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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1112.5233 | Nobuhiko Misumi | Takahiro Kubota, Nobuhiko Misumi, Wade Naylor and Naoya Okuda (Osaka
U.) | The Conformal Transformation in General Single Field Inflation with
Non-Minimal Coupling | 15 pages, no figure, references added | JCAP02(2012)034 | 10.1088/1475-7516/2012/02/034 | OU-HET 737 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The method of a conformal transformation is applied to a general class of
single field inflation models with non-minimal coupling to gravity and
non-standard kinetic terms, in order to reduce the cosmological perturbative
calculation to the conventional minimal coupling case to all orders in
perturbation theory. Our ... | [
{
"created": "Thu, 22 Dec 2011 05:17:25 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Dec 2011 07:14:36 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Mar 2012 05:20:28 GMT",
"version": "v3"
}
] | 2012-03-19 | [
[
"Kubota",
"Takahiro",
"",
"Osaka\n U."
],
[
"Misumi",
"Nobuhiko",
"",
"Osaka\n U."
],
[
"Naylor",
"Wade",
"",
"Osaka\n U."
],
[
"Okuda",
"Naoya",
"",
"Osaka\n U."
]
] | The method of a conformal transformation is applied to a general class of single field inflation models with non-minimal coupling to gravity and non-standard kinetic terms, in order to reduce the cosmological perturbative calculation to the conventional minimal coupling case to all orders in perturbation theory. Our an... |
2108.01337 | Dehao Zhao | Mingzhe Li and Dehao Zhao | A simple parity violating model in the symmetric teleparallel gravity
and its cosmological perturbations | 13 pages, accepted for publication in PLB | Phys.Lett.B 827 (2022) 136968 | 10.1016/j.physletb.2022.136968 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parity violating gravity models based on the symmetric teleparallel
gravity have been considered in the literature, but their applications in
cosmology and especially the modifications to cosmological perturbations have
not been fully explored. In this paper we consider such a simple model which
modifies general ... | [
{
"created": "Tue, 3 Aug 2021 07:36:20 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2022 02:49:16 GMT",
"version": "v2"
}
] | 2022-03-08 | [
[
"Li",
"Mingzhe",
""
],
[
"Zhao",
"Dehao",
""
]
] | The parity violating gravity models based on the symmetric teleparallel gravity have been considered in the literature, but their applications in cosmology and especially the modifications to cosmological perturbations have not been fully explored. In this paper we consider such a simple model which modifies general re... |
1108.5161 | Stephen Taylor | Stephen R. Taylor, Jonathan R. Gair, Ilya Mandel | Hubble without the Hubble: cosmology using advanced gravitational-wave
detectors alone | 22 pages, 8 figures, 3 tables. Minor changes, including formatting,
to reflect published version. Some references updated and corrected | Phys. Rev. D 85, 023535 (2012) | 10.1103/PhysRevD.85.023535 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a novel approach to measuring the Hubble constant using
gravitational-wave (GW) signals from compact binaries by exploiting the
narrowness of the distribution of masses of the underlying neutron-star
population. Gravitational-wave observations with a network of detectors will
permit a direct, independe... | [
{
"created": "Thu, 25 Aug 2011 19:10:26 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2012 17:27:25 GMT",
"version": "v2"
}
] | 2012-01-31 | [
[
"Taylor",
"Stephen R.",
""
],
[
"Gair",
"Jonathan R.",
""
],
[
"Mandel",
"Ilya",
""
]
] | We investigate a novel approach to measuring the Hubble constant using gravitational-wave (GW) signals from compact binaries by exploiting the narrowness of the distribution of masses of the underlying neutron-star population. Gravitational-wave observations with a network of detectors will permit a direct, independent... |
1810.03478 | Sumanta Chakraborty | Sumanta Chakraborty, Supratik Pal and Soumitra SenGupta | Hilltop inflation and generation of helical magnetic field | v3, Invited article, Title changed, 24 pages, 4 figures and 1 table | Universe 8, 26 (2022) | 10.3390/universe8010026 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial magnetic field generated in the inflationary era can act as a
viable source for the present day intergalactic magnetic field of sufficient
strength. We present a fundamental origin for such a primordial generation of
the magnetic field, namely through anomaly cancellation of $U(1)$ gauge field
in quantum e... | [
{
"created": "Fri, 5 Oct 2018 15:31:21 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2019 07:04:55 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jan 2022 03:29:42 GMT",
"version": "v3"
}
] | 2022-01-20 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"Pal",
"Supratik",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | Primordial magnetic field generated in the inflationary era can act as a viable source for the present day intergalactic magnetic field of sufficient strength. We present a fundamental origin for such a primordial generation of the magnetic field, namely through anomaly cancellation of $U(1)$ gauge field in quantum ele... |
2407.06562 | De-Cheng Zou | Yukun Xu, Hyat Huang, Meng-Yun Lai and De-Cheng Zou | Identifying doppelgange Black Holes through Shadow Images | 20 pages, 13 figures, some references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, an interesting \textit{doppelg\"ange} black hole solution is
obtained in the string-inspired Euler-Heisenberg theory, where the black holes
have the same radii but share different charges. We found, however, they
possess different ISCOs and photon spheres, and hence affect their shadow
images. In this work,... | [
{
"created": "Tue, 9 Jul 2024 05:41:33 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2024 01:49:45 GMT",
"version": "v2"
}
] | 2024-07-23 | [
[
"Xu",
"Yukun",
""
],
[
"Huang",
"Hyat",
""
],
[
"Lai",
"Meng-Yun",
""
],
[
"Zou",
"De-Cheng",
""
]
] | Recently, an interesting \textit{doppelg\"ange} black hole solution is obtained in the string-inspired Euler-Heisenberg theory, where the black holes have the same radii but share different charges. We found, however, they possess different ISCOs and photon spheres, and hence affect their shadow images. In this work, w... |
gr-qc/0305007 | Valerio Bozza | V. Bozza, L. Mancini | Time Delay in Black Hole Gravitational Lensing as a Distance Estimator | 8 pages, 3 figures | Gen.Rel.Grav. 36 (2004) 435-450 | 10.1023/B:GERG.0000010486.58026.4f | null | gr-qc astro-ph | null | We calculate the time delay between different relativistic images formed by
black hole gravitational lensing in the strong field limit. For spherically
symmetric black holes, it turns out that the time delay between the first two
images is proportional to the minimum impact angle. Their ratio gives a very
interesting... | [
{
"created": "Fri, 2 May 2003 12:29:50 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Sep 2003 09:10:36 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bozza",
"V.",
""
],
[
"Mancini",
"L.",
""
]
] | We calculate the time delay between different relativistic images formed by black hole gravitational lensing in the strong field limit. For spherically symmetric black holes, it turns out that the time delay between the first two images is proportional to the minimum impact angle. Their ratio gives a very interesting a... |
1606.01769 | Anuradha Gupta | Anuradha Gupta and Achamveedu Gopakumar | Inspiral waveforms for spinning compact binaries in a new precessing
convention | 4 pages, 1 figures, published in the proceedings of Amaldi 11 | Journal of Physics: Conference Series 716 (2016) 012012 | 10.1088/1742-6596/716/1/012012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is customary to use a precessing convention, based on Newtonian orbital
angular momentum ${\bf L}_{\rm N}$, to model inspiral gravitational waves from
generic spinning compact binaries. A key feature of such a precessing
convention is its ability to remove all spin precession induced modulations
from the orbital p... | [
{
"created": "Mon, 6 Jun 2016 14:46:01 GMT",
"version": "v1"
}
] | 2019-09-17 | [
[
"Gupta",
"Anuradha",
""
],
[
"Gopakumar",
"Achamveedu",
""
]
] | It is customary to use a precessing convention, based on Newtonian orbital angular momentum ${\bf L}_{\rm N}$, to model inspiral gravitational waves from generic spinning compact binaries. A key feature of such a precessing convention is its ability to remove all spin precession induced modulations from the orbital pha... |
2009.10856 | Jens Boos | Jens Boos | Effects of Non-locality in Gravity and Quantum Theory | Comments welcome! Includes a didactic introduction into non-local
infinite-derivative "ghost-free" field theory. Ph.D. thesis, University of
Alberta. Supervisor: Prof. Valeri P. Frolov. 234 pages, 36 figures | null | null | null | gr-qc hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spacetime---the union of space and time---is both the actor and the stage
during physical processes in our fascinating Universe. In Lorentz invariant
local theories, the existence of a maximum signalling speed (the "speed of
light") determines a notion of causality in spacetime, distinguishing the past
from the futur... | [
{
"created": "Tue, 22 Sep 2020 23:26:29 GMT",
"version": "v1"
}
] | 2020-09-24 | [
[
"Boos",
"Jens",
""
]
] | Spacetime---the union of space and time---is both the actor and the stage during physical processes in our fascinating Universe. In Lorentz invariant local theories, the existence of a maximum signalling speed (the "speed of light") determines a notion of causality in spacetime, distinguishing the past from the future,... |
1011.5516 | Aurelien Barrau | Aurelien Barrau | Inflation and Loop Quantum Cosmology | 5 pages, Proceedings of the 35th International Conference on High
Energy Physics, Paris, 2010 (ICHEP 2010) | PoS ICHEP2010:461,2010 | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the one hand, inflation is an extremely convincing scenario: it solves
most cosmological paradoxes and generates fluctuations that became the seeds
for the growth of structures. It, however, suffers from a "naturalness"
problem: generating initial conditions for inflation is far from easy. On the
other hand, loop ... | [
{
"created": "Wed, 24 Nov 2010 21:29:58 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Barrau",
"Aurelien",
""
]
] | On the one hand, inflation is an extremely convincing scenario: it solves most cosmological paradoxes and generates fluctuations that became the seeds for the growth of structures. It, however, suffers from a "naturalness" problem: generating initial conditions for inflation is far from easy. On the other hand, loop qu... |
2312.05950 | Sheref Nasereldin | Sheref Nasereldin and Kayll Lake | Constructing maximal extensions of the Vaidya metric in Israel
coordinates: II. The completeness of Israel coordinates | 17 pages, 57 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present the results of an analysis of three maximal extensions of the
Vaidya metric in Israel coordinates, a spherically symmetric solution to the
Einstein field equations for the energy momentum tensor of pure radiation in
the high-frequency approximation. This metric is necessary for various
applications, such a... | [
{
"created": "Sun, 10 Dec 2023 17:40:46 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Dec 2023 10:40:38 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Dec 2023 14:55:33 GMT",
"version": "v3"
}
] | 2023-12-29 | [
[
"Nasereldin",
"Sheref",
""
],
[
"Lake",
"Kayll",
""
]
] | We present the results of an analysis of three maximal extensions of the Vaidya metric in Israel coordinates, a spherically symmetric solution to the Einstein field equations for the energy momentum tensor of pure radiation in the high-frequency approximation. This metric is necessary for various applications, such as ... |
1401.6066 | Loic Rolland | Virgo collaboration : T. Accadia, F. Acernese, M. Agathos, A. Allocca,
P. Astone, G. Ballardin, F. Barone, M. Barsuglia, A. Basti, Th. S. Bauer, M.
Bejger, M .G. Beker, C. Belczynski, D. Bersanetti, A. Bertolini, M. Bitossi,
M. A. Bizouard, M. Blom, M. Boer, F. Bondu, L. Bonelli, R. Bonnand, V.
Boschi, L. Bosi,... | Reconstruction of the gravitational wave signal $h(t)$ during the Virgo
science runs and independent validation with a photon calibrator | 35 pages, 16 figures. Accepted by CQG | T Accadia et al 2014 Class. Quantum Grav. 31 165013 | 10.1088/0264-9381/31/16/165013 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Virgo detector is a kilometer-scale interferometer for gravitational wave
detection located near Pisa (Italy). About 13 months of data were accumulated
during four science runs (VSR1, VSR2, VSR3 and VSR4) between May 2007 and
September 2011, with increasing sensitivity.
In this paper, the method used to reconst... | [
{
"created": "Thu, 23 Jan 2014 17:38:16 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jul 2014 11:49:22 GMT",
"version": "v2"
}
] | 2014-08-07 | [
[
"Virgo collaboration",
"",
""
],
[
"Accadia",
"T.",
""
],
[
"Acernese",
"F.",
""
],
[
"Agathos",
"M.",
""
],
[
"Allocca",
"A.",
""
],
[
"Astone",
"P.",
""
],
[
"Ballardin",
"G.",
""
],
[
"Barone",
... | The Virgo detector is a kilometer-scale interferometer for gravitational wave detection located near Pisa (Italy). About 13 months of data were accumulated during four science runs (VSR1, VSR2, VSR3 and VSR4) between May 2007 and September 2011, with increasing sensitivity. In this paper, the method used to reconstruct... |
1405.0526 | R. R. Cuzinatto | R. R. Cuzinatto, P. J. Pompeia, M. de Montigny, F. C. Khanna, J. M.
