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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2010.13580 | Vasilis Oikonomou | S.D. Odintsov, V.K Oikonomou, F.P. Fronimos, K.V. Fasoulakos | Unification of a Bounce with a Viable Dark Energy Era in Gauss-Bonnet
Gravity | PRD accepted | null | 10.1103/PhysRevD.102.104042 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we shall demonstrate that it is possible to describe in a
unified way a primordial bounce with the dark energy era, in the context of
Gauss-Bonnet modified gravity. Particularly, the early time bounce has a nearly
scale invariant power spectrum of primordial scalar curvature perturbations,
while the dark... | [
{
"created": "Mon, 26 Oct 2020 13:33:06 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K",
""
],
[
"Fronimos",
"F. P.",
""
],
[
"Fasoulakos",
"K. V.",
""
]
] | In this work we shall demonstrate that it is possible to describe in a unified way a primordial bounce with the dark energy era, in the context of Gauss-Bonnet modified gravity. Particularly, the early time bounce has a nearly scale invariant power spectrum of primordial scalar curvature perturbations, while the dark e... |
gr-qc/0612114 | Jan Schee | Z. Stuchl\'ik, J. Schee | Fluctuations of CMBR in accelerating universe | null | AIPConf.Proc.861:1051-1058,2006 | 10.1063/1.2399698 | null | gr-qc | null | The influence of the observed relict vacuum energy on the fluctuations of
CMBR going through cosmological matter condensations is studied in the
framework of the Einstein-Strauss-de Sitter vakuola model. It is shown that
refraction of light at the matching surface of the vakuola and the expanding
Friedman universe ca... | [
{
"created": "Tue, 19 Dec 2006 14:05:21 GMT",
"version": "v1"
}
] | 2016-08-16 | [
[
"Stuchlík",
"Z.",
""
],
[
"Schee",
"J.",
""
]
] | The influence of the observed relict vacuum energy on the fluctuations of CMBR going through cosmological matter condensations is studied in the framework of the Einstein-Strauss-de Sitter vakuola model. It is shown that refraction of light at the matching surface of the vakuola and the expanding Friedman universe can ... |
0903.0986 | Harold Steinacker | Daniela Klammer, Harold Steinacker | Cosmological solutions of emergent noncommutative gravity | 4 pages, 2 figures. V2: version accepted by Phys.Rev.Lett. plus one
picture | Phys.Rev.Lett.102:221301,2009 | 10.1103/PhysRevLett.102.221301 | UWTHPh-2009-02 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Matrix models of Yang-Mills type lead to an emergent gravity theory, which
may not require fine-tuning of a cosmological constant. We find cosmological
solutions of Friedmann-Robertson-Walker type. They generically have a big
bounce, and an early inflation-like phase with graceful exit. The mechanism is
purely geomet... | [
{
"created": "Thu, 5 Mar 2009 13:50:02 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2009 13:53:40 GMT",
"version": "v2"
}
] | 2009-07-22 | [
[
"Klammer",
"Daniela",
""
],
[
"Steinacker",
"Harold",
""
]
] | Matrix models of Yang-Mills type lead to an emergent gravity theory, which may not require fine-tuning of a cosmological constant. We find cosmological solutions of Friedmann-Robertson-Walker type. They generically have a big bounce, and an early inflation-like phase with graceful exit. The mechanism is purely geometri... |
1106.1118 | Viqar Husain | Benjamin K. Tippett and Viqar Husain | Gravitational collapse of quantum matter | 8 pages, 4 figures, revtex 2col | null | 10.1103/PhysRevD.84.104031 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a class of exactly soluble models for gravitational collapse in
spherical symmetry obtained by patching dynamical spherically symmetric
exterior spacetimes with cosmological interior spacetimes. These are
generalizations of the Oppenheimer-Snyder type models to include classical and
quantum scalar fields ... | [
{
"created": "Mon, 6 Jun 2011 16:48:26 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Tippett",
"Benjamin K.",
""
],
[
"Husain",
"Viqar",
""
]
] | We describe a class of exactly soluble models for gravitational collapse in spherical symmetry obtained by patching dynamical spherically symmetric exterior spacetimes with cosmological interior spacetimes. These are generalizations of the Oppenheimer-Snyder type models to include classical and quantum scalar fields as... |
gr-qc/0210064 | Etera R. Livine | Etera R. Livine, Daniele Oriti | Implementing causality in the spin foam quantum geometry | Latex,39 pages,8 figures, v3: minor changes, typos in some formulas
corrected, comments added, discussion of results improved | Nucl.Phys. B663 (2003) 231-279 | 10.1016/S0550-3213(03)00378-X | DAMTP-2002-127 | gr-qc hep-th | null | We analyse the classical and quantum geometry of the Barrett-Crane spin foam
model for four dimensional quantum gravity, explaining why it has to be
considering as a covariant realization of the projector operator onto physical
quantum gravity states. We discuss how causality requirements can be
consistently implemen... | [
{
"created": "Fri, 18 Oct 2002 21:45:33 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Dec 2002 09:48:02 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Feb 2003 16:16:22 GMT",
"version": "v3"
}
] | 2010-04-05 | [
[
"Livine",
"Etera R.",
""
],
[
"Oriti",
"Daniele",
""
]
] | We analyse the classical and quantum geometry of the Barrett-Crane spin foam model for four dimensional quantum gravity, explaining why it has to be considering as a covariant realization of the projector operator onto physical quantum gravity states. We discuss how causality requirements can be consistently implemente... |
1809.06669 | Cosimo Bambi | Kishalay Choudhury, Sourabh Nampalliwar, Askar B. Abdikamalov, Dimitry
Ayzenberg, Cosimo Bambi, Thomas Dauser, Javier A. Garcia | Testing the Kerr metric with X-ray Reflection Spectroscopy of Mrk 335
Suzaku data | 13 pages, 9 figures. v2: refereed version | Astrophys.J. 879: 80 (2019) | 10.3847/1538-4357/ab24d6 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein's gravity has undergone extensive tests in the weak field
gravitational limit, with results in agreement with theoretical predictions.
There exist theories beyond general relativity (GR) which modify gravity in the
strong field regime but agree with GR in the weak field. Astrophysical black
holes are believe... | [
{
"created": "Tue, 18 Sep 2018 12:27:53 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2019 22:17:37 GMT",
"version": "v2"
}
] | 2019-07-11 | [
[
"Choudhury",
"Kishalay",
""
],
[
"Nampalliwar",
"Sourabh",
""
],
[
"Abdikamalov",
"Askar B.",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Dauser",
"Thomas",
""
],
[
"Garcia",
"Javier A."... | Einstein's gravity has undergone extensive tests in the weak field gravitational limit, with results in agreement with theoretical predictions. There exist theories beyond general relativity (GR) which modify gravity in the strong field regime but agree with GR in the weak field. Astrophysical black holes are believed ... |
1005.0894 | Sergey Kozyrev | S.M. Kozyrev | The Heckmann's wormholes in Jordan-Brans-Dicke gravity | 4 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | A simple Heckmann's vacuum wormhole solution of Jordan-Brans-Dicke
gravitation is presented and analysed. It is shown that in contrast with class
I Brans solution where the throat radius becomes real when $\omega < -4/3$ here
it becomes positive when $\omega < -1$.
| [
{
"created": "Thu, 6 May 2010 06:30:12 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Kozyrev",
"S. M.",
""
]
] | A simple Heckmann's vacuum wormhole solution of Jordan-Brans-Dicke gravitation is presented and analysed. It is shown that in contrast with class I Brans solution where the throat radius becomes real when $\omega < -4/3$ here it becomes positive when $\omega < -1$. |
1009.3935 | Andrew Pontzen | Andrew Pontzen and Anthony Challinor | Linearization of homogeneous, nearly-isotropic cosmological models | 31 pages, 2 figures. Submitted to CQG | Class.Quant.Grav.28:185007,2011 | 10.1088/0264-9381/28/18/185007 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Homogeneous, nearly-isotropic Bianchi cosmological models are considered.
Their time evolution is expressed as a complete set of non-interacting linear
modes on top of a Friedmann-Robertson-Walker background model. This connects
the extensive literature on Bianchi models with the more commonly-adopted
perturbation ap... | [
{
"created": "Mon, 20 Sep 2010 20:01:01 GMT",
"version": "v1"
}
] | 2011-09-08 | [
[
"Pontzen",
"Andrew",
""
],
[
"Challinor",
"Anthony",
""
]
] | Homogeneous, nearly-isotropic Bianchi cosmological models are considered. Their time evolution is expressed as a complete set of non-interacting linear modes on top of a Friedmann-Robertson-Walker background model. This connects the extensive literature on Bianchi models with the more commonly-adopted perturbation appr... |
gr-qc/0307089 | Jonathan Oppenheim | Jonathan Oppenheim | The spectrum of quantum black holes and quasinormal modes | 5 pages, 5 figures, version to appear in Phys. Rev. D | Phys.Rev. D69 (2004) 044012 | 10.1103/PhysRevD.69.044012 | null | gr-qc hep-th quant-ph | null | The spectrum of multiple level transitions of the quantum black hole is
considered, and the line widths calculated. Initial evidence is found for these
higher order transitions in the spectrum of quasinormal modes for Schwarzschild
and Kerr black holes, further bolstering the idea that there exists a
correspondence p... | [
{
"created": "Mon, 21 Jul 2003 19:11:02 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Dec 2003 22:05:20 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Oppenheim",
"Jonathan",
""
]
] | The spectrum of multiple level transitions of the quantum black hole is considered, and the line widths calculated. Initial evidence is found for these higher order transitions in the spectrum of quasinormal modes for Schwarzschild and Kerr black holes, further bolstering the idea that there exists a correspondence pri... |
gr-qc/0701098 | Muhammad Sharif | Asghar Qadir and M. Sharif | General Formula for the Momentum Imparted to Test Particles in Arbitrary
Spacetimes | 6 pages | Phys.Lett.A167:331-334,1992 | 10.1016/0375-9601(92)90267-P | null | gr-qc | null | Ehlers and Kundt have provided an approximate procedure to demonstrate that
gravitational waves impart momentum to test particles. This was extended to
cylindrical gravitational waves by Weber and Wheeler. Here a general, exact,
formula for the momentum imparted to test particles in arbitrary spacetimes is
presented.... | [
{
"created": "Wed, 17 Jan 2007 07:47:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Qadir",
"Asghar",
""
],
[
"Sharif",
"M.",
""
]
] | Ehlers and Kundt have provided an approximate procedure to demonstrate that gravitational waves impart momentum to test particles. This was extended to cylindrical gravitational waves by Weber and Wheeler. Here a general, exact, formula for the momentum imparted to test particles in arbitrary spacetimes is presented. |
1911.11753 | Dr. Goutam Manna | Goutam Manna | Gravitational Collapse for the K-essence Emergent Vaidya Spacetime | 9 pages, 2 figures, Accepted from EPJ C | null | 10.1140/epjc/s10052-020-8383-y | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study the gravitational collapse in the {\bf k-}essence
emergent gravity using a generalized Vaidya-type metric as a background. We
also analyze the cosmic censorship hypothesis for this system. We show that the
emergent gravity metric resembles closely to the new type of the generalized
Vaidya metr... | [
{
"created": "Tue, 26 Nov 2019 18:44:01 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2020 13:08:40 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Manna",
"Goutam",
""
]
] | In this paper, we study the gravitational collapse in the {\bf k-}essence emergent gravity using a generalized Vaidya-type metric as a background. We also analyze the cosmic censorship hypothesis for this system. We show that the emergent gravity metric resembles closely to the new type of the generalized Vaidya metric... |
gr-qc/9304033 | Henri Waelbrock | Jemal Guven | Perturbations of a topological defect as a theory of scalar fields
interacting with an external vector potential | null | Phys.Rev. D48 (1993) 5562-5569 | 10.1103/PhysRevD.48.5562 | null | gr-qc | null | This is a revised version of gr-qc/9304033
| [
{
"created": "Wed, 21 Apr 1993 21:20:32 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Aug 1993 20:47:47 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Guven",
"Jemal",
""
]
] | This is a revised version of gr-qc/9304033 |
gr-qc/9701006 | Peter Leifer | Peter Leifer | Why we can not see the curvature of the quantum state space? | 9 pages,LaTeX | null | null | null | gr-qc | null | A new type of gauge quantum theory (superrelativity) has been proposed. This
differs from ordinary gauge theories in sense that the affine connection of our
theory is constructed from first derivatives of the Fubini-Study metric tensor.
That is we have not merely analogy with general relativity but this
construction ... | [
{
"created": "Mon, 6 Jan 1997 20:37:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Leifer",
"Peter",
""
]
] | A new type of gauge quantum theory (superrelativity) has been proposed. This differs from ordinary gauge theories in sense that the affine connection of our theory is constructed from first derivatives of the Fubini-Study metric tensor. That is we have not merely analogy with general relativity but this construction sh... |
1907.08193 | F. S. Guzman | F. S. Guzman | The three dynamical fates of Boson Stars | 8 pages. Academic paper published in the Mexican Journal of Physics
back in 2009. arXiv admin note: text overlap with arXiv:1007.1162 | Rev. Mex. Fis. 55, 321-326 (2009) | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript the three types of late-time behavior of spherically
symmetric Boson Stars are presented, these are: stable configurations, unstable
bounded that collapse to form black holes and unstable unbounded that explode.
