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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1305.6838 | Ruxandra Bondarescu | Ruxandra Bondarescu (University of Zurich), Andrew P. Lundgren (Max
Planck Institute for Gravitational Physics), and Mihai Bondarescu
(Universitatea de Vest and University of Mississippi) | The Physics of the Far Future | 3 pages, no figures. Proceeding for the 13th Marcel Grossmann Meeting
in Stockholm, Sweden | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We observe the past and present of the universe, but can we predict the far
future? Observations suggest that in thousands of billions of years from now
most matter and radiation will be absorbed by the cosmological horizon. As it
absorbs the contents of the universe, the cosmological horizon is pushed
further and fu... | [
{
"created": "Wed, 29 May 2013 15:59:16 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Bondarescu",
"Ruxandra",
"",
"University of Zurich"
],
[
"Lundgren",
"Andrew P.",
"",
"Max\n Planck Institute for Gravitational Physics"
],
[
"Bondarescu",
"Mihai",
"",
"Universitatea de Vest and University of Mississippi"
]
] | We observe the past and present of the universe, but can we predict the far future? Observations suggest that in thousands of billions of years from now most matter and radiation will be absorbed by the cosmological horizon. As it absorbs the contents of the universe, the cosmological horizon is pushed further and furt... |
1604.06248 | Edward Anderson | Edward Anderson | Kinematical Quantization | 9 pages, including 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider here kinematical quantization: a first and often overlooked step
in quantization procedures. $\mathbb{R}$, $\mathbb{R}_+$ and the interval are
considered, as well as direct (Cartesian) products thereof. Some simple
minisuperspace models, and mode by mode consideration of slightly inhomogeneous
cosmology, ... | [
{
"created": "Thu, 21 Apr 2016 10:31:58 GMT",
"version": "v1"
}
] | 2016-04-22 | [
[
"Anderson",
"Edward",
""
]
] | We consider here kinematical quantization: a first and often overlooked step in quantization procedures. $\mathbb{R}$, $\mathbb{R}_+$ and the interval are considered, as well as direct (Cartesian) products thereof. Some simple minisuperspace models, and mode by mode consideration of slightly inhomogeneous cosmology, ha... |
2205.02985 | Fernando Piza\~na | Fernando A. Piza\~na, Roberto A. Sussman and Juan Carlos Hidalgo | Gravitational Entropy in Szekeres Class I Models | null | null | 10.1088/1361-6382/ac851a | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational entropy is an elusive concept. Various theoretical proposals
have been presented, initially based on Penrose's Weyl Curvature Hypothesis,
and variations of it. A more recent proposal by Clifton, Ellis, and Tavakol
(CET) considered a novel approach by defining such entropy from a Gibbs
equation construct... | [
{
"created": "Fri, 6 May 2022 02:32:40 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2022 20:39:05 GMT",
"version": "v2"
}
] | 2022-08-03 | [
[
"Pizaña",
"Fernando A.",
""
],
[
"Sussman",
"Roberto A.",
""
],
[
"Hidalgo",
"Juan Carlos",
""
]
] | Gravitational entropy is an elusive concept. Various theoretical proposals have been presented, initially based on Penrose's Weyl Curvature Hypothesis, and variations of it. A more recent proposal by Clifton, Ellis, and Tavakol (CET) considered a novel approach by defining such entropy from a Gibbs equation constructed... |
2008.10455 | Daniel Bakucz Can\'ario | Daniel Bakucz Can\'ario, Sam Lloyd, Keith Horne, Chris A. Hooley | Infinite-redshift localized states of Dirac fermions under Einsteinian
gravity | 14 pages, 10 figures | Phys. Rev. D 102, 084049 (2020) | 10.1103/PhysRevD.102.084049 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a set of localized states for an even number of Dirac fermions
under Einsteinian gravity that have an infinite central redshift. Near the
center of the localized state the components of the Dirac spinor and the
spacetime metric all show simple power-law dependences on the radial distance;
further out the f... | [
{
"created": "Mon, 24 Aug 2020 13:56:21 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2020 09:29:19 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Canário",
"Daniel Bakucz",
""
],
[
"Lloyd",
"Sam",
""
],
[
"Horne",
"Keith",
""
],
[
"Hooley",
"Chris A.",
""
]
] | We present a set of localized states for an even number of Dirac fermions under Einsteinian gravity that have an infinite central redshift. Near the center of the localized state the components of the Dirac spinor and the spacetime metric all show simple power-law dependences on the radial distance; further out the fer... |
1203.2525 | Mikel Fern\'andez-M\'endez | Mikel Fern\'andez-M\'endez, Guillermo A. Mena Marug\'an, Javier
Olmedo, Jos\'e M. Velhinho | Unique Fock quantization of scalar cosmological perturbations | 19 pages, minor impovementes included, typos corrected | Phys. Rev. D 85, 103525 (2012) | 10.1103/PhysRevD.85.103525 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the ambiguities in the Fock quantization of the scalar
perturbations of a Friedmann-Lema\^{i}tre-Robertson-Walker model with a massive
scalar field as matter content. We consider the case of compact spatial
sections (thus avoiding infrared divergences), with the topology of a
three-sphere. After expand... | [
{
"created": "Mon, 12 Mar 2012 15:48:18 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2012 14:08:00 GMT",
"version": "v2"
}
] | 2012-06-21 | [
[
"Fernández-Méndez",
"Mikel",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
],
[
"Olmedo",
"Javier",
""
],
[
"Velhinho",
"José M.",
""
]
] | We investigate the ambiguities in the Fock quantization of the scalar perturbations of a Friedmann-Lema\^{i}tre-Robertson-Walker model with a massive scalar field as matter content. We consider the case of compact spatial sections (thus avoiding infrared divergences), with the topology of a three-sphere. After expandin... |
1011.3336 | Roberto Di Criscienzo | R. Casadio, S. Chiodini, A. Orlandi, G. Acquaviva, R. Di Criscienzo
and L. Vanzo | On the Unruh effect in de Sitter space | 8 pages; corrected typos; sections structure revised | Mod.Phys.Lett.A26:2149-2158,2011 | 10.1142/S0217732311036516 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an interpretation of the temperature in de Sitter universe in terms
of a dynamical Unruh effect associated with the Hubble sphere. As with the
quantum noise perceived by a uniformly accelerated observer in static
space-times, observers endowed with a proper motion can in principle detect the
effect. In partic... | [
{
"created": "Mon, 15 Nov 2010 10:40:04 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2011 11:34:25 GMT",
"version": "v2"
}
] | 2011-09-23 | [
[
"Casadio",
"R.",
""
],
[
"Chiodini",
"S.",
""
],
[
"Orlandi",
"A.",
""
],
[
"Acquaviva",
"G.",
""
],
[
"Di Criscienzo",
"R.",
""
],
[
"Vanzo",
"L.",
""
]
] | We give an interpretation of the temperature in de Sitter universe in terms of a dynamical Unruh effect associated with the Hubble sphere. As with the quantum noise perceived by a uniformly accelerated observer in static space-times, observers endowed with a proper motion can in principle detect the effect. In particul... |
1804.07516 | Yu-Ichi Takamizu | Yu-ichi Takamizu | Gradient expansion formalism for nonlinear superhorizon perturbations | 13 pages | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a theory of nonlinear cosmological perturbations on superhorizon
scales where a characteristic length scale of perturbations is longer than the
Hubble radius, in general theoretical frameworks. Our formalism is based on the
spatial gradient expansion approach by adopting the ADM decomposition.
Nonlinear su... | [
{
"created": "Fri, 20 Apr 2018 09:35:05 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Apr 2018 03:22:38 GMT",
"version": "v2"
}
] | 2018-04-24 | [
[
"Takamizu",
"Yu-ichi",
""
]
] | We develop a theory of nonlinear cosmological perturbations on superhorizon scales where a characteristic length scale of perturbations is longer than the Hubble radius, in general theoretical frameworks. Our formalism is based on the spatial gradient expansion approach by adopting the ADM decomposition. Nonlinear supe... |
1604.03363 | Runqiu Yang | Zhoujian Cao, Rong-Gen Cai, Run-Qiu Yang | Multi-horizon and Critical Behavior in Gravitational Collapse of
Massless Scalar | 5 pages, 3 figures | null | null | null | gr-qc hep-th physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the whole process of gravitational collapse and accretion
of a massless scalar field in asymptotically flat spacetime. Two kinds of
initial configurations are considered. One is the initial data without black
hole, the other contains a black hole. Under suitable initial conditions, we
find that mul... | [
{
"created": "Tue, 12 Apr 2016 12:15:33 GMT",
"version": "v1"
}
] | 2016-04-13 | [
[
"Cao",
"Zhoujian",
""
],
[
"Cai",
"Rong-Gen",
""
],
[
"Yang",
"Run-Qiu",
""
]
] | This paper studies the whole process of gravitational collapse and accretion of a massless scalar field in asymptotically flat spacetime. Two kinds of initial configurations are considered. One is the initial data without black hole, the other contains a black hole. Under suitable initial conditions, we find that multi... |
1406.3775 | Vassilis S. Geroyannis | Vassilis Geroyannis, Georgios Kleftogiannis | Radial pulsations of neutron stars: computing alternative polytropic
models regarding density and adiabatic index | 19 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the problem of radial pulsations of neutron stars by computing
four general-relativistic polytropic models, in which "density" and "adiabatic
index" are involved with their discrete meanings: (i) "rest-mass density" or
(ii) "mass-energy density" regarding the density, and (i) "constant" or (ii)
"variable" ... | [
{
"created": "Sat, 14 Jun 2014 21:30:31 GMT",
"version": "v1"
}
] | 2014-06-17 | [
[
"Geroyannis",
"Vassilis",
""
],
[
"Kleftogiannis",
"Georgios",
""
]
] | We revisit the problem of radial pulsations of neutron stars by computing four general-relativistic polytropic models, in which "density" and "adiabatic index" are involved with their discrete meanings: (i) "rest-mass density" or (ii) "mass-energy density" regarding the density, and (i) "constant" or (ii) "variable" re... |
1503.07536 | Yosef Zlochower | Yosef Zlochower, Carlos O. Lousto | Modeling the remnant mass, spin, and recoil from unequal-mass,
precessing black-hole binaries: The Intermediate Mass Ratio Regime | New version includes correction for errors in the published version
(see Erratum Phys. Rev. D 94, 029901 (2016)) | Phys. Rev. D 92, 024022 (2015) | 10.1103/PhysRevD.92.024022 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the modeling of the properties of the remnant black hole resulting
the merger of a black-hole binary as a function of the parameters of the
binary. We provide a set of empirical formulas for the final mass, spin and
recoil velocity of the final black hole as a function of the mass ratio and
individual spin... | [
{
"created": "Wed, 25 Mar 2015 20:02:11 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 2015 17:42:51 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jul 2016 16:19:14 GMT",
"version": "v3"
}
] | 2016-07-21 | [
[
"Zlochower",
"Yosef",
""
],
[
"Lousto",
"Carlos O.",
""
]
] | We revisit the modeling of the properties of the remnant black hole resulting the merger of a black-hole binary as a function of the parameters of the binary. We provide a set of empirical formulas for the final mass, spin and recoil velocity of the final black hole as a function of the mass ratio and individual spins ... |
1708.03860 | Salvador Robles-Perez | Salvador J. Robles-P\'erez | Cosmological perturbations in the entangled inflationary universe | 10 pages | Phys. Rev. D 97, 066018 (2018) | 10.1103/PhysRevD.97.066018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it is presented the model of a multiverse made up of universes
which are created in entangled pairs that conserve the total momentum
conjugated to the scale factor. For the background spacetime it is assumed a
FRW metric with a scalar field with mass $m$ minimally coupled to gravity. For
the fields that... | [
{
"created": "Sun, 13 Aug 2017 06:18:23 GMT",
"version": "v1"
}
] | 2018-03-28 | [
[
"Robles-Pérez",
"Salvador J.",
""
]
] | In this paper it is presented the model of a multiverse made up of universes which are created in entangled pairs that conserve the total momentum conjugated to the scale factor. For the background spacetime it is assumed a FRW metric with a scalar field with mass $m$ minimally coupled to gravity. For the fields that p... |
gr-qc/9901052 | Maria da Conceicao Bento | M. C. Bento | Cosmological Solutions of Type II Superstrings | 11 pages, Latex, no figures | Phys.Lett. B452 (1999) 240-243 | 10.1016/S0370-2693(99)00319-6 | DF/IST-2.98 | gr-qc | null | We study maximally symmetric cosmological solutions of type II supersymmetric
strings in the presence of the exact quartic curvature corrections to the
lowest order effective action, including loop and D-instanton effects. We find
that, unlike the case of type IIA theories, de Sitter solutions exist for type
IIB supe... | [
{
"created": "Tue, 19 Jan 1999 12:05:25 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bento",
"M. C.",
""
]
] | We study maximally symmetric cosmological solutions of type II supersymmetric strings in the presence of the exact quartic curvature corrections to the lowest order effective action, including loop and D-instanton effects. We find that, unlike the case of type IIA theories, de Sitter solutions exist for type IIB supers... |
2403.18543 | Emanuel Gallo | Jonathan Claros and Emanuel Gallo | Accurate analytical modeling of light rays in spherically symmetric
spacetimes: Applications in the study of black hole accretion disks and
polarimetry | Published version. Minor typos in two equations corrected | Phys. Rev. D 109, 124055 (2024) | 10.1103/PhysRevD.109.124055 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new, simple analytical formulas to accurately describe light rays
in spherically symmetric static spacetimes. These formulas extend those
introduced by Beloborodov and refined by Poutanen for the Schwarzschild metric.
