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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1812.06841 | Jorma Louko | Anshuman Bhardwaj, Edmund J. Copeland and Jorma Louko | Inflation in Loop Quantum Cosmology | 18 pages, 6 tables. v2: updates to match published version | Phys. Rev. D 99, 063520 (2019) | 10.1103/PhysRevD.99.063520 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a consistent analytic approach to determine the conditions under
which slow roll inflation can arise when the inflaton is the same scalar field
that is responsible for the bounce in Loop Quantum Cosmology (LQC). We find
that the requirement that the energy density of the field is fixed at the
bounce having... | [
{
"created": "Mon, 17 Dec 2018 15:35:33 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Nov 2019 12:48:06 GMT",
"version": "v2"
}
] | 2019-11-04 | [
[
"Bhardwaj",
"Anshuman",
""
],
[
"Copeland",
"Edmund J.",
""
],
[
"Louko",
"Jorma",
""
]
] | We develop a consistent analytic approach to determine the conditions under which slow roll inflation can arise when the inflaton is the same scalar field that is responsible for the bounce in Loop Quantum Cosmology (LQC). We find that the requirement that the energy density of the field is fixed at the bounce having t... |
2111.11199 | Aneta Wojnar | Aleksander Kozak and Aneta Wojnar | Interiors of terrestrial planets in metric-affine gravity | 8 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a semi-empirical approach we show that modified gravity affects the
internal properties of terrestrial planets, such as their physical
characteristics of a core, mantle, and core-mantle boundary. We also apply
these findings for modeling a two-layers exoplanet in Palatini $f(R)$ gravity.
| [
{
"created": "Mon, 22 Nov 2021 13:43:40 GMT",
"version": "v1"
}
] | 2021-11-23 | [
[
"Kozak",
"Aleksander",
""
],
[
"Wojnar",
"Aneta",
""
]
] | Using a semi-empirical approach we show that modified gravity affects the internal properties of terrestrial planets, such as their physical characteristics of a core, mantle, and core-mantle boundary. We also apply these findings for modeling a two-layers exoplanet in Palatini $f(R)$ gravity. |
2209.07555 | Yolbeiker Rodr\'iguez Baez | Yolbeiker Rodr\'iguez Baez and Manuel Gonzalez-Espinoza | Odd-parity perturbations in the most general scalar-vector-tensor theory | 22 pages, Mathematica Notebook, Added some comments, Published in
Classical and Quantum Gravity | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In the context of the most general scalar-vector-tensor theory, we study the
stability of static spherically symmetric black holes under linear odd-parity
perturbations. We calculate the action to second order in the linear
perturbations to derive a master equation for these perturbations. For this
general class of m... | [
{
"created": "Thu, 15 Sep 2022 18:30:22 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2023 18:05:06 GMT",
"version": "v2"
}
] | 2023-04-06 | [
[
"Baez",
"Yolbeiker Rodríguez",
""
],
[
"Gonzalez-Espinoza",
"Manuel",
""
]
] | In the context of the most general scalar-vector-tensor theory, we study the stability of static spherically symmetric black holes under linear odd-parity perturbations. We calculate the action to second order in the linear perturbations to derive a master equation for these perturbations. For this general class of mod... |
0708.4218 | Christian Fr{\o}nsdal | Christian Fronsdal | Reissner-Nordstrom and charged gas spheres | 19 pages, plain tex | Lett.Math.Phys.82:255-273,2007 | 10.1007/s11005-007-0203-x | null | gr-qc | null | The main point of this paper is a suggestion about the proper treatment of
the photon gas in a theory of stellar structure and other plasmas. This problem
arises in the study of polytropic gas spheres, where we have already introduced
some innovations. The main idea, already advanced in the contextof neutral,
homogen... | [
{
"created": "Thu, 30 Aug 2007 19:29:33 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fronsdal",
"Christian",
""
]
] | The main point of this paper is a suggestion about the proper treatment of the photon gas in a theory of stellar structure and other plasmas. This problem arises in the study of polytropic gas spheres, where we have already introduced some innovations. The main idea, already advanced in the contextof neutral, homogeneo... |
1901.01315 | Pablo Antonio Cano Molina-Ni\~nirola | Pablo A. Cano and Alejandro Ruip\'erez | Leading higher-derivative corrections to Kerr geometry | v3: The equations 4.41-4.43 for the lightring frequencies have been
amended. These formulas were incorrect in the previous versions due to an
error when translating the results to the LaTeX file (the error does not
propagate to other results). For all the rest, this version matches the one
published in JHEP | null | 10.1007/JHEP05(2019)189 | IFT-UAM/CSIC-19-2 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the most general leading-order correction to Kerr solution when
the Einstein-Hilbert action is supplemented with higher-derivative terms,
including the possibility of dynamical couplings controlled by scalars. The
model we present depends on five parameters and it contains, as particular
cases, Einstein-di... | [
{
"created": "Fri, 4 Jan 2019 21:12:12 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2019 13:21:25 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Mar 2020 12:59:09 GMT",
"version": "v3"
}
] | 2020-03-06 | [
[
"Cano",
"Pablo A.",
""
],
[
"Ruipérez",
"Alejandro",
""
]
] | We compute the most general leading-order correction to Kerr solution when the Einstein-Hilbert action is supplemented with higher-derivative terms, including the possibility of dynamical couplings controlled by scalars. The model we present depends on five parameters and it contains, as particular cases, Einstein-dila... |
1501.02342 | Wolfgang Muschik | Wolfgang Muschik, Horst-Heino v. Borzeszkowski | Exploitation of the Dissipation Inequality in General Relativistic
Continuum Thermodynamics | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The balance equations of energy-momentum and spin together with Einstein's
field equations are investigated by the Liu procedure to find constraints for
the constitutive equations in such a way that the Second Law is satisfied.
Special cases such as spinless systems and curvature insensitive materials are
shortly dis... | [
{
"created": "Sat, 10 Jan 2015 12:08:50 GMT",
"version": "v1"
}
] | 2015-01-13 | [
[
"Muschik",
"Wolfgang",
""
],
[
"Borzeszkowski",
"Horst-Heino v.",
""
]
] | The balance equations of energy-momentum and spin together with Einstein's field equations are investigated by the Liu procedure to find constraints for the constitutive equations in such a way that the Second Law is satisfied. Special cases such as spinless systems and curvature insensitive materials are shortly discu... |
1509.04577 | Francisco Lobo | Marzieh Peyravi, Nematollah Riazi, Francisco S.N. Lobo | Thick brane solitons breaking $Z_2$ symmetry | 6 pages, 3 figures; contribution to the proceedings of the "The
Fourtheenth Marcel Grossmann Meeting on General Relativity", University of
Rome "La Sapienza", Rome, July 12-18, 2015, based on a talk delivered at the
AT2-Alternative Theories parallel session | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New soliton solutions for thick branes in 4 + 1 dimensions are considered in
this article. In particular, brane models based on the sine-Gordon (SG),
$\varphi^{4}$ and $\varphi^{6}$ scalar fields are investigated; in some cases
$Z_{2}$ symmetry is broken. Besides, these soliton solutions are responsible
for supportin... | [
{
"created": "Tue, 15 Sep 2015 14:23:57 GMT",
"version": "v1"
}
] | 2015-09-16 | [
[
"Peyravi",
"Marzieh",
""
],
[
"Riazi",
"Nematollah",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | New soliton solutions for thick branes in 4 + 1 dimensions are considered in this article. In particular, brane models based on the sine-Gordon (SG), $\varphi^{4}$ and $\varphi^{6}$ scalar fields are investigated; in some cases $Z_{2}$ symmetry is broken. Besides, these soliton solutions are responsible for supporting ... |
gr-qc/0301079 | Jose Wadih Maluf | A. A. Sousa and J. W. Maluf | Black Holes in 2+1 Teleparallel Theories of Gravity | 20 pages, Latex file, no figures | Prog.Theor.Phys. 108 (2002) 457-470 | 10.1143/PTP.108.457 | Prog. Theor. Phys. Vol. 108, 457-470 (2002) | gr-qc | null | We apply the Hamiltonian formulation of teleparallel theories of gravity in
2+1 dimensions to a circularly symmetric geometry. We find a family of
one-parameter black hole solutions. The BTZ solution fixes the unique free
parameter of the theory. The resulting field equations coincide with the
teleparallel equivalent... | [
{
"created": "Tue, 21 Jan 2003 16:59:41 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sousa",
"A. A.",
""
],
[
"Maluf",
"J. W.",
""
]
] | We apply the Hamiltonian formulation of teleparallel theories of gravity in 2+1 dimensions to a circularly symmetric geometry. We find a family of one-parameter black hole solutions. The BTZ solution fixes the unique free parameter of the theory. The resulting field equations coincide with the teleparallel equivalent o... |
gr-qc/9508007 | Per Kraus | Per Kraus | Non-thermal aspects of black hole radiance | Princeton University thesis; 101 pages; compressed latex; 4 figures | null | null | null | gr-qc | null | The phenomenon of black hole thermodynamics raises several deep issues which
any proper theory of quantum gravity must confront: to what extent does the
inclusion of the back-reaction alter the thermal character of the radiation,
how can the entropy be understood from a microscopic standpoint, what is the
ultimate fa... | [
{
"created": "Fri, 4 Aug 1995 02:04:31 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Kraus",
"Per",
""
]
] | The phenomenon of black hole thermodynamics raises several deep issues which any proper theory of quantum gravity must confront: to what extent does the inclusion of the back-reaction alter the thermal character of the radiation, how can the entropy be understood from a microscopic standpoint, what is the ultimate fate... |
1111.5090 | Ryotaro Kase | Antonio De Felice, Ryotaro Kase, Shinji Tsujikawa | Vainshtein mechanism in second-order scalar-tensor theories | 15 pages, no figures | Phys.Rev.D85:044059, 2012 | 10.1103/PhysRevD.85.044059 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In second-order scalar-tensor theories we study how the Vainshtein mechanism
works in a spherically symmetric background with a matter source. In the
presence of the field coupling $F(\phi)=e^{-2Q\phi}$ with the Ricci scalar $R$
we generally derive the Vainshtein radius within which the General Relativistic
behavior ... | [
{
"created": "Tue, 22 Nov 2011 04:58:43 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Feb 2012 12:56:45 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"De Felice",
"Antonio",
""
],
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | In second-order scalar-tensor theories we study how the Vainshtein mechanism works in a spherically symmetric background with a matter source. In the presence of the field coupling $F(\phi)=e^{-2Q\phi}$ with the Ricci scalar $R$ we generally derive the Vainshtein radius within which the General Relativistic behavior is... |
1311.5808 | Matteo Luca Ruggiero | Matteo Luca Ruggiero | Using Ring Laser Systems to Measure Gravitomagnetic Effects on Earth | 3 pages, in "QSO astrophysics, fundamental physics, and astrometric
cosmology in the Gaia era" Porto-Portugal, June 6-9, 2011, Editors: S. Anton,
M. Crosta, M.G. Lattanzi and A. Andrei. Memorie della Societ\`a Astronomica
Italiana, Vol. 83 (2012) | Memorie della Societ\`a Astronomica Italiana, Vol. 83 (2012),
Pages 1017-1019 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitomagnetic effects originates from the rotation of the source of the
gravitational field and from the rotational features of the observers' frame.
