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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2103.16428 | Benoit Charbonneau | Sepehr Rashidi, C. G. Hewitt, Benoit Charbonneau | Dynamical Equilibrium States of a Class of Irrotational Non-Orthogonally
Transitive $G_{2}$ Cosmologies II: Models With One Hypersurface-Orthogonal
Killing Vector Field | Only change is reference to companion paper arxiv:2103.16431 added | null | 10.1088/1361-6382/ac0bc0 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of inhomogeneous self-similar cosmological models in
which the perfect fluid flow is tangential to the orbits of a three-parameter
similarity group. We restrict the similarity group to possess both an Abelian
$G_{2}$, and a single hypersurface orthogonal Killing vector field, and we
restrict the f... | [
{
"created": "Tue, 30 Mar 2021 15:23:39 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Mar 2021 01:38:36 GMT",
"version": "v2"
}
] | 2021-08-11 | [
[
"Rashidi",
"Sepehr",
""
],
[
"Hewitt",
"C. G.",
""
],
[
"Charbonneau",
"Benoit",
""
]
] | We consider a class of inhomogeneous self-similar cosmological models in which the perfect fluid flow is tangential to the orbits of a three-parameter similarity group. We restrict the similarity group to possess both an Abelian $G_{2}$, and a single hypersurface orthogonal Killing vector field, and we restrict the flu... |
1907.12792 | Dipanjan Dey | Dipanjan Dey, Prashant Kocherlakota, Pankaj S. Joshi | A General Relativistic Approach to Small-Scale Structure Formation | 16 pages, 3 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We treat here general relativistically the issue of galaxy formation, which
is a major problem in cosmology. While the current models use a top-hat
collapse model, coupled with Newtonian virialization technique to balance the
gravitationally collapsing matter cloud into a galaxy, we present here a
general relativisti... | [
{
"created": "Tue, 30 Jul 2019 09:07:34 GMT",
"version": "v1"
}
] | 2019-07-31 | [
[
"Dey",
"Dipanjan",
""
],
[
"Kocherlakota",
"Prashant",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We treat here general relativistically the issue of galaxy formation, which is a major problem in cosmology. While the current models use a top-hat collapse model, coupled with Newtonian virialization technique to balance the gravitationally collapsing matter cloud into a galaxy, we present here a general relativistic ... |
1205.6662 | Christos Tsagas | J. D. Barrow, C. G. Tsagas and K. Yamamoto | Origin of cosmic magnetic fields: Superadiabatically amplified modes in
open Friedmann universes | Typos corrected, references added. PRD in press | Phys.Rev.D86:023533,2012 | 10.1103/PhysRevD.86.023533 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological magnetic fields in open Friedmann universes can experience
superadiabatic amplification within the realm of conventional electromagnetism.
This is possible mathematically, despite the conformal invariance of Maxwell's
equations, because Friedmann spacetimes with non-Euclidean spatial geometry are
not glo... | [
{
"created": "Wed, 30 May 2012 13:18:21 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2012 14:26:31 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Jul 2012 19:30:53 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Barrow",
"J. D.",
""
],
[
"Tsagas",
"C. G.",
""
],
[
"Yamamoto",
"K.",
""
]
] | Cosmological magnetic fields in open Friedmann universes can experience superadiabatic amplification within the realm of conventional electromagnetism. This is possible mathematically, despite the conformal invariance of Maxwell's equations, because Friedmann spacetimes with non-Euclidean spatial geometry are not globa... |
1305.3531 | Eugen Radu | Yves Brihaye and Eugen Radu | Black hole solutions in d=5 Chern-Simons gravity | 34 pages, 3 figures | null | 10.1007/JHEP11(2013)049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The five dimensional Einstein-Gauss-Bonnet gravity with a negative
cosmological constant becomes, for a special value of the Gauss-Bonnet coupling
constant, a Chern-Simons (CS) theory of gravity. In this work we discuss the
properties of several different types of black object solutions of this model.
Special attenti... | [
{
"created": "Wed, 15 May 2013 16:17:48 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2013 11:19:02 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Brihaye",
"Yves",
""
],
[
"Radu",
"Eugen",
""
]
] | The five dimensional Einstein-Gauss-Bonnet gravity with a negative cosmological constant becomes, for a special value of the Gauss-Bonnet coupling constant, a Chern-Simons (CS) theory of gravity. In this work we discuss the properties of several different types of black object solutions of this model. Special attention... |
1505.06683 | Jonathan Engle | Jonathan Engle, Ilya Vilensky, and Antonia Zipfel | The Lorentzian proper vertex amplitude: Asymptotics | 32 pages; argument in section IV clarified and improved | Phys. Rev. D 94, 064025 (2016) | 10.1103/PhysRevD.94.064025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous work, the Lorentzian proper vertex amplitude for a spin-foam
model of quantum gravity was derived. In the present work, the asymptotics of
this amplitude are studied in the semi-classical limit. The starting point of
the analysis is an expression for the amplitude as an action integral with
action differi... | [
{
"created": "Mon, 25 May 2015 16:35:43 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2016 12:22:06 GMT",
"version": "v2"
}
] | 2016-09-14 | [
[
"Engle",
"Jonathan",
""
],
[
"Vilensky",
"Ilya",
""
],
[
"Zipfel",
"Antonia",
""
]
] | In previous work, the Lorentzian proper vertex amplitude for a spin-foam model of quantum gravity was derived. In the present work, the asymptotics of this amplitude are studied in the semi-classical limit. The starting point of the analysis is an expression for the amplitude as an action integral with action differing... |
0811.3253 | Arturo Avelino Huerta | Arturo Avelino and Ulises Nucamendi (University of Michoacan, Mexico) | Can a matter-dominated model with constant bulk viscosity drive the
accelerated expansion of the universe? | 31 pages, 12 figures and 2 tables. Accepted to be published in the
Journal of Cosmology and Astroparticle Physics. Analysis using the new SCP
"Union" SNe Ia dataset instead of the Gold 2006 and ESSENCE datasets and
without changes in the conclusions. Added references. Related works:
arXiv:0801.1686 and arXiv:08... | JCAP 0904:006,2009 | 10.1088/1475-7516/2009/04/006 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We test a cosmological model which the only component is a pressureless fluid
with a constant bulk viscosity as an explanation for the present accelerated
expansion of the universe. We classify all the possible scenarios for the
universe predicted by the model according to their past, present and future
evolution and... | [
{
"created": "Thu, 20 Nov 2008 03:21:33 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2009 01:24:21 GMT",
"version": "v2"
}
] | 2009-04-17 | [
[
"Avelino",
"Arturo",
"",
"University of Michoacan, Mexico"
],
[
"Nucamendi",
"Ulises",
"",
"University of Michoacan, Mexico"
]
] | We test a cosmological model which the only component is a pressureless fluid with a constant bulk viscosity as an explanation for the present accelerated expansion of the universe. We classify all the possible scenarios for the universe predicted by the model according to their past, present and future evolution and w... |
1712.01545 | Shao-Wen Wei | Bin Liang, Shao-Wen Wei, Yu-Xiao Liu | Quasinormal Modes and Van der Waals like phase transition of charged AdS
black holes in Lorentz symmetry breaking massive gravity | 12 pages, 10 figures, and 2 tables | Int. J. Mod. Phys. D 28, 1950113 (2019) | 10.1142/S021827181950113X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the quasinormal modes of a massless scalar perturbation, we investigate
the small/large black hole phase transition in the Lorentz symmetry breaking
massive gravity. We mainly focus on two issues: i) the sign change of slope of
the quasinormal mode frequencies in the complex-$\omega$ diagram; ii) the
behaviors ... | [
{
"created": "Tue, 5 Dec 2017 09:48:47 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2019 21:33:22 GMT",
"version": "v2"
}
] | 2019-06-11 | [
[
"Liang",
"Bin",
""
],
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Using the quasinormal modes of a massless scalar perturbation, we investigate the small/large black hole phase transition in the Lorentz symmetry breaking massive gravity. We mainly focus on two issues: i) the sign change of slope of the quasinormal mode frequencies in the complex-$\omega$ diagram; ii) the behaviors of... |
2408.08289 | Fatemeh Aliyan | Fateme Aliyan and Kourosh Nozari | Shadow behavior of an EMSG charged black hole | 16 pages, 8 figures, 2 tables | Published in Physics of the Dark Universe 5 August 2024 | 10.1016/j.dark.2024.101611 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent shadow images of Sgr A and M87 captured by Event Horizon Telescope
(EHT) collaboration confirms the existence of black holes or their possible
alternatives in the center of galaxies. On the other hand, the new image of Sgr
A in polarized light suggests a Magnetic field spiraling at the Edge of the
Milky Way Ce... | [
{
"created": "Thu, 15 Aug 2024 17:43:09 GMT",
"version": "v1"
}
] | 2024-08-16 | [
[
"Aliyan",
"Fateme",
""
],
[
"Nozari",
"Kourosh",
""
]
] | Recent shadow images of Sgr A and M87 captured by Event Horizon Telescope (EHT) collaboration confirms the existence of black holes or their possible alternatives in the center of galaxies. On the other hand, the new image of Sgr A in polarized light suggests a Magnetic field spiraling at the Edge of the Milky Way Cent... |
1702.06949 | Kostya Trachenko | K. Trachenko | Stable equilibrium point and oscillatory motion of the Universe in a
model with variable vacuum energy | null | Physical Review D 95, 043522 (2017) | 10.1103/PhysRevD.95.043522 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the mechanism by which the field vacuum energy varies as a result
of strong self-interaction. We propose a non-perturbative approach to treat
strong interactions and discuss the problem in terms of quasi-particles
describing the motion of field modes. The resulting vacuum energy is variable
and depends on ... | [
{
"created": "Wed, 22 Feb 2017 16:32:14 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Trachenko",
"K.",
""
]
] | We discuss the mechanism by which the field vacuum energy varies as a result of strong self-interaction. We propose a non-perturbative approach to treat strong interactions and discuss the problem in terms of quasi-particles describing the motion of field modes. The resulting vacuum energy is variable and depends on th... |
gr-qc/0409025 | S. M. Blinder | S. M. Blinder | Minkowski electromagnetic analog for Kerr-Newman electrovac solution | LaTeX manuscript 8 pages 0 figures | null | null | null | gr-qc | null | An electromagnetic analog of the Kerr-Newman solution in general relativity
is derived, based on Minkowski's formulation for electromagnetic fields in
moving media. The equivalent system is a distribution of charges and currents
largely localized within a spinning disk of radius a. This occurs in a rotating
medium of... | [
{
"created": "Mon, 6 Sep 2004 14:59:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blinder",
"S. M.",
""
]
] | An electromagnetic analog of the Kerr-Newman solution in general relativity is derived, based on Minkowski's formulation for electromagnetic fields in moving media. The equivalent system is a distribution of charges and currents largely localized within a spinning disk of radius a. This occurs in a rotating medium of i... |
2109.11701 | Jerome Quintin | Chandrima Ganguly, Jerome Quintin | Microphysical manifestations of viscosity and consequences for
anisotropies in the very early universe | 24 pages, 3 figures; v2: typos corrected, clarifications and
references added; v3: more clarifications and references added, matches
published version | Phys. Rev. D 105, 023532 (2022) | 10.1103/PhysRevD.105.023532 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been known that a non-perfect fluid that accounts for dissipative
viscous effects can evade a highly anisotropic chaotic mixmaster approach to a
singularity. Viscosity is often simply parameterised in this context, so it
remains unclear whether isotropisation can really occur in physically motivated
contexts. ... | [
{
"created": "Fri, 24 Sep 2021 01:10:25 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2021 17:00:59 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Jan 2022 19:24:57 GMT",
"version": "v3"
}
] | 2022-02-02 | [
[
"Ganguly",
"Chandrima",
""
],
[
"Quintin",
"Jerome",
""
]
] | It has been known that a non-perfect fluid that accounts for dissipative viscous effects can evade a highly anisotropic chaotic mixmaster approach to a singularity. Viscosity is often simply parameterised in this context, so it remains unclear whether isotropisation can really occur in physically motivated contexts. We... |
2001.03465 | Joan Sola | Spyros Basilakos, Nick E. Mavromatos and Joan Sola | Quantum Anomalies in String-Inspired Running Vacuum Universe: Inflation
and Axion Dark Matter | Accepted for publication in Phys. Lett. B. Extended discussion,
references added | Physics Letters B 803 (2020) 135342 | 10.1016/j.physletb.2020.135342 | KCL-PH-TH/2019-2019-89 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we elaborate further on a Cosmological "Running-Vacuum" type
model for the Universe, suggested previously by the authors within the context
of a string-inspired effective theory in the presence of a Kalb-Ramond (KR)
gravitational axion field which descends from the antisymmetric tensor of the
massless... | [
{
"created": "Thu, 9 Jan 2020 18:05:02 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Feb 2020 19:38:13 GMT",
"version": "v2"
}
] | 2020-03-10 | [
[
"Basilakos",
"Spyros",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"Sola",
"Joan",
""
]
] | In this letter, we elaborate further on a Cosmological "Running-Vacuum" type model for the Universe, suggested previously by the authors within the context of a string-inspired effective theory in the presence of a Kalb-Ramond (KR) gravitational axion field which descends from the antisymmetric tensor of the massless g... |
2201.11667 | Rajendra Gupta | Rajendra P Gupta | Varying Coupling Constants and Their Interdependence | 6 pages. This version has been corrected for the error in the
variation of the Planck constant | Modern Physics Letters A 37, 2250155 (2022) | 10.1142/S0217732322501553 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since Dirac predicted in 1937 possible variation of gravitational constant
and other coupling constants from his large number hypothesis, efforts continue
to determine such variation without success. Such efforts focus on the
variation of one constant while assuming all others pegged to their currently
measured value... | [
{
"created": "Tue, 25 Jan 2022 20:33:49 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Apr 2022 19:17:40 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Aug 2022 19:19:57 GMT",
"version": "v3"
},
{
"created": "Wed, 21 Jun 2023 21:52:41 GMT",
"version": "v4"
}
] | 2023-06-23 | [
[
"Gupta",
"Rajendra P",
""
]
] | Since Dirac predicted in 1937 possible variation of gravitational constant and other coupling constants from his large number hypothesis, efforts continue to determine such variation without success. Such efforts focus on the variation of one constant while assuming all others pegged to their currently measured values.... |
2308.12378 | Francesco Iacovelli | Francesco Iacovelli, Michele Mancarella, Chiranjib Mondal, Anna
Puecher, Tim Dietrich, Francesca Gulminelli, Michele Maggiore, Micaela Oertel | Nuclear physics constraints from binary neutron star mergers in the
Einstein Telescope era | 18 pages, 10 figures. v2 matches the version accepted for publication
in PRD | null | 10.1103/PhysRevD.108.122006 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The next generation of ground-based gravitational-wave detectors, Einstein
Telescope (ET) and Cosmic Explorer (CE), present a unique opportunity to put
constraints on dense matter, among many other groundbreaking scientific goals.
