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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0606117 | Brandon Carter | Brandon Carter | Anthropic principle in cosmology | 6 pages, latex: contribution to Colloquium ``Cosmology: Facts and
problems'', Paris, 2004 | null | null | null | gr-qc | null | A brief explanation of the meaning of the anthropic principle - as a
prescription for the attribution of a priori probability weighting - is
illustrated by various cosmological and local applications, in which the
relevant conclusions are contrasted with those that could be obtained from
(less plausible) alternative ... | [
{
"created": "Tue, 27 Jun 2006 15:02:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carter",
"Brandon",
""
]
] | A brief explanation of the meaning of the anthropic principle - as a prescription for the attribution of a priori probability weighting - is illustrated by various cosmological and local applications, in which the relevant conclusions are contrasted with those that could be obtained from (less plausible) alternative pr... |
gr-qc/0507096 | Muraari Vasudevan | Muraari Vasudevan and Kory A. Stevens | Integrability of Particle Motion and Scalar Field Propagation in
Kerr-(Anti) de Sitter Black Hole Spacetimes in All Dimensions | 23 pages, LaTeX2e | Phys.Rev.D72:124008,2005 | 10.1103/PhysRevD.72.124008 | Alberta Thy 10-05 | gr-qc hep-th math-ph math.MP | null | We study the Hamilton-Jacobi and massive Klein-Gordon equations in the
general Kerr-(Anti) de Sitter black hole background in all dimensions. Complete
separation of both equations is carried out in cases when there are two sets of
equal black hole rotation parameters. We analyze explicitly the symmetry
properties of ... | [
{
"created": "Sat, 23 Jul 2005 02:58:14 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Vasudevan",
"Muraari",
""
],
[
"Stevens",
"Kory A.",
""
]
] | We study the Hamilton-Jacobi and massive Klein-Gordon equations in the general Kerr-(Anti) de Sitter black hole background in all dimensions. Complete separation of both equations is carried out in cases when there are two sets of equal black hole rotation parameters. We analyze explicitly the symmetry properties of th... |
2309.05991 | Zhao Li | Zhao Li, Jin Qiao, Tan Liu, Rui Niu, Shaoqi Hou, Tao Zhu, Wen Zhao | Gravitational Radiation from Eccentric Binary Black Hole System in
Dynamical Chern-Simons Gravity | 34 pages and 1 figure | JCAP05(2024)073 | 10.1088/1475-7516/2024/05/073 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Dynamical Chern-Simons (DCS) gravity, a typical parity-violating
gravitational theory, modifies both the generation and propagation of
gravitational waves from general relativity (GR). In this work, we derive the
gravitational waveform radiated from a binary black hole system with eccentric
orbits under the spin-alig... | [
{
"created": "Tue, 12 Sep 2023 06:40:42 GMT",
"version": "v1"
},
{
"created": "Wed, 22 May 2024 02:16:48 GMT",
"version": "v2"
}
] | 2024-05-24 | [
[
"Li",
"Zhao",
""
],
[
"Qiao",
"Jin",
""
],
[
"Liu",
"Tan",
""
],
[
"Niu",
"Rui",
""
],
[
"Hou",
"Shaoqi",
""
],
[
"Zhu",
"Tao",
""
],
[
"Zhao",
"Wen",
""
]
] | Dynamical Chern-Simons (DCS) gravity, a typical parity-violating gravitational theory, modifies both the generation and propagation of gravitational waves from general relativity (GR). In this work, we derive the gravitational waveform radiated from a binary black hole system with eccentric orbits under the spin-aligne... |
gr-qc/0311019 | Xinhe Meng | Xin-He Meng, Peng Wang (Nankai U.) | Gravitational potential in Palatini formulation of modified gravity | 5 pages, no figures | Gen.Rel.Grav. 36 (2004) 1947-1954 | 10.1023/B:GERG.0000036052.81522.fe | null | gr-qc | null | General Relativity has so far passed almost all the ground-based and
solar-system experiments. Any reasonable extended gravity models should
consistently reduce to it at least in the weak field approximation. In this
work we derive the gravitational potential for the Palatini formulation of the
modified gravity of th... | [
{
"created": "Thu, 6 Nov 2003 05:41:23 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Meng",
"Xin-He",
"",
"Nankai U."
],
[
"Wang",
"Peng",
"",
"Nankai U."
]
] | General Relativity has so far passed almost all the ground-based and solar-system experiments. Any reasonable extended gravity models should consistently reduce to it at least in the weak field approximation. In this work we derive the gravitational potential for the Palatini formulation of the modified gravity of the ... |
1606.05605 | Vladimir Popov | V. A. Popov and A. B. Balakin | Interaction of axions with relativistic spinning particles | null | JPCS 718 (2016) 042047 | 10.1088/1742-6596/718/4/042047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a covariant phenomenological model, which describes an
interaction between a pseudoscalar (axion) field and massive spinning
particles. The model extends the Bagrmann-Michel-Telegdy approach in
application to the axion electrodynamics. We present some exact solutions and
discuss them in the context of exp... | [
{
"created": "Fri, 17 Jun 2016 17:48:16 GMT",
"version": "v1"
}
] | 2016-06-20 | [
[
"Popov",
"V. A.",
""
],
[
"Balakin",
"A. B.",
""
]
] | We consider a covariant phenomenological model, which describes an interaction between a pseudoscalar (axion) field and massive spinning particles. The model extends the Bagrmann-Michel-Telegdy approach in application to the axion electrodynamics. We present some exact solutions and discuss them in the context of exper... |
2106.09666 | Bruno Le Floch | Bruno Le Floch, Philippe G. LeFloch, Gabriele Veneziano | Cyclic spacetimes through singularity scattering maps. Plane-symmetric
gravitational collisions | 34 pages: second half of the original arXiv:2005.11324 (now
shortened) | 2022 Class. Quantum Grav. 39 225010 | 10.1088/1361-6382/ac96c1 | CERN-TH-2021-094 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the plane-symmetric collision of two gravitational waves and
describe the global spacetime geometry generated by this collision. To this
end, we formulate the characteristic initial value problem for the Einstein
equations, when Goursat data describing the incoming waves are prescribed on
two null hypersurfa... | [
{
"created": "Thu, 17 Jun 2021 17:19:16 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Floch",
"Bruno Le",
""
],
[
"LeFloch",
"Philippe G.",
""
],
[
"Veneziano",
"Gabriele",
""
]
] | We study the plane-symmetric collision of two gravitational waves and describe the global spacetime geometry generated by this collision. To this end, we formulate the characteristic initial value problem for the Einstein equations, when Goursat data describing the incoming waves are prescribed on two null hypersurface... |
gr-qc/9610063 | Tevian Dray | Tevian Dray, George Ellis, Charles Hellaby, and Corinne Manogue | Gravity and Signature Change | Plain TeX, 6 pages; to appear in GRG | Gen.Rel.Grav. 29 (1997) 591-597 | 10.1023/A:1018895302693 | null | gr-qc | null | The use of proper ``time'' to describe classical ``spacetimes'' which contain
both Euclidean and Lorentzian regions permits the introduction of smooth
(generalized) orthonormal frames. This remarkable fact permits one to describe
both a variational treatment of Einstein's equations and distribution theory
using strai... | [
{
"created": "Sat, 26 Oct 1996 01:09:57 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Dray",
"Tevian",
""
],
[
"Ellis",
"George",
""
],
[
"Hellaby",
"Charles",
""
],
[
"Manogue",
"Corinne",
""
]
] | The use of proper ``time'' to describe classical ``spacetimes'' which contain both Euclidean and Lorentzian regions permits the introduction of smooth (generalized) orthonormal frames. This remarkable fact permits one to describe both a variational treatment of Einstein's equations and distribution theory using straigh... |
gr-qc/0701077 | Banibrata Mukhopadhyay | Banibrata Mukhopadhyay | Possible Neutrino-Antineutrino Oscillation Under Gravity and its
Consequences | 3 pages; contribution to appear in the Proceedings of the MG11
Meeting on General Relativity, Berlin, July 23-29, 2006; prepared on the
basis of the talk presented in the meeting; new version with updated
references | null | 10.1142/9789812834300_0061 | null | gr-qc astro-ph hep-ph | null | We show that under gravity the effective masses for neutrino and antineutrino
are different which opens a possible window of neutrino-antineutrino
oscillation even if the rest masses of the corresponding eigenstates are same.
This is due to CPT violation and possible to demonstrate if the neutrino mass
eigenstates ar... | [
{
"created": "Mon, 15 Jan 2007 05:31:27 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2007 05:24:25 GMT",
"version": "v2"
}
] | 2016-11-15 | [
[
"Mukhopadhyay",
"Banibrata",
""
]
] | We show that under gravity the effective masses for neutrino and antineutrino are different which opens a possible window of neutrino-antineutrino oscillation even if the rest masses of the corresponding eigenstates are same. This is due to CPT violation and possible to demonstrate if the neutrino mass eigenstates are ... |
1312.7419 | Ya-Peng Hu | Ya-Peng Hu, Hongsheng Zhang, Jun-Peng Hou and Liang-Zun Tang | Perihelion precession and deflection of light in the general spherically
symmetric spacetime | 13 pages, no figure, published version | Adv.High Energy Phys. 2014 (2014) 604321 | 10.1155/2014/604231 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the perihelion precession and deflection of light have been
investigated in the 4-dimensional general spherically symmetric spacetime, and
the main equation is obtained. As the application of this main equation, the
Reissner-Nordstorm-AdS solution and Clifton-Barrow solution in $f(R)$ gravity
have been... | [
{
"created": "Sat, 28 Dec 2013 10:31:24 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2014 13:15:24 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Nov 2014 14:34:04 GMT",
"version": "v3"
}
] | 2017-02-01 | [
[
"Hu",
"Ya-Peng",
""
],
[
"Zhang",
"Hongsheng",
""
],
[
"Hou",
"Jun-Peng",
""
],
[
"Tang",
"Liang-Zun",
""
]
] | In this paper, the perihelion precession and deflection of light have been investigated in the 4-dimensional general spherically symmetric spacetime, and the main equation is obtained. As the application of this main equation, the Reissner-Nordstorm-AdS solution and Clifton-Barrow solution in $f(R)$ gravity have been t... |
gr-qc/9610071 | Jorma Louko | Jorma Louko, Jonathan Z. Simon, and Stephen N. Winters-Hilt | Hamiltonian thermodynamics of a Lovelock black hole | 22 pages, REVTeX v3.0 | Phys.Rev.D55:3525-3535,1997 | 10.1103/PhysRevD.55.3525 | PP97--52, WISC--MILW--96--TH--26 | gr-qc hep-th | null | We consider the Hamiltonian dynamics and thermodynamics of spherically
symmetric spacetimes within a one-parameter family of five-dimensional Lovelock
theories. We adopt boundary conditions that make every classical solution part
of a black hole exterior, with the spacelike hypersurfaces extending from the
horizon bi... | [
{
"created": "Wed, 30 Oct 1996 22:56:56 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Louko",
"Jorma",
""
],
[
"Simon",
"Jonathan Z.",
""
],
[
"Winters-Hilt",
"Stephen N.",
""
]
] | We consider the Hamiltonian dynamics and thermodynamics of spherically symmetric spacetimes within a one-parameter family of five-dimensional Lovelock theories. We adopt boundary conditions that make every classical solution part of a black hole exterior, with the spacelike hypersurfaces extending from the horizon bifu... |
2212.08023 | Tamara Evstafyeva | Tamara Evstafyeva, Ulrich Sperhake, Thomas Helfer, Robin Croft, Miren
Radia, Bo-Xuan Ge, Eugene A. Lim | Unequal-mass boson-star binaries: Initial data and merger dynamics | 37 pages, 12 figures, to match published version in CQG | Class. Quantum Grav. 40 (2023) 085009 | 10.1088/1361-6382/acc2a8 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a generalization of the curative initial data construction derived
for equal-mass compact binaries in Helfer {\it et al} (2019 Phys. Rev. D 99
044046; 2022 Class. Quantum Grav. 39 074001) to arbitrary mass ratios. We
demonstrate how these improved initial data avoid substantial spurious
artifacts in the co... | [
{
"created": "Thu, 15 Dec 2022 18:33:21 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2022 18:51:18 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Apr 2023 08:49:23 GMT",
"version": "v3"
}
] | 2023-04-11 | [
[
"Evstafyeva",
"Tamara",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Helfer",
"Thomas",
""
],
[
"Croft",
"Robin",
""
],
[
"Radia",
"Miren",
""
],
[
"Ge",
"Bo-Xuan",
""
],
[
"Lim",
"Eugene A.",
""
]
] | We present a generalization of the curative initial data construction derived for equal-mass compact binaries in Helfer {\it et al} (2019 Phys. Rev. D 99 044046; 2022 Class. Quantum Grav. 39 074001) to arbitrary mass ratios. We demonstrate how these improved initial data avoid substantial spurious artifacts in the coll... |
2305.13719 | Bobir Toshmatov | Bobir Toshmatov, Zden\v{e}k Stuchl\'ik, Bobomurat Ahmedov | Can electromagnetic charge inhabit in Rastall gravity? | 7 pages, 1 figure, accepted for publication in Physics of the Dark
Universe | Physics of the Dark Universe 41, 101257 (2023) | 10.1016/j.dark.2023.101257 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | One of the eminent generalizations of theory of general relativity is the
Rastall gravity which was {constructed} based on the assumption of the
non-conserved energy-momentum tensor of the matter field. Despite in the
literature several solutions of black holes in the Rastall gravity coupled to
the electromagnetic fi... | [
{
"created": "Tue, 23 May 2023 06:14:28 GMT",
"version": "v1"
}
] | 2023-09-06 | [
[
"Toshmatov",
"Bobir",
""
],
[
"Stuchlík",
"Zdeněk",
""
],
[
"Ahmedov",
"Bobomurat",
""
]
] | One of the eminent generalizations of theory of general relativity is the Rastall gravity which was {constructed} based on the assumption of the non-conserved energy-momentum tensor of the matter field. Despite in the literature several solutions of black holes in the Rastall gravity coupled to the electromagnetic fiel... |
1110.2009 | Stefanos Aretakis | Stefanos Aretakis | Stability and Instability of Extreme Reissner-Nordstr\"om Black Hole
Spacetimes for Linear Scalar Perturbations II | 33 pages, 6 figures; published version of results contained in the
second part of arXiv:1006.0283, various new results added; Ann. Henri
Poincare, 2011, online first | Ann. Henri Poincare 8 (2011), 1491-1538 | 10.1007/s00023-011-0110-7 | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper contains the second part of a two-part series on the stability and
instability of extreme Reissner-Nordstrom spacetimes for linear scalar
perturbations. We continue our study of solutions to the linear wave equation
on a suitable globally hyperbolic subset of such a spacetime, arising from
regular initial ... | [
{
"created": "Mon, 10 Oct 2011 11:22:52 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Aretakis",
"Stefanos",
""
]
] | This paper contains the second part of a two-part series on the stability and instability of extreme Reissner-Nordstrom spacetimes for linear scalar perturbations. We continue our study of solutions to the linear wave equation on a suitable globally hyperbolic subset of such a spacetime, arising from regular initial da... |