Hoff da Silva | Classic tests of General Relativity described by brane-based spherically
symmetric solutions | 18 pages. arXiv admin note: substantial text overlap with
arXiv:0903.2488 | Eur. Phys. J. C (2014) 74:3017 | 10.1140/epjc/s10052-014-3017-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a way to obtain information about higher dimensions from
observations by studying a brane-based spherically symmetric solution. The
three classic tests of General Relativity are analyzed in details: the
perihelion shift of the planet Mercury, the deflection of light by the Sun, and
the gravitational redshi... | [
{
"created": "Fri, 2 May 2014 22:17:38 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Sep 2014 19:17:11 GMT",
"version": "v2"
}
] | 2014-09-04 | [
[
"Cuzinatto",
"R. R.",
""
],
[
"Pompeia",
"P. J.",
""
],
[
"de Montigny",
"M.",
""
],
[
"Khanna",
"F. C.",
""
],
[
"da Silva",
"J. M. Hoff",
""
]
] | We discuss a way to obtain information about higher dimensions from observations by studying a brane-based spherically symmetric solution. The three classic tests of General Relativity are analyzed in details: the perihelion shift of the planet Mercury, the deflection of light by the Sun, and the gravitational redshift... |
1709.04172 | Stephane Collion | Stephane Collion and Michel Vaugon | A new approach to Kaluza-Klein Theory | 33 pages. Rewriting and improvement of a previous work. Version of
10/2022 : corrections after feed-back. arXiv admin note: substantial text
overlap with arXiv:1010.1516, arXiv:1709.04171 | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose in this paper a new approach to the Kaluza-Klein idea of a five
dimensional space-time unifying gravitation and electromagnetism, and extension
to higher-dimensional space-time. By considering a natural geometric definition
of a matter fluid and abandoning the usual requirement of a Ricci-flat five
dimensi... | [
{
"created": "Wed, 13 Sep 2017 08:04:21 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Sep 2017 20:50:13 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Oct 2017 10:14:57 GMT",
"version": "v3"
},
{
"created": "Fri, 14 Oct 2022 13:41:30 GMT",
"version": "v4"
}
] | 2022-10-17 | [
[
"Collion",
"Stephane",
""
],
[
"Vaugon",
"Michel",
""
]
] | We propose in this paper a new approach to the Kaluza-Klein idea of a five dimensional space-time unifying gravitation and electromagnetism, and extension to higher-dimensional space-time. By considering a natural geometric definition of a matter fluid and abandoning the usual requirement of a Ricci-flat five dimension... |
0802.2557 | Guglielmo Fucci | Guglielmo Fucci and Ivan G. Avramidi | Non-commutative Corrections in Spectral Matrix Gravity | 32 Pages, LaTex. Some nonessential typos in intermediate calculations
in sect. 3 and 4 are corrected. The final results are the same | Class.Quant.Grav.26:045019,2009 | 10.1088/0264-9381/26/4/045019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a non-commutative deformation of general relativity based on
spectral invariants of a partial differential operator acting on sections of a
vector bundle over a smooth manifold. We compute the first non-commutative
corrections to Einstein equations in the weak deformation limit and analyze the
spectrum of th... | [
{
"created": "Mon, 18 Feb 2008 21:58:03 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jan 2010 15:56:37 GMT",
"version": "v2"
}
] | 2011-02-17 | [
[
"Fucci",
"Guglielmo",
""
],
[
"Avramidi",
"Ivan G.",
""
]
] | We study a non-commutative deformation of general relativity based on spectral invariants of a partial differential operator acting on sections of a vector bundle over a smooth manifold. We compute the first non-commutative corrections to Einstein equations in the weak deformation limit and analyze the spectrum of the ... |
2109.12963 | Vinod Bhardwaj Dr. | Vinod Kumar Bhardwaj, Archana Dixit, Anirudh Pradhan, Symala
Krishannair | Renyi Holographic Dark Energy models in Teleparallel gravity | 19 pages, 13 figures | null | 10.1142/S0217751X22501780 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this paper, we have investigated the physical behavior of cosmological
models in the framework of modified Teleparallel gravity. This model is
established using a Renyi holographic ``dark energy model (RHDE) with a Hubble
cutoff. Here we have considered a homogeneous and isotropic Friedman universe
filled with per... | [
{
"created": "Mon, 27 Sep 2021 11:42:10 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jul 2022 12:06:21 GMT",
"version": "v2"
}
] | 2023-01-11 | [
[
"Bhardwaj",
"Vinod Kumar",
""
],
[
"Dixit",
"Archana",
""
],
[
"Pradhan",
"Anirudh",
""
],
[
"Krishannair",
"Symala",
""
]
] | In this paper, we have investigated the physical behavior of cosmological models in the framework of modified Teleparallel gravity. This model is established using a Renyi holographic ``dark energy model (RHDE) with a Hubble cutoff. Here we have considered a homogeneous and isotropic Friedman universe filled with perfe... |
2304.01263 | Oliver Friedrich | Ashmeet Singh and Oliver Friedrich | Emergence of Gravitational Potential and Time Dilation from
Non-interacting Systems Coupled to a Global Quantum Clock | Essay written for the Gravity Research Foundation's 2023 Awards for
Essays on Gravitation | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | We study gravitational back-reaction within relational time formulations of
quantum mechanics by considering two versions of time: a time coordinate,
modelled as a global quantum degree of freedom, and the proper time of a given
physical system, modelled via an internal degree of freedom serving as a local
quantum "c... | [
{
"created": "Mon, 3 Apr 2023 18:00:26 GMT",
"version": "v1"
}
] | 2023-04-14 | [
[
"Singh",
"Ashmeet",
""
],
[
"Friedrich",
"Oliver",
""
]
] | We study gravitational back-reaction within relational time formulations of quantum mechanics by considering two versions of time: a time coordinate, modelled as a global quantum degree of freedom, and the proper time of a given physical system, modelled via an internal degree of freedom serving as a local quantum "clo... |
1806.05249 | Haopeng Yan | Minyong Guo, Niels A. Obers and Haopeng Yan | Observational signature of near-extremal Kerr-like black holes in a
modified gravity theory at the Event Horizon Telescope | 16 pages, 5 figures and 1 table. Slight change in title , fixed
typos, added references. Published in PRD | Phys. Rev. D 98, 084063 (2018) | 10.1103/PhysRevD.98.084063 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the shadows cast by near-extremal Kerr-MOG black holes for different
values of the parameter in modified gravity (MOG). In particular, we consider
an isotropic emitter orbiting near such black holes and analytically compute
the positions, fluxes and redshift factors of their images. The size of the
shadow de... | [
{
"created": "Wed, 13 Jun 2018 20:14:33 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2018 14:17:47 GMT",
"version": "v2"
}
] | 2018-11-12 | [
[
"Guo",
"Minyong",
""
],
[
"Obers",
"Niels A.",
""
],
[
"Yan",
"Haopeng",
""
]
] | We study the shadows cast by near-extremal Kerr-MOG black holes for different values of the parameter in modified gravity (MOG). In particular, we consider an isotropic emitter orbiting near such black holes and analytically compute the positions, fluxes and redshift factors of their images. The size of the shadow decr... |
1312.7361 | Koray Duztas | Koray D\"uzta\c{s} | Electromagnetic field and cosmic censorship | 10 pages no figures | Gen. Relativ. Gravit. Vol. 46, 1709, 2014 | 10.1007/s10714-014-1709-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a gedanken experiment in which an extremal Kerr black hole
interacts with a test electromagnetic field. Using Teukolsky's solutions for
electromagnetic perturbations in Kerr spacetime, and the conservation laws
imposed by the energy momentum tensor of the electromagnetic field and the
Killing vectors of ... | [
{
"created": "Fri, 27 Dec 2013 22:16:06 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2014 22:13:28 GMT",
"version": "v2"
}
] | 2014-04-11 | [
[
"Düztaş",
"Koray",
""
]
] | We construct a gedanken experiment in which an extremal Kerr black hole interacts with a test electromagnetic field. Using Teukolsky's solutions for electromagnetic perturbations in Kerr spacetime, and the conservation laws imposed by the energy momentum tensor of the electromagnetic field and the Killing vectors of th... |
1711.11500 | Matt Visser | Matt Visser (Victoria University of Wellington) | Rastall gravity is equivalent to Einstein gravity | V1: 5 pages. V2: 6 pages; 5 added references, some added discussion,
no changes in physics conclusions. V3: 7 pages, 2 added references, some
added discussion, no changes in physics conclusions | Physics Letters B 782 (2018) 83--86 | 10.1016/j.physletb.2018.05.028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rastall gravity, originally developed in 1972, is currently undergoing a
significant surge in popularity. Rastall gravity purports to be a modified
theory of gravity, with a non-conserved stress-energy tensor, and an unusual
non-minimal coupling between matter and geometry, the Rastall stress-energy
satisfying nabla_... | [
{
"created": "Thu, 30 Nov 2017 16:38:55 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2017 23:42:17 GMT",
"version": "v2"
},
{
"created": "Tue, 29 May 2018 07:56:17 GMT",
"version": "v3"
}
] | 2018-05-30 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Rastall gravity, originally developed in 1972, is currently undergoing a significant surge in popularity. Rastall gravity purports to be a modified theory of gravity, with a non-conserved stress-energy tensor, and an unusual non-minimal coupling between matter and geometry, the Rastall stress-energy satisfying nabla_b ... |
1101.4628 | Banibrata Mukhopadhyay | Banibrata Mukhopadhyay | Lorentz Symmetry Violation in Neutrinos in Curved Spacetime and its
Consequences | 3 pages; to appear in the proceedings of MG12, Marcel Grossman
Meeting, Paris, France, 12-18 July 2009 | null | 10.1142/9789814374552_0249 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutrino propagating in curved spacetimes, e.g. around black holes, in
early curved universe, violates Lorentz and then CPT symmetry, at least in the
local coordinate. This occurs due to coupling of spin of the neutrino to
background spin connection which modifies the underlying dispersion relation.
This results ... | [
{
"created": "Mon, 24 Jan 2011 19:04:35 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Mukhopadhyay",
"Banibrata",
""
]
] | The neutrino propagating in curved spacetimes, e.g. around black holes, in early curved universe, violates Lorentz and then CPT symmetry, at least in the local coordinate. This occurs due to coupling of spin of the neutrino to background spin connection which modifies the underlying dispersion relation. This results in... |
2010.02135 | Andrew Kaiser | Andrew R. Kaiser and Sean T. McWilliams | Sensitivity of present and future detectors across the black-hole binary
gravitational wave spectrum | 42 pages, 16 figures, Our code, gwent, is available at
https://github.com/ark0015/gwent and on PyPI https://pypi.org/project/gwent/
Accepted by CQG 15 December 2020 | null | 10.1088/1361-6382/abd4f6 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black-holes are known to span at least 9 orders of magnitude in mass: from
the stellar-mass objects observed by the Laser Interferometer
Gravitational-Wave Observatory Scientific Collaboration and Virgo
Collaboration, to supermassive black-holes like the one observed by the Event
Horizon Telescope at the heart of M87... | [
{
"created": "Mon, 5 Oct 2020 16:29:51 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Dec 2020 14:43:19 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Kaiser",
"Andrew R.",
""
],
[
"McWilliams",
"Sean T.",
""
]
] | Black-holes are known to span at least 9 orders of magnitude in mass: from the stellar-mass objects observed by the Laser Interferometer Gravitational-Wave Observatory Scientific Collaboration and Virgo Collaboration, to supermassive black-holes like the one observed by the Event Horizon Telescope at the heart of M87. ... |
1412.8074 | Tatsuya Narikawa | Tatsuya Narikawa, Koh Ueno, Hideyuki Tagoshi, Takahiro Tanaka,
Nobuyuki Kanda, and Takashi Nakamura | Detectability of bigravity with graviton oscillations using
gravitational wave observations | 14 pages, 14 figures; v2: matches the published version in Phys. Rev.
D | Phys. Rev. D 91, 062007 (2015) | 10.1103/PhysRevD.91.062007 | OUTAP-365, KUNS-2549, YITP-15-20 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational waveforms in the ghost-free bigravity theory exhibit
deviations from those in general relativity. The main difference is caused by
graviton oscillations in the bigravity theory. We investigate the prospects for
the detection of the corrections to gravitational waveforms from coalescing
compact binar... | [
{
"created": "Sat, 27 Dec 2014 18:35:34 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2015 19:18:31 GMT",
"version": "v2"
}
] | 2015-04-02 | [
[
"Narikawa",
"Tatsuya",
""
],
[
"Ueno",
"Koh",
""
],
[
"Tagoshi",
"Hideyuki",
""
],
[
"Tanaka",
"Takahiro",
""
],
[
"Kanda",
"Nobuyuki",
""
],
[
"Nakamura",
"Takashi",
""
]
] | The gravitational waveforms in the ghost-free bigravity theory exhibit deviations from those in general relativity. The main difference is caused by graviton oscillations in the bigravity theory. We investigate the prospects for the detection of the corrections to gravitational waveforms from coalescing compact binarie... |
2002.04949 | Kirill Krasnov | Ernesto Frodden and Kirill Krasnov | Isometries from gauge transformations | 16 pages, no figures | null | 10.1088/1361-6382/ab8a5e | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In four dimensions one can use the chiral part of the spin connection as the
main object that encodes geometry. The metric is then recovered algebraically
from the curvature of this connection. We address the question of how
isometries can be identified in this "pure connection" formalism. We show that
isometries are... | [
{
"created": "Wed, 12 Feb 2020 12:32:23 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Frodden",
"Ernesto",
""
],
[
"Krasnov",
"Kirill",
""
]
] | In four dimensions one can use the chiral part of the spin connection as the main object that encodes geometry. The metric is then recovered algebraically from the curvature of this connection. We address the question of how isometries can be identified in this "pure connection" formalism. We show that isometries are r... |
0704.3429 | Carlos Kozameh | Carlos Kozameh and Florencia Parisi | Light Propagation on Quantum Curved Spacetime and Back reaction effects | null | Class.Quant.Grav.24:4475-4490,2007 | 10.1088/0264-9381/24/17/013 | null | gr-qc | null | We study the electromagnetic field equations on an arbitrary quantum curved
background in the semiclassical approximation of Loop Quantum Gravity. The
effective interaction hamiltonian for the Maxwell and gravitational fields is
obtained and the corresponding field equations, which can be expressed as a
modified wave... | [
{
"created": "Wed, 25 Apr 2007 19:27:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kozameh",
"Carlos",
""
],
[
"Parisi",
"Florencia",
""
]
] | We study the electromagnetic field equations on an arbitrary quantum curved background in the semiclassical approximation of Loop Quantum Gravity. The effective interaction hamiltonian for the Maxwell and gravitational fields is obtained and the corresponding field equations, which can be expressed as a modified wave e... |
gr-qc/9903009 | Keith Anguige | K. Anguige (Max Planck Institut fuer Gravitationsphysik, Potsdam), K.
