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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9404007 | null | David Brown | Reference Fluids as Standards of Space and Time | (plain TeX, 3 pages) | null | null | null | gr-qc hep-th | null | The idea that spacetime points are to be identified by a fleet of
clock--carrying particles can be traced to the earliest days of general
relativity. Such a fleet of clocks can be described phenomenologically as a
reference fluid. One approach to the problem of time consists in coupling the
metric to a reference flui... | [
{
"created": "Wed, 6 Apr 1994 15:53:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brown",
"David",
""
]
] | The idea that spacetime points are to be identified by a fleet of clock--carrying particles can be traced to the earliest days of general relativity. Such a fleet of clocks can be described phenomenologically as a reference fluid. One approach to the problem of time consists in coupling the metric to a reference fluid ... |
1211.1855 | Mayeul Arminjon | Mayeul Arminjon | Should there be a spin-rotation coupling for a Dirac particle? | 29 pages in standard 12pt. V2: Introduction reinforced. New Section 3
on the dependences of the Hamiltonian on the reference frame and on the
tetrad field. New references | Int. J. Theor. Phys., Vol. 53, No. 6, pp. 1993-2013 (2014) | 10.1007/s10773-014-2006-z | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was argued by Mashhoon that a spin-rotation coupling term should add to
the Hamiltonian operator in a rotating frame, as compared with the one in an
inertial frame. For a Dirac particle, the Hamiltonian and energy operators H
and E were recently proved to depend on the tetrad field. We argue that this
non-uniquene... | [
{
"created": "Thu, 8 Nov 2012 14:08:09 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Sep 2013 14:03:19 GMT",
"version": "v2"
}
] | 2014-05-16 | [
[
"Arminjon",
"Mayeul",
""
]
] | It was argued by Mashhoon that a spin-rotation coupling term should add to the Hamiltonian operator in a rotating frame, as compared with the one in an inertial frame. For a Dirac particle, the Hamiltonian and energy operators H and E were recently proved to depend on the tetrad field. We argue that this non-uniqueness... |
2107.03258 | Bei Sha | Bei Sha and Zhi-E Liu | Lorentz-breaking Theory and Tunneling Radiation Correction to
Vaidya-Banner de Sitter Black Hole | 13 pages,0 figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Vaidya-Bonner de Sitter Black hole space-time, the tunneling radiation
characteristics of fermions and bosons are corrected by taking Lorentz symmetry
breaking theory into account. The corresponding gamma matrices and ether-like
field vectors of the black hole are constructed, then the new modified form of
Dirac e... | [
{
"created": "Wed, 7 Jul 2021 14:45:20 GMT",
"version": "v1"
}
] | 2021-07-08 | [
[
"Sha",
"Bei",
""
],
[
"Liu",
"Zhi-E",
""
]
] | In Vaidya-Bonner de Sitter Black hole space-time, the tunneling radiation characteristics of fermions and bosons are corrected by taking Lorentz symmetry breaking theory into account. The corresponding gamma matrices and ether-like field vectors of the black hole are constructed, then the new modified form of Dirac equ... |
2312.11358 | Harry Ho-Yin Ng | Harry Ho-Yin Ng, Jin-Liang Jiang, Carlo Musolino, Christian Ecker,
Samuel D.Tootle, Luciano Rezzolla | A hybrid approach to long-term binary neutron-star simulations | 25 pages, 13 figures | Phys. Rev. D (2024) 109, 064061 | 10.1103/PhysRevD.109.064061 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | One of the main challenges in the numerical modeling of binary neutron-star
(BNS) mergers is long-term simulations of the post-merger remnant over
timescales of the order of seconds. When this modeling includes all the aspects
of complex physics, the computational costs can easily become enormous. To
address this cha... | [
{
"created": "Mon, 18 Dec 2023 17:15:33 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2023 19:43:37 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Apr 2024 13:08:35 GMT",
"version": "v3"
}
] | 2024-04-11 | [
[
"Ng",
"Harry Ho-Yin",
""
],
[
"Jiang",
"Jin-Liang",
""
],
[
"Musolino",
"Carlo",
""
],
[
"Ecker",
"Christian",
""
],
[
"Tootle",
"Samuel D.",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | One of the main challenges in the numerical modeling of binary neutron-star (BNS) mergers is long-term simulations of the post-merger remnant over timescales of the order of seconds. When this modeling includes all the aspects of complex physics, the computational costs can easily become enormous. To address this chall... |
1801.01420 | Paolo Pani | Vitor Cardoso, \'Oscar J. C. Dias, Gavin S. Hartnett, Matthew
Middleton, Paolo Pani, Jorge E. Santos | Constraining the mass of dark photons and axion-like particles through
black-hole superradiance | 24 pages, 12 pages. Includes supplemental datafile | null | 10.1088/1475-7516/2018/03/043 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight bosons and axion-like particles appear naturally in different
scenarios and could solve some long-standing puzzles. Their detection is
challenging, and all direct methods hinge on unknown couplings to the Standard
Model of particle physics. However, the universal coupling to gravity provides
model-independ... | [
{
"created": "Thu, 4 Jan 2018 16:12:50 GMT",
"version": "v1"
}
] | 2018-04-11 | [
[
"Cardoso",
"Vitor",
""
],
[
"Dias",
"Óscar J. C.",
""
],
[
"Hartnett",
"Gavin S.",
""
],
[
"Middleton",
"Matthew",
""
],
[
"Pani",
"Paolo",
""
],
[
"Santos",
"Jorge E.",
""
]
] | Ultralight bosons and axion-like particles appear naturally in different scenarios and could solve some long-standing puzzles. Their detection is challenging, and all direct methods hinge on unknown couplings to the Standard Model of particle physics. However, the universal coupling to gravity provides model-independen... |
1301.3508 | Ahmed Farag Ali | Ahmed Farag Ali (Benha U.) and A. Tawfik (Egyptian Ctr. Theor. Phys.,
Cairo and Freie U., Berlin) | Modified Newton's Law of Gravitation Due to Minimal Length in Quantum
Gravity | 12 pages, no figures, references added | Adv.High Energy Phys. 2013 (2013) 126528 | 10.1155/2013/126528 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent theory about the origin of the gravity suggests that the gravity is
originally an entropic force. In this work, we discuss the effects of
generalized uncertainty principle (GUP) which is proposed by some approaches to
quantum gravity such as string theory, black hole physics and doubly special
relativity the... | [
{
"created": "Tue, 15 Jan 2013 21:50:54 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Feb 2013 14:41:27 GMT",
"version": "v2"
}
] | 2013-02-25 | [
[
"Ali",
"Ahmed Farag",
"",
"Benha U."
],
[
"Tawfik",
"A.",
"",
"Egyptian Ctr. Theor. Phys.,\n Cairo and Freie U., Berlin"
]
] | A recent theory about the origin of the gravity suggests that the gravity is originally an entropic force. In this work, we discuss the effects of generalized uncertainty principle (GUP) which is proposed by some approaches to quantum gravity such as string theory, black hole physics and doubly special relativity theor... |
gr-qc/0009055 | Kazuhiro Tominaga | Kazuhiro Tominaga, Motoyuki Saijo, and Kei-ichi Maeda | Gravitational waves from a spinning particle scattered by a relativistic
star: Axial mode case | REVTeX, 17 pages with 13 figures. Submitted to Phys. Rev. D | Phys.Rev.D63:124012,2001 | 10.1103/PhysRevD.63.124012 | WU-AP/112/00 (Waseda Univ. Astrophysics) | gr-qc | null | We study gravitational waves from a spinning test particle scattered by a
relativistic star using a perturbation method. The present analysis is
restricted to axial modes. By calculating the energy spectrum, the waveforms
and the total energy and angular momentum of gravitational waves, we analyze
the dependence of t... | [
{
"created": "Fri, 15 Sep 2000 15:31:35 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Tominaga",
"Kazuhiro",
""
],
[
"Saijo",
"Motoyuki",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We study gravitational waves from a spinning test particle scattered by a relativistic star using a perturbation method. The present analysis is restricted to axial modes. By calculating the energy spectrum, the waveforms and the total energy and angular momentum of gravitational waves, we analyze the dependence of the... |
gr-qc/9701038 | Paul Parsons | John D. Barrow (University of Sussex) | Cosmological Limits on Slightly Skew Stresses | Latex, requires sw20lart package. No figures | Phys.Rev. D55 (1997) 7451-7460 | 10.1103/PhysRevD.55.7451 | null | gr-qc astro-ph | null | We present an analysis of the cosmological evolution of matter sources with
small anisotropic pressures. This includes electric and magnetic fields,
collisionless relativistic particles, gravitons, antisymmetric axion fields in
low-energy string cosmologies, spatial curvature anisotropies, and stresses
arising from s... | [
{
"created": "Thu, 16 Jan 1997 15:14:15 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Barrow",
"John D.",
"",
"University of Sussex"
]
] | We present an analysis of the cosmological evolution of matter sources with small anisotropic pressures. This includes electric and magnetic fields, collisionless relativistic particles, gravitons, antisymmetric axion fields in low-energy string cosmologies, spatial curvature anisotropies, and stresses arising from sim... |
1804.10551 | Yusuf Sucu | Ganim Gecim and Yusuf Sucu | Quantum gravity effect on the Hawking radiation of charged rotating BTZ
black hole | Published version in General Relativity and Gravitation | Gen Relativ Gravit (2018) 50: 152 | 10.1007/s10714-018-2478-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, the quantum gravity effect on the tunnelling radiation of
charged massive spin-0 scalar particle from 2+1 dimensional charged rotating
Banados-Teitelboim-Zanelli (BTZ) black hole is looked into by using the
Hamilton-Jacobi approach. For this, we calculate the modified Hawking
temperature of the black h... | [
{
"created": "Fri, 27 Apr 2018 15:12:55 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Jun 2018 14:38:40 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Nov 2018 10:02:02 GMT",
"version": "v3"
}
] | 2018-11-13 | [
[
"Gecim",
"Ganim",
""
],
[
"Sucu",
"Yusuf",
""
]
] | In this study, the quantum gravity effect on the tunnelling radiation of charged massive spin-0 scalar particle from 2+1 dimensional charged rotating Banados-Teitelboim-Zanelli (BTZ) black hole is looked into by using the Hamilton-Jacobi approach. For this, we calculate the modified Hawking temperature of the black hol... |
1212.6654 | Sunil Maharaj | M. C. Kweyama, K. S. Govinder, S. D. Maharaj | Noether and Lie symmetries for charged perfect fluids | 17 pages, To appear in Class. Quantum Grav | Class. Quantum Grav. 28: 105005, 2011 | 10.1088/0264-9381/28/10/105005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the underlying nonlinear partial differential equation that governs
the behaviour of spherically symmetric charged fluids in general relativity. We
investigate the conditions for the equation to admit a first integral or be
reduced to quadratures using symmetry methods for differential equations. A
general N... | [
{
"created": "Sat, 29 Dec 2012 18:43:13 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Kweyama",
"M. C.",
""
],
[
"Govinder",
"K. S.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | We study the underlying nonlinear partial differential equation that governs the behaviour of spherically symmetric charged fluids in general relativity. We investigate the conditions for the equation to admit a first integral or be reduced to quadratures using symmetry methods for differential equations. A general Noe... |
1409.6839 | Behrouz Mirza | Behrouz Mirza, Zeinab Sherkatghanad | Phase transitions of hairy black holes in massive gravity and
thermodynamic behavior of charged AdS black holes in an extended phase space | 7 pages, 6 figures | Phys. Rev. D 90, 084006 (2014) | 10.1103/PhysRevD.90.084006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamic behavior of static and spherically symmetric hairy
black holes in massive gravity. In this case, the black hole is surrounded in a
spherical cavity with a fixed temperature on the surface. It is observed that
these black holes have a phase transition similar to the liquid-gas phase
transiti... | [
{
"created": "Wed, 24 Sep 2014 06:20:01 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 2014 21:49:36 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Mirza",
"Behrouz",
""
],
[
"Sherkatghanad",
"Zeinab",
""
]
] | We study the thermodynamic behavior of static and spherically symmetric hairy black holes in massive gravity. In this case, the black hole is surrounded in a spherical cavity with a fixed temperature on the surface. It is observed that these black holes have a phase transition similar to the liquid-gas phase transition... |
1605.04860 | Sharmanthie Fernando | Sharmanthie Fernando | Phase transitions of black holes in massive gravity | Accepted to be published in Modern Physics Letters A. Three more
references added | Modern Physics Lettets A, Vol.31, No. 16, 1650096 (2016) | 10.1142/S0217732316500966 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have studied thermodynamics of a black hole in massive
gravity in the canonical ensemble. The massive gravity theory in consideration
here has a massive graviton due to Lorentz symmetry breaking. The black hole
studied here has a scalar charge due to the massive graviton and is
asymptotically anti-de... | [
{
"created": "Mon, 16 May 2016 18:14:25 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2016 18:02:48 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Dec 2016 15:10:44 GMT",
"version": "v3"
}
] | 2016-12-15 | [
[
"Fernando",
"Sharmanthie",
""
]
] | In this paper we have studied thermodynamics of a black hole in massive gravity in the canonical ensemble. The massive gravity theory in consideration here has a massive graviton due to Lorentz symmetry breaking. The black hole studied here has a scalar charge due to the massive graviton and is asymptotically anti-de S... |
