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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1101.4405 | Francisco Lobo | Jos\'e P. Mimoso, Francisco S. N. Lobo | The variation of G in a negatively curved space-time | 7 pages, 5 figures. Contribution to the Joint European and National
Astronomy Meeting (JENAM) 2010; based on a talk given by JPM in the "From
Varying Couplings to Fundamental Physics" Symposium | null | 10.1007/978-3-642-19397-2_4 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor (ST) gravity theories provide an appropriate theoretical
framework for the variation of Newton's fundamental constant, conveyed by the
dynamics of a scalar-field non-minimally coupled to the space-time geometry.
The experimental scrutiny of scalar-tensor gravity theories has led to a
detailed analysis o... | [
{
"created": "Sun, 23 Jan 2011 21:37:15 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Mimoso",
"José P.",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | Scalar-tensor (ST) gravity theories provide an appropriate theoretical framework for the variation of Newton's fundamental constant, conveyed by the dynamics of a scalar-field non-minimally coupled to the space-time geometry. The experimental scrutiny of scalar-tensor gravity theories has led to a detailed analysis of ... |
gr-qc/9603036 | Saha Bijan | Yu. P. Rybakov, B. Saha and G. N. Shikin | Droplet-like Solutions to the Nonlinear Scalar Field Equations in the
Robertson-Walker Space-time and their Stability | LaTeX, 6 pages | null | null | JINR Preprint E2-95-197 | gr-qc | null | Exact droplet-like solutions to the nonlinear scalar field equations have
been obtained in the Robertson-Walker space-time and their linearized stability
has been proved.
| [
{
"created": "Fri, 22 Mar 1996 14:02:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rybakov",
"Yu. P.",
""
],
[
"Saha",
"B.",
""
],
[
"Shikin",
"G. N.",
""
]
] | Exact droplet-like solutions to the nonlinear scalar field equations have been obtained in the Robertson-Walker space-time and their linearized stability has been proved. |
gr-qc/0602098 | Domenico Giulini | Matteo Carrera and Domenico Giulini | On the influence of the global cosmological expansion on the local
dynamics in the Solar System | 37 pages, 2 figures | null | null | Freiburg THEP-06/03 | gr-qc astro-ph | null | In this expository paper we address the question of whether, and to what
extent, the cosmological expansion influences the dynamics on small scales (as
compared to cosmological ones), particularly in our Solar System. We
distinguish between dynamical and kinematical effects and critically review the
status of both as... | [
{
"created": "Fri, 24 Feb 2006 16:05:28 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Feb 2006 15:35:29 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Carrera",
"Matteo",
""
],
[
"Giulini",
"Domenico",
""
]
] | In this expository paper we address the question of whether, and to what extent, the cosmological expansion influences the dynamics on small scales (as compared to cosmological ones), particularly in our Solar System. We distinguish between dynamical and kinematical effects and critically review the status of both as p... |
gr-qc/0107075 | Michael John Pfenning | Michael J. Pfenning | Quantum Inequalities for the Electromagnetic Field | 19 pages, 1 table and 1 figure. RevTex style | Phys.Rev. D65 (2002) 024009 | 10.1103/PhysRevD.65.024009 | null | gr-qc hep-th math-ph math.MP | null | A quantum inequality for the quantized electromagnetic field is developed for
observers in static curved spacetimes. The quantum inequality derived is a
generalized expression given by a mode function expansion of the four-vector
potential, and the sampling function used to weight the energy integrals is
left arbitra... | [
{
"created": "Mon, 23 Jul 2001 20:09:07 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Pfenning",
"Michael J.",
""
]
] | A quantum inequality for the quantized electromagnetic field is developed for observers in static curved spacetimes. The quantum inequality derived is a generalized expression given by a mode function expansion of the four-vector potential, and the sampling function used to weight the energy integrals is left arbitrary... |
2306.02464 | Alessandro Santoni | Alessandro Santoni, Jorge Alfaro and Alex Soto | Graviton Mass Bounds in Very Special Relativity from Binary Pulsar's
Gravitational Waves | null | null | 10.1103/PhysRevD.108.044072 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work we study the gravitational radiation produced by a keplerian
binary system within the context of Very Special Linear Gravity (VSLG), a novel
theory of linearized gravity in the framework of Very Special Relativity (VSR)
allowing for a gauge-invariant mass $m_g$ of the graviton. For this task, we
exploit ... | [
{
"created": "Sun, 4 Jun 2023 20:43:42 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2023 16:52:44 GMT",
"version": "v2"
},
{
"created": "Thu, 2 May 2024 14:44:57 GMT",
"version": "v3"
}
] | 2024-05-03 | [
[
"Santoni",
"Alessandro",
""
],
[
"Alfaro",
"Jorge",
""
],
[
"Soto",
"Alex",
""
]
] | In this work we study the gravitational radiation produced by a keplerian binary system within the context of Very Special Linear Gravity (VSLG), a novel theory of linearized gravity in the framework of Very Special Relativity (VSR) allowing for a gauge-invariant mass $m_g$ of the graviton. For this task, we exploit Ef... |
1006.1968 | Nejat Yilmaz | Nejat Tevfik Yilmaz | Braneworld Gravity in Symmetric Space Bulk | 49 pages | Class.Quant.Grav.27:145019,2010 | 10.1088/0264-9381/27/14/145019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By considering the p-brane motion in G/K symmetric space bulk we identify the
G-invariant bulk metric in the solvable lie algebra gauge of the brane action.
After calculating the Levi-Civita connection of this bulk metric we use it in
the Gauss equation to compute the braneworld curvature in terms of the bulk
coordin... | [
{
"created": "Thu, 10 Jun 2010 07:39:57 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Yilmaz",
"Nejat Tevfik",
""
]
] | By considering the p-brane motion in G/K symmetric space bulk we identify the G-invariant bulk metric in the solvable lie algebra gauge of the brane action. After calculating the Levi-Civita connection of this bulk metric we use it in the Gauss equation to compute the braneworld curvature in terms of the bulk coordinat... |
1601.04997 | Felipe Falciano | G.N.Bremm and F.T.Falciano | Nonlocal Effects in Black Body Radiation | 10 pages, 5 figures | Ann. Phys. 527, 265-277 (2015) | 10.1002/andp.201400214 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonlocal electrodynamics is a formalism developed to include nonlocal effects
in the measurement process caused by the non-inertial state of the observers.
This theory modifies Maxwell's electrodynamics by eliminating the hypothesis of
locality that assumes an accelerated observer simultaneously equivalent to a
comov... | [
{
"created": "Tue, 19 Jan 2016 16:59:24 GMT",
"version": "v1"
}
] | 2016-11-11 | [
[
"Bremm",
"G. N.",
""
],
[
"Falciano",
"F. T.",
""
]
] | Nonlocal electrodynamics is a formalism developed to include nonlocal effects in the measurement process caused by the non-inertial state of the observers. This theory modifies Maxwell's electrodynamics by eliminating the hypothesis of locality that assumes an accelerated observer simultaneously equivalent to a comovin... |
gr-qc/0606085 | Supratik Pal | Supratik Pal (IIT Kharagpur & Jadavpur University) | Structure formation on the brane: A mimicry | 7 pages. Matches published version | Phys.Rev. D74 (2006) 024005 | 10.1103/PhysRevD.74.024005 | null | gr-qc astro-ph hep-th | null | We show how braneworld cosmology with bulk matter can explain structure
formation. In this scenario, the nonlocal corrections to the Friedmann
equations supply a Weyl fluid that can dominate over matter at late times due
to the energy exchange between the brane and the bulk. We demonstrate that the
presence of the We... | [
{
"created": "Tue, 20 Jun 2006 05:49:25 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2006 06:33:08 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Pal",
"Supratik",
"",
"IIT Kharagpur & Jadavpur University"
]
] | We show how braneworld cosmology with bulk matter can explain structure formation. In this scenario, the nonlocal corrections to the Friedmann equations supply a Weyl fluid that can dominate over matter at late times due to the energy exchange between the brane and the bulk. We demonstrate that the presence of the Weyl... |
1001.3921 | Yong-Wan Kim | Yun Soo Myung, Yong-Wan Kim, Woo-Sik Son, Young-Jai Park | Mixmaster universe in the z=3 deformed Ho\v{r}ava-Lifshitz gravity | 13 pages, 7 figures, version to appear in JHEP | null | 10.1007/JHEP03(2010)085 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The z=3 deformed Horava-Lifshitz gravity with coupling constants \omega and
\epsilon leads to a nonrelativistic "mixmaster" cosmological model. The
potential of theory is given by the sum of IR and UV potentials in the ADM
Hamiltonian formalism. It turns out that the presence of the UV-potential
cannot suppress chaot... | [
{
"created": "Fri, 22 Jan 2010 06:38:34 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2010 14:06:13 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Myung",
"Yun Soo",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Son",
"Woo-Sik",
""
],
[
"Park",
"Young-Jai",
""
]
] | The z=3 deformed Horava-Lifshitz gravity with coupling constants \omega and \epsilon leads to a nonrelativistic "mixmaster" cosmological model. The potential of theory is given by the sum of IR and UV potentials in the ADM Hamiltonian formalism. It turns out that the presence of the UV-potential cannot suppress chaotic... |
gr-qc/0610150 | Chandrasekher Mukku Prof. | Chandrasekher Mukku, Swadesh M. Mahajan, Bindu A. Bambah | On a Raychaudhuri equation for hot gravitating fluids | 13 pages, Invited contribution to Pramana special issue dedicated to
A.K. Raychaudhuri, "The Raychaudhuri equation and its role in Modern
Cosmology". Pramana style files included | Pramana69:137-146,2007 | 10.1007/s12043-007-0115-4 | null | gr-qc | null | We generalize the Raychaudhuri equation for the evolution of a self
gravitating fluid to include an Abelian and non-Abelian hybrid magneto fluid at
a finite temperature. The aim is to utilize this equation for investigating the
dynamics of astrophysical high temperature Abelian and non-Abelian plasmas.
| [
{
"created": "Mon, 30 Oct 2006 07:38:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mukku",
"Chandrasekher",
""
],
[
"Mahajan",
"Swadesh M.",
""
],
[
"Bambah",
"Bindu A.",
""
]
] | We generalize the Raychaudhuri equation for the evolution of a self gravitating fluid to include an Abelian and non-Abelian hybrid magneto fluid at a finite temperature. The aim is to utilize this equation for investigating the dynamics of astrophysical high temperature Abelian and non-Abelian plasmas. |
gr-qc/0401080 | Muhammad Sharif | M. Sharif | Force Behaviour in Radiation-Dominated Friedmann Universe | null | Chin.J.Phys. 40 (2002) 590-593 | null | null | gr-qc | null | We consider radiation-dominated Friedmann universe and evaluate its force
four-vector and momentum. We analyse and compare the results with the already
evaluated for the matter-dominated Friedmann model. It turns out that the
results are physically acceptable.
