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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0011008 | Sarah Beryl Melisande Bell | Sarah B. M. Bell, John P. Cullerne and Bernard M. Diaz (Department of
Computer Science I. Q. Group, University of Liverpool, United Kingdom) | A new approach to quantum gravity: a summary | This paper has been superceded by quant-ph/0104017, quant-ph/0104018,
quant-ph/0110162 and physics/0211108. 21 pages. Proceedings Physical
Interpretations of Relativity Theory VII, British Society for the Philosophy
of Science, S.C.E.T., University of Sunderland, at Imperial College, London,
September 15-18 (20... | null | null | null | gr-qc | null | Quantum Electrodynamics (QED) has been so successful a theory that it is
taken as a model for the production of further quantum theories. However, when
the prescription for quantising electromagnetic interactions that so
successfully resulted in QED is applied to General Relativity the theory
obtained is not renormal... | [
{
"created": "Fri, 3 Nov 2000 12:05:02 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Nov 2001 18:06:43 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Nov 2002 20:18:32 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Bell",
"Sarah B. M.",
"",
"Department of\n Computer Science I. Q. Group, University of Liverpool, United Kingdom"
],
[
"Cullerne",
"John P.",
"",
"Department of\n Computer Science I. Q. Group, University of Liverpool, United Kingdom"
],
[
"Diaz",
"Bernard M.",
... | Quantum Electrodynamics (QED) has been so successful a theory that it is taken as a model for the production of further quantum theories. However, when the prescription for quantising electromagnetic interactions that so successfully resulted in QED is applied to General Relativity the theory obtained is not renormaliz... |
2401.00044 | Takahiro Yamamoto S. | Takahiro S. Yamamoto, Ryoto Inui, Yuichiro Tada, Shuichiro Yokoyama | Prospects of detection of subsolar mass primordial black hole and white
dwarf binary mergers | 13 pages, 10 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The subsolar mass primordial black hole (PBH) attracts attention as robust
evidence of its primordial origin against the astrophysical black hole. Not
only with themselves, PBHs can also form binaries with ordinary astrophysical
objects, catching them by gravitational wave (GW) bremsstrahlung. We discuss
the detectab... | [
{
"created": "Fri, 29 Dec 2023 19:00:01 GMT",
"version": "v1"
}
] | 2024-01-03 | [
[
"Yamamoto",
"Takahiro S.",
""
],
[
"Inui",
"Ryoto",
""
],
[
"Tada",
"Yuichiro",
""
],
[
"Yokoyama",
"Shuichiro",
""
]
] | The subsolar mass primordial black hole (PBH) attracts attention as robust evidence of its primordial origin against the astrophysical black hole. Not only with themselves, PBHs can also form binaries with ordinary astrophysical objects, catching them by gravitational wave (GW) bremsstrahlung. We discuss the detectabil... |
2305.07771 | Adam Cie\'slik | Adam Cie\'slik, Eva Hackmann, Patryk Mach | Kerr Geodesics in Terms of Weierstrass Elliptic Functions | 38 pages, 11 figures. Corrected typos in eqs. (C15) and (C19) | null | 10.1103/PhysRevD.108.024056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive novel analytical solutions describing timelike and null geodesics
in the Kerr spacetime. The solutions are parameterized explicitly by constants
of motion -- the energy, the angular momentum, and the Carter constant -- and
initial coordinates. A single set of formulas is valid for all null and
timelike geod... | [
{
"created": "Fri, 12 May 2023 21:29:20 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Oct 2023 21:13:24 GMT",
"version": "v2"
}
] | 2023-10-24 | [
[
"Cieślik",
"Adam",
""
],
[
"Hackmann",
"Eva",
""
],
[
"Mach",
"Patryk",
""
]
] | We derive novel analytical solutions describing timelike and null geodesics in the Kerr spacetime. The solutions are parameterized explicitly by constants of motion -- the energy, the angular momentum, and the Carter constant -- and initial coordinates. A single set of formulas is valid for all null and timelike geodes... |
gr-qc/9703043 | Seth Major | Viqar Husain and Seth Major | Gravity and BF theory defined in bounded regions | References added | Nucl.Phys. B500 (1997) 381-401 | 10.1016/S0550-3213(97)00371-4 | CGPG-97/2-1 | gr-qc hep-th | null | We study Einstein gravity in a finite spatial region. By requiring a
well-defined variational principle, we identify all local boundary conditions,
derive surface observables, and compute their algebra. The observables arise as
induced surface terms, which contribute to a non-vanishing Hamiltonian. Unlike
the asympto... | [
{
"created": "Mon, 17 Mar 1997 22:00:16 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Apr 1997 21:02:25 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Husain",
"Viqar",
""
],
[
"Major",
"Seth",
""
]
] | We study Einstein gravity in a finite spatial region. By requiring a well-defined variational principle, we identify all local boundary conditions, derive surface observables, and compute their algebra. The observables arise as induced surface terms, which contribute to a non-vanishing Hamiltonian. Unlike the asymptoti... |
1005.2276 | Oleg Zaslavskii | Oleg B. Zaslavskii | Static black holes in equilibrium with matter: nonlinear equation of
state | 6 pages. To appear in PRD. | Phys.Rev.D81:107501,2010 | 10.1103/PhysRevD.81.107501 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a spherically symmetric black hole in equilibrium with
surrounding classical matter that is characterized by a nonlinear dependence of
the radial pressure p_{r} on the density {\rho}. We examine under which
requirements such an equilibrium is possible. It is shown that if the radial
and transverse pressur... | [
{
"created": "Thu, 13 May 2010 08:47:16 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Zaslavskii",
"Oleg B.",
""
]
] | We consider a spherically symmetric black hole in equilibrium with surrounding classical matter that is characterized by a nonlinear dependence of the radial pressure p_{r} on the density {\rho}. We examine under which requirements such an equilibrium is possible. It is shown that if the radial and transverse pressures... |
gr-qc/0210058 | Mario Novello | M. Novello and R. P. Neves | The mass of the graviton and the cosmological constant | Title changed and few details added, without any changes in the
conclusion | null | 10.1088/0264-9381/20/6/101 | null | gr-qc hep-th | null | We show that the graviton acquires a mass in a de Sitter background given by
$m_{g}^{2}=-{2/3}\Lambda.$ This is precisely the fine-tuning value required for
the perturbed gravitational field to mantain its two degrees of freedom.
| [
{
"created": "Thu, 17 Oct 2002 17:22:49 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Dec 2002 13:20:02 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Novello",
"M.",
""
],
[
"Neves",
"R. P.",
""
]
] | We show that the graviton acquires a mass in a de Sitter background given by $m_{g}^{2}=-{2/3}\Lambda.$ This is precisely the fine-tuning value required for the perturbed gravitational field to mantain its two degrees of freedom. |
0805.3428 | D. F. Mota | Baojiu Li, David F. Mota and Douglas J. Shaw | Microscopic and Macroscopic Behaviors of Palatini Modified Gravity
Theories | 21 pages | Phys.Rev.D78:064018,2008 | 10.1103/PhysRevD.78.064018 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, within modified gravity, the non-linear nature of the field
equations implies that the usual naive averaging procedure (replacing the
microscopic energy-momentum by its cosmological average) is invalid. We discuss
then how the averaging should be performed correctly and show that, as a
consequence, at c... | [
{
"created": "Thu, 22 May 2008 10:26:52 GMT",
"version": "v1"
},
{
"created": "Fri, 30 May 2008 11:36:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Li",
"Baojiu",
""
],
[
"Mota",
"David F.",
""
],
[
"Shaw",
"Douglas J.",
""
]
] | We show that, within modified gravity, the non-linear nature of the field equations implies that the usual naive averaging procedure (replacing the microscopic energy-momentum by its cosmological average) is invalid. We discuss then how the averaging should be performed correctly and show that, as a consequence, at cla... |
1204.3631 | Josue De-Santiago | Josue De-Santiago, Jorge L. Cervantes-Cota, David Wands | Cosmological phase space analysis of the F (X) - V (phi) scalar field
and bouncing solutions | 13 pages, 11 figures, v3 appendix added in order to match the
published version in Phys. Rev. D | Phys.Rev.D87,023502(2013) | 10.1103/PhysRevD.87.023502 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the dynamical system defined by a universe filled with a
barotropic fluid plus a scalar field with modified kinetic term of the form L =
F (X) - V (phi). After a suitable choice of variables that allows us to study
the phase space of the system we obtain the critical points and their
stability. We find tha... | [
{
"created": "Mon, 16 Apr 2012 20:00:13 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2012 18:57:59 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Feb 2013 04:03:25 GMT",
"version": "v3"
}
] | 2015-03-20 | [
[
"De-Santiago",
"Josue",
""
],
[
"Cervantes-Cota",
"Jorge L.",
""
],
[
"Wands",
"David",
""
]
] | We analyze the dynamical system defined by a universe filled with a barotropic fluid plus a scalar field with modified kinetic term of the form L = F (X) - V (phi). After a suitable choice of variables that allows us to study the phase space of the system we obtain the critical points and their stability. We find that ... |
2101.12228 | Arwa Elhashash | Arwa Elhashash, David A. Nichols | Definitions of (super) angular momentum in asymptotically flat
spacetimes: Properties and applications to compact-binary mergers | 25 pages, 3 figures. V3 includes additional changes to match the
published version | Phys. Rev. D 104, 024020 (2021) | 10.1103/PhysRevD.104.024020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The symmetries of asymptotically flat spacetimes in general relativity are
given by the Bondi-Metzner-Sachs (BMS) group, though there are proposed
generalizations of its symmetry algebra. Associated with each symmetry is a
charge and a flux, and the values of these charges and their changes can
characterize a spaceti... | [
{
"created": "Thu, 28 Jan 2021 19:00:18 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Feb 2021 22:31:23 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Sep 2021 17:06:31 GMT",
"version": "v3"
}
] | 2021-09-28 | [
[
"Elhashash",
"Arwa",
""
],
[
"Nichols",
"David A.",
""
]
] | The symmetries of asymptotically flat spacetimes in general relativity are given by the Bondi-Metzner-Sachs (BMS) group, though there are proposed generalizations of its symmetry algebra. Associated with each symmetry is a charge and a flux, and the values of these charges and their changes can characterize a spacetime... |
2205.12793 | Arun Kenath Dr | Louise Rebecca (1,2), Arun Kenath (2), C Sivaram (3) ((1) Department
of Physics, Christ Junior College, (2) Department of Physics and Electronics,
CHRIST (Deemed to be University), (3) Indian Institute of Astrophysics) | MONG: An extension to galaxy clusters | 9 pages, 2 figures, 21 equations | null | 10.1142/S021773232250078X | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The presence of dark matter, though well established by indirect evidence, is
yet to be observed directly. Various dark matter detection experiments running
for several years have yielded no positive results. In view of these negative
results, we had earlier proposed alternate models by postulating a minimum
gravitat... | [
{
"created": "Wed, 25 May 2022 14:07:47 GMT",
"version": "v1"
}
] | 2022-05-26 | [
[
"Rebecca",
"Louise",
""
],
[
"Kenath",
"Arun",
""
],
[
"Sivaram",
"C",
""
]
] | The presence of dark matter, though well established by indirect evidence, is yet to be observed directly. Various dark matter detection experiments running for several years have yielded no positive results. In view of these negative results, we had earlier proposed alternate models by postulating a minimum gravitatio... |
2406.04813 | Hrishikesh Chakrabarty | Abdybek Urmanov, Hrishikesh Chakrabarty, Daniele Malafarina | Observational properties of Coherent Quantum Black Holes | 9 pages, 7 figures; Comments are welcome | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We consider null and time-like geodesics around a spherically symmetric,
non-rotating Coherent Quantum Black Hole (CQBH). The classical limit of the
geometry of CQBH departs from that of the Schwarzschild spacetime at short
scales and depends on one parameter $R_s$ which can be interpreted as the
physical radius of t... | [
{
"created": "Fri, 7 Jun 2024 10:28:11 GMT",
"version": "v1"
}
] | 2024-06-10 | [
[
"Urmanov",
"Abdybek",
""
],
[
"Chakrabarty",
"Hrishikesh",
""
],
[
"Malafarina",
"Daniele",
""
]
] | We consider null and time-like geodesics around a spherically symmetric, non-rotating Coherent Quantum Black Hole (CQBH). The classical limit of the geometry of CQBH departs from that of the Schwarzschild spacetime at short scales and depends on one parameter $R_s$ which can be interpreted as the physical radius of the... |
gr-qc/9808035 | Gary T. Horowitz | Gary T. Horowitz and Saul A. Teukolsky | Black Holes | 13 pages, To appear in the American Physical Society Centenary issue
of Reviews of Modern Physics, March 1999 | Rev.Mod.Phys.71:S180-S186,1999 | 10.1103/RevModPhys.71.S180 | UCSBTH-98-5 | gr-qc | null | Black holes are among the most intriguing objects in modern physics. Their
