] | It is shown that a first-order cosmological perturbation theory for Friedmann-Lemaitre-Robertson-Walker universes admits one and only one gauge-invariant variable which describes the perturbation to the energy density and which becomes equal to the usual energy density of the Newtonian theory of gravity in the limit th... |
2011.03601 | Jordan Wilson-Gerow | A.O. Barvinsky, J. Wilson-Gerow, P.C.E. Stamp | Correlated Worldline theory: Structure and Consistency | 20 pages, 6 figures | Phys. Rev. D 103, 064028 (2021) | 10.1103/PhysRevD.103.064028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a formal treatment of the "Correlated Worldline" theory of quantum
gravity. The generating functional is written as a product over multiple copies
of the coupled matter and gravitational fields; paths for fields are correlated
via gravity itself. In the limit where the gravitational coupling $G
\rightarrow 0$... | [
{
"created": "Fri, 6 Nov 2020 21:28:00 GMT",
"version": "v1"
}
] | 2021-03-24 | [
[
"Barvinsky",
"A. O.",
""
],
[
"Wilson-Gerow",
"J.",
""
],
[
"Stamp",
"P. C. E.",
""
]
] | We give a formal treatment of the "Correlated Worldline" theory of quantum gravity. The generating functional is written as a product over multiple copies of the coupled matter and gravitational fields; paths for fields are correlated via gravity itself. In the limit where the gravitational coupling $G \rightarrow 0$, ... |
1604.01368 | L. C. Garcia de Andrade | Garcia de Andrade | Early Universe Dynamos from Neutrino Oscillations Induced by Torsion | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Earlier de Sabbata and Gasperini have shown that neutrinos oscillation which
gives them a mass can be induced by torsion. More recently Enqvist et al have
shown that it is possible to use massive neutrinos BBN magnetic fields to seed
galactic magnetic fields. Thus based on these previous investigations we
present sev... | [
{
"created": "Sun, 3 Apr 2016 22:47:42 GMT",
"version": "v1"
}
] | 2016-04-06 | [
[
"de Andrade",
"Garcia",
""
]
] | Earlier de Sabbata and Gasperini have shown that neutrinos oscillation which gives them a mass can be induced by torsion. More recently Enqvist et al have shown that it is possible to use massive neutrinos BBN magnetic fields to seed galactic magnetic fields. Thus based on these previous investigations we present sever... |
0706.0622 | Matt Visser | Matt Visser (Victoria University of Wellington) | The Kerr spacetime: A brief introduction | V2: 41 pages, 3 figures: Introductory chapter on the Kerr spacetime
that is intended for use in the book "The Kerr spacetime", currently being
edited by Susan Scott, Matt Visser, and David Wiltshire. It is not, nor is it
intended to be, complete and exhaustive. 3 references added. 2 figures added.
some typos fi... | null | null | null | gr-qc astro-ph hep-th | null | This chapter provides a brief introduction to the Kerr spacetime and rotating
black holes, touching on the most common coordinate representations of the
spacetime metric and the key features of the geometry -- the presence of
horizons and ergospheres. The coverage is by no means complete, and serves
chiefly to orient... | [
{
"created": "Tue, 5 Jun 2007 11:10:07 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jun 2007 10:17:27 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Jan 2008 02:12:42 GMT",
"version": "v3"
}
] | 2008-01-15 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | This chapter provides a brief introduction to the Kerr spacetime and rotating black holes, touching on the most common coordinate representations of the spacetime metric and the key features of the geometry -- the presence of horizons and ergospheres. The coverage is by no means complete, and serves chiefly to orient o... |
gr-qc/0703004 | V. Folomeev | Vladimir Folomeev | Bianchi type I model with two interacting scalar fields | 6 pages, 1 figure | Int.J.Mod.Phys.D16:1845-1852,2007 | 10.1142/S0218271807011139 | null | gr-qc | null | The flat anisotropic model of the early Universe is considered. Two
interacting scalar fields with special form of potential energy are a source of
matter fields. Analytic solutions for inflationary and scalaron stages are
found. It is shown that the solutions tend asymptotically to isotropic
Friedmann model.
