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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1510.06820 | Evan Goetz | Evan Goetz and Keith Riles | Coherently combining short data segments for all-sky semi-coherent
continuous gravitational wave searches | 15 pages, 3 figures, 1 table | null | 10.1088/0264-9381/33/8/085007 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method for coherently combining short data segments from
gravitational-wave detectors to improve the sensitivity of semi-coherent
searches for continuous gravitational waves. All-sky searches for continuous
gravitational waves from unknown sources are computationally limited. The
semi-coherent approach r... | [
{
"created": "Fri, 23 Oct 2015 03:41:49 GMT",
"version": "v1"
}
] | 2016-04-13 | [
[
"Goetz",
"Evan",
""
],
[
"Riles",
"Keith",
""
]
] | We present a method for coherently combining short data segments from gravitational-wave detectors to improve the sensitivity of semi-coherent searches for continuous gravitational waves. All-sky searches for continuous gravitational waves from unknown sources are computationally limited. The semi-coherent approach red... |
gr-qc/9912011 | Martin Rainer | Martin Rainer | Is Loop Quantum Gravity a QFT ? | 10 pages, latex & AMS symb., presented at ERE 99 (Bilbao), v2: errors
& misprints corrected at beginning/end of sec.2, and in sec. 4 | null | null | null | gr-qc | null | We investigate up to which extend the kinematic setting of loop quantum
gravity can be fit into a diffeomorphism invariant setting of algebraic QFT
generalizing the Haag-Kastler setting of Wightman type QFT. The net of local
(Weyl-)algebras resulting from a spin network state of quantum geometry
immediately accommoda... | [
{
"created": "Thu, 2 Dec 1999 16:29:41 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jan 2000 15:03:24 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rainer",
"Martin",
""
]
] | We investigate up to which extend the kinematic setting of loop quantum gravity can be fit into a diffeomorphism invariant setting of algebraic QFT generalizing the Haag-Kastler setting of Wightman type QFT. The net of local (Weyl-)algebras resulting from a spin network state of quantum geometry immediately accommodate... |
2106.10582 | Javier Rubio | Grigoris Panotopoulos, Javier Rubio, Il\'idio Lopes | On the impact of non-local gravity on compact stars | 19 pages, 4 figures, matches the version published in International
Journal of Modern Physics D | null | 10.1142/S0218271822501395 | null | gr-qc astro-ph.HE astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of non-local modifications of General Relativity on
stellar structure. In particular, assuming an analytic distortion function and
specific equations of state, we made use of remnant stars to put qualitative
constraints on a parameter not directly restricted by solar system tests. Using
current da... | [
{
"created": "Sat, 19 Jun 2021 22:48:03 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2023 21:52:33 GMT",
"version": "v2"
}
] | 2023-01-23 | [
[
"Panotopoulos",
"Grigoris",
""
],
[
"Rubio",
"Javier",
""
],
[
"Lopes",
"Ilídio",
""
]
] | We study the impact of non-local modifications of General Relativity on stellar structure. In particular, assuming an analytic distortion function and specific equations of state, we made use of remnant stars to put qualitative constraints on a parameter not directly restricted by solar system tests. Using current data... |
2401.15331 | Wang Zun | Zun Wang, Junjie Zhao, Zhoujian Cao | Accuracy of numerical relativity waveforms with respect to space-based
gravitational wave detectors | null | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As with the laser interferometer gravitational-wave observatory (LIGO), the
matched filtering technique will be critical to the data analysis of
gravitational wave detection by space-based detectors, including LISA, Taiji
and Tianqin. Waveform templates are the basis for such matched filtering
techniques. To construc... | [
{
"created": "Sat, 27 Jan 2024 07:39:46 GMT",
"version": "v1"
}
] | 2024-01-30 | [
[
"Wang",
"Zun",
""
],
[
"Zhao",
"Junjie",
""
],
[
"Cao",
"Zhoujian",
""
]
] | As with the laser interferometer gravitational-wave observatory (LIGO), the matched filtering technique will be critical to the data analysis of gravitational wave detection by space-based detectors, including LISA, Taiji and Tianqin. Waveform templates are the basis for such matched filtering techniques. To construct ... |
1308.0318 | Lin-Qing Chen | Lin-Qing Chen | Orientability of loop processes in relative locality | 14 pages, 6 figures; v3 matches the published version | Phys. Rev. D 88, 124003 (2013) | 10.1103/PhysRevD.88.124003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by recent results of unusual properties of loop processes in
relative locality, we introduce a way to classify loops in the case of
kappa-Poincare momentum space. We show that the notion of orientability is
deeply connected to a few essential properties of loop processes. Nonorientable
loops have "effective ... | [
{
"created": "Thu, 1 Aug 2013 19:50:02 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Aug 2013 05:34:12 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Dec 2013 05:48:44 GMT",
"version": "v3"
}
] | 2013-12-16 | [
[
"Chen",
"Lin-Qing",
""
]
] | Inspired by recent results of unusual properties of loop processes in relative locality, we introduce a way to classify loops in the case of kappa-Poincare momentum space. We show that the notion of orientability is deeply connected to a few essential properties of loop processes. Nonorientable loops have "effective cu... |
2003.07068 | Massimiliano Rinaldi | Alessandro Casalino, Aimeric Colleaux, Massimiliano Rinaldi, and
Silvia Vicentini | Regularized Lovelock gravity | Clarifications about the validity of the D->4 limiting procedure
added. References added | Physics of the Dark Universe, vol 31, 100770 (2021) | 10.1016/j.dark.2020.100770 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A four-dimensional regularization of Lovelock-Lanczos gravity up to an
arbitrary curvature order is considered. We show that Lovelock-Lanczos terms
can provide a non-trivial contribution to the Einstein field equations in four
dimensions, for spherically symmetric and
Friedmann-Lema\^{i}tre-Robertson-Walker spacetime... | [
{
"created": "Mon, 16 Mar 2020 08:16:45 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Mar 2020 15:51:47 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Nov 2020 11:20:51 GMT",
"version": "v3"
}
] | 2021-01-12 | [
[
"Casalino",
"Alessandro",
""
],
[
"Colleaux",
"Aimeric",
""
],
[
"Rinaldi",
"Massimiliano",
""
],
[
"Vicentini",
"Silvia",
""
]
] | A four-dimensional regularization of Lovelock-Lanczos gravity up to an arbitrary curvature order is considered. We show that Lovelock-Lanczos terms can provide a non-trivial contribution to the Einstein field equations in four dimensions, for spherically symmetric and Friedmann-Lema\^{i}tre-Robertson-Walker spacetimes,... |
gr-qc/9904029 | Carlo Rovelli | Carlo Rovelli | Spectral noncommutative geometry and quantization: a simple example | 7 pages, no figures | Phys.Rev.Lett. 83 (1999) 1079-1083 | 10.1103/PhysRevLett.83.1079 | null | gr-qc | null | We explore the relation between noncommutative geometry, in the spectral
triple formulation, and quantum mechanics. To this aim, we consider a dynamical
theory of a noncommutative geometry defined by a spectral triple, and study its
quantization. In particular, we consider a simple model based on a finite
dimensional... | [
{
"created": "Tue, 13 Apr 1999 09:08:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Rovelli",
"Carlo",
""
]
] | We explore the relation between noncommutative geometry, in the spectral triple formulation, and quantum mechanics. To this aim, we consider a dynamical theory of a noncommutative geometry defined by a spectral triple, and study its quantization. In particular, we consider a simple model based on a finite dimensional s... |
0705.1359 | David Brown | J. David Brown | Puncture Evolution of Schwarzschild Black Holes | This is the final version to be published in PRD. One important
change: the phrase "excision by under resolution" is replaced by the more
appropriate phrase "natural excision" | Phys.Rev.D77:044018,2008 | 10.1103/PhysRevD.77.044018 | null | gr-qc | null | The moving puncture method is analyzed for a single, non-spinning black hole.
It is shown that the puncture region is not resolved by current numerical
codes. As a result, the geometry near the puncture appears to evolve to an
infinitely long cylinder of finite areal radius. The puncture itself actually
remains at sp... | [
{
"created": "Wed, 9 May 2007 20:19:00 GMT",
"version": "v1"
},
{
"created": "Fri, 25 May 2007 20:06:07 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Jan 2008 15:04:24 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Brown",
"J. David",
""
]
] | The moving puncture method is analyzed for a single, non-spinning black hole. It is shown that the puncture region is not resolved by current numerical codes. As a result, the geometry near the puncture appears to evolve to an infinitely long cylinder of finite areal radius. The puncture itself actually remains at spac... |
2206.05110 | Simran Arora | Simran Arora, P.K. Sahoo | Crossing phantom divide in $f(Q)$ gravity | Annalen der Physik accepted version | Annalen der Physik, 534 (2022) 2200233 | 10.1002/andp.202200233 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the possibility of crossing a phantom divide line in the
extension of symmetric teleparallel gravity or the $f(Q)$ gravity, where $Q$ is
the non-metricity. We study the cosmic evolution of the effective equation of
state parameter for dark energy considering exponential, logarithmic, and
combined $f(Q)... | [
{
"created": "Wed, 8 Jun 2022 16:05:36 GMT",
"version": "v1"
}
] | 2022-08-10 | [
[
"Arora",
"Simran",
""
],
[
"Sahoo",
"P. K.",
""
]
] | We investigate the possibility of crossing a phantom divide line in the extension of symmetric teleparallel gravity or the $f(Q)$ gravity, where $Q$ is the non-metricity. We study the cosmic evolution of the effective equation of state parameter for dark energy considering exponential, logarithmic, and combined $f(Q)$ ... |
1005.0717 | Roberto A. Sussman | Roberto A. Sussman | Evolution of radial profiles in regular Lemaitre-Tolman-Bondi dust
models | Final version to appear in Classical and Quantum Gravity. Readers
eager to know the results and implications without having to go through the
technical detail are recommended to go directly to the summary and discussion
in the final section (section 11). Typos have been corrected and an important
reference has ... | Class.Quant.Grav.27:175001,2010 | 10.1088/0264-9381/27/17/175001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We undertake a comprehensive and rigorous analytic study of the evolution of
radial profiles of covariant scalars in regular Lemaitre-Tolman-Bondi dust
models. We consider specifically the phenomenon of "profile inversions" in
which an initial clump profile of density, spatial curvature or the expansion
scalar, might... | [
{
"created": "Wed, 5 May 2010 10:42:20 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2010 08:19:44 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jun 2010 05:51:50 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Sussman",
"Roberto A.",
""
]
] | We undertake a comprehensive and rigorous analytic study of the evolution of radial profiles of covariant scalars in regular Lemaitre-Tolman-Bondi dust models. We consider specifically the phenomenon of "profile inversions" in which an initial clump profile of density, spatial curvature or the expansion scalar, might e... |
2201.05036 | Avik De Dr. | Avik De, Sanjay Mandal, J.T. Beh, Tee-How Loo and P.K. Sahoo | Isotropization of locally rotationally symmetric Bianchi-I universe in
$f(Q)$-gravity | Accepted on 12/01/2022 for publication in the journal EPJC | Eur. Phys. J. C 82, 72 (2022) | 10.1140/epjc/s10052-022-10021-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Despite having the somewhat successful description of accelerated cosmology,
the early evolution of the universe always challenges mankind. Our promising
approach lies in a new class of symmetric teleparallel theory of gravity named
$f(Q)$, where the non-metricity scalar $Q$ is responsible for the gravitational
inter... | [
{
"created": "Wed, 12 Jan 2022 02:10:07 GMT",
"version": "v1"
}
] | 2022-01-25 | [
[
"De",
"Avik",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Beh",
"J. T.",
""
],
[
"Loo",
"Tee-How",
""
],
[
"Sahoo",
"P. K.",
""
]
] | Despite having the somewhat successful description of accelerated cosmology, the early evolution of the universe always challenges mankind. Our promising approach lies in a new class of symmetric teleparallel theory of gravity named $f(Q)$, where the non-metricity scalar $Q$ is responsible for the gravitational interac... |
1101.1147 | Kouji Nakamura | Kouji Nakamura | Decomposition of linear metric perturbations on generic background
spacetime -- Toward higher-order general-relativistic gauge-invariant
perturbation theory | 41 pages, no figure, Full paper version of [arXiv:1011.5272[gr-qc]] | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decomposition of the linear-order metric perturbation is discussed in the
context of the higher-order gauge-invariant perturbation theory. We show that
the linear order metric perturbation is decomposed into gauge-invariant and
gauge-variant parts on the general background spacetime which admits ADM
decomposition... | [
{
"created": "Thu, 6 Jan 2011 06:40:19 GMT",
"version": "v1"
}
] | 2011-01-10 | [
[
"Nakamura",
"Kouji",
""
]
] | The decomposition of the linear-order metric perturbation is discussed in the context of the higher-order gauge-invariant perturbation theory. We show that the linear order metric perturbation is decomposed into gauge-invariant and gauge-variant parts on the general background spacetime which admits ADM decomposition. ... |
