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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0002035 | Leonid Grishchuk | L P Grishchuk | Relic Gravitational Waves and Their Detection | 25 pages, 9 figures included, revtex. Based on a talk given at
"Gyros, Clocks, and Interferometers: Testing General Relativity in Space"
(Germany, August 99) | Lect.Notes Phys. 562 (2001) 167-194 | 10.1007/3-540-40988-2_9 | null | gr-qc astro-ph hep-ph | null | The range of expected amplitudes and spectral slopes of relic (squeezed)
gravitational waves, predicted by theory and partially supported by
observations, is within the reach of sensitive gravity-wave detectors. In the
most favorable case, the detection of relic gravitational waves can be achieved
by the cross-correl... | [
{
"created": "Tue, 8 Feb 2000 19:40:04 GMT",
"version": "v1"
}
] | 2016-12-07 | [
[
"Grishchuk",
"L P",
""
]
] | The range of expected amplitudes and spectral slopes of relic (squeezed) gravitational waves, predicted by theory and partially supported by observations, is within the reach of sensitive gravity-wave detectors. In the most favorable case, the detection of relic gravitational waves can be achieved by the cross-correlat... |
1706.00604 | Alexander B. Balakin | Timur Yu. Alpin and Alexander B. Balakin | Birefringence induced by pp-wave modes in an electromagnetically active
dynamic aether | 13 pages, 0 figures, list of references is modified, misprints
eliminated | The European Physical Journal C: 77, 699 (2017) | 10.1140/epjc/s10052-017-5299-2 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the Einstein-Maxwell-aether theory we study the
birefringence effect, which can occur in the pp-wave symmetric dynamic aether.
The dynamic aether is considered to be latently birefringent quasi-medium,
which displays this hidden property if and only if the aether motion is
non-uniform, i.e., when ... | [
{
"created": "Fri, 2 Jun 2017 09:25:36 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2017 08:40:13 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Alpin",
"Timur Yu.",
""
],
[
"Balakin",
"Alexander B.",
""
]
] | In the framework of the Einstein-Maxwell-aether theory we study the birefringence effect, which can occur in the pp-wave symmetric dynamic aether. The dynamic aether is considered to be latently birefringent quasi-medium, which displays this hidden property if and only if the aether motion is non-uniform, i.e., when th... |
0704.3648 | Muhammad Sharif | M. Sharif | Perturbed Self-Similar Massless Scalar Field in Spherically Symmetric
Spaceimes | 15 pages, accepted for publication Int. J. Mod. Phys. A | Int.J.Mod.Phys.A22:4695-4708,2007 | 10.1142/S0217751X07037214 | null | gr-qc | null | In this paper, we investigate the linear perturbations of the spherically
symmetric spacetimes with kinematic self-similarity of the second kind. The
massless scalar field equations are solved which yield the background and an
exact solutions for the perturbed equations. We discuss the boundary conditions
of the resu... | [
{
"created": "Fri, 27 Apr 2007 02:11:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sharif",
"M.",
""
]
] | In this paper, we investigate the linear perturbations of the spherically symmetric spacetimes with kinematic self-similarity of the second kind. The massless scalar field equations are solved which yield the background and an exact solutions for the perturbed equations. We discuss the boundary conditions of the result... |
gr-qc/9912079 | Dieter Brill | Dieter Brill | 2+1-dimensional black holes with momentum and angular momentum | 11 pages, 4 LaTeX figures. Plenary talk presented at the "Journees
Relativistes" in Weimar, September 1999. Submitted to Ann. Phys. (Leipzig) | Annalen Phys.9:217-226,2000 | 10.1002/(SICI)1521-3889(200005)9:3/5<217::AID-ANDP217>3.0.CO;2-H | null | gr-qc | null | Exact solutions of Einstein's equations in 2+1-dimensional anti-de Sitter
space containing any number of black holes are described. In addition to the
black holes these spacetimes can possess ``internal'' structure. Accordingly
the generic spacetime of this type depends on a large number of parameters.
Half of these ... | [
{
"created": "Sat, 18 Dec 1999 19:33:55 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Brill",
"Dieter",
""
]
] | Exact solutions of Einstein's equations in 2+1-dimensional anti-de Sitter space containing any number of black holes are described. In addition to the black holes these spacetimes can possess ``internal'' structure. Accordingly the generic spacetime of this type depends on a large number of parameters. Half of these ca... |
gr-qc/9906011 | Ms. Amita Shaw | S.Biswas, A.Shaw, B.Modak and D.Biswas | Quantum Gravity Equation In Schroedinger Form In Minisuperspace
Description | 11 Pages, ReVTeX, no figure | Gen.Rel.Grav. 32 (2000) 2167-2187 | 10.1023/A:1001902620253 | null | gr-qc | null | We start from classical Hamiltonian constraint of general relativity to
obtain the Einstein-Hamiltonian-Jacobi equation. We obtain a time parameter
prescription demanding that geometry itself determines the time, not the matter
field, such that the time so defined being equivalent to the time that enters
into the Sch... | [
{
"created": "Thu, 3 Jun 1999 09:01:54 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Biswas",
"S.",
""
],
[
"Shaw",
"A.",
""
],
[
"Modak",
"B.",
""
],
[
"Biswas",
"D.",
""
]
] | We start from classical Hamiltonian constraint of general relativity to obtain the Einstein-Hamiltonian-Jacobi equation. We obtain a time parameter prescription demanding that geometry itself determines the time, not the matter field, such that the time so defined being equivalent to the time that enters into the Schro... |
1301.7041 | Yasha Neiman | Yasha Neiman | The imaginary part of the gravity action and black hole entropy | 37 pages, 8 figures; v2: sign error corrected; v3: refined the
treatment of Lovelock gravity, added section 3 with expanded discussion,
added references | JHEP 1304 (2013) 071 | 10.1007/JHEP04(2013)071 | IGC-13/1-1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As observed recently in arXiv:1212.2922, the action of General Relativity
(GR) in finite spacetime regions has an imaginary part that resembles the
Bekenstein entropy. In this paper, we expand on that argument, with attention
to different causal types of boundaries. This property of the GR action may
open a new appro... | [
{
"created": "Tue, 29 Jan 2013 20:03:06 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Feb 2013 18:40:04 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Apr 2013 20:59:07 GMT",
"version": "v3"
}
] | 2013-12-12 | [
[
"Neiman",
"Yasha",
""
]
] | As observed recently in arXiv:1212.2922, the action of General Relativity (GR) in finite spacetime regions has an imaginary part that resembles the Bekenstein entropy. In this paper, we expand on that argument, with attention to different causal types of boundaries. This property of the GR action may open a new approac... |
1904.05287 | Steven B. Giddings | Steven B. Giddings | Searching for quantum black hole structure with the Event Horizon
Telescope | 6 pages + refs. v2: a few typos corrected. v3: CERN report number
added. v4: Minor clarification re. apparent EHT image variation | Universe 2019, 5, 201 | 10.3390/universe5090201 | CERN-TH-2019-076 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The impressive images from the Event Horizon Telescope sharpen the conflict
between our observations of gravitational phenomena and the principles of
quantum mechanics. Two related scenarios for reconciling quantum mechanics with
the existence of black hole-like objects, with "minimal" departure from general
relativi... | [
{
"created": "Wed, 10 Apr 2019 16:42:18 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Apr 2019 08:38:20 GMT",
"version": "v2"
},
{
"created": "Wed, 29 May 2019 08:23:54 GMT",
"version": "v3"
},
{
"created": "Tue, 17 Sep 2019 15:40:39 GMT",
"version": "v4"
}
] | 2019-09-18 | [
[
"Giddings",
"Steven B.",
""
]
] | The impressive images from the Event Horizon Telescope sharpen the conflict between our observations of gravitational phenomena and the principles of quantum mechanics. Two related scenarios for reconciling quantum mechanics with the existence of black hole-like objects, with "minimal" departure from general relativity... |
1512.04072 | B. V. Ivanov | B. V. Ivanov | A different approach to anisotropic spherical collapse with shear and
heat radiation | 15 pages, to appear in Int.J.Mod.Phys.D | Int. J. Mod. Phys. D 25, No.4 (2016) 1650049 | 10.1142/S0218271816500498 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to study the type of collapse, mentioned in the title, we introduce
a physically meaningful object, called the horizon function. It directly enters
the expressions for many of the stellar characteristics. The main junction
equation, which governs the collapse, transforms into a Riccati equation with
simple c... | [
{
"created": "Sun, 13 Dec 2015 15:58:30 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jan 2016 17:26:49 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Ivanov",
"B. V.",
""
]
] | In order to study the type of collapse, mentioned in the title, we introduce a physically meaningful object, called the horizon function. It directly enters the expressions for many of the stellar characteristics. The main junction equation, which governs the collapse, transforms into a Riccati equation with simple coe... |
1105.6192 | T. Roy Choudhury | T. Roy Choudhury and T. Padmanabhan | Reply to [arXiv:1105.5653]: "Comment on 'Quasinormal modes in
Schwarzschild-de Sitter spacetime: A simple derivation of the level spacing
of the frequencies'" | 2 pages | Phys.Rev.D83:108502,2011 | 10.1103/PhysRevD.83.108502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explain why the analysis in our paper [Phys. Rev. D 69, 064033 (2004),
arXiv:gr-qc/0311064 ] is relevant and correct.
| [
{
"created": "Tue, 31 May 2011 07:50:31 GMT",
"version": "v1"
}
] | 2011-06-07 | [
[
"Choudhury",
"T. Roy",
""
],
[
"Padmanabhan",
"T.",
""
]
] | We explain why the analysis in our paper [Phys. Rev. D 69, 064033 (2004), arXiv:gr-qc/0311064 ] is relevant and correct. |
1708.09371 | Benito A. Ju\'arez-Aubry | Benito A. Ju\'arez-Aubry, Bernard S. Kay and Daniel Sudarsky | Generally covariant dynamical reduction models and the Hadamard
condition | V2: 20 pages. Some typos corrected and new remarks in the
Introduction. For an extended version of this paper see V1 | Phys. Rev. D 97, 025010 (2018) | 10.1103/PhysRevD.97.025010 | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide general guidelines for generalizing dynamical reduction models to
curved spacetimes and propose a class of generally covariant relativistic
versions of the GRW model. We anticipate that the collapse operators of our
class of models may play a r\^ole in a yet-to-be-formulated theory of
semiclassical gravity... | [
{
"created": "Wed, 30 Aug 2017 17:23:01 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2018 20:22:39 GMT",
"version": "v2"
}
] | 2018-02-06 | [
[
"Juárez-Aubry",
"Benito A.",
""
],
[
"Kay",
"Bernard S.",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | We provide general guidelines for generalizing dynamical reduction models to curved spacetimes and propose a class of generally covariant relativistic versions of the GRW model. We anticipate that the collapse operators of our class of models may play a r\^ole in a yet-to-be-formulated theory of semiclassical gravity w... |
0904.3949 | Julio Cesar Fabris | C.E.M. Batista, J.C. Fabris and M. Morita | Power spectrum in the Chaplygin gas model: tachyonic, fluid and scalar
field representations | Latex file, 10 pages, 18 figures in EPS format | null | 10.1007/s10714-009-0884-9 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Chaplygin gas model, characterized by an equation of state of the type $p
= - \frac{A}{\rho}$ emerges naturally from the Nambu-Goto action of string
theory. This fluid representation can be recast under the form of a tachyonic
field given by a Born-Infeld type Lagrangian. At the same time, the Chaplygin
gas equat... | [
{
"created": "Fri, 24 Apr 2009 22:00:34 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Batista",
"C. E. M.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Morita",
"M.",
""
]
] | The Chaplygin gas model, characterized by an equation of state of the type $p = - \frac{A}{\rho}$ emerges naturally from the Nambu-Goto action of string theory. This fluid representation can be recast under the form of a tachyonic field given by a Born-Infeld type Lagrangian. At the same time, the Chaplygin gas equatio... |
gr-qc/9712092 | Schubert | Uwe Mueller (Mainz Univ.), Christian Schubert (Argonne), Anton van de
Ven (Hamburg Univ.) | A Closed Formula for the Riemann Normal Coordinate Expansion | 8 pages, standard latex, no figures, minor modifications | Gen.Rel.Grav.31:1759-1768,1999 | 10.1023/A:1026718301634 | DESY 97-254, ANL-HEP-PR-97-99, MZ-TH/97-38 | gr-qc dg-ga hep-th math.DG | null | We derive an integral representation which encodes all coefficients of the
Riemann normal coordinate expansion, and also a closed formula for those
coefficients.
| [
{
"created": "Wed, 24 Dec 1997 00:52:20 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 1999 20:53:34 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Mueller",
"Uwe",
"",
"Mainz Univ."
],
[
"Schubert",
"Christian",
"",
"Argonne"
],
[
"van de Ven",
"Anton",
"",
"Hamburg Univ."