influence ranges from powering quasars and other active galactic nuclei, to
providing key insights into quantum gravity. We review the observational
evidence for black holes, and briefly discuss some of their properties. We also
describe some ... | [
{
"created": "Wed, 12 Aug 1998 21:58:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Horowitz",
"Gary T.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | Black holes are among the most intriguing objects in modern physics. Their influence ranges from powering quasars and other active galactic nuclei, to providing key insights into quantum gravity. We review the observational evidence for black holes, and briefly discuss some of their properties. We also describe some re... |
2210.00523 | Reggie Pantig | Reggie C. Pantig and Ali \"Ovg\"un | Black hole in quantum wave dark matter | 19 pages, 9 figures, 2 tables. Finalized version of the paper | Fortschr. Phys. 2023, 71, 2200164 | 10.1002/prop.202200164 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we explored the effect of the fuzzy dark matter (FDM) (or wave
dark matter) halo on a supermassive black hole (SMBH). Such a dark matter
introduces a soliton core density profile, and we treat it ideally as a
spherical distribution that surrounds the SMBH located at its center. In this
direction, we obt... | [
{
"created": "Sun, 2 Oct 2022 14:02:16 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2022 07:54:02 GMT",
"version": "v2"
}
] | 2023-01-31 | [
[
"Pantig",
"Reggie C.",
""
],
[
"Övgün",
"Ali",
""
]
] | In this work, we explored the effect of the fuzzy dark matter (FDM) (or wave dark matter) halo on a supermassive black hole (SMBH). Such a dark matter introduces a soliton core density profile, and we treat it ideally as a spherical distribution that surrounds the SMBH located at its center. In this direction, we obtai... |
1609.07633 | Yen-Kheng Lim | Yen-Kheng Lim and Qing-hai Wang | Exact gravitational lensing in conformal gravity and Schwarzschild-de
Sitter spacetime | 22 pages, 8 figures | Phys. Rev. D 95, 024004 (2017) | 10.1103/PhysRevD.95.024004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact solution is obtained for the gravitational bending of light in
static, spherically symmetric metrics which includes the Schwarzschild-de
Sitter spacetime and also the Mannheim-Kazanas metric of conformal Weyl
gravity. From the exact solution, we obtain a small bending-angle-approximation
for a lens system wh... | [
{
"created": "Sat, 24 Sep 2016 15:03:57 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2017 01:26:19 GMT",
"version": "v2"
}
] | 2017-01-06 | [
[
"Lim",
"Yen-Kheng",
""
],
[
"Wang",
"Qing-hai",
""
]
] | An exact solution is obtained for the gravitational bending of light in static, spherically symmetric metrics which includes the Schwarzschild-de Sitter spacetime and also the Mannheim-Kazanas metric of conformal Weyl gravity. From the exact solution, we obtain a small bending-angle-approximation for a lens system wher... |
2308.01309 | Pankaj Saini | Pankaj Saini, N.V.Krishnendu | Constraining the nature of dark compact objects with spin-induced
octupole moment measurement | 13 pages, 8 figures, published in Phys. Rev. D | Phys. Rev. D 109, 024009 (2024) | null | LIGO-P2300231 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various theoretical models predict the existence of exotic compact objects
that can mimic the properties of black holes (BHs). Gravitational waves (GWs)
from the mergers of compact objects have the potential to distinguish between
exotic compact objects and BHs. The measurement of spin-induced multipole
moments of co... | [
{
"created": "Wed, 2 Aug 2023 17:55:02 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2024 13:54:22 GMT",
"version": "v2"
}
] | 2024-01-24 | [
[
"Saini",
"Pankaj",
""
],
[
"Krishnendu",
"N. V.",
""
]
] | Various theoretical models predict the existence of exotic compact objects that can mimic the properties of black holes (BHs). Gravitational waves (GWs) from the mergers of compact objects have the potential to distinguish between exotic compact objects and BHs. The measurement of spin-induced multipole moments of comp... |
gr-qc/0303097 | Alfredo Sandoval-Villalbazo | A. Sandoval-Villalbazo, L.S. Garcia-Colin and A.L. Garcia-Perciante | Oskar Klein, the sixth dimension and the strength of a magnetic pole | 4 pages. Typos corrected | null | null | null | gr-qc | null | This work extends to six dimensions the idea first proposed by Klein
regarding a closed space in the context of a fifth dimension and its link to
quantum theory. The main result is a formula that expresses the value of the
characteristic length of the sixth dimension in terms of the strength of a
magnetic monopole $g... | [
{
"created": "Tue, 25 Mar 2003 18:08:01 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Apr 2003 19:38:44 GMT",
"version": "v2"
},
{
"created": "Wed, 21 May 2003 22:23:56 GMT",
"version": "v3"
},
{
"created": "Wed, 11 Jun 2003 22:22:47 GMT",
"version": "v4"
},
{
"cr... | 2007-05-23 | [
[
"Sandoval-Villalbazo",
"A.",
""
],
[
"Garcia-Colin",
"L. S.",
""
],
[
"Garcia-Perciante",
"A. L.",
""
]
] | This work extends to six dimensions the idea first proposed by Klein regarding a closed space in the context of a fifth dimension and its link to quantum theory. The main result is a formula that expresses the value of the characteristic length of the sixth dimension in terms of the strength of a magnetic monopole $g$.... |
gr-qc/0111068 | Remo Garattini | Remo Garattini | Entropy from the foam II | Revtex 3.0, 10 pages, Replaced version with minor changes and one
ref. added | Int.J.Mod.Phys. A17 (2002) 1965-1977 | 10.1142/S0217751X02010637 | null | gr-qc hep-th | null | A simple model of spacetime foam, made by two different types of wormholes in
a semiclassical approximation, is taken under examination: one type is a
collection of $N_{w}$ Schwarzschild wormholes, while the other one is made by
Schwarzschild-Anti-de Sitter wormholes. The area quantization related to the
entropy via ... | [
{
"created": "Wed, 21 Nov 2001 19:46:58 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2002 14:19:18 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Garattini",
"Remo",
""
]
] | A simple model of spacetime foam, made by two different types of wormholes in a semiclassical approximation, is taken under examination: one type is a collection of $N_{w}$ Schwarzschild wormholes, while the other one is made by Schwarzschild-Anti-de Sitter wormholes. The area quantization related to the entropy via th... |
gr-qc/9304038 | null | Lajos Diosi | Comment on Consistent Interpretation of Quantum Mechanics Using Quantum
Trajectories | 4 pages, REVTEX | null | null | null | gr-qc | null | Recently, Griffiths presented a generalization of the consistent history
approach to quantum mechanics. I can easily construct all possible complete
families satisfying Griffiths' "noninterference conditions". Since only trivial
families exist one may conclude that Griffiths' proposal has not got farther
than the ord... | [
{
"created": "Tue, 27 Apr 1993 01:17:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Diosi",
"Lajos",
""
]
] | Recently, Griffiths presented a generalization of the consistent history approach to quantum mechanics. I can easily construct all possible complete families satisfying Griffiths' "noninterference conditions". Since only trivial families exist one may conclude that Griffiths' proposal has not got farther than the ordin... |
1801.10474 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Wormholes in f(R) gravity with a noncommutative-geometry background | 12 pages, 1 figure | Indian Journal of Physics, vol. 92, pp. 1207-1212 (2018) | 10.1007/s12648-018-1213-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper discusses the possible existence of traversable wormholes in f(R)
modified gravity while assuming a noncommutative-geometry background, as well
as zero tidal forces. The first part of the paper aims for an overview via
several shape functions by determining the corresponding wormhole solutions and
their pr... | [
{
"created": "Wed, 31 Jan 2018 15:07:42 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2018 19:21:11 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Jul 2020 17:58:09 GMT",
"version": "v3"
}
] | 2020-07-28 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | This paper discusses the possible existence of traversable wormholes in f(R) modified gravity while assuming a noncommutative-geometry background, as well as zero tidal forces. The first part of the paper aims for an overview via several shape functions by determining the corresponding wormhole solutions and their prop... |
1807.05763 | Oleg Zaslavskii | O. B. Zaslavskii | Pure electric Penrose and super-Penrose processes in the flat space-time | 15 pages. Presentation improved and expanded. Important ref. 22
added. To appear in Int. J. Mod. Phys. D | Int. J. Mod. Phys. D. Vol. 28 (2019) 1950062 | 10.1142/S0218271819500627 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let a particle move in the flat space-time under the action of the electric
potential. If it decays to two fragments, the energy of debris can be larger
than the original energy and, moreover, the efficiency of such a process can be
unbounded. This effect can be considered as a limit of the Denardo-Ruffini
process ne... | [
{
"created": "Mon, 16 Jul 2018 09:59:59 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2018 23:35:57 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Aug 2018 11:15:58 GMT",
"version": "v3"
},
{
"created": "Tue, 27 Nov 2018 20:23:32 GMT",
"version": "v4"
}
] | 2019-03-27 | [
[
"Zaslavskii",
"O. B.",
""
]
] | Let a particle move in the flat space-time under the action of the electric potential. If it decays to two fragments, the energy of debris can be larger than the original energy and, moreover, the efficiency of such a process can be unbounded. This effect can be considered as a limit of the Denardo-Ruffini process near... |
2003.10429 | Yen Chin Ong | Yen Chin Ong, Michael R. R. Good | The Quantum Atmosphere of Reissner-Nordstr\"om Black Holes | null | Phys. Rev. Research 2, 033322 (2020) | 10.1103/PhysRevResearch.2.033322 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation originates from a "quantum atmosphere" around black holes,
not necessarily from the vicinity of the horizon. We examine and discuss the
properties of quantum atmospheres of asymptotically flat Reissner-Nordstr\"om
black holes, which extends further and further away from the black hole as
extremality... | [
{
"created": "Mon, 23 Mar 2020 17:57:12 GMT",
"version": "v1"
}
] | 2020-09-01 | [
[
"Ong",
"Yen Chin",
""
],
[
"Good",
"Michael R. R.",
""
]
] | Hawking radiation originates from a "quantum atmosphere" around black holes, not necessarily from the vicinity of the horizon. We examine and discuss the properties of quantum atmospheres of asymptotically flat Reissner-Nordstr\"om black holes, which extends further and further away from the black hole as extremality i... |
2007.15345 | Francisco Lobo | Tiberiu Harko, Francisco S. N. Lobo | Beyond Einstein's General Relativity: Hybrid metric-Palatini gravity and
curvature-matter couplings | 68 pages; invited review paper to appear in IJMPD (abstract in
metadata shortened) | Int. J. Mod. Phys. D 29, 2030008 (2020) | 10.1142/S0218271820300086 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein's General Relativity (GR) is possibly one of the greatest
intellectual achievements ever conceived by the human mind. In fact, over the
last century, GR has proven to be an extremely successful theory, with a well
established experimental footing. However, the discovery of the late-time
cosmic acceleration, ... | [
{
"created": "Thu, 30 Jul 2020 09:50:18 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | Einstein's General Relativity (GR) is possibly one of the greatest intellectual achievements ever conceived by the human mind. In fact, over the last century, GR has proven to be an extremely successful theory, with a well established experimental footing. However, the discovery of the late-time cosmic acceleration, wh... |
0803.2707 | Shuang Wang | Shuang Wang, Yang Zhang, Tian-Yang Xia, and Hai-Xing Miao | Modifications by QCD transition and $e^+e^-$ annihilation on analytic
spectrum of relic gravitational waves in accelerating universe | 21 pages, 14 figures, to appear in PRD | Phys.Rev.D77:104016,2008 | 10.1103/PhysRevD.77.104016 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As predicted by quantum chromodynamics(QCD), around $T\sim 190$ MeV in the
early universe, the QCD transition occurs during which the quarks are combined
into the massive hadrons. This process reduces the effective relativistic
degree of freedom, and causes a change in the expansion behavior of the
universe. Similarl... | [
{
"created": "Wed, 19 Mar 2008 14:15:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Wang",
"Shuang",
""
],
[
"Zhang",
"Yang",
""
],
[
"Xia",
"Tian-Yang",
""
],
[
"Miao",
"Hai-Xing",
""
]
] | As predicted by quantum chromodynamics(QCD), around $T\sim 190$ MeV in the early universe, the QCD transition occurs during which the quarks are combined into the massive hadrons. This process reduces the effective relativistic degree of freedom, and causes a change in the expansion behavior of the universe. Similarly,... |
gr-qc/9701062 | N. Redington | N. Redington | On the Significance of the Fifth Coordinate in Wesson's Version of
Kaluza-Klein Theory | 2 pages | null | null | null | gr-qc | null | It is argued that the fifth coordinate should correspond to an intensive
parameter rather than to rest-mass as originally proposed by Wesson.