1802.00098 | Kirill Bronnikov | Kirill A. Bronnikov | Scalar fields as sources for wormholes and regular black holes | 29 pages, 6 figures. Some comments and 6 references added | Particles 2018, 1, 5 | 10.3390/particles1010005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review nonsingular static, spherically symmetric solutions of general
relativity with a minimally coupled scalar field $\phi$ as a source. Considered
are wormholes and regular black holes without a center, including black
universes (black holes with an expanding cosmology beyond the horizon). Such
configurations r... | [
{
"created": "Wed, 31 Jan 2018 23:27:09 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Mar 2018 05:46:02 GMT",
"version": "v2"
}
] | 2018-03-16 | [
[
"Bronnikov",
"Kirill A.",
""
]
] | We review nonsingular static, spherically symmetric solutions of general relativity with a minimally coupled scalar field $\phi$ as a source. Considered are wormholes and regular black holes without a center, including black universes (black holes with an expanding cosmology beyond the horizon). Such configurations req... |
1409.6656 | Steven Willison | Steven Willison | Local Well-posedness of Lovelock gravity | 2 pages, no figures. This article agrees with the published version
apart from small corrections in equation 2 and text below equations 2 and 7 | Class. Quant. Grav. 32 022001 (2015) | 10.1088/0264-9381/32/2/022001 | null | gr-qc hep-th math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has long been known that Lovelock gravity, being of Cauchy-Kowalevskaya
type, admits a well defined initial value problem for analytic data. However,
this does not address the physically important issues of continuous dependence
of the solution on the data and the domain of dependence property. In this note
we fil... | [
{
"created": "Tue, 23 Sep 2014 16:18:36 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jan 2015 11:35:03 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Willison",
"Steven",
""
]
] | It has long been known that Lovelock gravity, being of Cauchy-Kowalevskaya type, admits a well defined initial value problem for analytic data. However, this does not address the physically important issues of continuous dependence of the solution on the data and the domain of dependence property. In this note we fill ... |
2110.13836 | Shouvik Sadhukhan Mr | Alokananda Kar, Shouvik Sadhukhan, Surajit Chattopadhyay | Thermodynamics and energy condition analysis for Van-Der-Waals EOS
without viscous cosmology | 28 pages, 27 figures. Physica Scripta (2021) | null | 10.1088/1402-4896/ac2f00 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper we have studied Van-Der-Waals fluid system with the generalized
EOS as as discussed in the recent works of Kremer, G.M [1, 4], Vardiashvili, G
[2], Jantsch, R.C [3], Capozziello, S [5]. and are functions of energy density
and time that are different for the three types of Van der Waals fluid which
are o... | [
{
"created": "Tue, 26 Oct 2021 16:32:57 GMT",
"version": "v1"
}
] | 2021-10-27 | [
[
"Kar",
"Alokananda",
""
],
[
"Sadhukhan",
"Shouvik",
""
],
[
"Chattopadhyay",
"Surajit",
""
]
] | In this paper we have studied Van-Der-Waals fluid system with the generalized EOS as as discussed in the recent works of Kremer, G.M [1, 4], Vardiashvili, G [2], Jantsch, R.C [3], Capozziello, S [5]. and are functions of energy density and time that are different for the three types of Van der Waals fluid which are one... |
1201.2805 | Cecilia Chirenti | Cecilia Chirenti and Alberto Saa | Double null formulation of the general Vaidya metric | 13 pages, 5 figures, final version to appear in CQG | Class. Quantum Grav. 29, 135003 (2012) | 10.1088/0264-9381/29/13/135003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present here the field equations describing a non-stationary spherically
symmetric n-dimensional charged black hole with varying mass m(v) and/or
electric charge q(v), described by a generic charged Vaidya metric with
cosmological constant Lambda in double null coordinates. This formulation of
the metric has been ... | [
{
"created": "Fri, 13 Jan 2012 11:17:34 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2012 15:04:22 GMT",
"version": "v2"
}
] | 2012-05-30 | [
[
"Chirenti",
"Cecilia",
""
],
[
"Saa",
"Alberto",
""
]
] | We present here the field equations describing a non-stationary spherically symmetric n-dimensional charged black hole with varying mass m(v) and/or electric charge q(v), described by a generic charged Vaidya metric with cosmological constant Lambda in double null coordinates. This formulation of the metric has been sh... |
gr-qc/9506083 | Matt Visser | Eric Poisson and Matt Visser (Washington University) | Thin-shell wormholes: Linearization stability | 4 pages; ReV_TeX 3.0; one postscript figure | Phys.Rev. D52 (1995) 7318-7321 | 10.1103/PhysRevD.52.7318 | null | gr-qc | null | The class of spherically-symmetric thin-shell wormholes provides a
particularly elegant collection of exemplars for the study of traversable
Lorentzian wormholes. In the present paper we consider linearized (spherically
symmetric) perturbations around some assumed static solution of the Einstein
field equations. This... | [
{
"created": "Fri, 30 Jun 1995 18:49:41 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Poisson",
"Eric",
"",
"Washington University"
],
[
"Visser",
"Matt",
"",
"Washington University"
]
] | The class of spherically-symmetric thin-shell wormholes provides a particularly elegant collection of exemplars for the study of traversable Lorentzian wormholes. In the present paper we consider linearized (spherically symmetric) perturbations around some assumed static solution of the Einstein field equations. This p... |
gr-qc/0605075 | Malcolm MacCallum | Mar\'ia Jes\'us Pareja and Malcolm A.H. MacCallum | Local freedom in the gravitational field revisited | LaTeX. 13 pp. To be submitted to Class. Quant. Grav | Class.Quant.Grav. 23 (2006) 5039-5048 | 10.1088/0264-9381/23/15/019 | null | gr-qc | null | Maartens {\it et al.}\@ gave a covariant characterization, in a 1+3 formalism
based on a perfect fluid's velocity, of the parts of the first derivatives of
the curvature tensor in general relativity which are ``locally free'', i.e. not
pointwise determined by the fluid energy momentum and its derivative. The full
dec... | [
{
"created": "Fri, 12 May 2006 12:21:32 GMT",
"version": "v1"
}
] | 2016-08-16 | [
[
"Pareja",
"María Jesús",
""
],
[
"MacCallum",
"Malcolm A. H.",
""
]
] | Maartens {\it et al.}\@ gave a covariant characterization, in a 1+3 formalism based on a perfect fluid's velocity, of the parts of the first derivatives of the curvature tensor in general relativity which are ``locally free'', i.e. not pointwise determined by the fluid energy momentum and its derivative. The full decom... |
1901.06400 | Eduardo Rodr\'iguez | Fernando Izaurieta, Eduardo Rodr\'iguez, Omar Valdivia | Linear and Second-order Geometry Perturbations on Spacetimes with
Torsion | 6 pages, no figures. v2: version accepted for publication in EPJC | null | 10.1140/epjc/s10052-019-6852-y | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to study gravitational waves in any realistic astrophysical
scenario, one must consider geometry perturbations up to second order. Here, we
present a general technique for studying linear and quadratic perturbations on
a spacetime with torsion. Besides the standard metric mode, a "torsionon"
perturbation mod... | [
{
"created": "Fri, 18 Jan 2019 19:36:02 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2019 21:04:24 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Izaurieta",
"Fernando",
""
],
[
"Rodríguez",
"Eduardo",
""
],
[
"Valdivia",
"Omar",
""
]
] | In order to study gravitational waves in any realistic astrophysical scenario, one must consider geometry perturbations up to second order. Here, we present a general technique for studying linear and quadratic perturbations on a spacetime with torsion. Besides the standard metric mode, a "torsionon" perturbation mode ... |
0807.4483 | John Veitch | John Veitch, Alberto Vecchio | Assigning confidence to inspiral gravitational wave candidates with
Bayesian model selection | From the Proceedings of the 11th Gravitational Wave Data Analysis
Workshop 11 pages, 4 pages | Class. Quantum Grav. 25 (2008) 184010 | 10.1088/0264-9381/25/18/184010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bayesian model selection provides a powerful and mathematically transparent
framework to tackle hypothesis testing, such as detection tests of
gravitational waves emitted during the coalescence of binary systems using
ground-based laser interferometers. Although its implementation is
computationally intensive, we hav... | [
{
"created": "Mon, 28 Jul 2008 16:08:15 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Veitch",
"John",
""
],
[
"Vecchio",
"Alberto",
""
]
] | Bayesian model selection provides a powerful and mathematically transparent framework to tackle hypothesis testing, such as detection tests of gravitational waves emitted during the coalescence of binary systems using ground-based laser interferometers. Although its implementation is computationally intensive, we have ... |
2108.04056 | Ettore Minguzzi | Sebastian Gurriaran and Ettore Minguzzi | Surface gravity of compact non-degenerate horizons under the dominant
energy condition | Latex, 37 pages, 2 figures. v2: added appendix and one figure,
expanded introduction | Commun. Math. Phys. 395 (2022) 679-713 | 10.1007/s00220-022-04440-8 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that under the dominant energy condition any non-degenerate smooth
compact totally geodesic horizon admits a smooth tangent vector field of
constant non-zero surface gravity. This result generalizes previous work by
Isenberg and Moncrief, and by Bustamante and Reiris to the non-vacuum case, the
vacuum case b... | [
{
"created": "Mon, 9 Aug 2021 14:10:29 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2022 08:13:53 GMT",
"version": "v2"
}
] | 2022-09-27 | [
[
"Gurriaran",
"Sebastian",
""
],
[
"Minguzzi",
"Ettore",
""
]
] | We prove that under the dominant energy condition any non-degenerate smooth compact totally geodesic horizon admits a smooth tangent vector field of constant non-zero surface gravity. This result generalizes previous work by Isenberg and Moncrief, and by Bustamante and Reiris to the non-vacuum case, the vacuum case bei... |
0712.0465 | Valentin Kuzmichev | V. E. Kuzmichev, V. V. Kuzmichev (Bogolyubov Institute for Theoretical
Physics) | Accelerating Quantum Universe | 15 pages, v.2 additional explanations and a few corrections are
provided | Acta Phys.Polon.B39:2003-2018,2008 | null | null | gr-qc astro-ph | null | The origin of negative pressure fluid (the dark energy) is investigated in
the quantum model of the homogeneous, isotropic and closed universe filled with
a uniform scalar field and a perfect fluid which defines a reference frame. The
equations of the model are reduced to the form which allows a direct comparison
bet... | [
{
"created": "Tue, 4 Dec 2007 09:46:01 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Apr 2008 09:09:27 GMT",
"version": "v2"
}
] | 2008-12-19 | [
[
"Kuzmichev",
"V. E.",
"",
"Bogolyubov Institute for Theoretical\n Physics"
],
[
"Kuzmichev",
"V. V.",
"",
"Bogolyubov Institute for Theoretical\n Physics"
]
] | The origin of negative pressure fluid (the dark energy) is investigated in the quantum model of the homogeneous, isotropic and closed universe filled with a uniform scalar field and a perfect fluid which defines a reference frame. The equations of the model are reduced to the form which allows a direct comparison betwe... |
2308.08281 | Bahram Mashhoon | Javad Tabatabaei, Abdolali Banihashemi, Shant Baghram, and Bahram
Mashhoon | Anisotropic Cosmology in the Local Limit of Nonlocal Gravity | 25 pages; v2: minor improvements, invited contribution to appear in
Universe | Universe 9, 377 (2023) | 10.3390/universe9090377 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Within the framework of the local limit of nonlocal gravity (NLG), we
investigate a class of Bianchi type I spatially homogeneous but anisotropic
cosmological models. The modified field equations are presented in this case
and some special solutions are discussed in detail. This modified gravity
theory contains a sus... | [
{
"created": "Wed, 16 Aug 2023 10:42:08 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2023 08:41:56 GMT",
"version": "v2"
}
] | 2023-08-24 | [
[
"Tabatabaei",
"Javad",
""
],
[
"Banihashemi",
"Abdolali",
""
],
[
"Baghram",
"Shant",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | Within the framework of the local limit of nonlocal gravity (NLG), we investigate a class of Bianchi type I spatially homogeneous but anisotropic cosmological models. The modified field equations are presented in this case and some special solutions are discussed in detail. This modified gravity theory contains a susce... |
gr-qc/0009050 | Stefano Liberati | S. Liberati | Vacuum Effects in Gravitational Fields: Theory and Detectability | Latex2e, 237 pages, 36 figures. Ph.D. Thesis | null | null | null | gr-qc | null | In this thesis, we investigate quantum vacuum effects in the presence of
gravitational fields. After discussing the general theory of vacuum effects in
strong fields we apply it to the relevant issue of the interaction of the
quantum vacuum with black hole geometries. In particular we consider the
long-standing probl... | [
{
"created": "Thu, 14 Sep 2000 15:07:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Liberati",
"S.",
""
]
] | In this thesis, we investigate quantum vacuum effects in the presence of gravitational fields. After discussing the general theory of vacuum effects in strong fields we apply it to the relevant issue of the interaction of the quantum vacuum with black hole geometries. In particular we consider the long-standing problem... |
1812.03844 | Luigi Pilo | Sabino Matarrese, Luigi Pilo, Rocco Rollo | $\Delta N$ Formalism and Conserved Currents in Cosmology | 19 pages, 1 figures. Final version accepted for publication in JCAP.
