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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1411.0046 | Paul Wesson | Paul S. Wesson | The Dispersion Relation for Matter Waves in a Two-Phase Vacuum | null | Mod. Phys. Lett. A v.29, No. 31 (2014), 9 pp | 10.1142/S0217732314501685 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological constant (lambda) of general relativity is a natural
consequence of embedding Einstein's theory in a five-dimensional theory of the
type needed for unification. The exact 5D solution for lambda less than 0 shows
waves in ordinary 3D space with properties similar to those of de Broglie or
matter waves... | [
{
"created": "Sat, 1 Nov 2014 00:22:23 GMT",
"version": "v1"
}
] | 2014-11-04 | [
[
"Wesson",
"Paul S.",
""
]
] | The cosmological constant (lambda) of general relativity is a natural consequence of embedding Einstein's theory in a five-dimensional theory of the type needed for unification. The exact 5D solution for lambda less than 0 shows waves in ordinary 3D space with properties similar to those of de Broglie or matter waves. ... |
1108.1974 | Philipp Hoehn | Bianca Dittrich, Philipp A Hoehn | Canonical simplicial gravity | 53 pages, 14 figures, 3 tables, minor clarifications. Matches
published version | Class. Quant. Grav. 29 (2012) 115009 | 10.1088/0264-9381/29/11/115009 | AEI-2011-055, ITP-UU-11/31, SPIN-11/24 | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general canonical formalism for discrete systems is developed which can
handle varying phase space dimensions and constraints. The central ingredient
is Hamilton's principal function which generates canonical time evolution and
ensures that the canonical formalism reproduces the dynamics of the covariant
formulatio... | [
{
"created": "Tue, 9 Aug 2011 16:35:56 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Nov 2012 22:54:38 GMT",
"version": "v2"
}
] | 2012-11-27 | [
[
"Dittrich",
"Bianca",
""
],
[
"Hoehn",
"Philipp A",
""
]
] | A general canonical formalism for discrete systems is developed which can handle varying phase space dimensions and constraints. The central ingredient is Hamilton's principal function which generates canonical time evolution and ensures that the canonical formalism reproduces the dynamics of the covariant formulation ... |
2204.13776 | Safinaz Salem Ms | Safinaz Salem, Moataz H. Emam, and H. H. Salah | The Implications of N = 2 Supergravity Cosmology On the Topology of the
Calabi-Yau Manifold | 13 pages, 7 figures | Al-Azhar Bulletin of Science: Section B, Vol. 33, No. 1, 2022 | 10.21608/absb.2022.121518.1172 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When N= D=11 supergravity is compactified on CY threefold to N=2 D=5
supergravity the action of the last is given in terms of the geometery of the
CY manifold space, namely, in terms of the hypermultiplets. There are
$z^i(i=1,...,h^{2,1})$ complex structure moduli in the moduli space of the CY
manifold which is a spe... | [
{
"created": "Thu, 28 Apr 2022 20:57:53 GMT",
"version": "v1"
}
] | 2022-05-02 | [
[
"Salem",
"Safinaz",
""
],
[
"Emam",
"Moataz H.",
""
],
[
"Salah",
"H. H.",
""
]
] | When N= D=11 supergravity is compactified on CY threefold to N=2 D=5 supergravity the action of the last is given in terms of the geometery of the CY manifold space, namely, in terms of the hypermultiplets. There are $z^i(i=1,...,h^{2,1})$ complex structure moduli in the moduli space of the CY manifold which is a speci... |
gr-qc/0506064 | Marcello Ortaggio | Marcello Ortaggio, Jiri Podolsky, Pavel Krtous | Ultrarelativistic boost of spinning black rings | 15 pages, 2 figures. v2: added multipole expansions at spatial
infinity, and a comparison with the boosted Myers-Perry solution in a new
appendix. To appear in JHEP | JHEP0512:001,2005 | 10.1088/1126-6708/2005/12/001 | null | gr-qc hep-th | null | We study the D=5 Emparan-Reall spinning black ring under an ultrarelativistic
boost along an arbitrary direction. We analytically determine the resulting
shock pp-wave, in particular for boosts along axes orthogonal and parallel to
the plane of rotation. The solution becomes physically more interesting and
simpler if... | [
{
"created": "Fri, 10 Jun 2005 17:16:29 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2005 15:51:33 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ortaggio",
"Marcello",
""
],
[
"Podolsky",
"Jiri",
""
],
[
"Krtous",
"Pavel",
""
]
] | We study the D=5 Emparan-Reall spinning black ring under an ultrarelativistic boost along an arbitrary direction. We analytically determine the resulting shock pp-wave, in particular for boosts along axes orthogonal and parallel to the plane of rotation. The solution becomes physically more interesting and simpler if o... |
1903.10821 | Andronikos Paliathanasis | Andronikos Paliathanasis and Genly Leon | Cosmological solutions in Ho\v{r}ava-Lifshitz gravity | 8 pages, no figures, discussion improved, to appear in Zeitschrift
f\"ur Naturforschung A | ZnA, 75, 523, 2020 | 10.1515/zna-2020-0003 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a detailed study on the integrability of the Ho\v{r}% ava-Lifshitz
scalar field cosmology in a Friedmann--Lema\^{\i}% tre--Robertson--Walker
background spacetime. The approach we follow to determine the integrability is
that of the Singularity Analysis. More specifically, we test if the
gravitational field... | [
{
"created": "Tue, 26 Mar 2019 12:06:24 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Mar 2020 14:00:05 GMT",
"version": "v2"
}
] | 2020-08-19 | [
[
"Paliathanasis",
"Andronikos",
""
],
[
"Leon",
"Genly",
""
]
] | We perform a detailed study on the integrability of the Ho\v{r}% ava-Lifshitz scalar field cosmology in a Friedmann--Lema\^{\i}% tre--Robertson--Walker background spacetime. The approach we follow to determine the integrability is that of the Singularity Analysis. More specifically, we test if the gravitational field e... |
2308.03136 | Raihaneh Moti | Raihaneh Moti | On the Nonlocal Newtonian Cosmology | 19 pages, 5 figures | null | 10.1016/j.dark.2023.101368 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the absence of an exact development of the cosmological models based on
the Mashhoon nonlocal gravity, the Newtonian regime clarifies some aspects of
it. To improve this model more reliable, going through some semi-Post-Newtonian
considerations may be useful. One important feature to consider is the
formation of h... | [
{
"created": "Sun, 6 Aug 2023 15:11:11 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2023 04:58:09 GMT",
"version": "v2"
}
] | 2023-11-01 | [
[
"Moti",
"Raihaneh",
""
]
] | In the absence of an exact development of the cosmological models based on the Mashhoon nonlocal gravity, the Newtonian regime clarifies some aspects of it. To improve this model more reliable, going through some semi-Post-Newtonian considerations may be useful. One important feature to consider is the formation of hor... |
2203.16753 | Csaba Balazs | Csaba Balazs | Observable vacuum energy is finite in expanding space | ( 12 pages ;) | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work I reason that in expanding space only those quantum modes
contribute to the measured vacuum energy that do not transcend the observable
volume. Since all quantised field modes have various observable consequences,
when a gravitational horizon causally confines an observer to a finite volume
quantised mod... | [
{
"created": "Thu, 31 Mar 2022 02:17:10 GMT",
"version": "v1"
}
] | 2022-04-01 | [
[
"Balazs",
"Csaba",
""
]
] | In this work I reason that in expanding space only those quantum modes contribute to the measured vacuum energy that do not transcend the observable volume. Since all quantised field modes have various observable consequences, when a gravitational horizon causally confines an observer to a finite volume quantised modes... |
1212.2571 | Rodrigo Maier | Rodrigo Maier and Ivano Dami\~ao Soares | Gravitational Collapse and Black Hole Thermodynamics In Braneworld
Scenario | null | Int. J. Mod. Phys. D 21, 1250050 (2012) | 10.1142/S0218271812500502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the dynamics of the gravitational collapse in a 4-dim Lorentzian
brane embedded in a 5-dim bulk with an extra timelike dimension. By considering
the collapse of pure dust on the brane we derive a bouncing FLRW interior
solution and match it with a corrected Schwarzschild exterior geometry. In the
physical ... | [
{
"created": "Tue, 11 Dec 2012 18:15:16 GMT",
"version": "v1"
}
] | 2013-01-23 | [
[
"Maier",
"Rodrigo",
""
],
[
"Soares",
"Ivano Damião",
""
]
] | We examine the dynamics of the gravitational collapse in a 4-dim Lorentzian brane embedded in a 5-dim bulk with an extra timelike dimension. By considering the collapse of pure dust on the brane we derive a bouncing FLRW interior solution and match it with a corrected Schwarzschild exterior geometry. In the physical do... |
1305.6343 | Borun Chowdhury | Borun D. Chowdhury | Black holes vs. firewalls and thermo-field dynamics | 7 Pages, 4 figures. This essay received an honorable mention in the
2013 essay competition of the Gravity Research Foundation. v2: References
added | null | 10.1142/S021827181342011X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this essay, we examine the implications of the ongoing black holes vs.
firewalls debate for the thermo-field dynamics of black holes by analyzing a
CFT in a thermal state in the context of AdS/CFT. We argue that the themo-field
doubled copy of the thermal CFT should be thought of not as a fictitious
system, but as... | [
{
"created": "Mon, 27 May 2013 23:38:03 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2013 16:22:57 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Chowdhury",
"Borun D.",
""
]
] | In this essay, we examine the implications of the ongoing black holes vs. firewalls debate for the thermo-field dynamics of black holes by analyzing a CFT in a thermal state in the context of AdS/CFT. We argue that the themo-field doubled copy of the thermal CFT should be thought of not as a fictitious system, but as t... |
0812.0775 | Frank Hellmann | Frank Hellmann | Partial Observables in Extended Systems | 14 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider "unphysical", kinematic observables that do not commute with the
constraints of a gauge system in the context of an extension of the system. We
show that these observables, while not predictable, can nevertheless be said to
have a physical interpretation. They implement Rovelli's concept of partial and
re... | [
{
"created": "Wed, 3 Dec 2008 20:21:31 GMT",
"version": "v1"
}
] | 2008-12-04 | [
[
"Hellmann",
"Frank",
""
]
] | We consider "unphysical", kinematic observables that do not commute with the constraints of a gauge system in the context of an extension of the system. We show that these observables, while not predictable, can nevertheless be said to have a physical interpretation. They implement Rovelli's concept of partial and rela... |
gr-qc/0610106 | Kristin Schleich | J. Brannlund, S. Slobodov, K. Schleich and D. M. Witt | Topological rigidity of dimensional reduction to three dimensions | null | null | null | null | gr-qc | null | Studying spacetimes with continuous symmetries by dimensional reduction to a
lower dimensional spacetime is a well known technique in field theory and
gravity. Recently, its use has been advocated in numerical relativity as an
efficient computational technique for the numerical study of axisymmetric
asymptotically fl... | [
{
"created": "Sat, 21 Oct 2006 19:38:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brannlund",
"J.",
""
],
[
"Slobodov",
"S.",
""
],
[
"Schleich",
"K.",
""
],
[
"Witt",
"D. M.",
""
]
] | Studying spacetimes with continuous symmetries by dimensional reduction to a lower dimensional spacetime is a well known technique in field theory and gravity. Recently, its use has been advocated in numerical relativity as an efficient computational technique for the numerical study of axisymmetric asymptotically flat... |
1803.09204 | Nandan Roy | Nandan Roy, Alma X. Gonzalez-Morales, and L. Arturo Urena-Lopez | New general parametrization of quintessence fields and its observational
constraints | 15 pages, 10 figures | Phys. Rev. D 98, 063530 (2018) | 10.1103/PhysRevD.98.063530 | null | gr-qc astro-ph.CO math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new parameterization of quintessence potentials for dark energy
based directly upon the dynamical properties of the equations of motion. Such
parameterization arises naturally once the equations of motion are written as a
dynamical system in terms of properly defined polar variables. We have
identified t... | [
{
"created": "Sun, 25 Mar 2018 05:13:35 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2018 15:53:41 GMT",
"version": "v2"
}
] | 2018-11-07 | [
[
"Roy",
"Nandan",
""
],
[
"Gonzalez-Morales",
"Alma X.",
""
],
[
"Urena-Lopez",
"L. Arturo",
""
]
] | We present a new parameterization of quintessence potentials for dark energy based directly upon the dynamical properties of the equations of motion. Such parameterization arises naturally once the equations of motion are written as a dynamical system in terms of properly defined polar variables. We have identified two... |
gr-qc/0204090 | Curt Cutler | Curt Cutler and Kip S. Thorne | An Overview of Gravitational-Wave Sources | 40 pages, 5 figures, to appear in Proceedings of GR16 (Durban, South
Africa, 2001) | null | null | null | gr-qc astro-ph | null | We review current best estimates of the strength and detectability of the
gravitational waves from a variety of sources, for both ground-based and
space-based detectors, and we describe the information carried by the waves.
| [
{
"created": "Tue, 30 Apr 2002 10:05:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cutler",
"Curt",
""
],
[
"Thorne",
"Kip S.",
""
]
] | We review current best estimates of the strength and detectability of the gravitational waves from a variety of sources, for both ground-based and space-based detectors, and we describe the information carried by the waves. |
gr-qc/0603077 | Charles Wang | Charles H.-T. Wang | The conformal factor in the parameter-free construction of spin-gauge
variables for gravity | 10 pages | null | null | null | gr-qc math-ph math.MP | null | The newly found conformal decomposition in canonical general relativity is
applied to drastically simplify the recently formulated parameter-free
construction of spin-gauge variables for gravity. The resulting framework
preserves many of the main structures of the existing canonical framework for
loop quantum gravity... | [
{
"created": "Mon, 20 Mar 2006 18:09:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wang",
"Charles H. -T.",
""
]
] | The newly found conformal decomposition in canonical general relativity is applied to drastically simplify the recently formulated parameter-free construction of spin-gauge variables for gravity. The resulting framework preserves many of the main structures of the existing canonical framework for loop quantum gravity r... |
gr-qc/0510079 | Christopher J. Fewster | C.J. Fewster, T.A. Roman | Problems with wormholes which involve arbitrarily small amounts of
exotic matter | 6pp. Contribution to the Proceedings of EPS-13, Bern, 2005, based on
gr-qc/0507013, but with additional remarks on gr-qc/0508060 | null | null | null | gr-qc | null | A quantum inequality bound on the expectation value of the null-contracted
stress tensor in an arbitrary Hadamard state is used to obtain constraints on
the geometries of traversable wormholes. Particular attention is given to the
wormhole models of Visser, Kar, and Dadhich (VKD) and to those of Kuhfittig.