In recent years, gravitomagnetism has been tested by means of its impact on the
precession of LAGEOS orbits and on the precession of spherical gyroscopes in
the GP-B ... | [
{
"created": "Fri, 22 Nov 2013 16:45:28 GMT",
"version": "v1"
}
] | 2013-12-06 | [
[
"Ruggiero",
"Matteo Luca",
""
]
] | Gravitomagnetic effects originates from the rotation of the source of the gravitational field and from the rotational features of the observers' frame. In recent years, gravitomagnetism has been tested by means of its impact on the precession of LAGEOS orbits and on the precession of spherical gyroscopes in the GP-B ex... |
1109.4239 | Aurelien Barrau | Aurelien Barrau, Xiangyu Cao, Jacobo Diaz-Polo, Julien Grain, Thomas
Cailleteau | Probing Loop Quantum Gravity with Evaporating Black Holes | 5 pages, 3 figures. Version accpeted by Phys. Rev. Lett | Phys. Rev. Lett. 107, 251301 (2011) | 10.1103/PhysRevLett.107.251301 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This letter aims at showing that the observation of evaporating black holes
should allow distinguishing between the usual Hawking behavior and Loop Quantum
Gravity (LQG) expectations. We present a full Monte-Carlo simulation of the
evaporation in LQG and statistical tests that discriminate between competing
models. W... | [
{
"created": "Tue, 20 Sep 2011 08:50:24 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2011 15:43:24 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Barrau",
"Aurelien",
""
],
[
"Cao",
"Xiangyu",
""
],
[
"Diaz-Polo",
"Jacobo",
""
],
[
"Grain",
"Julien",
""
],
[
"Cailleteau",
"Thomas",
""
]
] | This letter aims at showing that the observation of evaporating black holes should allow distinguishing between the usual Hawking behavior and Loop Quantum Gravity (LQG) expectations. We present a full Monte-Carlo simulation of the evaporation in LQG and statistical tests that discriminate between competing models. We ... |
gr-qc/9802019 | null | Thibault Damour, Gilles Esposito-Farese | Light deflection by gravitational waves from localized sources | 12 pages, REVTeX 3.0, no figure | Phys.Rev. D58 (1998) 044003 | 10.1103/PhysRevD.58.044003 | IHES/P/98/11, CPT-98/P.3607 | gr-qc astro-ph | null | We study the deflection of light (and the redshift, or integrated time delay)
caused by the time-dependent gravitational field generated by a localized
material source lying close to the line of sight. Our calculation explicitly
takes into account the full, near-zone, plus intermediate-zone, plus wave-zone,
retarded ... | [
{
"created": "Mon, 9 Feb 1998 14:32:45 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Damour",
"Thibault",
""
],
[
"Esposito-Farese",
"Gilles",
""
]
] | We study the deflection of light (and the redshift, or integrated time delay) caused by the time-dependent gravitational field generated by a localized material source lying close to the line of sight. Our calculation explicitly takes into account the full, near-zone, plus intermediate-zone, plus wave-zone, retarded gr... |
0804.2163 | Antonio De Felice | Salvatore Capozziello, Antonio De Felice | f(R) cosmology by Noether's symmetry | 23 pages, uses RevTeX | JCAP 0808:016,2008 | 10.1088/1475-7516/2008/08/016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general approach to find out exact cosmological solutions in f(R)-gravity
is discussed. Instead of taking into account phenomenological models, we
assume, as a physical criterium, the existence of Noether symmetries in the
cosmological f(R) Lagrangian. As a result, the presence of such symmetries
selects viable mod... | [
{
"created": "Mon, 14 Apr 2008 14:25:16 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jul 2008 08:53:11 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Feb 2010 11:38:05 GMT",
"version": "v3"
}
] | 2010-02-10 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Felice",
"Antonio",
""
]
] | A general approach to find out exact cosmological solutions in f(R)-gravity is discussed. Instead of taking into account phenomenological models, we assume, as a physical criterium, the existence of Noether symmetries in the cosmological f(R) Lagrangian. As a result, the presence of such symmetries selects viable model... |
1902.10269 | Hector O. Silva | Hector O. Silva, Nicol\'as Yunes | Neutron star pulse profile observations as extreme gravity probes | 7 pages, 3 figures. v2: updated title and new appendix | null | 10.1088/1361-6382/ab3560 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The x-ray emission of hot spots on the surface of neutron stars is the prime
target of the Neutron star Interior Composition Explorer (NICER). These x-ray
pulse profiles not only encode information of the bulk properties of these
stars, which teaches us about matter at supranuclear densities, but also about
the space... | [
{
"created": "Wed, 27 Feb 2019 00:01:58 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Aug 2019 22:24:15 GMT",
"version": "v2"
}
] | 2019-08-19 | [
[
"Silva",
"Hector O.",
""
],
[
"Yunes",
"Nicolás",
""
]
] | The x-ray emission of hot spots on the surface of neutron stars is the prime target of the Neutron star Interior Composition Explorer (NICER). These x-ray pulse profiles not only encode information of the bulk properties of these stars, which teaches us about matter at supranuclear densities, but also about the spaceti... |
2004.13010 | Hristu Culetu | Hristu Culetu | Pattern for a star filled with imperfect fluid | 9 pages, minor corrections, two refs added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A static, spherically symmetric spacetime with negative pressures is
conjectured inside a star. The gravitational field is repulsive and so a
central singularity is avoided. The positive energy density and the pressures
of the imperfect fluid are finite everywhere. The Tolman-Komar energy of the
space is negative, as... | [
{
"created": "Sat, 25 Apr 2020 17:03:15 GMT",
"version": "v1"
},
{
"created": "Sat, 2 May 2020 10:42:29 GMT",
"version": "v2"
}
] | 2020-05-05 | [
[
"Culetu",
"Hristu",
""
]
] | A static, spherically symmetric spacetime with negative pressures is conjectured inside a star. The gravitational field is repulsive and so a central singularity is avoided. The positive energy density and the pressures of the imperfect fluid are finite everywhere. The Tolman-Komar energy of the space is negative, as f... |
0712.4122 | Orfeu Bertolami | Catarina Bastos, Orfeu Bertolami, Nuno Costa Dias, Jo\~ao Nuno Prata | Phase-Space Noncommutative Quantum Cosmology | Version to match the one to appear in Phys. Rev. D. Revtex4 style | Phys.Rev.D78:023516,2008 | 10.1103/PhysRevD.78.23516 | DF/IST-8.2007 | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a noncommutative extension of Quantum Cosmology and study the
Kantowski-Sachs (KS) cosmological model requiring that the two scale factors of
the KS metric, the coordinates of the system, and their conjugate canonical
momenta do not commute. Through the ADM formalism, we obtain the Wheeler-DeWitt
(WDW) equ... | [
{
"created": "Wed, 26 Dec 2007 12:15:44 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jul 2008 13:48:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bastos",
"Catarina",
""
],
[
"Bertolami",
"Orfeu",
""
],
[
"Dias",
"Nuno Costa",
""
],
[
"Prata",
"João Nuno",
""
]
] | We present a noncommutative extension of Quantum Cosmology and study the Kantowski-Sachs (KS) cosmological model requiring that the two scale factors of the KS metric, the coordinates of the system, and their conjugate canonical momenta do not commute. Through the ADM formalism, we obtain the Wheeler-DeWitt (WDW) equat... |
2107.01845 | Haowen Zhong | Haowen Zhong, Biping Gong and Taotao Qiu | Gravitational waves from bubble collisions in FLRW spacetime | 16 pages, 8 figures; This paper has been accepted by JHEP | null | 10.1007/JHEP02(2022)077 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stochastic gravitational wave background (SGWB) is a promising tool to probe
the very early universe where the standard model of particle physics and
cosmology are connected closely. As a possible component of SGWB, gravitational
waves (GW) from bubble collisions during the first order cosmological phase
transitions ... | [
{
"created": "Mon, 5 Jul 2021 08:03:06 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jul 2021 07:26:04 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Feb 2022 19:56:17 GMT",
"version": "v3"
}
] | 2022-03-02 | [
[
"Zhong",
"Haowen",
""
],
[
"Gong",
"Biping",
""
],
[
"Qiu",
"Taotao",
""
]
] | Stochastic gravitational wave background (SGWB) is a promising tool to probe the very early universe where the standard model of particle physics and cosmology are connected closely. As a possible component of SGWB, gravitational waves (GW) from bubble collisions during the first order cosmological phase transitions de... |
1008.0795 | Robert Ward | Massimo Granata and Christelle Buy and Robert Ward and Matteo
Barsuglia | Higher-order Laguerre-Gauss mode generation and interferometry for
gravitational wave detectors | 4 pages, 5 figures | Phys.Rev.Lett.105:231102,2010 | 10.1103/PhysRevLett.105.231102 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the first experimental demonstration of higher-order
Laguerre-Gauss (LGpl) mode generation and interferometry using a method
scalable to the requirements of gravitational wave (GW) detection. GW detectors
which use higher-order LGpl modes will be less susceptible to mirror thermal
noise, which is expecte... | [
{
"created": "Wed, 4 Aug 2010 14:48:46 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Sep 2010 12:06:01 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Dec 2010 14:00:21 GMT",
"version": "v3"
}
] | 2010-12-23 | [
[
"Granata",
"Massimo",
""
],
[
"Buy",
"Christelle",
""
],
[
"Ward",
"Robert",
""
],
[
"Barsuglia",
"Matteo",
""
]
] | We report on the first experimental demonstration of higher-order Laguerre-Gauss (LGpl) mode generation and interferometry using a method scalable to the requirements of gravitational wave (GW) detection. GW detectors which use higher-order LGpl modes will be less susceptible to mirror thermal noise, which is expected ... |
1705.09618 | Babak Vakili | H. Ardehali, P. Pedram and B. Vakili | Classical and quantum Chaplygin gas Ho\v{r}ava-Lifshitz scalar-metric
cosmology | 17 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1004.0306 | Acta Phys. Pol. B 48 (2017) 827 | 10.5506/APhysPolB.48.827 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the Friedmann-Robertson-Walker cosmology in which a
Chaplygin gas is coupled to a non-linear scalar field in the framework of the
Ho\v{r}ava-Lifshitz theory. In writing the action of the matter part, we use
the Schutz's formalism so that the only degree of freedom of the Chaplygin gas
plays the... | [
{
"created": "Thu, 25 May 2017 11:32:41 GMT",
"version": "v1"
}
] | 2017-06-27 | [
[
"Ardehali",
"H.",
""
],
[
"Pedram",
"P.",
""
],
[
"Vakili",
"B.",
""
]
] | In this work, we study the Friedmann-Robertson-Walker cosmology in which a Chaplygin gas is coupled to a non-linear scalar field in the framework of the Ho\v{r}ava-Lifshitz theory. In writing the action of the matter part, we use the Schutz's formalism so that the only degree of freedom of the Chaplygin gas plays the r... |
2212.13896 | Branko Dragovich | I. Dimitrijevic, B. Dragovich, Z. Rakic and J. Stankovic | On the Schwarzschild-de Sitter metric of nonlocal de Sitter gravity | 10 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Earlier constructed a simple nonlocal de Sitter gravity model has a
cosmological solution in a very good agreement with astronomical observations.
In this paper, we continue the investigation of the nonlocal de Sitter model of
gravity, focusing on finding an appropriate solution for the Schwarzschild-de
Sitter metric... | [
{
"created": "Mon, 26 Dec 2022 16:28:01 GMT",
"version": "v1"
}
] | 2022-12-29 | [
[
"Dimitrijevic",
"I.",
""
],
[
"Dragovich",
"B.",
""
],
[
"Rakic",
"Z.",
""
],
[
"Stankovic",
"J.",
""
]
] | Earlier constructed a simple nonlocal de Sitter gravity model has a cosmological solution in a very good agreement with astronomical observations. In this paper, we continue the investigation of the nonlocal de Sitter model of gravity, focusing on finding an appropriate solution for the Schwarzschild-de Sitter metric. ... |
1302.5950 | Sean McWilliams | Sean T. McWilliams | Reply to "Comment on `Black Holes are neither Particle Accelerators nor
Dark Matter Probes' " | 2 pages, 1 figure | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We respond to a recent criticism from Zaslavskii (arXiv:1301.3429v2 [gr-qc])
of our article, which appeared in Phys. Rev. Lett. 110 011102 (2013). We
clarify the points of apparent disagreement, none of which relate to the
central result of our original paper, which is the demonstration that the
diverging center-of-m... | [
{
"created": "Sun, 24 Feb 2013 20:39:12 GMT",
"version": "v1"
}
] | 2013-02-26 | [
[
"McWilliams",
"Sean T.",
""
]
] | We respond to a recent criticism from Zaslavskii (arXiv:1301.3429v2 [gr-qc]) of our article, which appeared in Phys. Rev. Lett. 110 011102 (2013). We clarify the points of apparent disagreement, none of which relate to the central result of our original paper, which is the demonstration that the diverging center-of-mas... |
gr-qc/0502020 | Lorenzo Iorio | Lorenzo Iorio | On the possibility of measuring the post-Newtonian gravitoelectric
correction to the orbital period of a test body in a Solar System scenario | LateX2e, 5 pages, two-column, no figures, 1 table, 22 references.