| [
{
"created": "Wed, 29 Jan 1997 22:17:20 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Feb 1997 20:12:11 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Redington",
"N.",
""
]
] | It is argued that the fifth coordinate should correspond to an intensive parameter rather than to rest-mass as originally proposed by Wesson. |
1907.08270 | Fernando Carneiro | F. L. Carneiro, S. C. Ulhoa and J. F. da Rocha-Neto | Energy-momentum and angular-momentum of a gyratonic pp-waves spacetime | null | Phys. Rev. D 100, 024023 (2019) | 10.1103/PhysRevD.100.024023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gyratonic plane fronted gravitational waves are exact solutions of Einstein's
field equations, which correspond to gravitational waves that carry momentum
and angular-momentum. Using the definitions of the Hamiltonian formulation of
the Teleparallel Equivalent of General Relativity, we explicitly evaluate the
general... | [
{
"created": "Thu, 18 Jul 2019 20:25:29 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Carneiro",
"F. L.",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"da Rocha-Neto",
"J. F.",
""
]
] | Gyratonic plane fronted gravitational waves are exact solutions of Einstein's field equations, which correspond to gravitational waves that carry momentum and angular-momentum. Using the definitions of the Hamiltonian formulation of the Teleparallel Equivalent of General Relativity, we explicitly evaluate the general e... |
gr-qc/0202097 | Rafael D. Sorkin | Graham Brightwell (London School of Economics), H. Fay Dowker and Joe
Henson (Queen Mary College, University of London), Raquel S. Garcia (Imperial
College, London), Rafael D. Sorkin (Queen Mary College and Syracuse
University) | General Covariance and the "Problem of Time" in a Discrete Cosmology | plainTeX, 17 pages on 8.5x11 inch paper. To appear in the proceedings
of the Alternative Natural Philosophy Association meeting, held August 16-21,
2001, Cambridge, England | null | null | SU-GP-2001/12-1 | gr-qc hep-th | null | Identifying an appropriate set of ``observables'' is a nontrivial task for
most approaches to quantum gravity. We describe how it may be accomplished in
the context of a recently proposed family of stochastic (but classical)
dynamical laws for causal sets. The underlying idea should work equally well in
the quantum c... | [
{
"created": "Wed, 27 Feb 2002 22:17:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brightwell",
"Graham",
"",
"London School of Economics"
],
[
"Dowker",
"H. Fay",
"",
"Queen Mary College, University of London"
],
[
"Henson",
"Joe",
"",
"Queen Mary College, University of London"
],
[
"Garcia",
"Raquel S.",
"",
"Imperia... | Identifying an appropriate set of ``observables'' is a nontrivial task for most approaches to quantum gravity. We describe how it may be accomplished in the context of a recently proposed family of stochastic (but classical) dynamical laws for causal sets. The underlying idea should work equally well in the quantum cas... |
1302.1341 | Qing-Yu Cai | Baocheng Zhang, Qing-yu Cai, Ming-sheng Zhan, and Li You | Towards experimentally testing the paradox of black hole information
loss | Published version. 6 figures | Phys. Rev. D 87, 044006 (2013) | 10.1103/PhysRevD.87.044006 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Information about the collapsed matter in a black hole will be lost if
Hawking radiations are truly thermal. Recent studies discover that information
can be transmitted from a black hole by Hawking radiations, due to their
spectrum deviating from exact thermality when back reaction is considered. In
this paper, we fo... | [
{
"created": "Wed, 6 Feb 2013 12:39:55 GMT",
"version": "v1"
}
] | 2013-02-07 | [
[
"Zhang",
"Baocheng",
""
],
[
"Cai",
"Qing-yu",
""
],
[
"Zhan",
"Ming-sheng",
""
],
[
"You",
"Li",
""
]
] | Information about the collapsed matter in a black hole will be lost if Hawking radiations are truly thermal. Recent studies discover that information can be transmitted from a black hole by Hawking radiations, due to their spectrum deviating from exact thermality when back reaction is considered. In this paper, we focu... |
1905.09463 | Djordje Minic | Per Berglund, Tristan Hubsch and Djordje Minic | On Dark Energy and Quantum Gravity | 7 pages; This essay received an honorable mention in the Gravity
Research Foundation 2019 Awards for Essays on Gravitation competition. arXiv
admin note: substantial text overlap with arXiv:1905.08269 | Int. J. Mod. Physics D28 (14) (2019) 1902003 | 10.1142/S0218271819440188 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Realizing dark energy and the observed de Sitter spacetime in quantum gravity
has proven to be obstructed in most every usual approach. We argue that
additional degrees of freedom of the left- and right-movers in string theory
and a resulting doubled, non-commutatively generalized geometric formulation
thereof can le... | [
{
"created": "Wed, 22 May 2019 14:04:27 GMT",
"version": "v1"
}
] | 2019-12-04 | [
[
"Berglund",
"Per",
""
],
[
"Hubsch",
"Tristan",
""
],
[
"Minic",
"Djordje",
""
]
] | Realizing dark energy and the observed de Sitter spacetime in quantum gravity has proven to be obstructed in most every usual approach. We argue that additional degrees of freedom of the left- and right-movers in string theory and a resulting doubled, non-commutatively generalized geometric formulation thereof can lead... |
gr-qc/0611100 | Domenico Giulini | Domenico Giulini | What is (not) wrong with scalar gravity? | 26 pages, 3 figures | Studies in History and Philosophy of Modern Physics Volume 39,
Issue 1, January 2008, Pages 154-180 | 10.1016/j.shpsb.2007.09.001 | null | gr-qc | null | On his way to General Relativity (GR) Einstein gave several arguments as to
why a special relativistic theory of gravity based on a massless scalar field
could be ruled out merely on grounds of theoretical considerations. We
re-investigate his two main arguments, which relate to energy conservation and
some form of t... | [
{
"created": "Sun, 19 Nov 2006 15:09:04 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2008 09:03:04 GMT",
"version": "v2"
}
] | 2014-09-10 | [
[
"Giulini",
"Domenico",
""
]
] | On his way to General Relativity (GR) Einstein gave several arguments as to why a special relativistic theory of gravity based on a massless scalar field could be ruled out merely on grounds of theoretical considerations. We re-investigate his two main arguments, which relate to energy conservation and some form of the... |
2209.05115 | Miguel Oliveira | Miguel A. Oliveira | Categorical generalization of MacDowell Mansouri gravity coupled to Kalb
Ramond fields | 20 pages, no figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work we generalize the MacDowell-Mansouri theory of gravity using
strict 2-groups. To achieve this, we construct the categorical generalization
of the ISO(4,1) group, which we call the de Sitter 2-group. We then proceed to
generalize the MacDowell-Mansouri theory in two different ways. First, as a
Yang-Mills-... | [
{
"created": "Mon, 12 Sep 2022 09:56:45 GMT",
"version": "v1"
}
] | 2022-09-13 | [
[
"Oliveira",
"Miguel A.",
""
]
] | In this work we generalize the MacDowell-Mansouri theory of gravity using strict 2-groups. To achieve this, we construct the categorical generalization of the ISO(4,1) group, which we call the de Sitter 2-group. We then proceed to generalize the MacDowell-Mansouri theory in two different ways. First, as a Yang-Mills-ty... |
2103.10849 | Masoud Ghezelbash | Bardia H. Fahim, Masoud Ghezelbash | New class of exact solutions to Einstein-Maxwell-dilaton theory on
four-dimensional Bianchi type IX geometry | 38 pages, 15 figures, two new appendices added, typos corrected | The European Physical Journal C 81, 587 (2021) | 10.1140/epjc/s10052-021-09395-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct new classes of cosmological solution to the five dimensional
Einstein-Maxwell-dilaton theory, that are non-stationary and almost conformally
regular everywhere. The base geometry for the solutions is the four-dimensional
Bianchi type IX geometry. In the theory, the dilaton field is coupled to the
electro... | [
{
"created": "Fri, 19 Mar 2021 15:03:13 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 2021 01:34:59 GMT",
"version": "v2"
}
] | 2021-07-21 | [
[
"Fahim",
"Bardia H.",
""
],
[
"Ghezelbash",
"Masoud",
""
]
] | We construct new classes of cosmological solution to the five dimensional Einstein-Maxwell-dilaton theory, that are non-stationary and almost conformally regular everywhere. The base geometry for the solutions is the four-dimensional Bianchi type IX geometry. In the theory, the dilaton field is coupled to the electroma... |
gr-qc/0404043 | Belinch\'on Jos\'e Antonio | Jos\'e Antonio Belinch\'on and P. D\'avila | Cosmological Models with Variable Constants.Their Solution Through
Similarity Methods | 20 pages, RevTeX4 | Class.Quant.Grav. 17 (2000) 3183-3198 | 10.1088/0264-9381/17/16/307 | null | gr-qc | null | In this work we compile a few differential equations (ODEs) that arise from
the relativistic equations in cosmological models that consider the
``constants'' as scalars functions dependent on time and they are described as
perfect as well as viscous fluids. The general idea of the paper is to show how
to solve the eq... | [
{
"created": "Fri, 9 Apr 2004 16:35:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Belinchón",
"José Antonio",
""
],
[
"Dávila",
"P.",
""
]
] | In this work we compile a few differential equations (ODEs) that arise from the relativistic equations in cosmological models that consider the ``constants'' as scalars functions dependent on time and they are described as perfect as well as viscous fluids. The general idea of the paper is to show how to solve the equa... |
gr-qc/0302084 | Roberto De Pietri | Juri Agresti (Firenze Univ.), Roberto De Pietri (Parma Univ. & INFN),
Luca Lusanna (INFN, Firenze) and Luca Martucci (Milano Univ. & INFN) | Hamiltonian linearization of the rest-frame instant form of tetrad
gravity in a completely fixed 3-orthogonal gauge: a radiation gauge for
background-independent gravitational waves in a post-Minkowskian Einstein
spacetime | LaTeX (RevTeX3), 94 pages, 4 figures | Gen.Rel.Grav. 36 (2004) 1055-1134 | 10.1023/B:GERG.0000018089.84710.d6 | null | gr-qc astro-ph hep-th | null | In the framework of the rest-frame instant form of tetrad gravity, where the
Hamiltonian is the weak ADM energy ${\hat E}_{ADM}$, we define a special
completely fixed 3-orthogonal Hamiltonian gauge, corresponding to a choice of
{\it non-harmonic} 4-coordinates, in which the independent degrees of freedom
of the gravi... | [
{
"created": "Thu, 20 Feb 2003 11:32:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Agresti",
"Juri",
"",
"Firenze Univ."
],
[
"De Pietri",
"Roberto",
"",
"Parma Univ. & INFN"
],
[
"Lusanna",
"Luca",
"",
"INFN, Firenze"
],
[
"Martucci",
"Luca",
"",
"Milano Univ. & INFN"
]
] | In the framework of the rest-frame instant form of tetrad gravity, where the Hamiltonian is the weak ADM energy ${\hat E}_{ADM}$, we define a special completely fixed 3-orthogonal Hamiltonian gauge, corresponding to a choice of {\it non-harmonic} 4-coordinates, in which the independent degrees of freedom of the gravita... |
1304.6334 | Pisin Chen | Pisin Chen, Keisuke Izumi, Nien-En Tung | Natural Emergence of Cosmological Constant and Dark Radiation from
Stephenson-Kilmister-Yang-Camenzind Theory of Gravity | 7 pages | Phys. Rev. D 88, 123006 (2013) | 10.1103/PhysRevD.88.123006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Stephenson-Kilmister-Yang (SKY) equation combined with
Camenzind's matter current term naturally provides the cosmological constant
and dark radiation as integration constants of the SKYC field equation. To
characterize the property of the dark radiation, we develop a method to
separate it from the o... | [
{
"created": "Tue, 23 Apr 2013 15:49:34 GMT",
"version": "v1"
}
] | 2013-12-25 | [
[
"Chen",
"Pisin",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Tung",
"Nien-En",
""
]
] | We show that the Stephenson-Kilmister-Yang (SKY) equation combined with Camenzind's matter current term naturally provides the cosmological constant and dark radiation as integration constants of the SKYC field equation. To characterize the property of the dark radiation, we develop a method to separate it from the ord... |
1910.13818 | Ignazio Ciufolini | Ignazio Ciufolini, Antonio Paolozzi, Erricos C. Pavlis, Giampiero
Sindoni, Rolf Koenig, John C. Ries, Richard Matzner, Vahe Gurzadyan, Roger
Penrose, David Rubincam, Claudio Paris | A new laser-ranged satellite for General Relativity and space geodesy:
I. An introduction to the LARES2 space experiment | 16 pages | Eur. Phys. J. Plus (2017) 132: 336 | 10.1140/epjp/i2017-11635-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the LARES 2 space experiment recently approved by the Italian
Space Agency (ASI). The LARES 2 satellite is planned for launch in 2019 with
the new VEGA C launch vehicle of ASI, ESA and ELV. The orbital analysis of
LARES 2 experiment will be carried out by our international science team of
experts in Gene... | [
{
"created": "Fri, 25 Oct 2019 22:00:46 GMT",
"version": "v1"
}
] | 2019-10-31 | [
[
"Ciufolini",
"Ignazio",
""
],
[
"Paolozzi",
"Antonio",
""
],
[
"Pavlis",
"Erricos C.",
""
],
[
"Sindoni",
"Giampiero",
""
],
[
"Koenig",
"Rolf",
""
],
[
"Ries",
"John C.",
""
],
[
"Matzner",
"Richard",
""
... | We introduce the LARES 2 space experiment recently approved by the Italian Space Agency (ASI). The LARES 2 satellite is planned for launch in 2019 with the new VEGA C launch vehicle of ASI, ESA and ELV. The orbital analysis of LARES 2 experiment will be carried out by our international science team of experts in Genera... |
0904.0620 | Lydia Bieri | Lydia Bieri | An Extension of the Stability Theorem of the Minkowski Space in General
Relativity | 50 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we sketch the proof of the extension of the stability theorem
of the Minkowski space in General Relativity done explicitly in previous work
by the present author. We discuss solutions of the Einstein vacuum (EV)
equations. We solve the Cauchy problem for more general, asymptotically flat
initial data t... | [
{
"created": "Fri, 3 Apr 2009 16:37:57 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2009 18:19:10 GMT",
"version": "v2"
}
] | 2009-08-10 | [
[
"Bieri",
"Lydia",
""
]
] | In this paper, we sketch the proof of the extension of the stability theorem of the Minkowski space in General Relativity done explicitly in previous work by the present author. We discuss solutions of the Einstein vacuum (EV) equations. We solve the Cauchy problem for more general, asymptotically flat initial data tha... |
gr-qc/9703025 | null | Reza Tavakol (Queen Mary and Westfield College, London) and Roustam
Zalaletdinov (Queen Mary and Westfield College, London and Department of
Theoretical Physics, Institute of Nuclear Physics, Tashkent) | On the Domain of Applicability of General Relativity | 19 pages, LaTeX, submitted to Found. Phys | Found.Phys. 28 (1998) 307-331 | 10.1023/A:1018761005186 | QMW-AU-96011 (March 1996) | gr-qc astro-ph | null | We consider the domain of applicability of general relativity (GR), as a
classical theory of gravity, by considering its applications to a variety of
settings of physical interest as well as its relationship with real
observations. We argue that, as it stands, GR is deficient whether it is
treated as a microscopic or... | [
{
"created": "Fri, 7 Mar 1997 23:14:06 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Tavakol",
"Reza",
"",
"Queen Mary and Westfield College, London"
],
[
"Zalaletdinov",
"Roustam",
"",
"Queen Mary and Westfield College, London and Department of\n Theoretical Physics, Institute of Nuclear Physics, Tashkent"
]
] | We consider the domain of applicability of general relativity (GR), as a classical theory of gravity, by considering its applications to a variety of settings of physical interest as well as its relationship with real observations. We argue that, as it stands, GR is deficient whether it is treated as a microscopic or a... |
2104.08841 | Benrong Mu | Jing Liang, Benrong Mu and Peng Wang | Joule-Thomson expansion of Lower-dimensional black hole | 18 pages, 3 figures and 1 table, some minor changes | null | 10.1103/PhysRevD.104.124003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Joule-Thomson expansion is extended to the lower-dimensional regime by
considering the rotating BTZ metric in the (2+1)-dimensional space-time.