| [
{
"created": "Thu, 1 Mar 2007 12:14:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Folomeev",
"Vladimir",
""
]
] | The flat anisotropic model of the early Universe is considered. Two interacting scalar fields with special form of potential energy are a source of matter fields. Analytic solutions for inflationary and scalaron stages are found. It is shown that the solutions tend asymptotically to isotropic Friedmann model. |
1208.1071 | David Mattingly | Stefano Liberati and David Mattingly | Lorentz breaking effective field theory models for matter and gravity:
theory and observational constraints | 48 pages. Chapter contribution to "Gravity: Where do we stand?",
proceedings of the 2009 SIGRAV Graduate School in Contemporary Relativity and
Gravitational Physics. Certain pedagogical parts overlap with
http://arxiv.org/abs/arXiv:1203.4105 | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A number of different approaches to quantum gravity are at least partly
phenomenologically characterized by their treatment of Lorentz symmetry, in
particular whether the symmetry is exact or modified/broken at the smallest
scales. For example, string theory generally preserves Lorentz symmetry while
analog gravity a... | [
{
"created": "Mon, 6 Aug 2012 02:44:13 GMT",
"version": "v1"
}
] | 2012-08-16 | [
[
"Liberati",
"Stefano",
""
],
[
"Mattingly",
"David",
""
]
] | A number of different approaches to quantum gravity are at least partly phenomenologically characterized by their treatment of Lorentz symmetry, in particular whether the symmetry is exact or modified/broken at the smallest scales. For example, string theory generally preserves Lorentz symmetry while analog gravity and... |
2101.04747 | Ahmed Farag Ali | Mohamed Moussa, Homa Shababi, Ahmed Farag Ali | Generalized uncertainty principle and stochastic gravitational wave
background spectrum | 10 pages, 7 figures, revtex4, to appear in Physics Letters B | Phys.Lett. B814 (2021) 136071 | 10.1016/j.physletb.2021.136071 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | This paper concerned with the effect of generalized uncertainty principle
(GUP) on the stochastic gravitational wave (SGW) background signal that
produced during first order cosmological QCD phase transition in early
universe. A modified formula of entropy is used to calculate the temporal
evolution of temperature of... | [
{
"created": "Thu, 7 Jan 2021 01:12:48 GMT",
"version": "v1"
}
] | 2021-01-22 | [
[
"Moussa",
"Mohamed",
""
],
[
"Shababi",
"Homa",
""
],
[
"Ali",
"Ahmed Farag",
""
]
] | This paper concerned with the effect of generalized uncertainty principle (GUP) on the stochastic gravitational wave (SGW) background signal that produced during first order cosmological QCD phase transition in early universe. A modified formula of entropy is used to calculate the temporal evolution of temperature of t... |
gr-qc/0410142 | Nora Breton | Ricardo Garcia-Salcedo and Nora Breton | Singularity-free Bianchi spaces with nonlinear electrodynamics | 10 pages, 3 figures | Class.Quant.Grav. 22 (2005) 4783-4802 | 10.1088/0264-9381/22/22/009 | null | gr-qc | null | In this paper we present an analysis to determine the existence of
singularities in spatially homogeneous anisotropic universes filled with
nonlinear electromagnetic radiation. These spaces are conformal to Bianchi
spaces admitting a three parameter group of motions G$_3$. For these models we
study geodesic completen... | [
{
"created": "Thu, 28 Oct 2004 15:06:52 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2005 14:51:26 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Garcia-Salcedo",
"Ricardo",
""
],
[
"Breton",
"Nora",
""
]
] | In this paper we present an analysis to determine the existence of singularities in spatially homogeneous anisotropic universes filled with nonlinear electromagnetic radiation. These spaces are conformal to Bianchi spaces admitting a three parameter group of motions G$_3$. For these models we study geodesic completenes... |
