id stringlengths 9 13 | submitter stringlengths 1 64 ⌀ | authors stringlengths 5 22.9k | title stringlengths 4 245 | comments stringlengths 1 548 ⌀ | journal-ref stringlengths 4 362 ⌀ | doi stringlengths 12 82 ⌀ | report-no stringlengths 2 281 ⌀ | categories stringclasses 793
values | license stringclasses 9
values | orig_abstract stringlengths 24 1.95k | versions listlengths 1 30 | update_date stringlengths 10 10 | authors_parsed listlengths 1 1.74k | abstract stringlengths 21 1.95k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0509013 | Jonathan Halliwell | J.J.Halliwell and P.Wallden | Invariant Class Operators in the Decoherent Histories Analysis of
Timeless Quantum Theories | 45 pages, RevTex. Version 2. Substantial rewriting of Section 9
correcting earlier errors | Phys.Rev. D73 (2006) 024011 | 10.1103/PhysRevD.73.024011 | Imperial-TP | gr-qc | null | The decoherent histories approach to quantum theory is applied to a class of
reparametrization invariant models, which includes systems described by the
Klein-Gordon equation, and by a minisuperspace Wheeler-DeWitt equation. A key
step in this approach is the construction of class operators characterizing the
questio... | [
{
"created": "Fri, 2 Sep 2005 12:23:51 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2005 13:53:13 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Halliwell",
"J. J.",
""
],
[
"Wallden",
"P.",
""
]
] | The decoherent histories approach to quantum theory is applied to a class of reparametrization invariant models, which includes systems described by the Klein-Gordon equation, and by a minisuperspace Wheeler-DeWitt equation. A key step in this approach is the construction of class operators characterizing the questions... |
2006.15914 | Kazuya Koyama | Kazuya Koyama | Testing Brans-Dicke Gravity with Screening by Scalar Gravitational Wave
Memory | 6 pages, 5 figures, accepted for publication in PRD | null | 10.1103/PhysRevD.102.021502 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Brans-Dicke theory of gravity is one of the oldest ideas to extend
general relativity by introducing a non-minimal coupling between the scalar
field and gravity. The Solar System tests put tight constraints on the theory.
In order to evade these constraints, various screening mechanisms have been
proposed. These ... | [
{
"created": "Mon, 29 Jun 2020 10:11:51 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Koyama",
"Kazuya",
""
]
] | The Brans-Dicke theory of gravity is one of the oldest ideas to extend general relativity by introducing a non-minimal coupling between the scalar field and gravity. The Solar System tests put tight constraints on the theory. In order to evade these constraints, various screening mechanisms have been proposed. These sc... |
gr-qc/0309100 | Paul S. Wesson | Paul S. Wesson | Is Mass Quantized? | null | Mod.Phys.Lett.A19:1995-2000,2004 | 10.1142/S0217732304015270 | null | gr-qc | null | The cosmological constant combined with Planck's constant and the speed of
light implies a quantum of mass of approximately 2 x 10^{-65}g. This follows
either from a generic dimensional analysis, or from a specific analysis where
the cosmological constant appears in 4D spacetime as the result of a
dimensional reducti... | [
{
"created": "Sat, 20 Sep 2003 14:13:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Wesson",
"Paul S.",
""
]
] | The cosmological constant combined with Planck's constant and the speed of light implies a quantum of mass of approximately 2 x 10^{-65}g. This follows either from a generic dimensional analysis, or from a specific analysis where the cosmological constant appears in 4D spacetime as the result of a dimensional reduction... |
2306.13726 | Jiamin Hou | Jiamin Hou and Julian Bautista and Maria Berti and Carolina
Cuesta-Lazaro and C\'esar Hern\'andez-Aguayo and Tilman Tr\"oster and Jinglan
Zheng | Cosmological Probes of Structure Growth and Tests of Gravity | 72 pages, 19 figures, Invited review for Universe, Special Issue
"Cosmological Constant" | null | 10.3390/universe9070302 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current standard cosmological model is constructed within the framework
of general relativity with a cosmological constant $\Lambda$, which is often
associated with dark energy, and phenomenologically explains the accelerated
cosmic expansion. Understanding the nature of dark energy is one of the most
appealing q... | [
{
"created": "Fri, 23 Jun 2023 18:21:00 GMT",
"version": "v1"
}
] | 2023-06-27 | [
[
"Hou",
"Jiamin",
""
],
[
"Bautista",
"Julian",
""
],
[
"Berti",
"Maria",
""
],
[
"Cuesta-Lazaro",
"Carolina",
""
],
[
"Hernández-Aguayo",
"César",
""
],
[
"Tröster",
"Tilman",
""
],
[
"Zheng",
"Jinglan",
""... | The current standard cosmological model is constructed within the framework of general relativity with a cosmological constant $\Lambda$, which is often associated with dark energy, and phenomenologically explains the accelerated cosmic expansion. Understanding the nature of dark energy is one of the most appealing que... |
1203.0214 | Sean Stotyn | Sean Stotyn and Robert B. Mann | Another Mass Gap in the BTZ Geometry? | 13 pages, 2 appendices, Invited Contribution to an IOP special volume
of Journal of Physics A in honor of Stuart Dowker's 75th birthday, v2:
discussion in section 4 expanded | null | 10.1088/1751-8113/45/37/374025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We attempt the construction of perturbative rotating hairy black holes and
boson stars, invariant under a single helical Killing field, in 2+1-dimensions
to complete the perturbative analysis in arbitrary odd dimension recently put
forth in \cite{Stotyn:2011ns}. Unlike the higher dimensional cases, we find
evidence f... | [
{
"created": "Thu, 1 Mar 2012 15:32:08 GMT",
"version": "v1"
},
{
"created": "Sat, 26 May 2012 20:56:58 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Stotyn",
"Sean",
""
],
[
"Mann",
"Robert B.",
""
]
] | We attempt the construction of perturbative rotating hairy black holes and boson stars, invariant under a single helical Killing field, in 2+1-dimensions to complete the perturbative analysis in arbitrary odd dimension recently put forth in \cite{Stotyn:2011ns}. Unlike the higher dimensional cases, we find evidence for... |
gr-qc/9808020 | Christian Maulbetsch | Christian Maulbetsch and Sergei V. Shabanov (Institute for Theoretical
Physics, FU-Berlin) | The Inverse Variational Problem for Autoparallels | 13 pages, plain Latex, no figures | J.Phys.A32:5355-5366,1999 | 10.1088/0305-4470/32/28/313 | null | gr-qc hep-th math-ph math.MP quant-ph | null | We study the problem of the existence of a local quantum scalar field theory
in a general affine metric space that in the semiclassical approximation would
lead to the autoparallel motion of wave packets, thus providing a deviation of
the spinless particle trajectory from the geodesics in the presence of torsion.
The... | [
{
"created": "Fri, 7 Aug 1998 16:34:09 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Aug 1998 20:00:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Maulbetsch",
"Christian",
"",
"Institute for Theoretical\n Physics, FU-Berlin"
],
[
"Shabanov",
"Sergei V.",
"",
"Institute for Theoretical\n Physics, FU-Berlin"
]
] | We study the problem of the existence of a local quantum scalar field theory in a general affine metric space that in the semiclassical approximation would lead to the autoparallel motion of wave packets, thus providing a deviation of the spinless particle trajectory from the geodesics in the presence of torsion. The p... |
1204.1714 | Kourosh Nozari | Kourosh Nozari and M. Shoukrani | On the dissipative non-minimal braneworld inflation | 32 pages, 6 figures. arXiv admin note: substantial text overlap with
arXiv:1001.0444 | Astrophys. Space Sci. 339 (2012) 111 | 10.1007/s10509-012-0980-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of the non-minimal coupling on the dissipative dynamics
of the warm inflation in a braneworld setup, where the inflaton field is
non-minimally coupled to induced gravity on the warped DGP brane. We study with
details the effects of the non-minimal coupling and dissipation on the
inflationary dyna... | [
{
"created": "Sun, 8 Apr 2012 07:29:55 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Nozari",
"Kourosh",
""
],
[
"Shoukrani",
"M.",
""
]
] | We study the effects of the non-minimal coupling on the dissipative dynamics of the warm inflation in a braneworld setup, where the inflaton field is non-minimally coupled to induced gravity on the warped DGP brane. We study with details the effects of the non-minimal coupling and dissipation on the inflationary dynami... |
1407.3317 | Edgar Gasperin | Edgar Gasperin, Juan Antonio Valiente Kroon | Spinorial Wave Equations and Stability of the Milne Spacetime | 37 pages, 2 figures | null | 10.1088/0264-9381/32/18/185021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spinorial version of the conformal vacuum Einstein field equations are
used to construct a system of quasilinear wave equations for the various
conformal fields. As a part of the analysis we also show how to construct a
subsidiary system of wave equations for the zero quantities associated to the
various conforma... | [
{
"created": "Fri, 11 Jul 2014 22:28:40 GMT",
"version": "v1"
}
] | 2015-09-23 | [
[
"Gasperin",
"Edgar",
""
],
[
"Kroon",
"Juan Antonio Valiente",
""
]
] | The spinorial version of the conformal vacuum Einstein field equations are used to construct a system of quasilinear wave equations for the various conformal fields. As a part of the analysis we also show how to construct a subsidiary system of wave equations for the zero quantities associated to the various conformal ... |
1904.04293 | Jun Chen | Jun Chen | Reconstruction of inflation model from tensor-to-scalar ratio | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconstruct the potential of minimally coupling inflation model which
produces small value of the tensor-scalar ratio. In these inflation models,
tensor-scalar ratio is proportional to 1/N^2 scalar spectral index is in good
agreement with recent cosmological observations, in which N is the e-folding
number and p i... | [
{
"created": "Mon, 8 Apr 2019 18:42:56 GMT",
"version": "v1"
}
] | 2019-04-10 | [
[
"Chen",
"Jun",
""
]
] | We reconstruct the potential of minimally coupling inflation model which produces small value of the tensor-scalar ratio. In these inflation models, tensor-scalar ratio is proportional to 1/N^2 scalar spectral index is in good agreement with recent cosmological observations, in which N is the e-folding number and p is ... |
gr-qc/0611106 | Ryszard Manka | R. Manka and D. Panchyrz | The Friedman Universe with the stochastic cosmological constant | JHEP3 style, 7 pages, 1 figure | null | null | null | gr-qc | null | The Friedman Universe with the remnant stochastic scalar field in the hybrid
inflation model is examined. It is shown that the small effective cosmological
constant appears which increases the cosmological expansion.