The results are found by solving the spherically symmetric
Einstein-Klein-Gordon system... | [
{
"created": "Thu, 18 Jul 2019 10:26:42 GMT",
"version": "v1"
}
] | 2019-07-22 | [
[
"Guzman",
"F. S.",
""
]
] | In this manuscript the three types of late-time behavior of spherically symmetric Boson Stars are presented, these are: stable configurations, unstable bounded that collapse to form black holes and unstable unbounded that explode. The results are found by solving the spherically symmetric Einstein-Klein-Gordon system o... |
gr-qc/0701174 | Branko Saric | Branko Saric | One common solution to the singularity and perihelion problems | 18 pages, 1 figure | null | null | null | gr-qc | null | Based on the kinetic energy theorem, as one of the fundamental theorems from
the classical mechanics, throughout the first part of the article an attempt
has been made to derive the mathematical model of a material point motion in
the three-dimensional spatial subspace of the integral four-dimensional
space-time cont... | [
{
"created": "Wed, 31 Jan 2007 16:17:48 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Feb 2007 12:32:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Saric",
"Branko",
""
]
] | Based on the kinetic energy theorem, as one of the fundamental theorems from the classical mechanics, throughout the first part of the article an attempt has been made to derive the mathematical model of a material point motion in the three-dimensional spatial subspace of the integral four-dimensional space-time contin... |
1912.03164 | Geoffrey Comp\`ere | Geoffrey Comp\`ere, Roberto Oliveri, Ali Seraj | The Poincar\'e and BMS flux-balance laws with application to binary
systems | 32 pages + appendices; v2: minor changes, improved version; v3:
published version, refs added; v4: Erratum version: typos corrected | J. High Energ. Phys. 2020, 116 (2020) | 10.1007/JHEP10(2020)116 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Asymptotically flat spacetimes admit both supertranslations and Lorentz
transformations as asymptotic symmetries. Furthermore, they admit super-Lorentz
transformations, namely superrotations and superboosts, as outer symmetries
associated with super-angular momentum and super-center-of-mass charges. In
this paper, we... | [
{
"created": "Fri, 6 Dec 2019 14:53:14 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Sep 2020 07:44:35 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Oct 2020 09:36:44 GMT",
"version": "v3"
},
{
"created": "Tue, 4 Jun 2024 11:50:32 GMT",
"version": "v4"
}
] | 2024-06-05 | [
[
"Compère",
"Geoffrey",
""
],
[
"Oliveri",
"Roberto",
""
],
[
"Seraj",
"Ali",
""
]
] | Asymptotically flat spacetimes admit both supertranslations and Lorentz transformations as asymptotic symmetries. Furthermore, they admit super-Lorentz transformations, namely superrotations and superboosts, as outer symmetries associated with super-angular momentum and super-center-of-mass charges. In this paper, we p... |
1407.3101 | I. V. Kanatchikov | I.V. Kanatchikov | On precanonical quantization of gravity | 6pp | Nonlin. Phenom. Complex Sys. (NPCS) 17 (2014) 372-376 | null | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precanonical quantization is based on the mathematical structures of the De
Donder-Weyl Hamiltonization of field theories. The resulting formulation of
quantum gravity describes the quantum geometry of space-time in terms of
operator-valued distances and the transition amplitudes between the values of
spin connection... | [
{
"created": "Fri, 11 Jul 2014 10:40:08 GMT",
"version": "v1"
}
] | 2015-01-15 | [
[
"Kanatchikov",
"I. V.",
""
]
] | Precanonical quantization is based on the mathematical structures of the De Donder-Weyl Hamiltonization of field theories. The resulting formulation of quantum gravity describes the quantum geometry of space-time in terms of operator-valued distances and the transition amplitudes between the values of spin connection a... |
gr-qc/0005078 | Robert Beig | Robert Beig | The maximal slicing of a Schwarzschild black hole | 4 pages, LaTeX, uses Annalen der Physik "annalen" style | Annalen Phys. 11 (2000) 507-510 | null | null | gr-qc | null | We describe recent work due to Niall \'O Murchadha and the author (Phys. Rev.
D57, 4728 (1998)) on the late time behaviour of the maximal foliation of the
extended Schwarzschild geometry which results from evolving a time symmetric
slice into the past and future, with time running equally fast at both spatial
ends of... | [
{
"created": "Wed, 17 May 2000 13:30:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beig",
"Robert",
""
]
] | We describe recent work due to Niall \'O Murchadha and the author (Phys. Rev. D57, 4728 (1998)) on the late time behaviour of the maximal foliation of the extended Schwarzschild geometry which results from evolving a time symmetric slice into the past and future, with time running equally fast at both spatial ends of t... |
gr-qc/0204081 | Thomas W. Kephart | Thomas W. Kephart and Y. Jack Ng | Black Holes, Mergers, and the Entropy Budget of the Universe | null | JCAP 0311 (2003) 011 | 10.1088/1475-7516/2003/11/011 | null | gr-qc | null | Vast amounts of entropy are produced in black hole formation, and the amount
of entropy stored in supermassive black holes at the centers of galaxies is now
much greater than the entropy free in the rest of the universe. Either mergers
involved in forming supermassive black holes are rare,or the holes must be very
ef... | [
{
"created": "Fri, 26 Apr 2002 17:52:17 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Kephart",
"Thomas W.",
""
],
[
"Ng",
"Y. Jack",
""
]
] | Vast amounts of entropy are produced in black hole formation, and the amount of entropy stored in supermassive black holes at the centers of galaxies is now much greater than the entropy free in the rest of the universe. Either mergers involved in forming supermassive black holes are rare,or the holes must be very effi... |
2105.14632 | A. S. Lemos | A. S. Lemos | Submillimeter constraints for non-Newtonian gravity from spectroscopy | 14 pages, 3 figures, version published in EPL | EPL 135 (2021) 11001 | 10.1209/0295-5075/135/11001 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we consider the Yukawa-type and power-type non-Newtonian
corrections, which induce amplification of gravitational interaction on
submillimeter scales, and analytically calculate deviations produced by the
atomic gravitational field on the energy levels of hydrogen-like ions.
Analyzing ionic transitions ... | [
{
"created": "Sun, 30 May 2021 21:50:54 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Sep 2021 18:13:12 GMT",
"version": "v2"
}
] | 2021-09-29 | [
[
"Lemos",
"A. S.",
""
]
] | In this work, we consider the Yukawa-type and power-type non-Newtonian corrections, which induce amplification of gravitational interaction on submillimeter scales, and analytically calculate deviations produced by the atomic gravitational field on the energy levels of hydrogen-like ions. Analyzing ionic transitions be... |
gr-qc/9511037 | Kim Sang Pyo | Sang Pyo Kim (Department of Physics, Kunsan National University,
Kunsan, Korea) | Unitarity Condition on Quantum Fields in Semiclassical Gravity | 11 pages of Latex file, Revtex | Phys.Lett. A205 (1995) 359 | 10.1016/0375-9601(95)00584-P | KNU-TH26(Mar, 1995) | gr-qc | null | The condition for the unitarity of a quantum field is investigated in
semiclassical gravity from the Wheeler-DeWitt equation. It is found that the
quantum field preserves unitarity asymptotically in the Lorentzian universe,
but does not preserve unitarity completely in the Euclidean universe. In
particular we obtain ... | [
{
"created": "Mon, 13 Nov 1995 07:36:06 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kim",
"Sang Pyo",
"",
"Department of Physics, Kunsan National University,\n Kunsan, Korea"
]
] | The condition for the unitarity of a quantum field is investigated in semiclassical gravity from the Wheeler-DeWitt equation. It is found that the quantum field preserves unitarity asymptotically in the Lorentzian universe, but does not preserve unitarity completely in the Euclidean universe. In particular we obtain a ... |
gr-qc/9908028 | Haret Rosu | H.C. Rosu, J. Socorro | Ermakov approach for minisuperspace oscillators | 4 LaTex pages, ICSSUR 6 talk by H.C. Rosu, to be published in the
NASA/CP series, some mathematical misprints corrected | Int.J.Theor.Phys. 41 (2002) 39-43 | null | null | gr-qc quant-ph | null | The WDW equation of arbitrary Hartle-Hawking factor ordering for several
minisuperspace universe models, such as the pure gravity FRW and Taub ones, is
mapped onto the dynamics of corresponding classical oscillators. The latter
ones are studied by the classical Ermakov invariant method, which is a natural
aproach in ... | [
{
"created": "Mon, 9 Aug 1999 19:00:12 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Nov 1999 01:17:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rosu",
"H. C.",
""
],
[
"Socorro",
"J.",
""
]
] | The WDW equation of arbitrary Hartle-Hawking factor ordering for several minisuperspace universe models, such as the pure gravity FRW and Taub ones, is mapped onto the dynamics of corresponding classical oscillators. The latter ones are studied by the classical Ermakov invariant method, which is a natural aproach in th... |
gr-qc/0701107 | Roland Triay | Roland Triay (CPT), Henri-Hugues Fliche (LMMT) | Euler-Poisson-Newton approach in Cosmology | 15 pages, 1 figure | XII Brazilian School of Cosmology and Gravitation, Br\'{e}sil
(11/09/2006) | 10.1063/1.2752485 | CPT-P03-2007 | gr-qc astro-ph | null | This lecture provides us with Newtonian approaches for the interpretation of
two puzzling cosmological observations that are still discussed subject : a
bulk flow and a foam like structure in the distribution of galaxies. For the
first one, we model the motions describing all planar distortions from Hubble
flow, in a... | [
{
"created": "Fri, 19 Jan 2007 07:44:30 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Triay",
"Roland",
"",
"CPT"
],
[
"Fliche",
"Henri-Hugues",
"",
"LMMT"
]
] | This lecture provides us with Newtonian approaches for the interpretation of two puzzling cosmological observations that are still discussed subject : a bulk flow and a foam like structure in the distribution of galaxies. For the first one, we model the motions describing all planar distortions from Hubble flow, in add... |
gr-qc/0510107 | Kirill Bronnikov | K.A. Bronnikov and S.G. Rubin | Self-stabilization of extra dimensions | 10 pages, 4 figures, revtex4. Version with additions and corrections,
accepted at Phys. Rev. D | Phys.Rev. D73 (2006) 124019 | 10.1103/PhysRevD.73.124019 | null | gr-qc hep-th | null | We show that the problem of stabilization of extra dimensions in Kaluza-Klein
type cosmology may be solved in a theory of gravity involving high-order
curvature invariants. The method suggested (employing a slow-change
approximation) can work with rather a general form of the gravitational action.
As examples, we con... | [
{
"created": "Tue, 25 Oct 2005 16:30:52 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jul 2006 18:00:26 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Rubin",
"S. G.",
""
]
] | We show that the problem of stabilization of extra dimensions in Kaluza-Klein type cosmology may be solved in a theory of gravity involving high-order curvature invariants. The method suggested (employing a slow-change approximation) can work with rather a general form of the gravitational action. As examples, we consi... |
1608.01341 | Felipe Faria | F. F. Faria | Reply to "Comment on 'Quantum massive conformal gravity' by F. F. Faria" | v2: 2 pages, completely different version, match the published
version | Eur. Phys. J. C (2017) 77:11 | 10.1140/epjc/s10052-016-4543-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently in (Eur. Phys. J. C 76:341, 2016) [arXiv:1604.08706], Myung has
suggested that the renormalizability of massive conformal gravity is
meaningless unless the massive ghost states of the theory are stable. Here we
show that massive conformal gravity can be renormalizable having unstable ghost
states.
