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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1104.5229 | Benjamin Shlaer | Jose J. Blanco-Pillado, Handhika S. Ramadhan, and Benjamin Shlaer | Bubbles from Nothing | 19 pages, 6 figures | null | 10.1088/1475-7516/2012/01/045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of flux compactifications, we construct an instanton
describing the quantum creation of an open universe from nothing. The solution
has many features in common with the smooth 6d bubble of nothing solutions
discussed recently, where the spacetime is described by a 4d compactification
of a 6d Eins... | [
{
"created": "Wed, 27 Apr 2011 20:00:01 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Blanco-Pillado",
"Jose J.",
""
],
[
"Ramadhan",
"Handhika S.",
""
],
[
"Shlaer",
"Benjamin",
""
]
] | Within the framework of flux compactifications, we construct an instanton describing the quantum creation of an open universe from nothing. The solution has many features in common with the smooth 6d bubble of nothing solutions discussed recently, where the spacetime is described by a 4d compactification of a 6d Einste... |
gr-qc/9804085 | Beverly K. Berger | Beverly K. Berger and Vincent Moncrief | Evidence for an oscillatory singularity in generic U(1) symmetric
cosmologies on $T^3 \times R$ | 15 pages, Revtex, includes 12 figures, psfig. High resolution
versions of figures 7, 8, 9, and 11 may be obtained from anonymous ftp to
ftp://vela.acs.oakland.edu/pub/berger/u1genfigs | Phys.Rev. D58 (1998) 064023 | 10.1103/PhysRevD.58.064023 | null | gr-qc | null | A longstanding conjecture by Belinskii, Lifshitz, and Khalatnikov that the
singularity in generic gravitational collapse is locally oscillatory is tested
numerically in vacuum, U(1) symmetric cosmological spacetimes on $T^3 \times
R$. If the velocity term dominated (VTD) solution to Einstein's equations is
substitute... | [
{
"created": "Thu, 30 Apr 1998 17:53:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Berger",
"Beverly K.",
""
],
[
"Moncrief",
"Vincent",
""
]
] | A longstanding conjecture by Belinskii, Lifshitz, and Khalatnikov that the singularity in generic gravitational collapse is locally oscillatory is tested numerically in vacuum, U(1) symmetric cosmological spacetimes on $T^3 \times R$. If the velocity term dominated (VTD) solution to Einstein's equations is substituted ... |
2110.13897 | Saqib Hussain | Sidra Shafiq, Saqib Hussain, Muhammad Ozair, Adnan Aslam, Takasar
Hussain | Charged particle dynamics in the surrounding of Schwarzschild anti-de
Sitter black hole with topological defect immersed in an external magnetic
field | 10 pages, 7 figures | Eur. Phys. J. C (2020) 80:744 | 10.1140/epjc/s10052-020-8314-y | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | In this paper, geodesic motion of the charged particles in the vicinity of
event horizon of Schwarzschild anti-de-Sitter black hole (BH) with topological
defects has been investigated. Weakly magnetized environment is considered in
the surrounding of BH which only effects the motion of the particles and
doesn't effec... | [
{
"created": "Tue, 26 Oct 2021 17:50:06 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"Shafiq",
"Sidra",
""
],
[
"Hussain",
"Saqib",
""
],
[
"Ozair",
"Muhammad",
""
],
[
"Aslam",
"Adnan",
""
],
[
"Hussain",
"Takasar",
""
]
] | In this paper, geodesic motion of the charged particles in the vicinity of event horizon of Schwarzschild anti-de-Sitter black hole (BH) with topological defects has been investigated. Weakly magnetized environment is considered in the surrounding of BH which only effects the motion of the particles and doesn't effect ... |
1204.1786 | XiaoXiong Zeng | Xian-Ming Liu, Xiao-Xiong Zeng, Wen-Biao Liu | Spectroscopy of the rotating BTZ black hole via adiabatic invariance | 6 pages, 0 figures, to appear in Sci China Ser G-Phys Mech Astron.
arXiv admin note: text overlap with arXiv:1106.2292 | Sci China-Phys Mech Astron, 2012, 55: 1--4 | 10.1007/s11433-012-4836-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to Bohr-Sommerfeld quantization rule, an equally spaced horizon
area spectrum of a static, spherically symmetric black hole was obtained under
an adiabatic invariant action. This method can be extended to the rotating
black holes. As an example, we apply this method to the rotating BTZ black hole
and obtain... | [
{
"created": "Mon, 9 Apr 2012 03:07:38 GMT",
"version": "v1"
}
] | 2012-07-25 | [
[
"Liu",
"Xian-Ming",
""
],
[
"Zeng",
"Xiao-Xiong",
""
],
[
"Liu",
"Wen-Biao",
""
]
] | According to Bohr-Sommerfeld quantization rule, an equally spaced horizon area spectrum of a static, spherically symmetric black hole was obtained under an adiabatic invariant action. This method can be extended to the rotating black holes. As an example, we apply this method to the rotating BTZ black hole and obtain t... |
1806.08850 | R. R. Cuzinatto | R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros, and P. J. Pompeia | $f\left(R,\nabla_{\mu_{1}}R,\dots,\nabla_{\mu_{1}}\dots\nabla_{\mu_{n}}R\right)$
theories of gravity in Einstein frame: A higher order modified Starobinsky
inflation model in the Palatini approach | 13 pages; v2: references added; v3: extended to 23 pages, new section
with application to inflation, 4 figures, additional references, few
corrections; v4: matches the published version | Phys. Rev. D 99, 084053 (2019) | 10.1103/PhysRevD.99.084053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Cuzinatto et al. [Phys. Rev. D 93, 124034 (2016)], it has been
demonstrated that theories of gravity in which the Lagrangian includes terms
depending on the scalar curvature $R$ and its derivatives up to order $n$, i.e.
$f\left(R,\nabla_{\mu}R,\nabla_{\mu_{1}}\nabla_{\mu_{2}}R,\dots,\nabla_{\mu_{1}}\dots\nabla_{\m... | [
{
"created": "Fri, 22 Jun 2018 20:48:12 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2018 22:09:06 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Feb 2019 20:41:49 GMT",
"version": "v3"
},
{
"created": "Sun, 5 May 2019 20:50:20 GMT",
"version": "v4"
}
] | 2019-05-07 | [
[
"Cuzinatto",
"R. R.",
""
],
[
"de Melo",
"C. A. M.",
""
],
[
"Medeiros",
"L. G.",
""
],
[
"Pompeia",
"P. J.",
""
]
] | In Cuzinatto et al. [Phys. Rev. D 93, 124034 (2016)], it has been demonstrated that theories of gravity in which the Lagrangian includes terms depending on the scalar curvature $R$ and its derivatives up to order $n$, i.e. $f\left(R,\nabla_{\mu}R,\nabla_{\mu_{1}}\nabla_{\mu_{2}}R,\dots,\nabla_{\mu_{1}}\dots\nabla_{\mu_... |
1805.00005 | Ahmadjon Abdujabbarov | Bobur Turimov, Bobomurat Ahmedov, Ahmadjon Abdujabbarov, Cosimo Bambi | Electromagnetic fields of slowly rotating magnetized compact stars in
conformal gravity | 9 pages, 7 figures, accepted for publication in Phys. Rev. D | Phys. Rev. D 97, 124005 (2018) | 10.1103/PhysRevD.97.124005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact analytical solutions for vacuum electromagnetic fields of slowly
rotating magnetized compact stars in conformal gravity have been studied.
Taking the realistic dipolar magnetic field configuration for the star,
analytical solutions of the Maxwell equations for the near zone magnetic and
the electric fields ... | [
{
"created": "Mon, 30 Apr 2018 01:55:12 GMT",
"version": "v1"
}
] | 2018-06-11 | [
[
"Turimov",
"Bobur",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Bambi",
"Cosimo",
""
]
] | The exact analytical solutions for vacuum electromagnetic fields of slowly rotating magnetized compact stars in conformal gravity have been studied. Taking the realistic dipolar magnetic field configuration for the star, analytical solutions of the Maxwell equations for the near zone magnetic and the electric fields ex... |
2309.02853 | Alexey Golovnev | Alexey Golovnev, A. N. Semenova, V.P. Vandeev | Gravitational Waves in New General Relativity | 14 pages; minor changes and additions | Journal of Cosmology and Astroparticle Physics JCAP01(2024)003 | 10.1088/1475-7516/2024/01/003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The models of New General Relativity have recently got attention of research
community, and there are some works studying their dynamical properties. The
formal aspects of this investigation have been mostly restricted to the primary
constraints in the Hamiltonian analysis. However, it is by far not enough for
counti... | [
{
"created": "Wed, 6 Sep 2023 09:30:06 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Nov 2023 15:26:43 GMT",
"version": "v2"
}
] | 2024-01-03 | [
[
"Golovnev",
"Alexey",
""
],
[
"Semenova",
"A. N.",
""
],
[
"Vandeev",
"V. P.",
""
]
] | The models of New General Relativity have recently got attention of research community, and there are some works studying their dynamical properties. The formal aspects of this investigation have been mostly restricted to the primary constraints in the Hamiltonian analysis. However, it is by far not enough for counting... |
2301.00319 | Rogerio Teixeira Cavalcanti | R. T. Cavalcanti and J. M. Hoff da Silva | Quantum Hairy Black Hole Formation and Horizon Quantum Mechanics | 10 pages, 5 figures | Universe 2023, 9(1), 23 | 10.3390/universe9010023 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | After introducing the gravitational decoupling method and the hairy black
hole recently derived from it, we investigate the formation of quantum hairy
black holes by applying the horizon quantum mechanics formalism. It enables us
to determine how external fields, characterized by hairy parameters, affect the
probabil... | [
{
"created": "Sun, 1 Jan 2023 01:33:04 GMT",
"version": "v1"
}
] | 2023-01-03 | [
[
"Cavalcanti",
"R. T.",
""
],
[
"da Silva",
"J. M. Hoff",
""
]
] | After introducing the gravitational decoupling method and the hairy black hole recently derived from it, we investigate the formation of quantum hairy black holes by applying the horizon quantum mechanics formalism. It enables us to determine how external fields, characterized by hairy parameters, affect the probabilit... |
gr-qc/9401008 | Domenico Seminara | P. Menotti and D. Seminara | Stationary Solutions in 2+1 Dimensional Gravity and Closed Time-Like
Curves | Talk presented at Europhysics Conference on High Energy Physics,
Marseille, France, July 22-28 1993, 5 pages, Latex, IFUP-49/93 | null | null | null | gr-qc | null | We apply the reduced radial gauge to give the general solution of the metric
in 2+1 dimensions in term of quadratures. It allows a complete controll on the
support of the source. We use the result to prove that for a general stationary
universe, conical at infinity, the weak energy condition and the absence of CTC
at... | [
{
"created": "Sat, 8 Jan 1994 11:32:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Menotti",
"P.",
""
],
[
"Seminara",
"D.",
""
]
] | We apply the reduced radial gauge to give the general solution of the metric in 2+1 dimensions in term of quadratures. It allows a complete controll on the support of the source. We use the result to prove that for a general stationary universe, conical at infinity, the weak energy condition and the absence of CTC at s... |
1709.06894 | Walberto Guzm\'an Ram\'irez | Walberto Guzm\'an Ram\'irez and Alexei A. Deriglazov | Relativistic effects due to gravimagnetic moment of a rotating body | 21 pages | Phys. Rev. D 96, 124013 (2017) | 10.1103/PhysRevD.96.124013 | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute exact Hamiltonian (and corresponding Dirac brackets) for spinning
particle with gravimagnetic moment $\kappa$ in an arbitrary gravitational
background. $\kappa=0$ corresponds to the Mathisson-Papapetrou-Tulczyjew-Dixon
(MPTD) equations. $\kappa=1$ leads to modified MPTD equations with reasonable
behavior i... | [
{
"created": "Tue, 19 Sep 2017 16:36:32 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2017 16:50:37 GMT",
"version": "v2"
}
] | 2017-12-20 | [
[
"Ramírez",
"Walberto Guzmán",
""
],
[
"Deriglazov",
"Alexei A.",
""
]
] | We compute exact Hamiltonian (and corresponding Dirac brackets) for spinning particle with gravimagnetic moment $\kappa$ in an arbitrary gravitational background. $\kappa=0$ corresponds to the Mathisson-Papapetrou-Tulczyjew-Dixon (MPTD) equations. $\kappa=1$ leads to modified MPTD equations with reasonable behavior in ... |
2402.02221 | Lamine Khodja | Houssam Eddine Trad and Lamine Khodja | New treatment of red/blue shifts of emitted photons in terms of
Kerr-Newman black hole parameters | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | This study presents a method for determining the mass, angular momentum, and
charge of Kerr-Newman black holes by analyzing the red/blue shifts of photons
emitted by geodesic neutral massive objects. We derive the equations of motion
for photons in the Kerr-Newman spacetime. We obtain explicit expressions for
redshif... | [
{
"created": "Sat, 3 Feb 2024 17:30:52 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2024 14:03:15 GMT",
"version": "v2"
}
] | 2024-04-08 | [
[
"Trad",
"Houssam Eddine",
""
],
[
"Khodja",
"Lamine",
""
]
] | This study presents a method for determining the mass, angular momentum, and charge of Kerr-Newman black holes by analyzing the red/blue shifts of photons emitted by geodesic neutral massive objects. We derive the equations of motion for photons in the Kerr-Newman spacetime. We obtain explicit expressions for redshift/... |
2006.14258 | Matt Visser | Joshua Baines, Thomas Berry, Alex Simpson, and Matt Visser (Victoria
University of Wellington) | Painleve-Gullstrand form of the Lense-Thirring spacetime | V1:19 pages. V2: now 30 pages. Significant additions: We now discuss
tetrads, orthonormal components, eigenvalues of the Weyl tensor, the Petrov
classification, ISCOs and circular photon orbits. Many small changes for
clarity. Two references updated, and one reference added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard Lense-Thirring metric is a century-old slow-rotation
large-distance approximation to the gravitational field outside a rotating
massive body, depending only on the total mass and angular momentum of the
source. Although it is not an exact solution to the vacuum Einstein equations,
asymptotically the Lens... | [
{
"created": "Thu, 25 Jun 2020 09:04:11 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2020 06:14:37 GMT",
"version": "v2"
}
] | 2020-10-30 | [
[
"Baines",
"Joshua",
"",
"Victoria\n University of Wellington"
],
[
"Berry",
"Thomas",
"",
"Victoria\n University of Wellington"
],
[
"Simpson",
"Alex",
"",
"Victoria\n University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria\n U... | The standard Lense-Thirring metric is a century-old slow-rotation large-distance approximation to the gravitational field outside a rotating massive body, depending only on the total mass and angular momentum of the source. Although it is not an exact solution to the vacuum Einstein equations, asymptotically the Lense-... |
1711.11380 | Jan Sbierski | Jan Sbierski | On the proof of the $C^0$-inextendibility of the Schwarzschild spacetime | Prepared for submission to the proceedings of the meeting
"Non-Regular Spacetime Geometry", Florence, 20.6.-22.6.2017. Based on
arXiv:1507.00601, v2: minor changes, version accepted for publication | null | 10.1088/1742-6596/968/1/012012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article presents a streamlined version of the author's original proof of
the $C^0$-inextendibility of the maximal analytic Schwarzschild spacetime.