| [
{
"created": "Mon, 20 Nov 2006 14:00:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Manka",
"R.",
""
],
[
"Panchyrz",
"D.",
""
]
] | The Friedman Universe with the remnant stochastic scalar field in the hybrid inflation model is examined. It is shown that the small effective cosmological constant appears which increases the cosmological expansion. |
1305.3851 | Li Xiang | Li Xiang, Yi Ling and You Gen Shen | Singularities and the Finale of Black Hole Evaporation | 10 pages | Int. J. Mod. Phys. D22(2013), 1342016 | 10.1142/S0218271813420169 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this essay we argue that once quantum gravitational effects change the
classical geometry of a black hole and remove the curvature singularity, the
black hole would not evaporate entirely but approach a remnant. In a modified
Schwarzschild spacetime characterized by a finite Kretschmann scalar, a minimal
mass of t... | [
{
"created": "Thu, 16 May 2013 16:04:11 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Xiang",
"Li",
""
],
[
"Ling",
"Yi",
""
],
[
"Shen",
"You Gen",
""
]
] | In this essay we argue that once quantum gravitational effects change the classical geometry of a black hole and remove the curvature singularity, the black hole would not evaporate entirely but approach a remnant. In a modified Schwarzschild spacetime characterized by a finite Kretschmann scalar, a minimal mass of the... |
gr-qc/9806117 | Jean-Philippe Uzan | Jean-Philippe Uzan | The No-defect Conjecture: Cosmological Implications | 4 pages, 1 figure, accepted for publication as a brief report in
Phys. Rev. D | Phys.Rev.D58:087301,1998 | 10.1103/PhysRevD.58.087301 | null | gr-qc | null | When the topology of the universe is non trivial, it has been shown that
there are constraints on the network of domain walls, cosmic strings and
monopoles. I generalize these results to textures and study the cosmological
implications of such constraints. I conclude that a large class of
multi-connected universes wi... | [
{
"created": "Tue, 30 Jun 1998 14:28:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Uzan",
"Jean-Philippe",
""
]
] | When the topology of the universe is non trivial, it has been shown that there are constraints on the network of domain walls, cosmic strings and monopoles. I generalize these results to textures and study the cosmological implications of such constraints. I conclude that a large class of multi-connected universes with... |
1107.5987 | Cristina Rugina | G. W. Gibbons and C. Rugina | Goryachev-Chaplygin, Kovalevskaya, and Brdi\v{c}ka-Eardley-Nappi-Witten
pp-waves spacetimes with higher rank St\"ackel-Killing tensors | 11 pages; accepted for publication in JMP | null | 10.1063/1.3664754 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hidden symmetries of the Goryachev-Chaplygin and Kovalevskaya gyrostats
spacetimes, as well as the Brdi\v{c}ka-Eardley-Nappi-Witten pp-waves are
studied. We find out that these spacetimes possess higher rank
St\"ackel-Killing tensors and that in the case of the pp-wave spacetimes the
symmetry group of the St\"ackel-K... | [
{
"created": "Fri, 29 Jul 2011 14:55:50 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Nov 2011 10:20:00 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Gibbons",
"G. W.",
""
],
[
"Rugina",
"C.",
""
]
] | Hidden symmetries of the Goryachev-Chaplygin and Kovalevskaya gyrostats spacetimes, as well as the Brdi\v{c}ka-Eardley-Nappi-Witten pp-waves are studied. We find out that these spacetimes possess higher rank St\"ackel-Killing tensors and that in the case of the pp-wave spacetimes the symmetry group of the St\"ackel-Kil... |
0711.0188 | Scott A. Hughes | Scott A. Hughes | LISA sources and science | 8 pages, 2 figures. For the Proceedings of the 7th Edoardo Amaldi
Conference on Gravitational Waves (to be published by Classical and Quantum
Gravity) | null | null | null | gr-qc astro-ph | null | LISA is a planned space-based gravitational-wave (GW) detector that would be
sensitive to waves from low-frequency sources, in the band of roughly (0.03 -
0.1) mHz < f < 0.1 Hz. This is expected to be an extremely rich chunk of the GW
spectrum -- observing these waves will provide a unique view of dynamical
processes... | [
{
"created": "Thu, 1 Nov 2007 19:02:54 GMT",
"version": "v1"
}
] | 2007-11-02 | [
[
"Hughes",
"Scott A.",
""
]
] | LISA is a planned space-based gravitational-wave (GW) detector that would be sensitive to waves from low-frequency sources, in the band of roughly (0.03 - 0.1) mHz < f < 0.1 Hz. This is expected to be an extremely rich chunk of the GW spectrum -- observing these waves will provide a unique view of dynamical processes i... |
2009.07458 | Snehasish Bhattacharjee | Snehasish Bhattacharjee | Configurational entropy in $f(T)$ gravity | Published in EPJ Plus | Eur. Phys. J. Plus 135, 760 (2020) | 10.1140/epjp/s13360-020-00782-1 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The evolution of the configurational entropy of the universe relies on the
growth rate of density fluctuations and on the Hubble parameter. In this work,
I present the evolution of configurational entropy for the power-law $f(T)$
gravity model of the form $f(T) = \zeta (-T)^ b$, where, $\zeta = (6
H_{0}^{2})^{(1-s)}\... | [
{
"created": "Wed, 16 Sep 2020 04:15:44 GMT",
"version": "v1"
}
] | 2020-09-28 | [
[
"Bhattacharjee",
"Snehasish",
""
]
] | The evolution of the configurational entropy of the universe relies on the growth rate of density fluctuations and on the Hubble parameter. In this work, I present the evolution of configurational entropy for the power-law $f(T)$ gravity model of the form $f(T) = \zeta (-T)^ b$, where, $\zeta = (6 H_{0}^{2})^{(1-s)}\fr... |
gr-qc/9901074 | Larry Ford | L.H. Ford and Thomas A. Roman | The Quantum Interest Conjecture | 17 pages, Latex, 3 figures, uses epsf | Phys. Rev. D 60, 104018 (1999) | 10.1103/PhysRevD.60.104018 | null | gr-qc hep-th quant-ph | null | Although quantum field theory allows local negative energy densities and
fluxes, it also places severe restrictions upon the magnitude and extent of the
negative energy. The restrictions take the form of quantum inequalities. These
inequalities imply that a pulse of negative energy must not only be followed by
a comp... | [
{
"created": "Tue, 26 Jan 1999 17:10:21 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Ford",
"L. H.",
""
],
[
"Roman",
"Thomas A.",
""
]
] | Although quantum field theory allows local negative energy densities and fluxes, it also places severe restrictions upon the magnitude and extent of the negative energy. The restrictions take the form of quantum inequalities. These inequalities imply that a pulse of negative energy must not only be followed by a compen... |
2008.03879 | Alexandru Lupsasca | Samuel E. Gralla, Alexandru Lupsasca, Daniel P. Marrone | The Shape of the Black Hole Photon Ring: A Precise Test of Strong-Field
General Relativity | 20 pages, 9 figures. v2: minor changes | null | 10.1103/PhysRevD.102.124004 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new test of strong-field general relativity (GR) based on the
universal interferometric signature of the black hole photon ring. The photon
ring is a narrow ring-shaped feature, predicted by GR but not yet observed,
that appears on images of sources near a black hole. It is caused by extreme
bending of l... | [
{
"created": "Mon, 10 Aug 2020 03:16:42 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2020 03:00:53 GMT",
"version": "v2"
}
] | 2020-12-09 | [
[
"Gralla",
"Samuel E.",
""
],
[
"Lupsasca",
"Alexandru",
""
],
[
"Marrone",
"Daniel P.",
""
]
] | We propose a new test of strong-field general relativity (GR) based on the universal interferometric signature of the black hole photon ring. The photon ring is a narrow ring-shaped feature, predicted by GR but not yet observed, that appears on images of sources near a black hole. It is caused by extreme bending of lig... |
0903.0774 | Wlodzimierz Piechocki | Przemyslaw Malkiewicz and Wlodzimierz Piechocki | Classical membrane in a time dependent orbifold | 10 pages, no figures, revtex4; version submitted for publication | null | null | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | We analyze classical theory of a membrane propagating in a singular
background spacetime. The algebra of the first-class constraints of the system
defines the membrane dynamics. A membrane winding uniformly around compact
dimension of embedding spacetime is described by two constraints, which are
interpreted in terms... | [
{
"created": "Wed, 4 Mar 2009 14:37:02 GMT",
"version": "v1"
},
{
"created": "Sun, 10 May 2009 14:03:42 GMT",
"version": "v2"
}
] | 2009-05-10 | [
[
"Malkiewicz",
"Przemyslaw",
""
],
[
"Piechocki",
"Wlodzimierz",
""
]
] | We analyze classical theory of a membrane propagating in a singular background spacetime. The algebra of the first-class constraints of the system defines the membrane dynamics. A membrane winding uniformly around compact dimension of embedding spacetime is described by two constraints, which are interpreted in terms o... |
1104.1925 | Isha Pahwa | Isha Pahwa, Debajyoti Choudhury and T.R. Seshadri | Late-time acceleration in Higher Dimensional Cosmology | 10 pages, 5 figures | JCAP 1109 (2011) 015 | 10.1088/1475-7516/2011/09/015 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate late time acceleration of the universe in higher dimensional
cosmology. The content in the universe is assumed to exert pressure which is
different in the normal and extra dimensions. Cosmologically viable solutions
are found to exist for simple forms of the equation of state. The parameters of
the mod... | [
{
"created": "Mon, 11 Apr 2011 12:13:59 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Sep 2011 10:33:01 GMT",
"version": "v2"
}
] | 2011-09-29 | [
[
"Pahwa",
"Isha",
""
],
[
"Choudhury",
"Debajyoti",
""
],
[
"Seshadri",
"T. R.",
""
]
] | We investigate late time acceleration of the universe in higher dimensional cosmology. The content in the universe is assumed to exert pressure which is different in the normal and extra dimensions. Cosmologically viable solutions are found to exist for simple forms of the equation of state. The parameters of the model... |
2401.07495 | Yong-Zhuang Li | Yong-Zhuang Li and Xiao-Mei Kuang | Trajectories of photons around a rotating black hole with unusual
asymptotics | 12 pages, 7 figures | Eur. Phys. J. C (2024) 84:271 | 10.1140/epjc/s10052-024-12627-7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Most black hole solutions are characterized with asymptotically flat, or
asymptotically (anti) de-Sitter behaviors, but some black holes with unusual
asymptotics have also been constructed, which is believed to provide remarkable
insights into our understanding of the nature of gravity. In this paper,
focusing on a r... | [
{
"created": "Mon, 15 Jan 2024 06:27:25 GMT",
"version": "v1"
}
] | 2024-07-03 | [
[
"Li",
"Yong-Zhuang",
""
],
[
"Kuang",
"Xiao-Mei",
""
]
] | Most black hole solutions are characterized with asymptotically flat, or asymptotically (anti) de-Sitter behaviors, but some black holes with unusual asymptotics have also been constructed, which is believed to provide remarkable insights into our understanding of the nature of gravity. In this paper, focusing on a rot... |
2309.04114 | Morifumi Mizuno | Morifumi Mizuno, Teruaki Suyama, Ryuichi Takahashi | New Consistency Relations between Averages and Variances of Weakly
Lensed Signals of Gravitational Waves | 11 pages, 1 figure, accepted version | Phys. Rev. D 109, 083505 (2024) | 10.1103/PhysRevD.109.083505 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The lensing of gravitational waves (GWs) occurs when GWs experience local
gravitational potential. In the weak lensing regime, it has been reported that
a simple consistency relation holds between the variances of the magnification
and phase modulation. In this paper, we present two additional consistency
relations b... | [
{
"created": "Fri, 8 Sep 2023 04:27:10 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2024 21:41:23 GMT",
"version": "v2"
}
] | 2024-04-10 | [
[
"Mizuno",
"Morifumi",
""
],
[
"Suyama",
"Teruaki",
""
],
[
"Takahashi",
"Ryuichi",
""
]
] | The lensing of gravitational waves (GWs) occurs when GWs experience local gravitational potential. In the weak lensing regime, it has been reported that a simple consistency relation holds between the variances of the magnification and phase modulation. In this paper, we present two additional consistency relations bet... |
2008.09430 | Maximilian Becker | Maximilian Becker and Martin Reuter | Background Independent Field Quantization with Sequences of
Gravity-Coupled Approximants | 53 pages, 3 figures | null | 10.1103/PhysRevD.102.125001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We outline, test, and apply a new scheme for nonpertubative analyses of
quantized field systems in contact with dynamical gravity. While gravity is
treated classically in the present paper, the approach lends itself for a
generalization to full Quantum Gravity. We advocate the point of view that
quantum field theorie... | [
{
"created": "Fri, 21 Aug 2020 11:49:36 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2020 14:41:38 GMT",
"version": "v2"
}
] | 2020-12-30 | [
[
"Becker",
"Maximilian",
""
],
[
"Reuter",
"Martin",
""
]
] | We outline, test, and apply a new scheme for nonpertubative analyses of quantized field systems in contact with dynamical gravity. While gravity is treated classically in the present paper, the approach lends itself for a generalization to full Quantum Gravity. We advocate the point of view that quantum field theories ... |
1007.3150 | Adrian Tanasa | Thomas Krajewski, Jacques Magnen, Vincent Rivasseau, Adrian Tanasa and
Patrizia Vitale | Quantum Corrections in the Group Field Theory Formulation of the EPRL/FK
Models | 36 pages, 5 figures; an appendix giving a more precise behaviour of
the degenerate configuration case has been added; further comments on
geometrogenesis as a group field theory phase transition are given; version
accepted for publication in Phys Rev D | Phys.Rev.D82:124069,2010 | 10.1103/PhysRevD.82.124069 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the group field theory formulation of the EPRL/FK spin foam
models. These models aim at a dynamical, i.e. non-topological formulation of 4D
quantum gravity. We introduce a saddle point method for general group field
theory amplitudes and compare it with existing results, in particular for a
second orde... | [
{
"created": "Mon, 19 Jul 2010 13:52:40 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Nov 2010 16:41:39 GMT",
"version": "v2"
}
] | 2011-03-07 | [
[
"Krajewski",
"Thomas",
""
],
[
"Magnen",
"Jacques",
""
],
[
"Rivasseau",
"Vincent",
""
],
[
"Tanasa",
"Adrian",
""
],
[
"Vitale",
"Patrizia",
""
]
] | We investigate the group field theory formulation of the EPRL/FK spin foam models. These models aim at a dynamical, i.e. non-topological formulation of 4D quantum gravity. We introduce a saddle point method for general group field theory amplitudes and compare it with existing results, in particular for a second order ... |
2308.05130 | Alireza Amani | Alireza Amani, A. S. Kubeka, and E. Mahichi | Bouncing cosmology and dynamical analysis of stability with non-minimal
kinetic coupled gravity | 20 pages, 9 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this paper, we model the bounce phase, stability and the reconstruction of
the universe by non-minimal kinetic coupling. In the process, we obtained
importance information about the energy density and the matter pressure of the
universe in relation to the previous universe through the bounce quantum phase.
