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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0901.2619 | Lars Andersson | Lars Andersson (AEI and UM) | The trapped region | talk given at ERE08, Salamanca. To appear in proceedings of ERE08.
v2: Minor typos fixed | AIP Conf.Proc.1122:3-11,2009 | 10.1063/1.3141337 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I will discuss some recent results on marginally outer trapped surfaces,
apparent horizons, and the trapped region. A couple of applications of the
results developed for marginally outer trapped surfaces to coalescence of black
holes and to the characterization of the trapped region are given.
| [
{
"created": "Sat, 17 Jan 2009 09:51:10 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jan 2009 08:16:57 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Andersson",
"Lars",
"",
"AEI and UM"
]
] | I will discuss some recent results on marginally outer trapped surfaces, apparent horizons, and the trapped region. A couple of applications of the results developed for marginally outer trapped surfaces to coalescence of black holes and to the characterization of the trapped region are given. |
0808.3505 | Carlo Rovelli | Carlo Rovelli | A note on DSR | 6 pages, 2 figures. (This is a note circulated privately for a
while.) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I study the physical meaning of Deformed, or Doubly, Special Relativity
(DSR). I argue that DSR could be physically relevant in a certain
large-distance limit. I consider a concrete physical effect: the gravitational
slowing down of time due to the gravitational potential well of a
massive-particle, and its effect on... | [
{
"created": "Tue, 26 Aug 2008 13:20:13 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Aug 2008 06:52:13 GMT",
"version": "v2"
}
] | 2008-08-29 | [
[
"Rovelli",
"Carlo",
""
]
] | I study the physical meaning of Deformed, or Doubly, Special Relativity (DSR). I argue that DSR could be physically relevant in a certain large-distance limit. I consider a concrete physical effect: the gravitational slowing down of time due to the gravitational potential well of a massive-particle, and its effect on t... |
gr-qc/0010008 | Vadim Malyshev | V. A. Malyshev | Critical Behaviour in a Planar Dynamical Triangulation Model with a
Boundary | 5 pages | null | null | null | gr-qc math-ph math.MP | null | We consider a canonical ensemble of dynamical triangulations of a
2-dimensional sphere with a hole where the number $N$ of triangles is fixed.
The Gibbs factor is $\exp (-\mu \sum \deg v)$ where $\deg v$ is the degree of
the vertex $v$ in the triangulation $T$. Rigorous proof is presented that the
free energy has one... | [
{
"created": "Tue, 3 Oct 2000 12:58:47 GMT",
"version": "v1"
}
] | 2011-12-07 | [
[
"Malyshev",
"V. A.",
""
]
] | We consider a canonical ensemble of dynamical triangulations of a 2-dimensional sphere with a hole where the number $N$ of triangles is fixed. The Gibbs factor is $\exp (-\mu \sum \deg v)$ where $\deg v$ is the degree of the vertex $v$ in the triangulation $T$. Rigorous proof is presented that the free energy has one s... |
gr-qc/0205055 | Dzhunushaliev Vladimir | V. Dzhunushaliev | Strings in the Einstein's paradigm of matter | changes in the text | Class.Quant.Grav. 19 (2002) 4817-4824 | 10.1088/0264-9381/19/19/302 | null | gr-qc hep-th nucl-ex | null | Spherically symmetric solutions with a flux of electric and magnetic fields
in Kaluza-Klein gravity are considered. It is shown that under the condition
(electric charge $q$) $\approx$ (magnetic charge $Q$) ($q>Q$) these solutions
are like a flux tube stretched between two Universes. The longitudinal size of
this tub... | [
{
"created": "Wed, 15 May 2002 02:42:42 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Aug 2002 15:17:12 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Dzhunushaliev",
"V.",
""
]
] | Spherically symmetric solutions with a flux of electric and magnetic fields in Kaluza-Klein gravity are considered. It is shown that under the condition (electric charge $q$) $\approx$ (magnetic charge $Q$) ($q>Q$) these solutions are like a flux tube stretched between two Universes. The longitudinal size of this tube ... |
1912.00325 | Jian-Hua He | Jian-hua He (NJU) | Simulating the scattering of low-frequency Gravitational Waves by
compact objects using the finite element method | 15 pages, 8 figures | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the wave effects of gravitational waves (GWs) using numerical
simulations with the finite element method (FEM) based on the publicly
available code {\it deal.ii}. We robustly test our code using a point source
monochromatic spherical wave. We examine not only the waveform observed by a
local observer b... | [
{
"created": "Sun, 1 Dec 2019 05:50:41 GMT",
"version": "v1"
}
] | 2019-12-04 | [
[
"He",
"Jian-hua",
"",
"NJU"
]
] | We investigate the wave effects of gravitational waves (GWs) using numerical simulations with the finite element method (FEM) based on the publicly available code {\it deal.ii}. We robustly test our code using a point source monochromatic spherical wave. We examine not only the waveform observed by a local observer but... |
2402.08880 | Fan Zhang | Fan Zhang, Lee Lindblom | Solving the Einstein Constraints Numerically on Compact Three-Manifolds
Using Hyperbolic Relaxation | 7 pages, 8 figures, to appear in PRD | Phys. Rev. D 109, 064002 (2024) | 10.1103/PhysRevD.109.064002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effectiveness of the hyperbolic relaxation method for solving the
Einstein constraint equations numerically is studied here on a variety of
compact orientable three-manifolds. Convergent numerical solutions are found
using this method on manifolds admitting negative Ricci scalar curvature
metrics, i.e. those from... | [
{
"created": "Wed, 14 Feb 2024 01:09:19 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Zhang",
"Fan",
""
],
[
"Lindblom",
"Lee",
""
]
] | The effectiveness of the hyperbolic relaxation method for solving the Einstein constraint equations numerically is studied here on a variety of compact orientable three-manifolds. Convergent numerical solutions are found using this method on manifolds admitting negative Ricci scalar curvature metrics, i.e. those from t... |
gr-qc/0203065 | Robin Booth | Robin Booth | Scale invariant gravity and the quasi-static universe | null | null | null | Imperial/TP/1-02/18 | gr-qc | null | We highlight the fact that the lack of scale invariance in the gravitational
field equations of General Relativity results from the underlying assumption
that the appropriate scale for the gravitational force should be linked to the
atomic scale. We show that many of the problems associated with cosmology and
quantum... | [
{
"created": "Tue, 19 Mar 2002 23:15:54 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Apr 2002 16:16:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Booth",
"Robin",
""
]
] | We highlight the fact that the lack of scale invariance in the gravitational field equations of General Relativity results from the underlying assumption that the appropriate scale for the gravitational force should be linked to the atomic scale. We show that many of the problems associated with cosmology and quantum g... |
1107.3484 | Cristian Stelea | Cristian Stelea, Ciprian Dariescu and Marina-Aura Dariescu | Static charged double-black rings in five dimensions | 13 pages, To appear in Phys. Rev. D | Phys.Rev.D84:044009,2011 | 10.1103/PhysRevD.84.044009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a solution generating technique based on the symmetries of the
dimensionally reduced Lagrangian we derive two exact solutions of the
Einstein-Maxwell-Dilaton field equations in five dimensions. More specifically,
these solutions describe general systems of non-extremally charged static
asymptotically flat black... | [
{
"created": "Mon, 18 Jul 2011 16:00:12 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Stelea",
"Cristian",
""
],
[
"Dariescu",
"Ciprian",
""
],
[
"Dariescu",
"Marina-Aura",
""
]
] | Using a solution generating technique based on the symmetries of the dimensionally reduced Lagrangian we derive two exact solutions of the Einstein-Maxwell-Dilaton field equations in five dimensions. More specifically, these solutions describe general systems of non-extremally charged static asymptotically flat black b... |
gr-qc/9310012 | Thomas Thiemann | T. Thiemann, H.A. Kastrup | Canonical Quantization of Spherically Symmetric Gravity in Ashtekar's
Self-Dual Representation | 43 pages | Nucl.Phys.B399:211-258,1993 | 10.1016/0550-3213(93)90623-W | PITHA 92-23 June 92 | gr-qc | null | We show that the quantization of spherically symmetric pure gravity can be
carried out completely in the framework of Ashtekar's self-dual representation.
Consistent operator orderings can be given for the constraint functionals
yielding two kinds of solutions for the constraint equations, corresponding
classically t... | [
{
"created": "Thu, 7 Oct 1993 02:04:48 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Thiemann",
"T.",
""
],
[
"Kastrup",
"H. A.",
""
]
] | We show that the quantization of spherically symmetric pure gravity can be carried out completely in the framework of Ashtekar's self-dual representation. Consistent operator orderings can be given for the constraint functionals yielding two kinds of solutions for the constraint equations, corresponding classically to ... |
2110.01317 | Gaoping Long | Gaoping Long, Xiangdong Zhang, Cong Zhang | Twisted geometry coherent states in all dimensional loop quantum
gravity: I. Construction and Peakedness properties | null | Phys. Rev. D 105, 066021 (2022) | 10.1103/PhysRevD.105.066021 | null | gr-qc hep-lat math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/4.0/ | A new family of coherent states for all dimensional loop quantum gravity are
proposed, which is based on the generalized twisted geometry parametrization of
the phase space of $SO(D+1)$ connection theory. We prove that this family of
coherent states provide an over-complete basis of the Hilbert space in which
edge si... | [
{
"created": "Mon, 4 Oct 2021 10:54:10 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2021 12:24:32 GMT",
"version": "v2"
}
] | 2022-04-27 | [
[
"Long",
"Gaoping",
""
],
[
"Zhang",
"Xiangdong",
""
],
[
"Zhang",
"Cong",
""
]
] | A new family of coherent states for all dimensional loop quantum gravity are proposed, which is based on the generalized twisted geometry parametrization of the phase space of $SO(D+1)$ connection theory. We prove that this family of coherent states provide an over-complete basis of the Hilbert space in which edge simp... |
2310.15143 | Manuel Tiglio | Franco Cerino, Andr\'es Diaz-Pace, Emmanuel Tassone, Manuel Tiglio,
Atuel Villegas | Hyperparameter optimization of hp-greedy reduced basis for gravitational
wave surrogates | This paper is an invited contribution to the Special Issue "Recent
Advances in Gravity: A Themed Issue in Honor of Prof. Jorge Pullin on his
60th Anniversary'' | null | null | null | gr-qc astro-ph.IM cs.LG math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In a previous work we introduced, in the context of gravitational wave
science, an initial study on an automated domain-decomposition approach for
reduced basis through hp-greedy refinement. The approach constructs local
reduced bases of lower dimensionality than global ones, with the same or higher
accuracy. These `... | [
{
"created": "Mon, 23 Oct 2023 17:48:11 GMT",
"version": "v1"
}
] | 2023-10-24 | [
[
"Cerino",
"Franco",
""
],
[
"Diaz-Pace",
"Andrés",
""
],
[
"Tassone",
"Emmanuel",
""
],
[
"Tiglio",
"Manuel",
""
],
[
"Villegas",
"Atuel",
""
]
] | In a previous work we introduced, in the context of gravitational wave science, an initial study on an automated domain-decomposition approach for reduced basis through hp-greedy refinement. The approach constructs local reduced bases of lower dimensionality than global ones, with the same or higher accuracy. These ``l... |
1106.4807 | James Friedrichsen III | Takahide Okabe, P. J. Morrison, J. E. Friedrichsen III, L. C. Shepley | Hamiltonian Dynamics of Spatially-Homogeneous Vlasov-Einstein Systems | 23 pages, 2 figures, to be published in Physical Review D (expected
to be published in the July 2011 issue) | Phys.Rev.D84:024011,2011 | 10.1103/PhysRevD.84.024011 | null | gr-qc math-ph math.MP physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new matter action principle, with a wide range of
applicability, for the Vlasov equation in terms of a conjugate pair of
functions. Here we apply this action principle to the study of matter in
Bianchi cosmological models in general relativity. The Bianchi models are
spatially-homogeneous solutions to ... | [
{
"created": "Thu, 23 Jun 2011 19:51:39 GMT",
"version": "v1"
}
] | 2011-08-08 | [
[
"Okabe",
"Takahide",
""
],
[
"Morrison",
"P. J.",
""
],
[
"Friedrichsen",
"J. E.",
"III"
],
[
"Shepley",
"L. C.",
""
]
] | We introduce a new matter action principle, with a wide range of applicability, for the Vlasov equation in terms of a conjugate pair of functions. Here we apply this action principle to the study of matter in Bianchi cosmological models in general relativity. The Bianchi models are spatially-homogeneous solutions to th... |
2402.05358 | Muzi Hong | Minxi He, Muzi Hong, Kyohei Mukaida | Starobinsky Inflation and beyond in Einstein-Cartan Gravity | 24 pages, 2 figures | JCAP 05 (2024) 107 | 10.1088/1475-7516/2024/05/107 | KEK-TH-2598, RESCEU-3/24, CTPU-PTC-24-05 | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by/4.0/ | We show that various types of scalaron-induced inflation, including the
Starobinsky inflation, can be realized in the Einstein-Cartan gravity with the
Nieh-Yan term and/or the Holst term. Einstein-Cartan $f(R)$ theory is known not
to induce an additional scalar degree of freedom, the scalaron, contrary to the
case in... | [
{
"created": "Thu, 8 Feb 2024 02:35:13 GMT",
"version": "v1"
}
] | 2024-06-18 | [
[
"He",
"Minxi",
""
],
[
"Hong",
"Muzi",
""
],
[
"Mukaida",
"Kyohei",
""
]
] | We show that various types of scalaron-induced inflation, including the Starobinsky inflation, can be realized in the Einstein-Cartan gravity with the Nieh-Yan term and/or the Holst term. Einstein-Cartan $f(R)$ theory is known not to induce an additional scalar degree of freedom, the scalaron, contrary to the case in t... |
gr-qc/0010019 | Nicholas G. Phillips | Nicholas G Phillips, B. L. Hu | Noise Kernel in Stochastic Gravity and Stress Energy Bi-Tensor of
Quantum Fields in Curved Spacetimes | 22 Pages, RevTeX; version accepted for publication in PRD | Phys.Rev.D63:104001,2001 | 10.1103/PhysRevD.63.104001 | null | gr-qc | null | The noise kernel is the vacuum expectation value of the (operator-valued)
