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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2202.00025 | Konstantin Leyde | Konstantin Leyde, Simone Mastrogiovanni, Dani\`ele A. Steer, Eric
Chassande-Mottin, Christos Karathanasis | Current and future constraints on cosmology and modified gravitational
wave friction from binary black holes | 43 pages | null | 10.1088/1475-7516/2022/09/012 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave (GW) standard sirens are well-established probes with
which one can measure cosmological parameters, and are complementary to other
probes like the cosmic microwave background or supernovae standard candles.
Here we focus on dark GW sirens, specifically binary black holes (BBHs) for
which there is ... | [
{
"created": "Mon, 31 Jan 2022 19:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2022 12:13:39 GMT",
"version": "v2"
}
] | 2022-09-15 | [
[
"Leyde",
"Konstantin",
""
],
[
"Mastrogiovanni",
"Simone",
""
],
[
"Steer",
"Danièle A.",
""
],
[
"Chassande-Mottin",
"Eric",
""
],
[
"Karathanasis",
"Christos",
""
]
] | Gravitational wave (GW) standard sirens are well-established probes with which one can measure cosmological parameters, and are complementary to other probes like the cosmic microwave background or supernovae standard candles. Here we focus on dark GW sirens, specifically binary black holes (BBHs) for which there is on... |
0708.2381 | Rickard Jonsson | Rickard Jonsson | Embedding spacetime via a geodesically equivalent metric of Euclidean
signature | 28 pages, 17 figures. As compared to the published version there are
corrections to Eqs. 46-49 (no impact on the discussion) and minor cosmetical
updates in the figures. An addendum is also included, 5 pages, 2 figures | Gen.Rel.Grav.33:1207,2001 | 10.1023/A:1012037418513 | null | gr-qc | null | Starting from the equations of motion in a 1 + 1 static, diagonal, Lorentzian
spacetime, such as the Schwarzschild radial line element, I find another
metric, but with Euclidean signature, which produces the same geodesics x(t).
This geodesically equivalent, or dual, metric can be embedded in ordinary
Euclidean space... | [
{
"created": "Fri, 17 Aug 2007 15:28:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jonsson",
"Rickard",
""
]
] | Starting from the equations of motion in a 1 + 1 static, diagonal, Lorentzian spacetime, such as the Schwarzschild radial line element, I find another metric, but with Euclidean signature, which produces the same geodesics x(t). This geodesically equivalent, or dual, metric can be embedded in ordinary Euclidean space. ... |
1105.2696 | Pankaj Sharan | Pankaj Sharan | Poincare Cartan Form for Gauge Fields in Curved Background | Latex2e 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The `directly Hamiltonian' field theory in the extended phase space is
applied to gauge fields in curved spacetime background. These fields being
differential 1-forms, have canonical momenta which are 2-forms. The
Poincare-Cartan 4-forms for matter and gauge fields have to be modified with
the exterior derivatives re... | [
{
"created": "Fri, 13 May 2011 11:57:32 GMT",
"version": "v1"
}
] | 2011-05-16 | [
[
"Sharan",
"Pankaj",
""
]
] | The `directly Hamiltonian' field theory in the extended phase space is applied to gauge fields in curved spacetime background. These fields being differential 1-forms, have canonical momenta which are 2-forms. The Poincare-Cartan 4-forms for matter and gauge fields have to be modified with the exterior derivatives repl... |
gr-qc/9903001 | Dr. R. J. Slagter | Reinoud J. Slagter (University of Amsterdam) | High-Frequency Gravitational Waves from Hairy Black Holes | 5 pages in REVTEX. To appear in the proceedings of the XXXIV-th
Rencontres de Moriond on "Gravitational Waves and Experimental Gravity", Les
Arcs, France [January 23-30, 1999] | null | null | null | gr-qc | null | We investigated the stability of the spherically symmetric non-abelian
(Bartnik-McKinnon) black hole solution of the SU(2) Einstein-Yang-Mills system
using the multiple-scale analysis. It is found, in contrast with the vacuum
situation, that a spherically symmetric oscillatory perturbation to second
order cannot be c... | [
{
"created": "Sat, 27 Feb 1999 21:22:28 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Mar 1999 10:01:06 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Slagter",
"Reinoud J.",
"",
"University of Amsterdam"
]
] | We investigated the stability of the spherically symmetric non-abelian (Bartnik-McKinnon) black hole solution of the SU(2) Einstein-Yang-Mills system using the multiple-scale analysis. It is found, in contrast with the vacuum situation, that a spherically symmetric oscillatory perturbation to second order cannot be con... |
gr-qc/0411089 | Guillermo A. Mena Marugan | Pablo Galan and Guillermo A. Mena Marugan | Quantum Time Uncertainty in a Gravity's Rainbow Formalism | 8 pages, accepted for publication in Physical Review D | Phys.Rev. D70 (2004) 124003 | 10.1103/PhysRevD.70.124003 | null | gr-qc | null | The existence of a minimum time uncertainty is usually argued to be a
consequence of the combination of quantum mechanics and general relativity.
Most of the studies that point to this result are nonetheless based on
perturbative quantization approaches, in which the effect of matter on the
geometry is regarded as a ... | [
{
"created": "Wed, 17 Nov 2004 14:33:24 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Galan",
"Pablo",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | The existence of a minimum time uncertainty is usually argued to be a consequence of the combination of quantum mechanics and general relativity. Most of the studies that point to this result are nonetheless based on perturbative quantization approaches, in which the effect of matter on the geometry is regarded as a co... |
gr-qc/0403061 | Izzet Sakalli | I.Sakalli and M.Halilsoy | Solution of Dirac equation in the near horizon geometry of an extreme
Kerr black hole | 20 pages, no figure, to be appeared in Phys.Rev.D | Phys.Rev. D69 (2004) 124012 | 10.1103/PhysRevD.69.124012 | null | gr-qc | null | Dirac equation is solved in the near horizon limit geometry of an extreme
Kerr black hole. We decouple equations first as usual, into an axial and
angular part. The axial equation turns out to be independent of the mass and is
solved exactly. The angular equation reduces, in the massless case, to a
confluent Heun equ... | [
{
"created": "Mon, 15 Mar 2004 09:41:28 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Mar 2004 09:58:28 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Sakalli",
"I.",
""
],
[
"Halilsoy",
"M.",
""
]
] | Dirac equation is solved in the near horizon limit geometry of an extreme Kerr black hole. We decouple equations first as usual, into an axial and angular part. The axial equation turns out to be independent of the mass and is solved exactly. The angular equation reduces, in the massless case, to a confluent Heun equat... |
0906.4580 | Alexis Larranaga | Alexis Larranaga, J. M. Tejeiro | Constraint on the Mass of Primordial Black Holes from the Value of the
Cosmological Constant | 4 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent propposal, the cosmological constant has been considered as as a
new thermodynamical variable and its change is related to the radiation
produced by black holes. Using this consideration and by modelling the
primordial black holes as Schwarzschild-de Sitter holes,we have constrained the
total mass of prim... | [
{
"created": "Wed, 24 Jun 2009 23:37:25 GMT",
"version": "v1"
}
] | 2009-06-26 | [
[
"Larranaga",
"Alexis",
""
],
[
"Tejeiro",
"J. M.",
""
]
] | In a recent propposal, the cosmological constant has been considered as as a new thermodynamical variable and its change is related to the radiation produced by black holes. Using this consideration and by modelling the primordial black holes as Schwarzschild-de Sitter holes,we have constrained the total mass of primor... |
2403.13155 | Sujoy Modak | Sujoy K. Modak | Recent Efforts Towards Understanding the Early Universe from a
Fundamental Quantum Perspective | 27 pages, no figures, Invited Pedagogic Review article for JPRE,
North Bengal University | J. Phys. Res. Edu. Vol 2, pp 16-35 (2024) | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The observable universe is fundamentally inhomogeneous and anisotropic.
Quantum description of the generation of these inhomogeneities and anisotropies
is ill-understood and unsatisfactory. After providing a brief account of the
standard approach of the generation of the classical density perturbations
starting from ... | [
{
"created": "Tue, 19 Mar 2024 21:07:36 GMT",
"version": "v1"
}
] | 2024-04-05 | [
[
"Modak",
"Sujoy K.",
""
]
] | The observable universe is fundamentally inhomogeneous and anisotropic. Quantum description of the generation of these inhomogeneities and anisotropies is ill-understood and unsatisfactory. After providing a brief account of the standard approach of the generation of the classical density perturbations starting from th... |
gr-qc/9306008 | Boris Spokoiny | Boris Spokoiny | Deflationary Universe Scenario | 18p, KUNS-1201 Plain TeX, phyzzx. Reference file is included which
previously was missed | Phys.Lett.B315:40-45,1993 | 10.1016/0370-2693(93)90155-B | null | gr-qc | null | We show that it is possible to realize an inflationary scenario even without
conversion of the false vacuum energy to radiation. Such cosmological models
have a deflationary stage in which $Ha^2$ is decreasing and radiation produced
by particle creation in an expanding Universe becomes dominant. The preceding
inflati... | [
{
"created": "Fri, 4 Jun 1993 12:42:31 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 1993 16:42:50 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Spokoiny",
"Boris",
""
]
] | We show that it is possible to realize an inflationary scenario even without conversion of the false vacuum energy to radiation. Such cosmological models have a deflationary stage in which $Ha^2$ is decreasing and radiation produced by particle creation in an expanding Universe becomes dominant. The preceding inflation... |
2208.09991 | Rui-Hui Lin | Jing Yang, Rui-Hui Lin and Xiang-Hua Zhai | Viscous cosmology in $f(T)$ gravity | accepted by Eur. Phys. J. C | null | 10.1140/epjc/s10052-022-11008-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We propose a new model for the viscosity of cosmic matters, which can be
applied to different epochs of the universe. Using this model, we include the
bulk viscosities as practical corrections to the perfect fluid models of the
baryonic and dark matters since the material fluids in the real world may have
viscosities... | [
{
"created": "Mon, 22 Aug 2022 00:16:14 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2022 08:32:12 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Yang",
"Jing",
""
],
[
"Lin",
"Rui-Hui",
""
],
[
"Zhai",
"Xiang-Hua",
""
]
] | We propose a new model for the viscosity of cosmic matters, which can be applied to different epochs of the universe. Using this model, we include the bulk viscosities as practical corrections to the perfect fluid models of the baryonic and dark matters since the material fluids in the real world may have viscosities d... |
2308.10949 | Hongguang Liu | Kristina Giesel, Hongguang Liu, Eric Rullit, Parampreet Singh, Stefan
Andreas Weigl | Embedding generalized LTB models in polymerized spherically symmetric
spacetimes | 31 pages,1 figure | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the existing works on the way (generalized) LTB models can be
embedded into polymerized spherically symmetric models in several aspects. We
re-examine such an embedding at the classical level and show that a suitable
LTB condition can only be treated as a gauge fixing in the non-marginally bound
case, w... | [
{
"created": "Mon, 21 Aug 2023 18:00:10 GMT",
"version": "v1"
}
] | 2023-08-23 | [
[
"Giesel",
"Kristina",
""
],
[
"Liu",
"Hongguang",
""
],
[
"Rullit",
"Eric",
""
],
[
"Singh",
"Parampreet",
""
],
[
"Weigl",
"Stefan Andreas",
""
]
] | We generalize the existing works on the way (generalized) LTB models can be embedded into polymerized spherically symmetric models in several aspects. We re-examine such an embedding at the classical level and show that a suitable LTB condition can only be treated as a gauge fixing in the non-marginally bound case, whi... |
gr-qc/9211028 | Arley Anderson | Arlen Anderson | Thawing the Frozen Formalism: The Difference Between Observables and
What We Observe | 18 pages | null | null | Imperial/TP/92-93/09 | gr-qc hep-th | null | In a parametrized and constrained Hamiltonian system, an observable is an
operator which commutes with all (first-class) constraints, including the
super-Hamiltonian. The problem of the frozen formalism is to explain how
dynamics is possible when all observables are constants of the motion. An
explicit model of a mea... | [
{
"created": "Wed, 25 Nov 1992 22:03:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anderson",
"Arlen",
""
]
] | In a parametrized and constrained Hamiltonian system, an observable is an operator which commutes with all (first-class) constraints, including the super-Hamiltonian. The problem of the frozen formalism is to explain how dynamics is possible when all observables are constants of the motion. An explicit model of a measu... |
gr-qc/9907097 | Juan A. Valiente | J.A. Valiente-Kroon | Polyhomogeneity and zero-rest-mass fields with applications to
Newman-Penrose constants | 19 pages | Class.Quant.Grav.17:605-621,2000 | 10.1088/0264-9381/17/3/304 | null | gr-qc | null | A discussion of polyhomogeneity (asymptotic expansions in terms of $1/r$ and
$\ln r$) for zero-rest-mass fields and gravity and its relation with the
Newman-Penrose (NP) constants is given. It is shown that for spin-$s$
zero-rest-mass fields propagating on Minkowski spacetime, the logarithmic terms
in the asymptotic ... | [
{
"created": "Wed, 28 Jul 1999 17:31:12 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Valiente-Kroon",
"J. A.",
""
]
] | A discussion of polyhomogeneity (asymptotic expansions in terms of $1/r$ and $\ln r$) for zero-rest-mass fields and gravity and its relation with the Newman-Penrose (NP) constants is given. It is shown that for spin-$s$ zero-rest-mass fields propagating on Minkowski spacetime, the logarithmic terms in the asymptotic ex... |
gr-qc/9711034 | Ori Amos | Amos Ori | Transmission and reflection coefficients for a scalar field inside a
