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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2105.08571 | Justin Ripley | William E. East and Justin L. Ripley | Dynamics of spontaneous black hole scalarization and mergers in
Einstein-scalar-Gauss-Bonnet gravity | 8 pages, 6 figures; changed to match PRL version | Phys. Rev. Lett. 127, 101102 (2021) | 10.1103/PhysRevLett.127.101102 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of black holes in Einstein-scalar-Gauss-Bonnet theories
that exhibit spontaneous black hole scalarization using recently introduced
methods for solving the full, non-perturbative equations of motion. For one
sign of the coupling parameter, non-spinning vacuum black holes are unstable to
developi... | [
{
"created": "Tue, 18 May 2021 14:54:51 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2021 12:48:21 GMT",
"version": "v2"
}
] | 2021-09-08 | [
[
"East",
"William E.",
""
],
[
"Ripley",
"Justin L.",
""
]
] | We study the dynamics of black holes in Einstein-scalar-Gauss-Bonnet theories that exhibit spontaneous black hole scalarization using recently introduced methods for solving the full, non-perturbative equations of motion. For one sign of the coupling parameter, non-spinning vacuum black holes are unstable to developing... |
1702.07387 | Miguel Sabido | A. Crespo-Hernandez, E. Mena and M. Sabido | On the Entropy of Deformed Phase Space Black Hole and the Cosmological
Constant | Accepted for publication in Entropy, 8 pages, no figures | null | 10.3390/e19030091 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the effects of noncommutative phase space deformations
on the Schwarzschild black hole. This idea has been previously studied in
{Friedmann-Robertson-Walker (FRW)} cosmology, where this "noncommutativity"
provides a simple mechanism that can explain the origin of the cosmological
constant. In t... | [
{
"created": "Thu, 23 Feb 2017 20:54:33 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Crespo-Hernandez",
"A.",
""
],
[
"Mena",
"E.",
""
],
[
"Sabido",
"M.",
""
]
] | In this paper we study the effects of noncommutative phase space deformations on the Schwarzschild black hole. This idea has been previously studied in {Friedmann-Robertson-Walker (FRW)} cosmology, where this "noncommutativity" provides a simple mechanism that can explain the origin of the cosmological constant. In thi... |
1506.08416 | Haidar Sheikhahmadi | Haidar Sheikhahmadi, Ali Aghamohammadi, Khaled Saaidi | Non-commutative and commutative vacua effects in a scalar torsion
scenario | 10 pages, Accepted for publication in Physics Letters B
(July/30/2015) | Physics Letters B 749, 231, 2015 | 10.1016/j.physletb.2015.07.075 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, the effects of non-commutative and commutative vacua on the
phase space generated by a scalar field in a scalar torsion scenario are
investigated. For both classical and quantum regimes, the commutative and
non-commutative cases are compared. To take account the effects of
non-commutativity, two well kn... | [
{
"created": "Sun, 28 Jun 2015 15:39:48 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jul 2015 07:19:18 GMT",
"version": "v2"
}
] | 2016-02-02 | [
[
"Sheikhahmadi",
"Haidar",
""
],
[
"Aghamohammadi",
"Ali",
""
],
[
"Saaidi",
"Khaled",
""
]
] | In this work, the effects of non-commutative and commutative vacua on the phase space generated by a scalar field in a scalar torsion scenario are investigated. For both classical and quantum regimes, the commutative and non-commutative cases are compared. To take account the effects of non-commutativity, two well know... |
2205.12993 | Hideki Maeda | Hideki Maeda and Tomohiro Harada | Criteria for energy conditions | 24 pages, 2 tables, no figure; v2, proof of Lemma 1 improved, section
3.4 for a minimally coupled scalar field added, final version to appear in
Classical and Quantum Gravity | Class. Quant. Grav. 39 (2022) 19, 195002 | 10.1088/1361-6382/ac8861 | RUP-22-12 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In model building studies, it is important to check the energy conditions for
the corresponding energy-momentum tensor determined by the gravitational field
equations in order to single out physically reasonable models. In this process,
one often encounters a situation where the energy-momentum tensor has one
off-dia... | [
{
"created": "Wed, 25 May 2022 18:03:19 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Aug 2022 12:02:43 GMT",
"version": "v2"
}
] | 2022-09-02 | [
[
"Maeda",
"Hideki",
""
],
[
"Harada",
"Tomohiro",
""
]
] | In model building studies, it is important to check the energy conditions for the corresponding energy-momentum tensor determined by the gravitational field equations in order to single out physically reasonable models. In this process, one often encounters a situation where the energy-momentum tensor has one off-diago... |
gr-qc/9810001 | Roy Maartens | Megan Govender (Natal), Roy Maartens (Portsmouth), Sunil Maharaj
(Natal) | Relaxational effects in radiating stellar collapse | 10 pages | Mon.Not.Roy.Astron.Soc. 310 (1999) 557 | 10.1046/j.1365-8711.1999.02963.x | null | gr-qc | null | Relaxational effects in stellar heat transport can in many cases be
significant. Relativistic Fourier-Eckart theory is inherently quasi-stationary,
and cannot incorporate these effects. The effects are naturally accounted for
in causal relativistic thermodynamics, which provides an improved approximation
to kinetic t... | [
{
"created": "Thu, 1 Oct 1998 08:46:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Govender",
"Megan",
"",
"Natal"
],
[
"Maartens",
"Roy",
"",
"Portsmouth"
],
[
"Maharaj",
"Sunil",
"",
"Natal"
]
] | Relaxational effects in stellar heat transport can in many cases be significant. Relativistic Fourier-Eckart theory is inherently quasi-stationary, and cannot incorporate these effects. The effects are naturally accounted for in causal relativistic thermodynamics, which provides an improved approximation to kinetic the... |
1407.0966 | Alfredo Lopez Ortega | A. Lopez-Ortega | Quasinormal frequencies of the Dirac field in a D-dimensional Lifshitz
black hole | 13 pages | Rev. Mex. Fis. 60 (2014) 357 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a D-dimensional Lifshitz black hole we calculate exactly the quasinormal
frequencies of a test Dirac field in the massless and zero angular eigenvalue
limits. These results are an extension of the previous calculations in which
the quasinormal frequencies of the Dirac field are determined, but in four
dimensions. ... | [
{
"created": "Thu, 3 Jul 2014 15:57:27 GMT",
"version": "v1"
}
] | 2014-09-26 | [
[
"Lopez-Ortega",
"A.",
""
]
] | In a D-dimensional Lifshitz black hole we calculate exactly the quasinormal frequencies of a test Dirac field in the massless and zero angular eigenvalue limits. These results are an extension of the previous calculations in which the quasinormal frequencies of the Dirac field are determined, but in four dimensions. We... |
0910.2022 | Vladimir S. Manko | V.S. Manko, E. Ruiz | On the equilibrium of two oppositely charged masses in general
relativity | 8 pages, 1 figure; formulas and references added, typos corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the equilibrium configurations of two spherical masses
carrying charges of opposite sign that are present in Bonnor's approximate
model for two charged particles and also in the exact double-Reissner-Nordstrom
solution are formed due to the additional electric field of the repulsive
character induced... | [
{
"created": "Sun, 11 Oct 2009 17:02:50 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2009 06:09:00 GMT",
"version": "v2"
}
] | 2009-10-21 | [
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | It is shown that the equilibrium configurations of two spherical masses carrying charges of opposite sign that are present in Bonnor's approximate model for two charged particles and also in the exact double-Reissner-Nordstrom solution are formed due to the additional electric field of the repulsive character induced i... |
1108.1622 | Khalid Saifullah | Aeeman Fatima and K. Saifullah | Thermodynamics of charged and rotating black strings | null | Astrophysics and Space Science, 341 (2012) 437 | 10.1007/s10509-012-1098-2 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study thermodynamics of cylindrically symmetric black holes. Uncharged as
well as charged and rotating objects have been discussed. We derive surface
gravity and hence the Hawking temperature and entropy for all these cases. We
correct some results in the literature and present new ones. It is seen that
thermodyna... | [
{
"created": "Mon, 8 Aug 2011 08:05:38 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Fatima",
"Aeeman",
""
],
[
"Saifullah",
"K.",
""
]
] | We study thermodynamics of cylindrically symmetric black holes. Uncharged as well as charged and rotating objects have been discussed. We derive surface gravity and hence the Hawking temperature and entropy for all these cases. We correct some results in the literature and present new ones. It is seen that thermodynami... |
2001.07680 | Isaac Torres | Isaac Torres, J\'ulio C\'esar Fabris, Oliver Fabio Piattella, and
Ant\^onio Brasil Batista | Quantum Cosmology of Fab Four John Theory with Conformable Fractional
Derivative | null | Universe 2020, 6, 50 | 10.3390/universe6040050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a quantization via fractional derivative of a nonminimal derivative
coupling cosmological theory, namely, the Fab Four John theory. Its Hamiltonian
version presents the issue of fractional powers in the momenta. That problem is
solved here by the application of the so-called conformable fractional
derivative... | [
{
"created": "Tue, 21 Jan 2020 18:11:06 GMT",
"version": "v1"
},
{
"created": "Wed, 6 May 2020 20:23:24 GMT",
"version": "v2"
}
] | 2020-05-08 | [
[
"Torres",
"Isaac",
""
],
[
"Fabris",
"Júlio César",
""
],
[
"Piattella",
"Oliver Fabio",