In a recent study the science case of ET was further strengthened, studying in
particul... | [
{
"created": "Tue, 22 Aug 2023 16:36:37 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Nov 2023 11:25:00 GMT",
"version": "v2"
}
] | 2023-12-18 | [
[
"Iacovelli",
"Francesco",
""
],
[
"Mancarella",
"Michele",
""
],
[
"Mondal",
"Chiranjib",
""
],
[
"Puecher",
"Anna",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Gulminelli",
"Francesca",
""
],
[
"Maggiore",
"Michele",
... | The next generation of ground-based gravitational-wave detectors, Einstein Telescope (ET) and Cosmic Explorer (CE), present a unique opportunity to put constraints on dense matter, among many other groundbreaking scientific goals. In a recent study the science case of ET was further strengthened, studying in particular... |
gr-qc/9912041 | Dr Mayeul Arminjon | Mayeul Arminjon | Post-Newtonian Approximation of a Scalar Theory of Gravitation and
Application to Light Rays | HTML, 17 pages, no figure.Accepted (Summer 1996) for publication in
Rev. Roum. Sci. Tech. - Mec. Appl.. Apart from reference 22 (added) and note
2 (modified), this text dates back to May 1996 | Rev.Roum.Sci.Tech.Ser.Mec.Appl. 43 (1998) 135-153 | null | null | gr-qc | null | A scalar, preferred-frame theory of gravitation is summarized. Space-time is
endowed with both a flat metric and a curved, "physical" metric. Motion is
governed by a natural extension of Newton's second law, which implies geodesic
motion only for a static field. The theory predicts Schwarzschild's exterior
metric in ... | [
{
"created": "Fri, 10 Dec 1999 15:15:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arminjon",
"Mayeul",
""
]
] | A scalar, preferred-frame theory of gravitation is summarized. Space-time is endowed with both a flat metric and a curved, "physical" metric. Motion is governed by a natural extension of Newton's second law, which implies geodesic motion only for a static field. The theory predicts Schwarzschild's exterior metric in th... |
2104.10433 | Zbigniew Haba | Z. Haba | Quantum state evolution in an environment of cosmological perturbations | 34 pages | Universe, 7,117(2021) | 10.3390/universe7050117 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the pure and thermal states of quantized scalar and tensor
perturbations in various epochs of Universe evolution. We calculate the density
matrix of non-relativistic particles in an environment of these perturbations.
We show that particle's motion can be described by a stochastic equation with a
noise comin... | [
{
"created": "Wed, 21 Apr 2021 09:55:04 GMT",
"version": "v1"
}
] | 2021-04-23 | [
[
"Haba",
"Z.",
""
]
] | We study the pure and thermal states of quantized scalar and tensor perturbations in various epochs of Universe evolution. We calculate the density matrix of non-relativistic particles in an environment of these perturbations. We show that particle's motion can be described by a stochastic equation with a noise coming ... |
gr-qc/0702061 | Hamid Reza Sepangi | M. Heydari-Fard and H. R. Sepangi | Gauss-Bonnet brane gravity with a confining potential | 14 pages, 4 figures, to appear in PRD | Phys.Rev.D75:064010,2007 | 10.1103/PhysRevD.75.064010 | null | gr-qc hep-th | null | A brane scenario is envisaged in which the $m$-dimensional bulk is endowed
with a Gauss-Bonnet term and localization of matter on the brane is achieved by
means of a confining potential. The resulting Friedmann equations on the brane
are modified by various extra terms that may be interpreted as the X-matter,
providi... | [
{
"created": "Sat, 10 Feb 2007 06:47:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Heydari-Fard",
"M.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | A brane scenario is envisaged in which the $m$-dimensional bulk is endowed with a Gauss-Bonnet term and localization of matter on the brane is achieved by means of a confining potential. The resulting Friedmann equations on the brane are modified by various extra terms that may be interpreted as the X-matter, providing... |
gr-qc/9703083 | null | Jacek Jezierski | Bondi mass in classical field theory | 51 pages, LaTeX | Acta Physica Polonica B 29 (1998) 667-743 | null | null | gr-qc | null | We analyze three classical field theories based on the wave equation: scalar
field, electrodynamics and linearized gravity. We derive certain generating
formula on a hyperboloid and on a null surface for them. The linearized
Einstein equations are analyzed around null infinity. It is shown how the
dynamics can be red... | [
{
"created": "Thu, 27 Mar 1997 12:17:22 GMT",
"version": "v1"
}
] | 2013-11-12 | [
[
"Jezierski",
"Jacek",
""
]
] | We analyze three classical field theories based on the wave equation: scalar field, electrodynamics and linearized gravity. We derive certain generating formula on a hyperboloid and on a null surface for them. The linearized Einstein equations are analyzed around null infinity. It is shown how the dynamics can be reduc... |
gr-qc/9909089 | Marc Mars | Marc Mars | 3+1 description of silent universes: a uniqueness result for the Petrov
type I vacuum case | 21 pages, no figures, LaTeX | Class.Quant.Grav. 16 (1999) 3245-3262 | 10.1088/0264-9381/16/10/315 | null | gr-qc | null | Silent universes are studied using a ``3+1'' decomposition of the field
equations in order to make progress in proving a recent conjecture that the
only silent universes of Petrov type I are spatially homogeneous Bianchi I
models. The infinite set of constraints are written in a geometrically clear
form as an infinit... | [
{
"created": "Wed, 29 Sep 1999 15:37:59 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mars",
"Marc",
""
]
] | Silent universes are studied using a ``3+1'' decomposition of the field equations in order to make progress in proving a recent conjecture that the only silent universes of Petrov type I are spatially homogeneous Bianchi I models. The infinite set of constraints are written in a geometrically clear form as an infinite ... |
1301.4633 | Abdallah Al Zahrani M. | A. M. Al Zahrani, Valeri P. Frolov and Andrey A. Shoom | Critical escape velocity for a charged particle moving around a weakly
magnetized Schwarzschild black hole | 12 pages | null | 10.1103/PhysRevD.87.084043 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss charged particles motion in a spacetime of a weakly magnetized
static non-rotating black hole. We study under which conditions a charged
particle originally revolving around the black hole at a circular orbit after
being kicked by another particle or photon can escape to infinity. We determine
the escape v... | [
{
"created": "Sun, 20 Jan 2013 06:58:07 GMT",
"version": "v1"
}
] | 2016-11-04 | [
[
"Zahrani",
"A. M. Al",
""
],
[
"Frolov",
"Valeri P.",
""
],
[
"Shoom",
"Andrey A.",
""
]
] | We discuss charged particles motion in a spacetime of a weakly magnetized static non-rotating black hole. We study under which conditions a charged particle originally revolving around the black hole at a circular orbit after being kicked by another particle or photon can escape to infinity. We determine the escape vel... |
2107.06646 | Kyriakos Papadopoulos | Kyriakos Papadopoulos | Natural vs. Artificial Topologies on a Relativistic Spacetime | null | null | 10.1007/978-3-030-61732-5_18 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Consider a set $M$ equipped with a structure $*$. We call a natural topology
$T_*$, on $(M,*)$, the topology induced by $*$. For example, a natural topology
for a metric space $(X,d)$ is a topology $T_d$ induced by the metric $d$ and
for a linearly ordered set $(X,<)$ a natural topology should be the topology
$T_<$ t... | [
{
"created": "Mon, 12 Jul 2021 11:39:58 GMT",
"version": "v1"
}
] | 2021-07-15 | [
[
"Papadopoulos",
"Kyriakos",
""
]
] | Consider a set $M$ equipped with a structure $*$. We call a natural topology $T_*$, on $(M,*)$, the topology induced by $*$. For example, a natural topology for a metric space $(X,d)$ is a topology $T_d$ induced by the metric $d$ and for a linearly ordered set $(X,<)$ a natural topology should be the topology $T_<$ tha... |
1608.06970 | David Garfinkle | Ratindranath Akhoury, David Garfinkle and Nishant Gupta | White holes in Einstein-aether theory | 25 pages, 15 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform numerical simulations of gravitational collapse in Einstein-aether
theory. We find that under certain conditions, the collapse results in the
temporary formation of a white hole horizon.
| [
{
"created": "Wed, 24 Aug 2016 21:16:29 GMT",
"version": "v1"
}
] | 2016-08-26 | [
[
"Akhoury",
"Ratindranath",
""
],
[
"Garfinkle",
"David",
""
],
[
"Gupta",
"Nishant",
""
]
] | We perform numerical simulations of gravitational collapse in Einstein-aether theory. We find that under certain conditions, the collapse results in the temporary formation of a white hole horizon. |
1007.2594 | William Donnelly | William Donnelly and Ted Jacobson | Coupling the inflaton to an expanding aether | 13 pages. v2: matches PRD version | Phys.Rev.D82:064032,2010 | 10.1103/PhysRevD.82.064032 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a Lorentz-violating theory of inflation consisting of
Einstein-aether theory with a scalar inflaton coupled bilinearly to the
expansion of the aether. We determine the conditions for linearized stability,
positive energy, and vanishing of preferred-frame post-Newtonian parameters,
and find that all these ... | [
{
"created": "Thu, 15 Jul 2010 15:45:21 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2012 20:14:30 GMT",
"version": "v2"
}
] | 2012-01-17 | [
[
"Donnelly",
"William",
""
],
[
"Jacobson",
"Ted",
""
]
] | We consider a Lorentz-violating theory of inflation consisting of Einstein-aether theory with a scalar inflaton coupled bilinearly to the expansion of the aether. We determine the conditions for linearized stability, positive energy, and vanishing of preferred-frame post-Newtonian parameters, and find that all these co... |
1911.06608 | Rohan Kulkarni | Rohan Kulkarni | Black holes, Singularity theorems and The Global structure of Spacetime | 119 pages, 32 figures. arXiv admin note: text overlap with
arXiv:gr-qc/0009013, arXiv:1410.5226 by other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is an extensive literature review focusing on a few of the
important topics in the large-scale structure of spacetime. The work is a
Bachelor's thesis submitted at the Institute of Theoretical Physics, University
of Leipzig.