Our enhanced formulas are designed to be applicable to a broader range of
spacetimes, mak... | [
{
"created": "Wed, 27 Mar 2024 13:23:07 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Apr 2024 18:42:07 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jun 2024 14:36:52 GMT",
"version": "v3"
}
] | 2024-06-25 | [
[
"Claros",
"Jonathan",
""
],
[
"Gallo",
"Emanuel",
""
]
] | We present new, simple analytical formulas to accurately describe light rays in spherically symmetric static spacetimes. These formulas extend those introduced by Beloborodov and refined by Poutanen for the Schwarzschild metric. Our enhanced formulas are designed to be applicable to a broader range of spacetimes, makin... |
1708.03737 | Yuan Zhong | Yuan Zhong, Ke Yang and Yu-Xiao Liu | Linearization of a warped $f(R)$ theory in the higher-order frame II:
the equation of motion approach | 12 pages | Phys. Rev. D 97, 044032 (2018) | 10.1103/PhysRevD.97.044032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Without using conformal transformation, a simple type of five-dimensional
$f(R)-$brane model is linearized directly in its higher-order frame. In this
paper, the linearization is conducted in the equation of motion approach. We
first derive all the linear perturbation equations without specifying a gauge
condition. T... | [
{
"created": "Sat, 12 Aug 2017 02:19:18 GMT",
"version": "v1"
}
] | 2018-02-28 | [
[
"Zhong",
"Yuan",
""
],
[
"Yang",
"Ke",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Without using conformal transformation, a simple type of five-dimensional $f(R)-$brane model is linearized directly in its higher-order frame. In this paper, the linearization is conducted in the equation of motion approach. We first derive all the linear perturbation equations without specifying a gauge condition. The... |
1102.5284 | Mario La Camera | M. La Camera | On thin-shell wormholes evolving in flat FRW spacetimes | 8 pages; to appear in MPLA | Mod.Phys.Lett.A26:857-863,2011 | 10.1142/S0217732311035407 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analize the stability of a class of thin-shell wormholes with spherical
symmetry evolving in flat FRW spacetimes. The wormholes considered here are
supported at the throat by a perfect fluid with equation of state
$\mathcal{P}=w\sigma$ and have a physical radius equal to $aR$, where $a$ is a
time-dependent functio... | [
{
"created": "Fri, 25 Feb 2011 16:16:05 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"La Camera",
"M.",
""
]
] | We analize the stability of a class of thin-shell wormholes with spherical symmetry evolving in flat FRW spacetimes. The wormholes considered here are supported at the throat by a perfect fluid with equation of state $\mathcal{P}=w\sigma$ and have a physical radius equal to $aR$, where $a$ is a time-dependent function ... |
gr-qc/0011029 | Coire Cadeau | C. Cadeau and E. Woolgar | New Five Dimensional Black Holes Classified by Horizon Geometry, and a
Bianchi VI Braneworld | LaTeX, 20 pages, 2 figures Typographical errors corrected, and
references to printed matter added in favour of preprints where possible | Class.Quant.Grav. 18 (2001) 527-542 | 10.1088/0264-9381/18/3/312 | null | gr-qc hep-th | null | We introduce two new families of solutions to the vacuum Einstein equations
with negative cosmological constant in 5 dimensions. These solutions are static
black holes whose horizons are modelled on the 3-geometries nilgeometry and
solvegeometry. Thus the horizons (and the exterior spacetimes) can be foliated
by comp... | [
{
"created": "Tue, 7 Nov 2000 22:29:47 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jan 2001 19:06:07 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Cadeau",
"C.",
""
],
[
"Woolgar",
"E.",
""
]
] | We introduce two new families of solutions to the vacuum Einstein equations with negative cosmological constant in 5 dimensions. These solutions are static black holes whose horizons are modelled on the 3-geometries nilgeometry and solvegeometry. Thus the horizons (and the exterior spacetimes) can be foliated by compac... |
1610.04682 | Aur\'elien Hees | Aur\'elien Hees and Quentin G. Bailey and Adrien Bourgoin and
H\'el\`ene Pihan-Le Bars and Christine Guerlin and Christophe Le
Poncin-Lafitte | Tests of Lorentz symmetry in the gravitational sector | 40 pages, 2 figures, version accepted for publication in Universe | Universe 2016, 2(4), 30 | 10.3390/universe2040030 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz symmetry is one of the pillars of both General Relativity and the
Standard Model of particle physics. Motivated by ideas about quantum gravity,
unification theories and violations of CPT symmetry, a significant effort has
been put the last decades into testing Lorentz symmetry. This review focuses on
Lorentz ... | [
{
"created": "Sat, 15 Oct 2016 02:56:24 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 2016 01:00:39 GMT",
"version": "v2"
}
] | 2016-12-02 | [
[
"Hees",
"Aurélien",
""
],
[
"Bailey",
"Quentin G.",
""
],
[
"Bourgoin",
"Adrien",
""
],
[
"Bars",
"Hélène Pihan-Le",
""
],
[
"Guerlin",
"Christine",
""
],
[
"Poncin-Lafitte",
"Christophe Le",
""
]
] | Lorentz symmetry is one of the pillars of both General Relativity and the Standard Model of particle physics. Motivated by ideas about quantum gravity, unification theories and violations of CPT symmetry, a significant effort has been put the last decades into testing Lorentz symmetry. This review focuses on Lorentz sy... |
1310.7690 | Jia Wang | Wei Xu, Jia Wang and Xin-he Meng | The Entropy Sum of (A)dS Black Holes in Four and Higher Dimensions | 19 pages, 0 figures, some references added, conclusions improved, an
appendix added, correct typos, published version | Int.J.Mod.Phys. A, 29 (2014) 1450172 | 10.1142/S0217751X14501723 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the "entropy sum" relation of (A)dS charged black holes in higher
dimensional Einstein-Maxwell gravity, $f(R)$ gravity, Gauss-Bonnet gravity and
gauged supergravity. For their "entropy sum" with the necessary effect of the
un-physical "virtual" horizon included, we conclude the general results that
the cos... | [
{
"created": "Tue, 29 Oct 2013 06:02:24 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2014 14:15:46 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Dec 2014 11:04:12 GMT",
"version": "v3"
}
] | 2014-12-16 | [
[
"Xu",
"Wei",
""
],
[
"Wang",
"Jia",
""
],
[
"Meng",
"Xin-he",
""
]
] | We present the "entropy sum" relation of (A)dS charged black holes in higher dimensional Einstein-Maxwell gravity, $f(R)$ gravity, Gauss-Bonnet gravity and gauged supergravity. For their "entropy sum" with the necessary effect of the un-physical "virtual" horizon included, we conclude the general results that the cosmo... |
1511.04364 | Nobuyoshi Komatsu | Nobuyoshi Komatsu and Shigeo Kimura | General form of entropy on the horizon of the universe in entropic
cosmology | Final version accepted for publication in PRD. Several pasragraphs
and references are added and corrected. [10 pages] | Phys. Rev. D 93, 043530 (2016) | 10.1103/PhysRevD.93.043530 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Entropic cosmology assumes several forms of entropy on the horizon of the
universe, where the entropy can be considered to behave as if it were related
to the exchange (the transfer) of energy. To discuss this exchangeability, the
consistency of the two continuity equations obtained from two different methods
is exam... | [
{
"created": "Thu, 12 Nov 2015 04:55:07 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2016 10:09:49 GMT",
"version": "v2"
}
] | 2016-02-19 | [
[
"Komatsu",
"Nobuyoshi",
""
],
[
"Kimura",
"Shigeo",
""
]
] | Entropic cosmology assumes several forms of entropy on the horizon of the universe, where the entropy can be considered to behave as if it were related to the exchange (the transfer) of energy. To discuss this exchangeability, the consistency of the two continuity equations obtained from two different methods is examin... |
1501.02443 | Edward Anderson | Edward Anderson | Origin of Structure in the Universe: Quantum Cosmology Reconsidered | 12 pages, including 1 figure. This version has 7 new pages of
details, comments and references | Gen. Rel. Grav. 47 (2015) 101 | 10.1007/s10714-015-1938-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on a more careful canonical analysis, we motivate a reduced
quantization - in the sense of superspace quantization - of slightly
inhomogeneous cosmology in place of the Dirac quantization in the existing
literature, and provide it in the vacuum case. This is attained through
consideration of configuration space... | [
{
"created": "Sun, 11 Jan 2015 11:15:49 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Apr 2016 00:32:27 GMT",
"version": "v2"
}
] | 2016-04-05 | [
[
"Anderson",
"Edward",
""
]
] | Based on a more careful canonical analysis, we motivate a reduced quantization - in the sense of superspace quantization - of slightly inhomogeneous cosmology in place of the Dirac quantization in the existing literature, and provide it in the vacuum case. This is attained through consideration of configuration space g... |
2110.09538 | Alireza Talebian Ashkezari | Hassan Firouzjahi, Mohammad Ali Gorji, Shinji Mukohyama and Alireza
Talebian | Dark Matter from Entropy Perturbations in Curved Field Space | 26+7 pages, 8 figures, 2 appendices, matches published version | null | 10.1103/PhysRevD.105.043501 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The accumulated energy density of the excited entropy modes in multiple field
inflationary scenarios can play the role of dark matter. In the usual case of a
flat field space without any turning trajectory, only light superhorizon
entropy modes can be excited through the gravitational instability. In the case
of a ne... | [
{
"created": "Mon, 18 Oct 2021 18:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2022 10:13:27 GMT",
"version": "v2"
}
] | 2022-02-16 | [
[
"Firouzjahi",
"Hassan",
""
],
[
"Gorji",
"Mohammad Ali",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Talebian",
"Alireza",
""
]
] | The accumulated energy density of the excited entropy modes in multiple field inflationary scenarios can play the role of dark matter. In the usual case of a flat field space without any turning trajectory, only light superhorizon entropy modes can be excited through the gravitational instability. In the case of a nega... |
gr-qc/9805042 | Miguel A. G. Bonilla | Miguel \'A. G. Bonilla | Symmetric hyperbolic systems for Bianchi equations | latex, 7 pages, accepted for publication in Class. Quantum Grav | null | 10.1088/0264-9381/15/7/014 | null | gr-qc | null | We obtain a family of first-order symmetric hyperbolic systems for the
Bianchi equations. They have only physical characteristics: the light cone and
timelike hypersurfaces. In the proof of the hyperbolicity, new positivity
properties of the Bel tensor are used.
| [
{
"created": "Tue, 12 May 1998 17:33:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bonilla",
"Miguel Á. G.",
""
]
] | We obtain a family of first-order symmetric hyperbolic systems for the Bianchi equations. They have only physical characteristics: the light cone and timelike hypersurfaces. In the proof of the hyperbolicity, new positivity properties of the Bel tensor are used. |
gr-qc/0102061 | Jose A. Gonzalez | Jose A. Gonzalez and Daniel Sudarsky | Scalar solitons in a 4-Dimensional curved space-time | Accepted for publication in Revista Mexicana de Fisica, 6 pages, 2
figures | Rev.Mex.Fis. 47 (2001) 231-233 | null | null | gr-qc | null | There is a theorem known as a Virial theorem that restricts the possible
existence of non-trivial static solitary waves with scalar fields in a flat
space-time with 3 or more spatial dimensions. This raises the following
question: Does the analogous curved space-time version hold?. We investigate
the possibility of s... | [
{
"created": "Tue, 13 Feb 2001 18:51:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gonzalez",
"Jose A.",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | There is a theorem known as a Virial theorem that restricts the possible existence of non-trivial static solitary waves with scalar fields in a flat space-time with 3 or more spatial dimensions. This raises the following question: Does the analogous curved space-time version hold?. We investigate the possibility of sol... |
gr-qc/0703149 | Eugene J. Surowitz | Engelbert L. Schucking, Eugene J. Surowitz | Einstein's Apple: His First Principle of Equivalence | 41 pages, 12 figures, LaTeX + legacy/pictex ; V3 adds a footnote to
the title indicating inclusion of the text as chapters in a book and includes
the diagrams in the main file | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After a historical discussion of Einstein's 1907 principle of equivalence, a
homogeneous gravitational field in Minkowski spacetime is constructed. It is
pointed out that the reference frames in gravitational theory can be understood
as spaces with a flat connection and torsion defined through teleparallelism.
This k... | [
{
"created": "Thu, 29 Mar 2007 16:42:09 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2012 20:01:55 GMT",
"version": "v2"
}
] | 2012-08-13 | [
[
"Schucking",
"Engelbert L.",
""
],
[
"Surowitz",
"Eugene J.",
""
]
] | After a historical discussion of Einstein's 1907 principle of equivalence, a homogeneous gravitational field in Minkowski spacetime is constructed. It is pointed out that the reference frames in gravitational theory can be understood as spaces with a flat connection and torsion defined through teleparallelism. This kin... |
1305.5299 | Miguel Zilhao | Miguel Zilh\~ao, Frank L\"offler | An Introduction to the Einstein Toolkit | Lecture notes from the NRHEP spring school held at IST-Lisbon, March
2013. Extra material and notebooks available online at
http://blackholes.ist.utl.pt/nrhep2/ To be published by IJMPA (V. Cardoso, L.