| [
{
"created": "Mon, 19 Jan 2004 06:06:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sharif",
"M.",
""
]
] | We consider radiation-dominated Friedmann universe and evaluate its force four-vector and momentum. We analyse and compare the results with the already evaluated for the matter-dominated Friedmann model. It turns out that the results are physically acceptable. |
2001.07996 | Jun-Jin Peng | Meng-Liang Wang, Jun-Jin Peng | A note on the definition of gravitational energy for quadratic curvature
gravity via topological regularization | 8 pages, NO figures | Chinese Physics B, 2020, 29 (12): 120401 | 10.1088/1674-1056/abb3e0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of four-dimensional quadratic curvature gravities in the
appearance of a negative cosmological constant, a definition for the
gravitational energy of solutions with anti-de Sitter (AdS) asymptotics was put
forward in Ref. [1]. This was achieved by adding proper topological invariant
terms to the ... | [
{
"created": "Wed, 22 Jan 2020 13:07:39 GMT",
"version": "v1"
}
] | 2023-05-23 | [
[
"Wang",
"Meng-Liang",
""
],
[
"Peng",
"Jun-Jin",
""
]
] | Within the framework of four-dimensional quadratic curvature gravities in the appearance of a negative cosmological constant, a definition for the gravitational energy of solutions with anti-de Sitter (AdS) asymptotics was put forward in Ref. [1]. This was achieved by adding proper topological invariant terms to the gr... |
1607.04882 | Rosemberg Toala Enriquez | Rosemberg Toal\'a Enr\'iquez | Stationarity of asymptotically flat non-radiating electrovacuum
spacetimes | 57 pages, 2 figures, 1 table | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is proven that a solution to the Einstein-Maxwell equations whose
gravitational and electromagnetic radiation fields vanish is in fact stationary
in a neighbourhood of spatial infinity. That is, if the Weyl and Faraday
tensors decay suitably fast, then there exists a time-like Killing vector field
in the region ou... | [
{
"created": "Sun, 17 Jul 2016 15:45:16 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Aug 2016 12:56:09 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Enríquez",
"Rosemberg Toalá",
""
]
] | It is proven that a solution to the Einstein-Maxwell equations whose gravitational and electromagnetic radiation fields vanish is in fact stationary in a neighbourhood of spatial infinity. That is, if the Weyl and Faraday tensors decay suitably fast, then there exists a time-like Killing vector field in the region outs... |
1610.07990 | Dr. Sudhaker Upadhyay | Mir Hameeda, Sudhaker Upadhyay, Mir Faizal and Ahmed Farag Ali | Effects of Cosmological Constant on Clustering of Galaxies | 6 pages, 1 figure, Published in MNRAS | MNRAS 463, 3699-3704 (2016) | 10.1093/mnras/stw2202 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we analyse the effect of the expansion of the universe on the
clustering of galaxies. We evaluate the configurational integral for
interacting system of galaxies in an expanding universe by including effects
produced by the cosmological constant. The gravitational partition function is
obtained using t... | [
{
"created": "Mon, 17 Oct 2016 10:18:11 GMT",
"version": "v1"
}
] | 2016-10-26 | [
[
"Hameeda",
"Mir",
""
],
[
"Upadhyay",
"Sudhaker",
""
],
[
"Faizal",
"Mir",
""
],
[
"Ali",
"Ahmed Farag",
""
]
] | In this paper, we analyse the effect of the expansion of the universe on the clustering of galaxies. We evaluate the configurational integral for interacting system of galaxies in an expanding universe by including effects produced by the cosmological constant. The gravitational partition function is obtained using thi... |
2401.10351 | Marcello Miranda | Marcello Miranda, Serena Giardino, Andrea Giusti, and Lavinia
Heisenberg | First-order thermodynamics of Horndeski cosmology | 16 pages. Matches published version in Phys. Rev. D | Phys. Rev. D 109, no.12, 124033 (2024) | 10.1103/PhysRevD.109.124033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We delve into the first-order thermodynamics of Horndeski gravity, focusing
on spatially flat, homogeneous, and isotropic cosmologies. Our exploration
begins with a comprehensive review of the effective fluid representation within
viable Horndeski gravity. Notably, we uncover a surprising alignment between
the consti... | [
{
"created": "Thu, 18 Jan 2024 19:40:45 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2024 16:24:15 GMT",
"version": "v2"
}
] | 2024-06-18 | [
[
"Miranda",
"Marcello",
""
],
[
"Giardino",
"Serena",
""
],
[
"Giusti",
"Andrea",
""
],
[
"Heisenberg",
"Lavinia",
""
]
] | We delve into the first-order thermodynamics of Horndeski gravity, focusing on spatially flat, homogeneous, and isotropic cosmologies. Our exploration begins with a comprehensive review of the effective fluid representation within viable Horndeski gravity. Notably, we uncover a surprising alignment between the constitu... |
0909.2994 | Eric Poisson | Eric Poisson | Constructing the self-force | 18 pages, 5 figures, lecture given at the CNRS School on Mass
(Orleans, June 2008) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present an overview of the methods involved in the computation of the
scalar, electromagnetic, and gravitational self-forces acting on a point
particle moving in a curved spacetime. For simplicity, the focus here will be
on the scalar self-force. The lecture follows closely my review article on this
subject publish... | [
{
"created": "Wed, 16 Sep 2009 12:21:54 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Poisson",
"Eric",
""
]
] | I present an overview of the methods involved in the computation of the scalar, electromagnetic, and gravitational self-forces acting on a point particle moving in a curved spacetime. For simplicity, the focus here will be on the scalar self-force. The lecture follows closely my review article on this subject published... |
2406.19960 | Simony Santos Da Costa | Davide Campanella Galanti, Pietro Conzinu, Giovanni Marozzi and Simony
Santos da Costa | Gauge invariant quantum backreaction in U(1) axion inflation | 14 pages, 2 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We evaluate the quantum backreaction due to a gauge field coupled to a pseudo
scalar field driving a slow-roll inflationary stage, the so-called axion
inflation. The backreaction is evaluated for the first time using a gauge
invariant approach, going to second order in perturbation theory and taking in
consideration ... | [
{
"created": "Fri, 28 Jun 2024 14:48:05 GMT",
"version": "v1"
}
] | 2024-07-01 | [
[
"Galanti",
"Davide Campanella",
""
],
[
"Conzinu",
"Pietro",
""
],
[
"Marozzi",
"Giovanni",
""
],
[
"da Costa",
"Simony Santos",
""
]
] | We evaluate the quantum backreaction due to a gauge field coupled to a pseudo scalar field driving a slow-roll inflationary stage, the so-called axion inflation. The backreaction is evaluated for the first time using a gauge invariant approach, going to second order in perturbation theory and taking in consideration in... |
1910.05097 | Ornella Juliana Piccinni | Ornella J. Piccinni, P. Astone, S. D'Antonio, S. Frasca, G. Intini, I.
La Rosa, P. Leaci, S. Mastrogiovanni, A. Miller and C. Palomba | Directed search for continuous gravitational-wave signals from the
Galactic Center in the Advanced LIGO second observing run | 8 pages, 4 figures | Phys. Rev. D 101, 082004 (2020) | 10.1103/PhysRevD.101.082004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present the results of a search for continuous gravitational
waves from the Galactic Center using LIGO O2 data. The search uses the
Band-Sampled-Data directed search pipeline, which performs a semi-coherent
wide-parameter-space search, exploiting the robustness of the FrequencyHough
transform algorith... | [
{
"created": "Fri, 11 Oct 2019 12:03:17 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2019 01:03:35 GMT",
"version": "v2"
},
{
"created": "Sat, 2 May 2020 17:15:26 GMT",
"version": "v3"
}
] | 2020-05-06 | [
[
"Piccinni",
"Ornella J.",
""
],
[
"Astone",
"P.",
""
],
[
"D'Antonio",
"S.",
""
],
[
"Frasca",
"S.",
""
],
[
"Intini",
"G.",
""
],
[
"La Rosa",
"I.",
""
],
[
"Leaci",
"P.",
""
],
[
"Mastrogiovanni",... | In this work we present the results of a search for continuous gravitational waves from the Galactic Center using LIGO O2 data. The search uses the Band-Sampled-Data directed search pipeline, which performs a semi-coherent wide-parameter-space search, exploiting the robustness of the FrequencyHough transform algorithm.... |
1512.05434 | Andronikos Paliathanasis | Andronikos Paliathanasis and Babak Vakili | Closed-form solutions of the Wheeler-DeWitt equation in a scalar-vector
field cosmological model by Lie symmetries | 14 pages, 2 figures; to appear in Gen. Rel. Grav | Gen. Rel. Grav. 48, 13, (2016) | 10.1007/s10714-015-2010-5 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply as selection rule to determine the unknown functions of a
cosmological model the existence of Lie point symmetries for the Wheeler-DeWitt
equation of quantum gravity. Our cosmological setting consists of a flat
Friedmann-Robertson-Walker metric having the scale factor $a(t)$, a scalar
field with potential fu... | [
{
"created": "Thu, 17 Dec 2015 01:27:51 GMT",
"version": "v1"
}
] | 2016-01-01 | [
[
"Paliathanasis",
"Andronikos",
""
],
[
"Vakili",
"Babak",
""
]
] | We apply as selection rule to determine the unknown functions of a cosmological model the existence of Lie point symmetries for the Wheeler-DeWitt equation of quantum gravity. Our cosmological setting consists of a flat Friedmann-Robertson-Walker metric having the scale factor $a(t)$, a scalar field with potential func... |
2304.02167 | Matteo Luca Ruggiero | Matteo Luca Ruggiero, Davide Astesiano | A tale of analogies: gravitomagnetic effects, rotating sources,
observers and all that | 54 pages, Invited Topical Review for Journal of Physics
Communications | J. Phys. Commun. 7 112001 (2023) | 10.1088/2399-6528/ad08cf | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitoelectromagnetic analogies are somewhat ubiquitous in General
Relativity, and they are often used to explain peculiar effects of Einstein's
theory of gravity in terms of familiar results from classical electromagnetism.
Perhaps, the best known of these analogy pertains to the similarity between the
equations of... | [
{
"created": "Tue, 4 Apr 2023 23:50:19 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 2023 12:28:12 GMT",
"version": "v2"
}
] | 2023-11-20 | [
[
"Ruggiero",
"Matteo Luca",
""
],
[
"Astesiano",
"Davide",
""
]
] | Gravitoelectromagnetic analogies are somewhat ubiquitous in General Relativity, and they are often used to explain peculiar effects of Einstein's theory of gravity in terms of familiar results from classical electromagnetism. Perhaps, the best known of these analogy pertains to the similarity between the equations of e... |
gr-qc/9809011 | null | Semyon Pol'shin | Group Theoretical Examination of the Relativistic Wave Equations on
Curved Spaces. III. Real reducible spaces | 14 pages, LATEX, no figures | null | null | null | gr-qc | null | The group theoretical approach to the relativistic wave equations on the real
reducible spaces for spin~0, 1/2 and~1 massless particles is considered. The
invariant wave equations which determine the appropriate irreducible
representations are constructed. The coincidence of these equations with the
general-covariant... | [
{
"created": "Wed, 2 Sep 1998 13:59:10 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Pol'shin",
"Semyon",
""
]
] | The group theoretical approach to the relativistic wave equations on the real reducible spaces for spin~0, 1/2 and~1 massless particles is considered. The invariant wave equations which determine the appropriate irreducible representations are constructed. The coincidence of these equations with the general-covariant K... |
2210.10388 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev and Vladimir Folomeev | Quantization of measure in gravitation | 10 pages | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | Using the Radon-Nikodym theorem concerning the relation between any two
measures, as well as the methods employed in loop quantum gravity, it is shown
that, in gravitation, one can quantize any measure which is not even associated
with metric. We have considered the simplest case where the proportionality
coefficient... | [
{
"created": "Wed, 19 Oct 2022 08:55:29 GMT",
"version": "v1"
}
] | 2022-10-20 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
]
] | Using the Radon-Nikodym theorem concerning the relation between any two measures, as well as the methods employed in loop quantum gravity, it is shown that, in gravitation, one can quantize any measure which is not even associated with metric. We have considered the simplest case where the proportionality coefficient b... |
gr-qc/9704083 | Rudolf Poppe | Z. Lalak, R. Poppe | Scalar field fluctuations in Pre-Big-Bang Cosmologies | 26 pages, Latex, 6 ps figures | Nucl.Phys. B507 (1997) 419-442 | 10.1016/S0550-3213(97)00588-9 | null | gr-qc hep-th | null | Jordan-Brans-Dicke theories with a linearized potential for the scalar field
are investigated in the framework of the stochastic approach. The fluctuations
of this field are examined and their backreaction on the classical background
is described. We compute the mode functions and analyze the time evolution of
the va... | [
{
"created": "Tue, 29 Apr 1997 23:26:43 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Lalak",
"Z.",
""
],
[
"Poppe",
"R.",
""
]
] | Jordan-Brans-Dicke theories with a linearized potential for the scalar field are investigated in the framework of the stochastic approach. The fluctuations of this field are examined and their backreaction on the classical background is described. We compute the mode functions and analyze the time evolution of the vari... |
2402.06804 | Jose Nijaid Arredondo Mr. | J. Nijaid Arredondo, Antoine Klein, Nicol\'as Yunes | Efficient Gravitational-Wave Model for Fully-Precessing and
Moderately-Eccentric, Compact Binary Inspirals | 22 pages, 9 figures, to be submitted for publication | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Future gravitational-wave detectors, especially the Laser Interferometer
Space Antenna (LISA), will be sensitive to black hole binaries formed in
astrophysical environments that promote large eccentricities and spin
precession. Gravitational-wave templates that include both effects have only
recently begun to be deve... | [
{
"created": "Fri, 9 Feb 2024 22:06:23 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Arredondo",
"J. Nijaid",
""
],
[
"Klein",
"Antoine",
""
],
[
"Yunes",
"Nicolás",
""
]
] | Future gravitational-wave detectors, especially the Laser Interferometer Space Antenna (LISA), will be sensitive to black hole binaries formed in astrophysical environments that promote large eccentricities and spin precession. Gravitational-wave templates that include both effects have only recently begun to be develo... |
1404.3865 | Stephan Reimers | Valeria Diemer (n\'ee Kagramanova), Jutta Kunz, Claus L\"ammerzahl,
Stephan Reimers | Dynamics of test particles in the general five-dimensional Myers-Perry
spacetime | null | Phys. Rev. D 89, 124026 (2014) | 10.1103/PhysRevD.89.124026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the complete set of analytical solutions of the geodesic equation
in the general five-dimensional Myers-Perry spacetime in terms of the
Weierstrass $\wp$-, $\zeta$- and $\sigma$-functions. We analyze the underlying
polynomials in the polar and radial equations, which depend on the parameters
of the metric ... | [
{
"created": "Tue, 15 Apr 2014 10:43:04 GMT",
"version": "v1"
}
] | 2014-07-02 | [
[
"Diemer",
"Valeria",
"",
"née Kagramanova"
],
[
"Kunz",
"Jutta",
""
],
[
"Lämmerzahl",
"Claus",
""
],
[
"Reimers",
"Stephan",
""
]
] | We present the complete set of analytical solutions of the geodesic equation in the general five-dimensional Myers-Perry spacetime in terms of the Weierstrass $\wp$-, $\zeta$- and $\sigma$-functions. We analyze the underlying polynomials in the polar and radial equations, which depend on the parameters of the metric an... |
1804.00772 | Jiacheng Ding | Jia-Cheng Ding, Qi-Qi Fan, Cong Li, Ping Li and Jian-Bo Deng | Apparent horizon and gravitational thermodynamics of Universe in the
Eddington-Born-Infeld theory | 23 pages, 0 figures | Adv.High Energy Phys. 2018 (2018) 7801854 | 10.1155/2018/7801854 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermodynamics of Universe in the Eddington-Born-Infeld (EBI) theory was
restudied by utilizing the holographic-style gravitational equations that
dominate the dynamics of the cosmical apparent horizon $\Upsilon_{A}$ and the
evolution of Universe. We started in rewriting the EBI action of the Palatini
approach in... | [
{
"created": "Tue, 3 Apr 2018 00:52:47 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2018 01:48:44 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Sep 2018 14:57:17 GMT",
"version": "v3"
},
{
"created": "Tue, 1 Jan 2019 09:44:12 GMT",
"version": "v4"
}
] | 2019-01-08 | [
[
"Ding",
"Jia-Cheng",
""
],
[
"Fan",
"Qi-Qi",
""
],
[
"Li",
"Cong",
""
],
[
"Li",
"Ping",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | The thermodynamics of Universe in the Eddington-Born-Infeld (EBI) theory was restudied by utilizing the holographic-style gravitational equations that dominate the dynamics of the cosmical apparent horizon $\Upsilon_{A}$ and the evolution of Universe. We started in rewriting the EBI action of the Palatini approach into... |
1410.3490 | Yvonne Choquet-Bruhat | Yvonne Choquet-Bruhat | Beginnings of the Cauchy problem | 19 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Brief account of results on the Cauchy problem for the Einstein equations
starting with early the works of Darmois and Lichnerowicz and going up to the
proofs of the existence and uniqueness of solutions global in space and local
in time, in Sobolev spaces, for the general equations either in vacuum or with
classical... | [
{
"created": "Mon, 13 Oct 2014 20:02:35 GMT",
"version": "v1"
}
] | 2014-10-15 | [
[
"Choquet-Bruhat",
"Yvonne",
""
]
] | Brief account of results on the Cauchy problem for the Einstein equations starting with early the works of Darmois and Lichnerowicz and going up to the proofs of the existence and uniqueness of solutions global in space and local in time, in Sobolev spaces, for the general equations either in vacuum or with classical s... |
2012.14408 | Maria-Jose Guzman | Alexey Golovnev, Mar\'ia-Jos\'e Guzm\'an | Foundational issues in f(T) gravity theory | 13 pages, no figures, comments welcome; matches the published version | Int. J. Geom. Methods Mod. Phys., Vol. 18, No. supp01, 2140007
(2021) | 10.1142/S0219887821400077 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We give a short review on the status of research on the theoretical
foundations of $f(T)$ gravity theories. We discuss recent results on
perturbative and non-perturbative approaches, causality and degrees of freedom,
and discuss future directions to follow.
