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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1504.02767 | Jonathan R. Gair | Jonathan R. Gair, Christopher J. Moore | Quantifying and mitigating bias in inference on gravitational wave
source populations | 11 pages, 1 figure, to appear in Phys. Rev. D; v2 includes minor
changes for consistency with accepted version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When using incorrect or inaccurate signal models to perform parameter
estimation on a gravitational wave signal, biased parameter estimates will in
general be obtained. For a single event this bias may be consistent with the
posterior, but when considering a population of events this bias becomes
evident as a sag bel... | [
{
"created": "Fri, 10 Apr 2015 19:32:52 GMT",
"version": "v1"
},
{
"created": "Fri, 29 May 2015 09:16:10 GMT",
"version": "v2"
}
] | 2015-06-01 | [
[
"Gair",
"Jonathan R.",
""
],
[
"Moore",
"Christopher J.",
""
]
] | When using incorrect or inaccurate signal models to perform parameter estimation on a gravitational wave signal, biased parameter estimates will in general be obtained. For a single event this bias may be consistent with the posterior, but when considering a population of events this bias becomes evident as a sag below... |
2112.11431 | Michael A. Fedderke | Michael A. Fedderke, Peter W. Graham, and Surjeet Rajendran | Asteroids for $\mu$Hz gravitational-wave detection | 50 pages, 9 figures. Published version | Phys. Rev. D 105, 103018 (2022) | 10.1103/PhysRevD.105.103018 | null | gr-qc astro-ph.CO astro-ph.IM hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A major challenge for gravitational-wave (GW) detection in the $\mu$Hz band
is engineering a test mass (TM) with sufficiently low acceleration noise. We
propose a GW detection concept using asteroids located in the inner Solar
System as TMs. Our main purpose is to evaluate the acceleration noise of
asteroids in the $... | [
{
"created": "Tue, 21 Dec 2021 18:48:52 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2022 09:48:48 GMT",
"version": "v2"
}
] | 2022-05-19 | [
[
"Fedderke",
"Michael A.",
""
],
[
"Graham",
"Peter W.",
""
],
[
"Rajendran",
"Surjeet",
""
]
] | A major challenge for gravitational-wave (GW) detection in the $\mu$Hz band is engineering a test mass (TM) with sufficiently low acceleration noise. We propose a GW detection concept using asteroids located in the inner Solar System as TMs. Our main purpose is to evaluate the acceleration noise of asteroids in the $\m... |
1610.08791 | Cosimo Bambi | M. Ghasemi-Nodehi, Cosimo Bambi | Constraining the Kerr parameters via X-ray reflection spectroscopy | 8 pages, 5 figures. v2: refereed version | Phys. Rev. D 94, 104062 (2016) | 10.1103/PhysRevD.94.104062 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper [Ghasemi-Nodehi & Bambi, EPJC 76 (2016) 290], we have
proposed a new parametrization for testing the Kerr nature of astrophysical
black hole candidates. In the present work, we study the possibility of
constraining the "Kerr parameters" of our proposal using X-ray reflection
spectroscopy, the so-cal... | [
{
"created": "Thu, 27 Oct 2016 14:13:49 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2016 20:19:26 GMT",
"version": "v2"
}
] | 2016-11-30 | [
[
"Ghasemi-Nodehi",
"M.",
""
],
[
"Bambi",
"Cosimo",
""
]
] | In a recent paper [Ghasemi-Nodehi & Bambi, EPJC 76 (2016) 290], we have proposed a new parametrization for testing the Kerr nature of astrophysical black hole candidates. In the present work, we study the possibility of constraining the "Kerr parameters" of our proposal using X-ray reflection spectroscopy, the so-calle... |
gr-qc/0309132 | Michael T. Anderson | Michael T. Anderson | Asymptotic behavior of future-complete cosmological space-times | 16pp, to appear in the Classical and Quantum Gravity issue in Honor
of Vince Moncrief. Updated, changes made to Prop. 4.5 | Class.Quant.Grav. 21 (2004) S11-S28 | null | null | gr-qc | null | This work discusses the apriori possible asymptotic behavior to the future,
for (vacuum) space-times which are geodesically complete to the future and
which admit a foliation by compact constant mean curvature Cauchy surfaces.
| [
{
"created": "Sat, 27 Sep 2003 15:20:25 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jan 2004 15:24:23 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Anderson",
"Michael T.",
""
]
] | This work discusses the apriori possible asymptotic behavior to the future, for (vacuum) space-times which are geodesically complete to the future and which admit a foliation by compact constant mean curvature Cauchy surfaces. |
2208.09028 | Ernesto Contreras | E. Contreras, Z. Stuchlik | A simple protocol to construct solutions with vanishing complexity by
Gravitational Decoupling | A clarifying point not appearing in the published version regarding
the mimic constraint for the mass function, has been introduced in on page 5 | Eur. Phys. J. C 82, 706 (2022) | 10.1140/epjc/s10052-022-10684-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we develop a simple protocol to construct interior solutions
through Gravitational Decoupling by the Minimal Geometric Deformation extended
satisfying the vanishing complexity condition. The method is illustrated by
using Tolman VII and Tolman IV solutions as isotropic seeds.
| [
{
"created": "Thu, 18 Aug 2022 19:01:51 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Contreras",
"E.",
""
],
[
"Stuchlik",
"Z.",
""
]
] | In this work we develop a simple protocol to construct interior solutions through Gravitational Decoupling by the Minimal Geometric Deformation extended satisfying the vanishing complexity condition. The method is illustrated by using Tolman VII and Tolman IV solutions as isotropic seeds. |
gr-qc/9510070 | Robert Mann | C. Alvarez and R.B. Mann | The Equivalence Principle and g-2 Experiments | 4 pages, latex, epsf, 1 figure | Phys.Lett. B409 (1997) 83-87 | 10.1016/S0370-2693(97)00801-0 | WATPHYS-TH95/06 | gr-qc hep-ph | null | We consider the possibility of using measurements of anomalous magnetic
moments of elementary particles as a possible test of the Einstein Equivalence
Principle (EEP). For the class non-metric theories of gravity described by the
\tmu formalism we find several novel mechanisms for breaking the EEP, and
discuss the po... | [
{
"created": "Tue, 31 Oct 1995 18:11:49 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Alvarez",
"C.",
""
],
[
"Mann",
"R. B.",
""
]
] | We consider the possibility of using measurements of anomalous magnetic moments of elementary particles as a possible test of the Einstein Equivalence Principle (EEP). For the class non-metric theories of gravity described by the \tmu formalism we find several novel mechanisms for breaking the EEP, and discuss the poss... |
2211.07946 | S. Shankaranarayanan | Swastik Bhattacharya (BITS-Hyderabad) and S. Shankaranarayanan (IIT
Bombay) | Effective field theory description of horizon-fluid determines the
scrambling time | Version to appear in Universe (Open Questions in Black Hole Physics) | Universe 8(11), 603 (2022) | 10.3390/universe8110603 | null | gr-qc hep-th physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | Black hole horizons interact with external fields when matter-energy falls
through them. Such non-stationary black hole horizons can be described using
viscous fluid equations. This work attempts to describe this process using
effective field theory methods. Such a description can provide important
insights beyond cl... | [
{
"created": "Tue, 15 Nov 2022 07:13:34 GMT",
"version": "v1"
}
] | 2022-11-18 | [
[
"Bhattacharya",
"Swastik",
"",
"BITS-Hyderabad"
],
[
"Shankaranarayanan",
"S.",
"",
"IIT\n Bombay"
]
] | Black hole horizons interact with external fields when matter-energy falls through them. Such non-stationary black hole horizons can be described using viscous fluid equations. This work attempts to describe this process using effective field theory methods. Such a description can provide important insights beyond clas... |
2406.03568 | Elise S\"anger | Elise M. S\"anger, Soumen Roy, Michalis Agathos, Ofek Birnholtz,
Alessandra Buonanno, Tim Dietrich, Maria Haney, F\'elix-Louis Juli\'e,
Geraint Pratten, Jan Steinhoff, Chris Van Den Broeck, Sylvia Biscoveanu,
Prasanta Char, Anna Heffernan, Prathamesh Joshi, Atul Kedia, R. M. S.
Schofield, M. Trevor, and Michael... | Tests of General Relativity with GW230529: a neutron star merging with a
lower mass-gap compact object | 19 pages, 9 figures | null | null | LIGO-P2400200 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | On 29 May 2023, the LIGO Livingston observatory detected the
gravitational-wave signal GW230529_181500 from the merger of a neutron star
with a lower mass-gap compact object. Its long inspiral signal provides a
unique opportunity to test General Relativity (GR) in a parameter space
previously unexplored by strong-fie... | [
{
"created": "Wed, 5 Jun 2024 18:30:33 GMT",
"version": "v1"
}
] | 2024-06-07 | [
[
"Sänger",
"Elise M.",
""
],
[
"Roy",
"Soumen",
""
],
[
"Agathos",
"Michalis",
""
],
[
"Birnholtz",
"Ofek",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Haney",
"Maria",
""
],
[
... | On 29 May 2023, the LIGO Livingston observatory detected the gravitational-wave signal GW230529_181500 from the merger of a neutron star with a lower mass-gap compact object. Its long inspiral signal provides a unique opportunity to test General Relativity (GR) in a parameter space previously unexplored by strong-field... |
1412.6270 | Xavier Calmet | Xavier Calmet | Virtual Black Holes, Remnants and the Information Paradox | 8 pages | Class. Quantum Grav. 32 (2015) 045007 | 10.1088/0264-9381/32/4/045007 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the question of the contributions of Planckian quantum black holes
in general and of remnants in particular to low energy physics observables. As
long as quantum gravity preserves the symmetries of the low energy effective
field theory, we find that the bounds on the number of quantum black holes or
remnan... | [
{
"created": "Fri, 19 Dec 2014 10:10:31 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Calmet",
"Xavier",
""
]
] | We revisit the question of the contributions of Planckian quantum black holes in general and of remnants in particular to low energy physics observables. As long as quantum gravity preserves the symmetries of the low energy effective field theory, we find that the bounds on the number of quantum black holes or remnants... |
0806.3504 | Farook Rahaman | F. Rahaman and P. Ghosh | Gravitational field of domain wall in Lyra geometry | 11 pages, 6 figures; Submitted in Astrophysics and Space Science
after minor revision | Astrophys.SpaceSci.317:127-132,2008 | 10.1007/s10509-008-9866-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the domain wall with time dependent displacement
vectors based on Lyra geometry in normal gauge i.e. displacement vector $f^*_i
= [ \beta (t), 0,0,0]$. The field theoretic energy momentum tensor is
considered with zero pressure perpendicular to the wall. We find an exact
solutions of Einstein ... | [
{
"created": "Sat, 21 Jun 2008 09:29:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rahaman",
"F.",
""
],
[
"Ghosh",
"P.",
""
]
] | In this paper, we study the domain wall with time dependent displacement vectors based on Lyra geometry in normal gauge i.e. displacement vector $f^*_i = [ \beta (t), 0,0,0]$. The field theoretic energy momentum tensor is considered with zero pressure perpendicular to the wall. We find an exact solutions of Einstein eq... |
2407.05646 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s} | Can the induced increase in the angular velocity prevent the
overspinning of BTZ black holes? | Accepted to appear in European Physical Journal C | Eur. Phys. J. C (2024) 84:669 | 10.1140/epjc/s10052-024-13062-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previously we showed that nearly extremal Ba\~{n}ados-Teitelboim-Zanelli
(BTZ) black holes can be overspun by test bodies and fields, following the work
of Rocha and Cardoso for the extremal case. The naked singularities in AdS
space-times correspond to states rotating faster than light in the Ads/CFT
correspondence.... | [
{
"created": "Mon, 8 Jul 2024 06:16:18 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Düztaş",
"Koray",
""
]
] | Previously we showed that nearly extremal Ba\~{n}ados-Teitelboim-Zanelli (BTZ) black holes can be overspun by test bodies and fields, following the work of Rocha and Cardoso for the extremal case. The naked singularities in AdS space-times correspond to states rotating faster than light in the Ads/CFT correspondence. T... |
0911.1636 | Brian Dolan | Brian P. Dolan | Chiral fermions and torsion in the early Universe | 5 pages revtex4; error in v1 corrected. | Class.Quant.Grav.27:095010,2010; Erratum-ibid.27:249801,2010 | 10.1088/0264-9381/27/9/095010 10.1088/0264-9381/27/24/249801 | DIAS-STP-10-01 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Torsion arising from fermionic matter in the Einstein-Cartan formulation of
general relativity is considered in the context of Robertson-Walker geometries
and the early Universe. An ambiguity in the way torsion arising from hot
fermionic matter in chiral models should be implemented is highlighted and
discussed. In o... | [
{
"created": "Mon, 9 Nov 2009 11:15:33 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 2009 09:26:21 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Apr 2010 08:18:21 GMT",
"version": "v3"
}
] | 2010-12-06 | [
[
"Dolan",
"Brian P.",
""
]
] | Torsion arising from fermionic matter in the Einstein-Cartan formulation of general relativity is considered in the context of Robertson-Walker geometries and the early Universe. An ambiguity in the way torsion arising from hot fermionic matter in chiral models should be implemented is highlighted and discussed. In one... |
0912.0834 | Jo\~ao Lopes Costa | Jo\~ao Lopes Costa | On the classification of stationary electro-vacuum black holes | null | Class.Quant.Grav. 27 (2010) 035010 | 10.1088/0264-9381/27/3/035010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a classification of stationary, $I^+$--regular, non-degenerate and
analytic electro-vacuum space-times in terms of Weinstein solutions. In
particular, for connected horizons, we prove uniqueness of the Kerr-Newman
black holes.
| [
{
"created": "Fri, 4 Dec 2009 12:23:03 GMT",
"version": "v1"
}
] | 2012-06-21 | [
[
"Costa",
"João Lopes",
""
]
] | We obtain a classification of stationary, $I^+$--regular, non-degenerate and analytic electro-vacuum space-times in terms of Weinstein solutions. In particular, for connected horizons, we prove uniqueness of the Kerr-Newman black holes. |
1603.02554 | Luca Fabbri | Luca Fabbri | A generally-relativistic gauge classification of the Dirac fields | 7 pages | Int.J.Geom.Meth.Mod.Phys.:13,1650078(2016) | 10.1142/S021988781650078X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider generally-relativistic gauge transformations for the spinorial
fields finding two mutually exclusive but together exhaustive classes in which
fermions are placed adding supplementary information to the results obtained by
Lounesto, and identifying quantities analogous to the momentum vector and the
Pauli-... | [
{
"created": "Tue, 8 Mar 2016 15:36:35 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2016 13:04:59 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Jan 2017 01:33:49 GMT",
"version": "v3"
},
{
"created": "Mon, 22 May 2017 15:21:20 GMT",
"version": "v4"
}
] | 2017-05-23 | [
[
"Fabbri",
"Luca",
""
]
] | We consider generally-relativistic gauge transformations for the spinorial fields finding two mutually exclusive but together exhaustive classes in which fermions are placed adding supplementary information to the results obtained by Lounesto, and identifying quantities analogous to the momentum vector and the Pauli-Lu... |
2312.07127 | Yong Xiao | Yong Xiao and Yue-Ying Liu | First order corrections to black hole thermodynamics: a simple approach
enhanced | 6 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Perturbation theory plays an essential role in the realm of physics,
especially when it is difficult or impossible to obtain exact solutions.
