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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2401.07766 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is Rosa, Daniela S. J. Cordeiro, Caio F. B. Macedo,
Francisco S. N. Lobo | Observational imprints of gravastars from accretion disks and hot-spots | 20 pages, 16 Figures. v2: published version | Phys. Rev. D 109, 084002 (2024) | 10.1103/PhysRevD.109.084002 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we analyze the observational properties of thin-shell
gravastars under two astrophysical frameworks, namely surrounded by
optically-thin accretion disks and orbited by hot-spots. We consider the
thin-shell gravastar model with two free parameters, the gravastar radius and
ratio of mass allocated at the ... | [
{
"created": "Mon, 15 Jan 2024 15:22:43 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2024 15:54:40 GMT",
"version": "v2"
}
] | 2024-04-02 | [
[
"Rosa",
"João Luís",
""
],
[
"Cordeiro",
"Daniela S. J.",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, we analyze the observational properties of thin-shell gravastars under two astrophysical frameworks, namely surrounded by optically-thin accretion disks and orbited by hot-spots. We consider the thin-shell gravastar model with two free parameters, the gravastar radius and ratio of mass allocated at the th... |
gr-qc/0005005 | Alexander Linden | Alexander N. Linden | Far Field Behavior of Noncompact Static Spherically Symmetric Solutions
of Einstein SU(2) Yang Mills Equations | 10 pages | J.Math.Phys.42:1196-1201,2001 | 10.1063/1.1287918 | null | gr-qc | null | The Einstein equations with small positive cosmological constant coupled to
an SU(2) Yang Mills field admits solutions that possess a coordinate
singularity at a noncritical radius. Here, we prove that these solutions are
otherwise globally smooth and that they asymptotically approach Schwarzschild
deSitter space wit... | [
{
"created": "Mon, 1 May 2000 22:36:23 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Linden",
"Alexander N.",
""
]
] | The Einstein equations with small positive cosmological constant coupled to an SU(2) Yang Mills field admits solutions that possess a coordinate singularity at a noncritical radius. Here, we prove that these solutions are otherwise globally smooth and that they asymptotically approach Schwarzschild deSitter space with ... |
1811.00736 | Narayan Banerjee | Abhijit Chakraborty, Narayan Banerjee, Anandamohan Ghosh | Thawing vs. Tracker Solutions: A Dynamical Systems Approach | 13 pages, 7 figures | null | 10.1007/s10714-018-2487-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A comparative study of thawing and tracking models of dark energy is carried
out with the help of a dynamical systems analysis. It is found that both of
them have stable solutions which are consistent with the requirement of a dark
energy. So none of them is actually favored from the consideration of
stability. The t... | [
{
"created": "Fri, 2 Nov 2018 04:40:12 GMT",
"version": "v1"
}
] | 2018-12-26 | [
[
"Chakraborty",
"Abhijit",
""
],
[
"Banerjee",
"Narayan",
""
],
[
"Ghosh",
"Anandamohan",
""
]
] | A comparative study of thawing and tracking models of dark energy is carried out with the help of a dynamical systems analysis. It is found that both of them have stable solutions which are consistent with the requirement of a dark energy. So none of them is actually favored from the consideration of stability. The tra... |
2305.17487 | Yu Shi | Dawei Wu, Shan-Chang Tang, Yu Shi | Accelerating Unruh-DeWitt detectors coupled with a spinor field | 30 pages | null | 10.1007/JHEP06(2023)190 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The behavior of accelerating Unruh-DeWitt detectors coupled with a spinor
field in (3+1)-dimensional spacetime is investigated. For a single point-like
detector with Gaussian switching function, the transition probability increases
with the acceleration and thus the antiUnruh effect effect cannot occur. Due to
the sp... | [
{
"created": "Sat, 27 May 2023 14:42:59 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Wu",
"Dawei",
""
],
[
"Tang",
"Shan-Chang",
""
],
[
"Shi",
"Yu",
""
]
] | The behavior of accelerating Unruh-DeWitt detectors coupled with a spinor field in (3+1)-dimensional spacetime is investigated. For a single point-like detector with Gaussian switching function, the transition probability increases with the acceleration and thus the antiUnruh effect effect cannot occur. Due to the spin... |
1105.5235 | Jose Natario | Pedro G. Henriques and Jose Natario | The rocket problem in general relativity | 21 pages, 3 figures; v2: several changes to improve clarity,
including a new derivation of the rocket equation; matches final published
version | J. Optim. Theory Appl. 154 (2012) 500-524 | null | null | gr-qc cs.SY math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the covariant optimality conditions for rocket trajectories in
general relativity, with and without a bound on the magnitude of the proper
acceleration. The resulting theory is then applied to solve two specific
problems: the minimum fuel consumption transfer between two galaxies in a FLRW
model, and betwee... | [
{
"created": "Thu, 26 May 2011 09:05:12 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2012 07:20:58 GMT",
"version": "v2"
}
] | 2012-07-16 | [
[
"Henriques",
"Pedro G.",
""
],
[
"Natario",
"Jose",
""
]
] | We derive the covariant optimality conditions for rocket trajectories in general relativity, with and without a bound on the magnitude of the proper acceleration. The resulting theory is then applied to solve two specific problems: the minimum fuel consumption transfer between two galaxies in a FLRW model, and between ... |
0811.1698 | Yungui Gong | Xi-ming Chen and Yungui Gong | Fixed points in interacting dark energy models | v3: 5 figures and 2 tables, add discussions on perturbations and
motivations for the interaction, main results unchanged. PLB in press | Phys.Lett.B675:9-13,2009 | 10.1016/j.physletb.2009.03.064 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamical behaviors of two interacting dark energy models are considered.
In addition to the scaling attractors found in the non-interacting quintessence
model with exponential potential, new accelerated scaling attractors are also
found in the interacting dark energy models. The coincidence problem is reduced
to... | [
{
"created": "Tue, 11 Nov 2008 12:37:06 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Nov 2008 10:00:45 GMT",
"version": "v2"
},
{
"created": "Sat, 4 Apr 2009 07:41:49 GMT",
"version": "v3"
}
] | 2011-03-28 | [
[
"Chen",
"Xi-ming",
""
],
[
"Gong",
"Yungui",
""
]
] | The dynamical behaviors of two interacting dark energy models are considered. In addition to the scaling attractors found in the non-interacting quintessence model with exponential potential, new accelerated scaling attractors are also found in the interacting dark energy models. The coincidence problem is reduced to t... |
2312.11558 | Kyosuke Tomonari | Kyosuke Tomonari | A unified description of curvature, torsion, and non-metricity of the
metric-affine geometry with the M\"{o}bius representation | 29 pages. v2: 31 pages, moved some topics to appendix, added comments | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the mathematical fundamentals for a unified description of
curvature, torsion, and non-metricity 2-forms in the way extending the
so-called M\"{o}bius representation of the affine group, which is the method to
convert the semi-direct product into the ordinary matrix product, to revive the
fertility of ga... | [
{
"created": "Sun, 17 Dec 2023 10:36:20 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2024 10:11:21 GMT",
"version": "v2"
}
] | 2024-05-22 | [
[
"Tomonari",
"Kyosuke",
""
]
] | We establish the mathematical fundamentals for a unified description of curvature, torsion, and non-metricity 2-forms in the way extending the so-called M\"{o}bius representation of the affine group, which is the method to convert the semi-direct product into the ordinary matrix product, to revive the fertility of gaug... |
gr-qc/0608109 | Margus Saal | Laur Jarv, Piret Kuusk, Margus Saal | The dynamics of scalar-tensor cosmology from RS two-brane model | 25 pages, 8 figures | Phys.Rev.D75:023505,2007 | 10.1103/PhysRevD.75.023505 | null | gr-qc hep-th | null | We consider a Randall-Sundrum two-brane cosmological model in the low energy
gradient expansion approximation by Kanno and Soda. It is a scalar-tensor
theory with a specific coupling function and a specific potential. Upon
introducing the FLRW metric and perfect fluid matter on both branes in the
Jordan frame, the ef... | [
{
"created": "Thu, 24 Aug 2006 18:33:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jarv",
"Laur",
""
],
[
"Kuusk",
"Piret",
""
],
[
"Saal",
"Margus",
""
]
] | We consider a Randall-Sundrum two-brane cosmological model in the low energy gradient expansion approximation by Kanno and Soda. It is a scalar-tensor theory with a specific coupling function and a specific potential. Upon introducing the FLRW metric and perfect fluid matter on both branes in the Jordan frame, the effe... |
2112.08773 | Sreenath Kizhakkumpurath Manikandan | Sreenath K. Manikandan and Karthik Rajeev | New Kind of Echo from Quantum Black Holes | 10 pages, 2 figures. Title modified to match the published version | null | 10.1103/PhysRevD.105.064024 | null | gr-qc cond-mat.mes-hall quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that a quantum black hole can produce a new kind of late-time
gravitational echoes, facilitated by a near-horizon process analogous to
Andreev reflection in condensed matter systems. In comparison to the
traditional echo scenarios where the near-horizon region is treated as an
ordinary reflector, we argue ... | [
{
"created": "Thu, 16 Dec 2021 10:36:47 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Mar 2022 15:53:04 GMT",
"version": "v2"
}
] | 2022-03-16 | [
[
"Manikandan",
"Sreenath K.",
""
],
[
"Rajeev",
"Karthik",
""
]
] | We propose that a quantum black hole can produce a new kind of late-time gravitational echoes, facilitated by a near-horizon process analogous to Andreev reflection in condensed matter systems. In comparison to the traditional echo scenarios where the near-horizon region is treated as an ordinary reflector, we argue th... |
2211.16060 | Mohammad Vahid Takook | M.V. Takook | Axiomatic de Sitter quantum Yang-Mills theory with color confinement and
mass gap | 9 pages | EPL, 141 (2023) 22003 | 10.1209/0295-5075/acb0f9 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The analyticity property of de Sitter's quantum Yang-Mills theory in the
framework of Kerin space quantization, including quantum metric fluctuation, is
demonstrated. This property completes our previous work regarding quantum
Yang-Mills theory in de Sitter's ambient space formalism, and we can construct
an axiomatic... | [
{
"created": "Tue, 29 Nov 2022 10:10:48 GMT",
"version": "v1"
}
] | 2023-01-20 | [
[
"Takook",
"M. V.",
""
]
] | The analyticity property of de Sitter's quantum Yang-Mills theory in the framework of Kerin space quantization, including quantum metric fluctuation, is demonstrated. This property completes our previous work regarding quantum Yang-Mills theory in de Sitter's ambient space formalism, and we can construct an axiomatic q... |
gr-qc/9610034 | Piotr Chrusciel | R.Beig and P.T. Chru\'sciel | The isometry groups of asymptotically flat, asymptotically empty
space-times with timelike ADM four-momentum | Latex with amssymb, 16 pages | Commun.Math.Phys. 188 (1997) 585-597 | 10.1007/s002200050180 | null | gr-qc | null | We give a complete classification of all connected isometry groups, together
with their actions in the asymptotic region, in asymptotically flat,
asymptotically vacuum space--times with timelike ADM four--momentum.