The nov... | [
{
"created": "Wed, 9 Aug 2023 10:56:52 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2024 22:43:42 GMT",
"version": "v2"
}
] | 2024-07-08 | [
[
"Amani",
"Alireza",
""
],
[
"Kubeka",
"A. S.",
""
],
[
"Mahichi",
"E.",
""
]
] | In this paper, we model the bounce phase, stability and the reconstruction of the universe by non-minimal kinetic coupling. In the process, we obtained importance information about the energy density and the matter pressure of the universe in relation to the previous universe through the bounce quantum phase. The novel... |
1801.10594 | Debabrata Deb | M.K. Jasim, Debabrata Deb, Saibal Ray, Y.K. Gupta, and Sourav Roy
Chowdhury | Anisotropic strange stars in Tolman-Kuchowicz spacetime | 18 pages, 10 figures | Eur. Phys. J. C (2018) 78:603 | 10.1140/epjc/s10052-018-6072-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We attempt to study a singularity-free model for the spherically symmetric
anisotropic strange stars under Einstein's general theory of relativity by
exploiting the Tolman-Kuchowicz metric. Further, we have assumed that the
cosmological constant $\Lambda$ is a scalar variable dependent on the spatial
coordinate $r$. ... | [
{
"created": "Wed, 31 Jan 2018 18:31:52 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Oct 2018 07:55:50 GMT",
"version": "v2"
}
] | 2018-10-03 | [
[
"Jasim",
"M. K.",
""
],
[
"Deb",
"Debabrata",
""
],
[
"Ray",
"Saibal",
""
],
[
"Gupta",
"Y. K.",
""
],
[
"Chowdhury",
"Sourav Roy",
""
]
] | We attempt to study a singularity-free model for the spherically symmetric anisotropic strange stars under Einstein's general theory of relativity by exploiting the Tolman-Kuchowicz metric. Further, we have assumed that the cosmological constant $\Lambda$ is a scalar variable dependent on the spatial coordinate $r$. To... |
0808.2830 | Joel Saavedra | Sergio del Campo, Ramon Herrera, Pedro Labrana, Carlos Leiva and Joel
Saavedra | Tachyonic Universes in Patch Cosmologies with $\Omega>1$ | 15 pages, 2 figures. Accepted by Modern Physics Letters A | null | 10.1142/S0217732309030849 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we study closed inflationary universe models by means of a
tachyonic field. We described a general treatment for created a universe with
$\Omega>1$ in patch cosmology, which is able to represent General Relativity,
Gauss-Bonnet or Randall-Sundrum patches. We use recent data from astronomical
observati... | [
{
"created": "Wed, 20 Aug 2008 22:28:58 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2009 21:34:36 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"del Campo",
"Sergio",
""
],
[
"Herrera",
"Ramon",
""
],
[
"Labrana",
"Pedro",
""
],
[
"Leiva",
"Carlos",
""
],
[
"Saavedra",
"Joel",
""
]
] | In this article we study closed inflationary universe models by means of a tachyonic field. We described a general treatment for created a universe with $\Omega>1$ in patch cosmology, which is able to represent General Relativity, Gauss-Bonnet or Randall-Sundrum patches. We use recent data from astronomical observation... |
0811.1916 | Francesco Cianfrani dr | Francesco Cianfrani, Giovanni Montani | Towards Loop Quantum Gravity without the time gauge | 5 pages, accepted for publication in Phys. Rev. Lett | Phys.Rev.Lett.102:091301,2009 | 10.1103/PhysRevLett.102.091301 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hamiltonian formulation of the Holst action is reviewed and it is
provided a solution of second-class constraints corresponding to a generic
local Lorentz frame. Within this scheme the form of rotation constraints can be
reduced to a Gauss-like one by a proper generalization of
Ashtekar-Barbero-Immirzi connection... | [
{
"created": "Wed, 12 Nov 2008 15:13:46 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 2009 17:35:44 GMT",
"version": "v2"
}
] | 2009-04-08 | [
[
"Cianfrani",
"Francesco",
""
],
[
"Montani",
"Giovanni",
""
]
] | The Hamiltonian formulation of the Holst action is reviewed and it is provided a solution of second-class constraints corresponding to a generic local Lorentz frame. Within this scheme the form of rotation constraints can be reduced to a Gauss-like one by a proper generalization of Ashtekar-Barbero-Immirzi connections.... |
1201.4853 | Edison Montoya | Alejandro Corichi, Edison Montoya | Effective Dynamics in Bianchi Type II Loop Quantum Cosmology | 24 pages, 26 figures | Phys. Rev. D 85, 104052 (2012) | 10.1103/PhysRevD.85.104052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We numerically investigate the solutions to the effective equations of the
Bianchi II model within the "improved" Loop Quantum Cosmology (LQC) dynamics.
The matter source is a massless scalar field. We perform a systematic study of
the space of solutions, and focus on the behavior of several geometrical
observables. ... | [
{
"created": "Mon, 23 Jan 2012 20:52:54 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2012 05:24:36 GMT",
"version": "v2"
}
] | 2012-10-08 | [
[
"Corichi",
"Alejandro",
""
],
[
"Montoya",
"Edison",
""
]
] | We numerically investigate the solutions to the effective equations of the Bianchi II model within the "improved" Loop Quantum Cosmology (LQC) dynamics. The matter source is a massless scalar field. We perform a systematic study of the space of solutions, and focus on the behavior of several geometrical observables. We... |
0812.4149 | Riccardo Sturani | S. Foffa and R. Sturani | Coherent detection method of gravitational wave bursts for spherical
antennas | 31 pages, 15 figures | Class.Quant.Grav.26:105013,2009 | 10.1088/0264-9381/26/10/105013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a comprehensive theoretical framework and a quantitative test of
the method we recently proposed for processing data from a spherical detector
with five or six transducers. Our algorithm is a trigger event generator
performing a coherent analysis of the sphere channels. In order to test our
pipeline we fir... | [
{
"created": "Mon, 22 Dec 2008 10:47:19 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Foffa",
"S.",
""
],
[
"Sturani",
"R.",
""
]
] | We provide a comprehensive theoretical framework and a quantitative test of the method we recently proposed for processing data from a spherical detector with five or six transducers. Our algorithm is a trigger event generator performing a coherent analysis of the sphere channels. In order to test our pipeline we first... |
gr-qc/0003076 | Garcia | L.C.Garcia de Andrade | Criteria for de Sitter inflation in Einstein-Cartan cosmology and COBE
data | Latex file | null | null | null | gr-qc | null | Criteria for the existence of de Sitter inflation with dilaton fields in
four-dimensional space-times with torsion is discussed.The relation between
matter density perturbation and the spin-density perturbation is stablished
based on this criteria.From COBE data it is shown that there is a linear
relationship between... | [
{
"created": "Sat, 18 Mar 2000 08:55:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | Criteria for the existence of de Sitter inflation with dilaton fields in four-dimensional space-times with torsion is discussed.The relation between matter density perturbation and the spin-density perturbation is stablished based on this criteria.From COBE data it is shown that there is a linear relationship between t... |
1109.3287 | Ninfa Radicella | Ninfa Radicella and Diego Pav\'on | Thermodynamical analysis on a braneworld scenario with curvature
corrections | 7 pages, 2 figures. Accepted for publication on PLB | null | 10.1016/j.physletb.2011.09.031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamics of some cosmological models based on modified
gravity, a braneworld with induced gravity and curvature effect. Dark energy
component seems necessary if the models are to approach thermal equilibrium in
the long run.
| [
{
"created": "Thu, 15 Sep 2011 08:25:54 GMT",
"version": "v1"
}
] | 2011-09-16 | [
[
"Radicella",
"Ninfa",
""
],
[
"Pavón",
"Diego",
""
]
] | We study the thermodynamics of some cosmological models based on modified gravity, a braneworld with induced gravity and curvature effect. Dark energy component seems necessary if the models are to approach thermal equilibrium in the long run. |
2306.01480 | Piero Nicolini | Piero Nicolini | How strings can explain regular black holes | 23 pages, 1 figure, invited contribution to "Regular Black Holes:
Towards a New Paradigm of Gravitational Collapse'', C. Bambi (ed), Springer,
Singapore | In: Bambi, C. (eds) Regular Black Holes. Springer Series in
Astrophysics and Cosmology. Springer, Singapore (2023) | 10.1007/978-981-99-1596-5_3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper reviews the role of black holes in the context of fundamental
physics. After recalling some basic results stemming from Planckian string
calculations, I present three examples of how stringy effects can improve the
curvature singularity of classical black hole geometries.
| [
{
"created": "Fri, 2 Jun 2023 12:07:33 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Nicolini",
"Piero",
""
]
] | This paper reviews the role of black holes in the context of fundamental physics. After recalling some basic results stemming from Planckian string calculations, I present three examples of how stringy effects can improve the curvature singularity of classical black hole geometries. |
1211.4107 | Oldrich Semerak | O. Semer\'ak and P. Sukov\'a | Free motion around black holes with discs or rings: between
integrability and chaos - II | 22 pages, 14 figures | MNRAS 425 (2012) 2455-2476 | 10.1111/j.1365-2966.2012.21630.x | null | gr-qc nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue the study of time-like geodesic dynamics in exact static, axially
and reflection symmetric space-times describing the fields of a Schwarzschild
black hole surrounded by thin discs or rings. In the previous paper, the rise
(and decline) of geodesic chaos with ring/disc mass and position and with test
parti... | [
{
"created": "Sat, 17 Nov 2012 10:05:06 GMT",
"version": "v1"
}
] | 2012-11-20 | [
[
"Semerák",
"O.",
""
],
[
"Suková",
"P.",
""
]
] | We continue the study of time-like geodesic dynamics in exact static, axially and reflection symmetric space-times describing the fields of a Schwarzschild black hole surrounded by thin discs or rings. In the previous paper, the rise (and decline) of geodesic chaos with ring/disc mass and position and with test particl... |
1708.00918 | Mandar Patil | Andrzej Kr\'olak and Mandar Patil | The First Detection of Gravitational Waves | 20 pages, 9 figures, Published in a special issue of Universe
"Varying Constants and Fundamental Cosmology" | Universe, 3(3), 59 (2017) | 10.3390/universe3030059 | null | gr-qc astro-ph.HE hep-ph hep-th physics.pop-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article deals with the first detection of gravitational waves by the
advanced Laser Interferometer Gravitational Wave Observatory (LIGO) detectors
on 14 September 2015, where the signal was generated by two stellar mass black
holes with masses 36 $ M_{\odot}$ and 29 $ M_{\odot}$ that merged to form a 62
$ M_{\od... | [
{
"created": "Wed, 2 Aug 2017 20:16:24 GMT",
"version": "v1"
}
] | 2017-08-04 | [
[
"Królak",
"Andrzej",
""
],
[
"Patil",
"Mandar",
""
]
] | This article deals with the first detection of gravitational waves by the advanced Laser Interferometer Gravitational Wave Observatory (LIGO) detectors on 14 September 2015, where the signal was generated by two stellar mass black holes with masses 36 $ M_{\odot}$ and 29 $ M_{\odot}$ that merged to form a 62 $ M_{\odot... |
gr-qc/0103095 | B. V. Ivanov | B.V.Ivanov | Pure-radiation gravitational fields with a simple twist and a Killing
vector | revtex, 9 pages | Phys.Rev.D61:064011,2000 | 10.1103/PhysRevD.61.064011 | null | gr-qc | null | Pure-radiation solutions are found, exploiting the analogy with the Euler-
Darboux equation for aligned colliding plane waves and the Euler-Tricomi
equation in hydrodynamics of two-dimensional flow. They do not depend on one of
the spacelike coordinates and comprise the Hauser solution as a special
subcase.