stress-energy bi-tensor which describes the fluctuations of a quantum field in
curved spacetimes. It plays the role in stochastic semiclassical gravity based
on the Einstein-Langevin equation similar to the expectation value of the
stress-energ... | [
{
"created": "Thu, 5 Oct 2000 14:53:47 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2001 15:14:14 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Phillips",
"Nicholas G",
""
],
[
"Hu",
"B. L.",
""
]
] | The noise kernel is the vacuum expectation value of the (operator-valued) stress-energy bi-tensor which describes the fluctuations of a quantum field in curved spacetimes. It plays the role in stochastic semiclassical gravity based on the Einstein-Langevin equation similar to the expectation value of the stress-energy ... |
1805.02479 | Kodai Ueda | Kodai Ueda and Akihiro Ishibashi | Massive vector field perturbations on extremal and near-extremal static
black holes | 27 pages, No figures; v2: journal version, minor corrections,
reference added | Phys. Rev. D 97, 124050 (2018) | 10.1103/PhysRevD.97.124050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a new perturbation method to study the dynamics of massive vector
fields on (near-)extremal static black hole spacetimes. We start with, as our
background, a rather generic class of warped product metrics, and classify the
field variables into the vector(axial)- and scalar(polar)-type components. On
this g... | [
{
"created": "Mon, 7 May 2018 12:44:50 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Oct 2019 13:23:49 GMT",
"version": "v2"
}
] | 2019-10-29 | [
[
"Ueda",
"Kodai",
""
],
[
"Ishibashi",
"Akihiro",
""
]
] | We discuss a new perturbation method to study the dynamics of massive vector fields on (near-)extremal static black hole spacetimes. We start with, as our background, a rather generic class of warped product metrics, and classify the field variables into the vector(axial)- and scalar(polar)-type components. On this gen... |
0910.3876 | Orfeu Bertolami | Orfeu Bertolami, Miguel Carvalho Sequeira | Modified theories of gravity with non-minimal curvature-matter coupling | 6 pages, 1 table. Talk present by O. B. at the "Invisible Universe
International Conference", Paris, Palais de l'UNESCO June 29- July 3. To
appear in the Proceedings | AIP Conf.Proc.1241:729-734,2010 | 10.1063/1.3462709 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution one examines the generalization of the $f(R)$ theories
of gravity where one introduces a non-minimal coupling between curvature and
matter. This model has new and interesting features. %, specially concerning
the energy exchange between the matter fields and the curvature. However, as
any modifie... | [
{
"created": "Tue, 20 Oct 2009 15:32:05 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Sequeira",
"Miguel Carvalho",
""
]
] | In this contribution one examines the generalization of the $f(R)$ theories of gravity where one introduces a non-minimal coupling between curvature and matter. This model has new and interesting features. %, specially concerning the energy exchange between the matter fields and the curvature. However, as any modified ... |
0805.3729 | Olaf Dreyer | Olaf Dreyer | Early Universe Cosmology in Internal Relativity | 7 pages, 3 figures | null | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new approach to early universe cosmology. Inflation is replaced
by a phase transition in which both matter and geometry are created
simultaneously. We calculate the spectrum of metric perturbations and show that
it is flat. We then argue that as a consequence of the dynamic nature of the
phase transition... | [
{
"created": "Fri, 23 May 2008 23:26:55 GMT",
"version": "v1"
}
] | 2008-05-28 | [
[
"Dreyer",
"Olaf",
""
]
] | We present a new approach to early universe cosmology. Inflation is replaced by a phase transition in which both matter and geometry are created simultaneously. We calculate the spectrum of metric perturbations and show that it is flat. We then argue that as a consequence of the dynamic nature of the phase transition t... |
gr-qc/0702036 | Andrew DeBenedictis | S. Kloster, J. Brannlund, A. DeBenedictis | Phase-space and Black Hole Entropy of Higher Genus Horizons in Loop
Quantum Gravity | 22 pages, 9 figures. References updated. Minor changes to match
version to appear in Class. Quant. Grav | Class.Quant.Grav.25:065008,2008 | 10.1088/0264-9381/25/6/065008 | null | gr-qc hep-th | null | In the context of loop quantum gravity, we construct the phase-space of
isolated horizons with genus greater than 0. Within the loop quantum gravity
framework, these horizons are described by genus g surfaces with N punctures
and the dimension of the corresponding phase-space is calculated including the
genus cycles ... | [
{
"created": "Wed, 7 Feb 2007 00:03:42 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Aug 2007 23:03:15 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Feb 2008 16:24:44 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kloster",
"S.",
""
],
[
"Brannlund",
"J.",
""
],
[
"DeBenedictis",
"A.",
""
]
] | In the context of loop quantum gravity, we construct the phase-space of isolated horizons with genus greater than 0. Within the loop quantum gravity framework, these horizons are described by genus g surfaces with N punctures and the dimension of the corresponding phase-space is calculated including the genus cycles as... |
2201.09715 | Ratchaphat Nakarachinda | Ratchaphat Nakarachinda, Chakrit Pongkitivanichkul, Daris Samart,
Lunchakorn Tannukij and Pitayuth Wongjun | Holographic Dark Energy from the Anti-de Sitter Black Hole | 29 pages, 6 figures, 5 tables (in the version2, we have added Sec. 4:
Observational constraints.) | null | 10.1103/PhysRevD.105.123524 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anti-de Sitter (AdS) black hole plays an important role in the
holographic principle. In this study, the upper bound in energy corresponding
to the mass of the Schwarzschild black hole is modified to be that of the AdS
black hole. Via the correspondence between the ultraviolet (UV) and infrared
(IR) cutoffs, the ... | [
{
"created": "Mon, 24 Jan 2022 14:41:41 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2022 11:03:58 GMT",
"version": "v2"
}
] | 2022-11-18 | [
[
"Nakarachinda",
"Ratchaphat",
""
],
[
"Pongkitivanichkul",
"Chakrit",
""
],
[
"Samart",
"Daris",
""
],
[
"Tannukij",
"Lunchakorn",
""
],
[
"Wongjun",
"Pitayuth",
""
]
] | The anti-de Sitter (AdS) black hole plays an important role in the holographic principle. In this study, the upper bound in energy corresponding to the mass of the Schwarzschild black hole is modified to be that of the AdS black hole. Via the correspondence between the ultraviolet (UV) and infrared (IR) cutoffs, the co... |
gr-qc/0410039 | Matteo Luca Ruggiero | Matteo Luca Ruggiero | Rotation Effects and The Gravito-Magnetic Approach | 3 pages, LaTeX, 1 EPS figure; to appear in the Proceedings for the
``XVI SIGRAV Conference'' in Vietri sul Mare (SA) 13-16 September 2004,
References Changed, Misprints Corrected | AIP Conf.Proc.751:251-254,2005 | 10.1063/1.1891567 | null | gr-qc | null | Gravito-electromagnetism is somewhat ubiquitous in relativity. In fact, there
are many situations where the effects of gravitation can be described by
formally introducing "gravito-electric" and "gravito-magnetic" fields, starting
from the corresponding potentials, in analogy with the electromagnetic theory
(see also... | [
{
"created": "Fri, 8 Oct 2004 14:30:17 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Oct 2004 10:46:47 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Ruggiero",
"Matteo Luca",
""
]
] | Gravito-electromagnetism is somewhat ubiquitous in relativity. In fact, there are many situations where the effects of gravitation can be described by formally introducing "gravito-electric" and "gravito-magnetic" fields, starting from the corresponding potentials, in analogy with the electromagnetic theory (see also A... |
1403.7275 | Stanley P. Gudder | Stan Gudder | Elementary Particles and the Causet Approach to Discrete Quantum Gravity | 9 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper, the author introduced a covariant causet ($c$-causet)
approach to discrete quantum gravity. A $c$-causet is a finite partially
ordered set that is invariant under labeling. The invariant labeling of a
$c$-causet $x$ enables us to uniquely specify $x$ by a sequence
$\brac{s_j(x)}$, $j=0,1,2,\ldots... | [
{
"created": "Fri, 28 Mar 2014 03:45:47 GMT",
"version": "v1"
}
] | 2014-03-31 | [
[
"Gudder",
"Stan",
""
]
] | In a previous paper, the author introduced a covariant causet ($c$-causet) approach to discrete quantum gravity. A $c$-causet is a finite partially ordered set that is invariant under labeling. The invariant labeling of a $c$-causet $x$ enables us to uniquely specify $x$ by a sequence $\brac{s_j(x)}$, $j=0,1,2,\ldots$,... |
2103.15610 | Jan Ambjorn | J. Ambjorn, Z. Drogosz, J. Gizbert-Studnicki, A. G\"orlich, J.
Jurkiewicz and D. N\`emeth | CDT Quantum Toroidal Spacetimes: An Overview | 36 pages, a lot of figures | null | null | null | gr-qc hep-lat hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Lattice formulations of gravity can be used to study non-perturbative aspects
of quantum gravity. Causal Dynamical Triangulations (CDT) is a lattice model of
gravity that has been used in this way. It has a built-in time foliation but is
coordinate-independent in the spatial directions. The higher-order phase
transit... | [
{
"created": "Mon, 29 Mar 2021 13:39:40 GMT",
"version": "v1"
}
] | 2021-03-30 | [
[
"Ambjorn",
"J.",
""
],
[
"Drogosz",
"Z.",
""
],
[
"Gizbert-Studnicki",
"J.",
""
],
[
"Görlich",
"A.",
""
],
[
"Jurkiewicz",
"J.",
""
],
[
"Nèmeth",
"D.",
""
]
] | Lattice formulations of gravity can be used to study non-perturbative aspects of quantum gravity. Causal Dynamical Triangulations (CDT) is a lattice model of gravity that has been used in this way. It has a built-in time foliation but is coordinate-independent in the spatial directions. The higher-order phase transitio... |
0911.1506 | Hsiang-Lin Lou | Hsiang-Lin Lou and Pei-Hsuan Li | Orthonormal Frame and SO(3) Kaluza-Klein Dyon | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous paper, we present an SO(3) Wu-Yang-like Kaluza-Klein dyon so-
lution satisfies the Einstein equation in the seven-dimensional spacetimes. In
this note, we will show an alternative approach using an orthonormal frame, the
Cartan's structure equations, and calculating the affine spin connection
one-form,cur... | [
{
"created": "Sun, 8 Nov 2009 10:21:30 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Lou",
"Hsiang-Lin",
""
],
[
"Li",
"Pei-Hsuan",
""
]
] | In previous paper, we present an SO(3) Wu-Yang-like Kaluza-Klein dyon so- lution satisfies the Einstein equation in the seven-dimensional spacetimes. In this note, we will show an alternative approach using an orthonormal frame, the Cartan's structure equations, and calculating the affine spin connection one-form,curva... |
2404.01418 | Lei You | Lei You and Yu-Hang Feng and Rui-Bo Wang and Jian-Bo Deng and Xian-Ru
Hu | Decoding quantum gravity information with black hole accretion disk | 33 pages, 14 figures, 1 table. arXiv admin note: text overlap with
arXiv:2403.12840 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The combination of Loop Quantum Gravity theory with the classical
gravitational collapse model has effectively addressed the singularity problem
of black holes and predicted the emergence of white holes in the late stages of
collapse. The quantum extension of Kruskal spacetime suggests that the
appearance of white ho... | [
{
"created": "Mon, 1 Apr 2024 18:52:59 GMT",
"version": "v1"
}
] | 2024-04-03 | [
[
"You",
"Lei",
""
],
[
"Feng",
"Yu-Hang",
""
],
[
"Wang",
"Rui-Bo",
""
],
[
"Deng",
"Jian-Bo",
""
],
[
"Hu",
"Xian-Ru",
""
]
] | The combination of Loop Quantum Gravity theory with the classical gravitational collapse model has effectively addressed the singularity problem of black holes and predicted the emergence of white holes in the late stages of collapse. The quantum extension of Kruskal spacetime suggests that the appearance of white hole... |
0908.0138 | M. B. Altaie | M.B. Altaie | A quantum black hole universe | 10 pages | Hadronic J.30:447-456,2008 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the result obtained in a prevoius paper, in which I found an upper
limit on the region of particle creation in the vicinity of the event horizon
of a Schwarzschild black hole, and by assuming that all the created energy will
be absorbed by the black hole, a natural power law for the growth of the event
horizon ... | [
{
"created": "Sun, 2 Aug 2009 17:18:46 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Altaie",
"M. B.",
""
]
] | Using the result obtained in a prevoius paper, in which I found an upper limit on the region of particle creation in the vicinity of the event horizon of a Schwarzschild black hole, and by assuming that all the created energy will be absorbed by the black hole, a natural power law for the growth of the event horizon is... |
gr-qc/0205085 | Haret Rosu | H.C. Rosu, M. Planat | On arithmetic detection of grey pulses with application to Hawking
radiation | 5 pages, published version | Mod.Phys.Lett. A17 (2002) 1377-1382 | 10.1142/S0217732302007430 | null | gr-qc | null | Micron-sized black holes do not necessarily have a constant horizon
temperature distribution. The black hole remote-sensing problem means to find
out the `surface' temperature distribution of a small black hole from the
spectral measurement of its (Hawking) grey pulse. This problem has been
previously considered by R... | [
{
"created": "Sun, 19 May 2002 20:39:51 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Aug 2002 00:33:22 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Rosu",
"H. C.",
""
],
[
"Planat",
"M.",
""
]
] | Micron-sized black holes do not necessarily have a constant horizon temperature distribution. The black hole remote-sensing problem means to find out the `surface' temperature distribution of a small black hole from the spectral measurement of its (Hawking) grey pulse. This problem has been previously considered by Ros... |
1709.08665 | Bogeun Gwak | Bogeun Gwak | Thermodynamics with Pressure and Volume under Charged Particle
Absorption | 14 pages, 5 figures | JHEP 1711 (2017) 129 | 10.1007/JHEP11(2017)129 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the variation of the charged anti-de Sitter black hole under
charged particle absorption by considering thermodynamic volume. The variation
exactly corresponds to that expected as the first law of thermodynamics.