These are ... | [
{
"created": "Mon, 17 Oct 2005 09:36:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fewster",
"C. J.",
""
],
[
"Roman",
"T. A.",
""
]
] | A quantum inequality bound on the expectation value of the null-contracted stress tensor in an arbitrary Hadamard state is used to obtain constraints on the geometries of traversable wormholes. Particular attention is given to the wormhole models of Visser, Kar, and Dadhich (VKD) and to those of Kuhfittig. These are mo... |
1507.02416 | Edward Teo | Yu Chen, Yen-Kheng Lim, Edward Teo | Deformed hyperbolic black holes | 36 pages, 12 figures; v3: added discussion; as accepted for
publication in Phys. Rev. D | Phys. Rev. D 92, 044058 (2015) | 10.1103/PhysRevD.92.044058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes with planar or hyperbolic horizons are known to exist in AdS
space, alongside the usual ones with spherical horizons. In this paper, we
consider a one-parameter generalisation of these black holes that is contained
in the AdS C-metric. In terms of the domain-structure analysis recently
developed for such ... | [
{
"created": "Thu, 9 Jul 2015 08:35:53 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 2015 11:03:40 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Aug 2015 02:55:33 GMT",
"version": "v3"
}
] | 2015-09-09 | [
[
"Chen",
"Yu",
""
],
[
"Lim",
"Yen-Kheng",
""
],
[
"Teo",
"Edward",
""
]
] | Black holes with planar or hyperbolic horizons are known to exist in AdS space, alongside the usual ones with spherical horizons. In this paper, we consider a one-parameter generalisation of these black holes that is contained in the AdS C-metric. In terms of the domain-structure analysis recently developed for such so... |
2005.10133 | Ekaterina Pozdeeva | E.O. Pozdeeva | Generalization of cosmological attractor approach to
Einstein-Gauss-Bonnet gravity | null | Eur.Phys.J.C 80 (2020) 7,612 | 10.1140/epjc/s10052-020-8176-3 | 612 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct models with the Gauss-Bonnet term multiplied to a function of
the scalar field leading to inflationary scenario. The consideration is related
with the slow-roll approximation. The cosmological attractor approach gives the
spectral index of scalar perturbations which is in a good agreement with modern
obs... | [
{
"created": "Wed, 20 May 2020 15:31:00 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 2020 12:07:41 GMT",
"version": "v2"
}
] | 2020-07-29 | [
[
"Pozdeeva",
"E. O.",
""
]
] | We construct models with the Gauss-Bonnet term multiplied to a function of the scalar field leading to inflationary scenario. The consideration is related with the slow-roll approximation. The cosmological attractor approach gives the spectral index of scalar perturbations which is in a good agreement with modern obser... |
2003.14211 | Pardyumn Kumar Sahoo | Snehasish Bhattacharjee, P.K. Sahoo | Comprehensive Analysis of a Non-Singular Bounce in $f(R,T)$ Gravitation | 17 pages, 24 figures, Accepted version at Physics of the dark
Universe | Phys. Dark Universe, 28 (2020) 100537 | 10.1016/j.dark.2020.100537 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper is devoted to the study of bouncing cosmology in $f(R,T)$
modified gravity where we presume $f(R,T) = R + 2 \lambda T$, with $R$ the
Ricci scalar, $T$ the trace of energy momentum tensor and $\lambda$ the model
parameter. We present here a novel parametrization of Hubble parameter which is
apt in re... | [
{
"created": "Sun, 29 Mar 2020 12:01:43 GMT",
"version": "v1"
}
] | 2020-04-07 | [
[
"Bhattacharjee",
"Snehasish",
""
],
[
"Sahoo",
"P. K.",
""
]
] | The present paper is devoted to the study of bouncing cosmology in $f(R,T)$ modified gravity where we presume $f(R,T) = R + 2 \lambda T$, with $R$ the Ricci scalar, $T$ the trace of energy momentum tensor and $\lambda$ the model parameter. We present here a novel parametrization of Hubble parameter which is apt in repr... |
0808.2518 | Victor Flambaum | V.V. Flambaum | Comment on "Black hole constraints on varying fundamental constants" | Comment on arXiv:0706.2188 [PRL 99, 061301] by Jane MacGibbon | Phys.Rev.Lett.102:069001,2009 | 10.1103/PhysRevLett.102.069001 | null | gr-qc astro-ph hep-ph hep-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Letter [1] (also [2]) there is a claim that the generalised second law
of thermodynamics (entropy increase) for black holes provides some limits on
the rate of variation of the fundamental constants of nature (electric charge
e, speed of light c, etc.). We have come to a different conclusion. The results
in [1... | [
{
"created": "Tue, 19 Aug 2008 02:13:15 GMT",
"version": "v1"
}
] | 2009-02-27 | [
[
"Flambaum",
"V. V.",
""
]
] | In the Letter [1] (also [2]) there is a claim that the generalised second law of thermodynamics (entropy increase) for black holes provides some limits on the rate of variation of the fundamental constants of nature (electric charge e, speed of light c, etc.). We have come to a different conclusion. The results in [1,2... |
1611.04143 | Charles Torre | D. S. Krongos and C. G. Torre | Rainich Conditions in (2+1)-Dimensional Gravity | 9 pages | null | 10.1063/1.4974091 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In (3 + 1) spacetime dimensions the Rainich conditions are a set of equations
expressed solely in terms of the metric tensor which are equivalent to the
Einstein-Maxwell equations for non-null electromagnetic fields. Here we provide
the analogous conditions for (2 + 1)-dimensional gravity coupled to
electromagnetism.... | [
{
"created": "Sun, 13 Nov 2016 15:27:18 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Krongos",
"D. S.",
""
],
[
"Torre",
"C. G.",
""
]
] | In (3 + 1) spacetime dimensions the Rainich conditions are a set of equations expressed solely in terms of the metric tensor which are equivalent to the Einstein-Maxwell equations for non-null electromagnetic fields. Here we provide the analogous conditions for (2 + 1)-dimensional gravity coupled to electromagnetism. B... |
0902.0103 | Kiyoshi Shiraishi | Teruki Hanada, Kazuhiko Shinoda and Kiyoshi Shiraishi (Yamaguchi
University) | Cosmology of multigravity | 4 pages, 10 figures. Prepared for the proceedings of JGRG18
(Hiroshima, Japan, 17--21 November 2008). corrected version, references added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have constructed a nonlinear multi-graviton theory. An application of this
theory to cosmology is discussed. We found that scale factors in a solution for
this theory repeat acceleration and deceleration.
| [
{
"created": "Sun, 1 Feb 2009 02:46:50 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2009 01:33:14 GMT",
"version": "v2"
}
] | 2009-02-10 | [
[
"Hanada",
"Teruki",
"",
"Yamaguchi\n University"
],
[
"Shinoda",
"Kazuhiko",
"",
"Yamaguchi\n University"
],
[
"Shiraishi",
"Kiyoshi",
"",
"Yamaguchi\n University"
]
] | We have constructed a nonlinear multi-graviton theory. An application of this theory to cosmology is discussed. We found that scale factors in a solution for this theory repeat acceleration and deceleration. |
gr-qc/0201098 | G. Papini | G. Papini | Parity and Time Reversal in the Spin-Rotation Interaction | 3 pages | Phys.Rev. D65 (2002) 077901 | 10.1103/PhysRevD.65.077901 | null | gr-qc hep-ph | null | A recently reported discrepancy between experimental and theoretical values
of the muon's g-2 factor is interpreted as due to small violations of the
conservation of P and T in the spin-rotation coupling. The experiments place an
upper limit on these violations and on the weight change of spinning
gyroscopes.
| [
{
"created": "Thu, 31 Jan 2002 02:38:46 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2002 20:37:29 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Papini",
"G.",
""
]
] | A recently reported discrepancy between experimental and theoretical values of the muon's g-2 factor is interpreted as due to small violations of the conservation of P and T in the spin-rotation coupling. The experiments place an upper limit on these violations and on the weight change of spinning gyroscopes. |
1909.04789 | Bijan Saha Dr. | K.A. Bronnikov, Yu.P. Rybakov, and Bijan Saha | Spinor fields in spherical symmetry. Einstein-Dirac and other
space-times | 9 pages, 2 figures | The European Physical Journal Plus 135, 124 (2020) | 10.1140/epjp/s13360-020-00150-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the static spherically symmetric Einstein-spinor field system in
the possible presence of various spinor field nonlinearities. We take into
account that the spinor field energy-momentum tensor (EMT) has in general some
off-diagonal components, whose vanishing due to the Einstein equations
substantially aff... | [
{
"created": "Tue, 10 Sep 2019 23:27:22 GMT",
"version": "v1"
}
] | 2020-03-05 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Rybakov",
"Yu. P.",
""
],
[
"Saha",
"Bijan",
""
]
] | We discuss the static spherically symmetric Einstein-spinor field system in the possible presence of various spinor field nonlinearities. We take into account that the spinor field energy-momentum tensor (EMT) has in general some off-diagonal components, whose vanishing due to the Einstein equations substantially affec... |
1207.1055 | Martin Richarte MR | Luis P. Chimento, Mart\'in G. Richarte, and Iv\'an E. S\'anchez G | Form invariance symmetry generates a large set of FRW cosmologies | 11 pages, 3 figures. Accepted for publication in Modern Physics
Letters A (2012) | Modern Physics Letters A Vol. 28, No. 4 (2013) 1250236 (19 pages) | 10.1142/S0217732312502367 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Einstein's field equations for spatially flat
Friedmann-Robertson-Walker (FRW) space times have a form invariance symmetry
(FIS) realized by the form invariance transformations (FIT) which are indeed
generated by an invertible function of the source energy density. These
transformations act on the Hubble... | [
{
"created": "Wed, 4 Jul 2012 16:53:41 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2012 04:49:47 GMT",
"version": "v2"
}
] | 2013-04-01 | [
[
"Chimento",
"Luis P.",
""
],
[
"Richarte",
"Martín G.",
""
],
[
"G",
"Iván E. Sánchez",
""
]
] | We show that Einstein's field equations for spatially flat Friedmann-Robertson-Walker (FRW) space times have a form invariance symmetry (FIS) realized by the form invariance transformations (FIT) which are indeed generated by an invertible function of the source energy density. These transformations act on the Hubble e... |
gr-qc/0601003 | Tomas Ortin | Tomas Ortin (IFT) | Supersymmetry and the Supergravity Landscape | Enlarged version of the talks given at the Pomeranian Workshop on
Cosmology and Fundamental Physics (Pobierowo, Poland) and the 2005 Spanish
Relativity Meeting (in Oviedo, Spain). Latex 2e file, 21 pages, no figures | null | 10.1002/andp.200510185 | IFT-UAM/CSIC-06-01 | gr-qc | null | In the recent times a lot of effort has been devoted to improve our knowledge
about the space of string theory vacua (``the landscape'') to find statistical
grounds to justify how and why the theory selects its vacuum. Particularly
interesting are those vacua that preserve some supersymmetry, which are always
supersy... | [
{
"created": "Sun, 1 Jan 2006 13:30:21 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ortin",
"Tomas",
"",
"IFT"
]
] | In the recent times a lot of effort has been devoted to improve our knowledge about the space of string theory vacua (``the landscape'') to find statistical grounds to justify how and why the theory selects its vacuum. Particularly interesting are those vacua that preserve some supersymmetry, which are always supersymm... |
1612.03299 | Oscar Mauricio Pimentel Diaz | Oscar M. Pimentel, F. D. Lora-Clavijo and Guillermo A. Gonz\'alez | Ideal Magnetohydrodynamics with Radiative Terms: Energy Conditions | 12 pages | Class. Quantum Grav. 34:075008 (2017) | 10.1088/1361-6382/aa61d3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nowadays, the magnetic and radiation fields are very important to understand
the matter accretion into compact objects, the dynamics of binary systems, the
equilibrium configurations of neutron stars, the photon diffusion, etc. The
energy and the momentum associated to these fields, along with the matter one,
need to... | [
{
"created": "Sat, 10 Dec 2016 14:08:14 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2017 15:07:53 GMT",
"version": "v2"
}
] | 2017-04-13 | [
[
"Pimentel",
"Oscar M.",
""
],
[
"Lora-Clavijo",
"F. D.",
""
],
[
"González",
"Guillermo A.",
""
]
] | Nowadays, the magnetic and radiation fields are very important to understand the matter accretion into compact objects, the dynamics of binary systems, the equilibrium configurations of neutron stars, the photon diffusion, etc. The energy and the momentum associated to these fields, along with the matter one, need to s... |
1907.05759 | Sergey Rubin | Arkady A. Popov, Sergey G. Rubin | Evolution of sub-spaces at high and low energies | 20 pages | Eur. Phys. J. C (2019) 79:892 | 10.1140/epjc/s10052-019-7413-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of sub-spaces in the framework of gravity with higher
derivatives is studied. Numerical solutions to exact differential equations are
found. It is shown that the initial conditions play crucial role in the space
dynamic. Appropriate metrics describing an expanding and a stationary sub-space
shed light o... | [
{
"created": "Fri, 12 Jul 2019 14:20:50 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Aug 2019 07:59:24 GMT",
"version": "v2"
}
] | 2020-01-01 | [
[
"Popov",
"Arkady A.",
""
],
[
"Rubin",
"Sergey G.",
""
]
] | The evolution of sub-spaces in the framework of gravity with higher derivatives is studied. Numerical solutions to exact differential equations are found. It is shown that the initial conditions play crucial role in the space dynamic. Appropriate metrics describing an expanding and a stationary sub-space shed light on ... |
gr-qc/9404029 | Charles Torre | C. G. Torre | The Problems of Time and Observables: Some Recent Mathematical Results | Talk presented at the Lanczos Centenary Conference 3 pages, plain TeX | null | null | null | gr-qc | null | We present 2 recent results on the problems of time and observables in
canonical gravity. (1) We cannot use parametrized field theory to solve the
problem of time because, strictly speaking, general relativity is not a
parametrized field theory. (2) We show that there are essentially no local
observables for vacuum s... | [
{
"created": "Thu, 14 Apr 1994 17:44:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Torre",
"C. G.",
""
]
] | We present 2 recent results on the problems of time and observables in canonical gravity. (1) We cannot use parametrized field theory to solve the problem of time because, strictly speaking, general relativity is not a parametrized field theory. (2) We show that there are essentially no local observables for vacuum spa... |
1305.0083 | Ajit Kumar | Srivatsan Rajagopal and Ajit Kumar | Quantization of B-I electrodynamics and B-I modified gravity using
Faddeev-Popov gauge-fixing procedure | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the quantized versions of Born Infeld electrodynamics and Born
Infeld Gravity. We derive Feynman rules for B-I electrodynamics by deriving an
effective Lagrangian with the square root removed using the Faddeev-Popov
method. In the case of B-I gravity, the square root in the Lagrangian is
removed by the... | [
{
"created": "Wed, 1 May 2013 04:51:33 GMT",
"version": "v1"
}
] | 2013-05-02 | [
[
"Rajagopal",
"Srivatsan",
""
],
[
"Kumar",
"Ajit",
""
]
] | We investigate the quantized versions of Born Infeld electrodynamics and Born Infeld Gravity. We derive Feynman rules for B-I electrodynamics by deriving an effective Lagrangian with the square root removed using the Faddeev-Popov method. In the case of B-I gravity, the square root in the Lagrangian is removed by the i... |
2211.06532 | Yuri Bonder | Y. Bonder, J.E. Herrera, A.M. Rubiol | Energy nonconservation and relativistic trajectories: Unimodular gravity
and beyond | 13 pages. Accepted in Phys. Rev. D | Phys. Rev. D 107, 084032 (2023) | 10.1103/PhysRevD.107.084032 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Energy conservation has the status of a fundamental physical principle.