| [
{
"created": "Wed, 16 Oct 1996 08:57:20 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Beig",
"R.",
""
],
[
"Chruściel",
"P. T.",
""
]
] | We give a complete classification of all connected isometry groups, together with their actions in the asymptotic region, in asymptotically flat, asymptotically vacuum space--times with timelike ADM four--momentum. |
2106.13942 | Xu Wei | Yuan-zhang Cui, Wei Xu and Bin Zhu | Hawking-Page transition with reentrance and triple point in Gauss-Bonnet
gravity | 21 pages, 11 figures; some references added; | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a new family of Hawking-Page (HP) transition, the HP
transition with reentrance and triple point is introduced for the first time,
by investigating HP transition of hyperbolic AdS black hole in extended
thermodynamics of general dimensional Gauss-Bonnet gravity. The Reentrant HP
transition is composed ... | [
{
"created": "Sat, 26 Jun 2021 05:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jun 2021 16:49:23 GMT",
"version": "v2"
}
] | 2021-06-30 | [
[
"Cui",
"Yuan-zhang",
""
],
[
"Xu",
"Wei",
""
],
[
"Zhu",
"Bin",
""
]
] | In this paper, a new family of Hawking-Page (HP) transition, the HP transition with reentrance and triple point is introduced for the first time, by investigating HP transition of hyperbolic AdS black hole in extended thermodynamics of general dimensional Gauss-Bonnet gravity. The Reentrant HP transition is composed of... |
1909.02208 | Andras Laszlo | Lars Andersson, Andras Laszlo, Blazej Ruba | Nilpotent symmetries as a mechanism for Grand Unification | final published version | JHEP 05 (2021) 240 | 10.1007/JHEP05(2021)240 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the classic Coleman--Mandula no-go theorem which prohibits the unification
of internal and spacetime symmetries, the assumption of the existence of a
positive definite invariant scalar product on the Lie algebra of the internal
group is essential. If one instead allows the scalar product to be positive
semi-defini... | [
{
"created": "Thu, 5 Sep 2019 04:45:57 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 2020 15:53:36 GMT",
"version": "v2"
},
{
"created": "Wed, 26 May 2021 14:51:58 GMT",
"version": "v3"
}
] | 2021-05-27 | [
[
"Andersson",
"Lars",
""
],
[
"Laszlo",
"Andras",
""
],
[
"Ruba",
"Blazej",
""
]
] | In the classic Coleman--Mandula no-go theorem which prohibits the unification of internal and spacetime symmetries, the assumption of the existence of a positive definite invariant scalar product on the Lie algebra of the internal group is essential. If one instead allows the scalar product to be positive semi-definite... |
2403.13019 | S. Ganesh | S Ganesh | Many body gravity and the galaxy rotation curves | 13 pages, 6 figures | null | null | null | gr-qc astro-ph.GA hep-ph hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | A novel theory was proposed earlier to model systems with thermal gradients,
based on the postulate that the spatial and temporal variation in temperature
can be recast as a variation in the metric. Combining the variation in the
metric due to the thermal variations and gravity, leads to the concept of
thermal gravit... | [
{
"created": "Mon, 18 Mar 2024 13:30:02 GMT",
"version": "v1"
}
] | 2024-03-21 | [
[
"Ganesh",
"S",
""
]
] | A novel theory was proposed earlier to model systems with thermal gradients, based on the postulate that the spatial and temporal variation in temperature can be recast as a variation in the metric. Combining the variation in the metric due to the thermal variations and gravity, leads to the concept of thermal gravity ... |
gr-qc/0601041 | Steven Carlip | S. Carlip | Horizons, Constraints, and Black Hole Entropy | 16 pages, talk given at the "Peyresq Physics 10 Meeting on Micro and
Macro structures of spacetime" | Int.J.Theor.Phys.46:2192-2203,2007 | 10.1007/s10773-007-9340-3 | null | gr-qc | null | Black hole entropy appears to be ``universal''--many independent
calculations, involving models with very different microscopic degrees of
freedom, all yield the same density of states. I discuss the proposal that this
universality comes from the behavior of the underlying symmetries of the
classical theory. To impos... | [
{
"created": "Tue, 10 Jan 2006 21:22:02 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
]
] | Black hole entropy appears to be ``universal''--many independent calculations, involving models with very different microscopic degrees of freedom, all yield the same density of states. I discuss the proposal that this universality comes from the behavior of the underlying symmetries of the classical theory. To impose ... |
1510.00594 | Jansen Formiga | J. B. Formiga | Analyzing the radial geodesics of the Campanelli-Lousto solutions | To be published in General Relativity and Gravitation | null | 10.1007/s10714-015-1967-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When dealing with a spacetime, one usually searches for singularities, black
holes, white holes and wormholes due to their importance to the motion of
particles. There is a family of solution of the Brans-Dicke vacuum equations
that has not been fully studied from this perspective. In this paper, I study
some propert... | [
{
"created": "Fri, 25 Sep 2015 16:31:22 GMT",
"version": "v1"
}
] | 2015-11-17 | [
[
"Formiga",
"J. B.",
""
]
] | When dealing with a spacetime, one usually searches for singularities, black holes, white holes and wormholes due to their importance to the motion of particles. There is a family of solution of the Brans-Dicke vacuum equations that has not been fully studied from this perspective. In this paper, I study some propertie... |
1509.06159 | Prado Martin-Moruno | Prado Martin-Moruno, Nelson J. Nunes, Francisco S. N. Lobo | Accelerating Horndeski cosmologies screening the vacuum energy | 6 pages; contribution to the proceedings of "The Fourtheenth Marcel
Grossmann Meeting on General Relativity", University of Rome "La Sapienza",
Rome, July 12-18, 2015, based on a talk delivered at the AT1 parallel session | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of Horndeski cosmologies, we consider a dynamical adjustment
mechanism able to screen any value of the vacuum energy of the matter fields
leading to a fixed de Sitter geometry. Thus, we present the most general
scalar-tensor cosmological models without higher than second order derivatives
in the field ... | [
{
"created": "Mon, 21 Sep 2015 09:24:04 GMT",
"version": "v1"
}
] | 2015-09-22 | [
[
"Martin-Moruno",
"Prado",
""
],
[
"Nunes",
"Nelson J.",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In the context of Horndeski cosmologies, we consider a dynamical adjustment mechanism able to screen any value of the vacuum energy of the matter fields leading to a fixed de Sitter geometry. Thus, we present the most general scalar-tensor cosmological models without higher than second order derivatives in the field eq... |
2004.01131 | Arun Kumar | Arun Kumar, Dharmanand Baboolal and Sushant G. Ghosh | Nonsingular Black Holes in $4D$ Einstein--Gauss--Bonnet Gravity | 5 figures, 3 tables. This was an invited manuscript published in the
special issue "Dark Matter and Dark Energy: Particle Physics, Cosmology, and
Experimental Searches". Matched to published version | Universe 8 (2022) 4, 244 | 10.3390/universe8040244 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Recently, several methods have been proposed to regularize a $D \to 4$ limit
of Einstein-Gauss-Bonnet (EGB), leading to nontrivial gravitational dynamics in
$4D$. We present an exact nonsingular black hole solution in the $4D$ EGB
gravity coupled to non-linear electrodynamics and analyze their thermodynamic
propertie... | [
{
"created": "Thu, 2 Apr 2020 17:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 10:38:24 GMT",
"version": "v2"
}
] | 2022-04-19 | [
[
"Kumar",
"Arun",
""
],
[
"Baboolal",
"Dharmanand",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | Recently, several methods have been proposed to regularize a $D \to 4$ limit of Einstein-Gauss-Bonnet (EGB), leading to nontrivial gravitational dynamics in $4D$. We present an exact nonsingular black hole solution in the $4D$ EGB gravity coupled to non-linear electrodynamics and analyze their thermodynamic properties ... |
2303.02592 | Pradip Kumar Chattopadhyay Dr. | D. Bhattacharjee and P. K. Chattopadhyay | Stable Charged Gravastar model in Cylindrically Symmetric Space-time | 12 pages, 4 figures | Phys. Scr. 98 (2023) 085013 | 10.1088/1402-4896/ace483 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this paper, we have extended the idea of gravitational Bose-Einstein
condensate star (gravastar) to charged gravastar system and explored the role
of charge in gravastar formation and its properties. We have used the most
general line element in cylindrically symmetric space-time. In this approach
the existence of... | [
{
"created": "Sun, 5 Mar 2023 07:32:48 GMT",
"version": "v1"
}
] | 2023-08-25 | [
[
"Bhattacharjee",
"D.",
""
],
[
"Chattopadhyay",
"P. K.",
""
]
] | In this paper, we have extended the idea of gravitational Bose-Einstein condensate star (gravastar) to charged gravastar system and explored the role of charge in gravastar formation and its properties. We have used the most general line element in cylindrically symmetric space-time. In this approach the existence of s... |
1607.00745 | Avneet Singh | Avneet Singh, Maria Alessandra Papa, Heinz-Bernd Eggenstein, Sylvia
Zhu, Holger Pletsch, Bruce Allen, Oliver Bock, Bernd Maschenchalk, Reinhard
Prix, Xavier Siemens | Results of an all-sky high-frequency Einstein@Home search for continuous
gravitational waves in LIGO's fifth science run | 13 pages, 10 figures, 5 tables; v1: initial submission; v2: internal
review; v3-4: journal review; v5: copyedited version; v6-7 (final): updated
references and minor typos corrected | Phys. Rev. D 94, 064061 (2016) | 10.1103/PhysRevD.94.064061 | LIGO Document LIGO-P1600196 | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results of a high-frequency all-sky search for continuous
gravitational waves from isolated compact objects in LIGO's 5th Science Run
(S5) data, using the computing power of the Einstein@Home volunteer computing
project. This is the only dedicated continuous gravitational wave search that
probes this high ... | [
{
"created": "Mon, 4 Jul 2016 06:17:20 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2016 13:32:00 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Aug 2016 09:13:35 GMT",
"version": "v3"
},
{
"created": "Wed, 31 Aug 2016 10:22:43 GMT",
"version": "v4"
},
{
"cr... | 2017-10-10 | [
[
"Singh",
"Avneet",
""
],
[
"Papa",
"Maria Alessandra",
""
],
[
"Eggenstein",
"Heinz-Bernd",
""
],
[
"Zhu",
"Sylvia",
""
],
[
"Pletsch",
"Holger",
""
],
[
"Allen",
"Bruce",
""
],
[
"Bock",
"Oliver",
""
],
... | We present results of a high-frequency all-sky search for continuous gravitational waves from isolated compact objects in LIGO's 5th Science Run (S5) data, using the computing power of the Einstein@Home volunteer computing project. This is the only dedicated continuous gravitational wave search that probes this high fr... |
gr-qc/0606133 | Helmut Friedrich | Helmut Friedrich | Static vacuum solutions from convergent null data expansions at
space-like infinity | 65 pages | Annales Henri Poincare 8:817-884,2007 | 10.1007/s00023-006-0323-3 | null | gr-qc | null | We study formal expansions of asymptotically flat solutions to the static
vacuum field equations which are determined by minimal sets of freely
specifyable data referred to as `null data'. These are given by sequences of
symmetric trace free tensors at space-like infinity of increasing order. They
are 1:1 related to ... | [
{
"created": "Fri, 30 Jun 2006 10:37:12 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Friedrich",
"Helmut",
""
]
] | We study formal expansions of asymptotically flat solutions to the static vacuum field equations which are determined by minimal sets of freely specifyable data referred to as `null data'. These are given by sequences of symmetric trace free tensors at space-like infinity of increasing order. They are 1:1 related to th... |
1204.0753 | Mauricio Cataldo MC | Mauricio Cataldo and Sergio del Campo | Two-fluid evolving Lorentzian wormholes | 8 pages, to be published in Phys. Rev D | null | 10.1103/PhysRevD.85.104010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the evolution of a family of wormholes sustained by two matter
components: one with homogeneous and isotropic properties $\rho(t)$ and another
inhomogeneous and anisotropic $\rho_{in}(t,r)$. The rate of expansion of these
evolving wormholes is only determined by the isotropic and homogeneous matter
com... | [
{
"created": "Tue, 3 Apr 2012 18:11:33 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Cataldo",
"Mauricio",
""
],
[
"del Campo",
"Sergio",
""
]
] | We investigate the evolution of a family of wormholes sustained by two matter components: one with homogeneous and isotropic properties $\rho(t)$ and another inhomogeneous and anisotropic $\rho_{in}(t,r)$. The rate of expansion of these evolving wormholes is only determined by the isotropic and homogeneous matter compo... |
gr-qc/9609040 | Marco Bruni | Marco Bruni, Sabino Matarrese, Silvia Mollerach, Sebastiano Sonego | Perturbations of spacetime: gauge transformations and gauge invariance
at second order and beyond | slightly revised version, accepted for publication in Classical and
Quantum Gravity. 27 pages including 4 figures, latex using 2 CQG style files:
ioplppt.sty, iopl10.sty | Class.Quant.Grav. 14 (1997) 2585-2606 | 10.1088/0264-9381/14/9/014 | null | gr-qc astro-ph | null | We consider in detail the problem of gauge dependence that exists in
relativistic perturbation theory, going beyond the linear approximation and
treating second and higher order perturbations. We first derive some
mathematical results concerning the Taylor expansion of tensor fields under the
action of one-parameter ... | [
{
"created": "Fri, 13 Sep 1996 17:33:46 GMT",
"version": "v1"
},
{
"created": "Thu, 22 May 1997 09:40:44 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Bruni",
"Marco",
""
],
[
"Matarrese",
"Sabino",
""
],
[
"Mollerach",
"Silvia",
""
],
[
"Sonego",
"Sebastiano",
""
]
] | We consider in detail the problem of gauge dependence that exists in relativistic perturbation theory, going beyond the linear approximation and treating second and higher order perturbations. We first derive some mathematical results concerning the Taylor expansion of tensor fields under the action of one-parameter fa... |
1303.5695 | Roberto Onofrio | Roberto Onofrio | Gravitational vacuum polarization phenomena due to the Higgs field | null | European Physical Journal C 72, 2006 (2012) | 10.1140/epjc/s10052-012-2006-1 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the standard model the mass of elementary particles is considered as a
dynamical property emerging from their interaction with the Higgs field. We
show that this assumption implies peculiar deviations from the law of universal
gravitation in its distance and mass dependence, as well as from the
superposition princ... | [
{
"created": "Fri, 22 Mar 2013 19:33:12 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Onofrio",
"Roberto",
""
]
] | In the standard model the mass of elementary particles is considered as a dynamical property emerging from their interaction with the Higgs field. We show that this assumption implies peculiar deviations from the law of universal gravitation in its distance and mass dependence, as well as from the superposition princip... |
1506.06452 | Stephen Green | Stephen R. Green and Robert M. Wald | Comments on Backreaction | v1: 10 pages; v2: 11 pages, updated to correspond to published
version of Buchert et al. [arXiv:1505.07800] | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We respond to the criticisms of a recent paper of Buchert et al.