Gualtieri, C. Herdeiro and U. Sperhake, Eds., 2013). v2: minor changes; added
figure | null | 10.1142/S0217751X13400149 | null | gr-qc physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an introduction to the Einstein Toolkit, a mature, open-source
computational infrastructure for numerical relativity based on the Cactus
Framework, for the target group of new users. This toolkit is composed of
several different modules, is developed by researchers from different
institutions throughout the w... | [
{
"created": "Thu, 23 May 2013 01:45:18 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jun 2013 15:04:43 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Zilhão",
"Miguel",
""
],
[
"Löffler",
"Frank",
""
]
] | We give an introduction to the Einstein Toolkit, a mature, open-source computational infrastructure for numerical relativity based on the Cactus Framework, for the target group of new users. This toolkit is composed of several different modules, is developed by researchers from different institutions throughout the wor... |
2205.05255 | Yu-Xiao Liu | Qin Tan, Wen-Di Guo, and Yu-Xiao Liu | Sound from extra dimension: quasinormal modes of thick brane | 10 pages, 6 figures, improved version | Phys.Rev.D 106 (2022) 044038 | 10.1103/PhysRevD.106.044038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the quasinormal modes of a thick brane system.
Considering the transverse-traceless tensor perturbation of the brane metric,
we obtain the Schr\"odinger-like equation of the Kaluza-Klein modes of the
tensor perturbation. Then we use the Wentzel-Kramers-Brillouin approximation
and the asym... | [
{
"created": "Wed, 11 May 2022 03:57:43 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Feb 2024 12:37:08 GMT",
"version": "v2"
}
] | 2024-02-21 | [
[
"Tan",
"Qin",
""
],
[
"Guo",
"Wen-Di",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | In this work, we investigate the quasinormal modes of a thick brane system. Considering the transverse-traceless tensor perturbation of the brane metric, we obtain the Schr\"odinger-like equation of the Kaluza-Klein modes of the tensor perturbation. Then we use the Wentzel-Kramers-Brillouin approximation and the asympt... |
gr-qc/0306041 | Janusz Garecki | Janusz Garecki | On Hypothesis of the Two Large Extradimensions | 7 pages, no figures, Revtex. This report was prepared as an Essay on
the 2003 Essay Competition by Gravity Research Foundation | null | null | null | gr-qc | null | Recently there was proposeda hypothesis about existence of the two large
extradimensions. This hypothesis demands, e.g., modification of Newton law at
submilimeter scale. In this brief report we show that this hypothesis cannot be
correct in presen formulation.
| [
{
"created": "Tue, 10 Jun 2003 13:27:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Garecki",
"Janusz",
""
]
] | Recently there was proposeda hypothesis about existence of the two large extradimensions. This hypothesis demands, e.g., modification of Newton law at submilimeter scale. In this brief report we show that this hypothesis cannot be correct in presen formulation. |
gr-qc/0403099 | Jose Geraldo Pereira | R. Aldrovandi, J. P. Beltran Almeida, J. G. Pereira | A Singular Conformal Spacetime | RevTeX4, 10 pages, 1 eps figure. Presentation changes, including a
new title; section II.E, on the thermodynamic properties of the de Sitter
horizon, completely revised. Version to be published in Journal of Geometry
and Physics | J.Geom.Phys. 56 (2006) 1042-1056 | 10.1016/j.geomphys.2005.06.004 | null | gr-qc hep-th | null | The infinite cosmological "constant" limit of the de Sitter solutions to
Einstein's equation is studied. The corresponding spacetime is a singular,
four-dimensional cone-space, transitive under proper conformal transformations,
which constitutes a new example of maximally-symmetric spacetime. Grounded on
its geometri... | [
{
"created": "Wed, 24 Mar 2004 16:44:31 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2005 17:56:50 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Aldrovandi",
"R.",
""
],
[
"Almeida",
"J. P. Beltran",
""
],
[
"Pereira",
"J. G.",
""
]
] | The infinite cosmological "constant" limit of the de Sitter solutions to Einstein's equation is studied. The corresponding spacetime is a singular, four-dimensional cone-space, transitive under proper conformal transformations, which constitutes a new example of maximally-symmetric spacetime. Grounded on its geometric ... |
0905.0346 | Patryk Mach | Patryk Mach | On the stability of steady general-relativistic accretion and analogue
black holes | A talk given at The Jubilee 40th Symposium an Mathematical Physics
"Geometry & Quanta", Torun, June 25-28 2008. To be published in Reports on
Mathematical Physics | null | 10.1016/S0034-4877(09)90031-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Investigation of general-relativistic spherically symmetric steady accretion
of self-gravitating perfect fluid onto compact objects reveals the existence of
two weakly accreting regimes. In the first (corresponding to the test fluid
approximation) the mass of the central object is much larger than the mass of
the acc... | [
{
"created": "Mon, 4 May 2009 10:29:21 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Mach",
"Patryk",
""
]
] | Investigation of general-relativistic spherically symmetric steady accretion of self-gravitating perfect fluid onto compact objects reveals the existence of two weakly accreting regimes. In the first (corresponding to the test fluid approximation) the mass of the central object is much larger than the mass of the accre... |
0801.1347 | Xiaoning Wu | Xiaoning Wu, Chao-Guang Huang and Jia-Rui Sun | On Gravitational anomaly and Hawking radiation near weakly isolated
horizon | 14 pages | Phys.Rev.D77:124023,2008 | 10.1103/PhysRevD.77.124023 | null | gr-qc | null | Based on the idea of the work by Wilczek and his collaborators, we consider
the gravitational anomaly near weekly isolated horizon. We find that there
exists a universal choice of tortoise coordinate for any weakly isolated
horizon. Under this coordinate, the leading behavior of a quite arbitrary
scalar field near ho... | [
{
"created": "Wed, 9 Jan 2008 02:12:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Wu",
"Xiaoning",
""
],
[
"Huang",
"Chao-Guang",
""
],
[
"Sun",
"Jia-Rui",
""
]
] | Based on the idea of the work by Wilczek and his collaborators, we consider the gravitational anomaly near weekly isolated horizon. We find that there exists a universal choice of tortoise coordinate for any weakly isolated horizon. Under this coordinate, the leading behavior of a quite arbitrary scalar field near hori... |
0709.0305 | Jose M. M. Senovilla | Miguel S\'anchez and Jos\'e M. M. Senovilla | A note on the uniqueness of global static decompositions | 6 pages, no figures | Class.Quant.Grav.24:6121-6126,2007 | 10.1088/0264-9381/24/23/N01 | null | gr-qc | null | We discuss when static Killing vector fields are standard, that is, leading
to a global orthogonal splitting of the spacetime. We prove that such an
orthogonal splitting is unique whenever the natural space is compact. This is
carried out by proving that many notable spacelike submanifolds must be
contained in an ort... | [
{
"created": "Mon, 3 Sep 2007 21:40:59 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Sánchez",
"Miguel",
""
],
[
"Senovilla",
"José M. M.",
""
]
] | We discuss when static Killing vector fields are standard, that is, leading to a global orthogonal splitting of the spacetime. We prove that such an orthogonal splitting is unique whenever the natural space is compact. This is carried out by proving that many notable spacelike submanifolds must be contained in an ortho... |
2001.03221 | Dmitri Gal'tsov | Dmitri Gal'tsov | Conformal and kinetic couplings as two Jordan frames of the same theory | 25 pages | null | 10.1140/epjc/s10052-020-8017-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-minimal scalar-tensor (ST) theories may admit an Einstein frame
representation, where gravity is described by the Einstein-Hilbert action plus
the scalar sector. Some STs become just {\em minimal} Einstein-scalar (MES)
theories, notable examples are Brans-Dicke and $R\phi^2$. ST theories with {\em
derivative} cou... | [
{
"created": "Thu, 9 Jan 2020 20:59:12 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Gal'tsov",
"Dmitri",
""
]
] | Non-minimal scalar-tensor (ST) theories may admit an Einstein frame representation, where gravity is described by the Einstein-Hilbert action plus the scalar sector. Some STs become just {\em minimal} Einstein-scalar (MES) theories, notable examples are Brans-Dicke and $R\phi^2$. ST theories with {\em derivative} coupl... |
2002.03634 | Rajani K.V | Rajani.K.V, C.L.Ahmed Rizwan, A.Naveena Kumara, Deepak Vaid, Md.Sabir
Ali | Joule-Thomson Expansion of Regular Bardeen AdS Black Hole Surrounded by
Static Anisotropic Quintessence Field | 19 Pages | null | 10.1016/j.dark.2021.100825 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper, we investigate the required anisotropy of an exact
regular Bardeen black hole characterized by its mass $M$, the nonlinear
parameter $g$, the quintessence field parameter $a$ in anti-de sitter spacetime
with a static quintessence matter field. We also show that the relative
pressure anisotropy, ... | [
{
"created": "Mon, 10 Feb 2020 10:20:31 GMT",
"version": "v1"
}
] | 2021-05-11 | [
[
"K.",
"Rajani.",
"V"
],
[
"Rizwan",
"C. L. Ahmed",
""
],
[
"Kumara",
"A. Naveena",
""
],
[
"Vaid",
"Deepak",
""
],
[
"Ali",
"Md. Sabir",
""
]
] | In the present paper, we investigate the required anisotropy of an exact regular Bardeen black hole characterized by its mass $M$, the nonlinear parameter $g$, the quintessence field parameter $a$ in anti-de sitter spacetime with a static quintessence matter field. We also show that the relative pressure anisotropy, eq... |
0809.3651 | Ozay Gurtug | Ozay Gurtug and Mustafa Halilsoy | Colliding Wave Solutions in a Symmetric Non-metric Theory | 16 pages, 1 ps figure, It will appear in Int. Jour. of Theor. Physics | Int.J.Theor.Phys.48:139-149,2009 | 10.1007/s10773-008-9789-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method is given to generate the non-linear interaction (collision) of
linearly polarized gravity coupled torsion waves in a non-metric theory.
Explicit examples are given in which strong mutual focussing of gravitational
waves containing impulsive and shock components coupled with torsion waves does
not result in a... | [
{
"created": "Mon, 22 Sep 2008 08:37:33 GMT",
"version": "v1"
}
] | 2009-02-19 | [
[
"Gurtug",
"Ozay",
""
],
[
"Halilsoy",
"Mustafa",
""
]
] | A method is given to generate the non-linear interaction (collision) of linearly polarized gravity coupled torsion waves in a non-metric theory. Explicit examples are given in which strong mutual focussing of gravitational waves containing impulsive and shock components coupled with torsion waves does not result in a c... |
0908.4108 | Sergei Kopeikin | Sergei M. Kopeikin (University of Missouri-Columbia, USA) | Beyond the Standard IAU Framework | 9 pages, no figures, submitted to the proceedings of the IAU 261
Symposium "Relativity in Fundamental Astronomy: Dynamics, Reference Frames,
and Data Analysis"", Virginia Beach, USA; May 2009 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss three conceivable scenarios of extension and/or modification of
the IAU relativistic resolutions on time scales and spatial coordinates beyond
the Standard IAU Framework. These scenarios include: (1) the formalism of the
monopole and dipole moment transformations of the metric tensor replacing the
scale tr... | [
{
"created": "Thu, 27 Aug 2009 23:35:10 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2009 19:12:30 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Kopeikin",
"Sergei M.",
"",
"University of Missouri-Columbia, USA"
]
] | We discuss three conceivable scenarios of extension and/or modification of the IAU relativistic resolutions on time scales and spatial coordinates beyond the Standard IAU Framework. These scenarios include: (1) the formalism of the monopole and dipole moment transformations of the metric tensor replacing the scale tran... |
2209.00284 | Kamiel Janssens | Kamiel Janssens, Matthew Ball, Robert M. S. Schofield, Nelson
Christensen, Raymond Frey, Nick van Remortel, Sharan Banagiri, Michael W.
