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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2007.05064 | Fabio D'Ambrosio | Fabio D'Ambrosio and Lavinia Heisenberg | Classification of Primary Constraints of Quadratic Non-Metricity
Theories of Gravity | 8 pages, 3 tables, 1 figure | null | 10.1007/JHEP02(2021)170 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the ADM decomposition of a five-parameter family of quadratic
non-metricity theories and study their conjugate momenta. After systematically
identifying all possible conditions which can be imposed on the parameters such
that different sets of primary constraints arise, we find that the
five-parametric the... | [
{
"created": "Thu, 9 Jul 2020 21:03:49 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 2020 20:18:05 GMT",
"version": "v2"
}
] | 2021-03-17 | [
[
"D'Ambrosio",
"Fabio",
""
],
[
"Heisenberg",
"Lavinia",
""
]
] | We perform the ADM decomposition of a five-parameter family of quadratic non-metricity theories and study their conjugate momenta. After systematically identifying all possible conditions which can be imposed on the parameters such that different sets of primary constraints arise, we find that the five-parametric theor... |
2212.05564 | Dmitri Fursaev | D.V. Fursaev and I.G. Pirozhenko | Electrodynamics under Action of Null Cosmic Strings | 22 pages, 11 figures, new figure added | null | 10.1103/PhysRevD.107.025018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method to study electromagnetic (EM) effects generated by a straight null
cosmic string moving in classical EM fields is suggested. The string is shown
to induce an additional EM field which can be described as a solution to
homogeneous Maxwell equations with initial data set on a null surface, the
string event hor... | [
{
"created": "Sun, 11 Dec 2022 18:11:51 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Dec 2022 18:30:29 GMT",
"version": "v2"
}
] | 2023-02-15 | [
[
"Fursaev",
"D. V.",
""
],
[
"Pirozhenko",
"I. G.",
""
]
] | A method to study electromagnetic (EM) effects generated by a straight null cosmic string moving in classical EM fields is suggested. The string is shown to induce an additional EM field which can be described as a solution to homogeneous Maxwell equations with initial data set on a null surface, the string event horiz... |
2205.09112 | Matteo Breschi | Matteo Breschi, Sebastiano Bernuzzi, Kabir Chakravarti, Alessandro
Camilletti, Aviral Prakash, Albino Perego | Kilohertz Gravitational Waves From Binary Neutron Star Mergers:
Numerical-relativity Informed Postmerger Model | null | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We present ${\tt NRPMw}$, an analytical model of gravitational-waves from
neutron star merger remnants informed using 618 numerical relativity (NR)
simulations. ${\tt NRPMw}$ is designed in the frequency domain using a
combination of complex Gaussian wavelets. The wavelet's parameters are
calibrated to equations of s... | [
{
"created": "Wed, 18 May 2022 17:59:15 GMT",
"version": "v1"
}
] | 2022-05-19 | [
[
"Breschi",
"Matteo",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Chakravarti",
"Kabir",
""
],
[
"Camilletti",
"Alessandro",
""
],
[
"Prakash",
"Aviral",
""
],
[
"Perego",
"Albino",
""
]
] | We present ${\tt NRPMw}$, an analytical model of gravitational-waves from neutron star merger remnants informed using 618 numerical relativity (NR) simulations. ${\tt NRPMw}$ is designed in the frequency domain using a combination of complex Gaussian wavelets. The wavelet's parameters are calibrated to equations of sta... |
1801.08396 | Magd Elias Kahil | Magd E. Kahil | Dark Matter: The Problem of Motion | 17 LaTex pages | null | 10.1134/S020228931903006X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Equations of non-geodesic and non-geodesic deviations for different particles
are obtained, using a specific type of classes of the Bazanski Lagrangian. Such
type of paths has been found to describe the problem of variable mass in the
presence of Riemannian geometry. This may give rise to detect the effect of
dark ma... | [
{
"created": "Thu, 25 Jan 2018 13:34:27 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2018 00:54:47 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Apr 2019 08:26:29 GMT",
"version": "v3"
}
] | 2019-09-04 | [
[
"Kahil",
"Magd E.",
""
]
] | Equations of non-geodesic and non-geodesic deviations for different particles are obtained, using a specific type of classes of the Bazanski Lagrangian. Such type of paths has been found to describe the problem of variable mass in the presence of Riemannian geometry. This may give rise to detect the effect of dark matt... |
2112.06312 | Branko Dragovich | Ivan Dimitrijevic, Branko Dragovich, Zoran Rakic and Jelena Stankovic | New Cosmological Solutions of a Nonlocal Gravity Model | 18 pages, submitted to the journal Symmetry | Symmetry 2022, 14, 3 | 10.3390/sym14010003 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A nonlocal gravity model (2.1) was introduced and considered recently [49],
and two exact cosmological solutions in flat space were presented. The first
solution is related to some radiation effects generated by nonlocal dynamics on
dark energy background, while the second one is a nonsingular time symmetric
bounce. ... | [
{
"created": "Sun, 12 Dec 2021 20:05:12 GMT",
"version": "v1"
}
] | 2022-01-07 | [
[
"Dimitrijevic",
"Ivan",
""
],
[
"Dragovich",
"Branko",
""
],
[
"Rakic",
"Zoran",
""
],
[
"Stankovic",
"Jelena",
""
]
] | A nonlocal gravity model (2.1) was introduced and considered recently [49], and two exact cosmological solutions in flat space were presented. The first solution is related to some radiation effects generated by nonlocal dynamics on dark energy background, while the second one is a nonsingular time symmetric bounce. In... |
2212.11437 | Xuefeng Zhang | Lu Zheng, Shutao Yang, Xuefeng Zhang | Doppler effect in TianQin time-delay interferometry | 10 pages, 11 figures, revised to match the version accepted by Phys.
Rev. D | Phys. Rev. D 108, 022001 (2023) | 10.1103/PhysRevD.108.022001 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | The current design of space-based gravitational wave detectors utilizes
heterodyne laser interferometry in inter-satellite science measurements.
Frequency variations of the heterodyne beatnotes are predominantly caused by
the Doppler effect from relative satellite motion along lines of sight.
Generally considered to ... | [
{
"created": "Thu, 22 Dec 2022 01:02:30 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2023 01:50:22 GMT",
"version": "v2"
}
] | 2023-07-19 | [
[
"Zheng",
"Lu",
""
],
[
"Yang",
"Shutao",
""
],
[
"Zhang",
"Xuefeng",
""
]
] | The current design of space-based gravitational wave detectors utilizes heterodyne laser interferometry in inter-satellite science measurements. Frequency variations of the heterodyne beatnotes are predominantly caused by the Doppler effect from relative satellite motion along lines of sight. Generally considered to be... |
1004.3937 | Fabio Dahia | F. Dahia and P. J. Felix da Silva | Static Observers in Curved Spaces and Non-inertial Frames in Minkowski
Spacetime | 28 pages, 4 figures. | null | 10.1007/s10714-010-1086-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Static observers in curved spacetimes may interpret their proper acceleration
as the opposite of a local gravitational field (in the Newtonian sense). Based
on this interpretation and motivated by the equivalence principle, we are led
to investigate congruences of timelike curves in Minkowski spacetime whose
accelera... | [
{
"created": "Thu, 22 Apr 2010 14:52:41 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Dahia",
"F.",
""
],
[
"da Silva",
"P. J. Felix",
""
]
] | Static observers in curved spacetimes may interpret their proper acceleration as the opposite of a local gravitational field (in the Newtonian sense). Based on this interpretation and motivated by the equivalence principle, we are led to investigate congruences of timelike curves in Minkowski spacetime whose accelerati... |
gr-qc/0304061 | Grigori Volovik | G.E. Volovik | Phenomenology of effective gravity | LaTeX file, 29 pages, no figures, prepared for proceedings of the
COSLAB school in Krakow, 2002; discussion on energy-momentum tensor is
extended, references are added | in: Patterns of Symmetry Breaking, H. Arodz et al. (eds.), Kluwer
Academic Publishers (2003), pp. 381--404 | null | null | gr-qc cond-mat hep-ph | null | The cosmological constant is not an absolute constant. The gravitating part
of the vacuum energy is adjusted to the energy density of matter and to other
types of the perturbations of the vacuum. We discuss how the vacuum energy
responds (i) to the curvature of space in the Einstein closed Universe; (ii) to
the expan... | [
{
"created": "Wed, 16 Apr 2003 13:13:41 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2003 12:11:21 GMT",
"version": "v2"
},
{
"created": "Wed, 7 May 2003 13:46:01 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Volovik",
"G. E.",
""
]
] | The cosmological constant is not an absolute constant. The gravitating part of the vacuum energy is adjusted to the energy density of matter and to other types of the perturbations of the vacuum. We discuss how the vacuum energy responds (i) to the curvature of space in the Einstein closed Universe; (ii) to the expansi... |
1111.0263 | Papantonopoulos Eleftherios | Theodoros Kolyvaris, George Koutsoumbas, Eleftherios Papantonopoulos
and George Siopsis | Scalar Hair from a Derivative Coupling of a Scalar Field to the Einstein
Tensor | 24 pages, 13 figures, title changed, improved discussion of the first
order perturbative analysis, reference added, published version | null | 10.1088/0264-9381/29/20/205011 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We consider a gravitating system of vanishing cosmological constant
consisting of an electromagnetic field and a scalar field coupled to the
Einstein tensor. A Reissner-Nordstr\"om black hole undergoes a second-order
phase transition to a hairy black hole of generally anisotropic hair at a
certain critical temperatur... | [
{
"created": "Tue, 1 Nov 2011 18:21:44 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2012 18:54:47 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Kolyvaris",
"Theodoros",
""
],
[
"Koutsoumbas",
"George",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Siopsis",
"George",
""
]
] | We consider a gravitating system of vanishing cosmological constant consisting of an electromagnetic field and a scalar field coupled to the Einstein tensor. A Reissner-Nordstr\"om black hole undergoes a second-order phase transition to a hairy black hole of generally anisotropic hair at a certain critical temperature ... |
1306.4899 | Sante Carloni Dr | C. Garc\'ia-Meca, S. Carloni, C. Barcel\'o, G. Jannes, J.
S\'anchez-Dehesa, A. Mart\'inez | Spacetime transformation acoustics | 10 pages, 2 figures, published in Wave Motion 51, 785-797 (2014) | null | 10.1016/j.wavemoti.2014.01.008 | null | gr-qc cond-mat.mes-hall cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recently proposed analogue transformation method has allowed the extension
of transformation acoustics to general spacetime transformations. We analyze
here in detail the differences between this new analogue transformation
acoustics (ATA) method and the standard one (STA). We show explicitly that STA
is not suitab... | [
{
"created": "Thu, 20 Jun 2013 14:55:47 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 2014 09:59:55 GMT",
"version": "v2"
}
] | 2014-07-09 | [
[
"García-Meca",
"C.",
""
],
[
"Carloni",
"S.",
""
],
[
"Barceló",
"C.",
""
],
[
"Jannes",
"G.",
""
],
[
"Sánchez-Dehesa",
"J.",
""
],
[
"Martínez",
"A.",
""
]
] | A recently proposed analogue transformation method has allowed the extension of transformation acoustics to general spacetime transformations. We analyze here in detail the differences between this new analogue transformation acoustics (ATA) method and the standard one (STA). We show explicitly that STA is not suitable... |
1007.4213 | Richard O'Shaughnessy | Richard O'Shaughnessy (1,4), Birjoo Vaishnav (2), James Healy (3),
Deirdre Shoemaker (3) ((1) Center for Gravitational Wave Physics, Penn State
University, (2) Center for Gravitational Wave Astronomy, The University of
Texas at Brownsville, (3) Center for Relativistic Astrophysics, Georgia Tech,
(4) Center for ... | Intrinsic selection biases of ground-based gravitational wave searches
for high-mass BH-BH mergers | 18 pages, 15 figures, accepted by PRD. v2 is version accepted for
publication, including minor changes in response to referee feedback and
updated citations | Phys.Rev.D82:104006,2010 | 10.1103/PhysRevD.82.104006 | LIGO DCC P1000069; IGC-10/7-2 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The next generation of ground-based gravitational wave detectors may detect a
few mergers of comparable-mass M\simeq 100-1000 Msun ("intermediate-mass'', or
IMBH) spinning black holes. Black hole spin is known to have a significant
impact on the orbit, merger signal, and post-merger ringdown of any binary with
non-ne... | [
{
"created": "Fri, 23 Jul 2010 20:45:02 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2010 17:02:15 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"O'Shaughnessy",
"Richard",
""
],
[
"Vaishnav",
"Birjoo",
""
],
[
"Healy",
"James",
""
],
[
"Shoemaker",
"Deirdre",
""
]
] | The next generation of ground-based gravitational wave detectors may detect a few mergers of comparable-mass M\simeq 100-1000 Msun ("intermediate-mass'', or IMBH) spinning black holes. Black hole spin is known to have a significant impact on the orbit, merger signal, and post-merger ringdown of any binary with non-negl... |
1809.09820 | Ernesto Contreras | Ernesto Contreras and Pedro Bargue\~no | Minimal Geometric Deformation in asymptotically (A-)dS space-times and
the isotropic sector for a polytropic black hole | 5 pages, typos corrected, references added | Eur. Phys. J. C 79, 985 (2018) | 10.1140/epjc/s10052-018-6472-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the Minimal Geometric Deformation method, in this paper we
implement the inverse problem in a black hole scenario. In order to deal with
an anisotropic polytropic black hole solution of the Einstein field equations
with cosmological constant, the deformation method is slightly extended. After
obtain... | [
{
"created": "Wed, 26 Sep 2018 06:15:37 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2018 13:40:16 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Dec 2018 13:06:29 GMT",
"version": "v3"
}
] | 2018-12-04 | [
[
"Contreras",
"Ernesto",
""
],
[
"Bargueño",
"Pedro",
""
]
] | In the context of the Minimal Geometric Deformation method, in this paper we implement the inverse problem in a black hole scenario. In order to deal with an anisotropic polytropic black hole solution of the Einstein field equations with cosmological constant, the deformation method is slightly extended. After obtainin... |
1004.3559 | Andrei V. Frolov | Andrei V. Frolov | Non-linear Dynamics and Primordial Curvature Perturbations from
Preheating | 15 pages, 10 figures; review for CQG special issue | Class.Quant.Grav.27:124006,2010 | 10.1088/0264-9381/27/12/124006 | SCG-2010-04 | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper I review the theory and numerical simulations of non-linear
dynamics of preheating, a stage of dynamical instability at the end of
inflation during which homogeneous inflaton explosively decays and deposits its
energy into excitation of other matter fields. I focus on preheating in chaotic
inflation mod... | [
{
"created": "Tue, 20 Apr 2010 20:21:05 GMT",
"version": "v1"
},
{
"created": "Thu, 13 May 2010 19:56:58 GMT",
"version": "v2"
}
] | 2015-03-14 | [
[
"Frolov",
"Andrei V.",
""
]
] | In this paper I review the theory and numerical simulations of non-linear dynamics of preheating, a stage of dynamical instability at the end of inflation during which homogeneous inflaton explosively decays and deposits its energy into excitation of other matter fields. I focus on preheating in chaotic inflation model... |
2004.06276 | Daichi Tsuna | Naritaka Oshita, Daichi Tsuna, Niayesh Afshordi | Quantum Black Hole Seismology II: Applications to Astrophysical Black
Holes | 14 pages, 14 figures. NO and DT equally contributed to this work.