The author starts the thesis by deriving the Schwarzchild metric, Reissner
Nordst... | [
{
"created": "Fri, 8 Nov 2019 22:46:02 GMT",
"version": "v1"
}
] | 2019-11-18 | [
[
"Kulkarni",
"Rohan",
""
]
] | This work is an extensive literature review focusing on a few of the important topics in the large-scale structure of spacetime. The work is a Bachelor's thesis submitted at the Institute of Theoretical Physics, University of Leipzig. The author starts the thesis by deriving the Schwarzchild metric, Reissner Nordstorm ... |
2210.03902 | Yan Peng | Yan Peng | Analytical investigations on non-minimally coupled scalar fields outside
neutral reflecting shells | 8 pages | null | 10.1140/epjc/s10052-023-11310-7 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the existence of scalar fields outside neutral reflecting shells. We
consider static massive scalar fields non-minimally coupled to the Gauss-Bonnet
invariant. We analytically investigated properties of scalar fields through the
scalar field equation. In the small scalar field mass regime, we derive a
compac... | [
{
"created": "Sat, 8 Oct 2022 03:51:20 GMT",
"version": "v1"
}
] | 2023-03-01 | [
[
"Peng",
"Yan",
""
]
] | We study the existence of scalar fields outside neutral reflecting shells. We consider static massive scalar fields non-minimally coupled to the Gauss-Bonnet invariant. We analytically investigated properties of scalar fields through the scalar field equation. In the small scalar field mass regime, we derive a compact ... |
gr-qc/9306022 | null | J. Gamboa and Y. Georgelin | The No-Hair Conjecture in 2D Dilaton Supergravity | Plain Tex, 19pp, IPNO-TH 93/25 | Phys.Rev. D48 (1993) 4713-4719 | 10.1103/PhysRevD.48.4713 | null | gr-qc hep-th | null | We study two dimensional dilaton gravity and supergravity following
hamiltonian methods. Firstly, we consider the structure of constraints of 2D
dilaton gravity and then the 2D dilaton supergravity is obtained taking the
squere root of the bosonic constraints. We integrate exactly the equations of
motion in both case... | [
{
"created": "Thu, 17 Jun 1993 17:24:38 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Gamboa",
"J.",
""
],
[
"Georgelin",
"Y.",
""
]
] | We study two dimensional dilaton gravity and supergravity following hamiltonian methods. Firstly, we consider the structure of constraints of 2D dilaton gravity and then the 2D dilaton supergravity is obtained taking the squere root of the bosonic constraints. We integrate exactly the equations of motion in both cases ... |
gr-qc/0205114 | Claude Barrabes | C. Barrabes and P. A. Hogan | Recoil and Ring--Down Effects in Gravitation | 13 pages LaTeX no figures | International Journal of Theoretical Physics, Group Theory and
Nonlinear Optics (2002) | null | null | gr-qc | null | We construct a model of a relativistic fireball or light--like shell of
matter by considering a spherically symmetric moving gravitating mass
experiencing an impulsive deceleration to rest. We take this event to be
followed by the mass undergoing a deformation leading to the emission of
gravitational radiation while ... | [
{
"created": "Tue, 28 May 2002 13:16:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barrabes",
"C.",
""
],
[
"Hogan",
"P. A.",
""
]
] | We construct a model of a relativistic fireball or light--like shell of matter by considering a spherically symmetric moving gravitating mass experiencing an impulsive deceleration to rest. We take this event to be followed by the mass undergoing a deformation leading to the emission of gravitational radiation while it... |
2308.10399 | Robert Nesbet | R. K. Nesbet | Conformal theory of gravitation and cosmic expansion | 8 pages. arXiv admin note: text overlap with arXiv:2112.10770 | MDPI Symmetry Vol. 16, 0003 (2024) | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The postulate of universal Weyl conformal symmetry for all elementary
physical fields introduces nonclassical gravitational effects in both conformal
gravitation(CG) and the conformal Higgs model (CHM). The resulting theory is
found to explain major observed phenomena including excessive galactic rotation
velocities ... | [
{
"created": "Mon, 21 Aug 2023 00:25:55 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Dec 2023 23:12:06 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Nesbet",
"R. K.",
""
]
] | The postulate of universal Weyl conformal symmetry for all elementary physical fields introduces nonclassical gravitational effects in both conformal gravitation(CG) and the conformal Higgs model (CHM). The resulting theory is found to explain major observed phenomena including excessive galactic rotation velocities an... |
0708.0373 | Chad Middleton | Keith Andrew, Brett Bolen, and Chad A. Middleton | Solutions of Higher Dimensional Gauss-Bonnet FRW Cosmology | 10 pages, references added/corrected, accepted for publication in
General Relativity and Gravitation | Gen.Rel.Grav.39:2061-2071,2007 | 10.1007/s10714-007-0502-7 | null | gr-qc hep-th | null | We examine the effect on cosmological evolution of adding a Gauss-Bonnet term
to the standard Einstein-Hilbert action for a (1 + 3)+ d dimensional
Friedman-Robertson-Walker (FRW) metric. By assuming that the additional
dimensions compactify as a power law as the usual 3 spatial dimensions expand,
we solve the resulti... | [
{
"created": "Thu, 2 Aug 2007 16:19:21 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Aug 2007 17:00:23 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Andrew",
"Keith",
""
],
[
"Bolen",
"Brett",
""
],
[
"Middleton",
"Chad A.",
""
]
] | We examine the effect on cosmological evolution of adding a Gauss-Bonnet term to the standard Einstein-Hilbert action for a (1 + 3)+ d dimensional Friedman-Robertson-Walker (FRW) metric. By assuming that the additional dimensions compactify as a power law as the usual 3 spatial dimensions expand, we solve the resulting... |
gr-qc/9903097 | Mark D. Roberts | Mark D. Roberts | The Quantization of Geodesic Deviation | 9 pages, no diagrams, no tables, LaTex2e | Gen.Rel.Grav.28:1385-1392,1996 | 10.1007/BF02109528 | null | gr-qc hep-th quant-ph | null | There exists a two parameter action, the variation of which produces both the
geodesic equation and the geodesic deviation equation. In this paper it is
shown that this action can be quantized by the canonical method, resulting in
equations which generalize the Klein-Gordon equation. The resulting equations
might hav... | [
{
"created": "Sat, 27 Mar 1999 14:39:00 GMT",
"version": "v1"
}
] | 2011-04-04 | [
[
"Roberts",
"Mark D.",
""
]
] | There exists a two parameter action, the variation of which produces both the geodesic equation and the geodesic deviation equation. In this paper it is shown that this action can be quantized by the canonical method, resulting in equations which generalize the Klein-Gordon equation. The resulting equations might have ... |
1212.2898 | Alex Harvey | Alex Harvey | A Simple Continuous Parametrization of the Kasner Indices | 7 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A parametrization of the Kasner indices in terms of a continuous parameter is
constructed by exploiting their representation as trilinear coordinates. This
provides a clear picture of their variation through their entire range vis a
vis each other. The parameter can be expressed as a function of time.
| [
{
"created": "Wed, 12 Dec 2012 17:37:15 GMT",
"version": "v1"
}
] | 2012-12-13 | [
[
"Harvey",
"Alex",
""
]
] | A parametrization of the Kasner indices in terms of a continuous parameter is constructed by exploiting their representation as trilinear coordinates. This provides a clear picture of their variation through their entire range vis a vis each other. The parameter can be expressed as a function of time. |
2111.03992 | Avi Vajpeyi | Avi Vajpeyi, Eric Thrane, Rory Smith, Barry McKernan, K.E. Saavik Ford | Measuring the properties of active galactic nuclei disks with
gravitational waves | 10 pages, 4 figures | The Astrophysical Journal, Volume 931, Issue 2, id.82, 8 pp., June
2022 | 10.3847/1538-4357/ac6180 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Active galactic nuclei (AGN) are promising environments for the assembly of
merging binary black hole (BBH) systems. Interest in AGNs as nurseries for
merging BBH is rising following the detection of gravitational waves from a BBH
system from the purported pair-instability mass gap, most notably, GW190521.
Active gal... | [
{
"created": "Sun, 7 Nov 2021 03:26:12 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Mar 2023 00:26:07 GMT",
"version": "v2"
}
] | 2023-03-06 | [
[
"Vajpeyi",
"Avi",
""
],
[
"Thrane",
"Eric",
""
],
[
"Smith",
"Rory",
""
],
[
"McKernan",
"Barry",
""
],
[
"Ford",
"K. E. Saavik",
""
]
] | Active galactic nuclei (AGN) are promising environments for the assembly of merging binary black hole (BBH) systems. Interest in AGNs as nurseries for merging BBH is rising following the detection of gravitational waves from a BBH system from the purported pair-instability mass gap, most notably, GW190521. Active galac... |
1208.4645 | Pierre Binetruy | Pierre Binetruy | Vacuum energy, holography and a quantum portrait of the visible Universe | 9 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Describing the presently observable Universe as a self-sustained condensate
of gravitons of size $H_0^{-1}$, with large occupation number $N$, we argue
that the most probable value for the quantum vacuum energy is of the order of
the critical energy density, as observed.
| [
{
"created": "Wed, 22 Aug 2012 23:49:07 GMT",
"version": "v1"
}
] | 2012-08-24 | [
[
"Binetruy",
"Pierre",
""
]
] | Describing the presently observable Universe as a self-sustained condensate of gravitons of size $H_0^{-1}$, with large occupation number $N$, we argue that the most probable value for the quantum vacuum energy is of the order of the critical energy density, as observed. |
0809.1004 | Sayan Chakrabarti | Sayan K. Chakrabarti | A comparative study of Dirac quasinormal modes of charged black holes in
higher dimensions | 21 pages, several eps figures, change in title, corrections made in
the discussion of \alpha going to zero limit, some references added, version
to appear in Eur. Phys. J. C | Eur.Phys.J.C61:477-488,2009 | 10.1140/epjc/s10052-009-1026-y | SINP-TNP/08-17 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the Dirac quasinormal modes of higher dimensional
charged black holes. Higher dimensional Reissner-N\"{o}rdstrom type black holes
as well as charged black holes in Einstein Gauss-Bonnet theories are studied
for Fermionic perturbations using WKB method. A comparative study of the
quasinormal mode... | [
{
"created": "Fri, 5 Sep 2008 11:02:13 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2009 07:41:26 GMT",
"version": "v2"
}
] | 2009-07-09 | [
[
"Chakrabarti",
"Sayan K.",
""
]
] | In this work we study the Dirac quasinormal modes of higher dimensional charged black holes. Higher dimensional Reissner-N\"{o}rdstrom type black holes as well as charged black holes in Einstein Gauss-Bonnet theories are studied for Fermionic perturbations using WKB method. A comparative study of the quasinormal modes ... |
gr-qc/0001024 | Gennadii Varzugin | G. G. Varzugin | The inverse scattering method for cylindrical gravitational waves | 11 pages, LaTeX, no figures, discussion added, some misprints
corrected | null | null | null | gr-qc | null | The initial-value problem for cylindrical gravitational waves is studied
through the development of the inverse scattering method scheme. The inverse
scattering transform in this case can be viewed as a transformation of the
Cauchy data to the data on the symmetry axis. Riemann-Hilbert problem, which
serves as invers... | [
{
"created": "Mon, 10 Jan 2000 22:25:54 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 2000 13:27:30 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Varzugin",
"G. G.",
""
]
] | The initial-value problem for cylindrical gravitational waves is studied through the development of the inverse scattering method scheme. The inverse scattering transform in this case can be viewed as a transformation of the Cauchy data to the data on the symmetry axis. Riemann-Hilbert problem, which serves as inverse ... |
1408.2713 | Domenico Giulini J.W. | Michael Fennen and Domenico Giulini | An exact static two-mass solution using Nariai spacetime | 24 pages, 7 figures | Classical and Quantum Gravity, year 2015 , volume 32, article
number 045008 | 10.1088/0264-9381/32/4/045008 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show the existence of static, spherically symmetric spacetimes containing
two stars of incompressible matter, possibly oppositely charged. The stars are
held apart by the negative pressure of a positive cosmological constant but
there is no cosmological horizon separating them. The spacetime between the
stars is g... | [
{
"created": "Tue, 12 Aug 2014 13:52:59 GMT",
"version": "v1"
}
] | 2015-05-29 | [
[
"Fennen",
"Michael",
""
],
[
"Giulini",
"Domenico",
""
]
] | We show the existence of static, spherically symmetric spacetimes containing two stars of incompressible matter, possibly oppositely charged. The stars are held apart by the negative pressure of a positive cosmological constant but there is no cosmological horizon separating them. The spacetime between the stars is giv... |
2209.01310 | Bei Zhou | Bei Zhou, Luca Reali, Emanuele Berti, Mesut \c{C}al{\i}\c{s}kan, Cyril
Creque-Sarbinowski, Marc Kamionkowski, B. S. Sathyaprakash | Subtracting Compact Binary Foregrounds to Search for Subdominant
Gravitational-Wave Backgrounds in Next-Generation Ground-Based Observatories | 19 pages, 10 figures, matches the published version | null | 10.1103/PhysRevD.108.064040 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stochastic gravitational-wave backgrounds (SGWBs) derive from the
superposition of numerous individually unresolved gravitational-wave (GW)
signals. Detecting SGWBs provides us with invaluable information about
astrophysics, cosmology, and fundamental physics. In this paper, we study SGWBs
from binary black-hole (BBH... | [
{
"created": "Sat, 3 Sep 2022 01:49:42 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Sep 2023 18:45:43 GMT",
"version": "v2"
}
] | 2023-09-26 | [
[
"Zhou",
"Bei",
""
],
[
"Reali",
"Luca",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Çalışkan",
"Mesut",
""
],
[
"Creque-Sarbinowski",
"Cyril",
""
],
[
"Kamionkowski",
"Marc",
""
],
[
"Sathyaprakash",
"B. S.",
""