Incorporating higher derivative terms into the gravitational action leads to an
important perturbation problem. In this paper, we demonstrate that the first
order corrections t... | [
{
"created": "Tue, 12 Dec 2023 10:00:08 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Feb 2024 10:00:51 GMT",
"version": "v2"
}
] | 2024-02-19 | [
[
"Xiao",
"Yong",
""
],
[
"Liu",
"Yue-Ying",
""
]
] | Perturbation theory plays an essential role in the realm of physics, especially when it is difficult or impossible to obtain exact solutions. Incorporating higher derivative terms into the gravitational action leads to an important perturbation problem. In this paper, we demonstrate that the first order corrections to ... |
1005.3306 | Lucia Santamaria | L. Santamaria, F. Ohme, P. Ajith, B. Bruegmann, N. Dorband, M. Hannam,
S. Husa, P. Moesta, D. Pollney, C. Reisswig, E. L. Robinson, J. Seiler and B.
Krishnan | Matching post-Newtonian and numerical relativity waveforms: systematic
errors and a new phenomenological model for non-precessing black hole
binaries | 22 pages, 11 figures | Phys.Rev.D82:064016,2010 | 10.1103/PhysRevD.82.064016 | LIGO-P1000048, AEI-2010-122 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new phenomenological gravitational waveform model for the
inspiral and coalescence of non-precessing spinning black hole binaries. Our
approach is based on a frequency domain matching of post-Newtonian inspiral
waveforms with numerical relativity based binary black hole coalescence
waveforms. We quantify... | [
{
"created": "Tue, 18 May 2010 20:00:07 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jun 2010 12:11:03 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Aug 2010 11:41:08 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Santamaria",
"L.",
""
],
[
"Ohme",
"F.",
""
],
[
"Ajith",
"P.",
""
],
[
"Bruegmann",
"B.",
""
],
[
"Dorband",
"N.",
""
],
[
"Hannam",
"M.",
""
],
[
"Husa",
"S.",
""
],
[
"Moesta",
"P.",
""
... | We present a new phenomenological gravitational waveform model for the inspiral and coalescence of non-precessing spinning black hole binaries. Our approach is based on a frequency domain matching of post-Newtonian inspiral waveforms with numerical relativity based binary black hole coalescence waveforms. We quantify t... |
1501.03524 | Hideki Maeda | Hideki Maeda | The Roberts-(A)dS spacetime | 8 pages, 7 figures, 1 table; v2, revised version, higher-dimensional
solution with k=0 given in appendix; v3, final version to appear in Classical
and Quantum Gravity | Class. Quant. Grav. 32, 135025 (2015) | 10.1088/0264-9381/32/13/135025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Global structure of the (anti-)de~Sitter ((A)dS) generalization of the
Roberts solution in general relativity with a massless scalar field and its
topological generalization is clarified. In the case with a negative
cosmological constant, the spacetime is asymptotically locally AdS and it
contains a black-hole event ... | [
{
"created": "Wed, 14 Jan 2015 21:51:10 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jan 2015 08:37:57 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jun 2015 08:47:42 GMT",
"version": "v3"
}
] | 2021-11-02 | [
[
"Maeda",
"Hideki",
""
]
] | Global structure of the (anti-)de~Sitter ((A)dS) generalization of the Roberts solution in general relativity with a massless scalar field and its topological generalization is clarified. In the case with a negative cosmological constant, the spacetime is asymptotically locally AdS and it contains a black-hole event ho... |
1307.3291 | Valeri Frolov P | Valeri P. Frolov | Generalized Fermat's principle and action for light rays in a curved
spacetime | 7 pages 1 figure | null | 10.1103/PhysRevD.88.064039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We start with formulation of the generalized Fermat's principle for light
propagation in a curved spacetime. We apply Pontryagin's minimum principle of
the optimal control theory and obtain an effective Hamiltonian for null
geodesics in a curved spacetime. We explicitly demonstrate that dynamical
equations for this H... | [
{
"created": "Thu, 11 Jul 2013 23:05:28 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Frolov",
"Valeri P.",
""
]
] | We start with formulation of the generalized Fermat's principle for light propagation in a curved spacetime. We apply Pontryagin's minimum principle of the optimal control theory and obtain an effective Hamiltonian for null geodesics in a curved spacetime. We explicitly demonstrate that dynamical equations for this Ham... |
2001.01806 | Albert Huber | Albert Huber | Distributional Metrics and the Action Principle of Einstein-Hilbert
Gravity | 22 Pages, no figures | Class. Quantum Grav. 2020 | 10.1088/1361-6382/ab7614 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, a subclass of the generalized Kerr-Schild class of spacetimes
is specified, with respect to which the Ricci tensor (regardless of the
position of indices) proves to be linear in the so-called profile function of
the geometry. Considering Colombeau's nonlinear theory of generalized
functions, this result... | [
{
"created": "Mon, 6 Jan 2020 22:49:36 GMT",
"version": "v1"
}
] | 2020-02-17 | [
[
"Huber",
"Albert",
""
]
] | In this work, a subclass of the generalized Kerr-Schild class of spacetimes is specified, with respect to which the Ricci tensor (regardless of the position of indices) proves to be linear in the so-called profile function of the geometry. Considering Colombeau's nonlinear theory of generalized functions, this result i... |
gr-qc/0406094 | Burkhard Kleihaus | B. Kleihaus, J. Kunz and F. Navarro-Lerida | Rotating Black Holes with Monopole Hair | 13 pages, 8 figures | Phys.Lett. B599 (2004) 294-300 | 10.1016/j.physletb.2004.08.046 | null | gr-qc | null | We study rotating black holes in Einstein-Yang-Mills-Higgs theory. These
black holes emerge from static black holes with monopole hair when a finite
horizon angular velocity is imposed. At critical values of the horizon angular
velocity and the horizon radius, they bifurcate with embedded Kerr-Newman black
holes. The... | [
{
"created": "Wed, 23 Jun 2004 16:03:05 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kleihaus",
"B.",
""
],
[
"Kunz",
"J.",
""
],
[
"Navarro-Lerida",
"F.",
""
]
] | We study rotating black holes in Einstein-Yang-Mills-Higgs theory. These black holes emerge from static black holes with monopole hair when a finite horizon angular velocity is imposed. At critical values of the horizon angular velocity and the horizon radius, they bifurcate with embedded Kerr-Newman black holes. The n... |
1306.6521 | Vladimir Ivashchuk | V. D. Ivashchuk and V. N. Melnikov | Quantum billiards in multidimensional models with fields of forms | 14 pages, LaTex, no figures, several typos are eliminated | Gravitation and Cosmology 19, No 3, 171-177 (2013) | 10.1134/S0202289313030055 | IGC-PFUR-13/07-01/10-02corr | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bianchi type I cosmological model in (n+1)-dimensional gravity with several
forms is considered. When the electric non-composite brane ansatz is adopted,
the Wheeler-DeWitt (WDW) equation for the model, written in a conformally
covariant form, is analyzed. Under certain restrictions, asymptotic solutions
to the WDW e... | [
{
"created": "Thu, 27 Jun 2013 14:44:17 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Jul 2013 11:15:04 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Oct 2013 21:51:50 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Sep 2014 15:16:38 GMT",
"version": "v4"
}
] | 2015-06-16 | [
[
"Ivashchuk",
"V. D.",
""
],
[
"Melnikov",
"V. N.",
""
]
] | Bianchi type I cosmological model in (n+1)-dimensional gravity with several forms is considered. When the electric non-composite brane ansatz is adopted, the Wheeler-DeWitt (WDW) equation for the model, written in a conformally covariant form, is analyzed. Under certain restrictions, asymptotic solutions to the WDW equ... |
1505.07760 | Francesco Becattini | F. Becattini, E. Grossi (University of Florence, Italy) | Quantum corrections to the stress-energy tensor in thermodynamic
equilibrium with acceleration | 18 pages, 1 figure. Minor changes, to appear in PRD | Phys. Rev. D 92, 045037 (2015) | 10.1103/PhysRevD.92.045037 | null | gr-qc hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the stress-energy tensor has additional terms with respect to
the ideal form in states of global thermodynamic equilibrium in flat spacetime
with non-vanishing acceleration and vorticity. These corrections are of quantum
origin and their leading terms are second order in the gradients of the
thermodynami... | [
{
"created": "Thu, 28 May 2015 17:14:22 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Aug 2015 12:05:38 GMT",
"version": "v2"
}
] | 2015-09-02 | [
[
"Becattini",
"F.",
"",
"University of Florence, Italy"
],
[
"Grossi",
"E.",
"",
"University of Florence, Italy"
]
] | We show that the stress-energy tensor has additional terms with respect to the ideal form in states of global thermodynamic equilibrium in flat spacetime with non-vanishing acceleration and vorticity. These corrections are of quantum origin and their leading terms are second order in the gradients of the thermodynamic ... |
1412.7323 | Maksym Tsizh | M. Tsizh, B. Novosyadlyj and Yu. Kulinich | Distribution of dark energy in the vicinity of compact objects | 5 pages, 2 figures; WDS'14 Proceedings of Contributed Papers | WDS'14 Proceedings of Contributed Papers - Physics, 21-25, 2014 | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The distribution of dark energy density in the vicinity of compact static
objects is analyzed. Dark energy is assumed to be in the form of a scalar field
with three parameters: the background density, the equation of state parameter
and the effective sound speed. Compact object is assumed to be a homogeneous
spherica... | [
{
"created": "Tue, 23 Dec 2014 11:20:07 GMT",
"version": "v1"
}
] | 2020-08-04 | [
[
"Tsizh",
"M.",
""
],
[
"Novosyadlyj",
"B.",
""
],
[
"Kulinich",
"Yu.",
""
]
] | The distribution of dark energy density in the vicinity of compact static objects is analyzed. Dark energy is assumed to be in the form of a scalar field with three parameters: the background density, the equation of state parameter and the effective sound speed. Compact object is assumed to be a homogeneous spherical ... |
1310.5038 | Rodrigo Maier | Rodrigo Maier, Francesco Pace and Ivano Dami\~ao Soares | Bounded Scalar Perturbations in Bouncing Brane World Cosmologies | 15 pages, 29 figures. Accepted for publication in Physical Review D | Phys. Rev. D 88, 106003 (2013) | 10.1103/PhysRevD.88.106003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the dynamics of scalar perturbations in closed
Friedmann-Lema\^itre-Robertson- Walker (FLRW) universes in the framework of
Brane World theory with a timelike extra dimension. In this scenario, the
unperturbed Friedmann equations contain additional terms arising from the
bulk-brane interaction that implemen... | [
{
"created": "Fri, 18 Oct 2013 14:38:39 GMT",
"version": "v1"
}
] | 2014-12-16 | [
[
"Maier",
"Rodrigo",
""
],
[
"Pace",
"Francesco",
""
],
[
"Soares",
"Ivano Damião",
""
]
] | We examine the dynamics of scalar perturbations in closed Friedmann-Lema\^itre-Robertson- Walker (FLRW) universes in the framework of Brane World theory with a timelike extra dimension. In this scenario, the unperturbed Friedmann equations contain additional terms arising from the bulk-brane interaction that implement ... |
2107.13893 | Kirill Bronnikov | Kirill A. Bronnikov, Sergey G. Rubin | Local regions with expanding extra dimensions | 8 pages, 2 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study possible spatial domains containing expanding extra dimensions. We
show that they are predicted in the framework of $f(R)$ gravity and could
appear due to quantum fluctuations during inflation. Their interior is
characterized by the multidimensional curvature ultimately tending to zero and
a slowly growing s... | [
{
"created": "Thu, 29 Jul 2021 10:56:17 GMT",
"version": "v1"
}
] | 2021-07-30 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Rubin",
"Sergey G.",
""
]
] | We study possible spatial domains containing expanding extra dimensions. We show that they are predicted in the framework of $f(R)$ gravity and could appear due to quantum fluctuations during inflation. Their interior is characterized by the multidimensional curvature ultimately tending to zero and a slowly growing siz... |
gr-qc/0109026 | Masaru Shibata | Masaru Shibata and Koji Uryu | Computation of gravitational waves from inspiraling binary neutron stars
in quasiequilibrium circular orbits : Formulation and calibration | 26 pages, to be published in PRD | Phys.Rev. D64 (2001) 104017 | 10.1103/PhysRevD.64.104017 | null | gr-qc | null | Gravitational waves from binary neutron stars in quasiequilibrium circular
orbits are computed using an approximate method which we propose in this paper.
