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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1502.02758 | Matt Visser | Matt Visser (Victoria University of Wellington) | Conformally Friedmann-Lemaitre-Robertson-Walker cosmologies | V1: 17 pages; V2: 20 pages. 5 references added. Additional comments
on local conformal flatness. New section and extra comments
comparing/contrasting with LTB, Swiss-cheese, and timescape cosmologies. No
physics changes. V3: Now 21 pages. 3 references added. Some additional
discussion regarding dynamics. No phy... | Classical and Quantum Gravity 32 (2015) 135007 | 10.1088/0264-9381/32/13/135007 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a universe where, according to the standard cosmological models, some 97%
of the total mass-energy is still "missing in action" it behooves us to spend
at least a little effort critically assessing and exploring radical
alternatives. Among possible, (dare we say plausible), nonstandard but
superficially viable mod... | [
{
"created": "Tue, 10 Feb 2015 02:45:28 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Feb 2015 18:56:01 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Apr 2015 23:58:15 GMT",
"version": "v3"
}
] | 2017-11-28 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | In a universe where, according to the standard cosmological models, some 97% of the total mass-energy is still "missing in action" it behooves us to spend at least a little effort critically assessing and exploring radical alternatives. Among possible, (dare we say plausible), nonstandard but superficially viable model... |
1406.7421 | Cristina Blaga | C. Blaga | Circular time-like geodesics around a charged spherically symmetric
dilaton black hole | 8 pages, 6 figures | Automat. Comput. Appl. Math., 22(2013), 41-49 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we examine the circular time-like geodesics near a spherically
symmetric dilaton black hole, described using the exact solution for a static
charged black hole found by Gibbons and Maeda and, independently, by Garfinkle,
Horowitz and Strominger. The existence and stability of the circular orbits are
anal... | [
{
"created": "Sat, 28 Jun 2014 17:10:33 GMT",
"version": "v1"
}
] | 2014-07-01 | [
[
"Blaga",
"C.",
""
]
] | In this note we examine the circular time-like geodesics near a spherically symmetric dilaton black hole, described using the exact solution for a static charged black hole found by Gibbons and Maeda and, independently, by Garfinkle, Horowitz and Strominger. The existence and stability of the circular orbits are analys... |
2103.10473 | Ugo Moschella | Ugo Moschella, Mario Novello | New dynamical features of pure k-essential cosmologies | null | null | 10.1142/S0218271822500109 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We come back on the dynamical properties of k-essential cosmological models
and show how the interesting phenomenological features of those models are
related to the existence of boundaries in the phase surface. We focus our
attention to the branching points where the energy density has an extremum and
the effective ... | [
{
"created": "Thu, 18 Mar 2021 18:42:11 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2021 19:40:56 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Moschella",
"Ugo",
""
],
[
"Novello",
"Mario",
""
]
] | We come back on the dynamical properties of k-essential cosmological models and show how the interesting phenomenological features of those models are related to the existence of boundaries in the phase surface. We focus our attention to the branching points where the energy density has an extremum and the effective sp... |
gr-qc/9409020 | null | Oleg A. Fonarev | Exact Einstein-scalar field solutions for formation of black holes in a
cosmological setting | 25 pages, 2 figures | Class.Quant.Grav.12:1739-1752,1995 | 10.1088/0264-9381/12/7/016 | null | gr-qc astro-ph hep-th | null | We consider self-interacting scalar fields coupled to gravity. Two classes of
exact solutions to Einstein's equations are obtained: the first class
corresponds to the minimal coupling, the second one to the conformal coupling.
One of the solutions is shown to describe a formation of a black hole in a
cosmological set... | [
{
"created": "Sun, 11 Sep 1994 17:51:00 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Sep 1994 18:58:00 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Sep 1994 19:27:00 GMT",
"version": "v3"
}
] | 2010-04-06 | [
[
"Fonarev",
"Oleg A.",
""
]
] | We consider self-interacting scalar fields coupled to gravity. Two classes of exact solutions to Einstein's equations are obtained: the first class corresponds to the minimal coupling, the second one to the conformal coupling. One of the solutions is shown to describe a formation of a black hole in a cosmological setti... |
gr-qc/0207028 | Roman A. Konoplya | R.A.Konoplya | Decay of charged scalar field around a black hole: quasinormal modes of
R-N, R-N-AdS and dilaton black holes | 10 pages, LaTeX, 4 figures, considerable changes made and wrong
interpretation of computations corrected | Phys.Rev. D66 (2002) 084007 | 10.1103/PhysRevD.66.084007 | null | gr-qc | null | It is well known that the charged scalar perturbations of the
Reissner-Nordstrom metric will decay slower at very late times than the neutral
ones, thereby dominating in the late time signal. We show that at the stage of
quasinormal ringing, on the contrary, the neutral perturbations will decay
slower for RN, RNAdS a... | [
{
"created": "Thu, 4 Jul 2002 13:44:53 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2002 14:51:38 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jul 2002 14:36:48 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Konoplya",
"R. A.",
""
]
] | It is well known that the charged scalar perturbations of the Reissner-Nordstrom metric will decay slower at very late times than the neutral ones, thereby dominating in the late time signal. We show that at the stage of quasinormal ringing, on the contrary, the neutral perturbations will decay slower for RN, RNAdS and... |
2205.07987 | Karl Daningburg | Karl Daningburg and Richard O'Shaughnessy | Cost Minimization in Acquisition for Gravitational Wave Surrogate
Modeling | 8 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave science is dependent upon expensive numerical simulations,
which provide the foundational understanding of binary merger radiation needed
to interpret observations of massive binary black holes. The high cost of these
simulations limits large-scale campaigns to explore the binary black hole
paramet... | [
{
"created": "Mon, 16 May 2022 20:57:59 GMT",
"version": "v1"
}
] | 2022-05-18 | [
[
"Daningburg",
"Karl",
""
],
[
"O'Shaughnessy",
"Richard",
""
]
] | Gravitational wave science is dependent upon expensive numerical simulations, which provide the foundational understanding of binary merger radiation needed to interpret observations of massive binary black holes. The high cost of these simulations limits large-scale campaigns to explore the binary black hole parameter... |
gr-qc/0301103 | Masaru Shibata | Masaru Shibata (Univ. Tokyo) | Axisymmetric general relativistic hydrodynamics: Long-term evolution of
neutron stars and stellar collapse to neutron stars and black holes | 28 pages, to appear in PRD 67, 0440XX (2003) | Phys.Rev. D67 (2003) 024033 | 10.1103/PhysRevD.67.024033 | null | gr-qc astro-ph | null | We report a new implementation for axisymmetric simulation in full general
relativity. In this implementation, the Einstein equations are solved using the
Nakamura-Shibata formulation with the so-called cartoon method to impose an
axisymmetric boundary condition, and the general relativistic hydrodynamic
equations ar... | [
{
"created": "Fri, 24 Jan 2003 18:07:49 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Shibata",
"Masaru",
"",
"Univ. Tokyo"
]
] | We report a new implementation for axisymmetric simulation in full general relativity. In this implementation, the Einstein equations are solved using the Nakamura-Shibata formulation with the so-called cartoon method to impose an axisymmetric boundary condition, and the general relativistic hydrodynamic equations are ... |
gr-qc/0605107 | Kouji Nakamura | Kouji Nakamura | Gauge-invariant Formulation of the Second-order Cosmological
Perturbations | 5 pages, no figure. RevTeX; short letter version of gr-qc/0605108;
some details of explanations are added | Phys.Rev. D74 (2006) 101301 | 10.1103/PhysRevD.74.101301 | null | gr-qc astro-ph hep-ph hep-th math-ph math.MP | null | Gauge invariant treatments of the second order cosmological perturbation in a
four dimensional homogeneous isotropic universe filled with the perfect fluid
are completely formulated without any gauge fixing. We derive all components of
the Einstein equations in the case where the first order vector and tensor
modes a... | [
{
"created": "Fri, 19 May 2006 06:17:04 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Sep 2006 08:33:46 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Nakamura",
"Kouji",
""
]
] | Gauge invariant treatments of the second order cosmological perturbation in a four dimensional homogeneous isotropic universe filled with the perfect fluid are completely formulated without any gauge fixing. We derive all components of the Einstein equations in the case where the first order vector and tensor modes are... |
2302.08104 | Subenoy Chakraborty | Santu Mondal, Roshni Bhaumik, Sourav Dutta, and Subenoy Chakraborty | Multiscalar field cosmological model and possible solutions using
Noether symmetry approach | 12 pages, 3 figures | null | 10.1142/S0217732321502461 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, a cosmological model is considered having two scalar fields
minimally coupled to gravity with a mixed kinetic term. The model is
characterized by the coupling function and the potential function which are
assumed to depend on one of the scalar fields. Instead of choosing these
functions phenomenological... | [
{
"created": "Thu, 16 Feb 2023 06:07:54 GMT",
"version": "v1"
}
] | 2023-02-17 | [
[
"Mondal",
"Santu",
""
],
[
"Bhaumik",
"Roshni",
""
],
[
"Dutta",
"Sourav",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this work, a cosmological model is considered having two scalar fields minimally coupled to gravity with a mixed kinetic term. The model is characterized by the coupling function and the potential function which are assumed to depend on one of the scalar fields. Instead of choosing these functions phenomenologically... |
1412.4189 | Bogeun Gwak | Wha-Keun Ahn, Bogeun Gwak, Bum-Hoon Lee, Wonwoo Lee | Instability of Black Holes with a Gauss-Bonnet Term | 20 pages, 10 figures, published version in EPJC | Eur. Phys. J. C75, no. 8, 372 (2015) | 10.1140/epjc/s10052-015-3568-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the fragmentation instability of hairy black holes in the
theory with a Gauss$-$Bonnet(GB) term in asymptotically flat spacetime. Our
approach is through the non-perturbative fragmentation instability. By this
approach, we investigate whether the initial black hole can be broken into two
black holes by... | [
{
"created": "Sat, 13 Dec 2014 03:39:24 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Sep 2015 17:48:38 GMT",
"version": "v2"
}
] | 2016-02-15 | [
[
"Ahn",
"Wha-Keun",
""
],
[
"Gwak",
"Bogeun",
""
],
[
"Lee",
"Bum-Hoon",
""
],
[
"Lee",
"Wonwoo",
""
]
] | We investigate the fragmentation instability of hairy black holes in the theory with a Gauss$-$Bonnet(GB) term in asymptotically flat spacetime. Our approach is through the non-perturbative fragmentation instability. By this approach, we investigate whether the initial black hole can be broken into two black holes by c... |
2102.09776 | Muhammad Zubair Ali Moughal | Muhammad Zubair Ali Moughal | Generating spiky solutions of Einstein field equations with the Stephani
transformation | PhD thesis. arXiv admin note: text overlap with arXiv:gr-qc/0410126
by other authors | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Geroch/Stephani transformation is a solution-generating transformation,
and may generate spiky solutions. The spikes in solutions generated so far are
either early-time permanent spikes or transient spikes. We want to generate a
solution with a late-time permanent spike. We achieve this by applying the
Stephani t... | [
{
"created": "Fri, 19 Feb 2021 07:36:16 GMT",
"version": "v1"
}
] | 2021-02-22 | [
[
"Moughal",
"Muhammad Zubair Ali",
""
]
] | The Geroch/Stephani transformation is a solution-generating transformation, and may generate spiky solutions. The spikes in solutions generated so far are either early-time permanent spikes or transient spikes. We want to generate a solution with a late-time permanent spike. We achieve this by applying the Stephani tra... |
1602.07520 | Angnis Schmidt-May | Angnis Schmidt-May | Nonlinear interactions for massive spin-2 fields | to appear in the proceedings of the Corfu Summer Institute 2015
"School and Workshops on Elementary Particle Physics and Gravity", 16 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a basic introduction to ghost-free nonlinear theories involving
massive spin-2 fields, focussing on bimetric theory. After motivating the
construction of such models from field theoretical considerations, we review
the linear theories for massive and massless spin-2 fluctuations propagating on
maximally symme... | [
{
"created": "Wed, 24 Feb 2016 14:21:14 GMT",
"version": "v1"
}
] | 2016-02-25 | [
[
"Schmidt-May",
"Angnis",
""
]
] | We give a basic introduction to ghost-free nonlinear theories involving massive spin-2 fields, focussing on bimetric theory. After motivating the construction of such models from field theoretical considerations, we review the linear theories for massive and massless spin-2 fluctuations propagating on maximally symmetr... |
