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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1611.04284 | Parthapratim Pradhan | Parthapratim Pradhan | Thermodynamic Volume Product in Spherically Symmetric and Axisymmetric
Spacetime | 19 pages, Invited Article, Accepted in Advances in High Energy
Physics, 2018 | null | 10.1155/2018/5816826 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Letter, we have examined the thermodynamic volume products for
spherically symmetric and axisymmetric spacetimes in the framework of
\emph{extended phase space}. Such volume products usually formulated in terms
of the outer horizon~(${\cal H}^{+}$) and the inner horizon~(${\cal H}^{-}$) of
black hole ~ (BH) s... | [
{
"created": "Mon, 14 Nov 2016 08:39:26 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jun 2018 16:19:19 GMT",
"version": "v2"
}
] | 2018-06-19 | [
[
"Pradhan",
"Parthapratim",
""
]
] | In this Letter, we have examined the thermodynamic volume products for spherically symmetric and axisymmetric spacetimes in the framework of \emph{extended phase space}. Such volume products usually formulated in terms of the outer horizon~(${\cal H}^{+}$) and the inner horizon~(${\cal H}^{-}$) of black hole ~ (BH) spa... |
2311.12362 | Shu-Min Wu | Shu-Min Wu, Xiao-Wei Teng, Jin-Xuan Li, Si-Han Li, Tong-Hua Liu,
Jie-Ci Wang | Genuinely accessible and inaccessible entanglement in Schwarzschild
black hole | 14 pages, 1 figure | Phys. Lett. B 848 (2024) 138334 | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | The genuine entanglement of Dirac fields for an N-partite system is
investigated in Schwarzschild spacetime and the analysis is carried out using
the single-mode approximation. Due to the Hawking effect, quantum entanglement
is divided into two parts physically accessible and inaccessible entanglement.
We obtain a ge... | [
{
"created": "Tue, 21 Nov 2023 05:47:24 GMT",
"version": "v1"
}
] | 2023-11-22 | [
[
"Wu",
"Shu-Min",
""
],
[
"Teng",
"Xiao-Wei",
""
],
[
"Li",
"Jin-Xuan",
""
],
[
"Li",
"Si-Han",
""
],
[
"Liu",
"Tong-Hua",
""
],
[
"Wang",
"Jie-Ci",
""
]
] | The genuine entanglement of Dirac fields for an N-partite system is investigated in Schwarzschild spacetime and the analysis is carried out using the single-mode approximation. Due to the Hawking effect, quantum entanglement is divided into two parts physically accessible and inaccessible entanglement. We obtain a gene... |
1507.00612 | Yu Shi | Yue Dai, Zhejun Shen, Yu Shi | Killing quantum entanglement by acceleration or a black hole | 14 pages | JHEP 09 (2015) 071 | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider two entangled accelerating qubits coupled with real scalar
fields, each described by the Unruh-Wald model. It is demonstrated that because
of the Unruh effect, the bipartite entanglement of the two qubits suddenly dies
when the acceleration of one or more qubits are large enough. We also consider
three en... | [
{
"created": "Thu, 2 Jul 2015 15:05:02 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 2015 14:10:47 GMT",
"version": "v2"
}
] | 2015-12-15 | [
[
"Dai",
"Yue",
""
],
[
"Shen",
"Zhejun",
""
],
[
"Shi",
"Yu",
""
]
] | We consider two entangled accelerating qubits coupled with real scalar fields, each described by the Unruh-Wald model. It is demonstrated that because of the Unruh effect, the bipartite entanglement of the two qubits suddenly dies when the acceleration of one or more qubits are large enough. We also consider three enta... |
2407.15968 | Matteo Luca Ruggiero | Matteo Luca Ruggiero | Quantum two-level systems and gravitational waves | 14 pages, LaTeX | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the interaction between gravitational waves and a quantum two-level
system consisting of a spin 1/2 particle using the formalism of the proper
detector frame. This approach highlights the effects of gravitational waves on
both the particles and the observer, emphasizing that only relative
measurements can be... | [
{
"created": "Mon, 22 Jul 2024 18:28:53 GMT",
"version": "v1"
}
] | 2024-07-24 | [
[
"Ruggiero",
"Matteo Luca",
""
]
] | We study the interaction between gravitational waves and a quantum two-level system consisting of a spin 1/2 particle using the formalism of the proper detector frame. This approach highlights the effects of gravitational waves on both the particles and the observer, emphasizing that only relative measurements can be m... |
gr-qc/9803084 | Plamen Fiziev | T. Boyadjiev, P. Fiziev, S. Yazadjiev | Neutron star in presence of torsion-dilaton field | 29 pages, latex, 24 figures, final version. Added: 1)comments on
different possible mass definitions; 2)new sections: a)the inconsistency of
the Saa's model with Roll-Krotkov-Dicke and Braginsky-Panov experiments;
b)stability analysis via catastrophe theory; 3)new figers added and some
figures replaced. 4)new r... | Class.Quant.Grav.16:2359-2380,1999 | 10.1088/0264-9381/16/7/314 | SU-FzF: 2/98 | gr-qc astro-ph nucl-th | null | We develop the general theory of stars in Saa's model of gravity with
propagating torsion and study the basic stationary state of neutron star. Our
numerical results show that the torsion force decreases the role of the gravity
in the star configuration leading to significant changes in the neutron star
masses depend... | [
{
"created": "Thu, 26 Mar 1998 09:25:00 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 1998 06:27:42 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Jul 1999 08:24:08 GMT",
"version": "v3"
}
] | 2010-11-19 | [
[
"Boyadjiev",
"T.",
""
],
[
"Fiziev",
"P.",
""
],
[
"Yazadjiev",
"S.",
""
]
] | We develop the general theory of stars in Saa's model of gravity with propagating torsion and study the basic stationary state of neutron star. Our numerical results show that the torsion force decreases the role of the gravity in the star configuration leading to significant changes in the neutron star masses dependin... |
2104.13115 | Umananda Dev Goswami | Dhruba Jyoti Gogoi, Umananda Dev Goswami | Quasinormal Modes of Black Holes with Non-Linear-Electrodynamic sources
in Rastall Gravity | 24 pages, 20 figures; Title is changed slightly; Added some
explanations; This is the accepted version in Physics of the Dark Universe | Physics of the Dark Universe 33, 100860 (2021) | 10.1016/j.dark.2021.100860 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | One of the notable modifications of General Relativity (GR) is the Rastall
gravity. We have studied the polarization modes of Gravitational Waves (GWs) in
this gravity. It is found that at a very far distance away from the source of
GWs, Rastall gravity behaves identically to GR. That is, we get only two
massless ten... | [
{
"created": "Tue, 27 Apr 2021 11:30:06 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jul 2021 13:03:26 GMT",
"version": "v2"
}
] | 2021-08-03 | [
[
"Gogoi",
"Dhruba Jyoti",
""
],
[
"Goswami",
"Umananda Dev",
""
]
] | One of the notable modifications of General Relativity (GR) is the Rastall gravity. We have studied the polarization modes of Gravitational Waves (GWs) in this gravity. It is found that at a very far distance away from the source of GWs, Rastall gravity behaves identically to GR. That is, we get only two massless tenso... |
2304.08019 | Yongqiang Wang | Tian-Xiang Ma, Chen Liang, Jie Yang, Yong-Qiang Wang | Hybrid Proca-boson stars | 29 pages, 14 figures. arXiv admin note: text overlap with
arXiv:2207.11147 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we construct a hybrid boson star model that contains a complex
scalar field and a Proca field. The scalar field is in the ground state, while
the Proca field is in the first excited state. We numerically solve the model
and obtain solution families of different coexisting states by considering both
syn... | [
{
"created": "Mon, 17 Apr 2023 06:56:10 GMT",
"version": "v1"
}
] | 2023-04-18 | [
[
"Ma",
"Tian-Xiang",
""
],
[
"Liang",
"Chen",
""
],
[
"Yang",
"Jie",
""
],
[
"Wang",
"Yong-Qiang",
""
]
] | In this paper, we construct a hybrid boson star model that contains a complex scalar field and a Proca field. The scalar field is in the ground state, while the Proca field is in the first excited state. We numerically solve the model and obtain solution families of different coexisting states by considering both synch... |
gr-qc/0207060 | Sawa Manoff | Sawa Manoff and Bogdan Dimitrov | Flows and particles with shear-free and expansion-free velocities in
(L^-_n,g)- and Weyl's spaces | 20 pages, LaTeX, to appear in Classical and Quantum Gravity. arXiv
admin note: substantial text overlap with arXiv:gr-qc/0011045 | Class.Quant.Grav. 19 (2002) 4377-4398 | 10.1088/0264-9381/19/16/311 | null | gr-qc | null | Conditions for the existence of flows with non-null shear-free and
expansion-free velocities in spaces with affine connections and metrics are
found. On their basis, generalized Weyl's spaces with shear-free and
expansion-free conformal Killing vectors as velocity's vectors of spinless test
particles moving in a Weyl... | [
{
"created": "Tue, 16 Jul 2002 10:52:22 GMT",
"version": "v1"
}
] | 2012-07-10 | [
[
"Manoff",
"Sawa",
""
],
[
"Dimitrov",
"Bogdan",
""
]
] | Conditions for the existence of flows with non-null shear-free and expansion-free velocities in spaces with affine connections and metrics are found. On their basis, generalized Weyl's spaces with shear-free and expansion-free conformal Killing vectors as velocity's vectors of spinless test particles moving in a Weyl's... |
gr-qc/0104077 | Carl E. Dolby | Carl E. Dolby, Stephen F. Gull | On Radar Time and the Twin `Paradox' | 9 pages, 10 figures. Minor changes (includes minor corrections not in
published version) | Am.J.Phys. 69 (2001) 1257-1261 | 10.1119/1.1407254 | null | gr-qc hep-th | null | In this paper we apply the concept of radar time (popularised by Bondi in his
work on k-calculus) to the well-known relativistic twin `paradox'. Radar time
is used to define hypersurfaces of simultaneity for a class of travelling
twins, from the `Immediate Turn-around' case, through the `Gradual Turn-around'
case, to... | [
{
"created": "Tue, 24 Apr 2001 15:25:21 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2002 13:33:50 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Dolby",
"Carl E.",
""
],
[
"Gull",
"Stephen F.",
""
]
] | In this paper we apply the concept of radar time (popularised by Bondi in his work on k-calculus) to the well-known relativistic twin `paradox'. Radar time is used to define hypersurfaces of simultaneity for a class of travelling twins, from the `Immediate Turn-around' case, through the `Gradual Turn-around' case, to t... |
1710.08198 | Boris Latosh | Andrej Arbuzov, Boris Latosh | Conformally Coupled General Relativity | 20 pages | Universe 2018, 4(2), 38 | 10.3390/universe4020038 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravity model developed in the series of papers
\cite{Arbuzov:2009zza,Arbuzov:2010fz,Pervushin:2011gz} is revisited. Model is
based on Ogievetsky theorem that specifies structure of general coordinate
transformation group. The theorem is implemented in the context of Noether
theorem with the use of nonlinear represen... | [
{
"created": "Mon, 23 Oct 2017 10:59:05 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2018 09:31:43 GMT",
"version": "v2"
}
] | 2018-02-15 | [
[
"Arbuzov",
"Andrej",
""
],
[
"Latosh",
"Boris",
""
]
] | Gravity model developed in the series of papers \cite{Arbuzov:2009zza,Arbuzov:2010fz,Pervushin:2011gz} is revisited. Model is based on Ogievetsky theorem that specifies structure of general coordinate transformation group. The theorem is implemented in the context of Noether theorem with the use of nonlinear representa... |
gr-qc/0605078 | Matteo Carrera | Matteo Carrera and Domenico Giulini | On Doppler tracking in cosmological spacetimes | 10 pages, 1 figure. Journal version | Class.Quant.Grav. 23 (2006) 7483-7492 | 10.1088/0264-9381/23/24/019 | Freiburg THEP-06/06 | gr-qc astro-ph physics.space-ph | null | We give a rigorous derivation of the general-relativistic formula for the
two-way Doppler tracking of a spacecraft in Friedmann-Lemaitre-Robertson-Walker
and in McVittie spacetimes. The leading order corrections of the so-determined
acceleration to the Newtonian acceleration are due to special-relativistic
effects an... | [
{