In the first step of this method, we prepare general relativistic irrotational
binary neutron stars in a quasiequilibrium circular orbit, neglecting
gravitational ... | [
{
"created": "Fri, 7 Sep 2001 09:27:46 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Shibata",
"Masaru",
""
],
[
"Uryu",
"Koji",
""
]
] | Gravitational waves from binary neutron stars in quasiequilibrium circular orbits are computed using an approximate method which we propose in this paper. In the first step of this method, we prepare general relativistic irrotational binary neutron stars in a quasiequilibrium circular orbit, neglecting gravitational wa... |
gr-qc/0008069 | Francesco Fucito | F. Fucito | Deviations from Einstein's Gravity at Large and Short Distances | 15 pages, 1 figure, talk delivered at the congress: Gravitational
Waves: A Challenge to Theoretical Astrophysics, Trieste June 2000 Addition of
a reference | null | null | null | gr-qc hep-th | null | In this talk I will describe some recent results on the sensitivity of
resonant mass detectors shaped as a hollow sphere to scalar gravitational
radiation. Detection of this type of gravitational radiation will signal
deviations from Einstein's gravity at large distances. I will then discuss a
class of experiments ai... | [
{
"created": "Tue, 29 Aug 2000 11:48:03 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2000 08:21:45 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fucito",
"F.",
""
]
] | In this talk I will describe some recent results on the sensitivity of resonant mass detectors shaped as a hollow sphere to scalar gravitational radiation. Detection of this type of gravitational radiation will signal deviations from Einstein's gravity at large distances. I will then discuss a class of experiments aimi... |
1010.2585 | Dong-il Hwang | Dong-il Hwang and Dong-han Yeom | Internal structure of charged black holes | 32 pages, 23 figures | Phys. Rev. D 84, 064020 (2011) | 10.1103/PhysRevD.84.064020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the internal structure of charged black holes with a
spherically symmetric model in the double-null coordinate system. Hawking
radiation is considered using the S-wave approximation of semiclassical
back-reaction and discharge is simulated by supplying an oppositely charged
matter to the black hole. In... | [
{
"created": "Wed, 13 Oct 2010 07:23:32 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2011 20:00:38 GMT",
"version": "v2"
}
] | 2011-10-18 | [
[
"Hwang",
"Dong-il",
""
],
[
"Yeom",
"Dong-han",
""
]
] | We investigate the internal structure of charged black holes with a spherically symmetric model in the double-null coordinate system. Hawking radiation is considered using the S-wave approximation of semiclassical back-reaction and discharge is simulated by supplying an oppositely charged matter to the black hole. In t... |
2003.14016 | Arun Kumar | Arun Kumar, Dharm Veer Singh, and Sushant G. Ghosh | Hayward black holes in Einstein-Gauss-Bonnet gravity | null | Annals of Physics 2020 | 10.1016/j.aop.2020.168214 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hayward metric is a spherically symmetric charged regular black holes, a
modification of the Reisnner-Nordstr$\ddot{o}$m black holes of Einstein's
equations coupled to nonlinear electrodynamics. We consider
Einstein-Gauss-Bonnet gravity (EGB) coupled to nonlinear electrodynamics to
present an exact five dimension... | [
{
"created": "Tue, 31 Mar 2020 08:16:19 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2020 04:06:39 GMT",
"version": "v2"
}
] | 2020-06-03 | [
[
"Kumar",
"Arun",
""
],
[
"Singh",
"Dharm Veer",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | The Hayward metric is a spherically symmetric charged regular black holes, a modification of the Reisnner-Nordstr$\ddot{o}$m black holes of Einstein's equations coupled to nonlinear electrodynamics. We consider Einstein-Gauss-Bonnet gravity (EGB) coupled to nonlinear electrodynamics to present an exact five dimension (... |
2407.00484 | Yen Chin Ong | Hengxin Lu, Sofia Di Gennaro, Yen Chin Ong | Generalized Entropy Implies Varying-G: Horizon Area Dependent Field
Equations and Black Hole-Cosmology Coupling | Minor changes; also added/fixed some references | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When the Bekenstein-Hawking entropy is modified, ambiguity often arises
concerning whether the Hawking temperature or the thermodynamic mass should be
modified. The common practice, however, is to keep the black hole solution the
same as that in general relativity. On the other hand, if Jacobson's method of
deriving ... | [
{
"created": "Sat, 29 Jun 2024 16:15:55 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jul 2024 03:53:40 GMT",
"version": "v2"
}
] | 2024-07-16 | [
[
"Lu",
"Hengxin",
""
],
[
"Di Gennaro",
"Sofia",
""
],
[
"Ong",
"Yen Chin",
""
]
] | When the Bekenstein-Hawking entropy is modified, ambiguity often arises concerning whether the Hawking temperature or the thermodynamic mass should be modified. The common practice, however, is to keep the black hole solution the same as that in general relativity. On the other hand, if Jacobson's method of deriving Ei... |
gr-qc/0602001 | Theodore A. Jacobson | Christopher Eling, Raf Guedens, Ted Jacobson | Non-equilibrium Thermodynamics of Spacetime | 4 pages. Dedicated to Rafael Sorkin on the occasion of his 60th
birthday | Phys.Rev.Lett.96:121301,2006 | 10.1103/PhysRevLett.96.121301 | null | gr-qc cond-mat.stat-mech hep-th quant-ph | null | It has previously been shown that the Einstein equation can be derived from
the requirement that the Clausius relation dS = dQ/T hold for all local
acceleration horizons through each spacetime point, where dS is one quarter the
horizon area change in Planck units, and dQ and T are the energy flux across
the horizon a... | [
{
"created": "Wed, 1 Feb 2006 06:30:50 GMT",
"version": "v1"
}
] | 2011-05-05 | [
[
"Eling",
"Christopher",
""
],
[
"Guedens",
"Raf",
""
],
[
"Jacobson",
"Ted",
""
]
] | It has previously been shown that the Einstein equation can be derived from the requirement that the Clausius relation dS = dQ/T hold for all local acceleration horizons through each spacetime point, where dS is one quarter the horizon area change in Planck units, and dQ and T are the energy flux across the horizon and... |
gr-qc/9903085 | Modanese Giovanni | G. Modanese | Effect of a scale-dependent cosmological term on the motion of small
test particles in a Schwarzschild background | LaTeX, 13 pages | Nucl.Phys. B556 (1999) 397-408 | 10.1016/S0550-3213(99)00355-7 | ECT*-99-2 | gr-qc | null | It was recently suggested that the gravitational action could contain a
scale-dependent cosmological term, depending on the length or momentum scale
characteristic of the processes under consideration. In this work we explore a
simple possible consequence of this assumption. We compute the field generated
in empty sp... | [
{
"created": "Mon, 22 Mar 1999 19:13:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Modanese",
"G.",
""
]
] | It was recently suggested that the gravitational action could contain a scale-dependent cosmological term, depending on the length or momentum scale characteristic of the processes under consideration. In this work we explore a simple possible consequence of this assumption. We compute the field generated in empty spac... |
1904.12411 | Sijie Gao | Xiaobao Wang, Xiaoning Wu, Sijie Gao | Critical phenomena in gravitational collapse of Husain-Martinez-Nunez
scalar field | 14 pages, 6 figures | Eur.Phys.J.C (2019)79:823 | 10.1140/epjc/s10052-019-7340-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct analytical models to study the critical phenomena in
gravitational collapse of the Husain-Martinez-Nunez massless scalar field. We
first use the cut-and-paste technique to match the conformally flat solution
($c=0$ ) onto an outgoing Vaidya solution. To guarantee the continuity of the
metric and the extr... | [
{
"created": "Mon, 29 Apr 2019 01:00:46 GMT",
"version": "v1"
}
] | 2019-10-28 | [
[
"Wang",
"Xiaobao",
""
],
[
"Wu",
"Xiaoning",
""
],
[
"Gao",
"Sijie",
""
]
] | We construct analytical models to study the critical phenomena in gravitational collapse of the Husain-Martinez-Nunez massless scalar field. We first use the cut-and-paste technique to match the conformally flat solution ($c=0$ ) onto an outgoing Vaidya solution. To guarantee the continuity of the metric and the extrin... |
2402.17320 | Kamiel Janssens | Kamiel Janssens, Guillaume Boileau, Nelson Christensen, Nick van
Remortel, Francesca Badaracco, Benjamin Canuel, Alessandro Cardini, Andrea
Contu, Michael W. Coughlin, Jean-Baptiste Decitre, Rosario De Rosa, Matteo Di
Giovanni, Domenico D'Urso, St\'ephane Gaffet, Carlo Giunchi, Jan Harms,
Soumen Koley, Valentin... | Correlated 0.01Hz-40Hz seismic and Newtonian noise and its impact on
future gravitational-wave detectors | null | null | null | null | gr-qc astro-ph.IM physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report correlations in underground seismic measurements with horizontal
separations of several hundreds of meters to a few kilometers in the frequency
range 0.01Hz to 40Hz. These seismic correlations could threaten science goals
of planned interferometric gravitational-wave detectors such as the Einstein
Telescope... | [
{
"created": "Tue, 27 Feb 2024 08:52:32 GMT",
"version": "v1"
}
] | 2024-03-03 | [
[
"Janssens",
"Kamiel",
""
],
[
"Boileau",
"Guillaume",
""
],
[
"Christensen",
"Nelson",
""
],
[
"van Remortel",
"Nick",
""
],
[
"Badaracco",
"Francesca",
""
],
[
"Canuel",
"Benjamin",
""
],
[
"Cardini",
"Alessan... | We report correlations in underground seismic measurements with horizontal separations of several hundreds of meters to a few kilometers in the frequency range 0.01Hz to 40Hz. These seismic correlations could threaten science goals of planned interferometric gravitational-wave detectors such as the Einstein Telescope a... |
gr-qc/0612137 | Joao Faria Martins | Jo\~ao Faria Martins, Aleksandar Mikovic | Invariants of Spin Networks Embedded in Three-Manifolds | 29 pages, 9 figures; v2 small changes in the abstract | Commun.Math.Phys.279:381-399,2008 | 10.1007/s00220-008-0422-8 | null | gr-qc hep-th math-ph math.MP math.QA | null | We study the invariants of spin networks embedded in a three-dimensional
manifold which are based on the path integral for SU(2) BF-Theory. These
invariants appear naturally in Loop Quantum Gravity, and have been defined as
spin-foam state sums. By using the Chain-Mail technique, we give a more general
definition of ... | [
{
"created": "Thu, 21 Dec 2006 17:51:02 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Dec 2006 13:45:35 GMT",
"version": "v2"
}
] | 2017-05-23 | [
[
"Martins",
"João Faria",
""
],
[
"Mikovic",
"Aleksandar",
""
]
] | We study the invariants of spin networks embedded in a three-dimensional manifold which are based on the path integral for SU(2) BF-Theory. These invariants appear naturally in Loop Quantum Gravity, and have been defined as spin-foam state sums. By using the Chain-Mail technique, we give a more general definition of th... |
gr-qc/0104086 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | A phenomenological description of quantum-gravity-induced space-time
noise | 10 pages, LaTex, 1 figure. Short paper, omitting most technical
details. More detailed analysis was reported in gr-qc/0104005 | Nature 410:1065-1069,2001 | 10.1038/35074035 | null | gr-qc | null | I propose a phenomenological description of space-time foam and discuss the
experimental limits that are within reach of forthcoming experiments.
