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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1707.09521 | Muhammed Amir | Muhammed Amir, Balendra Pratap Singh, Sushant G. Ghosh | Shadows of rotating five-dimensional charged EMCS black holes | 27 pages, 9 figures, matches with published version | Eur. Phys. J. C (2018) 78: 399 | 10.1140/epjc/s10052-018-5872-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher dimensional theories admit astrophysical objects like supermassive
black holes, which are rather different from standard ones, and their
gravitational lensing features deviate from general relativity. It is well
known that a black hole shadow is a dark region due to the falling geodesics of
photons into the bl... | [
{
"created": "Sat, 29 Jul 2017 14:45:17 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2017 03:40:36 GMT",
"version": "v2"
},
{
"created": "Wed, 30 May 2018 12:49:01 GMT",
"version": "v3"
}
] | 2018-05-31 | [
[
"Amir",
"Muhammed",
""
],
[
"Singh",
"Balendra Pratap",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | Higher dimensional theories admit astrophysical objects like supermassive black holes, which are rather different from standard ones, and their gravitational lensing features deviate from general relativity. It is well known that a black hole shadow is a dark region due to the falling geodesics of photons into the blac... |
0812.0783 | Mauricio Bellini | Jesus Martin Romero (Mar del Plata University), Mauricio Bellini (Mar
del Plata University & CONICET) | The seed of magnetic monopoles in the early inflationary universe from a
5D vacuum state | Version accepted in Physics Letters B | Phys.Lett.B674:143-145,2009 | 10.1016/j.physletb.2009.03.026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from a 5D Riemann flat metric, we have induced an effective 4D
Hermitian metric which has an antisymmetric part which is purely imaginary. We
have worked an example in which both, non-metricity and contorsion are zero. We
obtained that the production of monopoles should be insignificant at the end of
inflati... | [
{
"created": "Wed, 3 Dec 2008 19:06:53 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2009 18:03:32 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Mar 2009 14:10:12 GMT",
"version": "v3"
}
] | 2009-04-06 | [
[
"Romero",
"Jesus Martin",
"",
"Mar del Plata University"
],
[
"Bellini",
"Mauricio",
"",
"Mar\n del Plata University & CONICET"
]
] | Starting from a 5D Riemann flat metric, we have induced an effective 4D Hermitian metric which has an antisymmetric part which is purely imaginary. We have worked an example in which both, non-metricity and contorsion are zero. We obtained that the production of monopoles should be insignificant at the end of inflation... |
gr-qc/9505012 | Jacob D. Bekenstein | Jacob D. Bekenstein and V. F. Mukhanov | Spectroscopy of the quantum black hole | RevTeX, 9 pages | Phys.Lett. B360 (1995) 7-12 | 10.1016/0370-2693(95)01148-J | null | gr-qc hep-th quant-ph | null | We develop the idea that, in quantum gravity where the horizon fluctuates, a
black hole should have a discrete mass spectrum with concomitant line emission.
Simple arguments fix the spacing of the lines, which should be broad but
unblended. Assuming uniformity of the matrix elements for quantum transitions
between ne... | [
{
"created": "Wed, 10 May 1995 18:40:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bekenstein",
"Jacob D.",
""
],
[
"Mukhanov",
"V. F.",
""
]
] | We develop the idea that, in quantum gravity where the horizon fluctuates, a black hole should have a discrete mass spectrum with concomitant line emission. Simple arguments fix the spacing of the lines, which should be broad but unblended. Assuming uniformity of the matrix elements for quantum transitions between near... |
gr-qc/0005112 | Abel Camacho Quintana | Abel Camacho (Astrophysikalisches Institut Potsdam) | Quantum-Mechanical Detection of Non-Newtonian Gravity | 17 pages, accepted in International Journal of Modern Physics A | Int.J.Mod.Phys.A16:83-96,2001 | 10.1142/S0217751X01002105 | null | gr-qc quant-ph | null | In this work the possibility of detecting the presence of a Yukawa term, as
an additional contribution to the usual Newtonian gravitational potential, is
introduced. The central idea is to analyze the effects at quantum level
employing interference patterns (at this respect the present proposal resembles
the Colella,... | [
{
"created": "Thu, 25 May 2000 02:11:37 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Camacho",
"Abel",
"",
"Astrophysikalisches Institut Potsdam"
]
] | In this work the possibility of detecting the presence of a Yukawa term, as an additional contribution to the usual Newtonian gravitational potential, is introduced. The central idea is to analyze the effects at quantum level employing interference patterns (at this respect the present proposal resembles the Colella, O... |
2311.15742 | Andrew Mummery | Andrew Mummery, Steven Balbus, Adam Ingram | Testing theories of accretion and gravity with super-extremal Kerr discs | 16 pages + appendices, 16 figures. Accepted MNRAS version. superkerr
XSPEC model available at: https://github.com/andymummeryastro/superkerr | null | 10.1093/mnras/stad3532 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Fitting the thermal continuum emission of accreting black holes observed
across X-ray bands represents one of the principle means of constraining the
properties (mass and spin) of astrophysical black holes. Recent ''continuum
fitting'' studies of Galactic X-ray binaries in the soft state have found best
fitting dimen... | [
{
"created": "Mon, 27 Nov 2023 11:56:48 GMT",
"version": "v1"
}
] | 2023-11-28 | [
[
"Mummery",
"Andrew",
""
],
[
"Balbus",
"Steven",
""
],
[
"Ingram",
"Adam",
""
]
] | Fitting the thermal continuum emission of accreting black holes observed across X-ray bands represents one of the principle means of constraining the properties (mass and spin) of astrophysical black holes. Recent ''continuum fitting'' studies of Galactic X-ray binaries in the soft state have found best fitting dimensi... |
gr-qc/9710114 | Steve Carlip | S. Carlip | Dominant Topologies in Euclidean Quantum Gravity | 14 pages, LaTeX. Minor additions (computability, relation to
``minimal volume'' in topology); error in eqn (3.5) corrected; references
added. To appear in Class. Quant. Grav | Class.Quant.Grav.15:2629-2638,1998 | 10.1088/0264-9381/15/9/010 | UCD-97-21 | gr-qc hep-th | null | The dominant topologies in the Euclidean path integral for quantum gravity
differ sharply according on the sign of the cosmological constant. For
$\Lambda>0$, saddle points can occur only for topologies with vanishing first
Betti number and finite fundamental group. For $\Lambda<0$, on the other hand,
the path integr... | [
{
"created": "Mon, 27 Oct 1997 17:31:47 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 1998 19:43:38 GMT",
"version": "v2"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
]
] | The dominant topologies in the Euclidean path integral for quantum gravity differ sharply according on the sign of the cosmological constant. For $\Lambda>0$, saddle points can occur only for topologies with vanishing first Betti number and finite fundamental group. For $\Lambda<0$, on the other hand, the path integral... |
1611.03393 | \"Ozg\"ur Akarsu | Muzaffer Adak, Ozgur Akarsu, Tekin Dereli, Ozcan Sert | Anisotropic inflation with a non-minimally coupled electromagnetic field
to gravity | 28 pages, 12 figures; improved considerably; matches the version
published in JCAP | JCAP 11 (2017) 026 | 10.1088/1475-7516/2017/11/026 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the non-minimal model of gravity in $Y(R) F^2$-form. We
investigate a particular case of the model, for which the higher order
derivatives are eliminated but the scalar curvature $R$ is kept to be dynamical
via the constraint $Y_RF_{mn}F^{mn} =-\frac{2}{\kappa^2}$. The effective fluid
obtained can be repr... | [
{
"created": "Thu, 10 Nov 2016 16:48:05 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Nov 2016 14:44:27 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Jun 2017 12:15:04 GMT",
"version": "v3"
},
{
"created": "Thu, 16 Nov 2017 16:24:10 GMT",
"version": "v4"
}
] | 2017-11-17 | [
[
"Adak",
"Muzaffer",
""
],
[
"Akarsu",
"Ozgur",
""
],
[
"Dereli",
"Tekin",
""
],
[
"Sert",
"Ozcan",
""
]
] | We consider the non-minimal model of gravity in $Y(R) F^2$-form. We investigate a particular case of the model, for which the higher order derivatives are eliminated but the scalar curvature $R$ is kept to be dynamical via the constraint $Y_RF_{mn}F^{mn} =-\frac{2}{\kappa^2}$. The effective fluid obtained can be repres... |
0909.4944 | Nijo Varghese Mr. | Nijo Varghese and V C Kuriakose | Stability of black holes in Horava gravity: Gravitational quasinormal
modes | 9 pages, reference added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational perturbations in the geometry of asymptotically flat black hole
solution in the deformed Ho\v{r}ava-Lifshitz(HL) gravity are considered and the
associated quasinormal mode(QNM) frequencies are evaluated using WKB method.
Black holes are found to be stable against small perturbations. We also find a
sign... | [
{
"created": "Sun, 27 Sep 2009 15:52:10 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2009 05:45:36 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Dec 2009 14:39:26 GMT",
"version": "v3"
}
] | 2009-12-17 | [
[
"Varghese",
"Nijo",
""
],
[
"Kuriakose",
"V C",
""
]
] | Gravitational perturbations in the geometry of asymptotically flat black hole solution in the deformed Ho\v{r}ava-Lifshitz(HL) gravity are considered and the associated quasinormal mode(QNM) frequencies are evaluated using WKB method. Black holes are found to be stable against small perturbations. We also find a signif... |
gr-qc/9711077 | Motomu Tsuda | Motomu Tsuda and Takeshi Shirafuji | Minimal Off-Shell Version of N = 1 Chiral Supergravity | 9 pages, latex | Phys.Rev. D58 (1998) 087702 | 10.1103/PhysRevD.58.087702 | STUPP-97-152 | gr-qc | null | We construct the minimal off-shell formulation of N = 1 chiral supergravity
(SUGRA) introducing a complex antisymmetric tensor field $B_{\mu \nu}$ and a
complex axial-vector field $A_{\mu}$ as auxiliary fields. The resulting algebra
of the right- and left-handed supersymmetry (SUSY) transformations closes off
shell a... | [
{
"created": "Wed, 26 Nov 1997 07:58:11 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Tsuda",
"Motomu",
""
],
[
"Shirafuji",
"Takeshi",
""
]
] | We construct the minimal off-shell formulation of N = 1 chiral supergravity (SUGRA) introducing a complex antisymmetric tensor field $B_{\mu \nu}$ and a complex axial-vector field $A_{\mu}$ as auxiliary fields. The resulting algebra of the right- and left-handed supersymmetry (SUSY) transformations closes off shell and... |
gr-qc/0208067 | Chao-Guang Huang | Han-Ying Guo, Chao-Guang Huang and Xiaoning Wu | Noether-Charge Realization of Diffeomorphism Algebra | null | Phys.Rev.D67:024031,2003 | 10.1103/PhysRevD.67.024031 | null | gr-qc | null | It is shown in the covariant phase space formalism that the Noether charges
with respect to the diffeomorphism generated by vector fields and their
horizontal variations in general relativity form a diffeomorphism algebra. It
is also shown with the help of the null tetrad which is well defined everywhere
that the cen... | [
{
"created": "Fri, 23 Aug 2002 04:37:06 GMT",
"version": "v1"
}
] | 2009-02-24 | [
[
"Guo",
"Han-Ying",
""
],
[
"Huang",
"Chao-Guang",
""
],
[
"Wu",
"Xiaoning",
""
]
] | It is shown in the covariant phase space formalism that the Noether charges with respect to the diffeomorphism generated by vector fields and their horizontal variations in general relativity form a diffeomorphism algebra. It is also shown with the help of the null tetrad which is well defined everywhere that the centr... |
1908.03191 | Andrea Geralico | Donato Bini, Andrea Geralico | Gauge-fixing for the completion problem of reconstructed metric
perturbations of a Kerr spacetime | 13 pages, revtex macros; improved version: new section added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a prescription to solve the metric completion problem in
gravitational self-force calculations on a Kerr spacetime by fixing the
remaining gauge freedom. We discuss the explicit example of eccentric
equatorial orbits, recovering all limiting cases already studied in the
literature of eccentric orbits in Sc... | [
{
"created": "Thu, 8 Aug 2019 17:51:21 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 2020 10:23:35 GMT",
"version": "v2"
}
] | 2020-05-05 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | We provide a prescription to solve the metric completion problem in gravitational self-force calculations on a Kerr spacetime by fixing the remaining gauge freedom. We discuss the explicit example of eccentric equatorial orbits, recovering all limiting cases already studied in the literature of eccentric orbits in Schw... |
gr-qc/0512111 | Eric Poisson | Javier Molina Sanchez and Eric Poisson | Extended-body approach to the electromagnetic self-force in curved
spacetime | 13 pages; revised version | null | null | null | gr-qc | null | We offer a novel derivation of the electromagnetic self-force acting on a
charged particle moving in an arbitrary curved spacetime. Our derivation is
based on a generalization from flat spacetime to curved spacetime of the
extended-body approach of Ori and Rosenthal. In this approach the charged
particle is first mod... | [
{
"created": "Tue, 20 Dec 2005 16:28:47 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jan 2007 19:42:50 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sanchez",
"Javier Molina",
""
],
[
"Poisson",
"Eric",
""
]
] | We offer a novel derivation of the electromagnetic self-force acting on a charged particle moving in an arbitrary curved spacetime. Our derivation is based on a generalization from flat spacetime to curved spacetime of the extended-body approach of Ori and Rosenthal. In this approach the charged particle is first model... |
gr-qc/0701050 | Ying-Qiu Gu | Ying-Qiu Gu, M. Yu. Khlopov | How to Measure the Cosmic Curvature | 10 pages, 2 figures | null | null | null | gr-qc astro-ph | null | The conventional method to determine the cosmic curvature is to measure the
total mass density $\Omega_{\rm tot}$. Unfortunately the observational
$\Omega_{\rm tot}$ is closely near the critical value 1. The computation of
this paper shows that $\Omega_{\rm tot}\approx 1$ is an inevitable result for
the young univers... | [
{
"created": "Tue, 9 Jan 2007 01:32:14 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Feb 2008 06:50:25 GMT",
"version": "v2"
}
] | 2008-02-17 | [
[
"Gu",
"Ying-Qiu",
""
],
[
"Khlopov",
"M. Yu.",
""
]
] | The conventional method to determine the cosmic curvature is to measure the total mass density $\Omega_{\rm tot}$. Unfortunately the observational $\Omega_{\rm tot}$ is closely near the critical value 1. The computation of this paper shows that $\Omega_{\rm tot}\approx 1$ is an inevitable result for the young universe ... |
2107.06160 | Vyacheslav Dokuchaev | Victor A. Berezin, Vyacheslav I. Dokuchaev, Yury N. Eroshenko and
Alexey L. Smirnov | On the cosmological solutions in Weyl geometry | 12 pages, published version | JCAP11(2021)053 | 10.1088/1475-7516/2021/11/053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated the possibility of construction the homogeneous and isotropic
cosmological solutions in Weyl geometry. We derived the self-consistency
condition which ensures the conformal invariance of the complete set of
equations of motion. There is the special gauge in choosing the conformal
factor when the Weyl ... | [
{
"created": "Tue, 13 Jul 2021 15:17:01 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2021 17:43:34 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Nov 2021 17:53:50 GMT",
"version": "v3"
}
] | 2021-12-01 | [
[
"Berezin",
"Victor A.",
""
],
[
"Dokuchaev",
"Vyacheslav I.",
""
],
[
"Eroshenko",
"Yury N.",
""
],
[
"Smirnov",
"Alexey L.",
""
]
] | We investigated the possibility of construction the homogeneous and isotropic cosmological solutions in Weyl geometry. We derived the self-consistency condition which ensures the conformal invariance of the complete set of equations of motion. There is the special gauge in choosing the conformal factor when the Weyl ve... |
2403.01726 | Gang Wang | Gang Wang | SATDI: Simulation and Analysis for Time-Delay Interferometry | 17 pages, 10 figures | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time-delay interferometry (TDI) is essential for space-based gravitational
wave (GW) missions to effectively suppress laser frequency noise and achieve
targeting sensitivity. The principle of the TDI is to synthesize multiple laser
link measurements between spacecraft and create virtual equal-arm
interferometry. This... | [
{
"created": "Mon, 4 Mar 2024 04:36:31 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Wang",
"Gang",
""
]
] | Time-delay interferometry (TDI) is essential for space-based gravitational wave (GW) missions to effectively suppress laser frequency noise and achieve targeting sensitivity. The principle of the TDI is to synthesize multiple laser link measurements between spacecraft and create virtual equal-arm interferometry. This p... |
1106.4370 | Subenoy Chakraborty | Ritabrata Biswas, Nairwita Mazumder, Subenoy Chakraborty | Hawking-like radiation from the apparent horizon in an FRW Universe :
Quantum Corrections | an error has been found | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study Hawking-like radiation in a FRW-Universe using
semi-classical tunnelling approach and the Hamilton-Jacobi method. Radial null
geodesics are used to picture the process as a "tunnelling" of particles from
behind the apparent horizon and Hawking -like temperature has been calculated.