... | Stochastic gravitational-wave backgrounds (SGWBs) derive from the superposition of numerous individually unresolved gravitational-wave (GW) signals. Detecting SGWBs provides us with invaluable information about astrophysics, cosmology, and fundamental physics. In this paper, we study SGWBs from binary black-hole (BBH) ... |
2305.05674 | Leonardo S\'anchez Hern\'andez | Leonardo S\'an. Hern\'andez, Tonatiuh Matos | Proca Stars with Dark Photons from Spontaneous Symmetry Breaking of the
Scalar Field Dark Matter | 12 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the Scalar Field Dark Matter (SFDM) model (also known as Fuzzy,
Wave, Bose-Einstein, Ultra-light Dark Matter) has gained a lot of attention
because it has provided simpler and more natural explanations for various
phenomena observed in galaxies, as a natural explanation for the center of
galaxies, the numbe... | [
{
"created": "Tue, 9 May 2023 09:42:21 GMT",
"version": "v1"
}
] | 2023-05-11 | [
[
"Hernández",
"Leonardo Sán.",
""
],
[
"Matos",
"Tonatiuh",
""
]
] | Recently, the Scalar Field Dark Matter (SFDM) model (also known as Fuzzy, Wave, Bose-Einstein, Ultra-light Dark Matter) has gained a lot of attention because it has provided simpler and more natural explanations for various phenomena observed in galaxies, as a natural explanation for the center of galaxies, the number ... |
gr-qc/9910056 | Linux User Rhs | O. Bertolami and P.J. Martins | Nonminimal coupling and quintessence | Typos and references corrected. Version to appear in the Physical
Review D | Phys.Rev. D61 (2000) 064007 | 10.1103/PhysRevD.61.064007 | DF/IST-2.99, NYU-TH/99/05/03 | gr-qc astro-ph hep-ph | null | Recent studies of Type Ia Supernovae with redshifts up to about $z~\laq~1$
reveal evidence for a cosmic acceleration in the expansion of the Universe. The
most straightforward explanation to account for this acceleration is a
cosmological constant dominating the recent history of our Universe; however, a
more interes... | [
{
"created": "Fri, 15 Oct 1999 14:10:16 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jan 2000 13:43:21 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Bertolami",
"O.",
""
],
[
"Martins",
"P. J.",
""
]
] | Recent studies of Type Ia Supernovae with redshifts up to about $z~\laq~1$ reveal evidence for a cosmic acceleration in the expansion of the Universe. The most straightforward explanation to account for this acceleration is a cosmological constant dominating the recent history of our Universe; however, a more interesti... |
1302.3445 | Mohammad Malekjani | M. Malekjani, M. Honari-Jafarpour | G-corrected holographic dark energy model | arXiv admin note: text overlap with arXiv:1209.1089 | Astrophys Space Sci. (2013) 346, 545-552 | 10.1007/s10509-013-1475-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we investigate the holographic dark energy model in the framework of FRW
cosmology where the Newtonian gravitational constant,$G$, is varying with
cosmic time. Using the complementary astronomical data which support the time
dependency of $G$, the evolutionary treatment of EoS parameter and energy
density of dar... | [
{
"created": "Wed, 13 Feb 2013 07:28:06 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2013 11:49:08 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Malekjani",
"M.",
""
],
[
"Honari-Jafarpour",
"M.",
""
]
] | Here we investigate the holographic dark energy model in the framework of FRW cosmology where the Newtonian gravitational constant,$G$, is varying with cosmic time. Using the complementary astronomical data which support the time dependency of $G$, the evolutionary treatment of EoS parameter and energy density of dark ... |
1012.5230 | Lorenzo Sebastiani | Lorenzo Sebastiani and Sergio Zerbini | Static Spherically Symmetric Solutions in F(R) Gravity | 8 pages, published version, some references added, a minor
modification | Eur.Phys.J. C71 (2011) 1591 | 10.1140/epjc/s10052-011-1591-8 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Lagrangian derivation of the Equation of Motion (EOM) for static
spherically symmetric metrics in F(R) modified gravity is presented. For a
large class of metrics, our approach permits to reduce the EOM to a single
equation and we show how it is possible to construct exact solutions in
$F(R)$-gravity. All known exa... | [
{
"created": "Thu, 23 Dec 2010 15:20:04 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Dec 2010 14:10:50 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Feb 2011 16:18:13 GMT",
"version": "v3"
}
] | 2015-09-21 | [
[
"Sebastiani",
"Lorenzo",
""
],
[
"Zerbini",
"Sergio",
""
]
] | A Lagrangian derivation of the Equation of Motion (EOM) for static spherically symmetric metrics in F(R) modified gravity is presented. For a large class of metrics, our approach permits to reduce the EOM to a single equation and we show how it is possible to construct exact solutions in $F(R)$-gravity. All known exact... |
gr-qc/0511010 | Saibal Ray | Saibal Ray | Electromagnetic Mass in $(n+2)$ Dimensional Space-times | 4 Latex pages in Revtex4 style | Int.J.Mod.Phys. D15 (2006) 917-924 | 10.1142/S021827180600867X | null | gr-qc | null | Einstein-Maxwell field equations correspoding to higher dimensional
description of static spherically symmetric space-time have been solved under
two specific set of conditions, viz., (i) $\rho \ne 0$, $\nu^\prime= 0$ and
(ii) $\rho=0$, $ \nu^\prime\ne 0$ where $\rho$ and $\nu$ represent the mass
density and metric p... | [
{
"created": "Wed, 2 Nov 2005 18:01:49 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ray",
"Saibal",
""
]
] | Einstein-Maxwell field equations correspoding to higher dimensional description of static spherically symmetric space-time have been solved under two specific set of conditions, viz., (i) $\rho \ne 0$, $\nu^\prime= 0$ and (ii) $\rho=0$, $ \nu^\prime\ne 0$ where $\rho$ and $\nu$ represent the mass density and metric pot... |
gr-qc/9812047 | Heller Michal | M. Heller (Vatican Observatory), W Sasin (Institute of Mathematics,
Warsaw University of Technology) | Origin of Classical Singularities | 19 pages, latex, no figures | Gen.Rel.Grav. 31 (1999) 555 | 10.1023/A:1026650424098 | CGC-98-21 | gr-qc | null | We briefly review some results concerning the problem of classical
singularities in general relativity, obtained with the help of the theory of
differential spaces. In this theory one studies a given space in terms of
functional algebras defined on it. Then we present a generalization of this
method consisting in cha... | [
{
"created": "Mon, 14 Dec 1998 17:21:10 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Heller",
"M.",
"",
"Vatican Observatory"
],
[
"Sasin",
"W",
"",
"Institute of Mathematics,\n Warsaw University of Technology"
]
] | We briefly review some results concerning the problem of classical singularities in general relativity, obtained with the help of the theory of differential spaces. In this theory one studies a given space in terms of functional algebras defined on it. Then we present a generalization of this method consisting in chang... |
0911.5045 | Raul Horvat | R. Horvat | Holographic constraint and effective field theories with N-species | 7 pages, version to appear in JHEP | JHEP 1007:092,2010 | 10.1007/JHEP07(2010)092 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effective field theories that manifest UV/IR mode mixing in such a way as to
be valid for arbitrarily large volumes, can be used for gravitational,
non-black hole events to be accounted for. In formulating such theories with a
large number of particle species $N$, we employ constraints from the muon
$g-2$, higher-dim... | [
{
"created": "Thu, 26 Nov 2009 13:25:34 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2010 08:39:00 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Horvat",
"R.",
""
]
] | Effective field theories that manifest UV/IR mode mixing in such a way as to be valid for arbitrarily large volumes, can be used for gravitational, non-black hole events to be accounted for. In formulating such theories with a large number of particle species $N$, we employ constraints from the muon $g-2$, higher-dimen... |
2102.00095 | Miko{\l}aj Korzy\'nski | Miko{\l}aj Korzy\'nski, Jan Mi\'skiewicz, Julius Serbenta | Weighing the spacetime along the line of sight using times of arrival of
electromagnetic signals | 65 pages, 5 figures. Major revision, App. A and G added, corrections
throughout the text | Phys. Rev. D 104, 024026 (2021) | 10.1103/PhysRevD.104.024026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new method of measuring the mass density along the line of
sight, based on precise measurements of the variations of the times of arrival
(TOA's) of electromagnetic signals propagating between two distant regions of
spacetime. The TOA variations are measured between a number of slightly
displaced pairs o... | [
{
"created": "Fri, 29 Jan 2021 22:35:30 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2021 16:55:34 GMT",
"version": "v2"
}
] | 2021-07-14 | [
[
"Korzyński",
"Mikołaj",
""
],
[
"Miśkiewicz",
"Jan",
""
],
[
"Serbenta",
"Julius",
""
]
] | We present a new method of measuring the mass density along the line of sight, based on precise measurements of the variations of the times of arrival (TOA's) of electromagnetic signals propagating between two distant regions of spacetime. The TOA variations are measured between a number of slightly displaced pairs of ... |
1104.5562 | Ali Kaya | Ali Kaya and Merve Tarman | Stress-Energy Tensor of Adiabatic Vacuum in Friedmann-Robertson-Walker
Spacetimes | 15 pages, revtex4 | JCAP 04 (2011) 040 | 10.1088/1475-7516/2011/04/040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the leading order contribution to the stress-energy tensor
corresponding to the modes of a quantum scalar field propagating in a
Friedmann-Robertson-Walker universe with arbitrary coupling to the scalar
curvature, whose exact mode functions can be expanded as an infinite adiabatic
series. While for a massi... | [
{
"created": "Fri, 29 Apr 2011 07:38:10 GMT",
"version": "v1"
}
] | 2011-05-02 | [
[
"Kaya",
"Ali",
""
],
[
"Tarman",
"Merve",
""
]
] | We compute the leading order contribution to the stress-energy tensor corresponding to the modes of a quantum scalar field propagating in a Friedmann-Robertson-Walker universe with arbitrary coupling to the scalar curvature, whose exact mode functions can be expanded as an infinite adiabatic series. While for a massive... |
2005.06358 | Luis Herrera | L. Herrera | Stability of the isotropic pressure condition | 10 pages Revtex. Published in Phys. Rev. D | Phys. Rev. D 101, 104024 (2020) | 10.1103/PhysRevD.101.104024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the conditions for the (in)stability of the isotropic pressure
condition in collapsing spherically symmetric, dissipative fluid distributions.
It is found that dissipative fluxes, and/or energy density inhomogeneities
and/or the appearance of shear in the fluid flow, force any initially isotropic
confi... | [
{
"created": "Wed, 13 May 2020 15:06:05 GMT",
"version": "v1"
}
] | 2020-05-27 | [
[
"Herrera",
"L.",
""
]
] | We investigate the conditions for the (in)stability of the isotropic pressure condition in collapsing spherically symmetric, dissipative fluid distributions. It is found that dissipative fluxes, and/or energy density inhomogeneities and/or the appearance of shear in the fluid flow, force any initially isotropic configu... |
2302.04520 | Luis Herrera | L. Herrera, A. Di Prisco, J. Ospino | Expansion-free dissipative fluid spheres: Analytical models | 12 pages Latex. arXiv admin note: text overlap with arXiv:2206.02143.
Typos corrected. Published in Symmetry (Special Issue Symmetry in Cosmology
and Gravity: Topic and Advance) | Symmetry, 15, 754, (2023) | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We search exact analytical solutions of spherically symmetric dissipative
fluid distributions satisfying the vanishing expansion condition (vanishing
expansion scalar $\Theta$). To do so we shall impose additional restrictions
allowing the integration of the field equations. A detailed analysis of the
obtained soluti... | [
{
"created": "Thu, 9 Feb 2023 09:27:35 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Mar 2023 16:57:55 GMT",
"version": "v2"
}
] | 2023-03-21 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Ospino",
"J.",
""
]
] | We search exact analytical solutions of spherically symmetric dissipative fluid distributions satisfying the vanishing expansion condition (vanishing expansion scalar $\Theta$). To do so we shall impose additional restrictions allowing the integration of the field equations. A detailed analysis of the obtained solution... |
0804.0492 | Alicia M. Sintes | Miquel Trias and Alicia M. Sintes | LISA parameter estimation of supermassive black holes | Final version, 12th GWDAW (Gravitational Wave Data Analysis Workshop) | Class.Quant.Grav.25:184032,2008 | 10.1088/0264-9381/25/18/184032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study parameter estimation of supermassive black holes in the range
$10^5-10^8\Ms$ by LISA using the inspiral full post-Newtonian gravitational
waveforms, and we compare the results with those arising from the commonly used
restricted post-Newtonian approximation. The analysis shows that for
observations of the la... | [
{
"created": "Thu, 3 Apr 2008 07:56:44 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Feb 2009 13:55:15 GMT",
"version": "v2"
}
] | 2009-02-27 | [
[
"Trias",
"Miquel",
""
],
[
"Sintes",
"Alicia M.",
""
]
] | We study parameter estimation of supermassive black holes in the range $10^5-10^8\Ms$ by LISA using the inspiral full post-Newtonian gravitational waveforms, and we compare the results with those arising from the commonly used restricted post-Newtonian approximation. The analysis shows that for observations of the last... |
2207.04501 | Phongpichit Channuie | Daris Samart (Khon Kaen U.), Natthason Autthisin (Khon Kaen U.),
Phongpichit Channuie (Walailak U.) | Gravitational lensing by traversable wormholes supported by three-form
fields | v1: 16 pages, 4 figures | Annalen Phys. 535 (2023) 2300039 | 10.1002/andp.202300039 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study the deflection angle of light by traversable
wormholes, which are supported by the three-form fields. The specific forms of
the redshift and shape functions that produce results compatible with the
energy conditions at throat of the wormholes are used. Having used the
well-defined parameter se... | [
{
"created": "Sun, 10 Jul 2022 16:34:28 GMT",
"version": "v1"
}
] | 2023-11-14 | [
[
"Samart",
"Daris",
"",
"Khon Kaen U."