Coughlin, Anamaria Effler, Mark Go{\l}kowski, Jerzy Kubisz, and Micha{\l}
Ostrowski | Correlated 1-1000 Hz magnetic field fluctuations from lightning over
earth-scale distances and their impact on gravitational wave searches | null | null | 10.1103/PhysRevD.107.022004 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report Earth-scale distance magnetic correlations from lightning strokes
in the frequency range 1-1000 Hz at several distances ranging from 1100 to 9000
km. Noise sources which are correlated on Earth-scale distances can affect
future searches for gravitational-wave signals with ground-based
gravitational-wave int... | [
{
"created": "Thu, 1 Sep 2022 08:05:41 GMT",
"version": "v1"
}
] | 2023-01-25 | [
[
"Janssens",
"Kamiel",
""
],
[
"Ball",
"Matthew",
""
],
[
"Schofield",
"Robert M. S.",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Frey",
"Raymond",
""
],
[
"van Remortel",
"Nick",
""
],
[
"Banagiri",
"Sharan",
... | We report Earth-scale distance magnetic correlations from lightning strokes in the frequency range 1-1000 Hz at several distances ranging from 1100 to 9000 km. Noise sources which are correlated on Earth-scale distances can affect future searches for gravitational-wave signals with ground-based gravitational-wave inter... |
2108.10033 | Adrian Macquet | Adrian Macquet, Marie-Anne Bizouard, Nelson Christensen and Michael
Coughlin | Searches for long-duration gravitational wave transients in LIGO and
Virgo data | contribution to the 2021 Gravitation session of the 55th Rencontres
de Moriond | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Long-lived gravitational wave (GW) transients have received interest in the
last decade, as the sensitivity of LIGO and Virgo increases. Such signals,
lasting between 10 and 1000s, can come from a variety of sources, including
accretion disk instabilities around black holes, binary neutron stars
post-merger, core-col... | [
{
"created": "Mon, 23 Aug 2021 09:50:20 GMT",
"version": "v1"
}
] | 2021-08-24 | [
[
"Macquet",
"Adrian",
""
],
[
"Bizouard",
"Marie-Anne",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Coughlin",
"Michael",
""
]
] | Long-lived gravitational wave (GW) transients have received interest in the last decade, as the sensitivity of LIGO and Virgo increases. Such signals, lasting between 10 and 1000s, can come from a variety of sources, including accretion disk instabilities around black holes, binary neutron stars post-merger, core-colla... |
1004.1293 | Christian Corda cordac | Christian Corda | Gravitational waves astronomy: the ultimate test for Einstein's General
Relativity | Review commissioned by Nova Science Publishers, accepted for
publication in the edited collection "Gravitational Waves: a challenging new
window to the Universe", Editors C. Corda and Herman J. Mosquera Cuesta | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that Einstein's General Relativity (GR) achieved a great
success and overcame lots of experimental tests. On the other hand, GR also
showed some shortcomings and flaws which today advise theorists to ask if it is
the definitive theory of gravity. In this review we show that, if advanced
projects on t... | [
{
"created": "Thu, 8 Apr 2010 09:39:55 GMT",
"version": "v1"
}
] | 2010-04-09 | [
[
"Corda",
"Christian",
""
]
] | It is well known that Einstein's General Relativity (GR) achieved a great success and overcame lots of experimental tests. On the other hand, GR also showed some shortcomings and flaws which today advise theorists to ask if it is the definitive theory of gravity. In this review we show that, if advanced projects on the... |
2405.01998 | David Rumler | David Rumler | Circular geodesic orbits in the equatorial plane of a charged rotating
disc of dust | 12 pages, 8 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Equatorial circular geodesic orbits of neutral test particles in the exterior
spacetime of the charged rotating disc of dust are analyzed in dependence of
its specific charge and a relativity parameter. The charged rotating disc of
dust is an axisymmetric, stationary solution of the Einstein-Maxwell equations
in term... | [
{
"created": "Fri, 3 May 2024 10:54:58 GMT",
"version": "v1"
}
] | 2024-05-06 | [
[
"Rumler",
"David",
""
]
] | Equatorial circular geodesic orbits of neutral test particles in the exterior spacetime of the charged rotating disc of dust are analyzed in dependence of its specific charge and a relativity parameter. The charged rotating disc of dust is an axisymmetric, stationary solution of the Einstein-Maxwell equations in terms ... |
2303.07282 | Jonathan Gorard | Jonathan Gorard | Non-Vacuum Solutions, Gravitational Collapse and Discrete Singularity
Theorems in Wolfram Model Systems | 109 pages, 62 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The celebrated geodesic congruence equation of Raychaudhuri, together with
the resulting singularity theorems of Penrose and Hawking that it enabled,
yield a highly general set of conditions under which a spacetime (or, more
generically, a pseudo-Riemannian manifold) is expected to become geodesically
incomplete. It ... | [
{
"created": "Fri, 10 Mar 2023 00:46:13 GMT",
"version": "v1"
}
] | 2023-03-14 | [
[
"Gorard",
"Jonathan",
""
]
] | The celebrated geodesic congruence equation of Raychaudhuri, together with the resulting singularity theorems of Penrose and Hawking that it enabled, yield a highly general set of conditions under which a spacetime (or, more generically, a pseudo-Riemannian manifold) is expected to become geodesically incomplete. It is... |
0905.2031 | Lorenzo Fatibene | L.Fatibene, M.Francaviglia | Global Barbero-Immirzi Connections | 9 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Barbero-Immirzi (BI) connection, as usually introduced out of a spin
connection, is a global object though it does not transform properly as a
genuine connection with respect to generic spin transformations, unless quite
specific and suitable gauges are imposed. We shall here investigate whether and
under which g... | [
{
"created": "Wed, 13 May 2009 07:46:02 GMT",
"version": "v1"
}
] | 2009-05-14 | [
[
"Fatibene",
"L.",
""
],
[
"Francaviglia",
"M.",
""
]
] | The Barbero-Immirzi (BI) connection, as usually introduced out of a spin connection, is a global object though it does not transform properly as a genuine connection with respect to generic spin transformations, unless quite specific and suitable gauges are imposed. We shall here investigate whether and under which glo... |
1904.09297 | Francesco Torsello | Francesco Torsello | The mean gauges in bimetric relativity | 16 pages plus appendices. It matches with the published version. The
ancillary files include the colored version of the paper | Classical and Quantum Gravity 36.23 (Nov. 2019), p. 235010 | 10.1088/1361-6382/ab4ccf | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The choice of gauge in numerical relativity is crucial in avoiding coordinate
and curvature singularities. In addition, the gauge can affect the
well-posedness of the system. In this work, we consider the mean gauges,
established with respect to the geometric mean metric $h = g \,
(g^{-1}f)^{1/2}$ in bimetric relativ... | [
{
"created": "Fri, 19 Apr 2019 18:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jan 2020 12:49:11 GMT",
"version": "v2"
}
] | 2020-01-16 | [
[
"Torsello",
"Francesco",
""
]
] | The choice of gauge in numerical relativity is crucial in avoiding coordinate and curvature singularities. In addition, the gauge can affect the well-posedness of the system. In this work, we consider the mean gauges, established with respect to the geometric mean metric $h = g \, (g^{-1}f)^{1/2}$ in bimetric relativit... |
2309.02560 | Alexander Zhidenko | R. A. Konoplya and A. Zhidenko | Analytic expressions for quasinormal modes and grey-body factors in the
eikonal limit and beyond | 18 pages, 1 figure | Class. Quantum Grav. 40: 245005 (2023) | 10.1088/1361-6382/ad0a52 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although the WKB series converges only asymptotically and guarantees the
exact result solely in the eikonal regime, we have managed to derive concise
analytical expressions for the quasinormal modes and grey-body factors of black
holes, expanding beyond the eikonal approximation. Remarkably, these
expressions demonst... | [
{
"created": "Tue, 5 Sep 2023 20:07:39 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Nov 2023 05:28:00 GMT",
"version": "v2"
}
] | 2023-11-22 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | Although the WKB series converges only asymptotically and guarantees the exact result solely in the eikonal regime, we have managed to derive concise analytical expressions for the quasinormal modes and grey-body factors of black holes, expanding beyond the eikonal approximation. Remarkably, these expressions demonstra... |
0707.4323 | Peter Phillips | Peter R. Phillips | Is the Mass Scale for Elementary Particles Classically Determined? | 17 pages, 9 figures, format for Phys. Rev. D | null | null | null | gr-qc | null | We investigate whether a mass scale for elementary particles can be derived
from interactions of particles with distant matter in the Universe, the
mechanism of the interaction being the classical vector potential, propagating
in a space of negative curvature. A possible context for such a mass scale is
conformal gra... | [
{
"created": "Sun, 29 Jul 2007 23:27:24 GMT",
"version": "v1"
}
] | 2007-07-31 | [
[
"Phillips",
"Peter R.",
""
]
] | We investigate whether a mass scale for elementary particles can be derived from interactions of particles with distant matter in the Universe, the mechanism of the interaction being the classical vector potential, propagating in a space of negative curvature. A possible context for such a mass scale is conformal gravi... |
1409.4162 | Wei-Tou Ni | Gang Wang and Wei-Tou Ni | Orbit optimization and time delay interferometry for inclined ASTROD-GW
formation with half-year precession-period | 25 pages, 7 figures and 5 tables. arXiv admin note: text overlap with
arXiv:1205.5175 | Chin. Phys. B 24 059501 (2015) | 10.1088/1674-1056/24/5/059501 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | ASTROD-GW (ASTROD [Astrodynamical Space Test of Relativity using Optical
Devices] optimized for Gravitational Wave detection) is a gravitational-wave
mission with the aim of detecting gravitational waves from massive black holes,
extreme mass ratio inspirals (EMRIs) and galactic compact binaries, together
with testin... | [
{
"created": "Mon, 15 Sep 2014 06:49:23 GMT",
"version": "v1"
}
] | 2015-09-18 | [
[
"Wang",
"Gang",
""
],
[
"Ni",
"Wei-Tou",
""
]
] | ASTROD-GW (ASTROD [Astrodynamical Space Test of Relativity using Optical Devices] optimized for Gravitational Wave detection) is a gravitational-wave mission with the aim of detecting gravitational waves from massive black holes, extreme mass ratio inspirals (EMRIs) and galactic compact binaries, together with testing ... |
0904.0453 | Alejandro Jenkins | Alejandro Jenkins | Constraints on emergent gravity | 8 pages, 1 figure, preprint format. Submitted to the Gravity Research
Foundation 2009 Awards for Essays on Gravitation. Awarded honorable mention,
to appear in special issue of IJMPD. v2: references improved, minor points
clarified | Int.J.Mod.Phys.D18:2249-2255,2009 | 10.1142/S0218271809015941 | MIT-CTP-4025 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this essay we review the central difficulty in formulating a viable
quantum field theory in which gravity is emergent at low energies, rather than
mediated by a fundamental gauge field. The Weinberg-Witten theorem forbids spin
2 massless modes from carrying Lorentz covariant stress-energy. In General
Relativity th... | [
{
"created": "Fri, 3 Apr 2009 17:21:03 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 2009 18:08:10 GMT",
"version": "v2"
}
] | 2010-06-01 | [
[
"Jenkins",
"Alejandro",
""
]
] | In this essay we review the central difficulty in formulating a viable quantum field theory in which gravity is emergent at low energies, rather than mediated by a fundamental gauge field. The Weinberg-Witten theorem forbids spin 2 massless modes from carrying Lorentz covariant stress-energy. In General Relativity the ... |
0803.0351 | Yosef Zlochower | Sergio Dain, Carlos O. Lousto, Yosef Zlochower | Extra-Large Remnant Recoil Velocities and Spins from
Near-Extremal-Bowen-York-Spin Black-Hole Binaries | 11 pages, 10 figures. To appear in PRD | Phys.Rev.D78:024039,2008 | 10.1103/PhysRevD.78.024039 | Phys. Rev. D 78, 024039 (2008) | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evolve equal-mass, equal-spin black-hole binaries with specific spins of
a/mH 0.925, the highest spins simulated thus far and nearly the largest
possible for Bowen-York black holes, in a set of configurations with the spins
counter-aligned and pointing in the orbital plane, which maximizes the recoil
velocities of... | [
{
"created": "Tue, 4 Mar 2008 15:20:42 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 2008 22:36:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dain",
"Sergio",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Zlochower",
"Yosef",
""
]
] | We evolve equal-mass, equal-spin black-hole binaries with specific spins of a/mH 0.925, the highest spins simulated thus far and nearly the largest possible for Bowen-York black holes, in a set of configurations with the spins counter-aligned and pointing in the orbital plane, which maximizes the recoil velocities of t... |
0706.1298 | Suresh Tiwari dr | S. C. Tiwari | On the harmonic map equation | 2 pages, no figures | null | null | null | gr-qc | null | A generalized harmonic map equation is presented based on the proposed action
functional in the Weyl space (PLA, 135, 315, 1989).
| [
{
"created": "Sat, 9 Jun 2007 10:08:08 GMT",
"version": "v1"
}
] | 2007-06-12 | [
[
"Tiwari",
"S. C.",
""
]
] | A generalized harmonic map equation is presented based on the proposed action functional in the Weyl space (PLA, 135, 315, 1989). |
2101.10499 | Jose Wadih Maluf Dr. | F. L. Carneiro, S. C. Ulhoa, J. W. Maluf and J. F. da Rocha-Neto | Non-linear Plane Gravitational Waves as Space-time Defects | 18 pages, 5 figures, published in the Eur. Phys. J. C | Eur. Phys. J. C (2021)81:67 | 10.1140/epjc/s10052-021-08862-x | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider non-linear plane gravitational waves as propagating space-time
defects, and construct the Burgers vector of the waves. In the context of
classical continuum systems, the Burgers vector is a measure of the deformation
of the medium, and at a microscopic (atomic) scale, it is a naturally quantized
object. O... | [
{
"created": "Tue, 26 Jan 2021 00:47:56 GMT",
"version": "v1"
}
] | 2021-01-27 | [
[
"Carneiro",
"F. L.",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"Maluf",
"J. W.",
""
],
[
"da Rocha-Neto",
"J. F.",
""
]
] | We consider non-linear plane gravitational waves as propagating space-time defects, and construct the Burgers vector of the waves. In the context of classical continuum systems, the Burgers vector is a measure of the deformation of the medium, and at a microscopic (atomic) scale, it is a naturally quantized object. One... |
gr-qc/0310133 | Saibal Ray | Saibal Ray (1 and 2), Sumana Bhadra (2), Anand S. Sengupta (1) ((1)
Inter-University Centre for Astronomy and Astrophysics, Pune, India. (2)
Department of Physics, Barasat Government College, Barasat, West Bengal,
India.) | Relativistic anisotropic charged fluid spheres with varying cosmological
constant | 15 pages, 3 eps figures | Astrophys.SpaceSci.315:341-346,2008 | 10.1007/s10509-008-9843-2 | IUCAA 43/03 | gr-qc | null | Static spherically symmetric anisotropic source has been studied for the
Einstein-Maxwell field equations assuming the erstwhile cosmological constant $
\Lambda $ to be a space-variable scalar, viz., $ \Lambda = \Lambda(r) $. Two
cases have been examined out of which one reduces to isotropic sphere. The
solutions thu... | [
{
"created": "Fri, 31 Oct 2003 07:14:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ray",
"Saibal",
"",
"1 and 2"
],
[
"Bhadra",
"Sumana",
""
],
[
"Sengupta",
"Anand S.",
""
]
] | Static spherically symmetric anisotropic source has been studied for the Einstein-Maxwell field equations assuming the erstwhile cosmological constant $ \Lambda $ to be a space-variable scalar, viz., $ \Lambda = \Lambda(r) $. Two cases have been examined out of which one reduces to isotropic sphere. The solutions thus ... |
1604.06207 | Mahamat Saleh | Mahamat Saleh, Bouetou Bouetou Thomas and Kofane Timoleon Crepin | Thermodynamics and Phase transition of the Reissner-Nordstr\"om Black
Hole surrounded by quintessence | 9 pages, 8 figures | Gen Relativ Gravit (2012) 44:2181-2189 | 10.1007/s10714-012-1382-z | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate thermodynamics and Phase transition of the
Reissner-Nordstr\"om black hole surrounded by quintessence. Using
thermodynamical laws of black holes, we derive the expressions of some
thermodynamics quantities for the Reissner-Nordstr\"om black hole surrounded by
quintessence. The variations of the tempera... | [
{
"created": "Thu, 21 Apr 2016 07:58:01 GMT",
"version": "v1"
}
] | 2016-04-22 | [
[
"Saleh",
"Mahamat",
""
],
[
"Thomas",
"Bouetou Bouetou",
""
],
[
"Crepin",
"Kofane Timoleon",
""
]
] | We investigate thermodynamics and Phase transition of the Reissner-Nordstr\"om black hole surrounded by quintessence. Using thermodynamical laws of black holes, we derive the expressions of some thermodynamics quantities for the Reissner-Nordstr\"om black hole surrounded by quintessence. The variations of the temperatu... |
gr-qc/0102027 | Oscar Alejandro Reula | Mirta S. Iriondo, and Oscar A. Reula | On free evolution of self gravitating, spherically symmetric waves | 15 pages, 15 figures | Phys.Rev. D65 (2002) 044024 | 10.1103/PhysRevD.65.044024 | null | gr-qc | null | We perform a numerical free evolution of a selfgravitating, spherically
symmetric scalar field satisfying the wave equation. The evolution equations
can be written in a very simple form and are symmetric hyperbolic in
Eddington-Finkelstein coordinates. The simplicity of the system allow to
display and deal with the t... | [
{
"created": "Wed, 7 Feb 2001 16:19:31 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Iriondo",
"Mirta S.",
""
],
[
"Reula",
"Oscar A.",
""
]
] | We perform a numerical free evolution of a selfgravitating, spherically symmetric scalar field satisfying the wave equation. The evolution equations can be written in a very simple form and are symmetric hyperbolic in Eddington-Finkelstein coordinates. The simplicity of the system allow to display and deal with the typ... |
1810.04627 | Ronald Gamble Jr | Ronald Gamble, Jr and K. M. Flurchick | Scalar-Tensor Gravitational Strain Field Equations and the Longitudinal
Wave Form | 9 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From modern observations of gravitational interactions, it can be inferred
that there is much left to discover about the fundamental gravitational field.