Nevertheless, we find the decrease of the Bekenstein-Hawking entropy for
extremal and near... | [
{
"created": "Mon, 25 Sep 2017 18:40:55 GMT",
"version": "v1"
}
] | 2017-11-27 | [
[
"Gwak",
"Bogeun",
""
]
] | We investigate the variation of the charged anti-de Sitter black hole under charged particle absorption by considering thermodynamic volume. The variation exactly corresponds to that expected as the first law of thermodynamics. Nevertheless, we find the decrease of the Bekenstein-Hawking entropy for extremal and near-e... |
2305.17735 | Indranil Chakraborty | Subhajit Barman, Indranil Chakraborty, Sajal Mukherjee | Entanglement harvesting for different gravitational wave burst profiles
with and without memory | Some additions and clarifications, matches with the published version
in JHEP | null | 10.1007/JHEP09(2023)180 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present article, we study how different gravitational wave (GW) burst
profiles in linearized gravity, with and without the asymptotic memory, may
influence the harvesting between two static Unruh-DeWitt detectors. To this
end, we investigate the following burst profiles -- Gaussian, sech-squared,
Heaviside ste... | [
{
"created": "Sun, 28 May 2023 14:29:22 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2023 16:07:44 GMT",
"version": "v2"
}
] | 2023-09-29 | [
[
"Barman",
"Subhajit",
""
],
[
"Chakraborty",
"Indranil",
""
],
[
"Mukherjee",
"Sajal",
""
]
] | In the present article, we study how different gravitational wave (GW) burst profiles in linearized gravity, with and without the asymptotic memory, may influence the harvesting between two static Unruh-DeWitt detectors. To this end, we investigate the following burst profiles -- Gaussian, sech-squared, Heaviside step ... |
gr-qc/9310024 | null | John F. Donoghue | Leading Quantum Correction to the Newtonian Potential | UMHEP-396, Latex file, 9 pages (In the revised version, I correct a
mistake in the computation, change to the + - - - metric, and add a few
comments.) | Phys.Rev.Lett. 72 (1994) 2996-2999 | 10.1103/PhysRevLett.72.2996 | null | gr-qc hep-ph | null | I argue that the leading quantum corrections, in powers of the energy or
inverse powers of the distance, may be computed in quantum gravity through
knowledge of only the low energy structure of the theory. As an example, I
calculate the leading quantum corrections to the Newtonian gravitational
potential.
| [
{
"created": "Mon, 18 Oct 1993 19:20:28 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 1994 19:56:58 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Donoghue",
"John F.",
""
]
] | I argue that the leading quantum corrections, in powers of the energy or inverse powers of the distance, may be computed in quantum gravity through knowledge of only the low energy structure of the theory. As an example, I calculate the leading quantum corrections to the Newtonian gravitational potential. |
1211.5939 | Yongge Ma | Zhenhua Zhou, Haibiao Guo, Yu Han and Yongge Ma | Action principle for the connection dynamics of scalar-tensor theories | 5 pages; subtantial change: new action proposed, new reference added;
to appear in PRD | Phys. Rev. D 87, 087502 (2013) | 10.1103/Phys.Rev.D.87.087502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A first-order action for scalar-tensor theories of gravity is proposed. The
Hamiltonian analysis of the action gives the desired connection dynamical
formalism, which was derived from the geometrical dynamics by canonical
transformations. It is shown that this connection formalism in Jordan frame is
equivalent to the... | [
{
"created": "Mon, 26 Nov 2012 13:04:36 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2013 10:05:37 GMT",
"version": "v2"
}
] | 2013-05-07 | [
[
"Zhou",
"Zhenhua",
""
],
[
"Guo",
"Haibiao",
""
],
[
"Han",
"Yu",
""
],
[
"Ma",
"Yongge",
""
]
] | A first-order action for scalar-tensor theories of gravity is proposed. The Hamiltonian analysis of the action gives the desired connection dynamical formalism, which was derived from the geometrical dynamics by canonical transformations. It is shown that this connection formalism in Jordan frame is equivalent to the a... |
gr-qc/0109046 | Chopin Soo | Chopin Soo | Wave function of the Universe and Chern-Simons Perturbation Theory | 10 pages, RevTeX | Class.Quant.Grav. 19 (2002) 1051-1064 | 10.1088/0264-9381/19/6/303 | null | gr-qc astro-ph hep-th math-ph math.MP | null | The Chern-Simons exact solution of four-dimensional quantum gravity with
nonvanishing cosmological constant is presented in metric variable as the
partition function of a Chern-Simons theory with nontrivial source. The
perturbative expansion is given, and the wave function is computed to the
lowest order of approxima... | [
{
"created": "Thu, 13 Sep 2001 13:14:30 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2001 13:41:55 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Feb 2002 12:43:02 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Soo",
"Chopin",
""
]
] | The Chern-Simons exact solution of four-dimensional quantum gravity with nonvanishing cosmological constant is presented in metric variable as the partition function of a Chern-Simons theory with nontrivial source. The perturbative expansion is given, and the wave function is computed to the lowest order of approximati... |
0812.4098 | Yun Soo Myung | Kyoung Yee Kim, Hyung Won Lee, and Yun Soo Myung | On the Ricci dark energy model | 8 pages | Gen.Rel.Grav.43:1095-1101,2011 | 10.1007/s10714-010-0941-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Ricci dark energy model (RDE) which was introduced as an
alternative to the holographic dark energy model. We point out that an
accelerating phase of the RDE is that of a constant dark energy model. This
implies that the RDE may not be a new model of explaining the present
accelerating universe.
| [
{
"created": "Mon, 22 Dec 2008 05:31:45 GMT",
"version": "v1"
}
] | 2011-03-28 | [
[
"Kim",
"Kyoung Yee",
""
],
[
"Lee",
"Hyung Won",
""
],
[
"Myung",
"Yun Soo",
""
]
] | We study the Ricci dark energy model (RDE) which was introduced as an alternative to the holographic dark energy model. We point out that an accelerating phase of the RDE is that of a constant dark energy model. This implies that the RDE may not be a new model of explaining the present accelerating universe. |
1804.01519 | Jiri Podolsky | Jiri Podolsky, Ondrej Hruska, Jerry B. Griffiths | Non-expanding Plebanski-Demianski space-times | 35 pages, 11 figures | Class. Quantum Grav. 35 (2018) 165011 | 10.1088/1361-6382/aacdd5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this work is to describe the complete family of non-expanding
Plebanski-Demianski type D space-times and to present their possible
interpretation. We explicitly express the most general form of such
(electro)vacuum solutions with any cosmological constant, and we investigate
the geometrical and physical me... | [
{
"created": "Wed, 4 Apr 2018 17:45:02 GMT",
"version": "v1"
}
] | 2021-08-06 | [
[
"Podolsky",
"Jiri",
""
],
[
"Hruska",
"Ondrej",
""
],
[
"Griffiths",
"Jerry B.",
""
]
] | The aim of this work is to describe the complete family of non-expanding Plebanski-Demianski type D space-times and to present their possible interpretation. We explicitly express the most general form of such (electro)vacuum solutions with any cosmological constant, and we investigate the geometrical and physical mean... |
1210.5619 | Vasudev Shyam S | Vasudev Shyam and B. S. Ramachandra | Presymplectic Geometry And The Problem Of Time. Part 2 | 16 pages, 2 figures, continuation of arXiv:1209.5547v2, new material
added in v2 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Problem of Time in Quantum Gravity is analyzed from a classical
presymplectic perspective. In the first part of the paper the Three Space
Approach to General Relativity is introduced via the Barbour-Foster-\'O
Murchadha action and the dynamics corresponding to a theory of relativistic
gravity where spacetime is n... | [
{
"created": "Sat, 20 Oct 2012 13:42:59 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Oct 2012 01:02:35 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Nov 2012 13:50:02 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Nov 2012 14:22:31 GMT",
"version": "v4"
},
{
"cr... | 2013-01-01 | [
[
"Shyam",
"Vasudev",
""
],
[
"Ramachandra",
"B. S.",
""
]
] | The Problem of Time in Quantum Gravity is analyzed from a classical presymplectic perspective. In the first part of the paper the Three Space Approach to General Relativity is introduced via the Barbour-Foster-\'O Murchadha action and the dynamics corresponding to a theory of relativistic gravity where spacetime is not... |
2012.14206 | Jun Tao | Hongmei Jing, Benrong Mu, Jun Tao, Peng Wang | Thermodynamic Instability of $\mathrm{{3D}}$ Einstein-Born-Infeld AdS
Black Holes | 8 figures | null | 10.1088/1674-1137/abf1dc | CTP-SCU/2020042 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Super-entropic black holes possess finite-area but noncompact event horizons
and violate the reverse isoperimetric inequality. It has been conjectured that
such black holes always have negative specific heat at constant volume $C_{V}$
or negative specific heat at constant pressure $C_{P}$ whenever $C_{V}>0$,
making t... | [
{
"created": "Mon, 28 Dec 2020 11:57:59 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Dec 2020 12:43:38 GMT",
"version": "v2"
},
{
"created": "Thu, 6 May 2021 02:03:38 GMT",
"version": "v3"
}
] | 2021-05-07 | [
[
"Jing",
"Hongmei",
""
],
[
"Mu",
"Benrong",
""
],
[
"Tao",
"Jun",
""
],
[
"Wang",
"Peng",
""
]
] | Super-entropic black holes possess finite-area but noncompact event horizons and violate the reverse isoperimetric inequality. It has been conjectured that such black holes always have negative specific heat at constant volume $C_{V}$ or negative specific heat at constant pressure $C_{P}$ whenever $C_{V}>0$, making the... |
2110.09363 | Alexandre Camargo | A. de Camargo, R. F. Sobreiro, V. J. Vasquez Otoya | Master equations governing the coupling between spin-currents and
gravity | 7 pages, no figures | null | 10.1140/epjc/s10052-022-10856-2 | null | gr-qc cond-mat.other hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work we consider the Einstein-Hilbert action in the first order order
formalism coupled to Dirac spinors. From the little group symmetry, we derive
the corresponding Bargmann-Wigner current which is conserved but not gauge
invariant. Therefore, we construct a gauge invariant version of the
Bargmann-Wigner cur... | [
{
"created": "Mon, 18 Oct 2021 14:48:43 GMT",
"version": "v1"
}
] | 2022-10-26 | [
[
"de Camargo",
"A.",
""
],
[
"Sobreiro",
"R. F.",
""
],
[
"Otoya",
"V. J. Vasquez",
""
]
] | In this work we consider the Einstein-Hilbert action in the first order order formalism coupled to Dirac spinors. From the little group symmetry, we derive the corresponding Bargmann-Wigner current which is conserved but not gauge invariant. Therefore, we construct a gauge invariant version of the Bargmann-Wigner curre... |
1704.05153 | Jose Socorro Garcia | Omar E. N\'u\~nez, J. Socorro and Jos\'e Venegas | Cosmological super inflation using Hamilton's approach | 9 pages, 2 figures, latex2e | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Friedmann-Robertson-Walker (FRW) cosmology is analyzed with a particular
potential $\rm V(\phi)=V_0 e^{-\sqrt{3} \phi}$ in the quintessence field
scenario, which emerges in the supersymmetric quantum mechanics (SUSY)
formalism. Using Hamilton's approach for a scalar field $\phi$ with standard
kinetic energy, and ... | [
{
"created": "Mon, 17 Apr 2017 23:53:54 GMT",
"version": "v1"
}
] | 2017-04-19 | [
[
"Núñez",
"Omar E.",
""
],
[
"Socorro",
"J.",
""
],
[
"Venegas",
"José",
""
]
] | The Friedmann-Robertson-Walker (FRW) cosmology is analyzed with a particular potential $\rm V(\phi)=V_0 e^{-\sqrt{3} \phi}$ in the quintessence field scenario, which emerges in the supersymmetric quantum mechanics (SUSY) formalism. Using Hamilton's approach for a scalar field $\phi$ with standard kinetic energy, and th... |
1908.00193 | Edward Anderson | Edward Anderson | Nijenhuis-type variants of Local Theory of Background Independence | 4 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A local resolution of the Problem of Time has recently been given, alongside
reformulation as a local theory of Background Independence. The classical part
of this can be viewed as requiring just Lie's Mathematics, albeit entrenched in
subsequent Topology and Differential Geometry developments and extended to the
set... | [
{
"created": "Thu, 1 Aug 2019 03:18:42 GMT",
"version": "v1"
}
] | 2019-08-02 | [
[
"Anderson",
"Edward",
""
]
] | A local resolution of the Problem of Time has recently been given, alongside reformulation as a local theory of Background Independence. The classical part of this can be viewed as requiring just Lie's Mathematics, albeit entrenched in subsequent Topology and Differential Geometry developments and extended to the setti... |
