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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1005.3666 | Paulo Vargas Moniz | Carlos Marques Afonso, Alfredo Barbosa Henriques, Paulo Vargas Moniz | A note on testing pre-inflationary times with gravitational-waves | 10 pages, 2 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple inflationary model based on loop quantum cosmology is considered.
Within this framework, we show that inflation does not necessarily erase the
infor- mation prior to its onset, but that such information may leave its
imprint in the energy-spectrum of the gravitational-waves generated at these
earliest of tim... | [
{
"created": "Thu, 20 May 2010 11:35:25 GMT",
"version": "v1"
}
] | 2010-05-21 | [
[
"Afonso",
"Carlos Marques",
""
],
[
"Henriques",
"Alfredo Barbosa",
""
],
[
"Moniz",
"Paulo Vargas",
""
]
] | A simple inflationary model based on loop quantum cosmology is considered. Within this framework, we show that inflation does not necessarily erase the infor- mation prior to its onset, but that such information may leave its imprint in the energy-spectrum of the gravitational-waves generated at these earliest of times... |
1904.01060 | Nelson V Nunes | N. V. Nunes (1), N. Bartel (1), M. F. Bietenholz (1 and 2), M. V.
Zakhvatkin (3), D. A. Litvinov (4, 5 and 6), V. N. Rudenko (4), L. I. Gurvits
(7 and 8), G. Granato (8), D. Dirkx (8) ((1) York University, (2) South
African Radio Astronomy Observatory, (3) Keldysh Institute for Applied
Mathematics, (4) Sternber... | The gravitational redshift monitored with RadioAstron from near Earth up
to 350,000 km | 16 pages, 6 figures, accepted for publication in Advances in Space
Research. arXiv admin note: text overlap with arXiv:1710.10074 | null | 10.1016/j.asr.2019.03.012 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on our efforts to test the Einstein Equivalence Principle by
measuring the gravitational redshift with the VLBI spacecraft RadioAstron, in
an eccentric orbit around Earth with geocentric distances as small as $\sim$
7,000 km and up to 350,000 km. The spacecraft and its ground stations are each
equipped with... | [
{
"created": "Mon, 1 Apr 2019 18:35:28 GMT",
"version": "v1"
}
] | 2019-04-03 | [
[
"Nunes",
"N. V.",
"",
"1 and 2"
],
[
"Bartel",
"N.",
"",
"1 and 2"
],
[
"Bietenholz",
"M. F.",
"",
"1 and 2"
],
[
"Zakhvatkin",
"M. V.",
"",
"4, 5 and 6"
],
[
"Litvinov",
"D. A.",
"",
"4, 5 and 6"
],
[
"Rudenko... | We report on our efforts to test the Einstein Equivalence Principle by measuring the gravitational redshift with the VLBI spacecraft RadioAstron, in an eccentric orbit around Earth with geocentric distances as small as $\sim$ 7,000 km and up to 350,000 km. The spacecraft and its ground stations are each equipped with s... |
gr-qc/9606064 | Jose Ademir Sales de Lima | L. R. W. Abramo (Brown University, Providence, RI, USA) and J. A. S.
Lima (Brown University, Providence, RI, USA and Universidade Federal do Rio
grande do Norte, Natal, RN, Brazil) | Inflationary Models Driven by Adiabatic Matter Creation | 25 pages, 2 figures(available from the authors), uses LATEX | Class.Quant.Grav. 13 (1996) 2953-2964 | 10.1088/0264-9381/13/11/011 | Brown-HET-1009 | gr-qc | null | The flat inflationary dust universe with matter creation proposed by
Prigogine and coworkers is generalized and its dynamical properties are
reexamined. It is shown that the starting point of these models depends
critically on a dimensionless parameter $\Sigma$, closely related to the matter
creation rate $\psi$. For... | [
{
"created": "Fri, 21 Jun 1996 04:18:17 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Abramo",
"L. R. W.",
"",
"Brown University, Providence, RI, USA"
],
[
"Lima",
"J. A. S.",
"",
"Brown University, Providence, RI, USA and Universidade Federal do Rio\n grande do Norte, Natal, RN, Brazil"
]
] | The flat inflationary dust universe with matter creation proposed by Prigogine and coworkers is generalized and its dynamical properties are reexamined. It is shown that the starting point of these models depends critically on a dimensionless parameter $\Sigma$, closely related to the matter creation rate $\psi$. For $... |
2312.06692 | Qingdi Wang | Qingdi Wang | Extra Attraction Generated by Spacetime Fluctuations | 29 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, due to the nonlinear nature of gravity, fluctuations in
spacetime curvature generate additional gravitational attraction. This
fluctuation-induced extra attraction was overlooked in the conventional
understanding of the cosmological constant problem. If the quantum vacuum of
matter fields possesses posi... | [
{
"created": "Sat, 9 Dec 2023 15:13:06 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jan 2024 10:20:10 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jan 2024 18:13:23 GMT",
"version": "v3"
}
] | 2024-01-09 | [
[
"Wang",
"Qingdi",
""
]
] | We show that, due to the nonlinear nature of gravity, fluctuations in spacetime curvature generate additional gravitational attraction. This fluctuation-induced extra attraction was overlooked in the conventional understanding of the cosmological constant problem. If the quantum vacuum of matter fields possesses positi... |
1612.08744 | Alan Kostelecky | Joshua Foster, Alan Kostelecky, Rui Xu | Constraints on Nonmetricity from Bounds on Lorentz Violation | 13 pages | Phys. Rev. D 95, 084033 (2017) | 10.1103/PhysRevD.95.084033 | IUHET 623, December 2016 | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spacetime nonmetricity can be studied experimentally through its couplings to
fermions and photons. We use recent high-precision searches for Lorentz
violation to deduce first constraints involving the 40 independent nonmetricity
components down to levels of order $10^{-43}$ GeV.
| [
{
"created": "Tue, 27 Dec 2016 21:00:00 GMT",
"version": "v1"
}
] | 2017-04-24 | [
[
"Foster",
"Joshua",
""
],
[
"Kostelecky",
"Alan",
""
],
[
"Xu",
"Rui",
""
]
] | Spacetime nonmetricity can be studied experimentally through its couplings to fermions and photons. We use recent high-precision searches for Lorentz violation to deduce first constraints involving the 40 independent nonmetricity components down to levels of order $10^{-43}$ GeV. |
gr-qc/0003041 | Maria Emilia | S. R. M. Masalskiene (Depto. de Matematica, UnB) and M. E. X.
Guimaraes (Depto. de Matematica, UnB) | Cosmic String Wakes in Scalar-Tensor Gravities | Replaced version to be published in the Classical and Quantum Gravity | Class.Quant.Grav. 17 (2000) 3055 | 10.1088/0264-9381/17/15/313 | null | gr-qc astro-ph | null | The formation and evolution of cosmic string wakes in the framework of a
scalar-tensor gravity are investigated in this work. We consider a simple model
in which cold dark matter flows past an ordinary string and we treat this
motion in the Zel'dovich approximation. We make a comaprison between our
results and previo... | [
{
"created": "Thu, 9 Mar 2000 17:29:51 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jun 2000 17:03:50 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Masalskiene",
"S. R. M.",
"",
"Depto. de Matematica, UnB"
],
[
"Guimaraes",
"M. E. X.",
"",
"Depto. de Matematica, UnB"
]
] | The formation and evolution of cosmic string wakes in the framework of a scalar-tensor gravity are investigated in this work. We consider a simple model in which cold dark matter flows past an ordinary string and we treat this motion in the Zel'dovich approximation. We make a comaprison between our results and previous... |
gr-qc/0703131 | Didier Solis | Gregory J. Galloway and Didier A. Solis | Uniqueness of de Sitter space | 22 pages, 2 figures | Class.Quant.Grav.24:3125-3138,2007 | 10.1088/0264-9381/24/11/021 | null | gr-qc hep-th math.DG | null | All inextendible null geodesics in four dimensional de Sitter space dS^4 are
complete and globally achronal. This achronality is related to the fact that
all observer horizons in dS^4 are eternal, i.e. extend from future infinity
scri^+ all the way back to past infinity scri^-. We show that the property of
having a n... | [
{
"created": "Tue, 27 Mar 2007 17:53:15 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Galloway",
"Gregory J.",
""
],
[
"Solis",
"Didier A.",
""
]
] | All inextendible null geodesics in four dimensional de Sitter space dS^4 are complete and globally achronal. This achronality is related to the fact that all observer horizons in dS^4 are eternal, i.e. extend from future infinity scri^+ all the way back to past infinity scri^-. We show that the property of having a nul... |
gr-qc/9803012 | Friedrich W. Hehl | A. Garcia, F.W. Hehl, C. Laemmerzahl, A. Macias, J. Soccorro | Pleba\'nski-Demia\'nski-like solutions in metric-affine gravity | 12 pages of a LaTeX-file | Class.Quant.Grav. 15 (1998) 1793-1799 | 10.1088/0264-9381/15/6/025 | Cologne-ThP-He1-Nov97 | gr-qc | null | We consider a (non--Riemannian) metric--affine gravity theory, in particular
its nonmetricity--torsion sector ``isomorphic'' to the Einstein--Maxwell
theory. We map certain Einstein--Maxwell electrovacuum solutions to it, namely
the Pleba\'nski--Demia\'nski class of Petrov type D metrics.
| [
{
"created": "Tue, 3 Mar 1998 20:57:29 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Garcia",
"A.",
""
],
[
"Hehl",
"F. W.",
""
],
[
"Laemmerzahl",
"C.",
""
],
[
"Macias",
"A.",
""
],
[
"Soccorro",
"J.",
""
]
] | We consider a (non--Riemannian) metric--affine gravity theory, in particular its nonmetricity--torsion sector ``isomorphic'' to the Einstein--Maxwell theory. We map certain Einstein--Maxwell electrovacuum solutions to it, namely the Pleba\'nski--Demia\'nski class of Petrov type D metrics. |
2301.00684 | Vladimir Karas | Vladimir Karas | Astrophysical black holes embedded in organized magnetic fields: Case of
a nonvanishing electric charge | 7 pages, 1 figure, in the Proceedings of RAGtime Conference, eds. Z.
Stuchlik et al. (2023, Opava, Czech Republic), ISBN 978-80-7510-576-9
(Print), ISBN 978-80-7510-577-6 (Online), pp. 13-19 | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Large scale magnetic fields pervade the cosmic environment where the
astrophysical black holes are often embedded and influenced by the mutual
interaction. In this contribution we outline the appropriate mathematical
framework to describe magnetized black holes within General Relativity and we
show several examples h... | [
{
"created": "Tue, 27 Dec 2022 13:55:21 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Dec 2023 20:52:47 GMT",
"version": "v2"
}
] | 2024-01-02 | [
[
"Karas",
"Vladimir",
""
]
] | Large scale magnetic fields pervade the cosmic environment where the astrophysical black holes are often embedded and influenced by the mutual interaction. In this contribution we outline the appropriate mathematical framework to describe magnetized black holes within General Relativity and we show several examples how... |
gr-qc/9805093 | Trinidad Ramirez Trejo | B. Mashhoon, J.C. McClune, and H. Quevedo | The gravitoelectromagnetic stress-energy tensor | 16 pages, Latex, 1 figure (not included) | Class.Quant.Grav. 16 (1999) 1137-1148 | 10.1088/0264-9381/16/4/004 | null | gr-qc | null | We study the pseudo-local gravitoelectromagnetic stress-energy tensor for an
arbitrary gravitational field within the framework of general relativity. It is
shown that there exists a current of gravitational energy around a rotating
mass. This gravitational analog of the Poynting flux is evaluated for certain
classes... | [
{
"created": "Wed, 27 May 1998 00:45:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mashhoon",
"B.",
""
],
[
"McClune",
"J. C.",
""
],
[
"Quevedo",
"H.",
""
]
] | We study the pseudo-local gravitoelectromagnetic stress-energy tensor for an arbitrary gravitational field within the framework of general relativity. It is shown that there exists a current of gravitational energy around a rotating mass. This gravitational analog of the Poynting flux is evaluated for certain classes o... |
2107.04862 | Jen-Tsung Hsiang | Jen-Tsung Hsiang and Bei-Lok Hu | Dynamical Response of an Unruh-DeWitt Detector in a Quantum Field over
the History of the Universe | 36 pages, 1 figure. v2: This paper is published in Ann. Phys. (NY)
doi.org/10.1016/j.aop.2021.168656 under the title "NonMarkovianity in
cosmology: Memories kept in a quantum field" | Ann. Phys. 434, 168656 (2021) | 10.1016/j.aop.2021.168656 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we ask how an Unruh-DeWitt (UD) detector with harmonic
oscillator internal degrees of freedom $Q$ measuring an evolving quantum matter
field $\Phi(\bm{x}, t)$ in an expanding universe with scale factor $a(t)$
responds. We investigate the detector's response which contains non-Markovian
information about ... | [
{
"created": "Sat, 10 Jul 2021 15:36:53 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jan 2022 03:32:44 GMT",
"version": "v2"
}
] | 2022-01-11 | [
[
"Hsiang",
"Jen-Tsung",
""
],
[
"Hu",
"Bei-Lok",
""
]
] | In this work we ask how an Unruh-DeWitt (UD) detector with harmonic oscillator internal degrees of freedom $Q$ measuring an evolving quantum matter field $\Phi(\bm{x}, t)$ in an expanding universe with scale factor $a(t)$ responds. We investigate the detector's response which contains non-Markovian information about th... |
0711.4188 | Subenoy Chakraborty | Asit Banerjee, Tanwi Bandyopadhyay and Subenoy Chakraborty | Emergent Universe in Brane World Scenario with Schwarzschild-de Sitter
Bulk | 4 pages, no figure, accepted for publication in Gen.Relt.Grav | Gen.Rel.Grav.40:1603-1607,2008 | 10.1007/s10714-007-0567-3 | null | gr-qc | null | A model of an emergent universe is obtained in brane world. Here the bulk
energy is in the form of cosmological constant, while the brane consists of a
fluid satisfying an equation of state of the form $p_{b}={1/3} \rho_{b}$, which
is effectively a radiation equation of state at high energies. It is shown that
with t... | [
{
"created": "Tue, 27 Nov 2007 06:51:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Banerjee",
"Asit",
""
],
[
"Bandyopadhyay",
"Tanwi",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | A model of an emergent universe is obtained in brane world. Here the bulk energy is in the form of cosmological constant, while the brane consists of a fluid satisfying an equation of state of the form $p_{b}={1/3} \rho_{b}$, which is effectively a radiation equation of state at high energies. It is shown that with the... |
gr-qc/0307106 | Dario Grasso | Dario Grasso | Graviton Production by a Thermal Bath | 5 pages. To appear on the proceedings of the 28th International
Cosmic Rays Conference | null | null | null | gr-qc | null | Thermal fluctuations in the early universe plasma and in very hot
astrophysical objects are an unavoidable source of gravitational waves (GW).
