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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9709046 | Andrzej Krolak | John K. Beem and Andrzej Krolak | Cauchy Horizon Endpoints and Differentiability | 16 pages, Latex | null | 10.1063/1.532610 | null | gr-qc | null | Cauchy horizons are shown to be differentiable at endpoints where only a
single null generator leaves the horizon. A Cauchy horizon fails to have any
null generator endpoints on a given open subset iff it is differentiable on the
open subset and also iff the horizon is (at least) of class C^1 on the open
subset. Give... | [
{
"created": "Thu, 18 Sep 1997 08:55:54 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Beem",
"John K.",
""
],
[
"Krolak",
"Andrzej",
""
]
] | Cauchy horizons are shown to be differentiable at endpoints where only a single null generator leaves the horizon. A Cauchy horizon fails to have any null generator endpoints on a given open subset iff it is differentiable on the open subset and also iff the horizon is (at least) of class C^1 on the open subset. Given ... |
1308.6747 | Muhammad Sharif | M. Sharif and Rabia Saleem | Statefinder Diagnostic for Dark Energy Models in Bianchi I Universe | 24 pages, 19 figures | Int. J. Mod. Phys. D 21(2012)1250046 | 10.1142/S0218271812500460 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the statefinder, the deceleration and equation
of state parameters when universe is composed of generalized holographic dark
energy or generalized Ricci dark energy for Bianchi I universe model. These
parameters are found for both interacting as well as non-interacting scenarios
of gener... | [
{
"created": "Thu, 29 Aug 2013 02:48:23 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Sharif",
"M.",
""
],
[
"Saleem",
"Rabia",
""
]
] | In this paper, we investigate the statefinder, the deceleration and equation of state parameters when universe is composed of generalized holographic dark energy or generalized Ricci dark energy for Bianchi I universe model. These parameters are found for both interacting as well as non-interacting scenarios of general... |
gr-qc/0410146 | Tomasz Pawlowski | Jerzy Lewandowski, Tomasz Pawlowski | Quasi-local rotating black holes in higher dimension: geometry | 32 pages, RevTex4 | Class.Quant.Grav. 22 (2005) 1573-1598 | 10.1088/0264-9381/22/9/007 | null | gr-qc hep-th | null | With a help of a generalized Raychaudhuri equation non-expanding null
surfaces are studied in arbitrarily dimensional case. The definition and basic
properties of non-expanding and isolated horizons known in the literature in
the 4 and 3 dimensional cases are generalized. A local description of horizon's
geometry is ... | [
{
"created": "Thu, 28 Oct 2004 21:13:15 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | With a help of a generalized Raychaudhuri equation non-expanding null surfaces are studied in arbitrarily dimensional case. The definition and basic properties of non-expanding and isolated horizons known in the literature in the 4 and 3 dimensional cases are generalized. A local description of horizon's geometry is pr... |
0804.0572 | Irene Milillo | Irene Milillo, Massimiliano Lattanzi, Giovanni Montani | On the coupling between spinning particles and cosmological
gravitational waves | 4 pages, to appear in Proceedings of the II Stueckelberg Workshop -
Int. J. Mod. Phys. A | Int.J.Mod.Phys.A23:1278-1281,2008 | 10.1142/S0217751X08040226 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The influence of spin in a system of classical particles on the propagation
of gravitational waves is analyzed in the cosmological context of primordial
thermal equilibrium. On a flat Friedmann-Robertson-Walker metric, when the
precession is neglected, there is no contribution due to the spin to the
distribution func... | [
{
"created": "Thu, 3 Apr 2008 17:12:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Milillo",
"Irene",
""
],
[
"Lattanzi",
"Massimiliano",
""
],
[
"Montani",
"Giovanni",
""
]
] | The influence of spin in a system of classical particles on the propagation of gravitational waves is analyzed in the cosmological context of primordial thermal equilibrium. On a flat Friedmann-Robertson-Walker metric, when the precession is neglected, there is no contribution due to the spin to the distribution functi... |
gr-qc/0601044 | David Mattingly | David Mattingly | On horizon constraints and Hawking radiation | null | null | null | null | gr-qc | null | Questions about black holes in quantum gravity generally presuppose the
presence of a horizon. Recently Carlip has shown that enforcing an initial data
surface to be a horizon leads to the correct form for the Bekenstein-Hawking
entropy of the black hole. Requiring a horizon also constitutes fixed
background geometry... | [
{
"created": "Wed, 11 Jan 2006 20:48:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mattingly",
"David",
""
]
] | Questions about black holes in quantum gravity generally presuppose the presence of a horizon. Recently Carlip has shown that enforcing an initial data surface to be a horizon leads to the correct form for the Bekenstein-Hawking entropy of the black hole. Requiring a horizon also constitutes fixed background geometry, ... |
gr-qc/0209101 | Shane L. Larson | Curt Cutler (AEI), William A. Hiscock (Montana State) and Shane L.
Larson (Caltech) | LISA, binary stars, and the mass of the graviton | ReVTeX 4, 6 pages, 1 figure, submitted to Phys Rev D | Phys.Rev. D67 (2003) 024015 | 10.1103/PhysRevD.67.024015 | null | gr-qc astro-ph | null | We extend and improve earlier estimates of the ability of the proposed LISA
(Laser Interferometer Space Antenna) gravitational wave detector to place upper
bounds on the graviton mass, m_g, by comparing the arrival times of
gravitational and electromagnetic signals from binary star systems. We show
that the best poss... | [
{
"created": "Thu, 26 Sep 2002 17:30:13 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Cutler",
"Curt",
"",
"AEI"
],
[
"Hiscock",
"William A.",
"",
"Montana State"
],
[
"Larson",
"Shane L.",
"",
"Caltech"
]
] | We extend and improve earlier estimates of the ability of the proposed LISA (Laser Interferometer Space Antenna) gravitational wave detector to place upper bounds on the graviton mass, m_g, by comparing the arrival times of gravitational and electromagnetic signals from binary star systems. We show that the best possib... |
2302.07999 | Alberto Escalante | Alberto Escalante (Puebla U., Inst. Fis.), P. Fernando Oca\~na
Garc\'ia (Puebla U., Inst. Fis.) | Hamiltonian analysis for new massive gravity | null | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | A detailed canonical analysis for three-dimensional massive gravity is
performed. The construction of the fundamental Dirac brackets, the complete
structure of the constraints and the counting of the physical degrees of
freedom are reported. In addition, it is shown that the extended Hamiltonian is
healed from Orstro... | [
{
"created": "Thu, 16 Feb 2023 00:15:54 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2023 01:31:01 GMT",
"version": "v2"
}
] | 2023-05-10 | [
[
"Escalante",
"Alberto",
"",
"Puebla U., Inst. Fis."
],
[
"García",
"P. Fernando Ocaña",
"",
"Puebla U., Inst. Fis."
]
] | A detailed canonical analysis for three-dimensional massive gravity is performed. The construction of the fundamental Dirac brackets, the complete structure of the constraints and the counting of the physical degrees of freedom are reported. In addition, it is shown that the extended Hamiltonian is healed from Orstrogr... |
2010.13628 | Rajendra Gupta | Rajendra P. Gupta | Varying physical constants and the lithium problem | 8 pages, 2 figures, thoroughly revised as published with typos
corrected. Critical comments welcomed | Astroparticle Physics (2021) 129, 102578 | 10.1016/j.astropartphys.2021.102578 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have used the recently published varying physical constants (VPC) approach
to resolve the primordial lithium abundance problem. The value of the ratio of
$7Li$ to hydrogen $7Li/H=1.400(\pm 0.023){\times}10^{-10}$ we have calculated
using this approach is about four times lower than that estimated using the
standar... | [
{
"created": "Fri, 23 Oct 2020 16:13:47 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2021 16:53:35 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Mar 2022 01:15:39 GMT",
"version": "v3"
}
] | 2022-03-25 | [
[
"Gupta",
"Rajendra P.",
""
]
] | We have used the recently published varying physical constants (VPC) approach to resolve the primordial lithium abundance problem. The value of the ratio of $7Li$ to hydrogen $7Li/H=1.400(\pm 0.023){\times}10^{-10}$ we have calculated using this approach is about four times lower than that estimated using the standard ... |
2303.18111 | Kristina Giesel | Kristina Giesel and Hongguang Liu | Dynamically implementing the $\overline{\mu}$-scheme in cosmological and
spherically symmetric models in an extended phase space model | 16 pages + appendix, accepted by universe, contribution to the
special issue "Loop Quantum Gravity: A Themed Issue in Honor of Prof. Abhay
Ashtekar" | Universe 2023, 9(4), 176 | 10.3390/universe9040176 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an extended phase space formulation for cosmological and
spherically symmetric models in which the choice of a given
$\overline{\mu}$-scheme can be implemented dynamically. These models are
constructed in the context of the relational formalism by using a canonical
transformation on the extended phase spa... | [
{
"created": "Fri, 31 Mar 2023 14:58:55 GMT",
"version": "v1"
}
] | 2023-04-04 | [
[
"Giesel",
"Kristina",
""
],
[
"Liu",
"Hongguang",
""
]
] | We consider an extended phase space formulation for cosmological and spherically symmetric models in which the choice of a given $\overline{\mu}$-scheme can be implemented dynamically. These models are constructed in the context of the relational formalism by using a canonical transformation on the extended phase space... |
1504.03062 | Kiyoshi Shiraishi | Takuya Maki and Kiyoshi Shiraishi | Exact solutions for gravitational collapse with a dilaton field in
arbitrary dimensions | 15 pages, 2 eps figures | Classical and Quantum Gravity 12, No. 1, pp. 159-172 (1995) | 10.1088/0264-9381/12/1/014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present time-dependent analytic solutions to the Einstein equations
coupled with a dilaton (scalar) field. The background geometry for the
solutions is a product of an N-dimensional spherically symmetric space and a
d-dimensional flat space. We discuss the global properties of the spacetime.
| [
{
"created": "Mon, 13 Apr 2015 04:36:44 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Apr 2019 02:49:23 GMT",
"version": "v2"
}
] | 2019-04-09 | [
[
"Maki",
"Takuya",
""
],
[
"Shiraishi",
"Kiyoshi",
""
]
] | We present time-dependent analytic solutions to the Einstein equations coupled with a dilaton (scalar) field. The background geometry for the solutions is a product of an N-dimensional spherically symmetric space and a d-dimensional flat space. We discuss the global properties of the spacetime. |
2102.06734 | Rita Teixeira da Costa | Rita Teixeira da Costa, Marc Casals | The Teukolsky--Starobinsky constants: facts and fictions | 17 pages, 4 figures | Classical and Quantum Gravity, 38:165016 (2020) | 10.1088/1361-6382/ac11a8 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Teukolsky Master Equation describes the dynamics of massless fields with
spin on a Kerr black hole. Under separation of variables, spin-reversal for
this equation is accomplished through the so-called Teukolsky--Starobinsky
identities. These identities are associated to the so-called
Teukolsky--Starobinsky consta... | [
{
"created": "Fri, 12 Feb 2021 19:33:41 GMT",
"version": "v1"
}
] | 2021-08-20 | [
[
"da Costa",
"Rita Teixeira",
""
],
[
"Casals",
"Marc",
""
]
] | The Teukolsky Master Equation describes the dynamics of massless fields with spin on a Kerr black hole. Under separation of variables, spin-reversal for this equation is accomplished through the so-called Teukolsky--Starobinsky identities. These identities are associated to the so-called Teukolsky--Starobinsky constant... |
gr-qc/9310029 | null | J\"urgen Audretsch and Karl-Peter Marzlin | Ramsey fringes in atomic interferometry: measurability of the influence
of space-time curvature | 28 pages, Preprint KONS-RGKU-94/02, RevTeX 2.1 The description of the
proposed experiment has been substantially changed. Instead of the space-time
curvature of the earth we now consider the curvature caused by two
laboratory-sized lead blocks. (Pictures are not changed) | Phys.Rev. A50 (1994) 2080 | 10.1103/PhysRevA.50.2080 | null | gr-qc | null | The influence od space-time curvature on quantum matter which can be
theoretically described by covariant wave equations has not been experimentally
established yet. In this paper we analyse in detail the suitability of the
Ramsey atom beam interferometer for the measurement of the phase shift caused
by the Riemannia... | [
{
"created": "Thu, 21 Oct 1993 14:52:37 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 1994 13:07:17 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Audretsch",
"Jürgen",
""
],
[
"Marzlin",
"Karl-Peter",
""
]
] | The influence od space-time curvature on quantum matter which can be theoretically described by covariant wave equations has not been experimentally established yet. In this paper we analyse in detail the suitability of the Ramsey atom beam interferometer for the measurement of the phase shift caused by the Riemannian ... |
2210.05998 | Jorge Gigante Valcarcel | Sebastian Bahamonde, Johann Chevrier, Jorge Gigante Valcarcel | New black hole solutions with a dynamical traceless nonmetricity tensor
in Metric-Affine Gravity | 21 pages, 0 figures, minor changes, references added. It matches the
version published in JCAP | JCAP02(2023)018 | 10.1088/1475-7516/2023/02/018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of Metric-Affine Gravity, the existing correspondence
between the Einstein tensor and the energy-momentum tensor of matter provided
by General Relativity is extended towards a post-Riemannian description in
terms of the torsion and nonmetricity fields, which are sourced by the spin,
dilation and shea... | [
{
"created": "Wed, 12 Oct 2022 08:07:01 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2023 08:04:58 GMT",
"version": "v2"
}
] | 2023-02-10 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Chevrier",
"Johann",
""
],
[
"Valcarcel",
"Jorge Gigante",
""
]
] | In the framework of Metric-Affine Gravity, the existing correspondence between the Einstein tensor and the energy-momentum tensor of matter provided by General Relativity is extended towards a post-Riemannian description in terms of the torsion and nonmetricity fields, which are sourced by the spin, dilation and shear ... |
2308.05544 | Yi Yang | Yi Yang, Dong Liu, Ali \"Ovg\"un, Gaetano Lambiase, and Zheng-Wen Long | Black hole surrounded by the pseudo-isothermal dark matter halo | null | Eur. Phys. J. C (2024) 84:63 | 10.1140/epjc/s10052-024-12412-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The abundance of dark matter in the actual universe motivates us to construct
the black hole spacetime enveloped by dark matter. In this paper, we derive a
new spherically symmetric black hole surrounded by the pseudo-isothermal dark
matter halo, and then explore the effects of the pseudo-isothermal halo profile
on a... | [
{
"created": "Thu, 10 Aug 2023 12:53:47 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2023 13:52:43 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jan 2024 15:45:12 GMT",
"version": "v3"
}
] | 2024-01-29 | [
[
"Yang",
"Yi",
""
],
[
"Liu",
"Dong",
""
],
[
"Övgün",
"Ali",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Long",
"Zheng-Wen",
""
]
] | The abundance of dark matter in the actual universe motivates us to construct the black hole spacetime enveloped by dark matter. In this paper, we derive a new spherically symmetric black hole surrounded by the pseudo-isothermal dark matter halo, and then explore the effects of the pseudo-isothermal halo profile on a r... |
gr-qc/9806082 | Fernando Kokubun | F. Kokubun | Gravitational Waves from The Newtonian plus H\'enon-Heiles System | 10 pages, RevTex, three PS figures, to be published in Phys.Lett. A | Phys.Lett. A245 (1998) 358-362 | 10.1016/S0375-9601(98)00470-8 | null | gr-qc | null | In this work we analyze the emission of gravitational waves from a
gravitational system described by a Newtonian term plus a H\'enon-Heiles term.
