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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1808.02764 | Yuan K. Ha | Yuan K. Ha | Weighing the Black Hole via Quasi-local Energy | Editor invited paper. (12 pages). arXiv admin note: text overlap with
arXiv:1706.01768 | Mod. Phys. Lett. A, Vol. 32, No. 24 (2017) 1730021 | 10.1142/S021773231730021X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We set to weigh the black holes at their event horizons in various spacetimes
and obtain masses which are substantially higher than their asymptotic values.
In each case, the horizon mass of a Schwarzschild, Reissner-Nordstr{\"o}m, or
Kerr black hole is found to be twice the irreducible mass observed at infinity.
The... | [
{
"created": "Mon, 6 Aug 2018 20:25:31 GMT",
"version": "v1"
}
] | 2018-08-09 | [
[
"Ha",
"Yuan K.",
""
]
] | We set to weigh the black holes at their event horizons in various spacetimes and obtain masses which are substantially higher than their asymptotic values. In each case, the horizon mass of a Schwarzschild, Reissner-Nordstr{\"o}m, or Kerr black hole is found to be twice the irreducible mass observed at infinity. The i... |
1403.1507 | Brian Dolan | Brian P. Dolan | Thermodynamic stability of asymptotically anti-de Sitter rotating black
holes in higher dimensions | 30 pages, 3 figures. References added, minor typos corrected in v3 | null | 10.1088/0264-9381/31/16/165011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conditions for thermodynamic stability of asymptotically anti-de Sitter
rotating black holes in D-dimensions are determined. Local thermodynamic
stability requires not only positivity conditions on the specific heat and the
moment of inertia tensor but it is also necessary that the adiabatic
compressibility be positi... | [
{
"created": "Thu, 6 Mar 2014 17:43:34 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Apr 2014 14:46:07 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jul 2014 17:52:39 GMT",
"version": "v3"
}
] | 2015-06-19 | [
[
"Dolan",
"Brian P.",
""
]
] | Conditions for thermodynamic stability of asymptotically anti-de Sitter rotating black holes in D-dimensions are determined. Local thermodynamic stability requires not only positivity conditions on the specific heat and the moment of inertia tensor but it is also necessary that the adiabatic compressibility be positive... |
1605.02627 | Jeremy Neveu | J. Neveu, V. Ruhlmann-Kleider, P. Astier, M. Besan\c{c}on, J. Guy, A.
M\"oller, E. Babichev | Constraining the $\Lambda$CDM and Galileon models with recent
cosmological data | 22 pages, 17 figures, published version in A&A | A&A 600, A40 (2017) | 10.1051/0004-6361/201628878 | LPT-Orsay-16-45 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Galileon theory belongs to the class of modified gravity models that can
explain the late-time accelerated expansion of the Universe. In previous works,
cosmological constraints on the Galileon model were derived, both in the
uncoupled case and with a disformal coupling of the Galileon field to matter.
There, we ... | [
{
"created": "Mon, 9 May 2016 15:43:08 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2017 16:36:12 GMT",
"version": "v2"
}
] | 2017-03-29 | [
[
"Neveu",
"J.",
""
],
[
"Ruhlmann-Kleider",
"V.",
""
],
[
"Astier",
"P.",
""
],
[
"Besançon",
"M.",
""
],
[
"Guy",
"J.",
""
],
[
"Möller",
"A.",
""
],
[
"Babichev",
"E.",
""
]
] | The Galileon theory belongs to the class of modified gravity models that can explain the late-time accelerated expansion of the Universe. In previous works, cosmological constraints on the Galileon model were derived, both in the uncoupled case and with a disformal coupling of the Galileon field to matter. There, we sh... |
gr-qc/0703101 | Jose Socorro Garcia | C. Ortiz, E. Mena-Barboza, M. Sabido and J. Socorro | (Non)commutative isotropization in Bianchi I with Barotropic perfect
fluid and $\Lambda$ Cosmological | 15 pages, 1 figure | null | 10.1007/s10773-007-9557-1 | null | gr-qc | null | We present the classical solutions to the Einstein field equations derived
using the WKB-like and Hamilton procedures. The investigation is carried out in
the commutative and noncommutative scenario for the Bianchi type I cosmological
model coupled to barotropic perfect fluid and $\lambda $ Cosmological for two
diffe... | [
{
"created": "Tue, 20 Mar 2007 17:49:04 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Ortiz",
"C.",
""
],
[
"Mena-Barboza",
"E.",
""
],
[
"Sabido",
"M.",
""
],
[
"Socorro",
"J.",
""
]
] | We present the classical solutions to the Einstein field equations derived using the WKB-like and Hamilton procedures. The investigation is carried out in the commutative and noncommutative scenario for the Bianchi type I cosmological model coupled to barotropic perfect fluid and $\lambda $ Cosmological for two differe... |
2310.09558 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov | Can the energy of a particle be negative in the absence of external
fields? | 15 pages, 1 figure | Theor. Math. Phys. 216 (2023) 1337-1348 | 10.1134/S0040577923090088 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the question of conditions for the existence of negative-energy
states of particles in the absence of external fields in inertial and
noninertial frames of reference. We show that in the nonrelativistic case in
noninertial reference frames, there always exist domains where the energy of
particles is negative... | [
{
"created": "Sat, 14 Oct 2023 10:58:51 GMT",
"version": "v1"
}
] | 2023-10-17 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | We study the question of conditions for the existence of negative-energy states of particles in the absence of external fields in inertial and noninertial frames of reference. We show that in the nonrelativistic case in noninertial reference frames, there always exist domains where the energy of particles is negative. ... |
2205.13072 | Mahdi Godazgar | Oscar J. C. Dias, Mahdi Godazgar, Jorge E. Santos | Eigenvalue repulsions and quasinormal mode spectra of Kerr-Newman: an
extended study | 64 pages, 31 figures | null | 10.1007/JHEP07(2022)076 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | The frequency spectra of the gravito-electromagnetic perturbations of the
Kerr-Newman (KN) black hole with the slowest decay rate have been computed
recently. It has been found that KN has two families $-$ the photon sphere and
the near-horizon families $-$ of quasinormal modes (QNMs), which display the
interesting p... | [
{
"created": "Wed, 25 May 2022 22:38:33 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Dias",
"Oscar J. C.",
""
],
[
"Godazgar",
"Mahdi",
""
],
[
"Santos",
"Jorge E.",
""
]
] | The frequency spectra of the gravito-electromagnetic perturbations of the Kerr-Newman (KN) black hole with the slowest decay rate have been computed recently. It has been found that KN has two families $-$ the photon sphere and the near-horizon families $-$ of quasinormal modes (QNMs), which display the interesting phe... |
1611.06182 | Elena Kopteva | E. Kopteva, P. Jaluvkova, Z. Stuchlik | The generalized Lemaitre-Tolman-Bondi solutions with nonzero pressure in
modeling the cosmological black holes | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have obtained the set of new exact solutions of the Einstein
equations that generalize the known Lemaitre-Tolman-Bondi solution for the
certain case of nonzero pressure under zero spatial curvature. These solutions
are pretending to describe the black hole immersed in the nonstatic
cosmological backgr... | [
{
"created": "Fri, 18 Nov 2016 18:02:22 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2016 14:20:15 GMT",
"version": "v2"
}
] | 2016-11-29 | [
[
"Kopteva",
"E.",
""
],
[
"Jaluvkova",
"P.",
""
],
[
"Stuchlik",
"Z.",
""
]
] | In this work we have obtained the set of new exact solutions of the Einstein equations that generalize the known Lemaitre-Tolman-Bondi solution for the certain case of nonzero pressure under zero spatial curvature. These solutions are pretending to describe the black hole immersed in the nonstatic cosmological backgrou... |
2111.15660 | Jay Solanki | Jay Solanki | Gravitational collapse of compact stars in $ f(R) = \xi R^4 $ gravity | null | Int. J. Geom. Methods Mod. Phys. 19(02):2250021, 2022 | 10.1142/S0219887822500219 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Model of gravitational collapse of anisotropic compact stars in a new theory
of $ f(R) $ gravity has been developed. The author considers the modified
gravity model of $ f(R) = \xi R^4 $ to investigate a physically acceptable
model of gravitational collapse of anisotropic compact stars. First, the author
presents a b... | [
{
"created": "Thu, 25 Nov 2021 17:15:21 GMT",
"version": "v1"
}
] | 2022-04-01 | [
[
"Solanki",
"Jay",
""
]
] | Model of gravitational collapse of anisotropic compact stars in a new theory of $ f(R) $ gravity has been developed. The author considers the modified gravity model of $ f(R) = \xi R^4 $ to investigate a physically acceptable model of gravitational collapse of anisotropic compact stars. First, the author presents a bri... |
0903.3532 | Luis Herrera | L. Herrera, J. Ospino, A. Di Prisco, E. Fuenmayor and O. Troconis | Structure and evolution of self-gravitating objects and the orthogonal
splitting of the Riemann tensor | 32 pages, Latex | Phys.Rev.D79:064025,2009 | 10.1103/PhysRevD.79.064025 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The full set of equations governing the structure and the evolution of
self--gravitating spherically symmetric dissipative fluids with anisotropic
stresses, is written down in terms of five scalar quantities obtained from the
orthogonal splitting of the Riemann tensor, in the context of general
relativity. It is show... | [
{
"created": "Fri, 20 Mar 2009 15:04:12 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Herrera",
"L.",
""
],
[
"Ospino",
"J.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Fuenmayor",
"E.",
""
],
[
"Troconis",
"O.",
""
]
] | The full set of equations governing the structure and the evolution of self--gravitating spherically symmetric dissipative fluids with anisotropic stresses, is written down in terms of five scalar quantities obtained from the orthogonal splitting of the Riemann tensor, in the context of general relativity. It is shown ... |
0807.1324 | Holger Pletsch | Holger J. Pletsch | Parameter-space correlations of the optimal statistic for continuous
gravitational-wave detection | 17 pages, 10 figures | Phys.Rev.D78:102005,2008 | 10.1103/PhysRevD.78.102005 | LIGO-P080051-02-Z, AEI-2008-043 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The phase parameters of matched-filtering searches for continuous
gravitational-wave signals are sky position, frequency and frequency
time-derivatives. The space of these parameters features strong global
correlations in the optimal detection statistic. For observation times smaller
than one year, the orbital motion... | [
{
"created": "Wed, 9 Jul 2008 09:32:32 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2009 21:00:17 GMT",
"version": "v2"
}
] | 2009-05-19 | [
[
"Pletsch",
"Holger J.",
""
]
] | The phase parameters of matched-filtering searches for continuous gravitational-wave signals are sky position, frequency and frequency time-derivatives. The space of these parameters features strong global correlations in the optimal detection statistic. For observation times smaller than one year, the orbital motion o... |
1702.07766 | Farhad Darabi | Y. Heydarzade, F. Darabi | Black Hole Solutions Surrounded by Perfect Fluid in Rastall Theory | 15 Paes, 6 Tables | Physics Letters B, 771, (2017) 365-373 | 10.1016/j.physletb.2017.05.064 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we obtain uncharged\charged Kiselev-like black holes as a new
class of black hole solutions surrounded by perfect fluid in the context of
Rastall theory. Then, we study the specific cases of the uncharged\charged
black holes surrounded by regular matter like dust and radiation, or exotic
matter like qui... | [
{
"created": "Fri, 24 Feb 2017 21:13:23 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jun 2017 20:47:53 GMT",
"version": "v2"
}
] | 2017-06-09 | [
[
"Heydarzade",
"Y.",
""
],
[
"Darabi",
"F.",
""
]
] | In this work, we obtain uncharged\charged Kiselev-like black holes as a new class of black hole solutions surrounded by perfect fluid in the context of Rastall theory. Then, we study the specific cases of the uncharged\charged black holes surrounded by regular matter like dust and radiation, or exotic matter like quint... |
2008.12932 | Sebastian Khan | Sebastian Khan, Rhys Green | Gravitational-wave surrogate models powered by artificial neural
networks: The ANN-Sur for waveform generation | null | Phys. Rev. D 103, 064015 (2021) | 10.1103/PhysRevD.103.064015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inferring the properties of black holes and neutron stars is a key science
goal of gravitational-wave (GW) astronomy. To extract as much information as
possible from GW observations we must develop methods to reduce the cost of
Bayesian inference. In this paper, we use artificial neural networks (ANNs) and
the parall... | [
{
"created": "Sat, 29 Aug 2020 07:54:58 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2020 10:23:43 GMT",
"version": "v2"
}
] | 2021-03-17 | [
[
"Khan",
"Sebastian",
""
],
[
"Green",
"Rhys",
""
]
] | Inferring the properties of black holes and neutron stars is a key science goal of gravitational-wave (GW) astronomy. To extract as much information as possible from GW observations we must develop methods to reduce the cost of Bayesian inference. In this paper, we use artificial neural networks (ANNs) and the parallel... |
1602.03309 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Singular $F(R)$ Cosmology Unifying Early and Late-time Acceleration with