Quantum corr... | [
{
"created": "Wed, 22 Jun 2011 05:14:19 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2012 17:25:10 GMT",
"version": "v2"
}
] | 2012-10-01 | [
[
"Biswas",
"Ritabrata",
""
],
[
"Mazumder",
"Nairwita",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this paper we study Hawking-like radiation in a FRW-Universe using semi-classical tunnelling approach and the Hamilton-Jacobi method. Radial null geodesics are used to picture the process as a "tunnelling" of particles from behind the apparent horizon and Hawking -like temperature has been calculated. Quantum correc... |
2008.09186 | Abhishek Goswami | Abhishek Goswami | Embedding Cosmology and Gravity | Published version | Eur. Phys. J. C 81, 151 (2021) | 10.1140/epjc/s10052-021-08963-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I start with a scenario where the universe is an abstract space $\mathcal{M}$
having $d$ dimensions. There is a two dimensional surface embedded in it.
Embedding is a map from the embedded surface to $\mathcal{M}$ that has a field
theory described by Sigma model. I take $d$ directions of $\mathcal{M}$ to be
the gener... | [
{
"created": "Thu, 20 Aug 2020 20:07:18 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2020 00:50:59 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Sep 2020 12:24:35 GMT",
"version": "v3"
},
{
"created": "Thu, 17 Dec 2020 15:01:48 GMT",
"version": "v4"
},
{
"cr... | 2021-08-17 | [
[
"Goswami",
"Abhishek",
""
]
] | I start with a scenario where the universe is an abstract space $\mathcal{M}$ having $d$ dimensions. There is a two dimensional surface embedded in it. Embedding is a map from the embedded surface to $\mathcal{M}$ that has a field theory described by Sigma model. I take $d$ directions of $\mathcal{M}$ to be the generat... |
gr-qc/9912030 | Jeffrey Winicour | Bela Szilagyi, Roberto Gomez, Nigel T. Bishop, Jeffrey Winicour | Cauchy boundaries in linearized gravitational theory | 23 pages including 3 figures and 2 tables, revtex | Phys.Rev. D62 (2000) 104006 | 10.1103/PhysRevD.62.104006 | null | gr-qc | null | We investigate the numerical stability of Cauchy evolution of linearized
gravitational theory in a 3-dimensional bounded domain. Criteria of robust
stability are proposed, developed into a testbed and used to study various
evolution-boundary algorithms. We construct a standard explicit finite
difference code which so... | [
{
"created": "Wed, 8 Dec 1999 15:18:05 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Dec 2000 23:35:19 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Szilagyi",
"Bela",
""
],
[
"Gomez",
"Roberto",
""
],
[
"Bishop",
"Nigel T.",
""
],
[
"Winicour",
"Jeffrey",
""
]
] | We investigate the numerical stability of Cauchy evolution of linearized gravitational theory in a 3-dimensional bounded domain. Criteria of robust stability are proposed, developed into a testbed and used to study various evolution-boundary algorithms. We construct a standard explicit finite difference code which solv... |
gr-qc/0108073 | Roy Maartens | John D Barrow (Cambridge), Roy Maartens (Portsmouth) | Kaluza-Klein anisotropy in the CMB | 4 pages revtex; minor changes to improve clarity | Phys.Lett. B532 (2002) 153-158 | 10.1016/S0370-2693(02)01552-6 | null | gr-qc astro-ph hep-th | null | We show that 5-dimensional Kaluza-Klein graviton stresses can slow the decay
of shear anisotropy on the brane to observable levels, and we use cosmic
microwave background anisotropies to place limits on the initial anisotropy
induced by these stresses. An initial shear to Hubble distortion of only \sim
10^{-3}\Omega_... | [
{
"created": "Wed, 29 Aug 2001 09:01:03 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jan 2002 17:15:59 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Barrow",
"John D",
"",
"Cambridge"
],
[
"Maartens",
"Roy",
"",
"Portsmouth"
]
] | We show that 5-dimensional Kaluza-Klein graviton stresses can slow the decay of shear anisotropy on the brane to observable levels, and we use cosmic microwave background anisotropies to place limits on the initial anisotropy induced by these stresses. An initial shear to Hubble distortion of only \sim 10^{-3}\Omega_0h... |
2002.02907 | Guglielmo M. Tino | G. M. Tino, L. Cacciapuoti, S. Capozziello, G. Lambiase, F. Sorrentino | Precision Gravity Tests and the Einstein Equivalence Principle | null | Published in Progress in Particle and Nuclear Physics 112, 103772
(2020) | 10.1016/j.ppnp.2020.103772 | null | gr-qc physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity is today the best theory of gravity addressing a wide
range of phenomena. Our understanding of physical laws, from cosmology to local
scales, cannot be properly formulated without taking into account it. It is
based on one of the most fundamental principles of Nature, the Equivalence
Principle, whi... | [
{
"created": "Fri, 7 Feb 2020 17:05:45 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Apr 2020 17:21:07 GMT",
"version": "v2"
}
] | 2020-06-16 | [
[
"Tino",
"G. M.",
""
],
[
"Cacciapuoti",
"L.",
""
],
[
"Capozziello",
"S.",
""
],
[
"Lambiase",
"G.",
""
],
[
"Sorrentino",
"F.",
""
]
] | General Relativity is today the best theory of gravity addressing a wide range of phenomena. Our understanding of physical laws, from cosmology to local scales, cannot be properly formulated without taking into account it. It is based on one of the most fundamental principles of Nature, the Equivalence Principle, which... |
2407.03395 | Yasaman Yazdi | Heidar Moradi, Yasaman K. Yazdi, Miguel Zilh\~ao | Fluctuations and Correlations in Causal Set Theory | 34 pages | null | null | DIAS-STP-24-15 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the statistical fluctuations (such as the variance) of causal set
quantities, with particular focus on the causal set action. To facilitate
calculating such fluctuations, we develop tools to account for correlations
between causal intervals with different cardinalities. We present a convenient
decomposition ... | [
{
"created": "Wed, 3 Jul 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"Moradi",
"Heidar",
""
],
[
"Yazdi",
"Yasaman K.",
""
],
[
"Zilhão",
"Miguel",
""
]
] | We study the statistical fluctuations (such as the variance) of causal set quantities, with particular focus on the causal set action. To facilitate calculating such fluctuations, we develop tools to account for correlations between causal intervals with different cardinalities. We present a convenient decomposition of... |
1710.06268 | Pierre-Henri Chavanis | Pierre-Henri Chavanis | Phase transitions between dilute and dense axion stars | null | Phys. Rev. D 98, 023009 (2018) | 10.1103/PhysRevD.98.023009 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nature of phase transitions between dilute and dense axion stars
interpreted as self-gravitating Bose-Einstein condensates. We develop a
Newtonian model based on the Gross-Pitaevskii-Poisson equations for a complex
scalar field with a self-interaction potential $V(|\psi|^2)$ involving an
attractive $|\ps... | [
{
"created": "Tue, 10 Oct 2017 17:28:15 GMT",
"version": "v1"
}
] | 2018-07-18 | [
[
"Chavanis",
"Pierre-Henri",
""
]
] | We study the nature of phase transitions between dilute and dense axion stars interpreted as self-gravitating Bose-Einstein condensates. We develop a Newtonian model based on the Gross-Pitaevskii-Poisson equations for a complex scalar field with a self-interaction potential $V(|\psi|^2)$ involving an attractive $|\psi|... |
0812.2545 | Kamal Nandi | K. K. Nandi, A.I. Filippov, F. Rahaman, Saibal Ray, A. A. Usmani, M.
