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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2301.04457 | Maria Caruana | Salvatore Capozziello, Maria Caruana, Jackson Levi Said, Joseph
Sultana | Ghost and Laplacian Instabilities in the Teleparallel Horndeski Gravity | null | null | 10.1088/1475-7516/2023/03/060 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Teleparallel geometry offers a platform on which to build up theories of
gravity where torsion rather than curvature mediates gravitational interaction.
The teleparallel analogue of Horndeski gravity is an approach to teleparallel
geometry where scalar-tensor theories are considered in this torsional
framework. Being... | [
{
"created": "Wed, 11 Jan 2023 13:37:54 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2023 20:34:46 GMT",
"version": "v2"
}
] | 2023-04-03 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Caruana",
"Maria",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Sultana",
"Joseph",
""
]
] | Teleparallel geometry offers a platform on which to build up theories of gravity where torsion rather than curvature mediates gravitational interaction. The teleparallel analogue of Horndeski gravity is an approach to teleparallel geometry where scalar-tensor theories are considered in this torsional framework. Being t... |
1503.08712 | Mohd. Shahalam | M. Shahalam, S. D. Pathak, M. M. Verma, M. Yu. Khlopov, R. Myrzakulov | Dynamics of interacting quintessence | 11 pages, 3 figures, matches with the published version | Eur. Phys. J. C (2015) 75:395 | 10.1140/epjc/s10052-015-3608-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate coupled quintessence with scaling potential
assuming specific forms of the coupling as $A$ namely, $\alpha \dot{\rho_m}$,
$\beta \dot{\rho_{\phi}}$ and $\sigma (\dot{\rho_m}+\dot{\rho_{\phi}})$, and
present phase space analysis for three different interacting models. We focus
on the attr... | [
{
"created": "Fri, 27 Mar 2015 06:30:23 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 2015 17:11:09 GMT",
"version": "v2"
}
] | 2015-08-31 | [
[
"Shahalam",
"M.",
""
],
[
"Pathak",
"S. D.",
""
],
[
"Verma",
"M. M.",
""
],
[
"Khlopov",
"M. Yu.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | In this paper, we investigate coupled quintessence with scaling potential assuming specific forms of the coupling as $A$ namely, $\alpha \dot{\rho_m}$, $\beta \dot{\rho_{\phi}}$ and $\sigma (\dot{\rho_m}+\dot{\rho_{\phi}})$, and present phase space analysis for three different interacting models. We focus on the attrac... |
gr-qc/0510115 | Benjamin C. Harms | R. Casadio, P. H. Cox, B. Harms and O. Micu | Moving mirrors and black hole evaporation in non-commutative space-times | 7 pages, 1 figure | Phys.Rev.D73:044019,2006 | 10.1103/PhysRevD.73.044019 | null | gr-qc | null | We study the evaporation of black holes in non-commutative space-times. We do
this by calculating the correction to the detector's response function for a
moving mirror in terms of the noncommutativity parameter $\Theta$ and then
extracting the number density as modified by this parameter. We find that
allowing space... | [
{
"created": "Wed, 26 Oct 2005 19:42:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Casadio",
"R.",
""
],
[
"Cox",
"P. H.",
""
],
[
"Harms",
"B.",
""
],
[
"Micu",
"O.",
""
]
] | We study the evaporation of black holes in non-commutative space-times. We do this by calculating the correction to the detector's response function for a moving mirror in terms of the noncommutativity parameter $\Theta$ and then extracting the number density as modified by this parameter. We find that allowing space a... |
gr-qc/0210013 | Bei-Lok Hu | Sukanya Sinha, Alpan Raval, B. L. Hu | Black Hole Fluctuations and Backreaction in Stochastic Gravity | Latex 23 pages. To appear in a special issue of Foundations of
Physics {\it Thirty Years of Black Hole Physics} edited by L. Horwitz.} | Found.Phys.33:37-64,2003 | 10.1023/A:1022815724856 | umdpp 03-20 | gr-qc | null | We present a framework for analyzing black hole backreaction from the point
of view of quantum open systems using influence functional formalism. We focus
on the model of a black hole described by a radially perturbed quasi-static
metric and Hawking radiation by a conformally coupled massless quantum scalar
field. It... | [
{
"created": "Fri, 4 Oct 2002 16:30:15 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Sinha",
"Sukanya",
""
],
[
"Raval",
"Alpan",
""
],
[
"Hu",
"B. L.",
""
]
] | We present a framework for analyzing black hole backreaction from the point of view of quantum open systems using influence functional formalism. We focus on the model of a black hole described by a radially perturbed quasi-static metric and Hawking radiation by a conformally coupled massless quantum scalar field. It i... |
gr-qc/0611001 | Valerii Dryuma sem | Valerii Dryuma | On solutions of a Heavenly equations and their generalizations | 14 pages | null | null | null | gr-qc | null | Some solutions of the Heavenly equations and their generalizations are
considered
| [
{
"created": "Tue, 31 Oct 2006 22:12:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dryuma",
"Valerii",
""
]
] | Some solutions of the Heavenly equations and their generalizations are considered |
2102.13466 | Bekir Can L\"utf\"uo\u{g}lu | N. Farahani, H. Hassanabadi, W.S. Chung, B.C. Lutfuoglu, S.
Zarrinkamar | Hawking temperature of black holes using the EUP and EGUP formalisms
based on the Einstein-Bohr's photon box | 11 pages, 7 figures | EPL, 132 50009 (2020) | 10.1209/0295-5075/132/50009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, by studying the Einstein-Bohr's photon box for weighting a
photon, we find that the effective Newton constant can be proposed by the
extended uncertainty principle and extended generalized uncertainty principle.
We obtain the modified Hawking temperature, mass, specific heat, and entropy by
using the m... | [
{
"created": "Wed, 24 Feb 2021 21:57:40 GMT",
"version": "v1"
}
] | 2021-03-01 | [
[
"Farahani",
"N.",
""
],
[
"Hassanabadi",
"H.",
""
],
[
"Chung",
"W. S.",
""
],
[
"Lutfuoglu",
"B. C.",
""
],
[
"Zarrinkamar",
"S.",
""
]
] | In this paper, by studying the Einstein-Bohr's photon box for weighting a photon, we find that the effective Newton constant can be proposed by the extended uncertainty principle and extended generalized uncertainty principle. We obtain the modified Hawking temperature, mass, specific heat, and entropy by using the mod... |
2002.01149 | Ramil Izmailov N | R.N. Izmailov, R.Kh. Karimov, A.A. Potapov and K.K. Nandi | String effect on the relative time delay in the Kerr-Sen black hole | 9 pages, 2 figures, 2 tables | Ann. Phys. 413, 168069 (2020) | 10.1016/j.aop.2020.168069 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A well known solution of heterotic string theory is the spinning Kerr-Sen
black hole (KSBH) characterized by a string parameter $\xi$. Kerr black hole is
recovered at $\xi=0$. The purpose of this paper is to investigate the effect of
$\xi$ on a new diagnostic of relative time delay (RTD) to see how the latter
deviate... | [
{
"created": "Tue, 4 Feb 2020 06:44:36 GMT",
"version": "v1"
}
] | 2020-02-12 | [
[
"Izmailov",
"R. N.",
""
],
[
"Karimov",
"R. Kh.",
""
],
[
"Potapov",
"A. A.",
""
],
[
"Nandi",
"K. K.",
""
]
] | A well known solution of heterotic string theory is the spinning Kerr-Sen black hole (KSBH) characterized by a string parameter $\xi$. Kerr black hole is recovered at $\xi=0$. The purpose of this paper is to investigate the effect of $\xi$ on a new diagnostic of relative time delay (RTD) to see how the latter deviates ... |
gr-qc/0206087 | Pankaj S. Joshi | Pankaj S. Joshi | Cosmic Censorship: A Current Perspective | Invited talk at the Workshop "Interface of gravitational and quantum
realms"; IUCAA, Pune, to appear in Mod.Phys.Letts. A; 13 pages | null | null | null | gr-qc | null | End state of gravitational collapse and the related cosmic censorship
conjecture continue to be amongst the most important open problems in
gravitation physics today. My purpose here is to bring out several aspects
related to gravitational collapse and censorship, which may help towards a
better understanding of the ... | [
{
"created": "Fri, 28 Jun 2002 12:11:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Joshi",
"Pankaj S.",
""
]
] | End state of gravitational collapse and the related cosmic censorship conjecture continue to be amongst the most important open problems in gravitation physics today. My purpose here is to bring out several aspects related to gravitational collapse and censorship, which may help towards a better understanding of the is... |
1308.1685 | Aidan Keane | Jaume Carot, Aidan J Keane, Brian O J Tupper | Conformally reducible 1+3 spacetimes | Equations (9) and (11) corrected. Table 14, metric in first row
corrected | Class. Quantum Grav. 25, 055002 (2008) | 10.1088/0264-9381/25/5/055002 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spacetimes which are conformally related to reducible 1+3 spacetimes are
considered. We classify these spacetimes according to the conformal algebra of
the underlying reducible spacetime, giving in each case canonical expressions
for the metric and conformal Killing vectors, and provide physically meaningful
examples... | [
{
"created": "Wed, 7 Aug 2013 20:01:17 GMT",
"version": "v1"
}
] | 2013-08-09 | [
[
"Carot",
"Jaume",
""
],
[
"Keane",
"Aidan J",
""
],
[
"Tupper",
"Brian O J",
""
]
] | Spacetimes which are conformally related to reducible 1+3 spacetimes are considered. We classify these spacetimes according to the conformal algebra of the underlying reducible spacetime, giving in each case canonical expressions for the metric and conformal Killing vectors, and provide physically meaningful examples. |
gr-qc/0204057 | Sascha Husa | Sascha Husa | Numerical relativity with the conformal field equations | 34 pages, submitted to the Proceedings of the 2001 Spanish Relativity
meeting, eds. L. Fernandez and L. Gonzalez, to be published by Springer,
Lecture Notes in Physics series | Lect.Notes Phys. 617 (2003) 159-192 | 10.1007/3-540-36973-2_9 | AEI-2002-031 | gr-qc | null | I discuss the conformal approach to the numerical simulation of radiating
isolated systems in general relativity. The method is based on conformal
compactification and a reformulation of the Einstein equations in terms of
rescaled variables, the so-called ``conformal field equations'' developed by
Friedrich. These eq... | [
{
"created": "Wed, 17 Apr 2002 16:11:13 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Husa",
"Sascha",
""
]
] | I discuss the conformal approach to the numerical simulation of radiating isolated systems in general relativity. The method is based on conformal compactification and a reformulation of the Einstein equations in terms of rescaled variables, the so-called ``conformal field equations'' developed by Friedrich. These equa... |
1801.09098 | David Lucchesi | Massimo Visco, David M. Lucchesi | The LArase Satellites Spin mOdel Solutions (LASSOS): a comprehensive
model for the spin evolution of the LAGEOS and LARES satellites | null | Phys. Rev. D 98, 044034 (2018) | 10.1103/PhysRevD.98.044034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two LAGEOS and LARES are laser-ranged satellites tracked with the best
accuracy ever achieved. Using their range measurements many geophysical
parameters were calculated and some General Relativity effects were directly
observed. To obtain precise and refined measurements of the effects due to the
predictions of ... | [
{
"created": "Sat, 27 Jan 2018 14:50:51 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Visco",
"Massimo",
""
],
[
"Lucchesi",
"David M.",
""
]
] | The two LAGEOS and LARES are laser-ranged satellites tracked with the best accuracy ever achieved. Using their range measurements many geophysical parameters were calculated and some General Relativity effects were directly observed. To obtain precise and refined measurements of the effects due to the predictions of Ge... |
2407.08207 | Dipankar Laya | Dipanakr Laya, Roshni Bhaumik, Sourav Dutta, Subenoy Chakraborty | Classical and Quantum Cosmology in Einstein-aether Scalar-tensor
gravity: Noether Symmetry Analysis | 15 pages, 4 figures | International Journal of Modern Physics A Vol. 38, Nos. 12 & 13
(2023) 2350064 (14 pages) | 10.1142/S0217751X23500641 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The present work deals with Einstein-aether Scalar tensor gravity in the
background of homogeneous and isotropic flat FLRW space-time model. The Noether
symmetry vector identifies a transformation in the augmented space so that the
field equations become solvable. The cosmological solutions are analyzed from
the obse... | [
{
"created": "Thu, 11 Jul 2024 06:20:47 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Laya",
"Dipanakr",
""
],
[
"Bhaumik",
"Roshni",
""
],
[
"Dutta",
"Sourav",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work deals with Einstein-aether Scalar tensor gravity in the background of homogeneous and isotropic flat FLRW space-time model. The Noether symmetry vector identifies a transformation in the augmented space so that the field equations become solvable. The cosmological solutions are analyzed from the observ... |
gr-qc/0409027 | Oscar Alejandro Reula | Oscar Reula, and Olivier Sarbach | A model problem for the initial-boundary value formulation of Einstein's
field equations | 25 pages | J.Hyperbol.Diff.Equat.2:397,2005 | 10.1142/S0219891605000488 | null | gr-qc | null | In many numerical implementations of the Cauchy formulation of Einstein's
field equations one encounters artificial boundaries which raises the issue of
specifying boundary conditions. Such conditions have to be chosen carefully. In
particular, they should be compatible with the constraints, yield a well posed
initia... | [
{
"created": "Mon, 6 Sep 2004 21:33:53 GMT",
"version": "v1"
}
] | 2010-09-06 | [
[
"Reula",
"Oscar",
""
],
[
"Sarbach",
"Olivier",
""
]
] | In many numerical implementations of the Cauchy formulation of Einstein's field equations one encounters artificial boundaries which raises the issue of specifying boundary conditions. Such conditions have to be chosen carefully. In particular, they should be compatible with the constraints, yield a well posed initial-... |
1904.13060 | Morgan Le Delliou | Antonino Del Popolo, Maksym Deliyergiyev, Morgan Le Delliou, Laura
