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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0610137 | Arkady A. Popov | A. A. Popov, R. K. Muharlyamov | Local spherically symmetric perturbations of spatially flat Friedmann
models | iopart, 10 pages | null | null | KGPU-06-1 | gr-qc astro-ph | null | The spherically symmetric perturbations in the spatially flat Friedman models
are considered. It is assumed that the Friedmannian density and pressure are
related through a linear equation of state. The perturbation is joined smoothly
with an unperturbed Friedmann's background at the sound horizon of
perturbation. Su... | [
{
"created": "Fri, 27 Oct 2006 08:23:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Popov",
"A. A.",
""
],
[
"Muharlyamov",
"R. K.",
""
]
] | The spherically symmetric perturbations in the spatially flat Friedman models are considered. It is assumed that the Friedmannian density and pressure are related through a linear equation of state. The perturbation is joined smoothly with an unperturbed Friedmann's background at the sound horizon of perturbation. Such... |
2404.11723 | Sourav Chowdhury Roy | Sourav Roy Chowdhury, Debabrata Deb, Farook Rahaman, Saibal Ray | Finslerian extension of an anisotropic strange star in the domain of
modified gravity | Accepted for publication in EPJC | null | null | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | In this article, we apply the Finsler spacetime to develop the Einstein field
equations in the extension of modified geometry. Following Finsler geometry,
which is focused on the tangent bundle with a scalar function, a scalar
equation should be the field equation that defines this structure. This
spacetime maintains... | [
{
"created": "Wed, 17 Apr 2024 20:20:40 GMT",
"version": "v1"
}
] | 2024-04-19 | [
[
"Chowdhury",
"Sourav Roy",
""
],
[
"Deb",
"Debabrata",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Ray",
"Saibal",
""
]
] | In this article, we apply the Finsler spacetime to develop the Einstein field equations in the extension of modified geometry. Following Finsler geometry, which is focused on the tangent bundle with a scalar function, a scalar equation should be the field equation that defines this structure. This spacetime maintains t... |
2309.14925 | Donato Bini | Donato Bini, Thibault Damour, Andrea Geralico | Comparing One-loop Gravitational Bremsstrahlung Amplitudes to the
Multipolar-Post-Minkowskian Waveform | 23 pages, 2 figures; V2: new Sec. 9 and new references added, minor
text modifications; V3: corrected Eqs 8.11, 8.12, 8.13 (and consequently Eq.
9.14), one reference added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare recent one-loop-level, scattering-amplitude-based, computations of
the classical part of the gravitational bremsstrahlung waveform to the
frequency-domain version of the corresponding
Multipolar-Post-Minkowskian waveform result. When referring the one-loop
result to the classical averaged momenta $\bar p... | [
{
"created": "Tue, 26 Sep 2023 13:34:04 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2023 14:18:45 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Feb 2024 16:18:44 GMT",
"version": "v3"
}
] | 2024-02-06 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Geralico",
"Andrea",
""
]
] | We compare recent one-loop-level, scattering-amplitude-based, computations of the classical part of the gravitational bremsstrahlung waveform to the frequency-domain version of the corresponding Multipolar-Post-Minkowskian waveform result. When referring the one-loop result to the classical averaged momenta $\bar p_a =... |
1707.00667 | Simone Speziale | Elena De Paoli and Simone Speziale | Sachs' free data in real connection variables | 23 pages + Appendix, 2 figures. v2: Improved text and some amendments
throughout, added more details on the relation between 2+2 foliations and
null tetrads, updated references. Version submitted for peer reviewing. v3:
Few minor amendments, footnote added on a null congruence in the presence of
torsion; matche... | null | 10.1007/JHEP11(2017)205 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Hamiltonian dynamics of general relativity with real
connection variables on a null foliation, and use the Newman-Penrose formalism
to shed light on the geometric meaning of the various constraints. We identify
the equivalent of Sachs' constraint-free initial data as projections of
connection component... | [
{
"created": "Mon, 3 Jul 2017 17:36:35 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 2017 17:07:51 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Dec 2017 18:53:06 GMT",
"version": "v3"
}
] | 2018-01-17 | [
[
"De Paoli",
"Elena",
""
],
[
"Speziale",
"Simone",
""
]
] | We discuss the Hamiltonian dynamics of general relativity with real connection variables on a null foliation, and use the Newman-Penrose formalism to shed light on the geometric meaning of the various constraints. We identify the equivalent of Sachs' constraint-free initial data as projections of connection components ... |
0705.1765 | Dr. Anirudh Pradhan | Anirudh Pradhan, Mukesh Kumar Mishra and Anil Kumar Yadav | A New Class of String Cosmological Models in Cylindrically Symmetric
Inhomogeneous Universe | 14 pages. arXiv admin note: substantial text overlap with
arXiv:0705.0904 | Rom. J. Phys. 54:747-762,2009 | null | null | gr-qc | null | A new class of cylindrically symmetric inhomogeneous string cosmological
models is investigated. To get the deterministic solution, it has been assumed
that the expansion ($\theta$) in the model is proportional to the eigen value
$\sigma^{1}_{1}$ of the shear tensor $\sigma^{i}_{j}$. The physical and
geometric aspect... | [
{
"created": "Sat, 12 May 2007 11:08:33 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2007 13:48:34 GMT",
"version": "v2"
}
] | 2018-07-10 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Mishra",
"Mukesh Kumar",
""
],
[
"Yadav",
"Anil Kumar",
""
]
] | A new class of cylindrically symmetric inhomogeneous string cosmological models is investigated. To get the deterministic solution, it has been assumed that the expansion ($\theta$) in the model is proportional to the eigen value $\sigma^{1}_{1}$ of the shear tensor $\sigma^{i}_{j}$. The physical and geometric aspects ... |
2006.03229 | Kai Lin | Kai Lin and Wei-Liang Qian | Cosmic evolution of dark energy in a generalized Rastall gravity | Accepted by the European Physical Journal C | null | 10.1140/epjc/s10052-020-8116-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we propose a scheme for cosmic evolution in a generalized
Rastall gravity. In our approach, the role of dark energy is taken by the
non-conserved sector of the stress energy-momentum tensor. The resultant cosmic
evolution is found to naturally consists of three stages, namely, radiation
dominated, ordin... | [
{
"created": "Fri, 5 Jun 2020 04:38:54 GMT",
"version": "v1"
}
] | 2020-06-08 | [
[
"Lin",
"Kai",
""
],
[
"Qian",
"Wei-Liang",
""
]
] | In this work, we propose a scheme for cosmic evolution in a generalized Rastall gravity. In our approach, the role of dark energy is taken by the non-conserved sector of the stress energy-momentum tensor. The resultant cosmic evolution is found to naturally consists of three stages, namely, radiation dominated, ordinar... |
gr-qc/0110076 | Zbigniew Haba | Z. Haba (Institute of Theoretical Physics, Wroclaw University) | Universal regular short distance behavior from an interaction with a
scale invariant gravity | LaTeX, 4 pages | Phys.Lett. B528 (2002) 129-132 | 10.1016/S0370-2693(02)01193-0 | null | gr-qc hep-th | null | We assume that the fourdimensional quantum gravity is scale invariant at
short distances. We show through a simple scaling argument that correlation
functions of quantum fields interacting with gravity have a universal (more
regular) short distance behavior.
| [
{
"created": "Wed, 17 Oct 2001 09:01:25 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Haba",
"Z.",
"",
"Institute of Theoretical Physics, Wroclaw University"
]
] | We assume that the fourdimensional quantum gravity is scale invariant at short distances. We show through a simple scaling argument that correlation functions of quantum fields interacting with gravity have a universal (more regular) short distance behavior. |
gr-qc/0102063 | Larry Ford | L.H. Ford and Chun-Hsien Wu | Stress Tensor Fluctuations and Passive Quantum Gravity | 13 pages. Based on a talk given at the 5th Peyresq workshop. Revised
version incorporates corrections in several expressions in Sect. 5 | Int.J.Theor.Phys. 42 (2003) 15-26 | null | null | gr-qc | null | The quantum fluctuation of the stress tensor of a quantum field are
discussed, as are the resulting spacetime metric fluctuations. Passive quantum
gravity is an approximation in which gravity is not directly quantized, but
fluctuations of the spacetime geometry are driven by stress tensor
fluctuations. We discuss a d... | [
{
"created": "Tue, 13 Feb 2001 20:42:26 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2001 20:06:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ford",
"L. H.",
""
],
[
"Wu",
"Chun-Hsien",
""
]
] | The quantum fluctuation of the stress tensor of a quantum field are discussed, as are the resulting spacetime metric fluctuations. Passive quantum gravity is an approximation in which gravity is not directly quantized, but fluctuations of the spacetime geometry are driven by stress tensor fluctuations. We discuss a dec... |
1108.1835 | Theodore A. Jacobson | David Garfinkle and Ted Jacobson | A positive energy theorem for Einstein-aether and Ho\v{r}ava gravity | 4 pages | null | 10.1103/PhysRevLett.107.191102 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Energy positivity is established for a class of solutions to Einstein-aether
theory and the IR limit of Ho\v{r}ava gravity within a certain range of
coupling parameters. The class consists of solutions where the aether 4-vector
is divergence free on a spacelike surface to which it is orthogonal (which
implies that th... | [
{
"created": "Tue, 9 Aug 2011 00:33:25 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Garfinkle",
"David",
""
],
[
"Jacobson",
"Ted",
""
]
] | Energy positivity is established for a class of solutions to Einstein-aether theory and the IR limit of Ho\v{r}ava gravity within a certain range of coupling parameters. The class consists of solutions where the aether 4-vector is divergence free on a spacelike surface to which it is orthogonal (which implies that the ... |
1012.4207 | Tonguc Rador | Tongu\c{c} Rador, Sava\c{s} Arapo\u{g}lu and \.Ibrahim Semiz | Comment on "Model for Gravity at Large Distances" | We have been informed on Dec.22, 2010 that an erratum was sent to PRL
before we wrote the present comment. Due to a communication problem we were
unaware of this fact. But we believe our comment goes beyond a correction,
and adds to the physics | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We correct a sign mistake in the work mentioned in the title; explore
consequences on energy conditions in the relevant context, and make a
suggestion on the introduced parameter.
| [
{
"created": "Sun, 19 Dec 2010 20:56:00 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Dec 2010 11:59:36 GMT",
"version": "v2"
}
] | 2010-12-24 | [
[
"Rador",
"Tonguç",
""
],
[
"Arapoğlu",
"Savaş",
""
],
[
"Semiz",
"İbrahim",
""
]
] | We correct a sign mistake in the work mentioned in the title; explore consequences on energy conditions in the relevant context, and make a suggestion on the introduced parameter. |
gr-qc/0506095 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | Phantom cosmology with general potentials | 16 pages, LaTeX, to appear in Class. Quant. Grav | Class.Quant.Grav. 22 (2005) 3235-3246 | 10.1088/0264-9381/22/16/008 | null | gr-qc astro-ph hep-th | null | We present a unified treatment of the phase space of a spatially flat
homogeneous and isotropic universe dominated by a phantom field. Results on the
dynamics and the late time attractors (Big Rip, de Sitter, etc.) are derived
without specifying the form of the phantom potential, using only general
assumptions on its... | [
{
"created": "Fri, 17 Jun 2005 16:14:50 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | We present a unified treatment of the phase space of a spatially flat homogeneous and isotropic universe dominated by a phantom field. Results on the dynamics and the late time attractors (Big Rip, de Sitter, etc.) are derived without specifying the form of the phantom potential, using only general assumptions on its s... |
0706.2616 | Roald Sosnovskiy | Roald Sosnovskiy | The gravitational energy for stationary space-time | 4 pages | null | null | null | gr-qc | null | It is prove, that the gravity field energy formulas obtained for static
systems on the ground of local energy conservation law by test-particles fall,
is suitable for stationary systems.