| [
{
"created": "Wed, 25 Apr 2001 20:29:10 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | I propose a phenomenological description of space-time foam and discuss the experimental limits that are within reach of forthcoming experiments. |
1811.10639 | Steffen Gielen | Steffen Gielen | Inhomogeneous universe from group field theory condensate | 25 pages, 2 figures, revtex; v2: added a few comments and references,
version accepted in JCAP | JCAP 1902 (2019) 013 | 10.1088/1475-7516/2019/02/013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the fundamental challenges for quantum cosmology is to explain the
emergence of our macroscopic Universe from physics at the Planck scale. In the
group field theory (GFT) approach to quantum gravity, such a macroscopic
universe results from the formation of a "condensate" of fundamentally discrete
degrees of f... | [
{
"created": "Mon, 26 Nov 2018 19:00:18 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2019 11:41:28 GMT",
"version": "v2"
}
] | 2019-02-12 | [
[
"Gielen",
"Steffen",
""
]
] | One of the fundamental challenges for quantum cosmology is to explain the emergence of our macroscopic Universe from physics at the Planck scale. In the group field theory (GFT) approach to quantum gravity, such a macroscopic universe results from the formation of a "condensate" of fundamentally discrete degrees of fre... |
1701.04330 | Yong Cai | Yong Cai, Hai-Guang Li, Taotao Qiu, Yun-Song Piao | The Effective Field Theory of nonsingular cosmology: II | 20 pages, 1 table, 9 figures; published in EPJC | Eur.Phys.J. C77 (2017) no.6, 369 | 10.1140/epjc/s10052-017-4938-y | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the Effective Field Theory (EFT) of cosmological perturbations, we
explicitly clarify the pathology in nonsingular cubic Galileon models and show
how to cure it in EFT with new insights into this issue. With the least set of
EFT operators that are capable to avoid instabilities in nonsingular
cosmologies, we... | [
{
"created": "Mon, 16 Jan 2017 15:33:43 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jun 2017 15:18:58 GMT",
"version": "v2"
}
] | 2017-06-13 | [
[
"Cai",
"Yong",
""
],
[
"Li",
"Hai-Guang",
""
],
[
"Qiu",
"Taotao",
""
],
[
"Piao",
"Yun-Song",
""
]
] | Based on the Effective Field Theory (EFT) of cosmological perturbations, we explicitly clarify the pathology in nonsingular cubic Galileon models and show how to cure it in EFT with new insights into this issue. With the least set of EFT operators that are capable to avoid instabilities in nonsingular cosmologies, we c... |
gr-qc/0612157 | Panayiotis Stavrinos | P.C.Stavrinos, A.P.Kouretsis, M.Stathakopoulos | Friedmann Robertson-Walker model in generalised metric space-time with
weak anisotropy | 21 pages- to appear in GRG | Gen.Rel.Grav.40:1403-1425,2008 | 10.1007/s10714-007-0540-1 | null | gr-qc | null | A generalized model of space-time is given, taking into consideration the
anisotropic structure of fields which are depended on the position and the
direction (velocity).In this framework a generalized FRW-metric the
Raychaudhouri and Friedmann equations are studied.A long range vector field of
cosmological origin is... | [
{
"created": "Sun, 24 Dec 2006 21:52:18 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2007 13:58:04 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Apr 2007 14:36:14 GMT",
"version": "v3"
},
{
"created": "Mon, 22 Oct 2007 18:18:27 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Stavrinos",
"P. C.",
""
],
[
"Kouretsis",
"A. P.",
""
],
[
"Stathakopoulos",
"M.",
""
]
] | A generalized model of space-time is given, taking into consideration the anisotropic structure of fields which are depended on the position and the direction (velocity).In this framework a generalized FRW-metric the Raychaudhouri and Friedmann equations are studied.A long range vector field of cosmological origin is c... |
0704.1567 | Ragab Gad | Ragab M. Gad and A. Fouad | Energy and Momentum Distributions of Kantowski and Sachs Space-time | 12 pages | Astrophys.SpaceSci.310:135-140,2007 | 10.1007/s10509-007-9488-6 | null | gr-qc | null | We use the Einstein, Bergmann-Thomson, Landau-Lifshitz and Papapetrou
energy-momentum complexes to calculate the energy and momentum distributions of
Kantowski and Sachs space-time. We show that the Einstein and Bergmann-Thomson
definitions furnish a consistent result for the energy distribution, but the
definition o... | [
{
"created": "Thu, 12 Apr 2007 11:53:55 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Apr 2007 10:42:58 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gad",
"Ragab M.",
""
],
[
"Fouad",
"A.",
""
]
] | We use the Einstein, Bergmann-Thomson, Landau-Lifshitz and Papapetrou energy-momentum complexes to calculate the energy and momentum distributions of Kantowski and Sachs space-time. We show that the Einstein and Bergmann-Thomson definitions furnish a consistent result for the energy distribution, but the definition of ... |
2407.21442 | Francesco Iacovelli | Francesco Iacovelli and Michele Maggiore | Gravitational-wave observations and primordial black holes | To appear in the book "Primordial Black Holes", ed. Chris Byrnes,
Gabriele Franciolini, Tomohiro Harada, Paolo Pani, Misao Sasaki; Springer
(2024) | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave observations have the potential of allowing the
identification of a population of merging primordial black-hole binaries. We
provide an overview of the capabilities of present and future GW detectors,
with a special emphasis on the perspective for observing quantities that are
signatures of a primo... | [
{
"created": "Wed, 31 Jul 2024 08:45:29 GMT",
"version": "v1"
}
] | 2024-08-01 | [
[
"Iacovelli",
"Francesco",
""
],
[
"Maggiore",
"Michele",
""
]
] | Gravitational-wave observations have the potential of allowing the identification of a population of merging primordial black-hole binaries. We provide an overview of the capabilities of present and future GW detectors, with a special emphasis on the perspective for observing quantities that are signatures of a primord... |
0903.2021 | Andrew Hamilton | Andrew J. S. Hamilton (JILA) | The interior structure of slowly rotating black holes | 2 figures | Class.Quant.Grav.26:165006,2009 | 10.1088/0264-9381/26/16/165006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The internal structure of a slowly rotating, charged black hole that is
undergoing mass inflation at its inner horizon is derived. The equations
governing the angular behavior decouple from the radial behavior, so all
conclusions regarding inflation in a spherical charged black hole carry through
unchanged for a slow... | [
{
"created": "Wed, 11 Mar 2009 18:02:52 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Hamilton",
"Andrew J. S.",
"",
"JILA"
]
] | The internal structure of a slowly rotating, charged black hole that is undergoing mass inflation at its inner horizon is derived. The equations governing the angular behavior decouple from the radial behavior, so all conclusions regarding inflation in a spherical charged black hole carry through unchanged for a slowly... |
2001.01462 | Cosmin Stachie | C. Stachie, T. Dal Canton, E. Burns, N. Christensen, R. Hamburg, M.
Briggs, J. Broida, A. Goldstein, F. Hayes, T. Littenberg, P. Shawhan, J.
Veitch, P. Veres, C. A. Wilson-Hodge | Search for Advanced LIGO Single Interferometer Compact Binary
Coalescence Signals in Coincidence with Gamma-Ray Events in Fermi-GBM | null | Class. Quantum Grav. 37 175001 (2020) | 10.1088/1361-6382/aba28a | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Presented is the description of a new and general method used to search for
$\gamma$-ray counterparts to gravitational-wave (GW) triggers. This method is
specifically applied to single GW detector triggers. Advanced LIGO data from
observing runs O1 and O2 were analyzed, thus each GW trigger comes from either
the LIGO... | [
{
"created": "Mon, 6 Jan 2020 10:09:38 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2020 13:18:58 GMT",
"version": "v2"
}
] | 2020-08-18 | [
[
"Stachie",
"C.",
""
],
[
"Canton",
"T. Dal",
""
],
[
"Burns",
"E.",
""
],
[
"Christensen",
"N.",
""
],
[
"Hamburg",
"R.",
""
],
[
"Briggs",
"M.",
""
],
[
"Broida",
"J.",
""
],
[
"Goldstein",
"A.... | Presented is the description of a new and general method used to search for $\gamma$-ray counterparts to gravitational-wave (GW) triggers. This method is specifically applied to single GW detector triggers. Advanced LIGO data from observing runs O1 and O2 were analyzed, thus each GW trigger comes from either the LIGO-L... |
gr-qc/9704059 | Bruce Bassett | Roy Maartens and Bruce A. Bassett | Gravito-electromagnetism | 14 pages. Version to appear in Class. Quant. Grav | Class.Quant.Grav.15:705,1998 | 10.1088/0264-9381/15/3/018 | null | gr-qc astro-ph hep-th | null | We develop and apply a fully covariant 1+3 electromagnetic analogy for
gravity. The free gravitational field is covariantly characterized by the Weyl
gravito-electric and gravito-magnetic spatial tensor fields, whose dynamical
equations are the Bianchi identities. Using a covariant generalization of
spatial vector al... | [
{
"created": "Tue, 22 Apr 1997 19:03:41 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Sep 1997 15:42:44 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jan 1998 01:19:06 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Maartens",
"Roy",
""
],
[
"Bassett",
"Bruce A.",
""
]
] | We develop and apply a fully covariant 1+3 electromagnetic analogy for gravity. The free gravitational field is covariantly characterized by the Weyl gravito-electric and gravito-magnetic spatial tensor fields, whose dynamical equations are the Bianchi identities. Using a covariant generalization of spatial vector alge... |
gr-qc/9910012 | Thomas Thiemann | T. Thiemann | Canonical quantization of a minisuperspace model for gravity using
self-dual variables | 4p, LATEX | Proceedings of the Cornelius Lanczos International Centenary
Conference, Raleigh, North Carolina, Dec. 12-17, 1993; J. D. Brown, M. T.
Chu, D. C. Ellison, R. J. Plemmons (Eds.), SIAM, Philadelphia, 1994 | null | null | gr-qc | null | The present article summarizes the work of the papers \cite{1} dealing with
the quantization of pure gravity and gravity coupled to a Maxwell field and a
cosmological constant in presence of spherical symmetry. The class of models
presented is intended as an interesting testing ground for the quantization of
full 3+1... | [
{
"created": "Mon, 4 Oct 1999 17:54:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thiemann",
"T.",
""
]
] | The present article summarizes the work of the papers \cite{1} dealing with the quantization of pure gravity and gravity coupled to a Maxwell field and a cosmological constant in presence of spherical symmetry. The class of models presented is intended as an interesting testing ground for the quantization of full 3+1 g... |
1010.3431 | Yury F. Pirogov | Yu.F.Pirogov and I.Yu.Polev | Dark halos built of scalar gravitons: numerical study | 11 pages. Report presented at The 16th Intern. Seminar on High Energy
Physics "Quarks-2010", Kolomna, Russia, 6 - 12 June, 2010 | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous article due to one of the present authors (YFP), an extension
to General Relativity, violating general covariance to the residual unimodular
one, was proposed. As a manifestation of such a violation, there appears the
(massive) scalar graviton in addition to the massless tensor one. The former
was propo... | [
{
"created": "Sun, 17 Oct 2010 17:45:25 GMT",
"version": "v1"
}
] | 2010-10-19 | [
[
"Pirogov",
"Yu. F.",
""
],
[
"Polev",
"I. Yu.",
""
]
] | In a previous article due to one of the present authors (YFP), an extension to General Relativity, violating general covariance to the residual unimodular one, was proposed. As a manifestation of such a violation, there appears the (massive) scalar graviton in addition to the massless tensor one. The former was propose... |
2407.07864 | Boran Yesilyurt | S. P. Miao (NCKU), N. C. Tsamis (U. of Crete), R. P. Woodard (U. of
Florida), B. Yesilyurt (U. of Florida) | The Third Structure Function | 17 pages, 5 Tables , uses LaTeX2e | null | null | CCTP-2024-8, UFIFT-QG-24-05 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We re-consider the graviton self-energy induced by a loop of massless,
minimally coupled scalars on de Sitter background. On flat space background it
can be represented as a sum of two tensor differential operators acting on
scalar structure functions. On a general background these tensor differential
operators can b... | [
{
"created": "Wed, 10 Jul 2024 17:26:21 GMT",
"version": "v1"
}
] | 2024-07-11 | [
[
"Miao",
"S. P.",
"",
"NCKU"
],
[
"Tsamis",
"N. C.",
"",
"U. of Crete"
],
[
"Woodard",
"R. P.",
"",
"U. of\n Florida"
],
[
"Yesilyurt",
"B.",
"",
"U. of Florida"
]
] | We re-consider the graviton self-energy induced by a loop of massless, minimally coupled scalars on de Sitter background. On flat space background it can be represented as a sum of two tensor differential operators acting on scalar structure functions. On a general background these tensor differential operators can be ... |
2010.04571 | Jinsong Yang | Jinsong Yang, Cong Zhang, Yongge Ma | Loop quantum cosmology from an alternative Hamiltonian. II. Including
the Lorentzian term | 12 pages, 5 figures | Phys. Rev. D 102, 084018 (2020) | 10.1103/PhysRevD.102.084018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scheme of using the Chern-Simons action to regularize the gravitational
Hamiltonian constraint is extended to including the Lorentzian term in the
$k=0$ cosmological model. The Euclidean term and the Lorenzian term are thus
regularized separately mimicking the treatment of full loop quantum gravity.