| [
{
"created": "Mon, 28 Dec 2020 18:41:59 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Sep 2021 06:02:01 GMT",
"version": "v2"
}
] | 2021-09-15 | [
[
"Golovnev",
"Alexey",
""
],
[
"Guzmán",
"María-José",
""
]
] | We give a short review on the status of research on the theoretical foundations of $f(T)$ gravity theories. We discuss recent results on perturbative and non-perturbative approaches, causality and degrees of freedom, and discuss future directions to follow. |
1310.6916 | Kei Yamamoto | Kei-ichi Maeda and Kei Yamamoto | Stability analysis of inflation with an SU(2) gauge field | Published version | JCAP12(2013)018 | 10.1088/1475-7516/2013/12/018 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study anisotropic cosmologies of a scalar field interacting with an SU(2)
gauge field via a gauge-kinetic coupling. We analyze Bianchi class A models,
which include Bianchi type I, II, VI0, VII0, VIII and IX. The linear stability
of isotropic inflationary solution with background magnetic field is shown,
which gen... | [
{
"created": "Thu, 24 Oct 2013 19:10:19 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Dec 2013 21:28:57 GMT",
"version": "v2"
}
] | 2013-12-17 | [
[
"Maeda",
"Kei-ichi",
""
],
[
"Yamamoto",
"Kei",
""
]
] | We study anisotropic cosmologies of a scalar field interacting with an SU(2) gauge field via a gauge-kinetic coupling. We analyze Bianchi class A models, which include Bianchi type I, II, VI0, VII0, VIII and IX. The linear stability of isotropic inflationary solution with background magnetic field is shown, which gener... |
1407.3697 | Ahmadjon Abdujabbarov | Bobir Toshmatov, Ahmadjon Abdujabbarov, Bobomurat Ahmedov, Zdenek
Stuchl\'ik | Particle motion and collisions around rotating regular black hole | 10 pages, 8 figures, 2 tables | null | 10.1007/s10509-015-2289-4 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutral particle motion around rotating regular black hole that was
derived from the Ay\'{o}n-Beato-Garc\'{i}a black hole solution by the
Newman-Janis algorithm in the preceding paper [Phys. Rev. D 89, 104017, (2014)]
has been studied. The dependencies of the ISCO (innermost stable circular
orbits along geodesics... | [
{
"created": "Mon, 14 Jul 2014 15:31:51 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Toshmatov",
"Bobir",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Stuchlík",
"Zdenek",
""
]
] | The neutral particle motion around rotating regular black hole that was derived from the Ay\'{o}n-Beato-Garc\'{i}a black hole solution by the Newman-Janis algorithm in the preceding paper [Phys. Rev. D 89, 104017, (2014)] has been studied. The dependencies of the ISCO (innermost stable circular orbits along geodesics) ... |
1801.02578 | Vasilis Oikonomou | K. Kleidis, V.K. Oikonomou | Loop Quantum Cosmology Scalar Field Models | IJGMMP accepted | null | 10.1142/S0219887818500718 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we use the Loop Quantum Cosmology modified scalar-tensor
reconstruction techniques in order to investigate how bouncing and inflationary
cosmologies can be realized. With regard to the inflationary cosmologies, we
shall be interested in realizing the intermediate inflation and the Type IV
singular inflat... | [
{
"created": "Mon, 8 Jan 2018 17:38:16 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Kleidis",
"K.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this work we use the Loop Quantum Cosmology modified scalar-tensor reconstruction techniques in order to investigate how bouncing and inflationary cosmologies can be realized. With regard to the inflationary cosmologies, we shall be interested in realizing the intermediate inflation and the Type IV singular inflatio... |
gr-qc/0610005 | Guihua Tian | Zhao Zheng, Tian Guihua and Liu Liao | The Synchronization of Clock Rate and the Equality of Durations Based on
the Poincar\'{e}-Einstein-Landau Conventions | Abstract is rewritten, minor errors are corrected | null | null | null | gr-qc | null | There are two important basic questions in the measurement of time. The first
one is how to define the simultaneity of two events occurring at two different
places. The second one is how to define the equality of two durations. The
first question has been solved by Einstein, Landau and others on the convention
that t... | [
{
"created": "Mon, 2 Oct 2006 03:53:36 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Oct 2006 09:08:29 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Nov 2006 03:18:48 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Zheng",
"Zhao",
""
],
[
"Guihua",
"Tian",
""
],
[
"Liao",
"Liu",
""
]
] | There are two important basic questions in the measurement of time. The first one is how to define the simultaneity of two events occurring at two different places. The second one is how to define the equality of two durations. The first question has been solved by Einstein, Landau and others on the convention that the... |
gr-qc/0508037 | Gaetano Lambiase | Subhendra Mohanty, A.R.Prasanna and G. Lambiase | Leptogenesis from Spin-Gravity Coupling Following Inflation | Journal version (accepted for publication in Phys. Rev. Lett.) | Phys.Rev.Lett. 96 (2006) 071302 | 10.1103/PhysRevLett.96.071302 | null | gr-qc | null | The energy levels of the left and the right handed neutrinos is split in the
background of gravitational waves generated during inflation which in presence
of lepton number violating interactions gives rise to a net lepton asymmetry at
equilibrium. Lepton number violation is achieved by the same dimension five
operat... | [
{
"created": "Wed, 10 Aug 2005 10:36:29 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2006 16:03:58 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Mohanty",
"Subhendra",
""
],
[
"Prasanna",
"A. R.",
""
],
[
"Lambiase",
"G.",
""
]
] | The energy levels of the left and the right handed neutrinos is split in the background of gravitational waves generated during inflation which in presence of lepton number violating interactions gives rise to a net lepton asymmetry at equilibrium. Lepton number violation is achieved by the same dimension five operator... |
2208.10261 | Ernesto Contreras | R. \'Avalos, E. Fuenmayor, E. Contreras | Traversable wormholes with like--Casimir complexity supported with
arbitrarily small amount of exotic matter | null | Eur. Phys. J. C, Eur. Phys. J. C 82, 420 (2022) | 10.1140/epjc/s10052-022-10389-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we construct traversable wormholes geometries in the framework
of the complexity factor. We provide the redshift function of a Casimir
traversable wormhole which, in combination with a non--vanishing complexity
factor, leads to a traversable wormhole with a minimum amount of exotic matter.
The shape func... | [
{
"created": "Thu, 18 Aug 2022 20:11:53 GMT",
"version": "v1"
}
] | 2022-08-31 | [
[
"Ávalos",
"R.",
""
],
[
"Fuenmayor",
"E.",
""
],
[
"Contreras",
"E.",
""
]
] | In this work we construct traversable wormholes geometries in the framework of the complexity factor. We provide the redshift function of a Casimir traversable wormhole which, in combination with a non--vanishing complexity factor, leads to a traversable wormhole with a minimum amount of exotic matter. The shape functi... |
gr-qc/9901036 | Zerbini Sergio | Daniele Binosi and Sergio Zerbini | Quantum scalar field in D-dimensional static black hole space-times | 9 pages, LaTex | J.Math.Phys. 40 (1999) 5106-5116 | 10.1063/1.533018 | null | gr-qc | null | An Euclidean approach for investigating quantum aspects of a scalar field
living on a class of D-dimensional static black hole space-times, including the
extremal ones, is reviewed. The method makes use of a near horizon
approximation of the metric and $\zeta$-function formalism for evaluating the
partition function ... | [
{
"created": "Wed, 13 Jan 1999 13:59:28 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Binosi",
"Daniele",
""
],
[
"Zerbini",
"Sergio",
""
]
] | An Euclidean approach for investigating quantum aspects of a scalar field living on a class of D-dimensional static black hole space-times, including the extremal ones, is reviewed. The method makes use of a near horizon approximation of the metric and $\zeta$-function formalism for evaluating the partition function an... |
1908.09294 | Hoang Nam Cao | Seungjoon Hyun, Cao H. Nam | Charged AdS black holes in Gauss-Bonnet gravity and nonlinear
electrodynamics | 30 pages, 21 figures, version published in EPJC | null | 10.1140/epjc/s10052-019-7248-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New five-dimensional charged AdS black hole solutions are found in
Einstein-Gauss-Bonnet gravity and the nonlinear electrodynamics. These
solutions include regular black holes as well as extremal black holes. The
first law of the black hole thermodynamics is confirmed in the extended phase
space where the cosmologica... | [
{
"created": "Sun, 25 Aug 2019 10:02:35 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"Hyun",
"Seungjoon",
""
],
[
"Nam",
"Cao H.",
""
]
] | New five-dimensional charged AdS black hole solutions are found in Einstein-Gauss-Bonnet gravity and the nonlinear electrodynamics. These solutions include regular black holes as well as extremal black holes. The first law of the black hole thermodynamics is confirmed in the extended phase space where the cosmological ... |
2002.03798 | Nasr Ahmed | Nasr Ahmed and Anirudh Pradhan | Probing $\kappa(R,T)$ cosmology via empirical approach | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a stable flat cosmological model has been constructed and the
evolution of dark energy has been investigated in the framework of the recently
suggested $\kappa(R,T)$ gravity. The empirical approach we adopt in the current
work reveals some interesting cosmological features consistent with
observations ... | [
{
"created": "Wed, 5 Feb 2020 22:11:15 GMT",
"version": "v1"
}
] | 2020-02-11 | [
[
"Ahmed",
"Nasr",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | In this paper, a stable flat cosmological model has been constructed and the evolution of dark energy has been investigated in the framework of the recently suggested $\kappa(R,T)$ gravity. The empirical approach we adopt in the current work reveals some interesting cosmological features consistent with observations an... |
2109.13813 | Zhaoyi Xu | Zhaoyi Xu and Meirong Tang | Rotating spacetime: black-bounces and quantum deformed black hole | 7 pages, 0 figures, Accepted for publication in European Physical
Journal C | null | 10.1140/epjc/s10052-021-09635-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, two kinds of deformed schwarzschild spacetime have been proposed,
which are the black-bounces metric
(\cite{2019JCAP...02..042S,2021PhRvD.103h4052L}) and quantum deformed black
hole (BH) (\cite{2021arXiv210202471B}). In present work, we investigate the
rotating spacetime of these deformed Schwarzschild metr... | [
{
"created": "Tue, 28 Sep 2021 15:39:11 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Xu",
"Zhaoyi",
""
],
[
"Tang",
"Meirong",
""
]
] | Recently, two kinds of deformed schwarzschild spacetime have been proposed, which are the black-bounces metric (\cite{2019JCAP...02..042S,2021PhRvD.103h4052L}) and quantum deformed black hole (BH) (\cite{2021arXiv210202471B}). In present work, we investigate the rotating spacetime of these deformed Schwarzschild metric... |
1909.01998 | Anil Yadav dr | Rajendra Prasad, Lalit Kumar Gupta, and Anil Kumar Yadav | Lyra's cosmology of homogeneous and isotropic universe in Brans-Dicke
theory | 9 pages, 6 Figures, Accepted for Publication in Int. J. Geom. Meth.