""
],
[
"Batista",
"Antônio Brasil",
""
]
] | We study a quantization via fractional derivative of a nonminimal derivative coupling cosmological theory, namely, the Fab Four John theory. Its Hamiltonian version presents the issue of fractional powers in the momenta. That problem is solved here by the application of the so-called conformable fractional derivative. ... |
gr-qc/0301098 | Albert V. Minkevich | A.V. Minkevich and Yu. G. Vasilevski | Spherically-symmetric gravitational fields in the metric-affine gauge
theory of gravitation | 17 pages, LaTeX 2e | null | null | null | gr-qc | null | Geometric structure of spherically-symmetric space-time in metric-affine
gauge theory of gravity is studied. Restrictions on curvature tensor and
Bianchi identities are obtained. By using certain simple gravitational
Lagrangian the solution of gravitational equations for vacuum
spherically-symmetric gravitational fie... | [
{
"created": "Fri, 24 Jan 2003 18:29:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Minkevich",
"A. V.",
""
],
[
"Vasilevski",
"Yu. G.",
""
]
] | Geometric structure of spherically-symmetric space-time in metric-affine gauge theory of gravity is studied. Restrictions on curvature tensor and Bianchi identities are obtained. By using certain simple gravitational Lagrangian the solution of gravitational equations for vacuum spherically-symmetric gravitational field... |
1310.5452 | Roberto Casadio | R. Casadio | What is the Schwarzschild radius of a quantum mechanical particle? | 6 pages, 2 figures. Prepared for the Proceedings of the Karl
Schwarzschild meeting 2013 | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A localised particle in Quantum Mechanics is described by a wave packet in
position space, regardless of its energy. However, from the point of view of
General Relativity, if the particle's energy density exceeds a certain
threshold, it should be a black hole. In order to combine these two pictures,
we introduce a ho... | [
{
"created": "Mon, 21 Oct 2013 08:01:17 GMT",
"version": "v1"
}
] | 2013-10-22 | [
[
"Casadio",
"R.",
""
]
] | A localised particle in Quantum Mechanics is described by a wave packet in position space, regardless of its energy. However, from the point of view of General Relativity, if the particle's energy density exceeds a certain threshold, it should be a black hole. In order to combine these two pictures, we introduce a hori... |
2208.00261 | Philip Relton | Philip Relton, Andrea Virtuoso, Sophie Bini, Vivien Raymond, Ian
Harry, Marco Drago, Claudia Lazzaro, Andrea Miani and Shubhanshu Tiwari | Addressing the challenges of detecting time-overlapping compact binary
coalescences | 17 pages, 12 figures, 4 tables | null | 10.1103/PhysRevD.106.104045 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Standard detection and analysis techniques for transient gravitational waves
make the assumption that detector data contains, at most, one signal at any
time. As detectors improve in sensitivity, this assumption will no longer be
valid. In this paper we examine how current search techniques for transient
gravitationa... | [
{
"created": "Sat, 30 Jul 2022 16:07:50 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 2022 09:12:55 GMT",
"version": "v2"
}
] | 2022-12-07 | [
[
"Relton",
"Philip",
""
],
[
"Virtuoso",
"Andrea",
""
],
[
"Bini",
"Sophie",
""
],
[
"Raymond",
"Vivien",
""
],
[
"Harry",
"Ian",
""
],
[
"Drago",
"Marco",
""
],
[
"Lazzaro",
"Claudia",
""
],
[
"Mian... | Standard detection and analysis techniques for transient gravitational waves make the assumption that detector data contains, at most, one signal at any time. As detectors improve in sensitivity, this assumption will no longer be valid. In this paper we examine how current search techniques for transient gravitational ... |
1609.04959 | Yi-Peng Wu | Yi-Peng Wu | Inflation with teleparallelism: Can torsion generate primordial
fluctuations without local Lorentz symmetry? | 6 pages, to be published | null | 10.1016/j.physletb.2016.09.025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Arbitrary generalization to the teleparallel equivalent of general relativity
loses local Lorentz invariance to reparametrize the orthonormal coordinate
system and gives rise to asymmetry field equations. We investigate consequences
of local Lorentz violation to primordial fluctuations in extended single field
inflat... | [
{
"created": "Fri, 16 Sep 2016 09:04:55 GMT",
"version": "v1"
}
] | 2016-11-07 | [
[
"Wu",
"Yi-Peng",
""
]
] | Arbitrary generalization to the teleparallel equivalent of general relativity loses local Lorentz invariance to reparametrize the orthonormal coordinate system and gives rise to asymmetry field equations. We investigate consequences of local Lorentz violation to primordial fluctuations in extended single field inflatio... |
1602.00620 | Alvin Chua | Alvin J. K. Chua | Augmented kludge waveforms and Gaussian process regression for EMRI data
analysis | 4 pages, 2 figures, conference proceedings for 11th Edoardo Amaldi
Conference on Gravitational Waves | J. Phys.: Conf. Ser. 716, 012028 (2016) | 10.1088/1742-6596/716/1/012028 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extreme-mass-ratio inspirals (EMRIs) will be an important type of
astrophysical source for future space-based gravitational-wave detectors. There
is a trade-off between accuracy and computational speed for the EMRI waveform
templates required in the analysis of data from these detectors. We discuss how
the systematic... | [
{
"created": "Mon, 1 Feb 2016 18:01:39 GMT",
"version": "v1"
}
] | 2016-06-03 | [
[
"Chua",
"Alvin J. K.",
""
]
] | Extreme-mass-ratio inspirals (EMRIs) will be an important type of astrophysical source for future space-based gravitational-wave detectors. There is a trade-off between accuracy and computational speed for the EMRI waveform templates required in the analysis of data from these detectors. We discuss how the systematic e... |
1211.7050 | Claudio Perini | Claudio Perini and Gabriele Nunzio Tornetta | A scale-covariant quantum space-time | 38 pages | Rev. Math. Phys. 26, 1450006 (2014) | 10.1142/S0129055X14500068 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A noncommutative space-time admitting dilation symmetry was briefly mentioned
in the seminal work of Doplicher, Fredenhagen and Roberts. In this paper we
explicitly construct the model in details and carry out an in-depth analysis.
The C*-algebra that describes this quantum space-time is determined, and it is
shown t... | [
{
"created": "Thu, 29 Nov 2012 20:55:13 GMT",
"version": "v1"
}
] | 2015-10-06 | [
[
"Perini",
"Claudio",
""
],
[
"Tornetta",
"Gabriele Nunzio",
""
]
] | A noncommutative space-time admitting dilation symmetry was briefly mentioned in the seminal work of Doplicher, Fredenhagen and Roberts. In this paper we explicitly construct the model in details and carry out an in-depth analysis. The C*-algebra that describes this quantum space-time is determined, and it is shown tha... |
2012.00361 | Megandhren Govender | Neeraj Pant, Megandhren Govender, Satyanarayana Gedela | A new class of viable and exact solutions of EFE's with Karmarkar
conditions: An application to cold star modeling | 14 pages, 15 figures | null | 10.1088/1674-4527/21/5/109 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In this work we present a theoretical framework within Einstein's classical
general relativity which models stellar compact objects such as PSR J1614-2230
and SAX J1808.4-3658. The Einstein field equations are solved by assuming that
the interior of the compact object is described by a class I spacetime. The
so-calle... | [
{
"created": "Tue, 1 Dec 2020 09:38:44 GMT",
"version": "v1"
}
] | 2021-06-23 | [
[
"Pant",
"Neeraj",
""
],
[
"Govender",
"Megandhren",
""
],
[
"Gedela",
"Satyanarayana",
""
]
] | In this work we present a theoretical framework within Einstein's classical general relativity which models stellar compact objects such as PSR J1614-2230 and SAX J1808.4-3658. The Einstein field equations are solved by assuming that the interior of the compact object is described by a class I spacetime. The so-called ... |
1911.06040 | Jerome Quintin | Jerome Quintin, Daisuke Yoshida | Cuscuton gravity as a classically stable limiting curvature theory | 23 pages; v2: minor changes, references added; v3: minor typos
corrected, matches published version | JCAP02(2020)016 | 10.1088/1475-7516/2020/02/016 | KOBE-COSMO-19-19 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Finding effective theories of modified gravity that can resolve cosmological
singularities and avoid other physical pathologies such as ghost and gradient
instabilities has turned out to be a rather difficult task. The concept of
limiting curvature, where one bounds a finite number of curvature-invariant
functions th... | [
{
"created": "Thu, 14 Nov 2019 11:11:13 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Nov 2019 09:11:04 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Feb 2020 19:41:10 GMT",
"version": "v3"
}
] | 2020-02-18 | [
[
"Quintin",
"Jerome",
""
],
[
"Yoshida",
"Daisuke",
""
]
] | Finding effective theories of modified gravity that can resolve cosmological singularities and avoid other physical pathologies such as ghost and gradient instabilities has turned out to be a rather difficult task. The concept of limiting curvature, where one bounds a finite number of curvature-invariant functions than... |
gr-qc/0610084 | Marco Valerio Battisti | Marco Valerio Battisti and Giovanni Montani | Generic Evolutionary Quantum Universe | 3 pages, proceedings of the XI Marcel Grossmann meeting on
Relativistic Astrophysics, July 23-29, 2006, Berlin | null | null | null | gr-qc | null | We consider a Schr\"odinger quantum dynamics for the gravitational field
associated to a generic cosmological model and then we solve the corresponding
eigenvalue problem. We show that, from a phenomenological point of view, an
Evolutionary Quantum Cosmology overlaps the Wheeler-DeWitt approach.