Tolos, and Fiorella Burgio | On the change of old neutron star masses with galactocentric distance | 30pp 2figs | Physics of the Dark Universe, 28 (2020) 100484 | 10.1016/j.dark.2020.100484 | null | gr-qc astro-ph.HE hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the pulsar mass depends on the environment, and that it
decreases going towards the center of the Milky Way. This is due to two
combined effects, the capture and accumulation of self-interacting,
non-annihilating dark matter by pulsars, and the increase of the dark matter
density going towards the galact... | [
{
"created": "Tue, 30 Apr 2019 05:57:40 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2020 15:13:29 GMT",
"version": "v2"
}
] | 2020-02-10 | [
[
"Del Popolo",
"Antonino",
""
],
[
"Deliyergiyev",
"Maksym",
""
],
[
"Delliou",
"Morgan Le",
""
],
[
"Tolos",
"Laura",
""
],
[
"Burgio",
"Fiorella",
""
]
] | We show that the pulsar mass depends on the environment, and that it decreases going towards the center of the Milky Way. This is due to two combined effects, the capture and accumulation of self-interacting, non-annihilating dark matter by pulsars, and the increase of the dark matter density going towards the galactic... |
gr-qc/9301018 | John D. Brown | J. David Brown and James W. York | Jacobi's Action and the Density of States | 10 pages, plain tex. (This replaces the previous version which
consisted of less than half of the manuscript.) | null | null | null | gr-qc hep-th | null | The authors have introduced recently a ``microcanonical functional integral"
which yields directly the density of states as a function of energy. The phase
of the functional integral is Jacobi's action, the extrema of which are
classical solutions at a given energy. This approach is general but is
especially well sui... | [
{
"created": "Mon, 18 Jan 1993 19:48:56 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jan 1993 20:10:42 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Brown",
"J. David",
""
],
[
"York",
"James W.",
""
]
] | The authors have introduced recently a ``microcanonical functional integral" which yields directly the density of states as a function of energy. The phase of the functional integral is Jacobi's action, the extrema of which are classical solutions at a given energy. This approach is general but is especially well suite... |
1904.09670 | Nishanth Abu Gudapati | Nishanth Gudapati | Axially Symmetric Perturbations of Kerr Black Holes I: A gauge-invariant
construction of ADM Energy | null | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the Hamiltonian dimensional reduction of $3+1$ axially symmetric,
Ricci-flat Lorentzian spacetimes to a $2+1$ Einstein-wave map system with the
(negatively curved) hyperbolic 2-plane target, we construct a
positive-definite, (spacetime) gauge-invariant energy functional for linear
axially symmetric perturbat... | [
{
"created": "Sun, 21 Apr 2019 22:33:51 GMT",
"version": "v1"
}
] | 2019-04-23 | [
[
"Gudapati",
"Nishanth",
""
]
] | Based on the Hamiltonian dimensional reduction of $3+1$ axially symmetric, Ricci-flat Lorentzian spacetimes to a $2+1$ Einstein-wave map system with the (negatively curved) hyperbolic 2-plane target, we construct a positive-definite, (spacetime) gauge-invariant energy functional for linear axially symmetric perturbatio... |
2003.07226 | Subenoy Chakraborty | Akash Bose, Subenoy Chakraborty | Homogeneous and Isotropic space-time, Modified torsion field and
Complete cosmic scenario | 8 pages,4 figures | Eur. Phys. J. C (2020) 80:205 | 10.1140/epjc/s10052-020-7771-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with cosmological solutions describing different phases of
the Universe for the homogeneous and isotropic FLRW model of the Universe with
torsion. Normally, torsion field is not suitable for maximally symmetric space
time model. However, one may use a specific profile of vectorial torsion field,
deriv... | [
{
"created": "Fri, 13 Mar 2020 10:41:36 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2020 16:00:05 GMT",
"version": "v2"
}
] | 2020-10-30 | [
[
"Bose",
"Akash",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The paper deals with cosmological solutions describing different phases of the Universe for the homogeneous and isotropic FLRW model of the Universe with torsion. Normally, torsion field is not suitable for maximally symmetric space time model. However, one may use a specific profile of vectorial torsion field, derived... |
0908.2043 | Sophie Pireaux Dr | Bertrand Chauvineau (1), Sophie Pireaux (1,2), Tania Regimbau (1),
((1) Observatoire de la Cote d'Azur, France; (2) Observatoire Royal de
Belgique, Belgium) | Shapiro delay of asteroids on LISA | 9 pages, 1 figure, published in Classical and Quantum Gravity | Class.Quant.Grav.24:3005-3011,2007 | 10.1088/0264-9381/24/11/013 | null | gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine the Shapiro delay caused by the close approach of
an asteroid to the LISA constellation. We find that the probability that such
an event occurs at a detectable level during the time interval of the mission
is smaller than 1 %.
| [
{
"created": "Fri, 14 Aug 2009 11:37:04 GMT",
"version": "v1"
}
] | 2009-08-19 | [
[
"Chauvineau",
"Bertrand",
""
],
[
"Pireaux",
"Sophie",
""
],
[
"Regimbau",
"Tania",
""
]
] | In this paper, we examine the Shapiro delay caused by the close approach of an asteroid to the LISA constellation. We find that the probability that such an event occurs at a detectable level during the time interval of the mission is smaller than 1 %. |
gr-qc/0304006 | Vladimir M. Khatsymovsky | V.M.Khatsymovsky | Regge calculus from discontinuous metrics | 8 pages, LaTeX | Phys.Lett. B567 (2003) 288-293 | 10.1016/j.physletb.2003.06.020 | null | gr-qc | null | Regge calculus is considered as a particular case of the more general system
where the linklengths of any two neighbouring 4-tetrahedra do not necessarily
coincide on their common face. This system is treated as that one described by
metric discontinuous on the faces. In the superspace of all discontinuous
metrics th... | [
{
"created": "Tue, 1 Apr 2003 14:09:51 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | Regge calculus is considered as a particular case of the more general system where the linklengths of any two neighbouring 4-tetrahedra do not necessarily coincide on their common face. This system is treated as that one described by metric discontinuous on the faces. In the superspace of all discontinuous metrics the ... |
1105.3060 | Mohammad Reza Tanhayi | M.V. Takook, H. Pejhan and M.Reza Tanhayi | Conformal linear gravity in de Sitter space II | 16 pages, no figure, published version | Eur. Phys. J. C (2012) 72:2052 | 10.1140/epjc/s10052-012-2052-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the group theoretical point of view, it is proved that the theory of
linear conformal gravity should be written in terms of a tensor field of rank-3
and mixed symmetry [Binegar, et al, Phys. Rev. D 27, (1983) 2249]. We obtained
such a field equation in de Sitter space [Takook, et al, J. Math. Phys. 51,
(2010) 03... | [
{
"created": "Mon, 16 May 2011 10:54:37 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Sep 2011 18:05:10 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Apr 2012 14:22:32 GMT",
"version": "v3"
},
{
"created": "Sat, 7 Jul 2012 08:27:45 GMT",
"version": "v4"
}
] | 2012-07-10 | [
[
"Takook",
"M. V.",
""
],
[
"Pejhan",
"H.",
""
],
[
"Tanhayi",
"M. Reza",
""
]
] | From the group theoretical point of view, it is proved that the theory of linear conformal gravity should be written in terms of a tensor field of rank-3 and mixed symmetry [Binegar, et al, Phys. Rev. D 27, (1983) 2249]. We obtained such a field equation in de Sitter space [Takook, et al, J. Math. Phys. 51, (2010) 0325... |
2312.09550 | Chan Park | Danho Ahn, Yeong-Bok Bae, Sang Hui Im, and Chan Park | Electromagnetic field in a cavity induced by gravitational waves | null | null | null | CTPU-PTC-23-53 | gr-qc astro-ph.IM hep-ex hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection method of gravitational waves (GW) using electromagnetic (EM)
cavities has garnered significant attention in recent years. This paper
thoroughly examines the analysis for the perturbation of the EM field and
raises some issues in the existing literature. Our work demonstrates that the
rigid condition im... | [
{
"created": "Fri, 15 Dec 2023 06:03:28 GMT",
"version": "v1"
}
] | 2023-12-20 | [
[
"Ahn",
"Danho",
""
],
[
"Bae",
"Yeong-Bok",
""
],
[
"Im",
"Sang Hui",
""
],
[
"Park",
"Chan",
""
]
] | The detection method of gravitational waves (GW) using electromagnetic (EM) cavities has garnered significant attention in recent years. This paper thoroughly examines the analysis for the perturbation of the EM field and raises some issues in the existing literature. Our work demonstrates that the rigid condition impo... |
1310.3069 | Saira Waheed | M. Sharif and Saira Waheed | Dynamics of Potentials in Bianchi Type Scalar-Tensor Cosmology | 20 pages, 4 figures. Phys. Lett. B (2013) | null | 10.1016/j.physletb.2013.08.044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study investigates the nature of the field potential via new
technique known as reconstruction method for the scalar field potentials. The
key point of this technique is the assumption that Hubble parameter is
dependent on the scalar field. We consider Bianchi type I universe in the
gravitational framewor... | [
{
"created": "Fri, 11 Oct 2013 09:53:54 GMT",
"version": "v1"
}
] | 2013-10-14 | [
[
"Sharif",
"M.",
""
],
[
"Waheed",
"Saira",
""
]
] | The present study investigates the nature of the field potential via new technique known as reconstruction method for the scalar field potentials. The key point of this technique is the assumption that Hubble parameter is dependent on the scalar field. We consider Bianchi type I universe in the gravitational framework ... |
1203.4446 | Massimiliano Rinaldi | Jean-Philippe Bruneton and Massimiliano Rinaldi and Antonin Kanfon and
Aur\'elien Hees and Sandrine Schl\"ogel and Andr\'e F\"uzfa | Fab Four: When John and George play gravitation and cosmology | Minor changes, references added. Version accepted for publication in
Advances in Astronomy | Advances in Astronomy, Volume 2012 (2012), 430694 | 10.1155/2012/430694 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor theories of gravitation have recently regained a great interest
after the discovery of the Chameleon mechanism and of the Galileon models. The
former allows, in principle, to reconcile the presence of cosmological scalar
fields with the constraints from experiments at the Solar System scale. The
latter ... | [
{
"created": "Tue, 20 Mar 2012 14:11:57 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2012 07:23:22 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Nov 2012 14:24:17 GMT",
"version": "v3"
}
] | 2013-01-08 | [
[
"Bruneton",
"Jean-Philippe",
""
],
[
"Rinaldi",
"Massimiliano",
""
],
[
"Kanfon",
"Antonin",
""
],
[
"Hees",
"Aurélien",
""
],
[
"Schlögel",
"Sandrine",
""
],
[
"Füzfa",
"André",
""
]
] | Scalar-tensor theories of gravitation have recently regained a great interest after the discovery of the Chameleon mechanism and of the Galileon models. The former allows, in principle, to reconcile the presence of cosmological scalar fields with the constraints from experiments at the Solar System scale. The latter op... |
gr-qc/0302025 | Luciano Rezzolla | Luciano Rezzolla | Gravitational Waves from Perturbed Black Holes and Relativistic Stars | Lectures given at the Summer School on Astroparticle Physics and
Cosmology, ICTP, July 2002 (47 pages, 9 figs) | ICTP Lecture Series, Vol. 3, (2003) ISBN 92-95003-05-5 | null | null | gr-qc astro-ph | null | These lectures aim at providing an introduction to the properties of
gravitational waves and in particular to those gravitational waves that are
expected as a consequence of perturbations of black holes and neutron stars.
Imprinted in the gravitational radiation emitted by these objects is, in fact,
a wealth of physi... | [
{
"created": "Fri, 7 Feb 2003 18:26:17 GMT",
"version": "v1"
}
] | 2009-04-16 | [
[
"Rezzolla",
"Luciano",
""
]
] | These lectures aim at providing an introduction to the properties of gravitational waves and in particular to those gravitational waves that are expected as a consequence of perturbations of black holes and neutron stars. Imprinted in the gravitational radiation emitted by these objects is, in fact, a wealth of physica... |
1512.03268 | Giulia Gubitosi | Giulia Gubitosi and Joao Magueijo | Reappraisal of a model for deformed special relativity | null | null | 10.1088/0264-9381/33/11/115021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit one of the earliest proposals for deformed dispersion relations in
the light of recent results on dynamical dimensional reduction and production
of cosmological fluctuations. Depending on the specification of the measure of
integration and addition rule in momentum space the model may be completed so
as to... | [
{
"created": "Thu, 10 Dec 2015 14:35:55 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"Gubitosi",
"Giulia",
""
],
[
"Magueijo",
"Joao",
""
]
] | We revisit one of the earliest proposals for deformed dispersion relations in the light of recent results on dynamical dimensional reduction and production of cosmological fluctuations. Depending on the specification of the measure of integration and addition rule in momentum space the model may be completed so as to m... |
2204.03901 | Daniela Pugliese Dr | D. Pugliese and Z. Stuchl{\i}k | Dragged surfaces. On the accretion tori in the ergoregion | 43 pages, 40 figure multipanels, 2 tables | PASJ-Volume 73, Issue 6, pp.1497-1539 (December 2021) | 10.1093/pasj/psab093 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We discuss the conditions for the existence of extended matter configurations
orbiting in the ergoregion or close to the outer ergosurface of the Kerr black
hole ("dragged" configurations). The corotating tori under consideration are
perfect fluid configurations with barotropic equation of state, orbiting on the
equa... | [
{
"created": "Fri, 8 Apr 2022 08:03:06 GMT",
"version": "v1"
}
] | 2022-04-11 | [
[
"Pugliese",
"D.",
""
],
[
"Stuchlık",
"Z.",
""
]
] | We discuss the conditions for the existence of extended matter configurations orbiting in the ergoregion or close to the outer ergosurface of the Kerr black hole ("dragged" configurations). The corotating tori under consideration are perfect fluid configurations with barotropic equation of state, orbiting on the equato... |
gr-qc/9709062 | My Account | Hyeong-Chan Kim (Sung Kyun Kwan Univ.) and Min-Ho Lee (Kumoh Univ.)