| [
{
"created": "Tue, 27 Mar 2001 08:42:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ivanov",
"B. V.",
""
]
] | Pure-radiation solutions are found, exploiting the analogy with the Euler- Darboux equation for aligned colliding plane waves and the Euler-Tricomi equation in hydrodynamics of two-dimensional flow. They do not depend on one of the spacelike coordinates and comprise the Hauser solution as a special subcase. |
2407.02017 | Marina David | Pablo A. Cano, Marina David | Teukolsky equation for near-extremal black holes beyond general
relativity: near-horizon analysis | 44 pages, 2 figures, ancillary Mathematica notebook included;
v2:references added, version sent to journal | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study gravitational perturbations on the near-horizon region of extremal
and near-extremal rotating black holes in a general higher-derivative extension
of Einstein gravity. We find a decoupled modified Teukolsky equation that rules
the gravitational perturbations and that separates into an angular and a radial
eq... | [
{
"created": "Tue, 2 Jul 2024 07:39:08 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jul 2024 13:45:27 GMT",
"version": "v2"
}
] | 2024-07-16 | [
[
"Cano",
"Pablo A.",
""
],
[
"David",
"Marina",
""
]
] | We study gravitational perturbations on the near-horizon region of extremal and near-extremal rotating black holes in a general higher-derivative extension of Einstein gravity. We find a decoupled modified Teukolsky equation that rules the gravitational perturbations and that separates into an angular and a radial equa... |
1201.1627 | Behnaz Fazlpour | A. Banijamali and B. Fazlpour | Phantom Behavior Bounce with Tachyon and Non-minimal Derivative Coupling | 15 pages, 8 figures, Accepted for publication in JCAP. arXiv admin
note: substantial text overlap with arXiv:1105.4967 | null | 10.1088/1475-7516/2012/01/039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The bouncing cosmology provides a successful solution of the cosmological
singularity problem. In this paper, we study the bouncing behavior of a single
scalar field model with tachyon field non-minimally coupled to itself, its
derivative and to the curvature. By utilizing the numerical calculations we
will show that... | [
{
"created": "Sun, 8 Jan 2012 12:26:19 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Banijamali",
"A.",
""
],
[
"Fazlpour",
"B.",
""
]
] | The bouncing cosmology provides a successful solution of the cosmological singularity problem. In this paper, we study the bouncing behavior of a single scalar field model with tachyon field non-minimally coupled to itself, its derivative and to the curvature. By utilizing the numerical calculations we will show that t... |
2406.12088 | Jos\'e Arturo B\'aez Mr. | A. Baez, Nora Breton and I. Cabrera-Munguia | Energy extraction from the Reissner-Nordstr\"om de Sitter black hole | 17 pages, 17 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The energy extraction from an electrostatic black hole by the decay or
splitting of electrically charged particles is analyzed. We determine the
energetic conditions that make the extraction process viable and present a
general expression for the efficiency in terms of the parameters of the
electrostatic black hole a... | [
{
"created": "Mon, 17 Jun 2024 21:00:22 GMT",
"version": "v1"
}
] | 2024-06-19 | [
[
"Baez",
"A.",
""
],
[
"Breton",
"Nora",
""
],
[
"Cabrera-Munguia",
"I.",
""
]
] | The energy extraction from an electrostatic black hole by the decay or splitting of electrically charged particles is analyzed. We determine the energetic conditions that make the extraction process viable and present a general expression for the efficiency in terms of the parameters of the electrostatic black hole and... |
gr-qc/0411056 | Amjad Ashoorioon | A. Ashoorioon, R.B. Mann | On the Tensor/Scalar Ratio in Inflation with UV Cutoff | 19 pages, 14 figures, to appear in Nucl. Phys. B; v4: typos
corrected, matched with the published version | Nucl.Phys. B716 (2005) 261-279 | 10.1016/j.nuclphysb.2005.03.033 | null | gr-qc astro-ph hep-th | null | Anisotropy of the cosmic microwave background radiation (CMB) originates from
both tensor and scalar perturbations. To study the characteristics of each of
these two kinds of perturbations, one has to determine the contribution of each
to the anisotropy of CMB. For example, the ratio of the power spectra of
tensor/sc... | [
{
"created": "Wed, 10 Nov 2004 22:33:58 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Nov 2004 20:50:07 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Mar 2005 17:49:17 GMT",
"version": "v3"
},
{
"created": "Fri, 20 May 2005 21:10:48 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Ashoorioon",
"A.",
""
],
[
"Mann",
"R. B.",
""
]
] | Anisotropy of the cosmic microwave background radiation (CMB) originates from both tensor and scalar perturbations. To study the characteristics of each of these two kinds of perturbations, one has to determine the contribution of each to the anisotropy of CMB. For example, the ratio of the power spectra of tensor/scal... |
0907.4280 | M. B. Altaie | M.B. Altaie | The Friedmann Paradigm: A critical review | Revtex4, 19 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Friedmann paradigm for a dynamical universe emanating from a spacetime
singularity is critically reviwed. Quantum effects, playing the essential role
at the very early stages, suggests that the universe may follow different
course to that presented by the standard Friedmann solutions. The investigation
of the bac... | [
{
"created": "Fri, 24 Jul 2009 13:19:59 GMT",
"version": "v1"
}
] | 2009-07-27 | [
[
"Altaie",
"M. B.",
""
]
] | The Friedmann paradigm for a dynamical universe emanating from a spacetime singularity is critically reviwed. Quantum effects, playing the essential role at the very early stages, suggests that the universe may follow different course to that presented by the standard Friedmann solutions. The investigation of the back-... |
2010.01682 | Graham Cox | Liam Bussey, Graham Cox and Hari Kunduri | Eigenvalues of the MOTS stability operator for slowly rotating Kerr
black holes | 12 pages; comments welcome! Main results have been generalized in v2 | General Relativity and Gravitation 53 (2021) | 10.1007/s10714-021-02786-3 | null | gr-qc math-ph math.MP math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the eigenvalues of the MOTS stability operator for the Kerr black
hole with angular momentum per unit mass $|a| \ll M$. We prove that each
eigenvalue depends analytically on $a$ (in a neighbourhood of $a=0$), and
compute its first nonvanishing derivative. Recalling that $a=0$ corresponds to
the Schwarzschild... | [
{
"created": "Sun, 4 Oct 2020 20:59:23 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2021 16:41:18 GMT",
"version": "v2"
}
] | 2021-02-01 | [
[
"Bussey",
"Liam",
""
],
[
"Cox",
"Graham",
""
],
[
"Kunduri",
"Hari",
""
]
] | We study the eigenvalues of the MOTS stability operator for the Kerr black hole with angular momentum per unit mass $|a| \ll M$. We prove that each eigenvalue depends analytically on $a$ (in a neighbourhood of $a=0$), and compute its first nonvanishing derivative. Recalling that $a=0$ corresponds to the Schwarzschild s... |
2302.08941 | Osmin Lacombe | Osmin Lacombe, Shinji Mukohyama | Multi-scalar theories of gravity with direct matter couplings and their
parametrized post-Newtonian parameters | 28 pages v2: published version, small modification of the abstract,
subsection 3.4 added | null | 10.1088/1475-7516/2023/08/054 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study theories of gravity including, in addition to the metric, several
scalar fields in the gravitational sector. The particularity of this work is
that we allow for direct couplings between these gravitating scalars and the
matter sector, which can generally be different for the source and the probe of
gravity, ... | [
{
"created": "Fri, 17 Feb 2023 15:25:21 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Aug 2023 17:15:11 GMT",
"version": "v2"
}
] | 2023-08-28 | [
[
"Lacombe",
"Osmin",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | We study theories of gravity including, in addition to the metric, several scalar fields in the gravitational sector. The particularity of this work is that we allow for direct couplings between these gravitating scalars and the matter sector, which can generally be different for the source and the probe of gravity, in... |
2203.07745 | Hugo Roussille | Hugo Roussille | A new look on black hole perturbations in modified gravity | Contribution to the 2022 Gravitation session of the 56th Rencontres
de Moriond | null | null | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We study the linear perturbations about a nonrotating black hole solution of
Horndeski's theory, using a systematic approach that extracts the asymptotic
behaviour of perturbations (at spatial infinity and near the horizon) directly
from the first-order radial differential system governing these perturbations
instead... | [
{
"created": "Tue, 15 Mar 2022 09:35:04 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 17:04:02 GMT",
"version": "v2"
}
] | 2022-03-17 | [
[
"Roussille",
"Hugo",
""
]
] | We study the linear perturbations about a nonrotating black hole solution of Horndeski's theory, using a systematic approach that extracts the asymptotic behaviour of perturbations (at spatial infinity and near the horizon) directly from the first-order radial differential system governing these perturbations instead o... |
1301.0221 | Remo Garattini | Remo Garattini and Francisco S. N. Lobo | Self-sustained traversable wormholes in modified gravity theories | 3 pages; contribution to the proceedings of the Thirteenth Marcel
Grossmann Meeting, Stockholm University, Sweden, 1-7 July, 2012; based on a
talk in the AT3 "Gravitational Fields with Sources, Regular Black Holes,
Quasiblack Holes, and Analog Black Holes" parallel session | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility that wormhole geometries are sustained by their
own quantum fluctuations, in the context of noncommutative geometry and
Gravity's Rainbow models. More specifically, the energy density of the graviton
one-loop contribution to a classical energy in a wormhole background is
considered as a se... | [
{
"created": "Wed, 2 Jan 2013 12:47:39 GMT",
"version": "v1"
}
] | 2013-01-03 | [
[
"Garattini",
"Remo",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | We consider the possibility that wormhole geometries are sustained by their own quantum fluctuations, in the context of noncommutative geometry and Gravity's Rainbow models. More specifically, the energy density of the graviton one-loop contribution to a classical energy in a wormhole background is considered as a self... |
gr-qc/9911075 | Robert van den Hoogen | A.A. Coley and R.J. van den Hoogen | The Dynamics of Multi-Scalar Field Cosmological Models and Assisted
Inflation | 27 pages, uses REVTeX Added an appendix illustrating some of the
details needed to compute the stability of the assisted inflationary solution | Phys.Rev. D62 (2000) 023517 | 10.1103/PhysRevD.62.023517 | null | gr-qc astro-ph | null | We investigate the dynamical properties of a class of spatially homogeneous
and isotropic cosmological models containing a barotropic perfect fluid and
multiple scalar fields with independent exponential potentials. We show that
the assisted inflationary scaling solution is the global late-time attractor
for the para... | [
{
"created": "Fri, 19 Nov 1999 18:22:39 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jan 2000 21:06:21 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Coley",
"A. A.",
""
],
[
"Hoogen",
"R. J. van den",
""
]
] | We investigate the dynamical properties of a class of spatially homogeneous and isotropic cosmological models containing a barotropic perfect fluid and multiple scalar fields with independent exponential potentials. We show that the assisted inflationary scaling solution is the global late-time attractor for the parame... |
2309.11280 | Felipe Agurto Sep\'ulveda | F. Agurto-Sepulveda, J. H Lagunas, J. Pedreros, B. Bandyopadhyay,
D.R.G Schleicher | Exploring how deviations from the Kerr metric can affect SMBH images | 3 pages, 2 figures,Accepted for publication in Bolet\'in de la
Asociaci\'on Argentina de Astronom\'ia | 2023BAAA...64..283A | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes (BH) are objects described by General Relativity (GR),
particularly by the Kerr solution. However, this solution is based on
simplifying assumptions. To achieve a more realistic approach, we investigate
the impact of deviations from the Kerr solution on the imaging of supermassive
black holes (SMBH). We c... | [
{
"created": "Wed, 20 Sep 2023 13:04:53 GMT",
"version": "v1"
}
] | 2023-09-22 | [
[
"Agurto-Sepulveda",
"F.",
""
],
[
"Lagunas",
"J. H",
""
],
[
"Pedreros",
"J.",
""
],
[
"Bandyopadhyay",
"B.",
""
],
[
"Schleicher",
"D. R. G",
""
]
] | Black holes (BH) are objects described by General Relativity (GR), particularly by the Kerr solution. However, this solution is based on simplifying assumptions. To achieve a more realistic approach, we investigate the impact of deviations from the Kerr solution on the imaging of supermassive black holes (SMBH). We con... |
gr-qc/0405130 | Bjorn Einarsson | Bjorn Einarsson | Conditions for negative specific heat in systems of attracting classical
particles | 11 pages, 1 figure, Published version (including correlation between
positive specific heat and singular points) | Phys.Lett. A332 (2004) 335-344 | 10.1016/j.physleta.2004.09.066 | null | gr-qc astro-ph cond-mat.stat-mech | null | We identify conditions for the presence of negative specific heat in
non-relativistic self-gravitating systems and similar systems of attracting
particles.
The method used, is to analyse the Virial theorem and two soluble models of
systems of attracting particles, and to map the sign of the specific heat for
differ... | [
{
"created": "Wed, 26 May 2004 10:26:15 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jun 2004 18:31:46 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Feb 2005 10:54:49 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Einarsson",
"Bjorn",
""
]
] | We identify conditions for the presence of negative specific heat in non-relativistic self-gravitating systems and similar systems of attracting particles. The method used, is to analyse the Virial theorem and two soluble models of systems of attracting particles, and to map the sign of the specific heat for different ... |
gr-qc/0201059 | Jose Geraldo Pereira | M. Calcada and J. G. Pereira | Gravitation and the Local Symmetry Group of Spacetime | 8 pages, no figures. Some signs and references corrected; version to
appear in Int. J. Theor. Phys | Int.J.Theor.Phys. 41 (2002) 729-736 | null | null | gr-qc | null | According to general relativity, the interaction of a matter field with
gravitation requires the simultaneous introduction of a tetrad field, which is
a field related to translations, and a spin connection, which is a field
assuming values in the Lie algebra of the Lorentz group. These two fields,
however, are not in... | [
{
"created": "Thu, 17 Jan 2002 17:09:37 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Feb 2002 13:15:01 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Calcada",
"M.",
""
],
[
"Pereira",
"J. G.",
""
]
] | According to general relativity, the interaction of a matter field with gravitation requires the simultaneous introduction of a tetrad field, which is a field related to translations, and a spin connection, which is a field assuming values in the Lie algebra of the Lorentz group. These two fields, however, are not inde... |
0908.3041 | Hiromi Saida | Hiromi Saida | de Sitter thermodynamics in the canonical ensemble | 28 pages, 2 figures, Accepted for publication in Prog.Theor.Phys,
Typos are corrected | Prog. Theor. Phys. 122 (2009), 1239-1266 | 10.1143/PTP.122.1239 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existing thermodynamics of the cosmological horizon in de-Sitter
spacetime is established in the micro-canonical ensemble, while thermodynamics
of black hole horizons are established in the canonical ensemble. Generally in
the ordinary thermodynamics and statistical mechanics, both of the
micro-canonical and cano... | [
{
"created": "Fri, 21 Aug 2009 02:27:47 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2009 02:59:41 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 2013 01:31:15 GMT",
"version": "v3"
}
] | 2013-11-05 | [
[
"Saida",
"Hiromi",
""
]
] | The existing thermodynamics of the cosmological horizon in de-Sitter spacetime is established in the micro-canonical ensemble, while thermodynamics of black hole horizons are established in the canonical ensemble. Generally in the ordinary thermodynamics and statistical mechanics, both of the micro-canonical and canoni... |
2006.08780 | Theodore Pailas | T. Pailas | "Time"-covariant Schr\"odinger equation and the canonical quantization
of the Reissner-Nordstr\"om black hole | 4 figures | null | 10.3390/quantum2030029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A "time"-covariant Schr\"{o}dinger equation is defined for the minisuperspace
model of the Reissner-Nordstr\"{o}m (RN) black hole, as a "hybrid" between the
"intrinsic time" Schr\"{o}dinger and Wheeler-DeWitt(WDW) equations. To do so, a
reduced, regular and "time(r)"-dependent Hamiltonian density was constructed,
wit... | [
{
"created": "Mon, 15 Jun 2020 21:31:42 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2020 23:17:10 GMT",
"version": "v2"
}
] | 2020-11-26 | [
[
"Pailas",
"T.",
""
]
] | A "time"-covariant Schr\"{o}dinger equation is defined for the minisuperspace model of the Reissner-Nordstr\"{o}m (RN) black hole, as a "hybrid" between the "intrinsic time" Schr\"{o}dinger and Wheeler-DeWitt(WDW) equations. To do so, a reduced, regular and "time(r)"-dependent Hamiltonian density was constructed, witho... |
gr-qc/0101103 | Christodoulakis Theodosios | T. Christodoulakis, G. Kofinas, G.O. Papadopoulos | Conditional Symmetries and Phase Space Reduction towards G.C.T.