The main concern is to analyze how the inclusion of the Newtonian term changes
the emission of gravitational waves, considering its emission in the chaotic
and regular regi... | [
{
"created": "Fri, 19 Jun 1998 23:48:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kokubun",
"F.",
""
]
] | In this work we analyze the emission of gravitational waves from a gravitational system described by a Newtonian term plus a H\'enon-Heiles term. The main concern is to analyze how the inclusion of the Newtonian term changes the emission of gravitational waves, considering its emission in the chaotic and regular regime... |
2210.14968 | Dirk Puetzfeld | Peter A. Hogan, Dirk Puetzfeld | Colliding Plane Fronted Waves and a Gravito--Electromagnetic Searchlight | 7 pages, 2 figures | Phys. Rev. D 106, 124043 (2022) | 10.1103/PhysRevD.106.124043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a formulation of Einstein--Maxwell vacuum fields due to plane
fronted electromagnetic waves sharing their wave fronts with gravitational
waves. This is based on a recent geometrical reconstruction of plane fronted
wave fields by the authors which clearly identifies the cases in which the wave
fronts collid... | [
{
"created": "Wed, 26 Oct 2022 18:24:26 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2022 15:54:13 GMT",
"version": "v2"
}
] | 2023-01-02 | [
[
"Hogan",
"Peter A.",
""
],
[
"Puetzfeld",
"Dirk",
""
]
] | We present a formulation of Einstein--Maxwell vacuum fields due to plane fronted electromagnetic waves sharing their wave fronts with gravitational waves. This is based on a recent geometrical reconstruction of plane fronted wave fields by the authors which clearly identifies the cases in which the wave fronts collide ... |
1108.0829 | Tomasz Pawlowski | Guillermo A. Mena Marugan, Javier Olmedo, Tomasz Pawlowski | Prescriptions in Loop Quantum Cosmology: A comparative analysis | 18 pages, 6 figures, RevTex4-1 + BibTex | null | 10.1103/PhysRevD.84.064012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various prescriptions proposed in the literature to attain the polymeric
quantization of a homogeneous and isotropic flat spacetime coupled to a
massless scalar field are carefully analyzed in order to discuss their
differences. A detailed numerical analysis confirms that, for states which are
not deep in the quantum... | [
{
"created": "Wed, 3 Aug 2011 12:34:36 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Marugan",
"Guillermo A. Mena",
""
],
[
"Olmedo",
"Javier",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | Various prescriptions proposed in the literature to attain the polymeric quantization of a homogeneous and isotropic flat spacetime coupled to a massless scalar field are carefully analyzed in order to discuss their differences. A detailed numerical analysis confirms that, for states which are not deep in the quantum r... |
1410.2528 | Valery Kiselev | Ja.V. Balitsky, V.V. Kiselev | Inflaton as a pseudo-Goldstone boson of vacuum energy shift symmetry | 11 pages; calculations, comments, 2 figures and references added | JCAP 1504 (2015) 032 | 10.1088/1475-7516/2015/04/032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact symmetry induced by the global shift of energy scale for the
cosmological constant in the action of matter fields is spontaneously broken by
setting the density of real vacuum energy and explicitly broken by the gravity
that means the existence of Nambu--Goldstone boson, which transforms into the
pseudo-Gol... | [
{
"created": "Thu, 25 Sep 2014 06:42:37 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2014 07:01:42 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Feb 2015 08:07:02 GMT",
"version": "v3"
}
] | 2019-11-28 | [
[
"Balitsky",
"Ja. V.",
""
],
[
"Kiselev",
"V. V.",
""
]
] | The exact symmetry induced by the global shift of energy scale for the cosmological constant in the action of matter fields is spontaneously broken by setting the density of real vacuum energy and explicitly broken by the gravity that means the existence of Nambu--Goldstone boson, which transforms into the pseudo-Golds... |
gr-qc/9811064 | Martin Goliath | Martin Goliath, Ulf S Nilsson, and Claes Uggla | Spatially self-similar spherically symmetric perfect-fluid models | 21 pages, 6 eps-figures | Class.Quant.Grav. 15 (1998) 167 | 10.1088/0264-9381/15/1/012 | null | gr-qc | null | Einstein's field equations for spatially self-similar spherically symmetric
perfect-fluid models are investigated. The field equations are rewritten as a
first-order system of autonomous differential equations. Dimensionless
variables are chosen in such a way that the number of equations in the coupled
system is redu... | [
{
"created": "Thu, 19 Nov 1998 13:44:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Goliath",
"Martin",
""
],
[
"Nilsson",
"Ulf S",
""
],
[
"Uggla",
"Claes",
""
]
] | Einstein's field equations for spatially self-similar spherically symmetric perfect-fluid models are investigated. The field equations are rewritten as a first-order system of autonomous differential equations. Dimensionless variables are chosen in such a way that the number of equations in the coupled system is reduce... |
1808.07083 | James T. Wheeler | James T Wheeler | General relativity as a biconformal gauge theory | 56 pages | Nucl.Phys. B (2019) 114624 | 10.1016/j.nuclphysb.2019.114624 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the conformal group of a space of dim n=p+q, with SO(p,q) metric.
The quotient of this group by its homogeneous Weyl subgroup gives a principal
fiber bundle with 2n-dim base manifold and Weyl fibers. The Cartan
generalization to a curved 2n-dim geometry admits an action functional linear
in the curvatures... | [
{
"created": "Tue, 21 Aug 2018 18:52:28 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2019 18:29:09 GMT",
"version": "v2"
}
] | 2019-05-03 | [
[
"Wheeler",
"James T",
""
]
] | We consider the conformal group of a space of dim n=p+q, with SO(p,q) metric. The quotient of this group by its homogeneous Weyl subgroup gives a principal fiber bundle with 2n-dim base manifold and Weyl fibers. The Cartan generalization to a curved 2n-dim geometry admits an action functional linear in the curvatures. ... |
1912.04306 | Kieran Finn | Kieran Finn | Initial Conditions of Inflation in a Bianchi I Universe | 5 pages 1 figure | Phys. Rev. D 101, 063512 (2020) | 10.1103/PhysRevD.101.063512 | MAN/HEP/2019/012 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the initial conditions of inflation in a Bianchi~I universe
that is homogeneous but not isotropic. We use the Eisenhart lift to describe
such a theory geometrically as geodesics on a field space manifold. We
construct the phase-space manifold of the theory by considering the tangent
bundle of the field... | [
{
"created": "Mon, 9 Dec 2019 19:00:11 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Finn",
"Kieran",
""
]
] | We investigate the initial conditions of inflation in a Bianchi~I universe that is homogeneous but not isotropic. We use the Eisenhart lift to describe such a theory geometrically as geodesics on a field space manifold. We construct the phase-space manifold of the theory by considering the tangent bundle of the field s... |
2301.11204 | N. Merve Uzun | Ozgur Akarsu, N. Merve Uzun | Cosmological models in scale-independent energy-momentum squared gravity | 11 pages, 1 figure and no tables; matches the version published in
Physics of the Dark Universe | Phys. Dark Univ. 40, 101194 (2023) | 10.1016/j.dark.2023.101194 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scale-independent EMSG is a particular model of energy-momentum squared
gravity (EMSG) in which the new terms in the Einstein field equations arising
from the EMSG theory enter with the same power as the usual terms from
Einstein-Hilbert part of the action. However, the model violates the local
energy-momentum conser... | [
{
"created": "Thu, 26 Jan 2023 16:26:52 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2023 09:17:16 GMT",
"version": "v2"
}
] | 2023-02-24 | [
[
"Akarsu",
"Ozgur",
""
],
[
"Uzun",
"N. Merve",
""
]
] | Scale-independent EMSG is a particular model of energy-momentum squared gravity (EMSG) in which the new terms in the Einstein field equations arising from the EMSG theory enter with the same power as the usual terms from Einstein-Hilbert part of the action. However, the model violates the local energy-momentum conserva... |
1708.01344 | Taishi Ikeda | Taishi Ikeda, Chul-Moon Yoo, Vitor Cardoso | Self-gravitating oscillons and new critical behavior | 24 figures | Phys. Rev. D 96, 064047 (2017) | 10.1103/PhysRevD.96.064047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamical evolution of self-interacting scalars is of paramount
importance in cosmological settings, and can teach us about the content of
Einstein's equations. In flat space, nonlinear scalar field theories can give
rise to localized, non-singular, time-dependent, long-lived solutions called
{\it oscillons}. Her... | [
{
"created": "Fri, 4 Aug 2017 01:26:13 GMT",
"version": "v1"
}
] | 2017-10-04 | [
[
"Ikeda",
"Taishi",
""
],
[
"Yoo",
"Chul-Moon",
""
],
[
"Cardoso",
"Vitor",
""
]
] | The dynamical evolution of self-interacting scalars is of paramount importance in cosmological settings, and can teach us about the content of Einstein's equations. In flat space, nonlinear scalar field theories can give rise to localized, non-singular, time-dependent, long-lived solutions called {\it oscillons}. Here,... |
2012.11859 | Tomohiro Ishikawa | Tomohiro Ishikawa, Shoki Iwaguchi, Yuta Michimura, Masaki Ando, Rika
Yamada, Izumi Watanabe, Koji Nagano, Tomotada Akutsu, Kentaro Komori, Mitsuru
Musha, Takeo Naito, Taigen Morimoto, Seiji Kawamura | Improvement of the target sensitivity in DECIGO by optimizing its
parameters for quantum noise including the effect of diffraction loss | 13 pages, 12 figures | null | 10.3390/galaxies9010014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | DECIGO is the future Japanese gravitational wave detector in outer space. We
previously set the default design parameters to provide a good target
sensitivity to detect the primordial gravitational waves (GWs). However, the
updated upper limit of the primordial GWs by the Planck observations motivated
us for further ... | [
{
"created": "Tue, 22 Dec 2020 07:05:50 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Mar 2021 07:48:35 GMT",
"version": "v2"
}
] | 2021-03-10 | [
[
"Ishikawa",
"Tomohiro",
""
],
[
"Iwaguchi",
"Shoki",
""
],
[
"Michimura",
"Yuta",
""
],
[
"Ando",
"Masaki",
""
],
[
"Yamada",
"Rika",
""
],
[
"Watanabe",
"Izumi",
""
],
[
"Nagano",
"Koji",
""
],
[
"... | DECIGO is the future Japanese gravitational wave detector in outer space. We previously set the default design parameters to provide a good target sensitivity to detect the primordial gravitational waves (GWs). However, the updated upper limit of the primordial GWs by the Planck observations motivated us for further op... |
2301.10036 | Daniel Brito de Freitas | C. V. da Silva, M. M. F. Nepomuceno and D. B. de Freitas | Multiscale structure of the gravitational wave signal from GW150914
based on the nonextensivity $q$-triplet | 7 pages, 6 figures | null | 10.1209/0295-5075/acbc94 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the first gravitational wave, GW150914, detected by advanced LIGO
and constructed from the data of measurement of strain relative deformation of
the fabric of spacetime. We show that the time series from the gravitational
wave obeys Tsallis's $q$-Gaussian distribution as a probability density and its
dynamic... | [
{
"created": "Tue, 24 Jan 2023 14:25:38 GMT",
"version": "v1"
}
] | 2023-03-15 | [
[
"da Silva",
"C. V.",
""
],
[
"Nepomuceno",
"M. M. F.",
""
],
[
"de Freitas",
"D. B.",
""
]
] | We study the first gravitational wave, GW150914, detected by advanced LIGO and constructed from the data of measurement of strain relative deformation of the fabric of spacetime. We show that the time series from the gravitational wave obeys Tsallis's $q$-Gaussian distribution as a probability density and its dynamics ... |
gr-qc/0002010 | Sukanta Bose | Sukanta Bose, Archana Pai, and Sanjeev Dhurandhar | Detection of gravitational waves from inspiraling compact binaries using
a network of interferometric detectors | 6 pages, RevTeX. Based on talk given at GWDAW-99, Rome | Int.J.Mod.Phys. D9 (2000) 325-329 | 10.1142/S0218271800000360 | IUCAA-2/2000 | gr-qc astro-ph | null | We formulate the data analysis problem for the detection of the Newtonian