| [
{
"created": "Tue, 17 Oct 2006 12:30:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Battisti",
"Marco Valerio",
""
],
[
"Montani",
"Giovanni",
""
]
] | We consider a Schr\"odinger quantum dynamics for the gravitational field associated to a generic cosmological model and then we solve the corresponding eigenvalue problem. We show that, from a phenomenological point of view, an Evolutionary Quantum Cosmology overlaps the Wheeler-DeWitt approach. |
1801.07313 | Anzhong Wang | Bao-Fei Li, Parampreet Singh and Anzhong Wang | Towards Cosmological Dynamics from Loop Quantum Gravity | Version to appear in Phys. Rev. D97, 084029 (2018) | Phys. Rev. D 97, 084029 (2018) | 10.1103/PhysRevD.97.084029 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic study of the cosmological dynamics resulting from an
effective Hamiltonian, recently derived in loop quantum gravity using
Thiemann's regularization and earlier obtained in loop quantum cosmology (LQC)
by keeping the Lorentzian term explicit in the Hamiltonian constraint. We show
that quantum ... | [
{
"created": "Mon, 22 Jan 2018 20:44:01 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 15:42:20 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Mar 2018 13:40:19 GMT",
"version": "v3"
},
{
"created": "Thu, 19 Apr 2018 21:54:18 GMT",
"version": "v4"
}
] | 2018-04-25 | [
[
"Li",
"Bao-Fei",
""
],
[
"Singh",
"Parampreet",
""
],
[
"Wang",
"Anzhong",
""
]
] | We present a systematic study of the cosmological dynamics resulting from an effective Hamiltonian, recently derived in loop quantum gravity using Thiemann's regularization and earlier obtained in loop quantum cosmology (LQC) by keeping the Lorentzian term explicit in the Hamiltonian constraint. We show that quantum ge... |
1104.2446 | Ron Wiltshire | R.J. Wiltshire | A rotating three component perfect fluid source and its junction with
empty space-time | 14 pages | null | 10.1007/s10714-011-1317-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kerr solution for empty space-time is presented in an ellipsoidally
symmetric coordinate system and it is used to produce generalised ellipsoidal
metrics appropriate for the generation of rotating interior solutions of
Einstein's equations. It is shown that these solutions are the familiar static
perfect fluid ca... | [
{
"created": "Wed, 13 Apr 2011 11:06:41 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2011 13:27:08 GMT",
"version": "v2"
},
{
"created": "Wed, 11 May 2011 07:02:00 GMT",
"version": "v3"
},
{
"created": "Fri, 12 Aug 2011 10:22:47 GMT",
"version": "v4"
}
] | 2015-05-27 | [
[
"Wiltshire",
"R. J.",
""
]
] | The Kerr solution for empty space-time is presented in an ellipsoidally symmetric coordinate system and it is used to produce generalised ellipsoidal metrics appropriate for the generation of rotating interior solutions of Einstein's equations. It is shown that these solutions are the familiar static perfect fluid case... |
gr-qc/9505016 | null | C. Bertoni, E. Carretti, F. Finelli, A. Messina, G. Venturi | Semiclassical Gravity and Large Scale Structure | Major changes, one figure added, several points clarified. The figure
can be obtained by e-mail writing to bertoni@astbo1.bo.cnr.it | Astropart.Phys.5:167-174,1996 | 10.1016/0927-6505(96)00017-5 | null | gr-qc astro-ph hep-th | null | The possible cosmological effects of primordial fluctuation corrections to
the evolution equation of matter obtained from the Wheeler--De Witt equation
are explored. In particular, both the metric and a scalar matter field are
expanded around their homogeneous values and the corrections induced on the
scalar field fl... | [
{
"created": "Fri, 12 May 1995 07:19:13 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 1995 10:47:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bertoni",
"C.",
""
],
[
"Carretti",
"E.",
""
],
[
"Finelli",
"F.",
""
],
[
"Messina",
"A.",
""
],
[
"Venturi",
"G.",
""
]
] | The possible cosmological effects of primordial fluctuation corrections to the evolution equation of matter obtained from the Wheeler--De Witt equation are explored. In particular, both the metric and a scalar matter field are expanded around their homogeneous values and the corrections induced on the scalar field fluc... |
gr-qc/9511040 | null | G. Giachetta and G.Sardanashvily | Stress-Energy-Momentum Tensors in Lagrangian Field Theory. Part 2.
Gravitational Superpotential | 25 pp, LaTeX file | null | null | MPH/CAM/108/95 | gr-qc hep-th | null | Our investigation of differential conservation laws in Lagrangian field
theory is based on the first variational formula which provides the canonical
decomposition of the Lie derivative of a Lagrangian density by a projectable
vector field on a bundle (Part 1: gr-qc/9510061). If a Lagrangian density is
invariant unde... | [
{
"created": "Tue, 14 Nov 1995 10:26:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Giachetta",
"G.",
""
],
[
"Sardanashvily",
"G.",
""
]
] | Our investigation of differential conservation laws in Lagrangian field theory is based on the first variational formula which provides the canonical decomposition of the Lie derivative of a Lagrangian density by a projectable vector field on a bundle (Part 1: gr-qc/9510061). If a Lagrangian density is invariant under ... |
2002.08821 | Jose M. Diego Rodriguez | T. Broadhurst, J.M. Diego, G.F. Smoot | A Distant Origin For Magnified LIGO/Virgo Black Holes Implied By Binary
Component Masses | 2 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The primary and secondary masses of the binary black holes (BBH) reported by
LIGO/Virgo are correlated with a narrow dispersion that appears to increase in
proportion to mass. The mean binary mass ratio $1.45\pm0.07$ we show is
consistent with pairs drawn randomly from the mass distribution of black holes
in our Gala... | [
{
"created": "Wed, 12 Feb 2020 19:00:01 GMT",
"version": "v1"
}
] | 2020-02-21 | [
[
"Broadhurst",
"T.",
""
],
[
"Diego",
"J. M.",
""
],
[
"Smoot",
"G. F.",
""
]
] | The primary and secondary masses of the binary black holes (BBH) reported by LIGO/Virgo are correlated with a narrow dispersion that appears to increase in proportion to mass. The mean binary mass ratio $1.45\pm0.07$ we show is consistent with pairs drawn randomly from the mass distribution of black holes in our Galaxy... |
gr-qc/0406069 | Alberto Saa | Edgard Gunzig, Alberto Saa | Conformal quantum effects and the anisotropic singularities of
scalar-tensor theories of gravity | 12 pages, to appear in the proceedings of Peyresq 8 | Int.J.Theor.Phys. 43 (2004) 575-583 | 10.1023/B:IJTP.0000048165.51958.9a | null | gr-qc | null | We show that the inclusion of a term $C_{abcd}C^{abcd}$ in the action can
remove the recently described anisotropic singularity occurring on the
hypersurface $F(\phi)=0$ of scalar-tensor theories of gravity of the type $$
S=\int d^4x \sqrt{-g} {F(\phi)R - \partial_a\phi\partial^a\phi -2V(\phi)}, $$
preserving, by con... | [
{
"created": "Thu, 17 Jun 2004 01:41:59 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gunzig",
"Edgard",
""
],
[
"Saa",
"Alberto",
""
]
] | We show that the inclusion of a term $C_{abcd}C^{abcd}$ in the action can remove the recently described anisotropic singularity occurring on the hypersurface $F(\phi)=0$ of scalar-tensor theories of gravity of the type $$ S=\int d^4x \sqrt{-g} {F(\phi)R - \partial_a\phi\partial^a\phi -2V(\phi)}, $$ preserving, by const... |
0909.5625 | Jo\~ao Lopes Costa | Piotr T. Chru\'sciel, Jo\~ao Lopes Costa | Mass, angular-momentum, and charge inequalities for axisymmetric initial
data | null | Class.Quant.Grav.26:235013,2009 | 10.1088/0264-9381/26/23/235013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the key elements of the proof of an upper bound for
angular-momentum and charge in terms of the mass for electro-vacuum
asymptotically flat axisymmetric initial data sets with simply connected orbit
space.