Jeong-Young Ji (Seoul National Univ.) | The origin of the area law of the entropy of a quantum field in a black
hole | 4 pages, revtex | null | null | SKKU-97/H2 | gr-qc | null | It is shown that that the area law for the entropy of a quantum field in the
Schwarzschild black hole is due to the quantum statistics. The entropies for
one particle, a Boltzmann gas, a quantum mechanical gas obeying Bose-Einstein
or Fermi-Dirac statistics, and a quantum field in the Schwarzschild black hole
are cal... | [
{
"created": "Wed, 24 Sep 1997 16:00:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"Hyeong-Chan",
"",
"Sung Kyun Kwan Univ."
],
[
"Lee",
"Min-Ho",
"",
"Kumoh Univ."
],
[
"Ji",
"Jeong-Young",
"",
"Seoul National Univ."
]
] | It is shown that that the area law for the entropy of a quantum field in the Schwarzschild black hole is due to the quantum statistics. The entropies for one particle, a Boltzmann gas, a quantum mechanical gas obeying Bose-Einstein or Fermi-Dirac statistics, and a quantum field in the Schwarzschild black hole are calcu... |
gr-qc/9606002 | Ruth A. W. Gregory | Ruth Gregory | Nonsingular global strings | 21 pages plain TEX, 4 figs. Published version (minor error corrected) | Phys.Rev. D54 (1996) 4955-4962 | 10.1103/PhysRevD.54.4955 | DTP/96/25 | gr-qc astro-ph hep-ph hep-th | null | We examine the possibility that time dependence might remove the singular
nature of global string spacetimes. We first show that this time dependence
takes a specific form -- a de-Sitter like expansion along the length of the
string and give an argument for the existence of such a solution, estimating
the rate of exp... | [
{
"created": "Tue, 4 Jun 1996 10:01:55 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 1997 09:44:24 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Gregory",
"Ruth",
""
]
] | We examine the possibility that time dependence might remove the singular nature of global string spacetimes. We first show that this time dependence takes a specific form -- a de-Sitter like expansion along the length of the string and give an argument for the existence of such a solution, estimating the rate of expan... |
0711.2019 | Roberto Casadio | Corrado Appignani and Roberto Casadio | Hints of (trans-Planckian) asymptotic freedom in semiclassical cosmology | 11 pages, 2 figures; replaced to match content of published version | JCAP0806:014,2008 | 10.1088/1475-7516/2008/06/014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ the semiclassical approximation to the Wheeler-DeWitt equation in
the spatially flat de Sitter Universe to investigate the dynamics of a
minimally coupled scalar field near the Planck scale. We find that, contrary to
naive intuition, the effects of quantum gravitational fluctuations become
negligible and th... | [
{
"created": "Tue, 13 Nov 2007 16:09:29 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2008 18:58:56 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jul 2008 09:15:28 GMT",
"version": "v3"
}
] | 2008-11-07 | [
[
"Appignani",
"Corrado",
""
],
[
"Casadio",
"Roberto",
""
]
] | We employ the semiclassical approximation to the Wheeler-DeWitt equation in the spatially flat de Sitter Universe to investigate the dynamics of a minimally coupled scalar field near the Planck scale. We find that, contrary to naive intuition, the effects of quantum gravitational fluctuations become negligible and the ... |
2310.19838 | Liubov Panasenko | A. D. Dolgov, L. A. Panasenko, V. A. Bochko | Graviton to photon conversion in curved space-time and external magnetic
field | 38 pages, 2 figures | Universe (ISSN 2218-1997) | 10.3390/universe10010007 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The suppression of relic gravitational waves due to their conversion into
electromagnetic radiation in a cosmological magnetic field is studied. The
coupled system of equations describing gravitational and electromagnetic wave
propagation in an arbitrary curved space-time and in external magnetic field is
derived. Th... | [
{
"created": "Mon, 30 Oct 2023 03:13:37 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Dec 2023 03:03:59 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Dolgov",
"A. D.",
""
],
[
"Panasenko",
"L. A.",
""
],
[
"Bochko",
"V. A.",
""
]
] | The suppression of relic gravitational waves due to their conversion into electromagnetic radiation in a cosmological magnetic field is studied. The coupled system of equations describing gravitational and electromagnetic wave propagation in an arbitrary curved space-time and in external magnetic field is derived. The ... |
1905.00408 | Tiziano Abdelsalhin | Tiziano Abdelsalhin | Tidal deformations of compact objects and gravitational wave emission | PhD thesis. Related publications: arXiv:1712.01303 (Abdelsalhin et
al., PRD, 2018), arXiv:1805.01487 (Abdelsalhin et al., PRD, 2018) and
arXiv:1807.08016 (Jimenez-Forteza et al., PRD, 2018) | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations of gravitational wave (GW) signals produced by coalescing binary
neutron stars (NS), like the GW event GW170817, can be exploited to constrain
the equation of state (EoS) of matter in the stars' inner core. The information
on the internal structure and composition of the stars is encoded in their
tidal L... | [
{
"created": "Wed, 1 May 2019 17:49:19 GMT",
"version": "v1"
}
] | 2019-05-02 | [
[
"Abdelsalhin",
"Tiziano",
""
]
] | Observations of gravitational wave (GW) signals produced by coalescing binary neutron stars (NS), like the GW event GW170817, can be exploited to constrain the equation of state (EoS) of matter in the stars' inner core. The information on the internal structure and composition of the stars is encoded in their tidal Lov... |
2304.13058 | Alexander Florian Jercher | Alexander Jercher, Sebastian Steinhaus, Johannes Th\"urigen | Curvature effects in the spectral dimension of spin foams | 52 pages, 24 figures | Phys. Rev. D 108, 066011, 14 September 2023 | 10.1103/PhysRevD.108.066011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown in [1] that a class of restricted spin foam models can
feature a reduced spectral dimension of space-time. However, it is still an
open question how curvature affects the flow of the spectral dimension. To
answer this question, we consider another class of restricted spin foam models,
so called spin... | [
{
"created": "Tue, 25 Apr 2023 18:00:06 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Sep 2023 07:06:15 GMT",
"version": "v2"
}
] | 2023-09-18 | [
[
"Jercher",
"Alexander",
""
],
[
"Steinhaus",
"Sebastian",
""
],
[
"Thürigen",
"Johannes",
""
]
] | It has been shown in [1] that a class of restricted spin foam models can feature a reduced spectral dimension of space-time. However, it is still an open question how curvature affects the flow of the spectral dimension. To answer this question, we consider another class of restricted spin foam models, so called spin f... |
1006.4195 | Gavin Polhemus | Gavin Polhemus and Andrew J S Hamilton | Large entropy production inside black holes: a simple model | 10 pages | JHEP 1008:093,2010 | 10.1007/JHEP08(2010)093 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Particles dropped into a rotating black hole can collide near the inner
horizon with enormous energies. The entropy produced by these collisions can be
several times larger than the increase in the horizon entropy due to the
addition of the particles. In this paper entropy is produced by releasing large
numbers of ne... | [
{
"created": "Tue, 22 Jun 2010 00:39:04 GMT",
"version": "v1"
}
] | 2012-01-16 | [
[
"Polhemus",
"Gavin",
""
],
[
"Hamilton",
"Andrew J S",
""
]
] | Particles dropped into a rotating black hole can collide near the inner horizon with enormous energies. The entropy produced by these collisions can be several times larger than the increase in the horizon entropy due to the addition of the particles. In this paper entropy is produced by releasing large numbers of neut... |
2310.19631 | Vitalii Vertogradov | Timur Pryadilin, Daniil Zhitov, Vitalii Vertogradov | On particle collisions in the vicinity of the charged black holes | 10 pages, accepted to Gravitation and Cosmology | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The process of particle collision in the vicinity of black holes is known to
generate unbounded energies in the center-of-mass frame (the Banados-Silk-West
(BSW) effect) under specific conditions. We consider this process in the
charged black hole metrics, namely, the Reissner-Nordstrom (RN) and
Majumdar-Papapetrou (... | [
{
"created": "Mon, 30 Oct 2023 15:24:01 GMT",
"version": "v1"
}
] | 2023-10-31 | [
[
"Pryadilin",
"Timur",
""
],
[
"Zhitov",
"Daniil",
""
],
[
"Vertogradov",
"Vitalii",
""
]
] | The process of particle collision in the vicinity of black holes is known to generate unbounded energies in the center-of-mass frame (the Banados-Silk-West (BSW) effect) under specific conditions. We consider this process in the charged black hole metrics, namely, the Reissner-Nordstrom (RN) and Majumdar-Papapetrou (MP... |
2211.12327 | Bahtiyar \"Ozg\"ur Sar{\i}o\u{g}lu | Ulf Lindstr\"om and \"Ozg\"ur Sar{\i}o\u{g}lu | A comment on Metric vs Metric-Affine Gravity | Three pages, no figures, accepted for publication in Physics Letters
B | Physics Letters B 836 (2023) 137619 | 10.1016/j.physletb.2022.137619 | UUITP-52/22 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the sum of the Einstein-Hilbert action and a Pontryagin density
(PD) in arbitrary even dimension $D$. All curvatures are functions of
independent affine (torsionless) connections only. In arbitrary dimension, not
only in $D=4n$, these first order PD terms are shown to be covariant
divergences of "Chern-Si... | [
{
"created": "Mon, 21 Nov 2022 13:03:33 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2022 11:16:04 GMT",
"version": "v2"
}
] | 2022-12-12 | [
[
"Lindström",
"Ulf",
""
],
[
"Sarıoğlu",
"Özgür",
""
]
] | We consider the sum of the Einstein-Hilbert action and a Pontryagin density (PD) in arbitrary even dimension $D$. All curvatures are functions of independent affine (torsionless) connections only. In arbitrary dimension, not only in $D=4n$, these first order PD terms are shown to be covariant divergences of "Chern-Simo... |
1804.05176 | Yen Chin Ong | Yen Chin Ong | Generalized Uncertainty Principle, Black Holes, and White Dwarfs: A Tale
of Two Infinities | 9 pages, 6 figures; version accepted by JCAP | JCAP 09 (2018) 015 | 10.1088/1475-7516/2018/09/015 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is often argued that quantum gravitational correction to the Heisenberg's
uncertainty principle leads to, among other things, a black hole remnant with
finite temperature. However, such a generalized uncertainty principle also
seemingly removes the Chandrasekhar limit, i.e., it permits white dwarfs to be
arbitrari... | [
{
"created": "Sat, 14 Apr 2018 06:42:19 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2018 13:02:08 GMT",
"version": "v2"
}
] | 2018-09-18 | [
[
"Ong",
"Yen Chin",
""
]
] | It is often argued that quantum gravitational correction to the Heisenberg's uncertainty principle leads to, among other things, a black hole remnant with finite temperature. However, such a generalized uncertainty principle also seemingly removes the Chandrasekhar limit, i.e., it permits white dwarfs to be arbitrarily... |
gr-qc/9510026 | Masoud Mohazzab | M. Mohazzab, M. M. Sheikh Jabbari and H. Salehi | Expansion of Bubbles in Inflationary Universe | 8 pages, latex, no figures | null | null | IPM-95-90 | gr-qc astro-ph hep-th | null | We show that particle production during the expansion of bubbles of true
vacuum in the sea of false vacuum is possible and calculate the resulting rate.