Matter and Radiation Domination Era | CQG accepted | null | 10.1088/0264-9381/33/12/125029 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present some cosmological models which unify the late and early-time
acceleration eras with the radiation and the matter domination era, and we
realize the cosmological models by using the theoretical framework of $F(R)$
gravity. Particularly, the first model unifies the late and early-time
acceleration with the m... | [
{
"created": "Wed, 10 Feb 2016 09:45:57 GMT",
"version": "v1"
},
{
"created": "Sat, 14 May 2016 10:04:12 GMT",
"version": "v2"
}
] | 2016-06-01 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | We present some cosmological models which unify the late and early-time acceleration eras with the radiation and the matter domination era, and we realize the cosmological models by using the theoretical framework of $F(R)$ gravity. Particularly, the first model unifies the late and early-time acceleration with the mat... |
1011.2463 | Madhavan Varadarajan | Alok Laddha and Madhavan Varadarajan | The Hamiltonian constraint in Polymer Parametrized Field Theory | 53 pages | Phys.Rev.D83:025019,2011 | 10.1103/PhysRevD.83.025019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a generally covariant reformulation of 2 dimensional flat spacetime
free scalar field theory known as Parameterised Field Theory was quantized
using Loop Quantum Gravity (LQG) type `polymer' representations. Physical
states were constructed, without intermediate regularization structures, by
averaging over ... | [
{
"created": "Wed, 10 Nov 2010 19:30:06 GMT",
"version": "v1"
}
] | 2015-01-30 | [
[
"Laddha",
"Alok",
""
],
[
"Varadarajan",
"Madhavan",
""
]
] | Recently, a generally covariant reformulation of 2 dimensional flat spacetime free scalar field theory known as Parameterised Field Theory was quantized using Loop Quantum Gravity (LQG) type `polymer' representations. Physical states were constructed, without intermediate regularization structures, by averaging over th... |
2405.02879 | Hossein Khodabakhshi | H. Khodabakhshi, M. Farhang, F. Shojai, H. L\"u | Cosmology with Higher-Derivative Gravities | 9 pages, 1 table | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-sa/4.0/ | We introduce an ingenious approach to explore cosmological implications of
higher-derivative gravity theories. The key novelty lies in the
characterization of the additional massive spin-0 modes constructed from Hubble
derivatives as an effective density, with the corresponding pressure uniquely
determined by energy ... | [
{
"created": "Sun, 5 May 2024 10:25:18 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2024 05:18:18 GMT",
"version": "v2"
}
] | 2024-05-15 | [
[
"Khodabakhshi",
"H.",
""
],
[
"Farhang",
"M.",
""
],
[
"Shojai",
"F.",
""
],
[
"Lü",
"H.",
""
]
] | We introduce an ingenious approach to explore cosmological implications of higher-derivative gravity theories. The key novelty lies in the characterization of the additional massive spin-0 modes constructed from Hubble derivatives as an effective density, with the corresponding pressure uniquely determined by energy co... |
1105.1996 | Stefan Hollands | Stefan Hollands | Massless interacting quantum fields in deSitter spacetime | 40 pages, several figures, v2: added references, more discussion in
app.C and in proof of thm.1, other minor changes | null | 10.1007/s00023-011-0140-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize key aspects of arXiv:1010.5367 (and also arXiv:1010.5327) to
the case of {\em massless} $\lambda \phi^{2n}$ quantum field theory on deSitter
spacetime. As in that paper, our key objective is to derive a suitable
"Mellin-Barnes-type" representation of deSitter correlation functions in a
deSitter-invarian... | [
{
"created": "Tue, 10 May 2011 16:54:11 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2011 12:08:10 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Hollands",
"Stefan",
""
]
] | We generalize key aspects of arXiv:1010.5367 (and also arXiv:1010.5327) to the case of {\em massless} $\lambda \phi^{2n}$ quantum field theory on deSitter spacetime. As in that paper, our key objective is to derive a suitable "Mellin-Barnes-type" representation of deSitter correlation functions in a deSitter-invariant ... |
1910.14044 | Christian Pfeifer | Manuel Hohmann, Christian Pfeifer, Nicoleta Voicu | Relativistic kinetic gases as direct sources of gravity | 13 pages, updated to journal version | Phys. Rev. D 101, 024062 (2020) | 10.1103/PhysRevD.101.024062 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new model for the description of a gravitating multi particle
system, viewed as a kinetic gas. The properties of the, colliding or
non-colliding, particles are encoded into a so called one-particle distribution
function, which is a density on the space of allowed particle positions and
velocities, i.e. o... | [
{
"created": "Wed, 30 Oct 2019 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Feb 2020 11:36:45 GMT",
"version": "v2"
}
] | 2020-02-11 | [
[
"Hohmann",
"Manuel",
""
],
[
"Pfeifer",
"Christian",
""
],
[
"Voicu",
"Nicoleta",
""
]
] | We propose a new model for the description of a gravitating multi particle system, viewed as a kinetic gas. The properties of the, colliding or non-colliding, particles are encoded into a so called one-particle distribution function, which is a density on the space of allowed particle positions and velocities, i.e. on ... |
0905.4564 | Josep M. Pons | J. M. Pons, D. C. Salisbury, K. A. Sundermeyer | Revisiting observables in generally covariant theories in the light of
gauge fixing methods | 24 pages. New paragraph in conclusions and references added. To
appear in Physical Review D | Phys.Rev.D80:084015,2009 | 10.1103/PhysRevD.80.084015 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive for generally covariant theories the generic dependency of
observables on the original fields, corresponding to coordinate-dependent gauge
fixings. This gauge choice is equivalent to a choice of intrinsically defined
coordinates accomplished with the aid of spacetime scalar fields. With our
approach we make... | [
{
"created": "Thu, 28 May 2009 06:59:47 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Oct 2009 14:41:36 GMT",
"version": "v2"
}
] | 2009-10-29 | [
[
"Pons",
"J. M.",
""
],
[
"Salisbury",
"D. C.",
""
],
[
"Sundermeyer",
"K. A.",
""
]
] | We derive for generally covariant theories the generic dependency of observables on the original fields, corresponding to coordinate-dependent gauge fixings. This gauge choice is equivalent to a choice of intrinsically defined coordinates accomplished with the aid of spacetime scalar fields. With our approach we make f... |
gr-qc/9311019 | Jesus Barbero | J. Fernando Barbero | A Real Polynomial Formulation of General Relativity in terms of
Connections | 13 pages, LATEX, Preprint CGPG-93/11-3 | Phys.Rev.D49:6935-6938,1994 | 10.1103/PhysRevD.49.6935 | null | gr-qc | null | I show in this letter that it is possible to construct a Hamiltonian
description for Lorentzian General Relativity in terms of two real $SO(3)$
connections. The constraints are simple polynomials in the basic variables. The
present framework gives us a new formulation of General Relativity that keeps
some of the inte... | [
{
"created": "Thu, 11 Nov 1993 19:34:27 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Barbero",
"J. Fernando",
""
]
] | I show in this letter that it is possible to construct a Hamiltonian description for Lorentzian General Relativity in terms of two real $SO(3)$ connections. The constraints are simple polynomials in the basic variables. The present framework gives us a new formulation of General Relativity that keeps some of the intere... |
1503.04556 | Alberto Balfagon | Alberto C. Balfagon | Accelerated Expansion of the universe based on Particle
Creation-Destruction Processes and Dark Energy in FLRW universes | 11 pages, 2 figures | Gen. Relativ. Gravit. (2015) 47:111 issue 10 - October 2015 | 10.1007/s10714-015-1954-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Particle creation has been considered as a possible justification for the
accelerated expansion of the universe, obeying the second law of
thermodynamics, together with the possible existence of Dark Energy. This paper
introduces the possibility that the destruction of baryonic and/or dark matter
particles also verif... | [
{
"created": "Mon, 16 Mar 2015 08:07:57 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2015 06:29:59 GMT",
"version": "v2"
}
] | 2015-10-05 | [
[
"Balfagon",
"Alberto C.",
""
]
] | Particle creation has been considered as a possible justification for the accelerated expansion of the universe, obeying the second law of thermodynamics, together with the possible existence of Dark Energy. This paper introduces the possibility that the destruction of baryonic and/or dark matter particles also verifie... |
1911.02828 | Carles Bona | Carles Bona | The horizon problem as a clue: a smooth big bang? | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The necessary and sufficient condition for the absence of particle horizons
in a big bang Friedmann-Robertson-Walker universe is provided. It happens to be
a "smooth big bang" initial condition: the proper time derivative of the
expansion factor $a(t)$ must be finite at the big bang. Equivalently, the
energy density ... | [
{
"created": "Thu, 7 Nov 2019 10:19:05 GMT",
"version": "v1"
}
] | 2019-11-11 | [
[
"Bona",
"Carles",
""
]
] | The necessary and sufficient condition for the absence of particle horizons in a big bang Friedmann-Robertson-Walker universe is provided. It happens to be a "smooth big bang" initial condition: the proper time derivative of the expansion factor $a(t)$ must be finite at the big bang. Equivalently, the energy density mu... |
gr-qc/9402045 | Peter Boschung | P. Boschung, O. Brodbeck, F. Moser, N. Straumann and M. Volkov | Instability of Gravitating Sphalerons | replaced mainly due to LaTex problems', 11p, Latex, ZU-TH 7-94 | Phys.Rev. D50 (1994) 3842-3846 | 10.1103/PhysRevD.50.3842 | null | gr-qc hep-th | null | We prove the instability of the gravitating regular sphaleron solutions of
the $SU(2)$ Einstein-Yang-Mills-Higgs system with a Higgs doublet, by studying
the frequency spectrum of a class of radial perturbations. With the help of a
variational principle we show that there exist always unstable modes. Our
method has t... | [
{
"created": "Mon, 28 Feb 1994 15:34:03 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 1994 10:52:21 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Boschung",
"P.",
""
],
[
"Brodbeck",
"O.",
""
],
[
"Moser",
"F.",
""
],
[
"Straumann",
"N.",
""
],
[
"Volkov",
"M.",
""
]
] | We prove the instability of the gravitating regular sphaleron solutions of the $SU(2)$ Einstein-Yang-Mills-Higgs system with a Higgs doublet, by studying the frequency spectrum of a class of radial perturbations. With the help of a variational principle we show that there exist always unstable modes. Our method has the... |
1901.03055 | Amir Hadi Ziaie | A. H. Ziaie, H. Moradpour and S. Ghaffari | Gravitational Collapse in Rastall Gravity | 6 pages and 1 figure | Physics Letters B 793 (2019) 276 | 10.1016/j.physletb.2019.04.055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study spherically symmetric gravitational collapse of a homogeneous
perfect fluid in Rastall gravity. Considering a linear equation of state (EoS)
for the fluid profiles, we examine the conditions under which the collapse
scenario could end in a spacetime singularity. Depending on the model
parameters, the singula... | [
{
"created": "Thu, 10 Jan 2019 08:42:07 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2019 18:57:14 GMT",
"version": "v2"
}
] | 2019-05-08 | [
[
"Ziaie",
"A. H.",
""
],
[
"Moradpour",
"H.",
""
],
[
"Ghaffari",
"S.",
""
]
] | We study spherically symmetric gravitational collapse of a homogeneous perfect fluid in Rastall gravity. Considering a linear equation of state (EoS) for the fluid profiles, we examine the conditions under which the collapse scenario could end in a spacetime singularity. Depending on the model parameters, the singulari... |
1905.01231 | Igor Khavkine | Alfonso Garc\'ia-Parrado, Igor Khavkine | Conformal Killing Initial Data | v1: 12 pages; v2: 22 pages, major reorganization, main results in
previous version were incomplete | J Math Phys 60, 122502 (2019) | 10.1063/1.5126683 | null | gr-qc math-ph math.DG math.MP | http://creativecommons.org/licenses/by/4.0/ | We find necessary and sufficient conditions ensuring that the vacuum
development of an initial data set of the Einstein's field equations admits a
conformal Killing vector. We refer to these conditions as conformal Killing
initial data (CKID) and they extend the well-known Killing initial data (KID)
that have been kn... | [
{
"created": "Fri, 3 May 2019 15:39:37 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Sep 2019 04:29:28 GMT",
"version": "v2"
}
] | 2019-12-24 | [
[
"García-Parrado",
"Alfonso",
""
],
[
"Khavkine",
"Igor",
""
]
] | We find necessary and sufficient conditions ensuring that the vacuum development of an initial data set of the Einstein's field equations admits a conformal Killing vector. We refer to these conditions as conformal Killing initial data (CKID) and they extend the well-known Killing initial data (KID) that have been know... |
0902.2531 | Florian Beyer | Florian Beyer | Non-genericity of the Nariai solutions: I. Asymptotics and spatially
homogeneous perturbations | 22 pages, 2 figures, uses psfrag and hyperref, largely rewritten
version essentially equal to the published version but more details, no
change of conclusions | Class.Quant.Grav.26:235015 | 10.1088/0264-9381/26/23/235015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the first of two papers where we study the asymptotics of the
generalized Nariai solutions and its relation to the cosmic no-hair conjecture.