| [
{
"created": "Wed, 30 Sep 2009 15:08:14 GMT",
"version": "v1"
}
] | 2009-12-17 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Costa",
"João Lopes",
""
]
] | We present the key elements of the proof of an upper bound for angular-momentum and charge in terms of the mass for electro-vacuum asymptotically flat axisymmetric initial data sets with simply connected orbit space. |
2006.11545 | Haruka Suzuki | Haruka Suzuki, Priti Gupta, Hirotada Okawa and Kei-ichi Maeda | Post-Newtonian Kozai-Lidov Mechanism and its Effect on Cumulative Shift
of Periastron Time of Binary Pulsar | 22 pages, 24 figures, published by MNRAS | Monthly Notices of the Royal Astronomical Society, Volume 500,
Issue 2, p.1645-1665 January 2021 | 10.1093/mnras/staa3081 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Kozai-Lidov mechanism in a hierarchical triple system in detail
by the direct integration of the first-order post Newtonian equations of
motion. We analyse a variety of models with a pulsar to evaluate the cumulative
shift of the periastron time of a binary pulsar caused by the gravitational
wave emissio... | [
{
"created": "Sat, 20 Jun 2020 10:55:23 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2020 06:06:47 GMT",
"version": "v2"
}
] | 2020-12-15 | [
[
"Suzuki",
"Haruka",
""
],
[
"Gupta",
"Priti",
""
],
[
"Okawa",
"Hirotada",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We study the Kozai-Lidov mechanism in a hierarchical triple system in detail by the direct integration of the first-order post Newtonian equations of motion. We analyse a variety of models with a pulsar to evaluate the cumulative shift of the periastron time of a binary pulsar caused by the gravitational wave emission ... |
2405.10228 | Lihan Guo | Duarte Fragoso, Lihan Guo | The fermionic double smeared null energy condition | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Energy conditions are crucial for understanding why exotic phenomena such as
traversable wormholes and closed timelike curves remain elusive. In this paper,
we prove the Double Smeared Null Energy Condition (DSNEC) for the fermionic
free theory in 4-dimensional flat Minkowski space-time, extending previous work
on th... | [
{
"created": "Thu, 16 May 2024 16:27:13 GMT",
"version": "v1"
}
] | 2024-05-17 | [
[
"Fragoso",
"Duarte",
""
],
[
"Guo",
"Lihan",
""
]
] | Energy conditions are crucial for understanding why exotic phenomena such as traversable wormholes and closed timelike curves remain elusive. In this paper, we prove the Double Smeared Null Energy Condition (DSNEC) for the fermionic free theory in 4-dimensional flat Minkowski space-time, extending previous work on the ... |
2005.08196 | Anton Sheykin | A. A. Sheykin, S. N. Manida | Universal constants and natural systems of units in a spacetime of
arbitrary dimension | 18 pages, pedagogical article. v3: small corrections and extensions,
some references added. This version matches the published one | Universe 2020, 6(10), 166 | 10.3390/universe6100166 | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of fundamental physical constants using the threefold
classification of dimensional constants proposed by J.-M. L{\'e}vy-Leblond:
constants of objects (masses, etc.), constants of phenomena (coupling
constants), and "universal constants" (such as $c$ and $\hbar$). We show that
all of the known... | [
{
"created": "Sun, 17 May 2020 08:57:35 GMT",
"version": "v1"
},
{
"created": "Sun, 31 May 2020 11:16:54 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Oct 2020 15:41:59 GMT",
"version": "v3"
}
] | 2020-10-02 | [
[
"Sheykin",
"A. A.",
""
],
[
"Manida",
"S. N.",
""
]
] | We study the properties of fundamental physical constants using the threefold classification of dimensional constants proposed by J.-M. L{\'e}vy-Leblond: constants of objects (masses, etc.), constants of phenomena (coupling constants), and "universal constants" (such as $c$ and $\hbar$). We show that all of the known "... |
gr-qc/0102026 | Luis Herrera | L. Herrera and D.Pavon | Why hyperbolic theories of dissipation cannot be ignored: Comments on a
paper by Kostadt and Liu | 8 pages Latex, to appear in Phys.Rev.D | Phys.Rev. D64 (2001) 088503 | 10.1103/PhysRevD.64.088503 | null | gr-qc astro-ph cond-mat | null | Contrary to what is asserted in a recent paper by Kostadt and Liu ("Causality
and stability of the relativistic diffusion equation"), experiments can tell
apart (and in fact do) hyperbolic theories from parabolic theories of
dissipation. It is stressed that the existence of a non--negligible relaxation
time does not ... | [
{
"created": "Wed, 7 Feb 2001 16:14:30 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Herrera",
"L.",
""
],
[
"Pavon",
"D.",
""
]
] | Contrary to what is asserted in a recent paper by Kostadt and Liu ("Causality and stability of the relativistic diffusion equation"), experiments can tell apart (and in fact do) hyperbolic theories from parabolic theories of dissipation. It is stressed that the existence of a non--negligible relaxation time does not im... |
gr-qc/0508097 | Jeffrey Winicour | Jeffrey Winicour | Characteristic Evolution and Matching | Published version http://www.livingreviews.org/lrr-2005-10 | Living Rev. Relativity 8, (2005), 10 | 10.12942/lrr-2005-10 | null | gr-qc | null | I review the development of numerical evolution codes for general relativity
based upon the characteristic initial value problem. Progress is traced from
the early stage of 1D feasibility studies to 2D axisymmetric codes that
accurately simulate the oscillations and gravitational collapse of relativistic
stars and to... | [
{
"created": "Tue, 23 Aug 2005 20:17:13 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2005 10:12:28 GMT",
"version": "v2"
}
] | 2016-11-23 | [
[
"Winicour",
"Jeffrey",
""
]
] | I review the development of numerical evolution codes for general relativity based upon the characteristic initial value problem. Progress is traced from the early stage of 1D feasibility studies to 2D axisymmetric codes that accurately simulate the oscillations and gravitational collapse of relativistic stars and to c... |
gr-qc/9704084 | null | Ichiro Oda | Quantum Gravity near Apparent Horizon and Two Dimensional Dilaton
Gravity | 17 pages, phyzzx | Phys.Rev. D57 (1998) 2415-2420 | 10.1103/PhysRevD.57.2415 | EDO-EP-12 | gr-qc | null | We study the Hawking radiation in two dimensional dilaton black hole by means
of quantum gravity holding near the apparent horizon. First of all, we
construct the canonical formalism of the dilaton gravity in two dimensions.
Then the Vaidya metric corresponding to the dilaton black hole is established
where it is sho... | [
{
"created": "Wed, 30 Apr 1997 05:45:53 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Oda",
"Ichiro",
""
]
] | We study the Hawking radiation in two dimensional dilaton black hole by means of quantum gravity holding near the apparent horizon. First of all, we construct the canonical formalism of the dilaton gravity in two dimensions. Then the Vaidya metric corresponding to the dilaton black hole is established where it is shown... |
1805.01487 | Tiziano Abdelsalhin | Tiziano Abdelsalhin, Leonardo Gualtieri, Paolo Pani | Post-Newtonian spin-tidal couplings for compact binaries | a few typos corrected, matches version published in PRD | Phys. Rev. D 98, 104046 (2018) | 10.1103/PhysRevD.98.104046 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the spin-tidal couplings that affect the dynamics of two orbiting
bodies at the leading order in the post-Newtonian (PN) framework and to linear
order in the spin. These corrections belong to two classes: (i) terms arising
from the coupling between the ordinary tidal terms and the point-particle
terms, whi... | [
{
"created": "Thu, 3 May 2018 18:03:19 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2018 20:01:54 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Dec 2018 09:57:00 GMT",
"version": "v3"
}
] | 2018-12-05 | [
[
"Abdelsalhin",
"Tiziano",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Pani",
"Paolo",
""
]
] | We compute the spin-tidal couplings that affect the dynamics of two orbiting bodies at the leading order in the post-Newtonian (PN) framework and to linear order in the spin. These corrections belong to two classes: (i) terms arising from the coupling between the ordinary tidal terms and the point-particle terms, which... |
1212.5553 | Bernard Kelly | Bernard J. Kelly and John G. Baker | Decoding mode-mixing in black-hole merger ringdown | 15 pages, 10 figures, 2 tables; new version has improved Figs. 1-3,
consistent labelling of simulations between Tables I & II,
additional/corrected references, and extra hyphens | Phys. Rev. D 87:084004 (2013) | 10.1103/PhysRevD.87.084004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Optimal extraction of information from gravitational-wave observations of
binary black-hole coalescences requires detailed knowledge of the waveforms.
Current approaches for representing waveform information are based on
spin-weighted spherical harmonic decomposition. Higher-order harmonic modes
carrying a few percen... | [
{
"created": "Fri, 21 Dec 2012 18:48:21 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2013 17:15:01 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Kelly",
"Bernard J.",
""
],
[
"Baker",
"John G.",
""
]
] | Optimal extraction of information from gravitational-wave observations of binary black-hole coalescences requires detailed knowledge of the waveforms. Current approaches for representing waveform information are based on spin-weighted spherical harmonic decomposition. Higher-order harmonic modes carrying a few percent ... |
gr-qc/9907044 | Shahar Hod | Shahar Hod | High-Order Contamination in the Tail of Gravitational Collapse | 12 pages, 2 figures | Phys.Rev.D60:104053,1999 | 10.1103/PhysRevD.60.104053 | null | gr-qc | null | It is well known that the late-time behaviour of gravitational collapse is
{\it dominated} by an inverse power-law decaying tail. We calculate {\it
higher-order corrections} to this power-law behaviour in a spherically
symmetric gravitational collapse. The dominant ``contamination'' is shown to
die off at late times ... | [
{
"created": "Mon, 12 Jul 1999 15:00:46 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jul 1999 06:50:10 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Hod",
"Shahar",
""
]
] | It is well known that the late-time behaviour of gravitational collapse is {\it dominated} by an inverse power-law decaying tail. We calculate {\it higher-order corrections} to this power-law behaviour in a spherically symmetric gravitational collapse. The dominant ``contamination'' is shown to die off at late times as... |
1703.09498 | Mairi Sakellariadou | Mairi Sakellariadou (King's College London) | Quantum Gravity and Cosmology: an intimate interplay | 16 pages, invited talk at DICE2016 (Castiglioncello, Italy, Sept
12-16); to appear in the proceedings | IOP Conf. Series: Journal of Physics: Conf. Series 880 (2017)
012003 | 10.1088/1742-6596/880/1/012003 | KCL-PH-TH/2017-12 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I will briefly discuss three cosmological models built upon three distinct
quantum gravity proposals. I will first highlight the cosmological role of a
vector field in the framework of a string/brane cosmological model. I will then
present the resolution of the big bang singularity and the occurrence of an
early era ... | [
{
"created": "Tue, 28 Mar 2017 10:33:12 GMT",
"version": "v1"
}
] | 2017-09-06 | [
[
"Sakellariadou",
"Mairi",
"",
"King's College London"
]
] | I will briefly discuss three cosmological models built upon three distinct quantum gravity proposals. I will first highlight the cosmological role of a vector field in the framework of a string/brane cosmological model. I will then present the resolution of the big bang singularity and the occurrence of an early era of... |
2407.18652 | Jo\~ao Marto | K. Sravan Kumar and Jo\~ao Marto | Hawking radiation with pure states | 17 pages, 2 figures, work presented at the Spanish and Portuguese
Relativity Meeting - EREP 2023 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Hawking's seminal work on black hole radiation highlights a critical issue in
our understanding of quantum field theory in curved spacetime (QFTCS),
specifically the problem of unitarity loss (where pure states evolve into mixed
states). In this paper, we examine a recent proposal for a direct-sum QFTCS,
which mainta... | [
{
"created": "Fri, 26 Jul 2024 10:38:21 GMT",
"version": "v1"
}
] | 2024-07-29 | [
[
"Kumar",
"K. Sravan",
""
],
[
"Marto",
"João",
""
]
] | Hawking's seminal work on black hole radiation highlights a critical issue in our understanding of quantum field theory in curved spacetime (QFTCS), specifically the problem of unitarity loss (where pure states evolve into mixed states). In this paper, we examine a recent proposal for a direct-sum QFTCS, which maintain... |
gr-qc/0005110 | Douglas Singleton | Doug Singleton | Asymptotic freedom of general relativity and its possible consequences | 8 pages, 0 figures. A contribution to the volume ``Photon: Old
Problems in Light of New Ideas" (Nova Science Publishers, Commack, NY)Ed. V.