Since the advent of the General Theory of Relativity over a century ago, we
have come to make exotic assumptions pertaining to the inner workings of an
associated f... | [
{
"created": "Wed, 10 Oct 2018 16:36:05 GMT",
"version": "v1"
}
] | 2018-10-11 | [
[
"Gamble,",
"Ronald",
"Jr"
],
[
"Flurchick",
"K. M.",
""
]
] | From modern observations of gravitational interactions, it can be inferred that there is much left to discover about the fundamental gravitational field. Since the advent of the General Theory of Relativity over a century ago, we have come to make exotic assumptions pertaining to the inner workings of an associated fie... |
1701.00744 | Nicola Tamanini | Jibitesh Dutta, Wompherdeiki Khyllep and Nicola Tamanini | Scalar-Fluid interacting dark energy: cosmological dynamics beyond the
exponential potential | 20 pages, 9 figures, 3 tables; accepted by Phys. Rev. D | null | 10.1103/PhysRevD.95.023515 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the dynamical systems analysis of Scalar-Fluid interacting dark
energy models performed in C. G. Boehmer et al, Phys. Rev. D 91, 123002 (2015),
by considering scalar field potentials beyond the exponential type. The
properties and stability of critical points are examined using a combination of
linear analy... | [
{
"created": "Tue, 3 Jan 2017 16:49:49 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Tamanini",
"Nicola",
""
]
] | We extend the dynamical systems analysis of Scalar-Fluid interacting dark energy models performed in C. G. Boehmer et al, Phys. Rev. D 91, 123002 (2015), by considering scalar field potentials beyond the exponential type. The properties and stability of critical points are examined using a combination of linear analysi... |
2306.11366 | Michael Coughlin | Muhammed Saleem, Alec Gunny, Chia-Jui Chou, Li-Cheng Yang, Shu-Wei
Yeh, Andy H. Y. Chen, Ryan Magee, William Benoit, Tri Nguyen, Pinchen Fan,
Deep Chatterjee, Ethan Marx, Eric Moreno, Rafia Omer, Ryan Raikman, Dylan
Rankin, Ritwik Sharma, Michael Coughlin, Philip Harris, Erik Katsavounidis | Demonstration of Machine Learning-assisted real-time noise regression in
gravitational wave detectors | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Real-time noise regression algorithms are crucial for maximizing the science
outcomes of the LIGO, Virgo, and KAGRA gravitational-wave detectors. This
includes improvements in the detectability, source localization and pre-merger
detectability of signals thereby enabling rapid multi-messenger follow-up. In
this paper... | [
{
"created": "Tue, 20 Jun 2023 08:14:33 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Saleem",
"Muhammed",
""
],
[
"Gunny",
"Alec",
""
],
[
"Chou",
"Chia-Jui",
""
],
[
"Yang",
"Li-Cheng",
""
],
[
"Yeh",
"Shu-Wei",
""
],
[
"Chen",
"Andy H. Y.",
""
],
[
"Magee",
"Ryan",
""
],
[
"Benoi... | Real-time noise regression algorithms are crucial for maximizing the science outcomes of the LIGO, Virgo, and KAGRA gravitational-wave detectors. This includes improvements in the detectability, source localization and pre-merger detectability of signals thereby enabling rapid multi-messenger follow-up. In this paper, ... |
gr-qc/9907089 | Charles Torre | C. G. Torre (Utah State University) | Gravitational Waves: Just Plane Symmetry | 10 pages, TeX, uses IOP style files | Gen.Rel.Grav. 38 (2006) 653-662 | 10.1007/s10714-006-0255-8 | null | gr-qc | null | We present some remarkable properties of the symmetry group for gravitational
plane waves. Our main observation is that metrics with plane wave symmetry
satisfy every system of generally covariant vacuum field equations except the
Einstein equations. The proof uses the homothety admitted by metrics with plane
wave sy... | [
{
"created": "Tue, 27 Jul 1999 17:42:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Torre",
"C. G.",
"",
"Utah State University"
]
] | We present some remarkable properties of the symmetry group for gravitational plane waves. Our main observation is that metrics with plane wave symmetry satisfy every system of generally covariant vacuum field equations except the Einstein equations. The proof uses the homothety admitted by metrics with plane wave symm... |
1909.07104 | Wen-Hong Ruan | Wen-Hong Ruan, Chang Liu, Zong-Kuan Guo, Yue-Liang Wu, Rong-Gen Cai | The LISA-Taiji network: precision localization of massive black hole
binaries | 12 pages, 6 figures | Research, vol. 2021, Article ID 6014164, 7 pages, 2021 | 10.34133/2021/6014164 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A space-based gravitational-wave detector, LISA, consists of a triangle of
three spacecrafts with a separation distance of 2.5 million kilometers in a
heliocentric orbit behind the Earth. Like LISA, Taiji is compose of a triangle
of three spacecrafts with a separation distance of 3 million kilometers in a
heliocentri... | [
{
"created": "Mon, 16 Sep 2019 10:24:03 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2019 14:10:15 GMT",
"version": "v2"
}
] | 2021-01-12 | [
[
"Ruan",
"Wen-Hong",
""
],
[
"Liu",
"Chang",
""
],
[
"Guo",
"Zong-Kuan",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Cai",
"Rong-Gen",
""
]
] | A space-based gravitational-wave detector, LISA, consists of a triangle of three spacecrafts with a separation distance of 2.5 million kilometers in a heliocentric orbit behind the Earth. Like LISA, Taiji is compose of a triangle of three spacecrafts with a separation distance of 3 million kilometers in a heliocentric ... |
2303.05612 | Christyan C. de Oliveira | Christyan C. de Oliveira, Ricardo A. Mosna, Jo\~ao Paulo M. Pitelli | Robin boundary conditions in acoustic BTZ black holes | 12 pages, 6 figures | Phys. Rev. D 107, 064018 (2023) | 10.1103/PhysRevD.107.064018 | null | gr-qc math-ph math.MP physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an analog model for the conformally coupled scalar field on the
BTZ black hole. The model is based on the propagation of acoustic waves in a
Laval nozzle. Since the BTZ black hole is not a globally hyperbolic spacetime,
the dynamics of the scalar field is not well defined until extra boundary
conditions ... | [
{
"created": "Thu, 9 Mar 2023 23:00:06 GMT",
"version": "v1"
}
] | 2023-03-13 | [
[
"de Oliveira",
"Christyan C.",
""
],
[
"Mosna",
"Ricardo A.",
""
],
[
"Pitelli",
"João Paulo M.",
""
]
] | We introduce an analog model for the conformally coupled scalar field on the BTZ black hole. The model is based on the propagation of acoustic waves in a Laval nozzle. Since the BTZ black hole is not a globally hyperbolic spacetime, the dynamics of the scalar field is not well defined until extra boundary conditions ar... |
2006.00793 | Vladimir S. Manko | H. Garc\'ia-Compe\'an, V.S. Manko, E. Ruiz | Comments on two papers of Cl\'ement and Gal'tsov | 4 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We comment on physical inconsistences of the Cl\'ement-Gal'tsov approach to
Smarr's mass formula in the presence of magnetic charge. We also point out that
the results of Cl\'ement and Gal'tsov involving the NUT parameter are
essentially based on the known study (dating back to 2006) of the
Demia\'nski-Newman solutio... | [
{
"created": "Mon, 1 Jun 2020 08:36:04 GMT",
"version": "v1"
}
] | 2020-06-02 | [
[
"García-Compeán",
"H.",
""
],
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | We comment on physical inconsistences of the Cl\'ement-Gal'tsov approach to Smarr's mass formula in the presence of magnetic charge. We also point out that the results of Cl\'ement and Gal'tsov involving the NUT parameter are essentially based on the known study (dating back to 2006) of the Demia\'nski-Newman solutions... |
1606.06297 | Maarten van de Meent | Maarten van de Meent | Gravitational self-force on eccentric equatorial orbits around a Kerr
black hole | Various typos and correction to match version accepted for
publication in PRD | Phys. Rev. D 94, 044034 (2016) | 10.1103/PhysRevD.94.044034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents the first calculation of the gravitational self-force on
a small compact object on an eccentric equatorial orbit around a Kerr black
hole to first order in the mass-ratio. That is the pointwise correction to the
object's equations of motion (both conservative and dissipative) due to its own
gravit... | [
{
"created": "Mon, 20 Jun 2016 20:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Aug 2016 09:56:30 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"van de Meent",
"Maarten",
""
]
] | This paper presents the first calculation of the gravitational self-force on a small compact object on an eccentric equatorial orbit around a Kerr black hole to first order in the mass-ratio. That is the pointwise correction to the object's equations of motion (both conservative and dissipative) due to its own gravitat... |
1503.03059 | Saugata Mitra | Saugata Mitra, Subhajit Saha and Subenoy Chakraborty | Universal thermodynamics in different gravity theories: Modified entropy
on the horizons | null | Physics Letters B 734, 173 (2014) | 10.1016/j.physletb.2014.05.044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with universal thermodynamics for FRW model of the universe
bounded by apparent (or event) horizon. Assuming Hawking temperature on the
horizon, the unified first law is examined on the horizon for different gravity
theories. The results show that equilibrium configuration is preserved with a
modifica... | [
{
"created": "Tue, 10 Mar 2015 05:30:23 GMT",
"version": "v1"
}
] | 2016-05-17 | [
[
"Mitra",
"Saugata",
""
],
[
"Saha",
"Subhajit",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The paper deals with universal thermodynamics for FRW model of the universe bounded by apparent (or event) horizon. Assuming Hawking temperature on the horizon, the unified first law is examined on the horizon for different gravity theories. The results show that equilibrium configuration is preserved with a modificati... |
1808.01653 | Thiago R.P. Caram\^es | E. A. F. Bragan\c{c}a, Thiago R. P. Caram\^es, J\'ulio C. Fabris and
Ant\^onio de P\'adua Santos | Some effects of non-conservative gravity on cosmic string configurations | 12 pages, 8 figures. Improved version with more discussion added to
the sections II, III.A and V.C. Matches version accepted in EPJC | Eur. Phys. J. C (2019) 79: 162 | 10.1140/epjc/s10052-019-6672-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate some consequences of a specific non-conservation of the
energy-momentum tensor on the physics of certain cosmic string configurations.