Mod. Phys | International Journal of Geometric Methods in Modern Physics 18,
2150029 (2021) | 10.1142/S0219887821500298 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate a scalar field Brans-Dicke cosmological model
in Lyra's geometry which is based on the modifications in geometrical term as
well as energy term of Einstein's field equations. We have examined the
validity of proposed cosmological model on observational scale by performing
statistical ana... | [
{
"created": "Wed, 4 Sep 2019 16:48:37 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2019 16:33:23 GMT",
"version": "v2"
},
{
"created": "Thu, 7 May 2020 15:02:12 GMT",
"version": "v3"
},
{
"created": "Mon, 23 Nov 2020 12:14:42 GMT",
"version": "v4"
}
] | 2023-11-15 | [
[
"Prasad",
"Rajendra",
""
],
[
"Gupta",
"Lalit Kumar",
""
],
[
"Yadav",
"Anil Kumar",
""
]
] | In this paper, we investigate a scalar field Brans-Dicke cosmological model in Lyra's geometry which is based on the modifications in geometrical term as well as energy term of Einstein's field equations. We have examined the validity of proposed cosmological model on observational scale by performing statistical analy... |
0810.3593 | Gonzalo Olmo | Gonzalo J. Olmo | Re-examination of Polytropic Spheres in Palatini f(R) Gravity | null | Phys.Rev.D78:104026,2008 | 10.1103/PhysRevD.78.104026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate spherically symmetric, static matter configurations with
polytropic equation of state for a class of f(R) models in Palatini formalism
and show that the surface singularities recently reported in the literature are
not physical in the case of Planck scale modified lagrangians. In such cases,
they are j... | [
{
"created": "Mon, 20 Oct 2008 16:04:58 GMT",
"version": "v1"
}
] | 2009-02-23 | [
[
"Olmo",
"Gonzalo J.",
""
]
] | We investigate spherically symmetric, static matter configurations with polytropic equation of state for a class of f(R) models in Palatini formalism and show that the surface singularities recently reported in the literature are not physical in the case of Planck scale modified lagrangians. In such cases, they are jus... |
1008.0613 | Michael Hohensee | Holger Mueller and Michael A. Hohensee and Nan Yu | Matter-wave Tests of the Gravitational Redshift in Space | Talk given at the Fifth Meeting on CPT and Lorentz Symmetry, at
Indiana University, Bloomington, IN. Corrected problem with Figure | null | 10.1142/9789814327688_0002 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent measurement of the gravitational redshift was based on interference
of matter waves. Operation in microgravity can improve it by a factor of $10^5$
and, in some models, even $10^{10}$.
| [
{
"created": "Tue, 3 Aug 2010 18:18:18 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2010 11:16:23 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Mueller",
"Holger",
""
],
[
"Hohensee",
"Michael A.",
""
],
[
"Yu",
"Nan",
""
]
] | A recent measurement of the gravitational redshift was based on interference of matter waves. Operation in microgravity can improve it by a factor of $10^5$ and, in some models, even $10^{10}$. |
gr-qc/9806049 | Hongwei Yu | Hongwei Yu | Averaged Energy Conditions in 4D Evaporating Black Hole Backgrounds | Revtex, 13 pages, to appear in Phy. Rev. D | Phys.Rev. D58 (1998) 064017 | 10.1103/PhysRevD.58.064017 | null | gr-qc | null | Using Visser's semi-analytical model for the stress-energy tensor
corresponding to the conformally coupled massless scalar field in the Unruh
vacuum, we examine, by explicitly evaluating the relevant integrals over
half-complete geodesics, the averaged weak (AWEC) and averaged null (ANEC)
energy conditions along with... | [
{
"created": "Tue, 9 Jun 1998 22:39:01 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Yu",
"Hongwei",
""
]
] | Using Visser's semi-analytical model for the stress-energy tensor corresponding to the conformally coupled massless scalar field in the Unruh vacuum, we examine, by explicitly evaluating the relevant integrals over half-complete geodesics, the averaged weak (AWEC) and averaged null (ANEC) energy conditions along with F... |
2312.15552 | Emmanuil Saridakis | E. Kapsabelis, Emmanuel N. Saridakis, P. C. Stavrinos | Finsler-Randers-Sasaki gravity and cosmology | 14 pages, 1 figure, version published in Eur.Phys.J.C | Eur. Phys. J. C 84, 538 (2024) | 10.1140/epjc/s10052-024-12924-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present for the first time a Friedmann-like construction in the framework
of an osculating Finsler-Randers-Sasaki geometry. In particular, we consider a
vector field in the metric on a Lorentz tangent bundle, and thus the curvatures
of horizontal and vertical spaces, as well as the extra contributions of
torsion a... | [
{
"created": "Sun, 24 Dec 2023 21:48:22 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Jun 2024 07:19:20 GMT",
"version": "v2"
}
] | 2024-06-04 | [
[
"Kapsabelis",
"E.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Stavrinos",
"P. C.",
""
]
] | We present for the first time a Friedmann-like construction in the framework of an osculating Finsler-Randers-Sasaki geometry. In particular, we consider a vector field in the metric on a Lorentz tangent bundle, and thus the curvatures of horizontal and vertical spaces, as well as the extra contributions of torsion and... |
1301.3691 | Marcello Ortaggio | Sigbj{\o}rn Hervik, Marcello Ortaggio, Lode Wylleman | Electric and magnetic Weyl tensors in higher dimensions | 4 pages; short summary of (parts of) arXiv:1203.3563. Proceedings of
"Relativity and Gravitation - 100 Years after Einstein in Prague", Prague,
June 25-29, 2012 (http://ae100prg.mff.cuni.cz/) | Springer Proc.Phys. 157 (2014) 287-290 | 10.1007/978-3-319-06761-2_38 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent results on purely electric (PE) or magnetic (PM) spacetimes in n
dimensions are summarized. These include: Weyl types; diagonalizability;
conditions under which direct (or warped) products are PE/PM.
| [
{
"created": "Wed, 16 Jan 2013 13:56:47 GMT",
"version": "v1"
}
] | 2014-11-14 | [
[
"Hervik",
"Sigbjørn",
""
],
[
"Ortaggio",
"Marcello",
""
],
[
"Wylleman",
"Lode",
""
]
] | Recent results on purely electric (PE) or magnetic (PM) spacetimes in n dimensions are summarized. These include: Weyl types; diagonalizability; conditions under which direct (or warped) products are PE/PM. |
1912.12805 | Kouji Nakamura | Kouji Nakamura | Second-order Gauge-invariant Cosmological Perturbation Theory: Current
Status updated in 2019 | 40 pages, 2 figures, to be published as a book chapter in "Theory and
Applications of Physical Science" from Book Publisher International; arXiv
admin note: text overlap with arXiv:gr-qc/0605108, arXiv:1001.2621; (v2) a
reference is corrected | Chapter 1 in "Theory and Applications of Physical Science vol.3"
(Book Publisher International, 2020) | 10.9734/bpi/taps/v3 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current status of the recent developments of the second-order
gauge-invariant cosmological perturbation theory is reviewed. To show the
essence of this perturbation theory, we concentrate only on the universe filled
with a single scalar field. Through this review, we point out the problems
which should be clarifi... | [
{
"created": "Mon, 30 Dec 2019 04:09:20 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2020 02:37:46 GMT",
"version": "v2"
}
] | 2020-02-05 | [
[
"Nakamura",
"Kouji",
""
]
] | The current status of the recent developments of the second-order gauge-invariant cosmological perturbation theory is reviewed. To show the essence of this perturbation theory, we concentrate only on the universe filled with a single scalar field. Through this review, we point out the problems which should be clarified... |
gr-qc/9810007 | Dmitriy Yu. Shabalkin | Victor M. Zhuravlev, Serguey V. Chervon and Dmitriy Yu. Shabalkin | Effective chiral model of a plane-symmetric gravitational field:
properties and exact solutions | 5 pages, LaTex | Grav.Cosmol. 4 (1997) 312-316 | null | null | gr-qc | null | An effective chiral model of a plane-symmetric gravitational field is
considered. Isometries of the target space of the model are described and exact
solutions corresponding to the isometric ansatz method are obtained. New exact
solutions are found using the method of functional parameters. The solutions
obtained are... | [
{
"created": "Fri, 2 Oct 1998 12:01:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhuravlev",
"Victor M.",
""
],
[
"Chervon",
"Serguey V.",
""
],
[
"Shabalkin",
"Dmitriy Yu.",
""
]
] | An effective chiral model of a plane-symmetric gravitational field is considered. Isometries of the target space of the model are described and exact solutions corresponding to the isometric ansatz method are obtained. New exact solutions are found using the method of functional parameters. The solutions obtained are B... |
gr-qc/0103016 | Andreas Gross | Andreas Gross and Guillermo F. Rubilar | On the derivation of the spacetime metric from linear electrodynamics | 11 Pages, LaTeX, some typos corrected, one reference added. Version
published in Physics Letters A | Phys.Lett. A285 (2001) 267-272 | 10.1016/S0375-9601(01)00354-1 | null | gr-qc | null | In the framework of metric-free electrodynamics, we start with a {\em linear}
spacetime relation between the excitation 2-form $H = ({\cal D}, {\cal H})$ and
the field strength 2-form $F = ({E,B})$. This linear relation is constrained by
the so-called closure relation. We solve this system algebraically and extend a
... | [
{
"created": "Tue, 6 Mar 2001 15:36:14 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jul 2001 10:45:09 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Gross",
"Andreas",
""
],
[
"Rubilar",
"Guillermo F.",
""
]
] | In the framework of metric-free electrodynamics, we start with a {\em linear} spacetime relation between the excitation 2-form $H = ({\cal D}, {\cal H})$ and the field strength 2-form $F = ({E,B})$. This linear relation is constrained by the so-called closure relation. We solve this system algebraically and extend a pr... |
2012.06485 | Joel Berg\'e | Joel Berg\'e, Quentin Baghi, Alain Robert, Manuel Rodrigues, Bernard
Foulon, Emilie Hardy, Gilles M\'etris, Sandrine Pires, Pierre Touboul | MICROSCOPE mission: Statistics and impact of glitches on the test of the
weak equivalence principle | References updated | null | null | null | gr-qc astro-ph.IM physics.space-ph | http://creativecommons.org/licenses/by/4.0/ | MICROSCOPE's space test of the weak equivalence principle (WEP) is based on
the minute measurement of the difference of accelerations experienced by two
test masses as they orbit the Earth. A detection of a violation of the WEP
would appear at a well-known frequency $f_{\rm EP}$ depending on the
satellite's orbital a... | [
{
"created": "Fri, 11 Dec 2020 16:50:32 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Dec 2020 12:45:27 GMT",
"version": "v2"
}
] | 2020-12-23 | [
[
"Bergé",
"Joel",
""
],
[
"Baghi",
"Quentin",
""
],
[
"Robert",
"Alain",
""
],
[
"Rodrigues",
"Manuel",
""
],
[
"Foulon",
"Bernard",
""
],
[
"Hardy",
"Emilie",
""
],
[
"Métris",
"Gilles",
""
],
[
"Pi... | MICROSCOPE's space test of the weak equivalence principle (WEP) is based on the minute measurement of the difference of accelerations experienced by two test masses as they orbit the Earth. A detection of a violation of the WEP would appear at a well-known frequency $f_{\rm EP}$ depending on the satellite's orbital and... |
1902.05742 | Elena P. Savelova Dr. | A.A. Kirillov E.P. Savelova | Wormhole as a possible accelerator of high-energy cosmic-ray particles | 8 pages, twocolumn, refs added, some misprints removed | Eur. Phys. J. C 80, 45 (2020) | 10.1140/epjc/s10052-020-7609-3 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the simplest topological classification of wormholes and
demonstrate that in open Friedmann models the genus $n\geq 1$ wormholes are
stable and do not require the presence of exotic forms of matter, or any
modification of general relativity. We show that such wormholes may also
possess magnetic fields. It ... | [
{
"created": "Fri, 15 Feb 2019 09:47:18 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Oct 2019 13:42:34 GMT",
"version": "v2"
}
] | 2020-07-09 | [
[
"Savelova",
"A. A. Kirillov E. P.",
""
]
] | We present the simplest topological classification of wormholes and demonstrate that in open Friedmann models the genus $n\geq 1$ wormholes are stable and do not require the presence of exotic forms of matter, or any modification of general relativity. We show that such wormholes may also possess magnetic fields. It is... |
1504.05189 | Massimiliano Rinaldi | Adolfo Cisterna, T\'erence Delsate, and Massimiliano Rinaldi | Neutron stars in general second order scalar-tensor theory: the case of
non-minimal derivative coupling | References added, typos fixed. Title changed upon editor request. To
appear in Physical Review D | Phys. Rev. D 92, 044050 (2015) | 10.1103/PhysRevD.92.044050 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the sector of Horndeski's gravity characterized by the coupling
between the kinetic scalar field term and the Einstein tensor. We numerically
construct neutron star configurations where the external geometry is identical
to the Schwarzschild metric but the interior structure is considerably
different from... | [
{
"created": "Mon, 20 Apr 2015 20:00:42 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2015 12:35:02 GMT",
"version": "v2"
}
] | 2015-09-02 | [
[
"Cisterna",
"Adolfo",
""
],
[
"Delsate",
"Térence",
""
],
[
"Rinaldi",
"Massimiliano",
""
]
] | We consider the sector of Horndeski's gravity characterized by the coupling between the kinetic scalar field term and the Einstein tensor. We numerically construct neutron star configurations where the external geometry is identical to the Schwarzschild metric but the interior structure is considerably different from s... |
2007.14217 | PierGianLuca Porta Mana | P.G.L. Porta Mana | Dimensional analysis in relativity and in differential geometry | 39 pages. V7: Corrected typos and discussion of 4-velocity | null | 10.1088/1361-6404/aba90b | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This note provides a short guide to dimensional analysis in Lorentzian and
general relativity and in differential geometry. It tries to revive Dorgelo and
Schouten's notion of 'intrinsic' or 'absolute' dimension of a tensorial
quantity. The intrinsic dimension is independent of the dimensions of the
coordinates and e... | [
{
"created": "Mon, 27 Jul 2020 17:05:34 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2020 14:07:10 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Nov 2020 08:20:29 GMT",
"version": "v3"
},
{
"created": "Thu, 20 May 2021 11:44:29 GMT",
"version": "v4"
},
{
"c... | 2023-05-09 | [
[
"Mana",
"P. G. L. Porta",
""
]
] | This note provides a short guide to dimensional analysis in Lorentzian and general relativity and in differential geometry. It tries to revive Dorgelo and Schouten's notion of 'intrinsic' or 'absolute' dimension of a tensorial quantity. The intrinsic dimension is independent of the dimensions of the coordinates and exp... |
1412.0992 | \.Ibrahim Semiz | \.Ibrahim Semiz and A. Kaz{\i}m \c{C}aml{\i}bel | Jovian planets as co-detectors of gravitational waves | 5 plain LaTeX pages, no figures | null | null | null | gr-qc astro-ph.EP astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Acoustic oscillations in stars can be driven by gravitational waves. However,
at present it is not feasible to use the helioseismology data for their
detection, since it is impossible to disentangle the uncertain driving
contributions originating in the Sun itself.