Accepted for publication in PRD | Phys. Rev. D 102, 024046 (2020) | 10.1103/PhysRevD.102.024046 | RESCEU-5/20 | gr-qc astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the advent of gravitational wave astronomy, searching for gravitational
wave echoes from black holes (BHs) is becoming an interesting probe of their
quantum nature near their horizons. Newborn BHs may be strong emitters of
echoes, as they accompany large perturbations in the surrounding spacetime upon
formation.... | [
{
"created": "Tue, 14 Apr 2020 02:42:15 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 2020 01:28:45 GMT",
"version": "v2"
}
] | 2020-07-22 | [
[
"Oshita",
"Naritaka",
""
],
[
"Tsuna",
"Daichi",
""
],
[
"Afshordi",
"Niayesh",
""
]
] | With the advent of gravitational wave astronomy, searching for gravitational wave echoes from black holes (BHs) is becoming an interesting probe of their quantum nature near their horizons. Newborn BHs may be strong emitters of echoes, as they accompany large perturbations in the surrounding spacetime upon formation. U... |
2405.06565 | Masroor C. Pookkillath | Masroor C. Pookkillath, Kazuya Koyama | Theory of interacting vector dark energy and fluid | 25 pages, 5 figures, revtex | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we study interaction between dark energy and dark matter, where
dark energy is described by a massive vector field, and dark matter is modelled
as a fluid. We present new interaction term, which affects only perturbations
and can give interesting phenomenology. Then we present a general Lagrangian
for t... | [
{
"created": "Fri, 10 May 2024 16:09:55 GMT",
"version": "v1"
}
] | 2024-05-13 | [
[
"Pookkillath",
"Masroor C.",
""
],
[
"Koyama",
"Kazuya",
""
]
] | In this work, we study interaction between dark energy and dark matter, where dark energy is described by a massive vector field, and dark matter is modelled as a fluid. We present new interaction term, which affects only perturbations and can give interesting phenomenology. Then we present a general Lagrangian for the... |
2112.14273 | Puskar Mondal | Puskar Mondal | Local well-posedness of the Einstein-Yang-Mills system in CMCSHGC gauge | 32 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the local well-posedness of the Einstein-Yang-Mills equations in
constant mean extrinsic curvature spatial harmonic generalized Coulomb gauge
(CMCSHGC). In this choice of gauge, the complete Einstein-Yang-Mills equations
reduce to a coupled elliptic-hyperbolic system. Utilizing the method developed
by Anders... | [
{
"created": "Tue, 28 Dec 2021 19:18:47 GMT",
"version": "v1"
}
] | 2021-12-30 | [
[
"Mondal",
"Puskar",
""
]
] | We study the local well-posedness of the Einstein-Yang-Mills equations in constant mean extrinsic curvature spatial harmonic generalized Coulomb gauge (CMCSHGC). In this choice of gauge, the complete Einstein-Yang-Mills equations reduce to a coupled elliptic-hyperbolic system. Utilizing the method developed by Andersso... |
2405.09468 | Dimitrios Pesios | Dimitrios Pesios, Ioannis Koutalios, Dimitris Kugiumtzis, Nikolaos
Stergioulas | Predicting Binary Neutron Star Postmerger Spectra Using Artificial
Neural Networks | 20 pages, 12 figures, to be submitted to PRD | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves in the postmerger phase of binary neutron star mergers
may become detectable with planned upgrades of existing gravitational-wave
detectors or with more sensitive next-generation detectors. The construction of
template banks for the postmerger phase can facilitate signal detection and
parameter es... | [
{
"created": "Wed, 15 May 2024 16:03:51 GMT",
"version": "v1"
}
] | 2024-05-16 | [
[
"Pesios",
"Dimitrios",
""
],
[
"Koutalios",
"Ioannis",
""
],
[
"Kugiumtzis",
"Dimitris",
""
],
[
"Stergioulas",
"Nikolaos",
""
]
] | Gravitational waves in the postmerger phase of binary neutron star mergers may become detectable with planned upgrades of existing gravitational-wave detectors or with more sensitive next-generation detectors. The construction of template banks for the postmerger phase can facilitate signal detection and parameter esti... |
1902.01017 | Jian-Yang Zhu | Xi-Bin Li, Xiao-Gang Zheng and Jian-Yang Zhu | Spectra and entropy of multi-field warm inflation | 12 pages, 5 figures. Accepted for publication in Physical Review D | Phys.Rev.D99,043528(2019) | 10.1103/PhysRevD.99.043528 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the power spectra and entropy of two-field warm inflationary
scenario with canonical condition which is described by many-dimensional
stochastic differential equations. The field perturbations are analytically
calculated via a Volterra integral equation of the second kind, based on which
we obtain a spectra ... | [
{
"created": "Mon, 4 Feb 2019 02:53:54 GMT",
"version": "v1"
}
] | 2019-03-12 | [
[
"Li",
"Xi-Bin",
""
],
[
"Zheng",
"Xiao-Gang",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | We study the power spectra and entropy of two-field warm inflationary scenario with canonical condition which is described by many-dimensional stochastic differential equations. The field perturbations are analytically calculated via a Volterra integral equation of the second kind, based on which we obtain a spectra wi... |
gr-qc/9909033 | Randall Guedes Teixeira | J. T. Lunardi, B. M. Pimentel, R. G. Teixeira (Sao Paulo, IFT) | Duffin-Kemmer-Petiau equation in Riemannian space-times | LaTex, 23 pages, no figures. Minor misprints in version 2 corrected.
Final version published | Published in Geometrical Aspects of Quantum Fields, ed. by, A.A.
Bytsenko, A.E. Golcalves and B.M. Pimentel, World Scientific, 2001. pp 111.
ISBN 9810245025 | 10.1142/9789812810366_fmatter | null | gr-qc hep-th | null | In this work we analyze the generalization of Duffin-Kemmer-Petiau equation
to the case of Riemannian space-times and show that the usual results for
Klein-Gordon and Proca equations in Riemannian space-times can be fully
recovered when one selects, respectively, the spin 0 and 1 sectors of
Duffin-Kemmer-Petiau theor... | [
{
"created": "Fri, 10 Sep 1999 01:52:11 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2000 22:11:47 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Mar 2001 20:27:35 GMT",
"version": "v3"
}
] | 2020-05-19 | [
[
"Lunardi",
"J. T.",
"",
"Sao Paulo, IFT"
],
[
"Pimentel",
"B. M.",
"",
"Sao Paulo, IFT"
],
[
"Teixeira",
"R. G.",
"",
"Sao Paulo, IFT"
]
] | In this work we analyze the generalization of Duffin-Kemmer-Petiau equation to the case of Riemannian space-times and show that the usual results for Klein-Gordon and Proca equations in Riemannian space-times can be fully recovered when one selects, respectively, the spin 0 and 1 sectors of Duffin-Kemmer-Petiau theory. |
gr-qc/0407112 | Dr. Anirudh Pradhan | Anirudh Pradhan and Purnima Pandey | Some Bianchi Type I Viscous Fluid Cosmological Models with a Variable
Cosmological Constant | 16 pages | Astrophys.Space Sci. 301 (2006) 127-134 | 10.1007/s10509-006-0141-6 | null | gr-qc | null | Some Bianchi type I viscous fluid cosmological models with a variable
cosmological constant are investigated in which the expansion is considered
only in two direction i.e. one of the Hubble parameter $(H_{1} =
\frac{A_{4}}{A})$ is zero. The viscosity coefficient of bulk viscous fluid is
assumed to be a power functio... | [
{
"created": "Thu, 29 Jul 2004 10:38:30 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Pandey",
"Purnima",
""
]
] | Some Bianchi type I viscous fluid cosmological models with a variable cosmological constant are investigated in which the expansion is considered only in two direction i.e. one of the Hubble parameter $(H_{1} = \frac{A_{4}}{A})$ is zero. The viscosity coefficient of bulk viscous fluid is assumed to be a power function ... |
2312.11620 | David Radice | Harshraj Bandyopadhyay and David Radice and Aviral Prakash and Arnab
Dhani and Domenico Logoteta and Albino Perego and Rahul Kashyap | Do black holes remember what they are made of? | 15 pages, 7 figures. Accepted version | null | 10.1088/1361-6382/ad56ed | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the ringdown signal of black holes formed in prompt-collapse binary
neutron star mergers. We analyze data from $47$ numerical relativity
simulations. We show that the $(\ell=2,m=2)$ and $(\ell=2,m=1)$ multipoles of
the gravitational wave signal are well fitted by decaying damped exponentials,
as predicted by... | [
{
"created": "Mon, 18 Dec 2023 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2024 16:40:44 GMT",
"version": "v2"
}
] | 2024-06-13 | [
[
"Bandyopadhyay",
"Harshraj",
""
],
[
"Radice",
"David",
""
],
[
"Prakash",
"Aviral",
""
],
[
"Dhani",
"Arnab",
""
],
[
"Logoteta",
"Domenico",
""
],
[
"Perego",
"Albino",
""
],
[
"Kashyap",
"Rahul",
""
]
... | We study the ringdown signal of black holes formed in prompt-collapse binary neutron star mergers. We analyze data from $47$ numerical relativity simulations. We show that the $(\ell=2,m=2)$ and $(\ell=2,m=1)$ multipoles of the gravitational wave signal are well fitted by decaying damped exponentials, as predicted by b... |
1503.01888 | Roberto Casadio | Roberto Casadio, Octavian Micu, Dejan Stojkovic | Inner Horizon of the Quantum Reissner-Nordstr\"om Black Holes | RevTeX4, 7 pages, 4 figures: new section about HWF added for clarity,
references updated, results unchanged. Version to appear in JHEP | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nature of the inner Cauchy horizon of a Reissner-Nordstr\"om
black hole in a quantum context by means of the horizon wave-function obtained
from modelling the electrically charged source as a Gaussian wave-function. Our
main finding it that there is a significant range of black hole mass (around
the Plan... | [
{
"created": "Fri, 6 Mar 2015 09:35:08 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Apr 2015 10:11:37 GMT",
"version": "v2"
}
] | 2015-04-29 | [
[
"Casadio",
"Roberto",
""
],
[
"Micu",
"Octavian",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | We study the nature of the inner Cauchy horizon of a Reissner-Nordstr\"om black hole in a quantum context by means of the horizon wave-function obtained from modelling the electrically charged source as a Gaussian wave-function. Our main finding it that there is a significant range of black hole mass (around the Planck... |
2403.01490 | Gang Wang | Gang Wang | Time delay interferometry with minimal null frequencies | 14 pages, 10 figures, accepted for publication in PRD | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time delay interferometry (TDI) is a key technique employed in gravitational
wave (GW) space missions to mitigate laser frequency noise by combining
multiple laser links and establishing an equivalent equal arm interferometry.
The null frequencies will be introduced in noise spectra and GW response when
the periodica... | [
{
"created": "Sun, 3 Mar 2024 11:57:23 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2024 02:57:57 GMT",
"version": "v2"
}
] | 2024-06-26 | [
[
"Wang",
"Gang",
""
]
] | Time delay interferometry (TDI) is a key technique employed in gravitational wave (GW) space missions to mitigate laser frequency noise by combining multiple laser links and establishing an equivalent equal arm interferometry. The null frequencies will be introduced in noise spectra and GW response when the periodical ... |
0901.2362 | Sean Gryb B | Sean B. Gryb | Implementing Mach's Principle Using Gauge Theory | 31 pages, 3 figures. Clarifications added, figures and typos fixed,
journal-ref updated | Phys.Rev.D80:024018,2009 | 10.1103/PhysRevD.80.024018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reformulate an approach fist given by Barbour and Bertotti (BB) for
implementing Mach's principle for nonrelativistic particles. This reformulation
can deal with arbitrary symmetry groups and finite group elements. Applying
these techniques to U(1) and SU(N) invariant scalar field theories, we show
that BB's propo... | [
{
"created": "Thu, 15 Jan 2009 22:26:03 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2009 15:30:37 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Gryb",
"Sean B.",
""
]
] | We reformulate an approach fist given by Barbour and Bertotti (BB) for implementing Mach's principle for nonrelativistic particles. This reformulation can deal with arbitrary symmetry groups and finite group elements. Applying these techniques to U(1) and SU(N) invariant scalar field theories, we show that BB's proposa... |
1412.3424 | Rafael Ferraro | Rafael Ferraro and Franco Fiorini | Remnant group of local Lorentz transformations in f(T) theories | 10 pages. Minor changes. To appear in PRD | Phys. Rev. D 91, 064019 (2015) | 10.1103/PhysRevD.91.064019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the extended teleparallel gravitational theories, known as
f(T) theories, inherit some on shell local Lorentz invariance associated with
the tetrad field defining the spacetime structure. We discuss some enlightening
examples, such as Minkowski spacetime and cosmological
(Friedmann-Robertson-Walker a... | [
{
"created": "Wed, 10 Dec 2014 19:38:24 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Dec 2014 19:49:01 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Feb 2015 14:14:21 GMT",
"version": "v3"
}
] | 2015-03-18 | [
[
"Ferraro",
"Rafael",
""
],
[
"Fiorini",
"Franco",
""
]
] | It is shown that the extended teleparallel gravitational theories, known as f(T) theories, inherit some on shell local Lorentz invariance associated with the tetrad field defining the spacetime structure. We discuss some enlightening examples, such as Minkowski spacetime and cosmological (Friedmann-Robertson-Walker and... |
gr-qc/9902039 | Ishwaree Prasad Neupane | Ishwaree P.Neupane | Planetary Perturbation with Cosmological Constant | 6 pages, RevTex, some corrections on gr-qc/9812096 | null | null | null | gr-qc | null | A contribution of quantum vacuum to the energy momentum tensor is inevitably
experienced in the present universe. One requires the presence of non-zero
cosmological constant ($\Lambda$) to make the various observations consistent.