Kalam, and A. DeBenedictis | Features of galactic halo in a brane world model and observational
constraints | 17 pages. Accepted for publication in Monthly Notices of the Royal
Society; Figures available at
http://www.sfu.ca/~adebened/research/brane_gal_rot_curves/ | Mon.Not.Roy.Astron.Soc.399:2079-2087,2009 | 10.1111/j.1365-2966.2009.15399.x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several aspects of the 4d imprint of the 5d bulk Weyl radiation are
investigated within a recently proposed model solution. It is shown that the
solution has a number of physically interesting properties. The constraints on
the model imposed by combined measurements of rotation curve and lensing are
discussed. A brie... | [
{
"created": "Sat, 13 Dec 2008 12:59:11 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Dec 2008 09:48:54 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Dec 2008 10:07:34 GMT",
"version": "v3"
},
{
"created": "Sat, 20 Dec 2008 09:48:35 GMT",
"version": "v4"
},
{
"c... | 2011-07-08 | [
[
"Nandi",
"K. K.",
""
],
[
"Filippov",
"A. I.",
""
],
[
"Rahaman",
"F.",
""
],
[
"Ray",
"Saibal",
""
],
[
"Usmani",
"A. A.",
""
],
[
"Kalam",
"M.",
""
],
[
"DeBenedictis",
"A.",
""
]
] | Several aspects of the 4d imprint of the 5d bulk Weyl radiation are investigated within a recently proposed model solution. It is shown that the solution has a number of physically interesting properties. The constraints on the model imposed by combined measurements of rotation curve and lensing are discussed. A brief ... |
1108.3174 | Linqing Wen | Jing Luan (Caltech), Shaun Hooper (UWA), Linqing Wen (UWA) and Yanbei
Chen (Caltech) | Towards low-latency real-time detection of gravitational waves from
compact binary coalescences in the era of advanced detectors | 19 pages, 6 figures, for PRD | null | 10.1103/PhysRevD.85.102002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electromagnetic (EM) follow-up observations of gravitational wave (GW) events
will help shed light on the nature of the sources, and more can be learned if
the EM follow-ups can start as soon as the GW event becomes observable. In this
paper, we propose a computationally efficient time-domain algorithm capable of
det... | [
{
"created": "Tue, 16 Aug 2011 08:05:30 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Luan",
"Jing",
"",
"Caltech"
],
[
"Hooper",
"Shaun",
"",
"UWA"
],
[
"Wen",
"Linqing",
"",
"UWA"
],
[
"Chen",
"Yanbei",
"",
"Caltech"
]
] | Electromagnetic (EM) follow-up observations of gravitational wave (GW) events will help shed light on the nature of the sources, and more can be learned if the EM follow-ups can start as soon as the GW event becomes observable. In this paper, we propose a computationally efficient time-domain algorithm capable of detec... |
gr-qc/0506077 | Nigel Bishop | Liebrecht R. Venter and Nigel T. Bishop | Numerical validation of the Kerr metric in Bondi-Sachs form | 10 pages | Phys.Rev.D73:084023,2006 | 10.1103/PhysRevD.73.084023 | null | gr-qc | null | A metric representing the Kerr geometry has been obtained by Pretorius and
Israel. We make a coordinate transformation on this metric, thereby bringing it
into Bondi-Sachs form. In order to validate the metric, we evaluate it
numerically on a regular grid of the new coordinates. The Ricci tensor is then
computed, for... | [
{
"created": "Mon, 13 Jun 2005 07:45:35 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Venter",
"Liebrecht R.",
""
],
[
"Bishop",
"Nigel T.",
""
]
] | A metric representing the Kerr geometry has been obtained by Pretorius and Israel. We make a coordinate transformation on this metric, thereby bringing it into Bondi-Sachs form. In order to validate the metric, we evaluate it numerically on a regular grid of the new coordinates. The Ricci tensor is then computed, for d... |
2005.08220 | Suman Ghosh | Suman Ghosh | Particle creation by a massless spin-$\frac{1}{2}$ field in a warped
cosmological braneworld scenario | 24 preprint pages, 3 figures. Here we correct few overall sign
mistakes appeared in e-Print: 1506.06909 [gr-qc] and e-Print: 1601.05518
[gr-qc] | JCAP08(2020)040 | 10.1088/1475-7516/2020/08/040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Energy momentum tensor of a quantized massless bulk spin-$\frac{1}{2}$ field
in five dimensional warped cosmological spacetimes is studied. The four
dimensional part of our model represents a warped cosmological thick brane and
the scale of the extra dimension is time-dependent. We use a simple ansatz to
solve the Di... | [
{
"created": "Sun, 17 May 2020 11:04:29 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Aug 2020 16:47:02 GMT",
"version": "v2"
}
] | 2020-08-25 | [
[
"Ghosh",
"Suman",
""
]
] | Energy momentum tensor of a quantized massless bulk spin-$\frac{1}{2}$ field in five dimensional warped cosmological spacetimes is studied. The four dimensional part of our model represents a warped cosmological thick brane and the scale of the extra dimension is time-dependent. We use a simple ansatz to solve the Dira... |
1610.05357 | Jay Tasson | Jay D. Tasson | The Standard-Model Extension and Gravitational Tests | Review of SME-gravity results plus new constraints, 16 pages, 5
figures, accepted for publication in Symmetry | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard-Model Extension (SME) provides a comprehensive effective
field-theory framework for the study of CPT and Lorentz symmetry. This work
reviews the structure and philosophy of the SME and provides some intuitive
examples of symmetry violation. The results of recent gravitational tests
performed within the S... | [
{
"created": "Tue, 11 Oct 2016 15:48:35 GMT",
"version": "v1"
}
] | 2016-10-19 | [
[
"Tasson",
"Jay D.",
""
]
] | The Standard-Model Extension (SME) provides a comprehensive effective field-theory framework for the study of CPT and Lorentz symmetry. This work reviews the structure and philosophy of the SME and provides some intuitive examples of symmetry violation. The results of recent gravitational tests performed within the SME... |
1303.2392 | Juan Carlos Degollado | Juan Carlos Degollado, Carlos A. R. Herdeiro | Stationary scalar configurations around extremal charged black holes | 5 pages, 4 figures | null | 10.1007/s10714-013-1598-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the minimally coupled Klein-Gordon equation for a charged,
massive scalar field in the non-extremal Reissner-Nordstr\"om background.
Performing a frequency domain analysis, using a continued fraction method, we
compute the frequencies \omega for quasi-bound states. We observe that, as the
extremal limit f... | [
{
"created": "Sun, 10 Mar 2013 23:16:09 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Degollado",
"Juan Carlos",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
]
] | We consider the minimally coupled Klein-Gordon equation for a charged, massive scalar field in the non-extremal Reissner-Nordstr\"om background. Performing a frequency domain analysis, using a continued fraction method, we compute the frequencies \omega for quasi-bound states. We observe that, as the extremal limit for... |
2307.09328 | Arash Hajibarat | Alireza Azizallahi, Behrouz Mirza, Arash Hajibarat and Homayon
Anjomshoa | Three parameter metrics in the presence of a scalar field in four and
higher dimensions | 12 pages, 9 figures | Nuclear Physics B 998 (2024) 116414 | 10.1016/j.nuclphysb.2023.116414 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a class of three parameter metrics that contain both the
$\gamma$-metric and Janis-Newman-Winicour (JNW) metric at special values of the
parameters. To see the effect of the scalar field we derive some properties of
this class of metrics such as curvature invariants, the effective potential,
and epicyc... | [
{
"created": "Tue, 18 Jul 2023 15:11:36 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2023 10:58:13 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Azizallahi",
"Alireza",
""
],
[
"Mirza",
"Behrouz",
""
],
[
"Hajibarat",
"Arash",
""
],
[
"Anjomshoa",
"Homayon",
""
]
] | We investigate a class of three parameter metrics that contain both the $\gamma$-metric and Janis-Newman-Winicour (JNW) metric at special values of the parameters. To see the effect of the scalar field we derive some properties of this class of metrics such as curvature invariants, the effective potential, and epicycli... |
1311.1238 | Steffen Gielen | Steffen Gielen, Daniele Oriti, Lorenzo Sindoni | Homogeneous cosmologies as group field theory condensates | 50 pages (including three appendices), revtex; v2: expanded
discussion of effective cosmological dynamics in Sec. V B, few minor
modifications in the rest, unchanged results, v3: minor clarifying
modifications following referee's suggestions, unchanged results, v4: typos
corrected, matches published version | JHEP 1406 (2014) 013 | 10.1007/JHEP06(2014)013 | AEI-2013-259 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a general procedure, in the group field theory (GFT) formalism for
quantum gravity, for constructing states that describe macroscopic, spatially
homogeneous universes. These states are close to coherent (condensate) states
used in the description of Bose-Einstein condensates. The condition on such
states to b... | [
{
"created": "Tue, 5 Nov 2013 22:17:37 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jan 2014 19:45:29 GMT",
"version": "v2"
},
{
"created": "Thu, 1 May 2014 00:00:24 GMT",
"version": "v3"
},
{
"created": "Tue, 27 May 2014 14:15:00 GMT",
"version": "v4"
}
] | 2014-06-06 | [
[
"Gielen",
"Steffen",
""
],
[
"Oriti",
"Daniele",
""
],
[
"Sindoni",
"Lorenzo",
""
]
] | We give a general procedure, in the group field theory (GFT) formalism for quantum gravity, for constructing states that describe macroscopic, spatially homogeneous universes. These states are close to coherent (condensate) states used in the description of Bose-Einstein condensates. The condition on such states to be ... |
1308.1234 | Vasilis Oikonomou | V.K. Oikonomou | An Electric Analogue to Gravity Induced Vacuum Dominance | Revised Version | null | 10.1134/S0202289313030092 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that when a strong electric field is turned on as a background in
a charged scalar field, the vacuum state of the scalar field becomes
exponentially amplified. This is an analogue to gravity induced vacuum
amplification, where the vacuum state becomes exponentially amplified for some
geometries.
| [
{
"created": "Tue, 6 Aug 2013 11:02:33 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Oikonomou",
"V. K.",
""
]
] | It is shown that when a strong electric field is turned on as a background in a charged scalar field, the vacuum state of the scalar field becomes exponentially amplified. This is an analogue to gravity induced vacuum amplification, where the vacuum state becomes exponentially amplified for some geometries. |
1807.10411 | Kiyoshi Shiraishi | Nahomi Kan, Kiyoshi Shiraishi | An ostentatious model of cosmological scalar-tensor theory | 10 pages, no figure, references added, a few typo fixed | Modern Physics Letters A34 (2019) no.19, 1950144 | 10.1142/S021773231950144X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a novel model of gravity with a scalar field described by the
Lagrangian with higher order derivative terms in a cosmological context. The
model has the same solution for the homogeneous and isotropic universe as in
the model with the Einstein gravity, notwithstanding the additional higher
order terms. A ... | [
{
"created": "Fri, 27 Jul 2018 01:45:54 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Aug 2018 06:42:30 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Aug 2018 00:49:36 GMT",
"version": "v3"
}
] | 2019-07-04 | [
[
"Kan",
"Nahomi",
""
],
[
"Shiraishi",
"Kiyoshi",
""
]
] | We consider a novel model of gravity with a scalar field described by the Lagrangian with higher order derivative terms in a cosmological context. The model has the same solution for the homogeneous and isotropic universe as in the model with the Einstein gravity, notwithstanding the additional higher order terms. A po... |
gr-qc/0203029 | Hagen Kleinert | Hagen Kleinert | Nonholonomic Mapping Principle for Classical and Quantum Mechanics in
Spaces with Curvature and Torsion | Author Information under
http://www.physik.fu-berlin.de/~kleinert/institution.html . Paper also at
http://www.physik.fu-berlin.de/~kleinert/258 | null | null | null | gr-qc | null | I explain the geometric basis for the recently-discovered nonholonomic
mapping principle which permits deriving laws of nature in spacetimes with
curvature and torsion from those in flat spacetime, thus replacing and
extending Einstein's equivalence principle. As an important consequence, it
yields a new action princ... | [
{
"created": "Sat, 9 Mar 2002 10:36:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kleinert",
"Hagen",
""
]
] | I explain the geometric basis for the recently-discovered nonholonomic mapping principle which permits deriving laws of nature in spacetimes with curvature and torsion from those in flat spacetime, thus replacing and extending Einstein's equivalence principle. As an important consequence, it yields a new action princip... |
1310.1009 | Dijana Tolic | N. Bilic, D. Tolic | Analogue cosmology in a hadronic fluid | 6 pages, 1 figure, based on the presentation by DT at BW2013 - Beyond
the standard models, April 2013, Vrnjacka Banja, Serbia | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The expansion of hadronic matter that takes place immediately after a heavy
ion collision has certain similarity with the cosmological expansion. We study
the analogue geometry of the expanding hadronic fluid, using the the formalism
of relativistic acoustic geometry. We show that the propagation of massless
pions pr... | [
{
"created": "Thu, 3 Oct 2013 15:32:53 GMT",
"version": "v1"
}
] | 2013-10-04 | [
[
"Bilic",
"N.",
""
],
[
"Tolic",
"D.",
""
]
] | The expansion of hadronic matter that takes place immediately after a heavy ion collision has certain similarity with the cosmological expansion. We study the analogue geometry of the expanding hadronic fluid, using the the formalism of relativistic acoustic geometry. We show that the propagation of massless pions prov... |
gr-qc/9401026 | null | M. Gasperini | Relaxed Bounds on the Dilaton Mass in a String Cosmology Scenario | 12 pages, plain tex, 2 figures (available on request) DFTT-03/94 | Phys.Lett. B327 (1994) 214-220 | 10.1016/0370-2693(94)90720-X | null | gr-qc astro-ph hep-th | null | We discuss bounds on the dilaton mass, following from the cosmological
amplification of the quantum fluctuations of the dilaton background, under the
assumption that such fluctuations are dominant with respect to the classical
background oscillations. We show that if the fluctuation spectrum grows with
the frequency ... | [
{
"created": "Tue, 25 Jan 1994 19:21:39 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Gasperini",
"M.",
""
]
] | We discuss bounds on the dilaton mass, following from the cosmological amplification of the quantum fluctuations of the dilaton background, under the assumption that such fluctuations are dominant with respect to the classical background oscillations. We show that if the fluctuation spectrum grows with the frequency th... |
2201.11102 | Daniel Blixt | Daniel Blixt, Rafael Ferraro, Alexey Golovnev and Mar\'ia-Jos\'e
Guzm\'an | Lorentz gauge-invariant variables in torsion-based theories of gravity | 7 pages, matches the published version | Phys. Rev. D 105, 084029 (2022) | 10.1103/PhysRevD.105.084029 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | General relativity dynamics can be derived from different actions -- which
depart from the Einstein-Hilbert action in boundary terms -- and for different
choices of the dynamical variables. Among them, the teleparallel equivalent of
general relativity is a torsion-based theory for the tetrad field. More general
torsi... | [
{
"created": "Wed, 26 Jan 2022 18:19:42 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2022 18:32:28 GMT",
"version": "v2"
}
] | 2022-05-03 | [
[
"Blixt",
"Daniel",
""
],
[
"Ferraro",
"Rafael",
""
],
[
"Golovnev",
"Alexey",
""
],
[
"Guzmán",
"María-José",
""
]
] | General relativity dynamics can be derived from different actions -- which depart from the Einstein-Hilbert action in boundary terms -- and for different choices of the dynamical variables. Among them, the teleparallel equivalent of general relativity is a torsion-based theory for the tetrad field. More general torsion... |
2109.12849 | Hamidreza Simchi | Hamidreza Simchi | Statistical Representation of Spacetime | null | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | It is assumed that the spacetime is composed by events and can be explained
by partially ordered set (causal set). The parent events born two kinds of
children. Some children have a causal relation with their parents and other
kinds have not. It is assumed that evolution of the population is only happen
by the causal... | [
{
"created": "Mon, 27 Sep 2021 07:46:27 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2022 11:55:59 GMT",
"version": "v2"
}
] | 2022-03-31 | [
[
"Simchi",
"Hamidreza",
""
]
] | It is assumed that the spacetime is composed by events and can be explained by partially ordered set (causal set). The parent events born two kinds of children. Some children have a causal relation with their parents and other kinds have not. It is assumed that evolution of the population is only happen by the causal c... |
1408.3212 | Asoke Sen Dr. | Saswati Roy and A.K. Sen | Trajectory of a light ray in Kerr field: A material medium approach | null | Astrophysics and Space Science, Manuscript number:
ASTR-D-15-00567R2, 2015 | 10.1007/s10509-015-2538-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The deflection of light ray as it passes around a gravitational mass can be
calculated by different methods. Such calculations are generally done by using
the null geodesics under both strong field and weak field approximation.