As a result the nucleated bubbles cannot expand due to the transfer of false
vacuum energy to the created particles inside the bubbles. Therefore all the
inflationar... | [
{
"created": "Sat, 14 Oct 1995 06:20:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mohazzab",
"M.",
""
],
[
"Jabbari",
"M. M. Sheikh",
""
],
[
"Salehi",
"H.",
""
]
] | We show that particle production during the expansion of bubbles of true vacuum in the sea of false vacuum is possible and calculate the resulting rate. As a result the nucleated bubbles cannot expand due to the transfer of false vacuum energy to the created particles inside the bubbles. Therefore all the inflationary ... |
1506.08613 | Antonia Zipfel | Antonia Zipfel and Thomas Thiemann | Stable coherent states | null | Phys. Rev. D 93, 084030 (2016) | 10.1103/PhysRevD.93.084030 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the stability under time evolution of complexifier coherent states
(CCS) in one-dimensional mechanical systems. A system of coherent states is
called stable if it evolves into another coherent state. It turns out that a
system can only poses stable CCS if the classical evolution of the variable for
a given... | [
{
"created": "Mon, 29 Jun 2015 13:28:15 GMT",
"version": "v1"
}
] | 2016-04-20 | [
[
"Zipfel",
"Antonia",
""
],
[
"Thiemann",
"Thomas",
""
]
] | We analyze the stability under time evolution of complexifier coherent states (CCS) in one-dimensional mechanical systems. A system of coherent states is called stable if it evolves into another coherent state. It turns out that a system can only poses stable CCS if the classical evolution of the variable for a given c... |
1402.2922 | Santiago Esteban Perez Bergliaffa | Nora Bret\'on and Santiago Esteban Perez Bergliaffa | On the stability of black holes with nonlinear electromagnetic fields | 14 pages, 16 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stability of three static and spherically symmetric black hole solutions
with nonlinear electromagnetism as a source is investigated in three different
ways. We show that the specific heat of all the solutions displays an infinite
discontinuity with a change of sign, but the turning point method indicates
that th... | [
{
"created": "Wed, 12 Feb 2014 18:30:35 GMT",
"version": "v1"
}
] | 2014-02-13 | [
[
"Bretón",
"Nora",
""
],
[
"Bergliaffa",
"Santiago Esteban Perez",
""
]
] | The stability of three static and spherically symmetric black hole solutions with nonlinear electromagnetism as a source is investigated in three different ways. We show that the specific heat of all the solutions displays an infinite discontinuity with a change of sign, but the turning point method indicates that the ... |
2211.07835 | Matt Visser | Matt Visser (Victoria University of Wellington) | Efficient computation of null affine parameters | V1: 22 pages; V2: Now 35 pages. Note change in title. Significant
additions in terms of discussion, examples, and references. Closely parallels
the published version | Universe 9 (2023) 521 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Finding affine parameters for null geodesics is often of considerable
physical importance, especially when studying the paths swept out by null
geodesics or when dealing with conservation laws and/or averaged energy
conditions. But explicitly finding null affine parameters is also often quite
tedious and can sometime... | [
{
"created": "Tue, 15 Nov 2022 01:27:09 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2023 02:15:22 GMT",
"version": "v2"
}
] | 2023-12-21 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Finding affine parameters for null geodesics is often of considerable physical importance, especially when studying the paths swept out by null geodesics or when dealing with conservation laws and/or averaged energy conditions. But explicitly finding null affine parameters is also often quite tedious and can sometimes ... |
gr-qc/0412057 | Lorenzo Iorio | Lorenzo Iorio | A critical analysis of a recent test of the Lense-Thirring effect with
the LAGEOS satellites | LaTeX2e, 24 pages, 8 tables, 2 figures. This submission replaces the
previous one, which was clearly wrong. I apologize for the confusion
generated. This version is the one published in J. of Geodesy | J.Geod. 80 (2006) 128-136 | 10.1007/s00190-006-0058-4 | null | gr-qc astro-ph physics.space-ph | null | We discuss the impact of the present-day uncertainties in the recently
released CHAMP and/or GRACE Earth gravity models on the measurement of the
Lense-Thirring effect with the nodes of the LAGEOS satellites. Also the role of
the secular variations Jdots of the even zonal harmonics is quantitatively
assessed via nume... | [
{
"created": "Sun, 12 Dec 2004 20:09:21 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2004 23:57:56 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Feb 2005 22:15:06 GMT",
"version": "v3"
},
{
"created": "Tue, 5 Jul 2005 13:17:11 GMT",
"version": "v4"
},
{
"cr... | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | We discuss the impact of the present-day uncertainties in the recently released CHAMP and/or GRACE Earth gravity models on the measurement of the Lense-Thirring effect with the nodes of the LAGEOS satellites. Also the role of the secular variations Jdots of the even zonal harmonics is quantitatively assessed via numeri... |
gr-qc/0306064 | Chris Isham | C.J. Isham | A New Approach to Quantising Space-Time: III. State Vectors as Functions
on Arrows | Latex2e | Adv.Theor.Math.Phys. 8 (2004) 797-811 | null | null | gr-qc math-ph math.MP quant-ph | null | In two recent papers by the author, a new approach was suggested for
quantising space-time, or space. This involved developing a procedure for
quantising a system whose configuration space--or history-theory analogue--is
the set of objects, $\Ob\Q$, in a (small) category $\Q$. The quantum states in
this approach are ... | [
{
"created": "Mon, 16 Jun 2003 11:15:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Isham",
"C. J.",
""
]
] | In two recent papers by the author, a new approach was suggested for quantising space-time, or space. This involved developing a procedure for quantising a system whose configuration space--or history-theory analogue--is the set of objects, $\Ob\Q$, in a (small) category $\Q$. The quantum states in this approach are cr... |
1708.02429 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia, Leonardo Barcaroli, Stefano Bianco, Laura
Pensato | Planck-scale dual-curvature lensing and spacetime noncommutativity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently realized that Planck-scale momentum-space curvature, which is
expected in some approaches to the quantum-gravity problem, can produce
dual-curvature lensing, a feature which mainly affects the direction of
observation of particles emitted by very distant sources. Several gray areas
remain in our under... | [
{
"created": "Tue, 8 Aug 2017 09:40:55 GMT",
"version": "v1"
}
] | 2017-08-09 | [
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Barcaroli",
"Leonardo",
""
],
[
"Bianco",
"Stefano",
""
],
[
"Pensato",
"Laura",
""
]
] | It was recently realized that Planck-scale momentum-space curvature, which is expected in some approaches to the quantum-gravity problem, can produce dual-curvature lensing, a feature which mainly affects the direction of observation of particles emitted by very distant sources. Several gray areas remain in our underst... |
gr-qc/0207093 | J. Frauendiener | J. Frauendiener | Some aspects of the numerical treatment of the conformal field equations | Contribution to the Proceedings of the Workshop "The conformal
structure of space-times: geometry, analysis, numerics", Tuebingen April
2001. To appear in Lecture Notes in Physics, Springer Verlag, edited by J.
Frauendiener and H. Friedrich | Lect.Notes Phys. 604 (2002) 261-282 | null | null | gr-qc | null | Some issues in the numerical treatment of the conformal field equations are
discussed. In particular, the problem of obtaining smooth initial data for the
hyperboloidal initial value problem is described and solution methods are
presented.
| [
{
"created": "Wed, 24 Jul 2002 14:01:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Frauendiener",
"J.",
""
]
] | Some issues in the numerical treatment of the conformal field equations are discussed. In particular, the problem of obtaining smooth initial data for the hyperboloidal initial value problem is described and solution methods are presented. |
1805.11600 | Bernardo Araneda | Bernardo Araneda | Conformal invariance, complex structures, and the Teukolsky connection | 24 pages | null | 10.1088/1361-6382/aad13b | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Teukolsky connection, which defines generalized wave
operators governing the behavior of massless fields on Einstein spacetimes of
Petrov type D, has its origin in a distinguished conformally and GHP covariant
connection on the conformal structure of the spacetime. The conformal class has
a (metric c... | [
{
"created": "Tue, 29 May 2018 17:38:31 GMT",
"version": "v1"
}
] | 2018-08-08 | [
[
"Araneda",
"Bernardo",
""
]
] | We show that the Teukolsky connection, which defines generalized wave operators governing the behavior of massless fields on Einstein spacetimes of Petrov type D, has its origin in a distinguished conformally and GHP covariant connection on the conformal structure of the spacetime. The conformal class has a (metric com... |
2312.15457 | Pierre-Alexandre Duverne | Pierre-Alexandre Duverne and St\'ephanie Hoang and Tito Dal Canton and
Sarah Antier and Nicolas Arnaud and Patrice Hello and Francesco Pannarale | Optimizing the low-latency localization of gravitational waves | 12 pages, 9 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational-wave data from interferometric detectors like LIGO, Virgo and
KAGRA is routinely analyzed by rapid matched-filtering algorithms to detect
compact binary merger events and rapidly infer their spatial position, which
enables the discovery of associated non-GW transients like GRB 170817A and
AT2017gfo. One... | [
{
"created": "Sun, 24 Dec 2023 10:51:50 GMT",
"version": "v1"
}
] | 2023-12-27 | [
[
"Duverne",
"Pierre-Alexandre",
""
],
[
"Hoang",
"Stéphanie",
""
],
[
"Canton",
"Tito Dal",
""
],
[
"Antier",
"Sarah",
""
],
[
"Arnaud",
"Nicolas",
""
],
[
"Hello",
"Patrice",
""
],
[
"Pannarale",
"Francesco",
... | Gravitational-wave data from interferometric detectors like LIGO, Virgo and KAGRA is routinely analyzed by rapid matched-filtering algorithms to detect compact binary merger events and rapidly infer their spatial position, which enables the discovery of associated non-GW transients like GRB 170817A and AT2017gfo. One o... |
0809.1480 | Dong-han Yeom | Sungwook E. Hong, Dong-il Hwang, Dong-han Yeom, Heeseung Zoe | Black hole complementarity with local horizons and Horowitz-Maldacena's
proposal | 22 pages, 11 figures | JHEP 0812:080,2008 | 10.1088/1126-6708/2008/12/080 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To implement the consistent black hole complementarity principle, we need two
assumptions: first, there exists a singularity near the center, and second,
global horizons are the same as local horizons. However, these assumptions are
not true in general. In this paper, the authors study a charged black hole in
which t... | [
{
"created": "Tue, 9 Sep 2008 07:25:22 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Nov 2008 09:02:21 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Dec 2008 08:05:47 GMT",
"version": "v3"
}
] | 2008-12-25 | [
[
"Hong",
"Sungwook E.",
""
],
[
"Hwang",
"Dong-il",
""
],
[
"Yeom",
"Dong-han",
""
],
[
"Zoe",
"Heeseung",
""
]
] | To implement the consistent black hole complementarity principle, we need two assumptions: first, there exists a singularity near the center, and second, global horizons are the same as local horizons. However, these assumptions are not true in general. In this paper, the authors study a charged black hole in which the... |
gr-qc/0701039 | Hiroyuki Nakano | Hiroyuki Nakano, Carlos O. Lousto | Regular second order perturbations of extreme mass ratio black hole
binaries | 4 pages, prepared for the proceedings of the 16th workshop on general
relativity and gravitation, Niigata, Japan, Nov.27 - Dec.1, 2006 | null | null | null | gr-qc | null | We report on the first results of self-consistent second order metric
perturbations produced by a point particle moving in the Schwarzschild
spacetime. The second order waveforms satisfy a wave equation with an effective
source term build up from products of first order metric perturbations and its
derivatives. We ha... | [
{
"created": "Fri, 5 Jan 2007 20:49:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Lousto",
"Carlos O.",
""
]
] | We report on the first results of self-consistent second order metric perturbations produced by a point particle moving in the Schwarzschild spacetime. The second order waveforms satisfy a wave equation with an effective source term build up from products of first order metric perturbations and its derivatives. We have... |
1407.4103 | Shahram Jalalzadeh | Mostafa Hashemi, Shahram Jalalzadeh and Amir Hadi Ziaie | Collapse and dispersal of a homogeneous spin fluid in Einstein-Cartan
theory | 16 pages, 5 figures, revised version | Eur. Phys. J. C (2015) 75:53 | 10.1140/epjc/s10052-015-3276-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we revisit the process of gravitational collapse of a
spherically symmetric homogeneous dust fluid which is known as the
Oppenheimer-Snyder (OS) model [1]. We show that such a scenario would not end
in a spacetime singularity when the spin degrees of freedom of fermionic
particles within the coll... | [
{
"created": "Tue, 15 Jul 2014 19:31:16 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 2015 10:19:58 GMT",
"version": "v2"
}
] | 2015-02-25 | [
[
"Hashemi",
"Mostafa",
""
],
[
"Jalalzadeh",
"Shahram",
""
],
[
"Ziaie",
"Amir Hadi",
""
]
] | In the present work, we revisit the process of gravitational collapse of a spherically symmetric homogeneous dust fluid which is known as the Oppenheimer-Snyder (OS) model [1]. We show that such a scenario would not end in a spacetime singularity when the spin degrees of freedom of fermionic particles within the collap... |