Differently from previous studies on the subject, we approach this problem
using methods based on field theory at finite temperature. Such an approach
allows to probe the infr... | [
{
"created": "Thu, 24 Jul 2003 09:50:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grasso",
"Dario",
""
]
] | Thermal fluctuations in the early universe plasma and in very hot astrophysical objects are an unavoidable source of gravitational waves (GW). Differently from previous studies on the subject, we approach this problem using methods based on field theory at finite temperature. Such an approach allows to probe the infrar... |
2104.10290 | Florian Beyer | Florian Beyer and Joshua Ritchie | Asymptotically hyperboloidal initial data sets from a
parabolic-hyperbolic formulation of the Einstein vacuum constraints | Only minor changes. Matches the published version | 2022 Class. Quantum Grav. 39 145012 | 10.1088/1361-6382/ac79f1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we continue our investigations of R\'acz's
parabolic-hyperbolic formulation of the Einstein vacuum constraints. Our
previous studies of the asymptotically flat setting provided strong evidence
for unstable asymptotics which we were able to resolve by introducing a certain
modification of R\'acz's parab... | [
{
"created": "Wed, 21 Apr 2021 00:30:57 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2022 01:40:58 GMT",
"version": "v2"
}
] | 2022-07-14 | [
[
"Beyer",
"Florian",
""
],
[
"Ritchie",
"Joshua",
""
]
] | In this paper, we continue our investigations of R\'acz's parabolic-hyperbolic formulation of the Einstein vacuum constraints. Our previous studies of the asymptotically flat setting provided strong evidence for unstable asymptotics which we were able to resolve by introducing a certain modification of R\'acz's parabol... |
1303.4070 | Ian Hawke | I. Hawke, G. L. Comer, N. Andersson | The nonlinear development of the relativistic two-stream instability | 15 pages, 9 figures | null | 10.1088/0264-9381/30/14/145007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-stream instability has been mooted as an explanation for a range of
astrophysical applications from GRBs and pulsar glitches to cosmology. Using
the first nonlinear numerical simulations of relativistic multi-species
hydrodynamics we show that the onset and initial growth of the instability is
very well descr... | [
{
"created": "Sun, 17 Mar 2013 15:30:51 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Hawke",
"I.",
""
],
[
"Comer",
"G. L.",
""
],
[
"Andersson",
"N.",
""
]
] | The two-stream instability has been mooted as an explanation for a range of astrophysical applications from GRBs and pulsar glitches to cosmology. Using the first nonlinear numerical simulations of relativistic multi-species hydrodynamics we show that the onset and initial growth of the instability is very well describ... |
gr-qc/0610067 | Rafael Ferraro | Rafael Ferraro, Franco Fiorini | Modified teleparallel gravity: inflation without inflaton | 4 pages, 2 figures. Version to be published in Physical Review D | Phys.Rev.D75:084031,2007 | 10.1103/PhysRevD.75.084031 | null | gr-qc astro-ph hep-th | null | Born-Infeld strategy to smooth theories having divergent solutions is applied
to teleparallel equivalent of General Relativity. Differing from other theories
of modified gravity, modified teleparallelism leads to second order equations,
since teleparallel Lagrangian only contains first derivatives of the vierbein.
We... | [
{
"created": "Thu, 12 Oct 2006 20:27:38 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Mar 2007 17:14:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ferraro",
"Rafael",
""
],
[
"Fiorini",
"Franco",
""
]
] | Born-Infeld strategy to smooth theories having divergent solutions is applied to teleparallel equivalent of General Relativity. Differing from other theories of modified gravity, modified teleparallelism leads to second order equations, since teleparallel Lagrangian only contains first derivatives of the vierbein. We s... |
1406.6194 | Eric Larsson | Eric Larsson | Smoothness of compact horizons | This is chapter one of arXiv:1406.6194v1, rewritten and improved | Ann. Henri Poincar\'e 16 (2015), no. 9, 2163-2214 | 10.1007/s00023-014-0371-z | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that compact Cauchy horizons in a smooth spacetime satisfying the
null energy condition are smooth. As an application, we consider the problem of
determining when a cobordism admits Lorentzian metrics with certain properties.
In particular, we prove a result originally due to Tipler without the
smoothness hy... | [
{
"created": "Tue, 24 Jun 2014 10:32:02 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2017 13:40:29 GMT",
"version": "v2"
}
] | 2017-01-25 | [
[
"Larsson",
"Eric",
""
]
] | We prove that compact Cauchy horizons in a smooth spacetime satisfying the null energy condition are smooth. As an application, we consider the problem of determining when a cobordism admits Lorentzian metrics with certain properties. In particular, we prove a result originally due to Tipler without the smoothness hypo... |
1807.03687 | Ludovic Ducobu | Y.Brihaye, L.Ducobu | Spinning-Charged-Hairy Black Holes in 5-d Einstein gravity | 12 pages, 5 figures. Results extended. References added | Phys. Rev. D 98, 064034 (2018) | 10.1103/PhysRevD.98.064034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spinning-hairy black holes that occur in Einstein gravity supplemented by
a doublet of complex scalar fields are constructed within an extension of the
model by a $U(1)$ gauge symmetry involving a massless vector potential. The
hairy black holes then acquire an electric charge and a magnetic moment; their
domain ... | [
{
"created": "Tue, 10 Jul 2018 14:50:10 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2018 12:56:02 GMT",
"version": "v2"
}
] | 2018-12-19 | [
[
"Brihaye",
"Y.",
""
],
[
"Ducobu",
"L.",
""
]
] | The spinning-hairy black holes that occur in Einstein gravity supplemented by a doublet of complex scalar fields are constructed within an extension of the model by a $U(1)$ gauge symmetry involving a massless vector potential. The hairy black holes then acquire an electric charge and a magnetic moment; their domain of... |
1708.08849 | Ion Vasile Vancea | Ion V. Vancea | On the existence of the field line solutions of the Einstein-Maxwell
equations | Misprints corrected. To be published in IJGMM | null | 10.1142/S0219887818500548 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main result of this paper is the proof that there are local electric and
magnetic field configurations expressed in terms of field lines on an arbitrary
hyperbolic manifold. This electromagnetic field is described by (dual)
solutions of the Maxwell's equations of the Einstein-Maxwell theory. These
solutions have ... | [
{
"created": "Tue, 29 Aug 2017 16:04:29 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2017 19:56:56 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Sep 2017 11:04:28 GMT",
"version": "v3"
},
{
"created": "Mon, 4 Dec 2017 21:58:11 GMT",
"version": "v4"
}
] | 2017-12-06 | [
[
"Vancea",
"Ion V.",
""
]
] | The main result of this paper is the proof that there are local electric and magnetic field configurations expressed in terms of field lines on an arbitrary hyperbolic manifold. This electromagnetic field is described by (dual) solutions of the Maxwell's equations of the Einstein-Maxwell theory. These solutions have th... |
gr-qc/0009056 | Paulo Aguiar | Paulo Aguiar and Paulo Crawford | Dust-filled axially symmetric universes with a cosmological constant | 12 pages, 9 figures, 1 table. Published in Physical Review D 15 | Phys.Rev.D62:123511,2000 | 10.1103/PhysRevD.62.123511 | null | gr-qc | null | Following the recent recognition of a positive value for the vacuum energy
density and the realization that a simple Kantowski-Sachs model might fit the
classical tests of cosmology, we study the qualitative behavior of three
anisotropic and homogeneous models: Kantowski-Sachs, Bianchi type-I and Bianchi
type-III uni... | [
{
"created": "Fri, 15 Sep 2000 16:06:14 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2001 03:06:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Aguiar",
"Paulo",
""
],
[
"Crawford",
"Paulo",
""
]
] | Following the recent recognition of a positive value for the vacuum energy density and the realization that a simple Kantowski-Sachs model might fit the classical tests of cosmology, we study the qualitative behavior of three anisotropic and homogeneous models: Kantowski-Sachs, Bianchi type-I and Bianchi type-III unive... |
1112.5812 | Alexandre Baranov | Alexandre M.Baranov and Alexander Yu.Osipov | The Relativistic Fluid Ball as a Stratified Model of an Astrophysical
Object | 3 pages, 2 figures, Talk given at the International Conference
RUDN-10, June 28-July 3, 2010, PFUR, Moscow | Gravitation & Cosmology, 2011, Vol.17, No.2, pp.173-175 | 10.1134/S020228931102006x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A relativistic fluid ball with an inhomogeneous static stratified matter
configuration is considered. A model of an astrophysical object with this
structure of matter is constructed.
| [
{
"created": "Mon, 26 Dec 2011 05:35:14 GMT",
"version": "v1"
}
] | 2011-12-30 | [
[
"Baranov",
"Alexandre M.",
""
],
[
"Osipov",
"Alexander Yu.",
""
]
] | A relativistic fluid ball with an inhomogeneous static stratified matter configuration is considered. A model of an astrophysical object with this structure of matter is constructed. |
1911.03172 | Andrei Erofeev | Andrei L. Erofeev | On dynamic aspects of the Proca field screening by a black hole | 19 pages, 4 figures | null | 10.1140/epjc/s10052-020-8044-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classical black holes are known for almost half a century to nullify exterior
classical massive vector field associated with a charge crossing the event
horizon. This implies that, from the point of view of an external observer, the
Proca field of the charge is screened with the strength gradually increasing as
the c... | [
{
"created": "Fri, 8 Nov 2019 10:35:47 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Nov 2019 10:54:04 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Erofeev",
"Andrei L.",
""
]
] | Classical black holes are known for almost half a century to nullify exterior classical massive vector field associated with a charge crossing the event horizon. This implies that, from the point of view of an external observer, the Proca field of the charge is screened with the strength gradually increasing as the cha... |
1706.08010 | Faramarz Rahmani | Faramarz Rahmani and Mehdi Golshani | Some clarifications about the Bohmian geodesic deviation equation and
Raychaudhuri's equation | null | null | 10.1142/S0217751X18500276 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the important and famous topics in general theory of relativity and
gravitation is the problem of geodesic deviation and its related singularity
theorems. An interesting subject is the investigation of these concepts when
quantum effects are considered. Since, the definition of trajectory is not
possible in th... | [
{
"created": "Sat, 24 Jun 2017 22:48:50 GMT",
"version": "v1"
}
] | 2018-02-28 | [
[
"Rahmani",
"Faramarz",
""
],
[
"Golshani",
"Mehdi",
""
]
] | One of the important and famous topics in general theory of relativity and gravitation is the problem of geodesic deviation and its related singularity theorems. An interesting subject is the investigation of these concepts when quantum effects are considered. Since, the definition of trajectory is not possible in the ... |
gr-qc/9607036 | null | S. Demelio and S. Mignemi | Multi-black holes and instantons in effective string theory | 10 pages, plain TeX | Int.J.Mod.Phys. D7 (1998) 73-80 | 10.1142/S0218271898000073 | INFNCA-TH611 | gr-qc | null | The effective action for string theory which takes into account non-minimal
coupling of moduli admits multi-black hole solutions. The euclidean
continuation of these solutions can be interpreted as an instanton mediating
the splitting and recombination of the throat of extremal magnetically charged
black holes.
| [
{
"created": "Tue, 16 Jul 1996 19:23:35 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Demelio",
"S.",
""
],
[
"Mignemi",
"S.",
""
]
] | The effective action for string theory which takes into account non-minimal coupling of moduli admits multi-black hole solutions. The euclidean continuation of these solutions can be interpreted as an instanton mediating the splitting and recombination of the throat of extremal magnetically charged black holes. |
1909.08915 | Jo\~ao M. Oliveira | Carlos A. R. Herdeiro, Jo\~ao M. S. Oliveira | On the inexistence of self-gravitating solitons in generalised axion
electrodynamics | 10 pages, no figures | null | 10.1016/j.physletb.2019.135076 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building upon the methods used recently, we establish the inexistence of
self-gravitating solitonic solutions for both static and strictly stationary
asymptotically flat spacetimes in generalised axion electrodynamics. This is an
Einstein-Maxwell-axion model, where the axion field $\theta$ is non-minimally
coupled to... | [
{
"created": "Thu, 19 Sep 2019 10:59:59 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Oliveira",
"João M. S.",
""
]
] | Building upon the methods used recently, we establish the inexistence of self-gravitating solitonic solutions for both static and strictly stationary asymptotically flat spacetimes in generalised axion electrodynamics. This is an Einstein-Maxwell-axion model, where the axion field $\theta$ is non-minimally coupled to t... |
gr-qc/0103097 | Serge Massar | R. Brout | Who is the Inflaton? | extensively revised version presented at the Corfu School and
Workshop of Theoretical Physics 2001 | null | null | ULB-TH/01-06 | gr-qc | null | In the context of the two-fluid model introduced to tame the transplanckian
problem of black hole physics, the inflaton field of the chaotic inflation
scenario is identified with the fluctuation of the density of modes. Its mass
comes about from the exchange of degrees of freedom between the two fluids.
| [
{
"created": "Tue, 27 Mar 2001 11:21:08 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Aug 2001 10:42:22 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Dec 2001 10:54:17 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Brout",
"R.",
""
]
] | In the context of the two-fluid model introduced to tame the transplanckian problem of black hole physics, the inflaton field of the chaotic inflation scenario is identified with the fluctuation of the density of modes. Its mass comes about from the exchange of degrees of freedom between the two fluids. |
1608.00685 | Miguel Campiglia | Miguel Campiglia, Alok Laddha | Sub-subleading soft gravitons and large diffeomorphisms | 41 pages | null | 10.1007/JHEP01(2017)036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present strong evidence that the sub-subleading soft theorem in
semi-classical (tree level) gravity discovered by Cachazo and Strominger is
equivalent to the conservation of asymptotic charges associated to a new class
of vector fields not contained within the previous extensions of BMS algebra.