| [
{
"created": "Wed, 3 Aug 2016 20:27:09 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Jan 2017 20:45:04 GMT",
"version": "v2"
}
] | 2017-02-01 | [
[
"Faria",
"F. F.",
""
]
] | Recently in (Eur. Phys. J. C 76:341, 2016) [arXiv:1604.08706], Myung has suggested that the renormalizability of massive conformal gravity is meaningless unless the massive ghost states of the theory are stable. Here we show that massive conformal gravity can be renormalizable having unstable ghost states. |
2009.08086 | Norichika Sago | Norichika Sago, Takahiro Tanaka | Gravitational wave echoes induced by a point mass plunging to a black
hole | 22 pages, 8 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the possibility of detecting gravitational wave echoes in the data
stream subsequent to the binary black hole mergers observed by LIGO was
suggested. Motivated by this suggestion, we presented templates of echoes based
on black hole perturbations in our previous work. There, we assumed that the
incident wav... | [
{
"created": "Thu, 17 Sep 2020 06:02:39 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2020 03:16:04 GMT",
"version": "v2"
}
] | 2020-10-02 | [
[
"Sago",
"Norichika",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | Recently, the possibility of detecting gravitational wave echoes in the data stream subsequent to the binary black hole mergers observed by LIGO was suggested. Motivated by this suggestion, we presented templates of echoes based on black hole perturbations in our previous work. There, we assumed that the incident waves... |
gr-qc/9609014 | Alan Gray Wiseman | Dong Lai and Alan G. Wiseman (Caltech) | Innermost Stable Circular Orbit of Inspiraling Neutron-Star Binaries:
Tidal Effects, Post-Newtonian Effects and the Neutron-Star Equation of State | RevTeX, to appear in PRD, 8 pages, 4 figures included | Phys.Rev. D54 (1996) 3958-3964 | 10.1103/PhysRevD.54.3958 | GRP-444 | gr-qc astro-ph | null | We study how the neutron-star equation of state affects the onset of the
dynamical instability in the equations of motion for inspiraling neutron-star
binaries near coalescence. A combination of relativistic effects and Newtonian
tidal effects cause the stars to begin their final, rapid, and
dynamically-unstable plun... | [
{
"created": "Thu, 5 Sep 1996 07:10:10 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Lai",
"Dong",
"",
"Caltech"
],
[
"Wiseman",
"Alan G.",
"",
"Caltech"
]
] | We study how the neutron-star equation of state affects the onset of the dynamical instability in the equations of motion for inspiraling neutron-star binaries near coalescence. A combination of relativistic effects and Newtonian tidal effects cause the stars to begin their final, rapid, and dynamically-unstable plunge... |
1506.01248 | Yen Chin Ong | Brett McInnes, Yen Chin Ong | A Note on Physical Mass and the Thermodynamics of AdS-Kerr Black Holes | Improved discussion, references added, 12 pages, published version | JCAP 11 (2015) 004 | 10.1088/1475-7516/2015/11/004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As with any black hole, asymptotically anti-de Sitter Kerr black holes are
described by a small number of parameters, including a "mass parameter" $M$
that reduces to the AdS-Schwarzschild mass in the limit of vanishing angular
momentum. In sharp contrast to the asymptotically flat case, the horizon area
of such a bl... | [
{
"created": "Wed, 3 Jun 2015 14:02:26 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Nov 2015 15:51:11 GMT",
"version": "v2"
}
] | 2015-11-10 | [
[
"McInnes",
"Brett",
""
],
[
"Ong",
"Yen Chin",
""
]
] | As with any black hole, asymptotically anti-de Sitter Kerr black holes are described by a small number of parameters, including a "mass parameter" $M$ that reduces to the AdS-Schwarzschild mass in the limit of vanishing angular momentum. In sharp contrast to the asymptotically flat case, the horizon area of such a blac... |
gr-qc/0010095 | Jose M. M. Senovilla | Jose M M Senovilla | General Electric-Magnetic decomposition of fields, positivity and
Rainich-like conditions | 20 pages, no figures, plenary talks given at the Spanish Relativity
Meeting 2000, to be publisehd in the Proceedings of ERE-00 Some minor errors
corrected, one formula and acknowledgements added | null | 10.1142/9789812810021_0011 | null | gr-qc | null | We show how to generalize the classical electric-magnetic decomposition of
the Maxwell or the Weyl tensors to arbitrary fields described by tensors of any
rank in general $n$-dimensional spacetimes of Lorentzian signature. The
properties and applications of this decomposition are reviewed. In particular,
the definiti... | [
{
"created": "Wed, 25 Oct 2000 17:45:53 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Oct 2000 18:41:09 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Senovilla",
"Jose M M",
""
]
] | We show how to generalize the classical electric-magnetic decomposition of the Maxwell or the Weyl tensors to arbitrary fields described by tensors of any rank in general $n$-dimensional spacetimes of Lorentzian signature. The properties and applications of this decomposition are reviewed. In particular, the definition... |
2108.11083 | Subhra Bhattacharya | Subhra Bhattacharya | Mimicking the $\Lambda$CDM Universe through inhomogeneous space-time | Under review | Annl. Phys., 450, 169238 (2023) | 10.1016/j.aop.2023.169238 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from an inhomogeneous space-time model of the universe we could
recreate a scenario of recent time accelerating universe dominated by Dark
Energy type of fluid. The background matter component of such a universe was
considered to be made up of a combination of an anisotropic fluid, a barotropic
fluid and the... | [
{
"created": "Wed, 25 Aug 2021 07:04:44 GMT",
"version": "v1"
}
] | 2023-02-06 | [
[
"Bhattacharya",
"Subhra",
""
]
] | Starting from an inhomogeneous space-time model of the universe we could recreate a scenario of recent time accelerating universe dominated by Dark Energy type of fluid. The background matter component of such a universe was considered to be made up of a combination of an anisotropic fluid, a barotropic fluid and the p... |
gr-qc/0511056 | Iosif Khriplovich | I.B. Khriplovich and G.Yu. Ruban | Quasinormal modes for arbitrary spins in the Schwarzschild background | 14 pages, 2 figures; arguments improved, no results changed; 2
references added | Int.J.Mod.Phys. D15 (2006) 879-894 | 10.1142/S0218271806008620 | null | gr-qc hep-th | null | The leading term of the asymptotic of quasinormal modes in the Schwarzschild
background, omega_n = - i n/2, is obtained in two straightforward analytical
ways for arbitrary spins. One of these approaches requires almost no
calculations. As simply we demonstrate that for any odd integer spin, described
by the Teukolsk... | [
{
"created": "Fri, 11 Nov 2005 05:13:39 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2006 11:25:53 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Khriplovich",
"I. B.",
""
],
[
"Ruban",
"G. Yu.",
""
]
] | The leading term of the asymptotic of quasinormal modes in the Schwarzschild background, omega_n = - i n/2, is obtained in two straightforward analytical ways for arbitrary spins. One of these approaches requires almost no calculations. As simply we demonstrate that for any odd integer spin, described by the Teukolsky ... |
2008.13520 | Adrian Boitier | Adrian Bo\^itier, Shubhanshu Tiwari, Lionel Philippoz, Philippe Jetzer | Pulse redshift of pulsar timing array signals for all possible
gravitational wave polarizations in modified general relativity | Accepted for publication in PRD | null | 10.1103/PhysRevD.102.064051 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pulsar timing arrays (PTA) have the promise to detect gravitational waves
(GWs) from sources which are in a unique frequency range of 10^-9 - 10^-6 Hz.
This in turn also provides an opportunity to test the theory of general
relativity in the low frequency regime. The central concept of the detection of
GWs with PTA l... | [
{
"created": "Fri, 28 Aug 2020 13:38:02 GMT",
"version": "v1"
}
] | 2020-10-07 | [
[
"Boîtier",
"Adrian",
""
],
[
"Tiwari",
"Shubhanshu",
""
],
[
"Philippoz",
"Lionel",
""
],
[
"Jetzer",
"Philippe",
""
]
] | Pulsar timing arrays (PTA) have the promise to detect gravitational waves (GWs) from sources which are in a unique frequency range of 10^-9 - 10^-6 Hz. This in turn also provides an opportunity to test the theory of general relativity in the low frequency regime. The central concept of the detection of GWs with PTA lie... |
2206.07577 | Deng Wang | Deng Wang | Black Hole Olympics: Metric Selection from the Event Horizon Telescope
and LIGO-VIRGO Observations | 5.5 pages, 2 figures | null | null | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new paradigm in the field of black hole physics, i.e., with more
and more high precision observations, one must make a metric selection to
determine which black hole is observationally preferred. In light of the shadow
imaging data from the Event Horizon Telescope and gravitational wave
measurements from... | [
{
"created": "Wed, 15 Jun 2022 15:02:48 GMT",
"version": "v1"
}
] | 2022-06-16 | [
[
"Wang",
"Deng",
""
]
] | We propose a new paradigm in the field of black hole physics, i.e., with more and more high precision observations, one must make a metric selection to determine which black hole is observationally preferred. In light of the shadow imaging data from the Event Horizon Telescope and gravitational wave measurements from t... |
1502.00953 | Piyali Bhar | Piyali Bhar, Farook Rahaman, Ritabrata Biswas and U. F. Mondal | Particles and scalar waves in noncommutative charged black hole
spacetime | 12 pages, 8 figures, Accepted in Commun. Theor. Phys | Commun. Theor. Phys. 64 (2015) 1-8 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have discussed geodesics and the motion of test particle in
the gravitational field of noncommutative charged black hole spacetime. The
motion of massive and massless particle have been discussed seperately. A
comparative study of noncommutative charged black hole and usual
Reissner-Nordstrom black ... | [
{
"created": "Fri, 30 Jan 2015 04:03:41 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2015 20:06:40 GMT",
"version": "v2"
}
] | 2015-07-14 | [
[
"Bhar",
"Piyali",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Biswas",
"Ritabrata",
""
],
[
"Mondal",
"U. F.",
""
]
] | In this paper we have discussed geodesics and the motion of test particle in the gravitational field of noncommutative charged black hole spacetime. The motion of massive and massless particle have been discussed seperately. A comparative study of noncommutative charged black hole and usual Reissner-Nordstrom black ho... |
1312.4969 | Shahar Hod | Shahar Hod | The gravitational two-body problem in the vicinity of the light ring:
Insights from the black-hole-ring toy model | 9 pages | Physics Letters B 726, 533 (2013) | 10.1016/j.physletb.2013.08.070 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The physical properties of an axisymmetric black-hole-ring system are studied
analytically within the framework of general relativity to second order in the
dimensionless mass ratio $\mu\equiv m/M$. In particular, we analyze the
asymptotic behaviors of the binding-energy and the total angular-momentum of
the two-body... | [
{
"created": "Tue, 17 Dec 2013 21:01:54 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Hod",
"Shahar",
""
]
] | The physical properties of an axisymmetric black-hole-ring system are studied analytically within the framework of general relativity to second order in the dimensionless mass ratio $\mu\equiv m/M$. In particular, we analyze the asymptotic behaviors of the binding-energy and the total angular-momentum of the two-body s... |
0806.0665 | Craig J. Hogan | Craig J. Hogan | Indeterminacy of Holographic Quantum Geometry | 4 pages, LaTeX. Considerably shortened from earlier version.
Conclusions are unchanged. Submitted to PRD | Phys.Rev.D78:087501,2008 | 10.1103/PhysRevD.78.087501 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An effective theory based on wave optics is used to describe indeterminacy of
position in holographic spacetime with a UV cutoff at the Planck scale.
Wavefunctions describing spacetime positions are modeled as complex
disturbances of quasi-monochromatic radiation. It is shown that the product of
standard deviations o... | [
{
"created": "Wed, 4 Jun 2008 00:34:45 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2008 21:04:51 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Sep 2008 21:07:55 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Hogan",
"Craig J.",
""
]
] | An effective theory based on wave optics is used to describe indeterminacy of position in holographic spacetime with a UV cutoff at the Planck scale. Wavefunctions describing spacetime positions are modeled as complex disturbances of quasi-monochromatic radiation. It is shown that the product of standard deviations of ... |
2112.09048 | Yannick Herfray | Yannick Herfray | Carrollian manifolds and null infinity: A view from Cartan geometry | 27 pages + refs, 1 figure, 4 tables summarizing results. This version
co\"incides with the published version. As suggested by the reviewers, the
article is not presented as a review anymore to emphasise the original
material | null | 10.1088/1361-6382/ac635f | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We discuss three different (conformally) Carrollian geometries and their
relation to null infinity from the unifying perspective of Cartan geometry.
Null infinity \emph{per se} comes with numerous redundancies in its intrinsic
geometry and the two other Carrollian geometries can be recovered by making
successive choi... | [
{
"created": "Thu, 16 Dec 2021 17:37:43 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Sep 2022 14:46:49 GMT",
"version": "v2"
}
] | 2022-09-12 | [
[
"Herfray",
"Yannick",
""
]
] | We discuss three different (conformally) Carrollian geometries and their relation to null infinity from the unifying perspective of Cartan geometry. Null infinity \emph{per se} comes with numerous redundancies in its intrinsic geometry and the two other Carrollian geometries can be recovered by making successive choice... |
1809.00474 | Li Tang | Xin Li, Li Tang, Hai-Nan Lin, Li-Li Wang | Testing the variation of the fine structure constant with strongly
lensed gravitational waves | 5 pages,0 figures | Chinese Physics C 42 (2018) | 10.1088/1674-1137/42/9/095104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible variation of the electromagnetic fine structure constant
$\alpha_e$ on cosmological scales arouses great interests in recent years. The
strongly lensed gravitational waves and the electromagnetic counterparts could
be used to test this variation. Under the assumption that the speed of photon
could be mod... | [
{
"created": "Mon, 3 Sep 2018 07:35:24 GMT",
"version": "v1"
}
] | 2018-09-05 | [
[
"Li",
"Xin",
""
],
[
"Tang",
"Li",
""
],
[
"Lin",
"Hai-Nan",
""
],
[
"Wang",
"Li-Li",
""
]
] | The possible variation of the electromagnetic fine structure constant $\alpha_e$ on cosmological scales arouses great interests in recent years. The strongly lensed gravitational waves and the electromagnetic counterparts could be used to test this variation. Under the assumption that the speed of photon could be modif... |
1206.0306 | Yurii V. Dumin | Yurii V. Dumin (Sternberg Astronomical Institute (GAISh), Lomonosov
Moscow State University and Space Research Institute (IKI), Russian Academy
of Sciences) | Lambda Perturbations of Keplerian Orbits | REVTeX4, 17 pages, 2 EPS figures; v2: text substantially extended,
new formulas added | null | null | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To estimate influence of the "dark energy" on the Keplerian orbits, we solve
the general relativistic equations of motion of a test particle in the field of
a point-like mass embedded in the cosmological background formed by the
Lambda-term with realistic cosmological Robertson-Walker asymptotics at
infinity. It is f... | [
{
"created": "Fri, 1 Jun 2012 21:02:19 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Apr 2017 22:55:25 GMT",
"version": "v2"
}
] | 2017-04-18 | [
[
"Dumin",
"Yurii V.",
"",
"Sternberg Astronomical Institute"
]
] | To estimate influence of the "dark energy" on the Keplerian orbits, we solve the general relativistic equations of motion of a test particle in the field of a point-like mass embedded in the cosmological background formed by the Lambda-term with realistic cosmological Robertson-Walker asymptotics at infinity. It is fou... |
gr-qc/9505038 | Maria Bento | M.C. Bento and O. Bertolami | String Theory and Cosmology | 7 pages, plain Tex, no figures | Gen.Rel.Grav. 28 (1996) 565-572 | 10.1007/BF02105066 | CERN-TH/95-36, DFTT 20/95 | gr-qc | null | We discuss the main cosmological implications of considering string-loop
effects and a potential for the dilaton in the lowest order string effective
action. Our framework is based on the effective model arising from regarding
homogeneous and isotropic dilaton, metric and Yang-Mills field configurations.