However, measurements in quantum mechanics do not comply with energy
conservation. Therefore, it is expected that a more fundamental theory of
gravity -- one that is less incompatible with quantum mechanics -- should admit
energy nonconservations... | [
{
"created": "Sat, 12 Nov 2022 00:48:49 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Apr 2023 15:58:59 GMT",
"version": "v2"
}
] | 2023-04-19 | [
[
"Bonder",
"Y.",
""
],
[
"Herrera",
"J. E.",
""
],
[
"Rubiol",
"A. M.",
""
]
] | Energy conservation has the status of a fundamental physical principle. However, measurements in quantum mechanics do not comply with energy conservation. Therefore, it is expected that a more fundamental theory of gravity -- one that is less incompatible with quantum mechanics -- should admit energy nonconservations. ... |
gr-qc/0701032 | Farook Rahaman | F.Rahaman, M.Kalam and S. Chakraborty | Wormholes with varying equation of state parameter | A new section has been added and 2 figures are included | Acta Phys.Polon.B40:25-40,2009 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose wormholes solutions by assuming space dependent equation of state
parameter. Our models show that the existence of wormholes is supported by
arbitrary small quantities of averaged null energy condition (ANEC) violating
phantom energy characterized by variable equation state parameter.
| [
{
"created": "Thu, 4 Jan 2007 07:02:04 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2007 09:21:29 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Oct 2008 12:28:18 GMT",
"version": "v3"
}
] | 2009-04-24 | [
[
"Rahaman",
"F.",
""
],
[
"Kalam",
"M.",
""
],
[
"Chakraborty",
"S.",
""
]
] | We propose wormholes solutions by assuming space dependent equation of state parameter. Our models show that the existence of wormholes is supported by arbitrary small quantities of averaged null energy condition (ANEC) violating phantom energy characterized by variable equation state parameter. |
1602.04771 | Diego S\'aez-G\'omez | Diego Saez-Gomez (IA, U. of Lisbon) | Analyzing modified unimodular gravity via Lagrange multipliers | 8 pages. Title changed, some comments added, conclusions unchanged.
Version published in PRD | Phys. Rev. D 93, 124040 (2016) | 10.1103/PhysRevD.93.124040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The so-called unimodular version of General Relativity is revisited.
Unimodular gravity is constructed by fixing the determinant of the metric, what
leads to the trace-free part of the equations instead of the usual Einstein
field equations. Then, a cosmological constant naturally arises as an
integration constant. W... | [
{
"created": "Mon, 15 Feb 2016 19:24:30 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2016 14:58:41 GMT",
"version": "v2"
}
] | 2016-06-22 | [
[
"Saez-Gomez",
"Diego",
"",
"IA, U. of Lisbon"
]
] | The so-called unimodular version of General Relativity is revisited. Unimodular gravity is constructed by fixing the determinant of the metric, what leads to the trace-free part of the equations instead of the usual Einstein field equations. Then, a cosmological constant naturally arises as an integration constant. Whi... |
2205.02615 | Francesco Sartini | Marc Geiller, Etera R. Livine, Francesco Sartini | Dynamical symmetries of homogeneous minisuperspace models | 40 pages | Phys.Rev.D 106 (2022) 6, 064013 | 10.1103/PhysRevD.106.064013 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the phase space symmetries and conserved charges of
homogeneous gravitational minisuperspaces. These (0+1)-dimensional reductions
of general relativity are defined by spacetime metrics in which the dynamical
variables depend only on a time coordinate, and are formulated as mechanical
systems with a non... | [
{
"created": "Thu, 5 May 2022 12:53:35 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Sep 2022 15:14:15 GMT",
"version": "v2"
}
] | 2022-09-12 | [
[
"Geiller",
"Marc",
""
],
[
"Livine",
"Etera R.",
""
],
[
"Sartini",
"Francesco",
""
]
] | We investigate the phase space symmetries and conserved charges of homogeneous gravitational minisuperspaces. These (0+1)-dimensional reductions of general relativity are defined by spacetime metrics in which the dynamical variables depend only on a time coordinate, and are formulated as mechanical systems with a non-t... |
1612.01121 | Gauranga Samanta | G. C. Samanta, R. Myrzakulov and Parth Shah | Kaluza-Klein bulk viscous fluid cosmological models and the validity of
the second law of thermodynamics in $f(R, T)$ gravity | 20 pages, 10 figures. reference added, text clean, abstract modified | null | 10.1515/zna-2016-0472 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The authors considered the bulk viscous fluid in $f(R, T)$ gravity within the
framework of Kaluza-Klein space time. The bulk viscous coefficient $(\xi)$
expressed as $\xi=\xi_0+\xi_1\frac{\dot{a}}{a}+\xi_2\frac{\ddot{a}}{\dot{a}}$,
where $\xi_0$, $\xi_1$ and $\xi_2$ are positive constants. We take
$p=(\gamma-1)\rho$,... | [
{
"created": "Sun, 4 Dec 2016 13:53:28 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Dec 2016 06:58:39 GMT",
"version": "v2"
}
] | 2017-04-26 | [
[
"Samanta",
"G. C.",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Shah",
"Parth",
""
]
] | The authors considered the bulk viscous fluid in $f(R, T)$ gravity within the framework of Kaluza-Klein space time. The bulk viscous coefficient $(\xi)$ expressed as $\xi=\xi_0+\xi_1\frac{\dot{a}}{a}+\xi_2\frac{\ddot{a}}{\dot{a}}$, where $\xi_0$, $\xi_1$ and $\xi_2$ are positive constants. We take $p=(\gamma-1)\rho$, w... |
1711.05212 | Jordan Moxon | Jordan Moxon and \'Eanna Flanagan | Radiation-Reaction Force on a Small Charged Body to Second Order | 31 pages, 2 figures | Phys. Rev. D 97, 105001 (2018) | 10.1103/PhysRevD.97.105001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In classical electrodynamics, an accelerating charged body emits radiation
and experiences a corresponding radiation-reaction force, or self force. We
extend to higher order in the total charge a previous rigorous derivation of
the electromagnetic self force in flat spacetime by Gralla, Harte, and Wald.