Dvoeglazov | null | null | null | gr-qc | null | The formation of singularities in certain situations, such as the collapse of
massive stars, is one of the unresolved issues in classical general relativity.
Although no complete theory of quantum gravity exists it is often suggested
that quantum gravity effects may prevent the formation of these singularities.
In th... | [
{
"created": "Wed, 24 May 2000 20:13:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Singleton",
"Doug",
""
]
] | The formation of singularities in certain situations, such as the collapse of massive stars, is one of the unresolved issues in classical general relativity. Although no complete theory of quantum gravity exists it is often suggested that quantum gravity effects may prevent the formation of these singularities. In this... |
gr-qc/9810028 | Francisco Guzman | F. Siddhartha Guzman and Tonatiuh Matos | Scalar Fields as Dark Matter in Spiral Galaxies | 5 pages, RevTeX, eight eps figures. To appear in Classical and
Quantum Gravity | Class.Quant.Grav.17:L9-L16,2000 | 10.1088/0264-9381/17/1/102 | CINVESTAV-98-22 | gr-qc astro-ph | null | We present a model for the dark matter in spiral galaxies, which is a result
of a static and axial symmetric exact solution of the Einstein-Dilaton theory.
We suposse that dark matter is a scalar field endowed with a scalar potential.
We obtain that a) the effective energy density goes like $1/(r^2+r_{c}^{2})$
and b)... | [
{
"created": "Thu, 8 Oct 1998 03:17:47 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Nov 1998 01:04:18 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Dec 1998 19:17:20 GMT",
"version": "v3"
},
{
"created": "Sun, 7 Nov 1999 08:39:48 GMT",
"version": "v4"
}
] | 2010-04-06 | [
[
"Guzman",
"F. Siddhartha",
""
],
[
"Matos",
"Tonatiuh",
""
]
] | We present a model for the dark matter in spiral galaxies, which is a result of a static and axial symmetric exact solution of the Einstein-Dilaton theory. We suposse that dark matter is a scalar field endowed with a scalar potential. We obtain that a) the effective energy density goes like $1/(r^2+r_{c}^{2})$ and b) t... |
2302.00046 | Maxime Van de Moortel | Warren Li, Maxime Van de Moortel | Kasner inversions and fluctuating collapse inside hairy black holes with
charged matter | 100 pages, 8 figures | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the interior of black holes in the presence of charged scalar hair
of small amplitude $\epsilon$ on the event horizon and show their terminal
boundary is a crushing Kasner-like singularity. These spacetimes are
spherically symmetric, spatially homogeneous and they differ significantly from
the hairy black ho... | [
{
"created": "Tue, 31 Jan 2023 19:27:44 GMT",
"version": "v1"
}
] | 2023-02-02 | [
[
"Li",
"Warren",
""
],
[
"Van de Moortel",
"Maxime",
""
]
] | We study the interior of black holes in the presence of charged scalar hair of small amplitude $\epsilon$ on the event horizon and show their terminal boundary is a crushing Kasner-like singularity. These spacetimes are spherically symmetric, spatially homogeneous and they differ significantly from the hairy black hole... |
gr-qc/0402106 | Gregory J. Galloway | Piotr T. Chrusciel and Gregory J. Galloway | A poor man's positive energy theorem | 8 pages, latex2e | Class.Quant.Grav. 21 (2004) L59-L63 | 10.1088/0264-9381/21/9/L01 | null | gr-qc | null | We show that positivity of energy for stationary, asymptotically flat,
non-singular domains of outer communications is a simple corollary of the
Lorentzian splitting theorem.
| [
{
"created": "Tue, 24 Feb 2004 17:45:48 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chrusciel",
"Piotr T.",
""
],
[
"Galloway",
"Gregory J.",
""
]
] | We show that positivity of energy for stationary, asymptotically flat, non-singular domains of outer communications is a simple corollary of the Lorentzian splitting theorem. |
gr-qc/0108064 | Pantelis S. Apostolopoulos | Pantelis S. Apostolopoulos and Michael Tsamparlis | Comment on Ricci Collineations for spherically symmetric space-times | 3 pages. Accepted for publication in General Relativity and
Gravitation | Gen.Rel.Grav. 34 (2002) 49-52 | 10.1023/A:1015214404912 | null | gr-qc | null | It is shown that the results of the paper by Contreras et al. [Contreras, G.,
Nunez, L. A., Percoco, U. "Ricci Collineations for Non-degenerate, Diagonal and
Spherically Symmetric Ricci Tensors" (2000) Gen. Rel. Grav. 32, 285-294]
concerning the Ricci Collineations in spherically symmetric space-times with
non-degene... | [
{
"created": "Sat, 25 Aug 2001 15:00:03 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Apostolopoulos",
"Pantelis S.",
""
],
[
"Tsamparlis",
"Michael",
""
]
] | It is shown that the results of the paper by Contreras et al. [Contreras, G., Nunez, L. A., Percoco, U. "Ricci Collineations for Non-degenerate, Diagonal and Spherically Symmetric Ricci Tensors" (2000) Gen. Rel. Grav. 32, 285-294] concerning the Ricci Collineations in spherically symmetric space-times with non-degenera... |
2404.05301 | Christian Boehmer | Christian G. Boehmer, Antonio d'Alfonso del Sordo | Cosmological fluids with boundary term couplings | 27 pages, 10 figures, 5 tables | General Relativity and Gravitation 56, 75 (2024) | 10.1007/s10714-024-03260-6 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological models can be studied effectively using dynamical systems
techniques. Starting from Brown's formulation of the variational principle for
relativistic fluids, we introduce new types of couplings involving a perfect
fluid, a scalar field, and boundary terms. We describe three different coupling
models, one... | [
{
"created": "Mon, 8 Apr 2024 08:44:09 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Boehmer",
"Christian G.",
""
],
[
"del Sordo",
"Antonio d'Alfonso",
""
]
] | Cosmological models can be studied effectively using dynamical systems techniques. Starting from Brown's formulation of the variational principle for relativistic fluids, we introduce new types of couplings involving a perfect fluid, a scalar field, and boundary terms. We describe three different coupling models, one o... |
gr-qc/0404101 | Eanna E. Flanagan | \'Etienne Racine and \'Eanna \'E. Flanagan | Post-1-Newtonian equations of motion for systems of arbitrarily
structured bodies | Erratum added | Phys.Rev. D71 (2005) 044010 | 10.1103/PhysRevD.71.044010 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a surface integral derivation of post-1-Newtonian translational
equations of motion for a system of arbitrarily structured bodies, including
the coupling to all the bodies' mass and current multipole moments. The
derivation requires only that the post-1-Newtonian vacuum field equations are
satisfied in weak-f... | [
{
"created": "Mon, 26 Apr 2004 15:36:29 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2005 17:47:37 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Oct 2013 14:11:27 GMT",
"version": "v3"
}
] | 2013-10-07 | [
[
"Racine",
"Étienne",
""
],
[
"Flanagan",
"Éanna É.",
""
]
] | We give a surface integral derivation of post-1-Newtonian translational equations of motion for a system of arbitrarily structured bodies, including the coupling to all the bodies' mass and current multipole moments. The derivation requires only that the post-1-Newtonian vacuum field equations are satisfied in weak-fie... |
2107.11829 | Xisco Jim\'enez Forteza | Xisco Jim\'enez Forteza, Pierre Mourier | High-overtone fits to numerical relativity ringdowns: beyond the
dismissed n=8 special tone | Version consistent with the PRD publication | Physical Review D 104, 124072 (2021) | 10.1103/PhysRevD.104.124072 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In general relativity, the remnant object originating from an uncharged black
hole merger is a Kerr black hole. The approach to this final state is reached
through the emission of a late train of radiation known as the black hole
ringdown. The ringdown morphology is described by a countably infinite set of
damped sin... | [
{
"created": "Sun, 25 Jul 2021 15:33:22 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jan 2022 10:12:15 GMT",
"version": "v2"
}
] | 2022-01-10 | [
[
"Forteza",
"Xisco Jiménez",
""
],
[
"Mourier",
"Pierre",
""
]
] | In general relativity, the remnant object originating from an uncharged black hole merger is a Kerr black hole. The approach to this final state is reached through the emission of a late train of radiation known as the black hole ringdown. The ringdown morphology is described by a countably infinite set of damped sinus... |
2112.10770 | Robert Nesbet | R. K. Nesbet | Implications of the conformal Higgs model | 6pages Published online MDPI Particles Vol 5, p 12 (2022) | MDPI Particles 5, 12 (2022) | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The postulate of universal local Weyl scaling (conformal) symmetry modifies
both general relativity and the Higgs scalar field model. The conformal Higgs
model (CHM) acquires a cosmological effect that fits observed accelerating
Hubble expansion for redshifts $z\leq 1$ (7.33 Gyr) accurately with only one
free constan... | [
{
"created": "Mon, 20 Dec 2021 00:17:40 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jan 2022 23:53:07 GMT",
"version": "v2"
}
] | 2022-02-02 | [
[
"Nesbet",
"R. K.",
""
]
] | The postulate of universal local Weyl scaling (conformal) symmetry modifies both general relativity and the Higgs scalar field model. The conformal Higgs model (CHM) acquires a cosmological effect that fits observed accelerating Hubble expansion for redshifts $z\leq 1$ (7.33 Gyr) accurately with only one free constant ... |
gr-qc/9412068 | Joan Masso | Joseph Libson, Joan Masso, Edward Seidel, Wai-Mo Suen, Paul Walker | Event Horizons in Numerical Relativity I: Methods and Tests | 22 pages, LaTeX with RevTeX 3.0 macros, 20 uuencoded gz-compressed
postscript figures. Also available at http://jean-luc.ncsa.uiuc.edu/Papers/
