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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1710.10638 | Mariam Bouhmadi-Lopez | Che-Yu Chen, Mariam Bouhmadi-L\'opez, Pisin Chen | Black hole solutions in mimetic Born-Infeld gravity | 9 pages, 5 figures, RevTex4 | Eur. Phys. J. C (2018) 78:59 | 10.1140/epjc/s10052-018-5556-z | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The vacuum, static, and spherically symmetric solutions in the mimetic
Born-Infeld gravity are studied. The mimetic Born-Infeld gravity is a
reformulation of the Eddington-inspired-Born-Infeld (EiBI) model under the
mimetic approach. Due to the mimetic field, the theory contains non-trivial
vacuum solutions different... | [
{
"created": "Sun, 29 Oct 2017 16:14:12 GMT",
"version": "v1"
}
] | 2018-01-26 | [
[
"Chen",
"Che-Yu",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Chen",
"Pisin",
""
]
] | The vacuum, static, and spherically symmetric solutions in the mimetic Born-Infeld gravity are studied. The mimetic Born-Infeld gravity is a reformulation of the Eddington-inspired-Born-Infeld (EiBI) model under the mimetic approach. Due to the mimetic field, the theory contains non-trivial vacuum solutions different f... |
2309.07269 | Leandro Lessa | L. A. Lessa, J. E. G. Silva | Einstein-Bumblebee-Dilaton black hole in Lifshitz spacetimes | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the critical behavior of Lifshitz black holes in
Einstein-dilaton gravity in the context of spontaneous Lorentz symmetry
breaking. Considering the effects of both the bumblebee vacuum expectation
value (VEV) and the fluctuations over the VEV, we obtained new asymptotically
Lifshitz charged solutions in... | [
{
"created": "Wed, 13 Sep 2023 19:20:01 GMT",
"version": "v1"
}
] | 2023-09-15 | [
[
"Lessa",
"L. A.",
""
],
[
"Silva",
"J. E. G.",
""
]
] | We investigate the critical behavior of Lifshitz black holes in Einstein-dilaton gravity in the context of spontaneous Lorentz symmetry breaking. Considering the effects of both the bumblebee vacuum expectation value (VEV) and the fluctuations over the VEV, we obtained new asymptotically Lifshitz charged solutions in (... |
gr-qc/9906015 | Thomas Buchert | Thomas Buchert | On average properties of inhomogeneous fluids in general relativity I:
dust cosmologies | TeX 19 pages, matches published version in G.R.G | Gen.Rel.Grav. 32 (2000) 105-125 | 10.1023/A:1001800617177 | null | gr-qc astro-ph | null | For general relativistic spacetimes filled with irrotational `dust' a
generalized form of Friedmann's equations for an `effective' expansion factor
$a_D (t)$ of inhomogeneous cosmologies is derived. Contrary to the standard
Friedmann equations, which hold for homogeneous-isotropic cosmologies, the new
equations inclu... | [
{
"created": "Fri, 4 Jun 1999 12:50:15 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Dec 1999 12:14:13 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Buchert",
"Thomas",
""
]
] | For general relativistic spacetimes filled with irrotational `dust' a generalized form of Friedmann's equations for an `effective' expansion factor $a_D (t)$ of inhomogeneous cosmologies is derived. Contrary to the standard Friedmann equations, which hold for homogeneous-isotropic cosmologies, the new equations include... |
1301.0224 | Mir Faizal | Mir Faizal | Absence of Black Holes Information Paradox in Group Field Cosmology | 7 pages, 0 figures, accepted for publication in Int. J. Geom. Meth.
Mod. Phys | Int. J. Geom. Meth. Mod. Phys. 11: 1450010, 2014 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we will analyse the black hole information paradox in group
field cosmology. We will first construct a group field cosmology with third
quantized gauge symmetry. Then we will argue that that in this group field
cosmology the process that change the topology of spacetime are unitarity
process. Thus, the ... | [
{
"created": "Wed, 2 Jan 2013 12:56:06 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2013 17:30:42 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Sep 2013 01:20:23 GMT",
"version": "v3"
}
] | 2014-02-26 | [
[
"Faizal",
"Mir",
""
]
] | In this paper we will analyse the black hole information paradox in group field cosmology. We will first construct a group field cosmology with third quantized gauge symmetry. Then we will argue that that in this group field cosmology the process that change the topology of spacetime are unitarity process. Thus, the in... |
1605.08786 | Yi-Zen Chu | Yi-Zen Chu and Vitaly Vanchurin | Ideal MHD(-Einstein) Solutions Obeying The Force-Free Condition | 12 pages. The Mathematica package TensoriaCalc used in this paper, as
well as its accompanying MHDSystem Guide, can be found at
http://www.stargazing.net/yizen/MHD.html | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find two families of analytic solutions to the ideal magnetohydrodynamics
(iMHD) equations, in a class of 4-dimensional (4D) curved spacetimes. The
plasma current is null, and as a result, the stress-energy tensor of the plasma
itself can be chosen to take a cosmological-constant-like form. Despite the
presence of... | [
{
"created": "Fri, 27 May 2016 20:00:06 GMT",
"version": "v1"
}
] | 2016-05-31 | [
[
"Chu",
"Yi-Zen",
""
],
[
"Vanchurin",
"Vitaly",
""
]
] | We find two families of analytic solutions to the ideal magnetohydrodynamics (iMHD) equations, in a class of 4-dimensional (4D) curved spacetimes. The plasma current is null, and as a result, the stress-energy tensor of the plasma itself can be chosen to take a cosmological-constant-like form. Despite the presence of a... |
gr-qc/9405030 | null | J.N. Goldberg and D.C. Robinson | Linearized Constraints in the Connection Representation: Hamilton-Jacobi
Solution | 16 pages Plain Tex | Phys.Rev.D50:6338-6343,1994 | 10.1103/PhysRevD.50.6338 | null | gr-qc | null | Newman and Rovelli have used singular Hamilton-Jacobi transformations to
reduce the phase space of general relativity in terms of the Ashtekar
variables. Their solution of the gauge constraint cannot be inverted and indeed
has no Minkowski space limit. Nonetheless, we exhibit an explicit
Hamilton-Jacobi solution of a... | [
{
"created": "Wed, 11 May 1994 22:28:58 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Goldberg",
"J. N.",
""
],
[
"Robinson",
"D. C.",
""
]
] | Newman and Rovelli have used singular Hamilton-Jacobi transformations to reduce the phase space of general relativity in terms of the Ashtekar variables. Their solution of the gauge constraint cannot be inverted and indeed has no Minkowski space limit. Nonetheless, we exhibit an explicit Hamilton-Jacobi solution of all... |
1812.09331 | Joshua Cooperman | Joshua H. Cooperman, Manuchehr Dorghabekov | Setting the physical scale of dimensional reduction in causal dynamical
triangulations | 10 pages, 9 figures, 1 table; clarifications in the conclusion
section | Phys. Rev. D 100, 026014 (2019) | 10.1103/PhysRevD.100.026014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the causal dynamical triangulations approach to the quantization of
gravity, striking evidence has emerged for the dynamical reduction of spacetime
dimension on sufficiently small scales. Specifically, the spectral dimension
decreases from the topological value of 4 towards a value near 2 as the scale
being pr... | [
{
"created": "Fri, 21 Dec 2018 19:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2019 19:17:17 GMT",
"version": "v2"
}
] | 2019-07-31 | [
[
"Cooperman",
"Joshua H.",
""
],
[
"Dorghabekov",
"Manuchehr",
""
]
] | Within the causal dynamical triangulations approach to the quantization of gravity, striking evidence has emerged for the dynamical reduction of spacetime dimension on sufficiently small scales. Specifically, the spectral dimension decreases from the topological value of 4 towards a value near 2 as the scale being prob... |
1606.03271 | Julien Grain | J. Grain | The perturbed universe in the deformed algebra approach of Loop Quantum
Cosmology | Invited paper for a special issue of IJMPD on Loop Quantum Cosmology | null | 10.1142/S0218271816420037 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop quantum cosmology is a tentative approach to model the universe down to
the Planck era where quantum gravity settings are needed. The quantization of
the universe as a dynamical space-time is inspired by Loop Quantum Gravity
ideas. In addition, loop quantum cosmology could bridge contact with
astronomical observ... | [
{
"created": "Fri, 10 Jun 2016 11:07:59 GMT",
"version": "v1"
}
] | 2016-08-03 | [
[
"Grain",
"J.",
""
]
] | Loop quantum cosmology is a tentative approach to model the universe down to the Planck era where quantum gravity settings are needed. The quantization of the universe as a dynamical space-time is inspired by Loop Quantum Gravity ideas. In addition, loop quantum cosmology could bridge contact with astronomical observat... |
gr-qc/0102108 | Ioannis Raptis | Ioannis Raptis | Finitary Spacetime Sheaves | null | Int.J.Theor.Phys. 39 (2000) 1233 | null | null | gr-qc | null | The notion of finitary spacetime sheaves is introduced based on locally
finite approximations of the continuous topology of a bounded region of a
spacetime manifold. Finitary spacetime sheaves are seen to be sound
mathematical models of approximations of continuous spacetime observables.
| [
{
"created": "Tue, 27 Feb 2001 15:09:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Raptis",
"Ioannis",
""
]
] | The notion of finitary spacetime sheaves is introduced based on locally finite approximations of the continuous topology of a bounded region of a spacetime manifold. Finitary spacetime sheaves are seen to be sound mathematical models of approximations of continuous spacetime observables. |
1409.2322 | Thiago R.P.Caram\^es | Thiago R. P. Caram\^es, Mahamadou H. Daouda, J\'ulio C. Fabris,
Adriano M. de Oliveira, Oliver F. Piattella, and Vladimir Strokov | The Brans-Dicke-Rastall theory | 17 pages, 3 figures | Eur. Phys. J. C74 (2014) 3145 | 10.1140/epjc/s10052-014-3145-3 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate a theory combining the principles of a scalar-tensor gravity and
Rastall's proposal of a violation of the usual conservation laws. We obtain a
scalar-tensor theory with two parameters $\omega$ and $\lambda$, the latter
quantifying the violation of the usual conservation laws. The only exact
spherically s... | [
{
"created": "Mon, 8 Sep 2014 12:35:16 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 2014 22:23:50 GMT",
"version": "v2"
}
] | 2014-11-27 | [
[
"Caramês",
"Thiago R. P.",
""
],
[
"Daouda",
"Mahamadou H.",
""
],
[
"Fabris",
"Júlio C.",
""
],
[
"de Oliveira",
"Adriano M.",
""
],
[
"Piattella",
"Oliver F.",
""
],
[
"Strokov",
"Vladimir",
""
]
] | We formulate a theory combining the principles of a scalar-tensor gravity and Rastall's proposal of a violation of the usual conservation laws. We obtain a scalar-tensor theory with two parameters $\omega$ and $\lambda$, the latter quantifying the violation of the usual conservation laws. The only exact spherically sym... |
1212.0454 | Sabine Hossenfelder | Sabine Hossenfelder | Gravity can be neither classical nor quantized | 7 pages, third prize in the 2012 FQXi essay contest "Which of our
basic physical assumptions are wrong?" | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I argue that it is possible for a theory to be neither quantized nor
classical. We should therefore give up the assumption that the fundamental
theory which describes gravity at shortest distances must either be quantized,
or quantization must emerge from a fundamentally classical theory. To
illustrate my point I wil... | [
{
"created": "Mon, 3 Dec 2012 17:16:46 GMT",
"version": "v1"
}
] | 2012-12-04 | [
[
"Hossenfelder",
"Sabine",
""
]
] | I argue that it is possible for a theory to be neither quantized nor classical. We should therefore give up the assumption that the fundamental theory which describes gravity at shortest distances must either be quantized, or quantization must emerge from a fundamentally classical theory. To illustrate my point I will ... |
gr-qc/9705007 | Robert Mann | R.B. Mann | Black Holes of Negative Mass | 5 pages, harvmac | Class.Quant.Grav. 14 (1997) 2927-2930 | 10.1088/0264-9381/14/10/018 | WATPHYS-TH96/03 | gr-qc | null | I demonstrate that, under certain circumstances, regions of negative energy
density can undergo gravitational collapse into a black hole. The resultant
exterior black hole spacetimes necessarily have negative mass and non-trivial
topology. A full theory of quantum gravity, in which topology-changing
processes take pl... | [
{
"created": "Tue, 6 May 1997 17:35:31 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Mann",
"R. B.",
""
]
] | I demonstrate that, under certain circumstances, regions of negative energy density can undergo gravitational collapse into a black hole. The resultant exterior black hole spacetimes necessarily have negative mass and non-trivial topology. A full theory of quantum gravity, in which topology-changing processes take plac... |
1603.03046 | Gianluca Calcagni | Gianluca Calcagni | Lorentz violations in multifractal spacetimes | 12 pages, 1 figure. v2: discussion expanded at several points,
comparison with the Lorentz-violating Standard-Model extension added,
references added | Eur. Phys. J. C 77, 291 (2017) | 10.1140/epjc/s10052-017-4841-6 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the recent observation of gravitational waves (GW) produced by a
black-hole merger, we place a lower bound on the energy above which a
multifractal spacetime would display an anomalous geometry and, in particular,
violations of Lorentz invariance. In the so-called multifractional theory with
$q$-derivatives, we... | [
{
"created": "Wed, 9 Mar 2016 21:00:05 GMT",
"version": "v1"
},
{
"created": "Sun, 7 May 2017 09:18:22 GMT",
"version": "v2"
}
] | 2017-05-09 | [
[
"Calcagni",
"Gianluca",
""
]
] | Using the recent observation of gravitational waves (GW) produced by a black-hole merger, we place a lower bound on the energy above which a multifractal spacetime would display an anomalous geometry and, in particular, violations of Lorentz invariance. In the so-called multifractional theory with $q$-derivatives, we s... |
1612.06251 | Federico Guercilena | Federico Guercilena, David Radice, Luciano Rezzolla | Entropy-limited hydrodynamics: a novel approach to relativistic
hydrodynamics | 26 pages, 26 figures. Small revisions, matches the version to be
published | Computational Astrophysics and Cosmology, 2017, 4:3 | 10.1186/s40668-017-0022-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present entropy-limited hydrodynamics (ELH): a new approach for the
computation of numerical fluxes arising in the discretization of hyperbolic
equations in conservation form. ELH is based on the hybridisation of an
unfiltered high-order scheme with the first-order Lax-Friedrichs method. The
activation of the low-... | [
{
"created": "Mon, 19 Dec 2016 16:22:12 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jun 2017 09:19:54 GMT",
"version": "v2"
}
] | 2018-03-19 | [
[
"Guercilena",
"Federico",
""
],
[
"Radice",
"David",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | We present entropy-limited hydrodynamics (ELH): a new approach for the computation of numerical fluxes arising in the discretization of hyperbolic equations in conservation form. ELH is based on the hybridisation of an unfiltered high-order scheme with the first-order Lax-Friedrichs method. The activation of the low-or... |
2109.08696 | Karthik Rajeev | Karthik Rajeev, Vikramaditya Mondal and Sumanta Chakraborty | Bouncing with shear: Implications from quantum cosmology | This article is dedicated to the memory of Paddy (Prof. T.