2211.03849 | Eva Politou | Eva Politou | A geometric framework for conservation laws along null hypersurfaces | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the general theory of local conservation laws for arbitrary partial
differential equations to provide a geometric framework for conservation laws
on characteristic null hypersurfaces. The operator of interest is the wave
operator on general four-dimensional Lorentzian manifolds restricted on a null
hypersurfac... | [
{
"created": "Mon, 7 Nov 2022 20:35:48 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Politou",
"Eva",
""
]
] | We use the general theory of local conservation laws for arbitrary partial differential equations to provide a geometric framework for conservation laws on characteristic null hypersurfaces. The operator of interest is the wave operator on general four-dimensional Lorentzian manifolds restricted on a null hypersurface. |
1407.5264 | Otari Sakhelashvili | Otari Sakhelashvili | Dimensional Reduction in 6D Standing Waves Braneworld | arXiv admin note: text overlap with arXiv:1202.1608 by other authors | International Journal of Modern Physics D Vol. 24, No. 1 (2015) | 10.1142/S0218271815500091 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We found cosmological solution of the 6D standing wave braneworld model
generated by gravity coupled to a massless scalar phantom-like field. By
obtaining a full exact solution of the model we found a novel dynamical
mechanism in which the anisotropic nature of the primordial metric gives rise
to expansion of three s... | [
{
"created": "Sun, 20 Jul 2014 10:33:13 GMT",
"version": "v1"
}
] | 2014-11-24 | [
[
"Sakhelashvili",
"Otari",
""
]
] | We found cosmological solution of the 6D standing wave braneworld model generated by gravity coupled to a massless scalar phantom-like field. By obtaining a full exact solution of the model we found a novel dynamical mechanism in which the anisotropic nature of the primordial metric gives rise to expansion of three spa... |
1012.2245 | Ahmed Bouda | A.Bouda and A.Belabbas | A possible Reinterpretation of Einstein's Equations | 11 pages, no figures | Int.J.Theor.Phys.49(2010)2630-2639 | 10.1007/s10773-010-0454-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we first review Huei's formulation in which it is shown that
the linearized Einstein equations can be written in the same form as the
Maxwell equations. We eliminate some imperfections like the scalar potential
which is ill linked to the electric-type field, the Lorentz-type force which is
obtained wit... | [
{
"created": "Fri, 10 Dec 2010 12:13:12 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Bouda",
"A.",
""
],
[
"Belabbas",
"A.",
""
]
] | In this paper, we first review Huei's formulation in which it is shown that the linearized Einstein equations can be written in the same form as the Maxwell equations. We eliminate some imperfections like the scalar potential which is ill linked to the electric-type field, the Lorentz-type force which is obtained with ... |
1711.06727 | Klaus Liegener Dr | Thorsten Lang, Klaus Liegener, Thomas Thiemann | Hamiltonian Renormalisation II. Renormalisation Flow of 1+1 dimensional
free scalar fields: Derivation | 30 pages | Class.Quant.Grav. 35 (2018) no.24, 245012 | 10.1088/1361-6382/aaec54 | null | gr-qc hep-lat hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the companion paper we motivated a renormalisation flow on
Osterwalder-Schrader data (OS-data) consisting of 1. a Hilbert space, 2. a
cyclic vacuum and 3. a Hamiltonian annihilating that vacuum. As the name
suggests, the motivation was via the OS reconstruction theorem which allows to
reconstruct the OS data from ... | [
{
"created": "Thu, 16 Nov 2017 14:42:22 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jul 2019 15:37:13 GMT",
"version": "v2"
}
] | 2019-07-09 | [
[
"Lang",
"Thorsten",
""
],
[
"Liegener",
"Klaus",
""
],
[
"Thiemann",
"Thomas",
""
]
] | In the companion paper we motivated a renormalisation flow on Osterwalder-Schrader data (OS-data) consisting of 1. a Hilbert space, 2. a cyclic vacuum and 3. a Hamiltonian annihilating that vacuum. As the name suggests, the motivation was via the OS reconstruction theorem which allows to reconstruct the OS data from an... |
2204.02454 | Vasilis Oikonomou | V.K. Oikonomou, Ifigeneia Giannakoudi | $\mathcal{R}^2$ Quantum Corrected Scalar Field Inflation | NPB Accepted | null | 10.1016/j.nuclphysb.2022.115779 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | String theory enjoys an elevated role among quantum gravity theories, since
it seems to be the most consistent UV completion of general relativity and the
Standard Model. However, it is hard to verify the existence of this underlying
theory on terrestrial accelerators. One way to probe string theory is to study
its i... | [
{
"created": "Tue, 5 Apr 2022 18:59:24 GMT",
"version": "v1"
}
] | 2022-04-27 | [
[
"Oikonomou",
"V. K.",
""
],
[
"Giannakoudi",
"Ifigeneia",
""
]
] | String theory enjoys an elevated role among quantum gravity theories, since it seems to be the most consistent UV completion of general relativity and the Standard Model. However, it is hard to verify the existence of this underlying theory on terrestrial accelerators. One way to probe string theory is to study its imp... |
1207.6030 | Marc-Thierry Jaekel | Marc-Thierry Jaekel, Brahim Lamine and Serge Reynaud | Phases and relativity in atomic gravimetry | 7 pages, 1 figure | Classical and Quantum Gravity 30, 6 (2013) 065006 | 10.1088/0264-9381/30/6/065006 | LPTENS 12/28 | gr-qc physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The phase observable measured by an atomic gravimeter built up on stimulated
Raman transitions is discussed in a fully relativistic context. It is written
in terms of laser phases which are invariant under relativistic gauge
transformations. The dephasing is the sum of light and atomic contributions
which are connect... | [
{
"created": "Wed, 25 Jul 2012 15:32:28 GMT",
"version": "v1"
}
] | 2014-09-16 | [
[
"Jaekel",
"Marc-Thierry",
""
],
[
"Lamine",
"Brahim",
""
],
[
"Reynaud",
"Serge",
""
]
] | The phase observable measured by an atomic gravimeter built up on stimulated Raman transitions is discussed in a fully relativistic context. It is written in terms of laser phases which are invariant under relativistic gauge transformations. The dephasing is the sum of light and atomic contributions which are connected... |
1802.01635 | Fr\'ed\'eric Lamy | Fr\'ed\'eric Lamy, Eric Gourgoulhon, Thibaut Paumard, Fr\'ed\'eric H.
Vincent | Imaging a non-singular rotating black hole at the center of the Galaxy | 25 pages, 31 figures; v2: two figures and some clarifications added,
version published in CQG | Classical and Quantum Gravity, 2018, Volume 35, Number 11 | 10.1088/1361-6382/aabd97 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the rotating generalization of Hayward's non-singular black hole
previously studied in the literature is geodesically incomplete, and that its
straightforward extension leads to a singular spacetime. We present another
extension, which is devoid of any curvature singularity. The obtained metric
depends o... | [
{
"created": "Mon, 5 Feb 2018 20:23:43 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2018 20:21:25 GMT",
"version": "v2"
}
] | 2018-05-15 | [
[
"Lamy",
"Frédéric",
""
],
[
"Gourgoulhon",
"Eric",
""
],
[
"Paumard",
"Thibaut",
""
],
[
"Vincent",
"Frédéric H.",
""
]
] | We show that the rotating generalization of Hayward's non-singular black hole previously studied in the literature is geodesically incomplete, and that its straightforward extension leads to a singular spacetime. We present another extension, which is devoid of any curvature singularity. The obtained metric depends on ... |
1107.2959 | Aaron Zimmerman | Aaron Zimmerman, David A. Nichols, and Fan Zhang | Classifying the Isolated Zeros of Asymptotic Gravitational Radiation by
Tendex and Vortex Lines | 10 pages, 10 figures. Changed to reflect published version, sign
errors fixed | Phys.Rev.D84:044037,2011 | 10.1103/PhysRevD.84.044037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new method to visualize the curvature of spacetime was recently proposed.
This method finds the eigenvectors of the "electric" and "magnetic" components
of the Weyl tensor and, in analogy to the field lines of electromagnetism, uses
the eigenvectors' integral curves to illustrate the spacetime curvature. Here
we us... | [
{
"created": "Thu, 14 Jul 2011 21:48:42 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Aug 2011 17:34:13 GMT",
"version": "v2"
}
] | 2011-09-08 | [
[
"Zimmerman",
"Aaron",
""
],
[
"Nichols",
"David A.",
""
],
[
"Zhang",
"Fan",
""
]
] | A new method to visualize the curvature of spacetime was recently proposed. This method finds the eigenvectors of the "electric" and "magnetic" components of the Weyl tensor and, in analogy to the field lines of electromagnetism, uses the eigenvectors' integral curves to illustrate the spacetime curvature. Here we use ... |
1606.01215 | Daniel Guariento | Daniel C. Guariento, Flavio Mercati | Self-gravitating fluid solutions of Shape Dynamics | 9 pages | Phys. Rev. D 94, 064023 (2016) | 10.1103/PhysRevD.94.064023 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Shape Dynamics is a 3D conformally invariant theory of gravity which
possesses a large set of solutions in common with General Relativity. When
looked closely, these solutions are found to behave in surprising ways, so in
order to probe the fitness of Shape Dynamics as a viable alternative to General
Relativity one m... | [
{
"created": "Fri, 3 Jun 2016 18:33:05 GMT",
"version": "v1"
}
] | 2016-09-14 | [
[
"Guariento",
"Daniel C.",
""
],
[
"Mercati",
"Flavio",
""
]
] | Shape Dynamics is a 3D conformally invariant theory of gravity which possesses a large set of solutions in common with General Relativity. When looked closely, these solutions are found to behave in surprising ways, so in order to probe the fitness of Shape Dynamics as a viable alternative to General Relativity one mus... |
gr-qc/0412080 | Roberto Gomez | Nigel T. Bishop, Roberto Gomez, Luis Lehner, Manoj Maharaj and Jeffrey
Winicour | On characteristic initial data for a star orbiting a black hole | 20 pages, 10 figures | Phys.Rev. D72 (2005) 024002 | 10.1103/PhysRevD.72.024002 | null | gr-qc | null | We take further steps in the development of the characteristic approach to
enable handling the physical problem of a compact self-gravitating object, such
as a neutron star, in close orbit around a black hole. We examine different
options for setting the initial data for this problem and, in order to shed
light on th... | [
{
"created": "Thu, 16 Dec 2004 17:52:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bishop",
"Nigel T.",
""
],
[
"Gomez",
"Roberto",
""
],
[
"Lehner",
"Luis",
""
],
[
"Maharaj",
"Manoj",
""
],
[
"Winicour",
"Jeffrey",
""
]
] | We take further steps in the development of the characteristic approach to enable handling the physical problem of a compact self-gravitating object, such as a neutron star, in close orbit around a black hole. We examine different options for setting the initial data for this problem and, in order to shed light on thei... |
1909.00018 | Filipe Mena | Paulo Luz and Filipe C. Mena | Singularity theorems and the inclusion of torsion in affine theories of
gravity | 15 pages | null | 10.1063/1.5126220 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the scope of the Raychaudhuri-Komar singularity theorem of General
Relativity to affine theories of gravity with and without torsion. We first
generalize the existing focusing theorems using time-like and null congruences
of curves which are hypersurface orthogonal, showing how the presence of
torsion affec... | [
{
"created": "Fri, 30 Aug 2019 18:14:11 GMT",
"version": "v1"
}
] | 2020-02-19 | [
[
"Luz",
"Paulo",
""
],
[
"Mena",
"Filipe C.",
""
]
] | We extend the scope of the Raychaudhuri-Komar singularity theorem of General Relativity to affine theories of gravity with and without torsion. We first generalize the existing focusing theorems using time-like and null congruences of curves which are hypersurface orthogonal, showing how the presence of torsion affects... |
gr-qc/0002039 | Mauricio Bellini | Mauricio Bellini (Universidad Nacional de Mar del Plata) | Warm inflation with coupled thermal quantum fluctuations: a new
semiclassical approach | Version awared ``Honorable Montion'' by Gravity Research Foundation
(2000) Version to be published in Il Nuovo Cimento B | Nuovo Cim.B115:1241-1247,2000 | null | null | gr-qc | null | I consider a new semiclassical expansion for the inflaton field in the
framework of warm inflation scenario. The fluctuations of the matter field are
considered as thermally coupled with the particles of the thermal bath. This
coupling parameter depends on the temperature of the bath. The power spectrum
remains invar... | [
{
"created": "Thu, 10 Feb 2000 14:03:19 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Mar 2000 13:29:05 GMT",
"version": "v2"
},
{
"created": "Tue, 16 May 2000 14:45:46 GMT",
"version": "v3"
},
{
"created": "Wed, 25 Oct 2000 19:12:36 GMT",
"version": "v4"
}
] | 2010-11-11 | [
[
"Bellini",
"Mauricio",
"",
"Universidad Nacional de Mar del Plata"
]
] | I consider a new semiclassical expansion for the inflaton field in the framework of warm inflation scenario. The fluctuations of the matter field are considered as thermally coupled with the particles of the thermal bath. This coupling parameter depends on the temperature of the bath. The power spectrum remains invaria... |
gr-qc/0702081 | David Garfinkle | David Garfinkle | Matters of Gravity, The Newsletter of the Topical Group in Gravitation
of the American Physical Society, Volume 29, Winter 2007 | 30 pages, latex, 1 figure, items added to the "we hear that..."