charged black hole | 7 pages, RevTeX, no figures. Accepted to Phys. Rev. D (Brief Report) | Phys.Rev. D57 (1998) 2621-2623 | 10.1103/PhysRevD.57.2621 | null | gr-qc | null | Using the late-time expansion we calculate the leading-order coefficients
describing the evolution of a massless scalar field inside a Reissner-Nordstrom
black hole. These coefficients may be interpreted as the reflection and
transmission coefficients for scalar-field modes propagating from the event
horizon to the C... | [
{
"created": "Mon, 10 Nov 1997 11:44:11 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Ori",
"Amos",
""
]
] | Using the late-time expansion we calculate the leading-order coefficients describing the evolution of a massless scalar field inside a Reissner-Nordstrom black hole. These coefficients may be interpreted as the reflection and transmission coefficients for scalar-field modes propagating from the event horizon to the Cau... |
2405.06351 | Jun-Qi Guo | Yu Hu, Jun-Qi Guo, Junbin Li, Cheng-Gang Shao, Hongsheng Zhang | Energy in critical collapse | 8 pages, 7 figures | Commun.Theor.Phys. 75, 125402 (2023) | 10.1088/1572-9494/ad0029 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the energy issue in critical collapse of a spherically symmetric
scalar field. It is found that in critical collapse, the contribution from the
material energy is greater than that from the gravitational energy. The
quantity $m/r$ plays an important role in identifying the formation of apparent
horizon in gr... | [
{
"created": "Fri, 10 May 2024 09:31:18 GMT",
"version": "v1"
}
] | 2024-05-13 | [
[
"Hu",
"Yu",
""
],
[
"Guo",
"Jun-Qi",
""
],
[
"Li",
"Junbin",
""
],
[
"Shao",
"Cheng-Gang",
""
],
[
"Zhang",
"Hongsheng",
""
]
] | We study the energy issue in critical collapse of a spherically symmetric scalar field. It is found that in critical collapse, the contribution from the material energy is greater than that from the gravitational energy. The quantity $m/r$ plays an important role in identifying the formation of apparent horizon in grav... |
1801.03704 | Andrea Geralico | Donato Bini, Thibault Damour, Andrea Geralico | Spin-orbit precession along eccentric orbits: improving the knowledge of
self-force corrections and of their effective-one-body counterparts | 17 pages, 3 figures, revtex macros | Phys. Rev. D 97, 104046 (2018) | 10.1103/PhysRevD.97.104046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The (first-order) gravitational self-force correction to the spin-orbit
precession of a spinning compact body along a slightly eccentric orbit around a
Schwarzschild black hole is computed through the ninth post-Newtonian order,
improving recent results by Kavanagh et al. [Phys.\ Rev.\ D {\bf 96}, 064012
(2017).] Thi... | [
{
"created": "Thu, 11 Jan 2018 10:54:56 GMT",
"version": "v1"
}
] | 2018-05-30 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Geralico",
"Andrea",
""
]
] | The (first-order) gravitational self-force correction to the spin-orbit precession of a spinning compact body along a slightly eccentric orbit around a Schwarzschild black hole is computed through the ninth post-Newtonian order, improving recent results by Kavanagh et al. [Phys.\ Rev.\ D {\bf 96}, 064012 (2017).] This ... |
2007.10793 | Sanjar Shaymatov | Sanjar Shaymatov, Farruh Atamurotov | Geodesic circular orbits sharing the same orbital frequencies in the
black string spacetime | 5 pages, no figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we consider isofrequency pairing of geodesic orbits that share the same
three orbital frequencies associated with $\Omega^{\hat{r}}$,
$\Omega^{\hat{\varphi}}$, and $\Omega^{\hat{\omega}}$ in a particular region of
parameter space around black string spacetime geometry. We study the effect
arising from the extra ... | [
{
"created": "Tue, 21 Jul 2020 13:35:14 GMT",
"version": "v1"
}
] | 2020-07-22 | [
[
"Shaymatov",
"Sanjar",
""
],
[
"Atamurotov",
"Farruh",
""
]
] | Here we consider isofrequency pairing of geodesic orbits that share the same three orbital frequencies associated with $\Omega^{\hat{r}}$, $\Omega^{\hat{\varphi}}$, and $\Omega^{\hat{\omega}}$ in a particular region of parameter space around black string spacetime geometry. We study the effect arising from the extra co... |
0912.4852 | Alan Kostelecky | Brett Altschul, Quentin G. Bailey, and Alan Kostelecky | Lorentz violation with an antisymmetric tensor | 18 pages two-column REVTeX | Phys.Rev.D81:065028,2010 | 10.1103/PhysRevD.81.065028 | IUHET 537 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Field theories with spontaneous Lorentz violation involving an antisymmetric
2-tensor are studied. A general action including nonminimal gravitational
couplings is constructed, and features of the Nambu-Goldstone and massive modes
are discussed. Minimal models in Minkowski spacetime exhibit dualities with
Lorentz-vio... | [
{
"created": "Thu, 24 Dec 2009 12:46:05 GMT",
"version": "v1"
}
] | 2010-04-23 | [
[
"Altschul",
"Brett",
""
],
[
"Bailey",
"Quentin G.",
""
],
[
"Kostelecky",
"Alan",
""
]
] | Field theories with spontaneous Lorentz violation involving an antisymmetric 2-tensor are studied. A general action including nonminimal gravitational couplings is constructed, and features of the Nambu-Goldstone and massive modes are discussed. Minimal models in Minkowski spacetime exhibit dualities with Lorentz-viola... |
0912.0087 | Roland Haas | Tanja Bode, Roland Haas, Tamara Bogdanovic, Pablo Laguna and Deirdre
Shoemaker | Relativistic Mergers of Supermassive Black Holes and their
Electromagnetic Signatures | 19 pages, 15 figures, version accepted for publication | Astrophys.J.715:1117-1131,2010 | 10.1088/0004-637X/715/2/1117 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coincident detections of electromagnetic (EM) and gravitational wave (GW)
signatures from coalescence events of supermassive black holes are the next
observational grand challenge. Such detections will provide the means to study
cosmological evolution and accretion processes associated with these gargantuan
compact o... | [
{
"created": "Tue, 1 Dec 2009 20:50:26 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Apr 2010 20:14:11 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Bode",
"Tanja",
""
],
[
"Haas",
"Roland",
""
],
[
"Bogdanovic",
"Tamara",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Shoemaker",
"Deirdre",
""
]
] | Coincident detections of electromagnetic (EM) and gravitational wave (GW) signatures from coalescence events of supermassive black holes are the next observational grand challenge. Such detections will provide the means to study cosmological evolution and accretion processes associated with these gargantuan compact obj... |
2011.01216 | Pedro Talavera | J.M.Pons and P. Talavera | On cosmological expansion and local physics | 14 pages + appendices | null | 10.1007/s10714-021-02874-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find an exact convergence in the local dynamics described by two
supposedly antagonistic approaches in modern cosmology: one starting from an
expanding universe perspective such as FLRW, the other based on a local model
ignoring any notion of expansion, such as Schwarzschild dS. Both models are in
complete agreeme... | [
{
"created": "Mon, 2 Nov 2020 18:59:57 GMT",
"version": "v1"
}
] | 2021-12-08 | [
[
"Pons",
"J. M.",
""
],
[
"Talavera",
"P.",
""
]
] | We find an exact convergence in the local dynamics described by two supposedly antagonistic approaches in modern cosmology: one starting from an expanding universe perspective such as FLRW, the other based on a local model ignoring any notion of expansion, such as Schwarzschild dS. Both models are in complete agreement... |
1902.00160 | Kiyoshi Shiraishi | Kiyoshi Shiraishi | Classical and quantum scattering of maximally charged dilaton black
holes | 18 pages, 6 figures | Int.J.Mod.Phys. D2 (1993) 59-78 | 10.1142/S0218271893000052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical and the quantum scattering of two maximally-charged dilaton
black holes which have low velocities are studied. We find a critical value for
the dilaton coupling, $a^2=1/3$. For $a^2>1/3$, two black holes are always
scattered away and never coalesce together, regardless of the value of the
impact paramet... | [
{
"created": "Fri, 1 Feb 2019 03:26:40 GMT",
"version": "v1"
}
] | 2019-03-04 | [
[
"Shiraishi",
"Kiyoshi",
""
]
] | The classical and the quantum scattering of two maximally-charged dilaton black holes which have low velocities are studied. We find a critical value for the dilaton coupling, $a^2=1/3$. For $a^2>1/3$, two black holes are always scattered away and never coalesce together, regardless of the value of the impact parameter... |
gr-qc/0005063 | Duncan Noltingk | D.Noltingk | A Consistent Histories approach to the Unruh effect | 18 pages LaTeX | Int.J.Theor.Phys. 40 (2001) 1411-1426 | null | null | gr-qc | null | Using the HPO approach to consistent histories we re-derive Unruh's result
that an observer constantly accelerating through the Minkowski vacuum appears
to be immersed in a thermal bath. We show that propositions about any symmetry
of the system always form a consistent set and that the probabilities
associated with ... | [
{
"created": "Tue, 16 May 2000 14:23:05 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Noltingk",
"D.",
""
]
] | Using the HPO approach to consistent histories we re-derive Unruh's result that an observer constantly accelerating through the Minkowski vacuum appears to be immersed in a thermal bath. We show that propositions about any symmetry of the system always form a consistent set and that the probabilities associated with su... |
gr-qc/0209059 | Sergi R. Hildebrandt | Sergi R. Hildebrandt | Kerr-Schild and generalized metric motions | 65 pages | Gen. Rel. Grav., vol. 34 (2002) 65--118 | 10.1023/A:1015218505821 | null | gr-qc | null | In this work we study in detail new kinds of motions of the metric tensor.
The work is divided into two main parts. In the first part we study the general
existence of Kerr-Schild motions --a recently introduced metric motion. We show
that generically, Kerr-Schild motions give rise to finite dimensional Lie
algebras ... | [
{
"created": "Wed, 18 Sep 2002 17:40:07 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Hildebrandt",
"Sergi R.",
""
]
] | In this work we study in detail new kinds of motions of the metric tensor. The work is divided into two main parts. In the first part we study the general existence of Kerr-Schild motions --a recently introduced metric motion. We show that generically, Kerr-Schild motions give rise to finite dimensional Lie algebras an... |
gr-qc/0608048 | Farrukh Fattoyev Jabborovich | B. J. Ahmedov, A. V. Khugaev, N. I. Rakhmatov | Electromagnetic Fields of Charged and Magnetized Cylindrical Conductors
in NUT Space | 9 pages, 1 figure | Int.J.Mod.Phys. D14 (2005) 687-695 | 10.1142/S0218271805005979 | null | gr-qc astro-ph | null | We present analytic solutions of Maxwell equations for infinitely long
cylindrical conductors with nonvanishing electric charge and currents in the
external background spacetime of a line gravitomagnetic monopole. It has been
shown that vertical magnetic field arising around cylindrical conducting shell
carrying azim... | [
{
"created": "Wed, 9 Aug 2006 14:25:10 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ahmedov",
"B. J.",
""
],
[
"Khugaev",
"A. V.",
""
],
[
"Rakhmatov",
"N. I.",
""
]
] | We present analytic solutions of Maxwell equations for infinitely long cylindrical conductors with nonvanishing electric charge and currents in the external background spacetime of a line gravitomagnetic monopole. It has been shown that vertical magnetic field arising around cylindrical conducting shell carrying azimut... |
gr-qc/0011006 | Jarmo Makela | Jarmo Makela and Ruth M. Williams | Constraints on Area Variables in Regge Calculus | Typographical errors corrected | Class.Quant.Grav.18:L43,2001 | 10.1088/0264-9381/18/4/102 | null | gr-qc | null | We describe a general method of obtaining the constraints between area
variables in one approach to area Regge calculus, and illustrate it with a
simple example. The simplicial complex is the simplest tessellation of the
4-sphere. The number of independent constraints on the variations of the
triangle areas is shown ... | [
{
"created": "Thu, 2 Nov 2000 13:19:45 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2000 14:13:13 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Makela",
"Jarmo",
""
],
[
"Williams",
"Ruth M.",
""
]
] | We describe a general method of obtaining the constraints between area variables in one approach to area Regge calculus, and illustrate it with a simple example. The simplicial complex is the simplest tessellation of the 4-sphere. The number of independent constraints on the variations of the triangle areas is shown to... |
gr-qc/9602063 | Ivashchuk Vladimir Dmitrievich | V. R. Gavrilov, V. D. Ivashchuk and V. N. Melnikov | Multidimensional integrable vacuum cosmology with two curvatures | 21 pages, LaTex. 5 figures are available upon request (hard copy).
Submitted to Classical and Quantum Gravity | Class.Quant.Grav. 13 (1996) 3039-3056 | 10.1088/0264-9381/13/11/018 | RGS-CSVR-001/96 | gr-qc | null | The vacuum cosmological model on the manifold $R \times M_1 \times \ldots
\times M_n$ describing the evolution of $n$ Einstein spaces of non-zero
curvatures is considered. For $n = 2$ the Einstein equations are reduced to the
Abel (ordinary differential) equation and solved, when $(N_1 = $dim $ M_1, N_2
= $ dim$ M_2)... | [
{
"created": "Thu, 29 Feb 1996 19:22:09 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gavrilov",
"V. R.",
""
],
[
"Ivashchuk",
"V. D.",
""
],
[
"Melnikov",
"V. N.",
""
]
] | The vacuum cosmological model on the manifold $R \times M_1 \times \ldots \times M_n$ describing the evolution of $n$ Einstein spaces of non-zero curvatures is considered. For $n = 2$ the Einstein equations are reduced to the Abel (ordinary differential) equation and solved, when $(N_1 = $dim $ M_1, N_2 = $ dim$ M_2) =... |
2302.05877 | Enrique Alvarez | Enrique Alvarez, Jesus Anero and Irene Sanchez-Ruiz | Physical charges versus conformal invariance in unimodular gravity | LateX, 19 pages, figure included, revised | null | null | IFT-UAM/CSIC-23-15 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Unimodularity can be implemented in different ways. In this paper we consider
only the formulation of Unimodular Gravity in which the unimodular metric is
obtained out of an unrestricted one as $\g_{\m\n}=|g|^{-{1\over n}} g_{\m\n}$.