We here point out that any such wave will affect a... | [
{
"created": "Tue, 2 Dec 2014 17:34:17 GMT",
"version": "v1"
}
] | 2014-12-03 | [
[
"Semiz",
"İbrahim",
""
],
[
"Çamlıbel",
"A. Kazım",
""
]
] | Acoustic oscillations in stars can be driven by gravitational waves. However, at present it is not feasible to use the helioseismology data for their detection, since it is impossible to disentangle the uncertain driving contributions originating in the Sun itself. We here point out that any such wave will affect also ... |
2311.17557 | Yongqiang Wang | Xin Su, Chen-Hao Hao, Ji-Rong Ren, Yong-Qiang Wang | Building a black hole-wormhole-black hole combination | 32 pages, 19 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present the spherically symmetric Proca star in the
presence of a phantom field and obtain a traversable wormhole solution for
non-trivial topological spacetime. Using numerical methods, symmetric solutions
and asymmetric solutions are obtained in two asymptotically flat regions. We
find that when c... | [
{
"created": "Wed, 29 Nov 2023 11:39:43 GMT",
"version": "v1"
}
] | 2023-11-30 | [
[
"Su",
"Xin",
""
],
[
"Hao",
"Chen-Hao",
""
],
[
"Ren",
"Ji-Rong",
""
],
[
"Wang",
"Yong-Qiang",
""
]
] | In this paper, we present the spherically symmetric Proca star in the presence of a phantom field and obtain a traversable wormhole solution for non-trivial topological spacetime. Using numerical methods, symmetric solutions and asymmetric solutions are obtained in two asymptotically flat regions. We find that when cha... |
gr-qc/9903024 | Slava G. Turyshev | Slava G. Turyshev, John D. Anderson, Philip A. Laing, Eunice L. Lau,
Anthony S. Liu, and Michael Martin Nieto | The Apparent Anomalous, Weak, Long-Range Acceleration of Pioneer 10 and
11 | Latex, 7 pages and 2 figures. Invited talk at the XXXIV-th Rencontres
de Moriond Meeting on Gravitational Waves and Experimental Gravity. Les Arcs,
Savoi, France (January 23-30,1999). Corrected typos | "Gravitational Waves and Experimental Gravity", (2000) 481-486 | null | LANL report # LA-UR-99-890 | gr-qc astro-ph | null | Recently we reported that radio Doppler data generated by NASA's Deep Space
Network (DSN) from the Pioneer 10 and 11 spacecraft indicate an apparent
anomalous, constant, spacecraft acceleration with a magnitude $\sim 8.5\times
10^{-8}$ cm s$^{-2}$, directed towards the Sun (gr-qc/9808081). Analysis of
similar Doppler... | [
{
"created": "Sat, 6 Mar 1999 00:26:33 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Mar 1999 00:45:14 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Anderson",
"John D.",
""
],
[
"Laing",
"Philip A.",
""
],
[
"Lau",
"Eunice L.",
""
],
[
"Liu",
"Anthony S.",
""
],
[
"Nieto",
"Michael Martin",
""
]
] | Recently we reported that radio Doppler data generated by NASA's Deep Space Network (DSN) from the Pioneer 10 and 11 spacecraft indicate an apparent anomalous, constant, spacecraft acceleration with a magnitude $\sim 8.5\times 10^{-8}$ cm s$^{-2}$, directed towards the Sun (gr-qc/9808081). Analysis of similar Doppler a... |
2404.02818 | Job Furtado Neto | M. H. Mac\^edo, J. Furtado, G. Alencar, R. R. Landim | Thermodynamics and Quasinormal Modes of the Dymnikova Black Hole in
Higher Dimensions | Two columns, 8 pages, 4 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this study, we investigate the thermodynamic properties and quasinormal
modes of Dymnikova black holes within the context of higher dimensions in
Einstein's general theory of relativity. We calculate the thermodynamic
parameters, including the Hawking temperature and heat capacity, which allowed
us to investigate ... | [
{
"created": "Wed, 3 Apr 2024 15:39:13 GMT",
"version": "v1"
}
] | 2024-04-04 | [
[
"Macêdo",
"M. H.",
""
],
[
"Furtado",
"J.",
""
],
[
"Alencar",
"G.",
""
],
[
"Landim",
"R. R.",
""
]
] | In this study, we investigate the thermodynamic properties and quasinormal modes of Dymnikova black holes within the context of higher dimensions in Einstein's general theory of relativity. We calculate the thermodynamic parameters, including the Hawking temperature and heat capacity, which allowed us to investigate th... |
0805.0666 | Giles Martin | Giles D. R. Martin | Classical and Quantum Radiation Reaction | PhD Thesis, 239 pages | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis reports on work undertaken in comparing the effects of the
phenomenon of radiation reaction in classical and quantum theories of
electrodynamics. Specifically, it is concerned with the prediction of the
change in position of a particle due to the inclusion of the self-force in the
theory. We calculate thi... | [
{
"created": "Tue, 6 May 2008 08:14:34 GMT",
"version": "v1"
}
] | 2008-06-05 | [
[
"Martin",
"Giles D. R.",
""
]
] | This thesis reports on work undertaken in comparing the effects of the phenomenon of radiation reaction in classical and quantum theories of electrodynamics. Specifically, it is concerned with the prediction of the change in position of a particle due to the inclusion of the self-force in the theory. We calculate this ... |
2312.13354 | Shahar Hod | Shahar Hod | The superradiant instability spectrum of the hydrodynamic vortex model | 8 pages | Physical Review D 108, 124033 (2023) | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We study analytically the superradiant instability properties of the
hydrodynamic vortex model, an asymptotically flat acoustic geometry which, like
the spinning Kerr black-hole spacetime, possesses an effective ergoregion. In
particular, we derive a compact analytical formula for the complex resonant
frequencies tha... | [
{
"created": "Wed, 20 Dec 2023 19:00:02 GMT",
"version": "v1"
}
] | 2024-01-03 | [
[
"Hod",
"Shahar",
""
]
] | We study analytically the superradiant instability properties of the hydrodynamic vortex model, an asymptotically flat acoustic geometry which, like the spinning Kerr black-hole spacetime, possesses an effective ergoregion. In particular, we derive a compact analytical formula for the complex resonant frequencies that ... |
1011.1885 | Leo Brewin | Leo Brewin | Fast algorithms for computing defects and their derivatives in the Regge
calculus | 38 pages, 10 figures | Class.Quant.Grav.28:185005,2011 | 10.1088/0264-9381/28/18/185005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Any practical attempt to solve the Regge equations, these being a large
system of non-linear algebraic equations, will almost certainly employ a
Newton-Raphson like scheme. In such cases it is essential that efficient
algorithms be used when computing the defect angles and their derivatives with
respect to the leg-le... | [
{
"created": "Mon, 8 Nov 2010 19:56:05 GMT",
"version": "v1"
}
] | 2011-09-08 | [
[
"Brewin",
"Leo",
""
]
] | Any practical attempt to solve the Regge equations, these being a large system of non-linear algebraic equations, will almost certainly employ a Newton-Raphson like scheme. In such cases it is essential that efficient algorithms be used when computing the defect angles and their derivatives with respect to the leg-leng... |
1206.0879 | Elias C. Vagenas | Adamantia Zampeli, Douglas Singleton, Elias C. Vagenas | Hawking radiation, chirality, and the principle of effective theory of
gravity | 13 pages, LaTeX, no figures, to appear in JHEP; v2: two references
added and various cosmetic (but no physics) changes to match published
version | JHEP 1206:097, 2012 | 10.1007/JHEP06(2012)097 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we combine the chirality of field theories in near horizon
regions with the principle of effective theory of gravity to define a new
energy-momentum tensor for the theory. This new energy-momentum tensor has the
correct radiation flux to account for Hawking radiation for space-times with
horizons. This ... | [
{
"created": "Tue, 5 Jun 2012 11:05:43 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2012 09:51:57 GMT",
"version": "v2"
}
] | 2012-07-17 | [
[
"Zampeli",
"Adamantia",
""
],
[
"Singleton",
"Douglas",
""
],
[
"Vagenas",
"Elias C.",
""
]
] | In this paper we combine the chirality of field theories in near horizon regions with the principle of effective theory of gravity to define a new energy-momentum tensor for the theory. This new energy-momentum tensor has the correct radiation flux to account for Hawking radiation for space-times with horizons. This me... |
gr-qc/0401086 | Giovanni Imponente | Giovanni Imponente and Giovanni Montani | Bianchi IX Chaoticity: BKL Map and Continuous Flow | 4 pages, no figures, proceedings of Frontier Science 2003, to appear
on Physica A | Physica A338 (2004) 282-285 | 10.1016/j.physa.2004.02.053 | null | gr-qc nlin.CD | null | We analyze the Bianchi IX dynamics (Mixmaster) in view of its stochastic
properties; in the present paper we address either the original approach due to
Belinski, Khalatnikov and Lifshitz (BKL) as well as a Hamiltonian one relying
on the Arnowitt--Deser--Misner (ADM) reduction. We compare these two frameworks
and sho... | [
{
"created": "Tue, 20 Jan 2004 16:32:14 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Imponente",
"Giovanni",
""
],
[
"Montani",
"Giovanni",
""
]
] | We analyze the Bianchi IX dynamics (Mixmaster) in view of its stochastic properties; in the present paper we address either the original approach due to Belinski, Khalatnikov and Lifshitz (BKL) as well as a Hamiltonian one relying on the Arnowitt--Deser--Misner (ADM) reduction. We compare these two frameworks and show ... |
2008.02136 | Nikodem Poplawski | Nikodem Pop{\l}awski | Gravitational collapse of a fluid with torsion into a universe in a
black hole | 6 pages. arXiv admin note: substantial text overlap with
arXiv:2007.11556 | Zh. Eksp. Teor. Fiz. 159, 448 (2021); J. Exp. Theor. Phys. 132,
374 (2021) | 10.31857/S0044451021030068 10.1134/S1063776121030092 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider gravitational collapse of a spherically symmetric sphere of a
fluid with spin and torsion into a black hole. We use the Tolman metric and the
Einstein--Cartan field equations with a relativistic spin fluid as a source. We
show that gravitational repulsion of torsion prevents a singularity and
replaces it ... | [
{
"created": "Tue, 4 Aug 2020 17:02:13 GMT",
"version": "v1"
}
] | 2023-03-20 | [
[
"Popławski",
"Nikodem",
""
]
] | We consider gravitational collapse of a spherically symmetric sphere of a fluid with spin and torsion into a black hole. We use the Tolman metric and the Einstein--Cartan field equations with a relativistic spin fluid as a source. We show that gravitational repulsion of torsion prevents a singularity and replaces it wi... |
1506.02760 | Kazuharu Bamba | Kazuharu Bamba and Katsutaro Shimizu | Construction of energy-momentum tensor of gravitation | 13 pages, no figure, version accepted for publication in
International Journal of Geometric Methods in Modern Physics | null | 10.1142/S0219887816500018 | FU-PCG-05 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the gravitational energy-momentum tensor in general relativity
through the Noether theorem. In particular, we explicitly demonstrate that the
constructed quantity can vary as a tensor under the general coordinate
transformation. Furthermore, we verify that the energy-momentum conservation is
satisfied be... | [
{
"created": "Tue, 9 Jun 2015 03:06:36 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Sep 2015 12:27:37 GMT",
"version": "v2"
}
] | 2016-01-20 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Shimizu",
"Katsutaro",
""
]
] | We construct the gravitational energy-momentum tensor in general relativity through the Noether theorem. In particular, we explicitly demonstrate that the constructed quantity can vary as a tensor under the general coordinate transformation. Furthermore, we verify that the energy-momentum conservation is satisfied beca... |
1506.06982 | Wu-Sheng Dai | Yu-Zhu Chen, Wen-Du Li, and Wu-Sheng Dai | Thermo field dynamics approach for entropy of spacetime | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A thermo field dynamics approach for calculating the entropy of a spacetime
is suggested. It is exemplified through the Rindler spacetime, the Milne
spacetime, the Boulware spacetime, and the Minkowski spacetime with a moving
mirror that the entropy of a spacetime is equal to the entropy of a thermo
quantum field wit... | [
{
"created": "Tue, 23 Jun 2015 13:28:33 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jul 2015 15:41:11 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Jul 2015 14:36:09 GMT",
"version": "v3"
},
{
"created": "Tue, 8 Sep 2015 14:22:33 GMT",
"version": "v4"
},
{
"crea... | 2015-11-03 | [
[
"Chen",
"Yu-Zhu",
""
],
[
"Li",
"Wen-Du",
""
],
[
"Dai",
"Wu-Sheng",
""
]
] | A thermo field dynamics approach for calculating the entropy of a spacetime is suggested. It is exemplified through the Rindler spacetime, the Milne spacetime, the Boulware spacetime, and the Minkowski spacetime with a moving mirror that the entropy of a spacetime is equal to the entropy of a thermo quantum field with ... |
0810.4385 | Yun Soo Myung | Yun Soo Myung | On phantom thermodynamics with negative temperature | 8 pages, 1figure, title changed, version to appear in PLB | Phys.Lett.B671:216-218,2009 | 10.1016/j.physletb.2008.12.011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the thermodynamic properties of the Friedmann-Robertson-Walker
universe with dark energy fluids labelled by $\omega=p/\rho<-1/3$. Using the
integrability condition, we show that the phantom phase of $w<-1$ can still be
thermodynamically allowed even when the temperature takes on negative values
because in ... | [
{
"created": "Fri, 24 Oct 2008 06:17:19 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Dec 2008 23:49:14 GMT",
"version": "v2"
}
] | 2009-01-14 | [
[
"Myung",
"Yun Soo",
""
]
] | We discuss the thermodynamic properties of the Friedmann-Robertson-Walker universe with dark energy fluids labelled by $\omega=p/\rho<-1/3$. Using the integrability condition, we show that the phantom phase of $w<-1$ can still be thermodynamically allowed even when the temperature takes on negative values because in th... |
gr-qc/9503055 | J. Anandan | Jeeva Anandan | REMARKS CONCERNING THE GEOMETRIES OF GRAVITY AND GAUGE FIELDS | 11 pages, tex, 1 figure which may be obtained from the author by
sending him an e-mail to jeeva@thphys.ox.ac.uk or a snail-mail to his present
address at the Dept. of Theoretical Physics, University of Oxford, 1 Keble
Road, Oxford OX1 3NP, England. | null | null | null | gr-qc | null | An important limitation is shown in the analogy between the Aharonov-Bohm
effect and the parallel transport on a cone. It illustrates a basic difference
between gravity and gauge fields due to the existence of the solder form for
the space-time geometry. This difference is further shown by the observability
of the gr... | [
{
"created": "Wed, 29 Mar 1995 12:02:19 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Anandan",
"Jeeva",
""
]
] | An important limitation is shown in the analogy between the Aharonov-Bohm effect and the parallel transport on a cone. It illustrates a basic difference between gravity and gauge fields due to the existence of the solder form for the space-time geometry. This difference is further shown by the observability of the grav... |
gr-qc/0111078 | Rainer Burghardt | Rainer Burghardt | New embedding of Schwarzschild geometry. I. Exterior solution | 12 pages | null | null | Arg-2001-1 | gr-qc | null | We propose a global minimal embedding of the Schwarzschild theory in a
five-dimensional flat space by using two surfaces. Covariant field equations
are deduced for the gravitational forces.
