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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0311067 | Diego Pavon | Winfried Zimdahl, Diego Pavon | Statefinder parameters for interacting dark energy | 11 pages, two encapsulated eps figures, key words: cosmology,
accelerated expansion, statefinder parameters | Gen.Rel.Grav. 36 (2004) 1483-1491 | 10.1023/B:GERG.0000022584.54115.9e | null | gr-qc astro-ph hep-ph hep-th | null | We argue that the recently introduced "statefinder parameters" (Sahni et al.,
JETP Lett. 77, 201 (2003)), that include the third derivative of the cosmic
scale factor, are useful tools to characterize interacting quitessence models.
We specify the statefinder parameters for two classes of models that solve, or
at lea... | [
{
"created": "Thu, 20 Nov 2003 16:08:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Zimdahl",
"Winfried",
""
],
[
"Pavon",
"Diego",
""
]
] | We argue that the recently introduced "statefinder parameters" (Sahni et al., JETP Lett. 77, 201 (2003)), that include the third derivative of the cosmic scale factor, are useful tools to characterize interacting quitessence models. We specify the statefinder parameters for two classes of models that solve, or at least... |
gr-qc/9412072 | Ed Seidel | Steven R. Brandt and Edward Seidel | The Evolution of Distorted Rotating Black Holes I: Methods and Tests | 22 pages, LaTeX with RevTeX 3.0 macros. 16 uuencoded gz-compressed
postscript figures. Also available at http://jean-luc.ncsa.uiuc.edu/Papers/
Submitted to Physical Review D | Phys.Rev. D52 (1995) 856-869 | 10.1103/PhysRevD.52.856 | null | gr-qc | null | We have developed a new numerical code to study the evolution of distorted,
rotating black holes. We discuss the numerical methods and gauge conditions we
developed to evolve such spacetimes. The code has been put through a series of
tests, and we report on (a) results of comparisons with codes designed to
evolve non... | [
{
"created": "Thu, 22 Dec 1994 17:48:45 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Brandt",
"Steven R.",
""
],
[
"Seidel",
"Edward",
""
]
] | We have developed a new numerical code to study the evolution of distorted, rotating black holes. We discuss the numerical methods and gauge conditions we developed to evolve such spacetimes. The code has been put through a series of tests, and we report on (a) results of comparisons with codes designed to evolve non-r... |
2203.10872 | Gihyuk Cho | Gihyuk Cho | Third post-Newtonian gravitational radiation from two-body scattering
II. Hereditary Energy radiation | null | null | 10.1103/PhysRevD.105.104035 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We compute the hereditary part of the third post-Newtonian accurate
gravitational energy radiation from hyperbolic scatterings (and parabolic
scatterings) of non-spinning compact objects. We employ large angular momentum
($j$) expansion, and compute it to the relative $1/j^{11}$ order (so the first
12 terms). For par... | [
{
"created": "Mon, 21 Mar 2022 10:51:40 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Oct 2022 01:25:30 GMT",
"version": "v2"
}
] | 2022-10-04 | [
[
"Cho",
"Gihyuk",
""
]
] | We compute the hereditary part of the third post-Newtonian accurate gravitational energy radiation from hyperbolic scatterings (and parabolic scatterings) of non-spinning compact objects. We employ large angular momentum ($j$) expansion, and compute it to the relative $1/j^{11}$ order (so the first 12 terms). For parab... |
1201.3504 | Jose Navarro | J. Navarro, J. B. Sancho | Energy and electromagnetism of a differential form | 28 pages. Referee's suggestions added. To appear in Journal of
Mathematical Physics | J. Math. Phys. 53, 102501 (2012) | 10.1063/1.4754817 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let X be a smooth manifold of dimension 1+n endowed with a lorentzian metric
g, and let T be the electromagnetic energy tensor associated to a 2-form F. In
this paper we characterize this tensor T as the only 2-covariant natural tensor
associated to a lorentzian metric and a 2-form that is independent of the unit
of ... | [
{
"created": "Tue, 17 Jan 2012 13:00:35 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2012 12:49:51 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Sep 2012 10:34:45 GMT",
"version": "v3"
}
] | 2012-10-23 | [
[
"Navarro",
"J.",
""
],
[
"Sancho",
"J. B.",
""
]
] | Let X be a smooth manifold of dimension 1+n endowed with a lorentzian metric g, and let T be the electromagnetic energy tensor associated to a 2-form F. In this paper we characterize this tensor T as the only 2-covariant natural tensor associated to a lorentzian metric and a 2-form that is independent of the unit of sc... |
2306.08081 | Muhammad Zubair | M. Zubair, Mushayydha Farooq | Bouncing behaviours in four dimensional Einstein Gauss-Bonnet gravity
with Cosmography and Observational constraints | 24 pages, 25 figures | Eur. Phys. J. Plus (2023) 138:173 | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This manuscript is based on an investigation of bouncing cosmology in a 4D
Einstein Gauss-Bonnet gravity. Various bouncing models such as symmetric
bounce, matter bounce, super bounce, and oscillatory bounce have been examined.
Expressions for energy density, pressure, equation of state parameter have been
derived in... | [
{
"created": "Wed, 31 May 2023 07:12:49 GMT",
"version": "v1"
}
] | 2023-06-16 | [
[
"Zubair",
"M.",
""
],
[
"Farooq",
"Mushayydha",
""
]
] | This manuscript is based on an investigation of bouncing cosmology in a 4D Einstein Gauss-Bonnet gravity. Various bouncing models such as symmetric bounce, matter bounce, super bounce, and oscillatory bounce have been examined. Expressions for energy density, pressure, equation of state parameter have been derived in t... |
1506.02497 | Prado Martin-Moruno | Prado Martin-Moruno, Nelson J. Nunes | Attracted to de Sitter II: cosmology of the shift-symmetric Horndeski
models | V1: 20 pages, 11 figures. V2: 1 reference added. V3: 21 pages.
Clarifications in the discussion; no physics changes. This version accepted
for publication in JCAP | JCAP 09 (2015) 056 | 10.1088/1475-7516/2015/09/056 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Horndeski models with a de Sitter critical point for any kind of material
content may provide a mechanism to alleviate the cosmological constant problem.
Moreover, they could allow us to understand the current accelerated expansion
of the universe as the result of the dynamical approach to the critical point
when it ... | [
{
"created": "Mon, 8 Jun 2015 13:42:31 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jun 2015 10:00:50 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Sep 2015 14:26:12 GMT",
"version": "v3"
}
] | 2015-09-30 | [
[
"Martin-Moruno",
"Prado",
""
],
[
"Nunes",
"Nelson J.",
""
]
] | Horndeski models with a de Sitter critical point for any kind of material content may provide a mechanism to alleviate the cosmological constant problem. Moreover, they could allow us to understand the current accelerated expansion of the universe as the result of the dynamical approach to the critical point when it is... |
gr-qc/9712043 | Andrew T. Sornborger | Peter D'Eath and Andrew Sornborger | Persistence Amplitudes from Numerical Quantum Gravity | 22 pages, 12 figures (bitmapped postscript), a postscript version of
this paper with high quality postscript figures may be found at
http://www-astro-theory.fnal.gov/Personal/ats/welcome.html | Class.Quant.Grav.15:3435-3447,1998 | 10.1088/0264-9381/15/11/010 | DAMTP Relativity Group Preprint: DAMTP-R97/56 and Fermilab Preprint:
Pub-97/364-A | gr-qc | null | The Euclidean quantum amplitude to go between data specified on an initial
and a final hypersurface may be approximated by the tree amplitude
exp(-I_{classical}/\hbar), where I_{classical} is the Euclidean action of the
classical solution joining the initial and final data. In certain cases the
tree amplitude is exac... | [
{
"created": "Tue, 9 Dec 1997 17:13:45 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"D'Eath",
"Peter",
""
],
[
"Sornborger",
"Andrew",
""
]
] | The Euclidean quantum amplitude to go between data specified on an initial and a final hypersurface may be approximated by the tree amplitude exp(-I_{classical}/\hbar), where I_{classical} is the Euclidean action of the classical solution joining the initial and final data. In certain cases the tree amplitude is exact.... |
gr-qc/9703015 | Markus Heusler | Markus Heusler | Mass formulae for a class of nonrotating black holes | 18 pages, revtex, no figures | null | 10.1103/PhysRevD.56.961 | ZU-TH 6/97 | gr-qc | null | In the presence of a Killing symmetry, various self-gravitating field
theories with massless scalars (moduli) and vector fields reduce to
sigma-models, effectively coupled to 3-dimensional gravity. We argue that this
particular structure of the Einstein-matter equations gives rise to quadratic
relations between the a... | [
{
"created": "Thu, 6 Mar 1997 13:55:54 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Heusler",
"Markus",
""
]
] | In the presence of a Killing symmetry, various self-gravitating field theories with massless scalars (moduli) and vector fields reduce to sigma-models, effectively coupled to 3-dimensional gravity. We argue that this particular structure of the Einstein-matter equations gives rise to quadratic relations between the asy... |
gr-qc/9801102 | Herman Julio Mosqueira Cuesta | H. J. Mosquera Cuesta(1), J. C. N. de Araujo(1), O. D. Aguiar(1), and
J. E. Horvath(2) ((1) Divisao Astrofisica - Instituto Nacional de Pesquisas
Espaciais - INPE (2) Instituto Astronomico e Geofisico - Universidade de Sao
Paulo) | Gravitational-wave bursts from soft gamma-ray repeaters: Can they be
detected? | 5 pages, [prl]{revtex}, 1 PS figure included. To appear in Physical
Review Letters | Phys.Rev.Lett.80:2988-2991,1998 | 10.1103/PhysRevLett.80.2988 | null | gr-qc astro-ph | null | In this letter we suggest a scenario for simultaneous emission of
gravitational-wave and $\gamma$-ray bursts (GRBs) from soft gamma-ray repeaters
(SGRs). we argue that both of the radiations can be generated by a
super-Eddington accreting neutron stars in X-ray binaries. In this model a
supercritical accretion transi... | [
{
"created": "Thu, 29 Jan 1998 15:59:54 GMT",
"version": "v1"
}
] | 2011-05-24 | [
[
"Cuesta",
"H. J. Mosquera",
""
],
[
"de Araujo",
"J. C. N.",
""
],
[
"Aguiar",
"O. D.",
""
],
[
"Horvath",
"J. E.",
""
]
] | In this letter we suggest a scenario for simultaneous emission of gravitational-wave and $\gamma$-ray bursts (GRBs) from soft gamma-ray repeaters (SGRs). we argue that both of the radiations can be generated by a super-Eddington accreting neutron stars in X-ray binaries. In this model a supercritical accretion transien... |
1811.09589 | Camilo Posada | Camilo Posada and Cecilia Chirenti | On the radial stability of ultra compact Schwarzschild stars beyond the
Buchdahl limit | 16 pages, 8 figures; minor revisions, two plots and references added,
accepted for publication in CQG | Class. Quantum Grav. 36, 065004 (2019) | 10.1088/1361-6382/ab0526 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we used the theory of adiabatic radial oscillations developed
by Chandrasekhar to study the conditions for dynamical stability of constant
energy-density stars, or Schwarzschild stars, in the unstudied ultra compact
regime beyond the Buchdahl limit, that is, for configurations with radius $R$
in the ran... | [
{
"created": "Fri, 23 Nov 2018 18:26:05 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2019 17:22:00 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Posada",
"Camilo",
""
],
[
"Chirenti",
"Cecilia",
""
]
] | In this paper we used the theory of adiabatic radial oscillations developed by Chandrasekhar to study the conditions for dynamical stability of constant energy-density stars, or Schwarzschild stars, in the unstudied ultra compact regime beyond the Buchdahl limit, that is, for configurations with radius $R$ in the range... |
0902.2356 | Christian Corda | Christian Corda | Interferometric detection of gravitational waves arising from extended
theories of gravity | To appear in Proceedings of the 3rd Stueckelberg Workshop, July 2008,
Pescara, Italy | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Even if Einstein's General Relativity achieved a great success and overcame
lots of experimental tests, it also showed some shortcomings and flaws which
today advise theorists to ask if it is the definitive theory of gravity. In
this letter Proceeding we show that, by assuming that advanced projects on the
detection ... | [
{
"created": "Fri, 13 Feb 2009 17:28:44 GMT",
"version": "v1"
}
] | 2009-02-16 | [
[
"Corda",
"Christian",
""
]
] | Even if Einstein's General Relativity achieved a great success and overcame lots of experimental tests, it also showed some shortcomings and flaws which today advise theorists to ask if it is the definitive theory of gravity. In this letter Proceeding we show that, by assuming that advanced projects on the detection of... |
1009.4109 | Jonathan Luk | Jonathan Luk | The Null Condition and Global Existence for Nonlinear Wave Equations on
Slowly Rotating Kerr Spacetimes | null | null | null | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a semilinear equation with derivatives satisfying a null condition
on slowly rotating Kerr spacetimes. We prove that given sufficiently small
initial data, the solution exists globally in time and decays with a
quantitative rate to the trivial solution. The proof uses the robust vector
field method. It makes... | [
{
"created": "Tue, 21 Sep 2010 14:22:35 GMT",
"version": "v1"
}
] | 2010-09-22 | [
[
"Luk",
"Jonathan",
""
]
] | We study a semilinear equation with derivatives satisfying a null condition on slowly rotating Kerr spacetimes. We prove that given sufficiently small initial data, the solution exists globally in time and decays with a quantitative rate to the trivial solution. The proof uses the robust vector field method. It makes u... |
2406.03909 | Saeed Rastgoo | Federica Fragomeno, Douglas M. Gingrich, Samantha Hergott, Saeed
Rastgoo, Evan Vienneau | A generalized uncertainty-inspired quantum black hole | 35 pages, 7 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the full spacetime metric of a generalized uncertainty-inspired
quantum black hole. We examine a previous model of the interior in this
approach and show that extending its metric to the full spacetime leads to
serious issues in the asymptotic region. To remedy this, we introduce an
"improved scheme" mimick... | [
{
"created": "Thu, 6 Jun 2024 09:44:00 GMT",
"version": "v1"
}
] | 2024-06-07 | [
[
"Fragomeno",
"Federica",
""
],
[
"Gingrich",
"Douglas M.",
""
],
[
"Hergott",
"Samantha",
""
],
[
"Rastgoo",
"Saeed",
""
],
[
"Vienneau",
"Evan",
""
]
] | We derive the full spacetime metric of a generalized uncertainty-inspired quantum black hole. We examine a previous model of the interior in this approach and show that extending its metric to the full spacetime leads to serious issues in the asymptotic region. To remedy this, we introduce an "improved scheme" mimickin... |
gr-qc/9704008 | Robert Manuel Wald | Robert M. Wald | The ``Nernst Theorem'' and Black Hole Thermodynamics | 20 pages, plain LaTeX file | Phys. Rev. D 56, 6467 (1997) | 10.1103/PhysRevD.56.6467 | null | gr-qc cond-mat.stat-mech hep-th | null | The Nernst formulation of the third law of ordinary thermodynamics (often
referred to as the ``Nernst theorem'') asserts that the entropy, $S$, of a
system must go to zero (or a ``universal constant'') as its temperature, $T$,
goes to zero. This assertion is commonly considered to be a fundamental law of
thermodynami... | [
{
"created": "Thu, 3 Apr 1997 19:40:21 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Wald",
"Robert M.",
""
]
] | The Nernst formulation of the third law of ordinary thermodynamics (often referred to as the ``Nernst theorem'') asserts that the entropy, $S$, of a system must go to zero (or a ``universal constant'') as its temperature, $T$, goes to zero. This assertion is commonly considered to be a fundamental law of thermodynamics... |
gr-qc/9811023 | Garcia | L.C.Garcia de Andrade | Space-time defects :Domain walls and torsion | J.Math.Phys.39,(1998),Jan. issue | J.Math.Phys. 39 (1998) 372-379 | 10.1063/1.532318 | null | gr-qc | null | The theory of distributions in non-Riemannian spaces is used to obtain exact
static thin domain wall solutions of Einstein-Cartan equations of gravity.
