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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1708.04588 | S Habib Mazharimousavi | S. Habib Mazharimousavi, M. Halilsoy and S. N. Hamad Amen | Stability of spherically symmetric timelike thin-shells in general
relativity with a variable equation of state | 9 pages, 2 figures; Final version published in Int. J. Mod. Phys. D | Int. J. Mod. Phys. D 26, 1750158 (2017) | 10.1142/S0218271817501589 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study spherically symmetric timelike thin-shells in $3+1-$dimensional bulk
spacetime with a variable equation of state for the fluid presented on the
shell. In such a fluid the angular pressure $p$ is a function of both surface
energy density $\sigma $ and the radius $R$ of the thin-shell. Explicit cases
of the th... | [
{
"created": "Thu, 3 Aug 2017 11:10:30 GMT",
"version": "v1"
}
] | 2018-01-11 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
],
[
"Amen",
"S. N. Hamad",
""
]
] | We study spherically symmetric timelike thin-shells in $3+1-$dimensional bulk spacetime with a variable equation of state for the fluid presented on the shell. In such a fluid the angular pressure $p$ is a function of both surface energy density $\sigma $ and the radius $R$ of the thin-shell. Explicit cases of the thin... |
gr-qc/9404002 | Tevian Dray | Tevian Dray and Charles Hellaby | The Patchwork Divergence Theorem | REVTeX 3.0, 7 pages by default (16 in preprint style), no figures | J.Math.Phys.35:5922-5929,1994 | 10.1063/1.530719 | null | gr-qc dg-ga math.DG | null | The divergence theorem in its usual form applies only to suitably smooth
vector fields. For vector fields which are merely piecewise smooth, as is
natural at a boundary between regions with different physical properties, one
must patch together the divergence theorem applied separately in each region.
We give an eleg... | [
{
"created": "Sat, 2 Apr 1994 15:07:33 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Dray",
"Tevian",
""
],
[
"Hellaby",
"Charles",
""
]
] | The divergence theorem in its usual form applies only to suitably smooth vector fields. For vector fields which are merely piecewise smooth, as is natural at a boundary between regions with different physical properties, one must patch together the divergence theorem applied separately in each region. We give an elegan... |
0812.2768 | Raul Horvat | R. Horvat | Effective field theory, large number of particle species, and holography | 8 pages, minor corrections, a reference added, to appear in PLB | Phys.Lett.B674:1-3,2009 | 10.1016/j.physletb.2009.02.057 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An effective quantum field theory (QFT) with a manifest UV/IR connection, so
as to be valid for arbitrarily large volumes, can successfully be applied to
the cosmological dark energy problem as well as the cosmological constant (CC)
problem. Motivated by recent approaches to the hierarchy problem, we develop
such a f... | [
{
"created": "Mon, 15 Dec 2008 11:30:38 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2009 11:06:48 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Horvat",
"R.",
""
]
] | An effective quantum field theory (QFT) with a manifest UV/IR connection, so as to be valid for arbitrarily large volumes, can successfully be applied to the cosmological dark energy problem as well as the cosmological constant (CC) problem. Motivated by recent approaches to the hierarchy problem, we develop such a fra... |
1009.4540 | Li-Ming Cao | Li-Ming Cao | Deformation of Codimension-2 Surface and Horizon Thermodynamics | Latex, 61 pages, no figures; v2, type errors corrected; v3,
references and comments are added, English is improved, to appear in JHEP | JHEP 1103:112,2011 | 10.1007/JHEP03(2011)112 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The deformation equation of a spacelike submanifold with an arbitrary
codimension is given by a general construction without using local frames. In
the case of codimension-1, this equation reduces to the evolution equation of
the extrinsic curvature of a spacelike hypersurface. In the more interesting
case of codimen... | [
{
"created": "Thu, 23 Sep 2010 08:23:47 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 2010 05:47:32 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Mar 2011 05:58:50 GMT",
"version": "v3"
}
] | 2011-03-31 | [
[
"Cao",
"Li-Ming",
""
]
] | The deformation equation of a spacelike submanifold with an arbitrary codimension is given by a general construction without using local frames. In the case of codimension-1, this equation reduces to the evolution equation of the extrinsic curvature of a spacelike hypersurface. In the more interesting case of codimensi... |
1909.12718 | Wolfgang Kastaun | Wolfgang Kastaun and Frank Ohme | Finite tidal effects in GW170817: Observational evidence or model
assumptions? | 16 pages, 12 figures | Phys. Rev. D 100, 103023 (2019) | 10.1103/PhysRevD.100.103023 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the detection of gravitational waves caused by the coalescence of
compact objects in the mass range of neutron stars, GW170817, several studies
have searched for an imprint of tidal effects in the signal, employing
different model assumptions. One important distinction is whether or not to
assume that both obje... | [
{
"created": "Fri, 27 Sep 2019 14:41:40 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2019 13:32:08 GMT",
"version": "v2"
}
] | 2019-12-02 | [
[
"Kastaun",
"Wolfgang",
""
],
[
"Ohme",
"Frank",
""
]
] | After the detection of gravitational waves caused by the coalescence of compact objects in the mass range of neutron stars, GW170817, several studies have searched for an imprint of tidal effects in the signal, employing different model assumptions. One important distinction is whether or not to assume that both object... |
2207.08290 | Thomas Thiemann | T. Thiemann, E.-A. Zwicknagel | Hamiltonian renormalisation VI: Parametrised field theory on the
cylinder | 39p, no figures | null | null | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hamiltonian Renormalisation, as defined within this series of works, was
derived from covariant Wilson renormalisation via Osterwalder-Schrader
reconstruction. As such it directly applies to QFT with a true (physical)
Hamiltonian bounded from below. The validity of the scheme was positively
tested for free QFT in any... | [
{
"created": "Sun, 17 Jul 2022 21:11:06 GMT",
"version": "v1"
}
] | 2022-07-19 | [
[
"Thiemann",
"T.",
""
],
[
"Zwicknagel",
"E. -A.",
""
]
] | Hamiltonian Renormalisation, as defined within this series of works, was derived from covariant Wilson renormalisation via Osterwalder-Schrader reconstruction. As such it directly applies to QFT with a true (physical) Hamiltonian bounded from below. The validity of the scheme was positively tested for free QFT in any d... |
gr-qc/9511002 | Mike Clayton | Eduard Prugovecki | Quantum Geometry and Gravity | Converted from a Mac-Word file to PostScript. The Author may be
reached at: prugov@math.utoronto.ca | Appeared in `Quantum Gravity', Eds. P.G.Bergmann, and V.de Sabbata
and H.-J.Treder (World Scientific, Singapore, 1996), pp. 276-302 | null | null | gr-qc hep-th | null | The geometro-stochastic method of quantization provides a framework for
quantum general relativity, in which the principal frame bundles of local
Lorentz frames that underlie the fibre-theoretical approach to classical
general relativity are replaced by Poincar\'e-covariant quantum frame bundles.
In the semiclassical... | [
{
"created": "Wed, 1 Nov 1995 16:01:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Prugovecki",
"Eduard",
""
]
] | The geometro-stochastic method of quantization provides a framework for quantum general relativity, in which the principal frame bundles of local Lorentz frames that underlie the fibre-theoretical approach to classical general relativity are replaced by Poincar\'e-covariant quantum frame bundles. In the semiclassical r... |
1808.03484 | Konstantinos Dialektopoulos F. | Konstantinos F. Dialektopoulos and Salvatore Capozziello | Noether Symmetries as a geometric criterion to select theories of
gravity | 16 pages, accepted for publication in the International Journal of
Geometric Methods in Modern Physics | null | 10.1142/S0219887818400078 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the {\it Noether Symmetry Approach} as a geometric criterion to
select theories of gravity. Specifically, we deal with Noether Symmetries to
solve the field equations of given gravity theories. The method allows to find
out exact solutions, but also to constrain arbitrary functions in the action.
Specific c... | [
{
"created": "Fri, 10 Aug 2018 10:57:14 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Sep 2018 09:58:34 GMT",
"version": "v2"
}
] | 2018-09-25 | [
[
"Dialektopoulos",
"Konstantinos F.",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We review the {\it Noether Symmetry Approach} as a geometric criterion to select theories of gravity. Specifically, we deal with Noether Symmetries to solve the field equations of given gravity theories. The method allows to find out exact solutions, but also to constrain arbitrary functions in the action. Specific cos... |
0808.1041 | Vladimir Khatsymovsky | V.M. Khatsymovsky | Independent 4-tetrahedra connection representation of Regge calculus | 9 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider simplest piecewise flat manifold consisting of two identical
4-tetrahedra (call it bisimplex). General relativity action for arbitrary
piecewise flat manifold can be expressed in terms of sum of the (half of)
bisimplex actions. We use representation of each bisimplex action in terms of
certain rotation ma... | [
{
"created": "Thu, 7 Aug 2008 15:08:20 GMT",
"version": "v1"
}
] | 2008-10-09 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | We consider simplest piecewise flat manifold consisting of two identical 4-tetrahedra (call it bisimplex). General relativity action for arbitrary piecewise flat manifold can be expressed in terms of sum of the (half of) bisimplex actions. We use representation of each bisimplex action in terms of certain rotation matr... |
2407.00547 | Jhonny Andres Agudelo Ruiz J. A. Agudelo Ruiz | Jhonny A. A. Ruiz and A. F. Santos | Exploring regular black holes within the framework of the TFD formalism | 14 pages, 2 figures | null | null | null | gr-qc hep-th math-ph math.MP quant-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, a massive scalar field non-minimally coupled with gravity is
considered. Assuming a regular and spherically symmetric background,
specifically a regular black hole solution, the energy-momentum tensor is
calculated. Using the Thermo Field Dynamics (TFD) formalism and its topological
structure, the corr... | [
{
"created": "Sat, 29 Jun 2024 23:49:12 GMT",
"version": "v1"
}
] | 2024-07-02 | [
[
"Ruiz",
"Jhonny A. A.",
""
],
[
"Santos",
"A. F.",
""
]
] | In this paper, a massive scalar field non-minimally coupled with gravity is considered. Assuming a regular and spherically symmetric background, specifically a regular black hole solution, the energy-momentum tensor is calculated. Using the Thermo Field Dynamics (TFD) formalism and its topological structure, the corres... |
0810.4493 | Gregory B. Cook | Gregory B. Cook and Thomas W. Baumgarte | Excision boundary conditions for the conformal metric | 10 pages, revtex4, accepted by Physical Review D | Phys.Rev.D78:104016,2008 | 10.1103/PhysRevD.78.104016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Shibata, Ury\=u and Friedman recently suggested a new decomposition of
Einstein's equations that is useful for constructing initial data. In contrast
to previous decompositions, the conformal metric is no longer treated as a
freely-specifiable variable, but rather is determined as a solution to the
field equations. T... | [
{
"created": "Fri, 24 Oct 2008 19:15:05 GMT",
"version": "v1"
}
] | 2009-02-23 | [
[
"Cook",
"Gregory B.",
""
],
[
"Baumgarte",
"Thomas W.",
""
]
] | Shibata, Ury\=u and Friedman recently suggested a new decomposition of Einstein's equations that is useful for constructing initial data. In contrast to previous decompositions, the conformal metric is no longer treated as a freely-specifiable variable, but rather is determined as a solution to the field equations. The... |
2211.01880 | Jie Feng | Junjie Luo, Jie Feng, Hong-Hao Zhang, and Weipeng Lin | Performance of different correction maps in the extended phase-space
method for spinning compact binaries | null | null | 10.1093/mnras/stac3494 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Since the first detection of gravitational waves by the LIGO/VIRGO team, the
related research field has attracted more attention. The spinning compact
binaries system, as one of the gravitational-wave sources for broadband laser
interferometers, has been widely studied by related researchers. In order to
analyze the ... | [
{
"created": "Thu, 3 Nov 2022 15:11:08 GMT",
"version": "v1"
}
] | 2022-12-21 | [
[
"Luo",
"Junjie",
""
],
[
"Feng",
"Jie",
""
],
[
"Zhang",
"Hong-Hao",
""
],
[
"Lin",
"Weipeng",
""
]
] | Since the first detection of gravitational waves by the LIGO/VIRGO team, the related research field has attracted more attention. The spinning compact binaries system, as one of the gravitational-wave sources for broadband laser interferometers, has been widely studied by related researchers. In order to analyze the gr... |
gr-qc/9710094 | Stu Shapiro | S. L. Shapiro | Binary-Induced Gravitational Collapse: A Trivial Example | 7 pages, 5 figures, RevTeX, to appear in Phys. Rev. D, Jan 15 1998 | Phys.Rev. D57 (1998) 908-913 | 10.1103/PhysRevD.57.908 | null | gr-qc astro-ph | null | We present a simple model illustrating how a highly relativistic, compact
object which is stable in isolation can be driven dynamically unstable by the
tidal field of a binary companion. Our compact object consists of a
test-particle in a relativistic orbit about a black hole; the binary companion
is a distant point ... | [
{
"created": "Mon, 20 Oct 1997 20:28:55 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Shapiro",
"S. L.",
""
]
] | We present a simple model illustrating how a highly relativistic, compact object which is stable in isolation can be driven dynamically unstable by the tidal field of a binary companion. Our compact object consists of a test-particle in a relativistic orbit about a black hole; the binary companion is a distant point ma... |
2211.08964 | Fabrizio De Marchi | Fabrizio De Marchi, Gael Cascioli, Todd Ely, Luciano Iess, Eric A.