| [
{
"created": "Mon, 18 Jun 2007 14:59:58 GMT",
"version": "v1"
}
] | 2007-06-19 | [
[
"Sosnovskiy",
"Roald",
""
]
] | It is prove, that the gravity field energy formulas obtained for static systems on the ground of local energy conservation law by test-particles fall, is suitable for stationary systems. |
1503.01672 | Burkhard Kleihaus | Burkhard Kleihaus (1), Jutta Kunz (1), and Stoytcho Yazadjiev (2) ((1)
University of Oldenburg, (2) Sofia University) | Scalarized Hairy Black Holes | 11 pages, 4 figures | Physics Letters B 744 (2015) 406 | 10.1016/j.physletb.2015.04.014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of a complex scalar field scalar-tensor theory allows for
scalarized rotating hairy black holes. We exhibit the domain of existence for
these scalarized black holes, which is bounded by scalarized rotating boson
stars and ordinary hairy black holes. We discuss the global properties of these
solutions.... | [
{
"created": "Thu, 5 Mar 2015 15:56:05 GMT",
"version": "v1"
}
] | 2015-04-24 | [
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Yazadjiev",
"Stoytcho",
""
]
] | In the presence of a complex scalar field scalar-tensor theory allows for scalarized rotating hairy black holes. We exhibit the domain of existence for these scalarized black holes, which is bounded by scalarized rotating boson stars and ordinary hairy black holes. We discuss the global properties of these solutions. L... |
0910.1254 | Gerhard Rein | Hakan Andreasson, Gerhard Rein | Formation of trapped surfaces for the spherically symmetric
Einstein-Vlasov system | 27 | J.Hyperbol.Diff.Equat.7:707-731,2010 | 10.1142/S0219891610002268 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the spherically symmetric, asymptotically flat, non-vacuum
Einstein equations, using as matter model a collisionless gas as described by
the Vlasov equation. We find explicit conditions on the initial data which
guarantee the formation of a trapped surface in the evolution which in
particular implies that... | [
{
"created": "Wed, 7 Oct 2009 13:20:28 GMT",
"version": "v1"
}
] | 2011-03-22 | [
[
"Andreasson",
"Hakan",
""
],
[
"Rein",
"Gerhard",
""
]
] | We consider the spherically symmetric, asymptotically flat, non-vacuum Einstein equations, using as matter model a collisionless gas as described by the Vlasov equation. We find explicit conditions on the initial data which guarantee the formation of a trapped surface in the evolution which in particular implies that w... |
1801.06614 | Annegret Y. Burtscher | Lars Andersson and Annegret Y. Burtscher | On the asymptotic behavior of static perfect fluids | 32 pages; minor changes in v2, final version | Annales Henri Poincar\'e, Volume 20, Issue 3 (2019), pp 813-857 | 10.1007/s00023-018-00758-z | null | gr-qc math-ph math.DG math.DS math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Static spherically symmetric solutions to the Einstein-Euler equations with
prescribed central densities are known to exist, be unique and smooth for
reasonable equations of state. Some criteria are also available to decide
whether solutions have finite extent (stars with a vacuum exterior) or infinite
extent. In the... | [
{
"created": "Sat, 20 Jan 2018 02:10:16 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2019 17:09:00 GMT",
"version": "v2"
}
] | 2019-03-01 | [
[
"Andersson",
"Lars",
""
],
[
"Burtscher",
"Annegret Y.",
""
]
] | Static spherically symmetric solutions to the Einstein-Euler equations with prescribed central densities are known to exist, be unique and smooth for reasonable equations of state. Some criteria are also available to decide whether solutions have finite extent (stars with a vacuum exterior) or infinite extent. In the l... |
1107.3322 | Vyacheslav Ivanovich Dokuchaev | Vyacheslav I. Dokuchaev and Yury N. Eroshenko | Accretion with back reaction | 5 pages, 2 figures; new figure and references added | Phys. Rev. D 84, 124022 (2011) | 10.1103/PhysRevD.84.124022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate analytically a back reaction of the stationary spherical
accretion flow near the event horizon and near the inner Cauchy horizon of the
charged black hole. It is shown that corresponding back-reaction corrections to
the black hole metric depend only on the fluid accretion rate and diverge in
the case of ... | [
{
"created": "Sun, 17 Jul 2011 18:42:03 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2011 15:02:51 GMT",
"version": "v2"
}
] | 2011-12-20 | [
[
"Dokuchaev",
"Vyacheslav I.",
""
],
[
"Eroshenko",
"Yury N.",
""
]
] | We calculate analytically a back reaction of the stationary spherical accretion flow near the event horizon and near the inner Cauchy horizon of the charged black hole. It is shown that corresponding back-reaction corrections to the black hole metric depend only on the fluid accretion rate and diverge in the case of an... |
2312.03242 | Tayyab Naseer | M. Sharif, Tayyab Naseer | Impact of Charge on Complexity Analysis and Isotropic Decoupled
Solutions in $f(\mathbb{R},\mathbb{T})$ Gravity | 34 pages, 11 figures | Phys. Scr. 98(2023)115012 | 10.1088/1402-4896/acfce6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we formulate two exact charged solutions to the field
equations by extending the domain of existing anisotropic models with the help
of minimal gravitational decoupling in $f(\mathbb{R},\mathbb{T})$ theory. For
this, the anisotropic fluid distribution is considered as a seed source that is
extended thr... | [
{
"created": "Wed, 6 Dec 2023 02:31:08 GMT",
"version": "v1"
}
] | 2023-12-07 | [
[
"Sharif",
"M.",
""
],
[
"Naseer",
"Tayyab",
""
]
] | In this paper, we formulate two exact charged solutions to the field equations by extending the domain of existing anisotropic models with the help of minimal gravitational decoupling in $f(\mathbb{R},\mathbb{T})$ theory. For this, the anisotropic fluid distribution is considered as a seed source that is extended throu... |
0908.2787 | Philip Stephens Mr | Philip Stephens | Inflation from a Non-Local Theory of Gravity | 5 Pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the inflationary dynamics of a Non-Local Theory of
gravity. This theory, based around derivatives of the Ricci Scalar in the
Einstein-Hilbert action, was previously found to be Ghost free, and to give
rise to a bouncing cosmology. Perturbation spectra are calculated and found to
be similar to those... | [
{
"created": "Wed, 19 Aug 2009 16:42:16 GMT",
"version": "v1"
}
] | 2009-08-20 | [
[
"Stephens",
"Philip",
""
]
] | This paper studies the inflationary dynamics of a Non-Local Theory of gravity. This theory, based around derivatives of the Ricci Scalar in the Einstein-Hilbert action, was previously found to be Ghost free, and to give rise to a bouncing cosmology. Perturbation spectra are calculated and found to be similar to those f... |
gr-qc/0610141 | Philip Tillman Mr. | P. Tillman | Deformation Quantization, Quantization, and the Klein-Gordon Equation | This is a proceedings to the Second International Conference on
Quantum Theories and Renormalization Group in Gravity and Cosmology | J.Phys.A40:7017-7024,2007 | 10.1088/1751-8113/40/25/S55 | null | gr-qc | null | The aim of this proceeding is to give a basic introduction to Deformation
Quantization (DQ) to physicists. We compare DQ to canonical quantization and
path integral methods. It is described how certain issues such as the roles of
associativity, covariance, dynamics, and operator orderings are understood in
the contex... | [
{
"created": "Fri, 27 Oct 2006 14:32:24 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2006 19:46:24 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Feb 2007 19:24:21 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Feb 2007 21:52:49 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Tillman",
"P.",
""
]
] | The aim of this proceeding is to give a basic introduction to Deformation Quantization (DQ) to physicists. We compare DQ to canonical quantization and path integral methods. It is described how certain issues such as the roles of associativity, covariance, dynamics, and operator orderings are understood in the context ... |
2104.06359 | Jorge Ovalle | J. Ovalle, E. Contreras, Z. Stuchlik | Kerr-de Sitter Black Hole Revisited | 7 pages, 2 figures | Phys. Rev. D 103, 084016 (2021) | 10.1103/PhysRevD.103.084016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We interpret the cosmological constant as the energy of the vacuum, and under
a minimum amount of assumptions, we show that it is deformed in the vicinity of
a black hole. This leads us to reexamine the Kerr-de Sitter solution. We
provide a new solution, simpler and geometrically richer, which shows the
impact of the... | [
{
"created": "Tue, 13 Apr 2021 17:05:54 GMT",
"version": "v1"
}
] | 2021-04-14 | [
[
"Ovalle",
"J.",
""
],
[
"Contreras",
"E.",
""
],
[
"Stuchlik",
"Z.",
""
]
] | We interpret the cosmological constant as the energy of the vacuum, and under a minimum amount of assumptions, we show that it is deformed in the vicinity of a black hole. This leads us to reexamine the Kerr-de Sitter solution. We provide a new solution, simpler and geometrically richer, which shows the impact of the r... |
2203.05157 | Xin Zhang | Qi-Ming Fu, Shao-Wen Wei, Li Zhao, Yu-Xiao Liu, Xin Zhang | Shadow and weak deflection angle of a black hole in nonlocal gravity | 16 pages, 11 figures | Universe 8, 341 (2022) | 10.3390/universe8070341 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole shadow and gravitational lensing play important roles in testing
gravitational theories in the strong field regime. As the first-order
modifications from quantum gravity, the nonlocality can be manifested by black
hole shadow and gravitational lensing. For example, the cut-off parameter
introduced by nonlo... | [
{
"created": "Thu, 10 Mar 2022 05:09:39 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2022 12:45:34 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jun 2022 03:15:17 GMT",
"version": "v3"
}
] | 2022-06-24 | [
[
"Fu",
"Qi-Ming",
""
],
[
"Wei",
"Shao-Wen",
""
],
[
"Zhao",
"Li",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Zhang",
"Xin",
""
]
] | Black hole shadow and gravitational lensing play important roles in testing gravitational theories in the strong field regime. As the first-order modifications from quantum gravity, the nonlocality can be manifested by black hole shadow and gravitational lensing. For example, the cut-off parameter introduced by nonloca... |
gr-qc/0411143 | Miguel S\'anchez | Miguel S\'anchez | Causal hierarchy of spacetimes, temporal functions and smoothness of
Geroch's splitting. A revision | Contribution to Proc. XIII Escola de Geometria Diferencial, Sao
Paulo, 2004. 21 pages, 3 figures, Latex. Minor linguistic changes, to appear
in Matem\'atica Contemporanea | Matematica Contemporanea, Vol 29, 127-155 (2005) | null | null | gr-qc | null | After the heroic epoch of Causality Theory, problems concerning the
smoothability of time functions and Cauchy hypersurfaces remained as unanswered
folk questions. Just recently solved, our aim is to discuss the state of the
art on this topic, including self-contained proofs for questions on causally
continuous, stab... | [
{
"created": "Mon, 29 Nov 2004 19:55:29 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2005 17:05:27 GMT",
"version": "v2"
}
] | 2023-04-21 | [
[
"Sánchez",
"Miguel",
""
]
] | After the heroic epoch of Causality Theory, problems concerning the smoothability of time functions and Cauchy hypersurfaces remained as unanswered folk questions. Just recently solved, our aim is to discuss the state of the art on this topic, including self-contained proofs for questions on causally continuous, stably... |
1606.03115 | Alma Rosa Mendez Rodriguez | A. R. Mendez, A. L. Garciia-Perciante and A. Sandoval-Villalbazo | On the role of dissipation in structure formation for dilute
relativistic gases: the static background case | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A correction to the Jeans stability criterion due to heat conduction is
established for the case of high temperature gases. This effect is only
relevant for relativistic fluids and includes an additional term due to a
density gradient driven heat flux. The result is obtained by thoroughly
analyzing the exponentially ... | [
{
"created": "Thu, 9 Jun 2016 20:47:16 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jun 2016 17:50:53 GMT",
"version": "v2"
}
] | 2016-06-16 | [
[
"Mendez",
"A. R.",
""
],
[
"Garciia-Perciante",
"A. L.",
""
],
[
"Sandoval-Villalbazo",
"A.",
""
]
] | A correction to the Jeans stability criterion due to heat conduction is established for the case of high temperature gases. This effect is only relevant for relativistic fluids and includes an additional term due to a density gradient driven heat flux. The result is obtained by thoroughly analyzing the exponentially gr... |
1911.09689 | Gabriele Franciolini | V. De Luca, G. Franciolini, A. Kehagias, A. Riotto | On the Gauge Invariance of Cosmological Gravitational Waves | 26 pages, 3 figures, version accepted by JCAP | null | 10.1088/1475-7516/2020/03/014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The issue of the gauge invariance of gravitational waves arises if they are
produced in the early universe at second-order in perturbation theory. We
address it by dividing the discussion about the gauge invariance in three
parts: the production of gravitational waves, their propagation in the real
universe, and thei... | [
{
"created": "Thu, 21 Nov 2019 19:00:09 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Dec 2019 18:40:15 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Mar 2020 15:45:28 GMT",
"version": "v3"
}
] | 2020-03-18 | [
[
"De Luca",
"V.",
""
],
[
"Franciolini",
"G.",
""
],
[
"Kehagias",
"A.",
""
],
[
"Riotto",
"A.",
""
]
] | The issue of the gauge invariance of gravitational waves arises if they are produced in the early universe at second-order in perturbation theory. We address it by dividing the discussion about the gauge invariance in three parts: the production of gravitational waves, their propagation in the real universe, and their ... |
1001.1838 | Catherine Meusburger | C. Meusburger | Spacetime geometry in (2+1)-gravity via measurements with returning
lightrays | Talk given at the XXV Max Born Symposium: The Planck Scale (Wroclaw,
June 29-July 3 2009) 10 pages, 4 eps figures | AIP Conf. Proc. 1196 (2009) 181-189 | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an observer in a (2+1)-spacetime without matter and cosmological
constant who measures spacetime geometry by emitting lightrays which return to
him at a later time. We investigate several quantities associated with such
lightrays: the return time, the directions into which light needs to be emitted
to ret... | [
{
"created": "Tue, 12 Jan 2010 10:41:19 GMT",
"version": "v1"
}
] | 2010-01-24 | [
[
"Meusburger",
"C.",
""
]
] | We consider an observer in a (2+1)-spacetime without matter and cosmological constant who measures spacetime geometry by emitting lightrays which return to him at a later time. We investigate several quantities associated with such lightrays: the return time, the directions into which light needs to be emitted to retur... |
1605.06463 | Marek Nowakowski | P. Bargue\~no, S. Bravo Medina, M. Nowakowski, D. Batic | Quantum Mechanical Corrections to the Schwarzschild Black Hole Metric | 14 pages Latex, enlarged version as compared to the published one | Eur. Phys. Lett. 117, (2017) 60006 | 10.1209/0295-5075/117/60006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by quantum mechanical corrections to the Newtonian potential, which
can be translated into an $\hbar$-correction to the $g_{00}$ component of the
Schwarzschild metric, we construct a quantum mechanically corrected metric
assuming $-g_{00}=g^{rr}$. We show how the Bekenstein black hole entropy $S$
receives i... | [
{
"created": "Fri, 20 May 2016 18:34:25 GMT",
"version": "v1"
},
{
"created": "Wed, 31 May 2017 21:14:00 GMT",
"version": "v2"
}
] | 2017-06-02 | [
[
"Bargueño",
"P.",
""
],
[
"Medina",
"S. Bravo",
""
],
[
"Nowakowski",
"M.",
""
],
[
"Batic",
"D.",
""
]
] | Motivated by quantum mechanical corrections to the Newtonian potential, which can be translated into an $\hbar$-correction to the $g_{00}$ component of the Schwarzschild metric, we construct a quantum mechanically corrected metric assuming $-g_{00}=g^{rr}$. We show how the Bekenstein black hole entropy $S$ receives its... |
1311.2409 | Alicia M. Sintes | The LIGO Scientific Collaboration, The Virgo Collaboration: J. Aasi,
J. Abadie, B. P. Abbott, R. Abbott, T. Abbott, M. R. Abernathy, T. Accadia,
F. Acernese, C. Adams, T. Adams, R. X. Adhikari, C. Affeldt, M. Agathos, N.
Aggarwal, O. D. Aguiar, P. Ajith, B. Allen, A. Allocca, E. Amador Ceron, D.