Specifically, the properties of three important aspects of the Joule-Thomson
expansion, namely the Joule-Thomson coefficient, the inversion curve and the
isenthalpic curv... | [
{
"created": "Sun, 18 Apr 2021 12:39:27 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 2021 13:51:08 GMT",
"version": "v2"
}
] | 2021-12-15 | [
[
"Liang",
"Jing",
""
],
[
"Mu",
"Benrong",
""
],
[
"Wang",
"Peng",
""
]
] | The Joule-Thomson expansion is extended to the lower-dimensional regime by considering the rotating BTZ metric in the (2+1)-dimensional space-time. Specifically, the properties of three important aspects of the Joule-Thomson expansion, namely the Joule-Thomson coefficient, the inversion curve and the isenthalpic curve ... |
1907.10112 | Alexander Zhidenko | Roman A. Konoplya, Thomas Pappas and Alexander Zhidenko | Einstein-scalar-Gauss-Bonnet black holes: Analytical approximation for
the metric and applications to calculations of shadows | 20 pages, 7 figures, 1 ancillary Mathematica(R) notebook, version
accepted for publication in Phys. Rev. D | Phys. Rev. D 101, 044054 (2020) | 10.1103/PhysRevD.101.044054 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, numerical solutions to the field equations of
Einstein-scalar-Gauss-Bonnet gravity that correspond to black-holes with
non-trivial scalar hair have been reported. Here, we employ the method of the
continued-fraction expansion in terms of a compact coordinate in order to
obtain an analytical approximation fo... | [
{
"created": "Tue, 23 Jul 2019 19:50:15 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2019 15:45:19 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Feb 2020 17:20:18 GMT",
"version": "v3"
}
] | 2020-02-28 | [
[
"Konoplya",
"Roman A.",
""
],
[
"Pappas",
"Thomas",
""
],
[
"Zhidenko",
"Alexander",
""
]
] | Recently, numerical solutions to the field equations of Einstein-scalar-Gauss-Bonnet gravity that correspond to black-holes with non-trivial scalar hair have been reported. Here, we employ the method of the continued-fraction expansion in terms of a compact coordinate in order to obtain an analytical approximation for ... |
1904.03131 | Richard Brito | Emanuele Berti, Richard Brito, Caio F. B. Macedo, Guilherme Raposo,
Joao Luis Rosa | Ultralight boson cloud depletion in binary systems | 12 pages, 6 figures. v2: references added, matches published version | Phys. Rev. D 99, 104039 (2019) | 10.1103/PhysRevD.99.104039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight scalars can extract rotational energy from astrophysical black
holes through superradiant instabilities, forming macroscopic boson clouds.
This process is most efficient when the Compton wavelength of the boson is
comparable to the size of the black hole horizon, i.e. when the "gravitational
fine structure... | [
{
"created": "Fri, 5 Apr 2019 15:55:50 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 10:05:47 GMT",
"version": "v2"
}
] | 2019-05-17 | [
[
"Berti",
"Emanuele",
""
],
[
"Brito",
"Richard",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"Raposo",
"Guilherme",
""
],
[
"Rosa",
"Joao Luis",
""
]
] | Ultralight scalars can extract rotational energy from astrophysical black holes through superradiant instabilities, forming macroscopic boson clouds. This process is most efficient when the Compton wavelength of the boson is comparable to the size of the black hole horizon, i.e. when the "gravitational fine structure c... |
2112.14020 | Bayram Tekin | Emel Altas, Ercan Kilicarslan, Bayram Tekin | Anomalous Dispersion in Gravity Theories | 16 pages, v2 matches the published version with additional references | Phys.Rev.D 105 (2022) 6, 064027 | 10.1103/PhysRevD.105.064027 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A wave pulse (be it a gravitational wave or a light wave) undergoes anomalous
dispersion in a vacuum in flat spacetimes with an even number of spatial
dimensions even if all the frequencies move at the same speed. Such an
anomalous dispersion does not occur in spacetimes with an odd number of spatial
dimensions. We s... | [
{
"created": "Tue, 28 Dec 2021 07:17:01 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 05:16:37 GMT",
"version": "v2"
}
] | 2022-03-17 | [
[
"Altas",
"Emel",
""
],
[
"Kilicarslan",
"Ercan",
""
],
[
"Tekin",
"Bayram",
""
]
] | A wave pulse (be it a gravitational wave or a light wave) undergoes anomalous dispersion in a vacuum in flat spacetimes with an even number of spatial dimensions even if all the frequencies move at the same speed. Such an anomalous dispersion does not occur in spacetimes with an odd number of spatial dimensions. We stu... |
2209.07441 | Maxim Misyura | Vitalii Vertogradov, Maxim Misyura | Vaidya and generalized Vaidya solutions by gravitational decoupling | 15. arXiv admin note: text overlap with arXiv:1904.08120 by other
authors | Universe 2022, 8(11), 567 | 10.3390/universe8110567 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper we apply the gravitational decoupling method for dynamical
systems in order to obtain a new type of solution which can describe a hairy
dynamical black hole. We consider three cases of decoupling. The first one is
the simplest and well-known when the mass function is the function only of
space coordinat... | [
{
"created": "Thu, 15 Sep 2022 16:42:54 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2022 12:03:31 GMT",
"version": "v2"
}
] | 2022-12-08 | [
[
"Vertogradov",
"Vitalii",
""
],
[
"Misyura",
"Maxim",
""
]
] | In this paper we apply the gravitational decoupling method for dynamical systems in order to obtain a new type of solution which can describe a hairy dynamical black hole. We consider three cases of decoupling. The first one is the simplest and well-known when the mass function is the function only of space coordinate ... |
2109.09768 | Anna Ijjas | Anna Ijjas and Frans Pretorius and Paul J. Steinhardt and David
Garfinkle | Dynamical attractors in contracting spacetimes dominated by kinetically
coupled scalar fields | 25 pages, 5 figures | JCAP 12 (2021) 030 | 10.1088/1475-7516/2021/12/030 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present non-perturbative numerical relativity simulations of slowly
contracting spacetimes in which the scalar field driving slow contraction is
coupled to a second scalar field through an exponential non-linear sigma
model-type kinetic interaction. These models are important because they can
generate a nearly sca... | [
{
"created": "Mon, 20 Sep 2021 18:01:45 GMT",
"version": "v1"
}
] | 2021-12-14 | [
[
"Ijjas",
"Anna",
""
],
[
"Pretorius",
"Frans",
""
],
[
"Steinhardt",
"Paul J.",
""
],
[
"Garfinkle",
"David",
""
]
] | We present non-perturbative numerical relativity simulations of slowly contracting spacetimes in which the scalar field driving slow contraction is coupled to a second scalar field through an exponential non-linear sigma model-type kinetic interaction. These models are important because they can generate a nearly scale... |
1512.04183 | Craig M. Savage | C. C. Gan, C. M. Savage and S. Z. Scully | Optomechanical tests of a Schr\"odinger-Newton equation for
gravitational quantum mechanics | 8 pages. Revised in response to referees. Corrections and convention
changes | Phys. Rev. D 93, 124049 (2016) | 10.1103/PhysRevD.93.124049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that optomechanical systems can test the Schr\"{o}dinger-Newton
equation of gravitational quantum mechanics due to Yang et al. This equation is
motivated by semiclassical gravity, a widely used theory of interacting
gravitational and quantum fields. From the many-body Schr\"{o}dinger-Newton
equation follows a... | [
{
"created": "Mon, 14 Dec 2015 06:04:08 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2016 06:32:09 GMT",
"version": "v2"
}
] | 2016-06-29 | [
[
"Gan",
"C. C.",
""
],
[
"Savage",
"C. M.",
""
],
[
"Scully",
"S. Z.",
""
]
] | We show that optomechanical systems can test the Schr\"{o}dinger-Newton equation of gravitational quantum mechanics due to Yang et al. This equation is motivated by semiclassical gravity, a widely used theory of interacting gravitational and quantum fields. From the many-body Schr\"{o}dinger-Newton equation follows an ... |
gr-qc/9809015 | Yungui Gong | Yungui Gong | Einstein-Brans-Dicke Cosmology | 10 pages, 4 figures, latex, add new results | null | null | null | gr-qc | null | We studied the Einstein-Brans-Dicke cosmology in detail. The difference of
the evolution of the universe is significant between Einstein-Brans-Dicke
cosmology and standard big-bang model during the radiation-dominated era. The
power-law evolution of the scale factor is fast enough to solve the
cosmological puzzles an... | [
{
"created": "Thu, 3 Sep 1998 21:18:44 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 1999 19:34:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Gong",
"Yungui",
""
]
] | We studied the Einstein-Brans-Dicke cosmology in detail. The difference of the evolution of the universe is significant between Einstein-Brans-Dicke cosmology and standard big-bang model during the radiation-dominated era. The power-law evolution of the scale factor is fast enough to solve the cosmological puzzles and ... |
2311.07706 | Pratik Wagle | Pratik Wagle, Dongjun Li, Yanbei Chen, and Nicolas Yunes | Perturbations of spinning black holes in dynamical Chern-Simons gravity
I. Slow rotation equations | 40 pages, 2 figures and 1 table | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of gravitational waves resulting by the LIGO-Virgo-Kagra
collaboration has inaugurated a new era in gravitational physics, providing an
opportunity to test general relativity and its modifications in the strong
gravity regime. One such test involves the study of the ringdown phase of
gravitational waves... | [
{
"created": "Mon, 13 Nov 2023 19:45:22 GMT",
"version": "v1"
}
] | 2023-11-15 | [
[
"Wagle",
"Pratik",
""
],
[
"Li",
"Dongjun",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Yunes",
"Nicolas",
""
]
] | The detection of gravitational waves resulting by the LIGO-Virgo-Kagra collaboration has inaugurated a new era in gravitational physics, providing an opportunity to test general relativity and its modifications in the strong gravity regime. One such test involves the study of the ringdown phase of gravitational waves f... |
2310.10346 | Vipin Kumar Sharma Dr. | Vipin Kumar Sharma, Sreekanth Harikumar, Margherita Grespan, Marek
Biesiada and Murli Manohar Verma | Probing massive gravitons in $f(R)$ with lensed gravitational waves | 16 pages, 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the novel features of gravitational wave solutions in $f(R)$
gravity under proper gauge considerations in the shifted Ricci scalar
background curvature ($R^{1+\epsilon}$). The solution is further explored to
study the modified dispersion relations for massive modes at local scales and
to derive constra... | [
{
"created": "Mon, 16 Oct 2023 12:32:42 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2023 18:38:48 GMT",
"version": "v2"
}
] | 2023-10-27 | [
[
"Sharma",
"Vipin Kumar",
""
],
[
"Harikumar",
"Sreekanth",
""
],
[
"Grespan",
"Margherita",
""
],
[
"Biesiada",
"Marek",
""
],
[
"Verma",
"Murli Manohar",
""
]
] | We investigate the novel features of gravitational wave solutions in $f(R)$ gravity under proper gauge considerations in the shifted Ricci scalar background curvature ($R^{1+\epsilon}$). The solution is further explored to study the modified dispersion relations for massive modes at local scales and to derive constrain... |
gr-qc/9908033 | Carey Carpenter Briggs | C. C. Briggs | A Simple Formula for Generating Chern Characters by Repeated Exterior
Differentiation | 3 pages | null | null | null | gr-qc | null | A simple formula is given for generating Chern characters by repeated
exterior differentiation for n-dimensional differentiable manifolds having a
general linear connection.