1502.01189 | Behnam Pourhassan | E.O. Kahya, B. Pourhassan | The universe dominated by the extended Chaplygin gas | 17 pages. Accepted in MPLA | Modern Physics Letters A Vol. 30, No. 13 (2015) 1550070 | 10.1142/S0217732315500704 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider a universe dominated by the extended Chaplygin gas
which recently proposed as the last version of Chaplygin gas models. Here, we
only consider the second order term which recovers quadratic barotropic fluid
equation of state. The density perturbations analyzed in both relativistic and
Newto... | [
{
"created": "Wed, 4 Feb 2015 13:26:58 GMT",
"version": "v1"
}
] | 2015-04-01 | [
[
"Kahya",
"E. O.",
""
],
[
"Pourhassan",
"B.",
""
]
] | In this paper, we consider a universe dominated by the extended Chaplygin gas which recently proposed as the last version of Chaplygin gas models. Here, we only consider the second order term which recovers quadratic barotropic fluid equation of state. The density perturbations analyzed in both relativistic and Newtoni... |
gr-qc/0001073 | Valentin D. Gladush | V.D. Gladush | On the variational principle for dust shells in General Relativity | 25 pages, RevTeX, no figures, revised version, typos corrected,
accepted for publication in Journal of Mathematical Physics | J.Math.Phys.42:2590-2610,2001 | 10.1063/1.1369123 | null | gr-qc hep-th | null | The variational principle for a thin dust shell in General Relativity is
constructed. The principle is compatible with the boundary-value problem of the
corresponding Euler-Lagrange equations, and leads to ``natural boundary
conditions'' on the shell. These conditions and the gravitational field
equations which follo... | [
{
"created": "Mon, 24 Jan 2000 13:52:53 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Oct 2000 15:43:54 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Mar 2001 18:02:07 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Gladush",
"V. D.",
""
]
] | The variational principle for a thin dust shell in General Relativity is constructed. The principle is compatible with the boundary-value problem of the corresponding Euler-Lagrange equations, and leads to ``natural boundary conditions'' on the shell. These conditions and the gravitational field equations which follow ... |
2202.13875 | Gianluca Calcagni | Gianluca Calcagni, Maria Grazia Di Luca, Tom\'a\v{s} Fodran | Lectures on classical and quantum cosmology | 64 pages. Lecture notes of the Corfu Summer Institute 2021 "School
and Workshops on Elementary Particle Physics and Gravity", 29 August - 9
October 2021, Corfu, Greece. v2: plots updated, minor typos corrected,
references added; v3: further minor typos corrected | PoS(CORFU2021)317 | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These lecture notes introduce the reader to the hot big bang model,
cosmological perturbations, gravitational waves, the cosmic microwave
background, inflation, the singularity problem, the cosmological constant
problem and the cosmology of quantum gravity.
| [
{
"created": "Mon, 28 Feb 2022 15:23:59 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2022 21:55:14 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Aug 2022 05:55:31 GMT",
"version": "v3"
}
] | 2022-08-17 | [
[
"Calcagni",
"Gianluca",
""
],
[
"Di Luca",
"Maria Grazia",
""
],
[
"Fodran",
"Tomáš",
""
]
] | These lecture notes introduce the reader to the hot big bang model, cosmological perturbations, gravitational waves, the cosmic microwave background, inflation, the singularity problem, the cosmological constant problem and the cosmology of quantum gravity. |
gr-qc/9904038 | Zieba Pawel | W. Rudnicki, P. Zieba | Curvature conditions for the occurrence of a class of spacetime
singularities | RevTeX, 6 pages, no figures. To be published in J. Math. Phys | J. Math. Phys. 40 (1999) 3084-3090 | 10.1063/1.532746 | null | gr-qc | null | It has previously been shown [W. Rudnicki, Phys. Lett. A 224, 45 (1996)] that
a generic gravitational collapse cannot result in a naked singularity
accompanied by closed timelike curves. An important role in this result plays
the so-called inextendibility condition, which is required to hold for certain
incomplete nu... | [
{
"created": "Thu, 15 Apr 1999 13:02:32 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Rudnicki",