1405.5074 | Elena P. Savelova Dr. | A.A. Kirillov, E.P. Savelova | Effective action for a free scalar field in the presence of spacetime
foam | null | GRG 47, 97 (2015) | 10.1007/s10714-015-1941-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model spacetime foam by a gas of virtual wormholes. For a free scalar
field we derive the effective Lagrangian which accounts for the interaction
with spacetime foam and contains two additional non-local terms. One term
describes the scattering of scalar particles on virtual wormholes and
explicitly reproduces the... | [
{
"created": "Tue, 20 May 2014 13:13:09 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Jun 2014 16:53:20 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Jun 2014 17:25:00 GMT",
"version": "v3"
},
{
"created": "Sun, 9 Aug 2015 05:45:02 GMT",
"version": "v4"
}
] | 2015-08-11 | [
[
"Kirillov",
"A. A.",
""
],
[
"Savelova",
"E. P.",
""
]
] | We model spacetime foam by a gas of virtual wormholes. For a free scalar field we derive the effective Lagrangian which accounts for the interaction with spacetime foam and contains two additional non-local terms. One term describes the scattering of scalar particles on virtual wormholes and explicitly reproduces the P... |
gr-qc/0611112 | Martin Bojowald | Martin Bojowald, Hector Hernandez, Mikhail Kagan and Aureliano
Skirzewski | Effective constraints of loop quantum gravity | 44 pages, 6 figures | Phys.Rev.D75:064022,2007 | 10.1103/PhysRevD.75.064022 | IGPG-06/11-4, AEI-2006-086 | gr-qc astro-ph hep-th | null | Within a perturbative cosmological regime of loop quantum gravity corrections
to effective constraints are computed. This takes into account all
inhomogeneous degrees of freedom relevant for scalar metric modes around flat
space and results in explicit expressions for modified coefficients and of
higher order terms. ... | [
{
"created": "Tue, 21 Nov 2006 20:37:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bojowald",
"Martin",
""
],
[
"Hernandez",
"Hector",
""
],
[
"Kagan",
"Mikhail",
""
],
[
"Skirzewski",
"Aureliano",
""
]
] | Within a perturbative cosmological regime of loop quantum gravity corrections to effective constraints are computed. This takes into account all inhomogeneous degrees of freedom relevant for scalar metric modes around flat space and results in explicit expressions for modified coefficients and of higher order terms. It... |
gr-qc/0307099 | Ozgur Delice | Ozgur Delice | Gravitational hedgehog, stringy hedgehog and stringy sphere | 11 pages | JHEP 0311 (2003) 058 | 10.1088/1126-6708/2003/11/058 | null | gr-qc | null | We investigate the solutions of Einstein equations such that a hedgehog
solution is matched to different exterior or interior solutions via a spherical
shell. In the case where both the exterior and the interior regions are
hedgehog solutions or one of them is flat, the resulting spherical shell
becomes a stringy she... | [
{
"created": "Wed, 23 Jul 2003 11:53:52 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Oct 2003 17:39:44 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Dec 2003 14:09:14 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Delice",
"Ozgur",
""
]
] | We investigate the solutions of Einstein equations such that a hedgehog solution is matched to different exterior or interior solutions via a spherical shell. In the case where both the exterior and the interior regions are hedgehog solutions or one of them is flat, the resulting spherical shell becomes a stringy shell... |
1608.00002 | Juan Antonio Nieto | J. A. Nieto | Alternative Self-dual Gravity in Eight Dimensions | 12 pages, Latex, accepted for publication in Modern Physics Letters A | null | 10.1142/S0217732316501479 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop an alternative Ashtekar formalism in eight dimensions. In fact,
using a MacDowell-Mansouri physical framework and a self-dual curvature
symmetry we propose an action in eight dimensions in which the Levi-Civita
tenor with eight indices plays a key role. We explicitly show that such an
action contains numbe... | [
{
"created": "Fri, 29 Jul 2016 16:47:04 GMT",
"version": "v1"
}
] | 2016-09-07 | [
[
"Nieto",
"J. A.",
""
]
] | We develop an alternative Ashtekar formalism in eight dimensions. In fact, using a MacDowell-Mansouri physical framework and a self-dual curvature symmetry we propose an action in eight dimensions in which the Levi-Civita tenor with eight indices plays a key role. We explicitly show that such an action contains number ... |
1201.2814 | Paolo Pani | Paolo Pani, Terence Delsate, Vitor Cardoso | Eddington-inspired Born-Infeld gravity. Phenomenology of non-linear
gravity-matter coupling | 16 pages, 13 figures. v2: improved section on the linear structure of
the theory, one reference added. Version accepted in PRD | null | 10.1103/PhysRevD.85.084020 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Viable corrections to the matter sector of Poisson's equation may result in
qualitatively different astrophysical phenomenology, for example the
gravitational collapse and the properties of compact objects can change
drastically. We discuss a class of modified non-relativistic theories and focus
on a relativistic com... | [
{
"created": "Fri, 13 Jan 2012 12:08:02 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Mar 2012 18:00:06 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Pani",
"Paolo",
""
],
[
"Delsate",
"Terence",
""
],
[
"Cardoso",
"Vitor",
""
]
] | Viable corrections to the matter sector of Poisson's equation may result in qualitatively different astrophysical phenomenology, for example the gravitational collapse and the properties of compact objects can change drastically. We discuss a class of modified non-relativistic theories and focus on a relativistic compl... |
2401.15965 | Qingyu Gan | Andrea Addazi, Salvatore Capozziello, Qingyu Gan | Resonant Graviton-Photon Conversion with Stochastic Magnetic Field in
the Expanding Universe | 29 pages, 5 figures | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate graviton-photon oscillations sourced by cosmological magnetic
fields from Gertsenshtein effect. We adopt a robust perturbative approach and
we find that the conversion probability from graviton to photon can be
resonantly enhanced in monochromatic, multi-chromatic and scale invariant
spectrum models of... | [
{
"created": "Mon, 29 Jan 2024 08:52:32 GMT",
"version": "v1"
}
] | 2024-01-30 | [
[
"Addazi",
"Andrea",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Gan",
"Qingyu",
""
]
] | We investigate graviton-photon oscillations sourced by cosmological magnetic fields from Gertsenshtein effect. We adopt a robust perturbative approach and we find that the conversion probability from graviton to photon can be resonantly enhanced in monochromatic, multi-chromatic and scale invariant spectrum models of s... |
gr-qc/0006062 | Fred C. Adams | Fred C. Adams (Physics Dept., University of Michigan) | The Life and Times of Extremal Black Holes | 9 pages, LaTeX, accepted to General Relativity and Gravitation | Gen.Rel.Grav. 32 (2000) 2229-2234 | 10.1023/A:1001907827388 | null | gr-qc | null | Charged extremal black holes cannot fully evaporate through the Hawking
effect and are thus long lived. Over their lifetimes, these black holes take
part in a variety of astrophysical processes, including many that lead to their
eventual destruction. This paper explores the various events that shape the
life of extre... | [
{
"created": "Fri, 16 Jun 2000 15:53:41 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Adams",
"Fred C.",
"",
"Physics Dept., University of Michigan"
]
] | Charged extremal black holes cannot fully evaporate through the Hawking effect and are thus long lived. Over their lifetimes, these black holes take part in a variety of astrophysical processes, including many that lead to their eventual destruction. This paper explores the various events that shape the life of extrema... |
1303.1687 | Jakub Mielczarek Ph.D. | Jean Pierre Gazeau, Jakub Mielczarek, Wlodzimierz Piechocki | Quantum states of the bouncing universe | 18 pages, 19 figures | null | 10.1103/PhysRevD.87.123508 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study quantum dynamics of the bouncing cosmological model.
We focus on the model of the flat Friedman-Robertson-Walker universe with a
free scalar field. The bouncing behavior, which replaces classical singularity,
appears due to the modification of general relativity along the methods of loop
quantu... | [
{
"created": "Thu, 7 Mar 2013 13:34:40 GMT",
"version": "v1"
}
] | 2013-06-12 | [
[
"Gazeau",
"Jean Pierre",
""
],
[
"Mielczarek",
"Jakub",
""
],
[
"Piechocki",
"Wlodzimierz",
""
]
] | In this paper we study quantum dynamics of the bouncing cosmological model. We focus on the model of the flat Friedman-Robertson-Walker universe with a free scalar field. The bouncing behavior, which replaces classical singularity, appears due to the modification of general relativity along the methods of loop quantum ... |
gr-qc/9903061 | Kristin Schleich | Kristin Schleich and Donald M. Witt | Topological Censorship | Revtex 3, 6 epsf figures. This format differs slightly from that used
to produce the article as it originally appeared in the 1994 Proceedings of
the Lake Louise Winter Institute. However content is exactly the same | Published in Proceedings of the Lake Louise Winter Institute,
Particle Physics and Cosmology, Feb. 20-26, 1994, (World Scientific, 1994) | null | null | gr-qc | null | Classically, all topologies are allowed as solutions to the Einstein
equations. However, one does not observe any topological structures on medium
range distance scales, that is scales that are smaller than the size of the
observed universe but larger than the microscopic scales for which quantum
gravity becomes impo... | [
{
"created": "Wed, 17 Mar 1999 00:04:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schleich",
"Kristin",
""
],
[
"Witt",
"Donald M.",
""
]
] | Classically, all topologies are allowed as solutions to the Einstein equations. However, one does not observe any topological structures on medium range distance scales, that is scales that are smaller than the size of the observed universe but larger than the microscopic scales for which quantum gravity becomes import... |
gr-qc/0207035 | Beverly K. Berger | Beverly K. Berger | Asymptotic Behavior of a Class of Expanding Gowdy Spacetimes | 21 pages, 14 figures, uses RevTeX 4, submitted to Phys. Rev. D | null | null | null | gr-qc | null | A systematic asymptotic expansion is developed for the gravitational wave
degrees of freedom of a class of expanding, vacuum Gowdy cosmological
spacetimes. In the wave map description of these models, the evolution of the
gravitational wave amplitudes defines an orbit in the target space. The
circumference of this or... | [
{
"created": "Sun, 7 Jul 2002 23:35:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berger",
"Beverly K.",
""
]
] | A systematic asymptotic expansion is developed for the gravitational wave degrees of freedom of a class of expanding, vacuum Gowdy cosmological spacetimes. In the wave map description of these models, the evolution of the gravitational wave amplitudes defines an orbit in the target space. The circumference of this orbi... |
1307.0745 | Joao Magueijo | Giovanni Amelino-Camelia, Michele Arzano, Giulia Gubitosi and Joao
Magueijo | Rainbow gravity and scale-invariant fluctuations | null | Phys. Rev. D 88, 041303, 2013 | 10.1103/PhysRevD.88.041303 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-examine a recently proposed scenario where the deformed dispersion
relations associated with a flow of the spectral dimension to a UV value of 2
leads to a scale-invariant spectrum of cosmological fluctuations, without the
need for inflation. In that scenario Einstein gravity was assumed. The theory
displays a ... | [
{
"created": "Tue, 2 Jul 2013 16:12:36 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jul 2013 10:44:54 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Arzano",
"Michele",
""
],
[
"Gubitosi",
"Giulia",
""
],
[
"Magueijo",
"Joao",
""
]
] | We re-examine a recently proposed scenario where the deformed dispersion relations associated with a flow of the spectral dimension to a UV value of 2 leads to a scale-invariant spectrum of cosmological fluctuations, without the need for inflation. In that scenario Einstein gravity was assumed. The theory displays a wa... |
1611.08394 | Alejandro Perez | Alberto S. Cattaneo and Alejandro Perez | A note on the Poisson bracket of 2d smeared fluxes in loop quantum
gravity | 5 pages, no figures (journal version) | Class. Quant. Grav. 34, 107001 (2017) | 10.1088/1361-6382/aa69b4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the non-Abelian nature of geometric fluxes---the corner-stone in
the definition of quantum geometry in the framework of loop quantum gravity
(LQG)---follows directly form the continuum canonical commutations relations of
gravity in connection variables and the validity of the Gauss law. The present
treat... | [
{
"created": "Fri, 25 Nov 2016 09:29:25 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Apr 2017 22:53:36 GMT",
"version": "v2"
}
] | 2020-02-03 | [
[
"Cattaneo",
"Alberto S.",
""
],
[
"Perez",
"Alejandro",
""
]
] | We show that the non-Abelian nature of geometric fluxes---the corner-stone in the definition of quantum geometry in the framework of loop quantum gravity (LQG)---follows directly form the continuum canonical commutations relations of gravity in connection variables and the validity of the Gauss law. The present treatme... |
1801.05782 | Sean Gryb | Sean Gryb and Karim P. Y. Th\'ebault | Superpositions of the cosmological constant allow for singularity
resolution and unitary evolution in quantum cosmology | Version accepted to Physics Letters B. Minor revisions,
clarifications added. 7 pages, 3 figures | null | 10.1016/j.physletb.2018.08.013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel approach to quantization is shown to allow for superpositions of the
cosmological constant in isotropic and homogeneous mini-superspace models.