waveform from an inspiraling compact-binary by a network of arbitrarily
oriented and arbitrarily distributed laser interferometric gravitational wave
detectors. We obtain for the first time the relation between the optimal
statistic and the mag... | [
{
"created": "Wed, 2 Feb 2000 18:32:03 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bose",
"Sukanta",
""
],
[
"Pai",
"Archana",
""
],
[
"Dhurandhar",
"Sanjeev",
""
]
] | We formulate the data analysis problem for the detection of the Newtonian waveform from an inspiraling compact-binary by a network of arbitrarily oriented and arbitrarily distributed laser interferometric gravitational wave detectors. We obtain for the first time the relation between the optimal statistic and the magni... |
gr-qc/9801025 | Sergey V. Sushkov | Sergey V. Sushkov | Particle Creation Near the Chronology Horizon | 6 pages, RevTeX, one postscript figure. Presented in the GR15,
December, 1997, IUCAA, Pune. Submitted to Phys.Rev.D | Phys.Rev. D58 (1998) 044006 | 10.1103/PhysRevD.58.044006 | KGPU-97-01 | gr-qc | null | We investigate the phenomenon of particle creation of the massless scalar
field in the model of spacetime in which, depending on the model's parameter
$\aout$, the chronology horizon could be formed. The model represents a
two-dimensional curved spacetime with the topology $R^1 \times S^1$ which is
asymptotically fla... | [
{
"created": "Fri, 9 Jan 1998 14:52:22 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Sushkov",
"Sergey V.",
""
]
] | We investigate the phenomenon of particle creation of the massless scalar field in the model of spacetime in which, depending on the model's parameter $\aout$, the chronology horizon could be formed. The model represents a two-dimensional curved spacetime with the topology $R^1 \times S^1$ which is asymptotically flat ... |
2201.02112 | Quentin Vigneron | Quentin Vigneron | On non-Euclidean Newtonian theories and their cosmological backreaction | Published in Classical and Quantum Gravity | null | 10.1088/1361-6382/ac7a87 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Constructing an extension of Newton's theory which is defined on a
non-Euclidean topology (in the sense of Thurston's decomposition), called a
non-Euclidean Newtonian theory, corresponding to the zeroth order of a
non-relativistic limit of general relativity is an important step in the study
of the backreaction probl... | [
{
"created": "Thu, 6 Jan 2022 15:49:10 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2022 08:43:42 GMT",
"version": "v2"
}
] | 2022-06-23 | [
[
"Vigneron",
"Quentin",
""
]
] | Constructing an extension of Newton's theory which is defined on a non-Euclidean topology (in the sense of Thurston's decomposition), called a non-Euclidean Newtonian theory, corresponding to the zeroth order of a non-relativistic limit of general relativity is an important step in the study of the backreaction problem... |
1310.2144 | Ujjal Debnath | Ujjal Debnath | Constraining the Parameters of Modified Chaplygin Gas in Einstein-Aether
Gravity | 16 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1206.0507, arXiv:1304.6713 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have assumed FRW model of the universe in Einstein-Aether gravity filled
with dark matter and Modified Chaplygin gas (MCG) type dark energy. We present
the Hubble parameter in terms of some unknown parameters and observational
parameters with the redshift z. From observed Hubble data (OHD) set (12
points), we have... | [
{
"created": "Sun, 6 Oct 2013 13:23:36 GMT",
"version": "v1"
}
] | 2013-10-09 | [
[
"Debnath",
"Ujjal",
""
]
] | We have assumed FRW model of the universe in Einstein-Aether gravity filled with dark matter and Modified Chaplygin gas (MCG) type dark energy. We present the Hubble parameter in terms of some unknown parameters and observational parameters with the redshift z. From observed Hubble data (OHD) set (12 points), we have o... |
1609.08373 | Sebasti\'an Bahamonde | Sebastian Bahamonde, M. Zubair, G. Abbas | Thermodynamics and cosmological reconstruction in $f(T,B)$ gravity | Accepted for publication in Physics of the Dark Universe. Some
notations and definitions have been changed but the conclusions are the same | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, it was formulated a teleparallel theory called $f(T,B)$ gravity
which connects both $f(T)$ and $f(R)$ under suitable limits. In this theory,
the function in the action is assumed to depend on the torsion scalar $T$ and
also on a boundary term related with the divergence of torsion,
$B=2\nabla_{\mu}T^{\mu}$.... | [
{
"created": "Tue, 27 Sep 2016 12:21:47 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 2017 15:12:29 GMT",
"version": "v2"
}
] | 2017-12-19 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Zubair",
"M.",
""
],
[
"Abbas",
"G.",
""
]
] | Recently, it was formulated a teleparallel theory called $f(T,B)$ gravity which connects both $f(T)$ and $f(R)$ under suitable limits. In this theory, the function in the action is assumed to depend on the torsion scalar $T$ and also on a boundary term related with the divergence of torsion, $B=2\nabla_{\mu}T^{\mu}$. I... |
1911.04380 | Emil M. Prodanov | Rossen I. Ivanov and Emil M. Prodanov | On the Cosmological Models with Matter Creation | 19 pages, 1 figure, to appear in European Physical Journal C | European Physical Journal C (2019) 79:118 | 10.1140/epjc/s10052-019-7475-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The matter creation model of Prigogine--G\'eh\'eniau--Gunzig--Nardone is
revisited in terms of a redefined creation pressure which does not lead to
irreversible adiabatic evolution at constant specific entropy. With the
resulting freedom to choose a particular gas process, a flat FRWL cosmological
model is proposed b... | [
{
"created": "Mon, 11 Nov 2019 16:45:29 GMT",
"version": "v1"
}
] | 2022-09-15 | [
[
"Ivanov",
"Rossen I.",
""
],
[
"Prodanov",
"Emil M.",
""
]
] | The matter creation model of Prigogine--G\'eh\'eniau--Gunzig--Nardone is revisited in terms of a redefined creation pressure which does not lead to irreversible adiabatic evolution at constant specific entropy. With the resulting freedom to choose a particular gas process, a flat FRWL cosmological model is proposed bas... |
2305.02013 | Alexander B. Balakin | Alexander B. Balakin and Anna O. Efremova | Dynamic aether as a trigger for spontaneous spinorization in early
Universe | 12 pages, 4 figures | Universe. 2023, 9, 481 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the Einstein-Dirac-aether theory we consider a
phenomenological model of the spontaneous growth of the fermion number, which
is triggered by the dynamic aether. The trigger version of spinorization of the
early Universe is associated with two mechanisms: the first one is the aetheric
regulation of... | [
{
"created": "Wed, 3 May 2023 10:05:00 GMT",
"version": "v1"
}
] | 2023-11-15 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Efremova",
"Anna O.",
""
]
] | In the framework of the Einstein-Dirac-aether theory we consider a phenomenological model of the spontaneous growth of the fermion number, which is triggered by the dynamic aether. The trigger version of spinorization of the early Universe is associated with two mechanisms: the first one is the aetheric regulation of b... |
1511.05790 | Przemyslaw Malkiewicz | Herve Bergeron, Ewa Czuchry, Jean-Pierre Gazeau and Przemyslaw
Malkiewicz | Nonadiabatic bounce and an inflationary phase in the quantum mixmaster
universe | 32 pages, 9 figures | Phys. Rev. D 93, 124053 (2016) | 10.1103/PhysRevD.93.124053 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following our previous paper, Bergeron et al, Smooth quantum dynamics of the
mixmaster universe, Phys. Rev. D 92, 061302(R) (2015), concerning the
quantization of the vacuum Bianchi IX model and the Born-Huang-Oppenheimer
framework, we present a further analysis of the dynamical properties of the
model. Consistently ... | [
{
"created": "Wed, 18 Nov 2015 14:12:04 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2016 18:21:28 GMT",
"version": "v2"
}
] | 2016-06-29 | [
[
"Bergeron",
"Herve",
""
],
[
"Czuchry",
"Ewa",
""
],
[
"Gazeau",
"Jean-Pierre",
""
],
[
"Malkiewicz",
"Przemyslaw",
""
]
] | Following our previous paper, Bergeron et al, Smooth quantum dynamics of the mixmaster universe, Phys. Rev. D 92, 061302(R) (2015), concerning the quantization of the vacuum Bianchi IX model and the Born-Huang-Oppenheimer framework, we present a further analysis of the dynamical properties of the model. Consistently wi... |
gr-qc/9904057 | null | Thibault Damour | Experimental Tests of Relativistic Gravity | 10 pages, latex, uses espcrc2.sty, invited talk at the 1998 Texas
Symposium (to appear in Nucl. Phys. B (Proceedings Supplement)) | Nucl.Phys.Proc.Suppl. 80 (2000) 41-50 | 10.1016/S0920-5632(99)00828-2 | IHES/P/99/31 | gr-qc | null | The confrontation between Einstein's gravitation theory and experimental
results, notably binary pulsar data, is summarized and its significance
discussed. Experiment and theory agree at the 10^{-3} level or better. All the
basic structures of Einstein's theory (coupling of gravity to matter;
propagation and self-int... | [
{
"created": "Thu, 22 Apr 1999 13:34:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Damour",
"Thibault",
""
]
] | The confrontation between Einstein's gravitation theory and experimental results, notably binary pulsar data, is summarized and its significance discussed. Experiment and theory agree at the 10^{-3} level or better. All the basic structures of Einstein's theory (coupling of gravity to matter; propagation and self-inter... |
2210.05216 | Simon Jacobsson | Simon Jacobsson and Thomas B\"ackdahl | Second order symmetry operators for the massive Dirac equation | 16 pages | 2023 Class. Quantum Grav. 40 045009 | 10.1088/1361-6382/acb3a9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Employing the covariant language of two-spinors, we find what conditions a
curved Lorentzian spacetime must satisfy for existence of a second order
symmetry operator for the massive Dirac equation. The conditions are formulated
as existence of a set of Killing spinors satisfying a set of covariant linear
differential... | [
{
"created": "Tue, 11 Oct 2022 07:32:52 GMT",
"version": "v1"
}
] | 2023-02-02 | [
[
"Jacobsson",
"Simon",
""
],
[
"Bäckdahl",
"Thomas",
""
]
] | Employing the covariant language of two-spinors, we find what conditions a curved Lorentzian spacetime must satisfy for existence of a second order symmetry operator for the massive Dirac equation. The conditions are formulated as existence of a set of Killing spinors satisfying a set of covariant linear differential e... |
1505.04189 | Carlos A. R. Herdeiro | Carlos A. R. Herdeiro and Eugen Radu | How fast can a black hole rotate? | 10 pages, 2 figures, Essay written for the Gravity Research
Foundation 2015 Awards for Essays on Gravitation and selected for Honorable
Mention | null | 10.1142/S0218271815440228 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kerr black holes have their angular momentum, $J$, bounded by their mass,
$M$: $Jc\leqslant GM^2$. There are, however, known black hole solutions
violating this Kerr bound. We propose a very simple universal bound on the
rotation, rather than on the angular momentum, of four-dimensional, stationary
and axisymmetric, ... | [
{
"created": "Fri, 15 May 2015 20:00:17 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Radu",
"Eugen",
""
]
] | Kerr black holes have their angular momentum, $J$, bounded by their mass, $M$: $Jc\leqslant GM^2$. There are, however, known black hole solutions violating this Kerr bound. We propose a very simple universal bound on the rotation, rather than on the angular momentum, of four-dimensional, stationary and axisymmetric, as... |
2007.08049 | Fabao Gao | Fabao Gao and Jaume Llibre | Global dynamics of the Horava-Lifshitz cosmological model in a non-flat
universe with non-zero cosmological constant | 60 pages, 34 figures | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When the cosmological constant is non-zero the dynamics of the cosmological
model based on Horava-Lifshitz gravity in a non-flat universe is characterized
by using the qualitative theory of differential equations.