According to the cosmic no-hair conjecture, generic expanding solutions of
Einstein's field equations in vacuum with a positive cosmological constant
isotropize and app... | [
{
"created": "Sun, 15 Feb 2009 09:48:08 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Nov 2009 04:36:14 GMT",
"version": "v2"
}
] | 2011-03-28 | [
[
"Beyer",
"Florian",
""
]
] | This is the first of two papers where we study the asymptotics of the generalized Nariai solutions and its relation to the cosmic no-hair conjecture. According to the cosmic no-hair conjecture, generic expanding solutions of Einstein's field equations in vacuum with a positive cosmological constant isotropize and appro... |
0905.2719 | Farook Rahaman | Farook Rahaman, Mubasher Jamil, Ashis Ghosh and Kausik Chakraborty | On generating some known black hole solutions | 11 pages, Some sections are extended and several references are
added, Accepted for publication in Mod.Phys.Lett.A | Mod.Phys.Lett.A25:835-842,2010 | 10.1142/S0217732310031440 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have presented an algorithm to generate various black hole
solutions in general relativity and alternative theories of gravity. The
algorithm involves few dimensional parameters that are assigned suitable values
to specify the required black hole.
| [
{
"created": "Sun, 17 May 2009 07:13:21 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 2009 18:28:58 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jun 2009 15:46:06 GMT",
"version": "v3"
},
{
"created": "Mon, 3 Aug 2009 18:01:48 GMT",
"version": "v4"
}
] | 2010-04-28 | [
[
"Rahaman",
"Farook",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Ghosh",
"Ashis",
""
],
[
"Chakraborty",
"Kausik",
""
]
] | In this paper, we have presented an algorithm to generate various black hole solutions in general relativity and alternative theories of gravity. The algorithm involves few dimensional parameters that are assigned suitable values to specify the required black hole. |
1006.3274 | Albert Roura | E. T. Akhmedov, Albert Roura, A. Sadofyev | Classical radiation by free-falling charges in de Sitter spacetime | 31 pages, REVTeX4, minor changes, one reference added, version to
appear in Phys. Rev. D | Phys.Rev.D82:044035,2010 | 10.1103/PhysRevD.82.044035 | AEI-2010-114 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical radiation emitted by free-falling charges in de Sitter
spacetime coupled to different kinds of fields. Specifically we consider the
cases of the electromagnetic field, linearized gravity and scalar fields with
arbitrary mass and curvature coupling. Given an arbitrary set of such charges,
there ... | [
{
"created": "Wed, 16 Jun 2010 17:11:39 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Aug 2010 15:49:59 GMT",
"version": "v2"
}
] | 2010-10-11 | [
[
"Akhmedov",
"E. T.",
""
],
[
"Roura",
"Albert",
""
],
[
"Sadofyev",
"A.",
""
]
] | We study the classical radiation emitted by free-falling charges in de Sitter spacetime coupled to different kinds of fields. Specifically we consider the cases of the electromagnetic field, linearized gravity and scalar fields with arbitrary mass and curvature coupling. Given an arbitrary set of such charges, there is... |
2007.06089 | J. Robel Arenas | Fernando Castro and J. Robel Arenas | Hawking Radiation of Black Shells | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A black shell consists of a massive thin spherical shell contracting toward
its gravitational radius, coinciding with 't Hooft's brick wall, from the point
of view of an external observer far from the shell. This object was conceived
by J.R.Arenas and W.Israel in order to effectively model the gravitational
collapse ... | [
{
"created": "Sun, 12 Jul 2020 20:27:51 GMT",
"version": "v1"
}
] | 2020-07-14 | [
[
"Castro",
"Fernando",
""
],
[
"Arenas",
"J. Robel",
""
]
] | A black shell consists of a massive thin spherical shell contracting toward its gravitational radius, coinciding with 't Hooft's brick wall, from the point of view of an external observer far from the shell. This object was conceived by J.R.Arenas and W.Israel in order to effectively model the gravitational collapse dy... |
2101.00714 | Benjamin J. Owen | Binod Rajbhandari, Benjamin J. Owen, Santiago Caride, and Ra Inta | First searches for gravitational waves from r-modes of the Crab pulsar | 6 pages, 2 figures | null | 10.1103/PhysRevD.104.122008 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We present the first searches for gravitational waves from r-modes of the
Crab pulsar, coherently and separately integrating data from three stretches of
the first two observing runs of Advanced LIGO using the F-statistic. The second
run was divided in two by a glitch of the pulsar roughly halfway through. The
freque... | [
{
"created": "Sun, 3 Jan 2021 22:19:02 GMT",
"version": "v1"
}
] | 2022-01-12 | [
[
"Rajbhandari",
"Binod",
""
],
[
"Owen",
"Benjamin J.",
""
],
[
"Caride",
"Santiago",
""
],
[
"Inta",
"Ra",
""
]
] | We present the first searches for gravitational waves from r-modes of the Crab pulsar, coherently and separately integrating data from three stretches of the first two observing runs of Advanced LIGO using the F-statistic. The second run was divided in two by a glitch of the pulsar roughly halfway through. The frequenc... |
1511.08382 | Petros Terzis A. | Adamantia Zampeli, Theodoros Pailas, Petros A. Terzis, T.
Christodoulakis | Conditional symmetries in axisymmetric quantum cosmologies with scalar
fields and the fate of the classical singularities | 29 pages, LaTeX2e source file, no figures; v2 References and a new
appendix added. Typo in title corected. Matches accepted version in JCAP | JCAP 05 (2016) 066 | 10.1088/1475-7516/2016/05/066 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the classical and quantum solutions of some axisymmetric
cosmologies coupled to a massless scalar field are studied in the context of
minisuperspace approximation. In these models, the singular nature of the
Lagrangians entails a search for possible conditional symmetries. These have
been proven to be ... | [
{
"created": "Thu, 26 Nov 2015 13:21:22 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2016 14:40:37 GMT",
"version": "v2"
}
] | 2016-06-03 | [
[
"Zampeli",
"Adamantia",
""
],
[
"Pailas",
"Theodoros",
""
],
[
"Terzis",
"Petros A.",
""
],
[
"Christodoulakis",
"T.",
""
]
] | In this paper, the classical and quantum solutions of some axisymmetric cosmologies coupled to a massless scalar field are studied in the context of minisuperspace approximation. In these models, the singular nature of the Lagrangians entails a search for possible conditional symmetries. These have been proven to be th... |
1511.08665 | Alessandro Pesci | Alessandro Pesci | Spacetime atoms and extrinsic curvature of equi-geodesic surfaces | 7 pages; some editing, it matches the published version | Eur. Phys. J. Plus 134 (2019) 374 | 10.1140/epjp/i2019-12749-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recently-introduced function $\rho$ of spacetime event $P$ expressing
spacetime as made of 'spacetime atoms' of quantum origin is considered. Using
its defining relation, we provide an exact expression for $\rho$ involving the
van Vleck biscalar, and show it can be recast in terms of the extrinsic
curvature of suit... | [
{
"created": "Fri, 27 Nov 2015 13:32:38 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2016 15:16:16 GMT",
"version": "v2"
},
{
"created": "Fri, 20 May 2016 12:10:00 GMT",
"version": "v3"
},
{
"created": "Tue, 30 Jan 2018 07:37:12 GMT",
"version": "v4"
},
{
"c... | 2019-08-01 | [
[
"Pesci",
"Alessandro",
""
]
] | A recently-introduced function $\rho$ of spacetime event $P$ expressing spacetime as made of 'spacetime atoms' of quantum origin is considered. Using its defining relation, we provide an exact expression for $\rho$ involving the van Vleck biscalar, and show it can be recast in terms of the extrinsic curvature of suitab... |
1701.00431 | Jonas Pedro Pereira | Herman J. Mosquera Cuesta, Gaetano Lambiase, Jonas P. Pereira | Probing nonlinear electrodynamics in slowly rotating spacetimes through
neutrino astrophysics | 17 pages, 9 figures, accepted for publication in Phys. Rev. D | Phys. Rev. D 95, 025011 (2017) | 10.1103/PhysRevD.95.025011 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Huge electromagnetic fields are known to be present during the late stages of
the dynamics of supernovae. Thus, when dealing with electrodynamics in this
context, the possibility may arise to probe nonlinear theories (generalizations
of the Maxwellian electromagnetism). We firstly solve Einstein field equations
minim... | [
{
"created": "Mon, 2 Jan 2017 15:58:38 GMT",
"version": "v1"
}
] | 2017-01-25 | [
[
"Cuesta",
"Herman J. Mosquera",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Pereira",
"Jonas P.",
""
]
] | Huge electromagnetic fields are known to be present during the late stages of the dynamics of supernovae. Thus, when dealing with electrodynamics in this context, the possibility may arise to probe nonlinear theories (generalizations of the Maxwellian electromagnetism). We firstly solve Einstein field equations minimal... |
1506.08297 | Morgan Le Delliou | J. Lorca Espiro, Morgan Le Delliou (IFT-UNESP) | A topological origin for Dark Energy | The problem presented is ill-defined and therefore the solutions are
not consistent as claimed. First, the variational problem is not redefined
after the characteristic classes are added into the action, which is
necessary. Secondly, the paper assumes certain restrictions over the
contortion that forces the top... | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmology struggles with the theoretical problems generated by the observed
value and recent emergence of a cosmological constant, in the standard model of
cosmology, i.e. the concordance model. We propose to provide a more natural
explanation for its value than the conventional quantum vacuum energy in the
guise of ... | [
{
"created": "Sat, 27 Jun 2015 14:37:23 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2019 03:38:50 GMT",
"version": "v2"
}
] | 2019-05-08 | [
[
"Espiro",
"J. Lorca",
"",
"IFT-UNESP"
],
[
"Delliou",
"Morgan Le",
"",
"IFT-UNESP"
]
] | Cosmology struggles with the theoretical problems generated by the observed value and recent emergence of a cosmological constant, in the standard model of cosmology, i.e. the concordance model. We propose to provide a more natural explanation for its value than the conventional quantum vacuum energy in the guise of to... |
1207.4812 | Gonzalo Olmo | Gonzalo J. Olmo | Birkhoff's theorem and perturbations in $f(R)$ theories | 2 pages, 1 figure | Annalen Phys. 524 (2012) 87-88 | 10.1002/andp.201200721 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Invited contribution to Annalen der Physik (Expert Opinion).
| [
{
"created": "Thu, 19 Jul 2012 21:18:39 GMT",
"version": "v1"
}
] | 2012-07-23 | [
[
"Olmo",
"Gonzalo J.",
""
]
] | Invited contribution to Annalen der Physik (Expert Opinion). |
2212.02026 | Sunil Choudhary | Sunil Choudhary, Sukanta Bose, Prasanna Joshi, Sanjeev Dhurandhar | Improved binary black hole searches through better discrimination
against noise transients | 12pages, 6 figures | null | null | LIGO-DCC-P2200288 | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The short-duration noise transients in LIGO and Virgo detectors significantly
affect the search sensitivity of compact binary coalescence (CBC) signals,
especially in the high mass region. In the previous work by the authors
\cite{Joshi_2021}, a $\chi^2$ statistic was proposed to distinguish them from
CBCs. This work... | [
{
"created": "Mon, 5 Dec 2022 04:46:19 GMT",
"version": "v1"
}
] | 2022-12-06 | [
[
"Choudhary",
"Sunil",
""
],
[
"Bose",
"Sukanta",
""
],
[
"Joshi",
"Prasanna",
""
],
[
"Dhurandhar",
"Sanjeev",
""
]
] | The short-duration noise transients in LIGO and Virgo detectors significantly affect the search sensitivity of compact binary coalescence (CBC) signals, especially in the high mass region. In the previous work by the authors \cite{Joshi_2021}, a $\chi^2$ statistic was proposed to distinguish them from CBCs. This work i... |
gr-qc/0102038 | Thomas Thiemann | H. Sahlmann, T. Thiemann, O. Winkler | Coherent States for Canonical Quantum General Relativity and the
Infinite Tensor Product Extension | 37 p., latex2e, no figures | Nucl.Phys. B606 (2001) 401-440 | 10.1016/S0550-3213(01)00226-7 | AEI-2001-011 | gr-qc hep-lat hep-th quant-ph | null | We summarize a recently proposed concrete programme for investigating the
(semi)classical limit of canonical, Lorentzian, continuum quantum general
relativity in four spacetime dimensions. The analysis is based on a novel set
of coherent states labelled by graphs. These fit neatly together with an
Infinite Tensor Pro... | [
{
"created": "Fri, 9 Feb 2001 14:03:15 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sahlmann",
"H.",
""
],
[
"Thiemann",
"T.",
""
],
[
"Winkler",
"O.",
""
]
] | We summarize a recently proposed concrete programme for investigating the (semi)classical limit of canonical, Lorentzian, continuum quantum general relativity in four spacetime dimensions. The analysis is based on a novel set of coherent states labelled by graphs. These fit neatly together with an Infinite Tensor Produ... |
1709.09792 | J\"org Hennig | J\"org Frauendiener and J\"org Hennig | Fully pseudospectral solution of the conformally invariant wave equation
near the cylinder at spacelike infinity. III: Nonspherical Schwarzschild
waves and singularities at null infinity | 20 pages, 5 figures | Class. Quantum Grav. 35, 065015 (2018) | 10.1088/1361-6382/aaac8d | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend earlier numerical and analytical considerations of the conformally
invariant wave equation on a Schwarzschild background from the case of
spherically symmetric solutions, discussed in Class. Quantum Grav. 34, 045005
(2017), to the case of general, nonsymmetric solutions. A key element of our
approach is the... | [
{
"created": "Thu, 28 Sep 2017 03:33:43 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 2018 20:34:01 GMT",
"version": "v2"
}
] | 2018-02-23 | [
[
"Frauendiener",
"Jörg",
""
],
[
"Hennig",
"Jörg",
""
]
] | We extend earlier numerical and analytical considerations of the conformally invariant wave equation on a Schwarzschild background from the case of spherically symmetric solutions, discussed in Class. Quantum Grav. 34, 045005 (2017), to the case of general, nonsymmetric solutions. A key element of our approach is the m... |
1804.00070 | Craig J. Hogan | Craig Hogan | Value of the Cosmological Constant in Emergent Quantum Gravity | Essay written for the Gravity Research Foundation 2018 Awards for
Essays on Gravitation | null | null | FERMILAB-PUB-18-088-A | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is suggested that the exact value of the cosmological constant could be
derived from first principles, based on entanglement of the Standard Model
field vacuum with emergent holographic quantum geometry. For the observed value
of the cosmological constant, geometrical information is shown to agree closely
with the... | [
{
"created": "Fri, 30 Mar 2018 22:17:04 GMT",
"version": "v1"
}
] | 2018-04-03 | [
[
"Hogan",
"Craig",
""
]
] | It is suggested that the exact value of the cosmological constant could be derived from first principles, based on entanglement of the Standard Model field vacuum with emergent holographic quantum geometry. For the observed value of the cosmological constant, geometrical information is shown to agree closely with the s... |
gr-qc/0601072 | Alicia M. Sintes | Manuel Luna and Alicia M. Sintes | Parameter estimation of compact binaries using the inspiral and ringdown
waveforms | matching cqg version | Class.Quant.Grav. 23 (2006) 3763-3782 | 10.1088/0264-9381/23/11/006 | null | gr-qc | null | We analyze the problem of parameter estimation for compact binary systems
that could be detected by ground-based gravitational wave detectors.