section | null | null | null | gr-qc | null | GGR News:
- The View from the NSF, by Beverly Berger
- GGR Program at the APS meeting in Jacksonville we hear that..., by David
Garfinkle
- 100 years ago, by David Garfinkle
Research Briefs:
- The Double Pulsar, by Michael Kramer
- Theoretical Approaches to Cosmic Acceleration, by Mark Trodden
Conferenc... | [
{
"created": "Wed, 14 Feb 2007 21:30:48 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 2007 19:38:17 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Garfinkle",
"David",
""
]
] | GGR News: - The View from the NSF, by Beverly Berger - GGR Program at the APS meeting in Jacksonville we hear that..., by David Garfinkle - 100 years ago, by David Garfinkle Research Briefs: - The Double Pulsar, by Michael Kramer - Theoretical Approaches to Cosmic Acceleration, by Mark Trodden Conference Reports: - Num... |
gr-qc/9409055 | Anton Kraemmer-Rebhan | H. Nachbagauer, A. K. Rebhan, D. J. Schwarz | Effects of weak self-interactions in a relativistic plasma on
cosmological perturbations | 11 pages, REVTEX, 4 postscript figures included by epsf.sty -
expanded version (more details on the resummation of thermal masses which is
required for the late-time damping behaviour) | Phys.Rev.D51:2504-2508,1995 | 10.1103/PhysRevD.51.2504 | DESY 94-165, ENSLAPP-A-487/94, TUW-94-18 | gr-qc astro-ph hep-ph | null | The exact solutions for linear cosmological perturbations which have been
obtained for collisionless relativistic matter within thermal field theory are
extended to a self-interacting case. The two-loop contributions of scalar
$\lambda\phi^4$ theory to the thermal graviton self-energy are evaluated, which
give the $O... | [
{
"created": "Tue, 27 Sep 1994 14:26:08 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 1994 16:41:48 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Nachbagauer",
"H.",
""
],
[
"Rebhan",
"A. K.",
""
],
[
"Schwarz",
"D. J.",
""
]
] | The exact solutions for linear cosmological perturbations which have been obtained for collisionless relativistic matter within thermal field theory are extended to a self-interacting case. The two-loop contributions of scalar $\lambda\phi^4$ theory to the thermal graviton self-energy are evaluated, which give the $O(\... |
1408.6436 | Piyali Bhar | Piyali Bhar | Vaidya-Tikekar Type Superdense Star Admitting Conformal Motion in
Presence of Quintessence Field | 9 pages,13 figures | Eur. Phys. J. C (2015) 75:123 | 10.1140/epjc/s10052-015-3340-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To explain the reason of accelerated expansion of our universe dark energy is
a suitable candidate. Motivated by this concept in the present paper we have
obtained a new model of an anisotropic superdense star which admits conformal
motions in presence of quintessence field which is characterized by a parameter
$omeg... | [
{
"created": "Tue, 26 Aug 2014 10:39:45 GMT",
"version": "v1"
}
] | 2015-03-24 | [
[
"Bhar",
"Piyali",
""
]
] | To explain the reason of accelerated expansion of our universe dark energy is a suitable candidate. Motivated by this concept in the present paper we have obtained a new model of an anisotropic superdense star which admits conformal motions in presence of quintessence field which is characterized by a parameter $omega$... |
1408.6997 | Leonardo Fernandez-Jambrina | L. Fern\'andez-Jambrina | Grand Rip and Grand Bang/Crunch cosmological singularities | 19 pages, 2 figures. Typos amended | Phys. Rev. D 90, 064014 (2014) | 10.1103/PhysRevD.90.064014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present accelerated expansion of the universe has enriched the list of
possible scenarios for its fate, singular or not. In this paper a unifying
framework for analyzing such behaviors is proposed, based on generalized power
and asymptotic expansions of the barotropic index $w$, or equivalently of the
deceleratio... | [
{
"created": "Fri, 29 Aug 2014 12:35:23 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Sep 2014 17:14:27 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Sep 2014 20:20:38 GMT",
"version": "v3"
},
{
"created": "Mon, 26 Jan 2015 08:39:31 GMT",
"version": "v4"
},
{
"cr... | 2019-03-07 | [
[
"Fernández-Jambrina",
"L.",
""
]
] | The present accelerated expansion of the universe has enriched the list of possible scenarios for its fate, singular or not. In this paper a unifying framework for analyzing such behaviors is proposed, based on generalized power and asymptotic expansions of the barotropic index $w$, or equivalently of the deceleration ... |
2103.00183 | Roberto Casadio | Roberto Casadio | Geometry and thermodynamics of coherent quantum black holes | LaTeX, 16 pages, 6 graphs in 4 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We present a quantum description of black holes given by coherent states of
gravitons sourced by a matter core. The expected behaviour in the weak-field
region outside the horizon is recovered, with arbitrarily good approximation,
but the classical central singularity is not resolved because the coherent
states may n... | [
{
"created": "Sat, 27 Feb 2021 10:46:48 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Apr 2021 14:45:46 GMT",
"version": "v2"
},
{
"created": "Sat, 4 Sep 2021 06:10:16 GMT",
"version": "v3"
},
{
"created": "Tue, 1 Mar 2022 17:52:23 GMT",
"version": "v4"
},
{
"cre... | 2022-09-09 | [
[
"Casadio",
"Roberto",
""
]
] | We present a quantum description of black holes given by coherent states of gravitons sourced by a matter core. The expected behaviour in the weak-field region outside the horizon is recovered, with arbitrarily good approximation, but the classical central singularity is not resolved because the coherent states may not... |
2009.14632 | Guo-Ping Li | Guo-Ping Li, Ke-Jian He and Bing-Bing Chen | Lorentz Violation, Quantum Tunneling and Information Conservation | 11 pages;4 figures;accepted by Chinese Physics C | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, by introducing a Lorentz-invariance-violation (LIV) class of
dispersion relations (DR) suppressed by the second power $(E/E_{QG})^2$, we
have investigated the effect of LIV on the Hawking radiation of the charged
Dirac particle via tunneling from a Reissner-Nordstr\"om(RN) black hole. We
first find the... | [
{
"created": "Mon, 28 Sep 2020 02:33:15 GMT",
"version": "v1"
}
] | 2020-10-01 | [
[
"Li",
"Guo-Ping",
""
],
[
"He",
"Ke-Jian",
""
],
[
"Chen",
"Bing-Bing",
""
]
] | In this paper, by introducing a Lorentz-invariance-violation (LIV) class of dispersion relations (DR) suppressed by the second power $(E/E_{QG})^2$, we have investigated the effect of LIV on the Hawking radiation of the charged Dirac particle via tunneling from a Reissner-Nordstr\"om(RN) black hole. We first find the e... |
1209.2110 | Lajos Di\'osi | Lajos Di\'osi | Note on Possible Emergence Time of Newtonian Gravity | 2pp, essentially revised, clarified, concretized version accepted in
PLA | Phys.Lett. A377 (2013) 1782-1783 | 10.1016/j.physleta.2013.05.021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If gravity were an emergent phenomenon, some relativistic as well as
non-relativistic speculations claim it is, then a certain emergence time scale
tau_? would characterize it. We argue that the available experimental evidences
have poor time resolution regarding how immediate the creation of Newton field
of accelera... | [
{
"created": "Sun, 9 Sep 2012 11:31:28 GMT",
"version": "v1"
},
{
"created": "Sat, 11 May 2013 20:50:49 GMT",
"version": "v2"
}
] | 2014-11-19 | [
[
"Diósi",
"Lajos",
""
]
] | If gravity were an emergent phenomenon, some relativistic as well as non-relativistic speculations claim it is, then a certain emergence time scale tau_? would characterize it. We argue that the available experimental evidences have poor time resolution regarding how immediate the creation of Newton field of accelerate... |
1403.7482 | Etera R. Livine | Mait\'e Dupuis, Florian Girelli, Etera R. Livine | Deformed Spinor Networks for Loop Gravity: Towards Hyperbolic Twisted
Geometries | 15 pages, 4 figures | Gen.Rel.Grav. 46 (2014) 11 | 10.1007/s10714-014-1802-3 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of a canonical quantization of general relativity, one can
deform the loop gravity phase space on a graph by replacing the T*SU(2) phase
space attached to each edge by SL(2,C) seen as a phase space. This deformation
is supposed to encode the presence of a non-zero cosmological constant. Here we
show ho... | [
{
"created": "Fri, 28 Mar 2014 18:49:12 GMT",
"version": "v1"
}
] | 2016-03-08 | [
[
"Dupuis",
"Maité",
""
],
[
"Girelli",
"Florian",
""
],
[
"Livine",
"Etera R.",
""
]
] | In the context of a canonical quantization of general relativity, one can deform the loop gravity phase space on a graph by replacing the T*SU(2) phase space attached to each edge by SL(2,C) seen as a phase space. This deformation is supposed to encode the presence of a non-zero cosmological constant. Here we show how ... |
gr-qc/0310106 | Sanjay Sarwe | Sanjay B. Sarwe and R. V. Saraykar | Stability of Naked Singularity arising in gravitational collapse of Type
I matter fields | 16 pages, no figure, Latex, submitted to Pramana | Pramana65:17-33,2005 | 10.1007/BF02704372 | null | gr-qc | null | Considering gravitational collapse of Type I matter fields, we prove that,
given an arbitrary $C^{2}$- mass function $\textit{M}(r,v)$ and a $C^{1}$-
function $h(r,v)$ (through the corresponding $C^{1}$- metric function
$\nu(t,r)$), there exist infinitely many choices of energy distribution
function $b(r)$ such that ... | [
{
"created": "Wed, 22 Oct 2003 19:22:18 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 2004 17:11:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sarwe",
"Sanjay B.",
""
],
[
"Saraykar",
"R. V.",
""
]
] | Considering gravitational collapse of Type I matter fields, we prove that, given an arbitrary $C^{2}$- mass function $\textit{M}(r,v)$ and a $C^{1}$- function $h(r,v)$ (through the corresponding $C^{1}$- metric function $\nu(t,r)$), there exist infinitely many choices of energy distribution function $b(r)$ such that th... |
0909.5688 | Benjamin Bahr | B. Bahr, B. Dittrich | Breaking and restoring of diffeomorphism symmetry in discrete gravity | to appear in the Proceedings of the XXV Max Born Symposium "The
Planck Scale", Wroclaw, 29 June - 3 July, 2009 | null | 10.1063/1.3284371 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the fate of diffeomorphism symmetry in discrete gravity.
Diffeomorphism symmetry is typically broken by the discretization. This has
repercussions for the observable content and the canonical formulation of the
theory. It might however be possible to construct discrete actions, so--called
perfect actions, ... | [
{
"created": "Wed, 30 Sep 2009 18:21:24 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Bahr",
"B.",
""
],
[
"Dittrich",
"B.",
""
]
] | We discuss the fate of diffeomorphism symmetry in discrete gravity. Diffeomorphism symmetry is typically broken by the discretization. This has repercussions for the observable content and the canonical formulation of the theory. It might however be possible to construct discrete actions, so--called perfect actions, wi... |
gr-qc/9211014 | Peter Peldan | Peter Peldan | Unification of Gravity and Yang-Mills Theory in (2+1)-Dimensions | 22pages | Nucl.Phys. B395 (1993) 239-262 | 10.1016/0550-3213(93)90216-C | ITP 92-49 | gr-qc hep-th | null | A gauge and diffeomorphism invariant theory in (2+1)-dimensions is presented
in both first and second order Lagrangian form as well as in a Hamiltonian
form. For gauge group $SO(1,2)$, the theory is shown to describe ordinary
Einstein gravity with a cosmological constant. With gauge group
$G^{tot}=SO(1,2)\otimes G^{Y... | [
{
"created": "Tue, 10 Nov 1992 12:48:16 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Peldan",
"Peter",
""
]
] | A gauge and diffeomorphism invariant theory in (2+1)-dimensions is presented in both first and second order Lagrangian form as well as in a Hamiltonian form. For gauge group $SO(1,2)$, the theory is shown to describe ordinary Einstein gravity with a cosmological constant. With gauge group $G^{tot}=SO(1,2)\otimes G^{YM}... |
0806.0669 | Martin Reiris | Martin Reiris | On the asymptotic spectrum of the reduced volume in cosmological
solutions of the Einstein equations | 25 pages, 2 figures | null | 10.1007/s10714-008-0693-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Say S is a compact three-manifold with non-positive Yamabe invariant. We
prove that in any long time constant mean curvature Einstein flow over S,
having bounded C^{\alpha} space-time curvature at the cosmological scale, the
reduced volume (-k/3)^{3}Vol(g(k)) (g(k) is the evolving spatial three-metric
and k the mean ... | [
{
"created": "Wed, 4 Jun 2008 01:03:52 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Reiris",
"Martin",
""
]
] | Say S is a compact three-manifold with non-positive Yamabe invariant. We prove that in any long time constant mean curvature Einstein flow over S, having bounded C^{\alpha} space-time curvature at the cosmological scale, the reduced volume (-k/3)^{3}Vol(g(k)) (g(k) is the evolving spatial three-metric and k the mean cu... |
2110.04879 | Roberto Ivan Cabrera Munguia Dr. | I. Cabrera-Munguia | Metric for two unequal extreme Kerr-Newman black holes | 9 pages | Physics Letters B 826 (2022) 136895 | 10.1016/j.physletb.2022.136895 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the present paper, within the framework of stationary axisymmetric
spacetimes, binary systems composed of two unequal co- and counter-rotating
extreme Kerr-Newman black holes separated by a massless strut are reported. The
metric describing both configurations is introduced in a closed analytical form
in terms of ... | [
{
"created": "Sun, 10 Oct 2021 19:00:23 GMT",
"version": "v1"
}
] | 2022-02-01 | [
[
"Cabrera-Munguia",
"I.",
""
]
] | In the present paper, within the framework of stationary axisymmetric spacetimes, binary systems composed of two unequal co- and counter-rotating extreme Kerr-Newman black holes separated by a massless strut are reported. The metric describing both configurations is introduced in a closed analytical form in terms of fi... |
gr-qc/0204037 | Walter Simon | Walter Simon | Criteria for (in)finite extent of static perfect fluids | 17 pages, Latex | Lect.Notes Phys. 604 (2002) 223-238 | null | UWThPh-2000-56 | gr-qc | null | In Newton's and in Einstein's theory we give criteria on the equation of
state of a barotropic perfect fluid which guarantee that the corresponding
one-parameter family of static, spherically symmetric solutions has finite
extent. These criteria are closely related to ones which are known to ensure
finite or infinite... | [
{
"created": "Tue, 9 Apr 2002 18:07:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Simon",
"Walter",
""
]
] | In Newton's and in Einstein's theory we give criteria on the equation of state of a barotropic perfect fluid which guarantee that the corresponding one-parameter family of static, spherically symmetric solutions has finite extent. These criteria are closely related to ones which are known to ensure finite or infinite e... |
2208.10986 | Luis Herrera | L. Herrera | Non-static hyperbolicallly symmetric fluids | 12 pages revtex 4. Based on the conferences delivered at Gravitex
2021 Conference, Durban, South Africa, and 4th PU International Conference of
Gravitation and Cosmology, Lahore, Pakistan, in August 2021 and November 2021
respectively. To appear in Int. J. Mod. Phys. D. arXiv admin note: text
overlap with arXiv... | Int. J. Mod. Phys. D 31, 2240001, (2022) | 10.1142/S0218271822400016 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present the general properties of dynamic dissipative fluid distribution
endowed with hyperbolical symmetry. All the equations required for its analysis
are exhibited and used to contrast the behavior of the system with the
spherically symmetric case. Several exact solutions are exhibited and
prospective applicati... | [
{
"created": "Tue, 23 Aug 2022 14:08:38 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Herrera",