Title slightly changed to avoid confusion with existing literature. Expanded
content with the same conclusions | null | 10.1088/1475-7516/2019/04/017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\Delta N$ formalism, based on the counting of the number of e-folds
during inflation in different local patches of the Universe, has been
introduced several years ago as a simple and physically intuitive approach to
calculate (non-linear) curvature perturbations from inflation on large sales,
without resorting t... | [
{
"created": "Thu, 6 Dec 2018 17:48:47 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Dec 2018 11:29:07 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Apr 2019 07:51:53 GMT",
"version": "v3"
}
] | 2019-04-17 | [
[
"Matarrese",
"Sabino",
""
],
[
"Pilo",
"Luigi",
""
],
[
"Rollo",
"Rocco",
""
]
] | The $\Delta N$ formalism, based on the counting of the number of e-folds during inflation in different local patches of the Universe, has been introduced several years ago as a simple and physically intuitive approach to calculate (non-linear) curvature perturbations from inflation on large sales, without resorting to ... |
1407.5376 | Malik Rakhmanov | Malik Rakhmanov | On the round-trip time for a photon propagating in the field of a plane
gravitational wave | null | Classical and Quantum Gravity, vol. 26, p. 155010, (2009) | 10.1088/0264-9381/26/15/155010 | LIGO P070060 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A network of large-scale laser interferometers is currently employed for
searches of gravitational waves from various astrophysical sources. The
frequency dependence of the dynamic response of these detectors introduces
corrections to their antenna patterns which in principle can affect the outcome
of the associated ... | [
{
"created": "Mon, 21 Jul 2014 05:35:28 GMT",
"version": "v1"
}
] | 2014-07-22 | [
[
"Rakhmanov",
"Malik",
""
]
] | A network of large-scale laser interferometers is currently employed for searches of gravitational waves from various astrophysical sources. The frequency dependence of the dynamic response of these detectors introduces corrections to their antenna patterns which in principle can affect the outcome of the associated da... |
2204.00384 | Joshua Foo | Joshua Foo, Robert B. Mann, Magdalena Zych | Schr\"odinger's Black Hole Cat | 12 pages, Honourable Mention in the Gravity Research Foundation 2022
Awards for Essays on Gravitation | International Journal of Modern Physics D 31, 14 (2022) | 10.1142/S0218271822420160 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | In the absence of a fully-fledged theory of quantum gravity, we propose a
"bottom-up" framework for exploring quantum-gravitational physics by pairing
two of the most fundamental concepts of quantum theory and general relativity,
namely quantum superposition and spacetime. We show how to describe such
"spacetime supe... | [
{
"created": "Fri, 1 Apr 2022 12:11:36 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2022 03:30:58 GMT",
"version": "v2"
}
] | 2022-12-20 | [
[
"Foo",
"Joshua",
""
],
[
"Mann",
"Robert B.",
""
],
[
"Zych",
"Magdalena",
""
]
] | In the absence of a fully-fledged theory of quantum gravity, we propose a "bottom-up" framework for exploring quantum-gravitational physics by pairing two of the most fundamental concepts of quantum theory and general relativity, namely quantum superposition and spacetime. We show how to describe such "spacetime superp... |
2401.07307 | Lorenzo Fatibene | L.Fatibene, A.Orizzonte, A.Albano, S.Coriasco, M.Ferraris, S.Garruto,
N.Morandi | Introduction to Loop Quantum Gravity. The Holst's action and the
covariant formalism | 19 pages | International Journal of Geometric Methods in Modern Physics
(2024) | 10.1142/S0219887824400164 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We review Holst formalism and we discuss dynamical equivalence with standard
GR (in dimension 4). Holst formalism is written for a spin coframe field
$e^I_\mu$ and a $Spin(3,1)$-connection $\omega^{IJ}_\mu$ on spacetime $M$ and
it depends on the Holst parameter $\gamma\in \mathbb{R}-\{0\}$.
We show the model is dyn... | [
{
"created": "Sun, 14 Jan 2024 14:55:39 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Fatibene",
"L.",
""
],
[
"Orizzonte",
"A.",
""
],
[
"Albano",
"A.",
""
],
[
"Coriasco",
"S.",
""
],
[
"Ferraris",
"M.",
""
],
[
"Garruto",
"S.",
""
],
[
"Morandi",
"N.",
""
]
] | We review Holst formalism and we discuss dynamical equivalence with standard GR (in dimension 4). Holst formalism is written for a spin coframe field $e^I_\mu$ and a $Spin(3,1)$-connection $\omega^{IJ}_\mu$ on spacetime $M$ and it depends on the Holst parameter $\gamma\in \mathbb{R}-\{0\}$. We show the model is dynamic... |
2402.09513 | Nicholas DePorzio | Nicholas DePorzio, Lisa Randall, Zhong-Zhi Xianyu | Mass Beyond Measure: Eccentric Searches for Black Hole Populations | 13 pages, 10 figures | null | null | null | gr-qc astro-ph.CO astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stellar mass binary black holes of unknown formation mechanism have been
observed, motivating new methods for distinguishing distinct black hole
populations. This work explores how the orbital eccentricity of stellar mass
binary black holes is a viable conduit for making such distinctions. Four
different production m... | [
{
"created": "Wed, 14 Feb 2024 19:00:01 GMT",
"version": "v1"
}
] | 2024-03-04 | [
[
"DePorzio",
"Nicholas",
""
],
[
"Randall",
"Lisa",
""
],
[
"Xianyu",
"Zhong-Zhi",
""
]
] | Stellar mass binary black holes of unknown formation mechanism have been observed, motivating new methods for distinguishing distinct black hole populations. This work explores how the orbital eccentricity of stellar mass binary black holes is a viable conduit for making such distinctions. Four different production mec... |
0711.4328 | George Ruppeiner | George Ruppeiner | Black Holes: Fermions at the Extremal Limit? | 12 page article, 1 Table, 1 Figure | null | null | null | gr-qc | null | I present exact results matching Kerr-Newman Black Hole thermodynamics in the
extremal limit to the two-dimensional Fermi Gas. Two dimensions are consistent
with the membrane paradigm of black holes. Key in the analysis is the
thermodynamic Riemannian curvature scalar $R$, negative for most ordinary
thermodynamic sys... | [
{
"created": "Tue, 27 Nov 2007 18:59:30 GMT",
"version": "v1"
}
] | 2007-11-28 | [
[
"Ruppeiner",
"George",
""
]
] | I present exact results matching Kerr-Newman Black Hole thermodynamics in the extremal limit to the two-dimensional Fermi Gas. Two dimensions are consistent with the membrane paradigm of black holes. Key in the analysis is the thermodynamic Riemannian curvature scalar $R$, negative for most ordinary thermodynamic syste... |
1910.03439 | Henrique de Oliveira | J. A. Crespo, H. P. de Oliveira and J. Winicour | The affine-null formulation of the gravitational equations: spherical
case | 18 pages, 10 figures | Phys. Rev. D 100, 104017 (2019) | 10.1103/PhysRevD.100.104017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new evolution algorithm for the characteristic initial value problem based
upon an affine parameter rather than the areal radial coordinate used in the
Bondi-Sachs formulation is applied in the spherically symmetric case to the
gravitational collapse of a massless scalar field. The advantages over the
Bondi-Sachs v... | [
{
"created": "Tue, 8 Oct 2019 14:57:49 GMT",
"version": "v1"
}
] | 2019-11-13 | [
[
"Crespo",
"J. A.",
""
],
[
"de Oliveira",
"H. P.",
""
],
[
"Winicour",
"J.",
""
]
] | A new evolution algorithm for the characteristic initial value problem based upon an affine parameter rather than the areal radial coordinate used in the Bondi-Sachs formulation is applied in the spherically symmetric case to the gravitational collapse of a massless scalar field. The advantages over the Bondi-Sachs ver... |
1207.7041 | Foek Hioe | F. T. Hioe and David Kuebel | Characterization of all possible orbits in the Schwarzschild metric
revisited | 67 pages including 23 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All possible orbital trajectories and their analytical expressions in the
Schwarzschild metric are presented in a single complete map characterized by
two dimensionless parameters. While three possible pairs of parameters with
different advantages are described, the parameter space that gives the most
convenient redu... | [
{
"created": "Mon, 30 Jul 2012 18:59:41 GMT",
"version": "v1"
}
] | 2012-07-31 | [
[
"Hioe",
"F. T.",
""
],
[
"Kuebel",
"David",
""
]
] | All possible orbital trajectories and their analytical expressions in the Schwarzschild metric are presented in a single complete map characterized by two dimensionless parameters. While three possible pairs of parameters with different advantages are described, the parameter space that gives the most convenient reduct... |
gr-qc/9312027 | Bill Unruh | W.G. Unruh | Time Gravity and Quantum Mechanics | 50 pages. This paper was presented to a conference entitled "Time's
Arrow Today", a gathering of philosophers and physicists in 1992 | null | null | null | gr-qc | null | Time plays different roles in quantum mechanics and gravity. These roles are
examined and the problems that the conflict in the roles presents for quantum
gravity are briefly summarised.
| [
{
"created": "Fri, 17 Dec 1993 04:05:00 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 1993 04:26:00 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Unruh",
"W. G.",
""
]
] | Time plays different roles in quantum mechanics and gravity. These roles are examined and the problems that the conflict in the roles presents for quantum gravity are briefly summarised. |
gr-qc/9710083 | Sanjay Jhingan | S. Jhingan | The Structure of Singularity in Gravitational Collapse | 3 pages, latex file, requires mprocl.sty, no figures. To appear in
the proceedings of the Eighth Marcel Grossmann Conference on General
Relativity (Jerusalem, Israel, 22-27 June 1997) | null | null | null | gr-qc | null | We will describe here the structure of singularity forming in gravitational
collapse of spherically symmetric inhomogeneous dust. Such a collapse is
described by the Tolman-Bondi-Lema{\^i}tre metric. The main new result here
relates, in a general way, the formation of black holes and naked
shell-focusing singularitie... | [
{
"created": "Fri, 17 Oct 1997 05:19:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jhingan",
"S.",
""
]
] | We will describe here the structure of singularity forming in gravitational collapse of spherically symmetric inhomogeneous dust. Such a collapse is described by the Tolman-Bondi-Lema{\^i}tre metric. The main new result here relates, in a general way, the formation of black holes and naked shell-focusing singularities ... |
1307.2935 | Ioannis Gkigkitzis Dr. | Ioannis Haranas, Omiros Ragos, Ioannis Gkigkitzis | The Lens-Thirring effect in the anomalistic period of celestial bodies | 12 pages, 5 Figures | null | null | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the weak field and slow motion approximation, the general relativistic
field equations are linearized, resembling those of the electromagnetic theory.
In a way analogous to that of a moving charge generating a magnetic field, a
mass energy current can produce a gravitomagnetic field. In this contribution,
the moti... | [
{
"created": "Wed, 10 Jul 2013 22:35:40 GMT",
"version": "v1"
}
] | 2013-07-12 | [
[
"Haranas",
"Ioannis",
""
],
[
"Ragos",
"Omiros",
""
],
[
"Gkigkitzis",
"Ioannis",
""
]
] | In the weak field and slow motion approximation, the general relativistic field equations are linearized, resembling those of the electromagnetic theory. In a way analogous to that of a moving charge generating a magnetic field, a mass energy current can produce a gravitomagnetic field. In this contribution, the motion... |
1811.09518 | Piero Nicolini | Athanasios G. Tzikas, Piero Nicolini, Jonas Mureika and Bernard Carr | Primordial black holes in a dimensionally reduced universe | 26 pages, 8 figures; v2 published in JCAP | JCAP 1812 (2018) no.12, 033 | 10.1088/1475-7516/2018/12/033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the spontaneous creation of primordial black holes in a
lower-dimensional expanding early universe. We use the no-boundary proposal to
construct instanton solutions for both the background and a black hole
nucleated inside this background. The resulting creation rate could lead to a
significant populat... | [
{
"created": "Fri, 23 Nov 2018 15:23:51 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Dec 2018 16:56:29 GMT",
"version": "v2"
}
] | 2018-12-20 | [
[
"Tzikas",
"Athanasios G.",
""
],
[
"Nicolini",
"Piero",
""
],
[
"Mureika",
"Jonas",
""
],
[
"Carr",
"Bernard",
""
]
] | We investigate the spontaneous creation of primordial black holes in a lower-dimensional expanding early universe. We use the no-boundary proposal to construct instanton solutions for both the background and a black hole nucleated inside this background. The resulting creation rate could lead to a significant populatio... |
gr-qc/9706023 | Herbert Balasin | H.Balasin and W.Israel | Do Vortex Filaments in a Superfluid Neutron Star Produce Gravimagnetic
Forces ? | 11 pages, LaTeX with amslatex macros | Class.Quant.Grav. 16 (1999) 61-67 | 10.1088/0264-9381/16/1/004 | null | gr-qc | null | A general analysis of the gravitational dynamics of a medium with a
continuous distribution of vorticity indicates that the answer to the question
raised in the title is affirmative, contrary to a recent claim.