The method in... | [
{
"created": "Tue, 14 Nov 2017 17:25:34 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2017 18:23:45 GMT",
"version": "v2"
}
] | 2018-05-09 | [
[
"Moxon",
"Jordan",
""
],
[
"Flanagan",
"Éanna",
""
]
] | In classical electrodynamics, an accelerating charged body emits radiation and experiences a corresponding radiation-reaction force, or self force. We extend to higher order in the total charge a previous rigorous derivation of the electromagnetic self force in flat spacetime by Gralla, Harte, and Wald. The method intr... |
2401.15249 | Hyat Huang | Hyat Huang, Jutta Kunz and Deeshani Mitra | Shadow images of compact objects in beyond Horndeski theory | 28 pages, 18 figures, Comments welcome | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A beyond Horndeski theory is considered that admits wormholes, black holes
and naked singularities. In this theory the shadow images of the black holes
and the exotic compact objects (ECOs), illuminated by an optically and
geometrically thin disk, are investigated. The results show that the three
kinds of objects cas... | [
{
"created": "Fri, 26 Jan 2024 23:52:33 GMT",
"version": "v1"
}
] | 2024-01-30 | [
[
"Huang",
"Hyat",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Mitra",
"Deeshani",
""
]
] | A beyond Horndeski theory is considered that admits wormholes, black holes and naked singularities. In this theory the shadow images of the black holes and the exotic compact objects (ECOs), illuminated by an optically and geometrically thin disk, are investigated. The results show that the three kinds of objects cast ... |
gr-qc/9808049 | Marcelo Jose Reboucas | M.J. Reboucas and A.F.F. Teixeira | Causal Anomalies in Kaluza-Klein Gravity Theories | 16 page. LaTex file. To appear in Int. J. Mod. Phys. A (1998) | Int.J.Mod.Phys. A13 (1998) 3181-3192 | 10.1142/S0217751X98001578 | CBPF-NF-060/97 | gr-qc astro-ph | null | Causal anomalies in two Kaluza-Klein gravity theories are examined,
particularly as to whether these theories permit solutions in which the
causality principle is violated. It is found that similarly to general
relativity the field equations of the space-time-mass Kaluza-Klein (STM-KK)
gravity theory do not exclude v... | [
{
"created": "Tue, 18 Aug 1998 20:46:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Reboucas",
"M. J.",
""
],
[
"Teixeira",
"A. F. F.",
""
]
] | Causal anomalies in two Kaluza-Klein gravity theories are examined, particularly as to whether these theories permit solutions in which the causality principle is violated. It is found that similarly to general relativity the field equations of the space-time-mass Kaluza-Klein (STM-KK) gravity theory do not exclude vio... |
1011.5272 | Kouji Nakamura | Kouji Nakamura | General formulation of general-relativistic higher-order gauge-invariant
perturbation theory | 4 pages, no figure. (v3) some explanations are added and a reference
is added | Class. Quantum Grav. vol.28, 122001, (2011) | 10.1088/0264-9381/28/12/122001 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gauge-invariant treatments of general-relativistic higher-order perturbations
on generic background spacetime is proposed. After reviewing the general
framework of the second-order gauge-invariant perturbation theory, we show the
fact that the linear-order metric perturbation is decomposed into
gauge-invariant and ga... | [
{
"created": "Wed, 24 Nov 2010 02:12:09 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jan 2011 06:46:20 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Feb 2011 01:45:57 GMT",
"version": "v3"
}
] | 2012-05-24 | [
[
"Nakamura",
"Kouji",
""
]
] | Gauge-invariant treatments of general-relativistic higher-order perturbations on generic background spacetime is proposed. After reviewing the general framework of the second-order gauge-invariant perturbation theory, we show the fact that the linear-order metric perturbation is decomposed into gauge-invariant and gaug... |
1707.07729 | Abhay Ashtekar | Abhay Ashtekar and B\'eatrice Bonga | On a basic conceptual confusion in gravitational radiation theory | 8 pages. Some references added and minor changes made to add clarity | Class. Quantum Grav. 34, 20LT01(7pages) (2017) | 10.1088/1361-6382/aa88e2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In much of the literature on linearized gravitational waves two completely
different notions are called transverse traceless modes and labelled
$h_{ab}^{TT}$, often in different sections of the same reference, without
realizing the underlying inconsistency. We compare and contrast the two notions
and find that the di... | [
{
"created": "Mon, 24 Jul 2017 19:49:22 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2017 02:25:36 GMT",
"version": "v2"
}
] | 2017-09-22 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Bonga",
"Béatrice",
""
]
] | In much of the literature on linearized gravitational waves two completely different notions are called transverse traceless modes and labelled $h_{ab}^{TT}$, often in different sections of the same reference, without realizing the underlying inconsistency. We compare and contrast the two notions and find that the diff... |
1812.03834 | Tanwi Bandyopadhyay | Tanwi Bandyopadhyay and Ujjal Debnath | Bouncing Universe in the Contexts of Generalized Cosmic Chaplygin Gas
and Variable Modified Chaplygin Gas | 16 pages, 29 figures | null | 10.1139/cjp-2017-1008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have considered the Friedmann-Robertson-Walker (FRW) model
of the universe where bounce occurs and the universe is filled with Generalized
Cosmic Chaplygin Gas (GCCG) or Variable Modified Chaplygin Gas (VMCG). We have
studied the stability analysis through dynamical system for both models and
found t... | [
{
"created": "Thu, 6 Dec 2018 05:42:31 GMT",
"version": "v1"
}
] | 2018-12-11 | [
[
"Bandyopadhyay",
"Tanwi",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this work, we have considered the Friedmann-Robertson-Walker (FRW) model of the universe where bounce occurs and the universe is filled with Generalized Cosmic Chaplygin Gas (GCCG) or Variable Modified Chaplygin Gas (VMCG). We have studied the stability analysis through dynamical system for both models and found the... |
2101.04212 | Nikodem Poplawski | Nikodem Pop{\l}awski | Relativistic wave--particle duality for spinors | 6 pages | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | We propose that relativistic wave--particle duality can be embodied in a
relation $\langle u^i\rangle=\bar{\psi}\gamma^i\psi/\bar{\psi}\psi$, which
determines the mean four-velocity of the fermion particle associated with a
Dirac wave function. We use the Einstein--Cartan theory of gravity with
torsion, which incorpo... | [
{
"created": "Mon, 11 Jan 2021 22:06:27 GMT",
"version": "v1"
}
] | 2021-01-14 | [
[
"Popławski",
"Nikodem",
""
]
] | We propose that relativistic wave--particle duality can be embodied in a relation $\langle u^i\rangle=\bar{\psi}\gamma^i\psi/\bar{\psi}\psi$, which determines the mean four-velocity of the fermion particle associated with a Dirac wave function. We use the Einstein--Cartan theory of gravity with torsion, which incorpora... |
2202.05105 | Alexander C. Jenkins | Alexander C. Jenkins | Cosmology and Fundamental Physics in the Era of Gravitational-Wave
Astronomy | PhD thesis, 299 pages, 67 figures, references updated | null | null | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The advent of gravitational-wave (GW) astronomy has presented us with a
completely new means for observing the Universe, allowing us to probe its
structure and evolution like never before. In this thesis, we explore three
distinct but complementary avenues for using GW observations to gain new
insights into cosmology... | [
{
"created": "Thu, 10 Feb 2022 15:47:14 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2022 18:27:40 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Jenkins",
"Alexander C.",
""
]
] | The advent of gravitational-wave (GW) astronomy has presented us with a completely new means for observing the Universe, allowing us to probe its structure and evolution like never before. In this thesis, we explore three distinct but complementary avenues for using GW observations to gain new insights into cosmology a... |
gr-qc/0005133 | Nicholas G. Phillips | Nicholas. G. Phillips, B. L. Hu | Vacuum Energy Density Fluctuations in Minkowski and Casimir States via
Smeared Quantum Fields and Point Separation | 41 pages, 2 figures | Phys.Rev. D62 (2000) 084017 | 10.1103/PhysRevD.62.084017 | null | gr-qc | null | We present calculations of the variance of fluctuations and of the mean of
the energy momentum tensor of a massless scalar field for the Minkowski and
Casimir vacua as a function of an intrinsic scale defined by a smeared field or
by point separation. We point out that contrary to prior claims, the ratio of
variance ... | [
{
"created": "Wed, 31 May 2000 15:08:34 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Phillips",
"Nicholas. G.",
""
],
[
"Hu",
"B. L.",
""
]
] | We present calculations of the variance of fluctuations and of the mean of the energy momentum tensor of a massless scalar field for the Minkowski and Casimir vacua as a function of an intrinsic scale defined by a smeared field or by point separation. We point out that contrary to prior claims, the ratio of variance to... |
0912.3606 | Hirotaka Yoshino | Masaru Shibata, Hirotaka Yoshino | Nonaxisymmetric instability of rapidly rotating black hole in five
dimensions | 4 pages, 3 figures, accepted for publication in PRD(R) | Phys.Rev.D81:021501,2010 | 10.1103/PhysRevD.81.021501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results from numerical solution of Einstein's equation in five
dimensions describing evolution of rapidly rotating black holes. We show, for
the first time, that the rapidly rotating black holes in higher dimensions are
unstable against nonaxisymmetric deformation; for the five-dimensional case,
the critic... | [
{
"created": "Fri, 18 Dec 2009 08:21:18 GMT",
"version": "v1"
}
] | 2010-04-14 | [
[
"Shibata",
"Masaru",
""
],
[
"Yoshino",
"Hirotaka",
""
]
] | We present results from numerical solution of Einstein's equation in five dimensions describing evolution of rapidly rotating black holes. We show, for the first time, that the rapidly rotating black holes in higher dimensions are unstable against nonaxisymmetric deformation; for the five-dimensional case, the critical... |
1812.01542 | Carlo Rovelli | Marios Christodoulou, Carlo Rovelli | On the possibility of experimental detection of the discreteness of time | 4 pages, 2 figures | Frontiers in Physics, 8 (2020) 20 | 10.3389/fphy.2020.00207 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bose-Marletto-Vedral experiment tests a non-relativistic quantum effect
due to a gravitational interaction. It has received attention because it may
soon be within observational reach in the lab. We observe here that: (i) in
relativistic language the experiment tests an interference effect between
proper-time int... | [
{
"created": "Tue, 4 Dec 2018 17:20:20 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Dec 2018 22:20:48 GMT",
"version": "v2"
}
] | 2020-11-24 | [
[
"Christodoulou",
"Marios",
""
],
[
"Rovelli",
"Carlo",
""
]
] | The Bose-Marletto-Vedral experiment tests a non-relativistic quantum effect due to a gravitational interaction. It has received attention because it may soon be within observational reach in the lab. We observe here that: (i) in relativistic language the experiment tests an interference effect between proper-time inter... |
2403.05667 | Gil de Oliveira-Neto | G. Oliveira-Neto, A. Oliveira Castro J\'unior and G. A. Monerat | Primordial dust universe in the Ho\v{r}ava-Lifshitz theory | The paper has 13 pages and 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply quantum cosmology to investigate the early moments of a
Friedmann-Lema\^itre-Robertson-Walker (FLRW) cosmological model, using
Ho\v{r}ava-Lifshitz (HL) as the gravitational theory. The matter content of the
model is a dust perfect fluid. We start studying the classical model. Then, we
write the total Hamilto... | [
{
"created": "Fri, 8 Mar 2024 20:43:57 GMT",
"version": "v1"
}
] | 2024-03-12 | [
[
"Oliveira-Neto",
"G.",
""
],
[
"Júnior",
"A. Oliveira Castro",
""
],
[
"Monerat",
"G. A.",
""
]
] | We apply quantum cosmology to investigate the early moments of a Friedmann-Lema\^itre-Robertson-Walker (FLRW) cosmological model, using Ho\v{r}ava-Lifshitz (HL) as the gravitational theory. The matter content of the model is a dust perfect fluid. We start studying the classical model. Then, we write the total Hamiltoni... |
1410.1413 | Abraao Capistrano | Abraao J.S. Capistrano, Luiz A. Cabral | Evolving extrinsic curvature and the cosmological constant problem | 7 pages, 2 figures | Physica Scripta, v. 91, p. 105001, 2016 | 10.1088/0031-8949/91/10/105001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of smooth deformation of Riemannian manifolds associated with the
extrinsic curvature is explained and applied to the FLRW cosmology. We show
that such deformation can be derived from Einstein-Hilbert-like dynamical
principle producing an observable effect in the sense of Noether. As a result,
we notice o... | [
{
"created": "Thu, 2 Oct 2014 20:42:57 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2015 18:52:07 GMT",
"version": "v2"
}
] | 2017-04-06 | [
[
"Capistrano",
"Abraao J. S.",
""
],
[
"Cabral",
"Luiz A.",
""
]
] | The concept of smooth deformation of Riemannian manifolds associated with the extrinsic curvature is explained and applied to the FLRW cosmology. We show that such deformation can be derived from Einstein-Hilbert-like dynamical principle producing an observable effect in the sense of Noether. As a result, we notice on ... |
gr-qc/0607042 | T. Padmanabhan | Sudipta Sarkar, T. Padmanabhan | Thermodynamics of horizons from a dual quantum system | 5 pages; no figures | Entropy 9:100-107,2007 | 10.3390/e9030100 | null | gr-qc | null | It was shown recently that, in the case of Schwarschild black hole, one can
obtain the correct thermodynamic relations by studying a model quantum system
and using a particular duality transformation. We study this approach further
for the case a general spherically symmetric horizon. We show that the idea
works for ... | [
{
"created": "Tue, 11 Jul 2006 05:27:26 GMT",
"version": "v1"
}
] | 2009-03-19 | [
[
"Sarkar",
"Sudipta",
""
],
[
"Padmanabhan",
"T.",
""
]
] | It was shown recently that, in the case of Schwarschild black hole, one can obtain the correct thermodynamic relations by studying a model quantum system and using a particular duality transformation. We study this approach further for the case a general spherically symmetric horizon. We show that the idea works for a ... |
1011.2455 | Ernesto F. Eiroa | Ernesto F. Eiroa, Carlos M. Sendra | Gravitational lensing by a regular black hole | 10 pages, 4 figures. v2: Improved version, new references added | Class.Quant.Grav.28:085008,2011 | 10.1088/0264-9381/28/8/085008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study a regular Bardeen black hole as a gravitational lens.
We find the strong deflection limit for the deflection angle, from which we
obtain the positions and magnifications of the relativistic images. As an
example, we apply the results to the particular case of the supermassive black
hole at the... | [
{
"created": "Wed, 10 Nov 2010 18:38:37 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 2011 20:32:48 GMT",
"version": "v2"
}
] | 2011-03-29 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"Sendra",
"Carlos M.",
""
]
] | In this paper, we study a regular Bardeen black hole as a gravitational lens. We find the strong deflection limit for the deflection angle, from which we obtain the positions and magnifications of the relativistic images. As an example, we apply the results to the particular case of the supermassive black hole at the c... |
gr-qc/0411001 | Piotr Bizon | Piotr Bizo\'n, Arthur Wasserman | A note on the non-existence of $\sigma$-model solitons in the 2+1
dimensional AdS gravity | null | Phys.Rev. D71 (2005) 108701 | 10.1103/PhysRevD.71.108701 | null | gr-qc | null | We show that the gravitating static soliton in the 2+1 dimensional O(3)
$\sigma$ model does not exist in the presence of a negative cosmological
constant.