Accepted for publication in Monthly Notices of the Royal Astronomical Society
(MNRAS) | Mon.Not.Roy.Astron.Soc.359:328-333,2005 | 10.1111/j.1365-2966.2005.08912.x | null | gr-qc astro-ph | null | The possibility of measuring the post-Newtonian gravitoelectric correction to
the orbital period of a test particle freely orbiting a spherically symmetric
mass in the Solar System is analyzed. It should be possible, in principle, to
detect it for Mercury at a precision level of 10^-4. This level is mainly set
by the... | [
{
"created": "Sat, 5 Feb 2005 12:45:35 GMT",
"version": "v1"
}
] | 2012-07-31 | [
[
"Iorio",
"Lorenzo",
""
]
] | The possibility of measuring the post-Newtonian gravitoelectric correction to the orbital period of a test particle freely orbiting a spherically symmetric mass in the Solar System is analyzed. It should be possible, in principle, to detect it for Mercury at a precision level of 10^-4. This level is mainly set by the u... |
gr-qc/9704034 | York Xylander | Gerhard Mack | Pushing Einstein's Principles to the Extreme | null | null | null | null | gr-qc hep-lat hep-th | null | In these lectures I propose to push Einstein's principle of coordinate
independence to the extreme in order to restrict the possible form of
fundamental equations of motion in physics. I start from nearly tautological
system theoretic axioms. They provide a minimal amount of a priori structure
which is thought to be ... | [
{
"created": "Mon, 14 Apr 1997 09:07:07 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Mack",
"Gerhard",
""
]
] | In these lectures I propose to push Einstein's principle of coordinate independence to the extreme in order to restrict the possible form of fundamental equations of motion in physics. I start from nearly tautological system theoretic axioms. They provide a minimal amount of a priori structure which is thought to be ch... |
2107.13082 | Vera Delfavero | Vera Delfavero (1), Richard O'Shaughnessy (1), Daniel Wysocki (2),
Anjali Yelikar (1) ((1) Rochester Institute of Technology, (2) University of
Wisconsin - Milwaukee) | Normal Approximate Likelihoods to Gravitational Wave Events | null | null | null | LIGO-P2100274 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave observations of quasicircular compact binary mergers in
principle provide an arbitrarily complex likelihood over eight independent
intrinsic parameters: the masses and spins of the two merging objects. In this
work, we demonstrate by example that a simple normal approximation over fewer
(usually, t... | [
{
"created": "Tue, 27 Jul 2021 21:14:38 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jan 2022 23:00:21 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Delfavero",
"Vera",
""
],
[
"O'Shaughnessy",
"Richard",
""
],
[
"Wysocki",
"Daniel",
""
],
[
"Yelikar",
"Anjali",
""
]
] | Gravitational wave observations of quasicircular compact binary mergers in principle provide an arbitrarily complex likelihood over eight independent intrinsic parameters: the masses and spins of the two merging objects. In this work, we demonstrate by example that a simple normal approximation over fewer (usually, thr... |
2007.01828 | C. S. Unnikrishnan | C. S. Unnikrishnan and George T. Gillies | Gravitational Wave Test of the Strong Equivalence Principle | RevTeX, 8 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Strong Equivalence Principle (SEP) holds the full essence and meaning of
the General Theory of Relativity as the nonlinear relativistic theory of
gravitation. It asserts the universal coupling of gravity to all matter and its
interactions including the gravitational interaction and the gravitational self
energy. ... | [
{
"created": "Thu, 2 Jul 2020 14:35:00 GMT",
"version": "v1"
}
] | 2020-07-06 | [
[
"Unnikrishnan",
"C. S.",
""
],
[
"Gillies",
"George T.",
""
]
] | The Strong Equivalence Principle (SEP) holds the full essence and meaning of the General Theory of Relativity as the nonlinear relativistic theory of gravitation. It asserts the universal coupling of gravity to all matter and its interactions including the gravitational interaction and the gravitational self energy. We... |
1609.03957 | Ramon Herrera | Ramon Herrera, Joel Saavedra and Cuauhtemoc Campuzano | Curvaton reheating in non-minimal derivative coupling to gravity: NO
models | 22 pages, 4 figures | null | 10.1007/s10714-016-2133-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The curvaton reheating mechanism in a non-minimal derivative coupling to
gravity for any non-oscillating (NO) model is studied. In this framework, we
analyze the energy density during the kinetic epoch and we find that this
energy has a complicated dependencies of the scale factor. Considering this
mechanism, we stud... | [
{
"created": "Tue, 13 Sep 2016 18:07:50 GMT",
"version": "v1"
}
] | 2016-10-05 | [
[
"Herrera",
"Ramon",
""
],
[
"Saavedra",
"Joel",
""
],
[
"Campuzano",
"Cuauhtemoc",
""
]
] | The curvaton reheating mechanism in a non-minimal derivative coupling to gravity for any non-oscillating (NO) model is studied. In this framework, we analyze the energy density during the kinetic epoch and we find that this energy has a complicated dependencies of the scale factor. Considering this mechanism, we study ... |
gr-qc/0005034 | Piotr Jaranowski | Thibault Damour, Piotr Jaranowski, and Gerhard Schaefer | On the determination of the last stable orbit for circular general
relativistic binaries at the third post-Newtonian approximation | REVTeX, 25 pages, 3 figures, submitted to Phys. Rev. D | Phys.Rev. D62 (2000) 084011 | 10.1103/PhysRevD.62.084011 | null | gr-qc | null | We discuss the analytical determination of the location of the Last Stable
Orbit (LSO) in circular general relativistic orbits of two point masses. We use
several different ``resummation methods'' (including new ones) based on the
consideration of gauge-invariant functions, and compare the results they give
at the th... | [
{
"created": "Wed, 10 May 2000 17:47:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Damour",
"Thibault",
""
],
[
"Jaranowski",
"Piotr",
""
],
[
"Schaefer",
"Gerhard",
""
]
] | We discuss the analytical determination of the location of the Last Stable Orbit (LSO) in circular general relativistic orbits of two point masses. We use several different ``resummation methods'' (including new ones) based on the consideration of gauge-invariant functions, and compare the results they give at the thir... |
1606.04364 | Ahmad Sheykhi | Ahmad Sheykhi and Fatemeh Shaker | Effects of backreaction and exponential nonlinear electrodynamics on the
holographic superconductors | 17 pages | International Journal of Modern Physics D Vol. 26, No. 5 (2017)
1750050 | 10.1142/S021827181750050X | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We analytically study the properties of a $(2+1)$-dimensional $s$-wave
holographic superconductor in the presence of exponential nonlinear
electrodynamics. We consider the case in which the scalar and gauge fields back
react on the background metric. Employing the analytical Sturm-Liouville
method, we find that in th... | [
{
"created": "Mon, 13 Jun 2016 09:05:35 GMT",
"version": "v1"
}
] | 2017-01-12 | [
[
"Sheykhi",
"Ahmad",
""
],
[
"Shaker",
"Fatemeh",
""
]
] | We analytically study the properties of a $(2+1)$-dimensional $s$-wave holographic superconductor in the presence of exponential nonlinear electrodynamics. We consider the case in which the scalar and gauge fields back react on the background metric. Employing the analytical Sturm-Liouville method, we find that in the ... |
gr-qc/0205081 | Lorenzo Iorio | Lorenzo Iorio | Is it possible to improve the present LAGEOS-LAGEOS II Lense-Thirring
experiment? | LaTeX2e, 1 table, no figures, 8 pages | Classical and Quantum Gravity, vol.19, no.21, pp. 5473-5480, 2002 | 10.1088/0264-9381/19/21/312 | null | gr-qc astro-ph physics.geo-ph physics.space-ph | null | The Lense-Thirring effect is currently being measured by means of a
combination of the orbital residuals of the nodes of LAGEOS and LAGEOS II and
the perigee of LAGEOS II. The total error is of the order of 20%. The most
insidious systematic error is due to the mismodelled even zonal harmonics of
the geopotential and... | [
{
"created": "Sat, 18 May 2002 08:36:14 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jun 2002 08:43:50 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Oct 2002 15:48:08 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | The Lense-Thirring effect is currently being measured by means of a combination of the orbital residuals of the nodes of LAGEOS and LAGEOS II and the perigee of LAGEOS II. The total error is of the order of 20%. The most insidious systematic error is due to the mismodelled even zonal harmonics of the geopotential and a... |
2012.05548 | Gyula Fodor | Gyula Fodor, Etevaldo dos Santos Costa Filho, Betti Hartmann | Calculation of multipole moments of axistationary electrovacuum
spacetimes | 44 pages. Two Mathematica and two equivalent Maple programs are
provided as ancillary files | Phys. Rev. D 104, 064012 (2021) | 10.1103/PhysRevD.104.064012 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The multipole moments of stationary axially symmetric vacuum or electrovacuum
spacetimes can be expressed in terms of the power series expansion coefficients
of the Ernst potential on the axis. In this paper we present a simpler, more
efficient calculation of the multipole moments, applying methods introduced by
B\"a... | [
{
"created": "Thu, 10 Dec 2020 09:40:36 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Fodor",
"Gyula",
""
],
[
"Filho",
"Etevaldo dos Santos Costa",
""
],
[
"Hartmann",
"Betti",
""
]
] | The multipole moments of stationary axially symmetric vacuum or electrovacuum spacetimes can be expressed in terms of the power series expansion coefficients of the Ernst potential on the axis. In this paper we present a simpler, more efficient calculation of the multipole moments, applying methods introduced by B\"ack... |
1607.01378 | Maur\'icio Richartz | Vitor Cardoso, Antonin Coutant, Mauricio Richartz, Silke Weinfurtner | Detecting Rotational Superradiance in Fluid Laboratories | v2: title change, matches published version in PRL | Phys. Rev. Lett. 117, 271101 (2016) | 10.1103/PhysRevLett.117.271101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rotational superradiance was predicted theoretically decades ago, and is
chiefly responsible for a number of important effects and phenomenology in
black-hole physics. However, rotational superradiance has never been observed
experimentally. Here, with the aim of probing superradiance in the lab, we
investigate the b... | [
{
"created": "Tue, 5 Jul 2016 19:32:02 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2016 22:23:50 GMT",
"version": "v2"
}
] | 2017-01-02 | [
[
"Cardoso",
"Vitor",
""
],
[
"Coutant",
"Antonin",
""
],
[
"Richartz",
"Mauricio",
""
],
[
"Weinfurtner",
"Silke",
""
]
] | Rotational superradiance was predicted theoretically decades ago, and is chiefly responsible for a number of important effects and phenomenology in black-hole physics. However, rotational superradiance has never been observed experimentally. Here, with the aim of probing superradiance in the lab, we investigate the beh... |
gr-qc/0610151 | Yungui Gong | Yungui Gong, Bin Wang and Anzhong Wang | Thermodynamical properties of the Universe with dark energy | two figures; v2: minor corrections and updates, JCAP in press | JCAP 0701:024,2007 | 10.1088/1475-7516/2007/01/024 | null | gr-qc astro-ph hep-th | null | We have investigated the thermodynamical properties of the Universe with dark
energy. Adopting the usual assumption in deriving the constant co-moving
entropy density that the physical volume and the temperature are independent,
we observed some strange thermodynamical behaviors. However, these strange
behaviors disa... | [
{
"created": "Mon, 30 Oct 2006 18:16:54 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jan 2007 21:19:14 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Gong",
"Yungui",
""
],
[
"Wang",
"Bin",
""
],
[
"Wang",
"Anzhong",
""
]
] | We have investigated the thermodynamical properties of the Universe with dark energy. Adopting the usual assumption in deriving the constant co-moving entropy density that the physical volume and the temperature are independent, we observed some strange thermodynamical behaviors. However, these strange behaviors disapp... |
2010.15845 | Wei Wei | Wei Wei, Asad Khan, E. A. Huerta, Xiaobo Huang, Minyang Tian | Deep Learning Ensemble for Real-time Gravitational Wave Detection of
Spinning Binary Black Hole Mergers | 10 pages, 7 figures | Physics Letters B 812 (2021) 136029 | 10.1016/j.physletb.2020.136029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the use of deep learning ensembles for real-time, gravitational
wave detection of spinning binary black hole mergers. This analysis consists of
training independent neural networks that simultaneously process strain data
from multiple detectors. The output of these networks is then combined and
processed... | [
{
"created": "Thu, 29 Oct 2020 18:00:03 GMT",
"version": "v1"
}
] | 2020-12-21 | [
[
"Wei",
"Wei",
""
],
[
"Khan",
"Asad",
""
],
[
"Huerta",
"E. A.",
""
],
[
"Huang",
"Xiaobo",
""
],
[
"Tian",
"Minyang",
""
]
] | We introduce the use of deep learning ensembles for real-time, gravitational wave detection of spinning binary black hole mergers. This analysis consists of training independent neural networks that simultaneously process strain data from multiple detectors. The output of these networks is then combined and processed t... |
1011.3281 | Emanuele Berti | Ulrich Sperhake, Emanuele Berti, Vitor Cardoso, Frans Pretorius,
Nicolas Yunes | Superkicks in ultrarelativistic encounters of spinning black holes | 10 pages, 6 figures, 2 tables | Phys.Rev.D83:024037,2011 | 10.1103/PhysRevD.83.024037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study ultrarelativistic encounters of two spinning, equal-mass black holes
through simulations in full numerical relativity. Two initial data sequences
are studied in detail: one that leads to scattering and one that leads to a
grazing collision and merger. In all cases, the initial black hole spins lie in
the orb... | [
{
"created": "Mon, 15 Nov 2010 03:26:32 GMT",
"version": "v1"
}
] | 2011-02-28 | [
[
"Sperhake",
"Ulrich",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Pretorius",
"Frans",
""
],
[
"Yunes",
"Nicolas",
""
]
] | We study ultrarelativistic encounters of two spinning, equal-mass black holes through simulations in full numerical relativity. Two initial data sequences are studied in detail: one that leads to scattering and one that leads to a grazing collision and merger. In all cases, the initial black hole spins lie in the orbit... |
gr-qc/0703065 | Myungseok Yoon | Wontae Kim and Myung Seok Yoon | Positive Equation-of-state Parameter in the Accelerating Dilaton
Cosmology | 9 pages, 4 figures; to appear in the Journal of Korean Physical
Society | null | 10.3938/jkps.50.941 | null | gr-qc | null | In a semiclassically quantized two-dimensional cosmological model, it can be
shown that the parameter of the equation of state for the accelerating universe
can be positive due to the negative energy density and the negative pressure,
which is a little different from the conventional wisdom that the parameter is
nega... | [
{
"created": "Mon, 12 Mar 2007 02:55:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kim",
"Wontae",
""
],
[
"Yoon",
"Myung Seok",
""
]
] | In a semiclassically quantized two-dimensional cosmological model, it can be shown that the parameter of the equation of state for the accelerating universe can be positive due to the negative energy density and the negative pressure, which is a little different from the conventional wisdom that the parameter is negati... |
1602.02875 | Hiroyuki Nakano | Hiroyuki Nakano, Takashi Nakamura, Takahiro Tanaka | The detection of quasinormal mode with $a/M \sim 0.95$ would prove a
sphere $99\%$ soaking in the ergoregion of the Kerr space-time | 8 pages, 5 figures, accepted for publication in PTEP (Submitted on
Jan. 19, 2016) | Prog. Theor. Exp. Phys. (2016) 031E02 | 10.1093/ptep/ptw015 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent numerical relativity simulations of mergers of binary black holes
suggest that the maximum final value of $a/M$ is $\sim 0.95$ for the
coalescence of two equal mass black holes with aligned spins of the same
magnitude $a/M=0.994$ which is close to the upper limit $a/M=0.998$ of
accretion spin-up shown by Thorn... | [
{
"created": "Tue, 9 Feb 2016 06:57:54 GMT",
"version": "v1"
}
] | 2016-03-29 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Nakamura",
"Takashi",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | Recent numerical relativity simulations of mergers of binary black holes suggest that the maximum final value of $a/M$ is $\sim 0.95$ for the coalescence of two equal mass black holes with aligned spins of the same magnitude $a/M=0.994$ which is close to the upper limit $a/M=0.998$ of accretion spin-up shown by Thorne.... |
1511.01260 | Li-Xin Li | Li-Xin Li | A New Unified Theory of Electromagnetic and Gravitational Interactions | 41 pages, including 1 figure and 1 table. A new section is added to
describe the relation to the Kaluza-Klein theory. Version accepted to
Frontiers of Physics | Frontiers of Physics, Volume 11, Issue 6, article id. 110402
(2016) | 10.1007/s11467-016-0588-z | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a new unified theory of electromagnetic and
gravitational interactions. By considering a four-dimensional spacetime as a
hypersurface embedded in a five-dimensional bulk spacetime, we derive the
complete set of field equations in the four-dimensional spacetime from the
five-dimensional Einste... | [
{
"created": "Wed, 4 Nov 2015 09:41:56 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2016 09:13:46 GMT",
"version": "v2"
}
] | 2016-07-05 | [
[
"Li",
"Li-Xin",
""
]
] | In this paper we present a new unified theory of electromagnetic and gravitational interactions. By considering a four-dimensional spacetime as a hypersurface embedded in a five-dimensional bulk spacetime, we derive the complete set of field equations in the four-dimensional spacetime from the five-dimensional Einstein... |
gr-qc/9911041 | Jose Maria Pozo | Jose M. Pozo, Josep M. Parra | Clifford Algebra Approach to Superenergy Tensors | 6 pages, LaTeX, uses ere99.sty, contribution to proceedings of ERE99,
Bilbao, Sep 7th-10th | null | null | null | gr-qc | null | Senovilla has recently defined an algebraic construction of a superenergy
tensor T{A} from any arbitrary tensor A, by structuring it as an r-fold form.