| [
{
"created": "Wed, 11 Aug 1999 02:08:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Briggs",
"C. C.",
""
]
] | A simple formula is given for generating Chern characters by repeated exterior differentiation for n-dimensional differentiable manifolds having a general linear connection. |
1901.06098 | Keisuke Nakashi | Keisuke Nakashi, Shinpei Kobayashi, Shu Ueda, Hiromi Saida | Null Geodesics and Repulsive Behavior of Gravity in (2+1)-dimensional
Massive Gravity | 10 pages, 6 figures, matches published version in PTEP | Progress of Theoretical and Experimental Physics, Volume 2019,
Issue 7, July 2019, 073E02 | 10.1093/ptep/ptz062 | RUP-19-2 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the null geodesics in a static circularly symmetric (SCS) black hole
spacetime which is a solution in the $(2+1)$-dimensional massive gravity
proposed by Bergshoeff, Hohm and Townsend (BHT massive gravity). We obtain
analytic solutions for the null geodesic equation in the SCS black hole
background and find ... | [
{
"created": "Fri, 18 Jan 2019 06:35:51 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Jul 2019 06:38:16 GMT",
"version": "v2"
}
] | 2019-07-23 | [
[
"Nakashi",
"Keisuke",
""
],
[
"Kobayashi",
"Shinpei",
""
],
[
"Ueda",
"Shu",
""
],
[
"Saida",
"Hiromi",
""
]
] | We study the null geodesics in a static circularly symmetric (SCS) black hole spacetime which is a solution in the $(2+1)$-dimensional massive gravity proposed by Bergshoeff, Hohm and Townsend (BHT massive gravity). We obtain analytic solutions for the null geodesic equation in the SCS black hole background and find th... |
2311.17999 | Manuel Hohmann | Helen Asuk\"ula, Sebastian Bahamonde, Manuel Hohmann, Vasiliki
Karanasou, Christian Pfeifer, Jo\~ao Lu\'is Rosa | Spherically symmetric vacuum solutions in 1-Parameter New General
Relativity and their phenomenology | 17 pages, several figures, journal version | Phys.Rev.D 109 no. 6 (2024) 064027 | 10.1103/PhysRevD.109.064027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study spherically symmetric vacuum solutions in 1-parameter
New General Relativity (NGR), a specific theory in teleparallel gravity which
is constructed from the three possible quadratic scalars obtained from torsion
with arbitrary coefficients satisfying the requirements for the absence of
ghosts. I... | [
{
"created": "Wed, 29 Nov 2023 19:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2024 14:24:04 GMT",
"version": "v2"
}
] | 2024-03-13 | [
[
"Asuküla",
"Helen",
""
],
[
"Bahamonde",
"Sebastian",
""
],
[
"Hohmann",
"Manuel",
""
],
[
"Karanasou",
"Vasiliki",
""
],
[
"Pfeifer",
"Christian",
""
],
[
"Rosa",
"João Luís",
""
]
] | In this work, we study spherically symmetric vacuum solutions in 1-parameter New General Relativity (NGR), a specific theory in teleparallel gravity which is constructed from the three possible quadratic scalars obtained from torsion with arbitrary coefficients satisfying the requirements for the absence of ghosts. In ... |
1108.3059 | Bahram Mashhoon | B. Mashhoon and P.S. Wesson | Mach, the Universe, and Foundations of Mechanics | 3 pages, response to Barbour's paper (arXiv:1108.3057) | Annalen Phys.524:A44,2012 | 10.1002/andp.201100305 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Barbour's response to our recent paper on "Mach's principle and
higher-dimensional dynamics" describes an approach to Mach's principle in which
the universe as a whole is involved in the definition of inertial frames of
reference. Moreover, Barbour's theoretical procedure is in agreement with
general relativity for a... | [
{
"created": "Mon, 15 Aug 2011 19:01:40 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2012 22:39:58 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Mashhoon",
"B.",
""
],
[
"Wesson",
"P. S.",
""
]
] | Barbour's response to our recent paper on "Mach's principle and higher-dimensional dynamics" describes an approach to Mach's principle in which the universe as a whole is involved in the definition of inertial frames of reference. Moreover, Barbour's theoretical procedure is in agreement with general relativity for a f... |
0710.0701 | James Battat | James B. R. Battat, John F. Chandler and Christopher Stubbs | The First Lunar Ranging Constraints on Gravity Sector SME Parameters | 7 pages, presented at the Fourth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, August 2007 | null | 10.1142/9789812779519_0041 | null | gr-qc astro-ph | null | We present the first constraints on pure-gravity sector Standard-Model
Extension (SME) parameters using Lunar Laser Ranging (LLR). LLR measures the
round trip travel time of light between the Earth and the Moon. With 34+ years
of LLR data, we have constrained six independent linear combinations of SME
parameters at t... | [
{
"created": "Wed, 3 Oct 2007 02:57:38 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Battat",
"James B. R.",
""
],
[
"Chandler",
"John F.",
""
],
[
"Stubbs",
"Christopher",
""
]
] | We present the first constraints on pure-gravity sector Standard-Model Extension (SME) parameters using Lunar Laser Ranging (LLR). LLR measures the round trip travel time of light between the Earth and the Moon. With 34+ years of LLR data, we have constrained six independent linear combinations of SME parameters at the... |
gr-qc/9711029 | Benjamin C. Harms | R. Casadio, B. Harms and Y. Leblanc | Semiclassical Quantization on Black Hole Spacetimes | 3 pages, mprocl.sty, To appear in the proceedings of the 8th Marcel
Grossmann Meeting | null | null | UAHEP 978 | gr-qc hep-th | null | The thermodynamical description of black holes is reviewed and critiqued. We
present an alternative, microcanonical description of black holes and discuss
the major differences. In particular the decay rates of black holes are
compared in the two different pictures.
| [
{
"created": "Fri, 7 Nov 1997 21:42:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Casadio",
"R.",
""
],
[
"Harms",
"B.",
""
],
[
"Leblanc",
"Y.",
""
]
] | The thermodynamical description of black holes is reviewed and critiqued. We present an alternative, microcanonical description of black holes and discuss the major differences. In particular the decay rates of black holes are compared in the two different pictures. |
gr-qc/9612001 | null | R.Bergamini, P.Sedici, P.Verrocchio | Inflation for Bianchi IX model | 10 pages, Latex. To be published in Phisical Review D | Phys.Rev.D55:1896-1900,1997 | 10.1103/PhysRevD.55.1896 | null | gr-qc | null | The influence of Inflation on initial (i.e. at Planck's epoch) large
anisotropy of the Universe is studied, considering a more general metric than
the isotropic one: the locally rotationally symmetric (L.R.S.) Bianchi IX
metric. We find, then, a large set of initial conditions of intrinsic curvature
and shear allowin... | [
{
"created": "Fri, 29 Nov 1996 10:51:01 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Bergamini",
"R.",
""
],
[
"Sedici",
"P.",
""
],
[
"Verrocchio",
"P.",
""
]
] | The influence of Inflation on initial (i.e. at Planck's epoch) large anisotropy of the Universe is studied, considering a more general metric than the isotropic one: the locally rotationally symmetric (L.R.S.) Bianchi IX metric. We find, then, a large set of initial conditions of intrinsic curvature and shear allowing ... |
1311.7174 | John Veitch | Thomas Dent and John Veitch | Optimizing gravitational-wave searches for a population of coalescing
binaries: Intrinsic parameters | Version accepted by Phys. Rev. D | Phys. Rev. D 89, 062002 (2014) | 10.1103/PhysRevD.89.062002 | LIGO Document P1300194-v2 | gr-qc astro-ph.CO astro-ph.HE physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the problem of searching for gravitational waves from inspiralling
compact binaries in Gaussian coloured noise. For binaries with quasicircular
orbits and non-precessing component spins, considering dominant mode emission
only, if the intrinsic parameters of the binary are known then the optimal
statistic ... | [
{
"created": "Wed, 27 Nov 2013 23:05:30 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2014 11:44:26 GMT",
"version": "v2"
}
] | 2014-03-26 | [
[
"Dent",
"Thomas",
""
],
[
"Veitch",
"John",
""
]
] | We revisit the problem of searching for gravitational waves from inspiralling compact binaries in Gaussian coloured noise. For binaries with quasicircular orbits and non-precessing component spins, considering dominant mode emission only, if the intrinsic parameters of the binary are known then the optimal statistic fo... |
2010.03391 | Christian Henke | Christian Henke | Standard Cosmology on the Anti-de Sitter boundary | null | Class. Quantum Grav. 38 225001 (2021) | 10.1088/1361-6382/ac27ee | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The well-known brane world model of cosmology is an alternative to the
standard model of cosmology, called {\Lambda}CDM (Lambda Cold Dark Matter)
model. However, the quadratical energy density of the brane universe requires
an undesirable fine tuning. The paper develops a new Anti-de Sitter (AdS) brane
world model wi... | [
{
"created": "Tue, 6 Oct 2020 16:19:55 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Aug 2021 14:19:45 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Sep 2021 11:36:50 GMT",
"version": "v3"
}
] | 2021-11-01 | [
[
"Henke",
"Christian",
""
]
] | The well-known brane world model of cosmology is an alternative to the standard model of cosmology, called {\Lambda}CDM (Lambda Cold Dark Matter) model. However, the quadratical energy density of the brane universe requires an undesirable fine tuning. The paper develops a new Anti-de Sitter (AdS) brane world model with... |
gr-qc/0112033 | Sanjay M. Wagh | S. M. Wagh, R. V. Saraykar, P. S. Muktibodh and K. S. Govinder | Conformal Killing Vectors in Spherically Symmetric, Inhomogeneous,
Shear-free, Separable Metric Spacetimes | submitted to Classical and Quantum Gravity | null | null | null | gr-qc | null | In this paper, we find all the Conformal Killing Vectors (CKVs) and their Lie
Algebra for the recently reported [cqg1] spherically symmetric, shear-free
separable metric spacetimes with non-vanishing energy or heat flux. We also
solve the geodesic equatios of motion for the spacetime under consideration.
| [
{
"created": "Sun, 16 Dec 2001 03:36:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wagh",
"S. M.",
""
],
[
"Saraykar",
"R. V.",
""
],
[
"Muktibodh",
"P. S.",
""
],
[
"Govinder",
"K. S.",
""
]
] | In this paper, we find all the Conformal Killing Vectors (CKVs) and their Lie Algebra for the recently reported [cqg1] spherically symmetric, shear-free separable metric spacetimes with non-vanishing energy or heat flux. We also solve the geodesic equatios of motion for the spacetime under consideration. |
1401.0473 | Sante Carloni Dr | Sante Carloni, Stefano Vignolo and Roberto Cianci | Non minimally coupled condensate cosmologies: a phase space analysis | 25 pages, 4 figures, submitted to Classical and Quantum Gravity | Class.Quant.Grav. 31 (2014) 185007 | 10.1088/0264-9381/31/18/185007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis of the phase space of cosmological models based on a
non minimal coupling between the geometry and a fermionic condensate. We obtain
that the strong constraint coming from the Dirac equations allows a detailed
design of the cosmology of these models and at the same time guarantees an
evolution ... | [
{
"created": "Thu, 2 Jan 2014 17:07:46 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Mar 2014 08:00:02 GMT",
"version": "v2"
}
] | 2018-04-20 | [
[
"Carloni",
"Sante",
""
],
[
"Vignolo",
"Stefano",
""
],
[
"Cianci",
"Roberto",
""
]
] | We present an analysis of the phase space of cosmological models based on a non minimal coupling between the geometry and a fermionic condensate. We obtain that the strong constraint coming from the Dirac equations allows a detailed design of the cosmology of these models and at the same time guarantees an evolution to... |
gr-qc/9910029 | Jiri Podolsky | J. Podolsky | The structure of the extreme Schwarzschild-de Sitter space-time | 19 pages, 10 figures, LaTeX, to appear in Gen. Rel. Grav | Gen.Rel.Grav. 31 (1999) 1703-1725 | 10.1023/A:1026762116655 | null | gr-qc | null | The extreme Schwarzschild-de Sitter space-time is a spherically symmetric
solution of Einstein's equations with a cosmological constant Lambda and mass
parameter m>0 which is characterized by the condition that 9 Lambda m^2=1. The
global structure of this space-time is here analyzed in detail. Conformal and
embedding... | [
{
"created": "Fri, 8 Oct 1999 14:54:07 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Podolsky",
"J.",
""
]
] | The extreme Schwarzschild-de Sitter space-time is a spherically symmetric solution of Einstein's equations with a cosmological constant Lambda and mass parameter m>0 which is characterized by the condition that 9 Lambda m^2=1. The global structure of this space-time is here analyzed in detail. Conformal and embedding d... |
2407.17335 | Grigoris Panotopoulos | G. Panotopoulos, A. Rincon and I. Lopes | Anisotropic Dark Energy Stars within Vanishing Complexity Factor
Formalism: Hydrostatic Equilibrium, Radial Oscillations, and Observational
Implications | 14 pages, 1 table, 4 figures; To appear in PLB | null | null | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the structure and radial oscillations of anisotropic compact
stars composed of dark energy, using the vanishing complexity factor formalism
within general relativity. This novel approach establishes a direct link
between the energy density and anisotropic factor, providing a robust framework
for studyi... | [
{
"created": "Wed, 24 Jul 2024 15:00:12 GMT",
"version": "v1"
}
] | 2024-07-25 | [
[
"Panotopoulos",
"G.",
""
],
[
"Rincon",
"A.",
""
],
[
"Lopes",
"I.",
""
]
] | We investigate the structure and radial oscillations of anisotropic compact stars composed of dark energy, using the vanishing complexity factor formalism within general relativity. This novel approach establishes a direct link between the energy density and anisotropic factor, providing a robust framework for studying... |
2306.16459 | Sam Dolan Dr | Sam R Dolan and Leanne Durkan and Chris Kavanagh and Barry Wardell | Metric perturbations of Kerr spacetime in Lorenz gauge: Circular
equatorial orbits | 89 pages, 16 figures. Accepted version (CQG), revised following peer
review. Mathematica code available on request | Class. Quantum Grav. 41, 155011 (2024) | 10.1088/1361-6382/ad52e3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the metric perturbation in Lorenz gauge for a compact body on a
circular equatorial orbit of a rotating black hole (Kerr) spacetime, using a
newly-developed method of separation of variables. The metric perturbation is
formed from a linear sum of differential operators acting on Teukolsky mode
functions,... | [
{
"created": "Wed, 28 Jun 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 11:30:29 GMT",
"version": "v2"
},
{
"created": "Sat, 1 Jun 2024 09:51:18 GMT",
"version": "v3"
}
] | 2024-07-10 | [
[
"Dolan",
"Sam R",
""
],
[
"Durkan",
"Leanne",
""
],
[
"Kavanagh",
"Chris",
""
],
[
"Wardell",
"Barry",
""
]
] | We construct the metric perturbation in Lorenz gauge for a compact body on a circular equatorial orbit of a rotating black hole (Kerr) spacetime, using a newly-developed method of separation of variables. The metric perturbation is formed from a linear sum of differential operators acting on Teukolsky mode functions, a... |
1810.00040 | Sean McWilliams | Sean T. McWilliams | Analytical Black-Hole Binary Merger Waveforms | Replaced with version accepted to PRL. Includes Supplementary
Material with additional content, in particular an illustration of the
physical merger model, that was requested by the referees | Phys. Rev. Lett. 122, 191102 (2019) | 10.1103/PhysRevLett.122.191102 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a highly accurate, fully analytical model for the late inspiral,
merger, and ringdown of black-hole binaries with arbitrary mass ratios and spin
vectors, including the contributions of harmonics beyond the fundamental mode.