Firstly, we deviate from the original proof by using the result, recently
established in collaboration with Galloway and Ling, that given a
$C^0$-extension of a glob... | [
{
"created": "Thu, 30 Nov 2017 13:28:09 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jan 2018 09:47:41 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Sbierski",
"Jan",
""
]
] | This article presents a streamlined version of the author's original proof of the $C^0$-inextendibility of the maximal analytic Schwarzschild spacetime. Firstly, we deviate from the original proof by using the result, recently established in collaboration with Galloway and Ling, that given a $C^0$-extension of a global... |
1002.3836 | Mercedes Velazquez | Merced Montesinos, Mercedes Velazquez | BF gravity with Immirzi parameter and cosmological constant | 4 pages, no figures, LaTeX file | Phys.Rev.D81:044033,2010 | 10.1103/PhysRevD.81.044033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The action principle of the BF type introduced by Capovilla, Montesinos,
Prieto, and Rojas (CMPR) which describes general relativity with Immirzi
parameter is modified in order to allow the inclusion of the cosmological
constant. The resulting action principle is on the same footing as the original
Plebanski action i... | [
{
"created": "Fri, 19 Feb 2010 22:47:24 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Montesinos",
"Merced",
""
],
[
"Velazquez",
"Mercedes",
""
]
] | The action principle of the BF type introduced by Capovilla, Montesinos, Prieto, and Rojas (CMPR) which describes general relativity with Immirzi parameter is modified in order to allow the inclusion of the cosmological constant. The resulting action principle is on the same footing as the original Plebanski action in ... |
2304.02027 | Diogo Bragan\c{c}a | Diogo P. L. Bragan\c{c}a | A viable relativistic scalar theory of gravitation | 15 pages, 4 figures. Accepted for publication in Classical and
Quantum Gravity | null | 10.1088/1361-6382/acd0ff | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We build a self-consistent relativistic scalar theory of gravitation on a
flat Minkowski spacetime from a general field Lagrangian. It is shown that, for
parameters that satisfy the Equivalence Principle, this theory predicts the
same outcome as general relativity for every classical solar-system test. This
theory al... | [
{
"created": "Tue, 4 Apr 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-05-15 | [
[
"Bragança",
"Diogo P. L.",
""
]
] | We build a self-consistent relativistic scalar theory of gravitation on a flat Minkowski spacetime from a general field Lagrangian. It is shown that, for parameters that satisfy the Equivalence Principle, this theory predicts the same outcome as general relativity for every classical solar-system test. This theory also... |
1204.0054 | Yuri Bonder | Yuri Bonder | Quantum particles and an effective spacetime geometry | Presented at the IX Workshop of the Mexican Gravity Division | null | 10.1063/1.4748551 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spacetime geometry is supposed to be measured by identifying the trajectories
of free test particles with geodesics. In practice, this cannot be done
because, being described by Quantum Mechanics, particles do not follow
trajectories. As a first step to study how it is possible to read spacetime
geometry with quantum... | [
{
"created": "Sat, 31 Mar 2012 01:10:21 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Bonder",
"Yuri",
""
]
] | Spacetime geometry is supposed to be measured by identifying the trajectories of free test particles with geodesics. In practice, this cannot be done because, being described by Quantum Mechanics, particles do not follow trajectories. As a first step to study how it is possible to read spacetime geometry with quantum p... |
1905.00012 | Nils Andersson | N. Andersson and P. Pnigouras | The phenomenology of dynamical neutron star tides | Revised version with added details. To appear in MNRAS | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a phenomenological, physically motivated, model for the
effective tidal deformability of a neutron star, adding the frequency
dependence (associated with the star's fundamental mode of oscillation) that
comes into play during the late stages of the binary inspiral. Testing the
model against alternative d... | [
{
"created": "Tue, 30 Apr 2019 17:40:37 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2019 06:50:48 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Feb 2021 15:40:28 GMT",
"version": "v3"
}
] | 2021-02-09 | [
[
"Andersson",
"N.",
""
],
[
"Pnigouras",
"P.",
""
]
] | We introduce a phenomenological, physically motivated, model for the effective tidal deformability of a neutron star, adding the frequency dependence (associated with the star's fundamental mode of oscillation) that comes into play during the late stages of the binary inspiral. Testing the model against alternative des... |
gr-qc/9909084 | Lee Lindblom | Lee Lindblom and Gregory Mendell | R-Modes in Superfluid Neutron Stars | 15 pages, 8 figures | Phys.Rev. D61 (2000) 104003 | 10.1103/PhysRevD.61.104003 | null | gr-qc astro-ph | null | The analogs of r-modes in superfluid neutron stars are studied here. These
modes, which are governed primarily by the Coriolis force, are identical to
their ordinary-fluid counterparts at the lowest order in the small
angular-velocity expansion used here. The equations that determine the next
order terms are derived ... | [
{
"created": "Mon, 27 Sep 1999 19:12:20 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lindblom",
"Lee",
""
],
[
"Mendell",
"Gregory",
""
]
] | The analogs of r-modes in superfluid neutron stars are studied here. These modes, which are governed primarily by the Coriolis force, are identical to their ordinary-fluid counterparts at the lowest order in the small angular-velocity expansion used here. The equations that determine the next order terms are derived an... |
gr-qc/9304032 | Henri Waelbrock | Jemal Guven | Covariant perturbations of domain walls in curved spacetime | 15 pages,ICN-UNAM-93-01 | Phys.Rev. D48 (1993) 4604-4608 | 10.1103/PhysRevD.48.4604 | null | gr-qc | null | A manifestly covariant equation is derived to describe the perturbations in a
domain wall on a given background spacetime. This generalizes recent work on
domain walls in Minkowski space and introduces a framework for examining the
stability of relativistic bubbles in curved spacetimes.
| [
{
"created": "Wed, 21 Apr 1993 21:20:04 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Guven",
"Jemal",
""
]
] | A manifestly covariant equation is derived to describe the perturbations in a domain wall on a given background spacetime. This generalizes recent work on domain walls in Minkowski space and introduces a framework for examining the stability of relativistic bubbles in curved spacetimes. |
0710.4919 | Martin Bojowald | Martin Bojowald | Harmonic cosmology: How much can we know about a universe before the big
bang? | 16 pages | Proc.Roy.Soc.Lond.A464:2135-2150,2008 | 10.1098/rspa.2008.0050 | null | gr-qc astro-ph hep-th | null | Quantum gravity may remove classical space-time singularities and thus reveal
what a universe at and before the big bang could be like. In loop quantum
cosmology, an exactly solvable model is available which allows one to address
precise dynamical coherent states and their evolution in such a setting. It is
shown her... | [
{
"created": "Thu, 25 Oct 2007 18:40:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bojowald",
"Martin",
""
]
] | Quantum gravity may remove classical space-time singularities and thus reveal what a universe at and before the big bang could be like. In loop quantum cosmology, an exactly solvable model is available which allows one to address precise dynamical coherent states and their evolution in such a setting. It is shown here ... |
2111.08682 | Haidar Sheikhahmadi | Haidar Sheikhahmadi | Schwarzschild black hole perturbed by a force-free magnetic field | 12 Pages; Based on published version | Foundations of Physics 52, 93 (2022) | 10.1007/s10701-022-00612-7 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We envisage a black hole perturbed by a force-free magnetic field (FFMF)
outside and attempt to determine its structure. We suppose the metric that
describes this black hole is of the static spherical type, that is
Schwarzschild, and the energy-momentum tensor emanating from an FFMF source
perturbs this background me... | [
{
"created": "Tue, 16 Nov 2021 18:35:01 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2022 07:26:38 GMT",
"version": "v2"
}
] | 2022-11-03 | [
[
"Sheikhahmadi",
"Haidar",
""
]
] | We envisage a black hole perturbed by a force-free magnetic field (FFMF) outside and attempt to determine its structure. We suppose the metric that describes this black hole is of the static spherical type, that is Schwarzschild, and the energy-momentum tensor emanating from an FFMF source perturbs this background metr... |
1803.03203 | Denis Dobkowski-Ry{\l}ko | Denis Dobkowski-Ry{\l}ko, Jerzy Lewandowski and Tomasz Paw{\l}owski | The Petrov type D isolated null surfaces | RevTex4, BibTex, 29 pages | null | 10.1088/1361-6382/aad209 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generic black holes in vacuum-de Sitter / Anti-de Sitter spacetimes are
studied in quasi-local framework, where the relevant properties are captured in
the intrinsic geometry of the null surface (the horizon). Imposing the
quasi-local notion of stationarity (null symmetry of the metric up to second
order at the horiz... | [
{
"created": "Thu, 8 Mar 2018 17:08:19 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2018 10:42:06 GMT",
"version": "v2"
}
] | 2018-08-08 | [
[
"Dobkowski-Ryłko",
"Denis",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Pawłowski",
"Tomasz",
""
]
] | Generic black holes in vacuum-de Sitter / Anti-de Sitter spacetimes are studied in quasi-local framework, where the relevant properties are captured in the intrinsic geometry of the null surface (the horizon). Imposing the quasi-local notion of stationarity (null symmetry of the metric up to second order at the horizon... |
1106.4911 | Jorge A. Rueda | M. Rotondo, Jorge A. Rueda, R. Ruffini, S.-S. Xue | The self-consistent general relativistic solution for a system of
degenerate neutrons, protons and electrons in beta-equilibrium | Letter in press, Physics Letters B (2011) | Physics Letters B, Volume 701, Issue 5, p. 667-671 (2011) | 10.1016/j.physletb.2011.06.041 | null | gr-qc astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the self-consistent treatment of the simplest, nontrivial,
self-gravitating system of degenerate neutrons, protons and electrons in
$\beta$-equilibrium within relativistic quantum statistics and the
Einstein-Maxwell equations. The impossibility of imposing the condition of
local charge neutrality on such s... | [
{
"created": "Fri, 24 Jun 2011 08:54:15 GMT",
"version": "v1"
}
] | 2011-09-14 | [
[
"Rotondo",
"M.",
""
],
[
"Rueda",
"Jorge A.",
""
],
[
"Ruffini",
"R.",
""
],
[
"Xue",
"S. -S.",
""
]
] | We present the self-consistent treatment of the simplest, nontrivial, self-gravitating system of degenerate neutrons, protons and electrons in $\beta$-equilibrium within relativistic quantum statistics and the Einstein-Maxwell equations. The impossibility of imposing the condition of local charge neutrality on such sys... |
1609.04013 | Ivica Smoli\'c | Ivica Smoli\'c | Constraints on the symmetry noninheriting scalar black hole hair | 10 pages | Phys. Rev. D 95, 024016 (2017) | 10.1103/PhysRevD.95.024016 | ZTF-EP-16-04 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Any recipe to grow black hole hair has to circumvent no-hair theorems by
violating some of their assumptions. Recently discovered hairy black hole
solutions exist due to the fact that their scalar fields don't inherit the
symmetries of the spacetime metric. We present here a general analysis of the
constraints which ... | [
{
"created": "Tue, 13 Sep 2016 20:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2017 19:00:05 GMT",
"version": "v2"
}
] | 2017-01-18 | [
[
"Smolić",
"Ivica",
""
]
] | Any recipe to grow black hole hair has to circumvent no-hair theorems by violating some of their assumptions. Recently discovered hairy black hole solutions exist due to the fact that their scalar fields don't inherit the symmetries of the spacetime metric. We present here a general analysis of the constraints which li... |
2105.06410 | Paolo Pani | Elisa Maggio, Paolo Pani, Guilherme Raposo | Testing the nature of dark compact objects with gravitational waves | 27 pages + references; 10 figures. Invited chapter for "Handbook of
Gravitational Wave Astronomy" (Eds. C. Bambi, S. Katsanevas and K. Kokkotas;
Springer Singapore, 2021) | null | 10.1007/978-981-15-4702-7_29-1 | null | gr-qc astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | Within Einstein's theory of gravity, any compact object heavier than a few
solar masses must be a black hole. Any observation showing otherwise would
imply either new physics beyond General Relativity or new exotic matter fields
beyond the Standard Model, and might provide a portal to understand some
puzzling propert... | [
{
"created": "Thu, 13 May 2021 16:32:51 GMT",
"version": "v1"
}
] | 2022-07-20 | [
[
"Maggio",
"Elisa",
""
],
[
"Pani",
"Paolo",
""
],
[
"Raposo",
"Guilherme",
""
]
] | Within Einstein's theory of gravity, any compact object heavier than a few solar masses must be a black hole. Any observation showing otherwise would imply either new physics beyond General Relativity or new exotic matter fields beyond the Standard Model, and might provide a portal to understand some puzzling propertie... |
gr-qc/0703126 | Timothy Clifton | Timothy Clifton | Exact Friedmann Solutions in Higher-Order Gravity Theories | 24 pages, 6 figures | Class.Quant.Grav.24:5073-5091,2007 | 10.1088/0264-9381/24/20/010 | null | gr-qc astro-ph hep-th | null | We find the general behaviour of homogeneous and isotropic cosmological
models in some fourth-order theories of gravity. Explicit, exact, general
solutions are given for both empty universes and those filled with a perfect
fluid. For the vacuum case, solutions are found with closed, open and flat
geometries, whilst t... | [
{
"created": "Mon, 26 Mar 2007 19:46:30 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Aug 2007 20:01:46 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Clifton",
"Timothy",
""
]
] | We find the general behaviour of homogeneous and isotropic cosmological models in some fourth-order theories of gravity. Explicit, exact, general solutions are given for both empty universes and those filled with a perfect fluid. For the vacuum case, solutions are found with closed, open and flat geometries, whilst the... |
1001.5147 | Abhay Ashtekar | Abhay Ashtekar, Miguel Campiglia, Adam Henderson | Casting Loop Quantum Cosmology in the Spin Foam Paradigm | 37 pages, no figures. 3 references and half a dozen clarifications