This procedure induces an extra Weyl symmetry. Some physical implications of
this sy... | [
{
"created": "Sun, 12 Feb 2023 09:31:12 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2023 11:33:38 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Mar 2023 16:56:01 GMT",
"version": "v3"
},
{
"created": "Fri, 5 May 2023 15:10:34 GMT",
"version": "v4"
},
{
"cre... | 2023-12-19 | [
[
"Alvarez",
"Enrique",
""
],
[
"Anero",
"Jesus",
""
],
[
"Sanchez-Ruiz",
"Irene",
""
]
] | Unimodularity can be implemented in different ways. In this paper we consider only the formulation of Unimodular Gravity in which the unimodular metric is obtained out of an unrestricted one as $\g_{\m\n}=|g|^{-{1\over n}} g_{\m\n}$. This procedure induces an extra Weyl symmetry. Some physical implications of this symm... |
1009.4585 | Daniele Malafarina | K. Lochan, D. Malafarina, T. P. Singh | Thermodynamics and the naked singularity in the Gamma-metric | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a possible way of establishing a parallel between the third
law of black hole mechanics, and the strong version of the third law of
thermodynamics. We calculate the surface gravity and area for a naked singular
null surface in the Gamma-metric and explain in what sense this behaviour
violates thermodyn... | [
{
"created": "Thu, 23 Sep 2010 11:41:27 GMT",
"version": "v1"
}
] | 2010-09-24 | [
[
"Lochan",
"K.",
""
],
[
"Malafarina",
"D.",
""
],
[
"Singh",
"T. P.",
""
]
] | We investigate a possible way of establishing a parallel between the third law of black hole mechanics, and the strong version of the third law of thermodynamics. We calculate the surface gravity and area for a naked singular null surface in the Gamma-metric and explain in what sense this behaviour violates thermodynam... |
2101.06649 | Grigoris Panotopoulos | Grigoris Panotopoulos, Angel Rincon and Ilidio Lopes | Interior solutions of relativistic stars with anisotropic matter in
scale-dependent gravity | 11 pages, 4 tables, 6 figures, accepted in EPJC | Eur. Phys. J. C (2021) 81:63 | 10.1140/epjc/s10052-021-08881-8 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain well behaved interior solutions describing hydrostatic equilibrium
of anisotropic relativistic stars in scale-dependent gravity, where Newton's
constant is allowed to vary with the radial coordinate throughout the star.
Assuming i) a linear equation-of-state in the MIT bag model for quark matter,
and ii) a ... | [
{
"created": "Sun, 17 Jan 2021 11:39:32 GMT",
"version": "v1"
}
] | 2021-01-26 | [
[
"Panotopoulos",
"Grigoris",
""
],
[
"Rincon",
"Angel",
""
],
[
"Lopes",
"Ilidio",
""
]
] | We obtain well behaved interior solutions describing hydrostatic equilibrium of anisotropic relativistic stars in scale-dependent gravity, where Newton's constant is allowed to vary with the radial coordinate throughout the star. Assuming i) a linear equation-of-state in the MIT bag model for quark matter, and ii) a ce... |
2403.08909 | Ivica Smoli\'c | Ana Bokuli\'c, Tajron Juri\'c, Ivica Smoli\'c | Hexadecapole at the heart of nonlinear electromagnetic fields | 9 pages (published version; one footnote added and one sentence
expanded) | Class. Quantum Grav. 41 (2024) 157002 | 10.1088/1361-6382/ad5c34 | ZTF-EP-24-03; RBI-ThPhys-2024-04 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In classical Maxwell's electromagnetism, monopole term of the electric field
is proportional to $r^{-2}$, while higher order multipole terms, sourced by
anisotropic sources, fall-off faster. However, in nonlinear electromagnetism
even a spherically symmetric field has multipole-like contributions. We prove
that the l... | [
{
"created": "Wed, 13 Mar 2024 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2024 08:24:13 GMT",
"version": "v2"
}
] | 2024-07-11 | [
[
"Bokulić",
"Ana",
""
],
[
"Jurić",
"Tajron",
""
],
[
"Smolić",
"Ivica",
""
]
] | In classical Maxwell's electromagnetism, monopole term of the electric field is proportional to $r^{-2}$, while higher order multipole terms, sourced by anisotropic sources, fall-off faster. However, in nonlinear electromagnetism even a spherically symmetric field has multipole-like contributions. We prove that the lea... |
2201.01650 | Edgardo Franzin | Edgardo Franzin, Stefano Liberati, Jacopo Mazza, Ramit Dey and Sumanta
Chakraborty | Scalar perturbations around rotating regular black holes and wormholes:
quasi-normal modes, ergoregion instability and superradiance | 13 pages, 6 figures; v2 and v3: Added clarifications after review,
published in PRD | Phys. Rev. D 105, 124051 (2022) | 10.1103/PhysRevD.105.124051 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scalar test-field perturbations on top of a Kerr--black-bounce
background, i.e. a family of rotating regular black holes and/or rotating
traversable wormholes that can mimic Kerr black holes. We compute the
quasi-normal modes for a massless field in both the regular black holes and
wormhole branches, confirm... | [
{
"created": "Wed, 5 Jan 2022 15:14:03 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jun 2022 07:57:47 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jun 2022 17:01:17 GMT",
"version": "v3"
}
] | 2022-06-30 | [
[
"Franzin",
"Edgardo",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Mazza",
"Jacopo",
""
],
[
"Dey",
"Ramit",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | We study scalar test-field perturbations on top of a Kerr--black-bounce background, i.e. a family of rotating regular black holes and/or rotating traversable wormholes that can mimic Kerr black holes. We compute the quasi-normal modes for a massless field in both the regular black holes and wormhole branches, confirmin... |
gr-qc/0102089 | Garcia | L.C.Garcia de Andrade | A note on the Limits to Global Rotation from Teleparallel G\"{o}del
Universe | Latex file | null | null | null | gr-qc | null | A teleparallel G\"{o}del universe is shown to lead to a simple and natural
relation between Cartan torsion and the global rotation of the universe.This is
straightforward if one uses the formalism of Cartan's calculus of exterior
differential forms.It is possible to place a limit on the global rotation from
the knowl... | [
{
"created": "Tue, 20 Feb 2001 22:09:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | A teleparallel G\"{o}del universe is shown to lead to a simple and natural relation between Cartan torsion and the global rotation of the universe.This is straightforward if one uses the formalism of Cartan's calculus of exterior differential forms.It is possible to place a limit on the global rotation from the knowled... |
gr-qc/0111017 | Choquet-Bruhat | Yvonne Choquet-Bruhat | Non strict and strict hyperbolic systems for the Einstein equations | 18 pages | null | null | null | gr-qc | null | The integration of the Einstein equations split into the solution of
constraints on an initial space like 3 - manifold, an essentially elliptic
system, and a system which will describe the dynamical evolution, modulo a
choice of gauge. We prove in this paper that the simplest gauge choice leads to
a system which is c... | [
{
"created": "Tue, 6 Nov 2001 19:34:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Choquet-Bruhat",
"Yvonne",
""
]
] | The integration of the Einstein equations split into the solution of constraints on an initial space like 3 - manifold, an essentially elliptic system, and a system which will describe the dynamical evolution, modulo a choice of gauge. We prove in this paper that the simplest gauge choice leads to a system which is cau... |
gr-qc/0508073 | R. R. Cuzinatto | R. Aldrovandi, R. R. Cuzinatto and L. G. Medeiros | Analytic solutions for the $\Lambda$-FRW Model | 17 pages, 2 figures; published version | Found.Phys.36:1736-1752,2006 | 10.1007/s10701-006-9076-6 | null | gr-qc astro-ph | null | The high precision attained by cosmological data in the last few years has
increased the interest in exact solutions. Analytic expressions for solutions
in the Standard Model are presented here for all combinations of $\Lambda = 0$,
$\Lambda \ne 0$, $\kappa = 0$ and $\kappa \ne 0$, in the presence and absence
of radi... | [
{
"created": "Wed, 17 Aug 2005 18:34:24 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2006 20:44:25 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Feb 2007 17:02:32 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Nov 2007 20:38:49 GMT",
"version": "v4"
}
] | 2009-09-29 | [
[
"Aldrovandi",
"R.",
""
],
[
"Cuzinatto",
"R. R.",
""
],
[
"Medeiros",
"L. G.",
""
]
] | The high precision attained by cosmological data in the last few years has increased the interest in exact solutions. Analytic expressions for solutions in the Standard Model are presented here for all combinations of $\Lambda = 0$, $\Lambda \ne 0$, $\kappa = 0$ and $\kappa \ne 0$, in the presence and absence of radiat... |
2312.06628 | Norma G. Sanchez | Diego J. Cirilo-Lombardo (Keldysh Institute of the Russian Academy of
Sciences and CONICET-UBA-INFINA), and Norma G. Sanchez (CNRS and The Chalonge
- Hector de Vega International School of Astrophysics) | Coherent states of quantum spacetimes for black holes and de Sitter
spacetime | 47 pages, 4 Figures, Published in Physical Review D, 7 December 2023 | Phys. Rev. D 108, 126001 (2023) | 10.1103/PhysRevD.108.126001 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We provide a group theory approach to coherent states describing quantum
space-time and its properties. This provides a relativistic framework for the
metric of a Riemmanian space with bosonic and fermionic coordinates, its
continuum and discrete states, and a kind of {\it"quantum optics"} for the
space-time. {\bf Ne... | [
{
"created": "Thu, 7 Dec 2023 19:54:15 GMT",
"version": "v1"
}
] | 2023-12-20 | [
[
"Cirilo-Lombardo",
"Diego J.",
"",
"Keldysh Institute of the Russian Academy of\n Sciences and CONICET-UBA-INFINA"
],
[
"Sanchez",
"Norma G.",
"",
"CNRS and The Chalonge\n - Hector de Vega International School of Astrophysics"
]
] | We provide a group theory approach to coherent states describing quantum space-time and its properties. This provides a relativistic framework for the metric of a Riemmanian space with bosonic and fermionic coordinates, its continuum and discrete states, and a kind of {\it"quantum optics"} for the space-time. {\bf New}... |
gr-qc/0106058 | Neil J. Cornish | Neil J. Cornish | Detecting a stochastic gravitational wave background with the Laser
Interferometer Space Antenna | 9 pages, 11 figures. Significant changes to the noise estimates | Phys.Rev.D65:022004,2002 | 10.1103/PhysRevD.65.022004 | null | gr-qc astro-ph | null | The random superposition of many weak sources will produce a stochastic
background of gravitational waves that may dominate the response of the LISA
(Laser Interferometer Space Antenna) gravitational wave observatory. Unless
something can be done to distinguish between a stochastic background and
detector noise, the ... | [
{
"created": "Mon, 18 Jun 2001 23:05:03 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2001 22:23:43 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Cornish",
"Neil J.",
""
]
] | The random superposition of many weak sources will produce a stochastic background of gravitational waves that may dominate the response of the LISA (Laser Interferometer Space Antenna) gravitational wave observatory. Unless something can be done to distinguish between a stochastic background and detector noise, the tw... |
2012.03804 | Joseph Romano | Joseph D. Romano, Jeffrey S. Hazboun, Xavier Siemens, Anne M.