Burt, Scott Hensley, Erwan Mazarico | Testing the gravitational redshift with an inner Solar System probe: the
VERITAS case | 15 pages, 9 figures | null | 10.1103/PhysRevD.107.064032 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The NASA Discovery-class mission VERITAS, selected in June 2021, will be
launched towards Venus after 2027. In addition to the science instrumentation
that will build global foundational geophysical datasets, VERITAS proposed to
conduct a technology demonstration for the Deep Space Atomic Clock (DSAC-2). A
first DSAC... | [
{
"created": "Wed, 16 Nov 2022 15:16:41 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2023 14:58:36 GMT",
"version": "v2"
}
] | 2023-03-29 | [
[
"De Marchi",
"Fabrizio",
""
],
[
"Cascioli",
"Gael",
""
],
[
"Ely",
"Todd",
""
],
[
"Iess",
"Luciano",
""
],
[
"Burt",
"Eric A.",
""
],
[
"Hensley",
"Scott",
""
],
[
"Mazarico",
"Erwan",
""
]
] | The NASA Discovery-class mission VERITAS, selected in June 2021, will be launched towards Venus after 2027. In addition to the science instrumentation that will build global foundational geophysical datasets, VERITAS proposed to conduct a technology demonstration for the Deep Space Atomic Clock (DSAC-2). A first DSAC s... |
1006.2234 | Wen-Biao Han | Wen-Biao Han | Revised research about chaotic dynamics in Manko et al. spacetime | 6 pages, 5 figures | Phys.Rev.D77:123007,2008 | 10.1103/PhysRevD.77.123007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent work by Dubeibe et al. [Phys. Rev. D 75, 023008 (2007)] stated that
chaos phenomenon of test particles in gravitational field of rotating neutron
stars which are described by Manko, Sanabria-Gomez, and Manko (Manko et al.)
metric can only occur when the stars have oblate deformation. But the chaotic
motions ... | [
{
"created": "Fri, 11 Jun 2010 08:42:15 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Han",
"Wen-Biao",
""
]
] | A recent work by Dubeibe et al. [Phys. Rev. D 75, 023008 (2007)] stated that chaos phenomenon of test particles in gravitational field of rotating neutron stars which are described by Manko, Sanabria-Gomez, and Manko (Manko et al.) metric can only occur when the stars have oblate deformation. But the chaotic motions th... |
1404.6977 | Dirk Puetzfeld | Yuri N. Obukhov, Dirk Puetzfeld | Equations of motion in scalar-tensor theories of gravity: A covariant
multipolar approach | 5 pages, RevTex format | Phys. Rev. D 90 (2014) 104041 | 10.1103/PhysRevD.90.104041 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the dynamics of extended test bodies for a large class of
scalar-tensor theories of gravitation. A covariant multipolar
Mathisson-Papapetrou-Dixon type of approach is used to derive the equations of
motion in a systematic way for both Jordan and Einstein formulations of these
theories. The results obtained... | [
{
"created": "Mon, 28 Apr 2014 13:47:19 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Nov 2014 13:21:59 GMT",
"version": "v2"
}
] | 2014-11-27 | [
[
"Obukhov",
"Yuri N.",
""
],
[
"Puetzfeld",
"Dirk",
""
]
] | We discuss the dynamics of extended test bodies for a large class of scalar-tensor theories of gravitation. A covariant multipolar Mathisson-Papapetrou-Dixon type of approach is used to derive the equations of motion in a systematic way for both Jordan and Einstein formulations of these theories. The results obtained p... |
1802.05947 | Christof Wetterich | C. Wetterich | Infrared limit of quantum gravity | new references, 9 pages , 3 figures | Phys. Rev. D 98, 026028 (2018) | 10.1103/PhysRevD.98.026028 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the infrared limit of quantum gravity in presence of a
cosmological constant or effective potential for scalar fields. For a positive
effective scalar potential, one-loop perturbation theory around flat space is
divergent due to an instability of the graviton propagator. Functional
renormalization solves t... | [
{
"created": "Fri, 16 Feb 2018 14:29:20 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2018 16:17:16 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Wetterich",
"C.",
""
]
] | We explore the infrared limit of quantum gravity in presence of a cosmological constant or effective potential for scalar fields. For a positive effective scalar potential, one-loop perturbation theory around flat space is divergent due to an instability of the graviton propagator. Functional renormalization solves thi... |
gr-qc/9903087 | Emulsion-Lab | S. Q. Wu and X. Cai | Four Quantum Conservation Laws on Black Hole Equilibrium Radiation
Process and Quantum Black Hole Entropy | 10 Pages, in Latex, no figure | null | null | null | gr-qc | null | The classical first law of thermodynamic for Kerr-Newmann black hole (KNBH)
is generalized to that in quantum form on event horizon. Then four quantum
conservation laws on the KNBH equilibrium radiation process are derived, and
Bekenstein-Hawking's relation S=A/4 is recovered. It can be argued that the
classical entr... | [
{
"created": "Tue, 23 Mar 1999 12:42:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wu",
"S. Q.",
""
],
[
"Cai",
"X.",
""
]
] | The classical first law of thermodynamic for Kerr-Newmann black hole (KNBH) is generalized to that in quantum form on event horizon. Then four quantum conservation laws on the KNBH equilibrium radiation process are derived, and Bekenstein-Hawking's relation S=A/4 is recovered. It can be argued that the classical entrop... |
1511.05450 | Cl\'audio Nassif Cruz | Claudio Nassif and A. C. Amaro de Faria Jr | Unruh effect as foundation of universal gravitation within the
cosmological scenario | 5 pages, 1 figure | Canadian Journal of Physics 94, 209 (2016) | 10.1139/cjp-2015-0668 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We aim to build a simple model of a gas with temperature ($T$) in thermal
equilibrium with a black-body that plays the role of the adiabatically
expanding universe, so that each particle of such a gas mimics a kind of
"particle" (quantum) of dark energy, which is inside a very small area of space
so-called Planck are... | [
{
"created": "Mon, 16 Nov 2015 14:17:52 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Nov 2016 11:00:53 GMT",
"version": "v2"
}
] | 2016-11-07 | [
[
"Nassif",
"Claudio",
""
],
[
"Faria",
"A. C. Amaro de",
"Jr"
]
] | We aim to build a simple model of a gas with temperature ($T$) in thermal equilibrium with a black-body that plays the role of the adiabatically expanding universe, so that each particle of such a gas mimics a kind of "particle" (quantum) of dark energy, which is inside a very small area of space so-called Planck area ... |
gr-qc/9906072 | Heller Michal | M. Heller, W. Sasin | Nonlocal Phenomena from Noncommutative Pre-Planckian Regime | 9 pages, LaTex, no figures | null | null | CGC-99-3 | gr-qc | null | A model unifying general relativity with quantum mechanics is further
developed. It is based on a noncommutative geometry which supposedly modelled
the universe in its pre-Planckian epoch. The geometry is totally nonlocal with
no time and no space in their usual meaning. They emerge only in the transition
process fro... | [
{
"created": "Thu, 17 Jun 1999 10:27:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Heller",
"M.",
""
],
[
"Sasin",
"W.",
""
]
] | A model unifying general relativity with quantum mechanics is further developed. It is based on a noncommutative geometry which supposedly modelled the universe in its pre-Planckian epoch. The geometry is totally nonlocal with no time and no space in their usual meaning. They emerge only in the transition process from ... |
2003.09610 | Jose Navarro-Salas | Antonio Ferreiro, Jose Navarro-Salas and Silvia Pla | R-summed form of adiabatic expansions in curved spacetime | 13 pages. Minor changes. Misprints corrected. To appear in Phys. Rev.
D | Phys. Rev. D 101, 105011 (2020) | 10.1103/PhysRevD.101.105011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Feynman propagator in curved spacetime admits an asymptotic
(Schwinger-DeWitt) series expansion in derivatives of the metric. Remarkably,
all terms in the series containing the Ricci scalar R can be summed exactly. We
show that this (non-perturbative) property of the Schwinger-DeWitt series has a
natural and equi... | [
{
"created": "Sat, 21 Mar 2020 09:22:20 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2020 11:47:49 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"Ferreiro",
"Antonio",
""
],
[
"Navarro-Salas",
"Jose",
""
],
[
"Pla",
"Silvia",
""
]
] | The Feynman propagator in curved spacetime admits an asymptotic (Schwinger-DeWitt) series expansion in derivatives of the metric. Remarkably, all terms in the series containing the Ricci scalar R can be summed exactly. We show that this (non-perturbative) property of the Schwinger-DeWitt series has a natural and equiva... |
1901.11214 | Bogeun Gwak | Yongwan Gim and Bogeun Gwak | Charged Particle and Strong Cosmic Censorship in
Reissner-Nordstr\"{o}m-de Sitter Black Holes | 17 pages, 4 figures, published in PRD | Phys. Rev. D 100, 124001 (2019) | 10.1103/PhysRevD.100.124001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the instability of the unstable circular orbit of a charged
null particle to test the strong cosmic censorship conjecture in Nariai-type
near-extremal Reissner--Nordstr\"{o}m--de Sitter black holes. The instability
is estimated as the Lyapunov exponent and found to depend on the mass and
charge of the ... | [
{
"created": "Thu, 31 Jan 2019 05:13:58 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Dec 2019 14:55:55 GMT",
"version": "v2"
}
] | 2019-12-11 | [
[
"Gim",
"Yongwan",
""
],
[
"Gwak",
"Bogeun",
""
]
] | We investigate the instability of the unstable circular orbit of a charged null particle to test the strong cosmic censorship conjecture in Nariai-type near-extremal Reissner--Nordstr\"{o}m--de Sitter black holes. The instability is estimated as the Lyapunov exponent and found to depend on the mass and charge of the bl... |
1603.04652 | Chris Clarkson | Chris Clarkson | Roulettes: A weak lensing formalism for strong lensing - II. Derivation
and analysis | 25 pages, 9 pages. v3 has minor changes to match published version.
Paper I available at arXiv:1603.04698 | Class. Quantum Grav. 33 245003 (2016) | 10.1088/0264-9381/33/24/245003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new extension of the weak lensing formalism capable of
describing strongly lensed images. This paper accompanies Paper I,
arXiv:1603.04698 where we provided a condensed overview of the approach and
illustrated how it works. Here we give all the necessary details, together with
some more explicit examples... | [
{
"created": "Tue, 15 Mar 2016 12:06:18 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2016 13:22:55 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Nov 2016 17:21:14 GMT",
"version": "v3"
}
] | 2016-11-15 | [
[
"Clarkson",
"Chris",
""
]
] | We present a new extension of the weak lensing formalism capable of describing strongly lensed images. This paper accompanies Paper I, arXiv:1603.04698 where we provided a condensed overview of the approach and illustrated how it works. Here we give all the necessary details, together with some more explicit examples. ... |
1403.5009 | Joao Rafael Lucio dos Santos | P. H. R. S. Moraes and J. R. L. Santos | Two scalar field cosmology from coupled one-field models | 8 pages, 6 figures | null | 10.1103/PhysRevD.89.083516 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One possible description for the current accelerated expansion of the
universe is quintessence dynamics. The basic idea of quintessence consists of
analyzing cosmological scenarios driven by scalar fields. In this work we
present some interesting features on the cosmological scenario obtained from
the solutions of an... | [
{
"created": "Thu, 20 Mar 2014 00:31:10 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2014 14:08:57 GMT",
"version": "v2"
}
] | 2014-04-10 | [
[
"Moraes",
"P. H. R. S.",
""
],
[
"Santos",
"J. R. L.",
""
]
] | One possible description for the current accelerated expansion of the universe is quintessence dynamics. The basic idea of quintessence consists of analyzing cosmological scenarios driven by scalar fields. In this work we present some interesting features on the cosmological scenario obtained from the solutions of an e... |
1809.09874 | Beatriz Elizaga Navascu\'es | Beatriz Elizaga Navascu\'es, Daniel Mart\'in de Blas, Guillermo A.