Generic solutions featuring such superpositions display unitary evolution and
resolution of the classical singularity. Physically well-motivated cosmological
solution... | [
{
"created": "Wed, 17 Jan 2018 18:14:40 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Aug 2018 13:21:44 GMT",
"version": "v2"
}
] | 2018-08-15 | [
[
"Gryb",
"Sean",
""
],
[
"Thébault",
"Karim P. Y.",
""
]
] | A novel approach to quantization is shown to allow for superpositions of the cosmological constant in isotropic and homogeneous mini-superspace models. Generic solutions featuring such superpositions display unitary evolution and resolution of the classical singularity. Physically well-motivated cosmological solutions ... |
2304.03786 | Maria Charisi | Maria Charisi, Stephen R. Taylor, Caitlin A. Witt, Jessie Runnoe | Efficient large-scale, targeted gravitational-wave probes of
supermassive black-hole binaries | Comments welcome | null | null | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supermassive black hole binaries are promising sources of low-frequency
gravitational waves (GWs) and bright electromagnetic emission. Pulsar timing
array searches for resolved binaries are complex and computationally expensive
and so far limited to only a few sources. We present an efficient approximation
that empow... | [
{
"created": "Fri, 7 Apr 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-04-11 | [
[
"Charisi",
"Maria",
""
],
[
"Taylor",
"Stephen R.",
""
],
[
"Witt",
"Caitlin A.",
""
],
[
"Runnoe",
"Jessie",
""
]
] | Supermassive black hole binaries are promising sources of low-frequency gravitational waves (GWs) and bright electromagnetic emission. Pulsar timing array searches for resolved binaries are complex and computationally expensive and so far limited to only a few sources. We present an efficient approximation that empower... |
1107.1181 | Bernard Kelly | Bernard J. Kelly, John G. Baker, William D. Boggs, Sean T. McWilliams,
Joan Centrella | Mergers of black-hole binaries with aligned spins: Waveform
characteristics | 19 pages, 17 figures; new version matches published article | Physical Review D 84:084009 (2011) | 10.1103/PhysRevD.84.084009 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conduct a descriptive analysis of the multipolar structure of
gravitational-radiation waveforms from equal-mass aligned-spin mergers,
following an approach first presented in the complementary context of
nonspinning black holes of varying mass ratio [J.G. Baker et al. Phys. Rev. D
78 044046 (2008)]. We find that, ... | [
{
"created": "Wed, 6 Jul 2011 16:46:41 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2011 17:13:37 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Kelly",
"Bernard J.",
""
],
[
"Baker",
"John G.",
""
],
[
"Boggs",
"William D.",
""
],
[
"McWilliams",
"Sean T.",
""
],
[
"Centrella",
"Joan",
""
]
] | We conduct a descriptive analysis of the multipolar structure of gravitational-radiation waveforms from equal-mass aligned-spin mergers, following an approach first presented in the complementary context of nonspinning black holes of varying mass ratio [J.G. Baker et al. Phys. Rev. D 78 044046 (2008)]. We find that, as... |
gr-qc/0611135 | Daniel R. Terno | Etera R. Livine and Daniel R. Terno | Quantum causal histories in the light of quantum information | 9 pages, 8 eps figures | Phys.Rev.D75:084001,2007 | 10.1103/PhysRevD.75.084001 | null | gr-qc astro-ph hep-th quant-ph | null | We use techniques of quantum information theory to analyze the quantum causal
histories approach to quantum gravity. We show that while it is consistent to
introduce closed timelike curves (CTCs), they cannot generically carry
independent degrees of freedom. Moreover, if the effective dynamics of the
chronology-respe... | [
{
"created": "Sun, 26 Nov 2006 05:30:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Livine",
"Etera R.",
""
],
[
"Terno",
"Daniel R.",
""
]
] | We use techniques of quantum information theory to analyze the quantum causal histories approach to quantum gravity. We show that while it is consistent to introduce closed timelike curves (CTCs), they cannot generically carry independent degrees of freedom. Moreover, if the effective dynamics of the chronology-respect... |
1003.2105 | Mauro Cattani | M.Cattani | Gravitational Waves II: Emitting Systems | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the basic equations that predict the emission of gravitational waves
according to the Einstein gravitation theory to calculate the luminosities and
the amplitudes of the waves generated by binary stars, pulsations of neutron
stars, wobbling of deformed neutron stars, oscillating quadrupoles, rotating
bars and ... | [
{
"created": "Wed, 10 Mar 2010 13:17:01 GMT",
"version": "v1"
}
] | 2010-03-11 | [
[
"Cattani",
"M.",
""
]
] | We use the basic equations that predict the emission of gravitational waves according to the Einstein gravitation theory to calculate the luminosities and the amplitudes of the waves generated by binary stars, pulsations of neutron stars, wobbling of deformed neutron stars, oscillating quadrupoles, rotating bars and co... |
0812.0533 | Valter Moretti | Romeo Brunetti, Lorenzo Franceschini, Valter Moretti (Dept. of
Mathematics, Trento U.) | Topological features of massive bosons on two dimensional Einstein
space-time | 41 pages, title changed, minor changes, typos corrected, references
added. Accepted for publication in Ann. Henri Poincare' | Annales Henri Poincare 10:1027-1073,2009 | 10.1007/s00023-009-0007-x | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we tackle the problem of constructing explicit examples of
topological cocycles of Roberts' net cohomology, as defined abstractly by
Brunetti and Ruzzi. We consider the simple case of massive bosonic quantum
field theory on the two dimensional Einstein cylinder. After deriving some
crucial results of th... | [
{
"created": "Tue, 2 Dec 2008 16:07:47 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 2009 20:34:11 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jul 2009 13:58:58 GMT",
"version": "v3"
}
] | 2009-12-15 | [
[
"Brunetti",
"Romeo",
"",
"Dept. of\n Mathematics, Trento U."
],
[
"Franceschini",
"Lorenzo",
"",
"Dept. of\n Mathematics, Trento U."
],
[
"Moretti",
"Valter",
"",
"Dept. of\n Mathematics, Trento U."
]
] | In this paper we tackle the problem of constructing explicit examples of topological cocycles of Roberts' net cohomology, as defined abstractly by Brunetti and Ruzzi. We consider the simple case of massive bosonic quantum field theory on the two dimensional Einstein cylinder. After deriving some crucial results of the ... |
1606.06545 | Saheb Soroushfar | Bahareh Hoseini, Reza Saffari, Saheb Soroushfar | Geodesic Motion in the Spacetime Of a SU(2)-Colored (A)dS Black Hole in
Conformal Gravity | 14 pages, 2 table, 18 figures | Eur. Phys. J. Plus 136, 489 (2021) | 10.1140/epjp/s13360-021-01511-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the geodesic motion in the spacetime of a
SU(2)-colored (A)dS black hole in conformal gravity, and also we investigate
spacetime features, such as light spheres and horizons. Moreover, we derive the
analytical solutions for the equation of motion of test particles and light
rays using Weierstr... | [
{
"created": "Tue, 21 Jun 2016 12:44:15 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2016 19:49:37 GMT",
"version": "v2"
},
{
"created": "Sat, 15 Jul 2017 21:45:15 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Jul 2017 12:49:38 GMT",
"version": "v4"
},
{
"c... | 2021-05-10 | [
[
"Hoseini",
"Bahareh",
""
],
[
"Saffari",
"Reza",
""
],
[
"Soroushfar",
"Saheb",
""
]
] | In this paper, we study the geodesic motion in the spacetime of a SU(2)-colored (A)dS black hole in conformal gravity, and also we investigate spacetime features, such as light spheres and horizons. Moreover, we derive the analytical solutions for the equation of motion of test particles and light rays using Weierstras... |
1512.01667 | Sunil Maurya DR. | S.K. Maurya, Smitha T. T., Y.K.Gupta, Farook Rahaman | A new exact solution for anisotropic compact stars of embedding class
one | 16 pages, 12 figures and 3 tables in European physical Journal A -
2016 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have presented a new anisotropic solution of Einstein's field equations
for compact star models. The Einstein's field equations are solved by using the
class one condition \cite{1}. After that we constructed the physically valid
expression of anisotropy factor by the help of metric potentials and there
after we ob... | [
{
"created": "Sat, 5 Dec 2015 13:47:47 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2016 21:00:08 GMT",
"version": "v2"
}
] | 2016-08-01 | [
[
"Maurya",
"S. K.",
""
],
[
"T.",
"Smitha T.",
""
],
[
"Gupta",
"Y. K.",
""
],
[
"Rahaman",
"Farook",
""
]
] | We have presented a new anisotropic solution of Einstein's field equations for compact star models. The Einstein's field equations are solved by using the class one condition \cite{1}. After that we constructed the physically valid expression of anisotropy factor by the help of metric potentials and there after we obta... |
1310.2939 | Yi-Zen Chu | Yi-Zen Chu | A Line Source in Minkowski for the de Sitter Spacetime Scalar Green's
Function: Massive Case | 24 pages, 2 figures. v2: Causal structure figures added | null | 10.1088/0264-9381/32/13/135008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For certain classes of space(time)s embeddable in a higher dimensional flat
space(time), it appears possible to compute the minimally coupled massless
scalar Green's function in the former by convolving its cousin in the latter
with an appropriate scalar charge density. The physical interpretation is that
beings resi... | [
{
"created": "Thu, 10 Oct 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 2014 17:36:44 GMT",
"version": "v2"
},
{
"created": "Wed, 27 May 2015 04:43:47 GMT",
"version": "v3"
}
] | 2015-07-15 | [
[
"Chu",
"Yi-Zen",
""
]
] | For certain classes of space(time)s embeddable in a higher dimensional flat space(time), it appears possible to compute the minimally coupled massless scalar Green's function in the former by convolving its cousin in the latter with an appropriate scalar charge density. The physical interpretation is that beings residi... |
1907.12594 | Leandros Perivolaropoulos | F. Skara and L. Perivolaropoulos | Primordial Power Spectra of Cosmological Fluctuations with Generalized
Uncertainty Principle and Maximum Length Quantum Mechanics | 12 pages, 3 figures. Published version. Comments added, figure added,
improved statistical analysis. The Mathematica file that was used for the
production of the figures may be downloaded from
http://leandros.physics.uoi.gr/GUP-GFC/ | Phys. Rev. D 100, 123527 (2019) | 10.1103/PhysRevD.100.123527 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of the cosmological particle horizon as the maximum measurable
length $l_{max}$ in the universe leads to a generalization of the quantum
uncertainty principle (GUP) to the form $\Delta x \Delta p \geq
\frac{\hbar}{2}\frac{1}{1-\alpha\Delta x^2} $, where $\alpha\equiv
l_{max}^{-2}$. The effects of this G... | [
{
"created": "Mon, 29 Jul 2019 18:18:50 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Aug 2019 05:28:28 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Dec 2019 20:19:53 GMT",
"version": "v3"
}
] | 2019-12-25 | [
[
"Skara",
"F.",
""
],
[
"Perivolaropoulos",
"L.",
""
]
] | The existence of the cosmological particle horizon as the maximum measurable length $l_{max}$ in the universe leads to a generalization of the quantum uncertainty principle (GUP) to the form $\Delta x \Delta p \geq \frac{\hbar}{2}\frac{1}{1-\alpha\Delta x^2} $, where $\alpha\equiv l_{max}^{-2}$. The effects of this GUP... |
0804.1084 | Jonathan R. Gair | Jonathan R Gair, Ilya Mandel, Linqing Wen | Improved time-frequency analysis of extreme-mass-ratio inspiral signals
in mock LISA data | 8 pages, 1 figure; submitted to proceedings of 12th Gravitational
Wave Data Analysis Workshop | Class.Quant.Grav.25:184031,2008 | 10.1088/0264-9381/25/18/184031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The planned Laser Interferometer Space Antenna (LISA) is expected to detect
gravitational wave signals from ~100 extreme-mass-ratio inspirals (EMRIs) of
stellar-mass compact objects into massive black holes. The long duration and
large parameter space of EMRI signals makes data analysis for these signals a
challengin... | [
{
"created": "Mon, 7 Apr 2008 17:12:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gair",
"Jonathan R",
""
],
[
"Mandel",
"Ilya",
""
],
[
"Wen",
"Linqing",
""
]
] | The planned Laser Interferometer Space Antenna (LISA) is expected to detect gravitational wave signals from ~100 extreme-mass-ratio inspirals (EMRIs) of stellar-mass compact objects into massive black holes. The long duration and large parameter space of EMRI signals makes data analysis for these signals a challenging ... |
1605.05975 | Klaus Liegener | Klaus Liegener and Thomas Thiemann | Towards the fundamental spectrum of the Quantum Yang-Mills Theory | 51 pages | Phys. Rev. D 94, 024042 (2016) | 10.1103/PhysRevD.94.024042 | null | gr-qc hep-lat hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we focus on the quantum Einstein-Yang-Mills sector quantised by
the methods of Loop Quantum Gravity (LQG). We point out the improved UV
behaviour of the coupled system as compared to pure quantum Yang-Mills theory
on a fixed, classical background spacetime as was considered in a seminal work
by Kogut and... | [
{
"created": "Thu, 19 May 2016 14:36:12 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2016 18:00:46 GMT",
"version": "v2"
}
] | 2016-07-29 | [
[
"Liegener",
"Klaus",
""
],
[
"Thiemann",
"Thomas",
""
]
] | In this work we focus on the quantum Einstein-Yang-Mills sector quantised by the methods of Loop Quantum Gravity (LQG). We point out the improved UV behaviour of the coupled system as compared to pure quantum Yang-Mills theory on a fixed, classical background spacetime as was considered in a seminal work by Kogut and S... |
gr-qc/0601139 | Gregor Leiler | Gregor Leiler and Luciano Rezzolla | On the iterated Crank-Nicolson for hyperbolic and parabolic equations in
numerical relativity | 7 pages, 3 figures | Phys.Rev. D73 (2006) 044001 | 10.1103/PhysRevD.73.044001 | null | gr-qc | null | The iterated Crank-Nicolson is a predictor-corrector algorithm commonly used
in numerical relativity for the solution of both hyperbolic and parabolic
partial differential equations. We here extend the recent work on the stability
of this scheme for hyperbolic equations by investigating the properties when
the averag... | [
{
"created": "Tue, 31 Jan 2006 10:46:45 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Leiler",
"Gregor",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | The iterated Crank-Nicolson is a predictor-corrector algorithm commonly used in numerical relativity for the solution of both hyperbolic and parabolic partial differential equations. We here extend the recent work on the stability of this scheme for hyperbolic equations by investigating the properties when the average ... |
1807.11330 | Neo Namane | Neo Namane, Heba Sami and Amare Abebe | Oscillating cosmological correlations in f(R) gravity | 6 pages, 4 figures, SAIP2018 conference proceedings | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The purpose of this paper is to investigate the oscillatory behavior of the
universe through a Schr\"odinger-like Friedmann equation and a modified
gravitational background described by the theory of f (R) gravity. The
motivation for this stems from the observed periodic behaviour of large-scale
cosmological structur... | [
{
"created": "Mon, 30 Jul 2018 13:05:23 GMT",
"version": "v1"
}
] | 2018-07-31 | [
[
"Namane",
"Neo",
""
],
[
"Sami",
"Heba",
""
],
[
"Abebe",
"Amare",
""
]
] | The purpose of this paper is to investigate the oscillatory behavior of the universe through a Schr\"odinger-like Friedmann equation and a modified gravitational background described by the theory of f (R) gravity. The motivation for this stems from the observed periodic behaviour of large-scale cosmological structures... |
1808.03472 | Alessia Platania | Ademola Adeifeoba, Astrid Eichhorn, Alessia Platania | Towards conditions for black-hole singularity-resolution in
asymptotically safe quantum gravity | 12 pages, 1 figure | null | 10.1088/1361-6382/aae6ef | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the fate of the curvature singularity of Schwarzschild (deSitter)
black holes in asymptotically safe quantum gravity. Specifically, we upgrade
the classical spacetime by including the running of the Newton coupling and
cosmological constant. In this setting, the antiscreening character of the
gravitational... | [
{
"created": "Fri, 10 Aug 2018 10:07:20 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Adeifeoba",
"Ademola",
""
],
[
"Eichhorn",
"Astrid",
""
],
[
"Platania",
"Alessia",
""
]
] | We explore the fate of the curvature singularity of Schwarzschild (deSitter) black holes in asymptotically safe quantum gravity. Specifically, we upgrade the classical spacetime by including the running of the Newton coupling and cosmological constant. In this setting, the antiscreening character of the gravitational i... |
gr-qc/9905037 | Andrew P. Billyard | A. G. Agnese and A. P. Billyard and H. Liu and P. S. Wesson | Possible Wormhole Solutions in (4+1) Gravity | 3 pages, latex, 1 figures | Gen.Rel.Grav. 31 (1999) 527-535 | 10.1023/A:1026646223189 | Dal-99-05 | gr-qc | null | We extend previous analyses of soliton solutions in (4+1) gravity to new
ranges of their defining parameters. The geometry, as studied using invariants,
has the topology of wormholes found in (3+1) gravity. In the induced-matter
picture, the fluid does not satisfy the strong energy conditions, but its
gravitational m... | [
{
"created": "Wed, 12 May 1999 14:14:03 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Agnese",
"A. G.",
""
],
[
"Billyard",
"A. P.",
""
],
[
"Liu",
"H.",
""
],
[
"Wesson",
"P. S.",
""
]
] | We extend previous analyses of soliton solutions in (4+1) gravity to new ranges of their defining parameters. The geometry, as studied using invariants, has the topology of wormholes found in (3+1) gravity. In the induced-matter picture, the fluid does not satisfy the strong energy conditions, but its gravitational mas... |
0905.0765 | Cornelia Feiler | E. Kajari, M. Buser, C. Feiler and W. P. Schleich | Rotation in relativity and the propagation of light | 102 pages, 35 figures, The original publication is available at
http://www.sif.it/SIF/en/portal/journals.html, to appear in "Atom Optics and
Space Physics", Proceedings of the International School of Physics "Enrico
Fermi", Course CLXVIII, edited by E. Arimondo, W. Ertmer, E. M. Rasel and W.