"created": "Fri, 12 May 2006 19:45:38 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jul 2006 16:18:18 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Nov 2006 14:54:31 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Carrera",
"Matteo",
""
],
[
"Giulini",
"Domenico",
""
]
] | We give a rigorous derivation of the general-relativistic formula for the two-way Doppler tracking of a spacecraft in Friedmann-Lemaitre-Robertson-Walker and in McVittie spacetimes. The leading order corrections of the so-determined acceleration to the Newtonian acceleration are due to special-relativistic effects and ... |
1607.08610 | Juliano Neves | J. C. S. Neves | Bouncing cosmology inspired by regular black holes | 9 pages, 1 figure. Version 3 matches the published version in General
Relativity and Gravitation | Gen. Relativ. Gravit. 49, 124 (2017) | 10.1007/s10714-017-2288-6 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we present a bouncing cosmology inspired by a family of
regular black holes. This scale-dependent cosmology deviates from the
cosmological principle by means of a scale factor which depends on the time and
the radial coordinate as well. The model is isotropic but not perfectly
homogeneous. That is, t... | [
{
"created": "Thu, 28 Jul 2016 18:45:05 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2016 15:19:29 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Aug 2017 13:58:56 GMT",
"version": "v3"
}
] | 2017-08-30 | [
[
"Neves",
"J. C. S.",
""
]
] | In this article, we present a bouncing cosmology inspired by a family of regular black holes. This scale-dependent cosmology deviates from the cosmological principle by means of a scale factor which depends on the time and the radial coordinate as well. The model is isotropic but not perfectly homogeneous. That is, thi... |
gr-qc/0301012 | Wai-Mo Suen | J. L. Lu and W.-M. Suen | Extrinsic Curvature Embedding Diagrams | 22 pages, 4 figures | Gen.Rel.Grav. 35 (2003) 1175-1189 | 10.1023/A:1024441623121 | Wugrav-03-03 | gr-qc | null | Embedding diagrams have been used extensively to visualize the properties of
curved space in Relativity. We introduce a new kind of embedding diagram based
on the {\it extrinsic} curvature (instead of the intrinsic curvature). Such an
extrinsic curvature embedding diagram, when used together with the usual kind
of in... | [
{
"created": "Sun, 5 Jan 2003 15:22:28 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Lu",
"J. L.",
""
],
[
"Suen",
"W. -M.",
""
]
] | Embedding diagrams have been used extensively to visualize the properties of curved space in Relativity. We introduce a new kind of embedding diagram based on the {\it extrinsic} curvature (instead of the intrinsic curvature). Such an extrinsic curvature embedding diagram, when used together with the usual kind of intr... |
2312.02115 | Roberto A. Sussman | Roberto A Sussman and Sebastian Najera | Exact solutions of Cotton Gravity in its Codazzi formulation | Important updates and corrections, new references added, discussion
on criticism of the theory. Typos and minors errors corrected. 11 pages, one
figure | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The "Codazzi formulation", based on a Codazzi tensor, provides a more robust
and straightforward theoretical framework for "Cotton Gravity" (CG) than its
original formulation in terms of the Cotton tensor. Using this formulation we
provide a self-consistent procedure to generate non-trivial exact solutions in
CG that... | [
{
"created": "Mon, 4 Dec 2023 18:47:36 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2024 22:49:26 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Feb 2024 02:54:04 GMT",
"version": "v3"
}
] | 2024-02-05 | [
[
"Sussman",
"Roberto A",
""
],
[
"Najera",
"Sebastian",
""
]
] | The "Codazzi formulation", based on a Codazzi tensor, provides a more robust and straightforward theoretical framework for "Cotton Gravity" (CG) than its original formulation in terms of the Cotton tensor. Using this formulation we provide a self-consistent procedure to generate non-trivial exact solutions in CG that g... |
gr-qc/9507055 | I. Racz | Istvan Racz and Robert M. Wald | Global Extensions of Spacetimes Describing Asymptotic Final States of
Black Holes | 20 pages, plain tex | Class.Quant.Grav. 13 (1996) 539-553 | 10.1088/0264-9381/13/3/017 | null | gr-qc | null | We consider a globally hyperbolic, stationary spacetime containing a black
hole but no white hole. We assume, further, that the event horizon, $\tn$, of
the black hole is a Killing horizon with compact cross-sections. We prove that
if surface gravity is non-zero constant throughout the horizon one can {\it
globally} ... | [
{
"created": "Fri, 28 Jul 1995 14:58:15 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Racz",
"Istvan",
""
],
[
"Wald",
"Robert M.",
""
]
] | We consider a globally hyperbolic, stationary spacetime containing a black hole but no white hole. We assume, further, that the event horizon, $\tn$, of the black hole is a Killing horizon with compact cross-sections. We prove that if surface gravity is non-zero constant throughout the horizon one can {\it globally} ex... |
0904.0423 | Kirill Krasnov | Kirill Krasnov | Plebanski Formulation of General Relativity: A Practical Introduction | (v1) 13 pages, no figures (v2) 15 pages, published version | Gen.Rel.Grav.43:1-15,2011 | 10.1007/s10714-010-1061-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a pedagogical introduction into an old, but unfortunately not
commonly known formulation of GR in terms of self-dual two-forms due to in
particular Jerzy Plebanski. Our presentation is rather explicit in that we show
how the familiar textbook solutions: Schwarzschild, Volkoff-Oppenheimer, as
well as those des... | [
{
"created": "Thu, 2 Apr 2009 16:36:19 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2010 12:21:34 GMT",
"version": "v2"
}
] | 2011-03-04 | [
[
"Krasnov",
"Kirill",
""
]
] | We give a pedagogical introduction into an old, but unfortunately not commonly known formulation of GR in terms of self-dual two-forms due to in particular Jerzy Plebanski. Our presentation is rather explicit in that we show how the familiar textbook solutions: Schwarzschild, Volkoff-Oppenheimer, as well as those descr... |
gr-qc/0501045 | Robert Carroll | Robert Carroll | Fluctuations, gravity, and the quantum potential | 50 pages, Latex | null | null | null | gr-qc | null | We show how the quantum potential arises in various ways and trace its
connection to quantum fluctuations and Fisher information along with its
realization in terms of Weyl curvature. It is a quantization factor for certain
classical systems as well as an expression for quantum matter in gravity
theories of Weyl-Dira... | [
{
"created": "Thu, 13 Jan 2005 16:07:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carroll",
"Robert",
""
]
] | We show how the quantum potential arises in various ways and trace its connection to quantum fluctuations and Fisher information along with its realization in terms of Weyl curvature. It is a quantization factor for certain classical systems as well as an expression for quantum matter in gravity theories of Weyl-Dirac ... |
1202.1204 | Sergey Paston | S. A. Paston, A. A. Sheykin | Embeddings for Schwarzschild metric: classification and new results | LaTeX, 19 pages | Class. Quantum Grav. 29 (2012) 095022 | 10.1088/0264-9381/29/9/095022 | SPbU-IP-12-01 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a method to search the embeddings of Riemannian spaces with a high
enough symmetry in a flat ambient space. It is based on a procedure of
construction surfaces with a given symmetry. The method is used to classify the
embeddings of the Schwarzschild metric which have the symmetry of this
solution, and all ... | [
{
"created": "Mon, 6 Feb 2012 17:03:38 GMT",
"version": "v1"
}
] | 2012-04-23 | [
[
"Paston",
"S. A.",
""
],
[
"Sheykin",
"A. A.",
""
]
] | We suggest a method to search the embeddings of Riemannian spaces with a high enough symmetry in a flat ambient space. It is based on a procedure of construction surfaces with a given symmetry. The method is used to classify the embeddings of the Schwarzschild metric which have the symmetry of this solution, and all su... |
1310.1452 | Mohammad Reza Tanhayi | R. Vazirian, M. R. Tanhayi and Z. A. Motahar | Weyl-invariant extension of the Metric-Affine Gravity | 10 pages, no figure, references added, typos corrected and overall
improvement | Advances in High Energy Physics 2015, 902396, 7 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Metric-affine geometry provides a non-trivial extension of the general
relativity where the metric and connection are treated as the two independent
fundamental quantities in constructing the space-time (with non-vanishing
torsion and non-metricity). In this paper we study the generic form of action
in this formalism... | [
{
"created": "Sat, 5 Oct 2013 07:31:39 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Dec 2013 07:46:01 GMT",
"version": "v2"
}
] | 2015-01-23 | [
[
"Vazirian",
"R.",
""
],
[
"Tanhayi",
"M. R.",
""
],
[
"Motahar",
"Z. A.",
""
]
] | Metric-affine geometry provides a non-trivial extension of the general relativity where the metric and connection are treated as the two independent fundamental quantities in constructing the space-time (with non-vanishing torsion and non-metricity). In this paper we study the generic form of action in this formalism, ... |
2001.01363 | Xiang-Hua Zhai | Rui-Hui Lin, Rui Jiang, Yang Huang and Xiang-Hua Zhai | Probing the conformal invariance around the nonsingular static spherical
black holes with waves | 21 pages, 12 figures, title, abstract and some contents changed, an
appendix added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conformal invariance can ameliorate or eliminate the singularities residing
in the black holes, and may still exist in the strong gravity regimes close to
these black holes.
In this paper, we try to probe this conformal invariance by looking into the
wave absorption and scattering by the nonsingular static spherica... | [
{
"created": "Mon, 6 Jan 2020 02:23:26 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2020 05:55:01 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jan 2020 12:58:06 GMT",
"version": "v3"
},
{
"created": "Sun, 7 Jun 2020 03:30:50 GMT",
"version": "v4"
}
] | 2020-06-09 | [
[
"Lin",
"Rui-Hui",
""
],
[
"Jiang",
"Rui",
""
],
[
"Huang",
"Yang",
""
],
[
"Zhai",
"Xiang-Hua",
""
]
] | Conformal invariance can ameliorate or eliminate the singularities residing in the black holes, and may still exist in the strong gravity regimes close to these black holes. In this paper, we try to probe this conformal invariance by looking into the wave absorption and scattering by the nonsingular static spherical bl... |
0906.3947 | Jan Ambjorn | Jan Ambjorn, Jerzy Jurkiewicz and Renate Loll | Quantum gravity as sum over spacetimes | references added, typos corrected. 67 pages, lectures given at the
summer school "New Paths Towards Quantum Gravity", May 12-16 2008. To appear
as part of a Springer Lecture Notes in Physics publication: "Quantum Gravity
- New Paths Towards Unification" | Lect.Notes Phys.807:59-124,2010 | 10.1007/978-3-642-11897-5_2 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A major unsolved problem in theoretical physics is to reconcile the classical
theory of general relativity with quantum mechanics. These lectures will deal
with an attempt to describe quantum gravity as a path integral over geometries
known as "Causal Dynamical Triangulations" (CDT).
| [
{
"created": "Mon, 22 Jun 2009 08:55:27 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2009 21:30:42 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Ambjorn",
"Jan",
""
],
[
"Jurkiewicz",
"Jerzy",
""
],
[
"Loll",
"Renate",
""
]
] | A major unsolved problem in theoretical physics is to reconcile the classical theory of general relativity with quantum mechanics. These lectures will deal with an attempt to describe quantum gravity as a path integral over geometries known as "Causal Dynamical Triangulations" (CDT). |
1006.1586 | Sergio Zerbini | Guido Cognola, Lorenzo Sebastiani and Sergio Zerbini | Stability in Generalized Modified Gravity | 4 pages, Latex file, Proceeding MG12, Paris, added one reference | null | null | UTN2010-6 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stability issue of generalized modified gravitational models is discussed
with particular emphasis to de Sitter solutions. Two approaches are briefly
presented.