"W.",
""
],
[
"Zieba",
"P.",
""
]
] | It has previously been shown [W. Rudnicki, Phys. Lett. A 224, 45 (1996)] that a generic gravitational collapse cannot result in a naked singularity accompanied by closed timelike curves. An important role in this result plays the so-called inextendibility condition, which is required to hold for certain incomplete null... |
2408.00044 | Llibert Arest\'e Sal\'o | Llibert Arest\'e Sal\'o | Strong gravity beyond General Relativity | Ph.D. thesis; Supervisor: Pau Figueras; 131 pages, 25 figures, 6
tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis focuses on the application of numerical relativity methods to the
solutions of problems in strong gravity. Our goal is the study of mergers of
compact objects in the strong field regime where non-linear dynamics manifest
and deviations from General Relativity could be found. We develop a new
formulation o... | [
{
"created": "Wed, 31 Jul 2024 14:55:30 GMT",
"version": "v1"
}
] | 2024-08-02 | [
[
"Saló",
"Llibert Aresté",
""
]
] | This thesis focuses on the application of numerical relativity methods to the solutions of problems in strong gravity. Our goal is the study of mergers of compact objects in the strong field regime where non-linear dynamics manifest and deviations from General Relativity could be found. We develop a new formulation of ... |
0807.3691 | Anatoliy Prykarpatsky | Anatoliy K. Prykarpatsky and Nikolai N. Bogolubov Jr | The Field Structure of Vacuum, Maxwell Equations and Relativity Theory
Aspects. Part 1 | 11 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nature of space-time and surrounding matter objects was and persists to
be a one of the most intriguing and challenging problems facing the mankind and
natural scientists especially. As we know one of the most brilliant inventions
in physics of XIX-th century was combining of electricity and magnetism within
the ... | [
{
"created": "Wed, 23 Jul 2008 15:01:22 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jul 2008 08:40:28 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jul 2008 13:43:42 GMT",
"version": "v3"
},
{
"created": "Sat, 26 Jul 2008 22:36:50 GMT",
"version": "v4"
},
{
"c... | 2008-10-26 | [
[
"Prykarpatsky",
"Anatoliy K.",
""
],
[
"Bogolubov",
"Nikolai N.",
"Jr"
]
] | The nature of space-time and surrounding matter objects was and persists to be a one of the most intriguing and challenging problems facing the mankind and natural scientists especially. As we know one of the most brilliant inventions in physics of XIX-th century was combining of electricity and magnetism within the Fa... |
2302.14846 | Eanna E. Flanagan | Eanna E. Flanagan | Khronometric theories of modified Newtonian dynamics | v2: Error in discussion of previous work corrected, discussion of
khronon dynamics expanded, other minor corrections. v3: minor corrections and
clarifications | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2011 Blanchet and Marsat suggested a fully relativistic version of
Milgrom's modified Newtonian dynamics (MOND) in which the dynamical degrees of
freedom consist of the spacetime metric and a foliation of spacetime, the
khronon field. This theory is simpler than the alternative relativsitic
formulations. We show t... | [
{
"created": "Tue, 28 Feb 2023 18:46:35 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Mar 2023 17:45:03 GMT",
"version": "v2"
},
{
"created": "Sun, 24 Sep 2023 13:57:23 GMT",
"version": "v3"
}
] | 2023-09-26 | [
[
"Flanagan",
"Eanna E.",
""
]
] | In 2011 Blanchet and Marsat suggested a fully relativistic version of Milgrom's modified Newtonian dynamics (MOND) in which the dynamical degrees of freedom consist of the spacetime metric and a foliation of spacetime, the khronon field. This theory is simpler than the alternative relativsitic formulations. We show tha... |
2007.03394 | Lance Williams | L.L. Williams | Long-range scalar forces in five-dimensional general relativity | text and mathematics, no figures. Table I did not render well | Adv. Math. Phys., vol. 2020, Article ID 9305187 (2020) | 10.1155/2020/9305187 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Kaluza first observed that the vacuum Einstein equations written in 5