Mena Marug\'an | The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum
Cosmology | 29 pages, 13 figures | Universe 2018, 4(10), 98 | 10.3390/universe4100098 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the role played by the vacuum of the primordial fluctuations
in hybrid Loop Quantum Cosmology. We consider scenarios where the inflaton
potential is a mass term and the unperturbed quantum geometry is governed by
the effective dynamics of Loop Quantum Cosmology. In this situation, the
phenomenologicall... | [
{
"created": "Wed, 26 Sep 2018 09:42:04 GMT",
"version": "v1"
}
] | 2018-09-27 | [
[
"Navascués",
"Beatriz Elizaga",
""
],
[
"de Blas",
"Daniel Martín",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
]
] | We investigate the role played by the vacuum of the primordial fluctuations in hybrid Loop Quantum Cosmology. We consider scenarios where the inflaton potential is a mass term and the unperturbed quantum geometry is governed by the effective dynamics of Loop Quantum Cosmology. In this situation, the phenomenologically ... |
gr-qc/9711014 | Henrique Oliveira | H. P. de Oliveira, I. Damiao Soares and T. J. Stuchi | Chaotic exit to inflation: the dynamics of pre-inflationary universes | 3 pages, Latex (mprocl.sty), 4 figures. To appear in the proceedings
of the Eighth Marcel Grossmann Meeting, Jerusalem, June 1997 | null | null | null | gr-qc | null | We show that anisotropic Bianchi type-IX models, with matter and cosmological
constant have chaotic dynamics, connected to the presence of a saddle-center in
phase space. The topology of cylinders emanating from unstable periodic orbits
about the saddle-center provides an invariant characterization of chaos in the
mo... | [
{
"created": "Wed, 5 Nov 1997 15:42:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Oliveira",
"H. P.",
""
],
[
"Soares",
"I. Damiao",
""
],
[
"Stuchi",
"T. J.",
""
]
] | We show that anisotropic Bianchi type-IX models, with matter and cosmological constant have chaotic dynamics, connected to the presence of a saddle-center in phase space. The topology of cylinders emanating from unstable periodic orbits about the saddle-center provides an invariant characterization of chaos in the mode... |
1201.2959 | Ruslan Vaulin | Rahul Biswas, Patrick R. Brady, Jordi Burguet-Castell, Kipp Cannon,
Jessica Clayton, Alexander Dietz, Nickolas Fotopoulos, Lisa M. Goggin, Drew
Keppel, Chris Pankow, Larry R. Price and Ruslan Vaulin | Likelihood-ratio ranking of gravitational-wave candidates in a
non-Gaussian background | 10 pages, 6 figures | null | 10.1103/PhysRevD.85.122008 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a general approach to detection of transient gravitational-wave
signals in the presence of non-Gaussian background noise. We prove that under
quite general conditions, the ratio of the likelihood of observed data to
contain a signal to the likelihood of it being a noise fluctuation provides
optimal rankin... | [
{
"created": "Fri, 13 Jan 2012 21:40:32 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jan 2012 04:44:37 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Biswas",
"Rahul",
""
],
[
"Brady",
"Patrick R.",
""
],
[
"Burguet-Castell",
"Jordi",
""
],
[
"Cannon",
"Kipp",
""
],
[
"Clayton",
"Jessica",
""
],
[
"Dietz",
"Alexander",
""
],
[
"Fotopoulos",
"Nickolas",
... | We describe a general approach to detection of transient gravitational-wave signals in the presence of non-Gaussian background noise. We prove that under quite general conditions, the ratio of the likelihood of observed data to contain a signal to the likelihood of it being a noise fluctuation provides optimal ranking ... |
2204.05414 | Sergi Nadal-Gisbert | Pau Beltr\'an-Palau, Sergi Nadal-Gisbert, Jos\'e Navarro-Salas and
Silvia Pla | Hadamard and boundary conditions for the Big Bang quantum vacuum | 17 pages. 2 figures. New title. To appear in the proceedings of
"Avenues of Quantum Field Theory in Curved Spacetime" | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | General relativity predicts final-type singularities inside black holes, as
well as a cosmological initial-type singularity. Cosmic censorship protects
external observers from black hole singularities, while Penrose's Weyl
curvature hypothesis protects the smoothness of the initial (Big Bang)
singularity. We discuss ... | [
{
"created": "Mon, 11 Apr 2022 21:15:02 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2023 17:47:54 GMT",
"version": "v2"
}
] | 2023-06-16 | [
[
"Beltrán-Palau",
"Pau",
""
],
[
"Nadal-Gisbert",
"Sergi",
""
],
[
"Navarro-Salas",
"José",
""
],
[
"Pla",
"Silvia",
""
]
] | General relativity predicts final-type singularities inside black holes, as well as a cosmological initial-type singularity. Cosmic censorship protects external observers from black hole singularities, while Penrose's Weyl curvature hypothesis protects the smoothness of the initial (Big Bang) singularity. We discuss a ... |
1709.03463 | Ramon Herrera | Carlos Gonzalez and Ramon Herrera | Intermediate inflation into generalized induced-gravity scenario | 14 pages, 1 figure. Accepted for publication in Eur.Phys.J. C | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An intermediate inflationary universe model within the context of
non-minimally coupled to the scalar curvature is analyzed. We will conduct our
analysis under the slow roll approximation of the inflationary dynamics and the
cosmological perturbations considering a coupling of the form
$F(\varphi)=\kappa+\xi_n\varphi... | [
{
"created": "Mon, 11 Sep 2017 16:17:51 GMT",
"version": "v1"
}
] | 2017-09-12 | [
[
"Gonzalez",
"Carlos",
""
],
[
"Herrera",
"Ramon",
""
]
] | An intermediate inflationary universe model within the context of non-minimally coupled to the scalar curvature is analyzed. We will conduct our analysis under the slow roll approximation of the inflationary dynamics and the cosmological perturbations considering a coupling of the form $F(\varphi)=\kappa+\xi_n\varphi^n... |
2406.09176 | Madhavan Varadarajan | Madhavan Varadarajan | Spherical collapse and black hole evaporation | 24 pages, 3 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider spherically symmetric gravity coupled to a spherically symmetric
scalar field with a specific coupling which depends on the Areal Radius.
Classical collapse is described by the Vaidya solution. The semiclassical
Einstein equations are well defined. Their solution describes an evaporating
black hole. A bal... | [
{
"created": "Thu, 13 Jun 2024 14:37:33 GMT",
"version": "v1"
}
] | 2024-06-14 | [
[
"Varadarajan",
"Madhavan",
""
]
] | We consider spherically symmetric gravity coupled to a spherically symmetric scalar field with a specific coupling which depends on the Areal Radius. Classical collapse is described by the Vaidya solution. The semiclassical Einstein equations are well defined. Their solution describes an evaporating black hole. A balan... |
1505.03958 | Kiyoshi Shiraishi | Kiyoshi Shiraishi and Takuya Maki | Vacuum polarization around a three-dimensional black hole | 6 pages, 1 figure. typos fixed | Classical and Quantum Gravity 11, No. 3, pp.695-699, 1994 | 10.1088/0264-9381/11/3/019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the Euclidean propagator for a conformally coupled massless
scalar field in the background of the three-dimensional black hole. The
expectation value $\langle\varphi^2\rangle$ in the Hartle-Hawking state is
obtained in the spacetime.
| [
{
"created": "Fri, 15 May 2015 04:36:06 GMT",
"version": "v1"
},
{
"created": "Fri, 8 May 2020 04:31:50 GMT",
"version": "v2"
}
] | 2020-05-11 | [
[
"Shiraishi",
"Kiyoshi",
""
],
[
"Maki",
"Takuya",
""
]
] | We calculate the Euclidean propagator for a conformally coupled massless scalar field in the background of the three-dimensional black hole. The expectation value $\langle\varphi^2\rangle$ in the Hartle-Hawking state is obtained in the spacetime. |
1506.04984 | Giampiero Esposito Dr. | Donato Bini, Giampiero Esposito | Is there a quantum gravity effect on the cosmic microwave background
power spectrum? | 4 pages, prepared for the AT1 Session of MG14 in Rome | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An assessment is made of recent attempts to evaluate how quantum gravity may
affect the anisotropy spectrum of the cosmic microwave background. A
perturbative scheme for the solution of the Wheeler-DeWitt equation has been
found to allow for enhancement of power at large scales, whereas the
alternative predicts a sup... | [
{
"created": "Tue, 16 Jun 2015 14:19:47 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Bini",
"Donato",
""
],
[
"Esposito",
"Giampiero",
""
]
] | An assessment is made of recent attempts to evaluate how quantum gravity may affect the anisotropy spectrum of the cosmic microwave background. A perturbative scheme for the solution of the Wheeler-DeWitt equation has been found to allow for enhancement of power at large scales, whereas the alternative predicts a suppr... |
2405.14692 | Abhishek Mehta | Abhishek Kumar Mehta | Necessity of Quantizable Geometry for Quantum Gravity | 12 pages, 3 figures, Added my grant number in the acknowledgement | Class. Quantum Grav. 41 13LT01 (2024) | 10.1088/1361-6382/ad4fda | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, Dirac Quantization of $3D$ gravity in the first-order
formalism is attempted where instead of quantizing the connection and triad
fields, the connection and the triad 1-forms themselves are quantized. The
exterior derivative operator on the space of differential forms is treated as
the `time' derivativ... | [
{
"created": "Thu, 23 May 2024 15:29:12 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2024 05:03:23 GMT",
"version": "v2"
}
] | 2024-06-11 | [
[
"Mehta",
"Abhishek Kumar",
""
]
] | In this paper, Dirac Quantization of $3D$ gravity in the first-order formalism is attempted where instead of quantizing the connection and triad fields, the connection and the triad 1-forms themselves are quantized. The exterior derivative operator on the space of differential forms is treated as the `time' derivative ... |
gr-qc/0310084 | Jiri Podolsky | Jiri Podolsky, Otakar Svitek | Some high-frequency gravitational waves related to exact radiative
spacetimes | 14 pages, to appear in Gen. Relativ. Gravit | Gen.Rel.Grav. 36 (2004) 387-401 | 10.1023/B:GERG.0000010483.02257.90 | null | gr-qc | null | A formalism is introduced which may describe both standard linearized waves
and gravitational waves in Isaacson's high-frequency limit. After emphasizing
main differences between the two approximation techniques we generalize the
Isaacson method to non-vacuum spacetimes. Then we present three large explicit
classes o... | [
{
"created": "Thu, 16 Oct 2003 14:31:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Podolsky",
"Jiri",
""
],
[
"Svitek",
"Otakar",
""
]
] | A formalism is introduced which may describe both standard linearized waves and gravitational waves in Isaacson's high-frequency limit. After emphasizing main differences between the two approximation techniques we generalize the Isaacson method to non-vacuum spacetimes. Then we present three large explicit classes of ... |
gr-qc/9611034 | Alejandro Corichi | Alejandro Corichi and Jose A. Zapata (Penn State) | On diffeomorphism invariance for lattice theories | 11 Pages, Revtex, 3 figures | Nucl.Phys. B493 (1997) 475-490 | 10.1016/S0550-3213(97)00141-7 | CGPG-96/11-02 | gr-qc | null | We consider the role of the diffeomorphism constraint in the quantization of
lattice formulations of diffeomorphism invariant theories of connections. It
has been argued that in working with abstract lattices, one automatically takes
care of the diffeomorphism constraint in the quantum theory. We use two systems
in o... | [
{
"created": "Wed, 13 Nov 1996 00:37:57 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Corichi",
"Alejandro",
"",
"Penn State"
],
[
"Zapata",
"Jose A.",
"",
"Penn State"
]
] | We consider the role of the diffeomorphism constraint in the quantization of lattice formulations of diffeomorphism invariant theories of connections. It has been argued that in working with abstract lattices, one automatically takes care of the diffeomorphism constraint in the quantum theory. We use two systems in ord... |
1610.05628 | Mikhail Katanaev | M. O. Katanaev | Killing vector fields and a homogeneous isotropic universe | 23 pages | Phys.Usp.59:689-700,2016; Usp.Fiz.Nauk 186:763-775,2016 | 10.3367/UFNe.2016.05.037808 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some basic theorems on Killing vector fields are reviewed. In particular, the
topic of a constant-curvature space is examined. A detailed proof is given for
a theorem describing the most general form of the metric of a homogeneous
isotropic space-time. Although this theorem can be considered to be commonly
known, its... | [
{
"created": "Wed, 12 Oct 2016 05:54:33 GMT",
"version": "v1"
}
] | 2016-10-19 | [
[
"Katanaev",
"M. O.",
""
]
] | Some basic theorems on Killing vector fields are reviewed. In particular, the topic of a constant-curvature space is examined. A detailed proof is given for a theorem describing the most general form of the metric of a homogeneous isotropic space-time. Although this theorem can be considered to be commonly known, its c... |
2201.08705 | Salvatore Capozziello | Salvatore Capozziello, Carlo Alberto Mantica, and Luca Guido Molinari | Geometric Perfect Fluids from Extended Gravity | 7 pages, accepted for publication in Europhysics Letters | null | 10.1209/0295-5075/ac525d | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A main issue in cosmology and astrophysics is whether the dark sector
phenomenology originates from particle physics, then requiring the detection of
new fundamental components, or it can be addressed by modifying General
Relativity. Extended Theories of Gravity are possible candidates aimed in
framing dark energy an... | [
{
"created": "Fri, 21 Jan 2022 14:01:24 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Feb 2022 14:47:21 GMT",
"version": "v2"
}
] | 2022-02-22 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Mantica",
"Carlo Alberto",
""
],
[
"Molinari",
"Luca Guido",
""
]
] | A main issue in cosmology and astrophysics is whether the dark sector phenomenology originates from particle physics, then requiring the detection of new fundamental components, or it can be addressed by modifying General Relativity. Extended Theories of Gravity are possible candidates aimed in framing dark energy and ... |
gr-qc/0011090 | Vladimir Mashkevich | Vladimir S. Mashkevich (Queens College, The City University of New
York) | Unboundable Spacetimes with Metric Singularities and Matching Metrics
and Geodesics: A Black-White Hole and a Big Crunch-Bang | 17 pages, LATEX 2e | null | null | null | gr-qc | null | Singularity theorems of general relativity utilize the notion of causal
geodesic incompleteness as a criterion of the presence of a spacetime
singularity. The incompleteness of a causal curve implies the end and/or
beginning of the existence of a particle, which is an event. In the commonly
accepted approach, singula... | [
{
"created": "Sat, 25 Nov 2000 04:02:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mashkevich",
"Vladimir S.",
"",
"Queens College, The City University of New\n York"
]
] | Singularity theorems of general relativity utilize the notion of causal geodesic incompleteness as a criterion of the presence of a spacetime singularity. The incompleteness of a causal curve implies the end and/or beginning of the existence of a particle, which is an event. In the commonly accepted approach, singulari... |
0811.1643 | Seokcheon Lee | Seokcheon Lee | Anisotropy due to Brans-Dicke Theory | 8 pages, 8 figures | null | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the viscous Bianchi type-I metric of the Kasner form is
not able to describe an anisotropic universe, which satisfies the second law of
thermodynamics and the dominant energy condition in Einstein's theory of
gravity. We investigate this problem in Brans-Dicke theory of gravity using the
Bianchi... | [
{
"created": "Tue, 11 Nov 2008 07:45:02 GMT",
"version": "v1"
}
] | 2008-11-12 | [
[
"Lee",
"Seokcheon",
""
]
] | It is well known that the viscous Bianchi type-I metric of the Kasner form is not able to describe an anisotropic universe, which satisfies the second law of thermodynamics and the dominant energy condition in Einstein's theory of gravity. We investigate this problem in Brans-Dicke theory of gravity using the Bianchi t... |
gr-qc/9801083 | Yasuhide Sota | Y. Sota (1), T. Kobayashi (1), K. Maeda (1), T. Kurokawa (2), M.