Our analysis cruci... | [
{
"created": "Tue, 2 Aug 2016 02:52:55 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Campiglia",
"Miguel",
""
],
[
"Laddha",
"Alok",
""
]
] | We present strong evidence that the sub-subleading soft theorem in semi-classical (tree level) gravity discovered by Cachazo and Strominger is equivalent to the conservation of asymptotic charges associated to a new class of vector fields not contained within the previous extensions of BMS algebra. Our analysis crucial... |
gr-qc/0411063 | Kirill Bronnikov | K.A. Bronnikov, S.V. Grinyok | Conformal continuations and wormhole instability in scalar-tensor
gravity | 8 two-column pages, latex, gc style | Grav.Cosmol. 10 (2004) 237 | null | null | gr-qc | null | We study the stability of static, spherically symmetric, traversable
wormholes existing due to conformal continuations in a class of scalar-tensor
theories with zero scalar field potential (so that Fisher's well-known
scalar-vacuum solution holds in the Einstein conformal frame). Specific
examples of such wormholes a... | [
{
"created": "Fri, 12 Nov 2004 14:23:44 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Grinyok",
"S. V.",
""
]
] | We study the stability of static, spherically symmetric, traversable wormholes existing due to conformal continuations in a class of scalar-tensor theories with zero scalar field potential (so that Fisher's well-known scalar-vacuum solution holds in the Einstein conformal frame). Specific examples of such wormholes are... |
2307.12876 | Frans Klinkhamer | F.R. Klinkhamer | Higher-dimensional extension of a vacuum-defect wormhole | 11 pages, 2 figures, v3: appendix added on 4D interpolating metrics | null | null | KA-TP-15-2023 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a 5D metric which interpolates between the standard 4D
Schwarzschild metric with mass parameter $M$ and a new 4D $M$-deformed
vacuum-defect-wormhole metric. The 5D spacetime can, in principle, have an
infinite mass density that gives rise to the $M$ parameter of the 4D
$M$-deformed vacuum-defect wormhole. ... | [
{
"created": "Mon, 24 Jul 2023 15:16:44 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2023 17:23:43 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Aug 2023 14:40:26 GMT",
"version": "v3"
}
] | 2023-08-22 | [
[
"Klinkhamer",
"F. R.",
""
]
] | We present a 5D metric which interpolates between the standard 4D Schwarzschild metric with mass parameter $M$ and a new 4D $M$-deformed vacuum-defect-wormhole metric. The 5D spacetime can, in principle, have an infinite mass density that gives rise to the $M$ parameter of the 4D $M$-deformed vacuum-defect wormhole. Fo... |
gr-qc/9506085 | David Brown | David Brown | Black Hole Entropy and the Hamiltonian Formulation of Diffeomorphism
Invariant Theories | 26 pages, REVTeX | Phys.Rev. D52 (1995) 7011-7026 | 10.1103/PhysRevD.52.7011 | CTMP/011/NCSU | gr-qc hep-th | null | Path integral methods are used to derive a general expression for the entropy
of a black hole in a diffeomorphism invariant theory. The result, which depends
on the variational derivative of the Lagrangian with respect to the Riemann
tensor, agrees with the result obtained from Noether charge methods by Iyer and
Wald... | [
{
"created": "Fri, 30 Jun 1995 16:54:58 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Brown",
"David",
""
]
] | Path integral methods are used to derive a general expression for the entropy of a black hole in a diffeomorphism invariant theory. The result, which depends on the variational derivative of the Lagrangian with respect to the Riemann tensor, agrees with the result obtained from Noether charge methods by Iyer and Wald. ... |
gr-qc/0007058 | Mario La Camera | A. G. Agnese, M. La Camera | Black hole horizon and space-time foam | 8 pages, LateX2e | Nuovo Cim.B116:611-615,2001 | null | null | gr-qc | null | We introduce, by means of the Brans-Dicke scalar field, space-time
fluctuations at scale comparable to Planck length near the event horizon of a
black hole and examine their dramatic effects.
| [
{
"created": "Fri, 21 Jul 2000 16:28:27 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Agnese",
"A. G.",
""
],
[
"La Camera",
"M.",
""
]
] | We introduce, by means of the Brans-Dicke scalar field, space-time fluctuations at scale comparable to Planck length near the event horizon of a black hole and examine their dramatic effects. |
2401.02260 | Ran Li | Ran Li, Conghua Liu, Jin Wang | Phase space path integral approach to the kinetics of black hole phase
transition | More discussions on generalized free energy from York's approach and
phase portrait at the critical point, and a brief review of time-dependent
Ginzburg-Landau model are added | null | null | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ the approach of path integral in the phase space to study the
kinetics of state switching associated with black hole phase transitions. Under
the assumption that the state switching process of the black hole is described
by the stochastic Langevin equation based on the free energy landscape, we
derived the ... | [
{
"created": "Thu, 4 Jan 2024 13:27:13 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jan 2024 13:01:06 GMT",
"version": "v2"
},
{
"created": "Mon, 6 May 2024 12:41:04 GMT",
"version": "v3"
},
{
"created": "Tue, 7 May 2024 02:19:05 GMT",
"version": "v4"
}
] | 2024-05-08 | [
[
"Li",
"Ran",
""
],
[
"Liu",
"Conghua",
""
],
[
"Wang",
"Jin",
""
]
] | We employ the approach of path integral in the phase space to study the kinetics of state switching associated with black hole phase transitions. Under the assumption that the state switching process of the black hole is described by the stochastic Langevin equation based on the free energy landscape, we derived the Ma... |
1703.07440 | Anatoly Svidzinsky | Anatoly Svidzinsky | Testing Vector Gravity with Gravitational Wave Interferometers | 4 pages, 2 figures | Published as Section 16 in Physica Scripta 92, 125001 (2017) | 10.1088/1402-4896/aa93a8 | null | gr-qc astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the author proposed an alternative vector theory of gravity. To the
best of our knowledge, vector gravity also passes available tests of gravity,
and, in addition, predicts the correct value of the cosmological constant
without free parameters. It is important to find a new feasible test which can
distingui... | [
{
"created": "Tue, 21 Mar 2017 21:40:19 GMT",
"version": "v1"
}
] | 2017-11-21 | [
[
"Svidzinsky",
"Anatoly",
""
]
] | Recently, the author proposed an alternative vector theory of gravity. To the best of our knowledge, vector gravity also passes available tests of gravity, and, in addition, predicts the correct value of the cosmological constant without free parameters. It is important to find a new feasible test which can distinguish... |
2104.08722 | Alberto Escalante | A. Escalante (Puebla U., Inst. Fis.) and Jorge Hern\'andez Aguilar
(FCFM, BUAP) | New canonical analysis for higher order topologically massive gravity | null | null | 10.1140/epjc/s10052-021-09429-6 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed Gitman-Lyakhovich-Tyutin analysis for higher-order topologically
massive gravity is performed. The full structure of the constraints, the
counting of physical degrees of freedom, and the Dirac algebra among the
constraints are reported. Moreover, our analysis presents a new structure of
the constraints and... | [
{
"created": "Sun, 18 Apr 2021 05:25:05 GMT",
"version": "v1"
},
{
"created": "Sun, 30 May 2021 21:55:46 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Jun 2021 16:42:59 GMT",
"version": "v3"
}
] | 2021-08-18 | [
[
"Escalante",
"A.",
"",
"Puebla U., Inst. Fis."
],
[
"Aguilar",
"Jorge Hernández",
"",
"FCFM, BUAP"
]
] | A detailed Gitman-Lyakhovich-Tyutin analysis for higher-order topologically massive gravity is performed. The full structure of the constraints, the counting of physical degrees of freedom, and the Dirac algebra among the constraints are reported. Moreover, our analysis presents a new structure of the constraints and w... |
0910.2498 | Roman Sverdlov | Roman Sverdlov | Causal set as a discretized phase spacetime | 50 pages, no figures | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first goal of this paper is to show that discreteness, locality, and
relativistic covariance can peacefully coexist if the ordinary spacetime (OST)
is replaced with phase spacetime (PST) as a geometric background of a Poisson
process, where PST is a spacetime generalization of a notion of phase space
(this is a 7... | [
{
"created": "Tue, 13 Oct 2009 23:54:06 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Nov 2009 18:25:35 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Apr 2010 03:24:54 GMT",
"version": "v3"
}
] | 2010-05-03 | [
[
"Sverdlov",
"Roman",
""
]
] | The first goal of this paper is to show that discreteness, locality, and relativistic covariance can peacefully coexist if the ordinary spacetime (OST) is replaced with phase spacetime (PST) as a geometric background of a Poisson process, where PST is a spacetime generalization of a notion of phase space (this is a 7-d... |
2310.08781 | Joel Saavedra | Joel Saavedra and Francisco Tello-Ortiz | Unified first law of thermodynamics in Gauss-Bonnet gravity on an FLRW
background | 10 pages, 2 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Employing the thermodynamic unified first law through the
thermodynamic-gravity conjecture, in this article, we derive for a FLRW
universe the Friedmann equations in the framework of Gauss-Bonnet gravity
theory. To do this, we project this generalized first law along the Kodama
vector field and along the direction of... | [
{
"created": "Fri, 13 Oct 2023 00:06:56 GMT",
"version": "v1"
}
] | 2023-10-16 | [
[
"Saavedra",
"Joel",
""
],
[
"Tello-Ortiz",
"Francisco",
""
]
] | Employing the thermodynamic unified first law through the thermodynamic-gravity conjecture, in this article, we derive for a FLRW universe the Friedmann equations in the framework of Gauss-Bonnet gravity theory. To do this, we project this generalized first law along the Kodama vector field and along the direction of a... |
1102.2720 | Jian-Yang Zhu | Yu Li and Jian-Yang Zhu | Application of higher order holonomy corrections to perturbation theory
of cosmology | 7 pages, 1 figures | Class.Quant.Grav.28:045007,2011 | 10.1088/0264-9381/28/4/045007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Applying the higher order holonomy corrections to the perturbation theory of
cosmology, the lattice power law of Loop Quantum Cosmology, $\tilde{\mu}\propto
p^{\beta}$, is analysed and the range of $\beta$ is decided to be [-1,0] which
is different from the conventional range $-0.1319>\beta\geq-5/2$ \cite{lqct}.
At t... | [
{
"created": "Mon, 14 Feb 2011 10:22:32 GMT",
"version": "v1"
}
] | 2011-09-08 | [
[
"Li",
"Yu",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | Applying the higher order holonomy corrections to the perturbation theory of cosmology, the lattice power law of Loop Quantum Cosmology, $\tilde{\mu}\propto p^{\beta}$, is analysed and the range of $\beta$ is decided to be [-1,0] which is different from the conventional range $-0.1319>\beta\geq-5/2$ \cite{lqct}. At the... |
gr-qc/0101065 | Kouji Nakamura | Kouji Nakamura | Initial condition of a thick loop cosmic string and linear perturbations | 21 pages, 4 figures, RevTeX. Some spelling / grammar typos are
corrected. Accepted for publication in Classical and Quantum Gravity | Class.Quant.Grav. 19 (2002) 783-798 | 10.1088/0264-9381/19/4/310 | NAOJ-Th-Ap 2001, No.71 | gr-qc | null | The initial data of the gravitational field produced by a loop thick string
is considered. We show that a thick loop is not a geodesic on the initial
hypersurface, while a loop conical singularity is. This suggests that there is
the ``{\it critical thickness}'' of a string, at which the linear perturbation
theory wit... | [
{
"created": "Wed, 17 Jan 2001 07:22:52 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2001 08:19:32 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Jul 2001 06:45:15 GMT",
"version": "v3"
},
{
"created": "Mon, 7 Jan 2002 05:39:16 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Nakamura",
"Kouji",
""
]
] | The initial data of the gravitational field produced by a loop thick string is considered. We show that a thick loop is not a geodesic on the initial hypersurface, while a loop conical singularity is. This suggests that there is the ``{\it critical thickness}'' of a string, at which the linear perturbation theory with ... |
1807.03000 | J\"urgen Struckmeier | J\"urgen Struckmeier, David Vasak, Johannes Kirsch | Generic Theory of Geometrodynamics from Noether's theorem for the
Diff(M) symmetry group | 40 pages | In: Kirsch J., Schramm S., Steinheimer-Froschauer J., St\"ocker H.
