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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2309.01595 | Leihua Liu | Tao Li, Lei-Hua Liu | Cosmological complexity of the modified dispersion relation | matching the published version | Phys.Lett.B 854 (2024) 138728 | 10.1016/j.physletb.2024.138728 | null | gr-qc astro-ph.CO hep-ph hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | Complexity will be more and more essential in high-energy physics. It is
naturally extended into the very early universe. Considering the universe as a
quantum chaotic system, the curvature perturbation of the scalar field is
identified with the two-mode squeezed state. By solving the
Schr$\ddot{o}$dinger equation, o... | [
{
"created": "Mon, 4 Sep 2023 13:26:20 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 13:44:52 GMT",
"version": "v2"
},
{
"created": "Thu, 23 May 2024 07:51:09 GMT",
"version": "v3"
}
] | 2024-05-24 | [
[
"Li",
"Tao",
""
],
[
"Liu",
"Lei-Hua",
""
]
] | Complexity will be more and more essential in high-energy physics. It is naturally extended into the very early universe. Considering the universe as a quantum chaotic system, the curvature perturbation of the scalar field is identified with the two-mode squeezed state. By solving the Schr$\ddot{o}$dinger equation, one... |
1210.4541 | Andrew J. S. Hamilton | Andrew J. S. Hamilton | Illusory horizons, thermodynamics, and holography inside black holes | 13 pages, 7 figures. To appear in the Proceedings of the conference
"Relativity and Gravitation, 100 Years after Einstein in Prague", Prague,
Czech Republic, June 25-29, 2012 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is persistent and endemic confusion between the true (future) horizon
and the illusory (past) horizon of a black hole. The illusory horizon is the
redshifting surface of matter that fell into the black hole long ago. A person
who free-falls through the horizon of a black hole falls through the true
horizon, not... | [
{
"created": "Tue, 16 Oct 2012 19:55:27 GMT",
"version": "v1"
}
] | 2012-10-17 | [
[
"Hamilton",
"Andrew J. S.",
""
]
] | There is persistent and endemic confusion between the true (future) horizon and the illusory (past) horizon of a black hole. The illusory horizon is the redshifting surface of matter that fell into the black hole long ago. A person who free-falls through the horizon of a black hole falls through the true horizon, not t... |
0908.4102 | David Garfinkle | David Garfinkle | The motion of galaxy clusters in inhomogeneous cosmologies | 7 pages, 2 figures | Class.Quant.Grav.27:065002,2010 | 10.1088/0264-9381/27/6/065002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lemaitre-Tolman-Bondi inhomogeneous spacetimes can be used as a cosmological
model to account for the type Ia supernova data. However, such models also give
rise to large velocities of galaxy clusters with respect to the cosmic
microwave background. Those velocities can be measured using the kinematic
Sunyaev-Zeldovi... | [
{
"created": "Thu, 27 Aug 2009 21:32:11 GMT",
"version": "v1"
}
] | 2010-02-23 | [
[
"Garfinkle",
"David",
""
]
] | Lemaitre-Tolman-Bondi inhomogeneous spacetimes can be used as a cosmological model to account for the type Ia supernova data. However, such models also give rise to large velocities of galaxy clusters with respect to the cosmic microwave background. Those velocities can be measured using the kinematic Sunyaev-Zeldovich... |
2012.00027 | Rossella Gamba | Rossella Gamba, Sebastiano Bernuzzi, Alessandro Nagar | Fast, faithful, frequency-domain effective-one-body waveforms for
compact binary coalescences | null | null | 10.1103/PhysRevD.104.084058 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inference of binary neutron star properties from gravitational-wave
observations requires the generation of millions of waveforms, each one
spanning about three order of magnitudes in frequency range. Thus, waveform
models must be efficiently generated and, at the same time, be faithful from
the post-Newtonian qu... | [
{
"created": "Mon, 30 Nov 2020 19:00:06 GMT",
"version": "v1"
}
] | 2021-10-27 | [
[
"Gamba",
"Rossella",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Nagar",
"Alessandro",
""
]
] | The inference of binary neutron star properties from gravitational-wave observations requires the generation of millions of waveforms, each one spanning about three order of magnitudes in frequency range. Thus, waveform models must be efficiently generated and, at the same time, be faithful from the post-Newtonian quas... |
2105.02161 | JiaMao Lin | Jia-Mao Lin, Ming-Jian Luo, Zi-Han Zheng, Lei Yin, Jia-Hui Huang | Extremal rotating black holes, scalar perturbation and superradiant
stability | 7 pages,4 figures,references added | null | 10.1016/j.physletb.2021.136392 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A (charged) rotating black hole may be unstable against a (charged) massive
scalar field perturbation due to the existence of superradiance modes. The
stability property depends on the parameters of the system. In this paper, the
superradiant stable parameter space is studied for the four-dimensional
extremal Kerr an... | [
{
"created": "Wed, 5 May 2021 16:16:29 GMT",
"version": "v1"
}
] | 2021-06-02 | [
[
"Lin",
"Jia-Mao",
""
],
[
"Luo",
"Ming-Jian",
""
],
[
"Zheng",
"Zi-Han",
""
],
[
"Yin",
"Lei",
""
],
[
"Huang",
"Jia-Hui",
""
]
] | A (charged) rotating black hole may be unstable against a (charged) massive scalar field perturbation due to the existence of superradiance modes. The stability property depends on the parameters of the system. In this paper, the superradiant stable parameter space is studied for the four-dimensional extremal Kerr and ... |
1204.1699 | XiaoXiong Zeng | Xiao-Xiong Zeng, Wen-Biao Liu | Spectroscopy of a Reissner-Nordstr\"{o}m black hole via an action
variable | 6 pages, 0 figures | Eur. Phys. J. C (2012) 72:1987 | 10.1140/epjc/s10052-012-1987-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the help of the Bohr--Sommerfeld quantization rule, the area spectrum of
a charged, spherically symmetric spacetime is obtained by studying an adiabatic
invariant action variable. The period of the Einstein-Maxwell system, which is
related to the surface gravity of a given spacetime, is determined by the
Kruskal... | [
{
"created": "Sun, 8 Apr 2012 02:27:26 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Apr 2012 09:09:44 GMT",
"version": "v2"
}
] | 2012-04-23 | [
[
"Zeng",
"Xiao-Xiong",
""
],
[
"Liu",
"Wen-Biao",
""
]
] | With the help of the Bohr--Sommerfeld quantization rule, the area spectrum of a charged, spherically symmetric spacetime is obtained by studying an adiabatic invariant action variable. The period of the Einstein-Maxwell system, which is related to the surface gravity of a given spacetime, is determined by the Kruskal--... |
1905.00356 | Theo Torres | Theo Torres, Sam Patrick, Maur\'icio Richartz and Silke Weinfurtner | Analogue Black Hole Spectroscopy; or, how to listen to dumb holes | 17 pages, 4 figures | Class. Quantum Grav. 36 194002 (2019) | 10.1088/1361-6382/ab3d48 | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spectroscopy is a fundamental tool in science which consists in studying the
response of a system as a function of frequency. Among its many applications in
Physics, Biology, Chemistry and other fields, the possibility of identifying
objects and structures through their emission spectra is remarkable and
incredibly u... | [
{
"created": "Wed, 1 May 2019 16:11:16 GMT",
"version": "v1"
}
] | 2019-10-07 | [
[
"Torres",
"Theo",
""
],
[
"Patrick",
"Sam",
""
],
[
"Richartz",
"Maurício",
""
],
[
"Weinfurtner",
"Silke",
""
]
] | Spectroscopy is a fundamental tool in science which consists in studying the response of a system as a function of frequency. Among its many applications in Physics, Biology, Chemistry and other fields, the possibility of identifying objects and structures through their emission spectra is remarkable and incredibly use... |
1805.04327 | Jie-Xiong Mo | Jie-Xiong Mo and Gu-Qiang Li | Effects of Lovelock gravity on the Joule-Thomson expansion | 14pages,5figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effects of Lovelock gravity on the Joule-Thomson expansion are probed from
various perspectives. The well-known Joule-Thomson coefficient is derived with
both the explicit expression and intuitive image presented. Moreover, the
inversion curves showing the relation between the inversion temperature and the
inversion ... | [
{
"created": "Fri, 11 May 2018 11:24:46 GMT",
"version": "v1"
}
] | 2018-05-14 | [
[
"Mo",
"Jie-Xiong",
""
],
[
"Li",
"Gu-Qiang",
""
]
] | Effects of Lovelock gravity on the Joule-Thomson expansion are probed from various perspectives. The well-known Joule-Thomson coefficient is derived with both the explicit expression and intuitive image presented. Moreover, the inversion curves showing the relation between the inversion temperature and the inversion pr... |
2011.10179 | Chen Zhang | Bob Holdom, Robert B. Mann, Chen Zhang | Unruh-DeWitt Detector Differentiation of Black Holes and Exotic Compact
Objects | 18 pages, 22 figures | Phys. Rev. D 103, 124046 (2021) | 10.1103/PhysRevD.103.124046 | null | gr-qc astro-ph.HE quant-ph | http://creativecommons.org/licenses/by/4.0/ | We study the response of a static Unruh-DeWitt detector outside an exotic
compact object (ECO) with a general reflective boundary condition in 3+1
dimensions. The horizonless ECO, whose boundary is extremely close to the
would-be event horizon, acts as a black hole mimicker. We find that the
response rate is notably ... | [
{
"created": "Fri, 20 Nov 2020 02:33:04 GMT",
"version": "v1"
}
] | 2021-06-30 | [
[
"Holdom",
"Bob",
""
],
[
"Mann",
"Robert B.",
""
],
[
"Zhang",
"Chen",
""
]
] | We study the response of a static Unruh-DeWitt detector outside an exotic compact object (ECO) with a general reflective boundary condition in 3+1 dimensions. The horizonless ECO, whose boundary is extremely close to the would-be event horizon, acts as a black hole mimicker. We find that the response rate is notably di... |
0901.1079 | Steven Willison | E. Gravanis and S. Willison | Singular sources in gravity and homotopy in the space of connections | 21 pages, 9 figures, RevTeX | J.Math.Phys.50:122505,2009 | 10.1063/1.3250196 | CECS-PHY-09/01 | gr-qc hep-th math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Suppose a Lagrangian is constructed from its fields and their derivatives.
When the field configuration is a distribution, it is unambiguously defined as
the limit of a sequence of smooth fields. The Lagrangian may or may not be a
distribution, depending on whether there is some undefined product of
distributions. Su... | [
{
"created": "Thu, 8 Jan 2009 16:47:10 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Gravanis",
"E.",
""
],
[
"Willison",
"S.",
""
]
] | Suppose a Lagrangian is constructed from its fields and their derivatives. When the field configuration is a distribution, it is unambiguously defined as the limit of a sequence of smooth fields. The Lagrangian may or may not be a distribution, depending on whether there is some undefined product of distributions. Supp... |
0812.1590 | Neil J. Cornish | Joey Shapiro Key and Neil J. Cornish | Characterizing the Gravitational Wave Signature from Cosmic String Cusps | 10 pages, 10 figures | Phys.Rev.D79:043014,2009 | 10.1103/PhysRevD.79.043014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic strings are predicted to form kinks and cusps that travel along the
string at close to the speed of light. These disturbances are radiated away as
highly beamed gravitational waves that produce a burst like pulse as the cone
of emission sweeps past an observer. Gravitational wave detectors such as the
Laser In... | [
{
"created": "Mon, 8 Dec 2008 23:15:20 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Key",
"Joey Shapiro",
""
],
[
"Cornish",
"Neil J.",
""
]
] | Cosmic strings are predicted to form kinks and cusps that travel along the string at close to the speed of light. These disturbances are radiated away as highly beamed gravitational waves that produce a burst like pulse as the cone of emission sweeps past an observer. Gravitational wave detectors such as the Laser Inte... |
1307.0377 | Spiros Cotsakis | Spiros Cotsakis, Georgia Kittou | Flat limits of curved interacting cosmic fluids | v2: 26 pages, new mathematical appendix, improved readability,
version to appear in Phys. Rev. D | Phys. Rev. D 88, 083514 (2013) | 10.1103/PhysRevD.88.083514 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study curved isotropic cosmologies filled with two interacting fluids near
their time singularities. We find that a number of these universes asymptote to
flat limits in the sense that their asymptotic properties become
indistinguishable from those of flat Friedmann-Robertson-Walker models on
approach to the singu... | [
{
"created": "Mon, 1 Jul 2013 14:26:03 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2013 07:50:19 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Cotsakis",
"Spiros",
""
],
[
"Kittou",
"Georgia",
""
]
] | We study curved isotropic cosmologies filled with two interacting fluids near their time singularities. We find that a number of these universes asymptote to flat limits in the sense that their asymptotic properties become indistinguishable from those of flat Friedmann-Robertson-Walker models on approach to the singula... |
2210.17387 | Francisco Lobo | Marzieh Peyravi, Samira Nazifkar, Francisco S. N. Lobo, Kurosh Javidan | Thick branes via higher order field theory models with exponential and
power-law tails | 23 pages, 10 figures. V2: 25 pages; 12 figures; matches published
version. arXiv admin note: text overlap with arXiv:1504.04603 | Eur. Phys. J. C 83, 832 (2023) | 10.1140/epjc/s10052-023-11992-z | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we obtain exact thick brane models in $4+1$ dimensions
generated by higher order field theory kinks, inspired by specific potentials
for $\phi^{10}$ and $\phi^{18}$ models. We verify that the geodesic equation
along the fifth dimension confirms the confining effects of the scalar field on
the brane for ... | [
{
"created": "Mon, 31 Oct 2022 15:13:42 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2023 17:08:09 GMT",
"version": "v2"
}
] | 2023-09-22 | [
[
"Peyravi",
"Marzieh",
""
],
[
"Nazifkar",
"Samira",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Javidan",
"Kurosh",
""
]
] | In this work, we obtain exact thick brane models in $4+1$ dimensions generated by higher order field theory kinks, inspired by specific potentials for $\phi^{10}$ and $\phi^{18}$ models. We verify that the geodesic equation along the fifth dimension confirms the confining effects of the scalar field on the brane for al... |
gr-qc/9708055 | Hitoshi Kitada | Hitoshi Kitada (Univ. of Tokyo & Univ. of Virginia) and Lancelot R.