| [
{
"created": "Tue, 10 Jun 1997 06:58:18 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Balasin",
"H.",
""
],
[
"Israel",
"W.",
""
]
] | A general analysis of the gravitational dynamics of a medium with a continuous distribution of vorticity indicates that the answer to the question raised in the title is affirmative, contrary to a recent claim. |
1308.3977 | Vitaliy Voytik | Vitaliy Voytik | On the equations of the inverse kinematics problem | 12 p | STFI, 1 (2014) 28-36 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper derived differential equations which solve the problem of
restoration the motion parameters for a rigid reference frame from the known
proper acceleration and angular velocity of its origin as functions of proper
time. These equations are based on the well-known transformation to an
arbitrary rigid non-iner... | [
{
"created": "Mon, 19 Aug 2013 10:40:10 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Apr 2023 17:08:32 GMT",
"version": "v2"
}
] | 2023-04-18 | [
[
"Voytik",
"Vitaliy",
""
]
] | The paper derived differential equations which solve the problem of restoration the motion parameters for a rigid reference frame from the known proper acceleration and angular velocity of its origin as functions of proper time. These equations are based on the well-known transformation to an arbitrary rigid non-inerti... |
gr-qc/0502051 | Paolo Zampetti | Dino Boccaletti, Francesco Catoni, Roberto Cannata, Paolo Zampetti | Integrating the geodesic equations in the Schwarzschild and Kerr
space-times using Beltrami's "geometrical" method | 12 pages; corrected typos, journal-ref added | General Relativity and Gravitation, 37(12) (2005) 2261 | 10.1007/s10714-005-0203-z | null | gr-qc | null | We revisit a little known theorem due to Beltrami, through which the
integration of the geodesic equations of a curved manifold is accomplished by a
method which, even if inspired by the Hamilton-Jacobi method, is purely
geometric. The application of this theorem to the Schwarzschild and Kerr
metrics leads straightfo... | [
{
"created": "Fri, 11 Feb 2005 10:20:47 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Apr 2008 12:57:01 GMT",
"version": "v2"
}
] | 2008-04-03 | [
[
"Boccaletti",
"Dino",
""
],
[
"Catoni",
"Francesco",
""
],
[
"Cannata",
"Roberto",
""
],
[
"Zampetti",
"Paolo",
""
]
] | We revisit a little known theorem due to Beltrami, through which the integration of the geodesic equations of a curved manifold is accomplished by a method which, even if inspired by the Hamilton-Jacobi method, is purely geometric. The application of this theorem to the Schwarzschild and Kerr metrics leads straightforw... |
2001.04702 | Ali Kazemi | Ali Kazemi, Mahmood Roshan, Ivan De Martino, Mariafelicia De Laurentis | Jeans analysis in energy-momentum-squared gravity | 21 pages, 6 figs, Published (EPJC) | Eur. Phys. J. C (2020) 80: 150 | 10.1140/epjc/s10052-020-7662-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the Jeans analysis in the context of
energy-momentum-squared gravity (EMSG). More specifically we find the new Jeans
mass for non-rotating infinite mediums as the smallest mass scale for local
perturbations that can be stable against its own gravity. Furthermore, for
rotating mediums, specific... | [
{
"created": "Tue, 14 Jan 2020 10:29:51 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Feb 2020 06:01:36 GMT",
"version": "v2"
}
] | 2020-02-25 | [
[
"Kazemi",
"Ali",
""
],
[
"Roshan",
"Mahmood",
""
],
[
"De Martino",
"Ivan",
""
],
[
"De Laurentis",
"Mariafelicia",
""
]
] | In this paper, we study the Jeans analysis in the context of energy-momentum-squared gravity (EMSG). More specifically we find the new Jeans mass for non-rotating infinite mediums as the smallest mass scale for local perturbations that can be stable against its own gravity. Furthermore, for rotating mediums, specifical... |
1803.09649 | Wen-Biao Liu Prof. | Xin-Yang Wang, Jie Jiang, Wen-Biao Liu | Entropy in the interior of a Kerr black hole | 16 pages, 3 figures | null | 10.1088/1361-6382/aae276 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Christodoulou and Rovelli have shown that the maximal interior volume of a
Schwarzschild black hole linearly grows with time. Recently, their conclusion
has been extended to the Reissner{-}Nordstr$\ddot{\text{o}}$m and Kerr black
holes. Meanwhile, the entropy of interior volume in a Schwarzschild black hole
has also ... | [
{
"created": "Fri, 23 Mar 2018 09:41:09 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jun 2018 02:54:28 GMT",
"version": "v2"
}
] | 2018-10-24 | [
[
"Wang",
"Xin-Yang",
""
],
[
"Jiang",
"Jie",
""
],
[
"Liu",
"Wen-Biao",
""
]
] | Christodoulou and Rovelli have shown that the maximal interior volume of a Schwarzschild black hole linearly grows with time. Recently, their conclusion has been extended to the Reissner{-}Nordstr$\ddot{\text{o}}$m and Kerr black holes. Meanwhile, the entropy of interior volume in a Schwarzschild black hole has also be... |
0806.2365 | Mikhail Sheftel | Metin Arik and Mikhail B. Sheftel | Symmetry analysis and exact solutions of modified Brans-Dicke
cosmological equations | LaTeX2e source file, 14 pages, 7 references | Phys.Rev.D78:064067,2008 | 10.1103/PhysRevD.78.064067 | null | gr-qc astro-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a symmetry analysis of modified Brans-Dicke cosmological equations
and present exact solutions. We discuss how the solutions may help to build
models of cosmology where, for the early universe, the expansion is linear and
the equation of state just changes the expansion velocity but not the
linearity. For ... | [
{
"created": "Mon, 16 Jun 2008 18:45:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arik",
"Metin",
""
],
[
"Sheftel",
"Mikhail B.",
""
]
] | We perform a symmetry analysis of modified Brans-Dicke cosmological equations and present exact solutions. We discuss how the solutions may help to build models of cosmology where, for the early universe, the expansion is linear and the equation of state just changes the expansion velocity but not the linearity. For th... |
gr-qc/9812085 | Mamdouh Wanas | M.I.Wanas, M.Melek, and M.E.Kahil | Quantum Interference of Thermal Neutrons and Spin-Torsion Interaction | seven pages Tex file | Grav.Cosmol. 6 (2000) 319-322 | null | null | gr-qc quant-ph | null | The discrepancy of $0.8 %$ between theory and the COW-experiment is
interpreted. This is done by using a new path equation other than the geodesic
one. It is shown that this discrepancy is possibly due to a type of interaction
between the torsion, of space-time generated by the background field, and the
spin of the m... | [
{
"created": "Sat, 26 Dec 1998 11:55:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wanas",
"M. I.",
""
],
[
"Melek",
"M.",
""
],
[
"Kahil",
"M. E.",
""
]
] | The discrepancy of $0.8 %$ between theory and the COW-experiment is interpreted. This is done by using a new path equation other than the geodesic one. It is shown that this discrepancy is possibly due to a type of interaction between the torsion, of space-time generated by the background field, and the spin of the mov... |
2002.08358 | S. Danial Forghani | S. Danial Forghani and S. Habib Mazharimousavi | Thin-shell Wormholes with Ordinary Matter in Pure Gauss-Bonnet Gravity | 11 pages, 3 figures | null | 10.1088/1475-7516/2020/11/018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we introduce higher dimensional thin-shell wormholes in pure
Gauss-Bonnet gravity. The focus is on thin-shell wormholes constructed by
$N\geq5$-dimensional spherically symmetric vacuum solutions. The results
suggest that, under certain conditions, it is possible to have thin-shell
wormholes that both s... | [
{
"created": "Wed, 19 Feb 2020 11:49:38 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Sep 2020 07:17:31 GMT",
"version": "v2"
}
] | 2020-11-25 | [
[
"Forghani",
"S. Danial",
""
],
[
"Mazharimousavi",
"S. Habib",
""
]
] | In this paper, we introduce higher dimensional thin-shell wormholes in pure Gauss-Bonnet gravity. The focus is on thin-shell wormholes constructed by $N\geq5$-dimensional spherically symmetric vacuum solutions. The results suggest that, under certain conditions, it is possible to have thin-shell wormholes that both sat... |
gr-qc/0507033 | Samuel Rocha Oliveira | L.A. D'Afonseca, P.S. Letelier and S.R. Oliveira | Geodesics around Weyl-Bach's Ring Solution | 8 figures, 14 pages. LaTeX w/ subfigure, graphicx | Class.Quant.Grav. 22 (2005) 3803-3814 | 10.1088/0264-9381/22/17/028 | null | gr-qc | null | We explore some of the gravitational features of a uniform ring both in the
Newtonian potential theory and in General Relativity. We use a spacetime
associated to a Weyl static solution of the vacuum Einstein's equations with
ring like singularity. The Newtonian motion for a test particle in the
gravitational field o... | [
{
"created": "Thu, 7 Jul 2005 21:45:42 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 2005 20:52:44 GMT",
"version": "v2"
}
] | 2020-05-13 | [
[
"D'Afonseca",
"L. A.",
""
],
[
"Letelier",
"P. S.",
""
],
[
"Oliveira",
"S. R.",
""
]
] | We explore some of the gravitational features of a uniform ring both in the Newtonian potential theory and in General Relativity. We use a spacetime associated to a Weyl static solution of the vacuum Einstein's equations with ring like singularity. The Newtonian motion for a test particle in the gravitational field of ... |
gr-qc/0105099 | Luc Blanchet | Luc Blanchet, Guillaume Faye, Bala R. Iyer, Benoit Joguet | Gravitational-Wave Inspiral of Compact Binary Systems to 7/2
Post-Newtonian Order | 12 pages, version which includes the correction of an Erratum to be
published in Phys. Rev. D (2005) | Phys.Rev.D65:061501,2002; Erratum-ibid.D71:129902,2005 | 10.1103/PhysRevD.65.061501 10.1103/PhysRevD.71.129902 | null | gr-qc | null | The inspiral of compact binaries, driven by gravitational-radiation reaction,
is investigated through 7/2 post-Newtonian (3.5PN) order beyond the quadrupole
radiation. We outline the derivation of the 3.5PN-accurate binary's
center-of-mass energy and emitted gravitational flux. The analysis consistently
includes the ... | [
{
"created": "Sat, 26 May 2001 10:56:34 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Oct 2001 10:13:11 GMT",
"version": "v2"
},
{
"created": "Fri, 27 May 2005 14:48:08 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Iyer",
"Bala R.",
""
],
[
"Joguet",
"Benoit",
""
]
] | The inspiral of compact binaries, driven by gravitational-radiation reaction, is investigated through 7/2 post-Newtonian (3.5PN) order beyond the quadrupole radiation. We outline the derivation of the 3.5PN-accurate binary's center-of-mass energy and emitted gravitational flux. The analysis consistently includes the re... |
gr-qc/9602011 | null | John Ellis, N.E. Mavromatos, D.V. Nanopoulos, E.Winstanley | Quantum Decoherence in a Four-Dimensional Black Hole Background | 13-pages LATEX | Mod.Phys.Lett.A12:243-256,1997 | 10.1142/S0217732397000248 | CERN-TH.95-336,CTP-TAMU-04/95,OUTP-96--05P | gr-qc hep-th quant-ph | null | We display a logarithmic divergence in the density matrix of a scalar field
in the presence of an Einstein-Yang-Mills black hole in four dimensions. This
divergence is related to a previously-found logarithmic divergence in the
entropy of the scalar field, which cannot be absorbed into a renormalization of
the Hawkin... | [
{
"created": "Wed, 7 Feb 1996 19:25:19 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Ellis",
"John",
""
],
[
"Mavromatos",
"N. E.",
""
],
[
"Nanopoulos",
"D. V.",
""
],
[
"Winstanley",
"E.",
""
]
] | We display a logarithmic divergence in the density matrix of a scalar field in the presence of an Einstein-Yang-Mills black hole in four dimensions. This divergence is related to a previously-found logarithmic divergence in the entropy of the scalar field, which cannot be absorbed into a renormalization of the Hawking-... |
1303.5520 | Yasusada Nambu | Ken-ichiro Kanai and Yasusada Nambu | Viewing Black Holes by Waves | 24 pages, final version to appear in Class. Quantum Grav | null | 10.1088/0264-9381/30/17/175002 | null | gr-qc astro-ph.HE physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scattering of waves by black holes. Solving a massless scalar field
with a point source in the Schwarzschild spacetime, waves scattered by the
black hole is obtained numerically. We then reconstruct images of the black
hole from scattered wave data for specified scattering angles. For the forward
and the bac... | [
{
"created": "Fri, 22 Mar 2013 05:31:39 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2013 07:23:59 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Kanai",
"Ken-ichiro",
""
],
[
"Nambu",
"Yasusada",
""
]
] | We study scattering of waves by black holes. Solving a massless scalar field with a point source in the Schwarzschild spacetime, waves scattered by the black hole is obtained numerically. We then reconstruct images of the black hole from scattered wave data for specified scattering angles. For the forward and the backw... |
1509.01529 | Sergey Paston | S.A. Paston, E.N. Semenova | External time canonical formalism for gravity in terms of embedding
theory | LaTeX, 17 pages | Gravitation and Cosmology, 2015, Vol. 21, No. 3, pp. 181-190 | 10.1134/S020228931503007X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formulation of gravity theory is considered where space-time is a
4-dimensional surface in flat ten-dimensional space. The possibility of using
the "external" time (the time of ambient space) in this approach is
investigated. The transition to the "external" time is realized with the help
of partial gauge fixing,... | [
{
"created": "Fri, 4 Sep 2015 17:07:28 GMT",
"version": "v1"
}
] | 2015-09-07 | [
[
"Paston",
"S. A.",
""
],
[
"Semenova",
"E. N.",
""
]
] | The formulation of gravity theory is considered where space-time is a 4-dimensional surface in flat ten-dimensional space. The possibility of using the "external" time (the time of ambient space) in this approach is investigated. The transition to the "external" time is realized with the help of partial gauge fixing, t... |
1906.00913 | Abhay Ashtekar | Abhay Ashtekar, Tommaso De Lorenzo and Neev Khera | Compact binary coalescences: Constraints on waveforms | 25 pages, 1 figure. The main results are the same as in V1. Focus of
the article improved by expanding the material addressed to the waveform
community and dropping the one primarily addressed to mathematical
relativists. Discussion updated in view of new results of [46] - [48] | General Relativity and Gravitation 52, 107 (2020) | 10.1007/s10714-020-02764-1 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waveforms for compact binary coalescences (CBCs) have been
invaluable for detections by the LIGO-Virgo collaboration. They are obtained by
a combination of semi-analytical models and numerical simulations. So far
systematic errors arising from these procedures appear to be less than
statistical ones. Ho... | [
{
"created": "Mon, 3 Jun 2019 16:29:34 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2020 13:58:57 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jan 2021 17:55:02 GMT",
"version": "v3"
}
] | 2021-01-13 | [
[
"Ashtekar",
"Abhay",
""
],
[
"De Lorenzo",
"Tommaso",
""
],
[
"Khera",
"Neev",
""
]
] | Gravitational waveforms for compact binary coalescences (CBCs) have been invaluable for detections by the LIGO-Virgo collaboration. They are obtained by a combination of semi-analytical models and numerical simulations. So far systematic errors arising from these procedures appear to be less than statistical ones. Howe... |
gr-qc/0211037 | Adrian Butscher | Adrian Butscher | Perturbative Solutions of the Extended Constraint Equations in General
Relativity | This third and final version has been accepted for publication in
Communications in Mathematical Physics | Commun.Math.Phys.272:1-23,2007 | 10.1007/s00220-007-0204-8 | null | gr-qc math.DG | null | The extended constraint equations arise as a special case of the conformal
constraint equations that are satisfied by an initial data hypersurface $Z$ in
an asymptotically simple spacetime satisfying the vacuum conformal Einstein
equations developed by H. Friedrich. The extended constraint equations consist
of a quas... | [
{
"created": "Mon, 11 Nov 2002 20:38:22 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 2003 05:18:59 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Sep 2006 18:33:12 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Butscher",
"Adrian",
""
]
] | The extended constraint equations arise as a special case of the conformal constraint equations that are satisfied by an initial data hypersurface $Z$ in an asymptotically simple spacetime satisfying the vacuum conformal Einstein equations developed by H. Friedrich. The extended constraint equations consist of a quasi-... |
1605.02369 | Luis Lehner | Luis Lehner, Steven L. Liebling, Carlos Palenzuela and Patrick Motl | The $m=1$ instability \& gravitational wave signal in binary neutron
star mergers | 9 pages, 5 figures. Update to match published version; in particular
the previous version used an incorrect noise curve which affected slightly
the conclusions. This is now fixed | Phys. Rev. D 94, 043003 (2016) | 10.1103/PhysRevD.94.043003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the development and detectability of the $m=1$ instability in the
remnant of binary neutron star mergers. The detection of the gravitational mode
associated with the $m=1$ degree of freedom could potentially reveal details of
the equation of state. We analyze the post-merger epoch of simulations of both
eq... | [
{
"created": "Sun, 8 May 2016 21:21:31 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2016 12:45:50 GMT",
"version": "v2"
}
] | 2016-08-22 | [
[
"Lehner",
"Luis",
""
],
[
"Liebling",
"Steven L.",
""
],
[
"Palenzuela",
"Carlos",
""
],
[
"Motl",
"Patrick",
""
]
] | We examine the development and detectability of the $m=1$ instability in the remnant of binary neutron star mergers. The detection of the gravitational mode associated with the $m=1$ degree of freedom could potentially reveal details of the equation of state. We analyze the post-merger epoch of simulations of both equa... |
gr-qc/9610033 | null | M. Tsuda and T. Shirafuji | Structure of the field equations in N = 1 chiral supergravity | 19 pages, latex | null | null | STUPP-96-149 | gr-qc | null | We study the structure of linearized field equations in $N = 1$ chiral
supergravity (SUGRA) with a complex tetrad, as a preliminary to introducing
additional auxiliary fields in order that the supersymmetry (SUSY) algebra
close off shell. We follow the first-order formulation we have recently
constructed using the me... | [
{
"created": "Wed, 16 Oct 1996 04:07:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tsuda",
"M.",
""
],
[
"Shirafuji",
"T.",
""
]
] | We study the structure of linearized field equations in $N = 1$ chiral supergravity (SUGRA) with a complex tetrad, as a preliminary to introducing additional auxiliary fields in order that the supersymmetry (SUSY) algebra close off shell. We follow the first-order formulation we have recently constructed using the meth... |
gr-qc/0201099 | Israel Quiros | Israel Quiros (Physics Department. Las Villas Central University.
