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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0704.0048 | Alexander Stroeer | Alexander Stroeer, John Veitch, Christian Roever, Ed Bloomer, James
Clark, Nelson Christensen, Martin Hendry, Chris Messenger, Renate Meyer,
Matthew Pitkin, Jennifer Toher, Richard Umstaetter, Alberto Vecchio and
Graham Woan | Inference on white dwarf binary systems using the first round Mock LISA
Data Challenges data sets | GWDAW-11 proceeding, submitted to CQG, 10 pages, 3 figures, 1 table;
revised values in table | Class.Quant.Grav.24:S541-S550,2007 | 10.1088/0264-9381/24/19/S17 | null | gr-qc astro-ph | null | We report on the analysis of selected single source data sets from the first
round of the Mock LISA Data Challenges (MLDC) for white dwarf binaries. We
implemented an end-to-end pipeline consisting of a grid-based coherent
pre-processing unit for signal detection, and an automatic Markov Chain Monte
Carlo post-proces... | [
{
"created": "Sat, 31 Mar 2007 19:17:47 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2007 22:26:37 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Stroeer",
"Alexander",
""
],
[
"Veitch",
"John",
""
],
[
"Roever",
"Christian",
""
],
[
"Bloomer",
"Ed",
""
],
[
"Clark",
"James",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Hendry",
"Martin",
""
],
[
... | We report on the analysis of selected single source data sets from the first round of the Mock LISA Data Challenges (MLDC) for white dwarf binaries. We implemented an end-to-end pipeline consisting of a grid-based coherent pre-processing unit for signal detection, and an automatic Markov Chain Monte Carlo post-processi... |
2407.03775 | Orlando Luongo | Alessio Belfiglio, S. Mahesh Chandran, Orlando Luongo, Stefano Mancini | Horizon entanglement area law from regular black hole thermodynamics | 14 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the thermodynamics of regular black hole configurations via
quantum analogs of entropy and energy -- namely, the entanglement entropy and
entanglement energy -- near the event horizon of Bardeen and Hayward black
holes. Following standard approaches, we introduce a quantum scalar field
propagating in s... | [
{
"created": "Thu, 4 Jul 2024 09:34:41 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"Belfiglio",
"Alessio",
""
],
[
"Chandran",
"S. Mahesh",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Mancini",
"Stefano",
""
]
] | We investigate the thermodynamics of regular black hole configurations via quantum analogs of entropy and energy -- namely, the entanglement entropy and entanglement energy -- near the event horizon of Bardeen and Hayward black holes. Following standard approaches, we introduce a quantum scalar field propagating in suc... |
1209.3567 | Nami Uchikata | Nami Uchikata, Shijun Yoshida, and Toshifumi Futamase | New solutions of charged regular black holes and their stability | 11 pages, 8 figures, to be published in Physical Review D | null | 10.1103/PhysRevD.86.084025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct new regular black hole solutions by matching the de Sitter
solution and the Reissner-Nordstrom solution with a timelike thin shell. The
thin shell is assumed to have mass but no pressure and obeys an equation of
motion derived from Israel's junction conditions. By investigating the equation
of motion for... | [
{
"created": "Mon, 17 Sep 2012 07:46:13 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Uchikata",
"Nami",
""
],
[
"Yoshida",
"Shijun",
""
],
[
"Futamase",
"Toshifumi",
""
]
] | We construct new regular black hole solutions by matching the de Sitter solution and the Reissner-Nordstrom solution with a timelike thin shell. The thin shell is assumed to have mass but no pressure and obeys an equation of motion derived from Israel's junction conditions. By investigating the equation of motion for t... |
1905.08648 | Ritabrata Biswas | Amritendu Haldar and Ritabrata Biswas | Thermodynamics of $d$-Dimensional Charged AdS (Anti-de Sitter) Black
Holes: Hamiltonian Approach and Clapeyron Equation | 16 pages, 9 figures | Modern Physics Letters A Modern Physics Letters A Vol. 34 (2019)
1950170 | 10.1142/S0217732319501700 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of thermodynamics in the view of the Hamiltonian approach is a
newest tool to analyze the thermodynamic properties of the black holes. In this
letter, we investigate the thermodynamics of $d$-dimensional ($d>3$)
asymptotically AntideSitter black holes. A thermodynamic representation based
on symplectic geom... | [
{
"created": "Sun, 19 May 2019 14:19:19 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Haldar",
"Amritendu",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | The study of thermodynamics in the view of the Hamiltonian approach is a newest tool to analyze the thermodynamic properties of the black holes. In this letter, we investigate the thermodynamics of $d$-dimensional ($d>3$) asymptotically AntideSitter black holes. A thermodynamic representation based on symplectic geomet... |
2012.02348 | Joshua Foo | Joshua Foo, Michael R.R. Good, Robert B. Mann | Analog Particle Production Model for General Classes of Taub-NUT Black
Holes | 9+3 pages, 14 figures | Universe 2021, 7(9), 350 | 10.3390/universe7090350 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We derive a correspondence between the Hawking radiation spectra emitted from
general classes of Taub-NUT black holes with that induced by the relativistic
motion of an accelerated Dirichlet boundary condition (i.e.\ a perfectly
reflecting mirror) in (1+1)-dimensional flat spacetime. We demonstrate that the
particle ... | [
{
"created": "Fri, 4 Dec 2020 00:57:29 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Nov 2021 22:36:35 GMT",
"version": "v2"
}
] | 2021-11-17 | [
[
"Foo",
"Joshua",
""
],
[
"Good",
"Michael R. R.",
""
],
[
"Mann",
"Robert B.",
""
]
] | We derive a correspondence between the Hawking radiation spectra emitted from general classes of Taub-NUT black holes with that induced by the relativistic motion of an accelerated Dirichlet boundary condition (i.e.\ a perfectly reflecting mirror) in (1+1)-dimensional flat spacetime. We demonstrate that the particle an... |
1704.02280 | Majid Abdollahi Zadeh | M. Abdollahi Zadeh, A. Sheykhi, H. Moradpour | Ghost dark energy with sign-changeable interaction term | 15 pages, 16 figures | Int J Theor Phys 56 (2017) 3477 | 10.1007/s10773-017-3513-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Regarding the Veneziano ghost of QCD and its generalized form, we consider a
Friedmann-Robertson-Walker (FRW) universe filled by a pressureless matter and a
dark energy component interacting with each other through a mutual
sign-changeable interaction of positive coupling constant. Our study shows
that, at the late t... | [
{
"created": "Fri, 7 Apr 2017 16:22:55 GMT",
"version": "v1"
}
] | 2018-04-10 | [
[
"Zadeh",
"M. Abdollahi",
""
],
[
"Sheykhi",
"A.",
""
],
[
"Moradpour",
"H.",
""
]
] | Regarding the Veneziano ghost of QCD and its generalized form, we consider a Friedmann-Robertson-Walker (FRW) universe filled by a pressureless matter and a dark energy component interacting with each other through a mutual sign-changeable interaction of positive coupling constant. Our study shows that, at the late tim... |
2407.19738 | Vishva Patel | Divyesh P. Viththani (1), Tapobroto Bhanja (1), Vishva Patel (1) and
Pankaj S. Joshi (2) ((1) PDPIAS, Charusat University, Anand, Guj, India, (2)
International Centre for Space and Cosmology, Ahmedabad University,
Ahmedabad, GUJ, India) | Magnetic Penrose Process and Kerr Black Hole Mimickers | 12 pages, 5 figures and 2 tables (comments are welcome!) | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The present study investigates the negative energy orbits and energy
extraction efficiency using the magnetic Penrose process in various regular
black hole geometries surrounded by electromagnetic fields. Utilizing numerical
simulations, we analyze the efficiency of this process in Kerr and
Simpson-Visser geometries,... | [
{
"created": "Mon, 29 Jul 2024 07:02:37 GMT",
"version": "v1"
}
] | 2024-07-30 | [
[
"Viththani",
"Divyesh P.",
""
],
[
"Bhanja",
"Tapobroto",
""
],
[
"Patel",
"Vishva",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | The present study investigates the negative energy orbits and energy extraction efficiency using the magnetic Penrose process in various regular black hole geometries surrounded by electromagnetic fields. Utilizing numerical simulations, we analyze the efficiency of this process in Kerr and Simpson-Visser geometries, f... |
gr-qc/9805075 | Diego Torres | Diego F. Torres, Gustavo E. Romero and Luis A. Anchordoqui | Wormholes, Gamma Ray Bursts and the Amount of Negative Mass in the
Universe | Essay awarded ``Honorable Mention'' in the Gravity Foundation
Research Awards, 1998 | Mod.Phys.Lett.A13:1575-1582,1998 | 10.1142/S0217732398001650 | null | gr-qc | null | In this essay, we assume that negative mass objects can exist in the
extragalactic space and analyze the consequences of their microlensing on light
from distant Active Galactic Nuclei. We find that such events have very similar
features to some observed Gamma Ray Bursts and use recent satellite data to set
an upper ... | [
{
"created": "Tue, 19 May 1998 16:36:31 GMT",
"version": "v1"
}
] | 2010-12-03 | [
[
"Torres",
"Diego F.",
""
],
[
"Romero",
"Gustavo E.",
""
],
[
"Anchordoqui",
"Luis A.",
""
]
] | In this essay, we assume that negative mass objects can exist in the extragalactic space and analyze the consequences of their microlensing on light from distant Active Galactic Nuclei. We find that such events have very similar features to some observed Gamma Ray Bursts and use recent satellite data to set an upper bo... |
gr-qc/9911077 | Angelo Loinger | A.Loinger (Dipartimento di Fisica, Universita' di Milano, Italy) | On Kerr's corpuscle | 4 pages, PDF from MS-Word97, submitted to Il Nuovo Cimento, Section
B, pag.1 first row after eq.(1): replaced "a and r are nonnegative
parameters" with "a and M are nonnegative parameters" | null | null | null | gr-qc astro-ph | null | Simple changes of the radial co-ordinate deprive Kerr's spinning corpuscle of
its marvellous properties.
| [
{
"created": "Sat, 20 Nov 1999 13:38:20 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2000 09:44:35 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Loinger",
"A.",
"",
"Dipartimento di Fisica, Universita' di Milano, Italy"
]
] | Simple changes of the radial co-ordinate deprive Kerr's spinning corpuscle of its marvellous properties. |
gr-qc/0503068 | Yury Eroshenko | Victor Berezin, Vyacheslav Dokuchaev, Yury Eroshenko, Alexei Smirnov | Phantom shell around black hole and global geometry | null | Class.Quant.Grav. 22 (2005) 4443-4456 | 10.1088/0264-9381/22/21/003 | null | gr-qc | null | We describe the possible scenarios for the evolution of a thin spherically
symmetric self-gravitating phantom shell around the Schwarzschild black hole.