Padmanabhan), who incidentally started his monumental career with quantum
cosmology | JCAP 01 (2022) 01, 008 | 10.1088/1475-7516/2022/01/008 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the introduction of anisotropy in a class of bouncing models of
cosmology. The presence of anisotropy often spells doom on bouncing models,
since the energy density due to the anisotropic stress outweighs that of other
matter components, as the universe contracts. Different suggestions have been
made in t... | [
{
"created": "Fri, 17 Sep 2021 18:00:29 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2021 09:18:24 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jan 2022 06:11:52 GMT",
"version": "v3"
}
] | 2022-01-27 | [
[
"Rajeev",
"Karthik",
""
],
[
"Mondal",
"Vikramaditya",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | We consider the introduction of anisotropy in a class of bouncing models of cosmology. The presence of anisotropy often spells doom on bouncing models, since the energy density due to the anisotropic stress outweighs that of other matter components, as the universe contracts. Different suggestions have been made in the... |
2006.06750 | Sebasti\'an Bahamonde Dr | Sebastian Bahamonde, Jackson Levi Said, M. Zubair | Solar System Tests in Modified Teleparallel Gravity | 25 pages, matches the final version published in JCAP | JCAP10(2020)024 | 10.1088/1475-7516/2020/10/024 | null | gr-qc astro-ph.EP astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study different Solar System tests in a modified
Teleparallel gravity theory based on an arbitrary function $f(T,B)$ which
depends on the scalar torsion $T$ and the boundary term $B$. To do this, we
first find new perturbed spherically symmetric solutions around Schwarzschild
for different power-law... | [
{
"created": "Thu, 11 Jun 2020 19:09:37 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2020 14:34:28 GMT",
"version": "v2"
}
] | 2020-10-13 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Zubair",
"M.",
""
]
] | In this paper, we study different Solar System tests in a modified Teleparallel gravity theory based on an arbitrary function $f(T,B)$ which depends on the scalar torsion $T$ and the boundary term $B$. To do this, we first find new perturbed spherically symmetric solutions around Schwarzschild for different power-law f... |
2311.14066 | Aneta Wojnar | Aneta Wojnar | Unveiling Phase Space Modifications: A Clash of Modified Gravity and the
Generalized Uncertainty Principle | 6 pages, minor changes to text to match version accepted for
publication in Phys.Rev.D | Phys. Rev. D 109, 024011 (2024) | 10.1103/PhysRevD.109.024011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study explores the link between Modified Gravity and modifications of
phase space volume. Analyzing Fermi gas modifications {in the non-relativistic
limit of the} Ricci-based gravities, we derive a generalized partition function
in the grand-canonical ensemble, connecting Modified Gravity models with the
General... | [
{
"created": "Thu, 23 Nov 2023 15:50:23 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2023 20:06:31 GMT",
"version": "v2"
}
] | 2024-01-10 | [
[
"Wojnar",
"Aneta",
""
]
] | This study explores the link between Modified Gravity and modifications of phase space volume. Analyzing Fermi gas modifications {in the non-relativistic limit of the} Ricci-based gravities, we derive a generalized partition function in the grand-canonical ensemble, connecting Modified Gravity models with the Generaliz... |
gr-qc/0209016 | Bernhard Haisch | Bernard Haisch, Alfonso Rueda, L. J. Nickisch, Jules Mollere | Update on an Electromagnetic Basis for Inertia, Gravitation, the
Principle of Equivalence, Spin and Particle Mass Ratios | 10 pages, 4 figures, AIP Conf. Proc., Space Technology and
Applications International Forum (STAIF-2003) | null | 10.1063/1.1541386 | null | gr-qc | null | A possible connection between the electromagnetic quantum vacuum and inertia
was first published by Haisch, Rueda and Puthoff (1994). If correct, this would
imply that mass may be an electromagnetic phenomenon and thus in principle
subject to modification, with possible technological implications for
propulsion. A mu... | [
{
"created": "Thu, 5 Sep 2002 16:31:36 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Haisch",
"Bernard",
""
],
[
"Rueda",
"Alfonso",
""
],
[
"Nickisch",
"L. J.",
""
],
[
"Mollere",
"Jules",
""
]
] | A possible connection between the electromagnetic quantum vacuum and inertia was first published by Haisch, Rueda and Puthoff (1994). If correct, this would imply that mass may be an electromagnetic phenomenon and thus in principle subject to modification, with possible technological implications for propulsion. A mult... |
2010.10551 | Ali Kaya | Ali Kaya | Null geodesic congruences, gravitational lensing and CMB intensity
profile | 28 pages, 5 figures, v2: comments and references added, to appear in
JCAP | null | 10.1088/1475-7516/2021/01/065 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the Cosmic Microwave Background (CMB) temperature
fluctuations are modified by gravitational lensing since the angular positions
of photons are altered by the metric perturbations. We reconsider this effect
in the context of geodesic deviation on a perturbed Friedmann-Robertson-Walker
(FRW) spacetime... | [
{
"created": "Tue, 20 Oct 2020 18:07:39 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 2021 16:23:07 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Kaya",
"Ali",
""
]
] | It is known that the Cosmic Microwave Background (CMB) temperature fluctuations are modified by gravitational lensing since the angular positions of photons are altered by the metric perturbations. We reconsider this effect in the context of geodesic deviation on a perturbed Friedmann-Robertson-Walker (FRW) spacetime w... |
1511.07058 | Anatoly Svidzinsky | Anatoly A. Svidzinsky | Vector theory of gravity: Universe without black holes and solution of
dark energy problem | 58 pages, 12 figures, Final version published in Physica Scripta | Physica Scripta 92, 125001 (2017) | 10.1088/1402-4896/aa93a8 | null | gr-qc astro-ph.CO astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose an alternative theory of gravity which assumes that background
geometry of the Universe is fixed four dimensional Euclidean space and gravity
is a vector field $A_k$ in this space which breaks the Euclidean symmetry.
Direction of $A_k$ gives the time coordinate, while perpendicular directions
are spatial c... | [
{
"created": "Sun, 22 Nov 2015 19:36:54 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2016 23:44:56 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Nov 2017 18:29:57 GMT",
"version": "v3"
}
] | 2017-11-21 | [
[
"Svidzinsky",
"Anatoly A.",
""
]
] | We propose an alternative theory of gravity which assumes that background geometry of the Universe is fixed four dimensional Euclidean space and gravity is a vector field $A_k$ in this space which breaks the Euclidean symmetry. Direction of $A_k$ gives the time coordinate, while perpendicular directions are spatial coo... |
1205.5587 | Peter Taylor | Adrian C. Ottewill and Peter Taylor | Static Kerr Green's Function in Closed Form and an Analytic Derivation
of the Self-Force for a Static Scalar Charge in Kerr Space-Time | 18 pages, 2 figures | null | 10.1103/PhysRevD.86.024036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a closed-form solution for the Green's function for the wave
equation of a static (with respect to an undragged, static observer at
infinity) scalar charge in the Kerr space-time. We employ our solution to
obtain an analytic expression for the self-force on such a charge, comparing
our results to those prev... | [
{
"created": "Thu, 24 May 2012 23:03:56 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Ottewill",
"Adrian C.",
""
],
[
"Taylor",
"Peter",
""
]
] | We derive a closed-form solution for the Green's function for the wave equation of a static (with respect to an undragged, static observer at infinity) scalar charge in the Kerr space-time. We employ our solution to obtain an analytic expression for the self-force on such a charge, comparing our results to those previo... |
2312.00450 | Emmanuele Battista Dr. | Emmanuele Battista | Quantum Schwarzschild geometry in effective-field-theory models of
gravity | 36 pages, 3 figures; accepted for publication in Physical Review D | null | 10.1103/PhysRevD.109.026004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Schwarzschild geometry is investigated within the context of
effective-field-theory models of gravity. Starting from its harmonic-coordinate
expression, we derive the metric in standard coordinates by keeping the leading
one-loop quantum contributions in their most general form. We examine the
metric horizons and... | [
{
"created": "Fri, 1 Dec 2023 09:29:54 GMT",
"version": "v1"
}
] | 2024-01-08 | [
[
"Battista",
"Emmanuele",
""
]
] | The Schwarzschild geometry is investigated within the context of effective-field-theory models of gravity. Starting from its harmonic-coordinate expression, we derive the metric in standard coordinates by keeping the leading one-loop quantum contributions in their most general form. We examine the metric horizons and t... |
gr-qc/9703070 | null | A. S. Majumdar (S.N.Bose National Centre for Basic Sciences, Calcutta,
India) | Constraints on Higher Dimensional Models for viable Extended Inflation | 17 pages, 2 Postscript figures, To appear in Physical Review D | Phys.Rev. D55 (1997) 6092-6098 | 10.1103/PhysRevD.55.6092 | null | gr-qc | null | We consider two kinds of higher dimensional models which upon dimensional
reduction lead to Jordan-Brans-Dicke type effective actions in four dimensions
with the scale factor of the extra dimensions playing the role of the JBD
field. These models are characterized by the potential for the JBD field which
arises from ... | [
{
"created": "Fri, 21 Mar 1997 16:18:09 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Majumdar",
"A. S.",
"",
"S.N.Bose National Centre for Basic Sciences, Calcutta,\n India"
]
] | We consider two kinds of higher dimensional models which upon dimensional reduction lead to Jordan-Brans-Dicke type effective actions in four dimensions with the scale factor of the extra dimensions playing the role of the JBD field. These models are characterized by the potential for the JBD field which arises from th... |
2210.13272 | Sergey Paston | S.S. Kuptsov, M.V. Ioffe, S.N. Manida, S.A. Paston | Weak field limit for embedding gravity | LaTeX, 14 pages. This version corresponds to the published one | Universe 2022, 8(12), 635 | 10.3390/universe8120635 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a perturbation theory for embedding gravity equations in a
background for which corrections to the embedding function are linear with
respect to corrections to the flat metric. The arbitrariness remaining after
solving the linearized field equations is fixed by an assumption that the
solution is static in th... | [
{
"created": "Mon, 24 Oct 2022 14:12:36 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2022 19:07:16 GMT",
"version": "v2"
}
] | 2022-12-02 | [
[
"Kuptsov",
"S. S.",
""
],
[
"Ioffe",
"M. V.",
""
],
[
"Manida",
"S. N.",
""
],
[
"Paston",
"S. A.",
""
]
] | We study a perturbation theory for embedding gravity equations in a background for which corrections to the embedding function are linear with respect to corrections to the flat metric. The arbitrariness remaining after solving the linearized field equations is fixed by an assumption that the solution is static in the ... |
2107.03839 | Rafael Robson Lino dos Santos | Gustavo P. de Brito, Astrid Eichhorn, Rafael Robson Lino dos Santos | The weak-gravity bound and the need for spin in asymptotically safe
matter-gravity models | 18 pages + appendix, 18 figures. Version identical with published
one, except for correction of typo in Eq. 3.6 | null | 10.1007/JHEP11(2021)110 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discover a weak-gravity bound in scalar-gravity systems in the
asymptotic-safety paradigm. The weak-gravity bound arises in these systems
under the approximations we make, when gravitational fluctuations exceed a
critical strength. Beyond this critical strength, gravitational fluctuations
can generate complex fixe... | [
{
"created": "Thu, 8 Jul 2021 13:34:29 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2022 17:48:46 GMT",
"version": "v2"
}
] | 2022-01-12 | [
[
"de Brito",
"Gustavo P.",
""
],
[
"Eichhorn",
"Astrid",
""
],
[
"Santos",
"Rafael Robson Lino dos",
""
]
] | We discover a weak-gravity bound in scalar-gravity systems in the asymptotic-safety paradigm. The weak-gravity bound arises in these systems under the approximations we make, when gravitational fluctuations exceed a critical strength. Beyond this critical strength, gravitational fluctuations can generate complex fixed-... |
2407.20605 | Zeeshan Gul | M. Zeeshan Gul, M. Sharif and Shamraiza Shabbir | Comprehensive Study of Bouncing Cosmological Models in $f(Q,T)$ Theory | 31 pages, 23 figures, The European Physical Journal C (Accepted) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main objective of this article is to investigate the viability of