This superenergy tensor satisfies automatically the dominant superenergy
property. We present a more compact definition using the r-direct product
Clifford algebra r-... | [
{
"created": "Wed, 10 Nov 1999 22:55:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pozo",
"Jose M.",
""
],
[
"Parra",
"Josep M.",
""
]
] | Senovilla has recently defined an algebraic construction of a superenergy tensor T{A} from any arbitrary tensor A, by structuring it as an r-fold form. This superenergy tensor satisfies automatically the dominant superenergy property. We present a more compact definition using the r-direct product Clifford algebra r-Cl... |
1212.2880 | Angelo Tartaglia | Angelo Tartaglia (Politecnico di Torino and INFN) | Experimental determination of gravitomagnetic effects by means of ring
lasers | 9 pages, 9 figures, to appear on Journal of Physics: Conference
Series in the proceedings of NEB 15 (Chanya, June 2012) | null | 10.1088/1742-6596/453/1/012019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new experiment aimed to the detection of the gravito-magnetic
Lense-Thirring effect at the surface of the Earth will be presented; the name
of the experiment is GINGER. The proposed technique is based on the behavior of
light beams in ring lasers, also known as gyrolasers. A three-dimensional array
of ringlasers wi... | [
{
"created": "Wed, 12 Dec 2012 16:44:45 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Tartaglia",
"Angelo",
"",
"Politecnico di Torino and INFN"
]
] | A new experiment aimed to the detection of the gravito-magnetic Lense-Thirring effect at the surface of the Earth will be presented; the name of the experiment is GINGER. The proposed technique is based on the behavior of light beams in ring lasers, also known as gyrolasers. A three-dimensional array of ringlasers will... |
2103.07266 | Sebastian V\"olkel | Sebastian H. V\"olkel, Christian J. Kr\"uger, Kostas D. Kokkotas | Bayesian Inverse Problem of Rotating Neutron Stars | Accepted for publication in PRD, 9 pages, 3 figures | null | 10.1103/PhysRevD.103.083008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we provide a framework that connects the co-rotating and counter
rotating $f$-mode frequencies of rotating neutron stars with their stellar
structure. The accurate computation of these modes for realistic equations of
state has been presented recently and they are here used as input for a
Bayesian analys... | [
{
"created": "Thu, 11 Mar 2021 10:30:24 GMT",
"version": "v1"
}
] | 2021-04-21 | [
[
"Völkel",
"Sebastian H.",
""
],
[
"Krüger",
"Christian J.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | In this work we provide a framework that connects the co-rotating and counter rotating $f$-mode frequencies of rotating neutron stars with their stellar structure. The accurate computation of these modes for realistic equations of state has been presented recently and they are here used as input for a Bayesian analysis... |
gr-qc/0104102 | Jose Geraldo Pereira | V. C. de Andrade, L. C. T. Guillen, J. G. Pereira | Teleparallel Spin Connection | 2 pages, RevTeX, to appear in Phys. Rev D (Brief Report) | Phys.Rev. D64 (2001) 027502 | 10.1103/PhysRevD.64.027502 | IFT-P.031/2001 | gr-qc | null | A new expression for the spin connection of teleparallel gravity is proposed,
given by minus the contorsion tensor plus a zero connection. The corresponding
minimal coupling is covariant under local Lorentz transformation, and
equivalent to the minimal coupling prescription of general relativity. With
this coupling p... | [
{
"created": "Mon, 30 Apr 2001 20:57:23 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"de Andrade",
"V. C.",
""
],
[
"Guillen",
"L. C. T.",
""
],
[
"Pereira",
"J. G.",
""
]
] | A new expression for the spin connection of teleparallel gravity is proposed, given by minus the contorsion tensor plus a zero connection. The corresponding minimal coupling is covariant under local Lorentz transformation, and equivalent to the minimal coupling prescription of general relativity. With this coupling pre... |
1306.2168 | Bijan Saha Dr. | Mohd.Zeyauddin and Bijan Saha | Bianchi type V bulk viscous cosmological models with particle creation
in General Relativity | 23 pages, 32 Figures | The European Physical Journal Plus 129 (2014) 177 | 10.1140/epjp/i2014-14177-0 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a spatially homogeneous and anisotropic Bianchi type V model
filled with an imperfect fluid with bulk viscosity and particle creation, is
investigated within the framework of General Relativity. Particle creation and
bulk viscosity have been considered as separate irreversible processes. The
energy- mo... | [
{
"created": "Mon, 10 Jun 2013 11:37:41 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Zeyauddin",
"Mohd.",
""
],
[
"Saha",
"Bijan",
""
]
] | In this paper, a spatially homogeneous and anisotropic Bianchi type V model filled with an imperfect fluid with bulk viscosity and particle creation, is investigated within the framework of General Relativity. Particle creation and bulk viscosity have been considered as separate irreversible processes. The energy- mome... |
1912.11667 | Sukanta Bose | William Dupree and Sukanta Bose | Multi-detector null-stream-based $\chi^2$ statistic for compact binary
coalescence searches | 14 pages, 5 figures, published in Classical and Quantum Gravity | Class. Quantum Grav. 36 (2019) 195012 | 10.1088/1361-6382/ab30cf | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a new multi-detector signal-based discriminator to improve the
sensitivity of searches for gravitational waves from compact binary
coalescences. The new statistic is the traditional $\chi^2$ computed on a
null-stream synthesized from the gravitational-wave detector strain time-series
of three detectors. Th... | [
{
"created": "Wed, 25 Dec 2019 13:33:51 GMT",
"version": "v1"
}
] | 2019-12-30 | [
[
"Dupree",
"William",
""
],
[
"Bose",
"Sukanta",
""
]
] | We develop a new multi-detector signal-based discriminator to improve the sensitivity of searches for gravitational waves from compact binary coalescences. The new statistic is the traditional $\chi^2$ computed on a null-stream synthesized from the gravitational-wave detector strain time-series of three detectors. This... |
1911.10996 | Qingyu Gan | Qingyu Gan, Peng Wang, Houwen Wu and Haitang Yang | Strong cosmic censorship for a scalar field in an
Einstein-Maxwell-Gauss-Bonnet-de Sitter black hole | v1: 24 pages, 6 figures; v2: 24 pages, 6 figures and 1 table.
Significantly revised. Comments and references added | null | null | CTP-SCU/2019019 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that the Christodoulou version of the Strong Cosmic
Censorship (SCC) conjecture can be violated for a scalar field in a
near-extremal Reissner-Nordstrom-de Sitter black hole. In this paper, we
investigate the effects of higher derivative corrections to the
Einstein-Hilbert action on the validity of ... | [
{
"created": "Mon, 25 Nov 2019 15:42:20 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Dec 2019 14:16:33 GMT",
"version": "v2"
}
] | 2019-12-03 | [
[
"Gan",
"Qingyu",
""
],
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
],
[
"Yang",
"Haitang",
""
]
] | It has been shown that the Christodoulou version of the Strong Cosmic Censorship (SCC) conjecture can be violated for a scalar field in a near-extremal Reissner-Nordstrom-de Sitter black hole. In this paper, we investigate the effects of higher derivative corrections to the Einstein-Hilbert action on the validity of SC... |
2010.15771 | Ellery Ames | Ellery Ames, H\r{a}kan Andr\'easson, Oliver Rinne | Dynamics of gravitational collapse in the axisymmetric Einstein-Vlasov
system | Accepted version. 33 pages; 11 figures | null | 10.1088/1361-6382/abdd0c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We numerically investigate the dynamics near black hole formation of
solutions to the Einstein--Vlasov system in axisymmetry. Our results are
obtained using a particle-in-cell and finite difference code based on the
$(2+1)+1$ formulation of the Einstein field equations in axisymmetry. Solutions
are launched from non-... | [
{
"created": "Thu, 29 Oct 2020 17:15:23 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Feb 2021 00:09:25 GMT",
"version": "v2"
}
] | 2021-02-05 | [
[
"Ames",
"Ellery",
""
],
[
"Andréasson",
"Håkan",
""
],
[
"Rinne",
"Oliver",
""
]
] | We numerically investigate the dynamics near black hole formation of solutions to the Einstein--Vlasov system in axisymmetry. Our results are obtained using a particle-in-cell and finite difference code based on the $(2+1)+1$ formulation of the Einstein field equations in axisymmetry. Solutions are launched from non-st... |
gr-qc/0611009 | Daniel Pollack | Yvonne Choquet-Bruhat, James Isenberg and Daniel Pollack | Applications of theorems of Jean Leray to the Einstein-scalar field
equations | null | null | null | null | gr-qc math.AP math.DG | null | The Einstein-scalar field theory can be used to model gravitational physics
with scalar field matter sources. We discuss the initial value formulation of
this field theory, and show that the ideas of Leray can be used to show that
the Einstein-scalar field system of partial differential equations is
well-posed as an ... | [
{
"created": "Thu, 2 Nov 2006 00:24:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Choquet-Bruhat",
"Yvonne",
""
],
[
"Isenberg",
"James",
""
],
[
"Pollack",
"Daniel",
""
]
] | The Einstein-scalar field theory can be used to model gravitational physics with scalar field matter sources. We discuss the initial value formulation of this field theory, and show that the ideas of Leray can be used to show that the Einstein-scalar field system of partial differential equations is well-posed as an ev... |
gr-qc/9704033 | null | Vladimir S. Mashkevich (Institute of Physics, Kiev) | Indeterministic Quantum Gravity and Cosmology VI. Predynamical Geometry
of Spacetime Manifold, Supplementary Conditions for Metric, and CPT | 10 pages, LATEX 2.09 | null | null | IP 5/97 | gr-qc | null | This paper is a continuation of the papers [gr-qc/9409010, gr-qc/9505034,
gr-qc/9603022, gr-qc/9609035, gr-qc/9609046]. The introduction of a prior,
i.e., predynamical global geometry of spacetime manifold is substantiated, and
the geometry is specified. The manifold is an infinite four-cylinder, or tube
in the five-... | [
{
"created": "Sun, 13 Apr 1997 21:36:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mashkevich",
"Vladimir S.",
"",
"Institute of Physics, Kiev"
]
] | This paper is a continuation of the papers [gr-qc/9409010, gr-qc/9505034, gr-qc/9603022, gr-qc/9609035, gr-qc/9609046]. The introduction of a prior, i.e., predynamical global geometry of spacetime manifold is substantiated, and the geometry is specified. The manifold is an infinite four-cylinder, or tube in the five-di... |
1409.0533 | Hirotada Okawa | Hirotada Okawa, Vitor Cardoso, Paolo Pani | On the nonlinear instability of confined geometries | 14 pages, 9 figures; v2:Some improvements in convergence results,
accepted for publication in Physical Review D | null | 10.1103/PhysRevD.90.104032 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of a "weakly-turbulent" instability of anti-de Sitter spacetime
supports the idea that confined fluctuations eventually collapse to black holes
and suggests that similar phenomena might be possible in asymptotically-flat
spacetime, for example in the context of spherically symmetric oscillations of
star... | [
{
"created": "Mon, 1 Sep 2014 20:00:07 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Oct 2014 10:44:32 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Okawa",
"Hirotada",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Pani",
"Paolo",
""
]
] | The discovery of a "weakly-turbulent" instability of anti-de Sitter spacetime supports the idea that confined fluctuations eventually collapse to black holes and suggests that similar phenomena might be possible in asymptotically-flat spacetime, for example in the context of spherically symmetric oscillations of stars ... |
1702.01380 | Ahmad Al-Badawi | Ahmad Al-Badawi | Behaviour of a spin-1/2 particle in Schwarzschild embedded in an
electromagnetic universe | 17 pages, 7 figures. arXiv admin note: substantial text overlap with
arXiv:1702.00368 | General Relativity and Gravitation (2018) 50:16 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Dirac equation is considered in Schwarzschild black hole immersed in an
electromagnetic universe with charge coupling. The equations of the charged
spin-1/2 particle is separated into radial and angular equations by adopting
the Newman-Penrose formalism. The angular equations obtained are similar to the
Schwarzsc... | [
{
"created": "Sun, 5 Feb 2017 08:41:39 GMT",
"version": "v1"
}
] | 2019-07-19 | [
[
"Al-Badawi",
"Ahmad",
""
]
] | The Dirac equation is considered in Schwarzschild black hole immersed in an electromagnetic universe with charge coupling. The equations of the charged spin-1/2 particle is separated into radial and angular equations by adopting the Newman-Penrose formalism. The angular equations obtained are similar to the Schwarzschi... |
1702.02760 | Hakan Cebeci | Hakan Cebeci, N\"ulifer \"Ozdemir, Se\c{c}il \c{S}entorun | The equatorial motion of the charged test particles in
Kerr-Newman-Taub-NUT spacetime | title changed , revised version | Gen. Rel. Grav. 51 , No : 7 , 85 (2019) | 10.1007/s10714-019-2569-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we perform a detailed analysis of the equatorial motion of the
charged test particles in Kerr-Newman-Taub-NUT spacetime. By working out the
orbit equation in the radial direction, we examine possible orbit types. We
investigate the conditions for existence of bound orbits in
causality-preserving region ... | [
{
"created": "Thu, 9 Feb 2017 09:27:58 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2017 13:31:51 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Jul 2019 08:03:51 GMT",
"version": "v3"
}
] | 2019-07-19 | [
[
"Cebeci",
"Hakan",
""
],
[
"Özdemir",
"Nülifer",
""
],
[
"Şentorun",
"Seçil",
""
]
] | In this work, we perform a detailed analysis of the equatorial motion of the charged test particles in Kerr-Newman-Taub-NUT spacetime. By working out the orbit equation in the radial direction, we examine possible orbit types. We investigate the conditions for existence of bound orbits in causality-preserving region as... |
2408.06032 | Michael Ebersold | Michael Ebersold, Tania Regimbau, Nelson Christensen | Next-generation global gravitational-wave detector network: Impact of
detector orientation on compact binary coalescence and stochastic
gravitational-wave background searches | 18 pages, 14 figures, 3 tables | null | null | null | gr-qc astro-ph.CO astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Next-generation gravitational-wave detectors like the Einstein Telescope and
Cosmic Explorer, currently in their preparatory phase, have the potential to
significantly improve our understanding of astrophysics, cosmology and
fundamental physics. We examine how the arm orientations of the proposed
detectors influence ... | [
{
"created": "Mon, 12 Aug 2024 09:48:28 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Ebersold",
"Michael",
""
],
[
"Regimbau",
"Tania",
""
],
[
"Christensen",
"Nelson",
""
]
] | Next-generation gravitational-wave detectors like the Einstein Telescope and Cosmic Explorer, currently in their preparatory phase, have the potential to significantly improve our understanding of astrophysics, cosmology and fundamental physics. We examine how the arm orientations of the proposed detectors influence th... |
1906.12034 | Yunho Kim | Yunho Kim, Archil Kobakhidze, and Zachary S. C. Picker | Probing Quadratic Gravity with Binary Inspirals | 9 pages. v3: Section 4 is modified, results are unaltered. v4:
Matches the journal version | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study gravitational waves generated by binary systems
within an extension of General Relativity which is described by the addition of
quadratic in curvature tensor terms to the Einstein-Hilbert action. Treating
quadratic gravity as an effective theory valid in the low energy/curvature
regime, we arg... | [
{
"created": "Fri, 28 Jun 2019 04:03:50 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2019 04:45:04 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Mar 2020 08:41:44 GMT",
"version": "v3"
},
{
"created": "Mon, 21 Jun 2021 02:59:48 GMT",
"version": "v4"
}
] | 2021-06-22 | [
[
"Kim",
"Yunho",
""
],
[
"Kobakhidze",
"Archil",
""
],
[
"Picker",
"Zachary S. C.",
""
]
] | In this paper, we study gravitational waves generated by binary systems within an extension of General Relativity which is described by the addition of quadratic in curvature tensor terms to the Einstein-Hilbert action. Treating quadratic gravity as an effective theory valid in the low energy/curvature regime, we argue... |
2310.04489 | Mark Ho-Yeuk Cheung | Mark Ho-Yeuk Cheung, Emanuele Berti, Vishal Baibhav, Roberto Cotesta | Extracting linear and nonlinear quasinormal modes from black hole merger
simulations | 38 pages, 22 figures, 2 tables. Interactive plots and code usage
examples available at https://mhycheung.github.io/jaxqualin/. The fitting
formulas in Eq. (13) have been updated to match an erratum accepted by PRD.