The general equations describing the motion of the shell with a general form of
equation of state are derived and analyzed. The different types of space-time
R- and ... | [
{
"created": "Wed, 16 Mar 2005 14:27:51 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Berezin",
"Victor",
""
],
[
"Dokuchaev",
"Vyacheslav",
""
],
[
"Eroshenko",
"Yury",
""
],
[
"Smirnov",
"Alexei",
""
]
] | We describe the possible scenarios for the evolution of a thin spherically symmetric self-gravitating phantom shell around the Schwarzschild black hole. The general equations describing the motion of the shell with a general form of equation of state are derived and analyzed. The different types of space-time R- and T-... |
2003.08088 | Aharon Davidson | Aharon Davidson and Tomer Ygael | Ricci linear Weyl/Maxwell mutual sourcing | Essay awarded Honorable Mention by the Gravity Research Foundation
2020. v.2 Title shorten, abstract modified to include the co-scalar VEV | Universe 6, 151 (2020) | 10.3390/Universe6090151 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elevate the field theoretical similarities between Maxwell and Weyl vector
fields into a full local scale/gauge invariant Weyl/Maxwell mutual sourcing
theory. In its preliminary form, and exclusively in four dimensions, the
associated Lagrangian is dynamical scalar field free, hosts no fermion matter
fields, and H... | [
{
"created": "Wed, 18 Mar 2020 08:32:50 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2020 18:50:37 GMT",
"version": "v2"
}
] | 2020-09-16 | [
[
"Davidson",
"Aharon",
""
],
[
"Ygael",
"Tomer",
""
]
] | We elevate the field theoretical similarities between Maxwell and Weyl vector fields into a full local scale/gauge invariant Weyl/Maxwell mutual sourcing theory. In its preliminary form, and exclusively in four dimensions, the associated Lagrangian is dynamical scalar field free, hosts no fermion matter fields, and Hol... |
1410.5608 | Norbert Bodendorfer | Norbert Bodendorfer | A quantum reduction to Bianchi I models in loop quantum gravity | 5 pages. v2: partly rewritten to clarify derivation, gauge group
enlarged from U(1) to R_Bohr, relation to old and new LQC dynamics discussed,
previous results unchanged. v3: journal version, minor clarifications | Phys. Rev. D 91, 081502 (2015) | 10.1103/PhysRevD.91.081502 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a quantum symmetry reduction of loop quantum gravity to Bianchi I
spacetimes. To this end, we choose the diagonal metric gauge for the spatial
diffeomorphism constraint at the classical level, leading to an
$\mathbb{R}_{\text{Bohr}}$ gauge theory, and quantise the resulting theory via
loop quantum gravity ... | [
{
"created": "Tue, 21 Oct 2014 10:27:25 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Dec 2014 09:42:41 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Apr 2015 07:21:53 GMT",
"version": "v3"
}
] | 2015-04-16 | [
[
"Bodendorfer",
"Norbert",
""
]
] | We propose a quantum symmetry reduction of loop quantum gravity to Bianchi I spacetimes. To this end, we choose the diagonal metric gauge for the spatial diffeomorphism constraint at the classical level, leading to an $\mathbb{R}_{\text{Bohr}}$ gauge theory, and quantise the resulting theory via loop quantum gravity me... |
2111.03667 | Nuno M. Santos | Carlos A. R. Herdeiro, Eugen Radu, Nuno M. Santos | A bound on energy extraction (and hairiness) from superradiance | 11 pages, 4 figures, 2 tables. Comments are welcome | null | 10.1016/j.physletb.2021.136835 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of mining the rotational energy from black holes has
far--reaching implications. Such energy extraction could occur even for
isolated black holes, if hypothetical ultralight bosonic particles exist in
Nature, leading to a new equilibrium state $-$ a black hole with synchronised
bosonic hair $-$ whose ... | [
{
"created": "Fri, 5 Nov 2021 18:00:00 GMT",
"version": "v1"
}
] | 2021-12-15 | [
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Radu",
"Eugen",
""
],
[
"Santos",
"Nuno M.",
""
]
] | The possibility of mining the rotational energy from black holes has far--reaching implications. Such energy extraction could occur even for isolated black holes, if hypothetical ultralight bosonic particles exist in Nature, leading to a new equilibrium state $-$ a black hole with synchronised bosonic hair $-$ whose li... |
1904.05056 | Abhishek Parida | Abhishek Parida, Jishnu Suresh, Sanjit Mitra, Sanjay Jhingan | Component separation map-making for stochastic gravitational wave
background | 20 pages, 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superposition of unresolved sources of gravitational waves (GW) is expected
to create a persistent background of stochastic gravitational wave background
(SGWB). Different types of astrophysical and cosmological sources are however
likely to be present in the background. We present an algorithm for separation
of the ... | [
{
"created": "Wed, 10 Apr 2019 08:24:45 GMT",
"version": "v1"
}
] | 2019-04-11 | [
[
"Parida",
"Abhishek",
""
],
[
"Suresh",
"Jishnu",
""
],
[
"Mitra",
"Sanjit",
""
],
[
"Jhingan",
"Sanjay",
""
]
] | Superposition of unresolved sources of gravitational waves (GW) is expected to create a persistent background of stochastic gravitational wave background (SGWB). Different types of astrophysical and cosmological sources are however likely to be present in the background. We present an algorithm for separation of the co... |
1704.07107 | Vinod Dagwal | V. J. Dagwal and D. D. Pawar | Tilted Two Fluids Cosmological Models with Variable G and {\Lambda} In
General Relativity | 13 pages | International Journal of Mathematical Archive-9(2), 2018, 120-128 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tilted two fluids cosmological models with variable G and {\Lambda} In
General Relativity are presented. Here one fluid is matter field modelling
material content of the universe and another fluid is radiation field modelling
the cosmic microwave background (CMB). The tiltedness is also considered .To
get the determi... | [
{
"created": "Mon, 24 Apr 2017 09:28:01 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Apr 2018 08:43:39 GMT",
"version": "v2"
}
] | 2018-04-26 | [
[
"Dagwal",
"V. J.",
""
],
[
"Pawar",
"D. D.",
""
]
] | Tilted two fluids cosmological models with variable G and {\Lambda} In General Relativity are presented. Here one fluid is matter field modelling material content of the universe and another fluid is radiation field modelling the cosmic microwave background (CMB). The tiltedness is also considered .To get the determini... |
gr-qc/0003100 | Jose Geraldo Pereira | V. C. de Andrade, L. C. T. Guillen and J. G. Pereira | Gravitational Energy-Momentum Density in Teleparallel Gravity | RevTeX, 4 pages, no figures, to appear in Phys. Rev. Lett | Phys.Rev.Lett. 84 (2000) 4533-4536 | 10.1103/PhysRevLett.84.4533 | IFT-P.032/2000 | gr-qc hep-th | null | In the context of a gauge theory for the translation group, a conserved
energy-momentum gauge current for the gravitational field is obtained. It is a
true spacetime and gauge tensor, and transforms covariantly under global
Lorentz transformations. By rewriting the gauge gravitational field equation in
a purely space... | [
{
"created": "Mon, 27 Mar 2000 17:43:39 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"de Andrade",
"V. C.",
""
],
[
"Guillen",
"L. C. T.",
""
],
[
"Pereira",
"J. G.",
""
]
] | In the context of a gauge theory for the translation group, a conserved energy-momentum gauge current for the gravitational field is obtained. It is a true spacetime and gauge tensor, and transforms covariantly under global Lorentz transformations. By rewriting the gauge gravitational field equation in a purely spaceti... |
gr-qc/9804088 | Don N. Page | Don N. Page (Canadian Institute for Advanced Research and Theoretical
Physics Institute, University of Alberta, Edmonton, Canada) | Gravitational Capture and Scattering of Straight Test Strings with Large
Impact Parameters | 27 pages, no figures, Latex | Phys. Rev. D 58, 105026 (1998) | 10.1103/PhysRevD.58.105026 | Alberta-Thy-05-98 | gr-qc | null | The capture or scattering of an initially straight infinite test cosmic
string by a Kerr-Newman black hole, or by any other small source of an
electrovac gravitational field, is analyzed analytically when the string moves
with initial velocity v and large impact parameter b >> M so that the string
stays very nearly s... | [
{
"created": "Thu, 30 Apr 1998 23:36:32 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Page",
"Don N.",
"",
"Canadian Institute for Advanced Research and Theoretical\n Physics Institute, University of Alberta, Edmonton, Canada"
]
] | The capture or scattering of an initially straight infinite test cosmic string by a Kerr-Newman black hole, or by any other small source of an electrovac gravitational field, is analyzed analytically when the string moves with initial velocity v and large impact parameter b >> M so that the string stays very nearly str... |
1105.3312 | Eduardo Guendelman I | E. I. Guendelman | Non Singular Origin of the Universe and the Cosmological Constant
Problem (CCP) | awarded an honorable mention in the Gravity Research Foundation 2011
Awards for Essays in Gravitation for 2011 | null | 10.1142/S0218271811020718 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a non singular origin for the Universe starting from an Einstein
static Universe in the framework of a theory which uses two volume elements
$\sqrt{-{g}}d^{4}x$ and $\Phi d^{4}x$, where $\Phi $ is a metric independent
density, also curvature, curvature square terms, first order formalism and for
scale inv... | [
{
"created": "Tue, 17 May 2011 09:19:41 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Guendelman",
"E. I.",
""
]
] | We consider a non singular origin for the Universe starting from an Einstein static Universe in the framework of a theory which uses two volume elements $\sqrt{-{g}}d^{4}x$ and $\Phi d^{4}x$, where $\Phi $ is a metric independent density, also curvature, curvature square terms, first order formalism and for scale invar... |
2207.01654 | Koustav Chandra | Koustav Chandra, Juan Calder\'on Bustillo, Archana Pai, Ian Harry | First gravitational-wave search for intermediate-mass black hole mergers
with higher order harmonics | 15 pages, 8 figures, matches published version | null | 10.1103/PhysRevD.106.123003 | LIGO-P2200182 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Current matched-filter searches for gravitational waves from binary
black-hole mergers compare the calibrated detector data to waveform templates
that omit the higher-order mode content of the signals predicted by General
Relativity. However, higher-order emission modes become important for highly
inclined asymmetric... | [
{
"created": "Mon, 4 Jul 2022 18:08:37 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2022 04:26:00 GMT",
"version": "v2"
}
] | 2022-12-14 | [
[
"Chandra",
"Koustav",
""
],
[
"Bustillo",
"Juan Calderón",
""
],
[
"Pai",
"Archana",
""
],
[
"Harry",
"Ian",
""
]
] | Current matched-filter searches for gravitational waves from binary black-hole mergers compare the calibrated detector data to waveform templates that omit the higher-order mode content of the signals predicted by General Relativity. However, higher-order emission modes become important for highly inclined asymmetric s... |
0810.4022 | Xin-Zhou Li | Ping Xi | Quasinormal modes of a black hole with quintessence-like matter and a
deficit solid angle: scalar and gravitational perturbations | 5pages | Astrophys.Space Sci.321:47-51,2009 | 10.1007/s10509-009-9994-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the previous paper (Li, X. Z., Xi, P., Zhai, X. H.: Phys. Lett. B{\bf666},
125-130 (2008)), we show the solutions of Einstein equations with static
spherically-symmetric quintessence-like matter surrounding a global monopole.
Furthermore, this monopole become a black hole with quintessence-like matter
and a defici... | [
{
"created": "Wed, 22 Oct 2008 09:54:56 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 2009 02:59:35 GMT",
"version": "v2"
}
] | 2009-06-04 | [
[
"Xi",
"Ping",
""
]
] | In the previous paper (Li, X. Z., Xi, P., Zhai, X. H.: Phys. Lett. B{\bf666}, 125-130 (2008)), we show the solutions of Einstein equations with static spherically-symmetric quintessence-like matter surrounding a global monopole. Furthermore, this monopole become a black hole with quintessence-like matter and a deficit ... |
2003.05318 | Joe Kennedy Dr | Joe Kennedy, Lucas Lombriser | Positivity bounds on reconstructed Horndeski models | 11 pages, 3 figures | Phys. Rev. D 102, 044062 (2020) | 10.1103/PhysRevD.102.044062 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Positivity bounds provide conditions that a consistent UV-completion exists
for a quantum field theory. We examine their application to Horndeski gravity
models reconstructed from the effective field theory (EFT) of dark energy. This
enables us to assess whether particular phenomenological parameterizations of
the EF... | [
{
"created": "Tue, 10 Mar 2020 15:54:34 GMT",
"version": "v1"
}
] | 2020-09-09 | [
[
"Kennedy",
"Joe",
""
],
[
"Lombriser",
"Lucas",
""
]
] | Positivity bounds provide conditions that a consistent UV-completion exists for a quantum field theory. We examine their application to Horndeski gravity models reconstructed from the effective field theory (EFT) of dark energy. This enables us to assess whether particular phenomenological parameterizations of the EFT ... |
1509.06491 | Somenath Chakrabarty | Sanchari De and Somenath Chakrabarty | Wien's Displacement Law in Rindler Space | 9 Pages REVTEX file, a new section is added, conclusion part is
rewritten | null | null | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we have developed the formalisms for the modified form of
Wien displacement laws for both the gas of electromagnetic waves and a gas of
de Broglie waves in Rindler space. In the case of de Broglie waves we assume
both fermion type and boson type materials. Following the classic work of Wien,
we assume... | [
{
"created": "Tue, 22 Sep 2015 08:08:14 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2016 11:40:35 GMT",
"version": "v2"
}
] | 2016-08-12 | [
[
"De",
"Sanchari",
""
],
[
"Chakrabarty",
"Somenath",
""
]
] | In this article we have developed the formalisms for the modified form of Wien displacement laws for both the gas of electromagnetic waves and a gas of de Broglie waves in Rindler space. In the case of de Broglie waves we assume both fermion type and boson type materials. Following the classic work of Wien, we assume t... |
gr-qc/0501002 | Gamal Nashed G. L. | Gamal G.L. Nashed | Charged Axially Symmetric Solution, Energy and Angular Momentum in
Tetrad Theory of Gravitation | LaTex file, 16 pages. accepted for publication in Modern physics
letter A | Int.J.Mod.Phys.A21:3181-3197,2006 | 10.1142/S0217751X06031478 | null | gr-qc | null | Charged axially symmetric solution of the coupled gravitational and
electromagnetic fields in the tetrad theory of gravitation is derived. The
metric associated with this solution is an axially symmetric metric which is
characterized by three parameters ``$ $the gravitational mass $M$, the charge
parameter $Q$ and th... | [
{
"created": "Sat, 1 Jan 2005 11:17:33 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2005 11:49:35 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Nashed",
"Gamal G. L.",
""
]
] | Charged axially symmetric solution of the coupled gravitational and electromagnetic fields in the tetrad theory of gravitation is derived. The metric associated with this solution is an axially symmetric metric which is characterized by three parameters ``$ $the gravitational mass $M$, the charge parameter $Q$ and the ... |
gr-qc/9307018 | null | Chopin Soo and Lay Nam Chang | Superspace Dynamics and Perturbations Around "Emptiness" | 16 pages.(Revised 9/93) Preprint VPI-IHEP-93-5, CGPG-93/9-2,
gr-qc/9307018 | Int.J.Mod.Phys.D3:529-544,1994 | 10.1142/S021827189400068X | null | gr-qc hep-th | null | Superspace parametrized by gauge potentials instead of metric
three-geometries is discussed in the context of the Ashtekar variables. Among
other things, an "internal clock" for the full theory can be identified.