Curvature $ \delta $-singularities are found while Cartan torsion is given by
Heaviside functions. Weitzenb\"{o}ck planar walls are caracterized by torsion
$\delta$-s... | [
{
"created": "Fri, 6 Nov 1998 20:51:40 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | The theory of distributions in non-Riemannian spaces is used to obtain exact static thin domain wall solutions of Einstein-Cartan equations of gravity. Curvature $ \delta $-singularities are found while Cartan torsion is given by Heaviside functions. Weitzenb\"{o}ck planar walls are caracterized by torsion $\delta$-sin... |
1112.3567 | Benjamin Bahr | Benjamin Bahr | Operator Spin Foams: holonomy formulation and coarse graining | 5 pages, 3 figures, to appear in Journal of Physics: Conference
Series. (JPCS) | null | 10.1088/1742-6596/360/1/012042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A dual holonomy version of operator spin foam models is presented, which is
particularly adapted to the notion of coarse graining. We discuss how this
leads to a natural way of comparing models on different discretization scales,
and a notion of renormalization group flow on the partially ordered set of
2-complexes.
| [
{
"created": "Thu, 15 Dec 2011 16:52:42 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Bahr",
"Benjamin",
""
]
] | A dual holonomy version of operator spin foam models is presented, which is particularly adapted to the notion of coarse graining. We discuss how this leads to a natural way of comparing models on different discretization scales, and a notion of renormalization group flow on the partially ordered set of 2-complexes. |
1505.06691 | Fatimah Shojai | F. Shojai and A. Shojai | The equivalence principle and the relative velocity of local inertial
frames | 1 Figure | Am. J. Phys., Vol. 83, No. 6, June 2015 | 10.1119/1.4913901 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we explicitly show that in general relativity, the relative
velocity of two local inertial frames is always less than the velocity of
light. This fact is a by-product of the equivalence principle. The general
result is then illustrated within two examples, the FLRW cosmological model and
the Schwarzschi... | [
{
"created": "Mon, 25 May 2015 16:57:55 GMT",
"version": "v1"
}
] | 2015-05-26 | [
[
"Shojai",
"F.",
""
],
[
"Shojai",
"A.",
""
]
] | In this paper we explicitly show that in general relativity, the relative velocity of two local inertial frames is always less than the velocity of light. This fact is a by-product of the equivalence principle. The general result is then illustrated within two examples, the FLRW cosmological model and the Schwarzschild... |
gr-qc/9301013 | null | M.Campanelli and C.O.Lousto | "Are Black Holes in Brans-Dicke Theory precisely the same as in General
Relativity?" | 13pages, Plain Tex | Int.J.Mod.Phys.D2:451-462,1993 | 10.1142/S0218271893000325 | null | gr-qc astro-ph hep-th | null | We study a three-parameters family of solutions of the Brans-Dicke field
equations. They are static and spherically symmetric. We find the range of
parameters for which this solution represents a black hole different from the
Schwarzschild one. We find a subfamily of solutions which agrees with
experiments and observ... | [
{
"created": "Thu, 14 Jan 1993 13:08:56 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jan 1993 16:06:55 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Jan 1993 17:34:34 GMT",
"version": "v3"
}
] | 2010-11-01 | [
[
"Campanelli",
"M.",
""
],
[
"Lousto",
"C. O.",
""
]
] | We study a three-parameters family of solutions of the Brans-Dicke field equations. They are static and spherically symmetric. We find the range of parameters for which this solution represents a black hole different from the Schwarzschild one. We find a subfamily of solutions which agrees with experiments and observat... |
1510.05593 | Abhay Ashtekar | Abhay Ashtekar, B\'eatrice Bonga, Aruna Kesavan | Asymptotics with a positive cosmological constant: III. The quadrupole
formula | 31 pages, 2 figures | Phys. Rev. D92, 10432 (21 pages) (2015) | 10.1103/PhysRevD.92.104032 | IGC-1509/2 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Almost a century ago, Einstein used a weak field approximation around
Minkowski space-time to calculate the energy carried away by gravitational
waves emitted by a time changing mass-quadrupole. However, by now there is
strong observational evidence for a positive cosmological constant, $\Lambda$.
To incorporate this... | [
{
"created": "Mon, 19 Oct 2015 17:26:31 GMT",
"version": "v1"
}
] | 2015-11-17 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Bonga",
"Béatrice",
""
],
[
"Kesavan",
"Aruna",
""
]
] | Almost a century ago, Einstein used a weak field approximation around Minkowski space-time to calculate the energy carried away by gravitational waves emitted by a time changing mass-quadrupole. However, by now there is strong observational evidence for a positive cosmological constant, $\Lambda$. To incorporate this f... |
1807.10085 | Donato Bini | Donato Bini, Andrea Geralico, Robert T. Jantzen | Black hole geodesic parallel transport and the Marck recipe for
isolating cumulative precession effects | 18 pages, RevTex macros | Phys. Rev. D 99, 064041 (2019) | 10.1103/PhysRevD.99.064041 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Wigner rotations arising from the combination of boosts along two
different directions are rederived from a relative boost point of view and
applied to gyroscope spin precession along timelike geodesics in a Kerr
spacetime, clarifying the geometrical properties of Marck's recipe for
describing parallel transport ... | [
{
"created": "Thu, 26 Jul 2018 12:09:58 GMT",
"version": "v1"
}
] | 2019-04-03 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Jantzen",
"Robert T.",
""
]
] | The Wigner rotations arising from the combination of boosts along two different directions are rederived from a relative boost point of view and applied to gyroscope spin precession along timelike geodesics in a Kerr spacetime, clarifying the geometrical properties of Marck's recipe for describing parallel transport al... |
1609.01253 | Anna Ijjas | Anna Ijjas and Paul J. Steinhardt | Fully stable cosmological solutions with a non-singular classical bounce | 6 pages, 4 figures. Version 5 contains minor corrections to
coefficients in the first paragraph of Sec. 5 and to the labeling in Fig 2 | Phys. Lett. B 764 (2017) pp. 289-294 | 10.1016/j.physletb.2016.11.047 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We recently showed how it is possible to use a cubic Galileon action to
construct classical cosmological solutions that enter a contracting null energy
condition (NEC) violating phase, bounce at finite values of the scale factor
and exit into an expanding NEC-satisfying phase without encountering any
singularities or... | [
{
"created": "Mon, 5 Sep 2016 18:54:09 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2016 04:42:28 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Nov 2016 00:51:54 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Dec 2016 16:31:32 GMT",
"version": "v4"
},
{
"cre... | 2020-11-19 | [
[
"Ijjas",
"Anna",
""
],
[
"Steinhardt",
"Paul J.",
""
]
] | We recently showed how it is possible to use a cubic Galileon action to construct classical cosmological solutions that enter a contracting null energy condition (NEC) violating phase, bounce at finite values of the scale factor and exit into an expanding NEC-satisfying phase without encountering any singularities or p... |
0904.0422 | Jose Socorro Garcia | J. Socorro, M. Sabido, and L. Arturo Ure\~na-L\'opez | Classical and quantum Cosmology of the S\'aez-Ballester theory | 9 pages, latex | Fizika B19:177-186,2010 | null | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | We study the generalization of the S\'aez-Ballester theory applied to a flat
FRW cosmological model. Classical exact solutions up to quadratures are easily
obtained using the Hamilton-Jacobi approach. Contrary to claims in the
specialized literature, it is shown that the S\'aez-Ballester theory cannot
provide a reali... | [
{
"created": "Thu, 2 Apr 2009 16:27:29 GMT",
"version": "v1"
}
] | 2011-08-09 | [
[
"Socorro",
"J.",
""
],
[
"Sabido",
"M.",
""
],
[
"Ureña-López",
"L. Arturo",
""
]
] | We study the generalization of the S\'aez-Ballester theory applied to a flat FRW cosmological model. Classical exact solutions up to quadratures are easily obtained using the Hamilton-Jacobi approach. Contrary to claims in the specialized literature, it is shown that the S\'aez-Ballester theory cannot provide a realist... |
2006.05392 | T. P. Singh | Meghraj M S, Abhishek Pandey and Tejinder P. Singh | Why does the Kerr-Newman black hole have the same gyromagnetic ratio as
the electron? | 30 pages | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have recently proposed a deterministic matrix dynamics at the Planck
scale, for gravity coupled to Dirac fermions, evolving in the so-called Connes
time. By coarse-graining this dynamics over time intervals much larger than
Planck time, we derived the space-time manifold, quantum theory, and classical
general rela... | [
{
"created": "Tue, 9 Jun 2020 16:42:35 GMT",
"version": "v1"
}
] | 2020-06-11 | [
[
"S",
"Meghraj M",
""
],
[
"Pandey",
"Abhishek",
""
],
[
"Singh",
"Tejinder P.",
""
]
] | We have recently proposed a deterministic matrix dynamics at the Planck scale, for gravity coupled to Dirac fermions, evolving in the so-called Connes time. By coarse-graining this dynamics over time intervals much larger than Planck time, we derived the space-time manifold, quantum theory, and classical general relati... |
2210.05322 | Cosimo Bambi | Cosimo Bambi | Testing Gravity with Black Hole X-Ray Data | 35 pages, 13 figures. Chapter for the book "Recent Progress on
Gravity Tests" (Eds. C. Bambi and A. C\'ardenas-Avenda\~no, Springer
Singapore, expected in 2023). It reviews current X-ray constraints on the
Kerr hypothesis and discusses the systematic uncertainties | null | 10.1007/978-981-97-2871-8_5 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analysis of the properties of the X-ray radiation emitted from
geometrically thin accretion disks around black holes can be a powerful tool to
test General Relativity in the strong field regime. This chapter reviews the
state-of-the-art of gravity tests with black hole X-ray data. So far, most
efforts have been d... | [
{
"created": "Tue, 11 Oct 2022 10:25:41 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Bambi",
"Cosimo",
""
]
] | The analysis of the properties of the X-ray radiation emitted from geometrically thin accretion disks around black holes can be a powerful tool to test General Relativity in the strong field regime. This chapter reviews the state-of-the-art of gravity tests with black hole X-ray data. So far, most efforts have been dev... |
1104.4464 | Lorenzo Iorio | L. Iorio | On Some Critical Issues of the LAGEOS-Based Tests of the Lense-Thirring
Effect | Latex2e, 14 pages, no figures, no tables, 67 references. I thank M.