added. All changes are minor. | Class.Quant.Grav.27:135020,2010 | 10.1088/0264-9381/27/13/135020 | IGC-10/1-1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of spin foam models is to provide a viable path integral formulation
of quantum gravity. Because of background independence, their underlying
framework has certain novel features that are not shared by path integral
formulations of familiar field theories in Minkowski space. As a simple
viability test, these... | [
{
"created": "Thu, 28 Jan 2010 17:16:39 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Apr 2010 02:11:35 GMT",
"version": "v2"
}
] | 2011-01-25 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Campiglia",
"Miguel",
""
],
[
"Henderson",
"Adam",
""
]
] | The goal of spin foam models is to provide a viable path integral formulation of quantum gravity. Because of background independence, their underlying framework has certain novel features that are not shared by path integral formulations of familiar field theories in Minkowski space. As a simple viability test, these f... |
2009.12839 | Daniele Malafarina | Daniele Malafarina and Sabina Sagynbayeva | What a difference a quadrupole makes? | 12 pages, 7 figures, published version | General Relativity and Gravitation, (2021) 53:11 | 10.1007/s10714-021-02881-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider some implications of the departure from spherical symmetry for
static solutions of the vacuum Einstein's equations describing black hole
mimickers. In particular, we investigate how the presence of mass quadrupole
moment affects the collision energy of test particles. We show that collision
processes in t... | [
{
"created": "Sun, 27 Sep 2020 13:20:05 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Dec 2021 05:12:38 GMT",
"version": "v2"
}
] | 2021-12-14 | [
[
"Malafarina",
"Daniele",
""
],
[
"Sagynbayeva",
"Sabina",
""
]
] | We consider some implications of the departure from spherical symmetry for static solutions of the vacuum Einstein's equations describing black hole mimickers. In particular, we investigate how the presence of mass quadrupole moment affects the collision energy of test particles. We show that collision processes in the... |
gr-qc/0211067 | Gerold Betschart | Mattias Marklund, Peter K. S. Dunsby, Gerold Betschart, Martin Servin
and Christos Tsagas | Charged multifluids in general relativity | 14 pages (example added), to appear in Class. Quantum Grav | Class.Quant.Grav. 20 (2003) 1823-1834 | 10.1088/0264-9381/20/9/315 | null | gr-qc | null | The exact 1+3 covariant dynamical fluid equations for a multi-component
plasma, together with Maxwell's equations are presented in such a way as to
make them suitable for a gauge-invariant analysis of linear density and
velocity perturbations of the Friedmann-Robertson-Walker model. In the case
where the matter is de... | [
{
"created": "Wed, 20 Nov 2002 14:03:43 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2003 12:38:32 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Marklund",
"Mattias",
""
],
[
"Dunsby",
"Peter K. S.",
""
],
[
"Betschart",
"Gerold",
""
],
[
"Servin",
"Martin",
""
],
[
"Tsagas",
"Christos",
""
]
] | The exact 1+3 covariant dynamical fluid equations for a multi-component plasma, together with Maxwell's equations are presented in such a way as to make them suitable for a gauge-invariant analysis of linear density and velocity perturbations of the Friedmann-Robertson-Walker model. In the case where the matter is desc... |
2404.09278 | Yen Chin Ong | Jiayi Xia, Yen Chin Ong | Upper Bound of Barrow Entropy Index from Black Hole Fragmentation | 3 pages; invited contribution | Universe 2024, 10(4), 177 | 10.3390/universe10040177 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both classical and quantum arguments suggest that if Barrow entropy is
correct, its index $\delta$ must be energy dependent, which would affect the
very early universe. Based on thermodynamic stability that sufficiently large
black holes should not fragment, we argue that Barrow entropy correction must
be small excep... | [
{
"created": "Sun, 14 Apr 2024 15:01:34 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Xia",
"Jiayi",
""
],
[
"Ong",
"Yen Chin",
""
]
] | Both classical and quantum arguments suggest that if Barrow entropy is correct, its index $\delta$ must be energy dependent, which would affect the very early universe. Based on thermodynamic stability that sufficiently large black holes should not fragment, we argue that Barrow entropy correction must be small except ... |
1405.1977 | Savelova Elena P. Dr. | E.P. Savelova | On possible origin of an anisotropy in the speed of light in vacuum | arXiv admin note: text overlap with arXiv:1204.0351 | GRG (2016) 48:85 | 10.1007/s10714-016-2079-5 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We assume the spacetime foam picture in which vacuum is filled with virtual
wormholes. In the presence of an external field the distribution of wormholes
changes. We consider an anisotropic distribution of wormholes and analyze its
relation to the speed of light. We show that speed of light acquires an
anisotropic ch... | [
{
"created": "Thu, 8 May 2014 15:41:35 GMT",
"version": "v1"
}
] | 2016-06-14 | [
[
"Savelova",
"E. P.",
""
]
] | We assume the spacetime foam picture in which vacuum is filled with virtual wormholes. In the presence of an external field the distribution of wormholes changes. We consider an anisotropic distribution of wormholes and analyze its relation to the speed of light. We show that speed of light acquires an anisotropic char... |
2206.07616 | Bo-Qiang Ma | Jie Zhu, Bo-Qiang Ma | Lorentz-violation-induced arrival time delay of astroparticles in
Finsler spacetime | 7 latex pages, no figure, final version for journal publication | Phys.Rev.D 105 (2022) 124069 | 10.1103/PhysRevD.105.124069 | null | gr-qc astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Finsler geometry is a natural and fundamental generalization of Riemann
geometry. The Finsler structure depends on both coordinates and velocities. We
present the arrival time delay of astroparticles subject to Lorentz violation
in the framework of Finsler geometry, and the result corresponds to that
derived by Jacob... | [
{
"created": "Wed, 15 Jun 2022 15:59:01 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jun 2022 17:11:17 GMT",
"version": "v2"
}
] | 2022-06-28 | [
[
"Zhu",
"Jie",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | Finsler geometry is a natural and fundamental generalization of Riemann geometry. The Finsler structure depends on both coordinates and velocities. We present the arrival time delay of astroparticles subject to Lorentz violation in the framework of Finsler geometry, and the result corresponds to that derived by Jacob a... |
2005.06817 | Baocheng Zhang | Feifan He and Baocheng Zhang | A protocol of potential advantage in the low frequency range to
gravitational wave detection with space based optical atomic clocks | null | Eur. Phys. J. D (2020) 74: 94 | 10.1140/epjd/e2020-100611-y | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent proposal describes space based gravitational wave (GW) detection
with optical lattice atomic clocks [Kolkowitz et. al., Phys. Rev. D 94, 124043
(2016)] [1]. Based on their setup, we propose a new measurement method for
gravitational wave detection in low frequency with optical lattice atomic
clocks. In our m... | [
{
"created": "Thu, 14 May 2020 08:56:58 GMT",
"version": "v1"
}
] | 2020-05-15 | [
[
"He",
"Feifan",
""
],
[
"Zhang",
"Baocheng",
""
]
] | A recent proposal describes space based gravitational wave (GW) detection with optical lattice atomic clocks [Kolkowitz et. al., Phys. Rev. D 94, 124043 (2016)] [1]. Based on their setup, we propose a new measurement method for gravitational wave detection in low frequency with optical lattice atomic clocks. In our met... |
gr-qc/9411002 | Eric Poisson | Dragoljub Markovic and Eric Poisson | Classical stability and quantum instability of black-hole Cauchy
horizons | 4 pages; uses ReVTeX; figure available upon request to
poisson@wurel.wustl.edu | Phys.Rev.Lett. 74 (1995) 1280-1283 | 10.1103/PhysRevLett.74.1280 | null | gr-qc | null | For a certain region of the parameter space $\{M,e,\Lambda\}$, the Cauchy
horizon of a (charged) black hole residing in de Sitter space is classically
stable to gravitational perturbations. This implies that, when left to its own
devices, classical theory is unable to retain full predictive power: the
evolution of ph... | [
{
"created": "Tue, 1 Nov 1994 18:09:25 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Markovic",
"Dragoljub",
""
],
[
"Poisson",
"Eric",
""
]
] | For a certain region of the parameter space $\{M,e,\Lambda\}$, the Cauchy horizon of a (charged) black hole residing in de Sitter space is classically stable to gravitational perturbations. This implies that, when left to its own devices, classical theory is unable to retain full predictive power: the evolution of phys... |
1301.5977 | Ali Alavi | S. A. Alavi, S. Nodeh | Neutrino spin oscillations in gravitational fields in non-commutative
Spaces | 17pages, 3 figures, replaced with the version accepted for
publication in Physica Scripta | Phys. Scr. 90 (2015) 035301 | 10.1088/0031-8949/90/3/035301 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study neutrino spin oscillations in gravitational fields in
non-commutative spaces. For the Schwarzschild metric the maximum frequency
decreases with increasing the noncommutativity parameter. In the case of
Reissner-Nordstrom (RN) metric, the maximum frequency of oscillation is a
monotonically increasing function... | [
{
"created": "Fri, 25 Jan 2013 07:59:52 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2013 22:01:19 GMT",
"version": "v2"
},
{
"created": "Mon, 19 May 2014 11:03:19 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Dec 2014 13:00:26 GMT",
"version": "v4"
}
] | 2015-03-19 | [
[
"Alavi",
"S. A.",
""
],
[
"Nodeh",
"S.",
""
]
] | We study neutrino spin oscillations in gravitational fields in non-commutative spaces. For the Schwarzschild metric the maximum frequency decreases with increasing the noncommutativity parameter. In the case of Reissner-Nordstrom (RN) metric, the maximum frequency of oscillation is a monotonically increasing function o... |
2302.06636 | Dejan Gajic | Dejan Gajic | Azimuthal instabilities on extremal Kerr | Version submitted for publication | null | null | null | gr-qc math.AP | http://creativecommons.org/licenses/by/4.0/ | We prove the existence of instabilities for the geometric linear wave
equation on extremal Kerr spacetime backgrounds, which describe stationary
black holes rotating at their maximally allowed angular velocity. These
instabilities can be associated to non-axisymmetric azimuthal modes and are
stronger than the axisymm... | [
{
"created": "Mon, 13 Feb 2023 19:00:08 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2023 10:08:10 GMT",
"version": "v2"
}
] | 2023-04-18 | [
[
"Gajic",
"Dejan",
""
]
] | We prove the existence of instabilities for the geometric linear wave equation on extremal Kerr spacetime backgrounds, which describe stationary black holes rotating at their maximally allowed angular velocity. These instabilities can be associated to non-axisymmetric azimuthal modes and are stronger than the axisymmet... |
2207.07905 | Valerio Faraoni | Shin'ichi Nojiri, Sergei D. Odintsov, Valerio Faraoni | Alternative entropies and consistent black hole thermodynamics | 20 pages, LateX, to appear in Int. J. Geom. Meth. Mod. Phys | null | 10.1142/S0219887822502103 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While the Bekenstein-Hawking entropy is the unique notion of entropy that
makes classical black hole thermodynamics consistent, alternative entropy
notions (R\'enyi, Tsallis, and generalized constructs) abound in the
literature. We explore conditions under which they are part of a consistent
horizon thermodynamics fo... | [
{
"created": "Sat, 16 Jul 2022 11:24:12 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Faraoni",
"Valerio",
""
]
] | While the Bekenstein-Hawking entropy is the unique notion of entropy that makes classical black hole thermodynamics consistent, alternative entropy notions (R\'enyi, Tsallis, and generalized constructs) abound in the literature. We explore conditions under which they are part of a consistent horizon thermodynamics for ... |
1303.2109 | Muhammad Sharif | M. Sharif and Saira Waheed | Cosmic Acceleration and Brans-Dicke Theory | 29 pages, 13 figures | J. Exp. Theor. Phys. 115(2012)599-613 | 10.1134/S1063776112080158 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to study the accelerated expansion of the universe by
exploring the Brans-Dicke parameter in different eras. For this purpose, we
take FRW universe model with viscous fluid (without potential) and Bianchi type
I universe model with barotropic fluid (with and without potential). We
evaluate decel... | [
{
"created": "Fri, 8 Mar 2013 02:45:26 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Sharif",
"M.",
""
],
[
"Waheed",
"Saira",
""
]
] | This paper is devoted to study the accelerated expansion of the universe by exploring the Brans-Dicke parameter in different eras. For this purpose, we take FRW universe model with viscous fluid (without potential) and Bianchi type I universe model with barotropic fluid (with and without potential). We evaluate deceler... |
1801.02555 | Ali \"Ovg\"un Dr. | Ali \"Ovg\"un, Kimet Jusufi | Quasinormal Modes and Greybody Factors of $f(R)$ gravity minimally
coupled to a cloud of strings in $2+1$ Dimensions | 9 pages, 3 figures, twocolumn. Accepted for publication in Annals of
Physics | Annals of Physics 395, 138-151 (2018) | 10.1016/j.aop.2018.05.013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have studied the propagation of a massless scalar field
minimally coupled to a black hole with the source of cloud of strings in $2+1$
$f(R)$gravity theory. In particular we have found analytical results for the
decay rate, reflection coefficient, greybody factors, as well as the black hole
temperatu... | [
{
"created": "Mon, 8 Jan 2018 16:57:55 GMT",
"version": "v1"
},
{
"created": "Mon, 28 May 2018 01:53:30 GMT",
"version": "v2"
}
] | 2018-06-28 | [
[
"Övgün",
"Ali",
""
],
[
"Jusufi",
"Kimet",
""
]
] | In this paper we have studied the propagation of a massless scalar field minimally coupled to a black hole with the source of cloud of strings in $2+1$ $f(R)$gravity theory. In particular we have found analytical results for the decay rate, reflection coefficient, greybody factors, as well as the black hole temperature... |
1403.3356 | Maurice Dupre | Maurice J. Dupre | The structure of local gravity theories | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the structure of local gravity theories as resulting from the idea
that locally gravity must be physically characterized by tidal acceleration,
and show how this relates to both Newtonian gravity and Einstein's general
relativity.