dimensions (5D) reproduce exactly 4D general relativity and classical
electrodynamics, when derivatives of the 5D metric with respect to the 5th
coordinate are set to zero. The 15th component of the 5D metric is a 4D
long-range scalar field, and th... | [
{
"created": "Tue, 7 Jul 2020 12:56:11 GMT",
"version": "v1"
}
] | 2021-02-24 | [
[
"Williams",
"L. L.",
""
]
] | Kaluza first observed that the vacuum Einstein equations written in 5 dimensions (5D) reproduce exactly 4D general relativity and classical electrodynamics, when derivatives of the 5D metric with respect to the 5th coordinate are set to zero. The 15th component of the 5D metric is a 4D long-range scalar field, and the ... |
2311.06630 | Sophie Bini | Sophie Bini, Shubhanshu Tiwari, Yumeng Xu, Leigh Smith, Michael
Ebersold, Giacomo Principe, Maria Haney, Philippe Jetzer, Giovanni A. Prodi | Search for hyperbolic encounters of compact objects in the third
LIGO-Virgo-KAGRA observing run | 11 pages, 9 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational-wave (GW) observations provide unique information about compact
objects. As detectors sensitivity increases, new astrophysical sources of GW
could emerge. Close hyperbolic encounters are one such source class: scattering
of stellar mass compact objects is expected to manifest as GW burst signals in
the ... | [
{
"created": "Sat, 11 Nov 2023 18:26:22 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2024 09:06:16 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Bini",
"Sophie",
""
],
[
"Tiwari",
"Shubhanshu",
""
],
[
"Xu",
"Yumeng",
""
],
[
"Smith",
"Leigh",
""
],
[
"Ebersold",
"Michael",
""
],
[
"Principe",
"Giacomo",
""
],
[
"Haney",
"Maria",
""
],
[
"J... | Gravitational-wave (GW) observations provide unique information about compact objects. As detectors sensitivity increases, new astrophysical sources of GW could emerge. Close hyperbolic encounters are one such source class: scattering of stellar mass compact objects is expected to manifest as GW burst signals in the fr... |
gr-qc/0106032 | Elizabeth Winstanley | Elizabeth Winstanley | On classical super-radiance in Kerr-Newman-anti-de Sitter black holes | 23 pages, 3 figures, v2: minor changes, references added | Phys.Rev. D64 (2001) 104010 | 10.1103/PhysRevD.64.104010 | null | gr-qc | null | We study in detail the modes of a classical scalar field on a
Kerr-Newman-anti-de Sitter (KN-AdS) black hole. We construct sets of basis
modes appropriate to the two possible boundary conditions (``reflective'' and
``transparent'') at time-like infinity, and consider whether super-radiance is
possible. If we employ `... | [
{
"created": "Fri, 8 Jun 2001 14:08:28 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2001 13:40:43 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Winstanley",
"Elizabeth",
""
]
] | We study in detail the modes of a classical scalar field on a Kerr-Newman-anti-de Sitter (KN-AdS) black hole. We construct sets of basis modes appropriate to the two possible boundary conditions (``reflective'' and ``transparent'') at time-like infinity, and consider whether super-radiance is possible. If we employ ``r... |
0908.4518 | Eric Poisson | Simon Comeau and Eric Poisson | Tidal interaction of a small black hole in the field of a large Kerr
black hole | 4 pages, 2 figures | Phys.Rev.D80:087501,2009 | 10.1103/PhysRevD.80.087501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rates at which the mass and angular momentum of a small black hole change
as a result of a tidal interaction with a much larger black hole are calculated
to leading order in the small mass ratio. The small black hole is either
rotating or nonrotating, and it moves on a circular orbit in the equatorial
plane of th... | [
{
"created": "Mon, 31 Aug 2009 12:24:01 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Comeau",
"Simon",
""
],
[
"Poisson",
"Eric",
""
]
] | The rates at which the mass and angular momentum of a small black hole change as a result of a tidal interaction with a much larger black hole are calculated to leading order in the small mass ratio. The small black hole is either rotating or nonrotating, and it moves on a circular orbit in the equatorial plane of the ... |