Submitted to Physical Review D | Phys.Rev. D53 (1996) 4335-4350 | 10.1103/PhysRevD.53.4335 | null | gr-qc | null | This is the first paper in a series on event horizons in numerical
relativity. In this paper we present methods for obtaining the location of an
event horizon in a numerically generated spacetime. The location of an event
horizon is determined based on two key ideas: (1) integrating backward in time,
and (2) integrat... | [
{
"created": "Thu, 22 Dec 1994 16:33:58 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Libson",
"Joseph",
""
],
[
"Masso",
"Joan",
""
],
[
"Seidel",
"Edward",
""
],
[
"Suen",
"Wai-Mo",
""
],
[
"Walker",
"Paul",
""
]
] | This is the first paper in a series on event horizons in numerical relativity. In this paper we present methods for obtaining the location of an event horizon in a numerically generated spacetime. The location of an event horizon is determined based on two key ideas: (1) integrating backward in time, and (2) integratin... |
gr-qc/0102049 | Thomas Buchert | Thomas Buchert (Univ. of Geneva) | On average properties of inhomogeneous fluids in general relativity II:
perfect fluid cosmologies | TeX 21 pages, matches published version: G.R.G., in press | Gen.Rel.Grav.33:1381-1405,2001 | 10.1023/A:1012061725841 | null | gr-qc astro-ph | null | For general relativistic spacetimes filled with an irrotational perfect fluid
a generalized form of Friedmann's equations governing the expansion factor of
spatially averaged portions of inhomogeneous cosmologies is derived. The
averaging problem for scalar quantities is condensed into the problem of
finding an `effe... | [
{
"created": "Mon, 12 Feb 2001 17:25:16 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2001 11:56:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Buchert",
"Thomas",
"",
"Univ. of Geneva"
]
] | For general relativistic spacetimes filled with an irrotational perfect fluid a generalized form of Friedmann's equations governing the expansion factor of spatially averaged portions of inhomogeneous cosmologies is derived. The averaging problem for scalar quantities is condensed into the problem of finding an `effect... |
1806.09983 | Darrell Jackson | Darrell Jackson | Re-Examination of Simple Kaluza-Klein Cosmologies | Previously unpublished | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simple cosmological models based upon five-dimensional Kaluza-Klein
relativity are re-examined and interesting properties are indicated. These
models are special cases of those obtained by Davidson et al. and Mann and
Vincent, specifically, those with vanishing cosmological constant. No
five-dimensional sources are p... | [
{
"created": "Sat, 23 Jun 2018 21:46:10 GMT",
"version": "v1"
}
] | 2018-06-27 | [
[
"Jackson",
"Darrell",
""
]
] | Simple cosmological models based upon five-dimensional Kaluza-Klein relativity are re-examined and interesting properties are indicated. These models are special cases of those obtained by Davidson et al. and Mann and Vincent, specifically, those with vanishing cosmological constant. No five-dimensional sources are pre... |
1609.09289 | Salvatore Capozziello | Salvatore Capozziello, Mariafelicia De Laurentis, Konstantinos F.
Dialektopoulos | Noether Symmetries in Gauss-Bonnet-teleparallel cosmology | 6 pages | null | 10.1140/epjc/s10052-016-4491-0 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generalized teleparallel cosmological model, $f(T_\mathcal{G},T)$,
containing the torsion scalar $T$ and the teleparallel counterpart of the
Gauss-Bonnet topological invariant $T_{\mathcal{G}}$, is studied in the
framework of the Noether Symmetry Approach. As $f(\mathcal{G}, R)$ gravity,
where $\mathcal{G}$ is the ... | [
{
"created": "Thu, 29 Sep 2016 10:28:12 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Dialektopoulos",
"Konstantinos F.",
""
]
] | A generalized teleparallel cosmological model, $f(T_\mathcal{G},T)$, containing the torsion scalar $T$ and the teleparallel counterpart of the Gauss-Bonnet topological invariant $T_{\mathcal{G}}$, is studied in the framework of the Noether Symmetry Approach. As $f(\mathcal{G}, R)$ gravity, where $\mathcal{G}$ is the Ga... |
gr-qc/0512025 | Chopin Soo | Chopin Soo | Further simplification of the constraints of four-dimensional gravity | 3 pages, LaTeX file. Original article replaced by brief conference
report. Published in Proc. 7th. Asia-Pacific Int. Conf. on Gravitation and
Astrophysics (ICGA7) (Nat. Central U., Taiwan, Nov. 2005) p. 278-283 eds. J.
M. Nester, C-M Chen and J-P Hsu (World Scientific, 2007) | null | null | null | gr-qc | null | The super-Hamiltonian of 4-dimensional gravity as simplified by Ashtekar
through the use of gauge potential and densitized triad variables can
furthermore be succinctly expressed as a Poisson bracket between the volume
element and other fundamental gauge-invariant elements of 3-geometry. This
observation naturally su... | [
{
"created": "Mon, 5 Dec 2005 10:52:21 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2007 11:46:30 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Soo",
"Chopin",
""
]
] | The super-Hamiltonian of 4-dimensional gravity as simplified by Ashtekar through the use of gauge potential and densitized triad variables can furthermore be succinctly expressed as a Poisson bracket between the volume element and other fundamental gauge-invariant elements of 3-geometry. This observation naturally sugg... |
gr-qc/0411113 | Slava G. Turyshev | James G. Williams, Slava G. Turyshev, and Dale H. Boggs | Progress in Lunar Laser Ranging Tests of Relativistic Gravity | 4 pages, revtex4, minor changes made for publication | Phys.Rev.Lett.93:261101,2004 | 10.1103/PhysRevLett.93.261101 | null | gr-qc | null | Analyses of laser ranges to the Moon provide increasingly stringent limits on
any violation of the Equivalence Principle (EP); they also enable several very
accurate tests of relativistic gravity. We report the results of our recent
analysis of Lunar Laser Ranging (LLR) data giving an EP test of \Delta
(M_G/M_I)_{EP}... | [
{
"created": "Wed, 24 Nov 2004 02:18:51 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Dec 2004 18:32:48 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Williams",
"James G.",
""
],
[
"Turyshev",
"Slava G.",
""
],
[
"Boggs",
"Dale H.",
""
]
] | Analyses of laser ranges to the Moon provide increasingly stringent limits on any violation of the Equivalence Principle (EP); they also enable several very accurate tests of relativistic gravity. We report the results of our recent analysis of Lunar Laser Ranging (LLR) data giving an EP test of \Delta (M_G/M_I)_{EP} =... |
1211.6939 | Frederico Francisco | Orfeu Bertolami, Frederico Francisco, Jorge P\'aramos, Paulo J. S. Gil | The Contribution of Thermal Effects to the Acceleration of the
Deep-Space Pioneer Spacecraft | 17 pages, 5 figures. To appear in the Proceedings of the "1st IAA
Conference on Dynamics and Control of Space Systems", 19-21 March 2012,
Porto, Portugal | null | null | null | gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method for the computation of the radiative momentum transfer in the
Pioneer 10 & 11 spacecraft due to the diffusive and specular components of
reflection is presented. The method provides a reliable estimate of the thermal
contribution to the acceleration of these deep space probes and allows for a
Monte-Carlo ana... | [
{
"created": "Thu, 29 Nov 2012 15:03:57 GMT",
"version": "v1"
}
] | 2012-11-30 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Francisco",
"Frederico",
""
],
[
"Páramos",
"Jorge",
""
],
[
"Gil",
"Paulo J. S.",
""
]
] | A method for the computation of the radiative momentum transfer in the Pioneer 10 & 11 spacecraft due to the diffusive and specular components of reflection is presented. The method provides a reliable estimate of the thermal contribution to the acceleration of these deep space probes and allows for a Monte-Carlo analy... |
1707.03059 | Kristina Giesel | Kristina Giesel | The kinematical Setup of Quantum Geometry: A Brief Review | 46 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we present a brief introduction to the kinematical setup that
underlies the quantization used in loop quantum gravity. This review has been
published as a chapter in the monograph "Loop Quantum Gravity: The First 30
Years", edited by Abhay Ashtekar and Jorge Pullin, that was recently published
in the ... | [
{
"created": "Mon, 10 Jul 2017 20:49:48 GMT",
"version": "v1"
}
] | 2017-07-12 | [
[
"Giesel",
"Kristina",
""
]
] | In this article we present a brief introduction to the kinematical setup that underlies the quantization used in loop quantum gravity. This review has been published as a chapter in the monograph "Loop Quantum Gravity: The First 30 Years", edited by Abhay Ashtekar and Jorge Pullin, that was recently published in the se... |
2204.08077 | Andrea Geralico | Donato Bini, Andrea Geralico | Multipolar invariants and the eccentricity enhancement function
parametrization of gravitational radiation | 25 pages, revtex macros used | null | 10.1103/PhysRevD.105.124001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational radiation can be decomposed as an infinite sum of radiative
multipole moments, which parametrize the waveform at infinity. The
multipolar-post-Minkowskian formalism provides a connection between these
multipoles and the source multipole moments, known as explicit integrals over
the matter source. The gr... | [
{
"created": "Sun, 17 Apr 2022 20:09:49 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | Gravitational radiation can be decomposed as an infinite sum of radiative multipole moments, which parametrize the waveform at infinity. The multipolar-post-Minkowskian formalism provides a connection between these multipoles and the source multipole moments, known as explicit integrals over the matter source. The grav... |
1508.05377 | Dmitriy I. Podolskiy | Dmitriy Podolskiy, Robert Lanza | On decoherence in quantum gravity | 28 pages, 3 figures; matches version published in Annalen der Physik | Annalen der Physik, 528, 9-10, 663-676 (2016) | 10.1002/andp.201600011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was previously argued that the phenomenon of quantum gravitational