| [
{
"created": "Wed, 12 Mar 2014 01:50:04 GMT",
"version": "v1"
}
] | 2014-03-14 | [
[
"Dupre",
"Maurice J.",
""
]
] | We discuss the structure of local gravity theories as resulting from the idea that locally gravity must be physically characterized by tidal acceleration, and show how this relates to both Newtonian gravity and Einstein's general relativity. |
2401.08758 | Lidia J. Gomes Da Silva Miss | Lidia J. Gomes Da Silva | DiscoTEX: Discontinuous collocation and implicit-turned-explicit (IMTEX)
integration symplectic, symmetric numerical algorithms with higher order
jumps for differential equations with numerical black hole perturbation
theory applications | 44 pages, 17 figures, 8 tables. Includes overview of previous
numerical methods implemented in the time-domain for the modelling of
Extreme-Mass-Ratio-Inspirals with suitability checks on Table 8. Comments are
welcome | null | null | null | gr-qc astro-ph.HE cs.NA math.NA physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dirac delta distributionally sourced differential equations emerge in many
dynamical physical systems from neuroscience to black hole perturbation theory.
Most of these lack exact analytical solutions and are thus best tackled
numerically. This work describes a generic numerical algorithm which constructs
discontinuo... | [
{
"created": "Tue, 16 Jan 2024 19:00:02 GMT",
"version": "v1"
}
] | 2024-01-18 | [
[
"Da Silva",
"Lidia J. Gomes",
""
]
] | Dirac delta distributionally sourced differential equations emerge in many dynamical physical systems from neuroscience to black hole perturbation theory. Most of these lack exact analytical solutions and are thus best tackled numerically. This work describes a generic numerical algorithm which constructs discontinuous... |
1711.01935 | Yeinzon Rodriguez Garcia | Yeinzon Rodriguez (1,2,3), Andres A. Navarro (2,4) ((1) Universidad
Antonio Narino, (2) Universidad Industrial de Santander, (3) The Abdus Salam
International Centre for Theoretical Physics, (4) Universidad Santo Tomas) | Non-Abelian $S$-term dark energy and inflation | LaTeX file in RevTeX 4.1 style, 8 pages, 20 figures. v2: several
changes here and there to improve the overall presentation of the paper.
Primordial inflation section clarified. The viability of the model after the
detection of the gravitational wave signal GW170817 and its electromagnetic
counterpart GRB 17081... | Phys.Dark Univ. 19: 129-136, 2018 | 10.1016/j.dark.2018.01.003 | PI/UAN-2017-615FT | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the role that a cosmic triad in the generalized $SU(2)$ Proca
theory, specifically in one of the pieces of the Lagrangian that involves the
symmetric version $S_{\mu \nu}$ of the gauge field strength tensor $F_{\mu
\nu}$, has on dark energy and primordial inflation. Regarding dark energy, the
triad behaves a... | [
{
"created": "Fri, 3 Nov 2017 17:43:53 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2017 16:39:44 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jan 2018 13:17:43 GMT",
"version": "v3"
},
{
"created": "Tue, 20 Feb 2018 16:46:48 GMT",
"version": "v4"
}
] | 2018-02-21 | [
[
"Rodriguez",
"Yeinzon",
""
],
[
"Navarro",
"Andres A.",
""
]
] | We study the role that a cosmic triad in the generalized $SU(2)$ Proca theory, specifically in one of the pieces of the Lagrangian that involves the symmetric version $S_{\mu \nu}$ of the gauge field strength tensor $F_{\mu \nu}$, has on dark energy and primordial inflation. Regarding dark energy, the triad behaves asy... |
2006.10561 | Ranjan Sharma | Ranjan Sharma, Naresh Dadhich, Shyam Das and Sunil D. Maharaj | An electromagnetic extension of the Schwarzschild interior solution and
the corresponding Buchdahl limit | 12 pages, 8 figures | null | 10.1140/epjc/s10052-021-08894-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We wish to construct a model for charged star as a generalization of the
uniform density Schwarzschild interior solution. We employ the Vaidya and
Tikekar ansatz [{\it Astrophys. Astron.} {\bf 3} (1982) 325] for one of the
metric potentials and electric field is chosen in such a way that when it is
switched off the m... | [
{
"created": "Tue, 16 Jun 2020 18:45:13 GMT",
"version": "v1"
}
] | 2021-02-24 | [
[
"Sharma",
"Ranjan",
""
],
[
"Dadhich",
"Naresh",
""
],
[
"Das",
"Shyam",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | We wish to construct a model for charged star as a generalization of the uniform density Schwarzschild interior solution. We employ the Vaidya and Tikekar ansatz [{\it Astrophys. Astron.} {\bf 3} (1982) 325] for one of the metric potentials and electric field is chosen in such a way that when it is switched off the met... |
gr-qc/9805024 | CJ Fewster | C.J. Fewster and S.P. Eveson (Department of Mathematics, University of
York) | Bounds on negative energy densities in flat spacetime | REVTeX, 13 pages and 2 figures. Minor typos corrected, one reference
added | Phys.Rev.D58:084010,1998 | 10.1103/PhysRevD.58.084010 | null | gr-qc hep-th | null | We generalise results of Ford and Roman which place lower bounds -- known as
quantum inequalities -- on the renormalised energy density of a quantum field
averaged against a choice of sampling function. Ford and Roman derived their
results for a specific non-compactly supported sampling function; here we use a
differ... | [
{
"created": "Thu, 7 May 1998 17:28:57 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jul 1998 14:52:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fewster",
"C. J.",
"",
"Department of Mathematics, University of\n York"
],
[
"Eveson",
"S. P.",
"",
"Department of Mathematics, University of\n York"
]
] | We generalise results of Ford and Roman which place lower bounds -- known as quantum inequalities -- on the renormalised energy density of a quantum field averaged against a choice of sampling function. Ford and Roman derived their results for a specific non-compactly supported sampling function; here we use a differen... |
gr-qc/0402053 | Martin Bojowald | Martin Bojowald | Loop Quantum Cosmology: Recent Progress | 17 pages, 2 figures, Plenary talk at ICGC 04, Cochin, India | Pramana 63:765-776,2004 | 10.1007/BF02705198 | AEI-2004-017 | gr-qc | null | Aspects of the full theory of loop quantum gravity can be studied in a
simpler context by reducing to symmetric models like cosmological ones. This
leads to several applications where loop effects play a significant role when
one is sensitive to the quantum regime. As a consequence, the structure of and
the approach ... | [
{
"created": "Thu, 12 Feb 2004 10:13:47 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Bojowald",
"Martin",
""
]
] | Aspects of the full theory of loop quantum gravity can be studied in a simpler context by reducing to symmetric models like cosmological ones. This leads to several applications where loop effects play a significant role when one is sensitive to the quantum regime. As a consequence, the structure of and the approach to... |
2311.04672 | Parthapratim Mahapatra | Parthapratim Mahapatra and Shilpa Kastha | Parametrized multipolar gravitational waveform for testing general
relativity: Amplitude corrections upto 2PN order | 15 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A parametrized multipolar gravitational wave phasing within multipolar
post-Minkowskian and post-Newtonian formalism was developed in earlier works
[S. Kastha et al., PRD 98, 124033 (2018) & S. Kastha et al., PRD 100, 044007
(2019)]. This facilitates the model-agnostic tests for the multipolar structure
of compact bi... | [
{
"created": "Wed, 8 Nov 2023 13:27:23 GMT",
"version": "v1"
}
] | 2023-11-09 | [
[
"Mahapatra",
"Parthapratim",
""
],
[
"Kastha",
"Shilpa",
""
]
] | A parametrized multipolar gravitational wave phasing within multipolar post-Minkowskian and post-Newtonian formalism was developed in earlier works [S. Kastha et al., PRD 98, 124033 (2018) & S. Kastha et al., PRD 100, 044007 (2019)]. This facilitates the model-agnostic tests for the multipolar structure of compact bina... |
1906.07624 | Saulo Pereira H | S. H. Pereira, R. de C. Lima, J. F. Jesus and R. F. L. Holanda | Acceleration in Friedmann cosmology with torsion | 17 pages, 6 figures | Eur. Phys. J. C (2019) 79: 950 | 10.1140/epjc/s10052-019-7462-4 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Friedmann like cosmological model in Einstein-Cartan framework is studied
when the torsion function is assumed to be proportional to a single $\phi(t)$
function coming just from the spin vector contribution of ordinary matter. By
analysing four different types of torsion function written in terms of one, two
and th... | [
{
"created": "Tue, 18 Jun 2019 14:58:39 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Nov 2019 14:42:17 GMT",
"version": "v2"
}
] | 2019-11-21 | [
[
"Pereira",
"S. H.",
""
],
[
"Lima",
"R. de C.",
""
],
[
"Jesus",
"J. F.",
""
],
[
"Holanda",
"R. F. L.",
""
]
] | A Friedmann like cosmological model in Einstein-Cartan framework is studied when the torsion function is assumed to be proportional to a single $\phi(t)$ function coming just from the spin vector contribution of ordinary matter. By analysing four different types of torsion function written in terms of one, two and thre... |
1409.3101 | H.-J. Schmidt | H.-J. Schmidt | Motion of a thin spherically symmetric Shell of Dust in the
Schwarzschild field | Reprinted from: 10th International Conference on General Relativity
and Gravitation, Padova (Italy) July 4 - 9, 1983. Eds.: B. Bertotti, F. de
Felice, A. Pascolini, Contributed papers Vol. 1, Roma (1983) page 339-341 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of motion announced in the title was already deduced for the
cases the inner metric being flat and the shell being negligibly small (test
matter), using surface layers and geodesic trajectories resp. Here we derive
the general equation of motion and solve it in closed form for the case of
parabolic motio... | [
{
"created": "Wed, 10 Sep 2014 14:56:12 GMT",
"version": "v1"
}
] | 2014-09-11 | [
[
"Schmidt",
"H. -J.",
""
]
] | The equation of motion announced in the title was already deduced for the cases the inner metric being flat and the shell being negligibly small (test matter), using surface layers and geodesic trajectories resp. Here we derive the general equation of motion and solve it in closed form for the case of parabolic motion.... |
2007.04733 | Imre Ferenc Barna Dr. | Imre F. Barna, Mih\'aly A. Pocsai and Gergely G\'abor Barnaf\"oldi | Scaling Hydrodynamical Evolution of a Gravitating Dark-fluid Universe | 8 pages and 5 figures | Mathematics 2022 (10) 3220 | 10.3390/math10183220 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a dark fluid model which contains the general linear equation of
state including the gravitation term. The obtained spherical symmetric Euler
equation and the continuity equation was investigated with the Sedov-type
time-dependent self-similar {\it ansatz} which is capable to describe
physically relevant d... | [
{
"created": "Thu, 9 Jul 2020 12:12:11 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2020 13:54:54 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Sep 2021 15:03:30 GMT",
"version": "v3"
}
] | 2022-09-08 | [
[
"Barna",
"Imre F.",
""
],
[
"Pocsai",
"Mihály A.",
""
],
[
"Barnaföldi",
"Gergely Gábor",
""
]
] | We present a dark fluid model which contains the general linear equation of state including the gravitation term. The obtained spherical symmetric Euler equation and the continuity equation was investigated with the Sedov-type time-dependent self-similar {\it ansatz} which is capable to describe physically relevant dif... |
2106.12273 | Shoichiro Miyashita | Shoichiro Miyashita | Gravitational and Gravitoscalar Thermodynamics | 41 pages, many figures; v2: footnotes added, type corrected | JHEP 09 (2021) 121 | 10.1007/JHEP09(2021)121 | WUCG-21-08 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Gravitational thermodynamics and gravitoscalar thermodynamics with $S^2
\times \mathbb{R}$ boundary geometry are investigated through the partition
function, assuming that all Euclidean saddle point geometries contribute to the
path integral and dominant ones are in the $B^3 \times S^1$ or $S^2 \times
Disc$ topology ... | [
{
"created": "Wed, 23 Jun 2021 09:50:27 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Aug 2021 14:52:22 GMT",
"version": "v2"
}
] | 2021-09-28 | [
[
"Miyashita",
"Shoichiro",
""
]
] | Gravitational thermodynamics and gravitoscalar thermodynamics with $S^2 \times \mathbb{R}$ boundary geometry are investigated through the partition function, assuming that all Euclidean saddle point geometries contribute to the path integral and dominant ones are in the $B^3 \times S^1$ or $S^2 \times Disc$ topology se... |
2311.04075 | Eric Poisson | Tristan Pitre and Eric Poisson | General relativistic dynamical tides in binary inspirals, without modes | 33 pages, 4 figures, 4 tables, matches published version | Phys. Rev. D 109, 064004 (2024) | 10.1103/PhysRevD.109.064004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A neutron star in an inspiraling binary system is tidally deformed by its
companion, and the effect leaves a measurable imprint on the emitted
gravitational waves. While the tidal interaction falls within the regime of
static tides during the early stages of inspiral, a regime of dynamical tides
takes over in the lat... | [
{
"created": "Tue, 7 Nov 2023 15:40:36 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2024 12:38:30 GMT",
"version": "v2"
}
] | 2024-03-07 | [
[
"Pitre",
"Tristan",
""
],
[
"Poisson",
"Eric",
""
]
] | A neutron star in an inspiraling binary system is tidally deformed by its companion, and the effect leaves a measurable imprint on the emitted gravitational waves. While the tidal interaction falls within the regime of static tides during the early stages of inspiral, a regime of dynamical tides takes over in the later... |
gr-qc/0301063 | Nikolai V. Mitskievich | Vladimir N. Efremov and Nikolai V. Mitskievich | Discrete model of spacetime in terms of inverse spectra of the $T_0$
Alexandroff topological spaces | LaTeX, 39 pages, no figures | null | null | null | gr-qc | null | The theory of inverse spectra of $T_0$ Alexandroff topological spaces is used
to construct a model of $T_0$-discrete four-dimensional spacetime. The universe
evolution is interpreted in terms of a sequence of topology changes in the set
of $T_0$-discrete spaces realized as nerves of the canonical partitions of
three-... | [
{
"created": "Fri, 17 Jan 2003 05:00:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Efremov",
"Vladimir N.",
""
],
[
"Mitskievich",
"Nikolai V.",
""
]
] | The theory of inverse spectra of $T_0$ Alexandroff topological spaces is used to construct a model of $T_0$-discrete four-dimensional spacetime. The universe evolution is interpreted in terms of a sequence of topology changes in the set of $T_0$-discrete spaces realized as nerves of the canonical partitions of three-di... |
1401.2810 | Alexey Golovnev | Alexey Golovnev | Smooth horizons and quantum ripples | 4 pages; minor changes, a few references added | The European Physical Journal C 75 (2015) 185 | 10.1140/epjc/s10052-015-3395-8 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black Holes are unique objects which allow for meaningful theoretical studies
of strong gravity and even quantum gravity effects. An infalling and a distant
observer would have very different views on the structure of the world.