The new quant... | [
{
"created": "Fri, 9 Oct 2020 13:36:38 GMT",
"version": "v1"
}
] | 2020-10-12 | [
[
"Yang",
"Jinsong",
""
],
[
"Zhang",
"Cong",
""
],
[
"Ma",
"Yongge",
""
]
] | The scheme of using the Chern-Simons action to regularize the gravitational Hamiltonian constraint is extended to including the Lorentzian term in the $k=0$ cosmological model. The Euclidean term and the Lorenzian term are thus regularized separately mimicking the treatment of full loop quantum gravity. The new quantum... |
gr-qc/0608086 | David Finkelstein | David Ritz Finkelstein | Homotopy approach to quantum gravity | For International Journal of Theoretical Physics, Oberwolfach 2006
issue | Int.J.Theor.Phys.47:534-552,2008 | 10.1007/s10773-007-9479-y | null | gr-qc | null | I construct a finite-dimensional quantum theory from general relativity by a
homotopy method. Its quantum history is made up of at least two levels of
fermionic elements. Its unitary group has the diffeomorphism group as singular
limit. Its gravitational metrical form is the algebraic square. Its spinors are
multivec... | [
{
"created": "Fri, 18 Aug 2006 18:43:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Finkelstein",
"David Ritz",
""
]
] | I construct a finite-dimensional quantum theory from general relativity by a homotopy method. Its quantum history is made up of at least two levels of fermionic elements. Its unitary group has the diffeomorphism group as singular limit. Its gravitational metrical form is the algebraic square. Its spinors are multivecto... |
0904.0999 | Sam Dolan Dr | Luis C. B. Crispino, Sam R. Dolan and Ednilton S. Oliveira | Scattering of massless scalar waves by Reissner-Nordstr\"om black holes | 9 pages, 10 figures | Phys.Rev.D79:064022,2009 | 10.1103/PhysRevD.79.064022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of scattering of massless planar scalar waves by a charged
non-rotating black hole. Partial wave methods are applied to compute scattering
and absorption cross sections, for a range of incident wavelengths. We compare
our numerical results with semi-classical approximations from a geodesic
analysis... | [
{
"created": "Mon, 6 Apr 2009 20:02:58 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Crispino",
"Luis C. B.",
""
],
[
"Dolan",
"Sam R.",
""
],
[
"Oliveira",
"Ednilton S.",
""
]
] | We present a study of scattering of massless planar scalar waves by a charged non-rotating black hole. Partial wave methods are applied to compute scattering and absorption cross sections, for a range of incident wavelengths. We compare our numerical results with semi-classical approximations from a geodesic analysis, ... |
gr-qc/9601023 | Aharon Davidson | Aharon Davidson and Uzi Paz | Extensible Black Hole Embeddings for Apparently Forbidden Periodicities | 11 pages, RevTex file, 1 postcript figure | Foundations of Physics 30, 5 (2000) | 10.1023/A:1003793128801 | null | gr-qc hep-th | null | Imposing extendibility on Kasner-Fronsdal black hole local isometric
embedding is equivalent to removing conic singularities in Kruskal
representation. Allowing for globally non-trivial (living in $M_{5}\times
S_{1}$) embeddings, parameterized by $k$, extendibility can be achieved for
apparently forbidden frequencies... | [
{
"created": "Tue, 16 Jan 1996 12:12:25 GMT",
"version": "v1"
}
] | 2019-11-04 | [
[
"Davidson",
"Aharon",
""
],
[
"Paz",
"Uzi",
""
]
] | Imposing extendibility on Kasner-Fronsdal black hole local isometric embedding is equivalent to removing conic singularities in Kruskal representation. Allowing for globally non-trivial (living in $M_{5}\times S_{1}$) embeddings, parameterized by $k$, extendibility can be achieved for apparently forbidden frequencies $... |
1303.6157 | Yaser Tavakoli | Yaser Tavakoli, Joao Marto and Andrea Dapor | Semiclassical dynamics of horizons in spherically symmetric collapse | Version accepted in IJMPD | Int. J. Mod. Phys. D 23 (2014) 1450061 | 10.1142/S0218271814500618 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider a semiclassical description of the spherically
symmetric gravitational collapse with a massless scalar field. In particular,
we employ an effective scenario provided by holonomy corrections from loop
quantum gravity, to the homogeneous interior spacetime. The singularity that
would arise at ... | [
{
"created": "Mon, 25 Mar 2013 15:12:42 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Sep 2013 21:48:15 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Apr 2014 13:25:51 GMT",
"version": "v3"
}
] | 2014-05-21 | [
[
"Tavakoli",
"Yaser",
""
],
[
"Marto",
"Joao",
""
],
[
"Dapor",
"Andrea",
""
]
] | In this work, we consider a semiclassical description of the spherically symmetric gravitational collapse with a massless scalar field. In particular, we employ an effective scenario provided by holonomy corrections from loop quantum gravity, to the homogeneous interior spacetime. The singularity that would arise at th... |
gr-qc/0401093 | Juan Manuel Garcia-Islas | J.Manuel Garcia-Islas | Observables in 3-dimensional quantum gravity and topological invariants | 24 pages, 47 figures | Class.Quant.Grav. 21 (2004) 3933-3952 | 10.1088/0264-9381/21/16/008 | null | gr-qc hep-th | null | In this paper we report some results on the expectation values of a set of
observables introduced for 3-dimensional Riemannian quantum gravity with
positive cosmological constant, that is, observables in the Turaev-Viro model.
Instead of giving a formal description of the observables, we just formulate
the paper by e... | [
{
"created": "Wed, 21 Jan 2004 22:46:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Garcia-Islas",
"J. Manuel",
""
]
] | In this paper we report some results on the expectation values of a set of observables introduced for 3-dimensional Riemannian quantum gravity with positive cosmological constant, that is, observables in the Turaev-Viro model. Instead of giving a formal description of the observables, we just formulate the paper by exa... |
gr-qc/0511104 | Yun Soo Myung | Yun Soo Myung | Entanglement system, Casimir energy and black hole | 11 pages, no figure, version to appear in PLB | Phys.Lett. B636 (2006) 324-329 | 10.1016/j.physletb.2006.03.070 | INJE-TP-05-08 | gr-qc hep-th | null | We investigate the connection between the entanglement system in Minkowski
spacetime and the black hole using the scaling analysis. Here we show that the
entanglement system satisfies the Bekenstein entropy bound. Even though the
entropies of two systems are the same form, the entanglement energy is
different from th... | [
{
"created": "Thu, 17 Nov 2005 19:06:55 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2006 15:14:26 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Myung",
"Yun Soo",
""
]
] | We investigate the connection between the entanglement system in Minkowski spacetime and the black hole using the scaling analysis. Here we show that the entanglement system satisfies the Bekenstein entropy bound. Even though the entropies of two systems are the same form, the entanglement energy is different from the ... |
gr-qc/0012015 | Sawa Manoff | S. Manoff | Deviation equations of Synge and Schild over spaces with affine
connections and metrics | 15 pages, LaTeX. To appear in Intern. J. Mod. Phys. A | Int.J.Mod.Phys. A16 (2001) 1109-1122 | 10.1142/S0217751X01003068 | null | gr-qc | null | Deviation equation of Synge and Schild has been investigated over spaces with
affine connections and metrics. It is shown that the condition for the
vanishing of the Lie derivative of a vector field along a given non-null
(non-isotropic) vector field u for obtaining this equation is only a sufficient
(but not necessa... | [
{
"created": "Tue, 5 Dec 2000 07:31:44 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Manoff",
"S.",
""
]
] | Deviation equation of Synge and Schild has been investigated over spaces with affine connections and metrics. It is shown that the condition for the vanishing of the Lie derivative of a vector field along a given non-null (non-isotropic) vector field u for obtaining this equation is only a sufficient (but not necessary... |
1901.09870 | Christy Kelly | Christy Kelly, Carlo A Trugenberger and Fabio Biancalana | Self-Assembly of Geometric Space from Random Graphs | 26 pages, 9 figures, 2 appendices | Classical and Quantum Gravity, 2019 | 10.1088/1361-6382/ab1c7d | null | gr-qc cond-mat.stat-mech hep-th math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a Euclidean quantum gravity model in which random graphs
dynamically self-assemble into discrete manifold structures. Concretely, we
consider a statistical model driven by a discretisation of the Euclidean
Einstein-Hilbert action; contrary to previous approaches based on simplicial
complexes and Regge calc... | [
{
"created": "Mon, 28 Jan 2019 18:24:44 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2019 13:56:38 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Kelly",
"Christy",
""
],
[
"Trugenberger",
"Carlo A",
""
],
[
"Biancalana",
"Fabio",
""
]
] | We present a Euclidean quantum gravity model in which random graphs dynamically self-assemble into discrete manifold structures. Concretely, we consider a statistical model driven by a discretisation of the Euclidean Einstein-Hilbert action; contrary to previous approaches based on simplicial complexes and Regge calcul... |
2404.16981 | Giulio Neri | Giulio Neri and Stefano Liberati | Covariant phase space analysis of Lanczos-Lovelock gravity with
boundaries | 38 pages, 2 figures; references added, minor rephrasing | null | null | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | This work introduces a novel prescription for the expression of the
thermodynamic potentials associated with the couplings of a Lanczos-Lovelock
theory. These potentials emerge in theories with multiple couplings, where the
ratio between them provide intrinsic length scales that break scale invariance.
Our prescripti... | [
{
"created": "Thu, 25 Apr 2024 19:13:55 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2024 14:34:24 GMT",
"version": "v2"
}
] | 2024-05-15 | [
[
"Neri",
"Giulio",
""
],
[
"Liberati",
"Stefano",
""
]
] | This work introduces a novel prescription for the expression of the thermodynamic potentials associated with the couplings of a Lanczos-Lovelock theory. These potentials emerge in theories with multiple couplings, where the ratio between them provide intrinsic length scales that break scale invariance. Our prescription... |
0808.1687 | Mark D. Roberts | Mark D. Roberts | The Lanczos potential and Chern-Simons theory | 15 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new tensor $D$ is introduced which is constructed from the Lanczos
potential and is of the same form as that of the Weyl tensor $C$ expressed in
terms of the Lanczos potential except that covariant differentiation is
replaced by transvection with a vector $v$. The new tensor has associated
invariants $C\cdot D$ and... | [
{
"created": "Tue, 12 Aug 2008 15:48:33 GMT",
"version": "v1"
}
] | 2008-08-13 | [
[
"Roberts",
"Mark D.",
""
]
] | A new tensor $D$ is introduced which is constructed from the Lanczos potential and is of the same form as that of the Weyl tensor $C$ expressed in terms of the Lanczos potential except that covariant differentiation is replaced by transvection with a vector $v$. The new tensor has associated invariants $C\cdot D$ and $... |
1104.2218 | Cosimo Bambi | Cosimo Bambi | Compact objects with spin parameter $a_* > 1$ | 4 pages, 1 figure. Talk given at "46th Rencontres de Moriond:
Gravitational Waves and Experimental Gravity", 20 - 27 March 2011, La Thuile,
Aosta, Italy. To appear in the conference proceedings | null | null | IPMU11-0055 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 4-dimensional General Relativity, black holes are described by the Kerr
solution and are completely specified by their mass $M$ and by their spin
angular momentum $J$. A fundamental limit for a black hole in General
Relativity is the Kerr bound $|a_*| \le 1$, where $a_* = J/M^2$ is the spin
parameter. Future exper... | [
{
"created": "Tue, 12 Apr 2011 14:11:25 GMT",
"version": "v1"
}
] | 2011-04-13 | [
[
"Bambi",
"Cosimo",
""
]
] | In 4-dimensional General Relativity, black holes are described by the Kerr solution and are completely specified by their mass $M$ and by their spin angular momentum $J$. A fundamental limit for a black hole in General Relativity is the Kerr bound $|a_*| \le 1$, where $a_* = J/M^2$ is the spin parameter. Future experim... |
1008.5219 | Wen-Biao Han | Wen-Biao Han | Comment on "Is a Circular Orbit Possible According to General
Relativity?" (arXiv:1008.3553v1) | 4 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a comment on `` Is a Circular Orbit Possible According to General
Relativity?" by F. T. Hioe and D. Kuebel.
| [
{
"created": "Tue, 31 Aug 2010 05:19:19 GMT",
"version": "v1"
}
] | 2010-09-01 | [
[
"Han",
"Wen-Biao",
""
]
] | This is a comment on `` Is a Circular Orbit Possible According to General Relativity?" by F. T. Hioe and D. Kuebel. |
0809.2469 | Jakub Mielczarek | Jakub Mielczarek | Multi-fluid potential in the loop cosmology | 6 pages, 6 figures, new section on perturbations added. Version to
appear in PLB | Phys.Lett.B675:273-278,2009 | 10.1016/j.physletb.2009.04.034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scalar field can behave like a fluid with equation of state
$p_{\phi}=w\rho_{\phi}$, where $w \in [-1,1]$. In this Letter we derive a class
of the scalar field potentials for which $w=$ const. Scalar field with such a
potential can mimic ordinary matter, radiation, cosmic strings, etc. We perform
our calculations... | [
{
"created": "Mon, 15 Sep 2008 09:45:41 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Oct 2008 21:10:29 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Apr 2009 01:50:22 GMT",
"version": "v3"
}
] | 2011-03-28 | [
[
"Mielczarek",
"Jakub",
""
]
] | The scalar field can behave like a fluid with equation of state $p_{\phi}=w\rho_{\phi}$, where $w \in [-1,1]$. In this Letter we derive a class of the scalar field potentials for which $w=$ const. Scalar field with such a potential can mimic ordinary matter, radiation, cosmic strings, etc. We perform our calculations i... |
gr-qc/0103084 | Hans-Jurgen Matschull | Hans-Juergen Matschull | The Phase Space Structure of Multi Particle Models in 2+1 Gravity | 72 pages, LeTeX2e, 10 eps figures | Class.Quant.Grav.18:3497-3560,2001 | 10.1088/0264-9381/18/17/309 | MZ-TH/00-44 | gr-qc | null | What can we learn about quantum gravity from a simple toy model, without
actually quantizing it? The toy model consists of a finite number of point
particles, coupled to three dimensional Einstein gravity. It has finitely many
physical degrees of freedom. These are basically the relative positions of the
particles in... | [
{
"created": "Fri, 23 Mar 2001 02:49:41 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Matschull",
"Hans-Juergen",
""
]
] | What can we learn about quantum gravity from a simple toy model, without actually quantizing it? The toy model consists of a finite number of point particles, coupled to three dimensional Einstein gravity. It has finitely many physical degrees of freedom. These are basically the relative positions of the particles in s... |
2103.03119 | Benrong Mu | Jing Liang, Wei Lin and Benrong Mu | Joule-Thomson expansion of the torus-like black hole | 14 pages, 15 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study Joule-Thomson effects for the torus-like black hole.