| [
{
"created": "Thu, 22 Nov 2001 17:15:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burghardt",
"Rainer",
""
]
] | We propose a global minimal embedding of the Schwarzschild theory in a five-dimensional flat space by using two surfaces. Covariant field equations are deduced for the gravitational forces. |
0912.4669 | Yosef Verbin | Y. Brihaye and Y. Verbin | Cylindrically-Symmetric Solutions in Conformal Gravity | 22 pages, revised version, accepted for publication in Phys. Rev. D | Phys.Rev.D81:124022,2010 | 10.1103/PhysRevD.81.124022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cylindrically-symmetric solutions in Conformal Gravity are investigated and
several new solutions are presented and discussed. Among them, a family of
vacuum solutions, generalizations of the Melvin solution and cosmic strings of
the Abelian Higgs model. The Melvin-like solutions have finite energy per unit
length, w... | [
{
"created": "Wed, 23 Dec 2009 15:44:16 GMT",
"version": "v1"
},
{
"created": "Thu, 27 May 2010 14:26:55 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Brihaye",
"Y.",
""
],
[
"Verbin",
"Y.",
""
]
] | Cylindrically-symmetric solutions in Conformal Gravity are investigated and several new solutions are presented and discussed. Among them, a family of vacuum solutions, generalizations of the Melvin solution and cosmic strings of the Abelian Higgs model. The Melvin-like solutions have finite energy per unit length, whi... |
1304.7360 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov, V. D. Vertogradov | Geodesics with negative energy in the ergosphere of rotating black holes | 9 pages, no figures, published version | Modern Physics Letters A 29 (2014) 1450110 | 10.1142/S0217732314501107 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the geodesics with negative energy for rotating black holes
cannot originate or terminate inside the ergosphere. Their length is always
finite and this leads to conclusion that they must originate and terminate
inside the gravitational radius of the ergosphere.
| [
{
"created": "Sat, 27 Apr 2013 11:53:35 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Nov 2014 23:20:09 GMT",
"version": "v2"
}
] | 2014-11-05 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
],
[
"Vertogradov",
"V. D.",
""
]
] | It is shown that the geodesics with negative energy for rotating black holes cannot originate or terminate inside the ergosphere. Their length is always finite and this leads to conclusion that they must originate and terminate inside the gravitational radius of the ergosphere. |
1907.05551 | Alexander Zhidenko | R. A. Konoplya and A. Zhidenko | Analytical representation for metrics of scalarized Einstein-Maxwell
black holes and their shadows | 8 pages, 3 figures, ancillary Mathematica package and 2 notebooks | Phys. Rev. D 100, 044015 (2019) | 10.1103/PhysRevD.100.044015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we construct approximate analytical forms for the metric coefficients
and fields representing the scalarized Einstein-Maxwell black holes with
various couplings of the scalar field, once the parameters of the system are
fixed. By increasing approximation order, one can obtain the analytic
representation with any... | [
{
"created": "Fri, 12 Jul 2019 02:23:01 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2019 19:38:05 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Aug 2019 00:24:50 GMT",
"version": "v3"
}
] | 2019-08-12 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | Here we construct approximate analytical forms for the metric coefficients and fields representing the scalarized Einstein-Maxwell black holes with various couplings of the scalar field, once the parameters of the system are fixed. By increasing approximation order, one can obtain the analytic representation with any d... |
gr-qc/0610145 | M. Haghighat | M. Haghighat and F. Loran | Bound State of an Electron on a $^4$He Superfluid Droplet as a Test for
Quantum Gravity | 5 pages, 2 figures | null | null | null | gr-qc | null | We address the problem of finding a system in which there would be measurable
quantum gravitational effects. Following standard quantum-field methods, we
have calculated the first-order radiative correction of graviton exchange on
the binding energy of an electron with an ultra cold superfluid droplet of
$^4$He with ... | [
{
"created": "Sat, 28 Oct 2006 10:39:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Haghighat",
"M.",
""
],
[
"Loran",
"F.",
""
]
] | We address the problem of finding a system in which there would be measurable quantum gravitational effects. Following standard quantum-field methods, we have calculated the first-order radiative correction of graviton exchange on the binding energy of an electron with an ultra cold superfluid droplet of $^4$He with ma... |
gr-qc/0509090 | Miguel D. Bustamante | Miguel D. Bustamante, Fabrice Debbasch, Marc-Etienne Brachet | Classical Gravitation as free Membrane Dynamics | Fully revised version, 12 pages, 2 figures, revtex4 | null | null | null | gr-qc hep-th | null | The formulation of General Relativity in which the 4-dimensional space-time
is embedded in a flat host space of higher dimension is reconsidered. New
classes of embeddings (modeled after Nash's classical free embeddings) are
introduced. They present the important advantage of being deformable and
therefore physically... | [
{
"created": "Thu, 22 Sep 2005 12:12:10 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Oct 2005 10:27:02 GMT",
"version": "v2"
},
{
"created": "Sun, 24 Dec 2006 04:31:10 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Bustamante",
"Miguel D.",
""
],
[
"Debbasch",
"Fabrice",
""
],
[
"Brachet",
"Marc-Etienne",
""
]
] | The formulation of General Relativity in which the 4-dimensional space-time is embedded in a flat host space of higher dimension is reconsidered. New classes of embeddings (modeled after Nash's classical free embeddings) are introduced. They present the important advantage of being deformable and therefore physically r... |
1509.07536 | Vedad Pasic Dr | Vedad Pasic, Elvis Barakovic | Torsion Wave Solutions in Yang-Mielke Theory of Gravity | null | Advances in High Energy Physics, vol. 2015, Article ID 239076, 7
pages, 2015 | 10.1155/2015/239076 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The approach of metric-affine gravity initially distinguishes it from
Einstein's general relativity. Using an independent affine connection produces
a theory with 10+64 unknowns. We write down the Yang-Mills action for the
affine connection and produce the Yang-Mills equation and the so called
complementary Yang-Mill... | [
{
"created": "Thu, 24 Sep 2015 21:00:56 GMT",
"version": "v1"
}
] | 2015-09-28 | [
[
"Pasic",
"Vedad",
""
],
[
"Barakovic",
"Elvis",
""
]
] | The approach of metric-affine gravity initially distinguishes it from Einstein's general relativity. Using an independent affine connection produces a theory with 10+64 unknowns. We write down the Yang-Mills action for the affine connection and produce the Yang-Mills equation and the so called complementary Yang-Mills ... |
2401.08413 | Farook Rahaman | Nayan Sarkar, Susmita Sarkar, Banashree Sen Moumita Sarkar and Farook
Rahaman | Relativistic isotropic stellar model with Durgapal-V metric in $f({R},
{T})$ gravity | 34 pages, 9 figures, 2 tables | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The main aim of this paper is to obtain a completely new relativistic
non-singular model for static, spherically symmetric isotropic celestial
compact stars in the $f(R, T)$ gravity scenario. In this regard, we have
considered the isotropic Durgapal-V metric {\it ansatz} \cite{dur82} to find
the solutions of Einstein... | [
{
"created": "Fri, 12 Jan 2024 17:21:25 GMT",
"version": "v1"
}
] | 2024-01-17 | [
[
"Sarkar",
"Nayan",
""
],
[
"Sarkar",
"Susmita",
""
],
[
"Sarkar",
"Banashree Sen Moumita",
""
],
[
"Rahaman",
"Farook",
""
]
] | The main aim of this paper is to obtain a completely new relativistic non-singular model for static, spherically symmetric isotropic celestial compact stars in the $f(R, T)$ gravity scenario. In this regard, we have considered the isotropic Durgapal-V metric {\it ansatz} \cite{dur82} to find the solutions of Einstein's... |
2207.06174 | Fabrizio Di Giovanni | Fabrizio Di Giovanni, Davide Guerra, Simone Albanesi, Miquel
Miravet-Ten\'es, Dimitra Tseneklidou | Fermion-axion stars: static solutions and dynamical stability | git repository for the code:
https://github.com/SimoneA96/fermion-axion-pywrap | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct spherically-symmetric static solutions of the
Einstein-Klein-Gordon-Euler system involving a complex scalar field governed by
a periodic potential which emerges in models of axion-like particles, and
fermionic matter modeled by a perfect fluid with a polytropic equation of
state. Such solutions describe ... | [
{
"created": "Wed, 13 Jul 2022 13:14:12 GMT",
"version": "v1"
}
] | 2022-07-14 | [
[
"Di Giovanni",
"Fabrizio",
""
],
[
"Guerra",
"Davide",
""
],
[
"Albanesi",
"Simone",
""
],
[
"Miravet-Tenés",
"Miquel",
""
],
[
"Tseneklidou",
"Dimitra",
""
]
] | We construct spherically-symmetric static solutions of the Einstein-Klein-Gordon-Euler system involving a complex scalar field governed by a periodic potential which emerges in models of axion-like particles, and fermionic matter modeled by a perfect fluid with a polytropic equation of state. Such solutions describe gr... |
0706.0740 | Sascha Husa | Sascha Husa, Jose A. Gonzalez, Mark Hannam, Bernd Bruegmann, Ulrich
Sperhake | Reducing phase error in long numerical binary black hole evolutions with
sixth order finite differencing | 13 pages, 6 figures | Class.Quant.Grav.25:105006,2008 | 10.1088/0264-9381/25/10/105006 | null | gr-qc | null | We describe a modification of a fourth-order accurate ``moving puncture''
evolution code, where by replacing spatial fourth-order accurate differencing
operators in the bulk of the grid by a specific choice of sixth-order accurate
stencils we gain significant improvements in accuracy. We illustrate the
performance of... | [
{
"created": "Tue, 5 Jun 2007 21:36:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Husa",
"Sascha",
""
],
[
"Gonzalez",
"Jose A.",
""
],
[
"Hannam",
"Mark",
""
],
[
"Bruegmann",
"Bernd",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | We describe a modification of a fourth-order accurate ``moving puncture'' evolution code, where by replacing spatial fourth-order accurate differencing operators in the bulk of the grid by a specific choice of sixth-order accurate stencils we gain significant improvements in accuracy. We illustrate the performance of t... |
1212.6622 | Philippe G. LeFloch | Philippe G. LeFloch and Hasan Makhlof | The geometric finite volume method for compressible fluid flows on
Schwarzschild spacetime | 22 pages | null | null | null | gr-qc math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the relativistic Euler equations governing spherically symmetric,
perfect fluid flows on the outer domain of communication of Schwarzschild
spacetime, and we introduce a version of the finite volume method which is
formulated geometrically (without choosing coordinates a priori) and is
well--balanced, in ... | [
{
"created": "Sat, 29 Dec 2012 12:44:35 GMT",
"version": "v1"
}
] | 2013-01-01 | [
[
"LeFloch",
"Philippe G.",
""
],
[
"Makhlof",
"Hasan",
""
]
] | We consider the relativistic Euler equations governing spherically symmetric, perfect fluid flows on the outer domain of communication of Schwarzschild spacetime, and we introduce a version of the finite volume method which is formulated geometrically (without choosing coordinates a priori) and is well--balanced, in th... |
gr-qc/0503012 | Jose Carlos de Araujo | J. C. N. de Araujo, O. D. Miranda, O. D. Aguiar | Detectability of f-mode Unstable Neutron Stars by the Schenberg
Spherical Antenna | 7 pages, 3 figures; Classical and Quantum Gravity (in press) | Class.Quant.Grav. 22 (2005) S471-S478 | 10.1088/0264-9381/22/10/045 | null | gr-qc astro-ph | null | The Brazilian spherical antenna (Schenberg) is planned to detect high
frequency gravitational waves (GWs) ranging from 3.0 kHz to 3.4 kHz. There is a
host of astrophysical sources capable of being detected by the Brazilian
antenna, namely: core collapse in supernova events; (proto)neutron stars
undergoing hydrodynami... | [
{
"created": "Thu, 3 Mar 2005 18:25:38 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"de Araujo",
"J. C. N.",
""
],
[
"Miranda",
"O. D.",
""
],
[
"Aguiar",
"O. D.",
""
]