Morikawa (2) and A. Nakamichi (3) ((1) Waseda University, (2) Ochanomizu
University, (3) Gunma Astronomical Observatory) | Renormalization Group Approach in Newtonian Cosmology | 21 pages, LaTeX, 7 jpeg-figures, submitted to Phys. Rev. D | Phys.Rev. D58 (1998) 043502 | 10.1103/PhysRevD.58.043502 | null | gr-qc astro-ph | null | We apply the renormalization group (RG) method to examine the observable
scaling properties in Newtonian cosmology. The original scaling properties of
the equations of motion in our model are modified for averaged observables on
constant time slices. In the RG flow diagram, we find three robust fixed
points: Einstein... | [
{
"created": "Sun, 25 Jan 1998 07:12:56 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 1998 10:49:59 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Sota",
"Y.",
""
],
[
"Kobayashi",
"T.",
""
],
[
"Maeda",
"K.",
""
],
[
"Kurokawa",
"T.",
""
],
[
"Morikawa",
"M.",
""
],
[
"Nakamichi",
"A.",
""
]
] | We apply the renormalization group (RG) method to examine the observable scaling properties in Newtonian cosmology. The original scaling properties of the equations of motion in our model are modified for averaged observables on constant time slices. In the RG flow diagram, we find three robust fixed points: Einstein-d... |
1006.4252 | Lidya Susam | M.Arik, L. Amon Susam | Radiation Dominated Universe for Jordan-Brans-Dicke Cosmology | null | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Jordan-Brans-Dicke cosmology with a standard kinetic term for the scalar
field and no mass term has the same radiation dominated solution as standard
Einstein cosmology without the cosmological constant. Because of this, the
primordial nucleosynthesis (Big - Bang nucleosynthesis) result obtained for
standard cosmolog... | [
{
"created": "Tue, 22 Jun 2010 10:22:14 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Dec 2010 12:49:02 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Nov 2011 09:05:28 GMT",
"version": "v3"
}
] | 2011-11-18 | [
[
"Arik",
"M.",
""
],
[
"Susam",
"L. Amon",
""
]
] | Jordan-Brans-Dicke cosmology with a standard kinetic term for the scalar field and no mass term has the same radiation dominated solution as standard Einstein cosmology without the cosmological constant. Because of this, the primordial nucleosynthesis (Big - Bang nucleosynthesis) result obtained for standard cosmology ... |
2011.05941 | Govind Menon | Govind Menon | The Non-Null and Force-Free Electromagnetic Field | I have added some global results in this version | null | 10.1088/1361-6382/abf1c3 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present a covariant formalism that connects solutions to
force-free electrodynamics in the non-null case and foliations of spacetime. In
doing so, we are also able to derive an expression of the general non-null
current density vector. Just as in the null case, solutions in the non-null
case can giv... | [
{
"created": "Wed, 11 Nov 2020 18:00:08 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2020 14:58:09 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Menon",
"Govind",
""
]
] | In this paper, we present a covariant formalism that connects solutions to force-free electrodynamics in the non-null case and foliations of spacetime. In doing so, we are also able to derive an expression of the general non-null current density vector. Just as in the null case, solutions in the non-null case can give ... |
2207.01468 | Daniel Williams | Daniel Williams, John Veitch, Maria Luisa Chiofalo, Patricia Schmidt,
Richard P. Udall, Avi Vajpeji, Charlie Hoy | Asimov: A framework for coordinating parameter estimation workflows | Submitted to Journal of Open Source Software | null | null | null | gr-qc physics.data-an | http://creativecommons.org/licenses/by/4.0/ | Since the first detection in 2015 of gravitational waves from compact binary
coalescence, improvements to the Advanced LIGO and Advanced Virgo detectors
have expanded our view into the universe for these signals. Searches of the of
the latest observing run (O3) have increased the number of detected signals to
90, at ... | [
{
"created": "Mon, 4 Jul 2022 14:59:25 GMT",
"version": "v1"
}
] | 2022-07-05 | [
[
"Williams",
"Daniel",
""
],
[
"Veitch",
"John",
""
],
[
"Chiofalo",
"Maria Luisa",
""
],
[
"Schmidt",
"Patricia",
""
],
[
"Udall",
"Richard P.",
""
],
[
"Vajpeji",
"Avi",
""
],
[
"Hoy",
"Charlie",
""
]
] | Since the first detection in 2015 of gravitational waves from compact binary coalescence, improvements to the Advanced LIGO and Advanced Virgo detectors have expanded our view into the universe for these signals. Searches of the of the latest observing run (O3) have increased the number of detected signals to 90, at a ... |
gr-qc/0610034 | Mark Siewert | Hans-Joerg Fahr and Mark Siewert (Argelander-Institut f. Astronomie,
Abt. Astrophysik) | Does PIONEER measure local spacetime expansion? | LaTeX2e, 12 pages, V2: minor revision in chapter 2 | null | null | null | gr-qc | null | There is a longstanding mystery connected with the radiotracking of distant
interplanetary spaceprobes like ULYSSES, Galileo and especially the two NASA
probes PIONEER 10 and 11. Comparing radiosignals outgoing from the earth to the
probe and ingoing again from the probes do show anomalous frequency shifts
which up t... | [
{
"created": "Mon, 9 Oct 2006 09:30:50 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 2006 10:07:55 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fahr",
"Hans-Joerg",
"",
"Argelander-Institut f. Astronomie,\n Abt. Astrophysik"
],
[
"Siewert",
"Mark",
"",
"Argelander-Institut f. Astronomie,\n Abt. Astrophysik"
]
] | There is a longstanding mystery connected with the radiotracking of distant interplanetary spaceprobes like ULYSSES, Galileo and especially the two NASA probes PIONEER 10 and 11. Comparing radiosignals outgoing from the earth to the probe and ingoing again from the probes do show anomalous frequency shifts which up to ... |
0909.0890 | Ettore Minguzzi | E. Minguzzi | Time functions as utilities | 15 pages, 1 figure. Replaces 0905.0274 "From time to causality" which
is now mostly included in section 4 | Commun.Math.Phys.298:855-868,2010 | 10.1007/s00220-010-1048-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Every time function on spacetime gives a (continuous) total preordering of
the spacetime events which respects the notion of causal precedence. The
problem of the existence of a (semi-)time function on spacetime and the problem
of recovering the causal structure starting from the set of time functions are
studied. It... | [
{
"created": "Fri, 4 Sep 2009 13:35:59 GMT",
"version": "v1"
}
] | 2011-06-23 | [
[
"Minguzzi",
"E.",
""
]
] | Every time function on spacetime gives a (continuous) total preordering of the spacetime events which respects the notion of causal precedence. The problem of the existence of a (semi-)time function on spacetime and the problem of recovering the causal structure starting from the set of time functions are studied. It i... |
gr-qc/0502102 | Emanuel Gallo | Emanuel Gallo, Magdalena Marciano-Melchor, Gilberto Silva-Ortigoza | N-dimensional geometries and Einstein equations from systems of PDE's | null | Int.J.Mod.Phys.16:1725-1734,2007 | 10.1142/S021827180701119X | null | gr-qc | null | The aim of the present work is twofold: first, we show how all the
$n$-dimensional Riemannian and Lorentzian metrics can be constructed from a
certain class of systems of second-order PDE's which are in duality to the
Hamilton-Jacobi equation and second we impose the Einstein equations to these
PDE's.
| [
{
"created": "Thu, 24 Feb 2005 14:40:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gallo",
"Emanuel",
""
],
[
"Marciano-Melchor",
"Magdalena",
""
],
[
"Silva-Ortigoza",
"Gilberto",
""
]
] | The aim of the present work is twofold: first, we show how all the $n$-dimensional Riemannian and Lorentzian metrics can be constructed from a certain class of systems of second-order PDE's which are in duality to the Hamilton-Jacobi equation and second we impose the Einstein equations to these PDE's. |
2303.10767 | Mikel Falxa | M. Falxa, S. Babak, P. T. Baker, B. B\'ecsy, A. Chalumeau, S. Chen, Z.
Chen, N. J. Cornish, L. Guillemot, J. S. Hazboun, C. M. F. Mingarelli, A.
Parthasarathy, A. Petiteau, N. S. Pol, A. Sesana, S. B. Spolaor, S. R.
Taylor, G. Theureau, M. Vallisneri, S. J. Vigeland, C. A. Witt, X. Zhu, J.
Antoniadis, Z. Arzoum... | Searching for continuous Gravitational Waves in the second data release
of the International Pulsar Timing Array | null | null | 10.1093/mnras/stad812 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The International Pulsar Timing Array 2nd data release is the combination of
datasets from worldwide collaborations. In this study, we search for continuous
waves: gravitational wave signals produced by individual supermassive black
hole binaries in the local universe. We consider binaries on circular orbits
and negl... | [
{
"created": "Sun, 19 Mar 2023 20:53:09 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Falxa",
"M.",
""
],
[
"Babak",
"S.",
""
],
[
"Baker",
"P. T.",
""
],
[
"Bécsy",
"B.",
""
],
[
"Chalumeau",
"A.",
""
],
[
"Chen",
"S.",
""
],
[
"Chen",
"Z.",
""
],
[
"Cornish",
"N. J.",
""
... | The International Pulsar Timing Array 2nd data release is the combination of datasets from worldwide collaborations. In this study, we search for continuous waves: gravitational wave signals produced by individual supermassive black hole binaries in the local universe. We consider binaries on circular orbits and neglec... |
2408.02716 | Krishna Pada Das | Krishna Pada Das and Ujjal Debnath | Study of Stable Dark Energy Stars in Ho\v{r}ava-Lifshitz gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the structure and basic physical properties of non-rotating dark
energy stars in Ho$\Check{\text{r}}$ava-Lifshitz (HL) gravity. The interior of
propsed stellar structure is made of isotropic matter obeys extended Chaplygin
gas EoS. The structure equations representing the state of hydrostatic
equilibrium i.e... | [
{
"created": "Mon, 5 Aug 2024 15:23:58 GMT",
"version": "v1"
}
] | 2024-08-07 | [
[
"Das",
"Krishna Pada",
""
],
[
"Debnath",
"Ujjal",
""
]
] | We study the structure and basic physical properties of non-rotating dark energy stars in Ho$\Check{\text{r}}$ava-Lifshitz (HL) gravity. The interior of propsed stellar structure is made of isotropic matter obeys extended Chaplygin gas EoS. The structure equations representing the state of hydrostatic equilibrium i.e.,... |
gr-qc/0212101 | Guihua Tian | Han He, Yongge Ma, and Xuejun Yang | Actions for Vacuum Einstein's Equation with a Killing Symmetry | 8 pages, the difference between the action we proposed and the
symmetry-reduced action is clarified | Int.J.Mod.Phys. D12 (2003) 1961 | 10.1142/S0218271803004274 | null | gr-qc | null | In a space-time $M$ with a Killing vector field $\xi^a$ which is either
everywhere timelike or everywhere spacelike, the collection of all trajectories
of $\xi^a$ gives a 3-dimension space $S$. Besides the symmetry-reduced action
from that of Einstein-Hilbert, an alternative action of the fields on $S$ is
also propos... | [
{
"created": "Wed, 25 Dec 2002 07:59:26 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Apr 2003 14:20:56 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"He",
"Han",
""
],
[
"Ma",
"Yongge",
""
],
[
"Yang",
"Xuejun",
""
]
] | In a space-time $M$ with a Killing vector field $\xi^a$ which is either everywhere timelike or everywhere spacelike, the collection of all trajectories of $\xi^a$ gives a 3-dimension space $S$. Besides the symmetry-reduced action from that of Einstein-Hilbert, an alternative action of the fields on $S$ is also proposed... |
2310.14612 | Hideki Asada | Yuya Nakamura, Hideki Asada | Triangular solution to the planar elliptic three-body problem in the
parametrized post-Newtonian formalism | 5 pages, 2 figures, text improved for clarity, accepted for PRD | Phys. Rev. D 109, 064067 (2024) | 10.1103/PhysRevD.109.064067 | null | gr-qc astro-ph.SR nlin.SI | http://creativecommons.org/licenses/by/4.0/ | A triangular solution [Phys. Rev. D 107, 044005 (2023)] has recently been
found to the planar circular three-body problem in the parametrized
post-Newtonian (PPN) formalism, for which they focus on a class of fully
conservative theories characterized by the Eddington-Robertson parameters
$\beta$ and $\gamma$. The pre... | [
{
"created": "Mon, 23 Oct 2023 06:42:59 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2024 08:20:22 GMT",
"version": "v2"
}
] | 2024-07-03 | [
[
"Nakamura",
"Yuya",
""
],
[
"Asada",
"Hideki",
""
]
] | A triangular solution [Phys. Rev. D 107, 044005 (2023)] has recently been found to the planar circular three-body problem in the parametrized post-Newtonian (PPN) formalism, for which they focus on a class of fully conservative theories characterized by the Eddington-Robertson parameters $\beta$ and $\gamma$. The prese... |
gr-qc/9709065 | Jemal Guven | Jemal Guven and Niall O Murchadha | Necessary Conditions for Apparent Horizons and Singularities in
Spherically Symmetric Initial Data | 15 pages, revtex, to appear in Phys. Rev. D | Phys.Rev. D56 (1997) 7666-7673 | 10.1103/PhysRevD.56.7666 | null | gr-qc | null | We establish necessary conditions for the appearance of both apparent
horizons and singularities in the initial data of spherically symmetric general
relativity when spacetime is foliated extrinsically. When the dominant energy
condition is satisfied these conditions assume a particularly simple form. Let
$\rho_{Max}... | [
{
"created": "Wed, 24 Sep 1997 22:16:14 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Guven",
"Jemal",
""
],
[
"Murchadha",
"Niall O",
""
]