P. Tod (Mathematical Institute, Oxford) | Isotropic cosmological singularities 2: The Einstein-Vlasov system | LaTeX, 37 pages, no figures, submitted to Ann. Phys | Annals Phys. 276 (1999) 294-320 | 10.1006/aphy.1999.5947 | null | gr-qc | null | We consider the conformal Einstein equations for massless collisionless gas
cosmologies which admit an isotropic singularity. After developing the general
theory, we restrict to spatially-homogeneous cosmologies. We show that the
Cauchy problem for these equations is well-posed with data consisting of the
limiting pa... | [
{
"created": "Tue, 2 Mar 1999 12:28:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Anguige",
"K.",
"",
"Max Planck Institut fuer Gravitationsphysik, Potsdam"
],
[
"Tod",
"K. P.",
"",
"Mathematical Institute, Oxford"
]
] | We consider the conformal Einstein equations for massless collisionless gas cosmologies which admit an isotropic singularity. After developing the general theory, we restrict to spatially-homogeneous cosmologies. We show that the Cauchy problem for these equations is well-posed with data consisting of the limiting part... |
1605.05979 | Michele Ronco | Michele Ronco | On the UV dimensions of Loop Quantum Gravity | Article ID 9897051, 7 pages. Advances in High Energy Physics (2016) | null | 10.1155/2016/9897051 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Planck-scale dynamical dimensional reduction is attracting more and more
interest in the quantum-gravity literature since it seems to be a model
independent effect. However different studies base their results on different
concepts of spacetime dimensionality. Most of them rely on the
\textit{spectral} dimension, oth... | [
{
"created": "Thu, 19 May 2016 14:45:25 GMT",
"version": "v1"
},
{
"created": "Sun, 22 May 2016 21:06:42 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Jul 2016 09:02:44 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Jul 2016 10:42:30 GMT",
"version": "v4"
}
] | 2016-07-29 | [
[
"Ronco",
"Michele",
""
]
] | Planck-scale dynamical dimensional reduction is attracting more and more interest in the quantum-gravity literature since it seems to be a model independent effect. However different studies base their results on different concepts of spacetime dimensionality. Most of them rely on the \textit{spectral} dimension, other... |
1610.06914 | Salvatore Vitale | Salvatore Vitale | Three observational differences for binary black holes detections with
second and third generation gravitational-wave detectors | Version matching paper accepted by PRD Rapid Communications | Phys. Rev. D 94, 121501 (2016) | 10.1103/PhysRevD.94.121501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Advanced gravitational-wave observatories, such as LIGO and Virgo, will
detect hundreds of gravitational waves emitted by binary black holes in the
next few years. The collection of detected sources is expected to have certain
properties. It is expected that a selection bias will exist toward higher mass
systems, tha... | [
{
"created": "Fri, 21 Oct 2016 19:53:53 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 2016 01:25:27 GMT",
"version": "v2"
}
] | 2017-03-02 | [
[
"Vitale",
"Salvatore",
""
]
] | Advanced gravitational-wave observatories, such as LIGO and Virgo, will detect hundreds of gravitational waves emitted by binary black holes in the next few years. The collection of detected sources is expected to have certain properties. It is expected that a selection bias will exist toward higher mass systems, that ... |
1004.3582 | Elias Gravanis | Elias Gravanis | Conserved charges in (Lovelock) gravity in first order formalism | 20 pages, no figures | Phys.Rev.D81:084013,2010 | 10.1103/PhysRevD.81.084013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive conserved charges as quasi-local Hamiltonians by covariant phase
space methods for a class of geometric Lagrangians that can be written in terms
of the spin connection, the vielbein and possibly other tensorial form fields,
allowing also for non-zero torsion. We then re-calculate certain known results
and d... | [
{
"created": "Tue, 20 Apr 2010 21:32:34 GMT",
"version": "v1"
}
] | 2010-05-19 | [
[
"Gravanis",
"Elias",
""
]
] | We derive conserved charges as quasi-local Hamiltonians by covariant phase space methods for a class of geometric Lagrangians that can be written in terms of the spin connection, the vielbein and possibly other tensorial form fields, allowing also for non-zero torsion. We then re-calculate certain known results and der... |
1803.10858 | Hal Haggard | Eugenio Bianchi and Hal M. Haggard | Spin fluctuations and black hole singularities: the onset of quantum
gravity is spacelike | 10 pages, 2 figures, extended to include a new derivation and more
discussion | null | 10.1088/1367-2630/aae71d | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Due to quantum fluctuations, a black hole of mass $M$ represents an average
over an ensemble of black hole geometries with angular momentum. This
observation is apparently at odds with the fact that the curvature singularity
inside a rotating black hole is timelike, while the one inside a non-rotating
black hole is s... | [
{
"created": "Wed, 28 Mar 2018 21:23:07 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jul 2018 19:25:10 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"Bianchi",
"Eugenio",
""
],
[
"Haggard",
"Hal M.",
""
]
] | Due to quantum fluctuations, a black hole of mass $M$ represents an average over an ensemble of black hole geometries with angular momentum. This observation is apparently at odds with the fact that the curvature singularity inside a rotating black hole is timelike, while the one inside a non-rotating black hole is spa... |
gr-qc/0702105 | Irina Radinschi | I. Radinschi (Gh. Asachi Technical University, Iasi, Romania) and
I-Ching Yang (Department of Natural Science Education, National Taitung
University, Taitung, Taiwan, Republic of China) | Landau-Lifshitz and Weinberg Energy-Momentum Complexes for 2+1
Dimensional Black Hole Solutions | LaTex | null | null | null | gr-qc | null | The aim of this paper is to evaluate the energy distribution of some 2+1
black hole solutions applying the Landau-Lifshitz and Weinberg definitions. The
metrics under consideration describe the charged black hole, the solution
coupling to a static scalar field and the static and circularly symmetric exact
solution of... | [
{
"created": "Mon, 19 Feb 2007 18:43:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Radinschi",
"I.",
"",
"Gh. Asachi Technical University, Iasi, Romania"
],
[
"Yang",
"I-Ching",
"",
"Department of Natural Science Education, National Taitung\n University, Taitung, Taiwan, Republic of China"
]
] | The aim of this paper is to evaluate the energy distribution of some 2+1 black hole solutions applying the Landau-Lifshitz and Weinberg definitions. The metrics under consideration describe the charged black hole, the solution coupling to a static scalar field and the static and circularly symmetric exact solution of t... |
1812.11892 | David Garfinkle | David Garfinkle | Matters of Gravity: The Newsletter of the Division of Gravitational
Physics of the American Physical Society. Number 52. December 2018 | typos corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | we hear that..., by David Garfinkle
APS April Meeting, by David Garfinkle
| [
{
"created": "Mon, 24 Dec 2018 19:19:31 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jan 2019 19:06:05 GMT",
"version": "v2"
}
] | 2019-01-04 | [
[
"Garfinkle",
"David",
""
]
] | we hear that..., by David Garfinkle APS April Meeting, by David Garfinkle |
1307.4747 | Jacek Puchta M.Sc. | Jacek Puchta | Asymptotic of Lorentzian Polyhedra Propagator | null | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A certain operator $\T=\int_{\SL}\dd g\, Y^{\dagger}gY$ can be found in
various Lorentzian EPRL calculations. The properties of this operator has been
studied here in large $j$ limit. The leading order of $\T$ is proportional to
the identity operator. Knowing the operator $\T$ one can renormalize
spin-foam's edge sel... | [
{
"created": "Wed, 17 Jul 2013 19:58:01 GMT",
"version": "v1"
}
] | 2013-07-19 | [
[
"Puchta",
"Jacek",
""
]
] | A certain operator $\T=\int_{\SL}\dd g\, Y^{\dagger}gY$ can be found in various Lorentzian EPRL calculations. The properties of this operator has been studied here in large $j$ limit. The leading order of $\T$ is proportional to the identity operator. Knowing the operator $\T$ one can renormalize spin-foam's edge self-... |
gr-qc/0510108 | Yakov Shnir | Yasha Shnir | Monopole-Monopole solutions of Einstein-Yang-Mills-Higgs Theory | 6 pages, 10 figures | null | null | null | gr-qc | null | New static regular axially symmetric solutions of SU(2) Yang-Mills-Higgs
theory are constructed. They are asymptotically flat and represent gravitating
monopole-monopole pairs. The solutions form two branches linked to the second
Bartnik-McKinnon solution on upper mass branch and to the unstable
monopole-monopole con... | [
{
"created": "Tue, 25 Oct 2005 17:23:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shnir",
"Yasha",
""
]
] | New static regular axially symmetric solutions of SU(2) Yang-Mills-Higgs theory are constructed. They are asymptotically flat and represent gravitating monopole-monopole pairs. The solutions form two branches linked to the second Bartnik-McKinnon solution on upper mass branch and to the unstable monopole-monopole confi... |
gr-qc/0002012 | Mukul Patel | Mukul Patel | Principia Physica | 14 pages, includes table of contents | null | null | null | gr-qc quant-ph | null | A comprehensive physical theory explains all aspects of the physical
universe, including quantum aspects, classical aspects, relativistic aspects,
their relationships, and unification. The central nonlocality principle leads
to a nonlocal geometry that explains entire quantum phenomenology, including
two-slit experim... | [
{
"created": "Wed, 2 Feb 2000 20:21:14 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 2000 14:29:57 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Patel",
"Mukul",
""
]
] | A comprehensive physical theory explains all aspects of the physical universe, including quantum aspects, classical aspects, relativistic aspects, their relationships, and unification. The central nonlocality principle leads to a nonlocal geometry that explains entire quantum phenomenology, including two-slit experimen... |
1008.1385 | Tomohiro Takahashi | Tomohiro Takahashi and Jiro Soda | Master Equations for Gravitational Perturbations of Static Lovelock
Black Holes in Higher Dimensions | 16 pages; v2: references added; v3: typos | Prog.Theor.Phys.124:911-924,2010 | 10.1143/PTP.124.911 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we derive the master equations for gravitational perturbations
of vector and scalar type for static vacuum Lovelock black holes. Together with
our previous work on the tensor type perturbation, we now provide the full set
of master equations that governs all types of gravitational perturbations of
stat... | [
{
"created": "Sun, 8 Aug 2010 05:45:14 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Aug 2010 00:06:53 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Feb 2011 08:53:50 GMT",
"version": "v3"
}
] | 2011-03-01 | [
[
"Takahashi",
"Tomohiro",
""
],
[
"Soda",
"Jiro",
""
]
] | In this paper, we derive the master equations for gravitational perturbations of vector and scalar type for static vacuum Lovelock black holes. Together with our previous work on the tensor type perturbation, we now provide the full set of master equations that governs all types of gravitational perturbations of static... |
gr-qc/9504016 | Giuseppe Pollifrone-.+39-6-49914350- | G. Esposito, A. Yu. Kamenshchik, I. V. Mishakov, and G. Pollifrone | One-Loop Amplitudes in Euclidean Quantum Gravity | 26 pages, plain TeX, no figures | Phys.Rev. D52 (1995) 3457-3465 | 10.1103/PhysRevD.52.3457 | Rome1-1101/95, DSF 95/16 | gr-qc hep-th | null | This paper studies the linearized gravitational field in the presence of
boundaries. For this purpose, $\zeta$-function regularization is used to
perform the mode-by-mode evaluation of BRST-invariant Faddeev-Popov amplitudes
in the case of flat Euclidean four-space bounded by a three-sphere. On choosing
the de Donder... | [
{
"created": "Wed, 12 Apr 1995 09:06:26 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Esposito",
"G.",
""
],
[
"Kamenshchik",
"A. Yu.",
""
],
[
"Mishakov",
"I. V.",
""
],
[
"Pollifrone",
"G.",
""
]
] | This paper studies the linearized gravitational field in the presence of boundaries. For this purpose, $\zeta$-function regularization is used to perform the mode-by-mode evaluation of BRST-invariant Faddeev-Popov amplitudes in the case of flat Euclidean four-space bounded by a three-sphere. On choosing the de Donder g... |
gr-qc/0506028 | Michal Demetrian | Michal Demetrian | False vacuum decay in a brane world cosmological model | minor changes done, references added, version to appear in GRG | Gen.Rel.Grav.38:953-962,2006 | 10.1007/s10714-006-0275-4 | null | gr-qc | null | The false vacuum decay in a brane world model is studied in this work. We
investigate the vacuum decay via the Coleman-de Luccia instanton, derive
explicit approximative expressions for the Coleman-de Luccia instanton which is
close to a Hawking-Moss instanton and compare the results with those already
obtained withi... | [
{
"created": "Mon, 6 Jun 2005 06:19:01 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jun 2005 07:56:09 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jan 2006 21:04:22 GMT",
"version": "v3"
}
] | 2009-08-18 | [
[
"Demetrian",
"Michal",
""
]
] | The false vacuum decay in a brane world model is studied in this work. We investigate the vacuum decay via the Coleman-de Luccia instanton, derive explicit approximative expressions for the Coleman-de Luccia instanton which is close to a Hawking-Moss instanton and compare the results with those already obtained within ... |
gr-qc/9703038 | Jose A. Zapata | Jose A. Zapata | Combinatorial space from loop quantum gravity | Revised version. To be published in General Relativity and
Gravitation, 14 pages, 1 figure | Gen.Rel.Grav. 30 (1998) 1229-1245 | 10.1023/A:1026699012787 | CGPG-97/3-8 | gr-qc hep-lat hep-th | null | The canonical quantization of diffeomorphism invariant theories of
connections in terms of loop variables is revisited. Such theories include
general relativity described in terms of Ashtekar-Barbero variables and
extension to Yang-Mills fields (with or without fermions) coupled to gravity.