| [
{
"created": "Thu, 16 Jul 2020 00:41:11 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Oct 2021 15:34:48 GMT",
"version": "v2"
}
] | 2021-10-19 | [
[
"Gao",
"Fabao",
""
],
[
"Llibre",
"Jaume",
""
]
] | When the cosmological constant is non-zero the dynamics of the cosmological model based on Horava-Lifshitz gravity in a non-flat universe is characterized by using the qualitative theory of differential equations. |
0807.0945 | Narayan Banerjee | Narayan Banerjee and Koyel Ganguly | Generalised scalar-tensor theory and the cosmic acceleration | Typos (author's name!)corrected | Int.J.Mod.Phys.D18:445-451,2009 | 10.1142/S0218271809014479 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it has been shown that a simple functional form of
$\omega(\phi)$ in a generalised scalar tensor theory can drive the present
cosmic acceleration without any quintessence field or the cosmological constant
$\Lambda$. Furthermore, it ensures a smooth transition from a decelerated to an
accelerated phase ... | [
{
"created": "Mon, 7 Jul 2008 05:21:14 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jul 2008 05:16:42 GMT",
"version": "v2"
}
] | 2009-07-22 | [
[
"Banerjee",
"Narayan",
""
],
[
"Ganguly",
"Koyel",
""
]
] | In this paper it has been shown that a simple functional form of $\omega(\phi)$ in a generalised scalar tensor theory can drive the present cosmic acceleration without any quintessence field or the cosmological constant $\Lambda$. Furthermore, it ensures a smooth transition from a decelerated to an accelerated phase of... |
2203.11495 | Paritosh Verma | Paritosh Verma | Radiation from a Classical Harmonic Oscillator | null | null | null | null | gr-qc physics.class-ph | http://creativecommons.org/licenses/by/4.0/ | This article presents the calculation of gravitational and electromagnetic
radiation emitted from a classical simple harmonic oscillator (SHO). Here we
show only the selected formulae and apply them to a toy problem without
rigorous derivation. First, we calculate the explicit expressions for the
gravitational waves ... | [
{
"created": "Tue, 22 Mar 2022 07:09:39 GMT",
"version": "v1"
}
] | 2022-03-23 | [
[
"Verma",
"Paritosh",
""
]
] | This article presents the calculation of gravitational and electromagnetic radiation emitted from a classical simple harmonic oscillator (SHO). Here we show only the selected formulae and apply them to a toy problem without rigorous derivation. First, we calculate the explicit expressions for the gravitational waves po... |
1701.01296 | Stefan Palenta | Stefan Palenta and Reinhard Meinel | A continuous Riemann-Hilbert problem for colliding plane gravitational
waves | 34 pages, 9 figures, section 7 and appendix added | Class.Quant.Grav.34:195011,2017 | 10.1088/1361-6382/aa88dd | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the foundations of a new solution technique for the characteristic
initial value problem (IVP) of colliding plane gravitational waves. It has
extensive similarities to the approach of Alekseev and Griffiths in 2001, but
we use an inverse scattering method with a Riemann-Hilbert problem (RHP), which
allows ... | [
{
"created": "Thu, 5 Jan 2017 12:45:33 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2017 16:32:12 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jul 2017 11:44:07 GMT",
"version": "v3"
},
{
"created": "Mon, 22 Jan 2018 16:24:42 GMT",
"version": "v4"
}
] | 2018-01-23 | [
[
"Palenta",
"Stefan",
""
],
[
"Meinel",
"Reinhard",
""
]
] | We present the foundations of a new solution technique for the characteristic initial value problem (IVP) of colliding plane gravitational waves. It has extensive similarities to the approach of Alekseev and Griffiths in 2001, but we use an inverse scattering method with a Riemann-Hilbert problem (RHP), which allows fo... |
1807.09558 | Jiacheng Ding | Jia-Cheng Ding, Ping Li, Cong Li, Qi-Qi Fan, Jian-Bo Deng | The evolution of universe in the two-scalar theory | 19 pages,1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize f(R,T) gravity into the two-scalar theory that includes two
independent scalar fields by the variational method, and we derive its field
equations in Einstein frame using conformal transformation. Based on Friedmann
equations and Raychaudhuri equation, with a consideration of the cosmic content
as its p... | [
{
"created": "Wed, 25 Jul 2018 12:54:11 GMT",
"version": "v1"
}
] | 2018-07-26 | [
[
"Ding",
"Jia-Cheng",
""
],
[
"Li",
"Ping",
""
],
[
"Li",
"Cong",
""
],
[
"Fan",
"Qi-Qi",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | We generalize f(R,T) gravity into the two-scalar theory that includes two independent scalar fields by the variational method, and we derive its field equations in Einstein frame using conformal transformation. Based on Friedmann equations and Raychaudhuri equation, with a consideration of the cosmic content as its per... |
2012.03965 | Eric Linder | Eric V. Linder, Stephen Appleby | An Expansion of Well Tempered Gravity | 7 pages | JCAP 2103, 074 (2021) | 10.1088/1475-7516/2021/03/074 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | When faced with two nigh intractable problems in cosmology -- how to remove
the original cosmological constant problem and how to parametrize modified
gravity to explain current cosmic acceleration -- we can make progress by
counterposing them. The well tempered solution to the cosmological constant
through degenerat... | [
{
"created": "Mon, 7 Dec 2020 19:00:02 GMT",
"version": "v1"
}
] | 2021-04-06 | [
[
"Linder",
"Eric V.",
""
],
[
"Appleby",
"Stephen",
""
]
] | When faced with two nigh intractable problems in cosmology -- how to remove the original cosmological constant problem and how to parametrize modified gravity to explain current cosmic acceleration -- we can make progress by counterposing them. The well tempered solution to the cosmological constant through degenerate ... |
2303.02464 | Tiberiu Harko | Teodora Matei, Tiberiu Harko, Gabriela Mocanu | Dark matter and radiation production during warm inflation in a curved
Universe-an irreversible thermodynamic approach | 17 pages, 5 figures, accepted for publication in the Romanian
Astronomical Journal | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the creation of dark matter particles as a result of the decay
of the scalar field in the framework of warm inflationary models, by using the
irreversible thermodynamics of open systems with matter creation/annihilation.
We consider the scalar fields, radiation and dark matter as an interacting
three c... | [
{
"created": "Sat, 4 Mar 2023 17:49:01 GMT",
"version": "v1"
}
] | 2023-03-07 | [
[
"Matei",
"Teodora",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Mocanu",
"Gabriela",
""
]
] | We investigate the creation of dark matter particles as a result of the decay of the scalar field in the framework of warm inflationary models, by using the irreversible thermodynamics of open systems with matter creation/annihilation. We consider the scalar fields, radiation and dark matter as an interacting three com... |
1908.00037 | Carlos A. R. Herdeiro | Pedro G. S. Fernandes, Carlos A. R. Herdeiro, Alexandre M. Pombo,
Eugen Radu, Nicolas Sanchis-Gual | Charged black holes with axionic-type couplings: classes of solutions
and dynamical scalarisation | 23 pages, 13 figures | Phys. Rev. D 100, 084045 (2019) | 10.1103/PhysRevD.100.084045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an augmented Einstein-Maxwell-scalar model including an
axionic-type coupling between the scalar and electromagnetic field. We study
dyonic black hole solutions in this model. For the canonical axionic coupling
emerging from high energy physics, all charged black holes have axion hair. We
present their do... | [
{
"created": "Wed, 31 Jul 2019 18:28:47 GMT",
"version": "v1"
}
] | 2019-10-30 | [
[
"Fernandes",
"Pedro G. S.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Pombo",
"Alexandre M.",
""
],
[
"Radu",
"Eugen",
""
],
[
"Sanchis-Gual",
"Nicolas",
""
]
] | We consider an augmented Einstein-Maxwell-scalar model including an axionic-type coupling between the scalar and electromagnetic field. We study dyonic black hole solutions in this model. For the canonical axionic coupling emerging from high energy physics, all charged black holes have axion hair. We present their doma... |
1812.04350 | Wen-Biao Han | Shu-Cheng Yang, Wen-Biao Han, Shuo Xin, Chen Zhang | Testing dispersion of gravitational waves from eccentric
extreme-mass-ratio inspirals | 15 pages, 7 figures | Int. J. Mod. Phys. D, 28, 1950166, 2019 | 10.1142/S0218271819501669 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity, there is no dispersion in gravitational waves, while
some modified gravity theories predict dispersion phenomena in the propagation
of gravitational waves. In this paper, we demonstrate that this dispersion will
induce an observable deviation of waveforms if the orbits have large
eccentricities... | [
{
"created": "Tue, 11 Dec 2018 12:21:51 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jan 2020 13:25:18 GMT",
"version": "v2"
}
] | 2020-01-17 | [
[
"Yang",
"Shu-Cheng",
""
],
[
"Han",
"Wen-Biao",
""
],
[
"Xin",
"Shuo",
""
],
[
"Zhang",
"Chen",
""
]
] | In general relativity, there is no dispersion in gravitational waves, while some modified gravity theories predict dispersion phenomena in the propagation of gravitational waves. In this paper, we demonstrate that this dispersion will induce an observable deviation of waveforms if the orbits have large eccentricities. ... |
2204.09891 | Yakov Shlapentokh-Rothman | Yakov Shlapentokh-Rothman | Naked Singularities for the Einstein Vacuum Equations: The Interior
Solution | 166 pages, 5 figures | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous work [I. Rodnianski and Y. Shlapentokh-Rothman, Naked
Singularities for the Einstein Vacuum Equations: The Exterior Solution,
arXiv:1912.08478] we constructed solutions to the Einstein vacuum equations in
3+1 dimensions which corresponded to the exterior region of a naked
singularity. In this work we co... | [
{
"created": "Thu, 21 Apr 2022 05:34:24 GMT",
"version": "v1"
}
] | 2022-04-22 | [
[
"Shlapentokh-Rothman",
"Yakov",
""
]
] | In a previous work [I. Rodnianski and Y. Shlapentokh-Rothman, Naked Singularities for the Einstein Vacuum Equations: The Exterior Solution, arXiv:1912.08478] we constructed solutions to the Einstein vacuum equations in 3+1 dimensions which corresponded to the exterior region of a naked singularity. In this work we cons... |
gr-qc/9906114 | Lorenzo Fatibene | L. Fatibene, M. Ferraris, M. Francaviglia, M. Raiteri | The Entropy of Taub-Bolt Solution | null | Annals Phys. 284 (2000) 197-214 | 10.1006/aphy.2000.6062 | null | gr-qc | null | A geometrical framework for the definition of entropy in General Relativity
via Noether theorem is briefly recalled and the entropy of Taub-Bolt Euclidean
solutions of Einstein equations is then obtained as an application. The
computed entropy agrees with previously known results, obtained by statistical
methods. It ... | [
{
"created": "Tue, 29 Jun 1999 07:34:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fatibene",
"L.",
""
],
[
"Ferraris",
"M.",
""
],
[
"Francaviglia",
"M.",
""
],
[
"Raiteri",
"M.",
""
]
] | A geometrical framework for the definition of entropy in General Relativity via Noether theorem is briefly recalled and the entropy of Taub-Bolt Euclidean solutions of Einstein equations is then obtained as an application. The computed entropy agrees with previously known results, obtained by statistical methods. It wa... |
1212.1930 | Christopher Coleman-Smith | C. E. Coleman-Smith, B. Muller | A "Helium Atom" of Space: Dynamical Instability of the Isochoric
Pentahedron | 20 Pages, 19 Figures. Updated to submitted version, minor edits | null | 10.1103/PhysRevD.87.044047 | null | gr-qc hep-th nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis of the dynamics of the equifacial pentahedron on the
Kapovich-Millson phase space under a volume preserving Hamiltonian. The
classical dynamics of polyhedra under such a Hamiltonian may arise from the
classical limit of the node volume operators in loop quantum gravity. The
pentahedron is the s... | [
{
"created": "Sun, 9 Dec 2012 22:49:38 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jan 2013 00:57:02 GMT",
"version": "v2"
}
] | 2013-03-14 | [
[
"Coleman-Smith",
"C. E.",
""
],
[
"Muller",
"B.",
""
]
] | We present an analysis of the dynamics of the equifacial pentahedron on the Kapovich-Millson phase space under a volume preserving Hamiltonian. The classical dynamics of polyhedra under such a Hamiltonian may arise from the classical limit of the node volume operators in loop quantum gravity. The pentahedron is the sim... |
1001.3951 | Christian Corda cordac | Lorenzo Iorio and Christian Corda | Gravitomagnetism and gravitational waves | To appear in the Special Issue of The Open Astronomy Journal "The Big
Challenge of Gravitational Waves, a New Window into the Universe", Editors
Christian Corda, Herman J. Mosquera Cuesta, Oswaldo Miranda and Theodore
Simos | The Open Astronomy Journal, 2011, 4, (Suppl 1-M5) 84-97 | 10.2174/1874381101004010084 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After extensively reviewing general relativistic gravitomagnetism, both
historically and phenomenologically, we review in detail the so-called magnetic
components of gravitational waves (GWs), which have to be taken into account in
the context of the total response functions of interferometers for GWs
propagating fro... | [
{
"created": "Fri, 22 Jan 2010 10:17:38 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 2010 11:09:34 GMT",
"version": "v2"
}
] | 2011-08-25 | [
[
"Iorio",
"Lorenzo",
""
],
[
"Corda",
"Christian",
""
]
] | After extensively reviewing general relativistic gravitomagnetism, both historically and phenomenologically, we review in detail the so-called magnetic components of gravitational waves (GWs), which have to be taken into account in the context of the total response functions of interferometers for GWs propagating from ... |
2206.00656 | Arun Rana | Asha B Modan, Sukanta Panda, Arun Rana | Imprints of Anisotropy on the Power Spectrum in Matter Dominated
Bouncing Universe as Background | 12 pages, 3 figures, added new references and few typos corrected | null | 10.1140/epjc/s10052-022-10867-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we aim to investigate the effects of the anisotropy on the
scale-invariant power spectrum considering the matter-dominated collapsing
universe as background and look for the deviations from this scale invariance.