Amariutei, R. A... | Application of a Hough search for continuous gravitational waves on data
from the 5th LIGO science run | Accepted in Classical and Quantum Gravity. Science summary of results
available at http://www.ligo.org/science/Publication-S5CWHough/index.php | null | 10.1088/0264-9381/31/8/085014 | LIGO Document P1300071 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on an all-sky search for periodic gravitational waves in the
frequency range $\mathrm{50-1000 Hz}$ with the first derivative of frequency in
the range $-8.9 \times 10^{-10}$ Hz/s to zero in two years of data collected
during LIGO's fifth science run. Our results employ a Hough transform
technique, introduci... | [
{
"created": "Mon, 11 Nov 2013 10:32:54 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Nov 2013 11:03:27 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Mar 2014 10:54:38 GMT",
"version": "v3"
}
] | 2015-06-17 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"The Virgo Collaboration",
"",
""
],
[
"Aasi",
"J.",
""
],
[
"Abadie",
"J.",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T.",
""
... | We report on an all-sky search for periodic gravitational waves in the frequency range $\mathrm{50-1000 Hz}$ with the first derivative of frequency in the range $-8.9 \times 10^{-10}$ Hz/s to zero in two years of data collected during LIGO's fifth science run. Our results employ a Hough transform technique, introducing... |
gr-qc/0406110 | Dmitri Burlankov E. | D.E. Burlankov | The Quantum Big Bang in Global Time Theory | 4 pages | null | null | null | gr-qc | null | The it Global Time Theory (GTT) is the further development of the General
Relativity (GR). GTT significantly differs from GR in the general physical
concepts, but retains 90% of the mathematical structure and main results. The
dynamics equations are derived from Lagrangian, and the Hamiltonian of
gravitation is nonze... | [
{
"created": "Mon, 28 Jun 2004 08:32:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burlankov",
"D. E.",
""
]
] | The it Global Time Theory (GTT) is the further development of the General Relativity (GR). GTT significantly differs from GR in the general physical concepts, but retains 90% of the mathematical structure and main results. The dynamics equations are derived from Lagrangian, and the Hamiltonian of gravitation is nonzero... |
1801.06017 | Jakub Mielczarek Ph.D. | Jakub Mielczarek | Spin networks on adiabatic quantum computer | 16 pages, 10 figure, comments are welcome | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article is addressing a possibility of implementation of spin network
states on adiabatic quantum computer. The discussion is focused on application
of currently available technologies and analyzes a concrete example of D-Wave
machine. A class of simple spin network states which can be implemented on the
Chimera ... | [
{
"created": "Thu, 18 Jan 2018 13:56:53 GMT",
"version": "v1"
}
] | 2018-01-19 | [
[
"Mielczarek",
"Jakub",
""
]
] | The article is addressing a possibility of implementation of spin network states on adiabatic quantum computer. The discussion is focused on application of currently available technologies and analyzes a concrete example of D-Wave machine. A class of simple spin network states which can be implemented on the Chimera gr... |
1907.10329 | Arianna Renzini | Arianna Renzini and Carlo Contaldi | Improved limits on a stochastic gravitational-wave background and its
anisotropies from Advanced LIGO O1 and O2 runs | 9 pages, 8 figures | Phys. Rev. D 100, 063527 (2019) | 10.1103/PhysRevD.100.063527 | null | gr-qc astro-ph.CO astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We integrate the entire, publicly available, Advanced LIGO (ALIGO) data set
to obtain maximum-likelihood constraint maps of the Stochastic
Gravitational-Wave Background (SGWB). From these we derive limits on the energy
density of the stochastic background $\Omega_{\rm GW}$, and its anisotropy. We
find 95% confident l... | [
{
"created": "Wed, 24 Jul 2019 09:49:26 GMT",
"version": "v1"
}
] | 2019-09-25 | [
[
"Renzini",
"Arianna",
""
],
[
"Contaldi",
"Carlo",
""
]
] | We integrate the entire, publicly available, Advanced LIGO (ALIGO) data set to obtain maximum-likelihood constraint maps of the Stochastic Gravitational-Wave Background (SGWB). From these we derive limits on the energy density of the stochastic background $\Omega_{\rm GW}$, and its anisotropy. We find 95% confident lim... |
2304.14769 | Masahiko Taniguchi | Tomohiro Inagaki, Hiroki Sakamoto, Masahiko Taniguchi | Robustness of predicted CMB fluctuations in Cartan $F(R)$ gravity | 14pages, 4figures | JCAP 09 (2023) 014 | 10.1088/1475-7516/2023/09/014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmology of the $F(R)$ gravity rebuilding by the Cartan formalism is
investigated. This is called Cartan $F(R)$ gravity. The well-known $F(R)$
gravity has been introduced to extend the standard cosmology, e.g. to explain
the cosmological accelerated expansion as the inflation. Cartan $F(R)$ gravity
is based on t... | [
{
"created": "Fri, 28 Apr 2023 11:28:13 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Sep 2023 13:54:07 GMT",
"version": "v2"
}
] | 2023-09-25 | [
[
"Inagaki",
"Tomohiro",
""
],
[
"Sakamoto",
"Hiroki",
""
],
[
"Taniguchi",
"Masahiko",
""
]
] | The cosmology of the $F(R)$ gravity rebuilding by the Cartan formalism is investigated. This is called Cartan $F(R)$ gravity. The well-known $F(R)$ gravity has been introduced to extend the standard cosmology, e.g. to explain the cosmological accelerated expansion as the inflation. Cartan $F(R)$ gravity is based on the... |
gr-qc/9910036 | Fran DeAquino | Fran De Aquino (Maranhao State University, Brazil) | Theory of Everything | arXiv admin note: substantial text overlap with
arXiv:physics/9904018, arXiv:physics/0212033, arXiv:physics/0701091 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a set of 25 articles, developed starting from the Relativistic Theory
of Quantum Gravity (first article). Together they form the Theory of
Everything.
| [
{
"created": "Mon, 11 Oct 1999 22:31:57 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 2013 19:27:50 GMT",
"version": "v10"
},
{
"created": "Wed, 4 Dec 2013 10:26:08 GMT",
"version": "v11"
},
{
"created": "Tue, 12 Oct 1999 13:34:46 GMT",
"version": "v2"
},
{
"... | 2013-12-05 | [
[
"De Aquino",
"Fran",
"",
"Maranhao State University, Brazil"
]
] | This is a set of 25 articles, developed starting from the Relativistic Theory of Quantum Gravity (first article). Together they form the Theory of Everything. |
gr-qc/9308026 | Hugh Luckock | R. Graham and H. Luckock | Nicolai Maps for Quantum Cosmology | 17 pages, Latex, Sydney University Maths Report 93-26 | Phys.Rev. D49 (1994) 2786-2791 | 10.1103/PhysRevD.49.2786 | null | gr-qc | null | We construct Nicolai maps for $N=2$ supersymmetric extensions of
minisuperspace models. It is shown that Nicolai maps exist for only a very
restricted set of states. In the models considered these are the two states
corresponding to the empty and the filled fermion sectors. The form of the
Nicolai maps in these secto... | [
{
"created": "Tue, 24 Aug 1993 04:29:12 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Graham",
"R.",
""
],
[
"Luckock",
"H.",
""
]
] | We construct Nicolai maps for $N=2$ supersymmetric extensions of minisuperspace models. It is shown that Nicolai maps exist for only a very restricted set of states. In the models considered these are the two states corresponding to the empty and the filled fermion sectors. The form of the Nicolai maps in these sectors... |
gr-qc/9902058 | Maria da Conceicao Bento | M. C. Bento | Maximally Symmetric Cosmological Solutions of Type II Superstrings | 5 pages, Latex, no figures, talk presented at "New Worlds in
Astroparticle Physics" 1998, Faro, Portugal | null | null | null | gr-qc | null | We study maximally symmetric cosmological solutions of type II supersymmetric
strings in the presence of the exact, SL(2,Z)-invariant, higher-curvature
corrections to the lowest order effective action. We find that, unlike the case
of type IIA theories, de Sitter solutions exist, at all orders in $\alpha'$,
for type ... | [
{
"created": "Fri, 19 Feb 1999 16:17:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bento",
"M. C.",
""
]
] | We study maximally symmetric cosmological solutions of type II supersymmetric strings in the presence of the exact, SL(2,Z)-invariant, higher-curvature corrections to the lowest order effective action. We find that, unlike the case of type IIA theories, de Sitter solutions exist, at all orders in $\alpha'$, for type II... |
1807.08771 | Angelo Esposito | Angelo Esposito, Rafael Krichevsky, Alberto Nicolis | The gravitational mass carried by sound waves | 6 pages | Phys. Rev. Lett. 122, 084501 (2019) | 10.1103/PhysRevLett.122.084501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the commonly accepted statement that sound waves do not
transport mass is only true at linear order. Using effective field theory
techniques, we confirm the result found in [1] for zero-temperature
superfluids, and extend it to the case of solids and ordinary fluids. We show
that, in fact, sound waves do... | [
{
"created": "Mon, 23 Jul 2018 18:05:05 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Mar 2019 09:14:32 GMT",
"version": "v2"
}
] | 2019-08-13 | [
[
"Esposito",
"Angelo",
""
],
[
"Krichevsky",
"Rafael",
""
],
[
"Nicolis",
"Alberto",
""
]
] | We show that the commonly accepted statement that sound waves do not transport mass is only true at linear order. Using effective field theory techniques, we confirm the result found in [1] for zero-temperature superfluids, and extend it to the case of solids and ordinary fluids. We show that, in fact, sound waves do c... |
gr-qc/0304083 | Dejan Stojkovic | Valeri Frolov, Martin Snajdr and Dejan Stojkovic | Interaction of a brane with a moving bulk black hole | version accepted for publication in Phys. Rev. D | Phys.Rev. D68 (2003) 044002 | 10.1103/PhysRevD.68.044002 | null | gr-qc astro-ph hep-ph hep-th | null | We study the interaction of an n-dimensional topological defect (n-brane)
described by the Nambu-Goto action with a higher-dimensional Schwarzschild
black hole moving in the bulk spacetime. We derive the general form of the
perturbation equations for an n-brane in the weak field approximation and solve
them analytica... | [
{
"created": "Tue, 22 Apr 2003 17:34:45 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2003 16:25:04 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Frolov",
"Valeri",
""
],
[
"Snajdr",
"Martin",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | We study the interaction of an n-dimensional topological defect (n-brane) described by the Nambu-Goto action with a higher-dimensional Schwarzschild black hole moving in the bulk spacetime. We derive the general form of the perturbation equations for an n-brane in the weak field approximation and solve them analyticall... |
1411.1963 | Frank L\"offler | Frank L\"offler and Roberto De Pietri and Alessandra Feo and Luca
Franci and Francesco Maione | Stiffness effects on the dynamics of the bar-mode instability of Neutron
Stars in full General Relativity | 12 pages, 5 figures. arXiv admin note: substantial text overlap with
arXiv:1403.8066 | Phys. Rev. D 91, 064057 (2015) | 10.1103/PhysRevD.91.064057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results on the effect of the stiffness of the equation of state on
the dynamical bar-mode instability in rapidly rotating polytropic models of
neutron stars in full General Relativity. We determine the change in the
threshold for the emergence of the instability for a range of the adiabatic
$\Gamma$ index ... | [
{
"created": "Fri, 7 Nov 2014 16:27:22 GMT",
"version": "v1"
}
] | 2015-04-01 | [
[
"Löffler",
"Frank",
""
],
[
"De Pietri",
"Roberto",
""
],
[
"Feo",
"Alessandra",
""
],
[
"Franci",
"Luca",
""
],
[
"Maione",
"Francesco",
""
]
] | We present results on the effect of the stiffness of the equation of state on the dynamical bar-mode instability in rapidly rotating polytropic models of neutron stars in full General Relativity. We determine the change in the threshold for the emergence of the instability for a range of the adiabatic $\Gamma$ index fr... |
1111.3415 | Sergey Sushkov | Sergey Sushkov, Roman Korolev | Scalar wormholes with nonminimal derivative coupling | 17 pages, 8 figures | null | 10.1088/0264-9381/29/8/085008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider static spherically symmetric wormhole configurations in a
gravitational theory of a scalar field with a potential $V(\phi)$ and
nonminimal derivative coupling to the curvature describing by the term
$(\epsilon g_{\mu\nu} + \kappa G_{\mu\nu}) \phi^{,\mu}\phi^{,\nu}$ in the
action. We show that the flare-ou... | [
{
"created": "Tue, 15 Nov 2011 02:45:36 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Sushkov",
"Sergey",
""
],
[
"Korolev",
"Roman",
""
]
] | We consider static spherically symmetric wormhole configurations in a gravitational theory of a scalar field with a potential $V(\phi)$ and nonminimal derivative coupling to the curvature describing by the term $(\epsilon g_{\mu\nu} + \kappa G_{\mu\nu}) \phi^{,\mu}\phi^{,\nu}$ in the action. We show that the flare-out ... |
2104.00988 | Mark Robert Baker | Mark Robert Baker | A connection between linearized Gauss-Bonnet gravity and classical
electrodynamics II: Complete dual formulation | 26 pages | International Journal of Modern Physics D, Vol. 30, No. 04,
2150030 (2021) | 10.1142/S0218271821500309 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent publication a procedure was developed which can be used to derive
completely gauge invariant models from general Lagrangian densities with $N$
order of derivatives and $M$ rank of tensor potential. This procedure was then
used to show that unique models follow for each order, namely classical
electrodynam... | [
{
"created": "Fri, 2 Apr 2021 11:15:01 GMT",
"version": "v1"
}
] | 2021-04-05 | [
[
"Baker",
"Mark Robert",
""
]
] | In a recent publication a procedure was developed which can be used to derive completely gauge invariant models from general Lagrangian densities with $N$ order of derivatives and $M$ rank of tensor potential. This procedure was then used to show that unique models follow for each order, namely classical electrodynamic... |
1906.03116 | Lior M. Burko | Lior M. Burko, Gaurav Khanna, and Subir Sabharwal | (Transient) Scalar Hair for (Nearly) Extreme Black Holes | 5 pages, 8 figures | Phys. Rev. Research 1, 033106 (2019) | 10.1103/PhysRevResearch.1.033106 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown recently that extreme Reissner-Nordstr\"{o}m black holes
perturbed by a minimally coupled, free, massless scalar field have permanent
scalar hair. The hair - a conserved charge calculated at the black hole's event
horizon - can be measured by a certain expression at future null infinity: the
latter ... | [
{
"created": "Fri, 7 Jun 2019 14:14:25 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2019 13:16:29 GMT",
"version": "v2"
}
] | 2019-11-19 | [
[
"Burko",
"Lior M.",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Sabharwal",
"Subir",
""
]
] | It has been shown recently that extreme Reissner-Nordstr\"{o}m black holes perturbed by a minimally coupled, free, massless scalar field have permanent scalar hair. The hair - a conserved charge calculated at the black hole's event horizon - can be measured by a certain expression at future null infinity: the latter ap... |
gr-qc/9409004 | Jorge Pullin | Jorge Pullin (Editor) | MATTERS OF GRAVITY, a newsletter for the gravity community, Number 4 | Plain TeX, 24 pages | null | null | MOG-4 | gr-qc | null | Table of contents
Editorial.