However, several authors have studied the gravitational deflection of light ray
using mate... | [
{
"created": "Thu, 14 Aug 2014 08:04:17 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2015 10:49:34 GMT",
"version": "v2"
}
] | 2015-10-19 | [
[
"Roy",
"Saswati",
""
],
[
"Sen",
"A. K.",
""
]
] | The deflection of light ray as it passes around a gravitational mass can be calculated by different methods. Such calculations are generally done by using the null geodesics under both strong field and weak field approximation. However, several authors have studied the gravitational deflection of light ray using materi... |
1809.04989 | Marcel Reginatto | Marcel Reginatto and Michael J. W. Hall | Entanglement of quantum fields via classical gravity | 27 pages | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the coupling of quantum fields to classical gravity in the
formalism of ensembles on configuration space, a model that allows a consistent
formulation of interacting classical and quantum systems. Explicit calculations
show that there are solutions for which two quantum fields are in an entangled
state, e... | [
{
"created": "Thu, 13 Sep 2018 14:27:52 GMT",
"version": "v1"
}
] | 2018-09-19 | [
[
"Reginatto",
"Marcel",
""
],
[
"Hall",
"Michael J. W.",
""
]
] | We consider the coupling of quantum fields to classical gravity in the formalism of ensembles on configuration space, a model that allows a consistent formulation of interacting classical and quantum systems. Explicit calculations show that there are solutions for which two quantum fields are in an entangled state, eve... |
1207.0882 | Miguel Pino | Hernan A. Gonzalez, Miguel Pino | Asymptotically flat spacetimes in 3D bigravity | 6 pages | null | 10.1103/PhysRevD.86.084045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report that a class of three-dimensional bimetric theories contain
asymptotically flat solutions. These spacetimes can be cast in a set of
asymptotic conditions at null infinity which are preserved under the infinite
dimensional BMS group. Moreover, the algebra of the canonical generators
exhibits a central extens... | [
{
"created": "Wed, 4 Jul 2012 02:49:08 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Gonzalez",
"Hernan A.",
""
],
[
"Pino",
"Miguel",
""
]
] | We report that a class of three-dimensional bimetric theories contain asymptotically flat solutions. These spacetimes can be cast in a set of asymptotic conditions at null infinity which are preserved under the infinite dimensional BMS group. Moreover, the algebra of the canonical generators exhibits a central extensio... |
1108.6052 | Emmanuil Saridakis | Yi-Fu Cai (Arizona State U.), Emmanuel N. Saridakis (Baylor U.) | Non-singular Cyclic Cosmology without Phantom Menace | 16 pages, 2 figures, to appear in Journal of Cosmology | Journal of Cosmology, Volume 17, 7238-7254 (2011) | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we review recent developments of cyclic cosmology. A typical
non-singular cyclic model within General Relativity requires a non-conventional
fluid with negative effective energy density, in order to cancel the matter
component and lead to a non-singular bounce. However, the existence of such a
non-con... | [
{
"created": "Tue, 30 Aug 2011 15:47:19 GMT",
"version": "v1"
}
] | 2012-01-24 | [
[
"Cai",
"Yi-Fu",
"",
"Arizona State U."
],
[
"Saridakis",
"Emmanuel N.",
"",
"Baylor U."
]
] | In this article we review recent developments of cyclic cosmology. A typical non-singular cyclic model within General Relativity requires a non-conventional fluid with negative effective energy density, in order to cancel the matter component and lead to a non-singular bounce. However, the existence of such a non-conve... |
0911.0241 | Morgan Le Delliou | Morgan Le Delliou (IFT, CFTC), Filipe C. Mena (CMAT), Jos\'e Pedro
Mimoso (CFTC, Dful) | Separating expansion from contraction: generalized TOV condition, LTB
models with pressure and $\Lambda$CDM | Proceedings of 'Invisible Universe International Conference', Paris,
June 29- July 3, 2009 ; 5pp, 4 figs | AIP Conf.Proc.1241:1011-1015,2010 | 10.1063/1.3462594 | IFT-UAM/CSIC-09-23 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the existence of a dividing shell separating expanding and
collapsing regions in spherically symmetric solutions with pressure. We obtain
gauge invariant conditions relating not only the intrinsic spatial curvature of
the shells to the ADM mass, but also a function of the pressure which we
introduce that g... | [
{
"created": "Mon, 2 Nov 2009 05:43:45 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Delliou",
"Morgan Le",
"",
"IFT, CFTC"
],
[
"Mena",
"Filipe C.",
"",
"CMAT"
],
[
"Mimoso",
"José Pedro",
"",
"CFTC, Dful"
]
] | We discuss the existence of a dividing shell separating expanding and collapsing regions in spherically symmetric solutions with pressure. We obtain gauge invariant conditions relating not only the intrinsic spatial curvature of the shells to the ADM mass, but also a function of the pressure which we introduce that gen... |
1911.04772 | George F. R. Ellis | George F R Ellis and Barbara Drossel | Emergence of time | 31 pages, 4 figures, 1 table. Revised in response to comments
received. Second author added | null | 10.1007/s10701-020-00331-x | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Microphysical laws are time reversible, but macrophysics, chemistry and
biology are not. This chapter explores how this asymmetry (a classic example of
a broken symmetry) arises due to the cosmological context, where a non-local
Direction of Time is imposed by the expansion of the universe. This situation
is best rep... | [
{
"created": "Tue, 12 Nov 2019 10:22:56 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Nov 2019 11:35:17 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Dec 2019 09:37:31 GMT",
"version": "v3"
}
] | 2020-03-18 | [
[
"Ellis",
"George F R",
""
],
[
"Drossel",
"Barbara",
""
]
] | Microphysical laws are time reversible, but macrophysics, chemistry and biology are not. This chapter explores how this asymmetry (a classic example of a broken symmetry) arises due to the cosmological context, where a non-local Direction of Time is imposed by the expansion of the universe. This situation is best repre... |
2009.14678 | Angel Rincon | Angel Rincon and Grigoris Panotopoulos | Scale-dependent slowly rotating black holes with flat horizon structure | 24 pages, 2 figures, published in Physics of the Dark Universe | Physics of the Dark Universe, ISSN: 2212-6864, Vol: 30, Year:
2020, Page: 100725 | 10.1016/j.dark.2020.100725 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study slowly rotating four-dimensional black holes with flat horizon
structure in scale-dependent gravity. First we obtain the solution, and then we
study thermodynamic properties as well as the invariants of the theory. The
impact of the scale-dependent parameter is investigated in detail. We find that
the scale-... | [
{
"created": "Wed, 30 Sep 2020 13:55:03 GMT",
"version": "v1"
}
] | 2020-10-01 | [
[
"Rincon",
"Angel",
""
],
[
"Panotopoulos",
"Grigoris",
""
]
] | We study slowly rotating four-dimensional black holes with flat horizon structure in scale-dependent gravity. First we obtain the solution, and then we study thermodynamic properties as well as the invariants of the theory. The impact of the scale-dependent parameter is investigated in detail. We find that the scale-de... |
1210.5269 | Alan Parry PhD | Alan R. Parry | A Survey of Spherically Symmetric Spacetimes | 27 pages, 1 figure, Analysis and Mathematical Physics, 2014 | Anal. Math. Phys. (2014) 4:333-375 | 10.1007/s13324-014-0085-x | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We survey many of the important properties of spherically symmetric
spacetimes as follows. We present several different ways of describing a
spherically symmetric spacetime and the resulting metrics. We then focus our
discussion on an especially useful form of the metric of a spherically
symmetric spacetime in polar-... | [
{
"created": "Thu, 18 Oct 2012 21:47:17 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Sep 2014 14:25:15 GMT",
"version": "v2"
}
] | 2014-10-10 | [
[
"Parry",
"Alan R.",
""
]
] | We survey many of the important properties of spherically symmetric spacetimes as follows. We present several different ways of describing a spherically symmetric spacetime and the resulting metrics. We then focus our discussion on an especially useful form of the metric of a spherically symmetric spacetime in polar-ar... |
1404.7482 | Florent Michel | Florent Michel and Renaud Parentani | Probing the thermal character of analogue Hawking radiation for shallow
water waves? | 23 pages, 14 figures, 2 figures updated to match the PRD version,
final version published in Physical Review D | Phys. Rev. D 90, 044033 (2014) | 10.1103/PhysRevD.90.044033 | LPT-Orsay-14-51 | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study and numerically compute the scattering coefficients of shallow water
waves blocked by a stationary counterflow. When the flow is transcritical, the
coefficients closely follow Hawking's prediction according to which black holes
should emit a thermal spectrum. We study how the spectrum deviates from
thermalit... | [
{
"created": "Tue, 29 Apr 2014 19:48:47 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 2014 16:56:13 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Sep 2014 18:27:41 GMT",
"version": "v3"
}
] | 2014-09-16 | [
[
"Michel",
"Florent",
""
],
[
"Parentani",
"Renaud",
""
]
] | We study and numerically compute the scattering coefficients of shallow water waves blocked by a stationary counterflow. When the flow is transcritical, the coefficients closely follow Hawking's prediction according to which black holes should emit a thermal spectrum. We study how the spectrum deviates from thermality ... |
gr-qc/9611027 | null | D. Babusci, H. Fang, G. Giordano, G. Matone, L. Matone and V.
Sannibale (INFN Frascati) | Alignment procedure for the VIRGO Interferometer: experimental results
from the Frascati prototype | 10 pages, LaTex2e, 4 figures, 5 tables. Submitted to Phys. Lett. A | Phys.Lett. A226 (1997) 31-40 | 10.1016/S0375-9601(96)00907-3 | LNF-96/034 (P) | gr-qc | null | A small fixed-mirror Michelson interferometer has been built in Frascati to
experimentally study the alignment method that has been suggested for VIRGO.
The experimental results fully confirm the adequacy of the method. The minimum
angular misalignment that can be detected in the present set-up is 10
nrad/sqrt{Hz}
| [
{
"created": "Mon, 11 Nov 1996 16:40:07 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Babusci",
"D.",
"",
"INFN Frascati"
],
[
"Fang",
"H.",
"",
"INFN Frascati"
],
[
"Giordano",
"G.",
"",
"INFN Frascati"
],
[
"Matone",
"G.",
"",
"INFN Frascati"
],
[
"Matone",
"L.",
"",
"INFN Frascati"
],
[
"San... | A small fixed-mirror Michelson interferometer has been built in Frascati to experimentally study the alignment method that has been suggested for VIRGO. The experimental results fully confirm the adequacy of the method. The minimum angular misalignment that can be detected in the present set-up is 10 nrad/sqrt{Hz} |
2312.10241 | Aasim Jan | Aasim Jan, Deborah Ferguson, Jacob Lange, Deirdre Shoemaker, Aaron
Zimmerman | Accuracy limitations of existing numerical relativity waveforms on the
data analysis of current and future ground-based detectors | 22 pages, 16 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | As gravitational wave detectors improve in sensitivity, signal-to-noise
ratios of compact binary coalescences will dramatically increase, reaching
values in the hundreds and potentially thousands. Such strong signals offer
both exciting scientific opportunities and pose formidable challenges to the
template waveforms... | [
{
"created": "Fri, 15 Dec 2023 22:18:56 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 2024 15:46:49 GMT",
"version": "v2"
}
] | 2024-08-15 | [
[
"Jan",
"Aasim",
""
],
[
"Ferguson",
"Deborah",
""
],
[
"Lange",
"Jacob",
""
],
[
"Shoemaker",
"Deirdre",
""
],
[
"Zimmerman",
"Aaron",
""
]
] | As gravitational wave detectors improve in sensitivity, signal-to-noise ratios of compact binary coalescences will dramatically increase, reaching values in the hundreds and potentially thousands. Such strong signals offer both exciting scientific opportunities and pose formidable challenges to the template waveforms u... |
1411.1417 | Farook Rahaman | Ahmad T. Ali, Anil Kumar Yadav, Farook Rahaman and Arkopriya Mallick | Some Invariant String Cosmological Models in Cylindrically Symmetric
Space-time | Published in Phys.Scripta 89 (2014) 11, 115206. arXiv admin note:
text overlap with arXiv:1405.3185, arXiv:1305.4631 | Phys.Scripta 89 (2014) 11, 115206 | 10.1088/0031-8949/89/11/115206 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we derive some new invariant solutions of Einstein-Maxwell's
field equations for string fluid as source of matter in cylindrically symmetric
space-time with Variable Magnetic Permeability. We also discuss the physical
and eometrical properties of the models derived in the paper. The solutions, at
least ... | [
{
"created": "Thu, 24 Jul 2014 19:26:33 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 2015 18:17:01 GMT",
"version": "v2"
}
] | 2015-01-09 | [
[
"Ali",
"Ahmad T.",
""
],
[
"Yadav",
"Anil Kumar",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Mallick",
"Arkopriya",
""
]
] | In this paper we derive some new invariant solutions of Einstein-Maxwell's field equations for string fluid as source of matter in cylindrically symmetric space-time with Variable Magnetic Permeability. We also discuss the physical and eometrical properties of the models derived in the paper. The solutions, at least on... |
2112.04040 | Felipe Poulis | F. P. Poulis and M. A. C. Soares | Exact modifications on a vacuum spacetime due to a gradient bumblebee
field at its vacuum expectation value | null | Eur. Phys. J. C 82, 613 (2022) | 10.1140/epjc/s10052-022-10547-y | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | This work belongs to the context of the standard-model extension, in which a
Lorentz symmetry violation is induced by a bumblebee field as it acquires a
nonzero vacuum expectation value. The mathematical formulation of a generic
bumblebee model and its associated dynamical equations are presented. Then,
these equatio... | [
{
"created": "Tue, 7 Dec 2021 23:29:02 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jul 2022 15:16:11 GMT",
"version": "v2"
}
] | 2022-07-19 | [
[
"Poulis",
"F. P.",
""
],
[
"Soares",
"M. A. C.",
""
]
] | This work belongs to the context of the standard-model extension, in which a Lorentz symmetry violation is induced by a bumblebee field as it acquires a nonzero vacuum expectation value. The mathematical formulation of a generic bumblebee model and its associated dynamical equations are presented. Then, these equations... |
0804.3529 | Steven Detweiler | Steven Detweiler | A consequence of the gravitational self-force for circular orbits of the
Schwarzschild geometry | 15 pages, 2 figures, 1 table | Phys.Rev.D77:124026,2008 | 10.1103/PhysRevD.77.124026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A small mass \mu in orbit about a much more massive black hole M moves along
a world line that deviates from a geodesic of the black hole geometry by
O(\mu/M). This deviation is said to be caused by the gravitational self-force
of the metric perturbation h_{ab} from \mu. For circular orbits about a
non-rotating black... | [
{
"created": "Tue, 22 Apr 2008 13:36:53 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Detweiler",
"Steven",
""
]
] | A small mass \mu in orbit about a much more massive black hole M moves along a world line that deviates from a geodesic of the black hole geometry by O(\mu/M). This deviation is said to be caused by the gravitational self-force of the metric perturbation h_{ab} from \mu. For circular orbits about a non-rotating black h... |