]
] | We derive an integral representation which encodes all coefficients of the Riemann normal coordinate expansion, and also a closed formula for those coefficients. |
1001.3511 | Kirill Bronnikov | Kirill A. Bronnikov, Sergey V. Sushkov | Trapped ghosts: a new class of wormholes | 4.2 pages, 4 figures. Version to appear in CQG | Class. Quantum Grav. 27, 095022 (2010) | 10.1088/0264-9381/27/9/095022 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct examples of static, spherically symmetric wormhole solutions in
general relativity with a minimally coupled scalar field $\phi$ whose kinetic
energy is negative in a restricted region of space near the throat (of
arbitrary size) and positive far from it. Thus in such configurations a "ghost"
is trapped i... | [
{
"created": "Wed, 20 Jan 2010 11:24:10 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2010 16:06:21 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Sushkov",
"Sergey V.",
""
]
] | We construct examples of static, spherically symmetric wormhole solutions in general relativity with a minimally coupled scalar field $\phi$ whose kinetic energy is negative in a restricted region of space near the throat (of arbitrary size) and positive far from it. Thus in such configurations a "ghost" is trapped in ... |
1904.10794 | Andrej Arbuzov | Andrej B. Arbuzov, Alexander E. Pavlov | Intrinsic Time in Geometrodynamics of Closed Manifolds | 11 pages; format is changed; arXiv admin note: substantial text
overlap with arXiv:1710.01528 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The global time in Geometrodynamics is defined in a covariant under
diffeomorphisms form. An arbitrary static background metric is taken in the
tangent space. The global intrinsic time is identified with the mean value of
the logarithm of the square root of the ratio of the metric determinants. The
procedures of the ... | [
{
"created": "Tue, 23 Apr 2019 07:56:32 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 14:10:42 GMT",
"version": "v2"
}
] | 2019-05-17 | [
[
"Arbuzov",
"Andrej B.",
""
],
[
"Pavlov",
"Alexander E.",
""
]
] | The global time in Geometrodynamics is defined in a covariant under diffeomorphisms form. An arbitrary static background metric is taken in the tangent space. The global intrinsic time is identified with the mean value of the logarithm of the square root of the ratio of the metric determinants. The procedures of the Ha... |
2401.15003 | Ao Guo | Ao Guo, Jun Zhang, Huan Yang | Superradiant clouds may be relevant for close compact object binaries | null | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bosonic fields (within suitable mass range) may be collectively generated by
rotating black holes through the black hole superradiance process. The
resulting black hole is surrounded by a ``cloud" of particles whose wave
function populates the superradiant energy level of the black hole. For
comparable mass ratio bin... | [
{
"created": "Fri, 26 Jan 2024 17:04:59 GMT",
"version": "v1"
},
{
"created": "Thu, 9 May 2024 08:56:11 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Jul 2024 04:32:02 GMT",
"version": "v3"
}
] | 2024-07-29 | [
[
"Guo",
"Ao",
""
],
[
"Zhang",
"Jun",
""
],
[
"Yang",
"Huan",
""
]
] | Bosonic fields (within suitable mass range) may be collectively generated by rotating black holes through the black hole superradiance process. The resulting black hole is surrounded by a ``cloud" of particles whose wave function populates the superradiant energy level of the black hole. For comparable mass ratio binar... |
1705.02382 | James Edholm | Aindri\'u Conroy, James Edholm | Newtonian Potential and Geodesic Completeness in Infinite Derivative
Gravity | 7 pages, 3 figures | Phys. Rev. D 96, 044012 (2017) | 10.1103/PhysRevD.96.044012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent study has shown that a non-singular oscillating potential, a feature
of Infinite Derivative Gravity (IDG) theories, matches current experimental
data better than the standard GR potential. In this work we show that this
non-singular oscillating potential can be given by a wider class of theories
which allows t... | [
{
"created": "Fri, 5 May 2017 20:01:21 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2017 21:47:30 GMT",
"version": "v2"
}
] | 2017-08-16 | [
[
"Conroy",
"Aindriú",
""
],
[
"Edholm",
"James",
""
]
] | Recent study has shown that a non-singular oscillating potential, a feature of Infinite Derivative Gravity (IDG) theories, matches current experimental data better than the standard GR potential. In this work we show that this non-singular oscillating potential can be given by a wider class of theories which allows the... |
0912.5286 | Salvatore Capozziello | Salvatore Capozziello, Mariafelicia De Laurentis, Arturo Stabile | Axially symmetric solutions in f(R)-gravity | 13 pages, 1 figure, to appear in Classical and Quantum Gravity 2010 | Class.Quant.Grav.27:165008,2010 | 10.1088/0264-9381/27/16/165008 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axially symmetric solutions for f (R)-gravity can be derived starting from
exact spherically sym- metric solutions achieved by Noether symmetries. The
method takes advantage of a complex coordi- nate transformation previously
developed by Newman and Janis in General Relativity. An example is worked out
to show the ge... | [
{
"created": "Tue, 29 Dec 2009 10:14:17 GMT",
"version": "v1"
},
{
"created": "Sat, 29 May 2010 16:06:02 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Stabile",
"Arturo",
""
]
] | Axially symmetric solutions for f (R)-gravity can be derived starting from exact spherically sym- metric solutions achieved by Noether symmetries. The method takes advantage of a complex coordi- nate transformation previously developed by Newman and Janis in General Relativity. An example is worked out to show the gene... |
2307.06474 | Daniela Doneva | Daniela D. Doneva, Llibert Arest\'e Sal\'o, Katy Clough, Pau Figueras,
Stoytcho S. Yazadjiev | Testing the limits of scalar-Gauss-Bonnet gravity through nonlinear
evolutions of spin-induced scalarization | 23 pages, 10 figure, 1 table | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quadratic theories of gravity with second order equations of motion provide
an interesting model for testing deviations from general relativity in the
strong gravity regime. However, they can suffer from a loss of hyperbolicity,
even for initial data that is in the weak coupling regime and free from any
obvious patho... | [
{
"created": "Wed, 12 Jul 2023 22:10:32 GMT",
"version": "v1"
}
] | 2023-07-14 | [
[
"Doneva",
"Daniela D.",
""
],
[
"Saló",
"Llibert Aresté",
""
],
[
"Clough",
"Katy",
""
],
[
"Figueras",
"Pau",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | Quadratic theories of gravity with second order equations of motion provide an interesting model for testing deviations from general relativity in the strong gravity regime. However, they can suffer from a loss of hyperbolicity, even for initial data that is in the weak coupling regime and free from any obvious patholo... |
2203.06588 | Pritam Nanda | Pritam Nanda, Chiranjeeb Singha, Pabitra Tripathy, Amit Ghosh | Hawking radiation as quantum mechanical reflection | 9 pages and 3 figures, accepted for publication in General Relativity
and Gravitation | null | 10.1007/s10714-022-03007-1 | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | In this article, we explore an alternative derivation of Hawking radiation.
Instead of the field-theoretic derivation, we have suggested a simpler
calculation based on quantum mechanical reflection from a one-dimensional
potential. The reflection coefficient shows an exponential fall in energy
which, in comparison wi... | [
{
"created": "Sun, 13 Mar 2022 06:40:08 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Sep 2022 17:43:13 GMT",
"version": "v2"
}
] | 2022-10-14 | [
[
"Nanda",
"Pritam",
""
],
[
"Singha",
"Chiranjeeb",
""
],
[
"Tripathy",
"Pabitra",
""
],
[
"Ghosh",
"Amit",
""
]
] | In this article, we explore an alternative derivation of Hawking radiation. Instead of the field-theoretic derivation, we have suggested a simpler calculation based on quantum mechanical reflection from a one-dimensional potential. The reflection coefficient shows an exponential fall in energy which, in comparison with... |
2008.05597 | Li Li | Li Li | On Thermodynamics of AdS Black Holes with Scalar Hair | 15 pages, 2 figures; v2: minor changes, reference added; v3: revised
version, to appear in PLB; v4: typos corrected in the left plots of Figures.
1 and 2 | null | 10.1016/j.physletb.2021.136123 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been known that in the presence of a scalar hair there would be a
distinct additional contribution to the first law of black hole thermodynamics.
While it has been checked in many examples, a deeper understanding of this
issue is necessary. The thermodynamics of AdS black holes in Einstein-scalar
gravity is st... | [
{
"created": "Wed, 12 Aug 2020 23:05:52 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2020 03:26:09 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Feb 2021 01:22:58 GMT",
"version": "v3"
},
{
"created": "Thu, 27 Jan 2022 02:48:11 GMT",
"version": "v4"
}
] | 2022-01-28 | [
[
"Li",
"Li",
""
]
] | It has been known that in the presence of a scalar hair there would be a distinct additional contribution to the first law of black hole thermodynamics. While it has been checked in many examples, a deeper understanding of this issue is necessary. The thermodynamics of AdS black holes in Einstein-scalar gravity is stud... |
1904.04368 | Thomas Zannias | Jose Felix Salazar and Thomas Zannias | On Extended Thermodynamics: From Classical to the Relativistic Regime | An extended version of arXiv:1904.04368v2 [gr-qc]. New version
contains 90 pages,no figures,new sections and two new Appendixes added to the
previous version. In this electronic version new proofs and new references
added and various misprints are corrected from the published version | International Journal of Modern Physics D Vol. 29, No. 15, 2030010
(2020) | 10.1142/S0218271820300104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent monumental detection of gravitational waves by LIGO, the
subsequent detection by the LIGO/VIRGO observatories of a binary neutron star
merger seen in the gravitational wave signal $GW170817$,the first photo of the
event horizon of the supermassive black hole at the center of the $M87$ galaxy
released by th... | [
{
"created": "Mon, 8 Apr 2019 21:31:46 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2019 18:02:10 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Oct 2021 17:58:29 GMT",
"version": "v3"
}
] | 2021-10-11 | [
[
"Salazar",
"Jose Felix",
""
],
[
"Zannias",
"Thomas",
""
]
] | The recent monumental detection of gravitational waves by LIGO, the subsequent detection by the LIGO/VIRGO observatories of a binary neutron star merger seen in the gravitational wave signal $GW170817$,the first photo of the event horizon of the supermassive black hole at the center of the $M87$ galaxy released by the ... |
1508.06727 | Ramon Herrera | Ramon Herrera and Roberto G. Perez | Approach to exact solutions of cosmological perturbations: Tachyon field
inflation | 19 pages and 4 figures | Phys. Rev. D 93, 063516 (2016) | 10.1103/PhysRevD.93.063516 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An inflationary universe scenario in the context of tachyon field is studied.
This study is done from an ansantz for the effective potential of cosmological
perturbations $U(\eta)$. We describe in great detail the analytical solutions
of the scalar and tensor perturbations for two different ansantz in the
effective p... | [
{
"created": "Thu, 27 Aug 2015 05:55:47 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Herrera",
"Ramon",
""
],
[
"Perez",
"Roberto G.",
""
]
] | An inflationary universe scenario in the context of tachyon field is studied. This study is done from an ansantz for the effective potential of cosmological perturbations $U(\eta)$. We describe in great detail the analytical solutions of the scalar and tensor perturbations for two different ansantz in the effective pot... |
1010.3416 | Volker Perlick | Volker Perlick | Gravitational Lensing from a Spacetime Perspective | 120 pages, 31 figures; submitted to Living Reviews in Relativity;
updated version of http://www.livingreviews.org/lrr-2004-9 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theory of gravitational lensing is reviewed from a spacetime perspective,
without quasi-Newtonian approximations. More precisely, the review covers all
aspects of gravitational lensing where light propagation is described in terms
of lightlike geodesics of a metric of Lorentzian signature. It includes the
basic e... | [
{
"created": "Sun, 17 Oct 2010 14:38:29 GMT",
"version": "v1"
}
] | 2010-10-19 | [
[
"Perlick",
"Volker",
""
]
] | The theory of gravitational lensing is reviewed from a spacetime perspective, without quasi-Newtonian approximations. More precisely, the review covers all aspects of gravitational lensing where light propagation is described in terms of lightlike geodesics of a metric of Lorentzian signature. It includes the basic equ... |
gr-qc/9509055 | Joseph David Romano | Joseph D. Romano and Charles G. Torre | Internal Time Formalism for Spacetimes with Two Killing Vectors | 36 pages, TeX | Phys.Rev. D53 (1996) 5634-5650 | 10.1103/PhysRevD.53.5634 | null | gr-qc | null | The Hamiltonian structure of spacetimes with two commuting Killing vector
fields is analyzed for the purpose of addressing the various problems of time
that arise in canonical gravity. Two specific models are considered: (i)
cylindrically symmetric spacetimes, and (ii) toroidally symmetric spacetimes,
which respectiv... | [
{
"created": "Thu, 28 Sep 1995 19:23:42 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Romano",
"Joseph D.",
""
],
[
"Torre",
"Charles G.",
""
]
] | The Hamiltonian structure of spacetimes with two commuting Killing vector fields is analyzed for the purpose of addressing the various problems of time that arise in canonical gravity. Two specific models are considered: (i) cylindrically symmetric spacetimes, and (ii) toroidally symmetric spacetimes, which respectivel... |
1810.03204 | Luca Guido Molinari | Salvatore Capozziello, Carlo Alberto Mantica and Luca Guido Molinari | Cosmological perfect-fluids in f(R) gravity | 13 pages, final version | Int. J. Geom. Meth. Mod. Phys. 16 (2019) 1950008 | 10.1142/S0219887819500087 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that an n-dimensional generalized Robertson-Walker (GRW) space-time
with divergence-free conformal curvature tensor exhibits a perfect fluid
stress-energy tensor for any f(R) gravity model. Furthermore we prove that a
conformally flat GRW space-time is still a perfect fluid in both f(R) and
quadratic gravity ... | [
{
"created": "Sun, 7 Oct 2018 20:34:06 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Nov 2018 13:14:59 GMT",
"version": "v2"
}
] | 2018-11-08 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Mantica",
"Carlo Alberto",
""
],
[
"Molinari",
"Luca Guido",
""
]
] | We show that an n-dimensional generalized Robertson-Walker (GRW) space-time with divergence-free conformal curvature tensor exhibits a perfect fluid stress-energy tensor for any f(R) gravity model. Furthermore we prove that a conformally flat GRW space-time is still a perfect fluid in both f(R) and quadratic gravity wh... |
gr-qc/9610044 | Renaud Parentani | R. Parentani | Time dependent Green functions from Wheeler De Witt solutions | 25 pages, latex, no figures | Nucl.Phys. B492 (1997) 475-500 | 10.1016/S0550-3213(97)80042-9 | LPTENS 96/45 | gr-qc | null | The aim of this article is twofold. First we examine from a new angle the
question of recovery of time in quantum cosmology. We construct Green functions
for matter fields from the solutions of the Wheeler De Witt equation. For
simplicity we work in a mini-superspace context. By evaluating these Green
functions in a ... | [
{
"created": "Mon, 21 Oct 1996 09:35:40 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Parentani",
"R.",
""
]
] | The aim of this article is twofold. First we examine from a new angle the question of recovery of time in quantum cosmology. We construct Green functions for matter fields from the solutions of the Wheeler De Witt equation. For simplicity we work in a mini-superspace context. By evaluating these Green functions in a fi... |
gr-qc/0202012 | John W. Moffat | J. W. Moffat | Bimetric Gravity Theory, Varying Speed of Light and the Dimming of
Supernovae | 22 pages, Latex file. No figures. Corrected typos. Added reference.