A case of $\Lambda$ in the Schwarzschild de Sitter space-time shows that
precession of ... | [
{
"created": "Fri, 12 Feb 1999 05:52:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Neupane",
"Ishwaree P.",
""
]
] | A contribution of quantum vacuum to the energy momentum tensor is inevitably experienced in the present universe. One requires the presence of non-zero cosmological constant ($\Lambda$) to make the various observations consistent. A case of $\Lambda$ in the Schwarzschild de Sitter space-time shows that precession of pe... |
1007.4820 | Neil J. Cornish | Neil J. Cornish | Fast Fisher Matrices and Lazy Likelihoods | 4 pages. Simpler Implementation | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theoretical studies in gravitational wave astronomy often require the
calculation of Fisher Information Matrices and Likelihood functions, which in a
direct approach entail the costly step of computing gravitational waveforms.
Here I describe an alternative technique that sidesteps the need to compute
full waveforms,... | [
{
"created": "Tue, 27 Jul 2010 20:43:25 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 2010 19:51:54 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Feb 2013 19:53:45 GMT",
"version": "v3"
}
] | 2013-02-07 | [
[
"Cornish",
"Neil J.",
""
]
] | Theoretical studies in gravitational wave astronomy often require the calculation of Fisher Information Matrices and Likelihood functions, which in a direct approach entail the costly step of computing gravitational waveforms. Here I describe an alternative technique that sidesteps the need to compute full waveforms, r... |
2210.08718 | Chao Wang | Chao Wang, Bin Wu, Zhen Ming Xu, Wen Li Yang | Thermodynamic geometry of the RN-AdS black hole and non-local
observables | 13 oages, 7 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we show the relation between the thermodynamic geometry of a
four-dimensional Reissner-Nordstrom-AdS (RN-AdS) black hole and non-local
observables in boundary field theory. Instead of introducing the critical point
associating with the black hole charge to nondimensionalize the thermodynamics
parameter... | [
{
"created": "Mon, 17 Oct 2022 03:19:20 GMT",
"version": "v1"
}
] | 2022-10-18 | [
[
"Wang",
"Chao",
""
],
[
"Wu",
"Bin",
""
],
[
"Xu",
"Zhen Ming",
""
],
[
"Yang",
"Wen Li",
""
]
] | In this paper, we show the relation between the thermodynamic geometry of a four-dimensional Reissner-Nordstrom-AdS (RN-AdS) black hole and non-local observables in boundary field theory. Instead of introducing the critical point associating with the black hole charge to nondimensionalize the thermodynamics parameters,... |
gr-qc/0512119 | Mihalis Dafermos | Mihalis Dafermos and Igor Rodnianski | The red-shift effect and radiation decay on black hole spacetimes | 43 pages, 8 figures | Comm. Pure Appl. Math. 62 (2009), 859-919 | null | null | gr-qc math.AP | null | We consider solutions to the linear wave equation on a (maximally extended)
Schwarzschild spacetime, assuming only that the solution decays suitably at
spatial infinity on a complete Cauchy hypersurface. (In particular, we allow
the support of the solution to contain the bifurcate event horizon.) We prove
uniform dec... | [
{
"created": "Wed, 21 Dec 2005 00:02:40 GMT",
"version": "v1"
}
] | 2014-12-30 | [
[
"Dafermos",
"Mihalis",
""
],
[
"Rodnianski",
"Igor",
""
]
] | We consider solutions to the linear wave equation on a (maximally extended) Schwarzschild spacetime, assuming only that the solution decays suitably at spatial infinity on a complete Cauchy hypersurface. (In particular, we allow the support of the solution to contain the bifurcate event horizon.) We prove uniform decay... |
1406.5703 | Francisco Lobo | Mahdi Kord Zangeneh, Francisco S. N. Lobo, Nematollah Riazi | Higher-dimensional evolving wormholes satisfying the null energy
condition | 9 pages, 4 figures. V2: References added, minor corrections
(including in the Flamm discussion); to appear in PRD | Phys.Rev.D90:024072,2014 | 10.1103/PhysRevD.90.024072 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider the possibility of expanding wormholes in
higher-dimensions, which is an important ingredient of modern theories of
fundamental physics. An important motivation is that non-trivial topological
objects such as microscopic wormholes may have been enlarged to macroscopic
sizes in an expanding i... | [
{
"created": "Sun, 22 Jun 2014 11:12:22 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2014 15:07:34 GMT",
"version": "v2"
}
] | 2014-07-30 | [
[
"Zangeneh",
"Mahdi Kord",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Riazi",
"Nematollah",
""
]
] | In this work, we consider the possibility of expanding wormholes in higher-dimensions, which is an important ingredient of modern theories of fundamental physics. An important motivation is that non-trivial topological objects such as microscopic wormholes may have been enlarged to macroscopic sizes in an expanding inf... |
1910.00284 | Luis Herrera | L: Herrera | Causal heat conduction contravening the fading memory paradigm | 22 pages Latex. Published in the special issue of Entropy: Entropy
generation and heat transfer II | Entropy 21, 950, (2019) | null | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a causal heat conduction model based on a heat kernel violating
the fading memory paradigm. The resulting transport equation produces an
equation for the temperature. The model is applied to the discussion of two
important issues such as the thermohaline convection and the nuclear burning
(in)stability. In... | [
{
"created": "Tue, 1 Oct 2019 10:00:27 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"L",
"",
""
],
[
":",
"",
""
],
[
"Herrera",
"",
""
]
] | We propose a causal heat conduction model based on a heat kernel violating the fading memory paradigm. The resulting transport equation produces an equation for the temperature. The model is applied to the discussion of two important issues such as the thermohaline convection and the nuclear burning (in)stability. In b... |
2111.08407 | Jan Henryk Kwapisz | Jan Chojnacki, Jan Henryk Kwapisz | Finite Action Principle and wormholes | Contribution to the Proceedings of the Sixteenth Marcel Grossmann
Meeting (MG16), July 5-10, 2021 based on a invited parallel talk(s) in the
Horava-Lifshitz Gravity session | null | 10.1142/9789811269776_0082 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we elaborate on the finite action for wormholes in higher
derivative theories. Both non-traversable and traversable wormholes in theories
with higher curvature invariants posses finite action.
| [
{
"created": "Tue, 16 Nov 2021 12:13:44 GMT",
"version": "v1"
}
] | 2023-01-27 | [
[
"Chojnacki",
"Jan",
""
],
[
"Kwapisz",
"Jan Henryk",
""
]
] | In this work, we elaborate on the finite action for wormholes in higher derivative theories. Both non-traversable and traversable wormholes in theories with higher curvature invariants posses finite action. |
2003.00564 | Jeferson de Oliveira | B. Cuadros-Melgar, R. D. B. Fontana, Jeferson de Oliveira | Late-time tails, entropy aspects, and stability of black holes with
anisotropic fluids | 23 pages, 4 figures | The European Physical Journal C volume 80, Article number: 848
(2020) | 10.1140/epjc/s10052-020-8415-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider black holes surrounded by anisotropic fluids in four
dimensions. We first study the causal structure of these solutions showing some
similarities and differences with Reissner-Nordstr\"om-de Sitter black holes.
In addition, we consider scalar perturbations on this background geometry and
comp... | [
{
"created": "Sun, 1 Mar 2020 19:23:24 GMT",
"version": "v1"
}
] | 2020-11-20 | [
[
"Cuadros-Melgar",
"B.",
""
],
[
"Fontana",
"R. D. B.",
""
],
[
"de Oliveira",
"Jeferson",
""
]
] | In this work we consider black holes surrounded by anisotropic fluids in four dimensions. We first study the causal structure of these solutions showing some similarities and differences with Reissner-Nordstr\"om-de Sitter black holes. In addition, we consider scalar perturbations on this background geometry and comput... |
2206.04366 | Marica Minucci | Marica Minucci, Rodrigo Panosso Macedo and Juan Antonio Valiente Kroon | The Maxwell-scalar field system near spatial infinity | null | null | 10.1063/5.0104602 | null | gr-qc math.AP | http://creativecommons.org/licenses/by/4.0/ | We make use of Friedrich's representation of spatial infinity to study
asymptotic expansions of the Maxwell-scalar field system near spatial infinity.
The main objective of this analysis is to understand the effects of the
non-linearities of this system on the regularity of solutions and
polyhomogeneous expansions at... | [
{
"created": "Thu, 9 Jun 2022 09:22:16 GMT",
"version": "v1"
}
] | 2022-09-14 | [
[
"Minucci",
"Marica",
""
],
[
"Macedo",
"Rodrigo Panosso",
""
],
[
"Kroon",
"Juan Antonio Valiente",
""
]
] | We make use of Friedrich's representation of spatial infinity to study asymptotic expansions of the Maxwell-scalar field system near spatial infinity. The main objective of this analysis is to understand the effects of the non-linearities of this system on the regularity of solutions and polyhomogeneous expansions at n... |
gr-qc/9608064 | Jorge Pullin | John Baker, Andrew Abrahams, Peter Anninos, Steve Brandt, Richard
Price, Jorge Pullin, Edward Seidel | The collision of boosted black holes | 8 pages, RevTeX, 3 figures included with epsf | Phys.Rev. D55 (1997) 829-834 | 10.1103/PhysRevD.55.829 | CGQG-96/8-3 | gr-qc | null | We study the radiation from a collision of black holes with equal and
opposite linear momenta. Results are presented from a full numerical relativity
treatment and are compared with the results from a ``close-slow''
approximation. The agreement is remarkable, and suggests several insights about
the generation of grav... | [
{
"created": "Wed, 28 Aug 1996 01:44:51 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Baker",
"John",
""
],
[
"Abrahams",
"Andrew",
""
],
[
"Anninos",
"Peter",
""
],
[
"Brandt",
"Steve",
""
],
[
"Price",
"Richard",
""
],
[
"Pullin",
"Jorge",
""
],
[
"Seidel",
"Edward",
""
]
] | We study the radiation from a collision of black holes with equal and opposite linear momenta. Results are presented from a full numerical relativity treatment and are compared with the results from a ``close-slow'' approximation. The agreement is remarkable, and suggests several insights about the generation of gravit... |
2109.06104 | Kristina Giesel | Kristina Giesel and Almut Vetter | Coherent states for fractional powers of the harmonic oscillator
Hamiltonian | 36 pages | Universe 2021, 7, 442 | 10.3390/universe7110442 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by special and general relativistic systems that can have
Hamiltonians involving square roots, or more general fractional powers, in this
article we address the question how a suitable set of coherent states for such
systems can be obtained. This becomes a relevant topic if the semiclassical
sector of a give... | [
{
"created": "Mon, 13 Sep 2021 16:25:49 GMT",
"version": "v1"
}
] | 2021-11-18 | [
[
"Giesel",
"Kristina",
""
],
[
"Vetter",
"Almut",
""
]
] | Inspired by special and general relativistic systems that can have Hamiltonians involving square roots, or more general fractional powers, in this article we address the question how a suitable set of coherent states for such systems can be obtained. This becomes a relevant topic if the semiclassical sector of a given ... |
0709.4414 | Valerio Faraoni | Nicolas Lanahan-Tremblay and Valerio Faraoni (Bishop's University) | The Cauchy problem of f(R) gravity | 16 latex pages, to appear in Class. Quantum Grav; typographical
errors corrected, new references added | Class.Quant.Grav.24:5667-5680,2007 | 10.1088/0264-9381/24/22/024 | null | gr-qc astro-ph hep-th | null | The initial value problem of metric and Palatini f(R)gravity is studied by
using the dynamical equivalence between these theories and Brans-Dicke gravity.