However, a careful analysis has shown that it entails no genuine contradictions
for physi... | [
{
"created": "Mon, 13 Jan 2014 12:24:39 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jan 2014 18:02:42 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Feb 2014 17:03:11 GMT",
"version": "v3"
}
] | 2015-05-06 | [
[
"Golovnev",
"Alexey",
""
]
] | Black Holes are unique objects which allow for meaningful theoretical studies of strong gravity and even quantum gravity effects. An infalling and a distant observer would have very different views on the structure of the world. However, a careful analysis has shown that it entails no genuine contradictions for physics... |
2109.01525 | Manuel Hohmann | Manuel Hohmann | General covariant symmetric teleparallel cosmology | 18 pages, no figures | Phys. Rev. D 104 (2021) 124077 | 10.1103/PhysRevD.104.124077 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Symmetric teleparallel gravity theories, in which the gravitational
interaction is attributed to the nonmetricity of a flat, symmetric, but not
metric-compatible affine connection, have been a topic of growing interest in
recent studies. Numerous works study the cosmology of symmetric teleparallel
gravity assuming a ... | [
{
"created": "Thu, 2 Sep 2021 17:10:09 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Dec 2021 19:01:30 GMT",
"version": "v2"
}
] | 2022-01-03 | [
[
"Hohmann",
"Manuel",
""
]
] | Symmetric teleparallel gravity theories, in which the gravitational interaction is attributed to the nonmetricity of a flat, symmetric, but not metric-compatible affine connection, have been a topic of growing interest in recent studies. Numerous works study the cosmology of symmetric teleparallel gravity assuming a fl... |
gr-qc/9301014 | null | James D.E. Grant | On Self-Dual Gravity I | 17 pages, Latex, DAMTP-R92/47 | Phys.Rev. D48 (1993) 2606-2612 | 10.1103/PhysRevD.48.2606 | null | gr-qc hep-th | null | (One typo corrected and one incorrect statement removed. Extra details on
conserved quantities and symmetry algebras added).
| [
{
"created": "Thu, 14 Jan 1993 15:13:15 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Feb 1993 15:36:24 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Grant",
"James D. E.",
""
]
] | (One typo corrected and one incorrect statement removed. Extra details on conserved quantities and symmetry algebras added). |
0908.2874 | Francisco Lobo | Tiberiu Harko, Zoltan Kov\'acs, Francisco S. N. Lobo | Solar system tests of Ho\v{r}ava-Lifshitz gravity | 9 pages, 4 figures. V2: minor changes; accepted for publication in
Proceedings of the Royal Society A | Proc.Roy.Soc.Lond.A Math.Phys.Eng.Sci.467:1390-1407,2011 | 10.1098/rspa.2010.0477 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a renormalizable gravity theory with higher spatial derivatives in
four dimensions was proposed by Ho\v{r}ava. The theory reduces to Einstein
gravity with a non-vanishing cosmological constant in IR, but it has improved
UV behaviors. The spherically symmetric black hole solutions for an arbitrary
cosmologic... | [
{
"created": "Thu, 20 Aug 2009 08:31:17 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Oct 2010 21:26:22 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Harko",
"Tiberiu",
""
],
[
"Kovács",
"Zoltan",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | Recently, a renormalizable gravity theory with higher spatial derivatives in four dimensions was proposed by Ho\v{r}ava. The theory reduces to Einstein gravity with a non-vanishing cosmological constant in IR, but it has improved UV behaviors. The spherically symmetric black hole solutions for an arbitrary cosmological... |
0901.4000 | Alan D. Rendall | Ernesto Nungesser, Alan D. Rendall | Strong cosmic censorship for solutions of the Einstein-Maxwell field
equations with polarized Gowdy symmetry | Some references have been changed | Class.Quant.Grav.26:105019,2009 | 10.1088/0264-9381/26/10/105019 | AEI-2009-006 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A proof of strong cosmic censorship is presented for a class of solutions of
the Einstein-Maxwell equations, those with polarized Gowdy symmetry. A key
element of the argument is the observation that by means of a suitable choice
of variables the central equations in this problem can be written in a form
where they a... | [
{
"created": "Mon, 26 Jan 2009 13:17:05 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2009 14:28:39 GMT",
"version": "v2"
}
] | 2010-08-03 | [
[
"Nungesser",
"Ernesto",
""
],
[
"Rendall",
"Alan D.",
""
]
] | A proof of strong cosmic censorship is presented for a class of solutions of the Einstein-Maxwell equations, those with polarized Gowdy symmetry. A key element of the argument is the observation that by means of a suitable choice of variables the central equations in this problem can be written in a form where they are... |
gr-qc/9509025 | Herbert Balasin | P.C.Aichelburg and H.Balasin | Symmetries of pp-Waves with Distributional Profile | 10 pages, latex2e, no figures, statement about the combination of
symmetry classes of impulsive waves corrected | Class.Quant.Grav. 13 (1996) 723-730 | 10.1088/0264-9381/13/4/012 | UWThPh-1995-30, TUW95-20 | gr-qc | null | We generalize the classification of (non-vacuum) pp-waves \cite{JEK} based on
the Killing-algebra of the space-time by admitting distribution-valued profile
functions. Our approach is based on the analysis of the (infinite-dimensional)
group of ``normal-form-preserving'' diffeomorphisms.
| [
{
"created": "Thu, 14 Sep 1995 12:07:39 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 1995 09:45:59 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Aichelburg",
"P. C.",
""
],
[
"Balasin",
"H.",
""
]
] | We generalize the classification of (non-vacuum) pp-waves \cite{JEK} based on the Killing-algebra of the space-time by admitting distribution-valued profile functions. Our approach is based on the analysis of the (infinite-dimensional) group of ``normal-form-preserving'' diffeomorphisms. |
1608.04543 | Ioannis Dalianis | Ioannis Dalianis, George Koutsoumbas, Konstantinos Ntrekis,
Eleftherios Papantonopoulos | Reheating predictions in Gravity Theories with Derivative Coupling | JCAP version; minor corrections, results unchanged, figures and refs
added compared to v1; 28 pages, 30 plots, plain text | null | 10.1088/1475-7516/2017/02/027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the inflationary predictions of a simple Horndeski theory
where the inflaton scalar field has a non-minimal derivative coupling (NMDC) to
the Einstein tensor. The NMDC is very motivated for the construction of
successful models for inflation, nevertheless its inflationary predictions are
not observatio... | [
{
"created": "Tue, 16 Aug 2016 10:25:13 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 2017 22:58:54 GMT",
"version": "v2"
}
] | 2017-02-22 | [
[
"Dalianis",
"Ioannis",
""
],
[
"Koutsoumbas",
"George",
""
],
[
"Ntrekis",
"Konstantinos",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | We investigate the inflationary predictions of a simple Horndeski theory where the inflaton scalar field has a non-minimal derivative coupling (NMDC) to the Einstein tensor. The NMDC is very motivated for the construction of successful models for inflation, nevertheless its inflationary predictions are not observationa... |
2305.08909 | Alexandre Toubiana | Alexandre Toubiana and Michael L. Katz and Jonathan R. Gair | Is there an excess of black holes around $20 M_{\odot}$? Optimising the
complexity of population models with the use of reversible jump MCMC | correct typo in equation 5 | null | 10.1093/mnras/stad2215 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some analyses of the third gravitational wave catalogue released by the
LIGO-Virgo-KAGRA collaboration (LVK) suggest an excess of black holes around
$15-20 M_{\odot}$. In order to investigate this feature, we introduce two
flexible population models, a semi-parametric one and a non-parametric one.