Further references added. Further corrections. To be published in Int. J.
Mod. Phys. D, 2002 | Int.J.Mod.Phys.D12:281-298,2003 | 10.1142/S0218271803002366 | null | gr-qc astro-ph hep-ph hep-th | null | In the bimetric scalar-tensor gravitational theory there are two frames
associated with the two metrics {\hat g}_{\mu\nu} and g_{\mu\nu}, which are
linked by the gradients of a scalar field \phi. The choice of a comoving frame
for the metric {\hat g}_{\mu\nu} or g_{\mu\nu} has fundamental consequences for
local obser... | [
{
"created": "Tue, 5 Feb 2002 19:40:15 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Feb 2002 22:09:14 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2002 17:26:02 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Mar 2002 23:21:55 GMT",
"version": "v4"
},
{
"cr... | 2014-11-17 | [
[
"Moffat",
"J. W.",
""
]
] | In the bimetric scalar-tensor gravitational theory there are two frames associated with the two metrics {\hat g}_{\mu\nu} and g_{\mu\nu}, which are linked by the gradients of a scalar field \phi. The choice of a comoving frame for the metric {\hat g}_{\mu\nu} or g_{\mu\nu} has fundamental consequences for local observe... |
1709.02787 | Nikolaos Stergioulas | Gabriele Bozzola, Nikolaos Stergioulas, Andreas Bauswein | Universal relations for differentially rotating relativistic stars at
the threshold to collapse | 8 pages, 8 figures, submitted to MNRAS | null | 10.1093/mnras/stx3002 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A binary neutron star merger produces a rapidly and differentially rotating
compact remnant whose lifespan heavily affects the electromagnetic and
gravitational emissions. Its stability depends on both the equation of state
(EOS) and the rotation law and it is usually investigated through numerical
simulations. Never... | [
{
"created": "Fri, 8 Sep 2017 17:40:40 GMT",
"version": "v1"
}
] | 2017-12-27 | [
[
"Bozzola",
"Gabriele",
""
],
[
"Stergioulas",
"Nikolaos",
""
],
[
"Bauswein",
"Andreas",
""
]
] | A binary neutron star merger produces a rapidly and differentially rotating compact remnant whose lifespan heavily affects the electromagnetic and gravitational emissions. Its stability depends on both the equation of state (EOS) and the rotation law and it is usually investigated through numerical simulations. Neverth... |
gr-qc/0411021 | Marco Bruni | Andrea Passamonti, Marco Bruni, Leonardo Gualtieri, Carlos F. Sopuerta | Coupling of radial and non-radial oscillations of Neutron stars | 4 pages. Proceedings of the NATO Advanced Study Institute on the
Electromagnetic Spectrum of Neutron Stars, Marmaris, Turkey, June 2004 | null | null | null | gr-qc astro-ph | null | This is a progress report on our study of the coupling of first-order radial
and non-radial relativistic perturbations of a static spherical star. Our goal
is to investigate the effects of this coupling on the gravitational wave signal
of neutron stars. In particular, we are looking for the existence of resonances
an... | [
{
"created": "Wed, 3 Nov 2004 23:05:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Passamonti",
"Andrea",
""
],
[
"Bruni",
"Marco",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Sopuerta",
"Carlos F.",
""
]
] | This is a progress report on our study of the coupling of first-order radial and non-radial relativistic perturbations of a static spherical star. Our goal is to investigate the effects of this coupling on the gravitational wave signal of neutron stars. In particular, we are looking for the existence of resonances and ... |
gr-qc/9804029 | Bernard Julia | B. Julia and S. Silva (ENS Paris) | Currents and Superpotentials in classical gauge invariant theories I.
Local results with applications to Perfect Fluids and General Relativity | 64 pages, LaTeX. Version 2 has two more references and one misprint
corrected. Accepted in Classical and Quantum Gravity | Class.Quant.Grav. 15 (1998) 2173-2215 | 10.1088/0264-9381/15/8/006 | LPTENS/98/06 | gr-qc hep-th | null | E. Noether's general analysis of conservation laws has to be completed in a
Lagrangian theory with local gauge invariance. Bulk charges are replaced by
fluxes of superpotentials. Gauge invariant bulk charges may subsist when
distinguished one-dimensional subgroups are present. As a first illustration we
propose a new... | [
{
"created": "Fri, 10 Apr 1998 10:50:53 GMT",
"version": "v1"
},
{
"created": "Thu, 28 May 1998 15:12:45 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Julia",
"B.",
"",
"ENS Paris"
],
[
"Silva",
"S.",
"",
"ENS Paris"
]
] | E. Noether's general analysis of conservation laws has to be completed in a Lagrangian theory with local gauge invariance. Bulk charges are replaced by fluxes of superpotentials. Gauge invariant bulk charges may subsist when distinguished one-dimensional subgroups are present. As a first illustration we propose a new {... |
2012.00297 | Roger Hurtado PhD | Roger Hurtado and Robel Arenas | Hypergeometric viable models in $f(R)$ gravity | 10 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmologically viable hypergeometric model in the modified gravity theory
$f(R)$ is found from the need for asintoticity towards $\Lambda$CDM, the
existence of an inflection point in the $f(R)$ curve, and the conditions of
viability given by the phase space curves $(m, r)$, where $m$ and $r$ are
characteristic func... | [
{
"created": "Tue, 1 Dec 2020 06:37:04 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Hurtado",
"Roger",
""
],
[
"Arenas",
"Robel",
""
]
] | A cosmologically viable hypergeometric model in the modified gravity theory $f(R)$ is found from the need for asintoticity towards $\Lambda$CDM, the existence of an inflection point in the $f(R)$ curve, and the conditions of viability given by the phase space curves $(m, r)$, where $m$ and $r$ are characteristic functi... |
1107.5802 | Joao Paulo Pitelli Manoel | J.P.M. Pitelli and P.S. Letelier | Modeling the quantum evolution of the universe through classical matter | updated version as accepted by Gen. Relativ. Gravit | General Relativity and Gravitation, 2013 | 10.1007/s10714-013-1531-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the canonical quantization of the
Friedmann-Lema\^itre-Robertson-Walker (FLRW) filled with a perfect fluid leads
to nonsingular universes which, for later times, behave as their classical
counterpart. This means that the expectation value of the scale factor $<a>(t)$
never vanishes and, as $t\to... | [
{
"created": "Thu, 28 Jul 2011 19:32:49 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2011 18:48:33 GMT",
"version": "v2"
},
{
"created": "Wed, 8 May 2013 15:07:39 GMT",
"version": "v3"
}
] | 2013-05-09 | [
[
"Pitelli",
"J. P. M.",
""
],
[
"Letelier",
"P. S.",
""
]
] | It is well known that the canonical quantization of the Friedmann-Lema\^itre-Robertson-Walker (FLRW) filled with a perfect fluid leads to nonsingular universes which, for later times, behave as their classical counterpart. This means that the expectation value of the scale factor $<a>(t)$ never vanishes and, as $t\to\i... |
gr-qc/0305065 | Ujjal Debnath | Subenoy Chakraborty, N. C. Chakraborty and Ujjal Debnath | A Quintessence Problem in Brans-Dicke Theory with Varying Speed of Light | 8 Latex pages, 6 figures, Revtex style | Int.J.Mod.Phys.D12:325-335,2003 | 10.1142/S0218271803002792 | null | gr-qc | null | It is shown that minimally coupled scalar field in Brans-Dicke theory with
varying speed of light can solve the quintessence problem and it is possible to
have a non-decelerated expansion of the present universe with BD-theory for
anisotropic models without any matter.
| [
{
"created": "Fri, 16 May 2003 15:49:35 GMT",
"version": "v1"
}
] | 2008-11-07 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Chakraborty",
"N. C.",
""
],
[
"Debnath",
"Ujjal",
""
]
] | It is shown that minimally coupled scalar field in Brans-Dicke theory with varying speed of light can solve the quintessence problem and it is possible to have a non-decelerated expansion of the present universe with BD-theory for anisotropic models without any matter. |
0806.1328 | \"Ozg\"ur Acik | \"O. A\c{c}{\i}k, \"U. Ertem, M. \"Onder and A. Ver\c{c}in | First-order symmetries of Dirac equation in curved background: a unified
dynamical symmetry condition | 13 pages, put into sections and subsections format, added a
conclusion part. Published version | Class.Quant.Grav.26:075001,2009 | 10.1088/0264-9381/26/7/075001 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/3.0/ | It has been shown that, for all dimensions and signatures, the most general
first-order linear symmetry operators for the Dirac equation including
interaction with Maxwell field in curved background are given in terms of
Killing-Yano (KY) forms. As a general gauge invariant condition it is found
that among all KY-for... | [
{
"created": "Sun, 8 Jun 2008 13:47:42 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Mar 2009 14:04:16 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Açık",
"Ö.",
""
],
[
"Ertem",
"Ü.",
""
],
[
"Önder",
"M.",
""
],
[
"Verçin",
"A.",
""
]
] | It has been shown that, for all dimensions and signatures, the most general first-order linear symmetry operators for the Dirac equation including interaction with Maxwell field in curved background are given in terms of Killing-Yano (KY) forms. As a general gauge invariant condition it is found that among all KY-forms... |
2402.06836 | Aaron Johnson | Aaron D. Johnson, Katerina Chatziioannou, Will M. Farr | Source Confusion from Neutron Star Binaries in Ground-Based
Gravitational Wave Detectors is Minimal | 20 pages, 9 figures, 4 tables | null | 10.1103/PhysRevD.109.084015 | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Upgrades beyond the current second generation of ground-based gravitational
wave detectors will allow them to observe tens of thousands neutron star and
black hole binaries. Given the typical minute-to-hour duration of neutron star
signals in the detector frequency band, a number of them will overlap in the
time-freq... | [
{
"created": "Fri, 9 Feb 2024 23:54:47 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2024 19:36:17 GMT",
"version": "v2"
}
] | 2024-04-11 | [
[
"Johnson",
"Aaron D.",
""
],
[
"Chatziioannou",
"Katerina",
""
],
[
"Farr",
"Will M.",
""
]
] | Upgrades beyond the current second generation of ground-based gravitational wave detectors will allow them to observe tens of thousands neutron star and black hole binaries. Given the typical minute-to-hour duration of neutron star signals in the detector frequency band, a number of them will overlap in the time-freque... |
gr-qc/0411132 | Stoytcho Yazadjiev | Stoytcho S. Yazadjiev | Charged perfect fluid configurations with a dilaton field | 9 pages, LaTex, v2 typos corrected | Mod.Phys.Lett.A20:821-831,2005 | 10.1142/S0217732305017056 | null | gr-qc | null | We examine static charged perfect fluid configurations in the presence of a
dilaton field. A method for construction of interior solutions is given. An
explicit example of an interior solution which matches continuously the
external Gibbons-Maeda-Garfinkle-Horowitz-Strominger solution is presented.