] | We establish necessary conditions for the appearance of both apparent horizons and singularities in the initial data of spherically symmetric general relativity when spacetime is foliated extrinsically. When the dominant energy condition is satisfied these conditions assume a particularly simple form. Let $\rho_{Max}$ ... |
gr-qc/0311026 | Eric Poisson | Eric Poisson | Retarded coordinates based at a world line, and the motion of a small
black hole in an external universe | 20 pages, revtex4, 2 figures | Phys.Rev. D69 (2004) 084007 | 10.1103/PhysRevD.69.084007 | null | gr-qc | null | In the first part of this article I present a system of retarded coordinates
based at an arbitrary world line of an arbitrary curved spacetime. The
retarded-time coordinate labels forward light cones that are centered on the
world line, the radial coordinate is an affine parameter on the null generators
of these ligh... | [
{
"created": "Fri, 7 Nov 2003 14:59:13 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Poisson",
"Eric",
""
]
] | In the first part of this article I present a system of retarded coordinates based at an arbitrary world line of an arbitrary curved spacetime. The retarded-time coordinate labels forward light cones that are centered on the world line, the radial coordinate is an affine parameter on the null generators of these light ... |
1912.05598 | Pablo Bosch | Pablo Bosch, Stephen R. Green, Luis Lehner, Hugo Roussille | Excited hairy black holes: dynamical construction and level transitions | 16 pages, 17 figures | Phys. Rev. D 102, 044014 (2020) | 10.1103/PhysRevD.102.044014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of unstable Reissner-Nordstr\"om anti-de Sitter black
holes under charged scalar field perturbations in spherical symmetry. We
unravel their general behavior and approach to the final equlibrium state. In
the first part of this work, we present a numerical analysis of massive charged
scalar fiel... | [
{
"created": "Wed, 11 Dec 2019 20:12:29 GMT",
"version": "v1"
}
] | 2020-08-12 | [
[
"Bosch",
"Pablo",
""
],
[
"Green",
"Stephen R.",
""
],
[
"Lehner",
"Luis",
""
],
[
"Roussille",
"Hugo",
""
]
] | We study the dynamics of unstable Reissner-Nordstr\"om anti-de Sitter black holes under charged scalar field perturbations in spherical symmetry. We unravel their general behavior and approach to the final equlibrium state. In the first part of this work, we present a numerical analysis of massive charged scalar field ... |
1309.3435 | Ivan Agullo | Ivan Agullo and Jose Navarro-Salas | Conformal anomaly and primordial magnetic fields | 4 pages, no figures. References added, typos corrected | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conformal symmetry of the quantized electromagnetic field breaks down in
curved space-time. We point out that this conformal anomaly is able to generate
a sizable magnetic field during a phase of slow-roll inflation. Such primordial
magnetism is characterized by the expectation value of the squared of the
magneti... | [
{
"created": "Fri, 13 Sep 2013 12:26:55 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Sep 2013 20:22:23 GMT",
"version": "v2"
}
] | 2013-09-24 | [
[
"Agullo",
"Ivan",
""
],
[
"Navarro-Salas",
"Jose",
""
]
] | The conformal symmetry of the quantized electromagnetic field breaks down in curved space-time. We point out that this conformal anomaly is able to generate a sizable magnetic field during a phase of slow-roll inflation. Such primordial magnetism is characterized by the expectation value of the squared of the magnetic ... |
gr-qc/0203004 | Daisuke Ida | Gary W. Gibbons, Daisuke Ida, Tetsuya Shiromizu | Uniqueness and non-uniqueness of static vacuum black holes in higher
dimensions | to appear in Progress of Theoretical Physics Supplement No. 148 | Prog.Theor.Phys.Suppl.148:284-290,2003 | 10.1143/PTPS.148.284 | DAMTP-2002-28, RESCEU-1/02, UTAP-410 | gr-qc hep-th | null | We prove the uniqueness theorem for asymptotically flat static vacuum black
hole solutions in higher dimensional space-times. We also construct infinitely
many non-asymptotically flat regular static black holes on the same spacetime
manifold with the same spherical topology.
| [
{
"created": "Fri, 1 Mar 2002 14:39:11 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Feb 2003 02:21:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gibbons",
"Gary W.",
""
],
[
"Ida",
"Daisuke",
""
],
[
"Shiromizu",
"Tetsuya",
""
]
] | We prove the uniqueness theorem for asymptotically flat static vacuum black hole solutions in higher dimensional space-times. We also construct infinitely many non-asymptotically flat regular static black holes on the same spacetime manifold with the same spherical topology. |
1112.1825 | Daniele Pranzetti | Karim Noui, Alejandro Perez and Daniele Pranzetti | Non-commutative holonomies in 2+1 LQG and Kauffman's brackets | 4 pages; Proceedings of Loops'11, Madrid, to appear in Journal of
Physics: Conference Series (JPCS) | J.Phys.Conf.Ser. 360 (2012) 012040 | 10.1088/1742-6596/360/1/012040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the canonical quantization of 2+1 gravity with {\Lambda} > 0
in the canonical framework of LQG. A natural regularization of the constraints
of 2+1 gravity can be defined in terms of the holonomies of A\pm = A \PM
\surd{\Lambda}e, where the SU(2) connection A and the triad field e are the
conjugated var... | [
{
"created": "Thu, 8 Dec 2011 13:04:21 GMT",
"version": "v1"
}
] | 2012-08-15 | [
[
"Noui",
"Karim",
""
],
[
"Perez",
"Alejandro",
""
],
[
"Pranzetti",
"Daniele",
""
]
] | We investigate the canonical quantization of 2+1 gravity with {\Lambda} > 0 in the canonical framework of LQG. A natural regularization of the constraints of 2+1 gravity can be defined in terms of the holonomies of A\pm = A \PM \surd{\Lambda}e, where the SU(2) connection A and the triad field e are the conjugated varia... |
1602.01221 | Rakesh Kabir | R. Kabir and A. Mukherjee | Oscillatory power spectrum and strongly $k$-dependent $r$ in hybrid
inflation | 11 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1410.0685, arXiv:1412.1814 by other authors | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | For the original hybrid inflation model, we calculate the power spectrum of
curvature perturbations generated during the waterfall, taking into account the
contribution of entropic modes. We study the regime where the potential is very
flat, and in which inflation continues for more than about 60 e-folds. Results
sho... | [
{
"created": "Wed, 3 Feb 2016 08:17:12 GMT",
"version": "v1"
}
] | 2016-02-04 | [
[
"Kabir",
"R.",
""
],
[
"Mukherjee",
"A.",
""
]
] | For the original hybrid inflation model, we calculate the power spectrum of curvature perturbations generated during the waterfall, taking into account the contribution of entropic modes. We study the regime where the potential is very flat, and in which inflation continues for more than about 60 e-folds. Results show ... |
gr-qc/0703138 | James Clark MSci | J. Clark, I.S. Heng, M. Pitkin, G. Woan | An Evidence Based Search Method For Gravitational Waves From Neutron
Star Ring-downs | 14 pages, 12 figures | Phys.Rev.D76:043003,2007 | 10.1103/PhysRevD.76.043003 | null | gr-qc | null | The excitation of quadrupolar quasi-normal modes in a neutron star leads to
the emission of a short, distinctive, burst of gravitational radiation in the
form of a decaying sinusoid or `ring-down'. We present a Bayesian analysis
method which incorporates relevant prior information about the source and known
instrumen... | [
{
"created": "Wed, 28 Mar 2007 16:21:00 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Mar 2007 15:02:07 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Jun 2007 13:50:19 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Clark",
"J.",
""
],
[
"Heng",
"I. S.",
""
],
[
"Pitkin",
"M.",
""
],
[
"Woan",
"G.",
""
]
] | The excitation of quadrupolar quasi-normal modes in a neutron star leads to the emission of a short, distinctive, burst of gravitational radiation in the form of a decaying sinusoid or `ring-down'. We present a Bayesian analysis method which incorporates relevant prior information about the source and known instrumenta... |
gr-qc/0105102 | Fatimah Shojai | Fatimah Shojai and Ali Shojai | Pure Quantum Solutions of Bohmian Quantum Gravity | 10 pages, LaTeX | JHEP 0105:037,2001 | 10.1088/1126-6708/2001/05/037 | null | gr-qc | null | In this paper we have investigated the pure quantum solutions of Bohmian
quantum gravity. By pure quantum solution we mean a solution in which the
quantum potential cannot be ignored with respect to the classical potential,
especially in Bohmian quantum gravity we are interested in the case where these
two potentials... | [
{
"created": "Mon, 28 May 2001 05:06:58 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Shojai",
"Fatimah",
""
],
[
"Shojai",
"Ali",
""
]
] | In this paper we have investigated the pure quantum solutions of Bohmian quantum gravity. By pure quantum solution we mean a solution in which the quantum potential cannot be ignored with respect to the classical potential, especially in Bohmian quantum gravity we are interested in the case where these two potentials a... |
0806.3397 | Christian Corda | Christian Corda | A solution of linearized Einstein field equations in vacuum used for the
detection of the stochastic background of gravitational waves | Definitive version published in Astroparticle Physics | Astropart.Phys.27:539-549,2007 | 10.1016/j.astropartphys.2007.04.001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A solution of linearized Einstein field equations in vacuum is given and
discussed. First it is shown that, computing from our particular metric the
linearized connections, the linearized Riemann tensor and the linearized Ricci
tensor, the linearized Ricci tensor results equal to zero. Then the effect on
test masses ... | [
{
"created": "Fri, 20 Jun 2008 14:12:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Corda",
"Christian",
""
]
] | A solution of linearized Einstein field equations in vacuum is given and discussed. First it is shown that, computing from our particular metric the linearized connections, the linearized Riemann tensor and the linearized Ricci tensor, the linearized Ricci tensor results equal to zero. Then the effect on test masses of... |
2408.02077 | Aritra Ghosh | Bijan Bagchi, Aritra Ghosh, Sauvik Sen | Landauer's principle and black hole area quantization | Preliminary version, comments are welcome | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article assesses Landauer's principle from information theory in the
context of area quantization of the Schwarzschild black hole. Within a
quantum-mechanical perspective where Hawking evaporation can be interpreted in
terms of transitions between the discrete states of the area (or mass)
spectrum, we justify th... | [
{
"created": "Sun, 4 Aug 2024 16:07:40 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Bagchi",
"Bijan",
""
],
[
"Ghosh",
"Aritra",
""
],
[
"Sen",
"Sauvik",
""
]
] | This article assesses Landauer's principle from information theory in the context of area quantization of the Schwarzschild black hole. Within a quantum-mechanical perspective where Hawking evaporation can be interpreted in terms of transitions between the discrete states of the area (or mass) spectrum, we justify that... |
2011.10858 | Askar Ali | Askar Ali | Magnetized hairy black holes of dimensionally continued gravity coupled
to double-logarithmic electrodynamics | null | Eur. Phys. J. Plus 137, 108 (2022) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recently proposed model for nonlinear electrodynamics has been minimally
coupled to dimensionally continued gravity and the topological black holes in
the presence of conformal scalar field were studied. In this setup, the new
magnetized hairy black hole solution has been found and its thermodynamic
properties have... | [
{
"created": "Sat, 21 Nov 2020 20:17:11 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2022 10:29:29 GMT",
"version": "v2"
}
] | 2022-02-16 | [
[
"Ali",
"Askar",
""
]
] | A recently proposed model for nonlinear electrodynamics has been minimally coupled to dimensionally continued gravity and the topological black holes in the presence of conformal scalar field were studied. In this setup, the new magnetized hairy black hole solution has been found and its thermodynamic properties have a... |
2406.04605 | Shreya Banerjee | Shreya Banerjee and Aritrya Paul | Effect of Accretion on the evolution of Primordial Black Holes in the
context of Modified Gravity Theories | 15 pages, 14 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/publicdomain/zero/1.0/ | We investigates the effect of accretion of cosmic fluid on the evolution of
Primordial Black Holes (PBHs) within the framework of Modified gravity
theories. We consider a general form of the Hubble parameter, reflecting a
general class of modified gravity theories and bouncing models. We then study
the effect of such... | [
{
"created": "Fri, 7 Jun 2024 03:28:10 GMT",
"version": "v1"
}
] | 2024-06-10 | [
[
"Banerjee",
"Shreya",
""
],
[
"Paul",
"Aritrya",
""
]
] | We investigates the effect of accretion of cosmic fluid on the evolution of Primordial Black Holes (PBHs) within the framework of Modified gravity theories. We consider a general form of the Hubble parameter, reflecting a general class of modified gravity theories and bouncing models. We then study the effect of such m... |
gr-qc/0408085 | Jose Natario | Jose Natario | Newtonian limits of warp drive spacetimes | 9 pages; v2: major changes; v3: misprints corrected | Gen.Rel.Grav. 38 (2006) 475-484 | 10.1007/s10714-006-0234-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find a class of warp drive spacetimes possessing Newtonian limits, which
we then determine. The same method is used to compute Newtonian limits of the
Schwarzschild solution and spatially flat Friedmann-Robertson-Walker
cosmological models.