Fletcher (The Free Lance Academy) | Comments on the Problem of Time | 6 pages, LaTeX, the arguments are strengthened with a mathematical
theorem | null | null | KIMS-1997-08-22 | gr-qc | null | The problem of time, considered as a problem in the usual physical context,
is reflected in relation with the paper by Kauffman and Smolin (gr-qc/9703026).
It is shown that the problem is a misposed problem in the sense that it was
raised with a lack of the recognition of mathematically known facts.
| [
{
"created": "Fri, 22 Aug 1997 17:25:09 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Aug 1997 03:59:53 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Sep 1997 18:34:15 GMT",
"version": "v3"
},
{
"created": "Sat, 1 Nov 1997 09:33:51 GMT",
"version": "v4"
}
] | 2008-02-03 | [
[
"Kitada",
"Hitoshi",
"",
"Univ. of Tokyo & Univ. of Virginia"
],
[
"Fletcher",
"Lancelot R.",
"",
"The Free Lance Academy"
]
] | The problem of time, considered as a problem in the usual physical context, is reflected in relation with the paper by Kauffman and Smolin (gr-qc/9703026). It is shown that the problem is a misposed problem in the sense that it was raised with a lack of the recognition of mathematically known facts. |
gr-qc/9509031 | Piljin Yi | Piljin Yi | Quenched Hawking Radiation and the Black Hole Pair-Creation Rate | LaTeX, 18 pages, 5 .eps figures (to appear in the proceedings of the
Sixth Moscow Quantum Gravity Seminar, June 12-19, 1995) | null | null | CU-TP-702 | gr-qc hep-th | null | The main topic of this talk is the Hawking effect when the black holes in
question are undergoing a uniform acceleration. The semiclassical effect of the
acceleration is most striking when the Hawking temperature equals the
acceleration temperature. Within the usual late-time approximation, the natural
black hole vac... | [
{
"created": "Tue, 19 Sep 1995 11:18:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yi",
"Piljin",
""
]
] | The main topic of this talk is the Hawking effect when the black holes in question are undergoing a uniform acceleration. The semiclassical effect of the acceleration is most striking when the Hawking temperature equals the acceleration temperature. Within the usual late-time approximation, the natural black hole vacuu... |
gr-qc/9902073 | Shahar Hod | Shahar Hod | Mode-coupling in rotating gravitational collapse: Gravitational and
electromagnetic perturbations | 16 pages | Phys. Rev. D 61, 064018 (2000) | 10.1103/PhysRevD.61.064018 | null | gr-qc | null | We consider the late-time evolution of {\it gravitational} and
electromagnetic perturbations in realistic {\it rotating} Kerr spacetimes. We
give a detailed analysis of the mode-coupling phenomena in rotating
gravitational collapse. A consequence of this phenomena is that the late-time
tail is dominated by modes whic... | [
{
"created": "Tue, 23 Feb 1999 14:07:42 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Mar 2000 07:49:30 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Hod",
"Shahar",
""
]
] | We consider the late-time evolution of {\it gravitational} and electromagnetic perturbations in realistic {\it rotating} Kerr spacetimes. We give a detailed analysis of the mode-coupling phenomena in rotating gravitational collapse. A consequence of this phenomena is that the late-time tail is dominated by modes which,... |
0809.3218 | David Garfinkle | Jim Isenberg (University of Oregon), Lyman Page (Princeton
University), Maria Alessandra Papa (Albert Einstein Institute), Edward K.
Porter (Albert Einstein Institute) | Matters of Gravity, The Newsletter of the Topical Group in Gravitation
of the American Physical Society, Volume 32, Fall 2008 | 19 pages, 3 figures, latex; Edited by David Garfinkle and Greg Comer | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GGR News:
- Remembering Wheeler, by Jim Isenberg;
Research Briefs:
- A Brief Summary of the WMAP5 Results, by Lyman Page;
- Science with LIGO, by Maria Alessandra Papa;
Conference Reports:
- 7th LISA Symposium, by Edward K. Porter;
- The Fourth Gulf Coast Gravity Conference, by Lior Burko
| [
{
"created": "Thu, 18 Sep 2008 18:09:23 GMT",
"version": "v1"
}
] | 2008-12-01 | [
[
"Isenberg",
"Jim",
"",
"University of Oregon"
],
[
"Page",
"Lyman",
"",
"Princeton\n University"
],
[
"Papa",
"Maria Alessandra",
"",
"Albert Einstein Institute"
],
[
"Porter",
"Edward K.",
"",
"Albert Einstein Institute"
]
] | GGR News: - Remembering Wheeler, by Jim Isenberg; Research Briefs: - A Brief Summary of the WMAP5 Results, by Lyman Page; - Science with LIGO, by Maria Alessandra Papa; Conference Reports: - 7th LISA Symposium, by Edward K. Porter; - The Fourth Gulf Coast Gravity Conference, by Lior Burko |
1710.10961 | Rong-Jia Yang | Rong-Jia Yang | Gravitational waves in conformal gravity | 8 pages, no figures, some errors are corrected | Phys. Lett. B 784 (2018) 212-216 | 10.1016/j.physletb.2018.08.002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the gravitational radiation in conformal gravity theory. We
perturb the metric from flat Mikowski space and obtain the wave equation after
introducing the appropriate transformation for perturbation. We derive the
effective energy-momentum tensor for the gravitational radiation, which can be
used to deter... | [
{
"created": "Mon, 30 Oct 2017 14:16:47 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2018 12:55:47 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Aug 2018 14:20:48 GMT",
"version": "v3"
}
] | 2018-08-28 | [
[
"Yang",
"Rong-Jia",
""
]
] | We consider the gravitational radiation in conformal gravity theory. We perturb the metric from flat Mikowski space and obtain the wave equation after introducing the appropriate transformation for perturbation. We derive the effective energy-momentum tensor for the gravitational radiation, which can be used to determi... |
1901.05648 | Sebastian Schuster | Sebastian Schuster (Victoria University of Wellington) | Black Hole Evaporation: Sparsity in Analogue and General Relativistic
Space-Times | PhD Thesis (Victoria University of Wellington), xiv+226 pages, 13
figures, 5 tables, parts already published in arXiv:1808.07987,
arXiv:1802.09807, arXiv:1801.05549, arXiv:1706.06280, arXiv:1610.06135,
arXiv:1506.03975 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our understanding of black holes changed drastically, when Stephen Hawking
discovered their evaporation due to quantum mechanical processes. One core
feature of this effect is both its similarity and simultaneous dissimilarity to
classical black body radiation: A black hole's spectrum certainly looks like
that of a b... | [
{
"created": "Thu, 17 Jan 2019 07:06:22 GMT",
"version": "v1"
}
] | 2019-01-18 | [
[
"Schuster",
"Sebastian",
"",
"Victoria University of Wellington"
]
] | Our understanding of black holes changed drastically, when Stephen Hawking discovered their evaporation due to quantum mechanical processes. One core feature of this effect is both its similarity and simultaneous dissimilarity to classical black body radiation: A black hole's spectrum certainly looks like that of a bla... |
2105.11380 | Adri\'an Del R\'io Vega | Ivan Agullo, Vitor Cardoso, Adri\'an del Rio, Michele Maggiore, Jorge
Pullin | Absorption spectroscopy of quantum black holes with gravitational waves | Received honorable mention at the GRF essay competition of 2021 | null | 10.1142/S021827182142013X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of electromagnetic radiation emitted or absorbed by matter
was instrumental in revealing the quantum properties of atoms and molecules in
the early XX century, and constituted a turning-point in the development of the
quantum theory. Quantum mechanics changes dramatically the way radiation and
matter ... | [
{
"created": "Mon, 24 May 2021 16:18:01 GMT",
"version": "v1"
}
] | 2022-01-26 | [
[
"Agullo",
"Ivan",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"del Rio",
"Adrián",
""
],
[
"Maggiore",
"Michele",
""
],
[
"Pullin",
"Jorge",
""
]
] | The observation of electromagnetic radiation emitted or absorbed by matter was instrumental in revealing the quantum properties of atoms and molecules in the early XX century, and constituted a turning-point in the development of the quantum theory. Quantum mechanics changes dramatically the way radiation and matter in... |
2110.06469 | Kiyoshi Shiraishi | Nahomi Kan, Takuma Aoyama, Taiga Hasegawa, Kiyoshi Shiraishi | Third quantization for scalar and spinor wave functions of the Universe
in an extended minisuperspace | 19 pages, 2 figures. revised version 2 | Class. Quant. Grav. 39 (2022) 165010 | 10.1088/1361-6382/ac8095 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the third quantization in quantum cosmology of a minisuperspace
extended by the Eisenhart-Duval lift. We study the third quantization based on
both Klein-Gordon type and Dirac-type equations in the extended minisuperspace.
Spontaneous creation of "universes" is investigated upon the quantization of a
simp... | [
{
"created": "Wed, 13 Oct 2021 03:12:15 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2021 00:27:17 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Feb 2022 00:34:48 GMT",
"version": "v3"
},
{
"created": "Fri, 13 May 2022 00:24:49 GMT",
"version": "v4"
},
{
"c... | 2022-08-23 | [
[
"Kan",
"Nahomi",
""
],
[
"Aoyama",
"Takuma",
""
],
[
"Hasegawa",
"Taiga",
""
],
[
"Shiraishi",
"Kiyoshi",
""
]
] | We consider the third quantization in quantum cosmology of a minisuperspace extended by the Eisenhart-Duval lift. We study the third quantization based on both Klein-Gordon type and Dirac-type equations in the extended minisuperspace. Spontaneous creation of "universes" is investigated upon the quantization of a simple... |
1409.1782 | Roland Steinbauer | Jiri Podolsky, Clemens S\"amann, Roland Steinbauer, Robert Svarc | The global existence, uniqueness and C^1-regularity of geodesics in
nonexpanding impulsive gravitational waves | 20 pages, 1 figure, minor revisions, final version | Class.Quant.Grav.32:025003,2015 | 10.1088/0264-9381/32/2/025003 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study geodesics in the complete family of nonexpanding impulsive
gravitational waves propagating in spaces of constant curvature, that is
Minkowski, de Sitter and anti-de Sitter universes. Employing the continuous
form of the metric we prove existence and uniqueness of continuously
differentiable geodesics (in the... | [
{
"created": "Fri, 5 Sep 2014 13:12:02 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jan 2015 10:55:25 GMT",
"version": "v2"
}
] | 2015-01-30 | [
[
"Podolsky",
"Jiri",
""
],
[
"Sämann",
"Clemens",
""
],
[
"Steinbauer",
"Roland",
""
],
[
"Svarc",
"Robert",
""
]
] | We study geodesics in the complete family of nonexpanding impulsive gravitational waves propagating in spaces of constant curvature, that is Minkowski, de Sitter and anti-de Sitter universes. Employing the continuous form of the metric we prove existence and uniqueness of continuously differentiable geodesics (in the s... |
2403.13662 | Xiaoning Wu | Qin Liu, Xiaoning Wu and Xiao Zhang | Phase transition of modified thermodynamics of the Kerr-AdS black hole | 17 pages, 4 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the critical phenomena of Kerr-AdS black holes in the modified
first law of thermodynamics. It is demonstrated that the modified black hole
thermodynamics exhibits a van derWaals-like phase structure, with different
free energy.