0708.0620 | Fatimah Shojai | F. Shojai, and S. Molladavoudi | Quantum cosmology with varying speed of light and Bohmian trajectories | null | Gen.Rel.Grav.39:795-813,2007 | 10.1007/s10714-007-0421-7 | null | gr-qc | null | The classical trajectories for FLRW universe with varying speed of light are
obtained for the cases in which the cosmological constant depends or not depend
on the velocity of light. The theory is then quantized and the corresponding
WDW equation is solved. It is shown that the method of causal interpretation of
Bohm... | [
{
"created": "Sat, 4 Aug 2007 11:00:05 GMT",
"version": "v1"
}
] | 2010-01-25 | [
[
"Shojai",
"F.",
""
],
[
"Molladavoudi",
"S.",
""
]
] | The classical trajectories for FLRW universe with varying speed of light are obtained for the cases in which the cosmological constant depends or not depend on the velocity of light. The theory is then quantized and the corresponding WDW equation is solved. It is shown that the method of causal interpretation of Bohm c... |
gr-qc/0206062 | Alvaro Montero | J. Alberto Lobo, Alvaro Montero | Stochastic backgrounds of gravitational waves and spherical detectors | 19 pages | Class.Quant.Grav. 19 (2002) 6405-6416 | 10.1088/0264-9381/19/24/309 | null | gr-qc | null | The analysis of how a stochastic background of gravitational radiation
interacts with a spherical detector is given in detail, which leads to explicit
expressions for the system response functions, as well as for the
cross-correlation matrix of different readout channels. It is shown that
distinctive features of GW i... | [
{
"created": "Thu, 20 Jun 2002 15:25:02 GMT",
"version": "v1"
}
] | 2022-05-04 | [
[
"Lobo",
"J. Alberto",
""
],
[
"Montero",
"Alvaro",
""
]
] | The analysis of how a stochastic background of gravitational radiation interacts with a spherical detector is given in detail, which leads to explicit expressions for the system response functions, as well as for the cross-correlation matrix of different readout channels. It is shown that distinctive features of GW ind... |
2404.08735 | Thomas W. Baumgarte | Thomas W. Baumgarte and Stuart L. Shapiro | Primordial black holes captured by neutron stars: relativistic
point-mass treatment | 23 pages, 13 figures; matches version published in PRD | Phys. Rev. D 109, 123012 (2024) | 10.1103/PhysRevD.109.123012 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial black holes (PBHs), if they exist, may collide with and be
captured by neutron stars. We adopt a relativistic point-mass approximation to
study this capture, the subsequent confinement of the PBH of mass $m$ inside
the neutron star of mass $M_* \gg m$, and the PBH's growth by accretion of
stellar material.... | [
{
"created": "Fri, 12 Apr 2024 18:00:06 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jun 2024 19:13:16 GMT",
"version": "v2"
}
] | 2024-06-26 | [
[
"Baumgarte",
"Thomas W.",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | Primordial black holes (PBHs), if they exist, may collide with and be captured by neutron stars. We adopt a relativistic point-mass approximation to study this capture, the subsequent confinement of the PBH of mass $m$ inside the neutron star of mass $M_* \gg m$, and the PBH's growth by accretion of stellar material. B... |
0805.1834 | Jaakko Vainio | Tuomas Multam\"aki, Jaakko Vainio and Iiro Vilja | Maximal symmetry and metric-affine f(R) gravity | 7 pages | Class.Quant.Grav.26:075005,2009 | 10.1088/0264-9381/26/7/075005 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The affine connection in a space-time with a maximally symmetric spatial
subspace is derived using the properties of maximally symmetric tensors. The
number of degrees of freedom in metric-affine gravity is thereby considerably
reduced while the theory allows spatio-temporal torsion and remains non-metric.
The Ricci ... | [
{
"created": "Tue, 13 May 2008 12:39:20 GMT",
"version": "v1"
}
] | 2009-03-20 | [
[
"Multamäki",
"Tuomas",
""
],
[
"Vainio",
"Jaakko",
""
],
[
"Vilja",
"Iiro",
""
]
] | The affine connection in a space-time with a maximally symmetric spatial subspace is derived using the properties of maximally symmetric tensors. The number of degrees of freedom in metric-affine gravity is thereby considerably reduced while the theory allows spatio-temporal torsion and remains non-metric. The Ricci te... |
gr-qc/0003002 | Jose Wadih Maluf | A. A. Sousa and J. W. Maluf | Canonical Formulation of Gravitational Teleparallelism in 2+1 Dimensions
in Schwinger's Time Gauge | 17 pages, Latex file, no figures; a numerical coefficient has been
corrected and a different result is achieved | Prog.Theor.Phys. 104 (2000) 531-543 | 10.1143/PTP.104.531 | null | gr-qc | null | We consider the most general class of teleparallel gravitational {}{}theories
quadratic in the torsion tensor, in three space-time dimensions, and carry out
a detailed investigation of its Hamiltonian formulation in Schwinger's time
gauge. This general class is given by a family of three-parameter theories. A
consist... | [
{
"created": "Wed, 1 Mar 2000 19:30:38 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2000 12:09:39 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Sousa",
"A. A.",
""
],
[
"Maluf",
"J. W.",
""
]
] | We consider the most general class of teleparallel gravitational {}{}theories quadratic in the torsion tensor, in three space-time dimensions, and carry out a detailed investigation of its Hamiltonian formulation in Schwinger's time gauge. This general class is given by a family of three-parameter theories. A consisten... |
1912.00357 | Julia Tchemarina | Ju V Tchemarina, E G Alekseeva, A N Tsirulev and N K Nuraliev | Nonstationary self-gravitating configurations of scalar and
electromagnetic fields | 6 pages, 1 figure, presented at the 4th International Conference on
Particle Physics and Astrophysics (ICPPA-2018) | IOP Conf. Series: Journal of Physics: Conf. Series 1390 (2019)
012098 | 10.1088/1742-6596/1390/1/012098 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Mathematical modeling of gravitating configurations of physical fields is one
of the priority directions of the modern theory of gravity. Most of the exact
solutions constructed within the framework of the general relativity are static
or stationary configurations. This is due to the objective complexity of
solving t... | [
{
"created": "Sun, 1 Dec 2019 08:44:55 GMT",
"version": "v1"
}
] | 2019-12-03 | [
[
"Tchemarina",
"Ju V",
""
],
[
"Alekseeva",
"E G",
""
],
[
"Tsirulev",
"A N",
""
],
[
"Nuraliev",
"N K",
""
]
] | Mathematical modeling of gravitating configurations of physical fields is one of the priority directions of the modern theory of gravity. Most of the exact solutions constructed within the framework of the general relativity are static or stationary configurations. This is due to the objective complexity of solving the... |
2011.06705 | Teng Zhang | Teng Zhang, Ji\v{r}\'i Smetana, Yikang Chen, Joe Bentley, William E.
East, Denis Martynov, Haixing Miao, Huan Yang | Towards observing the neutron star collapse with gravitational wave
detectors | null | Phys. Rev. D 103, 044063 (2021) | 10.1103/PhysRevD.103.044063 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves from binary neutron star inspirals have been detected
along with the electromagnetic transients coming from the aftermath of the
merger in GW170817. However, much is still unknown about the post-merger
dynamics that connects these two sets of observables. This includes if, and
when, the post-merge... | [
{
"created": "Fri, 13 Nov 2020 00:32:28 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Zhang",
"Teng",
""
],
[
"Smetana",
"Jiří",
""
],
[
"Chen",
"Yikang",
""
],
[
"Bentley",
"Joe",
""
],
[
"East",
"William E.",
""
],
[
"Martynov",
"Denis",
""
],
[
"Miao",
"Haixing",
""
],
[
"Yang",
... | Gravitational waves from binary neutron star inspirals have been detected along with the electromagnetic transients coming from the aftermath of the merger in GW170817. However, much is still unknown about the post-merger dynamics that connects these two sets of observables. This includes if, and when, the post-merger ... |
gr-qc/9906080 | Edward N. Glass | E.N. Glass and J.P. Krisch (Department of Physics, University of
Michigan, Ann Arbor, Michgan) | Scale Symmetries of Spherical String Fluids | to appear in J. Math. Physics | J.Math.Phys. 40 (1999) 4056-4063 | 10.1063/1.532942 | null | gr-qc | null | We consider homothetic maps in a family of spherical relativistic star
models. A generalization of Vaidya's radiating metric provides a fluid
atmosphere of radiation and strings. The similarity structure of the string
fluid is investigated.
| [
{
"created": "Fri, 18 Jun 1999 00:35:06 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Glass",
"E. N.",
"",
"Department of Physics, University of\n Michigan, Ann Arbor, Michgan"
],
[
"Krisch",
"J. P.",
"",
"Department of Physics, University of\n Michigan, Ann Arbor, Michgan"
]
] | We consider homothetic maps in a family of spherical relativistic star models. A generalization of Vaidya's radiating metric provides a fluid atmosphere of radiation and strings. The similarity structure of the string fluid is investigated. |
gr-qc/9806100 | Luis Anchordoqui | Luis A. Anchordoqui | Brans-Dicke wormholes endowed with torsion | 3 pages revtex. To appear in Il Nuovo Cimento B | Nuovo Cim. B113 (1998) 1497-1501 | null | null | gr-qc | null | A two-way traversable wormhole solution in Brans-Dicke theory with torsion is
obtained using the method of massive thin shells. The solution goes over
general relativity for an infinite large value of the coupling parameter,
however, the Brans-Dicke scalar could never be the ``carrier'' of exoticity
that threads the ... | [
{
"created": "Thu, 25 Jun 1998 14:01:18 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Anchordoqui",
"Luis A.",
""
]
] | A two-way traversable wormhole solution in Brans-Dicke theory with torsion is obtained using the method of massive thin shells. The solution goes over general relativity for an infinite large value of the coupling parameter, however, the Brans-Dicke scalar could never be the ``carrier'' of exoticity that threads the wo... |
2110.02997 | Alexander Saffer | Alexander Saffer and Kent Yagi | Tidal Deformabilities of Neutron Stars in scalar-Gauss-Bonnet Gravity
and Their Applications to Multimessenger Tests of Gravity | 21 pages, 10 figures, updated to version accepted for publication in
Phys. Rev. D | null | 10.1103/PhysRevD.104.124052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacetime surrounding compact objects such as neutron stars and black
holes provides an excellent place to study gravity in the strong, non-linear,
dynamical regime. Here, the effects of strong curvature can leave their imprint
on observables which we may use to study gravity. Recently, NICER provided a
mass and ... | [
{
"created": "Wed, 6 Oct 2021 18:12:37 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2021 18:08:58 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Saffer",
"Alexander",
""
],
[
"Yagi",
"Kent",
""
]
] | The spacetime surrounding compact objects such as neutron stars and black holes provides an excellent place to study gravity in the strong, non-linear, dynamical regime. Here, the effects of strong curvature can leave their imprint on observables which we may use to study gravity. Recently, NICER provided a mass and ra... |
gr-qc/0604082 | Mehmet Cem Calik | M. Arik, M. C. Calik and M. B. Sheftel | Friedmann Equation for Brans Dicke Cosmology | minor reference changes | Int.J.Mod.Phys.D17:225-235,2008 | 10.1142/S0218271808011961 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of Brans-Dicke scalar tensor theory of gravitation, the
cosmological Friedmann equation which relates the expansion rate $H$ of the
universe to the various fractions of energy density is analyzed rigorously. It
is shown that Brans-Dicke scalar tensor theory of gravitation brings a
negligible correction... | [
{
"created": "Wed, 19 Apr 2006 19:16:03 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Apr 2006 12:22:14 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Sep 2007 10:06:21 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Sep 2008 15:33:56 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Arik",
"M.",
""
],
[
"Calik",
"M. C.",
""
],
[
"Sheftel",
"M. B.",
""
]
] | In the context of Brans-Dicke scalar tensor theory of gravitation, the cosmological Friedmann equation which relates the expansion rate $H$ of the universe to the various fractions of energy density is analyzed rigorously. It is shown that Brans-Dicke scalar tensor theory of gravitation brings a negligible correction t... |
1911.06325 | Nina Krylova | Halina Grushevskaya and Nina Krylova | Phase transitions in geometrothermodynamic model of charged
generalized-NUT black holes | null | null | 10.1088/1742-6596/1557/1/012024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modern cosmological models are constructed in the framework of thermodynamic
approaches developed within a Van der Waals-Maxwell theory of the first-order
phase transitions. In the present work we study a geometrothermodynamics of
two-dimensional first-order phase transition with the distribution of
relaxation times ... | [
{
"created": "Thu, 14 Nov 2019 18:03:37 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Grushevskaya",
"Halina",
""
],
[
"Krylova",
"Nina",
""
]
] | Modern cosmological models are constructed in the framework of thermodynamic approaches developed within a Van der Waals-Maxwell theory of the first-order phase transitions. In the present work we study a geometrothermodynamics of two-dimensional first-order phase transition with the distribution of relaxation times in... |
gr-qc/9311011 | Harald H. Soleng | Harald H. Soleng | Negative Energy Densities in Extended Sources Generating Closed Timelike
Curves in General Relativity with and without Torsion | (to be published in Phys. Rev. D), 5 pages, REVTEX 3.0, NORDITA 93/62
A (Sept. 10/Revised Nov. 1, 1993) | Phys.Rev.D49:1124-1125,1994 | 10.1103/PhysRevD.49.1124 | null | gr-qc | null | Near a spinning point particle in (2+1)-dimensional gravity (or near an
infinitely thin, straight, spinning string in 3+1 dimensions) there is a region
of space-time with closed timelike curves. Exact solutions for extended sources
with apparently physically acceptable energy-momentum tensors, have produced
the same ... | [
{
"created": "Mon, 8 Nov 1993 10:54:30 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Soleng",
"Harald H.",
""
]
] | Near a spinning point particle in (2+1)-dimensional gravity (or near an infinitely thin, straight, spinning string in 3+1 dimensions) there is a region of space-time with closed timelike curves. Exact solutions for extended sources with apparently physically acceptable energy-momentum tensors, have produced the same ex... |
1511.07332 | Jibril Ben Achour | Jibril Ben Achour | Towards self dual Loop Quantum Gravity | PhD Thesis - 254 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this PhD thesis, we introduced a new strategy to investigate the
kinematical and physical predictions of self dual Loop Quantum Gravity (LQG)
and by-passed the old problem of implementing quantum mechanically the so
called reality conditions inherent to the self dual Ashtekar's phase space.