| [
{
"created": "Wed, 25 Aug 2004 15:17:56 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2005 17:19:20 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Oct 2009 09:48:30 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Natario",
"Jose",
""
]
] | We find a class of warp drive spacetimes possessing Newtonian limits, which we then determine. The same method is used to compute Newtonian limits of the Schwarzschild solution and spatially flat Friedmann-Robertson-Walker cosmological models. |
gr-qc/0505099 | Franklin Felber | F. S. Felber | Exact Relativistic 'Antigravity' Propulsion | 4 pages, 3 figures, changed format only, attached 5 AVI files
(animated exact solutions of black holes incident on initially stationary
payloads) | AIP Conf.Proc.813:1374-1381,2006 | 10.1063/1.2169322 | SR05-06 | gr-qc | null | The Schwarzschild solution is used to find the exact relativistic motion of a
payload in the gravitational field of a mass moving with constant velocity. At
radial approach or recession speeds faster than 3^-1/2 times the speed of
light, even a small mass gravitationally repels a payload. At relativistic
speeds, a su... | [
{
"created": "Thu, 19 May 2005 18:57:52 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2005 12:40:05 GMT",
"version": "v2"
}
] | 2010-12-13 | [
[
"Felber",
"F. S.",
""
]
] | The Schwarzschild solution is used to find the exact relativistic motion of a payload in the gravitational field of a mass moving with constant velocity. At radial approach or recession speeds faster than 3^-1/2 times the speed of light, even a small mass gravitationally repels a payload. At relativistic speeds, a suit... |
2204.09943 | Hirotada Okawa | Hirotada Okawa, Kotaro Fujisawa, Nobutoshi Yasutake, Misa Ogata, Yu
Yamamoto, Shoichi Yamada | A novel formulation for the evolution of relativistic rotating stars | 19 pages, 13 figures | null | null | null | gr-qc astro-ph.HE cs.NA math.NA | http://creativecommons.org/licenses/by/4.0/ | We present a new formulation to construct numerically equilibrium
configurations of rotating stars in general relativity. Having in mind the
application to their quasi static evolutions, we adopt a Lagrangian formulation
of our own devising, in which we solve force balance equations to seek for the
positions of fluid... | [
{
"created": "Thu, 21 Apr 2022 08:04:34 GMT",
"version": "v1"
}
] | 2022-04-22 | [
[
"Okawa",
"Hirotada",
""
],
[
"Fujisawa",
"Kotaro",
""
],
[
"Yasutake",
"Nobutoshi",
""
],
[
"Ogata",
"Misa",
""
],
[
"Yamamoto",
"Yu",
""
],
[
"Yamada",
"Shoichi",
""
]
] | We present a new formulation to construct numerically equilibrium configurations of rotating stars in general relativity. Having in mind the application to their quasi static evolutions, we adopt a Lagrangian formulation of our own devising, in which we solve force balance equations to seek for the positions of fluid e... |
2112.04170 | Mingzhi Wang | Mingzhi Wang, Guanghai Guo, Songbai Chen, Jiliang Jing | The surface geometry and shadow of a Schwarzschild black hole with halo | 20 pages,12 figures | Chin. Phys. C 47, no.1,015102 (2023) | 10.1088/1674-1137/ac94bc | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the surface geometry and shadows of Schwarzschild black hole
with a halo containing the quadrupolar and octopolar terms. We found the
quadrupole term makes the Schwarzschild black hole prolate for the quadrupole
strength $\mathcal{Q}<0$ and oblate for $\mathcal{Q}>0$, and the octopole term
makes shado... | [
{
"created": "Wed, 8 Dec 2021 08:34:26 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jan 2022 10:25:29 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Apr 2022 02:49:31 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Sep 2022 14:13:56 GMT",
"version": "v4"
}
] | 2022-12-09 | [
[
"Wang",
"Mingzhi",
""
],
[
"Guo",
"Guanghai",
""
],
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have studied the surface geometry and shadows of Schwarzschild black hole with a halo containing the quadrupolar and octopolar terms. We found the quadrupole term makes the Schwarzschild black hole prolate for the quadrupole strength $\mathcal{Q}<0$ and oblate for $\mathcal{Q}>0$, and the octopole term makes shadow ... |
2403.16562 | Jos\'e Antonio N\'ajera | Jos\'e Antonio N\'ajera and Celia Escamilla-Rivera | Phantom scalar field cosmologies constrained by early cosmic
measurements | 10 pages, 3 figures | Universe 2024, 10(6), 232 | 10.3390/universe10060232 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we explore new constraints on phantom scalar field cosmologies
with a scalar field employing early times catalogues related to CMB
measurements, along with the local standard observables, like Supernovae Type
Ia (SNIa), $H(z)$ measurements (Cosmic Clocks), and Baryon Acoustic
Oscillations (BAO) baseline... | [
{
"created": "Mon, 25 Mar 2024 09:24:34 GMT",
"version": "v1"
}
] | 2024-05-27 | [
[
"Nájera",
"José Antonio",
""
],
[
"Escamilla-Rivera",
"Celia",
""
]
] | In this work, we explore new constraints on phantom scalar field cosmologies with a scalar field employing early times catalogues related to CMB measurements, along with the local standard observables, like Supernovae Type Ia (SNIa), $H(z)$ measurements (Cosmic Clocks), and Baryon Acoustic Oscillations (BAO) baselines.... |
1108.1507 | Michele Arzano | Emanuele Alesci and Michele Arzano | Anomalous dimension in semiclassical gravity | RevTeX, 9 pages, 1 figure; v2: typos corrected and reference added | null | 10.1016/j.physletb.2011.12.026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The description of the phase space of relativistic particles coupled to
three-dimensional Einstein gravity requires momenta which are coordinates on a
group manifold rather than on ordinary Minkowski space. The corresponding field
theory turns out to be a non-commutative field theory on configuration space
and a grou... | [
{
"created": "Sat, 6 Aug 2011 19:51:37 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2011 17:09:17 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Alesci",
"Emanuele",
""
],
[
"Arzano",
"Michele",
""
]
] | The description of the phase space of relativistic particles coupled to three-dimensional Einstein gravity requires momenta which are coordinates on a group manifold rather than on ordinary Minkowski space. The corresponding field theory turns out to be a non-commutative field theory on configuration space and a group ... |
2211.01272 | Ignacio Maga\~na Hernandez | Ignacio Maga\~na Hernandez | Measuring the polarization content of gravitational waves with strongly
lensed binary black hole mergers | 8 pages, 6 figures | null | null | LIGO-P2200329 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Alternative theories of gravity predict up to six distinct polarization modes
for gravitational waves. Strong gravitational lensing of gravitational waves
allows us to probe the polarization content of these signals by effectively
increasing the number of observations from the same astrophysical source. The
lensing t... | [
{
"created": "Wed, 2 Nov 2022 16:56:33 GMT",
"version": "v1"
}
] | 2022-11-03 | [
[
"Hernandez",
"Ignacio Magaña",
""
]
] | Alternative theories of gravity predict up to six distinct polarization modes for gravitational waves. Strong gravitational lensing of gravitational waves allows us to probe the polarization content of these signals by effectively increasing the number of observations from the same astrophysical source. The lensing tim... |
2308.08738 | I. V. Kanatchikov | I.V. Kanatchikov | The Quantum Waves of Minkowski Spacetime And The Minimal Acceleration
From Precanonical Quantum Gravity | 10 pp. Appeared as doi:10.1088/1742-6596/2533/1/012037 in DICE2022
Proceedings | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the simplest solutions of the previously obtained precanonical
Schr\"odinger equation for quantum gravity, which correspond to the plane waves
on the spin connection bundle and reproduce the Minkowski spacetime on average.
Quantum fluctuations lead to the emergence of the minimal acceleration $a_0$
relat... | [
{
"created": "Thu, 17 Aug 2023 02:24:28 GMT",
"version": "v1"
}
] | 2023-08-21 | [
[
"Kanatchikov",
"I. V.",
""
]
] | We construct the simplest solutions of the previously obtained precanonical Schr\"odinger equation for quantum gravity, which correspond to the plane waves on the spin connection bundle and reproduce the Minkowski spacetime on average. Quantum fluctuations lead to the emergence of the minimal acceleration $a_0$ related... |
1806.00568 | Hajime Sotani | Hajime Sotani and Kostas D. Kokkotas | Compactness of neutron stars and Tolman VII solutions in scalar-tensor
gravity | accepted for publication in PRD | Phys. Rev. D 97, 124034 (2018) | 10.1103/PhysRevD.97.124034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We systematically examine the compactness of neutron stars as Tolman VII
solutions in scalar-tensor theory of gravity. As a result, when the coupling
constant is confined to values provided by astronomical observations we show
that the maximum compactness of neutron stars in general relativity is higher
than that in ... | [
{
"created": "Sat, 2 Jun 2018 01:55:28 GMT",
"version": "v1"
}
] | 2018-06-20 | [
[
"Sotani",
"Hajime",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | We systematically examine the compactness of neutron stars as Tolman VII solutions in scalar-tensor theory of gravity. As a result, when the coupling constant is confined to values provided by astronomical observations we show that the maximum compactness of neutron stars in general relativity is higher than that in sc... |
0704.0849 | Dr. Anirudh Pradhan | Anirudh Pradhan, J. P. Shahi and C. V. Singh | LRS Bianchi Type-V Viscous Fluid Universe With a Time Dependent
Cosmological Term $\Lambda$ | 13 pages, no figure | null | null | null | gr-qc | null | An LRS Bianchi type-V cosmological models representing a viscous fluid
distribution with a time dependent cosmological term $\Lambda$ is investigated.
To get a determinate solution, the viscosity coefficient of bulk viscous fluid
is assumed to be a power function of mass density. It turns out that the
cosmological te... | [
{
"created": "Fri, 6 Apr 2007 07:08:10 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Aug 2007 05:58:45 GMT",
"version": "v2"
}
] | 2007-08-06 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Shahi",
"J. P.",
""
],
[
"Singh",
"C. V.",
""
]
] | An LRS Bianchi type-V cosmological models representing a viscous fluid distribution with a time dependent cosmological term $\Lambda$ is investigated. To get a determinate solution, the viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density. It turns out that the cosmological term... |
gr-qc/9507018 | null | Alexander Vilenkin | Predictions from Quantum Cosmology | final version of Erice lectures; some corrections regarding
predictions for the origin of density fluctuations and for the cosmological
constant; 23 pages; 3 figures can be faxed on request | null | null | null | gr-qc astro-ph hep-th | null | After reviewing the general ideas of quantum cosmology (Wheeler-DeWitt
equation, boundary conditions, interpretation of $\psi$), I discuss how these
ideas can be tested observationally. Observational predictions differ for
different choices of boundary conditions. With tunneling boundary conditions,
$\psi$ favors ini... | [
{
"created": "Fri, 7 Jul 1995 15:23:00 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 1995 15:10:00 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Nov 1995 20:57:00 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Vilenkin",
"Alexander",
""
]
] | After reviewing the general ideas of quantum cosmology (Wheeler-DeWitt equation, boundary conditions, interpretation of $\psi$), I discuss how these ideas can be tested observationally. Observational predictions differ for different choices of boundary conditions. With tunneling boundary conditions, $\psi$ favors initi... |
gr-qc/9907042 | Charles Hellaby | Charles Hellaby, Ariel Sumeruk and G.F.R. Ellis (University of Cape
Town) | Classical Signature Change in the Black Hole Topology | LaTeX, 19 pages, 11 Figures. Replacement - only change is following
comment: For a pdf version with the figures embedded, see
http://www.mth.uct.ac.za/~cwh/mypub.html | Int.J.Mod.Phys.D6:211-238,1997 | 10.1142/S0218271897000133 | null | gr-qc | null | Investigations of classical signature change have generally envisaged
applications to cosmological models, usually a
Friedmann-Lemaitre-Robertson-Walker model. The purpose has been to avoid the
inevitable singularity of models with purely Lorentzian signature, replacing
the neighbourhood of the big bang with an initi... | [
{
"created": "Fri, 9 Jul 1999 14:54:23 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2004 13:22:35 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Hellaby",
"Charles",
"",
"University of Cape\n Town"
],
[
"Sumeruk",
"Ariel",
"",
"University of Cape\n Town"
],
[
"Ellis",
"G. F. R.",
"",
"University of Cape\n Town"
]
] | Investigations of classical signature change have generally envisaged applications to cosmological models, usually a Friedmann-Lemaitre-Robertson-Walker model. The purpose has been to avoid the inevitable singularity of models with purely Lorentzian signature, replacing the neighbourhood of the big bang with an initial... |
1910.13811 | Faizuddin Ahmed | Faizuddin Ahmed | Reply to "Comment on Comment on Linear confinement of a scalar particle
in a G\"{o}del-type space-time" | 1 page, Reply to comment arXiv:1910.11701 [gr-qc] | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A hypothetical energy quantization condition is imposed in [1] (Francisco A.