(eds) Discoveries at the Frontiers of Science. FIAS Interdisciplinary Science
Series. Springer, Cham. (2020) | 10.1007/978-3-030-34234-0_12 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We work out the most general theory for the interaction of spacetime geometry
and matter fields -- commonly referred to as geometrodynamics -- for spin-$0$
and spin-$1$ particles. The minimum set of postulates to be introduced is that
(i) the action principle should apply and that(ii) the total action should by
form-... | [
{
"created": "Mon, 9 Jul 2018 09:24:49 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Aug 2019 12:20:19 GMT",
"version": "v10"
},
{
"created": "Fri, 6 Sep 2019 15:41:50 GMT",
"version": "v11"
},
{
"created": "Sun, 18 Apr 2021 19:45:40 GMT",
"version": "v12"
},
{
"c... | 2022-10-06 | [
[
"Struckmeier",
"Jürgen",
""
],
[
"Vasak",
"David",
""
],
[
"Kirsch",
"Johannes",
""
]
] | We work out the most general theory for the interaction of spacetime geometry and matter fields -- commonly referred to as geometrodynamics -- for spin-$0$ and spin-$1$ particles. The minimum set of postulates to be introduced is that (i) the action principle should apply and that(ii) the total action should by form-in... |
1212.3987 | Nils Andersson | N. Andersson, C. Krueger, G. L. Comer and L. Samuelsson | A minimal model for finite temperature superfluid dynamics | RevTeX, 1 eps figure | null | 10.1088/0264-9381/30/23/235025 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building on a recently improved understanding of the problem of heat flow in
general relativity, we develop a hydrodynamical model for coupled finite
temperature superfluids. The formalism is designed with the dynamics of the
outer core of a mature neutron star (where superfluid neutrons are coupled to a
conglomerate... | [
{
"created": "Mon, 17 Dec 2012 13:38:33 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Andersson",
"N.",
""
],
[
"Krueger",
"C.",
""
],
[
"Comer",
"G. L.",
""
],
[
"Samuelsson",
"L.",
""
]
] | Building on a recently improved understanding of the problem of heat flow in general relativity, we develop a hydrodynamical model for coupled finite temperature superfluids. The formalism is designed with the dynamics of the outer core of a mature neutron star (where superfluid neutrons are coupled to a conglomerate o... |
gr-qc/0606017 | Alexander Kaganovich B. | E. I. Guendelman and A. B. Kaganovich | k-Essence, Avoidance of the Weinberg's Cosmological Constant No-Go
Theorem and Other Dark Energy Effects of Two Measures Field Theory | 25 pages, 11 figures; more detailed and improved explanation
presented on how the Weinberg's no-go theorem is avoided; references added | null | null | null | gr-qc astro-ph hep-th | null | The dilaton-gravity sector of the Two Measures Field Theory (TMT) is explored
in detail in the context of cosmology. The dilaton \phi dependence of the
effective Lagrangian appears only as a result of the spontaneous breakdown of
the scale invariance. If no fine tuning is made, the effective \phi-Lagrangian
p(\phi,X)... | [
{
"created": "Sun, 4 Jun 2006 13:05:53 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2006 11:08:37 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Guendelman",
"E. I.",
""
],
[
"Kaganovich",
"A. B.",
""
]
] | The dilaton-gravity sector of the Two Measures Field Theory (TMT) is explored in detail in the context of cosmology. The dilaton \phi dependence of the effective Lagrangian appears only as a result of the spontaneous breakdown of the scale invariance. If no fine tuning is made, the effective \phi-Lagrangian p(\phi,X) d... |
1003.0597 | Alessandro Nagar | Sebastiano Bernuzzi, Alessandro Nagar | Binary black hole merger in the extreme-mass-ratio limit: a multipolar
analysis | 20 pages, 12 figures. Version published in Phys. Rev. D | Phys.Rev.D81:084056,2010 | 10.1103/PhysRevD.81.084056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building up on previous work, we present a new calculation of the
gravitational wave (GW) emission generated during the transition from
quasi-circular inspiral to plunge, merger and ringdown by a binary system of
nonspinning black holes, of masses $m_1$ and $m_2$, in the extreme mass ratio
limit, $m_1 m_2\ll(m_1+m_2)... | [
{
"created": "Tue, 2 Mar 2010 14:10:17 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Dec 2010 13:59:41 GMT",
"version": "v2"
}
] | 2010-12-15 | [
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Nagar",
"Alessandro",
""
]
] | Building up on previous work, we present a new calculation of the gravitational wave (GW) emission generated during the transition from quasi-circular inspiral to plunge, merger and ringdown by a binary system of nonspinning black holes, of masses $m_1$ and $m_2$, in the extreme mass ratio limit, $m_1 m_2\ll(m_1+m_2)^2... |
1909.11196 | Shao-Jiang Wang | Shao-Jiang Wang | Occurrence of semiclassical vacuum decay | v1, 9 pages, 6 figures; v2, to match the published version in PRD,
title slightly changed by editor | Phys. Rev. D 100, 096019 (2019) | 10.1103/PhysRevD.100.096019 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a novel phenomenon is observed for vacuum decay to proceed via
classically allowed dynamical evolution from initial configurations of false
vacuum fluctuations. With the help of some occasionally developed large
fluctuations in time derivative of a homogeneous scalar field that is initially
sitting at the f... | [
{
"created": "Tue, 24 Sep 2019 21:37:00 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2019 16:41:22 GMT",
"version": "v2"
}
] | 2020-01-16 | [
[
"Wang",
"Shao-Jiang",
""
]
] | Recently, a novel phenomenon is observed for vacuum decay to proceed via classically allowed dynamical evolution from initial configurations of false vacuum fluctuations. With the help of some occasionally developed large fluctuations in time derivative of a homogeneous scalar field that is initially sitting at the fal... |
gr-qc/0202077 | Martin Bojowald | Martin Bojowald | Isotropic Loop Quantum Cosmology | 30 pages | Class.Quant.Grav. 19 (2002) 2717-2742 | 10.1088/0264-9381/19/10/313 | CGPG-02/2-2 | gr-qc hep-th | null | Isotropic models in loop quantum cosmology allow explicit calculations,
thanks largely to a completely known volume spectrum, which is exploited in
order to write down the evolution equation in a discrete internal time. Because
of genuinely quantum geometrical effects the classical singularity is absent in
those mode... | [
{
"created": "Thu, 21 Feb 2002 18:43:11 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bojowald",
"Martin",
""
]
] | Isotropic models in loop quantum cosmology allow explicit calculations, thanks largely to a completely known volume spectrum, which is exploited in order to write down the evolution equation in a discrete internal time. Because of genuinely quantum geometrical effects the classical singularity is absent in those models... |
gr-qc/9212004 | null | A L Matacz, A C Ottewill and P C W Davies | Quantum Vacuum Instability Near Rotating Stars | 17 Pages, (accepted by PRD), (previously incorrect header files have
been corrected) | Phys.Rev. D47 (1993) 1557-1562 | 10.1103/PhysRevD.47.1557 | null | gr-qc | null | We discuss the Starobinskii-Unruh process for the Kerr black hole. We show
how this effect is related to the theory of squeezed states. We then consider a
simple model for a highly relativistic rotating star and show that the
Starobinskii-Unruh effect is absent.
| [
{
"created": "Thu, 3 Dec 1992 19:28:00 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Dec 1992 14:19:00 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Matacz",
"A L",
""
],
[
"Ottewill",
"A C",
""
],
[
"Davies",
"P C W",
""
]
] | We discuss the Starobinskii-Unruh process for the Kerr black hole. We show how this effect is related to the theory of squeezed states. We then consider a simple model for a highly relativistic rotating star and show that the Starobinskii-Unruh effect is absent. |
gr-qc/9901028 | Dongsu Bak | Dongsu Bak, Sang Pyo kim, Sung Ku Kim, Kwang-Sup Soh, and Jae Hyung
Yee | Quantum Creation of Black Hole by Tunneling in Scalar Field Collapse | t clarification of the quantization method in Sec. IV, version to
appear in PRD | Phys.Rev.D60:064005,1999 | 10.1103/PhysRevD.60.064005 | null | gr-qc | null | Continuously self-similar solution of spherically symmetric gravitational
collapse of a scalar field is studied to investigate quantum mechanical black
hole formation by tunneling in the subcritical case where, classically, the
collapse does not produce a black hole.
| [
{
"created": "Mon, 11 Jan 1999 07:58:28 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 1999 05:05:09 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Bak",
"Dongsu",
""
],
[
"kim",
"Sang Pyo",
""
],
[
"Kim",
"Sung Ku",
""
],
[
"Soh",
"Kwang-Sup",
""
],
[
"Yee",
"Jae Hyung",
""
]
] | Continuously self-similar solution of spherically symmetric gravitational collapse of a scalar field is studied to investigate quantum mechanical black hole formation by tunneling in the subcritical case where, classically, the collapse does not produce a black hole. |
1202.0719 | Valerio Faraoni | Valerio Faraoni, Andres F. Zambrano Moreno, and Roshina Nandra | Making sense of the bizarre behaviour of horizons in the McVittie
spacetime | 8 pages, 3 figures | null | 10.1103/PhysRevD.85.083526 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The bizarre behaviour of the apparent (black hole and cosmological) horizons
of the McVittie spacetime is discussed using, as an analogy, the
Schwarzschild-de Sitter-Kottler spacetime (which is a special case of McVittie
anyway). For a dust-dominated "background" universe, a black hole cannot exist
at early times bec... | [
{
"created": "Fri, 3 Feb 2012 14:41:52 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Faraoni",
"Valerio",
""
],
[
"Moreno",
"Andres F. Zambrano",
""
],
[
"Nandra",
"Roshina",
""
]
] | The bizarre behaviour of the apparent (black hole and cosmological) horizons of the McVittie spacetime is discussed using, as an analogy, the Schwarzschild-de Sitter-Kottler spacetime (which is a special case of McVittie anyway). For a dust-dominated "background" universe, a black hole cannot exist at early times becau... |
0912.0334 | Leonardo Balart | Leonardo Balart | Quasilocal Energy, Komar Charge and Horizon for Regular Black Holes | 10 pages, no figures | Phys.Lett.B687:280-285,2010 | 10.1016/j.physletb.2010.03.056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Brown-York quasilocal energy for regular black holes. We also
express the identity that relates the difference of the Brown-York quasilocal
energy and the Komar charge at the horizon to the total energy of the spacetime
for static and spherically symmetric black hole solutions in a convenient way
which p... | [
{
"created": "Wed, 2 Dec 2009 04:27:17 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Balart",
"Leonardo",
""
]
] | We study the Brown-York quasilocal energy for regular black holes. We also express the identity that relates the difference of the Brown-York quasilocal energy and the Komar charge at the horizon to the total energy of the spacetime for static and spherically symmetric black hole solutions in a convenient way which per... |
gr-qc/9906058 | Jacob D. Bekenstein | Jacob D. Bekenstein | Non-Archimedean character of quantum buoyancy and the generalized second
law of thermodynamics | RevTeX, 16 pages | Phys.Rev. D60 (1999) 124010 | 10.1103/PhysRevD.60.124010 | null | gr-qc hep-th quant-ph | null | Quantum buoyancy has been proposed as the mechanism protecting the
generalized second law when an entropy--bearing object is slowly lowered
towards a black hole and then dropped in. We point out that the original
derivation of the buoyant force from a fluid picture of the acceleration
radiation is invalid unless the ... | [
{
"created": "Wed, 16 Jun 1999 09:05:01 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bekenstein",
"Jacob D.",
""
]
] | Quantum buoyancy has been proposed as the mechanism protecting the generalized second law when an entropy--bearing object is slowly lowered towards a black hole and then dropped in. We point out that the original derivation of the buoyant force from a fluid picture of the acceleration radiation is invalid unless the ob... |
2302.06201 | Ran Li | Ran Li, Conghua Liu, Kun Zhang, Jin Wang | Topology of the landscape and dominant kinetic path for the
thermodynamic phase transition of the charged Gauss-Bonnet AdS black holes | null | null | 10.1103/PhysRevD.108.044003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the generalized free energy of the five dimensional charged
Gauss-Bonnet AdS black holes in the grand canonical ensemble by treating the
black hole radius and the charge as the order parameters. On the two
dimensional free energy landscape, the lowest points in the basins represent
the local stable black hol... | [
{
"created": "Mon, 13 Feb 2023 09:17:34 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Li",