Gauge-fixing conditions which lead to the natural geometrical separation of
physical from gauge modes are... | [
{
"created": "Wed, 14 Jul 1993 19:59:20 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 1993 17:27:55 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Soo",
"Chopin",
""
],
[
"Chang",
"Lay Nam",
""
]
] | Superspace parametrized by gauge potentials instead of metric three-geometries is discussed in the context of the Ashtekar variables. Among other things, an "internal clock" for the full theory can be identified. Gauge-fixing conditions which lead to the natural geometrical separation of physical from gauge modes are d... |
1303.6824 | Tapobrata Sarkar | Anshuman Dey, Pratim Roy, Tapobrata Sarkar | Scalar Radiation in the Background of a Naked Singularity | 1 + 15 Pages, LaTeX, 6 .eps figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scalar radiation spectra from a particle in circular orbit, in the
background of the Janis-Newman-Winicour (JNW) naked singularity. The
differences in the nature of the spectra, from what one obtains with a
Schwarzschild black hole, is established. We also compute the angular
distribution of the spectra.
| [
{
"created": "Wed, 27 Mar 2013 13:30:40 GMT",
"version": "v1"
}
] | 2013-03-28 | [
[
"Dey",
"Anshuman",
""
],
[
"Roy",
"Pratim",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | We study scalar radiation spectra from a particle in circular orbit, in the background of the Janis-Newman-Winicour (JNW) naked singularity. The differences in the nature of the spectra, from what one obtains with a Schwarzschild black hole, is established. We also compute the angular distribution of the spectra. |
1105.6296 | Jurjen Koksma | Jurjen F. Koksma, Tomislav Prokopec | The Cosmological Constant and Lorentz Invariance of the Vacuum State | null | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One hope to solve the cosmological constant problem is to identify a symmetry
principle, based on which the cosmological constant can be reduced either to
zero, or to a tiny value. Here, we note that requiring that the vacuum state is
Lorentz invariant significantly reduces the theoretical value of the vacuum
energy ... | [
{
"created": "Tue, 31 May 2011 14:20:29 GMT",
"version": "v1"
}
] | 2011-06-01 | [
[
"Koksma",
"Jurjen F.",
""
],
[
"Prokopec",
"Tomislav",
""
]
] | One hope to solve the cosmological constant problem is to identify a symmetry principle, based on which the cosmological constant can be reduced either to zero, or to a tiny value. Here, we note that requiring that the vacuum state is Lorentz invariant significantly reduces the theoretical value of the vacuum energy de... |
gr-qc/9703036 | Alan Rendall | Alan D. Rendall | Global dynamics of the mixmaster model | 16 pages | Class.Quant.Grav. 14 (1997) 2341-2356 | 10.1088/0264-9381/14/8/028 | null | gr-qc | null | The asymptotic behaviour of vacuum Bianchi models of class A near the initial
singularity is studied, in an effort to confirm the standard picture arising
from heuristic and numerical approaches by mathematical proofs. It is shown
that for solutions of types other than VIII and IX the singularity is velocity
dominate... | [
{
"created": "Fri, 14 Mar 1997 12:30:08 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Rendall",
"Alan D.",
""
]
] | The asymptotic behaviour of vacuum Bianchi models of class A near the initial singularity is studied, in an effort to confirm the standard picture arising from heuristic and numerical approaches by mathematical proofs. It is shown that for solutions of types other than VIII and IX the singularity is velocity dominated ... |
gr-qc/0302077 | Stoytcho Yazadjiev | Stoytcho S. Yazadjiev (Sofia University) | Self-similar collapse of a scalar field in dilaton gravity and critical
behaviour | 9 pages, LaTex; v2 references and a comment added | Int.J.Mod.Phys. A19 (2004) 2495-2504 | 10.1142/S0217751X04017793 | null | gr-qc | null | We present new analytical self-similar solutions describing a collapse of a
massless scalar field in scalar-tensor theories. The solutions exhibit a type
of critical behavior. The black hole mass for the near critical evolution is
analytically obtained for several scalar-tensor theories and the critical
exponent is c... | [
{
"created": "Wed, 19 Feb 2003 10:04:48 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Feb 2003 09:51:40 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Yazadjiev",
"Stoytcho S.",
"",
"Sofia University"
]
] | We present new analytical self-similar solutions describing a collapse of a massless scalar field in scalar-tensor theories. The solutions exhibit a type of critical behavior. The black hole mass for the near critical evolution is analytically obtained for several scalar-tensor theories and the critical exponent is cal... |
2201.00444 | Wei Fang | Qile Zhang, Wei Fang, Chenggang Shu | Dynamical Stability of the Power Law K-essence Dark Energy Model with a
New Interaction | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmological evolution of the power law K-essence dark
energy (DE) model $F(X)= -\sqrt{X} + X$ with a new interaction $Q = \alpha\rho
_m\rho _{\phi }H^{-1}$ in FRWL spacetime. The evolution behavior of dark energy
under this interaction is analyzed by using dynamical systems method, and ten
critica... | [
{
"created": "Mon, 3 Jan 2022 00:57:13 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2022 12:58:21 GMT",
"version": "v2"
}
] | 2022-01-21 | [
[
"Zhang",
"Qile",
""
],
[
"Fang",
"Wei",
""
],
[
"Shu",
"Chenggang",
""
]
] | We investigate the cosmological evolution of the power law K-essence dark energy (DE) model $F(X)= -\sqrt{X} + X$ with a new interaction $Q = \alpha\rho _m\rho _{\phi }H^{-1}$ in FRWL spacetime. The evolution behavior of dark energy under this interaction is analyzed by using dynamical systems method, and ten critical ... |
gr-qc/0403006 | Luis Herrera | L.Herrera, A. Di Prisco, J. Martin, J. Ospino, N.O.Santos, O.Troconis | Spherically symmetric dissipative anisotropic fluids: A general study | 28 pages Latex. To appear in Phys.Rev.D | Phys.Rev.D69:084026,2004 | 10.1103/PhysRevD.69.084026 | null | gr-qc astro-ph | null | The full set of equations governing the evolution of self--gravitating
spherically symmetric dissipative fluids with anisotropic stresses is deployed
and used to carry out a general study on the behaviour of such systems, in the
context of general relativity. Emphasis is given to the link between the Weyl
tensor, the... | [
{
"created": "Sun, 29 Feb 2004 21:11:22 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Martin",
"J.",
""
],
[
"Ospino",
"J.",
""
],
[
"Santos",
"N. O.",
""
],
[
"Troconis",
"O.",
""
]
] | The full set of equations governing the evolution of self--gravitating spherically symmetric dissipative fluids with anisotropic stresses is deployed and used to carry out a general study on the behaviour of such systems, in the context of general relativity. Emphasis is given to the link between the Weyl tensor, the s... |
gr-qc/9812083 | null | Reginald T. Cahill, Christopher M. Klinger (Department of Physics,
Flinders University) | Self-Referential Noise and the Synthesis of Three-Dimensional Space | Figure labels corrected | Gen. Rel.Grav. 32:529,2000 | 10.1023/A:1001984518976 | null | gr-qc adap-org nlin.AO | null | Generalising results from Godel and Chaitin in mathematics suggests that
self-referential systems contain intrinsic randomness. We argue that this is
relevant to modelling the universe and show how three-dimensional space may
arise from a non-geometric order-disorder model driven by self-referential
noise.
| [
{
"created": "Thu, 24 Dec 1998 01:20:09 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Dec 1998 06:40:30 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Cahill",
"Reginald T.",
"",
"Department of Physics,\n Flinders University"
],
[
"Klinger",
"Christopher M.",
"",
"Department of Physics,\n Flinders University"
]
] | Generalising results from Godel and Chaitin in mathematics suggests that self-referential systems contain intrinsic randomness. We argue that this is relevant to modelling the universe and show how three-dimensional space may arise from a non-geometric order-disorder model driven by self-referential noise. |
gr-qc/0203031 | J. E. Horvath | P.S. Custodio and J.E. Horvath (IAG/USP, Sao Paulo) | The evolution of primordial black hole masses in the radiation-
dominated era | 9 pages, 1 .eps figure. submitted to GRG | Gen.Rel.Grav. 34 (2002) 1895-1907 | null | IAG/USP 02-24 | gr-qc | null | We revisit the problem of PBH mass evolution in the radiation-dominated era.
We solve the complete differential equation in the semiclassical regime with
absorption and evaporation terms and show that PBHs can gain very little mass,
if at all, in this era. Relativistic proper motion of PBHs respect to the CMBR,
as a ... | [
{
"created": "Sun, 10 Mar 2002 02:37:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Custodio",
"P. S.",
"",
"IAG/USP, Sao Paulo"
],
[
"Horvath",
"J. E.",
"",
"IAG/USP, Sao Paulo"
]
] | We revisit the problem of PBH mass evolution in the radiation-dominated era. We solve the complete differential equation in the semiclassical regime with absorption and evaporation terms and show that PBHs can gain very little mass, if at all, in this era. Relativistic proper motion of PBHs respect to the CMBR, as a po... |
1711.10483 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo, Jutta Kunz, Francisco Navarro-L\'erida,
Eugen Radu | Squashed, magnetized black holes in $D=5$ minimal gauged supergravity | 45 pages, 15 figures, corrected typos, matches version published in
JHEP | JHEP 1802 (2018) 061 | 10.1007/JHEP02(2018)061 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a new class of black hole solutions in five-dimensional
Einstein-Maxwell-Chern-Simons theory with a negative cosmological constant.
These configurations are cohomogeneity-1, with two equal-magnitude angular
momenta. In the generic case, they possess a non-vanishing magnetic potential
at infinity with a b... | [
{
"created": "Tue, 28 Nov 2017 17:11:49 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2017 17:46:34 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Mar 2018 16:44:55 GMT",
"version": "v3"
}
] | 2018-03-05 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Navarro-Lérida",
"Francisco",
""
],
[
"Radu",
"Eugen",
""
]
] | We construct a new class of black hole solutions in five-dimensional Einstein-Maxwell-Chern-Simons theory with a negative cosmological constant. These configurations are cohomogeneity-1, with two equal-magnitude angular momenta. In the generic case, they possess a non-vanishing magnetic potential at infinity with a bou... |
gr-qc/0111113 | Jozef Sima | Jozef Sima and Miroslav Sukenik | Formation of Complex Matter Structures and Mutual Relations Between the
Mass of Elementary Particles | 6 pages, LaTeX | null | null | SS-01-10 | gr-qc | null | The model of Expansive Nondecelerative Universe leads to a conclusion stating
that at the end of radiation era the Jeans mass was equal to the upper mass
limit of a black hole and, at the same time, the effective gravitational range
of nucleons was identical to their Compton wavelength. At that time nucleons
started ... | [
{
"created": "Fri, 30 Nov 2001 11:06:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sima",
"Jozef",
""
],
[
"Sukenik",
"Miroslav",
""
]
] | The model of Expansive Nondecelerative Universe leads to a conclusion stating that at the end of radiation era the Jeans mass was equal to the upper mass limit of a black hole and, at the same time, the effective gravitational range of nucleons was identical to their Compton wavelength. At that time nucleons started to... |
2402.05485 | Wei-Liang Qian | Wei-Liang Qian, Qiyuan Pan, Bean Wang, Rui-Hong Yue | Late-time tail and echoes of Damour-Solodukhin wormholes | 20 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Damour-Solodukhin wormholes are intriguing theoretical constructs, closely
mimicking many properties of black holes. This study delves into two distinct
characteristics of the waveforms emitted from such wormholes, namely, the
late-time tails and echoes, which can substantially be used to distinguish its
identity. No... | [
{
"created": "Thu, 8 Feb 2024 08:27:43 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jun 2024 13:02:47 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Aug 2024 12:52:50 GMT",
"version": "v3"
}
] | 2024-08-02 | [
[
"Qian",
"Wei-Liang",
""
],
[
"Pan",
"Qiyuan",
""
],
[
"Wang",
"Bean",
""
],
[
"Yue",
"Rui-Hong",
""
]
] | Damour-Solodukhin wormholes are intriguing theoretical constructs, closely mimicking many properties of black holes. This study delves into two distinct characteristics of the waveforms emitted from such wormholes, namely, the late-time tails and echoes, which can substantially be used to distinguish its identity. Nota... |
2208.01771 | Chen-Kai Qiao | Chen-Kai Qiao | Curvatures, Photon Spheres and Black Hole Shadows | 14 pages, 3 figures, 3 tables (text overlap with arXiv:2204.07297).