bouncing cosmological scenarios using different forms of scale factors with
perfect matter configuration in the framework of extended symmetric
teleparallel theory. This modified proposal is defined by the function
$f(Q,T)$, where $Q$ characterizes... | [
{
"created": "Tue, 30 Jul 2024 07:31:19 GMT",
"version": "v1"
}
] | 2024-07-31 | [
[
"Gul",
"M. Zeeshan",
""
],
[
"Sharif",
"M.",
""
],
[
"Shabbir",
"Shamraiza",
""
]
] | The main objective of this article is to investigate the viability of bouncing cosmological scenarios using different forms of scale factors with perfect matter configuration in the framework of extended symmetric teleparallel theory. This modified proposal is defined by the function $f(Q,T)$, where $Q$ characterizes n... |
2008.02248 | Collin Capano | Collin D. Capano and Alexander H. Nitz | Binary black hole spectroscopy: a no-hair test of GW190814 and GW190412 | 8 pages, 4 figures; supplemental material at:
https://github.com/gwastro/binary-black-hole-spectroscopy | Phys. Rev. D 102, 124070 (2020) | 10.1103/PhysRevD.102.124070 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves provide a window to probe general relativity (GR) under
extreme conditions. The recent observations of GW190412 and GW190814 are unique
high-mass-ratio mergers that enable the observation of gravitational-wave
harmonics beyond the dominant $(\ell, m) = (2, 2)$ mode. Using these events, we
search f... | [
{
"created": "Wed, 5 Aug 2020 17:26:41 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2020 19:16:36 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Dec 2020 18:18:37 GMT",
"version": "v3"
}
] | 2021-01-04 | [
[
"Capano",
"Collin D.",
""
],
[
"Nitz",
"Alexander H.",
""
]
] | Gravitational waves provide a window to probe general relativity (GR) under extreme conditions. The recent observations of GW190412 and GW190814 are unique high-mass-ratio mergers that enable the observation of gravitational-wave harmonics beyond the dominant $(\ell, m) = (2, 2)$ mode. Using these events, we search for... |
1008.1720 | Lorenzo Iorio | Lorenzo Iorio | Long-term classical and general relativistic effects on the radial
velocities of the stars orbiting Sgr A* | LaTex2e, 23 pages, no tables, 1 figure. To appear in Monthly Notices
of the Royal Astronomical Society (MNRAS) | Mon.Not.Roy.Astron.Soc.411:453-463,2011 | 10.1111/j.1365-2966.2010.17701.x | null | gr-qc astro-ph.GA physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically work out the cumulative, i.e. averaged over one orbital
revolution, time variations of the radial velocity v_r of a typical S star
orbiting the Supermassive Black Hole (SBH) hosted by the Galactic Center (GC)
in Sgr A* caused by several dynamical effects. They are the general
relativistic gravitoelect... | [
{
"created": "Tue, 10 Aug 2010 14:20:44 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 2010 07:02:27 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Aug 2010 13:00:51 GMT",
"version": "v3"
},
{
"created": "Mon, 13 Sep 2010 17:43:14 GMT",
"version": "v4"
}
] | 2016-11-25 | [
[
"Iorio",
"Lorenzo",
""
]
] | We analytically work out the cumulative, i.e. averaged over one orbital revolution, time variations of the radial velocity v_r of a typical S star orbiting the Supermassive Black Hole (SBH) hosted by the Galactic Center (GC) in Sgr A* caused by several dynamical effects. They are the general relativistic gravitoelectro... |
gr-qc/0606010 | Christian Fronsdal | Christian Fronsdal | Cosmology with an Action Principle | TeX file; 9 pages | null | null | UCLA/06/TEP/16 | gr-qc | null | The Friedman universe is re-examined in a context that is non-standard only
in that the properties of matter are postulated in the form of an action
principle. Applications to equilibrium configurations of ideal stars have
already been reported. In this paper we apply the same theory to a fresh
examination of the Fri... | [
{
"created": "Thu, 1 Jun 2006 21:59:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fronsdal",
"Christian",
""
]
] | The Friedman universe is re-examined in a context that is non-standard only in that the properties of matter are postulated in the form of an action principle. Applications to equilibrium configurations of ideal stars have already been reported. In this paper we apply the same theory to a fresh examination of the Fried... |
1609.07294 | Parthapratim Pradhan | Parthapratim Pradhan | Entropy Product Formula for Gravitational Instanton | Version accepted in AHEP | Advances in High Energy Physics Volume 2017 (2017), Article ID
7471640, 7 pages | 10.1155/2017/7471640 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the entropy product formula for various gravitational
instantons. We speculate that due to the mass-independent features of the said
instantons they are \emph{universal} as well as they are \emph{quantized}. For
isolated Euclidean Schwarzschild black hole, these properties simply
\emph{fail}.
| [
{
"created": "Fri, 23 Sep 2016 10:06:02 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2017 16:37:39 GMT",
"version": "v2"
}
] | 2017-04-25 | [
[
"Pradhan",
"Parthapratim",
""
]
] | We investigate the entropy product formula for various gravitational instantons. We speculate that due to the mass-independent features of the said instantons they are \emph{universal} as well as they are \emph{quantized}. For isolated Euclidean Schwarzschild black hole, these properties simply \emph{fail}. |
gr-qc/0001103 | Plamen Fiziev | P. Fiziev, S. Yazadjiev, T. Boyadjiev, M. Todorov | Boson stars in massive dilatonic gravity | 9 pages, latex, 9 figures, one figure dropped, new comments added,
new references added, typos corrected | Phys.Rev. D61 (2000) 124018 | 10.1103/PhysRevD.61.124018 | SU-FzF-ThPh: 1/2000 | gr-qc | null | We study equilibrium configurations of boson stars in the framework of a
class scalar-tensor theories of gravity with massive gravitational scalar
(dilaton). In particular we investigate the influence of the mass of the
dilaton on the boson star structure. We find that the masses of the boson stars
in presence of dil... | [
{
"created": "Mon, 31 Jan 2000 18:09:58 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2000 17:13:15 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Fiziev",
"P.",
""
],
[
"Yazadjiev",
"S.",
""
],
[
"Boyadjiev",
"T.",
""
],
[
"Todorov",
"M.",
""
]
] | We study equilibrium configurations of boson stars in the framework of a class scalar-tensor theories of gravity with massive gravitational scalar (dilaton). In particular we investigate the influence of the mass of the dilaton on the boson star structure. We find that the masses of the boson stars in presence of dilat... |
1305.3448 | Aninda Sinha | Arpan Bhattacharyya, Aninda Sinha | Entanglement entropy from surface terms in general relativity | 6 pages 1 fig. Essay awarded honourable mention in the Gravity
Research Foundation 2013 Awards for Essays on Gravitation. v2: to appear in
IJMPD spl. issue | IJMPD 22, 12 (2013) 1342020 | 10.1142/S0218271813420200 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Entanglement entropy in local quantum field theories is typically ultraviolet
divergent due to short distance effects in the neighbourhood of the entangling
region. In the context of gauge/gravity duality, we show that surface terms in
general relativity are able to capture this entanglement entropy. In
particular, w... | [
{
"created": "Wed, 15 May 2013 12:45:59 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Sep 2013 04:25:57 GMT",
"version": "v2"
}
] | 2013-10-04 | [
[
"Bhattacharyya",
"Arpan",
""
],
[
"Sinha",
"Aninda",
""
]
] | Entanglement entropy in local quantum field theories is typically ultraviolet divergent due to short distance effects in the neighbourhood of the entangling region. In the context of gauge/gravity duality, we show that surface terms in general relativity are able to capture this entanglement entropy. In particular, we ... |
1904.08209 | Matteo Tuveri | Matteo Tuveri, Mariano Cadoni | A new perspective on galactic dynamics | 5 pages, no figures, letter | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the radial acceleration of stars in galaxies by using basic
features of thermodynamics, statistical mechanics and general relativity. We
assume that the "dark" component of the radial acceleration is originated from
the reaction of dark energy to the presence of baryonic matter. It can be also
explained as ... | [
{
"created": "Wed, 17 Apr 2019 11:54:48 GMT",
"version": "v1"
}
] | 2019-04-18 | [
[
"Tuveri",
"Matteo",
""
],
[
"Cadoni",
"Mariano",
""
]
] | We derive the radial acceleration of stars in galaxies by using basic features of thermodynamics, statistical mechanics and general relativity. We assume that the "dark" component of the radial acceleration is originated from the reaction of dark energy to the presence of baryonic matter. It can be also explained as th... |
1101.4741 | Ahmadjon Abdujabbarov | Ahmadjon Abdujabbarov, Bobomurat Ahmedov, Abdullo Hakimov | Particle Motion around Black Hole in Horava-Lifshitz Gravity | 6 pages, 8 figures, 1 table, Accepted for publication in Physical
Review D | Phys.Rev.D83:044053,2011 | 10.1103/PhysRevD.83.044053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analytical solutions of Maxwell equations around black hole immersed in
external uniform magnetic field in the background of the Kehagias-Sfetsos (KS)
asymptotically flat black hole solution of Ho\v{r}ava-Lifshitz gravity have
been found. Influence of magnetic field on effective potential of the radial
motion of char... | [
{
"created": "Tue, 25 Jan 2011 08:01:15 GMT",
"version": "v1"
}
] | 2011-03-18 | [
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Hakimov",
"Abdullo",
""
]
] | Analytical solutions of Maxwell equations around black hole immersed in external uniform magnetic field in the background of the Kehagias-Sfetsos (KS) asymptotically flat black hole solution of Ho\v{r}ava-Lifshitz gravity have been found. Influence of magnetic field on effective potential of the radial motion of charge... |
1401.6948 | Ahmad Shariati | Ahmad Shariati and N. Jafari | Is there a map between Galilean relativity and special relativity? | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mandanici has provided a map which he claims to be a two way map between
Galilean relativity and special relativity. We argue that this map is simply a
curvilinear coordinate system on a subset of the two-dimensional Minkowski
space-time, and is not a two way map between 1+1 dimensional Galilean
relativity and 1+1 di... | [
{
"created": "Mon, 27 Jan 2014 18:12:37 GMT",
"version": "v1"
}
] | 2014-01-28 | [
[
"Shariati",
"Ahmad",
""
],
[
"Jafari",
"N.",
""
]
] | Mandanici has provided a map which he claims to be a two way map between Galilean relativity and special relativity. We argue that this map is simply a curvilinear coordinate system on a subset of the two-dimensional Minkowski space-time, and is not a two way map between 1+1 dimensional Galilean relativity and 1+1 dime... |
1306.0001 | Muhammad Azam | M. Sharif and M. Azam | Effects of Electromagnetic Field on the Dynamical Instability of
Expansionfree Gravitational Collapse | 20 pages, no figure | Gen. Relativ. Gravit. 44(2012)1181 | 10.1007/s10714-012-1333-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we discuss the effects of electromagnetic field on the
dynamical instability of a spherically symmetric expansionfree gravitational
collapse. Darmois junction conditions are formulated by matching interior
spherically symmetric spacetime to exterior Reissner-Nordstr$\ddot{o}$m
spacetime. We investigate... | [
{
"created": "Fri, 31 May 2013 07:39:59 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Sharif",
"M.",
""
],
[
"Azam",
"M.",
""
]
] | In this paper, we discuss the effects of electromagnetic field on the dynamical instability of a spherically symmetric expansionfree gravitational collapse. Darmois junction conditions are formulated by matching interior spherically symmetric spacetime to exterior Reissner-Nordstr$\ddot{o}$m spacetime. We investigate t... |
2007.04867 | Tuan Do | Tuan Q. Do | Stable small spatial hairs in a power-law k-inflation model | 15 pages, 2 figures. Substantial revision with discussions on seminal
papers of Starobinsky related to the cosmic no-hair conjecture and
investigations on the corresponding tensor-to-scalar ratio. Main results and
conclusions are not changed. Comments are welcome | Eur. Phys. J. C 81, 77 (2021) | 10.1140/epjc/s10052-021-08866-7 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we extend our investigation of the validity of the cosmic
no-hair conjecture within non-canonical anisotropic inflation. As a result, we
are able to figure out an exact Bianchi type I solution to a power-law {\it
k}-inflation model in the presence of unusual coupling between scalar and
electromagnetic ... | [
{
"created": "Thu, 9 Jul 2020 15:07:21 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2020 05:24:52 GMT",
"version": "v2"
}
] | 2021-01-26 | [
[
"Do",
"Tuan Q.",
""
]