Gravity News:
Report on the APS topical group in gravitation, Beverly Berger.
Research briefs:
Gravitational microlensing and the search for dark matter, Bohdan Paczynski.
Laboratory gravity: the G mystery, Riley Newman.
LIGO project update, Stan Whitcomb.
Conference Repor... | [
{
"created": "Fri, 2 Sep 1994 21:49:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pullin",
"Jorge",
"",
"Editor"
]
] | Table of contents Editorial. Gravity News: Report on the APS topical group in gravitation, Beverly Berger. Research briefs: Gravitational microlensing and the search for dark matter, Bohdan Paczynski. Laboratory gravity: the G mystery, Riley Newman. LIGO project update, Stan Whitcomb. Conference Reports PASCOS '94, Pet... |
1407.4673 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Counterrotational effects on stability of 2+1-dimensional thin-shell
wormholes | 5 pages, 2 figures, final version published in EPJC | Eur. Phys. J. C (2014) 74:3073 | 10.1140/epjc/s10052-014-3073-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of angular momentum in a 2+1-dimensional rotating thin-shell
wormhole (TSW) is considered. Particular emphasis is made on stability when the
shells (rings) are counterrotating. We find that counter-rotating halves make
the TSW supported by the equation of state of a linear gas more stable. Under a
small velo... | [
{
"created": "Tue, 15 Jul 2014 20:03:32 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 2014 05:54:45 GMT",
"version": "v2"
}
] | 2014-09-30 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | The role of angular momentum in a 2+1-dimensional rotating thin-shell wormhole (TSW) is considered. Particular emphasis is made on stability when the shells (rings) are counterrotating. We find that counter-rotating halves make the TSW supported by the equation of state of a linear gas more stable. Under a small veloci... |
1512.05757 | Antonio Enea Romano | Antonio Enea Romano, Sander Mooij, Misao Sasaki | Adiabaticity and gravity theory independent conservation laws for
cosmological perturbations | 6 pages, accepted in Physics Letters B | null | 10.1016/j.physletb.2016.02.054 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We carefully study the implications of adiabaticity for the behavior of
cosmological perturbations. There are essentially three similar but different
definitions of non-adiabaticity: one is appropriate for a thermodynamic fluid
$\delta P_{nad}$, another is for a general matter field $\delta P_{c,nad}$, and
the last o... | [
{
"created": "Thu, 17 Dec 2015 20:29:09 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 2016 06:47:09 GMT",
"version": "v2"
}
] | 2016-07-29 | [
[
"Romano",
"Antonio Enea",
""
],
[
"Mooij",
"Sander",
""
],
[
"Sasaki",
"Misao",
""
]
] | We carefully study the implications of adiabaticity for the behavior of cosmological perturbations. There are essentially three similar but different definitions of non-adiabaticity: one is appropriate for a thermodynamic fluid $\delta P_{nad}$, another is for a general matter field $\delta P_{c,nad}$, and the last one... |
2005.03989 | Sergio Cacciatori | Sergio L. Cacciatori | Gravitational waves, 100 years later | Extended version of a communication to appear on "Rendiconti
dell'Istituto Lombardo dell'Accademia delle Scienze e delle Lettere" in a
reduced version (without the appendices) | null | null | null | gr-qc physics.pop-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a short communication on the recent direct measurements of
gravitational waves, made possible by the joint efforts of the LIGO and the
Virgo projects. These notes are devoted to a broad audience. In the first part
we will present the basic ideas of the theory of relativity, leading to the
prediction of the... | [
{
"created": "Fri, 8 May 2020 12:43:34 GMT",
"version": "v1"
}
] | 2020-05-11 | [
[
"Cacciatori",
"Sergio L.",
""
]
] | We present a short communication on the recent direct measurements of gravitational waves, made possible by the joint efforts of the LIGO and the Virgo projects. These notes are devoted to a broad audience. In the first part we will present the basic ideas of the theory of relativity, leading to the prediction of the e... |
gr-qc/9401017 | Cenalo Vaz | Cenalo Vaz and Louis Witten | Wilson Loops and Black Holes in 2+1 Dimensions | PHYZZX, 10 pages, UATP-9306 | Phys.Lett. B327 (1994) 29-34 | 10.1016/0370-2693(94)91523-7 | null | gr-qc hep-th | null | In 2+1 dimensional Chern-Simons gravity, Wilson loops in the three
dimensional Anti de Sitter group, $SO(2,2)$, reproduce the spinning black hole
of Ba\~nados, Teitelboim and Zanelli (BTZ) by naturally duplicating the
necessary identification of points of a four dimensional globally $SO(2,2)$
invariant space in which... | [
{
"created": "Mon, 17 Jan 1994 22:41:55 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Vaz",
"Cenalo",
""
],
[
"Witten",
"Louis",
""
]
] | In 2+1 dimensional Chern-Simons gravity, Wilson loops in the three dimensional Anti de Sitter group, $SO(2,2)$, reproduce the spinning black hole of Ba\~nados, Teitelboim and Zanelli (BTZ) by naturally duplicating the necessary identification of points of a four dimensional globally $SO(2,2)$ invariant space in which t... |
2006.11552 | Oleg Zaslavskii | O. B. Zaslavskii | Special case of the Ba\~{n}ados-Silk-West effect | 12 pages. Matches published version | Phys. Rev. D 102, 044051 (2020) | 10.1103/PhysRevD.102.044051 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If two particles collide near the rotating extremal black hole and one of
them is fine-tuned, the energy in the center of mass frame $E_{c.m.}$ can grow
unbounded. This is the so-called Ba\~{n}ados-Silk-West (BSW) effect. Recently,
another type of high energy collisions was considered in which all processes
happen in... | [
{
"created": "Sat, 20 Jun 2020 11:31:17 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2020 14:40:21 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Aug 2020 19:56:29 GMT",
"version": "v3"
}
] | 2020-09-02 | [
[
"Zaslavskii",
"O. B.",
""
]
] | If two particles collide near the rotating extremal black hole and one of them is fine-tuned, the energy in the center of mass frame $E_{c.m.}$ can grow unbounded. This is the so-called Ba\~{n}ados-Silk-West (BSW) effect. Recently, another type of high energy collisions was considered in which all processes happen in t... |
1101.5479 | Luisa T. Buchman | James M. Bardeen, Olivier Sarbach, Luisa T. Buchman | Tetrad formalism for numerical relativity on conformally compactified
constant mean curvature hypersurfaces | Corrected factor of 2 errors in Eqs. (A8) and (A9) and a few typos;
final version | Phys.Rev.D83:104045,2011 | 10.1103/PhysRevD.83.104045 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new evolution system for Einstein's field equations which is
based on tetrad fields and conformally compactified hyperboloidal spatial
hypersurfaces which reach future null infinity. The boost freedom in the choice
of the tetrad is fixed by requiring that its timelike leg be orthogonal to the
foliation, ... | [
{
"created": "Fri, 28 Jan 2011 09:07:39 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2011 20:52:03 GMT",
"version": "v2"
},
{
"created": "Thu, 5 May 2011 23:37:27 GMT",
"version": "v3"
}
] | 2011-06-07 | [
[
"Bardeen",
"James M.",
""
],
[
"Sarbach",
"Olivier",
""
],
[
"Buchman",
"Luisa T.",
""
]
] | We present a new evolution system for Einstein's field equations which is based on tetrad fields and conformally compactified hyperboloidal spatial hypersurfaces which reach future null infinity. The boost freedom in the choice of the tetrad is fixed by requiring that its timelike leg be orthogonal to the foliation, wh... |
gr-qc/0503054 | Robert Lompay | R.R. Lompay | Deriving Mathisson - Papapetrou equations from relativistic
pseudomechanics | 5 pages, 0 figures | null | null | null | gr-qc | null | It is shown that the equations of motion of a test point particle with spin
in a given gravitational field, so called Mathisson - Papapetrou equations, can
be derived from Euler - Lagrange equations of the relativistic pseudomechanics
-- relativistic mechanics, which side by side uses the conventional (commuting)
and... | [
{
"created": "Sat, 12 Mar 2005 19:15:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lompay",
"R. R.",
""
]
] | It is shown that the equations of motion of a test point particle with spin in a given gravitational field, so called Mathisson - Papapetrou equations, can be derived from Euler - Lagrange equations of the relativistic pseudomechanics -- relativistic mechanics, which side by side uses the conventional (commuting) and G... |
2310.03785 | Quentin Henry | Quentin Henry and Fran\c{c}ois Larrouturou and Christophe Le
Poncin-Lafitte | Electromagnetic fields in compact binaries: post-Newtonian wave
generation and application to double white dwarfs systems | 44 pages | Phys. Rev. D 109, 084048 (2024) | 10.1103/PhysRevD.109.084048 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The aim of this work is twofold: (i) to properly define a wave-generation
formalism for compact-supported sources embedded in Einstein-Maxwell theory,
relying on matched post-Newtonian and multipolar-post-Minkowskian expansions;
(ii) to apply this formalism (which is valid for any type of post-Newtonian
sources) to t... | [
{
"created": "Thu, 5 Oct 2023 18:00:00 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Henry",
"Quentin",
""
],
[
"Larrouturou",
"François",
""
],
[
"Poncin-Lafitte",
"Christophe Le",
""
]
] | The aim of this work is twofold: (i) to properly define a wave-generation formalism for compact-supported sources embedded in Einstein-Maxwell theory, relying on matched post-Newtonian and multipolar-post-Minkowskian expansions; (ii) to apply this formalism (which is valid for any type of post-Newtonian sources) to the... |
1712.09422 | David Garfinkle | David Garfinkle | Matters of Gravity, The Newsletter of the Division of Gravitational
Physics of the American Physical Society, Volume 50, December 2017 | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | DGRAV News:
We hear that ....