1507.06661 | John D. Swain | A. Widom, J. Swain, and Y. Srivastava | Experimental Tests of Local Cosmological Expansion Rates | Presented on July 17, 2015 at the 14th Marcel Grossmann International
Conference held at Sapienza, University of Rome, Italy (To appear in the
Proceedings of the Conference); reformatted for the proceedings but with the
same content | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological expansion on a local scale is usually neglected in part due to
its smallness, and in part due to components of bound systems (especially those
bound by non-gravitational forces such as atoms and nuclei) not following the
geodesics of the cosmological metric. However, it is interesting to ask whether
or n... | [
{
"created": "Fri, 17 Jul 2015 18:56:40 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Oct 2015 18:41:04 GMT",
"version": "v2"
}
] | 2015-10-06 | [
[
"Widom",
"A.",
""
],
[
"Swain",
"J.",
""
],
[
"Srivastava",
"Y.",
""
]
] | Cosmological expansion on a local scale is usually neglected in part due to its smallness, and in part due to components of bound systems (especially those bound by non-gravitational forces such as atoms and nuclei) not following the geodesics of the cosmological metric. However, it is interesting to ask whether or not... |
1910.03300 | Charles Wang | Charles H.-T. Wang, Marcin Stankiewicz | Quantization of time and the big bang via scale-invariant loop gravity | 7 pages, 4 figures, version to appear in PLB | Physics Letters B 800 (2020) 135106 | 10.1016/j.physletb.2019.135106 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the background-independent quantization of a general
scale-invariant theory of gravity with matter, which supports a conserved Weyl
current recently suggested as a natural flow of time. For scalar-metric
systems, a conformal class of Ashtekar-Barbero connection variables is
constructed, which can be quant... | [
{
"created": "Tue, 8 Oct 2019 09:42:54 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2019 16:46:47 GMT",
"version": "v2"
}
] | 2019-11-21 | [
[
"Wang",
"Charles H. -T.",
""
],
[
"Stankiewicz",
"Marcin",
""
]
] | We consider the background-independent quantization of a general scale-invariant theory of gravity with matter, which supports a conserved Weyl current recently suggested as a natural flow of time. For scalar-metric systems, a conformal class of Ashtekar-Barbero connection variables is constructed, which can be quantiz... |
2008.00429 | Manu Srivastava | Manu Srivastava, S. Shankaranarayanan (Indian Institute of Technology
Bombay) | Non-trivial quantum fluctuations in asymptotically non-flat black-hole
space-times | 29 pages, 8 figures, version accepted for publication in Annals of
Physics | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation remains a crucial theoretical prediction of semi-classical
gravity and is considered one of the critical tests for a model of quantum
gravity. However, Hawking's original derivation used quantum field theory on a
fixed background. Efforts have been made to include the spacetime fluctuations
arising ... | [
{
"created": "Sun, 2 Aug 2020 07:55:33 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2022 03:32:08 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Srivastava",
"Manu",
"",
"Indian Institute of Technology\n Bombay"
],
[
"Shankaranarayanan",
"S.",
"",
"Indian Institute of Technology\n Bombay"
]
] | Hawking radiation remains a crucial theoretical prediction of semi-classical gravity and is considered one of the critical tests for a model of quantum gravity. However, Hawking's original derivation used quantum field theory on a fixed background. Efforts have been made to include the spacetime fluctuations arising fr... |
2304.07496 | Junji Jia | Yujie Duan, Siyan Lin, Junji Jia | Deflection and gravitational lensing with finite distance effect in the
strong deflection limit in stationary and axisymmetric spacetimes | 15 pages, 10 figures; updated to publish version | null | 10.1088/1475-7516/2023/07/036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the deflection and gravitational lensing (GL) of both timelike and
null signals in the equatorial plane of arbitrary stationary and axisymmetric
spacetimes in the strong deflection limit. Our approach employs a perturbative
method to show that both the deflection angle and the total travel time take
quasi-se... | [
{
"created": "Sat, 15 Apr 2023 07:33:51 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2023 06:59:02 GMT",
"version": "v2"
}
] | 2023-07-19 | [
[
"Duan",
"Yujie",
""
],
[
"Lin",
"Siyan",
""
],
[
"Jia",
"Junji",
""
]
] | We study the deflection and gravitational lensing (GL) of both timelike and null signals in the equatorial plane of arbitrary stationary and axisymmetric spacetimes in the strong deflection limit. Our approach employs a perturbative method to show that both the deflection angle and the total travel time take quasi-seri... |
2010.00298 | Spiros Cotsakis | Spiros Cotsakis | Onset of synchronization in coupled Mixmaster oscillators | 40 pages, version to appear in the Phil. Trans. Roy. Soc. A | Phil. Trans. R. Soc. A380 (2022) 20210189 | 10.1098/rsta.2021.0189 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of asymptotic synchronization of different spatial
points coupled to each other in inhomogeneous spacetime and undergoing chaotic
Mixmaster oscillations towards the singularity. We demonstrate that for
couplings larger than some threshold value, two Mixmaster spatial points $A,B$,
with $A$ in ... | [
{
"created": "Thu, 1 Oct 2020 10:58:06 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jun 2021 10:11:39 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Jul 2021 11:09:29 GMT",
"version": "v3"
}
] | 2022-03-16 | [
[
"Cotsakis",
"Spiros",
""
]
] | We consider the problem of asymptotic synchronization of different spatial points coupled to each other in inhomogeneous spacetime and undergoing chaotic Mixmaster oscillations towards the singularity. We demonstrate that for couplings larger than some threshold value, two Mixmaster spatial points $A,B$, with $A$ in th... |
1003.4851 | Manuel Tessmer | Manuel Tessmer | Circular inspiral templates | 3 pages, 1 table | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a new class of restricted gravitational wave search templates,
termed the TaylorEt template was proposed for the search of inspiralling
compact binaries. The TaylorEt approximant is different from the usual
time-domain post-Newtonian approximants in that it employs the orbital binding
energy rather than the... | [
{
"created": "Thu, 25 Mar 2010 10:46:39 GMT",
"version": "v1"
}
] | 2010-03-26 | [
[
"Tessmer",
"Manuel",
""
]
] | Recently, a new class of restricted gravitational wave search templates, termed the TaylorEt template was proposed for the search of inspiralling compact binaries. The TaylorEt approximant is different from the usual time-domain post-Newtonian approximants in that it employs the orbital binding energy rather than the o... |
1907.03578 | David Garfinkle | David Garfinkle | Matters of Gravity: The Newsletter of the Division of Gravitational
Physics of the American Physical Society. Number 53. June, 2019 | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | we hear that..., by David Garfinkle
Gravitational-wave Standard Sirens, by Daniel Holz and Maya Fishbach
HartleFest, by Gary Horowitz
| [
{
"created": "Wed, 3 Jul 2019 20:22:34 GMT",
"version": "v1"
}
] | 2019-07-09 | [
[
"Garfinkle",
"David",
""
]
] | we hear that..., by David Garfinkle Gravitational-wave Standard Sirens, by Daniel Holz and Maya Fishbach HartleFest, by Gary Horowitz |
2008.04106 | Ritabrata Biswas | Giridhari Deogharia, Mayukh Bandyopadhyay and Ritabrata Biswas | Generalized Model of Interacting Dark Energy and Dark Matter : Phase
Portrait Analysis of Evolving Universe | 12 page, 12 figures | null | 10.1142/S0217732321502758 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Main aim of this work is to give a suitable explanation of present
accelerating universe through an acceptable interactive dynamical cosmological
model. A three-fluid cosmological model is introduced in the background of
Friedmann-Lema\^itre-Robertson-Walker asymptotically flat spacetime. This model
consists of inter... | [
{
"created": "Thu, 6 Aug 2020 18:14:55 GMT",
"version": "v1"
}
] | 2022-02-16 | [
[
"Deogharia",
"Giridhari",
""
],
[
"Bandyopadhyay",
"Mayukh",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | Main aim of this work is to give a suitable explanation of present accelerating universe through an acceptable interactive dynamical cosmological model. A three-fluid cosmological model is introduced in the background of Friedmann-Lema\^itre-Robertson-Walker asymptotically flat spacetime. This model consists of interac... |
1705.02533 | Andrew DeBenedictis | Jesse Velay-Vitow, Andrew DeBenedictis | Junction Conditions for F(T) Gravity from a Variational Principle | 14 pages, 1 figure. Updated version contains clarification on the
role of the spin connection and a number of added references. Matches version
accepted for publication in Phys. Rev. D | Phys. Rev. D 96, 024055 (2017) | 10.1103/PhysRevD.96.024055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a general set of acceptable junction conditions for $F(T)$ gravity
via the variational principle. The analysis is valid for both the traditional
form of $F(T)$ gravity theory as well as the more recently introduced Lorentz
covariant theory of Kr\v{s}\v{s}\'ak and Saridakis. We find that the general
junction... | [
{
"created": "Sat, 6 May 2017 23:06:15 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2017 18:22:06 GMT",
"version": "v2"
}
] | 2017-07-31 | [
[
"Velay-Vitow",
"Jesse",
""
],
[
"DeBenedictis",
"Andrew",
""
]
] | We derive a general set of acceptable junction conditions for $F(T)$ gravity via the variational principle. The analysis is valid for both the traditional form of $F(T)$ gravity theory as well as the more recently introduced Lorentz covariant theory of Kr\v{s}\v{s}\'ak and Saridakis. We find that the general junction c... |
1703.06265 | Nosiphiwo Zwane Ms | Nosiphiwo Zwane, Niayesh Afshordi and Rafael D. Sorkin | Cosmological Tests of Everpresent $\Lambda$ | null | null | 10.1088/1361-6382/aadc36 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Everpresent $\Lambda$ is a cosmological scenario in which the observed
cosmological "constant" $\Lambda$ fluctuates between positive and negative
values with a vanishing mean, and with a magnitude comparable to the critical
density at any epoch. In accord with a longstanding heuristic prediction of
causal set theory,... | [
{
"created": "Sat, 18 Mar 2017 07:47:23 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2017 07:09:57 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Jun 2017 03:25:38 GMT",
"version": "v3"
},
{
"created": "Tue, 22 May 2018 22:54:36 GMT",
"version": "v4"
}
] | 2018-10-17 | [
[
"Zwane",
"Nosiphiwo",
""
],
[
"Afshordi",
"Niayesh",
""
],
[
"Sorkin",
"Rafael D.",
""
]
] | Everpresent $\Lambda$ is a cosmological scenario in which the observed cosmological "constant" $\Lambda$ fluctuates between positive and negative values with a vanishing mean, and with a magnitude comparable to the critical density at any epoch. In accord with a longstanding heuristic prediction of causal set theory, i... |
1904.06207 | Cosimo Bambi | Askar B. Abdikamalov, Ahmadjon A. Abdujabbarov, Dimitry Ayzenberg,
Daniele Malafarina, Cosimo Bambi, Bobomurat Ahmedov | Black hole mimicker hiding in the shadow: Optical properties of the
$\gamma$-metric | 12 pages, 7 figures. v3: refereed version | Phys. Rev. D 100, 024014 (2019) | 10.1103/PhysRevD.100.024014 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Can the observation of the "shadow" allow us to distinguish a black hole from
a more exotic compact object? We study the motion of photons in a class of
vacuum static axially-symmetric space-times that is continuously linked to the
Schwarzschild metric through the value of one parameter that can be interpreted
as a m... | [
{
"created": "Thu, 11 Apr 2019 12:47:12 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2019 16:49:06 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Jul 2019 22:38:50 GMT",
"version": "v3"
}
] | 2019-07-12 | [
[
"Abdikamalov",
"Askar B.",
""
],
[
"Abdujabbarov",
"Ahmadjon A.",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Malafarina",
"Daniele",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Ahmedov",
"Bobomurat",
""
]
] | Can the observation of the "shadow" allow us to distinguish a black hole from a more exotic compact object? We study the motion of photons in a class of vacuum static axially-symmetric space-times that is continuously linked to the Schwarzschild metric through the value of one parameter that can be interpreted as a mea... |
gr-qc/0703155 | Chris Messenger | C. Messenger and G. Woan | A fast search strategy for gravitational waves from low-mass X-ray
binaries | 13 pages, 3 figures, to appear in the GWDAW 11 conference proceedings | Class.Quant.Grav.24:S469-S480,2007 | 10.1088/0264-9381/24/19/S10 | null | gr-qc | null | We present a new type of search strategy designed specifically to find
continuously emitting gravitational wave sources in known binary systems based
on the incoherent sum of frequency modulated binary signal sidebands. The
search pipeline can be divided into three stages: the first is a wide
bandwidth, F-statistic s... | [
{
"created": "Fri, 30 Mar 2007 16:51:40 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Apr 2007 16:01:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Messenger",
"C.",
""
],
[
"Woan",
"G.",
""
]
] | We present a new type of search strategy designed specifically to find continuously emitting gravitational wave sources in known binary systems based on the incoherent sum of frequency modulated binary signal sidebands. The search pipeline can be divided into three stages: the first is a wide bandwidth, F-statistic sea... |
0710.3565 | Parampreet Singh | Abhay Ashtekar, Alejandro Corichi, Parampreet Singh | Robustness of key features of loop quantum cosmology | Two changes from the published version: (1) Use of the scalar field
clock already in the classical theory leads to a soluble model without any
assumptions. sLQC now stands for soluble (rather than simplified) LQC; (2)
Some intermediate steps corrected, thanks to a comment by Prof. Ian Lawrie.