] | The Brazilian spherical antenna (Schenberg) is planned to detect high frequency gravitational waves (GWs) ranging from 3.0 kHz to 3.4 kHz. There is a host of astrophysical sources capable of being detected by the Brazilian antenna, namely: core collapse in supernova events; (proto)neutron stars undergoing hydrodynamica... |
2408.01136 | Enderson Falc\'on | Enderson Falc\'on-G\'omez, Vittorio De Falco, Kerlos Atia Abdalmalak,
Adri\'an Amor-Mart\'in, Valent\'in De La Rubia, Gabriel Santamar\'ia-Botello,
and Luis Enrique Garc\'ia Mu\~noz | Fully metallic geodesic lenses as analog electromagnetic models of
static and spherically symmetric gravitational fields | 16 pages, 6 figures, accepted for publication in Physical Review D | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We demonstrate that a fully metallic and air-filled geodesic waveguide can be
employed as an analog electromagnetic model of a static and spherically
symmetric gravitational field. By following the Plebanski formalism, a
space-time metric of the aforementioned type is firstly encoded into the
electromagnetic properti... | [
{
"created": "Fri, 2 Aug 2024 09:30:07 GMT",
"version": "v1"
}
] | 2024-08-05 | [
[
"Falcón-Gómez",
"Enderson",
""
],
[
"De Falco",
"Vittorio",
""
],
[
"Abdalmalak",
"Kerlos Atia",
""
],
[
"Amor-Martín",
"Adrián",
""
],
[
"De La Rubia",
"Valentín",
""
],
[
"Santamaría-Botello",
"Gabriel",
""
],
[
... | We demonstrate that a fully metallic and air-filled geodesic waveguide can be employed as an analog electromagnetic model of a static and spherically symmetric gravitational field. By following the Plebanski formalism, a space-time metric of the aforementioned type is firstly encoded into the electromagnetic properties... |
gr-qc/9912055 | Reinhard Meinel | Reinhard Meinel | Gravitational fields of rotating disks and black holes | 7 pages, 2 figures. Talk presented at the "Journees Relativistes" in
Weimar, September 1999. Submitted to Ann. Phys. (Leipzig) | Annalen Phys.9:335,2000 | 10.1002/(SICI)1521-3889(200005)9:3/5<335::AID-ANDP335>3.0.CO;2-D | null | gr-qc astro-ph | null | The two known exact solutions of Einstein's field equations describing
rotating objects of physical significance - a black hole and a rigidly rotating
disk of dust - are discussed using a single mathematical framework related to
Jacobi's inversion problem. Both solutions can be represented in such a form
that they di... | [
{
"created": "Tue, 14 Dec 1999 18:56:38 GMT",
"version": "v1"
}
] | 2011-05-24 | [
[
"Meinel",
"Reinhard",
""
]
] | The two known exact solutions of Einstein's field equations describing rotating objects of physical significance - a black hole and a rigidly rotating disk of dust - are discussed using a single mathematical framework related to Jacobi's inversion problem. Both solutions can be represented in such a form that they diff... |
1410.3573 | Lorenzo Sebastiani | Ratbay Myrzakulov and Lorenzo Sebastiani | Inhomogeneous viscous fluids for inflation | 14 pages, final version, accepted in Astrophys. Space Sci | Astrophys.Space Sci. 356 (2015) 1, 205-213 | 10.1007/s10509-014-2203-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate inhomogeneous viscous fluid cosmology for
inflation. Several toy models are presented in the attempt to analyze how
inflation can be realized according with cosmological data by making use of an
inhomogeneous EoS parameter for the fluid and/or by introducing a viscosity to
have a gracefu... | [
{
"created": "Tue, 14 Oct 2014 04:56:11 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Nov 2014 12:33:58 GMT",
"version": "v2"
}
] | 2015-09-21 | [
[
"Myrzakulov",
"Ratbay",
""
],
[
"Sebastiani",
"Lorenzo",
""
]
] | In this paper, we investigate inhomogeneous viscous fluid cosmology for inflation. Several toy models are presented in the attempt to analyze how inflation can be realized according with cosmological data by making use of an inhomogeneous EoS parameter for the fluid and/or by introducing a viscosity to have a graceful ... |
1704.02027 | Ikjyot Singh Kohli | Ikjyot Singh Kohli and Michael C. Haslam | Dynamics of a Bianchi Type I Model With a Concave Potential | null | null | null | null | gr-qc math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the dynamics of a Bianchi Type I potential in the
presence of a concave potential of the form $V(\phi) = V_0 \left[1- \left(
\frac{\phi}{\mu}\right)^n\right]$, where $V_0$ is a constant, and $\mu$ is a
mass scale. We show that there are two classes of equilibrium points. The first
class corres... | [
{
"created": "Thu, 6 Apr 2017 21:33:17 GMT",
"version": "v1"
}
] | 2017-04-10 | [
[
"Kohli",
"Ikjyot Singh",
""
],
[
"Haslam",
"Michael C.",
""
]
] | In this paper, we study the dynamics of a Bianchi Type I potential in the presence of a concave potential of the form $V(\phi) = V_0 \left[1- \left( \frac{\phi}{\mu}\right)^n\right]$, where $V_0$ is a constant, and $\mu$ is a mass scale. We show that there are two classes of equilibrium points. The first class correspo... |
1409.2007 | Luca Fabbri | Luca Fabbri | A discussion on the most general torsion-gravity with electrodynamics
for Dirac spinor matter fields | 7 pages | Int.J.Geom.Meth.Mod.Phys.12:1550099(2015) | 10.1142/S0219887815500991 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the most general torsional completion of gravitation together
with electrodynamics for the Dirac spinorial material fields, and we show that
consistency arguments constrain torsion to be completely antisymmetric and the
dynamics to be parity-invariant and described by actions that are either
least-order d... | [
{
"created": "Sat, 6 Sep 2014 12:14:15 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 2015 09:59:50 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Jul 2015 11:44:24 GMT",
"version": "v3"
}
] | 2015-10-27 | [
[
"Fabbri",
"Luca",
""
]
] | We consider the most general torsional completion of gravitation together with electrodynamics for the Dirac spinorial material fields, and we show that consistency arguments constrain torsion to be completely antisymmetric and the dynamics to be parity-invariant and described by actions that are either least-order der... |
1410.5283 | Yusuf Kucukakca | Ganim Gecim, Yusuf Kucukakca, Yusuf Sucu | Noether gauge symmetry of Dirac field in $2+1$ dimensional gravity | 6 pages, no figure, typos corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider a gravitational theory including a Dirac field
that is non-minimal coupled to gravity in $2+1$ dimensions. Noether gauge
symmetry approach can be used to fix the form of coupling function $F(\Psi)$
and the potential $V(\Psi)$ of the Dirac field and to obtain a constant of
motion for the dyn... | [
{
"created": "Mon, 20 Oct 2014 14:06:32 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Feb 2015 13:29:07 GMT",
"version": "v2"
}
] | 2015-02-18 | [
[
"Gecim",
"Ganim",
""
],
[
"Kucukakca",
"Yusuf",
""
],
[
"Sucu",
"Yusuf",
""
]
] | In this paper, we consider a gravitational theory including a Dirac field that is non-minimal coupled to gravity in $2+1$ dimensions. Noether gauge symmetry approach can be used to fix the form of coupling function $F(\Psi)$ and the potential $V(\Psi)$ of the Dirac field and to obtain a constant of motion for the dynam... |
0712.1315 | Paul Wesson | Paul S. Wesson | The Meaning of Dimensions | null | Wesson P.S. (2008), The Meaning of Dimensions in Relativity and
the Dimensionality of the World, Series: Fundamental Theories of Physics, Vol
153 Petkov, Vesselin (Ed.), 276 p | 10.1007/978-1-4020-6318-3_1 | null | gr-qc | null | We review the current status of dimensions, as the result of a long and
controversial history that includes input from philosophy and physics. Our
conclusion is that they are subjective but essential concepts which provide a
kind of book-keeping device, their number increasing as required by advances in
physics. The ... | [
{
"created": "Sun, 9 Dec 2007 00:13:53 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Wesson",
"Paul S.",
""
]
] | We review the current status of dimensions, as the result of a long and controversial history that includes input from philosophy and physics. Our conclusion is that they are subjective but essential concepts which provide a kind of book-keeping device, their number increasing as required by advances in physics. The wo... |
1001.4922 | Shih-Yuin Lin | Shih-Yuin Lin, Chung-Hsien Chou, B. L. Hu | Quantum entanglement and entropy in particle creation | 14 pages, no figure; Typos corrected. | Phys.Rev.D81:084018,2010 | 10.1103/PhysRevD.81.084018 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the basic theoretical issues in the quantum entanglement of
particle pairs created from the vacuum in a time-dependent background field or
spacetime. Similar to entropy generation from these processes which depends on
the choice of physical variables and how certain information is coarse-grained,
entan... | [
{
"created": "Wed, 27 Jan 2010 12:10:04 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Apr 2010 08:43:36 GMT",
"version": "v2"
}
] | 2010-05-07 | [
[
"Lin",
"Shih-Yuin",
""
],
[
"Chou",
"Chung-Hsien",
""
],
[
"Hu",
"B. L.",
""
]
] | We investigate the basic theoretical issues in the quantum entanglement of particle pairs created from the vacuum in a time-dependent background field or spacetime. Similar to entropy generation from these processes which depends on the choice of physical variables and how certain information is coarse-grained, entangl... |
1006.0634 | Alejandro Perez | Jonathan Engle, Karim Noui, Alejandro Perez, Daniele Pranzetti | Black hole entropy from an SU(2)-invariant formulation of Type I
isolated horizons | 30 pages, 1 figure | Phys.Rev.D82:044050,2010 | 10.1103/PhysRevD.82.044050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed analysis of the spherically symmetric isolated horizon system is
performed in terms of the connection formulation of general relativity. The
system is shown to admit a manifestly SU(2) invariant formulation where the
(effective) horizon degrees of freedom are described by an SU(2) Chern-Simons
theory. This... | [
{
"created": "Thu, 3 Jun 2010 12:49:36 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Engle",
"Jonathan",
""
],
[
"Noui",
"Karim",
""
],
[
"Perez",
"Alejandro",
""
],
[
"Pranzetti",
"Daniele",
""
]
] | A detailed analysis of the spherically symmetric isolated horizon system is performed in terms of the connection formulation of general relativity. The system is shown to admit a manifestly SU(2) invariant formulation where the (effective) horizon degrees of freedom are described by an SU(2) Chern-Simons theory. This l... |
0805.3880 | Demetrios Christodoulou | Demetrios Christodoulou | The Formation of Black Holes in General Relativity | 594 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The subject of this work is the formation of black holes in pure general
relativity, by the focusing of incoming gravitational waves. The theorems
established in this monograph constitute the first foray into the long time
dynamics of general relativity in the large, that is, when the initial data are
no longer confi... | [
{
"created": "Mon, 26 May 2008 06:39:32 GMT",
"version": "v1"
}
] | 2008-05-27 | [
[
"Christodoulou",
"Demetrios",
""
]
] | The subject of this work is the formation of black holes in pure general relativity, by the focusing of incoming gravitational waves. The theorems established in this monograph constitute the first foray into the long time dynamics of general relativity in the large, that is, when the initial data are no longer confine... |
gr-qc/0001096 | Ilja Schmelzer | I. Schmelzer | A Metric Theory of Gravity with Condensed Matter Interpretation | 9 pages Latex, no figures | null | null | WIAS Preprint 549 | gr-qc | null | We present a metric theory of gravity with Lagrangian
L = (8\pi G)^{-1}(\Xi g^{ii} - \Upsilon g^{00})\sqrt{-g} + L_{GR} +
L_{matter}
motivated by classical equations
\partial_t \rho + \partial_i (\rho v^i) = 0
\partial_t (\rho v^j) + \partial_i (\rho v^i v^j + p^{ij}) = 0
for a medium in Newtonian space-tim... | [
{
"created": "Fri, 28 Jan 2000 14:18:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmelzer",
"I.",
""
]
] | We present a metric theory of gravity with Lagrangian L = (8\pi G)^{-1}(\Xi g^{ii} - \Upsilon g^{00})\sqrt{-g} + L_{GR} + L_{matter} motivated by classical equations \partial_t \rho + \partial_i (\rho v^i) = 0 \partial_t (\rho v^j) + \partial_i (\rho v^i v^j + p^{ij}) = 0 for a medium in Newtonian space-time. We obtain... |
gr-qc/0601121 | Joseph Henson | Joe Henson | The causal set approach to quantum gravity | 22 pages, 4 figures, Latex. Extended version of a review to be
published in "Approaches to Quantum Gravity - Towards a new understanding of
space and time" (ed. D. Oriti), Cambridge University Press, 2006. Ref added.