It is argued that the op... | [
{
"created": "Fri, 14 Mar 1997 22:25:01 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 1998 19:09:44 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Zapata",
"Jose A.",
""
]
] | The canonical quantization of diffeomorphism invariant theories of connections in terms of loop variables is revisited. Such theories include general relativity described in terms of Ashtekar-Barbero variables and extension to Yang-Mills fields (with or without fermions) coupled to gravity. It is argued that the operat... |
1204.3710 | Hideki Asada | Koki Nakajima, Hideki Asada | Deflection angle of light in an Ellis wormhole geometry | 3 pages, accepted by PRD | Phys.Rev.D85:107501 (2012) | 10.1103/PhysRevD.85.107501 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine the light deflection by an Ellis wormhole. The bending angle as
a function of the ratio between the impact parameter and the throat radius of
the wormhole is obtained in terms of a complete elliptic integral of the first
kind. This result immediately yields asymptotic expressions in the weak field
approx... | [
{
"created": "Tue, 17 Apr 2012 06:39:32 GMT",
"version": "v1"
}
] | 2012-08-20 | [
[
"Nakajima",
"Koki",
""
],
[
"Asada",
"Hideki",
""
]
] | We reexamine the light deflection by an Ellis wormhole. The bending angle as a function of the ratio between the impact parameter and the throat radius of the wormhole is obtained in terms of a complete elliptic integral of the first kind. This result immediately yields asymptotic expressions in the weak field approxim... |
gr-qc/0311089 | Joan Josep Ferrando | Joan Josep Ferrando Juan Antonio S\'aez | Aligned electric and magnetic Weyl fields | 14 pages | Gen.Rel.Grav. 36 (2004) 2497-2510 | 10.1023/B:GERG.0000046835.03099.b1 | null | gr-qc | null | We analyze the spacetimes admitting a direction for which the relative
electric and magnetic Weyl fields are aligned. We give an invariant
characterization of these metrics and study the properties of its Debever null
vectors. The directions 'observing' aligned electric and magnetic Weyl fields
are obtained for every... | [
{
"created": "Thu, 27 Nov 2003 15:46:53 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Sáez",
"Joan Josep Ferrando Juan Antonio",
""
]
] | We analyze the spacetimes admitting a direction for which the relative electric and magnetic Weyl fields are aligned. We give an invariant characterization of these metrics and study the properties of its Debever null vectors. The directions 'observing' aligned electric and magnetic Weyl fields are obtained for every P... |
gr-qc/9802030 | Piotr Jaranowski | Piotr Jaranowski and Gerhard Schaefer | Non-uniqueness of the third post-Newtonian binary point-mass dynamics | LaTeX, 2 pages, submitted to Phys. Rev. D | Phys.Rev.D57:5948-5949,1998 | 10.1103/PhysRevD.57.5948 | null | gr-qc | null | It is shown that the recently found non-uniqueness of the third
post-Newtonian binary point-mass ADM-Hamiltonian is related to the
non-uniqueness at the third post-Newtonian approximation of the applied
ADM-coordinate conditions.
| [
{
"created": "Fri, 13 Feb 1998 19:15:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jaranowski",
"Piotr",
""
],
[
"Schaefer",
"Gerhard",
""
]
] | It is shown that the recently found non-uniqueness of the third post-Newtonian binary point-mass ADM-Hamiltonian is related to the non-uniqueness at the third post-Newtonian approximation of the applied ADM-coordinate conditions. |
2003.13583 | Dennis Stock | Dennis Stock | The Hawking Energy on the Past Lightcone in Cosmology | matches published version | Classical and Quantum Gravity, volume 37, number 21, 7 October
2020 | 10.1088/1361-6382/aba182 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work studies the Hawking energy in a cosmological context. The past
lightcone of a point in spacetime is the natural geometric structure closely
linked to cosmological observations. By slicing the past lightcone into a
1-parameter family of spacelike 2-surfaces, the evolution of the Hawking energy
down the light... | [
{
"created": "Mon, 30 Mar 2020 15:57:40 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2020 15:23:54 GMT",
"version": "v2"
}
] | 2020-10-16 | [
[
"Stock",
"Dennis",
""
]
] | This work studies the Hawking energy in a cosmological context. The past lightcone of a point in spacetime is the natural geometric structure closely linked to cosmological observations. By slicing the past lightcone into a 1-parameter family of spacelike 2-surfaces, the evolution of the Hawking energy down the lightco... |
1807.10168 | Bert Janssen | Bert Janssen and Alejandro Jimenez-Cano | Projective symmetries and induced electromagnetism in metric-affine
gravity | 6 pages, no figures. v2: Minor changes, references added. Version to
be published in Phys. Lett. B | Phys. Lett. B786 (2018) 462-465 | 10.1016/j.physletb.2018.10.032 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a framework in which the projective symmetry of the
Einstein-Hilbert action in metric-affine gravity is used to induce an effective
coupling between the Dirac lagrangian and the Maxwell field. The effective
$U(1)$ gauge potential arises as the trace of the non-metricity tensor $Q_{\mu
a}{}^a$ and couples i... | [
{
"created": "Thu, 26 Jul 2018 14:33:40 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2018 15:46:04 GMT",
"version": "v2"
}
] | 2018-11-01 | [
[
"Janssen",
"Bert",
""
],
[
"Jimenez-Cano",
"Alejandro",
""
]
] | We present a framework in which the projective symmetry of the Einstein-Hilbert action in metric-affine gravity is used to induce an effective coupling between the Dirac lagrangian and the Maxwell field. The effective $U(1)$ gauge potential arises as the trace of the non-metricity tensor $Q_{\mu a}{}^a$ and couples in ... |
1212.3103 | Hakan Cebeci | Hakan Cebeci, Nulifer Ozdemir | Dirac equation in Kerr-Taub NUT spacetime | 29 pages, 4 figures, extended discussion part, one reference added,
accepted for publication | null | 10.1088/0264-9381/30/17/175005 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Dirac equation in Kerr-Taub-NUT spacetime. We use Boyer-Lindquist
coordinates and separate the resulting equations into radial and angular parts.
We get some exact analytical solutions of the angular equations for some
special cases. We also obtain the radial wave equations with an effective
potential. Final... | [
{
"created": "Thu, 13 Dec 2012 09:58:45 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2013 13:35:09 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Cebeci",
"Hakan",
""
],
[
"Ozdemir",
"Nulifer",
""
]
] | We study Dirac equation in Kerr-Taub-NUT spacetime. We use Boyer-Lindquist coordinates and separate the resulting equations into radial and angular parts. We get some exact analytical solutions of the angular equations for some special cases. We also obtain the radial wave equations with an effective potential. Finally... |
gr-qc/0301123 | Ivan S. N. Booth | Ivan S. Booth, Stephen Fairhurst | Canonical Phase Space Formulation of Quasilocal General Relativity | 31 pages, 2 figures, references added, typos corrected, section 3
revised for clarity, to appear in Classical and Quantum Gravity | Class.Quant.Grav.20:4507-4532,2003 | 10.1088/0264-9381/20/21/001 | null | gr-qc | null | We construct a Hamiltonian formulation of quasilocal general relativity using
an extended phase space that includes boundary coordinates as configuration
variables. This allows us to use Hamiltonian methods to derive an expression
for the energy of a non-isolated region of space-time that interacts with its
neighbour... | [
{
"created": "Thu, 30 Jan 2003 16:12:36 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2003 12:47:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Booth",
"Ivan S.",
""
],
[
"Fairhurst",
"Stephen",
""
]
] | We construct a Hamiltonian formulation of quasilocal general relativity using an extended phase space that includes boundary coordinates as configuration variables. This allows us to use Hamiltonian methods to derive an expression for the energy of a non-isolated region of space-time that interacts with its neighbourho... |
gr-qc/9411044 | null | Massimo Fioroni and Giorgio Immirzi | How and why the wave function collapses after a measurement | 7 pages, latex | null | null | DFUPG 97/94 | gr-qc quant-ph | null | We explain the collapse of the wavefunction with the notion that, in a
measurement, the system observed nucleates a first order phase transition in
the measuring device. The possible final states differ by the values of
macroscopic observables, and their relative phase is therefore unobservable.
The process is irreve... | [
{
"created": "Wed, 16 Nov 1994 16:12:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fioroni",
"Massimo",
""
],
[
"Immirzi",
"Giorgio",
""
]
] | We explain the collapse of the wavefunction with the notion that, in a measurement, the system observed nucleates a first order phase transition in the measuring device. The possible final states differ by the values of macroscopic observables, and their relative phase is therefore unobservable. The process is irrevers... |
1302.5338 | Ivica Smoli\'c | Bruno Klajn and Ivica Smoli\'c | Subtleties of Invariance, Covariance and Observer Independence | 15 pages, revised, published version | Eur. J. Phys. 34 (2013) 887 | 10.1088/0143-0807/34/4/887 | TZF-13-01 | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of the observers is frequently obscured in the literature, either by
writing equations in a coordinate system implicitly pertaining to some specific
observer or by entangling the invariance and the observer dependence of
physical quantities. Using examples in relativistic kinematics and classical
electrodyna... | [
{
"created": "Wed, 20 Feb 2013 16:10:45 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2013 10:25:33 GMT",
"version": "v2"
},
{
"created": "Fri, 10 May 2013 09:13:27 GMT",
"version": "v3"
}
] | 2013-05-14 | [
[
"Klajn",
"Bruno",
""
],
[
"Smolić",
"Ivica",
""
]
] | The role of the observers is frequently obscured in the literature, either by writing equations in a coordinate system implicitly pertaining to some specific observer or by entangling the invariance and the observer dependence of physical quantities. Using examples in relativistic kinematics and classical electrodynami... |
2009.04218 | Muhammad Sharif | M. Sharif and Qanitah Ama-Tul-Mughani | Phase Transition and Thermal Fluctuations of Quintessential
Kerr-Newman-AdS Black Hole | 26 pages, 8 figures, to appear in Phys. Dark Universe | Phys. Dark Universe 30(2020)100723 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to analyzing the critical phenomenon and phase
transition of quintessential Kerr-Newman-anti-de Sitter black hole in the
framework of Maxwell equal-area law. For this purpose, we first derive
thermodynamic quantities such as Hawking temperature, entropy and angular
momentum in the context of ext... | [
{
"created": "Tue, 8 Sep 2020 13:17:11 GMT",
"version": "v1"
}
] | 2020-10-08 | [
[
"Sharif",
"M.",
""
],
[
"Ama-Tul-Mughani",
"Qanitah",
""
]
] | This paper is devoted to analyzing the critical phenomenon and phase transition of quintessential Kerr-Newman-anti-de Sitter black hole in the framework of Maxwell equal-area law. For this purpose, we first derive thermodynamic quantities such as Hawking temperature, entropy and angular momentum in the context of exten... |
1610.07280 | Taishi Ikeda | Taishi Ikeda, Chul-Moon Yoo | Critical behavior of spherically symmetric domain wall collapse | 18 pages, 11 figures | Phys. Rev. D 94, 124032 (2016) | 10.1103/PhysRevD.94.124032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Critical collapse of a spherically symmetric domain wall is investigated. The
domain wall is made of a minimally coupled scalar field with a double well
potential. We consider a sequence of the initial data which describe a
momentarily static domain wall characterized by its initial radius. The time
evolution is perf... | [
{
"created": "Mon, 24 Oct 2016 04:55:40 GMT",
"version": "v1"
}
] | 2016-12-28 | [
[
"Ikeda",
"Taishi",
""
],
[
"Yoo",
"Chul-Moon",
""
]
] | Critical collapse of a spherically symmetric domain wall is investigated. The domain wall is made of a minimally coupled scalar field with a double well potential. We consider a sequence of the initial data which describe a momentarily static domain wall characterized by its initial radius. The time evolution is perfor... |
2309.00722 | Douglas Gingrich Mr. | Douglas M. Gingrich | Quasinormal modes of loop quantum black holes near the Planck scale | addressed comments | Physical Review D 109, 044044 (2024) | 10.1103/PhysRevD.109.044044 | null | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We compare four loop quantum gravity inspired black hole metrics near the
Planck scale. Spin 0, 1/2, 1, and 2 field perturbations on these backgrounds
are studied. The axial gravitational quasinormal modes are calculated and
compared. The time evolution of the ringdown is examined. We also calculate the
quasinormal m... | [
{
"created": "Fri, 1 Sep 2023 20:14:33 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2023 05:03:22 GMT",
"version": "v2"
}
] | 2024-02-27 | [
[
"Gingrich",
"Douglas M.",
""
]
] | We compare four loop quantum gravity inspired black hole metrics near the Planck scale. Spin 0, 1/2, 1, and 2 field perturbations on these backgrounds are studied. The axial gravitational quasinormal modes are calculated and compared. The time evolution of the ringdown is examined. We also calculate the quasinormal mod... |
1104.1664 | Sergey Tegai | Sergey Ph. Tegai | On a weak solution of Einstein equations for expanding dust | 4 pages, 3 figures | null | 10.1142/9789814374552_0224 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An expanding spherically symmetric dust cloud is considered in a framework of
general relativity. Initial conditions leading to a shell-crossing singularity
are chosen. The way to construct a weak solution for such a case is proposed.