P. Schleich, (IOS P... | Proceedings of the International School of Physics "Enrico Fermi",
Course CLXVIII, pp. 45-148 (2009) | 10.3254/978-1-58603-990-5-45 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare and contrast the different points of view of rotation in general
relativity, put forward by Mach, Thirring and Lense, and Goedel. Our analysis
relies on two tools: (i) the Sagnac effect which allows us to measure rotations
of a coordinate system or induced by the curvature of spacetime, and (ii)
computer v... | [
{
"created": "Wed, 6 May 2009 08:18:57 GMT",
"version": "v1"
}
] | 2011-08-02 | [
[
"Kajari",
"E.",
""
],
[
"Buser",
"M.",
""
],
[
"Feiler",
"C.",
""
],
[
"Schleich",
"W. P.",
""
]
] | We compare and contrast the different points of view of rotation in general relativity, put forward by Mach, Thirring and Lense, and Goedel. Our analysis relies on two tools: (i) the Sagnac effect which allows us to measure rotations of a coordinate system or induced by the curvature of spacetime, and (ii) computer vis... |
gr-qc/0203096 | Friedrich W. Hehl | Friedrich W. Hehl (Cologne), Yuri N. Obukhov (Cologne/Moscow),
Guillermo F. Rubilar (Cologne) | On a possible new type of a T odd skewon field linked to
electromagnetism | 17 pages, LaTeX2e. Invited paper, Proceedings 1st Mexican Meeting on
Math. and Exp. Physics, Mexico City, Sept.2001, corrected and slightly
updated | null | null | null | gr-qc hep-th | null | In the framework of generally covariant (pre-metric) electrodynamics
(``charge & flux electrodynamics''), the Maxwell equations can be formulated in
terms of the electromagnetic excitation $H=({\cal D}, {\cal H})$ and the field
strength $F=(E,B)$. If the spacetime relation linking $H$ and $F$ is assumed to
be {\em li... | [
{
"created": "Tue, 26 Mar 2002 23:50:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hehl",
"Friedrich W.",
"",
"Cologne"
],
[
"Obukhov",
"Yuri N.",
"",
"Cologne/Moscow"
],
[
"Rubilar",
"Guillermo F.",
"",
"Cologne"
]
] | In the framework of generally covariant (pre-metric) electrodynamics (``charge & flux electrodynamics''), the Maxwell equations can be formulated in terms of the electromagnetic excitation $H=({\cal D}, {\cal H})$ and the field strength $F=(E,B)$. If the spacetime relation linking $H$ and $F$ is assumed to be {\em line... |
1312.3956 | Alexander Vilenkin | Alexander Vilenkin and Aron C. Wall | Cosmological singularity theorems and black holes | References added | Phys. Rev. D 89, 064035 (2014) | 10.1103/PhysRevD.89.064035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An extension of Penrose's singularity theorem is proved for spacetimes where
black holes are allowed to form from non-singular initial data. With standard
assumptions about the spacetime, and assuming the existence of a trapped
surface which lies outside of black hole horizons and is not completely
surrounded by hori... | [
{
"created": "Fri, 13 Dec 2013 21:15:48 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jan 2014 15:46:20 GMT",
"version": "v2"
}
] | 2014-03-26 | [
[
"Vilenkin",
"Alexander",
""
],
[
"Wall",
"Aron C.",
""
]
] | An extension of Penrose's singularity theorem is proved for spacetimes where black holes are allowed to form from non-singular initial data. With standard assumptions about the spacetime, and assuming the existence of a trapped surface which lies outside of black hole horizons and is not completely surrounded by horizo... |
2101.07527 | Xiangdong Zhang | Xiangdong Zhang, Gaoping Long and Yongge Ma | Loop quantum gravity and cosmological constant | 6 pages, 1 figure; v2, accepted by PLB | Physics Letters B 823, (2021) 136770 | 10.1016/j.physletb.2021.136770 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | An one-parameter regularization freedom of the Hamiltonian constraint for
loop quantum gravity is analyzed. The corresponding spatially flat, homogenous
and isotropic model includes the two well-known models of loop quantum
cosmology as special cases. The quantum bounce nature is tenable in the
generalized cases. For... | [
{
"created": "Tue, 19 Jan 2021 09:28:23 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Nov 2021 11:44:02 GMT",
"version": "v2"
}
] | 2021-11-12 | [
[
"Zhang",
"Xiangdong",
""
],
[
"Long",
"Gaoping",
""
],
[
"Ma",
"Yongge",
""
]
] | An one-parameter regularization freedom of the Hamiltonian constraint for loop quantum gravity is analyzed. The corresponding spatially flat, homogenous and isotropic model includes the two well-known models of loop quantum cosmology as special cases. The quantum bounce nature is tenable in the generalized cases. For p... |
1901.11236 | Sayan Kar | Indranil Chakraborty and Sayan Kar (IIT Kharagpur, India) | Geodesic congruences in exact plane wave spacetimes and the memory
effect | 27 pages, 13 figures, major changes (including title and abstract),
rewritten with a different focus, new results added | Phys. Rev. D 101, 064022 (2020) | 10.1103/PhysRevD.101.064022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Displacement and velocity memory effects in the exact, vacuum, plane
gravitational wave line element have been studied recently by looking at the
behaviour of pairs of geodesics or via geodesic deviation. Instead, one may
investigate the evolution of geodesic congruences. In our work here, we obtain
the evolution of ... | [
{
"created": "Thu, 31 Jan 2019 07:02:02 GMT",
"version": "v1"
},
{
"created": "Wed, 29 May 2019 10:46:26 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Nov 2019 09:57:23 GMT",
"version": "v3"
},
{
"created": "Sat, 14 Mar 2020 04:59:34 GMT",
"version": "v4"
}
] | 2020-03-18 | [
[
"Chakraborty",
"Indranil",
"",
"IIT Kharagpur, India"
],
[
"Kar",
"Sayan",
"",
"IIT Kharagpur, India"
]
] | Displacement and velocity memory effects in the exact, vacuum, plane gravitational wave line element have been studied recently by looking at the behaviour of pairs of geodesics or via geodesic deviation. Instead, one may investigate the evolution of geodesic congruences. In our work here, we obtain the evolution of th... |
2010.06386 | Rustam Gainutdinov | Rustam Gainutdinov and Yurij Baryshev | Relativistic effects in orbital motion of the S-stars at the Galactic
Center | Accepted for publication in the journal Universe, 08.10.2020 | Universe 2020, 6(10), 177 | 10.3390/universe6100177 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Galactic Center star cluster, known as S-stars, is a perfect source of
relativistic phenomena observations. The stars are located in the strong field
of relativistic compact object Sgr A* and are moving with very high velocities
at pericenters of their orbits. In this work we consider motion of several
S-stars by... | [
{
"created": "Sat, 10 Oct 2020 04:41:56 GMT",
"version": "v1"
}
] | 2020-10-15 | [
[
"Gainutdinov",
"Rustam",
""
],
[
"Baryshev",
"Yurij",
""
]
] | The Galactic Center star cluster, known as S-stars, is a perfect source of relativistic phenomena observations. The stars are located in the strong field of relativistic compact object Sgr A* and are moving with very high velocities at pericenters of their orbits. In this work we consider motion of several S-stars by u... |
1512.07017 | Nilanjana Mahata | Nilanjana Mahata and Subenoy Chakraborty | A Dynamical System Analysis of Three Fluid cosmological Model | 10 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Friedman-Robertson-Walker flat spacetime, we consider a three fluid
cosmological model which contains dark matter, dark energy and baryonic matter
in the form of perfect fluid with a barotropic equation of state. Dark matter
is taken in form of dust and dark energy is described by a scalar field with a
potential $... | [
{
"created": "Tue, 22 Dec 2015 10:21:11 GMT",
"version": "v1"
}
] | 2015-12-23 | [
[
"Mahata",
"Nilanjana",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In Friedman-Robertson-Walker flat spacetime, we consider a three fluid cosmological model which contains dark matter, dark energy and baryonic matter in the form of perfect fluid with a barotropic equation of state. Dark matter is taken in form of dust and dark energy is described by a scalar field with a potential $V(... |
1311.4443 | Sebastiano Bernuzzi | Sebastiano Bernuzzi, Tim Dietrich, Wolfgang Tichy, and Bernd Bruegmann | Mergers of binary neutron stars with realistic spin | null | Phys. Rev. D 89, 104021 (2014) | 10.1103/PhysRevD.89.104021 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simulations of binary neutron stars have seen great advances in terms of
physical detail and numerical quality. However, the spin of the neutron stars,
one of the simplest global parameters of binaries, remains mostly unstudied. We
present the first, fully nonlinear general relativistic dynamical evolutions of
the la... | [
{
"created": "Mon, 18 Nov 2013 16:35:30 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jun 2014 14:10:27 GMT",
"version": "v2"
}
] | 2015-04-15 | [
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Tichy",
"Wolfgang",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | Simulations of binary neutron stars have seen great advances in terms of physical detail and numerical quality. However, the spin of the neutron stars, one of the simplest global parameters of binaries, remains mostly unstudied. We present the first, fully nonlinear general relativistic dynamical evolutions of the last... |
gr-qc/0005079 | Bahram Mashhoon | Hongya Liu (Dalian University of Technology, China), and Bahram
Mashhoon (University of Missouri-Columbia, USA) | Spacetime Measurements in Kaluza-Klein Gravity | LaTeX, 12 pages, no figures, 2 references added, to appear in Phys.