Santa Clara) | Scale Invariant Kaluza-Klein Theory and the Fate of the Gravitational
Collapse | 10 pages, latex, no figures | null | null | null | gr-qc | null | Pushing forward the similitudes between the gravitational collapse and the
expansion of the universe (in the reversed sense of time), it should be
expected that, during the collapse, eventually, a spacetime domain would be
reached where attained energy scales are very high. In consequence some of the
compactified ext... | [
{
"created": "Thu, 31 Jan 2002 03:47:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Quiros",
"Israel",
"",
"Physics Department. Las Villas Central University.\n Santa Clara"
]
] | Pushing forward the similitudes between the gravitational collapse and the expansion of the universe (in the reversed sense of time), it should be expected that, during the collapse, eventually, a spacetime domain would be reached where attained energy scales are very high. In consequence some of the compactified extra... |
1510.03474 | Vladimir Dergachev Ph.D. | J. Aasi, B. P. Abbott, R. Abbott, T. D. Abbott, M. R. Abernathy, F.
Acernese, K. Ackley, C. Adams, T. Adams, P. Addesso, R. X. Adhikari, V. B.
Adya, C. Affeldt, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, A. Ain,
P. Ajith, B. Allen, A. Allocca, D. V. Amariutei, M. Andersen, S. B. Anderson,
W. G. Anderso... | A search of the Orion spur for continuous gravitational waves using a
"loosely coherent" algorithm on data from LIGO interferometers | Fixed minor typo - duplicate name in the author list | Phys. Rev. D 93, 042006 (2016) | 10.1103/PhysRevD.93.042006 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report results of a wideband search for periodic gravitational waves from
isolated neutron stars within the Orion spur towards both the inner and outer
regions of our Galaxy. As gravitational waves interact very weakly with matter,
the search is unimpeded by dust and concentrations of stars. One search disk
(A) is... | [
{
"created": "Mon, 12 Oct 2015 22:16:26 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2015 23:47:04 GMT",
"version": "v2"
}
] | 2016-08-07 | [
[
"Aasi",
"J.",
"",
"Ski"
],
[
"Abbott",
"B. P.",
"",
"Ski"
],
[
"Abbott",
"R.",
"",
"Ski"
],
[
"Abbott",
"T. D.",
"",
"Ski"
],
[
"Abernathy",
"M. R.",
"",
"Ski"
],
[
"Acernese",
"F.",
"",
"Ski"
],
... | We report results of a wideband search for periodic gravitational waves from isolated neutron stars within the Orion spur towards both the inner and outer regions of our Galaxy. As gravitational waves interact very weakly with matter, the search is unimpeded by dust and concentrations of stars. One search disk (A) is $... |
gr-qc/0209031 | Gerald Kaiser | Gerald Kaiser | Electromagnetic Wavelets as Hertzian Pulsed Beams in Complex Spacetime | 16 pages, 2 figures, "Topics in Mathematical Physics, General
Relativity and Cosmology" conference (in honor of Jerzy Plebanski)
<http://cabana.fis.cinvestav.mx/~merced/> | null | null | null | gr-qc math-ph math.CV math.MP | null | Electromagnetic wavelets are a family of 3x3 matrix fields W_z(x')
parameterized by complex spacetime points z=x+iy with y timelike. They are
translates of a \sl basic \rm wavelet W(z) holomorphic in the future-oriented
union T of the forward and backward tubes. Applied to a complex polarization
vector p (representin... | [
{
"created": "Mon, 9 Sep 2002 18:26:38 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2002 19:57:33 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kaiser",
"Gerald",
""
]
] | Electromagnetic wavelets are a family of 3x3 matrix fields W_z(x') parameterized by complex spacetime points z=x+iy with y timelike. They are translates of a \sl basic \rm wavelet W(z) holomorphic in the future-oriented union T of the forward and backward tubes. Applied to a complex polarization vector p (representing ... |
gr-qc/9803026 | Janna Levin | Janna Levin, Evan Scannapieco and Joseph Silk | The topology of the universe: the biggest manifold of them all | Contribution to the Cosmology and Topology Workshop | Class.Quant.Grav. 15 (1998) 2689-2698 | 10.1088/0264-9381/15/9/015 | CfPA-98-TH-04 | gr-qc astro-ph | null | Clues as to the geometry of the universe are encoded in the cosmic background
radiation. Hot and cold spots in the primordial radiation may be randomly
distributed in an infinite universe while in a universe with compact topology
distinctive patterns can be generated. With improved vision, we could actually
see if th... | [
{
"created": "Fri, 6 Mar 1998 01:31:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Levin",
"Janna",
""
],
[
"Scannapieco",
"Evan",
""
],
[
"Silk",
"Joseph",
""
]
] | Clues as to the geometry of the universe are encoded in the cosmic background radiation. Hot and cold spots in the primordial radiation may be randomly distributed in an infinite universe while in a universe with compact topology distinctive patterns can be generated. With improved vision, we could actually see if the ... |
1301.1724 | Chikun Ding | Chikun Ding, Changqing Liu and Qian Guo | Spacetime noncommutative effect on black hole as particle accelerators | 12 pages, 6 figures, accepted for publication in the IJMPD | Int. J. Mod. Phys. D 22 1350013 (2013) | 10.1142/S0218271813500132 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spacetime noncommutative effect on black hole as particle
accelerators and, find that particle falling from infinity with zero velocity
cannot collide with unbound energy when the noncommutative Kerr black hole is
exactly extremal. Our results also show that the bigger of the spinning black
hole's mass i... | [
{
"created": "Tue, 8 Jan 2013 23:54:42 GMT",
"version": "v1"
}
] | 2013-10-22 | [
[
"Ding",
"Chikun",
""
],
[
"Liu",
"Changqing",
""
],
[
"Guo",
"Qian",
""
]
] | We study the spacetime noncommutative effect on black hole as particle accelerators and, find that particle falling from infinity with zero velocity cannot collide with unbound energy when the noncommutative Kerr black hole is exactly extremal. Our results also show that the bigger of the spinning black hole's mass is,... |
2305.18214 | Stanislav Komarov | Komarov S. O., Gorbatsievich A. K. and Vereshchagin G. V | Electromagnetic field of a charge asymptotically approaching spherically
symmetric black hole | 7 pages, 2 figures | Phys. Rev. D 108 (2023) 104056 | 10.1103/PhysRevD.108.104056 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We consider a test charged particle falling onto a Schwarzschild black hole
and evaluate its electromagnetic field. The Regge-Wheeler equation is solved
analytically by approximating the potential barrier with Dirac delta function
and rectangular barrier. We show that for asymptotically large time measured by
a dista... | [
{
"created": "Mon, 29 May 2023 17:00:18 GMT",
"version": "v1"
}
] | 2023-11-28 | [
[
"O.",
"Komarov S.",
""
],
[
"K.",
"Gorbatsievich A.",
""
],
[
"G.",
"Vereshchagin",
"V"
]
] | We consider a test charged particle falling onto a Schwarzschild black hole and evaluate its electromagnetic field. The Regge-Wheeler equation is solved analytically by approximating the potential barrier with Dirac delta function and rectangular barrier. We show that for asymptotically large time measured by a distant... |
1702.03440 | Liudmila Fesik Ms | L. E. Fesik, Yu. V. Baryshev, V. V. Sokolov, and G. Paturel | LIGO-Virgo events localization as a test of gravitational wave
polarization state | 17 pages, 19 figures | null | null | null | gr-qc hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of the gravitational wave events GW150914, GW151226, LVT 151012
and GW170104 by the Advanced LIGO antennas has opened a new possibility for the
study of fundamental physics of gravitational interaction. We suggest a new
method for determining the polarization state of a gravitational wave, which is
inde... | [
{
"created": "Sat, 11 Feb 2017 17:12:48 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2017 10:37:08 GMT",
"version": "v2"
}
] | 2017-06-29 | [
[
"Fesik",
"L. E.",
""
],
[
"Baryshev",
"Yu. V.",
""
],
[
"Sokolov",
"V. V.",
""
],
[
"Paturel",
"G.",
""
]
] | The detection of the gravitational wave events GW150914, GW151226, LVT 151012 and GW170104 by the Advanced LIGO antennas has opened a new possibility for the study of fundamental physics of gravitational interaction. We suggest a new method for determining the polarization state of a gravitational wave, which is indepe... |
gr-qc/0209007 | Daniel Hofmann | Daniel Hofmann | Quantum Radiation from Black Holes | 168 pages, 14 figures, PhD thesis | null | null | null | gr-qc hep-th | null | The expectation value of the energy-momentum tensor and the Hawking flux of a
scalar field on a Schwarzschild spacetime is calculated using the zeta-function
regularisation of the heat kernel. In particular, massless particles are
considered in a spherically reduced dilaton model. The effective action is
thereby obta... | [
{
"created": "Tue, 3 Sep 2002 15:28:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hofmann",
"Daniel",
""
]
] | The expectation value of the energy-momentum tensor and the Hawking flux of a scalar field on a Schwarzschild spacetime is calculated using the zeta-function regularisation of the heat kernel. In particular, massless particles are considered in a spherically reduced dilaton model. The effective action is thereby obtain... |
2211.10617 | Jin Li | Bo-Rui Wang, Jin Li, He Wang | Probing the gravitational wave background from cosmic strings with
Alternative LISA-TAIJI network | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | As one of the detection targets of all gravitational wave detectors at
present, stochastic gravitational wave background (SGWB) provides us an
important way to understand the evolution of our universe. In this paper, we
explore the feasibility of detecting the SGWB generated by the loops, which
arose throughout the c... | [
{
"created": "Sat, 19 Nov 2022 08:18:39 GMT",
"version": "v1"
}
] | 2022-11-22 | [
[
"Wang",
"Bo-Rui",
""
],
[
"Li",
"Jin",
""
],
[
"Wang",
"He",
""
]
] | As one of the detection targets of all gravitational wave detectors at present, stochastic gravitational wave background (SGWB) provides us an important way to understand the evolution of our universe. In this paper, we explore the feasibility of detecting the SGWB generated by the loops, which arose throughout the cos... |
gr-qc/9904028 | Angelo Tartaglia | G. Rizzi, A. Tartaglia (Dip. Fisica del Politecnico, Turin, Italy) | On local and global measurements of the speed of light on rotating
platforms | LATEX, 8 pages, to be published in Foundations of Physics Letters | Found.Phys.Lett. 12 (1999) 179-186 | null | null | gr-qc | null | The paper shows that, conceptually and operationally, the speed of light as
measured locally in the inertial comoving frame of a point on the rim of a
rotating disk, is different from the one measured globally for a round trip
along the rim, obtained dividing the length of the rim (as measured in the
''relative space... | [
{
"created": "Mon, 12 Apr 1999 14:13:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rizzi",
"G.",
"",
"Dip. Fisica del Politecnico, Turin, Italy"
],
[
"Tartaglia",
"A.",
"",
"Dip. Fisica del Politecnico, Turin, Italy"
]
] | The paper shows that, conceptually and operationally, the speed of light as measured locally in the inertial comoving frame of a point on the rim of a rotating disk, is different from the one measured globally for a round trip along the rim, obtained dividing the length of the rim (as measured in the ''relative space''... |
