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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1905.13542 | Dimitris Moustos | Benito A. Ju\'arez-Aubry, Dimitris Moustos | Asymptotic states for stationary Unruh-DeWitt detectors | 19 pages, 2 figures, Updated to match the published version | Phys. Rev. D 100, 025018 (2019) | 10.1103/PhysRevD.100.025018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the late-time asymptotic state of a stationary Unruh-DeWitt detector
interacting with a field in a thermal state. We work in an open system
framework, where the field plays the role of an environment for the detector.
The long-time interaction between the detector and the field is modelled with
the aid of a ... | [
{
"created": "Fri, 31 May 2019 12:13:09 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Aug 2019 13:54:38 GMT",
"version": "v2"
}
] | 2019-08-07 | [
[
"Juárez-Aubry",
"Benito A.",
""
],
[
"Moustos",
"Dimitris",
""
]
] | We study the late-time asymptotic state of a stationary Unruh-DeWitt detector interacting with a field in a thermal state. We work in an open system framework, where the field plays the role of an environment for the detector. The long-time interaction between the detector and the field is modelled with the aid of a on... |
2108.09567 | Marc Rodoreda | Dom\`enec Espriu and Marc Rodoreda | Effect of the cosmological parameters on gravitational waves: general
analysis | null | null | 10.1088/1361-6382/ac33bc | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Some time ago it was pointed out that the presence of cosmological components
could affect the propagation of gravitational waves (GW) beyond the usual
cosmological redshift and that such effects might be observable in pulsar
timing arrays. These analyses were done at leading order in the Hubble constant
$H_0$, which... | [
{
"created": "Sat, 21 Aug 2021 19:30:37 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Espriu",
"Domènec",
""
],
[
"Rodoreda",
"Marc",
""
]
] | Some time ago it was pointed out that the presence of cosmological components could affect the propagation of gravitational waves (GW) beyond the usual cosmological redshift and that such effects might be observable in pulsar timing arrays. These analyses were done at leading order in the Hubble constant $H_0$, which i... |
2207.11454 | Ashutosh Singh Dr | Ashutosh Singh and Anirudh Pradhan | Cosmic acceleration and ekpyrotic bounce with Chameleon field | 11 Pages | Int. J. Geom. Method Mod. Phys. 19 2250216 (2022) | 10.1142/S0219887822502164 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we explore the homogeneous and isotropic flat
Friedmann-Robertson-Walker (FRW) model in Chameleon cosmology. By considering a
non-minimal coupling between the scalar field and matter, we present a
non-singular bouncing cosmological scenario of the universe. The universe
initially exhibits the ekpyrot... | [
{
"created": "Sat, 23 Jul 2022 08:06:45 GMT",
"version": "v1"
}
] | 2022-12-06 | [
[
"Singh",
"Ashutosh",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | In this article, we explore the homogeneous and isotropic flat Friedmann-Robertson-Walker (FRW) model in Chameleon cosmology. By considering a non-minimal coupling between the scalar field and matter, we present a non-singular bouncing cosmological scenario of the universe. The universe initially exhibits the ekpyrotic... |
1510.05400 | Antonio C. Guti\'errez-Pi\~neres | Antonio C. Guti\'errez-Pi\~neres and Abra\~ao J. S. Capistrano | Motion of test particles in a magnetized conformastatic background | Submitted to the proceeding of MG14 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of exact conformastatic solutions of the Einstein-Maxwell field
equations is presented in which the gravitational and electromagnetic
potentials are completely determined by a harmonic function only. The motion of
test particles is investigated in the background of a space-time characterized
by this class of ... | [
{
"created": "Mon, 19 Oct 2015 09:19:32 GMT",
"version": "v1"
}
] | 2015-10-20 | [
[
"Gutiérrez-Piñeres",
"Antonio C.",
""
],
[
"Capistrano",
"Abraão J. S.",
""
]
] | A class of exact conformastatic solutions of the Einstein-Maxwell field equations is presented in which the gravitational and electromagnetic potentials are completely determined by a harmonic function only. The motion of test particles is investigated in the background of a space-time characterized by this class of so... |
1902.07917 | Daniela Pugliese Dr | D. Pugliese and H. Quevedo | Disclosing connections between black holes and naked singularities:
Horizon remnants, Killing throats and bottlenecks | 33 pages, 32 multi-panels figures, 3 Tables | null | 10.1140/epjc/s10052-019-6725-4 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of black holes and naked singularities by considering
stationary observers and light surfaces in Kerr spacetimes. We reconsider the
notion of Killing horizons from a special perspective by exploring the entire
family of Kerr metrics. To this end, we introduce the concepts of extended
plane, Ki... | [
{
"created": "Thu, 21 Feb 2019 08:53:15 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Pugliese",
"D.",
""
],
[
"Quevedo",
"H.",
""
]
] | We study the properties of black holes and naked singularities by considering stationary observers and light surfaces in Kerr spacetimes. We reconsider the notion of Killing horizons from a special perspective by exploring the entire family of Kerr metrics. To this end, we introduce the concepts of extended plane, Kill... |
1905.11525 | Salah Haggag | Salah Haggag, Samy A. Abdel-Hafeez, Moutaz Ramadan | A Closed Universe with Maximum Life-Time | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A closed universe with maximum life-time is constructed using optimal
control. Einstein's field equations are used with varying cosmological
"constant". The second time derivative of the Hubble parameter acts as the
control function in the optimal control model.
| [
{
"created": "Mon, 27 May 2019 21:55:36 GMT",
"version": "v1"
}
] | 2019-05-29 | [
[
"Haggag",
"Salah",
""
],
[
"Abdel-Hafeez",
"Samy A.",
""
],
[
"Ramadan",
"Moutaz",
""
]
] | A closed universe with maximum life-time is constructed using optimal control. Einstein's field equations are used with varying cosmological "constant". The second time derivative of the Hubble parameter acts as the control function in the optimal control model. |
1503.04113 | Diego Pavon | Rafael C. Nunes and Diego Pav\'on | Phantom behavior via cosmological creation of particles | 20 pages, 6 eps figures, to be published in the Physical Review D | null | 10.1103/PhysRevD.91.063526 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent determinations of the equation of state of dark energy hint that this
may well be of the phantom type, i.e., $w_{de} < -1$. If confirmed by future
experiments, this would strongly point to the existence of fields that violate
the dominant energy condition, which are known to present serious theoretical
difficu... | [
{
"created": "Fri, 13 Mar 2015 15:41:46 GMT",
"version": "v1"
}
] | 2015-06-24 | [
[
"Nunes",
"Rafael C.",
""
],
[
"Pavón",
"Diego",
""
]
] | Recent determinations of the equation of state of dark energy hint that this may well be of the phantom type, i.e., $w_{de} < -1$. If confirmed by future experiments, this would strongly point to the existence of fields that violate the dominant energy condition, which are known to present serious theoretical difficult... |
2101.09697 | Arthur Suvorov Dr. | Arthur G. Suvorov and Sebastian H. V\"olkel | Exact theory for the Rezzolla-Zhidenko metric and self-consistent
calculation of quasinormal modes | 11 pages, 4 figures, 2 tables. Minor updates to match PRD version | null | 10.1103/PhysRevD.103.044027 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A covariant, scalar-tensor gravity is constructed such that the static,
spherically symmetric Rezzolla-Zhidenko metric is an exact solution to the
theory. The equations describing gravitational perturbations of this spacetime,
which represents a generic black hole possessing an arbitrary number of hairs,
can then be ... | [
{
"created": "Sun, 24 Jan 2021 12:16:24 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2021 11:58:35 GMT",
"version": "v2"
}
] | 2021-02-24 | [
[
"Suvorov",
"Arthur G.",
""
],
[
"Völkel",
"Sebastian H.",
""
]
] | A covariant, scalar-tensor gravity is constructed such that the static, spherically symmetric Rezzolla-Zhidenko metric is an exact solution to the theory. The equations describing gravitational perturbations of this spacetime, which represents a generic black hole possessing an arbitrary number of hairs, can then be de... |
2312.01980 | Clemens S\"amann | Clemens S\"amann, Benedict Schinnerl, Roland Steinbauer, Robert
\v{S}varc | Cut-and-paste for impulsive gravitational waves with $\Lambda$: The
mathematical analysis | 26 pages | Lett. Math. Phys. Volume 114, article number 58 (2024) | 10.1007/s11005-024-01804-0 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Impulsive gravitational waves are theoretical models of short but violent
bursts of gravitational radiation. They are commonly described by two distinct
spacetime metrics, one of local Lipschitz regularity, the other one even
distributional. These two metrics are thought to be `physically equivalent'
since they can b... | [
{
"created": "Mon, 4 Dec 2023 15:49:12 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2024 21:52:58 GMT",
"version": "v2"
}
] | 2024-04-26 | [
[
"Sämann",
"Clemens",
""
],
[
"Schinnerl",
"Benedict",
""
],
[
"Steinbauer",
"Roland",
""
],
[
"Švarc",
"Robert",
""
]
] | Impulsive gravitational waves are theoretical models of short but violent bursts of gravitational radiation. They are commonly described by two distinct spacetime metrics, one of local Lipschitz regularity, the other one even distributional. These two metrics are thought to be `physically equivalent' since they can be ... |
1406.2451 | Lorenzo Iorio | Lorenzo Iorio | Orbital motions as gradiometers for post-Newtonian tidal effects | LaTex2e, 20 pages, no figures, 3 tables. Accepted for publication in
Frontiers in Astronomy and Space Sciences - Cosmology | Front. Astron. Space Sci. 1:3 2014 | 10.3389/fspas.2014.00003 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The direct long-term changes occurring in the orbital dynamics of a local
gravitationally bound binary system $S$ due to the post-Newtonian tidal
acceleration caused by an external massive source are investigated. A class of
systems made of a test particle $m$ rapidly orbiting with orbital frequency
$n_{\rm b}$ an as... | [
{
"created": "Tue, 10 Jun 2014 07:49:43 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2014 07:04:21 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Jul 2014 13:58:59 GMT",
"version": "v3"
}
] | 2014-08-15 | [
[
"Iorio",
"Lorenzo",
""
]
] | The direct long-term changes occurring in the orbital dynamics of a local gravitationally bound binary system $S$ due to the post-Newtonian tidal acceleration caused by an external massive source are investigated. A class of systems made of a test particle $m$ rapidly orbiting with orbital frequency $n_{\rm b}$ an astr... |
1910.12873 | Alexandru Lupsasca | Samuel E. Gralla, Alexandru Lupsasca | Lensing by Kerr Black Holes | 28 pages, 9 figures. v2: minor edits, matches published version | Phys. Rev. D 101, 044031 (2020) | 10.1103/PhysRevD.101.044031 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interpreting horizon-scale observations of astrophysical black holes demands
a general understanding of null geodesics in the Kerr spacetime. These may be
divided into two classes: "direct" rays that primarily determine the
observational appearance of a given source, and highly bent rays that produce a
nested sequenc... | [
{
"created": "Mon, 28 Oct 2019 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Feb 2020 22:45:43 GMT",
"version": "v2"
}
] | 2020-02-18 | [
[
"Gralla",
"Samuel E.",
""
],
[
"Lupsasca",
"Alexandru",
""
]
] | Interpreting horizon-scale observations of astrophysical black holes demands a general understanding of null geodesics in the Kerr spacetime. These may be divided into two classes: "direct" rays that primarily determine the observational appearance of a given source, and highly bent rays that produce a nested sequence ... |
1708.00941 | Henri Roesch | Hubert L. Bray and Henri P. Roesch | Null Geometry and the Penrose Conjecture | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we survey recent progress on the Null Penrose Conjecture,
including a proof of the conjecture for smooth null cones that are foliated by
doubly convex spheres.