Archibald | Common-spectrum process versus cross-correlation for gravitational-wave
searches using pulsar timing arrays | 9 pages, 3 figures | Phys. Rev. D 103, 063027 (2021) | 10.1103/PhysRevD.103.063027 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The North American Nanohertz Observatory for Gravitational Waves (NANOGrav)
has recently reported strong statistical evidence for a common-spectrum
red-noise process for all pulsars, as seen in their 12.5-yr analysis for an
isotropic stochastic gravitational-wave background. However, there is currently
very little ev... | [
{
"created": "Mon, 7 Dec 2020 15:45:31 GMT",
"version": "v1"
}
] | 2021-03-24 | [
[
"Romano",
"Joseph D.",
""
],
[
"Hazboun",
"Jeffrey S.",
""
],
[
"Siemens",
"Xavier",
""
],
[
"Archibald",
"Anne M.",
""
]
] | The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) has recently reported strong statistical evidence for a common-spectrum red-noise process for all pulsars, as seen in their 12.5-yr analysis for an isotropic stochastic gravitational-wave background. However, there is currently very little evid... |
gr-qc/9705012 | Jorma Louko | Dieter R. Brill, Jorma Louko, and Peter Peldan | Thermodynamics of (3+1)-dimensional black holes with toroidal or higher
genus horizons | 25 pages, REVTeX v3.1, contains 5 LaTeX figures. (Typos corrected,
references and minor comments added. To be published in Phys. Rev. D.) | Phys.Rev. D56 (1997) 3600-3610 | 10.1103/PhysRevD.56.3600 | PP97-111, USITP 97-6 | gr-qc | null | We examine counterparts of the Reissner-Nordstrom-anti-de Sitter black hole
spacetimes in which the two-sphere has been replaced by a surface Sigma of
constant negative or zero curvature. When horizons exist, the spacetimes are
black holes with an asymptotically locally anti-de Sitter infinity, but the
infinity topol... | [
{
"created": "Wed, 7 May 1997 19:50:07 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Aug 1997 14:27:24 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Brill",
"Dieter R.",
""
],
[
"Louko",
"Jorma",
""
],
[
"Peldan",
"Peter",
""
]
] | We examine counterparts of the Reissner-Nordstrom-anti-de Sitter black hole spacetimes in which the two-sphere has been replaced by a surface Sigma of constant negative or zero curvature. When horizons exist, the spacetimes are black holes with an asymptotically locally anti-de Sitter infinity, but the infinity topolog... |
gr-qc/9704057 | Louis Crane | Louis Crane | A Proposal for the Quantum Theory of Gravity | 11 pages, latex, important addendum | null | null | null | gr-qc | null | We propose a model for the quantum theory of gravity. the model has
diffeomorphism invariance, a natural length scale, and (plausibly) propagating
modes. in the new addendum, we alter the model in a way which makes the
propagating modes much easier to approach.
| [
{
"created": "Mon, 21 Apr 1997 18:52:14 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Apr 1997 20:15:55 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Crane",
"Louis",
""
]
] | We propose a model for the quantum theory of gravity. the model has diffeomorphism invariance, a natural length scale, and (plausibly) propagating modes. in the new addendum, we alter the model in a way which makes the propagating modes much easier to approach. |
1702.03817 | Bo-Qiang Ma | Hefu Yu, Bo-Qiang Ma | Unification of gravity and quantum field theory from extended
noncommutative geometry | 7 latex pages, 0 figure, final version in publication | Mod.Phys.Lett. A32 (2017) 1750030 | 10.1142/S0217732317500304 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make biframe and quaternion extensions on the noncommutative geometry, and
construct the biframe spacetime for the unification of gravity and quantum
field theory. The extended geometry distinguishes between the ordinary
spacetime based on the frame bundle and an extra non-coordinate spacetime based
on the biframe... | [
{
"created": "Thu, 9 Feb 2017 11:36:40 GMT",
"version": "v1"
}
] | 2017-03-13 | [
[
"Yu",
"Hefu",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We make biframe and quaternion extensions on the noncommutative geometry, and construct the biframe spacetime for the unification of gravity and quantum field theory. The extended geometry distinguishes between the ordinary spacetime based on the frame bundle and an extra non-coordinate spacetime based on the biframe b... |
gr-qc/9812088 | Mohammad Nouri-Zonoz | M. Nouri-Zonoz and T. Padmanabhan | The classical essence of black hole radiation | 5 pages, Revtex | null | null | IUCAA-50/98 | gr-qc | null | We show that the mathematics of Hawking process can be interpreted
classically as the Fourier analysis of an exponentially redshifted wave mode
which scatters off the black hole and travels to infinity at late times. We use
this method to derive the Planckian power spectrum for Schwarzchild,
Reissner-Nordstrom and Ke... | [
{
"created": "Mon, 28 Dec 1998 06:10:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nouri-Zonoz",
"M.",
""
],
[
"Padmanabhan",
"T.",
""
]
] | We show that the mathematics of Hawking process can be interpreted classically as the Fourier analysis of an exponentially redshifted wave mode which scatters off the black hole and travels to infinity at late times. We use this method to derive the Planckian power spectrum for Schwarzchild, Reissner-Nordstrom and Kerr... |
2012.04507 | Renata Ferrero | Renata Ferrero and Roberto Percacci | Dynamical diffeomorphisms | null | Class. Quant. Grav. 38 (2021) 11, 115011 | 10.1088/1361-6382/abf627 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a general effective dynamics for diffeomorphisms of spacetime,
in a fixed external metric. Though related to familiar models of scalar fields
as coordinates, our models have subtly different properties, both at
kinematical and dynamical level. The energy-momentum tensor consists of two
independently cons... | [
{
"created": "Tue, 8 Dec 2020 15:46:17 GMT",
"version": "v1"
}
] | 2021-05-12 | [
[
"Ferrero",
"Renata",
""
],
[
"Percacci",
"Roberto",
""
]
] | We construct a general effective dynamics for diffeomorphisms of spacetime, in a fixed external metric. Though related to familiar models of scalar fields as coordinates, our models have subtly different properties, both at kinematical and dynamical level. The energy-momentum tensor consists of two independently conser... |
gr-qc/0201076 | Jose Geraldo Pereira | M. Calcada and J. G. Pereira | Angular Momentum and Energy-Momentum Densities as Gauge Currents | RevTeX4, 7 pages, no figures. Presentation changes; version to appear
in Phys. Rev. D | Phys.Rev. D66 (2002) 044001 | 10.1103/PhysRevD.66.044001 | null | gr-qc hep-th | null | If we replace the general spacetime group of diffeomorphisms by
transformations taking place in the tangent space, general relativity can be
interpreted as a gauge theory, and in particular as a gauge theory for the
Lorentz group. In this context, it is shown that the angular momentum and the
energy-momentum tensors ... | [
{
"created": "Wed, 23 Jan 2002 12:43:26 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Feb 2002 17:08:44 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jul 2002 16:10:16 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Calcada",
"M.",
""
],
[
"Pereira",
"J. G.",
""
]
] | If we replace the general spacetime group of diffeomorphisms by transformations taking place in the tangent space, general relativity can be interpreted as a gauge theory, and in particular as a gauge theory for the Lorentz group. In this context, it is shown that the angular momentum and the energy-momentum tensors of... |
1501.06085 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Gravitational lensing of wormholes in noncommutative geometry | 8 pages, 1 figure | Scientific Voyage, vol. 2, pp. 1-8, (2016) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that a noncommutative-geometry background may be able to
support traversable wormholes. This paper discusses the possible detection of
such wormholes in the outer regions of galactic halos by means of gravitational
lensing. The procedure allows a comparison to other models such as the
Navarro-Frenk-... | [
{
"created": "Sat, 24 Jan 2015 21:43:40 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Jan 2015 20:00:29 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Mar 2015 23:07:54 GMT",
"version": "v3"
},
{
"created": "Wed, 27 Jul 2016 14:27:32 GMT",
"version": "v4"
},
{
"cr... | 2016-08-16 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | It has been shown that a noncommutative-geometry background may be able to support traversable wormholes. This paper discusses the possible detection of such wormholes in the outer regions of galactic halos by means of gravitational lensing. The procedure allows a comparison to other models such as the Navarro-Frenk-Wh... |
gr-qc/0310039 | Claudio Dappiaggi | M. Carfora, C. Dappiaggi, A. Marzuoli | The conformal geometry of Random Regge Triangulations | 42 pages, 12 figures, published on "Advances in General Relativity
and Cosmology" - Edited by Giorgio Ferrarese - Pitagora Editrice | null | null | null | gr-qc hep-th math-ph math.MP | null | We review some of our recent work on the conformal geometry corresponding to
the triangulated surfaces used in 2-dimensional simplicial quantum gravity. In
particular, we discuss the regularized Liouville action associated with random
Regge triangulations and its connection with Hodge-Deligne theory.
| [
{
"created": "Tue, 7 Oct 2003 11:47:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carfora",
"M.",
""
],
[
"Dappiaggi",
"C.",
""
],
[
"Marzuoli",
"A.",
""
]
] | We review some of our recent work on the conformal geometry corresponding to the triangulated surfaces used in 2-dimensional simplicial quantum gravity. In particular, we discuss the regularized Liouville action associated with random Regge triangulations and its connection with Hodge-Deligne theory. |
2107.14744 | Yi-Zen Chu | Yi-Zen Chu | Electromagnetic and Gravitational Radiation in All Dimensions: A
Classical Field Theory Treatment | 30 pages, 4 figures | null | 10.1103/PhysRevD.104.084074 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | How long does a light bulb shine in odd dimensional flat spacetimes,
according to a distant observer? This question is non-trivial because
electromagnetic and gravitational waves, despite being comprised of massless
particles, can develop tails: they travel inside the light cone. To this end, I
attempt to close a gap... | [
{
"created": "Fri, 30 Jul 2021 16:42:51 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Sep 2021 08:37:21 GMT",
"version": "v2"
},
{
"created": "Sun, 10 Oct 2021 09:36:08 GMT",
"version": "v3"
}
] | 2021-11-03 | [
[
"Chu",
"Yi-Zen",
""
]
] | How long does a light bulb shine in odd dimensional flat spacetimes, according to a distant observer? This question is non-trivial because electromagnetic and gravitational waves, despite being comprised of massless particles, can develop tails: they travel inside the light cone. To this end, I attempt to close a gap i... |
gr-qc/0501073 | Jacek Jezierski | Jacek Jezierski, Jerzy Kijowski | Unconstrained degrees of freedom for gravitational waves,
$\beta$--foliations and spherically symmetric initial data | 10 pages | null | null | Preprint ESI 1552 (2004) | gr-qc | null | A new parameterization of unconstrained degrees of freedom for gravitational
field, used in Classical and Quantum Gravity {\bf 11}, 1055-1068 (1994), has
been generalized to one-parameter family of such parameterizations, depending
on a real parameter $\beta \in [0,2]$. The description introduced in CQG 11,
1055 corr... | [
{
"created": "Tue, 25 Jan 2005 12:22:41 GMT",
"version": "v1"
}
] | 2010-10-13 | [
[
"Jezierski",
"Jacek",
""
],
[
"Kijowski",
"Jerzy",
""
]
] | A new parameterization of unconstrained degrees of freedom for gravitational field, used in Classical and Quantum Gravity {\bf 11}, 1055-1068 (1994), has been generalized to one-parameter family of such parameterizations, depending on a real parameter $\beta \in [0,2]$. The description introduced in CQG 11, 1055 corres... |
2103.11340 | Bahram Mashhoon | Carmen Chicone and Bahram Mashhoon | Jacobi Fields and Tidal Effects in Kerr Spacetime | 27 pages, 5 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | General relativistic tidal equations are formulated with respect to the rest
frame of a central gravitational source described by the Kerr gravitational
field. Specifically, observers that are spatially at rest in the exterior Kerr
spacetime are considered in detail; in effect, these fiducial observers define
the res... | [
{
"created": "Sun, 21 Mar 2021 08:42:02 GMT",
"version": "v1"
}
] | 2021-03-23 | [
[
"Chicone",
"Carmen",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | General relativistic tidal equations are formulated with respect to the rest frame of a central gravitational source described by the Kerr gravitational field. Specifically, observers that are spatially at rest in the exterior Kerr spacetime are considered in detail; in effect, these fiducial observers define the rest ... |
gr-qc/0311088 | Marcello Ortaggio | Marcello Ortaggio | Ultrarelativistic black hole in an external electromagnetic field and
gravitational waves in the Melvin universe | 11 pages, REVTeX 4 | Phys.Rev. D69 (2004) 064034 | 10.1103/PhysRevD.69.064034 | null | gr-qc hep-th | null | We investigate the ultrarelativistic boost of a Schwarzschild black hole
immersed in an external electromagnetic field, described by an exact solution
of the Einstein-Maxwell equations found by Ernst (the ``Schwarzschild-Melvin''
metric). Following the classical method of Aichelburg and Sexl, the
gravitational field ... | [
{
"created": "Thu, 27 Nov 2003 12:27:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ortaggio",
"Marcello",
""
]
] | We investigate the ultrarelativistic boost of a Schwarzschild black hole immersed in an external electromagnetic field, described by an exact solution of the Einstein-Maxwell equations found by Ernst (the ``Schwarzschild-Melvin'' metric). Following the classical method of Aichelburg and Sexl, the gravitational field ge... |
1905.03496 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Unification of Inflation with Dark Energy in $f(R)$ Gravity and Axion
Dark Matter | PRD Accepted | Phys. Rev. D 99, 104070 (2019) | 10.1103/PhysRevD.99.104070 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we introduce an effective model of $f(R)$ gravity containing a
non-minimal coupling to the axion scalar field. The axion field is described by
the misalignment model, in which the primordial $U(1)$ Peccei-Quinn symmetry is
broken during inflation and the $f(R)$ gravity is described by the $R^2$ model,
an... | [
{
"created": "Thu, 9 May 2019 09:08:22 GMT",
"version": "v1"
},
{
"created": "Sun, 19 May 2019 16:43:20 GMT",
"version": "v2"
}
] | 2019-06-05 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this work we introduce an effective model of $f(R)$ gravity containing a non-minimal coupling to the axion scalar field. The axion field is described by the misalignment model, in which the primordial $U(1)$ Peccei-Quinn symmetry is broken during inflation and the $f(R)$ gravity is described by the $R^2$ model, and ... |