None of the figures are affected | Phys. Rev. D 109 (2024) 4, 044069 | 10.1103/PhysRevD.109.044069 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity, when two black holes merge they produce a rotating
(Kerr) black hole remnant. According to perturbation theory, the remnant emits
"ringdown" radiation: a superposition of exponentials with characteristic
complex frequencies that depend only on the remnant's mass and spin. While the
goal of the ... | [
{
"created": "Fri, 6 Oct 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2023 21:21:26 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Aug 2024 23:47:29 GMT",
"version": "v3"
}
] | 2024-08-13 | [
[
"Cheung",
"Mark Ho-Yeuk",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Baibhav",
"Vishal",
""
],
[
"Cotesta",
"Roberto",
""
]
] | In general relativity, when two black holes merge they produce a rotating (Kerr) black hole remnant. According to perturbation theory, the remnant emits "ringdown" radiation: a superposition of exponentials with characteristic complex frequencies that depend only on the remnant's mass and spin. While the goal of the bl... |
gr-qc/0202062 | Delia Ionescu | Delia Ionescu | The Electrogravitational Field of an Electrically Charged Mass Point and
the Causality Principle in RTG | 12 pages, no figures | Theor.Math.Phys. 136 (2003) 1177-1187 | null | null | gr-qc | null | In this paper, I determine the electrogravitational field produced by a
charged mass point according to the Relativistic Theory of Gravitation. The
Causality Principle in the Relativistic Theory of Gravitation will play a very
important part in finding this field. The analytical form and the domain of
definition, i.e... | [
{
"created": "Sun, 17 Feb 2002 23:02:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ionescu",
"Delia",
""
]
] | In this paper, I determine the electrogravitational field produced by a charged mass point according to the Relativistic Theory of Gravitation. The Causality Principle in the Relativistic Theory of Gravitation will play a very important part in finding this field. The analytical form and the domain of definition, i.e t... |
gr-qc/9606033 | Leonid S. Kuzmenkov | Yu.A. Baurov (Central Scientific Research Institute of Machinery,
Moscow), A.A. Efimov and A.A. Shpitalnaya (State Astronomical Observatory of
Russian Academy of Sciences, Pulkovo) | Anisotropy of fast-going processes in the Sun and new interaction in
nature | 5 pages, revtex, 1 eps figure, in one .uue file, published in Fiz.
Mysl Ross. (in russian) | null | null | null | gr-qc astro-ph hep-ph | null | The processing of the galactic coordinates of 3543 solar flares with a
magnitude of 2 or more has shown that the distribution of these fast-going
processes on the surface of the "nonrotating" Sun is irregular and non-random
what testifies that in the near-Sun space an anisotropy takes place which
practically coincide... | [
{
"created": "Fri, 14 Jun 1996 11:56:44 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Baurov",
"Yu. A.",
"",
"Central Scientific Research Institute of Machinery,\n Moscow"
],
[
"Efimov",
"A. A.",
"",
"State Astronomical Observatory of\n Russian Academy of Sciences, Pulkovo"
],
[
"Shpitalnaya",
"A. A.",
"",
"State Astronomical Observatory o... | The processing of the galactic coordinates of 3543 solar flares with a magnitude of 2 or more has shown that the distribution of these fast-going processes on the surface of the "nonrotating" Sun is irregular and non-random what testifies that in the near-Sun space an anisotropy takes place which practically coincides ... |
0906.3847 | Sujitkumar Chatterjee | S. Chatterjee and D. Panigrahi | Dimension Driven Accelerating Universe | null | AIP Conf. Proc. - 2009,THE DARK SIDE OF THE UNIVERSE: 4th
International Workshop on the Dark Side of the Universe; Volume - 1115, pp.
335-340 | 10.1063/1.3131522 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current acceleration of the universe leads us to investigate higher
dimensional gravity theory, which is able to explain acceleration from a
theoretical view point without the need of introducing dark energy by hand. We
argue that the terms containing higher dimensional metric coefficients produce
an extra negati... | [
{
"created": "Sun, 21 Jun 2009 06:08:05 GMT",
"version": "v1"
}
] | 2009-06-26 | [
[
"Chatterjee",
"S.",
""
],
[
"Panigrahi",
"D.",
""
]
] | The current acceleration of the universe leads us to investigate higher dimensional gravity theory, which is able to explain acceleration from a theoretical view point without the need of introducing dark energy by hand. We argue that the terms containing higher dimensional metric coefficients produce an extra negative... |
gr-qc/0002006 | Giovanni Losurdo | Giovanni Losurdo | Active controls in interferometric detectors of gravitational waves:
inertial damping of the VIRGO superattenuator | 11 pages, 9 figures. Lecture given at the "International summer
school on experimental physics of gravitational waves" - Urbino (Italy),
September 6-18, 1999 | null | 10.1142/9789812792846_0014 | null | gr-qc | null | The operation of an interferometer for gravitational waves detection requires
sophisticated feedback controls in many parts of the apparatus. The aim of this
lecture is to introduce the types of problems to be faced in this line of
research. The attention is focused on the "inertial damping" of the test mass
suspensi... | [
{
"created": "Wed, 2 Feb 2000 12:51:09 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2000 15:16:05 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Losurdo",
"Giovanni",
""
]
] | The operation of an interferometer for gravitational waves detection requires sophisticated feedback controls in many parts of the apparatus. The aim of this lecture is to introduce the types of problems to be faced in this line of research. The attention is focused on the "inertial damping" of the test mass suspension... |
1705.02226 | Marcelo J. Reboucas | G. Otalora, M.J. Reboucas | Violation of causality in $f(T)$ gravity | 10 pages, V2: Presentation of Sec.2 improved, references added,
version published in Eur.Phys.J.C | Eur.Phys.J. C 77, 799 (2017) | 10.1140/epjc/s10052-017-5367-7 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | [Abridged] In its standard formulation, the $f(T)$ field equations are not
invariant under local Lorentz transformations, and thus the theory does not
inherit the causal structure of special relativity. A locally Lorentz covariant
$f(T)$ gravity theory has been devised recently, and this local causality
problem has b... | [
{
"created": "Thu, 4 May 2017 02:29:20 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Nov 2017 02:56:50 GMT",
"version": "v2"
}
] | 2017-11-28 | [
[
"Otalora",
"G.",
""
],
[
"Reboucas",
"M. J.",
""
]
] | [Abridged] In its standard formulation, the $f(T)$ field equations are not invariant under local Lorentz transformations, and thus the theory does not inherit the causal structure of special relativity. A locally Lorentz covariant $f(T)$ gravity theory has been devised recently, and this local causality problem has bee... |
1502.01843 | Julian Gonzalez-Ayala | Julian Gonzalez-Ayala and F. Angulo-Brown | Is the $(3+1)-d$ nature of the universe a thermodynamic necessity? | 3 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well established that at early times, long before the time of
radiation-matter equality, the universe could have been well described by a
spatially flat, radiation only model. In this letter we consider the whole
primeval universe as a black body radiation (BBR) system in an $n-$dimensional
Euclidean space. We ... | [
{
"created": "Fri, 6 Feb 2015 10:18:27 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Feb 2015 18:47:39 GMT",
"version": "v2"
}
] | 2015-02-17 | [
[
"Gonzalez-Ayala",
"Julian",
""
],
[
"Angulo-Brown",
"F.",
""
]
] | It is well established that at early times, long before the time of radiation-matter equality, the universe could have been well described by a spatially flat, radiation only model. In this letter we consider the whole primeval universe as a black body radiation (BBR) system in an $n-$dimensional Euclidean space. We pr... |
1802.04401 | Laszlo B. Szabados | L\'aszl\'o B. Szabados | On gravity's role in the genesis of rest masses of classical fields | 21 pages, 3 figures; short, journal version of arXiv:1603.06997 | General Relativity and Gravitation (2018) {\bf 50} 34 | 10.1007/s10714-018-2340-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that in the Einstein-conformally coupled Higgs--Maxwell system
with Friedman-Robertson-Walker symmetries the energy density of the Higgs field
has stable local minimum only if the mean curvature of the $t={\rm const}$
hypersurfaces is less than a finite critical value $\chi_c$, while for greater
mean curv... | [
{
"created": "Tue, 13 Feb 2018 00:03:30 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Szabados",
"László B.",
""
]
] | It is shown that in the Einstein-conformally coupled Higgs--Maxwell system with Friedman-Robertson-Walker symmetries the energy density of the Higgs field has stable local minimum only if the mean curvature of the $t={\rm const}$ hypersurfaces is less than a finite critical value $\chi_c$, while for greater mean curvat... |
1502.06913 | Subenoy Chakraborty | Sujay Kr. Biswas and Subenoy Chakraborty | Dynamical Systems analysis of an interacting dark energy model in the
Brane Scenario | 22 pages, 7 figures | General Relativity and Gravitation 47, 22 (2015) | 10.1007/s10714-015-1866-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the background dynamics in brane cosmology when
dark energy is coupled to dark matter by a suitable interaction. Here we
consider an homogeneous and isotropic Friedmann-Robertson-Walker (FRW) brane
model and the evolution equations are reduced to an autonomous system by
suitable transfor... | [
{
"created": "Fri, 20 Feb 2015 08:28:11 GMT",
"version": "v1"
}
] | 2015-02-25 | [
[
"Biswas",
"Sujay Kr.",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this paper, we investigate the background dynamics in brane cosmology when dark energy is coupled to dark matter by a suitable interaction. Here we consider an homogeneous and isotropic Friedmann-Robertson-Walker (FRW) brane model and the evolution equations are reduced to an autonomous system by suitable transforma... |
1902.10128 | Rogerio Teixeira Cavalcanti | Rogerio Teixeira Cavalcanti | Aspects of Black Hole Physics Beyond General Relativity: extra
dimensions, horizon wave function and applications | Doctoral Thesis | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is devoted to investigate some consequences of black holes physics
beyond the domain of general relativity, mainly in effective extra dimensional
models. The investigation is carried along three gravitational effects, namely
the Hawking radiation, the strong deflection of gravitational lensing and the
forma... | [
{
"created": "Mon, 25 Feb 2019 23:20:41 GMT",
"version": "v1"
}
] | 2019-02-28 | [
[
"Cavalcanti",
"Rogerio Teixeira",
""
]
] | This work is devoted to investigate some consequences of black holes physics beyond the domain of general relativity, mainly in effective extra dimensional models. The investigation is carried along three gravitational effects, namely the Hawking radiation, the strong deflection of gravitational lensing and the formati... |
1001.4157 | Khaled Saaidi | Kh. Saaidi, A. Vajdi, S. W. Rabiei, A. Aghamohammadi, H. Sheikhahmadi | Strong and weak gravitational field in $R+\mu^4/R$ gravity | 7 pages, 3 figures, to be appear in APSS | Astrophys. Space Sci (2012). 337: 739-745 | 10.1007/s10509-011-0871-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new approach for investigating the weak field limit of vacuum
field equations in $f(R)$ gravity and we find the weak field limit of
$f(R)=R+\mu ^4/R$ gravity. Furthermore, we study the strong gravity regime in
$R+\mu^{4}/R$ model of $f(R)$ gravity. We show the existence of strong
gravitational field in... | [
{
"created": "Mon, 25 Jan 2010 15:37:55 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2012 16:55:42 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Jan 2012 15:47:56 GMT",