"L.",
""
]
] | We present the general properties of dynamic dissipative fluid distribution endowed with hyperbolical symmetry. All the equations required for its analysis are exhibited and used to contrast the behavior of the system with the spherically symmetric case. Several exact solutions are exhibited and prospective application... |
1207.1086 | Daniel Guariento | Daniel C. Guariento, Michele Fontanini, Alan M. da Silva, Elcio
Abdalla | Realistic fluids as source for dynamically accreting black holes in a
cosmological background | 5 pages, 2 figures. Updated references and minor changes to match the
version accepted for publishing in PRD | Phys. Rev. D 86, 124020 (2012) | 10.1103/PhysRevD.86.124020 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a single imperfect fluid can be used as a source to obtain the
generalized McVittie metric as an exact solution to Einstein's equations. The
mass parameter in this metric varies with time thanks to a mechanism based on
the presence of a temperature gradient. This fully dynamical solution is
interpreted a... | [
{
"created": "Wed, 4 Jul 2012 19:17:12 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Nov 2012 18:40:40 GMT",
"version": "v2"
}
] | 2012-12-07 | [
[
"Guariento",
"Daniel C.",
""
],
[
"Fontanini",
"Michele",
""
],
[
"da Silva",
"Alan M.",
""
],
[
"Abdalla",
"Elcio",
""
]
] | We show that a single imperfect fluid can be used as a source to obtain the generalized McVittie metric as an exact solution to Einstein's equations. The mass parameter in this metric varies with time thanks to a mechanism based on the presence of a temperature gradient. This fully dynamical solution is interpreted as ... |
gr-qc/9604055 | Jolien Creighton | K. C. K. Chan, J. D. E. Creighton, and R. B. Mann | Conserved masses in GHS Einstein and string black holes | 16 pages REVTeX with packages amsfonts and amssymb | Phys.Rev. D54 (1996) 3892-3899 | 10.1103/PhysRevD.54.3892 | WATPHYS TH-96/06 | gr-qc hep-th | null | We analyze the relationship between quasilocal masses calculated for
solutions of conformally related theories. We show that the ADM mass of a
static, spherically symmetric solution is conformally invariant (up to a
constant factor) only if the background action functional is conformally
invariant. Thus, the requirem... | [
{
"created": "Mon, 29 Apr 1996 18:55:29 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Chan",
"K. C. K.",
""
],
[
"Creighton",
"J. D. E.",
""
],
[
"Mann",
"R. B.",
""
]
] | We analyze the relationship between quasilocal masses calculated for solutions of conformally related theories. We show that the ADM mass of a static, spherically symmetric solution is conformally invariant (up to a constant factor) only if the background action functional is conformally invariant. Thus, the requiremen... |
2006.08583 | Fabrizio Di Giovanni | Fabrizio Di Giovanni, Saeed Fakhry, Nicolas Sanchis-Gual, Juan Carlos
Degollado, Jos\'e A. Font | Dynamical formation and stability of fermion-boson stars | 13 pages, 16 figures | Phys. Rev. D 102, 084063 (2020) | 10.1103/PhysRevD.102.084063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitationally bound structures composed by fermions and scalar particles
known as fermion-boson stars are regular and static configurations obtained by
solving the coupled Einstein-Klein-Gordon-Euler (EKGE) system. In this work, we
discuss one possible scenario through which these fermion-boson stars may form
by so... | [
{
"created": "Mon, 15 Jun 2020 17:49:17 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 2020 07:31:56 GMT",
"version": "v2"
}
] | 2020-11-04 | [
[
"Di Giovanni",
"Fabrizio",
""
],
[
"Fakhry",
"Saeed",
""
],
[
"Sanchis-Gual",
"Nicolas",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Font",
"José A.",
""
]
] | Gravitationally bound structures composed by fermions and scalar particles known as fermion-boson stars are regular and static configurations obtained by solving the coupled Einstein-Klein-Gordon-Euler (EKGE) system. In this work, we discuss one possible scenario through which these fermion-boson stars may form by solv... |
1811.00390 | Saulo Pereira H | S.H. Pereira, M.E.S. Alves and T.M. Guimar\~aes | An unified cosmological evolution driven by a mass dimension one
fermionic field | 22 pages, 5 figures | Eur. Phys. J. C (2019) 79:543 | 10.1140/epjc/s10052-019-7036-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An unified cosmological model for an Universe filled with a mass dimension
one (MDO) fermionic field plus the standard matter fields is considered. After
a primordial quantum fluctuation the field slowly rolls down to the bottom of a
symmetry breaking potential, driving the Universe to an inflationary regime
that inc... | [
{
"created": "Mon, 29 Oct 2018 19:52:39 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2019 20:14:09 GMT",
"version": "v2"
}
] | 2019-07-02 | [
[
"Pereira",
"S. H.",
""
],
[
"Alves",
"M. E. S.",
""
],
[
"Guimarães",
"T. M.",
""
]
] | An unified cosmological model for an Universe filled with a mass dimension one (MDO) fermionic field plus the standard matter fields is considered. After a primordial quantum fluctuation the field slowly rolls down to the bottom of a symmetry breaking potential, driving the Universe to an inflationary regime that incre... |
gr-qc/9806009 | Roland Steinbauer | Michael Kunzinger, Roland Steinbauer | A rigorous solution concept for geodesic and geodesic deviation
equations in impulsive gravitational waves | RevTeX, 9 pages, final version (minor corrections, references added) | J.Math.Phys. 40 (1999) 1479-1489 | 10.1063/1.532816 | UWThPh-1998-25 | gr-qc math-ph math.MP | null | The geodesic as well as the geodesic deviation equation for impulsive
gravitational waves involve highly singular products of distributions
$(\theta\de$, $\theta^2\de$, $\de^2$). A solution concept for these equations
based on embedding the distributional metric into the Colombeau algebra of
generalized functions is ... | [
{
"created": "Wed, 3 Jun 1998 08:31:39 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 1999 13:34:02 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kunzinger",
"Michael",
""
],
[
"Steinbauer",
"Roland",
""
]
] | The geodesic as well as the geodesic deviation equation for impulsive gravitational waves involve highly singular products of distributions $(\theta\de$, $\theta^2\de$, $\de^2$). A solution concept for these equations based on embedding the distributional metric into the Colombeau algebra of generalized functions is pr... |
1201.2725 | T.G Zlosnik | H.F. Westman, T.G. Zlosnik | Gravitation and spatial conformal invariance | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that General Relativity with positive cosmological constant
can be formulated as a gauge theory with a broken SO(1,4) symmetry. This
symmetry is broken by the presence of an internal space-like vector $V^A$,
$A=0,...,4$, with SO(1,3) as a residual invariance group. Attempts to ascribe
dynamics to the... | [
{
"created": "Fri, 13 Jan 2012 01:49:21 GMT",
"version": "v1"
}
] | 2012-01-16 | [
[
"Westman",
"H. F.",
""
],
[
"Zlosnik",
"T. G.",
""
]
] | It is well-known that General Relativity with positive cosmological constant can be formulated as a gauge theory with a broken SO(1,4) symmetry. This symmetry is broken by the presence of an internal space-like vector $V^A$, $A=0,...,4$, with SO(1,3) as a residual invariance group. Attempts to ascribe dynamics to the f... |
gr-qc/9706069 | Abhay Ashtekar | Abhay Ashtekar, Troy A. Schilling | Geometrical Formulation of Quantum Mechanics | 41 pages, ReVTeX | null | null | CGPG 97/6-1 | gr-qc hep-th quant-ph | null | States of a quantum mechanical system are represented by rays in a complex
Hilbert space. The space of rays has, naturally, the structure of a K\"ahler
manifold. This leads to a geometrical formulation of the postulates of quantum
mechanics which, although equivalent to the standard algebraic formulation, has
a very ... | [
{
"created": "Mon, 23 Jun 1997 15:55:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Schilling",
"Troy A.",
""
]
] | States of a quantum mechanical system are represented by rays in a complex Hilbert space. The space of rays has, naturally, the structure of a K\"ahler manifold. This leads to a geometrical formulation of the postulates of quantum mechanics which, although equivalent to the standard algebraic formulation, has a very di... |
2301.06879 | Bayram Tekin | Zeynep Tugce Ozkarsligil, Bayram Tekin | Mass formulas for individual black holes in merging binaries | 9 pages, matches the published version | Eur. J. Phys. 45 025601 (2024) | 10.1088/1361-6404/ad1531 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give formulas for individual black hole masses in a merger, by using
Newtonian physics, in terms of the three measured quantities in the detector:
the initial wave frequency $f_1$, the maximum detected frequency (chirp
frequency) $f_2$, and the time elapse $\tau$ between these two frequencies.
Newtonian gravity pr... | [
{
"created": "Tue, 17 Jan 2023 13:37:15 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Mar 2023 11:31:53 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jan 2024 14:22:54 GMT",
"version": "v3"
}
] | 2024-01-17 | [
[
"Ozkarsligil",
"Zeynep Tugce",
""
],
[
"Tekin",
"Bayram",
""
]
] | We give formulas for individual black hole masses in a merger, by using Newtonian physics, in terms of the three measured quantities in the detector: the initial wave frequency $f_1$, the maximum detected frequency (chirp frequency) $f_2$, and the time elapse $\tau$ between these two frequencies. Newtonian gravity prov... |
gr-qc/0301005 | Georgii Alekseev | G.A.Alekseev | Characteristic initial value problems for integrable hyperbolic
reductions of Einstein's equations | 8 pages, RevTeX 4; as submitted to the Proceedings of the workshop
"Nonlinear Physics: Theory and Experiment. II" (Gallipili (Lecce), Italy,
27.06.2002 - 06.07.2002), World Scientific, Singapore | null | 10.1142/9789812704467_0003 | null | gr-qc hep-th nlin.SI | null | A unified general approach is presented for construction of solutions of the
characteristic initial value problems for various integrable hyperbolic
reductions of Einstein's equations for space-times with two commuting
isometries in General Relativity and in some string theory induced gravity
models. In all cases the... | [
{
"created": "Thu, 2 Jan 2003 23:32:35 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Alekseev",
"G. A.",
""
]
] | A unified general approach is presented for construction of solutions of the characteristic initial value problems for various integrable hyperbolic reductions of Einstein's equations for space-times with two commuting isometries in General Relativity and in some string theory induced gravity models. In all cases the a... |
1903.10450 | Frans Klinkhamer | F.R. Klinkhamer | Regularized big bang singularity | 16 pages, 1 figure, v6: published version | Phys. Rev. D 100, 023536 (2019) | 10.1103/PhysRevD.100.023536 | KA-TP-04-2019 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following up on earlier work on the regularization of the singular
Schwarzschild solution, we now apply the same procedure to the singular
Friedmann solution. Specifically, we are able to remove the divergences of the
big bang singularity, at the price of introducing a 3-dimensional spacetime
defect with a vanishing ... | [
{
"created": "Mon, 25 Mar 2019 16:35:26 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2019 17:19:19 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Apr 2019 17:38:00 GMT",
"version": "v3"
},
{
"created": "Tue, 7 May 2019 14:31:31 GMT",
"version": "v4"
},
{
"cre... | 2019-07-31 | [
[
"Klinkhamer",
"F. R.",
""
]
] | Following up on earlier work on the regularization of the singular Schwarzschild solution, we now apply the same procedure to the singular Friedmann solution. Specifically, we are able to remove the divergences of the big bang singularity, at the price of introducing a 3-dimensional spacetime defect with a vanishing de... |
1402.5947 | Lorenzo Iorio | Lorenzo Iorio | Post-Newtonian direct and mixed orbital effects due to the oblateness of
the central body | LaTex2e, 60 pages, 93 references, no figures, 2 tables. Sign error
corrected in Eq. (98) | Int. J. Mod. Phys. D24 (2015) 1550067 | 10.1142/S0218271815500674 | null | gr-qc astro-ph.EP physics.geo-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The orbital dynamics of a test particle moving in the non-spherically
symmetric field of a rotating oblate primary is impacted also by certain
indirect, mixed effects arising from the interplay of the different Newtonian
and post-Newtonian accelerations which induce known direct perturbations. We
systematically calcu... | [
{
"created": "Sat, 22 Feb 2014 15:20:18 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Mar 2014 15:33:10 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Aug 2014 14:15:03 GMT",
"version": "v3"
},
{
"created": "Mon, 23 Mar 2015 14:07:57 GMT",
"version": "v4"
},
{
"cr... | 2017-10-06 | [
[
"Iorio",
"Lorenzo",
""
]
] | The orbital dynamics of a test particle moving in the non-spherically symmetric field of a rotating oblate primary is impacted also by certain indirect, mixed effects arising from the interplay of the different Newtonian and post-Newtonian accelerations which induce known direct perturbations. We systematically calcula... |
2305.10535 | Nawsad Ali | Nawsad Ali | Bulk Viscous Bianchi Type-V Cosmological Model with Time Function G and
Lambda | 18 pages, 6 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-sa/4.0/ | In this paper we are to study homogeneous and anisotropic Bianchi type-V
universe in presence of bulk viscous fluid source of matter with time function
gravitational constant G and cosmological term lambda. The viscosity
coefficient is regarded as power function of matter density in the first case
whereas in other ca... | [
{
"created": "Wed, 19 Apr 2023 23:33:28 GMT",
"version": "v1"
}
] | 2023-05-19 | [
[
"Ali",
"Nawsad",
""
]
] | In this paper we are to study homogeneous and anisotropic Bianchi type-V universe in presence of bulk viscous fluid source of matter with time function gravitational constant G and cosmological term lambda. The viscosity coefficient is regarded as power function of matter density in the first case whereas in other case... |
1906.02921 | Subhajit Barman | Subhajit Barman and Gopal Sardar | Perturbative approach to the entanglement entropy and the area law in
Fock and polymer quantization | 12 pages, 7 figures, revtex4 | Phys. Rev. D 99, 125015 (2019) | 10.1103/PhysRevD.99.125015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The area dependence of entanglement entropy of a free scalar field is often
understood in terms of coupled harmonic oscillators. In Schrodinger
quantization, the Gaussian nature of ground state wave-function for these
oscillators is sufficient to provide the exact form of the reduced density
matrix and its eigenvalue... | [
{
"created": "Fri, 7 Jun 2019 06:31:17 GMT",
"version": "v1"
}
] | 2019-07-03 | [
[
"Barman",
"Subhajit",
""
],
[
"Sardar",
"Gopal",
""
]
] | The area dependence of entanglement entropy of a free scalar field is often understood in terms of coupled harmonic oscillators. In Schrodinger quantization, the Gaussian nature of ground state wave-function for these oscillators is sufficient to provide the exact form of the reduced density matrix and its eigenvalues,... |
gr-qc/9908049 | Hans-Juergen Schmidt | V. Dzhunushaliev, H.-J. Schmidt | New vacuum solutions of conformal Weyl gravity | 15 pages, LaTeX, no figures, submitted to J. Math. Phys | J.Math.Phys. 41 (2000) 3007-3015 | 10.1063/1.533287 | Preprint UNIPO-MATH-99-July-19 | gr-qc | null | The Bach equation, i.e., the vacuum field equation following from the
Lagrangian L=C_{ijkl}C^{ijkl}, will be completely solved for the case that the
metric is conformally related to the cartesian product of two 2-spaces; this
covers the spherically and the plane symmetric space-times as special subcases.