This non-conservation is induced by a new gravitational theory recently
introduced as an attempt to incorporate dissipative systems in the gravity
description. This mod... | [
{
"created": "Sun, 5 Aug 2018 17:13:01 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Feb 2019 16:38:36 GMT",
"version": "v2"
}
] | 2019-02-26 | [
[
"Bragança",
"E. A. F.",
""
],
[
"Caramês",
"Thiago R. P.",
""
],
[
"Fabris",
"Júlio C.",
""
],
[
"Santos",
"Antônio de Pádua",
""
]
] | We investigate some consequences of a specific non-conservation of the energy-momentum tensor on the physics of certain cosmic string configurations. This non-conservation is induced by a new gravitational theory recently introduced as an attempt to incorporate dissipative systems in the gravity description. This model... |
gr-qc/0311015 | Yongge Ma | Yongge Ma and Jun Wu | 5-Dimensional Kaluza-Klein Theory with a Source | 8 pages, three references added | Int.J.Mod.Phys. A19 (2004) 5043 | 10.1142/S0217751X04019640 | null | gr-qc hep-th | null | A free test particle in 5-dimensional Kaluza-Klein spacetime will show its
electricity in the reduced 4-dimensional spacetime when it moves along the
fifth dimension. In the light of this observation, we study the coupling of a
5-dimensional dust field with the Kaluza-Klein gravity. It turns out that the
dust field c... | [
{
"created": "Wed, 5 Nov 2003 15:13:10 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Feb 2004 14:42:12 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Dec 2004 06:47:38 GMT",
"version": "v3"
},
{
"created": "Sun, 20 Feb 2005 05:30:36 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Ma",
"Yongge",
""
],
[
"Wu",
"Jun",
""
]
] | A free test particle in 5-dimensional Kaluza-Klein spacetime will show its electricity in the reduced 4-dimensional spacetime when it moves along the fifth dimension. In the light of this observation, we study the coupling of a 5-dimensional dust field with the Kaluza-Klein gravity. It turns out that the dust field can... |
gr-qc/9709078 | Enzo Leguizamon | Mirta S. Iriondo, Enzo O. Leguizam\'on and Oscar A. Reula | Fast and Slow solutions in General Relativity: The Initialization
Procedure | 14 pages, LateX | J.Math.Phys. 39 (1998) 1555-1565 | 10.1063/1.532396 | null | gr-qc | null | We apply recent results in the theory of PDE, specifically in problems with
two different time scales, on Einstein's equations near their Newtonian limit.
The results imply a justification to Postnewtonian approximations when
initialization procedures to different orders are made on the initial data. We
determine up ... | [
{
"created": "Mon, 29 Sep 1997 21:15:28 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Iriondo",
"Mirta S.",
""
],
[
"Leguizamón",
"Enzo O.",
""
],
[
"Reula",
"Oscar A.",
""
]
] | We apply recent results in the theory of PDE, specifically in problems with two different time scales, on Einstein's equations near their Newtonian limit. The results imply a justification to Postnewtonian approximations when initialization procedures to different orders are made on the initial data. We determine up to... |
gr-qc/0306042 | Volker Perlick | Thomas Foertsch, Wolfgang Hasse, Volker Perlick | Inertial forces and photon surfaces in arbitrary spacetimes | 20 pages, 2 eps-figures; submitted to Class. Quantum Grav | Class.Quant.Grav. 20 (2003) 4635-4652 | 10.1088/0264-9381/20/21/006 | null | gr-qc | null | Given, in an arbitrary spacetime, a 2-dimensional timelike submanifold
(worldsheet) and an observer field on this worldsheet, we assign gravitational,
centrifugal, Coriolis and Euler forces to every particle worldline in the
worldsheet with respect to the observer field. We prove that centrifugal and
Coriolis forces ... | [
{
"created": "Tue, 10 Jun 2003 13:59:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Foertsch",
"Thomas",
""
],
[
"Hasse",
"Wolfgang",
""
],
[
"Perlick",
"Volker",
""
]
] | Given, in an arbitrary spacetime, a 2-dimensional timelike submanifold (worldsheet) and an observer field on this worldsheet, we assign gravitational, centrifugal, Coriolis and Euler forces to every particle worldline in the worldsheet with respect to the observer field. We prove that centrifugal and Coriolis forces va... |
1009.2726 | David Garfinkle | David Garfinkle | Matters of Gravity, The Newsletter of the Topical Group on Gravitation
of the American Physical Society, Volume 36, Fall 2010 | 18 pages, 3 figures, latex | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GGR News: -we hear that..., by David Garfinkle -Network of gravitational-wave
detectors, by Stan Whitcomb Research Briefs: -New tests of general relativity,
by Quentin Bailey Conference Reports: -Theory meets data analysis, by Steve
Detweiler -Ascona conference, by Simon Ross -Condensed Matter at
AdS/CFT/Strings 2010... | [
{
"created": "Tue, 14 Sep 2010 18:00:57 GMT",
"version": "v1"
}
] | 2010-09-15 | [
[
"Garfinkle",
"David",
""
]
] | GGR News: -we hear that..., by David Garfinkle -Network of gravitational-wave detectors, by Stan Whitcomb Research Briefs: -New tests of general relativity, by Quentin Bailey Conference Reports: -Theory meets data analysis, by Steve Detweiler -Ascona conference, by Simon Ross -Condensed Matter at AdS/CFT/Strings 2010, ... |
2206.12642 | Andronikos Paliathanasis | Andronikos Paliathanasis | Painlev\'e analysis for the cosmological field equations in Weyl
Integrable Spacetime | 14 pages, no figures, | Universe 8, 345 (2022) | 10.3390/universe8070345 | null | gr-qc astro-ph.CO math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We apply singularity analysis to investigate the integrability properties of
the gravitational field equations in Weyl Integrable Spacetime for a spatially
flat Friedmann--Lema\^itre--Robertson--Walker background spacetime induced with
an ideal gas. We find that the field equations possess the Painlev\'e property
in ... | [
{
"created": "Sat, 25 Jun 2022 12:57:52 GMT",
"version": "v1"
}
] | 2022-06-28 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We apply singularity analysis to investigate the integrability properties of the gravitational field equations in Weyl Integrable Spacetime for a spatially flat Friedmann--Lema\^itre--Robertson--Walker background spacetime induced with an ideal gas. We find that the field equations possess the Painlev\'e property in th... |
2309.03293 | Hongwei Tan | Muxin Han, Zichang Huang, Hongwei Tan | Symmetry charges on reduced phase space and BMS algebra | 33+8 pages, no figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the reduced phase space formulation (relational formalism)
of gravity coupling to the Brown-Kucha\v r dust for asymptotic flat spacetimes.
A set of boundary conditions for the asymptotic flatness are formulated for
Dirac observables on the reduced phase space. The physical Hamiltonian
generates the... | [
{
"created": "Wed, 6 Sep 2023 18:13:26 GMT",
"version": "v1"
}
] | 2023-09-08 | [
[
"Han",
"Muxin",
""
],
[
"Huang",
"Zichang",
""
],
[
"Tan",
"Hongwei",
""
]
] | This paper studies the reduced phase space formulation (relational formalism) of gravity coupling to the Brown-Kucha\v r dust for asymptotic flat spacetimes. A set of boundary conditions for the asymptotic flatness are formulated for Dirac observables on the reduced phase space. The physical Hamiltonian generates the t... |
1708.08315 | Sumanta Chakraborty | Sumanta Chakraborty and Soumitra SenGupta | Packing extra mass in compact stellar structures: An interplay between
Kalb-Ramond field and extra dimensions | Revised; 25 pages; 3 figures; Published in JCAP | JCAP 05(2018)032 | 10.1088/1475-7516/2018/05/032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have derived the Buchdahl's limit for a relativistic star in presence of
the Kalb-Ramond field in four as well as in higher dimensions. It turns out
that the Buchdahl's limit gets severely affected by the inclusion of the
Kalb-Ramond field. In particular, the Kalb-Ramond field in four spacetime
dimensions enables ... | [
{
"created": "Fri, 25 Aug 2017 00:23:55 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2018 01:04:10 GMT",
"version": "v2"
}
] | 2018-05-14 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | We have derived the Buchdahl's limit for a relativistic star in presence of the Kalb-Ramond field in four as well as in higher dimensions. It turns out that the Buchdahl's limit gets severely affected by the inclusion of the Kalb-Ramond field. In particular, the Kalb-Ramond field in four spacetime dimensions enables on... |
1506.02287 | Scott Robertson | Scott Robertson and Renaud Parentani | Hawking radiation in the presence of high-momentum dissipation | 27 pages, 12 figures | Phys. Rev. D 92, 044043 (2015) | 10.1103/PhysRevD.92.044043 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Hawking radiation in field theories which break Lorentz
invariance via dissipative effects above a certain energy scale. We assume that
the additional degrees of freedom which cause dissipation are Gaussian and
freely falling. The asymptotic spectrum and the correlations are extracted from
the anticommut... | [
{
"created": "Sun, 7 Jun 2015 16:46:54 GMT",
"version": "v1"
}
] | 2015-09-02 | [
[
"Robertson",
"Scott",
""
],
[
"Parentani",
"Renaud",
""
]
] | We study the Hawking radiation in field theories which break Lorentz invariance via dissipative effects above a certain energy scale. We assume that the additional degrees of freedom which cause dissipation are Gaussian and freely falling. The asymptotic spectrum and the correlations are extracted from the anticommutat... |
1607.03523 | Elias Okon | Gabriel Le\'on, Abhishek Majhi, Elias Okon and Daniel Sudarsky | Reassessing the link between B-modes and inflation | Accepted for publication in PRD | Phys. Rev. D 96, 101301 (2017) | 10.1103/PhysRevD.96.101301 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reevaluate the predictions of inflation regarding primordial gravity
waves, which should appear as B-modes in the CMB, in light of the fact that the
standard inflationary paradigm is unable to account for the transition from an
initially symmetric state into a non-symmetric outcome. We show that the
incorporation ... | [
{
"created": "Tue, 12 Jul 2016 21:31:15 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2016 17:17:40 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Apr 2017 15:56:23 GMT",
"version": "v3"
},
{
"created": "Wed, 1 Nov 2017 20:19:36 GMT",
"version": "v4"
}
] | 2017-11-22 | [
[
"León",
"Gabriel",
""
],
[
"Majhi",
"Abhishek",
""
],
[
"Okon",
"Elias",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | We reevaluate the predictions of inflation regarding primordial gravity waves, which should appear as B-modes in the CMB, in light of the fact that the standard inflationary paradigm is unable to account for the transition from an initially symmetric state into a non-symmetric outcome. We show that the incorporation of... |
1703.06355 | Ra\'ul Carballo-Rubio | Carlos Barcel\'o, Ra\'ul Carballo-Rubio and Luis J. Garay | Weyl relativity: A novel approach to Weyl's ideas | 34 pages, no figures | JCAP 1706 (2017) no.06, 014 | 10.1088/1475-7516/2017/06/014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we revisit the motivation and construction of a unified theory
of gravity and electromagnetism, following Weyl's insights regarding the
appealing potential connection between the gauge invariance of electromagnetism
and the conformal invariance of the gravitational field. We highlight that
changing the ... | [
{
"created": "Sat, 18 Mar 2017 21:39:48 GMT",
"version": "v1"
}
] | 2018-02-13 | [
[
"Barceló",
"Carlos",
""
],
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Garay",
"Luis J.",
""
]
] | In this paper we revisit the motivation and construction of a unified theory of gravity and electromagnetism, following Weyl's insights regarding the appealing potential connection between the gauge invariance of electromagnetism and the conformal invariance of the gravitational field. We highlight that changing the lo... |
gr-qc/0202011 | Alejandra Melfo | Rommel Guerrero, Alejandra Melfo and Nelson Pantoja | Self-gravitating domain walls and the thin-wall limit | 10 pages, revtex | Phys.Rev. D65 (2002) 125010 | 10.1103/PhysRevD.65.125010 | null | gr-qc | null | We analyse the distributional thin wall limit of self gravitating scalar
field configurations representing thick domain wall geometries. We show that
thick wall solutions can be generated by appropiate scaling of the thin wall
ones, and obtain an exact solution for a domain wall that interpolates between
AdS_4 asympt... | [
{
"created": "Tue, 5 Feb 2002 19:00:02 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Guerrero",
"Rommel",
""
],
[
"Melfo",
"Alejandra",
""
],
[
"Pantoja",
"Nelson",
""
]
] | We analyse the distributional thin wall limit of self gravitating scalar field configurations representing thick domain wall geometries. We show that thick wall solutions can be generated by appropiate scaling of the thin wall ones, and obtain an exact solution for a domain wall that interpolates between AdS_4 asymptot... |
2309.07442 | Reggie Pantig | Ali \"Ovg\"un, Lemuel John F. Sese, Reggie C. Pantig | Constraints via the Event Horizon Telescope for Black Hole Solutions
with Dark Matter under the Generalized Uncertainty Principle Minimal Length
Scale Effect | 14 pages, 6 figures; 2 tables | Ann. Phys. (Berlin) 2023, 2300390 | 10.1002/andp.202300390 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Four spherically symmetric but non-asymptotically flat black hole solutions
surrounded with spherical dark matter distribution perceived under the minimal
length scale effect is derived via the generalized uncertainty principle. Here,
the effect of this quantum correction, described by the parameter $\gamma$, is
cons... | [
{
"created": "Thu, 14 Sep 2023 05:48:32 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2023 03:16:59 GMT",
"version": "v2"
}
] | 2023-12-08 | [
[
"Övgün",
"Ali",
""
],
[
"Sese",
"Lemuel John F.",
""
],
[
"Pantig",
"Reggie C.",
""
]
] | Four spherically symmetric but non-asymptotically flat black hole solutions surrounded with spherical dark matter distribution perceived under the minimal length scale effect is derived via the generalized uncertainty principle. Here, the effect of this quantum correction, described by the parameter $\gamma$, is consid... |