"Ran",
""
],
[
"Liu",
"Conghua",
""
],
[
"Zhang",
"Kun",
""
],
[
"Wang",
"Jin",
""
]
] | We study the generalized free energy of the five dimensional charged Gauss-Bonnet AdS black holes in the grand canonical ensemble by treating the black hole radius and the charge as the order parameters. On the two dimensional free energy landscape, the lowest points in the basins represent the local stable black holes... |
gr-qc/0207070 | Jose Luis Cortes | J.L. Alonso, J.L. Cortes, V. Laliena | Does a relativistic metric generalization of Newtonian gravity exist in
2+1 dimensions? | 6 pages, no figures, Revtex4. Some discussions on the physical nature
of the interior solution and on the omega->infinity limit and some references
added. Version to appear in Phys. Rev. D | Phys.Rev. D67 (2003) 024023 | 10.1103/PhysRevD.67.024023 | null | gr-qc hep-th | null | It is shown that, contrary to previous claims, a scalar tensor theory of
Brans-Dicke type provides a relativistic generalization of Newtonian gravity in
2+1 dimensions. The theory is metric and test particles follow the space-time
geodesics. The static isotropic solution is studied in vacuum and in regions
filled wit... | [
{
"created": "Thu, 18 Jul 2002 11:58:06 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Dec 2002 14:14:06 GMT",
"version": "v2"
}
] | 2012-03-15 | [
[
"Alonso",
"J. L.",
""
],
[
"Cortes",
"J. L.",
""
],
[
"Laliena",
"V.",
""
]
] | It is shown that, contrary to previous claims, a scalar tensor theory of Brans-Dicke type provides a relativistic generalization of Newtonian gravity in 2+1 dimensions. The theory is metric and test particles follow the space-time geodesics. The static isotropic solution is studied in vacuum and in regions filled with ... |
1709.03960 | Masooma Ali | Masooma Ali and Sanjeev S. Seahra | Natural Inflation from Polymer Quantization | 9 pages, 4 figures, references added | Phys. Rev. D 96, 103524 (2017) | 10.1103/PhysRevD.96.103524 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the polymer quantization of a homogeneous massive scalar field in
the early universe using a prescription inequivalent to those previously
appearing in the literature. Specifically, we assume a Hilbert space for which
the scalar field momentum is well defined but its amplitude is not. This is
closer in spiri... | [
{
"created": "Tue, 12 Sep 2017 17:18:21 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2017 16:01:56 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Oct 2017 18:07:40 GMT",
"version": "v3"
}
] | 2017-11-22 | [
[
"Ali",
"Masooma",
""
],
[
"Seahra",
"Sanjeev S.",
""
]
] | We study the polymer quantization of a homogeneous massive scalar field in the early universe using a prescription inequivalent to those previously appearing in the literature. Specifically, we assume a Hilbert space for which the scalar field momentum is well defined but its amplitude is not. This is closer in spirit ... |
1703.00844 | Wolfgang Graf | Wolfgang Graf | Existence and Stability of Circular Orbits in Time-Dependent Spherically
Symmetric Spacetimes | 24 pages, 1 figure, slightly reworked and expanded - main results
unchanged | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a general spherically four--dimensional metric the notion of
"circularity" of a family of equatorial geodesic trajectories is defined in
geometrical terms. The main object turns out to be the angular--momentum
function $J$ obeying a consistency condition involving the mean extrinsic
curvature of the submanifold c... | [
{
"created": "Thu, 2 Mar 2017 16:10:21 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2017 14:41:50 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Apr 2017 12:18:09 GMT",
"version": "v3"
},
{
"created": "Thu, 11 May 2017 12:18:34 GMT",
"version": "v4"
},
{
"cre... | 2017-06-08 | [
[
"Graf",
"Wolfgang",
""
]
] | For a general spherically four--dimensional metric the notion of "circularity" of a family of equatorial geodesic trajectories is defined in geometrical terms. The main object turns out to be the angular--momentum function $J$ obeying a consistency condition involving the mean extrinsic curvature of the submanifold con... |
1102.3863 | Ozcan Sert | Tekin Dereli and \"Ozcan Sert | Non-minimal $\ln(R)F^2$ Couplings of Electromagnetic Fields to Gravity:
Static, Spherically Symmetric Solutions | 12 pages, 5 figures, accepted for publication in EPJC | Eur.Phys.J.C71:1589,2011 | 10.1140/epjc/s10052-011-1589-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the non-minimal couplings between the electromagnetic fields
and gravity through the natural logarithm of the curvature scalar. After we
give the Lagrangian formulation of the non-minimally coupled theory, we derive
field equations by a first order variational principle using the method of
Lagrange mul... | [
{
"created": "Fri, 18 Feb 2011 15:59:01 GMT",
"version": "v1"
}
] | 2011-03-22 | [
[
"Dereli",
"Tekin",
""
],
[
"Sert",
"Özcan",
""
]
] | We investigate the non-minimal couplings between the electromagnetic fields and gravity through the natural logarithm of the curvature scalar. After we give the Lagrangian formulation of the non-minimally coupled theory, we derive field equations by a first order variational principle using the method of Lagrange multi... |
0909.2317 | Silke Weinfurtner | Mauricio Richartz, Silke Weinfurtner, A. J. Penner, and W. G. Unruh | Generalised superradiant scattering | 4 pages; new version: new title no other changes; | Phys.Rev.D80:124016,2009 | 10.1103/PhysRevD.80.124016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the necessary and sufficient conditions for the occurrence of
superradiance. Starting with a wave equation we examine the possibility of
superradiance in terms of an effective potential and boundary conditions. In
particular, we show that the existence of an ergoregion is not sufficient; an
appropriate bou... | [
{
"created": "Sat, 12 Sep 2009 09:27:28 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Sep 2009 08:01:08 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Richartz",
"Mauricio",
""
],
[
"Weinfurtner",
"Silke",
""
],
[
"Penner",
"A. J.",
""
],
[
"Unruh",
"W. G.",
""
]
] | We analyse the necessary and sufficient conditions for the occurrence of superradiance. Starting with a wave equation we examine the possibility of superradiance in terms of an effective potential and boundary conditions. In particular, we show that the existence of an ergoregion is not sufficient; an appropriate bound... |
1404.4270 | Ugur Camci | U. Camci | Symmetries of geodesic motion in G\"{o}del-type spacetimes | 21 pages, minor revision, submitted to JCAP | JCAP07(2014)002 | 10.1088/1475-7516/2014/07/002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study Noether gauge symmetries of geodesic motion for
geodesic Lagrangian of four classes of metrics of G\"{o}del-type spacetimes for
which we calculated the Noether gauge symmetries for all classes I-IV, and find
the first integrals of corresponding classes to derive a complete
characterization of ... | [
{
"created": "Wed, 16 Apr 2014 14:41:41 GMT",
"version": "v1"
},
{
"created": "Thu, 15 May 2014 15:07:08 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Camci",
"U.",
""
]
] | In this paper, we study Noether gauge symmetries of geodesic motion for geodesic Lagrangian of four classes of metrics of G\"{o}del-type spacetimes for which we calculated the Noether gauge symmetries for all classes I-IV, and find the first integrals of corresponding classes to derive a complete characterization of th... |
1712.01962 | Seyed Meraj Mousavi Rasouli | S. M. M. Rasouli, Paulo Vargas Moniz | Modified Saez-Ballester scalar-tensor theory from 5D space-time | 18 pages, 2 figures | Class. Quantum Grav. 35 (2018) 025004 | 10.1088/1361-6382/aa9ad3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we bring together the five-dimensional Saez-Ballester~(SB)
scalar-tensor theory [1] and the induced-matter-theory~(IMT) setting [2], to
obtain a modified SB theory (MSBT) in four dimensions. Specifically, by using
an intrinsic dimensional reduction procedure into the SB field equations in
five-dimensio... | [
{
"created": "Tue, 5 Dec 2017 23:05:05 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2018 14:07:52 GMT",
"version": "v2"
}
] | 2018-02-15 | [
[
"Rasouli",
"S. M. M.",
""
],
[
"Moniz",
"Paulo Vargas",
""
]
] | In this paper, we bring together the five-dimensional Saez-Ballester~(SB) scalar-tensor theory [1] and the induced-matter-theory~(IMT) setting [2], to obtain a modified SB theory (MSBT) in four dimensions. Specifically, by using an intrinsic dimensional reduction procedure into the SB field equations in five-dimensions... |
gr-qc/9807069 | N. P. Landsman | N.P. Landsman | Quantization of singular systems and incomplete motions | 8 pages | null | null | KdV-98-14 | gr-qc | null | The need for a mathematically rigorous quantization procedure of singular
spaces and incomplete motions is pointed out in connection with quantum
cosmology. We put our previous suggestion for such a procedure, based on the
theory of induced representations of C*-algebras, in the light of L. Schwartz'
theory of Hilber... | [
{
"created": "Fri, 24 Jul 1998 13:02:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Landsman",
"N. P.",
""
]
] | The need for a mathematically rigorous quantization procedure of singular spaces and incomplete motions is pointed out in connection with quantum cosmology. We put our previous suggestion for such a procedure, based on the theory of induced representations of C*-algebras, in the light of L. Schwartz' theory of Hilbert ... |
2108.03885 | Gilberto Medeiros Kremer | Gilberto M. Kremer | Jeans Instability from post-Newtonian Boltzmann equation | To appear in The European Physical Journal C | Eur. Phys. J. C (2021) 81:927 | 10.1140/epjc/s10052-021-09728-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Jeans instability within the framework of post-Newtonian Boltzmann and
Poisson equations are analyzed. The components of the energy-momentum tensor
are calculated from a post-Newtonian Maxwell-J\"uttner distribution function.
The perturbations of the distribution function and gravitational potentials
from their backg... | [
{
"created": "Mon, 9 Aug 2021 09:03:48 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2021 09:15:09 GMT",
"version": "v2"
}
] | 2021-10-26 | [
[
"Kremer",
"Gilberto M.",
""
]
] | Jeans instability within the framework of post-Newtonian Boltzmann and Poisson equations are analyzed. The components of the energy-momentum tensor are calculated from a post-Newtonian Maxwell-J\"uttner distribution function. The perturbations of the distribution function and gravitational potentials from their backgro... |
0902.2270 | J. Ponce de Leon | J. Ponce de Leon | Modern cosmologies from empty Kaluza-Klein solutions in 5D | Accepted for publication in JHEP | JHEP 0903:052,2009 | 10.1088/1126-6708/2009/03/052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the empty five-dimensional solutions of
Davidson-Sonnenschtein-Vozmediano, {\em Phys. Rev.} {\bf D32} (1985)1330, in
the "old" Kaluza-Klein gravity, under appropriate interpretation can generate
an ample variety of cosmological models in 4D, which include the
higher-dimensional modifications to general r... | [
{
"created": "Fri, 13 Feb 2009 08:39:01 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"de Leon",
"J. Ponce",
""
]
] | We show that the empty five-dimensional solutions of Davidson-Sonnenschtein-Vozmediano, {\em Phys. Rev.} {\bf D32} (1985)1330, in the "old" Kaluza-Klein gravity, under appropriate interpretation can generate an ample variety of cosmological models in 4D, which include the higher-dimensional modifications to general rel... |
1608.01642 | Michael Seifert | Michael D. Seifert | Extending the graviton propagator with a Lorentz-violating vector field | 4 pages. Presented at the Seventh Meeting on CPT and Lorentz
Symmetry, Bloomington, Indiana, June 20-24, 2016 | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss progress towards "bootstrapping" a Lorentz-violating gravity
theory: namely, extending a linear Lorentz-violating theory of a rank-2 tensor
to a non-linear theory by coupling this field to its own stress-energy tensor.
| [
{
"created": "Thu, 4 Aug 2016 18:52:21 GMT",
"version": "v1"
}
] | 2016-08-05 | [
[
"Seifert",
"Michael D.",
""
]
] | I discuss progress towards "bootstrapping" a Lorentz-violating gravity theory: namely, extending a linear Lorentz-violating theory of a rank-2 tensor to a non-linear theory by coupling this field to its own stress-energy tensor. |
0706.4452 | Louis Crane | Louis Crane | What is the Mathematical Structure of Quantum Spacetime? | 25 pages, latex file | null | null | null | gr-qc | null | We survey indications from different branches of Physics that the fine scale
structure of spacetime is not adequately described by a manifold. Based on the
hints we accumulate, we propose a new structure, which we call a quantum topos.