Contrary to ... | [
{
"created": "Tue, 17 Aug 1999 15:07:17 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dzhunushaliev",
"V.",
""
],
[
"Schmidt",
"H. -J.",
""
]
] | The Bach equation, i.e., the vacuum field equation following from the Lagrangian L=C_{ijkl}C^{ijkl}, will be completely solved for the case that the metric is conformally related to the cartesian product of two 2-spaces; this covers the spherically and the plane symmetric space-times as special subcases. Contrary to ot... |
2106.07618 | Karan Fernandes | Karan Fernandes, Susovan Maity and Tapas K. Das | Dynamical analogue spacetimes in non-relativistic flows | 42 pages, 33 figures. arXiv admin note: text overlap with
arXiv:2005.14114 | null | 10.1103/PhysRevD.106.025020 | null | gr-qc astro-ph.HE physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analogue gravity models describe linear fluctuations of fluids as a massless
scalar field propagating on stationary acoustic spacetimes constructed from the
background flow. In this paper, we establish that this paradigm generalizes to
arbitrary order nonlinear perturbations propagating on dynamical analogue
spacetim... | [
{
"created": "Mon, 14 Jun 2021 17:21:54 GMT",
"version": "v1"
}
] | 2022-08-17 | [
[
"Fernandes",
"Karan",
""
],
[
"Maity",
"Susovan",
""
],
[
"Das",
"Tapas K.",
""
]
] | Analogue gravity models describe linear fluctuations of fluids as a massless scalar field propagating on stationary acoustic spacetimes constructed from the background flow. In this paper, we establish that this paradigm generalizes to arbitrary order nonlinear perturbations propagating on dynamical analogue spacetimes... |
0807.4253 | Julio Cesar Fabris | John D. Barrow, Antonio B. Batista, Julio C. Fabris and M. J. S.
Houndjo | Quantum Particle Production at Sudden Singularities | Latex file, 13 pages, five figures in eps format. Extended
discussion, new appendix and added references | Phys.Rev.D78:123508,2008 | 10.1103/PhysRevD.78.123508 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effects of quantum particle production on a classical
sudden singularity occurring at fine time in a Friedmann universe. We use an
exact solution to describe an initially radiation-dominated universe that
evolves into a sudden singularity at finite time. We calculate the density of
created particle... | [
{
"created": "Sat, 26 Jul 2008 20:08:44 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Aug 2008 12:10:51 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Nov 2008 14:44:30 GMT",
"version": "v3"
}
] | 2012-07-06 | [
[
"Barrow",
"John D.",
""
],
[
"Batista",
"Antonio B.",
""
],
[
"Fabris",
"Julio C.",
""
],
[
"Houndjo",
"M. J. S.",
""
]
] | We investigate the effects of quantum particle production on a classical sudden singularity occurring at fine time in a Friedmann universe. We use an exact solution to describe an initially radiation-dominated universe that evolves into a sudden singularity at finite time. We calculate the density of created particles ... |
2205.00556 | Maur\'icio Richartz | Pedro Henrique Croti Siqueira, Maur\'icio Richartz | Quasinormal modes, quasibound states, scalar clouds, and superradiant
instabilities of a Kerr-like black hole | v2: 13 pages, 11 figures. Matches published version | Phys. Rev. D 106, 024046 (2022) | 10.1103/PhysRevD.106.024046 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the continued fraction method to determine the eigenfrequencies
associated with a scalar field around a Kerr-like black hole. The Kerr-like
metric considered in this article is a subclass of the general parametrization
of axisymmetric black holes proposed by Konoplya, Rezzolla and Zhidenko. In
addition to its ... | [
{
"created": "Sun, 1 May 2022 20:40:18 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2022 02:57:38 GMT",
"version": "v2"
}
] | 2022-07-27 | [
[
"Siqueira",
"Pedro Henrique Croti",
""
],
[
"Richartz",
"Maurício",
""
]
] | We use the continued fraction method to determine the eigenfrequencies associated with a scalar field around a Kerr-like black hole. The Kerr-like metric considered in this article is a subclass of the general parametrization of axisymmetric black holes proposed by Konoplya, Rezzolla and Zhidenko. In addition to its ma... |
2206.13944 | Ryosuke Urakawa | Ryosuke Urakawa, Takuya Tsuchiya and Gen Yoneda | On the stability of covariant BSSN formulation | 18 pages, 6 figures | null | 10.1088/1361-6382/ac7e16 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the numerical stability of the covariant BSSN
(cBSSN) formulation proposed by Brown. We calculate the constraint
amplification factor (CAF), which is an eigenvalue of the coefficient matrix of
the evolution equations of the constraints on the cBSSN formulation and on some
adjusted formul... | [
{
"created": "Mon, 27 Jun 2022 00:00:52 GMT",
"version": "v1"
}
] | 2022-08-10 | [
[
"Urakawa",
"Ryosuke",
""
],
[
"Tsuchiya",
"Takuya",
""
],
[
"Yoneda",
"Gen",
""
]
] | In this study, we investigate the numerical stability of the covariant BSSN (cBSSN) formulation proposed by Brown. We calculate the constraint amplification factor (CAF), which is an eigenvalue of the coefficient matrix of the evolution equations of the constraints on the cBSSN formulation and on some adjusted formulat... |
1708.04609 | Dennis Philipp | Dennis Philipp, Florian W\"oske, Liliane Biskupek, Eva Hackmann,
Enrico Mai, Meike List, Claus L\"ammerzahl, Benny Rievers | Modeling approaches for precise relativistic orbits: Analytical,
Lie-series, and pN approximation | 15 pages, 5 figures; updated version with journal reference | Advances in Space Research, Volume 62, Issue 4, 2018, Pages
921-934 | 10.1016/j.asr.2018.05.020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurate orbit modeling plays a key role in contemporary and future space
missions such as GRACE and its successor GRACE-FO, GNSS, and altimetry
missions. To fully exploit the technological capabilities and correctly
interpret measurements, relativistic orbital effects need to be taken into
account. Within the theory... | [
{
"created": "Tue, 15 Aug 2017 17:59:12 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2019 16:50:44 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Philipp",
"Dennis",
""
],
[
"Wöske",
"Florian",
""
],
[
"Biskupek",
"Liliane",
""
],
[
"Hackmann",
"Eva",
""
],
[
"Mai",
"Enrico",
""
],
[
"List",
"Meike",
""
],
[
"Lämmerzahl",
"Claus",
""
],
[
"R... | Accurate orbit modeling plays a key role in contemporary and future space missions such as GRACE and its successor GRACE-FO, GNSS, and altimetry missions. To fully exploit the technological capabilities and correctly interpret measurements, relativistic orbital effects need to be taken into account. Within the theory o... |
1601.07290 | Yasutaka Koga | Yasutaka Koga and Tomohiro Harada | The correspondence between sonic points of ideal photon gas accretion
and photon spheres | 9pages | Phys. Rev. D 94, 044053 (2016) | 10.1103/PhysRevD.94.044053 | RUP-16-5 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an accretion of fluid, its velocity may transit from subsonic to
supersonic. The point at which such transition occurs is called sonic point and
often mathematically special. We consider a steady-state and spherically
symmetric accretion problem of ideal photon gas in general static spherically
symmetric spacetime... | [
{
"created": "Wed, 27 Jan 2016 08:48:06 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2016 10:36:56 GMT",
"version": "v2"
}
] | 2016-09-07 | [
[
"Koga",
"Yasutaka",
""
],
[
"Harada",
"Tomohiro",
""
]
] | In an accretion of fluid, its velocity may transit from subsonic to supersonic. The point at which such transition occurs is called sonic point and often mathematically special. We consider a steady-state and spherically symmetric accretion problem of ideal photon gas in general static spherically symmetric spacetime n... |
1903.09316 | Alesandro Santos A. F. Santos | W. D. R. Jesus and A. F. Santos | Ricci dark energy in bumblebee gravity model | 10 pages, 4 figures, accepted for publication in MPLA | null | 10.1142/S0217732319501712 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Ricci dark energy is a model inspired by the holographic dark energy
models with the dark energy density being proportional to Ricci scalar
curvature. Here this model is studied in the bumblebee gravity theory. It is a
gravitational theory that exhibit spontaneous Lorentz symmetry breaking. Then
the modified Frie... | [
{
"created": "Tue, 19 Mar 2019 12:10:20 GMT",
"version": "v1"
}
] | 2019-08-07 | [
[
"Jesus",
"W. D. R.",
""
],
[
"Santos",
"A. F.",
""
]
] | The Ricci dark energy is a model inspired by the holographic dark energy models with the dark energy density being proportional to Ricci scalar curvature. Here this model is studied in the bumblebee gravity theory. It is a gravitational theory that exhibit spontaneous Lorentz symmetry breaking. Then the modified Friedm... |
1212.6954 | Julio Cesar Fabris | Gabriel F. Silva, Oliver F. Piattella, Julio C. Fabris, Luciano
Casarini, Taislane O. Barbosa | Bouncing solutions in Rastall's theory with a barotropic fluid | Latex file, 14 pages, 1 figure in eps format. Typos corrected, one
reference added. Published version | Grav. Cosmol. 19 (2013) 156-162 | 10.1134/S0202289313030109 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rastall's theory is a modification of Einstein's theory of gravity where the
covariant divergence of the stress-energy tensor is no more vanishing, but
proportional to the gradient of the Ricci scalar. The motivation of this theory
is to investigate a possible non-minimal coupling of the matter fields to
geometry whi... | [
{
"created": "Mon, 31 Dec 2012 19:36:27 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jan 2013 11:11:00 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Sep 2014 22:09:51 GMT",
"version": "v3"
}
] | 2015-06-12 | [
[
"Silva",
"Gabriel F.",
""
],
[
"Piattella",
"Oliver F.",
""
],
[
"Fabris",
"Julio C.",
""
],
[
"Casarini",
"Luciano",
""
],
[
"Barbosa",
"Taislane O.",
""
]
] | Rastall's theory is a modification of Einstein's theory of gravity where the covariant divergence of the stress-energy tensor is no more vanishing, but proportional to the gradient of the Ricci scalar. The motivation of this theory is to investigate a possible non-minimal coupling of the matter fields to geometry which... |
gr-qc/9508009 | null | A. Mikovic | Unitary Theory of Evaporating 2D Black Holes | LaTex file | Class.Quant.Grav.13:209-220,1996 | 10.1088/0264-9381/13/2/009 | Imperial/TP/94-95/50 | gr-qc hep-th | null | We study a manifestly unitary formulation of 2d dilaton quantum gravity based
on the reduced phase space quantization. The spacetime metric can be expanded
in a formal power series of the matter energy-momentum tensor operator. This
expansion can be used for calculating the quantum corrections to the classical
black ... | [
{
"created": "Fri, 4 Aug 1995 12:08:09 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Mikovic",
"A.",
""
]
] | We study a manifestly unitary formulation of 2d dilaton quantum gravity based on the reduced phase space quantization. The spacetime metric can be expanded in a formal power series of the matter energy-momentum tensor operator. This expansion can be used for calculating the quantum corrections to the classical black ho... |
1304.0487 | Alexandru Ionescu | S. Alexakis, A. D. Ionescu, and S. Klainerman | Rigidity of stationary black holes with small angular momentum on the
horizon | Minor corrections, submitted version | Duke Math. J. 163, no. 14 (2014), 2603-2615 | 10.1215/00127094-2819517 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a black hole rigidity result for slowly rotating stationary
solutions of the Einstein vacuum equations. More precisely, we prove that the
domain of outer communications of a regular stationary vacuum is isometric to
the domain of outer communications of a Kerr solution, provided that the
stationary Killing v... | [
{
"created": "Mon, 1 Apr 2013 21:41:56 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2013 21:19:41 GMT",