2103.05610 | Francisco Lobo | Miguel Alcubierre, Francisco S. N. Lobo | Warp drive basics | 17 pages, 5 figures. Contributed chapter to the book "Wormholes, Warp
Drives and Energy Conditions," Fundam. Theor. Phys. 189 (2017) (Part of the
Fundamental Theories of Physics book series, Springer Nature). arXiv admin
note: substantial text overlap with arXiv:0710.4474; text overlap with
arXiv:1008.1127, arX... | Fundam.Theor.Phys. 189 (2017) 257-279 | 10.1007/978-3-319-55182-1 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | "Warp drive" spacetimes and wormhole geometries are useful as
"gedanken-experiments" that force us to confront the foundations of general
relativity, and among other issues, to precisely formulate the notion of
"superluminal" travel and communication. Here we will consider the basic
definition and properties of warp ... | [
{
"created": "Tue, 9 Mar 2021 18:33:07 GMT",
"version": "v1"
}
] | 2021-03-11 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | "Warp drive" spacetimes and wormhole geometries are useful as "gedanken-experiments" that force us to confront the foundations of general relativity, and among other issues, to precisely formulate the notion of "superluminal" travel and communication. Here we will consider the basic definition and properties of warp dr... |
0705.3845 | David Brown | David Brown | BSSN in Spherical Symmetry | This is the final version to be published in CQG. It contains much
more information and detail than the original version | Class.Quant.Grav.25:205004,2008 | 10.1088/0264-9381/25/20/205004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The BSSN (Baumgarte-Shapiro-Shibata-Nakamura) formulation of the Einstein
evolution equations is written in spherical symmetry. These equations can be
used to address a number of technical and conceptual issues in numerical
relativity in the context of a single Schwarzschild black hole. One of the
benefits of spheric... | [
{
"created": "Fri, 25 May 2007 20:16:40 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2008 13:41:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Brown",
"David",
""
]
] | The BSSN (Baumgarte-Shapiro-Shibata-Nakamura) formulation of the Einstein evolution equations is written in spherical symmetry. These equations can be used to address a number of technical and conceptual issues in numerical relativity in the context of a single Schwarzschild black hole. One of the benefits of spherical... |
1801.00273 | Kourosh Nozari | M. Khodadi, K. Nozari, S. Dey, A. Bhat and Mir Faizal | A new bound on polymer quantization via an opto-mechanical setup | 7 pages, 1 figure, Accepted for Publication in Scientific Reports
(Nature) | Scientific Reports (2018) 8: 1659 | 10.1038/s41598-018-19181-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of a minimal measurable length as a characteristic length in
the Planck scale is one of the main features of quantum gravity and has been
widely explored in the context. Various different deformations of spacetime
have been employed successfully for the purpose. However, polymer quantization
approach is... | [
{
"created": "Sun, 31 Dec 2017 12:06:41 GMT",
"version": "v1"
}
] | 2018-01-30 | [
[
"Khodadi",
"M.",
""
],
[
"Nozari",
"K.",
""
],
[
"Dey",
"S.",
""
],
[
"Bhat",
"A.",
""
],
[
"Faizal",
"Mir",
""
]
] | The existence of a minimal measurable length as a characteristic length in the Planck scale is one of the main features of quantum gravity and has been widely explored in the context. Various different deformations of spacetime have been employed successfully for the purpose. However, polymer quantization approach is a... |
2007.07211 | Rita Teixeira da Costa | Yakov Shlapentokh-Rothman, Rita Teixeira da Costa | Boundedness and decay for the Teukolsky equation on Kerr in the full
subextremal range $|a|<M$: frequency space analysis | v2: 133 pages, 8 figures, minor changes for consistency with physical
space analysis | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is the first of a series regarding the Teukolsky equation of spin
$\pm 1$ and spin $\pm 2$ on Kerr backgrounds in the full subextremal range of
parameters $|a|<M$. In the present paper, we study fixed frequency solutions of
the transformed system of equations introduced by Dafermos, Holzegel and
Rodnianski... | [
{
"created": "Tue, 14 Jul 2020 17:29:11 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2023 18:32:20 GMT",
"version": "v2"
}
] | 2023-02-20 | [
[
"Shlapentokh-Rothman",
"Yakov",
""
],
[
"da Costa",
"Rita Teixeira",
""
]
] | This paper is the first of a series regarding the Teukolsky equation of spin $\pm 1$ and spin $\pm 2$ on Kerr backgrounds in the full subextremal range of parameters $|a|<M$. In the present paper, we study fixed frequency solutions of the transformed system of equations introduced by Dafermos, Holzegel and Rodnianski, ... |
1904.02557 | Timothy Clifton | Timothy Clifton, Roberto A. Sussman | Cosmological Backreaction in Spherical and Plane Symmetric Dust-Filled
Space-Times | 34 pages, 7 figures | Class. Quantum Grav. 36 (2019) 205004 | 10.1088/1361-6382/ab3a14 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the implementation of Buchert's and Green & Wald's averaging
formalisms in exact spherically symmetric and plane symmetric dust-filled
cosmological models. We find that, given a cosmological space-time, Buchert's
averaging scheme gives a faithful way of interpreting the large-scale expansion
of space, and ... | [
{
"created": "Thu, 4 Apr 2019 13:48:37 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2019 13:30:40 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Clifton",
"Timothy",
""
],
[
"Sussman",
"Roberto A.",
""
]
] | We examine the implementation of Buchert's and Green & Wald's averaging formalisms in exact spherically symmetric and plane symmetric dust-filled cosmological models. We find that, given a cosmological space-time, Buchert's averaging scheme gives a faithful way of interpreting the large-scale expansion of space, and ex... |
2109.00195 | Ayan Banerjee | Takol Tangphati, Anirudh Pradhan, Ayan Banerjee and Grigoris
Panotopoulos | Anisotropic Stars in 4D Einstein-Gauss-Bonnet Gravity | 13 pages, 5 figures, version accepted for publication in Phys. Dark
Univ | Physics of the Dark Universe 33 (2021) 100877 | 10.1016/j.dark.2021.100877 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current trend concerning dense matter physics at sufficiently high
densities and low temperatures is expected to behave as a degenerate Fermi gas
of quarks forming Cooper pairs, namely a color superconductor, in the core of
compact objects. In this context, we study the anisotropy of quark stars (QSs)
assuming th... | [
{
"created": "Wed, 1 Sep 2021 05:31:38 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Tangphati",
"Takol",
""
],
[
"Pradhan",
"Anirudh",
""
],
[
"Banerjee",
"Ayan",
""
],
[
"Panotopoulos",
"Grigoris",
""
]
] | The current trend concerning dense matter physics at sufficiently high densities and low temperatures is expected to behave as a degenerate Fermi gas of quarks forming Cooper pairs, namely a color superconductor, in the core of compact objects. In this context, we study the anisotropy of quark stars (QSs) assuming the ... |
1607.00042 | Wilson Rojas warojasc | W. A. Rojas C. and J. R. Arenas S | Thermodynamics of hot quantum scalar field in a (D+1) dimensional curved
spacetime | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the brick wall model to calculate the free energy of quantum scalar
field in a curved spacetime (D +1) dimensions. We find the thermodynamics
properties of quantum scalar field in several scenaries: Minkowski spacetime,
Schwarzschild spacetime and BTZ spacetime. For the cases analysed, the
thermodynamical prop... | [
{
"created": "Thu, 30 Jun 2016 20:50:37 GMT",
"version": "v1"
}
] | 2016-07-04 | [
[
"C.",
"W. A. Rojas",
""
],
[
"S",
"J. R. Arenas",
""
]
] | We use the brick wall model to calculate the free energy of quantum scalar field in a curved spacetime (D +1) dimensions. We find the thermodynamics properties of quantum scalar field in several scenaries: Minkowski spacetime, Schwarzschild spacetime and BTZ spacetime. For the cases analysed, the thermodynamical proper... |
1209.6428 | Neil J. Cornish | Neil J. Cornish | Applying Bayesian Inference to the first International Pulsar Timing
Array data challenge | 12 pages, 8 figures | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a very brief summary of the techniques I used to analyze the IPTA
challenge 1 data sets. I tried many things, and more failed than succeeded, but
in the end I found two approaches that appear to work based on tests done using
the open data sets. One approach works directly with the time domain data, and
the o... | [
{
"created": "Fri, 28 Sep 2012 06:03:40 GMT",
"version": "v1"
}
] | 2012-10-01 | [
[
"Cornish",
"Neil J.",
""
]
] | This is a very brief summary of the techniques I used to analyze the IPTA challenge 1 data sets. I tried many things, and more failed than succeeded, but in the end I found two approaches that appear to work based on tests done using the open data sets. One approach works directly with the time domain data, and the oth... |
gr-qc/0504139 | Roman Konoplya | R. A. Konoplya, C. Molina | The ringing wormholes | 5 pages, 3 figures, one table | Phys.Rev.D71:124009,2005 | 10.1103/PhysRevD.71.124009 | null | gr-qc astro-ph hep-th | null | We investigate the response of the traversable wormholes to the external
perturbations through finding their characteristic frequencies and time-domain
profiles. The considered solution describes traversable wormholes between the
branes in the two brane Randall-Sundrum model and was previously found within
Einstein g... | [
{
"created": "Thu, 28 Apr 2005 14:31:19 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Konoplya",
"R. A.",
""
],
[
"Molina",
"C.",
""
]
] | We investigate the response of the traversable wormholes to the external perturbations through finding their characteristic frequencies and time-domain profiles. The considered solution describes traversable wormholes between the branes in the two brane Randall-Sundrum model and was previously found within Einstein gra... |
2211.14955 | Gregory B. Cook | Gregory B. Cook and Suhan Lu | New total transmission modes of the Kerr geometry with Schwarzschild
limit frequencies at complex infinity | 19 pages, 13 figures, 5 tables, correcting references and various
typos | null | 10.1103/PhysRevD.107.044043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In addition to the well-known quasinormal modes, the gravitational modes of
the Kerr geometry also include sets of total-transmission modes. Each mode can
be considered as an element of a sequence of modes parameterized by the angular
momentum of the black hole. One family of gravitational total-transmission
modes of... | [
{
"created": "Sun, 27 Nov 2022 22:22:12 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Jan 2023 20:47:15 GMT",
"version": "v2"
}
] | 2023-03-08 | [
[
"Cook",
"Gregory B.",
""
],
[
"Lu",
"Suhan",
""
]
] | In addition to the well-known quasinormal modes, the gravitational modes of the Kerr geometry also include sets of total-transmission modes. Each mode can be considered as an element of a sequence of modes parameterized by the angular momentum of the black hole. One family of gravitational total-transmission modes of K... |
1807.11198 | Giovanni Manfredi | Gabriel Chardin and Giovanni Manfredi | Gravity, antimatter and the Dirac-Milne universe | Proceedings of the Low Energy Antiproton Physics Conference (LEAP),
Sorbonne University, Paris, March 12th to 16th, 2018 | null | 10.1007/s10751-018-1521-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the main arguments against antigravity, a different acceleration of
antimatter relative to matter in a gravitational field, discussing and
challenging Morrison's, Good's and Schiff's arguments. Following Price, we show
that, very surprisingly, the usual expression of the Equivalence Principle is
violated by... | [
{
"created": "Mon, 30 Jul 2018 07:22:57 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Chardin",
"Gabriel",
""
],
[
"Manfredi",
"Giovanni",
""
]
] | We review the main arguments against antigravity, a different acceleration of antimatter relative to matter in a gravitational field, discussing and challenging Morrison's, Good's and Schiff's arguments. Following Price, we show that, very surprisingly, the usual expression of the Equivalence Principle is violated by G... |
0806.4825 | Raul Horvat | R. Horvat | On Internal Consistency of Holographic Dark Energy Models | 8 pages, version to appear in JCAP | JCAP0810:022,2008 | 10.1088/1475-7516/2008/10/022 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Holographic dark energy (HDE) models, underlain by an effective quantum field
theory (QFT) with a manifest UV/IR connection, have become a convincing
candidate for the dark energy in the universe. On the other hand, the maximum
number of quantum states a conventional QFT in the box of size $L$ is capable
to describe,... | [
{
"created": "Mon, 30 Jun 2008 08:25:06 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Sep 2008 14:29:30 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Horvat",
"R.",
""
]
] | Holographic dark energy (HDE) models, underlain by an effective quantum field theory (QFT) with a manifest UV/IR connection, have become a convincing candidate for the dark energy in the universe. On the other hand, the maximum number of quantum states a conventional QFT in the box of size $L$ is capable to describe, r... |
gr-qc/0511075 | Vasileios Paschalidis | V. Paschalidis, A. M. Khokhlov, I. D. Novikov | Well-posed constrained evolution of 3+1 formulations of General
Relativity | Accepted to PRD, typos corrected, added references, extension of the
analysis | Phys.Rev.D75:024026,2007 | 10.1103/PhysRevD.75.024026 | null | gr-qc astro-ph | null | We present an analysis of well-posedness of constrained evolution of 3+1
formulations of GR. In this analysis we explicitly take into account the energy
and momentum constraints as well as possible algebraic constraints on the
evolution of high-frequency perturbations of solutions of Einstein's equations.