[arXiv:1505.07800]
| [
{
"created": "Mon, 22 Jun 2015 03:32:52 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2015 01:02:46 GMT",
"version": "v2"
}
] | 2015-11-02 | [
[
"Green",
"Stephen R.",
""
],
[
"Wald",
"Robert M.",
""
]
] | We respond to the criticisms of a recent paper of Buchert et al. [arXiv:1505.07800] |
2401.15789 | Karl Svozil | Karl Svozil | `Anti-Gravity' inside a Menger Sponge | 5 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This speculative argument proposes that within a physical, ponderable model
of space-time, anti-gravity may naturally arise. The central concept involves a
paradigm shift from `adding stuff' to `thinning out,' wherein the local
geometry of space-time, as perceived by embedded observers, plays a crucial
role. In this ... | [
{
"created": "Sun, 28 Jan 2024 22:39:02 GMT",
"version": "v1"
}
] | 2024-01-30 | [
[
"Svozil",
"Karl",
""
]
] | This speculative argument proposes that within a physical, ponderable model of space-time, anti-gravity may naturally arise. The central concept involves a paradigm shift from `adding stuff' to `thinning out,' wherein the local geometry of space-time, as perceived by embedded observers, plays a crucial role. In this co... |
0705.2365 | Salvatore Antoci | S. Antoci, L. Mihich | The issue of photons in dielectrics: Hamiltonian viewpoint | 12 pages, one figure; text to appear in Nuovo Cimento B | Nuovo Cim.B122:413-424, 2007 | 10.1393/ncb/i2007-10367-9 | null | gr-qc quant-ph | null | The definition of the photon in the vacuum of general relativity provided by
Kermack et al. and by Synge is extended to nondispersive, nonhomogeneous,
isotropic dielectrics in arbitrary motion by Hamiltonian methods that rely on
Gordon's effective metric. By these methods the old dilemma, whether the
momentum-energy ... | [
{
"created": "Wed, 16 May 2007 17:30:35 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2007 14:56:46 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Antoci",
"S.",
""
],
[
"Mihich",
"L.",
""
]
] | The definition of the photon in the vacuum of general relativity provided by Kermack et al. and by Synge is extended to nondispersive, nonhomogeneous, isotropic dielectrics in arbitrary motion by Hamiltonian methods that rely on Gordon's effective metric. By these methods the old dilemma, whether the momentum-energy ve... |
gr-qc/0207095 | Harald P. Pfeiffer | Harald P. Pfeiffer and James W. York | Extrinsic Curvature and the Einstein Constraints | 8 pages, no figures; added new section; significant polishing of text | Phys.Rev. D67 (2003) 044022 | 10.1103/PhysRevD.67.044022 | null | gr-qc | null | The Einstein initial-value equations in the extrinsic curvature (Hamiltonian)
representation and conformal thin sandwich (Lagrangian) representation are
brought into complete conformity by the use of a decomposition of symmetric
tensors which involves a weight function. In stationary spacetimes, there is a
natural ch... | [
{
"created": "Wed, 24 Jul 2002 16:57:27 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Nov 2002 23:27:30 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Pfeiffer",
"Harald P.",
""
],
[
"York",
"James W.",
""
]
] | The Einstein initial-value equations in the extrinsic curvature (Hamiltonian) representation and conformal thin sandwich (Lagrangian) representation are brought into complete conformity by the use of a decomposition of symmetric tensors which involves a weight function. In stationary spacetimes, there is a natural choi... |
gr-qc/0606089 | Lee Samuel Finn | Matthew J. Benacquista, Lee Samuel Finn, Shane L. Larson, Louis J.
Rubbo | Addressing LISA Science Analysis Challenges | 7 pages | null | null | null | gr-qc | null | The principal goal of the \emph{LISA Science Analysis Workshop} is to
encourage the development and maturation of science analysis technology in
preparation for LISA science operations. Exactly because LISA is a pathfinder
for a new scientific discipline -- gravitational wave astronomy -- LISA data
processing and sci... | [
{
"created": "Wed, 21 Jun 2006 03:04:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Benacquista",
"Matthew J.",
""
],
[
"Finn",
"Lee Samuel",
""
],
[
"Larson",
"Shane L.",
""
],
[
"Rubbo",
"Louis J.",
""
]
] | The principal goal of the \emph{LISA Science Analysis Workshop} is to encourage the development and maturation of science analysis technology in preparation for LISA science operations. Exactly because LISA is a pathfinder for a new scientific discipline -- gravitational wave astronomy -- LISA data processing and scien... |
gr-qc/0401062 | Steven Willison | Elias Gravanis and Steven Willison | Intersecting hypersurfaces, topological densities and Lovelock Gravity | 24 pages, 2 figures, version 4: lengthened introduction, section on
explicit junction conditions for intersections added. Accepted in Journal of
Geometry and Physics | J.Geom.Phys.57:1861-1882,2007 | 10.1016/j.geomphys.2007.03.005 | null | gr-qc hep-th | null | Intersecting hypersurfaces in classical Lovelock gravity are studied
exploiting the description of the Lovelock Lagrangian as a sum of dimensionally
continued Euler densities. We wish to present an interesting geometrical
approach to the problem. The analysis allows us to deal most efficiently with
the division of sp... | [
{
"created": "Wed, 14 Jan 2004 22:01:57 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jan 2004 16:15:24 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Oct 2004 23:30:59 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Mar 2007 18:58:41 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Gravanis",
"Elias",
""
],
[
"Willison",
"Steven",
""
]
] | Intersecting hypersurfaces in classical Lovelock gravity are studied exploiting the description of the Lovelock Lagrangian as a sum of dimensionally continued Euler densities. We wish to present an interesting geometrical approach to the problem. The analysis allows us to deal most efficiently with the division of spac... |
1805.08886 | Christina Sormani | Christina Sormani | Oberwolfach Report: Spacetime Intrinsic Flat Convergence | 3 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This Oberwolfach report describes published work with Carlos Vega introducing
the null distance on a spacetime, and announces unpublished applications of
this work jointly with Carlos Vega and with Anna Sakovich applying the null
distance to define a spacetime intrinsic flat convergence (SF convergence). The
announce... | [
{
"created": "Tue, 22 May 2018 22:22:28 GMT",
"version": "v1"
}
] | 2018-05-24 | [
[
"Sormani",
"Christina",
""
]
] | This Oberwolfach report describes published work with Carlos Vega introducing the null distance on a spacetime, and announces unpublished applications of this work jointly with Carlos Vega and with Anna Sakovich applying the null distance to define a spacetime intrinsic flat convergence (SF convergence). The announced ... |
gr-qc/0006061 | Carlo Rovelli | Carlo Rovelli | Notes for a brief history of quantum gravity | Presented at the 9th Marcel Grossmann Meeting in Roma, July 2000. New
revision, on the basis of numerous new inputs. Many thanks to everybody who
wrote | null | null | null | gr-qc hep-th | null | I sketch the main lines of development of the research in quantum gravity,
from the first explorations in the early thirties to nowadays.
| [
{
"created": "Fri, 16 Jun 2000 15:49:09 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jul 2000 15:31:25 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Jan 2001 18:24:04 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Rovelli",
"Carlo",
""
]
] | I sketch the main lines of development of the research in quantum gravity, from the first explorations in the early thirties to nowadays. |
1803.00850 | Willians Barreto | W. Barreto, P. C. M. Clemente, H. P. de Oliveira and B.
Rodriguez-Mueller | Galerkin-Collocation domain decomposition method for arbitrary binary
black holes | 9 pages; 6 figures. Updated version to appear in Phys. Rev. D | Phys. Rev. D 97, 104035 (2018) | 10.1103/PhysRevD.97.104035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new computational framework for the Galerkin-collocation method
for double domain in the context of ADM 3+1 approach in numerical relativity.
This work enables us to perform high resolution calculations for initial sets
of two arbitrary black holes. We use the Bowen-York method for binary systems
and the... | [
{
"created": "Fri, 2 Mar 2018 13:58:49 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2018 15:11:37 GMT",
"version": "v2"
}
] | 2018-05-24 | [
[
"Barreto",
"W.",
""
],
[
"Clemente",
"P. C. M.",
""
],
[
"de Oliveira",
"H. P.",
""
],
[
"Rodriguez-Mueller",
"B.",
""
]
] | We present a new computational framework for the Galerkin-collocation method for double domain in the context of ADM 3+1 approach in numerical relativity. This work enables us to perform high resolution calculations for initial sets of two arbitrary black holes. We use the Bowen-York method for binary systems and the p... |
2007.12548 | Ra\"ul Vera | Marc Mars, Borja Reina, Ra\"ul Vera | Gauge fixing and regularity of axially symmetric and axistationary
second order perturbations around spherical backgrounds | 60 pages, no figures | null | 10.4310/ATMP.2022.v26.n6.a8 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Perturbation theory in geometric theories of gravitation is a gauge theory of
symmetric tensors defined on a Lorentzian manifold (the background spacetime).
The gauge freedom makes uniqueness problems in perturbation theory particularly
hard as one needs to understand in depth the process of gauge fixing before
attem... | [
{
"created": "Fri, 24 Jul 2020 14:57:08 GMT",
"version": "v1"
}
] | 2024-01-26 | [
[
"Mars",
"Marc",
""
],
[
"Reina",
"Borja",
""
],
[
"Vera",
"Raül",
""
]
] | Perturbation theory in geometric theories of gravitation is a gauge theory of symmetric tensors defined on a Lorentzian manifold (the background spacetime). The gauge freedom makes uniqueness problems in perturbation theory particularly hard as one needs to understand in depth the process of gauge fixing before attempt... |
0902.0560 | Friedrich W. Hehl | Friedrich W. Hehl (U of Cologne and U of Missouri-Columbia) and Bahram
Mashhoon (U of Missouri-Columbia) | A formal framework for a nonlocal generalization of Einstein's theory of
gravitation | 13 pages RevTex, no figures; v2: minor corrections, reference added,
matches published version | Phys.Rev.D79:064028,2009 | 10.1103/PhysRevD.79.064028 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analogy between electrodynamics and the translational gauge theory of
gravity is employed in this paper to develop an ansatz for a nonlocal
generalization of Einstein's theory of gravitation. Working in the linear
approximation, we show that the resulting nonlocal theory is equivalent to
general relativity with "... | [
{
"created": "Tue, 3 Feb 2009 17:24:53 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2009 18:56:48 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Hehl",
"Friedrich W.",
"",
"U of Cologne and U of Missouri-Columbia"
],
[
"Mashhoon",
"Bahram",
"",
"U of Missouri-Columbia"
]
] | The analogy between electrodynamics and the translational gauge theory of gravity is employed in this paper to develop an ansatz for a nonlocal generalization of Einstein's theory of gravitation. Working in the linear approximation, we show that the resulting nonlocal theory is equivalent to general relativity with "da... |
2105.08079 | Leonhard Kehrberger | Leonhard M. A. Kehrberger | The Case Against Smooth Null Infinity I: Heuristics and Counter-Examples | v3: (100 pages, 11 figures) Comment added on Christodoulou's argument
(footnote 6), improved exposition, (the same) sign mistake in eqns. (4.45),
(6.5), (6.18), and (B.2) fixed | Ann. Henri Poincar\'e, 2021 | 10.1007/s00023-021-01108-2 | null | gr-qc hep-th math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper initiates a series of works dedicated to the rigorous study of the
precise structure of gravitational radiation near infinity. We begin with a
brief review of an argument due to Christodoulou [1] stating that Penrose's
proposal of smooth conformal compactification of spacetime (or smooth null
infinity) fai... | [
{
"created": "Mon, 17 May 2021 18:00:08 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jul 2021 15:49:13 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Sep 2023 09:30:34 GMT",
"version": "v3"
}
] | 2023-10-02 | [
[
"Kehrberger",
"Leonhard M. A.",
""
]
] | This paper initiates a series of works dedicated to the rigorous study of the precise structure of gravitational radiation near infinity. We begin with a brief review of an argument due to Christodoulou [1] stating that Penrose's proposal of smooth conformal compactification of spacetime (or smooth null infinity) fails... |
2203.15785 | Mohamed Assaad Abdel-Raouf | Poula Tadros and Mohamed Assaad Abdel-Raouf | Eliminating black holes singularity in Brane world Cosmology | 6 pages | Journal of High Energy Physics, Gravitation and Cosmology, 2022,
8, 259-264 | 10.4236/jhepgc.2022.820202022.82020 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In recent works, a construction was proposed resulting emergent universes
inside black holes. This result can be obtained from a 4D black hole embedded
in a 5D space time with the fifth dimension compactified on a circle [0, 2] (0
and 2 are identified) such that the two branes are at 0 and 1. In the present
work, we ... | [
{
"created": "Mon, 21 Mar 2022 19:33:58 GMT",
"version": "v1"
}
] | 2022-03-30 | [
[
"Tadros",
"Poula",
""
],
[
"Abdel-Raouf",
"Mohamed Assaad",
""
]
] | In recent works, a construction was proposed resulting emergent universes inside black holes. This result can be obtained from a 4D black hole embedded in a 5D space time with the fifth dimension compactified on a circle [0, 2] (0 and 2 are identified) such that the two branes are at 0 and 1. In the present work, we st... |
1602.01439 | Charles Quarra Charles Quarra | Charles J. Quarra | Creating spacetime shortcuts with gravitational waveforms | 6 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A region-delimited gravitational wave field can be constructed, such that a
subset of geodesics crossing this region will move faster than nearby geodesics
moving entirely inside flat spacetime, along a preferred direction. Null
geodesics inside this region will move faster-than-light according to far away
observers.... | [
{
"created": "Tue, 2 Feb 2016 07:09:53 GMT",
"version": "v1"
}
] | 2016-02-04 | [
[
"Quarra",
"Charles J.",
""
]
] | A region-delimited gravitational wave field can be constructed, such that a subset of geodesics crossing this region will move faster than nearby geodesics moving entirely inside flat spacetime, along a preferred direction. Null geodesics inside this region will move faster-than-light according to far away observers. T... |
1801.09769 | Felix Willenborg | Felix Willenborg, Saskia Grunau, Burkhard Kleihaus, Jutta Kunz | Geodesic motion around traversable wormholes supported by a massless
conformally-coupled scalar field | 18 pages, 23 figures | Phys. Rev. D 97, 124002 (2018) | 10.1103/PhysRevD.97.124002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a traversable wormhole solution of Einstein's gravity conformally
coupled to a massless scalar field, a solution derived by Barcelo and Visser
based on the JNWW spacetime. We study the geodesic motion of time-, light- and
space-like particles in this spacetime. We solve the equations of motion
analyticall... | [
{
"created": "Mon, 29 Jan 2018 21:30:11 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Jun 2018 13:05:42 GMT",
"version": "v2"
}
] | 2018-06-19 | [
[
"Willenborg",
"Felix",
""
],
[
"Grunau",
"Saskia",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | We consider a traversable wormhole solution of Einstein's gravity conformally coupled to a massless scalar field, a solution derived by Barcelo and Visser based on the JNWW spacetime. We study the geodesic motion of time-, light- and space-like particles in this spacetime. We solve the equations of motion analytically ... |
2107.10579 | Cong Zhang | Cong Zhang, Yongge Ma, Shupeng Song and Xiangdong Zhang | Loop quantum deparametrized Schwarzschild interior and discrete black
hole mass | 19+12 pages, 2 figures, derivations on the regularized Hamiltonian is
added and the classical dynamics is plotted in Fig. 1 | null | 10.1103/PhysRevD.105.024069 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We present the detailed analyses of a model of loop quantum Schwarzschild
interior coupled to a massless scalar field and extend the results in our
previous rapid communication arXiv:2006.08313 to more general schemes. It is
shown that the spectrum of the black hole mass is discrete and does not contain
zero. This in... | [
{
"created": "Thu, 22 Jul 2021 11:18:59 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jul 2021 07:56:52 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Sep 2021 10:36:48 GMT",
"version": "v3"
}
] | 2022-02-09 | [
[
"Zhang",
"Cong",
""
],
[
"Ma",
"Yongge",
""
],
[
"Song",
"Shupeng",
""
],
[
"Zhang",
"Xiangdong",
""
]
] | We present the detailed analyses of a model of loop quantum Schwarzschild interior coupled to a massless scalar field and extend the results in our previous rapid communication arXiv:2006.08313 to more general schemes. It is shown that the spectrum of the black hole mass is discrete and does not contain zero. This indi... |
1904.09735 | Georgia Kittou | Georgia Kittou | Interacting vacuum at infinity | 14 pages | IJGMMP, Vol. No.16, Issue No. 04. IJGMMP, Volume No.16, Issue No.