1710.04473 | Etera R. Livine | Alexandre Feller, Etera R. Livine | Entanglement entropy and correlations in loop quantum gravity | 8 pages (+ 4 pages of supplemental material) | null | 10.1088/1361-6382/aaa27c | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole entropy is one of the few windows toward the quantum aspects of
gravitation and its study over the years have highlighted the holographic
nature of gravity. At the non-perturbative level in quantum gravity, promising
explanations are being explored in terms of the entanglement entropy between
regions of sp... | [
{
"created": "Thu, 12 Oct 2017 12:31:39 GMT",
"version": "v1"
}
] | 2018-02-14 | [
[
"Feller",
"Alexandre",
""
],
[
"Livine",
"Etera R.",
""
]
] | Black hole entropy is one of the few windows toward the quantum aspects of gravitation and its study over the years have highlighted the holographic nature of gravity. At the non-perturbative level in quantum gravity, promising explanations are being explored in terms of the entanglement entropy between regions of spac... |
2204.00090 | Omar Valdivia O. Valdivia | E. Elizalde, F. Izaurieta, C. Riveros, G. Salgado, O. Valdivia | Gravitational Waves in Einstein-Cartan Theory: On the Effects of Dark
Matter Spin Tensor | 29 pages, 2 figures, accepted for publication in Physics of the Dark
Universe | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | This article studies the effects of an arbitrary dark matter spin tensor on
the propagation of gravitational wave amplitude in the context of
Einstein-Cartan theory. We choose to work with an arbitrary spin tensor
because, given our ignorance of the nature of dark matter, it is sensible not
to make further hypotheses... | [
{
"created": "Thu, 31 Mar 2022 21:05:17 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2023 14:36:09 GMT",
"version": "v2"
}
] | 2023-02-21 | [
[
"Elizalde",
"E.",
""
],
[
"Izaurieta",
"F.",
""
],
[
"Riveros",
"C.",
""
],
[
"Salgado",
"G.",
""
],
[
"Valdivia",
"O.",
""
]
] | This article studies the effects of an arbitrary dark matter spin tensor on the propagation of gravitational wave amplitude in the context of Einstein-Cartan theory. We choose to work with an arbitrary spin tensor because, given our ignorance of the nature of dark matter, it is sensible not to make further hypotheses o... |
0902.4654 | Piero Nicolini | Piero Nicolini and Euro Spallucci | Noncommutative geometry inspired dirty black holes | 12 pages, 4 figures, title changed, reference list enlarged, reduced
version accepted for publication on Classical and Quantum Gravity | Class.Quant.Grav.27:015010,2010 | 10.1088/0264-9381/27/1/015010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a new exact solution of the Einstein equations which generalizes
the noncommutative geometry inspired Schwarzschild metric, we previously
obtained. We consider here more general relations between the energy density
and the radial pressure and find new a geometry describing a regular ``dirty
black hole''. W... | [
{
"created": "Thu, 26 Feb 2009 18:10:20 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2009 18:37:05 GMT",
"version": "v2"
}
] | 2010-01-06 | [
[
"Nicolini",
"Piero",
""
],
[
"Spallucci",
"Euro",
""
]
] | We provide a new exact solution of the Einstein equations which generalizes the noncommutative geometry inspired Schwarzschild metric, we previously obtained. We consider here more general relations between the energy density and the radial pressure and find new a geometry describing a regular ``dirty black hole''. We ... |
1508.04576 | Massimiliano Rinaldi | Massimiliano Rinaldi | Dark energy as a fixed point of the Einstein Yang-Mills Higgs Equations | No changes, accepted for publication on JCAP | JCAP10(2015)023 | 10.1088/1475-7516/2015/10/023 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Einstein Yang-Mills Higgs equations in the $SO(3)$
representation on a isotropic and homogeneous flat Universe, in the presence of
radiation and matter fluids. We map the equations of motion into an autonomous
dynamical system of first-order differential equations and we find the
equilibrium points. We s... | [
{
"created": "Wed, 19 Aug 2015 09:18:20 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2015 15:25:37 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Sep 2015 08:31:28 GMT",
"version": "v3"
}
] | 2015-10-13 | [
[
"Rinaldi",
"Massimiliano",
""
]
] | We study the Einstein Yang-Mills Higgs equations in the $SO(3)$ representation on a isotropic and homogeneous flat Universe, in the presence of radiation and matter fluids. We map the equations of motion into an autonomous dynamical system of first-order differential equations and we find the equilibrium points. We sho... |
2202.06122 | Francesco Bajardi | Habib Abedi, Francesco Bajardi, Salvatore Capozziello | Linearized Field Equations and Extra Force in $f(R,{\bf T}^{(n)})$
Extended Gravity | 11 pages | null | 10.1142/S0218271822400156 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an extended theory of gravity with Lagrangian $\mathcal{L} =
f(R,{\bf T}^{(n)})$, with ${\bf T}^{(n)}$ being a $2n$-th order invariant made
of contractions of the energy-momentum tensor. When $n=1$ this theory reduces
to $f(R,T)$ gravity, where $T$ accounts for the trace of the energy-momentum
tensor. We ... | [
{
"created": "Sat, 12 Feb 2022 18:34:49 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Abedi",
"Habib",
""
],
[
"Bajardi",
"Francesco",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We consider an extended theory of gravity with Lagrangian $\mathcal{L} = f(R,{\bf T}^{(n)})$, with ${\bf T}^{(n)}$ being a $2n$-th order invariant made of contractions of the energy-momentum tensor. When $n=1$ this theory reduces to $f(R,T)$ gravity, where $T$ accounts for the trace of the energy-momentum tensor. We st... |
2310.06490 | Songbai Chen | Songbai Chen, Jiliang Jing | Kerr black hole shadows from the axion-photon coupling | 16 pages, 2 figures. Accepted by JCAP for publication. arXiv admin
note: text overlap with arXiv:2308.16479 | JCAP 05 (2024) 023 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the motion for photons in the Kerr black hole spacetime
under the axion-photon coupling. The birefringence phenomena arising from the
axion-photon coupling can be negligible in the weak coupling approximation
because the leading-order contributions to the equations of motion come from
the square ... | [
{
"created": "Tue, 10 Oct 2023 09:58:39 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 2024 07:25:50 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Apr 2024 02:27:40 GMT",
"version": "v3"
},
{
"created": "Mon, 6 May 2024 03:47:30 GMT",
"version": "v4"
}
] | 2024-05-07 | [
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have investigated the motion for photons in the Kerr black hole spacetime under the axion-photon coupling. The birefringence phenomena arising from the axion-photon coupling can be negligible in the weak coupling approximation because the leading-order contributions to the equations of motion come from the square te... |
2208.09988 | Wei-Liang Qian | Cai-Ying Shao, Yu-Jie Tan, Cheng-Gang Shao, Kai Lin, Wei-Liang Qian | Qusinormal oscillations and late-time tail of massless scalar
perturbations of a magnetized black hole in Rastall gravity | Accepted for publication on CPC, doi: 10.1088/1674-1137/ac7855 | null | 10.1088/1674-1137/ac7855 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the quasinormal mode and late-time tail of charged
massless scalar perturbations of a black hole in the generalized Rastall
gravity. The black hole metric in question is spherically symmetric,
accompanied by a power-Maxwell field surrounded by a quintessence fluid. It is
shown that the massles... | [
{
"created": "Sun, 21 Aug 2022 23:54:20 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Shao",
"Cai-Ying",
""
],
[
"Tan",
"Yu-Jie",
""
],
[
"Shao",
"Cheng-Gang",
""
],
[
"Lin",
"Kai",
""
],
[
"Qian",
"Wei-Liang",
""
]
] | In this paper, we study the quasinormal mode and late-time tail of charged massless scalar perturbations of a black hole in the generalized Rastall gravity. The black hole metric in question is spherically symmetric, accompanied by a power-Maxwell field surrounded by a quintessence fluid. It is shown that the massless ... |
1010.2421 | Juan A. Valiente-Kroon | T. B\"ackdahl and J. A. Valiente Kroon | The "non-Kerrness" of domains of outer communication of black holes and
exteriors of stars | 13 pages | Proc.Roy.Soc.Lond.A467:1701-1718,2011 | 10.1098/rspa.2010.0535 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we construct a geometric invariant for initial data sets for
the vacuum Einstein field equations $(\mathcal{S},h_{ab},K_{ab})$, such that
$\mathcal{S}$ is a 3-dimensional manifold with an asymptotically Euclidean end
and an inner boundary $\partial \mathcal{S}$ with the topology of the 2-sphere.
The h... | [
{
"created": "Tue, 12 Oct 2010 15:32:13 GMT",
"version": "v1"
}
] | 2011-05-13 | [
[
"Bäckdahl",
"T.",
""
],
[
"Kroon",
"J. A. Valiente",
""
]
] | In this article we construct a geometric invariant for initial data sets for the vacuum Einstein field equations $(\mathcal{S},h_{ab},K_{ab})$, such that $\mathcal{S}$ is a 3-dimensional manifold with an asymptotically Euclidean end and an inner boundary $\partial \mathcal{S}$ with the topology of the 2-sphere. The hyp... |
gr-qc/9912113 | Kashif Alvi | Kashif Alvi (Caltech) | An approximate binary-black-hole metric | 20 pages, 1 figure; some changes in Sec. IV B,C and Sec. V | Phys.Rev. D61 (2000) 124013 | 10.1103/PhysRevD.61.124013 | null | gr-qc | null | An approximate solution to Einstein's equations representing two
widely-separated non-rotating black holes in a circular orbit is constructed by
matching a post-Newtonian metric to two perturbed Schwarzschild metrics. The
spacetime metric is presented in a single coordinate system valid up to the
apparent horizons of... | [
{
"created": "Wed, 29 Dec 1999 04:46:26 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2000 07:28:49 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Alvi",
"Kashif",
"",
"Caltech"
]
] | An approximate solution to Einstein's equations representing two widely-separated non-rotating black holes in a circular orbit is constructed by matching a post-Newtonian metric to two perturbed Schwarzschild metrics. The spacetime metric is presented in a single coordinate system valid up to the apparent horizons of t... |
0707.2794 | Luis Herrera | A. Di Prisco, L. Herrera, G. Le Denmat, M.A.H. MacCallum, N.O. Santos | Nonadiabatic charged spherical gravitational collapse | 23 pages, Latex. To appear in Phys. Rev. D. Some references corrected | Phys.Rev.D76:064017,2007 | 10.1103/PhysRevD.76.064017 | null | gr-qc astro-ph | null | We present a complete set of the equations and matching conditions required
for the description of physically meaningful charged, dissipative, spherically
symmetric gravitational collapse with shear. Dissipation is described with both
free-streaming and diffusion approximations. The effects of viscosity are also
take... | [
{
"created": "Wed, 18 Jul 2007 20:17:02 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2007 19:37:00 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Di Prisco",
"A.",
""
],
[
"Herrera",
"L.",
""
],
[
"Denmat",
"G. Le",
""
],
[
"MacCallum",
"M. A. H.",
""
],
[
"Santos",
"N. O.",
""
]
] | We present a complete set of the equations and matching conditions required for the description of physically meaningful charged, dissipative, spherically symmetric gravitational collapse with shear. Dissipation is described with both free-streaming and diffusion approximations. The effects of viscosity are also taken ... |
1601.00348 | David Sloan | David Sloan | Anisotropic Matter in Cosmology: Locally Rotationally Symmetric Bianchi
$I$ and $VII_o$ Models | 19 pages, 2 figures Updated to correct errors. To appear in CQG | Class. Quant. Grav. 33 (2016) 105011 | 10.1088/0264-9381/33/10/105011 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the behaviour of homogeneous, anisotropic space-times,
specifically the locally rotationally symmetric Bianchi types $I$ and $VII_o$
in the presence of anisotropic matter. By finding an appropriate constant of
the motion, and transforming the equations of motion we are able to provide
exact solutions in th... | [
{
"created": "Sun, 3 Jan 2016 22:34:55 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2016 18:24:00 GMT",
"version": "v2"
}
] | 2016-04-29 | [
[
"Sloan",
"David",
""
]
] | We examine the behaviour of homogeneous, anisotropic space-times, specifically the locally rotationally symmetric Bianchi types $I$ and $VII_o$ in the presence of anisotropic matter. By finding an appropriate constant of the motion, and transforming the equations of motion we are able to provide exact solutions in the ... |
gr-qc/0008043 | Lior M. Burko | Lior M. Burko | Singularity in 2+1 dimensional AdS-scalar black hole | 4 pages, RevTeX, submitted to PRD (brief report) | Phys.Rev.D62:127503,2000 | 10.1103/PhysRevD.62.127503 | null | gr-qc hep-th | null | We study the spacetime singularity in 2+1 dimensional AdS-scalar black hole
with circular symmetry using a quasi-homogeneous model. We show that this is a
spacelike, scalar curvature, deformationally strong singularity.