Lett. A | Phys.Lett. A272 (2000) 26-31 | 10.1016/S0375-9601(00)00407-2 | null | gr-qc | null | We extend the classical general relativistic theory of measurement to include
the possibility of existence of higher dimensions. The intrusion of these
dimensions in the spacetime interval implies that the inertial mass of a
particle in general varies along its worldline if the observations are analyzed
assuming the ... | [
{
"created": "Thu, 18 May 2000 00:44:39 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2000 21:34:15 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Liu",
"Hongya",
"",
"Dalian University of Technology, China"
],
[
"Mashhoon",
"Bahram",
"",
"University of Missouri-Columbia, USA"
]
] | We extend the classical general relativistic theory of measurement to include the possibility of existence of higher dimensions. The intrusion of these dimensions in the spacetime interval implies that the inertial mass of a particle in general varies along its worldline if the observations are analyzed assuming the ex... |
gr-qc/9712089 | Yuri N. Obukhov | Friedrich W. Hehl and Yuri N. Obukhov | Is a `hadronic' shear current one of the sources in metric-affine
gravity? | Latex, mprocl.sty, 3 pages. Contribution to 8th Marcel Grossmann
meeting, Jerusalem 1997 | null | null | null | gr-qc | null | The Minkowski space of special relativity can be understood as a flat
4-dimensional affine space enriched by a constant Minkowski metric. If we gauge
the general affine group and `superimpose' the metric, then we arrive at the
metric-affine theory of gravity (MAG). The gravitational potentials are the
spacetime cofra... | [
{
"created": "Tue, 23 Dec 1997 16:38:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hehl",
"Friedrich W.",
""
],
[
"Obukhov",
"Yuri N.",
""
]
] | The Minkowski space of special relativity can be understood as a flat 4-dimensional affine space enriched by a constant Minkowski metric. If we gauge the general affine group and `superimpose' the metric, then we arrive at the metric-affine theory of gravity (MAG). The gravitational potentials are the spacetime coframe... |
gr-qc/0311056 | Mariano Cadoni | Mariano Cadoni | Black Hole fragmentation and holography | 7 pages, no figures | Phys.Rev. D69 (2004) 084021 | 10.1103/PhysRevD.69.084021 | INFNCA-TH0304 | gr-qc hep-th | null | We discuss the entropy change due to fragmentation for black hole solutions
in various dimensions. We find three different types of behavior. The entropy
may decrease, increase or have a mixed behavior, characterized by the presence
of a threshold mass. For two-dimensional (2D) black holes we give a complete
characte... | [
{
"created": "Tue, 18 Nov 2003 13:33:00 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Cadoni",
"Mariano",
""
]
] | We discuss the entropy change due to fragmentation for black hole solutions in various dimensions. We find three different types of behavior. The entropy may decrease, increase or have a mixed behavior, characterized by the presence of a threshold mass. For two-dimensional (2D) black holes we give a complete characteri... |
1909.05811 | Philip Tee | Philip Tee | Dynamics and the Emergence of Geometry in an Information Mesh | null | null | 10.1140/epjc/s10052-020-8282-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The idea of a graph theoretical approach to modeling the emergence of a
quantized geometry and consequently spacetime, has been proposed previously,
but not well studied. In most approaches the focus has been upon how to
generate a spacetime that possesses properties that would be desirable at the
continuum limit, an... | [
{
"created": "Thu, 12 Sep 2019 17:13:04 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2020 22:24:14 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Jul 2020 14:50:10 GMT",
"version": "v3"
},
{
"created": "Sun, 25 Apr 2021 23:06:09 GMT",
"version": "v4"
}
] | 2021-04-27 | [
[
"Tee",
"Philip",
""
]
] | The idea of a graph theoretical approach to modeling the emergence of a quantized geometry and consequently spacetime, has been proposed previously, but not well studied. In most approaches the focus has been upon how to generate a spacetime that possesses properties that would be desirable at the continuum limit, and ... |
1005.5670 | Yousef Bisabr | Yousef Bisabr | Local Gravity Constraints and Power Law f(R) Theories | 11 Pages, no figure. To appear in Gravitation and Cosmology | Grav.Cosmol.16:239-244,2010 | 10.1134/S0202289310030084 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is a conformal equivalence between power law $f(R)$ theories and scalar
field theories in which the scalar degree of freedom evolves under the action
of an exponential potential function. In the scalar field representation there
is a strong coupling of the scalar field with the matter sector due to the
conforma... | [
{
"created": "Mon, 31 May 2010 12:25:17 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Bisabr",
"Yousef",
""
]
] | There is a conformal equivalence between power law $f(R)$ theories and scalar field theories in which the scalar degree of freedom evolves under the action of an exponential potential function. In the scalar field representation there is a strong coupling of the scalar field with the matter sector due to the conformal ... |
gr-qc/9409014 | null | D. Giulini and C. Kiefer | Consistency of Semiclassical Gravity | 12 pages, LATEX, Report Freiburg THEP-94/20 | Class.Quant.Grav.12:403-412,1995 | 10.1088/0264-9381/12/2/009 | null | gr-qc | null | We discuss some subtleties which arise in the semiclassical approximation to
quantum gravity. We show that integrability conditions prevent the existence of
Tomonaga-Schwinger time functions on the space of three-metrics but admit them
on superspace. The concept of semiclassical time is carefully examined. We
point o... | [
{
"created": "Thu, 8 Sep 1994 08:00:42 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Giulini",
"D.",
""
],
[
"Kiefer",
"C.",
""
]
] | We discuss some subtleties which arise in the semiclassical approximation to quantum gravity. We show that integrability conditions prevent the existence of Tomonaga-Schwinger time functions on the space of three-metrics but admit them on superspace. The concept of semiclassical time is carefully examined. We point out... |
1307.1603 | Stefan Hollands | Stefan Hollands, Alexander Thorne | Bondi mass cannot become negative in higher dimensions | 19 pages, Latex, no figures, v2: Introduction partly reorganized,
minor corrections | null | 10.1007/s00220-014-2096-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the Bondi mass of an asymptotically flat, vacuum, spacetime
cannot become negative in any even dimension $d \ge 4$. The notion of Bondi
mass is more subtle in $d > 4$ dimensions because radiating metrics have a
slower decay than stationary ones, and those subtleties are reflected by a
considerably more ... | [
{
"created": "Fri, 5 Jul 2013 13:05:32 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jan 2014 11:40:39 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Hollands",
"Stefan",
""
],
[
"Thorne",
"Alexander",
""
]
] | We prove that the Bondi mass of an asymptotically flat, vacuum, spacetime cannot become negative in any even dimension $d \ge 4$. The notion of Bondi mass is more subtle in $d > 4$ dimensions because radiating metrics have a slower decay than stationary ones, and those subtleties are reflected by a considerably more di... |
2309.15853 | Salim Shekh Dr. | S. H. Shekh, Hira Sohail, Irfan Mahmood, Allah Ditta, Anil Kumar Yadav | Models of f(Q) gravity with electromagnetic field | pages-16, Figures-0, | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are so many ideas that potentially explain the dark energy phenomenon,
current research is focusing on a more in-depth analysis of the potential
effects of modified gravity on both local and cosmic scales. In this paper we
have investigated some cosmic reconstructions in $f (Q)$ cosmology where $Q$ is
the non-m... | [
{
"created": "Thu, 31 Aug 2023 16:16:45 GMT",
"version": "v1"
}
] | 2023-09-29 | [
[
"Shekh",
"S. H.",
""
],
[
"Sohail",
"Hira",
""
],
[
"Mahmood",
"Irfan",
""
],
[
"Ditta",
"Allah",
""
],
[
"Yadav",
"Anil Kumar",
""
]
] | There are so many ideas that potentially explain the dark energy phenomenon, current research is focusing on a more in-depth analysis of the potential effects of modified gravity on both local and cosmic scales. In this paper we have investigated some cosmic reconstructions in $f (Q)$ cosmology where $Q$ is the non-met... |
2211.07469 | Alejandro C\'ardenas-Avenda\~no | Alejandro C\'ardenas-Avenda\~no, Alexandru Lupsasca, Hengrui Zhu | Adaptive Analytical Ray Tracing of Black Hole Photon Rings | 39 pages, 16 figures. Updated to match published version. V4:
corrected two very minor typos (in Eqs. 50 and 70) | Phys. Rev. D 107, 043030, 2023 | 10.1103/PhysRevD.107.043030 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Recent interferometric observations by the Event Horizon Telescope have
resolved the horizon-scale emission from sources in the vicinity of nearby
supermassive black holes. Future space-based interferometers promise to measure
the "photon ring"--a narrow, ring-shaped, lensed feature predicted by general
relativity, b... | [
{
"created": "Mon, 14 Nov 2022 15:51:50 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Feb 2023 17:26:29 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Feb 2023 16:11:17 GMT",
"version": "v3"
},
{
"created": "Tue, 4 Jun 2024 23:14:52 GMT",
"version": "v4"
}
] | 2024-06-06 | [
[
"Cárdenas-Avendaño",
"Alejandro",
""
],
[
"Lupsasca",
"Alexandru",
""
],
[
"Zhu",
"Hengrui",
""
]
] | Recent interferometric observations by the Event Horizon Telescope have resolved the horizon-scale emission from sources in the vicinity of nearby supermassive black holes. Future space-based interferometers promise to measure the "photon ring"--a narrow, ring-shaped, lensed feature predicted by general relativity, but... |
gr-qc/0307090 | Enrique Alvarez | Enrique \'Alvarez (IFT UAM/CSIC, Madrid) | Loops versus strings | 19 pages. Talk given in the meeting "What comes beyond the standard
model?", Portoroz, Eslovenia, 12-17 July 2003 | null | null | IFT-UAM/CSIC-03-23 | gr-qc hep-th | null | Two popular attempts to understand the quantum physics of gravitation are
critically assessed. The talk on which this paper is based was intended for a
general particle-physics audience.
| [
{
"created": "Mon, 21 Jul 2003 09:22:07 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jul 2003 11:25:48 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Álvarez",
"Enrique",
"",
"IFT UAM/CSIC, Madrid"
]
] | Two popular attempts to understand the quantum physics of gravitation are critically assessed. The talk on which this paper is based was intended for a general particle-physics audience. |
gr-qc/0406076 | Alessandro D. A. M. Spallicci | Alessandro D.A.M. Spallicci, Sofiane Aoudia, Jose De Freitas Pacheco,
Giorgio Frossati, Tania Regimbau | Advanced VIRGO: detector optimization for gravitational waves by
inspiralling binaries | Change of title (Virgo detector optimization for gravitational waves
by coalescing binaries) and partially of text. 6 figures | Class.Quant.Grav. 22 (2005) S461-S469 | 10.1088/0264-9381/22/10/044 | null | gr-qc | null | For future configurations, we study the relation between the abatement of the
noise sources and the Signal to Noise Ratio (SNR) for coalescing binaries. Our
aim is not the proposition of a new design, but an indication of where in the
bandwidth or for which noise source, a noise reduction would be most efficient.
We ... | [
{
"created": "Sun, 20 Jun 2004 09:53:21 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Dec 2004 21:59:05 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jun 2005 23:36:45 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Spallicci",
"Alessandro D. A. M.",
""
],
[
"Aoudia",
"Sofiane",
""
],
[
"Pacheco",
"Jose De Freitas",
""
],
[
"Frossati",
"Giorgio",
""
],
[
"Regimbau",
"Tania",
""
]
] | For future configurations, we study the relation between the abatement of the noise sources and the Signal to Noise Ratio (SNR) for coalescing binaries. Our aim is not the proposition of a new design, but an indication of where in the bandwidth or for which noise source, a noise reduction would be most efficient. We ta... |
1306.6299 | Alessandro Nagar | Alessandro Nagar | Gravitational recoil in nonspinning black hole binaries: the span of
test-mass results | 5 pages, 3 figures. Matches published version | Physical Review D 88, 121501 (R), 2013 | 10.1103/PhysRevD.88.121501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider binary systems of coalescing, nonspinning, black holes of masses
$m_{1}$ and $m_{2}$ and show that the gravitational recoil velocity for any
mass ratio can be obtained accurately by extrapolating the waveform of the
test-mass limit case. The waveform obtained in the limit $m_1/m_2\ll 1$ via a
perturbative... | [
{
"created": "Wed, 26 Jun 2013 17:45:26 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Dec 2013 22:27:26 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Nagar",
"Alessandro",
""
]
] | We consider binary systems of coalescing, nonspinning, black holes of masses $m_{1}$ and $m_{2}$ and show that the gravitational recoil velocity for any mass ratio can be obtained accurately by extrapolating the waveform of the test-mass limit case. The waveform obtained in the limit $m_1/m_2\ll 1$ via a perturbative a... |
0704.2508 | Paul Tod | Paul Tod | Analyticity of strictly static and strictly stationary, inheriting and
non-inheriting Einstein-Maxwell solutions | 11 pages; to appear in Gen.Rel.Grav | Gen.Rel.Grav.39:1031-1042,2007 | 10.1007/s10714-007-0436-0 | null | gr-qc | null | Following the technique of M\"uller-zum-Hagen, refs [1,2], we show that
strictly static and strictly stationary solutions of the Einstein-Maxwell
equations are analytic in harmonic coordinates. This holds whether or not the
Maxwell field inherits the symmetry.