We first review the l... | [
{
"created": "Mon, 23 Nov 2015 17:35:51 GMT",
"version": "v1"
}
] | 2015-11-24 | [
[
"Achour",
"Jibril Ben",
""
]
] | In this PhD thesis, we introduced a new strategy to investigate the kinematical and physical predictions of self dual Loop Quantum Gravity (LQG) and by-passed the old problem of implementing quantum mechanically the so called reality conditions inherent to the self dual Ashtekar's phase space. We first review the loop ... |
2209.05770 | Debika Chowdhury | Debika Chowdhury, Gianmassimo Tasinato, Ivonne Zavala | On the response of the Einstein Telescope to Doppler anisotropies | v1: 19+9 pages, 11 figures; v2: 21+9 pages, 10 figures, improved
version, published in Phys. Rev. D | null | 10.1103/PhysRevD.107.083516 | ET-0192A-22 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the response function of the Einstein Telescope to kinematic Doppler
anisotropies, which represent one of the guaranteed properties of the
stochastic gravitational wave background. If the frequency dependence of the
stochastic background changes slope within the detector frequency band, the
Doppler anisotrop... | [
{
"created": "Tue, 13 Sep 2022 07:09:48 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2023 13:03:31 GMT",
"version": "v2"
}
] | 2023-05-03 | [
[
"Chowdhury",
"Debika",
""
],
[
"Tasinato",
"Gianmassimo",
""
],
[
"Zavala",
"Ivonne",
""
]
] | We study the response function of the Einstein Telescope to kinematic Doppler anisotropies, which represent one of the guaranteed properties of the stochastic gravitational wave background. If the frequency dependence of the stochastic background changes slope within the detector frequency band, the Doppler anisotropic... |
2103.12583 | Jitendra Kumar Dr. | Amit Kumar Prasad and Jitendra Kumar | Anisotropic relativistic fluid spheres with a linear equation of state | arXiv admin note: text overlap with arXiv:1810.11324 by other authors | null | 10.1016/j.newast.2022.101815 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we present a class of relativistic and well-behaved solution to
Einstein's field equations for anisotropic matter distribution. We perform our
analysis by using the Buchdahl ansatz for the metric function grr. Three
different classes of new exact solution are found for anisotropy factor(delta).
We have ... | [
{
"created": "Tue, 23 Mar 2021 14:35:40 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Sep 2021 17:21:53 GMT",
"version": "v2"
}
] | 2022-03-29 | [
[
"Prasad",
"Amit Kumar",
""
],
[
"Kumar",
"Jitendra",
""
]
] | In this work, we present a class of relativistic and well-behaved solution to Einstein's field equations for anisotropic matter distribution. We perform our analysis by using the Buchdahl ansatz for the metric function grr. Three different classes of new exact solution are found for anisotropy factor(delta). We have an... |
2404.11373 | Costantino Pacilio | Costantino Pacilio, Swetha Bhagwat, Roberto Cotesta | Simulation-based inference of black hole ringdowns in the time domain | 12 pages, 7 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves emitted by a ringing black hole allow us to perform
precision tests of General Relativity in the strong field regime. With
improvements to our current gravitational wave detectors and upcoming
next-generation detectors, developing likelihood-free parameter inference
infrastructure is critical as w... | [
{
"created": "Wed, 17 Apr 2024 13:31:51 GMT",
"version": "v1"
}
] | 2024-04-18 | [
[
"Pacilio",
"Costantino",
""
],
[
"Bhagwat",
"Swetha",
""
],
[
"Cotesta",
"Roberto",
""
]
] | Gravitational waves emitted by a ringing black hole allow us to perform precision tests of General Relativity in the strong field regime. With improvements to our current gravitational wave detectors and upcoming next-generation detectors, developing likelihood-free parameter inference infrastructure is critical as we ... |
gr-qc/0512113 | Farook Rahaman | F.Rahaman, B.C.Bhui and P.Ghosh | Wormhole and C-field | 5 pages | Nuovo Cim.B119:1115-1119,2004 | 10.1393/ncb/i2004-10119-5 | null | gr-qc | null | It is well known that a C-field, generated by a certain source equation leads
to interesting changes in the cosmological solutions of Einstein's equations.
In this article we present and analyze a simple Lorentzian vacuum wormhole in
the presence of C-field.
| [
{
"created": "Tue, 20 Dec 2005 09:32:50 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Rahaman",
"F.",
""
],
[
"Bhui",
"B. C.",
""
],
[
"Ghosh",
"P.",
""
]
] | It is well known that a C-field, generated by a certain source equation leads to interesting changes in the cosmological solutions of Einstein's equations. In this article we present and analyze a simple Lorentzian vacuum wormhole in the presence of C-field. |
2207.01977 | Shu-Cheng Yang | Shu-Cheng Yang, Huijiao Luo, Yuan-Hao Zhang, Chen Zhang | Measurement of the central Galactic black hole by extremely large
mass-ratio inspirals | 19 pages, 8 figures | null | 10.3390/sym14122558 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Galaxy, extremely large mass-ratio inspirals(X-MRIs) composed of brown
dwarfs and the massive black hole at the Galactic Center are expected to be
promising gravitational wave sources for space-borne detectors. In this work,
we simulate the gravitational wave signals from twenty X-MRI systems by an
axisymmetri... | [
{
"created": "Tue, 5 Jul 2022 11:45:38 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Feb 2023 17:25:44 GMT",
"version": "v2"
}
] | 2023-02-14 | [
[
"Yang",
"Shu-Cheng",
""
],
[
"Luo",
"Huijiao",
""
],
[
"Zhang",
"Yuan-Hao",
""
],
[
"Zhang",
"Chen",
""
]
] | In the Galaxy, extremely large mass-ratio inspirals(X-MRIs) composed of brown dwarfs and the massive black hole at the Galactic Center are expected to be promising gravitational wave sources for space-borne detectors. In this work, we simulate the gravitational wave signals from twenty X-MRI systems by an axisymmetric ... |
1501.00462 | Hor\'acio Santana Vieira | H. S. Vieira, V. B. Bezerra, G. V. Silva | Analytic solutions in the dyon black hole with a cosmic string: scalar
fields, Hawking radiation and energy flux | 21 pages. arXiv admin note: substantial text overlap with
arXiv:1405.7846, arXiv:1401.5397, arXiv:1406.6884 | Annals of Physics 362 (2015) 576-592 | 10.1016/j.aop.2015.08.027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Charged massive scalar fields are considered in the gravitational and
electromagnetic field produced by a dyonic black hole with a cosmic string
along its axis of symmetry. Exact solutions of both angular and radial parts of
the covariant Klein-Gordon equation in this background are obtained, and are
given in terms o... | [
{
"created": "Fri, 2 Jan 2015 19:18:23 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2015 14:13:32 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Sep 2015 22:07:02 GMT",
"version": "v3"
}
] | 2015-09-15 | [
[
"Vieira",
"H. S.",
""
],
[
"Bezerra",
"V. B.",
""
],
[
"Silva",
"G. V.",
""
]
] | Charged massive scalar fields are considered in the gravitational and electromagnetic field produced by a dyonic black hole with a cosmic string along its axis of symmetry. Exact solutions of both angular and radial parts of the covariant Klein-Gordon equation in this background are obtained, and are given in terms of ... |
2403.00866 | Muhammad Sharif | M. Sharif and Madiha Ajmal | Generalized Ghost Dark Energy in f(Q) Gravity | 34 pages, 6 figures | Chinese J. Phys. 88(2024)706-721 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript, we use the correspondence principle to construct the
generalized ghost dark energy $f(Q)$ model, where $Q$ is the non-metricity. For
this purpose, we use the Friedman-Robertson-Walker universe model with
power-law scale factor. The energy density in this model linearly depends on
the Hubble parame... | [
{
"created": "Fri, 1 Mar 2024 02:25:05 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Sharif",
"M.",
""
],
[
"Ajmal",
"Madiha",
""
]
] | In this manuscript, we use the correspondence principle to construct the generalized ghost dark energy $f(Q)$ model, where $Q$ is the non-metricity. For this purpose, we use the Friedman-Robertson-Walker universe model with power-law scale factor. The energy density in this model linearly depends on the Hubble paramete... |
2205.05311 | Gianmassimo Tasinato | Gianmassimo Tasinato | Ultracompact vector stars | 23 pages, 4 figures | null | 10.1103/PhysRevD.106.044022 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We analytically investigate a new family of horizonless compact objects in
vector-tensor theories of gravity, called ultracompact vector stars. They are
sourced by a vector condensate, induced by a non-minimal coupling with gravity.