gr-qc/0402013 | Massimo Blasone Dr | M.Blasone, A.Capolupo, S.Capozziello, S.Carloni and G.Vitiello | Neutrino mixing contribution to the cosmological constant | 7 pages | Phys.Lett. A323 (2004) 182-189 | 10.1016/j.physleta.2004.02.004 | null | gr-qc | null | We show that the non-perturbative vacuum structure associated with neutrino
mixing leads to a non-zero contribution to the value of the cosmological
constant. Such a contribution comes from the specific nature of the mixing
phenomenon. Its origin is completely different from the one of the ordinary
contribution of a ... | [
{
"created": "Tue, 3 Feb 2004 17:22:40 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Blasone",
"M.",
""
],
[
"Capolupo",
"A.",
""
],
[
"Capozziello",
"S.",
""
],
[
"Carloni",
"S.",
""
],
[
"Vitiello",
"G.",
""
]
] | We show that the non-perturbative vacuum structure associated with neutrino mixing leads to a non-zero contribution to the value of the cosmological constant. Such a contribution comes from the specific nature of the mixing phenomenon. Its origin is completely different from the one of the ordinary contribution of a ma... |
1903.12072 | Tomi Koivisto | Jose Beltr\'an Jim\'enez, Lavinia Heisenberg, Tomi S. Koivisto | The canonical frame of purified gravity | 7 pages, no figures | null | 10.1142/S0218271819440127 | NORDITA 2019-030 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the recently introduced gauge theory of translations, dubbed Coincident
General Relativity, gravity is described with neither torsion nor curvature in
the spacetime affine geometry. The action of the theory enjoys an enhanced
symmetry and avoids the second derivatives that appear in the conventional
Einstein-Hilbe... | [
{
"created": "Thu, 28 Mar 2019 15:57:28 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Jiménez",
"Jose Beltrán",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Koivisto",
"Tomi S.",
""
]
] | In the recently introduced gauge theory of translations, dubbed Coincident General Relativity, gravity is described with neither torsion nor curvature in the spacetime affine geometry. The action of the theory enjoys an enhanced symmetry and avoids the second derivatives that appear in the conventional Einstein-Hilbert... |
1201.5423 | Guilherme de Berredo-Peixoto | G. de Berredo-Peixoto, L. Freidel, I.L. Shapiro and C.A. de Souza | Dirac fields, torsion and Barbero-Immirzi parameter in Cosmology | LaTeX file (with jcappub.sty), 16 pages, no figures. Some
formulations and discussions slightly modified, fits the version to be
published in JCAP | JCAP 06 (2012) 017 | 10.1088/1475-7516/2012/06/017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider cosmological solution for Einstein gravity with massive fermions
with a four-fermion coupling, which emerges from the Holst action and is
related to the Barbero-Immirzi (BI) parameter. This gravitational action is an
important object of investigation in a non-perturbative formalism of quantum
gravity. We ... | [
{
"created": "Thu, 26 Jan 2012 01:31:25 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2012 18:38:00 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"de Berredo-Peixoto",
"G.",
""
],
[
"Freidel",
"L.",
""
],
[
"Shapiro",
"I. L.",
""
],
[
"de Souza",
"C. A.",
""
]
] | We consider cosmological solution for Einstein gravity with massive fermions with a four-fermion coupling, which emerges from the Holst action and is related to the Barbero-Immirzi (BI) parameter. This gravitational action is an important object of investigation in a non-perturbative formalism of quantum gravity. We st... |
gr-qc/9409049 | Donald Marolf | Donald Marolf | Observables and a Hilbert Space for Bianchi IX | 23 pages, ReVTeX, CGPG-94/6-3, UCSBTH-94-39 | Class.Quant.Grav.12:1441-1454,1995 | 10.1088/0264-9381/12/6/010 | null | gr-qc | null | We consider a quantization of the Bianchi IX cosmological model based on
taking the constraint to be a self-adjoint operator in an auxiliary Hilbert
space. Using a WKB-style self-consistent approximation, the constraint chosen
is shown to have only continuous spectrum at zero. Nevertheless, the auxiliary
space induce... | [
{
"created": "Fri, 23 Sep 1994 00:39:22 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Marolf",
"Donald",
""
]
] | We consider a quantization of the Bianchi IX cosmological model based on taking the constraint to be a self-adjoint operator in an auxiliary Hilbert space. Using a WKB-style self-consistent approximation, the constraint chosen is shown to have only continuous spectrum at zero. Nevertheless, the auxiliary space induces ... |
1704.02295 | Ruward A. Mulder | Ruward A. Mulder and Dennis Dieks | Is Time Travel Too Strange to Be Possible? Determinism and Indeterminism
on Closed Timelike Curves | null | Book chapter: Nature and Ontology of Spacetime, Proceedings
(Montreal: Minkowski Institute Press, 2017) | null | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Notoriously, the Einstein equations of general relativity have solutions in
which closed timelike curves (CTCs) occur. On these curves time loops back onto
itself, which has exotic consequences. However, in order to make time travel
stories consistent constraints have to be satisfied, which prevents seemingly
ordinar... | [
{
"created": "Fri, 7 Apr 2017 17:11:16 GMT",
"version": "v1"
}
] | 2021-05-26 | [
[
"Mulder",
"Ruward A.",
""
],
[
"Dieks",
"Dennis",
""
]
] | Notoriously, the Einstein equations of general relativity have solutions in which closed timelike curves (CTCs) occur. On these curves time loops back onto itself, which has exotic consequences. However, in order to make time travel stories consistent constraints have to be satisfied, which prevents seemingly ordinary ... |
2309.03095 | Otto Kong | Otto C.W. Kong (Nat'l Central U, Taiwan) | Equivalence Principle for Quantum Mechanics in the Heisenberg Picture | 19 pages in Revtex, no figure; proof-read version published | Class. Quantum Grav. 41 (1924) 085013 | null | NCU-HEP-k101 | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We present an exact quantum observable analog of the weak equivalence
principle for a `relativistic' quantum particle. The quantum geodesic equations
are obtained from Heisenberg equations of motion as an exact analog of a fully
covariant classical Hamiltonian evolution picture, with the proper
identification of the ... | [
{
"created": "Tue, 5 Sep 2023 06:39:01 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2024 08:50:47 GMT",
"version": "v2"
}
] | 2024-05-15 | [
[
"Kong",
"Otto C. W.",
"",
"Nat'l Central U, Taiwan"
]
] | We present an exact quantum observable analog of the weak equivalence principle for a `relativistic' quantum particle. The quantum geodesic equations are obtained from Heisenberg equations of motion as an exact analog of a fully covariant classical Hamiltonian evolution picture, with the proper identification of the ca... |
2004.11087 | Ming Zhang | Ming Zhang, Jie Jiang | Emissions of photons near the horizons of Kerr-Sen black holes | 12 pages, 15 captioned figures, Sec. IV added | null | 10.1103/PhysRevD.102.124012 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We investigate the escape probabilities of the photons near the horizon of
the Kerr-Sen black hole. We find that the escape probabilities of the photons
are nonzero in the event horizon limit of the extreme Kerr-Sen black hole if
the light sources are near the equator. We show that the escape probability of
a photon ... | [
{
"created": "Thu, 23 Apr 2020 11:29:04 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Nov 2020 08:47:49 GMT",
"version": "v2"
}
] | 2020-12-09 | [
[
"Zhang",
"Ming",
""
],
[
"Jiang",
"Jie",
""
]
] | We investigate the escape probabilities of the photons near the horizon of the Kerr-Sen black hole. We find that the escape probabilities of the photons are nonzero in the event horizon limit of the extreme Kerr-Sen black hole if the light sources are near the equator. We show that the escape probability of a photon in... |
1510.04022 | Stoytcho Yazadjiev | Stoytcho Yazadjiev, Boian Lazov | Classification of the static and asymptotically flat
Einstein-Maxwell-dilaton spacetimes with a photon sphere | 18 pages | Phys. Rev. D 93, 083002 (2016) | 10.1103/PhysRevD.93.083002 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem for the classification of static and asymptotically
flat Einstein-Maxwell-dilaton spacetimes with a photon sphere. It is first
proven that the photon spheres in Einstein-Maxwell-dilaton gravity have
constant mean and constant scalar curvature. Then we derive some relations
between the mean cur... | [
{
"created": "Wed, 14 Oct 2015 09:48:08 GMT",
"version": "v1"
}
] | 2016-04-13 | [
[
"Yazadjiev",
"Stoytcho",
""
],
[
"Lazov",
"Boian",
""
]
] | We consider the problem for the classification of static and asymptotically flat Einstein-Maxwell-dilaton spacetimes with a photon sphere. It is first proven that the photon spheres in Einstein-Maxwell-dilaton gravity have constant mean and constant scalar curvature. Then we derive some relations between the mean curva... |
2104.06140 | Boris Latosh | Boris Latosh | On simple bootstrap in metric gravity | Some corrections are made, new references are added | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The simplest approach to bootstrap in general relativity is considered. The
approach claimed to recover the infinite perturbative series of graviton
interaction terms with a recursive coupling metric perturbations to their
energy-momentum tensor. We show that the approach provides an incorrect
expression for three-gr... | [
{
"created": "Tue, 13 Apr 2021 12:31:13 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 2021 10:59:18 GMT",
"version": "v2"
}
] | 2021-05-24 | [
[
"Latosh",
"Boris",
""
]
] | The simplest approach to bootstrap in general relativity is considered. The approach claimed to recover the infinite perturbative series of graviton interaction terms with a recursive coupling metric perturbations to their energy-momentum tensor. We show that the approach provides an incorrect expression for three-grav... |
2207.10965 | Krzysztof Urbanowski | K. Urbanowski | A universe born in a metastable false vacuum state needs not die | 13 pages, 7 figures; some typos corrected, comments and references
added, accepted by the European Physical Journal C. arXiv admin note: text
overlap with arXiv:2110.11957 | null | 10.1140/epjc/s10052-023-11197-4 | null | gr-qc astro-ph.HE hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | We try to find conditions, the fulfillment of which allows a universe born in
a metastable false vacuum state to survive and not to collapse. The conditions
found are in the form of inequalities linking the depending on time $t$
instantaneous decay rate ${\it\Gamma}(t)$ of the false vacuum state and the
Hubble parame... | [
{
"created": "Fri, 22 Jul 2022 09:23:20 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Jul 2022 11:10:18 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Jan 2023 19:41:31 GMT",
"version": "v3"
}
] | 2023-02-08 | [
[
"Urbanowski",
"K.",
""
]
] | We try to find conditions, the fulfillment of which allows a universe born in a metastable false vacuum state to survive and not to collapse. The conditions found are in the form of inequalities linking the depending on time $t$ instantaneous decay rate ${\it\Gamma}(t)$ of the false vacuum state and the Hubble paramete... |
2106.07508 | Theo Verwimp | Theo Verwimp | On Generating a Lagrangian for Higher Dimensional Gravity | 6 pages | Progress of Theoretical Physics, Vol 80, No.2 August 1988 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lovelock Lagrangian is for even dimension D obtained from Weil
polynomials on the Lie algebra of the Lorentz group SO(1,D-1). The procedure
for generating it is related to the Weil homomorphism that converts Lie algebra
invariants into cohomology classes.