The Cauchy problem is well-formulated for metric f(R)gravity in the presence of
matter and well-posed in vacuo. For Palatini f(R)gravity, instead, the Cauchy
probl... | [
{
"created": "Thu, 27 Sep 2007 14:56:46 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Oct 2007 15:01:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lanahan-Tremblay",
"Nicolas",
"",
"Bishop's University"
],
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | The initial value problem of metric and Palatini f(R)gravity is studied by using the dynamical equivalence between these theories and Brans-Dicke gravity. The Cauchy problem is well-formulated for metric f(R)gravity in the presence of matter and well-posed in vacuo. For Palatini f(R)gravity, instead, the Cauchy problem... |
2311.03556 | Akash Kumar Mishra | Akash K Mishra, Gregorio Carullo, Sumanta Chakraborty | Bounds on tidal charges from gravitational-wave ringdown observations | 15 pages, 4 figures, 1 table, Matches published version | Phys. Rev. D 109, 024025 (2024) | 10.1103/PhysRevD.109.024025 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole solutions in the braneworld scenario are predicted to possess a
tidal charge parameter, leaving imprints in the quasinormal spectrum. We
conduct an extensive computation of such spectrum, and use it to construct a
waveform model for the ringdown relaxation regime of binary black hole mergers
observed by LI... | [
{
"created": "Mon, 6 Nov 2023 21:48:46 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2024 11:14:55 GMT",
"version": "v2"
}
] | 2024-04-18 | [
[
"Mishra",
"Akash K",
""
],
[
"Carullo",
"Gregorio",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | Black hole solutions in the braneworld scenario are predicted to possess a tidal charge parameter, leaving imprints in the quasinormal spectrum. We conduct an extensive computation of such spectrum, and use it to construct a waveform model for the ringdown relaxation regime of binary black hole mergers observed by LIGO... |
1611.08251 | Olga Babourova Valer'evna | O.V. Babourova, B.N. Frolov, P.E. Kudlaev | Approximate axially symmetric solution of the Weyl-Dirac theory of
gravitation and the spiral galactic rotation problem | 6 pages, no figures, typos added,added references for section 3 | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of the Poincare-Weyl gauge theory of gravitation, a new
conformal Weyl-Dirac theory of gravitation is proposed, which is a
gravitational theory in Cartan-Weyl spacetime with the Dirac scalar field
representing the dark matter model. A static approximate axially symmetric
solution of the field equations i... | [
{
"created": "Thu, 24 Nov 2016 16:54:57 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2017 18:13:53 GMT",
"version": "v2"
}
] | 2017-07-17 | [
[
"Babourova",
"O. V.",
""
],
[
"Frolov",
"B. N.",
""
],
[
"Kudlaev",
"P. E.",
""
]
] | On the basis of the Poincare-Weyl gauge theory of gravitation, a new conformal Weyl-Dirac theory of gravitation is proposed, which is a gravitational theory in Cartan-Weyl spacetime with the Dirac scalar field representing the dark matter model. A static approximate axially symmetric solution of the field equations in ... |
1605.00820 | Soumya Jana | Soumya Jana, Sayan Kar (IIT Kharagpur, India) | Born-Infeld cosmology with scalar Born-Infeld matter | 24 pages, 8 figures. Published version | Phys. Rev. D 94, 064016 (2016) | 10.1103/PhysRevD.94.064016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmology in Eddington-inspired Born-Infeld gravity is investigated using a
scalar Born-Infeld field (e.g. tachyon condensate) as matter. In this way, both
in the gravity and matter sectors we have Born-Infeld-like structures
characterized by their actions and via two separate constants, $\kappa$ and
$\alpha_T^2$ res... | [
{
"created": "Tue, 3 May 2016 10:04:06 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2016 07:05:42 GMT",
"version": "v2"
}
] | 2016-09-27 | [
[
"Jana",
"Soumya",
"",
"IIT Kharagpur, India"
],
[
"Kar",
"Sayan",
"",
"IIT Kharagpur, India"
]
] | Cosmology in Eddington-inspired Born-Infeld gravity is investigated using a scalar Born-Infeld field (e.g. tachyon condensate) as matter. In this way, both in the gravity and matter sectors we have Born-Infeld-like structures characterized by their actions and via two separate constants, $\kappa$ and $\alpha_T^2$ respe... |
0711.0686 | Saibal Ray | Saibal Ray, Maxim Khlopov, Utpal Mukhopadhyay and Partha Pratim Ghosh | Phenomenology of $\Lambda$-CDM model: a possibility of accelerating
Universe with positive pressure | 16 Latex pages, 11 figures, Considerable modifications in the text;
Accepted in IJTP | Int.J.Theor.Phys.50:939-951,2011 | 10.1007/s10773-010-0639-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among various phenomenological $\Lambda$ models, a time-dependent model $\dot
\Lambda\sim H^3$ is selected here to investigate the $\Lambda$-CDM cosmology.
Using this model the expressions for the time-dependent equation of state
parameter $\omega$ and other physical parameters are derived. It is shown that
in $H^3$ ... | [
{
"created": "Mon, 5 Nov 2007 16:42:51 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jul 2010 07:40:08 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Dec 2010 07:00:31 GMT",
"version": "v3"
}
] | 2011-01-25 | [
[
"Ray",
"Saibal",
""
],
[
"Khlopov",
"Maxim",
""
],
[
"Mukhopadhyay",
"Utpal",
""
],
[
"Ghosh",
"Partha Pratim",
""
]
] | Among various phenomenological $\Lambda$ models, a time-dependent model $\dot \Lambda\sim H^3$ is selected here to investigate the $\Lambda$-CDM cosmology. Using this model the expressions for the time-dependent equation of state parameter $\omega$ and other physical parameters are derived. It is shown that in $H^3$ mo... |
1506.03814 | T. Padmanabhan | T. Padmanabhan | Momentum density of spacetime and the gravitational dynamics | six pages; no figures | null | 10.1007/s10714-015-1996-z | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I introduce a covariant four-vector $\mathcal{G}^a[v]$, which can be
interpreted as the momentum density attributed to the spacetime geometry by an
observer with velocity $v^a$, and describe its properties: (a) Demanding that
the total momentum of matter plus geometry is conserved for all observers,
leads to the grav... | [
{
"created": "Thu, 11 Jun 2015 20:00:36 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Padmanabhan",
"T.",
""
]
] | I introduce a covariant four-vector $\mathcal{G}^a[v]$, which can be interpreted as the momentum density attributed to the spacetime geometry by an observer with velocity $v^a$, and describe its properties: (a) Demanding that the total momentum of matter plus geometry is conserved for all observers, leads to the gravit... |
gr-qc/9406039 | Jorge Griego | C. Di Bartolo, R. Gambini and J. Griego | The Extended Loop Representation of Quantum Gravity | 27 pages, report IFFC/94-13 | Phys.Rev. D51 (1995) 502-516 | 10.1103/PhysRevD.51.502 | null | gr-qc | null | A new representation of Quantum Gravity is developed. This formulation is
based on an extension of the group of loops. The enlarged group, that we call
the Extended Loop Group, behaves locally as an infinite dimensional Lie group.
Quantum Gravity can be realized on the state space of extended loop dependent
wavefunct... | [
{
"created": "Wed, 22 Jun 1994 19:26:27 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Di Bartolo",
"C.",
""
],
[
"Gambini",
"R.",
""
],
[
"Griego",
"J.",
""
]
] | A new representation of Quantum Gravity is developed. This formulation is based on an extension of the group of loops. The enlarged group, that we call the Extended Loop Group, behaves locally as an infinite dimensional Lie group. Quantum Gravity can be realized on the state space of extended loop dependent wavefunctio... |
1405.1922 | Miroslav Shaltev | Miroslav Shaltev, Paola Leaci, Maria Alessandra Papa, Reinhard Prix | Fully coherent follow-up of continuous gravitational-wave candidates: an
application to Einstein@Home results | 8 pages, 3 figures, 3 tables | Phys. Rev. D 89, 124030 (2014) | 10.1103/PhysRevD.89.124030 | LIGO-P1400057-v2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We characterize and present the details of the follow-up method used on the
most significant outliers of the Hough Einstein@Home all-sky search for
continuous gravitational waves arXiv:1207.7176. This follow-up method is based
on the two-stage approach introduced in arXiv:1303.2471, consisting of a
semicoherent refin... | [
{
"created": "Thu, 8 May 2014 13:41:16 GMT",
"version": "v1"
}
] | 2014-07-02 | [
[
"Shaltev",
"Miroslav",
""
],
[
"Leaci",
"Paola",
""
],
[
"Papa",
"Maria Alessandra",
""
],
[
"Prix",
"Reinhard",
""
]
] | We characterize and present the details of the follow-up method used on the most significant outliers of the Hough Einstein@Home all-sky search for continuous gravitational waves arXiv:1207.7176. This follow-up method is based on the two-stage approach introduced in arXiv:1303.2471, consisting of a semicoherent refinem... |
1809.03879 | Giorgos Manolakos | D. Jurman, G. Manolakos, P. Manousselis, G. Zoupanos | Gravity as a Gauge Theory on Three-Dimensional Noncommutative spaces | arXiv admin note: text overlap with arXiv:1802.07550 | null | 10.22323/1.318.0162 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We plan to translate the successful description of three-dimensional gravity
as a gauge theory in the noncommutative framework, making use of the covariant
coordinates. We consider two specific three-dimensional fuzzy spaces based on
SU(2) and SU(1,1), which carry appropriate symmetry groups. These are the
groups we ... | [
{
"created": "Sun, 9 Sep 2018 10:46:55 GMT",
"version": "v1"
}
] | 2018-09-12 | [
[
"Jurman",
"D.",
""
],
[
"Manolakos",
"G.",
""
],
[
"Manousselis",
"P.",
""
],
[
"Zoupanos",
"G.",
""
]
] | We plan to translate the successful description of three-dimensional gravity as a gauge theory in the noncommutative framework, making use of the covariant coordinates. We consider two specific three-dimensional fuzzy spaces based on SU(2) and SU(1,1), which carry appropriate symmetry groups. These are the groups we ar... |
gr-qc/0601063 | Friedrich W. Hehl | Peter Baekler and Friedrich W. Hehl | Rotating Black Holes in Metric-Affine Gravity | 32 pages latex, 3 tables | Int.J.Mod.Phys.D15:635-668,2006 | 10.1142/S0218271806008589 | null | gr-qc hep-th | null | Within the framework of metric-affine gravity (MAG, metric and an independent
linear connection constitute spacetime), we find, for a specific gravitational
Lagrangian and by using {\it prolongation} techniques, a stationary axially
symmetric exact solution of the vacuum field equations. This black hole
solution embo... | [
{
"created": "Mon, 16 Jan 2006 21:50:58 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Baekler",
"Peter",
""
],
[
"Hehl",
"Friedrich W.",
""
]
] | Within the framework of metric-affine gravity (MAG, metric and an independent linear connection constitute spacetime), we find, for a specific gravitational Lagrangian and by using {\it prolongation} techniques, a stationary axially symmetric exact solution of the vacuum field equations. This black hole solution embodi... |
0710.2568 | Yun Soo Myung | Yun Soo Myung | Phase transition between non-extremal and extremal Reissner-Nordstr\"om
black holes | 12 pages, 6 figures, version to appear in MPLA | Mod.Phys.Lett.A23:667-676,2008 | 10.1142/S0217732308026741 | INJE-TP-07-10 | gr-qc | null | We discuss the phase transition between non-extremal and extremal
Reissner-Nordstr\"om black holes. This transition is considered as the
$T \to 0$ limit of the transition between the non-extremal and near-extremal
black holes.
We show that an evaporating process from non-extremal black hole to extremal
one is pos... | [
{
"created": "Fri, 12 Oct 2007 23:46:43 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2007 07:38:13 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Mar 2008 23:47:42 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Myung",
"Yun Soo",
""
]
] | We discuss the phase transition between non-extremal and extremal Reissner-Nordstr\"om black holes. This transition is considered as the $T \to 0$ limit of the transition between the non-extremal and near-extremal black holes. We show that an evaporating process from non-extremal black hole to extremal one is possible ... |
gr-qc/9409012 | null | A. Lukas | The No-Boundary Wave Function and the Duration of the Inflationary
Period | 11 pages, TUM-HEP-206/94, 2 figures (added as uu-encoded postscript
file) | Phys.Lett.B347:13-20,1995 | 10.1016/0370-2693(94)01693-7 | null | gr-qc | null | For the simplest minisuperspace model based on a homogeneous, isotropic
metric and a minimally coupled scalar field we derive analytic expressions for
the caustic which separates Euklidean and Minkowskian region and its breakdown
value $\p_*$. This value represents the prediction of the no-boundary wave
function for ... | [
{
"created": "Wed, 7 Sep 1994 14:13:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lukas",
"A.",
""
]
] | For the simplest minisuperspace model based on a homogeneous, isotropic metric and a minimally coupled scalar field we derive analytic expressions for the caustic which separates Euklidean and Minkowskian region and its breakdown value $\p_*$. This value represents the prediction of the no-boundary wave function for th... |
1408.4283 | Andrea Geralico | Donato Bini, Fernando de Felice, Andrea Geralico | Strains in General Relativity | 25 pages, 7 figures; published version | Class. Quantum Grav. 23, 7603 (2006) | 10.1088/0264-9381/23/24/028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definition of relative accelerations and strains among a set of comoving
particles is studied in connection with the geometric properties of the frame
adapted to a "fiducial observer." We find that a relativistically complete and
correct definition of strains must take into account the transport law of the
chosen... | [
{
"created": "Tue, 19 Aug 2014 10:30:02 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"de Felice",
"Fernando",
""
],
[
"Geralico",
"Andrea",
""
]
] | The definition of relative accelerations and strains among a set of comoving particles is studied in connection with the geometric properties of the frame adapted to a "fiducial observer." We find that a relativistically complete and correct definition of strains must take into account the transport law of the chosen s... |
1004.3291 | Dejan Stojkovic | De-Chang Dai and Dejan Stojkovic | Analytic solution for a static black hole in RSII model | extended discussion, appendix added, published in Phys. Lett. B | Phys.Lett. B704 (2011) 354-359 | 10.1016/j.physletb.2011.09.038 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present here a static solution for a large black hole (whose horizon
radius is larger than the AdS radius) located on the brane in RSII model.