1512.08639 | Tomohiro Harada | Tomohiro Harada and Sanjay Jhingan | Spherical and nonspherical models of primordial black hole formation:
exact solutions | 28 pages, 5 figures, accepted for publication in Progress of
Theoretical and Experimental Physics | Prog.Theor.Exp.Phys. (2016) 093E04 | 10.1093/ptep/ptw123 | RUP-15-31 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct spacetimes which provide spherical and nonspherical models of
black hole formation in the flat Friedmann--Lemaitre--Robertson--Walker (FLRW)
universe with the Lemaitre--Tolman--Bondi solution and the Szekeres
quasispherical solution, respectively. These dust solutions may contain both
shell-crossing and ... | [
{
"created": "Tue, 29 Dec 2015 09:57:11 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Sep 2016 02:52:29 GMT",
"version": "v2"
}
] | 2016-10-25 | [
[
"Harada",
"Tomohiro",
""
],
[
"Jhingan",
"Sanjay",
""
]
] | We construct spacetimes which provide spherical and nonspherical models of black hole formation in the flat Friedmann--Lemaitre--Robertson--Walker (FLRW) universe with the Lemaitre--Tolman--Bondi solution and the Szekeres quasispherical solution, respectively. These dust solutions may contain both shell-crossing and sh... |
1708.01734 | Junsei Tokuda | Junsei Tokuda, Takahiro Tanaka | Statistical nature of infrared dynamics on de Sitter background | 20 pages plus appendices, 12 figures. v4: matches published version | null | 10.1088/1475-7516/2018/02/014 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we formulate a systematic way of deriving an effective
equation of motion(EoM) for long wavelength modes of a massless scalar field
with a general potential $V(\phi)$ on de Sitter background, and investigate
whether or not the effective EoM can be described as a classical stochastic
process. Our formul... | [
{
"created": "Sat, 5 Aug 2017 08:44:10 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 2017 13:50:30 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Feb 2018 11:27:05 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Feb 2018 10:05:18 GMT",
"version": "v4"
}
] | 2018-02-26 | [
[
"Tokuda",
"Junsei",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | In this study, we formulate a systematic way of deriving an effective equation of motion(EoM) for long wavelength modes of a massless scalar field with a general potential $V(\phi)$ on de Sitter background, and investigate whether or not the effective EoM can be described as a classical stochastic process. Our formulat... |
2207.09271 | Yen Chin Ong | Sofia Di Gennaro, Hao Xu, Yen Chin Ong | How Barrow Entropy Modifies Gravity: With Comments on Tsallis Entropy | 6 pages: added comparisons with the Tsallis entropy case and
discussions on the Bekenstein bound; references updated; version accepted by
EPJC | null | 10.1140/epjc/s10052-022-11040-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Barrow proposed that the area law of the horizon entropy might receive a
"fractal correction" $S\propto A^{1+\Delta/2}$ due to quantum gravitational
effects, with $0\leqslant \Delta \leqslant 1$ measures the deviation from the
standard area law. While such a modification has been widely studied in the
literature, its... | [
{
"created": "Tue, 19 Jul 2022 13:29:55 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2022 15:22:40 GMT",
"version": "v2"
}
] | 2022-12-14 | [
[
"Di Gennaro",
"Sofia",
""
],
[
"Xu",
"Hao",
""
],
[
"Ong",
"Yen Chin",
""
]
] | Barrow proposed that the area law of the horizon entropy might receive a "fractal correction" $S\propto A^{1+\Delta/2}$ due to quantum gravitational effects, with $0\leqslant \Delta \leqslant 1$ measures the deviation from the standard area law. While such a modification has been widely studied in the literature, its c... |
gr-qc/0512164 | Yuri Kubyshin | E. Garcia-Berro, Yu.A. Kubyshin, P. Loren-Aguilar, and J. Isern | The variation of the gravitational constant inferred from the Hubble
diagram of Type Ia supernovae | LaTeX, 12 pages, 3 figs. In the replaced version figures are added
and some errors are corrected | Int.J.Mod.Phys.D15:1163-1174,2006 | 10.1142/S0218271806008772 | null | gr-qc | null | We consider a cosmological model with a variable gravitational constant, G,
based on a scalar-tensor theory. Using the recent observational data for the
Hubble diagram of type Ia supernovae (SNeIa) we find a phenomenological
expression describing the variation of G. The corresponding variation of the
fine structure c... | [
{
"created": "Thu, 29 Dec 2005 20:42:37 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2006 10:39:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Garcia-Berro",
"E.",
""
],
[
"Kubyshin",
"Yu. A.",
""
],
[
"Loren-Aguilar",
"P.",
""
],
[
"Isern",
"J.",
""
]
] | We consider a cosmological model with a variable gravitational constant, G, based on a scalar-tensor theory. Using the recent observational data for the Hubble diagram of type Ia supernovae (SNeIa) we find a phenomenological expression describing the variation of G. The corresponding variation of the fine structure con... |
2402.17815 | Bruno Arderucio Costa | Bruno Arderucio Costa | Is the Page-time paradox paradoxical? | Essay written for the Gravity Research Foundation 2024 Awards for
Essays on Gravitation | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss how five reasonably sounding assumptions lead to a dilemma -- the
Page-time paradox -- , which appears to challenge a conventional statistical
mechanical underpinning of black hole thermodynamics. By inspecting the
conceptual subtleties behind each hypothesis, I list questions that require
clarification bef... | [
{
"created": "Tue, 27 Feb 2024 15:14:23 GMT",
"version": "v1"
}
] | 2024-02-29 | [
[
"Costa",
"Bruno Arderucio",
""
]
] | I discuss how five reasonably sounding assumptions lead to a dilemma -- the Page-time paradox -- , which appears to challenge a conventional statistical mechanical underpinning of black hole thermodynamics. By inspecting the conceptual subtleties behind each hypothesis, I list questions that require clarification befor... |
1911.03554 | Konstantinos Dialektopoulos F. | Francesco Bajardi, Konstantinos F. Dialektopoulos and Salvatore
Capozziello | Higher dimensional static and spherically symmetric solutions in
extended Gauss-Bonnet gravity | 10 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a theory of gravity of the form $f(\mathcal{G})$ where $\mathcal{G}$
is the Gauss-Bonnet topological invariant without considering the standard
Einstein-Hilbert term as common in the literature, in arbitrary $(d+1)$
dimensions. The approach is motivated by the fact that, in particular
conditions, the Ricci c... | [
{
"created": "Fri, 8 Nov 2019 21:41:30 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2020 18:48:49 GMT",
"version": "v2"
}
] | 2020-01-30 | [
[
"Bajardi",
"Francesco",
""
],
[
"Dialektopoulos",
"Konstantinos F.",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We study a theory of gravity of the form $f(\mathcal{G})$ where $\mathcal{G}$ is the Gauss-Bonnet topological invariant without considering the standard Einstein-Hilbert term as common in the literature, in arbitrary $(d+1)$ dimensions. The approach is motivated by the fact that, in particular conditions, the Ricci cur... |
0708.1769 | Piotr Bizon | Piotr Bizo\'n, Tadeusz Chmaj, Andrzej Rostworowski | Anomalously small wave tails in higher dimensions | 13 pages | Phys.Rev.D76:124035,2007 | 10.1103/PhysRevD.76.124035 | null | gr-qc | null | We consider the late-time tails of spherical waves propagating on
even-dimensional Minkowski spacetime under the influence of a long range radial
potential. We show that in six and higher even dimensions there exist
exceptional potentials for which the tail has an anomalously small amplitude
and fast decay. Along the... | [
{
"created": "Mon, 13 Aug 2007 20:18:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bizoń",
"Piotr",
""
],
[
"Chmaj",
"Tadeusz",
""
],
[
"Rostworowski",
"Andrzej",
""
]
] | We consider the late-time tails of spherical waves propagating on even-dimensional Minkowski spacetime under the influence of a long range radial potential. We show that in six and higher even dimensions there exist exceptional potentials for which the tail has an anomalously small amplitude and fast decay. Along the w... |
2401.16466 | Bouzenada Abdelmalek . | Faizuddin Ahmed and Abdelmalek Bouzenada | Quantum motions of scalar particles under rainbow gravity effects in
spherical symmetrical G\"odel-type metric with topological defects | null | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In this research contribution, we explore the relativistic quantum dynamics
of spin-0 scalar particles within a curved space-time background containing
topological defects, while incorporating the effects of rainbow gravity. The
Klein Gordon equation is solved in a spherically symmetrical Godel type space
time, consi... | [
{
"created": "Mon, 29 Jan 2024 18:09:24 GMT",
"version": "v1"
}
] | 2024-01-31 | [
[
"Ahmed",
"Faizuddin",
""
],
[
"Bouzenada",
"Abdelmalek",
""
]
] | In this research contribution, we explore the relativistic quantum dynamics of spin-0 scalar particles within a curved space-time background containing topological defects, while incorporating the effects of rainbow gravity. The Klein Gordon equation is solved in a spherically symmetrical Godel type space time, conside... |
0812.3396 | Dejan Stojkovic | De-Chang Dai and Dejan Stojkovic | Hawking radiation of unparticles | Calculations for different normalization of unparticles included,
discussion expanded, version published in Phys. Rev. D | Phys.Rev.D80:064042,2009 | 10.1103/PhysRevD.80.064042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unparticle degrees of freedom, no matter how weakly coupled to the standard
model particles, must affect the evolution of a black hole, which thermally
decays into all available degrees of freedom. We develop a method for
calculating the grey-body factors for scalar unparticles for 3+1 and higher
dimensional black ho... | [
{
"created": "Wed, 17 Dec 2008 21:01:07 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jun 2009 21:26:49 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Oct 2009 02:50:20 GMT",
"version": "v3"
}
] | 2009-11-06 | [
[
"Dai",
"De-Chang",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | Unparticle degrees of freedom, no matter how weakly coupled to the standard model particles, must affect the evolution of a black hole, which thermally decays into all available degrees of freedom. We develop a method for calculating the grey-body factors for scalar unparticles for 3+1 and higher dimensional black hole... |
gr-qc/0504015 | Steve Drasco | Scott A. Hughes, Steve Drasco, Eanna E. Flanagan, Joel Franklin | Gravitational radiation reaction and inspiral waveforms in the adiabatic
limit | Accepted for publication in Phys. Rev. Lett | Phys.Rev.Lett. 94 (2005) 221101 | 10.1103/PhysRevLett.94.221101 | null | gr-qc astro-ph | null | We describe progress evolving an important limit of binary orbits in general
relativity, that of a stellar mass compact object gradually spiraling into a
much larger, massive black hole. These systems are of great interest for
gravitational wave observations. We have developed tools to compute for the
first time the ... | [
{
"created": "Tue, 5 Apr 2005 14:35:59 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Apr 2005 23:08:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Hughes",
"Scott A.",
""
],
[
"Drasco",
"Steve",
""
],
[
"Flanagan",
"Eanna E.",
""
],
[
"Franklin",
"Joel",
""
]
] | We describe progress evolving an important limit of binary orbits in general relativity, that of a stellar mass compact object gradually spiraling into a much larger, massive black hole. These systems are of great interest for gravitational wave observations. We have developed tools to compute for the first time the ra... |
2210.13372 | Robert J. Scherrer | F\'abio S. Bemfica, Marcelo M. Disconzi, Jorge Noronha, and Robert J.
Scherrer | Cosmological consequences of first-order general-relativistic viscous
fluid dynamics | 14 pages, no figures, references updated, discussion added | Phys. Rev. D, 107, 023512 (2023) | 10.1103/PhysRevD.107.023512 | null | gr-qc astro-ph.CO hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the out-of-equilibrium dynamics of viscous fluids in a
spatially flat Friedmann-Lema\^itre-Robertson-Walker cosmology using the most
general causal and stable viscous energy-momentum tensor defined at first order
in spacetime derivatives. In this new framework a pressureless viscous fluid
having densit... | [
{
"created": "Mon, 24 Oct 2022 16:12:59 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2022 17:47:42 GMT",
"version": "v2"
}
] | 2023-07-31 | [
[
"Bemfica",
"Fábio S.",
""
],
[
"Disconzi",
"Marcelo M.",
""
],
[
"Noronha",
"Jorge",
""
],
[
"Scherrer",
"Robert J.",
""
]
] | We investigate the out-of-equilibrium dynamics of viscous fluids in a spatially flat Friedmann-Lema\^itre-Robertson-Walker cosmology using the most general causal and stable viscous energy-momentum tensor defined at first order in spacetime derivatives. In this new framework a pressureless viscous fluid having density ... |
1511.05955 | Ryan Lynch | Ryan Lynch, Salvatore Vitale, Reed Essick, Erik Katsavounidis, Florent
Robinet | An information-theoretic approach to the gravitational-wave burst
detection problem | null | Phys. Rev. D 95, 104046 (2017) | 10.1103/PhysRevD.95.104046 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observational era of gravitational-wave astronomy began in the Fall of
2015 with the detection of GW150914. One potential type of detectable
gravitational wave is short-duration gravitational-wave bursts, whose waveforms
can be difficult to predict. We present the framework for a new detection
algorithm for such ... | [
{
"created": "Wed, 18 Nov 2015 20:58:02 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2016 23:50:14 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Mar 2017 03:38:29 GMT",
"version": "v3"
}
] | 2017-06-07 | [
[
"Lynch",
"Ryan",
""
],
[
"Vitale",
"Salvatore",
""
],
[
"Essick",
"Reed",
""
],
[
"Katsavounidis",
"Erik",
""
],
[
"Robinet",
"Florent",
""
]
] | The observational era of gravitational-wave astronomy began in the Fall of 2015 with the detection of GW150914. One potential type of detectable gravitational wave is short-duration gravitational-wave bursts, whose waveforms can be difficult to predict. We present the framework for a new detection algorithm for such bu... |
1605.08757 | Frank K\"onnig | Frank K\"onnig (1), Henrik Nersisyan (1), Yashar Akrami (1), Luca
Amendola (1), Miguel Zumalac\'arregui (2 and 1) ((1) ITP Univ. of Heidelberg,
(2) Nordita) | A spectre is haunting the cosmos: Quantum stability of massive gravity
with ghosts | 18 pages, 3 figures, version published in JHEP | Journal of High Energy Physics, 2016(11), 1-26 | 10.1007/JHEP11(2016)118 | NORDITA-2016-53 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many theories of modified gravity with higher order derivatives are usually
ignored because of serious problems that appear due to an additional ghost
degree of freedom. Most dangerously, it causes an immediate decay of the
vacuum. However, breaking Lorentz invariance can cure such abominable behavior.