| [
{
"created": "Wed, 20 Mar 2024 15:13:09 GMT",
"version": "v1"
}
] | 2024-03-21 | [
[
"Liu",
"Qin",
""
],
[
"Wu",
"Xiaoning",
""
],
[
"Zhang",
"Xiao",
""
]
] | We investigate the critical phenomena of Kerr-AdS black holes in the modified first law of thermodynamics. It is demonstrated that the modified black hole thermodynamics exhibits a van derWaals-like phase structure, with different free energy. |
gr-qc/9308009 | Dalia Goldwirth | Dalia S. Goldwirth, Malcolm J. Perry, Tsvi Piran and Kip S. Thorne | The Quantum Propagator for a Nonrelativistic Particle in the Vicinity of
a Time Machine | null | Phys.Rev. D49 (1994) 3951-3957 | 10.1103/PhysRevD.49.3951 | null | gr-qc astro-ph hep-th | null | We study the propagator of a non-relativistic, non-interacting particle in
any non-relativistic ``time-machine'' spacetime of the type shown in Fig.~1: an
external, flat spacetime in which two spatial regions, $V_-$ at time $t_-$ and
$V_+$ at time $t_+$, are connected by two temporal wormholes, one leading from
the p... | [
{
"created": "Tue, 10 Aug 1993 16:29:23 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Goldwirth",
"Dalia S.",
""
],
[
"Perry",
"Malcolm J.",
""
],
[
"Piran",
"Tsvi",
""
],
[
"Thorne",
"Kip S.",
""
]
] | We study the propagator of a non-relativistic, non-interacting particle in any non-relativistic ``time-machine'' spacetime of the type shown in Fig.~1: an external, flat spacetime in which two spatial regions, $V_-$ at time $t_-$ and $V_+$ at time $t_+$, are connected by two temporal wormholes, one leading from the pas... |
0908.3573 | Tomasz Konopka | Tomasz Konopka | Static Isotropic Spacetimes with Radially Imperfect Fluids | 15 pages, 4 figures. Accepted in IJMPD | null | 10.1142/S0218271809015345 | SPIN 09/26, ITP-UU 09/30 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When solving the equations of General Relativity in a symmetric sector, it is
natural to consider the same symmetry for the geometry and stress-energy. This
implies that for static and isotropic spacetimes, the most general natural
stress-energy tensor is a sum of a perfect fluid and a radial imperfect fluid
componen... | [
{
"created": "Tue, 25 Aug 2009 09:09:57 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Konopka",
"Tomasz",
""
]
] | When solving the equations of General Relativity in a symmetric sector, it is natural to consider the same symmetry for the geometry and stress-energy. This implies that for static and isotropic spacetimes, the most general natural stress-energy tensor is a sum of a perfect fluid and a radial imperfect fluid component.... |
1301.3291 | Giovanni Acquaviva | Giovanni Acquaviva | Quantum fields in gravity | 4 pages, no figures, contribution to the proceedings of the
conference "Relativity and Gravitation - 100 years after Einstein in Prague" | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a brief description of some compelling connections between general
relativity and thermodynamics through i) the semi-classical tunnelling
method(s) and ii) the field-theoretical modelling of Unruh-DeWitt detectors. In
both approaches it is possible to interpret some quantities in a
thermodynamical frame.
| [
{
"created": "Tue, 15 Jan 2013 10:22:07 GMT",
"version": "v1"
}
] | 2013-01-16 | [
[
"Acquaviva",
"Giovanni",
""
]
] | We give a brief description of some compelling connections between general relativity and thermodynamics through i) the semi-classical tunnelling method(s) and ii) the field-theoretical modelling of Unruh-DeWitt detectors. In both approaches it is possible to interpret some quantities in a thermodynamical frame. |
gr-qc/0202048 | Carlos Palenzuela | C.Bona and C.Palenzuela | Explicit Gravitational Radiation in Hyperbolic Systems for Numerical
Relativity | 9 pages, no figures | null | null | null | gr-qc | null | A method for studying the causal structure of space-time evolution systems is
presented. This method, based on a generalization of the well known Riemann
problem, provides intrinsic results which can be interpreted from the
geometrical point of view. A one-parameter family of hyperbolic evolution
systems is presented... | [
{
"created": "Thu, 14 Feb 2002 12:20:02 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Feb 2002 15:18:13 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bona",
"C.",
""
],
[
"Palenzuela",
"C.",
""
]
] | A method for studying the causal structure of space-time evolution systems is presented. This method, based on a generalization of the well known Riemann problem, provides intrinsic results which can be interpreted from the geometrical point of view. A one-parameter family of hyperbolic evolution systems is presented a... |
1310.5537 | Ko Sanders | Ko Sanders | On the construction of Hartle-Hawking-Israel states across a static
bifurcate Killing horizon | 50 pages, 2 figures, presented at GR20/Amaldi10 (Warsaw, 2013); v2:
filled technical gap in Sec.5, various small corrections; v3: typos
corrected, comparable to version accepted for publication, up to proofs left
to reader, style and punctuation | Lett Math Phys 105, no. 4 (2015), 575-640 | 10.1007/s11005-015-0745-2 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a linear scalar quantum field propagating in a space-time with a
static bifurcate Killing horizon and a wedge reflection. We prove the existence
of a Hadamard state which is pure, quasi-free, invariant under the Killing flow
and which restricts to a double KMS state at the inverse Hawking temperature on
t... | [
{
"created": "Mon, 21 Oct 2013 13:19:34 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Sep 2014 15:09:57 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Jan 2015 19:41:50 GMT",
"version": "v3"
}
] | 2015-03-24 | [
[
"Sanders",
"Ko",
""
]
] | We consider a linear scalar quantum field propagating in a space-time with a static bifurcate Killing horizon and a wedge reflection. We prove the existence of a Hadamard state which is pure, quasi-free, invariant under the Killing flow and which restricts to a double KMS state at the inverse Hawking temperature on the... |
1101.0364 | Yurii Ignatyev | Yurii G. Ignatyev | The Kinetics Of Nonequilibrium Universe. I. The Condition Of Local
Thermodynamical Equilibrium | 26 pages, 4 figures, 43 references | Grav.Cosmol.13:1-14,2007 | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In terms of fundamental principles of quantum theory of interacting particles
and relativistic kinetic theory there was carried out an analysis of the main
principle of standard cosmological scenario - the initial existence of local
thermodynamical equilibrium. It has been shown, that condition of the existence
of lo... | [
{
"created": "Sat, 1 Jan 2011 19:30:14 GMT",
"version": "v1"
}
] | 2011-06-21 | [
[
"Ignatyev",
"Yurii G.",
""
]
] | In terms of fundamental principles of quantum theory of interacting particles and relativistic kinetic theory there was carried out an analysis of the main principle of standard cosmological scenario - the initial existence of local thermodynamical equilibrium. It has been shown, that condition of the existence of loca... |
2007.09058 | Adil Belhaj | A. Belhaj, M. Benali, A. El Balali, W. El Hadri, H. El Moumni | Shadows of Charged and Rotating Black Holes with a Cosmological Constant | Latex, 17 pages, 8 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by recent astrophysical observations, we investigate the shadow
behaviors of four dimensional charged rotating black holes with a cosmological
constant. This study is made in terms of a reduced moduli space parameterized
by the charge and the rotation parameters. For a negative cosmological
constant, we ana... | [
{
"created": "Fri, 17 Jul 2020 15:34:22 GMT",
"version": "v1"
}
] | 2020-07-20 | [
[
"Belhaj",
"A.",
""
],
[
"Benali",
"M.",
""
],
[
"Balali",
"A. El",
""
],
[
"Hadri",
"W. El",
""
],
[
"Moumni",
"H. El",
""
]
] | Motivated by recent astrophysical observations, we investigate the shadow behaviors of four dimensional charged rotating black holes with a cosmological constant. This study is made in terms of a reduced moduli space parameterized by the charge and the rotation parameters. For a negative cosmological constant, we analy... |
gr-qc/0605020 | Kartheek Solipuram | Kartheek R Solipuram | Waves in the Griffiths-Podolsky Metric | 4 pages | null | null | null | gr-qc | null | Perturbations form an important section of black hole analyses. This paper
deals with the effect of perturbations as in the delineation of waves that
occur. It makes use of the spin coefficients from [3] to represent the general
equations of waves in an accelerating black hole proposed in [2].
| [
{
"created": "Tue, 2 May 2006 18:05:45 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2006 19:02:34 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Solipuram",
"Kartheek R",
""
]
] | Perturbations form an important section of black hole analyses. This paper deals with the effect of perturbations as in the delineation of waves that occur. It makes use of the spin coefficients from [3] to represent the general equations of waves in an accelerating black hole proposed in [2]. |
1602.01825 | Lin-Qing Chen | Lin-Qing Chen | Bulk amplitude and degree of divergence in 4d spin foams | 25+7 pages, 10 figures | Phys. Rev. D 94, 104025 (2016) | 10.1103/PhysRevD.94.104025 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the 4-d holomorphic Spin Foam amplitude on arbitrary connected
2-complexes and degrees of divergence. With recently developed tools and
truncation scheme, we derive a formula for a certain class of graphs, which
allows us to write down the value of bulk amplitudes simply based on graph
properties. We then ge... | [
{
"created": "Thu, 4 Feb 2016 20:50:34 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Chen",
"Lin-Qing",
""
]
] | We study the 4-d holomorphic Spin Foam amplitude on arbitrary connected 2-complexes and degrees of divergence. With recently developed tools and truncation scheme, we derive a formula for a certain class of graphs, which allows us to write down the value of bulk amplitudes simply based on graph properties. We then gene... |
0905.3686 | Mayeul Arminjon | Mayeul Arminjon and Frank Reifler | A non-uniqueness problem of the Dirac theory in a curved spacetime | 35 pages (standard article format). v4: Version accepted for
publication in Annalen der Physik: Redactional improvements and precisions
added in Section 2. Footnote added in the Conclusion, with new references.
v3: Introduction and Conclusion reinforced. References added. v2: subsection
2.3 added: the Lagrangia... | Annalen Phys.523:531-551,2011 | 10.1002/andp.201100060 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Dirac equation in a curved spacetime depends on a field of coefficients
(essentially the Dirac matrices), for which a continuum of different choices
are possible. We study the conditions under which a change of the coefficient
fields leads to an equivalent Hamiltonian operator H, or to an equivalent
energy operat... | [
{
"created": "Fri, 22 May 2009 13:58:43 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2009 16:56:02 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Mar 2010 14:32:41 GMT",
"version": "v3"
},
{
"created": "Fri, 27 May 2011 15:54:59 GMT",
"version": "v4"
}
] | 2011-07-14 | [
[
"Arminjon",
"Mayeul",
""
],
[
"Reifler",
"Frank",
""
]
] | The Dirac equation in a curved spacetime depends on a field of coefficients (essentially the Dirac matrices), for which a continuum of different choices are possible. We study the conditions under which a change of the coefficient fields leads to an equivalent Hamiltonian operator H, or to an equivalent energy operator... |
0901.2746 | Jerzy Matyjasek | Jerzy Matyjasek and Dariusz Tryniecki | Next-to-leading term of the renormalized stress-energy tensor of the
quantized massive scalar field in Schwarzschild spacetime. The back reaction | null | Phys.Rev.D79:084017,2009 | 10.1103/PhysRevD.79.084017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The next-to-leading term of the renormalized stress-energy tensor of the
quantized massive field with an arbitrary curvature coupling in the spacetime
of the Schwarzschild black hole is constructed. It is achieved by functional
differentiation of the DeWitt-Schwinger effective action involving coincidence
limit of th... | [
{
"created": "Sun, 18 Jan 2009 23:22:20 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Matyjasek",
"Jerzy",
""
],
[
"Tryniecki",
"Dariusz",
""
]
] | The next-to-leading term of the renormalized stress-energy tensor of the quantized massive field with an arbitrary curvature coupling in the spacetime of the Schwarzschild black hole is constructed. It is achieved by functional differentiation of the DeWitt-Schwinger effective action involving coincidence limit of the ... |
0710.1219 | Daniele Pranzetti | Giovanni Amelino-Camelia, Giulia Gubitosi, Antonino Marciano, Pierre
Martinetti, Flavio Mercati, Daniele Pranzetti, Ruggero Altair Tacchi | First results of the Noether theorem for Hopf-algebra spacetime
symmetries | 14 pages, Based in part on the lecture given by G.A.-C. at the 21st
Nishinomiya-Yukawa Memorial Symposium "Noncommutative geometry and quantum
spacetime in physics", but updated with the results of our recent papers
arXiv:0707.1863 arXiv:0709.2063 arXiv:0709.4600 | Prog.Theor.Phys.Suppl.171:65-78,2007 | 10.1143/PTPS.171.65 | null | gr-qc | null | We summarize here the first results obtained using a technique we recently
developed for the Noether analysis of Hopf-algebra spacetime symmetries,
including the derivation of conserved charges for field theories in
noncommutative spacetimes of canonical or kappa-Minkowski type.
| [
{
"created": "Fri, 5 Oct 2007 13:54:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Gubitosi",
"Giulia",
""
],
[
"Marciano",
"Antonino",
""
],
[
"Martinetti",
"Pierre",
""
],
[
"Mercati",
"Flavio",
""
],
[
"Pranzetti",
"Daniele",
""
],
[
"Tacchi",
"Rugge... | We summarize here the first results obtained using a technique we recently developed for the Noether analysis of Hopf-algebra spacetime symmetries, including the derivation of conserved charges for field theories in noncommutative spacetimes of canonical or kappa-Minkowski type. |
1106.2314 | Bibekananda Nayak jr | B. Nayak and L. P. Singh | Phantom energy accretion and primordial black holes evolution in
Brans-Dicke theory | 9 pages | Eur. Phys. J. C 71, 1837 (2011) | 10.1140/epjc/s10052-011-1837-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the evolution of primordial black holes within the
context of Brans-Dicke theory by considering the presence of a dark energy
component with a super-negative equation of state called phantom energy as a
background. Besides Hawking evaporation, here we consider two type of
accretions - radiation... | [
{
"created": "Sun, 12 Jun 2011 14:46:49 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Nayak",
"B.",
""
],
[
"Singh",
"L. P.",
""
]
] | In this work, we study the evolution of primordial black holes within the context of Brans-Dicke theory by considering the presence of a dark energy component with a super-negative equation of state called phantom energy as a background. Besides Hawking evaporation, here we consider two type of accretions - radiation a... |
1807.03278 | Grigoris Panotopoulos | Grigoris Panotopoulos | Electromagnetic quasinormal modes of the nearly-extremal
higher-dimensional Schwarzschild-de Sitter black hole | Reference added | null | 10.1142/S0217732318501304 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain an analytical expression for the electromagnetic quasinormal
spectrum of the higher-dimensional nearly-extremal Schwarzschild-de Sitter
black hole. The WKB method is used to verify the results, and a comparison with
known results from previous works is briefly made as well.