According to some arguments based on the AdS/CFT conjecture, a solution for the
black hole located on the brane in RSII model must encode quantum gravitational
effects and ... | [
{
"created": "Mon, 19 Apr 2010 20:02:03 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2011 14:47:07 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Dai",
"De-Chang",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | We present here a static solution for a large black hole (whose horizon radius is larger than the AdS radius) located on the brane in RSII model. According to some arguments based on the AdS/CFT conjecture, a solution for the black hole located on the brane in RSII model must encode quantum gravitational effects and th... |
1104.3126 | Eric G. Brown | Eric G. Brown, Robert B. Mann, Leonardo Modesto | Mass Inflation in the Loop Black Hole | Latex 20 pages, 7 figures | null | 10.1103/PhysRevD.84.104041 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In classical general relativity the Cauchy horizon within a two-horizon black
hole is unstable via a phenomenon known as mass inflation, in which the mass
parameter (and the spacetime curvature) of the black hole diverges at the
Cauchy horizon. Here we study this effect for loop black holes -- quantum
gravitationally... | [
{
"created": "Fri, 15 Apr 2011 19:05:26 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Brown",
"Eric G.",
""
],
[
"Mann",
"Robert B.",
""
],
[
"Modesto",
"Leonardo",
""
]
] | In classical general relativity the Cauchy horizon within a two-horizon black hole is unstable via a phenomenon known as mass inflation, in which the mass parameter (and the spacetime curvature) of the black hole diverges at the Cauchy horizon. Here we study this effect for loop black holes -- quantum gravitationally c... |
gr-qc/0506103 | Ishwaree Neupane | Benedict M.N. Carter and Ishwaree P Neupane | Thermodynamics and Stability of Higher Dimensional Rotating (Kerr) AdS
Black Holes | 15 pages, 23 eps figures, RevTex4 | Phys.Rev.D72:043534,2005 | 10.1103/PhysRevD.72.043534 | null | gr-qc hep-th | null | We study the thermodynamic and gravitational stability of Kerr anti-de Sitter
black holes in five and higher dimensions. We show, in the case of equal
rotation parameters, $a_i=a$, that the Kerr-AdS background metrics become
stable, both thermodynamically and gravitationally, when the rotation
parameters $a_i$ take v... | [
{
"created": "Tue, 21 Jun 2005 07:04:48 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jul 2005 07:34:44 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jul 2005 12:04:22 GMT",
"version": "v3"
},
{
"created": "Fri, 2 Sep 2005 07:14:45 GMT",
"version": "v4"
}
] | 2010-11-19 | [
[
"Carter",
"Benedict M. N.",
""
],
[
"Neupane",
"Ishwaree P",
""
]
] | We study the thermodynamic and gravitational stability of Kerr anti-de Sitter black holes in five and higher dimensions. We show, in the case of equal rotation parameters, $a_i=a$, that the Kerr-AdS background metrics become stable, both thermodynamically and gravitationally, when the rotation parameters $a_i$ take val... |
gr-qc/0406057 | Claudio Benedito Silva Furtado | L.C. Garcia de Andrade, A. M. de M. Carvalho and C. Furtado | Geometric Phase for Fermionic Quasiparticles Scattering by Disgyration
in Superfluids | 7 pages, to appear in Europhys. Lett | Europhys.Lett.67:538-544,2004 | 10.1209/epl/i2004-10096-6 | null | gr-qc | null | We consider a Volovik's analog model for description of a topological defects
in a superfluid and we investigate the scattering of quasiparticles in this
background. The analog of the gravitational Aharonov-Bohm in this system is
found. An analysis of this problem employing loop variables is considered and
corroborat... | [
{
"created": "Mon, 14 Jun 2004 17:33:20 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"de Andrade",
"L. C. Garcia",
""
],
[
"Carvalho",
"A. M. de M.",
""
],
[
"Furtado",
"C.",
""
]
] | We consider a Volovik's analog model for description of a topological defects in a superfluid and we investigate the scattering of quasiparticles in this background. The analog of the gravitational Aharonov-Bohm in this system is found. An analysis of this problem employing loop variables is considered and corroborates... |
1210.5870 | David Kofro\v{n} | Ji\v{r}\'i Bi\v{c}\'ak and David Kofro\v{n} | Variations on spacetimes with boost-rotation symmetry | 4 pages, 3 figures; Contribution to the proceedings of "Relativity
and Gravitation - 100 years after Einstein in Prague" (Prague, June 25-29,
2012) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some new results on the boost-rotation symmetric spacetimes representing
pairs of rotating charged objects accelerated in opposite directions are
summarized. A particular attention is paid to (a) the Newtonian limit analyzed
using the Ehlers frame theory and (b) the special-relativistic limit of the
C-metric. Startin... | [
{
"created": "Mon, 22 Oct 2012 11:11:01 GMT",
"version": "v1"
}
] | 2012-10-23 | [
[
"Bičák",
"Jiří",
""
],
[
"Kofroň",
"David",
""
]
] | Some new results on the boost-rotation symmetric spacetimes representing pairs of rotating charged objects accelerated in opposite directions are summarized. A particular attention is paid to (a) the Newtonian limit analyzed using the Ehlers frame theory and (b) the special-relativistic limit of the C-metric. Starting ... |
1308.5403 | Brian Dolan | Brian P. Dolan | The compressibility of rotating black holes in D-dimensions | 14 pages, 2 figures; discussion of extensive/intensive thermodynamic
variables added, and minor typos corrected, in v2 | null | 10.1088/0264-9381/31/3/035022 | DIAS-STP-13-08 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Treating the cosmological constant as a pressure, in the context of black
hole thermodynamics, a thermodynamic volume for the black hole can be defined
as being the thermodynamic variable conjugate to the pressure, in the sense of
a Legendre transform. The thermodynamic volume is explicitly calculated, as the
Legendr... | [
{
"created": "Sun, 25 Aug 2013 12:54:55 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2013 15:16:58 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Dolan",
"Brian P.",
""
]
] | Treating the cosmological constant as a pressure, in the context of black hole thermodynamics, a thermodynamic volume for the black hole can be defined as being the thermodynamic variable conjugate to the pressure, in the sense of a Legendre transform. The thermodynamic volume is explicitly calculated, as the Legendre ... |
0910.1181 | Nikodem Poplawski | Nikodem J. Poplawski | Nonsingular Dirac particles in spacetime with torsion | 8 pages; published version | Phys.Lett.B690:73-77,2010; Erratum-ibid.B727:575,2013 | 10.1016/j.physletb.2010.04.073 10.1016/j.physletb.2013.11.005 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the Papapetrou method of multipole expansion to show that a Dirac
field in the Einstein-Cartan-Kibble-Sciama (ECKS) theory of gravity cannot form
singular configurations concentrated on one- or two-dimensional surfaces in
spacetime. Instead, such a field describes a nonsingular particle whose spatial
dimension... | [
{
"created": "Wed, 7 Oct 2009 08:12:03 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 2010 14:59:41 GMT",
"version": "v2"
}
] | 2013-12-03 | [
[
"Poplawski",
"Nikodem J.",
""
]
] | We use the Papapetrou method of multipole expansion to show that a Dirac field in the Einstein-Cartan-Kibble-Sciama (ECKS) theory of gravity cannot form singular configurations concentrated on one- or two-dimensional surfaces in spacetime. Instead, such a field describes a nonsingular particle whose spatial dimension i... |
2101.00665 | Vasilis Oikonomou | V.K. Oikonomou | Non-minimally Coupled Scalar $k$-Inflation Dynamics | Invited publication for the EPJP special issue Modified Gravity
Theories and Cosmology | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we shall study $k$-inflation theories with non-minimal coupling
of the scalar field to gravity, in the presence of only a higher order kinetic
term of the form $\sim \mathrm{const}\times X^{\mu}$, with
$X=\frac{1}{2}\partial_{\mu}\phi\partial^{\mu}\phi$. The study will be focused
in the cases where a sca... | [
{
"created": "Sun, 3 Jan 2021 16:44:45 GMT",
"version": "v1"
}
] | 2021-01-05 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this work we shall study $k$-inflation theories with non-minimal coupling of the scalar field to gravity, in the presence of only a higher order kinetic term of the form $\sim \mathrm{const}\times X^{\mu}$, with $X=\frac{1}{2}\partial_{\mu}\phi\partial^{\mu}\phi$. The study will be focused in the cases where a scala... |
gr-qc/0701108 | Plamen Fiziev | P P Fiziev | Static Fundamental Solutions of Einstein Equations and Superposition
Principle in Relativistic Gravityv | Talk, given at the Conference Gravity, Astrophysics and Strings at
Black Sea, Kiten, Bulgaria 2005. 40 pages, 6 figures, latex file | Gravity, Astrophysics and Strings'05, St. Kliment Ohridski
University Press, pp. 202-241, Sofia, 2006 | null | SU-TH0605 | gr-qc | null | We show that Einstein equations are compatible with the presence of massive
point particle idealization and find the corresponding two parameter family of
solutions. They are complete defined by the bare mechanical mass $M>0$ and the
Keplerian mass $m>0$ ($m < M$) of the point source of gravity. The global
analytical... | [
{
"created": "Fri, 19 Jan 2007 13:11:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fiziev",
"P P",
""
]
] | We show that Einstein equations are compatible with the presence of massive point particle idealization and find the corresponding two parameter family of solutions. They are complete defined by the bare mechanical mass $M>0$ and the Keplerian mass $m>0$ ($m < M$) of the point source of gravity. The global analytical p... |
gr-qc/9712071 | Marcelo Jose Reboucas | M.J. Reboucas and A.F.F. Teixeira | Riemannian Space-times of G\"odel Type in Five Dimensions | 26 pages. LaTeX file. To appear in J. Math. Phys. (1998) | J.Math.Phys. 39 (1998) 2180-2192 | 10.1063/1.532281 | CBPF-NF-048/97 | gr-qc astro-ph | null | The five-dimensional (5D) Riemannian G\"odel-type manifolds are examined in
light of the equivalence problem techniques, as formulated by Cartan. The
necessary and sufficient conditions for local homogeneity of these 5D manifolds
are derived. The local equivalence of these homogeneous Riemannian manifolds is
studied.... | [
{
"created": "Tue, 16 Dec 1997 22:31:48 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Reboucas",
"M. J.",
""
],
[
"Teixeira",
"A. F. F.",
""
]
] | The five-dimensional (5D) Riemannian G\"odel-type manifolds are examined in light of the equivalence problem techniques, as formulated by Cartan. The necessary and sufficient conditions for local homogeneity of these 5D manifolds are derived. The local equivalence of these homogeneous Riemannian manifolds is studied. I... |
2312.17724 | Jia-Hui Huang | Jing-Peng Ye, Zhi-Qing He, Ai-Xu Zhou, Zi-Yang Huang and Jia-Hui Huang | Shadows and photon rings of a quantum black hole | references added,one figure added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Recently, a black hole model in loop quantum gravity has been proposed by
Lewandowski, Ma, Yang and Zhang (Phys. Rev. Lett. \textbf{130}, 101501 (2023)).
The metric tensor of the quantum black hole (QBH) is a suitably modified
Schwarzschild one. In this paper, we calculate the radius of light ring and
obtain the line... | [
{
"created": "Fri, 29 Dec 2023 18:23:38 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jan 2024 01:45:42 GMT",
"version": "v2"
}
] | 2024-01-30 | [
[
"Ye",
"Jing-Peng",
""
],
[
"He",
"Zhi-Qing",
""
],
[
"Zhou",
"Ai-Xu",
""
],
[
"Huang",
"Zi-Yang",
""
],
[
"Huang",
"Jia-Hui",
""
]
] | Recently, a black hole model in loop quantum gravity has been proposed by Lewandowski, Ma, Yang and Zhang (Phys. Rev. Lett. \textbf{130}, 101501 (2023)). The metric tensor of the quantum black hole (QBH) is a suitably modified Schwarzschild one. In this paper, we calculate the radius of light ring and obtain the linear... |
1008.5006 | Emil Mottola | Emil Mottola | New Horizons in Gravity: The Trace Anomaly, Dark Energy and Condensate
Stars | Lectures given at the at the XLIX Krakow School. This review article
is pedagogical in style, and wide ranging in scope, collecting and presenting
a broad spectrum of results on black holes, the trace anomaly, and quantum
effects in cosmology. 127 pages, 13 figures. In press | Acta Physica Polonica B (2010) Vol.41, iss.9, p.2031-2162 | null | LA-UR 10-04531; CERN-PH-TH 2010-158 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity receives quantum corrections relevant at macroscopic
distance scales and near event horizons. These arise from the conformal scalar
degrees of freedom in the extended effective field theory of gravity generated
by the trace anomaly of massless quantum fields in curved space. The origin of
these con... | [
{
"created": "Mon, 30 Aug 2010 05:23:49 GMT",
"version": "v1"
}
] | 2012-09-25 | [
[
"Mottola",
"Emil",
""
]
] | General Relativity receives quantum corrections relevant at macroscopic distance scales and near event horizons. These arise from the conformal scalar degrees of freedom in the extended effective field theory of gravity generated by the trace anomaly of massless quantum fields in curved space. The origin of these confo... |
2104.14100 | Tuan Do | Tuan Q. Do, W. F. Kao | Anisotropic power-law inflation for a model of two scalar and two vector
fields | 13 pages, 2 figures. Updated version, in which several typos are
corrected and one reference is added. All results are not changed. Matches
the published version. Comments are welcome | Eur. Phys. J. C 81, 525 (2021) | 10.1140/epjc/s10052-021-09334-y | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by an interesting counterexample to the cosmic no-hair conjecture
found in a supergravity-motivated model recently, we propose a multi-field
extension, in which two scalar fields are allowed to non-minimally couple to
two vector fields, respectively. This model is shown to admit an exact Bianchi
type I power... | [
{
"created": "Thu, 29 Apr 2021 04:31:55 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2021 15:38:46 GMT",
"version": "v2"
}
] | 2021-06-22 | [
[
"Do",
"Tuan Q.",
""
],
[
"Kao",
"W. F.",
""
]
] | Inspired by an interesting counterexample to the cosmic no-hair conjecture found in a supergravity-motivated model recently, we propose a multi-field extension, in which two scalar fields are allowed to non-minimally couple to two vector fields, respectively. This model is shown to admit an exact Bianchi type I power-l... |
2206.10398 | Roldao da Rocha | R. Casadio, R. da Rocha, P. Meert, L. Tabarroni, W. Barreto | Configurational entropy of black hole quantum cores | 14 pages, 4 figures, improved version | Class. Quantum Grav. 40 (2023) 075014 | 10.1088/1361-6382/acbe89 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two types of information entropy are studied for the quantum states of a
model for the matter core inside a black hole geometry. A detailed description
is first given of the quantum mechanical picture leading to a spectrum of bound
states for a collapsing ball of dust in general relativity with a non-trivial
ground s... | [
{
"created": "Tue, 21 Jun 2022 13:43:47 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2022 14:44:22 GMT",
"version": "v2"
}
] | 2023-03-15 | [
[
"Casadio",
"R.",
""
],
[
"da Rocha",
"R.",
""
],
[
"Meert",
"P.",
""
],
[
"Tabarroni",
"L.",
""
],
[
"Barreto",
"W.",
""
]
] | Two types of information entropy are studied for the quantum states of a model for the matter core inside a black hole geometry. A detailed description is first given of the quantum mechanical picture leading to a spectrum of bound states for a collapsing ball of dust in general relativity with a non-trivial ground sta... |
0708.0170 | Volker Perlick | Volker Perlick | On the radar method in general-relativistic spacetimes | Written version of talk given at 359th WE Heraeus Seminar ``Lasers,
Clocks, and Drag-Free. New Technologies for Testing Relativistic Gravity in
Space.'' Bremen, 2005; to appear in H. Dittus, C. L{\"a}mmerzahl, S. G.