The issues o... | [
{
"created": "Mon, 22 May 1995 10:40:11 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bento",
"M. C.",
""
],
[
"Bertolami",
"O.",
""
]
] | We discuss the main cosmological implications of considering string-loop effects and a potential for the dilaton in the lowest order string effective action. Our framework is based on the effective model arising from regarding homogeneous and isotropic dilaton, metric and Yang-Mills field configurations. The issues of ... |
1909.05816 | Frans Klinkhamer | F.R. Klinkhamer, E. Ling | Model for a time-symmetric Milne-like universe without big bang
curvature singularity | 16 pages, 4 figures, v3: two appendices added on the thermodynamic
arrow of time | null | null | KA-TP-18-2019 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a physics model for a time-symmetric Milne-like universe. The
model is based on the $q$-theory approach to the cosmological constant problem,
supplemented by an assumed vacuum-matter energy exchange possibly due to
quantum-dissipative effects. Without fine-tuning of the initial vacuum energy
density, we ob... | [
{
"created": "Thu, 12 Sep 2019 17:20:42 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2019 14:29:40 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Oct 2019 15:55:39 GMT",
"version": "v3"
}
] | 2019-10-15 | [
[
"Klinkhamer",
"F. R.",
""
],
[
"Ling",
"E.",
""
]
] | We present a physics model for a time-symmetric Milne-like universe. The model is based on the $q$-theory approach to the cosmological constant problem, supplemented by an assumed vacuum-matter energy exchange possibly due to quantum-dissipative effects. Without fine-tuning of the initial vacuum energy density, we obta... |
gr-qc/0405083 | Maurizio Gasperini | M. Gasperini | Towards a future singularity? | 8 pages. Essay written for the "2004 Awards for Essays on
Gravitation" (Gravity Research Foundation, Wellesley Hills, MA, USA), and
selected for "Honorable Mention" | Int.J.Mod.Phys. D13 (2004) 2267-2274 | 10.1142/S0218271804006310 | BA-TH/04-478, February 2004 | gr-qc astro-ph hep-th | null | We discuss whether the future extrapolation of the present cosmological state
may lead to a singularity even in case of "conventional" (negative) pressure of
the dark energy field, namely $w=p/\rho \geq -1$. The discussion is based on an
often neglected aspect of scalar-tensor models of gravity: the fact that
differe... | [
{
"created": "Sun, 16 May 2004 14:15:35 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gasperini",
"M.",
""
]
] | We discuss whether the future extrapolation of the present cosmological state may lead to a singularity even in case of "conventional" (negative) pressure of the dark energy field, namely $w=p/\rho \geq -1$. The discussion is based on an often neglected aspect of scalar-tensor models of gravity: the fact that different... |
gr-qc/0510044 | Michel Leclerc | M. Leclerc | Canonical and gravitational stress-energy tensors | final version, to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D15 (2006) 959-990 | 10.1142/S0218271806008693 | null | gr-qc | null | It is dealt with the question, under which circumstances the canonical
Noether stress-energy tensor is equivalent to the gravitational (Hilbert)
tensor for general matter fields under the influence of gravity. In the
framework of general relativity, the full equivalence is established for matter
fields that do not co... | [
{
"created": "Sun, 9 Oct 2005 19:24:10 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 2005 18:11:41 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Nov 2005 20:08:27 GMT",
"version": "v3"
},
{
"created": "Thu, 12 Jan 2006 16:19:50 GMT",
"version": "v4"
},
{
"cr... | 2009-11-11 | [
[
"Leclerc",
"M.",
""
]
] | It is dealt with the question, under which circumstances the canonical Noether stress-energy tensor is equivalent to the gravitational (Hilbert) tensor for general matter fields under the influence of gravity. In the framework of general relativity, the full equivalence is established for matter fields that do not coup... |
2308.15497 | J\'unior Diniz Toniato | Felipe S. Esc\'orcio, J\'ulio C. Fabris, J\'unior D. Toniato, Hermano
Velten | Celestial mechanics in Newtonian-like gravity with variable $G$ | 11 pages, 4 figures, version matching the one published in EPJP | Eur. Phys. J. Plus 138, 1084 (2023) | 10.1140/epjp/s13360-023-04729-0 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Newtonian-like theory inspired by the Brans-Dicke gravitational Lagrangian
has been recently proposed in Ref. arXiv:2009.04434(v4). This work demonstrates
that the modified gravitational force acting on a test particle is analogous to
that derived from the Manev potential. Specifically, an additional term
$\propto ... | [
{
"created": "Mon, 28 Aug 2023 19:57:23 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 2024 17:43:00 GMT",
"version": "v2"
}
] | 2024-02-22 | [
[
"Escórcio",
"Felipe S.",
""
],
[
"Fabris",
"Júlio C.",
""
],
[
"Toniato",
"Júnior D.",
""
],
[
"Velten",
"Hermano",
""
]
] | A Newtonian-like theory inspired by the Brans-Dicke gravitational Lagrangian has been recently proposed in Ref. arXiv:2009.04434(v4). This work demonstrates that the modified gravitational force acting on a test particle is analogous to that derived from the Manev potential. Specifically, an additional term $\propto r^... |
gr-qc/9809060 | Stu Shapiro | Stuart L. Shapiro | Head-On Collision of Neutron Stars As A Thought Experiment | to appear in Physical Review D (revtex, 3 figs, 5 pgs) | Phys.Rev. D58 (1998) 103002 | 10.1103/PhysRevD.58.103002 | null | gr-qc astro-ph | null | The head-on collision of identical neutron stars from rest at infinity
requires a numerical simulation in full general relativity for a complete
solution. Undaunted, we provide a relativistic, analytic argument to suggest
that during the collision, sufficient thermal pressure is always generated to
support the hot re... | [
{
"created": "Fri, 18 Sep 1998 18:37:10 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Shapiro",
"Stuart L.",
""
]
] | The head-on collision of identical neutron stars from rest at infinity requires a numerical simulation in full general relativity for a complete solution. Undaunted, we provide a relativistic, analytic argument to suggest that during the collision, sufficient thermal pressure is always generated to support the hot remn... |
1703.00305 | Konstantinos Dimopoulos | Konstantinos Dimopoulos and Charlotte Owen | Quintessential Inflation with $\alpha$-attractors | 21 pages, 4 figures, published version | null | 10.1088/1475-7516/2017/06/027 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel approach to quintessential inflation model building is studied,
within the framework of $\alpha$-attractors, motivated by supergravity
theories. Inflationary observables are in excellent agreement with the latest
CMB observations, while quintessence explains the dark energy observations
without any fine-tunin... | [
{
"created": "Tue, 28 Feb 2017 16:22:53 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2017 11:44:29 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Jun 2017 14:48:33 GMT",
"version": "v3"
}
] | 2017-06-23 | [
[
"Dimopoulos",
"Konstantinos",
""
],
[
"Owen",
"Charlotte",
""
]
] | A novel approach to quintessential inflation model building is studied, within the framework of $\alpha$-attractors, motivated by supergravity theories. Inflationary observables are in excellent agreement with the latest CMB observations, while quintessence explains the dark energy observations without any fine-tuning.... |
2203.00085 | Seth A. Major | Seth A. Major | On energy for accelerating observers in black hole spacetimes | Comments welcome. v2: description of the approach and derivation
clarified. v3: updated referencing, typos corrected, close to published
version | null | 10.1103/PhysRevD.105.104050 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Quasi-local energies for constantly accelerating observers in Ba\~nados,
Teitelboim, and Zanelli (BTZ), Schwarzschild and Schwarzschild-de Sitter
spacetimes are derived. The energies are expressed in terms of acceleration,
cosmological constant, and area, quantities measurable by the observers. Based
on results from ... | [
{
"created": "Mon, 28 Feb 2022 20:43:11 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2022 19:43:48 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jul 2022 17:32:59 GMT",
"version": "v3"
}
] | 2022-07-06 | [
[
"Major",
"Seth A.",
""
]
] | Quasi-local energies for constantly accelerating observers in Ba\~nados, Teitelboim, and Zanelli (BTZ), Schwarzschild and Schwarzschild-de Sitter spacetimes are derived. The energies are expressed in terms of acceleration, cosmological constant, and area, quantities measurable by the observers. Based on results from qu... |
2004.05045 | Yu-Hsien Kung | Hsu-Wen Chiang, Yu-Hsien Kung, Pisin Chen | Modification to the Hawking temperature of a dynamical black hole by a
flow-induced supertranslation | null | J. High Energ. Phys. 2020, 89 (2020) | 10.1007/JHEP12(2020)089 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One interesting proposal to solve the black hole information loss paradox
without modifying either general relativity or quantum field theory, is the
soft hair, a diffeomorphism charge that records the anisotropic radiation in
the asymptotic region. This proposal, however, has been challenged, given that
away from th... | [
{
"created": "Fri, 10 Apr 2020 14:14:09 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2020 06:53:38 GMT",
"version": "v2"
},
{
"created": "Mon, 11 May 2020 01:50:28 GMT",
"version": "v3"
},
{
"created": "Mon, 6 Jul 2020 10:30:21 GMT",
"version": "v4"
}
] | 2020-12-16 | [
[
"Chiang",
"Hsu-Wen",
""
],
[
"Kung",
"Yu-Hsien",
""
],
[
"Chen",
"Pisin",
""
]
] | One interesting proposal to solve the black hole information loss paradox without modifying either general relativity or quantum field theory, is the soft hair, a diffeomorphism charge that records the anisotropic radiation in the asymptotic region. This proposal, however, has been challenged, given that away from the ... |
gr-qc/9911106 | Jeffrey Winicour | Jeffrey Winicour | The characteristic treatment of black holes | null | Prog.Theor.Phys.Suppl.136:57-71,1999 | 10.1143/PTPS.136.57 | null | gr-qc | null | The characteristic initial value problem has been implemented as a robust
computational algorithm (the PITT NULL CODE), with direct application to binary
black holes. The event horizon can be analyzed by characteristic techniques as
a stand-alone object using an analytic conformal model which gives new insight
into t... | [
{
"created": "Fri, 26 Nov 1999 13:17:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Winicour",
"Jeffrey",
""
]
] | The characteristic initial value problem has been implemented as a robust computational algorithm (the PITT NULL CODE), with direct application to binary black holes. The event horizon can be analyzed by characteristic techniques as a stand-alone object using an analytic conformal model which gives new insight into the... |
1610.00357 | Nelson Nunes | Tiago Barreiro, Ugo Bertello, Nelson J. Nunes | Screening three-form fields | 6 pages, 4 figures | null | 10.1016/j.physletb.2017.08.061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Screening mechanisms for a three-form field around a dense source such as the
Sun are investigated. Working with the dual vector, we can obtain a thin-shell
where field interactions are short range. The field outside the source adopts
the configuration of a dipole which is a manifestly distinct behaviour from the
one... | [
{
"created": "Sun, 2 Oct 2016 21:42:12 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Barreiro",
"Tiago",
""
],
[
"Bertello",
"Ugo",
""
],
[
"Nunes",
"Nelson J.",
""
]
] | Screening mechanisms for a three-form field around a dense source such as the Sun are investigated. Working with the dual vector, we can obtain a thin-shell where field interactions are short range. The field outside the source adopts the configuration of a dipole which is a manifestly distinct behaviour from the one o... |
2201.08854 | Rodrigo Vicente | Rodrigo Vicente, Vitor Cardoso | Dynamical friction of black holes in ultralight dark matter | 11 pages, 2 figures. Version to be published in Physical Review D | null | 10.1103/PhysRevD.105.083008 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work we derive simple closed-form expressions for the dynamical
friction acting on black holes moving through ultralight (scalar field) dark
matter, covering both non-relativistic and relativistic black hole speeds. Our
derivation is based on long known scattering amplitudes in black hole
spacetimes, it inclu... | [
{
"created": "Fri, 21 Jan 2022 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 21:39:44 GMT",
"version": "v2"
}
] | 2022-04-27 | [
[
"Vicente",
"Rodrigo",
""
],
[
"Cardoso",
"Vitor",
""
]
] | In this work we derive simple closed-form expressions for the dynamical friction acting on black holes moving through ultralight (scalar field) dark matter, covering both non-relativistic and relativistic black hole speeds. Our derivation is based on long known scattering amplitudes in black hole spacetimes, it include... |
1106.1264 | Mahmood Roshan | Mahmood Roshan and Fatimah Shojai | Notes on the post-Newtonian limit of massive Brans-Dicke theory | to appear in CQG | Class.Quant.Grav.28:145012,2011 | 10.1088/0264-9381/28/14/145012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Post-Newtonian limit of massive Brans-Dicke theory and we
make some notes about the Post-Newtonian limit of the case $\omega=0$. This
case is dynamically equivalent to the metric $f(R)$ theory. It is known that
this theory can be compatible with the solar system tests if Chameleon
mechanism occurs. Al... | [
{
"created": "Tue, 7 Jun 2011 06:56:18 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jun 2011 09:14:39 GMT",
"version": "v2"
}
] | 2011-11-10 | [