So far this problem has only been dealt with for the inspiral and the
ringdown phases separately. In this paper, we combine the information from both
signals, and we study t... | [
{
"created": "Wed, 18 Jan 2006 11:26:39 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2006 16:38:23 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Luna",
"Manuel",
""
],
[
"Sintes",
"Alicia M.",
""
]
] | We analyze the problem of parameter estimation for compact binary systems that could be detected by ground-based gravitational wave detectors. So far this problem has only been dealt with for the inspiral and the ringdown phases separately. In this paper, we combine the information from both signals, and we study the i... |
1412.2285 | Shahn Majid | Shahn Majid and Wen-Qing Tao | Cosmological constant from quantum spacetime | 13 pages latex no figures. Compared to version 1, we put in the
correct name `Bertotti-Robinson' and its context | null | null | null | gr-qc hep-th math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a hypothesis that spacetime is quantum with coordinate algebra
$[x^i,t]=\lambda_P x^i$, and spherical symmetry under rotations of the $x^i$,
essentially requires in the classical limit that the spacetime metric is the
Bertotti-Robinson metric, i.e. a solution of Einstein's equations with
cosmological con... | [
{
"created": "Sat, 6 Dec 2014 21:34:31 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2014 13:32:43 GMT",
"version": "v2"
}
] | 2014-12-16 | [
[
"Majid",
"Shahn",
""
],
[
"Tao",
"Wen-Qing",
""
]
] | We show that a hypothesis that spacetime is quantum with coordinate algebra $[x^i,t]=\lambda_P x^i$, and spherical symmetry under rotations of the $x^i$, essentially requires in the classical limit that the spacetime metric is the Bertotti-Robinson metric, i.e. a solution of Einstein's equations with cosmological const... |
gr-qc/0505091 | Fabrizio Canfora | F. Canfora, G. Vilasi | The Holographic Principle and the Early Universe | Revised version to be pubblished on Physics Letters B: a reference,
which provides the results of the paper with further supports, has been
added; typos have been corrected; 11 pages no figures | Phys.Lett. B625 (2005) 171-176 | 10.1016/j.physletb.2005.08.079 | null | gr-qc astro-ph hep-ph hep-th | null | A scenario is proposed in which the matter-antimatter asymmetry behaves like
a seed for the inflationary phase of the universe. The mechanism which makes
this scenario plausible is the holographic principle: this scheme is supported
by a good prediction of the number of e-folds. It seems that such a mechanism
can onl... | [
{
"created": "Wed, 18 May 2005 07:49:46 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Aug 2005 14:49:33 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Canfora",
"F.",
""
],
[
"Vilasi",
"G.",
""
]
] | A scenario is proposed in which the matter-antimatter asymmetry behaves like a seed for the inflationary phase of the universe. The mechanism which makes this scenario plausible is the holographic principle: this scheme is supported by a good prediction of the number of e-folds. It seems that such a mechanism can only ... |
1512.02422 | Amitabh Virmani | Soumyabrata Chatterjee, Suman Ganguli, and Amitabh Virmani | Charged Vaidya Solution Satisfies Weak Energy Condition | 21 pages; 1 LaTeX figure; v2 refs added, journal version | General Relativity and Gravitation, 48(7), 1-22, 2016 | 10.1007/s10714-016-2089-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The external matter stress-tensor supporting charged Vaidya solution appears
to violate weak energy condition in certain region of the spacetime. Motivated
by this, a new interpretation of charged Vaidya solution was proposed by Ori
[1] in which the energy condition continues to be satisfied. In this
construction, on... | [
{
"created": "Tue, 8 Dec 2015 12:21:15 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2016 10:58:10 GMT",
"version": "v2"
}
] | 2016-06-21 | [
[
"Chatterjee",
"Soumyabrata",
""
],
[
"Ganguli",
"Suman",
""
],
[
"Virmani",
"Amitabh",
""
]
] | The external matter stress-tensor supporting charged Vaidya solution appears to violate weak energy condition in certain region of the spacetime. Motivated by this, a new interpretation of charged Vaidya solution was proposed by Ori [1] in which the energy condition continues to be satisfied. In this construction, one ... |
1707.04222 | James Weatherall | Robert Geroch and James Owen Weatherall | The Motion of Small Bodies in Space-time | 30 pages, forthcoming in Communications in Mathematical Physics | null | 10.1007/s00220-018-3268-8 | null | gr-qc math-ph math.AP math.DG math.MP physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the motion of small bodies in general relativity. The key result
captures a sense in which such bodies follow timelike geodesics (or, in the
case of charged bodies, Lorentz-force curves). This result clarifies the
relationship between approaches that model such bodies as distributions
supported on a curve... | [
{
"created": "Thu, 13 Jul 2017 16:53:42 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2018 13:19:27 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"Geroch",
"Robert",
""
],
[
"Weatherall",
"James Owen",
""
]
] | We consider the motion of small bodies in general relativity. The key result captures a sense in which such bodies follow timelike geodesics (or, in the case of charged bodies, Lorentz-force curves). This result clarifies the relationship between approaches that model such bodies as distributions supported on a curve, ... |
1601.03143 | Saheb Soroushfar | Saheb Soroushfar, Reza Saffari, Ehsan Sahami | Geodesic equations in the static and rotating dilaton black holes:
Analytical solutions and applications | 29 figures, 4 tables, 35 pages | Phys. Rev. D 94, 024010 (2016) | 10.1103/PhysRevD.94.024010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the timelike and null geodesics around the static
[GMGHS (Gibbons, Maeda, Garfinkle, Horowitz and Strominger), magnetically
charged GMGHS, electrically charged GMGHS] and the rotating (Kerr-Sen
dilaton-axion) dilaton black holes. The geodesic equations are solved in terms
of Weierstrass ell... | [
{
"created": "Wed, 13 Jan 2016 06:54:56 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2016 08:19:05 GMT",
"version": "v2"
}
] | 2016-07-21 | [
[
"Soroushfar",
"Saheb",
""
],
[
"Saffari",
"Reza",
""
],
[
"Sahami",
"Ehsan",
""
]
] | In this paper, we consider the timelike and null geodesics around the static [GMGHS (Gibbons, Maeda, Garfinkle, Horowitz and Strominger), magnetically charged GMGHS, electrically charged GMGHS] and the rotating (Kerr-Sen dilaton-axion) dilaton black holes. The geodesic equations are solved in terms of Weierstrass ellip... |
1903.12479 | Seyed Hossein Hendi Dr. | S. H. Hendi, R. Ramezani-Arani and E. Rahimi | Thermal stability of a special class of black hole solutions in F(R)
gravity | 14 pages with 7 captioned figures. Some additional notes are added.
Accepted in EPJC | EPJC 79 (2019) 472 | 10.1140/epjc/s10052-019-6972-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we work on the topological Lifshitz-like black hole solutions
of a special class of vacuum $F(R)-$gravity that are static and spherically
symmetric. We investigate geometric and thermodynamic properties of the
solutions with due respect to the validity of the first law of thermodynamics.
We examine the... | [
{
"created": "Wed, 27 Mar 2019 11:34:54 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2019 05:40:13 GMT",
"version": "v2"
}
] | 2019-10-30 | [
[
"Hendi",
"S. H.",
""
],
[
"Ramezani-Arani",
"R.",
""
],
[
"Rahimi",
"E.",
""
]
] | In this paper, we work on the topological Lifshitz-like black hole solutions of a special class of vacuum $F(R)-$gravity that are static and spherically symmetric. We investigate geometric and thermodynamic properties of the solutions with due respect to the validity of the first law of thermodynamics. We examine the v... |
1512.04304 | Przemyslaw Malkiewicz | Przemyslaw Malkiewicz | Affine Coherent States in Quantum Cosmology | 6 pages, Proceedings of the 14th Marcel Grossmann Meeting (Rome, July
12-18, 2015) | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A brief summary of the application of coherent states in the examination of
quantum dynamics of cosmological models is given. We discuss quantization maps,
phase space probability distributions and semiclassical phase spaces. The
implementation of coherent states based on the affine group resolves the
hardest singula... | [
{
"created": "Mon, 14 Dec 2015 13:35:59 GMT",
"version": "v1"
}
] | 2015-12-15 | [
[
"Malkiewicz",
"Przemyslaw",
""
]
] | A brief summary of the application of coherent states in the examination of quantum dynamics of cosmological models is given. We discuss quantization maps, phase space probability distributions and semiclassical phase spaces. The implementation of coherent states based on the affine group resolves the hardest singulari... |
2304.13577 | Gustaf Rydbeck | Gustaf Rydbeck | Bounce inflation with a conserved frame of rest | 5 pages, 4 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | Some form of approximately exponential inflation is generally assumed to be
the origin of our present universe. The inflation is thought to be driven by a
scalar field potential where the field first slowly slides along the potential
and then comes to a steep slope where the field rapidly falls and then
oscillates ar... | [
{
"created": "Wed, 26 Apr 2023 14:12:49 GMT",
"version": "v1"
}
] | 2023-04-27 | [
[
"Rydbeck",
"Gustaf",
""
]
] | Some form of approximately exponential inflation is generally assumed to be the origin of our present universe. The inflation is thought to be driven by a scalar field potential where the field first slowly slides along the potential and then comes to a steep slope where the field rapidly falls and then oscillates arou... |
1509.04066 | Christopher Moore | Christopher J. Moore, Christopher P. L. Berry, Alvin J. K. Chua and
Jonathan R. Gair | Improving gravitational-wave parameter estimation using Gaussian process
regression | 25 pages, 11 figures, Published March 2016 | Phys. Rev. D 93, 064001 (2016) | 10.1103/PhysRevD.93.064001 | LIGO-P1500162 | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Folding uncertainty in theoretical models into Bayesian parameter estimation
is necessary in order to make reliable inferences. A general means of achieving
this is by marginalizing over model uncertainty using a prior distribution
constructed using Gaussian process regression (GPR). As an example, we apply
this tech... | [
{
"created": "Mon, 14 Sep 2015 12:49:45 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2016 13:17:48 GMT",
"version": "v2"
}
] | 2016-03-04 | [
[
"Moore",
"Christopher J.",
""
],
[
"Berry",
"Christopher P. L.",
""
],
[
"Chua",
"Alvin J. K.",
""
],
[
"Gair",
"Jonathan R.",
""
]
] | Folding uncertainty in theoretical models into Bayesian parameter estimation is necessary in order to make reliable inferences. A general means of achieving this is by marginalizing over model uncertainty using a prior distribution constructed using Gaussian process regression (GPR). As an example, we apply this techni... |
gr-qc/0307020 | Nils Andersson | N Andersson and C.J. Howls | The asymptotic quasinormal mode spectrum of non-rotating black holes | 18 pages, RevTeX, 3 eps figures | Class.Quant.Grav.21:1623-1642,2004 | 10.1088/0264-9381/21/6/021 | null | gr-qc hep-th | null | A conjectured connection to quantum gravity has led to a renewed interest in
highly damped black hole quasinormal modes (QNMs). In this paper we present
simple derivations (based on the WKB approximation) of conditions that
determine the asymptotic QNMs for both Schwarzschild and Reissner-Nordstrom
black holes. This ... | [
{
"created": "Fri, 4 Jul 2003 15:34:59 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Andersson",
"N",
""
],
[
"Howls",
"C. J.",
""
]
] | A conjectured connection to quantum gravity has led to a renewed interest in highly damped black hole quasinormal modes (QNMs). In this paper we present simple derivations (based on the WKB approximation) of conditions that determine the asymptotic QNMs for both Schwarzschild and Reissner-Nordstrom black holes. This co... |
2401.09577 | Scott A. Hughes | Scott A. Hughes | Parameterizing black hole orbits for adiabatic inspiral | 10 pages, 5 figures, version to appear in Physical Review D.