Cerdonio for private communication (September 2010) | J.Mod.Phys.2:210-218,2011 | 10.4236/jmp.2011.24029 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize some critical issues pertaining the tests of the general
relativistic Lense-Thirring effect performed by I. Ciufolini and coworkers in
the gravitational field of the Earth with the geodetic satellites LAGEOS and
LAGEOS II tracked with the Satellite Laser Ranging technique.
| [
{
"created": "Fri, 22 Apr 2011 15:15:43 GMT",
"version": "v1"
}
] | 2011-05-24 | [
[
"Iorio",
"L.",
""
]
] | We summarize some critical issues pertaining the tests of the general relativistic Lense-Thirring effect performed by I. Ciufolini and coworkers in the gravitational field of the Earth with the geodetic satellites LAGEOS and LAGEOS II tracked with the Satellite Laser Ranging technique. |
2003.08424 | Eduardo Bittencourt | Eduardo Bittencourt, Gabriel G. Carvalho, Iarley P. Lobo, Leandro
Santana | On the hypotheses of Penrose's singularity theorem under disformal
transformations | 10 pages, 3 figures | null | 10.1140/epjc/s10052-020-7830-0 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze how the hypotheses of Penrose's singularity theorem (1965) are
modified by the action of disformal transformations (defined in terms of
light-like vectors) upon a given space-time metric. In particular, we
investigate the transformation of the null energy condition and the existence
of closed trapped surfa... | [
{
"created": "Wed, 18 Mar 2020 18:32:33 GMT",
"version": "v1"
}
] | 2020-03-20 | [
[
"Bittencourt",
"Eduardo",
""
],
[
"Carvalho",
"Gabriel G.",
""
],
[
"Lobo",
"Iarley P.",
""
],
[
"Santana",
"Leandro",
""
]
] | We analyze how the hypotheses of Penrose's singularity theorem (1965) are modified by the action of disformal transformations (defined in terms of light-like vectors) upon a given space-time metric. In particular, we investigate the transformation of the null energy condition and the existence of closed trapped surface... |
2112.00918 | James Quach Dr | Salman Sajad Wani, James Q. Quach, Mir Faizal, Sebastian Bahamonde,
Behnam Pourhassan | A Quantum Informational Approach to the Problem of Time | 10 pages, 1 figure | Found Phys 52, 25 (2022) | 10.1007/s10701-022-00540-6 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Several novel approaches have been proposed to resolve the problem of time by
relating it to change. We argue using quantum information theory that the
Hamiltonian constraint in quantum gravity cannot probe change, so it cannot be
used to obtain a meaningful notion of time. This is due to the absence of
quantum Fishe... | [
{
"created": "Thu, 2 Dec 2021 01:30:53 GMT",
"version": "v1"
}
] | 2022-02-07 | [
[
"Wani",
"Salman Sajad",
""
],
[
"Quach",
"James Q.",
""
],
[
"Faizal",
"Mir",
""
],
[
"Bahamonde",
"Sebastian",
""
],
[
"Pourhassan",
"Behnam",
""
]
] | Several novel approaches have been proposed to resolve the problem of time by relating it to change. We argue using quantum information theory that the Hamiltonian constraint in quantum gravity cannot probe change, so it cannot be used to obtain a meaningful notion of time. This is due to the absence of quantum Fisher ... |
2212.06814 | Muhammad Sharif | M. Sharif and Tayyab Naseer | Isotropization and Complexity Analysis of Decoupled Solutions in
$f(\mathbb{R},\mathbb{T})$ Theory | 29 pages, 11 figures | Eur. Phys. J. Plus 137(2022)1304 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper formulates some new exact solutions to the field equations by
means of minimal gravitational decoupling in the context of
$f(\mathbb{R},\mathbb{T})$ gravity. For this purpose, we consider anisotropic
spherical matter distribution and add an extra source to extend the existing
solutions. We apply the transf... | [
{
"created": "Fri, 9 Dec 2022 02:23:05 GMT",
"version": "v1"
}
] | 2022-12-14 | [
[
"Sharif",
"M.",
""
],
[
"Naseer",
"Tayyab",
""
]
] | This paper formulates some new exact solutions to the field equations by means of minimal gravitational decoupling in the context of $f(\mathbb{R},\mathbb{T})$ gravity. For this purpose, we consider anisotropic spherical matter distribution and add an extra source to extend the existing solutions. We apply the transfor... |
2010.08602 | Arnab Dhani | Arnab Dhani | Importance of mirror modes in binary black hole ringdown waveform | null | Phys. Rev. D 103, 104048 (2021) | 10.1103/PhysRevD.103.104048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The post-merger signal in binary black hole merger is described by linear,
black-hole perturbation theory. Historically, this has been modeled using the
dominant positive-frequency (corotating) fundamental mode. Recently, there has
been a renewed effort in modeling the post-merger waveform using higher,
positive-freq... | [
{
"created": "Fri, 16 Oct 2020 19:44:32 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2020 16:47:18 GMT",
"version": "v2"
}
] | 2021-05-26 | [
[
"Dhani",
"Arnab",
""
]
] | The post-merger signal in binary black hole merger is described by linear, black-hole perturbation theory. Historically, this has been modeled using the dominant positive-frequency (corotating) fundamental mode. Recently, there has been a renewed effort in modeling the post-merger waveform using higher, positive-freque... |
1811.05117 | Fabio Briscese | Fabio Briscese, Leonardo Modesto | Nonlinear stability of Minkowski spacetime in Nonlocal Gravity | null | JCAP07(2019)009 | 10.1088/1475-7516/2019/07/009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the Minkowski spacetime is stable at nonlinear level and to all
perturbative orders in the gravitational perturbation in a general class of
nonlocal gravitational theories that are unitary and finite at quantum level.
| [
{
"created": "Tue, 13 Nov 2018 05:46:37 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2019 16:36:19 GMT",
"version": "v2"
}
] | 2019-07-05 | [
[
"Briscese",
"Fabio",
""
],
[
"Modesto",
"Leonardo",
""
]
] | We prove that the Minkowski spacetime is stable at nonlinear level and to all perturbative orders in the gravitational perturbation in a general class of nonlocal gravitational theories that are unitary and finite at quantum level. |
gr-qc/0505135 | Gonzalo Olmo | Gonzalo J. Olmo | Post-Newtonian constraints on f(R) cosmologies in metric formalism | 10 pages, no figures, revtex4 | Phys.Rev.D 72, 083505 (2005) [combined with gr-qc/0505136] | 10.1103/PhysRevD.72.083505 | null | gr-qc astro-ph hep-th | null | We compute the complete post-Newtonian limit of the metric form of f(R)
gravities using a scalar-tensor representation. By comparing the predictions of
these theories with laboratory and solar system experiments, we find a set of
inequalities that any lagrangian f(R) must satisfy. The constraints imposed by
those ine... | [
{
"created": "Thu, 26 May 2005 22:52:50 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Olmo",
"Gonzalo J.",
""
]
] | We compute the complete post-Newtonian limit of the metric form of f(R) gravities using a scalar-tensor representation. By comparing the predictions of these theories with laboratory and solar system experiments, we find a set of inequalities that any lagrangian f(R) must satisfy. The constraints imposed by those inequ... |
1903.11364 | Sandeep Aashish | Sandeep Aashish, Sukanta Panda | Quantum aspects of antisymmetric tensor field with spontaneous Lorentz
violation | 20 pages; minor corrections, text improvements, references added;
published version | Phys. Rev. D 100, 065010 (2019) | 10.1103/PhysRevD.100.065010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantization of a simple model of antisymmetric tensor field
with spontaneous Lorentz violation in curved spacetime. We evaluate the 1-loop
corrections at first order of metric perturbation, using a general covariant
effective action approach. We revisit the issue of quantum equivalence, and
find that it... | [
{
"created": "Wed, 27 Mar 2019 11:46:45 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Sep 2019 15:09:50 GMT",
"version": "v2"
}
] | 2019-09-19 | [
[
"Aashish",
"Sandeep",
""
],
[
"Panda",
"Sukanta",
""
]
] | We study the quantization of a simple model of antisymmetric tensor field with spontaneous Lorentz violation in curved spacetime. We evaluate the 1-loop corrections at first order of metric perturbation, using a general covariant effective action approach. We revisit the issue of quantum equivalence, and find that it h... |
1406.7029 | Casey Handmer | Casey J. Handmer and B\'ela Szil\'agyi | Spectral Characteristic Evolution: A New Algorithm for Gravitational
Wave Propagation | 28 pages, 9 figures | null | 10.1088/0264-9381/32/2/025008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a spectral algorithm for solving the full nonlinear vacuum
Einstein field equations in the Bondi framework. Developed within the Spectral
Einstein Code (SpEC), we demonstrate spectral characteristic evolution as a
technical precursor to Cauchy Characteristic Extraction (CCE), a rigorous
method for obtainin... | [
{
"created": "Thu, 26 Jun 2014 21:04:17 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Sep 2014 22:10:11 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Handmer",
"Casey J.",
""
],
[
"Szilágyi",
"Béla",
""
]
] | We present a spectral algorithm for solving the full nonlinear vacuum Einstein field equations in the Bondi framework. Developed within the Spectral Einstein Code (SpEC), we demonstrate spectral characteristic evolution as a technical precursor to Cauchy Characteristic Extraction (CCE), a rigorous method for obtaining ... |
gr-qc/0505040 | Istvan Ozsvath | Juergen Ehlers, Istvan Ozsvath, Engelbert Schucking | Active Mass Under Pressure | 28 pages, 4 figures | Am.J.Phys. 74 (2006) 607-613 | 10.1119/1.2198881 | null | gr-qc | null | After a historical introduction to Poisson's equation for Newtonian gravity,
its analog for static gravitational fields in Einstein's theory is reviewed. It
appears that the pressure contribution to the active mass density in Einstein's
theory might also be noticeable at the Newtonian level. A form of its
surprising ... | [
{
"created": "Tue, 10 May 2005 00:35:58 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ehlers",
"Juergen",
""
],
[
"Ozsvath",
"Istvan",
""
],
[
"Schucking",
"Engelbert",
""
]
] | After a historical introduction to Poisson's equation for Newtonian gravity, its analog for static gravitational fields in Einstein's theory is reviewed. It appears that the pressure contribution to the active mass density in Einstein's theory might also be noticeable at the Newtonian level. A form of its surprising ap... |
2310.14190 | Taimur Mohammadi | Behrooz Malekolkalami and Taimur Mohammadi | Magnetic Dipole and Noncommutativity | 17 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The noncommutativity concept has wide range of applications in physical and
mathematical theories. Noncommutativity in the position-time coordinates
concerns the microscale structure of space-time. the noncommutativity is an
intrinsic property of the space-time and it could be different from usual
properties when one... | [
{
"created": "Sun, 22 Oct 2023 05:35:47 GMT",
"version": "v1"
}
] | 2023-10-24 | [
[
"Malekolkalami",
"Behrooz",
""
],
[
"Mohammadi",
"Taimur",
""
]
] | The noncommutativity concept has wide range of applications in physical and mathematical theories. Noncommutativity in the position-time coordinates concerns the microscale structure of space-time. the noncommutativity is an intrinsic property of the space-time and it could be different from usual properties when one e... |
1502.05219 | Gamal G.L. Nashed | G.G.L. Nashed | A special exact spherically symmetric solution in f(T) gravity theories | 14 pages | Gen Relativ Gravit (2013) 45: 1887 | 10.1007/s10714-013-1566-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A non-diagonal spherically symmetric tetrad field, involving four unknown
functions of radial coordinate $r$, is applied to the equations of motion of
f(T) gravity theory. A special exact vacuum solution with one constant of
integration is obtained. The scalar torsion related to this special solution
vanishes. To und... | [
{
"created": "Tue, 17 Feb 2015 10:26:13 GMT",
"version": "v1"
}
] | 2015-02-19 | [
[
"Nashed",
"G. G. L.",
""
]
] | A non-diagonal spherically symmetric tetrad field, involving four unknown functions of radial coordinate $r$, is applied to the equations of motion of f(T) gravity theory. A special exact vacuum solution with one constant of integration is obtained. The scalar torsion related to this special solution vanishes. To under... |
1107.0948 | Diego S\'aez-G\'omez | Salvatore Capozziello and Diego S\'aez-G\'omez | Scalar-tensor representation of $f(R)$ gravity and Birkhoff's theorem | 8 pages. Version to be published in Annalen der Physik | null | 10.1002/andp.201100244 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Birkhoff's theorem is discussed in the frame of f(R) gravity by using its
scalar-tensor representation. Modified gravity has become very popular at
recent times as it is able to reproduce the unification of inflation and
late-time acceleration with no need of a dark energy component or an inflaton
field. Here, anothe... | [
{
"created": "Tue, 5 Jul 2011 19:03:37 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2011 15:01:38 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Dec 2011 19:24:47 GMT",
"version": "v3"
}
] | 2015-05-28 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Sáez-Gómez",
"Diego",
""
]
] | Birkhoff's theorem is discussed in the frame of f(R) gravity by using its scalar-tensor representation. Modified gravity has become very popular at recent times as it is able to reproduce the unification of inflation and late-time acceleration with no need of a dark energy component or an inflaton field. Here, another ... |
gr-qc/9607054 | Nils Andersson | Nils Andersson and Hisashi Onozawa | Quasinormal modes of nearly extreme Reissner-Nordstrom black holes | 3 postscript figures | Phys.Rev. D54 (1996) 7470-7475 | 10.1103/PhysRevD.54.7470 | null | gr-qc | null | We present detailed calculations of the quasinormal modes of
Reissner-Nordstrom black holes. While the first few, slowly damped, modes
depend on the charge of the black hole in a relatively simple way, we find that
the rapidly damped modes show several peculiar features. The higher modes
generally spiral into the val... | [
{
"created": "Tue, 23 Jul 1996 15:59:20 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Andersson",
"Nils",
""
],
[
"Onozawa",
"Hisashi",
""
]
] | We present detailed calculations of the quasinormal modes of Reissner-Nordstrom black holes. While the first few, slowly damped, modes depend on the charge of the black hole in a relatively simple way, we find that the rapidly damped modes show several peculiar features. The higher modes generally spiral into the value... |