V2: Minor Revision, Accepted by Physical Review D | Physical Review D 106, 084060 (2022) | 10.1103/PhysRevD.106.084060 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In a recent work PRD 106, L021501 (2022), a new geometric approach is
proposed to obtain the photon sphere (circular photon orbit) and the black hole
shadow radius. In this approach, photon spheres and the black hole shadow
radius are determined using geodesic curvature and Gaussian curvature in the
optical geometry ... | [
{
"created": "Tue, 2 Aug 2022 22:08:26 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2022 12:12:00 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Nov 2022 16:50:37 GMT",
"version": "v3"
}
] | 2022-11-11 | [
[
"Qiao",
"Chen-Kai",
""
]
] | In a recent work PRD 106, L021501 (2022), a new geometric approach is proposed to obtain the photon sphere (circular photon orbit) and the black hole shadow radius. In this approach, photon spheres and the black hole shadow radius are determined using geodesic curvature and Gaussian curvature in the optical geometry of... |
gr-qc/9312033 | Eli John Hawkins | Eli Hawkins | Quantum Gravitational Collapse of a Charged Dust Shell | 12 pages, UMDGR--94--76 | Phys.Rev.D49:6556,1994; Erratum-ibid.D50:7744,1994;
Phys.Rev.D50:7744,1994 | 10.1103/PhysRevD.49.6556 10.1103/PhysRevD.50.7744 | null | gr-qc | null | A simple self gravitating system --- a thin spherical shell of charged
pressureless matter --- is naively quantized as a test case of quantum
gravitational collapse. The model is interpreted in terms of an inner product
on the positive energy states. An S-matrix is constructed describing scattering
between negatively... | [
{
"created": "Tue, 21 Dec 1993 22:03:37 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 1993 20:15:07 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Hawkins",
"Eli",
""
]
] | A simple self gravitating system --- a thin spherical shell of charged pressureless matter --- is naively quantized as a test case of quantum gravitational collapse. The model is interpreted in terms of an inner product on the positive energy states. An S-matrix is constructed describing scattering between negatively a... |
0712.3246 | Remo Garattini | Remo Garattini | Extracting the Cosmological Constant from the Wheeler DeWitt Equation in
a Modified Gravity Theory | Talk given at QFEXT 07, Workshop on Quantum Field Theory Under the
Influence of External Conditions, Leipzig, 17-21 Sep 2007 and talk given at
9th International Conference on Path Integrals - New Trends and Perspectives,
Dresden, 23-28 September 2007. 8 pages, accepted for publication in Journal
of Physics A | J.Phys.A41:164057,2008 | 10.1088/1751-8113/41/16/164057 | null | gr-qc hep-th | null | We discuss how to extract information about the cosmological constant from
the Wheeler-DeWitt equation, considered as an eigenvalue of a Sturm-Liouville
problem. A generalization to a f(R)theory is taken under examination. The
equation is approximated to one loop with the help of a variational approach
with Gaussian ... | [
{
"created": "Wed, 19 Dec 2007 18:03:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Garattini",
"Remo",
""
]
] | We discuss how to extract information about the cosmological constant from the Wheeler-DeWitt equation, considered as an eigenvalue of a Sturm-Liouville problem. A generalization to a f(R)theory is taken under examination. The equation is approximated to one loop with the help of a variational approach with Gaussian tr... |
0903.3684 | Peter Komorowski | P. G. Komorowski, S. R. Valluri, M. Houde | A Study of Elliptical Last Stable Orbits About a Massive Kerr Black Hole | 42 pages, 9 figures, accepted for publication in Classical and
Quantum Gravity | Class.Quant.Grav.26:085001,2009 | 10.1088/0264-9381/26/8/085001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The last stable orbit (LSO) of a compact object (CO) is an important boundary
condition when performing numerical analysis of orbit evolution. Although the
LSO is already well understood for the case where a test-particle is in an
elliptical orbit around a Schwarzschild black hole (SBH) and for the case of a
circular... | [
{
"created": "Sat, 21 Mar 2009 19:51:34 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Komorowski",
"P. G.",
""
],
[
"Valluri",
"S. R.",
""
],
[
"Houde",
"M.",
""
]
] | The last stable orbit (LSO) of a compact object (CO) is an important boundary condition when performing numerical analysis of orbit evolution. Although the LSO is already well understood for the case where a test-particle is in an elliptical orbit around a Schwarzschild black hole (SBH) and for the case of a circular o... |
1803.02429 | Huan Yang | Huan Yang, Denis Martynov | Testing Gravitational Memory Generation with Compact Binary Mergers | 9 pages, 5 figures | Phys. Rev. Lett. 121, 071102 (2018) | 10.1103/PhysRevLett.121.071102 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational memory is an important prediction of classical General
Relativity, which is intimately related to asymptotic symmetries at null
infinity and the so-called soft graviton theorem first shown by Weinberg. For a
given transient astronomical event, the angular distributions of energy and
angular momentum flu... | [
{
"created": "Tue, 6 Mar 2018 21:19:34 GMT",
"version": "v1"
}
] | 2018-08-22 | [
[
"Yang",
"Huan",
""
],
[
"Martynov",
"Denis",
""
]
] | Gravitational memory is an important prediction of classical General Relativity, which is intimately related to asymptotic symmetries at null infinity and the so-called soft graviton theorem first shown by Weinberg. For a given transient astronomical event, the angular distributions of energy and angular momentum flux ... |
2101.05318 | Ratbay Myrzakulov | T. Myrzakul, K. Yesmakhanova, N. Myrzakulov, S. Myrzakul, K.
Myrzakulov, K. Yerzhanov, R. Myrzakulov, G. Nugmanova | Metric-affine Myrzakulov gravity theories with Gauss-Bonnet and boundary
term scalars | 41 pages. arXiv admin note: substantial text overlap with
arXiv:1205.5266 | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In this paper, we consider some metric-affine Myrzakulov gravity (MG)
theories with Gauss-Bonnet scalars. Also we consider the MG theories with the
boundary term scalars. Note that these MG theories with the Gauss-Bonnet and
boundary term scalars were proposed in [arXiv:1205.5266]. Some examples of
Metric-Affine Grav... | [
{
"created": "Wed, 13 Jan 2021 19:46:14 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2021 15:41:23 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Apr 2024 13:50:24 GMT",
"version": "v3"
}
] | 2024-04-30 | [
[
"Myrzakul",
"T.",
""
],
[
"Yesmakhanova",
"K.",
""
],
[
"Myrzakulov",
"N.",
""
],
[
"Myrzakul",
"S.",
""
],
[
"Myrzakulov",
"K.",
""
],
[
"Yerzhanov",
"K.",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Nugm... | In this paper, we consider some metric-affine Myrzakulov gravity (MG) theories with Gauss-Bonnet scalars. Also we consider the MG theories with the boundary term scalars. Note that these MG theories with the Gauss-Bonnet and boundary term scalars were proposed in [arXiv:1205.5266]. Some examples of Metric-Affine Gravit... |
gr-qc/9803047 | Andrew Chamblin | Raphael Bousso (Stanford) and Andrew Chamblin (Cambridge) | Patching up the No-Boundary Proposal with virtual Euclidean wormholes | 23 pages REVTeX plus 7 figures | Phys.Rev. D59 (1999) 084004 | 10.1103/PhysRevD.59.084004 | DAMTP-R-97/37, SU-ITP-98/11 | gr-qc hep-th | null | In quantum cosmology, one often considers tunneling phenomena which may have
occurred in the early universe. Processes requiring quantum penetration of a
potential barrier include black hole pair creation and the decay of vacuum
domain walls. Ideally, one calculates the rates for such processes by finding
an instanto... | [
{
"created": "Fri, 13 Mar 1998 02:31:20 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bousso",
"Raphael",
"",
"Stanford"
],
[
"Chamblin",
"Andrew",
"",
"Cambridge"
]
] | In quantum cosmology, one often considers tunneling phenomena which may have occurred in the early universe. Processes requiring quantum penetration of a potential barrier include black hole pair creation and the decay of vacuum domain walls. Ideally, one calculates the rates for such processes by finding an instanton,... |
gr-qc/0610044 | Iver Brevik | Iver Brevik and John Quiroga Hurtado | Vanishing Cosmological Constant in Modified Gauss-Bonnet Gravity with
Conformal Anomaly | 8 pages latex, 1 figure. To appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys.D16:817-826,2007 | 10.1142/S0218271807010419 | null | gr-qc | null | We consider dark energy cosmology in a de Sitter universe filled with quantum
conformal matter. Our model represents a Gauss-Bonnet model of gravity with
contributions from quantum effects. To the General Relativity action an
arbitrary function of the GB invariant, f(G), is added, and taking into account
quantum effe... | [
{
"created": "Tue, 10 Oct 2006 11:46:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Brevik",
"Iver",
""
],
[
"Hurtado",
"John Quiroga",
""
]
] | We consider dark energy cosmology in a de Sitter universe filled with quantum conformal matter. Our model represents a Gauss-Bonnet model of gravity with contributions from quantum effects. To the General Relativity action an arbitrary function of the GB invariant, f(G), is added, and taking into account quantum effect... |
2206.10653 | Aaron Zimmerman | Asad Hussain and Aaron Zimmerman | An approach to computing spectral shifts for black holes beyond Kerr | 23 pages, 1 figure | null | 10.1103/PhysRevD.106.104018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent measurements of gravitational-wave ringdown following the merger of
binary black holes raise the prospect of precision black hole spectroscopy in
the near future. To perform the most sensitive tests of the nature of black
holes using ringdown measurements, it is critical to compute the deviations to
the spectr... | [
{
"created": "Tue, 21 Jun 2022 18:06:02 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Hussain",
"Asad",
""
],
[
"Zimmerman",
"Aaron",
""
]
] | Recent measurements of gravitational-wave ringdown following the merger of binary black holes raise the prospect of precision black hole spectroscopy in the near future. To perform the most sensitive tests of the nature of black holes using ringdown measurements, it is critical to compute the deviations to the spectrum... |
0805.2106 | Roberto Chan | C. F. C. Brandt, R. Chan, M. F. A. da Silva, J. F. Villas da Rocha | Dressing a Naked Singularity: an Example | 14 pages, 1 figure. This version corrects an error in the calculus of
the pressure and in the conclusions | Int.J.Mod.Phys.D19:317,2010 | 10.1142/S0218271810016439 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the evolution of a perfect fluid with self-similarity of the
second kind, we have found that an initial naked singularity can be trapped by
an event horizon due to collapsing matter. The fluid moves along time-like
geodesics with a self-similar parameter $\alpha = -3$. Since the metric
obtained is not asy... | [
{
"created": "Wed, 14 May 2008 16:27:10 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2009 16:06:09 GMT",
"version": "v2"
}
] | 2012-10-25 | [
[
"Brandt",
"C. F. C.",
""
],
[
"Chan",
"R.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"da Rocha",
"J. F. Villas",
""
]
] | Considering the evolution of a perfect fluid with self-similarity of the second kind, we have found that an initial naked singularity can be trapped by an event horizon due to collapsing matter. The fluid moves along time-like geodesics with a self-similar parameter $\alpha = -3$. Since the metric obtained is not asymp... |
1205.3097 | Markus B. Fr\"ob | Markus B. Fr\"ob, Albert Roura, Enric Verdaguer | One-loop gravitational wave spectrum in de Sitter spacetime | 42 pages, 2 figures, includes three new paragraphs in response to
referee's comments | JCAP08(2012)009 | 10.1088/1475-7516/2012/08/009 | AEI-2011-066 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-point function for tensor metric perturbations around de Sitter
spacetime including one-loop corrections from massless conformally coupled
scalar fields is calculated exactly. We work in the Poincar\'e patch (with
spatially flat sections) and employ dimensional regularization for the
renormalization process. ... | [
{
"created": "Mon, 14 May 2012 16:57:53 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2012 12:33:51 GMT",
"version": "v2"
}
] | 2012-09-06 | [
[
"Fröb",
"Markus B.",
""
],
[
"Roura",
"Albert",
""
],
[
"Verdaguer",
"Enric",
""
]
] | The two-point function for tensor metric perturbations around de Sitter spacetime including one-loop corrections from massless conformally coupled scalar fields is calculated exactly. We work in the Poincar\'e patch (with spatially flat sections) and employ dimensional regularization for the renormalization process. Un... |
2002.12095 | Takahiro Yamamoto S. | Takahiro S. Yamamoto and Takahiro Tanaka | Use of conditional variational auto encoder to analyze ringdown
gravitational waves | 9 pages, 5 figures | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, several deep learning methods are proposed for the gravitational
wave data analysis. One is conditional variational auto encoder (CVAE),
proposed by Gabbard et al. [1]. We study the accuracy of a CVAE in the context
of the estimation of the QNM frequency of the ringdown. We show that the
accuracy of the est... | [
{
"created": "Thu, 27 Feb 2020 13:59:55 GMT",
"version": "v1"
}
] | 2020-02-28 | [
[
"Yamamoto",
"Takahiro S.",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | Recently, several deep learning methods are proposed for the gravitational wave data analysis. One is conditional variational auto encoder (CVAE), proposed by Gabbard et al. [1]. We study the accuracy of a CVAE in the context of the estimation of the QNM frequency of the ringdown. We show that the accuracy of the estim... |
1305.6645 | Sergio Dain | Sergio Dain | Inequality between size and angular momentum for bodies | Improvements in the heuristic arguments. 5 pages | Phys. Rev. Lett. 112, 041101 (2014) | 10.1103/PhysRevLett.112.041101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A universal inequality that bounds the angular momentum of a body by the
square of its size is presented and heuristic physical arguments are given to
support it. We prove a version of this inequality, as consequence of Einstein
equations, for the case of rotating axially symmetric, constant density,
bodies. Finally,... | [
{
"created": "Tue, 28 May 2013 22:12:18 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 2014 12:06:56 GMT",
"version": "v2"
}
] | 2014-02-05 | [
[
"Dain",
"Sergio",
""
]
] | A universal inequality that bounds the angular momentum of a body by the square of its size is presented and heuristic physical arguments are given to support it. We prove a version of this inequality, as consequence of Einstein equations, for the case of rotating axially symmetric, constant density, bodies. Finally, t... |
gr-qc/9411073 | James Anglin | J.R. Anglin, R. Laflamme, W.H. Zurek, and J.P. Paz | Decoherence, Re-coherence, and the Black Hole Information Paradox | 23 pages, 2 figures included, figures 3.1 - 3.3 available at
http://qso.lanl.gov/papers/Papers.html | Phys.Rev.D52:2221-2231,1995 | 10.1103/PhysRevD.52.2221 | LA-UR-94-3817 | gr-qc hep-th quant-ph | null | We analyze a system consisting of an oscillator coupled to a field. With the
field traced out as an environment, the oscillator loses coherence on a very
short {\it decoherence timescale}; but, on a much longer {\it relaxation
timescale}, predictably evolves into a unique, pure (ground) state. This
example of {\it re... | [
{
"created": "Wed, 30 Nov 1994 00:36:36 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Anglin",
"J. R.",
""
],
[
"Laflamme",
"R.",
""
],
[
"Zurek",
"W. H.",
""
],
[
"Paz",
"J. P.",
""
]
] | We analyze a system consisting of an oscillator coupled to a field. With the field traced out as an environment, the oscillator loses coherence on a very short {\it decoherence timescale}; but, on a much longer {\it relaxation timescale}, predictably evolves into a unique, pure (ground) state. This example of {\it re-c... |
gr-qc/0006109 | J. Alberto Lobo | J. Alberto Lobo | The mathematical theory of resonant transducers in a spherical gravity
wave antenna | 31 pages, 7 figures, LaTeX2e, \usepackage{graphicx,deleq} | Mon.Not.Roy.Astron.Soc. 316 (2000) 173-194 | 10.1046/j.1365-8711.2000.03492.x | null | gr-qc | null | The rigoruos mathematical theory of the coupling and response of a spherical
gravitational wave detector endowed with a set of resonant transducers is
presented and developed. A perturbative series in ascending powers of the
square root of the ratio of the resonator to the sphere mass is seen to be the
key to the sol... | [
{
"created": "Fri, 30 Jun 2000 14:50:11 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lobo",
"J. Alberto",
""
]
] | The rigoruos mathematical theory of the coupling and response of a spherical gravitational wave detector endowed with a set of resonant transducers is presented and developed. A perturbative series in ascending powers of the square root of the ratio of the resonator to the sphere mass is seen to be the key to the solut... |
1911.09083 | Gabriele Vajente | Gabriele Vajente, Yiwen Huang, Maximiliano Isi, Jenne C. Driggers,
Jeffrey S. Kissel, Marek J. Szczepanczyk, Salvatore Vitale | Machine-learning non-stationary noise out of gravitational wave
detectors | null | Phys. Rev. D 101, 042003 (2020) | 10.1103/PhysRevD.101.042003 | null | gr-qc astro-ph.IM cs.LG physics.data-an physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Signal extraction out of background noise is a common challenge in high
precision physics experiments, where the measurement output is often a
continuous data stream. To improve the signal to noise ratio of the detection,
witness sensors are often used to independently measure background noises and
subtract them from... | [
{
"created": "Wed, 20 Nov 2019 18:41:24 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jan 2020 21:45:19 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jan 2020 23:57:39 GMT",
"version": "v3"
}
] | 2020-02-26 | [
[
"Vajente",
"Gabriele",
""
],
[
"Huang",
"Yiwen",
""
],
[
"Isi",
"Maximiliano",
""
],
[
"Driggers",
"Jenne C.",
""
],
[
"Kissel",
"Jeffrey S.",
""
],
[
"Szczepanczyk",
"Marek J.",
""
],
[
"Vitale",
"Salvatore",
... | Signal extraction out of background noise is a common challenge in high precision physics experiments, where the measurement output is often a continuous data stream. To improve the signal to noise ratio of the detection, witness sensors are often used to independently measure background noises and subtract them from t... |
1305.6770 | Tiberiu Harko | Tiberiu Harko, Francisco S. N. Lobo, M. K. Mak, Sergey V. Sushkov | Structure of neutron, quark and exotic stars in Eddington-inspired
Born-Infeld gravity | 12 pages, 8 figures | Phys.Rev.D88:044032,2013 | 10.1103/PhysRevD.88.044032 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the structure and physical properties of specific classes of
neutron, quark and "exoti"' stars in Eddington-inspired Born-Infeld (EiBI)
gravity. The latter reduces to standard general relativity in vacuum, but
presents a different behavior of the gravitational field in the presence of
matter. The equilibr... | [
{
"created": "Tue, 28 May 2013 06:16:36 GMT",
"version": "v1"
}
] | 2013-08-21 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mak",
"M. K.",
""
],
[
"Sushkov",
"Sergey V.",
""
]
] | We consider the structure and physical properties of specific classes of neutron, quark and "exoti"' stars in Eddington-inspired Born-Infeld (EiBI) gravity. The latter reduces to standard general relativity in vacuum, but presents a different behavior of the gravitational field in the presence of matter. The equilibriu... |
1702.02209 | Roberto Ivan Cabrera Munguia Dr. | I. Cabrera-Munguia, V. E. Ceron, L. A. L\'opez, and Omar Pedraza | Corotating two-body system of identical Kerr sources | 7 pages, 7 figures, improved figures, typos corrected | Phys. Lett. B 772: 10-15 (2017) | 10.1016/j.physletb.2017.06.021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A binary system of identical corotating Kerr sources is studied after
deriving the corresponding 3-parametric asymptotically flat exact solution.