| [
{
"created": "Thu, 17 Aug 2000 22:58:42 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2000 01:20:44 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Burko",
"Lior M.",
""
]
] | We study the spacetime singularity in 2+1 dimensional AdS-scalar black hole with circular symmetry using a quasi-homogeneous model. We show that this is a spacelike, scalar curvature, deformationally strong singularity. |
1408.3095 | Lorenzo Sindoni | Lorenzo Sindoni | Effective equations for GFT condensates from fidelity | 12 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The derivation of effective equations for group field theories is discussed
from a variational point of view, with the action being determined by the
fidelity of the trial state with respect to the exact state. It is shown how
the maximisation procedure with respect to the parameters of the trial state
lead to the ex... | [
{
"created": "Wed, 13 Aug 2014 19:19:42 GMT",
"version": "v1"
}
] | 2014-08-14 | [
[
"Sindoni",
"Lorenzo",
""
]
] | The derivation of effective equations for group field theories is discussed from a variational point of view, with the action being determined by the fidelity of the trial state with respect to the exact state. It is shown how the maximisation procedure with respect to the parameters of the trial state lead to the expe... |
2107.08611 | P. A. Gonzalez | P. A. Gonz\'alez, \'Angel Rinc\'on, Joel Saavedra, Yerko V\'asquez | Superradiant instability and charged scalar quasinormal modes for
$2+1$-dimensional Coulomb-like AdS black holes from nonlinear electrodynamics | 13 pages and 2 figures. arXiv admin note: substantial text overlap
with arXiv:2104.08603 | null | 10.1103/PhysRevD.104.084047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the propagation of charged scalar fields in the background of
$2+1$-dimensional Coulomb-like AdS black holes, and we show that such
propagation is unstable under Dirichlet boundary conditions. However, all the
unstable modes are superradiant and all the stable modes are non-superradiant,
according with the s... | [
{
"created": "Mon, 19 Jul 2021 04:18:59 GMT",
"version": "v1"
}
] | 2021-10-27 | [
[
"González",
"P. A.",
""
],
[
"Rincón",
"Ángel",
""
],
[
"Saavedra",
"Joel",
""
],
[
"Vásquez",
"Yerko",
""
]
] | We study the propagation of charged scalar fields in the background of $2+1$-dimensional Coulomb-like AdS black holes, and we show that such propagation is unstable under Dirichlet boundary conditions. However, all the unstable modes are superradiant and all the stable modes are non-superradiant, according with the sup... |
1811.04950 | Vitor Cardoso | Taishi Ikeda, Richard Brito, Vitor Cardoso | Electromagnetic emission from axionic clouds and the quenching of
superradiant instabilities | 6 pages, RevTex4. v2: Overall improvement. Accepted for publication
in Physical Review Letters | Phys.Rev.Lett. 122 (2019) no.8, 081101 | 10.1103/PhysRevLett.122.081101 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nature of dark matter is one of the longest-standing puzzles in science.
Axions or axion-like particles are a key possibility, and arise in mechanisms
to solve the strong CP problem but also in low-energy limits of string theory.
Extensive experimental and observational efforts are actively looking for
`axionic' ... | [
{
"created": "Mon, 12 Nov 2018 19:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2019 06:20:09 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Mar 2019 06:48:37 GMT",
"version": "v3"
}
] | 2019-03-06 | [
[
"Ikeda",
"Taishi",
""
],
[
"Brito",
"Richard",
""
],
[
"Cardoso",
"Vitor",
""
]
] | The nature of dark matter is one of the longest-standing puzzles in science. Axions or axion-like particles are a key possibility, and arise in mechanisms to solve the strong CP problem but also in low-energy limits of string theory. Extensive experimental and observational efforts are actively looking for `axionic' im... |
gr-qc/9801047 | Arkady A. Popov | Arkadii Popov (Kazan State Pedagogical University) | Cosmic String Created from Vacuum Fluctuaions | 6 pages, LaTex | null | null | null | gr-qc | null | The possibility of the cosmic string creation by the vacuum fluctuations of
quantum fields in the self-consistent semiclassical theory of gravity is
discussed. We use the approximate method for obtaining vacuum expectation value
of the renormalized stress-energy tensor of conformally invariant quantum
fields in stati... | [
{
"created": "Wed, 14 Jan 1998 10:28:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Popov",
"Arkadii",
"",
"Kazan State Pedagogical University"
]
] | The possibility of the cosmic string creation by the vacuum fluctuations of quantum fields in the self-consistent semiclassical theory of gravity is discussed. We use the approximate method for obtaining vacuum expectation value of the renormalized stress-energy tensor of conformally invariant quantum fields in static ... |
1512.08054 | Tiberiu Harko | J. A. Belinch\'on, T. Harko, M. K. Mak | Exact Scalar-Tensor Cosmological Solutions via Noether Symmetry | 15 pages, 12 figures, accepted for publication in Astrophys. Space
Science | Astrophys Space Sci (2016) 361:52 | 10.1007/s10509-015-2642-7 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the Noether symmetries of a generalized
scalar-tensor, Brans-Dicke type cosmological model, in which we consider
explicit scalar field dependent couplings to the Ricci scalar, and to the
scalar field kinetic energy, respectively. We also include the scalar field
self-interaction potentia... | [
{
"created": "Fri, 25 Dec 2015 23:34:41 GMT",
"version": "v1"
}
] | 2016-02-03 | [
[
"Belinchón",
"J. A.",
""
],
[
"Harko",
"T.",
""
],
[
"Mak",
"M. K.",
""
]
] | In this paper, we investigate the Noether symmetries of a generalized scalar-tensor, Brans-Dicke type cosmological model, in which we consider explicit scalar field dependent couplings to the Ricci scalar, and to the scalar field kinetic energy, respectively. We also include the scalar field self-interaction potential ... |
1007.2792 | John F. Donoghue | Thibault Damour and John F. Donoghue | Equivalence Principle Violations and Couplings of a Light Dilaton | 48 pages, 1 figure | Phys.Rev.D82:084033,2010 | 10.1103/PhysRevD.82.084033 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider possible violations of the equivalence principle through the
exchange of a light `dilaton-like' scalar field. Using recent work on the
quark-mass dependence of nuclear binding, we find that the dilaton-quark-mass
coupling induces significant equivalence-principle-violating effects varying
like the inverse... | [
{
"created": "Fri, 16 Jul 2010 15:11:40 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2010 00:05:31 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Damour",
"Thibault",
""
],
[
"Donoghue",
"John F.",
""
]
] | We consider possible violations of the equivalence principle through the exchange of a light `dilaton-like' scalar field. Using recent work on the quark-mass dependence of nuclear binding, we find that the dilaton-quark-mass coupling induces significant equivalence-principle-violating effects varying like the inverse c... |
1807.08180 | Charles Torre | David Maughan and Charles Torre | Affine Symmetry, Geodesics, and Homogeneous Spacetimes | To appear in General Relativity and Gravitation. Version 2 corrects
some typographical errors | null | 10.1007/s10714-018-2422-0 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the conservation laws for the geodesic equation which are
associated to affine symmetries can be obtained from symmetries of the
Lagrangian for affinely parametrized geodesics according to Noether's theorem,
in contrast to claims found in the literature. In particular, using Aminova's
classification of a... | [
{
"created": "Sat, 21 Jul 2018 17:14:16 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2018 17:59:01 GMT",
"version": "v2"
}
] | 2018-07-27 | [
[
"Maughan",
"David",
""
],
[
"Torre",
"Charles",
""
]
] | We show that the conservation laws for the geodesic equation which are associated to affine symmetries can be obtained from symmetries of the Lagrangian for affinely parametrized geodesics according to Noether's theorem, in contrast to claims found in the literature. In particular, using Aminova's classification of aff... |
gr-qc/0306033 | Eduard Alexis Larranaga Rubio | Alexis Larranaga | Aproximacion Discreta de la Relatividad General | 45 pages, 4 figures. Lecture notes on Regge calculus in Spanish | null | null | null | gr-qc | null | These Lecture notes give an introduction to Regge calculus as a discrete
model of General Relativity.
| [
{
"created": "Mon, 9 Jun 2003 14:14:13 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2007 13:37:20 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Larranaga",
"Alexis",
""
]
] | These Lecture notes give an introduction to Regge calculus as a discrete model of General Relativity. |
2102.00799 | Shao-Wen Wei | Shao-Wen Wei, Yong-Qiang Wang, Yu-Xiao Liu, Robert B. Mann | Observing dynamic oscillatory behavior of triple points among black hole
thermodynamic phase transitions | 6 pages and 6 figures | Sci.China Phys.Mech.Astron. 64, 270411 (2021) | 10.1007/s11433-021-1706-2 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Understanding the dynamic process of black hole thermodynamic phase
transitions at a triple point is a huge challenge. In this letter, we carry out
the first investigation of dynamical phase behaviour at a black hole triple
point. By numerically solving the Smoluchowski equation near the triple point
for a six-dimens... | [
{
"created": "Mon, 1 Feb 2021 12:34:06 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2022 08:33:50 GMT",
"version": "v2"
}
] | 2022-05-05 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Wang",
"Yong-Qiang",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Mann",
"Robert B.",
""
]
] | Understanding the dynamic process of black hole thermodynamic phase transitions at a triple point is a huge challenge. In this letter, we carry out the first investigation of dynamical phase behaviour at a black hole triple point. By numerically solving the Smoluchowski equation near the triple point for a six-dimensio... |
2406.07734 | Jiayue Yang | Mengqi Lu, Jiayue Yang, Robert B. Mann | Gravitational Wormholes | 26 pages, 3 figures, invited paper for special issue on "The Physics
of Time Travel" | Universe 2024, 10(6), 257 | 10.3390/universe10060257 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spacetime wormholes are evidently an essential component of the construction
of a time machine. Within the context of general relativity, such objects
require, for their formation, exotic matter -- matter that violates at least
one of the standard energy conditions. Here, we explore the possibility that
higher-curvat... | [
{
"created": "Tue, 11 Jun 2024 21:40:55 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Lu",
"Mengqi",
""
],
[
"Yang",
"Jiayue",
""
],
[
"Mann",
"Robert B.",
""
]
] | Spacetime wormholes are evidently an essential component of the construction of a time machine. Within the context of general relativity, such objects require, for their formation, exotic matter -- matter that violates at least one of the standard energy conditions. Here, we explore the possibility that higher-curvatur... |
2301.08860 | Manuel D. Malaver | Manuel Malaver, Rajan Iyer and Israr Khan | Study of Compact Stars with Buchdahl Potential in 5-D
Einstein-Gauss-Bonnet Gravity | 22 pages, 14 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we have presented a compact object model in the framework of
Einstein-Gauss-Bonnet gravity (EGB) with a linear equation of state considering
a metric potential proposed for Buchdahl (1959). The new obtained models
satisfy all physical requirements of a physically reasonable stellar object. We
analyzed ... | [
{
"created": "Sat, 21 Jan 2023 02:34:20 GMT",
"version": "v1"
}
] | 2023-01-24 | [
[
"Malaver",
"Manuel",
""
],
[
"Iyer",
"Rajan",
""
],
[
"Khan",
"Israr",
""
]
] | In this paper, we have presented a compact object model in the framework of Einstein-Gauss-Bonnet gravity (EGB) with a linear equation of state considering a metric potential proposed for Buchdahl (1959). The new obtained models satisfy all physical requirements of a physically reasonable stellar object. We analyzed th... |
1904.09299 | Alankrita Priya | Cynthia Keeler, Alankrita Priya | Black hole one-loop determinants in the large dimension limit | 36 pages, 4 figures; v2: minor corrections, refs added, matches
published version | null | 10.1007/JHEP06(2020)099 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the contributions to the one-loop determinant for transverse
traceless gravitons in an $n+3$-dimensional Schwarzschild black hole background
in the large dimension limit, due to the $SO(n+2)$-type tensor and vector
fluctuations, using the quasinormal mode method. Accordingly we find the
quasinormal modes... | [
{
"created": "Fri, 19 Apr 2019 18:00:09 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jun 2020 05:15:13 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Keeler",
"Cynthia",
""
],
[
"Priya",
"Alankrita",
""
]
] | We calculate the contributions to the one-loop determinant for transverse traceless gravitons in an $n+3$-dimensional Schwarzschild black hole background in the large dimension limit, due to the $SO(n+2)$-type tensor and vector fluctuations, using the quasinormal mode method. Accordingly we find the quasinormal modes f... |
1006.0881 | Subenoy Chakraborty | Subenoy Chakraborty, Nairwita Mazumder, Ritabrata Biswas | Cosmological Evolution Across Phantom Crossing and the Nature of the
Horizon | 7 pages and 4 figures | Astrophys.Space Sci.334:183-186,2011 | 10.1007/s10509-011-0704-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In standard cosmology, with the evolution of the universe, the matter density
and thermodynamic pressure gradually decreases. Also in course of evolution,
the matter in the universe obeys (or violates) some restrictions or energy
conditions. If the matter distribution obeys strong energy condition (SEC), the
universe... | [
{
"created": "Fri, 4 Jun 2010 12:42:46 GMT",
"version": "v1"
}
] | 2011-06-10 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Mazumder",
"Nairwita",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | In standard cosmology, with the evolution of the universe, the matter density and thermodynamic pressure gradually decreases. Also in course of evolution, the matter in the universe obeys (or violates) some restrictions or energy conditions. If the matter distribution obeys strong energy condition (SEC), the universe i... |
gr-qc/0101066 | Hidetomo Yamazaki | Hidetomo Yamazaki | Dirac Decomposition of Wheeler-DeWitt Equation on the Bianchi Class A
Models | LaTeX, 14pages, no figures | null | null | null | gr-qc | null | The Wheeler-DeWitt equation for the Bianchi Class A cosmological models is
expressed generally in terms of the second-order differential equation like the
Klein-Gordon equation. To obtain the positive-definite probability density, a
new method extending the Dirac-Square-Root formalism, which factorizes the
Wheeler-De... | [
{
"created": "Wed, 17 Jan 2001 08:22:57 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2001 10:43:05 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jan 2001 10:35:38 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Yamazaki",
"Hidetomo",
""
]
] | The Wheeler-DeWitt equation for the Bianchi Class A cosmological models is expressed generally in terms of the second-order differential equation like the Klein-Gordon equation. To obtain the positive-definite probability density, a new method extending the Dirac-Square-Root formalism, which factorizes the Wheeler-DeWi... |
1510.02284 | Sunny Vagnozzi | Ratbay Myrzakulov, Lorenzo Sebastiani, Sunny Vagnozzi and Sergio
Zerbini | Static spherically symmetric solutions in mimetic gravity: rotation
curves & wormholes | Version accepted for publication in Class. Quant. Grav | Class. Quant. Grav. 33 (2016) 125005 | 10.1088/0264-9381/33/12/125005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we analyse static spherically symmetric solutions in the
framework of mimetic gravity, an extension of general relativity where the
conformal degree of freedom of gravity is isolated in a covariant fashion. Here
we extend previous works by considering in addition a potential for the mimetic
field. An ap... | [
{
"created": "Thu, 8 Oct 2015 11:43:29 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Nov 2015 21:06:26 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Nov 2015 20:31:03 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Jan 2016 17:20:41 GMT",
"version": "v4"
},
{
"cre... | 2018-12-13 | [
[
"Myrzakulov",
"Ratbay",
""
],
[
"Sebastiani",
"Lorenzo",
""
],
[
"Vagnozzi",
"Sunny",
""
],
[
"Zerbini",
"Sergio",
""
]
] | In this work, we analyse static spherically symmetric solutions in the framework of mimetic gravity, an extension of general relativity where the conformal degree of freedom of gravity is isolated in a covariant fashion. Here we extend previous works by considering in addition a potential for the mimetic field. An appr... |
1302.2786 | Jeremy Neveu | J. Neveu, V. Ruhlmann-Kleider, A. Conley, N. Palanque-Delabrouille, P.