| [
{
"created": "Tue, 8 Jun 2010 15:27:36 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jun 2010 08:13:42 GMT",
"version": "v2"
}
] | 2010-06-10 | [
[
"Cognola",
"Guido",
""
],
[
"Sebastiani",
"Lorenzo",
""
],
[
"Zerbini",
"Sergio",
""
]
] | The stability issue of generalized modified gravitational models is discussed with particular emphasis to de Sitter solutions. Two approaches are briefly presented. |
1201.0080 | Hossein Farajollahi | Hossein Farajollahi, Amin Salehi, Mohammad Nasiri | Constraints on scalar-tensor theories from observations | 16 pages, 32 figures | Phys. Rev. D 84, 124045 (2011) | 10.1103/PhysRevD.84.124045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamical description of scalar-tensor gravity by performing the
best-fit analysis for two cases of exponential and power-law form of the
potential and scalar field function coupled to the curvature. The models are
then tested against observational data. The results show that in both scenarios
the Univer... | [
{
"created": "Fri, 30 Dec 2011 08:46:06 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Farajollahi",
"Hossein",
""
],
[
"Salehi",
"Amin",
""
],
[
"Nasiri",
"Mohammad",
""
]
] | We study the dynamical description of scalar-tensor gravity by performing the best-fit analysis for two cases of exponential and power-law form of the potential and scalar field function coupled to the curvature. The models are then tested against observational data. The results show that in both scenarios the Universe... |
gr-qc/9707011 | Yoonbai Kim | Nakwoo Kim, Yoonbai Kim and Kyoungtae Kimm | Charged Black Cosmic String | ll pages, LaTeX | Class.Quant.Grav.15:1513-1520,1998 | 10.1088/0264-9381/15/6/007 | SNUTP-97-022 | gr-qc hep-th | null | Global U(1) strings with cylindrical symmetry are studied in anti-de Sitter
spacetime. According as the magnitude of negative cosmological constant, they
form regular global cosmic strings, extremal black cosmic strings and charged
black cosmic strings, but no curvature singularity is involved. The
relationship betwe... | [
{
"created": "Fri, 4 Jul 1997 06:58:30 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kim",
"Nakwoo",
""
],
[
"Kim",
"Yoonbai",
""
],
[
"Kimm",
"Kyoungtae",
""
]
] | Global U(1) strings with cylindrical symmetry are studied in anti-de Sitter spacetime. According as the magnitude of negative cosmological constant, they form regular global cosmic strings, extremal black cosmic strings and charged black cosmic strings, but no curvature singularity is involved. The relationship between... |
1610.00448 | Nils Andersson | N. Andersson, I. Hawke, K. Dionysopoulou and G.L. Comer | Beyond ideal magnetohydrodynamics: From fibration to 3+1 foliation | 35 pages, no figures | null | 10.1088/1361-6382/aa6b39 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a resistive multi-fluid framework from the 3+1 space-time
foliation point-of-view, paying particular attention to issues relating to the
use of multi-parameter equations of state and the associated inversion from
evolved to primitive variables. We highlight relevant numerical issues that
arise for general... | [
{
"created": "Mon, 3 Oct 2016 08:57:49 GMT",
"version": "v1"
}
] | 2017-05-31 | [
[
"Andersson",
"N.",
""
],
[
"Hawke",
"I.",
""
],
[
"Dionysopoulou",
"K.",
""
],
[
"Comer",
"G. L.",
""
]
] | We consider a resistive multi-fluid framework from the 3+1 space-time foliation point-of-view, paying particular attention to issues relating to the use of multi-parameter equations of state and the associated inversion from evolved to primitive variables. We highlight relevant numerical issues that arise for general s... |
2211.03156 | Xiongjun Fang | Wentao Liu, Xiongjun Fang, Jiliang Jing, Jieci Wang | QNMs of slowly rotating Einstein-Bumblebee Black Hole | 16 pages, 6 figures | Eur. Phys. J. C 83:83 (2023) | 10.1140/epjc/s10052-023-11231-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the quasinormal modes (QNMs) of a slowly rotating black hole
with Lorentz-violating parameter in Einstein-bumblebee gravity. We analyse the
slow rotation approximation of the rotating black hole in the
Einstein-bumblebee gravity, and obtain the master equations for scalar
perturbation, vector perturba... | [
{
"created": "Sun, 6 Nov 2022 15:45:31 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2023 07:29:45 GMT",
"version": "v2"
}
] | 2023-01-31 | [
[
"Liu",
"Wentao",
""
],
[
"Fang",
"Xiongjun",
""
],
[
"Jing",
"Jiliang",
""
],
[
"Wang",
"Jieci",
""
]
] | We have studied the quasinormal modes (QNMs) of a slowly rotating black hole with Lorentz-violating parameter in Einstein-bumblebee gravity. We analyse the slow rotation approximation of the rotating black hole in the Einstein-bumblebee gravity, and obtain the master equations for scalar perturbation, vector perturbati... |
1709.09592 | Diego Rubiera-Garcia | C. Menchon, Gonzalo J. Olmo, D. Rubiera-Garcia | Nonsingular black holes, wormholes, and de Sitter cores from anisotropic
fluids | 15 double column pages; 7 figures | Phys. Rev. D 96, 104028 (2017) | 10.1103/PhysRevD.96.104028 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Born-Infeld gravity coupled to an anisotropic fluid in a static,
spherically symmetric background. The free function characterizing the fluid is
selected on the following grounds: i) recovery of the Reissner-Nordstr\"om
solution of GR at large distances, ii) fulfillment of classical energy
conditions and iii... | [
{
"created": "Wed, 27 Sep 2017 15:51:24 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Menchon",
"C.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | We study Born-Infeld gravity coupled to an anisotropic fluid in a static, spherically symmetric background. The free function characterizing the fluid is selected on the following grounds: i) recovery of the Reissner-Nordstr\"om solution of GR at large distances, ii) fulfillment of classical energy conditions and iii) ... |
gr-qc/9911065 | Dmitrij Fursaev | D.V. Fursaev | Black Hole Entropy in Induced Gravity and Information Loss | 4 pages, the talk given at 3d Meeting on Constrained Dynamics and
Quantum Gravity, Villasimius, Sardinia, Italy, 14-18 September, 1999 | Nucl.Phys.Proc.Suppl. 88 (2000) 277-280 | 10.1016/S0920-5632(00)00784-2 | null | gr-qc hep-th | null | The basic assumption of the induced gravity approach is that Einstein theory
is an effective, low energy-form of a quantum theory of constituents. In this
approach the Bekenstein-Hawking entropy S^{BH} of a black hole can be
interpreted as a measure of the loss of information about constituents inside
the black hole ... | [
{
"created": "Thu, 18 Nov 1999 10:26:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fursaev",
"D. V.",
""
]
] | The basic assumption of the induced gravity approach is that Einstein theory is an effective, low energy-form of a quantum theory of constituents. In this approach the Bekenstein-Hawking entropy S^{BH} of a black hole can be interpreted as a measure of the loss of information about constituents inside the black hole ho... |
1103.5190 | B. V. Ivanov | B.V.Ivanov | Self-gravitating spheres of anisotropic fluid in geodesic flow | 21 pages | Int.J.Mod.Phys.D 20 (2011) 319 | 10.1142/S0218271811018858 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fluid models mentioned in the title are classified. All characteristics
of the fluid are expressed through a master potential, satisfying an ordinary
second order differential equation. Different constraints are imposed on this
core of relations, finding new solutions and deriving the classical results for
perfec... | [
{
"created": "Sun, 27 Mar 2011 06:49:59 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Ivanov",
"B. V.",
""
]
] | The fluid models mentioned in the title are classified. All characteristics of the fluid are expressed through a master potential, satisfying an ordinary second order differential equation. Different constraints are imposed on this core of relations, finding new solutions and deriving the classical results for perfect ... |
1503.08709 | Dong-han Yeom | Pisin Chen, Taotao Qiu, Dong-han Yeom | Phantom of the Hartle-Hawking instanton: connecting inflation with dark
energy | 20 pages, 7 figures | Eur.Phys.J. C76 (2016) 91 | 10.1140/epjc/s10052-016-3932-0 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the Hartle-Hawking wave function is the correct boundary condition of our
universe, the history of our universe will be well approximated by an
instanton. Although this instanton should be classicalized at infinity, as long
as we are observing a process of each history, we may detect a
non-classicalized part of fi... | [
{
"created": "Mon, 30 Mar 2015 15:23:52 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Feb 2016 08:51:32 GMT",
"version": "v2"
}
] | 2016-02-23 | [
[
"Chen",
"Pisin",
""
],
[
"Qiu",
"Taotao",
""
],
[
"Yeom",
"Dong-han",
""
]
] | If the Hartle-Hawking wave function is the correct boundary condition of our universe, the history of our universe will be well approximated by an instanton. Although this instanton should be classicalized at infinity, as long as we are observing a process of each history, we may detect a non-classicalized part of fiel... |
gr-qc/9508046 | null | G. Sardanashvily | Fermions in Gravitation Theory | 10 pp LaTeX file. The report on the Workshop "New Frontiers of
Gravitation Theory" (Monteroduni, August 1995) | null | null | null | gr-qc | null | In gravitation theory, a fermion field must be regarded only in a pair with a
certain tetrad gravitational field. These pairs can be represented by sections
of the composite spinor bundle $S\to\Si\to X^4$ where values of gravitational
fields play the role of parameter coordinates, besides the familiar world
coordinat... | [
{
"created": "Mon, 21 Aug 1995 09:26:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sardanashvily",
"G.",
""
]
] | In gravitation theory, a fermion field must be regarded only in a pair with a certain tetrad gravitational field. These pairs can be represented by sections of the composite spinor bundle $S\to\Si\to X^4$ where values of gravitational fields play the role of parameter coordinates, besides the familiar world coordinates... |
1705.00297 | Jia-An Lu | Jia-An Lu | On the difference between Poincar\'e and Lorentz gravity | 11 pages | Gen. Relativ. Gravit. 49, 138 (2017) | 10.1007/s10714-017-2296-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Poincar\'e invariance of GR is usually interpreted as Lorentz invariance
plus diffeomorphism invariance. In this paper, by introducing the local
inertial coordinates (LIC), it is shown that a theory with Lorentz and
diffeomorphism invariance is not necessarily Poincar\'e invariant. Actually,
the energy-momentum c... | [
{
"created": "Sun, 30 Apr 2017 11:05:48 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Oct 2017 01:51:41 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Lu",
"Jia-An",
""
]
] | The Poincar\'e invariance of GR is usually interpreted as Lorentz invariance plus diffeomorphism invariance. In this paper, by introducing the local inertial coordinates (LIC), it is shown that a theory with Lorentz and diffeomorphism invariance is not necessarily Poincar\'e invariant. Actually, the energy-momentum con... |
2012.05068 | Milko Estrada | Milko Estrada and Francisco Tello-Ortiz | A new model of regular black hole in $(2+1)$ dimensions | accepted for publication in EPL | EPL 135 (2021) 2, 20001 | 10.1209/0295-5075/ac0ed0 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We provide a new regular black hole solution in $(2+1)$ dimensions with
presence of matter fields in the energy momentum tensor, having its core a flat
or (A)dS structure. Since the first law of thermodynamics for regular black
holes is modified by the presence of the matter fields, we provide a new
version of the fi... | [
{
"created": "Wed, 9 Dec 2020 14:20:17 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2021 17:09:32 GMT",
"version": "v2"
}
] | 2021-11-09 | [
[
"Estrada",
"Milko",
""
],
[
"Tello-Ortiz",
"Francisco",
""
]
] | We provide a new regular black hole solution in $(2+1)$ dimensions with presence of matter fields in the energy momentum tensor, having its core a flat or (A)dS structure. Since the first law of thermodynamics for regular black holes is modified by the presence of the matter fields, we provide a new version of the firs... |
0911.2139 | Mariafelicia De Laurentis | Mariafelicia De Laurentis, Salvatore Capozziello, Shin'ichi Nojiri,
Sergei Odintsov | PPN limit and cosmological gravitational waves as tools to constrain
f(R)-gravity | 4 pages, Grassmann Meeting 2009, Annalen der Physik | Annalen Phys.19:347-350,2010 | 10.1002/andp.201010444 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the PPN Solar-System constraints and the GW stochastic background
considering some recently proposed $f(R)$ gravity models which satisfy both
cosmological and stability conditions. Using the definition of PPN-parameters
$\gamma$ and $\beta$ in terms of $f(R)$-models and the definition of scalar
GWs, we com... | [
{
"created": "Wed, 11 Nov 2009 14:08:27 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei",
""
]
] | We discuss the PPN Solar-System constraints and the GW stochastic background considering some recently proposed $f(R)$ gravity models which satisfy both cosmological and stability conditions. Using the definition of PPN-parameters $\gamma$ and $\beta$ in terms of $f(R)$-models and the definition of scalar GWs, we compa... |
2401.13039 | Duarte Miguel Da Silva Feiteira | Duarte Feiteira, Jos\'e P. S. Lemos, Oleg B. Zaslavskii | Penrose process in Reissner-Nordstr\"om-AdS black hole spacetimes: Black
hole energy factories and black hole bombs | 20 pages, 1 figure | Phys. Rev. D 109, 064065 (2024) | 10.1103/PhysRevD.109.064065 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | The Penrose process for the decay of electrically charged particles in a
Reissner-Nordstr\"om-anti-de Sitter black hole spacetime is studied. To extract
large quantities of energy one needs to mount a recursive Penrose process where
particles are confined and can bounce back to suffer ever again a decaying
process in... | [
{
"created": "Tue, 23 Jan 2024 19:00:06 GMT",
"version": "v1"
}
] | 2024-03-27 | [
[
"Feiteira",
"Duarte",
""
],
[
"Lemos",
"José P. S.",
""
],
[
"Zaslavskii",
"Oleg B.",
""
]
] | The Penrose process for the decay of electrically charged particles in a Reissner-Nordstr\"om-anti-de Sitter black hole spacetime is studied. To extract large quantities of energy one needs to mount a recursive Penrose process where particles are confined and can bounce back to suffer ever again a decaying process in t... |
1208.6489 | Louis Gallouin | Louis Gallouin, Hiroyuki Nakano, Nicolas Yunes and Manuela Campanelli | Asymptotically Matched Spacetime Metric for Non-Precessing, Spinning
Black Hole Binaries | null | null | 10.1088/0264-9381/29/23/235013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a closed-form, fully analytical 4-metric that approximately
represents the spacetime evolution of non-precessing, spinning black hole
binaries from infinite separations up to a few orbits prior to merger. We
employ the technique of asymptotic matching to join a perturbed Kerr metric in
the neighborhood o... | [
{
"created": "Fri, 31 Aug 2012 13:20:04 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Gallouin",
"Louis",
""
],
[
"Nakano",
"Hiroyuki",
""
],
[
"Yunes",
"Nicolas",
""
],
[
"Campanelli",
"Manuela",
""
]
] | We construct a closed-form, fully analytical 4-metric that approximately represents the spacetime evolution of non-precessing, spinning black hole binaries from infinite separations up to a few orbits prior to merger. We employ the technique of asymptotic matching to join a perturbed Kerr metric in the neighborhood of ... |
0708.3729 | Alessandro Pesci | Alessandro Pesci | From Unruh temperature to generalized Bousso bound | 5 pages. v2: some changes to clarify the path to the obtained
results; two (final) paragraphs, the acknowledgments and a reference added | Class.Quant.Grav.24:6219-6226,2007 | 10.1088/0264-9381/24/24/005 | null | gr-qc | null | In a classical spacetime satisfying Einstein's equation and the null
convergence condition, the same quantum mechanical effects that cause black
holes to have a temperature are found to imply, if joined to the macroscopic
nature of entropy, the covariant entropy bound in its generalized form. This is
obtained from th... | [
{
"created": "Tue, 28 Aug 2007 09:45:37 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2007 11:20:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Pesci",
"Alessandro",
""
]
] | In a classical spacetime satisfying Einstein's equation and the null convergence condition, the same quantum mechanical effects that cause black holes to have a temperature are found to imply, if joined to the macroscopic nature of entropy, the covariant entropy bound in its generalized form. This is obtained from ther... |
gr-qc/0701028 | Jiri Kovar | Jiri Kovar, Zdenek Stuchlik | Optical reference geometry and inertial forces in Kerr-de Sitter
spacetimes | 31 pages, 10 figures | Class.Quant.Grav.24:565-594,2007 | 10.1088/0264-9381/24/3/004 | null | gr-qc | null | Optical reference geometry and related concept of inertial forces are
investigated in Kerr-de Sitter spacetimes. Properties of the inertial forces
are summarized and their typical behaviour is illustrated. The intuitive
'Newtonian' application of the forces in the relativistic dynamics is
demonstrated in the case of ... | [
{
"created": "Wed, 3 Jan 2007 16:58:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kovar",
"Jiri",
""
],
[
"Stuchlik",
"Zdenek",
""
]
] | Optical reference geometry and related concept of inertial forces are investigated in Kerr-de Sitter spacetimes. Properties of the inertial forces are summarized and their typical behaviour is illustrated. The intuitive 'Newtonian' application of the forces in the relativistic dynamics is demonstrated in the case of th... |
1602.03622 | Steven B. Giddings | Steven B. Giddings | Gravitational wave tests of quantum modifications to black hole
structure -- with post-GW150914 update | v2: Major revision: incorporating discussion of data from GW150914
and priorities for future work. v3: Added comments re. constraints from
current LIGO data, and directions for improving constraints. Version to
appear in Classical and Quantum Gravity | Classical and Quantum Gravity, 33 (2016) 235010 | 10.1088/0264-9381/33/23/235010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A preliminary discussion is given of the prospects that gravitational-wave
observations of binary inspiral of black holes could reveal or constrain
quantum modifications to black hole dynamics, such as are required to preserve
postulates of quantum mechanics. Different proposals for such modifications are
characteriz... | [
{
"created": "Thu, 11 Feb 2016 06:03:13 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2016 21:24:36 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Nov 2016 23:46:35 GMT",
"version": "v3"
}
] | 2016-11-08 | [
[
"Giddings",
"Steven B.",
""
]
] | A preliminary discussion is given of the prospects that gravitational-wave observations of binary inspiral of black holes could reveal or constrain quantum modifications to black hole dynamics, such as are required to preserve postulates of quantum mechanics. Different proposals for such modifications are characterized... |
2403.18289 | Abolhassan Mohammadi | Abolhassan Mohammadi | Exploring the pre-inflationary dynamics in loop quantum cosmology with a
DBI scalar field | 11 pages, 7 figures, 1 table, submitted version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop quantum cosmology is a symmetry-reduced application of loop quantum
gravity. The theory predicts a bounce for the universe at the Planck scale and
resolves the singularity of standard cosmology. The dynamics is also governed
by an effective Hamiltonian, which predicts a modified Friedmann equation
containing the... | [
{
"created": "Wed, 27 Mar 2024 06:27:25 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2024 05:49:28 GMT",
"version": "v2"
}
] | 2024-06-27 | [
[
"Mohammadi",
"Abolhassan",
""
]
] | Loop quantum cosmology is a symmetry-reduced application of loop quantum gravity. The theory predicts a bounce for the universe at the Planck scale and resolves the singularity of standard cosmology. The dynamics is also governed by an effective Hamiltonian, which predicts a modified Friedmann equation containing the q... |
gr-qc/9903038 | S. R. Lau | S. R. Lau (UNC Chapel Hill) | Lightcone reference for total gravitational energy | latex, 7 pages, no figures. Uses an amstex symbol | Phys.Rev. D60 (1999) 104034 | 10.1103/PhysRevD.60.104034 | TAR-067-UNC | gr-qc | null | We give an explicit expression for gravitational energy, written solely in
terms of physical spacetime geometry, which in suitable limits agrees with the
total Arnowitt-Deser-Misner and Trautman-Bondi-Sachs energies for
asymptotically flat spacetimes and with the Abbot-Deser energy for
asymptotically anti-de Sitter s... | [
{
"created": "Wed, 10 Mar 1999 21:03:39 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lau",
"S. R.",
"",
"UNC Chapel Hill"
]
] | We give an explicit expression for gravitational energy, written solely in terms of physical spacetime geometry, which in suitable limits agrees with the total Arnowitt-Deser-Misner and Trautman-Bondi-Sachs energies for asymptotically flat spacetimes and with the Abbot-Deser energy for asymptotically anti-de Sitter spa... |
1106.0102 | Hao Wei | Hao Wei, Xiao-Peng Ma, Hao-Yu Qi | $f(T)$ Theories and Varying Fine Structure Constant | 12 pages, 4 figures, 1 table, revtex4; v2: discussions added, Phys.