They can be as compact as black holes, thanks to their internal anisotropic
stress. I... | [
{
"created": "Wed, 11 May 2022 07:32:26 GMT",
"version": "v1"
}
] | 2022-08-31 | [
[
"Tasinato",
"Gianmassimo",
""
]
] | We analytically investigate a new family of horizonless compact objects in vector-tensor theories of gravity, called ultracompact vector stars. They are sourced by a vector condensate, induced by a non-minimal coupling with gravity. They can be as compact as black holes, thanks to their internal anisotropic stress. In ... |
gr-qc/0005053 | Abel Camacho Quintana | Abel Camacho (Astrophysikalisches Institut Potsdam) | Quantum Zeno effect and the detection of gravitomagnetism | Essay awarded with an ``honorable mention'' in the Annual Essay
Competition of the Gravity Research Foundation for the year 2000, four new
references, discussion enlarged, 9 pages. Accepted in International Journal
of Modern Physics D | Int.J.Mod.Phys.D10:9-14,2001 | 10.1142/S0218271801000949 | null | gr-qc quant-ph | null | In this work we introduce two experimental proposals that could shed some
light upon the inertial properties of intrinsic spin. In particular we will
analyze the role that the gravitomagnetic field of the Earth could have on a
quantum system with spin 1/2. We will deduce the expression for Rabi
transitions, which dep... | [
{
"created": "Mon, 15 May 2000 14:11:07 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Nov 2000 10:01:23 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Camacho",
"Abel",
"",
"Astrophysikalisches Institut Potsdam"
]
] | In this work we introduce two experimental proposals that could shed some light upon the inertial properties of intrinsic spin. In particular we will analyze the role that the gravitomagnetic field of the Earth could have on a quantum system with spin 1/2. We will deduce the expression for Rabi transitions, which depen... |
2109.07537 | Riccardo Sturani | Hebertt Leandro, Valerio Marra, Riccardo Sturani | Measuring the Hubble constant with black sirens | 10 pages, 12 figures. Typos corrected in v2 | Phys. Rev. D 105, 023523 (2022) | 10.1103/PhysRevD.105.023523 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a recently proposed method for measuring the Hubble constant
from gravitational wave detections of binary black hole coalescences without
electromagnetic counterparts. In the absence of a direct redshift measurement,
the missing information on the left-hand side of the Hubble-Lema\^itre law is
provided... | [
{
"created": "Wed, 15 Sep 2021 19:03:36 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jan 2022 23:58:00 GMT",
"version": "v2"
}
] | 2022-01-26 | [
[
"Leandro",
"Hebertt",
""
],
[
"Marra",
"Valerio",
""
],
[
"Sturani",
"Riccardo",
""
]
] | We investigate a recently proposed method for measuring the Hubble constant from gravitational wave detections of binary black hole coalescences without electromagnetic counterparts. In the absence of a direct redshift measurement, the missing information on the left-hand side of the Hubble-Lema\^itre law is provided b... |
gr-qc/9301019 | Yoshihisa Fujiwara | Y.Fujiwara, H.Ishihara and H.Kodama | Comments on Closed Bianchi Models | 14 pages with one table, KUCP-55 | Class.Quant.Grav.10:859-868,1993 | 10.1088/0264-9381/10/5/006 | null | gr-qc | null | We show several kinematical properties that are intrinsic to the Bianchi
models with compact spatial sections. Especially, with spacelike hypersurfaces
being closed, (A) no anisotropic expansion is allowed for Bianchi type V and
VII(A\not=0), and (B) type IV and VI(A\not=0,1) does not exist. In order to
show them, we... | [
{
"created": "Mon, 25 Jan 1993 08:48:29 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Fujiwara",
"Y.",
""
],
[
"Ishihara",
"H.",
""
],
[
"Kodama",
"H.",
""
]
] | We show several kinematical properties that are intrinsic to the Bianchi models with compact spatial sections. Especially, with spacelike hypersurfaces being closed, (A) no anisotropic expansion is allowed for Bianchi type V and VII(A\not=0), and (B) type IV and VI(A\not=0,1) does not exist. In order to show them, we p... |
1311.6984 | Eduardo Bittencourt | M. Novello and E. Bittencourt | The gravitational energy | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the expression $t_{\mu\nu}$ of the energy-momentum tensor of the
gravitational field in the framework of the recent proposal of the Geometric
Scalar theory of gravity (GSG). From the conservation of $t_{\mu\nu}$ it
follows the dynamics of the gravitational field. As an example of this
expression for $t_{\m... | [
{
"created": "Tue, 26 Nov 2013 20:06:59 GMT",
"version": "v1"
}
] | 2013-11-28 | [
[
"Novello",
"M.",
""
],
[
"Bittencourt",
"E.",
""
]
] | We present the expression $t_{\mu\nu}$ of the energy-momentum tensor of the gravitational field in the framework of the recent proposal of the Geometric Scalar theory of gravity (GSG). From the conservation of $t_{\mu\nu}$ it follows the dynamics of the gravitational field. As an example of this expression for $t_{\mu\... |
2205.12229 | Jonas Mureika | Roberto Casadio, Octavian Micu, Jonas Mureika | Newtonian approximation in (1 + 1) dimensions | Added references, expanded discussions | null | 10.1088/1402-4896/ac9e80 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possible existence of a Newtonian regime of gravity in $1+1$
dimensions, considering metrics in both the Kerr-Schild and conformal forms. In
the former case, the metric gives the exact solution of the Poisson equation in
flat space, but the weak-field limit of the solutions and the non-relativistic
regim... | [
{
"created": "Tue, 24 May 2022 17:37:19 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2022 20:10:26 GMT",
"version": "v2"
}
] | 2022-11-23 | [
[
"Casadio",
"Roberto",
""
],
[
"Micu",
"Octavian",
""
],
[
"Mureika",
"Jonas",
""
]
] | We study the possible existence of a Newtonian regime of gravity in $1+1$ dimensions, considering metrics in both the Kerr-Schild and conformal forms. In the former case, the metric gives the exact solution of the Poisson equation in flat space, but the weak-field limit of the solutions and the non-relativistic regime ... |
0710.1708 | Ujjal Debnath | Ujjal Debnath | Variable Modified Chaplygin Gas and Accelerating Universe | 7 Latex pages, 5 figures, revtex style | Astrophys.SpaceSci.312:295-299,2007 | 10.1007/s10509-007-9690-6 | null | gr-qc | null | In this letter, I have proposed a model of variable modified Chaplygin gas
and shown its role in accelerating phase of the universe. I have shown that the
equation of state of this model is valid from the radiation era to quiessence
model. The graphical representations of statefinder parameters characterize
different... | [
{
"created": "Tue, 9 Oct 2007 16:39:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Debnath",
"Ujjal",
""
]
] | In this letter, I have proposed a model of variable modified Chaplygin gas and shown its role in accelerating phase of the universe. I have shown that the equation of state of this model is valid from the radiation era to quiessence model. The graphical representations of statefinder parameters characterize different p... |
0802.2697 | Vanessa Andrade | E. P. Spaniol and V. C. de Andrade | Gravitomagnetism in teleparallel gravity | 25 pages. Submitted to International Journal of Modern Physics D.
Version 2: some new discussions, references added | Int.J.Mod.Phys.D19:489-505,2010 | 10.1142/S0218271810016476 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The assumption that matter charges and currents could generate fields, which
are called, by analogy with electromagnetism, gravitoeletric and
gravitomagnetic fields, dates from the origins of General Relativity (GR). On
the other hand, the Teleparallel Equivalent of GR (TEGR), as a gauge theory,
seems to be the ideal... | [
{
"created": "Tue, 19 Feb 2008 19:02:32 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2009 13:45:43 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jul 2009 18:08:15 GMT",
"version": "v3"
}
] | 2010-05-07 | [
[
"Spaniol",
"E. P.",
""
],
[
"de Andrade",
"V. C.",
""
]
] | The assumption that matter charges and currents could generate fields, which are called, by analogy with electromagnetism, gravitoeletric and gravitomagnetic fields, dates from the origins of General Relativity (GR). On the other hand, the Teleparallel Equivalent of GR (TEGR), as a gauge theory, seems to be the ideal s... |
2104.03137 | Kai Schwenzer | Brynmor Haskell and Kai Schwenzer | Gravitational waves from isolated neutron stars | To be published in "Handbook of Gravitational Wave Astronomy"; 27
pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutron star interiors are a fantastic laboratory for high density physics in
extreme environments. Probing this system with standard electromagnetic
observations is, however, a challenging endeavour, as the radiation tends to be
scattered by the outer layers and the interstellar medium. Gravitational waves,
on the o... | [
{
"created": "Wed, 7 Apr 2021 14:08:18 GMT",
"version": "v1"
}
] | 2021-04-08 | [
[
"Haskell",
"Brynmor",
""
],
[
"Schwenzer",
"Kai",
""
]
] | Neutron star interiors are a fantastic laboratory for high density physics in extreme environments. Probing this system with standard electromagnetic observations is, however, a challenging endeavour, as the radiation tends to be scattered by the outer layers and the interstellar medium. Gravitational waves, on the oth... |
gr-qc/9607050 | S. R. Schreckenberg | S. Schreckenberg | Symmetries of Decoherence Functionals | Submitted to Jour.Math.Phys.; 12 pages; Latex-document | J.Math.Phys. 38 (1997) 759-769 | 10.1063/1.531889 | Imperial/TP/95-96/49 | gr-qc quant-ph | null | The basic ingredients of the `consistent histories' approach to quantum
theory are a space $\UP$ of `history propositions' and a space $\D$ of
`decoherence functionals'. In this article we consider such history quantum
theories in the case where $\UP$ is given by the set of projectors $\P(\V)$ on
some Hilbert space $... | [
{
"created": "Tue, 23 Jul 1996 13:00:41 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Schreckenberg",
"S.",
""
]
] | The basic ingredients of the `consistent histories' approach to quantum theory are a space $\UP$ of `history propositions' and a space $\D$ of `decoherence functionals'. In this article we consider such history quantum theories in the case where $\UP$ is given by the set of projectors $\P(\V)$ on some Hilbert space $\V... |
0704.1998 | Alexander Kaganovich B. | E. I. Guendelman and A. B. Kaganovich | Absence of the Fifth Force Problem in a Model with Spontaneously Broken
Dilatation Symmetry | 23 pages, some explanations expanded, misprints corrected, reference
added | AnnalsPhys.323:866-882,2008 | 10.1016/j.aop.2007.09.003 | null | gr-qc astro-ph hep-th | null | A scale invariant model containing dilaton $\phi$ and dust (as a model of
matter) is studied where the shift symmetry $\phi\to\phi +const.$ is
spontaneously broken at the classical level due to intrinsic features of the
model. The dilaton to matter coupling "constant" $f$ appears to be dependent of
the matter density... | [
{
"created": "Mon, 16 Apr 2007 12:23:48 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Apr 2007 11:39:56 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Apr 2007 10:29:23 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Guendelman",
"E. I.",
""
],
[
"Kaganovich",
"A. B.",
""
]
] | A scale invariant model containing dilaton $\phi$ and dust (as a model of matter) is studied where the shift symmetry $\phi\to\phi +const.$ is spontaneously broken at the classical level due to intrinsic features of the model. The dilaton to matter coupling "constant" $f$ appears to be dependent of the matter density. ... |
gr-qc/9610072 | Jose Ademir Sales de Lima | A. Maia Jr.(Brown and Unicamp) and J. A. S. Lima (UFRN and Brown) | D-Dimensional Radiative Plasma: A Kinetic Approach | 28 pages, 1 figure, uses REVTEX | Class.Quant.Grav.15:2271-2288,1998 | 10.1088/0264-9381/15/8/011 | BROWN-HET-1059 | gr-qc | null | The covariant kinetic approach for the radiative plasma, a mixture of a
relativistic moving gas plus radiation quanta (photons, neutrinos, or
gravitons) is generalized to D spatial dimensions. The operational and physical
meaning of Eckart's temperature is reexamined and the D-dimensional expressions
for the transpor... | [
{
"created": "Thu, 31 Oct 1996 03:45:43 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Maia",
"A.",
"Jr.",
"Brown and Unicamp"
],
[
"Lima",
"J. A. S.",
"",
"UFRN and Brown"
]
] | The covariant kinetic approach for the radiative plasma, a mixture of a relativistic moving gas plus radiation quanta (photons, neutrinos, or gravitons) is generalized to D spatial dimensions. The operational and physical meaning of Eckart's temperature is reexamined and the D-dimensional expressions for the transport ... |
1601.02811 | Pedro Moraes | P.H.R.S. Moraes and J.R.L. Santos | A complete cosmological scenario from $f(R,T^\varphi)$ gravity theory | 10 pages, 6 figures | null | 10.1140/epjc/s10052-016-3912-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent elaborated by T. Harko and collaborators, the $f(R,T)$ theories of
gravity contemplate an optimistic alternative to dark energy, for which $R$ and
$T$ stand for the Ricci scalar and the trace of the energy-momentum tensor,
respectively. Although the literature has shown that the $T$ dependence on the
gravitati... | [
{
"created": "Tue, 12 Jan 2016 11:45:59 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Moraes",
"P. H. R. S.",
""
],
[
"Santos",
"J. R. L.",
""
]
] | Recent elaborated by T. Harko and collaborators, the $f(R,T)$ theories of gravity contemplate an optimistic alternative to dark energy, for which $R$ and $T$ stand for the Ricci scalar and the trace of the energy-momentum tensor, respectively. Although the literature has shown that the $T$ dependence on the gravitation... |
1912.07657 | Suvodip Mukherjee | Suvodip Mukherjee and Joseph Silk | Time-dependence of the astrophysical stochastic gravitational wave
background | 10 pages, 5 figures. A typographical error in the caption of Fig. 5
is corrected | MNRAS, Volume 491, Issue 4, February 2020, Pages 4690 | 10.1093/mnras/stz3226 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The astrophysical stochastic gravitational wave background (SGWB) is mostly
produced from unresolved stellar binary mergers, and the number of events at
any moment of time is expected to be Poisson-distributed. The event rate is
governed by several astrophysical processes. The Poisson nature leads to
variation in the... | [
{
"created": "Mon, 16 Dec 2019 19:42:20 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Feb 2020 14:32:52 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Apr 2020 16:50:27 GMT",
"version": "v3"
}
] | 2020-04-22 | [
[
"Mukherjee",
"Suvodip",
""
],
[
"Silk",
"Joseph",
""
]
] | The astrophysical stochastic gravitational wave background (SGWB) is mostly produced from unresolved stellar binary mergers, and the number of events at any moment of time is expected to be Poisson-distributed. The event rate is governed by several astrophysical processes. The Poisson nature leads to variation in the n... |
2301.03696 | Khalil El Bourakadi | K. El Bourakadi, M. Koussour, G. Otalora, M. Bennai, T. Ouali | Constant-roll and primordial black holes in f(Q,T) gravity | 18 pages, 5 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the consequence of the constant-roll condition
and examine the role of $f(Q,T)$ gravity in the cosmological inflation process.
We analyze the inflationary scenario by calculating modified Friedmann
equations, and giving an alternative technique that enables relating modified
slow-roll pa... | [
{
"created": "Mon, 9 Jan 2023 21:58:27 GMT",
"version": "v1"
}
] | 2023-01-11 | [
[
"Bourakadi",
"K. El",
""
],
[
"Koussour",
"M.",
""
],
[
"Otalora",
"G.",
""
],
[
"Bennai",
"M.",
""
],
[
"Ouali",
"T.",
""
]
] | In this study, we investigate the consequence of the constant-roll condition and examine the role of $f(Q,T)$ gravity in the cosmological inflation process. We analyze the inflationary scenario by calculating modified Friedmann equations, and giving an alternative technique that enables relating modified slow-roll para... |
gr-qc/0609033 | Mario Novello | M. Novello | Spinor Theory of Gravity | null | null | null | null | gr-qc astro-ph hep-th | null | The proposal of this work is to provide an answer to the following question:
is it possible to treat the metric of space-time - that in General Relativity
(GR) describes the gravitational interaction - as an effective geometry? In
other words, to obtain the dynamics of the metric tensor as a consequence of
the dynami... | [
{
"created": "Fri, 8 Sep 2006 13:43:05 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Sep 2006 12:08:28 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Oct 2006 12:22:06 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Novello",
"M.",
""
]
] | The proposal of this work is to provide an answer to the following question: is it possible to treat the metric of space-time - that in General Relativity (GR) describes the gravitational interaction - as an effective geometry? In other words, to obtain the dynamics of the metric tensor as a consequence of the dynamics... |
1305.7039 | Dmitry Shogin | Dmitry Shogin and Sigbjorn Hervik | Evolution of a Simple Inhomogeneous Anisotropic Cosmological Model with
Diffusion | 17 pages, 6 figures | JCAP10 (2013) 005 | 10.1088/1475-7516/2013/10/005 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a simple inhomogeneous anisotropic cosmology (plane symmetric
$G_2$ model) filled with a tilted perfect fluid undergoing velocity diffusion
on a scalar field. Considered are two types of fluid: dust and radiation. We
solve the system of Einstein field equations and diffusion equations
numerically and d... | [
{
"created": "Thu, 30 May 2013 09:29:06 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 2013 11:07:20 GMT",
"version": "v2"
}
] | 2014-11-13 | [
[
"Shogin",
"Dmitry",
""
],
[
"Hervik",
"Sigbjorn",
""
]
] | We investigate a simple inhomogeneous anisotropic cosmology (plane symmetric $G_2$ model) filled with a tilted perfect fluid undergoing velocity diffusion on a scalar field. Considered are two types of fluid: dust and radiation. We solve the system of Einstein field equations and diffusion equations numerically and dem... |
gr-qc/0003007 | Bernard J. Carr | B.J.Carr | A classification of spherically symmetric self-similar dust models | 30 pages, 4 figures available from author, to appear in PRD | Phys.Rev.D62:044022,2000 | 10.1103/PhysRevD.62.044022 | null | gr-qc | null | We classify all spherically symmetric dust solutions of Einstein's equations
which are self-similar in the sense that all dimensionless variables depend
only upon $z\equiv r/t$. We show that the equations can be reduced to a special
case of the general perfect fluid models with equation of state $p=\alpha \mu$.