Both sources are apart from each other by means of a massless strut (conical
singularity). In the context of black holes, the analytical functional form of
each horizon {\s... | [
{
"created": "Tue, 7 Feb 2017 21:39:35 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2017 09:05:27 GMT",
"version": "v2"
}
] | 2018-11-02 | [
[
"Cabrera-Munguia",
"I.",
""
],
[
"Ceron",
"V. E.",
""
],
[
"López",
"L. A.",
""
],
[
"Pedraza",
"Omar",
""
]
] | A binary system of identical corotating Kerr sources is studied after deriving the corresponding 3-parametric asymptotically flat exact solution. Both sources are apart from each other by means of a massless strut (conical singularity). In the context of black holes, the analytical functional form of each horizon {\sig... |
1903.03343 | Subhra Bhattacharya | Shibaji Halder, Subhra Bhattacharya, Subenoy Chakraborty | Spherically symmetric wormhole solutions in a general anisotropic matter
field | Accepted in Phys. Lett. B | null | 10.1016/j.physletb.2019.02.041 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work is an attempt to find possible traversable wormhole
solutions in static spherically symmetric space-time supported by anisotropic
matter field. Part of the work could be considered as a generalization of the
work in Phys. Lett. B 757 (2016), 130 in the sense that it extends the work
done therein. The... | [
{
"created": "Fri, 8 Mar 2019 09:55:52 GMT",
"version": "v1"
}
] | 2019-03-11 | [
[
"Halder",
"Shibaji",
""
],
[
"Bhattacharya",
"Subhra",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work is an attempt to find possible traversable wormhole solutions in static spherically symmetric space-time supported by anisotropic matter field. Part of the work could be considered as a generalization of the work in Phys. Lett. B 757 (2016), 130 in the sense that it extends the work done therein. The p... |
2301.05915 | Chao Zhang | Chao Zhang, Hong Guo, Yungui Gong and Bin Wang | Detecting vector charge with extreme mass ratio inspirals onto Kerr
black holes | 35 pages, 12 figures; accepted for publication by JCAP | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extreme mass ratio inspirals (EMRIs) are excellent sources for space-based
observatories to explore the properties of black holes and test no-hair
theorems. We consider EMRIs with a charged compact object inspiralling onto a
Kerr black hole in quasi-circular orbits. Using the Teukolsky and generalized
Sasaki-Nakamura... | [
{
"created": "Sat, 14 Jan 2023 13:23:54 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2023 02:28:40 GMT",
"version": "v2"
}
] | 2023-06-29 | [
[
"Zhang",
"Chao",
""
],
[
"Guo",
"Hong",
""
],
[
"Gong",
"Yungui",
""
],
[
"Wang",
"Bin",
""
]
] | Extreme mass ratio inspirals (EMRIs) are excellent sources for space-based observatories to explore the properties of black holes and test no-hair theorems. We consider EMRIs with a charged compact object inspiralling onto a Kerr black hole in quasi-circular orbits. Using the Teukolsky and generalized Sasaki-Nakamura f... |
1107.2732 | De-Cheng Zou | Kang Zhou, Zhan-Ying Yang, De-Cheng Zou and Rui-Hong Yue | Static spherically symmetric star in Gauss-Bonnet gravity | 11 pages, 2 figures and some new references added | null | 10.1088/1674-1056/21/2/020401 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore static spherically symmetric stars in the Gauss-Bonnet gravity
without cosmological constant, and present an exact internal solution which
attaches to the exterior vacuum solution outside stars. It turns out that the
presence of the Gauss-Bonnet term with a positive coupling constant completely
changes the... | [
{
"created": "Thu, 14 Jul 2011 05:50:21 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Oct 2011 07:28:23 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Nov 2011 11:28:23 GMT",
"version": "v3"
}
] | 2015-05-28 | [
[
"Zhou",
"Kang",
""
],
[
"Yang",
"Zhan-Ying",
""
],
[
"Zou",
"De-Cheng",
""
],
[
"Yue",
"Rui-Hong",
""
]
] | We explore static spherically symmetric stars in the Gauss-Bonnet gravity without cosmological constant, and present an exact internal solution which attaches to the exterior vacuum solution outside stars. It turns out that the presence of the Gauss-Bonnet term with a positive coupling constant completely changes therm... |
1703.06434 | Rafael A. Porto | Rafael A. Porto | The Lamb shift and the gravitational binding energy for binary black
holes | 18 pages. 6 figures. To appear in Phys. Rev. D | Phys. Rev. D 96, 024063 (2017) | 10.1103/PhysRevD.96.024063 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the correction to the gravitational binding energy for binary
black holes due to the tail effect resembles the Lamb shift in the Hydrogen
atom. In both cases a 'conservative' effect arises from interactions with
'radiation' modes, and moreover an explicit cancelation between near and far
zone divergences... | [
{
"created": "Sun, 19 Mar 2017 13:31:29 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jul 2017 14:58:36 GMT",
"version": "v2"
}
] | 2017-08-09 | [
[
"Porto",
"Rafael A.",
""
]
] | We show that the correction to the gravitational binding energy for binary black holes due to the tail effect resembles the Lamb shift in the Hydrogen atom. In both cases a 'conservative' effect arises from interactions with 'radiation' modes, and moreover an explicit cancelation between near and far zone divergences i... |
2312.05857 | Cosimo Bambi | Cosimo Bambi | Testing General Relativity with black hole X-ray data | 10 pages, 2 figures. Talk given at the "XXXV International Workshop
on High Energy Physics - From Quarks to Galaxies: Elucidating Dark Sides"
(Protvino, Russia, 28 November - 1 December 2023) | Physics of Particles and Nuclei 55, 1418-1423 (2024) | 10.1134/S106377962470103X | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theory of General Relativity has successfully passed a large number of
observational tests without requiring any adjustment from its original version
proposed by Einstein in 1915. The past 8 years have seen significant
advancements in the study of the strong-field regime, which can now be tested
with gravitationa... | [
{
"created": "Sun, 10 Dec 2023 11:44:18 GMT",
"version": "v1"
}
] | 2024-08-15 | [
[
"Bambi",
"Cosimo",
""
]
] | The theory of General Relativity has successfully passed a large number of observational tests without requiring any adjustment from its original version proposed by Einstein in 1915. The past 8 years have seen significant advancements in the study of the strong-field regime, which can now be tested with gravitational ... |
1711.08234 | Gopal Sardar | Nirmalya Kajuri and Gopal Sardar | Low Energy Lorentz Violation in Polymer Quantization Revisited | Acknowledgements updated | null | 10.1016/j.physletb.2017.11.071 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous work, it had been shown that polymer quantized scalar field
theory predicts that even an inertial observer can experience spontaneous
excitations. This prediction was shown to hold at low energies. However, in
these papers it was assumed that the polymer scale is constant. But it is
possible to relax this... | [
{
"created": "Wed, 22 Nov 2017 11:30:40 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2017 12:42:51 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Kajuri",
"Nirmalya",
""
],
[
"Sardar",
"Gopal",
""
]
] | In previous work, it had been shown that polymer quantized scalar field theory predicts that even an inertial observer can experience spontaneous excitations. This prediction was shown to hold at low energies. However, in these papers it was assumed that the polymer scale is constant. But it is possible to relax this c... |
1605.04629 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu | Implementing black hole as efficient power plant | 17 pages, 6 figures, and 2 tables | Commun. Theor. Phys. 71, 711 (2019) | 10.1088/0253-6102/71/6/711 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Treating the black hole molecules as working substance and considering its
phase structure, we study the black hole heat engine by a charged anti-de
Sitter black hole. In the reduced temperature-entropy chart, it is found that
the work, heat, and efficiency of the engine are free of the black hole charge.
Applying th... | [
{
"created": "Mon, 16 May 2016 02:03:46 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2019 21:42:23 GMT",
"version": "v2"
}
] | 2019-06-11 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Treating the black hole molecules as working substance and considering its phase structure, we study the black hole heat engine by a charged anti-de Sitter black hole. In the reduced temperature-entropy chart, it is found that the work, heat, and efficiency of the engine are free of the black hole charge. Applying the ... |
gr-qc/9406043 | null | M.Carfora, G.F.R.Ellis | The Geometry of classical change of signature | 20pages | Int.J.Mod.Phys.D4:175-188,1995 | 10.1142/S0218271895000120 | null | gr-qc | null | The proposal of the possibility of change of signature in quantum cosmology
has led to the study of this phenomenon in classical general relativity theory,
where there has been some controversy about what is and is not possible. We
here present a new analysis of such a change of signature, based on previous
studies o... | [
{
"created": "Thu, 23 Jun 1994 14:29:28 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Carfora",
"M.",
""
],
[
"Ellis",
"G. F. R.",
""
]
] | The proposal of the possibility of change of signature in quantum cosmology has led to the study of this phenomenon in classical general relativity theory, where there has been some controversy about what is and is not possible. We here present a new analysis of such a change of signature, based on previous studies of ... |
1109.6627 | Muhammad Sharif | M. Sharif and Wajiha Javed | Thermodynamics of a Bardeen black hole in noncommutative space | 17 pages, 9 figures, accepted for publication in Canadian J. Physics | Can. J. Phys. 89(2011)1027-1033 | 10.1139/p11-089 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine the effects of space noncommutativity on the
thermodynamics of a Bardeen charged regular black hole. For a suitable choice
of sets of parameters, the behavior of the singularity, horizon, mass function,
black hole mass, temperature, entropy and its differential, area and energy
distribution ... | [
{
"created": "Wed, 28 Sep 2011 07:20:18 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Sharif",
"M.",
""
],
[
"Javed",
"Wajiha",
""
]
] | In this paper, we examine the effects of space noncommutativity on the thermodynamics of a Bardeen charged regular black hole. For a suitable choice of sets of parameters, the behavior of the singularity, horizon, mass function, black hole mass, temperature, entropy and its differential, area and energy distribution of... |
gr-qc/0311045 | Bijan Saha | Bijan Saha and Todor Boyadjiev | Bianchi type I cosmology with scalar and spinor fields | 22 pages, 11 figures | Phys.Rev. D69 (2004) 124010 | 10.1103/PhysRevD.69.124010 | null | gr-qc | null | We consider a system of interacting spinor and scalar fields in a
gravitational field given by a Bianchi type-I cosmological model filled with
perfect fluid. The interacting term in the Lagrangian is chosen in the form of
derivative coupling, i.e., ${\cal L}_{\rm int} = \frac{\lambda}{2}
\vf_{,\alpha}\vf^{,\alpha} F$... | [
{
"created": "Fri, 14 Nov 2003 09:52:21 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
""
],
[
"Boyadjiev",
"Todor",
""
]
] | We consider a system of interacting spinor and scalar fields in a gravitational field given by a Bianchi type-I cosmological model filled with perfect fluid. The interacting term in the Lagrangian is chosen in the form of derivative coupling, i.e., ${\cal L}_{\rm int} = \frac{\lambda}{2} \vf_{,\alpha}\vf^{,\alpha} F$, ... |
1901.01902 | David Garfinkle | David Garfinkle | Black hole entropy as a consequence of excision | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole entropy is shown to be a consequence of restricting our
description of physics to the exterior of black holes. This precludes the need
for a statistical mechanical description of this entropy in terms of
microstates.