| [
{
"created": "Mon, 14 Jun 2021 15:37:51 GMT",
"version": "v1"
}
] | 2021-06-15 | [
[
"Verwimp",
"Theo",
""
]
] | The Lovelock Lagrangian is for even dimension D obtained from Weil polynomials on the Lie algebra of the Lorentz group SO(1,D-1). The procedure for generating it is related to the Weil homomorphism that converts Lie algebra invariants into cohomology classes. |
2312.01142 | Igor Fomin | I. V. Fomin, S. V. Chervon and K. A. Bolshakova | Modified inflationary models based on scalar-torsion gravity | 12 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider the corrections to the cosmological models based on
the teleparralel equivalent of general relativity and the scalar-torsion
gravity implying non-minimal coupling between scalar field and torsion. To
determine these corrections, we consider a power-law parameterization of the
deviations betw... | [
{
"created": "Sat, 2 Dec 2023 14:00:05 GMT",
"version": "v1"
}
] | 2023-12-05 | [
[
"Fomin",
"I. V.",
""
],
[
"Chervon",
"S. V.",
""
],
[
"Bolshakova",
"K. A.",
""
]
] | In this work, we consider the corrections to the cosmological models based on the teleparralel equivalent of general relativity and the scalar-torsion gravity implying non-minimal coupling between scalar field and torsion. To determine these corrections, we consider a power-law parameterization of the deviations betwee... |
1507.07441 | Donato Bini | Donato Bini, Guillaume Faye, Andrea Geralico | Dynamics of extended bodies in a Kerr spacetime with spin-induced
quadrupole tensor | 27 pages, 6 figures, revtex style | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The features of equatorial motion of an extended body in Kerr spacetime are
investigated in the framework of the Mathisson-Papapetrou-Dixon model. The body
is assumed to stay at quasi-equilibrium and respond instantly to external
perturbations. Besides the mass, it is completely determined by its spin, the
multipolar... | [
{
"created": "Mon, 27 Jul 2015 15:17:22 GMT",
"version": "v1"
}
] | 2015-07-28 | [
[
"Bini",
"Donato",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Geralico",
"Andrea",
""
]
] | The features of equatorial motion of an extended body in Kerr spacetime are investigated in the framework of the Mathisson-Papapetrou-Dixon model. The body is assumed to stay at quasi-equilibrium and respond instantly to external perturbations. Besides the mass, it is completely determined by its spin, the multipolar e... |
gr-qc/0403067 | Kostadin Trencevski | Kostadin Trencevski | Deformation of the Planetary Orbits Caused by the Time Dependent
Gravitational Potential in the Universe | 7 pages | Gen.Rel.Grav. 37 (2005) 507-519 | 10.1007/s10714-005-0039-6 | null | gr-qc | null | In the paper are studied the deformations of the planetary orbits caused by
the time dependent gravitational potential in the universe. It is shown that
the orbits are not axially symmetric and the time dependent potential does not
cause perihelion precession. It is found a simple formula for the change of the
orbit ... | [
{
"created": "Mon, 15 Mar 2004 20:45:57 GMT",
"version": "v1"
},
{
"created": "Thu, 20 May 2004 18:35:48 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Trencevski",
"Kostadin",
""
]
] | In the paper are studied the deformations of the planetary orbits caused by the time dependent gravitational potential in the universe. It is shown that the orbits are not axially symmetric and the time dependent potential does not cause perihelion precession. It is found a simple formula for the change of the orbit pe... |
gr-qc/9505020 | Bronnikov Kirill Alexandrovich | K.A.Bronnikov | ON SPHERICALLY SYMMETRIC SOLUTIONS IN D-DIMENSIONAL DILATON GRAVITY | 13 pages, latex, no figures. To appear in Grav.& Cosmology journ | Grav.Cosmol. 1 (1995) 67-78 | null | RGS-VNIIMS-001/95 | gr-qc | null | Exact static, spherically symmetric solutions to the Einstein-Abelian
gauge-dilaton equations, in $D$-dimensional gravity with a chain of $n$
Ricci-flat internal spaces are considered, with the gauge field potential
having three nonzero components: the temporal, Coulomb-like one, the one
pointing to one of the extra ... | [
{
"created": "Mon, 15 May 1995 07:38:41 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 1995 09:39:42 GMT",
"version": "v2"
},
{
"created": "Thu, 18 May 1995 12:24:03 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Bronnikov",
"K. A.",
""
]
] | Exact static, spherically symmetric solutions to the Einstein-Abelian gauge-dilaton equations, in $D$-dimensional gravity with a chain of $n$ Ricci-flat internal spaces are considered, with the gauge field potential having three nonzero components: the temporal, Coulomb-like one, the one pointing to one of the extra di... |
1801.01714 | Francesco Alessio | Francesco Alessio | Asymptotic Structure and Bondi-Metzner-Sachs group in General Relativity | arXiv admin note: text overlap with arXiv:1709.05134 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work the asymptotic structure of space-time and the main properties
of the Bondi-Metzner-Sachs (BMS) group, which is the asymptotic symmetry group
of asymptotically flat space-times, are analysed. Every chapter, except the
fourth, begins with a brief summary of the topics that will be dealt through it
and an ... | [
{
"created": "Fri, 5 Jan 2018 11:10:32 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jan 2019 17:21:54 GMT",
"version": "v2"
}
] | 2019-01-24 | [
[
"Alessio",
"Francesco",
""
]
] | In this work the asymptotic structure of space-time and the main properties of the Bondi-Metzner-Sachs (BMS) group, which is the asymptotic symmetry group of asymptotically flat space-times, are analysed. Every chapter, except the fourth, begins with a brief summary of the topics that will be dealt through it and an in... |
1904.05727 | Khalid Saifullah | Askar Ali and Khalid Saifullah | Asymptotic magnetically charged non-singular black hole and its
thermodynamics | null | Physics Letters B 792 (2019) 276 | 10.1016/j.physletb.2019.03.041 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some very interesting solutions of the field equations of Einstein's general
theory of relativity have been constructed in the framework of nonlinear
electrodynamics. In particular, magnetically charged black hole solutions in
the framework of exponential nonlinear electrodynamics have been obtained in
general relati... | [
{
"created": "Thu, 11 Apr 2019 14:37:47 GMT",
"version": "v1"
}
] | 2019-04-12 | [
[
"Ali",
"Askar",
""
],
[
"Saifullah",
"Khalid",
""
]
] | Some very interesting solutions of the field equations of Einstein's general theory of relativity have been constructed in the framework of nonlinear electrodynamics. In particular, magnetically charged black hole solutions in the framework of exponential nonlinear electrodynamics have been obtained in general relativi... |
1311.2326 | Vladimir S. Manko | V.S. Manko, R.I. Rabad\'an, J.D. Sanabria-G\'omez | Stationary black diholes | 19 pages, 3 figures; small changes taking into account referee's
suggestions | Phys. Rev. D 89: 064049, 2014 | 10.1103/PhysRevD.89.064049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present and analyze the simplest physically meaningful model
for stationary black diholes - a binary configuration of counter-rotating
Kerr-Newman black holes endowed with opposite electric charges - elaborated in
a physical parametrization on the basis of one of the Ernst-Manko-Ruiz
equatorially ant... | [
{
"created": "Mon, 11 Nov 2013 01:49:45 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Nov 2013 04:28:33 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Nov 2015 21:41:04 GMT",
"version": "v3"
}
] | 2015-11-09 | [
[
"Manko",
"V. S.",
""
],
[
"Rabadán",
"R. I.",
""
],
[
"Sanabria-Gómez",
"J. D.",
""
]
] | In this paper we present and analyze the simplest physically meaningful model for stationary black diholes - a binary configuration of counter-rotating Kerr-Newman black holes endowed with opposite electric charges - elaborated in a physical parametrization on the basis of one of the Ernst-Manko-Ruiz equatorially antis... |
2403.16741 | Valery Zhdanov | V.I. Zhdanov, O.S. Stashko and Yu.V. Shtanov | Spherically symmetric configurations in the quadratic $f(R)$ gravity | 15 pages, 6 figures; minor corrections | Physical Review D 110, 024056 (2024) | 10.1103/PhysRevD.110.024056 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study spherically symmetric configurations of the quadratic $f(R)$ gravity
in the Einstein frame. In case of a purely gravitational system, we have
determined the global qualitative behavior of the metric and the scalaron field
for all static solutions satisfying the conditions of asymptotic flatness.
These soluti... | [
{
"created": "Mon, 25 Mar 2024 13:12:50 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2024 20:00:04 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Jul 2024 14:16:23 GMT",
"version": "v3"
}
] | 2024-07-30 | [
[
"Zhdanov",
"V. I.",
""
],
[
"Stashko",
"O. S.",
""
],
[
"Shtanov",
"Yu. V.",
""
]
] | We study spherically symmetric configurations of the quadratic $f(R)$ gravity in the Einstein frame. In case of a purely gravitational system, we have determined the global qualitative behavior of the metric and the scalaron field for all static solutions satisfying the conditions of asymptotic flatness. These solution... |
1209.3511 | John F. Donoghue | John F. Donoghue | The effective field theory treatment of quantum gravity | Presented at the Sixth International School on Field Theory and
Gravitation, Petropolis, Brazil, April 2012, to be published in the
proceedings. 22 pages, 3 figures | null | 10.1063/1.4756964 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a pedagogical introduction to the treatment of quantum general
relativity as an effective field theory. It starts with an overview of the
methods of effective field theory and includes an explicit example. Quantum
general relativity matches this framework and I discuss gravitational examples
as well as the li... | [
{
"created": "Sun, 16 Sep 2012 18:28:38 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Donoghue",
"John F.",
""
]
] | This is a pedagogical introduction to the treatment of quantum general relativity as an effective field theory. It starts with an overview of the methods of effective field theory and includes an explicit example. Quantum general relativity matches this framework and I discuss gravitational examples as well as the limi... |
2312.08789 | Jinbo He | Jin-Bo He | Spherical symmetric black hole based on Higher derivative gravity | To be modified | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theory of higher derivative gravity is proposed to solve the
non-renormalizable problem in quantum gravity.In this article, We use two
numerical methods to fit another static spherically symmetric black hole
besides the Schwarzschild black hole.We obtain approximate expressions for two
numerical solutions, both o... | [
{
"created": "Thu, 14 Dec 2023 10:15:17 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2024 08:47:09 GMT",
"version": "v2"
}
] | 2024-01-09 | [
[
"He",
"Jin-Bo",
""
]
] | The theory of higher derivative gravity is proposed to solve the non-renormalizable problem in quantum gravity.In this article, We use two numerical methods to fit another static spherically symmetric black hole besides the Schwarzschild black hole.We obtain approximate expressions for two numerical solutions, both of ... |
2308.00032 | Georgios K. Karananas Dr. | Georgios K. Karananas, Marco Michel, Javier Rubio | The geometry of inflationary observables: lifts, flows, equivalence
classes | 6 pages, no figures | null | null | LMU-ASC 26/23, IPARCOS-UCM-23-053 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Eisenhart lift allows to formulate the dynamics of a scalar field in a
potential as pure geodesic motion in a curved field-space manifold involving an
additional fictitious vector field. Making use of the formalism in the context
of inflation, we show that the main inflationary observables can be expressed
in ter... | [
{
"created": "Mon, 31 Jul 2023 18:00:02 GMT",
"version": "v1"
}
] | 2023-08-02 | [
[
"Karananas",
"Georgios K.",
""
],
[
"Michel",
"Marco",
""
],
[
"Rubio",
"Javier",
""
]
] | The Eisenhart lift allows to formulate the dynamics of a scalar field in a potential as pure geodesic motion in a curved field-space manifold involving an additional fictitious vector field. Making use of the formalism in the context of inflation, we show that the main inflationary observables can be expressed in terms... |
gr-qc/9803088 | Robert Manuel Wald | Robert M. Wald | Quantum Fields in Curved Spacetimes and Semiclassical Approaches: A
Workshop Summary | 7 pages, plain LaTeX 2.09 file | null | null | null | gr-qc | null | I briefly review some of the recent progress in quantum field theory in
curved spacetime and other aspects of semiclassical gravity, as reported at the
D3 Workshop at GR15.