Extremely charged ... | [
{
"created": "Sun, 28 Nov 2004 11:22:41 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Dec 2004 09:37:20 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | We examine static charged perfect fluid configurations in the presence of a dilaton field. A method for construction of interior solutions is given. An explicit example of an interior solution which matches continuously the external Gibbons-Maeda-Garfinkle-Horowitz-Strominger solution is presented. Extremely charged pe... |
gr-qc/0108022 | Ioannis Kouletsis | Ioannis Kouletsis and Karel. V. Kuchar | Diffeomorphisms as Symplectomorphisms in History Phase Space: Bosonic
String Model | 45 pages, no figures | Phys.Rev. D65 (2002) 125026 | 10.1103/PhysRevD.65.125026 | null | gr-qc | null | The structure of the history phase space $\cal G$ of a covariant field system
and its history group (in the sense of Isham and Linden) is analyzed on an
example of a bosonic string. The history space $\cal G$ includes the time map
$\sf T$ from the spacetime manifold (the two-sheet) $\cal Y$ to a
one-dimensional time ... | [
{
"created": "Wed, 8 Aug 2001 10:15:29 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2001 09:49:55 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kouletsis",
"Ioannis",
""
],
[
"Kuchar",
"Karel. V.",
""
]
] | The structure of the history phase space $\cal G$ of a covariant field system and its history group (in the sense of Isham and Linden) is analyzed on an example of a bosonic string. The history space $\cal G$ includes the time map $\sf T$ from the spacetime manifold (the two-sheet) $\cal Y$ to a one-dimensional time ma... |
1603.06146 | Carlos A. R. Herdeiro | Emanuele Berti, Vitor Cardoso, Luis C. B. Crispino, Leonardo
Gualtieri, Carlos Herdeiro and Ulrich Sperhake | Numerical Relativity and High Energy Physics: Recent Developments | 46 pages, 6 figures; Submitted to a Special Issue of IJMPD on
Selected Papers of the III Amazonian Symposium on Physics | null | 10.1142/S0218271816410224 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent progress in the application of numerical relativity
techniques to astrophysics and high-energy physics. We focus on some
developments that took place within the "Numerical Relativity and High Energy
Physics" network, a Marie Curie IRSES action that we coordinated, namely: spin
evolution in black hole... | [
{
"created": "Sat, 19 Mar 2016 21:19:04 GMT",
"version": "v1"
}
] | 2016-08-17 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Crispino",
"Luis C. B.",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | We review recent progress in the application of numerical relativity techniques to astrophysics and high-energy physics. We focus on some developments that took place within the "Numerical Relativity and High Energy Physics" network, a Marie Curie IRSES action that we coordinated, namely: spin evolution in black hole b... |
2110.04610 | Kirill Kobialko | Kirill Kobialko and Dmitri Gal'tsov | Photon regions in stationary axisymmetric spacetimes and umbilic
conditions | 14 pages, to be submitted to the Proceedings of the 16th Marcel
Grossmann meeting | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the fundamentals of the recently proposed geometric description of
photon regions in terms of foliation into fundamental photon hypersurfaces,
which satisfies the umbilic condition for the subbundle of the tangent bundle
defined by the generalized impact parameter.
| [
{
"created": "Sat, 9 Oct 2021 16:49:56 GMT",
"version": "v1"
}
] | 2021-10-12 | [
[
"Kobialko",
"Kirill",
""
],
[
"Gal'tsov",
"Dmitri",
""
]
] | We present the fundamentals of the recently proposed geometric description of photon regions in terms of foliation into fundamental photon hypersurfaces, which satisfies the umbilic condition for the subbundle of the tangent bundle defined by the generalized impact parameter. |
1908.00017 | Venkatesa Chandrasekaran | Venkatesa Chandrasekaran, Kartik Prabhu | Symmetries, charges and conservation laws at causal diamonds in general
relativity | v2: minor clarifications; v1: 27 pages, 1 figure | JHEP 10 (2019) 229 | 10.1007/JHEP10(2019)229 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the covariant phase space of vacuum general relativity at the null
boundary of causal diamonds. The past and future components of such a null
boundary each have an infinite-dimensional symmetry algebra consisting of
diffeomorphisms of the $2$-sphere and boost supertranslations corresponding to
angle-dependen... | [
{
"created": "Wed, 31 Jul 2019 18:00:04 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Nov 2019 16:58:11 GMT",
"version": "v2"
}
] | 2019-11-12 | [
[
"Chandrasekaran",
"Venkatesa",
""
],
[
"Prabhu",
"Kartik",
""
]
] | We study the covariant phase space of vacuum general relativity at the null boundary of causal diamonds. The past and future components of such a null boundary each have an infinite-dimensional symmetry algebra consisting of diffeomorphisms of the $2$-sphere and boost supertranslations corresponding to angle-dependent ... |
gr-qc/9905009 | Zahid Zakir | Zahid Zakir (CTPA) | New Equations for Gravitation with Riemann Tensor and 4-Index
Energy-Momentum Tensors for Gravitation and Matter | Published in: "Z.Zakir (2003) Structure of Space-Time and Matter.
CTPA, Tashkent" | Theor. Phys. Astrophys. and Cosmol. 5 (2010) 14 | 10.9751/TPAC.3600-017 | null | gr-qc | null | A generalized version of the Einstein equations in the 4-index form,
containing the Riemann tensor linearly, is derived. It is shown, that the
gravitational energy-momentum density tensor outside a source is represented
across the Weyl tensor vanishing at the 2-index contraction. The 4-index
energy-momentum density t... | [
{
"created": "Mon, 3 May 1999 19:57:01 GMT",
"version": "v1"
},
{
"created": "Tue, 4 May 1999 04:06:22 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Jul 1999 21:19:55 GMT",
"version": "v3"
},
{
"created": "Fri, 17 Oct 2003 13:27:04 GMT",
"version": "v4"
}
] | 2012-10-09 | [
[
"Zakir",
"Zahid",
"",
"CTPA"
]
] | A generalized version of the Einstein equations in the 4-index form, containing the Riemann tensor linearly, is derived. It is shown, that the gravitational energy-momentum density tensor outside a source is represented across the Weyl tensor vanishing at the 2-index contraction. The 4-index energy-momentum density ten... |
2106.11066 | Anindya Biswas | Anindya Biswas | Joule-Thomson expansion of $AdS$ black holes in
Einstein-power-Yang-Mills gravity | 17 pages, 25 figures, comments are welcome | null | 10.1088/1402-4896/ac2b42 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper we study Joule-Thomson $(JT)$ expansion of non-linearly charged
$AdS$ black holes in Einstein-power-Yang-Mills (EPYM) gravity in $D$
dimensions. Within the framework of extended phase space thermodynamics we
identify the cosmological constant as thermodynamic pressure and the black hole
mass with the en... | [
{
"created": "Thu, 17 Jun 2021 21:32:54 GMT",
"version": "v1"
}
] | 2021-11-17 | [
[
"Biswas",
"Anindya",
""
]
] | In this paper we study Joule-Thomson $(JT)$ expansion of non-linearly charged $AdS$ black holes in Einstein-power-Yang-Mills (EPYM) gravity in $D$ dimensions. Within the framework of extended phase space thermodynamics we identify the cosmological constant as thermodynamic pressure and the black hole mass with the enth... |
1009.0521 | Alessandro Nagar | Luca Baiotti, Thibault Damour, Bruno Giacomazzo, Alessandro Nagar and
Luciano Rezzolla | Analytic modelling of tidal effects in the relativistic inspiral of
binary neutron stars | 4 pages, 2 figures. Version published in Phys. Rev. Lett | Phys.Rev.Lett.105:261101,2010 | 10.1103/PhysRevLett.105.261101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To detect the gravitational-wave (GW) signal from binary neutron stars and
extract information about the equation of state of matter at nuclear density,
it is necessary to match the signal with a bank of accurate templates. We
present the two longest (to date) general-relativistic simulations of
equal-mass binary neu... | [
{
"created": "Thu, 2 Sep 2010 19:55:46 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2010 15:41:59 GMT",
"version": "v2"
}
] | 2010-12-28 | [
[
"Baiotti",
"Luca",
""
],
[
"Damour",
"Thibault",
""
],
[
"Giacomazzo",
"Bruno",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | To detect the gravitational-wave (GW) signal from binary neutron stars and extract information about the equation of state of matter at nuclear density, it is necessary to match the signal with a bank of accurate templates. We present the two longest (to date) general-relativistic simulations of equal-mass binary neutr... |
2211.09886 | Carolina Benone | Haroldo C. D. Lima Junior, Carolina L. Benone, Lu\'is C. B. Crispino | Scalar scattering by black holes and wormholes | null | Eur. Phys. J. C 82 (2022) 7, 638 | 10.1140/epjc/s10052-022-10576-7 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study the scattering of monochromatic planar scalar waves in a geometry
that interpolates between the Schwarzschild solution, regular black holes and
traversable wormhole spacetimes. We employ the partial waves approach to
compute the differential scattering cross section of the regular black hole, as
well as of t... | [
{
"created": "Thu, 17 Nov 2022 20:48:56 GMT",
"version": "v1"
}
] | 2022-11-21 | [
[
"Junior",
"Haroldo C. D. Lima",
""
],
[
"Benone",
"Carolina L.",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | We study the scattering of monochromatic planar scalar waves in a geometry that interpolates between the Schwarzschild solution, regular black holes and traversable wormhole spacetimes. We employ the partial waves approach to compute the differential scattering cross section of the regular black hole, as well as of the... |
1607.00118 | Yoshimasa Kurihara | Yoshimasa Kurihara | Geometrothermodynamics for Black holes and de Sitter Space | 14 pages | General Relativity and Gravitation 50 (2) (2018) 20 | 10.1007/s10714-018-2341-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this report, a general method to extract thermodynamic quantities from
solutions of the Einstein equation is developed. In 1994, Wald established that
the entropy of a black hole could be identified as a Noether charge associated
with a Killing vector of a global space-time (pseudo-Riemann) manifold. We
reconstruc... | [
{
"created": "Fri, 1 Jul 2016 06:21:33 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2016 08:54:59 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Feb 2017 15:11:06 GMT",
"version": "v3"
},
{
"created": "Mon, 6 Mar 2017 16:35:03 GMT",
"version": "v4"
},
{
"crea... | 2018-01-29 | [
[
"Kurihara",
"Yoshimasa",
""
]
] | In this report, a general method to extract thermodynamic quantities from solutions of the Einstein equation is developed. In 1994, Wald established that the entropy of a black hole could be identified as a Noether charge associated with a Killing vector of a global space-time (pseudo-Riemann) manifold. We reconstruct ... |
gr-qc/9309012 | James Hartle | James B. Hartle | Unitarity and Causality in Generalized Quantum Mechanics for Non-Chronal
Spacetimes | 40pages, UCSBTH92-04 | Phys.Rev. D49 (1994) 6543-6555 | 10.1103/PhysRevD.49.6543 | null | gr-qc hep-th | null | Spacetime must be foliable by spacelike surfaces for the quantum mechanics of
matter fields to be formulated in terms of a unitarily evolving state vector
defined on spacelike surfaces. When a spacetime cannot be foliated by spacelike
surfaces, as in the case of spacetimes with closed timelike curves, a more
general ... | [
{
"created": "Mon, 13 Sep 1993 22:08:57 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Hartle",
"James B.",
""
]
] | Spacetime must be foliable by spacelike surfaces for the quantum mechanics of matter fields to be formulated in terms of a unitarily evolving state vector defined on spacelike surfaces. When a spacetime cannot be foliated by spacelike surfaces, as in the case of spacetimes with closed timelike curves, a more general fo... |
gr-qc/0209056 | Nicholas G. Phillips | Nicholas G Phillips and B. L. Hu | Noise Kernel and Stress Energy Bi-Tensor of Quantum Fields in Hot Flat
Space and Gaussian Approximation in the Optical Schwarzschild Metric | 21 pages, RevTeX 4 | Phys.Rev. D67 (2003) 104002 | 10.1103/PhysRevD.67.104002 | null | gr-qc | null | Continuing our investigation of the regularization of the noise kernel in
curved spacetimes [N. G. Phillips and B. L. Hu, Phys. Rev. D {\bf 63}, 104001
(2001)] we adopt the modified point separation scheme for the class of optical
spacetimes using the Gaussian approximation for the Green functions a la
Bekenstein-Par... | [
{
"created": "Tue, 17 Sep 2002 18:10:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Phillips",
"Nicholas G",
""
],
[
"Hu",
"B. L.",
""
]
] | Continuing our investigation of the regularization of the noise kernel in curved spacetimes [N. G. Phillips and B. L. Hu, Phys. Rev. D {\bf 63}, 104001 (2001)] we adopt the modified point separation scheme for the class of optical spacetimes using the Gaussian approximation for the Green functions a la Bekenstein-Parke... |
2203.09092 | Alfredo Herrera-Aguilar | Pritam Banerjee, Alfredo Herrera-Aguilar, Mehrab Momennia and Ulises
Nucamendi | Mass and spin of Kerr black holes in terms of observational quantities:
The dragging effect on the redshift | 14 pages in latex, 3 figures | Phys. Rev. D 105 (2022) 124037 | 10.1103/PhysRevD.105.124037 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we elaborate on the development of a general relativistic
formalism that allows one to analytically express the mass and spin parameters
of the Kerr black hole in terms of observational data: the total redshift and
blueshift of photons emitted by geodesic massive particles revolving the black
hole and t... | [
{
"created": "Thu, 17 Mar 2022 05:27:52 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Jun 2022 00:13:44 GMT",
"version": "v2"
}
] | 2022-06-30 | [
[
"Banerjee",
"Pritam",
""
],
[
"Herrera-Aguilar",
"Alfredo",
""
],
[
"Momennia",
"Mehrab",
""
],
[
"Nucamendi",
"Ulises",
""
]
] | In this work, we elaborate on the development of a general relativistic formalism that allows one to analytically express the mass and spin parameters of the Kerr black hole in terms of observational data: the total redshift and blueshift of photons emitted by geodesic massive particles revolving the black hole and the... |
gr-qc/9709005 | Madjid Aboolhassani | Majid Abolhasani and Mehdi Golshani | Bohmian Time Versus Probabilistic Time | 8 pages, Revtex, no figures | null | null | null | gr-qc | null | One of the basic peoblems of quantum cosmology is the problem of time.