"version": "v3"
}
] | 2014-01-14 | [
[
"Saaidi",
"Kh.",
""
],
[
"Vajdi",
"A.",
""
],
[
"Rabiei",
"S. W.",
""
],
[
"Aghamohammadi",
"A.",
""
],
[
"Sheikhahmadi",
"H.",
""
]
] | We introduce a new approach for investigating the weak field limit of vacuum field equations in $f(R)$ gravity and we find the weak field limit of $f(R)=R+\mu ^4/R$ gravity. Furthermore, we study the strong gravity regime in $R+\mu^{4}/R$ model of $f(R)$ gravity. We show the existence of strong gravitational field in v... |
2212.04225 | Soham Bhattacharyya | Soham Bhattacharyya | On the equivalence between $ f\left(R\right) $ theories and Einstein
gravity | 6 pages, version as accepted in Classical and Quantum Gravity | null | 10.1088/1361-6382/acfcff | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this brief note we present a somewhat trivial result. Namely, we show that
perturbative off-shell $f(R)$-theory is equivalent to Einstein gravity, as well
as to the Brans-Dicke theory and the Einstein scalar field model. We also
discuss possible generalisation of this result to higher-order gravitational
field mod... | [
{
"created": "Thu, 8 Dec 2022 12:09:28 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Dec 2022 07:18:02 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Sep 2023 05:16:42 GMT",
"version": "v3"
}
] | 2023-09-27 | [
[
"Bhattacharyya",
"Soham",
""
]
] | In this brief note we present a somewhat trivial result. Namely, we show that perturbative off-shell $f(R)$-theory is equivalent to Einstein gravity, as well as to the Brans-Dicke theory and the Einstein scalar field model. We also discuss possible generalisation of this result to higher-order gravitational field model... |
1605.01938 | Enrico Barausse | Fabian Hofmann, Enrico Barausse and Luciano Rezzolla | The final spin from binary black holes in quasi-circular orbits | 6 pages, 3 figures. Matches ApJL accepted version. Coefficients
$\epsilon_\alpha$, $\epsilon_\beta$ and $\epsilon_\gamma$ slightly changed to
reflect dataset filtered of imprecise NR data; contains comparison with newly
published NR catalog | null | 10.3847/2041-8205/825/2/L19 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the problem of predicting the spin magnitude and direction of the
black hole resulting from the merger of two black holes with arbitrary masses
and spins inspiralling in quasi-circular orbits. We do this by analyzing a
catalog of 619 recent numerical-relativity simulations collected from the
literature and... | [
{
"created": "Fri, 6 May 2016 13:49:34 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2016 08:56:46 GMT",
"version": "v2"
}
] | 2016-07-13 | [
[
"Hofmann",
"Fabian",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | We revisit the problem of predicting the spin magnitude and direction of the black hole resulting from the merger of two black holes with arbitrary masses and spins inspiralling in quasi-circular orbits. We do this by analyzing a catalog of 619 recent numerical-relativity simulations collected from the literature and s... |
1608.04228 | Abhay Ashtekar | Abhay Ashtekar, Brajesh Gupt | Quantum Gravity in the Sky: Interplay between fundamental theory and
observations | Invited article, to appear in CQG. This paper is addressed both to
the quantum gravity and cosmology audiences. Cosmologists can focus just on
sections I, IV.C, IV.D and V without loss of continuity. 43 pages, 13
figures. Version 2 contains a few clarifications and new references,
especially to compare and cont... | Class. Quant. Grav. 34, 014002 (2017), (44pp) | 10.1088/1361-6382/34/1/014002 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observational missions have provided us with a reliable model of the
evolution of the universe starting from the last scattering surface all the way
to future infinity. Furthermore given a specific model of inflation, using
quantum field theory on curved space-times this history can be pushed
\emph{back in time} to t... | [
{
"created": "Mon, 15 Aug 2016 10:44:35 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Nov 2016 02:08:50 GMT",
"version": "v2"
}
] | 2017-01-19 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Gupt",
"Brajesh",
""
]
] | Observational missions have provided us with a reliable model of the evolution of the universe starting from the last scattering surface all the way to future infinity. Furthermore given a specific model of inflation, using quantum field theory on curved space-times this history can be pushed \emph{back in time} to the... |
1507.02945 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Wormholes admitting conformal Killing vectors and supported by
generalized Chaplygin gas | 8 pages, one figure | Eur. Phys. J. C, volume 75, 357 (2015) | 10.1140/epjc/s10052-015-3584-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When Morris and Thorne first proposed that traversable wormholes may be
actual physical objects, they concentrated on the geometry by specifying the
shape and redshift functions. This mathematical approach necessarily raises
questins regarding the determination of the required stress-energy tensor. This
paper discuss... | [
{
"created": "Fri, 10 Jul 2015 15:48:31 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2015 14:01:10 GMT",
"version": "v2"
},
{
"created": "Sat, 8 Aug 2015 15:46:25 GMT",
"version": "v3"
}
] | 2015-08-11 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | When Morris and Thorne first proposed that traversable wormholes may be actual physical objects, they concentrated on the geometry by specifying the shape and redshift functions. This mathematical approach necessarily raises questins regarding the determination of the required stress-energy tensor. This paper discusses... |
2202.02173 | Patryk Mach | Patryk Mach and Andrzej Odrzywolek | Accretion of the relativistic Vlasov gas onto a moving Schwarzschild
black hole: Low-temperature limit and numerical aspects | Talk presented at the 7th Conference of the Polish Society on
Relativity, Lodz, Poland, September 20-23, 2021 | Acta Phys. Pol. B Proc. Suppl. 15, 1-A7 (2022) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New developments related to our recent study of the accretion of the Vlasov
gas onto a moving Schwarzschild black hole are presented. We discuss the
low-temperature limit of the mas accretion rate and a simple Monte Carlo
simulation used to check the results obtained in this limit. We also comment on
several numerica... | [
{
"created": "Fri, 4 Feb 2022 15:06:05 GMT",
"version": "v1"
}
] | 2022-02-07 | [
[
"Mach",
"Patryk",
""
],
[
"Odrzywolek",
"Andrzej",
""
]
] | New developments related to our recent study of the accretion of the Vlasov gas onto a moving Schwarzschild black hole are presented. We discuss the low-temperature limit of the mas accretion rate and a simple Monte Carlo simulation used to check the results obtained in this limit. We also comment on several numerical ... |
1006.2600 | Ujjal Debnath | Samarpita Bhattacharya and Ujjal Debnath | Thermodynamical Laws in Horava-Lifshitz Gravity | 7 latex pages, 7 figures | Int.J.Mod.Phys.D20:1191-1204,2011 | 10.1142/S0218271811019323 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have investigated the validity of GSL of thermodynamics in a
universe (open, closed and flat) governed by Ho$\check{\text r}$ava-Lifshitz
gravity. If the universe contains barotropic fluid the corresponding solutions
have been obtained. The validity of GSL have been examined by two approaches:
(i) ro... | [
{
"created": "Mon, 14 Jun 2010 06:39:08 GMT",
"version": "v1"
}
] | 2011-07-25 | [
[
"Bhattacharya",
"Samarpita",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this work, we have investigated the validity of GSL of thermodynamics in a universe (open, closed and flat) governed by Ho$\check{\text r}$ava-Lifshitz gravity. If the universe contains barotropic fluid the corresponding solutions have been obtained. The validity of GSL have been examined by two approaches: (i) robu... |
1907.13311 | Cristiano Germani | Albert Escriv\`a, Cristiano Germani and Ravi K. Sheth | A universal threshold for primordial black hole formation | 5 pages and 5 figures, v3: clarifications and more numerical
evidences for the lower bound added. Version accepted in PRD | Phys. Rev. D 101, 044022 (2020) | 10.1103/PhysRevD.101.044022 | ICC-19-013 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we argue and show numerically that the threshold to form
primordial black holes from an initial spherically symmetric perturbation is,
to an excellent approximation, universal, whenever given in terms of the
compaction function averaged over a sphere of radius $r_m$, where $r_m$ is the
scale on which ... | [
{
"created": "Wed, 31 Jul 2019 05:21:22 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Sep 2019 22:05:24 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Jan 2020 10:25:09 GMT",
"version": "v3"
}
] | 2020-02-19 | [
[
"Escrivà",
"Albert",
""
],
[
"Germani",
"Cristiano",
""
],
[
"Sheth",
"Ravi K.",
""
]
] | In this letter, we argue and show numerically that the threshold to form primordial black holes from an initial spherically symmetric perturbation is, to an excellent approximation, universal, whenever given in terms of the compaction function averaged over a sphere of radius $r_m$, where $r_m$ is the scale on which th... |
gr-qc/0505159 | Andrea Fuster | A. Fuster and J.W. van Holten | Type III Einstein-Yang-Mills solutions | revtex, 4 pages, minor changes, some factors and references
corrected, footnote added | Phys.Rev. D72 (2005) 024011 | 10.1103/PhysRevD.72.024011 | NIKHEF/2005-009 | gr-qc hep-th | null | We construct two distinct classes of exact type III solutions of the D=4
Einstein-Yang-Mills system. The solutions are embeddings of the non-abelian
plane waves in spacetimes in Kundt's class. Reduction of the solutions to type
N leads to generalized $pp$ and Kundt waves. The geodesic equations are briefly
discussed.... | [
{
"created": "Tue, 31 May 2005 14:23:20 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2005 15:07:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fuster",
"A.",
""
],
[
"van Holten",
"J. W.",
""
]
] | We construct two distinct classes of exact type III solutions of the D=4 Einstein-Yang-Mills system. The solutions are embeddings of the non-abelian plane waves in spacetimes in Kundt's class. Reduction of the solutions to type N leads to generalized $pp$ and Kundt waves. The geodesic equations are briefly discussed. |
1604.08939 | Robert R. Caldwell | R. R. Caldwell, C. Devulder, and N. A. Maksimova | Gravitational Wave - Gauge Field Oscillations | 4 pages, 3 figures, 1 animation; replacement matches published
version | Phys. Rev. D 94, 063005 (2016) | 10.1103/PhysRevD.94.063005 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves propagating through a stationary gauge field transform
into gauge field waves and back again. When multiple families of flavor-space
locked gauge fields are present, the gravitational and gauge field waves
exhibit novel dynamics. At high frequencies, the system behaves like coupled
oscillators in ... | [
{
"created": "Fri, 29 Apr 2016 19:12:39 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jun 2017 20:05:09 GMT",
"version": "v2"
}
] | 2017-06-05 | [
[
"Caldwell",
"R. R.",
""
],
[
"Devulder",
"C.",
""
],
[
"Maksimova",
"N. A.",
""
]
] | Gravitational waves propagating through a stationary gauge field transform into gauge field waves and back again. When multiple families of flavor-space locked gauge fields are present, the gravitational and gauge field waves exhibit novel dynamics. At high frequencies, the system behaves like coupled oscillators in wh... |
2003.13730 | Yolbeiker Rodr\'iguez Baez | Radouane Gannouji and Yolbeiker Rodr\'iguez Baez | Critical collapse in K-essence models | 19 pages, 7 figures; v2: accepted by JHEP, comments + appendix added,
references updated | J. High Energ. Phys. 2020, 132 (2020) | 10.1007/JHEP07(2020)132 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational collapse in K-essence model with shift symmetry. For
these models, we have the formation of two types of horizons, event and sonic.