1401.8117 | Titus K Mathew | Praseetha P. and Titus K. Mathew | Entropy of the holographic dark energy and generalized second law | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have considered the holographic dark energy and studied it's
cosmology and thermodynamics. We have analysed the generalized second law (GSL)
of thermodynamics in a flat universe consists of interacting dark energy and
dark matter. We did the analysis both under thermal equilibrium and
non-equilibrium... | [
{
"created": "Fri, 31 Jan 2014 10:29:45 GMT",
"version": "v1"
}
] | 2014-02-03 | [
[
"P.",
"Praseetha",
""
],
[
"Mathew",
"Titus K.",
""
]
] | In this paper we have considered the holographic dark energy and studied it's cosmology and thermodynamics. We have analysed the generalized second law (GSL) of thermodynamics in a flat universe consists of interacting dark energy and dark matter. We did the analysis both under thermal equilibrium and non-equilibrium c... |
2202.06349 | Tiberiu Harko | Tiberiu Harko, Shahab Shahidi | Coupling matter and curvature in Weyl geometry: conformally invariant
$f\left(R,L_m\right)$ gravity | 22 pages, 2 figures, accepted for publication in EPJC | null | 10.1140/epjc/s10052-022-10126-1 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the coupling of matter to geometry in conformal quadratic Weyl
gravity, by assuming a coupling term of the form $L_m\tilde{R}^2$, where $L_m$
is the ordinary matter Lagrangian, and $\tilde{R}$ is the Weyl scalar. The
coupling explicitly satisfies the conformal invariance of the theory. By
expressing $\... | [
{
"created": "Sun, 13 Feb 2022 15:48:10 GMT",
"version": "v1"
}
] | 2022-03-30 | [
[
"Harko",
"Tiberiu",
""
],
[
"Shahidi",
"Shahab",
""
]
] | We investigate the coupling of matter to geometry in conformal quadratic Weyl gravity, by assuming a coupling term of the form $L_m\tilde{R}^2$, where $L_m$ is the ordinary matter Lagrangian, and $\tilde{R}$ is the Weyl scalar. The coupling explicitly satisfies the conformal invariance of the theory. By expressing $\ti... |
2212.06762 | Marcus Khuri | Marcus A. Khuri, Jordan F. Rainone | Black Lenses in Kaluza-Klein Matter | 6 pages; Phys. Rev. Lett., to appear; A Quanta Magazine article based
on the results of this paper may be found here:
https://www.quantamagazine.org/mathematicians-find-an-infinity-of-possible-black-hole-shapes-20230124/ | Phys. Rev. Lett., 131 (2023), 041402 | 10.1103/PhysRevLett.131.041402 | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first examples of formally asymptotically flat black hole
solutions with horizons of general lens space topology $L(p,q)$. These
5-dimensional static/stationary spacetimes are regular on and outside the event
horizon for any choice of relatively prime integers $1\leq q<p$, in particular
conical singula... | [
{
"created": "Tue, 13 Dec 2022 17:45:05 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2023 01:41:45 GMT",
"version": "v2"
}
] | 2023-08-09 | [
[
"Khuri",
"Marcus A.",
""
],
[
"Rainone",
"Jordan F.",
""
]
] | We present the first examples of formally asymptotically flat black hole solutions with horizons of general lens space topology $L(p,q)$. These 5-dimensional static/stationary spacetimes are regular on and outside the event horizon for any choice of relatively prime integers $1\leq q<p$, in particular conical singulari... |
1309.2768 | Bob Osano | Bob Osano | The Weyl Curvature Tensor, Cotton-York Tensor and Gravitational Waves: A
covariant consideration | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | 1+3 covariant approach to cosmological perturbation theory often employs the
electric part ($E_{ab}$), the magnetic part ($H_{ab}$) of the Weyl tensor or
the shear tensor ($\sigma_{ab}$) in a phenomenological description of
gravitational waves. The Cotton-York tensor is rarely mentioned in connection
with gravitation... | [
{
"created": "Wed, 11 Sep 2013 09:26:23 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Oct 2013 12:07:43 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Oct 2017 16:02:26 GMT",
"version": "v3"
}
] | 2017-10-31 | [
[
"Osano",
"Bob",
""
]
] | 1+3 covariant approach to cosmological perturbation theory often employs the electric part ($E_{ab}$), the magnetic part ($H_{ab}$) of the Weyl tensor or the shear tensor ($\sigma_{ab}$) in a phenomenological description of gravitational waves. The Cotton-York tensor is rarely mentioned in connection with gravitational... |
1003.3623 | Jerry B. Griffiths | J. B. Griffiths and N. O. Santos | A rotating cylinder in an asymptotically locally anti-de Sitter
background | To appear in Classical and Quantum Gravity | null | 10.1088/0264-9381/27/12/125004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A family of exact solutions is presented which represents a rigidly rotating
cylinder of dust in a background with a negative cosmological constant. The
interior of the infinite cylinder is described by the Godel solution. An exact
solution for the exterior solution is found which depends both on the rotation
of the ... | [
{
"created": "Thu, 18 Mar 2010 16:32:47 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Griffiths",
"J. B.",
""
],
[
"Santos",
"N. O.",
""
]
] | A family of exact solutions is presented which represents a rigidly rotating cylinder of dust in a background with a negative cosmological constant. The interior of the infinite cylinder is described by the Godel solution. An exact solution for the exterior solution is found which depends both on the rotation of the in... |
2402.07272 | Tsvetan Vetsov Assoc. Prof. Dr. | V. Avramov, H. Dimov, M. Radomirov, R. C. Rashkov, T. Vetsov | On Thermodynamic Stability of Black Holes. Part II: AdS Family of
Solutions | Minor update: 1) Minor changes in the text, 2) Mising references were
added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study is aimed at providing a thorough analysis of the classical
thermodynamic stability of black holes within the Anti-de Sitter (AdS) family.
We utilize the Nambu bracket formalism to calculate local heat capacities and
employ Sylvester's criterion in the mass-energy ensemble to determine both
local and global... | [
{
"created": "Sun, 11 Feb 2024 18:30:33 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2024 16:29:20 GMT",
"version": "v2"
}
] | 2024-04-10 | [
[
"Avramov",
"V.",
""
],
[
"Dimov",
"H.",
""
],
[
"Radomirov",
"M.",
""
],
[
"Rashkov",
"R. C.",
""
],
[
"Vetsov",
"T.",
""
]
] | This study is aimed at providing a thorough analysis of the classical thermodynamic stability of black holes within the Anti-de Sitter (AdS) family. We utilize the Nambu bracket formalism to calculate local heat capacities and employ Sylvester's criterion in the mass-energy ensemble to determine both local and global t... |
2405.09714 | Seturumane Tema | Saurya Das, S. Shajidul Haque and Seturumane Tema | Cosmological Singularity and Power-Law Solutions in Modified Gravity | null | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | A bouncing Universe avoids the big-bang singularity. Using the time-like and
null Raychaudhhuri equations, we explore whether the bounce near the big-bang,
within a broad spectrum of modified theories of gravity, allows for
cosmologically relevant power-law solutions under reasonable physical
conditions. Our study sh... | [
{
"created": "Wed, 15 May 2024 21:58:56 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Das",
"Saurya",
""
],
[
"Haque",
"S. Shajidul",
""
],
[
"Tema",
"Seturumane",
""
]
] | A bouncing Universe avoids the big-bang singularity. Using the time-like and null Raychaudhhuri equations, we explore whether the bounce near the big-bang, within a broad spectrum of modified theories of gravity, allows for cosmologically relevant power-law solutions under reasonable physical conditions. Our study show... |
1903.11638 | Raissa Mendes | Raissa F. P. Mendes and Tulio Ottoni | Scalar charges and pulsar-timing observables in the presence of
nonminimally coupled scalar fields | 12 pages, 6 figures | Phys. Rev. D 99, 124003 (2019) | 10.1103/PhysRevD.99.124003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pulsar-timing has become a celebrated tool for probing modifications to
General Relativity in the strong-field surroundings of neutron stars. Here we
investigate whether scalar-tensor theories that incorporate a nonminimally
coupled scalar degree of freedom may pass pulsar-timing tests, by computing the
scalar charge... | [
{
"created": "Wed, 27 Mar 2019 18:28:12 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2019 13:11:38 GMT",
"version": "v2"
}
] | 2019-06-19 | [
[
"Mendes",
"Raissa F. P.",
""
],
[
"Ottoni",
"Tulio",
""
]
] | Pulsar-timing has become a celebrated tool for probing modifications to General Relativity in the strong-field surroundings of neutron stars. Here we investigate whether scalar-tensor theories that incorporate a nonminimally coupled scalar degree of freedom may pass pulsar-timing tests, by computing the scalar charges ... |
1504.02702 | Peter Phillips | Peter R. Phillips | Broken symmetry can yield a positive effective G in conformal gravity | 4 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We modify the action of Mannheim's conformally invariant model by changing
the sign of two coefficients. This breaks conformal symmetry, but results in a
cosmology that has a positive effective G and at the same time retains one of
the main advantages of the Mannheim model, a possible solution of the
cosmological con... | [
{
"created": "Fri, 10 Apr 2015 15:04:57 GMT",
"version": "v1"
}
] | 2015-04-13 | [
[
"Phillips",
"Peter R.",
""
]
] | We modify the action of Mannheim's conformally invariant model by changing the sign of two coefficients. This breaks conformal symmetry, but results in a cosmology that has a positive effective G and at the same time retains one of the main advantages of the Mannheim model, a possible solution of the cosmological const... |
0903.4381 | Philip D. Mannheim | Philip D. Mannheim, James G. O'Brien and David Eric Cox | Limitations of the Standard Gravitational Perfect Fluid Paradigm | Final version to appear in General Relativity and Gravitation (the
final publication is available at http://www.springerlink.com). 29 pages, 1
figure | null | 10.1007/s10714-010-0997-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the standard perfect fluid paradigm is not necessarily a valid
description of a curved space steady state gravitational source. Simply by
virtue of not being flat, curved space geometries have to possess intrinsic
length scales, and such length scales can affect the fluid structure. For modes
of waveleng... | [
{
"created": "Wed, 25 Mar 2009 16:08:51 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 2010 16:29:46 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Mannheim",
"Philip D.",
""
],
[
"O'Brien",
"James G.",
""
],
[
"Cox",
"David Eric",
""
]
] | We show that the standard perfect fluid paradigm is not necessarily a valid description of a curved space steady state gravitational source. Simply by virtue of not being flat, curved space geometries have to possess intrinsic length scales, and such length scales can affect the fluid structure. For modes of wavelength... |
2210.06558 | Khadijeh Jafarzade | S. Mahmoudi, Kh. Jafarzade, S. H. Hendi | Gauss-Bonnet black holes in a special anisotropic scaling spacetime | 17 pages, 11 figures | JHEP 12 (2022) 009 | 10.1007/JHEP12(2022)009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the Lifshitz gravity as a theory with anisotropic scaling
behavior, we suggest a new $(n+1)-$dimensional metric in which the time and
spatial coordinates scale anisotropically as $(t,r,\theta_{i})\,\to
(\lambda^{z}t,\lambda^{-1}r,\lambda^{x_i}\,\theta_{i})$. Due to the anisotropic
scaling dimension of the... | [
{
"created": "Wed, 12 Oct 2022 19:56:48 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Dec 2022 07:09:32 GMT",
"version": "v2"
}
] | 2022-12-06 | [
[
"Mahmoudi",
"S.",
""
],
[
"Jafarzade",
"Kh.",
""
],
[
"Hendi",
"S. H.",
""
]
] | Inspired by the Lifshitz gravity as a theory with anisotropic scaling behavior, we suggest a new $(n+1)-$dimensional metric in which the time and spatial coordinates scale anisotropically as $(t,r,\theta_{i})\,\to (\lambda^{z}t,\lambda^{-1}r,\lambda^{x_i}\,\theta_{i})$. Due to the anisotropic scaling dimension of the s... |
1101.0030 | Shankaranarayanan S | S. Shankaranarayanan (IISER-Trivandrum) | Corrections to Bekenstein-Hawking entropy --- Quantum or not-so quantum? | 10 pages; Article for the Special Issue "Entropy in Quantum Gravity"
in the Journal Entropy | Entropy 13(1), 11-16 (2011); | 10.3390/e13010011 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation and Bekenstein--Hawking entropy are the two robust
predictions of a yet unknown quantum theory of gravity. Any theory which fails
to reproduce these predictions is certainly incorrect. While several approaches
lead to Bekenstein--Hawking entropy, they all lead to different sub-leading
corrections. I... | [
{
"created": "Thu, 30 Dec 2010 02:05:33 GMT",
"version": "v1"
}
] | 2011-01-04 | [
[
"Shankaranarayanan",
"S.",
"",
"IISER-Trivandrum"
]
] | Hawking radiation and Bekenstein--Hawking entropy are the two robust predictions of a yet unknown quantum theory of gravity. Any theory which fails to reproduce these predictions is certainly incorrect. While several approaches lead to Bekenstein--Hawking entropy, they all lead to different sub-leading corrections. In ... |
1401.5985 | Matej \v{S}kovran | Matej \v{S}kovran | Analytical solutions for cosmological perturbations in a one-component
universe with shear stress | 10 pages | Int. J. Mod. Phys. D 24 (2015) 1550063 | 10.1142/S0218271815500637 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct explicit solutions for scalar, vector and tensor perturbations
in a less known setting, a flat universe filled by an isotropic elastic solid
with pressure and shear modulus proportional to energy density. The solutions
generalize the well known formulas for cosmological perturbations in a universe
filled... | [
{
"created": "Thu, 23 Jan 2014 14:28:19 GMT",
"version": "v1"
},
{
"created": "Thu, 21 May 2015 09:33:17 GMT",
"version": "v2"
}
] | 2015-05-22 | [
[
"Škovran",
"Matej",
""
]
] | We construct explicit solutions for scalar, vector and tensor perturbations in a less known setting, a flat universe filled by an isotropic elastic solid with pressure and shear modulus proportional to energy density. The solutions generalize the well known formulas for cosmological perturbations in a universe filled b... |
2111.00706 | Zhi-Wei Wang | Zhi-Wei Wang, Samuel L. Braunstein, Saurya Das | Information recovery from evaporating rotating charged black holes | 8 pages, 5 figures, Proceeding of the Sixteenth Marcel Grossmann
Meeting (will be published in IJMPD). arXiv admin note: text overlap with
arXiv:2105.00198 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In classical gravity, nothing can escape from a black hole, not even light.