Various solutions have been proposed for this problem. One approach is to use
the Bohmian time. Another Approach is to use the probabilistic time which was
recently introduced by Castagnino. We consider both of these definitions as
generalizations... | [
{
"created": "Wed, 3 Sep 1997 10:10:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Abolhasani",
"Majid",
""
],
[
"Golshani",
"Mehdi",
""
]
] | One of the basic peoblems of quantum cosmology is the problem of time. Various solutions have been proposed for this problem. One approach is to use the Bohmian time. Another Approach is to use the probabilistic time which was recently introduced by Castagnino. We consider both of these definitions as generalizations o... |
2205.12942 | James Wheeler | James Wheeler | On the Definition of Black Holes: Bridging the Gap Between Black Holes
and Singularities | 35 pages, 14 figures | null | 10.1016/j.aop.2023.169356 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel perspective on defining black holes designed to be more broadly
applicable outside of asymptotically flat spacetimes, in the context of
classical general relativity, is presented, discussed, and characterized. The
construction formalizes the heuristic idea that black holes are the "past
Cauchy development of ... | [
{
"created": "Wed, 25 May 2022 17:45:47 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2023 21:58:42 GMT",
"version": "v2"
}
] | 2023-06-06 | [
[
"Wheeler",
"James",
""
]
] | A novel perspective on defining black holes designed to be more broadly applicable outside of asymptotically flat spacetimes, in the context of classical general relativity, is presented, discussed, and characterized. The construction formalizes the heuristic idea that black holes are the "past Cauchy development of th... |
2308.08997 | Mikhail Khlopunov | M. Khlopunov | Non-local tails in radiation in odd dimensions | 44 pages, 15 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Huygens principle violation in a spacetime of odd dimensions leads to the
fact that the retarded massless fields of localised sources depend on their
history of motion preceding the retarded time. This non-local character of
retarded fields should result into the formation of tail signals in the
radiation of localise... | [
{
"created": "Thu, 17 Aug 2023 14:09:02 GMT",
"version": "v1"
}
] | 2023-08-23 | [
[
"Khlopunov",
"M.",
""
]
] | Huygens principle violation in a spacetime of odd dimensions leads to the fact that the retarded massless fields of localised sources depend on their history of motion preceding the retarded time. This non-local character of retarded fields should result into the formation of tail signals in the radiation of localised ... |
2003.04305 | Guo-Ping Li | Xin-Yun Hu, Ke-Jian He, Zhong-Hua Li, Guo-Ping Li | Thermodynamics and weak cosmic censorship conjecture of charged AdS
black hole in the Rastall gravity with pressure | 4 figures; accepted by Chin.Phys. B | null | 10.1088/1674-1056/ab7daa | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Treating the cosmological constant as a dynamical variable, we investigate
the thermodynamics and weak cosmic censorship conjecture (WCCC) of a charged
AdS black hole (BH) in the Rastall gravity. We determine the energy momentum
relation of charged fermion at the horizon of the BH by using the Dirac
equation. Based o... | [
{
"created": "Sat, 7 Mar 2020 08:16:59 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Hu",
"Xin-Yun",
""
],
[
"He",
"Ke-Jian",
""
],
[
"Li",
"Zhong-Hua",
""
],
[
"Li",
"Guo-Ping",
""
]
] | Treating the cosmological constant as a dynamical variable, we investigate the thermodynamics and weak cosmic censorship conjecture (WCCC) of a charged AdS black hole (BH) in the Rastall gravity. We determine the energy momentum relation of charged fermion at the horizon of the BH by using the Dirac equation. Based on ... |
gr-qc/9802028 | Shinji Mukohyama | Shinji Mukohyama, Masafumi Seriu and Hideo Kodama | Entanglement thermodynamics | Latex, 6 pages, Presented at 7th Workshop on General Relativity and
Gravitation, Kyoto, Japan, 27-30 Oct 1997 | null | null | null | gr-qc | null | Entanglement entropy is a statistical entropy measuring information loss due
to coarse-graining corresponding to a spatial division of a system. In this
paper we construct a thermodynamics (entanglement thermodynamics) which
includes the entanglement entropy as the entropy variable, for a massless
scalar field in Min... | [
{
"created": "Fri, 13 Feb 1998 08:05:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mukohyama",
"Shinji",
""
],
[
"Seriu",
"Masafumi",
""
],
[
"Kodama",
"Hideo",
""
]
] | Entanglement entropy is a statistical entropy measuring information loss due to coarse-graining corresponding to a spatial division of a system. In this paper we construct a thermodynamics (entanglement thermodynamics) which includes the entanglement entropy as the entropy variable, for a massless scalar field in Minko... |
2201.11784 | K{\i}van\c{c} \.Ibrahim \"Unl\"ut\"urk | K{\i}van\c{c} \.I. \"Unl\"ut\"urk and Cem Yeti\c{s}mi\c{s}o\u{g}lu | A model of non-minimally coupled gravitation and electromagnetism in
(1+2) dimensions | This work is dedicated to Tekin Dereli for his 72nd birthday and will
soon appear in his Festschrift in J. Phys. Conf. Ser | null | 10.1088/1742-6596/2191/1/012021 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Following earlier works of Dereli and collaborators, we study a three
dimensional toy model where we extend the topologically massive gravity with
electrodynamics by the most general $RF^2$-type non-minimal coupling terms.
Here $R$ denotes the possible curvature terms and $F$ denotes the
electromagnetic 2-form. We de... | [
{
"created": "Thu, 27 Jan 2022 19:53:22 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Ünlütürk",
"Kıvanç İ.",
""
],
[
"Yetişmişoğlu",
"Cem",
""
]
] | Following earlier works of Dereli and collaborators, we study a three dimensional toy model where we extend the topologically massive gravity with electrodynamics by the most general $RF^2$-type non-minimal coupling terms. Here $R$ denotes the possible curvature terms and $F$ denotes the electromagnetic 2-form. We deri... |
2108.13463 | Yen-Wei Liu | Yi-Zen Chu and Yen-Wei Liu | Cherenkov Gravitational Radiation During the Radiation Era | 22 pages, 3 figures; version accepted for publication in Universe | Universe 2021, 7(11), 437 | 10.3390/universe7110437 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cherenkov radiation may occur whenever the source is moving faster than the
waves it generates. In a radiation dominated universe, with equation-of-state
$w = 1/3$, we have recently shown that the Bardeen scalar-metric perturbations
contribute to the linearized Weyl tensor in such a manner that its wavefront
propagat... | [
{
"created": "Mon, 30 Aug 2021 18:18:40 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 2021 07:29:15 GMT",
"version": "v2"
}
] | 2021-11-18 | [
[
"Chu",
"Yi-Zen",
""
],
[
"Liu",
"Yen-Wei",
""
]
] | Cherenkov radiation may occur whenever the source is moving faster than the waves it generates. In a radiation dominated universe, with equation-of-state $w = 1/3$, we have recently shown that the Bardeen scalar-metric perturbations contribute to the linearized Weyl tensor in such a manner that its wavefront propagates... |
gr-qc/9706050 | Uwe Guenther | U. Guenther, A. Zhuk | Gravitational excitons from extra dimensions | Revised version --- 12 references added, Introduction enlarged, 20
pages, LaTeX, to appear in Phys.Rev.D56 (15.11.97) | Phys.Rev.D56:6391-6402,1997 | 10.1103/PhysRevD.56.6391 | null | gr-qc astro-ph hep-th | null | Inhomogeneous multidimensional cosmological models with a higher dimensional
space-time manifold are investigated under dimensional reduction. In the
Einstein conformal frame, small excitations of the scale factors of the
internal spaces near minima of an effective potential have a form of massive
scalar fields in th... | [
{
"created": "Mon, 16 Jun 1997 22:07:36 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 1997 09:39:41 GMT",
"version": "v2"
}
] | 2011-09-09 | [
[
"Guenther",
"U.",
""
],
[
"Zhuk",
"A.",
""
]
] | Inhomogeneous multidimensional cosmological models with a higher dimensional space-time manifold are investigated under dimensional reduction. In the Einstein conformal frame, small excitations of the scale factors of the internal spaces near minima of an effective potential have a form of massive scalar fields in the ... |
2309.15778 | Adailton Araújo Filho | A. A. Ara\'ujo Filho, J. A. A. S. Reis, H. Hassanabadi | Exploring antisymmetric tensor effects on black hole shadows and
quasinormal frequencies | 32 pages, 6 figures and 6 tables -- accepted for publication in
Journal of Cosmology and Astroparticle Physics | JCAP 05 (2024) 029 | 10.1088/1475-7516/2024/05/029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study explores the impact of antisymmetric tensor effects on spherically
symmetric black holes, investigating photon spheres, shadows, emission rate and
quasinormal frequencies in relation to a parameter which triggers the Lorentz
symmetry breaking. We examine these configurations without and with the
presence o... | [
{
"created": "Wed, 27 Sep 2023 16:52:47 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2023 15:53:49 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Mar 2024 17:49:49 GMT",
"version": "v3"
}
] | 2024-05-03 | [
[
"Filho",
"A. A. Araújo",
""
],
[
"Reis",
"J. A. A. S.",
""
],
[
"Hassanabadi",
"H.",
""
]
] | This study explores the impact of antisymmetric tensor effects on spherically symmetric black holes, investigating photon spheres, shadows, emission rate and quasinormal frequencies in relation to a parameter which triggers the Lorentz symmetry breaking. We examine these configurations without and with the presence of ... |
1812.02547 | Alessandro Tronconi | Alexander Y. Kamenshchik, Alessandro Tronconi, Tereza Vardanyan,
Giovanni Venturi | Non-Canonical Inflation and Primordial Black Holes Production | 14 pages, 1 figure. References added. Final version published on PLB | null | 10.1016/j.physletb.2019.02.036 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a mechanism for the amplification of the inflationary scalar
perturbation when the inflaton field action is non-canonical, i.e. the inflaton
kinetic term has a non-standard form. For such a case the speed of sound of the
perturbations generated during inflation is less than one and in general
changes with ti... | [
{
"created": "Thu, 6 Dec 2018 14:26:43 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2019 13:31:26 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Kamenshchik",
"Alexander Y.",
""
],
[
"Tronconi",
"Alessandro",
""
],
[
"Vardanyan",
"Tereza",
""
],
[
"Venturi",
"Giovanni",
""
]
] | We study a mechanism for the amplification of the inflationary scalar perturbation when the inflaton field action is non-canonical, i.e. the inflaton kinetic term has a non-standard form. For such a case the speed of sound of the perturbations generated during inflation is less than one and in general changes with time... |
2107.05880 | Andronikos Paliathanasis | Andronikos Paliathanasis | Dynamics in interacting scalar-torsion theory | 19 pages, 4 figures, to appear in Universe, Special Issue: "Probing
the Dark Universe with Theory and Observations" | Universe 2021, 7(7), 244 | 10.3390/universe7070244 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In a spatially flat \ Friedmann--Lema\^{\i}tre--Robertson--Walker background
space we consider a scalar-torsion gravitational model which has similar
properties with the dilaton theory. This teleparallel model is invariant under
a discrete transformation similar to the Gasperini-Veneziano duality
transformation. More... | [
{
"created": "Tue, 13 Jul 2021 07:05:11 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 2021 07:29:14 GMT",
"version": "v2"
}
] | 2021-07-19 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | In a spatially flat \ Friedmann--Lema\^{\i}tre--Robertson--Walker background space we consider a scalar-torsion gravitational model which has similar properties with the dilaton theory. This teleparallel model is invariant under a discrete transformation similar to the Gasperini-Veneziano duality transformation. Moreov... |
2101.03520 | Silvia Vicentini | Silvia Vicentini, Massimiliano Rinaldi | Vacuum decay and quadratic gravity: the massive case | calculation details added, comments added, to appear in GERG; 31
pages | Gen Relativ Gravit 54, 22 (2022) | 10.1007/s10714-022-02907-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | False vacuum decay in field theory may be formulated as a boundary value
problem in Euclidean space. In a previous work, we studied its solution in
single scalar field theories with quadratic gravity and used it to find
obstructions to vacuum decay. For simplicity, we focused on massless scalar
fields and false vacua... | [
{
"created": "Sun, 10 Jan 2021 10:58:56 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 11:15:09 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jul 2021 12:05:09 GMT",
"version": "v3"
},
{
"created": "Fri, 4 Feb 2022 10:49:44 GMT",
"version": "v4"
}
] | 2022-02-22 | [
[
"Vicentini",
"Silvia",
""
],
[
"Rinaldi",
"Massimiliano",
""
]
] | False vacuum decay in field theory may be formulated as a boundary value problem in Euclidean space. In a previous work, we studied its solution in single scalar field theories with quadratic gravity and used it to find obstructions to vacuum decay. For simplicity, we focused on massless scalar fields and false vacua w... |
2203.11165 | Ali Aghamohammadi | Zahra Ghadiri, Ali Aghamohammadi and Abdollah Refaei | Constraints of anisotropy on warm power-law inflation in light of Planck
results | 16 page, 6 figures | Iranian Journal of Astronomy and Astrophysics 2021 | 10.22128/IJAA.2021.479.1103 | Vol. 8, No. 1, Spring 2021 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article, we examine the effects of anisotropy on a model of canonical
warm inflation with the power-law potential. The results of this model are
compared to Planck satellite observational data. Using a conventional local
scalar fi?eld in the Bianchi type I metric, the slow-roll conditions and the
suitable reg... | [
{
"created": "Mon, 21 Mar 2022 17:44:36 GMT",
"version": "v1"
}
] | 2022-05-05 | [
[
"Ghadiri",
"Zahra",
""
],
[
"Aghamohammadi",
"Ali",
""
],
[
"Refaei",
"Abdollah",
""
]
] | In this article, we examine the effects of anisotropy on a model of canonical warm inflation with the power-law potential. The results of this model are compared to Planck satellite observational data. Using a conventional local scalar fi?eld in the Bianchi type I metric, the slow-roll conditions and the suitable regio... |
gr-qc/9801051 | S. Antoci | S. Antoci | Microscopic Fields and Macroscopic Averages in Einstein's Unified Field
Theory | 22 pages, plain TeX | AnnalesFond.Broglie21:11-38,1996 | null | null | gr-qc | null | The relation between microscopic and macroscopic entities in the generally
covariant theories is considered, and it is argued that a sensible definition
of the macroscopic averages requires a restriction of the allowed
transformations of coordinates. Spacetime averages of the geometric objects of
Einstein's unified f... | [
{
"created": "Thu, 15 Jan 1998 09:29:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Antoci",
"S.",
""
]
] | The relation between microscopic and macroscopic entities in the generally covariant theories is considered, and it is argued that a sensible definition of the macroscopic averages requires a restriction of the allowed transformations of coordinates. Spacetime averages of the geometric objects of Einstein's unified fie... |
1108.4242 | Shinji Tsujikawa | Antonio De Felice, Tsutomu Kobayashi, Shinji Tsujikawa | Effective gravitational couplings for cosmological perturbations in the