gr-qc/9603018 | Serge Massar | S. Massar and R. Parentani | Comment on ``Vanishing Hawking Radiation from a Uniformly Accelerated
Black Hole'', P. Yi, Phys. Rev. Lett. 75 (1995) 382 | Latex, 5 pages | Phys.Rev.Lett. 78 (1997) 4526-4527 | 10.1103/PhysRevLett.78.4526 | TAU 2325-96 LPTENS 96/17 | gr-qc | null | We argue that the analysis of transients, of decoherence effects, or of any
breaking of the exact boost invariance of the Ernst metric shows that uniformly
accelerated black holes do emit an energy flux given by the Doppler-shifted
Hawking radiation, in perfect {\it agreement} to what happens for accelerated
particle... | [
{
"created": "Tue, 12 Mar 1996 16:20:25 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Massar",
"S.",
""
],
[
"Parentani",
"R.",
""
]
] | We argue that the analysis of transients, of decoherence effects, or of any breaking of the exact boost invariance of the Ernst metric shows that uniformly accelerated black holes do emit an energy flux given by the Doppler-shifted Hawking radiation, in perfect {\it agreement} to what happens for accelerated particles. |
gr-qc/0202067 | Shinji Tsujikawa | Alexey Toporensky, Shinji Tsujikawa | Nature of singularities in anisotropic string cosmology | 21 pages, 8 figures | Phys.Rev. D65 (2002) 123509 | 10.1103/PhysRevD.65.123509 | null | gr-qc astro-ph hep-ph hep-th | null | We study nature of singularities in anisotropic string-inspired cosmological
models in the presence of a Gauss-Bonnet term. We analyze two string gravity
models-- dilaton-driven and modulus-driven cases-- in the Bianchi type-I
background without an axion field. In both scenarios singularities can be
classified in two... | [
{
"created": "Tue, 19 Feb 2002 04:16:41 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2002 06:38:20 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Toporensky",
"Alexey",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We study nature of singularities in anisotropic string-inspired cosmological models in the presence of a Gauss-Bonnet term. We analyze two string gravity models-- dilaton-driven and modulus-driven cases-- in the Bianchi type-I background without an axion field. In both scenarios singularities can be classified in two w... |
1610.02408 | Joshua Cooperman | Joshua H. Cooperman, Kyle Lee, Jonah M. Miller | A second look at transition amplitudes in (2+1)-dimensional causal
dynamical triangulations | 19+7 pages, 14 figures | null | 10.1088/1361-6382/aa6d38 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Studying transition amplitudes in (2+1)-dimensional causal dynamical
triangulations, Cooperman and Miller discovered speculative evidence for
Lorentzian quantum geometries emerging from its Euclidean path integral. On the
basis of this evidence, Cooperman and Miller conjectured that Lorentzian de
Sitter spacetime, no... | [
{
"created": "Fri, 7 Oct 2016 20:01:22 GMT",
"version": "v1"
}
] | 2017-05-31 | [
[
"Cooperman",
"Joshua H.",
""
],
[
"Lee",
"Kyle",
""
],
[
"Miller",
"Jonah M.",
""
]
] | Studying transition amplitudes in (2+1)-dimensional causal dynamical triangulations, Cooperman and Miller discovered speculative evidence for Lorentzian quantum geometries emerging from its Euclidean path integral. On the basis of this evidence, Cooperman and Miller conjectured that Lorentzian de Sitter spacetime, not ... |
2310.16893 | Giulia Fumagalli | Giulia Fumagalli, Davide Gerosa | Spin-eccentricity interplay in merging binary black holes | 11 pages, 8 figures | Phys. Rev. D 108, 124055 (2023) | 10.1103/PhysRevD.108.124055 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Orbital eccentricity and spin precession are precious observables to infer
the formation history of binary black holes with gravitational-wave data. We
present a post-Newtonian, multi-timescale analysis of the binary dynamics able
to capture both precession and eccentricity over long inspirals. We show that
the evolu... | [
{
"created": "Wed, 25 Oct 2023 18:00:05 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2024 15:37:52 GMT",
"version": "v2"
}
] | 2024-01-19 | [
[
"Fumagalli",
"Giulia",
""
],
[
"Gerosa",
"Davide",
""
]
] | Orbital eccentricity and spin precession are precious observables to infer the formation history of binary black holes with gravitational-wave data. We present a post-Newtonian, multi-timescale analysis of the binary dynamics able to capture both precession and eccentricity over long inspirals. We show that the evoluti... |
gr-qc/9911072 | Marie-Noelle Celerier | Marie-No\"elle C\'el\'erier (Observatoire de Paris-Meudon) | Solving the horizon problem with a Delayed Big-Bang singularity | 6 pages, published in the Proceedings of the Second International
Workshop on New Worlds in Astroparticle Physics, Eds. Ana M. Mourao, Mario
Pimenta and Paulo Sa, World Scientific, Singapore, 1999, p.265-270 | in ''Proceedings of the Second International Workshop on New
worlds in Astroparticle Physics'' Eds. Ana M. Mourao, Mario Pimenta and Paulo
Sa (World Scientific, Singapore) 1999, p.265-270 | null | null | gr-qc astro-ph | null | The hot Big-Bang standard model for the evolution of the universe, despite
strong successes, lets unresolved a number of problems. One of its main
drawbacks, known as the horizon problem, was until now thought to be only
solvable by an inflationary scenario. Here is proposed a class of inhomogeneous
models of univers... | [
{
"created": "Fri, 19 Nov 1999 15:14:12 GMT",
"version": "v1"
}
] | 2011-10-31 | [
[
"Célérier",
"Marie-Noëlle",
"",
"Observatoire de Paris-Meudon"
]
] | The hot Big-Bang standard model for the evolution of the universe, despite strong successes, lets unresolved a number of problems. One of its main drawbacks, known as the horizon problem, was until now thought to be only solvable by an inflationary scenario. Here is proposed a class of inhomogeneous models of universe,... |
gr-qc/9706012 | Linux User Rhs | Orfeu Bertolami | Lorentz Invariance and the Cosmological Constant | 13 pages, plain Latex. This essay was selected for an honorable
mention in the 1997 Gravity Research Foundation essay competion | Class.Quant.Grav. 14 (1997) 2785-2791 | 10.1088/0264-9381/14/10/007 | DF/IST-3.97 | gr-qc | null | Non-trivial solutions in string field theory may lead to the spontaneous
breaking of Lorentz invariance and to new tensor-matter interactions. It is
argued that requiring the contribution of the vacuum expectation values of
Lorentz tensors to account for the vacuum energy up to the level that
$\Omega_{0}^{\Lambda} = ... | [
{
"created": "Wed, 4 Jun 1997 12:18:10 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bertolami",
"Orfeu",
""
]
] | Non-trivial solutions in string field theory may lead to the spontaneous breaking of Lorentz invariance and to new tensor-matter interactions. It is argued that requiring the contribution of the vacuum expectation values of Lorentz tensors to account for the vacuum energy up to the level that $\Omega_{0}^{\Lambda} = 0.... |
gr-qc/0505031 | Yury F. Pirogov | Yu. F. Pirogov | General covariance violation and the gravitational dark matter. I.
Scalar graviton | 11 pages; minor corrections | Phys.Atom.Nucl. 69 (2006) 1338-1344; Yad.Fiz. 69 (2006) 1374-1380 | 10.1134/S1063778806080102 | IHEP 2005-15 | gr-qc astro-ph hep-ph | null | The violation of the general covariance is proposed as a resource of the
gravitational dark matter. The minimal violation of the covariance to the
unimodular one is associated with the massive scalar graviton as the simplest
representative of such a matter. The Lagrangian formalism for the continuous
medium, the perf... | [
{
"created": "Mon, 9 May 2005 19:03:42 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2005 17:10:42 GMT",
"version": "v2"
},
{
"created": "Fri, 27 May 2005 17:02:26 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Sep 2005 18:32:56 GMT",
"version": "v4"
}
] | 2009-11-11 | [
[
"Pirogov",
"Yu. F.",
""
]
] | The violation of the general covariance is proposed as a resource of the gravitational dark matter. The minimal violation of the covariance to the unimodular one is associated with the massive scalar graviton as the simplest representative of such a matter. The Lagrangian formalism for the continuous medium, the perfec... |
2306.16952 | Alessandro Fabbri | Roberto Balbinot and Alessandro Fabbri | The Hawking effect in the particles-partners correlations | 20 pages, 17 figures. Final version | Physics 2023, 5, 968-982 | 10.3390/physics5040063 | null | gr-qc cond-mat.quant-gas hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the correlations functions across the horizon in Hawking black
hole radiation to reveal the correlations between Hawking particles and their
partners. The effects of the underlying space-time on this are shown in various
examples ranging from acoustic black holes to regular black holes.
| [
{
"created": "Thu, 29 Jun 2023 13:53:57 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2023 14:16:12 GMT",
"version": "v2"
}
] | 2023-09-28 | [
[
"Balbinot",
"Roberto",
""
],
[
"Fabbri",
"Alessandro",
""
]
] | We analyze the correlations functions across the horizon in Hawking black hole radiation to reveal the correlations between Hawking particles and their partners. The effects of the underlying space-time on this are shown in various examples ranging from acoustic black holes to regular black holes. |
1411.4793 | Sandipan Sengupta | Romesh K. Kaul and Sandipan Sengupta | Torsional instanton effects in quantum gravity | Published version | Phys. Rev. D 90, 124081 (2014) | 10.1103/PhysRevD.90.124081 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, in the first order gravity theory coupled to axions, the
instanton number of the Giddings-Strominger wormhole can be interpreted as the
Nieh-Yan topological index. The axion charge of the baby universes is quantized
in terms of the Nieh-Yan integers. Tunneling between universes of different
Nieh-Yan cha... | [
{
"created": "Tue, 18 Nov 2014 10:22:19 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jan 2015 11:42:52 GMT",
"version": "v2"
}
] | 2015-01-06 | [
[
"Kaul",
"Romesh K.",
""
],
[
"Sengupta",
"Sandipan",
""
]
] | We show that, in the first order gravity theory coupled to axions, the instanton number of the Giddings-Strominger wormhole can be interpreted as the Nieh-Yan topological index. The axion charge of the baby universes is quantized in terms of the Nieh-Yan integers. Tunneling between universes of different Nieh-Yan charg... |
1807.07163 | Blake Moore | Blake Moore, Travis Robson, Nicholas Loutrel, and Nicolas Yunes | A Fourier Domain Waveform for Non-Spinning Binaries with Arbitrary
Eccentricity | 27 pages, 13 figures | null | 10.1088/1361-6382/aaea00 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although the gravitational waves observed by advanced LIGO and Virgo are
consistent with compact binaries in a quasi-circular inspiral prior to
coalescence, eccentric inspirals are also expected to occur in Nature. Due to
their complexity, we currently lack ready-to-use, analytic waveforms in the
Fourier domain valid... | [
{
"created": "Wed, 18 Jul 2018 21:24:27 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Moore",
"Blake",
""
],
[
"Robson",
"Travis",
""
],
[
"Loutrel",
"Nicholas",
""
],
[
"Yunes",
"Nicolas",
""
]
] | Although the gravitational waves observed by advanced LIGO and Virgo are consistent with compact binaries in a quasi-circular inspiral prior to coalescence, eccentric inspirals are also expected to occur in Nature. Due to their complexity, we currently lack ready-to-use, analytic waveforms in the Fourier domain valid f... |
2303.04907 | Wei-Liang Qian | Wen-Hao Wu, Cheng-Yong Zhang, Cheng-Gang Shao and Wei-Liang Qian | Onset of chaotic gravitational lensing in non-Kerr rotating black holes
with quadrupole mass moment | 18 pages, 13 figures | null | 10.1088/1674-1137/acd83e | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the electromagnetic channel, chaotic gravitational lensing is a peculiar
phenomenon in strong gravitational lensing. In this work, we analyze the
properties and emergence of chaotic gravitational lensing in the Manko-Novikov
black hole spacetime. Aiming to understand better the underlying physics, we
elaborate on ... | [
{
"created": "Wed, 8 Mar 2023 21:52:12 GMT",
"version": "v1"
},
{
"created": "Sun, 7 May 2023 14:52:52 GMT",
"version": "v2"
}
] | 2023-07-19 | [
[
"Wu",
"Wen-Hao",
""
],
[
"Zhang",
"Cheng-Yong",
""
],
[
"Shao",
"Cheng-Gang",
""
],
[
"Qian",
"Wei-Liang",
""
]
] | In the electromagnetic channel, chaotic gravitational lensing is a peculiar phenomenon in strong gravitational lensing. In this work, we analyze the properties and emergence of chaotic gravitational lensing in the Manko-Novikov black hole spacetime. Aiming to understand better the underlying physics, we elaborate on th... |
1902.07527 | Gregorio Carullo | Gregorio Carullo, Walter Del Pozzo, John Veitch | Observational Black Hole Spectroscopy: A time-domain multimode analysis
of GW150914 | 9 pages, 8 figures | Phys. Rev. D 99, 123029 (2019) | 10.1103/PhysRevD.99.123029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of the least damped quasi-normal mode from the remnant of the
gravitational wave event GW150914 realised the long sought possibility to
observationally study the properties of quasi-stationary black hole spacetimes
through gravitational waves. Past literature has extensively explored this
possibility an... | [
{
"created": "Wed, 20 Feb 2019 11:55:29 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jun 2019 09:31:32 GMT",
"version": "v2"
}
] | 2019-07-03 | [
[
"Carullo",
"Gregorio",
""
],
[
"Del Pozzo",
"Walter",
""
],
[
"Veitch",
"John",
""
]
] | The detection of the least damped quasi-normal mode from the remnant of the gravitational wave event GW150914 realised the long sought possibility to observationally study the properties of quasi-stationary black hole spacetimes through gravitational waves. Past literature has extensively explored this possibility and ... |
2309.01233 | Gopi Kant Goswami Dr | G. K. Goswami, Rita Rani, J. K. Singh and Anirudh Pradhan | An FLRW accelerating universe model in Weyl type $f(Q)$ gravity and
Observational Constraints | 13 pages, 5 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We propose to develop a cosmological model of the universe based on Weyl type
$ f(Q) $ gravity which shows the transition from decelerating in the past to
acceleration at present by considering a particular functional form of $ f(Q) $
gravity as $ f(Q) = ({H_0}^2) (\alpha_1 + \alpha_2 \hskip0.05in log ({H_0^{-2}}
Q))... | [
{
"created": "Sun, 3 Sep 2023 17:42:57 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2023 18:25:01 GMT",
"version": "v2"
}
] | 2023-09-12 | [
[
"Goswami",
"G. K.",
""
],
[
"Rani",
"Rita",
""
],
[
"Singh",
"J. K.",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | We propose to develop a cosmological model of the universe based on Weyl type $ f(Q) $ gravity which shows the transition from decelerating in the past to acceleration at present by considering a particular functional form of $ f(Q) $ gravity as $ f(Q) = ({H_0}^2) (\alpha_1 + \alpha_2 \hskip0.05in log ({H_0^{-2}} Q)) $... |
0810.1684 | Frans Klinkhamer | F.R. Klinkhamer | Lorentz invariance, vacuum energy, and cosmology | Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 6 pages,
LaTeX, 2 eps figures. v4: minor polishing | null | null | KA-TP-26-2008 | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This contribution reviews recent work on a new approach to the cosmological
constant problem, which starts from the macroscopic behavior of a conserved
relativistic microscopic variable q. First, the statics of the vacuum energy
density is discussed and, then, the dynamics in a cosmological context.