Incorporates helpful feedback from the referee and a few other comments
received since this paper was originally posted. Posting includes Mathematica
notebook and C++ code which implements the methods developed in this paper | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adiabatic binary inspiral in the small mass ratio limit treats the small body
as moving along a geodesic of a large Kerr black hole, with the geodesic slowly
evolving due to radiative backreaction. Up to initial conditions, geodesics are
typically parameterized in two ways: using the integrals of motion energy $E$,
a... | [
{
"created": "Wed, 17 Jan 2024 19:57:45 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2024 22:16:57 GMT",
"version": "v2"
}
] | 2024-03-28 | [
[
"Hughes",
"Scott A.",
""
]
] | Adiabatic binary inspiral in the small mass ratio limit treats the small body as moving along a geodesic of a large Kerr black hole, with the geodesic slowly evolving due to radiative backreaction. Up to initial conditions, geodesics are typically parameterized in two ways: using the integrals of motion energy $E$, axi... |
1805.01233 | Konstantinos Dialektopoulos F. | Salvatore Capozziello, Konstantinos F. Dialektopoulos and Orlando
Luongo | Maximum turnaround radius in $f(R)$ gravity | 8 pages, 1 figure | null | 10.1142/S0218271819500585 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The accelerating behavior of cosmic fluid opposes to the gravitational
attraction, at present epoch, whereas standard gravity is dominant at small
scales. As a consequence, there exists a \emph{point} where the effects are
counterbalanced, dubbed \emph{turnaround radius}, $r_{\text{ta}}$. By
construction, it provides... | [
{
"created": "Thu, 3 May 2018 11:33:09 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Dialektopoulos",
"Konstantinos F.",
""
],
[
"Luongo",
"Orlando",
""
]
] | The accelerating behavior of cosmic fluid opposes to the gravitational attraction, at present epoch, whereas standard gravity is dominant at small scales. As a consequence, there exists a \emph{point} where the effects are counterbalanced, dubbed \emph{turnaround radius}, $r_{\text{ta}}$. By construction, it provides a... |
gr-qc/0212107 | Valery Gavrilov | H. Dehnen, V. R. Gavrilov and V. N. Melnikov | General solutions for flat Friedmann universe filled by perfect fluid
and scalar field with exponential potential | 13 pages, Latex, 1 figure, submit. to Class. Quantum Grav | Grav.Cosmol. 9 (2003) 189-195 | null | IGC-PFUR-05/2002 | gr-qc | null | We study integrability by quadrature of a spatially flat Friedmann model
containing both a minimally coupled scalar field $\phi$ with an exponential
potential $V(\phi)\sim\exp[-\sqrt{6}\sigma\kappa\phi]$, $\kappa=\sqrt{8\pi
G_N}$, of arbitrary sign and a perfect fluid with barotropic equation of state
$p=(1-h)\rho$. ... | [
{
"created": "Thu, 26 Dec 2002 12:04:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dehnen",
"H.",
""
],
[
"Gavrilov",
"V. R.",
""
],
[
"Melnikov",
"V. N.",
""
]
] | We study integrability by quadrature of a spatially flat Friedmann model containing both a minimally coupled scalar field $\phi$ with an exponential potential $V(\phi)\sim\exp[-\sqrt{6}\sigma\kappa\phi]$, $\kappa=\sqrt{8\pi G_N}$, of arbitrary sign and a perfect fluid with barotropic equation of state $p=(1-h)\rho$. Fr... |
1112.5776 | Christian Corda cordac | Christian Corda | Tuning the stochastic background of gravitational waves using the WMAP
data | 9 pages, 2 figures, published in Modern Physics Letters A. arXiv
admin note: substantial text overlap with arXiv:0901.1193 | Mod. Phys. Lett. A, 22, 16, 1167-1173 (2007) | 10.1142/S0217732307023523 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological bound of the stochastic background of gravitational waves is
analyzed with the aid of the WMAP data, differently from lots of works in
literature, where the old COBE data were used. From our analysis, it will
result that the WMAP bounds on the energy spectrum and on the characteristic
amplitude of th... | [
{
"created": "Sun, 25 Dec 2011 11:29:46 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Corda",
"Christian",
""
]
] | The cosmological bound of the stochastic background of gravitational waves is analyzed with the aid of the WMAP data, differently from lots of works in literature, where the old COBE data were used. From our analysis, it will result that the WMAP bounds on the energy spectrum and on the characteristic amplitude of the ... |
2305.02184 | Christian Corda Prof. | Christian Corda | Black hole spectra from Vaz's quantum gravitational collapse | Final version matching the one published in Fortschritte der Physik -
Progress of Physics. Comments are welcome | Fortschr. Phys. 2023, 2300028 | 10.1002/prop.202300028 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2014, in a famous paper Hawking strongly criticized the firewall paradox
by claiming that it violates the equivalence principle and breaks the CPT
invariance of quantum gravity. He proposed that the final result of the
gravitational collapse should not be an event horizon, but an apparent horizon
instead. On the o... | [
{
"created": "Sat, 29 Apr 2023 09:37:58 GMT",
"version": "v1"
},
{
"created": "Sun, 14 May 2023 10:14:55 GMT",
"version": "v2"
}
] | 2023-05-16 | [
[
"Corda",
"Christian",
""
]
] | In 2014, in a famous paper Hawking strongly criticized the firewall paradox by claiming that it violates the equivalence principle and breaks the CPT invariance of quantum gravity. He proposed that the final result of the gravitational collapse should not be an event horizon, but an apparent horizon instead. On the oth... |
0909.4194 | Goffredo Chirco | G. Chirco, S. Liberati | Non-equilibrium Thermodynamics of Spacetime: the Role of Gravitational
Dissipation | 13 pages, 1 figure | Phys.Rev.D81:024016,2010 | 10.1103/PhysRevD.81.024016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In arXiv:gr-qc/9504004 it was shown that the Einstein equation can be derived
as a local constitutive equation for an equilibrium spacetime thermodynamics.
More recently, in the attempt to extend the same approach to the case of $f(R)$
theories of gravity, it was found that a non-equilibrium setting is indeed
require... | [
{
"created": "Wed, 23 Sep 2009 12:46:44 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Chirco",
"G.",
""
],
[
"Liberati",
"S.",
""
]
] | In arXiv:gr-qc/9504004 it was shown that the Einstein equation can be derived as a local constitutive equation for an equilibrium spacetime thermodynamics. More recently, in the attempt to extend the same approach to the case of $f(R)$ theories of gravity, it was found that a non-equilibrium setting is indeed required ... |
1906.06022 | Dong-han Yeom | Suddhasattwa Brahma, Dong-han Yeom | Can a false vacuum bubble remove the singularity inside a black hole? | 16 pages, 7 figures | Eur.Phys.J. C80 (2020) 713 | 10.1140/epjc/s10052-020-8248-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a regular black hole model with a de Sitter-like core at its
center. This type of a black hole model with a false vacuum core was introduced
with the hope of singularity-resolution and is a common feature shared by many
regular black holes. In this paper, we examine this claim of a singularity-free
bla... | [
{
"created": "Fri, 14 Jun 2019 05:00:22 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Aug 2020 02:17:48 GMT",
"version": "v2"
}
] | 2020-08-12 | [
[
"Brahma",
"Suddhasattwa",
""
],
[
"Yeom",
"Dong-han",
""
]
] | We investigate a regular black hole model with a de Sitter-like core at its center. This type of a black hole model with a false vacuum core was introduced with the hope of singularity-resolution and is a common feature shared by many regular black holes. In this paper, we examine this claim of a singularity-free black... |
1803.09148 | Yan Peng | Yan Peng, Bin Wang, Yunqi Liu | Scalar field condensation behaviors around reflecting shells in Anti-de
Sitter spacetimes | 10 pages,3 figures | Eur.Phys.J. C78 (2018) no.8, 680 | 10.1140/epjc/s10052-018-6169-2 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scalar condensations around asymptotically Anti-de Sitter(AdS)
regular reflecting shells. We show that the charged scalar field can condense
around charged reflecting shells with both Dirichlet and Neumann boundary
conditions. In particular, the radii of the asymptotically AdS hairy shells are
discrete, whic... | [
{
"created": "Sat, 24 Mar 2018 18:45:14 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Aug 2018 17:38:11 GMT",
"version": "v2"
}
] | 2018-08-29 | [
[
"Peng",
"Yan",
""
],
[
"Wang",
"Bin",
""
],
[
"Liu",
"Yunqi",
""
]
] | We study scalar condensations around asymptotically Anti-de Sitter(AdS) regular reflecting shells. We show that the charged scalar field can condense around charged reflecting shells with both Dirichlet and Neumann boundary conditions. In particular, the radii of the asymptotically AdS hairy shells are discrete, which ... |
1608.02115 | Deyou Chen | Deyou Chen, Xiaoxiong Zeng | Modifying horizon thermodynamics by surface tensions | 12 pages, references added | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The modified first laws of thermodynamics at the black hole horizon and the
cosmological horizon of the Schwarzschild de Sitter black hole and the apparent
horizon of the Friedmann-Robertson-Walker cosmology are derived by the surface
tensions, respectively. The corresponding Smarr relations are obeyed. For the
black... | [
{
"created": "Sat, 6 Aug 2016 14:54:13 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2016 12:26:48 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Aug 2016 08:18:13 GMT",
"version": "v3"
}
] | 2016-08-15 | [
[
"Chen",
"Deyou",
""
],
[
"Zeng",
"Xiaoxiong",
""
]
] | The modified first laws of thermodynamics at the black hole horizon and the cosmological horizon of the Schwarzschild de Sitter black hole and the apparent horizon of the Friedmann-Robertson-Walker cosmology are derived by the surface tensions, respectively. The corresponding Smarr relations are obeyed. For the black h... |
2312.11665 | Michael Kachelrie{\ss} | M. Kachelriess, M. P. N{\o}dtvedt | Lunar response to gravitational waves | 17 pages, 15 pdf figures | null | null | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been suggested to use seismic detectors on the Moon as a tool to
search for gravitational waves in an intermediate frequency range between mHz
and Hz. Employing three different spherically symmetric models for the lunar
interior, we investigate the response of the Moon to gravitational waves in
Einstein and Jo... | [
{
"created": "Mon, 18 Dec 2023 19:17:24 GMT",
"version": "v1"
}
] | 2023-12-20 | [
[
"Kachelriess",
"M.",
""
],
[
"Nødtvedt",
"M. P.",
""
]
] | It has been suggested to use seismic detectors on the Moon as a tool to search for gravitational waves in an intermediate frequency range between mHz and Hz. Employing three different spherically symmetric models for the lunar interior, we investigate the response of the Moon to gravitational waves in Einstein and Jord... |
2310.14547 | Li-Ying Chou | Li-Ying Chou, Yi-Zen Chu, and Yen-Wei Liu | Scalar Gravitational Waves Can Be Generated Even Without Direct Coupling
Between Dark Energy and Ordinary Matter | 28 pages, 2 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out, the scalar sector of gravitational perturbations may be excited
by an isolated astrophysical system immersed in a universe whose accelerated
expansion is not due to the cosmological constant, but due to extra field
degrees of freedom. This is true even if the source of gravitational radiation
did not co... | [
{
"created": "Mon, 23 Oct 2023 04:01:58 GMT",
"version": "v1"
}
] | 2023-10-24 | [
[
"Chou",
"Li-Ying",
""
],
[
"Chu",
"Yi-Zen",
""
],
[
"Liu",
"Yen-Wei",
""
]
] | We point out, the scalar sector of gravitational perturbations may be excited by an isolated astrophysical system immersed in a universe whose accelerated expansion is not due to the cosmological constant, but due to extra field degrees of freedom. This is true even if the source of gravitational radiation did not coup... |
1006.4908 | Garrett Lisi | A. Garrett Lisi | An Explicit Embedding of Gravity and the Standard Model in E8 | To be submitted for peer review and publication in the "Proceedings
of the Conference on Representation Theory and Mathematical Physics." 14
pages. No figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The algebraic elements of gravitational and Standard Model gauge fields
acting on a generation of fermions may be represented using real matrices.
These elements match a subalgebra of spin(11,3) acting on a Majorana-Weyl
spinor, consistent with GraviGUT unification. This entire structure embeds in
the quaternionic re... | [
{
"created": "Fri, 25 Jun 2010 04:39:45 GMT",
"version": "v1"
}
] | 2010-06-28 | [
[
"Lisi",
"A. Garrett",
""
]
] | The algebraic elements of gravitational and Standard Model gauge fields acting on a generation of fermions may be represented using real matrices. These elements match a subalgebra of spin(11,3) acting on a Majorana-Weyl spinor, consistent with GraviGUT unification. This entire structure embeds in the quaternionic real... |
gr-qc/9312028 | Herbert Nachbagauer | Herbert Balasin and Herbert Nachbagauer | Distributional Energy-Momentum Tensor of the Kerr-Newman Space-Time
Family | 13 pages, ENSLAPP-A-453/93, TUW 93-28 | Class.Quant.Grav.11:1453-1462,1994 | 10.1088/0264-9381/11/6/010 | null | gr-qc | null | Using the Kerr-Schild decomposition of the metric tensor that employs the
algebraically special nature of the Kerr-Newman space-time family, we calculate
the energy-momentum tensor. The latter turns out to be a well-defined
tensor-distribution with disk-like support.
| [
{
"created": "Fri, 17 Dec 1993 14:13:21 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Balasin",
"Herbert",
""
],
[
"Nachbagauer",
"Herbert",
""
]
] | Using the Kerr-Schild decomposition of the metric tensor that employs the algebraically special nature of the Kerr-Newman space-time family, we calculate the energy-momentum tensor. The latter turns out to be a well-defined tensor-distribution with disk-like support. |
gr-qc/9508001 | Gregory A. Burnett | Gregory A. Burnett (UF) and Alan D. Rendall (IHES) | Existence of maximal hypersurfaces in some spherically symmetric
spacetimes | 8 pages, REVTeX 3.0 | Class.Quant.Grav.13:111-124,1996 | 10.1088/0264-9381/13/1/010 | UF-RAP-95-32 | gr-qc dg-ga math.DG | null | We prove that the maximal development of any spherically symmetric spacetime
with collisionless matter (obeying the Vlasov equation) or a massless scalar
field (obeying the massless wave equation) and possessing a constant mean
curvature $S^1 \times S^2$ Cauchy surface also contains a maximal Cauchy
surface. Combinin... | [
{
"created": "Tue, 1 Aug 1995 19:24:23 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Burnett",
"Gregory A.",
"",
"UF"
],
[
"Rendall",
"Alan D.",
"",
"IHES"
]
] | We prove that the maximal development of any spherically symmetric spacetime with collisionless matter (obeying the Vlasov equation) or a massless scalar field (obeying the massless wave equation) and possessing a constant mean curvature $S^1 \times S^2$ Cauchy surface also contains a maximal Cauchy surface. Combining ... |
gr-qc/9607032 | Douglas Vivian Long | D. V. Long and G. M. Shore | The Schrodinger Wave Functional and Vacuum State in Curved Spacetime II.