The m... | [
{
"created": "Thu, 2 Mar 2000 17:43:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Carr",
"B. J.",
""
]
] | We classify all spherically symmetric dust solutions of Einstein's equations which are self-similar in the sense that all dimensionless variables depend only upon $z\equiv r/t$. We show that the equations can be reduced to a special case of the general perfect fluid models with equation of state $p=\alpha \mu$. The mos... |
0706.4284 | Kostadin Trencevski | Kostadin Trencevski and Emilija G. Celakoska | Geodetic precession and frame dragging observed far from massive objects
and close to a gyroscope | 11 pages | Central European Journal of Physics, 9(3) (2011), 654-661 | 10.2478/s11534-010-0102-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Total precession (geodetic precession and frame dragging) depends on the
velocity of each source of gravitation, which means that it depends on the
choice of the coordinate system. We consider the latter as an anomaly
specifically in the Gravity Probe B experiment, we investigated it and solved
this anomaly. Thus, we... | [
{
"created": "Thu, 28 Jun 2007 17:52:40 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jun 2007 07:07:55 GMT",
"version": "v2"
},
{
"created": "Sat, 15 Sep 2007 09:37:18 GMT",
"version": "v3"
},
{
"created": "Mon, 25 Nov 2013 07:59:26 GMT",
"version": "v4"
}
] | 2013-11-26 | [
[
"Trencevski",
"Kostadin",
""
],
[
"Celakoska",
"Emilija G.",
""
]
] | Total precession (geodetic precession and frame dragging) depends on the velocity of each source of gravitation, which means that it depends on the choice of the coordinate system. We consider the latter as an anomaly specifically in the Gravity Probe B experiment, we investigated it and solved this anomaly. Thus, we p... |
1407.4405 | Ivano Dami\~ao Soares | R. F. Aranha, I. Dami\~ao Soares and E. V. Tonini | Gravitational wave recoils in non-axisymmetric Robinson-Trautman
spacetimes | 10 pages, 5 figures. arXiv admin note: substantial text overlap with
arXiv:1403.4581, arXiv:1202.1271, arXiv:1111.1223 | null | 10.1140/epjc/s10052-014-3097-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the gravitational wave recoil waves and the associated net kick
velocities in non-axisymmetric Robinson-Trautman spacetimes. We use
characteristic initial data for the dynamics corresponding to non-head-on
collisions of black holes. We make a parameter study of the kick distributions,
corresponding to an e... | [
{
"created": "Wed, 16 Jul 2014 18:09:48 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Aranha",
"R. F.",
""
],
[
"Soares",
"I. Damião",
""
],
[
"Tonini",
"E. V.",
""
]
] | We examine the gravitational wave recoil waves and the associated net kick velocities in non-axisymmetric Robinson-Trautman spacetimes. We use characteristic initial data for the dynamics corresponding to non-head-on collisions of black holes. We make a parameter study of the kick distributions, corresponding to an ext... |
2008.03366 | Gerald Cleaver | B. Mattingly, A. Kar, M. Gorban, W. Julius, C. K. Watson, M. D. Ali,
A. Baas, C. Elmore, J. S. Lee, B. Shakerin, E. W. Davis, G. B. Cleaver | Curvature Invariants for the Accelerating Natario Warp Drive | 22 pages, 12 figures | Particles 3 (2020) 642-659 | 10.3390/particles3030042 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A process for using curvature invariants is applied to evaluate the
accelerating Natario warp drive. Curvature invariants are independent of
coordinate bases and plotting the invariants is free of coordinate mapping
distortions. While previous works focus mainly on the mathematical description
of the warp bubble, plo... | [
{
"created": "Fri, 7 Aug 2020 20:29:16 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2020 00:00:52 GMT",
"version": "v2"
}
] | 2020-09-30 | [
[
"Mattingly",
"B.",
""
],
[
"Kar",
"A.",
""
],
[
"Gorban",
"M.",
""
],
[
"Julius",
"W.",
""
],
[
"Watson",
"C. K.",
""
],
[
"Ali",
"M. D.",
""
],
[
"Baas",
"A.",
""
],
[
"Elmore",
"C.",
""
... | A process for using curvature invariants is applied to evaluate the accelerating Natario warp drive. Curvature invariants are independent of coordinate bases and plotting the invariants is free of coordinate mapping distortions. While previous works focus mainly on the mathematical description of the warp bubble, plott... |
2304.08046 | Anarya Ray | Anarya Ray, Ignacio Maga\~na Hernandez, Siddharth Mohite, Jolien
Creighton, Shasvath Kapadia | Non-parametric inference of the population of compact binaries from
gravitational wave observations using binned Gaussian processes | Upload accepted version | ApJ 957 37 (2023) | 10.3847/1538-4357/acf452 | LIGO-P2300098 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The observation of gravitational waves from multiple compact binary
coalescences by the LIGO-Virgo-KAGRA detector networks has enabled us to infer
the underlying distribution of compact binaries across a wide range of masses,
spins, and redshifts. In light of the new features found in the mass spectrum
of binary blac... | [
{
"created": "Mon, 17 Apr 2023 08:02:10 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Oct 2023 21:50:10 GMT",
"version": "v2"
}
] | 2023-11-01 | [
[
"Ray",
"Anarya",
""
],
[
"Hernandez",
"Ignacio Magaña",
""
],
[
"Mohite",
"Siddharth",
""
],
[
"Creighton",
"Jolien",
""
],
[
"Kapadia",
"Shasvath",
""
]
] | The observation of gravitational waves from multiple compact binary coalescences by the LIGO-Virgo-KAGRA detector networks has enabled us to infer the underlying distribution of compact binaries across a wide range of masses, spins, and redshifts. In light of the new features found in the mass spectrum of binary black ... |
1903.07092 | Shinji Tsujikawa | Shinji Tsujikawa | Lunar Laser Ranging constraints on nonminimally coupled dark energy and
standard sirens | 18 pages, 9 figures | Phys. Rev. D 100, 043510 (2019) | 10.1103/PhysRevD.100.043510 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In dark energy models where a scalar field $\phi$ is coupled to the Ricci
scalar $R$ of the form $e^{-2Q (\phi-\phi_0)/M_{\rm pl}}R$, where $Q$ is a
coupling constant, $\phi_0$ is today's value of $\phi$, and $M_{\rm pl}$ is the
reduced Planck mass, we study how the recent Lunar Laser Ranging (LLR)
experiment places ... | [
{
"created": "Sun, 17 Mar 2019 14:04:28 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Aug 2019 07:15:04 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Apr 2020 13:41:57 GMT",
"version": "v3"
}
] | 2020-04-29 | [
[
"Tsujikawa",
"Shinji",
""
]
] | In dark energy models where a scalar field $\phi$ is coupled to the Ricci scalar $R$ of the form $e^{-2Q (\phi-\phi_0)/M_{\rm pl}}R$, where $Q$ is a coupling constant, $\phi_0$ is today's value of $\phi$, and $M_{\rm pl}$ is the reduced Planck mass, we study how the recent Lunar Laser Ranging (LLR) experiment places co... |
2305.06748 | Pramit Rej | Pramit Rej, Abdelghani Errehymy and Mohammed Daoud | Charged strange star model in Tolman-Kuchowicz spacetime in the
background of 5D Einstein-Maxwell-Gauss-Bonnet gravity | 16 Pages, 11 Figures and 1 Table | Eur. Phys. J. C 83:392 (2023) | 10.1140/epjc/s10052-023-11562-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we provide a new model of static charged anisotropic fluid
sphere made of a charged perfect fluid in the context of 5D
Einstein-Maxwell-Gauss-Bonnet (EMGB) gravity theory. To generate exact
solutions of the EMGB field equations, we utilize the well-behaved
Tolman-Kuchowicz (TK) {\it ansatz} together ... | [
{
"created": "Thu, 11 May 2023 12:11:12 GMT",
"version": "v1"
}
] | 2023-05-12 | [
[
"Rej",
"Pramit",
""
],
[
"Errehymy",
"Abdelghani",
""
],
[
"Daoud",
"Mohammed",
""
]
] | In this article, we provide a new model of static charged anisotropic fluid sphere made of a charged perfect fluid in the context of 5D Einstein-Maxwell-Gauss-Bonnet (EMGB) gravity theory. To generate exact solutions of the EMGB field equations, we utilize the well-behaved Tolman-Kuchowicz (TK) {\it ansatz} together wi... |
0706.1233 | Stefano Ansoldi | Stefano Ansoldi and Eduardo I. Guendelman | Universes out of almost empty space | LaTeX (RevTeX), 4 pages, 1 figure. A few typos corrected and some
references added; structure streamlined (changes reflected in a slightly
modified abstract); small, non-substantial modifications in the figure | Prog.Theor.Phys.120:985-993,2008 | 10.1143/PTP.120.985 | KUNS-2095 | gr-qc hep-th | null | Baby universes (inflationary or non--inflationary) are regions of spacetime
that disconnect from the original ambient spacetime, which we take to be
asymptotically flat spacetime. A particular kind of baby universe solution,
involving string--like matter, is studied to show that it can be formed by
``investing'' an a... | [
{
"created": "Fri, 8 Jun 2007 19:53:08 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jun 2007 12:37:44 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Sep 2007 02:03:15 GMT",
"version": "v3"
}
] | 2008-12-25 | [
[
"Ansoldi",
"Stefano",
""
],
[
"Guendelman",
"Eduardo I.",
""
]
] | Baby universes (inflationary or non--inflationary) are regions of spacetime that disconnect from the original ambient spacetime, which we take to be asymptotically flat spacetime. A particular kind of baby universe solution, involving string--like matter, is studied to show that it can be formed by ``investing'' an arb... |
1904.12412 | Daniele Pranzetti | Emanuele Alesci, Sina Bahrami, Daniele Pranzetti | Quantum gravity predictions for black hole interior geometry | v2: 8 pages, 2 figures, wider class of states studied; published
version | Phys. Lett. B 797, 134908 (2019) | 10.1016/j.physletb.2019.134908 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous work we derived an effective Hamiltonian constraint for the
Schwarzschild geometry starting from the full loop quantum gravity Hamiltonian
constraint and computing its expectation value on coherent states sharply
peaked around a spherically symmetric geometry. We now use this effective
Hamiltonian to st... | [
{
"created": "Mon, 29 Apr 2019 01:11:09 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2019 10:51:28 GMT",
"version": "v2"
}
] | 2019-09-13 | [
[
"Alesci",
"Emanuele",
""
],
[
"Bahrami",
"Sina",
""
],
[
"Pranzetti",
"Daniele",
""
]
] | In a previous work we derived an effective Hamiltonian constraint for the Schwarzschild geometry starting from the full loop quantum gravity Hamiltonian constraint and computing its expectation value on coherent states sharply peaked around a spherically symmetric geometry. We now use this effective Hamiltonian to stud... |
1012.0085 | Muhammad Sharif | M. Sharif and Wajiha Javed | Kinematic Self-Similar Heat Conducting and Charge Solutions | 17 pages, no figure | Chin.J.Phys.48:546-559,2010 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The objective of this paper is to study the plane symmetric kinematic
self-similar heat conducting fluid and charge dust solutions of the Einstein
field equations. These solutions are classified according to self-similarity of
the first, second, zeroth and infinite kinds with different equations of state.