Suggested method consists in cutting off the region containing the
shell-crossing a... | [
{
"created": "Sat, 9 Apr 2011 00:42:11 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Tegai",
"Sergey Ph.",
""
]
] | An expanding spherically symmetric dust cloud is considered in a framework of general relativity. Initial conditions leading to a shell-crossing singularity are chosen. The way to construct a weak solution for such a case is proposed. Suggested method consists in cutting off the region containing the shell-crossing and... |
2104.10253 | V Gayathri | V. Gayathri, Y. Yang, H. Tagawa, Z. Haiman, I. Bartos | Black hole mergers of AGN origin in LIGO/Virgo's O1-O3a observing
periods | 9 pages, 2 figures | null | 10.3847/2041-8213/ac2cc1 | LIGO Document P2100114 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The origin of the black hole mergers detected by LIGO and Virgo remains an
open question. While the unusual mass and spin of a few events constrain their
possible astrophysical formation mechanisms, it is difficult to classify the
bulk of the observed mergers. Here we consider the distribution of masses and
spins in ... | [
{
"created": "Tue, 20 Apr 2021 21:36:16 GMT",
"version": "v1"
}
] | 2021-10-27 | [
[
"Gayathri",
"V.",
""
],
[
"Yang",
"Y.",
""
],
[
"Tagawa",
"H.",
""
],
[
"Haiman",
"Z.",
""
],
[
"Bartos",
"I.",
""
]
] | The origin of the black hole mergers detected by LIGO and Virgo remains an open question. While the unusual mass and spin of a few events constrain their possible astrophysical formation mechanisms, it is difficult to classify the bulk of the observed mergers. Here we consider the distribution of masses and spins in LI... |
gr-qc/0109028 | Alan D. Rendall | Alan D. Rendall | Applications of the theory of evolution equations to general relativity | Written version of plenary talk at GR16, Durban | null | 10.1142/9789812776556_0014 | AEI-2001-112 | gr-qc | null | The theory of evolution equations has been applied in various ways in general
relativity. Following some general considerations about this, some illustrative
examples of the use of ordinary differential equations in general relativity
are presented. After this recent applications of Fuchsian equations are
described, ... | [
{
"created": "Fri, 7 Sep 2001 14:40:28 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Rendall",
"Alan D.",
""
]
] | The theory of evolution equations has been applied in various ways in general relativity. Following some general considerations about this, some illustrative examples of the use of ordinary differential equations in general relativity are presented. After this recent applications of Fuchsian equations are described, wi... |
1602.08271 | Edward Wilson-Ewing | Daniele Oriti, Lorenzo Sindoni, Edward Wilson-Ewing | Bouncing cosmologies from quantum gravity condensates | 5 pages, v2: Typos corrected, v3: Clarifications added | Class.Quant.Grav.34(2017)04LT01 | 10.1088/1361-6382/aa549a | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how the large-scale cosmological dynamics can be obtained from the
hydrodynamics of isotropic group field theory condensate states in the
Gross-Pitaevskii approximation. The correct Friedmann equations are recovered
in the semi-classical limit for some choices of the parameters in the action
for the group fie... | [
{
"created": "Fri, 26 Feb 2016 10:40:22 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2016 14:25:05 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Jan 2017 16:40:49 GMT",
"version": "v3"
}
] | 2017-01-25 | [
[
"Oriti",
"Daniele",
""
],
[
"Sindoni",
"Lorenzo",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | We show how the large-scale cosmological dynamics can be obtained from the hydrodynamics of isotropic group field theory condensate states in the Gross-Pitaevskii approximation. The correct Friedmann equations are recovered in the semi-classical limit for some choices of the parameters in the action for the group field... |
gr-qc/9608063 | Anzhong Wang | Anzhong Wang and Henrique P. de Oliveira | Critical phenomena of collapsing massless scalar wave packets | Latex file, including 2 figures, avalaible upon request | Phys.Rev.D56:753-761,1997 | 10.1103/PhysRevD.56.753 | null | gr-qc | null | An analytical model that represents the collapse of a massless scalar wave
packet with continuous self-similarity is constructed, and critical phenomena
are found. In the supercritical case, the mass of black holes is finite and has
the form $M \propto (p - p^{*})^{\gamma}$, with $\gamma = 1/2$.
| [
{
"created": "Mon, 26 Aug 1996 20:36:18 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Aug 1996 16:02:14 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Wang",
"Anzhong",
""
],
[
"de Oliveira",
"Henrique P.",
""
]
] | An analytical model that represents the collapse of a massless scalar wave packet with continuous self-similarity is constructed, and critical phenomena are found. In the supercritical case, the mass of black holes is finite and has the form $M \propto (p - p^{*})^{\gamma}$, with $\gamma = 1/2$. |
gr-qc/0006011 | Rodolfo Mohamed Id Betan | Roberto Aquilano, Mario Castagnino and Ernesto Eiroa | Addemdum to: ''The Mathematical Structure of Quantum Superspace as a
Consequence of Time Asymmetry'' | null | Phys.Rev. D59 (1999) 087301 | 10.1103/PhysRevD.59.087301 | null | gr-qc | null | In this paper we improve the results of sec. VI of paper [M. Castagnino,
Phys. Rev. D 57, 750 (1998)] by considering that the main source of entropy
production are the photospheres of the stars.
| [
{
"created": "Sat, 3 Jun 2000 14:28:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Aquilano",
"Roberto",
""
],
[
"Castagnino",
"Mario",
""
],
[
"Eiroa",
"Ernesto",
""
]
] | In this paper we improve the results of sec. VI of paper [M. Castagnino, Phys. Rev. D 57, 750 (1998)] by considering that the main source of entropy production are the photospheres of the stars. |
0705.4668 | Atsushi Nishizawa | Atsushi Nishizawa, Seiji Kawamura and Masa-aki Sakagami | Quantum Noise in Differential-type Gravitational-wave Interferometer and
Signal Recycling | 17 pages, submitted to Phys.Rev.D | Phys.Rev.D76:042002,2007 | 10.1103/PhysRevD.76.042002 | null | gr-qc | null | There exists the standard quantum limit (SQL), derived from Heisenberg's
uncertainty relation, in the sensitivity of laser interferometer
gravitational-wave detectors. However, in the context of a full
quantum-mechanical approach, SQL can be overcome using the correlation of shot
noise and radiation-pressure noise. S... | [
{
"created": "Thu, 31 May 2007 18:06:30 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jun 2007 05:59:52 GMT",
"version": "v2"
},
{
"created": "Sun, 3 Jun 2007 11:53:26 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Nishizawa",
"Atsushi",
""
],
[
"Kawamura",
"Seiji",
""
],
[
"Sakagami",
"Masa-aki",
""
]
] | There exists the standard quantum limit (SQL), derived from Heisenberg's uncertainty relation, in the sensitivity of laser interferometer gravitational-wave detectors. However, in the context of a full quantum-mechanical approach, SQL can be overcome using the correlation of shot noise and radiation-pressure noise. So ... |
1510.02280 | Iver Brevik | Iver Brevik | Temperature Variation in the Dark Cosmic Fluid in the Late Universe | 16 pages latex, no figures, to appear in Mod. Phys. Lett. A. Note:
this file was previously posted incorrectly as arXiv:1509.06995v2 | Mod. Phys. Lett. A, Vol. 31, No. 8 (2016) | 10.1142/S0217732316500504 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A one-component dark energy fluid model of the late universe is considered
($w<-1$) when the fluid, initially assumed laminar, makes a transition into a
turbulent state of motion. Spatial isotropy is assumed so that only the bulk
viscosities are included ($\zeta$ in the laminar epoch and $\zeta_{\rm turb}$
in the tur... | [
{
"created": "Thu, 8 Oct 2015 11:15:51 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2016 15:11:02 GMT",
"version": "v2"
}
] | 2016-03-02 | [
[
"Brevik",
"Iver",
""
]
] | A one-component dark energy fluid model of the late universe is considered ($w<-1$) when the fluid, initially assumed laminar, makes a transition into a turbulent state of motion. Spatial isotropy is assumed so that only the bulk viscosities are included ($\zeta$ in the laminar epoch and $\zeta_{\rm turb}$ in the turbu... |
2304.12255 | Renan Magalh\~aes | Renan B. Magalh\~aes, Luiz C. S. Leite, Lu\'is C. B. Crispino | Parametrized black holes: Scattering investigation | 6 pages, 7 figures | Eur. Phys. J. C 82, 698 (2022) | 10.1140/epjc/s10052-022-10612-6 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the scattering of light-like geodesics and massless scalar waves by
a static Konoplya-Zhidenko black hole, considering the case that the
parametrized black hole solution contains a single deformation parameter. By
performing a geodesic analysis, we compute the classical differential
scattering cross section ... | [
{
"created": "Mon, 24 Apr 2023 16:47:12 GMT",
"version": "v1"
}
] | 2023-04-25 | [
[
"Magalhães",
"Renan B.",
""
],
[
"Leite",
"Luiz C. S.",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | We study the scattering of light-like geodesics and massless scalar waves by a static Konoplya-Zhidenko black hole, considering the case that the parametrized black hole solution contains a single deformation parameter. By performing a geodesic analysis, we compute the classical differential scattering cross section an... |
2311.10166 | Geeth Chandra Ongole | Geeth Ongole, Parampreet Singh, Anzhong Wang | Revisiting quantum black holes from effective loop quantum gravity | pdfLatex, 14 pages, 6 figures | Phys. Rev. D 109, 026015 (2024) | 10.1103/PhysRevD.109.026015 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We systematically study a family of loop quantizations for the classical
Kruskal spacetimes using the effective description motivated from loop quantum
gravity for four generic parameters, $c_o, m, \delta_b$, and $\delta_c$, where
the latter two denote the polymerization parameters that capture the underlying
quantum... | [
{
"created": "Thu, 16 Nov 2023 19:48:34 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2024 04:09:59 GMT",
"version": "v2"
}
] | 2024-06-10 | [
[
"Ongole",
"Geeth",
""
],
[
"Singh",
"Parampreet",
""
],
[
"Wang",
"Anzhong",
""
]
] | We systematically study a family of loop quantizations for the classical Kruskal spacetimes using the effective description motivated from loop quantum gravity for four generic parameters, $c_o, m, \delta_b$, and $\delta_c$, where the latter two denote the polymerization parameters that capture the underlying quantum g... |
2110.01457 | Erik Amorim | Erik Amorim, Parker Hund | General Relativistic Non-Neutral White Dwarf Stars | 10 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We generalize the recent Newtonian two-component charged fluid models for
white dwarf stars of Krivoruchenko, Nadyozhin and Yudin and of Hund and
Kiessling to the context of general relativity. We compare the equations and
numerical solutions of these models. We extend to the general relativistic
setting the non-neut... | [
{
"created": "Mon, 4 Oct 2021 13:53:46 GMT",
"version": "v1"
}
] | 2021-10-05 | [
[
"Amorim",
"Erik",
""
],
[
"Hund",
"Parker",
""
]
] | We generalize the recent Newtonian two-component charged fluid models for white dwarf stars of Krivoruchenko, Nadyozhin and Yudin and of Hund and Kiessling to the context of general relativity. We compare the equations and numerical solutions of these models. We extend to the general relativistic setting the non-neutra... |
gr-qc/0506023 | Yuan-Zhong Zhang | K.K. Nandi, Y.-Z. Zhang, A. Bhadra and P. Mitra | Scalar Field Entropy in Brane World Black Holes | 7 pages | Int.J.Mod.Phys.A21:2519-2526,2006 | 10.1142/S0217751X06031004 | null | gr-qc | null | A semiclassical calculation of entropy of a scalar field in the background of
a class of brane world black holes (BWBH) is carried out in the presence of a
brick wall cutoff when the 5D-bulk induced \textquotedblleft tidal charge" has
generic or extreme values.
| [
{
"created": "Sun, 5 Jun 2005 10:47:46 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nandi",
"K. K.",
""
],
[
"Zhang",
"Y. -Z.",
""
],
[
"Bhadra",
"A.",
""
],
[
"Mitra",
"P.",
""
]
] | A semiclassical calculation of entropy of a scalar field in the background of a class of brane world black holes (BWBH) is carried out in the presence of a brick wall cutoff when the 5D-bulk induced \textquotedblleft tidal charge" has generic or extreme values. |
gr-qc/9812073 | Sergei N. Vergeles | S.N. Vergeles (The Landau Institute for Theoretical Physics, Russian
Academy of Sciences.) | The Quantization of Gravity. Dynamic Approach | LaTeX, 19 pages, no figures | J.Exp.Theor.Phys. 83 (1996) 859-867; Zh.Eksp.Teor.Fiz. 110 (1996)
1557-1574 | null | null | gr-qc | null | On the basis of dynamic quantization method we build in this paper a new
mathematically correct quantization scheme of gravity.
In the frame of this scheme we develop a canonical formalism in
tetrad-connection variables in 4-D theory of pure gravity.
In this formalism the regularized quantized fields correspondin... | [
{
"created": "Mon, 21 Dec 1998 09:22:02 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Vergeles",
"S. N.",
"",
"The Landau Institute for Theoretical Physics, Russian\n Academy of Sciences."