Both make use of re... | [
{
"created": "Mon, 15 May 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jul 2023 18:30:08 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Sep 2023 10:00:47 GMT",
"version": "v3"
}
] | 2023-10-02 | [
[
"Toubiana",
"Alexandre",
""
],
[
"Katz",
"Michael L.",
""
],
[
"Gair",
"Jonathan R.",
""
]
] | Some analyses of the third gravitational wave catalogue released by the LIGO-Virgo-KAGRA collaboration (LVK) suggest an excess of black holes around $15-20 M_{\odot}$. In order to investigate this feature, we introduce two flexible population models, a semi-parametric one and a non-parametric one. Both make use of reve... |
1111.0327 | Emanuel Gallo | Emanuel Gallo and Osvaldo Moreschi | Peculiar anisotropic stationary spherically symmetric solution of
Einstein equations | 6 pages, 5 figures. To appear in Modern Physics Letters A | Mod. Phys.Lett. A 1250044 (2012) | 10.1142/S0217732312500447 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by studies on gravitational lenses, we present an exact solution of
the field equations of general relativity, which is static and spherically
symmetric, has no mass but has a non-vanishing spacelike components of the
stress-energy-momentum tensor. In spite of its strange nature, this solution
provides with... | [
{
"created": "Tue, 1 Nov 2011 21:51:08 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2012 14:42:14 GMT",
"version": "v2"
}
] | 2012-03-15 | [
[
"Gallo",
"Emanuel",
""
],
[
"Moreschi",
"Osvaldo",
""
]
] | Motivated by studies on gravitational lenses, we present an exact solution of the field equations of general relativity, which is static and spherically symmetric, has no mass but has a non-vanishing spacelike components of the stress-energy-momentum tensor. In spite of its strange nature, this solution provides with n... |
1710.07838 | Vasilis Oikonomou | S. Nojiri, S.D. Odintsov, V.K. Oikonomou | Ghost-Free $F(R)$ Gravity with Lagrange Multiplier Constraint | PLB Accepted | null | 10.1016/j.physletb.2017.10.045 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose two new versions of ghost-free generalized $F(R)$ gravity with
Lagrange multiplier constraint. The first version of such theory for a
particular degenerate choice of the Lagrange multiplier, corresponds to mimetic
$F(R)$ gravity. The second version of such theory is just the Jordan frame
description of mim... | [
{
"created": "Sat, 21 Oct 2017 18:27:23 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Nojiri",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | We propose two new versions of ghost-free generalized $F(R)$ gravity with Lagrange multiplier constraint. The first version of such theory for a particular degenerate choice of the Lagrange multiplier, corresponds to mimetic $F(R)$ gravity. The second version of such theory is just the Jordan frame description of mimet... |
1808.05134 | Anzhong Wang | Manabendra Sharma, M. Shahalam, Wu Qiang, and Anzhong Wang | Preinflationary dynamics in loop quantum cosmology: Monodromy Potential | revtex4, seven figures and five tables. Version to appear in JCAP | JCAP11(2018)003 | 10.1088/1475-7516/2018/11/003 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we explore the pre-inflationary background dynamics of an
FLRW universe sourced by a scalar field with monodromy potential in LQC
framework. In particular we calculate the number of e-folds, $N_{inf}$,
produced during the slowly rolling phase of the inflation and find out the
critical value of the rat... | [
{
"created": "Mon, 13 Aug 2018 08:35:02 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2018 10:01:49 GMT",
"version": "v2"
}
] | 2018-11-15 | [
[
"Sharma",
"Manabendra",
""
],
[
"Shahalam",
"M.",
""
],
[
"Qiang",
"Wu",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this article we explore the pre-inflationary background dynamics of an FLRW universe sourced by a scalar field with monodromy potential in LQC framework. In particular we calculate the number of e-folds, $N_{inf}$, produced during the slowly rolling phase of the inflation and find out the critical value of the ratio... |
1603.08263 | Carlos Coimbra-Araujo | C. H. Coimbra-Araujo and R. C. Anjos | Stability of perturbed geodesics in $nD$ axisymmetric spacetimes | 21 pages, 7 figures, published in Classical and Quantum Gravity | Classical and Quantum Gravity, Volume 33, Number 18, 185010, 2016 | 10.1088/0264-9381/33/18/185010 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | The effect of self-gravity of a disk matter is evaluated by the simplest
modes of oscillation frequencies for perturbed circular geodesics. It is
plotted the radial profiles of free oscillations of an equatorial circular
geodesic perturbed within the orbital plane or in the vertical direction. The
calculation is carr... | [
{
"created": "Sun, 27 Mar 2016 22:26:01 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Sep 2016 23:14:06 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Coimbra-Araujo",
"C. H.",
""
],
[
"Anjos",
"R. C.",
""
]
] | The effect of self-gravity of a disk matter is evaluated by the simplest modes of oscillation frequencies for perturbed circular geodesics. It is plotted the radial profiles of free oscillations of an equatorial circular geodesic perturbed within the orbital plane or in the vertical direction. The calculation is carrie... |
2310.06899 | Sumanta Chakraborty | Sumanta Chakraborty, Anupam Mazumdar and Ritapriya Pradhan | Distinguishing Jordan and Einstein frames in gravity through
entanglement | v2, published version, 10 pages, 2 figures | Phy. Rev. D 108, L121505 (2023) | 10.1103/PhysRevD.108.L121505 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity, the use of conformal transformation is ubiquitous and
leads to two different frames of reference, known as the Jordan and the
Einstein frames. Typically, the transformation from the Jordan frame to the
Einstein frame involves introducing an additional scalar degree of freedom,
often already pre... | [
{
"created": "Tue, 10 Oct 2023 18:00:26 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jan 2024 02:11:43 GMT",
"version": "v2"
}
] | 2024-01-25 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"Mazumdar",
"Anupam",
""
],
[
"Pradhan",
"Ritapriya",
""
]
] | In general relativity, the use of conformal transformation is ubiquitous and leads to two different frames of reference, known as the Jordan and the Einstein frames. Typically, the transformation from the Jordan frame to the Einstein frame involves introducing an additional scalar degree of freedom, often already prese... |
gr-qc/0107074 | M. Raiteri | M. Francaviglia, M. Raiteri | Hamiltonian, Energy and Entropy in General Relativity with
Non-Orthogonal Boundaries | 29 pages with 1 figure | Class.Quant.Grav.19:237-258,2002 | 10.1088/0264-9381/19/2/305 | null | gr-qc | null | A general recipe to define, via Noether theorem, the Hamiltonian in any
natural field theory is suggested. It is based on a Regge-Teitelboim-like
approach applied to the variation of Noether conserved quantities. The
Hamiltonian for General Relativity in presence of non-orthogonal boundaries is
analysed and the energ... | [
{
"created": "Mon, 23 Jul 2001 11:56:58 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Francaviglia",
"M.",
""
],
[
"Raiteri",
"M.",
""
]
] | A general recipe to define, via Noether theorem, the Hamiltonian in any natural field theory is suggested. It is based on a Regge-Teitelboim-like approach applied to the variation of Noether conserved quantities. The Hamiltonian for General Relativity in presence of non-orthogonal boundaries is analysed and the energy ... |
1408.2788 | Alexander Graham | Alexander A. H. Graham | Varying-Alpha and K-Essence | 14 pages, 3 figures. v2: typos corrected, references added and some
additional comments. Matches published version | Class. Quantum Grav. 32, 015019 (2015) | 10.1088/0264-9381/32/1/015019 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a model which allows the fine structure constant (alpha) to vary
throughout space and time due to a coupling to a scalar field with a
non-canonical kinetic structure. This provided a new extension of the
Bekenstein-Sandvik-Barrow-Magueijo model of alpha variations. The background
cosmology is studied in ... | [
{
"created": "Tue, 12 Aug 2014 17:54:11 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2015 17:33:22 GMT",
"version": "v2"
}
] | 2015-01-20 | [
[
"Graham",
"Alexander A. H.",
""
]
] | We introduce a model which allows the fine structure constant (alpha) to vary throughout space and time due to a coupling to a scalar field with a non-canonical kinetic structure. This provided a new extension of the Bekenstein-Sandvik-Barrow-Magueijo model of alpha variations. The background cosmology is studied in de... |
1607.02476 | Luis L\'opez | N. Breton and L. A. Lopez | Quasinormal modes of nonlinear electromagnetic black holes from unstable
null geodesics | null | Phys. Rev. D 94, 104008 (2016) | 10.1103/PhysRevD.94.104008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The expressions for the quasinormal modes (QNMs) of black holes with
nonlinear electrodynamics, calculated in the eikonal approximation, are
presented. In the eikonal limit QNMs of black holes are determined by the
parameters of the circular null geodesics. The unstable circular null orbits
are derived from the effec... | [
{
"created": "Fri, 8 Jul 2016 18:05:19 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Breton",
"N.",
""
],
[
"Lopez",
"L. A.",
""
]
] | The expressions for the quasinormal modes (QNMs) of black holes with nonlinear electrodynamics, calculated in the eikonal approximation, are presented. In the eikonal limit QNMs of black holes are determined by the parameters of the circular null geodesics. The unstable circular null orbits are derived from the effecti... |
1702.04916 | Abdulla Al Mamon | Abdulla Al Mamon | Constraints on a generalized deceleration parameter from cosmic
chronometers | 9 pages, 5 figures, minor change in title, new references added,
revised version accepted for publication in MPLA | null | 10.1142/S0217732318500566 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have proposed a generalized parametrization for the
deceleration parameter $q$ in order to study the evolutionary history of the
universe. We have shown that the proposed model can reproduce three well known
$q$-parametrized models for some specific values of the model parameter
$\alpha$. We have us... | [
{
"created": "Thu, 16 Feb 2017 10:34:17 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Mar 2018 19:36:04 GMT",
"version": "v2"
}
] | 2018-04-25 | [
[
"Mamon",
"Abdulla Al",
""
]
] | In this paper, we have proposed a generalized parametrization for the deceleration parameter $q$ in order to study the evolutionary history of the universe. We have shown that the proposed model can reproduce three well known $q$-parametrized models for some specific values of the model parameter $\alpha$. We have used... |
1510.03131 | Sergei Kopeikin | Sergei Kopeikin (University of Missouri, USA), Wenbiao Han (Shanghai
Astronomical Observatory), Elena Mazurova (Siberian State University of
Geosystems and Technologies, Russia) | Post-Newtonian reference-ellipsoid for relativistic geodesy | 32 pages, 2 figures, 71 references. Text improved and extended, one
more figure included | Phys. Rev. D 93, 044069 (2016) | 10.1103/PhysRevD.93.044069 | null | gr-qc math-ph math.MP physics.geo-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply general relativity to construct the post-Newtonian background
manifold that serves as a reference spacetime in relativistic geodesy for
conducting relativistic calculation of the geoid's undulation and the
deflection of the plumb line from the vertical. We chose an axisymmetric
ellipsoidal body made up of pe... | [
{
"created": "Mon, 12 Oct 2015 03:55:16 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jan 2016 23:36:32 GMT",
"version": "v2"
}
] | 2016-03-02 | [
[
"Kopeikin",
"Sergei",
"",
"University of Missouri, USA"
],
[
"Han",
"Wenbiao",
"",
"Shanghai\n Astronomical Observatory"
],
[
"Mazurova",
"Elena",
"",
"Siberian State University of\n Geosystems and Technologies, Russia"
]
] | We apply general relativity to construct the post-Newtonian background manifold that serves as a reference spacetime in relativistic geodesy for conducting relativistic calculation of the geoid's undulation and the deflection of the plumb line from the vertical. We chose an axisymmetric ellipsoidal body made up of perf... |
1003.1014 | Isabel Cordero-Carri\'on | Isabel Cordero-Carri\'on, Jos\'e Mar\'ia Ib\'a\~nez and Juan Antonio
Morales-Lladosa | On the local existence of maximal slicings in spherically symmetric
spacetimes | 4 pages. Accepted for publication in Journal of Physics: Conference
Series, Proceedings of the Spanish Relativity Meeting ERE2009 | null | 10.1088/1742-6596/229/1/012029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we show that any spherically symmetric spacetime admits locally
a maximal spacelike slicing. The above condition is reduced to solve a
decoupled system of first order quasi-linear partial differential equations.
The solution may be accomplished analytical or numerically. We provide a
general procedure to... | [
{
"created": "Thu, 4 Mar 2010 10:56:00 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Cordero-Carrión",
"Isabel",
""
],
[
"Ibáñez",
"José María",
""
],
[
"Morales-Lladosa",
"Juan Antonio",
""
]
] | In this talk we show that any spherically symmetric spacetime admits locally a maximal spacelike slicing. The above condition is reduced to solve a decoupled system of first order quasi-linear partial differential equations. The solution may be accomplished analytical or numerically. We provide a general procedure to c... |
1502.04953 | Bela Szilagyi | Bela Szilagyi, Jonathan Blackman, Alessandra Buonanno, Andrea
Taracchini, Harald P. Pfeiffer, Mark A. Scheel, Tony Chu, Lawrence E. Kidder
and Yi Pan | Numerical relativity reaching into post-Newtonian territory: a
compact-object binary simulation spanning 350 gravitational-wave cycles | null | Phys. Rev. Lett. 115, 031102 (2015) | 10.1103/PhysRevLett.115.031102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first numerical-relativity simulation of a compact-object
binary whose gravitational waveform is long enough to cover the entire
frequency band of advanced gravitational-wave detectors, such as LIGO, Virgo
and KAGRA, for mass ratio 7 and total mass as low as $45.5\,M_\odot$. We find
that effective-one-... | [
{
"created": "Tue, 17 Feb 2015 16:32:34 GMT",
"version": "v1"
}
] | 2015-07-22 | [
[
"Szilagyi",
"Bela",
""
],
[
"Blackman",
"Jonathan",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Taracchini",
"Andrea",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Chu",
"Tony",
""
... | We present the first numerical-relativity simulation of a compact-object binary whose gravitational waveform is long enough to cover the entire frequency band of advanced gravitational-wave detectors, such as LIGO, Virgo and KAGRA, for mass ratio 7 and total mass as low as $45.5\,M_\odot$. We find that effective-one-bo... |
gr-qc/0503004 | Arunava Bhadra Dr. | Arunava Bhadra and Kabita Sarkar | Wormholes in vacuum Brans-Dicke theory | 13 pages, accepted by Mod. Phys. Letts. A, typos in references
corrected | Mod.Phys.Lett.A20:1831-1844,2005 | 10.1142/S0217732305016889 | null | gr-qc | null | It is shown that among the different classes of claimed static wormhole
solutions of the vacuum Brans-Dicke theory only Brans Class I solution with
coupling constant $\omega$ less than -1.5 (excluding the point $\omega =2$)
gives rise to physically viable traversable wormhole geometry. Usability of
this wormhole geom... | [
{
"created": "Tue, 1 Mar 2005 17:32:14 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Feb 2006 08:06:06 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Bhadra",
"Arunava",
""
],
[
"Sarkar",
"Kabita",
""
]
] | It is shown that among the different classes of claimed static wormhole solutions of the vacuum Brans-Dicke theory only Brans Class I solution with coupling constant $\omega$ less than -1.5 (excluding the point $\omega =2$) gives rise to physically viable traversable wormhole geometry. Usability of this wormhole geomet... |
gr-qc/0006049 | Fredrik Stahl | Fredrik St{\aa}hl | The Geometry of the Frame Bundle over Spacetime | 14 pages, no figures, LaTeX 2e with AMSLaTeX 1.2 and AMSFonts,
submitted to J. Math. Phys | null | null | null | gr-qc | null | One of the known mathematical descriptions of singularities in General
Relativity is the b-boundary, which is a way of attaching endpoints to
inextendible endless curves in a spacetime. The b-boundary of a manifold M with
connection is constructed by forming the Cauchy completion of the frame bundle
LM equipped with ... | [
{
"created": "Tue, 13 Jun 2000 21:09:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ståhl",
"Fredrik",
""
]
] | One of the known mathematical descriptions of singularities in General Relativity is the b-boundary, which is a way of attaching endpoints to inextendible endless curves in a spacetime. The b-boundary of a manifold M with connection is constructed by forming the Cauchy completion of the frame bundle LM equipped with a ... |
2301.08743 | Shibesh Kumar Jas Pacif | Keshav Ram Mishra, Shibesh Kumar Jas Pacif, Rajesh Kumar, Kazuharu
Bamba | Cosmological implications of an interacting model of dark matter \& dark
energy | arXiv admin note: text overlap with arXiv:1903.08562 by other authors | Physics of the Dark Universe Volume 40, 101211, May 2023 | 10.1016/j.dark.2023.101211 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have studied an interacting dark energy model. We have
assumed the gravitational interaction between the matter fields i.e. between
barotropic fluid and the dark energy. The dark energy evolution within the
framework of spatially homogeneous and isotropic Friedmann-Robertson-Walker
space-time. There... | [
{
"created": "Thu, 19 Jan 2023 21:19:03 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2023 18:39:09 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Mar 2023 18:35:09 GMT",
"version": "v3"
}
] | 2023-04-03 | [
[
"Mishra",
"Keshav Ram",
""
],
[
"Pacif",
"Shibesh Kumar Jas",
""
],
[
"Kumar",
"Rajesh",
""
],
[
"Bamba",
"Kazuharu",
""
]
] | In this paper, we have studied an interacting dark energy model. We have assumed the gravitational interaction between the matter fields i.e. between barotropic fluid and the dark energy. The dark energy evolution within the framework of spatially homogeneous and isotropic Friedmann-Robertson-Walker space-time. Therefo... |
gr-qc/0508059 | Thomas Buchert | Thomas Buchert | An exact Lagrangian integral for the Newtonian gravitational field
strength | 15 pages, section on applications added; matches published version in
Phys.Lett.A | Phys.Lett. A354 (2006) 8-14 | 10.1016/j.physleta.2006.01.045 | null | gr-qc astro-ph math-ph math.MP | null | An exact expression for the gravitational field strength in a
self-gravitating dust continuum is derived within the Lagrangian picture of
continuum mechanics. From the Euler-Newton system a transport equation for the
gravitational field strength is formulated and then integrated along
trajectories of continuum elemen... | [
{
"created": "Mon, 15 Aug 2005 12:50:40 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Dec 2005 17:35:26 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Jan 2006 18:49:32 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Buchert",
"Thomas",
""
]
] | An exact expression for the gravitational field strength in a self-gravitating dust continuum is derived within the Lagrangian picture of continuum mechanics. From the Euler-Newton system a transport equation for the gravitational field strength is formulated and then integrated along trajectories of continuum elements... |
0904.3377 | M Hossain Ali | M. Hossain Ali and M. Khayrul Hasan | Dispersion Relations for Cold Plasmas around Reissner-Nordstr\"om Black
Holes | 25 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the general relativistic magnetohydrodynamic (GRMHD) equations
for cold plasma around the Reissner-Nordstr\"om black hole. Applying 3+1
spacetime split we linearize the perturbed equations for
non-magnetized/magnetized plasma in both rotating and non-rotating background.