Invariant Wave Functions, for the Class A Bianchi Type VI & VII Vacuum
Cosmologies | 12 pages, LaTeX2e, no figures | Phys.Lett.B514:149-154,2001 | 10.1016/S0370-2693(01)00793-6 | UA/NPPS-02-2001 | gr-qc | null | The quantization of Class A Bianchi Type VI and VII geometries -with all six
scale factors, as well as the lapse function and the shift vector present- is
considered. A first reduction of the initial 6-dimensional configuration space
is achieved by the usage of the information furnished by the quantum form of
the lin... | [
{
"created": "Fri, 26 Jan 2001 15:39:33 GMT",
"version": "v1"
},
{
"created": "Tue, 22 May 2001 10:57:40 GMT",
"version": "v2"
}
] | 2009-10-09 | [
[
"Christodoulakis",
"T.",
""
],
[
"Kofinas",
"G.",
""
],
[
"Papadopoulos",
"G. O.",
""
]
] | The quantization of Class A Bianchi Type VI and VII geometries -with all six scale factors, as well as the lapse function and the shift vector present- is considered. A first reduction of the initial 6-dimensional configuration space is achieved by the usage of the information furnished by the quantum form of the linea... |
0807.2652 | Nicolas Yunes | Victor Taveras and Nicolas Yunes | The Barbero-Immirzi Parameter as a Scalar Field: K-Inflation from Loop
Quantum Gravity? | Phys. Rev. D78, 064070 (2008) | Phys.Rev.D78:064070,2008 | 10.1103/PhysRevD.78.064070 | IGC-08/7-1 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a loop-quantum gravity inspired modification of general
relativity, where the Holst action is generalized by making the Barbero-Immirzi
(BI) parameter a scalar field, whose value could be dynamically determined. The
modified theory leads to a non-zero torsion tensor that corrects the field
equations throu... | [
{
"created": "Wed, 16 Jul 2008 20:17:33 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Nov 2008 20:11:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Taveras",
"Victor",
""
],
[
"Yunes",
"Nicolas",
""
]
] | We consider a loop-quantum gravity inspired modification of general relativity, where the Holst action is generalized by making the Barbero-Immirzi (BI) parameter a scalar field, whose value could be dynamically determined. The modified theory leads to a non-zero torsion tensor that corrects the field equations through... |
0812.3552 | Jian-Yang Zhu | Li-Fang Li and Jian-Yang Zhu | Tachyon field in loop quantum cosmology: An example of traversable
singularity | 7 pages, 3 figures. Accepted for publication in Physical Review D | Phys.Rev.D79:124011,2009 | 10.1103/PhysRevD.79.124011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop quantum cosmology (LQC) predicts a nonsingular evolution of the universe
through a bounce in the high energy region. But LQC has an ambiguity about the
quantization scheme. Recently, the authors in [Phys. Rev. D 77, 124008 (2008)]
proposed a new quantization scheme. Similar to others, this new quantization
schem... | [
{
"created": "Thu, 18 Dec 2008 15:26:27 GMT",
"version": "v1"
},
{
"created": "Sat, 23 May 2009 00:34:06 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Li",
"Li-Fang",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | Loop quantum cosmology (LQC) predicts a nonsingular evolution of the universe through a bounce in the high energy region. But LQC has an ambiguity about the quantization scheme. Recently, the authors in [Phys. Rev. D 77, 124008 (2008)] proposed a new quantization scheme. Similar to others, this new quantization scheme ... |
gr-qc/0511096 | Jorge Pullin | Rodolfo Gambini, Jorge Pullin | Consistent discretization and canonical classical and quantum Regge
calculus | 8 pages, Dedicated to Rafael Sorkin on his 60th birthday, to appear
in Proceedings of the Puri Conference, special issue of IJMPD | Int.J.Mod.Phys. D15 (2006) 1699-1706 | 10.1142/S0218271806009042 | LSU-REL-111605 | gr-qc hep-th | null | We apply the ``consistent discretization'' technique to the Regge action for
(Euclidean and Lorentzian) general relativity in arbitrary number of
dimensions. The result is a well defined canonical theory that is free of
constraints and where the dynamics is implemented as a canonical
transformation. This provides a f... | [
{
"created": "Wed, 16 Nov 2005 22:14:06 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jun 2006 17:31:43 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | We apply the ``consistent discretization'' technique to the Regge action for (Euclidean and Lorentzian) general relativity in arbitrary number of dimensions. The result is a well defined canonical theory that is free of constraints and where the dynamics is implemented as a canonical transformation. This provides a fra... |
2306.13782 | R Loll | R. Loll | Quantum Curvature as Key to the Quantum Universe | 38 pages, 17 figures, contribution to Handbook of Quantum Gravity
(eds. C. Bambi, L. Modesto and I.L. Shapiro, Springer Singapore, expected in
2023) | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Curvature is a key notion in General Relativity, characterizing the local
physical properties of spacetime. By contrast, the concept of curvature has
received scant attention in nonperturbative quantum gravity. One may even
wonder whether in a Planckian regime meaningful notions of (quantum) curvature
exist at all. R... | [
{
"created": "Fri, 23 Jun 2023 20:52:03 GMT",
"version": "v1"
}
] | 2023-06-27 | [
[
"Loll",
"R.",
""
]
] | Curvature is a key notion in General Relativity, characterizing the local physical properties of spacetime. By contrast, the concept of curvature has received scant attention in nonperturbative quantum gravity. One may even wonder whether in a Planckian regime meaningful notions of (quantum) curvature exist at all. Rem... |
1202.2677 | Alexander Zhuk | Alexey Chopovsky, Maxim Eingorn and Alexander Zhuk | Exact and asymptotic black branes with spherical compactification | 6 pages, no figures | Physical Review, D86 (2012) 024025 | 10.1103/PhysRevD.86.024025 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the six-dimensional Kaluza-Klein model with the multidimensional
cosmological constant $\Lambda_6$, we obtain the black brane with spherical
compactification of the internal space. The matter source for this exact
solution consists of two parts. First, it is a fine-tuned homogeneous perfect
fluid which provides sp... | [
{
"created": "Mon, 13 Feb 2012 09:53:52 GMT",
"version": "v1"
}
] | 2012-08-08 | [
[
"Chopovsky",
"Alexey",
""
],
[
"Eingorn",
"Maxim",
""
],
[
"Zhuk",
"Alexander",
""
]
] | In the six-dimensional Kaluza-Klein model with the multidimensional cosmological constant $\Lambda_6$, we obtain the black brane with spherical compactification of the internal space. The matter source for this exact solution consists of two parts. First, it is a fine-tuned homogeneous perfect fluid which provides sphe... |
2001.05968 | Olga Babourova Valer'evna | Olga V. Babourova, Boris N. Frolov | Harrison-Zel'dovich scale invariance and the exponential decrease of the
"cosmological constant" in the super-early Universe | 6 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological consequences of the Poincare-Weyl gauge theory of gravity are
considered. A generalized cosmological constant depending from the Dirac scalar
field is introduced. The stage of a super-early (Harrison-Zel'dovich) scale
invariant Universe is considered. It is shown that while the scale factor
sharply incre... | [
{
"created": "Thu, 16 Jan 2020 18:02:34 GMT",
"version": "v1"
}
] | 2020-01-17 | [
[
"Babourova",
"Olga V.",
""
],
[
"Frolov",
"Boris N.",
""
]
] | Cosmological consequences of the Poincare-Weyl gauge theory of gravity are considered. A generalized cosmological constant depending from the Dirac scalar field is introduced. The stage of a super-early (Harrison-Zel'dovich) scale invariant Universe is considered. It is shown that while the scale factor sharply increas... |
1102.4266 | Sergey Vyatchanin | Andrey Rakhubovsky, Stefan Hild and Sergey Vyatchanin | Stable double-resonance optical spring in laser gravitational-wave
detectors | 9 pafes, 8 figures | null | 10.1103/PhysRevD.84.062002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the optical spring characteristics of a double pumped Fabry-Perot
cavity. A double-resonance optical spring occurs when the optical spring
frequency and the detuning frequency of the cavity coincide. We formulate a
simple criterion for the stability of an optical spring and apply it to the
double resonance... | [
{
"created": "Mon, 21 Feb 2011 16:08:15 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Rakhubovsky",
"Andrey",
""
],
[
"Hild",
"Stefan",
""
],
[
"Vyatchanin",
"Sergey",
""
]
] | We analyze the optical spring characteristics of a double pumped Fabry-Perot cavity. A double-resonance optical spring occurs when the optical spring frequency and the detuning frequency of the cavity coincide. We formulate a simple criterion for the stability of an optical spring and apply it to the double resonance r... |
gr-qc/9907066 | Gilad Gour | Gilad Gour | Schwarzschild black hole as a grand canonical ensemble | RevTex, 10 pages, Accepted for publication in Physical Review D | Phys.Rev.D61:021501,2000 | 10.1103/PhysRevD.61.021501 | null | gr-qc hep-th quant-ph | null | For long black holes have been considered as endowed with a definite
temperature. Yet when the Schwarzschild black hole is treated as a canonical
ensemble three problems arise: incompatibility with the Hawking radiation,
divergence of the partition function, and a formally negative mean-square
fluctuation of the ener... | [
{
"created": "Wed, 21 Jul 1999 07:38:33 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Oct 1999 09:36:39 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Gour",
"Gilad",
""
]
] | For long black holes have been considered as endowed with a definite temperature. Yet when the Schwarzschild black hole is treated as a canonical ensemble three problems arise: incompatibility with the Hawking radiation, divergence of the partition function, and a formally negative mean-square fluctuation of the energy... |
1901.05592 | Carolina Benone | Carolina L. Benone and Lu\'is C. B. Crispino | Massive and charged scalar field in Kerr-Newman spacetime: Absorption
and superradiance | 8 pages, 7 figures | null | 10.1103/PhysRevD.99.044009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the propagation of a generic scalar field around a rotating and
charged black hole. Using the partial wave method, we find, numerically, the
total and partial absorption cross sections for different incidence angles. We
investigate the low- and high-frequency limits, finding semi-analytical
approximations... | [
{
"created": "Thu, 17 Jan 2019 02:35:14 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Benone",
"Carolina L.",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | We consider the propagation of a generic scalar field around a rotating and charged black hole. Using the partial wave method, we find, numerically, the total and partial absorption cross sections for different incidence angles. We investigate the low- and high-frequency limits, finding semi-analytical approximations f... |
1305.1723 | Semyon Dyatlov | Semyon Dyatlov | Asymptotics of linear waves and resonances with applications to black
holes | 45 pages, 4 figures | null | 10.1007/s00220-014-2255-y | null | gr-qc math.AP math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the results of arXiv:1301.5633 to describe asymptotic behavior of
linear waves on stationary Lorentzian metrics with r-normally hyperbolic
trapped sets, in particular Kerr and Kerr-de Sitter metrics with |a|<M and
M\Lambda a << 1. We prove that if the initial data is localized at frequencies
\lambda >> 1, th... | [
{
"created": "Wed, 8 May 2013 06:17:39 GMT",
"version": "v1"
}
] | 2015-02-02 | [
[
"Dyatlov",
"Semyon",
""
]
] | We apply the results of arXiv:1301.5633 to describe asymptotic behavior of linear waves on stationary Lorentzian metrics with r-normally hyperbolic trapped sets, in particular Kerr and Kerr-de Sitter metrics with |a|<M and M\Lambda a << 1. We prove that if the initial data is localized at frequencies \lambda >> 1, then... |
1012.3083 | Thomas Buchert | Thomas Buchert, Nathaniel Obadia and Xavier Roy | Effective Inhomogeneous Cosmologies and Emerging Scalar Fields | 4 pages, 4 figures, contribution to the Workshop: New Directions in
Modern Cosmology, Leiden, The Netherlands, 27.9.-1.10. (2010) | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution we summarize two recent applications of a correspondence
between backreaction terms in averaged inhomogeneous cosmologies and an
effective scalar field (the `morphon'). Backreaction terms that add to the
standard sources of Friedmannian kinematical laws and that emerge from
geometrical curvature ... | [
{
"created": "Tue, 14 Dec 2010 16:26:59 GMT",
"version": "v1"
}
] | 2010-12-15 | [
[
"Buchert",
"Thomas",
""
],
[
"Obadia",
"Nathaniel",
""
],
[
"Roy",
"Xavier",
""
]
] | In this contribution we summarize two recent applications of a correspondence between backreaction terms in averaged inhomogeneous cosmologies and an effective scalar field (the `morphon'). Backreaction terms that add to the standard sources of Friedmannian kinematical laws and that emerge from geometrical curvature in... |
gr-qc/0107021 | Alessandra Buonanno | Alessandra Buonanno and Yanbei Chen | Signal recycled laser-interferometer gravitational-wave detectors as
optical springs | 42 pages, 13 figures | Phys.Rev. D65 (2002) 042001 | 10.1103/PhysRevD.65.042001 | GRP/00/555 | gr-qc | null | Using the force-susceptibility formalism of linear quantum measurements, we
study the dynamics of signal recycled interferometers, such as LIGO-II. We show
that, although the antisymmetric mode of motion of the four arm-cavity mirrors
is originally described by a free mass, when the signal-recycling mirror is
added t... | [
{
"created": "Thu, 5 Jul 2001 19:15:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Buonanno",
"Alessandra",
""
],
[
"Chen",
"Yanbei",
""
]
] | Using the force-susceptibility formalism of linear quantum measurements, we study the dynamics of signal recycled interferometers, such as LIGO-II. We show that, although the antisymmetric mode of motion of the four arm-cavity mirrors is originally described by a free mass, when the signal-recycling mirror is added to ... |
2108.09051 | Minyong Guo | Haopeng Yan, Zezhou Hu, Minyong Guo and Bin Chen | Photon emissions from near-horizon extremal and near-extremal Kerr
equatorial emitters | Slight change in title, matched the published version in PRD | null | 10.1103/PhysRevD.104.124005 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We consider isotropic and monochromatic photon emissions from equatorial
emitters moving along future-directed timelike geodesics in the near-horizon
extremal Kerr (NHEK) and near-horizon near-extremal Kerr (near-NHEK) regions,
to asymptotic infinity. We obtain numerical results for the photon escaping
probability (P... | [
{
"created": "Fri, 20 Aug 2021 08:27:45 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Dec 2021 08:43:10 GMT",
"version": "v2"
}
] | 2021-12-07 | [
[
"Yan",
"Haopeng",
""
],
[
"Hu",
"Zezhou",
""
],
[
"Guo",
"Minyong",
""
],
[
"Chen",
"Bin",
""
]