| [
{
"created": "Mon, 7 Jan 2019 16:23:55 GMT",
"version": "v1"
}
] | 2019-01-08 | [
[
"Garfinkle",
"David",
""
]
] | Black hole entropy is shown to be a consequence of restricting our description of physics to the exterior of black holes. This precludes the need for a statistical mechanical description of this entropy in terms of microstates. |
gr-qc/0205008 | Eric Gourgoulhon | Eric Gourgoulhon, Philippe Grandclement, Silvano Bonazzola | Last orbits of binary black holes | 4 pages, 2 figures, invited talk at Journees Relativistes 2001, to
appear in International Journal of Modern Physics A | Int.J.Mod.Phys. A17 (2002) 2689-2694 | 10.1142/S0217751X02011618 | null | gr-qc astro-ph | null | Binary black hole systems in the pre-coalescence stage are numerically
constructed by demanding that the associated spacetime admits a helical Killing
vector. Comparison with third order post-Newtonian calculations indicates a
rather good agreement until the innermost stable circular orbit.
| [
{
"created": "Thu, 2 May 2002 08:36:17 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gourgoulhon",
"Eric",
""
],
[
"Grandclement",
"Philippe",
""
],
[
"Bonazzola",
"Silvano",
""
]
] | Binary black hole systems in the pre-coalescence stage are numerically constructed by demanding that the associated spacetime admits a helical Killing vector. Comparison with third order post-Newtonian calculations indicates a rather good agreement until the innermost stable circular orbit. |
gr-qc/0510099 | Ragab Gad | A. H. Khater, D. K. Callebaut, S. F. Abdul-Aziz and T. N. Abdelhameed | Potential symmetry and invariant solutions of Fokker-Planck equation in
cylindrical coordinates related to magnetic field diffusion in
magnetohydrodynamics including the Hall current | 14 pages, 9 figures | null | 10.1140/epjb/e2006-00138-5 | null | gr-qc | null | Lie groups involving potential symmetries are applied in connection with the
system of magnetohydrodynamic equations for incompressible matter with Ohm's
law for finite resistivity and Hall current in cylindrical geometry. Some
simplifications allow to obtain a Fokker-Planck type equation. Invariant
solutions are obt... | [
{
"created": "Sun, 23 Oct 2005 09:45:18 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Khater",
"A. H.",
""
],
[
"Callebaut",
"D. K.",
""
],
[
"Abdul-Aziz",
"S. F.",
""
],
[
"Abdelhameed",
"T. N.",
""
]
] | Lie groups involving potential symmetries are applied in connection with the system of magnetohydrodynamic equations for incompressible matter with Ohm's law for finite resistivity and Hall current in cylindrical geometry. Some simplifications allow to obtain a Fokker-Planck type equation. Invariant solutions are obtai... |
1301.3098 | Kirill Bronnikov | K.A. Bronnikov, V.N. Melnikov, S.G. Rubin, I.V. Svadkovsky | Nonlinear multidimensional gravity and the Australian dipole | 15 pages, 1 figure. Comments and references added | null | 10.1007/s10714-013-1601-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existing observational data on possible variations of fundamental
physical constants (FPC) confirm more or less confidently only a variability of
the fine structure constant $\alpha$ in space and time. A model construction
method is described, where variations of $\alpha$ and other FPCs (including the
gravitation... | [
{
"created": "Mon, 14 Jan 2013 19:18:26 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2013 15:56:18 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Melnikov",
"V. N.",
""
],
[
"Rubin",
"S. G.",
""
],
[
"Svadkovsky",
"I. V.",
""
]
] | The existing observational data on possible variations of fundamental physical constants (FPC) confirm more or less confidently only a variability of the fine structure constant $\alpha$ in space and time. A model construction method is described, where variations of $\alpha$ and other FPCs (including the gravitational... |
1106.0925 | Richard Woodard | S. P. Miao, N. C. Tsamis and R. P. Woodard | The Graviton Propagator in de Donder Gauge on de Sitter Background | 39 pages, no figures, uses LaTeX2e | J.Math.Phys.52:122301,2011 | 10.1063/1.3664760 | UFIFT-QG-11-03 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the graviton propagator on de Sitter background in exact de
Donder gauge. We prove that it must break de Sitter invariance, just like the
propagator of the massless, minimally coupled scalar. Our explicit solutions
for its two scalar structure functions preserve spatial homogeneity and
isotropy so that t... | [
{
"created": "Sun, 5 Jun 2011 19:55:26 GMT",
"version": "v1"
}
] | 2011-12-30 | [
[
"Miao",
"S. P.",
""
],
[
"Tsamis",
"N. C.",
""
],
[
"Woodard",
"R. P.",
""
]
] | We construct the graviton propagator on de Sitter background in exact de Donder gauge. We prove that it must break de Sitter invariance, just like the propagator of the massless, minimally coupled scalar. Our explicit solutions for its two scalar structure functions preserve spatial homogeneity and isotropy so that the... |
1505.01030 | Hooman Moradpour Hooman | H. Ebadi, H. Moradpour | Thermodynamic of universe with a varying dark energy component | Accepted for Publishing in IJMPD | Vol. 24, No. 14 (2015) 1550098 | 10.1142/S0218271815500984 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a FRW universe filled by a dark energy candidate together with
other possible sources which may include the baryonic and non-baryonic matters.
Thereinafter, we consider a situation in which the cosmos sectors do not
interact with each other. By applying the unified first law of thermodynamics
on the appar... | [
{
"created": "Mon, 4 May 2015 14:37:53 GMT",
"version": "v1"
},
{
"created": "Thu, 7 May 2015 08:38:51 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Aug 2015 12:40:14 GMT",
"version": "v3"
}
] | 2015-08-24 | [
[
"Ebadi",
"H.",
""
],
[
"Moradpour",
"H.",
""
]
] | We consider a FRW universe filled by a dark energy candidate together with other possible sources which may include the baryonic and non-baryonic matters. Thereinafter, we consider a situation in which the cosmos sectors do not interact with each other. By applying the unified first law of thermodynamics on the apparen... |
2111.02880 | Julius Serbenta | Julius Serbenta, Miko{\l}aj Korzy\'nski | Bilocal geodesic operators in static spherically-symmetric spacetimes | 30 pages, 3 figures | null | 10.1088/1361-6382/ac79f3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method to compute exact expressions for optical observables for
static spherically symmetric spacetimes in the framework of the bilocal
geodesic operator formalism. The expressions are obtained by solving the linear
geodesic deviation equations for null geodesics, using the spacetime symmetries
and the a... | [
{
"created": "Thu, 4 Nov 2021 14:11:42 GMT",
"version": "v1"
}
] | 2022-07-20 | [
[
"Serbenta",
"Julius",
""
],
[
"Korzyński",
"Mikołaj",
""
]
] | We present a method to compute exact expressions for optical observables for static spherically symmetric spacetimes in the framework of the bilocal geodesic operator formalism. The expressions are obtained by solving the linear geodesic deviation equations for null geodesics, using the spacetime symmetries and the ass... |
2205.07470 | Ivan Costa e Silva | Ivan P. Costa e Silva, Jose Luis Flores, Jonatan Herrera | Omniscient foliations and the geometry of cosmological spacetimes | 19 pages, no figures | null | 10.1007/s10714-022-03033-z | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | We identify certain general geometric conditions on a foliation of a
spacetime (M,g) by timelike curves that will impede the existence of null
geodesic lines, especially if (M,g) possesses a compact Cauchy hypersurface.
The absence of such lines, in turn, yields well-known restrictions on the
geometry of cosmological... | [
{
"created": "Mon, 16 May 2022 06:43:05 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"Silva",
"Ivan P. Costa e",
""
],
[
"Flores",
"Jose Luis",
""
],
[
"Herrera",
"Jonatan",
""
]
] | We identify certain general geometric conditions on a foliation of a spacetime (M,g) by timelike curves that will impede the existence of null geodesic lines, especially if (M,g) possesses a compact Cauchy hypersurface. The absence of such lines, in turn, yields well-known restrictions on the geometry of cosmological s... |
gr-qc/9503059 | Jorge Pullin | Cayetano Di Bartolo, Rodolfo Gambini, Jorge Griego, Jorge Pullin | The space of states of quantum gravity in terms of loops and extended
loops: some remarks | 16 Pages, Revtex/epsf, one figure included. | J.Math.Phys. 36 (1995) 6510-6528 | 10.1063/1.531254 | CGPG-95/3-5 | gr-qc hep-th | null | This article reviews the status of several solutions to all the constraints
of quantum gravity that have been proposed in terms of loops and extended
loops. We discuss pitfalls of several of the results and in particular discuss
the issues of covariance and regularization of the constraints in terms of
extended loops... | [
{
"created": "Wed, 29 Mar 1995 21:35:07 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Di Bartolo",
"Cayetano",
""
],
[
"Gambini",
"Rodolfo",
""
],
[
"Griego",
"Jorge",
""
],
[
"Pullin",
"Jorge",
""
]
] | This article reviews the status of several solutions to all the constraints of quantum gravity that have been proposed in terms of loops and extended loops. We discuss pitfalls of several of the results and in particular discuss the issues of covariance and regularization of the constraints in terms of extended loops. ... |
2302.09041 | Daniel Mata-Pacheco | H. Garcia-Compean, D. Mata-Pacheco, L. Zapata | Ho\v{r}ava-Lifshitz $F(\bar{R})$ theories and the Swampland | 34 pages, 6 figures. All sections were improved. Subsection 4.5
added. References added | null | 10.3390/universe9110460 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The compatibility between the de Sitter Swampland conjecture and
Ho\v{r}ava--Lifshitz $F(\bar{R})$ theories with a flat FLRW metric is studied.
We first study the standard $f(R)$ theories and show that the only way in which
the dS conjecture can be made independent of $R$ is by considering a power law
of the form $f(... | [
{
"created": "Fri, 17 Feb 2023 18:16:55 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2023 20:21:08 GMT",
"version": "v2"
}
] | 2023-11-02 | [
[
"Garcia-Compean",
"H.",
""
],
[
"Mata-Pacheco",
"D.",
""
],
[
"Zapata",
"L.",
""
]
] | The compatibility between the de Sitter Swampland conjecture and Ho\v{r}ava--Lifshitz $F(\bar{R})$ theories with a flat FLRW metric is studied. We first study the standard $f(R)$ theories and show that the only way in which the dS conjecture can be made independent of $R$ is by considering a power law of the form $f(R)... |
1703.06415 | Fabio M. Mele | Fabio M. Mele | Quantum Metric and Entanglement on Spin Networks | 162 pages, 11 figures, Master Thesis | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the idea that, in the background-independent framework of a
Quantum Theory of Gravity, entanglement is expected to play a key role in the
reconstruction of spacetime geometry, we investigate the possibility of using
the formalism of Geometric Quantum Mechanics (GQM) to give a tensorial
characterization o... | [
{
"created": "Sun, 19 Mar 2017 10:28:20 GMT",
"version": "v1"
}
] | 2017-03-21 | [
[
"Mele",
"Fabio M.",
""
]
] | Motivated by the idea that, in the background-independent framework of a Quantum Theory of Gravity, entanglement is expected to play a key role in the reconstruction of spacetime geometry, we investigate the possibility of using the formalism of Geometric Quantum Mechanics (GQM) to give a tensorial characterization of ... |
gr-qc/0307007 | Adrian P. Gentle | Adrian P. Gentle, Nathan D. George, Arkady Kheyfets and Warner A.
Miller | The constraints as evolution equations for numerical relativity | 10 pages, updated to match published version | Class.Quant.Grav. 21 (2004) 83-92 | 10.1088/0264-9381/21/1/006 | null | gr-qc | null | The Einstein equations have proven surprisingly difficult to solve
numerically. A standard diagnostic of the problems which plague the field is
the failure of computational schemes to satisfy the constraints, which are
known to be mathematically conserved by the evolution equations. We describe a
new approach to rewr... | [
{
"created": "Tue, 1 Jul 2003 16:53:41 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Oct 2003 16:50:17 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Gentle",
"Adrian P.",
""
],
[
"George",
"Nathan D.",
""
],
[
"Kheyfets",
"Arkady",
""
],
[
"Miller",
"Warner A.",
""
]
] | The Einstein equations have proven surprisingly difficult to solve numerically. A standard diagnostic of the problems which plague the field is the failure of computational schemes to satisfy the constraints, which are known to be mathematically conserved by the evolution equations. We describe a new approach to rewrit... |
1504.06014 | Tiberiu Harko | Bogdan D\u{a}nil\u{a}, Tiberiu Harko, Zolt\'an Kov\'acs | Thin accretion disks around cold Bose-Einstein Condensate stars | 21 pages, 12 figures, accepted for publication in EPJC; reference
added | Eur. Phys. J. C (2015) 75:203 | 10.1140/epjc/s10052-015-3428-3 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Due to their superfluid properties some compact astrophysical objects, like
neutron or quark stars, may contain a significant part of their matter in the
form of a Bose-Einstein Condensate. Observationally distinguishing between
neutron/quark stars and Bose-Einstein Condensate stars is a major challenge for
this latt... | [
{
"created": "Thu, 23 Apr 2015 00:16:20 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 2015 10:54:40 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Dănilă",
"Bogdan",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Kovács",
"Zoltán",
""
]
] | Due to their superfluid properties some compact astrophysical objects, like neutron or quark stars, may contain a significant part of their matter in the form of a Bose-Einstein Condensate. Observationally distinguishing between neutron/quark stars and Bose-Einstein Condensate stars is a major challenge for this latter... |
2106.07958 | Philippe G. LeFloch | Philippe G. LeFloch | Singularity scattering laws for bouncing cosmologies: a brief overview | 16 pages | Developments in Lorentzian Geometry: GeLoCor 2020, Cordoba, Spain,
Feb. 1-5. Edited by: A.L. Albujer, M. Caballero, A. Garc\'ia-Parrado, J.