Lett. B in press; v3: published version | Phys.Lett.B703:74-80,2011 | 10.1016/j.physletb.2011.07.042 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In analogy to $f(R)$ theory, recently a new modified gravity theory, namely
the so-called $f(T)$ theory, has been proposed to drive the current accelerated
expansion without invoking dark energy. In the present work, by extending
Bisabr's idea, we try to constrain $f(T)$ theories with the varying fine
structure "cons... | [
{
"created": "Wed, 1 Jun 2011 06:41:00 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2011 06:41:00 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Aug 2011 09:00:00 GMT",
"version": "v3"
}
] | 2011-08-25 | [
[
"Wei",
"Hao",
""
],
[
"Ma",
"Xiao-Peng",
""
],
[
"Qi",
"Hao-Yu",
""
]
] | In analogy to $f(R)$ theory, recently a new modified gravity theory, namely the so-called $f(T)$ theory, has been proposed to drive the current accelerated expansion without invoking dark energy. In the present work, by extending Bisabr's idea, we try to constrain $f(T)$ theories with the varying fine structure "consta... |
1805.10442 | Thomas W. Baumgarte | Juliana Celestino and Thomas W. Baumgarte | Critical collapse of ultra-relativistic fluids: damping or growth of
aspherical deformations | 11 pages, 8 figures; see also
http://www.bowdoin.edu/~tbaumgar/rad_fluid_movie.mp4 for an animation | Phys. Rev. D 98, 024053 (2018) | 10.1103/PhysRevD.98.024053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform fully nonlinear numerical simulations to study aspherical
deformations of the critical self-similar solution in the gravitational
collapse of ultra-relativistic fluids. Adopting a perturbative calculation,
Gundlach predicted that these perturbations behave like damped or growing
oscillations, with the freq... | [
{
"created": "Sat, 26 May 2018 07:57:41 GMT",
"version": "v1"
}
] | 2018-08-08 | [
[
"Celestino",
"Juliana",
""
],
[
"Baumgarte",
"Thomas W.",
""
]
] | We perform fully nonlinear numerical simulations to study aspherical deformations of the critical self-similar solution in the gravitational collapse of ultra-relativistic fluids. Adopting a perturbative calculation, Gundlach predicted that these perturbations behave like damped or growing oscillations, with the freque... |
1909.10003 | Abhik Kumar Sanyal Dr. | Manas Chakrabortty, Nayem Sk and Abhik Kumar Sanyal | Some aspects of modified theory of gravity in Palatini formalism
unveiled | 12 pages, 0 figures | null | 10.1142/S021773232050162X | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under conformal transformation, f(R) theory of gravity in Palatini formalism
leads to a Brans-Dicke type of scalar-tensor equivalent theory with a wrong
sign in the effective kinetic energy term. This means, the effective scalar
acts as the dark energy and so late-time cosmic acceleration in
matter-dominated era is a... | [
{
"created": "Sun, 22 Sep 2019 13:27:16 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Chakrabortty",
"Manas",
""
],
[
"Sk",
"Nayem",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | Under conformal transformation, f(R) theory of gravity in Palatini formalism leads to a Brans-Dicke type of scalar-tensor equivalent theory with a wrong sign in the effective kinetic energy term. This means, the effective scalar acts as the dark energy and so late-time cosmic acceleration in matter-dominated era is acc... |
2109.11743 | Viktor T. Toth | Viktor T. Toth and Slava G. Turyshev | Efficient trace-free decomposition of symmetric tensors of arbitrary
rank | 14 pages, no figures | Int. J. Geom. Meth. Mod. Phys. 19 (13), 2250201 (2022) | 10.1142/S0219887822502012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Symmetric trace-free tensors are used in many areas of physics, including
electromagnetism, relativistic celestial mechanics and geodesy, as well as in
the study of gravitational radiation and gravitational lensing. Their use
allows integration of the relevant wave propagation equations to arbitrary
order. We present... | [
{
"created": "Fri, 24 Sep 2021 04:29:41 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2022 23:03:29 GMT",
"version": "v2"
}
] | 2022-11-29 | [
[
"Toth",
"Viktor T.",
""
],
[
"Turyshev",
"Slava G.",
""
]
] | Symmetric trace-free tensors are used in many areas of physics, including electromagnetism, relativistic celestial mechanics and geodesy, as well as in the study of gravitational radiation and gravitational lensing. Their use allows integration of the relevant wave propagation equations to arbitrary order. We present a... |
1604.07742 | Hector O. Silva | Masato Minamitsuji, Hector O. Silva | Relativistic stars in scalar-tensor theories with disformal coupling | 23 pages, 7 figures. v2: Improved discussion in the Conclusions.
Matches version published in PRD | Phys. Rev. D 93, 124041 (2016) | 10.1103/PhysRevD.93.124041 | null | gr-qc astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general formulation to analyze the structure of slowly rotating
relativistic stars in a broad class of scalar-tensor theories with disformal
coupling to matter. Our approach includes theories with generalized kinetic
terms, generic scalar field potentials and contains theories with conformal
coupling as ... | [
{
"created": "Tue, 26 Apr 2016 16:25:49 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2016 11:56:23 GMT",
"version": "v2"
}
] | 2016-06-22 | [
[
"Minamitsuji",
"Masato",
""
],
[
"Silva",
"Hector O.",
""
]
] | We present a general formulation to analyze the structure of slowly rotating relativistic stars in a broad class of scalar-tensor theories with disformal coupling to matter. Our approach includes theories with generalized kinetic terms, generic scalar field potentials and contains theories with conformal coupling as pa... |
1907.09221 | Jibitesh Dutta | Wompherdeiki Khyllep and Jibitesh Dutta | Linear growth index of matter perturbations in Rastall gravity | 8 pages, 4 figures. Accepted in Physics Letters B. Comments Welcome | null | 10.1016/j.physletb.2019.134796 | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | Rastall gravity theory shows notable features consistent with physical
observations in comparison to the standard Einstein theory. Recently, there has
been a debate about the equivalence of Rastall gravity and general relativity.
Motivated by this open issue, in the present work, we attempt to shed some
light on this... | [
{
"created": "Mon, 22 Jul 2019 10:31:38 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Dutta",
"Jibitesh",
""
]
] | Rastall gravity theory shows notable features consistent with physical observations in comparison to the standard Einstein theory. Recently, there has been a debate about the equivalence of Rastall gravity and general relativity. Motivated by this open issue, in the present work, we attempt to shed some light on this d... |
gr-qc/9805080 | Alberto Saa | Alberto Saa and Marcelo Schiffer | The gravitational Vavilov-Cherenkov effect | 9 pages, Honorable Mention from the Gravity Research Foundation, 1998 | Mod.Phys.Lett. A13 (1998) 1557 | 10.1142/S0217732398001637 | null | gr-qc | null | In this essay we show that an uncharged black-hole moving superluminally in a
transparent dielectric medium violates Hawking's area theorem. The violation is
overcome through the emission of radiation. Since modes cannot emerge from the
black hole itself, this radiation must originate from a collective effect in
the ... | [
{
"created": "Wed, 20 May 1998 18:28:11 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Saa",
"Alberto",
""
],
[
"Schiffer",
"Marcelo",
""
]
] | In this essay we show that an uncharged black-hole moving superluminally in a transparent dielectric medium violates Hawking's area theorem. The violation is overcome through the emission of radiation. Since modes cannot emerge from the black hole itself, this radiation must originate from a collective effect in the me... |
1406.3536 | Marco Sampaio | Marco O. P. Sampaio, Carlos Herdeiro, Mengjie Wang | Marginal scalar and Proca clouds around Reissner-Nordstr\"om black holes | 12 pages, 5 figures, 2 tables | Phys. Rev. D 90, 064004 (2014) | 10.1103/PhysRevD.90.064004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Massive scalar test fields around Kerr black holes can form quasi-bound
states with complex frequencies. Some of these states decay in time, but some
others -- in the superradiant regime -- grow, causing a superradiant
instability. Precisely at the threshold between decaying and growing modes,
there exist bound state... | [
{
"created": "Fri, 13 Jun 2014 13:56:37 GMT",
"version": "v1"
}
] | 2014-09-10 | [
[
"Sampaio",
"Marco O. P.",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Wang",
"Mengjie",
""
]
] | Massive scalar test fields around Kerr black holes can form quasi-bound states with complex frequencies. Some of these states decay in time, but some others -- in the superradiant regime -- grow, causing a superradiant instability. Precisely at the threshold between decaying and growing modes, there exist bound states ... |
1806.03996 | Ahmad Sheykhi | Ahmad Sheykhi | Modified Friedmann Equations from Tsallis Entropy | 11 pages, two columns. A new section regarding the cosmological
consequences of this model was added. Also text was revised and new
references added | null | 10.1016/j.physletb.2018.08.036 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | It was shown by Tsallis and Cirto that thermodynamical entropy of a
gravitational system such as black hole must be generalized to the non-additive
entropy, which is given by $S_h=\gamma A^{\beta}$, where $A$ is the horizon
area and $\beta$ is the nonextensive parameter \cite{Tsa}. In this paper, by
taking the entrop... | [
{
"created": "Thu, 7 Jun 2018 23:30:49 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2018 17:25:00 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Aug 2018 07:29:52 GMT",
"version": "v3"
}
] | 2018-09-26 | [
[
"Sheykhi",
"Ahmad",
""
]
] | It was shown by Tsallis and Cirto that thermodynamical entropy of a gravitational system such as black hole must be generalized to the non-additive entropy, which is given by $S_h=\gamma A^{\beta}$, where $A$ is the horizon area and $\beta$ is the nonextensive parameter \cite{Tsa}. In this paper, by taking the entropy ... |
1603.05714 | Kento Osuga | Kento Osuga, Don N. Page | A New Way to Derive the Taub-NUT Metric with Positive Cosmological
Constant | null | null | 10.1063/1.4999998 | Alberta-Thy-02-16 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a biaxial Bianchi IX model with positive cosmological
constant, which is sometimes called the Lambda-Taub-NUT spacetime, whose exact
solution is well known. The minisuperspace of biaxial Bianchi IX models admits
two non-trivial Killing tensors that play an important role for deriving the
Taub-NUT metri... | [
{
"created": "Thu, 17 Mar 2016 22:27:35 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Osuga",
"Kento",
""
],
[
"Page",
"Don N.",
""
]
] | We investigate a biaxial Bianchi IX model with positive cosmological constant, which is sometimes called the Lambda-Taub-NUT spacetime, whose exact solution is well known. The minisuperspace of biaxial Bianchi IX models admits two non-trivial Killing tensors that play an important role for deriving the Taub-NUT metric.... |
1509.03422 | Bibhas Majhi Ranjan | Bibhas Ranjan Majhi | Tolman temperature once again: A derivation from gravitational surface
action | 8 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The temperature distribution in presence of gravity, as measured by a local
observer, is given by the Tolman expression. Here I derive the same only from
the Gibbon's-Hawking-York surface term. In this process no explicit use of
Einstein's equations of motion is done. Therefore, the present one is an
off-shell analys... | [
{
"created": "Fri, 11 Sep 2015 09:00:34 GMT",
"version": "v1"
}
] | 2015-09-14 | [
[
"Majhi",
"Bibhas Ranjan",
""
]
] | The temperature distribution in presence of gravity, as measured by a local observer, is given by the Tolman expression. Here I derive the same only from the Gibbon's-Hawking-York surface term. In this process no explicit use of Einstein's equations of motion is done. Therefore, the present one is an off-shell analysis... |
1011.2062 | Stanislav Babak | Stanislav Babak, Jonathan R. Gair, Antoine Petiteau, Alberto Sesana | Fundamental physics and cosmology with LISA | Based on the talk given at GR19. 10 pages, 2 figures. Revised
version, accepted in CQG | Class.Quant.Grav.28:114001,2011 | 10.1088/0264-9381/28/11/114001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we give a brief review of the fundamental physics that can be
done with the future space-based gravitational wave detector LISA. This
includes detection of gravitational wave bursts coming from cosmic strings,
measuring a stochastic gravitational wave background, mapping spacetime around
massive compa... | [
{
"created": "Tue, 9 Nov 2010 12:42:50 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2011 09:59:44 GMT",
"version": "v2"
}
] | 2011-05-25 | [
[
"Babak",
"Stanislav",
""
],
[
"Gair",
"Jonathan R.",
""
],
[
"Petiteau",
"Antoine",
""
],
[
"Sesana",
"Alberto",
""
]
] | In this article we give a brief review of the fundamental physics that can be done with the future space-based gravitational wave detector LISA. This includes detection of gravitational wave bursts coming from cosmic strings, measuring a stochastic gravitational wave background, mapping spacetime around massive compact... |