04, Feb. 2019 | 10.1142/S021988781950052X | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the central extension technique of Poincare to dynamics involving an
interacting mixture of pressureless matter and vacuum near a finite-time
singularity. We show that the only attractor solution on the circle of infinity
is the one describing a vanishing matter-vacuum model at early times
| [
{
"created": "Mon, 22 Apr 2019 06:01:38 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2019 06:03:31 GMT",
"version": "v2"
}
] | 2019-04-25 | [
[
"Kittou",
"Georgia",
""
]
] | We apply the central extension technique of Poincare to dynamics involving an interacting mixture of pressureless matter and vacuum near a finite-time singularity. We show that the only attractor solution on the circle of infinity is the one describing a vanishing matter-vacuum model at early times |
gr-qc/0609114 | Vladimir Ivashchuk | I.S. Goncharenko, V.D. Ivashchuk, S. Rudametkin-Aguilar and D.
Singleton | Electric S-brane solutions with a parallel charge density form on a
Ricci-flat factor space | 4 pages, Latex, Proceedings of the International Conference on
Gravitation, Cosmology, Astrophysics and Nonstationary Gas Dynamics,
Dedicated to Prof. K.P. Staniukovich's 90th birthday, Moscow, 2-6 March 2006 | Grav.Cosmol.12:169-172,2006 | null | IGC-PFUR-02-09/06 | gr-qc astro-ph hep-th | null | We generalize the previously studied cosmological solutions in D-dimensional
gravity with an antisymmetric (p+2)-form to the case when the spatial part of
the metric is Ricci-flat rather than flat. These generalized solutions are
characterized by a parallel self-dual or anti-self-dual charge density form Q
of rank 2m... | [
{
"created": "Mon, 25 Sep 2006 19:29:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Goncharenko",
"I. S.",
""
],
[
"Ivashchuk",
"V. D.",
""
],
[
"Rudametkin-Aguilar",
"S.",
""
],
[
"Singleton",
"D.",
""
]
] | We generalize the previously studied cosmological solutions in D-dimensional gravity with an antisymmetric (p+2)-form to the case when the spatial part of the metric is Ricci-flat rather than flat. These generalized solutions are characterized by a parallel self-dual or anti-self-dual charge density form Q of rank 2m a... |
0812.0577 | Alejandro Perez | Clisthenis P. Constantinidis, Alejandro Perez, Olivier Piguet | Quantization of the Jackiw-Teitelboim model | Published version, a short note (not present in the published
version) on the quantization of the null sector has been added | Phys.Rev.D79:084007,2009 | 10.1103/PhysRevD.79.084007 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phase space structure of the Jackiw-Teitelboim model in its
connection variables formulation where the gauge group of the field theory is
given by local SL(2,R) (or SU(2) for the Euclidean model), i.e. the de Sitter
group in two dimensions. In order to make the connection with two dimensional
gravity exp... | [
{
"created": "Tue, 2 Dec 2008 19:48:25 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2009 16:35:38 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jul 2009 13:08:11 GMT",
"version": "v3"
}
] | 2009-07-24 | [
[
"Constantinidis",
"Clisthenis P.",
""
],
[
"Perez",
"Alejandro",
""
],
[
"Piguet",
"Olivier",
""
]
] | We study the phase space structure of the Jackiw-Teitelboim model in its connection variables formulation where the gauge group of the field theory is given by local SL(2,R) (or SU(2) for the Euclidean model), i.e. the de Sitter group in two dimensions. In order to make the connection with two dimensional gravity expli... |
2012.02582 | Iffat Fayyaz | M. Farasat Shamir, I. Fayyaz | Traversable Wormhole Solutions in $f(R)$ Gravity Via Karmarkar Condition | 11 pages, 7 figures | Eur. Phys. J. C80 (2020) 1102 | 10.1140/epjc/s10052-020-08689-y | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Motivated by recent proposals of possible wormhole shape functions, we
construct a wormhole shape function by employing the Karmarkar condition for
static traversable wormhole geometry. The proposed shape function generates
wormhole geometry that connects two asymptotically flat regions of spacetime
and satisfies the... | [
{
"created": "Wed, 2 Dec 2020 10:11:10 GMT",
"version": "v1"
}
] | 2020-12-07 | [
[
"Shamir",
"M. Farasat",
""
],
[
"Fayyaz",
"I.",
""
]
] | Motivated by recent proposals of possible wormhole shape functions, we construct a wormhole shape function by employing the Karmarkar condition for static traversable wormhole geometry. The proposed shape function generates wormhole geometry that connects two asymptotically flat regions of spacetime and satisfies the r... |
2209.01798 | Vishnulal C | Vishnulal C, Saurya Das, and Soumen Basak | Quasinormal modes of anyons | 7 pages. Minor typos corrected. Published in General Relativity and
Gravitation | Volume: 56, Article no: 33, Year: 2024, General Relativity and
Gravitation | 10.1007/s10714-024-03217-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the quasinormal modes of anyons from (2+1)-dimensional Banados,
Teitelboim, and Zanelli(BTZ) and analogue black holes, and discuss potential
experiments to measure these quasinormal modes.
| [
{
"created": "Mon, 5 Sep 2022 07:16:54 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2024 09:10:56 GMT",
"version": "v2"
}
] | 2024-02-28 | [
[
"C",
"Vishnulal",
""
],
[
"Das",
"Saurya",
""
],
[
"Basak",
"Soumen",
""
]
] | We derive the quasinormal modes of anyons from (2+1)-dimensional Banados, Teitelboim, and Zanelli(BTZ) and analogue black holes, and discuss potential experiments to measure these quasinormal modes. |
2001.02515 | Ikjyot Singh Kohli | Ikjyot Singh Kohli | Einstein's Field Equations as Continuous-Time Recurrent Neural Networks | Fixed some typos in figure captions in this version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine a subset of spatially homogenous and anisotropic solutions to
Einstein's field equations: the Bianchi Type A models, and show that they can
be written as a continuous-time recurrent neural network (CTRNN). This
reformulation of Einstein's equations allows one to write potentially
complicated nonlinear equa... | [
{
"created": "Wed, 8 Jan 2020 17:05:07 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 2020 04:40:41 GMT",
"version": "v2"
}
] | 2020-01-10 | [
[
"Kohli",
"Ikjyot Singh",
""
]
] | We examine a subset of spatially homogenous and anisotropic solutions to Einstein's field equations: the Bianchi Type A models, and show that they can be written as a continuous-time recurrent neural network (CTRNN). This reformulation of Einstein's equations allows one to write potentially complicated nonlinear equati... |
1706.08830 | Anna Paula Bacalhau | Anna Paula Bacalhau, Nelson Pinto-Neto and Sandro Dias Pinto Vitenti | Consistent Scalar and Tensor Perturbation Power Spectra in Single Fluid
Matter Bounce with Dark Energy Era | 23 pages, 15 figures | Phys. Rev. D 97, 083517 (2018) | 10.1103/PhysRevD.97.083517 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cosmological scenarios containing one canonical scalar field
with an exponential potential in the context of bouncing models, where the
bounce happens due to quantum cosmological effects. The only possible bouncing
solutions in this scenario (discarding an infinitely fine tuned exception) must
have one... | [
{
"created": "Tue, 27 Jun 2017 13:13:25 GMT",
"version": "v1"
}
] | 2018-05-01 | [
[
"Bacalhau",
"Anna Paula",
""
],
[
"Pinto-Neto",
"Nelson",
""
],
[
"Vitenti",
"Sandro Dias Pinto",
""
]
] | We investigate cosmological scenarios containing one canonical scalar field with an exponential potential in the context of bouncing models, where the bounce happens due to quantum cosmological effects. The only possible bouncing solutions in this scenario (discarding an infinitely fine tuned exception) must have one a... |
2203.03203 | Tao Zhu | Jian-Ming Yan, Qiang Wu, Cheng Liu, Tao Zhu, and Anzhong Wang | Constraints on self-dual black hole in loop quantum gravity with S0-2
star in the Galactic Center | 10 pages, 5 figures, 2 tables; v2: 12 pages, 7 figures, 2 tables, to
appear in JCAP | null | 10.1088/1475-7516/2022/09/008 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | One of remarkable features of loop quantum gravity (LQG) is that it can
provide resolutions to both the black hole and big bang singularities. In the
mini-superspace approach based on the polymerization procedure in LQG, a
quantum corrected black hole metric is constructed. This metric is also known
as self-dual spac... | [
{
"created": "Mon, 7 Mar 2022 08:28:42 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2022 01:32:37 GMT",
"version": "v2"
}
] | 2022-09-14 | [
[
"Yan",
"Jian-Ming",
""
],
[
"Wu",
"Qiang",
""
],
[
"Liu",
"Cheng",
""
],
[
"Zhu",
"Tao",
""
],
[
"Wang",
"Anzhong",
""
]
] | One of remarkable features of loop quantum gravity (LQG) is that it can provide resolutions to both the black hole and big bang singularities. In the mini-superspace approach based on the polymerization procedure in LQG, a quantum corrected black hole metric is constructed. This metric is also known as self-dual spacet... |
gr-qc/0611140 | Muhammad Sharif | M. Sharif and Tariq Ismaeel | Proper Matter Collineations of Plane Symmetric Spacetimes | 10 pages, LaTex, accepted for publication in Modern Physics Letters A | Mod.Phys.Lett.A22:1813-1819,2007 | 10.1142/S0217732307021809 | null | gr-qc | null | We investigate matter collineations of plane symmetric spacetimes when the
energy-momentum tensor is degenerate. There exists three interesting cases
where the group of matter collineations is finite-dimensional. The matter
collineations in these cases are either four, six or ten in which four are
isometries and the ... | [
{
"created": "Mon, 27 Nov 2006 08:41:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sharif",
"M.",
""
],
[
"Ismaeel",
"Tariq",
""
]
] | We investigate matter collineations of plane symmetric spacetimes when the energy-momentum tensor is degenerate. There exists three interesting cases where the group of matter collineations is finite-dimensional. The matter collineations in these cases are either four, six or ten in which four are isometries and the re... |
1502.00386 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu | Insight into the Microscopic Structure of an AdS Black Hole from
Thermodynamical Phase Transition | 5 pages, 4 figures, accepted for publication in Phys. Rev. Lett | Phys. Rev. Lett. 115, 111302 (2015) | 10.1103/PhysRevLett.115.111302 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Comparing with an ordinary thermodynamic system, we investigate the possible
microscopic structure of a charged anti-de Sitter black hole completely from
the thermodynamic viewpoint. The number density of the black hole molecules is
introduced to measure the microscopic degrees of freedom of the black hole. We
found ... | [
{
"created": "Mon, 2 Feb 2015 07:41:26 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Aug 2015 12:45:50 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Sep 2015 07:23:41 GMT",
"version": "v3"
}
] | 2015-09-18 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Comparing with an ordinary thermodynamic system, we investigate the possible microscopic structure of a charged anti-de Sitter black hole completely from the thermodynamic viewpoint. The number density of the black hole molecules is introduced to measure the microscopic degrees of freedom of the black hole. We found th... |
1905.07620 | Camilo Santa | Camilo Santa, Antonio Enea Romano | Constraining gravity theories with the gravitational stability mass | 5 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The measurement of the size of gravitationally bounded structures is an
important test of gravity theories. For a given radius different theories can
in fact predict a different gravitational stability mass (GSM) necessary to
ensure the stability of the structure in presence of dark energy. We compute
the GSM of grav... | [
{
"created": "Sat, 18 May 2019 18:10:24 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2019 20:50:01 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jun 2020 23:44:20 GMT",
"version": "v3"
}
] | 2020-06-18 | [
[
"Santa",
"Camilo",
""
],
[
"Romano",
"Antonio Enea",
""
]
] | The measurement of the size of gravitationally bounded structures is an important test of gravity theories. For a given radius different theories can in fact predict a different gravitational stability mass (GSM) necessary to ensure the stability of the structure in presence of dark energy. We compute the GSM of gravit... |
gr-qc/0101117 | Amos Ori | Ehud B. Segalis and Amos Ori | Emission of gravitational radiation from ultra-relativistic sources | 24 pages, LaTeX | Phys.Rev. D64 (2001) 064018 | 10.1103/PhysRevD.64.064018 | null | gr-qc astro-ph | null | Recent observations suggest that blobs of matter are ejected with
ultra-relativistic speeds in various astrophysical phenomena such as supernova
explosions, quasars, and microquasars. In this paper we analyze the
gravitational radiation emitted when such an ultra-relativistic blob is ejected
from a massive object. We... | [
{
"created": "Tue, 30 Jan 2001 12:17:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Segalis",
"Ehud B.",
""
],
[
"Ori",
"Amos",
""
]
] | Recent observations suggest that blobs of matter are ejected with ultra-relativistic speeds in various astrophysical phenomena such as supernova explosions, quasars, and microquasars. In this paper we analyze the gravitational radiation emitted when such an ultra-relativistic blob is ejected from a massive object. We e... |
2212.02670 | Dimiter Hadjimichef | Benno Bodmann, C\'esar A. Zen Vasconcellos, Jos\'e de Freitas Pacheco,
Peter O. Hess, Dimiter Hadjimichef | Causality and the Arrow of Time in the Branch-Cut Cosmology | null | null | 10.1002/asna.20220086 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We basis our initial analysis of the arrow of time on a relationship between
the time evolution operator of quantum system and the time-independent density
operator which describes the equilibrium state of a many-particle system at
temperature $T$. We highlight through this analysis the identification of the
imaginar... | [
{
"created": "Tue, 6 Dec 2022 00:07:30 GMT",
"version": "v1"
}
] | 2023-04-05 | [
[
"Bodmann",
"Benno",
""
],
[
"Vasconcellos",
"César A. Zen",
""
],
[
"Pacheco",
"José de Freitas",
""
],
[
"Hess",
"Peter O.",
""
],
[
"Hadjimichef",
"Dimiter",
""
]
] | We basis our initial analysis of the arrow of time on a relationship between the time evolution operator of quantum system and the time-independent density operator which describes the equilibrium state of a many-particle system at temperature $T$. We highlight through this analysis the identification of the imaginary ... |
1404.6403 | Philippe G. LeFloch | Robert Beig and Philippe G. LeFloch | Generalized relativistic hydrodynamics with a convex extension | 7 pages | null | 10.1088/0264-9381/31/12/125005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new model which describes relativistic hydrodynamics and
generalizes the standard Euler system of isentropic perfect fluids. Remarkably,
our system admits a convex extension which allows us to transform it to a
symmetric hyperbolic form. This result sheds new light even on the relativistic
Euler system.