| [
{
"created": "Mon, 9 Jul 2018 17:21:24 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Aug 2018 16:00:02 GMT",
"version": "v2"
}
] | 2018-08-27 | [
[
"Panotopoulos",
"Grigoris",
""
]
] | We obtain an analytical expression for the electromagnetic quasinormal spectrum of the higher-dimensional nearly-extremal Schwarzschild-de Sitter black hole. The WKB method is used to verify the results, and a comparison with known results from previous works is briefly made as well. |
gr-qc/9609069 | Hartmut Frommert | Hartmut Frommert, Holger Schoor, Heinz Dehnen | The cosmological background in the Higgs scalar-tensor theory without
Higgs particles | 15 pages, no figures, LaTeX 2.09 file. Submitted to Nuclear Physics B | Int.J.Theor.Phys. 38 (1999) 725-735 | null | null | gr-qc hep-th | null | The scalar background field and its consequences are discussed for the
Friedmann type cosmological solutions of the scalar-tensor theory of gravity
with the Higgs field of the Standard Model as the scalar gravitational field.
| [
{
"created": "Mon, 30 Sep 1996 11:40:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Frommert",
"Hartmut",
""
],
[
"Schoor",
"Holger",
""
],
[
"Dehnen",
"Heinz",
""
]
] | The scalar background field and its consequences are discussed for the Friedmann type cosmological solutions of the scalar-tensor theory of gravity with the Higgs field of the Standard Model as the scalar gravitational field. |
0706.2511 | Izzet Sakalli | I.Sakalli and M.Halilsoy | Chaos in Kundt type III Spacetimes | 4 Figures | Chin.Phys.Lett.28:070402,2011 | 10.1088/0256-307X/28/7/070402 | null | gr-qc | null | We consider geodesics motion in a particular Kundt type III spacetime in
which Einstein-Yang-Mills equations admit solutions. On a particular surface as
constraint we project the geodesics into the (x,y) plane and treat the problem
as a 2-dimensional one. Our numerical study shows that chaotic behavior emerges
under ... | [
{
"created": "Sun, 17 Jun 2007 22:39:02 GMT",
"version": "v1"
}
] | 2011-07-28 | [
[
"Sakalli",
"I.",
""
],
[
"Halilsoy",
"M.",
""
]
] | We consider geodesics motion in a particular Kundt type III spacetime in which Einstein-Yang-Mills equations admit solutions. On a particular surface as constraint we project the geodesics into the (x,y) plane and treat the problem as a 2-dimensional one. Our numerical study shows that chaotic behavior emerges under re... |
1907.08312 | Preston Jones | Preston Jones, Douglas Singleton | Production of electromagnetic and sound radiation from gravitational
waves in core-collapse supernovae | Updated paper to include phonon production by gravitational waves.
Submitted to IJMPD | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents the scenario that gravitational waves, generated in
core-collapse of a pre-supernova star, can produce both electromagnetic
radiation and sound radiation as the gravitational wave propagates outward from
the collapsing core. While the energy of this co-produced electromagnetic
and/or sound radiati... | [
{
"created": "Thu, 18 Jul 2019 22:21:43 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Aug 2023 20:38:42 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Jones",
"Preston",
""
],
[
"Singleton",
"Douglas",
""
]
] | This paper presents the scenario that gravitational waves, generated in core-collapse of a pre-supernova star, can produce both electromagnetic radiation and sound radiation as the gravitational wave propagates outward from the collapsing core. While the energy of this co-produced electromagnetic and/or sound radiation... |
gr-qc/0012006 | Tomas Ledvinka | Jiri Bicak and Tomas Ledvinka | Electromagnetic fields around black holes and Meissner effect | 12 pages, 3 figures | Nuovo Cim.B115:739-749,2000 | null | null | gr-qc | null | The work on black holes immersed in external stationary magnetic fields is
reviewed in both test-field approximation and within exact solutions. In
particular we pay attention to the effect of the expulsion of the flux of
external fields across charged and rotating black holes which are approaching
extremal states. R... | [
{
"created": "Fri, 1 Dec 2000 19:03:44 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Bicak",
"Jiri",
""
],
[
"Ledvinka",
"Tomas",
""
]
] | The work on black holes immersed in external stationary magnetic fields is reviewed in both test-field approximation and within exact solutions. In particular we pay attention to the effect of the expulsion of the flux of external fields across charged and rotating black holes which are approaching extremal states. Rec... |
gr-qc/0404082 | Gilberto Medeiros Kremer | Gilberto M. Kremer, Daniele S. M. Alves | Palatini approach to 1/R gravity and its implications to the late
Universe | 5 pages and 2 figures. Accepted in PRD | Phys.Rev. D70 (2004) 023503 | 10.1103/PhysRevD.70.023503 | null | gr-qc | null | By applying the Palatini approach to the 1/R-gravity model it is possible to
explain the present accelerated expansion of the Universe. Investigation of the
late Universe limiting case shows that: (i) due to the curvature effects the
energy-momentum tensor of the matter field is not covariantly conserved; (ii)
howeve... | [
{
"created": "Mon, 19 Apr 2004 18:54:21 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kremer",
"Gilberto M.",
""
],
[
"Alves",
"Daniele S. M.",
""
]
] | By applying the Palatini approach to the 1/R-gravity model it is possible to explain the present accelerated expansion of the Universe. Investigation of the late Universe limiting case shows that: (i) due to the curvature effects the energy-momentum tensor of the matter field is not covariantly conserved; (ii) however,... |
1504.01138 | Antonio C. Guti\'errez-Pi\~neres | Antonio C. Guti\'errez-Pi\~neres and Abra\~ao J. S. Capistrano | Exact Relativistic Magnetized halos around Rotating Disks | New improved version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact relativistic treatment of a rotating disk surrounded by a
magnetized material halo is presented. The features of the halo and disk are
described by the distributional energy-momentum tensor of a general fluid in
canonical form. All the relevant quantities and the metric and electromagnetic
potentials are ex... | [
{
"created": "Sun, 5 Apr 2015 16:58:25 GMT",
"version": "v1"
},
{
"created": "Fri, 15 May 2015 02:03:00 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Gutiérrez-Piñeres",
"Antonio C.",
""
],
[
"Capistrano",
"Abraão J. S.",
""
]
] | The exact relativistic treatment of a rotating disk surrounded by a magnetized material halo is presented. The features of the halo and disk are described by the distributional energy-momentum tensor of a general fluid in canonical form. All the relevant quantities and the metric and electromagnetic potentials are exac... |
1611.00332 | Xisco Jimenez-Forteza | Xisco Jim\'enez-Forteza, David Keitel, Sascha Husa, Mark Hannam,
Sebastian Khan, Michael P\"urrer | Hierarchical data-driven approach to fitting numerical relativity data
for nonprecessing binary black holes with an application to final spin and
radiated energy | 23 pages, 31 figures, 15 tables; data and example implementations as
supplementary material. Updated to match PRD version | Phys. Rev. D 95, 064024 (2017) | 10.1103/PhysRevD.95.064024 | LIGO-P1600270 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical relativity is an essential tool in studying the coalescence of
binary black holes (BBHs). It is still computationally prohibitive to cover the
BBH parameter space exhaustively, making phenomenological fitting formulas for
BBH waveforms and final-state properties important for practical applications.
We desc... | [
{
"created": "Tue, 1 Nov 2016 18:53:02 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2017 16:01:06 GMT",
"version": "v2"
}
] | 2017-03-28 | [
[
"Jiménez-Forteza",
"Xisco",
""
],
[
"Keitel",
"David",
""
],
[
"Husa",
"Sascha",
""
],
[
"Hannam",
"Mark",
""
],
[
"Khan",
"Sebastian",
""
],
[
"Pürrer",
"Michael",
""
]
] | Numerical relativity is an essential tool in studying the coalescence of binary black holes (BBHs). It is still computationally prohibitive to cover the BBH parameter space exhaustively, making phenomenological fitting formulas for BBH waveforms and final-state properties important for practical applications. We descri... |
1509.07954 | Xuefeng Zhang | Xuefeng Zhang and Xinliang An | Naked singularity and black hole formation in self-similar
Einstein-scalar fields with exponential potentials | 24 pages, 6 figures; minor changes, more references added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by cosmic censorship in general relativity and string theory, we
extend Christodoulou's celebrated examples of naked singularity formation in
the Einstein-massless scalar field system to include a positive or negative
scalar potential of exponential forms, i.e., $V(\phi)=\pm\exp(2\phi/\kappa)$
with a parame... | [
{
"created": "Sat, 26 Sep 2015 09:23:28 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 2015 07:00:11 GMT",
"version": "v2"
}
] | 2018-02-06 | [
[
"Zhang",
"Xuefeng",
""
],
[
"An",
"Xinliang",
""
]
] | Motivated by cosmic censorship in general relativity and string theory, we extend Christodoulou's celebrated examples of naked singularity formation in the Einstein-massless scalar field system to include a positive or negative scalar potential of exponential forms, i.e., $V(\phi)=\pm\exp(2\phi/\kappa)$ with a paramete... |
2304.11843 | Bibhas Majhi Ranjan | Bibhas Ranjan Majhi | Laws of thermodynamic equilibrium through relativistic thermodynamics | Generalisation of the results shown, typos corrected, references
added | null | null | null | gr-qc hep-th physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using Israel-Stewart formalism for the description of thermodynamics of an
arbitrary relativistic fluid we propose generalization of Tolman-Ehrenfest
relation and Klein's law on a general background spacetime. The first relation
is a consequence of thermal equilibrium only of a non-viscous fluid, while the
latter one... | [
{
"created": "Mon, 24 Apr 2023 06:22:11 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Apr 2023 05:19:39 GMT",
"version": "v2"
}
] | 2023-05-01 | [
[
"Majhi",
"Bibhas Ranjan",
""
]
] | Using Israel-Stewart formalism for the description of thermodynamics of an arbitrary relativistic fluid we propose generalization of Tolman-Ehrenfest relation and Klein's law on a general background spacetime. The first relation is a consequence of thermal equilibrium only of a non-viscous fluid, while the latter one i... |
2211.05817 | Ra\'ul Carballo-Rubio | Ra\'ul Carballo-Rubio, Francesco Di Filippo, Stefano Liberati and Matt
Visser | A connection between regular black holes and horizonless ultracompact
stars | 29 pages with references, 6 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We illustrate that regular black holes and horizonless stars, typically
considered as quite distinct families of black hole mimickers, are intimately
intertwined. We show that any spherically symmetric regular black hole can be
continuously deformed into a horizonless star under the mild conditions of
non-negativity ... | [
{
"created": "Thu, 10 Nov 2022 19:20:23 GMT",
"version": "v1"
}
] | 2022-11-14 | [
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Di Filippo",
"Francesco",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Visser",
"Matt",
""
]
] | We illustrate that regular black holes and horizonless stars, typically considered as quite distinct families of black hole mimickers, are intimately intertwined. We show that any spherically symmetric regular black hole can be continuously deformed into a horizonless star under the mild conditions of non-negativity of... |
1810.05513 | Antonino Marciano | Andrea Addazi and Antonino Marciano | Quantum Ekpyrotic mechanism in Fermi-bounce curvaton cosmology | 7 pages, 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the context of the Fermi-bounce curvaton mechanism, we analyze the
one-loop radiative corrections to the four fermion interaction, generated by
the non-dynamical torsion field in the Einstein-Cartan-Holst-Sciama-Kibble
theory. We show that contributions that arise from the one-loop radiative
corrections modify... | [
{
"created": "Fri, 12 Oct 2018 13:51:05 GMT",
"version": "v1"
}
] | 2018-10-15 | [
[
"Addazi",
"Andrea",
""
],
[
"Marciano",
"Antonino",
""
]
] | Within the context of the Fermi-bounce curvaton mechanism, we analyze the one-loop radiative corrections to the four fermion interaction, generated by the non-dynamical torsion field in the Einstein-Cartan-Holst-Sciama-Kibble theory. We show that contributions that arise from the one-loop radiative corrections modify t... |
2303.01413 | Vitalii Vertogradov | Vitalii Vertogradov, Dmitriy Kudryavcev | On the temperature of hairy black holes | 14 pages, 4 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The gravitational decoupling method represents an extremely useful tool to
obtain new solutions of the Einstein equations through minimal geometrical
deformations. In this paper, we consider the hairy charged black hole obtained
by the gravitational decoupling and calculate their Hawking temperature in
order to compa... | [
{
"created": "Thu, 2 Mar 2023 17:03:07 GMT",
"version": "v1"
}
] | 2023-03-03 | [
[
"Vertogradov",
"Vitalii",
""
],
[
"Kudryavcev",
"Dmitriy",
""
]
] | The gravitational decoupling method represents an extremely useful tool to obtain new solutions of the Einstein equations through minimal geometrical deformations. In this paper, we consider the hairy charged black hole obtained by the gravitational decoupling and calculate their Hawking temperature in order to compare... |
gr-qc/0509039 | Alejandro Corichi | Alejandro Corichi and Alberto Hauser | Bibliography of Publications related to Classical Self-dual variables
and Loop Quantum Gravity | 46 pages | null | null | null | gr-qc | null | This bibliography attempts to give a comprehensive overview of all the
literature related to what is known as the Ashtekar-Sen connection and the
Rovelli-Smolin loop variables, from which the program currently known as Loop
Quantum Gravity emerged. The original version was compiled by Peter Huebner in
1989, and it ha... | [
{
"created": "Mon, 12 Sep 2005 18:49:12 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Sep 2005 15:56:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Corichi",
"Alejandro",
""
],
[
"Hauser",
"Alberto",
""
]
] | This bibliography attempts to give a comprehensive overview of all the literature related to what is known as the Ashtekar-Sen connection and the Rovelli-Smolin loop variables, from which the program currently known as Loop Quantum Gravity emerged. The original version was compiled by Peter Huebner in 1989, and it has ... |
2007.06553 | Umananda Dev Goswami | Jyatsnasree Bora and Umananda Dev Goswami | Radial oscillations and gravitational wave echoes of strange stars for
various equations of state | 15 pages, 13 figures, published version in MNRAS | Monthly Notices of the Royal Astronomical Society 502, 1557-1568