1104.2938 | Curt Cutler | Curt Cutler | An improved, "phase-relaxed" F-statistic for gravitational-wave data
analysis | 8 pages, 4 figures, submitted to PRD | null | 10.1103/PhysRevD.86.063012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rapidly rotating, slightly non-axisymmetric neutron stars emit nearly
periodic gravitational waves (GWs), quite possibly at levels detectable by
ground-based GW interferometers. We refer to these sources as "GW pulsars". For
any given sky position and frequency evolution, the F-statistic is the optimal
(frequentist) ... | [
{
"created": "Thu, 14 Apr 2011 22:27:44 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Cutler",
"Curt",
""
]
] | Rapidly rotating, slightly non-axisymmetric neutron stars emit nearly periodic gravitational waves (GWs), quite possibly at levels detectable by ground-based GW interferometers. We refer to these sources as "GW pulsars". For any given sky position and frequency evolution, the F-statistic is the optimal (frequentist) st... |
1903.09204 | Daniel Williams | Daniel Williams, Ik Siong Heng, Jonathan Gair, James A Clark, Bhavesh
Khamesra | A Precessing Numerical Relativity Waveform Surrogate Model for Binary
Black Holes: A Gaussian Process Regression Approach | 13 pages, with 7 figures. Accepted by Physical Review D | Phys. Rev. D 101, 063011 (2020) | 10.1103/PhysRevD.101.063011 | null | gr-qc physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave astrophysics relies heavily on the use of matched
filtering both to detect signals in noisy data from detectors, and to perform
parameter estimation on those signals. Matched filtering relies upon prior
knowledge of the signals expected to be produced by a range of astrophysical
systems, such as bi... | [
{
"created": "Thu, 21 Mar 2019 19:08:13 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2019 14:44:31 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Feb 2020 16:01:16 GMT",
"version": "v3"
}
] | 2020-03-18 | [
[
"Williams",
"Daniel",
""
],
[
"Heng",
"Ik Siong",
""
],
[
"Gair",
"Jonathan",
""
],
[
"Clark",
"James A",
""
],
[
"Khamesra",
"Bhavesh",
""
]
] | Gravitational wave astrophysics relies heavily on the use of matched filtering both to detect signals in noisy data from detectors, and to perform parameter estimation on those signals. Matched filtering relies upon prior knowledge of the signals expected to be produced by a range of astrophysical systems, such as bina... |
1603.03429 | Omar Roldan | Omar Roldan, C.C. Barros Jr | Geometrical Aspects of non-gravitational interactions | 17 pages | null | null | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we look for a geometric description of non-gravitational forces.
The basic ideas are proposed studying the interaction between a punctual
particle and an electromagnetic external field. For this purpose, we introduce
the concept of proper space-time, that allow us to describe this interaction in
a way an... | [
{
"created": "Thu, 10 Mar 2016 20:36:34 GMT",
"version": "v1"
}
] | 2016-03-14 | [
[
"Roldan",
"Omar",
""
],
[
"Barros",
"C. C.",
"Jr"
]
] | In this work we look for a geometric description of non-gravitational forces. The basic ideas are proposed studying the interaction between a punctual particle and an electromagnetic external field. For this purpose, we introduce the concept of proper space-time, that allow us to describe this interaction in a way anal... |
1208.0736 | Yi Xie | Yi Xie | Testing Lorentz violation with binary pulsars: constraints on standard
model extension | 4 pages, no figure, accepted for publication in RAA | Research in Astronomy and Astrophysics, Volume 13, Issue 1, pp.
1-4 (2013) | 10.1088/1674-4527/13/1/001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under the standard model extension (SME) framework, Lorentz invariance is
tested in five binary pulsars: PSR J0737-3039, PSR B1534+12, PSR J1756-2251,
PSR B1913+16 and PSR B2127+11C. By analyzing the advance of periastron, we
obtain the constraints on a dimensionless combination of SME parameters that is
sensitive to... | [
{
"created": "Fri, 3 Aug 2012 13:21:53 GMT",
"version": "v1"
}
] | 2013-03-05 | [
[
"Xie",
"Yi",
""
]
] | Under the standard model extension (SME) framework, Lorentz invariance is tested in five binary pulsars: PSR J0737-3039, PSR B1534+12, PSR J1756-2251, PSR B1913+16 and PSR B2127+11C. By analyzing the advance of periastron, we obtain the constraints on a dimensionless combination of SME parameters that is sensitive to t... |
1606.04996 | Andrea Maselli | Andrea Maselli, Stefania Marassi, Valeria Ferrari, Kostas Kokkotas and
Raffaella Schneider | Constraining modified theories of gravity with gravitational wave
stochastic background | Results updated to match the version accepted on Phys. Rev. Lett | Phys. Rev. Lett. 117, 091102 (2016) | 10.1103/PhysRevLett.117.091102 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The direct discovery of gravitational waves has finally opened a new
observational window on our Universe, suggesting that the population of
coalescing binary black holes is larger than previously expected. These sources
produce an unresolved background of gravitational waves, potentially
observables by ground-based ... | [
{
"created": "Wed, 15 Jun 2016 22:34:04 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2016 07:40:47 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Maselli",
"Andrea",
""
],
[
"Marassi",
"Stefania",
""
],
[
"Ferrari",
"Valeria",
""
],
[
"Kokkotas",
"Kostas",
""
],
[
"Schneider",
"Raffaella",
""
]
] | The direct discovery of gravitational waves has finally opened a new observational window on our Universe, suggesting that the population of coalescing binary black holes is larger than previously expected. These sources produce an unresolved background of gravitational waves, potentially observables by ground-based in... |
gr-qc/9712034 | Hans-Juergen Schmidt | H.-J. Schmidt | A two-dimensional representation of four-dimensional gravitational waves | 12 pages, LaTeX, no figures, Int. J. Mod. Phys. D in print | Int.J.Mod.Phys. D7 (1998) 215-224 | 10.1142/S0218271898000176 | Preprint UNIPO-MATH-97-December-5 | gr-qc | null | The Einstein equation in D dimensions, if restricted to the class of
space-times possessing n = D - 2 commuting hypersurface-orthogonal Killing
vectors, can be equivalently written as metric-dilaton gravity in 2 dimensions
with n scalar fields. For n = 2, this results reduces to the known reduction of
certain 4-dimen... | [
{
"created": "Sat, 6 Dec 1997 12:35:26 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Schmidt",
"H. -J.",
""
]
] | The Einstein equation in D dimensions, if restricted to the class of space-times possessing n = D - 2 commuting hypersurface-orthogonal Killing vectors, can be equivalently written as metric-dilaton gravity in 2 dimensions with n scalar fields. For n = 2, this results reduces to the known reduction of certain 4-dimensi... |
1910.14035 | Vicharit Yingcharoenrat | Paolo Creminelli, Giovanni Tambalo, Filippo Vernizzi, and Vicharit
Yingcharoenrat | Dark-Energy Instabilities induced by Gravitational Waves | 26 pages, 4 figures. Matches JCAP version | null | 10.1088/1475-7516/2020/05/002 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that dark-energy perturbations may become unstable in the
presence of a gravitational wave of sufficiently large amplitude. We study this
effect for the cubic Horndeski operator (braiding), proportional to
$\alpha_{\rm B}$. The scalar that describes dark-energy fluctuations features
ghost and/or gradient... | [
{
"created": "Wed, 30 Oct 2019 17:55:21 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 2020 15:03:54 GMT",
"version": "v2"
}
] | 2020-05-05 | [
[
"Creminelli",
"Paolo",
""
],
[
"Tambalo",
"Giovanni",
""
],
[
"Vernizzi",
"Filippo",
""
],
[
"Yingcharoenrat",
"Vicharit",
""
]
] | We point out that dark-energy perturbations may become unstable in the presence of a gravitational wave of sufficiently large amplitude. We study this effect for the cubic Horndeski operator (braiding), proportional to $\alpha_{\rm B}$. The scalar that describes dark-energy fluctuations features ghost and/or gradient i... |
gr-qc/0511005 | Donald Neville | Donald E. Neville (Temple University) | The volume operator for spin networks with planar or cylindrical
symmetry | 35 pages | Phys.Rev.D73:124004,2006; Erratum-ibid.D77:129901,2008 | 10.1103/PhysRevD.73.124004 10.1103/PhysRevD.77.129901 | null | gr-qc | null | This paper constructs a kinematic basis for spin networks with planar or
cylindrical symmetry, by exploiting the fact that the basis elements are
representations of an O(3) subgroup of O(4). The action of the volume operator
on this basis gives a difference equation for the eigenvalues and eigenvectors
of the volume ... | [
{
"created": "Tue, 1 Nov 2005 20:09:20 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2006 15:41:18 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Neville",
"Donald E.",
"",
"Temple University"
]
] | This paper constructs a kinematic basis for spin networks with planar or cylindrical symmetry, by exploiting the fact that the basis elements are representations of an O(3) subgroup of O(4). The action of the volume operator on this basis gives a difference equation for the eigenvalues and eigenvectors of the volume op... |
gr-qc/0110126 | Marcello Ortaggio | Marcello Ortaggio (Universita' degli Studi di Trento and INFN) | Impulsive waves in the Nariai universe | 9 pages, 4 figures, REVTeX 4. v3: added Appendix B, revised
references, minor changes in the text. To appear in Phys. Rev. D | Phys.Rev. D65 (2002) 084046 | 10.1103/PhysRevD.65.084046 | null | gr-qc hep-th | null | A new class of exact solutions is presented which describes impulsive waves
propagating in the Nariai universe. It is constructed using a six-dimensional
embedding formalism adapted to the background. Due to the topology of the
latter, the wave front consists of two non-expanding spheres. Special
sub-classes represen... | [
{
"created": "Wed, 31 Oct 2001 17:48:58 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Oct 2001 22:10:04 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Feb 2002 10:58:11 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Ortaggio",
"Marcello",
"",
"Universita' degli Studi di Trento and INFN"
]
] | A new class of exact solutions is presented which describes impulsive waves propagating in the Nariai universe. It is constructed using a six-dimensional embedding formalism adapted to the background. Due to the topology of the latter, the wave front consists of two non-expanding spheres. Special sub-classes representi... |
1802.07660 | Sourav Bhattacharya | Sourav Bhattacharya, Stefanos R Kousvos, Stylianos Romanopoulos and
Theodore N Tomaras | Cosmological screening and the phantom braneworld model | v2, 14pp, 3 figs; mistake in the +- sign in the spatially homogeneous
eqn in v1 corrected; consequently, the conclusions of the current version
differ from those of v1 | Eur. Phys. J. C (2018) 78 : 637 | 10.1140/epjc/s10052-018-6119-z | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scalar and vector cosmological perturbations at all length scales of our
Universe are studied in the framework of the phantom braneworld model. The
model is characterized by the parameter $\Omega_M\equiv M^3/2m^2H_0$, with $M$
and $m$ the 5- and 4-dimensional Planck scales, respectively, and $H_0$ the
Hubble para... | [
{
"created": "Wed, 21 Feb 2018 16:47:26 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2018 05:25:34 GMT",
"version": "v2"
}
] | 2018-08-14 | [
[
"Bhattacharya",
"Sourav",
""
],
[
"Kousvos",
"Stefanos R",
""
],
[
"Romanopoulos",
"Stylianos",
""
],
[
"Tomaras",
"Theodore N",
""
]
] | The scalar and vector cosmological perturbations at all length scales of our Universe are studied in the framework of the phantom braneworld model. The model is characterized by the parameter $\Omega_M\equiv M^3/2m^2H_0$, with $M$ and $m$ the 5- and 4-dimensional Planck scales, respectively, and $H_0$ the Hubble parame... |
1410.4411 | Astrid Eichhorn | P. Don\`a, Astrid Eichhorn, Roberto Percacci | Consistency of matter models with asymptotically safe quantum gravity | prepared for the proceedings of Theory Canada 9; new results on the
gravitino, 8 pages, 1 figure, 1 table | null | 10.1139/cjp-2014-0574 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the compatibility of quantum gravity with dynamical matter degrees
of freedom. Specifically, we present bounds we obtained in [1] on the allowed
number and type of matter fields within asymptotically safe quantum gravity. As
a novel result, we show bounds on the allowed number of spin-3/2
(Rarita-Schwinger... | [
{
"created": "Thu, 16 Oct 2014 13:21:14 GMT",
"version": "v1"
}
] | 2023-07-19 | [
[
"Donà",
"P.",
""
],
[
"Eichhorn",
"Astrid",
""
],
[
"Percacci",
"Roberto",
""
]
] | We discuss the compatibility of quantum gravity with dynamical matter degrees of freedom. Specifically, we present bounds we obtained in [1] on the allowed number and type of matter fields within asymptotically safe quantum gravity. As a novel result, we show bounds on the allowed number of spin-3/2 (Rarita-Schwinger) ... |
1412.3977 | Dijana Tolic | Neven Bilic, Dijana Tolic | Cosmological particle creation in a hadronic fluid | 13 pages, 4 figures, revised to match the version published in Phys.