By analyzing a... | [
{
"created": "Fri, 27 May 2016 19:08:43 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jun 2016 19:48:30 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Oct 2016 09:08:31 GMT",
"version": "v3"
},
{
"created": "Tue, 29 Nov 2016 17:31:59 GMT",
"version": "v4"
}
] | 2016-11-30 | [
[
"Könnig",
"Frank",
"",
"2 and 1"
],
[
"Nersisyan",
"Henrik",
"",
"2 and 1"
],
[
"Akrami",
"Yashar",
"",
"2 and 1"
],
[
"Amendola",
"Luca",
"",
"2 and 1"
],
[
"Zumalacárregui",
"Miguel",
"",
"2 and 1"
]
] | Many theories of modified gravity with higher order derivatives are usually ignored because of serious problems that appear due to an additional ghost degree of freedom. Most dangerously, it causes an immediate decay of the vacuum. However, breaking Lorentz invariance can cure such abominable behavior. By analyzing a m... |
1502.04432 | Lorenzo Sebastiani | Ratbay Myrzakulov, Lorenzo Sebastiani and Sergio Zerbini | Reconstruction of Inflation Models | 14 pages | Eur.Phys.J. C75 (2015) 5, 215 | 10.1140/epjc/s10052-015-3443-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we reconstruct viable inflationary models by starting from
spectral index and tensor-to-scalar ratio from Planck observations. We analyze
three different kinds of models: scalar field theories, fluid cosmology and
f(R)-modified gravity. We recover the well known R^2-inflation in Jodan frame
and Einstei... | [
{
"created": "Mon, 16 Feb 2015 06:17:13 GMT",
"version": "v1"
}
] | 2015-09-21 | [
[
"Myrzakulov",
"Ratbay",
""
],
[
"Sebastiani",
"Lorenzo",
""
],
[
"Zerbini",
"Sergio",
""
]
] | In this paper, we reconstruct viable inflationary models by starting from spectral index and tensor-to-scalar ratio from Planck observations. We analyze three different kinds of models: scalar field theories, fluid cosmology and f(R)-modified gravity. We recover the well known R^2-inflation in Jodan frame and Einstein ... |
1706.08875 | Henrique de Andrade Gomes | Henrique Gomes | Quantum gravity in timeless configuration space | 31 pages, 16 page appendix. New version: added discussion on
refoliation invariance, modifications of the appendices, and added reference | Class.Quant.Grav. 34 (2017) no.23, 235004 | 10.1088/1361-6382/aa8cf9 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the path towards quantum gravity, we find friction between temporal
relations in quantum mechanics (QM) (where they are fixed and
field-independent), and in general relativity (where they are field-dependent
and dynamic). This paper aims to attenuate that friction, by encoding gravity
in the timeless configuration... | [
{
"created": "Fri, 23 Jun 2017 14:28:33 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2017 04:23:13 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Jun 2017 11:14:19 GMT",
"version": "v3"
}
] | 2017-11-28 | [
[
"Gomes",
"Henrique",
""
]
] | On the path towards quantum gravity, we find friction between temporal relations in quantum mechanics (QM) (where they are fixed and field-independent), and in general relativity (where they are field-dependent and dynamic). This paper aims to attenuate that friction, by encoding gravity in the timeless configuration s... |
gr-qc/0602027 | Richard Price | Christopher Beetle, Benjamin Bromley, and Richard H. Price | The periodic standing-wave approximation: eigenspectral computations for
linear gravity and nonlinear toy models | 21 pages, 10 figures, RevTeX | Phys.Rev. D74 (2006) 024013 | 10.1103/PhysRevD.74.024013 | null | gr-qc | null | The periodic standing wave approach to binary inspiral assumes rigid rotation
of gravitational fields and hence helically symmetric solutions. To exploit the
symmetry, numerical computations must solve for ``helical scalars,'' fields
that are functions only of corotating coordinates, the labels on the helical
Killing... | [
{
"created": "Wed, 8 Feb 2006 05:37:13 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Beetle",
"Christopher",
""
],
[
"Bromley",
"Benjamin",
""
],
[
"Price",
"Richard H.",
""
]
] | The periodic standing wave approach to binary inspiral assumes rigid rotation of gravitational fields and hence helically symmetric solutions. To exploit the symmetry, numerical computations must solve for ``helical scalars,'' fields that are functions only of corotating coordinates, the labels on the helical Killing t... |
0710.2335 | P Ajith | P. Ajith, S. Babak, Y. Chen, M. Hewitson, B. Krishnan, A. M. Sintes,
J. T. Whelan, B. Bruegmann, P. Diener, N. Dorband, J. Gonzalez, M. Hannam, S.
Husa, D. Pollney, L. Rezzolla, L. Santamaria, U. Sperhake, J. Thornburg | A template bank for gravitational waveforms from coalescing binary black
holes: non-spinning binaries | A typo fixed in Eq.(B11) | Phys.Rev.D77:104017,2008; Erratum-ibid.D79:129901,2009 | 10.1103/PhysRevD.77.104017 10.1103/PhysRevD.79.129901 | AEI-2007-143, LIGO-P070111-00-Z | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waveforms from the inspiral and ring-down stages of the binary
black hole coalescences can be modelled accurately by
approximation/perturbation techniques in general relativity. Recent progress in
numerical relativity has enabled us to model also the non-perturbative merger
phase of the binary black-hol... | [
{
"created": "Thu, 11 Oct 2007 19:52:02 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Feb 2008 14:12:47 GMT",
"version": "v2"
},
{
"created": "Mon, 11 May 2009 20:33:55 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Ajith",
"P.",
""
],
[
"Babak",
"S.",
""
],
[
"Chen",
"Y.",
""
],
[
"Hewitson",
"M.",
""
],
[
"Krishnan",
"B.",
""
],
[
"Sintes",
"A. M.",
""
],
[
"Whelan",
"J. T.",
""
],
[
"Bruegmann",
"B.",
... | Gravitational waveforms from the inspiral and ring-down stages of the binary black hole coalescences can be modelled accurately by approximation/perturbation techniques in general relativity. Recent progress in numerical relativity has enabled us to model also the non-perturbative merger phase of the binary black-hole ... |
2103.13825 | Isabella Masina | Isabella Masina | Dark matter and dark radiation from evaporating Kerr primordial black
holes | 25 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2012.09867 | null | 10.1134/S0202289321040101 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism of the generation of dark matter and dark radiation from the
evaporation of primordial black holes is very interesting. We consider the case
of Kerr black holes to generalize previous results obtained in the
Schwarzschild case. For dark matter, the results do not change dramatically and
the bounds on wa... | [
{
"created": "Wed, 24 Mar 2021 11:36:46 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Masina",
"Isabella",
""
]
] | The mechanism of the generation of dark matter and dark radiation from the evaporation of primordial black holes is very interesting. We consider the case of Kerr black holes to generalize previous results obtained in the Schwarzschild case. For dark matter, the results do not change dramatically and the bounds on warm... |
gr-qc/0410070 | Alan Coley | A. Coley, R. Milson, V. Pravda and A. Pravdova | Vanishing Scalar Invariant Spacetimes in Higher Dimensions | final version | Class.Quant.Grav.21:5519-5542,2004 | 10.1088/0264-9381/21/23/014 | null | gr-qc hep-th | null | We study manifolds with Lorentzian signature and prove that all scalar
curvature invariants of all orders vanish in a higher-dimensional Lorentzian
spacetime if and only if there exists an aligned non-expanding, non-twisting,
geodesic null direction along which the Riemann tensor has negative boost
order.
| [
{
"created": "Fri, 15 Oct 2004 16:00:28 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 2004 17:07:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Coley",
"A.",
""
],
[
"Milson",
"R.",
""
],
[
"Pravda",
"V.",
""
],
[
"Pravdova",
"A.",
""
]
] | We study manifolds with Lorentzian signature and prove that all scalar curvature invariants of all orders vanish in a higher-dimensional Lorentzian spacetime if and only if there exists an aligned non-expanding, non-twisting, geodesic null direction along which the Riemann tensor has negative boost order. |
1203.3061 | Gilberto Medeiros Kremer | Lucas G. Collodel and Gilberto M. Kremer | Cosmological models with interacting components and mass-varying
neutrinos | 8 pages, 5 figures, to be published in Gravitation and Cosmology | Gravitation and Cosmology, 18, 196-200 (2012) | 10.1134/S0202289312030036 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model for a homogeneous and isotropic spatially flat Universe, composed of
baryons, radiation, neutrinos, dark matter and dark energy is analyzed. We
infer that dark energy (considered to behave as a scalar field) interacts with
dark matter (either by the Wetterich model, or by the Anderson and Carroll
model) and w... | [
{
"created": "Wed, 14 Mar 2012 12:09:20 GMT",
"version": "v1"
}
] | 2013-09-16 | [
[
"Collodel",
"Lucas G.",
""
],
[
"Kremer",
"Gilberto M.",
""
]
] | A model for a homogeneous and isotropic spatially flat Universe, composed of baryons, radiation, neutrinos, dark matter and dark energy is analyzed. We infer that dark energy (considered to behave as a scalar field) interacts with dark matter (either by the Wetterich model, or by the Anderson and Carroll model) and wit... |
gr-qc/9601038 | Fotini | F. G. Markopoulou | Gravitational Constraint Combinations Generate a Lie Algebra | 10 pages, latex, submitted to Classical and Quantum Gravity. Section
3 is expanded and an additional solution provided, minor errors corrected | Class.Quant.Grav. 13 (1996) 2577 | 10.1088/0264-9381/13/9/021 | IMPERIAL/TP/95--96/20 | gr-qc hep-th | null | We find a first--order partial differential equation whose solutions are all
ultralocal scalar combinations of gravitational constraints with Abelian
Poisson brackets between themselves. This is a generalisation of the Kucha\v{r}
idea of finding alternative constraints for canonical gravity. The new scalars
may be us... | [
{
"created": "Tue, 23 Jan 1996 16:59:11 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 1996 18:41:44 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Markopoulou",
"F. G.",
""
]
] | We find a first--order partial differential equation whose solutions are all ultralocal scalar combinations of gravitational constraints with Abelian Poisson brackets between themselves. This is a generalisation of the Kucha\v{r} idea of finding alternative constraints for canonical gravity. The new scalars may be used... |
1105.2330 | Wolfgang Wieland | Wolfgang Wieland | Complex Ashtekar variables, the Kodama state and spinfoam gravity | 30 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from a Hamiltonian description of four dimensional general
relativity in presence of a cosmological constant we perform the program of
canonical quantisation. This is done using complex Ashtekar variables while
keeping the Barbero--Immirzi parameter real. Introducing the SL(2,C) Kodama
state formally solving... | [
{
"created": "Wed, 11 May 2011 22:13:40 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2011 20:26:26 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Wieland",
"Wolfgang",
""
]
] | Starting from a Hamiltonian description of four dimensional general relativity in presence of a cosmological constant we perform the program of canonical quantisation. This is done using complex Ashtekar variables while keeping the Barbero--Immirzi parameter real. Introducing the SL(2,C) Kodama state formally solving a... |
2406.07128 | David Katona | Alex Colling, David Katona, James Lucietti | Rigidity of the extremal Kerr-Newman horizon | 7 pages | null | null | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the intrinsic geometry of compact cross-sections of an extremal
horizon in four-dimensional Einstein-Maxwell theory must admit a Killing vector
field or is static. This implies that any such horizon must be an extremal
Kerr-Newman horizon and completes the classification of the associated
near-horizon g... | [
{
"created": "Tue, 11 Jun 2024 10:23:11 GMT",
"version": "v1"
}
] | 2024-06-12 | [
[
"Colling",
"Alex",
""
],
[
"Katona",
"David",
""
],
[
"Lucietti",
"James",
""
]
] | We prove that the intrinsic geometry of compact cross-sections of an extremal horizon in four-dimensional Einstein-Maxwell theory must admit a Killing vector field or is static. This implies that any such horizon must be an extremal Kerr-Newman horizon and completes the classification of the associated near-horizon geo... |
1006.1761 | Betti Hartmann | Eva Hackmann, Betti Hartmann, Claus Laemmerzahl, and Parinya
Sirimachan | Test particle motion in the space-time of a Kerr black hole pierced by a
cosmic string | 25 pages including 14 figures | Phys.Rev.D82:044024,2010 | 10.1103/PhysRevD.82.044024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the geodesic equation in the space-time of a Kerr black hole pierced
by an infinitely thin cosmic string and give the complete set of analytical
solutions of this equation for massive and massless particles in terms of Mino
time that allows to decouple the r- and theta-component of the geodesic
equation. The... | [
{
"created": "Wed, 9 Jun 2010 10:28:39 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Hackmann",
"Eva",
""
],
[
"Hartmann",
"Betti",
""
],
[
"Laemmerzahl",
"Claus",
""
],
[
"Sirimachan",
"Parinya",
""
]
] | We study the geodesic equation in the space-time of a Kerr black hole pierced by an infinitely thin cosmic string and give the complete set of analytical solutions of this equation for massive and massless particles in terms of Mino time that allows to decouple the r- and theta-component of the geodesic equation. The s... |
gr-qc/0611017 | Nikolai V. Mitskievich | Nikolai V. Mitskievich | Relativistic generalization of the inertial and gravitational masses
equivalence principle | 5 pages, a talk delivered at the 11th Marcel Grossmann Meeting
(Session GT4), Berlin, 2006 | null | null | null | gr-qc | null | The Newtonian approximation for the gravitational field equation should not
necessarily involve admission of non-relativistic properties of the source
terms in Einstein's equations: it is sufficient to merely consider the
weak-field condition for gravitational field. When a source has electromagnetic
nature, one simp... | [
{
"created": "Fri, 3 Nov 2006 01:58:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mitskievich",
"Nikolai V.",
""
]
] | The Newtonian approximation for the gravitational field equation should not necessarily involve admission of non-relativistic properties of the source terms in Einstein's equations: it is sufficient to merely consider the weak-field condition for gravitational field. When a source has electromagnetic nature, one simply... |
1812.05493 | Andronikos Paliathanasis | Supriya Pan, John D. Barrow and Andronikos Paliathanasis | Two-fluid solutions of particle-creation cosmologies | 10 pages, 2 figures, extension of arXiv:1610.02893, accepted version