],
[
"Autthisin",
"Natthason",
"",
"Khon Kaen U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
]
] | In this paper, we study the deflection angle of light by traversable wormholes, which are supported by the three-form fields. The specific forms of the redshift and shape functions that produce results compatible with the energy conditions at throat of the wormholes are used. Having used the well-defined parameter sets... |
gr-qc/0407086 | Peter D'Eath | A.N.St.J.Farley and P.D.D'Eath (Department of Applied Mathematics and
Theoretical Physics, University of Cambridge) | Scalar--Field Amplitudes in Black--Hole Evaporation | Submitted to Physics Letters B, Friday 23rd July 2004 | Phys.Lett. B601 (2004) 184-191 | 10.1016/j.physletb.2004.09.004 | null | gr-qc | null | We study the quantum-mechanical decay of a Schwarzschild-like black hole into
almost-flat space and weak radiation at a very late time, evaluating quantum
amplitudes (not just probabilities) for transitions from initial to final
states. No information is lost. The model contains gravity and a massless
scalar field. T... | [
{
"created": "Fri, 23 Jul 2004 15:34:46 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2005 14:41:02 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Farley",
"A. N. St. J.",
"",
"Department of Applied Mathematics and\n Theoretical Physics, University of Cambridge"
],
[
"D'Eath",
"P. D.",
"",
"Department of Applied Mathematics and\n Theoretical Physics, University of Cambridge"
]
] | We study the quantum-mechanical decay of a Schwarzschild-like black hole into almost-flat space and weak radiation at a very late time, evaluating quantum amplitudes (not just probabilities) for transitions from initial to final states. No information is lost. The model contains gravity and a massless scalar field. The... |
2201.01616 | Jorge Pullin | Rodolfo Gambini, Javier Olmedo, Jorge Pullin | Towards a quantum notion of covariance in spherically symmetric loop
quantum gravity | 8 pages, RevTex, no figures. To appear in Physical Review D | Physical Review D 105 (2022) 2, 026017 | 10.1103/PhysRevD.105.026017 | LSU-REL-010522 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The covariance of loop quantum gravity studies of spherically symmetric
space-times has recently been questioned. This is a reasonable worry, given
that they are formulated in terms of slicing-dependent variables. We show
explicitly that the resulting space-times, obtained from Dirac observables of
the quantum theory... | [
{
"created": "Wed, 5 Jan 2022 13:52:40 GMT",
"version": "v1"
}
] | 2022-02-21 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Olmedo",
"Javier",
""
],
[
"Pullin",
"Jorge",
""
]
] | The covariance of loop quantum gravity studies of spherically symmetric space-times has recently been questioned. This is a reasonable worry, given that they are formulated in terms of slicing-dependent variables. We show explicitly that the resulting space-times, obtained from Dirac observables of the quantum theory, ... |
gr-qc/9501016 | John Baez | John Baez, Javier P. Muniain, and Dardo Piriz | Quantum Gravity Hamiltonian for Manifolds with Boundary | 17 pages in LaTeX format, vastly improved version | Phys.Rev. D52 (1995) 6840-6845 | 10.1103/PhysRevD.52.6840 | null | gr-qc | null | In canonical quantum gravity, when space is a compact manifold with boundary
there is a Hamiltonian given by an integral over the boundary. Here we compute
the action of this `boundary Hamiltonian' on observables corresponding to open
Wilson lines in the new variables formulation of quantum gravity. In cases
where th... | [
{
"created": "Mon, 16 Jan 1995 16:50:30 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 1995 17:10:57 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Baez",
"John",
""
],
[
"Muniain",
"Javier P.",
""
],
[
"Piriz",
"Dardo",
""
]
] | In canonical quantum gravity, when space is a compact manifold with boundary there is a Hamiltonian given by an integral over the boundary. Here we compute the action of this `boundary Hamiltonian' on observables corresponding to open Wilson lines in the new variables formulation of quantum gravity. In cases where the ... |
1102.5560 | James Reid | James A. Reid and Charles H.-T. Wang | The Configuration Space of Conformal Connection-Dynamics | null | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The configuration space of the reduced Hamiltonian formulation of quantum
gravity has been shown, for non-Ricci flat metrics, to be a higher-dimensional
analogue of the Teichm\"{u}ller space of conformal structures on a Riemann
surface. In this article we show that the configuration space of conformal
connection-dyna... | [
{
"created": "Sun, 27 Feb 2011 23:17:46 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2012 11:42:27 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Aug 2012 19:07:31 GMT",
"version": "v3"
}
] | 2012-08-21 | [
[
"Reid",
"James A.",
""
],
[
"Wang",
"Charles H. -T.",
""
]
] | The configuration space of the reduced Hamiltonian formulation of quantum gravity has been shown, for non-Ricci flat metrics, to be a higher-dimensional analogue of the Teichm\"{u}ller space of conformal structures on a Riemann surface. In this article we show that the configuration space of conformal connection-dynami... |
1901.09696 | Carlos Villalpando | Carlos Villalpando, Sujoy K. Modak | Indirect Probe of Quantum Gravity using Molecular Wave-packets | 13 pages, 2 figures, to appear in Class. Quant. Grav | Class. Quantum Grav. 36, 215016 (2019) | 10.1088/1361-6382/ab4212 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most obvious obstacle behind a direct test of Quantum Gravity (QG) is its
energy scale ($10^{19}$ GeV), which remains well outside of any human made
machine. The next best possible approach is to provide indirect tests on
effective theories of QG which can be performed in a lower energy scale. This
paper is aimed... | [
{
"created": "Thu, 24 Jan 2019 20:48:55 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Feb 2019 19:03:36 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Oct 2019 16:08:24 GMT",
"version": "v3"
}
] | 2019-10-16 | [
[
"Villalpando",
"Carlos",
""
],
[
"Modak",
"Sujoy K.",
""
]
] | The most obvious obstacle behind a direct test of Quantum Gravity (QG) is its energy scale ($10^{19}$ GeV), which remains well outside of any human made machine. The next best possible approach is to provide indirect tests on effective theories of QG which can be performed in a lower energy scale. This paper is aimed i... |
0705.4609 | Salvatore Capozziello | S.A. Ali, S. Capozziello | Nonlinear Realization of the Local Conform-Affine Symmetry Group for
Gravity in the Composite Fiber Bundle Formalism | 24 pages. to appear in IJGMMP | Int.J.Geom.Meth.Mod.Phys.4:1041-1074,2007 | 10.1142/S0219887807002429 | null | gr-qc | null | A gauge theory of gravity based on a nonlinear realization (NLR) of the local
Conform-Affine (CA) group of symmetry transformations is presented. The coframe
fields and gauge connections of the theory are obtained. The tetrads and
Lorentz group metric are used to induce a spacetime metric. The inhomogenously
transfor... | [
{
"created": "Thu, 31 May 2007 13:57:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ali",
"S. A.",
""
],
[
"Capozziello",
"S.",
""
]
] | A gauge theory of gravity based on a nonlinear realization (NLR) of the local Conform-Affine (CA) group of symmetry transformations is presented. The coframe fields and gauge connections of the theory are obtained. The tetrads and Lorentz group metric are used to induce a spacetime metric. The inhomogenously transformi... |
0808.3233 | Piotr T. Chru\'sciel | Piotr T. Chru\'sciel, Gregory J. Galloway, Didier Solis | Topological censorship for Kaluza-Klein space-times | minor corrections | Annales Henri Poincare 10:893-912,2009 | 10.1007/s00023-009-0005-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard topological censorship theorems require asymptotic hypotheses
which are too restrictive for several situations of interest. In this paper we
prove a version of topological censorship under significantly weaker
conditions, compatible e.g. with solutions with Kaluza-Klein asymptotic
behavior. In particular... | [
{
"created": "Sun, 24 Aug 2008 18:37:00 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 2009 07:18:52 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Galloway",
"Gregory J.",
""
],
[
"Solis",
"Didier",
""
]
] | The standard topological censorship theorems require asymptotic hypotheses which are too restrictive for several situations of interest. In this paper we prove a version of topological censorship under significantly weaker conditions, compatible e.g. with solutions with Kaluza-Klein asymptotic behavior. In particular w... |
gr-qc/0303091 | Pavel Krtous | J. Bicak, P. Krtous | Radiative fields in spacetimes with Minkowski and de Sitter asymptotics | 23 pages, invited talk, 10th Greek Relativity Meeting, Chalkidiki,
May 2002 | null | 10.1142/9789812791238_0001 | null | gr-qc | null | The classical Bondi-Penrose approach to the gravitational radiation theory in
asymptotically flat spacetimes is recalled and recent advances in the proofs of
the existence of such spacetimes are briefly reviewed. We then mention the
unique role of the boost-rotation symmetric spacetimes, representing uniformly
accele... | [
{
"created": "Mon, 24 Mar 2003 10:15:27 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bicak",
"J.",
""
],
[
"Krtous",
"P.",
""
]
] | The classical Bondi-Penrose approach to the gravitational radiation theory in asymptotically flat spacetimes is recalled and recent advances in the proofs of the existence of such spacetimes are briefly reviewed. We then mention the unique role of the boost-rotation symmetric spacetimes, representing uniformly accelera... |
gr-qc/0302050 | Giovanni Santostasi | Giovanni Santostasi, Juhan Frank, Warren Johnson | Detectability of Gravitational Waves from SN 1987A | null | Astrophys.J.586:1191-1198,2003 | 10.1086/367762 | null | gr-qc | null | We discuss the potential for detection of gravitational waves from a rapidly
spinning neutron star produced by supernova 1987A taking the parameters claimed
by Middleditch et al. (2000) at face value. Asssuming that the dominant
mechanism for spin down is gravitational waves emitted by a freely precessing
neutron sta... | [
{
"created": "Wed, 12 Feb 2003 23:35:19 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Santostasi",
"Giovanni",
""
],
[
"Frank",
"Juhan",
""
],
[
"Johnson",
"Warren",
""
]
] | We discuss the potential for detection of gravitational waves from a rapidly spinning neutron star produced by supernova 1987A taking the parameters claimed by Middleditch et al. (2000) at face value. Asssuming that the dominant mechanism for spin down is gravitational waves emitted by a freely precessing neutron star,... |
2209.07049 | PanPan Wang | Yu Hu, Pan-Pan Wang, Yu-Jie Tan, and Cheng-Gang Shao | Testing the polarization of gravitational wave background with
LISA-TianQin network | null | null | null | null | gr-qc physics.data-an | http://creativecommons.org/licenses/by/4.0/ | While general relativity predicts only two tensor modes for gravitational
wave polarization, general metric theories of gravity allows up to four
additional modes, including two vector and two scalar modes. Observing the
polarization modes of gravitational waves could provide a direct test of the
modified gravity. Th... | [
{
"created": "Thu, 15 Sep 2022 05:12:04 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Mar 2023 11:29:37 GMT",
"version": "v2"
}
] | 2023-03-07 | [
[
"Hu",
"Yu",
""
],
[
"Wang",
"Pan-Pan",
""
],
[
"Tan",
"Yu-Jie",
""
],
[
"Shao",
"Cheng-Gang",
""
]
] | While general relativity predicts only two tensor modes for gravitational wave polarization, general metric theories of gravity allows up to four additional modes, including two vector and two scalar modes. Observing the polarization modes of gravitational waves could provide a direct test of the modified gravity. The ... |
1311.5854 | Carlos Kozameh | Carlos N. Kozameh, Gonzalo D. Quiroga | Center of Mass and spin for isolated sources of gravitational radiation | 16 pages. Accepted for publication in Phys. Rev. D | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define the center of mass and spin of an isolated system in General
Relativity. The resulting relationships between these variables and the total
linear and angular momentum of the gravitational system are remarkably similar
to their Newtonian counterparts, though only variables at the null boundary of
an asymptot... | [
{
"created": "Fri, 22 Nov 2013 19:49:05 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2014 22:33:51 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Oct 2014 17:17:44 GMT",
"version": "v3"
},
{
"created": "Tue, 4 Aug 2015 18:41:26 GMT",
"version": "v4"
},
{
"cr... | 2016-03-16 | [
[
"Kozameh",
"Carlos N.",
""
],
[
"Quiroga",
"Gonzalo D.",
""
]
] | We define the center of mass and spin of an isolated system in General Relativity. The resulting relationships between these variables and the total linear and angular momentum of the gravitational system are remarkably similar to their Newtonian counterparts, though only variables at the null boundary of an asymptotic... |
gr-qc/0111112 | Luis Herrera | L. Herrera and D. Pavon | Hyperbolic theories of dissipation: Why and when do we need them? | 15 pages Latex, to appear in Physica A | Physica A307 (2002) 121-130 | 10.1016/S0378-4371(01)00614-8 | null | gr-qc astro-ph cond-mat math-ph math.MP | null | We illustrate and emphasize the relevance of hyperbolic theories of
dissipation in different physical scenarios. Particular attention is paid to
self-gravitating systems where the relaxation time may become large enough as
to require a description of the transient regime. It is argued that even
outside that regime, h... | [
{
"created": "Fri, 30 Nov 2001 14:06:38 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Herrera",
"L.",
""
],
[
"Pavon",
"D.",
""
]
] | We illustrate and emphasize the relevance of hyperbolic theories of dissipation in different physical scenarios. Particular attention is paid to self-gravitating systems where the relaxation time may become large enough as to require a description of the transient regime. It is argued that even outside that regime, hyp... |
gr-qc/9503022 | null | F.Belgiorno, S.Liberati | Divergences problem in black hole brick-wall model | 19 pages, reviseted-extended version accepted by Phys. Rev. D | Phys.Rev. D53 (1996) 3172-3177 | 10.1103/PhysRevD.53.3172 | Roma1-1093/95 | gr-qc hep-th | null | In this work we review, in the framework of the so-called brick wall model,
the divergence problem arising in the one loop calculations of various
thermodynamical quantities, like entropy, internal energy and heat capacity.