Boundaries and Foliations | 26 pages, 4 figures, LATEX | Nucl.Phys. B530 (1998) 279-303 | 10.1016/S0550-3213(98)00409-X | SWAT 96/124 | gr-qc hep-th | null | In a recent paper, general solutions for the vacuum wave functionals in the
Schrodinger picture were given for a variety of classes of curved spacetimes.
Here, we describe a number of simple examples which illustrate how the presence
of spacetime boundaries influences the vacuum wave functional and how physical
quant... | [
{
"created": "Sun, 14 Jul 1996 19:05:31 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Long",
"D. V.",
""
],
[
"Shore",
"G. M.",
""
]
] | In a recent paper, general solutions for the vacuum wave functionals in the Schrodinger picture were given for a variety of classes of curved spacetimes. Here, we describe a number of simple examples which illustrate how the presence of spacetime boundaries influences the vacuum wave functional and how physical quantit... |
0803.1820 | \'Etienne Racine | Etienne Racine | Analysis of spin precession in binary black hole systems including
quadrupole-monopole interaction | version published in Phys. Rev. D, with improved figures and more
detailed discussion of cubic anharmonic oscillator | Phys.Rev.D78:044021,2008 | 10.1103/PhysRevD.78.044021 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze in detail the spin precession equations in binary black hole
systems, when the tidal torque on a Kerr black hole due to quadrupole-monopole
coupling is taken into account. We show that completing the precession
equations with this term reveals the existence of a conserved quantity at 2PN
order when averagi... | [
{
"created": "Wed, 12 Mar 2008 18:35:15 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2008 00:04:31 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Aug 2008 18:02:22 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Racine",
"Etienne",
""
]
] | We analyze in detail the spin precession equations in binary black hole systems, when the tidal torque on a Kerr black hole due to quadrupole-monopole coupling is taken into account. We show that completing the precession equations with this term reveals the existence of a conserved quantity at 2PN order when averaging... |
1901.03720 | Khalid Saifullah | Askar Ali and Khalid Saifullah | Magnetized topological black holes of dimensionally continued gravity | Matches the published version | Phys. Rev. D 99, 124052 (2019) | 10.1103/PhysRevD.99.124052 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a large family of topological black hole solutions of
dimensionally continued gravity are derived. The action of Lovelock gravity is
coupled to the exponential electrodynamics and the equations of motion are
solved in the presence of a pure magnetic source. We work out the metric
functions in terms of ... | [
{
"created": "Fri, 11 Jan 2019 19:23:45 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2019 08:38:14 GMT",
"version": "v2"
}
] | 2019-07-11 | [
[
"Ali",
"Askar",
""
],
[
"Saifullah",
"Khalid",
""
]
] | In this paper, a large family of topological black hole solutions of dimensionally continued gravity are derived. The action of Lovelock gravity is coupled to the exponential electrodynamics and the equations of motion are solved in the presence of a pure magnetic source. We work out the metric functions in terms of th... |
1804.03813 | Neda Farhangkhah | N. Farhangkhah | Topologically nontrivial black holes in Lovelock-Born-Infeld gravity | 15 pages, 5 figures, accepted version by Phys. Rev. D | Phys. Rev. D 97, 084031 (2018) | 10.1103/PhysRevD.97.084031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the black hole solutions possessing horizon with
nonconstant-curvature and additional scalar restrictions on the base manifold
in Lovelock gravity coupled to Born-Infeld (BI) nonlinear electrodynamics. The
asymptotic and near origin behavior of the metric is presented and we analyze
different behaviors of ... | [
{
"created": "Wed, 11 Apr 2018 05:11:30 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Farhangkhah",
"N.",
""
]
] | We present the black hole solutions possessing horizon with nonconstant-curvature and additional scalar restrictions on the base manifold in Lovelock gravity coupled to Born-Infeld (BI) nonlinear electrodynamics. The asymptotic and near origin behavior of the metric is presented and we analyze different behaviors of th... |
0902.2440 | Sunil Maharaj | S. D. Maharaj, S. Thirukkanesh | Generalised isothermal models with strange equation of state | 14 pages, To appear in Pramana - J. Phys | Pramana - J. Phys. 72: 481-494, 2009 | 10.1007/s12043-009-0043-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the linear equation of state for matter distributions that may be
applied to strange stars with quark matter. In our general approach the compact
relativistic body allows for anisotropic pressures in the presence of the
electromagnetic field. New exact solutions are found to the Einstein-Maxwell
system. A... | [
{
"created": "Sat, 14 Feb 2009 08:15:58 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Maharaj",
"S. D.",
""
],
[
"Thirukkanesh",
"S.",
""
]
] | We consider the linear equation of state for matter distributions that may be applied to strange stars with quark matter. In our general approach the compact relativistic body allows for anisotropic pressures in the presence of the electromagnetic field. New exact solutions are found to the Einstein-Maxwell system. A p... |
1401.7378 | Kazuharu Bamba | Kazuharu Bamba, Shin'ichi Nojiri and Sergei D. Odintsov | Trace-anomaly driven inflation in $f(T)$ gravity and in minimal massive
bigravity | 13 pages, no figure, version accepted for publication in Physics
Letters B | Physics Letters B 731 (2014) 257-264 | 10.1016/j.physletb.2014.02.041 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore trace-anomaly driven inflation in modified gravity. It is
explicitly shown that in $T^2$ teleparallel gravity, the de Sitter inflation
can occur, although quasi de Sitter inflation happens in $R^2$ gravity.
Furthermore, we investigate the influence of the trace anomaly on inflation. It
is found that in $f(... | [
{
"created": "Wed, 29 Jan 2014 00:49:37 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Feb 2014 01:36:21 GMT",
"version": "v2"
}
] | 2014-03-14 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | We explore trace-anomaly driven inflation in modified gravity. It is explicitly shown that in $T^2$ teleparallel gravity, the de Sitter inflation can occur, although quasi de Sitter inflation happens in $R^2$ gravity. Furthermore, we investigate the influence of the trace anomaly on inflation. It is found that in $f(T)... |
gr-qc/0009077 | Juan Eloy Ayon Beato | Eloy Ay\'on-Beato, Alberto Garc\'ia | The Bardeen Model as a Nonlinear Magnetic Monopole | 4 pages, RevTex; accepted for publication in Phys. Lett. B | Phys.Lett. B493 (2000) 149-152 | 10.1016/S0370-2693(00)01125-4 | null | gr-qc hep-th | null | The Bardeen model -- the first regular black hole model in General Relativity
-- is reinterpreted as the gravitational field of a nonlinear magnetic
monopole, i.e., as a magnetic solution to Einstein equations coupled to a
nonlinear electrodynamics.
| [
{
"created": "Fri, 22 Sep 2000 00:44:55 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Ayón-Beato",
"Eloy",
""
],
[
"García",
"Alberto",
""
]
] | The Bardeen model -- the first regular black hole model in General Relativity -- is reinterpreted as the gravitational field of a nonlinear magnetic monopole, i.e., as a magnetic solution to Einstein equations coupled to a nonlinear electrodynamics. |
2405.18934 | Lorenzo Mirasola | Lorenzo Mirasola, Rodrigo Tenorio | Towards a computationally-efficient follow-up pipeline for blind
continuous gravitational-wave searches | 18 pages, 14 figures, comments welcome | null | null | LIGO-P2400221 | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sensitivity of continuous gravitational-wave (CW) searches for unknown
neutron stars (NSs) is limited by their parameter space breadth. To fit within
reasonable computing budgets, hierarchical schemes are used to identify
interesting candidates using affordable methods. The resulting sensitivity
critically depend... | [
{
"created": "Wed, 29 May 2024 09:38:04 GMT",
"version": "v1"
}
] | 2024-05-30 | [
[
"Mirasola",
"Lorenzo",
""
],
[
"Tenorio",
"Rodrigo",
""
]
] | The sensitivity of continuous gravitational-wave (CW) searches for unknown neutron stars (NSs) is limited by their parameter space breadth. To fit within reasonable computing budgets, hierarchical schemes are used to identify interesting candidates using affordable methods. The resulting sensitivity critically depends ... |
1806.01903 | John W. Moffat | J. W. Moffat | Regular Rotating MOG Dark Compact Object | 9 pages, 2 figures. Article now matches published version | European Physical Journal C, 81:119 (2021) | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A regular rotating MOG (modified gravity) compact object is derived that
reduces to the Kerr black hole when the parameter $\alpha=0$. Physical
consequences of the dark compact object, which is regular everywhere in
spacetime for $\alpha > \alpha_{\rm crit}=0.674$ and is a rotating Kerr-MOG
black hole for $\alpha < \... | [
{
"created": "Tue, 5 Jun 2018 19:25:03 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Feb 2021 17:23:42 GMT",
"version": "v2"
}
] | 2021-02-15 | [
[
"Moffat",
"J. W.",
""
]
] | A regular rotating MOG (modified gravity) compact object is derived that reduces to the Kerr black hole when the parameter $\alpha=0$. Physical consequences of the dark compact object, which is regular everywhere in spacetime for $\alpha > \alpha_{\rm crit}=0.674$ and is a rotating Kerr-MOG black hole for $\alpha < \al... |
1209.0862 | Debaprasad Maity | Debaprasad Maity | Semi-realistic Bouncing Domain Wall Cosmology | 19 pages, 2 figures, Typos corrected and little change in title | null | 10.1103/PhysRevD.86.084056 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we constructed a semi-realistic cosmological model in a dynamic
domain wall framework. Our universe is considered to be a (3+1) dimensional
dynamic domain wall in a higher dimensional Einstein-Maxwell-Born-Infeld
background. One of our interesting outcomes from the effective Hubble equation
for the doma... | [
{
"created": "Wed, 5 Sep 2012 05:49:16 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2012 17:25:59 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Maity",
"Debaprasad",
""
]
] | In this paper we constructed a semi-realistic cosmological model in a dynamic domain wall framework. Our universe is considered to be a (3+1) dimensional dynamic domain wall in a higher dimensional Einstein-Maxwell-Born-Infeld background. One of our interesting outcomes from the effective Hubble equation for the domain... |
1708.07532 | Shannon Ray | Warner A. Miller, Shannon Ray, Mu-Tao Wang and Shing-Tung Yau | Wang and Yau's Quasi-Local Energy for an Extreme Kerr Spacetime | 25 pages, 10 figures | CQG-104058.R2, 2018 | 10.1088/1361-6382/aaa625 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There exist constant radial surfaces, $\mathcal{S}$, that may not be globally
embeddable in $\mathbb{R}^3$ for Kerr spacetimes with $a>\sqrt{3}M/2$. To
compute the Brown and York (B-Y) quasi-local energy (QLE), one must
isometrically embed $\mathcal{S}$ into $\mathbb{R}^3$. On the other hand, the
Wang and Yau (W-Y) Q... | [
{
"created": "Thu, 24 Aug 2017 19:26:08 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2018 19:23:34 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Miller",
"Warner A.",
""
],
[
"Ray",
"Shannon",
""
],
[
"Wang",
"Mu-Tao",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | There exist constant radial surfaces, $\mathcal{S}$, that may not be globally embeddable in $\mathbb{R}^3$ for Kerr spacetimes with $a>\sqrt{3}M/2$. To compute the Brown and York (B-Y) quasi-local energy (QLE), one must isometrically embed $\mathcal{S}$ into $\mathbb{R}^3$. On the other hand, the Wang and Yau (W-Y) QLE... |
1707.02841 | Mahmood Roshan | Sara Jamali, Mahmood Roshan and Luca Amendola | On the cosmology of scalar-tensor-vector gravity theory | Accepted version for publication in JCAP | null | 10.1088/1475-7516/2018/01/048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the cosmological consequences of a special scalar-tensor-vector
theory of gravity, known as MOG (for MOdified Gravity), proposed to address the
dark matter problem. This theory introduces two scalar fields $G(x)$ and
$\mu(x)$, and one vector field $\phi_{\alpha}(x)$, in addition to the metric
tensor. We s... | [
{
"created": "Mon, 10 Jul 2017 13:24:23 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jan 2018 05:11:16 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Jamali",
"Sara",
""
],
[
"Roshan",
"Mahmood",
""
],
[
"Amendola",
"Luca",
""
]
] | We consider the cosmological consequences of a special scalar-tensor-vector theory of gravity, known as MOG (for MOdified Gravity), proposed to address the dark matter problem. This theory introduces two scalar fields $G(x)$ and $\mu(x)$, and one vector field $\phi_{\alpha}(x)$, in addition to the metric tensor. We set... |
gr-qc/0205065 | Stephen Parrott | Stephen Parrott | Asymptotics of a proposed delay-differential equation of motion for
charged particles | The previous version contained all the referees' reports, verbatim.
This version deletes them at the arXiv's request. The previous version is
available from the author--see Section 11, p. 27 for details | null | null | null | gr-qc | null | We study the behavior in the remote past and future of solutions of an
equation of motion for charged particles proposed by F. Rohrlich, for the
special case in which the motion is in one spatial dimension.