Rev. D., section IIB rewritten, section IIIC expanded, discussion on
adiabaticity expanded and clarified, three references added, results
unchanged | Phys. Rev. D 91, 104025 (2015) | 10.1103/PhysRevD.91.104025 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Acoustic perturbations in an expanding hadronic fluid at temperatures below
the chiral transition point represent massless pions propagating in curved
spacetime geometry. In comoving coordinates the corresponding analog metric
tensor describes a hyperbolic FRW spacetime. We study the analog cosmological
particle crea... | [
{
"created": "Fri, 12 Dec 2014 12:52:07 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jan 2015 16:46:16 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jun 2015 07:32:35 GMT",
"version": "v3"
}
] | 2015-06-12 | [
[
"Bilic",
"Neven",
""
],
[
"Tolic",
"Dijana",
""
]
] | Acoustic perturbations in an expanding hadronic fluid at temperatures below the chiral transition point represent massless pions propagating in curved spacetime geometry. In comoving coordinates the corresponding analog metric tensor describes a hyperbolic FRW spacetime. We study the analog cosmological particle creati... |
1607.03702 | Jie-Xiong Mo | Jie-Xiong Mo | An alternative perspective to observe the critical phenomena of dilaton
AdS black holes | Comments welcome. 19 pages, 10 figures, 8 tables | null | 10.1140/epjc/s10052-017-5103-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The critical phenomena of dilaton AdS black holes are probed from a totally
different perspective other than the $P-v$ criticality and the $q-U$
criticality discussed in the former literature. We investigate not only the two
point correlation function but also the entanglement entropy of dilaton AdS
black holes. We a... | [
{
"created": "Wed, 13 Jul 2016 12:40:51 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Mo",
"Jie-Xiong",
""
]
] | The critical phenomena of dilaton AdS black holes are probed from a totally different perspective other than the $P-v$ criticality and the $q-U$ criticality discussed in the former literature. We investigate not only the two point correlation function but also the entanglement entropy of dilaton AdS black holes. We ach... |
2312.17277 | Jainendra Kumar Singh Dr. | Harshna Balhara, J. K. Singh and Emmanuel N. Saridakis | Observational constraints and cosmographic analysis of
$f({T},{T}_{{G}})$ gravity and cosmology | 12 pages, 11 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We perform observational confrontation and cosmographic analysis of
$f(T,T_G)$ gravity and cosmology. This higher-order torsional gravity is based
on both the torsion scalar, as well as on the teleparallel equivalent of the
Gauss-Bonnet combination, and gives rise to an effective dark-energy sector
which depends on t... | [
{
"created": "Wed, 27 Dec 2023 19:28:25 GMT",
"version": "v1"
}
] | 2024-01-01 | [
[
"Balhara",
"Harshna",
""
],
[
"Singh",
"J. K.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We perform observational confrontation and cosmographic analysis of $f(T,T_G)$ gravity and cosmology. This higher-order torsional gravity is based on both the torsion scalar, as well as on the teleparallel equivalent of the Gauss-Bonnet combination, and gives rise to an effective dark-energy sector which depends on the... |
1508.05474 | Oleg Evnin | Ben Craps, Oleg Evnin, Puttarak Jai-akson, Joris Vanhoof | Ultraviolet asymptotics for quasiperiodic AdS_4 perturbations | 18 pages; v3: minor improvements, published version | JHEP 1510 (2015) 080 | 10.1007/JHEP10(2015)080 | null | gr-qc hep-th nlin.CD | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Spherically symmetric perturbations in AdS-scalar field systems of small
amplitude epsilon approximately periodic on time scales of order 1/epsilon^2
(in the sense that no significant transfer of energy between the AdS normal
modes occurs) have played an important role in considerations of AdS stability.
They are see... | [
{
"created": "Sat, 22 Aug 2015 07:23:10 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2015 04:54:35 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Oct 2015 05:53:11 GMT",
"version": "v3"
}
] | 2015-10-30 | [
[
"Craps",
"Ben",
""
],
[
"Evnin",
"Oleg",
""
],
[
"Jai-akson",
"Puttarak",
""
],
[
"Vanhoof",
"Joris",
""
]
] | Spherically symmetric perturbations in AdS-scalar field systems of small amplitude epsilon approximately periodic on time scales of order 1/epsilon^2 (in the sense that no significant transfer of energy between the AdS normal modes occurs) have played an important role in considerations of AdS stability. They are seen ... |
1802.04150 | Sumanta Chakraborty | Rabin Banerjee, Sumanta Chakraborty and Pradip Mukherjee | Late-time acceleration driven by shift-symmetric Galileon in the
presence of Torsion | Minor revision, Published version, 11 pages, 1 figure | Phys. Rev. D 98, 083506 (2018) | 10.1103/PhysRevD.98.083506 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A shift-symmetric Galileon model in presence of spacetime torsion has been
constructed for the first time. This has been realized by localizing (or,
gauging) the Galileon symmetry in flat spacetime in an appropriate manner. We
have applied the above model to study the evolution of the universe at a
cosmological scale... | [
{
"created": "Fri, 9 Feb 2018 11:40:25 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Oct 2018 00:48:31 GMT",
"version": "v2"
}
] | 2018-10-09 | [
[
"Banerjee",
"Rabin",
""
],
[
"Chakraborty",
"Sumanta",
""
],
[
"Mukherjee",
"Pradip",
""
]
] | A shift-symmetric Galileon model in presence of spacetime torsion has been constructed for the first time. This has been realized by localizing (or, gauging) the Galileon symmetry in flat spacetime in an appropriate manner. We have applied the above model to study the evolution of the universe at a cosmological scale. ... |
2106.13450 | Piyabut Burikham | Sitthichai Pinkanjanarod, Piyabut Burikham, Supakchai Ponglertsakul | Tidal Deformation and Radial Pulsations of Neutron Star with Holographic
Multiquark Core | 9 pages, 5 figures, to appear in EPJC | null | 10.1140/epjc/s10052-022-10106-5 | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | Tidal deformation of neutron star with multiquark core is calculated using
nuclear and multiquark equations of state. The equation of state of the
multiquark phase from the holographic Sakai-Sugimoto~(SS) model is relatively
stiff in the low density region and becomes softer at high densities. The
values of Love numb... | [
{
"created": "Fri, 25 Jun 2021 06:27:44 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Dec 2021 10:01:17 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Feb 2022 14:14:08 GMT",
"version": "v3"
}
] | 2022-03-02 | [
[
"Pinkanjanarod",
"Sitthichai",
""
],
[
"Burikham",
"Piyabut",
""
],
[
"Ponglertsakul",
"Supakchai",
""
]
] | Tidal deformation of neutron star with multiquark core is calculated using nuclear and multiquark equations of state. The equation of state of the multiquark phase from the holographic Sakai-Sugimoto~(SS) model is relatively stiff in the low density region and becomes softer at high densities. The values of Love number... |
2009.13433 | Patryk Mach | Patryk Mach, Andrzej Odrzywolek | Accretion of the relativistic Vlasov gas onto a moving Schwarzschild
black hole: Exact solutions | 22 pages, 8 figures | Phys. Rev. D 103, 024044 (2021) | 10.1103/PhysRevD.103.024044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive an exact, axially symmetric solution representing stationary
accretion of the relativistic, collisionless Vlasov gas onto a moving
Schwarzschild black hole. The gas is assumed to be in thermal equilibrium at
infinity, where it obeys the Maxwell-J\"{u}ttner distribution. The Vlasov
equation is solved analyti... | [
{
"created": "Mon, 28 Sep 2020 16:01:39 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Dec 2020 20:19:50 GMT",
"version": "v2"
},
{
"created": "Sun, 17 Jan 2021 19:34:40 GMT",
"version": "v3"
}
] | 2021-01-27 | [
[
"Mach",
"Patryk",
""
],
[
"Odrzywolek",
"Andrzej",
""
]
] | We derive an exact, axially symmetric solution representing stationary accretion of the relativistic, collisionless Vlasov gas onto a moving Schwarzschild black hole. The gas is assumed to be in thermal equilibrium at infinity, where it obeys the Maxwell-J\"{u}ttner distribution. The Vlasov equation is solved analytica... |
1902.00265 | Supakchai Ponglertsakul | Sirachak Panpanich, Supakchai Ponglertsakul and Kei-ichi Maeda | Cosmological Dynamics and Double Screening of DBI Galileon Gravity | 16 pages, 10 figures, matched with the PRD version | Phys. Rev. D 100, 044038 (2019) | 10.1103/PhysRevD.100.044038 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cosmological dynamics and screening mechanism of the
Dirac-Born-Infeld (DBI) Galileon model. The model has been divided into two
regimes, one has positive signs in front of scalar field kinetic terms
so-called the DBI galileon, another one has negative signs and it is dubbed as
the DBIonic galileon. We... | [
{
"created": "Fri, 1 Feb 2019 10:24:01 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Aug 2019 01:45:00 GMT",
"version": "v2"
}
] | 2019-08-28 | [
[
"Panpanich",
"Sirachak",
""
],
[
"Ponglertsakul",
"Supakchai",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We investigate cosmological dynamics and screening mechanism of the Dirac-Born-Infeld (DBI) Galileon model. The model has been divided into two regimes, one has positive signs in front of scalar field kinetic terms so-called the DBI galileon, another one has negative signs and it is dubbed as the DBIonic galileon. We f... |
gr-qc/9509053 | Jerome Martin | Jerome Martin | Cosmological perturbations and classical change of signature | 35 pages, latex, 2 figures available at jmartin@ccr.jussieu.fr, to
appear in Physical Review D | Phys.Rev. D52 (1995) 6708-6716 | 10.1103/PhysRevD.52.6708 | null | gr-qc | null | Cosmological perturbations on a manifold admitting signature change are
studied. The background solution consists in a Friedmann-Lemaitre-Robertson-
Walker (FLRW) Universe filled by a constant scalar field playing the role of a
cosmological constant. It is shown that no regular solution exist satisfying
the junction ... | [
{
"created": "Wed, 27 Sep 1995 13:48:26 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Martin",
"Jerome",
""
]
] | Cosmological perturbations on a manifold admitting signature change are studied. The background solution consists in a Friedmann-Lemaitre-Robertson- Walker (FLRW) Universe filled by a constant scalar field playing the role of a cosmological constant. It is shown that no regular solution exist satisfying the junction co... |
1709.01949 | Sebastian De Haro | Sebastian De Haro | The Invisibility of Diffeomorphisms | 28+7 pages, 1 figure. v2: published version, minor corrections | Foundations of Physics, 47 (11), 2017, pp. 1464-1497 | 10.1007/s10701-017-0117-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I examine the relationship between $(d+1)$-dimensional Poincar\'e metrics and
$d$-dimensional conformal manifolds, from both mathematical and physical
perspectives. The results have a bearing on several conceptual issues relating
to asymptotic symmetries, in general relativity and in gauge-gravity duality,
as follows... | [
{
"created": "Wed, 6 Sep 2017 18:06:06 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jan 2018 11:42:25 GMT",
"version": "v2"
}
] | 2018-01-04 | [
[
"De Haro",
"Sebastian",
""
]
] | I examine the relationship between $(d+1)$-dimensional Poincar\'e metrics and $d$-dimensional conformal manifolds, from both mathematical and physical perspectives. The results have a bearing on several conceptual issues relating to asymptotic symmetries, in general relativity and in gauge-gravity duality, as follows: ... |
1808.10602 | Gizem \c{S}eng\"or | Gizem \c{S}eng\"or | Hidden regimes during preheating | Sections IV and V and figures have been improved | Phys. Rev. D 100, 043503 (2019) | 10.1103/PhysRevD.100.043503 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Effective Field Theory (EFT) of Preheating with scalar fields, implies
three types of derivative couplings between the inflaton and the reheating
field. Two of these couplings lead to scales below which only one of the two
species appear as the low energy modes. In this paper, the variety of low
energy regimes in... | [
{
"created": "Fri, 31 Aug 2018 05:50:20 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Aug 2019 10:15:32 GMT",
"version": "v2"
}
] | 2019-08-21 | [
[
"Şengör",
"Gizem",
""
]
] | The Effective Field Theory (EFT) of Preheating with scalar fields, implies three types of derivative couplings between the inflaton and the reheating field. Two of these couplings lead to scales below which only one of the two species appear as the low energy modes. In this paper, the variety of low energy regimes in t... |
1703.08156 | Sebastian V\"olkel | Sebastian H. V\"olkel and Kostas D. Kokkotas | A Semi-analytic Study of Axial Perturbations of Ultra Compact Stars | Accepted for publication in CQG, 13 pages, 3 figures, 5 tables | null | 10.1088/1361-6382/aa68cc | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact object perturbations, at linear order, often lead in solving one or