Having set up this background, we consider a massless scalar field and work out
the correl... | [
{
"created": "Wed, 1 Jun 2022 17:47:48 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2022 06:52:16 GMT",
"version": "v2"
}
] | 2022-10-26 | [
[
"Modan",
"Asha B",
""
],
[
"Panda",
"Sukanta",
""
],
[
"Rana",
"Arun",
""
]
] | In this paper, we aim to investigate the effects of the anisotropy on the scale-invariant power spectrum considering the matter-dominated collapsing universe as background and look for the deviations from this scale invariance. Having set up this background, we consider a massless scalar field and work out the correlat... |
1101.2841 | Gonzalo Olmo | Gonzalo J. Olmo | Palatini Actions and Quantum Gravity Phenomenology | 16 pages, 1 figure. Enlarged version with examples that explicitly
show how the "soccer ball problem" is solved in this scenario. References
added and several small changes here and there to match with the published
version | null | 10.1088/1475-7516/2011/10/018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that an invariant an universal length scale can be consistently
introduced in a generally covariant theory through the gravitational sector
using the Palatini approach. The resulting theory is able to capture different
aspects of quantum gravity phenomenology in a single framework. In particular,
it is found ... | [
{
"created": "Fri, 14 Jan 2011 15:30:31 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2011 17:32:58 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Olmo",
"Gonzalo J.",
""
]
] | We show that an invariant an universal length scale can be consistently introduced in a generally covariant theory through the gravitational sector using the Palatini approach. The resulting theory is able to capture different aspects of quantum gravity phenomenology in a single framework. In particular, it is found th... |
1204.0589 | J. Ponce de Leon | J. Ponce de Leon | Cosmological model with variable equations of state for matter and dark
energy | null | Published in Class.Quant.Grav. 29 (2012) 135009 | 10.1088/0264-9381/29/13/135009 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a cosmological model which is physically reasonable,
mathematically tractable, and extends the study of CDM models to the case where
the equations of state (EoS) for matter and dark energy (DE) vary with time. It
is based on the assumptions of (i) flatness, (ii) validity of general
relativity, (iii) the ... | [
{
"created": "Tue, 3 Apr 2012 03:51:58 GMT",
"version": "v1"
}
] | 2012-06-14 | [
[
"de Leon",
"J. Ponce",
""
]
] | We construct a cosmological model which is physically reasonable, mathematically tractable, and extends the study of CDM models to the case where the equations of state (EoS) for matter and dark energy (DE) vary with time. It is based on the assumptions of (i) flatness, (ii) validity of general relativity, (iii) the pr... |
1606.02826 | Muxin Han | Muxin Han, Mingyi Zhang | On Spinfoams Near a Classical Curvature Singularity | 17 pages, 1 figure, minor modifications | Phys. Rev. D 94, 104075 (2016) | 10.1103/PhysRevD.94.104075 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the technique of spinfoam to study the space-time which,
classically, contains a curvature singularity. We derive from the full
covariant Loop Quantum Gravity (LQG) that the region near curvature singularity
has to be of strong quantum gravity effect. We show that the spinfoam
configuration describing the ne... | [
{
"created": "Thu, 9 Jun 2016 05:17:53 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2017 21:33:13 GMT",
"version": "v2"
}
] | 2017-01-24 | [
[
"Han",
"Muxin",
""
],
[
"Zhang",
"Mingyi",
""
]
] | We apply the technique of spinfoam to study the space-time which, classically, contains a curvature singularity. We derive from the full covariant Loop Quantum Gravity (LQG) that the region near curvature singularity has to be of strong quantum gravity effect. We show that the spinfoam configuration describing the near... |
gr-qc/0308055 | Marsha Weaver | Marsha Weaver | On the area of the symmetry orbits in $T^2$ symmetric spacetimes with
Vlasov matter | 27 pages, version 2 minor changes and corrections | Class.Quant.Grav. 21 (2004) 1079-1098 | 10.1088/0264-9381/21/4/023 | null | gr-qc | null | This paper treats the global existence question for a collection of general
relativistic collisionless particles, all having the same mass. The spacetimes
considered are globally hyperbolic, with Cauchy surface a 3-torus. Furthermore,
the spacetimes considered are isometrically invariant under a two-dimensional
group... | [
{
"created": "Sun, 17 Aug 2003 23:57:09 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Feb 2004 04:56:02 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Weaver",
"Marsha",
""
]
] | This paper treats the global existence question for a collection of general relativistic collisionless particles, all having the same mass. The spacetimes considered are globally hyperbolic, with Cauchy surface a 3-torus. Furthermore, the spacetimes considered are isometrically invariant under a two-dimensional group a... |
1405.1612 | Christos Charmousis | Christos Charmousis | From Lovelock to Horndeski's generalised scalar-tensor theory | Lecture notes from the 7th Aegean summer school "Beyond Einstein's
theory of gravity". No figures, 31 pages, some references and remarks added,
some of the typos present corrected | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review and discuss some recent progress in Lovelock and Horndeski theories
modifying Einstein's General Relativity. Using as our guide the uniqueness
properties of these modified gravity theories we then discuss how Kaluza-Klein
reduction of Lovelock theory can lead to effective scalar-tensor actions
including sev... | [
{
"created": "Wed, 7 May 2014 14:18:38 GMT",
"version": "v1"
},
{
"created": "Thu, 15 May 2014 14:20:22 GMT",
"version": "v2"
}
] | 2014-05-16 | [
[
"Charmousis",
"Christos",
""
]
] | We review and discuss some recent progress in Lovelock and Horndeski theories modifying Einstein's General Relativity. Using as our guide the uniqueness properties of these modified gravity theories we then discuss how Kaluza-Klein reduction of Lovelock theory can lead to effective scalar-tensor actions including sever... |
2207.11848 | Youka Kaku | Youka Kaku, Shin'ya Maeda, Yasusada Nambu, Yuki Osawa | Quantumness of gravity in harmonically trapped particles | 21 pages, accepted version in PRD | null | 10.1103/PhysRevD.106.126005 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | This study investigates the quantumness of gravity under the setup of the
atomic interferometry from the viewpoint of mass-energy equivalence. We
evaluated interference visibility considering a particle with internal energy
levels in a harmonic trapping potential. As per the result, for a spatially
superposed gravita... | [
{
"created": "Sun, 24 Jul 2022 23:36:35 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Dec 2022 06:53:51 GMT",
"version": "v2"
}
] | 2022-12-16 | [
[
"Kaku",
"Youka",
""
],
[
"Maeda",
"Shin'ya",
""
],
[
"Nambu",
"Yasusada",
""
],
[
"Osawa",
"Yuki",
""
]
] | This study investigates the quantumness of gravity under the setup of the atomic interferometry from the viewpoint of mass-energy equivalence. We evaluated interference visibility considering a particle with internal energy levels in a harmonic trapping potential. As per the result, for a spatially superposed gravitati... |
1512.03412 | Abraao Capistrano | A.J.S Capistrano, L.A. Cabral | Implications on the cosmic coincidence by a dynamical extrinsic
curvature | 3 figures | Classical and Quantum Gravity, v. 33, p. 245006, 2016 | 10.1088/0264-9381/33/24/245006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we apply the smooth deformation concept in order to obtain a
modification of Friedmann equations. It is shown that the cosmic coincidence
can be at least alleviated using the dynamical properties of the extrinsic
curvature. We investigate the transition from nucleosynthesis to the
coincidence era obtain... | [
{
"created": "Wed, 9 Dec 2015 15:29:26 GMT",
"version": "v1"
}
] | 2017-04-06 | [
[
"Capistrano",
"A. J. S",
""
],
[
"Cabral",
"L. A.",
""
]
] | In this work, we apply the smooth deformation concept in order to obtain a modification of Friedmann equations. It is shown that the cosmic coincidence can be at least alleviated using the dynamical properties of the extrinsic curvature. We investigate the transition from nucleosynthesis to the coincidence era obtainin... |
1804.07305 | Julian Georg | Julian Georg and Carl Rosenzweig | Can Cosmology Provide a Test of Quantum Mechanics? | null | null | 10.1088/1475-7516/2020/01/028 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inflation predicts that quantum fluctuations determine the large scale
structure of the Universe. This raises the striking possibility that quantum
mechanics, developed to describe nature at short distances, can be tested by
studying nature at its most immense -- cosmology. We illustrate the potential
of such a test ... | [
{
"created": "Thu, 19 Apr 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 6 May 2020 15:24:39 GMT",
"version": "v2"
}
] | 2020-05-07 | [
[
"Georg",
"Julian",
""
],
[
"Rosenzweig",
"Carl",
""
]
] | Inflation predicts that quantum fluctuations determine the large scale structure of the Universe. This raises the striking possibility that quantum mechanics, developed to describe nature at short distances, can be tested by studying nature at its most immense -- cosmology. We illustrate the potential of such a test by... |
2106.02247 | Sebasti\'an N\'ajera Valencia | Sebasti\'an N\'ajera, Aram Aguilar, Celia Escamilla-Rivera, Roberto A.
Sussman | The first non-static inhomogeneous exact solution in $f(T,B)$ gravity | 5 pages | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We examine in this paper the possibility of finding exact solutions for
Teleparallel Gravity (TG) of the type of spherically symmetric Lema\^\i
tre-Tolman-Bondi (LTB) dust models. We apply to the LTB metric, as obtained
from the Schwarzschild solution in General Relativity, the formalism of
Teleparallel Gravity in it... | [
{
"created": "Fri, 4 Jun 2021 04:27:04 GMT",
"version": "v1"
}
] | 2021-06-07 | [
[
"Nájera",
"Sebastián",
""
],
[
"Aguilar",
"Aram",
""
],
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Sussman",
"Roberto A.",
""
]
] | We examine in this paper the possibility of finding exact solutions for Teleparallel Gravity (TG) of the type of spherically symmetric Lema\^\i tre-Tolman-Bondi (LTB) dust models. We apply to the LTB metric, as obtained from the Schwarzschild solution in General Relativity, the formalism of Teleparallel Gravity in its ... |
2111.11634 | Kazufumi Takahashi | Kazufumi Takahashi, Hayato Motohashi, Masato Minamitsuji | Invertible disformal transformations with higher derivatives | 14 pages | Phys. Rev. D 105, 024015 (2022) | 10.1103/PhysRevD.105.024015 | YITP-21-137 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider a higher-derivative generalization of disformal transformations
in $D$-dimensional spacetime and clarify the conditions under which they form a
group with respect to the matrix product and the functional composition. These
conditions allow us to systematically construct the inverse transformation in a
ful... | [
{
"created": "Tue, 23 Nov 2021 03:32:10 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2022 00:43:01 GMT",
"version": "v2"
}
] | 2022-01-06 | [
[
"Takahashi",
"Kazufumi",
""
],
[
"Motohashi",
"Hayato",
""
],
[
"Minamitsuji",
"Masato",
""
]
] | We consider a higher-derivative generalization of disformal transformations in $D$-dimensional spacetime and clarify the conditions under which they form a group with respect to the matrix product and the functional composition. These conditions allow us to systematically construct the inverse transformation in a fully... |
1210.7204 | Alex Venditti | Alex Venditti and Charles Dyer | Choosing a vacuum state in a spherical spacetime with a conformal
Killing vector | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of picking a physically motivated vacuum state on a
spherically symmetric spacetime with an extra conformal Killing vector, as
opposed to an extra Killing vector as in the Schwarzschild case. Considering a
conformal symmetry instead of a symmetry allows us to consider spacetimes that
are dynam... | [
{
"created": "Fri, 26 Oct 2012 17:42:04 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2013 14:48:35 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Mar 2014 03:55:25 GMT",
"version": "v3"
}
] | 2014-03-07 | [
[
"Venditti",
"Alex",
""
],
[
"Dyer",
"Charles",
""
]
] | We consider the problem of picking a physically motivated vacuum state on a spherically symmetric spacetime with an extra conformal Killing vector, as opposed to an extra Killing vector as in the Schwarzschild case. Considering a conformal symmetry instead of a symmetry allows us to consider spacetimes that are dynamic... |
2304.14273 | Dr. Sudhaker Upadhyay | Sudhaker Upadhyay | Bouncing universe for deformed non-minimally coupled inflation model | 15 pages, 4 figures, published in Journal of Holography Applications
in Physics | JHAP 3, Winter 2023, 57 | 10.22128/jhap.2023.651.1038 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we consider a non-minimally coupled gravity model to study the
bouncing universe. The holographic principle has various effects on the
bouncing universe. We choose some suitable new variables and achieve the new
Hamiltonian and Lagrangian which have harmonic oscillator form. The
corresponding Lagrangia... | [
{
"created": "Wed, 26 Apr 2023 15:13:41 GMT",
"version": "v1"
}
] | 2023-04-28 | [
[
"Upadhyay",
"Sudhaker",
""
]
] | In this paper, we consider a non-minimally coupled gravity model to study the bouncing universe. The holographic principle has various effects on the bouncing universe. We choose some suitable new variables and achieve the new Hamiltonian and Lagrangian which have harmonic oscillator form. The corresponding Lagrangian ... |
2304.12147 | Subhayan Maity | Subhayan Maity, Manojit Das | A complete, continuous and non-singular expansion of the Universe under
stimulated creation -annihilation process of the real scalar Bosons: An
introduction to the existence of the Anti Universe and Parallel Universe | The authors want to entertain strong criticism and comments on this
article from the community | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The general theory of relativity is the most popular theory to describe the
dynamics of a system (especially the Universe) under gravity. In this
framework, the solution of the Einstein field equation under curved space-time
yields the cosmic evolution equation. Besides the evolutionary dynamics of the
Universe may a... | [
{
"created": "Mon, 24 Apr 2023 14:57:35 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2023 15:12:05 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Feb 2024 08:37:30 GMT",
"version": "v3"
},
{
"created": "Sun, 4 Feb 2024 09:01:00 GMT",
"version": "v4"
}
] | 2024-02-06 | [
[
"Maity",
"Subhayan",
""
],
[
"Das",
"Manojit",
""
]
] | The general theory of relativity is the most popular theory to describe the dynamics of a system (especially the Universe) under gravity. In this framework, the solution of the Einstein field equation under curved space-time yields the cosmic evolution equation. Besides the evolutionary dynamics of the Universe may als... |