] | In this paper, we extend our investigation of the validity of the cosmic no-hair conjecture within non-canonical anisotropic inflation. As a result, we are able to figure out an exact Bianchi type I solution to a power-law {\it k}-inflation model in the presence of unusual coupling between scalar and electromagnetic fi... |
gr-qc/9706045 | Eanna Flanagan | Eanna E. Flanagan | General-relativistic coupling between orbital motion and internal
degrees of freedom for inspiraling binary neutron stars | 22 pages, 2 figures. Replaced 13 July: proof corrected, result
unchanged | Phys.Rev. D58 (1998) 124030 | 10.1103/PhysRevD.58.124030 | null | gr-qc astro-ph | null | We analyze the coupling between the internal degrees of freedom of neutron
stars in a close binary, and the stars' orbital motion. Our analysis is based
on the method of matched asymptotic expansions and is valid to all orders in
the strength of internal gravity in each star, but is perturbative in the
``tidal expans... | [
{
"created": "Mon, 16 Jun 1997 14:10:09 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 1998 01:17:31 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Flanagan",
"Eanna E.",
""
]
] | We analyze the coupling between the internal degrees of freedom of neutron stars in a close binary, and the stars' orbital motion. Our analysis is based on the method of matched asymptotic expansions and is valid to all orders in the strength of internal gravity in each star, but is perturbative in the ``tidal expansio... |
1404.6522 | Mohd. Shahalam | Sarita Rani, A. Altaibayeva, M. Shahalam, J. K. Singh, R. Myrzakulov | Constraints on cosmological parameters in power-law cosmology | 14 pages, 4 figures, 4 tables, thoroughly revised, text added in
conclusion, accepted for publication in JCAP | JCAP 03 (2015) 031 | 10.1088/1475-7516/2015/03/031 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine observational constraints on the power law
cosmology; essentially dependent on two parameters $H_0$ (Hubble constant) and
$q$ (deceleration parameter). We investigate the constraints on these
parameters using the latest 28 points of H(z) data and 580 points of Union2.1
compilation data and, ... | [
{
"created": "Fri, 25 Apr 2014 12:39:52 GMT",
"version": "v1"
},
{
"created": "Tue, 20 May 2014 19:05:19 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Mar 2015 09:07:37 GMT",
"version": "v3"
},
{
"created": "Wed, 18 Mar 2015 09:44:38 GMT",
"version": "v4"
},
{
"cr... | 2015-03-20 | [
[
"Rani",
"Sarita",
""
],
[
"Altaibayeva",
"A.",
""
],
[
"Shahalam",
"M.",
""
],
[
"Singh",
"J. K.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | In this paper, we examine observational constraints on the power law cosmology; essentially dependent on two parameters $H_0$ (Hubble constant) and $q$ (deceleration parameter). We investigate the constraints on these parameters using the latest 28 points of H(z) data and 580 points of Union2.1 compilation data and, co... |
1211.6558 | Lijing Shao | Lijing Shao, Norbert Wex, Michael Kramer | New tests of local Lorentz invariance and local position invariance of
gravity with pulsars | 3 pages, 1 figure; submitted to Proceedings of the Thirteenth Marcel
Grossmann Meeting, (eds.) Kjell Rosquist, Robert T Jantzen, Remo Ruffini | null | 10.1142/9789814623995_0261 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New tests are proposed to constrain possible deviations from local Lorentz
invariance and local position invariance in the gravity sector. By using
precise timing results of two binary pulsars, i.e., PSRs J1012+5307 and
J1738+0333, we are able to constrain (strong-field) parametrized post-Newtonian
parameters $\hat{\... | [
{
"created": "Wed, 28 Nov 2012 09:55:13 GMT",
"version": "v1"
}
] | 2016-12-28 | [
[
"Shao",
"Lijing",
""
],
[
"Wex",
"Norbert",
""
],
[
"Kramer",
"Michael",
""
]
] | New tests are proposed to constrain possible deviations from local Lorentz invariance and local position invariance in the gravity sector. By using precise timing results of two binary pulsars, i.e., PSRs J1012+5307 and J1738+0333, we are able to constrain (strong-field) parametrized post-Newtonian parameters $\hat{\al... |
2208.11859 | Bin Wu | Yan-Ying Bai, Xuan-Rui Chen, Zhen-Ming Xu, Bin Wu | Revisit on thermodynamics of BTZ black hole with variable Newton
constant | 16 pages, no figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermodynamics of the BTZ black holes are revisited with variable Newton
constant. A new pair of conjugated variables, the central charge $C$ and the
chemical potential $\mu$, is introduced as thermodynamic variables. The first
law of thermodynamics and the Euler relation, instead of the Smarr relation in
the ext... | [
{
"created": "Thu, 25 Aug 2022 03:54:55 GMT",
"version": "v1"
}
] | 2022-08-26 | [
[
"Bai",
"Yan-Ying",
""
],
[
"Chen",
"Xuan-Rui",
""
],
[
"Xu",
"Zhen-Ming",
""
],
[
"Wu",
"Bin",
""
]
] | The thermodynamics of the BTZ black holes are revisited with variable Newton constant. A new pair of conjugated variables, the central charge $C$ and the chemical potential $\mu$, is introduced as thermodynamic variables. The first law of thermodynamics and the Euler relation, instead of the Smarr relation in the exten... |
1804.02984 | Subenoy Chakraborty | Sourav Dutta, Muthusamy Lakshmanan and Subenoy Chakraborty | Non-minimally coupled scalar field in Kantowski--Sachs model and
symmetry analysis | Accepted in "Annals of Physics" | null | 10.1016/j.aop.2018.04.007 | null | gr-qc nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with a non--minimally coupled scalar field in the background
of homogeneous but anisotropic Kantowski--Sachs space--time model. The form of
the coupling function of the scalar field with gravity and the potential
function of the scalar field are not assumed phenomenologically, rather they
are evaluate... | [
{
"created": "Tue, 3 Apr 2018 08:33:28 GMT",
"version": "v1"
}
] | 2018-05-23 | [
[
"Dutta",
"Sourav",
""
],
[
"Lakshmanan",
"Muthusamy",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The paper deals with a non--minimally coupled scalar field in the background of homogeneous but anisotropic Kantowski--Sachs space--time model. The form of the coupling function of the scalar field with gravity and the potential function of the scalar field are not assumed phenomenologically, rather they are evaluated ... |
1206.2801 | Sergey Yu. Vernov | I.Ya. Aref'eva, N.V. Bulatov, R.V. Gorbachev, S.Yu. Vernov | Non-minimally Coupled Cosmological Models with the Higgs-like Potentials
and Negative Cosmological Constant | 22 pages, 6 figures, v4:Section 2 expanded, references added,
accepted for publication in Class. Quant. Grav | Class. Quantum Grav. 31 (2014) 065007 | 10.1088/0264-9381/31/6/065007 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dynamics of non-minimally coupled scalar field cosmological models
with Higgs-like potentials and a negative cosmological constant. In these
models the inflationary stage of the Universe evolution changes into a
quasi-cyclic stage of the Universe evolution with oscillation behaviour of the
Hubble parameter f... | [
{
"created": "Wed, 13 Jun 2012 13:33:53 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jul 2012 09:51:49 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Apr 2013 18:47:15 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Jan 2014 19:27:26 GMT",
"version": "v4"
}
] | 2014-02-26 | [
[
"Aref'eva",
"I. Ya.",
""
],
[
"Bulatov",
"N. V.",
""
],
[
"Gorbachev",
"R. V.",
""
],
[
"Vernov",
"S. Yu.",
""
]
] | We study dynamics of non-minimally coupled scalar field cosmological models with Higgs-like potentials and a negative cosmological constant. In these models the inflationary stage of the Universe evolution changes into a quasi-cyclic stage of the Universe evolution with oscillation behaviour of the Hubble parameter fro... |
1210.2075 | Parthapratim Pradhan | Partha Pratim Pradhan | ISCO and Principal Null Congruences in Extremal Kerr Spacetime | 6 pages, Prepared for the Proceedings of COSGRAV-12,Indian
Statistical Institute, Kolkata, 7-11 February 2012, to appear in Journal of
Physics: Conference Series (JPCS) | Journal of Physics: Conference Series 405 (2012) 012027 | 10.1088/1742-6596/405/1/012027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective potential in universal like coordinates$(U, V, \theta, \phi)$,
which are smooth across the event horizon is derived and investigated the
ISCO(Innermost Stable Circular Orbits) explicitly in these coordinates for
extremal Kerr spacetime. Extremization of the effective potential for timelike
circular orbi... | [
{
"created": "Sun, 7 Oct 2012 16:46:29 GMT",
"version": "v1"
}
] | 2012-12-27 | [
[
"Pradhan",
"Partha Pratim",
""
]
] | The effective potential in universal like coordinates$(U, V, \theta, \phi)$, which are smooth across the event horizon is derived and investigated the ISCO(Innermost Stable Circular Orbits) explicitly in these coordinates for extremal Kerr spacetime. Extremization of the effective potential for timelike circular orbit ... |
gr-qc/0212098 | Sergey S. Kokarev | Sergey S. Kokarev | 5-Dimensional Covariance and Generation of Solutions of Einstein
Equations | Latex 2.09, 6 pages | Grav.Cosmol. 4 (1998) 283-286 | null | null | gr-qc | null | A generation procedure, based on the 5-dimensional covariance of the
Kaluza-Klein theory, is developed. The procedure allows one to obtain exact
solutions of the 4-dimensional Einstein equations with electromagnetic and
scalar fields from vacuum 5-dimensional solutions using special 5-dimensional
coordinate transform... | [
{
"created": "Mon, 23 Dec 2002 19:01:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kokarev",
"Sergey S.",
""
]
] | A generation procedure, based on the 5-dimensional covariance of the Kaluza-Klein theory, is developed. The procedure allows one to obtain exact solutions of the 4-dimensional Einstein equations with electromagnetic and scalar fields from vacuum 5-dimensional solutions using special 5-dimensional coordinate transformat... |
gr-qc/0608129 | James M. Overduin | James M. Overduin and Hans S. Plendl | Leopold Halpern and the generalization of general relativity | 12 pages, 1 figure. To appear in the proceedings of the Eleventh
Marcel Grossmann Meeting on General Relativity, ed. H. Kleinert, R.T. Jantzen
and R. Ruffini (World Scientific, Singapore, 2007) | null | null | null | gr-qc | null | Leopold Halpern, who was a close associate of both Erwin Schroedinger and
Paul Dirac before making his own mark as a theoretical physicist of the first
rank, died in Tallahassee, Florida on 3 June 2006 after a valiant struggle with
cancer. We give an outline of his life and work, including his progress towards
a unif... | [
{
"created": "Tue, 29 Aug 2006 23:22:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Overduin",
"James M.",
""
],
[
"Plendl",
"Hans S.",
""
]
] | Leopold Halpern, who was a close associate of both Erwin Schroedinger and Paul Dirac before making his own mark as a theoretical physicist of the first rank, died in Tallahassee, Florida on 3 June 2006 after a valiant struggle with cancer. We give an outline of his life and work, including his progress towards a unifie... |
gr-qc/9306003 | null | J. W. Moffat | Consistency of the Nonsymmetric Gravitational Theory | 26 pages plain TeX. Revised version of UTPT-93-11. TeX macro provided | null | null | null | gr-qc | null | The NGT field equations with sources are expanded first about a flat
Minkowski background and then about a GR background to first-order in the
antisymmetric part of the fundamental tensor, $g_{\mu\nu}$. From the general,
static spherically symmetric solution of the field equation in empty space, we
establish that the... | [
{
"created": "Tue, 1 Jun 1993 17:49:09 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 1994 21:13:55 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Moffat",
"J. W.",
""
]
] | The NGT field equations with sources are expanded first about a flat Minkowski background and then about a GR background to first-order in the antisymmetric part of the fundamental tensor, $g_{\mu\nu}$. From the general, static spherically symmetric solution of the field equation in empty space, we establish that there... |
1010.2098 | Jacek Jezierski | Piotr T. Chru\'sciel and Jacek Jezierski | On free general relativistic initial data on the light cone | null | null | 10.1016/j.geomphys.2011.04.015 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a simple explicit parameterization of free general relativistic
data on the light cone.
| [
{
"created": "Mon, 11 Oct 2010 13:21:30 GMT",
"version": "v1"
}
] | 2011-12-30 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Jezierski",
"Jacek",
""
]
] | We provide a simple explicit parameterization of free general relativistic data on the light cone. |
gr-qc/9503030 | null | Mirta Iriondo (Stockholm), Edward Malec (Krakow) and Niall \'O
Murchadha (Cork) | The constant mean curvature slices of asymptotically flat spherical
spacetimes | Revtex, 9 pages, no diagrams | Phys.Rev. D54 (1996) 4792-4798 | 10.1103/PhysRevD.54.4792 | null | gr-qc | null | We investigate the formation of trapped surfaces in asymptotically flat
spherical spacetimes, using constant mean curvature slicing.