most general scalar-tensor theories with second-order field equations | 12 pages, no figures | Phys.Lett.B706:123-133, 2011 | 10.1016/j.physletb.2011.11.028 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Horndeski's most general scalar-tensor theories the equations of
scalar density perturbations are derived in the presence of non-relativistic
matter minimally coupled to gravity. Under a quasi-static approximation on
sub-horizon scales we obtain the effective gravitational coupling $G_{eff}$
associated with th... | [
{
"created": "Mon, 22 Aug 2011 06:57:00 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Nov 2011 15:23:17 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"De Felice",
"Antonio",
""
],
[
"Kobayashi",
"Tsutomu",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | In the Horndeski's most general scalar-tensor theories the equations of scalar density perturbations are derived in the presence of non-relativistic matter minimally coupled to gravity. Under a quasi-static approximation on sub-horizon scales we obtain the effective gravitational coupling $G_{eff}$ associated with the ... |
1809.00795 | Masashi Kimura | Masashi Kimura and Takahiro Tanaka | Stability analysis of black holes by the $S$-deformation method for
coupled systems | 26 pages, 9 figures, v2: minor revisions, v3: minor revisions, to
appear in Classical and Quantum Gravity | null | 10.1088/1361-6382/ab0193 | KUNS-2735, YITP-18-97 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple method to prove the linear mode stability of a black hole
when the perturbed field equations take the form of a system of coupled
Schr\"odinger equations. The linear mode stability of the spacetime is
guaranteed by the existence of an appropriate $S$-deformation. Such an
$S$-deformation is related... | [
{
"created": "Tue, 4 Sep 2018 04:50:27 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2018 05:20:27 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jan 2019 06:23:10 GMT",
"version": "v3"
}
] | 2019-02-20 | [
[
"Kimura",
"Masashi",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We propose a simple method to prove the linear mode stability of a black hole when the perturbed field equations take the form of a system of coupled Schr\"odinger equations. The linear mode stability of the spacetime is guaranteed by the existence of an appropriate $S$-deformation. Such an $S$-deformation is related t... |
0708.0450 | Hiroyuki Nakano | Hiroyuki Nakano, Kunihito Ioka | Second Order Quasi-Normal Mode of the Schwarzschild Black Hole | 23 pages, no figure | Phys.Rev.D76:084007,2007 | 10.1103/PhysRevD.76.084007 | null | gr-qc astro-ph | null | We formulate and calculate the second order quasi-normal modes (QNMs) of a
Schwarzschild black hole (BH). Gravitational wave (GW) from a distorted BH, so
called ringdown, is well understood as QNMs in general relativity. Since QNMs
from binary BH mergers will be detected with high signal-to-noise ratio by GW
detector... | [
{
"created": "Fri, 3 Aug 2007 03:13:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Ioka",
"Kunihito",
""
]
] | We formulate and calculate the second order quasi-normal modes (QNMs) of a Schwarzschild black hole (BH). Gravitational wave (GW) from a distorted BH, so called ringdown, is well understood as QNMs in general relativity. Since QNMs from binary BH mergers will be detected with high signal-to-noise ratio by GW detectors,... |
1809.10935 | Aya Iyonaga | Aya Iyonaga, Kazufumi Takahashi, Tsutomu Kobayashi | Extended Cuscuton: Formulation | 18 pages | JCAP 12 (2018) 002 | 10.1088/1475-7516/2018/12/002 | RUP-18-30 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among single-field scalar-tensor theories, there is a special class called
"cuscuton," which is represented as some limiting case of k-essence in general
relativity. This theory has a remarkable feature that the number of propagating
degrees of freedom is only two in the unitary gauge in contrast to ordinary
scalar-t... | [
{
"created": "Fri, 28 Sep 2018 09:48:51 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2018 08:03:17 GMT",
"version": "v2"
}
] | 2018-12-06 | [
[
"Iyonaga",
"Aya",
""
],
[
"Takahashi",
"Kazufumi",
""
],
[
"Kobayashi",
"Tsutomu",
""
]
] | Among single-field scalar-tensor theories, there is a special class called "cuscuton," which is represented as some limiting case of k-essence in general relativity. This theory has a remarkable feature that the number of propagating degrees of freedom is only two in the unitary gauge in contrast to ordinary scalar-ten... |
gr-qc/9510047 | Luis J. Garay | Carlos Barcelo, Luis J. Garay, Pedro F. Gonzalez-Diaz, Guillermo A.
Mena Marugan | Asymptotically anti-de Sitter wormholes | 10 pages, RevTeX 3.0, LaTeX 2.09 | Phys.Rev. D53 (1996) 3162-3171 | 10.1103/PhysRevD.53.3162 | Imperial/TP/95--96/06 | gr-qc | null | Starting with a procedure for dealing with general asymptotic behaviors, we
construct a quantum theory for asymptotically anti-de Sitter wormholes. We
follow both the path integral formalism and the algebraic quantization program
proposed by Ashtekar. By adding suitable surface terms, the Euclidean action of
the asym... | [
{
"created": "Tue, 24 Oct 1995 15:20:37 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Barcelo",
"Carlos",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Gonzalez-Diaz",
"Pedro F.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | Starting with a procedure for dealing with general asymptotic behaviors, we construct a quantum theory for asymptotically anti-de Sitter wormholes. We follow both the path integral formalism and the algebraic quantization program proposed by Ashtekar. By adding suitable surface terms, the Euclidean action of the asympt... |
1602.04969 | Guillem Dom\`enech | Guillem Dom\`enech and Misao Sasaki | Stationary bubbles: information loss paradox? | Parallel talk given at the 2nd LeCosPA Symposium: Everything about
Gravity | null | 10.1142/9789813203952_0080 | YITP-16-12 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main purpose of this work is to build classically stationary bubbles,
within the thin-shell formalism, which are unstable under quantum effects; they
either collapse into a black hole or expand. Thus, the final state can be
thought of a superposition of geometries. We point out that, from a quantum
mechanical poi... | [
{
"created": "Tue, 16 Feb 2016 10:02:26 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2016 02:03:18 GMT",
"version": "v2"
}
] | 2019-02-27 | [
[
"Domènech",
"Guillem",
""
],
[
"Sasaki",
"Misao",
""
]
] | The main purpose of this work is to build classically stationary bubbles, within the thin-shell formalism, which are unstable under quantum effects; they either collapse into a black hole or expand. Thus, the final state can be thought of a superposition of geometries. We point out that, from a quantum mechanical point... |
2108.01533 | Alexander Zakharov | Alexander F. Zakharov | Constraints on a tidal charge of the supermassive black hole in M87*
with the EHT observations in April 2017 | 8 pages, 1 figure, revised according to the version published in
Universe | Universe vol. 8, issue 3, id. 141 (2022) | 10.3390/universe8030141 | null | gr-qc astro-ph.CO astro-ph.GA | http://creativecommons.org/publicdomain/zero/1.0/ | More than two years ago the Event Horizon Telescope collaboration presented
the first image reconstruction around the shadow for the supermassive black
hole in M87*. It gives an opportunity to evaluate the shadow size. Recently,
the Event Horizon Telescope collaboration constrained parameters ("charges") of
spherical... | [
{
"created": "Tue, 3 Aug 2021 14:32:55 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2022 07:51:59 GMT",
"version": "v2"
}
] | 2022-03-08 | [
[
"Zakharov",
"Alexander F.",
""
]
] | More than two years ago the Event Horizon Telescope collaboration presented the first image reconstruction around the shadow for the supermassive black hole in M87*. It gives an opportunity to evaluate the shadow size. Recently, the Event Horizon Telescope collaboration constrained parameters ("charges") of spherical s... |
2408.03793 | Paolo Massimo Bassani | Paolo M Bassani, Joao Magueijo and Shinji Mukohyama | Violations of energy conservation in Horava-Lifshitz gravity: a new
ingredient in the dark matter puzzle | null | null | null | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We investigate the interplay between Horava-Lifshitz (HL) gravity and more
general theories where the local Hamiltonian constraint is lost, for example
due to the time variability of the Lagrangian (e.g. via its parameters) where
time is defined on a foliation according to a prescription mimicking Lambda and
4-volume... | [
{
"created": "Wed, 7 Aug 2024 14:19:45 GMT",
"version": "v1"
}
] | 2024-08-08 | [
[
"Bassani",
"Paolo M",
""
],
[
"Magueijo",
"Joao",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | We investigate the interplay between Horava-Lifshitz (HL) gravity and more general theories where the local Hamiltonian constraint is lost, for example due to the time variability of the Lagrangian (e.g. via its parameters) where time is defined on a foliation according to a prescription mimicking Lambda and 4-volume t... |
gr-qc/9903027 | Massar Serge | S. Massar and R. Parentani | How the Change in Horizon Area Drives Black Hole Evaporation | 26 pages latex, extensively revised version of gr-qc/9801043.
Definitive version to be published in Nucl. Phys. B | Nucl.Phys. B575 (2000) 333-356 | 10.1016/S0550-3213(00)00067-5 | THU-98/03 and ULB-TH/99-05 | gr-qc hep-th | null | We rephrase the derivation of black hole radiation so as to take into
account, at the level of transition amplitudes, the change of the geometry
induced by the emission process. This enlarged description reveals that the
dynamical variables which govern the emission are the horizon area and its
conjugate time variabl... | [
{
"created": "Mon, 8 Mar 1999 09:26:38 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2000 10:15:28 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Massar",
"S.",
""
],
[
"Parentani",
"R.",
""
]
] | We rephrase the derivation of black hole radiation so as to take into account, at the level of transition amplitudes, the change of the geometry induced by the emission process. This enlarged description reveals that the dynamical variables which govern the emission are the horizon area and its conjugate time variable.... |
1708.05600 | Gr\'egoire Martinon | Gr\'egoire Martinon | The instability of anti-de Sitter space-time | Topical review, 58 pages, 37 figures, 1 table | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review, we retrace the recent progress in the anti-de Sitter (AdS)
instability problem. By instability we mean that for large classes of initial
data, any perturbation of AdS space-time, however small, leads to the formation
of a black hole. Since the seminal work of Bizo\'n and Rostworowski in 2011,
many dif... | [
{
"created": "Fri, 18 Aug 2017 13:29:09 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2017 15:43:04 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Sep 2017 12:39:05 GMT",
"version": "v3"
}
] | 2017-09-19 | [
[
"Martinon",
"Grégoire",
""
]
] | In this review, we retrace the recent progress in the anti-de Sitter (AdS) instability problem. By instability we mean that for large classes of initial data, any perturbation of AdS space-time, however small, leads to the formation of a black hole. Since the seminal work of Bizo\'n and Rostworowski in 2011, many diffe... |
1406.1541 | Sergey Pavluchenko A. | Fabrizio Canfora, Alex Giacomini, and Sergey A. Pavluchenko | Cosmological dynamics of gravitating hadron matter | 20 pages, 5 figures; typos corrected and a comment added in the last
section. Version accepted for publication in Phys. Rev. D | Phys. Rev. D 90, 043516 (2014) | 10.1103/PhysRevD.90.043516 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anisotropic cosmologies are studied in the case where the matter source is
given by the Skyrme model which is an effective description of low energy QCD.
The dynamical evolution of the Kantowski-Sachs and Bianchi-I universes are
analyzed in depth. In both situations in order for solutions to exist and at
the same tim... | [
{
"created": "Thu, 5 Jun 2014 23:01:15 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Aug 2014 12:52:03 GMT",
"version": "v2"
}
] | 2014-08-19 | [
[
"Canfora",
"Fabrizio",
""
],
[
"Giacomini",
"Alex",
""
],
[
"Pavluchenko",
"Sergey A.",
""
]
] | Anisotropic cosmologies are studied in the case where the matter source is given by the Skyrme model which is an effective description of low energy QCD. The dynamical evolution of the Kantowski-Sachs and Bianchi-I universes are analyzed in depth. In both situations in order for solutions to exist and at the same time ... |
1210.8430 | Alexander Zhidenko | R. A. Konoplya, A. Zhidenko | Radiation processes in the vicinity of non-Schwarzschild and non-Kerr
black holes | 12 pages, 5 figures | Phys. Rev. D 87, 024044 (2013) | 10.1103/PhysRevD.87.024044 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Usually alternative theories of gravity imply deviations from the well-known
Kerr space-time, a model of an isolated black hole in General Relativity. In
the dominant order, the deformed Kerr metric, free of closed time-like curves
outside the event horizon, has been suggested recently by Johannsen and
Psaltis. It ha... | [
{
"created": "Wed, 31 Oct 2012 18:33:02 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Nov 2012 15:08:26 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jan 2013 16:15:42 GMT",
"version": "v3"
}
] | 2013-02-06 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | Usually alternative theories of gravity imply deviations from the well-known Kerr space-time, a model of an isolated black hole in General Relativity. In the dominant order, the deformed Kerr metric, free of closed time-like curves outside the event horizon, has been suggested recently by Johannsen and Psaltis. It has ... |
2307.08503 | Faizuddin Ahmed | Faizuddin Ahmed | Geodesics motion of test particles around Schwarzschild-Klinkhamer
wormhole with topological defects and gravitational lensing | 23 pages, 8 figures, published in Journal of Cosmology and
Astroparticle Physics (https://doi.org/10.1088/1475-7516/2023/11/010) | JCAP11(2023)010 | 10.1088/1475-7516/2023/11/010 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | This study investigates the geodesic motion of test particles, both massless
and massive, within a Schwarzschild-Klinkhamer (SK) wormhole space-time. We
specifically consider the influence of cosmic strings on the system and analyze
the effective potential, and observing that the presence of a cosmic string
parameter... | [
{
"created": "Mon, 17 Jul 2023 14:06:00 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 2023 04:26:53 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Nov 2023 15:48:00 GMT",
"version": "v3"
}
] | 2023-11-08 | [
[
"Ahmed",
"Faizuddin",
""
]
] | This study investigates the geodesic motion of test particles, both massless and massive, within a Schwarzschild-Klinkhamer (SK) wormhole space-time. We specifically consider the influence of cosmic strings on the system and analyze the effective potential, and observing that the presence of a cosmic string parameter a... |
gr-qc/0101050 | Dirk Puetzfeld | Dirk Puetzfeld, Romualdo Tresguerres | A cosmological model in Weyl-Cartan spacetime | 19 pages, 5 figures, typos corrected, uses IOP style file | Class.Quant.Grav. 18 (2001) 677-694 | 10.1088/0264-9381/18/4/308 | null | gr-qc | null | We present a cosmological model for early stages of the universe on the basis
of a Weyl-Cartan spacetime. In this model, torsion $T^{\alpha}$ and
nonmetricity $Q_{\alpha \beta}$ are proportional to the vacuum polarization.