(2021) | 10.1093/mnras/stab050 | null | gr-qc astro-ph.HE astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | We study the radial oscillations of non-rotating strange stars and their
characteristic echo frequencies for three Equations of state (EoSs), viz., MIT
Bag model EoS, linear EoS and polytropic EoS. The frequencies of radial
oscillations of these compact stars are computed for these EoSs. 22 lowest
radial frequencies ... | [
{
"created": "Fri, 10 Jul 2020 11:40:00 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2021 06:49:21 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Feb 2021 09:58:41 GMT",
"version": "v3"
}
] | 2021-02-10 | [
[
"Bora",
"Jyatsnasree",
""
],
[
"Goswami",
"Umananda Dev",
""
]
] | We study the radial oscillations of non-rotating strange stars and their characteristic echo frequencies for three Equations of state (EoSs), viz., MIT Bag model EoS, linear EoS and polytropic EoS. The frequencies of radial oscillations of these compact stars are computed for these EoSs. 22 lowest radial frequencies fo... |
gr-qc/0605063 | Marcelo S. Berman | Marcelo Samuel Berman | On the Zero-energy Universe | 14 pages, to be published by International Journal of Theoretical
Physics | Int.J.Theor. Phys.48:3278,2009 | 10.1007/s10773-009-0125-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the energy of the Universe, from the pseudo-tensor point of
view(Berman,1981). We find zero values, when the calculations are well-done.The
doubts concerning this subject are clarified, with the novel idea that the
justification for the calculation lies in the association of the equivalence
principle, wit... | [
{
"created": "Thu, 11 May 2006 03:14:37 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Jun 2006 00:36:10 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Aug 2009 13:39:51 GMT",
"version": "v3"
}
] | 2010-12-20 | [
[
"Berman",
"Marcelo Samuel",
""
]
] | We consider the energy of the Universe, from the pseudo-tensor point of view(Berman,1981). We find zero values, when the calculations are well-done.The doubts concerning this subject are clarified, with the novel idea that the justification for the calculation lies in the association of the equivalence principle, with ... |
gr-qc/0401056 | Alexander E. Shalyt-Margolin | A.E.Shalyt-Margolin | Some Implications of the Density Matrix Deformation in Statistical
Mechanics of the Early Universe | 11 pages, no figures | null | null | null | gr-qc | null | This work is an extension of the study into statistical mechanics of the
early Universe that has been the subject in prior works of the author, the
principal approach being the density matrix deformation. In the work it is
demonstrated that the previously derived exponential ansatz may be successfully
applied to the ... | [
{
"created": "Tue, 13 Jan 2004 14:45:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shalyt-Margolin",
"A. E.",
""
]
] | This work is an extension of the study into statistical mechanics of the early Universe that has been the subject in prior works of the author, the principal approach being the density matrix deformation. In the work it is demonstrated that the previously derived exponential ansatz may be successfully applied to the de... |
0708.1747 | Valeria Kagramanova | Valeria Kagramanova, Jutta Kunz and Claus Laemmerzahl | Orbits in the Field of a Gravitating Magnetic Monopole | 24 pages, 15 figures. Accepted for publication in GRG | Gen.Rel.Grav.40:1249-1278,2008 | 10.1007/s10714-007-0602-4 | null | gr-qc | null | Orbits of test particles and light rays are an important tool to study the
properties of space-time metrics. Here we systematically study the properties
of the gravitational field of a globally regular magnetic monopole in terms of
the geodesics of test particles and light. The gravitational field depends on
two dime... | [
{
"created": "Mon, 13 Aug 2007 19:38:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kagramanova",
"Valeria",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Laemmerzahl",
"Claus",
""
]
] | Orbits of test particles and light rays are an important tool to study the properties of space-time metrics. Here we systematically study the properties of the gravitational field of a globally regular magnetic monopole in terms of the geodesics of test particles and light. The gravitational field depends on two dimens... |
1109.4688 | Hanno Sahlmann | Tim Koslowski and Hanno Sahlmann | Loop Quantum Gravity Vacuum with Nondegenerate Geometry | null | SIGMA 8 (2012), 026, 15 pages | 10.3842/SIGMA.2012.026 | APCTP Pre2011-012 | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/3.0/ | In loop quantum gravity, states of the gravitational field turn out to be
excitations over a vacuum state that is sharply peaked on a degenerate spatial
geometry. While this vacuum is singled out as fundamental due to its invariance
properties, it is also important to consider states that describe
non-degenerate geom... | [
{
"created": "Thu, 22 Sep 2011 02:08:29 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2012 06:12:12 GMT",
"version": "v2"
}
] | 2012-05-15 | [
[
"Koslowski",
"Tim",
""
],
[
"Sahlmann",
"Hanno",
""
]
] | In loop quantum gravity, states of the gravitational field turn out to be excitations over a vacuum state that is sharply peaked on a degenerate spatial geometry. While this vacuum is singled out as fundamental due to its invariance properties, it is also important to consider states that describe non-degenerate geomet... |
gr-qc/0103098 | Anjan Ananda Sen | A.A.Sen and S.Sen | Cosmology in scalar tensor theory and asymptotically de-Sitter Universe | 7 pages, Revtex Style, 6 Postscript figures | Mod.Phys.Lett.A16:1303-1314,2001 | 10.1142/S021773230100442X | MRI-P-010303 | gr-qc | null | We have investigated the cosmological scenarios with a four dimensional
effective action which is connected with multidimensional, supergravity and
string theories. The solution for the scale factor is such that initially
universe undergoes a decelerated expansion but in late times it enters into the
accelerated expa... | [
{
"created": "Tue, 27 Mar 2001 17:09:39 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Sen",
"A. A.",
""
],
[
"Sen",
"S.",
""
]
] | We have investigated the cosmological scenarios with a four dimensional effective action which is connected with multidimensional, supergravity and string theories. The solution for the scale factor is such that initially universe undergoes a decelerated expansion but in late times it enters into the accelerated expans... |
1903.00918 | Shabbir Ghulam | Ghulam Shabbir, Fiaz Hussain, A. H. Kara, Muhammad Ramzan | A note on some perfect fluid Kantowski-Sachs and Bianchi type III
space-times and their conformal vector fields in f(R) theory of gravity | 12 pages | Modern Physics Letters A in 2019 | 10.1142/S0217732319500792 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to find conformal vector fields of some perfect
fluid Kantowski-Sachs and Bianchi type III space-times in the f(R) theory of
gravity using direct integration technique. In this study there exists only
eight cases. Studying each case in detail, we found that in two cases proper
conformal v... | [
{
"created": "Sun, 3 Mar 2019 14:34:24 GMT",
"version": "v1"
}
] | 2019-04-17 | [
[
"Shabbir",
"Ghulam",
""
],
[
"Hussain",
"Fiaz",
""
],
[
"Kara",
"A. H.",
""
],
[
"Ramzan",
"Muhammad",
""
]
] | The purpose of this paper is to find conformal vector fields of some perfect fluid Kantowski-Sachs and Bianchi type III space-times in the f(R) theory of gravity using direct integration technique. In this study there exists only eight cases. Studying each case in detail, we found that in two cases proper conformal vec... |
2202.09833 | Leonardo Garc\'ia-Heveling | Leonardo Garc\'ia-Heveling | Topology change with Morse functions: progress on the Borde-Sorkin
conjecture | Small changes in v3: typos fixed, added reference to Yodzis in
introduction. To appear in Adv. Theor. Math. Phys. 23 pages, 8 figures | Advances in Theoretical and Mathematical Physics, Vol. 27, No. 4
(2023), pp. 1159-1190 | 10.4310/ATMP.2023.v27.n4.a4 | null | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Topology change is considered to be a necessary feature of quantum gravity by
some authors, and impossible by others. One of the main arguments against it is
that spacetimes with changing spatial topology have bad causal properties.
Borde and Sorkin proposed a way to avoid this dilemma by considering topology
changin... | [
{
"created": "Sun, 20 Feb 2022 15:19:36 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2022 11:55:10 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Dec 2022 14:31:32 GMT",
"version": "v3"
},
{
"created": "Tue, 13 Feb 2024 08:26:10 GMT",
"version": "v4"
}
] | 2024-06-13 | [
[
"García-Heveling",
"Leonardo",
""
]
] | Topology change is considered to be a necessary feature of quantum gravity by some authors, and impossible by others. One of the main arguments against it is that spacetimes with changing spatial topology have bad causal properties. Borde and Sorkin proposed a way to avoid this dilemma by considering topology changing ... |
gr-qc/0601047 | Z. Y. Turakulov | Z. Ya. Turakulov, A. T. Muminov | Electromagnetic field with constraints and Papapetrou equation | 11 pages, PDF file | null | 10.1515/zna-2006-3-407 | null | gr-qc | null | It is shown that geometric optical description of electromagnetic wave with
account of its polarization in curved space-time can be obtained
straightforwardly from the classical variational principle for electromagnetic
field. For this end the entire functional space of electromagnetic fields must
be reduced to its s... | [
{
"created": "Thu, 12 Jan 2006 04:45:51 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Turakulov",
"Z. Ya.",
""
],
[
"Muminov",
"A. T.",
""
]
] | It is shown that geometric optical description of electromagnetic wave with account of its polarization in curved space-time can be obtained straightforwardly from the classical variational principle for electromagnetic field. For this end the entire functional space of electromagnetic fields must be reduced to its sub... |
1703.09131 | Henrique de Oliveira | P. C. M. Clemente and H. P. de Oliveira | Puncture black hole initial data: a single domain Galerkin-Collocation
method for trumpet and wormhole data sets | 9 figures | Phys. Rev. D 96, 024035 (2017) | 10.1103/PhysRevD.96.024035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a single domain Galerkin-Collocation method to calculate puncture
initial data sets for single and binary, either in the trumpet or wormhole
geometries. The combination of aspects belonging to the Galerkin and the
Collocation methods together with the adoption of spherical coordinates in all
cases show to ... | [
{
"created": "Mon, 27 Mar 2017 15:03:48 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Clemente",
"P. C. M.",
""
],
[
"de Oliveira",
"H. P.",
""
]
] | We present a single domain Galerkin-Collocation method to calculate puncture initial data sets for single and binary, either in the trumpet or wormhole geometries. The combination of aspects belonging to the Galerkin and the Collocation methods together with the adoption of spherical coordinates in all cases show to be... |
1604.08247 | Elena Kopteva | Maria Korkina, Elena Kopteva | The mass function method for obtaining exact solutions of Einstein
equations | null | Space, Time and Fundamental Interactions. 2012. V. 1, p. 38 - 47 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the mass function method makes it much easier to obtain the
exact solutions of Einstein equations. The known solutions for empty space and
for the universe filled with dust-like matter are considered from the point of
view of the method and new exact solutions are obtained. Generalized solutions
for the ... | [
{
"created": "Wed, 27 Apr 2016 21:12:00 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2016 09:16:10 GMT",
"version": "v2"
}
] | 2016-05-02 | [
[
"Korkina",
"Maria",
""
],
[
"Kopteva",
"Elena",
""
]
] | We show that the mass function method makes it much easier to obtain the exact solutions of Einstein equations. The known solutions for empty space and for the universe filled with dust-like matter are considered from the point of view of the method and new exact solutions are obtained. Generalized solutions for the Sc... |
2309.13140 | Emilio Rub\'in de Celis | E. Rub\'in de Celis and C. Simeone | Tides across thin-shells: differences between spacetimes with one and
two asymptotic regions | 13 pages. No figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Traversability across thin shells is investigated, with special attention
devoted to the difference in tides related with different global properties of
the geometries. While we have recently associated curvature jumps across
infinitely thin shells to troublesome tides and consequent very restrictive
conditions for a... | [
{
"created": "Fri, 22 Sep 2023 18:50:20 GMT",
"version": "v1"
}
] | 2023-09-26 | [
[
"de Celis",
"E. Rubín",
""
],
[
"Simeone",
"C.",
""
]
] | Traversability across thin shells is investigated, with special attention devoted to the difference in tides related with different global properties of the geometries. While we have recently associated curvature jumps across infinitely thin shells to troublesome tides and consequent very restrictive conditions for a s... |
2301.02847 | Haomin Rao | Mingzhe Li and Haomin Rao | Irregular universe in the Nieh-Yan modified teleparallel gravity | 20 pages, 1 figures, irregular universe, teleparallel gravity | null | 10.1016/j.physletb.2023.137929 | USTC-ICTS/PCFT-22-27 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The Nieh-Yan modified teleparallel gravity is a model which modifies the
general relativity equivalent teleparallel gravity by a coupling between the
Nieh-Yan density and an axion-like field. This model predicts parity violations
in the gravitational waves if the axion-like field has a non-trivial
background, and mor... | [
{
"created": "Sat, 7 Jan 2023 13:20:56 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Apr 2023 01:49:40 GMT",
"version": "v2"
}
] | 2023-05-17 | [
[
"Li",
"Mingzhe",
""
],
[
"Rao",
"Haomin",
""
]
] | The Nieh-Yan modified teleparallel gravity is a model which modifies the general relativity equivalent teleparallel gravity by a coupling between the Nieh-Yan density and an axion-like field. This model predicts parity violations in the gravitational waves if the axion-like field has a non-trivial background, and more ... |
1210.1402 | Harvey S. Reall | Harvey S. Reall | Higher dimensional black holes | Contribution to the proceedings of "Relativity and Gravitation - 100
years after Einstein in Prague" (Prague, June 2012) and the 13th Marcel
Grossmann Meeting (Stockholm, July 2012). v2: references added | null | 10.1142/S0218271812300017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article reviews black hole solutions of higher-dimensional General
Relativity. The focus is on stationary vacuum solutions and recent work on
instabilities of such solutions.