| [
{
"created": "Thu, 16 Mar 1995 20:29:03 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Iriondo",
"Mirta",
"",
"Stockholm"
],
[
"Malec",
"Edward",
"",
"Krakow"
],
[
"Murchadha",
"Niall Ó",
"",
"Cork"
]
] | We investigate the formation of trapped surfaces in asymptotically flat spherical spacetimes, using constant mean curvature slicing. |
1011.5774 | Rustem Miftakhov | Yu.G.Ignatyev, R.F. Miftakhov | Cosmological evolutions of completely degenerated Fermi-system with the
scalar interparticles interactions | 7 p., 6 fig | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological solutions of Einstein's equations for equilibrium statistical
systems of particles with scalar interaction are investigated. It is shown that
the scalar field can effectively change the state equation of a statistical
system, that leads to the possibility of secondary acceleration of the
cosmological exp... | [
{
"created": "Fri, 26 Nov 2010 12:49:18 GMT",
"version": "v1"
}
] | 2010-11-29 | [
[
"Ignatyev",
"Yu. G.",
""
],
[
"Miftakhov",
"R. F.",
""
]
] | Cosmological solutions of Einstein's equations for equilibrium statistical systems of particles with scalar interaction are investigated. It is shown that the scalar field can effectively change the state equation of a statistical system, that leads to the possibility of secondary acceleration of the cosmological expan... |
1111.4164 | Jozef Skakala | Jozef Skakala | Non-extremal Reissner-Nordstrom black hole: Do asymptotic quasi-normal
modes carry information about the quantum properties of the black hole? | 13 pages, accepted for publication by JHEP | JHEP 1201:144, 2012 | 10.1007/JHEP01(2012)144 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the largely accepted formulas for the asymptotic quasi-normal
frequencies of the non-extremal Reissner-Nordstr\"om black hole, (for the
electromagnetic-gravitational/scalar perturbations). We focus on the question
of whether the gap in the spacing in the imaginary part of the QNM frequencies
has a well def... | [
{
"created": "Thu, 17 Nov 2011 17:43:33 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2012 07:53:54 GMT",
"version": "v2"
}
] | 2012-02-01 | [
[
"Skakala",
"Jozef",
""
]
] | We analyze the largely accepted formulas for the asymptotic quasi-normal frequencies of the non-extremal Reissner-Nordstr\"om black hole, (for the electromagnetic-gravitational/scalar perturbations). We focus on the question of whether the gap in the spacing in the imaginary part of the QNM frequencies has a well defin... |
2002.03845 | Muhammad Sharif | M. Sharif and Arfa Waseem | Inhomogeneous Perturbations and Stability Analysis of the Einstein
Static Universe in f(R,T) Gravity | 18 pages, 4 figures | Astrophys. Space Sci. 364(2019)221 | 10.1007/s10509-019-3711-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to analyze the existence of static stable
Einstein universe using inhomogeneous linear perturbations in the context of
$f(R,T)$ gravity ($R$ and $T$ denote the scalar curvature and trace of the
stress-energy tensor, respectively). The static and perturbed field equations
are constructed f... | [
{
"created": "Fri, 7 Feb 2020 03:03:47 GMT",
"version": "v1"
}
] | 2020-02-19 | [
[
"Sharif",
"M.",
""
],
[
"Waseem",
"Arfa",
""
]
] | The purpose of this paper is to analyze the existence of static stable Einstein universe using inhomogeneous linear perturbations in the context of $f(R,T)$ gravity ($R$ and $T$ denote the scalar curvature and trace of the stress-energy tensor, respectively). The static and perturbed field equations are constructed for... |
2210.09891 | Dmitri Fursaev | E.A. Davydov, D.V. Fursaev, V.A. Tainov | A Note on Stress-Energy Tensor and Variational Principle for Null
Strings | 4 pages | null | 10.1134/S1547477123030305 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A straightforward application of the variational principle to null strings
meets difficulties since string's world-sheets are degenerate. It is known that
the variational principle in this case can be formulted with the help of
two-vector density on the string world-sheet which plays a role of Lagrange
multipliers. I... | [
{
"created": "Tue, 18 Oct 2022 14:30:26 GMT",
"version": "v1"
}
] | 2023-07-12 | [
[
"Davydov",
"E. A.",
""
],
[
"Fursaev",
"D. V.",
""
],
[
"Tainov",
"V. A.",
""
]
] | A straightforward application of the variational principle to null strings meets difficulties since string's world-sheets are degenerate. It is known that the variational principle in this case can be formulted with the help of two-vector density on the string world-sheet which plays a role of Lagrange multipliers. It ... |
1507.08531 | Dr. Sudhaker Upadhyay | Sudhaker Upadhyay | A superspace description of Friedmann-Robertson-Walker models | 12 pages, no figure, to appear in Prog. Theor. Exp. Phys | Prog. Theor. Exp. Phys. 093B06, 1 (2015) | 10.1093/ptep/ptv123 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We illustrate the cosmological Friedmann-Robertson-Walker (FRW) models
realized as gauge theory in the extended configuration space with its
Becchi-Rouet-Stora-Tyutin (BRST) invariance upto total derivative. To
investigate the model in Batalin-Vilkovisky (BV) formalism the Lagrangian
density of the models is further ... | [
{
"created": "Thu, 23 Jul 2015 10:12:02 GMT",
"version": "v1"
}
] | 2015-10-01 | [
[
"Upadhyay",
"Sudhaker",
""
]
] | We illustrate the cosmological Friedmann-Robertson-Walker (FRW) models realized as gauge theory in the extended configuration space with its Becchi-Rouet-Stora-Tyutin (BRST) invariance upto total derivative. To investigate the model in Batalin-Vilkovisky (BV) formalism the Lagrangian density of the models is further ex... |
1507.02839 | Vitaliy Cherkaskiy | Yu. L. Bolotin and V. A. Cherkaskiy | Principle of maximum force and holographic principle: two principles or
one? | 3 pages, minor corrections, text slightly extended, results and
conclusions unchanged | null | null | null | gr-qc cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how the maximum force principle can be derived from the holographic
principle and vice versa, thus demonstrating equivalence of the two principles.
| [
{
"created": "Fri, 10 Jul 2015 10:38:48 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2015 08:07:39 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Sep 2015 10:14:34 GMT",
"version": "v3"
}
] | 2015-09-02 | [
[
"Bolotin",
"Yu. L.",
""
],
[
"Cherkaskiy",
"V. A.",
""
]
] | We show how the maximum force principle can be derived from the holographic principle and vice versa, thus demonstrating equivalence of the two principles. |
1808.08536 | Stefano Vignolo Professor | Stefano Vignolo, Luca Fabbri and Oscar Castillo-Felisola | Dirac spinors and their application to Bianchi-I space-times in 5
dimensions | 14 pages | Advances in Applied Clifford Algebras, 2018 | 10.1007/s00006-018-0935-y | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a five-dimensional Einstein--Cartan spacetime upon which Dirac
spinor fields can be defined. Dirac spinor fields in five and four dimensions
share many features, like the fact that both are described by four-component
spinor fields, but they are also characterized by strong differences, like the
fact that... | [
{
"created": "Sun, 26 Aug 2018 11:48:47 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2018 14:48:32 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Dec 2018 15:10:29 GMT",
"version": "v3"
}
] | 2018-12-31 | [
[
"Vignolo",
"Stefano",
""
],
[
"Fabbri",
"Luca",
""
],
[
"Castillo-Felisola",
"Oscar",
""
]
] | We consider a five-dimensional Einstein--Cartan spacetime upon which Dirac spinor fields can be defined. Dirac spinor fields in five and four dimensions share many features, like the fact that both are described by four-component spinor fields, but they are also characterized by strong differences, like the fact that i... |
gr-qc/9807046 | Masaru Shibata | Masaru Shibata, Misao Sasaki (Osaka University) | Innermost stable circular orbits around relativistic rotating stars | 12 pages, 2 figures, accepted for publication in Phys. Rev. D | Phys.Rev.D58:104011,1998 | 10.1103/PhysRevD.58.104011 | null | gr-qc astro-ph | null | We investigate the innermost stable circular orbit (ISCO) of a test particle
moving on the equatorial plane around rotating relativistic stars such as
neutron stars. First, we derive approximate analytic formulas for the angular
velocity and circumferential radius at the ISCO making use of an approximate
relativistic... | [
{
"created": "Fri, 17 Jul 1998 13:03:25 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Shibata",
"Masaru",
"",
"Osaka University"
],
[
"Sasaki",
"Misao",
"",
"Osaka University"
]
] | We investigate the innermost stable circular orbit (ISCO) of a test particle moving on the equatorial plane around rotating relativistic stars such as neutron stars. First, we derive approximate analytic formulas for the angular velocity and circumferential radius at the ISCO making use of an approximate relativistic s... |
1211.2444 | Alejandro Guarnizo | Alejandro Guarnizo | Cosmological Models in Modified f(R) Gravity Theories | M.Sc. Thesis (in Spanish) defended at Universidad Nacional de
Colombia (Bogot\'a, Colombia, April - 2011). 124 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The actual accelerated expansion of the universe continues being a mystery in
physics. Some models had been proposed for this explanations, among them the
dark energy, which however has problems of experimental character as well as
theoretical. Other approximations, like modified gravity theories are an
interesting a... | [
{
"created": "Sun, 11 Nov 2012 18:01:15 GMT",
"version": "v1"
}
] | 2012-11-13 | [
[
"Guarnizo",
"Alejandro",
""
]
] | The actual accelerated expansion of the universe continues being a mystery in physics. Some models had been proposed for this explanations, among them the dark energy, which however has problems of experimental character as well as theoretical. Other approximations, like modified gravity theories are an interesting alt... |
2301.06772 | Gianluca Gregori | Gianluca Gregori, Giacomo Marocco, Subir Sarkar, Robert Bingham,
Charles Wang | Measuring Unruh radiation from accelerated electrons | This is an expanded version of section 3.2 of arXiv:2211.13187 which
we wrote for the Multi Petawatt Prioritization (MP3) workshop. This paper has
been accepted for publication in EPJC | Eur.Phys.J. C 84 (2024) 475 | 10.1140/epjc/s10052-024-12849-9 | null | gr-qc physics.atom-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | Detecting thermal Unruh radiation from accelerated electrons has presented a
formidable challenge due not only to technical difficulties but also for lack
of conceptual clarity about what is actually seen by a laboratory observer. We
give a summary of the current interpretations along with a simpler heuristic
descrip... | [
{
"created": "Tue, 17 Jan 2023 09:44:08 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2023 17:50:05 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Mar 2023 10:00:18 GMT",
"version": "v3"
},
{
"created": "Wed, 26 Apr 2023 13:15:21 GMT",
"version": "v4"
},
{
"c... | 2024-05-09 | [
[
"Gregori",
"Gianluca",
""
],
[
"Marocco",
"Giacomo",
""
],
[
"Sarkar",
"Subir",
""
],
[
"Bingham",
"Robert",
""
],
[
"Wang",
"Charles",
""
]
] | Detecting thermal Unruh radiation from accelerated electrons has presented a formidable challenge due not only to technical difficulties but also for lack of conceptual clarity about what is actually seen by a laboratory observer. We give a summary of the current interpretations along with a simpler heuristic descripti... |
2402.10622 | Waleed Sherif | Hanno Sahlmann, Waleed Sherif | Towards quantum gravity with neural networks: Solving the quantum
Hamilton constraint of U(1) BF theory | 35 pages, 9 figures | null | null | null | gr-qc hep-th physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the canonical approach of loop quantum gravity, arguably the most
important outstanding problem is finding and interpreting solutions to the
Hamiltonian constraint. In this work, we demonstrate that methods of machine
learning are in principle applicable to this problem. We consider U(1) BF
theory in 3 dimensions,... | [
{
"created": "Fri, 16 Feb 2024 12:16:04 GMT",
"version": "v1"
}
] | 2024-02-19 | [
[
"Sahlmann",
"Hanno",
""
],
[
"Sherif",
"Waleed",
""
]
] | In the canonical approach of loop quantum gravity, arguably the most important outstanding problem is finding and interpreting solutions to the Hamiltonian constraint. In this work, we demonstrate that methods of machine learning are in principle applicable to this problem. We consider U(1) BF theory in 3 dimensions, q... |
2309.14100 | Salvador Mengual Sendra | Juan Antonio S\'aez, Salvador Mengual and Joan Josep Ferrando | Dimension of the isometry group in spacetimes with an invariant frame | 19 pages, 1 figure | Class. Quantum Grav. 40 205020 (2023) | 10.1088/1361-6382/acf98b | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The necessary and sufficient conditions for a spacetime with an invariant
frame to admit a group of isometries of dimension $r$ are given in terms of the
connection tensor $H$ associated with this frame. In Petrov-Bel types I, II and
III, and in other spacetimes where an invariant frame algebraically defined by
the c... | [
{
"created": "Mon, 25 Sep 2023 12:50:48 GMT",
"version": "v1"
}
] | 2023-09-26 | [
[
"Sáez",
"Juan Antonio",
""
],
[
"Mengual",
"Salvador",
""
],
[
"Ferrando",
"Joan Josep",
""
]
] | The necessary and sufficient conditions for a spacetime with an invariant frame to admit a group of isometries of dimension $r$ are given in terms of the connection tensor $H$ associated with this frame. In Petrov-Bel types I, II and III, and in other spacetimes where an invariant frame algebraically defined by the cur... |
2106.15290 | Deaglan Bartlett | Deaglan J. Bartlett, Dexter Bergsdal, Harry Desmond, Pedro G.
Ferreira, Jens Jasche | Constraints on Equivalence Principle Violation from Gamma Ray Bursts | 14 pages, 7 figures, 3 tables, accepted for publication in Physical
Review D | Phys. Rev. D 104, 084025 (2021) | 10.1103/PhysRevD.104.084025 | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories of gravity that obey the Weak Equivalence Principle have the same
Parametrised Post-Newtonian parameter $\gamma$ for all particles at all
energies. The large Shapiro time delays of extragalactic sources allow us to
put tight constraints on differences in $\gamma$ between photons of different
frequencies from... | [
{
"created": "Tue, 29 Jun 2021 12:04:06 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2021 15:48:14 GMT",
"version": "v2"
}
] | 2021-10-06 | [
[
"Bartlett",
"Deaglan J.",
""
],
[
"Bergsdal",
"Dexter",
""
],
[
"Desmond",
"Harry",
""
],
[
"Ferreira",
"Pedro G.",
""
],
[
"Jasche",
"Jens",
""
]
] | Theories of gravity that obey the Weak Equivalence Principle have the same Parametrised Post-Newtonian parameter $\gamma$ for all particles at all energies. The large Shapiro time delays of extragalactic sources allow us to put tight constraints on differences in $\gamma$ between photons of different frequencies from s... |
gr-qc/0403066 | Daniel Pollack | Piotr T. Chrusciel, James Isenberg, Daniel Pollack | Initial data engineering | Final published version, CMP. 19 pages | Commun.Math.Phys.257:29-42,2005 | 10.1007/s00220-005-1345-2 | null | gr-qc math.DG | null | We present a local gluing construction for general relativistic initial data
sets. The method applies to generic initial data, in a sense which is made
precise. In particular the trace of the extrinsic curvature is not assumed to
be constant near the gluing points, which was the case for previous such
constructions. ... | [
{
"created": "Mon, 15 Mar 2004 19:43:42 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2005 22:49:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chrusciel",
"Piotr T.",
""
],
[
"Isenberg",
"James",
""
],
[
"Pollack",
"Daniel",
""
]
] | We present a local gluing construction for general relativistic initial data sets. The method applies to generic initial data, in a sense which is made precise. In particular the trace of the extrinsic curvature is not assumed to be constant near the gluing points, which was the case for previous such constructions. No... |
1102.3434 | Jonas Mureika | Jonas R. Mureika and Dejan Stojkovic | Detecting Vanishing Dimensions Via Primordial Gravitational Wave
Astronomy | Somewhat expanded version with discussions that could not fit into
the PRL version; references added | Phys.Rev.Lett.106:101101,2011 | 10.1103/PhysRevLett.106.101101 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lower-dimensionality at higher energies has manifold theoretical advantages
as recently pointed out. Moreover, it appears that experimental evidence may
already exists for it - a statistically significant planar alignment of events
with energies higher than TeV has been observed in some earlier cosmic ray
experiments... | [
{
"created": "Wed, 16 Feb 2011 21:00:09 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2011 16:22:39 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Mureika",
"Jonas R.",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | Lower-dimensionality at higher energies has manifold theoretical advantages as recently pointed out. Moreover, it appears that experimental evidence may already exists for it - a statistically significant planar alignment of events with energies higher than TeV has been observed in some earlier cosmic ray experiments. ... |
gr-qc/9410039 | null | S. Kolitch and B. Hall | Dynamical Systems Treatment of Scalar Field Cosmologies | 9 pages, Latex, UCSBTH-94-43 | null | null | null | gr-qc | null | The conformal equivalence of some cosmological models in Brans-Dicke theory
to general relativistic cosmologies with a scalar field is discussed. In the
case of radiation-dominated universes, it is shown that the presence of the
scalar field has a negligible impact upon the evolution of the models in the
Einstein fra... | [
{
"created": "Fri, 28 Oct 1994 00:10:01 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Kolitch",
"S.",
""
],
[
"Hall",
"B.",
""
]
] | The conformal equivalence of some cosmological models in Brans-Dicke theory to general relativistic cosmologies with a scalar field is discussed. In the case of radiation-dominated universes, it is shown that the presence of the scalar field has a negligible impact upon the evolution of the models in the Einstein frame... |
1512.06756 | James W. York Jr. | James W. York | Stationary Point of the Hilbert Action Principle | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hilbert action principle for the Einstein equations has two boundary
terms that must be subtracted in order to obtain a true stationary point. In
this paper, I obtain both of them.