This model assumes only that nonlinear effects remain small throughout the
entire c... | [
{
"created": "Fri, 28 Sep 2018 18:48:24 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2019 23:54:40 GMT",
"version": "v2"
}
] | 2019-05-22 | [
[
"McWilliams",
"Sean T.",
""
]
] | We present a highly accurate, fully analytical model for the late inspiral, merger, and ringdown of black-hole binaries with arbitrary mass ratios and spin vectors, including the contributions of harmonics beyond the fundamental mode. This model assumes only that nonlinear effects remain small throughout the entire coa... |
2306.01964 | Marcelo Maciel Amaral | Marcelo Amaral, Richard Clawson and Klee Irwin | Quasicrystalline Spin Foam with Matter: Definitions and Examples | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we define quasicrystalline spin networks as a subspace within
the standard Hilbert space of loop quantum gravity, effectively constraining
the states to coherent states that align with quasicrystal geometry structures.
We introduce quasicrystalline spin foam amplitudes, a variation of the EPRL
spin foam... | [
{
"created": "Sat, 3 Jun 2023 00:17:06 GMT",
"version": "v1"
}
] | 2023-06-06 | [
[
"Amaral",
"Marcelo",
""
],
[
"Clawson",
"Richard",
""
],
[
"Irwin",
"Klee",
""
]
] | In this work, we define quasicrystalline spin networks as a subspace within the standard Hilbert space of loop quantum gravity, effectively constraining the states to coherent states that align with quasicrystal geometry structures. We introduce quasicrystalline spin foam amplitudes, a variation of the EPRL spin foam m... |
gr-qc/9704061 | Asher Peres | Asher Peres | Critique of the Wheeler-DeWitt equation | 13 pages LaTeX, one figure. It is stressed that the critique is not
general, but only aimed at the use of the WDW equation for minisuperspaces | null | 10.1007/978-1-4612-1422-9_26 | null | gr-qc quant-ph | null | The Wheeler-DeWitt equation is based on the use of canonical quantization
rules that may be inconsistent for constrained dynamical systems, such as
minisuperspaces subject to Einstein's equations. The resulting quantum dynamics
has no classical limit and it suffers from the infamous ``problem of time.'' In
this artic... | [
{
"created": "Wed, 23 Apr 1997 11:30:16 GMT",
"version": "v1"
},
{
"created": "Fri, 23 May 1997 07:58:46 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Peres",
"Asher",
""
]
] | The Wheeler-DeWitt equation is based on the use of canonical quantization rules that may be inconsistent for constrained dynamical systems, such as minisuperspaces subject to Einstein's equations. The resulting quantum dynamics has no classical limit and it suffers from the infamous ``problem of time.'' In this article... |
1608.06509 | Sudipto Bhattacharjee | Sudipto Bhattacharjee, Subhajit Saha, and Subenoy Chakraborty | Does the particle creation mechanism favour the formation of a black
hole or a naked singularity? | 17 pages, 6 figures,and 3 tables | The European Physical Journal C 78, 488 (2018) | 10.1140/epjc/s10052-018-5965-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with collapse dynamics of a spherically symmetric massive
star in the framework of non-equilibrium themodynamic prescription through
particle creation mechanism. The matter content in the star is in the form of
perfect uid with barotropic equation of state and the dissipative phenomena due
to non-equi... | [
{
"created": "Mon, 22 Aug 2016 09:51:55 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2016 11:38:01 GMT",
"version": "v2"
}
] | 2021-01-26 | [
[
"Bhattacharjee",
"Sudipto",
""
],
[
"Saha",
"Subhajit",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The paper deals with collapse dynamics of a spherically symmetric massive star in the framework of non-equilibrium themodynamic prescription through particle creation mechanism. The matter content in the star is in the form of perfect uid with barotropic equation of state and the dissipative phenomena due to non-equili... |
2005.05472 | Carl-Johan Haster | Carl-Johan Haster | Pi from the sky -- A null test of general relativity from a population
of gravitational wave observations | 8 pages, 5 figures | null | null | LIGO-P2000159 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our understanding of observed Gravitational Waves (GWs) comes from matching
data to known signal models describing General Relativity (GR). These models,
expressed in the post-Newtonian formalism, contain the mathematical constant
$\pi$. Allowing $\pi$ to vary thus enables a strong, universal and
generalisable null t... | [
{
"created": "Mon, 11 May 2020 22:43:49 GMT",
"version": "v1"
}
] | 2020-05-13 | [
[
"Haster",
"Carl-Johan",
""
]
] | Our understanding of observed Gravitational Waves (GWs) comes from matching data to known signal models describing General Relativity (GR). These models, expressed in the post-Newtonian formalism, contain the mathematical constant $\pi$. Allowing $\pi$ to vary thus enables a strong, universal and generalisable null tes... |
0708.0521 | Frank Reifler | Frank Reifler and Randall Morris | Measuring a Kaluza-Klein radius smaller than the Planck length | null | Phys.Rev.D67:064006,2003 | 10.1103/PhysRevD.67.064006 | null | gr-qc astro-ph quant-ph | null | Hestenes has shown that a bispinor field on a Minkowski space-time is
equivalent to an orthonormal tetrad of one-forms together with a complex scalar
field. More recently, the Dirac and Einstein equations were unified in a tetrad
formulation of a Kaluza-Klein model which gives precisely the usual
Dirac-Einstein Lagra... | [
{
"created": "Fri, 3 Aug 2007 14:15:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Reifler",
"Frank",
""
],
[
"Morris",
"Randall",
""
]
] | Hestenes has shown that a bispinor field on a Minkowski space-time is equivalent to an orthonormal tetrad of one-forms together with a complex scalar field. More recently, the Dirac and Einstein equations were unified in a tetrad formulation of a Kaluza-Klein model which gives precisely the usual Dirac-Einstein Lagrang... |
1111.6468 | Maarten van de Meent | Maarten van de Meent | Piecewise Flat Gravity in 3+1 dimensions | PhD thesis, Utrecht University | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a model for gravity in 3+1 dimensions, inspired in general
relativity in 2+1 dimensions. In contrast regular general relativity in 3+1
dimensions, the model postulates that space in absence of matter is flat. The
requirement that the Einstein equation still holds for the complete spacetime,
implies that matt... | [
{
"created": "Mon, 28 Nov 2011 15:16:58 GMT",
"version": "v1"
}
] | 2011-11-29 | [
[
"van de Meent",
"Maarten",
""
]
] | We study a model for gravity in 3+1 dimensions, inspired in general relativity in 2+1 dimensions. In contrast regular general relativity in 3+1 dimensions, the model postulates that space in absence of matter is flat. The requirement that the Einstein equation still holds for the complete spacetime, implies that matter... |
gr-qc/9503012 | Kostas Kokkotas | Yasufumi Kojima, Nils Andersson and Kostas D. Kokkotas | ON THE OSCILLATION SPECTRA OF ULTRA COMPACT STARS | 13 pages, LATEX format, 25Kb, 2 postscript figures, Proc. Roy. Soc.
London in press | Proc.Roy.Soc.Lond. 451 (1995) 341 | 10.1098/rspa.1995.0129 | null | gr-qc | null | Quasinormal modes of ultra compact stars with uniform energy density have
been calculated. For less compact stars, there is only one very slowly damped
polar mode (corresponding to the Kelvin f-mode) for each spherical harmonic
index $l$. Further long-lived modes become possible for a sufficiently compact
star (rough... | [
{
"created": "Tue, 7 Mar 1995 12:26:34 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kojima",
"Yasufumi",
""
],
[
"Andersson",
"Nils",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | Quasinormal modes of ultra compact stars with uniform energy density have been calculated. For less compact stars, there is only one very slowly damped polar mode (corresponding to the Kelvin f-mode) for each spherical harmonic index $l$. Further long-lived modes become possible for a sufficiently compact star (roughly... |
gr-qc/0402052 | Luis Herrera | L. Herrera | Geodesics in a quasispherical spacetime: A case of gravitational
repulsion | 30 pages latex | Found.Phys.Lett. 18 (2005) 21-36 | 10.1007/s10702-005-2467-7 | null | gr-qc astro-ph | null | Geodesics are studied in one of the Weyl metrics, referred to as the M--Q
solution. First, arguments are provided, supporting our belief that this
space--time is the more suitable (among the known solutions of the Weyl family)
for discussing the properties of strong quasi--spherical gravitational fields.
Then, the be... | [
{
"created": "Wed, 11 Feb 2004 20:19:53 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jul 2004 19:22:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Herrera",
"L.",
""
]
] | Geodesics are studied in one of the Weyl metrics, referred to as the M--Q solution. First, arguments are provided, supporting our belief that this space--time is the more suitable (among the known solutions of the Weyl family) for discussing the properties of strong quasi--spherical gravitational fields. Then, the beha... |
0704.1136 | Ernesto F. Eiroa | Ernesto F. Eiroa, Claudio Simeone | Stability of Chaplygin gas thin-shell wormholes | 14 pages, 5 figures; v2: minor changes and new references added.
Accepted for publication in Physical Review D | Phys.Rev.D76:024021,2007 | 10.1103/PhysRevD.76.024021 | null | gr-qc | null | In this paper we construct spherical thin-shell wormholes supported by a
Chaplygin gas. For a rather general class of geometries we introduce a new
approach for the stability analysis of static solutions under perturbations
preserving the symmetry. We apply this to wormholes constructed from
Schwarzschild, Schwarzsch... | [
{
"created": "Mon, 9 Apr 2007 17:26:26 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2007 17:04:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"Simeone",
"Claudio",
""
]
] | In this paper we construct spherical thin-shell wormholes supported by a Chaplygin gas. For a rather general class of geometries we introduce a new approach for the stability analysis of static solutions under perturbations preserving the symmetry. We apply this to wormholes constructed from Schwarzschild, Schwarzschil... |
1803.01722 | Rajnish Singh | E. V. Arbuzova, A. D. Dolgov, R. S. Singh | Distortion of the standard cosmology in R+R^2 theory | 22 pages, 10 figures. Figure captions are corrected to match the
graph colours | null | 10.1088/1475-7516/2018/07/019 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Universe history in $R^2$-gravity is studied from "beginning" up to the
present epoch. It is assumed that initially the curvature scalar $R$ was
sufficiently large to induce the proper duration of inflation. Gravitational
particle production by the oscillating $R(t)$ led to a graceful exit from
inflation, but the cos... | [
{
"created": "Fri, 2 Mar 2018 15:13:43 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2018 07:41:27 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Nov 2018 06:52:52 GMT",
"version": "v3"
}
] | 2018-11-27 | [
[
"Arbuzova",
"E. V.",
""
],
[
"Dolgov",
"A. D.",
""
],
[
"Singh",
"R. S.",
""
]
] | Universe history in $R^2$-gravity is studied from "beginning" up to the present epoch. It is assumed that initially the curvature scalar $R$ was sufficiently large to induce the proper duration of inflation. Gravitational particle production by the oscillating $R(t)$ led to a graceful exit from inflation, but the cosmo... |
1109.0140 | Fabrizio Tamburini | F. Tamburini (1) and B.Thid\'E (2) ((1) Department of Astronomy,
University of Padova, vicolo dell' Osservatorio 3, Padova, Italy (2) Swedish
Institute of Space Physics, Physics in Space, Angstr\"om Laboratory, Sweden) | Photon Orbital Angular Momentum and Proca effects in rotating and
charged spacetimes | 4 pages | null | null | null | gr-qc astro-ph.HE quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the effect of Proca mass and orbital angular momentum of photons
imposed by a structured plasma in Kerr-Newman and Reissner-Nordstrom-de Sitter
spacetimes. The presence of characteristic lengths in a turbulent plasma
converts the virtual Proca photon mass on orbital angular momentum, with the
result of dec... | [
{
"created": "Thu, 1 Sep 2011 10:07:49 GMT",
"version": "v1"
}
] | 2011-09-02 | [
[
"Tamburini",
"F.",
""
],
[
"ThidÉ",
"B.",
""
]
] | We analyze the effect of Proca mass and orbital angular momentum of photons imposed by a structured plasma in Kerr-Newman and Reissner-Nordstrom-de Sitter spacetimes. The presence of characteristic lengths in a turbulent plasma converts the virtual Proca photon mass on orbital angular momentum, with the result of decre... |
gr-qc/9711021 | Roberto De Pietri | Roberto De Pietri (Penn State U. and Parma U.) | The Equivalence between the Connection and the Loop Representation of
Quantum Gravity | 3 pages, LaTeX (epsfig,mprocl-1 eps figure included). To appear in
the Proceedings of the 8th Marcell Grossman Meeting - Jerusalem June 1997 | null | null | CGPG-97/11-1 and University of Parma UPRF-97-13 | gr-qc | null | The recent developments of the ``connection'' and ``loop'' representations
have given the possibility to show that the two representation are equivalent
and that it is possible to transform any result from one representation into
the other. The glue between the two representations is the loop transform. Its
use, comb... | [
{
"created": "Thu, 6 Nov 1997 15:24:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"De Pietri",
"Roberto",
"",
"Penn State U. and Parma U."