| [
{
"created": "Thu, 19 Apr 2007 11:23:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Tod",
"Paul",
""
]
] | Following the technique of M\"uller-zum-Hagen, refs [1,2], we show that strictly static and strictly stationary solutions of the Einstein-Maxwell equations are analytic in harmonic coordinates. This holds whether or not the Maxwell field inherits the symmetry. |
2310.13405 | Federico Stachurski Mr. | Federico Stachurski, Christopher Messenger, Martin Hendry | Cosmological Inference using Gravitational Waves and Normalising Flows | 5 pages, 2 figures, to be submitted to Physics Review Letters (PRL) | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a machine learning approach using normalising flows for inferring
cosmological parameters from gravitational wave events. Our methodology is
general to any type of compact binary coalescence event and cosmological model
and relies on the generation of training data representing distributions of
gravitation... | [
{
"created": "Fri, 20 Oct 2023 10:23:41 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2023 16:46:10 GMT",
"version": "v2"
}
] | 2023-10-26 | [
[
"Stachurski",
"Federico",
""
],
[
"Messenger",
"Christopher",
""
],
[
"Hendry",
"Martin",
""
]
] | We present a machine learning approach using normalising flows for inferring cosmological parameters from gravitational wave events. Our methodology is general to any type of compact binary coalescence event and cosmological model and relies on the generation of training data representing distributions of gravitational... |
2011.13499 | Daniel Flores | D. Flores-Alfonso, C. S. Lopez-Monsalvo, M. Maceda | Contact Geometry in Superconductors and New Massive Gravity | null | Phys. Lett. B 815 (2021) 136143 | 10.1016/j.physletb.2021.136143 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | The defining property of every three-dimensional $\varepsilon$-contact
manifold is shown to be equivalent to requiring the fulfillment of London's
equation in 2+1 electromagnetism. To illustrate this point, we show that every
such manifold that is also K-contact and $\eta$-Einstein is a vacuum solution
to the most ge... | [
{
"created": "Thu, 26 Nov 2020 23:52:03 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Dec 2020 23:33:58 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Feb 2021 15:29:08 GMT",
"version": "v3"
}
] | 2021-02-23 | [
[
"Flores-Alfonso",
"D.",
""
],
[
"Lopez-Monsalvo",
"C. S.",
""
],
[
"Maceda",
"M.",
""
]
] | The defining property of every three-dimensional $\varepsilon$-contact manifold is shown to be equivalent to requiring the fulfillment of London's equation in 2+1 electromagnetism. To illustrate this point, we show that every such manifold that is also K-contact and $\eta$-Einstein is a vacuum solution to the most gene... |
1904.11089 | Huan Yang | Huan Yang | Inspiralling eccentric binary neutron stars: orbital motion and tidal
resonance | 18 pages, 1 figure | Phys. Rev. D 100, 064023 (2019) | 10.1103/PhysRevD.100.064023 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the orbital evolution of eccentric binary neutron stars. The orbit
is described as a Quasi-Keplarian orbit with perturbations due to tidal
couplings. We find that the tidal interaction between stars contributes to
orbital precession, in addition to the Post-Newtonian procession. The coupling
between the angu... | [
{
"created": "Wed, 24 Apr 2019 22:39:01 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Sep 2019 13:37:14 GMT",
"version": "v2"
}
] | 2019-09-25 | [
[
"Yang",
"Huan",
""
]
] | We study the orbital evolution of eccentric binary neutron stars. The orbit is described as a Quasi-Keplarian orbit with perturbations due to tidal couplings. We find that the tidal interaction between stars contributes to orbital precession, in addition to the Post-Newtonian procession. The coupling between the angula... |
2307.15384 | Xiangdong Zhang | Wenxi Zhai and Xiangdong Zhang | Gauss-Bonnet solution with a cloud of strings in de Sitter and anti-de
Sitter space | 16 pages, 7 figures | Chinese Physics C Vol. 48, No. 1 (2024) 015101 | 10.1088/1674-1137/ad010d | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we present exact spherically symmetric Gauss-Bonnet black hole
solutions surrounded by a cloud of strings fluid with cosmological constant in
$D>4$ dimensions. Both charged and uncharged cases are considered. We focus on
the de Sitter solutions in the main text and leave the Anti-de Sitter solutions
in... | [
{
"created": "Fri, 28 Jul 2023 08:14:24 GMT",
"version": "v1"
}
] | 2023-12-27 | [
[
"Zhai",
"Wenxi",
""
],
[
"Zhang",
"Xiangdong",
""
]
] | In this paper, we present exact spherically symmetric Gauss-Bonnet black hole solutions surrounded by a cloud of strings fluid with cosmological constant in $D>4$ dimensions. Both charged and uncharged cases are considered. We focus on the de Sitter solutions in the main text and leave the Anti-de Sitter solutions in t... |
1711.07730 | Qiang Wang | Jianfeng Su and Qiang Wang and Qinghua Wang and Philippe Jetzer | Low-frequency Gravitational Wave Detection via Double Optical Clocks in
Space | 18 pages, 2 figures | null | 10.1088/1361-6382/aab2eb | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a Doppler tracking system for gravitational wave detection via
Double Optical Clocks in Space (DOCS). In this configuration two spacecrafts
(each containing an optical clock) are launched to space for Doppler shift
observations. Compared to the similar attempt of gravitational wave detection
in the Cassini... | [
{
"created": "Tue, 21 Nov 2017 11:43:14 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2018 11:33:48 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Su",
"Jianfeng",
""
],
[
"Wang",
"Qiang",
""
],
[
"Wang",
"Qinghua",
""
],
[
"Jetzer",
"Philippe",
""
]
] | We propose a Doppler tracking system for gravitational wave detection via Double Optical Clocks in Space (DOCS). In this configuration two spacecrafts (each containing an optical clock) are launched to space for Doppler shift observations. Compared to the similar attempt of gravitational wave detection in the Cassini m... |
gr-qc/0312019 | Stoytcho Yazadjiev | Stoytcho S. Yazadjiev (Sofia University) | Interior perfect fluid scalar-tensor solution | 8 pages, 3 figures, LaTex | Phys.Rev. D69 (2004) 127501 | 10.1103/PhysRevD.69.127501 | null | gr-qc | null | We present a new exact perfect fluid interior solution for a particular
scalar-tensor theory. The solution is regular everywhere and has a well defined
boundary where the fluid pressure vanishes. The metric and the dilaton field
match continuously the external solution.
| [
{
"created": "Wed, 3 Dec 2003 08:25:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Yazadjiev",
"Stoytcho S.",
"",
"Sofia University"
]
] | We present a new exact perfect fluid interior solution for a particular scalar-tensor theory. The solution is regular everywhere and has a well defined boundary where the fluid pressure vanishes. The metric and the dilaton field match continuously the external solution. |
gr-qc/9307014 | Gary Horowitz | Dieter Brill, Gary Horowitz, David Kastor, and Jennie Traschen | Testing Cosmic Censorship with Black Hole Collisions | 30 pages, 8 figs., phyzzx | Phys.Rev. D49 (1994) 840-852 | 10.1103/PhysRevD.49.840 | null | gr-qc hep-th | null | There exists an upper limit on the mass of black holes when the cosmological
constant $\Lambda$ is positive. We study the collision of two black holes whose
total mass exceeds this limit. Our investigation is based on a recently
discovered exact solution describing the collision of $Q=M$ black holes with
$\Lambda > 0... | [
{
"created": "Mon, 12 Jul 1993 20:32:44 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Brill",
"Dieter",
""
],
[
"Horowitz",
"Gary",
""
],
[
"Kastor",
"David",
""
],
[
"Traschen",
"Jennie",
""
]
] | There exists an upper limit on the mass of black holes when the cosmological constant $\Lambda$ is positive. We study the collision of two black holes whose total mass exceeds this limit. Our investigation is based on a recently discovered exact solution describing the collision of $Q=M$ black holes with $\Lambda > 0$.... |
gr-qc/9512047 | Sergey Solodukhin | A.O. Barvinsky and S.N. Solodukhin | Non-minimal coupling, boundary terms and renormalization of the
Einstein-Hilbert action | 14 pages, latex. More discussion added, the case of 2D Maxwell field
considered in more details | Nucl.Phys. B479 (1996) 305-318 | 10.1016/0550-3213(96)00438-5 | WATPHYS-TH-95-11 | gr-qc hep-th | null | A consistent variational procedure applied to the gravitational action
requires according to Gibbons and Hawking a certain balance between the volume
and boundary parts of the action. We consider the problem of preserving this
balance in the quantum effective action for the matter non-minimally coupled to
metric. It ... | [
{
"created": "Thu, 28 Dec 1995 23:36:18 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 1996 19:59:32 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Barvinsky",
"A. O.",
""
],
[
"Solodukhin",
"S. N.",
""
]
] | A consistent variational procedure applied to the gravitational action requires according to Gibbons and Hawking a certain balance between the volume and boundary parts of the action. We consider the problem of preserving this balance in the quantum effective action for the matter non-minimally coupled to metric. It is... |
1901.05449 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Einstein-non-linear Maxwell-Yukawa black hole | 8 pages, 6 figures | null | 10.1142/S0218271819501207 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the context of nonlinear electromagnetism we consider the Yukawa
extension of a Reissner-Nordstr\"{o}m black hole. Exact solution is given which
modifies certain characteristics of the latter. Some thermodynamical aspects
are given for comparison. The model may be considered as a useful agent to
describe a sho... | [
{
"created": "Wed, 16 Jan 2019 12:22:11 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | Within the context of nonlinear electromagnetism we consider the Yukawa extension of a Reissner-Nordstr\"{o}m black hole. Exact solution is given which modifies certain characteristics of the latter. Some thermodynamical aspects are given for comparison. The model may be considered as a useful agent to describe a short... |
2405.10604 | Nandan Roy | Chonticha Kritpetch, Nandan Roy and Narayan Banerjee | Interacting dark sector: a dynamical system perspective | 19 pages, 8 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We investigate the interaction between the dark sectors from a dynamical
systems perspective. A general setup for interacting dark energy models that
incorporates both quintessence and phantom fields through a switch parameter,
allowing an interaction in the dark sectors has been considered. In the first
part of our ... | [
{
"created": "Fri, 17 May 2024 07:59:11 GMT",
"version": "v1"
}
] | 2024-05-20 | [
[
"Kritpetch",
"Chonticha",
""
],
[
"Roy",
"Nandan",
""
],
[
"Banerjee",
"Narayan",
""
]
] | We investigate the interaction between the dark sectors from a dynamical systems perspective. A general setup for interacting dark energy models that incorporates both quintessence and phantom fields through a switch parameter, allowing an interaction in the dark sectors has been considered. In the first part of our an... |
2206.03828 | Rituparno Goswami | Sayuri Singh, Dharmanand Baboolal, Rituparno Goswami, Sunil D. Maharaj | Gaussian curvature of spherical shells: A geometric measure of
complexity | 8 pages, 1 figure, Revtex 4 | null | 10.1088/1361-6382/ac9efe | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider a semitetrad covariant decomposition of spherically
symmetric spacetimes and find a governing hyperbolic equation of the Gaussian
curvature of two dimensional spherical shells, that emerges due to the
decomposition. The restoration factor of this hyperbolic travelling wave
equation allows us... | [
{
"created": "Wed, 8 Jun 2022 11:58:05 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Singh",
"Sayuri",
""
],
[
"Baboolal",
"Dharmanand",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | In this paper we consider a semitetrad covariant decomposition of spherically symmetric spacetimes and find a governing hyperbolic equation of the Gaussian curvature of two dimensional spherical shells, that emerges due to the decomposition. The restoration factor of this hyperbolic travelling wave equation allows us t... |
gr-qc/0703115 | Jose M. M. Senovilla | Jos\'e M M Senovilla | Classification of spacelike surfaces in spacetime | 42 pages, 10 tables, many diagrams | Class.Quant.Grav.24:3091-3124,2007 | 10.1088/0264-9381/24/11/020 | null | gr-qc math.DG | null | A classification of 2-dimensional surfaces imbedded in spacetime is
presented, according to the algebraic properties of their shape tensor. The
classification has five levels, and provides among other things a refinement of
the concepts of trapped, umbilical and extremal surfaces, which split into
several different c... | [
{
"created": "Thu, 22 Mar 2007 17:48:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Senovilla",
"José M M",
""
]
] | A classification of 2-dimensional surfaces imbedded in spacetime is presented, according to the algebraic properties of their shape tensor. The classification has five levels, and provides among other things a refinement of the concepts of trapped, umbilical and extremal surfaces, which split into several different cla... |
gr-qc/0612078 | Ari Peltola | Jarmo Makela and Ari Peltola | Gravitation and Thermodynamics: The Einstein Equation of State Revisited | 17 pages, 2 figures. Final version, accepted for publication in
IJMPD. The paper has been re-organized, and significantly re-written,
although the conclusions remain essentially the same | Int.J.Mod.Phys.D18:669-689,2009 | 10.1142/S0218271809014698 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform an analysis where Einstein's field equation is derived by means of
very simple thermodynamical arguments. Our derivation is based on a
consideration of the properties of a very small, spacelike two-plane in a
uniformly accelerating motion.
| [
{
"created": "Wed, 13 Dec 2006 10:28:38 GMT",
"version": "v1"
},
{
"created": "Thu, 10 May 2007 13:57:20 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Aug 2008 16:11:38 GMT",
"version": "v3"
}
] | 2010-11-11 | [
[
"Makela",
"Jarmo",
""
],
[
"Peltola",
"Ari",
""
]
] | We perform an analysis where Einstein's field equation is derived by means of very simple thermodynamical arguments. Our derivation is based on a consideration of the properties of a very small, spacelike two-plane in a uniformly accelerating motion. |
gr-qc/9710035 | Jai-chan Hwang | J. Hwang and H. Noh | Cosmological Vorticity in a Gravity with Quadratic Order Curvature
Couplings | 5 pages, revtex, no figures | Phys.Rev.D57:2617-2620,1998 | 10.1103/PhysRevD.57.2617 | null | gr-qc | null | We analyse the evolution of the rotational type cosmological perturbation in
a gravity with general quadratic order gravitational coupling terms. The result
is expressed independently of the generalized nature of the gravity theory, and
is simply interpreted as a conservation of the angular momentum.