[
"Roshan",
"Mahmood",
""
],
[
"Shojai",
"Fatimah",
""
]
] | We consider the Post-Newtonian limit of massive Brans-Dicke theory and we make some notes about the Post-Newtonian limit of the case $\omega=0$. This case is dynamically equivalent to the metric $f(R)$ theory. It is known that this theory can be compatible with the solar system tests if Chameleon mechanism occurs. Also... |
1301.2578 | Ivan Jardim Carneiro | I. C. Jardim, R. R. Landim, G. Alencar, R. N. Costa Filho | Cosmologies of Multiple Spherical Brane-universe Model | 13 pages, 3 figures | Phys. Rev. D 88, 024004 (2013) | 10.1103/PhysRevD.88.024004 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Friedmann-Robertson-Walker metric with spherical topology is calculated
as an effective metric at the brane in a multiple branes in $D-$dimensional
spacetime scenario. In this model the radius of the brane is the cosmological
scale factor, and its evolution is calculated from the viewpoint of the
observers on the... | [
{
"created": "Fri, 11 Jan 2013 19:11:56 GMT",
"version": "v1"
}
] | 2013-07-04 | [
[
"Jardim",
"I. C.",
""
],
[
"Landim",
"R. R.",
""
],
[
"Alencar",
"G.",
""
],
[
"Filho",
"R. N. Costa",
""
]
] | The Friedmann-Robertson-Walker metric with spherical topology is calculated as an effective metric at the brane in a multiple branes in $D-$dimensional spacetime scenario. In this model the radius of the brane is the cosmological scale factor, and its evolution is calculated from the viewpoint of the observers on their... |
gr-qc/0507057 | Yasusada Nambu | Yasusada Nambu and Masayuki Tanimoto | Accelerating Universe via Spatial Averaging | 4 pages | null | null | DPNU-05-12 | gr-qc astro-ph | null | We present a model of an inhomogeneous universe that leads to accelerated
expansion after taking spatial averaging. The model universe is the
Tolman-Bondi solution of the Einstein equation and contains both a region with
positive spatial curvature and a region with negative spatial curvature. We
find that after the r... | [
{
"created": "Wed, 13 Jul 2005 23:59:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nambu",
"Yasusada",
""
],
[
"Tanimoto",
"Masayuki",
""
]
] | We present a model of an inhomogeneous universe that leads to accelerated expansion after taking spatial averaging. The model universe is the Tolman-Bondi solution of the Einstein equation and contains both a region with positive spatial curvature and a region with negative spatial curvature. We find that after the reg... |
0907.1034 | Claudio Dappiaggi | Claudio Dappiaggi, Valter Moretti, Nicola Pinamonti | Rigorous construction and Hadamard property of the Unruh state in
Schwarzschild spacetime | 63 pages, 3 figures | Advances in Theoretical and Mathematical Physics, Volume 15,
Number 2, 2011 | null | Desy 09-105, UTM 730, ZMP-HH/09-13 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of the radiation properties of black holes prompted the search
for a natural candidate quantum ground state for a massless scalar field theory
on Schwarzschild spacetime, here considered in the Eddington-Finkelstein
representation. Among the several available proposals in the literature, an
important ph... | [
{
"created": "Mon, 6 Jul 2009 16:19:47 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2012 14:08:58 GMT",
"version": "v2"
}
] | 2012-02-22 | [
[
"Dappiaggi",
"Claudio",
""
],
[
"Moretti",
"Valter",
""
],
[
"Pinamonti",
"Nicola",
""
]
] | The discovery of the radiation properties of black holes prompted the search for a natural candidate quantum ground state for a massless scalar field theory on Schwarzschild spacetime, here considered in the Eddington-Finkelstein representation. Among the several available proposals in the literature, an important phys... |
1612.00717 | Yueyang Zhang | Yueyang Zhang and Biping Gong | Test of Weak Equivalence Principle with the multi-band timing of the
Crab Pulsar | 5 pages. Accepted for publication in ApJ | null | 10.3847/1538-4357/aa61fb | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Weak Equivalent Principle (WEP) can be tested through the parameterized
post-Newtonian parameter $\gamma$, representing the space curvature produced by
unit rest mass. The parameter $\gamma$ in turn has been constrained by
comparing the arrival times of photons originating in distant transient events,
such as gamma-r... | [
{
"created": "Fri, 2 Dec 2016 15:56:20 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 12:05:34 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Dec 2016 04:01:33 GMT",
"version": "v3"
},
{
"created": "Fri, 17 Feb 2017 07:24:28 GMT",
"version": "v4"
}
] | 2017-03-22 | [
[
"Zhang",
"Yueyang",
""
],
[
"Gong",
"Biping",
""
]
] | Weak Equivalent Principle (WEP) can be tested through the parameterized post-Newtonian parameter $\gamma$, representing the space curvature produced by unit rest mass. The parameter $\gamma$ in turn has been constrained by comparing the arrival times of photons originating in distant transient events, such as gamma-ray... |
1302.5356 | She-Sheng Xue | Remo Ruffini and She-Sheng Xue | Gravitational and electric energies in the collapse of a spherical
thin-shell capacitor | 18 pages, 3 figures, the version to appear in Phys. Lett. A | PhysicsLetters A377 (2013) 2450 | 10.1016/j.physleta.2013.07.026 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We adopt a simplified model describing the collapse of a spherical thin-shell
capacitor to give an analytical description how gravitational energy is
converted to both kinetic and electric energies in the gravitational collapse.
It is shown that (i) averaged kinetic and electric energies are the same order,
about an ... | [
{
"created": "Thu, 21 Feb 2013 18:03:40 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2013 00:34:22 GMT",
"version": "v2"
}
] | 2015-09-10 | [
[
"Ruffini",
"Remo",
""
],
[
"Xue",
"She-Sheng",
""
]
] | We adopt a simplified model describing the collapse of a spherical thin-shell capacitor to give an analytical description how gravitational energy is converted to both kinetic and electric energies in the gravitational collapse. It is shown that (i) averaged kinetic and electric energies are the same order, about an ha... |
1311.4020 | Kaustubh Deshpande | Kaustubh Sudhir Deshpande | Action-at-a-distance electrodynamics in Quasi-steady-state cosmology | Section 4 added with supplementary calculation; 8 pages; 1 figure;
Communicated by Prof. J. V. Narlikar (IUCAA, Pune, India); Submitted to
Pramana (Journal of Physics published by Indian Academy of Sciences) on Sep
4, 2013 | Pramana (2014), Vol. 83, No. 3, 449-456 | 10.1007/s12043-014-0777-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Action-at-a-distance electrodynamics - alternative approach to field theory -
can be extended to cosmological models using conformal symmetry. An advantage
of this is that the origin of arrow of time in electromagnetism can be
attributed to the cosmological structure. Different cosmological models can be
investigated... | [
{
"created": "Sat, 16 Nov 2013 05:42:01 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2014 07:25:48 GMT",
"version": "v2"
}
] | 2014-11-07 | [
[
"Deshpande",
"Kaustubh Sudhir",
""
]
] | Action-at-a-distance electrodynamics - alternative approach to field theory - can be extended to cosmological models using conformal symmetry. An advantage of this is that the origin of arrow of time in electromagnetism can be attributed to the cosmological structure. Different cosmological models can be investigated, ... |
gr-qc/9507005 | null | Peter D. D'Eath and Giampiero Esposito | Spectral Boundary Conditions in One-Loop Quantum Cosmology | 29 pages, plain-tex, published in Physical Review D, volume 44, pages
1713-1721, year 1991 | Phys.Rev. D44 (1991) 1713-1721 | 10.1103/PhysRevD.44.1713 | DAMTP R-91/4 | gr-qc | null | For fermionic fields on a compact Riemannian manifold with boundary one has a
choice between local and non-local (spectral) boundary conditions. The one-loop
prefactor in the Hartle-Hawking amplitude in quantum cosmology can then be
studied using the generalized Riemann zeta-function formed from the squared
eigenvalu... | [
{
"created": "Tue, 4 Jul 1995 06:39:58 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"D'Eath",
"Peter D.",
""
],
[
"Esposito",
"Giampiero",
""
]
] | For fermionic fields on a compact Riemannian manifold with boundary one has a choice between local and non-local (spectral) boundary conditions. The one-loop prefactor in the Hartle-Hawking amplitude in quantum cosmology can then be studied using the generalized Riemann zeta-function formed from the squared eigenvalues... |
2407.08283 | Syed Moeez Hassan | Syed Moeez Hassan, Viqar Husain and Babar Qureshi | From global time to local physics | 18 pages, 5 figures. Comments welcome | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Global time is a gauge or relational choice of time variable in canonical
gravity. Local time is the time used in a flat patch of spacetime. We compare
the dynamics of a scalar field with respect to choices of global time and
Minkowski patch time in an expanding cosmology. Our main results are that
evolutions startin... | [
{
"created": "Thu, 11 Jul 2024 08:30:35 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Hassan",
"Syed Moeez",
""
],
[
"Husain",
"Viqar",
""
],
[
"Qureshi",
"Babar",
""
]
] | Global time is a gauge or relational choice of time variable in canonical gravity. Local time is the time used in a flat patch of spacetime. We compare the dynamics of a scalar field with respect to choices of global time and Minkowski patch time in an expanding cosmology. Our main results are that evolutions starting ... |
1201.6102 | Romesh K. Kaul | Romesh K. Kaul | Entropy of Quantum Black Holes | null | SIGMA 8 (2012), 005, 30 pages | 10.3842/SIGMA.2012.005 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | In the Loop Quantum Gravity, black holes (or even more general Isolated
Horizons) are described by a SU(2) Chern-Simons theory. There is an equivalent
formulation of the horizon degrees of freedom in terms of a U(1) gauge theory
which is just a gauged fixed version of the SU(2) theory. These developments
will be surv... | [
{
"created": "Mon, 30 Jan 2012 03:47:05 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Feb 2012 06:12:52 GMT",
"version": "v2"
}
] | 2012-02-09 | [
[
"Kaul",
"Romesh K.",
""
]
] | In the Loop Quantum Gravity, black holes (or even more general Isolated Horizons) are described by a SU(2) Chern-Simons theory. There is an equivalent formulation of the horizon degrees of freedom in terms of a U(1) gauge theory which is just a gauged fixed version of the SU(2) theory. These developments will be survey... |
gr-qc/9709002 | Madore | J. Madore | Gravity on Fuzzy Space-Time | ESI Preprint 478, 30 pages, Latex | null | null | null | gr-qc hep-th | null | A review is made of recent efforts to add a gravitational field to
noncommutative models of space-time. Special emphasis is placed on the case
which could be considered as the noncommutative analog of a parallelizable
space-time. It is argued that, at least in this case, there is a rigid relation
between the noncommu... | [
{
"created": "Sat, 30 Aug 1997 09:23:22 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Sep 1997 16:58:07 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Madore",
"J.",
""
]
] | A review is made of recent efforts to add a gravitational field to noncommutative models of space-time. Special emphasis is placed on the case which could be considered as the noncommutative analog of a parallelizable space-time. It is argued that, at least in this case, there is a rigid relation between the noncommuta... |
gr-qc/9607025 | Mr Blanchet Darc | Luc Blanchet | Gravitational radiation from relativistic sources | To appear in the Proceedings of the Les Houches School, 38 pages | null | null | null | gr-qc | null | 1. Introduction
2. Basics and outline of the method
2.1 Regions around an isolated source
2.2 The quadrupole formalism
2.3 Outline of the method
3. Properties of radiative gravitational fields
3.1 The field in the exterior domain (D_e)
3.2 Computing the field nonlinearities in (D_e)
3.3 The field in t... | [
{
"created": "Thu, 11 Jul 1996 08:25:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blanchet",
"Luc",
""
]
] | 1. Introduction 2. Basics and outline of the method 2.1 Regions around an isolated source 2.2 The quadrupole formalism 2.3 Outline of the method 3. Properties of radiative gravitational fields 3.1 The field in the exterior domain (D_e) 3.2 Computing the field nonlinearities in (D_e) 3.3 The field in the far wave zone D... |
gr-qc/0507092 | Muraari Vasudevan | Muraari Vasudevan | Integrability of Some Charged Rotating Supergravity Black Hole Solutions
in Four and Five Dimensions | 17 Pages, updated bibliography, accepted for publication by Physics
Letters B | Phys.Lett.B624:287-296,2005 | 10.1016/j.physletb.2005.08.026 | Alberta-Thy 09-05 | gr-qc hep-th math-ph math.MP | null | We study the integrability of geodesic flow in the background of some
recently discovered charged rotating solutions of supergravity in four and five
dimensions. Specifically, we work with the gauged multicharge
Taub-NUT-Kerr-(Anti) de Sitter metric in four dimensions, and the $U(1)^3$
gauged charged-Kerr-(Anti) de S... | [
{
"created": "Fri, 22 Jul 2005 07:05:07 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Aug 2005 08:43:06 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Aug 2005 21:30:24 GMT",
"version": "v3"
}
] | 2010-11-19 | [
[
"Vasudevan",
"Muraari",
""
]
] | We study the integrability of geodesic flow in the background of some recently discovered charged rotating solutions of supergravity in four and five dimensions. Specifically, we work with the gauged multicharge Taub-NUT-Kerr-(Anti) de Sitter metric in four dimensions, and the $U(1)^3$ gauged charged-Kerr-(Anti) de Sit... |