In particular, this happens for stationary black holes because their horizons
are null. We show, on the other hand, that the apparent horizon and the region
near r = 0 of an evaporating charged, rotating black hole are both timelike.
This imp... | [
{
"created": "Mon, 1 Nov 2021 04:57:15 GMT",
"version": "v1"
}
] | 2021-11-02 | [
[
"Wang",
"Zhi-Wei",
""
],
[
"Braunstein",
"Samuel L.",
""
],
[
"Das",
"Saurya",
""
]
] | In classical gravity, nothing can escape from a black hole, not even light. In particular, this happens for stationary black holes because their horizons are null. We show, on the other hand, that the apparent horizon and the region near r = 0 of an evaporating charged, rotating black hole are both timelike. This impli... |
2303.11885 | Hyat Huang | Hyat Huang, Jutta Kunz, Jinbo Yang and Cong Zhang | Light Ring behind Wormhole Throat: Geodesics, Images and Shadows | 26 pages, 14 figures, add references | null | 10.1103/PhysRevD.107.104060 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geodesics of the Ellis-Bronnikov wormhole with two parameters are
studied. The asymmetric wormhole has only one light ring and one innermost
stable circular orbit located on one side of the wormhole throat. Consequently,
certain light rays can be reflected back by the wormhole. Additionally, the
same wormhole can... | [
{
"created": "Tue, 21 Mar 2023 14:26:19 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2023 10:54:52 GMT",
"version": "v2"
}
] | 2023-06-14 | [
[
"Huang",
"Hyat",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Yang",
"Jinbo",
""
],
[
"Zhang",
"Cong",
""
]
] | The geodesics of the Ellis-Bronnikov wormhole with two parameters are studied. The asymmetric wormhole has only one light ring and one innermost stable circular orbit located on one side of the wormhole throat. Consequently, certain light rays can be reflected back by the wormhole. Additionally, the same wormhole can h... |
2109.13949 | Oscar J. C. Dias | Oscar J.C. Dias, Mahdi Godazgar, Jorge E. Santos, and Gregorio
Carullo, Walter Del Pozzo, Danny Laghi | Eigenvalue repulsions in the quasinormal spectra of the Kerr-Newman
black hole | 9 pages, 2 figures | null | 10.1103/PhysRevD.105.084044 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study the gravito-electromagnetic perturbations of the Kerr-Newman (KN)
black hole metric and identify the two $-$ photon sphere and near-horizon $-$
families of quasinormal modes (QNMs) of the KN black hole, computing the
frequency spectra (for all the KN parameter space) of the modes with the
slowest decay rate.... | [
{
"created": "Tue, 28 Sep 2021 18:00:06 GMT",
"version": "v1"
}
] | 2022-05-04 | [
[
"Dias",
"Oscar J. C.",
""
],
[
"Godazgar",
"Mahdi",
""
],
[
"Santos",
"Jorge E.",
""
],
[
"Carullo",
"Gregorio",
""
],
[
"Del Pozzo",
"Walter",
""
],
[
"Laghi",
"Danny",
""
]
] | We study the gravito-electromagnetic perturbations of the Kerr-Newman (KN) black hole metric and identify the two $-$ photon sphere and near-horizon $-$ families of quasinormal modes (QNMs) of the KN black hole, computing the frequency spectra (for all the KN parameter space) of the modes with the slowest decay rate. W... |
2106.09721 | Emanuele Berti | Enrico Barausse, Emanuele Berti, Vitor Cardoso, Scott A. Hughes,
Gaurav Khanna | Divergences in gravitational-wave emission and absorption from extreme
mass ratio binaries | 11 pages, 6 figures, matches version published in Physical Review D | Phys. Rev. D 104, 064031 (2021) | 10.1103/PhysRevD.104.064031 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A powerful technique to calculate gravitational radiation from binary systems
involves a perturbative expansion: if the masses of the two bodies are very
different, the "small" body is treated as a point particle of mass $m_p$ moving
in the gravitational field generated by the large mass $M$, and one keeps only
linea... | [
{
"created": "Thu, 17 Jun 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2021 14:59:27 GMT",
"version": "v2"
}
] | 2021-09-22 | [
[
"Barausse",
"Enrico",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Hughes",
"Scott A.",
""
],
[
"Khanna",
"Gaurav",
""
]
] | A powerful technique to calculate gravitational radiation from binary systems involves a perturbative expansion: if the masses of the two bodies are very different, the "small" body is treated as a point particle of mass $m_p$ moving in the gravitational field generated by the large mass $M$, and one keeps only linear ... |
0802.1885 | Marc Casals | Marc Casals | Electromagnetic Quantum Field Theory on Kerr-Newman Black Holes | Ph.D. thesis. University College Dublin, 2004. Advisor: Adrian C.
Ottewill | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study classical and quantum aspects of electromagnetic perturbations on
black hole space-times. We develop an elegant formalism introduced by Wald,
which sets up the theory of linear perturbations in a Type-D background in a
compact and transparent manner. We derive expressions for the electromagnetic
potential in... | [
{
"created": "Wed, 13 Feb 2008 18:14:37 GMT",
"version": "v1"
}
] | 2008-02-14 | [
[
"Casals",
"Marc",
""
]
] | We study classical and quantum aspects of electromagnetic perturbations on black hole space-times. We develop an elegant formalism introduced by Wald, which sets up the theory of linear perturbations in a Type-D background in a compact and transparent manner. We derive expressions for the electromagnetic potential in t... |
1611.03418 | Adam Lewis | Adam G.M. Lewis, Aaron Zimmerman, Harald P. Pfeiffer | Fundamental frequencies and resonances from eccentric and precessing
binary black hole inspirals | 40 pages, 15 figures Revised in response to reviewer comments. Figure
12, which previously had been incorrectly computed, is now correct | null | 10.1088/1361-6382/aa66f4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary black holes which are both eccentric and undergo precession remain
unexplored in numerical simulations. We present simulations of such systems
which cover about 50 orbits at comparatively high mass ratios 5 and 7. The
configurations correspond to the generic motion of a nonspinning body in a Kerr
spacetime, an... | [
{
"created": "Thu, 10 Nov 2016 17:41:55 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Feb 2017 16:12:48 GMT",
"version": "v2"
}
] | 2017-05-31 | [
[
"Lewis",
"Adam G. M.",
""
],
[
"Zimmerman",
"Aaron",
""
],
[
"Pfeiffer",
"Harald P.",
""
]
] | Binary black holes which are both eccentric and undergo precession remain unexplored in numerical simulations. We present simulations of such systems which cover about 50 orbits at comparatively high mass ratios 5 and 7. The configurations correspond to the generic motion of a nonspinning body in a Kerr spacetime, and ... |
1607.05986 | Sumanta Chakraborty | Sumanta Chakraborty | Boundary terms of the Einstein-Hilbert action | 26 pages, no figures; Dedicated to Prof. Padmanabhan on the occasion
of his sixtieth birthday; Published in the book "Gravity and the Quantum",
Eds. Jasjeet Singh Bagla and Sunu Engineer (Springer, 2017) | Fundam.Theor.Phys. 187 (2017) 43-59 | 10.1007/978-3-319-51700-1_5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein-Hilbert action for general relativity is not well posed in terms
of the metric $g_{ab}$ as a dynamical variable. There have been many proposals
to obtain an well posed action principle for general relativity, e.g., addition
of the Gibbons-Hawking-York boundary term to the Einstein-Hilbert action. These
b... | [
{
"created": "Tue, 19 Jul 2016 03:36:45 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Mar 2017 07:17:33 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Mar 2017 04:17:21 GMT",
"version": "v3"
}
] | 2017-03-16 | [
[
"Chakraborty",
"Sumanta",
""
]
] | The Einstein-Hilbert action for general relativity is not well posed in terms of the metric $g_{ab}$ as a dynamical variable. There have been many proposals to obtain an well posed action principle for general relativity, e.g., addition of the Gibbons-Hawking-York boundary term to the Einstein-Hilbert action. These bou... |
0906.0093 | Theocharis Apostolatos | Theocharis A. Apostolatos, Georgios Lukes-Gerakopoulos, George
Contopoulos | How to observe a non-Kerr spacetime | 4 pages, 2 figures | Phys.Rev.Lett.103:111101,2009 | 10.1103/PhysRevLett.103.111101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a generic criterion which can be used in gravitational-wave data
analysis to distinguish an extreme-mass-ratio inspiral into a Kerr background
spacetime from one into a non-Kerr background spacetime. The criterion exploits
the fact that when an integrable system, such as the system that describes
geodesic ... | [
{
"created": "Sat, 30 May 2009 16:59:41 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Apostolatos",
"Theocharis A.",
""
],
[
"Lukes-Gerakopoulos",
"Georgios",
""
],
[
"Contopoulos",
"George",
""
]
] | We present a generic criterion which can be used in gravitational-wave data analysis to distinguish an extreme-mass-ratio inspiral into a Kerr background spacetime from one into a non-Kerr background spacetime. The criterion exploits the fact that when an integrable system, such as the system that describes geodesic or... |
0712.1413 | Rakesh Tibrewala | Rakesh Tibrewala, Sashideep Gutti, T.P. Singh, Cenalo Vaz | Classical and Quantum Gravitational Collapse in d-dim AdS Spacetime I.
Classical Solutions | 19 pages, sections on surface gravity removed, section on self
similar solution expanded, appendix removed, references added. To appear in
Phys. Rev.D | Phys.Rev.D77:064012,2008 | 10.1103/PhysRevD.77.064012 | null | gr-qc astro-ph hep-th | null | We study the collapse of a spherically symmetric dust distribution in
$d$-dimensional AdS spacetime. We investigate the role of dimensionality, and
the presence of a negative cosmological constant, in determining the formation
of trapped surfaces and the end state of gravitational collapse. We obtain the
self-similar... | [
{
"created": "Mon, 10 Dec 2007 09:25:15 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2008 09:53:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Tibrewala",
"Rakesh",
""
],
[
"Gutti",
"Sashideep",
""
],
[
"Singh",
"T. P.",
""
],
[
"Vaz",
"Cenalo",
""
]
] | We study the collapse of a spherically symmetric dust distribution in $d$-dimensional AdS spacetime. We investigate the role of dimensionality, and the presence of a negative cosmological constant, in determining the formation of trapped surfaces and the end state of gravitational collapse. We obtain the self-similar s... |
1812.11603 | Borja Reina | Brien C. Nolan, Borja Reina, Kepa Sousa | First order perturbations of hypersurfaces of arbitrary causal character | 31 pages + appendices, 2 figures | null | 10.1088/1361-6382/ab300b | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the problem of first order perturbations of a general
hypersurface, i.e. with arbitrary causal character at each point. We extend the
framework by Mars (Class. Quantum Grav. 22 3325 (2005)) where this problem was
studied to second order for everywhere timelike or spacelike hypersurfaces, and
we ... | [
{
"created": "Sun, 30 Dec 2018 20:19:41 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Nolan",
"Brien C.",
""
],
[
"Reina",
"Borja",
""
],
[
"Sousa",
"Kepa",
""
]
] | In this work we study the problem of first order perturbations of a general hypersurface, i.e. with arbitrary causal character at each point. We extend the framework by Mars (Class. Quantum Grav. 22 3325 (2005)) where this problem was studied to second order for everywhere timelike or spacelike hypersurfaces, and we ad... |
2407.21076 | Saulo Carneiro | I. P. R. Baranov, H. A. Borges, F. C. Sobrinho and S. Carneiro | Non-singular naked solutions in quantum spacetime | 10 pages, 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Polymer models have been used to describe non-singular quantum black holes,
where the classical singularity is replaced by a transition from a black hole
to a white hole. In a previous letter, in the context of a uni-parametric model
with asymptotic flat exterior metric, we fixed the radius of the transition
surface ... | [
{
"created": "Mon, 29 Jul 2024 19:09:30 GMT",
"version": "v1"
}
] | 2024-08-01 | [
[
"Baranov",
"I. P. R.",
""
],
[
"Borges",
"H. A.",
""
],
[
"Sobrinho",
"F. C.",
""
],
[
"Carneiro",
"S.",
""
]
] | Polymer models have been used to describe non-singular quantum black holes, where the classical singularity is replaced by a transition from a black hole to a white hole. In a previous letter, in the context of a uni-parametric model with asymptotic flat exterior metric, we fixed the radius of the transition surface th... |
2009.06311 | Klaus Liegener Dr | Wojciech Kami\'nski, Klaus Liegener | Symmetry restriction and its application to gravity | 69 pages | Class. Quantum Grav. 38, 065013 (2021) | 10.1088/1361-6382/abdf29 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Hamiltonian formulation, it is not a priori clear whether a symmetric
configuration will keep its symmetry during evolution. In this paper, we give
precise requirements of when this is the case and propose a symmetry
restriction to the phase space of the symmetric variables. This can often ease
computation, es... | [
{
"created": "Mon, 14 Sep 2020 10:24:19 GMT",
"version": "v1"
}
] | 2021-11-01 | [
[
"Kamiński",
"Wojciech",
""
],
[
"Liegener",
"Klaus",
""
]
] | In the Hamiltonian formulation, it is not a priori clear whether a symmetric configuration will keep its symmetry during evolution. In this paper, we give precise requirements of when this is the case and propose a symmetry restriction to the phase space of the symmetric variables. This can often ease computation, espe... |
1705.00889 | Stefano Lucat | Stefano Lucat and Tomislav Prokopec | Observing Geometrical Torsion | 9 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamical (propagating) torsion can be observed by using conventional
gravitational wave detectors such as LIGO, Virgo, LISA and bar detectors. We
discuss specific signatures of different types of torsion, in particular those
of vector and mixed symmetric torsion (skew symmetric torsion cannot be
detected in this way... | [
{
"created": "Tue, 2 May 2017 10:26:00 GMT",
"version": "v1"
}
] | 2017-05-03 | [
[
"Lucat",
"Stefano",
""
],
[
"Prokopec",
"Tomislav",
""
]
] | Dynamical (propagating) torsion can be observed by using conventional gravitational wave detectors such as LIGO, Virgo, LISA and bar detectors. We discuss specific signatures of different types of torsion, in particular those of vector and mixed symmetric torsion (skew symmetric torsion cannot be detected in this way).... |
1406.1705 | Andrew Makarenko | Andrey N. Makarenko | Unification of the inflation with late-time acceleration in
Born-Infeld-$f(R)$ gravity | null | Astrophys.Space Sci. 352 (2014) 921-924 | 10.1007/s10509-014-1955-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study accelerating dynamics from Born-Infeld-$f(R)$ gravity in a
simplified conformal approach without matter. In our work (A.N. Makarenko, S.