1801.03157 | Georgios Kraniotis | G. V. Kraniotis | The massive Dirac equation in the Kerr-Newman-de Sitter and Kerr-Newman
black hole spacetimes | LaTeX file, 61 pages, version published in Journal of Physics
Communications(2019 J. Phys. Commun. 3 035026) | J.Phys.Commun.3 (2019) 035026 | 10.1088/2399-6528/ab1046 | null | gr-qc astro-ph.GA hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact solutions of the Dirac general relativistic equation (DE) that describe
the dynamics of a massive, electrically charged particle with half-integer spin
in the curved spacetime geometry of an electrically charged, rotating
Kerr-Newman-(anti) de Sitter black hole (BH) are investigated. We first, derive
the DE in ... | [
{
"created": "Tue, 9 Jan 2018 22:12:40 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2018 18:50:20 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Oct 2018 17:59:08 GMT",
"version": "v3"
},
{
"created": "Mon, 12 Nov 2018 22:50:23 GMT",
"version": "v4"
},
{
"cr... | 2019-05-06 | [
[
"Kraniotis",
"G. V.",
""
]
] | Exact solutions of the Dirac general relativistic equation (DE) that describe the dynamics of a massive, electrically charged particle with half-integer spin in the curved spacetime geometry of an electrically charged, rotating Kerr-Newman-(anti) de Sitter black hole (BH) are investigated. We first, derive the DE in th... |
0806.2834 | Thomas P. Kling | Thomas P. Kling, Bryan Campbell | Poisson equation for weak gravitational lensing | accepted to Phys. Rev. D | Phys.Rev.D77:123012,2008 | 10.1103/PhysRevD.77.123012 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Newman and Penrose spin coefficient (NP) formalism, we examine the
full Bianchi identities of general relativity in the context of gravitational
lensing, where the matter and space-time curvature are projected into a lens
plane perpendicular to the line of sight. From one component of the Bianchi
identity, ... | [
{
"created": "Tue, 17 Jun 2008 16:30:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kling",
"Thomas P.",
""
],
[
"Campbell",
"Bryan",
""
]
] | Using the Newman and Penrose spin coefficient (NP) formalism, we examine the full Bianchi identities of general relativity in the context of gravitational lensing, where the matter and space-time curvature are projected into a lens plane perpendicular to the line of sight. From one component of the Bianchi identity, we... |
gr-qc/9812057 | Adrian P. Gentle | Adrian P. Gentle, Daniel E. Holz, Warner A. Miller and John A. Wheeler | Apparent horizons in simplicial Brill wave initial data | 7 pages, 6 EPS figures, LaTeX 2e. Submitted to Class. Quant. Grav | Class.Quant.Grav. 16 (1999) 1979-1985 | 10.1088/0264-9381/16/6/326 | LAUR-98-5276 | gr-qc | null | We construct initial data for a particular class of Brill wave metrics using
Regge calculus, and compare the results to a corresponding continuum solution,
finding excellent agreement. We then search for trapped surfaces in both sets
of initial data, and provide an independent verification of the existence of an
appa... | [
{
"created": "Wed, 16 Dec 1998 20:46:57 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gentle",
"Adrian P.",
""
],
[
"Holz",
"Daniel E.",
""
],
[
"Miller",
"Warner A.",
""
],
[
"Wheeler",
"John A.",
""
]
] | We construct initial data for a particular class of Brill wave metrics using Regge calculus, and compare the results to a corresponding continuum solution, finding excellent agreement. We then search for trapped surfaces in both sets of initial data, and provide an independent verification of the existence of an appare... |
1503.03826 | Jos\'e Villanueva | V. H. Cardenas, N. Cruz and J. R. Villanueva | Testing a dissipative kinetic k-essence model | 9 pages, 5 figures, accepted in EPJC | Eur. Phys. J. C (2015) 75:148 | 10.1140/epjc/s10052-015-3366-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we present a study of a purely kinetic k-essence model,
characterized basically by a parameter $\alpha$ in presence of a bulk