APS April Meeting
Town Hall Meeting
Conference Reports:
Hawking Conference
Benasque workshop 2017
QIQG 3
Obituary:
Remembering Cecile De Witt-Morette
| [
{
"created": "Tue, 26 Dec 2017 21:27:23 GMT",
"version": "v1"
}
] | 2017-12-29 | [
[
"Garfinkle",
"David",
""
]
] | DGRAV News: We hear that .... APS April Meeting Town Hall Meeting Conference Reports: Hawking Conference Benasque workshop 2017 QIQG 3 Obituary: Remembering Cecile De Witt-Morette |
1208.1357 | Valery Kiselev | V. V. Kiselev | Thermodynamical instability of black holes | 7 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In contrast to Hawking radiation of black hole with a given spacetime
structure, we consider a competitive transition due to a heat transfer from a
hotter inner horizon to a colder outer horizon of Kerr black hole, that results
in a stable thermodynamical state of extremal black hole. In this process, by
supposing an... | [
{
"created": "Tue, 7 Aug 2012 08:03:20 GMT",
"version": "v1"
}
] | 2012-08-08 | [
[
"Kiselev",
"V. V.",
""
]
] | In contrast to Hawking radiation of black hole with a given spacetime structure, we consider a competitive transition due to a heat transfer from a hotter inner horizon to a colder outer horizon of Kerr black hole, that results in a stable thermodynamical state of extremal black hole. In this process, by supposing an e... |
gr-qc/0505066 | Yavuz Nutku | Y. Nutku | What is the present-day status of The Copernican Principle? | an essay deemed not to be worthy of even an honorable mention | null | null | null | gr-qc | null | I point out that according to the Copernican principle our universe is not
unique. The way to make sense out of this statement is for us to construct a
gravitational instanton that will tunnel out of our vacuum into another, to
form a universe other than our Hubble bubble.
| [
{
"created": "Fri, 13 May 2005 08:56:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nutku",
"Y.",
""
]
] | I point out that according to the Copernican principle our universe is not unique. The way to make sense out of this statement is for us to construct a gravitational instanton that will tunnel out of our vacuum into another, to form a universe other than our Hubble bubble. |
0803.4482 | Pranesh Sundararajan | Pranesh A. Sundararajan | The transition from adiabatic inspiral to geodesic plunge for a compact
object around a massive Kerr black hole: Generic orbits | 11 pages, 6 figures. Accepted by Phys. Rev. D. New version addresses
referee's comments | Phys.Rev.D77:124050,2008 | 10.1103/PhysRevD.77.124050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inspiral of a stellar mass compact object falling into a massive Kerr
black hole can be broken into three different regimes: An adiabatic inspiral
phase, where the inspiral timescale is much larger than the orbital period; a
late-time radial infall, which can be approximated as a plunging geodesic; and
a regime w... | [
{
"created": "Mon, 31 Mar 2008 15:38:54 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Apr 2008 14:14:32 GMT",
"version": "v2"
},
{
"created": "Thu, 8 May 2008 15:45:12 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Sundararajan",
"Pranesh A.",
""
]
] | The inspiral of a stellar mass compact object falling into a massive Kerr black hole can be broken into three different regimes: An adiabatic inspiral phase, where the inspiral timescale is much larger than the orbital period; a late-time radial infall, which can be approximated as a plunging geodesic; and a regime whe... |
1809.01993 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Traversable wormholes sustained by an extra spatial dimension | 10 pages, no figures | Physical Review D, vol. 98, 064041 (2018) | 10.1103/PhysRevD.98.064041 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores the effect of an extra spatial dimension on a
Morris-Thorne wormhole. After proposing a suitable model, it is shown that
under certain conditions, the throat of the wormhole can be threaded with
ordinary matter, while the unavoidable violation of the null energy condition
can be attributed to the ... | [
{
"created": "Thu, 6 Sep 2018 13:51:16 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2019 14:01:22 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Dec 2023 15:58:02 GMT",
"version": "v3"
}
] | 2023-12-05 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | This paper explores the effect of an extra spatial dimension on a Morris-Thorne wormhole. After proposing a suitable model, it is shown that under certain conditions, the throat of the wormhole can be threaded with ordinary matter, while the unavoidable violation of the null energy condition can be attributed to the ex... |
2403.00882 | Rahul Mapari Dr. | R. V. Mapari, D. D. Pawar, V. R. Patil, and J. L. Pawde | Interacting Field Cosmological Model in Lyra Geometry | 19 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper explores a plane symmetric cosmological model within the framework
of the Lyra manifold, incorporating interactions among various fields. These
fields include a charged perfect fluid, a mass-less scalar field, and an
electromagnetic field. The study focuses on deriving relativistic field
equations and exact... | [
{
"created": "Fri, 1 Mar 2024 09:28:57 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Mapari",
"R. V.",
""
],
[
"Pawar",
"D. D.",
""
],
[
"Patil",
"V. R.",
""
],
[
"Pawde",
"J. L.",
""
]
] | The paper explores a plane symmetric cosmological model within the framework of the Lyra manifold, incorporating interactions among various fields. These fields include a charged perfect fluid, a mass-less scalar field, and an electromagnetic field. The study focuses on deriving relativistic field equations and exact s... |
1606.07644 | Zhi-Chao Zhao | Zhe Chang, Chao-Guang Huang, Zhi-Chao Zhao | Propagation effect of gravitational wave on detector response | null | null | 10.1007/s11433-016-0268-1 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The response of a detector to gravitational wave is a function of frequency.
When the time a photon moving around in the Fabry-Perot cavities is the same
order of the period of a gravitational wave, the phase-difference due to the
gravitational wave should be an integral along the path. We present a formula
descripti... | [
{
"created": "Fri, 24 Jun 2016 11:24:45 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jul 2016 06:52:56 GMT",
"version": "v2"
}
] | 2016-08-01 | [
[
"Chang",
"Zhe",
""
],
[
"Huang",
"Chao-Guang",
""
],
[
"Zhao",
"Zhi-Chao",
""
]
] | The response of a detector to gravitational wave is a function of frequency. When the time a photon moving around in the Fabry-Perot cavities is the same order of the period of a gravitational wave, the phase-difference due to the gravitational wave should be an integral along the path. We present a formula description... |
1905.05273 | Petya Nedkova | Galin Gyulchev, Petya Nedkova, Tsvetan Vetsov, Stoytcho Yazadjiev | Image of the Janis-Newman-Winicour naked singularity with a thin
accretion disk | 21 pages; 9 figures | Phys. Rev. D 100, 024055 (2019) | 10.1103/PhysRevD.100.024055 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the optical appearance and the apparent radiation flux of a thin
accretion disk around the static Janis-Newman-Winicour naked singularity. We
confine ourselves to the astrophysically most relevant case, when the solution
possesses a photon sphere, assuming that the radiation emitted by the disk is
described ... | [
{
"created": "Mon, 13 May 2019 20:12:41 GMT",
"version": "v1"
}
] | 2019-07-31 | [
[
"Gyulchev",
"Galin",
""
],
[
"Nedkova",
"Petya",
""
],
[
"Vetsov",
"Tsvetan",
""
],
[
"Yazadjiev",
"Stoytcho",
""
]
] | We study the optical appearance and the apparent radiation flux of a thin accretion disk around the static Janis-Newman-Winicour naked singularity. We confine ourselves to the astrophysically most relevant case, when the solution possesses a photon sphere, assuming that the radiation emitted by the disk is described by... |
1809.03952 | Maur\'icio Richartz | Carolina L. Benone and Lu\'is C. B. Crispino and Carlos A. R. Herdeiro
and Maur\'icio Richartz | Synchronized stationary clouds in a static fluid | v2: 7 pages, 4 figures. Accepted for publication in Physics Letters B | Physics Letters B 786 (2018) pp. 442-447 | 10.1016/j.physletb.2018.10.030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of stationary bound states for the hydrodynamic velocity field
between two concentric cylinders is established. We argue that rotational
motion, together with a trapping mechanism for the associated field, is
sufficient to mitigate energy dissipation between the cylinders, thus allowing
the existence of... | [
{
"created": "Tue, 11 Sep 2018 14:59:24 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Oct 2018 23:35:21 GMT",
"version": "v2"
}
] | 2018-11-06 | [
[
"Benone",
"Carolina L.",
""
],
[
"Crispino",
"Luís C. B.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Richartz",
"Maurício",
""
]
] | The existence of stationary bound states for the hydrodynamic velocity field between two concentric cylinders is established. We argue that rotational motion, together with a trapping mechanism for the associated field, is sufficient to mitigate energy dissipation between the cylinders, thus allowing the existence of i... |
0901.2423 | Giovanni Arcioni | Giovanni Arcioni, Antoine Suarez | At World's End: Where Complementarity and Irreversibility meet in the
Black Hole | 5 pages, 4 figures | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is argued that a slight modification of the complementarity principle may
help to overcome paradoxes about the observer who falls through the event
horizon
| [
{
"created": "Fri, 16 Jan 2009 16:05:03 GMT",
"version": "v1"
}
] | 2009-01-19 | [
[
"Arcioni",
"Giovanni",
""
],
[
"Suarez",
"Antoine",
""
]
] | It is argued that a slight modification of the complementarity principle may help to overcome paradoxes about the observer who falls through the event horizon |
1003.3120 | George Lukes Gerakopoulos | Georgios Lukes-Gerakopoulos, Theocharis A. Apostolatos, George
Contopoulos | An observable signature of a background deviating from Kerr | 25 pages, 15 figures | Phys.Rev.D81:124005,2010 | 10.1103/PhysRevD.81.124005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By detecting gravitational wave signals from extreme mass ratio inspiraling
sources (EMRIs) we will be given the opportunity to check our theoretical
expectations regarding the nature of supermassive bodies that inhabit the
central regions of galaxies. We have explored some qualitatively new features
that a perturbed... | [
{
"created": "Tue, 16 Mar 2010 10:32:35 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Lukes-Gerakopoulos",
"Georgios",
""
],
[
"Apostolatos",
"Theocharis A.",
""
],
[
"Contopoulos",
"George",
""
]
] | By detecting gravitational wave signals from extreme mass ratio inspiraling sources (EMRIs) we will be given the opportunity to check our theoretical expectations regarding the nature of supermassive bodies that inhabit the central regions of galaxies. We have explored some qualitatively new features that a perturbed K... |
1712.04342 | Kirill Bronnikov | K.A. Bronnikov | Comment on "Construction of regular black holes in general relativity" | 3 pages, no figures. arXiv admin note: text overlap with
arXiv:1708.08125 | Phys. Rev. D 96 (12), 128501 (2017) | 10.1103/PhysRevD.96.128501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is claimed that the paper by Zhong-Ying Fan and Xiaobao Wang [Phys. Rev. D
94, 124027 (2016), arXiv: 1610.02636] on nonlinear electrodynamics coupled to
general relativity, being correct in general, in some respects repeats
previously obtained results without giving proper references. There is also an
important po... | [
{
"created": "Sun, 10 Dec 2017 19:46:45 GMT",
"version": "v1"
}
] | 2017-12-13 | [
[
"Bronnikov",
"K. A.",
""
]
] | It is claimed that the paper by Zhong-Ying Fan and Xiaobao Wang [Phys. Rev. D 94, 124027 (2016), arXiv: 1610.02636] on nonlinear electrodynamics coupled to general relativity, being correct in general, in some respects repeats previously obtained results without giving proper references. There is also an important poin... |
0906.1570 | Claudio Simeone | Martin G. Richarte and Claudio Simeone | More about thin-shell wormholes associated to cosmic strings | 8 pages; accepted for publication in Physical Review D | Phys.Rev.D79:127502,2009 | 10.1103/PhysRevD.79.127502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous analysis about thin-shell wormholes associated to cosmic strings are
extended. More evidence is found supporting the conjecture that, under
reasonable assumptions about the equations of state of matter on the shell, the
configurations are not stable under radial velocity perturbations.
| [
{
"created": "Mon, 8 Jun 2009 19:35:09 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Richarte",
"Martin G.",
""
],
[
"Simeone",
"Claudio",
""
]
] | Previous analysis about thin-shell wormholes associated to cosmic strings are extended. More evidence is found supporting the conjecture that, under reasonable assumptions about the equations of state of matter on the shell, the configurations are not stable under radial velocity perturbations. |
2007.04354 | Abdulrahim Al Balushi | Michael T.N. Imseis, Abdulrahim Al Balushi, Robert B. Mann | Null Hypersurfaces in Kerr-Newman-AdS Black Hole and Super-Entropic
Black Hole Spacetimes | some figures updated | null | 10.1088/1361-6382/abd3e0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A three-dimensional light-like foliation of a spacetime geometry is one
particular way of studying its light cone structure and has important
applications in numerical relativity. In this paper, we execute such a
foliation for the Kerr-Newman-AdS black hole geometry and compare it with the
lightlike foliations of the... | [
{
"created": "Wed, 8 Jul 2020 18:17:49 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 2020 15:06:47 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Imseis",
"Michael T. N.",
""
],
[
"Balushi",
"Abdulrahim Al",
""
],
[
"Mann",
"Robert B.",
""
]
] | A three-dimensional light-like foliation of a spacetime geometry is one particular way of studying its light cone structure and has important applications in numerical relativity. In this paper, we execute such a foliation for the Kerr-Newman-AdS black hole geometry and compare it with the lightlike foliations of the K... |
2309.05696 | Ashish Kumar Meena | Ashish Kumar Meena and Prasenjit Saha | What are the parities of photon-ring images near a black hole? | 11 pages. 7 figures. 3 appendix. Accepted in OJA | null | 10.21105/astro.2309.05696 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Light that grazes a black-hole event horizon can loop around one or more
times before escaping again, resulting for distance observers in an infinite
sequence of ever fainter and more delayed images near the black hole shadow. In
the case of the M87 and Sgr A$^*$ back holes, the first of these so-called
photon-ring i... | [
{
"created": "Mon, 11 Sep 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 09:22:30 GMT",
"version": "v2"
}
] | 2024-01-02 | [
[
"Meena",
"Ashish Kumar",
""
],
[
"Saha",
"Prasenjit",
""
]
] | Light that grazes a black-hole event horizon can loop around one or more times before escaping again, resulting for distance observers in an infinite sequence of ever fainter and more delayed images near the black hole shadow. In the case of the M87 and Sgr A$^*$ back holes, the first of these so-called photon-ring ima... |
gr-qc/9904067 | Friedrich W. Hehl | Yuri N. Obukhov (Moscow/Cologne) and Friedrich W. Hehl (Cologne) | Spacetime metric from linear electrodynamics | 4 pages' latex-script | Phys.Lett. B458 (1999) 466-470 | 10.1016/S0370-2693(99)00643-7 | Cologne-THP-H-99/03 | gr-qc hep-th | null | The Maxwell equations are formulated on an arbitrary (1+3)-dimensional
manifold. Then, imposing a (constrained) linear constitutive relation between
electromagnetic field $(E,B)$ and excitation $({\cal D},{\cal H})$, we derive
the metric of spacetime therefrom.