Odintsov, G.J. Olmo, Phys.Lett. B734 (2014) 36, [arXiv:1403.2850]) it was
derived eventually any Dark Energy cosmology from above theory. In this Letter
we apply the techni... | [
{
"created": "Fri, 6 Jun 2014 15:23:25 GMT",
"version": "v1"
}
] | 2014-07-22 | [
[
"Makarenko",
"Andrey N.",
""
]
] | We study accelerating dynamics from Born-Infeld-$f(R)$ gravity in a simplified conformal approach without matter. In our work (A.N. Makarenko, S. Odintsov, G.J. Olmo, Phys.Lett. B734 (2014) 36, [arXiv:1403.2850]) it was derived eventually any Dark Energy cosmology from above theory. In this Letter we apply the techniqu... |
1802.06596 | Michael Kalisch | Michael Kalisch | Numerical construction and critical behavior of Kaluza-Klein black holes | This PhD thesis is based on arXiv:1607.03099 and arXiv:1706.02323 but
it provides a wider introduction and a more detailed discussion of the
pseudo-spectral method used in this work | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The idea of extra dimensions provides a promising approach to overcome
various problems in modern physics. This includes theoretical as well as
phenomenological aspects, such as the unification of the fundamental
interactions or the hierarchy problem. Based on the seminal works by Kaluza and
Klein that were published... | [
{
"created": "Mon, 19 Feb 2018 11:59:17 GMT",
"version": "v1"
}
] | 2018-02-20 | [
[
"Kalisch",
"Michael",
""
]
] | The idea of extra dimensions provides a promising approach to overcome various problems in modern physics. This includes theoretical as well as phenomenological aspects, such as the unification of the fundamental interactions or the hierarchy problem. Based on the seminal works by Kaluza and Klein that were published n... |
2111.12693 | Albert Escriv\`a | Albert Escriv\`a | PBH formation from spherically symmetric hydrodynamical perturbations: a
review | Invited review article. Published in the "Universe" journal on the
Special Issue: Primordial Black Holes from Inflation. Feature Paper. 60 pages
and 24 figures. v3: matches the published version | Universe 2022, 8(2), 66 | 10.3390/universe8020066 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial black holes, which could have been formed in the very early
Universe due to the collapse of large curvature fluctuations, are nowadays one
of the most attractive and fascinating research areas in cosmology for their
possible theoretical and observational implications. This review article
presents the curre... | [
{
"created": "Wed, 24 Nov 2021 18:42:16 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2022 17:23:34 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jan 2022 18:16:28 GMT",
"version": "v3"
}
] | 2022-01-27 | [
[
"Escrivà",
"Albert",
""
]
] | Primordial black holes, which could have been formed in the very early Universe due to the collapse of large curvature fluctuations, are nowadays one of the most attractive and fascinating research areas in cosmology for their possible theoretical and observational implications. This review article presents the current... |
gr-qc/9605021 | Franz Embacher | Franz Embacher | Quantum cosmology in the energy representation | 38 pages, LaTeX (no figures), referenced updated | Nucl.Phys. B479 (1996) 461-494 | 10.1016/0550-3213(96)00444-0 | UWThPh-1996-32 | gr-qc | null | The Hawking minisuperspace model (closed FRW geometry with a homogeneous
massive scalar field) provides a fairly non-trivial testing ground for
fundamental problems in quantum cosmology. We provide evidence that the
Wheeler-DeWitt equation admits a basis of solutions that is distinguished by
analyticity properities i... | [
{
"created": "Thu, 9 May 1996 17:46:16 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 1996 12:29:14 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Embacher",
"Franz",
""
]
] | The Hawking minisuperspace model (closed FRW geometry with a homogeneous massive scalar field) provides a fairly non-trivial testing ground for fundamental problems in quantum cosmology. We provide evidence that the Wheeler-DeWitt equation admits a basis of solutions that is distinguished by analyticity properities in ... |
2206.11874 | Zichang Huang | Zichang Huang, Shan Huang, Yidun Wan | A saddle-point finder and its application to the spin foam model | 27 pages, 4 figures | null | 10.1103/PhysRevD.107.046011 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a saddle-point finder that can find the complex saddle points
for any analytically continued action. We showcase our saddle-point finder by
two examples in the EPRL spin foam model: the single vertex case and the case
of triangulation $\Delta_3$. In both cases, the complex saddle points are
found, and ea... | [
{
"created": "Thu, 23 Jun 2022 17:26:44 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Huang",
"Zichang",
""
],
[
"Huang",
"Shan",
""
],
[
"Wan",
"Yidun",
""
]
] | We introduce a saddle-point finder that can find the complex saddle points for any analytically continued action. We showcase our saddle-point finder by two examples in the EPRL spin foam model: the single vertex case and the case of triangulation $\Delta_3$. In both cases, the complex saddle points are found, and each... |
1110.1191 | Amare Abebe Mr | Amare Abebe, Mohamed Abdelwahab, Alvaro de la Cruz-Dombriz, Peter K.
S. Dunsby | Covariant gauge-invariant perturbations in multifluid f(R) gravity | 32 pages, 3 figures, published version | Class. Quantum Grav. 29 (2012) 135011 | 10.1088/0264-9381/29/13/135011 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of scalar cosmological perturbations in the (1+3)-
covariant gauge-invariant formalism for generic $f(R)$ theories of gravity.
Extending previous works, we give a complete set of equations describing the
evolution of matter and curvature fluctuations for a multi-fluid cosmological
medium. We th... | [
{
"created": "Thu, 6 Oct 2011 09:03:43 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2011 11:44:45 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jun 2012 11:43:28 GMT",
"version": "v3"
}
] | 2012-06-08 | [
[
"Abebe",
"Amare",
""
],
[
"Abdelwahab",
"Mohamed",
""
],
[
"de la Cruz-Dombriz",
"Alvaro",
""
],
[
"Dunsby",
"Peter K. S.",
""
]
] | We study the evolution of scalar cosmological perturbations in the (1+3)- covariant gauge-invariant formalism for generic $f(R)$ theories of gravity. Extending previous works, we give a complete set of equations describing the evolution of matter and curvature fluctuations for a multi-fluid cosmological medium. We then... |
1903.07779 | Alexander Saffer | Alexander Saffer, Hector O. Silva, and Nico Yunes | The exterior spacetime of relativistic stars in scalar-Gauss-Bonnet
gravity | 13 pages, 9 figures. Updated to published version. Corrected typos | Phys. Rev. D 100, 044030 (2019) | 10.1103/PhysRevD.100.044030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacetime around compact objects is an excellent place to study gravity
in the strong, nonlinear, dynamical regime where solar system tests cannot
account for the effects of large curvature. Understanding the dynamics of this
spacetime is important for testing theories of gravity and probing a regime
which has no... | [
{
"created": "Tue, 19 Mar 2019 00:39:49 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Aug 2019 20:28:54 GMT",
"version": "v2"
}
] | 2019-09-02 | [
[
"Saffer",
"Alexander",
""
],
[
"Silva",
"Hector O.",
""
],
[
"Yunes",
"Nico",
""
]
] | The spacetime around compact objects is an excellent place to study gravity in the strong, nonlinear, dynamical regime where solar system tests cannot account for the effects of large curvature. Understanding the dynamics of this spacetime is important for testing theories of gravity and probing a regime which has not ... |
gr-qc/0306096 | Neil J. Cornish | Neil J. Cornish and Ronald W. Hellings | The Effects of Orbital Motion on LISA Time Delay Interferometry | 12 pages, 2 figures | Class.Quant.Grav.20:4851-4860,2003 | 10.1088/0264-9381/20/22/009 | null | gr-qc | null | In an effort to eliminate laser phase noise in laser interferometer
spaceborne gravitational wave detectors, several combinations of signals have
been found that allow the laser noise to be canceled out while gravitational
wave signals remain. This process is called time delay interferometry (TDI). In
the papers that... | [
{
"created": "Fri, 20 Jun 2003 19:54:14 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Jun 2003 00:59:50 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Cornish",
"Neil J.",
""
],
[
"Hellings",
"Ronald W.",
""
]
] | In an effort to eliminate laser phase noise in laser interferometer spaceborne gravitational wave detectors, several combinations of signals have been found that allow the laser noise to be canceled out while gravitational wave signals remain. This process is called time delay interferometry (TDI). In the papers that d... |
gr-qc/0012063 | Graham Shore | G.M. Shore | Accelerating Photons with Gravitational Radiation | 14 pages, TeX, uses harvmac | Nucl.Phys. B605 (2001) 455-466 | 10.1016/S0550-3213(01)00137-7 | CERN-TH/2000-285, SWAT/266, UGVA-DPT-00-9-1088 | gr-qc | null | The nature of superluminal photon propagation in the gravitational field
describing radiation from a time-dependent, isolated source (the Bondi-Sachs
metric) is considered in an effective theory which includes interactions which
violate the strong equivalence principle. Such interactions are, for example,
generated b... | [
{
"created": "Sun, 17 Dec 2000 13:02:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Shore",
"G. M.",
""
]
] | The nature of superluminal photon propagation in the gravitational field describing radiation from a time-dependent, isolated source (the Bondi-Sachs metric) is considered in an effective theory which includes interactions which violate the strong equivalence principle. Such interactions are, for example, generated by ... |
gr-qc/0404084 | Miguel Sanchez | Antonio N. Bernal and Miguel S\'anchez | Smooth globally hyperbolic splittings and temporal functions | 11 pages, Contribution to Proc. II Int. Meeting on Lorentzian
Geometry, Murcia (Spain), November 12-14, 2003 | null | null | null | gr-qc math.DG | null | Geroch's theorem about the splitting of globally hyperbolic spacetimes is a
central result in global Lorentzian Geometry. Nevertheless, this result was
obtained at a topological level, and the possibility to obtain a metric (or, at
least, smooth) version has been controversial since its publication in 1970. In
fact, ... | [
{
"created": "Tue, 20 Apr 2004 09:48:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bernal",
"Antonio N.",
""
],
[
"Sánchez",
"Miguel",
""
]
] | Geroch's theorem about the splitting of globally hyperbolic spacetimes is a central result in global Lorentzian Geometry. Nevertheless, this result was obtained at a topological level, and the possibility to obtain a metric (or, at least, smooth) version has been controversial since its publication in 1970. In fact, th... |
2207.13822 | Bogeun Gwak | Bogeun Gwak | Weak Cosmic Censorship Conjecture in Myers-Perry Black Hole with
Separability | 17 pages, 3 figures | JCAP 10 (2022) 077 | 10.1088/1475-7516/2022/10/077 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the weak cosmic censorship conjecture in Myers-Perry black
holes with arbitrary rotations in general dimensions based on the scattering of
a massless scalar field. From the fluxes of the scalar field flowing into the
black hole, the changes in mass and angular momenta of the black hole are
obtained. Ho... | [
{
"created": "Wed, 27 Jul 2022 23:08:14 GMT",
"version": "v1"
}
] | 2022-10-28 | [
[
"Gwak",
"Bogeun",
""
]
] | We investigate the weak cosmic censorship conjecture in Myers-Perry black holes with arbitrary rotations in general dimensions based on the scattering of a massless scalar field. From the fluxes of the scalar field flowing into the black hole, the changes in mass and angular momenta of the black hole are obtained. Howe... |
gr-qc/9602017 | null | Roy Maartens and Conrad Mellin | Anisotropic universes with conformal motion | 8 pages, latex | Class. Quant. Grav. 13 (1996) 1571 | 10.1088/0264-9381/13/6/021 | RCG 96/4 | gr-qc | null | By imposing natural geometrical and kinematical conditions on a conformal
Killing vector in Bianchi I spacetime, we show that a class of axisymmetric
metrics admits a conformal motion. This class contains new exact solutions of
Einstein's equations, including anisotropic radiation universes that isotropise
at late ti... | [
{
"created": "Fri, 9 Feb 1996 18:11:17 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Maartens",
"Roy",
""
],
[
"Mellin",
"Conrad",
""
]
] | By imposing natural geometrical and kinematical conditions on a conformal Killing vector in Bianchi I spacetime, we show that a class of axisymmetric metrics admits a conformal motion. This class contains new exact solutions of Einstein's equations, including anisotropic radiation universes that isotropise at late time... |
0810.4786 | David Brizuela | David Brizuela, Jose M. Martin-Garcia | Hamiltonian theory for the axial perturbations of a dynamical spherical
background | 12 pages, accepted by Classical and Quantum Gravity | Class.Quant.Grav.26:015003,2009 | 10.1088/0264-9381/26/1/015003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the Hamiltonian theory of axial perturbations around a general
time-dependent spherical background spacetime. Using the fact that the
linearized constraints are gauge generators, we isolate the physical and
unconstrained axial gravitational wave in a Hamiltonian pair of variables.