dissipative term, whose relationship between viscous pressure $\Pi$ and energy
density $\rho$ of the background follows a polytropic type law $\Pi \propto
\rho^{\lambda+1/2}$, wh... | [
{
"created": "Thu, 12 Mar 2015 17:43:24 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Cardenas",
"V. H.",
""
],
[
"Cruz",
"N.",
""
],
[
"Villanueva",
"J. R.",
""
]
] | In this work, we present a study of a purely kinetic k-essence model, characterized basically by a parameter $\alpha$ in presence of a bulk dissipative term, whose relationship between viscous pressure $\Pi$ and energy density $\rho$ of the background follows a polytropic type law $\Pi \propto \rho^{\lambda+1/2}$, wher... |
1110.5776 | Gianluca Delfino | Gianluca Delfino | Deriving identities for Wigner {nj}-symbols | 22 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how a simple and elegant graphical notation can be used to derive the
Biedenharn-Elliot identity for the 6j-symbol and we demonstrate how the same
technique can be applied to obtain new identities for the 6j. We then employ
the same method also in the context of 4D spin-foam gravity and propose an
analogous i... | [
{
"created": "Wed, 26 Oct 2011 12:31:18 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2011 11:20:56 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Nov 2012 14:38:31 GMT",
"version": "v3"
}
] | 2012-12-03 | [
[
"Delfino",
"Gianluca",
""
]
] | We show how a simple and elegant graphical notation can be used to derive the Biedenharn-Elliot identity for the 6j-symbol and we demonstrate how the same technique can be applied to obtain new identities for the 6j. We then employ the same method also in the context of 4D spin-foam gravity and propose an analogous ide... |
2401.13005 | Jinwen Hu | Jinwen Hu, Huan Hu | Viscous universe with cosmological constant | 17 pages, 6 figures, 3 tables | The European Physical Journal Plus (2020) 135 | 10.1140/epjp/s13360-020-00623-1 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We investigated a bulk viscous fluid universe with cosmological constant
{\Lambda} by assuming that the bulk viscosity to be proportional to the Hubble
parameter. We found that for an expanding universe, the (relative) matter
density will be always greater than a non-zero constant, and tends to this
non-zero constant... | [
{
"created": "Tue, 23 Jan 2024 05:08:21 GMT",
"version": "v1"
}
] | 2024-01-25 | [
[
"Hu",
"Jinwen",
""
],
[
"Hu",
"Huan",
""
]
] | We investigated a bulk viscous fluid universe with cosmological constant {\Lambda} by assuming that the bulk viscosity to be proportional to the Hubble parameter. We found that for an expanding universe, the (relative) matter density will be always greater than a non-zero constant, and tends to this non-zero constant i... |
gr-qc/0207073 | Jeongwon Ho | Jeongwon Ho, F.C. Khanna, and Chul H. Lee | Boson Stars with Self-Interacting Quantum Scalar Fields | 18 pages, Revtex | null | null | null | gr-qc astro-ph hep-th | null | The Klein-Gordon-Einstein equations of classical real scalar fields have
time-dependent solutions (periodic in time). We show that quantum real scalar
fields can form non-oscillating (static) solitonic objects, which are quite
similar to the solutions describing boson stars formed with classical and
quantum complex s... | [
{
"created": "Thu, 18 Jul 2002 20:04:44 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 2003 23:46:25 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ho",
"Jeongwon",
""
],
[
"Khanna",
"F. C.",
""
],
[
"Lee",
"Chul H.",
""
]
] | The Klein-Gordon-Einstein equations of classical real scalar fields have time-dependent solutions (periodic in time). We show that quantum real scalar fields can form non-oscillating (static) solitonic objects, which are quite similar to the solutions describing boson stars formed with classical and quantum complex sca... |
2011.00273 | Benrong Mu | Benrong Mu, Jing Liang and Xiaobo Guo | Thermodynamics with pressure and volume of 4D Gauss-Bonnet AdS Black
Holes under the scalar field | 17 pages, 6 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the scattering of a scalar field, we discuss the thermodynamics and