By Fourier analyze we then deri... | [
{
"created": "Wed, 22 Apr 2009 03:06:24 GMT",
"version": "v1"
}
] | 2009-04-23 | [
[
"Ali",
"M. Hossain",
""
],
[
"Hasan",
"M. Khayrul",
""
]
] | We investigate the general relativistic magnetohydrodynamic (GRMHD) equations for cold plasma around the Reissner-Nordstr\"om black hole. Applying 3+1 spacetime split we linearize the perturbed equations for non-magnetized/magnetized plasma in both rotating and non-rotating background. By Fourier analyze we then derive... |
1711.07966 | Daniel George | Daniel George and E. A. Huerta | Deep Learning for Real-time Gravitational Wave Detection and Parameter
Estimation with LIGO Data | Camera-ready (final) version accepted to NIPS 2017 conference
workshop on Deep Learning for Physical Sciences and selected for contributed
talk. Also awarded 1st place at ACM SRC at SC17. Extended article:
arXiv:1711.03121 | null | null | null | gr-qc astro-ph.HE astro-ph.IM cs.LG cs.NE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent Nobel-prize-winning detections of gravitational waves from merging
black holes and the subsequent detection of the collision of two neutron stars
in coincidence with electromagnetic observations have inaugurated a new era of
multimessenger astrophysics. To enhance the scope of this emergent science, we
pro... | [
{
"created": "Tue, 21 Nov 2017 18:45:01 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2017 19:36:44 GMT",
"version": "v2"
}
] | 2017-12-13 | [
[
"George",
"Daniel",
""
],
[
"Huerta",
"E. A.",
""
]
] | The recent Nobel-prize-winning detections of gravitational waves from merging black holes and the subsequent detection of the collision of two neutron stars in coincidence with electromagnetic observations have inaugurated a new era of multimessenger astrophysics. To enhance the scope of this emergent science, we propo... |
2105.06090 | Hwajin Eom | Hwajin Eom, Wontae Kim | Quantum radiation of a collapsing shell in three-dimensional AdS
spacetime revisited | 15 pages, 1 figure, references and comments are added, published
version in JHEP | null | 10.1007/JHEP07(2021)108 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In three-dimensional AdS space, we consider the gravitational collapse of
dust shell and then investigate the quantum radiation from the collapsing shell
by employing the functional Schr\"odinger formalism. In the formation of the
BTZ black hole, the interior geometry of the shell can be chosen as either the
massless... | [
{
"created": "Thu, 13 May 2021 05:39:18 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2021 08:32:23 GMT",
"version": "v2"
}
] | 2021-07-21 | [
[
"Eom",
"Hwajin",
""
],
[
"Kim",
"Wontae",
""
]
] | In three-dimensional AdS space, we consider the gravitational collapse of dust shell and then investigate the quantum radiation from the collapsing shell by employing the functional Schr\"odinger formalism. In the formation of the BTZ black hole, the interior geometry of the shell can be chosen as either the massless b... |
gr-qc/0209069 | Dilek Ciftci | Metin Arik, Dilek Ciftci | A Finslerian Cosmological Metric and its Riemannian Kaluza-Klein
Extension | 5 pages | Grav.Cosmol.9:259-261,2003 | null | null | gr-qc | null | In this study a rotationally and translationally invariant metric in Finsler
space is investigated. We choose to rewrite the metric in Riemanian space by
increasing the dimension of space-time and introducing additional coordinates
such that for specific values of these coordinates, the geodesics of the four
dimensio... | [
{
"created": "Fri, 20 Sep 2002 12:30:51 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Arik",
"Metin",
""
],
[
"Ciftci",
"Dilek",
""
]
] | In this study a rotationally and translationally invariant metric in Finsler space is investigated. We choose to rewrite the metric in Riemanian space by increasing the dimension of space-time and introducing additional coordinates such that for specific values of these coordinates, the geodesics of the four dimensiona... |
1312.0254 | Piotr T. Chru\'sciel | Piotr T. Chrusciel | Boundary conditions at spatial infinity from a Hamiltonian point of view | Published in "Topological Properties and Global Structure of
Space-Time", ed. by P. Bergmann, V. de Sabbata, pp. 49-59, Plenum Press, New
York 1986 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the ADM mass and momentum are geometric invariants of
asymptotically flat initial data sets
| [
{
"created": "Sun, 1 Dec 2013 17:54:12 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Dec 2013 16:25:43 GMT",
"version": "v2"
}
] | 2013-12-09 | [
[
"Chrusciel",
"Piotr T.",
""
]
] | We show that the ADM mass and momentum are geometric invariants of asymptotically flat initial data sets |
gr-qc/0611002 | Paul Lasky | P. D. Lasky and A. W. C. Lun | Spherically Symmetric Gravitational Collapse of Perfect Fluids | 3 pages, To appear in the proceedings of the eleventh Marcel
Grossmann meeting on general relativity (MGXI), 23-29 July, 2006, Berlin | null | null | null | gr-qc | null | Formulating a perfect fluid filled spherically symmetric metric utilizing the
3+1 formalism for general relativity, we show that the metric coefficients are
completely determined by the mass-energy distribution, and its time rate of
change on an initial spacelike hypersurface. Rather than specifying
Schwarzschild coo... | [
{
"created": "Tue, 31 Oct 2006 22:36:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lasky",
"P. D.",
""
],
[
"Lun",
"A. W. C.",
""
]
] | Formulating a perfect fluid filled spherically symmetric metric utilizing the 3+1 formalism for general relativity, we show that the metric coefficients are completely determined by the mass-energy distribution, and its time rate of change on an initial spacelike hypersurface. Rather than specifying Schwarzschild coord... |
0910.4677 | Federico Piazza | Federico Piazza | New views on the low-energy side of gravity | Review based on talks given at DICE (Castiglioncello) 2008, Emergent
gravity III (Boston 2008) and IV (Vancouver 2009), New Prospects for Solving
the Cosmological Constant Problem (Perimeter Institute 2009) and several
other more or less informal discussions. 51 pages, 2 figures. References
added | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Common wisdom associates all the unraveled and theoretically challenging
aspects of gravity with its UV-completion. However, there appear to be few
difficulties afflicting the effective framework for gravity already at low
energy, that are likely to be detached from the high-energy structure. Those
include the black ... | [
{
"created": "Mon, 26 Oct 2009 19:59:48 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Oct 2009 21:36:35 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jan 2010 18:35:12 GMT",
"version": "v3"
}
] | 2010-01-20 | [
[
"Piazza",
"Federico",
""
]
] | Common wisdom associates all the unraveled and theoretically challenging aspects of gravity with its UV-completion. However, there appear to be few difficulties afflicting the effective framework for gravity already at low energy, that are likely to be detached from the high-energy structure. Those include the black ho... |
1905.02967 | Tomi Koivisto | Tomi Koivisto, Manuel Hohmann, Tom Z{\l}o\'snik | The General Linear Cartan Khronon | 6 pages, no figures. Contribution to the proceedings of the
conference "Teleparallel Universes in Salamanca" | Universe 2019, 5(7), 168 | 10.3390/universe5070168 | NORDITA 2019-045 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Cartan geometry of the General Linear symmetry is formulated by dividing
out the displacements from the group. The resulting action is quadratic in
curvature, polynomial in all the (minimal) variables, and describes an observer
space that, in the symmetry-broken phase, reproduces the predictions of General
Relativi... | [
{
"created": "Wed, 8 May 2019 09:12:03 GMT",
"version": "v1"
}
] | 2021-04-02 | [
[
"Koivisto",
"Tomi",
""
],
[
"Hohmann",
"Manuel",
""
],
[
"Złośnik",
"Tom",
""
]
] | A Cartan geometry of the General Linear symmetry is formulated by dividing out the displacements from the group. The resulting action is quadratic in curvature, polynomial in all the (minimal) variables, and describes an observer space that, in the symmetry-broken phase, reproduces the predictions of General Relativity... |
1307.4122 | Mauricio Cataldo MC | Mauricio Cataldo, Sebastian Bahamonde and Fernanda Arostica | (N+1)-dimensional Lorentzian evolving wormholes supported by polytropic
matter | 6 pages, 2 figures, accepted for publication in European Physical
Journal C | Eur. Phys. J. C 73, 2517 (2013) | 10.1140/epjc/s10052-013-2517-4 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study $(N+1)$-dimensional evolving wormholes supported by
energy satisfying a polytropic equation of state. The considered evolving
wormhole models are described by a constant redshift function and generalizes
the standard flat Friedmann-Robertson-Walker spacetime. The polytropic equation
of state al... | [
{
"created": "Mon, 15 Jul 2013 22:42:46 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Cataldo",
"Mauricio",
""
],
[
"Bahamonde",
"Sebastian",
""
],
[
"Arostica",
"Fernanda",
""
]
] | In this paper we study $(N+1)$-dimensional evolving wormholes supported by energy satisfying a polytropic equation of state. The considered evolving wormhole models are described by a constant redshift function and generalizes the standard flat Friedmann-Robertson-Walker spacetime. The polytropic equation of state allo... |
gr-qc/0310125 | Leor Barack | Leor Barack and Curt Cutler | LISA Capture Sources: Approximate Waveforms, Signal-to-Noise Ratios, and
Parameter Estimation Accuracy | 34 pages, 27 eps figures; corrected factor 3/4 error in some formulae
for S_h | Phys.Rev. D69 (2004) 082005 | 10.1103/PhysRevD.69.082005 | null | gr-qc astro-ph | null | Captures of stellar-mass compact objects (COs) by massive ($\sim 10^6
M_\odot$) black holes (MBHs) are potentially an important source for LISA, the
proposed space-based gravitational-wave (GW) detector. The orbits of the
inspiraling COs are highly complicated; they can remain rather eccentric up
until the final plun... | [
{
"created": "Thu, 30 Oct 2003 01:27:41 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 2004 20:38:53 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Sep 2004 09:29:13 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Barack",
"Leor",
""
],
[
"Cutler",
"Curt",
""
]
] | Captures of stellar-mass compact objects (COs) by massive ($\sim 10^6 M_\odot$) black holes (MBHs) are potentially an important source for LISA, the proposed space-based gravitational-wave (GW) detector. The orbits of the inspiraling COs are highly complicated; they can remain rather eccentric up until the final plunge... |
1402.4161 | Jorge Rocha | Jorge V. Rocha, Raphael Santarelli and T\'erence Delsate | Collapsing rotating shells in Myers-Perry-AdS$_5$ spacetime: A
perturbative approach | 13 pages, 1 figure, uses revtex4; v2: typos corrected, minor addition
regarding the one-point function of boundary stress-energy tensor, matches
published version | Phys. Rev. D 89, 104006 (2014) | 10.1103/PhysRevD.89.104006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational perturbations sourced by a rotating test shell
collapsing into five-dimensional Myers-Perry black holes in anti-de Sitter
(AdS). Our attention is restricted to the case in which the two possible
angular momenta of the geometry are set equal. In this situation the background
is cohomogeneity-1, ... | [
{
"created": "Mon, 17 Feb 2014 22:00:08 GMT",
"version": "v1"
},
{
"created": "Fri, 23 May 2014 10:28:53 GMT",
"version": "v2"
}
] | 2014-05-26 | [
[
"Rocha",
"Jorge V.",
""
],
[
"Santarelli",
"Raphael",
""
],
[
"Delsate",
"Térence",
""
]
] | We study gravitational perturbations sourced by a rotating test shell collapsing into five-dimensional Myers-Perry black holes in anti-de Sitter (AdS). Our attention is restricted to the case in which the two possible angular momenta of the geometry are set equal. In this situation the background is cohomogeneity-1, wh... |
gr-qc/9605006 | Anders H\vglund | S. Brian Edgar (Department of Mathematics, Link\"oping University) and
Garry Ludwig (Department of Mathematical Sciences, University of Alberta) | Integration in the GHP formalism II: An operator approach for spacetimes
with killing vectors, with applications to twisting type n spaces | 41 pages, plain TeX | null | 10.1023/A:1010200113770 | null | gr-qc | null | Held has proposed a coordinate- and gauge-free integration procedure within
the GHP formalism built around four functionally independent zero-weighted
scalars constructed from the spin coefficients and the Riemann tensor
components. Unfortunately, a spacetime with Killing vectors will be unable to
supply the full quo... | [
{
"created": "Thu, 2 May 1996 11:39:39 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Edgar",
"S. Brian",
"",
"Department of Mathematics, Linköping University"
],
[
"Ludwig",
"Garry",
"",
"Department of Mathematical Sciences, University of Alberta"
]
] | Held has proposed a coordinate- and gauge-free integration procedure within the GHP formalism built around four functionally independent zero-weighted scalars constructed from the spin coefficients and the Riemann tensor components. Unfortunately, a spacetime with Killing vectors will be unable to supply the full quota... |
2112.05788 | Patrick Peter | Claus Kiefer and Patrick Peter | Time in quantum cosmology | 18 pages, 3 figures | Universe 2022, 8, 36 | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Time in quantum gravity is not a well-defined notion, despite its central
role in the very definition of dynamics. Using the formalism of quantum
geometrodynamics, we shortly review the problem and illustrate it with two
proposed solutions. Our main application is quantum cosmology -- the
application of quantum gravi... | [
{
"created": "Fri, 10 Dec 2021 19:16:25 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2022 19:16:45 GMT",
"version": "v2"
}
] | 2022-01-12 | [
[
"Kiefer",
"Claus",
""
],
[
"Peter",
"Patrick",
""
]
] | Time in quantum gravity is not a well-defined notion, despite its central role in the very definition of dynamics. Using the formalism of quantum geometrodynamics, we shortly review the problem and illustrate it with two proposed solutions. Our main application is quantum cosmology -- the application of quantum gravity... |
1205.3404 | Douglas A. Singleton | Sujoy Kumar Modak and Douglas Singleton | Hawking Radiation as a Mechanism for Inflation | 6 pages. Published version -- Awarded "Honorable Mention" for the
2012 Gravity Research Foundation Essay Contest | Int.J.Mod.Phys.D21,1242020(2012) | 10.1142/S0218271812420205 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Friedman-Robertson-Walker (FRW) space-time exhibits particle creation
similar to Hawking radiation of a black hole. In this essay we show that this
FRW Hawking radiation leads to an effective negative pressure fluid which can
drive an inflationary period of exponential expansion in the early Universe.