| [
{
"created": "Fri, 25 Apr 2014 11:45:37 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Beig",
"Robert",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | We propose a new model which describes relativistic hydrodynamics and generalizes the standard Euler system of isentropic perfect fluids. Remarkably, our system admits a convex extension which allows us to transform it to a symmetric hyperbolic form. This result sheds new light even on the relativistic Euler system. |
2209.04403 | Giulia Maniccia | Giulia Maniccia, Mariaveronica De Angelis, Giovanni Montani | WKB Approaches to Restore Time in Quantum Cosmology: Predictions and
Shortcomings | References added and discussion expanded. Matches the published
version | Universe 2022, 8(11), 556 | 10.3390/universe8110556 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this review, we analyse different aspects concerning the possibility to
separate a gravity-matter system into a part which lives close to a
quasi-classical state and a "small" quantum subset. The considered approaches
are all relying on a WKB expansion of the dynamics by an order parameter and
the natural arena co... | [
{
"created": "Fri, 9 Sep 2022 17:11:21 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Oct 2022 18:21:15 GMT",
"version": "v2"
}
] | 2022-10-27 | [
[
"Maniccia",
"Giulia",
""
],
[
"De Angelis",
"Mariaveronica",
""
],
[
"Montani",
"Giovanni",
""
]
] | In this review, we analyse different aspects concerning the possibility to separate a gravity-matter system into a part which lives close to a quasi-classical state and a "small" quantum subset. The considered approaches are all relying on a WKB expansion of the dynamics by an order parameter and the natural arena cons... |
gr-qc/9811035 | Filipe Mena | Filipe C. Mena, Reza Tavakol (QMW, London) | Evolution of the density contrast in inhomogeneous dust models | 22 pages, 1 figure. To be published in Classical and Quantum Gravity | Class.Quant.Grav.16:435-452,1999 | 10.1088/0264-9381/16/2/009 | null | gr-qc | null | With the help of families of density contrast indicators, we study the
tendency of gravitational systems to become increasingly lumpy with time.
Depending upon their domain of definition, these indicators could be local or
global. We make a comparative study of these indicators in the context of
inhomogeneous cosmolo... | [
{
"created": "Wed, 11 Nov 1998 18:06:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mena",
"Filipe C.",
"",
"QMW, London"
],
[
"Tavakol",
"Reza",
"",
"QMW, London"
]
] | With the help of families of density contrast indicators, we study the tendency of gravitational systems to become increasingly lumpy with time. Depending upon their domain of definition, these indicators could be local or global. We make a comparative study of these indicators in the context of inhomogeneous cosmologi... |
2204.07180 | Maryam Roushan | Maryam Roushan, Narges Rashidi and Kourosh Nozari | Visible Energy Alternative to Dark Energy | 10 pages; 3 figures; Accepted for publication in Chinese Journal of
Physics | null | 10.1016/j.cjph.2022.03.025 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum gravitational effects usually are assumed to be important on small
scale (Planck scale), but actually these effects are also very significant on
large (cosmological) scales. It is recognized that in curved spacetime, the
existence of a minimal measurable momentum is inevitable. In this paper, we
study thermod... | [
{
"created": "Thu, 14 Apr 2022 18:24:49 GMT",
"version": "v1"
}
] | 2022-04-18 | [
[
"Roushan",
"Maryam",
""
],
[
"Rashidi",
"Narges",
""
],
[
"Nozari",
"Kourosh",
""
]
] | Quantum gravitational effects usually are assumed to be important on small scale (Planck scale), but actually these effects are also very significant on large (cosmological) scales. It is recognized that in curved spacetime, the existence of a minimal measurable momentum is inevitable. In this paper, we study thermodyn... |
1307.4687 | Jedrzej Swiezewski | Jedrzej \'Swie\.zewski | On the properties of the irrotational dust model | 3 pages; accepted for publication in CQG | Class. Quantum Grav. 30 (2013) 237001 | 10.1088/0264-9381/30/23/237001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we analyze the model of the irrotational dust used recently to
deparametrize gravitational action. We prove that the remarkable fact that the
Hamiltonian is not a square root is a direct consequence of the time-gauge
choice in this model. No additional assumptions or sign choices are necessary
to obtain ... | [
{
"created": "Wed, 17 Jul 2013 16:28:29 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Sep 2013 10:46:48 GMT",
"version": "v2"
}
] | 2013-10-10 | [
[
"Świeżewski",
"Jedrzej",
""
]
] | In this note we analyze the model of the irrotational dust used recently to deparametrize gravitational action. We prove that the remarkable fact that the Hamiltonian is not a square root is a direct consequence of the time-gauge choice in this model. No additional assumptions or sign choices are necessary to obtain th... |
2208.09044 | Ernesto Contreras | P. Bargue\~no, E. Fuenmayor, E. Contreras | Complexity factor for black holes in the framework of the Newman-Penrose
formalism | null | Annals. Phys. 443, 169012 (2022) | 10.1016/j.aop.2022.169012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we introduce the {\it complexity factor} in the context of
self--gravitating fluid distributions for the case of black holes by employing
the Newman-Penrose formalism. In particular, by working with spherically
symmetric and static AdS black holes, we show that the complexity factor can be
interpreted i... | [
{
"created": "Thu, 18 Aug 2022 20:03:11 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Bargueño",
"P.",
""
],
[
"Fuenmayor",
"E.",
""
],
[
"Contreras",
"E.",
""
]
] | In this work, we introduce the {\it complexity factor} in the context of self--gravitating fluid distributions for the case of black holes by employing the Newman-Penrose formalism. In particular, by working with spherically symmetric and static AdS black holes, we show that the complexity factor can be interpreted in ... |
1102.3660 | Carlo Rovelli | Carlo Rovelli | Zakopane lectures on loop gravity | This is a largely restructured and expanded version of the lectures.
In particular, I have added a substantial introductory and orientation
Section, a discussion on the justification for the vertex expansion, and more
details on the applications. Comments and corrections always very welcome. 34
pages. Many figu... | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These are introductory lectures on loop quantum gravity. The theory is
presented in self-contained form, without emphasis on its derivation from
classical general relativity. Dynamics is given in the covariant form. Some
applications are described.
| [
{
"created": "Thu, 17 Feb 2011 19:00:54 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Feb 2011 22:02:28 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Feb 2011 20:58:47 GMT",
"version": "v3"
},
{
"created": "Sat, 23 Jul 2011 16:47:30 GMT",
"version": "v4"
},
{
"c... | 2011-08-04 | [
[
"Rovelli",
"Carlo",
""
]
] | These are introductory lectures on loop quantum gravity. The theory is presented in self-contained form, without emphasis on its derivation from classical general relativity. Dynamics is given in the covariant form. Some applications are described. |
0809.1183 | David Wiltshire | David L. Wiltshire | Cosmological equivalence principle and the weak-field limit | 17 pages, 5 figures; v2 references added; v3 typos fixed, matches
published version in Phys. Rev. D | Phys.Rev.D78:084032,2008 | 10.1103/PhysRevD.78.084032 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong equivalence principle is extended in application to averaged
dynamical fields in cosmology to include the role of the average density in the
determination of inertial frames. The resulting cosmological equivalence
principle is applied to the problem of synchronisation of clocks in the
observed universe. On... | [
{
"created": "Mon, 8 Sep 2008 13:40:58 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2008 10:37:38 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Oct 2008 17:37:05 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Wiltshire",
"David L.",
""
]
] | The strong equivalence principle is extended in application to averaged dynamical fields in cosmology to include the role of the average density in the determination of inertial frames. The resulting cosmological equivalence principle is applied to the problem of synchronisation of clocks in the observed universe. Once... |
gr-qc/9811005 | Sascha Husa | Sascha Husa | Asymptotically Flat Initial Data for Gravitational Wave Spacetimes,
Conformal Compactification and Conformal Symmetry | Contribution to the 8th Conference on Theoretical Physics, General
Relativity and Gravitation in Bistrita-Nasaud, Romania; LaTeX, 13 pages | null | null | null | gr-qc | null | We study the utilization of conformal compactification within the conformal
approach to solving the constraints of general relativity for asymptotically
flat initial data. After a general discussion of the framework, particular
attention is paid to simplifications that arise when restricting to a class of
initial dat... | [
{
"created": "Mon, 2 Nov 1998 23:33:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Husa",
"Sascha",
""
]
] | We study the utilization of conformal compactification within the conformal approach to solving the constraints of general relativity for asymptotically flat initial data. After a general discussion of the framework, particular attention is paid to simplifications that arise when restricting to a class of initial data ... |
gr-qc/0501060 | Nikolaos Mavromatos | John Ellis, Nikolaos E. Mavromatos and Michael Westmuckett | Potentials between D-Branes in a Supersymmetric Model of Space-Time Foam | 26 pages Latex, four eps figures incorporated, minor typos corrected,
no effects on conclusions | Phys.Rev.D71:106006,2005 | 10.1103/PhysRevD.71.106006 | CERN-PH-TH/2004-243 | gr-qc hep-ph hep-th | null | We study a supersymmetric model of space-time foam with two stacks each of
eight D8-branes with equal string tensions, separated by a single bulk
dimension containing D0-brane particles that represent quantum fluctuations.
The ground-state configuration with static D-branes has zero vacuum energy,
but, when they move... | [
{
"created": "Wed, 19 Jan 2005 20:16:29 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2005 13:58:55 GMT",
"version": "v2"
}
] | 2009-09-11 | [
[
"Ellis",
"John",
""
],
[
"Mavromatos",
"Nikolaos E.",
""
],
[
"Westmuckett",
"Michael",
""
]
] | We study a supersymmetric model of space-time foam with two stacks each of eight D8-branes with equal string tensions, separated by a single bulk dimension containing D0-brane particles that represent quantum fluctuations. The ground-state configuration with static D-branes has zero vacuum energy, but, when they move, ... |
gr-qc/0412079 | Etera R. Livine | Florian Girelli, Etera R. Livine | Physics of Deformed Special Relativity | 8 pages, short version of gr-qc/0412004, Proceedings of the Second
International Workshop DICE2004 (Castello di Piombino, Tuscany) "From
Decoherence and Emergent Classicality to Emergent Quantum Mechanics" | Braz.J.Phys. 35 (2005) 432-438 | 10.1590/S0103-97332005000300011 | null | gr-qc hep-th | null | In many different ways, Deformed Special Relativity (DSR) has been argued to
provide an effective limit of quantum gravity in almost-flat regime.