In the process of constructing a quantum topos for quantum gravity, we propose
a n... | [
{
"created": "Fri, 29 Jun 2007 16:01:03 GMT",
"version": "v1"
}
] | 2007-07-02 | [
[
"Crane",
"Louis",
""
]
] | We survey indications from different branches of Physics that the fine scale structure of spacetime is not adequately described by a manifold. Based on the hints we accumulate, we propose a new structure, which we call a quantum topos. In the process of constructing a quantum topos for quantum gravity, we propose a new... |
2302.06206 | Andre Maeder | Andre Maeder | MOND as a peculiar case of the SIV theory | 9 pages, 2 figures | MNRAS 520, 1447 (2023) | 10.1093/mnras/stad078 | null | gr-qc astro-ph.CO astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | The scale invariant theory is preserving the fundamental physical properties
of General Relativity, while enlarging the group of invariances subtending
gravitation theory (Dirac1973; Canuto et al.1977). The Scale Invariant Vacuum
(SIV) theory assumes, as gauging condition, that:"The macroscopic empty space
is scale i... | [
{
"created": "Mon, 13 Feb 2023 09:26:46 GMT",
"version": "v1"
}
] | 2023-10-31 | [
[
"Maeder",
"Andre",
""
]
] | The scale invariant theory is preserving the fundamental physical properties of General Relativity, while enlarging the group of invariances subtending gravitation theory (Dirac1973; Canuto et al.1977). The Scale Invariant Vacuum (SIV) theory assumes, as gauging condition, that:"The macroscopic empty space is scale inv... |
gr-qc/0107080 | Kashif Alvi | Kashif Alvi (Caltech) | Energy and angular momentum flow into a black hole in a binary | 23 pages; minor changes and additional references in v2 | Phys.Rev. D64 (2001) 104020 | 10.1103/PhysRevD.64.104020 | null | gr-qc | null | As a black hole in a binary spirals in gradually from large separation,
energy and angular momentum flow not only to infinity but also into or out of
the hole. In addition, the hole's horizon area increases slowly during this
process. In this paper, the changes in the black hole's mass, spin, and horizon
area during ... | [
{
"created": "Wed, 25 Jul 2001 01:38:33 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Sep 2001 20:05:18 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Alvi",
"Kashif",
"",
"Caltech"
]
] | As a black hole in a binary spirals in gradually from large separation, energy and angular momentum flow not only to infinity but also into or out of the hole. In addition, the hole's horizon area increases slowly during this process. In this paper, the changes in the black hole's mass, spin, and horizon area during in... |
1910.03791 | El\'ias Castellanos Dr. | El\'ias Castellanos, Celia Escamilla-Rivera and Jorge Mastache | Is a Bose-Einstein Condensate a good candidate for Dark Matter? A test
with Galaxy Rotation Curves | 21 pages, 17 figures | International Journal of Modern Physics D 2020 | 10.1142/S0218271820500637 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the rotation curves that correspond to a Bose--Einstein Condensate
(BEC) type halo surrounding a Schwarzschild--type black hole to confront
predictions of the model upon observations of galaxy rotation curves. We model
the halo as a Bose--Einstein condensate in terms of a massive scalar field that
satisfie... | [
{
"created": "Wed, 9 Oct 2019 04:52:39 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2020 00:02:35 GMT",
"version": "v2"
}
] | 2020-05-27 | [
[
"Castellanos",
"Elías",
""
],
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Mastache",
"Jorge",
""
]
] | We analyze the rotation curves that correspond to a Bose--Einstein Condensate (BEC) type halo surrounding a Schwarzschild--type black hole to confront predictions of the model upon observations of galaxy rotation curves. We model the halo as a Bose--Einstein condensate in terms of a massive scalar field that satisfies ... |
gr-qc/9707049 | Jerry Griffiths | G A Alekseev and J B Griffiths | Gravitational waves with distinct wavefronts | 14 pages, Plain TeX, no figures. To appear in Classical and Quantum
Gravity | Class.Quant.Grav.14:2869-2880,1997 | 10.1088/0264-9381/14/10/013 | null | gr-qc | null | Exact solutions of Einstein's vacuum equations are considered which describe
gravitational waves with distinct wavefronts. A family of such solutions
presented recently in which the wavefronts have various geometries and which
propagate into a number of physically significant backgrounds is here related
to an integra... | [
{
"created": "Tue, 22 Jul 1997 15:46:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alekseev",
"G A",
""
],
[
"Griffiths",
"J B",
""
]
] | Exact solutions of Einstein's vacuum equations are considered which describe gravitational waves with distinct wavefronts. A family of such solutions presented recently in which the wavefronts have various geometries and which propagate into a number of physically significant backgrounds is here related to an integral ... |
0712.3721 | Michael B. Mensky | Michael B. Mensky | On gravitational-electromagnetic resonance | 11 pages, LATEX | null | null | null | gr-qc | null | This is an English translation of the paper M.B.Mensky, in: K.P.Stanyukovich
(ed.), "Problems of Theory of Gravity and Elementary Particles", issue 6,
Moscow, Atomizdat, 1975, p.181-190 (in Russian). This paper elaborates further
the idea (formulated in 1971 by Braginsky and Mensky) of detecting
high-frequency gravit... | [
{
"created": "Fri, 21 Dec 2007 15:35:55 GMT",
"version": "v1"
}
] | 2007-12-24 | [
[
"Mensky",
"Michael B.",
""
]
] | This is an English translation of the paper M.B.Mensky, in: K.P.Stanyukovich (ed.), "Problems of Theory of Gravity and Elementary Particles", issue 6, Moscow, Atomizdat, 1975, p.181-190 (in Russian). This paper elaborates further the idea (formulated in 1971 by Braginsky and Mensky) of detecting high-frequency gravitat... |
2304.14304 | Vicharit Yingcharoenrat | Shinji Mukohyama, Kazufumi Takahashi, Keitaro Tomikawa, Vicharit
Yingcharoenrat | Quasinormal Modes from EFT of Black Hole Perturbations with Timelike
Scalar Profile | 33 pages, 4 figures, 2 tables. Matches JCAP version | null | 10.1088/1475-7516/2023/07/050 | YITP-23-45, IPMU23-0007, RUP-23-8 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The Effective Field Theory (EFT) of perturbations on an arbitrary background
geometry with a timelike scalar profile was recently constructed in the context
of scalar-tensor theories. In this paper, we use this EFT to study quasinormal
frequencies of odd-parity perturbations on a static and spherically symmetric
blac... | [
{
"created": "Thu, 27 Apr 2023 16:10:40 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jul 2023 03:41:36 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Mukohyama",
"Shinji",
""
],
[
"Takahashi",
"Kazufumi",
""
],
[
"Tomikawa",
"Keitaro",
""
],
[
"Yingcharoenrat",
"Vicharit",
""
]
] | The Effective Field Theory (EFT) of perturbations on an arbitrary background geometry with a timelike scalar profile was recently constructed in the context of scalar-tensor theories. In this paper, we use this EFT to study quasinormal frequencies of odd-parity perturbations on a static and spherically symmetric black ... |
0804.1688 | Marco Spaans | M. Spaans | On Particle Mass Changes and GR: Space-time Topology Causes LHC Leakage | small update in light of recent LHC results on the Higgs boson | null | null | null | gr-qc astro-ph.CO hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is argued that a change in particle rest mass must involve a multiply
connected space-time topology. The LHC can probe these topological effects
through the particle leakage (~18%) that it experiences in particle mass
changing interactions. With a probability of ~82%, this 4-space leakage causes
a downward shift i... | [
{
"created": "Thu, 10 Apr 2008 12:41:19 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2008 07:44:20 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Jun 2008 09:57:49 GMT",
"version": "v3"
},
{
"created": "Mon, 3 Jun 2013 06:13:54 GMT",
"version": "v4"
}
] | 2013-06-05 | [
[
"Spaans",
"M.",
""
]
] | It is argued that a change in particle rest mass must involve a multiply connected space-time topology. The LHC can probe these topological effects through the particle leakage (~18%) that it experiences in particle mass changing interactions. With a probability of ~82%, this 4-space leakage causes a downward shift in ... |
1406.2696 | Dejan Stojkovic | Dejan Stojkovic | Vanishing dimensions: Review | Invited review for MPLA, based on the following publications:
Phys.Rev.Lett. 106 (2011) 101101, Phys.Rev.Lett. 107 (2011) 169002, Phys.Rev.
D83 (2011) 114046, Mod.Phys.Lett. A27 (2012) 1250021, arXiv:1405.3297,
arXiv:1304.6444 | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review a growing theoretical motivation and evidence that the number of
dimensions actually reduces at high energies. This reduction can happen near
the Planck scale, or much before, the dimensions that are reduced can be
effective, spectral, topological or the usual dimensions, but many things
points toward the f... | [
{
"created": "Tue, 10 Jun 2014 20:00:17 GMT",
"version": "v1"
}
] | 2014-06-18 | [
[
"Stojkovic",
"Dejan",
""
]
] | We review a growing theoretical motivation and evidence that the number of dimensions actually reduces at high energies. This reduction can happen near the Planck scale, or much before, the dimensions that are reduced can be effective, spectral, topological or the usual dimensions, but many things points toward the fac... |
1901.04303 | Ujjal Debnath | Ujjal Debnath | Charge Gravastars in $f(T)$ Modified Gravity | 8 pages, Comments are welcome | null | 10.1140/epjc/s10052-019-7013-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we have discussed the four dimensional spherically
symmetric steller system in the framework of modified $f(T)$ gravity theory
with electro-magnetic field. The field equations have been written for two
cases, either $T'=0$ or $f_{TT}=0$. Next we have discussed the charged
gravastar model which ha... | [
{
"created": "Thu, 10 Jan 2019 04:33:38 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Debnath",
"Ujjal",
""
]
] | In the present work, we have discussed the four dimensional spherically symmetric steller system in the framework of modified $f(T)$ gravity theory with electro-magnetic field. The field equations have been written for two cases, either $T'=0$ or $f_{TT}=0$. Next we have discussed the charged gravastar model which has ... |
gr-qc/0112018 | Patrick J. Sutton | Patrick J. Sutton and Lee Samuel Finn | Bounding the graviton mass with binary pulsar observations | 9 pages, 1 figure. Presented at Fourth Edoardo Amaldi Conference on
Gravitational Waves, Perth, 2001 | Class.Quant.Grav. 19 (2002) 1355-1360 | 10.1088/0264-9381/19/7/318 | null | gr-qc | null | By comparing the observed orbital decay of the binary pulsars PSRB1913+16 and
PSRB1534+12 to that predicted by general relativity due to gravitational-wave
emission, we are able to bound the mass of the graviton to be less than
$7.6\times10^{-20} \text{eV}/c^2$ at 90% confidence. This is the first such
bound to be de... | [
{
"created": "Mon, 10 Dec 2001 17:48:46 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sutton",
"Patrick J.",
""
],
[
"Finn",
"Lee Samuel",
""
]
] | By comparing the observed orbital decay of the binary pulsars PSRB1913+16 and PSRB1534+12 to that predicted by general relativity due to gravitational-wave emission, we are able to bound the mass of the graviton to be less than $7.6\times10^{-20} \text{eV}/c^2$ at 90% confidence. This is the first such bound to be deri... |
1406.3237 | Maria Principe | Maria Principe | Minimum Noise Optical Coatings for Interferometric Detectors of
Gravitational Waves | 6 pages, 9 figures, 50 references, Proc of the IEEE International
Workshop on Metrology for Aerospace 2014 | null | 10.1364/OE.23.010938 | null | gr-qc astro-ph.IM physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coating Brownian noise is the dominant noise term, in a frequency band from a
few tens to a few hundreds Hz, for all Earth-bound detectors of gravitational
waves. Minimizing such noise is mandatory to increase the visibility distance
of these instruments, and eventually reach their quantum limit. Several
strategies a... | [
{
"created": "Thu, 12 Jun 2014 13:34:08 GMT",
"version": "v1"
}
] | 2023-07-19 | [
[
"Principe",
"Maria",
""
]
] | Coating Brownian noise is the dominant noise term, in a frequency band from a few tens to a few hundreds Hz, for all Earth-bound detectors of gravitational waves. Minimizing such noise is mandatory to increase the visibility distance of these instruments, and eventually reach their quantum limit. Several strategies are... |
1310.0030 | Emil Mottola | Paul R. Anderson (Wake Forest Univ.) and Emil Mottola (Los Alamos
National Laboratory) | On the Instability of Global de Sitter Space to Particle Creation | 60 pages, 15 figures | Phys. Rev. D 89, 104038 (2014) | 10.1103/PhysRevD.89.104038 | LA-UR-13-26338 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that global de Sitter space is unstable to particle creation, even
for a massive free field theory with no self-interactions. The O(4,1) de Sitter
invariant state is a definite phase coherent superposition of particle and
anti-particle solutions in both the asymptotic past and future, and therefore
is not a t... | [
{
"created": "Mon, 30 Sep 2013 20:03:39 GMT",
"version": "v1"
}
] | 2014-05-28 | [
[
"Anderson",
"Paul R.",
"",
"Wake Forest Univ."