1810.08066 | Ahmadjon Abdujabbarov | Ahmadjon Abdujabbarov, Naresh Dadhich, Bobomurat Ahmedov | Electromagnetic field around boosted rotating black hole | 9 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact analytic solutions of the Maxwell equations in the exterior of a
boosted rotating black hole immersed in an external magnetic field are
obtained. The effect of boost as well as electromagnetic field on charged
particle motion and energy extraction process -- magnetic Penrose process
around black hole is stu... | [
{
"created": "Wed, 17 Oct 2018 09:21:47 GMT",
"version": "v1"
}
] | 2018-10-19 | [
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Dadhich",
"Naresh",
""
],
[
"Ahmedov",
"Bobomurat",
""
]
] | The exact analytic solutions of the Maxwell equations in the exterior of a boosted rotating black hole immersed in an external magnetic field are obtained. The effect of boost as well as electromagnetic field on charged particle motion and energy extraction process -- magnetic Penrose process around black hole is studi... |
gr-qc/9911056 | Maria Angeles Serrano Moral | M. Angeles Serrano and J. Alberto Lobo (U. de Barcelona) | Resonant Spheres: Multifrequency Detectors of Gravitational Waves | Submitted to Phys. Rev. Letters | null | null | null | gr-qc | null | We discuss the capabilities of spherical antenn\ae as single multifrequency
detectors of gravitational waves. A first order theory allows us to evaluate
the coupled spectrum and the resonators readouts when the first and the second
quadrupole bare sphere frequencies are simultaneously selected for layout
tuning. We s... | [
{
"created": "Mon, 15 Nov 1999 18:39:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Serrano",
"M. Angeles",
"",
"U. de Barcelona"
],
[
"Lobo",
"J. Alberto",
"",
"U. de Barcelona"
]
] | We discuss the capabilities of spherical antenn\ae as single multifrequency detectors of gravitational waves. A first order theory allows us to evaluate the coupled spectrum and the resonators readouts when the first and the second quadrupole bare sphere frequencies are simultaneously selected for layout tuning. We str... |
gr-qc/9902041 | Giulio Magli | S. Jhingan and G. Magli | Black holes vs. naked singularities formation in collapsing Einstein's
clusters | 13 pages, LaTeX format. To appear in Physical Review D | null | 10.1103/PhysRevD.61.124006 | null | gr-qc astro-ph | null | Non-static, spherically symmetric clusters of counter-rotating particles, of
the type first introduced by Einstein, are analysed here. The initial data
space can be parameterized in terms of three arbitrary functions, namely;
initial density, velocity and angular momentum profiles. The final state of
collapse, black ... | [
{
"created": "Fri, 12 Feb 1999 14:42:09 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2000 14:10:49 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Jhingan",
"S.",
""
],
[
"Magli",
"G.",
""
]
] | Non-static, spherically symmetric clusters of counter-rotating particles, of the type first introduced by Einstein, are analysed here. The initial data space can be parameterized in terms of three arbitrary functions, namely; initial density, velocity and angular momentum profiles. The final state of collapse, black ho... |
2403.16118 | Umananda Dev Goswami | Pranjal Sarmah and Umananda Dev Goswami | Dynamical system analysis of LRS-BI Universe with f(Q) gravity theory | 18 pages, 6 figures; Published version | Physics of the Dark Universe 46, 101556 (2024) | 10.1016/j.dark.2024.101556 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the Universe as a dynamic system, the understanding of its
evolution is an interesting aspect of study in cosmology. Here, we investigate
the anisotropic locally rotationally symmetric (LRS) Bianchi type-I (LRS-BI)
spacetime under the $f(Q)$ gravity of symmetric teleparallel theory equivalent
to the GR (S... | [
{
"created": "Sun, 24 Mar 2024 12:22:18 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2024 16:24:25 GMT",
"version": "v2"
}
] | 2024-06-21 | [
[
"Sarmah",
"Pranjal",
""
],
[
"Goswami",
"Umananda Dev",
""
]
] | Considering the Universe as a dynamic system, the understanding of its evolution is an interesting aspect of study in cosmology. Here, we investigate the anisotropic locally rotationally symmetric (LRS) Bianchi type-I (LRS-BI) spacetime under the $f(Q)$ gravity of symmetric teleparallel theory equivalent to the GR (STE... |
2302.05715 | Theodore Anton | Theodore Anton and Timothy Clifton | Modelling the emergence of cosmic anisotropy from non-linear structures | 33 pages, 8 figures. Typo corrected in Eq. (21) | Class. Quantum Grav. 40 145004 (2023) | 10.1088/1361-6382/acdbfd | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astronomical observations suggest that the Universe may be anisotropic on the
largest scales. In order to model this situation, we develop a new approach to
cosmology that allows for large-scale anisotropy to emerge from the growth of
non-linear structure. This is achieved by decomposing all relevant fields with
resp... | [
{
"created": "Sat, 11 Feb 2023 15:09:42 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2023 10:36:42 GMT",
"version": "v2"
}
] | 2023-06-26 | [
[
"Anton",
"Theodore",
""
],
[
"Clifton",
"Timothy",
""
]
] | Astronomical observations suggest that the Universe may be anisotropic on the largest scales. In order to model this situation, we develop a new approach to cosmology that allows for large-scale anisotropy to emerge from the growth of non-linear structure. This is achieved by decomposing all relevant fields with respec... |
1012.1406 | Hamid Reza Sepangi | A. S. Sefiedgar, K. Nozari and H. R. Sepangi | Modified dispersion relations in extra dimensions | 9 pages, to appear in PLB | Phys.Lett.B696:119-123,2011 | 10.1016/j.physletb.2010.11.067 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been shown that the thermodynamics of a FRW universe can be
fully derived using the generalized uncertainty principle (GUP) in extra
dimensions as a primary input. There is a phenomenologically close relation
between the GUP and Modified Dispersion Relations (MDR). However, the form of
the MDR in theo... | [
{
"created": "Tue, 7 Dec 2010 06:10:41 GMT",
"version": "v1"
}
] | 2011-02-28 | [
[
"Sefiedgar",
"A. S.",
""
],
[
"Nozari",
"K.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | It has recently been shown that the thermodynamics of a FRW universe can be fully derived using the generalized uncertainty principle (GUP) in extra dimensions as a primary input. There is a phenomenologically close relation between the GUP and Modified Dispersion Relations (MDR). However, the form of the MDR in theori... |
2306.11717 | Nihan Kat{\i}rc{\i} Dr. | \"Ozg\"ur Akarsu, Mariam Bouhmadi-L\'opez, Nihan Kat{\i}rc{\i}, Elham
Nazari, Mahmood Roshan, N. Merve Uzun | Equivalence of matter-type modified gravity theories to general
relativity with nonminimal matter interaction | 18 pages, 1 figure, no tables; matches the version to appear in
Physical Review D | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we first establish that gravity models incorporating
matter-related terms, such as $f(\mathcal{L}_{\rm m})$, $f(g_{\mu\nu}
T^{\mu\nu})$, and $f(T_{\mu\nu} T^{\mu\nu})$, into the usual matter Lagrangian
density $\mathcal{L}_{\rm m}$, are equivalent to general relativity with
nonminimal matter interactio... | [
{
"created": "Tue, 20 Jun 2023 17:52:32 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 2024 15:40:22 GMT",
"version": "v2"
}
] | 2024-04-12 | [
[
"Akarsu",
"Özgür",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Katırcı",
"Nihan",
""
],
[
"Nazari",
"Elham",
""
],
[
"Roshan",
"Mahmood",
""
],
[
"Uzun",
"N. Merve",
""
]
] | In this study, we first establish that gravity models incorporating matter-related terms, such as $f(\mathcal{L}_{\rm m})$, $f(g_{\mu\nu} T^{\mu\nu})$, and $f(T_{\mu\nu} T^{\mu\nu})$, into the usual matter Lagrangian density $\mathcal{L}_{\rm m}$, are equivalent to general relativity with nonminimal matter interactions... |
0912.5417 | Izumi Tanaka | Izumi Tanaka and Seiji Nagami | Gauge Group and Topology Change | 8 pages | Int. J. Geom. Methods Mod. Phys. 08, 1225 (2011) | 10.1142/S0219887811005622 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this study is to examine the effect of topology change in the
initial universe. In this study, the concept of $G$-cobordism is introduced to
argue about the topology change of the manifold on which a transformation group
acts. This $G$-manifold has a fiber bundle structure if the group action is
free a... | [
{
"created": "Wed, 30 Dec 2009 06:14:02 GMT",
"version": "v1"
},
{
"created": "Sat, 29 May 2010 14:23:03 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Mar 2011 08:45:01 GMT",
"version": "v3"
}
] | 2013-12-04 | [
[
"Tanaka",
"Izumi",
""
],
[
"Nagami",
"Seiji",
""
]
] | The purpose of this study is to examine the effect of topology change in the initial universe. In this study, the concept of $G$-cobordism is introduced to argue about the topology change of the manifold on which a transformation group acts. This $G$-manifold has a fiber bundle structure if the group action is free and... |
1608.01033 | Hiroyuki Nakano | Hiroyuki Nakano, Brennan Ireland, Manuela Campanelli, Eric J. West | Spinning, Precessing, Black Hole Binary Spacetime via Asymptotic
Matching | 9 pages | null | 10.1088/0264-9381/33/24/247001 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly discuss a method to construct a global, analytic, approximate
spacetime for precessing, spinning binary black holes. The spacetime
construction is broken into three parts: the inner zones are the spacetimes
close to each black hole, and are approximated by perturbed Kerr solutions; the
near zone is far fro... | [
{
"created": "Tue, 2 Aug 2016 23:54:02 GMT",
"version": "v1"
}
] | 2016-12-14 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Ireland",
"Brennan",
""
],
[
"Campanelli",
"Manuela",
""
],
[
"West",
"Eric J.",
""
]
] | We briefly discuss a method to construct a global, analytic, approximate spacetime for precessing, spinning binary black holes. The spacetime construction is broken into three parts: the inner zones are the spacetimes close to each black hole, and are approximated by perturbed Kerr solutions; the near zone is far from ... |
gr-qc/0310022 | Zoltan Perjes | Z. Perj\'es and M. Vas\'uth | Principal null directions of perturbed black holes | To appear in Class. Quantum Grav | Class.Quant.Grav. 20 (2003) 5241-5252 | 10.1088/0264-9381/20/24/001 | null | gr-qc | null | The properties of principal null directions of a perturbed black hole are
investigated. It shown that principal null directions are directly observable
quantities characterizing the space-time. A definition of a perturbed
space-time, generalizing that given by Stewart and Walker is proposed. This
more general framewo... | [
{
"created": "Fri, 3 Oct 2003 12:51:38 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Perjés",
"Z.",
""
],
[
"Vasúth",
"M.",
""
]
] | The properties of principal null directions of a perturbed black hole are investigated. It shown that principal null directions are directly observable quantities characterizing the space-time. A definition of a perturbed space-time, generalizing that given by Stewart and Walker is proposed. This more general framework... |
1411.6815 | Tito Dal Canton | Tito Dal Canton, Andrew P. Lundgren, Alex B. Nielsen | Impact of precession on aligned-spin searches for
neutron-star--black-hole binaries | 11 pages, 7 figures; version accepted by PRD | Phys. Rev. D 91, 062010 (2015) | 10.1103/PhysRevD.91.062010 | LIGO-P1400209 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusion of aligned-spin effects in gravitational-wave search pipelines
for neutron-star--black-hole binary coalescence has been shown to increase the
astrophysical reach with respect to search methods where spins are neglected
completely, under astrophysically reasonable assumptions about black-hole
spins. Howe... | [
{
"created": "Tue, 25 Nov 2014 11:08:23 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2015 11:59:53 GMT",
"version": "v2"
}
] | 2015-04-03 | [
[
"Canton",
"Tito Dal",
""
],
[
"Lundgren",
"Andrew P.",
""
],
[
"Nielsen",
"Alex B.",
""
]
] | The inclusion of aligned-spin effects in gravitational-wave search pipelines for neutron-star--black-hole binary coalescence has been shown to increase the astrophysical reach with respect to search methods where spins are neglected completely, under astrophysically reasonable assumptions about black-hole spins. Howeve... |
1709.02200 | Ulf Leonhardt | Ulf Leonhardt, Itay Griniasty, Sander Wildeman, Emmanuel Fort, Mathias
Fink | Classical analogue of the Unruh effect | null | Phys. Rev. A 98, 022118 (2018) | 10.1103/PhysRevA.98.022118 | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Unruh effect an observer with constant acceleration perceives the
quantum vacuum as thermal radiation. The Unruh effect has been believed to be a
pure quantum phenomenon, but here we show theoretically how the effect arises
from the classical correlation of noise. We demonstrate this idea with a simple
experim... | [
{
"created": "Thu, 7 Sep 2017 12:18:33 GMT",
"version": "v1"
}
] | 2018-08-22 | [
[
"Leonhardt",
"Ulf",
""
],
[
"Griniasty",
"Itay",
""
],
[
"Wildeman",
"Sander",
""
],
[
"Fort",
"Emmanuel",
""
],
[
"Fink",
"Mathias",
""
]
] | In the Unruh effect an observer with constant acceleration perceives the quantum vacuum as thermal radiation. The Unruh effect has been believed to be a pure quantum phenomenon, but here we show theoretically how the effect arises from the classical correlation of noise. We demonstrate this idea with a simple experimen... |
0910.4352 | Nora Breton | L. A. L\'opez (1), A. Feinstein (2) and N. Bret\'on (1) (1. Dpto. de
Fisica, Centro de Investigacion y de Estudios Avanzados del I. P. N.,
M\'exico. 2. Dpto. de Fisica Teorica, Universidad del Pais Vasco, Bilbao,
Spain.) | Generating Black Strings in Higher Dimensions | 11 pages, 2 figures, accepted for publication in J. Mod. Phys. Lett.