| [
{
"created": "Wed, 2 Aug 2017 21:43:32 GMT",
"version": "v1"
}
] | 2017-08-04 | [
[
"Bray",
"Hubert L.",
""
],
[
"Roesch",
"Henri P.",
""
]
] | In this paper, we survey recent progress on the Null Penrose Conjecture, including a proof of the conjecture for smooth null cones that are foliated by doubly convex spheres. |
1801.08358 | Luis Herrera | L. Herrera | New definition of complexity for self-gravitating fluid distributions:
The spherically symmetric, static case | 10 pages Revtex. Typos corrected. Published in Phys.Rev.D | Phys. Rev. D97, 044010 (2018) | 10.1103/PhysRevD.97.044010 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We put forward a new definition of complexity, for static and spherically
symmetric self--gravitating systems, based on a quantity, hereafter referred to
as complexity factor, that appears in the orthogonal splitting of the Riemann
tensor, in the context of general relativity. We start by assuming that the
homogeneou... | [
{
"created": "Thu, 25 Jan 2018 11:23:55 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2018 09:29:22 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Herrera",
"L.",
""
]
] | We put forward a new definition of complexity, for static and spherically symmetric self--gravitating systems, based on a quantity, hereafter referred to as complexity factor, that appears in the orthogonal splitting of the Riemann tensor, in the context of general relativity. We start by assuming that the homogeneous ... |
1007.3851 | Paul Reska | Tomislav Prokopec, Paul Reska | Scalar cosmological perturbations from inflationary black holes | 41 pages, 11 figures, published version | JCAP 1103:050,2011 | 10.1088/1475-7516/2011/03/050 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the correction to the scale invariant power spectrum of a scalar
field on de Sitter space from small black holes that formed during a
pre-inflationary matter dominated era. The formation probability of such black
holes is estimated from primordial Gaussian density fluctuations. We determine
the correction to... | [
{
"created": "Thu, 22 Jul 2010 10:40:09 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2011 16:47:22 GMT",
"version": "v2"
}
] | 2011-04-01 | [
[
"Prokopec",
"Tomislav",
""
],
[
"Reska",
"Paul",
""
]
] | We study the correction to the scale invariant power spectrum of a scalar field on de Sitter space from small black holes that formed during a pre-inflationary matter dominated era. The formation probability of such black holes is estimated from primordial Gaussian density fluctuations. We determine the correction to t... |
1302.1399 | Sourav Bhattacharya | Sourav Bhattacharya | Black holes and the positive cosmological constant | 171pp, 1 figure; PhD thesis submitted to Jadavpur University,
Kolkata, from S.N. Bose National Centre for Basic Sciences, Kolkata;
Supervisor-Prof. Amitabha Lahiri | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address some aspects of black hole spacetimes endowed with a positive
cosmological constant, i.e. black holes located inside a cosmological event
horizon. First we establish a general criterion for existence of cosmological
event horizons. Using the geometrical set up built for this, we study classical
black hole ... | [
{
"created": "Wed, 6 Feb 2013 15:08:45 GMT",
"version": "v1"
}
] | 2013-02-07 | [
[
"Bhattacharya",
"Sourav",
""
]
] | We address some aspects of black hole spacetimes endowed with a positive cosmological constant, i.e. black holes located inside a cosmological event horizon. First we establish a general criterion for existence of cosmological event horizons. Using the geometrical set up built for this, we study classical black hole no... |
2303.01737 | Muhammad Sharif | M. Sharif and Arooj Fatima | Traversable Wormhole Solutions admitting Karmarkar Condition in $f(R,T)$
Theory | 25 pages, 7 figures | Eur. Phys. J. Plus 138(2023)196 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we evaluate traversable wormhole solutions through Karmarkar
condition in $f(R,T)$ theory, where $T$ is the trace of the energy-momentum
tensor and $R$ represents the Ricci scalar. We develop a wormhole shape
function for the static traversable wormhole geometry by using the embedding
class-I technique... | [
{
"created": "Fri, 3 Mar 2023 06:41:50 GMT",
"version": "v1"
}
] | 2023-03-06 | [
[
"Sharif",
"M.",
""
],
[
"Fatima",
"Arooj",
""
]
] | In this paper, we evaluate traversable wormhole solutions through Karmarkar condition in $f(R,T)$ theory, where $T$ is the trace of the energy-momentum tensor and $R$ represents the Ricci scalar. We develop a wormhole shape function for the static traversable wormhole geometry by using the embedding class-I technique. ... |
1407.2013 | Francisco Lobo | Tiberiu Harko, Francisco S. N. Lobo | Generalized curvature-matter couplings in modified gravity | 55 pages, to appear as a review paper in a Special Issue of Galaxies:
"Beyond Standard Gravity and Cosmology". V2: minor corrections and references
added. Matches published version | Galaxies 2 (2014) 3, 410-465 | 10.3390/galaxies2030410 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we review a plethora of modified theories of gravity with
generalized curvature-matter couplings. The explicit nonminimal couplings, for
instance, between an arbitrary function of the scalar curvature $R$ and the
Lagrangian density of matter, induces a non-vanishing covariant derivative of
the energy-mo... | [
{
"created": "Tue, 8 Jul 2014 09:40:01 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jul 2014 09:28:47 GMT",
"version": "v2"
}
] | 2014-07-29 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, we review a plethora of modified theories of gravity with generalized curvature-matter couplings. The explicit nonminimal couplings, for instance, between an arbitrary function of the scalar curvature $R$ and the Lagrangian density of matter, induces a non-vanishing covariant derivative of the energy-mome... |
2010.16276 | Yuri Obukhov | Yuri N. Obukhov | Parity violation in Poincar\'e gauge gravity | 27 pages, Revtex style, minor corrections, references added,
contribution to Proceedings of Teleparallel Gravity Workshop Tartu 2020 in
Special Issue of International Journal of Geometric Methods in Modern Physics | null | 10.1142/S0219887821500225 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the parity violation issue in the Poincar\'e gauge theory of
gravity for the two classes of models which are built as natural extensions of
the Einstein-Cartan theory. The conservation laws of the matter currents are
revisited and we clarify the derivation of the effective Einstein field
equation and the s... | [
{
"created": "Fri, 30 Oct 2020 13:53:19 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Nov 2020 14:10:47 GMT",
"version": "v2"
}
] | 2020-11-24 | [
[
"Obukhov",
"Yuri N.",
""
]
] | We analyse the parity violation issue in the Poincar\'e gauge theory of gravity for the two classes of models which are built as natural extensions of the Einstein-Cartan theory. The conservation laws of the matter currents are revisited and we clarify the derivation of the effective Einstein field equation and the str... |
gr-qc/9208001 | null | Jonathan J. Halliwell | The Interpretation of Quantum Cosmological Models | 18 pages | null | null | CTP preprint 2130 (July 1992) | gr-qc hep-th | null | We consider the problem of extracting physical predictions from the wave
function of the universe in quantum cosmological models. We state the features
of quantum cosmology an interpretational scheme should confront. We discuss the
Everett interpretation, and extensions of it, and their application to quantum
cosmolo... | [
{
"created": "Wed, 5 Aug 1992 15:30:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Halliwell",
"Jonathan J.",
""
]
] | We consider the problem of extracting physical predictions from the wave function of the universe in quantum cosmological models. We state the features of quantum cosmology an interpretational scheme should confront. We discuss the Everett interpretation, and extensions of it, and their application to quantum cosmology... |
gr-qc/0306124 | Gyula Bene | Ga'bor Helesfai and Gyula Bene (Institute for Theoretical Physics,
Eo"tvo"s University, Budapest) | A numerical study of spectral properties of the area operator in loop
quantum gravity | LaTeX, 9 pages, 4 figures | null | null | null | gr-qc | null | The lowest 37000 eigenvalues of the area operator in loop quantum gravity is
calculated and studied numerically. We obtain an asymptotical formula for the
eigenvalues as a function of their sequential number. The multiplicity of the
lowest few hundred eigenvalues is also determined and the smoothed spectral
density i... | [
{
"created": "Mon, 30 Jun 2003 08:44:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Helesfai",
"Ga'bor",
"",
"Institute for Theoretical Physics,\n Eo\"tvo\"s University, Budapest"
],
[
"Bene",
"Gyula",
"",
"Institute for Theoretical Physics,\n Eo\"tvo\"s University, Budapest"
]
] | The lowest 37000 eigenvalues of the area operator in loop quantum gravity is calculated and studied numerically. We obtain an asymptotical formula for the eigenvalues as a function of their sequential number. The multiplicity of the lowest few hundred eigenvalues is also determined and the smoothed spectral density is ... |
1112.5559 | Nobuyuki Sakai | Nobuyuki Sakai, Takashi Tamaki | What happens to Q-balls if $Q$ is so large? | 9 pages, 10 figures, results for large $\kappa$ added, to appear in
PRD | null | 10.1103/PhysRevD.85.104008 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the system of a gravitating Q-ball, there is a maximum charge $Q_{{\rm
max}}$ inevitably, while in flat spacetime there is no upper bound on $Q$ in
typical models such as the Affleck-Dine model. Theoretically the charge $Q$ is
a free parameter, and phenomenologically it could increase by charge
accumulation. We ad... | [
{
"created": "Fri, 23 Dec 2011 11:33:24 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Apr 2012 13:06:21 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Sakai",
"Nobuyuki",
""
],
[
"Tamaki",
"Takashi",
""
]
] | In the system of a gravitating Q-ball, there is a maximum charge $Q_{{\rm max}}$ inevitably, while in flat spacetime there is no upper bound on $Q$ in typical models such as the Affleck-Dine model. Theoretically the charge $Q$ is a free parameter, and phenomenologically it could increase by charge accumulation. We addr... |
1908.10377 | Leo Stein | Leo C. Stein | qnm: A Python package for calculating Kerr quasinormal modes, separation
constants, and spherical-spheroidal mixing coefficients | 3 pages, 0 figures. Matches version accepted by the Journal of Open
Source Software. The source repository: https://github.com/duetosymmetry/qnm
, PyPI entry: https://pypi.org/project/qnm/ , documentation:
https://qnm.readthedocs.io . Suggestions and pull requests welcome | J. Open Source Softw., 4(42), 1683 (2019) | 10.21105/joss.01683 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | $\mathtt{qnm}$ is an open-source Python package for computing the Kerr
quasinormal mode frequencies, angular separation constants, and
spherical-spheroidal mixing coefficients. The $\mathtt{qnm}$ package includes a
Leaver solver with the Cook-Zalutskiy spectral approach to the angular sector,
and a caching mechanism ... | [
{
"created": "Tue, 27 Aug 2019 18:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 2019 19:24:39 GMT",
"version": "v2"
}
] | 2019-10-03 | [
[
"Stein",
"Leo C.",
""
]
] | $\mathtt{qnm}$ is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coefficients. The $\mathtt{qnm}$ package includes a Leaver solver with the Cook-Zalutskiy spectral approach to the angular sector, and a caching mechanism to... |
1702.03832 | Xavier Calmet | Xavier Calmet and Iber\^e Kuntz | What is modified gravity and how to differentiate it from particle dark
matter? | 12 pages | Eur. Phys. J. C, 77 2 (2017) 132 | 10.1140/epjc/s10052-017-4695-y | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An obvious criterion to classify theories of modified gravity is to identify
their gravitational degrees of freedom and their coupling to the metric and the
matter sector. Using this simple idea, we show that any theory which depends on
the curvature invariants is equivalent to general relativity in the presence of
n... | [
{
"created": "Fri, 10 Feb 2017 13:17:05 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2017 20:06:21 GMT",
"version": "v2"
}
] | 2017-03-01 | [
[
"Calmet",
"Xavier",
""
],
[
"Kuntz",
"Iberê",
""
]
] | An obvious criterion to classify theories of modified gravity is to identify their gravitational degrees of freedom and their coupling to the metric and the matter sector. Using this simple idea, we show that any theory which depends on the curvature invariants is equivalent to general relativity in the presence of new... |
gr-qc/0401025 | Claudio Benedito Silva Furtado | Claudio Furtado, A. M. de M. Carvalho, L. C. Garcia de Andrade, F.
Moraes | Holonomy, Aharonov-Bohm effect and phonon scattering in superfluids | 15 pages, Revtex4 | null | null | null | gr-qc | null | In this article we discuss the analogy between superfluids and a spinning
thick cosmic string. We use the geometrical approach to obtain the geometrical
phases for a phonon in the presence of a vortex. We use loop variables for a
geometric description of Aharonov-Bohm effect in these systems. We use holonomy
transfor... | [
{
"created": "Thu, 8 Jan 2004 10:56:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Furtado",
"Claudio",
""
],
[
"Carvalho",
"A. M. de M.",
""
],
[
"de Andrade",
"L. C. Garcia",
""
],
[
"Moraes",
"F.",
""
]
] | In this article we discuss the analogy between superfluids and a spinning thick cosmic string. We use the geometrical approach to obtain the geometrical phases for a phonon in the presence of a vortex. We use loop variables for a geometric description of Aharonov-Bohm effect in these systems. We use holonomy transforma... |
0707.4026 | Theodore A. Jacobson | Ted Jacobson | Renormalization and black hole entropy in Loop Quantum Gravity | 8 pages; v2: references added, typos corrected, version to appear in
CQG | Class.Quant.Grav.24:4875-4879,2007 | 10.1088/0264-9381/24/18/N02 | null | gr-qc hep-th | null | Microscopic state counting for a black hole in Loop Quantum Gravity yields a
result proportional to horizon area, and inversely proportional to Newton's
constant and the Immirzi parameter. It is argued here that before this result
can be compared to the Bekenstein-Hawking entropy of a macroscopic black hole,
the scal... | [
{
"created": "Thu, 26 Jul 2007 23:33:10 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Aug 2007 02:11:25 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Jacobson",
"Ted",
""
]
] | Microscopic state counting for a black hole in Loop Quantum Gravity yields a result proportional to horizon area, and inversely proportional to Newton's constant and the Immirzi parameter. It is argued here that before this result can be compared to the Bekenstein-Hawking entropy of a macroscopic black hole, the scale ... |
gr-qc/0506082 | Iosif Khriplovich | I.B. Khriplovich | Quantized Black Holes, Their Spectrum and Radiation | 15 pages, content of few talks given at conferences this summer | Phys.Atom.Nucl.71:671-680,2008 | 10.1134/S1063778808040078 | null | gr-qc hep-th | null | Under quite natural general assumptions, the following results are obtained.