]
] | On the basis of dynamic quantization method we build in this paper a new mathematically correct quantization scheme of gravity. In the frame of this scheme we develop a canonical formalism in tetrad-connection variables in 4-D theory of pure gravity. In this formalism the regularized quantized fields corresponding to t... |
2107.06306 | Michele Grasso | Michele Grasso and Eleonora Villa | BiGONLight: light propagation with bi-local operators in Numerical
Relativity | 32 pages, 5 figures, 1 table | null | 10.1088/1361-6382/ac35aa | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | BiGONLight, Bi-local Geodesic Operators framework for Numerical Light
propagation, is a new tool for light propagation in Numerical Relativity. The
package implements the Bi-local Geodesic Operators formalism, a new framework
for light propagation in General Relativity. With BiGONLight it is possible to
extract obser... | [
{
"created": "Tue, 13 Jul 2021 18:04:12 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Grasso",
"Michele",
""
],
[
"Villa",
"Eleonora",
""
]
] | BiGONLight, Bi-local Geodesic Operators framework for Numerical Light propagation, is a new tool for light propagation in Numerical Relativity. The package implements the Bi-local Geodesic Operators formalism, a new framework for light propagation in General Relativity. With BiGONLight it is possible to extract observa... |
2012.08316 | Hooman Moradpour | H. Moradpour, A. H. Ziaie, C. Corda | Tsallis uncertainty | Accepted version by EPL | null | 10.1209/0295-5075/134/20003 | 134, 20003 (2021) | gr-qc | http://creativecommons.org/licenses/by/4.0/ | It has been recently shown that the Bekenstein entropy bound is not respected
by the systems satisfying modified forms of Heisenberg uncertainty principle
(HUP) including the generalized and extended uncertainty principles, or even
their combinations. On the other, the use of generalized entropies, which
differ from ... | [
{
"created": "Sun, 13 Dec 2020 06:05:13 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Apr 2021 05:23:50 GMT",
"version": "v2"
}
] | 2021-08-11 | [
[
"Moradpour",
"H.",
""
],
[
"Ziaie",
"A. H.",
""
],
[
"Corda",
"C.",
""
]
] | It has been recently shown that the Bekenstein entropy bound is not respected by the systems satisfying modified forms of Heisenberg uncertainty principle (HUP) including the generalized and extended uncertainty principles, or even their combinations. On the other, the use of generalized entropies, which differ from Be... |
1701.07462 | Behrooz Malakolkalami | A. Mahmoodzadeh and B. Malekolkalami | Quartic time-dependent oscillatons | 17 pages 13 figures. arXiv admin note: text overlap with
arXiv:gr-qc/0104093 by other authors | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will study some properties of oscillaton, spherically
symmetric object made of a real time-dependent scalar field, Using a self-
interaction quartic scalar potential instead of a quadratic or exponential ones
discussed in previous works. Since the oscillatons can be regarded as models
for astrophysi... | [
{
"created": "Wed, 25 Jan 2017 19:52:08 GMT",
"version": "v1"
}
] | 2017-01-27 | [
[
"Mahmoodzadeh",
"A.",
""
],
[
"Malekolkalami",
"B.",
""
]
] | In this paper, we will study some properties of oscillaton, spherically symmetric object made of a real time-dependent scalar field, Using a self- interaction quartic scalar potential instead of a quadratic or exponential ones discussed in previous works. Since the oscillatons can be regarded as models for astrophysica... |
1307.0521 | Alvaro de la Cruz-Dombriz | J. A. R. Cembranos (Madrid U.), A. de la Cruz Dombriz (ICE-IEEC
Barcelona U., ACGC and Cape Town U.) and L. Olano Garcia (Madrid U.) | Complete density perturbations in the Jordan-Fierz-Brans-Dicke theory | 15 pages, 6 figures, 1 appendix | Phys. Rev. D 88, 123507 (2013) | 10.1103/PhysRevD.88.123507 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of scalar-tensor theories we study the evolution of the
density contrast for Jordan-Fierz-Brans-Dicke theories in a
Friedmann-Lemaitre-Robertson-Walker Universe. Calculations are performed in the
Einstein Frame with the cosmological background described as Lambda-Cold Dark
Matter (Lambda-CDM) and suppl... | [
{
"created": "Mon, 1 Jul 2013 20:27:36 GMT",
"version": "v1"
}
] | 2013-12-16 | [
[
"Cembranos",
"J. A. R.",
"",
"Madrid U."
],
[
"Dombriz",
"A. de la Cruz",
"",
"ICE-IEEC\n Barcelona U., ACGC and Cape Town U."
],
[
"Garcia",
"L. Olano",
"",
"Madrid U."
]
] | In the context of scalar-tensor theories we study the evolution of the density contrast for Jordan-Fierz-Brans-Dicke theories in a Friedmann-Lemaitre-Robertson-Walker Universe. Calculations are performed in the Einstein Frame with the cosmological background described as Lambda-Cold Dark Matter (Lambda-CDM) and supplem... |
2212.03021 | Shangyu Wen | Shangyu Wen, Wei Hong and Jun Tao | Observational Appearances of Magnetically Charged Black Holes in
Born-Infeld Electrodynamics | 37 pages, 18 figures, 5 tables. v3: EPJC publication version | Eur. Phys. J. C 83, 277 (2023) | 10.1140/epjc/s10052-023-11431-z | CTP-SCU/2022015 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the observational appearances of magnetically
charged black holes in Born-Infeld (BI) electrodynamics. We examine the effects
of the magnetic charge and the BI parameter on the geodesics with different
impact parameters. Using the backward ray tracing method, we investigate how
spherical... | [
{
"created": "Tue, 6 Dec 2022 14:48:50 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2022 13:44:38 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Apr 2023 03:01:45 GMT",
"version": "v3"
}
] | 2023-04-20 | [
[
"Wen",
"Shangyu",
""
],
[
"Hong",
"Wei",
""
],
[
"Tao",
"Jun",
""
]
] | In this paper, we investigate the observational appearances of magnetically charged black holes in Born-Infeld (BI) electrodynamics. We examine the effects of the magnetic charge and the BI parameter on the geodesics with different impact parameters. Using the backward ray tracing method, we investigate how spherically... |
1209.4758 | Stefano Ansoldi | Stefano Ansoldi and Eduardo I. Guendelman | Unified Dark Energy-Dark Matter model with Inverse Quintessence | 13 pages; minor changes with references added | null | 10.1088/1475-7516/2013/05/036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a model where both dark energy and dark matter originate from the
coupling of a scalar field with a non-conventional kinetic term to, both, a
metric measure and a non-metric measure. An interacting dark energy/dark matter
scenario can be obtained by introducing an additional scalar that can produce
non co... | [
{
"created": "Fri, 21 Sep 2012 09:33:16 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jan 2013 10:31:11 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Ansoldi",
"Stefano",
""
],
[
"Guendelman",
"Eduardo I.",
""
]
] | We consider a model where both dark energy and dark matter originate from the coupling of a scalar field with a non-conventional kinetic term to, both, a metric measure and a non-metric measure. An interacting dark energy/dark matter scenario can be obtained by introducing an additional scalar that can produce non cons... |
1308.5210 | Grasiele Batista Dos Santos | Cl\'ecio R. Bom, Nelson Pinto-Neto and Grasiele B. Santos | Consistent Probabilities in Perfect Fluid Quantum Universes | 11 pages, 4 figures | Phys. Rev. D 89, 023514 (2014) | 10.1103/PhysRevD.89.023514 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently it has been claimed that the Wheeler-DeWitt quantization of gravity
is unable to avoid cosmological singularities. However, in order to make this
assertion, one must specify the underlying interpretation of quantum mechanics
which has been adopted. For instance, several nonsingular models were obtained
in Wh... | [
{
"created": "Fri, 23 Aug 2013 18:57:39 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Aug 2013 11:42:53 GMT",
"version": "v2"
}
] | 2014-01-23 | [
[
"Bom",
"Clécio R.",
""
],
[
"Pinto-Neto",
"Nelson",
""
],
[
"Santos",
"Grasiele B.",
""
]
] | Recently it has been claimed that the Wheeler-DeWitt quantization of gravity is unable to avoid cosmological singularities. However, in order to make this assertion, one must specify the underlying interpretation of quantum mechanics which has been adopted. For instance, several nonsingular models were obtained in Whee... |
1407.7069 | Abdallah Al Zahrani M. | A. M. Al Zahrani | Escape of Charged Particles Moving around a Weakly Magnetized Kerr Black
Hole | A slightly modified version has been accepted as a Physical Review D
article | null | 10.1103/PhysRevD.90.044012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics and escape of charged particles initially orbiting a
weakly magnetized Kerr black hole after they get kicked in the direction normal
to the orbit. The case of neutral particles is analysed first and the escape
conditions are given analytically. A general analysis of charged particles
innermost s... | [
{
"created": "Fri, 25 Jul 2014 21:46:28 GMT",
"version": "v1"
}
] | 2014-10-17 | [
[
"Zahrani",
"A. M. Al",
""
]
] | We study the dynamics and escape of charged particles initially orbiting a weakly magnetized Kerr black hole after they get kicked in the direction normal to the orbit. The case of neutral particles is analysed first and the escape conditions are given analytically. A general analysis of charged particles innermost sta... |
gr-qc/0004027 | Ehab Malkawi | M.B. Altaie and Ehab Malkawi | Boson Condensation in an Einstein Universe | 14 pages, standard Latex, 1 figure | null | null | null | gr-qc | null | In this paper we investigate the Bose-Einstein condensation of massive spin-1
particles in an Einstein universe. The system is considered under relativistic
conditions taking into consideration the possibility of particle-antiparticle
pair production. An exact expression for the charge density is obtained, then
certa... | [
{
"created": "Sun, 9 Apr 2000 17:55:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Altaie",
"M. B.",
""
],
[
"Malkawi",
"Ehab",
""
]
] | In this paper we investigate the Bose-Einstein condensation of massive spin-1 particles in an Einstein universe. The system is considered under relativistic conditions taking into consideration the possibility of particle-antiparticle pair production. An exact expression for the charge density is obtained, then certain... |
2303.01301 | Joel Jos\'e Vel\'asquez Celis | Joel Vel\'asquez (1), H\'ector J. Hortua (2,3), Leonardo Casta\~neda
(1) ((1) Grupo de Gravitaci\'on y Cosmolog\'ia, Observatorio Astron\'omico
Nacional, Universidad Nacional de Colombia, (2) Grupo Signos, Departamento de
Matem\'aticas, Universidad el Bosque, Bogot\'a, Colombia, (3) Maestr\'ia en
Ciencia de Dat... | About Jordan and Einstein frames: a study in inflationary magnetogenesis | 23 pages, 15 figures. New references added. Typos are corrected | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | There has been considerable interest in the community to understand if the
Einstein and Jordan frames are either physically equivalent to each other or if
there exists a preference frame where interpretations of physical observables
should be done. In this paper, we want to broaden the discussion about this
equivalen... | [
{
"created": "Thu, 2 Mar 2023 14:27:14 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2023 00:40:45 GMT",
"version": "v2"
}
] | 2023-07-06 | [
[
"Velásquez",
"Joel",
""
],
[
"Hortua",
"Héctor J.",
""
],
[
"Castañeda",
"Leonardo",
""
]
] | There has been considerable interest in the community to understand if the Einstein and Jordan frames are either physically equivalent to each other or if there exists a preference frame where interpretations of physical observables should be done. In this paper, we want to broaden the discussion about this equivalence... |
0706.1416 | Michael Heller | Michael Heller, Zdzislaw Odrzygozdz, Leszek Pysiak, Wieslaw Sasin | Anatomy of Malicious Singularities | 16 pages in LaTex | null | 10.1063/1.2779955 | null | gr-qc | null | As well known, the b-boundaries of the closed Friedman world model and of
Schwarzschild solution consist of a single point. We study this phenomenon in a
broader context of differential and structured spaces. We show that it is an
equivalence relation $\rho $, defined on the Cauchy completed total space
$\bar{E}$ of ... | [
{
"created": "Mon, 11 Jun 2007 08:42:36 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Heller",
"Michael",
""
],
[
"Odrzygozdz",
"Zdzislaw",
""
],
[
"Pysiak",
"Leszek",
""
],
[
"Sasin",
"Wieslaw",
""
]
] | As well known, the b-boundaries of the closed Friedman world model and of Schwarzschild solution consist of a single point. We study this phenomenon in a broader context of differential and structured spaces. We show that it is an equivalence relation $\rho $, defined on the Cauchy completed total space $\bar{E}$ of th... |
1511.08909 | Iwo Bialynicki-Birula | Iwo Bialynicki-Birula and Zofia Bialynicka-Birula | Gravitational waves carrying orbital angular momentum | null | null | 10.1088/1367-2630/18/2/023022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spinorial formalism is used to map every electromagnetic wave into the
gravitational wave (within the linearized gravity). In this way we can obtain
the gravitational counterparts of Bessel, Laguerre-Gauss, and other light beams
carrying orbital angular momentum.