],
[
"Mottola",
"Emil",
"",
"Los Alamos\n National Laboratory"
]
] | We show that global de Sitter space is unstable to particle creation, even for a massive free field theory with no self-interactions. The O(4,1) de Sitter invariant state is a definite phase coherent superposition of particle and anti-particle solutions in both the asymptotic past and future, and therefore is not a tru... |
0706.4301 | Keith Thorne | K. A. Thorne (for the LIGO Scientific Collaboration) | Searching for Gravitational-Wave Bursts with LIGO | 9 pages, 3 figures, for the Proceedings of the Recontres de Moriond:
Gravitational Waves and Experimental Gravity (March 11-18, 2007) | null | null | LIGO-P070062-03 | gr-qc | null | We present recent results from searches by the LIGO Science Collaboration for
bursts of gravitational-wave radiation, as well as the status of other ongoing
searches. These include directed searches for bursts associated with observed
sources (gamma-ray bursts, soft gamma repeaters) and untriggered searches for
burst... | [
{
"created": "Thu, 28 Jun 2007 19:13:29 GMT",
"version": "v1"
}
] | 2007-06-29 | [
[
"Thorne",
"K. A.",
"",
"for the LIGO Scientific Collaboration"
]
] | We present recent results from searches by the LIGO Science Collaboration for bursts of gravitational-wave radiation, as well as the status of other ongoing searches. These include directed searches for bursts associated with observed sources (gamma-ray bursts, soft gamma repeaters) and untriggered searches for bursts ... |
gr-qc/9504036 | John Baez | John C. Baez | Spin Networks in Nonperturbative Quantum Gravity | 41 pages in LaTeX | in The Interface of Knots and Physics, ed. Louis Kauffman, A.M.S.,
Providence, 1996, pp. 167-203 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spin network is a generalization of a knot or link: a graph embedded in
space, with edges labelled by representations of a Lie group, and vertices
labelled by intertwining operators. Such objects play an important role in
3-dimensional topological quantum field theory, functional integration on the
space A/G of con... | [
{
"created": "Fri, 21 Apr 1995 19:03:28 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jul 2010 05:07:13 GMT",
"version": "v2"
}
] | 2010-07-27 | [
[
"Baez",
"John C.",
""
]
] | A spin network is a generalization of a knot or link: a graph embedded in space, with edges labelled by representations of a Lie group, and vertices labelled by intertwining operators. Such objects play an important role in 3-dimensional topological quantum field theory, functional integration on the space A/G of conne... |
gr-qc/0308090 | Peter Fritschel | Peter Fritschel | Second generation instruments for the Laser Interferometer Gravitational
Wave Observatory (LIGO) | Proceedings of the SPIE conference on Astronomical Telescopes and
Instrumentations, 22-28 Aug 2002, Waikoloa, HI, USA | Proceedings of SPIE Vol. 4856 "Gravitational Wave Detection",
edited by Mike Cruise, Peter Saulson, (SPIE, Bellingham, WA, 2003) pp 282-291 | 10.1117/12.459090 | LIGO-P020016-00-R | gr-qc | null | The interferometers being planned for second generation LIGO promise and
order of magnitude increase in broadband strain sensitivity--with the
corresponding cubic increase in detection volume--and an extension of the
observation band to lower frequencies. In addition, one of the interferometers
may be designed for na... | [
{
"created": "Thu, 28 Aug 2003 14:44:51 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Fritschel",
"Peter",
""
]
] | The interferometers being planned for second generation LIGO promise and order of magnitude increase in broadband strain sensitivity--with the corresponding cubic increase in detection volume--and an extension of the observation band to lower frequencies. In addition, one of the interferometers may be designed for narr... |
2210.16439 | Nelson Yokomizo | Bekir Baytas, Nelson Yokomizo | Cosmological states in loop quantum gravity on homogeneous graphs | 60 pages, 11 figures | null | 10.1103/PhysRevD.107.066009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a class of states characterized by proposed conditions of
homogeneity and isotropy in loop quantum gravity and construct concrete
examples given by Bell-network states on a special class of homogeneous graphs.
Such states provide new representations of cosmological spaces that can be
explored for the for... | [
{
"created": "Fri, 28 Oct 2022 23:51:22 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2022 13:28:33 GMT",
"version": "v2"
}
] | 2023-03-29 | [
[
"Baytas",
"Bekir",
""
],
[
"Yokomizo",
"Nelson",
""
]
] | We introduce a class of states characterized by proposed conditions of homogeneity and isotropy in loop quantum gravity and construct concrete examples given by Bell-network states on a special class of homogeneous graphs. Such states provide new representations of cosmological spaces that can be explored for the formu... |
0707.0146 | Matt Visser | Petarpa Boonserm (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Buchdahl-like transformations for perfect fluid spheres | 23 pages | Int.J.Mod.Phys.D17:135-163,2008 | 10.1142/S0218271808011912 | null | gr-qc | null | In two previous articles [Phys. Rev. D71 (2005) 124307 (gr-qc/0503007), and
gr-qc/0607001] we have discussed several "algorithmic" techniques that permit
one (in a purely mechanical way) to generate large classes of general
relativistic static perfect fluid spheres. Working in Schwarzschild curvature
coordinates, we ... | [
{
"created": "Mon, 2 Jul 2007 05:54:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Boonserm",
"Petarpa",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | In two previous articles [Phys. Rev. D71 (2005) 124307 (gr-qc/0503007), and gr-qc/0607001] we have discussed several "algorithmic" techniques that permit one (in a purely mechanical way) to generate large classes of general relativistic static perfect fluid spheres. Working in Schwarzschild curvature coordinates, we us... |
1603.07932 | Pratik Tarafdar | Pratik Tarafdar and Tapas Kumar Das | Influence of matter geometry on shocked flows-I: Accretion in the
Schwarzschild metric | 42 pages, 9 figures. Substantial modification in various sections.
Some sections have been rewritten or rephrased | New Astronomy, 62, 1-14 (2018) | 10.1016/j.newast.2017.12.007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work presents a comprehensive and extensive study to illustrate how the
geometrical configurations of low angular momentum axially symmetric general
relativistic matter flow in Schwarzschild metric may influence the formation of
energy preserving shocks for adiabatic/polytropic accretion as well as of
temperatur... | [
{
"created": "Fri, 25 Mar 2016 15:22:00 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Sep 2016 10:14:18 GMT",
"version": "v2"
},
{
"created": "Sun, 23 Jul 2017 15:11:26 GMT",
"version": "v3"
}
] | 2021-02-08 | [
[
"Tarafdar",
"Pratik",
""
],
[
"Das",
"Tapas Kumar",
""
]
] | This work presents a comprehensive and extensive study to illustrate how the geometrical configurations of low angular momentum axially symmetric general relativistic matter flow in Schwarzschild metric may influence the formation of energy preserving shocks for adiabatic/polytropic accretion as well as of temperature ... |
1703.10320 | Jie-Xiong Mo | Jie-Xiong Mo, Gu-Qiang Li | Ratio of critical quantities related to Hawking temperature-entanglement
entropy criticality | Comments welcome. 11 pages, 3 figures | null | 10.1016/j.nuclphysb.2017.08.001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the Hawking temperature$-$entanglement entropy criticality of the
$d$-dimensional charged AdS black hole with our attention concentrated on the
ratio $\frac{T_c \delta S_c}{Q_c}$. Comparing the results of this paper with
those of the ratio $\frac{T_c S_c}{Q_c}$, one can find both the similarities
and diffe... | [
{
"created": "Thu, 30 Mar 2017 05:32:07 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Mo",
"Jie-Xiong",
""
],
[
"Li",
"Gu-Qiang",
""
]
] | We revisit the Hawking temperature$-$entanglement entropy criticality of the $d$-dimensional charged AdS black hole with our attention concentrated on the ratio $\frac{T_c \delta S_c}{Q_c}$. Comparing the results of this paper with those of the ratio $\frac{T_c S_c}{Q_c}$, one can find both the similarities and differe... |
0901.3727 | Alexis Larranaga | Alexis Larranaga, Hector J. Hortua | Temperature for the (2+1)-dimensional Black Hole with Non Linear
Electrodynamics from the Generalized Uncertainty Principle | 7 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the thermodynamical properties of the (2+1)
dimensional black hole with a non-linear electrodynamics and with a negative
cosmological constant, using the Generalized Uncertainty Principle (GUP). This
approach shows that there is a minimum mass or remnant for the black hole,
corresponding to th... | [
{
"created": "Fri, 23 Jan 2009 17:06:27 GMT",
"version": "v1"
}
] | 2010-12-10 | [
[
"Larranaga",
"Alexis",
""
],
[
"Hortua",
"Hector J.",
""
]
] | In this paper, we study the thermodynamical properties of the (2+1) dimensional black hole with a non-linear electrodynamics and with a negative cosmological constant, using the Generalized Uncertainty Principle (GUP). This approach shows that there is a minimum mass or remnant for the black hole, corresponding to the ... |
0801.4531 | Gil de Oliveira-Neto | G. Oliveira-Neto and G. F. Sousa | Qualitative and quantitative features of orbits of massive particles and
photons moving in Wyman geometry | 20 pages, 8 ps figures, IOPLaTeX | Braz.J.Phys.38:573-580,2008 | 10.1590/S0103-97332008000500008 | null | gr-qc | null | The Wyman's solution depends on two parameters, the mass $M$ and the scalar
charge $\sigma$. If one fixes $M$ to a positive value, say $M_0$, and let
$\sigma^2$ take values along the real line it describes three different types
of spacetimes. For $\sigma^2 >0$ the spacetimes are naked singularities, for
$\sigma^2 = 0... | [
{
"created": "Tue, 29 Jan 2008 16:36:11 GMT",
"version": "v1"
}
] | 2011-08-31 | [
[
"Oliveira-Neto",
"G.",
""
],
[
"Sousa",
"G. F.",
""
]
] | The Wyman's solution depends on two parameters, the mass $M$ and the scalar charge $\sigma$. If one fixes $M$ to a positive value, say $M_0$, and let $\sigma^2$ take values along the real line it describes three different types of spacetimes. For $\sigma^2 >0$ the spacetimes are naked singularities, for $\sigma^2 = 0$ ... |
gr-qc/9708027 | null | O.B. Zaslavskii | Entropy of Quantum Fields for Nonextreme Black Holes in the Extreme
Limit | 11 pages, ReVTeX, no figures. New references added, discussion
expanded, presentation and English improved. Accepted for publication in
Phys. Rev. D | Phys.Rev. D57 (1998) 6265-6268 | 10.1103/PhysRevD.57.6265 | null | gr-qc hep-th | null | Nonextreme black hole in a cavity within the framework of the canonical or
grand canonical ensemble can approach the extreme limit with a finite
temperature measured on a boundary located at a finite proper distance from the
horizon. In spite of this finite temperature, it is shown that the one-loop
contribution $S_{... | [
{
"created": "Wed, 6 Aug 1997 12:48:22 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 1997 15:03:27 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Feb 1998 13:47:53 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Zaslavskii",
"O. B.",
""
]
] | Nonextreme black hole in a cavity within the framework of the canonical or grand canonical ensemble can approach the extreme limit with a finite temperature measured on a boundary located at a finite proper distance from the horizon. In spite of this finite temperature, it is shown that the one-loop contribution $S_{q\... |
1110.2386 | Plyatsko Roman | Roman Plyatsko | Can Mathisson-Papapetrou equations give clue to some problems in
astrophysics? | 3 page | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First, we stress that for correct description of highly relativistic fermions
in a gravitational field it is necessary to have an equation which in the
limiting transition to the classical (non-quantum) case corresponds to the
exact Mathisson-Papapetrou equations. According to these equations the spin in
general rela... | [
{
"created": "Tue, 11 Oct 2011 14:23:46 GMT",
"version": "v1"
}
] | 2011-10-12 | [
[
"Plyatsko",
"Roman",
""
]
] | First, we stress that for correct description of highly relativistic fermions in a gravitational field it is necessary to have an equation which in the limiting transition to the classical (non-quantum) case corresponds to the exact Mathisson-Papapetrou equations. According to these equations the spin in general relati... |
2004.03226 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov | Fifty years of the calculation of the density of particles created in
the early Friedmann Universe | 9 pages, 2 figures | Int. J. Mod. Phys. A 35 (2020) 2040034 | 10.1142/S0217751X20400345 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of particle creation in cosmology concerning whether the results
for the number of particles are infinite or finite is discussed for scalar and
spinor particles in Friedmann expanding Universe. It is shown that the results
are always finite if one puts in case of scalar particles creation a special
term i... | [
{
"created": "Tue, 7 Apr 2020 09:39:10 GMT",
"version": "v1"
}
] | 2020-04-08 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | The problem of particle creation in cosmology concerning whether the results for the number of particles are infinite or finite is discussed for scalar and spinor particles in Friedmann expanding Universe. It is shown that the results are always finite if one puts in case of scalar particles creation a special term int... |
1112.4420 | Richard Woodard | E. O. Kahya (U. of Jena), S. P. Miao (U. of Utrecht) and R. P. Woodard
(U. of Florida) | The Coincidence Limit of the Graviton Propagator in de Donder Gauge on
de Sitter Background | 41 pages, uses LaTeX 2e, version 2 has some typoes corrected | J.Math.Phys.53:022304,2012 | 10.1063/1.3681886 | UFIFT-QG-11-05 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly work out the de Sitter breaking contributions to the recent
solution for the de Donder gauge graviton propagator on de Sitter. We also
provide explicit power series expansions for the two structure functions, which
are suitable for implementing dimensional regularization. And we evaluate the
coincidence... | [
{
"created": "Mon, 19 Dec 2011 17:48:31 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Feb 2012 16:03:25 GMT",
"version": "v2"
}
] | 2012-02-13 | [
[
"Kahya",
"E. O.",
"",
"U. of Jena"
],
[
"Miao",
"S. P.",
"",
"U. of Utrecht"
],
[
"Woodard",
"R. P.",
"",
"U. of Florida"
]
] | We explicitly work out the de Sitter breaking contributions to the recent solution for the de Donder gauge graviton propagator on de Sitter. We also provide explicit power series expansions for the two structure functions, which are suitable for implementing dimensional regularization. And we evaluate the coincidence l... |
1011.3335 | Christian R\"oken | Christian R\"oken | First-order quantum-gravitational correction to Friedmannian cosmology
from covariant, holomorphic spinfoam cosmology | null | International Journal of Modern Physics D Vol. 22, No. 0 (2013)
1350005 | 10.1142/S0218271813500053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first-order loop quantum gravity correction of the simplest, classical
general-relativistic Friedmann Hamiltonian constraint, emerging from a
holomorphic spinfoam cosmological model peaked on homogeneous, isotropic
geometries, is studied. The quantum Hamiltonian constraint, satisfied by the
EPRL transition amplit... | [
{
"created": "Mon, 15 Nov 2010 10:36:26 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2011 11:22:27 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Mar 2011 16:22:14 GMT",
"version": "v3"
},
{
"created": "Thu, 24 Nov 2011 15:12:00 GMT",
"version": "v4"
},
{
"cre... | 2015-07-02 | [
[
"Röken",
"Christian",
""
]
] | The first-order loop quantum gravity correction of the simplest, classical general-relativistic Friedmann Hamiltonian constraint, emerging from a holomorphic spinfoam cosmological model peaked on homogeneous, isotropic geometries, is studied. The quantum Hamiltonian constraint, satisfied by the EPRL transition amplitud... |
1202.1256 | Roldao da Rocha | Roldao da Rocha, J. M. Hoff da SIlva | Black string corrections in variable tension braneworld scenarios | 12 pages, 5 figures, accepted in PRD | Phys. Rev. D 85 (2012) 046009 | 10.1103/PhysRevD.85.046009 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Braneworld models with variable tension are investigated, and the corrections
on the black string horizon along the extra dimension are provided. Such
corrections are encrypted in additional terms involving the covariant
derivatives of the variable tension on the brane, providing profound
consequences concerning the ... | [
{
"created": "Mon, 6 Feb 2012 19:57:30 GMT",
"version": "v1"
}
] | 2012-02-27 | [
[
"da Rocha",
"Roldao",
""
],
[
"da SIlva",
"J. M. Hoff",
""
]
] | Braneworld models with variable tension are investigated, and the corrections on the black string horizon along the extra dimension are provided. Such corrections are encrypted in additional terms involving the covariant derivatives of the variable tension on the brane, providing profound consequences concerning the bl... |
2206.04086 | Ekapob Kulchoakrungsun | Ekapob Kulchoakrungsun, Ananya Mukherjee, Nishant Agarwal, Anthony R.