The maximum entropy of a quantized surface is demonstrated to be proportional
to the surface area in the classical limit. The general structure of the
horizon spectrum is found. The discrete spectrum of thermal radiation of a
black hole Unde... | [
{
"created": "Wed, 15 Jun 2005 06:02:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Khriplovich",
"I. B.",
""
]
] | Under quite natural general assumptions, the following results are obtained. The maximum entropy of a quantized surface is demonstrated to be proportional to the surface area in the classical limit. The general structure of the horizon spectrum is found. The discrete spectrum of thermal radiation of a black hole Under ... |
0810.1961 | Barry Wardell | Adrian C. Ottewill and Barry Wardell | Quasi-local contribution to the scalar self-force: Non-geodesic Motion | 11 pages, 1 figure, corrected typo in Eq. 2.8 | Phys.Rev.D79:024031,2009 | 10.1103/PhysRevD.79.024031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend our previous calculation of the quasi-local contribution to the
self-force on a scalar particle to general (not necessarily geodesic) motion in
a general spacetime. In addition to the general case and the case of a particle
at rest in a stationary spacetime, we consider as examples a particle held at
rest i... | [
{
"created": "Fri, 10 Oct 2008 22:12:16 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2008 17:19:18 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Feb 2009 00:02:04 GMT",
"version": "v3"
},
{
"created": "Mon, 16 Jan 2012 14:34:54 GMT",
"version": "v4"
}
] | 2012-01-17 | [
[
"Ottewill",
"Adrian C.",
""
],
[
"Wardell",
"Barry",
""
]
] | We extend our previous calculation of the quasi-local contribution to the self-force on a scalar particle to general (not necessarily geodesic) motion in a general spacetime. In addition to the general case and the case of a particle at rest in a stationary spacetime, we consider as examples a particle held at rest in ... |
2106.10235 | Shao-Jiang Wang | Ligong Bian, Rong-Gen Cai, Shuo Cao, Zhoujian Cao, He Gao, Zong-Kuan
Guo, Kejia Lee, Di Li, Jing Liu, Youjun Lu, Shi Pi, Jian-Min Wang, Shao-Jiang
Wang, Yan Wang, Tao Yang, Xing-Yu Yang, Shenghua Yu, Xin Zhang | The Gravitational-Wave Physics II: Progress | v1, 93 pages, 18 figures, prepared as a status review of project
report for Sci. China Phys. Mech. Astron.; v2, 95 pages, minor revision,
references added, accepted for publication in Sci. China Phys. Mech. Astron;
v3, to match the published version | Sci. China Phys. Mech. Astron. 64, 120401 (2021) | 10.1007/s11433-021-1781-x | null | gr-qc astro-ph.CO astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been a half-decade since the first direct detection of gravitational
waves, which signifies the coming of the era of the gravitational-wave
astronomy and gravitational-wave cosmology. The increasing number of the
detected gravitational-wave events has revealed the promising capability of
constraining various a... | [
{
"created": "Thu, 17 Jun 2021 04:05:58 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2021 14:59:23 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Nov 2021 08:53:42 GMT",
"version": "v3"
}
] | 2021-11-04 | [
[
"Bian",
"Ligong",
""
],
[
"Cai",
"Rong-Gen",
""
],
[
"Cao",
"Shuo",
""
],
[
"Cao",
"Zhoujian",
""
],
[
"Gao",
"He",
""
],
[
"Guo",
"Zong-Kuan",
""
],
[
"Lee",
"Kejia",
""
],
[
"Li",
"Di",
""... | It has been a half-decade since the first direct detection of gravitational waves, which signifies the coming of the era of the gravitational-wave astronomy and gravitational-wave cosmology. The increasing number of the detected gravitational-wave events has revealed the promising capability of constraining various asp... |
2308.12669 | Giuseppe Gaetano Luciano Dr | Giuseppe Gaetano Luciano and Emmanuel Saridakis | $P-v$ criticalities, phase transitions and geometrothermodynamics of
charged AdS black holes from Kaniadakis statistics | 15 pages, 11 labelled figures, comments are welcome | null | null | null | gr-qc cond-mat.stat-mech hep-th | http://creativecommons.org/licenses/by/4.0/ | Boltzmann entropy-based thermodynamics of charged anti-de Sitter (AdS) black
holes has been shown to exhibit physically interesting features, such as $P-V$
criticalities and van der Waals-like phase transitions. In this work we extend
the study of these critical phenomena to Kaniadakis theory, which is a
non-extensiv... | [
{
"created": "Thu, 24 Aug 2023 09:20:10 GMT",
"version": "v1"
}
] | 2023-08-25 | [
[
"Luciano",
"Giuseppe Gaetano",
""
],
[
"Saridakis",
"Emmanuel",
""
]
] | Boltzmann entropy-based thermodynamics of charged anti-de Sitter (AdS) black holes has been shown to exhibit physically interesting features, such as $P-V$ criticalities and van der Waals-like phase transitions. In this work we extend the study of these critical phenomena to Kaniadakis theory, which is a non-extensive ... |
gr-qc/9606077 | Thibault Damour | Thibault Damour | Theoretical aspects of gravitational radiation | 14 pages, Latex, uses sprocl.sty, to appear in the Proceedings of
GR14, eds M. Francaviglia et al, World Scientific | null | null | IHES/P/95/101 | gr-qc | null | A central problem in gravitational wave research is the {\it generation
problem}, i.e., the problem of relating the outgoing gravitational wave field
to the structure and motion of the material source. This problem has become, in
recent years, of increased interest in view of the development of a worldwide
network of... | [
{
"created": "Thu, 27 Jun 1996 17:19:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Damour",
"Thibault",
""
]
] | A central problem in gravitational wave research is the {\it generation problem}, i.e., the problem of relating the outgoing gravitational wave field to the structure and motion of the material source. This problem has become, in recent years, of increased interest in view of the development of a worldwide network of g... |
1803.11094 | Eleni-Alexandra Kontou | Peter J. Brown, Christopher J. Fewster, Eleni-Alexandra Kontou | A singularity theorem for Einstein-Klein-Gordon theory | 19 pages | null | 10.1007/s10714-018-2446-5 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking's singularity theorem concerns matter obeying the strong energy
condition (SEC), which means that all observers experience a nonnegative
effective energy density (EED), thereby guaranteeing the timelike convergence
property. However, there are models that do not satisfy the SEC and therefore
lie outside the s... | [
{
"created": "Thu, 29 Mar 2018 14:29:41 GMT",
"version": "v1"
}
] | 2018-09-19 | [
[
"Brown",
"Peter J.",
""
],
[
"Fewster",
"Christopher J.",
""
],
[
"Kontou",
"Eleni-Alexandra",
""
]
] | Hawking's singularity theorem concerns matter obeying the strong energy condition (SEC), which means that all observers experience a nonnegative effective energy density (EED), thereby guaranteeing the timelike convergence property. However, there are models that do not satisfy the SEC and therefore lie outside the sco... |
1106.2709 | Derek Lee | Derek Lee | Scattering of massive scalars by Schwarzschild black holes | 8 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Klein-Gordon equation for the wave function of a single massive scalar is
written in spherical and parabolic coordinates in the presence of a
Schwarzschild background, and some semi-classical techniques for deriving
asymptotic results are considered. In addition to the well-known logarithmic
phase shift due to th... | [
{
"created": "Tue, 14 Jun 2011 13:29:19 GMT",
"version": "v1"
}
] | 2011-06-15 | [
[
"Lee",
"Derek",
""
]
] | The Klein-Gordon equation for the wave function of a single massive scalar is written in spherical and parabolic coordinates in the presence of a Schwarzschild background, and some semi-classical techniques for deriving asymptotic results are considered. In addition to the well-known logarithmic phase shift due to the ... |
2105.11965 | Rabin Banerjee | Rabin Banerjee | Covariant Formulation of the Newton-Hooke Particle and its Canonical
Analysis | 21 pages, No figures, Accepted in Physical Review D | Phys. Rev. D 103, 125009 (2021) | 10.1103/PhysRevD.103.125009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A covariant formulation for the Newton-Hooke particle is presented by
following an algorithm developed by us \cite{BMM1, BMM2, BMM3}. It naturally
leads to a coupling with the Newton-Cartan geometry. From this result we
provide an understanding of gravitation in a Newtonian geometric background.
Using Dirac's constra... | [
{
"created": "Mon, 24 May 2021 06:23:45 GMT",
"version": "v1"
}
] | 2021-06-16 | [
[
"Banerjee",
"Rabin",
""
]
] | A covariant formulation for the Newton-Hooke particle is presented by following an algorithm developed by us \cite{BMM1, BMM2, BMM3}. It naturally leads to a coupling with the Newton-Cartan geometry. From this result we provide an understanding of gravitation in a Newtonian geometric background. Using Dirac's constrain... |
gr-qc/9406013 | Takashi Torii | Takashi Torii, Kei-ichi Maeda and Takashi Tachizawa | Non-Abelian Black Holes and Catastrophe Theory I : Neutral Type | 27pages, LaTex style, WU-AP/39/94. Figures are available (hard
copies) upon requests [64L514@cfi.waseda.ac.jp (T.Torii)] | Phys.Rev. D51 (1995) 1510-1524 | 10.1103/PhysRevD.51.1510 | null | gr-qc | null | We re-analyze the globally neutral non-Abelian black holes and present a
unified picture, classifying them into two types; Type I (black holes with
massless non-Abelian field) and Type II (black holes with ``massive"
non-Abelian field). For the Type II, there are two branches: The black hole in
the high-entropy branc... | [
{
"created": "Wed, 8 Jun 1994 03:39:33 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Torii",
"Takashi",
""
],
[
"Maeda",
"Kei-ichi",
""
],
[
"Tachizawa",
"Takashi",
""
]
] | We re-analyze the globally neutral non-Abelian black holes and present a unified picture, classifying them into two types; Type I (black holes with massless non-Abelian field) and Type II (black holes with ``massive" non-Abelian field). For the Type II, there are two branches: The black hole in the high-entropy branch ... |
1810.06446 | Miloslav Svec | Miloslav Svec | Quantum Structure of Spacetime and Its Entropy in a Cyclic Universe with
Negative Curvature II: Data Analysis and Results | 29 pages, 8 Figures, 12 Tables; Table caption of the Table IV and the
equation (9.1) corrected; change in the address | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Part I of this work we show that Friedmann equations and the
thermodynamical Gibbs-Duhem relation determine a general form of the Hubble
function called Model E which predicts a dynamical Dark Energy and Dark Matter
with equations of state w_0=-1 and w_M=0, respectively. We identify Dark Energy
and Dark Matter... | [
{
"created": "Mon, 15 Oct 2018 15:06:40 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2018 12:49:58 GMT",
"version": "v2"
}
] | 2018-11-21 | [
[
"Svec",
"Miloslav",
""
]
] | In the Part I of this work we show that Friedmann equations and the thermodynamical Gibbs-Duhem relation determine a general form of the Hubble function called Model E which predicts a dynamical Dark Energy and Dark Matter with equations of state w_0=-1 and w_M=0, respectively. We identify Dark Energy and Dark Matter w... |
1503.02433 | Behrouz Mirza | Mohammad Bagher Jahani Poshteh, Behrouz Mirza, Fatemeh Oboudiat | Generalized Ehrenfest's Equations and phase transition in Black Holes | 6 pages | IJMPD Vol. 24, No. 3 (2015) 1550029 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize Ehrenfest's equations to systems having two work terms, i.e.