| [
{
"created": "Fri, 18 Dec 2015 00:18:50 GMT",
"version": "v1"
}
] | 2015-12-22 | [
[
"York",
"James W.",
""
]
] | The Hilbert action principle for the Einstein equations has two boundary terms that must be subtracted in order to obtain a true stationary point. In this paper, I obtain both of them. |
1302.6953 | Pablo Laguna | James Healy, Pablo Laguna, Larne Pekowsky, Deirdre Shoemaker | Template Mode Hierarchies for Binary Black Hole Mergers | 12 pages, 6 figures, 4 tables, replaced to match published version | null | 10.1103/PhysRevD.88.024034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Matched filtering is a popular data analysis framework used to search for
gravitational wave signals emitted by compact object binaries. The templates
used in matched filtering searches are constructed predominantly from the
quadrupolar mode because this mode is the energetically most dominant channel.
However, for h... | [
{
"created": "Wed, 27 Feb 2013 18:38:07 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2013 18:11:12 GMT",
"version": "v2"
}
] | 2013-08-13 | [
[
"Healy",
"James",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Pekowsky",
"Larne",
""
],
[
"Shoemaker",
"Deirdre",
""
]
] | Matched filtering is a popular data analysis framework used to search for gravitational wave signals emitted by compact object binaries. The templates used in matched filtering searches are constructed predominantly from the quadrupolar mode because this mode is the energetically most dominant channel. However, for hig... |
1708.02117 | Leandros Perivolaropoulos | Ioannis Antoniou and Leandros Perivolaropoulos | Constraints on Spatially Oscillating Sub-mm Forces from the Stanford
Levitated Microsphere Experiment Data | 15 pages, 12 Figures. References added/updated. The Mathematica files
used for the numerical analysis and the production of the figures may be
downloaded from http://leandros.physics.uoi.gr/solme/ | Phys. Rev. D 96, 104002 (2017) | 10.1103/PhysRevD.96.104002 | null | gr-qc astro-ph.CO hep-ex hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent analysis by one of the authors\cite{Perivolaropoulos:2016ucs} has
indicated the presence of a $2\sigma$ signal of spatially oscillating new force
residuals in the torsion balance data of the Washington experiment. We extend
that study and analyse the data of the Stanford Optically Levitated Microsphere
Exper... | [
{
"created": "Mon, 7 Aug 2017 13:46:27 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Aug 2017 11:17:05 GMT",
"version": "v2"
}
] | 2017-11-08 | [
[
"Antoniou",
"Ioannis",
""
],
[
"Perivolaropoulos",
"Leandros",
""
]
] | A recent analysis by one of the authors\cite{Perivolaropoulos:2016ucs} has indicated the presence of a $2\sigma$ signal of spatially oscillating new force residuals in the torsion balance data of the Washington experiment. We extend that study and analyse the data of the Stanford Optically Levitated Microsphere Experim... |
1007.3942 | Olivier Minazzoli | Olivier Minazzoli and Bertrand Chauvineau | Scalar-tensor propagation of light in the inner solar system at the
millimetric level | 18 pages, This article can be regarded as an extension of "eprint
arXiv:1003.1889" | Class.Quant.Grav.28:085010,2011 | 10.1088/0264-9381/28/8/085010 | null | gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper [1], motivated by forthcoming space experiments involving
propagation of light in the Solar System, we have proposed an extention of the
IAU metric equations at the c-4 level in General Relativity. However,
scalar-tensor theories may induce corrections numerically comparable to the c-4
general relat... | [
{
"created": "Thu, 22 Jul 2010 16:57:08 GMT",
"version": "v1"
}
] | 2011-07-28 | [
[
"Minazzoli",
"Olivier",
""
],
[
"Chauvineau",
"Bertrand",
""
]
] | In a recent paper [1], motivated by forthcoming space experiments involving propagation of light in the Solar System, we have proposed an extention of the IAU metric equations at the c-4 level in General Relativity. However, scalar-tensor theories may induce corrections numerically comparable to the c-4 general relativ... |
gr-qc/0003058 | S. Shankarnarayanan | S.Shankaranarayanan and T. Padmanabhan (IUCAA) | Hypothesis of path integral duality: Applications to QED | 15 pages, LaTeX2e (uses ijmpd.sty); To appear in IJMP-D; References
added | Int.J.Mod.Phys.D10:351-366,2001 | 10.1142/S0218271801000901 | IUCAA-12/2000 | gr-qc hep-th | null | We use the modified propagator for quantum field based on a ``principle of
path integral duality" proposed earlier in a paper by Padmanabhan to
investigate several results in QED. This procedure modifies the Feynman
propagator by the introduction of a fundamental length scale. We use this
modified propagator for the ... | [
{
"created": "Wed, 15 Mar 2000 08:53:00 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2001 05:26:34 GMT",
"version": "v2"
}
] | 2011-09-01 | [
[
"Shankaranarayanan",
"S.",
"",
"IUCAA"
],
[
"Padmanabhan",
"T.",
"",
"IUCAA"
]
] | We use the modified propagator for quantum field based on a ``principle of path integral duality" proposed earlier in a paper by Padmanabhan to investigate several results in QED. This procedure modifies the Feynman propagator by the introduction of a fundamental length scale. We use this modified propagator for the Di... |
1706.07722 | Joseph Ntahompagaze | Joseph Ntahompagaze and Amare Abebe and Manasse Mbonye | On $f(R)$ gravity in scalar-tensor theories | 27 pages, 7 figures, Published in IJGMMP | IJGMMP Vol. 14, No. 7 (2017) 1750107 | 10.1142/S0219887817501079 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study $f(R)$ gravity models in the language of scalar-tensor theories. The
correspondence between $f(R)$ gravity and scalar-tensor theories is revisited
since $f(R)$ gravity is a subclass of Brans-Dicke models, with a vanishing
coupling constant ($\omega=0$). In this treatment, four $f(R)$ toy models are
used to a... | [
{
"created": "Fri, 23 Jun 2017 14:29:02 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2017 11:14:10 GMT",
"version": "v2"
}
] | 2017-06-28 | [
[
"Ntahompagaze",
"Joseph",
""
],
[
"Abebe",
"Amare",
""
],
[
"Mbonye",
"Manasse",
""
]
] | We study $f(R)$ gravity models in the language of scalar-tensor theories. The correspondence between $f(R)$ gravity and scalar-tensor theories is revisited since $f(R)$ gravity is a subclass of Brans-Dicke models, with a vanishing coupling constant ($\omega=0$). In this treatment, four $f(R)$ toy models are used to ana... |
1406.3046 | Valery Kiselev | Ja.V. Balitsky, V.V. Kiselev | Quantum origin of suppression for vacuum fluctuations of energy | 10 pages, revTeX4; comments and references added | Phys. Rev. D 90, 125017 (2014) | 10.1103/PhysRevD.90.125017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By example of a model with a spatially global scalar field, we show that the
energy density of zero-point modes is exponentially suppressed by an average
number of field quanta in a finite volume with respect to the energy density in
the stationary state of minimal energy. We describe cosmological implications
of mec... | [
{
"created": "Tue, 10 Jun 2014 11:22:25 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 2014 13:40:16 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Aug 2014 13:03:05 GMT",
"version": "v3"
},
{
"created": "Wed, 3 Dec 2014 06:26:19 GMT",
"version": "v4"
}
] | 2014-12-24 | [
[
"Balitsky",
"Ja. V.",
""
],
[
"Kiselev",
"V. V.",
""
]
] | By example of a model with a spatially global scalar field, we show that the energy density of zero-point modes is exponentially suppressed by an average number of field quanta in a finite volume with respect to the energy density in the stationary state of minimal energy. We describe cosmological implications of mecha... |
1704.06992 | Michael Reisenberger | Andreas Fuchs and Michael Reisenberger | Integrable structures and the quantization of free null initial data for
gravity | 40 pages, 4 figures | null | 10.1088/1361-6382/aa7d2b | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Variables for constraint free null canonical vacuum general relativity are
presented which have simple Poisson brackets that facilitate quantization. Free
initial data for vacuum general relativity on a pair of intersecting null
hypersurfaces has been known since the 1960s. These consist of the "main" data
which are ... | [
{
"created": "Sun, 23 Apr 2017 22:27:15 GMT",
"version": "v1"
}
] | 2017-09-06 | [
[
"Fuchs",
"Andreas",
""
],
[
"Reisenberger",
"Michael",
""
]
] | Variables for constraint free null canonical vacuum general relativity are presented which have simple Poisson brackets that facilitate quantization. Free initial data for vacuum general relativity on a pair of intersecting null hypersurfaces has been known since the 1960s. These consist of the "main" data which are se... |
1504.02579 | Alan Cornell | C.-H. Chen, H. T. Cho, A. S. Cornell, G. Harmsen, and Wade Naylor | Gravitino fields in Schwarzschild black hole spacetimes | 21 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1006.3327 by other authors | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analysis of gravitino fields in curved spacetimes is usually carried out
using the Newman-Penrose formalism. In this paper we consider a more direct
approach with eigenspinor-vectors on spheres, to separate out the angular parts
of the fields in a Schwarzschild background. The radial equations of the
correspondin... | [
{
"created": "Fri, 10 Apr 2015 08:12:40 GMT",
"version": "v1"
}
] | 2015-04-16 | [
[
"Chen",
"C. -H.",
""
],
[
"Cho",
"H. T.",
""
],
[
"Cornell",
"A. S.",
""
],
[
"Harmsen",
"G.",
""
],
[
"Naylor",
"Wade",
""
]
] | The analysis of gravitino fields in curved spacetimes is usually carried out using the Newman-Penrose formalism. In this paper we consider a more direct approach with eigenspinor-vectors on spheres, to separate out the angular parts of the fields in a Schwarzschild background. The radial equations of the corresponding ... |
2005.00747 | Jun Tao | Qiuhong Chen, Wei Hong, Jun Tao | Universal thermodynamic extremality relations for charged AdS black hole
surrounded by quintessence | null | null | null | CTP-SCU/2020018 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The perturbation correction of general relativity has obtained the general
relationship between entropy and extremality. The relation was found to exactly
hold for the charged AdS black hole, and extended to the rotating and massive
gravity black holes. In this paper, We confirm the universal relation for the
four di... | [
{
"created": "Sat, 2 May 2020 08:22:23 GMT",
"version": "v1"
}
] | 2020-05-05 | [
[
"Chen",
"Qiuhong",
""
],
[
"Hong",
"Wei",
""
],
[
"Tao",
"Jun",
""
]
] | The perturbation correction of general relativity has obtained the general relationship between entropy and extremality. The relation was found to exactly hold for the charged AdS black hole, and extended to the rotating and massive gravity black holes. In this paper, We confirm the universal relation for the four dime... |
1901.00805 | Francisco Lobo | Francisco S.N. Lobo, Tiberiu Harko, Tomi S. Koivisto, Gonzalo J. Olmo,
Diego Rubiera-Garcia | Novel couplings between nonmetricity and matter | 6 pages, talk delivered at the AT1 parallel session, "Extended
Theories of Gravity and Quantum Cosmology", of the 15th Marcel Grossmann
Meeting 2018 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel theory of gravity, namely, an extension of symmetric
teleparallel gravity. This is done by introducing a new class of theories where
the nonmetricity $Q$ is coupled nonminimally to the matter Lagrangian. This
nonminimal coupling entails the nonconservation of the energy-momentum tensor,
and consequ... | [
{
"created": "Thu, 3 Jan 2019 16:17:11 GMT",
"version": "v1"
}
] | 2019-01-04 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Koivisto",
"Tomi S.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] | We present a novel theory of gravity, namely, an extension of symmetric teleparallel gravity. This is done by introducing a new class of theories where the nonmetricity $Q$ is coupled nonminimally to the matter Lagrangian. This nonminimal coupling entails the nonconservation of the energy-momentum tensor, and consequen... |
1404.2726 | Vyacheslav Ivanovich Dokuchaev | V. A. Berezin and V. I. Dokuchaev | Global geometry of space-time with the charged shell | 76 pages, 62 figures | null | null | Preprint INR RAS 1343/2013 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is elaborated the complete classification of the possible types of the
spherically symmetric global geometries for two types of electrically charged
shells: (1) The charged shell as a single source of the gravitational field,
when internal space-time is flat, and external space-time is the
Reissner--Nordstr\"om me... | [
{
"created": "Thu, 10 Apr 2014 08:20:13 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Berezin",
"V. A.",
""
],
[
"Dokuchaev",
"V. I.",
""
]
] | It is elaborated the complete classification of the possible types of the spherically symmetric global geometries for two types of electrically charged shells: (1) The charged shell as a single source of the gravitational field, when internal space-time is flat, and external space-time is the Reissner--Nordstr\"om metr... |
gr-qc/0604098 | Lukasz Bratek | Lukasz Bratek, Joanna Jalocha, Marek Kutschera | A class of space-times of non-rigidly rotating dust | null | ActaPhys.Polon.B38:2513,2007 | null | null | gr-qc astro-ph | null | We find a class of exact solutions of differentially rotating dust in the
framework of General Relativity. There exist asymptotically flat space-times of
the flow with positive mass function that for radii sufficiently large is
monotonic and tends to zero at infinity. Some of the space-times may have
non-vanishing to... | [
{
"created": "Fri, 21 Apr 2006 20:38:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bratek",
"Lukasz",
""
],
[
"Jalocha",
"Joanna",
""
],
[
"Kutschera",
"Marek",
""
]
] | We find a class of exact solutions of differentially rotating dust in the framework of General Relativity. There exist asymptotically flat space-times of the flow with positive mass function that for radii sufficiently large is monotonic and tends to zero at infinity. Some of the space-times may have non-vanishing tota... |
1212.2434 | Emanuel Gallo | Emanuel Gallo, Osvaldo M. Moreschi | Explicit expressions for optical scalars in gravitational lensing from
general matter sources | Talk presented at the Conference I COSMOSUL (2011) (COSMOLOGY AND
GRAVITATION IN THE SOUTHERN CONE) | I COSMOSUL: COSMOLOGY AND GRAVITATION IN THE SOUTHERN CONE. AIP
Conference Proceedings, Volume 1471, pp. 82-87 (2012) | 10.1063/1.4756817 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present explicit expressions for the optical scalars and the deection
angle in terms of the energymomentum tensor components of matter distributions.