Particularly we find that, if one imposes that entanglement entropy is equal to
the Bekenstein... | [
{
"created": "Tue, 14 Mar 1995 15:11:13 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jan 1996 16:57:30 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Belgiorno",
"F.",
""
],
[
"Liberati",
"S.",
""
]
] | In this work we review, in the framework of the so-called brick wall model, the divergence problem arising in the one loop calculations of various thermodynamical quantities, like entropy, internal energy and heat capacity. Particularly we find that, if one imposes that entanglement entropy is equal to the Bekenstein-H... |
1011.0544 | Shin'ichi Nojiri | Shin'ichi Nojiri and Sergei D. Odintsov | Unified cosmic history in modified gravity: from F(R) theory to Lorentz
non-invariant models | LaTeX 99 pages, the version to appear in Physics Reports, typos are
corrected | Phys.Rept.505:59-144,2011 | 10.1016/j.physrep.2011.04.001 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classical generalization of general relativity is considered as gravitational
alternative for unified description of the early-time inflation with late-time
cosmic acceleration. The structure and cosmological properties of number of
modified theories, including traditional $F(R)$ and Ho\v{r}ava-Lifshitz $F(R)$
gravit... | [
{
"created": "Tue, 2 Nov 2010 09:09:34 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Nov 2010 14:36:33 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Feb 2011 13:32:12 GMT",
"version": "v3"
},
{
"created": "Sun, 29 May 2011 07:12:32 GMT",
"version": "v4"
}
] | 2011-07-26 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | Classical generalization of general relativity is considered as gravitational alternative for unified description of the early-time inflation with late-time cosmic acceleration. The structure and cosmological properties of number of modified theories, including traditional $F(R)$ and Ho\v{r}ava-Lifshitz $F(R)$ gravity,... |
2104.10192 | Damianos Iosifidis | Damianos Iosifidis | Riemann Tensor and Gauss-Bonnet density in Metric-Affine Cosmology | 15 pages, no figures | null | 10.1088/1361-6382/ac213a | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We analytically derive the covariant form of the Riemann (curvature) tensor
for homogeneous Metric-Affine Cosmologies. That is, we present, in a
Cosmological setting, the most general covariant form of the full Riemann
tensor including also its non-Riemannian pieces which are associated to
spacetime torsion and non-m... | [
{
"created": "Tue, 20 Apr 2021 18:20:11 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2021 10:46:39 GMT",
"version": "v2"
}
] | 2021-10-27 | [
[
"Iosifidis",
"Damianos",
""
]
] | We analytically derive the covariant form of the Riemann (curvature) tensor for homogeneous Metric-Affine Cosmologies. That is, we present, in a Cosmological setting, the most general covariant form of the full Riemann tensor including also its non-Riemannian pieces which are associated to spacetime torsion and non-met... |
gr-qc/9911018 | Bin Wang | Bin Wang, Elcio Abdalla and Ru-Keng Su | Geometry and topology of two kinds of extreme
Reissner-Nordstr$\ddot{o}$m-anti-de Sitter black holes | Latex, 12 pages, 4 figures | Phys.Rev. D62 (2000) 047501 | 10.1103/PhysRevD.62.047501 | null | gr-qc | null | Different geometrical and topological properties have been shown for two
kinds of extreme Reissner-Nordstr$\ddot{o}$m-anti-de Sitter black holes. The
relationship between the geometrical properties and the intrinsic
thermodynamical properties has been made explicit.
| [
{
"created": "Fri, 5 Nov 1999 14:15:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Wang",
"Bin",
""
],
[
"Abdalla",
"Elcio",
""
],
[
"Su",
"Ru-Keng",
""
]
] | Different geometrical and topological properties have been shown for two kinds of extreme Reissner-Nordstr$\ddot{o}$m-anti-de Sitter black holes. The relationship between the geometrical properties and the intrinsic thermodynamical properties has been made explicit. |
2211.00388 | Shingo Akama | Shingo Akama and Shin'ichi Hirano | Primordial non-Gaussianity from Galilean Genesis without strong coupling
problem | 16 pages, 1 figure | null | 10.1103/PhysRevD.107.063504 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Galilean Genesis is generically plagued with a strong coupling problem, but
this can be avoided depending on the hierarchy between a classical energy scale
of genesis and a strong coupling scale. In this paper, we investigate whether
or not the models of Galilean Genesis without the strong coupling problem can
explai... | [
{
"created": "Tue, 1 Nov 2022 11:17:23 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2022 15:07:03 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Nov 2022 13:54:46 GMT",
"version": "v3"
}
] | 2023-03-15 | [
[
"Akama",
"Shingo",
""
],
[
"Hirano",
"Shin'ichi",
""
]
] | Galilean Genesis is generically plagued with a strong coupling problem, but this can be avoided depending on the hierarchy between a classical energy scale of genesis and a strong coupling scale. In this paper, we investigate whether or not the models of Galilean Genesis without the strong coupling problem can explain ... |
gr-qc/0102110 | Aleksandar Mikovic | A. Mikovic | Quantum Field Theory of Spin Networks | 28 pages | Class.Quant.Grav.18:2827-2850,2001 | 10.1088/0264-9381/18/14/313 | null | gr-qc hep-th | null | We study the transition amplitudes in state-sum models of quantum gravity in
D=2,3,4 spacetime dimensions by using the field theory over a Lie group
formulation. By promoting the group theory Fourier modes into creation and
annihilation operators we construct a Fock space for the quantum field theory
whose Feynman di... | [
{
"created": "Tue, 27 Feb 2001 17:30:51 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Mikovic",
"A.",
""
]
] | We study the transition amplitudes in state-sum models of quantum gravity in D=2,3,4 spacetime dimensions by using the field theory over a Lie group formulation. By promoting the group theory Fourier modes into creation and annihilation operators we construct a Fock space for the quantum field theory whose Feynman diag... |
2403.15174 | Remo Garattini | Remo Garattini, Mir Faizal | Hot Casimir Wormholes | LaTeX 12 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we have for the first time considered the consequences of
thermal fluctuations to the Casimir effect on a traversable wormhole. This was
done by using finite temperature generalization of the Casimir effect as a
source of a hot traversable wormhole. Thus, we have considered a more physical
scenario, wh... | [
{
"created": "Fri, 22 Mar 2024 12:55:51 GMT",
"version": "v1"
}
] | 2024-03-25 | [
[
"Garattini",
"Remo",
""
],
[
"Faizal",
"Mir",
""
]
] | In this paper, we have for the first time considered the consequences of thermal fluctuations to the Casimir effect on a traversable wormhole. This was done by using finite temperature generalization of the Casimir effect as a source of a hot traversable wormhole. Thus, we have considered a more physical scenario, wher... |
1207.5525 | Luis Cort\'es Barbado | Luis C. Barbado and Matt Visser | Unruh-DeWitt detector event rate for trajectories with time-dependent
acceleration | 12 pages, 9 figures | Physical Review D 86 (2012) 084011 | 10.1103/PhysRevD.86.084011 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the response function of an Unruh--DeWitt detector moving with
time-dependent acceleration along a one-dimensional trajectory in Minkowski
spacetime. To extract the physics of the process, we propose an adiabatic
expansion of this response function. This expansion is also a useful tool for
computing the cl... | [
{
"created": "Mon, 23 Jul 2012 20:18:31 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2012 10:52:16 GMT",
"version": "v2"
}
] | 2012-10-26 | [
[
"Barbado",
"Luis C.",
""
],
[
"Visser",
"Matt",
""
]
] | We analyse the response function of an Unruh--DeWitt detector moving with time-dependent acceleration along a one-dimensional trajectory in Minkowski spacetime. To extract the physics of the process, we propose an adiabatic expansion of this response function. This expansion is also a useful tool for computing the clic... |
gr-qc/0502057 | Mustafa Salti | Ali Havare, Mustafa Salti, Taylan Yetkin | On the Energy-Momentum Densities of the Cylindrically Symmetric
Gravitational Waves | 7 pages, no figures | null | null | null | gr-qc | null | In this study, using Moller and Tolman prescriptions we calculate energy and
momentum densities for the general cylindrically symmetric spacetime metric. We
find that results are finite and well defined in these complexes. We also give
the results for some cylindrically symmetric spacetime models.
| [
{
"created": "Sat, 12 Feb 2005 12:38:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Havare",
"Ali",
""
],
[
"Salti",
"Mustafa",
""
],
[
"Yetkin",
"Taylan",
""
]
] | In this study, using Moller and Tolman prescriptions we calculate energy and momentum densities for the general cylindrically symmetric spacetime metric. We find that results are finite and well defined in these complexes. We also give the results for some cylindrically symmetric spacetime models. |
2306.14855 | Celia Escamilla-Rivera | Celia Escamilla-Rivera, Jos\'e Mar\'ia de Albornoz-Caratozzolo and
Sebasti\'an N\'ajera | Fab-Four cosmography to tackle the Hubble tension | 12 pages, 1 table. Version accepted in Universe | Universe 2023, 9(7), 311 | 10.3390/universe9070311 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In the context of the Fab-Four theory of gravity in a
Friedmann-Lema\^itre-Robertson-Walker background, in this work we use the
cosmography approach to study a particular self-tuning filter solution focused
on a zero-curvature fixed point to study the $H_0$ tension. In this scheme, the
equations restrict the universe... | [
{
"created": "Mon, 26 Jun 2023 17:08:57 GMT",
"version": "v1"
}
] | 2023-06-29 | [
[
"Escamilla-Rivera",
"Celia",
""
],
[
"de Albornoz-Caratozzolo",
"José María",
""
],
[
"Nájera",
"Sebastián",
""
]
] | In the context of the Fab-Four theory of gravity in a Friedmann-Lema\^itre-Robertson-Walker background, in this work we use the cosmography approach to study a particular self-tuning filter solution focused on a zero-curvature fixed point to study the $H_0$ tension. In this scheme, the equations restrict the universe's... |
gr-qc/9706015 | Mohammad Nouri-Zonoz | Mohammad Nouri-Zonoz | Cylindrical analogue of NUT space: spacetime of a line gravomagnetic
monopole | 11 pages, 1 figure, Latex | Class.Quant.Grav. 14 (1997) 3123-3129 | 10.1088/0264-9381/14/11/012 | null | gr-qc | null | Using the quasi-Maxwell form of the vacuum Einstein equations and demanding
the presence of a cylindrically symmetric radial gravomagnetic field, we find
the solution to the Einstein equations which represents the gravity field of a
line gravomagnetic monopole. We show that this is the generalization of the
Levi-Civi... | [
{
"created": "Thu, 5 Jun 1997 17:56:09 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Nouri-Zonoz",
"Mohammad",
""
]
] | Using the quasi-Maxwell form of the vacuum Einstein equations and demanding the presence of a cylindrically symmetric radial gravomagnetic field, we find the solution to the Einstein equations which represents the gravity field of a line gravomagnetic monopole. We show that this is the generalization of the Levi-Civita... |
1202.0762 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | The compatibility of thin-shell wormholes with quantum field theory | Invited talk, International Conference on Dynamical Systems, Kolkata,
India (January, 2012) | Bull. Calcutta Math. Soc., vol. 104, 415 (2012) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown in this paper that thin-shell wormholes, mathematically
constructed by the standard cut-and-paste technique, can, under fairly general
conditions, be compatible with quantum field theory.
| [
{
"created": "Fri, 3 Feb 2012 16:45:46 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jan 2013 18:03:10 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Mar 2013 20:39:46 GMT",
"version": "v3"
},
{
"created": "Fri, 4 Jul 2014 22:08:55 GMT",
"version": "v4"
}
] | 2014-07-08 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | It is shown in this paper that thin-shell wormholes, mathematically constructed by the standard cut-and-paste technique, can, under fairly general conditions, be compatible with quantum field theory. |
2406.13020 | Jack Manley | J. Manley, C. A. Condos, S. Schlamminger, J. R. Pratt, D. J. Wilson,
W. A. Terrano | Microscale torsion resonators for short-range gravity experiments | null | null | null | null | gr-qc hep-ph physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measuring gravitational interactions on sub-100-$\mu$m length scales offers a
window into physics beyond the Standard Model. However, short-range gravity
experiments are limited by the ability to position sufficiently massive objects
to within small separation distances. Here we propose mass-loaded silicon
nitride ri... | [
{
"created": "Tue, 18 Jun 2024 19:27:24 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 21:20:10 GMT",
"version": "v2"
}
] | 2024-07-29 | [
[
"Manley",
"J.",
""
],
[
"Condos",
"C. A.",
""
],
[
"Schlamminger",
"S.",
""
],
[
"Pratt",
"J. R.",
""
],
[
"Wilson",
"D. J.",
""
],
[
"Terrano",
"W. A.",
""
]
] | Measuring gravitational interactions on sub-100-$\mu$m length scales offers a window into physics beyond the Standard Model. However, short-range gravity experiments are limited by the ability to position sufficiently massive objects to within small separation distances. Here we propose mass-loaded silicon nitride ribb... |
gr-qc/0112065 | Koryukin | Valery Koryukin (Mari State Technical University) | The dark matter and the condensed description by the gravitational
fields in the field theory | plain tex, 5 pages | null | null | null | gr-qc | null | In this work the approach for a description of the physical systems about
whiches it is not possible to get basicly the total information is suggested.