gr-qc/0510042 | T. P. Singh | T. P. Singh (Tata Institute of Fundamental Research, Mumbai) | Quantum mechanics without spacetime: a case for noncommutative geometry | 35 pages, based on an invited talk given at QTS-4 [Fourth
International Conference on Quantum Theory and Symmetries], Varna, Bulgaria,
15-21 August, 2005 | Bulg.J.Phys.33:217,2006 | null | null | gr-qc hep-th quant-ph | null | Quantum mechanics in its presently known formulation requires an external
classical time for its description. A classical spacetime manifold and a
classical spacetime metric are produced by classical matter fields. In the
absence of such classical matter fields, quantum mechanics should be formulated
without referenc... | [
{
"created": "Sun, 9 Oct 2005 09:32:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Singh",
"T. P.",
"",
"Tata Institute of Fundamental Research, Mumbai"
]
] | Quantum mechanics in its presently known formulation requires an external classical time for its description. A classical spacetime manifold and a classical spacetime metric are produced by classical matter fields. In the absence of such classical matter fields, quantum mechanics should be formulated without reference ... |
gr-qc/0510029 | Peter D'Eath | A.N.St.J.Farley and P.D.D'Eath | Quantum Amplitudes in Black-Hole Evaporation II. Spin-0 Amplitude | null | null | null | null | gr-qc | null | This work on spin-0 amplitudes in black-hole evaporation is based on the
underlying results and methods outlined in our first paper, "I. Complex
Approach". The main result here, and the model calculation for work on all
higher spins, as described in several further papers, is the computation of the
quantum amplitude ... | [
{
"created": "Fri, 7 Oct 2005 16:29:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Farley",
"A. N. St. J.",
""
],
[
"D'Eath",
"P. D.",
""
]
] | This work on spin-0 amplitudes in black-hole evaporation is based on the underlying results and methods outlined in our first paper, "I. Complex Approach". The main result here, and the model calculation for work on all higher spins, as described in several further papers, is the computation of the quantum amplitude (r... |
2112.06359 | Nobuyoshi Komatsu | Nobuyoshi Komatsu | Energy stored on a cosmological horizon and its thermodynamic
fluctuations in holographic equipartition law | Final version accepted for publication in PRD. Typos are corrected
and references are updated. [12 pages, 1 figure] | Phys. Rev. D 105, 043534 (2022) | 10.1103/PhysRevD.105.043534 | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by/4.0/ | Our Universe is expected to finally approach a de Sitter universe whose
horizon is considered to be in thermal equilibrium. In the present article,
both the energy stored on the horizon and its thermodynamic fluctuations are
examined through the holographic equipartition law. First, it is confirmed that
a flat Friedm... | [
{
"created": "Mon, 13 Dec 2021 00:18:59 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Feb 2022 04:28:20 GMT",
"version": "v2"
}
] | 2022-02-25 | [
[
"Komatsu",
"Nobuyoshi",
""
]
] | Our Universe is expected to finally approach a de Sitter universe whose horizon is considered to be in thermal equilibrium. In the present article, both the energy stored on the horizon and its thermodynamic fluctuations are examined through the holographic equipartition law. First, it is confirmed that a flat Friedman... |
1911.10818 | Alessandro Nagar | Piero Rettegno, Fabio Martinetti, Alessandro Nagar, Donato Bini,
Gunnar Riemenschneider, and Thibault Damour | Comparing Effective One Body Hamiltonians for spin-aligned coalescing
binaries | 23 pages, 13 figures. Submitted to Phys. Rev. D | Phys. Rev. D 101, 104027 (2020) | 10.1103/PhysRevD.101.104027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | TEOBResumS and SEOBNRv4 are the two existing semi-analytical gravitational
waveform models for spin-aligned coalescing black hole binaries based on the
effective-one-body approach.They are informed by numerical relativity
simulations and provide the relative dynamics and waveforms from early inspiral
to plunge, merge... | [
{
"created": "Mon, 25 Nov 2019 10:33:20 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Nov 2019 13:50:38 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"Rettegno",
"Piero",
""
],
[
"Martinetti",
"Fabio",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Bini",
"Donato",
""
],
[
"Riemenschneider",
"Gunnar",
""
],
[
"Damour",
"Thibault",
""
]
] | TEOBResumS and SEOBNRv4 are the two existing semi-analytical gravitational waveform models for spin-aligned coalescing black hole binaries based on the effective-one-body approach.They are informed by numerical relativity simulations and provide the relative dynamics and waveforms from early inspiral to plunge, merger ... |
1209.1385 | Subhajit Saha | Subhajit Saha and Subenoy Chakraborty | A redefinition of Hawking temperature on the event horizon:
Thermodynamical equilibrium | 10 pages | Physics Letters B 717, 319 (2012) | 10.1016/j.physletb.2012.09.065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we have used the recently introduced redefined Hawking
temperature on the event horizon and investigated whether the generalised
second law of thermodynamics (GSLT) and thermodynamic equilibrium holds for
both the event and the apparent horizons. Here we have considered FRW universe
and examined the G... | [
{
"created": "Thu, 6 Sep 2012 10:37:05 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2012 09:34:51 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Jul 2015 16:58:31 GMT",
"version": "v3"
}
] | 2016-05-04 | [
[
"Saha",
"Subhajit",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this article we have used the recently introduced redefined Hawking temperature on the event horizon and investigated whether the generalised second law of thermodynamics (GSLT) and thermodynamic equilibrium holds for both the event and the apparent horizons. Here we have considered FRW universe and examined the GSL... |
2310.04157 | Andrea Geralico | Davide Astesiano, Donato Bini, Andrea Geralico, Matteo Luca Ruggiero | Particle motion in a rotating dust spacetime: the Bonnor solution | 11 pages, 5 figures (10 eps files); v2: new Section IV added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the geometrical properties, spectral classification,
geodesics, and causal structure of the Bonnor's spacetime [Journal of Physics A
Math. Gen., \textbf{10}, 1673 (1977)], i.e., a stationary axisymmetric solution
with a rotating dust as a source. This spacetime has a directional singularity
at the orig... | [
{
"created": "Fri, 6 Oct 2023 11:11:31 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2024 17:34:12 GMT",
"version": "v2"
}
] | 2024-02-28 | [
[
"Astesiano",
"Davide",
""
],
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Ruggiero",
"Matteo Luca",
""
]
] | We investigate the geometrical properties, spectral classification, geodesics, and causal structure of the Bonnor's spacetime [Journal of Physics A Math. Gen., \textbf{10}, 1673 (1977)], i.e., a stationary axisymmetric solution with a rotating dust as a source. This spacetime has a directional singularity at the origin... |
1702.03626 | Xiangyun Fu fu | Xiangyun Fu and Pengcheng Li | Testing the Distance-Duality Relation from Strong Gravitational Lensing,
Type Ia Supernovae and Gamma-Ray Bursts Data up to redshift $z\sim3.6$ | 18pages and 5figures | null | 10.1142/S0218271817500973 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we perform a cosmological model-independent test of the cosmic
distance-duality relation (CDDR) in terms of the ratio of angular diameter
distance (ADD) $D=D_{\rm A}^{\rm sl}/D_{\rm A}^{\,\rm s}$ from strong
gravitational lensing (SGL) and the ratio of luminosity distance (LD)
$D^\ast=D_{\rm L}^{\,\rm ... | [
{
"created": "Mon, 13 Feb 2017 04:29:11 GMT",
"version": "v1"
}
] | 2017-07-26 | [
[
"Fu",
"Xiangyun",
""
],
[
"Li",
"Pengcheng",
""
]
] | In this paper, we perform a cosmological model-independent test of the cosmic distance-duality relation (CDDR) in terms of the ratio of angular diameter distance (ADD) $D=D_{\rm A}^{\rm sl}/D_{\rm A}^{\,\rm s}$ from strong gravitational lensing (SGL) and the ratio of luminosity distance (LD) $D^\ast=D_{\rm L}^{\,\rm l}... |
gr-qc/0307098 | Christopher J. Fewster | C.J. Fewster and B. Mistry | Quantum Weak Energy Inequalities for the Dirac field in Flat Spacetime | 8 pages, REVTeX4, version to appear in Phys Rev D | Phys.Rev.D68:105010,2003 | 10.1103/PhysRevD.68.105010 | null | gr-qc hep-th | null | Quantum Weak Energy Inequalities (QWEIs) have been established for a variety
of quantum field theories in both flat and curved spacetimes. Dirac fields are
known (by a result of Fewster and Verch) to satisfy QWEIs under very general
circumstances. However this result does not provide an explicit formula for the
QWEI ... | [
{
"created": "Wed, 23 Jul 2003 10:52:18 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Sep 2003 15:00:05 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fewster",
"C. J.",
""
],
[
"Mistry",
"B.",
""
]
] | Quantum Weak Energy Inequalities (QWEIs) have been established for a variety of quantum field theories in both flat and curved spacetimes. Dirac fields are known (by a result of Fewster and Verch) to satisfy QWEIs under very general circumstances. However this result does not provide an explicit formula for the QWEI bo... |
gr-qc/0207023 | Dr. Anirudh Pradhan | Anirudh Pradhan and Aotemshi I | Bulk Viscous Solutions to the Field Equations and the Deceleration
Parameter-Revisited | Latex 15 pages, submitted to IJMPD | Int.J.Mod.Phys.D11:1419-1434,2002 | 10.1142/S0218271802002402 | null | gr-qc | null | We utilise a form for the Hubble parameter to generate a number of solutions
to the Einstein field equations with variable cosmological constant and
variable gravitational constant in the presence of a bulk viscous fluid. The
Hubble law utilised yields a constant value for the deceleration parameter. A
new class of s... | [
{
"created": "Thu, 4 Jul 2002 12:41:49 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Pradhan",
"Anirudh",
""
],
[
"I",
"Aotemshi",
""
]
] | We utilise a form for the Hubble parameter to generate a number of solutions to the Einstein field equations with variable cosmological constant and variable gravitational constant in the presence of a bulk viscous fluid. The Hubble law utilised yields a constant value for the deceleration parameter. A new class of sol... |
1506.08062 | Seyed Hossein Hendi Dr. | Seyed Hossein Hendi and Mir Faizal | Black Holes in Gauss-Bonnet Gravity's Rainbow | 12 pages with 26 figures, Accepted for publication in PRD | Phys. Rev. D 92, 044027 (2015) | 10.1103/PhysRevD.92.044027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will generalize the Gauss-Bonnet gravity to an energy
dependent Gauss-Bonnet theory of gravity, which we shall call as the
Gauss-Bonnet gravity's rainbow. We will also couple this theory to a Maxwell's
theory. We will analyze black hole solutions in this energy dependent
Gauss-Bonnet gravity's rainb... | [
{
"created": "Sat, 20 Jun 2015 12:16:07 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Aug 2015 08:57:34 GMT",
"version": "v2"
}
] | 2015-08-26 | [
[
"Hendi",
"Seyed Hossein",
""
],
[
"Faizal",
"Mir",
""
]
] | In this paper, we will generalize the Gauss-Bonnet gravity to an energy dependent Gauss-Bonnet theory of gravity, which we shall call as the Gauss-Bonnet gravity's rainbow. We will also couple this theory to a Maxwell's theory. We will analyze black hole solutions in this energy dependent Gauss-Bonnet gravity's rainbow... |
1312.0535 | Rafe Mazzeo | James Dilts, James Isenberg, Rafe Mazzeo, Caleb Meier | Non-CMC solutions of the Einstein constraint equations on asymptotically
Euclidean manifolds | 8 pages | null | 10.1088/0264-9381/31/6/065001 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we prove two existence theorems for the Einstein constraint
equations on asymptotically Euclidean manifolds. The first is for arbitrary
mean curvature functions with restrictions on the size of the
transverse-traceless data and the non-gravitational field data, while the
second assumes a near-CMC conditi... | [
{
"created": "Mon, 2 Dec 2013 18:11:05 GMT",
"version": "v1"
}
] | 2014-03-05 | [
[
"Dilts",
"James",
""
],
[
"Isenberg",
"James",
""
],
[
"Mazzeo",
"Rafe",
""
],
[
"Meier",
"Caleb",
""
]
] | In this note we prove two existence theorems for the Einstein constraint equations on asymptotically Euclidean manifolds. The first is for arbitrary mean curvature functions with restrictions on the size of the transverse-traceless data and the non-gravitational field data, while the second assumes a near-CMC condition... |
2108.11144 | Jaume Haro | Jaume de Haro and Llibert Arest\'e Sal\'o | A review of Quintessential Inflation | Invited review in the special issue "Latest Developments in the Quest
for the Unification of Cosmic Inflation and Dark Energy" of Galaxies | null | 10.3390/galaxies9040073 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We compute numerically the reheating temperature due to the gravitational
production of conformally coupled superheavy particles during the phase
transition from the end of inflation to the beginning of kination in two
different Quintessential Inflation (QI) scenarios, namely Lorentzian
Quintessential Inflation (LQI)... | [
{
"created": "Wed, 25 Aug 2021 09:41:33 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2021 16:23:23 GMT",
"version": "v2"
}
] | 2023-01-03 | [
[
"de Haro",
"Jaume",
""
],
[
"Saló",
"Llibert Aresté",
""
]
] | We compute numerically the reheating temperature due to the gravitational production of conformally coupled superheavy particles during the phase transition from the end of inflation to the beginning of kination in two different Quintessential Inflation (QI) scenarios, namely Lorentzian Quintessential Inflation (LQI) a... |
1402.0202 | Bibhas Majhi Ranjan | Wontae Kim, Bibhas Ranjan Majhi | Free-fall energy density and flux in the Schwarzschild black hole | Published version | IJMPA 30, (2015) 1550053 | 10.1142/S0217751X15500530 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the four-dimensional background of Schwarzschild black hole, we
investigate the energy densities and fluxes in the freely falling frames for
the Boulware, Unruh, and Israel-Hartle-Hawking states. In particular, we study
their behaviors near the horizon and asymptotic spatial infinity by using the
trace anomaly of ... | [
{
"created": "Sun, 2 Feb 2014 15:23:09 GMT",
"version": "v1"
},
{
"created": "Sat, 2 May 2015 14:20:04 GMT",
"version": "v2"
}
] | 2015-05-05 | [
[
"Kim",
"Wontae",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | In the four-dimensional background of Schwarzschild black hole, we investigate the energy densities and fluxes in the freely falling frames for the Boulware, Unruh, and Israel-Hartle-Hawking states. In particular, we study their behaviors near the horizon and asymptotic spatial infinity by using the trace anomaly of a ... |
1001.1252 | Hossein Farajollahi | Hossein Farajollahi, Arvin Ravanpak | On the Dynamics of Bianchi IX cosmological models | 11 pages, 1 figure | Int J Theor Phy, 48, 12, 3345-3352, 2009 | 10.1007/s10773-009-0137-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological description of the universe is proposed in the context of
Hamiltonian formulation of a Bianchi IX cosmology minimally coupled to a
massless scalar field. The classical and quantum results are studied with
special attention to the case of closed Friedmann-Robertson-Walker model.