We show that if an external force is applied for a finite time, some
solutions exhibit the property of ``prea... | [
{
"created": "Thu, 16 May 2002 02:55:43 GMT",
"version": "v1"
},
{
"created": "Thu, 30 May 2002 01:53:38 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Apr 2004 05:56:43 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Jul 2004 03:12:50 GMT",
"version": "v4"
},
{
"c... | 2007-05-23 | [
[
"Parrott",
"Stephen",
""
]
] | We study the behavior in the remote past and future of solutions of an equation of motion for charged particles proposed by F. Rohrlich, for the special case in which the motion is in one spatial dimension. We show that if an external force is applied for a finite time, some solutions exhibit the property of ``preaccel... |
2111.01595 | Mart\'in G. Richarte MR | Mart\'in G. Richarte, \'Ebano L. Martins, and J\'ulio C. Fabris | Scattering and absorption of a scalar field impinging on a charged black
hole in the Einstein-Maxwell-dilaton theory | Accepted for its publication in Physical Review D | null | 10.1103/PhysRevD.105.064043 | null | gr-qc astro-ph.GA hep-th math-ph math.MP physics.space-ph | http://creativecommons.org/licenses/by/4.0/ | This study revisits the absorption and scattering process by which a massless
scalar field impinges on a charged dilatonic black hole. First, we review the
classical analysis to obtain the deflection angle and the differential
scattering cross-section. Then, using the partial wave method, we determine the
total absor... | [
{
"created": "Tue, 2 Nov 2021 13:52:28 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2022 14:41:06 GMT",
"version": "v2"
},
{
"created": "Sat, 26 Feb 2022 13:35:01 GMT",
"version": "v3"
}
] | 2022-03-28 | [
[
"Richarte",
"Martín G.",
""
],
[
"Martins",
"Ébano L.",
""
],
[
"Fabris",
"Júlio C.",
""
]
] | This study revisits the absorption and scattering process by which a massless scalar field impinges on a charged dilatonic black hole. First, we review the classical analysis to obtain the deflection angle and the differential scattering cross-section. Then, using the partial wave method, we determine the total absorpt... |
1601.01382 | Lorenzo Iorio | Lorenzo Iorio | The Solar Lense-Thirring effect: perspectives for a future measurement | 3 pages, no figures, no tables, 10 references. Contribution to the
proceedings of "The Fourteenth Marcel Grossmann Meeting on General
Relativity" based on a talk delivered at the PT5 parallel session | The Fourteenth Marcel Grossmann Meeting: pp. 3679-3681, World
Scientific, 2017 | 10.1142/9789813226609_0479 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The predicted Lense-Thirring perihelion precession of Mercury induced by the
Sun's angular momentum through its general relativistic gravitomagnetic field
amounts to 2 milliarcseconds per century. It turned out to be compatible with
the latest experimental determinations of the supplementary perihelion
precession of ... | [
{
"created": "Thu, 7 Jan 2016 03:13:57 GMT",
"version": "v1"
}
] | 2017-11-28 | [
[
"Iorio",
"Lorenzo",
""
]
] | The predicted Lense-Thirring perihelion precession of Mercury induced by the Sun's angular momentum through its general relativistic gravitomagnetic field amounts to 2 milliarcseconds per century. It turned out to be compatible with the latest experimental determinations of the supplementary perihelion precession of Me... |
1107.1688 | Darius Bunandar | Darius Bunandar, Scott A. Caveny, and Richard A. Matzner | Measuring emission coordinates in a pulsar-based relativistic
positioning system | 9 pages, 2 figures, v3: replaced with version accepted by Phys. Rev.
D | Physical Review D 84, 104005 (2011) | 10.1103/PhysRevD.84.104005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A relativistic deep space positioning system has been proposed using four or
more pulsars with stable repetition rates. (Each pulsar emits pulses at a fixed
repetition period in its rest frame.) The positioning system uses the fact that
an event in spacetime can be fully described by emission coordinates: the
proper ... | [
{
"created": "Fri, 8 Jul 2011 18:03:43 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2011 04:27:08 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Nov 2011 12:34:29 GMT",
"version": "v3"
},
{
"created": "Thu, 8 Dec 2011 14:21:36 GMT",
"version": "v4"
}
] | 2011-12-09 | [
[
"Bunandar",
"Darius",
""
],
[
"Caveny",
"Scott A.",
""
],
[
"Matzner",
"Richard A.",
""
]
] | A relativistic deep space positioning system has been proposed using four or more pulsars with stable repetition rates. (Each pulsar emits pulses at a fixed repetition period in its rest frame.) The positioning system uses the fact that an event in spacetime can be fully described by emission coordinates: the proper em... |
2403.20164 | Kfir Blum | Kfir Blum and Mehrdad Mirbabayi | A single-bubble source for gravitational waves in a cosmological phase
transition | 15 pages, 1 figure | null | null | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We show that quantum fluctuations of an expanding phase transition bubble
give rise to gravitational wave (GW) emission, even when considering a single
bubble, without bubble collisions or plasma effects. The ratio of GW energy to
the total bubble energy reservoir increases with time as $\propto t$. If the
bubble exp... | [
{
"created": "Fri, 29 Mar 2024 13:28:16 GMT",
"version": "v1"
}
] | 2024-04-03 | [
[
"Blum",
"Kfir",
""
],
[
"Mirbabayi",
"Mehrdad",
""
]
] | We show that quantum fluctuations of an expanding phase transition bubble give rise to gravitational wave (GW) emission, even when considering a single bubble, without bubble collisions or plasma effects. The ratio of GW energy to the total bubble energy reservoir increases with time as $\propto t$. If the bubble expan... |
1903.03437 | Behnam Pourhassan | M. Rostami, J. Sadeghi, S. Miraboutalebi, and B. Pourhassan | The temperature and entropy corrections on the charged hairy black holes | 23 pages, 13 figures | Annals of Physics 429 (2021) 168488 | 10.1016/j.aop.2021.168488 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the first order correction of the entropy and
temperature in a charged black hole with a scalar field. Here, we apply such
correction for the different cases of black holes. These corrections are due to
the thermal fluctuations of statistical physics. Also, we take advantage of
such correct... | [
{
"created": "Mon, 4 Mar 2019 06:48:55 GMT",
"version": "v1"
},
{
"created": "Wed, 15 May 2019 19:48:43 GMT",
"version": "v2"
}
] | 2021-05-11 | [
[
"Rostami",
"M.",
""
],
[
"Sadeghi",
"J.",
""
],
[
"Miraboutalebi",
"S.",
""
],
[
"Pourhassan",
"B.",
""
]
] | In this paper, we consider the first order correction of the entropy and temperature in a charged black hole with a scalar field. Here, we apply such correction for the different cases of black holes. These corrections are due to the thermal fluctuations of statistical physics. Also, we take advantage of such correctio... |
gr-qc/0205128 | Ari Tapani Peltola | J. Makela and A. Peltola | Thermodynamical Properties of Horizons | 13 pages, 3 figures | null | null | null | gr-qc | null | We show, by using Regge calculus, that the entropy of any finite part of a
Rindler horizon is, in the semi-classical limit, one quarter of the area of
that part. We argue that this result implies that the entropy associated with
any horizon of spacetime is, in semi-classical limit, one quarter of its area.
As an exam... | [
{
"created": "Thu, 30 May 2002 12:30:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Makela",
"J.",
""
],
[
"Peltola",
"A.",
""
]
] | We show, by using Regge calculus, that the entropy of any finite part of a Rindler horizon is, in the semi-classical limit, one quarter of the area of that part. We argue that this result implies that the entropy associated with any horizon of spacetime is, in semi-classical limit, one quarter of its area. As an exampl... |
2311.18066 | Beatriz Elizaga Navascu\'es | Beatriz Elizaga Navascu\'es | On the evolution of the volume in Loop Quantum Cosmology | 11 pages, revised version | Class. Quantum Grav. 41, 145004, 2024 | 10.1088/1361-6382/ad56ee | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of the expectation value of the volume is one of the key
ingredients behind the replacement of the Big Bang singularity by a bounce in
Loop Quantum Cosmology. As such, it is of great importance that this quantity
is mathematically well-defined in the space of physical states of the theory. A
number of ca... | [
{
"created": "Wed, 29 Nov 2023 20:30:00 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2024 21:08:45 GMT",
"version": "v2"
}
] | 2024-07-04 | [
[
"Navascués",
"Beatriz Elizaga",
""
]
] | The dynamics of the expectation value of the volume is one of the key ingredients behind the replacement of the Big Bang singularity by a bounce in Loop Quantum Cosmology. As such, it is of great importance that this quantity is mathematically well-defined in the space of physical states of the theory. A number of cave... |
2011.11166 | Julio C\'esar Vera Hern\'andez | Julio C\'esar Vera-Hern\'andez | Quantum Phase Space Description of a Cosmological Minimal Massive
Bigravity Model | This is a post-peer-review, pre-copyedit version of an article
published in General Relativity and Gravitation. The final authenticated
version is available online at: https://doi.org/10.1007/s10714-021-02822-2 25
pages, 10 figures | null | 10.1007/s10714-021-02822-2 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Bimetric gravity theories describes gravitational interactions in the
presence of an extra spin-2 field. The Hassan-Rosen (HR) nonlinear massive
minimal bigravity theory is a ghost-free bimetric theory formulated with
respect a flat, dynamical reference metric. In this work the deformation
quantization formalism is a... | [
{
"created": "Mon, 23 Nov 2020 01:47:32 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2021 16:45:49 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Apr 2021 17:11:59 GMT",
"version": "v3"
},
{
"created": "Wed, 26 May 2021 20:38:35 GMT",
"version": "v4"
}
] | 2021-05-28 | [
[
"Vera-Hernández",
"Julio César",
""
]
] | Bimetric gravity theories describes gravitational interactions in the presence of an extra spin-2 field. The Hassan-Rosen (HR) nonlinear massive minimal bigravity theory is a ghost-free bimetric theory formulated with respect a flat, dynamical reference metric. In this work the deformation quantization formalism is app... |
0907.1169 | Deepak Baskaran Dr. | W. Zhao, D. Baskaran, L. P. Grishchuk | Stable indications of relic gravitational waves in Wilkinson Microwave
Anisotropy Probe data and forecasts for the Planck mission | 21 pages, including 12 figures, 2 tables, 2 appendices. Published in
Phys. Rev. D. V.3: minor corrections made to reflect the published version | Phys.Rev.D80:083005,2009 | 10.1103/PhysRevD.80.083005 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relic gravitational waves (gw) are the cleanest probe of the violent
times in the very early history of the Universe. They are expected to leave
signatures in the observed cosmic microwave background anisotropies. We
significantly improved our previous analysis [1] of the 5-year WMAP $TT$ and
$TE$ data at lower m... | [
{
"created": "Tue, 7 Jul 2009 09:31:37 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2009 10:55:56 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Oct 2009 13:24:22 GMT",
"version": "v3"
}
] | 2009-11-06 | [
[
"Zhao",
"W.",
""
],
[
"Baskaran",
"D.",
""
],
[
"Grishchuk",
"L. P.",
""
]
] | The relic gravitational waves (gw) are the cleanest probe of the violent times in the very early history of the Universe. They are expected to leave signatures in the observed cosmic microwave background anisotropies. We significantly improved our previous analysis [1] of the 5-year WMAP $TT$ and $TE$ data at lower mul... |
2209.00327 | Sumati Surya | P. Carlip, S. Carlip, S. Surya | Path integral suppression of badly behaved causal sets | 10 pages, 2 figures | null | 10.1088/1361-6382/acc50c | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Causal set theory is a discrete model of spacetime that retains a notion of
causal structure. We understand how to construct causal sets that approximate a
given spacetime, but most causal sets are not at all manifold-like, and must be
dynamically excluded if something like our universe is to emerge from the
theory. ... | [
{
"created": "Thu, 1 Sep 2022 09:55:30 GMT",
"version": "v1"
}
] | 2023-04-12 | [
[
"Carlip",
"P.",
""
],
[
"Carlip",
"S.",
""
],
[
"Surya",
"S.",
""
]
] | Causal set theory is a discrete model of spacetime that retains a notion of causal structure. We understand how to construct causal sets that approximate a given spacetime, but most causal sets are not at all manifold-like, and must be dynamically excluded if something like our universe is to emerge from the theory. He... |
gr-qc/0109092 | I. B. Khriplovich | I.B. Khriplovich | Entropy and Area of Black Holes in Loop Quantum Gravity | 8 pages, no figures; more detailed presentation of the arguments, the
results unchanged | Phys.Lett. B537 (2002) 125-129 | 10.1016/S0370-2693(02)01914-7 | null | gr-qc | null | Simple arguments related to the entropy of black holes strongly constrain the
spectrum of the area operator for a Schwarzschild black hole in loop quantum
gravity. In particular, this spectrum is fixed completely by the assumption
that the black hole entropy is maximum. Within the approach discussed, one
arrives in l... | [
{
"created": "Fri, 28 Sep 2001 07:16:26 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2001 08:14:19 GMT",
"version": "v2"
},
{
"created": "Sun, 31 Mar 2002 06:06:06 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Khriplovich",
"I. B.",
""
]
] | Simple arguments related to the entropy of black holes strongly constrain the spectrum of the area operator for a Schwarzschild black hole in loop quantum gravity. In particular, this spectrum is fixed completely by the assumption that the black hole entropy is maximum. Within the approach discussed, one arrives in loo... |
gr-qc/0104019 | Juan M. Aguirregabiria | J. M. Aguirregabiria, Ll. Bel, J. Martin, A. Molina and E. Ruiz | Comparing metrics at large: harmonic vs quo-harmonic coordinates | 27 pages, no figures | Gen.Rel.Grav. 33 (2001) 1809-1838 | 10.1023/A:1013083419220 | null | gr-qc | null | To compare two space-times on large domains, and in particular the global
structure of their manifolds, requires using identical frames of reference and
associated coordinate conditions. In this paper we use and compare two classes
of time-like congruences and corresponding adapted coordinates: the harmonic
and quo-h... | [
{
"created": "Thu, 5 Apr 2001 07:29:28 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Aguirregabiria",
"J. M.",
""
],
[
"Bel",
"Ll.",
""
],
[
"Martin",
"J.",
""
],
[
"Molina",
"A.",
""
],
[
"Ruiz",
"E.",
""
]
] | To compare two space-times on large domains, and in particular the global structure of their manifolds, requires using identical frames of reference and associated coordinate conditions. In this paper we use and compare two classes of time-like congruences and corresponding adapted coordinates: the harmonic and quo-har... |
gr-qc/0607037 | Joan Josep Ferrando | Bartolom\'e Coll, Joan Josep Ferrando, Juan Antonio Morales | Positioning with stationary emitters in a two-dimensional space-time | 14 pages; 5 figures | Phys.Rev. D74 (2006) 104003 | 10.1103/PhysRevD.74.104003 | null | gr-qc | null | The basic elements of the relativistic positioning systems in a
two-dimensional space-time have been introduced in a previous work [Phys. Rev.