Turyshev (eds.): ``Lasers, Clocks, and Drag-Free Control. Exploration of
Relativistic Gravity in... | null | 10.1007/978-3-540-34377-6_5 | null | gr-qc | null | If a clock, mathematically modeled by a parametrized timelike curve in a
general-relativistic spacetime, is given, the radar method assigns a time and a
distance to every event which is sufficiently close to the clock. Several
geometric aspects of this method are reviewed and their physical interpretation
is discusse... | [
{
"created": "Wed, 1 Aug 2007 14:54:52 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Perlick",
"Volker",
""
]
] | If a clock, mathematically modeled by a parametrized timelike curve in a general-relativistic spacetime, is given, the radar method assigns a time and a distance to every event which is sufficiently close to the clock. Several geometric aspects of this method are reviewed and their physical interpretation is discussed. |
gr-qc/9605074 | Salman Habib | Tanmoy Bhattacharya, Salman Habib, and Emil Mottola (Los Alamos) | Comment on "Gravitationally Induced Neutrino-Oscillation Phases" | Plain LaTeX, 7 pages, no figures | Phys. Rev. D59 (1999) 067301 | 10.1103/PhysRevD.59.067301 | null | gr-qc astro-ph hep-ph quant-ph | null | We critically examine the recent claim (gr-qc/9603008) of a ``new effect'' of
gravitationally induced quantum mechanical phases in neutrino oscillations. A
straightforward exercise in the Schwarzschild coordinates appropriate to a
spherically symmetric non-rotating star shows that, although there is a general
relativ... | [
{
"created": "Mon, 3 Jun 1996 05:16:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bhattacharya",
"Tanmoy",
"",
"Los Alamos"
],
[
"Habib",
"Salman",
"",
"Los Alamos"
],
[
"Mottola",
"Emil",
"",
"Los Alamos"
]
] | We critically examine the recent claim (gr-qc/9603008) of a ``new effect'' of gravitationally induced quantum mechanical phases in neutrino oscillations. A straightforward exercise in the Schwarzschild coordinates appropriate to a spherically symmetric non-rotating star shows that, although there is a general relativis... |
gr-qc/9811028 | Leor Barack | Leor Barack | Late time dynamics of scalar perturbations outside black holes: II.
Schwarzschild geometry | 17 pages, 14 figures. Accepted for publication in Physical Review D | Phys.Rev. D59 (1999) 044017 | 10.1103/PhysRevD.59.044017 | null | gr-qc | null | We apply a new analytic scheme, developed in a preceding paper, in order to
calculate the late time behavior of scalar test fields evolving outside a
Schwarzschild black hole. The pattern of the late time decay at future null
infinity is found to be the same as in the shell toy-model studied in the
preceding paper. A... | [
{
"created": "Tue, 10 Nov 1998 10:19:25 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Barack",
"Leor",
""
]
] | We apply a new analytic scheme, developed in a preceding paper, in order to calculate the late time behavior of scalar test fields evolving outside a Schwarzschild black hole. The pattern of the late time decay at future null infinity is found to be the same as in the shell toy-model studied in the preceding paper. A s... |
gr-qc/9710139 | Robert Mann | H. Burton, R.B. Mann | Palatini Variational Principle for $N$-Dimensional Dilaton Gravity | 16 pages, LaTeX | Class.Quant.Grav. 15 (1998) 1375-1385 | 10.1088/0264-9381/15/5/019 | WATPHYS TH-97/16 | gr-qc | null | We consider a Palatini variation on a general $N$-Dimensional second order,
torsion-free dilaton gravity action and determine the resulting equations of
motion. Consistency is checked by considering the restraint imposed due to
invariance of the matter action under simple coordinate transformations, and
the special c... | [
{
"created": "Fri, 31 Oct 1997 21:22:56 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Burton",
"H.",
""
],
[
"Mann",
"R. B.",
""
]
] | We consider a Palatini variation on a general $N$-Dimensional second order, torsion-free dilaton gravity action and determine the resulting equations of motion. Consistency is checked by considering the restraint imposed due to invariance of the matter action under simple coordinate transformations, and the special cas... |
gr-qc/0305019 | Yee J. Ng | Y. Jack Ng (University of North Carolina) | Selected topics in Planck-scale physics | 31 pages, 1 figure; minor changes; to appear in Mod. Phys. Lett. A as
a Brief Review | Mod.Phys.Lett.A18:1073-1098,2003 | 10.1142/S0217732303010934 | null | gr-qc astro-ph hep-ph hep-th | null | We review a few topics in Planck-scale physics, with emphasis on possible
manifestations in relatively low energy. The selected topics include quantum
fluctuations of spacetime, their cumulative effects, uncertainties in
energy-momentum measurements, and low energy quantum-gravity phenomenology. The
focus is on quant... | [
{
"created": "Sun, 4 May 2003 21:22:11 GMT",
"version": "v1"
},
{
"created": "Thu, 15 May 2003 19:00:08 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Ng",
"Y. Jack",
"",
"University of North Carolina"
]
] | We review a few topics in Planck-scale physics, with emphasis on possible manifestations in relatively low energy. The selected topics include quantum fluctuations of spacetime, their cumulative effects, uncertainties in energy-momentum measurements, and low energy quantum-gravity phenomenology. The focus is on quantum... |
1807.06509 | Lior M. Burko | Caroline Mallary, Gaurav Khanna, Lior M. Burko | Physical objects approaching the Cauchy horizon of a rapidly rotating
Kerr black hole | null | Phys. Rev. D 98, 104024 (2018) | 10.1103/PhysRevD.98.104024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve the 2+1-dimensional Teukolsky equation numerically for the Weyl
scalars $\psi_0$ and $\psi_4$ along a time-like geodesic approaching the Cauchy
horizon of a rapidly rotating perturbed Kerr black hole. We find that both the
amplitude and frequency of the Weyl scalars agree with the results of linear
perturbat... | [
{
"created": "Tue, 17 Jul 2018 15:46:37 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2018 19:26:02 GMT",
"version": "v2"
}
] | 2018-12-10 | [
[
"Mallary",
"Caroline",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Burko",
"Lior M.",
""
]
] | We solve the 2+1-dimensional Teukolsky equation numerically for the Weyl scalars $\psi_0$ and $\psi_4$ along a time-like geodesic approaching the Cauchy horizon of a rapidly rotating perturbed Kerr black hole. We find that both the amplitude and frequency of the Weyl scalars agree with the results of linear perturbatio... |
2105.09294 | Lorenzo Gavassino | Lorenzo Gavassino | Proving the Lorentz invariance of the entropy and the covariance of
thermodynamics | 10 pages | Foundations of Physics volume 52, Article number: 11 (2022) | 10.1007/s10701-021-00518-w | null | gr-qc astro-ph.HE cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard argument for the Lorentz invariance of the thermodynamic entropy
in equilibrium is based on the assumption that it is possible to perform an
adiabatic transformation whose only outcome is to accelerate a macroscopic
body, keeping its rest mass unchanged. The validity of this assumption
constitutes the ve... | [
{
"created": "Wed, 19 May 2021 17:55:25 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jun 2021 16:15:21 GMT",
"version": "v2"
}
] | 2021-12-15 | [
[
"Gavassino",
"Lorenzo",
""
]
] | The standard argument for the Lorentz invariance of the thermodynamic entropy in equilibrium is based on the assumption that it is possible to perform an adiabatic transformation whose only outcome is to accelerate a macroscopic body, keeping its rest mass unchanged. The validity of this assumption constitutes the very... |
2402.13665 | Nikolaos Dimakis | Homa Shababi, Theophanes Grammenos, Nikolaos Dimakis, Andronikos
Paliathanasis and Theodosios Christodoulakis | A five-dimensional Bianchi type V-like extension | 21 pages, 4 figures, Latex2e source file | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We uncover the solution space of a five dimensional geometry which we deem it
as the direct counterpart of the Bianchi Type V cosmological model. We
kinematically reduce the scale factor matrix and then, with an appropriate
scaling and choice of time, we cast the spatial equations into a simple
``Kasner'' like form; ... | [
{
"created": "Wed, 21 Feb 2024 09:55:17 GMT",
"version": "v1"
}
] | 2024-02-22 | [
[
"Shababi",
"Homa",
""
],
[
"Grammenos",
"Theophanes",
""
],
[
"Dimakis",
"Nikolaos",
""
],
[
"Paliathanasis",
"Andronikos",
""
],
[
"Christodoulakis",
"Theodosios",
""
]
] | We uncover the solution space of a five dimensional geometry which we deem it as the direct counterpart of the Bianchi Type V cosmological model. We kinematically reduce the scale factor matrix and then, with an appropriate scaling and choice of time, we cast the spatial equations into a simple ``Kasner'' like form; th... |
0709.4391 | De-Chang Dai | De-Chang Dai, Irit Maor and Glenn Starkman | Modified Gravity: living without Birkhoff I. DGP | 5 pages, 3 figures | Phys.Rev.D77:064016,2008 | 10.1103/PhysRevD.77.064016 | null | gr-qc astro-ph | null | We consider the consequences of the absence of Birkhoff's theorem in theories
of modified gravity. As an example, we calculate the gravitational force on a
test particle due to a spherical mass shell in the Dvali-Gabadaze-Porrati model
(DGP). We show that unlike in General Relativity, the force depends on the mass
di... | [
{
"created": "Thu, 27 Sep 2007 13:23:00 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Dec 2007 17:59:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dai",
"De-Chang",
""
],
[
"Maor",
"Irit",
""
],
[
"Starkman",
"Glenn",
""
]
] | We consider the consequences of the absence of Birkhoff's theorem in theories of modified gravity. As an example, we calculate the gravitational force on a test particle due to a spherical mass shell in the Dvali-Gabadaze-Porrati model (DGP). We show that unlike in General Relativity, the force depends on the mass dist... |
1111.4187 | Roberto Chan | R. Chan, M. F. A. da Silva, P. Senna, J. F. Villas da Rocha | Gravastars with Dark Energy Evolving to Naked Singularity | 18 pages and 6 figures. arXiv admin note: substantial text overlap
with arXiv:1012.1233 and arXiv:0812.4924v2 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a gravastar model made of anisotropic dark energy with an
infinitely thin spherical shell of a perfect fluid with the equation of state
$p = (1-\gamma)\sigma$ with an external de Sitter-Schwarzschild region. It is
found that in some cases the models represent the "bounded excursion" stable
gravastars, whe... | [
{
"created": "Thu, 17 Nov 2011 19:20:21 GMT",
"version": "v1"
}
] | 2015-03-19 | [
[
"Chan",
"R.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"Senna",
"P.",
""
],
[
"da Rocha",
"J. F. Villas",
""
]
] | We consider a gravastar model made of anisotropic dark energy with an infinitely thin spherical shell of a perfect fluid with the equation of state $p = (1-\gamma)\sigma$ with an external de Sitter-Schwarzschild region. It is found that in some cases the models represent the "bounded excursion" stable gravastars, where... |
2010.00151 | Tianchi Ma | Tian-Chi Ma and He-Xu Zhang and Peng-Zhang He and Hao-Ran Zhang and
Yuan Chen and Jian-Bo Deng | Shadow cast by a rotating and nonlinear magnetic-charged black hole in
perfect fluid dark matter | null | null | 10.1142/S0217732321501121 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derived an exact solution of the spherically symmetric Hayward black hole
surrounded by perfect fluid dark matter (PFDM). By applying the Newman-Janis
algorithm, we generalized it to the corresponding rotating black hole. Then, we
studied the shadows of rotating Hayward black hole in PFDM. The apparent shape
of th... | [
{
"created": "Thu, 1 Oct 2020 00:03:45 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Mar 2021 14:22:42 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Dec 2021 19:00:51 GMT",
"version": "v3"
}
] | 2021-12-21 | [
[
"Ma",
"Tian-Chi",
""
],
[
"Zhang",
"He-Xu",
""
],
[
"He",
"Peng-Zhang",
""
],
[
"Zhang",
"Hao-Ran",
""
],
[
"Chen",
"Yuan",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | We derived an exact solution of the spherically symmetric Hayward black hole surrounded by perfect fluid dark matter (PFDM). By applying the Newman-Janis algorithm, we generalized it to the corresponding rotating black hole. Then, we studied the shadows of rotating Hayward black hole in PFDM. The apparent shape of the ... |
1102.2626 | A. Tawfik | A. Tawfik (Egyptian Ctr. Theor. Phys., Cairo) | The Hubble parameter in the early universe with viscous QCD matter and
finite cosmological constant | 9 pages, 4 eps figures, 5 eps graphs, revtex4-style. arXiv admin
note: text overlap with arXiv:gr-qc/0110119 and arXiv:1001.2814 | Ann. Phys. (Berlin) 523, No. 5, 423 - 434 (2011) | 10.1002/andp.201100038 | ECTP-2011-01 | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of a flat, isotropic and homogeneous universe is studied. The
background geometry in the early phases of the universe is conjectured to be
filled with causal bulk viscous cosmological fluid and dark energy. The energy
density relations obtained from the assumption of covariant conservation of
energy-mom... | [
{
"created": "Sun, 13 Feb 2011 19:25:31 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Apr 2012 20:31:36 GMT",
"version": "v2"
}
] | 2012-04-23 | [
[
"Tawfik",
"A.",
"",
"Egyptian Ctr. Theor. Phys., Cairo"
]
] | The evolution of a flat, isotropic and homogeneous universe is studied. The background geometry in the early phases of the universe is conjectured to be filled with causal bulk viscous cosmological fluid and dark energy. The energy density relations obtained from the assumption of covariant conservation of energy-momen... |
gr-qc/9401031 | Biplab Bhawal | Biplab Bhawal and Vijay Chickarmane | Squeezing and Dual Recycling in Laser Interferometric Gravitational Wave
Detectors | Plain tex, 11 pages, 1 figure available on request from
biplab@iucaa.ernet.in | Phys.Lett. A190 (1994) 22; Erratum-ibid. A196 (1995) 377 | 10.1016/0375-9601(94)90360-3 | null | gr-qc | null | We calculate the response of an ideal Michelson interferometer incorporating
both dual recycling and squeezed light to gravitational waves. The photon
counting noise has contributions from the light which is sent in through the
input ports as well as the vacuum modes at sideband frequencies generated by
the gravitati... | [
{
"created": "Tue, 25 Jan 1994 15:00:42 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Bhawal",
"Biplab",
""
],
[
"Chickarmane",
"Vijay",
""
]
] | We calculate the response of an ideal Michelson interferometer incorporating both dual recycling and squeezed light to gravitational waves. The photon counting noise has contributions from the light which is sent in through the input ports as well as the vacuum modes at sideband frequencies generated by the gravitation... |
1312.6425 | Abhay Ashtekar | Abhay Ashtekar | The Last 50 Years of General Relativity and Gravitation: From GR3 to
GR20 Warsaw Conferences | 15 pages, one figure. Minor typos corrected. A para on talks at GR3
on asymptotics added in the beginning of Section 2 | Gen. Relativ. Gravit. 46, 1706 (2014) | 10.1007/s10714-014-1706-2 | IGC-13/12-2 | gr-qc hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article has a dual purpose: i) to provide a flavor of the scientific
highlights of the landmark conference, GR3, held in July 1962 at Jablonna, near
Warsaw; and, ii) to present a bird's eye view of the tremendous advances that
have occurred over the half century that separates GR3 and GR20, which was
again held ... | [
{
"created": "Sun, 22 Dec 2013 21:17:59 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 2014 17:48:52 GMT",
"version": "v2"
}
] | 2014-04-17 | [
[
"Ashtekar",
"Abhay",
""
]
] | This article has a dual purpose: i) to provide a flavor of the scientific highlights of the landmark conference, GR3, held in July 1962 at Jablonna, near Warsaw; and, ii) to present a bird's eye view of the tremendous advances that have occurred over the half century that separates GR3 and GR20, which was again held in... |
gr-qc/9709016 | Joan Masso | Carles Bona, Joan Masso, Ed Seidel and Joan Stela | First order hyperbolic formalism for Numerical Relativity | To appear in Phys. Rev. D | Phys.Rev.D56:3405-3415,1997 | 10.1103/PhysRevD.56.3405 | null | gr-qc | null | The causal structure of Einstein's evolution equations is considered. We show
that in general they can be written as a first order system of balance laws for
any choice of slicing or shift. We also show how certain terms in the evolution
equations, that can lead to numerical inaccuracies, can be eliminated by using
t... | [
{
"created": "Sun, 7 Sep 1997 16:10:37 GMT",
"version": "v1"
}
] | 2011-04-21 | [
[
"Bona",
"Carles",
""
],
[
"Masso",
"Joan",
""
],
[
"Seidel",
"Ed",
""
],
[
"Stela",
"Joan",
""
]
] | The causal structure of Einstein's evolution equations is considered. We show that in general they can be written as a first order system of balance laws for any choice of slicing or shift. We also show how certain terms in the evolution equations, that can lead to numerical inaccuracies, can be eliminated by using the... |
1704.05639 | Edgar Gasperin | Alfonso Garc\'ia-Parrado G\'omez-Lobo, Edgar Gasperin, Juan A.