| [
{
"created": "Tue, 7 Oct 1997 04:44:04 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Hwang",
"J.",
""
],
[
"Noh",
"H.",
""
]
] | We analyse the evolution of the rotational type cosmological perturbation in a gravity with general quadratic order gravitational coupling terms. The result is expressed independently of the generalized nature of the gravity theory, and is simply interpreted as a conservation of the angular momentum. |
gr-qc/9902009 | Amir H. Abbassi | Amir H. Abbassi | Non-Static Spherically Symmetric solution of Einstein vacuum Field
Equations with $Lambda$ | 9pages,no figures, Latex | JHEP 9904 (1999) 011 | 10.1088/1126-6708/1999/04/011 | null | gr-qc | null | The Schwarzschild-deSitter metric is the known solution of Einstein field
equations with cosmological constant term for vacuum spherically symmetric
space around a point mass M. Recently it has been reported that in a
$Lamda$-dominant world the Schwarzschild type coordinate systems are
disqualified by redshift-magnit... | [
{
"created": "Tue, 2 Feb 1999 17:50:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Abbassi",
"Amir H.",
""
]
] | The Schwarzschild-deSitter metric is the known solution of Einstein field equations with cosmological constant term for vacuum spherically symmetric space around a point mass M. Recently it has been reported that in a $Lamda$-dominant world the Schwarzschild type coordinate systems are disqualified by redshift-magnitud... |
1702.04720 | Mohd Shahalam | M. Shahalam, S. D. Pathak, Shiyuan Li, R. Myrzakulov, Anzhong Wang | Dynamics of coupled phantom and tachyon fields | 16 pages, 6 caption figures, 3 Tables, text, figure are added,
matches with the published version | Eur. Phys. J. C (2017) 77:686 | 10.1140/epjc/s10052-017-5255-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we apply the dynamical analysis to a coupled phantom field
with scaling potential taking particular forms of the coupling (linear and
combination of linear), and present phase space analysis. We investigate if
there exist late time accelerated scaling attractor that has the ratio of dark
energy and dar... | [
{
"created": "Wed, 15 Feb 2017 17:17:13 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Feb 2017 07:16:46 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Oct 2017 09:40:15 GMT",
"version": "v3"
}
] | 2017-10-24 | [
[
"Shahalam",
"M.",
""
],
[
"Pathak",
"S. D.",
""
],
[
"Li",
"Shiyuan",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we apply the dynamical analysis to a coupled phantom field with scaling potential taking particular forms of the coupling (linear and combination of linear), and present phase space analysis. We investigate if there exist late time accelerated scaling attractor that has the ratio of dark energy and dark ... |
2211.03497 | Breno Giacchini | Luca Buoninfante, Breno L. Giacchini and Tib\'erio de Paula Netto | Black holes in non-local gravity | Invited chapter for the Section "Nonlocal Quantum Gravity" of the
"Handbook of Quantum Gravity" (Eds. C. Bambi, L. Modesto and I.L. Shapiro,
Springer Singapore, expected in 2023). 29 pages | null | null | NORDITA 2022-076 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this chapter we present a status report of black hole-like solutions in
non-local theories of gravity in which the Lagrangians are at least quadratic
in curvature and contain specific non-polynomial (i.e., non-local) operators.
In the absence of exact black hole solutions valid in the whole spacetime, most
of the ... | [
{
"created": "Mon, 7 Nov 2022 12:39:25 GMT",
"version": "v1"
}
] | 2022-11-08 | [
[
"Buoninfante",
"Luca",
""
],
[
"Giacchini",
"Breno L.",
""
],
[
"Netto",
"Tibério de Paula",
""
]
] | In this chapter we present a status report of black hole-like solutions in non-local theories of gravity in which the Lagrangians are at least quadratic in curvature and contain specific non-polynomial (i.e., non-local) operators. In the absence of exact black hole solutions valid in the whole spacetime, most of the li... |
1512.02836 | Carlos Eduardo Cede\~no Monta\~na | C. E. Cede\~no M. and J. C. N. de Araujo | Master equation solutions in the linear regime of characteristic
formulation of general relativity | 19 pages | Phys. Rev. D 92, 124015 (2015) | 10.1103/PhysRevD.92.124015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the field equations in the linear regime of the characteristic
formulation of general relativity, Bishop, for a Schwarzschild's background,
and M\"adler, for a Minkowski's background, were able to show that it is
possible to derive a fourth order ordinary differential equation, called master
equation, for the $J... | [
{
"created": "Wed, 9 Dec 2015 12:36:56 GMT",
"version": "v1"
}
] | 2015-12-10 | [
[
"M.",
"C. E. Cedeño",
""
],
[
"de Araujo",
"J. C. N.",
""
]
] | From the field equations in the linear regime of the characteristic formulation of general relativity, Bishop, for a Schwarzschild's background, and M\"adler, for a Minkowski's background, were able to show that it is possible to derive a fourth order ordinary differential equation, called master equation, for the $J$ ... |
2104.11996 | Cristian Quinzacara | Fernando G\'omez, Samuel Lepe, Cristian Quinzacara and Patricio
Salgado | Five-dimensional Einstein-Chern-Simons cosmology | 14 pages, 2 figures | Phys. Rev. D 103, 104058 (2021) | 10.1103/PhysRevD.103.104058 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider a five-dimensional Einstein-Chern-Simons action which is composed
of a gravitational sector and a sector of matter, where the gravitational
sector is given by a Chern-Simons gravity action instead of the
Einstein-Hilbert action, and where the matter sector is given by a perfect
fluid. The gravitational la... | [
{
"created": "Sat, 24 Apr 2021 18:31:53 GMT",
"version": "v1"
}
] | 2021-05-28 | [
[
"Gómez",
"Fernando",
""
],
[
"Lepe",
"Samuel",
""
],
[
"Quinzacara",
"Cristian",
""
],
[
"Salgado",
"Patricio",
""
]
] | We consider a five-dimensional Einstein-Chern-Simons action which is composed of a gravitational sector and a sector of matter, where the gravitational sector is given by a Chern-Simons gravity action instead of the Einstein-Hilbert action, and where the matter sector is given by a perfect fluid. The gravitational lagr... |
gr-qc/0608002 | Larry Ford | Chun-Hsien Wu, Kin-Wang Ng, and L.H. Ford | Possible Constraints on the Duration of Inflationary Expansion from
Quantum Stress Tensor Fluctuations | 21 pages, no figures; Sect. IV rewritten and expanded, several
comments and references added | Phys.Rev.D75:103502,2007 | 10.1103/PhysRevD.75.103502 | null | gr-qc astro-ph hep-th | null | We discuss the effect of quantum stress tensor fluctuations in deSitter
spacetime upon the expansion of a congruence of timelike geodesics. We treat a
model in which the expansion fluctuations begin on a given hypersurface in
deSitter spacetime, and find that this effect tends to grow, in contrast to the
situation in... | [
{
"created": "Mon, 31 Jul 2006 21:57:00 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2007 00:59:30 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wu",
"Chun-Hsien",
""
],
[
"Ng",
"Kin-Wang",
""
],
[
"Ford",
"L. H.",
""
]
] | We discuss the effect of quantum stress tensor fluctuations in deSitter spacetime upon the expansion of a congruence of timelike geodesics. We treat a model in which the expansion fluctuations begin on a given hypersurface in deSitter spacetime, and find that this effect tends to grow, in contrast to the situation in f... |
1601.05932 | Ettore Minguzzi | E. Minguzzi | On the existence of smooth Cauchy steep time functions | Latex2e, 4 pages | Classical and Quantum Gravity 33 (2016) 115001 | 10.1088/0264-9381/33/11/115001 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple proof is given that every globally hyperbolic spacetime admits a
smooth Cauchy steep time function. This result is useful in order to show that
globally hyperbolic spacetimes can be isometrically embedded in Minkowski
spacetimes and that they spit as a product. The proof is based on a recent
result on the di... | [
{
"created": "Fri, 22 Jan 2016 09:57:16 GMT",
"version": "v1"
}
] | 2016-04-28 | [
[
"Minguzzi",
"E.",
""
]
] | A simple proof is given that every globally hyperbolic spacetime admits a smooth Cauchy steep time function. This result is useful in order to show that globally hyperbolic spacetimes can be isometrically embedded in Minkowski spacetimes and that they spit as a product. The proof is based on a recent result on the diff... |
1408.1896 | Pierre-Andr\'e Mandrin Ph.D. | Pierre-Andr\'e Mandrin | Spin-compatible construction of a consistent quantum gravity model from
minimum information | 9 pages, detailed information in relation to the poster presented at
the Symposium "Frontiers of Fundamental Physic" in July 2014. v2: "Tetrad
bath" instead of "stress bath"; cleaner notation of boundary integrals; use
of Gauss' law and S properly decomposed into generalised Palatini + torsion
terms | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article shows in detail the computations made for the poster presented
at the Symposium "Frontiers of Fundamental Physics" in July 2014. As was shown
in a previous publication, a quantum gravity formulation exists on the basis of
abstract quantum number conservation, the laws of thermodynamics, unspecific
intera... | [
{
"created": "Fri, 8 Aug 2014 16:03:09 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2014 21:37:40 GMT",
"version": "v2"
}
] | 2015-01-05 | [
[
"Mandrin",
"Pierre-André",
""
]
] | This article shows in detail the computations made for the poster presented at the Symposium "Frontiers of Fundamental Physics" in July 2014. As was shown in a previous publication, a quantum gravity formulation exists on the basis of abstract quantum number conservation, the laws of thermodynamics, unspecific interact... |
gr-qc/0303092 | Alicia Herrero | A. Herrero and M. Portilla | Effect of a non null pressure on the evolution of perturbations in the
matter dominated epoch | 6 figures, you will need some Mathematica fonts to see them correctly | null | null | null | gr-qc | null | We analyze the effect of pressure on the evolution of perturbations of an
Einstein-de Sitter Universe in the matter dominated epoch assuming an ideal gas
equation of state. For the sake of simplicity the temperature is considered
uniform. The goal of the paper is to examine the validity of the linear
approximation. W... | [
{
"created": "Mon, 24 Mar 2003 12:49:53 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Sep 2003 14:06:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Herrero",
"A.",
""
],
[
"Portilla",
"M.",
""
]
] | We analyze the effect of pressure on the evolution of perturbations of an Einstein-de Sitter Universe in the matter dominated epoch assuming an ideal gas equation of state. For the sake of simplicity the temperature is considered uniform. The goal of the paper is to examine the validity of the linear approximation. Wit... |
1111.5266 | Ivana Bochicchio Dr | Ivana Bochicchio and Valerio Faraoni | Cosmological expansion and local systems: a Lema\^{i}tre-Tolman-Bondi
model | null | General Relativity and Gravitation, Vol. 44 (2012) pp. 1479-1487 | 10.1007/s10714-012-1350-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a Lema\^{i}tre-Tolman-Bondi system mimicking a two-body system to
address the problem of the cosmological expansion versus local dynamics. This
system is strongly bound but participates in the cosmic expansion and is
exactly comoving with the cosmic substratum.
| [
{
"created": "Tue, 22 Nov 2011 17:59:27 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2012 11:00:12 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Jan 2013 13:48:52 GMT",
"version": "v3"
}
] | 2013-01-09 | [
[
"Bochicchio",
"Ivana",
""
],
[
"Faraoni",
"Valerio",
""
]
] | We propose a Lema\^{i}tre-Tolman-Bondi system mimicking a two-body system to address the problem of the cosmological expansion versus local dynamics. This system is strongly bound but participates in the cosmic expansion and is exactly comoving with the cosmic substratum. |
gr-qc/0204059 | Peter Dunsby | Naureen Goheer and Peter Dunsby | Braneworld Dynamics of Inflationary Cosmologies with Exponential
Potentials | 15 pages, 9 figures, RevTex 4. Submitted to Physical Review D | Phys.Rev. D66 (2002) 043527 | 10.1103/PhysRevD.66.043527 | null | gr-qc | null | In this work we consider Randall-Sundrum braneworld type scenarios, in which
the spacetime is described by a five-dimensional manifold with matter fields
confined in a domain wall or three-brane. We present the results of a
systematic analysis, using dynamical systems techniques, of the qualitative
behaviour of Fried... | [
{
"created": "Thu, 18 Apr 2002 05:29:35 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Goheer",
"Naureen",
""
],
[
"Dunsby",
"Peter",
""
]
] | In this work we consider Randall-Sundrum braneworld type scenarios, in which the spacetime is described by a five-dimensional manifold with matter fields confined in a domain wall or three-brane. We present the results of a systematic analysis, using dynamical systems techniques, of the qualitative behaviour of Friedma... |
gr-qc/0606053 | Oliver Rinne | Oliver Rinne | Stable radiation-controlling boundary conditions for the generalized
harmonic Einstein equations | 27 pages, 4 figures; more numerical results and references added,
several minor amendments; version accepted for publication in Class. Quantum
Grav | Class. Quantum Grav. 23, 6275-6300 (2006) | 10.1088/0264-9381/23/22/013 | null | gr-qc | null | This paper is concerned with the initial-boundary value problem for the
Einstein equations in a first-order generalized harmonic formulation. We impose
boundary conditions that preserve the constraints and control the incoming
gravitational radiation by prescribing data for the incoming fields of the Weyl
tensor. Hig... | [
{
"created": "Mon, 12 Jun 2006 19:01:56 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2006 20:13:32 GMT",
"version": "v2"
}
] | 2008-11-22 | [
[
"Rinne",
"Oliver",
""
]
] | This paper is concerned with the initial-boundary value problem for the Einstein equations in a first-order generalized harmonic formulation. We impose boundary conditions that preserve the constraints and control the incoming gravitational radiation by prescribing data for the incoming fields of the Weyl tensor. High-... |
2402.18750 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Wormholes supported by small extra dimensions | 7 pages, no figures | Adv. Studies Theor. Phys., vol. 18, no.1, pp. 41-48, 2024 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Holding a Morris-Thorne wormhole open requires a violation of the null energy
condition, calling for the need for so-called exotic matter near the throat.