| [
{
"created": "Mon, 26 Apr 1999 21:52:21 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 1999 14:04:37 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Obukhov",
"Yuri N.",
"",
"Moscow/Cologne"
],
[
"Hehl",
"Friedrich W.",
"",
"Cologne"
]
] | The Maxwell equations are formulated on an arbitrary (1+3)-dimensional manifold. Then, imposing a (constrained) linear constitutive relation between electromagnetic field $(E,B)$ and excitation $({\cal D},{\cal H})$, we derive the metric of spacetime therefrom. |
2403.14164 | Shao-Wen Wei | Ke Chen, Shao-Wen Wei | Motion of spinning particles around a polymer black hole in loop quantum
gravity | 11 pages, 12 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the curved spacetime background, the trajectory of a spinning test
particle will deviate from the geodesic. Using the effective potential method,
we study the motion of a spinning test particle on the equatorial plane of a
polymer black hole in loop quantum gravity described by the
Mathisson-Papapetrou-Dixon equat... | [
{
"created": "Thu, 21 Mar 2024 06:33:10 GMT",
"version": "v1"
}
] | 2024-03-22 | [
[
"Chen",
"Ke",
""
],
[
"Wei",
"Shao-Wen",
""
]
] | In the curved spacetime background, the trajectory of a spinning test particle will deviate from the geodesic. Using the effective potential method, we study the motion of a spinning test particle on the equatorial plane of a polymer black hole in loop quantum gravity described by the Mathisson-Papapetrou-Dixon equatio... |
gr-qc/9907095 | Sawa Manoff | Sawa Manoff | Conformal derivative and conformal transports over spaces with an affine
connection and metrics | 17 pages, LaTeX, submitted for publication in Intern. J. of Math.
Phys., Nonlinear Phenomena and Group Theory | Int.J.Mod.Phys. A15 (2000) 679-696 | 10.1142/S0217751X00000343 | null | gr-qc | null | Transports preserving the angle between two contravariant vector fields but
changing their lengths proportional to their own lengths are introduced as
`conformal' transports and investigated over spaces with one affine connection
and metric. They are more general than the Fermi-Walker transports. In an
analogous way ... | [
{
"created": "Wed, 28 Jul 1999 08:49:55 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Oct 2000 07:43:00 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Manoff",
"Sawa",
""
]
] | Transports preserving the angle between two contravariant vector fields but changing their lengths proportional to their own lengths are introduced as `conformal' transports and investigated over spaces with one affine connection and metric. They are more general than the Fermi-Walker transports. In an analogous way as... |
1512.03137 | Eric Thrane | Eric Thrane, Russell P Anderson, Yuri Levin and Lincoln D Turner | Suspending test masses in terrestrial millihertz gravitational-wave
detectors: a case study with a magnetic assisted torsion pendulum | 6 pages, 4 figures | null | null | null | gr-qc astro-ph.IM physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current terrestrial gravitational-wave detectors operate at frequencies above
10 Hz. There is strong astrophysical motivation to construct low-frequency
gravitational-wave detectors capable of observing 10 mHz - 10Hz signals. While
space-based detectors provide one means of achieving this end, one may also
consider t... | [
{
"created": "Thu, 10 Dec 2015 04:38:32 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 11:53:13 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Mar 2017 00:49:46 GMT",
"version": "v3"
}
] | 2017-03-27 | [
[
"Thrane",
"Eric",
""
],
[
"Anderson",
"Russell P",
""
],
[
"Levin",
"Yuri",
""
],
[
"Turner",
"Lincoln D",
""
]
] | Current terrestrial gravitational-wave detectors operate at frequencies above 10 Hz. There is strong astrophysical motivation to construct low-frequency gravitational-wave detectors capable of observing 10 mHz - 10Hz signals. While space-based detectors provide one means of achieving this end, one may also consider ter... |
gr-qc/0512064 | Nadja Magalh\~aes Sim\~ao | Nadja S. Magalhaes, Rubem M. Marinho Jr., Odylio D. Aguiar, C. Frajuca | Can lightning be a noise source for a spherical gravitational wave
antenna? | 5 pages, 6 figures | Phys.Rev. D72 (2005) 102003 | 10.1103/PhysRevD.72.102003 | null | gr-qc | null | The detection of gravitational waves is a very active research field at the
moment. In Brazil the gravitational wave detector is called Mario SCHENBERG.
Due to its high sensitivity it is necessary to model mathematically all known
noise sources so that digital filters can be developed that maximize the
signal-to-nois... | [
{
"created": "Sun, 11 Dec 2005 16:15:29 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Magalhaes",
"Nadja S.",
""
],
[
"Marinho",
"Rubem M.",
"Jr."
],
[
"Aguiar",
"Odylio D.",
""
],
[
"Frajuca",
"C.",
""
]
] | The detection of gravitational waves is a very active research field at the moment. In Brazil the gravitational wave detector is called Mario SCHENBERG. Due to its high sensitivity it is necessary to model mathematically all known noise sources so that digital filters can be developed that maximize the signal-to-noise ... |
gr-qc/0103090 | Evgeny Sorkin | Evgeny Sorkin and Tsvi Piran | Formation and Evaporation of Charged Black Holes | 23 pages, 7 eps figures, RevTex, accepted for publication in Phys.
Rev. D | Phys.Rev.D63:124024,2001 | 10.1103/PhysRevD.63.124024 | null | gr-qc | null | We investigate the dynamical formation and evaporation of a spherically
symmetric charged black hole. We study the self-consistent one loop order
semiclassical back-reaction problem. To this end the mass-evaporation is
modeled by an expectation value of the stress-energy tensor of a neutral
massless scalar field, whi... | [
{
"created": "Sun, 25 Mar 2001 08:02:15 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Sorkin",
"Evgeny",
""
],
[
"Piran",
"Tsvi",
""
]
] | We investigate the dynamical formation and evaporation of a spherically symmetric charged black hole. We study the self-consistent one loop order semiclassical back-reaction problem. To this end the mass-evaporation is modeled by an expectation value of the stress-energy tensor of a neutral massless scalar field, while... |
2107.00917 | Alexander Kamenshchik | Alexander Yu. Kamenshchik, Jeinny Nallely Perez Rodriguez and Tereza
Vardanyan | Time and Evolution in Quantum and Classical Cosmology | 30 pages, published in Universe 7, 219 (2021) in the Special Issue on
"Quantum Cosmology", Ed. Paulo Vargas Moniz | Universe 7, 219 (2021) | 10.3390/universe7070219 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the issue of dynamical evolution and time in quantum cosmology. We
emphasize the problem of choice of phase space variables that can play the role
of a time parameter in such a way that for expectation values of quantum
operators the classical evolution is reproduced. We show that it is neither
necessary n... | [
{
"created": "Fri, 2 Jul 2021 09:17:55 GMT",
"version": "v1"
}
] | 2021-07-05 | [
[
"Kamenshchik",
"Alexander Yu.",
""
],
[
"Rodriguez",
"Jeinny Nallely Perez",
""
],
[
"Vardanyan",
"Tereza",
""
]
] | We analyze the issue of dynamical evolution and time in quantum cosmology. We emphasize the problem of choice of phase space variables that can play the role of a time parameter in such a way that for expectation values of quantum operators the classical evolution is reproduced. We show that it is neither necessary nor... |
gr-qc/0210035 | Thomas Waters | Brien C Nolan and Thomas J Waters | Cauchy horizon stability in self-similar collapse: scalar radiation | 10 pages. To appear in Phys Rev D | Phys.Rev.D66:104012,2002 | 10.1103/PhysRevD.66.104012 | null | gr-qc | null | The stability of the Cauchy horizon in spherically symmetric self-similar
collapse is studied by determining the flux of scalar radiation impinging on
the horizon. This flux is found to be finite.
| [
{
"created": "Fri, 11 Oct 2002 16:09:20 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Nolan",
"Brien C",
""
],
[
"Waters",
"Thomas J",
""
]
] | The stability of the Cauchy horizon in spherically symmetric self-similar collapse is studied by determining the flux of scalar radiation impinging on the horizon. This flux is found to be finite. |
2404.01262 | Artem Talanov | Yoong S. Phang and Artem V. Talanov | Engineered Graviton Condensates in a Room-Temperature Superconductor for
a Unified Quantum Fibonacci Field Theory | 21 pages, 19 figures. This an April Fools submission following the
tradition of joke papers on arXiv for April Fools | null | null | null | gr-qc cond-mat.supr-con quant-ph | http://creativecommons.org/licenses/by/4.0/ | In the quest to unify quantum mechanics with general relativity, the concept
of gravitons as quantum carriers of gravitational force stands as a pivotal yet
unproven hypothesis. This work pioneers a bold approach to graviton
condensation via an innovative ambient superconductor, synthesized through a
groundbreaking y... | [
{
"created": "Mon, 1 Apr 2024 17:34:22 GMT",
"version": "v1"
}
] | 2024-04-02 | [
[
"Phang",
"Yoong S.",
""
],
[
"Talanov",
"Artem V.",
""
]
] | In the quest to unify quantum mechanics with general relativity, the concept of gravitons as quantum carriers of gravitational force stands as a pivotal yet unproven hypothesis. This work pioneers a bold approach to graviton condensation via an innovative ambient superconductor, synthesized through a groundbreaking yet... |
gr-qc/0312029 | Hongbao Zhang | Hongbao Zhang, Zhoujian Cao, Xuefei Gong and Wei Zhou | Quasinormal modes for Weyl neutrino field in R-N black holes | 13 pages, 4 figures, and 2 tables, references added, typos corrected,
accepted for publication in Classical and Quantum Gravity | Class.Quant.Grav. 21 (2004) 917-926 | 10.1088/0264-9381/21/4/011 | null | gr-qc | null | We employ WKB approximation up to the third order to determine the low-lying
quasinormal modes for Weyl neutrino field in R-N black holes, which are the
most relevant to the evolution of the field around a black hole in the
intermediate stage. It is showed that the quasinormal mode frequencies for Weyl
neutrino field... | [
{
"created": "Thu, 4 Dec 2003 14:47:48 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2003 04:12:46 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Zhang",
"Hongbao",
""
],
[
"Cao",
"Zhoujian",
""
],
[
"Gong",
"Xuefei",
""
],
[
"Zhou",
"Wei",
""
]
] | We employ WKB approximation up to the third order to determine the low-lying quasinormal modes for Weyl neutrino field in R-N black holes, which are the most relevant to the evolution of the field around a black hole in the intermediate stage. It is showed that the quasinormal mode frequencies for Weyl neutrino field i... |
2104.00555 | Jens Boos | Jens Boos | Non-singular "Gauss" black hole from non-locality: a simple model with a
de Sitter core, mass gap, and no inner horizon | 11 pages, 2 figures; fixed a typo in Eq.(4), added references and
additional discussion. Extended version of an Essay written for the Gravity
Research Foundation 2021 Awards for Essays on Gravitation | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cutting out an infinite tube around $r=0$ formally removes the Schwarzschild
singularity, but without a physical mechanism this procedure seems ad hoc and
artificial. In this Essay we provide such a mechanism by means of non-locality.