Valiente Kroon | Conformal geodesics in spherically symmetric vacuum spacetimes with
Cosmological constant | 51 pages, 12 figures. Minor changes. File updated. To appear in CQG | null | 10.1088/1361-6382/aa9f59 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analysis of conformal geodesics in the Schwarzschild-de Sitter and
Schwarzschild-anti de Sitter families of spacetimes is given. For both families
of spacetimes we show that initial data on a spacelike hypersurface can be
given such that the congruence of conformal geodesics arising from this data
cover the whole ... | [
{
"created": "Wed, 19 Apr 2017 07:49:27 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2017 21:02:35 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Gómez-Lobo",
"Alfonso García-Parrado",
""
],
[
"Gasperin",
"Edgar",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | An analysis of conformal geodesics in the Schwarzschild-de Sitter and Schwarzschild-anti de Sitter families of spacetimes is given. For both families of spacetimes we show that initial data on a spacelike hypersurface can be given such that the congruence of conformal geodesics arising from this data cover the whole ma... |
1711.09430 | Lavinia Heisenberg | Lavinia Heisenberg and Shinji Tsujikawa | Dark energy survivals in massive gravity after GW170817: SO(3) invariant | 26 pages, 2 figues | null | 10.1088/1475-7516/2018/01/044 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent detection of the gravitational wave signal GW170817 together with
an electromagnetic counterpart GRB 170817A from the merger of two neutron stars
puts a stringent bound on the tensor propagation speed. This constraint can be
automatically satisfied in the framework of massive gravity. In this work we
consi... | [
{
"created": "Sun, 26 Nov 2017 17:36:57 GMT",
"version": "v1"
}
] | 2022-08-03 | [
[
"Heisenberg",
"Lavinia",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | The recent detection of the gravitational wave signal GW170817 together with an electromagnetic counterpart GRB 170817A from the merger of two neutron stars puts a stringent bound on the tensor propagation speed. This constraint can be automatically satisfied in the framework of massive gravity. In this work we conside... |
2306.11588 | Andrea Pierfrancesco Sanna | M. Cadoni, A. P. Sanna, M. Pitzalis, B. Banerjee, R. Murgia, N. Hazra,
M. Branchesi | Cosmological coupling of nonsingular black holes | 12 pages, 2 figures, discussions/references added, matches the
version published in JCAP | JCAP 11 (2023), 007 | 10.1088/1475-7516/2023/11/007 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that -- in the framework of general relativity (GR) -- if black holes
(BHs) are singularity-free objects, they couple to the large-scale cosmological
dynamics. We find that the leading contribution to the resulting growth of the
BH mass ($M_{\rm BH}$) as a function of the scale factor $a$ stems from the
curva... | [
{
"created": "Tue, 20 Jun 2023 15:05:08 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Dec 2023 10:00:03 GMT",
"version": "v2"
}
] | 2023-12-04 | [
[
"Cadoni",
"M.",
""
],
[
"Sanna",
"A. P.",
""
],
[
"Pitzalis",
"M.",
""
],
[
"Banerjee",
"B.",
""
],
[
"Murgia",
"R.",
""
],
[
"Hazra",
"N.",
""
],
[
"Branchesi",
"M.",
""
]
] | We show that -- in the framework of general relativity (GR) -- if black holes (BHs) are singularity-free objects, they couple to the large-scale cosmological dynamics. We find that the leading contribution to the resulting growth of the BH mass ($M_{\rm BH}$) as a function of the scale factor $a$ stems from the curvatu... |
0812.4217 | Ran Li | Ran Li, Ji-Rong Ren and Dun-Fu Shi | Fermions Tunneling from Apparent Horizon of FRW Universe | 8 pages, no figures | Phys.Lett.B670:446-448,2009 | 10.1016/j.physletb.2008.11.029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper [arXiv:0809.1554], the scalar particles' Hawking radiation from
the apparent horizon of Friedmann-Robertson-Walker(FRW) universe was
investigated by using the tunneling formalism. They obtained the Hawking
temperature associated with the apparent horizon, which was extensively applied
in investigating th... | [
{
"created": "Mon, 22 Dec 2008 15:25:45 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Li",
"Ran",
""
],
[
"Ren",
"Ji-Rong",
""
],
[
"Shi",
"Dun-Fu",
""
]
] | In the paper [arXiv:0809.1554], the scalar particles' Hawking radiation from the apparent horizon of Friedmann-Robertson-Walker(FRW) universe was investigated by using the tunneling formalism. They obtained the Hawking temperature associated with the apparent horizon, which was extensively applied in investigating the ... |
gr-qc/9212010 | null | A. Casher and F. Englert | Black Hole Tunneling Entropy and the Spectrum of Gravity | 26 pages + 3 figures, phyzzx macropackage, figures available from
Authors | Class.Quant.Grav.10:2479-2494,1993 | 10.1088/0264-9381/10/12/007 | ULB-TH 8/92 and TAUP 2017-92 | gr-qc hep-th | null | The tunneling approach for entropy generation in quantum gravity is applied
to black holes. The area entropy is recovered and shown to count only a tiny
fraction of the black hole degeneracy. The latter stems from the extension of
the wave function outside the barrier. In fact the semi-classical analysis
leads to inf... | [
{
"created": "Tue, 15 Dec 1992 13:51:00 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Casher",
"A.",
""
],
[
"Englert",
"F.",
""
]
] | The tunneling approach for entropy generation in quantum gravity is applied to black holes. The area entropy is recovered and shown to count only a tiny fraction of the black hole degeneracy. The latter stems from the extension of the wave function outside the barrier. In fact the semi-classical analysis leads to infin... |
2106.14188 | Mattia Villani Dr | Mattia Villani | Including topology change in Loop Quantum Gravity with topspin network
formalism with application to homogeneous and isotropic cosmology | Accepted for the pubblication on Class. Quantum Grav | null | 10.1088/1361-6382/ac0e1a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply topspin network formalism to Loop Quantum Gravity in order to
include in the theory the possibility of changes in the topology of spacetime.
We apply this formalism to three toy models: with the first, we find that the
topology can actually change due to the action of the Hamiltonian constraint
and with the ... | [
{
"created": "Sun, 27 Jun 2021 10:28:11 GMT",
"version": "v1"
}
] | 2021-06-29 | [
[
"Villani",
"Mattia",
""
]
] | We apply topspin network formalism to Loop Quantum Gravity in order to include in the theory the possibility of changes in the topology of spacetime. We apply this formalism to three toy models: with the first, we find that the topology can actually change due to the action of the Hamiltonian constraint and with the se... |
gr-qc/0505067 | Djordje Sijacki | Djordje Sijacki | Affine Particles and Fields | null | Int.J.Geom.Meth.Mod.Phys. 2 (2005) 189-201 | null | null | gr-qc | null | The covering of the affine symmetry group, a semidirect product of
translations and special linear transformations, in $D \geq 3$ dimensional
spacetime is considered. Infinite dimensional spinorial representations on
states and fields are presented. A Dirac-like affine equation, with infinite
matrices generalizing th... | [
{
"created": "Fri, 13 May 2005 12:01:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sijacki",
"Djordje",
""
]
] | The covering of the affine symmetry group, a semidirect product of translations and special linear transformations, in $D \geq 3$ dimensional spacetime is considered. Infinite dimensional spinorial representations on states and fields are presented. A Dirac-like affine equation, with infinite matrices generalizing the ... |
1803.11044 | Burkhard Kleihaus | Christian Hoffmann (Massachusetts U., Amherst & Oldenburg U.),
Theodora Ioannidou (Aristotle U., Thessaloniki), Sarah Kahlen, Burkhard
Kleihaus, and Jutta Kunz (Oldenburg U.) | Symmetric and Asymmetric Wormholes Immersed In Rotating Matter | 24 pages, 11 figures | Phys. Rev. D 97, 124019 (2018) | 10.1103/PhysRevD.97.124019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider four-dimensional wormholes immersed in bosonic matter. While
their existence is based on the presence of a phantom field, many of their
interesting physical properties are bestowed upon them by an ordinary complex
scalar field, which carries only a mass term, but no self-interactions. For
instance, the ro... | [
{
"created": "Thu, 29 Mar 2018 13:10:07 GMT",
"version": "v1"
}
] | 2018-06-20 | [
[
"Hoffmann",
"Christian",
"",
"Massachusetts U., Amherst & Oldenburg U."
],
[
"Ioannidou",
"Theodora",
"",
"Aristotle U., Thessaloniki"
],
[
"Kahlen",
"Sarah",
"",
"Oldenburg U."
],
[
"Kleihaus",
"Burkhard",
"",
"Oldenburg U."