] | We consider isotropic and monochromatic photon emissions from equatorial emitters moving along future-directed timelike geodesics in the near-horizon extremal Kerr (NHEK) and near-horizon near-extremal Kerr (near-NHEK) regions, to asymptotic infinity. We obtain numerical results for the photon escaping probability (PEP... |
gr-qc/9307033 | Centro De Estudios Cientificos De Santia | Maximo Banados, Claudio Teitelboim and Jorge Zanelli | Dimensionally Continued Black Holes | RevTex (3.0), 33 pages | Phys.Rev. D49 (1994) 975-986 | 10.1103/PhysRevD.49.975 | null | gr-qc | null | Static, spherically symmetric solutions of the field equations for a
particular dimensional continuation of general relativity with negative
cosmological constant are studied. The action is, in odd dimensions, the
Chern-Simons form for the anti-de Sitter group and, in even dimensions, the
Euler density constructed wi... | [
{
"created": "Fri, 23 Jul 1993 02:22:50 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 1993 02:57:32 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Banados",
"Maximo",
""
],
[
"Teitelboim",
"Claudio",
""
],
[
"Zanelli",
"Jorge",
""
]
] | Static, spherically symmetric solutions of the field equations for a particular dimensional continuation of general relativity with negative cosmological constant are studied. The action is, in odd dimensions, the Chern-Simons form for the anti-de Sitter group and, in even dimensions, the Euler density constructed with... |
gr-qc/9806097 | Robert M. Wald | Robert M. Wald | Gravitational Lensing in Inhomogeneous Universes | 9 pages, latex 2e. To appear in proceedings of XLIXth Yamada
Conference on Black Holes and High Energy Astrophysics | null | null | null | gr-qc | null | I describe a new approach (developed in collaboration with D.E. Holz) to
calculating the statistical distributions for magnification, shear, and
rotation of images of cosmological sources due to gravitational lensing by mass
inhomogeneities on galactic and smaller scales. Our approach is somewhat
similar to that used... | [
{
"created": "Wed, 24 Jun 1998 23:35:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wald",
"Robert M.",
""
]
] | I describe a new approach (developed in collaboration with D.E. Holz) to calculating the statistical distributions for magnification, shear, and rotation of images of cosmological sources due to gravitational lensing by mass inhomogeneities on galactic and smaller scales. Our approach is somewhat similar to that used i... |
2210.17379 | Konstantin Osetrin | Konstantin Osetrin and Altair Filippov and Ilya Kirnos and Evgeny
Osetrin | Type I Shapovalov wave spacetimes in the Brans-Dicke scalar-tensor
theory of gravity | 12 pages | Symmetry, 2022, 14(12), 2636 | 10.3390/sym14122636 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Exact solutions for Shapovalov wave spacetimes of type I in the scalar-tensor
theory of gravity of Brans-Dicke are constructed. Shapovalov's wave spacetimes
describe gravitational-wave models that allow the separation of wave variables
in privileged coordinate systems. In contrast to the general theory of
relativity,... | [
{
"created": "Mon, 31 Oct 2022 15:04:23 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2022 05:16:57 GMT",
"version": "v2"
}
] | 2022-12-20 | [
[
"Osetrin",
"Konstantin",
""
],
[
"Filippov",
"Altair",
""
],
[
"Kirnos",
"Ilya",
""
],
[
"Osetrin",
"Evgeny",
""
]
] | Exact solutions for Shapovalov wave spacetimes of type I in the scalar-tensor theory of gravity of Brans-Dicke are constructed. Shapovalov's wave spacetimes describe gravitational-wave models that allow the separation of wave variables in privileged coordinate systems. In contrast to the general theory of relativity, t... |
2208.07752 | Jan Sbierski | Jan Sbierski | Uniqueness and non-uniqueness results for spacetime extensions | 36 pages | null | null | null | gr-qc math-ph math.CA math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a function $f : A \to \mathbb{R}^n$ of a certain regularity defined on
some open subset $A \subseteq \mathbb{R}^m$, it is a classical problem of
analysis to investigate whether the function can be extended to all of
$\mathbb{R}^m$ in a certain regularity class. If an extension exists and is
continuous, then cer... | [
{
"created": "Tue, 16 Aug 2022 13:49:34 GMT",
"version": "v1"
}
] | 2022-08-17 | [
[
"Sbierski",
"Jan",
""
]
] | Given a function $f : A \to \mathbb{R}^n$ of a certain regularity defined on some open subset $A \subseteq \mathbb{R}^m$, it is a classical problem of analysis to investigate whether the function can be extended to all of $\mathbb{R}^m$ in a certain regularity class. If an extension exists and is continuous, then certa... |
1102.1452 | Stefano Finazzi | Stefano Finazzi and Renaud Parentani | On the robustness of acoustic black hole spectra | 4 pages, 2 figure, jpconf.cls; to appear in the proceedings of the
Spanish Relativity Meeting ERE2010 | J.Phys.Conf.Ser.314:012030,2011 | 10.1088/1742-6596/314/1/012030 | null | gr-qc cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the robustness of the spectrum emitted by an acoustic black hole by
considering series of stationary flows that become either subsonic or
supersonic, i.e. when the horizon disappears. We work with the superluminal
Bogoliubov dispersion of Bose--Einstein condensates. We find that the spectrum
remains remarkab... | [
{
"created": "Mon, 7 Feb 2011 22:03:19 GMT",
"version": "v1"
}
] | 2015-03-18 | [
[
"Finazzi",
"Stefano",
""
],
[
"Parentani",
"Renaud",
""
]
] | We study the robustness of the spectrum emitted by an acoustic black hole by considering series of stationary flows that become either subsonic or supersonic, i.e. when the horizon disappears. We work with the superluminal Bogoliubov dispersion of Bose--Einstein condensates. We find that the spectrum remains remarkably... |
gr-qc/0506123 | Allemandi Gianluca | Gianluca Allemandi, Mauro Francaviglia, Matteo Luca Ruggiero, Angelo
Tartaglia | Post-Newtonian Parameters from Alternative Theories of Gravity | 17 pages, no figures | Gen.Rel.Grav.37:1891-1904,2005 | 10.1007/s10714-005-0195-8 | null | gr-qc | null | Alternative theories of gravity have been recently studied in connection with
their cosmological applications, both in the Palatini and in the metric
formalism. The aim of this paper is to propose a theoretical framework (in the
Palatini formalism) to test these theories at the solar system level and
possibly at the ... | [
{
"created": "Mon, 27 Jun 2005 07:52:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Allemandi",
"Gianluca",
""
],
[
"Francaviglia",
"Mauro",
""
],
[
"Ruggiero",
"Matteo Luca",
""
],
[
"Tartaglia",
"Angelo",
""
]
] | Alternative theories of gravity have been recently studied in connection with their cosmological applications, both in the Palatini and in the metric formalism. The aim of this paper is to propose a theoretical framework (in the Palatini formalism) to test these theories at the solar system level and possibly at the ga... |
gr-qc/0012109 | Vladimir Kassandrov | Vladimir V. Kassandrov, Joseph A. Rizcallah | Twistor and "weak" gauge structures in the framework of quaternionic
analysis | 20 pages, 2 figures | null | null | null | gr-qc hep-th math-ph math.MP | null | The earlier proposed conditions of (bi)quaternionic differentiability are
nonlinear, give rize to the 2-spinor and the self-dual gauge structures and may
be considered as the it generating system of equations (GSE) with respect to
the source-free Maxwell, Yang-Mills and eikonal equations. We present the
general solut... | [
{
"created": "Fri, 29 Dec 2000 15:35:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kassandrov",
"Vladimir V.",
""
],
[
"Rizcallah",
"Joseph A.",
""
]
] | The earlier proposed conditions of (bi)quaternionic differentiability are nonlinear, give rize to the 2-spinor and the self-dual gauge structures and may be considered as the it generating system of equations (GSE) with respect to the source-free Maxwell, Yang-Mills and eikonal equations. We present the general solutio... |
1409.4117 | Edward Anderson | Edward Anderson | Problem of Time and Background Independence: the Individual Facets | 40 pages including 13 Figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I lay out the problem of time facets as arising piecemeal from a number of
aspects of background independence. Almost all of these already have simpler
classical counterparts. This approach can be viewed as a facet by facet
completion of the observation that Barbour-type relationalism is a background
independent prec... | [
{
"created": "Sun, 14 Sep 2014 23:23:05 GMT",
"version": "v1"
}
] | 2014-09-16 | [
[
"Anderson",
"Edward",
""
]
] | I lay out the problem of time facets as arising piecemeal from a number of aspects of background independence. Almost all of these already have simpler classical counterparts. This approach can be viewed as a facet by facet completion of the observation that Barbour-type relationalism is a background independent precur... |
gr-qc/0210006 | Dumitru Vulcanov | D.N. Vulcanov (Max-Planck-Institut fur Gravitationsphysik,
Albert-Einstein-Institut, Golm, Germany) | Doing numerical cosmology with the Cactus code | 18 pages, 8 figures, Latex | null | null | null | gr-qc astro-ph physics.comp-ph | null | The article presents some aspects concerning the construction of a new thorn
for the Cactus code, a complete 3-dimensional machinery for numerical
relativity. This thorn is completely dedicated to numerical simulations in
cosmology, that means it can provide evolutions of different cosmological
models, mainly based o... | [
{
"created": "Wed, 2 Oct 2002 14:42:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vulcanov",
"D. N.",
"",
"Max-Planck-Institut fur Gravitationsphysik,\n Albert-Einstein-Institut, Golm, Germany"
]
] | The article presents some aspects concerning the construction of a new thorn for the Cactus code, a complete 3-dimensional machinery for numerical relativity. This thorn is completely dedicated to numerical simulations in cosmology, that means it can provide evolutions of different cosmological models, mainly based on ... |
1405.2611 | Yen-Kheng Lim | Yen-Kheng Lim | Geodesic motion in the vacuum C-metric | 24 pages, 10 figures | Phys. Rev. D 89, 104016 (2014) | 10.1103/PhysRevD.89.104016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geodesic equations of the vacuum C-metric are derived and solved for various
cases. The solutions describe the motion of timelike or null particles with
conserved energy and angular momentum. Polar, nearly-circular orbits around
weakly accelerated black holes may be regarded as a perturbation of circular
Schwarzschil... | [
{
"created": "Mon, 12 May 2014 01:41:59 GMT",
"version": "v1"
}
] | 2014-05-13 | [
[
"Lim",
"Yen-Kheng",
""
]
] | Geodesic equations of the vacuum C-metric are derived and solved for various cases. The solutions describe the motion of timelike or null particles with conserved energy and angular momentum. Polar, nearly-circular orbits around weakly accelerated black holes may be regarded as a perturbation of circular Schwarzschild ... |
1010.1664 | Kentaro Tanabe | Kentaro Tanabe, Norihiro Tanahashi, Tetsuya Shiromizu | Angular momentum at null infinity in five dimensions | 15 pages, published version in JMP | J.Math.Phys.52:032501,2011 | 10.1063/1.3559917 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, using the Bondi coordinates, we discuss the angular momentum
at null infinity in five dimensions and address the Poincare covariance of the
Bondi mass and angular momentum. We also show the angular momentum loss/gain
law due to gravitational waves. In four dimensions, the angular momentum at
null infin... | [
{
"created": "Fri, 8 Oct 2010 11:31:07 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Mar 2011 14:45:24 GMT",
"version": "v2"
}
] | 2011-03-08 | [
[
"Tanabe",
"Kentaro",
""
],
[
"Tanahashi",
"Norihiro",
""
],
[
"Shiromizu",
"Tetsuya",
""
]
] | In this paper, using the Bondi coordinates, we discuss the angular momentum at null infinity in five dimensions and address the Poincare covariance of the Bondi mass and angular momentum. We also show the angular momentum loss/gain law due to gravitational waves. In four dimensions, the angular momentum at null infinit... |
gr-qc/0405139 | Ettore Minguzzi | E. Minguzzi | A globally well-behaved simultaneity connection for stationary frames in
the weak field limit | 19 pages, Revtex4. Some misprints removed. Final version | Class.Quant.Grav. 21 (2004) 4123-4146 | 10.1088/0264-9381/21/17/007 | null | gr-qc | null | Local simultaneity conventions are mathematically represented by connections
on the bundle of timelike curves that defines the frame. Those simultaneity
conventions having an holonomy proportional to the Riemann tensor have a
special interest since they exhibit a good global behavior in the weak field
limit. By requi... | [
{
"created": "Fri, 28 May 2004 15:47:07 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Aug 2004 14:15:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Minguzzi",
"E.",
""
]
] | Local simultaneity conventions are mathematically represented by connections on the bundle of timelike curves that defines the frame. Those simultaneity conventions having an holonomy proportional to the Riemann tensor have a special interest since they exhibit a good global behavior in the weak field limit. By requiri... |
1003.0476 | Barry Wardell | Barry Wardell and Adrian C. Ottewill | A Transport Equation Approach to Green Functions and Self-force
Calculations | 3 pages, 1 figure; to appear in the proceedings of the 12th Marcel
Grossmann meeting on general relativity | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent work, we presented the first application of the
Poisson-Wiseman-Anderson method of `matched expansions' to compute the
self-force acting on a point particle moving in a curved spacetime. The method
employs two expansions for the Green function which are respectively valid in
the `quasilocal' and `distant ... | [
{
"created": "Mon, 1 Mar 2010 23:06:09 GMT",
"version": "v1"
}
] | 2010-03-03 | [
[
"Wardell",
"Barry",
""
],
[
"Ottewill",
"Adrian C.",
""
]
] | In a recent work, we presented the first application of the Poisson-Wiseman-Anderson method of `matched expansions' to compute the self-force acting on a point particle moving in a curved spacetime. The method employs two expansions for the Green function which are respectively valid in the `quasilocal' and `distant pa... |
2203.03449 | Connor McIsaac | Connor McIsaac, Ian Harry | Using machine learning to auto-tune chi-squared tests for gravitational
wave searches | 10 pages, 5 figures. Supplementary data:
https://icg-gravwaves.github.io/chisqnet/ . Version accepted for publication
in PRD. Various updates made during review process. Typos corrected | Phys. Rev. D 105, 104056 (2022) | 10.1103/PhysRevD.105.104056 | LIGO-P2100244 | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | The sensitivity of gravitational wave searches is reduced by the presence of
non-Gaussian noise in the detector data. These non-Gaussianities often match
well with the template waveforms used in matched filter searches, and require
signal-consistency tests to distinguish them from astrophysical signals.