Motivated by the Gauss law we define a suitable radius variable as the inverse
of a... | [
{
"created": "Thu, 1 Apr 2021 15:30:02 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Apr 2021 19:24:06 GMT",
"version": "v2"
}
] | 2021-04-07 | [
[
"Boos",
"Jens",
""
]
] | Cutting out an infinite tube around $r=0$ formally removes the Schwarzschild singularity, but without a physical mechanism this procedure seems ad hoc and artificial. In this Essay we provide such a mechanism by means of non-locality. Motivated by the Gauss law we define a suitable radius variable as the inverse of a r... |
1112.5308 | Laur J\"arv | Laur J\"arv, Piret Kuusk, Margus Saal | Scalar-tensor cosmologies with dust matter in the general relativity
limit | 15 pages | null | 10.1103/PhysRevD.85.064013 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider flat Friedmann-Lema\^{\i}tre-Robertson-Walker cosmological models
in the framework of general scalar-tensor theories of gravity with arbitrary
coupling functions, set in the Jordan frame, in the cosmological epoch when the
energy density of the ordinary dust matter dominates over the energy density of
the... | [
{
"created": "Thu, 22 Dec 2011 13:50:43 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Järv",
"Laur",
""
],
[
"Kuusk",
"Piret",
""
],
[
"Saal",
"Margus",
""
]
] | We consider flat Friedmann-Lema\^{\i}tre-Robertson-Walker cosmological models in the framework of general scalar-tensor theories of gravity with arbitrary coupling functions, set in the Jordan frame, in the cosmological epoch when the energy density of the ordinary dust matter dominates over the energy density of the s... |
gr-qc/0204047 | Kazuya Koyama | Kazuya Koyama | Radion and Large Scale Anisotropy on the Brane | Improved version to appear in PRD, Results and conclusions unchanged | Phys.Rev. D66 (2002) 084003 | 10.1103/PhysRevD.66.084003 | UTAP-413 | gr-qc astro-ph hep-th | null | We investigate the effect of the radion on cosmological perturbations in the
brane world. The S^1/Z_2 compactified 5D Anti-de Sitter spacetime bounded by
positive and negative tension branes is considered. The radion is the relative
displacement of the branes in this model. We find two different kinds of the
radion a... | [
{
"created": "Sun, 14 Apr 2002 06:57:07 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 2002 19:00:08 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Koyama",
"Kazuya",
""
]
] | We investigate the effect of the radion on cosmological perturbations in the brane world. The S^1/Z_2 compactified 5D Anti-de Sitter spacetime bounded by positive and negative tension branes is considered. The radion is the relative displacement of the branes in this model. We find two different kinds of the radion at ... |
2304.12563 | Torben Frost | Torben C. Frost | Gravitational Lensing of Massive Particles in the Charged NUT Spacetime | 53 pages, 16 figures, extends parts of the work in arXiv:2112.10260
to massive particles | Phys. Rev. D 108, 124019 (2023) | 10.1103/PhysRevD.108.124019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In astronomy gravitational lensing of light leads to the formation of
multiple images, arcs, Einstein rings, and, most important, the shadow of black
holes. Analogously in the vicinity of a massive compact object massive
particles, following timelike geodesics, are gravitationally lensed. So far
gravitational lensing... | [
{
"created": "Tue, 25 Apr 2023 04:12:33 GMT",
"version": "v1"
}
] | 2023-12-25 | [
[
"Frost",
"Torben C.",
""
]
] | In astronomy gravitational lensing of light leads to the formation of multiple images, arcs, Einstein rings, and, most important, the shadow of black holes. Analogously in the vicinity of a massive compact object massive particles, following timelike geodesics, are gravitationally lensed. So far gravitational lensing o... |
2111.14475 | Yakov Shnir | Carlos Herdeiro, Ilya Perapechka, Eugen Radu, and Yakov Shnir | Spinning gauged boson and Dirac stars: a comparative study | 11 pages, 6 figures. Accepted in Phys. Lett. B | null | 10.1016/j.physletb.2021.136811 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar boson stars and Dirac stars are solitonic solutions of the
Einstein{Klein-Gordon and Einstein- Dirac classical equations, respectively.
Despite the different bosonic vs: fermionic nature of the matter field, these
solutions to the classical field equations have been shown to have
qualitatively similar features... | [
{
"created": "Mon, 29 Nov 2021 11:41:33 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Herdeiro",
"Carlos",
""
],
[
"Perapechka",
"Ilya",
""
],
[
"Radu",
"Eugen",
""
],
[
"Shnir",
"Yakov",
""
]
] | Scalar boson stars and Dirac stars are solitonic solutions of the Einstein{Klein-Gordon and Einstein- Dirac classical equations, respectively. Despite the different bosonic vs: fermionic nature of the matter field, these solutions to the classical field equations have been shown to have qualitatively similar features [... |
2211.06076 | Konstantinos Dialektopoulos F. | Konstantinos F. Dialektopoulos, Jackson Levi Said, Zinovia
Oikonomopoulou | Dynamical systems in Einstein Gauss-Bonnet gravity | 14 pages, 13 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we explore the dynamical system phase space of
Einstein-Gauss-Bonnet theory in the cosmological minisuperspace. This approach
binds the main features of the theory through a system of autonomous
differential equations, in the context of a flat
Friedmann-Lema\^{i}tre-Robertson-Walker spacetime. We analyze... | [
{
"created": "Fri, 11 Nov 2022 09:14:34 GMT",
"version": "v1"
}
] | 2022-11-14 | [
[
"Dialektopoulos",
"Konstantinos F.",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Oikonomopoulou",
"Zinovia",
""
]
] | In this work we explore the dynamical system phase space of Einstein-Gauss-Bonnet theory in the cosmological minisuperspace. This approach binds the main features of the theory through a system of autonomous differential equations, in the context of a flat Friedmann-Lema\^{i}tre-Robertson-Walker spacetime. We analyze t... |
gr-qc/0301049 | B. S. Sathyaprakash | B.S. Sathyaprakash and B.F. Schutz (Cardiff University and MPI for
Gravitational Physics) | Templates for stellar mass black holes falling into supermassive black
holes | 12 pages, 4 Tables, 4th LISA symposium, submitted to CQG | Class.Quant.Grav.20:S209-S218,2003 | 10.1088/0264-9381/20/10/324 | null | gr-qc | null | The spin modulated gravitational wave signals, which we shall call smirches,
emitted by stellar mass black holes tumbling and inspiralling into massive
black holes have extremely complicated shapes. Tracking these signals with the
aid of pattern matching techniques, such as Wiener filtering, is likely to be
computati... | [
{
"created": "Wed, 15 Jan 2003 13:13:59 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sathyaprakash",
"B. S.",
"",
"Cardiff University and MPI for\n Gravitational Physics"
],
[
"Schutz",
"B. F.",
"",
"Cardiff University and MPI for\n Gravitational Physics"
]
] | The spin modulated gravitational wave signals, which we shall call smirches, emitted by stellar mass black holes tumbling and inspiralling into massive black holes have extremely complicated shapes. Tracking these signals with the aid of pattern matching techniques, such as Wiener filtering, is likely to be computation... |
1912.08225 | Baofei Li | Bao-Fei Li, Parampreet Singh, Anzhong Wang | Primordial power spectrum from the dressed metric approach in loop
cosmologies | Revised version with added discussion. References added. To appear in
PRD | Phys. Rev. D 101, 086004 (2020) | 10.1103/PhysRevD.101.086004 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the consequences of different regularizations and ambiguities
in loop cosmological models on the predictions in the scalar and tensor
primordial spectrum of the cosmic microwave background using the dressed metric
approach. Three models, standard loop quantum cosmology (LQC), and two modified
loop quan... | [
{
"created": "Tue, 17 Dec 2019 19:02:58 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2019 19:48:30 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Mar 2020 21:20:13 GMT",
"version": "v3"
}
] | 2020-04-08 | [
[
"Li",
"Bao-Fei",
""
],
[
"Singh",
"Parampreet",
""
],
[
"Wang",
"Anzhong",
""
]
] | We investigate the consequences of different regularizations and ambiguities in loop cosmological models on the predictions in the scalar and tensor primordial spectrum of the cosmic microwave background using the dressed metric approach. Three models, standard loop quantum cosmology (LQC), and two modified loop quantu... |
2302.11189 | Xiangdong Zhang | Yongbin Du and Xiangdong Zhang | Topological classes of BTZ black holes | 10 pages and 5 figures; v2, references updated | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the recent paper [Phys. Rev. Lett. 129, 191101 (2022)], the black holes
were viewed as topological thermodynamic defects by using the generalized
off-shell free energy. Their work indicates that all black hole solutions in
the pure Einstein-Maxwell gravity theory could be classified into three
different topologica... | [
{
"created": "Wed, 22 Feb 2023 07:52:21 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2023 03:59:05 GMT",
"version": "v2"
}
] | 2023-02-24 | [
[
"Du",
"Yongbin",
""
],
[
"Zhang",
"Xiangdong",
""
]
] | In the recent paper [Phys. Rev. Lett. 129, 191101 (2022)], the black holes were viewed as topological thermodynamic defects by using the generalized off-shell free energy. Their work indicates that all black hole solutions in the pure Einstein-Maxwell gravity theory could be classified into three different topological ... |
1805.03467 | Diego S\'aez-Chill\'on G\'omez | Yi Zhong and Diego Saez-Chillon Gomez | Inflation in mimetic f(G) gravity | 14 pages, 2 figures | Symmetry 2018, 10(5), 170 | 10.3390/sym10050170 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mimetic gravity is analysed in the framework of some extensions of General
Relativity, where a function of the Gauss-Bonnet invariant in four dimensions
is considered. By assuming the so-called mimetic condition, the conformal
degree of freedom is isolated and a pressureless fluid naturally arises. Then,
the complete... | [
{
"created": "Wed, 9 May 2018 12:10:26 GMT",
"version": "v1"
}
] | 2018-05-22 | [
[
"Zhong",
"Yi",
""
],
[
"Gomez",
"Diego Saez-Chillon",
""
]
] | Mimetic gravity is analysed in the framework of some extensions of General Relativity, where a function of the Gauss-Bonnet invariant in four dimensions is considered. By assuming the so-called mimetic condition, the conformal degree of freedom is isolated and a pressureless fluid naturally arises. Then, the complete s... |
1201.4226 | Iosif Khriplovich | I. B. Khriplovich | Gravitational four-fermion interaction on the Planck scale | 4 pages, few comments added | null | 10.1016/j.physletb.2012.01.072 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The four-fermion gravitational interaction is induced by torsion, and gets
essential on the Planck scale. On this scale, the axial-axial contribution
dominates strongly in the discussed interaction. The energy-momentum tensor,
generated by this contribution, is analyzed, as well as stability of the
problem with respe... | [
{
"created": "Fri, 20 Jan 2012 08:18:58 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2012 08:00:36 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Khriplovich",
"I. B.",
""
]
] | The four-fermion gravitational interaction is induced by torsion, and gets essential on the Planck scale. On this scale, the axial-axial contribution dominates strongly in the discussed interaction. The energy-momentum tensor, generated by this contribution, is analyzed, as well as stability of the problem with respect... |
2112.13198 | Kirill Bronnikov | Kirill A. Bronnikov, Rahul Kumar Walia | Field sources for Simpson-Visser space-times | null | Phys. Rev. D 15, 044039 (2022) | 10.1103/PhysRevD.105.044039 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simpson-Visser (SV) space-times are the simplest globally regular
modifications of the Schwarzschild, Reissner-Nordstrom and other blak-hole
solutions of general relativity. They smoothly interpolate between these black
holes and traversable wormholes. After a brief presentation of the
Schwarzschild-like and Reissner... | [
{
"created": "Sat, 25 Dec 2021 07:26:39 GMT",
"version": "v1"
}
] | 2022-09-16 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Walia",
"Rahul Kumar",
""
]
] | Simpson-Visser (SV) space-times are the simplest globally regular modifications of the Schwarzschild, Reissner-Nordstrom and other blak-hole solutions of general relativity. They smoothly interpolate between these black holes and traversable wormholes. After a brief presentation of the Schwarzschild-like and Reissner-N... |
gr-qc/9411023 | null | Bruce Allen | Maximally Symmetric Spin-Two Bitensors on $S^3$ and $H^3$ | 12 pages, RevTeX, uuencoded compressed .tex file, minor typos
corrected | Phys.Rev. D51 (1995) 5491-5497 | 10.1103/PhysRevD.51.5491 | WISC-MILW-94-TH-25 | gr-qc | null | The transverse traceless spin-two tensor harmonics on $S^3$ and $H^3$ may be
denoted by $T^{(kl)}{}_{ab}$. The index $k$ labels the (degenerate) eigenvalues
of the Laplacian $\square$ and $l$ the other indices. We compute the bitensor
$\sum_l T^{(kl)}{}_{ab}(x) T^{(kl)}{}_{a'b'}(x')^*$ where $x,x'$ are distinct
point... | [
{
"created": "Tue, 8 Nov 1994 18:46:00 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 1994 15:25:00 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Allen",
"Bruce",
""
]
] | The transverse traceless spin-two tensor harmonics on $S^3$ and $H^3$ may be denoted by $T^{(kl)}{}_{ab}$. The index $k$ labels the (degenerate) eigenvalues of the Laplacian $\square$ and $l$ the other indices. We compute the bitensor $\sum_l T^{(kl)}{}_{ab}(x) T^{(kl)}{}_{a'b'}(x')^*$ where $x,x'$ are distinct points ... |
0906.0235 | Branislav Cvetkovi\'c | M. Blagojevi\'c, B. Cvetkovi\'c and O. Miskovi\'c | Nonlinear electrodynamics in 3D gravity with torsion | LATEX, 16 pages, v2: minor corrections | Phys.Rev.D80:024043,2009 | 10.1103/PhysRevD.80.024043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study exact solutions of nonlinear electrodynamics coupled to
three-dimensional gravity with torsion. We show that in any static and
spherically symmetric configuration, at least one component of the
electromagnetic field has to vanish. In the electric sector of the theory, we
construct an exact solution, characte... | [
{
"created": "Mon, 1 Jun 2009 08:29:19 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Aug 2009 22:46:44 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Blagojević",
"M.",
""
],
[
"Cvetković",
"B.",
""
],
[
"Misković",
"O.",
""
]
] | We study exact solutions of nonlinear electrodynamics coupled to three-dimensional gravity with torsion. We show that in any static and spherically symmetric configuration, at least one component of the electromagnetic field has to vanish. In the electric sector of the theory, we construct an exact solution, characteri... |
2403.08387 | Fech Scen Khoo | Bahareh Azad, Jose Luis Bl\'azquez-Salcedo, Fech Scen Khoo, Jutta Kunz | Radial perturbations of Ellis-Bronnikov wormholes in slow rotation up to
second order | 27 pages, 8 figures | Phys. Rev. D 109, 124051 (2024) | 10.1103/PhysRevD.109.124051 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider slowly rotating Ellis-Bronnikov wormholes and investigate their
radial perturbations ($\mathrm{l}=0$), expanding up to second order in
rotation. We present the detailed derivations in the general case, including
symmetric and non-symmetric wormholes. The calculations show that the unstable
mode present in... | [
{
"created": "Wed, 13 Mar 2024 09:53:21 GMT",
"version": "v1"
}
] | 2024-06-25 | [
[
"Azad",
"Bahareh",
""
],
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Khoo",
"Fech Scen",
""
],
[
"Kunz",
"Jutta",
""
]
] | We consider slowly rotating Ellis-Bronnikov wormholes and investigate their radial perturbations ($\mathrm{l}=0$), expanding up to second order in rotation. We present the detailed derivations in the general case, including symmetric and non-symmetric wormholes. The calculations show that the unstable mode present in t... |
1804.06730 | Richard Petti | R. J. Petti | Translational Spacetime Symmetries in Gravitational Theories | 16 pages, 1 table, 1 figure. Published in Classical and Quantum
Gravity, 23 (2006) p 737-751. This version makes two changes to the version
published in Class. Quantum Grav. (1) It corrects equation (10) in section
2.7 by including a term that was omitted. (2) It has a a table of contents at
the end that was no... | Class. Quantum Grav. 23 (2006) 737-751 | 10.1088/0264-9381/23/3/012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | How to include spacetime translations in fibre bundle gauge theories has been
a subject of controversy, because spacetime symmetries are not internal
symmetries of the bundle structure group. The standard method for including
affine symmetry in differential geometry is to define a Cartan connection on an
affine bundl... | [
{
"created": "Mon, 16 Apr 2018 18:24:18 GMT",
"version": "v1"
}
] | 2018-04-25 | [
[
"Petti",
"R. J.",
""
]
] | How to include spacetime translations in fibre bundle gauge theories has been a subject of controversy, because spacetime symmetries are not internal symmetries of the bundle structure group. The standard method for including affine symmetry in differential geometry is to define a Cartan connection on an affine bundle ... |
gr-qc/9611028 | Jose Acacio de Barros | J. Acacio de Barros (Physics Department/UFJF, Brazil) and N.