A | Mod.Phys.Lett.A25:815-823,2010 | 10.1142/S021773231003224X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting with a Zipoy-Voorhees line element we construct and study the three
parameter family of solutions describing a deformed black string with arbitrary
tension.
| [
{
"created": "Thu, 22 Oct 2009 15:44:19 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"López",
"L. A.",
""
],
[
"Feinstein",
"A.",
""
],
[
"Bretón",
"N.",
""
]
] | Starting with a Zipoy-Voorhees line element we construct and study the three parameter family of solutions describing a deformed black string with arbitrary tension. |
gr-qc/0404029 | Fausto Acernese | F. Acernese, F. Barone, R. De Rosa, A. Eleuteri, L. Giordano and L.
Milano | IIR Adaptive Filters for Detection of Gravitational Waves from
Coalescing Binaries | Accepted at SPIE: "Astronomical Telescopes and Instrumentation". 9
pages, 3 figures | null | 10.1117/12.553016 | null | gr-qc | null | In this paper we propose a new strategy for gravitational waves detection
from coalescing binaries, using IIR Adaptive Line Enhancer (ALE) filters. This
strategy is a classical hierarchical strategy in which the ALE filters have the
role of triggers, used to select data chunks which may contain gravitational
events, ... | [
{
"created": "Wed, 7 Apr 2004 08:52:40 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2004 10:51:41 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Jun 2004 08:29:25 GMT",
"version": "v3"
}
] | 2012-06-14 | [
[
"Acernese",
"F.",
""
],
[
"Barone",
"F.",
""
],
[
"De Rosa",
"R.",
""
],
[
"Eleuteri",
"A.",
""
],
[
"Giordano",
"L.",
""
],
[
"Milano",
"L.",
""
]
] | In this paper we propose a new strategy for gravitational waves detection from coalescing binaries, using IIR Adaptive Line Enhancer (ALE) filters. This strategy is a classical hierarchical strategy in which the ALE filters have the role of triggers, used to select data chunks which may contain gravitational events, to... |
gr-qc/9404028 | Lombardo Fernando | M. Castagnino and F. Lombardo (Univ. of Buenos Aires) | Decoherence, Correlation, and Unstable Quantum States in Semiclassical
Cosmology | 19 pgs. Latex file | Gen.Rel.Grav.28:263-286,1996 | 10.1007/BF02106967 | null | gr-qc | null | It is demonstrated that almost any S-matrix of quantum field theory in curved
spaces posses an infinite set of complex poles (or branch cuts). These poles
can be transformed into complex eigenvalues, the corresponding eigenvectors
being Gamow vectors. All this formalism, which is heuristic in ordinary Hilbert
space, ... | [
{
"created": "Thu, 14 Apr 1994 12:41:29 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Castagnino",
"M.",
"",
"Univ. of Buenos Aires"
],
[
"Lombardo",
"F.",
"",
"Univ. of Buenos Aires"
]
] | It is demonstrated that almost any S-matrix of quantum field theory in curved spaces posses an infinite set of complex poles (or branch cuts). These poles can be transformed into complex eigenvalues, the corresponding eigenvectors being Gamow vectors. All this formalism, which is heuristic in ordinary Hilbert space, be... |
gr-qc/0210100 | Michael Heller | M. Heller, Z. Odrzygozdz, L. Pysiak, W. Sasin | Structure of Malicious Singularities | 18 pages, LaTex | Int.J.Theor.Phys.42:427-441,2003 | 10.1023/A:1024429613783 | CGC-10-02 | gr-qc | null | We investigate spacetimes with their singular boundaries as noncommutative
spaces. Such a space is defined by a noncommutative algebra on a transformation
groupoid $\Gamma = E \times G$, where $E$ is the total space of the frame
bundle over spacetime with its singular boundary, and $G$ its structural group.
There is ... | [
{
"created": "Tue, 29 Oct 2002 16:18:42 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Heller",
"M.",
""
],
[
"Odrzygozdz",
"Z.",
""
],
[
"Pysiak",
"L.",
""
],
[
"Sasin",
"W.",
""
]
] | We investigate spacetimes with their singular boundaries as noncommutative spaces. Such a space is defined by a noncommutative algebra on a transformation groupoid $\Gamma = E \times G$, where $E$ is the total space of the frame bundle over spacetime with its singular boundary, and $G$ its structural group. There is a ... |
2007.12222 | Tiberiu Harko | Maria Cr\u{a}ciun, Tiberiu Harko | Testing Bose-Einstein Condensate dark matter models with the SPARC
galactic rotation curves data | 28 pages, 22 figures, accepted for publication in EPJC; references
added | The European Physical Journal C, Volume 80, Issue 8, article
id.735 (2020) | 10.1140/epjc/s10052-020-8272-4 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nature of one of the fundamental components of the Universe, the dark
matter, is still unknown. One interesting possibility is that dark matter could
exist in the form of a self-interacting Bose-Einstein Condensate (BEC). The
fundamental properties of the dark matter in this model are determined by two
parameters... | [
{
"created": "Thu, 23 Jul 2020 19:30:31 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2020 13:49:57 GMT",
"version": "v2"
}
] | 2020-09-03 | [
[
"Crăciun",
"Maria",
""
],
[
"Harko",
"Tiberiu",
""
]
] | The nature of one of the fundamental components of the Universe, the dark matter, is still unknown. One interesting possibility is that dark matter could exist in the form of a self-interacting Bose-Einstein Condensate (BEC). The fundamental properties of the dark matter in this model are determined by two parameters o... |
gr-qc/0603057 | Jorge P\'aramos | Orfeu Bertolami and Jorge Paramos | The flight of the bumblebee: solutions from a vector-induced spontaneous
Lorentz symmetry breaking model | Talk presented by one of us (O.B.). To be published in the
Proceedings of the Albert Einstein Century International Conference; minor
typos corrected | null | 10.1063/1.2399587 | null | gr-qc | null | The vacuum solutions arising from a spontaneous breaking of Lorentz symmetry
due to the acquisition of a vacuum expectation value by a vector field are
derived. These include the purely radial Lorentz symmetry breaking (LSB),
radial/temporal LSB and axial/temporal LSB scenarios. It is found that the
purely radial LSB... | [
{
"created": "Tue, 14 Mar 2006 23:42:47 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jun 2006 01:15:47 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Jul 2006 22:52:12 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Paramos",
"Jorge",
""
]
] | The vacuum solutions arising from a spontaneous breaking of Lorentz symmetry due to the acquisition of a vacuum expectation value by a vector field are derived. These include the purely radial Lorentz symmetry breaking (LSB), radial/temporal LSB and axial/temporal LSB scenarios. It is found that the purely radial LSB c... |
1805.06804 | R. H. Sanders | R.H. Sanders | Does GW170817 falsify MOND? | 5 pages, honorable mention in Gravity Research Foundation essay
contest 2018 | Int.J.Mod.Phys.D, 27, 14, (2018) 1847027 | 10.1142/S0218271818470272 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational-wave event GW170817 and the near-simultaneous corresponding
gamma-ray burst (GRB 170817 A) falsify modified gravity theories in which the
gravitational geometry differs non-conformally from physical geometry. Thus,
the observations of this event definitively rule out theories, such as TeVeS, a
sugge... | [
{
"created": "Thu, 17 May 2018 14:45:20 GMT",
"version": "v1"
}
] | 2018-12-19 | [
[
"Sanders",
"R. H.",
""
]
] | The gravitational-wave event GW170817 and the near-simultaneous corresponding gamma-ray burst (GRB 170817 A) falsify modified gravity theories in which the gravitational geometry differs non-conformally from physical geometry. Thus, the observations of this event definitively rule out theories, such as TeVeS, a suggest... |
1901.04070 | Luca Guido Molinari | Carlo Alberto Mantica, Luca Guido Molinari, Young Jin Suh and Sameh
Shenawy | Perfect-fluid, generalised Robertson-Walker space-times, and Gray's
decomposition | 10 pages, final version | Journal of Mathematical Physics 60, 052506 (2019) | 10.1063/1.5089040 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give new necessary and sufficient conditions on the Weyl tensor for
generalized Robertson-Walker (GRW) space-times to be perfect-fluid space-times.
For GRW space-times, we determine the form of the Ricci tensor in all the
O(n)-invariant subspaces provided by Gray's decomposition of the gradient of
the Ricci tensor... | [
{
"created": "Sun, 13 Jan 2019 21:51:48 GMT",
"version": "v1"
},
{
"created": "Wed, 29 May 2019 20:24:52 GMT",
"version": "v2"
}
] | 2019-05-31 | [
[
"Mantica",
"Carlo Alberto",
""
],
[
"Molinari",
"Luca Guido",
""
],
[
"Suh",
"Young Jin",
""
],
[
"Shenawy",
"Sameh",
""
]
] | We give new necessary and sufficient conditions on the Weyl tensor for generalized Robertson-Walker (GRW) space-times to be perfect-fluid space-times. For GRW space-times, we determine the form of the Ricci tensor in all the O(n)-invariant subspaces provided by Gray's decomposition of the gradient of the Ricci tensor. ... |
2309.14473 | Tousif Islam | Tousif Islam, Avi Vajpeyi, Feroz H. Shaik, Carl-Johan Haster, Vijay
Varma, Scott E. Field, Jacob Lange, Richard O'Shaughnessy and Rory Smith | Analysis of GWTC-3 with fully precessing numerical relativity surrogate
models | Posteriors and animations are made publicly available at
https://nrsur-catalog.github.io/NRSurCat-1 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The third Gravitational-Wave Transient Catalog (GWTC-3) contains 90 binary
coalescence candidates detected by the LIGO-Virgo-KAGRA Collaboration (LVK). We
provide a re-analysis of binary black hole (BBH) events using a recently
developed numerical relativity (NR) waveform surrogate model, NRSur7dq4, that
includes all... | [
{
"created": "Mon, 25 Sep 2023 19:14:47 GMT",
"version": "v1"
}
] | 2023-09-27 | [
[
"Islam",
"Tousif",
""
],
[
"Vajpeyi",
"Avi",
""
],
[
"Shaik",
"Feroz H.",
""
],
[
"Haster",
"Carl-Johan",
""
],
[
"Varma",
"Vijay",
""
],
[
"Field",
"Scott E.",
""
],
[
"Lange",
"Jacob",
""
],
[
"O'... | The third Gravitational-Wave Transient Catalog (GWTC-3) contains 90 binary coalescence candidates detected by the LIGO-Virgo-KAGRA Collaboration (LVK). We provide a re-analysis of binary black hole (BBH) events using a recently developed numerical relativity (NR) waveform surrogate model, NRSur7dq4, that includes all $... |
2408.04704 | Hassan Hassanabadi prof. | MY Zhang, F Hosseinifar, H Chen, T Sathiyaraj, H Hassanabadi | A New Approach for Calculation of Quasi-Normal Modes and Topological
Charges of Regular Black Holes | null | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | This study examines the properties of a special regular black hole. This
analysis investigates the Hawking temperature, remnant radius and mass, as well
as the effect of parameter $\xi$ on thermodynamic quantities like entropy, heat
capacity, and free energy. The emission rate, evaporation process, quasi-normal
modes... | [
{
"created": "Thu, 8 Aug 2024 18:05:10 GMT",
"version": "v1"
}
] | 2024-08-12 | [
[
"Zhang",
"MY",
""
],
[
"Hosseinifar",
"F",
""
],
[
"Chen",
"H",
""
],
[
"Sathiyaraj",
"T",
""
],
[
"Hassanabadi",
"H",
""
]
] | This study examines the properties of a special regular black hole. This analysis investigates the Hawking temperature, remnant radius and mass, as well as the effect of parameter $\xi$ on thermodynamic quantities like entropy, heat capacity, and free energy. The emission rate, evaporation process, quasi-normal modes b... |
gr-qc/0304017 | Andrew DeBenedictis | A. Das, A. DeBenedictis | Inhomogeneous cosmologies with tachyonic dust as dark matter | 23 pages, four figures. Updated version incorporates some changes in
the introduction. Clarification on why the term tachyonic is used. References
added. Accepted for publication in General Relativity and Gravitation | Gen.Rel.Grav.36:1741-1763,2004 | 10.1023/B:GERG.0000035949.09056.c8 | null | gr-qc astro-ph hep-th | null | A cosmology is considered driven by a stress-energy tensor consisting of a
perfect fluid, an inhomogeneous pressure term (which we call a ``tachyonic
dust'' for reasons which will become apparent) and a cosmological constant. The
inflationary, radiation dominated and matter dominated eras are investigated in
detail. ... | [
{
"created": "Wed, 2 Apr 2003 23:27:08 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2004 19:20:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Das",
"A.",
""
],
[
"DeBenedictis",
"A.",
""
]
] | A cosmology is considered driven by a stress-energy tensor consisting of a perfect fluid, an inhomogeneous pressure term (which we call a ``tachyonic dust'' for reasons which will become apparent) and a cosmological constant. The inflationary, radiation dominated and matter dominated eras are investigated in detail. In... |
2406.13416 | Bibhas Majhi Ranjan | Debasish Ghosh, Bibhas Ranjan Majhi | Influence of thermal bath on Pancharatnam-Berry phase in an accelerated
frame | Latex, 7 pages, 2 figures | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A uniformly accelerated atom captures Pancharatnam-Berry phase in its quantum
state and the phase factor depends on the vacuum fluctuation of the background
quantum fields. We observe that the thermal nature of the fields further
affects the induced phase. Interestingly the induced phase captures the
exchange symmetr... | [
{
"created": "Wed, 19 Jun 2024 10:14:31 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Ghosh",
"Debasish",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | A uniformly accelerated atom captures Pancharatnam-Berry phase in its quantum state and the phase factor depends on the vacuum fluctuation of the background quantum fields. We observe that the thermal nature of the fields further affects the induced phase. Interestingly the induced phase captures the exchange symmetry ... |