overcharging problem in a 4D Gauss-Bonnet AdS black hole in both the normal
phase space and extended phase space. In the normal phase space, where the
cosmological constant and Gauss-Bonnet parameter are fixed, the first law and
the second l... | [
{
"created": "Sat, 31 Oct 2020 13:43:53 GMT",
"version": "v1"
}
] | 2020-11-03 | [
[
"Mu",
"Benrong",
""
],
[
"Liang",
"Jing",
""
],
[
"Guo",
"Xiaobo",
""
]
] | By using the scattering of a scalar field, we discuss the thermodynamics and overcharging problem in a 4D Gauss-Bonnet AdS black hole in both the normal phase space and extended phase space. In the normal phase space, where the cosmological constant and Gauss-Bonnet parameter are fixed, the first law and the second law... |
2306.02324 | Di Wu | Di Wu | Consistent thermodynamics and topological classes for the
four-dimensional Lorentzian charged Taub-NUT spacetimes | 11 pages, 6 figures, 1 table, revtex-4-1.cls, to appear in EPJC | Eur. Phys. J. C 83 (2023) 589 | 10.1140/epjc/s10052-023-11782-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we derive the consistent thermodynamics of the
four-dimensional Lorentzian charged Reissner-Nordstr\"om-NUT (RN-NUT),
Kerr-Newman-NUT (KN-NUT), and RN-NUT-AdS spacetimes in the framework of the
($\psi-\mathcal{N}$)-pair formalism, and then investigate their topological
numbers by using the uniformly mo... | [
{
"created": "Sun, 4 Jun 2023 10:45:56 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2023 17:21:01 GMT",
"version": "v2"
}
] | 2023-07-12 | [
[
"Wu",
"Di",
""
]
] | In this paper, we derive the consistent thermodynamics of the four-dimensional Lorentzian charged Reissner-Nordstr\"om-NUT (RN-NUT), Kerr-Newman-NUT (KN-NUT), and RN-NUT-AdS spacetimes in the framework of the ($\psi-\mathcal{N}$)-pair formalism, and then investigate their topological numbers by using the uniformly modi... |
2403.02533 | Gustav Holzegel | Gustav Holzegel, Georgios Mavrogiannis, Renato Velozo Ruiz | A note on integrated local energy decay estimates for spherically
symmetric black hole spacetimes | null | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present short proofs of integrated local energy decay estimates on
Schwarzschild, extremal Reissner-Nordstr\"om, and Schwarzschild-de Sitter
spacetimes. The proofs employ novel global physical space multipliers, which,
besides their remarkable simplicity, (a) are directly derivable from the
geodesic flow, (b) do n... | [
{
"created": "Mon, 4 Mar 2024 22:59:19 GMT",
"version": "v1"
}
] | 2024-03-06 | [
[
"Holzegel",
"Gustav",
""
],
[
"Mavrogiannis",
"Georgios",
""
],
[
"Ruiz",
"Renato Velozo",
""
]
] | We present short proofs of integrated local energy decay estimates on Schwarzschild, extremal Reissner-Nordstr\"om, and Schwarzschild-de Sitter spacetimes. The proofs employ novel global physical space multipliers, which, besides their remarkable simplicity, (a) are directly derivable from the geodesic flow, (b) do not... |
gr-qc/0702024 | Orchidea Maria Lecian | Orchidea Maria Lecian, Simone Mercuri, Giovanni Montani | Is Torsion a Fundamental Physical Field? | 3 pages, proceedings of the XI Marcel Grossmann meeting on
Relativistic Astrophysics, July 23-29, 2006, Berlin | null | 10.1142/9789812834300_0490 | null | gr-qc | null | The local Lorentz group is introduced in flat space-time, where the resulting
Dirac and Yang-Mills equations are found, and then generalized to curved
space-time: if matter is neglected, the Lorentz connection is identified with
the contortion field, while, if matter is taken into account, both the Lorentz
connection... | [
{
"created": "Mon, 5 Feb 2007 17:16:44 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Lecian",
"Orchidea Maria",
""
],
[
"Mercuri",
"Simone",
""
],
[
"Montani",
"Giovanni",
""
]
] | The local Lorentz group is introduced in flat space-time, where the resulting Dirac and Yang-Mills equations are found, and then generalized to curved space-time: if matter is neglected, the Lorentz connection is identified with the contortion field, while, if matter is taken into account, both the Lorentz connection a... |
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