| [
{
"created": "Thu, 4 Oct 2012 12:03:48 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2012 08:52:00 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Reall",
"Harvey S.",
""
]
] | This article reviews black hole solutions of higher-dimensional General Relativity. The focus is on stationary vacuum solutions and recent work on instabilities of such solutions. |
gr-qc/9312013 | Joakim Hallin | J. Hallin | Representations of the $SU(N)$ $T$-algebra and the loop representation
in $1+1$-dimensions | 15 pages, LaTeX, 1 postscript figure included, uses epsf.sty,
G\"oteborg ITP 93-39 | Class.Quant.Grav.11:1615-1630,1994 | 10.1088/0264-9381/11/7/005 | null | gr-qc | null | We consider the phase-space of Yang-Mills on a cylindrical space-time ($S^1
\times {\bf R}$) and the associated algebra of gauge-invariant functions, the
$T$-variables. We solve the Mandelstam identities both classically and
quantum-mechanically by considering the $T$-variables as functions of the
eigenvalues of the ... | [
{
"created": "Tue, 7 Dec 1993 14:50:59 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Hallin",
"J.",
""
]
] | We consider the phase-space of Yang-Mills on a cylindrical space-time ($S^1 \times {\bf R}$) and the associated algebra of gauge-invariant functions, the $T$-variables. We solve the Mandelstam identities both classically and quantum-mechanically by considering the $T$-variables as functions of the eigenvalues of the ho... |
1005.4480 | Muhammad Sharif | M. Sharif and M. Zubair | Dynamics of Bianchi I Universe with Magnetized Anisotropic Dark Energy | 16 pages, 2 figures, accepted for publication in Astrophys. Space Sci | Astrophys.Space Sci.330:399-405,2010 | 10.1007/s10509-010-0414-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Bianchi type $I$ cosmological model in the presence of magnetized
anisotropic dark energy. The energy-momentum tensor consists of anisotropic
fluid with anisotropic EoS $p=\omega{\rho}$ and a uniform magnetic field of
energy density $\rho_B$. We obtain exact solutions to the field equations using
the conditi... | [
{
"created": "Tue, 25 May 2010 04:28:12 GMT",
"version": "v1"
}
] | 2010-11-03 | [
[
"Sharif",
"M.",
""
],
[
"Zubair",
"M.",
""
]
] | We study Bianchi type $I$ cosmological model in the presence of magnetized anisotropic dark energy. The energy-momentum tensor consists of anisotropic fluid with anisotropic EoS $p=\omega{\rho}$ and a uniform magnetic field of energy density $\rho_B$. We obtain exact solutions to the field equations using the condition... |
gr-qc/0201070 | Jonathan Halliwell | J.J.Halliwell and J.Thorwart | Life in an Energy Eigenstate: Decoherent Histories Analysis of a Model
Timeless Universe | 57 pages, plain Tex, 1 figure | Phys.Rev. D65 (2002) 104009 | 10.1103/PhysRevD.65.104009 | IC/TP/1-02/13 | gr-qc | null | Inspired by quantum cosmology, in which the wave function of the universe is
annihilated by the total Hamiltonian, we consider the internal dynamics of a
simple particle system in an energy eigenstate. Such a system does not possess
a uniquely defined time parameter and all physical questions about it must be
posed w... | [
{
"created": "Mon, 21 Jan 2002 18:02:12 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Halliwell",
"J. J.",
""
],
[
"Thorwart",
"J.",
""
]
] | Inspired by quantum cosmology, in which the wave function of the universe is annihilated by the total Hamiltonian, we consider the internal dynamics of a simple particle system in an energy eigenstate. Such a system does not possess a uniquely defined time parameter and all physical questions about it must be posed wit... |
1711.00855 | Peter Zimmerman | Samuel E. Gralla and Peter Zimmerman | Critical Exponents of Extremal Kerr Perturbations | 21 pages. v2 updated to match published version | Classical and Quantum Gravity, Volume 35 (2018), Number 9 | 10.1088/1361-6382/aab140 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that scalar, electromagnetic, and gravitational perturbations of
extremal Kerr black holes are asymptotically self-similar under the
near-horizon, late-time scaling symmetry of the background metric. This
accounts for the Aretakis instability (growth of transverse derivatives) as a
critical phenomenon associa... | [
{
"created": "Thu, 2 Nov 2017 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2017 20:45:21 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Apr 2018 00:05:51 GMT",
"version": "v3"
}
] | 2018-04-03 | [
[
"Gralla",
"Samuel E.",
""
],
[
"Zimmerman",
"Peter",
""
]
] | We show that scalar, electromagnetic, and gravitational perturbations of extremal Kerr black holes are asymptotically self-similar under the near-horizon, late-time scaling symmetry of the background metric. This accounts for the Aretakis instability (growth of transverse derivatives) as a critical phenomenon associate... |
gr-qc/0310024 | Felix Finster | Felix Finster, Niky Kamran, Joel Smoller, and Shing-Tung Yau | An Integral Spectral Representation of the Propagator for the Wave
Equation in the Kerr Geometry | 41 pages, 4 figures, minor corrections | Commun.Math.Phys. 260 (2005) 257-298 | 10.1007/s00220-005-1390-x | null | gr-qc astro-ph math-ph math.MP | null | We consider the scalar wave equation in the Kerr geometry for Cauchy data
which is smooth and compactly supported outside the event horizon. We derive an
integral representation which expresses the solution as a superposition of
solutions of the radial and angular ODEs which arise in the separation of
variables. In p... | [
{
"created": "Sat, 4 Oct 2003 22:52:51 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jul 2004 09:44:11 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Apr 2005 17:53:12 GMT",
"version": "v3"
},
{
"created": "Wed, 6 Jul 2005 16:21:51 GMT",
"version": "v4"
},
{
"cre... | 2009-11-10 | [
[
"Finster",
"Felix",
""
],
[
"Kamran",
"Niky",
""
],
[
"Smoller",
"Joel",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | We consider the scalar wave equation in the Kerr geometry for Cauchy data which is smooth and compactly supported outside the event horizon. We derive an integral representation which expresses the solution as a superposition of solutions of the radial and angular ODEs which arise in the separation of variables. In par... |
gr-qc/0404096 | Innocenzo M. Pinto | R. P. Croce, Th. Demma, M. Longo, S. Marano, V. Matta, V. Pierro, and
I. M. Pinto | How Many Templates for GW Chirp Detection? The Minimal-Match Issue
Revisited | submitted to Class. Quantum Grav. Typing error in eq. (4.8) fixed;
figure replaced in version 2 | Class.Quant.Grav. 21 (2004) 4955-4962 | 10.1088/0264-9381/21/21/013 | null | gr-qc | null | In a recent paper dealing with maximum likelihood detection of gravitational
wave chirps from coalescing binaries with unknown parameters we introduced an
accurate representation of the no-signal cumulative distribution of the
supremum of the whole correlator bank. This result can be used to derive a
refined estimate... | [
{
"created": "Wed, 21 Apr 2004 18:59:32 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Apr 2004 18:51:48 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Croce",
"R. P.",
""
],
[
"Demma",
"Th.",
""
],
[
"Longo",
"M.",
""
],
[
"Marano",
"S.",
""
],
[
"Matta",
"V.",
""
],
[
"Pierro",
"V.",
""
],
[
"Pinto",
"I. M.",
""
]
] | In a recent paper dealing with maximum likelihood detection of gravitational wave chirps from coalescing binaries with unknown parameters we introduced an accurate representation of the no-signal cumulative distribution of the supremum of the whole correlator bank. This result can be used to derive a refined estimate o... |
1409.2101 | Gary Osborn | Gary Osborn | A low order extension the Lienard-Wiechert retardation equations to
include the Thomas precession | Equation 21 was extended to the third derivative in this version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a calculation that directly parallels the derivation of the Thomas
precession, the first time derivative of the retarded potentials is derived.
The solutions have to be integrated in time to obtain the potential solution.
The Thomas precession vanishes when the acceleration and velocity vectors are
parallel, causi... | [
{
"created": "Sun, 7 Sep 2014 09:59:51 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Sep 2014 05:05:02 GMT",
"version": "v2"
}
] | 2014-09-19 | [
[
"Osborn",
"Gary",
""
]
] | In a calculation that directly parallels the derivation of the Thomas precession, the first time derivative of the retarded potentials is derived. The solutions have to be integrated in time to obtain the potential solution. The Thomas precession vanishes when the acceleration and velocity vectors are parallel, causing... |
1804.03003 | Yun Soo Myung | Yun Soo Myung, De-cheng Zou | Correlated stability conjecture for AdS black holes in higher
dimensional Ricci cubic gravity | 25 pages, 4 figures, version to appear in GRG | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the correlated stability conjecture for AdS black holes
obtained from the higher dimensional Ricci cubic gravity. It shows that the
Ricci tensor perturbations exhibit unstable modes for small AdS black holes
when solving Lichnerowicz equation, leading to Gregory-Laflamme instability. On
the other hand,... | [
{
"created": "Fri, 6 Apr 2018 04:59:10 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2023 22:54:45 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"Myung",
"Yun Soo",
""
],
[
"Zou",
"De-cheng",
""
]
] | We investigate the correlated stability conjecture for AdS black holes obtained from the higher dimensional Ricci cubic gravity. It shows that the Ricci tensor perturbations exhibit unstable modes for small AdS black holes when solving Lichnerowicz equation, leading to Gregory-Laflamme instability. On the other hand, w... |
gr-qc/9407006 | Christoph Schweigert | K. Peeters, C. Schweigert and J.W. van Holten | Extended Geometry of Black Holes | 9pp. (A4) LaTeX, epsf.sty, 1 figure, appended as a compressed and
uuencoded postscript file, NIKHEF-H/94-03 | Class.Quant.Grav.12:173-180,1995 | 10.1088/0264-9381/12/1/015 | null | gr-qc hep-th | null | We reconsider space-time singularities in classical Einsteinian general
relativity: with the help of several new co-ordinate systems we show that the
Schwarzschild solution can be extended beyond the curvature singularity at r=0.
The extension appears as an infinite covering of standard Kruskal space-time.