Pullen | Linear growth of structure in massive gravity | 16 pages, 5 figures. Mathematica notebook supplement is enclosed in
the source file | Phys. Rev. D 106, 083527 (2022) | 10.1103/PhysRevD.106.083527 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study background dynamics and the growth of matter perturbations in the
extended quasidilaton setup of massive gravity. For the analysis of
perturbations, we first choose a scalar field matter component and obtain the
conditions under which all scalar perturbations are stable. We work in unitary
gauge for the matt... | [
{
"created": "Wed, 8 Jun 2022 18:00:07 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2022 19:23:17 GMT",
"version": "v2"
}
] | 2022-11-01 | [
[
"Kulchoakrungsun",
"Ekapob",
""
],
[
"Mukherjee",
"Ananya",
""
],
[
"Agarwal",
"Nishant",
""
],
[
"Pullen",
"Anthony R.",
""
]
] | We study background dynamics and the growth of matter perturbations in the extended quasidilaton setup of massive gravity. For the analysis of perturbations, we first choose a scalar field matter component and obtain the conditions under which all scalar perturbations are stable. We work in unitary gauge for the matter... |
2202.12828 | Jibril Ben Achour | Jibril Ben Achour, Etera R. Livine, Shinji Mukohyama and Jean-Philippe
Uzan | Hidden symmetry of the static response of black holes: Applications to
Love numbers | 22+5 pages, clarifications added on the symmetry criterion, extension
to Kerr added in Appendix, version published in JHEP | null | null | YITP-22-17, IPMU22-0003 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that any static linear perturbations around Schwarzschild black holes
enjoy a set of conserved charges which forms a centrally extended
Schr\"{o}dinger algebra sh(1) = sl$(2,\mathbb{R}) \ltimes \mathcal{H}$. The
central charge is given by the black hole mass, echoing results on black hole
entropy from near-ho... | [
{
"created": "Fri, 25 Feb 2022 17:15:55 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jul 2022 07:13:36 GMT",
"version": "v2"
}
] | 2022-07-18 | [
[
"Achour",
"Jibril Ben",
""
],
[
"Livine",
"Etera R.",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Uzan",
"Jean-Philippe",
""
]
] | We show that any static linear perturbations around Schwarzschild black holes enjoy a set of conserved charges which forms a centrally extended Schr\"{o}dinger algebra sh(1) = sl$(2,\mathbb{R}) \ltimes \mathcal{H}$. The central charge is given by the black hole mass, echoing results on black hole entropy from near-hori... |
2108.07172 | Slava G. Turyshev | Slava G. Turyshev, Viktor T. Toth | Recovering the mass distribution of an extended gravitational lens | 21 pages, 11 figures, 1 table | MNRAS 513(4), 5355-5376 (2022) | 10.1093/mnras/stac1174 | null | gr-qc astro-ph.IM physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility of determining the mass distribution of a
gravitational lens via lensing observations. We consider an extended, compact
gravitational lens, representing its static external gravitational potential
via an infinite set of symmetric trace free (STF) multipole moments. Within the
wave-optic... | [
{
"created": "Mon, 16 Aug 2021 15:33:42 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Feb 2022 01:29:17 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Apr 2022 15:53:34 GMT",
"version": "v3"
}
] | 2022-06-06 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Toth",
"Viktor T.",
""
]
] | We investigate the possibility of determining the mass distribution of a gravitational lens via lensing observations. We consider an extended, compact gravitational lens, representing its static external gravitational potential via an infinite set of symmetric trace free (STF) multipole moments. Within the wave-optical... |
2001.02126 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | A symmetry of the Einstein-Friedmann equations for spatially flat,
perfect fluid, universes | 10 pages. Invited contribution to appear in a special issue of
Symmetry edited by S. Nojiri and T. Katsuragawa | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report a symmetry property of the Einstein-Friedmann equations for
spatially flat Friedmann-Lema\^itre-Robertson-Walker universes filled with a
perfect fluid with any constant equation of state. The symmetry transformations
form a one-parameter Abelian group.
| [
{
"created": "Tue, 7 Jan 2020 15:38:56 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | We report a symmetry property of the Einstein-Friedmann equations for spatially flat Friedmann-Lema\^itre-Robertson-Walker universes filled with a perfect fluid with any constant equation of state. The symmetry transformations form a one-parameter Abelian group. |
1803.05341 | Thomas B\"ackdahl | Steffen Aksteiner and Thomas B\"ackdahl | All local gauge invariants for perturbations of the Kerr spacetime | 5 pages. Updated references | Phys. Rev. Lett. 121, 051104 (2018) | 10.1103/PhysRevLett.121.051104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present two complex scalar gauge invariants for perturbations of the Kerr
spacetime defined covariantly in terms of the Killing vectors and the conformal
Killing-Yano tensor of the background together with the linearized curvature
and its first derivatives. These invariants are in particular sensitive to
variation... | [
{
"created": "Wed, 14 Mar 2018 15:08:49 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Aug 2018 18:56:53 GMT",
"version": "v2"
}
] | 2018-08-06 | [
[
"Aksteiner",
"Steffen",
""
],
[
"Bäckdahl",
"Thomas",
""
]
] | We present two complex scalar gauge invariants for perturbations of the Kerr spacetime defined covariantly in terms of the Killing vectors and the conformal Killing-Yano tensor of the background together with the linearized curvature and its first derivatives. These invariants are in particular sensitive to variations ... |
1207.4339 | Alexander Zhuk | Maxim Eingorn, Seyed Hossein Fakhr and Alexander Zhuk | Observational constraints on Kaluza-Klein models with $d$-dimensional
spherical compactification | 6 pages | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate Kaluza-Klein models in the case of spherical compactification
of the internal space with an arbitrary number of dimensions. The gravitating
source has the dust-like equation of state in the external/our space and an
arbitrary equation of state (with the parameter $\Omega$) in the internal
space. We get... | [
{
"created": "Wed, 18 Jul 2012 11:06:00 GMT",
"version": "v1"
}
] | 2012-07-19 | [
[
"Eingorn",
"Maxim",
""
],
[
"Fakhr",
"Seyed Hossein",
""
],
[
"Zhuk",
"Alexander",
""
]
] | We investigate Kaluza-Klein models in the case of spherical compactification of the internal space with an arbitrary number of dimensions. The gravitating source has the dust-like equation of state in the external/our space and an arbitrary equation of state (with the parameter $\Omega$) in the internal space. We get t... |
2001.00252 | Gernot Hei{\ss}el | David Fajman and Gernot Hei{\ss}el and Maciej Maliborski | On the oscillations and future asymptotics of locally rotationally
symmetric Bianchi type III cosmologies with a massive scalar field | 25 pages, 6 figures. To be published in Classical and Qunatum Gravity
- IOP. The new version includes small changes motivated by the helpful
comments of the referees. In particular, we now give more information on the
asymptotics of the scalar field | null | 10.1088/1361-6382/ab8c97 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse spatially homogenous cosmological models of locally rotationally
symmetric Bianchi type III with a massive scalar field as matter model. Our
main result concerns the future asymptotics of these spacetimes and gives the
dominant time behaviour of the metric and the scalar field for all solutions
for late ti... | [
{
"created": "Wed, 1 Jan 2020 17:53:33 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2020 12:00:36 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Fajman",
"David",
""
],
[
"Heißel",
"Gernot",
""
],
[
"Maliborski",
"Maciej",
""
]
] | We analyse spatially homogenous cosmological models of locally rotationally symmetric Bianchi type III with a massive scalar field as matter model. Our main result concerns the future asymptotics of these spacetimes and gives the dominant time behaviour of the metric and the scalar field for all solutions for late time... |
1106.1316 | Thomas Sch\"onenbach | Thomas Sch\"onenbach | Die Kerr-Metrik in pseudokomplexer Allgemeiner Relativit\"atstheorie | Master Thesis | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | This is a master thesis concerning the search for a Kerr-type metric in the
pseudocomplex General Relativity. Two different ways of deriving the standard
Kerr-metric are presented and a solution for a Kerr-type metric in the
pseudocomplex formalism is found.
| [
{
"created": "Tue, 7 Jun 2011 11:25:33 GMT",
"version": "v1"
}
] | 2011-06-08 | [
[
"Schönenbach",
"Thomas",
""
]
] | This is a master thesis concerning the search for a Kerr-type metric in the pseudocomplex General Relativity. Two different ways of deriving the standard Kerr-metric are presented and a solution for a Kerr-type metric in the pseudocomplex formalism is found. |
gr-qc/0103064 | Emilio Elizalde | E. Elizalde and Sergi R. Hildebrandt | A family of quantum interiors for ordinary and stringy black holes II:
Geometric considerations and global properties | latex, 21 pages | null | null | null | gr-qc astro-ph hep-th math-ph math.MP | null | A family of spacetimes suitable for describing the matter conditions of a
static, spherically symmetric quantum vacuum is studied, as well as its
reliability for describing a regular model for the interior of a semiclassical,
static black hole ---without ever invoking a mass shell for the final object.
In paper I, th... | [
{
"created": "Fri, 16 Mar 2001 17:08:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Elizalde",
"E.",
""
],
[
"Hildebrandt",
"Sergi R.",
""
]
] | A family of spacetimes suitable for describing the matter conditions of a static, spherically symmetric quantum vacuum is studied, as well as its reliability for describing a regular model for the interior of a semiclassical, static black hole ---without ever invoking a mass shell for the final object. In paper I, this... |
1307.6800 | Harvey S. Reall | Keiju Murata, Harvey S. Reall and Norihiro Tanahashi | What happens at the horizon(s) of an extreme black hole? | 33 pages plus appendices | null | 10.1088/0264-9381/30/23/235007 | IPMU13-0144 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A massless scalar field exhibits an instability at the event horizon of an
extreme black hole. We study numerically the nonlinear evolution of this
instability for spherically symmetric perturbations of an extreme
Reissner-Nordstrom (RN) black hole. We find that generically the endpoint of
the instability is a non-ex... | [
{
"created": "Thu, 25 Jul 2013 15:46:51 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Murata",
"Keiju",
""
],
[
"Reall",
"Harvey S.",
""
],
[
"Tanahashi",
"Norihiro",
""
]
] | A massless scalar field exhibits an instability at the event horizon of an extreme black hole. We study numerically the nonlinear evolution of this instability for spherically symmetric perturbations of an extreme Reissner-Nordstrom (RN) black hole. We find that generically the endpoint of the instability is a non-extr... |
2305.18041 | Serge Repin Mr. | Mikhail A. Bugaev, Igor D. Novikov, Serge V. Repin, Polina S.
Samorodskaya | Uniform sky glow (CMB) observed through the throat of a wormhole | 7 pages, 7 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | The problem of the possibility of observing a uniform sky glow through the
throat of a Morris--Thorne wormhole by an observer located in another
asymptotically flat space-time is considered. It is shown that an individual
star has multiple images, and the image of a luminous sky has a complex
structure and contains r... | [
{
"created": "Mon, 29 May 2023 12:10:36 GMT",
"version": "v1"
}
] | 2023-05-30 | [
[
"Bugaev",
"Mikhail A.",
""
],
[
"Novikov",
"Igor D.",
""
],
[
"Repin",
"Serge V.",
""
],
[
"Samorodskaya",
"Polina S.",
""
]
] | The problem of the possibility of observing a uniform sky glow through the throat of a Morris--Thorne wormhole by an observer located in another asymptotically flat space-time is considered. It is shown that an individual star has multiple images, and the image of a luminous sky has a complex structure and contains rin... |
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