However, empi... | [
{
"created": "Mon, 7 Mar 2022 15:07:54 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2022 14:30:30 GMT",
"version": "v2"
}
] | 2022-05-26 | [
[
"McIsaac",
"Connor",
""
],
[
"Harry",
"Ian",
""
]
] | The sensitivity of gravitational wave searches is reduced by the presence of non-Gaussian noise in the detector data. These non-Gaussianities often match well with the template waveforms used in matched filter searches, and require signal-consistency tests to distinguish them from astrophysical signals. However, empiri... |
1304.2240 | Mubasher Jamil | Mubasher Jamil, Farook Rahaman, Ratbay Myrzakulov, P.K.F. Kuhfittig,
Nasr Ahmed and Umar F Mondal | Nonommutative wormholes in $f(R)$ gravity | 9 pages, 17 figures, Accepted for publication in the Journal of
Korean Physical Society (Proceedings of 13th Italian-Korean Symposium on
Relativistic Astrophysics) | Journal of the Korean Physical Society Vol. 65 (2014) pp 917-925 | 10.3938/jkps.65.917 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper discusses several new exact solutions of static wormholes in
$f(R)$ gravity with a noncommutative-geometry background, which replaces
point-like structures by smeared objects. In the first part of the paper we
assume the power-law form $f(R)=aR^n$ and discuss several solutions
corresponding to different va... | [
{
"created": "Sat, 23 Mar 2013 09:09:18 GMT",
"version": "v1"
},
{
"created": "Thu, 8 May 2014 16:19:47 GMT",
"version": "v2"
}
] | 2014-10-21 | [
[
"Jamil",
"Mubasher",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Myrzakulov",
"Ratbay",
""
],
[
"Kuhfittig",
"P. K. F.",
""
],
[
"Ahmed",
"Nasr",
""
],
[
"Mondal",
"Umar F",
""
]
] | This paper discusses several new exact solutions of static wormholes in $f(R)$ gravity with a noncommutative-geometry background, which replaces point-like structures by smeared objects. In the first part of the paper we assume the power-law form $f(R)=aR^n$ and discuss several solutions corresponding to different valu... |
gr-qc/0304073 | Shijun Yoshida | Shijun Yoshida, Umin Lee | r-modes in Relativistic Superfluid Stars | 14 pages, 4 figures. To appear in Physical Review D | Phys.Rev. D67 (2003) 124019 | 10.1103/PhysRevD.67.124019 | null | gr-qc astro-ph | null | We discuss the modal properties of the $r$-modes of relativistic superfluid
neutron stars, taking account of the entrainment effects between superfluids.
In this paper, the neutron stars are assumed to be filled with neutron and
proton superfluids and the strength of the entrainment effects between the
superfluids ar... | [
{
"created": "Mon, 21 Apr 2003 15:55:47 GMT",
"version": "v1"
},
{
"created": "Mon, 5 May 2003 14:04:42 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Yoshida",
"Shijun",
""
],
[
"Lee",
"Umin",
""
]
] | We discuss the modal properties of the $r$-modes of relativistic superfluid neutron stars, taking account of the entrainment effects between superfluids. In this paper, the neutron stars are assumed to be filled with neutron and proton superfluids and the strength of the entrainment effects between the superfluids are ... |
1802.04665 | Mohammad Reza Setare | M. R. Setare and H. Adami | Near Horizon Symmetry and Entropy Formula for Kerr-Newman (A)dS Black
Holes | 16 pages. Version published in JHEP | JHEP 04 (2018) 133 | 10.1007/JHEP04(2018)133 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we provide the first non-trivial evidence for universality of
the entropy formula $4\pi J_{0}^{+}J_{0}^{-}$ beyond pure Einstein gravity in
4-dimensions. We consider the Einstein-Maxwell theory in the presence of
cosmological constant, then write near horizon metric of the Kerr-Newman (A)dS
black hole i... | [
{
"created": "Mon, 12 Feb 2018 05:29:24 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2018 06:53:28 GMT",
"version": "v2"
}
] | 2018-05-23 | [
[
"Setare",
"M. R.",
""
],
[
"Adami",
"H.",
""
]
] | In this paper we provide the first non-trivial evidence for universality of the entropy formula $4\pi J_{0}^{+}J_{0}^{-}$ beyond pure Einstein gravity in 4-dimensions. We consider the Einstein-Maxwell theory in the presence of cosmological constant, then write near horizon metric of the Kerr-Newman (A)dS black hole in ... |
1003.1847 | Richard Dowdall Mr | Richard J. Dowdall, Winston J. Fairbairn | Observables in 3d spinfoam quantum gravity with fermions | 32 pages, many diagrams, uses psfrag. | null | 10.1007/s10714-010-1107-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study expectation values of observables in three-dimensional spinfoam
quantum gravity coupled to Dirac fermions. We revisit the model introduced by
one of the authors and extend it to the case of massless fermionic fields. We
introduce observables, analyse their symmetries and the corresponding proper
gauge fixing... | [
{
"created": "Tue, 9 Mar 2010 11:18:21 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Dowdall",
"Richard J.",
""
],
[
"Fairbairn",
"Winston J.",
""
]
] | We study expectation values of observables in three-dimensional spinfoam quantum gravity coupled to Dirac fermions. We revisit the model introduced by one of the authors and extend it to the case of massless fermionic fields. We introduce observables, analyse their symmetries and the corresponding proper gauge fixing. ... |
gr-qc/0611107 | Thomas Sotiriou | Thomas P. Sotiriou | Curvature scalar instability in f(R) gravity | typos corrected, replaced to match published version | Phys.Lett.B645:389-392,2007 | 10.1016/j.physletb.2007.01.003 | null | gr-qc astro-ph hep-th | null | An instability in the presence of matter in theories of gravity which include
a 1/R correction in the gravitational action has been found by Dolgov and
Kawasaki. In the present paper this instability is discussed for f(R) gravity
in general. We focus on the Palatini formalism of the theory and it is shown
that no suc... | [
{
"created": "Mon, 20 Nov 2006 15:07:05 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2007 19:18:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sotiriou",
"Thomas P.",
""
]
] | An instability in the presence of matter in theories of gravity which include a 1/R correction in the gravitational action has been found by Dolgov and Kawasaki. In the present paper this instability is discussed for f(R) gravity in general. We focus on the Palatini formalism of the theory and it is shown that no such ... |
1611.04618 | Miftachul Hadi | Miftachul Hadi, Malcolm Anderson, Andri Husein | The Gravitational Field Equations of a Twisted Skyrmion String:
Numerical Solution | 8 pages, 5 figures, submitted to ICSAS 2016 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study nonlinear sigma model, especially Skyrme model with twist: twisted
Skyrmion string where twist term, $mkz$, is indicated in vortex solution. To
add gravity, we replace $\eta^{\mu\nu}$ in Lagrangian system with a space-time
metric tensor, $g^{\mu\nu}$, which in view of the time-independence and
cylindrical sy... | [
{
"created": "Wed, 9 Nov 2016 02:38:18 GMT",
"version": "v1"
}
] | 2016-11-16 | [
[
"Hadi",
"Miftachul",
""
],
[
"Anderson",
"Malcolm",
""
],
[
"Husein",
"Andri",
""
]
] | We study nonlinear sigma model, especially Skyrme model with twist: twisted Skyrmion string where twist term, $mkz$, is indicated in vortex solution. To add gravity, we replace $\eta^{\mu\nu}$ in Lagrangian system with a space-time metric tensor, $g^{\mu\nu}$, which in view of the time-independence and cylindrical symm... |
1510.04745 | Hongwei Yu | Huabing Cai, Hongwei Yu, Wenting Zhou | Spontaneous excitation of a static atom in a thermal bath in cosmic
string spacetime | 20 pages, 4 figures, to appear in PRD | Phys. Rev. D92, 084062(2015) | 10.1103/PhysRevD.92.084062 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the average rate of change of energy for a static atom immersed in a
thermal bath of electromagnetic radiation in the cosmic string spacetime and
separately calculate the contributions of thermal fluctuations and radiation
reaction. We find that the transition rates are crucially dependent on the
atom-string... | [
{
"created": "Thu, 15 Oct 2015 23:31:59 GMT",
"version": "v1"
}
] | 2017-02-02 | [
[
"Cai",
"Huabing",
""
],
[
"Yu",
"Hongwei",
""
],
[
"Zhou",
"Wenting",
""
]
] | We study the average rate of change of energy for a static atom immersed in a thermal bath of electromagnetic radiation in the cosmic string spacetime and separately calculate the contributions of thermal fluctuations and radiation reaction. We find that the transition rates are crucially dependent on the atom-string d... |
gr-qc/9512019 | Mihail Tentyukov | M.N.Tentyukov (Joint Institute for Nuclear Research,Dubna) | Spherically symmetric solutions of gravitation equations on the
background with spatial sections of constant curvature | 16 pages, LaTeX file, no macros required, 11 figures in separate
Postscript file | null | null | null | gr-qc | null | We investigate the vacuum and charged spherically symmetric static solutions
of the Einstein equations on cosmological background. The background metric is
not flat, but curved, with constant - curvature spatial sections. Both vacuum
and charged cases contain two branches. The first branches transform into the
Schwar... | [
{
"created": "Sat, 9 Dec 1995 20:51:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tentyukov",
"M. N.",
"",
"Joint Institute for Nuclear Research,Dubna"
]
] | We investigate the vacuum and charged spherically symmetric static solutions of the Einstein equations on cosmological background. The background metric is not flat, but curved, with constant - curvature spatial sections. Both vacuum and charged cases contain two branches. The first branches transform into the Schwarzs... |
1804.05485 | Tomohiro Nakamura | Tomohiro Nakamura, Taishi Ikeda, Ryo Saito and Chul-Moon Yoo | Chameleon Field in a Spherical Shell System | 20 pages, 10 figures | Phys. Rev. D 99, 044024 (2019) | 10.1103/PhysRevD.99.044024 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the validity of screening mechanism of the fifth force for
chameleon field in highly inhomogeneous density profile. For simplicity, we
consider a static and spherically symmetric system which is composed of
concentric infinitely thin shells. We calculate the fifth force profile by
using a numerical met... | [
{
"created": "Mon, 16 Apr 2018 02:53:06 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Oct 2018 13:43:24 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Nakamura",
"Tomohiro",
""
],
[
"Ikeda",
"Taishi",
""
],
[
"Saito",
"Ryo",
""
],
[
"Yoo",
"Chul-Moon",
""
]
] | We investigate the validity of screening mechanism of the fifth force for chameleon field in highly inhomogeneous density profile. For simplicity, we consider a static and spherically symmetric system which is composed of concentric infinitely thin shells. We calculate the fifth force profile by using a numerical metho... |
1802.10396 | Ingemar Bengtsson | Ingemar Bengtsson and Irina Galstyan | Black Hole Lattices Under the Microscope | 17 pages, 6 figures | Class. Quantum Grav. 35 (2018) 145004 | 10.1088/1361-6382/aac7e0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known how to choose initial data for Einstein's equations describing an
arbitrary number of black holes at a moment of time symmetry. This idea has
been used to give insight into the cosmological averaging problem. We study the
local curvature of the initial data space, for configurations of 8, 120, or 600
blac... | [
{
"created": "Wed, 28 Feb 2018 13:16:07 GMT",
"version": "v1"
}
] | 2018-07-11 | [
[
"Bengtsson",
"Ingemar",
""
],
[
"Galstyan",
"Irina",
""
]
] | It is known how to choose initial data for Einstein's equations describing an arbitrary number of black holes at a moment of time symmetry. This idea has been used to give insight into the cosmological averaging problem. We study the local curvature of the initial data space, for configurations of 8, 120, or 600 black ... |
1408.1448 | Changlong Wang | C. L. Wang, R. P. Woodard | Excitation of Photons by Inflationary Gravitons | Version 2 revised for publication in Physical Review D contains
substantial discussion of the eventual breakdown of perturbation implied by
our result | Phys. Rev. D 91, 124054 (2015) | 10.1103/PhysRevD.91.124054 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a recent result for the graviton contribution to the one loop vacuum
polarization to solve the effective field equations for dynamical photons on de
Sitter background. Our results show that the electric field experiences a
secular enhancement proportional to the number of inflationary e-foldings. We
discuss th... | [
{
"created": "Thu, 7 Aug 2014 00:52:12 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jun 2015 14:11:10 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Wang",
"C. L.",
""
],
[
"Woodard",
"R. P.",
""
]