for publication by EPJC | null | 10.1140/epjc/s10052-019-6627-5 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological evolution driven incorporating continuous particle creation by
the time-varying gravitational field is investigated. We consider a spatially
flat, homogeneous and isotropic universe with two matter fluids in the context
of general relativity. One fluid is endowed with gravitationally induced
`adiabatic' ... | [
{
"created": "Thu, 13 Dec 2018 15:59:51 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jan 2019 02:17:41 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Pan",
"Supriya",
""
],
[
"Barrow",
"John D.",
""
],
[
"Paliathanasis",
"Andronikos",
""
]
] | Cosmological evolution driven incorporating continuous particle creation by the time-varying gravitational field is investigated. We consider a spatially flat, homogeneous and isotropic universe with two matter fluids in the context of general relativity. One fluid is endowed with gravitationally induced `adiabatic' pa... |
2406.14291 | Viktor Skoup\'y | Viktor Skoup\'y and Vojt\v{e}ch Witzany | Post-Newtonian expansions of extreme mass ratio inspirals of spinning
bodies into Schwarzschild black holes | 22 pages, 8 figures | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Space-based gravitational-wave detectors such as LISA are expected to detect
inspirals of stellar-mass compact objects into massive black holes. Modeling
such inspirals requires fully relativistic computations to achieve sufficient
accuracy at leading order. However, subleading corrections such as the effects
of the ... | [
{
"created": "Thu, 20 Jun 2024 13:16:26 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Skoupý",
"Viktor",
""
],
[
"Witzany",
"Vojtěch",
""
]
] | Space-based gravitational-wave detectors such as LISA are expected to detect inspirals of stellar-mass compact objects into massive black holes. Modeling such inspirals requires fully relativistic computations to achieve sufficient accuracy at leading order. However, subleading corrections such as the effects of the sp... |
gr-qc/9403033 | Clifford M. Will | Clifford M. WILL | Gravitational Waves from Inspiralling Compact Binaries: A Post-Newtonian
Approach | 16 pages, WUGRAV-94-3 | null | null | null | gr-qc | null | Inspiralling binary systems of neutron stars or black holes are promising
sources of gravitational radiation detectable by large-scale laser
interferometric gravitational observatories, such as the US LIGO and
Italian-French VIRGO projects. Accurate theoretical gravitational-waveform
templates will be needed to carry... | [
{
"created": "Thu, 17 Mar 1994 21:46:13 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"WILL",
"Clifford M.",
""
]
] | Inspiralling binary systems of neutron stars or black holes are promising sources of gravitational radiation detectable by large-scale laser interferometric gravitational observatories, such as the US LIGO and Italian-French VIRGO projects. Accurate theoretical gravitational-waveform templates will be needed to carry o... |
2004.07536 | Tomi Koivisto | Jose Beltran Jimenez, Alexey Golovnev, Tomi Koivisto, Hardi Veermae | Minkowski space in $f(T)$ gravity | 5 pages. v2: metadata corrected, conclusion slightly sharpened | Phys. Rev. D 103, 024054 (2021) | 10.1103/PhysRevD.103.024054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The full set of solutions of $f(T)$ gravity with the Minkowski metric is
considered in this note. At the 4-th order in perturbations around the trivial
tetrad solution, a new mode is found explicitly. Its presence signals a strong
coupling problem that transcends the Minkowski background and also suggests the
patholo... | [
{
"created": "Thu, 16 Apr 2020 08:57:14 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Apr 2020 01:53:37 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Jimenez",
"Jose Beltran",
""
],
[
"Golovnev",
"Alexey",
""
],
[
"Koivisto",
"Tomi",
""
],
[
"Veermae",
"Hardi",
""
]
] | The full set of solutions of $f(T)$ gravity with the Minkowski metric is considered in this note. At the 4-th order in perturbations around the trivial tetrad solution, a new mode is found explicitly. Its presence signals a strong coupling problem that transcends the Minkowski background and also suggests the pathologi... |
1912.03499 | Theocharis Apostolatos | Areti Eleni and Theocharis A. Apostolatos | A Newtonian analogue of Kerr black hole | 64 pages, 13 figures | Phys. Rev. D 101, 044056 (2020) | 10.1103/PhysRevD.101.044056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A 250-year old Newtonian problem, first studied by Euler, turns out to share
a lot of similarities with the most extreme astrophysical relativistic object,
the Kerr black hole. Although the framework behind the two fields is completely
different, both problems are related to gravitational fields that have quite
intri... | [
{
"created": "Sat, 7 Dec 2019 13:18:56 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Dec 2019 10:19:24 GMT",
"version": "v2"
}
] | 2020-03-04 | [
[
"Eleni",
"Areti",
""
],
[
"Apostolatos",
"Theocharis A.",
""
]
] | A 250-year old Newtonian problem, first studied by Euler, turns out to share a lot of similarities with the most extreme astrophysical relativistic object, the Kerr black hole. Although the framework behind the two fields is completely different, both problems are related to gravitational fields that have quite intrigu... |
2304.02691 | Pietropaolo Frisoni | Pietropaolo Frisoni | Numerical approach to the black-to-white hole transition | 13 pages, 6 figures. Second version matching the published one | Phys. Rev. D 107, 126012 (2023) | 10.1103/PhysRevD.107.126012 | null | gr-qc physics.comp-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | We outline an algorithm to compute numerically the black-to-white hole
transition amplitude, using the loop quantum gravity covariant formulation and
the Lorentzian Engle-Pereira-Rovelli-Livine model. We apply the algorithm to
calculate the crossing time of the transition in the deep quantum regime,
comparing our res... | [
{
"created": "Wed, 5 Apr 2023 18:41:29 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2023 18:30:47 GMT",
"version": "v2"
}
] | 2023-06-19 | [
[
"Frisoni",
"Pietropaolo",
""
]
] | We outline an algorithm to compute numerically the black-to-white hole transition amplitude, using the loop quantum gravity covariant formulation and the Lorentzian Engle-Pereira-Rovelli-Livine model. We apply the algorithm to calculate the crossing time of the transition in the deep quantum regime, comparing our resul... |
1507.01556 | Philipp Roser | Philipp Roser | Quantum mechanics on York slices | 15 pages | Class. Quantum Grav. 33, 2016, 065001 | 10.1088/0264-9381/33/6/065001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For some time the York time parameter has been identified as a candidate for
a physically meaningful time in cosmology. An associated Hamiltonian may be
found by solving the Hamiltonian constraint for the momentum conjugate to the
York time variable, although an explicit solution can only be found in highly
symmetric... | [
{
"created": "Mon, 6 Jul 2015 18:28:46 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 2015 18:28:02 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Roser",
"Philipp",
""
]
] | For some time the York time parameter has been identified as a candidate for a physically meaningful time in cosmology. An associated Hamiltonian may be found by solving the Hamiltonian constraint for the momentum conjugate to the York time variable, although an explicit solution can only be found in highly symmetric c... |
gr-qc/0311008 | Lorenzo Iorio | Lorenzo Iorio | Some comments on a recently derived approximated solution of the
Einstein equations for a spinning body with negligible mass | Latex2e, 17 pages, no tables, 5 figures, minor typos corrected. To
appear in general Relativity and Gravitation | Gen.Rel.Grav. 36 (2004) 1987-2003 | 10.1023/B:GERG.0000038466.94639.d6 | null | gr-qc | null | Recently, an approximated solution of the Einstein equations for a rotating
body whose mass effects are negligible with respect to the rotational ones has
been derived by Tartaglia. At first sight, it seems to be interesting because
both external and internal metric tensors have been consistently found,
together an a... | [
{
"created": "Mon, 3 Nov 2003 21:24:06 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2004 00:05:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | Recently, an approximated solution of the Einstein equations for a rotating body whose mass effects are negligible with respect to the rotational ones has been derived by Tartaglia. At first sight, it seems to be interesting because both external and internal metric tensors have been consistently found, together an app... |
2009.07996 | Alexander Gu{\ss}mann | Alexander Gu{\ss}mann | Scattering of axial gravitational wave pulses by monopole black holes
and QNMs | 31 pages, 3 figures, v2: typos corrected, references added, refined
QNM calculation added | Class. Quantum Grav. 38 (2021) 035008 | 10.1088/1361-6382/abce46 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scattering of short Gaussian pulses of axial gravitational waves by
a black hole that has swallowed one or more global monopoles. We show how the
response of the black hole to the impinging pulses depends both on the number
of monopoles the black hole has swallowed and on the symmetry breaking scale of
the m... | [
{
"created": "Thu, 17 Sep 2020 01:02:14 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Nov 2020 05:03:30 GMT",
"version": "v2"
}
] | 2020-12-25 | [
[
"Gußmann",
"Alexander",
""
]
] | We study scattering of short Gaussian pulses of axial gravitational waves by a black hole that has swallowed one or more global monopoles. We show how the response of the black hole to the impinging pulses depends both on the number of monopoles the black hole has swallowed and on the symmetry breaking scale of the mod... |
2310.20040 | Koushik Chatterjee | Koushik Chatterjee, Prashant Kocherlakota, Ziri Younsi and Ramesh
Narayan | Energy Extraction from Spinning Stringy Black Holes | To be submitted to journal. Comments are welcome | null | null | null | gr-qc astro-ph.GA astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We perform the first numerical simulations modeling the inflow and outflow of
magnetized plasma in the Kerr-Sen spacetime, which describes classical spinning
black holes (BHs) in string theory. We find that the Blandford-Znajek (BZ)
mechanism, which is believed to power astrophysical relativistic outflows or
``jets''... | [
{
"created": "Mon, 30 Oct 2023 21:51:14 GMT",
"version": "v1"
}
] | 2023-11-01 | [
[
"Chatterjee",
"Koushik",
""
],
[
"Kocherlakota",
"Prashant",
""
],
[
"Younsi",
"Ziri",
""
],
[
"Narayan",
"Ramesh",
""
]
] | We perform the first numerical simulations modeling the inflow and outflow of magnetized plasma in the Kerr-Sen spacetime, which describes classical spinning black holes (BHs) in string theory. We find that the Blandford-Znajek (BZ) mechanism, which is believed to power astrophysical relativistic outflows or ``jets'', ... |
gr-qc/0512161 | Yun-Song Piao | Yun-Song Piao | Scalar Perturbation Spectra in an Emergent Cosmological Island | 5 pages, 1 eps figure, typos corrected, more comments and
clarifications are added according to the suggestions of referees, to publish
in PRD | Phys.Rev. D74 (2006) 043509 | 10.1103/PhysRevD.74.043509 | null | gr-qc hep-ph hep-th | null | The possibility that the universe may have a fundamental and positive
cosmological constant has motivated an interesting cosmological model, in which
initially the universe is in a cosmological constant sea, then the local
quantum fluctuations violating the null energy condition create some islands
with matter and ra... | [
{
"created": "Thu, 29 Dec 2005 03:55:06 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2006 07:26:40 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Piao",
"Yun-Song",
""
]
] | The possibility that the universe may have a fundamental and positive cosmological constant has motivated an interesting cosmological model, in which initially the universe is in a cosmological constant sea, then the local quantum fluctuations violating the null energy condition create some islands with matter and radi... |
1710.08666 | Andronikos Paliathanasis | Andronikos Paliathanasis | Dust fluid component from Lie symmetries in Scalar field Cosmology | 3 pages, to appear in MPLA | Mod. Phys. Lett. A, 32, 1750206 (2017) | 10.1142/S0217732317502066 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in scalar-field cosmology, a dust fluid follows as quantum
corrections from solutions of the Wheeler-DeWitt equation generated by Lie
symmetries. The energy density of the dust fluid is related with the frequency
of the wavefunction.
| [
{
"created": "Tue, 24 Oct 2017 09:17:54 GMT",
"version": "v1"
}
] | 2017-12-21 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We show that in scalar-field cosmology, a dust fluid follows as quantum corrections from solutions of the Wheeler-DeWitt equation generated by Lie symmetries. The energy density of the dust fluid is related with the frequency of the wavefunction. |
1811.07431 | R. K. L. Lo | R. K. L. Lo, T. G. F. Li, A. J. Weinstein | Template-based Gravitational-Wave Echoes Search Using Bayesian Model
Selection | 16 pages, 6 figures | Phys. Rev. D 99, 084052 (2019) | 10.1103/PhysRevD.99.084052 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The ringdown of the gravitational-wave signal from a merger of two black
holes has been suggested as a probe of the structure of the remnant compact
object, which may be more exotic than a black hole. It has been pointed out
that there will be a train of echoes in the late-time ringdown stage for
different types of e... | [
{
"created": "Mon, 19 Nov 2018 00:21:15 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2019 02:21:26 GMT",
"version": "v2"
}
] | 2019-06-05 | [
[
"Lo",
"R. K. L.",
""
],
[
"Li",
"T. G. F.",
""
],
[
"Weinstein",
"A. J.",
""
]
] | The ringdown of the gravitational-wave signal from a merger of two black holes has been suggested as a probe of the structure of the remnant compact object, which may be more exotic than a black hole. It has been pointed out that there will be a train of echoes in the late-time ringdown stage for different types of exo... |
gr-qc/9505019 | null | M. Tsuda, T. Shirafuji and H.-j. Xie | General considerations of matter coupling with the self-dual connection | 16 pages, latex | Class.Quant.Grav. 12 (1995) 3067-3076 | 10.1088/0264-9381/12/12/021 | STUPP-95-139 | gr-qc | null | It has been shown for low-spin fields that the use of only the self-dual part
of the connection as basic variable does not lead to extra conditions or
inconsistencies. We study whether this is true for more general chiral action.