]
] | The recent developments of the ``connection'' and ``loop'' representations have given the possibility to show that the two representation are equivalent and that it is possible to transform any result from one representation into the other. The glue between the two representations is the loop transform. Its use, combin... |
gr-qc/0605015 | Hamid Reza Sepangi | B. Vakili, S. Jalalzadeh and H. R. Sepangi | Compactification and signature transition in Kaluza-Klein spinor
cosmology | 12 pages, 1 figure, to appear in Annals of Physics | Annals Phys.321:2491-2503,2006 | 10.1016/j.aop.2006.04.016 | null | gr-qc hep-th | null | We study the classical and quantum cosmology of a 4+1-dimensional space-time
with a non-zero cosmological constant coupled to a self interacting massive
spinor field. We consider a spatially flat Robertson-Walker universe with the
usual scale factor $R(t)$ and an internal scale factor $a(t)$ associated with
the extra... | [
{
"created": "Tue, 2 May 2006 06:59:23 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Vakili",
"B.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We study the classical and quantum cosmology of a 4+1-dimensional space-time with a non-zero cosmological constant coupled to a self interacting massive spinor field. We consider a spatially flat Robertson-Walker universe with the usual scale factor $R(t)$ and an internal scale factor $a(t)$ associated with the extra d... |
gr-qc/0011013 | Bahram Mashhoon | Bahram Mashhoon | Relativity and Nonlocality | LaTeX file, no figures, 12 pages, Plenary talk given at EREs2000
(Valladolid, Spain, 6-9 September 2000); to be published in Proc. Spanish
Relativity Meeting, edited by J.-F. Pascual-S\'anchez, L. Flor\'\ia, A. San
Miguel, and F. Vicente (World Scientific, 2001) | null | 10.1142/9789812810021_0010 | null | gr-qc | null | The basic physical structure of the relativistic theory of gravitation is
discussed. The significant role that the Hypothesis of Locality plays in
relativity theory is elucidated via the phenomenon of spin-rotation coupling.
The limitations of this hypothesis are critically examined. A nonlocal theory
of accelerated ... | [
{
"created": "Fri, 3 Nov 2000 22:50:25 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Nov 2000 03:27:15 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Mashhoon",
"Bahram",
""
]
] | The basic physical structure of the relativistic theory of gravitation is discussed. The significant role that the Hypothesis of Locality plays in relativity theory is elucidated via the phenomenon of spin-rotation coupling. The limitations of this hypothesis are critically examined. A nonlocal theory of accelerated ob... |
gr-qc/9610055 | Ichiro Oda | Akio Hosoya and Ichiro Oda | Black Hole Radiation inside Apparent Horizon in Quantum Gravity | 13 pages, phyzzx | Prog.Theor.Phys. 97 (1997) 233-242 | 10.1143/PTP.97.233 | EDO-EP-7 | gr-qc | null | We study a black hole radiation inside the apparent horizon in quantum
gravity. First we perform a canonical quantization for spherically symmetric
geometry where one of the spatial coordinates is dealt as the time variable
since we would like to consider the interior region of a black hole. Next this
rather general ... | [
{
"created": "Thu, 24 Oct 1996 07:01:41 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Hosoya",
"Akio",
""
],
[
"Oda",
"Ichiro",
""
]
] | We study a black hole radiation inside the apparent horizon in quantum gravity. First we perform a canonical quantization for spherically symmetric geometry where one of the spatial coordinates is dealt as the time variable since we would like to consider the interior region of a black hole. Next this rather general fo... |
1301.5900 | Christian Corda cordac | Christian Corda | Cosmology and gravitational waves in the Nordstrom-Vlasov system, a
laboratory for Dark Energy | 11 pages, invited contribution accepted for publication by New Adv.
Phys. To appear in Issue 7(1) 2013 on Dark Energy | New Advances in Physics, Vol. 7, No. 1, January-June 2013, Pp.
85-96 | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a cosmological solution of the system which was originally
introduced by Calogero and is today popularly known as "Nordstrom-Vlasov
system". Although the model is un-physical, its cosmological solution results
interesting for the same reasons for which the Nordstrom-Vlasov system was
originally introduced ... | [
{
"created": "Thu, 24 Jan 2013 13:35:59 GMT",
"version": "v1"
}
] | 2014-03-03 | [
[
"Corda",
"Christian",
""
]
] | We discuss a cosmological solution of the system which was originally introduced by Calogero and is today popularly known as "Nordstrom-Vlasov system". Although the model is un-physical, its cosmological solution results interesting for the same reasons for which the Nordstrom-Vlasov system was originally introduced in... |
2307.03963 | Gaurav Khanna | Stefanos Aretakis, Gaurav Khanna and Subir Sabharwal | An observational signature for extremal black holes | 8 pages, 5 figures; additional numerical analysis and many
improvements to presentation | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider scalar perturbations of the Reissner--Nordstr\"{o}m family and
the Kerr family. We derive a characteristic expression of the radiation field,
at any given unit solid angle of future null infinity, and numerically show
that its amplitude gets excited only in the extremal case. Our work, therefore,
identifi... | [
{
"created": "Sat, 8 Jul 2023 12:25:17 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jan 2024 23:26:09 GMT",
"version": "v2"
}
] | 2024-01-23 | [
[
"Aretakis",
"Stefanos",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Sabharwal",
"Subir",
""
]
] | We consider scalar perturbations of the Reissner--Nordstr\"{o}m family and the Kerr family. We derive a characteristic expression of the radiation field, at any given unit solid angle of future null infinity, and numerically show that its amplitude gets excited only in the extremal case. Our work, therefore, identifies... |
gr-qc/0104098 | Hai Lin | Hai Lin | A Proposed Absolute Entropy of Near Extremal Kerr-Newman Black Hole | 9 pages, LaTex; v2: more referrences added | null | null | null | gr-qc | null | Some problems have been found as to the definition of entropy of black hole
being applied to the extremal Kerr-Newman case, which has conflicts with the
third law of thermodynamics. We have proposed a new modification for the near
extremal one, which not only obeys the third law, but also does not conflict
with other... | [
{
"created": "Sun, 29 Apr 2001 19:52:07 GMT",
"version": "v1"
},
{
"created": "Sun, 6 May 2001 15:05:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Lin",
"Hai",
""
]
] | Some problems have been found as to the definition of entropy of black hole being applied to the extremal Kerr-Newman case, which has conflicts with the third law of thermodynamics. We have proposed a new modification for the near extremal one, which not only obeys the third law, but also does not conflict with other r... |
0805.3960 | Keiko Kokeyama | K. Kokeyama, K. Somiya, F. Kawazoe, S. Sato, S. Kawamura and A.
Sugamoto | Development of signal-extraction scheme for Resonant Sideband Extraction | 8 pages, 6 figures, 2 tables | Class.Quant.Grav.25:235013,2008 | 10.1088/0264-9381/25/23/235013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a future plan, an advanced gravitational-wave detector will employ an
optical configuration of resonant sideband extraction (RSE), achieved with an
additional mirror at the signal-detection port of the power-recycled
Fabry-Perot Michelson interferometer. To control the complex coupled cavity
system, one of the mos... | [
{
"created": "Mon, 26 May 2008 14:05:55 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Kokeyama",
"K.",
""
],
[
"Somiya",
"K.",
""
],
[
"Kawazoe",
"F.",
""
],
[
"Sato",
"S.",
""
],
[
"Kawamura",
"S.",
""
],
[
"Sugamoto",
"A.",
""
]
] | As a future plan, an advanced gravitational-wave detector will employ an optical configuration of resonant sideband extraction (RSE), achieved with an additional mirror at the signal-detection port of the power-recycled Fabry-Perot Michelson interferometer. To control the complex coupled cavity system, one of the most ... |
1609.02677 | Takayoshi Ootsuka | Takayoshi Ootsuka, Ryoko Yahagi, Muneyuki Ishida | Killing Symmetry on Finsler Manifold | 12 pages | null | 10.1088/1361-6382/aa64b1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Killing vector fields $K$ are defined on Finsler manifold. The Killing
symmetry is reformulated simply as $\delta K^\flat =0$ by using the Killing
non-linear 1-form $K^\flat$ and the spray operator $\delta$ with the Finsler
non-linear connection. $K^\flat$ is related to the generalization of Killing
tensors on Finsle... | [
{
"created": "Fri, 9 Sep 2016 07:51:27 GMT",
"version": "v1"
}
] | 2017-04-19 | [
[
"Ootsuka",
"Takayoshi",
""
],
[
"Yahagi",
"Ryoko",
""
],
[
"Ishida",
"Muneyuki",
""
]
] | Killing vector fields $K$ are defined on Finsler manifold. The Killing symmetry is reformulated simply as $\delta K^\flat =0$ by using the Killing non-linear 1-form $K^\flat$ and the spray operator $\delta$ with the Finsler non-linear connection. $K^\flat$ is related to the generalization of Killing tensors on Finsler ... |
2105.09094 | Willians Barreto | M. A. Alcoforado, R. F. Aranha, W. O. Barreto, H. P. de Oliveira | New numerical framework for the generalized
Baumgarte-Shapiro-Shibata-Nakamura formulation: The vacuum case for spherical
symmetry | 10 pages, 5 figures. To appear in PRD | Phys. Rev. D 104, 084065 (2021) | 10.1103/PhysRevD.104.084065 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Here we report a developed high performance and simplified version of the
code denominated RIO, which can be easily extended, for the generalized BSSN
formulation. We implement a code which is regular at the center of symmetry,
without use a special procedure for regularization, as usual. We get
exponential convergen... | [
{
"created": "Wed, 19 May 2021 12:35:02 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2021 17:53:02 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Sep 2021 19:51:51 GMT",
"version": "v3"
}
] | 2021-10-19 | [
[
"Alcoforado",
"M. A.",
""
],
[
"Aranha",
"R. F.",
""
],
[
"Barreto",
"W. O.",
""
],
[
"de Oliveira",
"H. P.",
""
]
] | Here we report a developed high performance and simplified version of the code denominated RIO, which can be easily extended, for the generalized BSSN formulation. We implement a code which is regular at the center of symmetry, without use a special procedure for regularization, as usual. We get exponential convergence... |
2306.13396 | Waleed El Hanafy | G. G. L. Nashed and Waleed El Hanafy | Constraining Quadratic $f(R)$ Gravity from Astrophysical Observations of
the Pulsar J0704+6620 | 18 pages, 9 figures and one table | null | null | null | gr-qc astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | We apply quadratic $f(R)=R+\epsilon R^2$ field equations, where $\epsilon$
has a dimension [L$^2$], to static spherical stellar model. We assume the
interior configuration is determined by Krori-Barua ansatz and additionally the
fluid is anisotropic. Using the astrophysical measurements of the pulsar PSR
J0740+6620 a... | [
{
"created": "Fri, 23 Jun 2023 09:25:44 GMT",
"version": "v1"
}
] | 2023-06-26 | [
[
"Nashed",
"G. G. L.",
""
],
[
"Hanafy",
"Waleed El",
""
]
] | We apply quadratic $f(R)=R+\epsilon R^2$ field equations, where $\epsilon$ has a dimension [L$^2$], to static spherical stellar model. We assume the interior configuration is determined by Krori-Barua ansatz and additionally the fluid is anisotropic. Using the astrophysical measurements of the pulsar PSR J0740+6620 as ... |
1505.06023 | Fay\c{c}al Hammad | Fay\c{c}al Hammad | Radiative Corrections in the (Varying Power)-Law Modified Gravity | 7 pages & 2 figures. Matches the accepted version | Phys. Rev. D 91, 124027 (2015) | 10.1103/PhysRevD.91.124027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although the (varying power)-law modified gravity toy model has the
attractive feature of unifying the early and late-time expansions of the
Universe, thanks to the peculiar dependence of the scalar field's potential on
the scalar curvature, the model still suffers from the fine-tuning problem when
used to explain th... | [
{
"created": "Fri, 22 May 2015 10:43:08 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2015 23:28:24 GMT",
"version": "v2"
},
{
"created": "Sat, 19 Dec 2015 19:46:34 GMT",
"version": "v3"
}
] | 2015-12-22 | [
[
"Hammad",
"Fayçal",
""
]
] | Although the (varying power)-law modified gravity toy model has the attractive feature of unifying the early and late-time expansions of the Universe, thanks to the peculiar dependence of the scalar field's potential on the scalar curvature, the model still suffers from the fine-tuning problem when used to explain the ... |
2405.18303 | Taillte May | Taillte May, Sizheng Ma, Justin L. Ripley, William E. East | Nonlinear effect of absorption on the ringdown of a spinning black hole | 29 pages, 16 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ringdown gravitational wave signal arising e.g., in the final stage of a
black hole binary merger, contains important information about the properties
of the remnant, and can potentially be used to perform clean tests of general
relativity. However, interpreting the ringdown signal, in particular when it is
the l... | [
{
"created": "Tue, 28 May 2024 15:58:19 GMT",
"version": "v1"
}
] | 2024-05-29 | [
[
"May",
"Taillte",
""
],
[
"Ma",
"Sizheng",
""
],
[
"Ripley",
"Justin L.",
""
],
[
"East",
"William E.",
""
]
] | The ringdown gravitational wave signal arising e.g., in the final stage of a black hole binary merger, contains important information about the properties of the remnant, and can potentially be used to perform clean tests of general relativity. However, interpreting the ringdown signal, in particular when it is the lou... |
0706.2396 | Vitaly Noskov | Vitaly Noskov | Model of embedded spaces: the field equations | 9 pages, 0 figures, to be published in "Gravitation&Cosmology" Vol.