Astier, J. Guy, E. Babichev | Experimental constraints on the uncoupled Galileon model from SNLS3 data
and other cosmological probes | 19 pages, 15 figures, accepted to Astronomy and Astrophysics | A&A 555, A53 (2013) | 10.1051/0004-6361/201321256 | LPT-Orsay 13-32 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Galileon model is a modified gravity theory that may provide an
explanation for the accelerated expansion of the Universe. This model does not
suffer from instabilities or ghost problems (normally associated with
higher-order derivative theories), restores local General Relativity -- thanks
to the Vainshtein scre... | [
{
"created": "Tue, 12 Feb 2013 13:33:50 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2013 10:15:26 GMT",
"version": "v2"
}
] | 2013-07-02 | [
[
"Neveu",
"J.",
""
],
[
"Ruhlmann-Kleider",
"V.",
""
],
[
"Conley",
"A.",
""
],
[
"Palanque-Delabrouille",
"N.",
""
],
[
"Astier",
"P.",
""
],
[
"Guy",
"J.",
""
],
[
"Babichev",
"E.",
""
]
] | The Galileon model is a modified gravity theory that may provide an explanation for the accelerated expansion of the Universe. This model does not suffer from instabilities or ghost problems (normally associated with higher-order derivative theories), restores local General Relativity -- thanks to the Vainshtein screen... |
0909.3048 | Peter Kazinski | P.O. Kazinski | One-loop effective potential of the Higgs field on the Schwarzschild
background | 25pp., 2 figures; considerable changes, correct path-integral measure
is used | Phys.Rev.D80:124020,2009 | 10.1103/PhysRevD.80.124020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A one-loop effective potential of the Higgs field on the Schwarzschild
background is derived in the framework of a toy model: a SO(N) scalar multiplet
interacting with the gauge fields, the SO(N) gauge symmetry being broken by the
Higgs mechanism. As expected, the potential depends on the space point and
results in a... | [
{
"created": "Wed, 16 Sep 2009 16:13:33 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Oct 2009 19:08:01 GMT",
"version": "v2"
}
] | 2010-03-25 | [
[
"Kazinski",
"P. O.",
""
]
] | A one-loop effective potential of the Higgs field on the Schwarzschild background is derived in the framework of a toy model: a SO(N) scalar multiplet interacting with the gauge fields, the SO(N) gauge symmetry being broken by the Higgs mechanism. As expected, the potential depends on the space point and results in a m... |
1404.0692 | Marcelo Ponce | Marcelo Ponce, Carlos Palenzuela, Luis Lehner, Steven L. Liebling | Interaction of misaligned magnetospheres in the coalescence of binary
neutron stars | 12 pages, 9 figures; matches version published in PRD | Phys. Rev. D 90, 044007 (2014) | 10.1103/PhysRevD.90.044007 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dependence of the electromagnetic luminosity --produced by
interactions of force-free magnetospheres-- on dipole inclinations in binary
neutron star systems. We show that this interaction extracts kinetic energy
from the system and powers a Poynting flux with a strong dependence on the
dipole orientation... | [
{
"created": "Wed, 2 Apr 2014 20:22:22 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Aug 2014 19:29:16 GMT",
"version": "v2"
}
] | 2014-08-06 | [
[
"Ponce",
"Marcelo",
""
],
[
"Palenzuela",
"Carlos",
""
],
[
"Lehner",
"Luis",
""
],
[
"Liebling",
"Steven L.",
""
]
] | We study the dependence of the electromagnetic luminosity --produced by interactions of force-free magnetospheres-- on dipole inclinations in binary neutron star systems. We show that this interaction extracts kinetic energy from the system and powers a Poynting flux with a strong dependence on the dipole orientations.... |
gr-qc/9708010 | Yasunori Fujii | Yasunori Fujii | Choosing a conformal frame in scalar-tensor theories of gravity with a
cosmological constant | Latex 29 pages, including 9 figures | Prog.Theor.Phys. 99 (1998) 599-622 | 10.1143/PTP.99.599 | null | gr-qc | null | Cosmological solutions of the Brans-Dicke theory with an added cosmological
constant are investigated with an emphasis to select a conformal frame in order
to implement the scenario of a decaying cosmological constant, featuring an
ever growing scalar field. We focus particularly on Jordan frame, the original
frame w... | [
{
"created": "Wed, 6 Aug 1997 09:20:43 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Fujii",
"Yasunori",
""
]
] | Cosmological solutions of the Brans-Dicke theory with an added cosmological constant are investigated with an emphasis to select a conformal frame in order to implement the scenario of a decaying cosmological constant, featuring an ever growing scalar field. We focus particularly on Jordan frame, the original frame wit... |
1912.08807 | Bence B\'ecsy | Bence B\'ecsy, Neil J. Cornish | Joint search for isolated sources and an unresolved confusion background
in pulsar timing array data | 19 pages, 6 figures, matches published version | Bence Becsy and Neil J. Cornish 2020 Class. Quantum Grav. 37
135011 | 10.1088/1361-6382/ab8bbd | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supermassive black hole binaries are the most promising source of
gravitational-waves in the frequency band accessible to pulsar timing arrays.
Most of these binaries will be too distant to detect individually, but together
they will form an approximately stochastic background that can be detected by
measuring the co... | [
{
"created": "Wed, 18 Dec 2019 18:59:53 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2020 23:44:23 GMT",
"version": "v2"
}
] | 2020-06-19 | [
[
"Bécsy",
"Bence",
""
],
[
"Cornish",
"Neil J.",
""
]
] | Supermassive black hole binaries are the most promising source of gravitational-waves in the frequency band accessible to pulsar timing arrays. Most of these binaries will be too distant to detect individually, but together they will form an approximately stochastic background that can be detected by measuring the corr... |
2304.10252 | Theo Torres | Theo Torres | From black hole spectral instability to stable observables | 5 + 3 pages, 4 + 2 figures, 1 table. Title changed. Matches the
accepted version in Phys. Rev. Lett | Phys. Rev. Lett. 131, 111401 (2023) | 10.1103/PhysRevLett.131.111401 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quasi-normal mode (QNM) spectrum of black holes is unstable under small
perturbation of the potential and has observational consequences in time
signals. Such signals might be experimentally difficult to observe and probing
this instability will be a technical challenge. Here we investigate the
spectral instabili... | [
{
"created": "Thu, 20 Apr 2023 12:21:10 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2023 12:27:21 GMT",
"version": "v2"
}
] | 2023-09-14 | [
[
"Torres",
"Theo",
""
]
] | The quasi-normal mode (QNM) spectrum of black holes is unstable under small perturbation of the potential and has observational consequences in time signals. Such signals might be experimentally difficult to observe and probing this instability will be a technical challenge. Here we investigate the spectral instability... |
2401.13251 | Oem Trivedi | Oem Trivedi and Maxim Khlopov | On rips and cosmological singularities in a universe merging with baby
universes | 13 pages with no figures, comments are very welcome ! | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Understanding the late-time acceleration of the universe and its subtleties
is one of the biggest mysteries in cosmology. A lot of different approaches
have been put forward to deal with this, ranging from the conventional
cosmological constant to various models of dark energy and beyond. Recently one
very interestin... | [
{
"created": "Wed, 24 Jan 2024 06:22:56 GMT",
"version": "v1"
}
] | 2024-01-25 | [
[
"Trivedi",
"Oem",
""
],
[
"Khlopov",
"Maxim",
""
]
] | Understanding the late-time acceleration of the universe and its subtleties is one of the biggest mysteries in cosmology. A lot of different approaches have been put forward to deal with this, ranging from the conventional cosmological constant to various models of dark energy and beyond. Recently one very interesting ... |
0907.3811 | Francisco Lobo | Francisco S. N. Lobo, Jos\'e P. Mimoso | Possibility of hyperbolic tunneling | 7 pages, 1 figure. V2: 8 pages, changes in title and throughout the
text; to appear in PRD | Phys.Rev.D82:044034,2010 | 10.1103/PhysRevD.82.044034 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Traversable wormhole are primarily useful as "gedanken-experiments" and as a
theoretician's probe of the foundations of general relativity. In this work, we
analyse the possibility of having tunnels in a hyperbolic spacetime. We obtain
exact solutions of static and pseudo-spherically symmetric spacetime tunnels by
ad... | [
{
"created": "Wed, 22 Jul 2009 10:39:45 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2010 16:50:52 GMT",
"version": "v2"
}
] | 2010-09-02 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mimoso",
"José P.",
""
]
] | Traversable wormhole are primarily useful as "gedanken-experiments" and as a theoretician's probe of the foundations of general relativity. In this work, we analyse the possibility of having tunnels in a hyperbolic spacetime. We obtain exact solutions of static and pseudo-spherically symmetric spacetime tunnels by addi... |
gr-qc/9809086 | Shestakova Tatyana P. | V. A. Savchenko, T. P. Shestakova, G. M. Vereshkov | Quantum geometrodynamics in extended phase space - I. Physical problems
of interpretation and mathematical problems of gauge invariance | LaTeX, 14 pages. A revised version: the comparison with the BFV
approach is given in details | Grav.Cosmol. 7 (2001) 18-28 | null | null | gr-qc | null | The paper is the first of two parts of the work devoted to the investigation
of constructing quantum theory of a closed universe as a system without
asynptotic states. In Part I the role of asymptotic states in quantum theory of
gravity is discussed, that enables us to argue that mathematically correct
quantum geomet... | [
{
"created": "Wed, 30 Sep 1998 12:09:15 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Nov 2000 14:20:43 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Savchenko",
"V. A.",
""
],
[
"Shestakova",
"T. P.",
""
],
[
"Vereshkov",
"G. M.",
""
]
] | The paper is the first of two parts of the work devoted to the investigation of constructing quantum theory of a closed universe as a system without asynptotic states. In Part I the role of asymptotic states in quantum theory of gravity is discussed, that enables us to argue that mathematically correct quantum geometro... |
gr-qc/0302016 | Pawel Nurowski | Ezra T Newman, Pawel Nurowski | Projective connections associated with second order ODEs | null | Class.Quant.Grav. 20 (2003) 2325-2336 | null | null | gr-qc | null | We show that every 2nd order ODE defines a 4-parameter family of projective
connections on its 2-dimensional solution space. In a special case of ODEs, for
which a certain point transformation invariant vanishes, we find that this
family of connections always has a preferred representative. This preferred
representat... | [
{
"created": "Wed, 5 Feb 2003 19:26:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Newman",
"Ezra T",
""
],
[
"Nurowski",
"Pawel",
""
]
] | We show that every 2nd order ODE defines a 4-parameter family of projective connections on its 2-dimensional solution space. In a special case of ODEs, for which a certain point transformation invariant vanishes, we find that this family of connections always has a preferred representative. This preferred representativ... |
0712.3328 | Yun-Song Piao | Yun-Song Piao | "Phantom" Inflation in Warped Compactification | 5 pages, 2 figures, some arguments on the reliability of our resulits
added, ref. added, to publish in PRD, matched to published version | Phys.Rev.D78:023518,2008 | 10.1103/PhysRevD.78.023518 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, in a class of warped compactifications with the brane/flux
annihilation, we find that the inflation may be driven by a flat direction
identified as that along the number p of anti D3-branes located at the tip of
the Klebanov-Strassler throat. The spectrum of adiabatic perturbation generated
during infl... | [
{
"created": "Thu, 20 Dec 2007 05:03:38 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 2008 13:20:22 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Sep 2008 08:04:17 GMT",
"version": "v3"
}
] | 2008-11-07 | [
[
"Piao",
"Yun-Song",
""
]
] | In this paper, in a class of warped compactifications with the brane/flux annihilation, we find that the inflation may be driven by a flat direction identified as that along the number p of anti D3-branes located at the tip of the Klebanov-Strassler throat. The spectrum of adiabatic perturbation generated during inflat... |
1402.2417 | Davood Momeni Dr | Davood Momeni, Surajit Chattopadhyay, Ratbay Myrzakulov | Reciprocal NUT spacetimes | Accepted in IJGMMP | Int.J.Geom.Meth.Mod.Phys. 12 (2015) no.09, 1550083 | 10.1142/S0219887815500838 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the \texttt{Ehlers' transformation} (sometimes called
gravitational duality rotation) for \texttt{reciprocal} static metrics. First