more coupled wave equations. The study of these equations was typically done by
numerical or semi-analytical methods. The WKB method and the associated
Bohr-Sommerfeld rule have been proved extremely useful tools in the study of
black-hole pe... | [
{
"created": "Thu, 23 Mar 2017 17:33:11 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Völkel",
"Sebastian H.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | Compact object perturbations, at linear order, often lead in solving one or more coupled wave equations. The study of these equations was typically done by numerical or semi-analytical methods. The WKB method and the associated Bohr-Sommerfeld rule have been proved extremely useful tools in the study of black-hole pert... |
gr-qc/0503018 | Martin Zofka | Jiri Bicak and Joseph Katz | On the uniqueness of harmonic coordinates | 14 pages, no figures | Czech.J.Phys. 55 (2005) 105-118 | 10.1007/s10582-005-0024-z | null | gr-qc | null | Harmonic coordinate conditions in stationary asymptotically flat spacetimes
with matter sources have more than one solution. The solutions depend on the
degree of smoothness of the metric and its first derivatives, which we wish to
impose across the material boundary, and on the conditions at infinity and at a
suitab... | [
{
"created": "Fri, 4 Mar 2005 15:03:15 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Bicak",
"Jiri",
""
],
[
"Katz",
"Joseph",
""
]
] | Harmonic coordinate conditions in stationary asymptotically flat spacetimes with matter sources have more than one solution. The solutions depend on the degree of smoothness of the metric and its first derivatives, which we wish to impose across the material boundary, and on the conditions at infinity and at a suitable... |
2105.13243 | Maria Caruana | Sebastian Bahamonde, Maria Caruana, Konstantinos F. Dialektopoulos,
Viktor Gakis, Manuel Hohmann, Jackson Levi Said, Emmanuel N. Saridakis,
Joseph Sultana | Gravitational Wave Propagation and Polarizations in the Teleparallel
analog of Horndeski Gravity | null | null | 10.1103/PhysRevD.104.084082 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves (GWs) have opened a new window on fundamental physics in
a number of important ways. The next generation of GW detectors may reveal more
information about the polarization structure of GWs. Additionally, there is
growing interest in theories of gravity beyond GR. One such theory which
remains viab... | [
{
"created": "Thu, 27 May 2021 15:40:56 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Caruana",
"Maria",
""
],
[
"Dialektopoulos",
"Konstantinos F.",
""
],
[
"Gakis",
"Viktor",
""
],
[
"Hohmann",
"Manuel",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Saridakis",
"E... | Gravitational waves (GWs) have opened a new window on fundamental physics in a number of important ways. The next generation of GW detectors may reveal more information about the polarization structure of GWs. Additionally, there is growing interest in theories of gravity beyond GR. One such theory which remains viable... |
gr-qc/0508113 | Yuxiao Liu | Yu-Xiao Liu, Yi-Shi Duan, Li-Jie Zhang | Angular Momentum Conservation Law for Randall-Sundrum Models | 10 pages, no figures, accepted by Mod. Phys. Lett. A | Mod.Phys.Lett.A22:2855-2864,2007 | 10.1142/S0217732307023365 | null | gr-qc | null | In Randall-Sundrum models, by the use of general Noether theorem, the
covariant angular momentum conservation law is obtained with the respect to the
local Lorentz transformations. The angular momentum current has also
superpotential and is therefore identically conserved. The space-like
components $J_{ij}$ of the an... | [
{
"created": "Sat, 27 Aug 2005 14:55:33 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2005 04:24:55 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Sep 2005 09:43:05 GMT",
"version": "v3"
},
{
"created": "Mon, 1 Jan 2007 10:32:18 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Liu",
"Yu-Xiao",
""
],
[
"Duan",
"Yi-Shi",
""
],
[
"Zhang",
"Li-Jie",
""
]
] | In Randall-Sundrum models, by the use of general Noether theorem, the covariant angular momentum conservation law is obtained with the respect to the local Lorentz transformations. The angular momentum current has also superpotential and is therefore identically conserved. The space-like components $J_{ij}$ of the angu... |
2401.06844 | David Trestini | David Trestini | Quasi-Keplerian parametrization for eccentric compact binaries in
scalar-tensor theories at second post-Newtonian order and applications | 22 pages, 1 table, 3 figures. v2: some references were added. v3:
title changed, and other minor changes reflecting the referee report. v4:
minor modifications, matches the version published in PRD | Phys. Rev. D 109, 104003 (2024) | 10.1103/PhysRevD.109.104003 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The generalized post-Keplerian parametrization for compact binaries on
eccentric bound orbits is established at second post-Newtonian (2PN) order in a
class of massless scalar-tensor theories. This result is used to compute the
orbit-averaged flux of energy and angular momentum at Newtonian order, which
means relativ... | [
{
"created": "Fri, 12 Jan 2024 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jan 2024 11:53:16 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2024 16:49:19 GMT",
"version": "v3"
},
{
"created": "Thu, 2 May 2024 14:31:26 GMT",
"version": "v4"
}
] | 2024-05-03 | [
[
"Trestini",
"David",
""
]
] | The generalized post-Keplerian parametrization for compact binaries on eccentric bound orbits is established at second post-Newtonian (2PN) order in a class of massless scalar-tensor theories. This result is used to compute the orbit-averaged flux of energy and angular momentum at Newtonian order, which means relative ... |
gr-qc/9805035 | W. Robert Wood | A. Feoli, W.R. Wood, G. Papini | A dynamical symmetry breaking model in Weyl space | 18 pages, RevTex, to be published in J. Math. Phys | J.Math.Phys.39:3322-3331,1998 | 10.1063/1.532256 | REGINA - 98 - 1 | gr-qc | null | The dynamical process following the breaking of Weyl geometry to Riemannian
geometry is considered by studying the motion of de Sitter bubbles in a Weyl
vacuum. The bubbles are given in terms of an exact, spherically symmetric thin
shell solution to the Einstein equations in a Weyl-Dirac theory with a
time-dependent ... | [
{
"created": "Mon, 11 May 1998 15:52:48 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Feoli",
"A.",
""
],
[
"Wood",
"W. R.",
""
],
[
"Papini",
"G.",
""
]
] | The dynamical process following the breaking of Weyl geometry to Riemannian geometry is considered by studying the motion of de Sitter bubbles in a Weyl vacuum. The bubbles are given in terms of an exact, spherically symmetric thin shell solution to the Einstein equations in a Weyl-Dirac theory with a time-dependent sc... |
2306.11088 | Andrea Antonelli | Andrea Antonelli, Konstantinos Kritos, Ken K. Y. Ng, Roberto Cotesta,
Emanuele Berti | Classifying the generation and formation channels of individual
LIGO-Virgo-KAGRA observations from dynamically formed binaries | 9 pages, 2 figures. Public code at:
https://github.com/aantonelli94/TheBHClassifier | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address two important questions in gravitational-wave astronomy. What is
the astrophysical formation scenario leading to black-hole binary mergers? Did
some of the merging black holes form hierarchically through previous
generations of mergers? Leveraging fast-to-generate astrophysical simulations
from the rapster... | [
{
"created": "Mon, 19 Jun 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Antonelli",
"Andrea",
""
],
[
"Kritos",
"Konstantinos",
""
],
[
"Ng",
"Ken K. Y.",
""
],
[
"Cotesta",
"Roberto",
""
],
[
"Berti",
"Emanuele",
""
]
] | We address two important questions in gravitational-wave astronomy. What is the astrophysical formation scenario leading to black-hole binary mergers? Did some of the merging black holes form hierarchically through previous generations of mergers? Leveraging fast-to-generate astrophysical simulations from the rapster c... |
2209.03414 | Bivudutta Mishra Dr. | L.K. Duchaniya, S.A. Kadam, Jackson Levi Said, B. Mishra | Dynamical systems analysis in $f(T,\phi)$ gravity | 15 pages, 4 figures | Eur. Phys. J. C, 83, 27 (2023) | 10.1140/epjc/s10052-022-11155-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Teleparallel based cosmological models provide a description of gravity in
which torsion is the mediator of gravitation. Several extensions have been made
within the so-called Teleparallel equivalent of general relativity which is
equivalent to general relativity at the level of the equations of motion where
attempts... | [
{
"created": "Sat, 3 Sep 2022 04:47:42 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jan 2023 14:58:45 GMT",
"version": "v2"
}
] | 2023-01-18 | [
[
"Duchaniya",
"L. K.",
""
],
[
"Kadam",
"S. A.",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Mishra",
"B.",
""
]
] | Teleparallel based cosmological models provide a description of gravity in which torsion is the mediator of gravitation. Several extensions have been made within the so-called Teleparallel equivalent of general relativity which is equivalent to general relativity at the level of the equations of motion where attempts a... |
2201.03752 | Anna Ijjas | Anna Ijjas | Numerical Relativity as a New Tool for Fundamental Cosmology | 16 pages, 3 figures | Physics 4 (2022) 301-314 | 10.3390/physics4010021 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Advances in our understanding of the origin, evolution and structure of the
universe have long been driven by cosmological perturbation theory, model
building and effective field theory. In this review, we introduce numerical
relativity as a powerful new complementary tool for fundamental cosmology. To
illustrate its... | [
{
"created": "Tue, 11 Jan 2022 02:46:10 GMT",
"version": "v1"
}
] | 2022-03-08 | [
[
"Ijjas",
"Anna",
""
]
] | Advances in our understanding of the origin, evolution and structure of the universe have long been driven by cosmological perturbation theory, model building and effective field theory. In this review, we introduce numerical relativity as a powerful new complementary tool for fundamental cosmology. To illustrate its p... |
gr-qc/9706034 | Adrian Gentle | Adrian P. Gentle and Warner A. Miller | A fully (3+1)-D Regge calculus model of the Kasner cosmology | 22 pages, 5 eps figures, LaTeX. Updated and expanded version | Class.Quant.Grav. 15 (1998) 389-405 | 10.1088/0264-9381/15/2/013 | Monash Mathematics Report 97/24 | gr-qc | null | We describe the first discrete-time 4-dimensional numerical application of
Regge calculus. The spacetime is represented as a complex of 4-dimensional
simplices, and the geometry interior to each 4-simplex is flat Minkowski
spacetime. This simplicial spacetime is constructed so as to be foliated with a
one parameter f... | [
{
"created": "Fri, 13 Jun 1997 01:48:01 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jan 1998 03:13:06 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Gentle",
"Adrian P.",
""
],
[
"Miller",
"Warner A.",
""
]
] | We describe the first discrete-time 4-dimensional numerical application of Regge calculus. The spacetime is represented as a complex of 4-dimensional simplices, and the geometry interior to each 4-simplex is flat Minkowski spacetime. This simplicial spacetime is constructed so as to be foliated with a one parameter fam... |
2110.05396 | Iarley P. Lobo Dr | Iarley P. Lobo, Luis C. N. Santos, V. B. Bezerra, J. P. Morais
Gra\c{c}a and H. Moradpour | The extended phase space thermodynamics of Planck-scale-corrected
Reissner-Nordstr\"om-anti-de Sitter black hole | 13 pages, 7 figures. Matches published version | Nuclear Physics B 972 (2021) 115568 | 10.1016/j.nuclphysb.2021.115568 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We analyze the effect of Planck-scale modified radiation equation of state on
the Reissner-Nodstr\"om-anti-de Sitter black hole inspired by Kiselev's ansatz.
Deformed thermodynamic quantities are found, phase transitions and black holes
as heat engines are described for the Carnot and square cycles. Non-trivial
diffe... | [
{
"created": "Mon, 11 Oct 2021 16:34:48 GMT",
"version": "v1"
}
] | 2021-10-12 | [
[
"Lobo",
"Iarley P.",
""
],
[
"Santos",
"Luis C. N.",
""
],
[
"Bezerra",
"V. B.",
""
],
[
"Graça",
"J. P. Morais",
""
],
[
"Moradpour",
"H.",
""
]
] | We analyze the effect of Planck-scale modified radiation equation of state on the Reissner-Nodstr\"om-anti-de Sitter black hole inspired by Kiselev's ansatz. Deformed thermodynamic quantities are found, phase transitions and black holes as heat engines are described for the Carnot and square cycles. Non-trivial differe... |
1704.08163 | Giorgio Papini | Giorgio Papini | Classical and Quantum Aspects of Particle Propagation in External
Gravitational Fields | 8 pages | null | 10.1142/S0218271817501371 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the study of covariant wave equations, linear gravity manifests itself
through the metric deviation $\gamma_{\mu\nu}$ and a two-point vector potential
$K_{\lambda}$ itself constructed from $\gamma_{\mu\nu}$ and its derivatives.