Then, switching to a more... | [
{
"created": "Mon, 27 Oct 2008 11:10:35 GMT",
"version": "v1"
}
] | 2009-02-09 | [
[
"Brizuela",
"David",
""
],
[
"Martin-Garcia",
"Jose M.",
""
]
] | We develop the Hamiltonian theory of axial perturbations around a general time-dependent spherical background spacetime. Using the fact that the linearized constraints are gauge generators, we isolate the physical and unconstrained axial gravitational wave in a Hamiltonian pair of variables. Then, switching to a more g... |
1005.2327 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | Black hole entropy in scalar-tensor and f(R) gravity: an overview | 24 pages, latex, to appear in "Entropy in Quantum Gravity", special
issue of Entropy, R. Garattini editor. | null | 10.3390/e12051246 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A short overview of black hole entropy in alternative gravitational theories
is presented. Motivated by the recent attempts to explain the cosmic
acceleration without dark energy, we focus on metric and Palatini f(R) gravity
and on scalar-tensor theories.
| [
{
"created": "Thu, 13 May 2010 14:21:55 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | A short overview of black hole entropy in alternative gravitational theories is presented. Motivated by the recent attempts to explain the cosmic acceleration without dark energy, we focus on metric and Palatini f(R) gravity and on scalar-tensor theories. |
gr-qc/9309008 | null | Pedro F. Gonzalez-Diaz | Quantum State and Spontaneous Symmetry Breaking in Gravity | 4p | Int.J.Mod.Phys.D3:191-194,1994 | 10.1142/S0218271894000265 | IMAFF-RC-05-93 | gr-qc | null | A spontaneous symmetry breaking mechanism is used in quantum gravity to
obtain a convergent positive definite density-matrix as the most general
quantum state of Euclidean wormholes
| [
{
"created": "Mon, 13 Sep 1993 17:12:54 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Gonzalez-Diaz",
"Pedro F.",
""
]
] | A spontaneous symmetry breaking mechanism is used in quantum gravity to obtain a convergent positive definite density-matrix as the most general quantum state of Euclidean wormholes |
2105.00646 | Heba Sami | Heba Sami, Shambel Sahlu, Amare Abebe and Peter K. S. Dunsby | Covariant density and velocity perturbations of the quasi-Newtonian
cosmological model in $f(T)$ gravity | 30 pages, 8 figures. arXiv admin note: substantial text overlap with
arXiv:2012.06721 | null | 10.1140/epjc/s10052-021-09615-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate classes of shear-free cosmological dust models with
irrotational fluid flows within the framework of $f(T)$ gravity. In particular,
we use the $1 + 3$ covariant formalism and present the covariant linearised
evolution and constraint equations describing such models. We then derive the
integrability con... | [
{
"created": "Mon, 3 May 2021 06:40:12 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Sami",
"Heba",
""
],
[
"Sahlu",
"Shambel",
""
],
[
"Abebe",
"Amare",
""
],
[
"Dunsby",
"Peter K. S.",
""
]
] | We investigate classes of shear-free cosmological dust models with irrotational fluid flows within the framework of $f(T)$ gravity. In particular, we use the $1 + 3$ covariant formalism and present the covariant linearised evolution and constraint equations describing such models. We then derive the integrability condi... |
0812.0110 | Clifford M. Will | Clifford M. Will | Carter-like constants of the motion in Newtonian gravity and
electrodynamics | 4 pages | Phys.Rev.Lett.102:061101,2009 | 10.1103/PhysRevLett.102.061101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a test body orbiting an axisymmetric body in Newtonian gravitational
theory with multipole moments Q_L, (and for a charge in a non-relativistic
orbit about a charge distribution with the same multipole moments) we show that
there exists, in addition to the energy and angular momentum component along
the symmetry ... | [
{
"created": "Sat, 29 Nov 2008 21:50:16 GMT",
"version": "v1"
}
] | 2009-02-27 | [
[
"Will",
"Clifford M.",
""
]
] | For a test body orbiting an axisymmetric body in Newtonian gravitational theory with multipole moments Q_L, (and for a charge in a non-relativistic orbit about a charge distribution with the same multipole moments) we show that there exists, in addition to the energy and angular momentum component along the symmetry ax... |
2011.01605 | Hiroaki Tahara | Hiroaki W. H. Tahara, Tsutomu Kobayashi | Nanohertz gravitational waves from NEC violation in the early universe | 11 pages, 8 figures | Phys. Rev. D 102, 123533 (2020) | 10.1103/PhysRevD.102.123533 | RUP-20-32 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study nanohertz gravitational waves relevant to pulsar timing array
experiments from quantum fluctuations in the early universe with null energy
condition (NEC) violation. The NEC violation admits accelerated expansion with
the scale factor $a\propto (-t)^{-p}$ ($p>0$), which gives the tensor spectral
index $n_t=2... | [
{
"created": "Tue, 3 Nov 2020 10:19:42 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2020 07:21:35 GMT",
"version": "v2"
}
] | 2021-01-04 | [
[
"Tahara",
"Hiroaki W. H.",
""
],
[
"Kobayashi",
"Tsutomu",
""
]
] | We study nanohertz gravitational waves relevant to pulsar timing array experiments from quantum fluctuations in the early universe with null energy condition (NEC) violation. The NEC violation admits accelerated expansion with the scale factor $a\propto (-t)^{-p}$ ($p>0$), which gives the tensor spectral index $n_t=2/(... |
1010.1031 | Taylor Hughes | Andrew Randono and Taylor L. Hughes | Torsional Monopoles and Torqued Geometries in Gravity and Condensed
Matter | 4+epsilon, 1 figure | Phys.Rev.Lett.106:161102,2011 | 10.1103/PhysRevLett.106.161102 | null | gr-qc cond-mat.other hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Torsional degrees of freedom play an important role in modern gravity
theories as well as in condensed matter systems where they can be modeled by
defects in solids. Here we isolate a class of torsion models that support
torsion configurations with a localized, conserved charge that adopts integer
values. The charge ... | [
{
"created": "Tue, 5 Oct 2010 21:57:07 GMT",
"version": "v1"
}
] | 2012-06-15 | [
[
"Randono",
"Andrew",
""
],
[
"Hughes",
"Taylor L.",
""
]
] | Torsional degrees of freedom play an important role in modern gravity theories as well as in condensed matter systems where they can be modeled by defects in solids. Here we isolate a class of torsion models that support torsion configurations with a localized, conserved charge that adopts integer values. The charge is... |
2305.18537 | Damianos Iosifidis | Damianos Iosifidis, Konstantinos Pallikaris | Biconnection Gravity as a Statistical Manifold | 16 pages, no figures | null | null | null | gr-qc cs.IT hep-th math.IT | http://creativecommons.org/licenses/by/4.0/ | We formulate a bi-Connection Theory of Gravity whose Gravitational action
consists of a recently defined mutual curvature scalar. Namely, we build a
gravitational theory consisting of one metric and two affine connections, in a
Metric-Affine Gravity setup. Consequently, coupling the two connections on an
equal footin... | [
{
"created": "Mon, 29 May 2023 18:09:06 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Aug 2023 16:30:30 GMT",
"version": "v2"
}
] | 2023-08-23 | [
[
"Iosifidis",
"Damianos",
""
],
[
"Pallikaris",
"Konstantinos",
""
]
] | We formulate a bi-Connection Theory of Gravity whose Gravitational action consists of a recently defined mutual curvature scalar. Namely, we build a gravitational theory consisting of one metric and two affine connections, in a Metric-Affine Gravity setup. Consequently, coupling the two connections on an equal footing ... |
1402.2848 | Sergio Dain | Sergio Dain and Ivan Gentile de Austria | On the linear stability of the extreme Kerr black hole under axially
symmetric perturbations | 35 pages. 2 figures. Relevant improvement in the presentation in
section 2.2 | Class. Quantum Grav. 31 195009, 2014 | 10.1088/0264-9381/31/19/195009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that for axially symmetric linear gravitational perturbations of the
extreme Kerr black hole there exists a positive definite and conserved energy.
This provides a basic criteria for linear stability in axial symmetry. In the
particular case of Minkowski, using this energy we also prove pointwise
boundedness... | [
{
"created": "Wed, 12 Feb 2014 15:20:21 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Sep 2014 13:40:28 GMT",
"version": "v2"
}
] | 2014-09-22 | [
[
"Dain",
"Sergio",
""
],
[
"de Austria",
"Ivan Gentile",
""
]
] | We prove that for axially symmetric linear gravitational perturbations of the extreme Kerr black hole there exists a positive definite and conserved energy. This provides a basic criteria for linear stability in axial symmetry. In the particular case of Minkowski, using this energy we also prove pointwise boundedness o... |
1911.04896 | Haomin Rao | Haomin Rao, Dehao Zhao | Eddington-inspired Born-Infeld Gravity with Varying Cosmological
Constant | 7 pages, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we modify the EiBI model to realize a varying cosmological
constant which is determined by matter distribution. We find that the Newton's
constant is also variable and its change is related to the change of
cosmological constant. And then we study its cosmological behavior. We find
that the early univer... | [
{
"created": "Tue, 12 Nov 2019 14:39:01 GMT",
"version": "v1"
}
] | 2019-11-13 | [
[
"Rao",
"Haomin",
""
],
[
"Zhao",
"Dehao",
""
]
] | In this paper we modify the EiBI model to realize a varying cosmological constant which is determined by matter distribution. We find that the Newton's constant is also variable and its change is related to the change of cosmological constant. And then we study its cosmological behavior. We find that the early universe... |
1308.4390 | Alfonso Garc\'ia-Parrado G\'omez-Lobo Dr. | Alfonso Garc\'ia-Parrado G\'omez-Lobo | On the conservation of Superenergy and its applications | 11 pages, 1 figure. Section 5 is new. Minor change in the title to
take this into account (see abstract). To appear in "Classical and Quantum
Gravity" | null | 10.1088/0264-9381/31/13/135008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present a geometric identity involving the Bel-Robinson
tensor which is formally similar to the Sparling identity (which involves the
Einstein tensor through the Einstein 3-form). In our identity the Bel-Robinson
tensor enters through the {\em Bel-Robinson 3-form} which, we believe, is
introduced in t... | [
{
"created": "Tue, 20 Aug 2013 19:29:44 GMT",
"version": "v1"
},
{
"created": "Sat, 3 May 2014 17:27:42 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Gómez-Lobo",
"Alfonso García-Parrado",
""
]
] | In this work we present a geometric identity involving the Bel-Robinson tensor which is formally similar to the Sparling identity (which involves the Einstein tensor through the Einstein 3-form). In our identity the Bel-Robinson tensor enters through the {\em Bel-Robinson 3-form} which, we believe, is introduced in the... |
gr-qc/9801040 | Manoelito Martins de Souza | Manoelito M. de Souza and Robson N. Silveira | Discrete and finite Genral Relativity | Modified conform the version to appear in Classical and Quantum
Gravity | Class.Quant.Grav. 16 (1999) 619-630 | 10.1088/0264-9381/16/2/023 | UFES-DF-MMS-98/1 | gr-qc hep-ph hep-th | null | We develop the General Theory of Relativity in a formalism with extended
causality that describes physical interaction through discrete, transversal and
localized pointlike fields. The homogeneous field equations are then solved for
a finite, singularity-free, point-like field that we associate to a ``classical
gravi... | [
{
"created": "Tue, 13 Jan 1998 01:07:23 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Feb 1998 21:33:13 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Nov 1998 20:39:35 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"de Souza",
"Manoelito M.",
""
],
[
"Silveira",
"Robson N.",
""
]
] | We develop the General Theory of Relativity in a formalism with extended causality that describes physical interaction through discrete, transversal and localized pointlike fields. The homogeneous field equations are then solved for a finite, singularity-free, point-like field that we associate to a ``classical gravito... |
gr-qc/0701078 | Jia-Rui Sun | Chao-Guang Huang and Jia-Rui Sun | Thermodynamic Properties of Spherically-Symmetric, Uniformly-Accelerated
Reference Frames | 8 pages | Commun.Theor.Phys.49:928-932,2008 | 10.1088/0253-6102/49/4/26 | null | gr-qc | null | We aim to study the thermodynamic properties of the spherically symmetric
reference frames with uniform acceleration, including the spherically symmetric
generalization of Rindler reference frame and the new kind of uniformly
accelerated reference frame. We find that, unlike the general studies about the
horizon ther... | [
{
"created": "Mon, 15 Jan 2007 12:19:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Huang",
"Chao-Guang",
""
],
[
"Sun",
"Jia-Rui",
""
]
] | We aim to study the thermodynamic properties of the spherically symmetric reference frames with uniform acceleration, including the spherically symmetric generalization of Rindler reference frame and the new kind of uniformly accelerated reference frame. We find that, unlike the general studies about the horizon thermo... |
0704.3963 | Andreas Mueller | Andreas Mueller and Bernd Aschenbach | Non-monotonic orbital velocity profiles around rapidly rotating
Kerr-(anti-)de Sitter black holes | 9 pages, 4 figures, accepted for Class. Quant. Grav | Class.Quant.Grav.24:2637-2644,2007 | 10.1088/0264-9381/24/10/009 | null | gr-qc astro-ph | null | It has been recently demonstrated that the orbital velocity profile around
Kerr black holes in the equatorial plane as observed in the locally
non-rotating frame exhibits a non-monotonic radial behaviour. We show here that
this unexpected minimum-maximum feature of the orbital velocity remains if the
Kerr vacuum is g... | [
{
"created": "Mon, 30 Apr 2007 15:32:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mueller",
"Andreas",
""
],
[
"Aschenbach",
"Bernd",
""
]
] | It has been recently demonstrated that the orbital velocity profile around Kerr black holes in the equatorial plane as observed in the locally non-rotating frame exhibits a non-monotonic radial behaviour. We show here that this unexpected minimum-maximum feature of the orbital velocity remains if the Kerr vacuum is gen... |
gr-qc/0604086 | Luca Lusanna | David Alba (Firenze Univ.) and Luca Lusanna (INFN, Firenze) | The York map as a Shanmugadhasan canonical transformation in tetrad
gravity and the role of non-inertial frames in the geometrical view of the
gravitational field | 90 pages | Gen.Rel.Grav.39:2149-2203,2007 | 10.1007/s10714-007-0507-2 | null | gr-qc astro-ph hep-th | null | A new parametrization of the 3-metric allows to find explicitly a York map in
canonical ADM tetrad gravity, the two pairs of physical tidal degrees of
freedom and 14 gauge variables. These gauge quantities (generalized inertial
effects) are all configurational except the trace ${}^3K(\tau ,\vec \sigma)$ of
the extrin... | [
{
"created": "Thu, 20 Apr 2006 10:40:28 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Aug 2007 10:40:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alba",
"David",
"",
"Firenze Univ."