| [
{
"created": "Fri, 8 Jan 2010 12:19:58 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Farajollahi",
"Hossein",
""
],
[
"Ravanpak",
"Arvin",
""
]
] | A cosmological description of the universe is proposed in the context of Hamiltonian formulation of a Bianchi IX cosmology minimally coupled to a massless scalar field. The classical and quantum results are studied with special attention to the case of closed Friedmann-Robertson-Walker model. |
gr-qc/0011007 | Sawa Manoff | Sawa Manoff | Conformal derivative and conformal transports over spaces with
contravariant and covariant affine connections and metrics | 17 pages, LaTeX | Int.J.Mod.Phys. A15 (2000) 679-695 | 10.1142/S0217751X00000343 | null | gr-qc | null | Transports preserving the angle between two contravariant vector fields but
changing their lengths proportional to their own lengths are introduced as
''conformal'' transports and investigated over spaces with contravariant and
covariant affine connections (whose components differ not only by sign) and
metrics. They ... | [
{
"created": "Fri, 3 Nov 2000 07:39:07 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Manoff",
"Sawa",
""
]
] | Transports preserving the angle between two contravariant vector fields but changing their lengths proportional to their own lengths are introduced as ''conformal'' transports and investigated over spaces with contravariant and covariant affine connections (whose components differ not only by sign) and metrics. They ar... |
gr-qc/9404025 | null | A. Casher and F. Englert | Entropy Generation in Quantum Gravity and Black Hole Remnants | 26 pages, ULB-TH 7/93 6 figures not included available on request
from F. E. Published in ``String Theory, Quantum Gravity and the Unification
of the Fundamental Interactions'', World Scientific 1993, and to be published
in the ``International Conference on Fundamental Aspects of Quantum Theory''
in Honor of Y.... | null | null | null | gr-qc hep-th | null | The area entropy $A/4$ and the related Hawking temperature in the presence of
event horizons are rederived, for de Sitter and black hole topologies, as a
consequence of a tunneling of the wave functional associated to the classical
coupled matter and gravitational fields. The extension of the wave functional
outside ... | [
{
"created": "Wed, 13 Apr 1994 13:43:09 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 1994 13:03:31 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Casher",
"A.",
""
],
[
"Englert",
"F.",
""
]
] | The area entropy $A/4$ and the related Hawking temperature in the presence of event horizons are rederived, for de Sitter and black hole topologies, as a consequence of a tunneling of the wave functional associated to the classical coupled matter and gravitational fields. The extension of the wave functional outside th... |
1602.05071 | Erico Goulart | E. Goulart | Nonlinear electrodynamics is skilled with knots | 5 pages, 1 figure | null | 10.1209/0295-5075/115/10004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aims of this letter are three-fold: First is to show that nonlinear
generalizations of electrodynamics support various types of knotted solutions
in vacuum. The solutions are universal in the sense that they do not depend on
the specific Lagrangian density, at least if the latter gives rise to a
well-posed theory... | [
{
"created": "Tue, 16 Feb 2016 16:11:24 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Goulart",
"E.",
""
]
] | The aims of this letter are three-fold: First is to show that nonlinear generalizations of electrodynamics support various types of knotted solutions in vacuum. The solutions are universal in the sense that they do not depend on the specific Lagrangian density, at least if the latter gives rise to a well-posed theory. ... |
1604.03543 | Pierre Fleury | Pierre Fleury | On the time delay between ultra-relativistic particles | 5 pages, 1 figure, v2 matches published version | Physics Letters B 760 (2016) 350-353 | 10.1016/j.physletb.2016.07.010 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The time delay between the receptions of ultra-relativistic particles emitted
simultaneously is a useful observable for both fundamental physics and
cosmology. The expression of the delay when the particles travel through an
arbitrary spacetime has been derived recently by Fanizza et al., using a
particular coordinat... | [
{
"created": "Tue, 12 Apr 2016 19:55:12 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Jul 2016 10:46:33 GMT",
"version": "v2"
}
] | 2016-07-19 | [
[
"Fleury",
"Pierre",
""
]
] | The time delay between the receptions of ultra-relativistic particles emitted simultaneously is a useful observable for both fundamental physics and cosmology. The expression of the delay when the particles travel through an arbitrary spacetime has been derived recently by Fanizza et al., using a particular coordinate ... |
1408.6561 | S. I. Kruglov | S. I. Kruglov | Black hole emission of vector particles in (1+1) dimensions | 13 pages, 2 figures | Int. J. Mod. Phys. A Vol. 29 (2014), 1450118 | 10.1142/S0217751X14501188 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the radiation of spin-1 particles by black holes in (1+1)
dimensions within the Proca equation. The process is considered as quantum
tunnelling of bosons through an event horizon. It is shown that the emission
temperature for the Schwarzschild background geometry is the same as the
Hawking temperature ... | [
{
"created": "Wed, 13 Aug 2014 00:17:46 GMT",
"version": "v1"
}
] | 2014-08-29 | [
[
"Kruglov",
"S. I.",
""
]
] | We investigate the radiation of spin-1 particles by black holes in (1+1) dimensions within the Proca equation. The process is considered as quantum tunnelling of bosons through an event horizon. It is shown that the emission temperature for the Schwarzschild background geometry is the same as the Hawking temperature co... |
2205.12195 | Pisin Chen | AnaBHEL Collaboration: Pisin Chen, Gerard Mourou, Marc Besancon, Yuji
Fukuda, Jean-Francois Glicenstein, Jiwoo Nam, Ching-En Lin, Kuan-Nan Lin,
Shu-Xiao Liu, Yung-Kun Liu, Masaki Kando, Kotaro Kondo, Stathes Paganis,
Alexander Pirozhkov, Hideaki Takabe, Boris Tuchming, Wei-Po Wang, Naoki
Watamura, Jonathan Whee... | AnaBHEL (Analog Black Hole Evaporation via Lasers) Experiment: Concept,
Design, and Status | 18 pages, 26 figures | null | null | null | gr-qc hep-ex physics.optics physics.plasm-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | Accelerating relativistic mirror has long been recognized as a viable setting
where the physics mimics that of black hole Hawking radiation. In 2017, Chen
and Mourou proposed a novel method to realize such a system by traversing an
ultra-intense laser through a plasma target with a decreasing density. An
internationa... | [
{
"created": "Tue, 24 May 2022 16:49:43 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2022 16:53:48 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jun 2022 14:52:05 GMT",
"version": "v3"
}
] | 2022-06-13 | [
[
"AnaBHEL Collaboration",
"",
""
],
[
"Chen",
"Pisin",
""
],
[
"Mourou",
"Gerard",
""
],
[
"Besancon",
"Marc",
""
],
[
"Fukuda",
"Yuji",
""
],
[
"Glicenstein",
"Jean-Francois",
""
],
[
"Nam",
"Jiwoo",
""
]... | Accelerating relativistic mirror has long been recognized as a viable setting where the physics mimics that of black hole Hawking radiation. In 2017, Chen and Mourou proposed a novel method to realize such a system by traversing an ultra-intense laser through a plasma target with a decreasing density. An international ... |
1711.04933 | Francisco Turrubiates Dr. | Ruben Cordero, Hugo Garcia-Compean and Francisco J. Turrubiates | A phase space description of the FLRW quantum cosmology in Ho$\check{\rm
r}$ava-Lifshitz type gravity | 34 pages, 18 figures (Figures, comments and references added. Typos
corrected) | General Relativity and Gravitation (2019) 51:138 | 10.1007/s10714-019-2627-x | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum cosmology of the Friedmann-Lema\^{i}tre-Robertson-Walker model with
cosmological constant in the Ho$\check{\rm r}$ava-Lifshitz type gravity is
studied in the phase space by means of the Wigner function. The modification of
the usual general relativity description by the Ho$\check{\rm r}$ava-Lifshitz
type grav... | [
{
"created": "Tue, 14 Nov 2017 03:44:10 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Jul 2019 05:59:04 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Nov 2019 07:09:36 GMT",
"version": "v3"
}
] | 2019-11-05 | [
[
"Cordero",
"Ruben",
""
],
[
"Garcia-Compean",
"Hugo",
""
],
[
"Turrubiates",
"Francisco J.",
""
]
] | Quantum cosmology of the Friedmann-Lema\^{i}tre-Robertson-Walker model with cosmological constant in the Ho$\check{\rm r}$ava-Lifshitz type gravity is studied in the phase space by means of the Wigner function. The modification of the usual general relativity description by the Ho$\check{\rm r}$ava-Lifshitz type gravit... |
1408.5264 | Andrea Geralico | Donato Bini, Mariateresa Crosta, Fernando de Felice, Andrea Geralico,
Alberto Vecchiato | The Erez-Rosen metric and the role of the quadrupole on light
propagation | 24 pages, 8 figures; published version | Class. Quantum Grav. 30, 045009 (2013) | 10.1088/0264-9381/30/4/045009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational field of a static body with quadrupole moment is described
by an exact solution found by Erez and Rosen. Here we investigate the role of
the quadrupole in the motion, deflection and lensing of a light ray in the
above metric. The standard lensing observables like image positions and
magnification ha... | [
{
"created": "Fri, 22 Aug 2014 11:00:17 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Crosta",
"Mariateresa",
""
],
[
"de Felice",
"Fernando",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Vecchiato",
"Alberto",
""
]
] | The gravitational field of a static body with quadrupole moment is described by an exact solution found by Erez and Rosen. Here we investigate the role of the quadrupole in the motion, deflection and lensing of a light ray in the above metric. The standard lensing observables like image positions and magnification have... |
2406.18205 | Philip Semr\'en | Philip Semr\'en | Cosmological Particle Creation Using an Equal-Time Wigner Formalism | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the expansion of the universe can create particles.