As a result the differential equations, the solutions of which characterize
the physical system, must bieng obtained from the demand of the minimality of
the genera... | [
{
"created": "Mon, 24 Dec 2001 09:49:58 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Koryukin",
"Valery",
"",
"Mari State Technical University"
]
] | In this work the approach for a description of the physical systems about whiches it is not possible to get basicly the total information is suggested. As a result the differential equations, the solutions of which characterize the physical system, must bieng obtained from the demand of the minimality of the generalize... |
0811.0919 | Remo Garattini | Remo Garattini and Francisco S. N. Lobo | Self-sustained traversable wormholes in noncommutative geometry | 8 pages, 4 figures. Final version to appear in PLB. References added
and one figure | Phys.Lett.B671:146-152,2009 | 10.1016/j.physletb.2008.11.064 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we find exact wormhole solutions in the context of
noncommutative geometry, and further explore their physical properties and
characteristics. The energy density of these wormhole geometries is a smeared
and particle-like gravitational source, where the mass is diffused throughout a
region of linear dim... | [
{
"created": "Thu, 6 Nov 2008 12:02:07 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2008 14:30:47 GMT",
"version": "v2"
}
] | 2008-12-23 | [
[
"Garattini",
"Remo",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, we find exact wormhole solutions in the context of noncommutative geometry, and further explore their physical properties and characteristics. The energy density of these wormhole geometries is a smeared and particle-like gravitational source, where the mass is diffused throughout a region of linear dimen... |
2005.09576 | Rodrigo Maier | Rodrigo Maier | Nonsingular Black Holes From Charged Dust Collapse: A Concrete Mechanism
to Evade Interior Singularities in General Relativity | Submitted to IJMPD | null | 10.1142/S0218271820430233 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this essay we examine the gravitational collapse of a nonrelativistic
charged perfect fluid interacting with a dark energy component. Given a simple
factor for the energy transfer, we obtain a nonsingular interior solution which
naturally matches the Reissner-Nordstr\"om-de Sitter exterior geometry. We also
show t... | [
{
"created": "Tue, 19 May 2020 16:42:06 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2020 19:13:47 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Maier",
"Rodrigo",
""
]
] | In this essay we examine the gravitational collapse of a nonrelativistic charged perfect fluid interacting with a dark energy component. Given a simple factor for the energy transfer, we obtain a nonsingular interior solution which naturally matches the Reissner-Nordstr\"om-de Sitter exterior geometry. We also show tha... |
1702.01269 | Biswajit Paul | Biswajit Paul | Removing Ostrogradski ghost from degenerate gravity theories | 20 pages, LaTex, slight modification in texts, to appear in PRD | Phys. Rev. D 96, 044035 (2017) | 10.1103/PhysRevD.96.044035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Ostrogradski ghost problem that appears in higher derivative system is
considered for systems with constraints. A prescription for removal of the
ghost creating momenta is described based on the Dirac's constraint analysis.
It is shown how one can make the canonical Hamiltonian bounded from below by
systematicall... | [
{
"created": "Sat, 4 Feb 2017 11:18:58 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jul 2017 16:36:07 GMT",
"version": "v2"
}
] | 2017-08-30 | [
[
"Paul",
"Biswajit",
""
]
] | The Ostrogradski ghost problem that appears in higher derivative system is considered for systems with constraints. A prescription for removal of the ghost creating momenta is described based on the Dirac's constraint analysis. It is shown how one can make the canonical Hamiltonian bounded from below by systematically ... |
1907.10364 | Tsvetan Vetsov Dr. | K. Kolev, K. Staykov, T. Vetsov | Thermodynamic Stability of the Stationary Lifshitz Black Hole of New
Massive Gravity | Minor corrections | Eur. Phys. J. C 79, 1009 (2019) | 10.1140/epjc/s10052-019-7522-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the thermodynamic properties of the stationary
Lifshitz black hole solution of New Massive Gravity. We study the thermodynamic
stability from local and global point of view. We also consider the space of
equilibrium states for the solution within the framework of Thermodynamic
Information... | [
{
"created": "Wed, 24 Jul 2019 11:08:14 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2019 19:59:54 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Dec 2019 13:23:51 GMT",
"version": "v3"
},
{
"created": "Sat, 29 Aug 2020 11:23:43 GMT",
"version": "v4"
}
] | 2020-09-01 | [
[
"Kolev",
"K.",
""
],
[
"Staykov",
"K.",
""
],
[
"Vetsov",
"T.",
""
]
] | In this paper we investigate the thermodynamic properties of the stationary Lifshitz black hole solution of New Massive Gravity. We study the thermodynamic stability from local and global point of view. We also consider the space of equilibrium states for the solution within the framework of Thermodynamic Information G... |
1906.08954 | Ryotaro Kase | Ryotaro Kase and Shinji Tsujikawa | Neutron stars in $f(R)$ gravity and scalar-tensor theories | 19 pages, 6 figures, published version | JCAP 1909 (2019) no.09, 054 | 10.1088/1475-7516/2019/09/054 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In $f(R)$ gravity and Brans-Dicke theory with scalar potentials, we study the
structure of neutron stars on a spherically symmetric and static background for
two equations of state: SLy and FPS. In massless BD theory, the presence of a
scalar coupling $Q$ with matter works to change the star radius in comparison
to G... | [
{
"created": "Fri, 21 Jun 2019 05:39:58 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2019 09:31:32 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Oct 2019 08:03:16 GMT",
"version": "v3"
}
] | 2019-10-04 | [
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | In $f(R)$ gravity and Brans-Dicke theory with scalar potentials, we study the structure of neutron stars on a spherically symmetric and static background for two equations of state: SLy and FPS. In massless BD theory, the presence of a scalar coupling $Q$ with matter works to change the star radius in comparison to Gen... |
2306.14473 | Patrick Das Gupta | Patrick Das Gupta and Mohd. Sirtaz | Black Hole Menagerie, Charged/Dyonic BHs and Radiation from Interacting
Dyonic BH Pairs | A somewhat modified version of this article that includes several
figures had been published in "A Guide to Black Holes" ed. Kenath Arun, Nova
Science Publishers, 2022, ISBN: 979-8-88697-163-7 | null | 10.52305/TKOH1520 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We describe charged BHs, Penrose process for energy extraction from Kerr BHs
and Wald's proposal concerning a Kerr BH slowly becoming a Kerr-Newman BH in
the presence of a uniform magnetic field. In the context of BHs bearing
magnetic charge, we discuss both magnetic monopoles as well as dyons, and their
emergence fr... | [
{
"created": "Mon, 26 Jun 2023 07:27:11 GMT",
"version": "v1"
}
] | 2023-06-27 | [
[
"Gupta",
"Patrick Das",
""
],
[
"Sirtaz",
"Mohd.",
""
]
] | We describe charged BHs, Penrose process for energy extraction from Kerr BHs and Wald's proposal concerning a Kerr BH slowly becoming a Kerr-Newman BH in the presence of a uniform magnetic field. In the context of BHs bearing magnetic charge, we discuss both magnetic monopoles as well as dyons, and their emergence from... |
1002.0490 | Jan Holland | Stefan Hollands, Jan Holland and Akihiro Ishibashi | Further restrictions on the topology of stationary black holes in five
dimensions | LaTex, 22 pages, 9 figures | null | 10.1007/s00023-011-0079-2 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We place further restriction on the possible topology of stationary
asymptotically flat vacuum black holes in 5 spacetime dimensions. We prove that
the horizon manifold can be either a connected sum of Lens spaces and "handles"
$S^1 \times S^2$, or the quotient of $S^3$ by certain finite groups of
isometries (with no... | [
{
"created": "Tue, 2 Feb 2010 14:38:05 GMT",
"version": "v1"
}
] | 2013-07-17 | [
[
"Hollands",
"Stefan",
""
],
[
"Holland",
"Jan",
""
],
[
"Ishibashi",
"Akihiro",
""
]
] | We place further restriction on the possible topology of stationary asymptotically flat vacuum black holes in 5 spacetime dimensions. We prove that the horizon manifold can be either a connected sum of Lens spaces and "handles" $S^1 \times S^2$, or the quotient of $S^3$ by certain finite groups of isometries (with no "... |
1605.02846 | Kiyoshi Shiraishi | Nahomi Kan (NIT, Gifu College) and Kiyoshi Shiraishi (Yamaguchi
University) | Analytical Approximation for Newtonian Boson Stars in Four and Five
Dimensions -- A Poor Person's Approach to Rotating Boson Stars | 21 pages, 6 figures. version 3 (Added some explanations) | Phys. Rev. D 94, 104042 (2016) | 10.1103/PhysRevD.94.104042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study rotating boson stars in the large coupling limit as
well as in the Newtonian limit. We investigate the equilibrium solutions in
four and five dimensions by adopting some analytical approximations. We show
that the relations among the radius, angular momentum, Newtonian energy and
quadrupole mo... | [
{
"created": "Tue, 10 May 2016 04:51:48 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2016 08:54:04 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Aug 2016 07:46:08 GMT",
"version": "v3"
}
] | 2016-11-23 | [
[
"Kan",
"Nahomi",
"",
"NIT, Gifu College"
],
[
"Shiraishi",
"Kiyoshi",
"",
"Yamaguchi\n University"
]
] | In this paper, we study rotating boson stars in the large coupling limit as well as in the Newtonian limit. We investigate the equilibrium solutions in four and five dimensions by adopting some analytical approximations. We show that the relations among the radius, angular momentum, Newtonian energy and quadrupole mome... |
gr-qc/9506037 | Evan Reidell | R. Jackiw | Quantal Modifications to the Wheeler DeWitt Equation | 10 pages in REVTeX | null | null | MIT-CTP-2442 | gr-qc hep-th | null | Commutator anomalies obstruct solving the Wheeler-DeWitt constraint equation
in Dirac quantization of quantum gravity-matter theory. When the obstruction is
removed, there result quantal modifications to the constraints. The same
classical theory gives rise to different quantum theories when different
procedures for ... | [
{
"created": "Mon, 19 Jun 1995 16:48:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jackiw",
"R.",
""
]
] | Commutator anomalies obstruct solving the Wheeler-DeWitt constraint equation in Dirac quantization of quantum gravity-matter theory. When the obstruction is removed, there result quantal modifications to the constraints. The same classical theory gives rise to different quantum theories when different procedures for ov... |
2012.12094 | Abhay Ashtekar | Abhay Ashtekar and Madhavan Varadarajan | Gravitational dynamics: A novel shift in the Hamiltonian paradigm | Invited article to the 5 year Commemorative issue. 39 pages; Attempt
made to make the presentation reasonably self-contained so as to be
accessible to the general relativity, "double copy" and mathematical physics
communities. In the revised version minor typos were corrected and two
references were added | Universe 7, 13 (2021) | 10.3390/universe7010013 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that Einstein's equations assume a simple polynomial form in
the Hamiltonian framework based on a Yang-Mills phase space. We re-examine the
gravitational dynamics in this framework and show that {\em time} evolution of
the gravitational field can be re-expressed as (a gauge covariant
generalization o... | [
{
"created": "Tue, 22 Dec 2020 15:34:37 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jan 2021 19:39:48 GMT",
"version": "v2"
}
] | 2021-01-14 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Varadarajan",
"Madhavan",
""
]
] | It is well known that Einstein's equations assume a simple polynomial form in the Hamiltonian framework based on a Yang-Mills phase space. We re-examine the gravitational dynamics in this framework and show that {\em time} evolution of the gravitational field can be re-expressed as (a gauge covariant generalization of)... |
2003.06215 | Badri Krishnan | Vaishak Prasad, Anshu Gupta, Sukanta Bose, Badri Krishnan and Erik
Schnetter | News from horizons in binary black hole mergers | 7 Pages, 1 Figure | Phys. Rev. Lett. 125, 121101 (2020) | 10.1103/PhysRevLett.125.121101 | LIGO Preprint number LIGO-P2000098 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a binary black hole merger, it is known that the inspiral portion of the
waveform corresponds to two distinct horizons orbiting each other, and the
merger and ringdown signals correspond to the final horizon being formed and
settling down to equilibrium. However, we still lack a detailed understanding
of the relat... | [
{
"created": "Fri, 13 Mar 2020 12:09:17 GMT",
"version": "v1"
}
] | 2020-09-21 | [
[
"Prasad",
"Vaishak",
""
],
[
"Gupta",
"Anshu",
""
],
[
"Bose",
"Sukanta",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Schnetter",
"Erik",
""
]
] | In a binary black hole merger, it is known that the inspiral portion of the waveform corresponds to two distinct horizons orbiting each other, and the merger and ringdown signals correspond to the final horizon being formed and settling down to equilibrium. However, we still lack a detailed understanding of the relatio... |
gr-qc/0305108 | Raul Vera | Ra\"ul Vera | Influence of general convective motions on the exterior of isolated
rotating bodies in equilibrium | 8 pages, LaTex, uses iopart style files. To appear in Class. Quatum
Grav | Class.Quant.Grav.20:2785-2792,2003 | 10.1088/0264-9381/20/13/324 | null | gr-qc | null | The problem of describing isolated rotating bodies in equilibrium in General
Relativity has so far been treated under the assumption of the circularity
condition in the interior of the body. For a fluid without energy flux, this
condition implies that the fluid flow moves only along the angular direction,
i.e. there ... | [
{
"created": "Thu, 29 May 2003 17:50:07 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Vera",
"Raül",
""
]