The Joule-Thomson coefficients, the inversion curves and the isenthalpic curves
are studied. Furthermore, we investigate similarities and differences between
the Van der Waals fluid, the torus-like black hole and the charged AdS black
holes ... | [
{
"created": "Thu, 4 Mar 2021 15:45:56 GMT",
"version": "v1"
}
] | 2021-03-05 | [
[
"Liang",
"Jing",
""
],
[
"Lin",
"Wei",
""
],
[
"Mu",
"Benrong",
""
]
] | In this paper, we study Joule-Thomson effects for the torus-like black hole. The Joule-Thomson coefficients, the inversion curves and the isenthalpic curves are studied. Furthermore, we investigate similarities and differences between the Van der Waals fluid, the torus-like black hole and the charged AdS black holes fo... |
1701.01983 | Sharmanthie Fernando | Sharmanthie Fernando and Amanda Manning | Electromagnetic perturbations of a de Sitter black hole in massive
gravity | 25 pages, and 19 figures. Submitted to International Journal of
Modern Physics D | International Journal of Modern Physics D 26, no:10, 1750100
(2017) | 10.1142/S0218271817501000 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main purpose of this paper is to study quasinormal modes (QNM) of a black
hole in massive gravity with a positive cosmological constant due to
electromagnetic perturbations. A detailed study of the QNM frequencies for the
electromagnetic field is done by varying the parameters of the theory such as
the mass, scal... | [
{
"created": "Sun, 8 Jan 2017 16:56:50 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2017 16:38:40 GMT",
"version": "v2"
}
] | 2018-07-31 | [
[
"Fernando",
"Sharmanthie",
""
],
[
"Manning",
"Amanda",
""
]
] | The main purpose of this paper is to study quasinormal modes (QNM) of a black hole in massive gravity with a positive cosmological constant due to electromagnetic perturbations. A detailed study of the QNM frequencies for the electromagnetic field is done by varying the parameters of the theory such as the mass, scalar... |
0806.4183 | Eyo Ita III | Eyo Eyo Ita III | Instanton representation of Plebanski gravity XXII. Minisuperspace
quantization of gravity coupled to spin 1/2 fermionic fields | 21 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we carry out a quantization of gravity coupled to massless spin
1/2 fermions through the instanton representation of Plebanski gravity. We have
constructed a Hilbert space of states for this model, and we have computed the
Hamilton's equations of motion. The classical equations appear, at a
superficial ... | [
{
"created": "Wed, 25 Jun 2008 19:55:08 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jun 2008 11:39:35 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Dec 2009 16:20:37 GMT",
"version": "v3"
},
{
"created": "Mon, 12 Jul 2010 10:16:49 GMT",
"version": "v4"
}
] | 2010-07-13 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | In this paper we carry out a quantization of gravity coupled to massless spin 1/2 fermions through the instanton representation of Plebanski gravity. We have constructed a Hilbert space of states for this model, and we have computed the Hamilton's equations of motion. The classical equations appear, at a superficial le... |
2003.07092 | Karim Mosani | Karim Mosani, Dipanjan Dey, Pankaj S. Joshi | Global visibility of a strong curvature singularity in nonmarginally
bound dust collapse | null | Phys. Rev. D 102, 044037 (2020) | 10.1103/PhysRevD.102.044037 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate here the local versus global visibility of a space-time
singularity formed due to the gravitational collapse of a spherically symmetric
dust cloud having a non-zero velocity function. The conditions are investigated
that ensure the global visibility of the singularity, in the sense that the
outgoing nu... | [
{
"created": "Mon, 16 Mar 2020 10:07:22 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Aug 2020 12:06:32 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Mosani",
"Karim",
""
],
[
"Dey",
"Dipanjan",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We investigate here the local versus global visibility of a space-time singularity formed due to the gravitational collapse of a spherically symmetric dust cloud having a non-zero velocity function. The conditions are investigated that ensure the global visibility of the singularity, in the sense that the outgoing null... |
gr-qc/9406022 | P. Suntharothok-Priesmeyer | Clifford M. Will | Testing Scalar-Tensor Gravity with Gravitational-Wave Observations of
Inspiralling Compact Binaries | 10 pages, (3 figures upon request), WUGRAV-94-6 | Phys.Rev. D50 (1994) 6058-6067 | 10.1103/PhysRevD.50.6058 | null | gr-qc | null | Observations of gravitational waves from inspiralling compact binaries using
laser-interferometric detectors can provide accurate measures of parameters of
the source. They can also constrain alternative gravitation theories. We
analyse inspiralling compact %binaries in the context of the scalar-tensor
theory of Jord... | [
{
"created": "Wed, 15 Jun 1994 12:43:49 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Will",
"Clifford M.",
""
]
] | Observations of gravitational waves from inspiralling compact binaries using laser-interferometric detectors can provide accurate measures of parameters of the source. They can also constrain alternative gravitation theories. We analyse inspiralling compact %binaries in the context of the scalar-tensor theory of Jordan... |
2203.12124 | Yen-Kheng Lim PhD | Ziou Yang and Yen-Kheng Lim | Structure of test magnetic fields and charged particle motion around the
Hayward spacetime | 32 pages, 12 figures. Sec. 2 expanded, typos corrected | Phys. Rev. D 105, 124045 (2022) | 10.1103/PhysRevD.105.124045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A configuration of a test magnetic field in Hayward spacetime is obtained by
solving Maxwell's equation with the Hayward metric as the background. The
magnetic field lines show a dipole loop-like configuration in the regular
Hayward interior, and tends to an asymptotically uniform structure away from
the cylindrical ... | [
{
"created": "Wed, 23 Mar 2022 01:35:41 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2022 01:26:53 GMT",
"version": "v2"
}
] | 2022-06-24 | [
[
"Yang",
"Ziou",
""
],
[
"Lim",
"Yen-Kheng",
""
]
] | A configuration of a test magnetic field in Hayward spacetime is obtained by solving Maxwell's equation with the Hayward metric as the background. The magnetic field lines show a dipole loop-like configuration in the regular Hayward interior, and tends to an asymptotically uniform structure away from the cylindrical ax... |
2205.08320 | Pisin Chen | Pisin Chen, Misao Sasaki, Dong-han Yeom, Junggi Yoon | Resolving information loss paradox with Euclidean path integral | 12 pages, 3 figures | null | 10.1142/S0218271822420019 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The information loss paradox remains unresolved ever since Hawking's seminal
discovery of black hole evaporation. In this essay, we revisit the entanglement
entropy via Euclidean path integral (EPI) and allow for the branching of
semi-classical histories during the Lorentzian evolution. We posit that there
exist two ... | [
{
"created": "Tue, 17 May 2022 13:15:37 GMT",
"version": "v1"
}
] | 2022-09-16 | [
[
"Chen",
"Pisin",
""
],
[
"Sasaki",
"Misao",
""
],
[
"Yeom",
"Dong-han",
""
],
[
"Yoon",
"Junggi",
""
]
] | The information loss paradox remains unresolved ever since Hawking's seminal discovery of black hole evaporation. In this essay, we revisit the entanglement entropy via Euclidean path integral (EPI) and allow for the branching of semi-classical histories during the Lorentzian evolution. We posit that there exist two hi... |
2301.00156 | Spiros Cotsakis | Spiros Cotsakis and John Miritzis | Trans-Planckian censorship and spacetime singularities | v2: 11 pages, minor corrections, added references, matches published
version | Mathematics 11 (2023) 633 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of trans-planckian censorship conjecture (TCC) bounds on
geodesic completeness of spacetime and the associated existence for an infinite
proper time. Using Gronwall's lemma, TCC bounds can be derived directly,
leading to a result about the absence of blowup solutions. We show that the TCC
provide... | [
{
"created": "Sat, 31 Dec 2022 08:52:47 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2023 10:19:55 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Cotsakis",
"Spiros",
""
],
[
"Miritzis",
"John",
""
]
] | We study the effects of trans-planckian censorship conjecture (TCC) bounds on geodesic completeness of spacetime and the associated existence for an infinite proper time. Using Gronwall's lemma, TCC bounds can be derived directly, leading to a result about the absence of blowup solutions. We show that the TCC provides ... |
gr-qc/0611063 | Tao Mei | T. Mei | A New Variable in General Relativity and Its Applications for Classic
and Quantum Gravity | 28 pages, no figure | null | null | null | gr-qc | null | A new variable in the Riemannian geometry is introduced by the tetrad and the
Ricci's coefficients of rotation, the characters of curve of the Riemannian
geometry are determined completely by the new variable; for general relativity,
all the Einstein-Hilbert action, the Einstein equation in general relativity
and the... | [
{
"created": "Sat, 11 Nov 2006 19:35:11 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2006 09:17:26 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Nov 2006 09:16:01 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Dec 2006 06:16:38 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Mei",
"T.",
""
]
] | A new variable in the Riemannian geometry is introduced by the tetrad and the Ricci's coefficients of rotation, the characters of curve of the Riemannian geometry are determined completely by the new variable; for general relativity, all the Einstein-Hilbert action, the Einstein equation in general relativity and the D... |
0705.2478 | Yong-Wan Kim | Yun Soo Myung, Yong-Wan Kim, and Young-Jai Park | Entropy of an extremal regular black hole | 17 Pages, 4 figures, version to appear in Phys. Lett. B | Phys.Lett.B659:832-838,2008 | 10.1016/j.physletb.2007.12.007 | null | gr-qc hep-th | null | We introduce a magnetically charged extremal regular black hole in the
coupled system of Einstein gravity and nonlinear electrodynamics. Its near
horizon geometry is given by $AdS_2\times S^2$. It turns out that the entropy
function approach does not automatically lead to a correct entropy of the
Bekenstein-Hawking e... | [
{
"created": "Thu, 17 May 2007 05:38:08 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Dec 2007 03:13:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Myung",
"Yun Soo",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Park",
"Young-Jai",
""
]
] | We introduce a magnetically charged extremal regular black hole in the coupled system of Einstein gravity and nonlinear electrodynamics. Its near horizon geometry is given by $AdS_2\times S^2$. It turns out that the entropy function approach does not automatically lead to a correct entropy of the Bekenstein-Hawking ent... |
gr-qc/0202001 | Juan A. Valiente-Kroon | Juan A. Valiente Kroon | Polyhomogeneous expansions close to null and spatial infinity | 24 pages, 5 figures. To appear in: The Conformal Structure of
Spacetimes. Geometry, Analysis, Numerics. J. Frauendiner and H. Friedrich
eds. Springer | Lect.Notes Phys. 604 (2002) 135-160 | null | null | gr-qc | null | A study of the linearised gravitational field (spin 2 zero-rest-mass field)
on a Minkowski background close to spatial infinity is done. To this purpose, a
certain representation of spatial infinity in which it is depicted as a
cylinder is used. A first analysis shows that the solutions generically develop
a particul... | [
{
"created": "Fri, 1 Feb 2002 09:53:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kroon",
"Juan A. Valiente",
""
]
] | A study of the linearised gravitational field (spin 2 zero-rest-mass field) on a Minkowski background close to spatial infinity is done. To this purpose, a certain representation of spatial infinity in which it is depicted as a cylinder is used. A first analysis shows that the solutions generically develop a particular... |
1802.00860 | H\'ector Ra\'ul Olivares S\'anchez | Hector Olivares, Oliver Porth, Yosuke Mizuno | The Black Hole Accretion Code: adaptive mesh refinement and constrained
transport | 10 pages, 5 figures, submitted to the Proceedings of the 12th
International Conference on Numerical Modeling of Space Plasma Flows
(ASTRONUM-2017) | null | 10.1088/1742-6596/1031/1/012008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the forthcoming VLBI images of Sgr A* and M87, simulations of accretion
flows onto black holes acquire a special importance to aid with the
interpretation of the observations and to test the predictions of different
accretion scenarios, including those coming from alternative theories of
gravity. The Black Hole ... | [
{
"created": "Fri, 2 Feb 2018 21:44:15 GMT",
"version": "v1"
}
] | 2019-10-09 | [
[
"Olivares",
"Hector",
""
],
[
"Porth",
"Oliver",
""
],
[
"Mizuno",
"Yosuke",
""
]
] | With the forthcoming VLBI images of Sgr A* and M87, simulations of accretion flows onto black holes acquire a special importance to aid with the interpretation of the observations and to test the predictions of different accretion scenarios, including those coming from alternative theories of gravity. The Black Hole Ac... |
1901.03387 | Salvador Robles-Perez | Salvador J. Robles-Perez | Time reversal symmetry in cosmology and the creation of a
universe-antiuniverse pair | 9 pages, 3 figures. Minor changes and typos corrected, some
references added and Fig. 2 has been improved | Universe 2019, 5(6), 150 | 10.3390/universe5060150 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical evolution of the universe can be seen as a parametrised
worldline of the minisuperspace, with the time variable $t$ the parameter that
parametrises the worldline. The time reversal symmetry of the field equations
implies that for any positive oriented solution there can be a symmetric
negative oriented ... | [
{
"created": "Thu, 3 Jan 2019 07:14:53 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Oct 2019 10:44:38 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Oct 2019 07:27:00 GMT",
"version": "v3"
}
] | 2019-10-17 | [
[
"Robles-Perez",
"Salvador J.",
""
]