However, due to ambiguities when defining particles during the expansion, there
are still debates about how to choose vacuum and particle states. To clarify
how particles are produced in an expanding universe, we study the creation of
real scal... | [
{
"created": "Wed, 26 Jun 2024 09:37:36 GMT",
"version": "v1"
}
] | 2024-06-27 | [
[
"Semrén",
"Philip",
""
]
] | It is well known that the expansion of the universe can create particles. However, due to ambiguities when defining particles during the expansion, there are still debates about how to choose vacuum and particle states. To clarify how particles are produced in an expanding universe, we study the creation of real scalar... |
1708.08004 | Tiberiu Harko | Juntong Su, Tiberiu Harko, Shi-Dong Liang | Irreversible thermodynamic description of dark matter and radiation
creation during inflationary reheating | 23 pages, 8 figures, accepted for publication in Advances in High
Energy Physics | Advances in High Energy Physics, Volume 2017, Article ID 7650238
(2017) | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the matter creation processes during the reheating period at
the end of inflation in the early Universe, by using the irreversible
thermodynamic of open systems. The matter content of the Universe is assumed to
consist of the inflationary scalar field, which, through its decay, generates
relativistic m... | [
{
"created": "Sat, 26 Aug 2017 18:14:26 GMT",
"version": "v1"
}
] | 2018-10-09 | [
[
"Su",
"Juntong",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Liang",
"Shi-Dong",
""
]
] | We investigate the matter creation processes during the reheating period at the end of inflation in the early Universe, by using the irreversible thermodynamic of open systems. The matter content of the Universe is assumed to consist of the inflationary scalar field, which, through its decay, generates relativistic mat... |
1406.5224 | Stephen Taylor | Stephen Taylor, Justin Ellis, Jonathan Gair | Accelerated Bayesian model-selection and parameter-estimation in
continuous gravitational-wave searches with pulsar-timing arrays | 17 pages, 10 figures, 1 table. Minor changes to reflect published
version | Phys. Rev. D 90, 104028 (2014) | 10.1103/PhysRevD.90.104028 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe several new techniques which accelerate Bayesian searches for
continuous gravitational-wave emission from supermassive black-hole binaries
using pulsar timing arrays. These techniques mitigate the problematic increase
of search-dimensionality with the size of the pulsar array which arises from
having to i... | [
{
"created": "Thu, 19 Jun 2014 21:40:47 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Nov 2014 23:25:54 GMT",
"version": "v2"
}
] | 2014-11-25 | [
[
"Taylor",
"Stephen",
""
],
[
"Ellis",
"Justin",
""
],
[
"Gair",
"Jonathan",
""
]
] | We describe several new techniques which accelerate Bayesian searches for continuous gravitational-wave emission from supermassive black-hole binaries using pulsar timing arrays. These techniques mitigate the problematic increase of search-dimensionality with the size of the pulsar array which arises from having to inc... |
1108.6301 | Dawood Kothawala Dr. | Dawood Kothawala | Box of Ideal Gas in Free Fall | 5 pages, no figures; abstract abridged and an appendix added
outlining some relevant mathematical steps; accepted in Phys. Lett. B | Phys. Lett. B 720: 410-413 (2013) | 10.1016/j.physletb.2013.02.035 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the \textit{quantum} partition function of non-relativistic, ideal
gas in a (non-cubical) box falling freely in arbitrary curved spacetime with
centre 4-velocity u^a. When perturbed energy eigenvalues are properly taken
into account, we find that corrections to various thermodynamic quantities
include a very... | [
{
"created": "Wed, 31 Aug 2011 17:54:22 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2013 11:23:37 GMT",
"version": "v2"
}
] | 2013-03-12 | [
[
"Kothawala",
"Dawood",
""
]
] | We study the \textit{quantum} partition function of non-relativistic, ideal gas in a (non-cubical) box falling freely in arbitrary curved spacetime with centre 4-velocity u^a. When perturbed energy eigenvalues are properly taken into account, we find that corrections to various thermodynamic quantities include a very s... |
gr-qc/0305080 | Thomas Thiemann | Thomas Thiemann | The Phoenix Project: Master Constraint Programme for Loop Quantum
Gravity | LATEX, uses AMSTEX | Class.Quant.Grav.23:2211-2248,2006 | 10.1088/0264-9381/23/7/002 | AEI-2003-047, PI-2003-003 | gr-qc hep-th math-ph math.MP quant-ph | null | The Hamiltonian constraint remains the major unsolved problem in Loop Quantum
Gravity (LQG). Seven years ago a mathematically consistent candidate
Hamiltonian constraint has been proposed but there are still several unsettled
questions which concern the algebra of commutators among smeared Hamiltonian
constraints whi... | [
{
"created": "Wed, 21 May 2003 16:07:14 GMT",
"version": "v1"
}
] | 2011-07-18 | [
[
"Thiemann",
"Thomas",
""
]
] | The Hamiltonian constraint remains the major unsolved problem in Loop Quantum Gravity (LQG). Seven years ago a mathematically consistent candidate Hamiltonian constraint has been proposed but there are still several unsettled questions which concern the algebra of commutators among smeared Hamiltonian constraints which... |
1605.08976 | Saheb Soroushfar | Saheb Soroushfar, Reza Saffari, Sobhan Kazempour, Saskia Grunau, Jutta
Kunz | Detailed study of geodesics in the Kerr-Newman-(A)dS spactime and the
rotating charged black hole spacetime in $f(R)$ gravity | 35 pages,3 table,24 figures, Accepted for publication in Physical
Review D. arXiv admin note: text overlap with arXiv:1605.08975,
arXiv:1601.03143 | Phys. Rev. D 94, 024052 (2016) | 10.1103/PhysRevD.94.024052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a detailed study of the geodesic equations in the spacetime of the
static and rotating charged black hole corresponding to the Kerr-Newman-(A)dS
spacetime. We derive the equations of motion for test particles and light rays
and present their solutions in terms of the Weierstrass $\wp$, $\zeta$ and
$\sigma$... | [
{
"created": "Sun, 29 May 2016 08:11:58 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2016 10:49:04 GMT",
"version": "v2"
}
] | 2016-08-02 | [
[
"Soroushfar",
"Saheb",
""
],
[
"Saffari",
"Reza",
""
],
[
"Kazempour",
"Sobhan",
""
],
[
"Grunau",
"Saskia",
""
],
[
"Kunz",
"Jutta",
""
]
] | We perform a detailed study of the geodesic equations in the spacetime of the static and rotating charged black hole corresponding to the Kerr-Newman-(A)dS spacetime. We derive the equations of motion for test particles and light rays and present their solutions in terms of the Weierstrass $\wp$, $\zeta$ and $\sigma$ f... |
gr-qc/9701036 | William Krivan | W. Krivan, P. Laguna, P. Papadopoulos | Dynamics of spin-2 fields in Kerr background geometries | 3 pages LaTeX using sprocl.sty, 1 figure, to appear in: Proceedings
of the 18th Texas Symposium on Relativistic Astrophysics (eds Olinto, Frieman
and Schramm, World Scientific) | null | null | null | gr-qc | null | We have developed a numerical method for evolving perturbations of rotating
black holes. Solutions are obtained by integrating the Teukolsky equation
written as a first-order in time, coupled system of equations, in a form that
explicitly exhibits the radial characteristic directions. We follow the
propagation of gen... | [
{
"created": "Wed, 15 Jan 1997 16:14:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krivan",
"W.",
""
],
[
"Laguna",
"P.",
""
],
[
"Papadopoulos",
"P.",
""
]
] | We have developed a numerical method for evolving perturbations of rotating black holes. Solutions are obtained by integrating the Teukolsky equation written as a first-order in time, coupled system of equations, in a form that explicitly exhibits the radial characteristic directions. We follow the propagation of gener... |
2308.05291 | Caiyu Liu | Caiyu Liu, Xin Wu | Effects of coupling constants on chaos of charged particles in the
$Einstein-\AE$ ther theory | 19 pages, 10 figures | null | 10.3390/universe9080365 | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | There are two free coupling parameters $c_{13}$ and $c_{14}$ in the
Einstein-\AE ther metric describing a non-rotating black hole. This metric is
the Reissner-Nordstr\"{o}m black hole solution when $0\leq 2c_{13}<c_{14}<2$,
but it is not for $0\leq c_{14}<2c_{13}<2$. When the black hole is immersed in
an external asy... | [
{
"created": "Thu, 10 Aug 2023 02:13:42 GMT",
"version": "v1"
}
] | 2023-08-11 | [
[
"Liu",
"Caiyu",
""
],
[
"Wu",
"Xin",
""
]
] | There are two free coupling parameters $c_{13}$ and $c_{14}$ in the Einstein-\AE ther metric describing a non-rotating black hole. This metric is the Reissner-Nordstr\"{o}m black hole solution when $0\leq 2c_{13}<c_{14}<2$, but it is not for $0\leq c_{14}<2c_{13}<2$. When the black hole is immersed in an external asymp... |
gr-qc/0504116 | Wei-Tou Ni | Wei-Tou Ni | Empirical Foundations of Relativistic Gravity | 18 pages; International Journal of Modern Physics D, in press (World
Scientific, 2005); 100 Years of Gravity and Accelerated Frames--The Deepest
Insights of Einstein and Yang-Mills (Ed. J. P. Hsu and D. Fine, in press,
World Scientific, 2005) | Int.J.Mod.Phys.D14:901-922,2005 | 10.1142/S0218271805007139 | PMO-A-025 | gr-qc astro-ph hep-ph | null | In 1859, Le Verrier discovered the mercury perihelion advance anomaly. This
anomaly turned out to be the first relativistic-gravity effect observed. During
the 141 years to 2000, the precisions of laboratory and space experiments, and
astrophysical and cosmological observations on relativistic gravity have been
impro... | [
{
"created": "Sun, 24 Apr 2005 06:22:21 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Ni",
"Wei-Tou",
""
]
] | In 1859, Le Verrier discovered the mercury perihelion advance anomaly. This anomaly turned out to be the first relativistic-gravity effect observed. During the 141 years to 2000, the precisions of laboratory and space experiments, and astrophysical and cosmological observations on relativistic gravity have been improve... |
1707.07675 | Ra\'ila Andr\'e | Ra\'ila Andr\'e and Gilberto M. Kremer | Stellar structure model in hydrostatic equilibrium in the context of
$f(\mathcal{R})$-gravity | 8 pages, 1 figure Manuscript accepted for publication in Research in
Astronomy and Astrophysics | null | null | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present a stellar structure model from
$f(\mathcal{R})$-gravity point of view capable to describe some classes of
stars (White Dwarfs, Brown Dwarfs, Neutron stars, Red Giants and the Sun). This
model was based on $f(\mathcal{R})$-gravity field equations for
$f(\mathcal{R})= \mathcal{R}+ f_2 \mathcal{R... | [
{
"created": "Mon, 24 Jul 2017 10:21:17 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Aug 2017 10:59:04 GMT",
"version": "v2"
}
] | 2017-08-30 | [
[
"André",
"Raíla",
""
],
[
"Kremer",
"Gilberto M.",
""
]
] | In this work we present a stellar structure model from $f(\mathcal{R})$-gravity point of view capable to describe some classes of stars (White Dwarfs, Brown Dwarfs, Neutron stars, Red Giants and the Sun). This model was based on $f(\mathcal{R})$-gravity field equations for $f(\mathcal{R})= \mathcal{R}+ f_2 \mathcal{R}^... |
gr-qc/0309073 | Maria J. Pareja | M. J. Pareja | Relativistic stars in differential rotation: bounds on the dragging rate
and on the rotational energy | 23 pages, no figures, LaTeX. Submitted to J. Math. Phys | J.Math.Phys. 45 (2004) 677-695 | 10.1063/1.1636515 | null | gr-qc | null | For general relativistic equilibrium stellar models (stationary axisymmetric
asymptotically flat and convection-free) with differential rotation, it is
shown that for a wide class of rotation laws the distribution of angular
velocity of the fluid has a sign, say "positive", and then both the dragging
rate and the ang... | [
{
"created": "Tue, 16 Sep 2003 07:42:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pareja",
"M. J.",
""
]
] | For general relativistic equilibrium stellar models (stationary axisymmetric asymptotically flat and convection-free) with differential rotation, it is shown that for a wide class of rotation laws the distribution of angular velocity of the fluid has a sign, say "positive", and then both the dragging rate and the angul... |
1209.5081 | Robert Milson | Robert Milson, David McNutt, Alan Coley | Invariant classification of vacuum PP-waves | null | null | 10.1063/1.4791691 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve the equivalence problem for vacuum PP-wave spacetimes by employing
the Karlhede algorithm. Our main result is a suite of Cartan invariants that
allows for the complete invariant classification of the vacuum pp-waves. In
particular, we derive the invariant characterization of the G2 and G3
sub-classes in term... | [
{
"created": "Sun, 23 Sep 2012 16:15:09 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Milson",
"Robert",
""
],
[
"McNutt",
"David",
""
],
[
"Coley",
"Alan",
""
]
] | We solve the equivalence problem for vacuum PP-wave spacetimes by employing the Karlhede algorithm. Our main result is a suite of Cartan invariants that allows for the complete invariant classification of the vacuum pp-waves. In particular, we derive the invariant characterization of the G2 and G3 sub-classes in terms ... |
gr-qc/0002019 | Stefano Liberati | S. Liberati, T. Rothman, S. Sonego | Nonthermal nature of incipient extremal black holes | 13 pages, 2 epsf figures, RevTeX 3. Minor changes, version published
in PRD | Phys.Rev. D62 (2000) 024005 | 10.1103/PhysRevD.62.024005 | SISSA-Ref. 8/2000/A | gr-qc | null | We examine particle production from spherical bodies collapsing into extremal
Reissner-Nordstr\"om black holes. Kruskal coordinates become ill-defined in the
extremal case, but we are able to find a simple generalization of them that is
good in this limit. The extension allows us to calculate the late-time
worldline ... | [
{
"created": "Thu, 3 Feb 2000 17:50:36 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jul 2000 17:05:36 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Liberati",
"S.",
""
],
[
"Rothman",
"T.",
""
],
[
"Sonego",
"S.",
""
]
] | We examine particle production from spherical bodies collapsing into extremal Reissner-Nordstr\"om black holes. Kruskal coordinates become ill-defined in the extremal case, but we are able to find a simple generalization of them that is good in this limit. The extension allows us to calculate the late-time worldline of... |
2307.15147 | Edisom S. Moreira Jr. | E. S. Moreira Jr | Boundary effects on the thermal stability of a black hole at the centre
of a conducting spherical shell | 10 pages, no figures. This version, except for stylistic changes,
fits with the published version in PRD | Phys. Rev. D 108, 105018 (2023) | 10.1103/PhysRevD.108.105018 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | This paper reports calculations and analysis of the effects of a perfect
conducting wall of a very large spherical shell on the stable thermodynamic
equilibrium of a black hole sitting at the centre of the shell which is filled
with Electromagnetic blackbody radiation. A parallel is drawn with the case
where electrom... | [
{
"created": "Thu, 27 Jul 2023 18:48:25 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2023 11:36:31 GMT",
"version": "v2"
}
] | 2023-12-01 | [
[
"Moreira",
"E. S.",
"Jr"
]
] | This paper reports calculations and analysis of the effects of a perfect conducting wall of a very large spherical shell on the stable thermodynamic equilibrium of a black hole sitting at the centre of the shell which is filled with Electromagnetic blackbody radiation. A parallel is drawn with the case where electromag... |
gr-qc/0411078 | Michael P\"urrer | Michael P\"urrer, Sascha Husa, Peter C. Aichelburg | News from Critical Collapse: Bondi Mass, Tails and Quasinormal Modes | 17 pages, 13 figures, uses RevTeX4, changed order of figures and
corrected references to match PRD version | Phys.Rev.D71:104005,2005 | 10.1103/PhysRevD.71.104005 | UWThPh-2004-33 | gr-qc | null | We discuss critical gravitational collapse on the threshold of apparent
horizon formation as a model both for the discussion of global aspects of
critical collapse and for numerical studies in a compactified context. For our
matter model we choose a self-gravitating massless scalar field in spherical
symmetry, which ... | [
{
"created": "Mon, 15 Nov 2004 22:40:34 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2005 15:11:32 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Pürrer",
"Michael",
""
],
[
"Husa",
"Sascha",
""
],
[
"Aichelburg",
"Peter C.",
""
]
] | We discuss critical gravitational collapse on the threshold of apparent horizon formation as a model both for the discussion of global aspects of critical collapse and for numerical studies in a compactified context. For our matter model we choose a self-gravitating massless scalar field in spherical symmetry, which ha... |
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