| [
{
"created": "Fri, 29 Oct 2004 20:36:30 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bizoń",
"Piotr",
""
],
[
"Wasserman",
"Arthur",
""
]
] | We show that the gravitating static soliton in the 2+1 dimensional O(3) $\sigma$ model does not exist in the presence of a negative cosmological constant. |
gr-qc/9912026 | Michele Vallisneri | Michele Vallisneri | Prospects for gravitational-wave observations of neutron-star tidal
disruption in neutron-star/black-hole binaries | RevTeX, 4 pages, 2 EPS figures. Revised slightly, corrected typos | Phys.Rev.Lett. 84 (2000) 3519 | 10.1103/PhysRevLett.84.3519 | null | gr-qc astro-ph | null | For an inspiraling neutron-star/black-hole binary (NS/BH), we estimate the
gravity-wave frequency f_td at the onset of NS tidal disruption. We model the
NS as a tidally distorted, homogeneous, Newtonian ellipsoid on a circular,
equatorial geodesic around a Kerr BH. We find that f_td depends strongly on the
NS radius ... | [
{
"created": "Wed, 8 Dec 1999 01:26:37 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2000 18:47:59 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Vallisneri",
"Michele",
""
]
] | For an inspiraling neutron-star/black-hole binary (NS/BH), we estimate the gravity-wave frequency f_td at the onset of NS tidal disruption. We model the NS as a tidally distorted, homogeneous, Newtonian ellipsoid on a circular, equatorial geodesic around a Kerr BH. We find that f_td depends strongly on the NS radius R,... |
2007.13980 | Indrani Banerjee | Indrani Banerjee, Bhaswati Mandal and Soumitra SenGupta | Implications of Einstein-Maxwell dilaton-axion gravity from the black
hole continuum spectrum | 14 pages, 6 figures, 1 Table (accepted for publication in MNRAS) | null | 10.1093/mnras/staa3232 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | String inspired models can serve as potential candidates to replace GR in the
high energy regime where quantum gravity is expected to play a vital role. Such
models not only subsume the ultraviolet nature of gravity but also exhibit
promising prospects in resolving issues like dark matter and dark energy, which
canno... | [
{
"created": "Tue, 28 Jul 2020 04:06:57 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Oct 2020 11:16:11 GMT",
"version": "v2"
}
] | 2020-10-29 | [
[
"Banerjee",
"Indrani",
""
],
[
"Mandal",
"Bhaswati",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | String inspired models can serve as potential candidates to replace GR in the high energy regime where quantum gravity is expected to play a vital role. Such models not only subsume the ultraviolet nature of gravity but also exhibit promising prospects in resolving issues like dark matter and dark energy, which cannot ... |
1202.3688 | Julien Cortier | Julien Cortier | Gluing construction of initial data with Kerr-de Sitter ends | 27 pages, 3 figures | null | 10.1007/s00023-012-0210-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct initial data sets which satisfy the vacuum constraint equa-
tions of General Relativity with positive cosmologigal constant. More pre-
silely, we deform initial data with ends asymptotic to Schwarzschild-de Sitter
to obtain non-trivial initial data with exactly Kerr-de Sitter ends. The method
is inspired... | [
{
"created": "Thu, 16 Feb 2012 20:19:50 GMT",
"version": "v1"
}
] | 2018-03-28 | [
[
"Cortier",
"Julien",
""
]
] | We construct initial data sets which satisfy the vacuum constraint equa- tions of General Relativity with positive cosmologigal constant. More pre- silely, we deform initial data with ends asymptotic to Schwarzschild-de Sitter to obtain non-trivial initial data with exactly Kerr-de Sitter ends. The method is inspired f... |
gr-qc/9812019 | Keith H. Lockitch | Keith H. Lockitch and John L. Friedman | Where are the r-modes of isentropic stars? | 54 pages including 4 ps tables and 11 PSTeX figures, AAS latex. To
appear in the Astrophysical Journal | Astrophys.J. 521 (1999) 764 | 10.1086/307580 | WISC-MILW-98-TH-21 | gr-qc astro-ph | null | Almost none of the r-modes ordinarily found in rotating stars exist, if the
star and its perturbations obey the same one-parameter equation of state; and
rotating relativistic stars with one-parameter equations of state have no pure
r-modes at all, no modes whose limit, for a star with zero angular velocity, is
a per... | [
{
"created": "Sat, 5 Dec 1998 00:59:02 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Dec 1998 01:30:28 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jan 1999 23:04:24 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Mar 1999 20:59:28 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Lockitch",
"Keith H.",
""
],
[
"Friedman",
"John L.",
""
]
] | Almost none of the r-modes ordinarily found in rotating stars exist, if the star and its perturbations obey the same one-parameter equation of state; and rotating relativistic stars with one-parameter equations of state have no pure r-modes at all, no modes whose limit, for a star with zero angular velocity, is a pertu... |
1801.00867 | Cosimo Bambi | Honghui Liu, Menglei Zhou, Cosimo Bambi | Distinguishing black holes and naked singularities with iron line
spectroscopy | 1+15 pages, 4 figures. v2: refereed version | JCAP 1808:044 (2018) | 10.1088/1475-7516/2018/08/044 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is commonly thought that the final product of gravitational collapse is a
black hole. Nevertheless, theoretical studies have not yet provided a final
answer to the question whether black holes are the only possible outcome or
whether naked singularities are also allowed. Observational tests may thus
represent a co... | [
{
"created": "Wed, 3 Jan 2018 00:13:32 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2018 14:40:57 GMT",
"version": "v2"
}
] | 2018-08-31 | [
[
"Liu",
"Honghui",
""
],
[
"Zhou",
"Menglei",
""
],
[
"Bambi",
"Cosimo",
""
]
] | It is commonly thought that the final product of gravitational collapse is a black hole. Nevertheless, theoretical studies have not yet provided a final answer to the question whether black holes are the only possible outcome or whether naked singularities are also allowed. Observational tests may thus represent a comp... |
2312.15505 | Asier Alonso-Bardaji | Asier Alonso-Bardaji and David Brizuela | Nonsingular collapse of a spherical dust cloud | 1 figure. Small clarifications and a brief comparison with previous
related models. Version matching the published paper | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a covariant framework to study singularity-free
Lema\^itre-Tolman-Bondi spacetimes with effective corrections motivated by loop
quantum gravity. We show that, as in general relativity, physically reasonable
energy distributions lead to a contraction of the dust shells. However,
quantum-gravity effects even... | [
{
"created": "Sun, 24 Dec 2023 15:14:01 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2024 16:48:22 GMT",
"version": "v2"
}
] | 2024-03-07 | [
[
"Alonso-Bardaji",
"Asier",
""
],
[
"Brizuela",
"David",
""
]
] | We provide a covariant framework to study singularity-free Lema\^itre-Tolman-Bondi spacetimes with effective corrections motivated by loop quantum gravity. We show that, as in general relativity, physically reasonable energy distributions lead to a contraction of the dust shells. However, quantum-gravity effects eventu... |
1201.5599 | Micha{\l} W{\ka}s | Michal Was, Patrick J. Sutton, Gareth Jones, Isabel Leonor | Performance of an externally triggered gravitational-wave burst search | 9 pages, 5 figures, accepted by PRD | Phys. Rev. D 86, 022003 (2012) | 10.1103/PhysRevD.86.022003 | LIGO-P1100135 | gr-qc physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the performance of searches for gravitational wave bursts
associated with external astrophysical triggers as a function of the search sky
region. We discuss both the case of Gaussian noise and real noise of
gravitational wave detectors for arbitrary detector networks. We demonstrate
the ability to reach Ga... | [
{
"created": "Thu, 26 Jan 2012 18:32:43 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2012 13:37:19 GMT",
"version": "v2"
}
] | 2012-08-01 | [
[
"Was",
"Michal",
""
],
[
"Sutton",
"Patrick J.",
""
],
[
"Jones",
"Gareth",
""
],
[
"Leonor",
"Isabel",
""
]
] | We present the performance of searches for gravitational wave bursts associated with external astrophysical triggers as a function of the search sky region. We discuss both the case of Gaussian noise and real noise of gravitational wave detectors for arbitrary detector networks. We demonstrate the ability to reach Gaus... |
2303.10348 | Merab Gogberashvili Prof | Merab Gogberashvili | Einstein's hole argument and Schwarzschild singularities | 13 pages, no figures | Ann. Phys. 452 (2023) 169274 | 10.1016/j.aop.2023.169274 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the Einstein hole argument, vacuum metric solutions are
equivalent only if they correspond to the same energy--momentum tensor in the
source region. In this paper it is shown that singular coordinates that are
used to show Schwarzschild geodesics completeness, introduce the fictive
delta-like sources at ... | [
{
"created": "Sat, 18 Mar 2023 06:50:50 GMT",
"version": "v1"
}
] | 2023-03-21 | [
[
"Gogberashvili",
"Merab",
""
]
] | According to the Einstein hole argument, vacuum metric solutions are equivalent only if they correspond to the same energy--momentum tensor in the source region. In this paper it is shown that singular coordinates that are used to show Schwarzschild geodesics completeness, introduce the fictive delta-like sources at th... |
2404.07257 | Nuno M. Santos | Nuno M. Santos, Carolina L. Benone, Carlos A. R. Herdeiro | Radial stability of spherical bosonic stars and critical points | 23 pages, 8 figures and 6 tables | JCAP 06 (2024) 068 | 10.1088/1475-7516/2024/06/068 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study radial perturbations of spherically symmetric spin-$0$ and spin-$1$
bosonic stars, computing numerically the squared frequency of the fundamental
mode. We find that not all critical points $-$ where the Arnowitt-Deser-Misner
mass attains an extremum $-$ correspond to zero modes. Thus, radial stability
does n... | [
{
"created": "Wed, 10 Apr 2024 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2024 17:23:29 GMT",
"version": "v2"
},
{
"created": "Mon, 27 May 2024 12:19:51 GMT",
"version": "v3"
}
] | 2024-07-01 | [
[
"Santos",
"Nuno M.",
""
],
[
"Benone",
"Carolina L.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
]
] | We study radial perturbations of spherically symmetric spin-$0$ and spin-$1$ bosonic stars, computing numerically the squared frequency of the fundamental mode. We find that not all critical points $-$ where the Arnowitt-Deser-Misner mass attains an extremum $-$ correspond to zero modes. Thus, radial stability does not... |
0912.1938 | Hrvoje Nikolic | H. Nikolic | The Spacetime View of the Information Paradox | 7 pages, revised, to appear in Int. J. Quantum Inf | Int. J. Quantum Inf. 10, 1250024 (2012) | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In semiclassical gravity, the final state of black-hole evaporation cannot be
described by a pure state. Nevertheless, we point out that the system can be
described by a generalized pure state, which is not defined on a 3-dimensional
hypersurface but on the 4-dimensional spacetime describing the whole Universe
at all... | [
{
"created": "Thu, 10 Dec 2009 08:48:47 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2011 09:56:04 GMT",
"version": "v2"
}
] | 2012-04-12 | [
[
"Nikolic",
"H.",
""
]
] | In semiclassical gravity, the final state of black-hole evaporation cannot be described by a pure state. Nevertheless, we point out that the system can be described by a generalized pure state, which is not defined on a 3-dimensional hypersurface but on the 4-dimensional spacetime describing the whole Universe at all t... |
1709.09742 | F\'elix-Louis Juli\'e | F\'elix-Louis Juli\'e | Reducing the two-body problem in scalar-tensor theories to the motion of
a test particle : a scalar-tensor effective-one-body approach | null | Phys. Rev. D 97, 024047 (2018) | 10.1103/PhysRevD.97.024047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from the second post-Keplerian (2PK) Hamiltonian describing the
conservative part of the two-body dynamics in massless scalar-tensor (ST)
theories, we build an effective-one-body (EOB) Hamiltonian which is a
$\nu$-deformation (where $\nu= 0$ is the test mass limit) of the analytically
known ST Hamiltonian of... | [
{
"created": "Wed, 27 Sep 2017 21:43:48 GMT",
"version": "v1"
}
] | 2018-02-07 | [
[
"Julié",
"Félix-Louis",
""
]
] | Starting from the second post-Keplerian (2PK) Hamiltonian describing the conservative part of the two-body dynamics in massless scalar-tensor (ST) theories, we build an effective-one-body (EOB) Hamiltonian which is a $\nu$-deformation (where $\nu= 0$ is the test mass limit) of the analytically known ST Hamiltonian of a... |
1511.05821 | Philippe Spindel | Thibault Damour, Philippe Spindel | Minisuperspace quantum supersymmetric cosmology (and its hidden
hyperbolic Kac-Moody structures) | Proceedings Fourteenth Marcel Grossmann Meeting - Rome, July 12-18,
2015 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work summarises recent progress obtained by the mini-superpspace
quantization of $\mathcal N=1$, $d=4$ supergravity, formulated in the framework
of the Bianchi IX cosmological model. The emphasis is put on three main results
: the completeness of the solution space obtained, the elements suggesting a
hidden Kac-... | [
{
"created": "Wed, 18 Nov 2015 14:59:24 GMT",
"version": "v1"
}
] | 2015-11-19 | [
[
"Damour",
"Thibault",
""
],
[
"Spindel",
"Philippe",
""
]
] | This work summarises recent progress obtained by the mini-superpspace quantization of $\mathcal N=1$, $d=4$ supergravity, formulated in the framework of the Bianchi IX cosmological model. The emphasis is put on three main results : the completeness of the solution space obtained, the elements suggesting a hidden Kac-Mo... |
0709.3652 | Nikodem Poplawski | Nikodem J. Poplawski | Massive vectors from projective-invariance breaking | 11 pages; published version. Invited article in special issue on
torsion (V. Dvoeglazov, ed.) | Ann. Fond. Louis de Broglie 32 (2007) 335-353 | null | null | gr-qc hep-th math-ph math.MP | null | A general affine connection has enough degrees of freedom to describe the
classical gravitational and electromagnetic fields in the metric-affine
formulation of gravity. The gravitational field is represented in the
Lagrangian by the symmetric part of the Ricci tensor and the classical
electromagnetic field can be re... | [
{
"created": "Sun, 23 Sep 2007 18:37:21 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Mar 2008 18:24:07 GMT",
"version": "v2"
}
] | 2008-03-02 | [
[
"Poplawski",
"Nikodem J.",
""
]
] | A general affine connection has enough degrees of freedom to describe the classical gravitational and electromagnetic fields in the metric-affine formulation of gravity. The gravitational field is represented in the Lagrangian by the symmetric part of the Ricci tensor and the classical electromagnetic field can be repr... |
gr-qc/9912021 | Roustam M. Zalaletdinov | Roustam Zalaletdinov (International Center for Relativistic
Astrophysics, Universit\'a di Roma "La Sapienza", Roma and Department of
Theoretical Physics, Institute of Nuclear Physics, Tashkent) | Approximate Symmetries in General Relativity | 15 pages, LaTeX, extended version (including a review on the subject)
of the paper "Approximate Symmetries, Inhomogeneous Spaces and Gravitational
Entropy", to appear in Proc. of the Second ICRA Network Workshop "The Chaotic
Universe", eds. V. Gurzadyan and R. Ruffini (World Scientific, Singapore,
2000) | Proc. of the 2nd ICRA Network Workshop "The Chaotic Universe",
Rome-Pescara, February 1999, eds. V. Gurzadyan and R. Ruffini (World
Scientific, Singapore, 2000), p. 619635 | null | null | gr-qc | null | The problem of finding an appropriate geometrical/physical index for
measuring a degree of inhomogeneity for a given space-time manifold is posed.