Pinto-Neto (CBPF/Lafex, Brazil) | The Causal Interpretation of Quantum Mechanics and The Singularity
Problem in Quantum Cosmology | 18 pages, LaTeX | Nucl.Phys.Proc.Suppl. 57 (1997) 247-250 | 10.1016/S0920-5632(97)00396-4 | null | gr-qc quant-ph | null | We apply the causal interpretation of quantum mechanics to homogeneous
quantum cosmology and show that the quantum theory is independent of any
time-gauge choice and there is no issue of time. We exemplify this result by
studying a particular minisuperspace model where the quantum potential driven
by a prescribed qua... | [
{
"created": "Mon, 11 Nov 1996 19:05:53 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"de Barros",
"J. Acacio",
"",
"Physics Department/UFJF, Brazil"
],
[
"Pinto-Neto",
"N.",
"",
"CBPF/Lafex, Brazil"
]
] | We apply the causal interpretation of quantum mechanics to homogeneous quantum cosmology and show that the quantum theory is independent of any time-gauge choice and there is no issue of time. We exemplify this result by studying a particular minisuperspace model where the quantum potential driven by a prescribed quant... |
1209.6324 | Nikolai V. Mitskievich | Nikolai V. Mitskievich | On eternal black holes and some interior solutions | 19 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we deduce two new exact solutions of Einstein's equations for
eternal black holes, now related to stiff matter, one `static' and another
rotating (stationary like the Kerr one), thus the number of these eternal
solutions grows from four to six. Dealing with these static and rotating
solutions we autom... | [
{
"created": "Thu, 27 Sep 2012 18:33:29 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2012 17:54:47 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Oct 2012 19:56:13 GMT",
"version": "v3"
}
] | 2012-10-19 | [
[
"Mitskievich",
"Nikolai V.",
""
]
] | In this article we deduce two new exact solutions of Einstein's equations for eternal black holes, now related to stiff matter, one `static' and another rotating (stationary like the Kerr one), thus the number of these eternal solutions grows from four to six. Dealing with these static and rotating solutions we automat... |
gr-qc/9811090 | Pierre Teyssandier | C. Bracco and P. Teyssandier | Scintillation in scalar-tensor theories of gravity | 8 pages; to appear in Astronomy and Astrophysics | null | null | null | gr-qc | null | We study the scintillation produced by time-varying gravitational fields
within scalar-tensor theories of gravity. The problem is treated in the
geometrical optics approximation for a very distant light source emitting quasi
plane monochromatic electromagnetic waves. We obtain a general formula giving
the time depend... | [
{
"created": "Thu, 26 Nov 1998 17:09:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bracco",
"C.",
""
],
[
"Teyssandier",
"P.",
""
]
] | We study the scintillation produced by time-varying gravitational fields within scalar-tensor theories of gravity. The problem is treated in the geometrical optics approximation for a very distant light source emitting quasi plane monochromatic electromagnetic waves. We obtain a general formula giving the time dependen... |
1709.06494 | Ettore Minguzzi | E. Minguzzi | Causality theory for closed cone structures with applications | Latex2e, 138 pages. Work presented at the meetings "Non-regular
spacetime geometry", Firenze, June 20-22, 2017, and "Advances in General
Relativity", ESI Vienna, August 28 - September 1, 2017. v3: added distance
formula for stably causal (rather than just stable) spacetimes. v4: Added a
few regularity results, ... | Rev. Math. Phys. 31 (2019) 1930001 | 10.1142/S0129055X19300012 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop causality theory for upper semi-continuous distributions of cones
over manifolds generalizing results from mathematical relativity in two
directions: non-round cones and non-regular differentiability assumptions. We
prove the validity of most results of the regular Lorentzian causality theory
including cau... | [
{
"created": "Tue, 19 Sep 2017 15:55:38 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2017 21:17:45 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Oct 2017 13:55:27 GMT",
"version": "v3"
},
{
"created": "Thu, 6 Dec 2018 19:05:43 GMT",
"version": "v4"
}
] | 2019-03-06 | [
[
"Minguzzi",
"E.",
""
]
] | We develop causality theory for upper semi-continuous distributions of cones over manifolds generalizing results from mathematical relativity in two directions: non-round cones and non-regular differentiability assumptions. We prove the validity of most results of the regular Lorentzian causality theory including causa... |
1504.04223 | Rong-Jia Yang | Rong-Jia Yang | Quantum gravity corrections to accretion onto a Schwarzschild black hole | 7 pages | Phys. Rev. D 92, 084011 (2015) | 10.1103/PhysRevD.92.084011 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum gravity corrections to accretion onto a Schwarzschild black hole are
considered in the context of asymptotically safe scenario. The possible
positions of the critical points are discussed and the general conditions for
critical points are obtained. The explicit expressions for matter density
compression and t... | [
{
"created": "Thu, 16 Apr 2015 13:24:18 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2015 02:16:31 GMT",
"version": "v2"
}
] | 2015-10-20 | [
[
"Yang",
"Rong-Jia",
""
]
] | Quantum gravity corrections to accretion onto a Schwarzschild black hole are considered in the context of asymptotically safe scenario. The possible positions of the critical points are discussed and the general conditions for critical points are obtained. The explicit expressions for matter density compression and tem... |
gr-qc/9412024 | Thibault Damour | T. Damour | General relativity and experiment | 13 pages, LATEX | null | null | IHES/P/94/56 | gr-qc | null | The confrontation between Einstein's theory of gravitation and experiment is
summarized. Although all current experimental data are compatible with general
relativity, the importance of pursuing the quest for possible deviations from
Einstein's theory is emphasized.
| [
{
"created": "Thu, 8 Dec 1994 13:45:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Damour",
"T.",
""
]
] | The confrontation between Einstein's theory of gravitation and experiment is summarized. Although all current experimental data are compatible with general relativity, the importance of pursuing the quest for possible deviations from Einstein's theory is emphasized. |
2204.05054 | Keisuke Nakashi | Keisuke Nakashi, Masashi Kimura, Hayato Motohashi, and Kazufumi
Takahashi | Black hole perturbations in higher-order scalar-tensor theories: initial
value problem and dynamical stability | 35 pages, 13 figures, v2: published version in CQG | Class. Quant. Grav. 39 (2022) no.17, 175003 | 10.1088/1361-6382/ac813e | RUP-22-4, YITP-22-13 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose a physically sensible formulation of initial value problem for
black hole perturbations in higher-order scalar-tensor theories. As a first
application, we study monopole perturbations around stealth Schwarzschild
solutions in a shift- and reflection-symmetric subclass of degenerate
higher-order scalar-tens... | [
{
"created": "Mon, 11 Apr 2022 12:46:41 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2022 02:13:15 GMT",
"version": "v2"
}
] | 2022-08-19 | [
[
"Nakashi",
"Keisuke",
""
],
[
"Kimura",
"Masashi",
""
],
[
"Motohashi",
"Hayato",
""
],
[
"Takahashi",
"Kazufumi",
""
]
] | We propose a physically sensible formulation of initial value problem for black hole perturbations in higher-order scalar-tensor theories. As a first application, we study monopole perturbations around stealth Schwarzschild solutions in a shift- and reflection-symmetric subclass of degenerate higher-order scalar-tensor... |
gr-qc/9710134 | Benjamin J. Owen | Benjamin J. Owen (Caltech), Hideyuki Tagoshi (National Astronomical
Observatory, Mitaka, Japan), Akira Ohashi (Kyoto University) | Non-precessional spin-orbit effects on gravitational waves from
inspiraling compact binaries to second post-Newtonian order | 11 pages, submitted to Phys. Rev. D | Phys.Rev. D57 (1998) 6168-6175 | 10.1103/PhysRevD.57.6168 | null | gr-qc | null | We derive all second post-Newtonian (2PN), non-precessional effects of spin-
orbit coupling on the gravitational wave forms emitted by an inspiraling binary
composed of spinning, compact bodies in a quasicircular orbit. Previous post-
Newtonian calculations of spin-orbit effects (at 1.5PN order) relied on a fluid
des... | [
{
"created": "Fri, 31 Oct 1997 00:04:27 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Owen",
"Benjamin J.",
"",
"Caltech"
],
[
"Tagoshi",
"Hideyuki",
"",
"National Astronomical\n Observatory, Mitaka, Japan"
],
[
"Ohashi",
"Akira",
"",
"Kyoto University"
]
] | We derive all second post-Newtonian (2PN), non-precessional effects of spin- orbit coupling on the gravitational wave forms emitted by an inspiraling binary composed of spinning, compact bodies in a quasicircular orbit. Previous post- Newtonian calculations of spin-orbit effects (at 1.5PN order) relied on a fluid descr... |
gr-qc/0007051 | Luc Blanchet | Luc Blanchet, Guillaume Faye | General relativistic dynamics of compact binaries at the third
post-Newtonian order | 78 pages, submitted to Phys. Rev. D, with minor modifications | Phys.Rev.D63:062005,2001 | 10.1103/PhysRevD.63.062005 | null | gr-qc | null | The general relativistic corrections in the equations of motion and
associated energy of a binary system of point-like masses are derived at the
third post-Newtonian (3PN) order. The derivation is based on a post-Newtonian
expansion of the metric in harmonic coordinates at the 3PN approximation. The
metric is paramet... | [
{
"created": "Thu, 20 Jul 2000 17:08:13 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Nov 2000 19:43:52 GMT",
"version": "v2"
}
] | 2009-12-31 | [
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
]
] | The general relativistic corrections in the equations of motion and associated energy of a binary system of point-like masses are derived at the third post-Newtonian (3PN) order. The derivation is based on a post-Newtonian expansion of the metric in harmonic coordinates at the 3PN approximation. The metric is parametri... |
1905.10767 | Farrukh Fattoyev Jabborovich | F. J. Fattoyev | Neutron stars in general relativity and scalar-tensor theory of gravity | 32 pages, 1 figure, 1 table; Manuscript published in final form in
"Arabian Journal of Mathematics", July 11, 2019 | Arabian Journal of Mathematics, July 11, 2019 | 10.1007/s40065-019-0265-5 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The masses and radii of neutron stars are discussed in general relativity and
scalar-tensor theory of gravity and the differences are compared with the
current uncertainties stemming from the nuclear equation of state in the
relativistic mean-field framework. It is shown that astrophysical and
gravitational waves obs... | [
{
"created": "Sun, 26 May 2019 09:08:52 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jul 2019 04:21:31 GMT",
"version": "v2"
}
] | 2019-07-16 | [
[
"Fattoyev",
"F. J.",
""
]
] | The masses and radii of neutron stars are discussed in general relativity and scalar-tensor theory of gravity and the differences are compared with the current uncertainties stemming from the nuclear equation of state in the relativistic mean-field framework. It is shown that astrophysical and gravitational waves obser... |
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