we introduce the concept of reciprocal metric. We prove a theorem which shows
how we can construct a certain new static solution of Einstein field equations
using... | [
{
"created": "Tue, 11 Feb 2014 10:01:46 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Apr 2015 04:29:17 GMT",
"version": "v2"
}
] | 2018-10-09 | [
[
"Momeni",
"Davood",
""
],
[
"Chattopadhyay",
"Surajit",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | In this paper, we study the \texttt{Ehlers' transformation} (sometimes called gravitational duality rotation) for \texttt{reciprocal} static metrics. First we introduce the concept of reciprocal metric. We prove a theorem which shows how we can construct a certain new static solution of Einstein field equations using a... |
1806.05888 | Andronikos Paliathanasis | Michael Tsamparlis and Andronikos Paliathanasis | Symmetries of Differential Equations in Cosmology | 44 pages, review article to appear in Symmetry | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of the current article is to present a brief albeit accurate
presentation of the main tools used in the study of symmetries of Lagrange
equations for holonomic systems and subsequently to show how these tools are
applied in the major models of modern cosmology in order to derive exact
solutions and deal w... | [
{
"created": "Fri, 15 Jun 2018 10:27:13 GMT",
"version": "v1"
}
] | 2018-06-18 | [
[
"Tsamparlis",
"Michael",
""
],
[
"Paliathanasis",
"Andronikos",
""
]
] | The purpose of the current article is to present a brief albeit accurate presentation of the main tools used in the study of symmetries of Lagrange equations for holonomic systems and subsequently to show how these tools are applied in the major models of modern cosmology in order to derive exact solutions and deal wit... |
gr-qc/0606047 | Djamal Dou | A.S. Al-Rawaf | Modified GR and Helium Nucleosynthesis | 5 pages | Int.J.Mod.Phys. D14 (2005) 1941-1945 | 10.1142/S021827180500753X | null | gr-qc | null | We show that a previously proposed cosmological model based on general
relativity with non vanishing divergence for the energy-momentum tensor is
consistent with the observed values for the nucleosynthesis of helium for some
values of the arbitrary parameter $\alpha$ presented in this model. Further
more values of $\... | [
{
"created": "Mon, 12 Jun 2006 13:26:12 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Al-Rawaf",
"A. S.",
""
]
] | We show that a previously proposed cosmological model based on general relativity with non vanishing divergence for the energy-momentum tensor is consistent with the observed values for the nucleosynthesis of helium for some values of the arbitrary parameter $\alpha$ presented in this model. Further more values of $\al... |
1404.5288 | Sebastian Steinhaus | Bianca Dittrich, Wojciech Kaminski, Sebastian Steinhaus | Discretization independence implies non-locality in 4D discrete quantum
gravity | 18 pages, 6 figures; added references and clarifications | Class. Quant. Grav. 31 (2014) 245009 | 10.1088/0264-9381/31/24/245009 | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 4D Regge action is invariant under 5--1 and 4--2 Pachner moves, which
define a subset of (local) changes of the triangulation. Given this fact one
might hope to find a local path integral measure that makes the quantum theory
invariant under these moves and hence makes the theory partially triangulation
invariant... | [
{
"created": "Mon, 21 Apr 2014 19:48:50 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2014 14:57:45 GMT",
"version": "v2"
}
] | 2014-12-01 | [
[
"Dittrich",
"Bianca",
""
],
[
"Kaminski",
"Wojciech",
""
],
[
"Steinhaus",
"Sebastian",
""
]
] | The 4D Regge action is invariant under 5--1 and 4--2 Pachner moves, which define a subset of (local) changes of the triangulation. Given this fact one might hope to find a local path integral measure that makes the quantum theory invariant under these moves and hence makes the theory partially triangulation invariant. ... |
0803.2760 | Shuang Wang | Shuang Wang, Yang Zhang, and Tian-Yang Xia | 3-loop Yang-Mills Condensate Dark Energy Model And Its Cosmological
Constraints | 23 Pages, 8 Figures, 1 Table, Accepted for Publication in JCAP | JCAP0810:037,2008 | 10.1088/1475-7516/2008/10/037 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is a comprehensive investigation of the Yang-Mills condensate (YMC)
dark energy (DE) model, which is extended to include the 3-loop quantum
corrections. We study its cosmic evolution and the possibility of crossing
phantom divide $w=-1$, examine in details the Hubble parameter $H$, the
deceleration paramete... | [
{
"created": "Wed, 19 Mar 2008 14:26:59 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Sep 2008 07:52:06 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Oct 2008 05:57:07 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Wang",
"Shuang",
""
],
[
"Zhang",
"Yang",
""
],
[
"Xia",
"Tian-Yang",
""
]
] | This work is a comprehensive investigation of the Yang-Mills condensate (YMC) dark energy (DE) model, which is extended to include the 3-loop quantum corrections. We study its cosmic evolution and the possibility of crossing phantom divide $w=-1$, examine in details the Hubble parameter $H$, the deceleration parameter ... |
gr-qc/0510093 | Charles Hellaby | Charles Hellaby and Andrzej Krasinski | Alternative Methods of Describing Structure Formation in the
Lemaitre-Tolman Model | Accepted by Phys Rev D. RevTeX 4, 13 pages, no figures. Part of a
series: gr-qc/0106096, gr-qc/0303016, gr-qc/0309119. Replacement contains
very minor corrections | Phys.Rev.D73:023518,2006 | 10.1103/PhysRevD.73.023518 | null | gr-qc | null | We describe several new ways of specifying the behaviour of Lemaitre-Tolman
(LT) models, in each case presenting the method for obtaining the LT arbitrary
functions from the given data, and the conditions for existence of such
solutions. In addition to our previously considered `boundary conditions', the
new ones inc... | [
{
"created": "Thu, 20 Oct 2005 07:49:08 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2005 08:57:07 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hellaby",
"Charles",
""
],
[
"Krasinski",
"Andrzej",
""
]
] | We describe several new ways of specifying the behaviour of Lemaitre-Tolman (LT) models, in each case presenting the method for obtaining the LT arbitrary functions from the given data, and the conditions for existence of such solutions. In addition to our previously considered `boundary conditions', the new ones inclu... |
1711.01730 | Hideki Asada | Hideki Asada | Gravitational lensing by exotic objects | 21 pages, 3 figures, manuscript for a review for MPLA | Mod. Phys. Lett. A, 32, 1730031 (2017) | 10.1142/S0217732317300312 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper reviews a phenomenological approach to the gravitational lensing
by exotic objects such as the Ellis wormhole lens, where exotic lens objects
may follow a non-standard form of the equation of state or may obey a modified
gravity theory. A gravitational lens model is proposed in the inverse powers of
the di... | [
{
"created": "Mon, 6 Nov 2017 05:09:03 GMT",
"version": "v1"
}
] | 2017-11-07 | [
[
"Asada",
"Hideki",
""
]
] | This paper reviews a phenomenological approach to the gravitational lensing by exotic objects such as the Ellis wormhole lens, where exotic lens objects may follow a non-standard form of the equation of state or may obey a modified gravity theory. A gravitational lens model is proposed in the inverse powers of the dist... |
0801.0482 | Jungjai Lee | Gungwon Kang, Hyeong-Chan Kim, and Jungjai Lee | Geometrical properties of the trans-spherical solutions in higher
dimensions | 14 pages, 2 figures, Title changed | Phys. Rev. D 79, 124030 (2009) | 10.1103/PhysRevD.79.124030 | KIAS-0801 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the geometrical properties of static vacuum $p$-brane
solutions of Einstein gravity in $D=n+p+3$ dimensions, which have spherical
symmetry of $S^{n+1}$ orthogonal to the $p$-directions and are invariant under
the translation along them. % The solutions are characterized by mass density
and $p$ tension ... | [
{
"created": "Thu, 3 Jan 2008 07:02:29 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Nov 2008 10:55:52 GMT",
"version": "v2"
},
{
"created": "Wed, 27 May 2009 12:44:00 GMT",
"version": "v3"
}
] | 2009-07-31 | [
[
"Kang",
"Gungwon",
""
],
[
"Kim",
"Hyeong-Chan",
""
],
[
"Lee",
"Jungjai",
""
]
] | We investigate the geometrical properties of static vacuum $p$-brane solutions of Einstein gravity in $D=n+p+3$ dimensions, which have spherical symmetry of $S^{n+1}$ orthogonal to the $p$-directions and are invariant under the translation along them. % The solutions are characterized by mass density and $p$ tension de... |
1001.4188 | Hanno Sahlmann | Hanno Sahlmann | Loop quantum gravity - a short review | 23 pages, 7 figures, talk delivered at the workshop "Foundations of
Space and Time - Reflections on Quantum Gravity" in honor of George Ellis,
STIAS, Stellenbosch, South Africa, 10-14 August 2009. v3: bibliography
updated, typos removed, some additional comments | null | null | KA-TP-19-2009 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we review the foundations and the present status of loop
quantum gravity. It is short and relatively non-technical, the emphasis is on
the ideas, and the flavor of the techniques. In particular, we describe the
kinematical quantization and the implementation of the Hamilton constraint, as
well as the ... | [
{
"created": "Sat, 23 Jan 2010 18:58:32 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2011 13:14:23 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Feb 2011 06:21:25 GMT",
"version": "v3"
}
] | 2011-02-02 | [
[
"Sahlmann",
"Hanno",
""
]
] | In this article we review the foundations and the present status of loop quantum gravity. It is short and relatively non-technical, the emphasis is on the ideas, and the flavor of the techniques. In particular, we describe the kinematical quantization and the implementation of the Hamilton constraint, as well as the qu... |
2104.13158 | Zhaoyi Xu | Zhaoyi Xu and Jiancheng Wang | Deformed black hole immersed in dark matter spike | 10 pages, 2 figures | null | 10.1088/1475-7516/2021/09/007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If a lot of dark matter particles accumulate near the black hole, then the
chances of detecting dark matter signals near a black hole are greatly
increased. These effects may be observed by the Event Horizon Telescope (EHT),
Tianqin project, Taiji project, Laser Interferometer Space Antenna (LISA) and
Laser Interfero... | [
{
"created": "Tue, 27 Apr 2021 13:07:28 GMT",
"version": "v1"
}
] | 2021-09-29 | [
[
"Xu",
"Zhaoyi",
""
],
[
"Wang",
"Jiancheng",
""
]
] | If a lot of dark matter particles accumulate near the black hole, then the chances of detecting dark matter signals near a black hole are greatly increased. These effects may be observed by the Event Horizon Telescope (EHT), Tianqin project, Taiji project, Laser Interferometer Space Antenna (LISA) and Laser Interferome... |
2312.04320 | Wen-Biao Han | Ye Jiang and Wen-Biao Han | Resolving "dirty" effects around black holes by decoupling the Teukolsky
equation | 6 pages + supplementary materials, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detecting the environment around the supermassive black holes and tests of
general relativity are important applications of extreme-mass-ratio inspirals
(EMRIs). There is still a challenge to efficiently describe various "dirty"
impacts on the inspirals like dark matter, gas, dipole radiation,
electromagnetic interac... | [
{
"created": "Thu, 7 Dec 2023 14:26:33 GMT",
"version": "v1"
}
] | 2023-12-08 | [
[
"Jiang",
"Ye",
""
],
[
"Han",
"Wen-Biao",
""
]
] | Detecting the environment around the supermassive black holes and tests of general relativity are important applications of extreme-mass-ratio inspirals (EMRIs). There is still a challenge to efficiently describe various "dirty" impacts on the inspirals like dark matter, gas, dipole radiation, electromagnetic interacti... |
1408.5259 | Andrea Geralico | Donato Bini, Andrea Geralico, Robert T. Jantzen | Separable geodesic action slicing in stationary spacetimes | 17 pages, 1 figure; published version | Gen. Relativ. Gravit. 44, 603 (2012) | 10.1007/s10714-011-1295-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple observation about the action for geodesics in a stationary spacetime
with separable geodesic equations leads to a natural class of slicings of that
spacetime whose orthogonal geodesic trajectories represent freely falling
observers. The time coordinate function can then be taken to be the observer
proper tim... | [
{
"created": "Fri, 22 Aug 2014 10:50:49 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Jantzen",
"Robert T.",
""
]
] | A simple observation about the action for geodesics in a stationary spacetime with separable geodesic equations leads to a natural class of slicings of that spacetime whose orthogonal geodesic trajectories represent freely falling observers. The time coordinate function can then be taken to be the observer proper time,... |