Cruz Neto {\it et al.}, arXiv : 1910.11701 [gr-qc]) in order to show consistent
of the result with those in [2] but fail or unable to show consistency with
those in [3].
| [
{
"created": "Tue, 29 Oct 2019 04:22:06 GMT",
"version": "v1"
}
] | 2019-10-31 | [
[
"Ahmed",
"Faizuddin",
""
]
] | A hypothetical energy quantization condition is imposed in [1] (Francisco A. Cruz Neto {\it et al.}, arXiv : 1910.11701 [gr-qc]) in order to show consistent of the result with those in [2] but fail or unable to show consistency with those in [3]. |
1701.08873 | Ronaldo S. S. Vieira | Ronaldo S. S. Vieira, W{\l}odek Klu\'zniak, Marek Abramowicz | Curvature dependence of relativistic epicyclic frequencies in static,
axially symmetric spacetimes | 6 pages, 2 figures. Accepted for publication in Physical Review D | Phys. Rev. D 95, 044008 (2017) | 10.1103/PhysRevD.95.044008 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sum of squared epicyclic frequencies of nearly circular motion
($\omega_r^2+\omega_\theta^2$) in axially symmetric configurations of Newtonian
gravity is known to depend both on the matter density and on the angular
velocity profile of circular orbits. It was recently found that this sum goes
to zero at the photo... | [
{
"created": "Mon, 30 Jan 2017 23:25:15 GMT",
"version": "v1"
}
] | 2017-02-13 | [
[
"Vieira",
"Ronaldo S. S.",
""
],
[
"Kluźniak",
"Włodek",
""
],
[
"Abramowicz",
"Marek",
""
]
] | The sum of squared epicyclic frequencies of nearly circular motion ($\omega_r^2+\omega_\theta^2$) in axially symmetric configurations of Newtonian gravity is known to depend both on the matter density and on the angular velocity profile of circular orbits. It was recently found that this sum goes to zero at the photon ... |
2311.05960 | Adam Zenon Kaczmarek | Adam Z. Kaczmarek and Dominik Szcz\k{e}\'sniak | Cosmological aspects of the unimodular-mimetic $f(\mathcal{G})$ gravity | 16 pages, 2 figures, appendix | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work we introduce and study the unimodular-mimetic $f(\mathcal{G})$
gravity, where unimodular and mimetic constraints are incorporated through
corresponding Lagrange multipliers. We present field equations governing this
theory and discuss their main properties. By using the reconstruction scheme,
we obtain q... | [
{
"created": "Fri, 10 Nov 2023 09:47:52 GMT",
"version": "v1"
}
] | 2023-11-13 | [
[
"Kaczmarek",
"Adam Z.",
""
],
[
"Szczęśniak",
"Dominik",
""
]
] | In this work we introduce and study the unimodular-mimetic $f(\mathcal{G})$ gravity, where unimodular and mimetic constraints are incorporated through corresponding Lagrange multipliers. We present field equations governing this theory and discuss their main properties. By using the reconstruction scheme, we obtain qua... |
0909.0514 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | Clifton's spherical solution in f(R) vacuo harbours a naked singularity | 7 pages, 1 figure, latex. To appear in Class. Quantum Grav. List of
references updated | Class.Quant.Grav.26:195013,2009 | 10.1088/0264-9381/26/19/195013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Clifton's exact solution of f(R)=R^(1+\delta) gravity describing a dynamical
spherical metric which is asymptotically Friedmann-Lemaitre-Robertson-Walker is
studied. It is shown that it harbours a strong spacetime singularity and that
this singularity is naked at late times.
| [
{
"created": "Wed, 2 Sep 2009 20:07:20 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2009 22:31:22 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | Clifton's exact solution of f(R)=R^(1+\delta) gravity describing a dynamical spherical metric which is asymptotically Friedmann-Lemaitre-Robertson-Walker is studied. It is shown that it harbours a strong spacetime singularity and that this singularity is naked at late times. |
gr-qc/0701113 | Vladimir S. Manko | F.J. Ernst, V.S. Manko, E. Ruiz | Equatorial symmetry/antisymmetry of stationary axisymmetric electrovac
spacetimes. II | 11 pages, minor changes to match the published version | Class.Quant.Grav.24:2193-2205,2007 | 10.1088/0264-9381/24/9/003 | null | gr-qc | null | In this second paper devoted to the equatorial symmetry/antisymmetry of
stationary axisymmetric electrovac spacetimes we show how two theorems proved
in our previous paper (Ernst, Manko and Ruiz 2006 Class. Quantum Grav. 23,
4945) can be utilized to construct exact solutions that are equatorially
symmetric or antisym... | [
{
"created": "Sat, 20 Jan 2007 18:48:12 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Apr 2007 01:01:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ernst",
"F. J.",
""
],
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | In this second paper devoted to the equatorial symmetry/antisymmetry of stationary axisymmetric electrovac spacetimes we show how two theorems proved in our previous paper (Ernst, Manko and Ruiz 2006 Class. Quantum Grav. 23, 4945) can be utilized to construct exact solutions that are equatorially symmetric or antisymme... |
gr-qc/9803032 | Christos Tsagas | Christos G. Tsagas and John D. Barrow (University of Sussex) | Gauge-invariant magnetic perturbations in perfect-fluid cosmologies | Revised version (some minor changes - few equations added). 26 pages.
No figures. To appear in Classical and Quantum Gravity | Class.Quant.Grav. 15 (1998) 3523-3544 | 10.1088/0264-9381/15/11/016 | null | gr-qc astro-ph | null | We develop further our extension of the Ellis-Bruni covariant and
gauge-invariant formalism to the general relativistic treatment of density
perturbations in the presence of cosmological magnetic fields. We present
detailed analysis of the kinematical and dynamical behaviour of perturbed
magnetized FRW cosmologies co... | [
{
"created": "Mon, 9 Mar 1998 18:16:42 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Oct 1998 18:48:25 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Tsagas",
"Christos G.",
"",
"University of Sussex"
],
[
"Barrow",
"John D.",
"",
"University of Sussex"
]
] | We develop further our extension of the Ellis-Bruni covariant and gauge-invariant formalism to the general relativistic treatment of density perturbations in the presence of cosmological magnetic fields. We present detailed analysis of the kinematical and dynamical behaviour of perturbed magnetized FRW cosmologies cont... |
gr-qc/9606043 | Steve Carlip | Steven Carlip | The Statistical Mechanics of the Three-Dimensional Euclidean Black Hole | 9 pages, LaTeX. Significant sign error corrected, continuation to
Lorentzian signature clarified, several other clarifications (although
conclusion is unaffected). To appear in Phys. Rev. D | Phys.Rev.D55:878-882,1997 | 10.1103/PhysRevD.55.878 | UCD-96-13 | gr-qc hep-th | null | In its formulation as a Chern-Simons theory, three-dimensional general
relativity induces a Wess-Zumino-Witten action on spatial boundaries. Treating
the horizon of the three-dimensional Euclidean black hole as a boundary, I
count the states of the resulting WZW model, and show that when analytically
continued back t... | [
{
"created": "Mon, 17 Jun 1996 00:28:59 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 1996 17:50:01 GMT",
"version": "v2"
}
] | 2010-04-28 | [
[
"Carlip",
"Steven",
""
]
] | In its formulation as a Chern-Simons theory, three-dimensional general relativity induces a Wess-Zumino-Witten action on spatial boundaries. Treating the horizon of the three-dimensional Euclidean black hole as a boundary, I count the states of the resulting WZW model, and show that when analytically continued back to ... |
2008.06774 | Cole Kelson-Packer | Cole Kelson-Packer, John Belz | Investigation into Length Scale Dominance in Critical Black Hole
Formation | 8 pages, 10 figures | Phys. Rev. D 102, 084050 (2020) | 10.1103/PhysRevD.102.084050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The critical formation of low-mass black holes is a historical cornerstone of
numerical General Relativity, with important implications in cosmology for
censorship conjectures and the production of primordial black holes (PBHs).
Concurrent with the surge in black hole observational physics in recent years
has been an... | [
{
"created": "Sat, 15 Aug 2020 19:58:09 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2020 17:26:03 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Kelson-Packer",
"Cole",
""
],
[
"Belz",
"John",
""
]
] | The critical formation of low-mass black holes is a historical cornerstone of numerical General Relativity, with important implications in cosmology for censorship conjectures and the production of primordial black holes (PBHs). Concurrent with the surge in black hole observational physics in recent years has been an i... |
2112.15173 | Manuel Hohmann | Manuel Hohmann | A geometric view on local Lorentz transformations in teleparallel
gravity | 19 pages, no figures; contribution to the Special Issue of the
International Journal of Geometric Methods in Modern Physics dedicated to the
conference Geometric Foundations of Gravity in Tartu 2021 | null | 10.1142/S0219887822400011 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Local Lorentz transformations play an important role in teleparallel gravity
theories, in which a tetrad is conventionally employed as a fundamental field
variable describing the gravitational field. It is commonly understood that
modifications of general relativity in the teleparallel framework break a
certain notio... | [
{
"created": "Thu, 30 Dec 2021 18:55:28 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Hohmann",
"Manuel",
""
]
] | Local Lorentz transformations play an important role in teleparallel gravity theories, in which a tetrad is conventionally employed as a fundamental field variable describing the gravitational field. It is commonly understood that modifications of general relativity in the teleparallel framework break a certain notion ... |
gr-qc/0612156 | Pierre Martinetti | Pierre Martinetti | Is life a thermal horizon ? | Proceedings of the conference DICE 2006, Piombino september 2006 | J.Phys.Conf.Ser.67:012034,2007 | 10.1088/1742-6596/67/1/012034 | null | gr-qc hep-th | null | This talk aims at questioning the vanishing of Unruh temperature for an
inertial observer in Minkovski spacetime with finite lifetime, arguing that in
the non eternal case the existence of a causal horizon is not linked to the
non-vanishing of the acceleration. This is illustrated by a previous result,
the diamonds t... | [
{
"created": "Sun, 24 Dec 2006 15:35:34 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2007 15:19:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Martinetti",
"Pierre",
""
]
] | This talk aims at questioning the vanishing of Unruh temperature for an inertial observer in Minkovski spacetime with finite lifetime, arguing that in the non eternal case the existence of a causal horizon is not linked to the non-vanishing of the acceleration. This is illustrated by a previous result, the diamonds tem... |
gr-qc/0203006 | Xavier Siemens | Xavier Siemens, Ken D. Olum and Alexander Vilenkin | On the size of the smallest scales in cosmic string networks | 4 pages, revtex | Phys.Rev. D66 (2002) 043501 | 10.1103/PhysRevD.66.043501 | null | gr-qc astro-ph hep-ph | null | We present a method for the calculation of the gravitational back reaction
cutoff on the smallest scales of cosmic string networks taking into account
that not all modes on strings interact with all other modes. This results in a
small scale structure cutoff that is sensitive to the initial spectrum of
perturbations ... | [
{
"created": "Sat, 2 Mar 2002 19:31:43 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Siemens",
"Xavier",
""
],
[
"Olum",
"Ken D.",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | We present a method for the calculation of the gravitational back reaction cutoff on the smallest scales of cosmic string networks taking into account that not all modes on strings interact with all other modes. This results in a small scale structure cutoff that is sensitive to the initial spectrum of perturbations pr... |
gr-qc/9609071 | Carlos Kozameh | Alfredo E. Dominguez, Carlos N. Kozameh, Malcolm Ludvigsen | Superselection Sectors in Asymptotic Quantization of Gravity | 22 pages, revtex file | null | null | null | gr-qc | null | Using the continuity of the scalar $\Psi_2$ (the mass aspect) at null
infinity through $i_o$ we show that the space of radiative solutions of general
relativity can be thought of a fibered space where the value of $\Psi_2$ at
$i_o$ plays the role of the base space. We also show that the restriction of
the available s... | [
{
"created": "Mon, 30 Sep 1996 13:43:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dominguez",
"Alfredo E.",
""
],
[
"Kozameh",
"Carlos N.",
""
],
[
"Ludvigsen",
"Malcolm",
""
]
] | Using the continuity of the scalar $\Psi_2$ (the mass aspect) at null infinity through $i_o$ we show that the space of radiative solutions of general relativity can be thought of a fibered space where the value of $\Psi_2$ at $i_o$ plays the role of the base space. We also show that the restriction of the available sym... |
1806.09984 | Yotam Sherf | Yotam Sherf | Hyperbolicity Constraints in Extended Gravity Theories | 15 pages, 1 figure | null | 10.1088/1402-4896/ab1352 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the characteristic structure of the Einstein-Hilbert (EH) action
when modifications of the form of $R^2,~ R_{\mu\nu}^2$,
$R_{\mu\nu\rho\sigma}^2$ and $C_{\mu\nu\rho\sigma}^2$ are included. We show
that when these quadratic terms are significant, the initial value problem is
generically ill-posed. We do so by... | [
{
"created": "Sat, 23 Jun 2018 22:08:02 GMT",
"version": "v1"
}
] | 2019-06-07 | [
[
"Sherf",
"Yotam",
""
]
] | We study the characteristic structure of the Einstein-Hilbert (EH) action when modifications of the form of $R^2,~ R_{\mu\nu}^2$, $R_{\mu\nu\rho\sigma}^2$ and $C_{\mu\nu\rho\sigma}^2$ are included. We show that when these quadratic terms are significant, the initial value problem is generically ill-posed. We do so by d... |
1609.09349 | Katherine Jones-Smith | Harsh Mathur, Katherine Jones-Smith, Ashton Lowenstein | An analysis of the LIGO discovery based on Introductory Physics | Updated version matches journal version. Similar to analysis in
1608.01940 | American Journal of Physics 85.9 (2017): 676-682 | 10.1119/1.4985727 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary black hole mergers are analyzed using concepts from introductory
physics. Drawing upon Newtonian mechanics, dimensional considerations, and
analogies between gravitational and electromagnetic waves, we are able to
explain the principal features of LIGO's data and make order of magnitude