Extending earlier work of one of us (RT), we discuss the behavior of the cosmic
scale factor an... | [
{
"created": "Mon, 15 Jan 2001 14:05:43 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Mar 2001 13:12:06 GMT",
"version": "v2"
}
] | 2009-04-03 | [
[
"Puetzfeld",
"Dirk",
""
],
[
"Tresguerres",
"Romualdo",
""
]
] | We present a cosmological model for early stages of the universe on the basis of a Weyl-Cartan spacetime. In this model, torsion $T^{\alpha}$ and nonmetricity $Q_{\alpha \beta}$ are proportional to the vacuum polarization. Extending earlier work of one of us (RT), we discuss the behavior of the cosmic scale factor and ... |
2108.03385 | Gast\'on Creci | Gast\'on Creci, Tanja Hinderer, Jan Steinhoff | Tidal response from scattering and the role of analytic continuation | v5, corrected typos, 29 pages, 2 figures | Phys. Rev. D 104 (12 Dec. 2021), p. 124061 | 10.1103/PhysRevD.104.124061 | null | gr-qc astro-ph.HE astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tidal response of a compact object is a key gravitational-wave observable
encoding information about its interior. This link is subtle due to the
nonlinearities of general relativity. We show that considering a scattering
process bypasses challenges with potential ambiguities, as the tidal response
is determined ... | [
{
"created": "Sat, 7 Aug 2021 07:34:00 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2021 11:30:52 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Dec 2021 16:36:43 GMT",
"version": "v3"
},
{
"created": "Tue, 22 Mar 2022 13:38:58 GMT",
"version": "v4"
},
{
"cr... | 2022-10-26 | [
[
"Creci",
"Gastón",
""
],
[
"Hinderer",
"Tanja",
""
],
[
"Steinhoff",
"Jan",
""
]
] | The tidal response of a compact object is a key gravitational-wave observable encoding information about its interior. This link is subtle due to the nonlinearities of general relativity. We show that considering a scattering process bypasses challenges with potential ambiguities, as the tidal response is determined by... |
0812.0399 | Viqar Husain | Viqar Husain, R. B. Mann | Thermodynamics and phases in quantum gravity | 6 pages, 1 figure; matches published version | Class.Quant.Grav.26:075010,2009 | 10.1088/0264-9381/26/7/075010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an approach for studying quantum gravity effects on black hole
thermodynamics. This combines a quantum framework for gravitational collapse
with quasi-local definitions of energy and surface gravity. Our arguments
suggest that (i) the specific heat of a black hole becomes positive after a
phase transition nea... | [
{
"created": "Tue, 2 Dec 2008 00:38:03 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2009 15:58:04 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Husain",
"Viqar",
""
],
[
"Mann",
"R. B.",
""
]
] | We give an approach for studying quantum gravity effects on black hole thermodynamics. This combines a quantum framework for gravitational collapse with quasi-local definitions of energy and surface gravity. Our arguments suggest that (i) the specific heat of a black hole becomes positive after a phase transition near ... |
0806.4482 | Bindu Anubha Bambah | K. V. S. Shiv Chaitanya and Bindu A Bambah | Squeezed States and Affleck Dine Baryogenesis | 8 pages 9 figures | Phys.Rev.D78:063525,2008 | 10.1103/PhysRevD.78.063525 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum fluctuations in the post inflationary Affleck-Dine baryogenesis model
are studied. The squeezed states formalism is used to give evolution equations
for the particle and anti-particle modes in the early universe. The role of
expansion and parametric amplification of the quantum fluctuations on the
baryon asym... | [
{
"created": "Fri, 27 Jun 2008 10:46:01 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Jun 2008 10:29:50 GMT",
"version": "v2"
}
] | 2009-02-23 | [
[
"Chaitanya",
"K. V. S. Shiv",
""
],
[
"Bambah",
"Bindu A",
""
]
] | Quantum fluctuations in the post inflationary Affleck-Dine baryogenesis model are studied. The squeezed states formalism is used to give evolution equations for the particle and anti-particle modes in the early universe. The role of expansion and parametric amplification of the quantum fluctuations on the baryon asymme... |
1003.1686 | Laur J\"arv | Laur J\"arv, Piret Kuusk and Margus Saal | Potential dominated scalar-tensor cosmologies in the general relativity
limit: phase space view | 15 pages, 12 figures | Phys.Rev.D81:104007,2010 | 10.1103/PhysRevD.81.104007 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the potential dominated era of
Friedmann-Lemaitre-Robertson-Walker flat cosmological models in the framework
of general Jordan frame scalar-tensor theories of gravity with arbitrary
coupling functions, and focus upon the phase space of the scalar field. To
study the regime suggested by the local weak fiel... | [
{
"created": "Mon, 8 Mar 2010 17:56:26 GMT",
"version": "v1"
}
] | 2010-05-25 | [
[
"Järv",
"Laur",
""
],
[
"Kuusk",
"Piret",
""
],
[
"Saal",
"Margus",
""
]
] | We consider the potential dominated era of Friedmann-Lemaitre-Robertson-Walker flat cosmological models in the framework of general Jordan frame scalar-tensor theories of gravity with arbitrary coupling functions, and focus upon the phase space of the scalar field. To study the regime suggested by the local weak field ... |
2006.09209 | Mikhail Katanaev | D. E. Afanasev and M. O. Katanaev | Global properties of warped solutions in General Relativity with an
electromagnetic field and a cosmological constant. II | 32 pages, 18 figures | Phys. Rev. D, 101 (2020) 124025 | 10.1103/PhysRevD.101.124025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider general relativity with cosmological constant minimally coupled
to the electromagnetic field and assume that the four-dimensional space-time
manifold is a warped product of two surfaces with Lorentzian and Euclidean
signature metrics. Field equations imply that at least one of the surfaces must
be of cons... | [
{
"created": "Sun, 14 Jun 2020 18:03:53 GMT",
"version": "v1"
}
] | 2020-06-17 | [
[
"Afanasev",
"D. E.",
""
],
[
"Katanaev",
"M. O.",
""
]
] | We consider general relativity with cosmological constant minimally coupled to the electromagnetic field and assume that the four-dimensional space-time manifold is a warped product of two surfaces with Lorentzian and Euclidean signature metrics. Field equations imply that at least one of the surfaces must be of consta... |
2103.04218 | Fabio Dahia | J. M. Rocha and F. Dahia | Neutron interferometry and tests of short-range modifications of gravity | null | Phys. Rev. D 103, 124014 (2021) | 10.1103/PhysRevD.103.124014 | null | gr-qc nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider tests of short-distance modifications of gravity based on neutron
interferometry in the scenario of large extra dimensions. Avoiding the
non-computability problem in the calculation of the internal gravitational
potential of extended sources, typical of models with zero-width brane, we
determine the neutr... | [
{
"created": "Sun, 7 Mar 2021 00:29:41 GMT",
"version": "v1"
}
] | 2021-06-16 | [
[
"Rocha",
"J. M.",
""
],
[
"Dahia",
"F.",
""
]
] | We consider tests of short-distance modifications of gravity based on neutron interferometry in the scenario of large extra dimensions. Avoiding the non-computability problem in the calculation of the internal gravitational potential of extended sources, typical of models with zero-width brane, we determine the neutron... |
1806.09433 | Eduardo Bittencourt | Eduardo Bittencourt, Vanessa P Freitas, Jos\'e M Salim, Grasiele B
Santos | Radiating Spherical Collapse for an Inhomogeneous Interior Solution | 17 pages, 5 figures | null | 10.1007/s10714-019-2511-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the problem of gravitational collapse considering the matching of
an exterior region described by the Vaidya's metric and an interior region
described by a spherically symmetric shear-free inhomogeneous geometry sourced
by a viscous fluid. We establish initial and final conditions for the process
in order ... | [
{
"created": "Mon, 25 Jun 2018 13:10:01 GMT",
"version": "v1"
}
] | 2019-02-13 | [
[
"Bittencourt",
"Eduardo",
""
],
[
"Freitas",
"Vanessa P",
""
],
[
"Salim",
"José M",
""
],
[
"Santos",
"Grasiele B",
""
]
] | We analyze the problem of gravitational collapse considering the matching of an exterior region described by the Vaidya's metric and an interior region described by a spherically symmetric shear-free inhomogeneous geometry sourced by a viscous fluid. We establish initial and final conditions for the process in order th... |
1409.3751 | Aleksandar Mikovic | Aleksandar Mikovic and Miguel A. Oliveira | Canonical formulation of Poincare BFCG theory and its quantization | 17 pages, errors corrected and new references added | null | 10.1007/s10714-015-1900-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find the canonical formulation of the Poincare BFCG theory in terms of the
spatial 2-connection and its canonically conjugate momenta. We show that the
Poincare BFCG action is dynamically equivalent to the BF action for the
Poincare group and we find the canonical transformation relating the two. We
study the cano... | [
{
"created": "Fri, 12 Sep 2014 14:33:12 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Mar 2015 07:17:20 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Mikovic",
"Aleksandar",
""
],
[
"Oliveira",
"Miguel A.",
""
]
] | We find the canonical formulation of the Poincare BFCG theory in terms of the spatial 2-connection and its canonically conjugate momenta. We show that the Poincare BFCG action is dynamically equivalent to the BF action for the Poincare group and we find the canonical transformation relating the two. We study the canoni... |
1804.02821 | Suddhasattwa Brahma | Suddhasattwa Brahma and Dong-han Yeom | Effective black-to-white hole bounces: The cost of surgery | 18 pages, 8 figures | Class.Quant.Grav. 35 (2018) no.20, 205007 | 10.1088/1361-6382/aae1df | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate possible geometries allowing transitions from a black hole to
a white hole spacetime, by placing a space-like thin shell between them. Such
proposals have been advanced recently to account for singularity-resolution in
black-hole spacetimes. This space-like shell can be extended to be outside the
event... | [
{
"created": "Mon, 9 Apr 2018 05:47:07 GMT",
"version": "v1"
}
] | 2018-10-18 | [
[
"Brahma",
"Suddhasattwa",
""
],
[
"Yeom",
"Dong-han",
""
]
] | We investigate possible geometries allowing transitions from a black hole to a white hole spacetime, by placing a space-like thin shell between them. Such proposals have been advanced recently to account for singularity-resolution in black-hole spacetimes. This space-like shell can be extended to be outside the event h... |
gr-qc/9507031 | Dadhich | L.K. Patel, N. Dadhich and A. Beesham | String-Dust Distributions with the Kerr-NUT symmetry | 15 pages, TeX version. tex error corrected | null | null | IUCAA-17/95 | gr-qc | null | We attempt to solve the Einstein equations for string dust and null flowing
radiation for the general axially symmetric metric, which we believe is being
done for the first time. We obtain the string-dust and radiating
generalizations of the Kerr and the NUT solutions. There also occurs an
interesting case of radiati... | [
{
"created": "Fri, 14 Jul 1995 14:45:07 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 1995 16:24:15 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jul 1995 11:50:30 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Patel",
"L. K.",
""
],
[
"Dadhich",
"N.",
""
],
[
"Beesham",
"A.",
""
]
] | We attempt to solve the Einstein equations for string dust and null flowing radiation for the general axially symmetric metric, which we believe is being done for the first time. We obtain the string-dust and radiating generalizations of the Kerr and the NUT solutions. There also occurs an interesting case of radiating... |
1909.12873 | Damiano Anselmi | Damiano Anselmi and Antonio Marino | Fakeons and microcausality: light cones, gravitational waves and the
Hubble constant | 24 pages; CQG | Class. Quantum Grav. 37 (2020) 095003 | 10.1088/1361-6382/ab78d2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of fake particle, or "fakeon", allows us to make sense of quantum
gravity as an ultraviolet complete theory, by renouncing causality at very
small distances. We investigate whether the violation of microcausality can be
amplified or detected in the most common settings. We show that it is actually
short r... | [
{
"created": "Fri, 27 Sep 2019 18:56:06 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Mar 2020 22:37:03 GMT",
"version": "v2"
}
] | 2020-04-08 | [
[
"Anselmi",
"Damiano",
""
],
[
"Marino",
"Antonio",
""
]
] | The concept of fake particle, or "fakeon", allows us to make sense of quantum gravity as an ultraviolet complete theory, by renouncing causality at very small distances. We investigate whether the violation of microcausality can be amplified or detected in the most common settings. We show that it is actually short ran... |
1404.3787 | Sang Pyo Kim | Sang Pyo Kim (Kunsan Natl. Univ.) | Geometric Origin of Pair Production by Electric Field in de Sitter Space | LaTex 4 pages, Invited talk at ICGAC11, Almaty, Kazakhstan, October
1-5, 2013 | null | 10.1134/S0202289314030104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The particle production in a de Sitter space provides an interesting model to
understand the curvature effect on Schwinger pair production by a constant
electric field or Schwinger mechanism on the de Sitter radiation. For that
purpose, we employ the recently introduced complex analysis method, in which
the quantum e... | [
{
"created": "Tue, 15 Apr 2014 00:43:22 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Kim",
"Sang Pyo",
"",
"Kunsan Natl. Univ."