This also simplifi... | Phys.Rev.D77:024046,2008 | 10.1103/PhysRevD.77.024046 | IGC-07/10-01, PI-QG-61 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop quantum cosmology of the k=0 FRW model (with a massless scalar field) is
shown to be exactly soluble if the scalar field is used as the internal time
already in the classical Hamiltonian theory. Analytical methods are then used
i) to show that the quantum bounce is generic; ii) to establish that the matter
densi... | [
{
"created": "Thu, 18 Oct 2007 17:38:57 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2007 00:12:43 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jan 2008 17:34:01 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Apr 2010 16:43:46 GMT",
"version": "v4"
}
] | 2010-04-23 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Corichi",
"Alejandro",
""
],
[
"Singh",
"Parampreet",
""
]
] | Loop quantum cosmology of the k=0 FRW model (with a massless scalar field) is shown to be exactly soluble if the scalar field is used as the internal time already in the classical Hamiltonian theory. Analytical methods are then used i) to show that the quantum bounce is generic; ii) to establish that the matter density... |
2111.02282 | Theo Torres | Theo Torres | Hydrodynamic simulations of rotating black holes | PhD thesis - 187 pages | null | null | null | gr-qc physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | Wave scattering phenomena are ubiquitous in almost all Sciences, from Biology
to Physics. Interestingly, it has been shown many times that different physical
systems are the stage to the same processes. The discoveries of such analogies
have resulted in a better understanding of Physics and are indications of the
uni... | [
{
"created": "Wed, 3 Nov 2021 15:17:32 GMT",
"version": "v1"
}
] | 2021-11-04 | [
[
"Torres",
"Theo",
""
]
] | Wave scattering phenomena are ubiquitous in almost all Sciences, from Biology to Physics. Interestingly, it has been shown many times that different physical systems are the stage to the same processes. The discoveries of such analogies have resulted in a better understanding of Physics and are indications of the unive... |
gr-qc/0211106 | Hendryk Pfeiffer | Hendryk Pfeiffer | Positivity of relativistic spin network evaluations | 15 pages, LaTeX2e, 8 figures | Adv.Theor.Math.Phys. 6 (2002) 827-846 | null | null | gr-qc | null | Let G be a compact Lie group. Using suitable normalization conventions, we
show that the evaluation of GxG-symmetric spin networks is non-negative
whenever the edges are labeled by representations of the form V\otimes V^*
where V is a representation of G, and the intertwiners are generalizations of
the Barrett--Crane... | [
{
"created": "Fri, 29 Nov 2002 16:24:13 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jan 2004 16:23:13 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Pfeiffer",
"Hendryk",
""
]
] | Let G be a compact Lie group. Using suitable normalization conventions, we show that the evaluation of GxG-symmetric spin networks is non-negative whenever the edges are labeled by representations of the form V\otimes V^* where V is a representation of G, and the intertwiners are generalizations of the Barrett--Crane i... |
0909.2578 | Raphael Lamon | Raphael Lamon | Loop Quantum Cosmology on a Torus | 35 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the effect of a torus topology on Loop Quantum
Cosmology. We first derive the Teichmueller space parametrizing all possible
tori using Thurston's theorem and construct a Hamiltonian describing the
dynamics of these torus universes. We then compute the Ashtekar variables for a
slightly simplifie... | [
{
"created": "Mon, 14 Sep 2009 15:34:05 GMT",
"version": "v1"
}
] | 2009-09-15 | [
[
"Lamon",
"Raphael",
""
]
] | In this paper we study the effect of a torus topology on Loop Quantum Cosmology. We first derive the Teichmueller space parametrizing all possible tori using Thurston's theorem and construct a Hamiltonian describing the dynamics of these torus universes. We then compute the Ashtekar variables for a slightly simplified ... |
gr-qc/0101042 | Fay Dowker | H.F. Dowker and R.D. Sorkin | Spin and statistics in quantum gravity | 14 pages, 4 figures, LaTeX | Proceedings of the international meeting on ``Spin-statistics
connections and commutation relations, experimental tests and theoretical
implications,'' Capri, Italy, May 31-June 4, 2000, eds. R.C. Hilborn and G.M.
Tino, pp. 205-218 | null | null | gr-qc | null | We present a review of the spin and statistics of topological geons,
particles in 3+1 quantum gravity. They can have half-odd-integral spin and
fermionic statistics and since the underlying gravitational field is tensorial
and bosonic, this is an example of ``emergent'' non-trivial spin and statistics
as displayed by... | [
{
"created": "Thu, 11 Jan 2001 12:49:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dowker",
"H. F.",
""
],
[
"Sorkin",
"R. D.",
""
]
] | We present a review of the spin and statistics of topological geons, particles in 3+1 quantum gravity. They can have half-odd-integral spin and fermionic statistics and since the underlying gravitational field is tensorial and bosonic, this is an example of ``emergent'' non-trivial spin and statistics as displayed by f... |
2004.04506 | Christof Wetterich | C. Wetterich | Crossing the Big Bang singularity | further precisions on inhomogeneous cosmologies, 11 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple model for a scalar field and gravity admits homogeneous isotropic
cosmological solutions which cross the Big Bang singularity. In the scaling
frame with field dependent effective Planck mass these solutions are regular.
They become singular in the Einstein frame with fixed Planck mass. This field
singularity... | [
{
"created": "Thu, 9 Apr 2020 12:06:46 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2020 10:28:26 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Oct 2020 11:46:17 GMT",
"version": "v3"
},
{
"created": "Mon, 26 Jul 2021 16:14:12 GMT",
"version": "v4"
}
] | 2021-07-27 | [
[
"Wetterich",
"C.",
""
]
] | A simple model for a scalar field and gravity admits homogeneous isotropic cosmological solutions which cross the Big Bang singularity. In the scaling frame with field dependent effective Planck mass these solutions are regular. They become singular in the Einstein frame with fixed Planck mass. This field singularity a... |
1805.03440 | Oleg Zaslavskii | O. B. Zaslavskii | Distorted vacuum black holes in the canonical ensemble | 6 pages. Eq. 8 written more accurately. Matches published version | Mod. Phys. Lett. A, Vol. 34, Nos. 7 & 8 (2019) 1950060 | 10.1142/S0217732319500603 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a vacuum static spacetime in a finite size cavity. On the
boundary, we specify a metric and a finite constant local temperature $T$. No
spherical or any other spatial symmetry is assumed. We show that (i) inside a
cavity, only a black hole or flat spacetime are possible, whereas a curved
horizonless regul... | [
{
"created": "Wed, 9 May 2018 10:03:12 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Mar 2019 11:06:12 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider a vacuum static spacetime in a finite size cavity. On the boundary, we specify a metric and a finite constant local temperature $T$. No spherical or any other spatial symmetry is assumed. We show that (i) inside a cavity, only a black hole or flat spacetime are possible, whereas a curved horizonless regular... |
1906.01979 | Jose Alejandro Rosabal Rodriguez | J.A. Rosabal | Rindler Observer Sublimation | 25 pages, 7 figures, matches the published version | JMP Vol.11 No.9, September 22, 2020 | 10.4236/jmp.2020.119086 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we propose that an object moving with proper constant
acceleration, i.e., a Rindler observer experiences a sublimation (or
evaporation) process. In this first proposal, we do not consider the
backreaction due to the sublimation. We focus on charged matter particles for
the discussion, but for simplicity... | [
{
"created": "Sun, 2 Jun 2019 05:59:28 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2019 04:47:57 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Oct 2020 08:45:36 GMT",
"version": "v3"
}
] | 2020-10-08 | [
[
"Rosabal",
"J. A.",
""
]
] | In this note, we propose that an object moving with proper constant acceleration, i.e., a Rindler observer experiences a sublimation (or evaporation) process. In this first proposal, we do not consider the backreaction due to the sublimation. We focus on charged matter particles for the discussion, but for simplicity, ... |
2203.05270 | Vitalii Vertogradov | Vitalii Vertogradov | Non-linearity of Vaidya spacetime and forces in the central naked
singularity | null | Physics of Complex Systems, 2022, vol. 3, no. 2 | 10.33910/2687-153X-2022-3-2-81-85 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper we consider non-linear Vaidya spacetime i.e. the case when the
mass function has the non-linear form $M(v) \equiv \lambda v^n \,, \lambda >0
\,, n>1 $. We prove that the central naked singularity might form for values
$n>1$ but they are gravitationally weak. Also we investigate the question about
forces... | [
{
"created": "Thu, 10 Mar 2022 10:06:47 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2022 14:08:29 GMT",
"version": "v2"
}
] | 2022-12-08 | [
[
"Vertogradov",
"Vitalii",
""
]
] | In this paper we consider non-linear Vaidya spacetime i.e. the case when the mass function has the non-linear form $M(v) \equiv \lambda v^n \,, \lambda >0 \,, n>1 $. We prove that the central naked singularity might form for values $n>1$ but they are gravitationally weak. Also we investigate the question about forces i... |
1711.01899 | Yosef Verbin | Y. Verbin and Y. Brihaye | Charged Boson Stars and Black Holes with Non-Minimal Coupling to Gravity | Revised version. Accepted for publication in Phys Rev D | Phys. Rev. D 97, 044046 (2018) | 10.1103/PhysRevD.97.044046 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find new spherically symmetric charged boson star solutions of a complex
scalar field coupled non-minimally to gravity by a "John-type" term of
Horndeski theory, that is a coupling between the kinetic scalar term and
Einstein tensor. We study the parameter space of the solutions and find two
distinct families acco... | [
{
"created": "Mon, 6 Nov 2017 14:04:47 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2017 15:30:26 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Feb 2018 14:39:19 GMT",
"version": "v3"
}
] | 2018-03-07 | [
[
"Verbin",
"Y.",
""
],
[
"Brihaye",
"Y.",
""
]
] | We find new spherically symmetric charged boson star solutions of a complex scalar field coupled non-minimally to gravity by a "John-type" term of Horndeski theory, that is a coupling between the kinetic scalar term and Einstein tensor. We study the parameter space of the solutions and find two distinct families accord... |
gr-qc/0007046 | Folomeev V. N. | V. Ts. Gurovich, H.-J. Schmidt and I. V. Tokareva | Tunneling of the Closed Friedmann Universe with Generation of Scalar
Waves | Latex 2e, 7 pages, 1 figure. Submitted to General Relativity and
Gravitation | Gen.Rel.Grav. 33 (2001) 591-601 | 10.1023/A:1010253025941 | null | gr-qc | null | The evolution of the closed Friedmann Universe with a packet of short scalar
waves is considered with the help of the Wheeler--DeWitt equation. The packet
ensures conservation of homogeneity and isotropy of the metric on average. It
is shown that during tunneling the amplitudes of short waves of a scalar field
can in... | [
{
"created": "Wed, 19 Jul 2000 10:12:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Gurovich",
"V. Ts.",
""
],
[
"Schmidt",
"H. -J.",
""
],
[
"Tokareva",
"I. V.",
""
]
] | The evolution of the closed Friedmann Universe with a packet of short scalar waves is considered with the help of the Wheeler--DeWitt equation. The packet ensures conservation of homogeneity and isotropy of the metric on average. It is shown that during tunneling the amplitudes of short waves of a scalar field can incr... |
gr-qc/0504036 | Kayll Lake | Steven Conboy and Kayll Lake | Smooth transitions from Schwarzschild vacuum to de Sitter space | revtex4, two figures. Final form to appear in Phys. Rev. D | Phys.Rev. D71 (2005) 124017 | 10.1103/PhysRevD.71.124017 | null | gr-qc | null | We provide an infinity of spacetimes which contain part of both the
Schwarzschild vacuum and de Sitter space. The transition, which occurs below
the Schwarzschild event horizon, involves only boundary surfaces (no surface
layers). An explicit example is given in which the weak and strong energy
conditions are satisfi... | [
{
"created": "Fri, 8 Apr 2005 16:39:55 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2005 19:35:22 GMT",
"version": "v2"
},
{
"created": "Fri, 27 May 2005 14:30:09 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Conboy",
"Steven",
""
],
[
"Lake",
"Kayll",
""
]
] | We provide an infinity of spacetimes which contain part of both the Schwarzschild vacuum and de Sitter space. The transition, which occurs below the Schwarzschild event horizon, involves only boundary surfaces (no surface layers). An explicit example is given in which the weak and strong energy conditions are satisfied... |
1707.01784 | Gabriel G. Carvalho PhD | Iarley P. Lobo and Gabriel G. Carvalho | The geometry of null-like disformal transformations | Accepted for publication in IJGMMP. 24 pages, 2 figures.Typos
corrected, figures updated and addition of an appendix on disformal
transformations on spinor space | null | 10.1142/S0219887819501809 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the hindrance of defining metric tensors compatible with the
underlying spinor structure, other than the ones obtained via a conformal
transformation, we study how some geometric objects are affected by the action
of a disformal transformation in the closest scenario possible: the disformal
transformatio... | [
{
"created": "Thu, 6 Jul 2017 13:40:46 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Oct 2019 12:03:32 GMT",
"version": "v2"
}
] | 2019-10-15 | [
[
"Lobo",
"Iarley P.",
""
],
[
"Carvalho",
"Gabriel G.",
""
]
] | Motivated by the hindrance of defining metric tensors compatible with the underlying spinor structure, other than the ones obtained via a conformal transformation, we study how some geometric objects are affected by the action of a disformal transformation in the closest scenario possible: the disformal transformation ... |
1503.02832 | Orlando Luongo | Salvatore Capozziello, Orlando Luongo, Emmanuel N. Saridakis | Transition redshift in $f(T)$ cosmology and observational constraints | 11 pages, 1 table, 7 figures | Phys. Rev. D, 91, 124037, (2015) | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extract constraints on the transition redshift $z_{tr}$, determining the
onset of cosmic acceleration, predicted by an effective cosmographic
construction, in the framework of $f(T)$ gravity. In particular, employing
cosmography we obtain bounds on the viable $f(T)$ forms and their derivatives.