] | The classical evolution of the universe can be seen as a parametrised worldline of the minisuperspace, with the time variable $t$ the parameter that parametrises the worldline. The time reversal symmetry of the field equations implies that for any positive oriented solution there can be a symmetric negative oriented on... |
2108.06523 | Haryanto Siahaan | Haryanto M. Siahaan and Paulus C. Tjiang | Destroying Kaluza-Klein and Kerr-Newman black holes | 17 pages, 9 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the destroying of charged and rotating black holes in
Einstein-Maxwell-(dilaton) theory. We show that a test particle with some
appropriate properties in the black hole background can turn the black hole
into a naked singularity. In this work, we neglect the self-force, self-energy,
and radiative effec... | [
{
"created": "Sat, 14 Aug 2021 12:23:11 GMT",
"version": "v1"
}
] | 2021-08-17 | [
[
"Siahaan",
"Haryanto M.",
""
],
[
"Tjiang",
"Paulus C.",
""
]
] | We investigate the destroying of charged and rotating black holes in Einstein-Maxwell-(dilaton) theory. We show that a test particle with some appropriate properties in the black hole background can turn the black hole into a naked singularity. In this work, we neglect the self-force, self-energy, and radiative effects... |
0711.4620 | Jose M. Martin-Garcia | Carsten Gundlach, Jose M. Martin-Garcia | Critical phenomena in gravitational collapse | 51 pages, 5 figures. Major update of Living Rev. Rel. 2 (1999) 4 | LivingRev.Rel.10:5,2007 | 10.12942/lrr-2007-5 | null | gr-qc | null | As first discovered by Choptuik, the black hole threshold in the space of
initial data for general relativity shows both surprising structure and
surprising simplicity. Universality, power-law scaling of the black hole mass,
and scale echoing have given rise to the term "critical phenomena". They are
explained by the... | [
{
"created": "Wed, 28 Nov 2007 23:27:15 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Gundlach",
"Carsten",
""
],
[
"Martin-Garcia",
"Jose M.",
""
]
] | As first discovered by Choptuik, the black hole threshold in the space of initial data for general relativity shows both surprising structure and surprising simplicity. Universality, power-law scaling of the black hole mass, and scale echoing have given rise to the term "critical phenomena". They are explained by the e... |
1603.08600 | Baocheng Zhang | Baocheng Zhang | The mass formula for an exotic BTZ black hole | null | Annals of Physics 367 (2016) 280-287 | 10.1016/j.aop.2016.01.021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exotic Banados-Teitelboim-Zanelli (BTZ) black hole has an angular momentum
larger than its mass in three dimension (3D), which suggests the possibility
that cosmic censorship could be violated if angular momentum is extracted by
the Penrose process. In this paper, we propose a mass formula for the exotic
BTZ black... | [
{
"created": "Tue, 29 Mar 2016 00:51:07 GMT",
"version": "v1"
}
] | 2016-03-30 | [
[
"Zhang",
"Baocheng",
""
]
] | An exotic Banados-Teitelboim-Zanelli (BTZ) black hole has an angular momentum larger than its mass in three dimension (3D), which suggests the possibility that cosmic censorship could be violated if angular momentum is extracted by the Penrose process. In this paper, we propose a mass formula for the exotic BTZ black h... |
1105.3607 | Mariusz Dabrowski P. | Mariusz P. Dabrowski | Spacetime averaging of exotic singularity universes | 5 pages, no figures, REVTEX4-1, minor improvements | Phys.Lett.B702:320-323,2011 | 10.1016/j.physletb.2011.07.043 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Taking a spacetime average as a measure of the strength of singularities we
show that big-rips (type I) are stronger than big-bangs. The former have
infinite spacetime averages while the latter have them equal to zero. The
sudden future singularities (type II) and $w-$singularities (type V) have
finite spacetime aver... | [
{
"created": "Wed, 18 May 2011 12:38:43 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2011 05:52:59 GMT",
"version": "v2"
}
] | 2011-09-28 | [
[
"Dabrowski",
"Mariusz P.",
""
]
] | Taking a spacetime average as a measure of the strength of singularities we show that big-rips (type I) are stronger than big-bangs. The former have infinite spacetime averages while the latter have them equal to zero. The sudden future singularities (type II) and $w-$singularities (type V) have finite spacetime averag... |
1203.6084 | Mahouton J. Stephane Houndjo Dr | M. J. S. Houndjo, C. E. M. Batista, J. P. Campos, O. F. Piattella | Finite-time singularities in f(R, T) gravity and the effect of conformal
anomaly | 18 pages; Accepted for publication in Canadian Journal of Physics
(CJP) | Can. J. Phys. 91(7), 548-553 (2013) | 10.1139/cjp-2013-0023 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate $f(R,T)$ gravity models ($R$ is the curvature scalar and $T$
is the trace of the stress-energy tensor of ordinary matter) that are able to
reproduce the four known types of future finite-time singularities. We choose a
suitable expression for the Hubble parameter in order to realise the cosmic
accelera... | [
{
"created": "Tue, 27 Mar 2012 20:33:01 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Mar 2013 11:35:23 GMT",
"version": "v2"
}
] | 2013-08-06 | [
[
"Houndjo",
"M. J. S.",
""
],
[
"Batista",
"C. E. M.",
""
],
[
"Campos",
"J. P.",
""
],
[
"Piattella",
"O. F.",
""
]
] | We investigate $f(R,T)$ gravity models ($R$ is the curvature scalar and $T$ is the trace of the stress-energy tensor of ordinary matter) that are able to reproduce the four known types of future finite-time singularities. We choose a suitable expression for the Hubble parameter in order to realise the cosmic accelerati... |
1812.02758 | Giuseppe Ficarra | Giuseppe Ficarra, Paolo Pani and Helvi Witek | Impact of multiple modes on the black-hole superradiant instability | 21 pages, 12 figures; matches version accepted in PRD | Phys. Rev. D 99, 104019 (2019) | 10.1103/PhysRevD.99.104019 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight bosonic fields in the mass range $\sim (10^{-20}-10^{-11})\,{\rm
eV}$ can trigger a superradiant instability that extracts energy and angular
momentum from an astrophysical black hole with mass $M\sim(5,10^{10})M_\odot$,
forming a nonspherical, rotating condensate around it. So far, most studies of
the evo... | [
{
"created": "Thu, 6 Dec 2018 19:01:49 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2019 21:42:16 GMT",
"version": "v2"
}
] | 2019-09-23 | [
[
"Ficarra",
"Giuseppe",
""
],
[
"Pani",
"Paolo",
""
],
[
"Witek",
"Helvi",
""
]
] | Ultralight bosonic fields in the mass range $\sim (10^{-20}-10^{-11})\,{\rm eV}$ can trigger a superradiant instability that extracts energy and angular momentum from an astrophysical black hole with mass $M\sim(5,10^{10})M_\odot$, forming a nonspherical, rotating condensate around it. So far, most studies of the evolu... |
2105.04687 | Pedro Fernandes | Pedro G. S. Fernandes | Gravity with a generalized conformal scalar field: Theory and solutions | 7 pages, 1 ancillary file. V2: References added and typo corrected.
Published in Physical Review D | Phys. Rev. D 103, 104065 (2021) | 10.1103/PhysRevD.103.104065 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We naturally extend the theory of gravity with a conformally coupled scalar
field by only requiring conformal invariance of the scalar field equation of
motion and not of the action. The classically extended theory incorporates a
scalar-Gauss-Bonnet sector and has second-order equations of motion, belonging
to the Ho... | [
{
"created": "Mon, 10 May 2021 22:01:32 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 2021 14:25:54 GMT",
"version": "v2"
}
] | 2021-06-07 | [
[
"Fernandes",
"Pedro G. S.",
""
]
] | We naturally extend the theory of gravity with a conformally coupled scalar field by only requiring conformal invariance of the scalar field equation of motion and not of the action. The classically extended theory incorporates a scalar-Gauss-Bonnet sector and has second-order equations of motion, belonging to the Horn... |
1609.06817 | Wen-Biao Han | Wen-Biao Han | Fast Evolution and Waveform Generator for Extreme-Mass-Ratio Inspirals
in Equatorial-Circular Orbits | 19 pages, 18 figures, 4 tables | Class. Quantum Grav. 33 (2016) 065009 | 10.1088/0264-9381/33/6/065009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we discuss the development of a fast and accurate waveform
model for the quasi-circular orbital evolution of extreme-mass-ratio-inspirals
(EMRIs). This model simply employs the data of a few numerical Teukoulsky-based
energy fluxes and waveforms to fit out a set of polynomials for the entire
fluxes and ... | [
{
"created": "Thu, 22 Sep 2016 04:28:36 GMT",
"version": "v1"
}
] | 2016-09-23 | [
[
"Han",
"Wen-Biao",
""
]
] | In this paper we discuss the development of a fast and accurate waveform model for the quasi-circular orbital evolution of extreme-mass-ratio-inspirals (EMRIs). This model simply employs the data of a few numerical Teukoulsky-based energy fluxes and waveforms to fit out a set of polynomials for the entire fluxes and wa... |
2306.02423 | Marko Stojanovic | Marko Stojanovic, Neven Bilic, Dragoljub D. Dimitrijevic, Goran S.
Djordjevic, Milan Milosevic | Tachyon constant-roll inflation in Randall-Sundrum II cosmology | null | IJMPA 38, 2343003 (2023) | 10.1142/S0217751X23430030 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We study inflation in a model with constant second slow-roll parameter
$\eta$. In this case, the Hubble expansion rate equation has analytical
solutions describing four possible, nontrivial inflation scenarios. The
evolution of the inflaton governed by a tachyon field is studied in the
framework of the standard and R... | [
{
"created": "Sun, 4 Jun 2023 17:55:05 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2023 12:22:53 GMT",
"version": "v2"
}
] | 2024-07-03 | [
[
"Stojanovic",
"Marko",
""
],
[
"Bilic",
"Neven",
""
],
[
"Dimitrijevic",
"Dragoljub D.",
""
],
[
"Djordjevic",
"Goran S.",
""
],
[
"Milosevic",
"Milan",
""
]
] | We study inflation in a model with constant second slow-roll parameter $\eta$. In this case, the Hubble expansion rate equation has analytical solutions describing four possible, nontrivial inflation scenarios. The evolution of the inflaton governed by a tachyon field is studied in the framework of the standard and Ran... |
1607.01934 | Clemens S\"amann | Clemens S\"amann, Roland Steinbauer, Robert \v{S}varc | Completeness of general pp-wave spacetimes and their impulsive limit | 26 pages, 3 figures | 2016 Class. Quantum Grav. 33 215006 | 10.1088/0264-9381/33/21/215006 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate geodesic completeness in the full family of pp-wave or
Brinkmann spacetimes in their extended as well as in their impulsive form. This
class of geometries contains the recently studied gyratonic pp-waves, modelling
the exterior field of a spinning beam of null particles, as well as NPWs, which
generali... | [
{
"created": "Thu, 7 Jul 2016 09:31:59 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jul 2016 07:24:27 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Oct 2016 17:07:38 GMT",
"version": "v3"
}
] | 2016-10-18 | [
[
"Sämann",
"Clemens",
""
],
[
"Steinbauer",
"Roland",
""
],
[
"Švarc",
"Robert",
""
]
] | We investigate geodesic completeness in the full family of pp-wave or Brinkmann spacetimes in their extended as well as in their impulsive form. This class of geometries contains the recently studied gyratonic pp-waves, modelling the exterior field of a spinning beam of null particles, as well as NPWs, which generalise... |
gr-qc/0404058 | Tomislav Prokopec | Bjorn Garbrecht, Tomislav Prokopec (Heidelberg University) | Unruh response functions for scalar fields in de Sitter space | 16 pages, 1 figure, accepted for publication by Classical and Quantum
Gravity | Class.Quant.Grav. 21 (2004) 4993-5004 | 10.1088/0264-9381/21/21/016 | HD-THEP-04-11 | gr-qc astro-ph hep-th | null | We calculate the response functions of a freely falling Unruh detector in de
Sitter space coupled to scalar fields of different coupling to the curvature,
including the minimally coupled massless case. Although the responses differ
strongly in the infrared as a consequence of the amplification of superhorizon
modes, ... | [
{
"created": "Tue, 13 Apr 2004 11:14:48 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Oct 2004 15:01:58 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Garbrecht",
"Bjorn",
"",
"Heidelberg University"
],
[
"Prokopec",
"Tomislav",
"",
"Heidelberg University"
]
] | We calculate the response functions of a freely falling Unruh detector in de Sitter space coupled to scalar fields of different coupling to the curvature, including the minimally coupled massless case. Although the responses differ strongly in the infrared as a consequence of the amplification of superhorizon modes, th... |
0810.0078 | Yun Soo Myung | Yun Soo Myung, Myungseok Yoon | Regular black hole in three dimensions | 15 pages, 16 figures, 3D noncommutative black hole included as Sec 4,
a version to appear in EPJC | Eur.Phys.J.C62:405-411,2009 | 10.1140/epjc/s10052-009-1036-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find a new black hole in three dimensional anti-de Sitter space by
introducing an anisotropic perfect fluid inspired by the noncommutative black
hole. This is a regular black hole with two horizons. We compare thermodynamics
of this black hole with that of non-rotating BTZ black hole. The first-law of
thermodynami... | [
{
"created": "Wed, 1 Oct 2008 06:13:42 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Apr 2009 02:06:13 GMT",
"version": "v2"
}
] | 2009-07-24 | [
[
"Myung",
"Yun Soo",
""
],
[
"Yoon",
"Myungseok",
""
]
] | We find a new black hole in three dimensional anti-de Sitter space by introducing an anisotropic perfect fluid inspired by the noncommutative black hole. This is a regular black hole with two horizons. We compare thermodynamics of this black hole with that of non-rotating BTZ black hole. The first-law of thermodynamics... |
0906.2520 | Slava G. Turyshev | Slava G. Turyshev | Testing Relativistic Gravity from Space | 5 pages, 3 figures, invited talk at the IAU Symposium 261 "Relativity
in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis", 27
April - 1 May 2009, Virginia Beach, VA, USA | in ``Relativity in Fundamental Astronomy: Dynamics, Reference
Frames, and Data Analysis'', eds. S.A. Klioner, P.K. Seidelmann, M.H.