"version": "v2"
}
] | 2015-01-14 | [
[
"Alexakis",
"S.",
""
],
[
"Ionescu",
"A. D.",
""
],
[
"Klainerman",
"S.",
""
]
] | We prove a black hole rigidity result for slowly rotating stationary solutions of the Einstein vacuum equations. More precisely, we prove that the domain of outer communications of a regular stationary vacuum is isometric to the domain of outer communications of a Kerr solution, provided that the stationary Killing vec... |
gr-qc/0702092 | Jose Carlos de Araujo | J. C. N. de Araujo and O. D. Miranda | A solution for galactic disks with Yukawian gravitational potential | 7 pages; 1 eps figure; to appear in General Relativity and
Gravitation | Gen.Rel.Grav.39:777-784,2007 | 10.1007/s10714-007-0420-8 | null | gr-qc astro-ph | null | We present a new solution for the rotation curves of galactic disks with
gravitational potential of the Yukawa type. We follow the technique employed by
Toomre in 1963 in the study of galactic disks in the Newtonian theory. This new
solution allows an easy comparison between the Newtonian solution and the
Yukawian on... | [
{
"created": "Thu, 15 Feb 2007 18:34:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"de Araujo",
"J. C. N.",
""
],
[
"Miranda",
"O. D.",
""
]
] | We present a new solution for the rotation curves of galactic disks with gravitational potential of the Yukawa type. We follow the technique employed by Toomre in 1963 in the study of galactic disks in the Newtonian theory. This new solution allows an easy comparison between the Newtonian solution and the Yukawian one.... |
1402.2534 | N Khusnutdinov | Nail Khusnutdinov | Self-interaction for particles in the wormhole space-times | Talk given in 8th Alexander Friedman International Seminar on
Gravitation and Cosmology, Rio de Janeiro, May 29-June 4, 2011 | Int. J. Mod. Phys. Conf. Series 3, 354-363 (2011) | 10.1142/S2010194511001450 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The self-energy and self-force for particles with electric and scalar charges
at rest in the space-time of massless and massive wormholes are considered. The
particle with electric charge is always attracted to wormhole throat for
arbitrary profile of the throat. The self-force for scalar particle shows
different beh... | [
{
"created": "Tue, 11 Feb 2014 15:47:21 GMT",
"version": "v1"
}
] | 2014-02-12 | [
[
"Khusnutdinov",
"Nail",
""
]
] | The self-energy and self-force for particles with electric and scalar charges at rest in the space-time of massless and massive wormholes are considered. The particle with electric charge is always attracted to wormhole throat for arbitrary profile of the throat. The self-force for scalar particle shows different behav... |
1907.13435 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s} | Overspinning Kerr-MOG black holes by test fields and the third law of
black hole dynamics | Accepted to appear in EPJC | Eur. Phys. J. C (2020) 80:19 | 10.1140/epjc/s10052-020-7607-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the validity of the weak form of the cosmic censorship conjecture
and the third law of black hole dynamics for Kerr-MOG black holes interacting
with scalar test fields. Ignoring backreaction effects, we first show that both
extremal and nearly extremal Kerr-MOG black holes can be overspun into naked
singu... | [
{
"created": "Wed, 24 Jul 2019 23:06:46 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jan 2020 07:36:40 GMT",
"version": "v2"
}
] | 2020-01-17 | [
[
"Düztaş",
"Koray",
""
]
] | We evaluate the validity of the weak form of the cosmic censorship conjecture and the third law of black hole dynamics for Kerr-MOG black holes interacting with scalar test fields. Ignoring backreaction effects, we first show that both extremal and nearly extremal Kerr-MOG black holes can be overspun into naked singula... |
0807.2808 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Emergent diffeomorphism invariance in a discrete loop quantum gravity
model | 12 pages, Revtex | Class.Quant.Grav.26:035002,2009 | 10.1088/0264-9381/26/3/035002 | LSU-REL-071708 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several approaches to the dynamics of loop quantum gravity involve
discretizing the equations of motion. The resulting discrete theories are known
to be problematic since the first class algebra of constraints of the continuum
theory becomes second class upon discretization. If one treats the second class
constraints... | [
{
"created": "Thu, 17 Jul 2008 15:32:36 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | Several approaches to the dynamics of loop quantum gravity involve discretizing the equations of motion. The resulting discrete theories are known to be problematic since the first class algebra of constraints of the continuum theory becomes second class upon discretization. If one treats the second class constraints p... |
0706.4008 | Ingemar Eriksson | Ingemar Eriksson | Conserved Matter Superenergy Currents for Orthogonally Transitive
Abelian G2 Isometry Groups | 15 pages | Class.Quant.Grav.24:4955-4968,2007 | 10.1088/0264-9381/24/20/004 | null | gr-qc | null | In a previous paper we showed that the electromagnetic superenergy tensor,
the Chevreton tensor, gives rise to a conserved current when there is a
hypersurface orthogonal Killing vector present. In addition, the current is
proportional to the Killing vector. The aim of this paper is to extend this
result to the case ... | [
{
"created": "Wed, 27 Jun 2007 12:07:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Eriksson",
"Ingemar",
""
]
] | In a previous paper we showed that the electromagnetic superenergy tensor, the Chevreton tensor, gives rise to a conserved current when there is a hypersurface orthogonal Killing vector present. In addition, the current is proportional to the Killing vector. The aim of this paper is to extend this result to the case wh... |
2408.02251 | Gustav Holzegel | Olivier Graf and Gustav Holzegel | Linear Stability of Schwarzschild-Anti-de Sitter spacetimes I: The
system of gravitational perturbations | null | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the main paper of a series establishing the linear stability of
Schwarzschild-Anti-de Sitter (AdS) black holes to gravitational perturbations.
Specifically, we prove that solutions to the linearisation of the Einstein
equations $\textrm{Ric}(g) = \Lambda g$ with $\Lambda<0$ around a
Schwarzschild-AdS metric a... | [
{
"created": "Mon, 5 Aug 2024 05:51:50 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Graf",
"Olivier",
""
],
[
"Holzegel",
"Gustav",
""
]
] | This is the main paper of a series establishing the linear stability of Schwarzschild-Anti-de Sitter (AdS) black holes to gravitational perturbations. Specifically, we prove that solutions to the linearisation of the Einstein equations $\textrm{Ric}(g) = \Lambda g$ with $\Lambda<0$ around a Schwarzschild-AdS metric ari... |
1202.6561 | Gunther Caspar | Gunther Caspar, Thomas Sch\"onenbach, Peter Otto Hess, Mirko Sch\"afer
and Walter Greiner | Pseudo-Complex General Relativity: Schwarzschild, Reissner-Nordstr\"om
and Kerr Solutions | null | International Journal of Modern Physics E Vol. 21, No. 2 (2012)
1250015 (39 pages) | 10.1142/S0218301312500152 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pseudo-complex General Relativity (pc-GR) is further considered. A new
projection method is proposed. It is shown, that the pc-GR introduces
automatically terms into the system which can be interpreted as dark energy.
The modified pseudo-complex Schwarzschild solution is investigated. The dark
energy part is trea... | [
{
"created": "Wed, 29 Feb 2012 14:52:44 GMT",
"version": "v1"
}
] | 2012-03-01 | [
[
"Caspar",
"Gunther",
""
],
[
"Schönenbach",
"Thomas",
""
],
[
"Hess",
"Peter Otto",
""
],
[
"Schäfer",
"Mirko",
""
],
[
"Greiner",
"Walter",
""
]
] | The pseudo-complex General Relativity (pc-GR) is further considered. A new projection method is proposed. It is shown, that the pc-GR introduces automatically terms into the system which can be interpreted as dark energy. The modified pseudo-complex Schwarzschild solution is investigated. The dark energy part is treate... |
1310.8048 | Alexander Viznyuk | Alexander Viznyuk, Yuri Shtanov, Varun Sahni | A no-boundary proposal for braneworld perturbations | 28 pages, 1 figure | Phys. Rev. D 89, 083523 (2014) | 10.1103/PhysRevD.89.083523 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel approach to the problem of cosmological perturbations in a
braneworld model with induced gravity, which leads to a closed system of
equations on the brane. We focus on a spatially closed brane that bounds the
interior four-ball of the bulk space. The background cosmological evolution on
the brane i... | [
{
"created": "Wed, 30 Oct 2013 07:23:33 GMT",
"version": "v1"
}
] | 2014-04-23 | [
[
"Viznyuk",
"Alexander",
""
],
[
"Shtanov",
"Yuri",
""
],
[
"Sahni",
"Varun",
""
]
] | We propose a novel approach to the problem of cosmological perturbations in a braneworld model with induced gravity, which leads to a closed system of equations on the brane. We focus on a spatially closed brane that bounds the interior four-ball of the bulk space. The background cosmological evolution on the brane is ... |
gr-qc/0201013 | Monica Pierri-Galvao | M. Pierri | Hamiltonian and Volume Operators | Latex, 8 pages | null | null | null | gr-qc | null | 2+1 gravity coupled to a massless scalar field has an initial singularity
when the spatial slices are compact. The quantized model is used here to
investigate several issues of quantum gravity. The spectrum of the volume
operator is studied at the initial singularity. The energy spectrum is
obtained. Dynamics of the ... | [
{
"created": "Fri, 4 Jan 2002 11:13:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pierri",
"M.",
""
]
] | 2+1 gravity coupled to a massless scalar field has an initial singularity when the spatial slices are compact. The quantized model is used here to investigate several issues of quantum gravity. The spectrum of the volume operator is studied at the initial singularity. The energy spectrum is obtained. Dynamics of the un... |
2101.04592 | Barry Wardell | Adam Pound and Barry Wardell | Black hole perturbation theory and gravitational self-force | 121 pages, 1 figure. Invited chapter for "Handbook of Gravitational
Wave Astronomy" (Eds. C. Bambi, S. Katsanevas, and K. Kokkotas; Springer,
Singapore, 2021). v4 typos corrected | null | 10.1007/978-981-15-4702-7_38-1 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Much of the success of gravitational-wave astronomy rests on perturbation
theory. Historically, perturbative analysis of gravitational-wave sources has
largely focused on post-Newtonian theory. However, strong-field perturbation
theory is essential in many cases such as the quasinormal ringdown following
the merger o... | [
{
"created": "Tue, 12 Jan 2021 16:44:53 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jun 2021 13:15:05 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Sep 2021 22:23:54 GMT",
"version": "v3"
},
{
"created": "Thu, 25 Jan 2024 01:29:56 GMT",
"version": "v4"
}
] | 2024-01-26 | [
[
"Pound",
"Adam",
""
],
[
"Wardell",
"Barry",
""
]
] | Much of the success of gravitational-wave astronomy rests on perturbation theory. Historically, perturbative analysis of gravitational-wave sources has largely focused on post-Newtonian theory. However, strong-field perturbation theory is essential in many cases such as the quasinormal ringdown following the merger of ... |
0709.2925 | Leonardo Gualtieri | V. Ferrari, L. Gualtieri, S. Marassi | A new approach to the study of quasi-normal modes of rotating stars | 24 pages, 7 figures, submitted to Phys. Rev. D | Phys.Rev.D76:104033,2007 | 10.1103/PhysRevD.76.104033 | null | gr-qc astro-ph | null | We propose a new method to study the quasi-normal modes of rotating
relativistic stars. Oscillations are treated as perturbations in the frequency
domain of the stationary, axisymmetric background describing a rotating star.