Interrelations with the problem of understanding the
gravitational/informational entropy are pointed out. An approach based on the
notion of approximate symmetry is propos... | [
{
"created": "Tue, 7 Dec 1999 14:00:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zalaletdinov",
"Roustam",
"",
"International Center for Relativistic\n Astrophysics, Universitá di Roma \"La Sapienza\", Roma and Department of\n Theoretical Physics, Institute of Nuclear Physics, Tashkent"
]
] | The problem of finding an appropriate geometrical/physical index for measuring a degree of inhomogeneity for a given space-time manifold is posed. Interrelations with the problem of understanding the gravitational/informational entropy are pointed out. An approach based on the notion of approximate symmetry is proposed... |
2102.03972 | Chao Zhang | Chao Zhang, Yungui Gong, Dicong Liang and Chunyu Zhang | Detection of gravitational wave mixed polarization with single
space-based detectors | 29 pages, 12 figures, 1 table. (PRD received) | null | 10.1103/PhysRevD.105.104062 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity predicts only two tensor polarization modes for
gravitational waves while at most six possible polarization modes are allowed
in general metric theory of gravity. The number of polarization modes is
determined by the specific modified theory of gravity. Therefore, the
determination of polarization ... | [
{
"created": "Mon, 8 Feb 2021 02:50:35 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 2021 05:04:29 GMT",
"version": "v2"
},
{
"created": "Sat, 28 May 2022 03:18:19 GMT",
"version": "v3"
}
] | 2022-06-08 | [
[
"Zhang",
"Chao",
""
],
[
"Gong",
"Yungui",
""
],
[
"Liang",
"Dicong",
""
],
[
"Zhang",
"Chunyu",
""
]
] | General Relativity predicts only two tensor polarization modes for gravitational waves while at most six possible polarization modes are allowed in general metric theory of gravity. The number of polarization modes is determined by the specific modified theory of gravity. Therefore, the determination of polarization mo... |
1502.07128 | Avirup Ghosh | Ayan Chatterjee, Avirup Ghosh | Quasilocal rotating conformal Killing horizons | 15 pages. sequel to arXiv:1412.5115. Definition slightly modified, an
appendix added | Phys. Rev. D 92, 044003 (2015) | 10.1103/PhysRevD.92.044003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formulation of quasi-local conformal Killling horizons(CKH) is extended
to include rotation. This necessitates that the horizon be foliated by
2-spheres which may be distorted. Matter degrees of freedom which fall through
the horizon is taken to be a real scalar field. We show that these rotating
CKHs also admit ... | [
{
"created": "Wed, 25 Feb 2015 11:19:25 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2015 16:35:07 GMT",
"version": "v2"
}
] | 2015-08-04 | [
[
"Chatterjee",
"Ayan",
""
],
[
"Ghosh",
"Avirup",
""
]
] | The formulation of quasi-local conformal Killling horizons(CKH) is extended to include rotation. This necessitates that the horizon be foliated by 2-spheres which may be distorted. Matter degrees of freedom which fall through the horizon is taken to be a real scalar field. We show that these rotating CKHs also admit a ... |
2404.10456 | Chao Zhang | Chao Zhang, Tao Zhu | Linear instability of hairy black holes in Horndeski theory | 7 pages, 1 figure | null | 10.1088/1674-1137/ad3eff | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Horndeski theory constitutes the most general model of scalar-tensor
theories. It has attracted much attention in recent years in relation with
black holes, celestial dynamics, stability analysis, etc. It is important to
note that, for certain subclasses of Horndeski models, one can obtain analytic
solutions for the ... | [
{
"created": "Tue, 16 Apr 2024 10:53:25 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jul 2024 16:47:59 GMT",
"version": "v2"
}
] | 2024-07-16 | [
[
"Zhang",
"Chao",
""
],
[
"Zhu",
"Tao",
""
]
] | Horndeski theory constitutes the most general model of scalar-tensor theories. It has attracted much attention in recent years in relation with black holes, celestial dynamics, stability analysis, etc. It is important to note that, for certain subclasses of Horndeski models, one can obtain analytic solutions for the ba... |
1512.04874 | Anil Yadav dr | Ahmad T Ali, Anil Kumar Yadav and Abdulah K Alzahrani | Similarity dark energy models in Bianchi type - I space-time | 10 pages, 2 figure panels, Textual changes and References updated | Eur. Phys. J. Plus 131, 415 (2016) | 10.1140/epjp/i2016-16415-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate some new similarity inhomogeneous solutions of anisotropic
dark energy and perfect fluid in Bianchi type-I space-time. Three different
equation of state parameters along the spatial directions are introduced to
quantify the deviation of pressure from isotropy. We consider the case when the
dark energy ... | [
{
"created": "Mon, 7 Dec 2015 22:52:37 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2016 16:11:07 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Feb 2016 16:03:28 GMT",
"version": "v3"
},
{
"created": "Tue, 10 Apr 2018 11:31:54 GMT",
"version": "v4"
},
{
"cre... | 2018-04-12 | [
[
"Ali",
"Ahmad T",
""
],
[
"Yadav",
"Anil Kumar",
""
],
[
"Alzahrani",
"Abdulah K",
""
]
] | We investigate some new similarity inhomogeneous solutions of anisotropic dark energy and perfect fluid in Bianchi type-I space-time. Three different equation of state parameters along the spatial directions are introduced to quantify the deviation of pressure from isotropy. We consider the case when the dark energy is... |
gr-qc/9504037 | Cenalo Vaz | Cenalo Vaz and Louis Witten | Soliton Induced Singularities in 2 d Gravity and their Evaporation | 15 pages (37.7 kb), PHYZZX. Figures available from authors. | Class.Quant.Grav.12:2607-2618,1995 | 10.1088/0264-9381/12/10/017 | UATP-95/02 | gr-qc | null | Positive energy singularities induced by Sine-Gordon solitons in 1+1
dimensional dilaton gravity with positive and negative cosmological constant
are considered. When the cosmological constant is positive, the singularities
combine a white hole, a timelike singularity and a black hole joined smoothly
near the soliton... | [
{
"created": "Sun, 24 Apr 1994 14:55:22 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Apr 1995 21:33:03 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Vaz",
"Cenalo",
""
],
[
"Witten",
"Louis",
""
]
] | Positive energy singularities induced by Sine-Gordon solitons in 1+1 dimensional dilaton gravity with positive and negative cosmological constant are considered. When the cosmological constant is positive, the singularities combine a white hole, a timelike singularity and a black hole joined smoothly near the soliton c... |
0908.4454 | Todd Oliynyk | Todd A. Oliynyk | A rigorous formulation of the cosmological Newtonian limit without
averaging | null | J.Hyperbol.Diff.Equat.7:405-431,2010 | 10.1142/S0219891610002189 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the existence of a large class of one-parameter families of
cosmological solutions to the Einstein-Euler equations that have a Newtonian
limit. This class includes solutions that represent a finite, but otherwise
arbitrary, number of compact fluid bodies. These solutions provide exact
cosmological models tha... | [
{
"created": "Mon, 31 Aug 2009 03:48:28 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Nov 2010 03:32:27 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Oliynyk",
"Todd A.",
""
]
] | We prove the existence of a large class of one-parameter families of cosmological solutions to the Einstein-Euler equations that have a Newtonian limit. This class includes solutions that represent a finite, but otherwise arbitrary, number of compact fluid bodies. These solutions provide exact cosmological models that ... |
1807.00171 | Damian Ejlli | Damian Ejlli and Venugopal R. Thandlam | GRAPH mixing | Published version in Physical Review D. In the published version the
title has been changed by the editors to 'Graviton-Photon mixing' instead of
'GRAPH mixing'. With respect to (v1), in this version (v2), typos have been
corrected, new references have been added and an additional section (sec.8)
has been added... | Phys. Rev. D 99, 044022 (2019) | 10.1103/PhysRevD.99.044022 | null | gr-qc astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the era of gravitational wave (GW) detection from astrophysical sources by
LIGO/VIRGO, it is of great importance to take the quantum gravity effect of
graviton-photon (GRAPH) mixing in the cosmic magnetic field to the next level.
In this work, we study such an effect and derive for the first time
perturbative solu... | [
{
"created": "Sat, 30 Jun 2018 12:50:48 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2019 14:08:13 GMT",
"version": "v2"
}
] | 2019-02-15 | [
[
"Ejlli",
"Damian",
""
],
[
"Thandlam",
"Venugopal R.",
""
]
] | In the era of gravitational wave (GW) detection from astrophysical sources by LIGO/VIRGO, it is of great importance to take the quantum gravity effect of graviton-photon (GRAPH) mixing in the cosmic magnetic field to the next level. In this work, we study such an effect and derive for the first time perturbative soluti... |
gr-qc/0406029 | Muhammad Sharif | M. Sharif and Sehar Aziz | On the Physical Properties of Spherically Symmetric Self-Similar
Solutions | LaTex, 14 pages, no figure | Int.J.Mod.Phys. D14 (2005) 73-84 | 10.1142/S0218271805005967 | null | gr-qc | null | In this paper, we are exploring some of the properties of the self-similar
solutions of the first kind. In particular, we shall discuss the kinematic
properties and also check the singularities of these solutions. We discuss
these properties both in co-moving and also in non co-moving (only in the
radial direction) c... | [
{
"created": "Tue, 8 Jun 2004 11:57:11 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sharif",
"M.",
""
],
[
"Aziz",
"Sehar",
""
]
] | In this paper, we are exploring some of the properties of the self-similar solutions of the first kind. In particular, we shall discuss the kinematic properties and also check the singularities of these solutions. We discuss these properties both in co-moving and also in non co-moving (only in the radial direction) coo... |
2110.15636 | Junlang Li | Junlang Li, Teng Zhang | Study of acceleration measurement in gravitational wave detection | 9 pages, 4 figures | null | 10.1088/1361-6382/ac4b98 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Position-meter and speed-meter interferometers have been analysed for
detecting gravitational waves. We introduce the concept of acceleration
measurement in comparison with position and speed measurement. In this paper,
we describe a general acceleration measurement and derive its standard quantum
limit. We provide a... | [
{
"created": "Fri, 29 Oct 2021 09:14:07 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Li",
"Junlang",
""
],
[
"Zhang",
"Teng",
""
]
] | Position-meter and speed-meter interferometers have been analysed for detecting gravitational waves. We introduce the concept of acceleration measurement in comparison with position and speed measurement. In this paper, we describe a general acceleration measurement and derive its standard quantum limit. We provide an ... |
gr-qc/0010014 | Hideyuki Tagoshi | Hideyuki Tagoshi, Akira Ohashi, Benjamin J. Owen | Gravitational field and equations of motion of spinning compact binaries
to 2.5 post-Newtonian order | 18 pages, no figure | Phys.Rev.D63:044006,2001 | 10.1103/PhysRevD.63.044006 | null | gr-qc | null | We derive spin-orbit coupling effects on the gravitational field and
equations of motion of compact binaries in the 2.5 post-Newtonian approximation
to general relativity, one PN order beyond where spin effects first appear. Our
method is based on that of Blanchet, Faye, and Ponsot, who use a post-Newtonian
metric va... | [
{
"created": "Wed, 4 Oct 2000 11:09:24 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Tagoshi",
"Hideyuki",
""
],
[
"Ohashi",
"Akira",
""
],
[
"Owen",
"Benjamin J.",
""
]
] | We derive spin-orbit coupling effects on the gravitational field and equations of motion of compact binaries in the 2.5 post-Newtonian approximation to general relativity, one PN order beyond where spin effects first appear. Our method is based on that of Blanchet, Faye, and Ponsot, who use a post-Newtonian metric vali... |
2108.12553 | Parampreet Singh | Bao-Fei Li, Parampreet Singh | Quantum gravity might restrict a cyclic evolution | 23 pages, 10 figures | null | 10.1103/PhysRevD.105.046013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is generally expected that in a non-singular cosmological model a cyclic
evolution is straightforward to obtain on introduction of a suitable choice of
a scalar field with a negative potential or a negative cosmological constant
which causes a recollapse at some time in the evolution. We present a counter
example ... | [
{
"created": "Sat, 28 Aug 2021 02:31:58 GMT",
"version": "v1"
}
] | 2022-03-14 | [
[
"Li",
"Bao-Fei",
""
],
[
"Singh",
"Parampreet",
""
]
] | It is generally expected that in a non-singular cosmological model a cyclic evolution is straightforward to obtain on introduction of a suitable choice of a scalar field with a negative potential or a negative cosmological constant which causes a recollapse at some time in the evolution. We present a counter example to... |
2405.08024 | Christian Corda Prof. | Elmo Benedetto, Christian Corda and Ignazio Licata | Equivalence Principle and Machian origin of extended gravity | Essay dedicated to the memory of the Authors' beloved mothers,
awarded Honorable Mention in the Gravity Research Foundation 2024 Awards for
Essays on Gravitation. arXiv admin note: text overlap with arXiv:1411.0829 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chae's analyses on GAIA observations of wide binary stars have fortified the
paradigm of extended gravity with particular attention to MOND-like theories.