],
[
... | We consider four-dimensional wormholes immersed in bosonic matter. While their existence is based on the presence of a phantom field, many of their interesting physical properties are bestowed upon them by an ordinary complex scalar field, which carries only a mass term, but no self-interactions. For instance, the rota... |
1409.2877 | Carlos A. R. Herdeiro | Carlos Herdeiro, Eugen Radu, Helgi Runarsson | Non-linear Q-clouds around Kerr black holes | 11 pages, 4 figures | null | 10.1016/j.physletb.2014.11.005 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Q-balls are regular extended `objects' that exist for some non-gravitating,
self-interacting, scalar field theories with a global, continuous, internal
symmetry, on Minkowski spacetime. Here, analogous objects are also shown to
exist around rotating (Kerr) black holes, as non-linear bound states of a test
scalar fiel... | [
{
"created": "Tue, 9 Sep 2014 20:00:16 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Herdeiro",
"Carlos",
""
],
[
"Radu",
"Eugen",
""
],
[
"Runarsson",
"Helgi",
""
]
] | Q-balls are regular extended `objects' that exist for some non-gravitating, self-interacting, scalar field theories with a global, continuous, internal symmetry, on Minkowski spacetime. Here, analogous objects are also shown to exist around rotating (Kerr) black holes, as non-linear bound states of a test scalar field.... |
gr-qc/0410052 | Kamal Nandi | K.K. Nandi and D.H. Xu | Unruh model for the Einstein-Rosen charge: Squealing Wormholes? | 10 pages | null | null | null | gr-qc | null | We present two kinds of acoustic models for the massless electric charge
conceived by Einstein and Rosen in the form of a bridge (wormhole throat). It
is found that the first kind of modelling requires a thin layer of exotic
matter at the bridge. We also derive an acoustic equation that exclusively
characterizes the ... | [
{
"created": "Tue, 12 Oct 2004 14:04:49 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2004 09:07:50 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Nandi",
"K. K.",
""
],
[
"Xu",
"D. H.",
""
]
] | We present two kinds of acoustic models for the massless electric charge conceived by Einstein and Rosen in the form of a bridge (wormhole throat). It is found that the first kind of modelling requires a thin layer of exotic matter at the bridge. We also derive an acoustic equation that exclusively characterizes the mo... |
2205.14635 | Handhika Ramadhan | A S. Habibina and H. S. Ramadhan | Bound orbits around charged black strings | 29 pages, 12 figures, 8 tables, accepted for publication in Annals of
Physics | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the geodesics of $5d$ Reissner-Nordstrom and nonsingular black
strings, and establish a rational bound orbit taxonomy for both massive as well
as null test particles. For the timelike case, test particles with high energy
(that would have made them plunge into or scatter off a black hole) could still
form bo... | [
{
"created": "Sun, 29 May 2022 11:56:22 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2022 10:01:19 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jun 2022 09:00:56 GMT",
"version": "v3"
},
{
"created": "Thu, 16 Jun 2022 11:37:24 GMT",
"version": "v4"
},
{
"c... | 2022-11-22 | [
[
"Habibina",
"A S.",
""
],
[
"Ramadhan",
"H. S.",
""
]
] | We study the geodesics of $5d$ Reissner-Nordstrom and nonsingular black strings, and establish a rational bound orbit taxonomy for both massive as well as null test particles. For the timelike case, test particles with high energy (that would have made them plunge into or scatter off a black hole) could still form boun... |
1501.05481 | Shahram Panahiyan | S. H. Hendi and S. Panahiyan | Thermodynamic instability of topological black holes in Gauss-Bonnet
gravity with a generalized electrodynamics | 16 pages, 6 figures | Phys. Rev. D 90, 124008 (2014) | 10.1103/PhysRevD.90.124008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the string corrections on the gravity and electrodynamics sides,
we consider a quadratic Maxwell invariant term as a correction of the Maxwell
Lagrangian to obtain exact solutions of higher dimensional topological black
holes in Gauss-Bonnet gravity. We first investigate the asymptotically flat
solutions... | [
{
"created": "Thu, 22 Jan 2015 12:52:24 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Hendi",
"S. H.",
""
],
[
"Panahiyan",
"S.",
""
]
] | Motivated by the string corrections on the gravity and electrodynamics sides, we consider a quadratic Maxwell invariant term as a correction of the Maxwell Lagrangian to obtain exact solutions of higher dimensional topological black holes in Gauss-Bonnet gravity. We first investigate the asymptotically flat solutions a... |
2309.16734 | Hassan Mehmood | Hassan Mehmood | Quantum Gravity as a Theory of Connections | Bachelor's thesis, Lahore University of Management Sciences, 158
pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Consider the interior of a black hole or the very early universe: matter is
so densely localized that neither the effects of gravity nor those of quantum
theory can be ignored. But this entails that neither general relativity nor
quantum theory on its own can fully describe such a situation, for some of the
most fund... | [
{
"created": "Wed, 27 Sep 2023 20:02:20 GMT",
"version": "v1"
}
] | 2023-10-02 | [
[
"Mehmood",
"Hassan",
""
]
] | Consider the interior of a black hole or the very early universe: matter is so densely localized that neither the effects of gravity nor those of quantum theory can be ignored. But this entails that neither general relativity nor quantum theory on its own can fully describe such a situation, for some of the most fundam... |
2110.11289 | Valerio Faraoni | Valerio Faraoni, Sonia Jose, and Alexandre Leblanc | The curious case of the Buchdahl-Land-Sultana-Wyman-Iba\~nez-Sanz
spacetime | 11 pages, 3 figures | null | 10.1103/PhysRevD.105.024030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit Wyman's "other" scalar field solution of the Einstein equations
and its Sultana generalization to positive cosmological constant, which has a
finite 3-space and corresponds to a special case of a stiff fluid solution
proposed by Buchdahl and Land and, later, by Iba\~nez and Sanz to model
relativistic stars... | [
{
"created": "Thu, 21 Oct 2021 17:17:31 GMT",
"version": "v1"
}
] | 2022-01-26 | [
[
"Faraoni",
"Valerio",
""
],
[
"Jose",
"Sonia",
""
],
[
"Leblanc",
"Alexandre",
""
]
] | We revisit Wyman's "other" scalar field solution of the Einstein equations and its Sultana generalization to positive cosmological constant, which has a finite 3-space and corresponds to a special case of a stiff fluid solution proposed by Buchdahl and Land and, later, by Iba\~nez and Sanz to model relativistic stars. ... |
1707.07674 | Abdul Jawad | Abdul Jawad and M. Umair Shahzad | Accreting Fluids onto Regular Black Holes Via Hamiltonian Approach | 25 pages; 10 Figures | null | 10.1140/epjc/s10052-017-5075-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the accretion of test fluids onto regular black holes such as
Kehagias-Sfetsos black hole and a regular black hole with Dagum Distribution
Function. We analyze the accretion process when different test fluids are
falling onto these regular black holes. The accreting fluid is being classified
through eq... | [
{
"created": "Mon, 24 Jul 2017 08:59:41 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Jawad",
"Abdul",
""
],
[
"Shahzad",
"M. Umair",
""
]
] | We investigate the accretion of test fluids onto regular black holes such as Kehagias-Sfetsos black hole and a regular black hole with Dagum Distribution Function. We analyze the accretion process when different test fluids are falling onto these regular black holes. The accreting fluid is being classified through equa... |
2112.13869 | Mostafizur Rahman | Mostafizur Rahman and Arpan Bhattacharyya | Prospects for determining the nature of the secondaries of extreme
mass-ratio inspirals using the spin-induced quadrupole deformation | 24 pages, 7 figures, 5 tables. Typos corrected. Accepted for
publication in PRD | Phys.Rev.D 107 (2023) 02 | 10.1103/PhysRevD.107.024006 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The measurement of multipole moments of astrophysical objects through
gravitational wave (GW) observations provides a novel way to distinguish black
holes from other astrophysical objects. This paper studies the gravitational
wave radiation from an extreme mass ratio inspiral (EMRI) system consisting of
a supermassiv... | [
{
"created": "Mon, 27 Dec 2021 19:07:27 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2022 18:10:05 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Dec 2022 10:53:23 GMT",
"version": "v3"
}
] | 2023-01-10 | [
[
"Rahman",
"Mostafizur",
""
],
[
"Bhattacharyya",
"Arpan",
""
]
] | The measurement of multipole moments of astrophysical objects through gravitational wave (GW) observations provides a novel way to distinguish black holes from other astrophysical objects. This paper studies the gravitational wave radiation from an extreme mass ratio inspiral (EMRI) system consisting of a supermassive ... |
gr-qc/9511081 | Thomas Kloesch | T. Kloesch and T. Strobl | Classical and Quantum Gravity in 1+1 Dimensions, Part II: The Universal
Coverings | 29 pages, 14 Postscript figures; one figure, some paragraphs, and
references added; to appear in Class. Quantum Grav | Class.Quant.Grav.13:2395-2422,1996 | 10.1088/0264-9381/13/9/007 | TUW-95-23, PITHA-95/24 | gr-qc hep-th | null | A set of simple rules for constructing the maximal (e.g. analytic) extensions
for any metric with a Killing field in an (effectively) two-dimensional
spacetime is formulated. The application of these rules is extremely
straightforward, as is demonstrated at various examples and illustrated with
numerous figures. Desp... | [
{
"created": "Thu, 30 Nov 1995 13:26:42 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 1996 09:25:34 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Apr 1996 09:02:02 GMT",
"version": "v3"
}
] | 2010-04-06 | [
[
"Kloesch",
"T.",
""
],
[
"Strobl",
"T.",
""
]
] | A set of simple rules for constructing the maximal (e.g. analytic) extensions for any metric with a Killing field in an (effectively) two-dimensional spacetime is formulated. The application of these rules is extremely straightforward, as is demonstrated at various examples and illustrated with numerous figures. Despit... |
2109.12086 | Joan Sola | Joan Sola Peracaula | Running vacuum interacting with dark matter or with running
gravitational coupling. Phenomenological implications | 21 pages, slightly extended discussion. References added and others
updated. Invited talk in the 16th Marcel-Grossmann virtual Conference (MG16),
parallel session DM1: Interacting Dark Matter | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The cosmological term, $\Lambda$, in Einstein's equations is an essential
ingredient of the `concordance' $\Lambda$CDM model of cosmology. In this
mini-review presentation, we assess the possibility that $\Lambda$ can be a
dynamical quantity, more specifically a `running quantity' in quantum field
theory in curved sp... | [
{
"created": "Fri, 24 Sep 2021 17:25:03 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Dec 2021 10:34:24 GMT",
"version": "v2"
}
] | 2022-07-19 | [
[
"Peracaula",
"Joan Sola",
""
]
] | The cosmological term, $\Lambda$, in Einstein's equations is an essential ingredient of the `concordance' $\Lambda$CDM model of cosmology. In this mini-review presentation, we assess the possibility that $\Lambda$ can be a dynamical quantity, more specifically a `running quantity' in quantum field theory in curved spac... |
1301.1480 | Javad Taghizadeh firouzjaee | Rahim Moradi, Javad T. Firouzjaee and Reza Mansouri | The spherical perfect fluid collapse with pressure in the cosmological
background | null | null | 10.1142/9789813226609_0593 | Proceedings of the MG14 Meeting on General Relativity, C15-07-12 | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/3.0/ | We have constructed a spherically symmetric structure model in a cosmological
background filled with perfect fluid with non-vanishing pressure and studied
its quasi-local characteristics. This is done by using the Lema\^{i}tre
solution of the Einstein equations and suggesting an algorithm to integrate it
numerically.... | [
{
"created": "Tue, 8 Jan 2013 10:41:49 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 2013 14:12:11 GMT",
"version": "v2"
}
] | 2017-12-11 | [
[
"Moradi",
"Rahim",
""
],
[
"Firouzjaee",
"Javad T.",
""
],
[
"Mansouri",
"Reza",
""
]
] | We have constructed a spherically symmetric structure model in a cosmological background filled with perfect fluid with non-vanishing pressure and studied its quasi-local characteristics. This is done by using the Lema\^{i}tre solution of the Einstein equations and suggesting an algorithm to integrate it numerically. T... |
0810.5038 | Margus Saal | Piret Kuusk, Laur Jarv, Margus Saal | Scalar-tensor cosmologies: general relativity as a fixed point of the
Jordan frame scalar field | 9 pages, talk at Seventh Alexander Friedmann International Seminar on
Gravitation and Cosmology | Int.J.Mod.Phys.A24:1631-1638,2009 | 10.1142/S0217751X09045133 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of homogeneous and isotropic, flat cosmological models
within the general scalar-tensor theory of gravity with arbitrary coupling
function and potential and scrutinize its limit to general relativity. Using
the methods of dynamical systems for the decoupled equation of the Jordan frame
scalar f... | [
{
"created": "Tue, 28 Oct 2008 14:31:22 GMT",
"version": "v1"
}
] | 2009-04-24 | [
[
"Kuusk",
"Piret",
""
],
[
"Jarv",
"Laur",
""
],
[
"Saal",
"Margus",
""
]
] | We study the evolution of homogeneous and isotropic, flat cosmological models within the general scalar-tensor theory of gravity with arbitrary coupling function and potential and scrutinize its limit to general relativity. Using the methods of dynamical systems for the decoupled equation of the Jordan frame scalar fie... |
1809.04408 | Zacharias Roupas | Zacharias Roupas | Gravitational instability caused by the weight of heat | Typos corrected in last update | Symmetry 2019, 11(12), 1435 | 10.3390/sym11121435 | null | gr-qc astro-ph.HE cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal energy points toward a disordered, completely uniform state acting
counter to gravity's tendency to generate order and structure through
gravitational collapse. It is, therefore, expected to contribute to the
stabilization of a self-gravitating, classical ideal gas over collapse.
However, I identified an inst... | [
{
"created": "Wed, 12 Sep 2018 13:19:00 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Oct 2019 12:22:09 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Nov 2019 10:31:41 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Nov 2019 06:37:51 GMT",
"version": "v4"
},
{
"cr... | 2019-12-03 | [
[
"Roupas",
"Zacharias",
""
]
] | Thermal energy points toward a disordered, completely uniform state acting counter to gravity's tendency to generate order and structure through gravitational collapse. It is, therefore, expected to contribute to the stabilization of a self-gravitating, classical ideal gas over collapse. However, I identified an instab... |
2203.13830 | Alex Davey | Alex Davey, Oscar J.C. Dias, Paul Rodgers, Jorge E. Santos | Strong Cosmic Censorship and Eigenvalue Repulsions for rotating de
Sitter black holes in higher-dimensions | 43 pages, 13 figures | null | 10.1007/JHEP07(2022)086 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been established that Christodoulou's formulation of Strong Cosmic
Censorship (SCC) is violated by Reissner-Nordstr\"om-de Sitter black holes, but
holds in four-dimensional Kerr-de Sitter black holes. We show that SCC is also
respected by equal angular momenta (cohomogeneity-1) Myers-Perry-de Sitter
(MP-dS) in... | [
{
"created": "Fri, 25 Mar 2022 18:00:02 GMT",
"version": "v1"
}
] | 2022-08-10 | [
[
"Davey",
"Alex",
""
],
[
"Dias",
"Oscar J. C.",
""
],
[
"Rodgers",
"Paul",
""
],
[
"Santos",
"Jorge E.",
""
]
] | It has been established that Christodoulou's formulation of Strong Cosmic Censorship (SCC) is violated by Reissner-Nordstr\"om-de Sitter black holes, but holds in four-dimensional Kerr-de Sitter black holes. We show that SCC is also respected by equal angular momenta (cohomogeneity-1) Myers-Perry-de Sitter (MP-dS) in o... |
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