Our work generalizes standard references in the literature where normally
stringent assumptions are made on the sources.
| [
{
"created": "Tue, 11 Dec 2012 15:39:45 GMT",
"version": "v1"
}
] | 2012-12-12 | [
[
"Gallo",
"Emanuel",
""
],
[
"Moreschi",
"Osvaldo M.",
""
]
] | We present explicit expressions for the optical scalars and the deection angle in terms of the energymomentum tensor components of matter distributions. Our work generalizes standard references in the literature where normally stringent assumptions are made on the sources. |
gr-qc/0511139 | Woei Chet Lim | Woei Chet Lim, Claes Uggla, John Wainwright | Asymptotic silence-breaking singularities | 25 pages, 6 figures | Class.Quant.Grav. 23 (2006) 2607-2630 | 10.1088/0264-9381/23/7/023 | null | gr-qc | null | We discuss three complementary aspects of scalar curvature singularities:
asymptotic causal properties, asymptotic Ricci and Weyl curvature, and
asymptotic spatial properties. We divide scalar curvature singularities into
two classes: so-called asymptotically silent singularities and non-generic
singularities that br... | [
{
"created": "Fri, 25 Nov 2005 19:23:08 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Feb 2006 16:06:46 GMT",
"version": "v2"
}
] | 2016-10-17 | [
[
"Lim",
"Woei Chet",
""
],
[
"Uggla",
"Claes",
""
],
[
"Wainwright",
"John",
""
]
] | We discuss three complementary aspects of scalar curvature singularities: asymptotic causal properties, asymptotic Ricci and Weyl curvature, and asymptotic spatial properties. We divide scalar curvature singularities into two classes: so-called asymptotically silent singularities and non-generic singularities that brea... |
2306.16447 | Thomas Spieksma | Thomas F.M. Spieksma, Enrico Cannizzaro, Taishi Ikeda, Vitor Cardoso,
Yifan Chen | Superradiance: Axionic Couplings and Plasma Effects | 33 pages, 24 figures; references and figure added | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spinning black holes can transfer a significant fraction of their energy to
ultralight bosonic fields via superradiance, condensing them in a co-rotating
structure or "cloud". This mechanism turns black holes into powerful particle
detectors for bosons with extremely feeble interactions. To explore its full
potential... | [
{
"created": "Wed, 28 Jun 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2023 15:13:10 GMT",
"version": "v2"
}
] | 2023-08-30 | [
[
"Spieksma",
"Thomas F. M.",
""
],
[
"Cannizzaro",
"Enrico",
""
],
[
"Ikeda",
"Taishi",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Chen",
"Yifan",
""
]
] | Spinning black holes can transfer a significant fraction of their energy to ultralight bosonic fields via superradiance, condensing them in a co-rotating structure or "cloud". This mechanism turns black holes into powerful particle detectors for bosons with extremely feeble interactions. To explore its full potential, ... |
1807.00308 | Dipti Kapse | S.D. Katore and D.V. Kapse | Bianchi type-I dark energy cosmology with power-law relation in
Brans-Dicke theory of gravitation | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have studied the interacting and non-interacting dark
energy and dark matter in the spatially homogenous and anisotropic Bianchi
type-I model in the Brans- Dicke theory of gravitation. The field equations
have been solved by using (i) power-law relation and (ii) by assuming scale
factor in terms of ... | [
{
"created": "Sun, 1 Jul 2018 10:48:21 GMT",
"version": "v1"
}
] | 2018-07-03 | [
[
"Katore",
"S. D.",
""
],
[
"Kapse",
"D. V.",
""
]
] | In this paper, we have studied the interacting and non-interacting dark energy and dark matter in the spatially homogenous and anisotropic Bianchi type-I model in the Brans- Dicke theory of gravitation. The field equations have been solved by using (i) power-law relation and (ii) by assuming scale factor in terms of re... |
gr-qc/0505123 | Mauricio Bellini | Mariano Anabitarte (Mar del Plata University & CONICET), Jose Edgar
Madriz Aguilar (IFM, Michoacana University), Mauricio Bellini (Mar del Plata
University & CONICET) | Inflaton field governed universe from NKK theory of gravity: stochastic
approach | accepted in European Physical Journal C | Eur.Phys.J.C45:249-256,2006 | 10.1140/epjc/s2005-02404-9 | null | gr-qc astro-ph hep-ph hep-th | null | We study a nonperturbative single field (inflaton) governed cosmological
model from a 5D Noncompact Kaluza-Klein (NKK) theory of gravity. The inflaton
field fluctuations are estimated for different epochs of the evolution of the
universe. We conclude that the inflaton field has been sliding down its
(quadratic) poten... | [
{
"created": "Tue, 24 May 2005 18:35:29 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jul 2005 21:31:10 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Sep 2005 19:18:33 GMT",
"version": "v3"
},
{
"created": "Tue, 13 Sep 2005 16:48:02 GMT",
"version": "v4"
}
] | 2009-01-07 | [
[
"Anabitarte",
"Mariano",
"",
"Mar del Plata University & CONICET"
],
[
"Aguilar",
"Jose Edgar Madriz",
"",
"IFM, Michoacana University"
],
[
"Bellini",
"Mauricio",
"",
"Mar del Plata\n University & CONICET"
]
] | We study a nonperturbative single field (inflaton) governed cosmological model from a 5D Noncompact Kaluza-Klein (NKK) theory of gravity. The inflaton field fluctuations are estimated for different epochs of the evolution of the universe. We conclude that the inflaton field has been sliding down its (quadratic) potenti... |
1511.01435 | Nathan Musoke | N. K. Musoke and D. D. McNutt and A. A. Coley and D. A. Brooks | On scalar curvature invariants in three dimensional spacetimes | 24 pages. Minor changes, version as published in General Relativity
and Gravitation | null | 10.1007/s10714-016-2022-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We wish to construct a minimal set of algebraically independent scalar
curvature invariants formed by the contraction of the Riemann (Ricci) tensor
and its covariant derivatives up to some order of differentiation in three
dimensional (3D) Lorentzian spacetimes. In order to do this we utilize the
Cartan-Karlhede equi... | [
{
"created": "Wed, 4 Nov 2015 19:01:22 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 2016 18:58:55 GMT",
"version": "v2"
}
] | 2016-02-12 | [
[
"Musoke",
"N. K.",
""
],
[
"McNutt",
"D. D.",
""
],
[
"Coley",
"A. A.",
""
],
[
"Brooks",
"D. A.",
""
]
] | We wish to construct a minimal set of algebraically independent scalar curvature invariants formed by the contraction of the Riemann (Ricci) tensor and its covariant derivatives up to some order of differentiation in three dimensional (3D) Lorentzian spacetimes. In order to do this we utilize the Cartan-Karlhede equiva... |
1802.01193 | Robert Hilborn | Robert C. Hilborn | GW170814: Gravitational wave polarization analysis | This version adds (1) enhanced analysis of the raw LIGO-Virgo strain
data and (2) Bayesian inference methods for testing polarization models | Class. Quantum Grav. 38 085003 2021 | 10.1088/1361-6382/abe9f4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To determine the polarization character of gravitational waves, we use strain
data from the GW170814 binary black hole coalescence event detected by the
three LIGO-Virgo observatories, extracting the gravitational wave strain signal
amplitude ratios directly from those data. Employing a geometric approach that
links ... | [
{
"created": "Sun, 4 Feb 2018 21:02:46 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2018 14:21:28 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Mar 2018 17:05:29 GMT",
"version": "v3"
},
{
"created": "Sat, 3 Aug 2019 18:49:33 GMT",
"version": "v4"
}
] | 2021-07-07 | [
[
"Hilborn",
"Robert C.",
""
]
] | To determine the polarization character of gravitational waves, we use strain data from the GW170814 binary black hole coalescence event detected by the three LIGO-Virgo observatories, extracting the gravitational wave strain signal amplitude ratios directly from those data. Employing a geometric approach that links th... |
gr-qc/0107035 | Robert D. Klauber | Robert D. Klauber | Generalized Tensor Analysis Method Applied to Non-time-orthogonal
Coordinate Frames | 9 pages. Revision corrects minor typos and modifies introduction | null | null | null | gr-qc | null | A generalized covariant method of analysis applicable to frames for which
time is not orthogonal to space, such as spacetime around a star possessing
angular momentum or on a rotating disk, is presented. Important aspects of such
an analysis are shown to include i) use of the physically relevant
contravariant or cova... | [
{
"created": "Tue, 10 Jul 2001 21:35:11 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2005 17:03:47 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Klauber",
"Robert D.",
""
]
] | A generalized covariant method of analysis applicable to frames for which time is not orthogonal to space, such as spacetime around a star possessing angular momentum or on a rotating disk, is presented. Important aspects of such an analysis are shown to include i) use of the physically relevant contravariant or covari... |
2303.00812 | Lorenzo Iorio | Lorenzo Iorio, Athul P. Girija, Daniele Durante | One EURO for Uranus: the Elliptical Uranian Relativity Orbiter mission | LaTex2e, 40 pages, 7 figures, no tables. Minor revisions. Accepted in
Monthly Notices of the Royal Astronomical Society | Mon.Not.Roy.Astron.Soc.523:3595-3614,2023 | 10.1093/mnras/stad1446 | null | gr-qc astro-ph.EP astro-ph.IM physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent years have seen increasing interest in sending a mission to Uranus,
visited so far only by Voyager 2 in 1986. EURO (Elliptical Uranian Relativity
Orbiter) is a preliminary mission concept investigating the possibility of
dynamically measuring the planet's angular momentum by means of the
Lense-Thirring effect ... | [
{
"created": "Wed, 1 Mar 2023 20:28:17 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Apr 2023 16:07:42 GMT",
"version": "v2"
},
{
"created": "Thu, 11 May 2023 11:40:35 GMT",
"version": "v3"
}
] | 2023-06-16 | [
[
"Iorio",
"Lorenzo",
""
],
[
"Girija",
"Athul P.",
""
],
[
"Durante",
"Daniele",
""
]
] | Recent years have seen increasing interest in sending a mission to Uranus, visited so far only by Voyager 2 in 1986. EURO (Elliptical Uranian Relativity Orbiter) is a preliminary mission concept investigating the possibility of dynamically measuring the planet's angular momentum by means of the Lense-Thirring effect af... |
1311.4301 | Alessandro Pluchino | M. Consoli and A. Pluchino | Gravity as an emergent phenomenon: experimental signatures | 13 pages, 4 figures. arXiv admin note: substantial text overlap with
arXiv:1204.6157, arXiv:1106.1277, arXiv:0912.0103 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to some authors, gravity might be an emergent phenomenon in a
fundamentally flat space-time. In this case the speed of light in the vacuum
would not coincide exactly with the basic parameter "c" entering Lorentz
transformations and, for an apparatus placed on the Earth's surface, light
should exhibit a tiny... | [
{
"created": "Mon, 18 Nov 2013 09:11:33 GMT",
"version": "v1"
}
] | 2013-11-19 | [
[
"Consoli",
"M.",
""
],
[
"Pluchino",
"A.",
""
]
] | According to some authors, gravity might be an emergent phenomenon in a fundamentally flat space-time. In this case the speed of light in the vacuum would not coincide exactly with the basic parameter "c" entering Lorentz transformations and, for an apparatus placed on the Earth's surface, light should exhibit a tiny f... |
0811.2948 | Alberto Rozas-Fernandez | Pedro F. Gonzalez-Diaz and Alberto Rozas-Fernandez | A gracious exit from the matter-dominated phase in a quantum cosmic
phantom model | 7 pages, no figures. Changes in the introduction and main body of the
article. Added references | Physics Letters B733 (2014) 84-88 | 10.1016/j.physletb.2014.04.018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most recent observational constraints coming from Planck, when combined
with other cosmological data, provide evidence for a phantom scenario. In this
work we consider a quantum cosmic phantom model where both the matter particles
and scalar field are associated with quantum potentials which make the
effective ma... | [
{
"created": "Tue, 18 Nov 2008 16:28:39 GMT",
"version": "v1"
},
{
"created": "Wed, 14 May 2014 23:09:37 GMT",
"version": "v2"
}
] | 2014-05-16 | [
[
"Gonzalez-Diaz",
"Pedro F.",
""
],
[
"Rozas-Fernandez",
"Alberto",
""
]