While the ... | [
{
"created": "Fri, 8 Jul 1994 10:54:27 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Peeters",
"K.",
""
],
[
"Schweigert",
"C.",
""
],
[
"van Holten",
"J. W.",
""
]
] | We reconsider space-time singularities in classical Einsteinian general relativity: with the help of several new co-ordinate systems we show that the Schwarzschild solution can be extended beyond the curvature singularity at r=0. The extension appears as an infinite covering of standard Kruskal space-time. While the tw... |
1002.2178 | Navin Sivanandam | Navin Sivanandam | A Computational Anthropic Principle: Where is the Hardest Problem in the
Multiverse? | 4th Place in FQXi essay contest: "What is Ultimately Possible in
Physics?" | null | null | UTTG-14-09 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anthropic principle is an inevitable constraint on the space of possible
theories. As such it is central to determining the limits of physics. In
particular, we contend that what is ultimately possible in physics is
determined by restrictions on the computational capacity of the universe, and
that observers are m... | [
{
"created": "Wed, 10 Feb 2010 19:06:58 GMT",
"version": "v1"
}
] | 2010-02-11 | [
[
"Sivanandam",
"Navin",
""
]
] | The anthropic principle is an inevitable constraint on the space of possible theories. As such it is central to determining the limits of physics. In particular, we contend that what is ultimately possible in physics is determined by restrictions on the computational capacity of the universe, and that observers are mor... |
gr-qc/0501061 | James M. Overduin | R. J. Adler and J. M. Overduin | The nearly flat universe | 14 pages, 5 figures | Gen.Rel.Grav.37:1491-1503,2005 | 10.1007/s10714-005-0189-6 | null | gr-qc | null | We study here what it means for the Universe to be nearly flat, as opposed to
exactly flat. We give three definitions of nearly flat, based on density,
geometry and dynamics; all three definitions are equivalent and depend on a
single constant flatness parameter epsilon that quantifies the notion of nearly
flat. Obse... | [
{
"created": "Thu, 20 Jan 2005 01:29:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Adler",
"R. J.",
""
],
[
"Overduin",
"J. M.",
""
]
] | We study here what it means for the Universe to be nearly flat, as opposed to exactly flat. We give three definitions of nearly flat, based on density, geometry and dynamics; all three definitions are equivalent and depend on a single constant flatness parameter epsilon that quantifies the notion of nearly flat. Observ... |
1311.4888 | Gabor Kunstatter | Gabor Kunstatter and Hideki Maeda | Throat quantization of the Schwarzschild-Tangherlini(-AdS) Black Hole | 39 pages, 3 figures, 2014 Class. Quantum Grav. 31 115009 | Class. Quant. Grav. 31 (2014) 115009 | 10.1088/0264-9381/31/11/115009 | RUP-13-15, CECS-PHY-13/09 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adopting the throat quantization pioneered by Louko and M\"akel\"a, we derive
the mass and area spectra for the Schwarzschild-Tangherlini black hole and its
anti-de~Sitter (AdS) generalization in arbitrary dimensions. We obtain exact
spectra in three special cases: the three-dimensional BTZ black hole, toroidal
black... | [
{
"created": "Tue, 19 Nov 2013 21:00:10 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Jun 2014 22:33:40 GMT",
"version": "v2"
}
] | 2017-06-13 | [
[
"Kunstatter",
"Gabor",
""
],
[
"Maeda",
"Hideki",
""
]
] | Adopting the throat quantization pioneered by Louko and M\"akel\"a, we derive the mass and area spectra for the Schwarzschild-Tangherlini black hole and its anti-de~Sitter (AdS) generalization in arbitrary dimensions. We obtain exact spectra in three special cases: the three-dimensional BTZ black hole, toroidal black h... |
1004.2572 | Ozay Gurtug | O. Unver and O. Gurtug | Quantum singularities in (2+1) dimensional matter coupled black hole
spacetimes | 13 pages, 1 figure. Final version, to appear in PRD | Phys.Rev.D82:084016,2010 | 10.1103/PhysRevD.82.084016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum singularities considered in the 3D BTZ spacetime by Pitelli and
Letelier (Phys. Rev. D77: 124030, 2008) is extended to charged BTZ and 3D
Einstein-Maxwell-dilaton gravity spacetimes. The occurence of naked
singularities in the Einstein-Maxwell extension of the BTZ spacetime both in
linear and non-linear elect... | [
{
"created": "Thu, 15 Apr 2010 08:02:49 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 2010 08:01:01 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Sep 2010 12:52:10 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Unver",
"O.",
""
],
[
"Gurtug",
"O.",
""
]
] | Quantum singularities considered in the 3D BTZ spacetime by Pitelli and Letelier (Phys. Rev. D77: 124030, 2008) is extended to charged BTZ and 3D Einstein-Maxwell-dilaton gravity spacetimes. The occurence of naked singularities in the Einstein-Maxwell extension of the BTZ spacetime both in linear and non-linear electro... |
2407.12732 | Sergey Yu. Vernov | Vsevolod R. Ivanov and Sergey Yu. Vernov | New Integrable Chiral Cosmological Models with Two Scalar Fields | 18 pages | null | null | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct integrable chiral cosmological models with two scalar fields and
potentials represented in terms of hyperbolic functions. Using the conformal
transformation of the metric and the corresponding models with induced gravity
terms, we obtain the general solutions in the spatially flat, open and closed
Friedm... | [
{
"created": "Wed, 17 Jul 2024 16:51:10 GMT",
"version": "v1"
}
] | 2024-07-18 | [
[
"Ivanov",
"Vsevolod R.",
""
],
[
"Vernov",
"Sergey Yu.",
""
]
] | We construct integrable chiral cosmological models with two scalar fields and potentials represented in terms of hyperbolic functions. Using the conformal transformation of the metric and the corresponding models with induced gravity terms, we obtain the general solutions in the spatially flat, open and closed Friedman... |
1904.05084 | Juho Lankinen | Juho Lankinen, Joonas Malmi, Iiro Vilja | Fermionic decay of a massive scalar in the early Universe | 9 pages, 2 figures. Corrected some minor misprints | null | 10.1140/epjc/s10052-020-8074-8 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a curved space generalization of a scalar to fermion decay rate
with a Yukawa coupling in expanding Friedmann-Robertson-Walker universes. This
is done using the full theory of quantum fields in curved spacetime and the
added-up transition probability method. It is found that in an expanding
universe the usu... | [
{
"created": "Wed, 10 Apr 2019 09:29:43 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2019 09:34:57 GMT",
"version": "v2"
}
] | 2020-06-09 | [
[
"Lankinen",
"Juho",
""
],
[
"Malmi",
"Joonas",
""
],
[
"Vilja",
"Iiro",
""
]
] | We derive a curved space generalization of a scalar to fermion decay rate with a Yukawa coupling in expanding Friedmann-Robertson-Walker universes. This is done using the full theory of quantum fields in curved spacetime and the added-up transition probability method. It is found that in an expanding universe the usual... |
2308.01615 | Nigel Bishop | Vishnu Kakkat and Nigel T. Bishop and Amos S. Kubeka | Gravitational Wave Heating | null | Physical Review D, 109, 024013 (2024) | 10.1103/PhysRevD.109.024013 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | It was shown in previous work that when a gravitational wave (GW) passes
through a viscous shell of matter the magnitude of the GW will be damped and
there are astrohysical circumstances in which the damping is almost complete.
The energy transfer from the GWs to the fluid will increase its temperature. We
construct ... | [
{
"created": "Thu, 3 Aug 2023 08:42:48 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jan 2024 13:24:28 GMT",
"version": "v2"
}
] | 2024-01-12 | [
[
"Kakkat",
"Vishnu",
""
],
[
"Bishop",
"Nigel T.",
""
],
[
"Kubeka",
"Amos S.",
""
]
] | It was shown in previous work that when a gravitational wave (GW) passes through a viscous shell of matter the magnitude of the GW will be damped and there are astrohysical circumstances in which the damping is almost complete. The energy transfer from the GWs to the fluid will increase its temperature. We construct a ... |
gr-qc/0302011 | Izzet Sakalli | M.Halilsoy and I.Sakalli | Scalar Field Solutions in Colliding Einstein-Maxwell Waves | Letter/5 pages | null | null | null | gr-qc | null | A simple method is presented which enables us to construct scalar field
solutions from any given Einstein-Maxwell solution in colliding plane waves. As
an application we give scalar field extensions of the solution found by Hogan,
Barrabes and Bressange.
| [
{
"created": "Tue, 4 Feb 2003 10:41:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Halilsoy",
"M.",
""
],
[
"Sakalli",
"I.",
""
]
] | A simple method is presented which enables us to construct scalar field solutions from any given Einstein-Maxwell solution in colliding plane waves. As an application we give scalar field extensions of the solution found by Hogan, Barrabes and Bressange. |
1110.2775 | Jos\'e Antonio Belinch\'on | Jos\'e Antonio Belinch\'on | (An)Isotropic models in scalar and scalar-tensor cosmologies | null | Astrophys Space Sci (2012) 338:381-400 | 10.1007/s10509-011-0954-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how the constants $G$ and $\Lambda$ may vary in different
theoretical models (general relativity with a perfect fluid, scalar
cosmological models (\textquotedblleft quintessence\textquotedblright) with and
without interacting scalar and matter fields and a scalar-tensor model with a
dynamical $\Lambda$) in o... | [
{
"created": "Wed, 12 Oct 2011 15:22:26 GMT",
"version": "v1"
}
] | 2012-04-06 | [
[
"Belinchón",
"José Antonio",
""
]
] | We study how the constants $G$ and $\Lambda$ may vary in different theoretical models (general relativity with a perfect fluid, scalar cosmological models (\textquotedblleft quintessence\textquotedblright) with and without interacting scalar and matter fields and a scalar-tensor model with a dynamical $\Lambda$) in ord... |
2212.05822 | Nobuyoshi Komatsu | Nobuyoshi Komatsu | Horizon thermodynamics and cosmological equations: A holographic-like
connection between thermostatistical quantities on a cosmological horizon and
in the bulk | Final version accepted for publication in EPJC. Several paragraphs
and references are added. [10 pages] | Eur. Phys. J. C 83, 690 (2023) | 10.1140/epjc/s10052-023-11855-7 | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Horizon thermodynamics is expected to be related to the effective energy
based on the energy density calculated from the Friedmann equation for a
Friedmann--Robertson--Walker (FRW) universe. In the present study, the
effective energy and thermostatistical quantities on a cosmological horizon are
examined to clarify t... | [
{
"created": "Mon, 12 Dec 2022 10:42:10 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jul 2023 23:26:38 GMT",
"version": "v2"
}
] | 2023-08-07 | [
[
"Komatsu",
"Nobuyoshi",
""
]
] | Horizon thermodynamics is expected to be related to the effective energy based on the energy density calculated from the Friedmann equation for a Friedmann--Robertson--Walker (FRW) universe. In the present study, the effective energy and thermostatistical quantities on a cosmological horizon are examined to clarify the... |
gr-qc/9711064 | Marcelo Jose Reboucas | J.E. Aman, J.B. Fonseca-Neto, M.A.H. MacCallum and M.J. Reboucas | Riemann-Cartan Space-times of G\"odel Type | 24 pages, LaTeX file | Class.Quant.Grav.15:1089-1101,1998 | 10.1088/0264-9381/15/4/026 | CBPF-NF-047/97 | gr-qc astro-ph | null | A class of Riemann-Cartan G\"odel-type space-times are examined in the light
of the equivalence problem techniques. The conditions for local space-time
homogeneity are derived, generalizing previous works on Riemannian G\"odel-type
space-times. The equivalence of Riemann-Cartan G\"odel-type space-times of this
class ... | [
{
"created": "Thu, 20 Nov 1997 20:51:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Aman",
"J. E.",
""
],
[
"Fonseca-Neto",
"J. B.",
""
],
[
"MacCallum",
"M. A. H.",
""
],
[
"Reboucas",
"M. J.",
""
]
] | A class of Riemann-Cartan G\"odel-type space-times are examined in the light of the equivalence problem techniques. The conditions for local space-time homogeneity are derived, generalizing previous works on Riemannian G\"odel-type space-times. The equivalence of Riemann-Cartan G\"odel-type space-times of this class is... |
1610.02810 | Andrew Finch | Andrew Finch and Jackson Levi Said | Gravitomagnetic effects in quadratic gravity with a scalar field | 7 pages | Phys. Rev. D 94, 084010 (2016) | 10.1103/PhysRevD.94.084010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two gravitomagnetic effects which influence bodies orbiting around a
gravitational source are the geodetic effect and the Lense-Thirring effect. The
former describes the precession angle of the axis of a spinning gyroscope while
in orbit around a nonrotating gravitational source whereas the latter provides
a corr... | [
{
"created": "Mon, 10 Oct 2016 08:59:37 GMT",
"version": "v1"
}
] | 2016-10-11 | [
[
"Finch",
"Andrew",
""
],
[
"Said",
"Jackson Levi",
""
]
] | The two gravitomagnetic effects which influence bodies orbiting around a gravitational source are the geodetic effect and the Lense-Thirring effect. The former describes the precession angle of the axis of a spinning gyroscope while in orbit around a nonrotating gravitational source whereas the latter provides a correc... |
1609.01632 | Simone Speziale | Simone Speziale | Boosting Wigner's nj-symbols | 35 pages, many figures. v2: many improvements, in particular
clarifications on different options for the phases of the CG coefficients | null | 10.1063/1.4977752 | null | gr-qc hep-th math-ph math.GR math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the SL(2,C) Clebsch-Gordan coefficients appearing in the lorentzian
EPRL spin foam amplitudes for loop quantum gravity. We show how the amplitudes
decompose into SU(2) nj-symbols at the vertices and integrals over boosts at
the edges. The integrals define edge amplitudes that can be evaluated
analytically us... | [
{
"created": "Tue, 6 Sep 2016 16:06:49 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2016 11:10:42 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Speziale",
"Simone",
""
]
] | We study the SL(2,C) Clebsch-Gordan coefficients appearing in the lorentzian EPRL spin foam amplitudes for loop quantum gravity. We show how the amplitudes decompose into SU(2) nj-symbols at the vertices and integrals over boosts at the edges. The integrals define edge amplitudes that can be evaluated analytically usin... |
1708.07001 | Justin Feng | Justin C. Feng, Richard A. Matzner | From path integrals to the Wheeler-DeWitt equation: Time evolution in
spacetimes with a spatial boundary | Revised to match published version in Phys. Rev. D | Phys. Rev. D 96, 106005 (2017) | 10.1103/PhysRevD.96.106005 | UTTG-08-17 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine the relationship between the path integral and canonical
formulation of quantum general relativity. In particular, we present a formal
derivation of the Wheeler-DeWitt equation from the path integral for quantum
general relativity by way of boundary variations. One feature of this approach
is that it doe... | [
{
"created": "Mon, 21 Aug 2017 20:48:31 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2017 20:06:37 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Oct 2017 15:54:44 GMT",
"version": "v3"
},
{
"created": "Mon, 13 Nov 2017 02:09:36 GMT",
"version": "v4"
}
] | 2017-11-15 | [
[
"Feng",
"Justin C.",
""
],
[
"Matzner",
"Richard A.",
""
]
] | We reexamine the relationship between the path integral and canonical formulation of quantum general relativity. In particular, we present a formal derivation of the Wheeler-DeWitt equation from the path integral for quantum general relativity by way of boundary variations. One feature of this approach is that it does ... |
2003.10127 | Shantanu Desai | Aditi Krishak, Shantanu Desai | Model Comparison tests of modified gravity from the E\"ot-Wash
experiment | 13 pages, 1 figure. Link to analysis code available at
https://github.com/aditikrishak/EotWash_analysis | JCAP 07 (2020) 006 | 10.1088/1475-7516/2020/07/006 | null | gr-qc astro-ph.CO astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Perivolaropoulos et al (arXiv:1904.09462) (P19) have argued that the residual
torque data in the E\"ot-Wash experiment is consistent with an oscillating
signal. This could either be a signature of non-local modified gravity theories
or some other systematic error in the data. We independently assess the
viability of ... | [
{
"created": "Mon, 23 Mar 2020 08:25:06 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2020 13:06:35 GMT",
"version": "v2"
},
{
"created": "Sun, 7 Jun 2020 15:09:50 GMT",
"version": "v3"
}
] | 2020-07-03 | [
[
"Krishak",
"Aditi",
""
],
[
"Desai",
"Shantanu",
""
]
] | Perivolaropoulos et al (arXiv:1904.09462) (P19) have argued that the residual torque data in the E\"ot-Wash experiment is consistent with an oscillating signal. This could either be a signature of non-local modified gravity theories or some other systematic error in the data. We independently assess the viability of su... |
1305.6712 | Jia-An Lu | Jia-An Lu, Chao-Guang Huang | Weak field approximation in a model of de Sitter gravity:
Schwarzschild-de Sitter solutions | 15 pages. arXiv admin note: text overlap with arXiv:1301.5796 | Int. J. Mod. Phys. D 2013 22 (7) 1350048 | 10.1142/S021827181350048X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The weak field approximation in a model of de Sitter gravity is investigated
in the static and spherically symmetric case, under the assumption that the
vacuum spacetime without perturbations from matter fields is a torsion-free de
Sitter spacetime. It is shown on one hand that any solution should be singular
at the ... | [
{
"created": "Wed, 29 May 2013 07:55:26 GMT",
"version": "v1"
}
] | 2013-06-12 | [
[
"Lu",
"Jia-An",
""
],
[
"Huang",
"Chao-Guang",
""
]
] | The weak field approximation in a model of de Sitter gravity is investigated in the static and spherically symmetric case, under the assumption that the vacuum spacetime without perturbations from matter fields is a torsion-free de Sitter spacetime. It is shown on one hand that any solution should be singular at the ce... |
gr-qc/9709055 | Takashi Tamaki | Takashi Tamaki, Takashi Torii and Kei-ichi Maeda | Non-Abelian Black Holes in Brans-Dicke Theory | 31 pages, revtex, 21 figures | Phys.Rev.D57:4870-4884,1998 | 10.1103/PhysRevD.57.4870 | WU-AP/66/97 | gr-qc hep-th | null | We find a black hole solution with non-Abelian field in Brans-Dicke theory.