decoherence described by the Wheeler-DeWitt equation is responsible for the
emergence of the arrow of time. Here we show that the characteristic
spatio-temporal scales of quantum gravitational decoherence are typically
logarithmically larger than a... | [
{
"created": "Fri, 21 Aug 2015 19:35:50 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Feb 2017 16:59:27 GMT",
"version": "v2"
}
] | 2017-02-28 | [
[
"Podolskiy",
"Dmitriy",
""
],
[
"Lanza",
"Robert",
""
]
] | It was previously argued that the phenomenon of quantum gravitational decoherence described by the Wheeler-DeWitt equation is responsible for the emergence of the arrow of time. Here we show that the characteristic spatio-temporal scales of quantum gravitational decoherence are typically logarithmically larger than a c... |
0910.4930 | Kirill Bronnikov | K.A. Bronnikov, E.V. Donskoy | Possible black universes in a brane world | 8 pages, 5 figures, gc style | Grav.Cosmol.16:42-49,2010 | 10.1134/S0202289310010068 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A black universe is a nonsingular black hole where, beyond the horizon, there
is an expanding, asymptotically isotropic universe. Such spherically symmetric
configurations have been recently found as solutions to the Einstein equations
with phantom scalar fields (with negative kinetic energy) as sources of
gravity. T... | [
{
"created": "Mon, 26 Oct 2009 17:16:00 GMT",
"version": "v1"
}
] | 2010-03-19 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Donskoy",
"E. V.",
""
]
] | A black universe is a nonsingular black hole where, beyond the horizon, there is an expanding, asymptotically isotropic universe. Such spherically symmetric configurations have been recently found as solutions to the Einstein equations with phantom scalar fields (with negative kinetic energy) as sources of gravity. The... |
2211.08052 | Liam Urban | David Fajman and Liam Urban | Cosmic Censorship near FLRW spacetimes with negative spatial curvature | 93 pages. Expanded introduction; improvements and simplifications to
the bootstrap argument for Big Bang stability; otherwise minor corrections
and tightened exposition | null | null | null | gr-qc math-ph math.AP math.MP | http://creativecommons.org/licenses/by/4.0/ | We consider general initial data for the Einstein scalar-field system on a
closed $3$-manifold $(M,\gamma)$ which is close to data for a
Friedman-Lema\^itre-Robertson-Walker solution with homogeneous scalar field
matter and a negative Einstein metric $\gamma$ as spatial geometry. We prove
that the maximal globally hy... | [
{
"created": "Tue, 15 Nov 2022 11:06:02 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2023 13:20:33 GMT",
"version": "v2"
}
] | 2023-07-20 | [
[
"Fajman",
"David",
""
],
[
"Urban",
"Liam",
""
]
] | We consider general initial data for the Einstein scalar-field system on a closed $3$-manifold $(M,\gamma)$ which is close to data for a Friedman-Lema\^itre-Robertson-Walker solution with homogeneous scalar field matter and a negative Einstein metric $\gamma$ as spatial geometry. We prove that the maximal globally hype... |
2002.09863 | Salvador Robles-Perez | S. J. Robles-Perez | Quantum creation of a universe-antiuniverse pair | 7 pages, 3 figures, prepared for the proceedings of the POTOR-6
Conference of the Polish Society on Relativity, held in Szczecin (Poland)
from 23-26th of Sept. 2019 | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If one analyses the quantum creation of the universe, it turns out that the
most natural way in which the universes can be created is in pairs of universes
whose time flow is reversely related. It means that the matter that propagates
in one of the universes can be seen, from the point of view of the other
universe, ... | [
{
"created": "Sun, 23 Feb 2020 09:02:18 GMT",
"version": "v1"
}
] | 2020-02-25 | [
[
"Robles-Perez",
"S. J.",
""
]
] | If one analyses the quantum creation of the universe, it turns out that the most natural way in which the universes can be created is in pairs of universes whose time flow is reversely related. It means that the matter that propagates in one of the universes can be seen, from the point of view of the other universe, as... |
gr-qc/9708028 | BS Kay | Claes R Cramer (York) and Bernard S. Kay (York) | The thermal and two-particle stress-energy must be ill-defined on the
2-d Misner space chronology horizon | 6 pages, LaTeX, RevTeX, no figures | Phys.Rev. D57 (1998) 1052-1056 | 10.1103/PhysRevD.57.1052 | null | gr-qc | null | We show that an analogue of the (four dimensional) image sum method can be
used to reproduce the results, due to Krasnikov, that for the model of a real
massless scalar field on the initial globally hyperbolic region IGH of
two-dimensional Misner space there exist two-particle and thermal Hadamard
states (built on th... | [
{
"created": "Thu, 14 Aug 1997 17:34:54 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Cramer",
"Claes R",
"",
"York"
],
[
"Kay",
"Bernard S.",
"",
"York"
]
] | We show that an analogue of the (four dimensional) image sum method can be used to reproduce the results, due to Krasnikov, that for the model of a real massless scalar field on the initial globally hyperbolic region IGH of two-dimensional Misner space there exist two-particle and thermal Hadamard states (built on the ... |
2212.11212 | Kerstin E. Kunze | Kerstin E. Kunze | Penrose limits of inhomogeneous space-times, their diagonalizability and
twistors | 15 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Penrose limits are considered in space-times admitting two abelian,
space-like Killing vectors in vacuum as well as in the presence of an
electromagnetic field. This type of space-times describe inhomogeneous
cosmologies as well as colliding plane gravitational and electromagnetic waves.
Following the work of Tod [1]... | [
{
"created": "Wed, 21 Dec 2022 17:37:19 GMT",
"version": "v1"
}
] | 2022-12-22 | [
[
"Kunze",
"Kerstin E.",
""
]
] | Penrose limits are considered in space-times admitting two abelian, space-like Killing vectors in vacuum as well as in the presence of an electromagnetic field. This type of space-times describe inhomogeneous cosmologies as well as colliding plane gravitational and electromagnetic waves. Following the work of Tod [1] t... |
1003.4020 | Robert van den Hoogen | R.J. van den Hoogen | Averaging Spacetime: Where do we go from here? | 10 pages; To appear in the Proceedings of the 12th Marcel Grossman
Meeting; A new reference added and some small editorial changes made in V2. | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The construction of an averaged theory of gravity based on Einstein's General
Relativity is very difficult due to the non-linear nature of the gravitational
field equations. This problem is further exacerbated by the difficulty in
defining a mathematically precise covariant averaging procedure for tensor
fields over ... | [
{
"created": "Sun, 21 Mar 2010 20:13:12 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Apr 2010 09:29:36 GMT",
"version": "v2"
}
] | 2010-04-16 | [
[
"Hoogen",
"R. J. van den",
""
]
] | The construction of an averaged theory of gravity based on Einstein's General Relativity is very difficult due to the non-linear nature of the gravitational field equations. This problem is further exacerbated by the difficulty in defining a mathematically precise covariant averaging procedure for tensor fields over di... |
2203.12358 | Alexander Ganz | Alexander Ganz | Dynamical Dark Energy in Minimally Modified Gravity | 21 pages; accepted version | null | 10.1088/1475-7516/2022/08/074 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Minimally modified gravity is a class of models with only the two tensor
degrees of freedom as in general relativity. Using the framework with auxiliary
constraints these models can maintain a dynamical cosmological background. The
form of the constraints is thereby restricted by the requirement of dynamical
dark ene... | [
{
"created": "Wed, 23 Mar 2022 12:16:16 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Sep 2022 01:30:03 GMT",
"version": "v2"
}
] | 2022-09-02 | [
[
"Ganz",
"Alexander",
""
]
] | Minimally modified gravity is a class of models with only the two tensor degrees of freedom as in general relativity. Using the framework with auxiliary constraints these models can maintain a dynamical cosmological background. The form of the constraints is thereby restricted by the requirement of dynamical dark energ... |
2006.15060 | Natarajan Shriethar | Natarajan S, Chandrmohan R, Swaminathan R | Conformal cyclic evolution of phantom energy dominated universe | null | Revista Mexicana de F\'isica, 66(2 Mar-Apr), 209-223 (2020) | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | From the Wheeler-Dewitt solutions, the scale factor of the initial universe
is discussed. In this study, scale factors from Wheeler-Dewitt solutions, loop
quantum gravity, and phantom energy dominated stages are compared. Certain
modifications have been attempted in scale factor and quantum potentials driven
by canon... | [
{
"created": "Fri, 26 Jun 2020 15:39:37 GMT",
"version": "v1"
}
] | 2020-06-29 | [
[
"S",
"Natarajan",
""
],
[
"R",
"Chandrmohan",
""
],
[
"R",
"Swaminathan",
""
]
] | From the Wheeler-Dewitt solutions, the scale factor of the initial universe is discussed. In this study, scale factors from Wheeler-Dewitt solutions, loop quantum gravity, and phantom energy dominated stages are compared. Certain modifications have been attempted in scale factor and quantum potentials driven by canonic... |
gr-qc/9303030 | Sean Hayward | Sean A. Hayward | Quasi-Local Gravitational Energy | 16 pages | Phys.Rev. D49 (1994) 831-839 | 10.1103/PhysRevD.49.831 | null | gr-qc | null | A dynamically preferred quasi-local definition of gravitational energy is
given in terms of the Hamiltonian of a `2+2' formulation of general relativity.