] | The most recent observational constraints coming from Planck, when combined with other cosmological data, provide evidence for a phantom scenario. In this work we consider a quantum cosmic phantom model where both the matter particles and scalar field are associated with quantum potentials which make the effective mass... |
1908.07986 | A. Hujeirat | A. A. Hujeirat, R. Samtaney | Glitching pulsars: unraveling the interactions of general relativity
with quantum fields in the strong field regimes | 19 pages, 11 figures, research article | null | 10.4236/jmp.2019.1014111 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a modification of our previous model for the mechanisms underlying
the glitch phenomena in pulsars and young neutron stars. Accordingly, pulsars
are born with embryonic cores comprising of purely incompressible
superconducting gluon-quark superfluid (henceforth SuSu-cores). As the ambient
medium cools and ... | [
{
"created": "Wed, 21 Aug 2019 16:57:06 GMT",
"version": "v1"
}
] | 2021-02-24 | [
[
"Hujeirat",
"A. A.",
""
],
[
"Samtaney",
"R.",
""
]
] | We present a modification of our previous model for the mechanisms underlying the glitch phenomena in pulsars and young neutron stars. Accordingly, pulsars are born with embryonic cores comprising of purely incompressible superconducting gluon-quark superfluid (henceforth SuSu-cores). As the ambient medium cools and sp... |
gr-qc/0112022 | Victor Berezin | V. Berezin (Inst. Nucl. Res. Russ. Acad. Sci., Moscow) | Towards a Theory of Quantum Black Hole | 14 pages. Talk given at the Fifth Workshop on Quantum Field Theory
under the Influence of External Conditions, Leipzig, 10-14 Sept., 2001 | Int.J.Mod.Phys. A17 (2002) 979-988 | 10.1142/S0217751X0201039X | null | gr-qc | null | We describe some specific quantum black hole model. It is pointed out that
the origin of a black hole entropy is the very process of quantum gravitational
collapse. The quantum black hole mass spectrum is extracted from the mass
spectrum of the gravitating source. The classical analog of quantum black hole
is constru... | [
{
"created": "Tue, 11 Dec 2001 14:21:52 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Berezin",
"V.",
"",
"Inst. Nucl. Res. Russ. Acad. Sci., Moscow"
]
] | We describe some specific quantum black hole model. It is pointed out that the origin of a black hole entropy is the very process of quantum gravitational collapse. The quantum black hole mass spectrum is extracted from the mass spectrum of the gravitating source. The classical analog of quantum black hole is construct... |
1708.00671 | Anuradha Samajdar | Anuradha Samajdar and K. G. Arun | Projected constraints on the dispersion of gravitational waves using
advanced ground- and space-based interferometers | 9 pages, 4 figures, 1 table | Phys. Rev. D 96, 104027 (2017) | 10.1103/PhysRevD.96.104027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Certain alternative theories of gravity predict that gravitational waves will
disperse as they travel from the source to the observer. The recent binary
black hole observations by Advanced-LIGO have set limits on a modified
dispersion relation from the constraints on their effects on gravitational-wave
propagation. U... | [
{
"created": "Wed, 2 Aug 2017 09:46:02 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Dec 2017 20:24:37 GMT",
"version": "v2"
}
] | 2017-12-05 | [
[
"Samajdar",
"Anuradha",
""
],
[
"Arun",
"K. G.",
""
]
] | Certain alternative theories of gravity predict that gravitational waves will disperse as they travel from the source to the observer. The recent binary black hole observations by Advanced-LIGO have set limits on a modified dispersion relation from the constraints on their effects on gravitational-wave propagation. Usi... |
gr-qc/0605138 | Andrzej Okolow | Andrzej Okolow | Quantization of diffeomorphism invariant theories of connections with a
non-compact structure group - an example | 59 pages, no figures, LaTeX2e, this is a shortened version published
in Comm. Math. Phys | Comm. Math. Phys. 289: 335-382, 2009 | 10.1007/s00220-009-0755-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple diffeomorphism invariant theory of connections with the non-compact
structure group R of real numbers is quantized. The theory is defined on a
four-dimensional 'space-time' by an action resembling closely the self-dual
Plebanski action for general relativity. The space of quantum states is
constructed by mea... | [
{
"created": "Mon, 29 May 2006 13:52:46 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Mar 2013 17:22:11 GMT",
"version": "v2"
}
] | 2013-04-02 | [
[
"Okolow",
"Andrzej",
""
]
] | A simple diffeomorphism invariant theory of connections with the non-compact structure group R of real numbers is quantized. The theory is defined on a four-dimensional 'space-time' by an action resembling closely the self-dual Plebanski action for general relativity. The space of quantum states is constructed by means... |
2308.14502 | Sohan Kumar Jha | Sohan Kumar Jha | Superradiance scattering of scalar, electromagnetic, and gravitational
fields and thin accretion disk around non-commutating Kerr black hole | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the non-commutative(NC) Kerr black hole where the mass of the
central object is smeared over a region of linear size $\sqrt{b}$, $b$ is the
strength of the NC character of spacetime. For the spacetime under
consideration, we calculate the amplification factor for scalar,
electromagnetic, and gravitational... | [
{
"created": "Mon, 28 Aug 2023 11:22:36 GMT",
"version": "v1"
}
] | 2023-08-29 | [
[
"Jha",
"Sohan Kumar",
""
]
] | We consider the non-commutative(NC) Kerr black hole where the mass of the central object is smeared over a region of linear size $\sqrt{b}$, $b$ is the strength of the NC character of spacetime. For the spacetime under consideration, we calculate the amplification factor for scalar, electromagnetic, and gravitational f... |
2001.05723 | Chi-Kit Cheong | Patrick Chi-Kit Cheong, Lap-Ming Lin, and Tjonnie Guang-Feng Li | Gmunu: Toward multigrid based Einstein field equations solver for
general-relativistic hydrodynamics simulations | null | Classical and Quantum Gravity, 2020, Volume 37, Number 14 | 10.1088/1361-6382/ab8e9c | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new open-source axisymmetric general relativistic hydrodynamics
code Gmunu (General-relativistic multigrid numerical solver) which uses a
multigrid method to solve the elliptic metric equations in the conformally flat
condition (CFC) approximation on a spherical grid. Most of the existing
relativistic hy... | [
{
"created": "Thu, 16 Jan 2020 10:07:47 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2020 11:39:44 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Sep 2020 08:30:43 GMT",
"version": "v3"
}
] | 2020-09-24 | [
[
"Cheong",
"Patrick Chi-Kit",
""
],
[
"Lin",
"Lap-Ming",
""
],
[
"Li",
"Tjonnie Guang-Feng",
""
]
] | We present a new open-source axisymmetric general relativistic hydrodynamics code Gmunu (General-relativistic multigrid numerical solver) which uses a multigrid method to solve the elliptic metric equations in the conformally flat condition (CFC) approximation on a spherical grid. Most of the existing relativistic hydr... |
gr-qc/0102048 | Roman R. Zapatrin | Ioannis Raptis, Roman R. Zapatrin | Algebraic description of spacetime foam | 34 pages, LaTeX2e, the section concerning classical spacetimes in the
limit essentially corrected | Class.Quant.Grav. 18 (2001) 4187-4212 | 10.1088/0264-9381/18/20/303 | null | gr-qc hep-th | null | A mathematical formalism for treating spacetime topology as a quantum
observable is provided. We describe spacetime foam entirely in algebraic terms.
To implement the correspondence principle we express the classical spacetime
manifold of general relativity and the commutative coordinates of its events by
means of ap... | [
{
"created": "Mon, 12 Feb 2001 16:58:42 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2001 16:02:14 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Raptis",
"Ioannis",
""
],
[
"Zapatrin",
"Roman R.",
""
]
] | A mathematical formalism for treating spacetime topology as a quantum observable is provided. We describe spacetime foam entirely in algebraic terms. To implement the correspondence principle we express the classical spacetime manifold of general relativity and the commutative coordinates of its events by means of appr... |
2108.11437 | Farhad Darabi | F. Gholami, F. Darabi, M. Mohammadi, S. Varsaie, M. Roshande | Einstein equations with cosmological constant in Super Space-Time | 14 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new kind of super warped product spaces
$\bar{M}_{_{(I)}}=\textbf{I}^{1|0}\times_f M^{m|n}$,
$\bar{M}_{_{(II)}}=\textbf{I}^{0|1}\times_{f} M^{m|n}$, and
$\bar{M}_{_{(III)}}=\textbf{I}^{1|1}\times_{f} M^{m|n}$, where $M^{m|n}$ is a
supermanifold of dimension $m|n$, $\textbf{I}^{\delta|\delta'}$ is stand... | [
{
"created": "Wed, 25 Aug 2021 19:04:48 GMT",
"version": "v1"
}
] | 2021-08-27 | [
[
"Gholami",
"F.",
""
],
[
"Darabi",
"F.",
""
],
[
"Mohammadi",
"M.",
""
],
[
"Varsaie",
"S.",
""
],
[
"Roshande",
"M.",
""
]
] | We introduce a new kind of super warped product spaces $\bar{M}_{_{(I)}}=\textbf{I}^{1|0}\times_f M^{m|n}$, $\bar{M}_{_{(II)}}=\textbf{I}^{0|1}\times_{f} M^{m|n}$, and $\bar{M}_{_{(III)}}=\textbf{I}^{1|1}\times_{f} M^{m|n}$, where $M^{m|n}$ is a supermanifold of dimension $m|n$, $\textbf{I}^{\delta|\delta'}$ is standar... |
gr-qc/9310031 | Chris Isham | C.J.Isham | Prima Facie Questions in Quantum Gravity | 20,IC/TP/01 | null | 10.1007/3-540-58339-4_13 | null | gr-qc | null | The long history of the study of quantum gravity has thrown up a complex web
of ideas and approaches. The aim of this article is to unravel this web a
little by analysing some of the {\em prima facie\/} questions that can be asked
of almost any approach to quantum gravity and whose answers assist in
classifying the d... | [
{
"created": "Fri, 22 Oct 1993 15:22:30 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Isham",
"C. J.",
""
]
] | The long history of the study of quantum gravity has thrown up a complex web of ideas and approaches. The aim of this article is to unravel this web a little by analysing some of the {\em prima facie\/} questions that can be asked of almost any approach to quantum gravity and whose answers assist in classifying the dif... |
1907.00403 | Vasilis Oikonomou | Shin'ichi Nojiri, S.D. Odintsov, V.K. Oikonomou, N. Chatzarakis,
Tanmoy Paul | Viable Inflationary Models in a Ghost-free Gauss-Bonnet Theory of
Gravity | EPJC Accepted | null | 10.1140/epjc/s10052-019-7080-1 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the inflationary phenomenological implications of
a recently developed ghost-free Gauss-Bonnet theory of gravity. The resulting
theory can be viewed as a scalar Einstein-Gauss-Bonnet theory of gravity, so by
employing the formalism for cosmological perturbations for the latter theory,
we c... | [
{
"created": "Sun, 30 Jun 2019 15:58:54 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Chatzarakis",
"N.",
""
],
[
"Paul",
"Tanmoy",
""
]
] | In this work we investigate the inflationary phenomenological implications of a recently developed ghost-free Gauss-Bonnet theory of gravity. The resulting theory can be viewed as a scalar Einstein-Gauss-Bonnet theory of gravity, so by employing the formalism for cosmological perturbations for the latter theory, we cal... |
2405.11060 | Antonio C. Guti\'errez-Pi\~neres | Antonio C. Guti\'errez-Pi\~neres and Hernando Quevedo | $C^3$ matching conditions for anisotropic fluids | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The $C^3$ approach is an invariant formalism that utilizes the eigenvalues of
the Riemann curvature tensor to match spacetimes across a specific matching
surface. We apply this approach to match an anisotropic fluid with an exterior
vacuum solution, including the case in which discontinuities appear on the
matching s... | [
{
"created": "Fri, 17 May 2024 19:25:13 GMT",
"version": "v1"
}
] | 2024-05-21 | [
[
"Gutiérrez-Piñeres",
"Antonio C.",
""
],
[
"Quevedo",
"Hernando",
""
]
] | The $C^3$ approach is an invariant formalism that utilizes the eigenvalues of the Riemann curvature tensor to match spacetimes across a specific matching surface. We apply this approach to match an anisotropic fluid with an exterior vacuum solution, including the case in which discontinuities appear on the matching sur... |
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