D {\bf 73}, 084017 (2006)] where geodesic positioning systems, constituted by
two geodesic emitters, have been considered in a flat space-time. Here, we want
to show in what p... | [
{
"created": "Mon, 10 Jul 2006 14:27:25 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Nov 2006 13:41:02 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Coll",
"Bartolomé",
""
],
[
"Ferrando",
"Joan Josep",
""
],
[
"Morales",
"Juan Antonio",
""
]
] | The basic elements of the relativistic positioning systems in a two-dimensional space-time have been introduced in a previous work [Phys. Rev. D {\bf 73}, 084017 (2006)] where geodesic positioning systems, constituted by two geodesic emitters, have been considered in a flat space-time. Here, we want to show in what pre... |
0706.2319 | Irene Brito | E.G.L.R. Vaz and Irene Brito | Analysing the elasticity difference tensor of general relativity | 17 pages | Gen.Rel.Grav.40:1947-1966,2008 | 10.1007/s10714-008-0615-7 | null | gr-qc | null | The elasticity difference tensor, used in [1] to describe elasticity
properties of a continuous medium filling a space-time, is here analysed from
the point of view of the space-time connection. Principal directions associated
with this tensor are compared with eigendirections of the material metric.
Examples concern... | [
{
"created": "Fri, 15 Jun 2007 15:35:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Vaz",
"E. G. L. R.",
""
],
[
"Brito",
"Irene",
""
]
] | The elasticity difference tensor, used in [1] to describe elasticity properties of a continuous medium filling a space-time, is here analysed from the point of view of the space-time connection. Principal directions associated with this tensor are compared with eigendirections of the material metric. Examples concernin... |
gr-qc/0312046 | Floyd Williams | Floyd L. Williams | Remarks on harmonic maps, solitons, and dilaton gravity | 3 pages, to appear | null | null | null | gr-qc | null | Another connection of harmonic maps to gravity is presented. Using 1-soliton
and anti-soliton solutions of the sine-Gordon equation, we construct a pair of
harmonic maps that we express in terms of a particular dilaton field in
Jackiw-Teitelboim gravity. This field satisfies a linearized sine-Gordon
equation. We use ... | [
{
"created": "Mon, 8 Dec 2003 21:15:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Williams",
"Floyd L.",
""
]
] | Another connection of harmonic maps to gravity is presented. Using 1-soliton and anti-soliton solutions of the sine-Gordon equation, we construct a pair of harmonic maps that we express in terms of a particular dilaton field in Jackiw-Teitelboim gravity. This field satisfies a linearized sine-Gordon equation. We use it... |
1109.4086 | Bernd Schroers | Prince K. Osei and Bernd J. Schroers | On the semiduals of local isometry groups in 3d gravity | 33 pages, new version with expanded introduction and discussion,
similar to version which will appear in Journal of Mathematical Physics | null | 10.1063/1.4731229 | EMPG-11-23 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use factorisations of the local isometry groups arising in 3d gravity for
Lorentzian and Euclidean signatures and any value of the cosmological constant
to construct associated bicrossproduct quantum groups via semidualisation. In
this way we obtain quantum doubles of the Lorentz and rotation groups in 3d, as
well... | [
{
"created": "Mon, 19 Sep 2011 16:41:59 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2011 14:17:07 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Jun 2012 20:53:54 GMT",
"version": "v3"
}
] | 2015-05-30 | [
[
"Osei",
"Prince K.",
""
],
[
"Schroers",
"Bernd J.",
""
]
] | We use factorisations of the local isometry groups arising in 3d gravity for Lorentzian and Euclidean signatures and any value of the cosmological constant to construct associated bicrossproduct quantum groups via semidualisation. In this way we obtain quantum doubles of the Lorentz and rotation groups in 3d, as well a... |
2204.04451 | Vinod Bhardwaj Dr. | Vinod Kumar Bhardwaj, Archana Dixit, Rita Rani, G. K. Goswami, Anirudh
Pradhan | An Axially Symmetric Transitioning models with Observational Constraints | 19 pages, 10 figures | null | 10.1016/j.cjph.2022.09.007 | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | In this study, we have demonstrated the expansion history of an axially
symmetric Bianchi type-I model of the universe. Our model as of now presents an
accelerating universe, which had been in the decelerating phase in the past.
Roles of the two crucial Hubble~$H(z)$ and deceleration~$q(z)$ parameters are
examined. T... | [
{
"created": "Sat, 9 Apr 2022 11:27:10 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"Bhardwaj",
"Vinod Kumar",
""
],
[
"Dixit",
"Archana",
""
],
[
"Rani",
"Rita",
""
],
[
"Goswami",
"G. K.",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | In this study, we have demonstrated the expansion history of an axially symmetric Bianchi type-I model of the universe. Our model as of now presents an accelerating universe, which had been in the decelerating phase in the past. Roles of the two crucial Hubble~$H(z)$ and deceleration~$q(z)$ parameters are examined. The... |
gr-qc/0106089 | Hans-Juergen Schmidt | H.-J. Schmidt, U. Semmelmann | Cosmic strings and strings in gravitational waves | 13 pages, LaTeX, reprinted from Astron. Nachr. 310 (1989) 103 | null | null | Report UNIPO-MATH-01-JUN-25 | gr-qc | null | We consider strings with the Nambu action as extremal surfaces in a given
space-time, thus, we ignore their back reaction. Especially, we look for
strings sharing one symmetry with the underlying space-time. If this is a
non-null symmetry, the problem of determining the motion of the string can be
dimensionally reduc... | [
{
"created": "Thu, 28 Jun 2001 10:36:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmidt",
"H. -J.",
""
],
[
"Semmelmann",
"U.",
""
]
] | We consider strings with the Nambu action as extremal surfaces in a given space-time, thus, we ignore their back reaction. Especially, we look for strings sharing one symmetry with the underlying space-time. If this is a non-null symmetry, the problem of determining the motion of the string can be dimensionally reduced... |
2006.03946 | Shin'ichi Nojiri | Shin'ichi Nojiri and Sergei D. Odintsov | The dark universe future and singularities: the account of thermal and
quantum effects | LaTeX, 11 pages, to appear in Physics of the Dark Universe | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The knowledge of the universe future is of fundamental importance for any
advanced civilization. We study the future of singular dark universe where
thermal effects due to the Hawking radiation on the apparent horizon of the FRW
universe are taken in consideration. It is shown that dark universe which ends
up at fini... | [
{
"created": "Sat, 6 Jun 2020 19:18:16 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2020 23:01:40 GMT",
"version": "v2"
}
] | 2020-07-27 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | The knowledge of the universe future is of fundamental importance for any advanced civilization. We study the future of singular dark universe where thermal effects due to the Hawking radiation on the apparent horizon of the FRW universe are taken in consideration. It is shown that dark universe which ends up at finite... |
1412.4228 | Ettore Minguzzi | E. Minguzzi | An equivalence of Finslerian relativistic theories | 11 pages. v2: shortened introduction, added references. Changed
title. The previous title was: The definition of Finsler spacetime | Rep. Math. Phys. 77 (2016) 45-55 | 10.1016/S0034-4877(16)30004-0 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Lorentz-Finsler geometry it is natural to define the Finsler Lagrangian
over a cone (Asanov's approach) or over the whole slit tangent bundle (Beem's
approach). In the former case one might want to add differentiability
conditions at the boundary of the (timelike) cone in order to retain the usual
definition of li... | [
{
"created": "Sat, 13 Dec 2014 12:08:06 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2015 14:18:35 GMT",
"version": "v2"
}
] | 2016-06-28 | [
[
"Minguzzi",
"E.",
""
]
] | In Lorentz-Finsler geometry it is natural to define the Finsler Lagrangian over a cone (Asanov's approach) or over the whole slit tangent bundle (Beem's approach). In the former case one might want to add differentiability conditions at the boundary of the (timelike) cone in order to retain the usual definition of ligh... |
1412.1199 | Ahmad Borzou | Ahmad Borzou | A Lorentz Gauge Theory of Gravity | 13 pages, 5 figures, accepted for publication in CQG | Class. Quantum Grav. 33 (2016) 025008 | 10.1088/0264-9381/33/2/025008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a Lorentz gauge theory of gravity in which the metric is not
dynamical. Spherically symmetric weak field solutions are studied. We show that
this solution contains the Schwarzschild spacetime at least to the first order
of perturbation. Next, we present a special case of the theory. It is shown
that the Sc... | [
{
"created": "Wed, 3 Dec 2014 05:47:38 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Apr 2015 16:48:06 GMT",
"version": "v2"
},
{
"created": "Sun, 13 Dec 2015 00:08:55 GMT",
"version": "v3"
}
] | 2016-10-27 | [
[
"Borzou",
"Ahmad",
""
]
] | We present a Lorentz gauge theory of gravity in which the metric is not dynamical. Spherically symmetric weak field solutions are studied. We show that this solution contains the Schwarzschild spacetime at least to the first order of perturbation. Next, we present a special case of the theory. It is shown that the Schw... |
1208.4596 | Kazuhiro Hayama | Kazuhiro Hayama and Atsushi Nishizawa | Model-independent test of gravity with a network of ground-based
gravitational-wave detectors | null | null | 10.1103/PhysRevD.87.062003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of gravitational waves with a global network of
interferometric detectors such as advanced LIGO, advanced Virgo, and KAGRA will
make it possible to probe into the nature of space-time structure. Besides
Einstein's general theory of relativity, there are several theories of
gravitation that passed expe... | [
{
"created": "Wed, 22 Aug 2012 19:55:10 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2013 13:59:16 GMT",
"version": "v2"
}
] | 2015-03-20 | [
[
"Hayama",
"Kazuhiro",
""
],
[
"Nishizawa",
"Atsushi",
""
]
] | The observation of gravitational waves with a global network of interferometric detectors such as advanced LIGO, advanced Virgo, and KAGRA will make it possible to probe into the nature of space-time structure. Besides Einstein's general theory of relativity, there are several theories of gravitation that passed experi... |
1203.2103 | Mubasher Jamil | Mubasher Jamil, D. Momeni, Kazuharu Bamba, Ratbay Myrzakulov | Thermodynamics of a Schwarzschild Black Hole in Phantom Cosmology with
Entropy Corrections | 17 pages, no figure, version accepted for publication in "Int. J.
Mod. Phys. D" | International Journal of Modern Physics D, Vol. 21, (2012) 1250065 | 10.1142/S0218271812500654 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by some earlier works \cite{pavon,sadjadi} dealing with the study
of generalized second law (GSL) of thermodynamics for a system comprising of a
Schwarzschild black accreting a test non-self-gravitating fluid namely phantom
energy in FRW universe, we extend them when the entropy of horizons of black
hole an... | [
{
"created": "Thu, 8 Mar 2012 13:35:02 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2012 05:47:11 GMT",
"version": "v2"
}
] | 2012-07-17 | [
[
"Jamil",
"Mubasher",
""
],
[
"Momeni",
"D.",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | Motivated by some earlier works \cite{pavon,sadjadi} dealing with the study of generalized second law (GSL) of thermodynamics for a system comprising of a Schwarzschild black accreting a test non-self-gravitating fluid namely phantom energy in FRW universe, we extend them when the entropy of horizons of black hole and ... |
1805.06228 | Christian Corda Prof. | Christian Corda | New proof of general relativity through the correct physical
interpretation of the Mossbauer rotor experiment | 7 pages, 1 figure. This Essay received an Honorable Mention in the
2018 Essay Competition of the Gravity Research Foundation. Dedicated to the
memory of Enrico Lista. Founded on the research paper arXiv:1502.04911. arXiv
admin note: substantial text overlap with arXiv:1602.04212 | Int. Journ. Mod. Phys. D 27, 1847016 (2018) | 10.1142/S0218271818470168 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Essay, we give a correct interpretation of a historical experiment by
Kundig on the transverse Doppler shift in a rotating system (Mossbauer rotor
experiment). This experiment has been recently first reanalyzed, and then
replied by an experimental research group. The results of reanalyzing the
experiment have... | [
{
"created": "Wed, 16 May 2018 10:16:14 GMT",
"version": "v1"
},
{
"created": "Thu, 17 May 2018 07:45:05 GMT",
"version": "v2"
}
] | 2018-10-22 | [
[
"Corda",
"Christian",
""
]
] | In this Essay, we give a correct interpretation of a historical experiment by Kundig on the transverse Doppler shift in a rotating system (Mossbauer rotor experiment). This experiment has been recently first reanalyzed, and then replied by an experimental research group. The results of reanalyzing the experiment have s... |
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