Since the H... | [
{
"created": "Tue, 15 May 2012 15:03:20 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Nov 2012 09:49:33 GMT",
"version": "v2"
}
] | 2012-11-20 | [
[
"Modak",
"Sujoy Kumar",
""
],
[
"Singleton",
"Douglas",
""
]
] | The Friedman-Robertson-Walker (FRW) space-time exhibits particle creation similar to Hawking radiation of a black hole. In this essay we show that this FRW Hawking radiation leads to an effective negative pressure fluid which can drive an inflationary period of exponential expansion in the early Universe. Since the Haw... |
gr-qc/9811036 | Clifford M. Will | Clifford M. Will (Washington University, St. Louis) | The Confrontation between General Relativity and Experiment: A 1998
Update | Lecture notes from the 1998 Slac Summer Institute on Particle
Physics; 76 pages, 10 figures | ECONFC9808031:02,1998 | null | null | gr-qc | null | The status of experimental tests of general relativity and of theoretical
frameworks for analysing them are reviewed. Einstein's equivalence principle
(EEP) is well supported by experiments such as the E\"otv\"os experiment, tests
of special relativity, and the gravitational redshift experiment. Future tests
of EEP w... | [
{
"created": "Wed, 11 Nov 1998 19:48:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Will",
"Clifford M.",
"",
"Washington University, St. Louis"
]
] | The status of experimental tests of general relativity and of theoretical frameworks for analysing them are reviewed. Einstein's equivalence principle (EEP) is well supported by experiments such as the E\"otv\"os experiment, tests of special relativity, and the gravitational redshift experiment. Future tests of EEP wil... |
2008.02921 | Atsushi Nishizawa | KAGRA Collaboration: T. Akutsu, M. Ando, K. Arai, Y. Arai, S. Araki,
A. Araya, N. Aritomi, H. Asada, Y. Aso, S. Bae, Y. Bae, L. Baiotti, R.
Bajpai, M. A. Barton, K. Cannon, Z. Cao, E. Capocasa, M. Chan, C. Chen, K.
Chen, Y. Chen, C-Y. Chiang, H. Chu, Y-K. Chu, S. Eguchi, Y. Enomoto, R.
Flaminio, Y. Fujii, F. Fu... | Overview of KAGRA : KAGRA science | 73 pages, 11 figures, accepted by Progress of Theoretical and
Experimental Physics, in the series of KAGRA-featured articles | null | null | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | KAGRA is a newly build gravitational-wave observatory, a laser interferometer
with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper in the
series of KAGRA-featured articles, we discuss the science targets of KAGRA
projects, considering not only the baseline KAGRA (current design) but also its
future up... | [
{
"created": "Fri, 7 Aug 2020 01:01:36 GMT",
"version": "v1"
}
] | 2020-08-10 | [
[
"KAGRA Collaboration",
"",
""
],
[
"Akutsu",
"T.",
""
],
[
"Ando",
"M.",
""
],
[
"Arai",
"K.",
""
],
[
"Arai",
"Y.",
""
],
[
"Araki",
"S.",
""
],
[
"Araya",
"A.",
""
],
[
"Aritomi",
"N.",
""... | KAGRA is a newly build gravitational-wave observatory, a laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper in the series of KAGRA-featured articles, we discuss the science targets of KAGRA projects, considering not only the baseline KAGRA (current design) but also its future upgr... |
2002.05481 | Saskia Grunau | Jens-Christian Drawer and Saskia Grunau | Geodesic motion around a supersymmetric AdS5 black hole | 15 pages, 13 figures | Eur. Phys. J. C 80, no.6, 536 (2020) | 10.1140/epjc/s10052-020-8101-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article the geodesic motion of test particles in the spacetime of a
supersymmetric AdS$_5$ black hole is studied. The equations of motion are
derived and solved in terms of the Weierstrass $\wp$, $\sigma$ and $\zeta$
functions. Effective potentials and parametric diagrams are used to analyze and
characterize ... | [
{
"created": "Thu, 13 Feb 2020 12:42:09 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jun 2020 11:27:27 GMT",
"version": "v2"
}
] | 2020-06-29 | [
[
"Drawer",
"Jens-Christian",
""
],
[
"Grunau",
"Saskia",
""
]
] | In this article the geodesic motion of test particles in the spacetime of a supersymmetric AdS$_5$ black hole is studied. The equations of motion are derived and solved in terms of the Weierstrass $\wp$, $\sigma$ and $\zeta$ functions. Effective potentials and parametric diagrams are used to analyze and characterize ti... |
gr-qc/0506081 | Mamdouh Wanas | M.I.Wanas | Quantum Roots in Geometry: I | 20 pages, 1 figure, talk at XXV-International Workshop on Fundamental
Problems of High Energy Physics and Field Theory, held 25-28 June 2002,
Protvino, Russia | Published in the proceedings of the above mentioned conference
entitled "Geometrical and Topological Ideas in Modern Physics", (2003) p.
315-331 | null | null | gr-qc | null | In the present work, it is shown that the geometerization philosophy has not
been exhausted. Some quantum roots are already built in non-symmetric
geometries. Path equations in such geometries give rise to spin-gravity
interaction. Some experimental evidences (the results of the COW-experiment)
indicate the existence... | [
{
"created": "Tue, 14 Jun 2005 13:29:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wanas",
"M. I.",
""
]
] | In the present work, it is shown that the geometerization philosophy has not been exhausted. Some quantum roots are already built in non-symmetric geometries. Path equations in such geometries give rise to spin-gravity interaction. Some experimental evidences (the results of the COW-experiment) indicate the existence o... |
1506.04056 | Vassilios Mewes | Vassilios Mewes, Jos\'e A. Font, Filippo Galeazzi, Pedro J. Montero,
Nikolaos Stergioulas | Numerical relativity simulations of thick accretion disks around tilted
Kerr black holes | 35 pages, 33 figures, accepted for publication in PRD | Phys. Rev. D 93, 064055 (2016) | 10.1103/PhysRevD.93.064055 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present 3D numerical relativity simulations of thick
accretion disks around tilted Kerr BH. We investigate the evolution of three
different initial disk models with a range of initial black hole spin
magnitudes and tilt angles. For all the disk-to-black hole mass ratios
considered (0.044-0.16) we obse... | [
{
"created": "Fri, 12 Jun 2015 16:06:46 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Feb 2016 11:27:41 GMT",
"version": "v2"
}
] | 2016-07-20 | [
[
"Mewes",
"Vassilios",
""
],
[
"Font",
"José A.",
""
],
[
"Galeazzi",
"Filippo",
""
],
[
"Montero",
"Pedro J.",
""
],
[
"Stergioulas",
"Nikolaos",
""
]
] | In this work we present 3D numerical relativity simulations of thick accretion disks around tilted Kerr BH. We investigate the evolution of three different initial disk models with a range of initial black hole spin magnitudes and tilt angles. For all the disk-to-black hole mass ratios considered (0.044-0.16) we observ... |
1801.01993 | Rajibul Shaikh | Rajibul Shaikh, Pankaj S. Joshi (TIFR Mumbai, India) | Gravitational collapse in $(2+1)$-dimensional Eddington-inspired
Born-Infeld gravity | 16 pages, 3 figures, revised version, published in Phys. Rev. D | Phys. Rev. D 98, 024033 (2018) | 10.1103/PhysRevD.98.024033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study here the gravitational collapse of dust in $(2+1)$-dimensional
spacetimes for the formation of black holes (BH) and naked singularities (NS)
as final states in a modified theory of gravity, with vanishing cosmological
constant. From the perspective of cosmic censorship, we investigate the
collapse of a dust ... | [
{
"created": "Sat, 6 Jan 2018 09:36:06 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2018 15:22:16 GMT",
"version": "v2"
}
] | 2018-07-31 | [
[
"Shaikh",
"Rajibul",
"",
"TIFR Mumbai, India"
],
[
"Joshi",
"Pankaj S.",
"",
"TIFR Mumbai, India"
]
] | We study here the gravitational collapse of dust in $(2+1)$-dimensional spacetimes for the formation of black holes (BH) and naked singularities (NS) as final states in a modified theory of gravity, with vanishing cosmological constant. From the perspective of cosmic censorship, we investigate the collapse of a dust cl... |
1807.06047 | Aurelien Barrau | Aur\'elien Barrau, Pierre Jamet, Killian Martineau, Flora Moulin | Scalar spectra of primordial perturbations in loop quantum cosmology | null | Phys. Rev. D 98, 086003 (2018) | 10.1103/PhysRevD.98.086003 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article is devoted to the study of scalar perturbations in loop quantum
cosmology. It aims at clarifying the situation with respect to the way initial
conditions are set and to the specific choice of an inflaton potential. Several
monomial potentials are studied. Both the dressed metric and deformed algebra
appr... | [
{
"created": "Mon, 16 Jul 2018 18:20:40 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2018 08:12:51 GMT",
"version": "v2"
}
] | 2018-10-10 | [
[
"Barrau",
"Aurélien",
""
],
[
"Jamet",
"Pierre",
""
],
[
"Martineau",
"Killian",
""
],
[
"Moulin",
"Flora",
""
]
] | This article is devoted to the study of scalar perturbations in loop quantum cosmology. It aims at clarifying the situation with respect to the way initial conditions are set and to the specific choice of an inflaton potential. Several monomial potentials are studied. Both the dressed metric and deformed algebra approa... |
1407.1716 | Willians Barreto | W. Barreto (ULA) | Extended two-dimensional characteristic framework to study nonrotating
black holes | 13 pages, 11 figures; to appear in Physical Review D. arXiv admin
note: text overlap with arXiv:0711.0564 | Physical Review D 90, 024055 (2014) | 10.1103/PhysRevD.90.024055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a numerical solver, that extends the computational framework
considered in [Phys. Rev. D 65, 084016 (2002)], to include scalar perturbations
of nonrotating black holes. The nonlinear Einstein-Klein-Gordon equations for a
massless scalar field minimally coupled to gravity are solved in two spatial
dimension... | [
{
"created": "Mon, 7 Jul 2014 13:56:16 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Barreto",
"W.",
"",
"ULA"
]
] | We develop a numerical solver, that extends the computational framework considered in [Phys. Rev. D 65, 084016 (2002)], to include scalar perturbations of nonrotating black holes. The nonlinear Einstein-Klein-Gordon equations for a massless scalar field minimally coupled to gravity are solved in two spatial dimensions ... |
1908.07505 | Henk Bart | Henk Bart | Gravitational memory in the bulk | null | null | 10.1007/JHEP05(2020)106 | MPP-2019-180 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method for detecting gravitational memory is proposed. It makes use of
ingoing null geodesics instead of timelike geodesics in the original
formulation by Christodoulou. It is argued that the method is applicable in the
bulk of a spacetime. In addition, it is shown that BMS symmetry generators in
Newman-Unti gauge ... | [
{
"created": "Tue, 20 Aug 2019 17:28:45 GMT",
"version": "v1"
}
] | 2020-05-26 | [
[
"Bart",
"Henk",
""
]
] | A method for detecting gravitational memory is proposed. It makes use of ingoing null geodesics instead of timelike geodesics in the original formulation by Christodoulou. It is argued that the method is applicable in the bulk of a spacetime. In addition, it is shown that BMS symmetry generators in Newman-Unti gauge ha... |
0706.1057 | Martin Bojowald | Martin Bojowald, Hector Hernandez, Aureliano Skirzewski | Effective equations for isotropic quantum cosmology including matter | 42 pages | Phys.Rev.D76:063511,2007 | 10.1103/PhysRevD.76.063511 | IGPG-07/6-2 | gr-qc astro-ph hep-th | null | Effective equations often provide powerful tools to develop a systematic
understanding of detailed properties of a quantum system. This is especially
helpful in quantum cosmology where several conceptual and technical
difficulties associated with the full quantum equations can be avoided in this
way. Here, effective ... | [
{
"created": "Thu, 7 Jun 2007 18:58:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bojowald",
"Martin",
""
],
[
"Hernandez",
"Hector",
""
],
[
"Skirzewski",
"Aureliano",
""
]
] | Effective equations often provide powerful tools to develop a systematic understanding of detailed properties of a quantum system. This is especially helpful in quantum cosmology where several conceptual and technical difficulties associated with the full quantum equations can be avoided in this way. Here, effective eq... |
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