Unfortunately DSR is up to now plagued by many conceptual problems (in
particular how it describes macroscopic objects) which forbids a definitive
physical interpretation a... | [
{
"created": "Thu, 16 Dec 2004 13:56:42 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Girelli",
"Florian",
""
],
[
"Livine",
"Etera R.",
""
]
] | In many different ways, Deformed Special Relativity (DSR) has been argued to provide an effective limit of quantum gravity in almost-flat regime. Unfortunately DSR is up to now plagued by many conceptual problems (in particular how it describes macroscopic objects) which forbids a definitive physical interpretation and... |
1509.08899 | Brajesh Gupt | Abhay Ashtekar, Brajesh Gupt | Generalized effective description of loop quantum cosmology | 21 pages, 4 figures; A paragraph discussing the relation to the
"Chimera scheme" added in section V. Version to appear in PRD | Phys. Rev. D 92, 084060 (2015) | 10.1103/PhysRevD.92.084060 | IGC-15/9-2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective description of loop quantum cosmology (LQC) has proved to be a
convenient platform to study phenomenological implications of the quantum
bounce that resolves the classical big-bang singularity. Originally, this
description was derived using Gaussian quantum states with small dispersions.
In this paper w... | [
{
"created": "Tue, 29 Sep 2015 19:31:02 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2015 15:03:40 GMT",
"version": "v2"
}
] | 2015-11-04 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Gupt",
"Brajesh",
""
]
] | The effective description of loop quantum cosmology (LQC) has proved to be a convenient platform to study phenomenological implications of the quantum bounce that resolves the classical big-bang singularity. Originally, this description was derived using Gaussian quantum states with small dispersions. In this paper we ... |
1204.2241 | Juan Antonio Morales Lladosa | Bartolom\'e Coll, Joan Josep Ferrando and Juan Antonio Morales-Lladosa | Positioning systems in Minkowski space-time: Bifurcation problem and
observational data | 10 pages, 7 figures. The version published in PRD contains a misprint
in the caption of Figure 3, which is here amended | Physical Review D 86, 084036 (2012) | 10.1103/PhysRevD.86.084036 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of relativistic positioning systems in Minkowski space-time,
the determination of the inertial coordinates of a user involves the {\em
bifurcation problem} (which is the indeterminate location of a pair of
different events receiving the same emission coordinates). To solve it, in
addition to the user... | [
{
"created": "Tue, 10 Apr 2012 18:41:25 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Feb 2013 12:59:40 GMT",
"version": "v2"
}
] | 2015-03-20 | [
[
"Coll",
"Bartolomé",
""
],
[
"Ferrando",
"Joan Josep",
""
],
[
"Morales-Lladosa",
"Juan Antonio",
""
]
] | In the framework of relativistic positioning systems in Minkowski space-time, the determination of the inertial coordinates of a user involves the {\em bifurcation problem} (which is the indeterminate location of a pair of different events receiving the same emission coordinates). To solve it, in addition to the user e... |
2106.12466 | Srashti Goyal | Srashti Goyal, Harikrishnan D., Shasvath J. Kapadia and Parameswaran
Ajith | Rapid Identification of Strongly Lensed Gravitational-Wave Events with
Machine Learning | 11 pages, 6 figures | null | 10.1103/PhysRevD.104.124057 | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | A small fraction of the gravitational-wave (GW) signals that will be detected
by second and third generation detectors are expected to be strongly lensed by
galaxies and clusters, producing multiple observable copies. While optimal
Bayesian model selection methods are developed to identify lensed signals,
processing ... | [
{
"created": "Wed, 23 Jun 2021 15:27:28 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Goyal",
"Srashti",
""
],
[
"D.",
"Harikrishnan",
""
],
[
"Kapadia",
"Shasvath J.",
""
],
[
"Ajith",
"Parameswaran",
""
]
] | A small fraction of the gravitational-wave (GW) signals that will be detected by second and third generation detectors are expected to be strongly lensed by galaxies and clusters, producing multiple observable copies. While optimal Bayesian model selection methods are developed to identify lensed signals, processing te... |
2209.08581 | Khalil El Bourakadi | K. El Bourakadi, M. Ferricha-Alami, H. Filali, Z. Sakhi and M. Bennai | Gravitational Waves from Preheating in Gauss-Bonnet Inflation | null | The European Physical Journal C volume 81, Article number: 1144
(2021) | 10.1140/epjc/s10052-021-09946-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational wave production in an expanding Universe during the
first stages following inflation, and investigate the consequences of the
Gauss-Bonnet term on the inflationary parameters for a power-law inflation
model with a GB coupling term. Moreover, we perform the analyses on the
preheating parameters ... | [
{
"created": "Sun, 18 Sep 2022 15:14:07 GMT",
"version": "v1"
}
] | 2022-09-20 | [
[
"Bourakadi",
"K. El",
""
],
[
"Ferricha-Alami",
"M.",
""
],
[
"Filali",
"H.",
""
],
[
"Sakhi",
"Z.",
""
],
[
"Bennai",
"M.",
""
]
] | We study gravitational wave production in an expanding Universe during the first stages following inflation, and investigate the consequences of the Gauss-Bonnet term on the inflationary parameters for a power-law inflation model with a GB coupling term. Moreover, we perform the analyses on the preheating parameters in... |
gr-qc/0612011 | Reinhard Meinel | Reinhard Meinel | Quasi-stationary routes to the Kerr black hole | 3 pages, talk given at the Eleventh Marcel Grossmann Meeting (Berlin,
July 23 - 29, 2006), submitted to the Conference Proceedings | null | 10.1142/9789812834300_0372 | null | gr-qc astro-ph hep-th | null | Quasi-stationary (i.e. parametric) transitions from rotating equilibrium
configurations of fluid bodies to rotating black holes are discussed. For the
idealized model of a rotating disc of dust, analytical results derived by means
of the "inverse scattering method" are available. They are generalized by
numerical res... | [
{
"created": "Fri, 1 Dec 2006 12:47:09 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Meinel",
"Reinhard",
""
]
] | Quasi-stationary (i.e. parametric) transitions from rotating equilibrium configurations of fluid bodies to rotating black holes are discussed. For the idealized model of a rotating disc of dust, analytical results derived by means of the "inverse scattering method" are available. They are generalized by numerical resul... |
1606.02590 | Peter K.F. Kuhfittig | Peter K. F. Kuhfittig | A note on the predictability of flat galactic rotation curves | 4 pages, no figures | Fundamental J. Math. Phys., vol. 5, 1-6 (2016) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on an exact solution of the Einstein field equations, it is proposed in
this note that the dark-matter hypothesis could have led to the prediction of
flat galactic rotation curves long before the discovery thereof by assuming
that on large scales the matter in the Universe, including dark matter, is a
perfect f... | [
{
"created": "Wed, 8 Jun 2016 15:02:58 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2016 22:19:21 GMT",
"version": "v2"
}
] | 2016-06-14 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Based on an exact solution of the Einstein field equations, it is proposed in this note that the dark-matter hypothesis could have led to the prediction of flat galactic rotation curves long before the discovery thereof by assuming that on large scales the matter in the Universe, including dark matter, is a perfect flu... |
gr-qc/9909042 | Henrique P. de Oliveira | H. P. de Oliveira, S. L. Sautu, I. Dami\~ao Soares and E. V. Tonini | Chaos and Universality in the Dynamics of Inflationary Cosmologies | 5 pages, 4 figures, submitted to Physical Review D | Phys.Rev.D60:121301,1999 | 10.1103/PhysRevD.60.121301 | null | gr-qc | null | We describe a new statistical pattern in the chaotic dynamics of closed
inflationary cosmologies, associated with the partition of the Hamiltonian
rotational motion energy and hyperbolic motion energy pieces, in a linear
neighborhood of the saddle-center present in the phase space of the models. The
hyperbolic energy... | [
{
"created": "Tue, 14 Sep 1999 14:34:01 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"de Oliveira",
"H. P.",
""
],
[
"Sautu",
"S. L.",
""
],
[
"Soares",
"I. Damião",
""
],
[
"Tonini",
"E. V.",
""
]
] | We describe a new statistical pattern in the chaotic dynamics of closed inflationary cosmologies, associated with the partition of the Hamiltonian rotational motion energy and hyperbolic motion energy pieces, in a linear neighborhood of the saddle-center present in the phase space of the models. The hyperbolic energy o... |
1912.03089 | Andreas Maier | Johannes Bl\"umlein, Andreas Maier, Peter Marquard | The Gravitational Potential of Two Point Masses at Five Loops | 7 pages, no figures. Contribution to 14th International Symposium on
Radiative Corrections (RADCOR2019) | null | null | DESY 19-218, DO-TH 19/05, SAGEX-19-31 | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | Corrections to the Newtonian gravitational potential from general relativity
can be derived in a combined expansion around flat spacetime and a small
velocity of the interacting bodies. We present the calculation of the static
five-loop corrections in an effective field theory framework using techniques
from multi-lo... | [
{
"created": "Fri, 6 Dec 2019 12:46:14 GMT",
"version": "v1"
}
] | 2019-12-09 | [
[
"Blümlein",
"Johannes",
""
],
[
"Maier",
"Andreas",
""
],
[
"Marquard",
"Peter",
""
]
] | Corrections to the Newtonian gravitational potential from general relativity can be derived in a combined expansion around flat spacetime and a small velocity of the interacting bodies. We present the calculation of the static five-loop corrections in an effective field theory framework using techniques from multi-loop... |
2302.11016 | Brian Pardo | Adam K. Leibovich, Brian A. Pardo, Zixin Yang | Radiation Reaction for Non-Spinning Bodies at 4.5PN in the Effective
Field Theory Approach | 23 pages. 1 ancillary file (wl format) | null | 10.1103/PhysRevD.108.024017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the 2 post-Newtonian correction to the radiation reaction
acceleration for non-spinning binary systems, which amounts to the 4.5
post-Newtonian correction to Newtonian acceleration. The calculation is carried
out completely using the effective field theory approach. The center-of-mass
corrections to the ... | [
{
"created": "Tue, 21 Feb 2023 21:28:45 GMT",
"version": "v1"
}
] | 2023-07-19 | [
[
"Leibovich",
"Adam K.",
""
],
[
"Pardo",
"Brian A.",
""
],
[
"Yang",
"Zixin",
""
]
] | We calculate the 2 post-Newtonian correction to the radiation reaction acceleration for non-spinning binary systems, which amounts to the 4.5 post-Newtonian correction to Newtonian acceleration. The calculation is carried out completely using the effective field theory approach. The center-of-mass corrections to the re... |
0801.0900 | Chad Galley | Chad R. Galley and B. L. Hu | Self-force on extreme mass ratio inspirals via curved spacetime
effective field theory | 22 pages, 5 figures; references added, revised Appendices B & C,
corrected typos, revisions throughout for clarification particularly in
Section IV.B; submitted to PRD | Phys.Rev.D79:064002,2009 | 10.1103/PhysRevD.79.064002 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this series we construct an effective field theory (EFT) in curved
spacetime to study gravitational radiation and backreaction effects. We begin
in this paper with a derivation of the self-force on a compact object moving in
the background spacetime of a supermassive black hole. The EFT approach
utilizes the dispa... | [
{
"created": "Mon, 7 Jan 2008 04:39:26 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jun 2008 15:10:49 GMT",
"version": "v2"
}
] | 2009-03-12 | [
[
"Galley",
"Chad R.",
""
],
[
"Hu",
"B. L.",
""
]
] | In this series we construct an effective field theory (EFT) in curved spacetime to study gravitational radiation and backreaction effects. We begin in this paper with a derivation of the self-force on a compact object moving in the background spacetime of a supermassive black hole. The EFT approach utilizes the dispari... |
gr-qc/9910108 | Andrzej Krolak | Andrzej Krolak | Nature of singularities in gravitational collapse | 11 pages, PTPTeX, references added, typos corrected, submitted to
Proceedings of the Yukawa-Kyoto International Seminar 99 | Prog.Theor.Phys.Suppl.136:45-56,1999 | 10.1143/PTPS.136.45 | null | gr-qc | null | We discuss several aspects of cosmic censorship hypothesis. There is evidence
both in favor and against the hypothesis. On one hand one can prove that cosmic
censorship holds in several special cases and on the other hand there is a
number of special solutions of Einstein equations in which it is violated. One
way to... | [
{
"created": "Fri, 29 Oct 1999 16:17:58 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jan 2000 12:40:58 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Krolak",
"Andrzej",
""
]
] | We discuss several aspects of cosmic censorship hypothesis. There is evidence both in favor and against the hypothesis. On one hand one can prove that cosmic censorship holds in several special cases and on the other hand there is a number of special solutions of Einstein equations in which it is violated. One way to r... |
1706.01267 | Bogdan Wojtsekhowski | B. Wojtsekhowski | Study of the one-way speed of light anisotropy with particle beams | 3 pages, Advances in Dark Matter and Particle Physics, Messina 2017 | EPJ Web Conf. 142 (2017) 01029 | 10.1051/epjconf/201714201029 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Concepts of high precision studies of the one-way speed of light anisotropy
are discussed. The high energy particle beam allows measurement of a one-way
speed of light anisotropy (SOLA) via analysis of the beam momentum variation
with sidereal phase without the use of synchronized clocks. High precision beam
position... | [
{
"created": "Mon, 5 Jun 2017 10:46:10 GMT",
"version": "v1"
}
] | 2017-06-06 | [
[
"Wojtsekhowski",
"B.",
""
]
] | Concepts of high precision studies of the one-way speed of light anisotropy are discussed. The high energy particle beam allows measurement of a one-way speed of light anisotropy (SOLA) via analysis of the beam momentum variation with sidereal phase without the use of synchronized clocks. High precision beam position m... |
0906.4714 | Juan A. Valiente-Kroon | Juan A. Valiente Kroon | A rigidity property of asymptotically simple spacetimes arising from