We take the... | [
{
"created": "Wed, 1 Dec 2010 02:55:35 GMT",
"version": "v1"
}
] | 2011-09-05 | [
[
"Sharif",
"M.",
""
],
[
"Javed",
"Wajiha",
""
]
] | The objective of this paper is to study the plane symmetric kinematic self-similar heat conducting fluid and charge dust solutions of the Einstein field equations. These solutions are classified according to self-similarity of the first, second, zeroth and infinite kinds with different equations of state. We take the s... |
gr-qc/9406009 | Higuchi | J. Bicak, C. Cris, P. Hajicek and A. Higuchi | Gauge-Symmetry Breakdown at the Horizon of Extreme Black Holes | 37 pages, LaTeX, preprint BUTP-94/5 | Class.Quant.Grav.12:479-498,1995 | 10.1088/0264-9381/12/2/017 | null | gr-qc | null | Static solutions of the Einstein-Yang-Mills-Higgs system containing extreme
black holes are studied. The field equations imply strong restrictions on
boundary values of all fields at the horizon. If the Yang-Mills radial electric
field $E$ is non-zero there, then all fields at the horizon take values in the
centraliz... | [
{
"created": "Sat, 4 Jun 1994 21:27:11 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Bicak",
"J.",
""
],
[
"Cris",
"C.",
""
],
[
"Hajicek",
"P.",
""
],
[
"Higuchi",
"A.",
""
]
] | Static solutions of the Einstein-Yang-Mills-Higgs system containing extreme black holes are studied. The field equations imply strong restrictions on boundary values of all fields at the horizon. If the Yang-Mills radial electric field $E$ is non-zero there, then all fields at the horizon take values in the centralizer... |
1310.8288 | Marc Favata | Marc Favata | Systematic parameter errors in inspiraling neutron star binaries | 5 pgs, 2 figures. V2: scope enlarged to include effects of neglecting
spin and orbit eccentricity on Love number error. Modified Fig. 2d. Other
minor changes in response to referees' comments. Matches published version | Phys. Rev. Lett. 112, 101101 (2014) | 10.1103/PhysRevLett.112.101101 | LIGO-P1300191 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The coalescence of two neutron stars is an important gravitational wave
source for LIGO and other detectors. Numerous studies have considered the
precision with which binary parameters (masses, spins, Love numbers) can be
measured. Here I consider the accuracy with which these parameters can be
determined in the pres... | [
{
"created": "Wed, 30 Oct 2013 19:54:08 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Mar 2014 23:06:19 GMT",
"version": "v2"
}
] | 2014-03-19 | [
[
"Favata",
"Marc",
""
]
] | The coalescence of two neutron stars is an important gravitational wave source for LIGO and other detectors. Numerous studies have considered the precision with which binary parameters (masses, spins, Love numbers) can be measured. Here I consider the accuracy with which these parameters can be determined in the presen... |
0708.2209 | Ivan S. N. Booth | Ivan Booth, Stephen Fairhurst | Extremality conditions for isolated and dynamical horizons | 13 pages, 4 figures, added reference; v3 appendix added with proof of
result from section IIID, some discussion and references added. Version to
appear in PRD | Phys.Rev.D77:084005,2008 | 10.1103/PhysRevD.77.084005 | null | gr-qc | null | A maximally rotating Kerr black hole is said to be extremal. In this paper we
introduce the corresponding restrictions for isolated and dynamical horizons.
These reduce to the standard notions for Kerr but in general do not require the
horizon to be either stationary or rotationally symmetric. We consider physical
im... | [
{
"created": "Thu, 16 Aug 2007 14:50:25 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2007 16:01:19 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Apr 2008 19:29:35 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Booth",
"Ivan",
""
],
[
"Fairhurst",
"Stephen",
""
]
] | A maximally rotating Kerr black hole is said to be extremal. In this paper we introduce the corresponding restrictions for isolated and dynamical horizons. These reduce to the standard notions for Kerr but in general do not require the horizon to be either stationary or rotationally symmetric. We consider physical impl... |
2108.06355 | Cole Kelson-Packer | Cole Kelson-Packer and John Belz | Boundary dynamics in competing critical black hole formation | 18 pages, 20 figures, 2 tables | null | 10.1103/PhysRevD.106.084063 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Expanding upon our previous study of competing critical phenomena in black
hole formation, we numerically investigate the behavior of dominant exponents
across the boundary separating asymptotically dispersing and collapsing regions
in a two-dimensional configuration space of initial data. We find that across
the Typ... | [
{
"created": "Fri, 13 Aug 2021 18:38:02 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 2021 18:12:33 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Oct 2022 17:14:22 GMT",
"version": "v3"
}
] | 2022-11-09 | [
[
"Kelson-Packer",
"Cole",
""
],
[
"Belz",
"John",
""
]
] | Expanding upon our previous study of competing critical phenomena in black hole formation, we numerically investigate the behavior of dominant exponents across the boundary separating asymptotically dispersing and collapsing regions in a two-dimensional configuration space of initial data. We find that across the Type ... |
1905.04764 | Jansen Formiga | J. B. Formiga | Conformal Teleparallel Theories and Weyl Geometry | 42 pages and 4 figures | Phys. Rev. D 99, 064047 (2019) | 10.1103/PhysRevD.99.064047 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite the fact that General Relativity (GR) has been very successful, many
alternative theories of gravity have attracted the attention of a significant
number of theoretical physicists. Among these theories, we have theories with
conformal symmetry. Here, the use of Weyl geometry to deal with conformal
teleparalle... | [
{
"created": "Sun, 12 May 2019 18:22:40 GMT",
"version": "v1"
}
] | 2019-05-14 | [
[
"Formiga",
"J. B.",
""
]
] | Despite the fact that General Relativity (GR) has been very successful, many alternative theories of gravity have attracted the attention of a significant number of theoretical physicists. Among these theories, we have theories with conformal symmetry. Here, the use of Weyl geometry to deal with conformal teleparallel ... |
1302.7248 | Mario Novello | M. Novello, E. Bittencourt and J. M. Salim | The Quasi-Maxwellian Equations of General Relativity: Applications to
the Perturbation Theory | The main goal of this review is to make a little more popular the use
of the JEK frame in the realm of perturbation theory of Friedman universes.
Indeed, the Lifshitz-Bardeen method and the JEK frame give the same results
for the perturbations in the linear regime. The main interest on JEK rests on
its unambigu... | null | 10.1007/s13538-014-0239-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A comprehensive review of the equations of general relativity in the
quasi-Maxwellian (QM) formalism introduced by Jordan, Ehlers and Kundt is made.
Our main interest concerns its applications to the analysis of the perturbation
of standard cosmology in the Friedman-Lema\^itre-Robertson-Walker framework.
The major ac... | [
{
"created": "Thu, 28 Feb 2013 16:30:55 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Novello",
"M.",
""
],
[
"Bittencourt",
"E.",
""
],
[
"Salim",
"J. M.",
""
]
] | A comprehensive review of the equations of general relativity in the quasi-Maxwellian (QM) formalism introduced by Jordan, Ehlers and Kundt is made. Our main interest concerns its applications to the analysis of the perturbation of standard cosmology in the Friedman-Lema\^itre-Robertson-Walker framework. The major achi... |
gr-qc/9807044 | Bernard Jancewicz | Bernard Jancewicz (University of Wroclaw) | Answer to Question 55: Are there pictorial examples that distinguish
covariant and contravariant vectors? | 4 pages in LaTeX, two figures | null | null | null | gr-qc | null | We present pictorial means of distinguishing contravariant vectors (or simply
vectors) from covariant vectors (or linear forms). When one depicts vector as
the directed segment, then the pictorial image of a linear form is a family of
equidistant parallel planes with an arrow joining the neighbouring planes and
showi... | [
{
"created": "Fri, 17 Jul 1998 11:28:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jancewicz",
"Bernard",
"",
"University of Wroclaw"
]
] | We present pictorial means of distinguishing contravariant vectors (or simply vectors) from covariant vectors (or linear forms). When one depicts vector as the directed segment, then the pictorial image of a linear form is a family of equidistant parallel planes with an arrow joining the neighbouring planes and showing... |
2011.14242 | Jordan Wilson-Gerow | Jordan Wilson-Gerow and P.C.E. Stamp | Propagators in the Correlated Worldline Theory of Quantum Gravity | 34 pages, 17 figures | Phys. Rev. D 105, 084015 (2022) | 10.1103/PhysRevD.105.084015 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from a formulation of Correlated Worldline (CWL) theory in terms of
functional integrals over paths, we define propagators for particles and matter
fields in this theory. We show that the most natural formulation of CWL theory
involves a rescaling of the generating functional for the theory; correlation
func... | [
{
"created": "Sun, 29 Nov 2020 00:31:10 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jan 2022 05:51:30 GMT",
"version": "v2"
}
] | 2022-04-14 | [
[
"Wilson-Gerow",
"Jordan",
""
],
[
"Stamp",
"P. C. E.",
""
]
] | Starting from a formulation of Correlated Worldline (CWL) theory in terms of functional integrals over paths, we define propagators for particles and matter fields in this theory. We show that the most natural formulation of CWL theory involves a rescaling of the generating functional for the theory; correlation functi... |
1503.04307 | Salvatore Vitale | Salvatore Vitale, Ryan Lynch, Riccardo Sturani, Philip Graff | Use of gravitational waves to probe the formation channels of compact
binaries | 6 pages, 2 figs. This version does not show the bias present in v1,
which was due to a small bug. Also updated to higher BH masses, more in line
with post-GW150914 era | Classic and Quantum Gravity Lett. Vor 34, No 3 L1 (2017) | 10.1088/1361-6382/aa552e | LIGO-P1500022 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the discovery of the binary black hole coalescence GW150914, the era of
gravitational-wave astrophysics has started. Gravitational-wave signals emitted
by compact binary coalescences will be detected in large number by LIGO and
Virgo in the coming months and years. Much about compact binaries is still
uncertain,... | [
{
"created": "Sat, 14 Mar 2015 13:59:47 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jun 2016 18:04:22 GMT",
"version": "v2"
}
] | 2017-03-15 | [
[
"Vitale",
"Salvatore",
""
],
[
"Lynch",
"Ryan",
""
],
[
"Sturani",
"Riccardo",
""
],
[
"Graff",
"Philip",
""
]
] | With the discovery of the binary black hole coalescence GW150914, the era of gravitational-wave astrophysics has started. Gravitational-wave signals emitted by compact binary coalescences will be detected in large number by LIGO and Virgo in the coming months and years. Much about compact binaries is still uncertain, i... |
gr-qc/9612012 | Herbert Liebl | W. Kummer, H. Liebl (Vienna, Tech. U.), D.V. Vassilevich (St.
Petersburg University) | Exact Path Integral Quantization of Generic 2-D Dilaton Gravity | 15 pages | Nucl.Phys. B493 (1997) 491-502 | 10.1016/S0550-3213(97)00143-0 | TUW-96-28 | gr-qc hep-th | null | Local path integral quantization of generic 2D dilaton gravity is considered.
Locality means that we assume asymptotic fall off conditions for all fields. We
demonstrate that in the absence of `matter' fields to all orders of
perturbation theory and for all 2D dilaton theories the quantum effective
action coincides w... | [
{
"created": "Wed, 4 Dec 1996 15:41:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kummer",
"W.",
"",
"Vienna, Tech. U."
],
[
"Liebl",
"H.",
"",
"Vienna, Tech. U."
],
[
"Vassilevich",
"D. V.",
"",
"St.\n Petersburg University"
]
] | Local path integral quantization of generic 2D dilaton gravity is considered. Locality means that we assume asymptotic fall off conditions for all fields. We demonstrate that in the absence of `matter' fields to all orders of perturbation theory and for all 2D dilaton theories the quantum effective action coincides wit... |
gr-qc/0206072 | Bernd Bruegmann | Miguel Alcubierre, Bernd Bruegmann, Peter Diener, Michael Koppitz,
Denis Pollney, Edward Seidel and Ryoji Takahashi | Gauge conditions for long-term numerical black hole evolutions without
excision | 19 pages, 14 figures, REVTeX, Added a missing Acknowledgment | Phys.Rev.D67:084023,2003 | 10.1103/PhysRevD.67.084023 | AEI-2002-037 | gr-qc | null | Numerical relativity has faced the problem that standard 3+1 simulations of
black hole spacetimes without singularity excision and with singularity
avoiding lapse and vanishing shift fail after an evolution time of around
30-40M due to the so-called slice stretching. We discuss lapse and shift
conditions for the non-... | [
{
"created": "Tue, 25 Jun 2002 16:17:52 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2002 09:09:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Bruegmann",
"Bernd",
""
],
[
"Diener",
"Peter",
""
],
[
"Koppitz",
"Michael",
""
],
[
"Pollney",
"Denis",
""
],
[
"Seidel",
"Edward",
""
],
[
"Takahashi",
"Ryoji",
""
]
] | Numerical relativity has faced the problem that standard 3+1 simulations of black hole spacetimes without singularity excision and with singularity avoiding lapse and vanishing shift fail after an evolution time of around 30-40M due to the so-called slice stretching. We discuss lapse and shift conditions for the non-ex... |
gr-qc/0001099 | Matt Visser | Matt Visser and Carlos Barcelo (Washington University in Saint Louis) | Energy conditions and their cosmological implications | Plenary talk presented at Cosmo99, Trieste, Sept/Oct 1999. 8 pages,
latex 209, World Scientific style file ltwol.sty (included) | null | 10.1142/9789812792129_0014 | null | gr-qc | null | The energy conditions of general relativity permit one to deduce very
powerful and general theorems about the behaviour of strong gravitational
fields and cosmological geometries. However, the energy conditions these
theorems are based on are beginning to look a lot less secure than they once
seemed: (1) there are su... | [
{
"created": "Fri, 28 Jan 2000 22:25:41 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Visser",
"Matt",
"",
"Washington University in Saint Louis"
],
[
"Barcelo",
"Carlos",
"",
"Washington University in Saint Louis"
]
] | The energy conditions of general relativity permit one to deduce very powerful and general theorems about the behaviour of strong gravitational fields and cosmological geometries. However, the energy conditions these theorems are based on are beginning to look a lot less secure than they once seemed: (1) there are subt... |
gr-qc/9410025 | P. Suntharothok-Priesmeyer | L. P. Grishchuk | Cosmological Perturbations of Quantum Mechanical Origin and Anisotropy
of the Microwave Background Radiation | 50 pages, To be Published in the Proceedings of the International
School of Astrophysics "D. Chalonge", Erice, 1994 | null | null | Preprint WUGRAV-94-11 | gr-qc astro-ph | null | A theory of quantum-mechanical generation of cosmological perturbations is
considered. The conclusion of this study is that if the large-angular-scale
anisotropy in the cosmic microwave background radiation is caused by the
long-wavelength cosmological perturbations of quantum mechanical origin, they
are, most likely... | [
{
"created": "Tue, 18 Oct 1994 19:58:53 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Grishchuk",
"L. P.",
""
]
] | A theory of quantum-mechanical generation of cosmological perturbations is considered. The conclusion of this study is that if the large-angular-scale anisotropy in the cosmic microwave background radiation is caused by the long-wavelength cosmological perturbations of quantum mechanical origin, they are, most likely, ... |
2404.02946 | Abdul Qadeer | Adnan Malik, Tayyaba Naz, Abdul Qadeer, M. Farasat Shamir, Z. Yousaf | Investigation of Traversable Wormhole Solutions in Modified $f(R)$
Gravity with Scalar Potential | 14 pages, 12 figures | Eur. Phys. J. C 83 (2023) 522 | 10.1140/epjc/s10052-023-11704-7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The objective of this manuscript is to investigate the traversable wormhole
solutions in the background of the $f(R, \phi)$ theory of gravity, where $R$ is
the Ricci scalar and $\phi$ is the scalar potential respectively. For this
reason, we use the Karmarkar criterion for traversable static wormhole geometry
to crea... | [
{
"created": "Wed, 3 Apr 2024 15:02:22 GMT",
"version": "v1"
}
] | 2024-04-05 | [
[
"Malik",
"Adnan",
""
],
[
"Naz",
"Tayyaba",
""
],
[
"Qadeer",
"Abdul",
""
],
[
"Shamir",
"M. Farasat",
""
],
[
"Yousaf",
"Z.",
""
]
] | The objective of this manuscript is to investigate the traversable wormhole solutions in the background of the $f(R, \phi)$ theory of gravity, where $R$ is the Ricci scalar and $\phi$ is the scalar potential respectively. For this reason, we use the Karmarkar criterion for traversable static wormhole geometry to create... |
gr-qc/0610100 | Vladimir Dzhunushaliev | V. Dzhunushaliev, H.-J. Schmidt, K. Myrzakulov and R. Myrzakulov | Thick brane solution with two scalar fields | 3 pages, 3 fig's, talk given at the Marcel Grossmann-11 conference | Proc. 11th M. Grossmann Meeting, 2008, part B, p. 1210-1212 | null | null | gr-qc | null | A new 5D thick brane solution is presented. We conjecture that the deduced
thick brane is a plane defect in a bulk gauge condensate.