Soffel., pp. 204-208 (Cambridge University Press, 2010) | 10.1017/S1743921309990408 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent experiments have successfully tested Einstein's general theory of
relativity to remarkable precision. We discuss recent progress in the tests of
relativistic gravity in the solar system and present motivations for the new
generation of high-accuracy gravitational experiments. We especially focus on
the concept... | [
{
"created": "Sun, 14 Jun 2009 08:37:52 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2009 19:59:23 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Turyshev",
"Slava G.",
""
]
] | Recent experiments have successfully tested Einstein's general theory of relativity to remarkable precision. We discuss recent progress in the tests of relativistic gravity in the solar system and present motivations for the new generation of high-accuracy gravitational experiments. We especially focus on the concepts ... |
1611.04545 | Nihan Kat{\i}rc{\i} | Ozgur Akarsu, Metin Arik, Nihan Katirci | Inflation and late time acceleration designed by Stueckelberg massive
photon | Invited review; matches the version to appear in Foundations of
Physics; 25 pages, 1 figure | Found. Phys. 47 (2017) 769-796 | 10.1007/s10701-016-0059-y | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a mini review of the Stueckelberg mechanism, which was proposed to
make the abelian gauge theories massive as an alternative to Higgs mechanism,
within the framework of Minkowski as well as curved spacetimes. The higher the
scale the tighter the bounds on the photon mass, which might be gained via the
Stue... | [
{
"created": "Mon, 14 Nov 2016 20:06:31 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jan 2017 14:07:35 GMT",
"version": "v2"
}
] | 2018-09-28 | [
[
"Akarsu",
"Ozgur",
""
],
[
"Arik",
"Metin",
""
],
[
"Katirci",
"Nihan",
""
]
] | We present a mini review of the Stueckelberg mechanism, which was proposed to make the abelian gauge theories massive as an alternative to Higgs mechanism, within the framework of Minkowski as well as curved spacetimes. The higher the scale the tighter the bounds on the photon mass, which might be gained via the Stueck... |
1501.03806 | Emil Mottola | Pawel O. Mazur and Emil Mottola | Surface Tension and Negative Pressure Interior of a Non-Singular `Black
Hole' | 45 pages, 10 figures, Dedicated to Professor Andrzej Staruszkiewicz
on the occasion of his 75th birthday | null | 10.1088/0264-9381/32/21/215024 | LA-UR-15-20030 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The constant density interior Schwarzschild solution for a static,
spherically symmetric collapsed star has a divergent pressure when its radius
$R\le\frac{9}{8}R_s=\frac{9}{4}GM$. We show that this divergence is integrable,
and induces a non-isotropic transverse stress with a finite redshifted surface
tension on a s... | [
{
"created": "Thu, 15 Jan 2015 20:47:02 GMT",
"version": "v1"
}
] | 2015-10-21 | [
[
"Mazur",
"Pawel O.",
""
],
[
"Mottola",
"Emil",
""
]
] | The constant density interior Schwarzschild solution for a static, spherically symmetric collapsed star has a divergent pressure when its radius $R\le\frac{9}{8}R_s=\frac{9}{4}GM$. We show that this divergence is integrable, and induces a non-isotropic transverse stress with a finite redshifted surface tension on a sph... |
2105.07813 | Sarmistha Banik | K Nobleson, Tuhin Malik and Sarmistha Banik | Tidal deformability of neutron stars with exotic particles within a
density dependent relativistic mean field model in R-squared gravity | 4 figures. arXiv admin note: text overlap with arXiv:1803.09534 by
other authors | JCAP08(2021)012 | 10.1088/1475-7516/2021/08/012 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | There is a growing interest in investigating modified theories of gravity,
primarily, with the aim of explaining the universe's accelerated expansion,
which has been confirmed by several independent observations. Compact objects,
like neutron stars, exhibit strong gravity effects and therefore are used to
study modif... | [
{
"created": "Thu, 13 May 2021 21:06:35 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 2021 08:04:34 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Jul 2021 16:23:12 GMT",
"version": "v3"
}
] | 2021-08-16 | [
[
"Nobleson",
"K",
""
],
[
"Malik",
"Tuhin",
""
],
[
"Banik",
"Sarmistha",
""
]
] | There is a growing interest in investigating modified theories of gravity, primarily, with the aim of explaining the universe's accelerated expansion, which has been confirmed by several independent observations. Compact objects, like neutron stars, exhibit strong gravity effects and therefore are used to study modifie... |
gr-qc/0406056 | C. S. Unnikrishnan | C. S. Unnikrishnan (Tata Institute, Mumbai) | Casimir Energy Density at Planck Time: Cosmic Coincidence or Double
Solution to the Cosmological Dark Energy Problem? | LaTex, 12 pt. 5 pages | null | null | null | gr-qc astro-ph | null | The Casimir energy density calculated for a spherical shell of radius equal
to the size of the Universe projected back to the Planck time is almost equal
to the present day critical density. Is it just a coincidence, or is it a
solution to the `cosmic dark energy' and the `cosmic coincidence' problems? The
correspond... | [
{
"created": "Sun, 13 Jun 2004 17:48:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Unnikrishnan",
"C. S.",
"",
"Tata Institute, Mumbai"
]
] | The Casimir energy density calculated for a spherical shell of radius equal to the size of the Universe projected back to the Planck time is almost equal to the present day critical density. Is it just a coincidence, or is it a solution to the `cosmic dark energy' and the `cosmic coincidence' problems? The corresponden... |
2212.00675 | Quentin Vigneron | Quentin Vigneron, Vivian Poulin | Is expansion blind to the spatial curvature? | 22+4 pages, 2 figures, 2 tables. Accepted for publication in Physical
Review D | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In [arXiv:2204.13980], we proposed and motivated a modification of the
Einstein equation as a function of the topology of the Universe in the form of
a bi-connection theory. The new equation features an additional "topological
term" related to a second non-dynamical reference connection and chosen as a
function of th... | [
{
"created": "Thu, 1 Dec 2022 17:30:57 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 19:22:38 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Oct 2023 14:55:20 GMT",
"version": "v3"
}
] | 2023-11-01 | [
[
"Vigneron",
"Quentin",
""
],
[
"Poulin",
"Vivian",
""
]
] | In [arXiv:2204.13980], we proposed and motivated a modification of the Einstein equation as a function of the topology of the Universe in the form of a bi-connection theory. The new equation features an additional "topological term" related to a second non-dynamical reference connection and chosen as a function of the ... |
1104.4062 | Jorge A. Rueda | Jorge A. Rueda, R. Ruffini, S.-S. Xue | The Klein first integrals in an equilibrium system with electromagnetic,
weak, strong and gravitational interactions | To be published by Nuclear Physics A | Nuclear Physics A, Volume 872, Issue 1, 286-295 (2011) | 10.1016/j.nuclphysa.2011.09.005 | null | gr-qc astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The isothermal Tolman condition and the constancy of the Klein potentials
originally expressed for the sole gravitational interaction in a single fluid
are here generalized to the case of a three quantum fermion fluid duly taking
into account the strong, electromagnetic, weak and gravitational interactions.
The set o... | [
{
"created": "Wed, 20 Apr 2011 15:45:27 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2011 16:50:20 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jun 2011 08:32:16 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Aug 2011 17:58:06 GMT",
"version": "v4"
},
{
"c... | 2012-06-01 | [
[
"Rueda",
"Jorge A.",
""
],
[
"Ruffini",
"R.",
""
],
[
"Xue",
"S. -S.",
""
]
] | The isothermal Tolman condition and the constancy of the Klein potentials originally expressed for the sole gravitational interaction in a single fluid are here generalized to the case of a three quantum fermion fluid duly taking into account the strong, electromagnetic, weak and gravitational interactions. The set of ... |
2210.04425 | Vladimir Folomeev | Vladimir Dzhunushaliev, Vladimir Folomeev, Burkhard Kleihaus, and
Jutta Kunz | Mixed neutron-star-plus-wormhole systems: Rotating configurations | 10 pages, 1 figure, minor corrections to content, version published
in PRD | Phys. Rev. D 107, 044060 (2023) | 10.1103/PhysRevD.107.044060 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present rapidly rotating neutron stars featuring wormholes in their
centers. They arise in general relativity in the presence of a ghost scalar
field. The nuclear matter is described by a polytropic equation of state,
yielding realistic masses and radii for the neutron stars. The wormholes
possess small circumfere... | [
{
"created": "Mon, 10 Oct 2022 04:02:43 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Feb 2023 10:43:57 GMT",
"version": "v2"
}
] | 2023-02-28 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | We present rapidly rotating neutron stars featuring wormholes in their centers. They arise in general relativity in the presence of a ghost scalar field. The nuclear matter is described by a polytropic equation of state, yielding realistic masses and radii for the neutron stars. The wormholes possess small circumferent... |
gr-qc/9904041 | Wai-Mo Suen | Mark Miller, Wai-Mo Suen and Malcolm Tobias | The Shapiro Conjecture: Prompt or Delayed Collapse in the head-on
collision of neutron stars? | 4 pages, 7 figures | Phys.Rev.D63:121501,2001 | 10.1103/PhysRevD.63.121501 | null | gr-qc astro-ph | null | We study the question of prompt vs. delayed collapse in the head-on collision
of two neutron stars. We show that the prompt formation of a black hole is
possible, contrary to a conjecture of Shapiro which claims that collapse is
delayed until after neutrino cooling. We discuss the insight provided by
Shapiro's conjec... | [
{
"created": "Mon, 19 Apr 1999 22:43:36 GMT",
"version": "v1"
}
] | 2009-12-31 | [
[
"Miller",
"Mark",
""
],
[
"Suen",
"Wai-Mo",
""
],
[
"Tobias",
"Malcolm",
""
]
] | We study the question of prompt vs. delayed collapse in the head-on collision of two neutron stars. We show that the prompt formation of a black hole is possible, contrary to a conjecture of Shapiro which claims that collapse is delayed until after neutrino cooling. We discuss the insight provided by Shapiro's conjectu... |
1601.03106 | J\"org Hennig | J\"org Hennig | New Gowdy-symmetric vacuum and electrovacuum solutions | 25 pages, 2 figures | Class. Quantum Grav. 33, 135005 (2016) | 10.1088/0264-9381/33/13/135005 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a 4-parameter family of inhomogeneous cosmological models, which
contains two recently derived 3-parameter families as special cases. The
corresponding exact vacuum solution to Einstein's field equations is obtained
with methods from soliton theory. We also study properties of these models and
find that ... | [
{
"created": "Wed, 13 Jan 2016 00:49:40 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2016 00:54:45 GMT",
"version": "v2"
}
] | 2016-06-03 | [
[
"Hennig",
"Jörg",
""
]
] | We construct a 4-parameter family of inhomogeneous cosmological models, which contains two recently derived 3-parameter families as special cases. The corresponding exact vacuum solution to Einstein's field equations is obtained with methods from soliton theory. We also study properties of these models and find that th... |
0806.0241 | Tomilchik Lev | L. M. Tomilchik | Hubble law, Accelerating Universe and Pioneer Anomaly as effects of the
space-time conformal geometry | Reported on International Seminar "Modern Problems of the Particle
Physics" dedicated to Prof. I. L. Solovtsov momory, 17 January 2008, JINR,
Dubna, Russia | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The description of the cosmological expansion and its possible local
manifestations via treating the proper conformal transformations as a
coordinate transformation from a comoving Lorentz reference frame to an
uniformly accelerated one is given. The explicit form of the conformal time
inhomogeneity is established. T... | [
{
"created": "Mon, 2 Jun 2008 09:59:53 GMT",
"version": "v1"
}
] | 2008-06-03 | [
[
"Tomilchik",
"L. M.",
""
]
] | The description of the cosmological expansion and its possible local manifestations via treating the proper conformal transformations as a coordinate transformation from a comoving Lorentz reference frame to an uniformly accelerated one is given. The explicit form of the conformal time inhomogeneity is established. The... |
1212.2689 | Carlos A. Batista da S. Filho | Carlos Batista and Bruno Carneiro da Cunha | Spinors and the Weyl Tensor Classification in Six Dimensions | 23 pages; This version matches the published one | J. Math. Phys. 54 (2013), 052502 | 10.1063/1.4804991 | null | gr-qc hep-th math.DG | http://creativecommons.org/licenses/by/3.0/ | A spinorial approach to 6-dimensional differential geometry is constructed
and used to analyze tensor fields of low rank, with special attention to the
Weyl tensor. We perform a study similar to the 4-dimensional case, making full
use of the SO(6) symmetry to uncover results not easily seen in the tensorial
approach.... | [
{
"created": "Wed, 12 Dec 2012 02:12:44 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2013 19:27:14 GMT",
"version": "v2"
}
] | 2013-06-06 | [
[
"Batista",
"Carlos",
""
],
[
"da Cunha",
"Bruno Carneiro",
""
]
] | A spinorial approach to 6-dimensional differential geometry is constructed and used to analyze tensor fields of low rank, with special attention to the Weyl tensor. We perform a study similar to the 4-dimensional case, making full use of the SO(6) symmetry to uncover results not easily seen in the tensorial approach. U... |
2304.07383 | Alexander Simpson | Alex Simpson | Excising Curvature Singularities from General Relativity | PhD Thesis; 276 pages; 42 figures; 429 references. v1 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis operates within the framework of general relativity without
curvature singularities. The motivation for this framework is explored, and
several conclusions are drawn with a look towards future research. There are
many ways to excise curvature singularities from general relativity; a full
list of desirable... | [
{
"created": "Fri, 14 Apr 2023 20:32:36 GMT",
"version": "v1"
}
] | 2023-04-18 | [
[
"Simpson",
"Alex",
""
]
] | This thesis operates within the framework of general relativity without curvature singularities. The motivation for this framework is explored, and several conclusions are drawn with a look towards future research. There are many ways to excise curvature singularities from general relativity; a full list of desirable c... |
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