Since this procedur... | [
{
"created": "Tue, 10 Mar 2015 09:45:29 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2015 07:00:28 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We extract constraints on the transition redshift $z_{tr}$, determining the onset of cosmic acceleration, predicted by an effective cosmographic construction, in the framework of $f(T)$ gravity. In particular, employing cosmography we obtain bounds on the viable $f(T)$ forms and their derivatives. Since this procedure ... |
1904.02299 | Belinka Gonz\'alez-Fern\'andez Dr. | B. Gonz\'alez-Fern\'andez and A. Camacho | Accelerated observers emerging from a Bose-Einstein condensate through
analogue gravity | 13 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current article explores the problem of a Bose-Einstein condensate (BEC)
trapped in an anisotropic three-dimensional harmonic-oscillator potential, with
positive effective interatomic interactions, and the analogue gravity acoustic
metric emerging from it. We find that the latter gives rise to a family of
conform... | [
{
"created": "Thu, 4 Apr 2019 01:31:41 GMT",
"version": "v1"
}
] | 2019-04-05 | [
[
"González-Fernández",
"B.",
""
],
[
"Camacho",
"A.",
""
]
] | The current article explores the problem of a Bose-Einstein condensate (BEC) trapped in an anisotropic three-dimensional harmonic-oscillator potential, with positive effective interatomic interactions, and the analogue gravity acoustic metric emerging from it. We find that the latter gives rise to a family of conformal... |
gr-qc/0601084 | Serena Fagnocchi | S. Fagnocchi | Back-reaction effects in acoustic black holes | 10 pages, 1 figure; Talk given at the conference ``Constrained
Dynamics and Quantum Gravity (QG05)", Cala Gonone (Italy), September 2005 | J.Phys.Conf.Ser. 33 (2006) 445-450 | 10.1088/1742-6596/33/1/057 | null | gr-qc cond-mat.other hep-th | null | Acoustic black holes are very interesting non-gravitational objects which can
be described by the geometrical formalism of General Relativity. These models
can be useful to experimentally test effects otherwise undetectable, as for
example the Hawking radiation. The back-reaction effects on the background
quantities ... | [
{
"created": "Fri, 20 Jan 2006 14:28:42 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Fagnocchi",
"S.",
""
]
] | Acoustic black holes are very interesting non-gravitational objects which can be described by the geometrical formalism of General Relativity. These models can be useful to experimentally test effects otherwise undetectable, as for example the Hawking radiation. The back-reaction effects on the background quantities in... |
gr-qc/9905093 | Sibiryakov | V.A.Rubakov, S.M.Sibiryakov | False vacuum decay in de Sitter space-time | 26 pages,10 figures | Theor.Math.Phys. 120 (1999) 1194-1212; Teor.Mat.Fiz. 120 (1999)
451-472 | 10.1007/BF02557243 | null | gr-qc astro-ph hep-th | null | We suggest a technique that explicitly accounts for the structure of an
initial state of quantum field in the semiclassical calculations of path
integral in curved space-time, and consider decay of metastable state
(conformal vacuum of scalar particles above false classical vacuum) in
background de Sitter space-time ... | [
{
"created": "Tue, 25 May 1999 17:10:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Rubakov",
"V. A.",
""
],
[
"Sibiryakov",
"S. M.",
""
]
] | We suggest a technique that explicitly accounts for the structure of an initial state of quantum field in the semiclassical calculations of path integral in curved space-time, and consider decay of metastable state (conformal vacuum of scalar particles above false classical vacuum) in background de Sitter space-time as... |
1112.2955 | Elena Melkumova | E.Yu. Melkumova | Plasmon-graviton conversion in a magnetic field in TeV-scale gravity | Submitted to Proceedings of "RusGrav-14" International Conference,
27.06-02.07 2011, Ulyanovks, Russia | null | 10.1134/S0202289312010112 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kaluza-Klein (KK) gravitons emission rates due to plasmon-graviton conversion
in magnetic field are computed within the ADD model of TeV-scale gravity.
Plasma is described in the kinetic approach as the system of charged particles
and Maxwell field both confined on the brane. Interaction with multidimensional
gravity... | [
{
"created": "Tue, 13 Dec 2011 16:49:40 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Melkumova",
"E. Yu.",
""
]
] | Kaluza-Klein (KK) gravitons emission rates due to plasmon-graviton conversion in magnetic field are computed within the ADD model of TeV-scale gravity. Plasma is described in the kinetic approach as the system of charged particles and Maxwell field both confined on the brane. Interaction with multidimensional gravity l... |
gr-qc/9608040 | Yoav Peleg | Yoav Peleg, Sukanta Bose, and Leonard Parker (Univ. of Wisconsin,
Milwaukee) | Choptuik Scaling and Quantum Effects in 2D Dilaton Gravity | 11p RevTex version + 12p uuencoded gzip version including 3 figures | Phys.Rev.D55:4525-4528,1997 | 10.1103/PhysRevD.55.4525 | WISC-MILW-96-TH-22 | gr-qc hep-th | null | We study numerically the collapse of massless scalar fields in
two-dimensional dilaton gravity, both classically and semiclassically. At the
classical level, we find that the black hole mass scales at threshold like
$M_{\rm bh} \propto |p-p^*|^{\gamma}$, where $\gamma \simeq 0.53$. At the
semiclassical level, we find... | [
{
"created": "Fri, 16 Aug 1996 18:12:17 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Peleg",
"Yoav",
"",
"Univ. of Wisconsin,\n Milwaukee"
],
[
"Bose",
"Sukanta",
"",
"Univ. of Wisconsin,\n Milwaukee"
],
[
"Parker",
"Leonard",
"",
"Univ. of Wisconsin,\n Milwaukee"
]
] | We study numerically the collapse of massless scalar fields in two-dimensional dilaton gravity, both classically and semiclassically. At the classical level, we find that the black hole mass scales at threshold like $M_{\rm bh} \propto |p-p^*|^{\gamma}$, where $\gamma \simeq 0.53$. At the semiclassical level, we find t... |
gr-qc/0407099 | Timoshkin Alexandr V. | Alexandr V. Timoshkin | The asymptotic conformal invariance in Chern-Simons theory with matter
in curved space-time | null | TSPU Vestnik 44N7:57-59,2004 | null | null | gr-qc | null | We consider the asymptoic behaviour of the Chern - Simons (CS) theory with
matter in curved space - time. The asymptotics of effective couplings are
discussed.
| [
{
"created": "Tue, 27 Jul 2004 04:08:50 GMT",
"version": "v1"
}
] | 2009-02-25 | [
[
"Timoshkin",
"Alexandr V.",
""
]
] | We consider the asymptoic behaviour of the Chern - Simons (CS) theory with matter in curved space - time. The asymptotics of effective couplings are discussed. |
1905.04263 | Andrea Giusti | Andrea Giusti, Valerio Faraoni | Turnaround size of non-spherical structures | 10 pages, no figures | Physics of the Dark Universe 26 (2019) 100353 | 10.1016/j.dark.2019.100353 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The turnaround radius of a large structure in an accelerating universe has
been studied only for spherical structures, while real astronomical systems
deviate from spherical symmetry. We show that, for small deviations from
spherical symmetry, the gauge-invariant characterization of the turnaround size
using the Hawk... | [
{
"created": "Fri, 10 May 2019 17:07:52 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jul 2019 07:04:49 GMT",
"version": "v2"
}
] | 2019-07-16 | [
[
"Giusti",
"Andrea",
""
],
[
"Faraoni",
"Valerio",
""
]
] | The turnaround radius of a large structure in an accelerating universe has been studied only for spherical structures, while real astronomical systems deviate from spherical symmetry. We show that, for small deviations from spherical symmetry, the gauge-invariant characterization of the turnaround size using the Hawkin... |
2403.12555 | Pradip Kumar Chattopadhyay Dr. | Debadri Bhattacharjee and Pradip Kumar Chattopadhyay | Impact of non-zero strange quark mass $(m_{s}\neq0)$ in $f(R,T)$ gravity
admitting observational results of strange stars | 31 pages, 19 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this article we propose a new class of isotropic strange star using
Buchdahl-I metric ansatz in the context of MIT bag model equation of state
considering of non-zero strange quark mass $(m_{s})$ in the framework of
modified $f(R,T)$ theory of gravity. The barotropic form of MIT bag model
equation of state and a s... | [
{
"created": "Tue, 19 Mar 2024 08:59:13 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2024 08:09:11 GMT",
"version": "v2"
}
] | 2024-05-22 | [
[
"Bhattacharjee",
"Debadri",
""
],
[
"Chattopadhyay",
"Pradip Kumar",
""
]
] | In this article we propose a new class of isotropic strange star using Buchdahl-I metric ansatz in the context of MIT bag model equation of state considering of non-zero strange quark mass $(m_{s})$ in the framework of modified $f(R,T)$ theory of gravity. The barotropic form of MIT bag model equation of state and a spe... |
1409.0469 | Michel Tytgat | Guillaume Defillon, Etienne Granet, Petr Tinyakov and Michel H.G.
Tytgat | On tidal capture of primordial black holes by neutron stars | 7 pages | Phys. Rev. D 90, 103522 (2014) | 10.1103/PhysRevD.90.103522 | ULB-TH/14-13 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fraction of primordial black holes (PBHs) of masses $10^{17} - 10^{26}$ g
in the total amount of dark matter may be constrained by considering their
capture by neutron stars (NSs), which leads to the rapid destruction of the
latter. The constraints depend crucially on the capture rate which, in turn, is
determine... | [
{
"created": "Mon, 1 Sep 2014 16:20:10 GMT",
"version": "v1"
}
] | 2014-11-26 | [
[
"Defillon",
"Guillaume",
""
],
[
"Granet",
"Etienne",
""
],
[
"Tinyakov",
"Petr",
""
],
[
"Tytgat",
"Michel H. G.",
""
]
] | The fraction of primordial black holes (PBHs) of masses $10^{17} - 10^{26}$ g in the total amount of dark matter may be constrained by considering their capture by neutron stars (NSs), which leads to the rapid destruction of the latter. The constraints depend crucially on the capture rate which, in turn, is determined ... |
2007.00665 | Jose' P. S. Lemos | Jos\'e P. S. Lemos, Oleg B. Zaslavskii | Compact objects in general relativity: From Buchdahl stars to quasiblack
holes | 25 pages, 7 figures | International Journal of Modern Physics D 29, 2041019 (2020) | 10.1142/S0218271820410199 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Buchdahl star is a highly compact star for which the boundary radius $R$
obeys $R=\frac98 r_+$, where $r_+$ is the gravitational radius of the star
itself. A quasiblack hole is a maximum compact star, or more generically a
maximum compact object, for which the boundary radius $R$ obeys $R=r_+$.