13(2007) | Grav.Cosmol.13:127-132,2007 | null | null | gr-qc | null | A study of the Model of Embedded Spaces (MES) with a relativistic version of
Finslerian geometry is continued. The field equations of the MES (Einstein and
Maxwell types) are derived, and this formally completes geometrization of
classical electrodynamics. The minimal action principle leads to geometrization
of the f... | [
{
"created": "Sat, 16 Jun 2007 03:31:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Noskov",
"Vitaly",
""
]
] | A study of the Model of Embedded Spaces (MES) with a relativistic version of Finslerian geometry is continued. The field equations of the MES (Einstein and Maxwell types) are derived, and this formally completes geometrization of classical electrodynamics. The minimal action principle leads to geometrization of the fie... |
2406.08410 | Peter James Nee Mr. | Peter James Nee, Guillermo Lara, Harald P. Pfeiffer, Nils L. Vu | Quasistationary hair for binary black hole initial data in scalar
Gauss-Bonnet gravity | 13 pages, 11 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent efforts to numerically simulate compact objects in alternative
theories of gravity have largely focused on the time-evolution equations.
Another critical aspect is the construction of constraint-satisfying initial
data with precise control over the properties of the systems under
consideration. Here, we augmen... | [
{
"created": "Wed, 12 Jun 2024 16:56:45 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Nee",
"Peter James",
""
],
[
"Lara",
"Guillermo",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
"Vu",
"Nils L.",
""
]
] | Recent efforts to numerically simulate compact objects in alternative theories of gravity have largely focused on the time-evolution equations. Another critical aspect is the construction of constraint-satisfying initial data with precise control over the properties of the systems under consideration. Here, we augment ... |
1404.1045 | William Almonacid-Guerrero | William Almonacid | The Two Extended Bodies Problem in General Relativity within the
post-Newtonian Approximation | M.Sc. Thesis (in Spanish) defended at Universidad Nacional de
Colombia (Bogot\'a, Colombia, Noviembre - 2013). 101 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of extended bodies is a fundamental problem in any gravitational
theory. In the case of General Relativity, this problem is under study since
the theory was published. Several methods have been developed and different
approaches are avalaible in the literature to interpret the relativistic
contributions ... | [
{
"created": "Wed, 2 Apr 2014 00:21:44 GMT",
"version": "v1"
}
] | 2014-04-04 | [
[
"Almonacid",
"William",
""
]
] | The dynamics of extended bodies is a fundamental problem in any gravitational theory. In the case of General Relativity, this problem is under study since the theory was published. Several methods have been developed and different approaches are avalaible in the literature to interpret the relativistic contributions in... |
2003.07519 | Kazumasa Okabayashi | Kazumasa Okabayashi, Nobuyuki Asaka, Ken-ichi Nakao | Do black hole shadows merge? | 11 pages, 7 figures, published version | Phys. Rev. D 102, 044011 (2020) | 10.1103/PhysRevD.102.044011 | OCU-PHYS-518, AP-GR-160, NITEP 64 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The so-called black hole shadow is not a silhouette of a black hole but an
image of a collapsing object or a white hole. Hence it is non-trivial whether
black hole shadows merge with each other when black holes coalesce with each
other. In this paper, by analyzing the null geodesic generators of the event
horizon in ... | [
{
"created": "Tue, 17 Mar 2020 04:13:07 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2020 09:15:22 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Aug 2020 14:24:27 GMT",
"version": "v3"
}
] | 2020-08-12 | [
[
"Okabayashi",
"Kazumasa",
""
],
[
"Asaka",
"Nobuyuki",
""
],
[
"Nakao",
"Ken-ichi",
""
]
] | The so-called black hole shadow is not a silhouette of a black hole but an image of a collapsing object or a white hole. Hence it is non-trivial whether black hole shadows merge with each other when black holes coalesce with each other. In this paper, by analyzing the null geodesic generators of the event horizon in Ka... |
gr-qc/0507094 | Robert M. Wald | Robert M. Wald | The Arrow of Time and the Initial Conditions of the Universe | 5 pages, no figures; write-up of talk given at Seven Pines "Arrows of
Time" meeting, December, 2004 | null | null | null | gr-qc | null | The existence of a thermodynamic arrow of time in the present universe
implies that the initial state of the observable portion of our universe at (or
near) the ``big bang'' must have been very ``special''. We argue that it is not
plausible that these special initial conditions have a dynamical origin.
| [
{
"created": "Thu, 21 Jul 2005 20:31:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wald",
"Robert M.",
""
]
] | The existence of a thermodynamic arrow of time in the present universe implies that the initial state of the observable portion of our universe at (or near) the ``big bang'' must have been very ``special''. We argue that it is not plausible that these special initial conditions have a dynamical origin. |
1802.00095 | Willians Barreto | W. O. Barreto, J. A. Crespo, H. P. de Oliveira and E. L. Rodrigues | A Galerkin-Collocation domain decomposition method: application to the
evolution of cylindrical gravitational waves | 20 pages, 8 figures. Accepted in Class. Quantum Grav | Class. Quantum Grav. 36 (2019) 215011 | 10.1088/1361-6382/ab4733 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a Galerkin-Collocation domain decomposition algorithm applied to
the evolution of cylindrical unpolarized gravitational waves. We show the
effectiveness of the algorithm in reproducing initial data with high localized
gradients and in providing highly accurate dynamics. We characterize the
gravitational ra... | [
{
"created": "Wed, 31 Jan 2018 23:06:03 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Nov 2018 13:05:13 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Sep 2019 13:46:09 GMT",
"version": "v3"
}
] | 2019-10-17 | [
[
"Barreto",
"W. O.",
""
],
[
"Crespo",
"J. A.",
""
],
[
"de Oliveira",
"H. P.",
""
],
[
"Rodrigues",
"E. L.",
""
]
] | We present a Galerkin-Collocation domain decomposition algorithm applied to the evolution of cylindrical unpolarized gravitational waves. We show the effectiveness of the algorithm in reproducing initial data with high localized gradients and in providing highly accurate dynamics. We characterize the gravitational radi... |
gr-qc/9911067 | Doc. Ing. Jozef Sima DRSc. | Miroslav Sukenik and Jozef Sima | A Mode of Unifying Gravitation and Strong Interactions Proposed by the
Model of Expansive Nondecelerative Universe | 3 pages, LaTex | null | null | SS-99-04 | gr-qc | null | The model of Expansive Nondecelerative Universe exploiting the Vaidya metrics
is used as a tool for unification of gravitation and strong interactions. The
proposed approach stems from the capability to localize the energy of
gravitational field and enables to reach a certain level in unifying the
general theory of r... | [
{
"created": "Thu, 18 Nov 1999 11:58:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sukenik",
"Miroslav",
""
],
[
"Sima",
"Jozef",
""
]
] | The model of Expansive Nondecelerative Universe exploiting the Vaidya metrics is used as a tool for unification of gravitation and strong interactions. The proposed approach stems from the capability to localize the energy of gravitational field and enables to reach a certain level in unifying the general theory of rel... |
1707.08911 | Robert van den Hoogen | B. Alhulaimi, R. J. van den Hoogen, A. A. Coley | Spatially Homogeneous Einstein-Aether Cosmological Models: Scalar Fields
with a Generalized Harmonic Potential | 34 pages, 25 figures, JCAP latex style | 2017 J. Cosmol. Astropart. Phys. 2017 045 | 10.1088/1475-7516/2017/12/045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inflationary spatially homogeneous cosmological models within an
Einstein-Aether gravitational framework are investigated. The matter source is
assumed to be a scalar field which is coupled to the aether field expansion and
shear scalars through the generalized harmonic scalar field potential. The
evolution equations... | [
{
"created": "Thu, 27 Jul 2017 15:47:05 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Alhulaimi",
"B.",
""
],
[
"Hoogen",
"R. J. van den",
""
],
[
"Coley",
"A. A.",
""
]
] | Inflationary spatially homogeneous cosmological models within an Einstein-Aether gravitational framework are investigated. The matter source is assumed to be a scalar field which is coupled to the aether field expansion and shear scalars through the generalized harmonic scalar field potential. The evolution equations a... |
0810.1534 | Richard Whisker | Richard Whisker | Braneworld Black Holes | PhD thesis, 139 pages, Nov 2006 (supervisor: Ruth Gregory) | null | null | 0001 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis we investigate black holes in the Randall-Sundrum braneworld
scenario. We begin with an overview of extra-dimensional physics, from the
original proposal of Kaluza and Klein up to the modern braneworld picture of
extra dimensions. A detailed description of braneworld gravity is given, with
particular e... | [
{
"created": "Wed, 8 Oct 2008 20:16:45 GMT",
"version": "v1"
}
] | 2008-10-10 | [
[
"Whisker",
"Richard",
""
]
] | In this thesis we investigate black holes in the Randall-Sundrum braneworld scenario. We begin with an overview of extra-dimensional physics, from the original proposal of Kaluza and Klein up to the modern braneworld picture of extra dimensions. A detailed description of braneworld gravity is given, with particular emp... |
gr-qc/0504069 | Sumati Surya | Fay Dowker and Sumati Surya | Observables in Extended Percolation Models of Causal Set Cosmology | 14 pages, 2 figures | Class.Quant.Grav. 23 (2006) 1381-1390 | 10.1088/0264-9381/23/4/018 | null | gr-qc | null | Classical sequential growth models for causal sets provide an important step
towards the formulation of a quantum causal set dynamics. The covariant
observables in a class of these models known as generalised percolation have
been completely characterised in terms of physically well-defined ``stem sets''
and yield an... | [
{
"created": "Fri, 15 Apr 2005 11:55:05 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Dowker",
"Fay",
""
],
[
"Surya",
"Sumati",
""
]
] | Classical sequential growth models for causal sets provide an important step towards the formulation of a quantum causal set dynamics. The covariant observables in a class of these models known as generalised percolation have been completely characterised in terms of physically well-defined ``stem sets'' and yield an i... |
2004.03367 | Ming Zhang | Ming Zhang and Jie Jiang | Escape probability of particle from Kerr-Sen black hole | 8 pages, 5 captioned figures, minor corrections | null | 10.1016/j.nuclphysb.2021.115313 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-sa/4.0/ | Assuming that a particle source is at rest in a locally non-rotating frame on
the equatorial plane of the Kerr-Sen black hole, we investigate the escape of
the massless particle and massive particle from the black hole to spatial
infinity. We calculate the escape probabilities of the emitted particles. We
find that t... | [
{
"created": "Tue, 7 Apr 2020 13:36:06 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2020 13:30:59 GMT",
"version": "v2"
}
] | 2021-02-24 | [
[
"Zhang",
"Ming",
""
],
[
"Jiang",
"Jie",
""
]
] | Assuming that a particle source is at rest in a locally non-rotating frame on the equatorial plane of the Kerr-Sen black hole, we investigate the escape of the massless particle and massive particle from the black hole to spatial infinity. We calculate the escape probabilities of the emitted particles. We find that the... |
2202.03693 | Gamal G.L. Nashed | Shin'ichi Nojiri and G.G.L. Nashed | Consistency between black hole and mimetic gravity -- Case of
$(2+1)$-dimensional gravity | 10 pages Accepted in PLB | null | 10.1016/j.physletb.2022.137140 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that the mimetic theory with the constraint $g^{\rho
\sigma}\partial_\rho\phi \partial_\sigma\phi=1$ cannot realize the black hole
geometry with the horizon(s). To overcome such issue, we may change the mimetic
constraint a little bit by $\omega(\phi) g^{\rho \sigma}\partial_\rho\phi
\partial_\sigma\phi=-1,$ ... | [
{
"created": "Tue, 8 Feb 2022 07:30:03 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Apr 2022 18:10:58 GMT",
"version": "v2"
}
] | 2022-05-25 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Nashed",
"G. G. L.",
""
]
] | We show that the mimetic theory with the constraint $g^{\rho \sigma}\partial_\rho\phi \partial_\sigma\phi=1$ cannot realize the black hole geometry with the horizon(s). To overcome such issue, we may change the mimetic constraint a little bit by $\omega(\phi) g^{\rho \sigma}\partial_\rho\phi \partial_\sigma\phi=-1,$ wh... |
1106.4620 | Nairwita Mazumder | Nairwita Mazumder, Ritabrata Biswas, Subenoy Chakraborty | FRW Cosmological model with Modified Chaplygin Gas and Dynamical System | 5 pages, 2 figures | null | 10.1007/s10773-012-1150-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Friedmann-Robertson-Walker(FRW) model with dynamical Dark Energy(DE) in
the form of modified Chaplygin gas(MCG) has been investigated. The evolution
equations are reduced to an autonomous system on the two dimensional phase
plane and it can be interpreted as the motion of the particle in an one
dimensional potent... | [
{
"created": "Thu, 23 Jun 2011 04:18:59 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Mazumder",
"Nairwita",
""
],
[
"Biswas",
"Ritabrata",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The Friedmann-Robertson-Walker(FRW) model with dynamical Dark Energy(DE) in the form of modified Chaplygin gas(MCG) has been investigated. The evolution equations are reduced to an autonomous system on the two dimensional phase plane and it can be interpreted as the motion of the particle in an one dimensional potentia... |
0904.1362 | Leonardo Fernandez-Jambrina | L. Fern\'andez-Jambrina, L.M. Gonz\'alez-Romero | New families of singularity-free cosmological models | 6 pp, published in ERE'03 proceedings | Gravitational Radiation. Eds: J.A. Miralles, J.A. Font, J.A. Pons.
Universidad de Alicante, Alicante, 83-88 (2004) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we extend a family of geodesically complete $G_{2}$ stiff fluid
cosmological models to the case in which the velocity of the fluid is not
orthogonal to the gradient of the transitivity surface element.
| [
{
"created": "Wed, 8 Apr 2009 15:14:56 GMT",
"version": "v1"
}
] | 2009-04-09 | [
[
"Fernández-Jambrina",
"L.",
""
],
[
"González-Romero",
"L. M.",
""
]
] | In this talk we extend a family of geodesically complete $G_{2}$ stiff fluid cosmological models to the case in which the velocity of the fluid is not orthogonal to the gradient of the transitivity surface element. |
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