estimates of key parame... | [
{
"created": "Tue, 27 Sep 2016 01:09:25 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Oct 2016 21:13:00 GMT",
"version": "v2"
},
{
"created": "Sun, 31 Dec 2017 23:10:28 GMT",
"version": "v3"
}
] | 2018-01-03 | [
[
"Mathur",
"Harsh",
""
],
[
"Jones-Smith",
"Katherine",
""
],
[
"Lowenstein",
"Ashton",
""
]
] | Binary black hole mergers are analyzed using concepts from introductory physics. Drawing upon Newtonian mechanics, dimensional considerations, and analogies between gravitational and electromagnetic waves, we are able to explain the principal features of LIGO's data and make order of magnitude estimates of key paramete... |
1012.4244 | Sanjit Das | Sanjit Das and Sayan Kar | Bach flows of product manifolds | to appear in IJGMMP (2012) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate various aspects of a geometric flow defined using the Bach
tensor. Firstly, using a well-known split of the Bach tensor components for
$(2,2)$ unwarped product manifolds, we solve the Bach flow equations for
typical examples of product manifolds like $S^2\times S^2$, $R^2\times S^2$. In
addition, we ob... | [
{
"created": "Mon, 20 Dec 2010 06:23:25 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jun 2012 11:36:01 GMT",
"version": "v2"
}
] | 2012-06-20 | [
[
"Das",
"Sanjit",
""
],
[
"Kar",
"Sayan",
""
]
] | We investigate various aspects of a geometric flow defined using the Bach tensor. Firstly, using a well-known split of the Bach tensor components for $(2,2)$ unwarped product manifolds, we solve the Bach flow equations for typical examples of product manifolds like $S^2\times S^2$, $R^2\times S^2$. In addition, we obta... |
2406.02261 | Jobin Thomas Valliyakalayil Mr | Jobin Thomas Valliyakalayil, Andrew Wade, David Rabeling, Jue Zhang,
Daniel Shaddock and Kirk McKenzie | Experimental demonstration of the combined arm- and cavity-locking
system for LISA | 11 pages, 13 figures | null | null | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Laser frequency noise suppression is a critical requirement for the Laser
Interferometer Space Antenna (LISA) mission to detect gravitational waves. The
baseline laser stabilization is achieved using cavity pre-stabilization and a
post-processing technique called Time-Delay-Interferometry (TDI). To enhance
the margin... | [
{
"created": "Tue, 4 Jun 2024 12:32:48 GMT",
"version": "v1"
}
] | 2024-06-05 | [
[
"Valliyakalayil",
"Jobin Thomas",
""
],
[
"Wade",
"Andrew",
""
],
[
"Rabeling",
"David",
""
],
[
"Zhang",
"Jue",
""
],
[
"Shaddock",
"Daniel",
""
],
[
"McKenzie",
"Kirk",
""
]
] | Laser frequency noise suppression is a critical requirement for the Laser Interferometer Space Antenna (LISA) mission to detect gravitational waves. The baseline laser stabilization is achieved using cavity pre-stabilization and a post-processing technique called Time-Delay-Interferometry (TDI). To enhance the margins ... |
gr-qc/0209008 | Jorge Pullin | Jorge Pullin | Canonical quantization of general relativity: the last 18 years in a
nutshell | 13 pages, RevTeX, one figures, to appear in Proceedings of the Xth
Brazilian School on Cosmology and Gravitation, Mario Novello, editor | AIP Conf.Proc.668:141-153,2003 | 10.1063/1.1587095 | ESI-1198 | gr-qc | null | This is a summary of the lectures presented at the Xth Brazilian school on
cosmology and gravitation. The style of the text is that of a lightly written
descriptive summary of ideas with almost no formulas, with pointers to the
literature. We hope this style can encourage new people to take a look into
these results.... | [
{
"created": "Tue, 3 Sep 2002 16:15:39 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Pullin",
"Jorge",
""
]
] | This is a summary of the lectures presented at the Xth Brazilian school on cosmology and gravitation. The style of the text is that of a lightly written descriptive summary of ideas with almost no formulas, with pointers to the literature. We hope this style can encourage new people to take a look into these results. W... |
2101.07686 | Giorgio Carelli | Andrea Basti, Nicol\`o Beverini, Filippo Bosi, Giorgio Carelli,
Donatella Ciampini, Angela D.V. Di Virgilio, Francesco Fuso, Umberto
Giacomelli, Enrico Maccioni, Paolo Marsili, Giuseppe Passeggio, Alberto
Porzio, Andreino Simonelli and Giuseppe Terreni | Effects of temperature variations in high sensitivity Sagnac gyroscope | 11 pages, 7 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | GINGERINO is one of the most sensitive Sagnac laser-gyroscope based on an
heterolithic mechanical structure. It is a prototype for GINGER, the laser
gyroscopes array proposed to reconstruct the Earth rotation vector and in this
way to measure General Relativity effects. Many factors affect the final
sensitivity of la... | [
{
"created": "Tue, 19 Jan 2021 15:26:27 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2021 09:28:57 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Mar 2021 11:30:58 GMT",
"version": "v3"
}
] | 2021-03-22 | [
[
"Basti",
"Andrea",
""
],
[
"Beverini",
"Nicolò",
""
],
[
"Bosi",
"Filippo",
""
],
[
"Carelli",
"Giorgio",
""
],
[
"Ciampini",
"Donatella",
""
],
[
"Di Virgilio",
"Angela D. V.",
""
],
[
"Fuso",
"Francesco",
... | GINGERINO is one of the most sensitive Sagnac laser-gyroscope based on an heterolithic mechanical structure. It is a prototype for GINGER, the laser gyroscopes array proposed to reconstruct the Earth rotation vector and in this way to measure General Relativity effects. Many factors affect the final sensitivity of lase... |
1606.05116 | Theodosios Christodoulakis | N. Dimakis, Petros A. Terzis, Adamantia Zampeli, T. Christodoulakis | Decoupling of the re-parametrization degree of freedom and a generalized
probability in quantum cosmology | 19 pages, tex source file, no figures | Phys. Rev. D 94, 064013 (2016) | 10.1103/PhysRevD.94.064013 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The high degree of symmetry renders the dynamics of cosmological as well as
some black hole spacetimes describable by a system of finite degrees of
freedom. These systems are generally known as minisuperspace models. One of
their important key features is the invariance of the corresponding reduced
actions under repa... | [
{
"created": "Thu, 16 Jun 2016 09:50:35 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Sep 2016 11:28:12 GMT",
"version": "v2"
}
] | 2016-09-14 | [
[
"Dimakis",
"N.",
""
],
[
"Terzis",
"Petros A.",
""
],
[
"Zampeli",
"Adamantia",
""
],
[
"Christodoulakis",
"T.",
""
]
] | The high degree of symmetry renders the dynamics of cosmological as well as some black hole spacetimes describable by a system of finite degrees of freedom. These systems are generally known as minisuperspace models. One of their important key features is the invariance of the corresponding reduced actions under repara... |
1403.1843 | Adam Pound | Adam Pound and Jeremy Miller | A practical, covariant puncture for second-order self-force calculations | 23 pages, 1 figure, final version to be published in Phys Rev D | Phys. Rev. D 89, 104020 (2014) | 10.1103/PhysRevD.89.104020 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurately modeling an extreme-mass-ratio inspiral requires knowledge of the
second-order gravitational self-force on the inspiraling small object.
Recently, numerical puncture schemes have been formulated to calculate this
force, and their essential analytical ingredients have been derived from first
principles. How... | [
{
"created": "Fri, 7 Mar 2014 19:09:19 GMT",
"version": "v1"
},
{
"created": "Fri, 2 May 2014 17:08:16 GMT",
"version": "v2"
}
] | 2014-05-21 | [
[
"Pound",
"Adam",
""
],
[
"Miller",
"Jeremy",
""
]
] | Accurately modeling an extreme-mass-ratio inspiral requires knowledge of the second-order gravitational self-force on the inspiraling small object. Recently, numerical puncture schemes have been formulated to calculate this force, and their essential analytical ingredients have been derived from first principles. Howev... |
gr-qc/9902022 | Sibusiso Xulu | S. S. Xulu (University of Zululand) | Energy Associated with Schwarzschild Black Hole in a Magnetic Universe | RevTex, 8 pages, no figures, a few points are clarified, to appear in
Int. J. Mod. Phys. A. This paper is dedicated to Professor G. F. R. Ellis on
the occasion of his 60th birthday | Int.J.Mod.Phys.A15:2979-2986,2000 | 10.1142/S0217751X00001713 | null | gr-qc | null | In this paper we obtain the energy distribution associated with the Ernst
space-time (geometry describing Schwarzschild black hole in Melvin's magnetic
universe) in Einstein's prescription. The first term is the rest-mass energy of
the Schwarzschild black hole, the second term is the classical value for the
energy of... | [
{
"created": "Tue, 9 Feb 1999 15:47:33 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Jan 2000 11:09:16 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Xulu",
"S. S.",
"",
"University of Zululand"
]
] | In this paper we obtain the energy distribution associated with the Ernst space-time (geometry describing Schwarzschild black hole in Melvin's magnetic universe) in Einstein's prescription. The first term is the rest-mass energy of the Schwarzschild black hole, the second term is the classical value for the energy of t... |
1702.01029 | Stefan Danilishin L. | Stefan L. Danilishin, Eugene Knyazev, Nikita V. Voronchev, Farid Ya.
Khalili, Christian Gr\"af, Sebastian Steinlechner, Jan-Simon Hennig and
Stefan Hild | A new type of quantum speed meter interferometer: measuring speed to
search for intermediate mass black holes | 8 pages, 5 figures. Modified figures and text in v2 | null | 10.1038/s41377-018-0004-2 | LIGO-P1700008 | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent discovery of gravitational waves (GW) by LIGO has impressively
launched the novel field of gravitational astronomy and it allowed us to
glimpse at exciting objects we could so far only speculate about. Further
sensitivity improvements at the low frequency end of the detection band of
future GW observatorie... | [
{
"created": "Fri, 3 Feb 2017 14:45:10 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Mar 2017 17:49:50 GMT",
"version": "v2"
}
] | 2018-06-05 | [
[
"Danilishin",
"Stefan L.",
""
],
[
"Knyazev",
"Eugene",
""
],
[
"Voronchev",
"Nikita V.",
""
],
[
"Khalili",
"Farid Ya.",
""
],
[
"Gräf",
"Christian",
""
],
[
"Steinlechner",
"Sebastian",
""
],
[
"Hennig",
"Jan... | The recent discovery of gravitational waves (GW) by LIGO has impressively launched the novel field of gravitational astronomy and it allowed us to glimpse at exciting objects we could so far only speculate about. Further sensitivity improvements at the low frequency end of the detection band of future GW observatories ... |
2304.08270 | Grigalius Taujanskas | Grigalius Taujanskas and Juan A. Valiente Kroon | Controlled regularity at future null infinity from past asymptotic
initial data: massless fields | 42 pages, improved introduction and referencing, typos fixed,
clarified statement of main theorem and concluding remarks | null | null | null | gr-qc math.AP | http://creativecommons.org/licenses/by/4.0/ | We study the relationship between asymptotic characteristic initial data at
past null infinity and the regularity of solutions at future null infinity for
the massless linear spin-s field equations on Minkowski space. By
quantitatively controlling the solutions on a causal rectangle reaching the
conformal boundary, w... | [
{
"created": "Mon, 17 Apr 2023 13:26:51 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 11:34:59 GMT",
"version": "v2"
}
] | 2023-09-08 | [
[
"Taujanskas",
"Grigalius",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | We study the relationship between asymptotic characteristic initial data at past null infinity and the regularity of solutions at future null infinity for the massless linear spin-s field equations on Minkowski space. By quantitatively controlling the solutions on a causal rectangle reaching the conformal boundary, we ... |
gr-qc/0503109 | Gregory J. Galloway | Abhay Ashtekar and Gregory J. Galloway | Some uniqueness results for dynamical horizons | 26 pages, 4 figures, v4: references updated, minor corrections, to
appear in Advances in Theoretical and Mathematical Physics | Adv.Theor.Math.Phys. 9 (2005) 1-30 | null | null | gr-qc math.DG | null | We first show that the intrinsic, geometrical structure of a dynamical
horizon is unique. A number of physically interesting constraints are then
established on the location of trapped and marginally trapped surfaces in the
vicinity of any dynamical horizon. These restrictions are used to prove several
uniqueness the... | [
{
"created": "Sat, 26 Mar 2005 13:40:54 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Apr 2005 01:06:00 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Jun 2005 21:24:32 GMT",
"version": "v3"
},
{
"created": "Fri, 11 Nov 2005 11:53:10 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Galloway",
"Gregory J.",
""
]
] | We first show that the intrinsic, geometrical structure of a dynamical horizon is unique. A number of physically interesting constraints are then established on the location of trapped and marginally trapped surfaces in the vicinity of any dynamical horizon. These restrictions are used to prove several uniqueness theor... |
1205.3421 | Kazuharu Bamba | Kazuharu Bamba, Salvatore Capozziello, Shin'ichi Nojiri and Sergei D.
Odintsov | Dark energy cosmology: the equivalent description via different
theoretical models and cosmography tests | 160 pages, 4 figures, Invited Review, to appear in Astrophysics and
Space Science | Astrophysics and Space Science (2012) 342:155-228 | 10.1007/s10509-012-1181-8 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review different dark energy cosmologies. In particular, we present the
$\Lambda$CDM cosmology, Little Rip and Pseudo-Rip universes, the phantom and
quintessence cosmologies with Type I, II, III and IV finite-time future
singularities and non-singular dark energy universes. In the first part, we
explain the $\Lamb... | [
{
"created": "Mon, 14 May 2012 13:41:15 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jun 2012 02:35:32 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Jul 2012 10:21:41 GMT",
"version": "v3"
}
] | 2012-10-03 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | We review different dark energy cosmologies. In particular, we present the $\Lambda$CDM cosmology, Little Rip and Pseudo-Rip universes, the phantom and quintessence cosmologies with Type I, II, III and IV finite-time future singularities and non-singular dark energy universes. In the first part, we explain the $\Lambda... |
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