In this res... | [
{
"created": "Mon, 14 Nov 2005 17:37:22 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Nov 2005 18:00:01 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Dec 2006 08:49:19 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Paschalidis",
"V.",
""
],
[
"Khokhlov",
"A. M.",
""
],
[
"Novikov",
"I. D.",
""
]
] | We present an analysis of well-posedness of constrained evolution of 3+1 formulations of GR. In this analysis we explicitly take into account the energy and momentum constraints as well as possible algebraic constraints on the evolution of high-frequency perturbations of solutions of Einstein's equations. In this respe... |
0909.0334 | Masahiro Shimano | Masahiro Shimano, and Tomohiro Harada | Observational constraints of a power spectrum from super-inflation in
Loop Quantum Cosmology | 17 pages, 3 figures, Accepted for Physical Review D | Phys.Rev.D80:063538,2009 | 10.1103/PhysRevD.80.063538 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In loop quantum cosmology there may be a super-inflation phase in the very
early universe, in which a single scalar field with a negative power-law
potential $V= -M^4(\phi/M)^\beta$ plays important roles. Since the effective
horizon $\sqrt{SD}/H$ controls the behavior of quantum fluctuation instead of
the usual Hubbl... | [
{
"created": "Wed, 2 Sep 2009 06:59:43 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2009 09:02:10 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Shimano",
"Masahiro",
""
],
[
"Harada",
"Tomohiro",
""
]
] | In loop quantum cosmology there may be a super-inflation phase in the very early universe, in which a single scalar field with a negative power-law potential $V= -M^4(\phi/M)^\beta$ plays important roles. Since the effective horizon $\sqrt{SD}/H$ controls the behavior of quantum fluctuation instead of the usual Hubble ... |
gr-qc/0508077 | Charles Francis M.A. Ph.D. | Charles Francis | The spacetime metric in particle QED | 12 pages, 3 figures | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A small time delay between interactions, which has previously been shown to
remove divergences from QED, is used to show that, if spacetime geometry is
emergent from particle interactions in the manner suggested by Bondi, then
Minkowski metric, which appears in the Schroedinger equation as a requirement
of the probab... | [
{
"created": "Thu, 18 Aug 2005 18:59:45 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2006 07:23:33 GMT",
"version": "v2"
},
{
"created": "Thu, 4 May 2006 06:42:49 GMT",
"version": "v3"
},
{
"created": "Thu, 25 May 2006 13:58:38 GMT",
"version": "v4"
},
{
"cr... | 2014-11-13 | [
[
"Francis",
"Charles",
""
]
] | A small time delay between interactions, which has previously been shown to remove divergences from QED, is used to show that, if spacetime geometry is emergent from particle interactions in the manner suggested by Bondi, then Minkowski metric, which appears in the Schroedinger equation as a requirement of the probabil... |
gr-qc/0301040 | Luca Lusanna | Luca Lusanna (INFN, Firenze) and Massimo Pauri (Univ. Parma) | General Covariance and the Objectivity of Space-Time Point-Events: The
Physical Role of Gravitational and Gauge Degrees of Freedom in General
Relativity | 87 pages, latex | null | null | null | gr-qc astro-ph hep-th | null | (Abridged Abstract) This paper deals with a number of technical achievements
that are instrumental for a dis-solution of the so-called {\it Hole Argument}
in general relativity. The work is carried through in metric gravity for the
class of Christoudoulou-Klainermann space-times, in which the temporal
evolution is ru... | [
{
"created": "Fri, 10 Jan 2003 16:55:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lusanna",
"Luca",
"",
"INFN, Firenze"
],
[
"Pauri",
"Massimo",
"",
"Univ. Parma"
]
] | (Abridged Abstract) This paper deals with a number of technical achievements that are instrumental for a dis-solution of the so-called {\it Hole Argument} in general relativity. The work is carried through in metric gravity for the class of Christoudoulou-Klainermann space-times, in which the temporal evolution is rule... |
gr-qc/0403097 | Ragab Gad | Ragab M. Gad | Energy and momentum associated with a Static Axially Symmetric Vacuum
Space-Time | 9 pages, References added, typos corrected [Admin note: substantial
overlap with gr-qc/0404108, gr-qc/0403039] | Mod.Phys.Lett. A19 (2004) 1847-1854 | 10.1142/S0217732304014744 | null | gr-qc | null | We use the Einstein and Papapetrou energy-momentum complexes to calculate the
energy and momentum densities of Weyl metric as well as Curzon metric. We show
that these two different definitions of energy-momentum complexes do not
provide the same energy density for Weyl metric, although they give the same
momentum de... | [
{
"created": "Wed, 24 Mar 2004 19:59:29 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Apr 2004 12:16:26 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Gad",
"Ragab M.",
""
]
] | We use the Einstein and Papapetrou energy-momentum complexes to calculate the energy and momentum densities of Weyl metric as well as Curzon metric. We show that these two different definitions of energy-momentum complexes do not provide the same energy density for Weyl metric, although they give the same momentum dens... |
2202.07131 | Jun Zhang | Sebastian Garcia-Saenz, Aaron Held, Jun Zhang | Schwarzschild quasi-normal modes of non-minimally coupled vector fields | 34 pages, 9 figures, 5 tables, typos corrected, discussion added, v2
matches version published in JHEP | null | 10.1007/JHEP05(2022)139 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study perturbations of massive and massless vector fields on a
Schwarzschild black-hole background, including a non-minimal coupling between
the vector field and the curvature. The coupling is given by the Horndeski
vector-tensor operator, which we show to be unique, also when the field is
massive, provided that t... | [
{
"created": "Tue, 15 Feb 2022 02:06:39 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2022 08:14:39 GMT",
"version": "v2"
}
] | 2022-06-08 | [
[
"Garcia-Saenz",
"Sebastian",
""
],
[
"Held",
"Aaron",
""
],
[
"Zhang",
"Jun",
""
]
] | We study perturbations of massive and massless vector fields on a Schwarzschild black-hole background, including a non-minimal coupling between the vector field and the curvature. The coupling is given by the Horndeski vector-tensor operator, which we show to be unique, also when the field is massive, provided that the... |
2309.10499 | Johannes Fankhauser | Johannes Fankhauser, James Read | Gravitational redshift revisited: inertia, geometry, and charge | Pre-print, 13 pages, 5 figures | null | null | null | gr-qc physics.hist-ph | http://creativecommons.org/licenses/by/4.0/ | Gravitational redshift effects undoubtedly exist; moreover, the experimental
setups which confirm the existence of these effects - the most famous of which
being the Pound-Rebka experiment - are well-known. Nonetheless - and perhaps
surprisingly - there remains a great deal of confusion in the literature
regarding wh... | [
{
"created": "Tue, 19 Sep 2023 10:20:50 GMT",
"version": "v1"
}
] | 2023-09-20 | [
[
"Fankhauser",
"Johannes",
""
],
[
"Read",
"James",
""
]
] | Gravitational redshift effects undoubtedly exist; moreover, the experimental setups which confirm the existence of these effects - the most famous of which being the Pound-Rebka experiment - are well-known. Nonetheless - and perhaps surprisingly - there remains a great deal of confusion in the literature regarding what... |
2011.01958 | Alessandro Nagar | Stefano Schmidt, Matteo Breschi, Rossella Gamba, Giulia Pagano, Piero
Rettegno, Gunnar Riemenschneider, Sebastiano Bernuzzi, Alessandro Nagar and
Walter Del Pozzo | Machine Learning Gravitational Waves from Binary Black Hole Mergers | 15 pages, 11 figures, submitted to Phys. Rev. D | Phys. Rev. D 103, 043020 (2021) | 10.1103/PhysRevD.103.043020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply machine learning methods to build a time-domain model for
gravitational waveforms from binary black hole mergers, called mlgw. The
dimensionality of the problem is handled by representing the waveform's
amplitude and phase using a principal component analysis. We train mlgw on
about $\mathcal{O}(10^3)$ TEOBR... | [
{
"created": "Tue, 3 Nov 2020 19:01:47 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Schmidt",
"Stefano",
""
],
[
"Breschi",
"Matteo",
""
],
[
"Gamba",
"Rossella",
""
],
[
"Pagano",
"Giulia",
""
],
[
"Rettegno",
"Piero",
""
],
[
"Riemenschneider",
"Gunnar",
""
],
[
"Bernuzzi",
"Sebastiano",
... | We apply machine learning methods to build a time-domain model for gravitational waveforms from binary black hole mergers, called mlgw. The dimensionality of the problem is handled by representing the waveform's amplitude and phase using a principal component analysis. We train mlgw on about $\mathcal{O}(10^3)$ TEOBRes... |
1309.0224 | Vyacheslav Ivanovich Dokuchaev | Vyacheslav I. Dokuchaev | Mass inflation inside black holes revisited | 14 pages, 2 figures, Fig. 1 is proofed | Class. Quantum Grav. 31 (2014) 055009 | 10.1088/0264-9381/31/5/055009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass inflation phenomenon implies that black hole interiors are unstable
due to a back-reaction divergence of the perturbed black hole mass function at
the Cauchy horizon. Weak point in the standard mass inflation calculations is
in a fallacious using of the global Cauchy horizon as a place for the maximal
growth... | [
{
"created": "Sun, 1 Sep 2013 14:14:19 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Dec 2013 17:58:53 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jan 2014 14:10:28 GMT",
"version": "v3"
},
{
"created": "Fri, 21 Feb 2014 12:24:16 GMT",
"version": "v4"
}
] | 2014-03-05 | [
[
"Dokuchaev",
"Vyacheslav I.",
""
]
] | The mass inflation phenomenon implies that black hole interiors are unstable due to a back-reaction divergence of the perturbed black hole mass function at the Cauchy horizon. Weak point in the standard mass inflation calculations is in a fallacious using of the global Cauchy horizon as a place for the maximal growth o... |
0805.3208 | Biplab Raychaudhuri | B. Raychaudhuri, F. Rahaman, M. Kalam and A. Ghosh | Motion of Massive and Massless Test particles in Dyadosphere Geometry | 13 pages, 6 figures (attached as latex files generated by GNUPLOT) | null | 10.1142/S0217732309029971 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motion of massive and massless test particle in equilibrium and
non-equilibrium case is discussed in a dyadosphere geometry through
Hamilton-Jacobi method. Geodesics of particles are discussed through Lagrangian
method too. Scalar wave equation for massless particle is analyzed to show the
absence of superradiance.
| [
{
"created": "Wed, 21 May 2008 07:28:53 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Raychaudhuri",
"B.",
""
],
[
"Rahaman",
"F.",
""
],
[
"Kalam",
"M.",
""
],
[
"Ghosh",
"A.",
""
]
] | Motion of massive and massless test particle in equilibrium and non-equilibrium case is discussed in a dyadosphere geometry through Hamilton-Jacobi method. Geodesics of particles are discussed through Lagrangian method too. Scalar wave equation for massless particle is analyzed to show the absence of superradiance. |
gr-qc/0309102 | Eran Rosenthal | Amos Ori and Eran Rosenthal | Calculation of the Self Force using the Extended-Object Approach | 1 Figure | J.Math.Phys. 45 (2004) 2347-2364 | 10.1063/1.1737052 | null | gr-qc | null | We present here the extended-object approach for the explanation and
calculation of the self-force phenomenon. In this approach, one considers a
charged extended object of a finite size $\epsilon$ that accelerates in a
nontrivial manner, and calculates the total force exerted on it by the
electromagnetic field (whose... | [
{
"created": "Sun, 21 Sep 2003 11:51:31 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Ori",
"Amos",
""
],
[
"Rosenthal",
"Eran",
""
]
] | We present here the extended-object approach for the explanation and calculation of the self-force phenomenon. In this approach, one considers a charged extended object of a finite size $\epsilon$ that accelerates in a nontrivial manner, and calculates the total force exerted on it by the electromagnetic field (whose s... |
gr-qc/0305062 | Jonn Miritzis | John Miritzis | Dynamical system approach to FRW models in higher-order gravity theories | 3 figures, to appear in JMP | J.Math.Phys. 44 (2003) 3900-3910 | 10.1063/1.1602161 | null | gr-qc | null | We study the late time evolution of positively curved FRW models with a
scalar field which arises in the conformal frame of the $R+\alpha R^{2}$
theory. The resulted three-dimensional dynamical system has two equilibrium
solutions corresponding to a de Sitter space and an ever expanding closed
universe. We analyze th... | [
{
"created": "Fri, 16 May 2003 05:37:49 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Miritzis",
"John",
""
]
] | We study the late time evolution of positively curved FRW models with a scalar field which arises in the conformal frame of the $R+\alpha R^{2}$ theory. The resulted three-dimensional dynamical system has two equilibrium solutions corresponding to a de Sitter space and an ever expanding closed universe. We analyze the ... |
1805.03026 | David Brizuela | David Brizuela, I\~naki Garay | Hamiltonian formalism and constraint analysis of three-form matter
models coupled with general relativity | 12 pages | Phys. Rev. D 97, 124054 (2018) | 10.1103/PhysRevD.97.124054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Hamiltonian analysis of models given by a three-form field with a generic
potential coupled to general relativity in four dimensions is performed. This
kind of fields are naturally present in string theory and cosmological
scenarios. In particular, the action that will be considered has been
extensively used during... | [
{
"created": "Tue, 8 May 2018 13:56:03 GMT",
"version": "v1"
}
] | 2018-06-27 | [
[
"Brizuela",
"David",
""
],
[
"Garay",
"Iñaki",
""
]
] | A Hamiltonian analysis of models given by a three-form field with a generic potential coupled to general relativity in four dimensions is performed. This kind of fields are naturally present in string theory and cosmological scenarios. In particular, the action that will be considered has been extensively used during t... |
2107.14318 | Hang Yu | Hang Yu and Yijun Wang and Brian Seymour and Yanbei Chen | Detecting gravitational lensing in hierarchical triples in galactic
nuclei with space-borne gravitational-wave observatories | 17 pages, 5 figures; published in PRD | Phys. Rev. D 104, 103011 (2021) | 10.1103/PhysRevD.104.103011 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Stellar-mass binary black holes (BBHs) may merge in the vicinity of a
supermassive black hole (SMBH). It is suggested that the gravitational-wave
(GW) emitted by a BBH has a high probability to be lensed by the SMBH if the
BBH's orbit around the SMBH (i.e., the outer orbit) has a period of less than a
year and is les... | [
{
"created": "Thu, 29 Jul 2021 20:34:11 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2023 16:33:03 GMT",
"version": "v2"
}
] | 2023-12-29 | [
[
"Yu",
"Hang",
""
],
[
"Wang",
"Yijun",
""
],
[
"Seymour",
"Brian",
""
],
[
"Chen",
"Yanbei",
""
]
] | Stellar-mass binary black holes (BBHs) may merge in the vicinity of a supermassive black hole (SMBH). It is suggested that the gravitational-wave (GW) emitted by a BBH has a high probability to be lensed by the SMBH if the BBH's orbit around the SMBH (i.e., the outer orbit) has a period of less than a year and is less ... |
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