It is an extension of non-Abelian black hole in general relativity. We discuss
two non-Abelian fields: "SU(2)" Yang-Mills field with a mass (Proca field) and
the SU(2)$\times$SU(2) Skyrme field. In both cases, as in general relativity,
there ... | [
{
"created": "Mon, 22 Sep 1997 08:08:13 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Tamaki",
"Takashi",
""
],
[
"Torii",
"Takashi",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We find a black hole solution with non-Abelian field in Brans-Dicke theory. It is an extension of non-Abelian black hole in general relativity. We discuss two non-Abelian fields: "SU(2)" Yang-Mills field with a mass (Proca field) and the SU(2)$\times$SU(2) Skyrme field. In both cases, as in general relativity, there ar... |
1006.1762 | Kensuke Homma | Yasunori Fujii and Kensuke Homma | An approach toward the laboratory search for the scalar field as a
candidate of Dark Energy | 20 pages, 6 figure. Accepted by Progress of Theoretical Physics | Prog. Theor. Phys. 126 (2011), 531-553 | 10.1143/PTP.126.531 | null | gr-qc hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed accelerating universe indicates the presence of Dark Energy
which is probably interpreted in terms of an extremely light gravitational
scalar field. We suggest a way to probe this scalar field which contributes to
optical light-by-light scattering through the resonance in the quasi-parallel
collision geo... | [
{
"created": "Wed, 9 Jun 2010 10:36:32 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2011 16:39:12 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Aug 2011 21:46:56 GMT",
"version": "v3"
}
] | 2011-11-03 | [
[
"Fujii",
"Yasunori",
""
],
[
"Homma",
"Kensuke",
""
]
] | The observed accelerating universe indicates the presence of Dark Energy which is probably interpreted in terms of an extremely light gravitational scalar field. We suggest a way to probe this scalar field which contributes to optical light-by-light scattering through the resonance in the quasi-parallel collision geome... |
gr-qc/0012076 | Hod Shahar | Shahar Hod | Discrete Black-Hole Radiation and the Information Loss Paradox | 12 pages | Phys.Lett. A299 (2002) 144-148 | 10.1016/S0375-9601(02)00013-0 | null | gr-qc hep-th quant-ph | null | Hawking's black hole information puzzle highlights the incompatibility
between our present understanding of gravity and quantum physics. However,
Hawking's prediction of black-hole evaporation is at a semiclassical level. One
therefore suspects some modifications of the character of the radiation when
quantum propert... | [
{
"created": "Wed, 20 Dec 2000 08:52:55 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jun 2002 08:07:50 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jun 2002 08:04:21 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Hod",
"Shahar",
""
]
] | Hawking's black hole information puzzle highlights the incompatibility between our present understanding of gravity and quantum physics. However, Hawking's prediction of black-hole evaporation is at a semiclassical level. One therefore suspects some modifications of the character of the radiation when quantum propertie... |
1006.2226 | Ujjal Debnath | Surajit Chattopadhyay and Ujjal Debnath | Interaction between DBI-essence and other Dark Energies | 13 pages, 18 figures | Int.J.Theor.Phys.49:1465-1480,2010 | 10.1007/s10773-010-0328-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work considers interaction between DBI-essence and other
candidates of dark energies like modified Chaplygin gas, hessence, tachyonic
field, and new agegraphic dark energy. The potentials of the fields have been
reconstructed under interaction and their evolutions have been viewed against
cosmic time $t$ ... | [
{
"created": "Fri, 11 Jun 2010 08:15:04 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Chattopadhyay",
"Surajit",
""
],
[
"Debnath",
"Ujjal",
""
]
] | The present work considers interaction between DBI-essence and other candidates of dark energies like modified Chaplygin gas, hessence, tachyonic field, and new agegraphic dark energy. The potentials of the fields have been reconstructed under interaction and their evolutions have been viewed against cosmic time $t$ an... |
0903.3505 | Peter Breitenlohner | Peter Breitenlohner and D. H. Tchrakian | Gravitating BPS Monopoles in all d=4p Spacetime Dimensions | 31 pages, 9 figures | Class.Quant.Grav.26:145008,2009 | 10.1088/0264-9381/26/14/145008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have constructed, numerically, both regular and black hole static
solutions to the simplest possible gravitating Yang-Mills--Higgs (YMH) in $4p$
spacetime dimensions. The YMH systems consist of $2p-$th power curvature fields
without a Higgs potential. The gravitational systems consist of the `Ricci
scalar' of the ... | [
{
"created": "Fri, 20 Mar 2009 12:46:27 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Breitenlohner",
"Peter",
""
],
[
"Tchrakian",
"D. H.",
""
]
] | We have constructed, numerically, both regular and black hole static solutions to the simplest possible gravitating Yang-Mills--Higgs (YMH) in $4p$ spacetime dimensions. The YMH systems consist of $2p-$th power curvature fields without a Higgs potential. The gravitational systems consist of the `Ricci scalar' of the $p... |
1309.0544 | Tanja Hinderer | Tanja Hinderer, Alessandra Buonanno, Abdul H. Mrou\'e, Daniel A.
Hemberger, Geoffrey Lovelace, Harald P. Pfeiffer, Lawrence E. Kidder, Mark A.
Scheel, Bela Szilagyi, Nicholas W. Taylor, and Saul A. Teukolsky | Periastron advance in spinning black hole binaries: comparing
effective-one-body and Numerical Relativity | minor changes to match published version | null | 10.1103/PhysRevD.88.084005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the periastron advance using the effective-one-body formalism for
binary black holes moving on quasi-circular orbits and having spins collinear
with the orbital angular momentum. We compare the predictions with the
periastron advance recently computed in accurate numerical-relativity
simulations and find r... | [
{
"created": "Mon, 2 Sep 2013 21:03:17 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 2013 21:27:14 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Nov 2013 21:14:44 GMT",
"version": "v3"
}
] | 2015-06-17 | [
[
"Hinderer",
"Tanja",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Mroué",
"Abdul H.",
""
],
[
"Hemberger",
"Daniel A.",
""
],
[
"Lovelace",
"Geoffrey",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
"Kidder",
"Lawrence... | We compute the periastron advance using the effective-one-body formalism for binary black holes moving on quasi-circular orbits and having spins collinear with the orbital angular momentum. We compare the predictions with the periastron advance recently computed in accurate numerical-relativity simulations and find rem... |
0710.5572 | Christian Schubert | F. Bastianelli, U. Nucamendi, C. Schubert, V.M. Villanueva | One loop photon-graviton mixing in an electromagnetic field: Part 2 | 31 pages, 3 figures | JHEP0711:099,2007 | 10.1088/1126-6708/2007/11/099 | AEI-2005-137 | gr-qc hep-th | null | In part 1 of this series compact integral representations had been obtained
for the one-loop photon-graviton amplitude involving a charged spin 0 or spin
1/2 particle in the loop and an arbitrary constant electromagnetic field. In
this sequel, we study the structure and magnitude of the various polarization
component... | [
{
"created": "Tue, 30 Oct 2007 05:19:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bastianelli",
"F.",
""
],
[
"Nucamendi",
"U.",
""
],
[
"Schubert",
"C.",
""
],
[
"Villanueva",
"V. M.",
""
]
] | In part 1 of this series compact integral representations had been obtained for the one-loop photon-graviton amplitude involving a charged spin 0 or spin 1/2 particle in the loop and an arbitrary constant electromagnetic field. In this sequel, we study the structure and magnitude of the various polarization components ... |
1107.6023 | Michael Koehn | Michael Koehn | Relativistic Wavepackets in Classically Chaotic Quantum Cosmological
Billiards | 18 pages, 10 figures | Phys Rev D 85, 063501 (2012) | 10.1103/PhysRevD.85.063501 | AEI-2011-050 | gr-qc hep-th nlin.CD quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Close to a spacelike singularity, pure gravity and supergravity in four to
eleven spacetime dimensions admit a cosmological billiard description based on
hyperbolic Kac-Moody groups. We investigate the quantum cosmological billiards
of relativistic wavepackets towards the singularity, employing flat and
hyperbolic sp... | [
{
"created": "Fri, 29 Jul 2011 17:06:23 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Mar 2012 16:53:04 GMT",
"version": "v2"
}
] | 2012-03-05 | [
[
"Koehn",
"Michael",
""
]
] | Close to a spacelike singularity, pure gravity and supergravity in four to eleven spacetime dimensions admit a cosmological billiard description based on hyperbolic Kac-Moody groups. We investigate the quantum cosmological billiards of relativistic wavepackets towards the singularity, employing flat and hyperbolic spac... |
2008.00649 | Eric De Giuli | Eric De Giuli and A. Zee | Glassy gravity | 5 pages + 4 pages SI | null | 10.1209/0295-5075/133/20008 | null | gr-qc cond-mat.dis-nn hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Euclidean quantum gravity is reconsidered, in the conformal mode
approximation. Applying techniques from glass theory, we argue that the
Euclidean partition function hides metastable states, which can be counted.
This may reconcile conflicting results on the uniqueness of the de Sitter
vacuum, and may be relevant to ... | [
{
"created": "Mon, 3 Aug 2020 05:16:46 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jan 2021 16:31:09 GMT",
"version": "v2"
}
] | 2021-05-26 | [
[
"De Giuli",
"Eric",
""
],
[
"Zee",
"A.",
""
]
] | Euclidean quantum gravity is reconsidered, in the conformal mode approximation. Applying techniques from glass theory, we argue that the Euclidean partition function hides metastable states, which can be counted. This may reconcile conflicting results on the uniqueness of the de Sitter vacuum, and may be relevant to th... |
gr-qc/0010038 | Sergey S. Kokarev | Sergey Kokarev | Space-time as strongly bent plate | 20 pages, LaTEX 2e | Nuovo Cim.B114:903-921,1999 | null | null | gr-qc | null | Futher development is made of a consept of space-time as multidimensional
elastic plate, proposed earlier in [20,21]. General equilibrium equations,
including 4-dimensional tangent stress tensor - energy-momentum tensor of
matter - are derived. Comparative analysis of multidimensional elasticity
theory (MET) and GR i... | [
{
"created": "Tue, 10 Oct 2000 14:30:11 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kokarev",
"Sergey",
""
]
] | Futher development is made of a consept of space-time as multidimensional elastic plate, proposed earlier in [20,21]. General equilibrium equations, including 4-dimensional tangent stress tensor - energy-momentum tensor of matter - are derived. Comparative analysis of multidimensional elasticity theory (MET) and GR is ... |
gr-qc/0306084 | Pieter Kok | Pieter Kok and Ulvi Yurtsever | Gravitational decoherence | 13 pages, 4 figures REVTeX | Phys.Rev. D68 (2003) 085006 | 10.1103/PhysRevD.68.085006 | null | gr-qc quant-ph | null | We investigate the effect of quantum metric fluctuations on qubits that are
gravitationally coupled to a background spacetime. In our first example, we
study the propagation of a qubit in flat spacetime whose metric is subject to
flat quantum fluctuations with a Gaussian spectrum. We find that these
fluctuations caus... | [
{
"created": "Wed, 18 Jun 2003 15:51:46 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kok",
"Pieter",
""
],
[
"Yurtsever",
"Ulvi",
""
]
] | We investigate the effect of quantum metric fluctuations on qubits that are gravitationally coupled to a background spacetime. In our first example, we study the propagation of a qubit in flat spacetime whose metric is subject to flat quantum fluctuations with a Gaussian spectrum. We find that these fluctuations cause ... |
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