| [
{
"created": "Sat, 28 Nov 2015 16:30:08 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Bialynicki-Birula",
"Iwo",
""
],
[
"Bialynicka-Birula",
"Zofia",
""
]
] | Spinorial formalism is used to map every electromagnetic wave into the gravitational wave (within the linearized gravity). In this way we can obtain the gravitational counterparts of Bessel, Laguerre-Gauss, and other light beams carrying orbital angular momentum. |
gr-qc/0404103 | Kirill A. Kazakov | Kirill A. Kazakov | Long-Range Behavior in Quantum Gravity | A chapter contributed to ``Progress in General Relativity and Quantum
Cosmology Research'' (Nova Science Publishers), 33 pages | null | null | null | gr-qc | null | Quantum gravity effects of zeroth order in the Planck constant are
investigated in the framework of the low-energy effective theory. A special
emphasis is placed on establishing the correspondence between classical and
quantum theories, for which purpose transformation properties of the
\hbar^0-order radiative contri... | [
{
"created": "Sun, 25 Apr 2004 08:07:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kazakov",
"Kirill A.",
""
]
] | Quantum gravity effects of zeroth order in the Planck constant are investigated in the framework of the low-energy effective theory. A special emphasis is placed on establishing the correspondence between classical and quantum theories, for which purpose transformation properties of the \hbar^0-order radiative contribu... |
1511.05963 | Rodolfo Panerai | Rodolfo Panerai | Global equilibrium and local thermodynamics in stationary spacetimes | 9 pages; v2: minor changes, published version; v3: reintroduced a
paragraph from v1 | Phys. Rev. D 93, 104021 (2016) | 10.1103/PhysRevD.93.104021 | QMUL-PH-15-20 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In stationary spacetimes global equilibrium states can be defined, applying
the maximum entropy principle, by the introduction of local thermodynamic
fields determined solely by geometry. As an example, we study a class of
equilibrium states for a scalar field in Einstein's static universe,
characterized by inhomogen... | [
{
"created": "Wed, 18 Nov 2015 21:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 11 May 2016 18:50:32 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Dec 2018 16:27:16 GMT",
"version": "v3"
}
] | 2018-12-27 | [
[
"Panerai",
"Rodolfo",
""
]
] | In stationary spacetimes global equilibrium states can be defined, applying the maximum entropy principle, by the introduction of local thermodynamic fields determined solely by geometry. As an example, we study a class of equilibrium states for a scalar field in Einstein's static universe, characterized by inhomogeneo... |
1812.02675 | Yun-Cherng Lin | Yun-Cherng Lin, Michael P. Hobson, Anthony N. Lasenby | Ghost and tachyon free Poincar\'e gauge theories: a systematic approach | 16 pages, 2 figures | Phys. Rev. D 99, 064001 (2019) | 10.1103/PhysRevD.99.064001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A systematic method is presented for determining the conditions on the
parameters in the action of a parity-preserving gauge theory of gravity for it
to contain no ghost or tachyon particles. The technique naturally accommodates
critical cases in which the parameter values lead to additional gauge
invariances. The me... | [
{
"created": "Thu, 6 Dec 2018 17:18:28 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2019 14:19:36 GMT",
"version": "v2"
}
] | 2019-04-19 | [
[
"Lin",
"Yun-Cherng",
""
],
[
"Hobson",
"Michael P.",
""
],
[
"Lasenby",
"Anthony N.",
""
]
] | A systematic method is presented for determining the conditions on the parameters in the action of a parity-preserving gauge theory of gravity for it to contain no ghost or tachyon particles. The technique naturally accommodates critical cases in which the parameter values lead to additional gauge invariances. The meth... |
1308.3369 | Dirk Puetzfeld | Dirk Puetzfeld, Yuri N. Obukhov | Equations of motion in gravity theories with nonminimal coupling: a
loophole to detect torsion macroscopically? | 9 pages, RevTex format | Phys. Rev. D 88 (2013) 064025 | 10.1103/PhysRevD.88.064025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive multipolar equations of motion for gravitational theories with
general nonminimal coupling in spacetimes admitting torsion. Our very general
findings allow for the systematic testing of whole classes of theories by means
of extended test bodies. One peculiar feature of certain subclasses of
nonminimal theor... | [
{
"created": "Thu, 15 Aug 2013 12:06:59 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2013 08:20:55 GMT",
"version": "v2"
}
] | 2014-10-22 | [
[
"Puetzfeld",
"Dirk",
""
],
[
"Obukhov",
"Yuri N.",
""
]
] | We derive multipolar equations of motion for gravitational theories with general nonminimal coupling in spacetimes admitting torsion. Our very general findings allow for the systematic testing of whole classes of theories by means of extended test bodies. One peculiar feature of certain subclasses of nonminimal theorie... |
1910.08471 | Morgan Le Delliou | M. Le Delliou, E. Huguet, and M. Fontanini | Teleparallel theory as a gauge theory of translations: comments and
issues | 5pp, RevTeX4.1 | Phys. Rev. D 101, 024059 (2020) | 10.1103/PhysRevD.101.024059 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Teleparallel Equivalent to General Relativity (TEGR) is often presented
as a gauge theory of translations, i.e., that uses \emph{only} the translation
group $T_4 = (\setR^4, +)$ as its gauge group. In a previous work we argued
against this \emph{translation-only} formalism on the basis of its mathematical
shortco... | [
{
"created": "Fri, 18 Oct 2019 15:29:02 GMT",
"version": "v1"
}
] | 2020-02-05 | [
[
"Delliou",
"M. Le",
""
],
[
"Huguet",
"E.",
""
],
[
"Fontanini",
"M.",
""
]
] | The Teleparallel Equivalent to General Relativity (TEGR) is often presented as a gauge theory of translations, i.e., that uses \emph{only} the translation group $T_4 = (\setR^4, +)$ as its gauge group. In a previous work we argued against this \emph{translation-only} formalism on the basis of its mathematical shortcomi... |
1811.06142 | Bo Wang | Bo Wang, Yang Zhang | Second-order cosmological perturbations. III. Produced by scalar-scalar
coupling during radiation-dominated stage | 75 pages, 1 figure. We make the discussion below Eq.(6.8) clearer in
this updated version | Phys. Rev. D 98, 123019 (2018) | 10.1103/PhysRevD.98.123019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the 2nd-order scalar, vector and tensor metric perturbations in
Robertson-Walker (RW) spacetime in synchronous coordinates during the radiation
dominated (RD) stage. The dominant radiation is modeled by a relativistic fluid
described by a stress tensor $T_{\mu\nu}=(\rho+p)U_\mu U_\nu+g_{\mu\nu}p$ with
$p= c^... | [
{
"created": "Thu, 15 Nov 2018 02:19:46 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2018 10:23:05 GMT",
"version": "v2"
},
{
"created": "Sun, 3 Feb 2019 15:04:49 GMT",
"version": "v3"
}
] | 2019-02-05 | [
[
"Wang",
"Bo",
""
],
[
"Zhang",
"Yang",
""
]
] | We study the 2nd-order scalar, vector and tensor metric perturbations in Robertson-Walker (RW) spacetime in synchronous coordinates during the radiation dominated (RD) stage. The dominant radiation is modeled by a relativistic fluid described by a stress tensor $T_{\mu\nu}=(\rho+p)U_\mu U_\nu+g_{\mu\nu}p$ with $p= c^2_... |
gr-qc/0201003 | Masaru Siino | Masaru Siino (Tokyo Inst. of Technology) | Topological derivation of Black Hole entropy by analogy with a chain
polymer | Some misleading sentences are corrected. Accepted for publication in
Phys. Rev. D | Phys.Rev. D66 (2002) 104006 | 10.1103/PhysRevD.66.104006 | null | gr-qc | null | The generic crease set of an event horizon possesses anisotropic structure
though most of black holes are dynamically stable. This fact suggests that a
generic almost spherical black hole has a very crumpled crease set in a
microscopic scale though the crease set is similar to a point-wise crease set
in a macroscopic... | [
{
"created": "Mon, 31 Dec 2001 23:58:10 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2002 11:11:26 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Siino",
"Masaru",
"",
"Tokyo Inst. of Technology"
]
] | The generic crease set of an event horizon possesses anisotropic structure though most of black holes are dynamically stable. This fact suggests that a generic almost spherical black hole has a very crumpled crease set in a microscopic scale though the crease set is similar to a point-wise crease set in a macroscopic s... |
2206.14953 | Yun Soo Myung | Yun Soo Myung | Superradiant instability of a massive scalar on the Kerr spacetime | 21 pages, 14 figures. arXiv admin note: text overlap with
arXiv:2204.04789 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the superradiant instability of Kerr black holes under a
massive scalar perturbation. We obtain a potential $V_i(r)$ when expanding the
scalar potential $V_K(r)$ for large $r$. The Newton potential $V_1(r)$ and the
far-region potential $V_2(r)$ are used to explore the superradiant instability,
while $V... | [
{
"created": "Thu, 30 Jun 2022 00:01:56 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jul 2022 22:03:48 GMT",
"version": "v2"
}
] | 2022-07-05 | [
[
"Myung",
"Yun Soo",
""
]
] | We investigate the superradiant instability of Kerr black holes under a massive scalar perturbation. We obtain a potential $V_i(r)$ when expanding the scalar potential $V_K(r)$ for large $r$. The Newton potential $V_1(r)$ and the far-region potential $V_2(r)$ are used to explore the superradiant instability, while $V_3... |
2401.13746 | Shibendu Gupta Choudhury | Shibendu Gupta Choudhury, Sagar Kumar Maity and Amitabha Lahiri | Torsional four-fermion interaction and the Raychaudhuri equation | 30 pages, 1 figure; comments and suggestions are welcome | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Intrinsic spin of fermions can generate torsion in spacetime. This torsion is
a non-propagating field that can be integrated out, leaving an effective
non-universal four-fermion interaction. This geometrical interaction affects
fermions inside a matter distribution and can be expected to become stronger as
the densit... | [
{
"created": "Wed, 24 Jan 2024 19:04:26 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2024 15:48:37 GMT",
"version": "v2"
}
] | 2024-05-17 | [
[
"Choudhury",
"Shibendu Gupta",
""
],
[
"Maity",
"Sagar Kumar",
""
],
[
"Lahiri",
"Amitabha",
""
]
] | Intrinsic spin of fermions can generate torsion in spacetime. This torsion is a non-propagating field that can be integrated out, leaving an effective non-universal four-fermion interaction. This geometrical interaction affects fermions inside a matter distribution and can be expected to become stronger as the density ... |
1710.07280 | Johan Hansson | Johan Hansson, Stephane Francois | Testing Quantum Gravity | Honorable Mention Award in the 2017 Essay Competition of the Gravity
Research Foundation, 9 pages | International Journal of Modern Physics D, Vol. 26, 1743003 (2017) | 10.1142/S0218271817430039 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for a theory of quantum gravity is the most fundamental problem in
all of theoretical physics, but there are as yet no experimental results at all
to guide this endeavor. What seems to be needed is a pragmatic way to test if
gravitation really occurs between quantum objects or not. In this article we
sugge... | [
{
"created": "Thu, 19 Oct 2017 13:20:32 GMT",
"version": "v1"
}
] | 2017-10-23 | [
[
"Hansson",
"Johan",
""
],
[
"Francois",
"Stephane",
""
]
] | The search for a theory of quantum gravity is the most fundamental problem in all of theoretical physics, but there are as yet no experimental results at all to guide this endeavor. What seems to be needed is a pragmatic way to test if gravitation really occurs between quantum objects or not. In this article we suggest... |
gr-qc/0701059 | Bijan Saha | Bijan Saha | Interacting spinor and scalar fields in Bianchi cosmology | 14 pages, 6 figures | null | null | null | gr-qc | null | A self-consistent system of interacting spinor and scalar fields is
considered within the scope of Bianchi type VI cosmological model filled with a
perfect fluid. The contribution of the cosmological constant ($\Lambda$-term)
is taken into account as well. Exact self-consistent solutions to the field
equations are ob... | [
{
"created": "Wed, 10 Jan 2007 11:56:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Saha",
"Bijan",
""
]
] | A self-consistent system of interacting spinor and scalar fields is considered within the scope of Bianchi type VI cosmological model filled with a perfect fluid. The contribution of the cosmological constant ($\Lambda$-term) is taken into account as well. Exact self-consistent solutions to the field equations are obta... |
2012.10227 | Alessio Marrani | Piero Truini, Alessio Marrani, Michael Rios, Klee Irwin | Space, Matter and Interactions in a Quantum Early Universe. Part I :
Kac-Moody and Borcherds Algebras | 1+27 pages, 4 tables, 2 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a quantum model for the Universe at its early stages,
formulating a mechanism for the expansion of space and matter from a quantum
initial condition, with particle interactions and creation driven by algebraic
extensions of the Kac-Moody Lie algebra $\mathbf{e_9}$. We investigate
Kac-Moody and Borcherds ... | [
{
"created": "Fri, 18 Dec 2020 13:45:22 GMT",
"version": "v1"
}
] | 2020-12-21 | [
[
"Truini",
"Piero",
""
],
[
"Marrani",
"Alessio",
""
],
[
"Rios",
"Michael",
""
],
[
"Irwin",
"Klee",
""
]
] | We introduce a quantum model for the Universe at its early stages, formulating a mechanism for the expansion of space and matter from a quantum initial condition, with particle interactions and creation driven by algebraic extensions of the Kac-Moody Lie algebra $\mathbf{e_9}$. We investigate Kac-Moody and Borcherds al... |
1006.2725 | Alexander Kamenshchik | A. Yu. Kamenshchik | The problem of singularities and chaos in cosmology | 17 pages | Phys.Usp.53:301-309,2010 | 10.3367/UFNe.0180.201003h.0313 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider different aspects of the problem of cosmological singularity such
as the BKL oscillatory approach to the singularity, the new features of the
cosmological dynamics in the neighbourhood of the singularity in
multidimensional and superstring cosmological models and their connections with
such a modern branc... | [
{
"created": "Mon, 14 Jun 2010 14:24:49 GMT",
"version": "v1"
}
] | 2010-12-17 | [
[
"Kamenshchik",
"A. Yu.",
""
]
] | We consider different aspects of the problem of cosmological singularity such as the BKL oscillatory approach to the singularity, the new features of the cosmological dynamics in the neighbourhood of the singularity in multidimensional and superstring cosmological models and their connections with such a modern branch ... |
gr-qc/9911010 | Jorge Pullin | Cayetano Di Bartolo, Rodolfo Gambini, Jorge Griego, Jorge Pullin | Canonical quantum gravity in the Vassiliev invariants arena: II.