systems with three degrees of freedom. For black holes with two work terms we
obtain nine equations instead of two to be satisfied at the critical point of a
second order phase transition. We finally generalize this method to a system
with an ... | [
{
"created": "Mon, 9 Mar 2015 11:36:43 GMT",
"version": "v1"
}
] | 2015-03-10 | [
[
"Poshteh",
"Mohammad Bagher Jahani",
""
],
[
"Mirza",
"Behrouz",
""
],
[
"Oboudiat",
"Fatemeh",
""
]
] | We generalize Ehrenfest's equations to systems having two work terms, i.e. systems with three degrees of freedom. For black holes with two work terms we obtain nine equations instead of two to be satisfied at the critical point of a second order phase transition. We finally generalize this method to a system with an ar... |
2209.02426 | Maria Petronikolou | Shreya Banerjee, Maria Petronikolou and Emmanuel N. Saridakis | Alleviating $H_0$ Tension with New Gravitational Scalar Tensor Theories | 9 pages, 7 figures, version to appear in Phys.Rev.D | null | 10.1103/PhysRevD.108.024012 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmological applications of new gravitational
scalar-tensor theories and we analyze them in the light of $H_0$ tension. In
these theories the Lagrangian contains the Ricci scalar and its first and
second derivatives in a specific combination that makes them free of ghosts,
thus corresponding to he... | [
{
"created": "Tue, 6 Sep 2022 11:49:31 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2023 14:49:20 GMT",
"version": "v2"
}
] | 2023-07-19 | [
[
"Banerjee",
"Shreya",
""
],
[
"Petronikolou",
"Maria",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the cosmological applications of new gravitational scalar-tensor theories and we analyze them in the light of $H_0$ tension. In these theories the Lagrangian contains the Ricci scalar and its first and second derivatives in a specific combination that makes them free of ghosts, thus corresponding to heal... |
2006.09716 | Dirk Puetzfeld | Gerald Neumann, Dirk Puetzfeld, Guillermo F. Rubilar | Extended gravitational clock compass: new exact solutions and
simulations | 20 pages, 18 figures | Phys. Rev. D 102, 044027 (2020) | 10.1103/PhysRevD.102.044027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By extending the framework of the gravitational clock compass we show how a
suitably prepared set of clocks can be used to extract information about the
gravitational field in the context of General Relativity. Conceptual
differences between the extended and the standard clock compass are
highlighted. Particular atte... | [
{
"created": "Wed, 17 Jun 2020 08:30:57 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2020 09:00:04 GMT",
"version": "v2"
}
] | 2020-08-21 | [
[
"Neumann",
"Gerald",
""
],
[
"Puetzfeld",
"Dirk",
""
],
[
"Rubilar",
"Guillermo F.",
""
]
] | By extending the framework of the gravitational clock compass we show how a suitably prepared set of clocks can be used to extract information about the gravitational field in the context of General Relativity. Conceptual differences between the extended and the standard clock compass are highlighted. Particular attent... |
1901.09899 | Francisco Jos\'e Maldonado Torralba | J.A.R. Cembranos, J. Gigante Valcarcel, F.J. Maldonado Torralba | Non-geodesic incompleteness in Poincar\'e gauge gravity | 9 pages, 2 figures. Invited article for the Special Issue of Entropy
"Modified Gravity: From Black Holes Entropy to Current Cosmology II". arXiv
admin note: text overlap with arXiv:1609.07814 | Entropy 2019, 21(3), 280 | 10.3390/e21030280 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we review the study of singularities in Poincar\'e gauge
theories of gravity. Since one of the most recent studies uses the appearance
of black hole regions of arbitrary dimension as an indicator of singular
behaviour, we also give some explicit examples of these structures and study
how particles behave... | [
{
"created": "Sun, 27 Jan 2019 15:24:58 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2019 10:30:52 GMT",
"version": "v2"
}
] | 2019-03-21 | [
[
"Cembranos",
"J. A. R.",
""
],
[
"Valcarcel",
"J. Gigante",
""
],
[
"Torralba",
"F. J. Maldonado",
""
]
] | In this work we review the study of singularities in Poincar\'e gauge theories of gravity. Since one of the most recent studies uses the appearance of black hole regions of arbitrary dimension as an indicator of singular behaviour, we also give some explicit examples of these structures and study how particles behave a... |
gr-qc/9501023 | null | Dieter R. Brill (University of Maryland) | Black Hole Collisions, Analytic Continuation, and Cosmic Censorship | Misprints corrected, some Figures (LaTeX picture environment) made
even more beautiful, References added. This is the text of lectures at the
First Samos Meeting on Cosmology Geometry and Relativity, to appear in
Springer Lecture Notes in Physics. | null | null | UMD PP 95-88 | gr-qc | null | Exact solutions of the Einstein-Maxwell equations that describe moving black
holes in a cosmological setting are discussed with the aim of discovering the
global structure and testing cosmic censorship. Continuation beyond the
horizons present in these solutions is necessary in order to identify the
global structure.... | [
{
"created": "Fri, 20 Jan 1995 17:45:27 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 1995 22:47:44 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Brill",
"Dieter R.",
"",
"University of Maryland"
]
] | Exact solutions of the Einstein-Maxwell equations that describe moving black holes in a cosmological setting are discussed with the aim of discovering the global structure and testing cosmic censorship. Continuation beyond the horizons present in these solutions is necessary in order to identify the global structure. T... |
1810.06193 | I-Ching Yang | I-Ching Yang | The energy of the universe in the Bianchi type-II cosmological model | 8 pages | null | 10.1142/S021773231950192X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To investigate the energy of Bianchi type-II cosmological model, I used the
energy-momentum complexes of Einstein and M{\o}ller and obtained the zero total
energy in these two prescriptions. This result reinforces the viewpoint of
Albrow and Tryon that the universe must have a zero net value for all conserved
quantit... | [
{
"created": "Mon, 15 Oct 2018 06:24:14 GMT",
"version": "v1"
}
] | 2019-08-21 | [
[
"Yang",
"I-Ching",
""
]
] | To investigate the energy of Bianchi type-II cosmological model, I used the energy-momentum complexes of Einstein and M{\o}ller and obtained the zero total energy in these two prescriptions. This result reinforces the viewpoint of Albrow and Tryon that the universe must have a zero net value for all conserved quantitie... |
2006.03771 | Chengjie Fu | Chengjie Fu, Jing Liu, Tao Zhu, Hongwei Yu, Puxun Wu | Resonance instability of primordial gravitational waves during inflation
in Chern-Simons gravity | 16 pages, 4 figures | Eur. Phys. J. C 81 (2021) 3, 204 | 10.1140/epjc/s10052-021-09001-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate axion inflation where the gravitational Chern-Simons term is
coupled to a periodic function of the inflaton. We find that tensor
perturbations with different polarizations are amplified in different ways by
the Chern-Simons coupling. Depending on the model parameters, the resonance
amplification result... | [
{
"created": "Sat, 6 Jun 2020 03:32:07 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2020 02:11:37 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Jul 2020 10:25:26 GMT",
"version": "v3"
},
{
"created": "Mon, 8 Mar 2021 05:02:12 GMT",
"version": "v4"
}
] | 2021-03-09 | [
[
"Fu",
"Chengjie",
""
],
[
"Liu",
"Jing",
""
],
[
"Zhu",
"Tao",
""
],
[
"Yu",
"Hongwei",
""
],
[
"Wu",
"Puxun",
""
]
] | We investigate axion inflation where the gravitational Chern-Simons term is coupled to a periodic function of the inflaton. We find that tensor perturbations with different polarizations are amplified in different ways by the Chern-Simons coupling. Depending on the model parameters, the resonance amplification results ... |
0912.2447 | B. V. Ivanov | B.V.Ivanov | The fundamental spherically symmetric fluid model | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that an effective anisotropic spherically symmetric fluid model
with heat flow can absorb the addition to a perfect fluid of pressure
anisotropy, heat flow, bulk and shear viscosity, electric field and null fluid.
| [
{
"created": "Sat, 12 Dec 2009 19:16:01 GMT",
"version": "v1"
}
] | 2009-12-15 | [
[
"Ivanov",
"B. V.",
""
]
] | It is shown that an effective anisotropic spherically symmetric fluid model with heat flow can absorb the addition to a perfect fluid of pressure anisotropy, heat flow, bulk and shear viscosity, electric field and null fluid. |
gr-qc/0508110 | Frans Pretorius | Frans Pretorius and Matthew W. Choptuik | Adaptive Mesh Refinement for Coupled Elliptic-Hyperbolic Systems | 31 pages, 15 figures; replaced with published version | J.Comput.Phys. 218 (2006) 246-274 | 10.1016/j.jcp.2006.02.011 | null | gr-qc | null | We present a modification to the Berger and Oliger adaptive mesh refinement
algorithm designed to solve systems of coupled, non-linear, hyperbolic and
elliptic partial differential equations. Such systems typically arise during
constrained evolution of the field equations of general relativity. The novel
aspect of th... | [
{
"created": "Sun, 28 Aug 2005 19:46:50 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2006 13:41:43 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Pretorius",
"Frans",
""
],
[
"Choptuik",
"Matthew W.",
""
]
] | We present a modification to the Berger and Oliger adaptive mesh refinement algorithm designed to solve systems of coupled, non-linear, hyperbolic and elliptic partial differential equations. Such systems typically arise during constrained evolution of the field equations of general relativity. The novel aspect of this... |
1108.0832 | Carlo Rovelli | Carlo Rovelli | On the structure of a background independent quantum theory: Hamilton
function, transition amplitudes, classical limit and continuous limit | 7 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hamilton function is a powerful tool for studying the classical limit of
quantum systems, which remains meaningful in background-independent systems. In
quantum gravity, it clarifies the physical interpretation of the transitions
amplitudes and their truncations.
| [
{
"created": "Wed, 3 Aug 2011 12:41:08 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 2011 10:20:25 GMT",
"version": "v2"
}
] | 2011-08-05 | [
[
"Rovelli",
"Carlo",
""
]
] | The Hamilton function is a powerful tool for studying the classical limit of quantum systems, which remains meaningful in background-independent systems. In quantum gravity, it clarifies the physical interpretation of the transitions amplitudes and their truncations. |
1603.05689 | David Kubiznak | Devin Hansen, David Kubiznak, Robert B. Mann | Universality of P-V Criticality in Horizon Thermodynamics | 11 pages, 5 figures | null | 10.1007/JHEP01(2017)047 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study P-V criticality of black holes in Lovelock gravities in the context
of horizon thermodynamics. The corresponding first law of horizon
thermodynamics emerges as one of the Einstein-Lovelock equations and assumes
the universal (independent of matter content) form dE=TdS-PdV, where P is
identified with the tota... | [
{
"created": "Thu, 17 Mar 2016 21:08:05 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Hansen",
"Devin",
""
],
[
"Kubiznak",
"David",
""
],
[
"Mann",
"Robert B.",
""
]
] | We study P-V criticality of black holes in Lovelock gravities in the context of horizon thermodynamics. The corresponding first law of horizon thermodynamics emerges as one of the Einstein-Lovelock equations and assumes the universal (independent of matter content) form dE=TdS-PdV, where P is identified with the total ... |
gr-qc/0512044 | Michael Maziashvili | M. T. Makhviladze, M. A. Maziashvili and D. V. Nozadze | GUP in presence of extra dimensions and lifetime of mini black holes | 4 pages | null | null | null | gr-qc | null | Based on the general considerations of quantum mechanics and gravity the
generalized uncertainty principle (GUP) is determined in higher-dimensional
case and on the brane, respectively. The result is used to evaluate the effect
of GUP on the dynamics of evaporation and lifetime of mini black holes in the
brane-world ... | [
{
"created": "Wed, 7 Dec 2005 08:24:12 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2005 13:09:00 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Makhviladze",
"M. T.",
""
],
[
"Maziashvili",
"M. A.",
""
],
[
"Nozadze",
"D. V.",
""
]
] | Based on the general considerations of quantum mechanics and gravity the generalized uncertainty principle (GUP) is determined in higher-dimensional case and on the brane, respectively. The result is used to evaluate the effect of GUP on the dynamics of evaporation and lifetime of mini black holes in the brane-world mo... |
2307.13380 | Soichiro Morisaki | Soichiro Morisaki, Rory Smith, Leo Tsukada, Surabhi Sachdev, Simon
Stevenson, Colm Talbot, Aaron Zimmerman | Rapid localization and inference on compact binary coalescences with the
Advanced LIGO-Virgo-KAGRA gravitational-wave detector network | 19 pages, 9 figures | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a rapid parameter estimation framework for compact binary
coalescence (CBC) signals observed by the LIGO-Virgo-KAGRA (LVK) detector
network. The goal of our framework is to enable optimal source localization of
binary neutron star (BNS) signals in low latency, as well as improve the
overall scalability of ... | [
{
"created": "Tue, 25 Jul 2023 10:01:38 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Morisaki",
"Soichiro",
""
],
[
"Smith",
"Rory",
""
],
[
"Tsukada",
"Leo",
""
],
[
"Sachdev",
"Surabhi",
""
],
[
"Stevenson",
"Simon",
""
],
[
"Talbot",
"Colm",
""
],
[
"Zimmerman",
"Aaron",
""
]
] | We present a rapid parameter estimation framework for compact binary coalescence (CBC) signals observed by the LIGO-Virgo-KAGRA (LVK) detector network. The goal of our framework is to enable optimal source localization of binary neutron star (BNS) signals in low latency, as well as improve the overall scalability of fu... |
gr-qc/9808067 | Rong Gen Cai | Rong-Gen Cai, Kwang-Sup Soh (SNU) | Topological black holes in the dimensionally continued gravity | Revtex, 20 Pages, no figures, minor modification and two references
added | Phys.Rev.D59:044013,1999 | 10.1103/PhysRevD.59.044013 | null | gr-qc | null | We investigate the topological black holes in a special class of Lovelock
gravity. In the odd dimensions, the action is the Chern-Simons form for the
anti-de Sitter group. In the even dimensions, it is the Euler density
constructed with the Lorentz part of the anti-de Sitter curvature tensor. The
Lovelock coefficient... | [
{
"created": "Tue, 25 Aug 1998 13:32:24 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 1998 10:42:12 GMT",
"version": "v2"
}
] | 2009-07-09 | [
[
"Cai",
"Rong-Gen",
"",
"SNU"
],
[
"Soh",
"Kwang-Sup",
"",
"SNU"
]
] | We investigate the topological black holes in a special class of Lovelock gravity. In the odd dimensions, the action is the Chern-Simons form for the anti-de Sitter group. In the even dimensions, it is the Euler density constructed with the Lorentz part of the anti-de Sitter curvature tensor. The Lovelock coefficients ... |
1204.4339 | John Baez | John C. Baez and Derek K. Wise | Teleparallel Gravity as a Higher Gauge Theory | 36 pages; v3: minor corrections | Communications in Mathematical Physics, Vol. 333 No. 1 (2015),
153-186 | 10.1007/s00220-014-2178-7 | null | gr-qc math.CT math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that general relativity can be viewed as a higher gauge theory
involving a categorical group, or 2-group, called the teleparallel 2-group. On
any semi-Riemannian manifold M, we first construct a principal 2-bundle with
the Poincare 2-group as its structure 2-group. Any flat metric-preserving
connection on M g... | [
{
"created": "Thu, 19 Apr 2012 12:48:47 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jun 2012 12:16:14 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Jul 2014 02:26:04 GMT",
"version": "v3"
}
] | 2017-08-22 | [
[
"Baez",
"John C.",
""
],
[
"Wise",
"Derek K.",
""
]
] | We show that general relativity can be viewed as a higher gauge theory involving a categorical group, or 2-group, called the teleparallel 2-group. On any semi-Riemannian manifold M, we first construct a principal 2-bundle with the Poincare 2-group as its structure 2-group. Any flat metric-preserving connection on M giv... |
gr-qc/0001022 | Victor Flambaum | V. V. Flambaum and J. C. Berengut | Atom made from charged elementary black hole | 22 pages, 4 figures | Phys.Rev.D63:084010,2001 | 10.1103/PhysRevD.63.084010 | null | gr-qc astro-ph hep-th physics.atom-ph | null | It is believed that there may have been a large number of black holes formed
in the very early universe. These would have quantised masses. A charged
``elementary black hole'' (with the minimum possible mass) can capture
electrons, protons and other charged particles to form a ``black hole atom''.