The perturbed quantities are expanded in circular harmonics, and the resulting
2D-equations t... | [
{
"created": "Tue, 18 Sep 2007 22:09:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ferrari",
"V.",
""
],
[
"Gualtieri",
"L.",
""
],
[
"Marassi",
"S.",
""
]
] | We propose a new method to study the quasi-normal modes of rotating relativistic stars. Oscillations are treated as perturbations in the frequency domain of the stationary, axisymmetric background describing a rotating star. The perturbed quantities are expanded in circular harmonics, and the resulting 2D-equations the... |
2011.09623 | Celia Escamilla-Rivera | N. M. Jim\'enez Cruz and Celia Escamilla-Rivera | Late-time and Big Bang nucleosynthesis constraints for generic modify
gravity surveys | 23 pages, 17 figures. Version accepted in EPJP | null | 10.1140/epjp/s13360-020-00950-3 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, a new generic parameterisation for $f(R)$ theories is
presented. Our proposal for a new equation of state can reproduce an
$f(R)$-like evolution that describes late and early time universe within
1-$\sigma$ C.L when we use a combination of distance ladder measurements based
on Cosmic Chronometers, Super... | [
{
"created": "Thu, 19 Nov 2020 02:56:22 GMT",
"version": "v1"
}
] | 2020-11-20 | [
[
"Cruz",
"N. M. Jiménez",
""
],
[
"Escamilla-Rivera",
"Celia",
""
]
] | In this work, a new generic parameterisation for $f(R)$ theories is presented. Our proposal for a new equation of state can reproduce an $f(R)$-like evolution that describes late and early time universe within 1-$\sigma$ C.L when we use a combination of distance ladder measurements based on Cosmic Chronometers, Superno... |
2001.08491 | Ingemar Bengtsson | Ingemar Bengtsson | The Hawking energy on photon surfaces | 9 pages; improved by two referees | Gen. Relativ. Gravit. (2020) 52:52 | 10.1007/s10714-020-02703-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hawking energy has a monotonicity property under the inverse mean
curvature flow on totally umbilic hypersurfaces with constant scalar curvature
in Einstein spaces. It grows if the hypersurface is spacelike, and decreases if
it is timelike. Timelike examples include Minkowski and de Sitter hyperboloids,
and photo... | [
{
"created": "Thu, 23 Jan 2020 13:18:23 GMT",
"version": "v1"
},
{
"created": "Fri, 22 May 2020 20:01:25 GMT",
"version": "v2"
}
] | 2020-06-23 | [
[
"Bengtsson",
"Ingemar",
""
]
] | The Hawking energy has a monotonicity property under the inverse mean curvature flow on totally umbilic hypersurfaces with constant scalar curvature in Einstein spaces. It grows if the hypersurface is spacelike, and decreases if it is timelike. Timelike examples include Minkowski and de Sitter hyperboloids, and photon ... |
gr-qc/0312095 | Beverly K. Berger | Beverly K. Berger | Hunting Local Mixmaster Dynamics in Spatially Inhomogeneous Cosmologies | 17 pages, 5 figures. Contribution to CQG Special Issue "A Spacetime
Safari: Essays in Honour of Vincent Moncrief" | Class.Quant.Grav. 21 (2004) S81-S96 | 10.1088/0264-9381/21/3/006 | null | gr-qc | null | Heuristic arguments and numerical simulations support the Belinskii et al
(BKL) claim that the approach to the singularity in generic gravitational
collapse is characterized by local Mixmaster dynamics (LMD). Here, one way to
identify LMD in collapsing spatially inhomogeneous cosmologies is explored. By
writing the m... | [
{
"created": "Sat, 20 Dec 2003 22:24:44 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Berger",
"Beverly K.",
""
]
] | Heuristic arguments and numerical simulations support the Belinskii et al (BKL) claim that the approach to the singularity in generic gravitational collapse is characterized by local Mixmaster dynamics (LMD). Here, one way to identify LMD in collapsing spatially inhomogeneous cosmologies is explored. By writing the met... |
gr-qc/9805067 | Dharam V. Ahluwalia | D. V. Ahluwalia | Can general-relativistic description of gravitation be considered
complete? | Essay Awarded "Honorable Mention" by Gravity Research Foundation
(1998). The answer to the question posed in the title is an experimentally
verifiable "no." | Mod.Phys.Lett.A13:1393-1400,1998 | 10.1142/S0217732398001455 | LA-UR-98-1159 | gr-qc astro-ph hep-ph hep-th quant-ph | null | The local galactic cluster, the Great attractor, embeds us in a dimensionless
gravitational potential of about - 3 x 10^{-5}. In the solar system this
potential is constant to about 1 part in 10^{11}. Consequently, planetary
orbits, which are determined by the gradient in the gravitational potential,
remain unaffecte... | [
{
"created": "Mon, 18 May 1998 15:36:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ahluwalia",
"D. V.",
""
]
] | The local galactic cluster, the Great attractor, embeds us in a dimensionless gravitational potential of about - 3 x 10^{-5}. In the solar system this potential is constant to about 1 part in 10^{11}. Consequently, planetary orbits, which are determined by the gradient in the gravitational potential, remain unaffected.... |
1309.5510 | Gines Perez Teruel | Gin\'es R. P\'erez Teruel | An alternative formulation of Classical Mechanics based on an analogy
with Thermodynamics | null | null | 10.1088/0143-0807/34/6/1589 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study new Legendre transforms in classical mechanics and investigate some
of their general properties. The behaviour of the new functions is analyzed
under coordinate transformations.When invariance under different kinds of
transformations are considered, the new formulation is found to be completly
equivalent to ... | [
{
"created": "Sat, 21 Sep 2013 18:24:20 GMT",
"version": "v1"
}
] | 2013-10-23 | [
[
"Teruel",
"Ginés R. Pérez",
""
]
] | We study new Legendre transforms in classical mechanics and investigate some of their general properties. The behaviour of the new functions is analyzed under coordinate transformations.When invariance under different kinds of transformations are considered, the new formulation is found to be completly equivalent to th... |
gr-qc/9410002 | V. V. Zhytnikov | Vadim V. Zhytnikov and James M. Nester | Can Galactic Observations Be Explained by a Relativistic Gravity Theory? | 12p, REVTeX 3.0 | Phys.Rev.Lett. 73 (1994) 2950-2953 | 10.1103/PhysRevLett.73.2950 | null | gr-qc | null | We consider the possibility of an alternative gravity theory explaining the
dynamics of galactic systems without dark matter. From very general assumptions
about the structure of a relativistic gravity theory we derive a general
expression for the metric to order $(v/c)^2$. This allows us to compare the
predictions o... | [
{
"created": "Tue, 4 Oct 1994 06:10:16 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Zhytnikov",
"Vadim V.",
""
],
[
"Nester",
"James M.",
""
]
] | We consider the possibility of an alternative gravity theory explaining the dynamics of galactic systems without dark matter. From very general assumptions about the structure of a relativistic gravity theory we derive a general expression for the metric to order $(v/c)^2$. This allows us to compare the predictions of ... |
1802.00885 | Michael Coughlin | Michael W. Coughlin, Alessio Cirone, Patrick Meyers, Sho Atsuta,
Valerio Boschi, Andrea Chincarini, Nelson L. Christensen, Rosario De Rosa,
Anamaria Effler, Irene Fiori, Mark Golkowski, Melissa Guidry, Jan Harms,
Kazuhiro Hayama, Yuu Kataoka, Jerzy Kubisz, Andrzej Kulak, Michael Laxen,
Andrew Matas, Janusz Mlyn... | Measurement and subtraction of Schumann resonances at gravitational-wave
interferometers | null | Phys. Rev. D 97, 102007 (2018) | 10.1103/PhysRevD.97.102007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Correlated magnetic noise from Schumann resonances threatens to contaminate
the observation of a stochastic gravitational-wave background in
interferometric detectors. In previous work, we reported on the first effort to
eliminate global correlated noise from the Schumann resonances using Wiener
filtering, demonstrat... | [
{
"created": "Sat, 3 Feb 2018 00:30:54 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2018 01:27:36 GMT",
"version": "v2"
}
] | 2018-06-06 | [
[
"Coughlin",
"Michael W.",
""
],
[
"Cirone",
"Alessio",
""
],
[
"Meyers",
"Patrick",
""
],
[
"Atsuta",
"Sho",
""
],
[
"Boschi",
"Valerio",
""
],
[
"Chincarini",
"Andrea",
""
],
[
"Christensen",
"Nelson L.",
... | Correlated magnetic noise from Schumann resonances threatens to contaminate the observation of a stochastic gravitational-wave background in interferometric detectors. In previous work, we reported on the first effort to eliminate global correlated noise from the Schumann resonances using Wiener filtering, demonstratin... |
2306.10969 | Raja Solanki | Raja Solanki, Zinnat Hassan, P.K. Sahoo | Wormhole solutions in $f(R,L_m)$ gravity | Chinese Journal of Physics published version | Chinese Journal of Physics, 85 (2023) 74-88 | 10.1016/j.cjph.2023.06.005 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we intend to explore wormhole geometries in the framework of
$f(R,L_m)$ gravity. We derive the field equations for the generic $f(R,L_m)$
function by assuming the static and spherically symmetric Morris-Thorne
wormhole metric. Then we consider two non-linear $f(R,L_m)$ model,
specifically, $f(R,L_m)=\fr... | [
{
"created": "Mon, 19 Jun 2023 14:31:36 GMT",
"version": "v1"
}
] | 2023-08-01 | [
[
"Solanki",
"Raja",
""
],
[
"Hassan",
"Zinnat",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this work, we intend to explore wormhole geometries in the framework of $f(R,L_m)$ gravity. We derive the field equations for the generic $f(R,L_m)$ function by assuming the static and spherically symmetric Morris-Thorne wormhole metric. Then we consider two non-linear $f(R,L_m)$ model, specifically, $f(R,L_m)=\frac... |
0912.1393 | Muhammad Sharif | M. Sharif and M. Farasat Shamir | Plane Symmetric Solutions in f(R) Gravity | 10 pages, accepted for publication in Mod. Phys. Lett. A | Mod.Phys.Lett.A25:1281-1288,2010 | 10.1142/S0217732310032536 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modified theories of gravity, especially the f(R) theory, have attracted
much attention in recent years. In this context, we explore static plane
symmetric vacuum solutions using the metric approach of this theory. The field
equations are solved using the assumption of constant scalar curvature which
may be zero ... | [
{
"created": "Tue, 8 Dec 2009 03:09:30 GMT",
"version": "v1"
}
] | 2010-06-21 | [
[
"Sharif",
"M.",
""
],
[
"Shamir",
"M. Farasat",
""
]
] | The modified theories of gravity, especially the f(R) theory, have attracted much attention in recent years. In this context, we explore static plane symmetric vacuum solutions using the metric approach of this theory. The field equations are solved using the assumption of constant scalar curvature which may be zero or... |
gr-qc/0005077 | Mohammad Vahid Takook | M. V. Takook | Spin 1/2 Field Theory in the de Sitter space-time | 7 pages, Proceedings of the Group 21, 15-20 july 1996, Goslar,
Germany | null | null | null | gr-qc | null | A covariant quantization of the free spinor fields (s=1/2) in 4-dimensional
de Sitter (dS) space-time based on analyticity in the complexified
pseudo-Riemanian manifold is presented. We define the Wigthman two-point
function ${\cal W}(x,y)$, which satisfies the conditions of: a) positivity, b)
locality, c) covariance... | [
{
"created": "Wed, 17 May 2000 05:25:35 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Takook",
"M. V.",
""
]
] | A covariant quantization of the free spinor fields (s=1/2) in 4-dimensional de Sitter (dS) space-time based on analyticity in the complexified pseudo-Riemanian manifold is presented. We define the Wigthman two-point function ${\cal W}(x,y)$, which satisfies the conditions of: a) positivity, b) locality, c) covariance, ... |
1703.03958 | Luis Herrera | L. Herrera | The Gibbs paradox, the Landauer principle and the irreversibility
associated with tilted observers | 10 pages Latex. Invited contribution for the special issue "Advances
in Relativistic Statistical Mechanics" published in Entropy | Entropy, 19,110, (2017) | 10.3390/e19030110 | null | gr-qc astro-ph.CO physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that, in the context of General Relativity, some spacetimes,
when described by a congruence of comoving observers, may consist in a
distribution of a perfect (non-dissipative) fluid, whereas the same spacetime
as seen by a "tilted"' (Lorentz-boosted) congruence of observers, may exhibit
the presence ... | [
{
"created": "Sat, 11 Mar 2017 11:34:36 GMT",
"version": "v1"
}
] | 2017-03-14 | [
[
"Herrera",
"L.",
""
]
] | It is well known that, in the context of General Relativity, some spacetimes, when described by a congruence of comoving observers, may consist in a distribution of a perfect (non-dissipative) fluid, whereas the same spacetime as seen by a "tilted"' (Lorentz-boosted) congruence of observers, may exhibit the presence of... |
gr-qc/0307045 | Dr. Anirudh Pradhan | Anirudh Pradhan and Abha Rai | Tilted Bianchi Type V Bulk Viscous Cosmological Models in General
Relativity | 14 pages | Astrophys.Space Sci. 291 (2004) 149-160 | 10.1023/B:astr.0000032069.58003.b4 | null | gr-qc | null | Conformally flat tilted Bianchi type V cosmological models in presence of a
bulk viscous fluid and heat flow are investigated. The coefficient of bulk
viscosity is assumed to be a power function of mass density. Some physical and
geometric aspects of the models are also discussed.
| [
{
"created": "Thu, 10 Jul 2003 04:15:34 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Rai",
"Abha",
""
]
] | Conformally flat tilted Bianchi type V cosmological models in presence of a bulk viscous fluid and heat flow are investigated. The coefficient of bulk viscosity is assumed to be a power function of mass density. Some physical and geometric aspects of the models are also discussed. |
2407.18410 | Igor Khavkine | Igor Khavkine, David McNutt, Lode Wylleman | IDEAL characterization of vacuum pp-waves | 47pp, tikz figures | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | An IDEAL characterization of a particular spacetime metric, $g_0$, consists
of a set of tensorial equations $T[g] = 0$ arising from expressions constructed
from the metric, $g$, its curvature tensor and its covariant derivatives and
which are satisfied if and only if $g$ is locally isometric to the original
metric $g... | [
{
"created": "Thu, 25 Jul 2024 21:47:25 GMT",
"version": "v1"
}
] | 2024-07-29 | [
[
"Khavkine",
"Igor",
""
],
[
"McNutt",
"David",
""
],
[
"Wylleman",
"Lode",
""
]
] | An IDEAL characterization of a particular spacetime metric, $g_0$, consists of a set of tensorial equations $T[g] = 0$ arising from expressions constructed from the metric, $g$, its curvature tensor and its covariant derivatives and which are satisfied if and only if $g$ is locally isometric to the original metric $g_0... |
2312.06783 | Soumodeep Mitra | Soumodeep Mitra, Sumanta Chakraborty, Rodrigo Vicente, and Justin C.