conformally flat data | 37 pages | Commun.Math.Phys.298:673-706,2010 | 10.1007/s00220-010-1002-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a time symmetric initial data set for the vacuum Einstein field
equations which is conformally flat near infinity, it is shown that the
solutions to the regular finite initial value problem at spatial infinity
extend smoothly through the critical sets where null infinity touches spatial
infinity if and only if ... | [
{
"created": "Thu, 25 Jun 2009 15:19:48 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Kroon",
"Juan A. Valiente",
""
]
] | Given a time symmetric initial data set for the vacuum Einstein field equations which is conformally flat near infinity, it is shown that the solutions to the regular finite initial value problem at spatial infinity extend smoothly through the critical sets where null infinity touches spatial infinity if and only if th... |
1112.2223 | Gonzalo Olmo | Gonzalo J. Olmo | Introduction to Modified Gravity: From the Cosmic Speedup Problem to
Quantum Gravity Phenomenology | 34 pages, 2 figures. Chapter written for the book "Aspects of Today's
Cosmology", Edited by: Antonio Alfonso-Faus, InTech Publishing, Rijeka,
Croatia, (2011), ISBN 978-953-307-626-3. The properly formatted version (26
pages) can be freely downloaded from the publisher's website | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These notes represent a summary of the introductory part of a course on
modified gravity delivered at several Spanish Universities (Granada, Valencia,
and Valladolid), at the University of Wisconsin-Milwaukee (WI, USA), and at the
Karl-Franzens Universitaet (Graz, Austria) during the period 2008-2011. We
begin with a... | [
{
"created": "Fri, 9 Dec 2011 22:24:05 GMT",
"version": "v1"
}
] | 2011-12-13 | [
[
"Olmo",
"Gonzalo J.",
""
]
] | These notes represent a summary of the introductory part of a course on modified gravity delivered at several Spanish Universities (Granada, Valencia, and Valladolid), at the University of Wisconsin-Milwaukee (WI, USA), and at the Karl-Franzens Universitaet (Graz, Austria) during the period 2008-2011. We begin with a d... |
1908.08141 | Vasilis Oikonomou | N. Chatzarakis, V.K. Oikonomou | Autonomous Dynamical System of Einstein-Gauss-Bonnet Cosmologies | Revised Version, AoP Accepted | null | 10.1016/j.aop.2020.168216 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the phase space of cosmological models in the context
of Einstein-Gauss-Bonnet theory. More specifically, we consider a generalized
dynamical system that encapsulates the main features of the theory and for the
cases that this is rendered autonomous, we analyze its equilibrium points and
stabl... | [
{
"created": "Wed, 21 Aug 2019 23:33:28 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 2020 15:49:00 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Chatzarakis",
"N.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this paper, we study the phase space of cosmological models in the context of Einstein-Gauss-Bonnet theory. More specifically, we consider a generalized dynamical system that encapsulates the main features of the theory and for the cases that this is rendered autonomous, we analyze its equilibrium points and stable ... |
1304.5544 | Philipp M\"osta | Philipp Moesta, Bruno C. Mundim, Joshua A. Faber, Roland Haas, Scott
C. Noble, Tanja Bode, Frank Loeffler, Christian D. Ott, Christian Reisswig,
Erik Schnetter | GRHydro: A new open source general-relativistic magnetohydrodynamics
code for the Einstein Toolkit | 58 pages, 20 figures | null | 10.1088/0264-9381/31/1/015005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the new general-relativistic magnetohydrodynamics (GRMHD)
capabilities of the Einstein Toolkit, an open-source community-driven numerical
relativity and computational relativistic astrophysics code. The GRMHD
extension of the Toolkit builds upon previous releases and implements the
evolution of relativisti... | [
{
"created": "Fri, 19 Apr 2013 20:55:41 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Moesta",
"Philipp",
""
],
[
"Mundim",
"Bruno C.",
""
],
[
"Faber",
"Joshua A.",
""
],
[
"Haas",
"Roland",
""
],
[
"Noble",
"Scott C.",
""
],
[
"Bode",
"Tanja",
""
],
[
"Loeffler",
"Frank",
""
],
[
... | We present the new general-relativistic magnetohydrodynamics (GRMHD) capabilities of the Einstein Toolkit, an open-source community-driven numerical relativity and computational relativistic astrophysics code. The GRMHD extension of the Toolkit builds upon previous releases and implements the evolution of relativistic ... |
0908.3283 | Kent Yagi | Kent Yagi and Takahiro Tanaka | DECIGO/BBO as a probe to constrain alternative theories of gravity | 4 pages, 3 figures; Accepted to Prog. Theor. Phys. Letters; Many
interpretations and some references have been added; Some Coding errors being
corrected and the final constraints came out stronger | Prog.Theor.Phys.123:1069-1078,2010 | 10.1143/PTP.123.1069 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate how strongly one can constrain the alternative theories of
gravity with deci-Hz gravitational wave interferometers such as DECIGO and BBO.
Here we discuss Brans-Dicke theory and massive graviton theories as typical
examples. We consider the inspiral of compact binaries composed of a neutron
star (NS) and... | [
{
"created": "Sun, 23 Aug 2009 04:11:05 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2010 15:07:18 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Yagi",
"Kent",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We calculate how strongly one can constrain the alternative theories of gravity with deci-Hz gravitational wave interferometers such as DECIGO and BBO. Here we discuss Brans-Dicke theory and massive graviton theories as typical examples. We consider the inspiral of compact binaries composed of a neutron star (NS) and a... |
1309.6461 | Keisuke Izumi | Keisuke Izumi, Je-An Gu, Yen Chin Ong | Acausality and Nonunique Evolution in Generalized Teleparallel Gravity | Version accepted by PRD (v2): 10 pages | Phys. Rev. D 89 (2014) 084025 | 10.1103/PhysRevD.89.084025 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show the existence of physical superluminal modes and acausality in the
Brans-Dicke type of extension of teleparallel gravity that includes F(T)
gravity and teleparallel dark energy as special cases. We derive the
characteristic hypersurface for the extra degrees of freedom in the theory,
thereby showing that the ... | [
{
"created": "Wed, 25 Sep 2013 11:01:50 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2014 07:01:38 GMT",
"version": "v2"
}
] | 2014-05-27 | [
[
"Izumi",
"Keisuke",
""
],
[
"Gu",
"Je-An",
""
],
[
"Ong",
"Yen Chin",
""
]
] | We show the existence of physical superluminal modes and acausality in the Brans-Dicke type of extension of teleparallel gravity that includes F(T) gravity and teleparallel dark energy as special cases. We derive the characteristic hypersurface for the extra degrees of freedom in the theory, thereby showing that the ti... |
gr-qc/0404123 | John McNabb | J W C McNabb, M Ashley, L S Finn, E Rotthoff, A Stuver, T
Summerscales, P Sutton, M Tibbits, K Thorne, K Zaleski | Overview of the BlockNormal Event Trigger Generator | GWDAW-8 proceedings, 6 pages, 2 figures | Class.Quant.Grav.21:S1705-S1710,2004 | 10.1088/0264-9381/21/20/013 | null | gr-qc | null | In the search for unmodeled gravitational wave bursts, there are a variety of
methods that have been proposed to generate candidate events from time series
data. Block Normal is a method of identifying candidate events by searching for
places in the data stream where the characteristic statistics of the data
change. ... | [
{
"created": "Thu, 29 Apr 2004 21:00:28 GMT",
"version": "v1"
}
] | 2009-05-13 | [
[
"McNabb",
"J W C",
""
],
[
"Ashley",
"M",
""
],
[
"Finn",
"L S",
""
],
[
"Rotthoff",
"E",
""
],
[
"Stuver",
"A",
""
],
[
"Summerscales",
"T",
""
],
[
"Sutton",
"P",
""
],
[
"Tibbits",
"M",
"... | In the search for unmodeled gravitational wave bursts, there are a variety of methods that have been proposed to generate candidate events from time series data. Block Normal is a method of identifying candidate events by searching for places in the data stream where the characteristic statistics of the data change. Th... |
gr-qc/0012045 | Claude Barrabes | C. Barrabes, P. A. Hogan | Braking--Radiation: An Energy Source for a Relativistic Fireball | 6 pages, LateX2e. Published in Phys. Lett. A | Phys.Lett. A272 (2000) 226 | 10.1016/S0375-9601(00)00442-4 | null | gr-qc | null | If the Schwarzschild black-hole is moving rectilinearly with uniform
3-velocity and suddenly stops, according to a distant observer, then we
demonstrate that this observer will see a spherical light--like shell or
"relativistic fireball" radiate outwards with energy equal to the original
kinetic energy of the black-h... | [
{
"created": "Tue, 12 Dec 2000 15:31:11 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Barrabes",
"C.",
""
],
[
"Hogan",
"P. A.",
""
]
] | If the Schwarzschild black-hole is moving rectilinearly with uniform 3-velocity and suddenly stops, according to a distant observer, then we demonstrate that this observer will see a spherical light--like shell or "relativistic fireball" radiate outwards with energy equal to the original kinetic energy of the black-hol... |
2012.00227 | Saulo Carneiro | Saulo Carneiro and C\'assio Pigozzo | Quasinormal modes and horizon area quantisation in Loop Quantum Gravity | 9 pages, two figures, version to appear in General Relativity and
Gravitation | Gen. Relat. Gravit. 54 (2022) 20 | 10.1007/s10714-022-02905-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is argued that the quantum of area between consecutive, high overtones
quasinormal modes of a black hole horizon coincides with the area gap predicted
by Loop Quantum Gravity, as long as the horizon is isolated and the
Barbero-Immirzi parameter is $\gamma \approx \sqrt{3}/6$, in agreement with the
value derived fr... | [
{
"created": "Tue, 1 Dec 2020 02:50:17 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2022 14:46:22 GMT",
"version": "v2"
}
] | 2022-02-16 | [
[
"Carneiro",
"Saulo",
""
],
[
"Pigozzo",
"Cássio",
""
]
] | It is argued that the quantum of area between consecutive, high overtones quasinormal modes of a black hole horizon coincides with the area gap predicted by Loop Quantum Gravity, as long as the horizon is isolated and the Barbero-Immirzi parameter is $\gamma \approx \sqrt{3}/6$, in agreement with the value derived from... |
0711.0079 | Ujjal Debnath | Writambhara Chakraborty, Ujjal Debnath and Subenoy Chakraborty | Generalized Cosmic Chaplygin Gas Model with or without Interaction | 8 latex pages, 4 figures | Grav.Cosmol.13:294-297,2007 | null | null | gr-qc | null | Recently developed Generalized Cosmic Chaplygin gas (GCCG) is studied as an
unified model of dark matter and dark energy. To explain the recent
accelerating phase, the Universe is assumed to have a mixture of radiation and
GCCG. The mixture is considered for without or with interaction. Solutions are
obtained for var... | [
{
"created": "Thu, 1 Nov 2007 07:04:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chakraborty",
"Writambhara",
""
],
[
"Debnath",
"Ujjal",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | Recently developed Generalized Cosmic Chaplygin gas (GCCG) is studied as an unified model of dark matter and dark energy. To explain the recent accelerating phase, the Universe is assumed to have a mixture of radiation and GCCG. The mixture is considered for without or with interaction. Solutions are obtained for vario... |
1112.4154 | Cemsinan Deliduman | Cemsinan Deliduman, K. Y. Ek\c{s}i and Vildan Kele\c{s} | Neutron star solutions in perturbative quadratic gravity | 19 pages, 9 figures. v2: Analysis on validity of perturbative
approach is added. References added. v3: Aesthetic improvements | null | 10.1088/1475-7516/2012/05/036 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the structure of neutron stars in R+\beta\ R^{\mu \nu} R_{\mu \nu}
gravity model with perturbative method. We obtain mass--radius relations for
six representative equations of state (EoSs). We find that, for |\beta| ~ 10^11
cm^2, the results differ substantially from the results of general relativity.
Some o... | [
{
"created": "Sun, 18 Dec 2011 13:29:29 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2012 08:57:47 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Apr 2012 02:14:07 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Deliduman",
"Cemsinan",
""
],
[
"Ekşi",
"K. Y.",
""
],
[
"Keleş",
"Vildan",
""
]
] | We study the structure of neutron stars in R+\beta\ R^{\mu \nu} R_{\mu \nu} gravity model with perturbative method. We obtain mass--radius relations for six representative equations of state (EoSs). We find that, for |\beta| ~ 10^11 cm^2, the results differ substantially from the results of general relativity. Some of ... |
1610.01718 | Susana Valdez Alvarado | Ricardo Becerril, Susana Valdez-Alvarado and Ulises Nucamendi | Obtaining mass parameters of compact objects from red-blue shifts
emitted by geodesic particles around them | 10 pages, 10 figures | Phys. Rev. D 94, 124024 (2016) | 10.1103/PhysRevD.94.124024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass parameters of compact objects such as Boson Stars, Schwarzschild,
Reissner Nordstrom and Kerr black holes are computed in terms of the measurable
redshift-blueshift (zred, zblue) of photons emitted by particles moving along
circular geodesics around these objects and the radius of their orbits. We
found boun... | [
{
"created": "Thu, 6 Oct 2016 02:24:33 GMT",
"version": "v1"
}
] | 2017-01-31 | [
[
"Becerril",
"Ricardo",
""
],
[
"Valdez-Alvarado",
"Susana",
""
],
[
"Nucamendi",
"Ulises",
""
]
] | The mass parameters of compact objects such as Boson Stars, Schwarzschild, Reissner Nordstrom and Kerr black holes are computed in terms of the measurable redshift-blueshift (zred, zblue) of photons emitted by particles moving along circular geodesics around these objects and the radius of their orbits. We found bounds... |
gr-qc/0111039 | Elizabeth Winstanley | E. Winstanley and O. Sarbach | On the linear stability of solitons and hairy black holes with a
negative cosmological constant: the even-parity sector | Minor modifications to notation, Latex, 45 pages | Class.Quant.Grav. 19 (2002) 689-724 | 10.1088/0264-9381/19/4/305 | null | gr-qc | null | Using a recently developed perturbation formalism based on curvature
quantities, we complete our investigation of the linear stability of black
holes and solitons with Yang-Mills hair and a negative cosmological constant.