We find the spectru... | [
{
"created": "Mon, 10 Jan 2000 21:38:49 GMT",
"version": "v1"
}
] | 2009-08-18 | [
[
"Flambaum",
"V. V.",
""
],
[
"Berengut",
"J. C.",
""
]
] | It is believed that there may have been a large number of black holes formed in the very early universe. These would have quantised masses. A charged ``elementary black hole'' (with the minimum possible mass) can capture electrons, protons and other charged particles to form a ``black hole atom''. We find the spectrum ... |
1110.4051 | Sebastian Steinhaus | Sebastian Steinhaus | Perfect discretization of path integrals | 4 pages, 1 figure, based on a talk given at Loops '11, Madrid, to
appear in Journal of Physics: Conference Series (JPCS) | J. Phys.: Conf. Ser. 360 012025 (2012) | 10.1088/1742-6596/360/1/012025 | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to obtain a well-defined path integral one often employs
discretizations. In the case of General Relativity these generically break
diffeomorphism symmetry, which has severe consequences since these symmetries
determine the dynamics of the corresponding system.
In this article we consider the path integral... | [
{
"created": "Tue, 18 Oct 2011 17:03:02 GMT",
"version": "v1"
}
] | 2012-05-24 | [
[
"Steinhaus",
"Sebastian",
""
]
] | In order to obtain a well-defined path integral one often employs discretizations. In the case of General Relativity these generically break diffeomorphism symmetry, which has severe consequences since these symmetries determine the dynamics of the corresponding system. In this article we consider the path integral of ... |
gr-qc/0312078 | Jiliang Jing | Jiliang Jing | Can the "brick wall" model present the same results in different
coordinate representations? | 8 pages, Phys. Rev. D in press | Phys.Rev. D69 (2004) 024011 | 10.1103/PhysRevD.69.024011 | null | gr-qc astro-ph hep-th | null | By using the 't Hooft's "brick wall" model and the Pauli-Villars
regularization scheme we calculate the statistical-mechanical entropies arising
from the quantum scalar field in different coordinate settings, such as the
Painlev\'{e} and Lemaitre coordinates. At first glance, it seems that the
entropies would be diff... | [
{
"created": "Wed, 17 Dec 2003 14:22:05 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Jing",
"Jiliang",
""
]
] | By using the 't Hooft's "brick wall" model and the Pauli-Villars regularization scheme we calculate the statistical-mechanical entropies arising from the quantum scalar field in different coordinate settings, such as the Painlev\'{e} and Lemaitre coordinates. At first glance, it seems that the entropies would be differ... |
2006.10077 | Andrey Shoom A | Andrey A. Shoom | Gravitational Faraday and Spin-Hall Effects of Light | 11 pages | Phys. Rev. D 104, 084007 (2021) | 10.1103/PhysRevD.104.084007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational Faraday and its dual spin-Hall effects of light arise in
space-times of non-zero angular momentum. These effects were studied in
stationary, asymptotically flat space-times. Here we study these effects in
arbitrary, non-stationary, asymptotically flat space-times. These effects arise
due to interact... | [
{
"created": "Wed, 17 Jun 2020 18:01:13 GMT",
"version": "v1"
}
] | 2021-10-04 | [
[
"Shoom",
"Andrey A.",
""
]
] | The gravitational Faraday and its dual spin-Hall effects of light arise in space-times of non-zero angular momentum. These effects were studied in stationary, asymptotically flat space-times. Here we study these effects in arbitrary, non-stationary, asymptotically flat space-times. These effects arise due to interactio... |
1612.00482 | Riccardo Sturani | Stefano Foffa (Geneva U., Dept. Theor. Phys. and Geneva U., CAP),
Pierpaolo Mastrolia (Padua U. and INFN, Padua), Riccardo Sturani (IIP,
Natal), Christian Sturm (Wurzburg U.) | Effective field theory approach to the gravitational two-body dynamics,
at fourth post-Newtonian order and quintic in the Newton constant | Version accepted for publication in Phys. Rev. D. Appendix C added
with details of amplitude computations | Phys. Rev. D 95, 104009 (2017) | 10.1103/PhysRevD.95.104009 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Working within the post-Newtonian (PN) approximation to General Relativity,
we use the effective field theory (EFT) framework to study the conservative
dynamics of the two-body motion at fourth PN order, at fifth order in the
Newton constant. This is one of the missing pieces preventing the computation
of the full La... | [
{
"created": "Thu, 1 Dec 2016 21:41:14 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jan 2017 22:35:24 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Mar 2017 12:42:56 GMT",
"version": "v3"
}
] | 2017-05-17 | [
[
"Foffa",
"Stefano",
"",
"Geneva U., Dept. Theor. Phys. and Geneva U., CAP"
],
[
"Mastrolia",
"Pierpaolo",
"",
"Padua U. and INFN, Padua"
],
[
"Sturani",
"Riccardo",
"",
"IIP,\n Natal"
],
[
"Sturm",
"Christian",
"",
"Wurzburg U."
]
] | Working within the post-Newtonian (PN) approximation to General Relativity, we use the effective field theory (EFT) framework to study the conservative dynamics of the two-body motion at fourth PN order, at fifth order in the Newton constant. This is one of the missing pieces preventing the computation of the full Lagr... |
1409.3395 | Christian Marinoni | Christian Marinoni and Heinrich Steigerwald (Aix-Marseille University) | On the dynamical emergence of de Sitter spacetime | 17 pages, 2 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present and discuss an asynchronous coordinate system covering de Sitter
spacetime, notably in a complete way in 1+1 dimensions. The new coordinates
have several interesting cosmological properties: the worldlines of comoving
($x^i=const$) observers are geodesics, cosmic time is finite in the past, and
the coordin... | [
{
"created": "Thu, 11 Sep 2014 11:24:40 GMT",
"version": "v1"
}
] | 2014-09-12 | [
[
"Marinoni",
"Christian",
"",
"Aix-Marseille University"
],
[
"Steigerwald",
"Heinrich",
"",
"Aix-Marseille University"
]
] | We present and discuss an asynchronous coordinate system covering de Sitter spacetime, notably in a complete way in 1+1 dimensions. The new coordinates have several interesting cosmological properties: the worldlines of comoving ($x^i=const$) observers are geodesics, cosmic time is finite in the past, and the coordinat... |
1701.00037 | Harold Erbin | Harold Erbin | Janis-Newman algorithm: generating rotating and NUT charged black holes | 68 pages, invited review for Universe; v2: sec. 1-4, 6 and app. B
match published version, sec. 5, 7, 8 and app. A, C are specific to arxiv
version | Universe 2017, 3(1), 19 | 10.3390/universe3010019 | LPTENS/17/02 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review we present the most general form of the Janis--Newman
algorithm. This extension allows to generate configurations which contain all
bosonic fields with spin less than or equal to two (real and complex scalar
fields, gauge fields, metric field) and with five of the six parameters of the
Pleba\'nski-Demi... | [
{
"created": "Sat, 31 Dec 2016 00:20:31 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Mar 2017 15:35:44 GMT",
"version": "v2"
}
] | 2017-03-08 | [
[
"Erbin",
"Harold",
""
]
] | In this review we present the most general form of the Janis--Newman algorithm. This extension allows to generate configurations which contain all bosonic fields with spin less than or equal to two (real and complex scalar fields, gauge fields, metric field) and with five of the six parameters of the Pleba\'nski-Demia\... |
1710.04544 | Ivan De Martino | Ivan De Martino, Antonio Capolupo | Kinetic theory of Jean Instability in Eddington-inspired Born-Infield
gravity | 6 pages, 3 figures. Accepted for publication in EPJC | Eur. Phys. J. C (2017) 77: 715 | 10.1140/epjc/s10052-017-5300-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the stability of self-gravitating systems which dynamics is
investigated using the collisionless Boltzmann equation, and the modified
Poisson equation of Eddington-inspired Born-Infield gravity. These equations
provide a description of the Jeans paradigm used to determine the critical
scale above which suc... | [
{
"created": "Thu, 12 Oct 2017 14:37:43 GMT",
"version": "v1"
}
] | 2017-10-31 | [
[
"De Martino",
"Ivan",
""
],
[
"Capolupo",
"Antonio",
""
]
] | We analyze the stability of self-gravitating systems which dynamics is investigated using the collisionless Boltzmann equation, and the modified Poisson equation of Eddington-inspired Born-Infield gravity. These equations provide a description of the Jeans paradigm used to determine the critical scale above which such ... |
1612.07077 | Janusz Garecki Prof | Janusz Garecki | Do gravitational waves carry energy-momentum? A reappraisal | 7 pages, no figures, Revtex 4, lecture delivered on Conference
"Varcosmofun'16", Szczecin, 12-17 September 2016, Szczecin, Poland, EU. arXiv
admin note: text overlap with arXiv:1306.5121, arXiv:1209.4807 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After direct detection gravitational radiation in 2015 many authors are
publishing remakes of their old articles about this radiation. I decided to
follow this line in my Lecture delivered at the Conference "Varcosmofun'16"
(12-17 September 2016, Szczecin, Poland, EU). Namely, I have presented at this
Conference an u... | [
{
"created": "Wed, 21 Dec 2016 12:39:19 GMT",
"version": "v1"
}
] | 2016-12-22 | [
[
"Garecki",
"Janusz",
""
]
] | After direct detection gravitational radiation in 2015 many authors are publishing remakes of their old articles about this radiation. I decided to follow this line in my Lecture delivered at the Conference "Varcosmofun'16" (12-17 September 2016, Szczecin, Poland, EU). Namely, I have presented at this Conference an upd... |
gr-qc/0701100 | Mark J. Hadley | Mark J Hadley | Classical Dark Matter | 5 pages | null | null | null | gr-qc | null | Classical particle-like solutions of field equations such as general
relativity, could account for dark matter. Such particles would not interact
quantum mechanically and would have negligible interactions apart from
gravitation. As a relic from the big bang, they would be a candidate for cold
dark matter consistent ... | [
{
"created": "Wed, 17 Jan 2007 17:26:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hadley",
"Mark J",
""
]
] | Classical particle-like solutions of field equations such as general relativity, could account for dark matter. Such particles would not interact quantum mechanically and would have negligible interactions apart from gravitation. As a relic from the big bang, they would be a candidate for cold dark matter consistent wi... |
1212.2901 | David Hilditch | David Hilditch, Sebastiano Bernuzzi, Marcus Thierfelder, Zhoujian Cao,
Wolfgang Tichy and Bernd Bruegmann | Compact binary evolutions with the Z4c formulation | null | Phys. Rev. D 88, 084057 (2013) | 10.1103/PhysRevD.88.084057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical relativity simulations of compact binaries with the Z4c and BSSNOK
formulations are compared. The Z4c formulation is advantageous in every case
considered. In simulations of non-vacuum spacetimes the constraint violations
due to truncation errors are between one and three orders of magnitude lower in
the Z4... | [
{
"created": "Wed, 12 Dec 2012 17:44:15 GMT",
"version": "v1"
}
] | 2013-11-05 | [
[
"Hilditch",
"David",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Thierfelder",
"Marcus",
""
],
[
"Cao",
"Zhoujian",
""
],
[
"Tichy",
"Wolfgang",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | Numerical relativity simulations of compact binaries with the Z4c and BSSNOK formulations are compared. The Z4c formulation is advantageous in every case considered. In simulations of non-vacuum spacetimes the constraint violations due to truncation errors are between one and three orders of magnitude lower in the Z4c ... |
0803.3204 | Carsten Busch | C. Busch | The semiclassical stability of de Sitter spacetime | 47 pages, 3 figures | null | null | DESY 92-131, ITP-UH 9/92 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | de Sitter spacetime and Bunch-Davies vacuum are a solution to the
semiclassical Einstein-Schroedinger equations describing the evolution of
spacetime geometry and a massive scalar quantum field with arbitrary coupling
to curvature. The stability of this solution is proven by calculating the
renormalized energy moment... | [
{
"created": "Fri, 21 Mar 2008 18:30:16 GMT",
"version": "v1"
}
] | 2008-03-24 | [
[
"Busch",
"C.",
""
]
] | de Sitter spacetime and Bunch-Davies vacuum are a solution to the semiclassical Einstein-Schroedinger equations describing the evolution of spacetime geometry and a massive scalar quantum field with arbitrary coupling to curvature. The stability of this solution is proven by calculating the renormalized energy momentum... |
1507.03175 | V H Satheeshkumar | V. H. Satheeshkumar | Aspects of Black Holes in Gravitational Theories with Broken Lorentz and
Diffeomorphism Symmetries | XIV+147 pages, 19 figures, PhD Thesis, Baylor University | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Since Stephen Hawking discovered that black holes emit thermal radiation,
black holes have become the theoretical laboratories for testing our ideas on
quantum gravity. This dissertation is devoted to the study of singularities,
the formation of black holes by gravitational collapse and the global structure
of spacet... | [
{
"created": "Sun, 12 Jul 2015 01:11:40 GMT",
"version": "v1"
}
] | 2015-07-14 | [
[
"Satheeshkumar",
"V. H.",
""
]
] | Since Stephen Hawking discovered that black holes emit thermal radiation, black holes have become the theoretical laboratories for testing our ideas on quantum gravity. This dissertation is devoted to the study of singularities, the formation of black holes by gravitational collapse and the global structure of spacetim... |
0901.3264 | Mattias N. R. Wohlfarth | Raffaele Punzi, Frederic P. Schuller, Mattias N.R. Wohlfarth | Massive motion in Brans-Dicke geometry and beyond | 12 pages | null | 10.1103/PhysRevD.79.124025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravity theories that can be viewed as dynamics for area metric manifolds,