Feng | Probing the quantum nature of black holes with ultra-light boson
environments | v2, 15 pages, 2 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Quantum black holes (BHs), thought of as an excited multilevel system, can be
effectively modelled by replacing an event horizon with a partially reflective
membrane. This emergent feature affects their interaction with hosting
environments, with the most pronounced effects happening for environments of
particles wit... | [
{
"created": "Mon, 11 Dec 2023 19:01:43 GMT",
"version": "v1"
},
{
"created": "Mon, 20 May 2024 04:35:28 GMT",
"version": "v2"
}
] | 2024-05-21 | [
[
"Mitra",
"Soumodeep",
""
],
[
"Chakraborty",
"Sumanta",
""
],
[
"Vicente",
"Rodrigo",
""
],
[
"Feng",
"Justin C.",
""
]
] | Quantum black holes (BHs), thought of as an excited multilevel system, can be effectively modelled by replacing an event horizon with a partially reflective membrane. This emergent feature affects their interaction with hosting environments, with the most pronounced effects happening for environments of particles with ... |
gr-qc/0111094 | Carlos Augusto Romero Filho | E. Anderson, F. Dahia, James E. Lidsey, and C. Romero | Embeddings in Spacetimes Sourced by Scalar Fields | RevTEX (11 pages)/ To appear in the Journal of Mathematical Physics | J.Math.Phys.44:5108-5119,2003 | 10.1063/1.1610237 | null | gr-qc | null | The extension of the Campbell-Magaard embedding theorem to general relativity
with minimally-coupled scalar fields is formulated and proven. The result is
applied to the case of a self-interacting scalar field for which new embeddings
are found, and to Brans-Dicke theory. The relationship between Campbell-Magaard
the... | [
{
"created": "Tue, 27 Nov 2001 18:23:41 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2003 17:15:41 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Anderson",
"E.",
""
],
[
"Dahia",
"F.",
""
],
[
"Lidsey",
"James E.",
""
],
[
"Romero",
"C.",
""
]
] | The extension of the Campbell-Magaard embedding theorem to general relativity with minimally-coupled scalar fields is formulated and proven. The result is applied to the case of a self-interacting scalar field for which new embeddings are found, and to Brans-Dicke theory. The relationship between Campbell-Magaard theor... |
1708.07325 | Robert Owen | Robert Owen, Alex S. Fox, John A. Freiberg, Terrence Pierre Jacques | Black Hole Spin Axis in Numerical Relativity | 21 pages, 14 figures. Version 2 is a substantial revision, with a
much better treatment of rotation generators. Version 2 submitted to PRD | Phys. Rev. D 99, 084031 (2019) | 10.1103/PhysRevD.99.084031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Colliding black holes are systems of profound interest in both gravitational
wave astronomy and in gravitation theory, and a variety of methods have been
developed for modeling their dynamics in detail. The features of these dynamics
are determined by the masses of the holes and by the magnitudes and axes of
their sp... | [
{
"created": "Thu, 24 Aug 2017 09:07:08 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2018 01:16:00 GMT",
"version": "v2"
}
] | 2019-04-24 | [
[
"Owen",
"Robert",
""
],
[
"Fox",
"Alex S.",
""
],
[
"Freiberg",
"John A.",
""
],
[
"Jacques",
"Terrence Pierre",
""
]
] | Colliding black holes are systems of profound interest in both gravitational wave astronomy and in gravitation theory, and a variety of methods have been developed for modeling their dynamics in detail. The features of these dynamics are determined by the masses of the holes and by the magnitudes and axes of their spin... |
2104.11343 | Robie Hennigar | Ivan Booth, Robie A. Hennigar, Daniel Pook-Kolb | Ultimate fate of apparent horizons during a binary black hole merger I:
Locating and understanding axisymmetric marginally outer trapped surfaces | 19 pages, 10 figures | null | 10.1103/PhysRevD.104.084083 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In classical numerical relativity, marginally outer trapped surfaces (MOTSs)
are the main tool to locate and characterize black holes. For five decades it
has been known that during a binary merger, a new outer horizon forms around
the initial apparent horizons of the individual holes once they are
sufficiently close... | [
{
"created": "Thu, 22 Apr 2021 22:57:18 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"Booth",
"Ivan",
""
],
[
"Hennigar",
"Robie A.",
""
],
[
"Pook-Kolb",
"Daniel",
""
]
] | In classical numerical relativity, marginally outer trapped surfaces (MOTSs) are the main tool to locate and characterize black holes. For five decades it has been known that during a binary merger, a new outer horizon forms around the initial apparent horizons of the individual holes once they are sufficiently close t... |
gr-qc/0104003 | Michael Heller | M. Heller, W. Sasin, Z. Odrzygozdz | Noncommutative regime of fundamental physics | LaTex, 38 pages | null | null | CGC 07/01 | gr-qc | null | We further develop a model unifying general relativity with quantum mechanics
proposed in our earlier papers (J. Math. Phys. 38, 5840 (1998); 41, 5168
(2000)). The model is based on a noncommutative algebra $A$ defined on a
groupoid $\Gamma = E \times G$ where $E$ is the total space of a fibre bundle
over space-time ... | [
{
"created": "Mon, 2 Apr 2001 09:37:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Heller",
"M.",
""
],
[
"Sasin",
"W.",
""
],
[
"Odrzygozdz",
"Z.",
""
]
] | We further develop a model unifying general relativity with quantum mechanics proposed in our earlier papers (J. Math. Phys. 38, 5840 (1998); 41, 5168 (2000)). The model is based on a noncommutative algebra $A$ defined on a groupoid $\Gamma = E \times G$ where $E$ is the total space of a fibre bundle over space-time an... |
2210.09265 | Yongqiang Wang | Shi-Xian Sun, Yong-Qiang Wang, Li Zhao | Chains of mini-boson stars | 15 pages, 5 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we re-investigate the stationary, soliton-like solutions in
the model of the Einstein gravity coupled to a free and complex scalar field,
which have been known as mini-boson stars. With numerical method, we find that
in addition to the usual single mini-boson star solution, there exist a novel
family o... | [
{
"created": "Mon, 17 Oct 2022 17:14:08 GMT",
"version": "v1"
}
] | 2022-10-18 | [
[
"Sun",
"Shi-Xian",
""
],
[
"Wang",
"Yong-Qiang",
""
],
[
"Zhao",
"Li",
""
]
] | In this paper, we re-investigate the stationary, soliton-like solutions in the model of the Einstein gravity coupled to a free and complex scalar field, which have been known as mini-boson stars. With numerical method, we find that in addition to the usual single mini-boson star solution, there exist a novel family of ... |
1509.05357 | Alexei Deriglazov A | Alexei A. Deriglazov and Walberto Guzm\'an Ram\'irez | Mathisson-Papapetrou-Tulczyjew-Dixon (MPTD) equations in
ultra-relativistic regime and gravimagnetic moment | 5 pages, typos corrected, close to published version | International Journal of Modern Physics D Vol. 26 (2017) 1750047
(12 pages) | 10.1142/S021827181750047X | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mathisson-Papapetrou-Tulczyjew-Dixon (MPTD) equations in the Lagrangian
formulation correspond to the minimal interaction of spin with gravity. Due to
the interaction, in the Lagrangian equations instead of the original metric $g$
emerges spin-dependent effective metric $G=g+h(S)$. So we need to decide, which
of them... | [
{
"created": "Thu, 17 Sep 2015 18:24:13 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2016 13:04:45 GMT",
"version": "v2"
}
] | 2016-11-10 | [
[
"Deriglazov",
"Alexei A.",
""
],
[
"Ramírez",
"Walberto Guzmán",
""
]
] | Mathisson-Papapetrou-Tulczyjew-Dixon (MPTD) equations in the Lagrangian formulation correspond to the minimal interaction of spin with gravity. Due to the interaction, in the Lagrangian equations instead of the original metric $g$ emerges spin-dependent effective metric $G=g+h(S)$. So we need to decide, which of them t... |
gr-qc/9903090 | Doc. Ing. Jozef Sima DRSc. | Jozef Sima and Miroslav Sukenik | The expansive nondecelerative universe - Gravitational effects and their
manifestation in black holes evaporation and far-infrared spectra | 7 pages, AmsTex | null | null | SS-99-01 | gr-qc | null | The paper summarizes the background of Expensive Nondecelerative Universe
model and its main consequences for gravitation. Applying the Vaidya metrics,
the model allows for the localization and determination of the density and
quantity of gravitational energy created by a body with the mass m in the
distance r. The c... | [
{
"created": "Wed, 24 Mar 1999 12:20:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sima",
"Jozef",
""
],
[
"Sukenik",
"Miroslav",
""
]
] | The paper summarizes the background of Expensive Nondecelerative Universe model and its main consequences for gravitation. Applying the Vaidya metrics, the model allows for the localization and determination of the density and quantity of gravitational energy created by a body with the mass m in the distance r. The con... |
0709.1630 | Paul Frampton | Paul Frampton | Comment on ``Can Black Holes be Torn Up by a Phantom in Cyclic
Cosmology?" by X. Zhang. arXiv:0708.1408 [gr-qc] | 3 pages latex | null | null | null | gr-qc | null | In a recently archived paper by Zhang\cite{Zhang}, it is claimed that before
turnaround in a cyclic model two unexpected events happen: (1) black holes
cease to contract and begin to expand; (2) separated causal patches start to
reconnect. We show that both conclusions are erroneous and result from the
author's choic... | [
{
"created": "Tue, 11 Sep 2007 13:59:49 GMT",
"version": "v1"
}
] | 2007-09-12 | [
[
"Frampton",
"Paul",
""
]
] | In a recently archived paper by Zhang\cite{Zhang}, it is claimed that before turnaround in a cyclic model two unexpected events happen: (1) black holes cease to contract and begin to expand; (2) separated causal patches start to reconnect. We show that both conclusions are erroneous and result from the author's choice ... |
gr-qc/9810025 | Dmitry Korotkin | M.V.Babich and D.A.Korotkin | Self-dual SU(2) invariant Einstein metrics and modular dependence of
theta-functions | Misprints corrected | Lett.Math.Phys. 46 (1998) 323-337 | null | AEI-088 | gr-qc math.DG nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We simplify Hitchin's description of SU(2)-invariant self-dual Einstein
metrics, making use of the tau-function of related four-pole Schlesinger
system.
| [
{
"created": "Wed, 7 Oct 1998 20:42:42 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Mar 2014 00:52:03 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Oct 2023 15:16:41 GMT",
"version": "v3"
}
] | 2023-10-25 | [
[
"Babich",
"M. V.",
""
],
[
"Korotkin",
"D. A.",
""
]
] | We simplify Hitchin's description of SU(2)-invariant self-dual Einstein metrics, making use of the tau-function of related four-pole Schlesinger system. |
gr-qc/0504144 | Husnu Baysal | H. Baysal and I. Yilmaz | Timelike and Spacelike Ricci Collineation Vectors in String Fluid | 10 pages | null | null | null | gr-qc | null | We study the consequences of the existence of timelike and spacelike Ricci
collineation vectors (RCVs) for string fluid in the context of general
relativity. Necessary and sufficient conditions are derived for a space-time
with string fluid to admit a timelike RCV, parallel to $u^a$, and a spacelike
RCV, parallel to ... | [
{
"created": "Fri, 29 Apr 2005 12:38:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baysal",
"H.",
""
],
[
"Yilmaz",
"I.",
""
]
] | We study the consequences of the existence of timelike and spacelike Ricci collineation vectors (RCVs) for string fluid in the context of general relativity. Necessary and sufficient conditions are derived for a space-time with string fluid to admit a timelike RCV, parallel to $u^a$, and a spacelike RCV, parallel to $n... |
1711.08380 | Carlos M. Sendra | Ernesto F. Eiroa, Carlos M. Sendra | Shadow cast by rotating braneworld black holes with a cosmological
constant | 12 pages, 4 figures; v2: minor changes | Eur. Phys. J. C (2018) 78:91 | 10.1140/epjc/s10052-018-5586-6 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the shadow produced by rotating black holes with a
tidal charge in a Randall-Sundrum braneworld model, with a cosmological
constant. We obtain the apparent shape and the corresponding observables for
different values of the tidal charge and the rotation parameter, and we analyze
the influenc... | [
{
"created": "Wed, 22 Nov 2017 16:38:58 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 17:00:07 GMT",
"version": "v2"
}
] | 2018-02-02 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"Sendra",
"Carlos M.",
""
]
] | In this article, we study the shadow produced by rotating black holes with a tidal charge in a Randall-Sundrum braneworld model, with a cosmological constant. We obtain the apparent shape and the corresponding observables for different values of the tidal charge and the rotation parameter, and we analyze the influence ... |
1501.07274 | Emanuele Berti | Emanuele Berti, Enrico Barausse, Vitor Cardoso, Leonardo Gualtieri,
Paolo Pani, Ulrich Sperhake, Leo C. Stein, Norbert Wex, Kent Yagi, Tessa
Baker, C. P. Burgess, Fl\'avio S. Coelho, Daniela Doneva, Antonio De Felice,
Pedro G. Ferreira, Paulo C. C. Freire, James Healy, Carlos Herdeiro, Michael
Horbatsch, Burkha... | Testing General Relativity with Present and Future Astrophysical
Observations | 188 pages, 46 figures, 6 tables, 903 references. Matches version
published in Classical and Quantum Gravity. Supplementary data files
available at http://www.phy.olemiss.edu/~berti/research/ and
http://centra.tecnico.ulisboa.pt/network/grit/files/ | Class. Quantum Grav. 32, 243001 (2015) | 10.1088/0264-9381/32/24/243001 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One century after its formulation, Einstein's general relativity has made
remarkable predictions and turned out to be compatible with all experimental
tests. Most of these tests probe the theory in the weak-field regime, and there
are theoretical and experimental reasons to believe that general relativity
should be m... | [
{
"created": "Wed, 28 Jan 2015 21:00:11 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2015 17:23:39 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Sep 2015 23:43:01 GMT",
"version": "v3"
},
{
"created": "Wed, 2 Dec 2015 03:09:26 GMT",
"version": "v4"
}
] | 2015-12-03 | [
[
"Berti",
"Emanuele",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Pani",
"Paolo",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Stein",
"Leo C.",
""
],
[
... | One century after its formulation, Einstein's general relativity has made remarkable predictions and turned out to be compatible with all experimental tests. Most of these tests probe the theory in the weak-field regime, and there are theoretical and experimental reasons to believe that general relativity should be mod... |
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