],
[
"Lusanna",
"Luca",
"",
"INFN, Firenze"
]
] | A new parametrization of the 3-metric allows to find explicitly a York map in canonical ADM tetrad gravity, the two pairs of physical tidal degrees of freedom and 14 gauge variables. These gauge quantities (generalized inertial effects) are all configurational except the trace ${}^3K(\tau ,\vec \sigma)$ of the extrinsi... |
2009.12306 | Zbigniew Haba | Z. Haba | State-dependent graviton noise in the equation of geodesic deviation | 11 pages | Eur.Phys.J.C81,40(2021) | 10.1140/epjc/s10052-020-08805-y | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an equation of the geodesic deviation appearing in the problem of
gravitational wave detection in an environment of gravitons. We investigate a
state-dependent graviton noise (as discussed in a recent paper of
Parikh,Wilczek and Zahariade) from the point of view of the Feynman integral
and stochastic diff... | [
{
"created": "Fri, 25 Sep 2020 15:59:20 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 2020 18:57:13 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Jan 2021 12:47:17 GMT",
"version": "v3"
}
] | 2021-01-19 | [
[
"Haba",
"Z.",
""
]
] | We consider an equation of the geodesic deviation appearing in the problem of gravitational wave detection in an environment of gravitons. We investigate a state-dependent graviton noise (as discussed in a recent paper of Parikh,Wilczek and Zahariade) from the point of view of the Feynman integral and stochastic differ... |
2109.10663 | Fabio M. Mele | Fabio M. Mele, Johannes M\"unch | The Physical Relevance of the Fiducial Cell in Loop Quantum Cosmology | Published version, 13 pages (REVTeX format), 1 figure. Minor
clarifications added | Phys. Rev. D 108, 106004 (2023) | 10.1103/PhysRevD.108.106004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A common way to avoid divergent integrals in homogeneous spatially
non-compact gravitational systems is to introduce a fiducial cell by
cutting-off the spatial slice at a finite region $V_o$. This is usually
considered as an auxiliary regulator to be removed after computations by
sending $V_o\to\infty$. In this paper... | [
{
"created": "Wed, 22 Sep 2021 11:41:34 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 2023 19:00:02 GMT",
"version": "v2"
}
] | 2024-01-25 | [
[
"Mele",
"Fabio M.",
""
],
[
"Münch",
"Johannes",
""
]
] | A common way to avoid divergent integrals in homogeneous spatially non-compact gravitational systems is to introduce a fiducial cell by cutting-off the spatial slice at a finite region $V_o$. This is usually considered as an auxiliary regulator to be removed after computations by sending $V_o\to\infty$. In this paper, ... |
1905.01618 | Hai-Qing Zhang | Xiao-Xiong Zeng and Hai-Qing Zhang | Thermodynamics and weak cosmic censorship conjecture in the Kerr-AdS
black hole | 21 pages, 2 figures; References added; Version compatible with NPB | Nucl.Phys.B 959 (2020) 115162 | 10.1016/j.nuclphysb.2020.115162 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the laws of thermodynamics and weak cosmic censorship
conjecture in the normal and extended phase space of a Kerr-AdS black hole by
analyzing the energy-momentum relation of the absorbed fermion dropping into
the horizon. In the normal phase space, the first law, second law as well as
the weak cosmic c... | [
{
"created": "Sun, 5 May 2019 06:36:04 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Sep 2020 11:20:32 GMT",
"version": "v2"
}
] | 2020-09-29 | [
[
"Zeng",
"Xiao-Xiong",
""
],
[
"Zhang",
"Hai-Qing",
""
]
] | We investigate the laws of thermodynamics and weak cosmic censorship conjecture in the normal and extended phase space of a Kerr-AdS black hole by analyzing the energy-momentum relation of the absorbed fermion dropping into the horizon. In the normal phase space, the first law, second law as well as the weak cosmic cen... |
0804.3827 | Zhong Chao Wu | Zhong Chao Wu | Inverse Temperature 4-vector in Special Relativity | 11 pages, revised version | Europhys.Lett.88:20005,2009 | 10.1209/0295-5075/88/20005 | ZJUT-0803 | gr-qc astro-ph cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There exist several prescriptions for identifying the notion of temperature
in special relativity. We argue that the inverse temperature 4-vector $\bf
\beta$ is the only viable option from the laws of thermodynamics, and $\bf
\beta$ is a future-directed timelike 4-vector. Using a superfluidity thought
experiment, one... | [
{
"created": "Thu, 24 Apr 2008 19:54:48 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Apr 2008 16:03:28 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Mar 2009 20:27:09 GMT",
"version": "v3"
},
{
"created": "Wed, 11 Nov 2009 22:11:32 GMT",
"version": "v4"
}
] | 2009-11-12 | [
[
"Wu",
"Zhong Chao",
""
]
] | There exist several prescriptions for identifying the notion of temperature in special relativity. We argue that the inverse temperature 4-vector $\bf \beta$ is the only viable option from the laws of thermodynamics, and $\bf \beta$ is a future-directed timelike 4-vector. Using a superfluidity thought experiment, one c... |
2406.11719 | Moreshwar Tayde | Moreshwar Tayde, P.K. Sahoo | Exploring wormhole solutions with global monopole charge in the context
of $f(Q)$ gravity | EPJ C published version | Eur. Phys. J. C 84 (2024) 643 | 10.1140/epjc/s10052-024-13002-2 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | This study explores the potential existence of traversable wormholes
influenced by a global monopole charge within the $f(Q)$ gravity framework. To
elucidate the characteristics of these wormholes, we conducted a comprehensive
analysis of wormhole solutions employing three different forms of redshift
function under a... | [
{
"created": "Mon, 17 Jun 2024 16:38:10 GMT",
"version": "v1"
}
] | 2024-06-26 | [
[
"Tayde",
"Moreshwar",
""
],
[
"Sahoo",
"P. K.",
""
]
] | This study explores the potential existence of traversable wormholes influenced by a global monopole charge within the $f(Q)$ gravity framework. To elucidate the characteristics of these wormholes, we conducted a comprehensive analysis of wormhole solutions employing three different forms of redshift function under a l... |
1212.4921 | Jun Wang | Jun Wang, Ya-Bo Wu, Yong-Xin Guo, Wei-Qiang Yang, Lei Wang | Energy Conditions and Stability in generalized $f(R)$ gravity with
arbitrary coupling between matter and geometry | 12 pages. arXiv admin note: substantial text overlap with
arXiv:1203.5593, arXiv:1212.4656 | Phys. Lett. B 689 (2010) 133-138 | 10.1016/j.physletb.2010.04.063 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The energy conditions and the Dolgov-Kawasaki criterion in generalized $f(R)$
gravity with arbitrary coupling between matter and geometry are derived in this
paper, which are quite general and can degenerate to the well-known energy
conditions in GR and $f(R)$ gravity with non-minimal coupling and non-coupling
as spe... | [
{
"created": "Thu, 20 Dec 2012 04:44:17 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Wang",
"Jun",
""
],
[
"Wu",
"Ya-Bo",
""
],
[
"Guo",
"Yong-Xin",
""
],
[
"Yang",
"Wei-Qiang",
""
],
[
"Wang",
"Lei",
""
]
] | The energy conditions and the Dolgov-Kawasaki criterion in generalized $f(R)$ gravity with arbitrary coupling between matter and geometry are derived in this paper, which are quite general and can degenerate to the well-known energy conditions in GR and $f(R)$ gravity with non-minimal coupling and non-coupling as speci... |
1205.1108 | Sergei Rubin | A. A. Kirillov, A. A. Korotkevich and S.G. Rubin | Emergence of symmetries | 9 pages | Physics Letters B 718 (2012) 237-240 | 10.1016/j.physletb.2012.10.044 | PLB28961 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism of symmetry formation is discussed in the framework of
multidimensional gravity. It is shown that this process is strictly connected
to the entropy decrease of compact space. The existence of low energy
symmetries is not postulated from the beginning. They could be absent during
the inflationary stage u... | [
{
"created": "Sat, 5 May 2012 06:55:41 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Aug 2012 20:33:09 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Oct 2012 13:12:56 GMT",
"version": "v3"
}
] | 2012-11-22 | [
[
"Kirillov",
"A. A.",
""
],
[
"Korotkevich",
"A. A.",
""
],
[
"Rubin",
"S. G.",
""
]
] | The mechanism of symmetry formation is discussed in the framework of multidimensional gravity. It is shown that this process is strictly connected to the entropy decrease of compact space. The existence of low energy symmetries is not postulated from the beginning. They could be absent during the inflationary stage und... |
gr-qc/0310068 | Daniel Grumiller | D. Grumiller, W. Kummer | How to approach Quantum Gravity - Background independence in 1+1
dimensions | 15 pages, 1 (eps-)figure, joint proceedings contribution to the
EURESCO conference "What comes beyond the Standard Model?" in Portoroz,
Slovenia, July 2003, v2: added and rearranged references, minor modifications
of text | null | null | ESI 1388, TUW-03-28 | gr-qc hep-th | null | The application of quantum theory to gravity is beset with many technical and
conceptual problems. After a short tour d'horizon of recent attempts to master
those problems by the introduction of new approaches, we show that the aim, a
background independent quantum theory of gravity, can be reached in a
particular ar... | [
{
"created": "Tue, 14 Oct 2003 10:01:40 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2003 11:49:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Grumiller",
"D.",
""
],
[
"Kummer",
"W.",
""
]
] | The application of quantum theory to gravity is beset with many technical and conceptual problems. After a short tour d'horizon of recent attempts to master those problems by the introduction of new approaches, we show that the aim, a background independent quantum theory of gravity, can be reached in a particular area... |
2311.09159 | Sudarshan Ghonge | Sudarshan Ghonge, Joshua Brandt, J. M. Sullivan, Margaret Millhouse,
Katerina Chatziioannou, James A. Clark, Tyson Littenberg, Neil Cornish,
Sophie Hourihane, and Laura Cadonati | Characterizing the efficacy of methods to subtract terrestrial transient
noise near gravitational wave events and the effects on parameter estimation | 22 pages, 17 figures | null | null | LIGO Document P2300385-v2 | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the impact of transient noise artifacts, or {\it glitches}, on
gravitational wave inference, and the efficacy of data cleaning procedures in
recovering unbiased source properties. Due to their time-frequency morphology,
broadband glitches demonstrate moderate to significant biasing of posterior
distrib... | [
{
"created": "Wed, 15 Nov 2023 17:56:42 GMT",
"version": "v1"
}
] | 2023-11-16 | [
[
"Ghonge",
"Sudarshan",
""
],
[
"Brandt",
"Joshua",
""
],
[
"Sullivan",
"J. M.",
""
],
[
"Millhouse",
"Margaret",
""
],
[
"Chatziioannou",
"Katerina",
""
],
[
"Clark",
"James A.",
""
],
[
"Littenberg",
"Tyson",
... | We investigate the impact of transient noise artifacts, or {\it glitches}, on gravitational wave inference, and the efficacy of data cleaning procedures in recovering unbiased source properties. Due to their time-frequency morphology, broadband glitches demonstrate moderate to significant biasing of posterior distribut... |
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