| [
{
"created": "Thu, 9 Oct 2008 19:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 2008 18:27:39 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Oct 2008 19:50:37 GMT",
"version": "v3"
},
{
"created": "Tue, 11 Nov 2008 18:55:12 GMT",
"version": "v4"
}
] | 2008-11-11 | [
[
"Klinkhamer",
"F. R.",
""
]
] | This contribution reviews recent work on a new approach to the cosmological constant problem, which starts from the macroscopic behavior of a conserved relativistic microscopic variable q. First, the statics of the vacuum energy density is discussed and, then, the dynamics in a cosmological context. |
gr-qc/0105119 | Kayll Lake | Kayll Lake | The Kretschmann scalar for 5D Vacua | 2 pages. Further information at http://grtensor.phy.queensu.ca/fived/ | null | null | null | gr-qc | null | We present a streamlined calculation of the Kretschmann scalar for 5D Vacua
considered recently by Fukui et al. (gr-qc/0105112).
| [
{
"created": "Wed, 30 May 2001 20:06:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lake",
"Kayll",
""
]
] | We present a streamlined calculation of the Kretschmann scalar for 5D Vacua considered recently by Fukui et al. (gr-qc/0105112). |
gr-qc/0009007 | Chopin Soo | Chopin Soo | Einstein Manifolds, Abelian Instantons, Bundle Reduction, and the
Cosmological Constant | 7 pages, RevTex file | Class.Quant.Grav.18:709-718,2001 | 10.1088/0264-9381/18/4/310 | null | gr-qc hep-th | null | The anti-self-dual projection of the spin connections of certain
four-dimensional Einstein manifolds can be Abelian in nature. These
configurations signify bundle reductions. By a theorem of Kobayashi and Nomizu
such a process is predicated on the existence of a covariantly constant field.
It turns out that even with... | [
{
"created": "Mon, 4 Sep 2000 09:49:34 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Soo",
"Chopin",
""
]
] | The anti-self-dual projection of the spin connections of certain four-dimensional Einstein manifolds can be Abelian in nature. These configurations signify bundle reductions. By a theorem of Kobayashi and Nomizu such a process is predicated on the existence of a covariantly constant field. It turns out that even withou... |
1407.3667 | Christine Gruber | Christine Gruber and Hagen Kleinert | Observed Cosmological Reexpansion in Minimal QFT with Bose and Fermi
Fields | 13 pages, no figures; to be published in Astropart. Phys | Astroparticle Physics, Vol. 61, p. 72-81, 2015 | 10.1016/j.astropartphys.2014.06.012 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we aim at explaining the re-acceleration of the expansion of the
universe, or equivalently, the hierarchy problem, with the help of a simple
field-theoretical model. In particular, we want to account for the notorious
discrepancy between the observed value of the cosmological expansion term and
theoretic... | [
{
"created": "Mon, 14 Jul 2014 14:24:41 GMT",
"version": "v1"
}
] | 2014-08-13 | [
[
"Gruber",
"Christine",
""
],
[
"Kleinert",
"Hagen",
""
]
] | In this work we aim at explaining the re-acceleration of the expansion of the universe, or equivalently, the hierarchy problem, with the help of a simple field-theoretical model. In particular, we want to account for the notorious discrepancy between the observed value of the cosmological expansion term and theoretical... |
1604.07636 | Sujay Kr. Biswas | Sujay Kr. Biswas, Wompherdeiki Khyllep, Jibitesh Dutta, and Subenoy
Chakraborty | Dynamical analysis of interacting dark energy model in the framework of
particle creation mechanism | 19 pages, 10 figures; version accepted for publication in Physical
Review D | Phys. Rev. D 95, 103009 (2017) | 10.1103/PhysRevD.95.103009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present the cosmological dynamics of interacting dark energy
models in the framework of particle creation mechanism. The particle creation
mechanism presented here describes the true non equilibrium thermodynamics of
the universe. In spatially flat Friedmann-Lema{\^\i}tre-Robertson-Walker
universe con... | [
{
"created": "Fri, 22 Apr 2016 18:21:25 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Dec 2016 23:42:35 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Mar 2017 17:51:01 GMT",
"version": "v3"
},
{
"created": "Sun, 30 Apr 2017 09:34:33 GMT",
"version": "v4"
}
] | 2017-06-07 | [
[
"Biswas",
"Sujay Kr.",
""
],
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Dutta",
"Jibitesh",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this work we present the cosmological dynamics of interacting dark energy models in the framework of particle creation mechanism. The particle creation mechanism presented here describes the true non equilibrium thermodynamics of the universe. In spatially flat Friedmann-Lema{\^\i}tre-Robertson-Walker universe consi... |
gr-qc/9710001 | Matt Visser | Matt Visser (Washington University) and David Hochberg (LAEFF, Madrid) | Geometric wormhole throats | 47 pages; plain LaTeX; uses epsf.sty (nine encapsulated postscript
figures). To appear in the proceedings of the Haifa Workshop: The Internal
Structure of Black Holes and Spacetime Singularities. (Haifa, Israel,
June-July 1997) [Minor changes in the use of references.] | Annals of the Israel Physical Society 13 (1997) 249-295 | null | null | gr-qc | null | Wormholes and black holes have traditionally been treated a quite separate
objects with relatively little overlap. The possibility of a connection arises
in that wormholes, if they exist, might have profound influence on black holes,
their event horizons, and their internal structure. After discussing some
connection... | [
{
"created": "Wed, 1 Oct 1997 02:52:01 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Oct 1997 02:57:08 GMT",
"version": "v2"
}
] | 2013-08-27 | [
[
"Visser",
"Matt",
"",
"Washington University"
],
[
"Hochberg",
"David",
"",
"LAEFF, Madrid"
]
] | Wormholes and black holes have traditionally been treated a quite separate objects with relatively little overlap. The possibility of a connection arises in that wormholes, if they exist, might have profound influence on black holes, their event horizons, and their internal structure. After discussing some connections,... |
1507.05026 | Elizabeth Winstanley | Cormac Breen, Matthew Hewitt, Adrian C. Ottewill and Elizabeth
Winstanley | Vacuum polarization on the brane | 17 pages, 4 figures, minor changes, accepted for publication in
Physical Review D | Phys. Rev. D 92, 084039 (2015) | 10.1103/PhysRevD.92.084039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the renormalized expectation value of the square of a massless,
conformally coupled, quantum scalar field on the brane of a higher-dimensional
black hole. Working in the AADD brane-world scenario, the extra dimensions are
flat and we assume that the compactification radius is large compared with the
size o... | [
{
"created": "Fri, 17 Jul 2015 16:36:06 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2015 17:55:54 GMT",
"version": "v2"
}
] | 2015-10-28 | [
[
"Breen",
"Cormac",
""
],
[
"Hewitt",
"Matthew",
""
],
[
"Ottewill",
"Adrian C.",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | We compute the renormalized expectation value of the square of a massless, conformally coupled, quantum scalar field on the brane of a higher-dimensional black hole. Working in the AADD brane-world scenario, the extra dimensions are flat and we assume that the compactification radius is large compared with the size of ... |
0705.3623 | Dr. Anirudh Pradhan | Anirudh Pradhan, S. K. Singh and L. J. S. Yadav | String Cosmological Model in Cylindrically Symmetric Inhomogeneous
Universe with Electromagnetic Field II | 12 pages, no figure. Submitted to Rom. Rep. Phys. arXiv admin note:
substantial text overlap with arXiv:0705.0904 | Rom.Rep.Phys.60:1013,2008 | null | null | gr-qc | null | Cylindrically symmetric inhomogeneous string cosmological model of the
universe in presence of electromagnetic field is investigated. We have assumed
that F_{12} is the only non-vanishing component of electromagnetic field tensor
F_{ij}. The Maxwell's equations show that F_{12} is the function of $x$ alone
whereas th... | [
{
"created": "Thu, 24 May 2007 17:10:45 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Jul 2007 07:22:42 GMT",
"version": "v2"
}
] | 2014-05-06 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Singh",
"S. K.",
""
],
[
"Yadav",
"L. J. S.",
""
]
] | Cylindrically symmetric inhomogeneous string cosmological model of the universe in presence of electromagnetic field is investigated. We have assumed that F_{12} is the only non-vanishing component of electromagnetic field tensor F_{ij}. The Maxwell's equations show that F_{12} is the function of $x$ alone whereas the ... |
gr-qc/0610062 | Raymond Burston | Raymond Burston and Anthony Lun | Electromagnetic perturbations of non-vacuum locally rotationally
symmetric class II spacetimes | 15 pages, submitted to Classical and Quantum Gravity | null | null | null | gr-qc | null | We present a method that yields three decoupled covariant equations for three
complex scalars, which completely govern electromagnetic perturbations of
non-vacuum, locally rotationally symmetric class II spacetimes. One of these
equations is equivalent to the previously established generalized Regge-Wheeler
equation ... | [
{
"created": "Thu, 12 Oct 2006 00:37:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burston",
"Raymond",
""
],
[
"Lun",
"Anthony",
""
]
] | We present a method that yields three decoupled covariant equations for three complex scalars, which completely govern electromagnetic perturbations of non-vacuum, locally rotationally symmetric class II spacetimes. One of these equations is equivalent to the previously established generalized Regge-Wheeler equation fo... |
gr-qc/0009011 | Renaud Parentani | R. Parentani | Quantum metric fluctuations and Hawking radiation | 4 pages, revtex | Phys.Rev.D63:041503,2001 | 10.1103/PhysRevD.63.041503 | null | gr-qc | null | In this Letter we study the gravitational interactions between outgoing
configurations giving rise to Hawking radiation and in-falling configurations.