Dedicated to Rafael Sorkin on the occasion of his 60th birthday | null | null | null | gr-qc | null | The ideas of spacetime discreteness and causality are important in several of
the popular approaches to quantum gravity. But if discreteness is accepted as
an initial assumption, conflict with Lorentz invariance can be a consequence.
The causal set is a discrete structure which avoids this problem and provides a
poss... | [
{
"created": "Fri, 27 Jan 2006 14:49:59 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2006 10:46:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Henson",
"Joe",
""
]
] | The ideas of spacetime discreteness and causality are important in several of the popular approaches to quantum gravity. But if discreteness is accepted as an initial assumption, conflict with Lorentz invariance can be a consequence. The causal set is a discrete structure which avoids this problem and provides a possib... |
2112.09870 | Marc Henneaux | S. Deser and M. Henneaux | Higher spin $m\not=0$ excitations on curved backgrounds and cosmological
supergravity | Addentum to Class. Quant. Grav. 24 (2007), 1683-1686 - important
comment by S. Deser added | null | 10.1088/0264-9381/24/6/N01 | Caltech 2021-043; Brandeis BRX-TH 6695 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Some time ago, we showed that a weak (linear) massless spin 2 wave could only
propagate on a Ricci-flat or Ricci-constant background: it must necessarily be
a perturbation of General Relativity. This was just the continuation of the
higher spin chain: massless $s=3/2$ also required Ricci-flatness (which is the
basis ... | [
{
"created": "Sat, 18 Dec 2021 07:57:13 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2021 06:53:39 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Mar 2022 03:16:53 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Mar 2023 18:14:55 GMT",
"version": "v4"
}
] | 2023-03-29 | [
[
"Deser",
"S.",
""
],
[
"Henneaux",
"M.",
""
]
] | Some time ago, we showed that a weak (linear) massless spin 2 wave could only propagate on a Ricci-flat or Ricci-constant background: it must necessarily be a perturbation of General Relativity. This was just the continuation of the higher spin chain: massless $s=3/2$ also required Ricci-flatness (which is the basis of... |
gr-qc/0501068 | Szabolcs M\'arka | The LIGO Scientific Collaboration | A Search for Gravitational Waves Associated with the Gamma Ray Burst
GRB030329 Using the LIGO Detectors | 18 pages, 9 figures and 3 tables; Updated according to journal
reviewer's comments | Phys.Rev.D72:042002,2005 | 10.1103/PhysRevD.72.042002 | LIGO-P040007-07-D | gr-qc astro-ph | null | We have performed a search for bursts of gravitational waves associated with
the very bright Gamma Ray Burst GRB030329, using the two detectors at the LIGO
Hanford Observatory. Our search covered the most sensitive frequency range of
the LIGO detectors (approximately 80-2048 Hz), and we specifically targeted
signals ... | [
{
"created": "Mon, 24 Jan 2005 03:25:30 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Feb 2005 21:22:15 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jun 2005 05:37:53 GMT",
"version": "v3"
}
] | 2012-08-27 | [
[
"The LIGO Scientific Collaboration",
"",
""
]
] | We have performed a search for bursts of gravitational waves associated with the very bright Gamma Ray Burst GRB030329, using the two detectors at the LIGO Hanford Observatory. Our search covered the most sensitive frequency range of the LIGO detectors (approximately 80-2048 Hz), and we specifically targeted signals sh... |
gr-qc/0101012 | Claudio Furtado | A. C. V. V. de Siqueira (Universidade Federal Rural de Pernambuco -
Brazil) | Exact Solutions of Einstein Equations | 06 pages, Latex 2.09, no figures | null | null | null | gr-qc | null | We use a metric of the type Friedmann-Robertson-Walker to obtain new exact
solutions of Einstein equations for a scalar and massive field. The solutions
have a permanent or transitory inflationary behavior.
| [
{
"created": "Tue, 2 Jan 2001 13:00:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Siqueira",
"A. C. V. V.",
"",
"Universidade Federal Rural de Pernambuco -\n Brazil"
]
] | We use a metric of the type Friedmann-Robertson-Walker to obtain new exact solutions of Einstein equations for a scalar and massive field. The solutions have a permanent or transitory inflationary behavior. |
1807.10627 | Aizhan Myrzakul R | Aizhan Myrzakul and Michael R.R. Good | Unitary evaporation via modified Regge-Wheeler coordinate | Contribution to MG15 proceedings, BH8, Hawking radiation in analogue
black holes, 6 pages | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Constructing an exact correspondence between a black hole model, formed from
the most simple solution of Einstein's equations, and a particular moving
mirror trajectory, we investigate a new model that preserves unitarity. The
Bogoliubov coefficients in 1+1 dimensions are computed analytically. The key
modification l... | [
{
"created": "Thu, 26 Jul 2018 12:01:57 GMT",
"version": "v1"
}
] | 2018-07-30 | [
[
"Myrzakul",
"Aizhan",
""
],
[
"Good",
"Michael R. R.",
""
]
] | Constructing an exact correspondence between a black hole model, formed from the most simple solution of Einstein's equations, and a particular moving mirror trajectory, we investigate a new model that preserves unitarity. The Bogoliubov coefficients in 1+1 dimensions are computed analytically. The key modification lim... |
gr-qc/0303100 | Chiao | R. Y. Chiao | Conceptual tensions between quantum mechanics and general relativity:
Are there experimental consequences? | 37 pages, 4 figures, for Wheeler's 90th Birthday Symposium
Proceedings, to be published by Cambridge University Press | null | null | UCB-phys-03-25-03 | gr-qc | null | One of the conceptual tensions between quantum mechanics (QM) and general
relativity (GR) arises from the clash between the spatial nonseparability of
entangled states in QM, and the complete spatial separability of all physical
systems in GR, i.e., between the nonlocality implied by the superposition
principle, and ... | [
{
"created": "Tue, 25 Mar 2003 22:51:19 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Apr 2003 17:27:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chiao",
"R. Y.",
""
]
] | One of the conceptual tensions between quantum mechanics (QM) and general relativity (GR) arises from the clash between the spatial nonseparability of entangled states in QM, and the complete spatial separability of all physical systems in GR, i.e., between the nonlocality implied by the superposition principle, and th... |
0804.3619 | Serguei Krasnikov | S. Krasnikov | Falling into the Schwarzschild black hole. Important details | v1. In Russian v.2 Replaced by the English version | Gravitation and Cosmology 14 (2008) 362 | 10.1134/S0202289308040129 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Schwarzschild space is one of the best studied spacetimes and its
exhaustive considerations are easily accessible. Nevertheless, by some reasons
it is still surrounded by a lot of misconceptions, myths, and "paradoxes". In
this pedagogical paper an attempt is made to give a simple (i. e., without
cumbersome calcu... | [
{
"created": "Tue, 22 Apr 2008 22:51:54 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Oct 2008 22:13:43 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Krasnikov",
"S.",
""
]
] | The Schwarzschild space is one of the best studied spacetimes and its exhaustive considerations are easily accessible. Nevertheless, by some reasons it is still surrounded by a lot of misconceptions, myths, and "paradoxes". In this pedagogical paper an attempt is made to give a simple (i. e., without cumbersome calcula... |
1306.0527 | Claudio Dappiaggi | Marco Benini, Claudio Dappiaggi, Thomas-Paul Hack | Quantum Field Theory on Curved Backgrounds -- A Primer | 36 pages, invited review, typos corrected, references added | Int. Jour. Mod. Phys. A 28 (2013) 1330023 | 10.1142/S0217751X13300238 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Goal of this review is to introduce the algebraic approach to quantum field
theory on curved backgrounds. Based on a set of axioms, first written down by
Haag and Kastler, this method consists of a two-step procedure. In the first
one, a suitable algebra of observables is assigned to a physical system, which
is meant... | [
{
"created": "Mon, 3 Jun 2013 18:16:21 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jun 2013 16:58:00 GMT",
"version": "v2"
}
] | 2013-07-02 | [
[
"Benini",
"Marco",
""
],
[
"Dappiaggi",
"Claudio",
""
],
[
"Hack",
"Thomas-Paul",
""
]
] | Goal of this review is to introduce the algebraic approach to quantum field theory on curved backgrounds. Based on a set of axioms, first written down by Haag and Kastler, this method consists of a two-step procedure. In the first one, a suitable algebra of observables is assigned to a physical system, which is meant t... |
1009.4876 | Abhay Shah | Abhay Shah, Tobias Keidl, John Friedman, Dong-Hoon Kim, Larry Price | Conservative, gravitational self-force for a particle in circular orbit
around a Schwarzschild black hole in a Radiation Gauge | 21 pages, 2 figures | Phys.Rev.D83:064018,2011 | 10.1103/PhysRevD.83.064018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the second of two companion papers on computing the self-force in a
radiation gauge; more precisely, the method uses a radiation gauge for the
radiative part of the metric perturbation, together with an arbitrarily chosen
gauge for the parts of the perturbation associated with changes in black-hole
mass and s... | [
{
"created": "Fri, 24 Sep 2010 15:59:56 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jan 2011 16:22:47 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jan 2011 03:56:35 GMT",
"version": "v3"
},
{
"created": "Mon, 7 Mar 2011 20:32:56 GMT",
"version": "v4"
}
] | 2011-03-22 | [
[
"Shah",
"Abhay",
""
],
[
"Keidl",
"Tobias",
""
],
[
"Friedman",
"John",
""
],
[
"Kim",
"Dong-Hoon",
""
],
[
"Price",
"Larry",
""
]
] | This is the second of two companion papers on computing the self-force in a radiation gauge; more precisely, the method uses a radiation gauge for the radiative part of the metric perturbation, together with an arbitrarily chosen gauge for the parts of the perturbation associated with changes in black-hole mass and spi... |
gr-qc/9805068 | N. K. Dadhich | Naresh Dadhich | On Electrogravity Duality | 9 pages, LaTeX version | Mod.Phys.Lett. A14 (1999) 337-342 | 10.1142/S0217732399000389 | IUCAA-17/98 | gr-qc | null | By resolving the gravitational field into electric and magnetic parts, we
define an electrogravity duality transformation and discover an interesting
property of the field. Under the duality transformation a vacuum/flat spacetime
maps into the original spacetime with a topological defect of global
monopole/texture. T... | [
{
"created": "Mon, 18 May 1998 15:35:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dadhich",
"Naresh",
""
]
] | By resolving the gravitational field into electric and magnetic parts, we define an electrogravity duality transformation and discover an interesting property of the field. Under the duality transformation a vacuum/flat spacetime maps into the original spacetime with a topological defect of global monopole/texture. The... |
1001.4832 | Alfredo Sandoval-Villalbazo | A. Sandoval-Villalbazo, A. L. Garcia-Perciante | A causality analysis of the linearized relativistic Navier-Stokes
equations | Invited review for Festschrift in honor of Prof. Leopoldo
Garcia-Colin Scherer | New trends in statistical physics, Festschrift in Honor of
Leopoldo Garcia-Colin's 80th Birthday, pp 293-301, World Scientific (2010) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown by means of a simple analysis that the linearized system of
transport equations for a relativistic, single component ideal gas at rest
obeys the \textit{antecedence principle}, which is often referred to as
causality principle. This task is accomplished by examining the roots of the
dispersion relation fo... | [
{
"created": "Wed, 27 Jan 2010 00:51:39 GMT",
"version": "v1"
}
] | 2010-08-04 | [
[
"Sandoval-Villalbazo",
"A.",
""
],
[
"Garcia-Perciante",
"A. L.",
""
]
] | It is shown by means of a simple analysis that the linearized system of transport equations for a relativistic, single component ideal gas at rest obeys the \textit{antecedence principle}, which is often referred to as causality principle. This task is accomplished by examining the roots of the dispersion relation for ... |
gr-qc/0412126 | Hyerim Noh | J. Hwang and H. Noh | Classical evolution and quantum generation in generalized gravity
theories including string corrections and tachyon: Unified analyses | 24 pages, no figure | Phys.Rev. D71 (2005) 063536 | 10.1103/PhysRevD.71.063536 | null | gr-qc astro-ph hep-th | null | We present cosmological perturbation theory based on generalized gravity
theories including string theory correction terms and a tachyonic complication.
The classical evolution as well as the quantum generation processes in these
variety of gravity theories are presented in unified forms. These apply both to
the scal... | [
{
"created": "Thu, 30 Dec 2004 03:26:37 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Hwang",
"J.",
""
],
[
"Noh",
"H.",
""
]
] | We present cosmological perturbation theory based on generalized gravity theories including string theory correction terms and a tachyonic complication. The classical evolution as well as the quantum generation processes in these variety of gravity theories are presented in unified forms. These apply both to the scalar... |
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