The simultaneous presence of the two gravitational potentials is non
contradictory. Par... | [
{
"created": "Wed, 26 Apr 2017 15:31:52 GMT",
"version": "v1"
}
] | 2017-10-04 | [
[
"Papini",
"Giorgio",
""
]
] | In the study of covariant wave equations, linear gravity manifests itself through the metric deviation $\gamma_{\mu\nu}$ and a two-point vector potential $K_{\lambda}$ itself constructed from $\gamma_{\mu\nu}$ and its derivatives. The simultaneous presence of the two gravitational potentials is non contradictory. Parti... |
2206.07500 | Mohammad Nouri-Zonoz | M. Nouri-Zonoz, A. Parvizi and H. Forghani | Metamaterial analog of a black hole shadow: An exact ray-tracing
simulation based on the spacetime index of refraction | 14 pages, 7 figures, typos corrected and the resolution of last
figure is enhanced | null | 10.1103/PhysRevD.106.124013 | null | gr-qc physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter first we show that the equation of null geodesics in
spherically symmetric spacetimes in isotropic coordinates is identical to the
equation of light ray trajectories in isotropic media in flat spacetime. Based
on this analogy we introduce an exact simulation of the light ray trajectories
both in these ... | [
{
"created": "Wed, 15 Jun 2022 12:51:11 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2022 21:20:51 GMT",
"version": "v2"
}
] | 2022-12-21 | [
[
"Nouri-Zonoz",
"M.",
""
],
[
"Parvizi",
"A.",
""
],
[
"Forghani",
"H.",
""
]
] | In this letter first we show that the equation of null geodesics in spherically symmetric spacetimes in isotropic coordinates is identical to the equation of light ray trajectories in isotropic media in flat spacetime. Based on this analogy we introduce an exact simulation of the light ray trajectories both in these sp... |
2008.12251 | Pisin Chen | Kuan-Nan Lin, Chih-En Chou, Pisin Chen | Particle Production by a Relativistic Semi-Transparent Mirror in 1+3D
Minkowski Spacetime | 9 pages, 3 figures | Phys. Rev. D 103, 025014 (2021) | 10.1103/PhysRevD.103.025014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Production of scalar particles by a relativistic, semi-transparent mirror in
1+3D Minkowski spacetime based on the Barton-Calogeracos (BC) action is
investigated. The corresponding Bogoliubov coefficients are derived for a
mirror with arbitrary trajectory. In particular, we apply our derived formula
to the gravitatio... | [
{
"created": "Thu, 27 Aug 2020 16:47:24 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 2020 07:41:36 GMT",
"version": "v2"
}
] | 2021-01-20 | [
[
"Lin",
"Kuan-Nan",
""
],
[
"Chou",
"Chih-En",
""
],
[
"Chen",
"Pisin",
""
]
] | Production of scalar particles by a relativistic, semi-transparent mirror in 1+3D Minkowski spacetime based on the Barton-Calogeracos (BC) action is investigated. The corresponding Bogoliubov coefficients are derived for a mirror with arbitrary trajectory. In particular, we apply our derived formula to the gravitationa... |
1902.03590 | John W. Barrett | John W. Barrett, Paul Druce and Lisa Glaser | Spectral estimators for finite non-commutative geometries | 27 pages, final version with typos and references corrected | null | 10.1088/1751-8121/ab22f8 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A finite non-commutative geometry consists of a fuzzy space together with a
Dirac operator satisfying the axioms of a real spectral triple. This paper
addreses the question of how to extract information about these geometries from
the spectrum of the Dirac operator. Since the Dirac operator is a
finite-dimensional ma... | [
{
"created": "Sun, 10 Feb 2019 12:59:46 GMT",
"version": "v1"
},
{
"created": "Mon, 20 May 2019 17:24:28 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jun 2019 13:54:24 GMT",
"version": "v3"
}
] | 2019-09-04 | [
[
"Barrett",
"John W.",
""
],
[
"Druce",
"Paul",
""
],
[
"Glaser",
"Lisa",
""
]
] | A finite non-commutative geometry consists of a fuzzy space together with a Dirac operator satisfying the axioms of a real spectral triple. This paper addreses the question of how to extract information about these geometries from the spectrum of the Dirac operator. Since the Dirac operator is a finite-dimensional matr... |
0905.4530 | Silke Weinfurtner | Silke Weinfurtner (University of British Columbia), Angela White
(Newcastle University), and Matt Visser (Victoria University of Wellington) | Signature-change events in emergent spacetimes with anisotropic scaling | Based on a presentation by Silke Weinfurtner at the NEB XIII
conference in Thessaloniki in June 2008; 9 pages | J.Phys.Conf.Ser.189:012046,2009 | 10.1088/1742-6596/189/1/012046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the behaviour of quantum fields coupled to a spacetime
geometry exhibiting finite regions of Euclidean (Riemannian) signature.
Although from a gravity perspective this situation might seem somewhat far
fetched, we will demonstrate its direct physical relevance for an explicitly
realizable condensed mat... | [
{
"created": "Thu, 28 May 2009 00:17:45 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"Weinfurtner",
"Silke",
"",
"University of British Columbia"
],
[
"White",
"Angela",
"",
"Newcastle University"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | We investigate the behaviour of quantum fields coupled to a spacetime geometry exhibiting finite regions of Euclidean (Riemannian) signature. Although from a gravity perspective this situation might seem somewhat far fetched, we will demonstrate its direct physical relevance for an explicitly realizable condensed matte... |
1604.02143 | Rajeev Kumar Jain | Debika Chowdhury, L. Sriramkumar and Rajeev Kumar Jain | Duality and scale invariant magnetic fields from bouncing universes | v1: 17 pages, 5 figures; v2: 14 pages, 5 figures, bouncing model
details and discussion extended, references added, to appear in Phys. Rev. D | Phys. Rev. D 94, 083512 (2016) | 10.1103/PhysRevD.94.083512 | CP3-Origins-2016-018 DNRF90 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, we had numerically shown that, for a non-minimal coupling that is a
simple power of the scale factor, scale invariant magnetic fields arise in a
class of bouncing universes. In this work, we {\it analytically} evaluate the
spectrum of magnetic and electric fields generated in a sub-class of such
models. We ... | [
{
"created": "Thu, 7 Apr 2016 13:13:22 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2016 23:39:37 GMT",
"version": "v2"
}
] | 2016-10-19 | [
[
"Chowdhury",
"Debika",
""
],
[
"Sriramkumar",
"L.",
""
],
[
"Jain",
"Rajeev Kumar",
""
]
] | Recently, we had numerically shown that, for a non-minimal coupling that is a simple power of the scale factor, scale invariant magnetic fields arise in a class of bouncing universes. In this work, we {\it analytically} evaluate the spectrum of magnetic and electric fields generated in a sub-class of such models. We il... |
2108.13484 | Roldao da Rocha | Roldao da Rocha | AdS graviton stars and differential configurational entropy | 6 pages, 1 figure | Phys. Lett. B 823 (2021) 136729 | 10.1016/j.physletb.2021.136729 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | AdS graviton stars are studied in the differential configurational entropy
setup, as solutions of the effective Einstein field equations that backreact to
compactification. With the critical central density of AdS graviton stars, the
differential configurational entropy is derived and computed, presenting global
mini... | [
{
"created": "Mon, 30 Aug 2021 19:13:56 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Oct 2021 17:02:48 GMT",
"version": "v2"
}
] | 2021-10-20 | [
[
"da Rocha",
"Roldao",
""
]
] | AdS graviton stars are studied in the differential configurational entropy setup, as solutions of the effective Einstein field equations that backreact to compactification. With the critical central density of AdS graviton stars, the differential configurational entropy is derived and computed, presenting global minima... |
0705.0720 | Paul Halpern | Paul Halpern | Energy Distribution of a Charged Black Hole with a Minimally Coupled
Scalar Field | 11 pages; To appear in Astrophysics and Space Science | Astrophys.SpaceSci.313:357-361,2008 | 10.1007/s10509-007-9704-4 | null | gr-qc astro-ph | null | Using three different energy-momentum complexes, the Einstein,
Landau-Lifshitz, and Papapetrou prescriptions, we calculate the energy of an
electrically charged black hole exact solution with a self-interacting,
minimally-coupled scalar field and the asymptotic region locally an
Anti-deSitter spacetime. Writing the m... | [
{
"created": "Sat, 5 May 2007 01:25:14 GMT",
"version": "v1"
},
{
"created": "Wed, 30 May 2007 15:28:27 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Nov 2007 02:08:17 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Halpern",
"Paul",
""
]
] | Using three different energy-momentum complexes, the Einstein, Landau-Lifshitz, and Papapetrou prescriptions, we calculate the energy of an electrically charged black hole exact solution with a self-interacting, minimally-coupled scalar field and the asymptotic region locally an Anti-deSitter spacetime. Writing the met... |
1111.4595 | Nikodem Poplawski | Nikodem Poplawski | Nonsingular, big-bounce cosmology from spinor-torsion coupling | 7 pages; published version | Phys. Rev. D 85, 107502 (2012) | 10.1103/PhysRevD.85.107502 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein-Cartan-Sciama-Kibble theory of gravity removes the constraint of
general relativity that the affine connection be symmetric by regarding its
antisymmetric part, the torsion tensor, as a dynamical variable. The minimal
coupling between the torsion tensor and Dirac spinors generates a spin-spin
interaction... | [
{
"created": "Sun, 20 Nov 2011 00:01:39 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2012 23:19:54 GMT",
"version": "v2"
}
] | 2012-07-06 | [
[
"Poplawski",
"Nikodem",
""
]
] | The Einstein-Cartan-Sciama-Kibble theory of gravity removes the constraint of general relativity that the affine connection be symmetric by regarding its antisymmetric part, the torsion tensor, as a dynamical variable. The minimal coupling between the torsion tensor and Dirac spinors generates a spin-spin interaction w... |
2109.00564 | Che-Yu Chen | Che-Yu Chen, Hsiang-Yi Karen Yang | Curved accretion disks around rotating black holes without reflection
symmetry | 23 pages, 5 figures, version to appear in EPJC | Eur. Phys. J. C (2022) 82:307 | 10.1140/epjc/s10052-022-10263-7 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rotating black holes without equatorial reflection symmetry can naturally
arise in effective low-energy theories of fundamental quantum gravity, in
particular, when parity-violating interactions are introduced. Adopting a
theory-agnostic approach and considering a recently proposed Kerr-like black
hole model, we inve... | [
{
"created": "Wed, 1 Sep 2021 18:26:55 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2021 01:24:20 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Mar 2022 18:43:59 GMT",
"version": "v3"
}
] | 2022-04-11 | [
[
"Chen",
"Che-Yu",
""
],
[
"Yang",
"Hsiang-Yi Karen",
""
]
] | Rotating black holes without equatorial reflection symmetry can naturally arise in effective low-energy theories of fundamental quantum gravity, in particular, when parity-violating interactions are introduced. Adopting a theory-agnostic approach and considering a recently proposed Kerr-like black hole model, we invest... |
1805.00240 | Bobir Toshmatov | Bobir Toshmatov, Zden\v{e}k Stuchl\'ik, Jan Schee, Bobomurat Ahmedov | Electromagnetic perturbations of black holes in general relativity
coupled to nonlinear electrodynamics | 11 pages, 9 figures | Phys. Rev. D 97, 084058 (2018) | 10.1103/PhysRevD.97.084058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electromagnetic (EM) perturbations of the black hole solutions in general
relativity coupled to nonlinear electrodynamics (NED) are studied for both
electrically and magnetically charged black holes, assuming that the EM
perturbations do not alter the spacetime geometry. It is shown that the
effective potentials ... | [
{
"created": "Tue, 1 May 2018 08:56:40 GMT",
"version": "v1"
}
] | 2018-05-02 | [
[
"Toshmatov",
"Bobir",
""
],
[
"Stuchlík",
"Zdeněk",
""
],
[
"Schee",
"Jan",
""
],
[
"Ahmedov",
"Bobomurat",
""
]
] | The electromagnetic (EM) perturbations of the black hole solutions in general relativity coupled to nonlinear electrodynamics (NED) are studied for both electrically and magnetically charged black holes, assuming that the EM perturbations do not alter the spacetime geometry. It is shown that the effective potentials of... |
2002.00980 | Basem Mahmoud El-Menoufi | Basem Kamal El-Menoufi and Sonali Mohapatra | What can Black Holes teach us about the IR and UV? | 6 pages. To appear in Physical Review D | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Combining insights from both the effective field theory of quantum gravity
and black hole thermodynamics, we derive two novel consistency relations to be
satisfied by any quantum theory of gravity. First, we show that a particular
combination of the number of massless (light) fields in the theory must take
integer va... | [
{
"created": "Mon, 3 Feb 2020 19:01:09 GMT",
"version": "v1"
}
] | 2020-02-05 | [
[
"El-Menoufi",
"Basem Kamal",
""
],
[
"Mohapatra",
"Sonali",
""
]
] | Combining insights from both the effective field theory of quantum gravity and black hole thermodynamics, we derive two novel consistency relations to be satisfied by any quantum theory of gravity. First, we show that a particular combination of the number of massless (light) fields in the theory must take integer valu... |
2405.13737 | Iris van Gemeren | Iris van Gemeren, Tanja Hinderer, Stefan Vandoren | Massive scalar clouds and black hole spacetimes in Gauss-Bonnet gravity | 17 pages + appendix, 12 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study static black holes in scalar-Gauss-Bonnet (sGB) gravity with a
massive scalar field as an example of higher curvature gravity. The scalar mass
introduces an additional scale and leads to a strong suppression of the scalar
field beyond its Compton wavelength. We numerically compute sGB black hole
spacetimes a... | [
{
"created": "Wed, 22 May 2024 15:29:44 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"van Gemeren",
"Iris",
""
],
[
"Hinderer",
"Tanja",
""
],
[
"Vandoren",
"Stefan",
""
]
] | We study static black holes in scalar-Gauss-Bonnet (sGB) gravity with a massive scalar field as an example of higher curvature gravity. The scalar mass introduces an additional scale and leads to a strong suppression of the scalar field beyond its Compton wavelength. We numerically compute sGB black hole spacetimes and... |
1307.5029 | Norbert Bodendorfer | Norbert Bodendorfer | Black hole entropy from loop quantum gravity in higher dimensions | 6 pages. v3: journal version, minor clarifications | Phys. Lett. B 726: 887-891 (2013) | 10.1016/j.physletb.2013.09.043 | IGC-13/7-4 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a derivation for computing black hole entropy for spherical
non-rotating isolated horizons from loop quantum gravity in four and higher
dimensions. The state counting problem effectively reduces to the well studied
3+1-dimensional one based on an SU(2)-Chern-Simons theory, differing only in
the precise for... | [
{
"created": "Thu, 18 Jul 2013 18:14:42 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2013 17:46:41 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Oct 2013 14:11:39 GMT",
"version": "v3"
}
] | 2013-10-28 | [
[
"Bodendorfer",
"Norbert",
""
]
] | We propose a derivation for computing black hole entropy for spherical non-rotating isolated horizons from loop quantum gravity in four and higher dimensions. The state counting problem effectively reduces to the well studied 3+1-dimensional one based on an SU(2)-Chern-Simons theory, differing only in the precise form ... |
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