Quasiblack holes are... | [
{
"created": "Wed, 1 Jul 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2020 16:19:24 GMT",
"version": "v2"
}
] | 2020-09-17 | [
[
"Lemos",
"José P. S.",
""
],
[
"Zaslavskii",
"Oleg B.",
""
]
] | A Buchdahl star is a highly compact star for which the boundary radius $R$ obeys $R=\frac98 r_+$, where $r_+$ is the gravitational radius of the star itself. A quasiblack hole is a maximum compact star, or more generically a maximum compact object, for which the boundary radius $R$ obeys $R=r_+$. Quasiblack holes are o... |
gr-qc/9512009 | Gregory B. Cook | Gregory B. Cook, Stuart L. Shapiro, Saul A. Teukolsky | Testing a Simplified Version of Einstein's Equations for Numerical
Relativity | 9 pages (RevTeX 3.0 with 6 uuencoded figures), CRSR-1079 | Phys.Rev. D53 (1996) 5533-5540 | 10.1103/PhysRevD.53.5533 | null | gr-qc | null | Solving dynamical problems in general relativity requires the full machinery
of numerical relativity. Wilson has proposed a simpler but approximate scheme
for systems near equilibrium, like binary neutron stars. We test the scheme on
isolated, rapidly rotating, relativistic stars. Since these objects are in
equilibri... | [
{
"created": "Tue, 5 Dec 1995 15:17:21 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Cook",
"Gregory B.",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | Solving dynamical problems in general relativity requires the full machinery of numerical relativity. Wilson has proposed a simpler but approximate scheme for systems near equilibrium, like binary neutron stars. We test the scheme on isolated, rapidly rotating, relativistic stars. Since these objects are in equilibrium... |
gr-qc/9401002 | Roh-Suan Tung | James M. Nester and Roh-Suan Tung | Another positivity proof and gravitational energy localizations | 14 pages REVTeX | Phys.Rev.D49:3958-3962,1994 | 10.1103/PhysRevD.49.3958 | null | gr-qc | null | Two locally positive expressions for the gravitational Hamiltonian, one using
4-spinors the other special orthonormal frames, are reviewed. A new quadratic
3-spinor-curvature identity is used to obtain another positive expression for
the Hamiltonian and thereby a localization of gravitational energy and positive
ener... | [
{
"created": "Fri, 7 Jan 1994 00:19:12 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Nester",
"James M.",
""
],
[
"Tung",
"Roh-Suan",
""
]
] | Two locally positive expressions for the gravitational Hamiltonian, one using 4-spinors the other special orthonormal frames, are reviewed. A new quadratic 3-spinor-curvature identity is used to obtain another positive expression for the Hamiltonian and thereby a localization of gravitational energy and positive energy... |
2311.17817 | Daniela Magos | Daniela Magos and Mauricio Bellini | Seminal Electromagnetic fields from preinflation | null | null | 10.1016/j.astropartphys.2024.103006 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the geometric dynamics of the primordial electric and magnetic
fields during the early stages of the universe by extending a recently
introduced quantum algebra \cite{BMM,BMAS}. We work on an extended model of
gravity that considers the boundary terms from the Einstein-Hilbert action as
geometric quant... | [
{
"created": "Wed, 29 Nov 2023 17:16:51 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jun 2024 18:22:09 GMT",
"version": "v2"
}
] | 2024-07-02 | [
[
"Magos",
"Daniela",
""
],
[
"Bellini",
"Mauricio",
""
]
] | We investigate the geometric dynamics of the primordial electric and magnetic fields during the early stages of the universe by extending a recently introduced quantum algebra \cite{BMM,BMAS}. We work on an extended model of gravity that considers the boundary terms from the Einstein-Hilbert action as geometric quantum... |
1805.08018 | Fabio Moretti | Giovanni Montani, Fabio Moretti | Modified Gravitational Waves Across Galaxies from Macroscopic Gravity | 10 pages, comments are welcome | Phys. Rev. D 100, 024045 (2019) | 10.1103/PhysRevD.100.024045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the propagation of gravitational waves in a medium containing
bounded subsystems ("molecules"), able to induce significant Macroscopic
Gravity effects. We establish a precise constitutive relation between the
average quadrupole and the amplitudes of a vacuum gravitational wave, via the
geodesic deviation e... | [
{
"created": "Mon, 21 May 2018 12:34:48 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jun 2019 09:37:36 GMT",
"version": "v2"
}
] | 2019-07-26 | [
[
"Montani",
"Giovanni",
""
],
[
"Moretti",
"Fabio",
""
]
] | We analyze the propagation of gravitational waves in a medium containing bounded subsystems ("molecules"), able to induce significant Macroscopic Gravity effects. We establish a precise constitutive relation between the average quadrupole and the amplitudes of a vacuum gravitational wave, via the geodesic deviation equ... |
gr-qc/9508022 | 3 | Donald E. Neville | Closure of Constraints for Plane Gravity Waves | 19 pages; LaTex | null | null | TU-8-95 | gr-qc | null | The metric for gravitational plane waves has very high symmetry (two
spacelike commuting Killing vectors). For this high symmetry, a simple
renormalization of the lapse function is found which allows the constraint
algebra for canonical quantum gravity to close; also, the vector constraint has
the correct form to gen... | [
{
"created": "Tue, 8 Aug 1995 21:00:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Neville",
"Donald E.",
""
]
] | The metric for gravitational plane waves has very high symmetry (two spacelike commuting Killing vectors). For this high symmetry, a simple renormalization of the lapse function is found which allows the constraint algebra for canonical quantum gravity to close; also, the vector constraint has the correct form to gener... |
1904.05363 | Vitor Cardoso | Vitor Cardoso, Paolo Pani | Testing the nature of dark compact objects: a status report | 76 pages + references. Invited review article for Living Reviews in
Relativity. v3: Overall improvements and references added, a few typos
corrected. Version to appear in LRR | Living Rev Relativ (2019) 22: 4 | 10.1007/s41114-019-0020-4 | null | gr-qc astro-ph.HE hep-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Very compact objects probe extreme gravitational fields and may be the key to
understand outstanding puzzles in fundamental physics. These include the nature
of dark matter, the fate of spacetime singularities, or the loss of unitarity
in Hawking evaporation. The standard astrophysical description of collapsing
objec... | [
{
"created": "Wed, 10 Apr 2019 18:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2019 08:38:13 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Jun 2019 08:23:28 GMT",
"version": "v3"
}
] | 2021-01-20 | [
[
"Cardoso",
"Vitor",
""
],
[
"Pani",
"Paolo",
""
]
] | Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. The standard astrophysical description of collapsing objects... |
2303.06788 | Eleni-Alexandra Kontou | Eleni-Alexandra Kontou and Veronica Sacchi | A generalization of the Hawking black hole area theorem | 25 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking's black hole area theorem was proven using the null energy condition
(NEC), a pointwise condition violated by quantum fields. The violation of the
NEC is usually cited as the reason that black hole evaporation is allowed in
the context of semiclassical gravity. Here we provide two generalizations of
the class... | [
{
"created": "Mon, 13 Mar 2023 00:24:02 GMT",
"version": "v1"
}
] | 2023-03-14 | [
[
"Kontou",
"Eleni-Alexandra",
""
],
[
"Sacchi",
"Veronica",
""
]
] | Hawking's black hole area theorem was proven using the null energy condition (NEC), a pointwise condition violated by quantum fields. The violation of the NEC is usually cited as the reason that black hole evaporation is allowed in the context of semiclassical gravity. Here we provide two generalizations of the classic... |
2107.10120 | Emanuel Gallo | Emanuel Gallo, Carlos Kozameh, Thomas M\"adler, Osvaldo M. Moreschi
and Alejandro P\'erez | Spherically symmetric black holes and affine-null metric formulation of
Einstein's equations | 17 pages | null | 10.1103/PhysRevD.104.084048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definition of well-behaved coordinate charts for black hole spacetimes
can be tricky, as they can lead for example to either unphysical coordinate
singularities in the metric (e.g. $r=2M$ in the Schwarzschild black hole) or to
an implicit dependence of the chosen coordinate to physical relevant
coordinates (e.g. ... | [
{
"created": "Wed, 21 Jul 2021 14:46:23 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Gallo",
"Emanuel",
""
],
[
"Kozameh",
"Carlos",
""
],
[
"Mädler",
"Thomas",
""
],
[
"Moreschi",
"Osvaldo M.",
""
],
[
"Pérez",
"Alejandro",
""
]
] | The definition of well-behaved coordinate charts for black hole spacetimes can be tricky, as they can lead for example to either unphysical coordinate singularities in the metric (e.g. $r=2M$ in the Schwarzschild black hole) or to an implicit dependence of the chosen coordinate to physical relevant coordinates (e.g. th... |
gr-qc/0403102 | Leonardo Fernandez-Jambrina | L. Fernandez-Jambrina, F.J. Chinea | Angular Momentum Surface Density of the Kerr Metric | 6 pages, LaTeX 2.09 | Phys.Rev.Lett. 71 (1993) 2521-2523 | 10.1103/PhysRevLett.71.2521 | null | gr-qc | null | A method for interpreting discontinuities of the twist potential of vacuum
stationary axisymmetric solutions of Einstein's equations is introduced.
Surface densities for the angular momentum of the source can be constructed
after solving a linear partial differential equation with boundary conditions
at infinity. Thi... | [
{
"created": "Thu, 25 Mar 2004 10:25:11 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Fernandez-Jambrina",
"L.",
""
],
[
"Chinea",
"F. J.",
""
]
] | A method for interpreting discontinuities of the twist potential of vacuum stationary axisymmetric solutions of Einstein's equations is introduced. Surface densities for the angular momentum of the source can be constructed after solving a linear partial differential equation with boundary conditions at infinity. This ... |
0812.4944 | Jiri Podolsky | Jiri Podolsky, Ondrej Prikryl | On conformally flat and type N pure radiation metrics | 13 pages, typos corrected. To appear in Gen. Relativ. Gravit | Gen.Relativ.Grav.41:1069, 2009 | 10.1007/s10714-008-0692-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study pure radiation spacetimes of algebraic types O and N with a possible
cosmological constant. In particular, we present explicit transformations which
put these metrics, that were recently re-derived by Edgar, Vickers and Machado
Ramos, into a general Ozsvath-Robinson-Rozga form. By putting all such metrics
in... | [
{
"created": "Mon, 29 Dec 2008 17:35:12 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jan 2009 10:22:20 GMT",
"version": "v2"
}
] | 2014-06-04 | [
[
"Podolsky",
"Jiri",
""
],
[
"Prikryl",
"Ondrej",
""
]
] | We study pure radiation spacetimes of algebraic types O and N with a possible cosmological constant. In particular, we present explicit transformations which put these metrics, that were recently re-derived by Edgar, Vickers and Machado Ramos, into a general Ozsvath-Robinson-Rozga form. By putting all such metrics into... |
1811.02931 | David McNutt | D. D. McNutt and A. A. Coley | Geometric Horizons in the Kastor-Traschen Multi Black Hole Solutions | 24 pages, 17 figures | Physical Review D, 98, 064043 (2018) | 10.1103/PhysRevD.98.064043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the existence of invariantly defined quasi-local hypersurfaces
in the Kastor-Traschen solution containing $N$ charge-equal-to-mass black
holes. These hypersurfaces are characterized by the vanishing of particular
curvature invariants, known as Cartan invariants, which are generated using the
frame appr... | [
{
"created": "Wed, 7 Nov 2018 15:26:24 GMT",
"version": "v1"
}
] | 2018-11-08 | [
[
"McNutt",
"D. D.",
""
],
[
"Coley",
"A. A.",
""
]
] | We investigate the existence of invariantly defined quasi-local hypersurfaces in the Kastor-Traschen solution containing $N$ charge-equal-to-mass black holes. These hypersurfaces are characterized by the vanishing of particular curvature invariants, known as Cartan invariants, which are generated using the frame approa... |
1603.00712 | Roberto Emparan | Roberto Emparan, Marina Martinez | Exact Event Horizon of a Black Hole Merger | 21 pages, 17 figures. v2: Improved perturbative and critical
analysis. Ancillary 3D animation of the merger. 24 pages, 18 figures. v3:
minor improvements. 25 pages, 18 figures | Class.Quant.Grav. 33 (2016) 15, 155003 | 10.1088/0264-9381/33/15/155003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the event horizon of a binary black hole merger, in the
extreme-mass-ratio limit where one of the black holes is much smaller than the
other, can be described in an exact analytic way. This is done by tracing in
the Schwarzschild geometry a congruence of null geodesics that approaches a
null plane at in... | [
{
"created": "Wed, 2 Mar 2016 13:52:22 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Mar 2016 15:03:40 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Jun 2016 18:16:46 GMT",
"version": "v3"
}
] | 2022-03-07 | [
[
"Emparan",
"Roberto",
""
],
[
"Martinez",
"Marina",
""
]
] | We argue that the event horizon of a binary black hole merger, in the extreme-mass-ratio limit where one of the black holes is much smaller than the other, can be described in an exact analytic way. This is done by tracing in the Schwarzschild geometry a congruence of null geodesics that approaches a null plane at infi... |
1604.00899 | Subhajit Saha | Subhajit Saha and Anindita Mondal | Thermodynamic implications of the gravitationally induced particle
creation scenario | 7 pages, 1 figure, 1 table; v2: Minor changes in format and style;
v3: Typos corrected, Identical to published version | The European Physical Journal C 77, 196 (2017); Erratum: The
European Physical Journal C 78, 295 (2018) | 10.1140/epjc/s10052-017-4746-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A rigorous thermodynamic analysis has been done at the apparent horizon of a
spatially flat Friedmann-Lemaitre-Robertson-Walker universe for the
gravitationally induced particle creation scenario with constant specific
entropy and an arbitrary particle creation rate $\Gamma$. Assuming a perfect
fluid equation of stat... | [
{
"created": "Fri, 1 Apr 2016 06:49:29 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2016 09:08:20 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Mar 2017 10:27:29 GMT",
"version": "v3"
}
] | 2019-10-24 | [
[
"Saha",
"Subhajit",
""
],
[
"Mondal",
"Anindita",
""
]
] | A rigorous thermodynamic analysis has been done at the apparent horizon of a spatially flat Friedmann-Lemaitre-Robertson-Walker universe for the gravitationally induced particle creation scenario with constant specific entropy and an arbitrary particle creation rate $\Gamma$. Assuming a perfect fluid equation of state ... |
gr-qc/9602019 | Donald Marolf | Donald Marolf | Path Integrals and Instantons in Quantum Gravity | 23 pages, ReVTeX, minor changes: clarifying Comments and references
added | Phys.Rev.D53:6979-6990,1996 | 10.1103/PhysRevD.53.6979 | UCSBTH-96-01 | gr-qc hep-th | null | While there does not at this time exist a complete canonical theory of full
3+1 quantum gravity, there does appear to be a satisfactory canonical
quantization of minisuperspace models. The method requires no `choice of time
variable' and preserves the systems' explicit reparametrization invariance. In
the following s... | [
{
"created": "Mon, 12 Feb 1996 01:02:32 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Feb 1996 01:06:40 GMT",
"version": "v2"
}
] | 2011-09-09 | [
[
"Marolf",
"Donald",
""
]
] | While there does not at this time exist a complete canonical theory of full 3+1 quantum gravity, there does appear to be a satisfactory canonical quantization of minisuperspace models. The method requires no `choice of time variable' and preserves the systems' explicit reparametrization invariance. In the following stu... |
2203.14599 | Alexey Toporensky | N. Avdeev and A. Toporensky | Ruling out an inflation driven by a power law potential: kinetic
coupling does not help | 4 pages with 1 eps figure; title and abstract have been changed to
better match with the result obtained; to appear in Gravitation and Cosmology | null | 10.1134/S0202289322040028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the latest constraints on inflationary observables,
namely the tensor-to-scalar ratio $r$ and the scalar spectral index $n_{_S}$,
from the Cosmic Background Radiation (CMB) observations are already strong
enough to rule out the model of a scalar field with a power law potential even
in the presenc... | [
{
"created": "Mon, 28 Mar 2022 09:19:59 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2022 15:52:45 GMT",
"version": "v2"
},
{
"created": "Sat, 15 Oct 2022 07:51:20 GMT",
"version": "v3"
}
] | 2022-12-07 | [
[
"Avdeev",
"N.",
""
],
[
"Toporensky",
"A.",
""
]
] | We demonstrate that the latest constraints on inflationary observables, namely the tensor-to-scalar ratio $r$ and the scalar spectral index $n_{_S}$, from the Cosmic Background Radiation (CMB) observations are already strong enough to rule out the model of a scalar field with a power law potential even in the presence ... |
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