Herrera and R. Rubio. Springer Proc. Math. Stat., 2022 | null | null | gr-qc math.AP | http://creativecommons.org/licenses/by/4.0/ | For contracting/expanding bouncing cosmologies, the formulation of junction
conditions at a bouncing was recently revisited by the author in collaboration
with B. Le Floch and G. Veneziano. The regime of interest here is the so-called
quiescent regime, in which a monotone behavior of the metric is observed and
asympt... | [
{
"created": "Tue, 15 Jun 2021 08:19:07 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Mar 2022 16:23:32 GMT",
"version": "v2"
}
] | 2022-03-15 | [
[
"LeFloch",
"Philippe G.",
""
]
] | For contracting/expanding bouncing cosmologies, the formulation of junction conditions at a bouncing was recently revisited by the author in collaboration with B. Le Floch and G. Veneziano. The regime of interest here is the so-called quiescent regime, in which a monotone behavior of the metric is observed and asymptot... |
2205.03830 | Yuxuan Peng | Yuxuan Peng | New Anisotropic Gauss-Bonnet Black Holes in Five Dimensions at the
Critical Point | 8pages, no figures. arXiv admin note: text overlap with
arXiv:2105.08482 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain new vacuum static black hole solutions with anisotropic horizons in
Einstein-Gauss-Bonnet gravity with a negative cosmological constant in five
dimensions. The translational invariance along one direction on the
3-dimensional horizon cross section is broken. The Gauss-Bonnet coupling
{\alpha} is at the crit... | [
{
"created": "Sun, 8 May 2022 10:06:08 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jun 2022 03:37:32 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Jan 2024 03:33:20 GMT",
"version": "v3"
}
] | 2024-01-17 | [
[
"Peng",
"Yuxuan",
""
]
] | We obtain new vacuum static black hole solutions with anisotropic horizons in Einstein-Gauss-Bonnet gravity with a negative cosmological constant in five dimensions. The translational invariance along one direction on the 3-dimensional horizon cross section is broken. The Gauss-Bonnet coupling {\alpha} is at the critic... |
2101.04458 | Bibhas Majhi Ranjan | Bibhas Ranjan Majhi | Is instability near a black hole key for "thermalization'' of its
horizon? | Few comments added, to appear in General Relativity and Gravitation | null | null | null | gr-qc hep-th math-ph math.MP nlin.CD quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We put forward an attempt towards building a possible theoretical model to
understand the observer dependent thermalization of black hole horizon. The
near horizon Hamiltonian for a massless, chargeless particle is $xp$ type. This
is unstable in nature and so the horizon can induce instability in a system.
The partic... | [
{
"created": "Tue, 12 Jan 2021 13:05:37 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jan 2021 10:25:06 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Aug 2021 11:34:24 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Aug 2022 16:16:46 GMT",
"version": "v4"
}
] | 2022-08-12 | [
[
"Majhi",
"Bibhas Ranjan",
""
]
] | We put forward an attempt towards building a possible theoretical model to understand the observer dependent thermalization of black hole horizon. The near horizon Hamiltonian for a massless, chargeless particle is $xp$ type. This is unstable in nature and so the horizon can induce instability in a system. The particle... |
gr-qc/0110020 | Andreas Freise | A. Freise, M. M. Casey, S. Gossler, H. Grote, G. Heinzel, H. Lueck, D.
I. Robertson, K. A. Strain, H. Ward, B. Willke, J. Hough and K. Danzmann | Performance of a 1200m long suspended Fabry-Perot cavity | Amaldi 4 (Perth 2001) conference proceedings, 10 pages, 8 figures | null | 10.1088/0264-9381/19/7/322 | null | gr-qc | null | Using one arm of the Michelson interferometer and the power recycling mirror
of the interferometric gravitational wave detector GEO600, we created a
Fabry-Perot cavity with a length of 1200 m. The main purpose of this experiment
was to gather first experience with the main optics, its suspensions and the
correspondin... | [
{
"created": "Tue, 2 Oct 2001 14:55:02 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2001 15:07:32 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Freise",
"A.",
""
],
[
"Casey",
"M. M.",
""
],
[
"Gossler",
"S.",
""
],
[
"Grote",
"H.",
""
],
[
"Heinzel",
"G.",
""
],
[
"Lueck",
"H.",
""
],
[
"Robertson",
"D. I.",
""
],
[
"Strain",
"K. A.",... | Using one arm of the Michelson interferometer and the power recycling mirror of the interferometric gravitational wave detector GEO600, we created a Fabry-Perot cavity with a length of 1200 m. The main purpose of this experiment was to gather first experience with the main optics, its suspensions and the corresponding ... |
gr-qc/0302001 | Lawrence P. Horwitz | O. Oron and L.P. Horwitz | The conformal metric associated with the U(1) gauge of the Stueckelberg-
Schr\"odinger equation | Plain TeX, 9 pages | Found.Phys. 33 (2003) 1177-1187 | null | TAUP 2729-03 | gr-qc | null | We review the classical and quantum mechanics of Stueckelberg, and introduce
the compensation fields necessary for the gauge covariance of the Stueckelberg-
Schr\"odinger equation. To achieve this, one must introduce a fifth, Lorentz
scalar, compensation field, in addition to the four vector fields which
compensate t... | [
{
"created": "Sun, 2 Feb 2003 11:15:59 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2003 07:12:31 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Oron",
"O.",
""
],
[
"Horwitz",
"L. P.",
""
]
] | We review the classical and quantum mechanics of Stueckelberg, and introduce the compensation fields necessary for the gauge covariance of the Stueckelberg- Schr\"odinger equation. To achieve this, one must introduce a fifth, Lorentz scalar, compensation field, in addition to the four vector fields which compensate the... |
gr-qc/0511117 | Rafael Montemayor | Santiago A. Martinez, R. Montemayor and Luis F. Urrutia | Reality and causality in quantum gravity modified electrodynamics | 15 pages, LaTex, minor changes to clarify some points, version
accepted for publication | Phys.Rev. D74 (2006) 065020 | 10.1103/PhysRevD.74.065020 | null | gr-qc astro-ph hep-ph | null | We present a general description of the propagation properties of quantum
gravity modified electrodynamics characterized by constitutive relations up to
second order in the correction parameter. The effective description corresponds
to an electrodynamics in a dispersive and absorptive non-local medium, where
the Gree... | [
{
"created": "Mon, 21 Nov 2005 19:38:12 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Jun 2006 14:45:15 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Sep 2006 10:57:06 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Martinez",
"Santiago A.",
""
],
[
"Montemayor",
"R.",
""
],
[
"Urrutia",
"Luis F.",
""
]
] | We present a general description of the propagation properties of quantum gravity modified electrodynamics characterized by constitutive relations up to second order in the correction parameter. The effective description corresponds to an electrodynamics in a dispersive and absorptive non-local medium, where the Green ... |
2309.08497 | Takahiro Tanaka | Takahiro Tanaka and Yuko Urakawa | Statistical anisotropy of primordial gravitational waves from
generalized $\delta N$ formalism | 5pages, no figure | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In this letter, we demonstrate how to use the generalized $\delta N$
formalism, which enables us to compute all the large scale fluctuations,
including the gravitational waves, solely by solving the evolution of the
background homogeneous Universe. Using the Noether charge density, we derive an
analytic formula which... | [
{
"created": "Fri, 15 Sep 2023 16:01:41 GMT",
"version": "v1"
}
] | 2023-09-18 | [
[
"Tanaka",
"Takahiro",
""
],
[
"Urakawa",
"Yuko",
""
]
] | In this letter, we demonstrate how to use the generalized $\delta N$ formalism, which enables us to compute all the large scale fluctuations, including the gravitational waves, solely by solving the evolution of the background homogeneous Universe. Using the Noether charge density, we derive an analytic formula which d... |
gr-qc/0205097 | U\u{g}ur Camci | Yusuf Sucu and Nuri Unal | Solution of Massless Spin One Wave Equation in Robertson-Walker
Space-time | 16 Pages, Latex, no figures, An expanded version of paper published
in International Journal of Modern Physics A, 17 (2002) 1137 | Int.J.Mod.Phys. A17 (2002) 1137-1147 | 10.1142/S0217751X02005852 | null | gr-qc | null | We generalize the quantum spinor wave equation for photon into the curved
space-time and discuss the solutions of this equation in Robertson-Walker
space-time and compare them with the solution of the Maxwell equations in the
same space-time.
| [
{
"created": "Wed, 22 May 2002 11:57:08 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2005 14:38:47 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Sucu",
"Yusuf",
""
],
[
"Unal",
"Nuri",
""
]
] | We generalize the quantum spinor wave equation for photon into the curved space-time and discuss the solutions of this equation in Robertson-Walker space-time and compare them with the solution of the Maxwell equations in the same space-time. |
1410.5882 | John Miller | John Miller, Lisa Barsotti, Salvatore Vitale, Peter Fritschel, Daniel
Sigg and Matthew Evans | Prospects for doubling the range of Advanced LIGO | null | Phys. Rev. D 91, 062005 2015 | 10.1103/PhysRevD.91.062005 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the coming years, the gravitational wave community will be optimizing
detector performance for a variety of astrophysical sources that make competing
demands on the detector sensitivity in different frequency bands. In this paper
we describe a number of technologies that are being developed as anticipated
upgrades... | [
{
"created": "Tue, 21 Oct 2014 23:27:47 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2014 18:28:18 GMT",
"version": "v2"
}
] | 2015-03-31 | [
[
"Miller",
"John",
""
],
[
"Barsotti",
"Lisa",
""
],
[
"Vitale",
"Salvatore",
""
],
[
"Fritschel",
"Peter",
""
],
[
"Sigg",
"Daniel",
""
],
[
"Evans",
"Matthew",
""
]
] | In the coming years, the gravitational wave community will be optimizing detector performance for a variety of astrophysical sources that make competing demands on the detector sensitivity in different frequency bands. In this paper we describe a number of technologies that are being developed as anticipated upgrades t... |
2108.05772 | Hemwati Nandan | Shobhit Giri, Hemwati Nandan | Stability Analysis of Geodesics and Quasinormal Modes of a Dual Stringy
Black Hole Via Lyapunov Exponents | null | General Relativity and Gravitation, 53(8), pp.1-27 (2021) | 10.1007/s10714-021-02845-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the stability of both timelike as well as null circular
geodesics in the vicinity of a dual (3+1) dimensional stringy black hole (BH)
spacetime by using an excellent tool so-called Lyapunov exponent. The proper
time ($\tau$) Lyapunov exponent ($\lambda_{p}$) and coordinate time ($t$)
Lyapunov exponent~... | [
{
"created": "Thu, 12 Aug 2021 14:31:52 GMT",
"version": "v1"
}
] | 2021-08-13 | [
[
"Giri",
"Shobhit",
""
],
[
"Nandan",
"Hemwati",
""
]
] | We investigate the stability of both timelike as well as null circular geodesics in the vicinity of a dual (3+1) dimensional stringy black hole (BH) spacetime by using an excellent tool so-called Lyapunov exponent. The proper time ($\tau$) Lyapunov exponent ($\lambda_{p}$) and coordinate time ($t$) Lyapunov exponent~($... |
gr-qc/9909081 | Vesselin Petkov | Vesselin Petkov | Propagation of light in non-inertial reference frames | 14 pages, 1 figure, LaTeX, Section 4 has been devoted to the Sagnac
effect | Chap. 7 of "Relativity and the Nature of Spacetime," 2nd ed
(Springer, 2009) | null | null | gr-qc | null | It is shown that the complete description of the propagation of light in a
gravitational field and in non-inertial reference frames in general requires an
average coordinate and an average proper velocity of light. The need for an
average coordinate velocity of light in non-inertial frames is demonstrated by
consider... | [
{
"created": "Mon, 27 Sep 1999 05:39:19 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 1999 02:36:17 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Jan 2000 04:18:56 GMT",
"version": "v3"
},
{
"created": "Sun, 24 Jun 2001 22:11:46 GMT",
"version": "v4"
},
{
"cr... | 2011-11-18 | [
[
"Petkov",
"Vesselin",
""
]
] | It is shown that the complete description of the propagation of light in a gravitational field and in non-inertial reference frames in general requires an average coordinate and an average proper velocity of light. The need for an average coordinate velocity of light in non-inertial frames is demonstrated by considerin... |
1910.09690 | Wolfgang Tichy | Wolfgang Tichy, Alireza Rashti, Tim Dietrich, Reetika Dudi, Bernd
Br\"ugmann | Constructing Binary Neutron Star Initial Data with High Spins, High
Compactness, and High Mass-Ratios | 16 pages, 11 figures | Phys. Rev. D 100, 124046 (2019) | 10.1103/PhysRevD.100.124046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The construction of accurate and consistent initial data for various binary
parameters is a critical ingredient for numerical relativity simulations of the
compact binary coalescence. In this article, we present an upgrade of the
pseudospectral SGRID code, which enables us to access even larger regions of
the binary ... | [
{
"created": "Mon, 21 Oct 2019 23:07:14 GMT",