We show that those solutions which have no linear instabilities under odd- and
even-parity spher... | [
{
"created": "Tue, 13 Nov 2001 19:44:44 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Dec 2001 12:04:59 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Winstanley",
"E.",
""
],
[
"Sarbach",
"O.",
""
]
] | Using a recently developed perturbation formalism based on curvature quantities, we complete our investigation of the linear stability of black holes and solitons with Yang-Mills hair and a negative cosmological constant. We show that those solutions which have no linear instabilities under odd- and even-parity spheric... |
1306.0206 | Gilbert Weinstein | Marcus A Khuri, Sumio Yamada, Gilbert Weinstein | On the Riemannian Penrose inequality with charge and the cosmic
censorship conjecture | 4 pages; 1st revision, added a generalization, added a reference; 2nd
revision, minor corrections | Res. Inst. Math. Sci. Kokyuroku, Kyoto Univ., #1862 (2012), 63-66 | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We note an area-charge inequality orignially due to Gibbons: if the outermost
horizon $S$ in an asymptotically flat electrovacuum initial data set is
connected then $|q|\leq r$, where $q$ is the total charge and $r=\sqrt{A/4\pi}$
is the area radius of $S$. A consequence of this inequality is that for
connected black ... | [
{
"created": "Sun, 2 Jun 2013 13:02:01 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jun 2013 14:42:04 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jul 2013 13:32:14 GMT",
"version": "v3"
}
] | 2014-01-17 | [
[
"Khuri",
"Marcus A",
""
],
[
"Yamada",
"Sumio",
""
],
[
"Weinstein",
"Gilbert",
""
]
] | We note an area-charge inequality orignially due to Gibbons: if the outermost horizon $S$ in an asymptotically flat electrovacuum initial data set is connected then $|q|\leq r$, where $q$ is the total charge and $r=\sqrt{A/4\pi}$ is the area radius of $S$. A consequence of this inequality is that for connected black ho... |
1012.1822 | Catarina Bastos Dr. | C. Bastos, O. Bertolami, N.C. Dias and J. N. Prata | Noncommutative Black Holes | Based on a talk presented by CB at 1st Mediterranean Conference on
Classical and Quantum Gravity 2009, Kolymbari, Crete, 14th-18th September
2009, Greece | J.Phys.Conf.Ser.222:012033,2010 | 10.1088/1742-6596/222/1/012033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One considers phase-space noncommutativity in the context of a
Kantowski-Sachs cosmological model to study the interior of a Schwarzschild
black hole. It is shown that the potential function of the corresponding
quantum cosmology problem has a local minimum. One deduces the thermodynamics
and show that the Hawking te... | [
{
"created": "Wed, 8 Dec 2010 18:40:00 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Bastos",
"C.",
""
],
[
"Bertolami",
"O.",
""
],
[
"Dias",
"N. C.",
""
],
[
"Prata",
"J. N.",
""
]
] | One considers phase-space noncommutativity in the context of a Kantowski-Sachs cosmological model to study the interior of a Schwarzschild black hole. It is shown that the potential function of the corresponding quantum cosmology problem has a local minimum. One deduces the thermodynamics and show that the Hawking temp... |
2103.02311 | Reginald Christian Bernardo | Reginald Christian Bernardo | Gravitational wave signatures from dark sector interactions | 13 pages, 3 figures, v2: discussion improved, references added, to
appear at PRD | Phys. Rev. D 104, 024070 (2021) | 10.1103/PhysRevD.104.024070 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the gravitational waves generated by the perturbations of
general relativistic black holes can be considered as a direct probe of the
existence of dark sector interactions. Working within the framework of
Horndeski theory and linear perturbations, we show that dark sector
interactions effectively reduce ... | [
{
"created": "Wed, 3 Mar 2021 10:39:50 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jul 2021 08:51:15 GMT",
"version": "v2"
}
] | 2021-07-30 | [
[
"Bernardo",
"Reginald Christian",
""
]
] | We show that the gravitational waves generated by the perturbations of general relativistic black holes can be considered as a direct probe of the existence of dark sector interactions. Working within the framework of Horndeski theory and linear perturbations, we show that dark sector interactions effectively reduce to... |
1710.08773 | David McNutt | Alan Coley, David McNutt | Identification of black hole horizons using scalar curvature invariants | 52 pages | Classical and Quantum Gravity, 35, 025013, 2018 | 10.1088/1361-6382/aa9804 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the concept of a geometric horizon, which is a surface
distinguished by the vanishing of certain curvature invariants which
characterize its special algebraic character. We motivate its use for the
detection of the event horizon of a stationary black hole by providing a set of
appropriate scalar polynomi... | [
{
"created": "Tue, 24 Oct 2017 13:49:35 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2017 08:52:15 GMT",
"version": "v2"
}
] | 2018-01-10 | [
[
"Coley",
"Alan",
""
],
[
"McNutt",
"David",
""
]
] | We introduce the concept of a geometric horizon, which is a surface distinguished by the vanishing of certain curvature invariants which characterize its special algebraic character. We motivate its use for the detection of the event horizon of a stationary black hole by providing a set of appropriate scalar polynomial... |
gr-qc/9409042 | Paulo Rodrigues Lima Vargas Moniz | O. Bertolami and P.V. Moniz | Decoherence of Homogeneous and Isotropic Metrics in the Presence of
Massive Vector Fields | 5 pages, DAMTP and CERN reports (Talk presented at the MG7
Conference, Stanford University, July 24-29, 1994--Contribution to the
Proceedings) | null | null | null | gr-qc | null | Retrieval of classical behaviour in quantum cosmology is usually discussed in
the framework of minisuperspace models in the presence of scalar fields
together with the inhomogeneous modes either of the gravitational or of the
scalar fields. In this work we propose alternatively a model where the scalar
field is repla... | [
{
"created": "Tue, 20 Sep 1994 14:12:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bertolami",
"O.",
""
],
[
"Moniz",
"P. V.",
""
]
] | Retrieval of classical behaviour in quantum cosmology is usually discussed in the framework of minisuperspace models in the presence of scalar fields together with the inhomogeneous modes either of the gravitational or of the scalar fields. In this work we propose alternatively a model where the scalar field is replace... |
2302.03291 | Hyeong-Chan Kim | Hyeong-Chan Kim | Steady heat conduction in general relativity | 16 pages, 1 figure, minor corrections, to appear in PTEP | Prog Theor Exp Phys (2023) | 10.1093/ptep/ptad062 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the steady state of heat conduction in general relativity
using a variational approach for two-fluid dynamics. We adopt coordinates based
on the Landau-Lifschitz observer because it allows us to describe
thermodynamics with heat, formulated in the Eckart decomposition, on a static
geometry. Through our... | [
{
"created": "Tue, 7 Feb 2023 06:58:20 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2023 11:12:47 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Mar 2023 03:26:02 GMT",
"version": "v3"
},
{
"created": "Wed, 10 May 2023 03:17:58 GMT",
"version": "v4"
}
] | 2023-06-28 | [
[
"Kim",
"Hyeong-Chan",
""
]
] | We investigate the steady state of heat conduction in general relativity using a variational approach for two-fluid dynamics. We adopt coordinates based on the Landau-Lifschitz observer because it allows us to describe thermodynamics with heat, formulated in the Eckart decomposition, on a static geometry. Through our a... |
gr-qc/0507086 | Roberto Gomez | W. Barreto, R. Gomez, L. Lehner, and J. Winicour | Gravitational Instability of a Kink | null | Phys.Rev. D54 (1996) 3834-3839 | 10.1103/PhysRevD.54.3834 | null | gr-qc | null | We study the equilibria of a self-gravitating scalar field in the region
outside a reflecting barrier. By introducing a potential difference between the
barrier and infinity, we create a kink which cannot decay to a zero energy
state. In the realm of small amplitude, the kink decays to a known static
solution of the ... | [
{
"created": "Wed, 20 Jul 2005 14:31:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barreto",
"W.",
""
],
[
"Gomez",
"R.",
""
],
[
"Lehner",
"L.",
""
],
[
"Winicour",
"J.",
""
]
] | We study the equilibria of a self-gravitating scalar field in the region outside a reflecting barrier. By introducing a potential difference between the barrier and infinity, we create a kink which cannot decay to a zero energy state. In the realm of small amplitude, the kink decays to a known static solution of the Ei... |
1909.05966 | Alvin Chua | Alvin J. K. Chua, Michele Vallisneri | Learning Bayesian posteriors with neural networks for gravitational-wave
inference | (Superior-to-)published version; source code and trained networks
available at https://github.com/vallis/truebayes | Phys. Rev. Lett. 124, 041102 (2020) | 10.1103/PhysRevLett.124.041102 | null | gr-qc astro-ph.IM stat.ML | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We seek to achieve the Holy Grail of Bayesian inference for
gravitational-wave astronomy: using deep-learning techniques to instantly
produce the posterior $p(\theta|D)$ for the source parameters $\theta$, given
the detector data $D$. To do so, we train a deep neural network to take as
input a signal + noise data set... | [
{
"created": "Thu, 12 Sep 2019 22:15:09 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Sep 2019 21:51:13 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jan 2020 21:30:31 GMT",
"version": "v3"
}
] | 2020-01-31 | [
[
"Chua",
"Alvin J. K.",
""
],
[
"Vallisneri",
"Michele",
""
]
] | We seek to achieve the Holy Grail of Bayesian inference for gravitational-wave astronomy: using deep-learning techniques to instantly produce the posterior $p(\theta|D)$ for the source parameters $\theta$, given the detector data $D$. To do so, we train a deep neural network to take as input a signal + noise data set (... |
gr-qc/0001105 | Yutaka Hosotani | Yutaka Hosotani and Jefferson Bjoraker | Monopoles and Dyons in the Pure Einstein-Yang-Mills Theory | 9 pages with 6 figures. To appear in the Proceedings for "The 6th
International Wigner Symposium", Istanbul, Turkey, August 1999 | null | null | UMN-TH-1839/00, NUC-MINN-00/2-T, BNL-NT-00/1 | gr-qc hep-th | null | In the pure Einstein-Yang-Mills theory in four dimensions there exist
monopole and dyon solutions. The spectrum of the solutions is discrete in
asymptotically flat or de Sitter space, whereas it is continuous in
asymptotically anti-de Sitter space. The solutions are regular everywhere and
specified with their mass, a... | [
{
"created": "Mon, 31 Jan 2000 22:27:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hosotani",
"Yutaka",
""
],
[
"Bjoraker",
"Jefferson",
""
]
] | In the pure Einstein-Yang-Mills theory in four dimensions there exist monopole and dyon solutions. The spectrum of the solutions is discrete in asymptotically flat or de Sitter space, whereas it is continuous in asymptotically anti-de Sitter space. The solutions are regular everywhere and specified with their mass, and... |
2310.05031 | Brett D. Altschul | Harry Oslislo and Brett Altschul | Exiting Inflation with a Smooth Scale Factor | 48 pages | Symmetry15, 2042 (2023) | 10.3390/sym15112042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The expectation that the physical expansion of space occurs smoothly may be
expressed mathematically as a requirement for continuity in the time derivative
of the metric scale factor of the Friedmann-Robertson-Walker cosmology. We
explore the consequences of imposing such a smoothness requirement, examining
the forms... | [
{
"created": "Sun, 8 Oct 2023 06:20:47 GMT",
"version": "v1"
}
] | 2024-02-07 | [
[
"Oslislo",
"Harry",
""
],
[
"Altschul",
"Brett",
""
]
] | The expectation that the physical expansion of space occurs smoothly may be expressed mathematically as a requirement for continuity in the time derivative of the metric scale factor of the Friedmann-Robertson-Walker cosmology. We explore the consequences of imposing such a smoothness requirement, examining the forms o... |
1807.00700 | Khireddine Nouicer | Sihem Zaabat and Khireddine Nouicer | Cosmology of the interacting Cubic Galileon | 30 pages, 9 fugures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the cosmological dynamics of the cubic Galileon field model
interacting with dark matter, where the interaction between the cosmic dark
sectors is proportional to Hubble parameter and dark energy density. The
background field equations are converted into an autonomous dynamical system of
first order equat... | [
{
"created": "Fri, 29 Jun 2018 15:59:46 GMT",
"version": "v1"
}
] | 2018-07-03 | [
[
"Zaabat",
"Sihem",
""
],
[
"Nouicer",
"Khireddine",
""
]
] | We consider the cosmological dynamics of the cubic Galileon field model interacting with dark matter, where the interaction between the cosmic dark sectors is proportional to Hubble parameter and dark energy density. The background field equations are converted into an autonomous dynamical system of first order equatio... |
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