for which Brans-Dicke theory presents a recently studied example, require for
their physical interpretation the identification of the distinguished curves
that serve as the trajectories of light and massive matter. Complementing
previous resul... | [
{
"created": "Wed, 21 Jan 2009 12:57:08 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Punzi",
"Raffaele",
""
],
[
"Schuller",
"Frederic P.",
""
],
[
"Wohlfarth",
"Mattias N. R.",
""
]
] | Gravity theories that can be viewed as dynamics for area metric manifolds, for which Brans-Dicke theory presents a recently studied example, require for their physical interpretation the identification of the distinguished curves that serve as the trajectories of light and massive matter. Complementing previous results... |
2310.00030 | Sanjay Mandal | Sanjay Mandal, Sneha Pradhan, P.K. Sahoo, and Tiberiu Harko | Cosmological observational constraints on the power law $f(Q)$ type
modified gravity theory | EPJC published version | Eur. Phys. J. C (2023) 83:1141 | 10.1140/epjc/s10052-023-12339-4 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In modern cosmology, the curiosity of ultimately understanding the nature of
the dark energy controlling the recent acceleration of the Universe motivates
us to explore its properties by using some novel approaches. In this work, to
explore the properties of dark energy we adopt the modified $f(Q)$ gravity
theory, wh... | [
{
"created": "Fri, 29 Sep 2023 04:56:29 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Dec 2023 08:25:33 GMT",
"version": "v2"
}
] | 2023-12-19 | [
[
"Mandal",
"Sanjay",
""
],
[
"Pradhan",
"Sneha",
""
],
[
"Sahoo",
"P. K.",
""
],
[
"Harko",
"Tiberiu",
""
]
] | In modern cosmology, the curiosity of ultimately understanding the nature of the dark energy controlling the recent acceleration of the Universe motivates us to explore its properties by using some novel approaches. In this work, to explore the properties of dark energy we adopt the modified $f(Q)$ gravity theory, wher... |
1806.10031 | Oscar Lasso Andino | Oscar Lasso Andino | RG-2 flow, mass and entropy | Typos corrected, references added | Class. Quantum Grav. 36 065011 (2019) | 10.1088/1361-6382/ab05f6 | IFT-UAM/CSIC-18-063 | gr-qc math.DG | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The RG-2 flow is the two-loop approximation for the world-sheet non-linear
sigma model renormalization group flow. The first truncation of the flow is the
well known Ricci flow, at two loops higher order curvature terms appear,
changing almost completely the behaviour of the evolution equation. In this
article we stu... | [
{
"created": "Tue, 26 Jun 2018 14:46:48 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jul 2018 15:16:15 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Mar 2019 17:08:59 GMT",
"version": "v3"
}
] | 2019-03-12 | [
[
"Andino",
"Oscar Lasso",
""
]
] | The RG-2 flow is the two-loop approximation for the world-sheet non-linear sigma model renormalization group flow. The first truncation of the flow is the well known Ricci flow, at two loops higher order curvature terms appear, changing almost completely the behaviour of the evolution equation. In this article we study... |
1708.06763 | Michael Florian Wondrak | Michael Florian Wondrak, Marcus Bleicher, Piero Nicolini | Black Holes and High Energy Physics: From Astrophysics to Large Extra
Dimensions | 15 pages, 5 figures. Version to appear in the "Walter Greiner
Memorial Volume" by World Scientific | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Up to now, Einstein's general theory of relativity has passed all
experimental tests. But yet we know that it is not a fundamental theory and
that it is incompatible with quantum theory. While several extended and
improved gravitational theories on classical and quantum level are nowadays
available, it is a great cha... | [
{
"created": "Tue, 22 Aug 2017 18:00:03 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Nov 2017 22:32:35 GMT",
"version": "v2"
}
] | 2017-11-28 | [
[
"Wondrak",
"Michael Florian",
""
],
[
"Bleicher",
"Marcus",
""
],
[
"Nicolini",
"Piero",
""
]
] | Up to now, Einstein's general theory of relativity has passed all experimental tests. But yet we know that it is not a fundamental theory and that it is incompatible with quantum theory. While several extended and improved gravitational theories on classical and quantum level are nowadays available, it is a great chall... |
0710.1378 | Raymond Chiao Y. | Raymond Y. Chiao | Generation and detection of gravitational waves at microwave frequencies
by means of a superconducting two-body system | 12 pages, 3 figures, 'Time and Matter' conference,10-09a-07 version
with acknowledgments added, and with the mention of linear induction
generator added on page 3, and entangled states on pages 9 and 10 | null | null | null | gr-qc | null | The 2-body system of a superconducting sphere levitated in the magnetic field
generated by a persistent current in a superconducting ring, can possibly
convert gravitational waves into electromagnetic waves, and vice versa.
Faraday's law of induction implies that the time-varying distance between the
sphere and the r... | [
{
"created": "Mon, 8 Oct 2007 08:25:36 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Oct 2007 23:25:29 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2007 23:54:43 GMT",
"version": "v3"
},
{
"created": "Sun, 28 Oct 2007 22:30:04 GMT",
"version": "v4"
}
] | 2007-10-29 | [
[
"Chiao",
"Raymond Y.",
""
]
] | The 2-body system of a superconducting sphere levitated in the magnetic field generated by a persistent current in a superconducting ring, can possibly convert gravitational waves into electromagnetic waves, and vice versa. Faraday's law of induction implies that the time-varying distance between the sphere and the rin... |
2406.02454 | Rajes Ghosh | Rajes Ghosh, Kabir Chakravarti | Parameterized Non-circular Deviation from the Kerr Paradigm and Its
Observational Signatures: Extreme Mass Ratio Inspirals and Lense-Thirring
Effect | Revised version for journal submission, 15 pages, 3 figures, 2 tables | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent gravitational wave observations and shadow imaging have demonstrated
the astonishing consistency of the Kerr paradigm despite all the special
symmetries assumed in deriving the Kerr metric. Hence, it is crucial to test
the presence of these symmetries in astrophysical scenarios and constraint
possible deviatio... | [
{
"created": "Tue, 4 Jun 2024 16:20:14 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jun 2024 08:10:04 GMT",
"version": "v2"
}
] | 2024-06-11 | [
[
"Ghosh",
"Rajes",
""
],
[
"Chakravarti",
"Kabir",
""
]
] | Recent gravitational wave observations and shadow imaging have demonstrated the astonishing consistency of the Kerr paradigm despite all the special symmetries assumed in deriving the Kerr metric. Hence, it is crucial to test the presence of these symmetries in astrophysical scenarios and constraint possible deviations... |
gr-qc/9402004 | null | Giorgio Immirzi | Regge calculus and Ashtekar variables | 10 pages, uses harvmac. DFUPG 83/94 | Class.Quant.Grav.11:1971-1980,1994 | 10.1088/0264-9381/11/8/005 | null | gr-qc | null | Spacetime discretized in simplexes, as proposed in the pioneer work of Regge,
is described in terms of selfdual variables. In particular, we elucidate the
"kinematic" structure of the initial value problem, in which 3--space is
divided into flat tetrahedra, paying particular attention to the role played by
the realit... | [
{
"created": "Wed, 2 Feb 1994 12:38:12 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Immirzi",
"Giorgio",
""
]
] | Spacetime discretized in simplexes, as proposed in the pioneer work of Regge, is described in terms of selfdual variables. In particular, we elucidate the "kinematic" structure of the initial value problem, in which 3--space is divided into flat tetrahedra, paying particular attention to the role played by the reality ... |
2301.02579 | Vaibhav Kalvakota | Vaibhav Kalvakota | Singularities from Hyperentropic regions using the Quantum Expansion | 4 pages, Revtex file | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent paper \cite{Bousso:2022cun} put forward a theorem showing that
hyperentropic surface would result in incomplete null generators for a null
hypersurface emanating from the surface provided it satisfies the null
curvature condition and the spacetime is globally hyperbolic. In this paper, we
will put forward a ... | [
{
"created": "Fri, 6 Jan 2023 16:18:49 GMT",
"version": "v1"
}
] | 2023-01-09 | [
[
"Kalvakota",
"Vaibhav",
""
]
] | A recent paper \cite{Bousso:2022cun} put forward a theorem showing that hyperentropic surface would result in incomplete null generators for a null hypersurface emanating from the surface provided it satisfies the null curvature condition and the spacetime is globally hyperbolic. In this paper, we will put forward a ve... |
2011.10234 | Yasutaka Koga | Yasutaka Koga, Takahisa Igata, Keisuke Nakashi | Photon surfaces in less symmetric spacetimes | 21 pages, no figure | Phys. Rev. D 103, 044003 (2021) | 10.1103/PhysRevD.103.044003 | RUP-20-34; KEK-Cosmo-0268; KEK-TH-2280 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate photon surfaces and their stability in a less symmetric
spacetime, a general static warped product with a warping function acting on a
Riemannian submanifold of codimension two. We find a one-dimensional
pseudopotential that gives photon surfaces as its extrema regardless of the
spatial symmetry of the... | [
{
"created": "Fri, 20 Nov 2020 06:47:09 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Feb 2021 10:03:19 GMT",
"version": "v2"
}
] | 2021-02-10 | [
[
"Koga",
"Yasutaka",
""
],
[
"Igata",
"Takahisa",
""
],
[
"Nakashi",
"Keisuke",
""
]
] | We investigate photon surfaces and their stability in a less symmetric spacetime, a general static warped product with a warping function acting on a Riemannian submanifold of codimension two. We find a one-dimensional pseudopotential that gives photon surfaces as its extrema regardless of the spatial symmetry of the s... |
1207.6055 | Volker Schlue | Volker Schlue | Global results for linear waves on expanding Kerr and Schwarzschild de
Sitter cosmologies | Substantially extended results for Kerr de Sitter backgrounds, and
more general expanding cosmologies without symmetries (Section 5);
applications to Klein-Gordon equations added (Section 7); Introduction
(Section 2.3.2) and references updated; 45 pages, 7 figures | Commun. Math. Phys. 334, 977-1023 (2015) | 10.1007/s00220-014-2154-2 | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this global study of solutions to the linear wave equation on
Schwarzschild de Sitter spacetimes we attend to the cosmological region of
spacetime which is bounded in the past by cosmological horizons and to the
future by a spacelike hypersurface at infinity. We prove an energy estimate
capturing the expansion of ... | [
{
"created": "Wed, 25 Jul 2012 16:57:45 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Nov 2013 20:34:45 GMT",
"version": "v2"
}
] | 2021-08-16 | [
[
"Schlue",
"Volker",
""
]
] | In this global study of solutions to the linear wave equation on Schwarzschild de Sitter spacetimes we attend to the cosmological region of spacetime which is bounded in the past by cosmological horizons and to the future by a spacelike hypersurface at infinity. We prove an energy estimate capturing the expansion of th... |
0905.3492 | Luca Bombelli | Luca Bombelli, Alejandro Corichi, Oliver Winkler | Semiclassical Quantum Gravity: Obtaining Manifolds from Graphs | 16 pages, 5 figures | Class.Quant.Grav.26:245012,2009 | 10.1088/0264-9381/26/24/245012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the "inverse problem" for discrete geometry, which consists in
determining whether, given a discrete structure of a type that does not in
general imply geometrical information or even a topology, one can associate
with it a unique manifold in an appropriate sense, and constructing the
manifold when it exis... | [
{
"created": "Thu, 21 May 2009 14:09:39 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Bombelli",
"Luca",
""
],
[
"Corichi",
"Alejandro",
""
],
[
"Winkler",
"Oliver",
""
]
] | We address the "inverse problem" for discrete geometry, which consists in determining whether, given a discrete structure of a type that does not in general imply geometrical information or even a topology, one can associate with it a unique manifold in an appropriate sense, and constructing the manifold when it exists... |
gr-qc/9509001 | Shiho Kobayashi | Akio Hosoya and Shiho Kobayashi | Anderson Localization in the Sky and Cosmological Magnetic Field | 13 pages, latex, epsfj, 3 figures | Phys.Rev. D54 (1996) 4738-4743 | 10.1103/PhysRevD.54.4738 | TIT/HEP-298/COSMO-57 | gr-qc astro-ph cond-mat | null | We discuss the Anderson localization of electromagnetic fields in the
fluctuating plasma induced by the gravitational density perturbation before the
recombination time of the Universe. Randomly distributed localized coherent
electromagnetic fields emerge in the thermal equilibrium before the
recombination time. We a... | [
{
"created": "Fri, 1 Sep 1995 12:59:18 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Hosoya",
"Akio",
""
],
[
"Kobayashi",
"Shiho",
""
]
] | We discuss the Anderson localization of electromagnetic fields in the fluctuating plasma induced by the gravitational density perturbation before the recombination time of the Universe. Randomly distributed localized coherent electromagnetic fields emerge in the thermal equilibrium before the recombination time. We arg... |
gr-qc/0503048 | Etienne Takou | N. Noutchegueme, D. Dongo and E. Takou | Global existence of solutions for the relativistic Boltzmann equation
with arbitrarily large initial data on a Bianchi type I space-time | 17 pages | Gen.Rel.Grav. 37 (2005) 2047-2062 | 10.1007/s10714-005-0179-8 | null | gr-qc | null | We prove, for the relativistic Boltzmann equation on a Bianchi type I
space-time, a global existence and uniqueness theorem, for arbitrarily large
initial data.