] | The problem of describing isolated rotating bodies in equilibrium in General Relativity has so far been treated under the assumption of the circularity condition in the interior of the body. For a fluid without energy flux, this condition implies that the fluid flow moves only along the angular direction, i.e. there is... |
gr-qc/0212021 | Allan Joseph Medved | Gilad Gour and A.J.M. Medved | Quantum Spectrum for a Kerr-Newman Black Hole | 13 pages, Revtex | Class.Quant.Grav.20:1661-1672,2003 | 10.1088/0264-9381/20/9/305 | null | gr-qc hep-th quant-ph | null | In this paper, we consider the quantum area spectrum for a rotating and
charged (Kerr-Newman) black hole. Generalizing a recent study on Kerr black
holes (which was inspired by the static-black hole formalism of Barvinsky, Das
and Kunstatter), we show that the quantized area operator can be expressed in
terms of thre... | [
{
"created": "Wed, 4 Dec 2002 20:33:03 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gour",
"Gilad",
""
],
[
"Medved",
"A. J. M.",
""
]
] | In this paper, we consider the quantum area spectrum for a rotating and charged (Kerr-Newman) black hole. Generalizing a recent study on Kerr black holes (which was inspired by the static-black hole formalism of Barvinsky, Das and Kunstatter), we show that the quantized area operator can be expressed in terms of three ... |
gr-qc/0409013 | Jiliang Jing | Songbai Chen and Jiliang Jing | Asymptotic quasinormal modes of a coupled scalar field in the
Garfinkle-Horowitz-Strominger dilaton spacetime | 6 pages, 1 figure | Class.Quant.Grav. 22 (2005) 533-540 | 10.1088/0264-9381/22/3/006 | null | gr-qc | null | The analytic forms of the asymptotic quasinormal frequencies of a coupled
scalar field in the Garfinkle-Horowitz-Strominger dilaton spacetime is
investigated by using the monodromy technique proposed by Motl and Neitzke. It
is found that the asymptotic quasinormal frequencies depend not only on the
structure paramete... | [
{
"created": "Fri, 3 Sep 2004 04:00:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | The analytic forms of the asymptotic quasinormal frequencies of a coupled scalar field in the Garfinkle-Horowitz-Strominger dilaton spacetime is investigated by using the monodromy technique proposed by Motl and Neitzke. It is found that the asymptotic quasinormal frequencies depend not only on the structure parameters... |
1109.3420 | Andrzej Borowiec | A. Borowiec, M. Kamionka, A. Kurek, M. Szydlowski | Cosmic acceleration from modified gravity with Palatini formalism | 32 pages, jcappub style, 28 figures, final improved version, to be
published in JCAP | JCAP 02 (2012) 027 | 10.1088/1475-7516/2012/02/027 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study new FRW type cosmological models of modified gravity treated on the
background of Palatini approach. These models are generalization of Einstein
gravity by the presence of a scalar field non-minimally coupled to the
curvature. The models employ Starobinsky's term in the Lagrangian and dust
matter. Therefore,... | [
{
"created": "Thu, 15 Sep 2011 18:46:09 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2012 15:31:35 GMT",
"version": "v2"
}
] | 2012-03-13 | [
[
"Borowiec",
"A.",
""
],
[
"Kamionka",
"M.",
""
],
[
"Kurek",
"A.",
""
],
[
"Szydlowski",
"M.",
""
]
] | We study new FRW type cosmological models of modified gravity treated on the background of Palatini approach. These models are generalization of Einstein gravity by the presence of a scalar field non-minimally coupled to the curvature. The models employ Starobinsky's term in the Lagrangian and dust matter. Therefore, a... |
gr-qc/0608032 | Myung Seok Yoon | Wontae Kim and Myung Seok Yoon | Accelerating universe in two-dimensional noncommutative dilaton
cosmology | 14 pages, 2 figures; to appear in Phys. Lett. B | Phys.Lett.B645:82-87,2007 | 10.1016/j.physletb.2006.11.075 | null | gr-qc | null | We show that the phase transition from the decelerating universe to the
accelerating universe, which is of relevance to the cosmological coincidence
problem, is possible in the semiclassically quantized two-dimensional dilaton
gravity by taking into account the noncommutative field variables during the
finite time. I... | [
{
"created": "Mon, 7 Aug 2006 03:04:14 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2006 08:04:06 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Dec 2006 04:52:46 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kim",
"Wontae",
""
],
[
"Yoon",
"Myung Seok",
""
]
] | We show that the phase transition from the decelerating universe to the accelerating universe, which is of relevance to the cosmological coincidence problem, is possible in the semiclassically quantized two-dimensional dilaton gravity by taking into account the noncommutative field variables during the finite time. Ini... |
gr-qc/0110015 | Matteo Luca Ruggiero | Angelo Tartaglia, Matteo Luca Ruggiero | Angular momentum effects in Michelson-Morley type experiments | 12 pages, LaTeX; more about the detection technique, references
added; accepted for publication in GRG | Gen.Rel.Grav. 34 (2002) 1371-1382 | 10.1023/A:1020022717216 | null | gr-qc | null | The effect of the angular momentum density of a gravitational source on the
times of flight of light rays in an interferometer is analyzed. The calculation
is made imagining that the interferometer is at the equator of the gravity
source and, as long as possible, the metric, provided it is stationary and
axisymmetric... | [
{
"created": "Tue, 2 Oct 2001 08:19:00 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2002 11:18:58 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Tartaglia",
"Angelo",
""
],
[
"Ruggiero",
"Matteo Luca",
""
]
] | The effect of the angular momentum density of a gravitational source on the times of flight of light rays in an interferometer is analyzed. The calculation is made imagining that the interferometer is at the equator of the gravity source and, as long as possible, the metric, provided it is stationary and axisymmetric, ... |
gr-qc/0003034 | James Overduin | Hongya Liu (1) and James Overduin (2 and 3) ((1) Department of
Physics, Dalian University, P. R. China, (2) Department of Physics,
University of Waterloo, Canada, (3) Gravity Probe B, Hansen Labs, Stanford
University, USA) | Solar System Tests of Higher-Dimensional Gravity | 23 pages, no figs. LaTeX, uses aasms4.sty. ApJ, in press | Astrophys.J. 538 (2000) 386-394 | 10.1086/309115 | null | gr-qc | null | The classical tests of general relativity - light deflection, time delay and
perihelion shift - are applied, along with the geodetic precession test, to the
five-dimensional extension of the theory known as Kaluza-Klein gravity, using
an analogue of the four-dimensional Schwarzschild metric. The perihelion
advance an... | [
{
"created": "Wed, 8 Mar 2000 21:31:05 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Liu",
"Hongya",
"",
"2 and 3"
],
[
"Overduin",
"James",
"",
"2 and 3"
]
] | The classical tests of general relativity - light deflection, time delay and perihelion shift - are applied, along with the geodetic precession test, to the five-dimensional extension of the theory known as Kaluza-Klein gravity, using an analogue of the four-dimensional Schwarzschild metric. The perihelion advance and ... |
1709.03095 | Andrew Williamson | A. R. Williamson (1 and 2), J. Lange (1), R. O'Shaughnessy (1), J. A.
Clark (3), P. Kumar (4 and 5), J. Calder\'on Bustillo (3), J. Veitch (6) ((1)
Rochester Institute of Technology, (2) Radboud University, (3) Georgia
Institute of Technology, (4) University of Toronto, (5) Cornell University,
(6) University of... | Systematic challenges for future gravitational wave measurements of
precessing binary black holes | 12 pages, 9 figures | Phys. Rev. D 96, 124041 (2017) | 10.1103/PhysRevD.96.124041 | LIGO-P1700181 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of precessing, coalescing binary black holes are presently
inferred through comparison with two approximate models of compact binary
coalescence. In this work we show these two models often disagree substantially
when binaries have modestly large spins ($a\gtrsim 0.4$) and modest mass ratios
($q\gtrsim... | [
{
"created": "Sun, 10 Sep 2017 12:55:55 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Sep 2017 12:59:52 GMT",
"version": "v2"
}
] | 2018-01-03 | [
[
"Williamson",
"A. R.",
"",
"1 and 2"
],
[
"Lange",
"J.",
"",
"4 and 5"
],
[
"O'Shaughnessy",
"R.",
"",
"4 and 5"
],
[
"Clark",
"J. A.",
"",
"4 and 5"
],
[
"Kumar",
"P.",
"",
"4 and 5"
],
[
"Bustillo",
"J. C... | The properties of precessing, coalescing binary black holes are presently inferred through comparison with two approximate models of compact binary coalescence. In this work we show these two models often disagree substantially when binaries have modestly large spins ($a\gtrsim 0.4$) and modest mass ratios ($q\gtrsim 2... |
gr-qc/9802038 | Andrei Linde | Andrei Linde | Quantum Creation of an Open Inflationary Universe | 23 pages, 4 figures. New materials are added. In particular, we show
that boundary terms do not help to solve the problem of unacceptably small
Omega in the new model proposed by Hawking and Turok in hep-th/9803156. A
possibility to solve the cosmological constant problem in this model using
the tunneling wave ... | Phys.Rev.D58:083514,1998 | 10.1103/PhysRevD.58.083514 | SU-ITP-98-05 | gr-qc astro-ph hep-ph hep-th | null | We discuss a dramatic difference between the description of the quantum
creation of an open universe using the Hartle-Hawking wave function and the
tunneling wave function. Recently Hawking and Turok have found that the
Hartle-Hawking wave function leads to a universe with Omega = 0.01, which is
much smaller that the... | [
{
"created": "Tue, 17 Feb 1998 07:45:11 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 1998 17:54:08 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Mar 1998 21:44:52 GMT",
"version": "v3"
},
{
"created": "Sun, 22 Mar 1998 18:43:52 GMT",
"version": "v4"
},
{
"c... | 2009-09-29 | [
[
"Linde",
"Andrei",
""
]
] | We discuss a dramatic difference between the description of the quantum creation of an open universe using the Hartle-Hawking wave function and the tunneling wave function. Recently Hawking and Turok have found that the Hartle-Hawking wave function leads to a universe with Omega = 0.01, which is much smaller that the o... |
1010.1570 | Valeri Frolov | A. M. Al Zahrani, Valeri P. Frolov, and Andrey A. Shoom | Particle Dynamics in Weakly Charged Extreme Kerr Throat | The paper is prepared for the fest volume devoted to 75th Birthday of
Mario Castagnino | Int.J.Mod.Phys.D20:649-660,2011 | 10.1142/S0218271811018986 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dynamics of a test charged particle moving in a weakly charged
extreme Kerr throat. Dynamical equations of the particle motion are solved in
quadratures. We show explicitly that the Killing tensor of the Kerr spacetime
becomes reducible in the extreme Kerr throat geometry. Special types of motion
of particle... | [
{
"created": "Thu, 7 Oct 2010 23:29:48 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2010 19:43:14 GMT",
"version": "v2"
}
] | 2011-05-25 | [
[
"Zahrani",
"A. M. Al",
""
],
[
"Frolov",
"Valeri P.",
""
],
[
"Shoom",
"Andrey A.",
""
]
] | We study dynamics of a test charged particle moving in a weakly charged extreme Kerr throat. Dynamical equations of the particle motion are solved in quadratures. We show explicitly that the Killing tensor of the Kerr spacetime becomes reducible in the extreme Kerr throat geometry. Special types of motion of particles ... |
1710.02457 | Rodrigo de Le\'on Ard\'on | R. de Leon Ardon, N. Ohta, R. Percacci | The path integral of unimodular gravity | null | Phys. Rev. D 97, 026007 (2018) | 10.1103/PhysRevD.97.026007 | KU-TP 070 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the one-loop effective action in unimodular gravity, starting from
two different classical formulations of the theory. We find that the effective
action is the same in both cases, and agrees with the one of General
Relativity.
| [
{
"created": "Fri, 6 Oct 2017 15:43:28 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 10:35:37 GMT",
"version": "v2"
}
] | 2018-01-31 | [
[
"Ardon",
"R. de Leon",
""
],
[
"Ohta",
"N.",
""
],
[
"Percacci",
"R.",
""
]
] | We compute the one-loop effective action in unimodular gravity, starting from two different classical formulations of the theory. We find that the effective action is the same in both cases, and agrees with the one of General Relativity. |
1503.04797 | Mir Faizal | Mir Faizal | Deformation of Second and Third Quantization | 10 pages, 0 figures, accepted for publication in Int. J. Mod. Phys. A | Int. J. Mod. Phys. A30: 1550036, 2015 | 10.1142/S0217751X15500360 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will deform the second and third quantized theories by
deforming the canonical commutation relations in such a way that they become
consistent with the generalized uncertainty principle. Thus, we will first
deform the second quantized commutator and obtain a deformed version of the
Wheeler-DeWitt eq... | [
{
"created": "Sun, 15 Mar 2015 06:32:40 GMT",
"version": "v1"
}
] | 2015-03-31 | [
[
"Faizal",
"Mir",
""
]
] | In this paper, we will deform the second and third quantized theories by deforming the canonical commutation relations in such a way that they become consistent with the generalized uncertainty principle. Thus, we will first deform the second quantized commutator and obtain a deformed version of the Wheeler-DeWitt equa... |
1211.7289 | Vojtech Pravda | Marcello Ortaggio, Vojtech Pravda, Alena Pravdova | Algebraic classification of higher dimensional spacetimes based on null
alignment | 59 pages, to appear as Topical Review in Classical and Quantum
Gravity | Class. Quantum Grav. 30: 013001, 2013 | 10.1088/0264-9381/30/1/013001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent developments and applications of the classification of the
Weyl tensor in higher dimensional Lorentzian geometries. First, we discuss the
general setup, i.e. main definitions and methods for the classification, some
refinements and the generalized Newman-Penrose and Geroch-Held-Penrose
formalisms. Ne... | [
{
"created": "Fri, 30 Nov 2012 15:36:54 GMT",
"version": "v1"
}
] | 2012-12-17 | [
[
"Ortaggio",
"Marcello",
""
],
[
"Pravda",
"Vojtech",
""
],
[
"Pravdova",
"Alena",
""
]
] | We review recent developments and applications of the classification of the Weyl tensor in higher dimensional Lorentzian geometries. First, we discuss the general setup, i.e. main definitions and methods for the classification, some refinements and the generalized Newman-Penrose and Geroch-Held-Penrose formalisms. Next... |
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