We generalize the chiral gravitational action, and assume that half-integer
spin fields ... | [
{
"created": "Tue, 16 May 1995 06:10:04 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Tsuda",
"M.",
""
],
[
"Shirafuji",
"T.",
""
],
[
"Xie",
"H. -j.",
""
]
] | It has been shown for low-spin fields that the use of only the self-dual part of the connection as basic variable does not lead to extra conditions or inconsistencies. We study whether this is true for more general chiral action. We generalize the chiral gravitational action, and assume that half-integer spin fields ar... |
gr-qc/9704024 | Thomas Baumgarte | T. W. Baumgarte, G. B. Cook, M. A. Scheel, S. L. Shapiro and S. A.
Teukolsky | Binary Neutron Stars in General Relativity: Quasi-Equilibrium Models | 4 pages, 3 figures, RevTeX | Phys.Rev.Lett. 79 (1997) 1182-1185 | 10.1103/PhysRevLett.79.1182 | null | gr-qc astro-ph | null | We perform fully relativistic calculations of binary neutron stars in
quasi-equilibrium circular orbits. We integrate Einstein's equations together
with the relativistic equation of hydrostatic equilibrium to solve the initial
value problem for equal-mass binaries of arbitrary separation. We construct
sequences of co... | [
{
"created": "Tue, 8 Apr 1997 15:51:52 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Baumgarte",
"T. W.",
""
],
[
"Cook",
"G. B.",
""
],
[
"Scheel",
"M. A.",
""
],
[
"Shapiro",
"S. L.",
""
],
[
"Teukolsky",
"S. A.",
""
]
] | We perform fully relativistic calculations of binary neutron stars in quasi-equilibrium circular orbits. We integrate Einstein's equations together with the relativistic equation of hydrostatic equilibrium to solve the initial value problem for equal-mass binaries of arbitrary separation. We construct sequences of cons... |
2303.12471 | Eugen Radu | Burkhard Kleihaus, Jutta Kunz and Eugen Radu | Phases of rotating black objects in d = 5 Einstein-Gauss-Bonnet theory | 14 pages, 2 figures; accepted for publication in Universe (Special
Issue "Black Holes in Einstein-Gauss-Bonnet Theories") | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider several different classes of asymptotically flat, rotating black
objects in d = 5 Einstein-Gauss-Bonnet (EGB) theory. These are first the black
holes with two equal-magnitude angular momenta, in which case extremal
configurations are studied as well. Numerical evidence is also given for the
existence of E... | [
{
"created": "Wed, 22 Mar 2023 11:32:56 GMT",
"version": "v1"
}
] | 2023-03-23 | [
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Radu",
"Eugen",
""
]
] | We consider several different classes of asymptotically flat, rotating black objects in d = 5 Einstein-Gauss-Bonnet (EGB) theory. These are first the black holes with two equal-magnitude angular momenta, in which case extremal configurations are studied as well. Numerical evidence is also given for the existence of EGB... |
gr-qc/0304075 | Sushant G. Ghosh | S.G. Ghosh, and D.W. Deshkar | Gravitational Collapse of Perfect Fluid in Self-Similar Higher
Dimensional Space-Times | 11 Pages, Latex, no figures, Accepted in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D12 (2003) 913-924 | 10.1142/S021827180300344X | null | gr-qc | null | We investigate the occurrence and nature of naked singularities in the
gravitational collapse of an adiabatic perfect fluid in self-similar higher
dimensional space-times. It is shown that strong curvature naked singularities
could occur if the weak energy condition holds. Its implication for cosmic
censorship conjec... | [
{
"created": "Tue, 22 Apr 2003 07:12:13 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ghosh",
"S. G.",
""
],
[
"Deshkar",
"D. W.",
""
]
] | We investigate the occurrence and nature of naked singularities in the gravitational collapse of an adiabatic perfect fluid in self-similar higher dimensional space-times. It is shown that strong curvature naked singularities could occur if the weak energy condition holds. Its implication for cosmic censorship conjectu... |
gr-qc/0305082 | Alejandro Corichi | Abhay Ashtekar and Alejandro Corichi | Non-minimal couplings, quantum geometry and black hole entropy | 14 pages, no figures, revtex4. Section III expanded and typos
corrected | Class.Quant.Grav. 20 (2003) 4473-4484 | 10.1088/0264-9381/20/20/310 | CGPG-03-05/4, ICN-UNAM-03-06 | gr-qc hep-th | null | The black hole entropy calculation for type I isolated horizons, based on
loop quantum gravity, is extended to include non-minimally coupled scalar
fields. Although the non-minimal coupling significantly modifies quantum
geometry, the highly non-trivial consistency checks for the emergence of a
coherent description o... | [
{
"created": "Wed, 21 May 2003 18:53:02 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Aug 2003 18:08:44 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Corichi",
"Alejandro",
""
]
] | The black hole entropy calculation for type I isolated horizons, based on loop quantum gravity, is extended to include non-minimally coupled scalar fields. Although the non-minimal coupling significantly modifies quantum geometry, the highly non-trivial consistency checks for the emergence of a coherent description of ... |
1409.8273 | Giuseppe Congedo | Giuseppe Congedo | Measuring test mass acceleration noise in space-based gravitational wave
astronomy | 10 pages, 3 figures, 1 table | Phys. Rev. D 91, 062006 (2015) | 10.1103/PhysRevD.91.062006 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The basic constituent of interferometric gravitational wave detectors -- the
test mass to test mass interferometric link -- behaves as a differential
dynamometer measuring effective differential forces, comprising an integrated
measure of gravity curvature, inertial effects, as well as non-gravitational
spurious forc... | [
{
"created": "Mon, 29 Sep 2014 19:59:49 GMT",
"version": "v1"
}
] | 2015-03-24 | [
[
"Congedo",
"Giuseppe",
""
]
] | The basic constituent of interferometric gravitational wave detectors -- the test mass to test mass interferometric link -- behaves as a differential dynamometer measuring effective differential forces, comprising an integrated measure of gravity curvature, inertial effects, as well as non-gravitational spurious forces... |
0909.0287 | Emanuele Berti | Paolo Pani, Emanuele Berti, Vitor Cardoso, Yanbei Chen, Richard Norte | Gravitational wave signatures of the absence of an event horizon. I.
Nonradial oscillations of a thin-shell gravastar | 19 pages, 8 figures. In press in Physical Review D. We found a new
family of modes and improved the discussion of nonradial instability | Phys.Rev.D80:124047,2009 | 10.1103/PhysRevD.80.124047 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from compact objects provide information about their
structure, probing deep into strong-gravity regions. Here we illustrate how the
presence or absence of an event horizon can produce qualitative differences in
the gravitational waves emitted by ultra-compact objects. In order to set up a
straw-m... | [
{
"created": "Tue, 1 Sep 2009 22:18:29 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 2009 20:16:40 GMT",
"version": "v2"
}
] | 2010-01-07 | [
[
"Pani",
"Paolo",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Norte",
"Richard",
""
]
] | Gravitational waves from compact objects provide information about their structure, probing deep into strong-gravity regions. Here we illustrate how the presence or absence of an event horizon can produce qualitative differences in the gravitational waves emitted by ultra-compact objects. In order to set up a straw-man... |
1509.05728 | Marco de Cesare | Marco de Cesare, Maria Vittoria Gargiulo, Mairi Sakellariadou | Semiclassical solutions of generalized Wheeler-DeWitt cosmology | 18 pages, 5 figures | Phys. Rev. D 93, 024046 (2016) | 10.1103/PhysRevD.93.024046 | KCL-PH-TH/2015-40 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an extension of WDW minisuperpace cosmology with additional
interaction terms that preserve the linear structure of the theory. General
perturbative methods are developed and applied to known semiclassical solutions
for a closed Universe filled with a massless scalar. The exact Feynman
propagator of the f... | [
{
"created": "Fri, 18 Sep 2015 17:44:51 GMT",
"version": "v1"
}
] | 2016-02-03 | [
[
"de Cesare",
"Marco",
""
],
[
"Gargiulo",
"Maria Vittoria",
""
],
[
"Sakellariadou",
"Mairi",
""
]
] | We consider an extension of WDW minisuperpace cosmology with additional interaction terms that preserve the linear structure of the theory. General perturbative methods are developed and applied to known semiclassical solutions for a closed Universe filled with a massless scalar. The exact Feynman propagator of the fre... |
1905.12426 | Calin Galeriu | Calin Galeriu | Electric charge in hyperbolic motion: the special conformal
transformation solution | 14 pages, 2 figures | European Journal of Physics 40 (6), 2019, 065203 (13pp) | 10.1088/1361-6404/ab3df6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a simple application of special conformal transformations, we derive the
electromagnetic field produced by an electric charge in hyperbolic motion.
Unlike other purely algebraic derivations, here we develop a more intuitive
geometrical description, based on Minkowski diagrams.
| [
{
"created": "Mon, 27 May 2019 19:03:30 GMT",
"version": "v1"
}
] | 2021-03-09 | [
[
"Galeriu",
"Calin",
""
]
] | As a simple application of special conformal transformations, we derive the electromagnetic field produced by an electric charge in hyperbolic motion. Unlike other purely algebraic derivations, here we develop a more intuitive geometrical description, based on Minkowski diagrams. |
1512.05743 | Edward Wilson-Ewing | Edward Wilson-Ewing | Separate universes in loop quantum cosmology: framework and applications | 13 pages, v2: Title changed, clarifications and references added.
Prepared for submission to IJMPD special issue on Loop Quantum Cosmology | Int.J.Mod.Phys.D25(2016)1642002 | 10.1142/S0218271816420025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a streamlined review of how the separate universe approach to
cosmological perturbation theory can be used to study the dynamics of
long-wavelength scalar perturbations in loop quantum cosmology, and then use it
to calculate how long-wavelength curvature perturbations evolve across the loop
quantum cosmolog... | [
{
"created": "Thu, 17 Dec 2015 19:54:20 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Apr 2016 12:01:51 GMT",
"version": "v2"
}
] | 2016-08-03 | [
[
"Wilson-Ewing",
"Edward",
""
]
] | I present a streamlined review of how the separate universe approach to cosmological perturbation theory can be used to study the dynamics of long-wavelength scalar perturbations in loop quantum cosmology, and then use it to calculate how long-wavelength curvature perturbations evolve across the loop quantum cosmology ... |
2003.03198 | Youngsub Yoon | Youngsub Yoon | Comment on "Inconsistencies in Verlinde's emergent gravity" | 6+1 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2016, Erik Verlinde proposed a new theory of gravity called "emergent
gravity" by using mathematical formulas used in the theory of elasticity. In
2017, De-Chang Dai and Dejan Stojkovic claimed to point out inconsistencies in
Verlinde's emergent gravity. We point out that their claim was based on
misunderstanding ... | [
{
"created": "Thu, 5 Mar 2020 15:47:58 GMT",
"version": "v1"
}
] | 2020-03-09 | [
[
"Yoon",
"Youngsub",
""
]
] | In 2016, Erik Verlinde proposed a new theory of gravity called "emergent gravity" by using mathematical formulas used in the theory of elasticity. In 2017, De-Chang Dai and Dejan Stojkovic claimed to point out inconsistencies in Verlinde's emergent gravity. We point out that their claim was based on misunderstanding of... |
2106.16142 | Katelyn Wagner | Katelyn J. Wagner, John T. Whelan, Jared K. Wofford, Karl Wette | Template Lattices for a Cross-Correlation Search for Gravitational Waves
from Scorpius X-1 | 21 pages, 8 figures | Class. Quantum Grav. 39 (2022) 075013 | 10.1088/1361-6382/ac5012 | LIGO P2000502 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the application of the lattice covering problem to the placement
of templates in a search for continuous gravitational waves from the low-mass
X-Ray binary Scorpius X-1. Efficient placement of templates to cover the
parameter space at a given maximum mismatch is an application of the sphere
covering probl... | [
{
"created": "Wed, 30 Jun 2021 15:48:08 GMT",
"version": "v1"
}
] | 2022-06-14 | [
[
"Wagner",
"Katelyn J.",
""
],
[
"Whelan",
"John T.",
""
],
[
"Wofford",
"Jared K.",
""
],
[
"Wette",
"Karl",
""
]
] | We describe the application of the lattice covering problem to the placement of templates in a search for continuous gravitational waves from the low-mass X-Ray binary Scorpius X-1. Efficient placement of templates to cover the parameter space at a given maximum mismatch is an application of the sphere covering problem... |
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