] | We use a recent result for the graviton contribution to the one loop vacuum polarization to solve the effective field equations for dynamical photons on de Sitter background. Our results show that the electric field experiences a secular enhancement proportional to the number of inflationary e-foldings. We discuss the ... |
1711.02685 | Joshua Cooperman | Joshua H. Cooperman | Scaling analyses of the spectral dimension in 3-dimensional causal
dynamical triangulations | 16+3 pages, 19 figures | null | 10.1088/1361-6382/aab86e | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spectral dimension measures the dimensionality of a space as witnessed by
a diffusing random walker. Within the causal dynamical triangulations approach
to the quantization of gravity, the spectral dimension exhibits novel
scale-dependent dynamics: reducing towards a value near 2 on sufficiently small
scales, mat... | [
{
"created": "Tue, 7 Nov 2017 19:01:34 GMT",
"version": "v1"
}
] | 2018-05-02 | [
[
"Cooperman",
"Joshua H.",
""
]
] | The spectral dimension measures the dimensionality of a space as witnessed by a diffusing random walker. Within the causal dynamical triangulations approach to the quantization of gravity, the spectral dimension exhibits novel scale-dependent dynamics: reducing towards a value near 2 on sufficiently small scales, match... |
2205.06953 | Yoshimasa Kurihara | Yoshimasa Kurihara | Topological indices of general relativity and Yang-Mills theory in
four-dimensional space-time | 65 pages, 7 figures | null | null | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | This report investigates general relativity and the Yang-Mills theory in
four-dimensional space-time using a common mathematical framework, the
Chern--Weil theory for principal bundles. The whole theory is described owing
to the fibre bundle with the $GL(4)$ symmetry by twisting several principal
bundles with the gau... | [
{
"created": "Sat, 14 May 2022 02:38:45 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2022 00:51:27 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Nov 2022 07:00:06 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Aug 2023 09:37:52 GMT",
"version": "v4"
}
] | 2023-08-14 | [
[
"Kurihara",
"Yoshimasa",
""
]
] | This report investigates general relativity and the Yang-Mills theory in four-dimensional space-time using a common mathematical framework, the Chern--Weil theory for principal bundles. The whole theory is described owing to the fibre bundle with the $GL(4)$ symmetry by twisting several principal bundles with the gauge... |
gr-qc/9709001 | Nese Ozdemir | M.Hortacsu and N. Ozdemir | An Extension of Multiple Cosmic String Solution | latex,no figure | Mod.Phys.Lett. A13 (1998) 3081-3090 | 10.1142/S0217732398003284 | null | gr-qc | null | We extend the work done for cosmic strings on the perturbative calculation of
vacuum polarization of a massless field in the space-time of multiple cosmic
strings and show that for a more general class of locally flat metrics the one
loop calculation do not introduce any new divergences to the VEV of the energy
of a ... | [
{
"created": "Mon, 1 Sep 1997 09:29:06 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Hortacsu",
"M.",
""
],
[
"Ozdemir",
"N.",
""
]
] | We extend the work done for cosmic strings on the perturbative calculation of vacuum polarization of a massless field in the space-time of multiple cosmic strings and show that for a more general class of locally flat metrics the one loop calculation do not introduce any new divergences to the VEV of the energy of a sc... |
gr-qc/0303013 | Massimo Tinto | Massimo Tinto, Daniel A. Shaddock, Julien Sylvestre, J.W. Armstrong | Implementation of Time-Delay Interferometry for LISA | 39 pages, 6 figures, 2 tables | Phys.Rev. D67 (2003) 122003 | 10.1103/PhysRevD.67.122003 | null | gr-qc | null | We discuss the baseline optical configuration for the Laser Interferometer
Space Antenna (LISA) mission, in which the lasers are not free-running, but
rather one of them is used as the main frequency reference generator (the {\it
master}) and the remaining five as {\it slaves}, these being phase-locked to
the master ... | [
{
"created": "Mon, 3 Mar 2003 19:33:35 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Tinto",
"Massimo",
""
],
[
"Shaddock",
"Daniel A.",
""
],
[
"Sylvestre",
"Julien",
""
],
[
"Armstrong",
"J. W.",
""
]
] | We discuss the baseline optical configuration for the Laser Interferometer Space Antenna (LISA) mission, in which the lasers are not free-running, but rather one of them is used as the main frequency reference generator (the {\it master}) and the remaining five as {\it slaves}, these being phase-locked to the master (t... |
2303.17969 | Hiroshi Kozaki | Hiroshi Kozaki, Tatsuhiko Koike, Yoshiyuki Morisawa and Hideki
Ishihara | Nambu-Goto Strings with a null symmetry and contact structure | 33 pages, 4 figures, version accepted for publication | null | null | OCU-PHYS-577, AP-GR-188, NITEP-154 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical dynamics of the Nambu-Goto strings with a null
symmetry in curved spacetimes admitting a null Killing vector field. The
Nambu-Goto equation is reduced to first order ordinary differential equations
and is always integrable in contrast to the case of non-null symmetries where
integrability requi... | [
{
"created": "Fri, 31 Mar 2023 11:13:43 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Sep 2023 04:03:43 GMT",
"version": "v2"
}
] | 2023-10-02 | [
[
"Kozaki",
"Hiroshi",
""
],
[
"Koike",
"Tatsuhiko",
""
],
[
"Morisawa",
"Yoshiyuki",
""
],
[
"Ishihara",
"Hideki",
""
]
] | We study the classical dynamics of the Nambu-Goto strings with a null symmetry in curved spacetimes admitting a null Killing vector field. The Nambu-Goto equation is reduced to first order ordinary differential equations and is always integrable in contrast to the case of non-null symmetries where integrability require... |
1511.03644 | Atousa Chaharsough Shirazi | Atousa Chaharsough Shirazi, Jonathan Engle and Ilya Vilensky | Hessian and graviton propagator of the proper vertex | 20 pages | null | 10.1088/0264-9381/33/20/205010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The proper spin-foam vertex amplitude is obtained from the EPRL vertex by
projecting out all but a single gravitational sector, in order to achieve
correct semi-classical behavior. In this paper we calculate the gravitational
two-point function predicted by the proper spin-foam vertex to lowest order in
the vertex ex... | [
{
"created": "Wed, 11 Nov 2015 20:29:18 GMT",
"version": "v1"
}
] | 2016-10-19 | [
[
"Shirazi",
"Atousa Chaharsough",
""
],
[
"Engle",
"Jonathan",
""
],
[
"Vilensky",
"Ilya",
""
]
] | The proper spin-foam vertex amplitude is obtained from the EPRL vertex by projecting out all but a single gravitational sector, in order to achieve correct semi-classical behavior. In this paper we calculate the gravitational two-point function predicted by the proper spin-foam vertex to lowest order in the vertex expa... |
1411.3997 | Ulrich Sperhake | Ulrich Sperhake | The numerical relativity breakthrough for binary black holes | 34 pages, 5 figures; Invited article for Classical and Quantum
Gravity's "Milestones of General Relativity" series; to match published
version | null | 10.1088/0264-9381/32/12/124011 | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of black-hole binaries in vacuum spacetimes constitutes the
two-body problem in general relativity. The solution of this problem in the
framework of the Einstein field equations is a substantially more complex
exercise than that of the dynamics of two point masses in Newtonian gravity,
but it also prese... | [
{
"created": "Fri, 14 Nov 2014 18:13:45 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Sperhake",
"Ulrich",
""
]
] | The evolution of black-hole binaries in vacuum spacetimes constitutes the two-body problem in general relativity. The solution of this problem in the framework of the Einstein field equations is a substantially more complex exercise than that of the dynamics of two point masses in Newtonian gravity, but it also present... |
2005.13644 | Gustav Holzegel | Gustav Holzegel, Christopher Kauffman | A note on the wave equation on black hole spacetimes with small
non-decaying first order terms | 7 pages | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an elementary physical space argument to establish local
integrated decay estimates for the perturbed wave equation $\Box_g \phi =
\epsilon \beta^a \partial_a \phi$ on the exterior of the Schwarzschild geometry
$(\mathcal{M},g)$. Here $\beta$ is a regular vectorfield on $\mathcal{M}$
decaying suitably in s... | [
{
"created": "Wed, 27 May 2020 20:50:06 GMT",
"version": "v1"
}
] | 2020-05-29 | [
[
"Holzegel",
"Gustav",
""
],
[
"Kauffman",
"Christopher",
""
]
] | We present an elementary physical space argument to establish local integrated decay estimates for the perturbed wave equation $\Box_g \phi = \epsilon \beta^a \partial_a \phi$ on the exterior of the Schwarzschild geometry $(\mathcal{M},g)$. Here $\beta$ is a regular vectorfield on $\mathcal{M}$ decaying suitably in spa... |
1805.04470 | Jiliang Jing | Xiaobao Liu, Zehua Tian, Jieci Wang, Jiliang Jing | Radiative process of two entanglement atoms in de Sitter spacetime | 9 pages, 4 figures. Accepted by PRD for publication. arXiv admin
note: text overlap with arXiv:1512.02886 by other authors | Phys. Rev. D 97, (2018) 105030 | 10.1103/PhysRevD.97.105030 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the radiative processes of a quantum system composed by two
identical two-level atoms in the de Sitter spacetime, interacting with a
conformally coupled massless scalar field prepared in the de Sitter-invariant
vacuum. We discuss the structure of the rate of variations of the atomic energy
for two stat... | [
{
"created": "Thu, 10 May 2018 00:49:51 GMT",
"version": "v1"
}
] | 2018-06-05 | [
[
"Liu",
"Xiaobao",
""
],
[
"Tian",
"Zehua",
""
],
[
"Wang",
"Jieci",
""
],
[
"Jing",
"Jiliang",
""
]
] | We investigate the radiative processes of a quantum system composed by two identical two-level atoms in the de Sitter spacetime, interacting with a conformally coupled massless scalar field prepared in the de Sitter-invariant vacuum. We discuss the structure of the rate of variations of the atomic energy for two static... |
2301.13685 | Joris van Heijningen | Joris van Heijningen, Marcel ter Brake, Oliver Gerberding, Shreevathsa
Chalathadka Subrahmanya, Jan Harms, Xing Bian, Alberto Gatti, Morgane Zeoli,
Alessandro Bertolini, Christophe Collette, Andrea Perali, Nicola Pinto,
Meenakshi Sharma, Filip Tavernier and Javad Rezvani | The payload of the Lunar Gravitational-wave Antenna | null | null | 10.1063/5.0144687 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The toolbox to study the Universe grew on 14 September 2015 when the
LIGO-Virgo collaboration heard a signal from two colliding black holes between
30-250 Hz. Since then, many more gravitational waves have been detected as
detectors increased sensitivity. However, the current detector design
sensitivity curves still ... | [
{
"created": "Tue, 31 Jan 2023 15:03:00 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2023 10:52:52 GMT",
"version": "v2"
}
] | 2023-07-05 | [
[
"van Heijningen",
"Joris",
""
],
[
"ter Brake",
"Marcel",
""
],
[
"Gerberding",
"Oliver",
""
],
[
"Subrahmanya",
"Shreevathsa Chalathadka",
""
],
[
"Harms",
"Jan",
""
],
[
"Bian",
"Xing",
""
],
[
"Gatti",
"Albe... | The toolbox to study the Universe grew on 14 September 2015 when the LIGO-Virgo collaboration heard a signal from two colliding black holes between 30-250 Hz. Since then, many more gravitational waves have been detected as detectors increased sensitivity. However, the current detector design sensitivity curves still ha... |
1102.3553 | Jackson Levi Said | Jackson Levi Said, Kristian Zarb Adami | The Generalized Uncertainty Principle in f(R) Gravity for a Charged
Black Hole | 10 pages, 3 figures, Physical Review D (Accepted) | Phys.Rev.D83:043008,2011 | 10.1103/PhysRevD.83.043008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using f (R) gravity in the Palatini formularism, the metric for a charged
spherically symmetric black hole is derived, taking the Ricci scalar curvature
to be constant. The generalized uncertainty principle is then used to calculate
the temperature of the resulting black hole, through this the entropy is found
correc... | [
{
"created": "Thu, 17 Feb 2011 10:29:36 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Mar 2011 13:53:54 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Said",
"Jackson Levi",
""
],
[
"Adami",
"Kristian Zarb",
""
]
] | Using f (R) gravity in the Palatini formularism, the metric for a charged spherically symmetric black hole is derived, taking the Ricci scalar curvature to be constant. The generalized uncertainty principle is then used to calculate the temperature of the resulting black hole, through this the entropy is found correcti... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.