When the latter are in their ground state, the near horizon interactions lead
to collective effects which express themselves as metric fluctuations and which
induce di... | [
{
"created": "Tue, 5 Sep 2000 09:36:49 GMT",
"version": "v1"
}
] | 2009-12-31 | [
[
"Parentani",
"R.",
""
]
] | In this Letter we study the gravitational interactions between outgoing configurations giving rise to Hawking radiation and in-falling configurations. When the latter are in their ground state, the near horizon interactions lead to collective effects which express themselves as metric fluctuations and which induce diss... |
gr-qc/9709038 | Douglas N. Arnold | Douglas N. Arnold (Penn State University), Arup Mukherjee (Rutgers
University), Luc Pouly (ELCA Informatique) | Adaptive Finite Elements and Colliding Black Holes | 15 pages, 6 figures, to be published in "Numerical Analysis 1997:
Proceedings of the 17th Biennial Conference on Numerical Analysis" | null | null | null | gr-qc | null | According to the theory of general relativity, the relative acceleration of
masses generates gravitational radiation. Although gravitational radiation has
not yet been detected, it is believed that extremely violent cosmic events,
such as the collision of black holes, should generate gravity waves of
sufficient ampli... | [
{
"created": "Mon, 15 Sep 1997 13:55:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arnold",
"Douglas N.",
"",
"Penn State University"
],
[
"Mukherjee",
"Arup",
"",
"Rutgers\n University"
],
[
"Pouly",
"Luc",
"",
"ELCA Informatique"
]
] | According to the theory of general relativity, the relative acceleration of masses generates gravitational radiation. Although gravitational radiation has not yet been detected, it is believed that extremely violent cosmic events, such as the collision of black holes, should generate gravity waves of sufficient amplitu... |
1806.06385 | Rocco D'Agostino | Salvatore Capozziello, Rocco D'Agostino, Orlando Luongo | Kinematic model-independent reconstruction of Palatini $f(R)$ cosmology | 10 pages, 6 figures. Accepted for publication in Gen. Rel. Grav | null | 10.1007/s10714-018-2483-0 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A kinematic treatment to trace out the form of $f(R)$ cosmology, within the
Palatini formalism, is discussed by only postulating the universe homogeneity
and isotropy. To figure this out we build model-independent approximations of
the luminosity distance through rational expansions. These approximants extend
the Tay... | [
{
"created": "Sun, 17 Jun 2018 13:49:33 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2018 09:39:39 GMT",
"version": "v2"
}
] | 2019-01-07 | [
[
"Capozziello",
"Salvatore",
""
],
[
"D'Agostino",
"Rocco",
""
],
[
"Luongo",
"Orlando",
""
]
] | A kinematic treatment to trace out the form of $f(R)$ cosmology, within the Palatini formalism, is discussed by only postulating the universe homogeneity and isotropy. To figure this out we build model-independent approximations of the luminosity distance through rational expansions. These approximants extend the Taylo... |
0709.1624 | Terry Pilling | Terry Pilling | Black Hole Thermodynamics and the Factor of 2 Problem | 4 pages | Phys.Lett.B660:402-406,2008 | 10.1016/j.physletb.2008.01.015 | null | gr-qc astro-ph hep-th | null | We show that the recent tunneling formulas for black hole radiation in
static, spherically symmetric spacetimes follow as a consequence of the first
law of black hole thermodynamics and the area-entropy relation based on the
radiation temperature. A tunneling formula results even if the radiation
temperature is diffe... | [
{
"created": "Tue, 11 Sep 2007 13:36:42 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2007 19:21:11 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Nov 2007 19:30:06 GMT",
"version": "v3"
},
{
"created": "Tue, 22 Jan 2008 21:02:59 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Pilling",
"Terry",
""
]
] | We show that the recent tunneling formulas for black hole radiation in static, spherically symmetric spacetimes follow as a consequence of the first law of black hole thermodynamics and the area-entropy relation based on the radiation temperature. A tunneling formula results even if the radiation temperature is differe... |
2002.00890 | Nora Breton | Pedro Ca\~nate, Daniela Magos and Nora Breton | Non-linear electrodynamics generalization of the rotating BTZ black hole | 24 pages, 8 figures | Phys. Rev. D 101, 064010 (2020) | 10.1103/PhysRevD.101.064010 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain two exact solutions of Einstein gravity coupled to nonlinear
electrodynamics (NLED) in $(2+ 1)$-dimensional Anti-de Sitter (AdS) spacetime.
The solutions are characterized by the mass $M$, angular momentum $J$,
cosmological constant or (anti) de Sitter parameter $\Lambda$, and an
electromagnetic parameter $... | [
{
"created": "Mon, 3 Feb 2020 17:03:14 GMT",
"version": "v1"
}
] | 2020-03-11 | [
[
"Cañate",
"Pedro",
""
],
[
"Magos",
"Daniela",
""
],
[
"Breton",
"Nora",
""
]
] | We obtain two exact solutions of Einstein gravity coupled to nonlinear electrodynamics (NLED) in $(2+ 1)$-dimensional Anti-de Sitter (AdS) spacetime. The solutions are characterized by the mass $M$, angular momentum $J$, cosmological constant or (anti) de Sitter parameter $\Lambda$, and an electromagnetic parameter $Q$... |
2111.08237 | Kangjae Lee | Kangjae Lee, Tetsuya Shiromizu, Keisuke Izumi | Refined inequalities for loosely trapped surface/attractive gravity
probe surface | 12 pages | null | 10.1103/PhysRevD.105.044037 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine a loosely trapped surface (LTS) proposed as an indicator for
strong gravity and an attractive gravity probe surface (AGPS) as that for
gravity. Refined inequalities for them are derived by taking account of angular
momentum, gravitational waves and matters.
| [
{
"created": "Tue, 16 Nov 2021 05:38:37 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Lee",
"Kangjae",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Izumi",
"Keisuke",
""
]
] | We reexamine a loosely trapped surface (LTS) proposed as an indicator for strong gravity and an attractive gravity probe surface (AGPS) as that for gravity. Refined inequalities for them are derived by taking account of angular momentum, gravitational waves and matters. |
2105.14379 | Elena Giorgi | Elena Giorgi | The Carter tensor and the physical-space analysis in perturbations of
Kerr-Newman spacetime | 53 pages, 1 figure | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Carter tensor is a Killing tensor of the Kerr-Newman spacetime, and its
existence implies the separability of the wave equation. Nevertheless, the
Carter operator is known to commute with the D'Alembertian only in the case of
a Ricci-flat metric. We show that, even though the Kerr-Newman spacetime
satisfies the n... | [
{
"created": "Sat, 29 May 2021 21:49:15 GMT",
"version": "v1"
}
] | 2021-06-01 | [
[
"Giorgi",
"Elena",
""
]
] | The Carter tensor is a Killing tensor of the Kerr-Newman spacetime, and its existence implies the separability of the wave equation. Nevertheless, the Carter operator is known to commute with the D'Alembertian only in the case of a Ricci-flat metric. We show that, even though the Kerr-Newman spacetime satisfies the non... |
0807.4031 | Masaru Siino | Masaru Siino and Daisuke Ida | Half period theorem of binary black holes | 9pages, 8figures added., A significant error is corrected., The
article has been revised to clarify its insistence | Prog.Theor.Phys.122:1015-1025,2010 | 10.1143/PTP.122.1015 | null | gr-qc | http://creativecommons.org/licenses/publicdomain/ | Merging event horizons of the binary black holes is investigated. While
recent development of the numerical study of the binary black hole coalescence
has shown that their apparent horizons can orbit for many periods, we study the
orbital motion of the event horizon. We discuss how many periods their event
horizons o... | [
{
"created": "Fri, 25 Jul 2008 08:51:02 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Nov 2008 12:36:08 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jun 2009 10:36:03 GMT",
"version": "v3"
}
] | 2010-01-15 | [
[
"Siino",
"Masaru",
""
],
[
"Ida",
"Daisuke",
""
]
] | Merging event horizons of the binary black holes is investigated. While recent development of the numerical study of the binary black hole coalescence has shown that their apparent horizons can orbit for many periods, we study the orbital motion of the event horizon. We discuss how many periods their event horizons orb... |
gr-qc/0401109 | Jose A. Zapata | Jos\'e A. Zapata | Loop quantization from a lattice gauge theory perspective | 11 pages, no figures; completely rewritten | Class.Quant.Grav. 21 (2004) L115-L122 | 10.1088/0264-9381/21/17/L01 | null | gr-qc hep-th | null | We present an interpretation of loop quantization in the framework of lattice
gauge theory. Within this context the lack of appropriate notions of effective
theories and renormalization group flow exhibit loop quantization as an
incomplete framework. This interpretation includes a construction of embedded
spin foam m... | [
{
"created": "Tue, 27 Jan 2004 20:24:14 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jan 2004 16:56:54 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Sep 2004 17:16:25 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Zapata",
"José A.",
""
]
] | We present an interpretation of loop quantization in the framework of lattice gauge theory. Within this context the lack of appropriate notions of effective theories and renormalization group flow exhibit loop quantization as an incomplete framework. This interpretation includes a construction of embedded spin foam mod... |
gr-qc/9903059 | Filipe Bonjour | Filipe Bonjour, Christos Charmousis and Ruth Gregory | Thick self-gravitating plane-symmetric domain walls | 10 pages, 9 eps files, talk given at Les Houches '99 Winter School | null | null | null | gr-qc | null | We investigate a self-gravitating thick domain wall for a $\lambda \Phi^4$
potential. The system of scalar and Einstein equations admits two types of
non-trivial solutions: domain wall solutions and false vacuum-de Sitter
solutions. The existence and stability of these solutions depends on the
strength of the gravita... | [
{
"created": "Mon, 15 Mar 1999 15:12:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bonjour",
"Filipe",
""
],
[
"Charmousis",
"Christos",
""
],
[
"Gregory",
"Ruth",
""
]
] | We investigate a self-gravitating thick domain wall for a $\lambda \Phi^4$ potential. The system of scalar and Einstein equations admits two types of non-trivial solutions: domain wall solutions and false vacuum-de Sitter solutions. The existence and stability of these solutions depends on the strength of the gravitati... |
gr-qc/9709047 | Adam Helfer | Adam D. Helfer | `Operational' Energy Conditions | 18 pages, plain Tex, IOP macros. Expanded treatment of measurement
problems for space-time, with implications for Cosmic Censorship as an
example. Accepted by Classical and Quantum Gravity | null | 10.1088/0264-9381/15/5/008 | null | gr-qc quant-ph | null | I show that a quantized Klein-Gordon field in Minkowski space obeys an
`operational' weak energy condition: the energy of an isolated device
constructed to measure or trap the energy in a region, plus the energy it
measures or traps, cannot be negative. There are good reasons for thinking that
similar results hold lo... | [
{
"created": "Thu, 18 Sep 1997 16:18:34 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 1998 22:41:21 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Helfer",
"Adam D.",
""
]
] | I show that a quantized Klein-Gordon field in Minkowski space obeys an `operational' weak energy condition: the energy of an isolated device constructed to measure or trap the energy in a region, plus the energy it measures or traps, cannot be negative. There are good reasons for thinking that similar results hold loca... |
gr-qc/0404071 | Simonetta Frittelli | Simonetta Frittelli (Duquesne University) | Potential for ill-posedness in several 2nd-order formulations of the
Einstein equations | v1:6 pages; v2:7 pages, discussion extended, to appear in Phys. Rev.
D; v3: typos corrected, published version | Phys.Rev. D70 (2004) 044029 | 10.1103/PhysRevD.70.044029 | null | gr-qc | null | Second-order formulations of the 3+1 Einstein equations obtained by
eliminating the extrinsic curvature in terms of the time derivative of the
metric are examined with the aim of establishing whether they are well posed,
in cases of somewhat wide interest, such as ADM, BSSN and generalized
Einstein-Christoffel. The c... | [
{
"created": "Fri, 16 Apr 2004 14:11:07 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2004 13:56:48 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jul 2004 16:57:20 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Frittelli",
"Simonetta",
"",
"Duquesne University"
]
] | Second-order formulations of the 3+1 Einstein equations obtained by eliminating the extrinsic curvature in terms of the time derivative of the metric are examined with the aim of establishing whether they are well posed, in cases of somewhat wide interest, such as ADM, BSSN and generalized Einstein-Christoffel. The cri... |
1907.00728 | Dr. Goutam Manna | Goutam Manna and Bivash Majumder | The Hawking temperature in the context of dark energy for Kerr-Newman
and Kerr-Newman-AdS backgrounds | 8pages, Accepted. arXiv admin note: text overlap with arXiv:1303.2999 | The European Physical Journal C-2019 | 10.1140/epjc/s10052-019-7066-z | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that the Hawking temperature is modified in the presence of dark
energy in an emergent gravity scenario for Kerr-Newman(KN) and
Kerr-Newman-AdS(KNAdS) background metrics. The emergent gravity metric is not
conformally equivalent to the gravitational metric. We calculate the Hawking
temperatures for these emer... | [
{
"created": "Tue, 25 Jun 2019 18:09:53 GMT",
"version": "v1"
}
] | 2019-07-03 | [
[
"Manna",
"Goutam",
""
],
[
"Majumder",
"Bivash",
""
]
] | We show that the Hawking temperature is modified in the presence of dark energy in an emergent gravity scenario for Kerr-Newman(KN) and Kerr-Newman-AdS(KNAdS) background metrics. The emergent gravity metric is not conformally equivalent to the gravitational metric. We calculate the Hawking temperatures for these emerge... |
gr-qc/0310100 | Nina Jansen | Nina Jansen, Bernd Bruegmann, Wolfgang Tichy | Numerical stability of the AA evolution system compared to the ADM and
BSSN systems | 16 pages, 12 figures | Phys.Rev.D74:084022,2006 | 10.1103/PhysRevD.74.084022 | CGPG-03/8-1 | gr-qc | null | We explore the numerical stability properties of an evolution system
suggested by Alekseenko and Arnold. We examine its behavior on a set of
standardized testbeds, and we evolve a single black hole with different gauges.