| [
{
"created": "Fri, 11 Mar 2005 09:54:57 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Noutchegueme",
"N.",
""
],
[
"Dongo",
"D.",
""
],
[
"Takou",
"E.",
""
]
] | We prove, for the relativistic Boltzmann equation on a Bianchi type I space-time, a global existence and uniqueness theorem, for arbitrarily large initial data. |
1908.10600 | Jinsong Yang | Jinsong Yang, Yongge Ma | Consistency check on the fundamental and alternative flux operators in
loop quantum gravity | 12 pages, 4 figures; minor updates | Chin. Phys. C 43, 103106 (2019) | 10.1088/1674-1137/43/10/103106 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are different constructions of the flux of triad in loop quantum
gravity, namely the fundamental and alternative flux operators. In parallel to
the consistency check on the two versions of operator by the algebraic calculus
in the literature, we check their consistency by the graphical calculus. Our
calculation... | [
{
"created": "Wed, 28 Aug 2019 08:56:36 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 2019 11:51:35 GMT",
"version": "v2"
}
] | 2019-11-06 | [
[
"Yang",
"Jinsong",
""
],
[
"Ma",
"Yongge",
""
]
] | There are different constructions of the flux of triad in loop quantum gravity, namely the fundamental and alternative flux operators. In parallel to the consistency check on the two versions of operator by the algebraic calculus in the literature, we check their consistency by the graphical calculus. Our calculation b... |
gr-qc/9809081 | Grigori Volovik | G.E. Volovik | Energy-momentum tensor of quasiparticles in the effective gravity in
superfluids | Latex file, 19 pages, discussion is extended and includes the global
and local thermodynamic equilibrium in the presence of event horizon | null | null | null | gr-qc | null | The problem of the energy-momentum conservation for matter in the
gravitational field is discussed on the example of the effective gravity, which
arises in superfluids. The "gravitational" field experienced by the
relativistic-like massless quasiparticles which form the "matter" (phonons in
superfluid 4He and low-ene... | [
{
"created": "Tue, 29 Sep 1998 06:40:36 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 1998 14:30:28 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Oct 1998 06:23:36 GMT",
"version": "v3"
},
{
"created": "Sun, 25 Oct 1998 11:56:25 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Volovik",
"G. E.",
""
]
] | The problem of the energy-momentum conservation for matter in the gravitational field is discussed on the example of the effective gravity, which arises in superfluids. The "gravitational" field experienced by the relativistic-like massless quasiparticles which form the "matter" (phonons in superfluid 4He and low-energ... |
1910.01872 | Xiangdong Zhang | Yunlong Liu and Xiangdong Zhang | Maximal efficiency of the collisional Penrose process with spinning
particles in Kerr-Sen black hole | 20 pages, 17 figures. Published version | Eur. Phys. J. C (2020) 80: 31 | 10.1140/epjc/s10052-019-7605-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the collision of two uncharged spinning particles around an extreme
Kerr-Sen black hole and calculate the maximal efficiency of the energy
extraction from the Kerr-Sen black hole via super Penrose process. We consider
the collision of two massive particles as well as collision of a massless
particle with a m... | [
{
"created": "Fri, 4 Oct 2019 11:12:34 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jan 2020 07:35:11 GMT",
"version": "v2"
}
] | 2020-01-29 | [
[
"Liu",
"Yunlong",
""
],
[
"Zhang",
"Xiangdong",
""
]
] | We study the collision of two uncharged spinning particles around an extreme Kerr-Sen black hole and calculate the maximal efficiency of the energy extraction from the Kerr-Sen black hole via super Penrose process. We consider the collision of two massive particles as well as collision of a massless particle with a mas... |
2106.08679 | Antonio C. Guti\'errez-Pi\~neres | Antonio Calixto Guti\'errez-Pi\~neres and Hernando Quevedo | Darmois matching and $C^3$ matching | Replaced with the version matching the published one in CQG | null | 10.1088/1361-6382/ac45dc | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We apply the Darmois and the $C^3$ matching conditions to three different
spherically symmetric spacetimes. The exterior spacetime is described by the
Schwarzschild vacuum solution whereas for the interior counterpart we choose
different perfect fluid solutions with the same symmetry. We show that Darmois
matching co... | [
{
"created": "Wed, 16 Jun 2021 10:33:14 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 2021 05:01:18 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jan 2022 23:27:24 GMT",
"version": "v3"
}
] | 2022-01-25 | [
[
"Gutiérrez-Piñeres",
"Antonio Calixto",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We apply the Darmois and the $C^3$ matching conditions to three different spherically symmetric spacetimes. The exterior spacetime is described by the Schwarzschild vacuum solution whereas for the interior counterpart we choose different perfect fluid solutions with the same symmetry. We show that Darmois matching cond... |
2406.04525 | Naritaka Oshita | Naritaka Oshita, Kazufumi Takahashi, Shinji Mukohyama | (In)stability of the black hole greybody factors and ringdowns against a
small-bump correction | 14 pages, 4 figures | null | null | YITP-24-69, IPMU24-0025, RIKEN-iTHEMS-Report-24 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Recently, it has been proposed that the black hole greybody factors can be
important to model ringdown spectral amplitudes. We study the stability of
greybody factors against a small-bump correction in the perturbation equation.
We find (I) that the greybody factor is stable in the frequency region relevant
to ringdo... | [
{
"created": "Thu, 6 Jun 2024 21:51:21 GMT",
"version": "v1"
}
] | 2024-06-10 | [
[
"Oshita",
"Naritaka",
""
],
[
"Takahashi",
"Kazufumi",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | Recently, it has been proposed that the black hole greybody factors can be important to model ringdown spectral amplitudes. We study the stability of greybody factors against a small-bump correction in the perturbation equation. We find (I) that the greybody factor is stable in the frequency region relevant to ringdown... |
gr-qc/0310097 | Matt Visser | A. J. M. Medved, Damien Martin, and Matt Visser | Dirty black holes: Quasinormal modes for "squeezed" horizons | 15 pages, uses iopart.cls and setstack.sty V2: Two references added.
Also, the appendix now relates our computation of the Regge-Wheeler potential
for gravity in a generic "dirty" black hole to the results of Karlovini
[gr-qc/0111066] | Class.Quant.Grav. 21 (2004) 2393-2405 | 10.1088/0264-9381/21/9/013 | null | gr-qc hep-th | null | We consider the quasinormal modes for a class of black hole spacetimes that,
informally speaking, contain a closely ``squeezed'' pair of horizons. (This
scenario, where the relevant observer is presumed to be ``trapped'' between the
horizons, is operationally distinct from near-extremal black holes with an
external o... | [
{
"created": "Mon, 20 Oct 2003 01:54:42 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Oct 2003 02:53:40 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Medved",
"A. J. M.",
""
],
[
"Martin",
"Damien",
""
],
[
"Visser",
"Matt",
""
]
] | We consider the quasinormal modes for a class of black hole spacetimes that, informally speaking, contain a closely ``squeezed'' pair of horizons. (This scenario, where the relevant observer is presumed to be ``trapped'' between the horizons, is operationally distinct from near-extremal black holes with an external obs... |
0705.2255 | Mamdouh Wanas | M.I. Wanas | Torsion Energy | 7 pages, LaTeX file | null | null | null | gr-qc hep-th math.DG | null | In the present work, torsion energy is defined. Its law of conservation is
given. It is shown that this type of energy gives rise to a repulsive force
which can be used to interpret supernovae type Ia observations, and
consequently the accelerating expansion of the Universe. This interpretation is
a pure geometric on... | [
{
"created": "Tue, 15 May 2007 23:11:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wanas",
"M. I.",
""
]
] | In the present work, torsion energy is defined. Its law of conservation is given. It is shown that this type of energy gives rise to a repulsive force which can be used to interpret supernovae type Ia observations, and consequently the accelerating expansion of the Universe. This interpretation is a pure geometric one ... |
gr-qc/9610039 | Joa Centrella | Xing Zhuge, Joan M. Centrella, and Stephen L. W. McMillan (Drexel
University) | Gravitational Radiation from the Coalescence of Binary Neutron Stars:
Effects Due to the Equation of State, Spin, and Mass Ratio | 39 pages, uses Latex 2.09. To be published in the Dec. 15, 1996 issue
of Physical Review D. 16 Figures (bitmapped). Originals available in
compressed Postscript format at ftp://zonker.drexel.edu/papers/PAPER2/ | Phys.Rev.D54:7261-7277,1996 | 10.1103/PhysRevD.54.7261 | null | gr-qc astro-ph | null | We calculate the gravitational radiation produced by the coalescence of
inspiraling binary neutron stars in the Newtonian regime using 3-dimensional
numerical simulations. The stars are modeled as polytropes and start out in the
point-mass regime at wide separation. The hydrodynamic integration is performed
using smo... | [
{
"created": "Thu, 17 Oct 1996 17:35:12 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Zhuge",
"Xing",
"",
"Drexel\n University"
],
[
"Centrella",
"Joan M.",
"",
"Drexel\n University"
],
[
"McMillan",
"Stephen L. W.",
"",
"Drexel\n University"
]
] | We calculate the gravitational radiation produced by the coalescence of inspiraling binary neutron stars in the Newtonian regime using 3-dimensional numerical simulations. The stars are modeled as polytropes and start out in the point-mass regime at wide separation. The hydrodynamic integration is performed using smoot... |
1603.01611 | Ratbay Myrzakulov | Aizhan Myrzakul and Ratbay Myrzakulov | On the Hojman conservation quantities in FRW Cosmology | 24 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we investigate the Hojman symmetry in FRW cosmology. In
particular, we use the Hojman symmetry to find conserved quantities of
particular cosmological models. Next, we study the Hojman symmetry in the
scalar-tensor cosmology and find corresponding exact forms of integrals of
motion. Finally, the f... | [
{
"created": "Mon, 7 Mar 2016 17:25:50 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Mar 2016 17:25:25 GMT",
"version": "v2"
}
] | 2016-03-15 | [
[
"Myrzakul",
"Aizhan",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | In the present work we investigate the Hojman symmetry in FRW cosmology. In particular, we use the Hojman symmetry to find conserved quantities of particular cosmological models. Next, we study the Hojman symmetry in the scalar-tensor cosmology and find corresponding exact forms of integrals of motion. Finally, the for... |
gr-qc/0505155 | Marek Szydlowski | Orest Hrycyna and Marek Szydlowski | Different faces of chaos in FRW models with scalar fields -- geometrical
point of view | Revtex4, 10 pages, 16 figures | Chaos Solitons & Fractals 28 (2006) 1252-1270 | 10.1016/j.chaos.2005.08.187 | null | gr-qc | null | FRW cosmologies with conformally coupled scalar fields are investigated in a
geometrical way by the means of geodesics of the Jacobi metric. In this model
of dynamics, trajectories in the configuration space are represented by
geodesics. Because of the singular nature of the Jacobi metric on the boundary
set $\partia... | [
{
"created": "Tue, 31 May 2005 06:59:15 GMT",
"version": "v1"
}
] | 2007-06-14 | [
[
"Hrycyna",
"Orest",
""
],
[
"Szydlowski",
"Marek",
""
]
] | FRW cosmologies with conformally coupled scalar fields are investigated in a geometrical way by the means of geodesics of the Jacobi metric. In this model of dynamics, trajectories in the configuration space are represented by geodesics. Because of the singular nature of the Jacobi metric on the boundary set $\partial\... |
1110.4185 | Sandipan Sengupta | Sandipan Sengupta | SU(2) gauge theory of gravity with topological invariants | Based on a talk at Loops-11, Madrid, Spain; To appear in Journal of
Physics: Conference Series | 2012 J. Phys.: Conf. Ser. 360 012024 | 10.1088/1742-6596/360/1/012024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most general gravity Lagrangian in four dimensions contains three
topological densities, namely Nieh-Yan, Pontryagin and Euler, in addition to
the Hilbert-Palatini term. We set up a Hamiltonian formulation based on this
Lagrangian. The resulting canonical theory depends on three parameters which
are coefficients ... | [
{
"created": "Wed, 19 Oct 2011 05:26:29 GMT",
"version": "v1"
}
] | 2012-06-01 | [
[
"Sengupta",
"Sandipan",
""
]
] | The most general gravity Lagrangian in four dimensions contains three topological densities, namely Nieh-Yan, Pontryagin and Euler, in addition to the Hilbert-Palatini term. We set up a Hamiltonian formulation based on this Lagrangian. The resulting canonical theory depends on three parameters which are coefficients of... |
gr-qc/0002005 | D. V. Ahluwalia | D. V. Ahluwalia | Wave-Particle duality at the Planck scale: Freezing of neutrino
oscillations | Published version | Phys.Lett.A275:31-35,2000 | 10.1016/S0375-9601(00)00578-8 | EdeFUAZ/ISGBG-02 | gr-qc astro-ph hep-ph hep-th quant-ph | null | A gravitationally-induced modification to de Broglie wave-particle duality is
presented. At Planck scale, the gravitationally-modified matter wavelength
saturates to a few times the Planck length in a momentum independent manner. In
certain frameworks, this circumstance freezes neutrino oscillations in the
Planck rea... | [
{