For the particular case $K(X)=X+\beta X^2$ we found three different regimes. In
the weak field regime the scalar field disperses to infinity, in the very
strong re... | [
{
"created": "Mon, 30 Mar 2020 18:25:27 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jul 2020 15:28:21 GMT",
"version": "v2"
}
] | 2020-07-28 | [
[
"Gannouji",
"Radouane",
""
],
[
"Baez",
"Yolbeiker Rodríguez",
""
]
] | We study gravitational collapse in K-essence model with shift symmetry. For these models, we have the formation of two types of horizons, event and sonic. For the particular case $K(X)=X+\beta X^2$ we found three different regimes. In the weak field regime the scalar field disperses to infinity, in the very strong regi... |
1608.07118 | Jiri Podolsky | Jiri Podolsky, Robert Svarc | Algebraic classification of Robinson-Trautman spacetimes | 23 pages, no figures, slightly extended version of the Phys. Rev. D
paper | Phys. Rev. D 94, 064043 (2016) | 10.1103/PhysRevD.94.064043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a general class of four-dimensional geometries admitting a null
vector field that has no twist and no shear but has an arbitrary expansion. We
explicitly present the Petrov classification of such Robinson-Trautman (and
Kundt) gravitational fields, based on the algebraic properties of the Weyl
tensor. In p... | [
{
"created": "Thu, 25 Aug 2016 12:48:07 GMT",
"version": "v1"
}
] | 2017-05-08 | [
[
"Podolsky",
"Jiri",
""
],
[
"Svarc",
"Robert",
""
]
] | We consider a general class of four-dimensional geometries admitting a null vector field that has no twist and no shear but has an arbitrary expansion. We explicitly present the Petrov classification of such Robinson-Trautman (and Kundt) gravitational fields, based on the algebraic properties of the Weyl tensor. In par... |
2104.00195 | Carlos A. S. Almeida | A. R. P. Moreira, J. E. G. Silva and C.A.S. Almeida | Fermion localization in braneworld teleparallel f(T,B) gravity | 12 pages, 7 figures. To appear in European Physical Journal C | European Physical Journal C, 81 (2021) 298 | 10.1140/epjc/s10052-021-09106-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a spin 1/2 fermion in a thick braneworld in the context of
teleparallel $f(T, B)$ gravity. Here, $f(T,B)$ is such that
$f_1(T,B)=T+k_1B^{n_1}$ and $f_2(T,B)=B+k_2T^{n_2}$, where $n_{1,2}$ and
$k_{1,2}$ are parameters that control the influence of torsion and the boundary
term. We assume Yukawa coupling, wher... | [
{
"created": "Thu, 1 Apr 2021 01:49:24 GMT",
"version": "v1"
}
] | 2021-04-13 | [
[
"Moreira",
"A. R. P.",
""
],
[
"Silva",
"J. E. G.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] | We study a spin 1/2 fermion in a thick braneworld in the context of teleparallel $f(T, B)$ gravity. Here, $f(T,B)$ is such that $f_1(T,B)=T+k_1B^{n_1}$ and $f_2(T,B)=B+k_2T^{n_2}$, where $n_{1,2}$ and $k_{1,2}$ are parameters that control the influence of torsion and the boundary term. We assume Yukawa coupling, where ... |
2305.09157 | Umananda Dev Goswami | Nashiba Parbin, Dhruba Jyoti Gogoi and Umananda Dev Goswami | Weak gravitational lensing and shadow cast by rotating black holes in
axionic Chern-Simons theory | 18 pages and 9 figures. Published in Physics of the Dark Universe | Physics of the Dark Universe 41 (2023) 101265 | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the impact of the axionic coupling parameter on the bending
angle of light and the shadow cast by slowly rotating black holes in
Chern-Simons modified gravity. We utilize the Ishihara \etal method to derive
the deflection angle of light for an observer and source located at finite
distances from a lens... | [
{
"created": "Tue, 16 May 2023 04:17:51 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jun 2023 12:50:25 GMT",
"version": "v2"
}
] | 2023-06-16 | [
[
"Parbin",
"Nashiba",
""
],
[
"Gogoi",
"Dhruba Jyoti",
""
],
[
"Goswami",
"Umananda Dev",
""
]
] | We investigate the impact of the axionic coupling parameter on the bending angle of light and the shadow cast by slowly rotating black holes in Chern-Simons modified gravity. We utilize the Ishihara \etal method to derive the deflection angle of light for an observer and source located at finite distances from a lens o... |
2009.09527 | Gregory J. Galloway | Michael Eichmair, Gregory J. Galloway, Abra\~ao Mendes | Initial data rigidity results | 22 pages. Final version. Published in Commun. Math. Phys., vol. 386
(2021). All comments welcome | null | 10.1007/s00220-021-04033-x | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present several rigidity results for initial data sets motivated by the
positive mass theorem. An important step in our proofs here is to establish
conditions that ensure that a marginally outer trapped surface is "weakly
outermost". A rigidity result for Riemannian manifolds with a lower bound on
their scalar cur... | [
{
"created": "Sun, 20 Sep 2020 21:28:50 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Mar 2023 03:30:11 GMT",
"version": "v2"
}
] | 2023-03-07 | [
[
"Eichmair",
"Michael",
""
],
[
"Galloway",
"Gregory J.",
""
],
[
"Mendes",
"Abraão",
""
]
] | We present several rigidity results for initial data sets motivated by the positive mass theorem. An important step in our proofs here is to establish conditions that ensure that a marginally outer trapped surface is "weakly outermost". A rigidity result for Riemannian manifolds with a lower bound on their scalar curva... |
gr-qc/9504027 | null | Bj{\o}rn Jensen and Ulf Lindstr\"om | Rotating Dilaton Black Holes | 11 pages, RevTex, one figure included | Phys.Rev. D52 (1995) 3543-3547 | 10.1103/PhysRevD.52.3543 | Oslo-TP 6-95 and USITP-95-05 | gr-qc hep-th | null | We consider the axially symmetric coupled system of gravitation,
electromagnetism and a dilaton field. Reducing from four to three dimensions,
the system is described by gravity coupled to a non-linear $\sigma$-model. We
find the target space isometries and use them to generate new solutions. It
seems that it is only... | [
{
"created": "Wed, 19 Apr 1995 17:14:58 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Jensen",
"Bjørn",
""
],
[
"Lindström",
"Ulf",
""
]
] | We consider the axially symmetric coupled system of gravitation, electromagnetism and a dilaton field. Reducing from four to three dimensions, the system is described by gravity coupled to a non-linear $\sigma$-model. We find the target space isometries and use them to generate new solutions. It seems that it is only p... |
0911.1811 | Shinji Tsujikawa | Antonio De Felice, David F. Mota, Shinji Tsujikawa | Matter instabilities in general Gauss-Bonnet gravity | 9 pages, 2 figures, published PRD version | Phys.Rev.D81:023532,2010 | 10.1103/PhysRevD.81.023532 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of cosmological perturbations in f(G) gravity, where
the Lagrangian is the sum of a Ricci scalar R and an arbitrary function f in
terms of a Gauss-Bonnet term G. We derive the equations for perturbations
assuming matter to be described by a perfect fluid with a constant equation of
state w. We ... | [
{
"created": "Tue, 10 Nov 2009 01:04:21 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jan 2010 00:29:03 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Jan 2010 15:02:21 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"De Felice",
"Antonio",
""
],
[
"Mota",
"David F.",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We study the evolution of cosmological perturbations in f(G) gravity, where the Lagrangian is the sum of a Ricci scalar R and an arbitrary function f in terms of a Gauss-Bonnet term G. We derive the equations for perturbations assuming matter to be described by a perfect fluid with a constant equation of state w. We sh... |
1409.7385 | Hermano Velten | A. M. Oliveira, H. E. S. Velten, J. C. Fabris and I. G. Salako | Newtonian View of General Relativistic Stars | 6 pages, 3 figures. v2 matches accepted version (EPJC) | Eur.Phys.J. C74 (2014) 11, 3170 | 10.1140/epjc/s10052-014-3170-2 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although general relativistic cosmological solutions, even in the presence of
pressure, can be mimicked by using neo-Newtonian hydrodynamics, it is not clear
whether there exists the same Newtonian correspondence for spherical static
configurations. General relativity solutions for stars are known as the
Tolman-Oppen... | [
{
"created": "Thu, 25 Sep 2014 13:09:12 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 2014 09:51:52 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Oliveira",
"A. M.",
""
],
[
"Velten",
"H. E. S.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Salako",
"I. G.",
""
]
] | Although general relativistic cosmological solutions, even in the presence of pressure, can be mimicked by using neo-Newtonian hydrodynamics, it is not clear whether there exists the same Newtonian correspondence for spherical static configurations. General relativity solutions for stars are known as the Tolman-Oppenhe... |
2203.02338 | Mahmut Elbistan | Mahmut Elbistan | Circularly polarized periodic gravitational wave and the Pais-Uhlenbeck
oscillator | 14 pages, version to appear in Nuclear Physics B | Nuclear Physics B 980 (2022) 115846 | 10.1016/j.nuclphysb.2022.115846 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | The "Bargmann framework" allows us to prove the equivalence of the
Pais-Uhlenbeck oscillator with a spin-zero particle in a circularly polarized
periodic gravitational wave. Pushing forward the symmetries (which include
Carroll symmetry) of the latter, we derive conserved charges for the
Pais-Uhlenbeck oscillator.
| [
{
"created": "Fri, 4 Mar 2022 14:23:52 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2022 15:15:48 GMT",
"version": "v2"
},
{
"created": "Wed, 25 May 2022 12:47:51 GMT",
"version": "v3"
}
] | 2022-05-27 | [
[
"Elbistan",
"Mahmut",
""
]
] | The "Bargmann framework" allows us to prove the equivalence of the Pais-Uhlenbeck oscillator with a spin-zero particle in a circularly polarized periodic gravitational wave. Pushing forward the symmetries (which include Carroll symmetry) of the latter, we derive conserved charges for the Pais-Uhlenbeck oscillator. |
2012.00320 | Chen Wu | Zening Yan, Chen Wu and Wenjun Guo | Scalar field quasinormal modes of noncommutative high dimensional
Schwarzschild-Tangherlini black hole spacetime with smeared matter sources | 26 pages, 11 figures, to be appeared in Nucl. phys. B | null | 10.1016/j.nuclphysb.2020.115217 | null | gr-qc nucl-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We investigate the massless scalar quasinormal modes (QNMs) of the
noncommutative $D$-dimensional Schwarzschild-Tangherlini black hole spacetime
in this paper. By using the Wentzel-Kramers-Brillouin (WKB) approximation
method, the asymptotic iterative method (AIM) and the inverted potential method
(IPM) method, we ma... | [
{
"created": "Tue, 1 Dec 2020 07:52:36 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Yan",
"Zening",
""
],
[
"Wu",
"Chen",
""
],
[
"Guo",
"Wenjun",
""
]
] | We investigate the massless scalar quasinormal modes (QNMs) of the noncommutative $D$-dimensional Schwarzschild-Tangherlini black hole spacetime in this paper. By using the Wentzel-Kramers-Brillouin (WKB) approximation method, the asymptotic iterative method (AIM) and the inverted potential method (IPM) method, we made... |
2310.15522 | Kenji Tsuji | Kenji Tsuji, Tomohiro Ishikawa, Kentaro Komori, Koji Nagano, Yutaro
Enomoto, Yuta Michimura, Kurumi Umemura, Ryuma Shimizu, Bin Wu, Shoki
Iwaguchi, Yuki Kawasaki, Akira Furusawa, Seiji Kawamura | Optimization of quantum noise in space gravitational-wave antenna DECIGO
with optical-spring quantum locking considering mixture of vacuum
fluctuations in homodyne detection | 12 pages, 5 figures | null | null | null | gr-qc astro-ph.IM physics.ins-det | http://creativecommons.org/licenses/by/4.0/ | Quantum locking using optical spring and homodyne detection has been devised
to reduce quantum noise that limits the sensitivity of DECIGO, a space-based
gravitational wave antenna in the frequency band around 0.1 Hz for detection of
primordial gravitational waves. The reduction in the upper limit of energy
density $... | [
{
"created": "Tue, 24 Oct 2023 05:04:14 GMT",
"version": "v1"
}
] | 2023-10-25 | [
[
"Tsuji",
"Kenji",
""
],
[
"Ishikawa",
"Tomohiro",
""
],
[
"Komori",
"Kentaro",
""
],
[
"Nagano",
"Koji",
""
],
[
"Enomoto",
"Yutaro",
""
],
[
"Michimura",
"Yuta",
""
],
[
"Umemura",
"Kurumi",
""
],
[
... | Quantum locking using optical spring and homodyne detection has been devised to reduce quantum noise that limits the sensitivity of DECIGO, a space-based gravitational wave antenna in the frequency band around 0.1 Hz for detection of primordial gravitational waves. The reduction in the upper limit of energy density ${\... |
2306.14023 | Luciano Petruzziello | Luca Buoninfante, Giuseppe Gaetano Luciano, Luciano Petruzziello and
Luca Smaldone | Neutrino decoherence and violation of the strong equivalence principle | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We analyze the dynamics of neutrino Gaussian wave-packets, the damping of
flavor oscillations and decoherence effects within the framework of extended
theories of gravity. In particular, we show that, when the underlying
description of the gravitational interaction admits a violation of the strong
equivalence princip... | [
{
"created": "Sat, 24 Jun 2023 17:19:38 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2023 07:52:18 GMT",
"version": "v2"
}
] | 2023-10-17 | [
[
"Buoninfante",
"Luca",
""
],
[
"Luciano",
"Giuseppe Gaetano",
""
],
[
"Petruzziello",
"Luciano",
""
],
[
"Smaldone",
"Luca",
""
]
] | We analyze the dynamics of neutrino Gaussian wave-packets, the damping of flavor oscillations and decoherence effects within the framework of extended theories of gravity. In particular, we show that, when the underlying description of the gravitational interaction admits a violation of the strong equivalence principle... |
2208.03509 | Michael Zlotnikov | Michael Zlotnikov | Inflation Alternative via the Gravitational Field of a Singularity | 17 pages, 3 figures | 2024 Class. Quantum Grav | 10.1088/1361-6382/ad210d | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We explore the scenario that the observable universe emerged from the
vicinity of a negative mass ring singularity, and all content of the universe
travels at the same group velocity close to the speed of light on a geodesic
trajectory along the axis of rotation of the singularity. In appropriate
coordinate parametri... | [
{
"created": "Sat, 6 Aug 2022 12:36:47 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2023 04:20:26 GMT",
"version": "v2"
}
] | 2024-01-24 | [
[
"Zlotnikov",
"Michael",
""
]
] | We explore the scenario that the observable universe emerged from the vicinity of a negative mass ring singularity, and all content of the universe travels at the same group velocity close to the speed of light on a geodesic trajectory along the axis of rotation of the singularity. In appropriate coordinate parametriza... |
gr-qc/0003052 | Santiago Esteban Perez Bergliaffa | M. Novello, S. E. Perez Bergliaffa, and J. M. Salim | Singularities in General Relativity coupled to nonlinear electrodynamics | 7 pages, 6 figures. One reference added. Expression of the effective
potential corrected, without change in the conclusions | Class.Quant.Grav. 17 (2000) 3821-3832 | 10.1088/0264-9381/17/18/316 | null | gr-qc | null | We study here some consequences of the nonlinearities of the electromagnetic
field acting as a source of Einstein's equations on the propagation of photons.
We restrict to the particular case of a ``regular black hole'', and show that
there exist singularities in the effective geometry. These singularities may be
hid... | [
{
"created": "Mon, 13 Mar 2000 20:19:45 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Apr 2000 21:50:05 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Novello",
"M.",
""
],
[
"Bergliaffa",
"S. E. Perez",
""
],
[
"Salim",
"J. M.",
""
]
] | We study here some consequences of the nonlinearities of the electromagnetic field acting as a source of Einstein's equations on the propagation of photons. We restrict to the particular case of a ``regular black hole'', and show that there exist singularities in the effective geometry. These singularities may be hidde... |
1910.13499 | F Shojai | R. Saadati, F. Shojai | Bending of light in the Universe filled with quintessential dark energy | 14 pages, Accepted for publication in Phys. Rev. D | Phys. Rev. D 100, 104041 (2019) | 10.1103/PhysRevD.100.104041 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a local effect of dynamical dark energy, bending of light in the presence
of a spherically symmetric and static black hole surrounded by quintessence has
been studied. Having in mind recent observational data, we have treated the
problem as a deviation from Kottler space-time. This deviation is measured by a
pertu... | [
{
"created": "Tue, 29 Oct 2019 19:49:01 GMT",
"version": "v1"
}
] | 2019-11-25 | [
[
"Saadati",
"R.",
""
],
[
"Shojai",
"F.",
""
]
] | As a local effect of dynamical dark energy, bending of light in the presence of a spherically symmetric and static black hole surrounded by quintessence has been studied. Having in mind recent observational data, we have treated the problem as a deviation from Kottler space-time. This deviation is measured by a perturb... |
0807.4171 | Kazuhiro Hayama | Kazuhiro Hayama, Shantanu Desai, Soumya D. Mohanty, Malik Rakhmanov,
Tiffany Summerscales, Sanichiro Yoshida | Source Tracking for Sco X-1 | Accepted for the publication in CQG | Class. Quant. Grav.25:184021, 2008 | 10.1088/0264-9381/25/18/184021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sco X-1, the brightest low mass X-ray binary, is likely to be a source for
gravitational wave emission. In one mechanism, emission of a gravitational wave
arrests the increase in spin frequency due to the accretion torque in a low
mass X-ray binary. Since the gravitational waveform is unknown, a detection
method assu... | [
{
"created": "Fri, 25 Jul 2008 19:40:13 GMT",
"version": "v1"
}
] | 2009-02-23 | [
[
"Hayama",
"Kazuhiro",
""
],
[
"Desai",
"Shantanu",
""
],
[
"Mohanty",
"Soumya D.",
""
],
[
"Rakhmanov",
"Malik",
""
],
[
"Summerscales",
"Tiffany",
""
],
[
"Yoshida",
"Sanichiro",
""
]
] | Sco X-1, the brightest low mass X-ray binary, is likely to be a source for gravitational wave emission. In one mechanism, emission of a gravitational wave arrests the increase in spin frequency due to the accretion torque in a low mass X-ray binary. Since the gravitational waveform is unknown, a detection method assumi... |
2103.05389 | Valerio Faraoni | Valerio Faraoni (Bishop's University) and Andrea Giusti (ETH Zurich) | Thermodynamics of scalar-tensor gravity | 5 pages. Corrected Eq. (26) describing the approach to equilibrium
and one typographical error. Matches Letter to appear in Physical Review D | Phys. Rev. D 103, 121501 (2021) | 10.1103/PhysRevD.103.L121501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previously, the Einstein equation has been described as an equation of state,
general relativity as the equilibrium state of gravity, and $f({\cal R})$
gravity as a non-equilibrium one. We apply Eckart's first order thermodynamics
to the effective dissipative fluid describing scalar-tensor gravity.