2304.09025 | Tao Zhu | Tao Zhu, Wen Zhao, Jian-Ming Yan, Cheng Gong, and Anzhong Wang | Tests of modified gravitational wave propagations with gravitational
waves | 6 pages, 3 tables, and 1 figure | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Any violation of the fundamental principles of general relativity (GR),
including the violations of the equivalence principle and parity/Lorentz
symmetries, could induce possible derivations in the gravitational wave (GW)
propagations so they can be tested/constrained directly by the GW data. In this
letter, we prese... | [
{
"created": "Tue, 18 Apr 2023 14:38:04 GMT",
"version": "v1"
}
] | 2023-04-19 | [
[
"Zhu",
"Tao",
""
],
[
"Zhao",
"Wen",
""
],
[
"Yan",
"Jian-Ming",
""
],
[
"Gong",
"Cheng",
""
],
[
"Wang",
"Anzhong",
""
]
] | Any violation of the fundamental principles of general relativity (GR), including the violations of the equivalence principle and parity/Lorentz symmetries, could induce possible derivations in the gravitational wave (GW) propagations so they can be tested/constrained directly by the GW data. In this letter, we present... |
gr-qc/9404016 | David Garfinkle | David Garfinkle and M.A. Melvin | Generating new magnetic universe solutions from old | 17 pages | Phys.Rev. D50 (1994) 3859-3866 | 10.1103/PhysRevD.50.3859 | null | gr-qc | null | In this paper we apply the techniques which have been developed over the last
few decades for generating nontrivially new solutions of the Einstein-Maxwell
equations from seed solutions for simple spacetimes. The simple seed spacetime
which we choose is the "magnetic universe" to which we apply the Ehlers
transformat... | [
{
"created": "Sun, 10 Apr 1994 21:44:50 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Garfinkle",
"David",
""
],
[
"Melvin",
"M. A.",
""
]
] | In this paper we apply the techniques which have been developed over the last few decades for generating nontrivially new solutions of the Einstein-Maxwell equations from seed solutions for simple spacetimes. The simple seed spacetime which we choose is the "magnetic universe" to which we apply the Ehlers transformatio... |
1006.3146 | Gilberto Medeiros Kremer | Rudinei C. de Souza and Gilberto M. Kremer | Dark Sector from Interacting Canonical and Non-Canonical Scalar Fields | 20 pages, 13 figures, correction of misprints in eqs. (4), (5), (43),
(44) | Class.Quant.Grav.27:175006,2010 | 10.1088/0264-9381/27/17/175006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work it is investigated general models with interactions between two
canonical scalar fields and between one non-canonical (tachyon-type) and one
canonical scalar field. The potentials and couplings to the gravity are
selected through the Noether symmetry approach. These general models are
employed to describ... | [
{
"created": "Wed, 16 Jun 2010 07:34:43 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Oct 2013 08:26:45 GMT",
"version": "v2"
}
] | 2013-10-15 | [
[
"de Souza",
"Rudinei C.",
""
],
[
"Kremer",
"Gilberto M.",
""
]
] | In this work it is investigated general models with interactions between two canonical scalar fields and between one non-canonical (tachyon-type) and one canonical scalar field. The potentials and couplings to the gravity are selected through the Noether symmetry approach. These general models are employed to describe ... |
gr-qc/9809062 | David Wands | David Wands | Duality Invariance of Cosmological Perturbation Spectra | 5 pages, Latex with Revtex. Hamiltonian formulation added and
discussion expanded. Version to appear in Phys Rev D | Phys.Rev. D60 (1999) 023507 | 10.1103/PhysRevD.60.023507 | PU-RCG/98-15 | gr-qc astro-ph hep-th | null | I show that cosmological perturbation spectra produced from quantum
fluctuations in massless or self-interacting scalar fields during an
inflationary era remain invariant under a two parameter family of
transformations of the homogeneous background fields. This relates slow-roll
inflation models to solutions which ma... | [
{
"created": "Tue, 22 Sep 1998 13:28:00 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 1999 07:52:14 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Wands",
"David",
""
]
] | I show that cosmological perturbation spectra produced from quantum fluctuations in massless or self-interacting scalar fields during an inflationary era remain invariant under a two parameter family of transformations of the homogeneous background fields. This relates slow-roll inflation models to solutions which may ... |
gr-qc/9907067 | J. Frauendiener | J\"org Frauendiener and George A. J. Sparling | Local twistors and the conformal field equations | LaTeX2e Minor corrections of misprints etc | J.Math.Phys. 41 (2000) 437-443 | 10.1063/1.533139 | null | gr-qc | null | This note establishes the connection between Friedrich's conformal field
equations and the conformally invariant formalism of local twistors.
| [
{
"created": "Wed, 21 Jul 1999 15:41:55 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 1999 23:39:05 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Frauendiener",
"Jörg",
""
],
[
"Sparling",
"George A. J.",
""
]
] | This note establishes the connection between Friedrich's conformal field equations and the conformally invariant formalism of local twistors. |
1303.5669 | Timoshkin Alexandr V | I. Brevik, V. Obukhov, A. Timoshkin | Quasi-Rip universe induced by the fluid with inhomogeneous equation of
state | 3 pages, Proceedings of the Conference "Quantum Field Theory and
Gravity", TSPU, July 31-August 4 | TSPU Bulletin, 2012.13(128), p. 42-45 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a specific model for dark energy, which lead to the Quasi-Rip
cosmology. In the Quasi-Rip model, the equation of the state parameter $w$ is
less than -1 in the first stage, but then in the second stage is larger than
-1. The conditions for the appearance the Quasi-Rip in the terms of the
parameters equ... | [
{
"created": "Fri, 22 Mar 2013 17:27:04 GMT",
"version": "v1"
}
] | 2013-03-25 | [
[
"Brevik",
"I.",
""
],
[
"Obukhov",
"V.",
""
],
[
"Timoshkin",
"A.",
""
]
] | We investigate a specific model for dark energy, which lead to the Quasi-Rip cosmology. In the Quasi-Rip model, the equation of the state parameter $w$ is less than -1 in the first stage, but then in the second stage is larger than -1. The conditions for the appearance the Quasi-Rip in the terms of the parameters equat... |
gr-qc/0611084 | Xin Zhang | M. R. Setare, Jingfei Zhang and Xin Zhang | Statefinder diagnosis in a non-flat universe and the holographic model
of dark energy | 16 pages, 4 figures; final version | JCAP 0703:007,2007 | 10.1088/1475-7516/2007/03/007 | null | gr-qc | null | In this paper, we study the holographic dark energy model in non-flat
universe from the statefinder viewpoint. We plot the evolutionary trajectories
of the holographic dark energy model for different values of the parameter $c$
as well as for different contributions of spatial curvature, in the statefinder
parameter-... | [
{
"created": "Wed, 15 Nov 2006 14:57:11 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2006 08:07:40 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Dec 2006 03:05:04 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Feb 2007 08:15:16 GMT",
"version": "v4"
},
{
"c... | 2010-10-27 | [
[
"Setare",
"M. R.",
""
],
[
"Zhang",
"Jingfei",
""
],
[
"Zhang",
"Xin",
""
]
] | In this paper, we study the holographic dark energy model in non-flat universe from the statefinder viewpoint. We plot the evolutionary trajectories of the holographic dark energy model for different values of the parameter $c$ as well as for different contributions of spatial curvature, in the statefinder parameter-pl... |
1511.08036 | Kirill Bronnikov | K.A. Bronnikov, J.C. Fabris, D.C. Rodrigues | On horizons and wormholes in k-essence theories | 7 pages, 2 figures | Grav. Cosmol. 22 (1) 26-31 (2016) | 10.1134/S0202289316010035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of possible static, spherically symmetric
configurations in k-essence theories with the Lagrangian functions of the form
$F(X)$, $X \equiv \phi_{,\alpha} \phi^{,\alpha}$. A no-go theorem has been
proved, claiming that a possible black-hole-like Killing horizon of finite
radius cannot exist if ... | [
{
"created": "Wed, 25 Nov 2015 12:43:28 GMT",
"version": "v1"
}
] | 2016-04-27 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Rodrigues",
"D. C.",
""
]
] | We study the properties of possible static, spherically symmetric configurations in k-essence theories with the Lagrangian functions of the form $F(X)$, $X \equiv \phi_{,\alpha} \phi^{,\alpha}$. A no-go theorem has been proved, claiming that a possible black-hole-like Killing horizon of finite radius cannot exist if th... |
2406.03244 | Valerie Fiona Domcke | Valerie Domcke and Joachim Kopp | Electromagnetic (high-frequency) gravitational wave detectors:
Interferometers revisited | Contribution to the 2024 Cosmology session of the 58th Rencontres de
Moriond. 8 pages | null | null | CERN-TH-2024-082 | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Increased interest in pushing the frontier of gravitational wave searches to
higher frequencies (kHz and beyond) has resulted in a variety of different
proposed experimental concepts. A significant fraction of them are based on the
coupling between classical electromagnetism and gravity. We highlight some
differences... | [
{
"created": "Wed, 5 Jun 2024 13:21:40 GMT",
"version": "v1"
}
] | 2024-06-06 | [
[
"Domcke",
"Valerie",
""
],
[
"Kopp",
"Joachim",
""
]
] | Increased interest in pushing the frontier of gravitational wave searches to higher frequencies (kHz and beyond) has resulted in a variety of different proposed experimental concepts. A significant fraction of them are based on the coupling between classical electromagnetism and gravity. We highlight some differences a... |
1608.04729 | Ernesto F. Eiroa | Ernesto F. Eiroa, Emilio Rubin de Celis, Claudio Simeone | Thin shells joining local cosmic string geometries | 9 pages, no figures; v2: improved version, new references added | Eur. Phys. J. C (2016) 76:546 | 10.1140/epjc/s10052-016-4401-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we present a theoretical construction of spacetimes with a
thin shell that joins two different local cosmic string geometries. We study
two types of global manifolds, one representing spacetimes with a thin shell
surrounding a cosmic string or an empty region with Minkowski metric, and the
other corre... | [
{
"created": "Tue, 16 Aug 2016 19:50:02 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 2016 18:08:59 GMT",
"version": "v2"
}
] | 2016-10-13 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"de Celis",
"Emilio Rubin",
""
],
[
"Simeone",
"Claudio",
""
]
] | In this article we present a theoretical construction of spacetimes with a thin shell that joins two different local cosmic string geometries. We study two types of global manifolds, one representing spacetimes with a thin shell surrounding a cosmic string or an empty region with Minkowski metric, and the other corresp... |
gr-qc/0211077 | Peter Huber | Peter Huber | A Cosmologic Model Based on the Equivalence of Expansion and Light
Retardation | 31 pages | null | null | null | gr-qc | null | Proceeding from a homogeneous and isotropic Friedmann universe a conceptional
problem concerning light propagation in an expanding universe is brought up. As
a possible solution of this problem it is suggested that light waves do not
scale with R(t). With the aid of a Generalized Equivalence Principle a
cosmologic mo... | [
{
"created": "Sun, 24 Nov 2002 14:24:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Huber",
"Peter",
""
]
] | Proceeding from a homogeneous and isotropic Friedmann universe a conceptional problem concerning light propagation in an expanding universe is brought up. As a possible solution of this problem it is suggested that light waves do not scale with R(t). With the aid of a Generalized Equivalence Principle a cosmologic mode... |
2006.01618 | Souvik Ghose | A. Saha and S. Ghose | Interacting Tsallis holographic dark energy in higher dimensional
Cosmology | 7 pages, 7 figures, prepared for Astronomy and Space Science. To be
published on Astronomy and Space Science | Astrophys Space Sci 365, 98 (2020) | 10.1007/s10509-020-03812-7 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss Tsallis holographic dark energy (THDE) model in higher dimension.
An interacting dark energy model is proposed with Generalized Chaplygin Gas
(GCG) in the framework of Compact Kaluza-Klein gravity. It is shown that a
stable configuration can be found in the present epoch which is also compatible
with the o... | [
{
"created": "Sat, 30 May 2020 09:15:16 GMT",
"version": "v1"
}
] | 2020-06-11 | [
[
"Saha",
"A.",
""
],
[
"Ghose",
"S.",
""
]
] | We discuss Tsallis holographic dark energy (THDE) model in higher dimension. An interacting dark energy model is proposed with Generalized Chaplygin Gas (GCG) in the framework of Compact Kaluza-Klein gravity. It is shown that a stable configuration can be found in the present epoch which is also compatible with the obs... |
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