"version": "v1"
}
] | 2019-12-25 | [
[
"Tichy",
"Wolfgang",
""
],
[
"Rashti",
"Alireza",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Dudi",
"Reetika",
""
],
[
"Brügmann",
"Bernd",
""
]
] | The construction of accurate and consistent initial data for various binary parameters is a critical ingredient for numerical relativity simulations of the compact binary coalescence. In this article, we present an upgrade of the pseudospectral SGRID code, which enables us to access even larger regions of the binary ne... |
gr-qc/0601098 | Cristian Stelea | Eugen Radu, Cristian Stelea, D. H. Tchrakian | Features of gravity-Yang-Mills hierarchies in d-dimensions | 19 pages, 9 figures | Phys.Rev. D73 (2006) 084015 | 10.1103/PhysRevD.73.084015 | null | gr-qc hep-th | null | Higher dimensional, direct analogues of the usual d=4 Einstein--Yang-Mills
(EYM) systems are studied. These consist of the gravitational and Yang-Mills
hierarchies in d=4p dimensional spacetimes, both consisting of 2p-form
curvature terms only. Regular and black hole solutions are constructed in
$2p+2\le d \le 4p$, i... | [
{
"created": "Mon, 23 Jan 2006 23:12:24 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Radu",
"Eugen",
""
],
[
"Stelea",
"Cristian",
""
],
[
"Tchrakian",
"D. H.",
""
]
] | Higher dimensional, direct analogues of the usual d=4 Einstein--Yang-Mills (EYM) systems are studied. These consist of the gravitational and Yang-Mills hierarchies in d=4p dimensional spacetimes, both consisting of 2p-form curvature terms only. Regular and black hole solutions are constructed in $2p+2\le d \le 4p$, in ... |
2003.12571 | Akira Dohi | Akira Dohi, Ryotaro Kase, Rampei Kimura, Kazuhiro Yamamoto, Masa-aki
Hashimoto | Neutron star cooling in modified gravity theories | 34 pages, 35 figures; v2 - significantly revised with several
additional calculations, accepted for publication in PTEP | null | null | null | gr-qc astro-ph.CO astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study thermal evolution of isolated neutron stars in scalar-tensor
theories for the first time. Whether the rapid cooling due to the direct Urca
process occurs or not is an interesting question in the viewpoint of the
temperature observation of isolated neutron stars. Moreover, investigation of
the cooling effect ... | [
{
"created": "Fri, 27 Mar 2020 07:49:10 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2021 05:42:02 GMT",
"version": "v2"
}
] | 2021-07-27 | [
[
"Dohi",
"Akira",
""
],
[
"Kase",
"Ryotaro",
""
],
[
"Kimura",
"Rampei",
""
],
[
"Yamamoto",
"Kazuhiro",
""
],
[
"Hashimoto",
"Masa-aki",
""
]
] | We study thermal evolution of isolated neutron stars in scalar-tensor theories for the first time. Whether the rapid cooling due to the direct Urca process occurs or not is an interesting question in the viewpoint of the temperature observation of isolated neutron stars. Moreover, investigation of the cooling effect of... |
gr-qc/0410002 | Edward Teo | Kenneth Hong and Edward Teo | A new form of the rotating C-metric | 13 pages, LaTeX | Class.Quant.Grav.22:109-118,2005 | 10.1088/0264-9381/22/1/007 | null | gr-qc | null | In a previous paper, we showed that the traditional form of the charged
C-metric can be transformed, by a change of coordinates, into one with an
explicitly factorizable structure function. This new form of the C-metric has
the advantage that its properties become much simpler to analyze. In this
paper, we propose an... | [
{
"created": "Thu, 30 Sep 2004 23:35:00 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Hong",
"Kenneth",
""
],
[
"Teo",
"Edward",
""
]
] | In a previous paper, we showed that the traditional form of the charged C-metric can be transformed, by a change of coordinates, into one with an explicitly factorizable structure function. This new form of the C-metric has the advantage that its properties become much simpler to analyze. In this paper, we propose an a... |
2207.08513 | Diego S\'aez-Chill\'on G\'omez | Sergei D. Odintsov, Diego Saez-Chillon Gomez and German S. Sharov | Testing viable extensions of Einstein-Gauss-Bonnet gravity | 11 pages, 3 figures. To be published in Phys. of the Dark Universe | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some models within the framework of Gauss-Bonnet gravities are considered in
the presence of a non-minimally coupled scalar field. By imposing a particular
constraint on the scalar field coupling, an extension of the called
Einstein-Gauss-Bonnet gravity that keeps the correct speed of propagation for
gravitational wa... | [
{
"created": "Mon, 18 Jul 2022 11:09:26 GMT",
"version": "v1"
}
] | 2022-07-19 | [
[
"Odintsov",
"Sergei D.",
""
],
[
"Gomez",
"Diego Saez-Chillon",
""
],
[
"Sharov",
"German S.",
""
]
] | Some models within the framework of Gauss-Bonnet gravities are considered in the presence of a non-minimally coupled scalar field. By imposing a particular constraint on the scalar field coupling, an extension of the called Einstein-Gauss-Bonnet gravity that keeps the correct speed of propagation for gravitational wave... |
1007.2481 | Marc Lachieze-Rey | Marc Lachieze-Rey (APC) | Spin and Clifford algebras, an introduction | 40 pages ; published version with slight modifications for on-line
reading | 7th International Conference on Clifford Algebras and their
Applications, Toulouse (France) : France (2005) | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short pedagogical presentation, we introduce the spin groups and the
spinors from the point of view of group theory. We also present, independently,
the construction of the low dimensional Clifford algebras. And we establish the
link between the two approaches. Finally, we give some notions of the
generalisat... | [
{
"created": "Thu, 15 Jul 2010 06:00:33 GMT",
"version": "v1"
}
] | 2010-07-19 | [
[
"Lachieze-Rey",
"Marc",
"",
"APC"
]
] | In this short pedagogical presentation, we introduce the spin groups and the spinors from the point of view of group theory. We also present, independently, the construction of the low dimensional Clifford algebras. And we establish the link between the two approaches. Finally, we give some notions of the generalisatio... |
gr-qc/0502106 | L. C. Garcia de Andrade | L.C. Garcia de Andrade | The necessity of non-Riemannian acoustic spacetime in the fluids with
vorticity | Latex file | Phys.Lett. A346 (2005) 327-329 | 10.1016/j.physleta.2005.07.023 | null | gr-qc | null | The necessity of a newly proposed (PRD 70 (2004) 64004) non-Riemannian
acoustic spacetime structure called acoustic torsion of sound wave equation in
fluids with vorticity are discussed. It is shown that this structure, although
not always necessary is present in fluids with vorticity even when the
perturbation is ro... | [
{
"created": "Fri, 25 Feb 2005 07:08:01 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | The necessity of a newly proposed (PRD 70 (2004) 64004) non-Riemannian acoustic spacetime structure called acoustic torsion of sound wave equation in fluids with vorticity are discussed. It is shown that this structure, although not always necessary is present in fluids with vorticity even when the perturbation is rota... |
gr-qc/9711057 | Jelle Boersma | Jelle Boersma | Averaging in Cosmology | 24 pages, Latex, accepted for publication in Phys. Rev. D | Phys.Rev. D57 (1998) 798-810 | 10.1103/PhysRevD.57.798 | null | gr-qc | null | In this paper we discuss the effect of local inhomogeneities on the global
expansion of nearly FLRW universes, in a perturbative setting. We derive a
generic linearized averaging operation for metric perturbations from basic
assumptions, and we explicify the issue of gauge invariance. We derive a gauge
invariant expr... | [
{
"created": "Wed, 19 Nov 1997 13:31:23 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Boersma",
"Jelle",
""
]
] | In this paper we discuss the effect of local inhomogeneities on the global expansion of nearly FLRW universes, in a perturbative setting. We derive a generic linearized averaging operation for metric perturbations from basic assumptions, and we explicify the issue of gauge invariance. We derive a gauge invariant expres... |
gr-qc/0603018 | Mauricio Bellini | Alfredo Raya, Jose Edgar Madriz Aguilar (IFM, Michoacana University),
Mauricio Bellini (Mar del Plata University & CONICET) | Gravitoelectromagnetic inflation from a 5D vacuum state: a new formalism | final version (figure included) | Phys.Lett.B638:314-319,2006 | 10.1016/j.physletb.2006.05.068 | null | gr-qc | null | We propose a novel formalism for inflation from a 5D vacuum state which could
explain both, seeds of matter and magnetic fields in the early universe.
| [
{
"created": "Tue, 7 Mar 2006 22:35:35 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2006 21:42:57 GMT",
"version": "v2"
},
{
"created": "Fri, 26 May 2006 20:42:24 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Jun 2006 19:05:07 GMT",
"version": "v4"
},
{
"crea... | 2008-11-26 | [
[
"Raya",
"Alfredo",
"",
"IFM, Michoacana University"
],
[
"Aguilar",
"Jose Edgar Madriz",
"",
"IFM, Michoacana University"
],
[
"Bellini",
"Mauricio",
"",
"Mar del Plata University & CONICET"
]
] | We propose a novel formalism for inflation from a 5D vacuum state which could explain both, seeds of matter and magnetic fields in the early universe. |
1311.0744 | Lorenzo Sebastiani | L. Sebastiani, G. Cognola, R. Myrzakulov, S.D. Odintsov and S. Zerbini | Nearly Starobinsky inflation from modified gravity | 23 pages, minor revision done | Phys. Rev. D 89, 023518 (2014) | 10.1103/PhysRevD.89.023518 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study inflation induced by (power-low) scalar curvature corrections to
General Relativity. The class of inflationary scalar potentials
$V(\sigma)\sim\exp[n\,\sigma]$, $n$ general parameter, is investigated in the
Einsein frame and the corresponding actions in the Jordan frame are derived. We
found the conditions f... | [
{
"created": "Mon, 4 Nov 2013 16:00:38 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Sep 2014 10:41:00 GMT",
"version": "v2"
}
] | 2014-09-22 | [
[
"Sebastiani",
"L.",
""
],
[
"Cognola",
"G.",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Zerbini",
"S.",
""
]
] | We study inflation induced by (power-low) scalar curvature corrections to General Relativity. The class of inflationary scalar potentials $V(\sigma)\sim\exp[n\,\sigma]$, $n$ general parameter, is investigated in the Einsein frame and the corresponding actions in the Jordan frame are derived. We found the conditions for... |
1312.3057 | Jia Wang | Jia Wang, Wei Xu and Xin-he Meng | The Entropy Relations of Black Holes with Multihorizons in Higher
Dimensions | 9 pages, revtex4-1, Accepted for publication in Physical Review D | Phys. Rev. D 89, 044034 (2014) | 10.1103/PhysRevD.89.044034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the entropy relations of multi-horizons black holes in higher
dimensional (A)dS spacetime with maximal symmetries, including Einstein-Maxwell
gravity and $f(R)$(-Maxwell) gravity. These additional equalities in
thermodynamics are expected to be useful to understanding the origin of black
hole entropy at the ... | [
{
"created": "Wed, 11 Dec 2013 07:45:01 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Mar 2014 13:05:39 GMT",
"version": "v2"
}
] | 2014-03-04 | [
[
"Wang",
"Jia",
""
],
[
"Xu",
"Wei",
""
],
[
"Meng",
"Xin-he",
""
]
] | We study the entropy relations of multi-horizons black holes in higher dimensional (A)dS spacetime with maximal symmetries, including Einstein-Maxwell gravity and $f(R)$(-Maxwell) gravity. These additional equalities in thermodynamics are expected to be useful to understanding the origin of black hole entropy at the mi... |
gr-qc/0510060 | Filimonova Irina V | S.S. Gershtein, A.A. Logunov, M.A. Mestvirishvili | On Boundedness of the Admissible Time Slowing Down by the Gravitational
Field | 5 pages | null | 10.1134/S1028335806020017 | null | gr-qc | null | It is shown that there exists, in the field theory of gravitation, contrary
to the General Theory of Relativity (GTR), a bound for admissible time slowing
down by the gravitational field which excludes a possibility of unbounded
compression of matter by the gravity forces.
| [
{
"created": "Thu, 13 Oct 2005 08:24:51 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Gershtein",
"S. S.",
""
],
[
"Logunov",
"A. A.",
""
],
[
"Mestvirishvili",
"M. A.",
""
]
] | It is shown that there exists, in the field theory of gravitation, contrary to the General Theory of Relativity (GTR), a bound for admissible time slowing down by the gravitational field which excludes a possibility of unbounded compression of matter by the gravity forces. |
gr-qc/9512006 | Hans-Juergen Schmidt | Hans - Juergen Schmidt | How to measure spatial distances? | 4 pages, latex, no figures | Gen.Rel.Grav. 28 (1996) 899-903 | 10.1007/BF02104755 | Potsdam/Math 95/10 | gr-qc | null | The use of time--like geodesics to measure temporal distances is better
justified than the use of space--like geodesics for a measurement of spatial
distances. We give examples where a ''spatial distance'' cannot be
appropriately determined by the length of a space--like geodesic.
| [
{
"created": "Wed, 29 Nov 1995 17:17:28 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Schmidt",
"Hans - Juergen",
""
]
] | The use of time--like geodesics to measure temporal distances is better justified than the use of space--like geodesics for a measurement of spatial distances. We give examples where a ''spatial distance'' cannot be appropriately determined by the length of a space--like geodesic. |
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