Based on a comparison with two other evolution systems with well-known
properties, we discuss som... | [
{
"created": "Mon, 20 Oct 2003 21:19:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jansen",
"Nina",
""
],
[
"Bruegmann",
"Bernd",
""
],
[
"Tichy",
"Wolfgang",
""
]
] | We explore the numerical stability properties of an evolution system suggested by Alekseenko and Arnold. We examine its behavior on a set of standardized testbeds, and we evolve a single black hole with different gauges. Based on a comparison with two other evolution systems with well-known properties, we discuss some ... |
1705.02504 | Dawood Kothawala Dr. | Dawood Kothawala | Action and Observer dependence in Euclidean quantum gravity | v2: discussions and references added; to appear in CQG Letters | Class. Quantum Grav. 35 03LT01 (2018) | 10.1088/1361-6382/aa9fdf | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a Lorentzian spacetime $(M, g)$ and a non-vanishing timelike vector
field $u(\lambda)$ with level surfaces $\Sigma$, one can construct on $M$ a
Euclidean metric $g_E^{ab} = g^{ab} + 2 u^a u^b$. Motivated by this, we
consider a class of metrics $\hat{g}^{ab} = g^{ab} - \Theta(\lambda)\, u^a u^b$
with an arbitrar... | [
{
"created": "Sat, 6 May 2017 16:42:33 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2017 08:28:22 GMT",
"version": "v2"
}
] | 2018-01-16 | [
[
"Kothawala",
"Dawood",
""
]
] | Given a Lorentzian spacetime $(M, g)$ and a non-vanishing timelike vector field $u(\lambda)$ with level surfaces $\Sigma$, one can construct on $M$ a Euclidean metric $g_E^{ab} = g^{ab} + 2 u^a u^b$. Motivated by this, we consider a class of metrics $\hat{g}^{ab} = g^{ab} - \Theta(\lambda)\, u^a u^b$ with an arbitrary ... |
2405.08071 | Marcello Miranda | Marcello Miranda | Covariant single-field formulation of effective cosmological bounces | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study explores the feasibility of an effective Friedmann equation in
removing the classical initial Big Bang singularity, replaced by a bounce
occurring at a critical energy density value. In a spatially flat, homogeneous,
and isotropic universe, the effective theory is obtained by introducing a
function paramet... | [
{
"created": "Mon, 13 May 2024 18:00:02 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Miranda",
"Marcello",
""
]
] | This study explores the feasibility of an effective Friedmann equation in removing the classical initial Big Bang singularity, replaced by a bounce occurring at a critical energy density value. In a spatially flat, homogeneous, and isotropic universe, the effective theory is obtained by introducing a function parametri... |
gr-qc/0303014 | Jonn Miritzis | John Miritzis | Scalar-field cosmologies with an arbitrary potential | 15 pages | Class.Quant.Grav. 20 (2003) 2981-2990 | 10.1088/0264-9381/20/14/301 | null | gr-qc | null | We study the late time evolution of flat and negatively curved FRW models
with a perfect fluid matter source and a scalar field having an arbitrary
non-negative potential function $V(\phi) .$ We prove using a dynamical systems
approach four general results for a large class of non-negative potentials
which show that ... | [
{
"created": "Tue, 4 Mar 2003 09:41:21 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Miritzis",
"John",
""
]
] | We study the late time evolution of flat and negatively curved FRW models with a perfect fluid matter source and a scalar field having an arbitrary non-negative potential function $V(\phi) .$ We prove using a dynamical systems approach four general results for a large class of non-negative potentials which show that al... |
2006.14016 | Yeinzon Rodriguez Garcia | J. Bayron Orjuela-Quintana (1), Miguel Alvarez (2), Cesar A.
Valenzuela-Toledo (1), Yeinzon Rodriguez (2,3,4) ((1) Universidad del Valle,
(2) Universidad Industrial de Santander, (3) Universidad Antonio Narino, (4)
The Abdus Salam International Centre for Theoretical Physics) | Anisotropic Einstein Yang-Mills Higgs Dark Energy | LaTeX file in RevTeX 4.1 style, 13 pages, 19 figures. v2: cosmetic
changes and references added. Version to appear in Journal of Cosmology and
Astroparticle Physics | JCAP 2010: 019, 2020 | 10.1088/1475-7516/2020/10/019 | PI/UAN-2020-675FT | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the dark energy scenario, the Einstein Yang-Mills Higgs
model in the SO(3) representation was studied for the first time by M. Rinaldi
(see JCAP 1510, 023 (2015)) in a homogeneous and isotropic spacetime. We
revisit this model, finding in particular that the interaction between the
Higgs field and t... | [
{
"created": "Wed, 24 Jun 2020 19:41:15 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2020 17:04:37 GMT",
"version": "v2"
}
] | 2020-10-08 | [
[
"Orjuela-Quintana",
"J. Bayron",
""
],
[
"Alvarez",
"Miguel",
""
],
[
"Valenzuela-Toledo",
"Cesar A.",
""
],
[
"Rodriguez",
"Yeinzon",
""
]
] | In the context of the dark energy scenario, the Einstein Yang-Mills Higgs model in the SO(3) representation was studied for the first time by M. Rinaldi (see JCAP 1510, 023 (2015)) in a homogeneous and isotropic spacetime. We revisit this model, finding in particular that the interaction between the Higgs field and the... |
0707.3318 | Giampiero Esposito Dr. | Elisabetta Di Grezia, Giampiero Esposito, Gennaro Miele | Black hole evaporation in a spherically symmetric non-commutative
space-time | 8 pages, Latex file with IOP macros, prepared for the QFEXT07
Conference, Leipzig, September 2007 | J.Phys.A41:164063,2008 | 10.1088/1751-8113/41/16/164063 | DSF 2007/25 | gr-qc | null | Recent work in the literature has studied the quantum-mechanical decay of a
Schwarzschild-like black hole, formed by gravitational collapse, into
almost-flat space-time and weak radiation at a very late time. The relevant
quantum amplitudes have been evaluated for bosonic and fermionic fields,
showing that no informa... | [
{
"created": "Mon, 23 Jul 2007 06:34:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Di Grezia",
"Elisabetta",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Miele",
"Gennaro",
""
]
] | Recent work in the literature has studied the quantum-mechanical decay of a Schwarzschild-like black hole, formed by gravitational collapse, into almost-flat space-time and weak radiation at a very late time. The relevant quantum amplitudes have been evaluated for bosonic and fermionic fields, showing that no informati... |
gr-qc/0507034 | Peng Wang | Peng Wang | Horizon Entropy in Modified Gravity | 8 pages. v2: references added | Phys.Rev.D72:024030,2005 | 10.1103/PhysRevD.72.024030 | null | gr-qc | null | We present an observation about the proposal that four-dimensional
modification of general relativity may explain the observed cosmic acceleration
today. Assuming that the thermodynamical nature of gravity theory continues to
hold in modified gravity theories, we derive the modified horizon entropy
formula from the m... | [
{
"created": "Fri, 8 Jul 2005 05:58:00 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jul 2005 10:41:29 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Wang",
"Peng",
""
]
] | We present an observation about the proposal that four-dimensional modification of general relativity may explain the observed cosmic acceleration today. Assuming that the thermodynamical nature of gravity theory continues to hold in modified gravity theories, we derive the modified horizon entropy formula from the mod... |
0803.0867 | Daniel Sunhede | Kimmo Kainulainen, Daniel Sunhede | On the stability of spherically symmetric spacetimes in metric f(R)
gravity | Published version, 9 pages, 3 figures | Phys.Rev.D78:063511,2008 | 10.1103/PhysRevD.78.063511 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider stability properties of spherically symmetric spacetimes of stars
in metric f(R) gravity. We stress that these not only depend on the particular
model, but also on the specific physical configuration. Typically
configurations giving the desired $\gamma_{\rm PPN} \approx 1$ are strongly
constrained, while ... | [
{
"created": "Thu, 6 Mar 2008 13:56:18 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Mar 2008 09:25:10 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Sep 2008 13:35:15 GMT",
"version": "v3"
}
] | 2008-12-18 | [
[
"Kainulainen",
"Kimmo",
""
],
[
"Sunhede",
"Daniel",
""
]
] | We consider stability properties of spherically symmetric spacetimes of stars in metric f(R) gravity. We stress that these not only depend on the particular model, but also on the specific physical configuration. Typically configurations giving the desired $\gamma_{\rm PPN} \approx 1$ are strongly constrained, while th... |
0809.2634 | Masakatsu Kenmoku | Masakatsu Kenmoku | Normal Modes, Quasi-normal Modes and Super-radiant Modes for Scalar
Fields in Kerr anti-de Sitter Spacetime | 19 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Normal modes, quasi-normal modes and super-radiant modes are studied to
clarify the total dynamics for complex scalar fields in Kerr anti-de Sitter
black hole spacetime. Orthonormal relations and quasi-orthonormal relations are
obtained for normal modes and quasi-normal modes. Mode expansions are done and
the conserv... | [
{
"created": "Tue, 16 Sep 2008 03:04:59 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2008 07:46:35 GMT",
"version": "v2"
},
{
"created": "Wed, 6 May 2009 08:12:44 GMT",
"version": "v3"
}
] | 2009-05-06 | [
[
"Kenmoku",
"Masakatsu",
""
]
] | Normal modes, quasi-normal modes and super-radiant modes are studied to clarify the total dynamics for complex scalar fields in Kerr anti-de Sitter black hole spacetime. Orthonormal relations and quasi-orthonormal relations are obtained for normal modes and quasi-normal modes. Mode expansions are done and the conserved... |
gr-qc/0506099 | Mohammad Vahid Takook | Ali Pahlavan, Shahriar Rouhani, Mohammad Vahid Takook | N=1 de Sitter Supersymmetry Algebra | 8 pages, LaTeX, some details added | Phys.Lett. B627 (2005) 217-223 | 10.1016/j.physletb.2005.08.109 | null | gr-qc | null | Recalling the universal covering group of de Sitter, the transformation
properties of the spinor fields $\psi(x)$ and ${\bar\psi}(x)$, in the ambient
space notation, are presented in this paper. The charge conjugation symmetry of
the de Sitter spinor field is then discussed in the above notation. Using this
spinor fi... | [
{
"created": "Sun, 19 Jun 2005 12:07:44 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Oct 2005 16:11:17 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Pahlavan",
"Ali",
""
],
[
"Rouhani",
"Shahriar",
""
],
[
"Takook",
"Mohammad Vahid",
""
]
] | Recalling the universal covering group of de Sitter, the transformation properties of the spinor fields $\psi(x)$ and ${\bar\psi}(x)$, in the ambient space notation, are presented in this paper. The charge conjugation symmetry of the de Sitter spinor field is then discussed in the above notation. Using this spinor fiel... |
2108.13017 | Norichika Sago | Norichika Sago, Soichiro Isoyama, Hiroyuki Nakano | Fundamental Tone and Overtones of Quasinormal Modes in Ringdown
Gravitational Waves: A Detailed Study in Black Hole Perturbation | 30 pages, 14 figures, accepted version | Universe 2021, 7(10), 357 | 10.3390/universe7100357 | KUNS-2892, OCU-PHYS-547, AP-GR-172 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ringdown gravitational waves of compact object binaries observed by
ground-based gravitational-wave detectors encapsulate rich information to
understand remnant objects after the merger and to test general relativity in
the strong field. In this work, we investigate the ringdown gravitational waves
in detail to bette... | [
{
"created": "Mon, 30 Aug 2021 06:50:30 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2021 00:42:27 GMT",
"version": "v2"
}
] | 2021-09-29 | [
[
"Sago",
"Norichika",
""
],
[
"Isoyama",
"Soichiro",
""
],
[
"Nakano",
"Hiroyuki",
""
]
] | Ringdown gravitational waves of compact object binaries observed by ground-based gravitational-wave detectors encapsulate rich information to understand remnant objects after the merger and to test general relativity in the strong field. In this work, we investigate the ringdown gravitational waves in detail to better ... |
2305.10144 | Snehasish Bhattacharjee | Snehasish Bhattacharjee | White dwarf cooling in $f(R,T)$ gravity | null | International Journal of Modern Physics A, 39, 05n06, 2450026
(2024) | 10.1142/S0217751X2450026X | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | In recent times, astounding observations of both over- and under-luminous
type Ia supernovae have emerged. These peculiar observations hint not only at
surpassing the Chandrasekhar limit but may also suggest potential modifications
in the physical attributes of their progenitors, such as their cooling rate.
This, in ... | [
{
"created": "Wed, 17 May 2023 11:57:11 GMT",
"version": "v1"
}
] | 2024-05-16 | [
[
"Bhattacharjee",
"Snehasish",
""
]
] | In recent times, astounding observations of both over- and under-luminous type Ia supernovae have emerged. These peculiar observations hint not only at surpassing the Chandrasekhar limit but may also suggest potential modifications in the physical attributes of their progenitors, such as their cooling rate. This, in tu... |
gr-qc/0210042 | Michael Hartl | Michael D. Hartl | Dynamics of spinning test particles in Kerr spacetime | 21 pages; published as Phys. Rev. D 67, 024005 (2003) | Phys.Rev. D67 (2003) 024005 | 10.1103/PhysRevD.67.024005 | null | gr-qc | null | We investigate the dynamics of relativistic spinning test particles in the
spacetime of a rotating black hole using the Papapetrou equations. We use the
method of Lyapunov exponents to determine whether the orbits exhibit sensitive
dependence on initial conditions, a signature of chaos. In the case of
maximally spinn... | [
{
"created": "Mon, 14 Oct 2002 22:55:35 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2002 04:01:40 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Oct 2002 17:55:45 GMT",
"version": "v3"
},
{
"created": "Thu, 31 Oct 2002 20:50:41 GMT",
"version": "v4"
},
{
"c... | 2009-11-07 | [
[
"Hartl",
"Michael D.",
""
]
] | We investigate the dynamics of relativistic spinning test particles in the spacetime of a rotating black hole using the Papapetrou equations. We use the method of Lyapunov exponents to determine whether the orbits exhibit sensitive dependence on initial conditions, a signature of chaos. In the case of maximally spinnin... |
2210.16245 | Da-Ming Chen | Da-Ming Chen | Torsion fields generated by the quantum effects of macro-bodies | 21 pages, some missing symbols added and the errors in grammar
corrected | Res. Astron. Astrophys. 22(2022) 125019 | 10.1088/1674-4527/ac9aef | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We generalize Einstein's General Relativity (GR) by assuming that all matter
(including macro-objects) has quantum effects. An appropriate theory to fulfill
this task is Gauge Theory Gravity (GTG) developed by the Cambridge group. GTG
is a ``spin-torsion" theory, according to which, gravitational effects are
describe... | [
{
"created": "Fri, 28 Oct 2022 16:24:25 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2022 16:12:11 GMT",
"version": "v2"
}
] | 2022-12-14 | [
[
"Chen",
"Da-Ming",
""
]
] | We generalize Einstein's General Relativity (GR) by assuming that all matter (including macro-objects) has quantum effects. An appropriate theory to fulfill this task is Gauge Theory Gravity (GTG) developed by the Cambridge group. GTG is a ``spin-torsion" theory, according to which, gravitational effects are described ... |
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