| [
{
"created": "Fri, 20 Oct 2006 09:06:51 GMT",
"version": "v1"
},
{
"created": "Thu, 29 May 2008 12:12:36 GMT",
"version": "v2"
}
] | 2008-12-02 | [
[
"Dzhunushaliev",
"V.",
""
],
[
"Schmidt",
"H. -J.",
""
],
[
"Myrzakulov",
"K.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | A new 5D thick brane solution is presented. We conjecture that the deduced thick brane is a plane defect in a bulk gauge condensate. |
1604.02210 | Felipe Faria | F. F. Faria | Solar system tests for massive conformal gravity | v1: 10 pages, 2 figures; v2: 14 pages, 6 figures, several changes
(including the title); v3: 17 pages, 6 figures, matches the published version | Mod. Phys. Lett. A. 37, 2250033 (2022) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find the linearized gravitational field of a static spherically symmetric
mass distribution in massive conformal gravity and test it with some solar
system experiments. The result is that the theory agrees with the general
relativistic observations in the solar system for a determined lower bound on
the graviton m... | [
{
"created": "Fri, 8 Apr 2016 01:56:12 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2021 12:57:27 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Apr 2022 12:48:40 GMT",
"version": "v3"
}
] | 2022-04-05 | [
[
"Faria",
"F. F.",
""
]
] | We find the linearized gravitational field of a static spherically symmetric mass distribution in massive conformal gravity and test it with some solar system experiments. The result is that the theory agrees with the general relativistic observations in the solar system for a determined lower bound on the graviton mas... |
gr-qc/9502043 | Leo Brewin | Leo Brewin (Monash University) | Is the Regge Calculus a consistent approximation to General Relativity? | 27 pages, plain TeX, very belated update to match journal article | Gen.Rel.Grav. 32:897-918,2000 | 10.1023/A:1001937108480 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We will ask the question of whether or not the Regge calculus (and two
related simplicial formulations) is a consistent approximation to General
Relativity. Our criteria will be based on the behaviour of residual errors in
the discrete equations when evaluated on solutions of the Einstein equations.
We will show that... | [
{
"created": "Mon, 27 Feb 1995 14:19:15 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2011 14:12:58 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Brewin",
"Leo",
"",
"Monash University"
]
] | We will ask the question of whether or not the Regge calculus (and two related simplicial formulations) is a consistent approximation to General Relativity. Our criteria will be based on the behaviour of residual errors in the discrete equations when evaluated on solutions of the Einstein equations. We will show that f... |
1910.10691 | Sophia Jahns | Sophia Jahns | Photon sphere uniqueness in higher-dimensional electrovacuum spacetimes | null | null | 10.1088/1361-6382/ab5230 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show a uniqueness result for the n-dimensional spatial
Reissner-Nordstr\"om manifold: a static, electrovacuum, asymptotically flat
system which is asymptotically Reissner-Nordstr\"om is a subextremal
Reissner-Nordstr\"om manifold with positive mass, provided that its inner
boundary is a (possibly disconnected) pho... | [
{
"created": "Wed, 23 Oct 2019 17:47:53 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Jahns",
"Sophia",
""
]
] | We show a uniqueness result for the n-dimensional spatial Reissner-Nordstr\"om manifold: a static, electrovacuum, asymptotically flat system which is asymptotically Reissner-Nordstr\"om is a subextremal Reissner-Nordstr\"om manifold with positive mass, provided that its inner boundary is a (possibly disconnected) photo... |
2008.01376 | Chan Park | Dong-Hoon Kim, Chan Park | Detection of gravitational waves by light perturbation | null | Eur. Phys. J. C 81, 563 (2021) | 10.1140/epjc/s10052-021-09369-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light undergoes perturbation as gravitational waves pass by. This is shown by
solving Maxwell's equations in a spacetime with gravitational waves; a solution
exhibits a perturbation due to gravitational waves. We determine the
perturbation for a general case of both light and gravitational waves
propagating in arbitr... | [
{
"created": "Tue, 4 Aug 2020 07:18:02 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2020 04:04:54 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Nov 2020 14:11:49 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Mar 2021 04:59:43 GMT",
"version": "v4"
},
{
"cre... | 2021-07-05 | [
[
"Kim",
"Dong-Hoon",
""
],
[
"Park",
"Chan",
""
]
] | Light undergoes perturbation as gravitational waves pass by. This is shown by solving Maxwell's equations in a spacetime with gravitational waves; a solution exhibits a perturbation due to gravitational waves. We determine the perturbation for a general case of both light and gravitational waves propagating in arbitrar... |
gr-qc/0605033 | Michel Leclerc | M. Leclerc | Geodesic deviation and gravitational waves | conclusions changed | null | null | null | gr-qc | null | The detection of gravitational waves based on the geodesic deviation equation
is discussed. In particular, it is shown that the only non-vanishing components
of the wave field in the conventional traceless-transverse gauge in linearized
general relativity do not enter the geodesic deviation equation, and therefore,
a... | [
{
"created": "Fri, 5 May 2006 17:56:08 GMT",
"version": "v1"
},
{
"created": "Wed, 24 May 2006 20:25:48 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Leclerc",
"M.",
""
]
] | The detection of gravitational waves based on the geodesic deviation equation is discussed. In particular, it is shown that the only non-vanishing components of the wave field in the conventional traceless-transverse gauge in linearized general relativity do not enter the geodesic deviation equation, and therefore, app... |
1306.2320 | Michael P\"urrer | Michael P\"urrer, Mark Hannam, P. Ajith, Sascha Husa | Testing the validity of the single-spin approximation in
inspiral-merger-ringdown waveforms | 14 pages, 14 figures | null | 10.1103/PhysRevD.88.064007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave signals from black-hole binaries with non-precessing spins
are described by four parameters -- each black hole's mass and spin. It has
been shown that the dominant spin effects can be modeled by a \emph{single}
spin parameter, leading to the development of several \emph{three-parameter}
waveform mo... | [
{
"created": "Mon, 10 Jun 2013 20:00:07 GMT",
"version": "v1"
}
] | 2013-09-11 | [
[
"Pürrer",
"Michael",
""
],
[
"Hannam",
"Mark",
""
],
[
"Ajith",
"P.",
""
],
[
"Husa",
"Sascha",
""
]
] | Gravitational-wave signals from black-hole binaries with non-precessing spins are described by four parameters -- each black hole's mass and spin. It has been shown that the dominant spin effects can be modeled by a \emph{single} spin parameter, leading to the development of several \emph{three-parameter} waveform mode... |
1712.02205 | Valerio Faraoni | Valerio Faraoni, Dilek K. Ciftci, and Shawn D. Belknap-Keet | Symmetry of Brans-Dicke gravity as a novel solution-generating technique | Added new section on f(R) gravity, new references, and extra
explanation, typographical errors corrected. Matches version accepted in
Phys. Rev. D | Phys. Rev. D 97, 064004 (2018) | 10.1103/PhysRevD.97.064004 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A symmetry of Brans-Dicke gravity in (electro-)vacuo or in the presence of
conformally invariant matter is presented and used as a solution-generating
technique starting from a known solution as a seed. This novel technique is
applied to generate, as examples, new spatially homogeneous and isotropic
cosmologies, a 3-... | [
{
"created": "Wed, 6 Dec 2017 14:40:40 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Mar 2018 22:30:35 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Faraoni",
"Valerio",
""
],
[
"Ciftci",
"Dilek K.",
""
],
[
"Belknap-Keet",
"Shawn D.",
""
]
] | A symmetry of Brans-Dicke gravity in (electro-)vacuo or in the presence of conformally invariant matter is presented and used as a solution-generating technique starting from a known solution as a seed. This novel technique is applied to generate, as examples, new spatially homogeneous and isotropic cosmologies, a 3-pa... |
1706.06877 | Donato Bini | Donato Bini, Thibault Damour | Gravitational scattering of two black holes at the fourth post-Newtonian
approximation | 34 pages, n. 1 eps figure, revtex macros used | Phys. Rev. D 96, 064021 (2017) | 10.1103/PhysRevD.96.064021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the (center-of-mass frame) scattering angle $\chi$ of
hyperboliclike encounters of two spinning black holes, at the fourth
post-Newtonian approximation level for orbital effects, and at the
next-to-next-to-leading order for spin-dependent effects. We find it convenient
to compute the gauge-invariant scatte... | [
{
"created": "Wed, 21 Jun 2017 13:06:25 GMT",
"version": "v1"
}
] | 2017-09-20 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
]
] | We compute the (center-of-mass frame) scattering angle $\chi$ of hyperboliclike encounters of two spinning black holes, at the fourth post-Newtonian approximation level for orbital effects, and at the next-to-next-to-leading order for spin-dependent effects. We find it convenient to compute the gauge-invariant scatteri... |
1602.07232 | Leandro A. Oliveira | Lu\'is C. B. Crispino, Atsushi Higuchi, Leandro A. Oliveira, and
Ednilton S. de Oliveira | Tidal Forces in Reissner-Nordstr\"om Spacetimes | 7 pages, 5 figures. Accepted for publication in European Physical
Journal C | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the tidal forces produced in the spacetime of Reissner-Nordstr\"om
black holes. We point out that the radial component of the tidal force changes
sign just outside the event horizon if the charge-to-mass ratio is close to $1$
unlike in Schwarzschild spacetime of uncharged black holes, and that the
angular ... | [
{
"created": "Tue, 23 Feb 2016 16:58:46 GMT",
"version": "v1"
}
] | 2016-02-24 | [
[
"Crispino",
"Luís C. B.",
""
],
[
"Higuchi",
"Atsushi",
""
],
[
"Oliveira",
"Leandro A.",
""
],
[
"de Oliveira",
"Ednilton S.",
""
]
] | We analyze the tidal forces produced in the spacetime of Reissner-Nordstr\"om black holes. We point out that the radial component of the tidal force changes sign just outside the event horizon if the charge-to-mass ratio is close to $1$ unlike in Schwarzschild spacetime of uncharged black holes, and that the angular co... |
gr-qc/0110086 | Jose Natario | Jose Natario | Warp Drive With Zero Expansion | 8 pages, 3 figures; typos corrected, references added | Class.Quant.Grav. 19 (2002) 1157-1166 | 10.1088/0264-9381/19/6/308 | null | gr-qc | null | It is commonly believed that Alcubierre's warp drive works by contracting
space in front of the warp bubble and expanding space behind it. We show that
this expansion/contraction is but a marginal consequence of the choice made by
Alcubierre, and explicitly construct a similar spacetime where no
contraction/expansion... | [
{
"created": "Fri, 19 Oct 2001 16:27:12 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2001 15:19:37 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Mar 2002 16:04:00 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Natario",
"Jose",
""
]
] | It is commonly believed that Alcubierre's warp drive works by contracting space in front of the warp bubble and expanding space behind it. We show that this expansion/contraction is but a marginal consequence of the choice made by Alcubierre, and explicitly construct a similar spacetime where no contraction/expansion o... |
1208.3021 | Jun Wu | Y. J. Zhang, Q. Q. Zhu, J. Wu and P. T. Leung | Separation of spacetime and matter in polar oscillations of compact
stars | 25 pages, 3 figures and 4 tables | null | 10.1093/mnras/stt2428 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In polar oscillations of compact stars dynamical changes in spacetime and
matter are in general coupled together. Based on the theory of stellar
pulsation proposed by Allen et al. [Phys. Rev. D 58, 124012 (1998)], we
establish a feasible approximation scheme to separate spacetime from matter in
such oscillations. Two... | [
{
"created": "Wed, 15 Aug 2012 03:49:37 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Dec 2013 14:11:05 GMT",
"version": "v2"
}
] | 2013-12-18 | [
[
"Zhang",
"Y. J.",
""
],
[
"Zhu",
"Q. Q.",
""
],
[
"Wu",
"J.",
""
],
[
"Leung",
"P. T.",
""
]
] | In polar oscillations of compact stars dynamical changes in spacetime and matter are in general coupled together. Based on the theory of stellar pulsation proposed by Allen et al. [Phys. Rev. D 58, 124012 (1998)], we establish a feasible approximation scheme to separate spacetime from matter in such oscillations. Two i... |
2308.06519 | Aman Shukla | Aman Shukla, Rakesh Raushan, Raghavendra Chaubey | Dynamical Systems Analysis of $f(R, L_m)$ Gravity Model | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | In this paper, the expanding nature of the universe within the context of
$f(R, L_m)$ gravity theory, where $R$ is Ricci Scalar and $L_m$ is matter
Lagrangian, is explored. By employing a specific form $f(R, L_m) = \Lambda +
\frac{\alpha}{2} R + \beta L_m^n$, where $\Lambda$, $\alpha$, $\beta$, $n$ are
model paramete... | [
{
"created": "Sat, 12 Aug 2023 10:11:10 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2024 11:04:28 GMT",
"version": "v2"
}
] | 2024-02-23 | [
[
"Shukla",
"Aman",
""
],
[
"Raushan",
"Rakesh",
""
],
[
"Chaubey",
"Raghavendra",
""
]
] | In this paper, the expanding nature of the universe within the context of $f(R, L_m)$ gravity theory, where $R$ is Ricci Scalar and $L_m$ is matter Lagrangian, is explored. By employing a specific form $f(R, L_m) = \Lambda + \frac{\alpha}{2} R + \beta L_m^n$, where $\Lambda$, $\alpha$, $\beta$, $n$ are model parameters... |
gr-qc/9409015 | Jacob D. Bekenstein | Jacob D. Bekenstein | Do We Understand Black Hole Entropy ? | plain TeX, 18 pages, Plenary talk at Seventh Marcel Grossman meeting
at Stanford University, gr-qc/9409015, revised to include a figure | null | null | null | gr-qc astro-ph hep-th | null | I review various proposals for the nature of black hole entropy and for the
mechanism behind the operation of the generalized second law. I stress the
merits of entanglement entropy {\tenit qua\/} black hole entropy, and point out
that, from an operational viewpoint, entanglement entropy is perfectly finite.