"created": "Tue, 1 Feb 2000 22:29:32 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2000 18:53:42 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Dec 2000 19:16:57 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Ahluwalia",
"D. V.",
""
]
] | A gravitationally-induced modification to de Broglie wave-particle duality is presented. At Planck scale, the gravitationally-modified matter wavelength saturates to a few times the Planck length in a momentum independent manner. In certain frameworks, this circumstance freezes neutrino oscillations in the Planck realm... |
gr-qc/9411053 | Haret Rosu | H.C. Rosu | Remarks on the frequency spectra of some fundamental quantum effects | 6 pages, LaTex | Nuovo Cimento B 114 (January 1999) 107-112 | null | null | gr-qc quant-ph | null | Short remarks on the problem of assigning frequency spectra to Casimir,
sonoluminescence, Hawking, Unruh, and quantum optical squeezing effects are
presented
| [
{
"created": "Mon, 21 Nov 1994 03:15:00 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 1997 17:53:57 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Apr 1999 15:46:32 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Rosu",
"H. C.",
""
]
] | Short remarks on the problem of assigning frequency spectra to Casimir, sonoluminescence, Hawking, Unruh, and quantum optical squeezing effects are presented |
0812.4033 | Claudio Dappiaggi | Claudio Dappiaggi, Valter Moretti, Nicola Pinamonti | Distinguished quantum states in a class of cosmological spacetimes and
their Hadamard property | 41 pages | null | 10.1063/1.3122770 | Desy 08-199, ESI 2088, UTM 726, ZMP-HH/08-21 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, we proved that a large class of spacetimes, not
necessarily homogeneous or isotropous and relevant at a cosmological level,
possesses a preferred codimension one submanifold, i.e., the past cosmological
horizon, on which it is possible to encode the information of a scalar field
theory living in th... | [
{
"created": "Sun, 21 Dec 2008 17:46:23 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Dappiaggi",
"Claudio",
""
],
[
"Moretti",
"Valter",
""
],
[
"Pinamonti",
"Nicola",
""
]
] | In a recent paper, we proved that a large class of spacetimes, not necessarily homogeneous or isotropous and relevant at a cosmological level, possesses a preferred codimension one submanifold, i.e., the past cosmological horizon, on which it is possible to encode the information of a scalar field theory living in the ... |
2004.14863 | Nihan Kat{\i}rc{\i} | Ozgur Akarsu, Nihan Katirci, Anjan A. Sen, J. Alberto Vazquez | Scalar field emulator via anisotropically deformed vacuum energy:
Application to dark energy | 7 pages, 1 figure, 2 tables | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a generalization of the usual vacuum energy, called `deformed
vacuum energy', which yields anisotropic pressure whilst preserving zero
inertial mass density. It couples to the shear scalar in a unique way, such
that they together emulate the canonical scalar field with an arbitrary
potential. This opens ... | [
{
"created": "Wed, 29 Apr 2020 15:48:13 GMT",
"version": "v1"
}
] | 2020-05-01 | [
[
"Akarsu",
"Ozgur",
""
],
[
"Katirci",
"Nihan",
""
],
[
"Sen",
"Anjan A.",
""
],
[
"Vazquez",
"J. Alberto",
""
]
] | We introduce a generalization of the usual vacuum energy, called `deformed vacuum energy', which yields anisotropic pressure whilst preserving zero inertial mass density. It couples to the shear scalar in a unique way, such that they together emulate the canonical scalar field with an arbitrary potential. This opens up... |
1905.00834 | Francisco Linares | Francisco X. Linares Cede\~no, Ariadna Montiel, Juan Carlos Hidalgo,
Gabriel Germ\'an | Bayesian evidence for $\alpha$-attractor dark energy models | 18 pages, 3 figures, 6 tables. Final version accepted for publication
in JCAP | null | 10.1088/1475-7516/2019/08/002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark energy models with tracker properties have gained attention due to the
large range of initial conditions leading to the current value of the dark
energy density parameter. A well-motivated family of these models are the
so-called $\alpha$-attractors, which show the late time behavior of a
cosmological constant. ... | [
{
"created": "Thu, 2 May 2019 16:20:28 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jul 2019 13:45:44 GMT",
"version": "v2"
}
] | 2019-08-07 | [
[
"Cedeño",
"Francisco X. Linares",
""
],
[
"Montiel",
"Ariadna",
""
],
[
"Hidalgo",
"Juan Carlos",
""
],
[
"Germán",
"Gabriel",
""
]
] | Dark energy models with tracker properties have gained attention due to the large range of initial conditions leading to the current value of the dark energy density parameter. A well-motivated family of these models are the so-called $\alpha$-attractors, which show the late time behavior of a cosmological constant. In... |
gr-qc/9612058 | Alexandre Filippov | A.T.Filippov (JINR, Dubna, Russia) | Integrable 1+1 dimensional gravity models | 10 pages, Latex; submitted to Proc. of the International Workshop
`Classical and Quantum Integrable Systems', Dubna, July 1996; to be published
in Intern. Journ. Mod. Phys. A | Int.J.Mod.Phys.A12:13-22,1997 | 10.1142/S0217751X97000037 | null | gr-qc | null | Integrable models of dilaton gravity coupled to electromagnetic and scalar
matter fields in dimensions 1+1 and 0+1 are briefly reviewed. The 1+1
dimensional integrable models are either solved in terms of explicit
quadratures or reduced to the classically integrable Liouville equation. The
0+1 dimensional integrable ... | [
{
"created": "Fri, 20 Dec 1996 12:46:32 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Filippov",
"A. T.",
"",
"JINR, Dubna, Russia"
]
] | Integrable models of dilaton gravity coupled to electromagnetic and scalar matter fields in dimensions 1+1 and 0+1 are briefly reviewed. The 1+1 dimensional integrable models are either solved in terms of explicit quadratures or reduced to the classically integrable Liouville equation. The 0+1 dimensional integrable mo... |
gr-qc/0109090 | Ramin G. Daghigh | R. G. Daghigh and J. I. Kapusta | High Temperature Matter and Gamma Ray Spectra from Microscopic Black
Holes | 33 pages, 13 figures, to be submitted to PRD | Phys.Rev. D65 (2002) 064028 | 10.1103/PhysRevD.65.064028 | null | gr-qc astro-ph | null | The relativistic viscous fluid equations describing the outflow of high
temperature matter created via Hawking radiation from microscopic black holes
are solved numerically for a realistic equation of state. We focus on black
holes with initial temperatures greater than 100 GeV and lifetimes less than 6
days. The spe... | [
{
"created": "Thu, 27 Sep 2001 18:38:00 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Daghigh",
"R. G.",
""
],
[
"Kapusta",
"J. I.",
""
]
] | The relativistic viscous fluid equations describing the outflow of high temperature matter created via Hawking radiation from microscopic black holes are solved numerically for a realistic equation of state. We focus on black holes with initial temperatures greater than 100 GeV and lifetimes less than 6 days. The spect... |
1503.03240 | Norman G\"urlebeck | Norman G\"urlebeck | No-hair theorem for Black Holes in Astrophysical Environments | 5 pages, to appear in Phys. Rev. Lett | null | 10.1103/PhysRevLett.114.151102 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the no-hair theorem, static black holes are described by a
Schwarzschild spacetime provided there are no other sources of the
gravitational field. This requirement, however, is in astrophysical realistic
scenarios often violated, e.g., if the black hole is part of a binary system or
if it is surrounded b... | [
{
"created": "Wed, 11 Mar 2015 09:40:25 GMT",
"version": "v1"
}
] | 2015-06-24 | [
[
"Gürlebeck",
"Norman",
""
]
] | According to the no-hair theorem, static black holes are described by a Schwarzschild spacetime provided there are no other sources of the gravitational field. This requirement, however, is in astrophysical realistic scenarios often violated, e.g., if the black hole is part of a binary system or if it is surrounded by ... |
gr-qc/0603105 | Brien C. Nolan | Brien C. Nolan | Bounds for scalar waves on self-similar naked-singularity backgrounds | 16 pages, 1 figure. Published version | Class.Quant.Grav. 23 (2006) 4523-4538 | 10.1088/0264-9381/23/13/015 | null | gr-qc | null | The stability of naked singularities in self-similar collapse is probed using
scalar waves. It is shown that the multipoles of a minimally coupled massless
scalar field propagating on a spherically symmetric self-similar background
spacetime admitting a naked singularity maintain finite $L^2$ norm as they
impinge on ... | [
{
"created": "Tue, 28 Mar 2006 11:39:58 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2006 08:55:06 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Jun 2006 08:15:23 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Nolan",
"Brien C.",
""
]
] | The stability of naked singularities in self-similar collapse is probed using scalar waves. It is shown that the multipoles of a minimally coupled massless scalar field propagating on a spherically symmetric self-similar background spacetime admitting a naked singularity maintain finite $L^2$ norm as they impinge on th... |
1407.8529 | Jose Manuel Torres | Miguel Alcubierre and Jose M. Torres | Constraint preserving boundary conditions for the
Baumgarte-Shapiro-Shibata-Nakamura formulation in spherical symmetry | 15 pages, 12 figures, to be published in Classical and Quantum
Gravity | null | 10.1088/0264-9381/32/3/035006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a set of constraint preserving boundary conditions for the
Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation of the Einstein evolution
equations in spherical symmetry, based on its hyperbolic structure. While the
outgoing eigenfields are left to propagate freely off the numerical grid,
boundary condi... | [
{
"created": "Thu, 31 Jul 2014 18:59:30 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 2014 18:40:04 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Torres",
"Jose M.",
""
]
] | We introduce a set of constraint preserving boundary conditions for the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation of the Einstein evolution equations in spherical symmetry, based on its hyperbolic structure. While the outgoing eigenfields are left to propagate freely off the numerical grid, boundary conditi... |
1701.06899 | Adel Awad | Adel Awad and Gamal Nashed | Generalized teleparallel cosmology and initial singularity crossing | added few references and corrected some typos | null | 10.1088/1475-7516/2017/02/046 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of cosmological solutions for a generalized teleparallel
gravity with, $f(T)=T+\tilde{\alpha}(-T)^n$, where $\tilde{\alpha}$ is some
parameter and $n$ is an integer or half-integer. Choosing $\tilde{\alpha} \sim
G^{n-1}$, where $G$ is the gravitational constant, and working with an equation
of stat... | [
{
"created": "Thu, 19 Jan 2017 17:39:34 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Feb 2017 00:01:22 GMT",
"version": "v2"
}
] | 2017-03-08 | [
[
"Awad",
"Adel",
""
],
[
"Nashed",
"Gamal",
""
]
] | We present a class of cosmological solutions for a generalized teleparallel gravity with, $f(T)=T+\tilde{\alpha}(-T)^n$, where $\tilde{\alpha}$ is some parameter and $n$ is an integer or half-integer. Choosing $\tilde{\alpha} \sim G^{n-1}$, where $G$ is the gravitational constant, and working with an equation of state ... |
1205.0733 | Edward Wilson-Ewing | Carlo Rovelli, Edward Wilson-Ewing | Discrete Symmetries in Covariant LQG | 8 pages, v2: Minor changes | Phys.Rev.D86:064002,2012 | 10.1103/PhysRevD.86.064002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study time-reversal and parity ---on the physical manifold and in internal
space--- in covariant loop gravity. We consider a minor modification of the
Holst action which makes it transform coherently under such transformations.
The classical theory is not affected but the quantum theory is slightly
different. In p... | [
{
"created": "Thu, 3 May 2012 15:19:24 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2012 13:05:01 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Rovelli",
"Carlo",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | We study time-reversal and parity ---on the physical manifold and in internal space--- in covariant loop gravity. We consider a minor modification of the Holst action which makes it transform coherently under such transformations. The classical theory is not affected but the quantum theory is slightly different. In par... |
1511.08645 | Eduardo Guendelman I | Eduardo I. Guendelman and Ramon Herrera | Curvaton reheating in a Scale Invariant Two Measures Theory | 26 pages, published in Gen.Rel.Grav. arXiv admin note: text overlap
with arXiv:1408.5344 | Gen.Rel.Grav. 48:3 (2016) | 10.1007/s10714-015-1999-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The curvaton reheating mechanism in a Scale Invariant Two Measures Theory
defined in terms of two independent non-Riemannian volume forms (alternative
generally covariant integration measure densities) on the space-time manifold
which are metric independent is studied. The model involves two scalar matter
fields, a d... | [
{
"created": "Fri, 27 Nov 2015 12:35:23 GMT",
"version": "v1"
}
] | 2015-11-30 | [
[
"Guendelman",
"Eduardo I.",
""
],
[
"Herrera",
"Ramon",
""
]
] | The curvaton reheating mechanism in a Scale Invariant Two Measures Theory defined in terms of two independent non-Riemannian volume forms (alternative generally covariant integration measure densities) on the space-time manifold which are metric independent is studied. The model involves two scalar matter fields, a dil... |
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