Many researchers consider exotic matter to be completely unphysical in
classical general relativity. It has been shown, however, that the existence of
an extra mac... | [
{
"created": "Wed, 28 Feb 2024 23:11:22 GMT",
"version": "v1"
}
] | 2024-03-01 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Holding a Morris-Thorne wormhole open requires a violation of the null energy condition, calling for the need for so-called exotic matter near the throat. Many researchers consider exotic matter to be completely unphysical in classical general relativity. It has been shown, however, that the existence of an extra macro... |
2102.08339 | Massimiliano Maria Riva | Stavros Mougiakakos, Massimiliano Maria Riva and Filippo Vernizzi | Gravitational Bremsstrahlung in the Post-Minkowskian Effective Field
Theory | 11 pages, 1 figure | Phys. Rev. D 104, 024041 (2021) | 10.1103/PhysRevD.104.024041 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational radiation emitted during the scattering of two
spinless bodies in the post-Minkowskian Effective Field Theory approach. We
derive the conserved stress-energy tensor linearly coupled to gravity and the
classical probability amplitude of graviton emission at leading and
next-to-leading order ... | [
{
"created": "Tue, 16 Feb 2021 18:24:44 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2021 15:58:36 GMT",
"version": "v2"
}
] | 2021-07-21 | [
[
"Mougiakakos",
"Stavros",
""
],
[
"Riva",
"Massimiliano Maria",
""
],
[
"Vernizzi",
"Filippo",
""
]
] | We study the gravitational radiation emitted during the scattering of two spinless bodies in the post-Minkowskian Effective Field Theory approach. We derive the conserved stress-energy tensor linearly coupled to gravity and the classical probability amplitude of graviton emission at leading and next-to-leading order in... |
0803.3399 | Tomi Koivisto | Tomi Koivisto | Dynamics of Nonlocal Cosmology | 14 pages, 3 figures. V2: minor corrections | Phys.Rev.D77:123513,2008 | 10.1103/PhysRevD.77.123513 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonlocal quantum corrections to gravity have been recently proposed as a
possible solution to the cosmological fine tuning problems. We study the
dynamics of a class of nonlocal actions defined by a function of the inverse
d'Alembertian of the Ricci scalar. Power-law and expnential functions are
considered in detail,... | [
{
"created": "Mon, 24 Mar 2008 12:50:16 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jun 2008 09:33:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Koivisto",
"Tomi",
""
]
] | Nonlocal quantum corrections to gravity have been recently proposed as a possible solution to the cosmological fine tuning problems. We study the dynamics of a class of nonlocal actions defined by a function of the inverse d'Alembertian of the Ricci scalar. Power-law and expnential functions are considered in detail, b... |
1705.09633 | Yen Chin Ong | Zi-Yu Tang, Yen Chin Ong, Bin Wang | Lux in obscuro II: Photon Orbits of Extremal AdS Black Holes Revisited | 23 pages, 8 figures. Fixed some typos. Version accepted by CQG | null | 10.1088/1361-6382/aa95ff | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A large class of spherically symmetric static extremal black hole spacetimes
possesses a stable null photon sphere on their horizons. For the extremal
Kerr-Newman family, the photon sphere only really coincides with the horizon in
the sense clarified by Doran. The condition under which photon orbit is stable
on an as... | [
{
"created": "Fri, 26 May 2017 16:09:24 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2017 16:52:04 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Nov 2017 09:51:22 GMT",
"version": "v3"
}
] | 2017-11-06 | [
[
"Tang",
"Zi-Yu",
""
],
[
"Ong",
"Yen Chin",
""
],
[
"Wang",
"Bin",
""
]
] | A large class of spherically symmetric static extremal black hole spacetimes possesses a stable null photon sphere on their horizons. For the extremal Kerr-Newman family, the photon sphere only really coincides with the horizon in the sense clarified by Doran. The condition under which photon orbit is stable on an asym... |
2401.14643 | Qiaoyin Pan | Muxin Han, Qiaoyin Pan | Deficit Angles in 4D Spinfoam with Cosmological Constant: (Anti) de
Sitter-ness and More | a figure corrected | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/4.0/ | This paper investigates the critical behaviors of the 4-dimensional spinfoam
model with cosmological constant for a general 4-dimensional simplicial complex
as the discretization of spacetime. We find that, at the semi-classical regime,
the spinfoam amplitude is peaked at the real critical points that correspond to
z... | [
{
"created": "Fri, 26 Jan 2024 04:22:45 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2024 03:35:19 GMT",
"version": "v2"
}
] | 2024-02-15 | [
[
"Han",
"Muxin",
""
],
[
"Pan",
"Qiaoyin",
""
]
] | This paper investigates the critical behaviors of the 4-dimensional spinfoam model with cosmological constant for a general 4-dimensional simplicial complex as the discretization of spacetime. We find that, at the semi-classical regime, the spinfoam amplitude is peaked at the real critical points that correspond to zer... |
1311.4661 | Titus K Mathew | Titus K Mathew and P. Praseetha | Holographic Ricci dark energy and generalized second law | null | Mod.Phys.Lett. A29 (2014) no.06, 1450023 | 10.1142/S0217732314500230 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the validity of the generalized second law (GSL) of thermodynamics
in flat FRW universe with apparent horizon and event horizon as the boundary.
We found that in a universe with holographic Ricci dark energy and dark matter,
interacting with each other, the GSL is satisfied at the apparent horizon and
part... | [
{
"created": "Tue, 19 Nov 2013 09:12:14 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Nov 2013 09:02:24 GMT",
"version": "v2"
}
] | 2019-05-13 | [
[
"Mathew",
"Titus K",
""
],
[
"Praseetha",
"P.",
""
]
] | We explore the validity of the generalized second law (GSL) of thermodynamics in flat FRW universe with apparent horizon and event horizon as the boundary. We found that in a universe with holographic Ricci dark energy and dark matter, interacting with each other, the GSL is satisfied at the apparent horizon and partia... |
2304.03261 | Ahmad Sheykhi | A. Sheykhi and S. Ghaffari | Note on agegraphic dark energy inspired by modified Barrow entropy | 11 pages | Physics of the Dark Universe 41 (2023) 101241 | 10.1016/j.dark.2023.101241 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We revisit agegraphic dark energy (ADE) model when the entropy associated
with the apparent horizon is in the form of Barrow entropy, $S\sim
A^{1+\delta/2}$, where $0\leq\delta\leq1$ indicates the amount of the
quantum-gravitational deformation effects of the horizon. The modification to
the entropy expression, not o... | [
{
"created": "Thu, 6 Apr 2023 17:47:12 GMT",
"version": "v1"
}
] | 2023-05-18 | [
[
"Sheykhi",
"A.",
""
],
[
"Ghaffari",
"S.",
""
]
] | We revisit agegraphic dark energy (ADE) model when the entropy associated with the apparent horizon is in the form of Barrow entropy, $S\sim A^{1+\delta/2}$, where $0\leq\delta\leq1$ indicates the amount of the quantum-gravitational deformation effects of the horizon. The modification to the entropy expression, not onl... |
1906.08583 | Abbas Sherif | Abbas Sherif, Rituparno Goswami, Sunil D. Maharaj | On Properties of Expansion-free Dynamical Stars | 6 pages | Phys. Rev. D 100, 044039 (2019) | 10.1103/PhysRevD.100.044039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the geometrical and dynamical features of expansion-free dynamical
stars in general relativity. Such stars can exist only if particular physical
and geometric conditions are satisfied. Firstly, for trapping to exist in an
expansion-free dynamical star, the star must accelerate and radiate
simultaneously. If ... | [
{
"created": "Thu, 20 Jun 2019 12:49:16 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Aug 2019 23:22:44 GMT",
"version": "v2"
}
] | 2019-08-28 | [
[
"Sherif",
"Abbas",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | We study the geometrical and dynamical features of expansion-free dynamical stars in general relativity. Such stars can exist only if particular physical and geometric conditions are satisfied. Firstly, for trapping to exist in an expansion-free dynamical star, the star must accelerate and radiate simultaneously. If ei... |
gr-qc/9503060 | Bernard Linet | B. Linet | Vacuum polarization induced by a uniformly accelerated charge | 13 pages, latex, no figures, to appear in Int. J. Theor. Phys. | Int.J.Theor.Phys. 34 (1995) 1055-1064 | 10.1007/BF00671366 | GCR-941003 | gr-qc | null | We consider a point charge fixed in the Rindler coordinates which describe a
uniformly accelerated frame. We determine an integral expression of the induced
charge density due to the vacuum polarization at the first order in the fine
structure constant. In the case where the acceleration is weak, we give
explicitly t... | [
{
"created": "Thu, 30 Mar 1995 12:55:07 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Linet",
"B.",
""
]
] | We consider a point charge fixed in the Rindler coordinates which describe a uniformly accelerated frame. We determine an integral expression of the induced charge density due to the vacuum polarization at the first order in the fine structure constant. In the case where the acceleration is weak, we give explicitly the... |
gr-qc/0610059 | John W. Moffat | J. W. Moffat | Non-Singular Cosmology in Modified Gravity | 10 pages, no figures, Latex file. Revised version of paper | null | null | null | gr-qc | null | A non-singular cosmology is derived in modified gravity (MOG) with a varying
gravitational coupling strength $G(t)=G_N\xi(t)$. Assuming that the curvature
$k$, the cosmological constant $\Lambda$ and $\rho$ vanish at $t=0$, we obtain
a non-singular universe with a negative pressure, $p_G < 0$. Quantum
fluctuations at... | [
{
"created": "Wed, 11 Oct 2006 22:09:19 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Feb 2007 19:11:00 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Oct 2007 18:38:49 GMT",
"version": "v3"
}
] | 2007-10-24 | [
[
"Moffat",
"J. W.",
""
]
] | A non-singular cosmology is derived in modified gravity (MOG) with a varying gravitational coupling strength $G(t)=G_N\xi(t)$. Assuming that the curvature $k$, the cosmological constant $\Lambda$ and $\rho$ vanish at $t=0$, we obtain a non-singular universe with a negative pressure, $p_G < 0$. Quantum fluctuations at $... |
1206.3689 | Lorenzo Fatibene | L. Fatibene, M. Francaviglia, S.Garruto | Do Barbero-Immirzi connections exist in different dimensions and
signatures? | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We shall show that no reductive splitting of the spin group exists in
dimension 3 \leq m \leq 20 other than in dimension m = 4. In dimension 4 there
are reductive splittings in any signature. Euclidean and Lorentzian signatures
are reviewed in particular and signature (2, 2) is investigated explicitly in
detail. Redu... | [
{
"created": "Sat, 16 Jun 2012 18:44:21 GMT",
"version": "v1"
}
] | 2012-06-19 | [
[
"Fatibene",
"L.",
""
],
[
"Francaviglia",
"M.",
""
],
[
"Garruto",
"S.",
""
]
] | We shall show that no reductive splitting of the spin group exists in dimension 3 \leq m \leq 20 other than in dimension m = 4. In dimension 4 there are reductive splittings in any signature. Euclidean and Lorentzian signatures are reviewed in particular and signature (2, 2) is investigated explicitly in detail. Reduct... |
gr-qc/9901081 | N. K. Dadhich | Naresh Dadhich and A.K. Raychaudhuri | Oscillating non-singular relativistic spherical model | 6 pages, REVTEX version | Mod.Phys.Lett. A14 (1999) 2135-2138 | 10.1142/S0217732399002194 | IUCAA-5/99 | gr-qc | null | A particular choice of the time function in the recently presented spherical
solution by Dadhich [1] leads to a singularity free cosmological model which
oscillates between two regular states. The energy-stress tensor involves
anisotropic pressure and a heat flux term but is consistent with the usual
energy condition... | [
{
"created": "Thu, 28 Jan 1999 09:11:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dadhich",
"Naresh",
""
],
[
"Raychaudhuri",
"A. K.",
""
]
] | A particular choice of the time function in the recently presented spherical solution by Dadhich [1] leads to a singularity free cosmological model which oscillates between two regular states. The energy-stress tensor involves anisotropic pressure and a heat flux term but is consistent with the usual energy conditions ... |
2308.01812 | Daniela Cors | Daniela Cors, Sarah Renkhoff, Hannes R. R\"uter, David Hilditch and
Bernd Br\"ugmann | Formulation Improvements for Critical Collapse Simulations | 19 pages, 10 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The precise tuning required to observe critical phenomena in gravitational
collapse poses a challenge for most numerical codes. First, threshold
estimation searches may be obstructed by the appearance of coordinate
singularities, indicating the need for a better gauge choice. Second, the
constraint violations to whic... | [
{
"created": "Thu, 3 Aug 2023 15:17:42 GMT",
"version": "v1"
}
] | 2023-08-04 | [
[
"Cors",
"Daniela",
""
],
[
"Renkhoff",
"Sarah",
""
],
[
"Rüter",
"Hannes R.",
""
],
[
"Hilditch",
"David",
""
],
[
"Brügmann",
"Bernd",
""
]
] | The precise tuning required to observe critical phenomena in gravitational collapse poses a challenge for most numerical codes. First, threshold estimation searches may be obstructed by the appearance of coordinate singularities, indicating the need for a better gauge choice. Second, the constraint violations to which ... |
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