Problems... | [
{
"created": "Thu, 8 Sep 1994 14:15:00 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 1994 14:56:00 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Bekenstein",
"Jacob D.",
""
]
] | I review various proposals for the nature of black hole entropy and for the mechanism behind the operation of the generalized second law. I stress the merits of entanglement entropy {\tenit qua\/} black hole entropy, and point out that, from an operational viewpoint, entanglement entropy is perfectly finite. Problems w... |
1307.4418 | Katerina Chatziioannou | Katerina Chatziioannou, Antoine Klein, Nicolas Yunes, Neil Cornish | Gravitational Waveforms for Precessing, Quasicircular Compact Binaries
with Multiple Scale Analysis: Small Spin Expansion | 37 pages, 14 figures, final published version | null | 10.1103/PhysRevD.88.063011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain analytical gravitational waveforms in the frequency-domain for
precessing, quasi-circular compact binaries with small spins, applicable, for
example, to binary neutron star inspirals. We begin by calculating an analytic
solution to the precession equations, obtained by expanding in the
dimensionless spin pa... | [
{
"created": "Tue, 16 Jul 2013 20:32:23 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Sep 2013 03:01:47 GMT",
"version": "v2"
}
] | 2013-10-01 | [
[
"Chatziioannou",
"Katerina",
""
],
[
"Klein",
"Antoine",
""
],
[
"Yunes",
"Nicolas",
""
],
[
"Cornish",
"Neil",
""
]
] | We obtain analytical gravitational waveforms in the frequency-domain for precessing, quasi-circular compact binaries with small spins, applicable, for example, to binary neutron star inspirals. We begin by calculating an analytic solution to the precession equations, obtained by expanding in the dimensionless spin para... |
1012.2443 | Francisco Lobo | Nadiezhda Montelongo Garcia, Francisco S. N. Lobo | Nonminimal curvature-matter coupled wormholes with matter satisfying the
null energy condition | 4 pages, 7 figures | Class.Quant.Grav.28:085018,2011 | 10.1088/0264-9381/28/8/085018 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, exact solutions of wormhole geometries supported by a nonminimal
curvature-matter coupling were found, where the nonminimal coupling minimizes
the violation of the null energy condition of normal matter at the throat. In
this brief report, we present a solution where normal matter satisfies the
energy condi... | [
{
"created": "Sat, 11 Dec 2010 10:36:49 GMT",
"version": "v1"
}
] | 2011-03-31 | [
[
"Garcia",
"Nadiezhda Montelongo",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | Recently, exact solutions of wormhole geometries supported by a nonminimal curvature-matter coupling were found, where the nonminimal coupling minimizes the violation of the null energy condition of normal matter at the throat. In this brief report, we present a solution where normal matter satisfies the energy conditi... |
2107.05841 | Mahmood Roshan | Mahmood Roshan and Bahram Mashhoon | Dynamical Friction in Nonlocal Gravity | 26 pages, 1 figure; v2: improved version to appear in ApJ; v3: typos
corrected, ref. [36] updated | Astrophys. J. 922, 9 (2021) | 10.3847/1538-4357/ac20d8 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dynamical friction in the Newtonian regime of nonlocal gravity
(NLG), which is a classical nonlocal generalization of Einstein's theory of
gravitation. The nonlocal aspect of NLG simulates dark matter. The attributes
of the resulting effective dark matter are described and the main physical
predictions of no... | [
{
"created": "Tue, 13 Jul 2021 04:30:20 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 2021 11:50:09 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Nov 2021 05:48:39 GMT",
"version": "v3"
}
] | 2021-11-17 | [
[
"Roshan",
"Mahmood",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | We study dynamical friction in the Newtonian regime of nonlocal gravity (NLG), which is a classical nonlocal generalization of Einstein's theory of gravitation. The nonlocal aspect of NLG simulates dark matter. The attributes of the resulting effective dark matter are described and the main physical predictions of nonl... |
0705.1163 | Andrew Janca | Andrew J. Janca | Spinning straight cosmic strings with flat exterior solutions
generically violate the weak energy condition | 2 pages, 1 figure | null | null | null | gr-qc | null | Any interior solution for a cylindrically symmetric, stationary cosmic string
with flat exterior, spinning around its longitudinal axis, and without internal
longitudinal currents ($g_{zz}=1$, $g_{tz}=0$), must somewhere violate the weak
energy condition of standard general relativity. Existing interior solutions
may... | [
{
"created": "Wed, 9 May 2007 17:48:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Janca",
"Andrew J.",
""
]
] | Any interior solution for a cylindrically symmetric, stationary cosmic string with flat exterior, spinning around its longitudinal axis, and without internal longitudinal currents ($g_{zz}=1$, $g_{tz}=0$), must somewhere violate the weak energy condition of standard general relativity. Existing interior solutions may b... |
gr-qc/0510072 | Clifford M. Will | Clifford M. Will | The Confrontation between General Relativity and Experiment | 89 pages, 8 figures; an update of the Living Review article
originally published in 2001; final published version incorporating referees'
suggestions | Living Rev.Rel.9:3,2005 | 10.12942/lrr-2006-3 | null | gr-qc | null | The status of experimental tests of general relativity and of theoretical
frameworks for analysing them is reviewed. Einstein's equivalence principle
(EEP) is well supported by experiments such as the Eotvos experiment, tests of
special relativity, and the gravitational redshift experiment. Future tests of
EEP and of... | [
{
"created": "Sun, 16 Oct 2005 02:17:06 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2006 03:18:15 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Will",
"Clifford M.",
""
]
] | The status of experimental tests of general relativity and of theoretical frameworks for analysing them is reviewed. Einstein's equivalence principle (EEP) is well supported by experiments such as the Eotvos experiment, tests of special relativity, and the gravitational redshift experiment. Future tests of EEP and of t... |
gr-qc/9902007 | Alexander Vilenkin | Alexander Vilenkin (Tufts University) | On the factor ordering problem in stochastic inflation | 7 pages, revtex | Phys. Rev. D 59, 123506 (1999) | 10.1103/PhysRevD.59.123506 | null | gr-qc hep-ph hep-th | null | The stochastic approach to inflation suffers from ambiguities due to the
arbitrary choice of the time variable and due to the choice of the factor
ordering in the corresponding Fokker-Planck equation. Here it is shown that
both ambiguities can be removed if we require that the factor ordering should
be set in such a ... | [
{
"created": "Mon, 1 Feb 1999 19:54:53 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Vilenkin",
"Alexander",
"",
"Tufts University"
]
] | The stochastic approach to inflation suffers from ambiguities due to the arbitrary choice of the time variable and due to the choice of the factor ordering in the corresponding Fokker-Planck equation. Here it is shown that both ambiguities can be removed if we require that the factor ordering should be set in such a wa... |
gr-qc/0109082 | Geoffrey K. Martin | Geoffrey Martin | Inflation and Global Equivalence | 16 pages, 1 eps figure, submitted for publication | null | null | null | gr-qc | null | This article investigates an extension of General Relativity based upon a
class of lifted metrics on the cotangent bundle of space-time. The dynamics of
the theory is determined by a fixed section of the cotangent bundle,
representing the momentum of a fluid flow, and Einstein's equations for the
fluid applied to the... | [
{
"created": "Mon, 24 Sep 2001 19:45:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Martin",
"Geoffrey",
""
]
] | This article investigates an extension of General Relativity based upon a class of lifted metrics on the cotangent bundle of space-time. The dynamics of the theory is determined by a fixed section of the cotangent bundle, representing the momentum of a fluid flow, and Einstein's equations for the fluid applied to the i... |
2201.05418 | N V Krishnendu | N. V. Krishnendu and Frank Ohme | Testing General Relativity with Gravitational Waves: An Overview | 21 pages, 7 figures, review article contributed as part of the
Special Issue on Current and Future Tests of General Relativity of the
journal Universe | Universe 2021, 7(12), 497 | 10.3390/universe7120497 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detections of gravitational-wave (GW) signals from compact binary
coalescence by ground-based detectors have opened up the era of GW astronomy.
These observations provide opportunities to test Einstein's general theory of
relativity at the strong-field regime. Here we give a brief overview of the
various GW-based... | [
{
"created": "Fri, 14 Jan 2022 12:24:56 GMT",
"version": "v1"
}
] | 2022-01-17 | [
[
"Krishnendu",
"N. V.",
""
],
[
"Ohme",
"Frank",
""
]
] | The detections of gravitational-wave (GW) signals from compact binary coalescence by ground-based detectors have opened up the era of GW astronomy. These observations provide opportunities to test Einstein's general theory of relativity at the strong-field regime. Here we give a brief overview of the various GW-based t... |
gr-qc/9703062 | Arthur Wasserman | J. A. Smoller and A. G. Wasserman (University of Michigan) | Reissner-Nordstrom-like solutions of the SU(2) Einstein-Yang/Mills (EYM)
equations | 5 pages, latex, no figures, Submitted to Comm. Math. Phys. January
15, 1997 | J.Math.Phys.38:6522-6559,1997 | 10.1063/1.532224 | null | gr-qc | null | In this paper we study a new type of solution of the spherically symmetric,
Einstein-Yang/Mills (EYM) equations with SU(2) gauge group. These solutions are
well-behaved in the far-field, and have a Reissner-Nordstrom type essential
singularity at the origin. These solutions display some novel features which
are not p... | [
{
"created": "Fri, 21 Mar 1997 20:29:51 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Smoller",
"J. A.",
"",
"University of Michigan"
],
[
"Wasserman",
"A. G.",
"",
"University of Michigan"
]
] | In this paper we study a new type of solution of the spherically symmetric, Einstein-Yang/Mills (EYM) equations with SU(2) gauge group. These solutions are well-behaved in the far-field, and have a Reissner-Nordstrom type essential singularity at the origin. These solutions display some novel features which are not pre... |
0911.5331 | Johannes Tambornino | Kristina Giesel, Johannes Tambornino, Thomas Thiemann | Born--Oppenheimer decomposition for quantum fields on quantum spacetimes | 38 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum Field Theory on Curved Spacetime (QFT on CS) is a well established
theoretical framework which intuitively should be a an extremely effective
description of the quantum nature of matter when propagating on a given
background spacetime. If one wants to take care of backreaction effects, then a
theory of quantu... | [
{
"created": "Fri, 27 Nov 2009 20:27:29 GMT",
"version": "v1"
}
] | 2009-11-30 | [
[
"Giesel",
"Kristina",
""
],
[
"Tambornino",
"Johannes",
""
],
[
"Thiemann",
"Thomas",
""
]
] | Quantum Field Theory on Curved Spacetime (QFT on CS) is a well established theoretical framework which intuitively should be a an extremely effective description of the quantum nature of matter when propagating on a given background spacetime. If one wants to take care of backreaction effects, then a theory of quantum ... |
gr-qc/0605054 | Roberto A. Sussman | A. Ulacia Rey, A. Perez Martinez, Roberto A. Sussman | Dynamics of a self--gravitating magnetized source | 7 pages, 1 figure | Int.J.Mod.Phys.D16:481-487,2007 | 10.1142/S0218271807010298 | null | gr-qc astro-ph hep-th | null | We consider a magnetized degenerate gas of fermions as the matter source of a
homogeneous but anisotropic Bianchi I spacetime with a Kasner--like metric. We
examine the dynamics of this system by means of a qualitative and numerical
study of Einstein-Maxwell field equations which reduce to a non--linear
autonomous sy... | [
{
"created": "Wed, 10 May 2006 01:55:56 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2008 00:15:28 GMT",
"version": "v2"
}
] | 2008-12-16 | [
[
"Rey",
"A. Ulacia",
""
],
[
"Martinez",
"A. Perez",
""
],
[
"Sussman",
"Roberto A.",
""
]
] | We consider a magnetized degenerate gas of fermions as the matter source of a homogeneous but anisotropic Bianchi I spacetime with a Kasner--like metric. We examine the dynamics of this system by means of a qualitative and numerical study of Einstein-Maxwell field equations which reduce to a non--linear autonomous syst... |
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