Surprisingly, we o... | [
{
"created": "Tue, 9 Mar 2021 12:15:33 GMT",
"version": "v1"
},
{
"created": "Sun, 9 May 2021 00:42:04 GMT",
"version": "v2"
}
] | 2021-06-09 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
],
[
"Giusti",
"Andrea",
"",
"ETH Zurich"
]
] | Previously, the Einstein equation has been described as an equation of state, general relativity as the equilibrium state of gravity, and $f({\cal R})$ gravity as a non-equilibrium one. We apply Eckart's first order thermodynamics to the effective dissipative fluid describing scalar-tensor gravity. Surprisingly, we obt... |
2209.07416 | Stefano Rinaldi | Stefano Rinaldi, Hannah Middleton, Walter Del Pozzo, Jonathan Gair | Bayesian analysis of systematic errors in the determination of the
constant of gravitation | 11 pages, 2 figures. Accepted for publication in EPJ C | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Measurements of the gravitational constant $G$ are notoriously difficult.
Individual state-of-the-art experiments have managed to determine the value of
$G$ with high precision: although, when considered collectively, the range in
the measured values of $G$ far exceeds individual uncertainties, suggesting the
presenc... | [
{
"created": "Thu, 15 Sep 2022 16:11:50 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Sep 2023 08:06:00 GMT",
"version": "v2"
}
] | 2023-09-26 | [
[
"Rinaldi",
"Stefano",
""
],
[
"Middleton",
"Hannah",
""
],
[
"Del Pozzo",
"Walter",
""
],
[
"Gair",
"Jonathan",
""
]
] | Measurements of the gravitational constant $G$ are notoriously difficult. Individual state-of-the-art experiments have managed to determine the value of $G$ with high precision: although, when considered collectively, the range in the measured values of $G$ far exceeds individual uncertainties, suggesting the presence ... |
2107.01083 | Thomas Celora | Thomas Celora, Nils Andersson, Ian Hawke and Gregory L. Comer | A covariant approach to relativistic large-eddy simulations: The
fibration picture | Version as published on Phys. Rev. D | Phys. Rev. D 104, 084090 (2021) | 10.1103/PhysRevD.104.084090 | null | gr-qc astro-ph.HE physics.flu-dyn | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Models of turbulent flows require the resolution of a vast range of scales,
from large eddies to small-scale features directly associated with dissipation.
As the required resolution is not within reach of large scale numerical
simulations, standard strategies involve a smoothing of the fluid dynamics,
either through... | [
{
"created": "Fri, 2 Jul 2021 13:51:36 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2021 10:56:36 GMT",
"version": "v2"
}
] | 2021-10-28 | [
[
"Celora",
"Thomas",
""
],
[
"Andersson",
"Nils",
""
],
[
"Hawke",
"Ian",
""
],
[
"Comer",
"Gregory L.",
""
]
] | Models of turbulent flows require the resolution of a vast range of scales, from large eddies to small-scale features directly associated with dissipation. As the required resolution is not within reach of large scale numerical simulations, standard strategies involve a smoothing of the fluid dynamics, either through t... |
1906.04465 | Arvin Ravanpak | Arvin Ravanpak and Golnaz Farpour Fadakar | Dynamical System Analysis of Brane Induced Gravity with Tachyon Field | null | Class. Quantum Grav. 36 (2019) 235003 | 10.1088/1361-6382/ab4eec | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript we use the dynamical system approach to study the linear
dynamics of a normal DGP brane-world model with a tachyon field as the dark
energy component. Our focus is on a Gaussian tachyonic potential in which the
parameter $\lambda=-V_\phi/V^{3/2}$, goes to infinity. One of the most
important results... | [
{
"created": "Tue, 11 Jun 2019 09:50:31 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Nov 2019 12:02:04 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Ravanpak",
"Arvin",
""
],
[
"Fadakar",
"Golnaz Farpour",
""
]
] | In this manuscript we use the dynamical system approach to study the linear dynamics of a normal DGP brane-world model with a tachyon field as the dark energy component. Our focus is on a Gaussian tachyonic potential in which the parameter $\lambda=-V_\phi/V^{3/2}$, goes to infinity. One of the most important results o... |
1404.1681 | Jun-Wang Lu | Ya-Bo Wu, Yue-Yue Zhao, Jun-Wang Lu, Xue Zhang, Cheng-Yuan Zhang,
Jia-Wei Qiao | Five-dimensional generalized $f(R)$ gravity with curvature-matter
coupling | arXiv admin note: text overlap with arXiv:0912.4581,
arXiv:gr-qc/0411066 by other authors | Eur. Phys. J . C (2014) 74 :2791 | 10.1140/epjc/s10052-014-2791-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized $f(R)$ gravity with curvature-matter coupling in
five-dimensional (5D) spacetime can be established by assuming a
hypersurface-orthogonal spacelike Killing vector field of 5D spacetime, and it
can be reduced to the 4D formulism of FRW universe. This theory is quite
general and can give the correspondi... | [
{
"created": "Mon, 7 Apr 2014 07:58:38 GMT",
"version": "v1"
}
] | 2014-04-22 | [
[
"Wu",
"Ya-Bo",
""
],
[
"Zhao",
"Yue-Yue",
""
],
[
"Lu",
"Jun-Wang",
""
],
[
"Zhang",
"Xue",
""
],
[
"Zhang",
"Cheng-Yuan",
""
],
[
"Qiao",
"Jia-Wei",
""
]
] | The generalized $f(R)$ gravity with curvature-matter coupling in five-dimensional (5D) spacetime can be established by assuming a hypersurface-orthogonal spacelike Killing vector field of 5D spacetime, and it can be reduced to the 4D formulism of FRW universe. This theory is quite general and can give the corresponding... |
gr-qc/9906025 | Guendel Eduardo | E.I. Guendelman | Scale Symmetry Spontaneously Broken by Asymptotic Behavior | null | Class.Quant.Grav. 17 (2000) 361-372 | 10.1088/0264-9381/17/2/307 | null | gr-qc | null | Conserved quantities are obtained and analyzed in the new models with global
scale invariance recently proposed. Such models allow for non tivial scalar
field potentials and masses for particles, so that the scale symmetry must be
broken somehow. We get to this conclusion by showing that the infrared behavior
of the ... | [
{
"created": "Mon, 7 Jun 1999 09:34:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Guendelman",
"E. I.",
""
]
] | Conserved quantities are obtained and analyzed in the new models with global scale invariance recently proposed. Such models allow for non tivial scalar field potentials and masses for particles, so that the scale symmetry must be broken somehow. We get to this conclusion by showing that the infrared behavior of the co... |
1901.05953 | T. P. Singh | Tejinder P. Singh | Outline for a quantum theory of gravity | v1: 7 pages, one figure; v2: 7 pages, one figure, minor
modifications, accepted for publication in Zeitschrift f\"ur Naturforschung | Z. Naturforsch. A 74 (2019) 383 | 10.1515/zna-2019-0027 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By invoking an asymmetric metric tensor, and borrowing ideas from
non-commutative geometry, string theory, and trace dynamics, we propose an
action function for quantum gravity. The action is proportional to the four
dimensional non-commutative curvature scalar (which is torsion dependent) that
is sourced by the Namb... | [
{
"created": "Thu, 17 Jan 2019 18:50:07 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2019 09:51:52 GMT",
"version": "v2"
}
] | 2019-07-01 | [
[
"Singh",
"Tejinder P.",
""
]
] | By invoking an asymmetric metric tensor, and borrowing ideas from non-commutative geometry, string theory, and trace dynamics, we propose an action function for quantum gravity. The action is proportional to the four dimensional non-commutative curvature scalar (which is torsion dependent) that is sourced by the Nambu-... |
0712.0565 | Diego Pavon | Diego Pavon (Univ. Autonoma de Barcelona), Bin Wang (Fudan University) | Le Chatelier-Braun principle in cosmological physics | 6 pages, revtex file, no figures; version accepted for publication in
General Relativity and Gravitation | Gen.Rel.Grav.41:1-5,2009 | 10.1007/s10714-008-0656-y | null | gr-qc astro-ph hep-ph | null | Assuming that dark energy may be treated as a fluid with a well defined
temperature, close to equilibrium, we argue that if nowadays there is a
transfer of energy between dark energy and dark matter, it must be such that
the latter gains energy from the former and not the other way around.
| [
{
"created": "Tue, 4 Dec 2007 16:25:11 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Apr 2008 11:40:30 GMT",
"version": "v2"
}
] | 2009-01-16 | [
[
"Pavon",
"Diego",
"",
"Univ. Autonoma de Barcelona"
],
[
"Wang",
"Bin",
"",
"Fudan University"
]
] | Assuming that dark energy may be treated as a fluid with a well defined temperature, close to equilibrium, we argue that if nowadays there is a transfer of energy between dark energy and dark matter, it must be such that the latter gains energy from the former and not the other way around. |
2210.15597 | Thomas Pappas | Thomas D. Pappas, Camilo Posada and Zden\v{e}k Stuchl\'ik | Extended Tolman III and VII solutions in $f(\mathcal{R},T)$ gravity:
Models for neutron stars and supermassive stars | 24 pages, 20 figures, 1 table, version to match the one published in
Phys. Rev. D, corrected issue of version 2 with figures appearing in the
references section | Phys. Rev. D 106 (2022) 12, 124014 | 10.1103/PhysRevD.106.124014 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of linear $f(\mathcal{R},T)=\mathcal{R}+\chi T$ gravity, where
$\mathcal{R}$ is the Ricci scalar, $T$ is the trace of the energy-momentum
tensor, and $\chi$ is a dimensionless parameter, we have obtained exact
analytical and numerical solutions for isotropic perfect-fluid spheres in
hydrostatic equilib... | [
{
"created": "Thu, 27 Oct 2022 16:37:25 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2023 15:58:33 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Jan 2023 15:50:28 GMT",
"version": "v3"
}
] | 2023-01-30 | [
[
"Pappas",
"Thomas D.",
""
],
[
"Posada",
"Camilo",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | In the context of linear $f(\mathcal{R},T)=\mathcal{R}+\chi T$ gravity, where $\mathcal{R}$ is the Ricci scalar, $T$ is the trace of the energy-momentum tensor, and $\chi$ is a dimensionless parameter, we have obtained exact analytical and numerical solutions for isotropic perfect-fluid spheres in hydrostatic equilibri... |
1503.08973 | Bibhas Majhi Ranjan | Bibhas Ranjan Majhi | Entropy function from the gravitational surface action for an extremal
near horizon black hole | Matches with the accepted version, to appear in EPJC | Eur.Phys.J. C75 (2015) 11, 521 | 10.1140/epjc/s10052-015-3744-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is often argued that {\it all the information of a gravitational theory is
encoded in the surface term of the action}; which means one can find several
physical quantities just from the surface term without incorporating the bulk
part of the action. This has been observed in various instances; e.g.
derivation of t... | [
{
"created": "Tue, 31 Mar 2015 09:17:39 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2015 12:45:15 GMT",
"version": "v2"
}
] | 2015-11-09 | [
[
"Majhi",
"Bibhas Ranjan",
""
]
] | It is often argued that {\it all the information of a gravitational theory is encoded in the surface term of the action}; which means one can find several physical quantities just from the surface term without incorporating the bulk part of the action. This has been observed in various instances; e.g. derivation of the... |
2007.02225 | Puxun Wu | Guoqiang Jin, Chengjie Fu, Puxun Wu, Hongwei Yu | Production of gravitational waves during preheating in the Starobinsky
inflationary model | 15 pages, 5 figures | Eur. Phys. J. C 80, 491 (2020) | 10.1140/epjc/s10052-020-8061-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of GWs during preheating in the Starobinsky model with a
nonminimally coupled auxiliary scalar field is studied through the lattice
simulation in this paper. We find that the GW spectrum $\Omega_{\rm gw}$ grows
fast with the increase of the absolute value of coupling parameter $\xi$. This
is because th... | [
{
"created": "Sun, 5 Jul 2020 02:09:06 GMT",
"version": "v1"
}
] | 2020-07-08 | [
[
"Jin",
"Guoqiang",
""
],
[
"Fu",
"Chengjie",
""
],
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
]
] | The production of GWs during preheating in the Starobinsky model with a nonminimally coupled auxiliary scalar field is studied through the lattice simulation in this paper. We find that the GW spectrum $\Omega_{\rm gw}$ grows fast with the increase of the absolute value of coupling parameter $\xi$. This is because the ... |
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