We recall that, starting from the origin of Einstein's general relativity, the
request of Mach on the structure of the theory has been the core of the
foundational... | [
{
"created": "Sun, 12 May 2024 07:33:50 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Benedetto",
"Elmo",
""
],
[
"Corda",
"Christian",
""
],
[
"Licata",
"Ignazio",
""
]
] | Chae's analyses on GAIA observations of wide binary stars have fortified the paradigm of extended gravity with particular attention to MOND-like theories. We recall that, starting from the origin of Einstein's general relativity, the request of Mach on the structure of the theory has been the core of the foundational d... |
2010.03632 | S. I. Kruglov | S.I. Kruglov | Inflation of Universe by Nonlinear Electrodynamics | 20 pages, 6 figures, accepted in Int.J.Mod.Phys.D | Int,J.Mod.Phys.D, Vol.29, No.15, 2050102 (2020) | 10.1142/S0218271820501023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonlinear electrodynamics with two dimensional parameters is studied. The
range of electromagnetic fields when principles of causality, unitarity and the
classical stability hold, are obtained. A singularity of the electric field at
the center of charges is absent within our model and there are corrections to
the Cou... | [
{
"created": "Wed, 7 Oct 2020 20:13:28 GMT",
"version": "v1"
}
] | 2022-12-27 | [
[
"Kruglov",
"S. I.",
""
]
] | Nonlinear electrodynamics with two dimensional parameters is studied. The range of electromagnetic fields when principles of causality, unitarity and the classical stability hold, are obtained. A singularity of the electric field at the center of charges is absent within our model and there are corrections to the Coulo... |
2304.01833 | Giampiero Esposito Dr. | Zahra Mirzaiyan, Giampiero Esposito | On the nature of Bondi-Metzner-Sachs transformations | In the final version, the presentation has been improved | null | 10.3390/sym15040947 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates first the four branches of BMS transformations,
motivated by the classification into elliptic, parabolic, hyperbolic and
loxodromic proposed a few years ago in the literature. We first prove that to
each normal elliptic transformation of the complex variable zeta used in the
metric for cuts of... | [
{
"created": "Tue, 4 Apr 2023 14:36:21 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Apr 2023 12:37:11 GMT",
"version": "v2"
}
] | 2023-04-24 | [
[
"Mirzaiyan",
"Zahra",
""
],
[
"Esposito",
"Giampiero",
""
]
] | This paper investigates first the four branches of BMS transformations, motivated by the classification into elliptic, parabolic, hyperbolic and loxodromic proposed a few years ago in the literature. We first prove that to each normal elliptic transformation of the complex variable zeta used in the metric for cuts of n... |
1111.0147 | Dibakar Roychowdhury | Rabin Banerjee, Dibakar Roychowdhury | Critical phenomena in Born-Infeld AdS black holes | LaTex, 13 pages, 10 figures, text modified, numerical results
included, references added, to appear in Physical Review D | Phys. Rev. D 85, 044040 (2012) | 10.1103/PhysRevD.85.044040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the thermodynamics of critical phenomena in Born-Infeld AdS
black holes using a canonical ensemble. The critical behavior has been studied
near the critical point which is characterized by a discontinuity in the heat
capacity at constant charge. We explicitly calculate the critical exponents of
the rel... | [
{
"created": "Tue, 1 Nov 2011 08:57:58 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2012 05:54:55 GMT",
"version": "v2"
}
] | 2012-02-21 | [
[
"Banerjee",
"Rabin",
""
],
[
"Roychowdhury",
"Dibakar",
""
]
] | We investigate the thermodynamics of critical phenomena in Born-Infeld AdS black holes using a canonical ensemble. The critical behavior has been studied near the critical point which is characterized by a discontinuity in the heat capacity at constant charge. We explicitly calculate the critical exponents of the relev... |
gr-qc/9906051 | null | S. Capozziello, G. Lambiase, H.-J.Schmidt | Nonminimal Derivative Couplings and Inflation in Generalized Theories of
Gravity | 11 pages, Latex, to appear in Annals of Physics (Leipzig) | Annalen Phys.9:39-48,2000 | 10.1002/(SICI)1521-3889(200001)9:1<39::AID-ANDP39>3.0.CO;2-4 | null | gr-qc | null | We study extended theories of gravity where nonminimal derivative couplings
of the form $R^{kl}\phi_{, k}\phi_{, l}$ are present in the Lagrangian. We show
how and why the other couplings of similar structure may be ruled out and then
deduce the field equations and the related cosmological models. Finally, we get
inf... | [
{
"created": "Tue, 15 Jun 1999 13:46:03 GMT",
"version": "v1"
}
] | 2017-10-04 | [
[
"Capozziello",
"S.",
""
],
[
"Lambiase",
"G.",
""
],
[
"Schmidt",
"H. -J.",
""
]
] | We study extended theories of gravity where nonminimal derivative couplings of the form $R^{kl}\phi_{, k}\phi_{, l}$ are present in the Lagrangian. We show how and why the other couplings of similar structure may be ruled out and then deduce the field equations and the related cosmological models. Finally, we get infla... |
2401.05764 | Justin Feng | Justin C. Feng | Gravity limits the kinetic energy of a massive elementary particle | 2 pages. v2: Major changes. Calculations unchanged, major
improvements to discussion regarding interpretation, and a strong assumption
was relaxed. Conclusions changed accordingly | null | null | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, I argue that tidal effects generically limit the kinetic energy
of a single massive elementary particle in the vicinity of a compact object. As
the kinetic energy is increased, the differences in the tidal potential over a
Compton wavelength will at some point exceed the rest mass of the particle.
Above... | [
{
"created": "Thu, 11 Jan 2024 09:15:53 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2024 14:55:40 GMT",
"version": "v2"
}
] | 2024-01-24 | [
[
"Feng",
"Justin C.",
""
]
] | In this note, I argue that tidal effects generically limit the kinetic energy of a single massive elementary particle in the vicinity of a compact object. As the kinetic energy is increased, the differences in the tidal potential over a Compton wavelength will at some point exceed the rest mass of the particle. Above t... |
gr-qc/0403105 | Aleksandr Ageyev | Alexandr Ageev, Belkis Cabrera Palmer, Antonio De Felice, Steven D.
Penn, Peter R. Saulson | Very high quality factor measured in annealed fused silica | 8 pages, 2 figures | Class.Quant.Grav. 21 (2004) 3887-3892 | 10.1088/0264-9381/21/16/004 | null | gr-qc | null | We present the results of quality factor measurements for rod samples made of
fused silica. To decrease the dissipation we annealed our samples. The highest
quality factor that we observed was $Q=(2.03\pm0.01)\times10^8$ for a mode at
384 Hz. This is the highest published value of $Q$ in fused silica measured to
date... | [
{
"created": "Thu, 25 Mar 2004 16:00:57 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ageev",
"Alexandr",
""
],
[
"Palmer",
"Belkis Cabrera",
""
],
[
"De Felice",
"Antonio",
""
],
[
"Penn",
"Steven D.",
""
],
[
"Saulson",
"Peter R.",
""
]
] | We present the results of quality factor measurements for rod samples made of fused silica. To decrease the dissipation we annealed our samples. The highest quality factor that we observed was $Q=(2.03\pm0.01)\times10^8$ for a mode at 384 Hz. This is the highest published value of $Q$ in fused silica measured to date. |
2112.09772 | Jan Henryk Kwapisz | Astrid Eichhorn and Jan Henryk Kwapisz and Marc Schiffer | The weak-gravity bound in asymptotically safe gravity-gauge systems | 33 pages, 7 figures | null | 10.1103/PhysRevD.105.106022 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The weak-gravity bound has been discovered in asymptotically safe
gravity-matter systems, where it limits the maximum strength of gravitational
fluctuations. In the present paper, we explore it for the first time in systems
with more than one gauge field, to discover whether systems with 12 gauge
fields (like the Sta... | [
{
"created": "Fri, 17 Dec 2021 21:22:02 GMT",
"version": "v1"
}
] | 2022-06-08 | [
[
"Eichhorn",
"Astrid",
""
],
[
"Kwapisz",
"Jan Henryk",
""
],
[
"Schiffer",
"Marc",
""
]
] | The weak-gravity bound has been discovered in asymptotically safe gravity-matter systems, where it limits the maximum strength of gravitational fluctuations. In the present paper, we explore it for the first time in systems with more than one gauge field, to discover whether systems with 12 gauge fields (like the Stand... |
1410.4110 | Sven de Rijcke | Sven De Rijcke, Robbert Verbeke, Thomas Boelens | The dynamics of general relativistic isotropic stellar cluster models --
Do relativistic extensions of the Plummer model exist? | 10 pages, 5 figures, accepted for publication by MNRAS | null | 10.1093/mnras/stu1912 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the general relativistic theory of the dynamics of isotropic
stellar clusters can be developed essentially along the same lines as the
Newtonian theory. We prove that the distribution function can be derived from
any isotropic momentum moment and that every higher-order moment of the
distribution can be ... | [
{
"created": "Wed, 15 Oct 2014 16:04:32 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"De Rijcke",
"Sven",
""
],
[
"Verbeke",
"Robbert",
""
],
[
"Boelens",
"Thomas",
""
]
] | We show that the general relativistic theory of the dynamics of isotropic stellar clusters can be developed essentially along the same lines as the Newtonian theory. We prove that the distribution function can be derived from any isotropic momentum moment and that every higher-order moment of the distribution can be wr... |
1912.09407 | Lu\'is Filipe Costa | L. Filipe O. Costa, Jos\'e Nat\'ario, N. O. Santos | Gravitomagnetism in the Lewis cylindrical metrics | 43 pages, 6 Figures. Minor re-write/simplifications to the text, new
section 5.2.4 added discussing the spinning cosmic string limit, titles of
subsections 5.4 and 5.4.2 changed, references added, typos corrected. Matches
the final published version | Class. Quantum Grav. 38 (2021) 055003 | 10.1088/1361-6382/abc570 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lewis solutions describe the exterior gravitational field produced by
infinitely long rotating cylinders, and are useful models for global
gravitational effects. When the metric parameters are real (Weyl class), the
exterior metrics of rotating and static cylinders are locally
indistinguishable, but known to glob... | [
{
"created": "Thu, 19 Dec 2019 17:26:10 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2020 17:25:51 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Jan 2021 19:17:29 GMT",
"version": "v3"
}
] | 2021-01-15 | [
[
"Costa",
"L. Filipe O.",
""
],
[
"Natário",
"José",
""
],
[
"Santos",
"N. O.",
""
]
] | The Lewis solutions describe the exterior gravitational field produced by infinitely long rotating cylinders, and are useful models for global gravitational effects. When the metric parameters are real (Weyl class), the exterior metrics of rotating and static cylinders are locally indistinguishable, but known to global... |
gr-qc/0504055 | Jian-Yang Zhu | Guihua Tian, Shikun Wang, Zhao Zheng | Is the Schwarzschild black hole really stable? | null | null | null | null | gr-qc | null | The stability of the Schwarzschild black hole is studied. Regge and Wheeler
treated the problem first at 1957 and obtained the dynamical equations for the
small perturbation. There are two kinds of perturbations: odd one and even one.
Using the Painlev\'{e} coordinate, we reconsider the odd perturbation and find
that... | [
{
"created": "Wed, 13 Apr 2005 03:12:50 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Apr 2005 03:59:58 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Tian",
"Guihua",
""
],
[
"Wang",
"Shikun",
""
],
[
"Zheng",
"Zhao",
""
]
] | The stability of the Schwarzschild black hole is studied. Regge and Wheeler treated the problem first at 1957 and obtained the dynamical equations for the small perturbation. There are two kinds of perturbations: odd one and even one. Using the Painlev\'{e} coordinate, we reconsider the odd perturbation and find that: ... |
gr-qc/9811014 | Grigori Volovik | T.A. Jacobson and G.E. Volovik | Effective spacetime and Hawking radiation from moving domain wall in
thin film of 3He-A | revtex file, 4 pages, 2 figures, submitted to JETP Lett | Pisma Zh.Eksp.Teor.Fiz. 68 (1998) 833-838; JETP Lett. 68 (1998)
874-880 | 10.1134/1.567808 | null | gr-qc cond-mat hep-th | null | An event horizon for "relativistic" fermionic quasiparticles can be
constructed in a thin film of superfluid 3He-A. The quasiparticles see an
effective "gravitational" field which is induced by a topological soliton of
the order parameter. Within the soliton the "speed of light" crosses zero and
changes sign. When th... | [
{
"created": "Wed, 4 Nov 1998 09:03:05 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Jacobson",
"T. A.",
""
],
[
"Volovik",
"G. E.",
""
]
] | An event horizon for "relativistic" fermionic quasiparticles can be constructed in a thin film of superfluid 3He-A. The quasiparticles see an effective "gravitational" field which is induced by a topological soliton of the order parameter. Within the soliton the "speed of light" crosses zero and changes sign. When the ... |
gr-qc/0002084 | C. L. B. Correia da Silva | Cristovao Correia da Silva, Ruth M. Williams | Simplicial minisuperspace models in the presence of a massive scalar
field with arbitrary scalar coupling | 24 pages and 9 figures. Accepted for publication by Classical and
Quantum Gravity | Class.Quant.Grav. 17 (2000) 1827-1845 | 10.1088/0264-9381/17/8/306 | null | gr-qc | null | We extend previous simplicial minisuperspace models to account for arbitrary
scalar coupling \eta R\phi^2.
| [
{
"created": "Fri, 25 Feb 2000 00:29:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"da Silva",
"Cristovao Correia",
""
],
[
"Williams",
"Ruth M.",
""
]
] | We extend previous simplicial minisuperspace models to account for arbitrary scalar coupling \eta R\phi^2. |
gr-qc/9606073 | null | B. L. Hu | Hawking-Unruh Thermal Radiance as Relativistic Exponential Scaling of
Quantum Noise | Latex 13 pages; Invited talk at the Fourth International Workshop on
Thermal Field Theory and Applications, Dalian, China, August, 1995.