| [
{
"created": "Thu, 26 Mar 1998 20:54:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wald",
"Robert M.",
""
]
] | I briefly review some of the recent progress in quantum field theory in curved spacetime and other aspects of semiclassical gravity, as reported at the D3 Workshop at GR15. |
2205.11746 | Paul Martens | Paul Martens, Hiroki Matsui, Shinji Mukohyama | DeWitt wave function in Ho\v{r}ava-Lifshitz cosmology with tensor
perturbation | 20 pages, 4 figures | null | 10.1088/1475-7516/2022/11/031 | YITP-22-52, IPMU22-0028 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We present a well-tempered DeWitt wave function, which vanishes at the
classical big-bang singularity, in Ho\v{r}ava-Lifshitz (HL) cosmology with
tensor perturbation, both analytically and numerically. In general relativity,
the DeWitt wave function is ill-behaved once the tensor perturbation is taken
into account. T... | [
{
"created": "Tue, 24 May 2022 03:20:23 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Martens",
"Paul",
""
],
[
"Matsui",
"Hiroki",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | We present a well-tempered DeWitt wave function, which vanishes at the classical big-bang singularity, in Ho\v{r}ava-Lifshitz (HL) cosmology with tensor perturbation, both analytically and numerically. In general relativity, the DeWitt wave function is ill-behaved once the tensor perturbation is taken into account. Thi... |
1812.11181 | Michele Maggiore | Enis Belgacem, Andreas Finke, Antonia Frassino and Michele Maggiore | Testing nonlocal gravity with Lunar Laser Ranging | 46 pages, 4 figures | null | 10.1088/1475-7516/2019/02/035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of the limit on $|\dot{G}|/G$ from Lunar Laser Ranging on
"nonlocal gravity", i.e. on models of the quantum effective action of gravity
that include nonlocal terms relevant in the infrared, such as the "RR" and "RT"
models proposed by our group, and the Deser-Woodard (DW) model. We elaborate on
th... | [
{
"created": "Fri, 28 Dec 2018 15:44:20 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Belgacem",
"Enis",
""
],
[
"Finke",
"Andreas",
""
],
[
"Frassino",
"Antonia",
""
],
[
"Maggiore",
"Michele",
""
]
] | We study the impact of the limit on $|\dot{G}|/G$ from Lunar Laser Ranging on "nonlocal gravity", i.e. on models of the quantum effective action of gravity that include nonlocal terms relevant in the infrared, such as the "RR" and "RT" models proposed by our group, and the Deser-Woodard (DW) model. We elaborate on the ... |
1312.1739 | Andrew DeBenedictis | Johan Brannlund, Andrew DeBenedictis, Alison Lauman | Topology and Volume Effects in Quantum Gravity: Wheeler-DeWitt Theory | 15 pages, 5 figures. New version has some clarifications and minor
typographical corrections. Updated version also includes a short appendix on
the geometry and topology of the sub-spaces. Matches version accepted for
publication in Classical and Quantum Gravity | Class. Quantum Grav. 31 (2014) 095011 | 10.1088/0264-9381/31/9/095011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the quantization of space-times which can possess different
topologies within a symmetry reduced version of Wheeler-DeWitt theory. The
quantum states are defined from a natural decomposition as an outer-product of
a topological state, dictating the topology of the two-surfaces of the
space-time, and a geo... | [
{
"created": "Fri, 6 Dec 2013 00:25:29 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Mar 2014 02:52:35 GMT",
"version": "v2"
}
] | 2014-04-17 | [
[
"Brannlund",
"Johan",
""
],
[
"DeBenedictis",
"Andrew",
""
],
[
"Lauman",
"Alison",
""
]
] | We consider the quantization of space-times which can possess different topologies within a symmetry reduced version of Wheeler-DeWitt theory. The quantum states are defined from a natural decomposition as an outer-product of a topological state, dictating the topology of the two-surfaces of the space-time, and a geome... |
1703.10791 | Jens Boos | Jens Boos and Alberto Favaro | Kerr principal null directions from Bel--Robinson and Kummer surfaces | 4 pages, 10 figures. Essay written for the Gravity Research
Foundation 2017 Awards for Essays on Gravitation | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Kerr geometry, we calculate various surfaces of constant curvature
invariants. These extend well beyond the Kerr horizon, and we argue that they
might be of observational significance in connection with non-minimally coupled
matter fields. Moreover, we demonstrate that the principal null directions of
the Kerr... | [
{
"created": "Fri, 31 Mar 2017 08:30:36 GMT",
"version": "v1"
}
] | 2017-04-03 | [
[
"Boos",
"Jens",
""
],
[
"Favaro",
"Alberto",
""
]
] | In the Kerr geometry, we calculate various surfaces of constant curvature invariants. These extend well beyond the Kerr horizon, and we argue that they might be of observational significance in connection with non-minimally coupled matter fields. Moreover, we demonstrate that the principal null directions of the Kerr g... |
2004.02902 | Jose Natario | J\'essica Gon\c{c}alves, Jos\'e Nat\'ario | Proof of the weak cosmic censorship conjecture for several extremal
black holes | 16 pages, no figures; v2: minor changes, references added, matches
final published version | Gen. Rel. Grav. 52 (2020) 94 | 10.1007/s10714-020-02735-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show explicitly, for different types of extremal black holes, that test
fields satisfying the null energy condition at the event horizon cannot violate
the weak cosmic censorship conjecture. This is done by checking, in each case,
that the hypotheses for the general theorem in [7] are satisfied.
| [
{
"created": "Mon, 6 Apr 2020 18:00:07 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Sep 2020 12:04:17 GMT",
"version": "v2"
}
] | 2020-09-22 | [
[
"Gonçalves",
"Jéssica",
""
],
[
"Natário",
"José",
""
]
] | We show explicitly, for different types of extremal black holes, that test fields satisfying the null energy condition at the event horizon cannot violate the weak cosmic censorship conjecture. This is done by checking, in each case, that the hypotheses for the general theorem in [7] are satisfied. |
1904.09864 | Yun Soo Myung | Yun Soo Myung, De-Cheng Zou | Stability of scalarized charged black holes in the
Einstein-Maxwell-Scalar theory | 23 pages, 11 figures. arXiv admin note: text overlap with
arXiv:1812.03604 | EPJC 79,641 (2019) | 10.1140/epjc/s10052-019-7176-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the stability of scalarized charged black holes in the
Einstein-Maxwell-Scalar (EMS) theory with quadratic coupling. These black holes
are labelled by the number of $n=0,1,2,\cdots$, where $n=0$ is called the
fundamental black hole and $n=1,2,\cdots$ denote the $n$-excited black holes.
We show that the $n=... | [
{
"created": "Fri, 19 Apr 2019 03:07:54 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2019 03:20:21 GMT",
"version": "v2"
}
] | 2019-08-15 | [
[
"Myung",
"Yun Soo",
""
],
[
"Zou",
"De-Cheng",
""
]
] | We analyze the stability of scalarized charged black holes in the Einstein-Maxwell-Scalar (EMS) theory with quadratic coupling. These black holes are labelled by the number of $n=0,1,2,\cdots$, where $n=0$ is called the fundamental black hole and $n=1,2,\cdots$ denote the $n$-excited black holes. We show that the $n=0$... |
2307.05542 | Gaoping Long | Gaoping Long | Parametrization of holonomy-flux phase space in the Hamiltonian
formulation of $SO(N)$ gauge field theory with $SO(D+1)$ loop quantum gravity
as an exemplification | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The $SO(N)$ Yang-Mills gauge theory is concerned since it can be used to
explore the new theory beyond the standard model of particle physics and the
higher dimensional loop quantum gravity. The canonical formulation and loop
quantization of $SO(N)$ Yang-Mills theory suggest a discrete $SO(N)$
holonomy-flux phase spa... | [
{
"created": "Sat, 8 Jul 2023 19:34:21 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2023 00:10:04 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Dec 2023 16:53:39 GMT",
"version": "v3"
}
] | 2023-12-05 | [
[
"Long",
"Gaoping",
""
]
] | The $SO(N)$ Yang-Mills gauge theory is concerned since it can be used to explore the new theory beyond the standard model of particle physics and the higher dimensional loop quantum gravity. The canonical formulation and loop quantization of $SO(N)$ Yang-Mills theory suggest a discrete $SO(N)$ holonomy-flux phase space... |
1106.0920 | Gordon Belot | Gordon Belot | Background-Independence | Forthcoming in General Relativity and Gravitation | null | 10.1007/s10714-011-1210-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Intuitively speaking, a classical field theory is background-independent if
the structure required to make sense of its equations is itself subject to
dynamical evolution, rather than being imposed ab initio. The aim of this paper
is to provide an explication of this intuitive notion. Background-independence
is not a... | [
{
"created": "Sun, 5 Jun 2011 18:11:11 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Belot",
"Gordon",
""
]
] | Intuitively speaking, a classical field theory is background-independent if the structure required to make sense of its equations is itself subject to dynamical evolution, rather than being imposed ab initio. The aim of this paper is to provide an explication of this intuitive notion. Background-independence is not a n... |
0802.0992 | Roberto Giambo' | R. Giamb\'o, F. Giannoni, G. Magli | Genericity of blackhole formation in the gravitational collapse of
homogeneous self-interacting scalar fields | 18 pages, 4 figures | J.Math.Phys.49:042504,2008 | 10.1063/1.2907949 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational collapse of a wide class of self-interacting homogeneous
scalar fields models is analyzed. The class is characterized by certain general
conditions on the scalar field potential, which, in particular, include both
asymptotically polynomial and exponential behaviors. Within this class, we show
that t... | [
{
"created": "Thu, 7 Feb 2008 14:46:34 GMT",
"version": "v1"
}
] | 2010-03-24 | [
[
"Giambó",
"R.",
""
],
[
"Giannoni",
"F.",
""
],
[
"Magli",
"G.",
""
]
] | The gravitational collapse of a wide class of self-interacting homogeneous scalar fields models is analyzed. The class is characterized by certain general conditions on the scalar field potential, which, in particular, include both asymptotically polynomial and exponential behaviors. Within this class, we show that the... |
1812.11123 | Alan Kostelecky | Cheng-Gang Shao, Ya-Fen Chen, Yu-Jie Tan, Shan-Qing Yang, Jun Luo,
Michael Edmund Tobar, J.C. Long, E. Weisman, Alan Kostelecky | Combined Search for a Lorentz-Violating Force in Short-Range Gravity
Varying as the Inverse Sixth Power of Distance | 7 pages two-column REVTeX, accepted for publication in Physical
Review Letters | null | 10.1103/PhysRevLett.122.011102 | null | gr-qc hep-ex hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision measurements of the inverse-square law via experiments on
short-range gravity provide sensitive tests of Lorentz symmetry. A combined
analysis of data from experiments at the Huazhong University of Science and
Technology and Indiana University sets simultaneous limits on all 22
coefficients for Lorentz viol... | [
{
"created": "Fri, 28 Dec 2018 17:36:59 GMT",
"version": "v1"
}
] | 2019-01-23 | [
[
"Shao",
"Cheng-Gang",
""
],
[
"Chen",
"Ya-Fen",
""
],
[
"Tan",
"Yu-Jie",
""
],
[
"Yang",
"Shan-Qing",
""
],
[
"Luo",
"Jun",
""
],
[
"Tobar",
"Michael Edmund",
""
],
[
"Long",
"J. C.",
""
],
[
"Weism... | Precision measurements of the inverse-square law via experiments on short-range gravity provide sensitive tests of Lorentz symmetry. A combined analysis of data from experiments at the Huazhong University of Science and Technology and Indiana University sets simultaneous limits on all 22 coefficients for Lorentz violat... |
2402.10190 | Ryan Unger | Christoph Kehle and Ryan Unger | Extremal black hole formation as a critical phenomenon | 91 pages + references, 16 figures | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we prove that extremal black holes arise on the threshold of
gravitational collapse. More precisely, we construct smooth one-parameter
families of smooth, spherically symmetric solutions to the
Einstein-Maxwell-Vlasov system which interpolate between dispersion and
collapse and for which the critical s... | [
{
"created": "Thu, 15 Feb 2024 18:46:40 GMT",
"version": "v1"
}
] | 2024-02-16 | [
[
"Kehle",
"Christoph",
""
],
[
"Unger",
"Ryan",
""
]
] | In this paper, we prove that extremal black holes arise on the threshold of gravitational collapse. More precisely, we construct smooth one-parameter families of smooth, spherically symmetric solutions to the Einstein-Maxwell-Vlasov system which interpolate between dispersion and collapse and for which the critical sol... |
2112.13249 | Yuchen Huang | Yuchen Huang and Jun Tao | Thermodynamics and phase transition of BTZ black hole in a cavity | 28 pages, 8 figures, to be published in Nuclear Physics B | Nuclear Physics B 982 (2022) 115881 | 10.1016/j.nuclphysb.2022.115881 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the thermodynamics and phase transition of a BTZ
black hole in a finite space region, namely a cavity. By imposing a
temperature-fixed boundary condition on the wall of the cavity and evaluating
the Euclidean action, we derive the thermodynamic quantities and then construct
the first law of th... | [
{
"created": "Sat, 25 Dec 2021 15:25:44 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jan 2022 15:56:52 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jun 2022 08:34:48 GMT",
"version": "v3"
}
] | 2022-08-25 | [
[
"Huang",
"Yuchen",
""
],
[
"Tao",
"Jun",
""
]
] | In this paper, we study the thermodynamics and phase transition of a BTZ black hole in a finite space region, namely a cavity. By imposing a temperature-fixed boundary condition on the wall of the cavity and evaluating the Euclidean action, we derive the thermodynamic quantities and then construct the first law of ther... |
gr-qc/0105062 | Julio Cesar Fabris | F.G. Alvarenga, J.C. Fabris, S.V.B. Goncalves and J.A.O. Marinho
(Departamento de Fisica, Universidade Federal do Espirito Santo, Brazil) | An analysis of helium primordial nucleosynthesis with a variable
cosmological coupling | Latex file, 10 pages | Braz.J.Phys.31:546-551,2001 | 10.1590/S0103-97332001000400004 | null | gr-qc astro-ph | null | The synthesis of helium in the early Universe depends on many input
parameters, including the value of the gravitational coupling during the period
when the nucleosynthesis takes place. We compute the primordial abundance of
helium as function of the gravitational coupling, using a semi-analytical
method, in order to... | [
{
"created": "Thu, 17 May 2001 20:12:31 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Alvarenga",
"F. G.",
"",
"Departamento de Fisica, Universidade Federal do Espirito Santo, Brazil"
],
[
"Fabris",
"J. C.",
"",
"Departamento de Fisica, Universidade Federal do Espirito Santo, Brazil"
],
[
"Goncalves",
"S. V. B.",
"",
"Departamento de Fisica,... | The synthesis of helium in the early Universe depends on many input parameters, including the value of the gravitational coupling during the period when the nucleosynthesis takes place. We compute the primordial abundance of helium as function of the gravitational coupling, using a semi-analytical method, in order to t... |
2104.14560 | Eric Linder | Eric V. Linder | Horndessence: $\Lambda$CDM Cosmology from Modified Gravity | 9 pages, 2 figures; v2 added references; v3 added appendix | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Rather than obtaining cosmic acceleration with a scalar field potential
(quintessence) or noncanonical kinetic term (k-essence), we can do it purely
through a modified gravity braiding of the scalar and metric, i.e. the $G_3$
Horndeski action term. Such "Horndessence" allows an exact $\Lambda$CDM
cosmological expansi... | [
{
"created": "Wed, 28 Apr 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2021 16:04:07 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Dec 2021 18:08:26 GMT",
"version": "v3"
}
] | 2021-12-24 | [
[
"Linder",
"Eric V.",
""
]
] | Rather than obtaining cosmic acceleration with a scalar field potential (quintessence) or noncanonical kinetic term (k-essence), we can do it purely through a modified gravity braiding of the scalar and metric, i.e. the $G_3$ Horndeski action term. Such "Horndessence" allows an exact $\Lambda$CDM cosmological expansion... |
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