gr-qc/0011070 | George Emanuel Avraam Matsas | L.C.B. Crispino, A. Higuchi and G.E.A. Matsas | Quantization of the electromagnetic field outside static black holes and
its application to low-energy phenomena | 26 pages (revtex), no figures, misprints in some conditions corrected | Phys.Rev.D63:124008,2001; Erratum-ibid.D80:029906,2009 | 10.1103/PhysRevD.63.124008 10.1103/PhysRevD.80.029906 | null | gr-qc hep-th | null | We discuss the Gupta-Bleuler quantization of the free electromagnetic field
outside static black holes in the Boulware vacuum. We use a gauge which reduces
to the Feynman gauge in Minkowski spacetime. We also discuss its relation with
gauges used previously. Then we apply the low-energy sector of this field
theory to... | [
{
"created": "Tue, 21 Nov 2000 11:24:48 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jan 2001 12:49:33 GMT",
"version": "v2"
},
{
"created": "Sat, 7 Apr 2001 14:32:31 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Crispino",
"L. C. B.",
""
],
[
"Higuchi",
"A.",
""
],
[
"Matsas",
"G. E. A.",
""
]
] | We discuss the Gupta-Bleuler quantization of the free electromagnetic field outside static black holes in the Boulware vacuum. We use a gauge which reduces to the Feynman gauge in Minkowski spacetime. We also discuss its relation with gauges used previously. Then we apply the low-energy sector of this field theory to i... |
1609.04247 | Alexander Rudenko S. | A.D. Dolgov, S.I. Godunov, A.S. Rudenko | Evolution of thick domain walls in de Sitter universe | 9 pages, 10 figures; final version published in JCAP | JCAP 10 (2016) 026 | 10.1088/1475-7516/2016/10/026 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider thick domain walls in a de Sitter universe following paper by
Basu and Vilenkin. However, we are interested not only in stationary solutions
found therein, but also investigate the general case of domain wall evolution
with time. When the wall thickness parameter, $\delta_0$, is smaller than
$H^{-1}/\sqrt... | [
{
"created": "Tue, 13 Sep 2016 03:00:22 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2016 11:14:56 GMT",
"version": "v2"
}
] | 2016-10-20 | [
[
"Dolgov",
"A. D.",
""
],
[
"Godunov",
"S. I.",
""
],
[
"Rudenko",
"A. S.",
""
]
] | We consider thick domain walls in a de Sitter universe following paper by Basu and Vilenkin. However, we are interested not only in stationary solutions found therein, but also investigate the general case of domain wall evolution with time. When the wall thickness parameter, $\delta_0$, is smaller than $H^{-1}/\sqrt{2... |
gr-qc/9902071 | Sanjay Moreshwar Wagh | Sanjay M. Wagh and Pradeep S. Muktibodh | A Radiating and Rotating Metric | Latex file 11 pages | null | null | null | gr-qc | null | A non-static solution of Einstein's field equations of General Relativity
representing the gravitational field of an axisymmetric radiation flow is
obtained using the Eddington or the Kerr-Schild form for the metric. A solution
obtained here manifestly corresponds to the Kerr metric with its
mass-parameter, $m$, bein... | [
{
"created": "Tue, 23 Feb 1999 13:58:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wagh",
"Sanjay M.",
""
],
[
"Muktibodh",
"Pradeep S.",
""
]
] | A non-static solution of Einstein's field equations of General Relativity representing the gravitational field of an axisymmetric radiation flow is obtained using the Eddington or the Kerr-Schild form for the metric. A solution obtained here manifestly corresponds to the Kerr metric with its mass-parameter, $m$, being ... |
gr-qc/9909034 | Lovas Istvan | I. Lovas (Kossuth Lajos University, Debrecen, Hungary) | Quantization of Gravitational Waves and Squeezing | null | Heavy Ion Phys. 13 (2001) 297-304 | null | KFKI-1999-05-B | gr-qc | null | The question whether gravitational waves are quantised or not can in
principle be answered by the help of correlation measurements. If the
gravitational waves are quantised and they are generated by the change of the
background metrics then they can be in squeezed state.
In a sqeezed state there is a correlation be... | [
{
"created": "Fri, 10 Sep 1999 07:41:12 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Lovas",
"I.",
"",
"Kossuth Lajos University, Debrecen, Hungary"
]
] | The question whether gravitational waves are quantised or not can in principle be answered by the help of correlation measurements. If the gravitational waves are quantised and they are generated by the change of the background metrics then they can be in squeezed state. In a sqeezed state there is a correlation betwee... |
2003.05674 | Avadhut Purohit | Avadhut V Purohit | Geometrization of the scalar matter | 8 pages, no figures. arXiv admin note: substantial text overlap with
arXiv:1910.13217 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scalar matter and gravity are unified into the geometric scalar matter
and quantized. The quantum with a definite 3-metric has definite energy but
does not have well-defined momentum. The quantum theory resolves singularities.
| [
{
"created": "Thu, 12 Mar 2020 09:32:03 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jul 2020 10:47:02 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Oct 2020 06:17:55 GMT",
"version": "v3"
},
{
"created": "Fri, 5 Feb 2021 13:45:26 GMT",
"version": "v4"
},
{
"cr... | 2021-07-15 | [
[
"Purohit",
"Avadhut V",
""
]
] | The scalar matter and gravity are unified into the geometric scalar matter and quantized. The quantum with a definite 3-metric has definite energy but does not have well-defined momentum. The quantum theory resolves singularities. |
1411.4711 | Eric Poisson | Eric Poisson | Tidal deformation of a slowly rotating black hole | 32 pages, 2 figures, revised after referee comments, matches the
published version | Phys. Rev. D 91, 044004 (2015) | 10.1103/PhysRevD.91.044004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the first part of this article I determine the geometry of a slowly
rotating black hole deformed by generic tidal forces created by a remote
distribution of matter. The metric of the deformed black hole is obtained by
integrating the Einstein field equations in a vacuum region of spacetime
bounded by r < r_max, wi... | [
{
"created": "Tue, 18 Nov 2014 01:41:12 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jan 2015 01:15:32 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Poisson",
"Eric",
""
]
] | In the first part of this article I determine the geometry of a slowly rotating black hole deformed by generic tidal forces created by a remote distribution of matter. The metric of the deformed black hole is obtained by integrating the Einstein field equations in a vacuum region of spacetime bounded by r < r_max, with... |
0710.0702 | James Battat | James B. R. Battat, John F. Chandler, Christopher W. Stubbs | Testing for Lorentz Violation: Constraints on Standard-Model Extension
Parameters via Lunar Laser Ranging | 10 pages, 3 figures, Submitted to Phys. Rev. Letters | Phys.Rev.Lett.99:241103,2007 | 10.1103/PhysRevLett.99.241103 | null | gr-qc astro-ph | null | We present constraints on violations of Lorentz Invariance based on Lunar
Laser Ranging (LLR) data. LLR measures the Earth-Moon separation by timing the
round-trip travel of light between the two bodies, and is currently accurate to
a few centimeters (parts in $10^{11}$ of the total distance). By analyzing
archival L... | [
{
"created": "Wed, 3 Oct 2007 03:03:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Battat",
"James B. R.",
""
],
[
"Chandler",
"John F.",
""
],
[
"Stubbs",
"Christopher W.",
""
]
] | We present constraints on violations of Lorentz Invariance based on Lunar Laser Ranging (LLR) data. LLR measures the Earth-Moon separation by timing the round-trip travel of light between the two bodies, and is currently accurate to a few centimeters (parts in $10^{11}$ of the total distance). By analyzing archival LLR... |
gr-qc/0506071 | Vladimir Khatsymovsky | V.M. Khatsymovsky | Discrete quantum gravity in the framework of Regge calculus formalism | LaTeX, 16 pages, to appear in JETP | null | 10.1134/1.2103210 | null | gr-qc | null | An approach to the discrete quantum gravity based on the Regge calculus is
discussed which was developed in a number of our papers. Regge calculus is
general relativity for the subclass of general Riemannian manifolds called
piecewise flat ones. Regge calculus deals with the discrete set of variables,
triangulation l... | [
{
"created": "Sun, 12 Jun 2005 09:22:23 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Dec 2005 10:59:49 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | An approach to the discrete quantum gravity based on the Regge calculus is discussed which was developed in a number of our papers. Regge calculus is general relativity for the subclass of general Riemannian manifolds called piecewise flat ones. Regge calculus deals with the discrete set of variables, triangulation len... |
0708.1080 | Lorenzo Iorio | Lorenzo Iorio | Constraints on the range lambda of Yukawa-like modifications to the
Newtonian inverse-square law of gravitation from Solar System planetary
motions | LaTex2e, 1 table, 1 figure, 12 pages. Small change after eq.(10),
pag.6. Final version to appear in JHEP (Journal of High Energy Physics) | JHEP0710:041,2007 | 10.1088/1126-6708/2007/10/041 | null | gr-qc astro-ph hep-ph physics.space-ph | null | In this paper we use the latest corrections to the Newton-Einstein secular
perihelion rates of some planets of the Solar System, phenomenologically
estimated with the EPM2004 ephemerides by the Russian astronomer E.V. Pitjeva,
to put severe constraints on the range parameter lambda characterizing the
Yukawa-like modi... | [
{
"created": "Wed, 8 Aug 2007 16:30:09 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2007 17:34:44 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Aug 2007 14:14:39 GMT",
"version": "v3"
},
{
"created": "Thu, 20 Sep 2007 11:23:46 GMT",
"version": "v4"
},
{
"cre... | 2008-11-26 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we use the latest corrections to the Newton-Einstein secular perihelion rates of some planets of the Solar System, phenomenologically estimated with the EPM2004 ephemerides by the Russian astronomer E.V. Pitjeva, to put severe constraints on the range parameter lambda characterizing the Yukawa-like modifi... |
gr-qc/9612049 | Mohammad Nouri-Zonoz | Donald Lynden-Bell and Mohammad Nouri-Zonoz | Classical Monopoles: Newton, NUT-space, gravomagnetic lensing and atomic
spectra | 39 pages, 9 figures and 2 tables available on request from the
authors | Rev.Mod.Phys.70:427-446,1998 | 10.1103/RevModPhys.70.427 | null | gr-qc | null | Stimulated by a scholium in Newton's Principia we find some beautiful results
in classical mechanics which can be interpreted in terms of the orbits in the
field of a mass endowed with a gravomagnetic monopole. All the orbits lie on
cones! When the cones are slit open and flattened the orbits are exactly the
ellipses... | [
{
"created": "Wed, 18 Dec 1996 11:29:27 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Lynden-Bell",
"Donald",
""
],
[
"Nouri-Zonoz",
"Mohammad",
""
]
] | Stimulated by a scholium in Newton's Principia we find some beautiful results in classical mechanics which can be interpreted in terms of the orbits in the field of a mass endowed with a gravomagnetic monopole. All the orbits lie on cones! When the cones are slit open and flattened the orbits are exactly the ellipses a... |
gr-qc/9301010 | null | M.Gasperini and M.Giovannini | Entropy Production in the Cosmological Amplification of the Vacuum
Fluctuations | 10 pages, plain tex, to appear in Phys.Lett.B, DFTT-63/92 | Phys.Lett. B301 (1993) 334-338 | 10.1016/0370-2693(93)91159-K | null | gr-qc hep-th | null | We estimate the entropy associated to a background of squeezed cosmic
gravitons, and we argue that the process of cosmological pair production from
the vacuum may explain the large amount of entropy of our present universe.
| [
{
"created": "Tue, 12 Jan 1993 18:16:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Gasperini",
"M.",
""
],
[
"Giovannini",
"M.",
""
]
] | We estimate the entropy associated to a background of squeezed cosmic gravitons, and we argue that the process of cosmological pair production from the vacuum may explain the large amount of entropy of our present universe. |
gr-qc/0601092 | Kourosh Nozari | Kourosh Nozari and Behnaz Fazlpour | Generalized Uncertainty Principle, Modified Dispersion Relations and
Early Universe Thermodynamics | 21 Pages, 3 eps Figure, Revised Version | Gen.Rel.Grav.38:1661-1679,2006 | 10.1007/s10714-006-0331-0 | null | gr-qc | null | In this paper, we study the effects of Generalized Uncertainty Principle(GUP)
and Modified Dispersion Relations(MDRs) on the thermodynamics of
ultra-relativistic particles in early universe. We show that limitations
imposed by GUP and particle horizon on the measurement processes, lead to
certain modifications of ear... | [
{
"created": "Mon, 23 Jan 2006 13:11:47 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jun 2006 10:17:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nozari",
"Kourosh",
""
],
[
"Fazlpour",
"Behnaz",
""
]
] | In this paper, we study the effects of Generalized Uncertainty Principle(GUP) and Modified Dispersion Relations(MDRs) on the thermodynamics of ultra-relativistic particles in early universe. We show that limitations imposed by GUP and particle horizon on the measurement processes, lead to certain modifications of early... |
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