Constraints, habitats and consistency of the constraint algebra | 20 Pages, RevTex, many figures included with psfig | Class.Quant.Grav. 17 (2000) 3239-3264 | 10.1088/0264-9381/17/16/310 | CGPG-99/11-2 | gr-qc hep-th | null | In a companion paper we introduced a kinematical arena for the discussion of
the constraints of canonical quantum gravity in the spin network representation
based on Vassiliev invariants. In this paper we introduce the Hamiltonian
constraint, extend the space of states to non-diffeomorphism invariant
``habitats'' and... | [
{
"created": "Wed, 3 Nov 1999 09:06:43 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Di Bartolo",
"Cayetano",
""
],
[
"Gambini",
"Rodolfo",
""
],
[
"Griego",
"Jorge",
""
],
[
"Pullin",
"Jorge",
""
]
] | In a companion paper we introduced a kinematical arena for the discussion of the constraints of canonical quantum gravity in the spin network representation based on Vassiliev invariants. In this paper we introduce the Hamiltonian constraint, extend the space of states to non-diffeomorphism invariant ``habitats'' and c... |
gr-qc/9806032 | Benjamin C. Harms | R. Casadio and B. Harms | Charged Dilatonic Black Holes: String frame vs Einstein frame | REVTeX, 11 pages, 3 EPS figures | Mod.Phys.Lett.A14:1089-1104,1999 | 10.1142/S0217732399001176 | UAHEP 983 | gr-qc hep-th | null | The descriptions of Reissner-Nordstroem and Kerr-Newman dilatonic black holes
in the Einstein frame are compared to those in the string frame. We describe
various physical measurements in the two frames and show which experiments can
distinguish between the two frames. In particular we discuss the gyromagnetic
ratios... | [
{
"created": "Mon, 8 Jun 1998 22:20:58 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jun 1999 16:53:27 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Casadio",
"R.",
""
],
[
"Harms",
"B.",
""
]
] | The descriptions of Reissner-Nordstroem and Kerr-Newman dilatonic black holes in the Einstein frame are compared to those in the string frame. We describe various physical measurements in the two frames and show which experiments can distinguish between the two frames. In particular we discuss the gyromagnetic ratios o... |
2105.15143 | Piyali Bhar | Piyali Bhar | Strange star with Krori-Barua potential in presence of anisotropy | Accepted for publication in International Journal of Geometric
Methods in Modern Physics | Int.J.Geom.Meth.Mod.Phys. Vol. 18, No. 07, 2150097 (2021) | 10.1142/S0219887821500973 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In present paper a well-behaved new model of anisotropic compact star in
(3+1)-dimensional spacetime has been investigated in the background of
Einstein's general theory of relativity. The model has been developed by
choosing $g_rr$ component as Krori-Barua (KB) ansatz [Krori and Barua in J.
Phys. A, Math. Gen. 8:508... | [
{
"created": "Fri, 28 May 2021 06:18:38 GMT",
"version": "v1"
}
] | 2021-06-18 | [
[
"Bhar",
"Piyali",
""
]
] | In present paper a well-behaved new model of anisotropic compact star in (3+1)-dimensional spacetime has been investigated in the background of Einstein's general theory of relativity. The model has been developed by choosing $g_rr$ component as Krori-Barua (KB) ansatz [Krori and Barua in J. Phys. A, Math. Gen. 8:508, ... |
gr-qc/0305050 | Esposito Giampiero | Elisabetta Di Grezia, Giampiero Esposito, Agostino Funel, Gianpiero
Mangano, Gennaro Miele | Spacetime Noncommutativity and Antisymmetric Tensor Dynamics in the
Early Universe | 25 pages, Revtex file, 4 figures in attachment | Phys.Rev. D68 (2003) 105012 | 10.1103/PhysRevD.68.105012 | DSF preprint 2003/14 | gr-qc hep-th | null | This paper investigates the possible cosmological implications of the
presence of an antisymmetric tensor field related to a lack of commutatitivity
of spacetime coordinates at the Planck era. For this purpose, such a field is
promoted to a dynamical variable, inspired by tensor formalism. By working to
quadratic ord... | [
{
"created": "Tue, 13 May 2003 15:37:11 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jul 2003 16:46:59 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Di Grezia",
"Elisabetta",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Funel",
"Agostino",
""
],
[
"Mangano",
"Gianpiero",
""
],
[
"Miele",
"Gennaro",
""
]
] | This paper investigates the possible cosmological implications of the presence of an antisymmetric tensor field related to a lack of commutatitivity of spacetime coordinates at the Planck era. For this purpose, such a field is promoted to a dynamical variable, inspired by tensor formalism. By working to quadratic order... |
gr-qc/0211010 | Guihua Tian | Guihua Tian and Zhao Zheng | Can an observer really catch up with light | 6 pages, no figures, submited to Physical Review D | Class.Quant.Grav. 20 (2003) 3927-3932 | 10.1088/0264-9381/20/18/306 | null | gr-qc | null | Given a null geodesic $\gamma_0(\lambda)$ with a point $r$ in $(p,q)$
conjugate to $p$ along $\gamma_0(\lambda)$, there will be a variation of
$\gamma_0(\lambda)$ which will give a time-like curve from $p$ to $q$. This is
a well-known theory proved in the famous book\cite{2}. In the paper we prove
that the time-like ... | [
{
"created": "Sun, 3 Nov 2002 08:56:26 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Tian",
"Guihua",
""
],
[
"Zheng",
"Zhao",
""
]
] | Given a null geodesic $\gamma_0(\lambda)$ with a point $r$ in $(p,q)$ conjugate to $p$ along $\gamma_0(\lambda)$, there will be a variation of $\gamma_0(\lambda)$ which will give a time-like curve from $p$ to $q$. This is a well-known theory proved in the famous book\cite{2}. In the paper we prove that the time-like cu... |
2404.03853 | Nikolay Sukhov | Nikolay Sukhov | A survey of ultra-compact rotating boson star spacetimes | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Solitonic boson stars (SBS) are compact shell-like objects with an inside
having a nearly constant value of scalar field bounded by a thin shell where
the scalar field rapidly changes. While the spherically symmetric SBS can be
described by an analytical approximation that works well in the thin-shell
case, no such a... | [
{
"created": "Fri, 5 Apr 2024 01:10:53 GMT",
"version": "v1"
}
] | 2024-04-08 | [
[
"Sukhov",
"Nikolay",
""
]
] | Solitonic boson stars (SBS) are compact shell-like objects with an inside having a nearly constant value of scalar field bounded by a thin shell where the scalar field rapidly changes. While the spherically symmetric SBS can be described by an analytical approximation that works well in the thin-shell case, no such app... |
1602.09047 | Francesco Belgiorno | F. Belgiorno, S. L. Cacciatori and F. Dalla Piazza | Tunneling method for Hawking radiation in the Nariai case | 11 pages. Revised version, published in Gen. Rel. Grav | General Relativity and Gravitation 49 (2017) no.8, 109 | 10.1007/s10714-017-2275-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the tunneling picture for the Hawking effect in light of the
charged Nariai manifold, because this general relativistic solution, which
displays two horizons, provides the bonus to allow the knowledge of exact
solutions of the field equations. We first perform a revisitation of the
tunneling ansatz in the ... | [
{
"created": "Mon, 29 Feb 2016 17:15:53 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Aug 2017 14:33:55 GMT",
"version": "v2"
}
] | 2017-08-16 | [
[
"Belgiorno",
"F.",
""
],
[
"Cacciatori",
"S. L.",
""
],
[
"Piazza",
"F. Dalla",
""
]
] | We revisit the tunneling picture for the Hawking effect in light of the charged Nariai manifold, because this general relativistic solution, which displays two horizons, provides the bonus to allow the knowledge of exact solutions of the field equations. We first perform a revisitation of the tunneling ansatz in the fr... |
gr-qc/9603023 | Romualdo Tresguerres | A.L\'opez--Pinto, A.Tiemblo and R.Tresguerres | Hamiltonian Poincar\'e Gauge Theory of Gravitation | 38 pages, plainTeX | Class.Quant.Grav. 14 (1997) 549-575 | 10.1088/0264-9381/14/2/027 | IMAFF 96/41 | gr-qc hep-th | null | We develop a Hamiltonian formalism suitable to be applied to gauge theories
in the presence of Gravitation, and to Gravity itself when considered as a
gauge theory. It is based on a nonlinear realization of the Poincar\'e group,
taken as the local spacetime group of the gravitational gauge theory, with
$SO(3)$ as the... | [
{
"created": "Fri, 15 Mar 1996 11:43:37 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"López--Pinto",
"A.",
""
],
[
"Tiemblo",
"A.",
""
],
[
"Tresguerres",
"R.",
""
]
] | We develop a Hamiltonian formalism suitable to be applied to gauge theories in the presence of Gravitation, and to Gravity itself when considered as a gauge theory. It is based on a nonlinear realization of the Poincar\'e group, taken as the local spacetime group of the gravitational gauge theory, with $SO(3)$ as the c... |
2309.05094 | Gray Reid | Gray D. Reid, Matthew W. Choptuik | RCCZ4: A Reference Metric Approach to Z4 | 19 pages, 18 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hyperbolic formulations of numerical relativity due to Baumgarte,
Shapiro, Shibata & Nakamura (BSSN) and Nagy Ortiz & Reula (NOR), among others,
achieve stability through the effective embedding of general relativity within
the larger Z4 system. In doing so, various elliptic constraints are promoted to
dynamical ... | [
{
"created": "Sun, 10 Sep 2023 17:41:25 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 07:48:07 GMT",
"version": "v2"
}
] | 2023-12-22 | [
[
"Reid",
"Gray D.",
""
],
[
"Choptuik",
"Matthew W.",
""
]
] | The hyperbolic formulations of numerical relativity due to Baumgarte, Shapiro, Shibata & Nakamura (BSSN) and Nagy Ortiz & Reula (NOR), among others, achieve stability through the effective embedding of general relativity within the larger Z4 system. In doing so, various elliptic constraints are promoted to dynamical de... |
2403.13876 | Mark Ho-Yeuk Cheung | Mark Ho-Yeuk Cheung, Ken K. Y. Ng, Miguel Zumalac\'arregui, Emanuele
Berti | Probing minihalo lenses with diffracted gravitational waves | 19 pages, 9 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When gravitational waves pass near a gravitating object, they are deflected,
or lensed. If the object is massive, such that the wavelength of the waves is
small compared to its gravitational size, lensed gravitational wave events can
be identified when multiple signals are detected at different times. However,
when t... | [
{
"created": "Wed, 20 Mar 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-03-22 | [
[
"Cheung",
"Mark Ho-Yeuk",
""
],
[
"Ng",
"Ken K. Y.",
""
],
[
"Zumalacárregui",
"Miguel",
""
],
[
"Berti",
"Emanuele",
""
]
] | When gravitational waves pass near a gravitating object, they are deflected, or lensed. If the object is massive, such that the wavelength of the waves is small compared to its gravitational size, lensed gravitational wave events can be identified when multiple signals are detected at different times. However, when the... |
2403.01397 | Supriya Pan | Sudip Halder, Jaume de Haro, Tapan Saha, Supriya Pan | Phase space analysis of sign-shifting interacting dark energy models | 33 pages including the references, 6 tables and 19 figures; version
accepted by Phys. Rev. D | null | null | null | gr-qc astro-ph.CO math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | The theory of non-gravitational interaction between a pressure-less dark
matter (DM) and dark energy (DE) is a phenomenologically rich cosmological
domain which has received magnificent attention in the community. In the
present article we have considered some interacting scenarios with some novel
features: the inter... | [
{
"created": "Sun, 3 Mar 2024 05:16:42 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Halder",
"Sudip",
""
],
[
"de Haro",
"Jaume",
""
],
[
"Saha",
"Tapan",
""
],
[
"Pan",
"Supriya",
""
]
] | The theory of non-gravitational interaction between a pressure-less dark matter (DM) and dark energy (DE) is a phenomenologically rich cosmological domain which has received magnificent attention in the community. In the present article we have considered some interacting scenarios with some novel features: the interac... |
1711.00833 | Barun Kumar Pal | Barun Kumar Pal | Mutated hilltop inflation revisited | 17 pages, 13 figures. Accepted for publication in EPJC | Eur. Phys. J. C, 78:358 (2018) | 10.1140/epjc/s10052-018-5856-3 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we re-investigate pros and cons of mutated hilltop inflation.
Applying Hamilton-Jacobi formalism we solve inflationary dynamics and find that
inflation goes on along the ${\cal W}_{-1}$ branch of the Lambert function.
Depending on the model parameter mutated hilltop model renders two types of
inflationar... | [
{
"created": "Thu, 2 Nov 2017 17:36:16 GMT",
"version": "v1"
},
{
"created": "Tue, 1 May 2018 17:58:44 GMT",
"version": "v2"
}
] | 2018-05-15 | [
[
"Pal",
"Barun Kumar",
""
]
] | In this work we re-investigate pros and cons of mutated hilltop inflation. Applying Hamilton-Jacobi formalism we solve inflationary dynamics and find that inflation goes on along the ${\cal W}_{-1}$ branch of the Lambert function. Depending on the model parameter mutated hilltop model renders two types of inflationary ... |
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