]
] | The particle production in a de Sitter space provides an interesting model to understand the curvature effect on Schwinger pair production by a constant electric field or Schwinger mechanism on the de Sitter radiation. For that purpose, we employ the recently introduced complex analysis method, in which the quantum evo... |
2010.02754 | Saeed Ullah Khan | Saeed Ullah Khan and Jingli Ren | Particle dynamics around a dyonic charged black hole | 15 pages, 7 figures | Chinese Journal of Physics 2020 | 10.1016/j.cjph.2020.08.027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the circular motion of particles and the well-known
Penrose mechanism around a Kerr-Newman-Kasuya black hole spacetime. The inner
and outer horizons, as well as ergosurfaces of the said black hole, are briefly
examined under the effect of spin and dyonic charge. Moreover, by limiting our
exp... | [
{
"created": "Sun, 4 Oct 2020 09:52:21 GMT",
"version": "v1"
}
] | 2020-10-07 | [
[
"Khan",
"Saeed Ullah",
""
],
[
"Ren",
"Jingli",
""
]
] | In this article, we study the circular motion of particles and the well-known Penrose mechanism around a Kerr-Newman-Kasuya black hole spacetime. The inner and outer horizons, as well as ergosurfaces of the said black hole, are briefly examined under the effect of spin and dyonic charge. Moreover, by limiting our explo... |
1811.09844 | William Barker Mr | William E V Barker, Anthony N Lasenby, Michael P Hobson, William J
Handley | Static energetics in gravity | Replaced with published version. 19 pages, 2 figures | null | 10.1063/1.5082730 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A stress-energy tensor for linear gravity adapted to the harmonic gauge was
recently proposed by Butcher, Hobson and Lasenby. By removing gauge constraints
and imposing full metrical GR, we find a natural generalisation to the
pseudotensor of Einstein. M{\o}ller's pseudotensor is an alternative to that of
Einstein fo... | [
{
"created": "Sat, 24 Nov 2018 14:27:11 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2020 16:57:22 GMT",
"version": "v2"
}
] | 2020-03-06 | [
[
"Barker",
"William E V",
""
],
[
"Lasenby",
"Anthony N",
""
],
[
"Hobson",
"Michael P",
""
],
[
"Handley",
"William J",
""
]
] | A stress-energy tensor for linear gravity adapted to the harmonic gauge was recently proposed by Butcher, Hobson and Lasenby. By removing gauge constraints and imposing full metrical GR, we find a natural generalisation to the pseudotensor of Einstein. M{\o}ller's pseudotensor is an alternative to that of Einstein form... |
1807.04671 | Sergey Paston | R.V. Ilin, S.A. Paston | Exact relation between canonical and metric energy-momentum tensors for
higher derivative tensor field theories | LaTeX, 11 pages | European Physical Journal Plus (2019) 134: 21 | 10.1140/epjp/i2019-12359-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the relation between canonical and metric energy-momentum tensors
for field theories with actions that can depend on the higher derivatives of
tensor fields in a flat spacetime. In order to obtain it we use a modification
of the Noether's procedure for curved space-time. For considered case the
difference ... | [
{
"created": "Thu, 12 Jul 2018 15:25:32 GMT",
"version": "v1"
}
] | 2019-01-14 | [
[
"Ilin",
"R. V.",
""
],
[
"Paston",
"S. A.",
""
]
] | We discuss the relation between canonical and metric energy-momentum tensors for field theories with actions that can depend on the higher derivatives of tensor fields in a flat spacetime. In order to obtain it we use a modification of the Noether's procedure for curved space-time. For considered case the difference be... |
gr-qc/9912047 | Jorge L. Cervantes-Cota | Jorge L. Cervantes Cota | Bianchi V inflation in the Brans-Dicke theory? | 28 pages, 6 figuras | Class.Quant.Grav.16:3903-3922,1999 | 10.1088/0264-9381/16/12/309 | null | gr-qc | null | It is shown some exact solutions in the Brans-Dicke (BD) theory for a Bianchi
V metric having the property of inflationary expansion, graceful exit, and
asymptotic evolution to a Friedmann-Robertson-Walker (FRW) open model. It is
remarkable that an inflationary behaviour can occur, even without a
cosmological potenti... | [
{
"created": "Fri, 10 Dec 1999 22:40:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cota",
"Jorge L. Cervantes",
""
]
] | It is shown some exact solutions in the Brans-Dicke (BD) theory for a Bianchi V metric having the property of inflationary expansion, graceful exit, and asymptotic evolution to a Friedmann-Robertson-Walker (FRW) open model. It is remarkable that an inflationary behaviour can occur, even without a cosmological potential... |
2002.00834 | Klaus Liegener Dr | Andrea Dapor, Klaus Liegener | Modifications to Gravitational Wave Equation from Canonical Quantum
Gravity | 9 pages, 3 figures | EPJC 80, no. 741 (2020) | 10.1140/epjc/s10052-020-8333-8 | null | gr-qc astro-ph.CO hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is expected that the quantum nature of spacetime leaves its imprint in all
semiclassical gravitational systems, at least in certain regimes, including
gravitational waves. In this paper we investigate such imprints on
gravitational waves within a specific framework: space is assumed to be
discrete (in the form of ... | [
{
"created": "Mon, 3 Feb 2020 15:47:01 GMT",
"version": "v1"
}
] | 2021-11-01 | [
[
"Dapor",
"Andrea",
""
],
[
"Liegener",
"Klaus",
""
]
] | It is expected that the quantum nature of spacetime leaves its imprint in all semiclassical gravitational systems, at least in certain regimes, including gravitational waves. In this paper we investigate such imprints on gravitational waves within a specific framework: space is assumed to be discrete (in the form of a ... |
2311.13715 | Eric Ling | Eric Ling and Argam Ohanyan | Examples of cosmological spacetimes without CMC Cauchy surfaces | 25 pages, 2 figures; final version agrees with published version | null | 10.1007/s11005-024-01843-7 | CPH-GEOTOP-DNRF151; CF21-0680 | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | CMC (constant mean curvature) Cauchy surfaces play an important role in
mathematical relativity as finding solutions to the vacuum Einstein constraint
equations is made much simpler by assuming CMC initial data. However, in [2]
Bartnik constructed a cosmological spacetime without a CMC Cauchy surface whose
spatial to... | [
{
"created": "Wed, 22 Nov 2023 22:19:44 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2024 11:13:53 GMT",
"version": "v2"
}
] | 2024-08-01 | [
[
"Ling",
"Eric",
""
],
[
"Ohanyan",
"Argam",
""
]
] | CMC (constant mean curvature) Cauchy surfaces play an important role in mathematical relativity as finding solutions to the vacuum Einstein constraint equations is made much simpler by assuming CMC initial data. However, in [2] Bartnik constructed a cosmological spacetime without a CMC Cauchy surface whose spatial topo... |
2002.08160 | Ksh Newton Singh | Ksh. Newton Singh, Abdelghani Errehymy, Farook Rahaman and Mohammed
Daoud | Exploring physical properties of compact stars in $f(R,T)-$gravity: An
embedding approach | 26 Pages, 14 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solving field equations exactly in $f(R,T)$ gravity is one of the difficult
task. To do so, many authors have adopted different methods such as assuming
both the metric functions, an equation of state (EoS) and a metric function
etc. However, such methods may not always lead to well-behaved solutions and
thereby reje... | [
{
"created": "Sat, 15 Feb 2020 16:04:03 GMT",
"version": "v1"
}
] | 2020-02-20 | [
[
"Singh",
"Ksh. Newton",
""
],
[
"Errehymy",
"Abdelghani",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Daoud",
"Mohammed",
""
]
] | Solving field equations exactly in $f(R,T)$ gravity is one of the difficult task. To do so, many authors have adopted different methods such as assuming both the metric functions, an equation of state (EoS) and a metric function etc. However, such methods may not always lead to well-behaved solutions and thereby reject... |
gr-qc/0612053 | Yury F. Pirogov | Yu. F. Pirogov | Minimal metagravity vs. dark matter and/or dark energy | 6 pages, a typo corrected | Phys.Atom.Nucl.70:2148-2151,2007; Phys.Atom.Nucl.71:1650,2008 | 10.1134/S1063778807120162 10.1134/S1063778808090226 | null | gr-qc astro-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The minimal metagravity theory, explicitly violating the general covariance
but preserving the unimodular one, is applied to study the evolution of the
isotropic homogeneous Universe. The massive scalar graviton, contained in the
theory in addition to the massless tensor one, is treated as a source of the
dark matter... | [
{
"created": "Fri, 8 Dec 2006 17:16:37 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Dec 2006 13:04:55 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Apr 2007 14:00:55 GMT",
"version": "v3"
},
{
"created": "Thu, 5 Jun 2008 18:06:09 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Pirogov",
"Yu. F.",
""
]
] | The minimal metagravity theory, explicitly violating the general covariance but preserving the unimodular one, is applied to study the evolution of the isotropic homogeneous Universe. The massive scalar graviton, contained in the theory in addition to the massless tensor one, is treated as a source of the dark matter a... |
0802.4047 | T. Damour | Thibault Damour | Introductory lectures on the Effective One Body formalism | 22 pages, 3 figures, lectures given at the Second ICRANet
Stueckelberg Workshop on Relativistic Field Theories (Pescara, Italy,
September 3-8, 2007); to be published in the International Journal of Modern
Physics A | Int.J.Mod.Phys.A23:1130-1148,2008 | 10.1142/S0217751X08039992 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Effective One Body (EOB) formalism is an analytical approach which aims
at providing an accurate description of the motion and radiation of coalescing
binary black holes. We present a brief review of the basic elements of this
approach.
| [
{
"created": "Wed, 27 Feb 2008 17:04:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Damour",
"Thibault",
""
]
] | The Effective One Body (EOB) formalism is an analytical approach which aims at providing an accurate description of the motion and radiation of coalescing binary black holes. We present a brief review of the basic elements of this approach. |
2108.00161 | Jay Solanki | Jay Solanki and Bhashin Thakore | A New Class of Analytical Solutions Describing Anisotropic Neutron Stars
in General Relativity | null | Int. J. Mod. Phys. D, vol. 30, no. 12, p. 2150091, 2021 | 10.1142/S0218271821500917 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A new class of solutions describing analytical solutions for compact stellar
structures has been developed within the tenets of General Relativity.
Considering the inherent anisotropy in compact stars, a stable and causal model
for realistic anisotropic neutron stars was obtained using the general theory
of relativit... | [
{
"created": "Sat, 31 Jul 2021 06:33:19 GMT",
"version": "v1"
}
] | 2021-10-14 | [
[
"Solanki",
"Jay",
""
],
[
"Thakore",
"Bhashin",
""
]
] | A new class of solutions describing analytical solutions for compact stellar structures has been developed within the tenets of General Relativity. Considering the inherent anisotropy in compact stars, a stable and causal model for realistic anisotropic neutron stars was obtained using the general theory of relativity.... |
gr-qc/0202057 | Joel Smoller | Joel A. Smoller | The Interaction of Gravity with Other Fields | 25 pages, LaTeX | null | null | null | gr-qc | null | We consider the interaction of gravity, as expressed by Einstein's Equations
of General Relativity, to other force fields. We describe some recent results,
discussing both the mathematics, and the physical interpretations. These
results concern both elementary particles, as well as cosmological models.
(This paper de... | [
{
"created": "Fri, 15 Feb 2002 20:07:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Smoller",
"Joel A.",
""
]
] | We consider the interaction of gravity, as expressed by Einstein's Equations of General Relativity, to other force fields. We describe some recent results, discussing both the mathematics, and the physical interpretations. These results concern both elementary particles, as well as cosmological models. (This paper desc... |
0903.0083 | Ilya Kirnos Vasilyevich | Ilya V. Kirnos, Andrew N. Makarenko | Accelerating cosmologies in Lovelock gravity with dilaton | 23 pages | null | 10.2174/1874381101003010037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the description of the Universe expansion, compatible with observational
data, a model of modified gravity - Lovelock gravity with dilaton - is
investigated. D-dimensional space with 3- and (D-4)-dimensional maximally
symmetric subspaces is considered. Space without matter and space with perfect
fluid are under t... | [
{
"created": "Sat, 28 Feb 2009 15:48:11 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Kirnos",
"Ilya V.",
""
],
[
"Makarenko",
"Andrew N.",
""
]
] | For the description of the Universe expansion, compatible with observational data, a model of modified gravity - Lovelock gravity with dilaton - is investigated. D-dimensional space with 3- and (D-4)-dimensional maximally symmetric subspaces is considered. Space without matter and space with perfect fluid are under tes... |
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