Proceedings edited by Y. X. Gui and F. C. Khanna (World Scientific,
Singapore, 1996) | null | null | umdpp 96-52, Jan. 26, 1996 | gr-qc | null | The Hawking-Unruh effect of thermal radiance from a black hole or observed by
an accelerated detector is usually viewed as a geometric effect related to the
existence of an event horizon. Here we propose a new viewpoint, that the
detection of thermal radiance in these systems is a local, kinematic effect
arising from... | [
{
"created": "Wed, 26 Jun 1996 19:57:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hu",
"B. L.",
""
]
] | The Hawking-Unruh effect of thermal radiance from a black hole or observed by an accelerated detector is usually viewed as a geometric effect related to the existence of an event horizon. Here we propose a new viewpoint, that the detection of thermal radiance in these systems is a local, kinematic effect arising from t... |
1106.0715 | Barun Majumder | Barun Majumder | Black Hole Entropy and the Modified Uncertainty Principle: A heuristic
analysis | 8 pages, accepted for publication in Physics Letters B | Phys. Lett. B 703 (2011) 402-405 | 10.1016/j.physletb.2011.08.026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently Ali et.al.(2009) proposed a Generalized Uncertainty Principle (or
GUP) with a linear term in momentum (accompanied by Plank length). Inspired by
this idea here we calculate the quantum corrected value of a Schwarzschild
black hole entropy and a Reissner-Nordstrom black hole with double horizon by
utilizing t... | [
{
"created": "Fri, 3 Jun 2011 17:40:59 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2011 06:56:38 GMT",
"version": "v2"
}
] | 2011-09-02 | [
[
"Majumder",
"Barun",
""
]
] | Recently Ali et.al.(2009) proposed a Generalized Uncertainty Principle (or GUP) with a linear term in momentum (accompanied by Plank length). Inspired by this idea here we calculate the quantum corrected value of a Schwarzschild black hole entropy and a Reissner-Nordstrom black hole with double horizon by utilizing the... |
1510.01061 | Gang Sun | Gang Sun, Yong-Chang Huang | The cosmology in f(R,T) gravity without dark energy | null | null | 10.1142/S0218271816500383 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the evolution of universe in $f(R,T)$ gravity where $R$ is the
Ricci curvature and $T$ is the trace of energy momentum tensor. We focus on the
specific form $f(R,T) = R+f(T)$ and explicitly find out the relation between
$f(T)$ and state of equation $w$ by adiabatic condition. All possible modes of
evolutio... | [
{
"created": "Mon, 5 Oct 2015 08:35:55 GMT",
"version": "v1"
}
] | 2016-03-16 | [
[
"Sun",
"Gang",
""
],
[
"Huang",
"Yong-Chang",
""
]
] | We examine the evolution of universe in $f(R,T)$ gravity where $R$ is the Ricci curvature and $T$ is the trace of energy momentum tensor. We focus on the specific form $f(R,T) = R+f(T)$ and explicitly find out the relation between $f(T)$ and state of equation $w$ by adiabatic condition. All possible modes of evolution ... |
1105.3807 | Reinhard Meinel | Reinhard Meinel and Moritz H\"utten | On the black hole limit of electrically counterpoised dust
configurations | 8 pages, 1 figure, to appear in CQG | Class.Quant.Grav.28:225010,2011 | 10.1088/0264-9381/28/22/225010 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By means of a simple scaling transformation any asymptotically flat
Papapetrou-Majumdar solution of the Einstein-Maxwell equations corresponding to
a localized regular distribution of electrically counterpoised dust can be
reformulated as a one-parameter family of solutions admitting a black hole
limit. In the limit,... | [
{
"created": "Thu, 19 May 2011 07:38:22 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2011 05:16:29 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Sep 2011 17:53:15 GMT",
"version": "v3"
}
] | 2011-10-19 | [
[
"Meinel",
"Reinhard",
""
],
[
"Hütten",
"Moritz",
""
]
] | By means of a simple scaling transformation any asymptotically flat Papapetrou-Majumdar solution of the Einstein-Maxwell equations corresponding to a localized regular distribution of electrically counterpoised dust can be reformulated as a one-parameter family of solutions admitting a black hole limit. In the limit, a... |
1907.09463 | Pedro Ca\~nate Casseres | Pedro Ca\~nate, Joseph Sultana, Demosthenes Kazanas | Ellis wormhole without a phantom scalar field | 12 pages, 3 figures. Minor changes, matches published version | Phys. Rev. D 100, 064007 (2019) | 10.1103/PhysRevD.100.064007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present an exact solution for $(3+1)$-dimensional
Einstein-scalar-Gauss-Bonnet theory (EsGB) in electrovacuum. The solution is
characterized by only one parameter, $Q$, which in general can be associated
with the electromagnetic field and the scalar field. We show that the solution
corresponds to a ... | [
{
"created": "Mon, 22 Jul 2019 17:56:30 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Sep 2019 17:24:00 GMT",
"version": "v2"
}
] | 2019-09-11 | [
[
"Cañate",
"Pedro",
""
],
[
"Sultana",
"Joseph",
""
],
[
"Kazanas",
"Demosthenes",
""
]
] | In this paper, we present an exact solution for $(3+1)$-dimensional Einstein-scalar-Gauss-Bonnet theory (EsGB) in electrovacuum. The solution is characterized by only one parameter, $Q$, which in general can be associated with the electromagnetic field and the scalar field. We show that the solution corresponds to a ch... |
0907.4367 | Yuri Obukhov | Yuri N. Obukhov, Alexander J. Silenko, Oleg V. Teryaev | Spin dynamics in gravitational fields of rotating bodies and the
equivalence principle | 22 pages, Revtex, no figures, accepted in Phys. Rev. D | Phys.Rev.D80:064044,2009 | 10.1103/PhysRevD.80.064044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the quantum and classical dynamics of a particle with spin in the
gravitational field of a rotating source. A relativistic equation describing
the motion of classical spin in curved spacetimes is obtained. We demonstrate
that the precession of the classical spin is in a perfect agreement with the
motion of... | [
{
"created": "Fri, 24 Jul 2009 19:45:27 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Sep 2009 21:25:55 GMT",
"version": "v2"
}
] | 2009-11-06 | [
[
"Obukhov",
"Yuri N.",
""
],
[
"Silenko",
"Alexander J.",
""
],
[
"Teryaev",
"Oleg V.",
""
]
] | We discuss the quantum and classical dynamics of a particle with spin in the gravitational field of a rotating source. A relativistic equation describing the motion of classical spin in curved spacetimes is obtained. We demonstrate that the precession of the classical spin is in a perfect agreement with the motion of t... |
1607.08034 | Soumya Chakrabarti | Soumya Chakrabarti and Narayan Banerjee | Gravitational collapse in f(R) gravity for a spherically symmetric
spacetime admitting a homothetic Killing vector | 11 pages, 10 figures | Eur. Phys. J. Plus (2016) 131: 144 | 10.1140/epjp/i2016-16144-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational collapse of a spherical distribution, in a class of f(R)
theories of gravity, where f(R) is power function of R, is discussed. The
spacetime is assumed to admit a homothetic Killing vector. In the collapsing
modes, some of the situations indeed hit a singularity, but they are all
covered with an app... | [
{
"created": "Wed, 27 Jul 2016 11:04:56 GMT",
"version": "v1"
}
] | 2016-07-28 | [
[
"Chakrabarti",
"Soumya",
""
],
[
"Banerjee",
"Narayan",
""
]
] | The gravitational collapse of a spherical distribution, in a class of f(R) theories of gravity, where f(R) is power function of R, is discussed. The spacetime is assumed to admit a homothetic Killing vector. In the collapsing modes, some of the situations indeed hit a singularity, but they are all covered with an appar... |
1706.07662 | Shahram Panahiyan | Seyed Hossein Hendi, Shahram Panahiyan, Behzad Eslam Panah, Mubasher
Jamil | Alternative approach to thermodynamic phase transitions | 9 pages, 2 figures; matches published version | Chinese Physics C Vol. 43, No. 11 (2019) 113106 | 10.1088/1674-1137/43/11/113106 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the major open problems in theoretical physics is a consistent quantum
gravity theory.Recent developments in thermodynamic phase transitions ofblack
holes and their van der Waals-like behavior may provide an interesting quantum
interpretation of classical gravity. Studyingdifferent methods of investigating
pha... | [
{
"created": "Wed, 21 Jun 2017 12:06:56 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Oct 2019 14:20:55 GMT",
"version": "v2"
}
] | 2020-06-26 | [
[
"Hendi",
"Seyed Hossein",
""
],
[
"Panahiyan",
"Shahram",
""
],
[
"Panah",
"Behzad Eslam",
""
],
[
"Jamil",
"Mubasher",
""
]
] | One of the major open problems in theoretical physics is a consistent quantum gravity theory.Recent developments in thermodynamic phase transitions ofblack holes and their van der Waals-like behavior may provide an interesting quantum interpretation of classical gravity. Studyingdifferent methods of investigating phase... |
gr-qc/9611057 | Martin Rainer | A. Zhuk | Multidimensional Quantum Cosmology: Quantum Wormholes, Third
Quantization, Inflation from "Nothing", etc | null | Grav.Cosmol 2:17-26,1996 | null | Mosc-6/1995 | gr-qc | null | A multidimensional cosmological model with space-time consisting of n (n>1)
Einstein spaces M_i is investigated in the presence of a cosmological constant
Lambda and m homogeneous minimally coupled scalar fields as a matter source.
Classes of the models integrable at classical as well as quantum levels are
found. The... | [
{
"created": "Sun, 24 Nov 1996 18:05:52 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Zhuk",
"A.",
""
]
] | A multidimensional cosmological model with space-time consisting of n (n>1) Einstein spaces M_i is investigated in the presence of a cosmological constant Lambda and m homogeneous minimally coupled scalar fields as a matter source. Classes of the models integrable at classical as well as quantum levels are found. These... |
2202.07044 | Alexander Zhuk | Alexander Zhuk and Valerii Shulga | Effect of medium on fundamental interactions in gravity and condensed
matter | 8 pages, v2 (matching the publication in Frontiers in Physics) = v1 +
minor changes | Frontiers in Physics, 10 (2022) 875757 | 10.3389/fphy.2022.875757 | null | gr-qc astro-ph.CO cond-mat.supr-con hep-th | http://creativecommons.org/licenses/by/4.0/ | Recently, it was shown that the gravitational field undergoes exponential
cutoff at large cosmological scales due to the presence of background matter.
In this article, we demonstrate that there is a close mathematical analogy
between this effect and the behavior of the magnetic field induced by a
solenoid placed in ... | [
{
"created": "Mon, 14 Feb 2022 21:21:04 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2022 13:43:15 GMT",
"version": "v2"
}
] | 2022-05-25 | [
[
"Zhuk",
"Alexander",
""
],
[
"Shulga",
"Valerii",
""
]
] | Recently, it was shown that the gravitational field undergoes exponential cutoff at large cosmological scales due to the presence of background matter. In this article, we demonstrate that there is a close mathematical analogy between this effect and the behavior of the magnetic field induced by a solenoid placed in a ... |
gr-qc/0005088 | Felix Finster | Felix Finster, Niky Kamran, Joel Smoller, and Shing-Tung Yau | The Long-Time Dynamics of Dirac Particles in the Kerr-Newman Black Hole
Geometry | 22 pages, small improvements | Adv.Theor.Math.Phys.7:25-52,2003 | 10.4310/ATMP.2003.v7.n1.a2 | null | gr-qc math-ph math.DG math.MP | null | We consider the Cauchy problem for the massive Dirac equation in the
non-extreme Kerr-Newman geometry outside the event horizon. We derive an
integral representation for the Dirac propagator involving the solutions of the
ODEs which arise in Chandrasekhar's separation of variables. It is proved that
for initial data ... | [
{
"created": "Fri, 19 May 2000 16:03:11 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jul 2001 15:36:44 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Feb 2003 10:53:57 GMT",
"version": "v3"
},
{
"created": "Wed, 24 Dec 2003 22:10:57 GMT",
"version": "v4"
}
] | 2014-01-28 | [
[
"Finster",
"Felix",
""
],
[
"Kamran",
"Niky",
""
],
[
"Smoller",
"Joel",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | We consider the Cauchy problem for the massive Dirac equation in the non-extreme Kerr-Newman geometry outside the event horizon. We derive an integral representation for the Dirac propagator involving the solutions of the ODEs which arise in Chandrasekhar's separation of variables. It is proved that for initial data in... |
2009.08293 | Betti Hartmann | Yves Brihaye and Betti Hartmann | Strong gravity effects of charged Q-clouds and inflating black holes | null | null | 10.1088/1361-6382/abd95a | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we re-examine charged Q-clouds around spherically symmetric,
static black holes. In particular, we demonstrate that for fixed coupling
constants two different branches of charged scalar clouds exist around
Schwarzschild black holes. This had not been noticed previously. We find that
the new solutions p... | [
{
"created": "Thu, 17 Sep 2020 13:41:21 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Brihaye",
"Yves",
""
],
[
"Hartmann",
"Betti",
""
]
] | In this paper, we re-examine charged Q-clouds around spherically symmetric, static black holes. In particular, we demonstrate that for fixed coupling constants two different branches of charged scalar clouds exist around Schwarzschild black holes. This had not been noticed previously. We find that the new solutions pos... |
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