The energy is well-defined for any compact orientable spatial 2-surface, and
depends on the fundamental forms only. The energy is zero for any surface in
flat space... | [
{
"created": "Fri, 26 Mar 1993 14:55:19 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Hayward",
"Sean A.",
""
]
] | A dynamically preferred quasi-local definition of gravitational energy is given in terms of the Hamiltonian of a `2+2' formulation of general relativity. The energy is well-defined for any compact orientable spatial 2-surface, and depends on the fundamental forms only. The energy is zero for any surface in flat spaceti... |
1410.5027 | Marcus Khuri | Marcus Khuri, Gilbert Weinstein and Sumio Yamada | Extensions of the Charged Riemannian Penrose Inequality | 11 pages; final version | Class. Quantum Grav., 32 (2015), 035019 | 10.1088/0264-9381/32/3/035019 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the extension of the charged Riemannian Penrose
inequality to the case where charges are present outside the horizon. We prove
a positive result when the charge densities are compactly supported, and
present a counterexample when the charges extend to infinity. We also discuss
additional ... | [
{
"created": "Sun, 19 Oct 2014 02:10:42 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Feb 2015 16:53:09 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Khuri",
"Marcus",
""
],
[
"Weinstein",
"Gilbert",
""
],
[
"Yamada",
"Sumio",
""
]
] | In this paper we investigate the extension of the charged Riemannian Penrose inequality to the case where charges are present outside the horizon. We prove a positive result when the charge densities are compactly supported, and present a counterexample when the charges extend to infinity. We also discuss additional ex... |
1110.4578 | I\~naki Garay | Enrique F. Borja, Jacobo Diaz-Polo, I\~naki Garay | U(N) and holomorphic methods for LQG and Spin Foams | 16 pages. Proceedings for the 3rd Quantum Geometry and Quantum
Gravity School in Zakopane (2011) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The U(N) framework and the spinor representation for loop quantum gravity are
two new points of view that can help us deal with the most fundamental problems
of the theory. Here, we review the detailed construction of the U(N) framework
explaining how one can endow the Hilbert space of N-leg intertwiners with a
Fock ... | [
{
"created": "Thu, 20 Oct 2011 16:43:53 GMT",
"version": "v1"
}
] | 2011-10-21 | [
[
"Borja",
"Enrique F.",
""
],
[
"Diaz-Polo",
"Jacobo",
""
],
[
"Garay",
"Iñaki",
""
]
] | The U(N) framework and the spinor representation for loop quantum gravity are two new points of view that can help us deal with the most fundamental problems of the theory. Here, we review the detailed construction of the U(N) framework explaining how one can endow the Hilbert space of N-leg intertwiners with a Fock st... |
2011.10288 | Matheus do Carmo Teodoro | Matheus C. Teodoro, Lucas G. Collodel, Jutta Kunz | Retrograde Polish Doughnuts around Boson Stars | null | JCAP03(2021)063 | 10.1088/1475-7516/2021/03/063 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate Polish doughnuts with a uniform constant specific angular
momentum distribution in the space-times of rotating boson stars. In such
space-times thick tori can exhibit unique features not present in Kerr
space-times. For instance, in the context of retrograde tori, they may possess
two centers connected... | [
{
"created": "Fri, 20 Nov 2020 09:22:12 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 08:50:42 GMT",
"version": "v2"
}
] | 2021-04-20 | [
[
"Teodoro",
"Matheus C.",
""
],
[
"Collodel",
"Lucas G.",
""
],
[
"Kunz",
"Jutta",
""
]
] | We investigate Polish doughnuts with a uniform constant specific angular momentum distribution in the space-times of rotating boson stars. In such space-times thick tori can exhibit unique features not present in Kerr space-times. For instance, in the context of retrograde tori, they may possess two centers connected o... |
gr-qc/0307103 | Sergiu Vacaru I. | Sergiu I. Vacaru | Exact Solutions with Noncommutative Symmetries in Einstein and Gauge
Gravity | latex2e, 53 pages, the variant to be published in J. Math. Phys | J.Math.Phys.46:042503,2005 | 10.1063/1.1869538 | null | gr-qc hep-th math-ph math.DG math.MP | null | We present new classes of exact solutions with noncommutative symmetries
constructed in vacuum Einstein gravity (in general, with nonzero cosmological
constant), five dimensional (5D) gravity and (anti) de Sitter gauge gravity.
Such solutions are generated by anholonomic frame transforms and parametrized
by generic o... | [
{
"created": "Wed, 23 Jul 2003 18:51:32 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2005 13:40:48 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Vacaru",
"Sergiu I.",
""
]
] | We present new classes of exact solutions with noncommutative symmetries constructed in vacuum Einstein gravity (in general, with nonzero cosmological constant), five dimensional (5D) gravity and (anti) de Sitter gauge gravity. Such solutions are generated by anholonomic frame transforms and parametrized by generic off... |
0911.2525 | Yong-Wan Kim | Yun Soo Myung, Yong-Wan Kim, Woo-Sik Son, Young-Jai Park | Chaotic universe in the z=2 Hovava-Lifshitz gravity | 7 pages, 5 figures, version to appear in PRD | Phys.Rev.D82:043506,2010 | 10.1103/PhysRevD.82.043506 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The deformed z=2 Horava-Lifshitz gravity with coupling constant w leads to a
nonrelativistic "mixmaster" cosmological model. The potential of theory is
given by the sum of IR and UV potentials in the ADM Hamiltonian formalism. It
turns out that adding the UV-potential cannot suppress chaotic behaviors
existing in the... | [
{
"created": "Fri, 13 Nov 2009 02:20:32 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Dec 2009 08:05:36 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Jul 2010 01:01:05 GMT",
"version": "v3"
}
] | 2015-03-13 | [
[
"Myung",
"Yun Soo",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Son",
"Woo-Sik",
""
],
[
"Park",
"Young-Jai",
""
]
] | The deformed z=2 Horava-Lifshitz gravity with coupling constant w leads to a nonrelativistic "mixmaster" cosmological model. The potential of theory is given by the sum of IR and UV potentials in the ADM Hamiltonian formalism. It turns out that adding the UV-potential cannot suppress chaotic behaviors existing in the I... |
1904.01525 | Angelo E. S. Hartmann | A. E. S. Hartmann and M. Novello | A new bifurcation in the Universe | 10 pages, 4 figures | Unravelling Complexity, pp.271-287 (2020) | 10.1142/9789811200076_0013 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We show that the combined system of general relativity with a non minimally
coupled electromagnetic field presents a bifurcation in a cosmical framework
driven by a cosmological constant. In the same framework we show the existence
of states such that the resulting combined energy (the sum of the minimally and
the no... | [
{
"created": "Tue, 2 Apr 2019 16:19:19 GMT",
"version": "v1"
}
] | 2020-06-23 | [
[
"Hartmann",
"A. E. S.",
""
],
[
"Novello",
"M.",
""
]
] | We show that the combined system of general relativity with a non minimally coupled electromagnetic field presents a bifurcation in a cosmical framework driven by a cosmological constant. In the same framework we show the existence of states such that the resulting combined energy (the sum of the minimally and the non ... |
2405.06501 | Shafqat Ul Islam | Amnish Vachher, Shafqat Ul Islam and Sushant G. Ghosh | Testing Strong Gravitational Lensing Effects of Supermassive Black Holes
with String-Inspired Metric, EHT Constraints and Parameter Estimation | 14 Pages, 11 Figures and 6 Tables | null | null | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | We examine and compare the gravitational lensing, in the strong field limit,
for the spherically symmetric string-inspired Euler-Heisenberg black holes,
characterized by additional parameters $Q^2$ and $\alpha-\beta$, representing
magnetic charge and coupling constant, respectively. Our analysis reveals a
reduction i... | [
{
"created": "Fri, 10 May 2024 14:26:46 GMT",
"version": "v1"
}
] | 2024-05-13 | [
[
"Vachher",
"Amnish",
""
],
[
"Islam",
"Shafqat Ul",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | We examine and compare the gravitational lensing, in the strong field limit, for the spherically symmetric string-inspired Euler-Heisenberg black holes, characterized by additional parameters $Q^2$ and $\alpha-\beta$, representing magnetic charge and coupling constant, respectively. Our analysis reveals a reduction in ... |
gr-qc/0309109 | Matt Visser | Matt Visser (Victoria University of Wellington) | Jerk, snap, and the cosmological equation of state | V1: 10 pages; uses iopart.cls setstack.sty V2: six additional
references, some clarifying comments and discussion, no physics changes. V3:
significant additions based on community feedback; explicit calculations now
carried out to fourth order in redshift. V4: Discussion of current
observational situation added... | Class.Quant.Grav.21:2603-2616,2004 | 10.1088/0264-9381/21/11/006 | null | gr-qc astro-ph hep-th | null | Taylor expanding the cosmological equation of state around the current epoch
is the simplest model one can consider that does not make any a priori
restrictions on the nature of the cosmological fluid. Most popular cosmological
models attempt to be ``predictive'', in the sense that once somea priori
equation of state... | [
{
"created": "Tue, 23 Sep 2003 04:08:40 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 2003 22:25:25 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Dec 2003 02:35:32 GMT",
"version": "v3"
},
{
"created": "Wed, 31 Mar 2004 02:48:04 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Taylor expanding the cosmological equation of state around the current epoch is the simplest model one can consider that does not make any a priori restrictions on the nature of the cosmological fluid. Most popular cosmological models attempt to be ``predictive'', in the sense that once somea priori equation of state i... |
1105.0445 | Yaser Tavakoli | Yaser Tavakoli, Jo\~ao Marto, Amir Hadi Ziaie, and Paulo Vargas Moniz | Gravitational collapse with tachyon field and barotropic fluid | 18 pages, 7 figures. v3: minor changes. Final version to appear in
GRG | null | 10.1007/s10714-013-1503-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A particular class of space-time, with a tachyon field, \phi, and a
barotropic fluid constituting the matter content, is considered herein as a
model for gravitational collapse. For simplicity, the tachyon potential is
assumed to be of inverse square form i.e., V(\phi) \sim \phi^{-2}. Our purpose,
by making use of th... | [
{
"created": "Mon, 2 May 2011 21:56:59 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jun 2012 22:31:51 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jan 2013 22:40:43 GMT",
"version": "v3"
}
] | 2013-01-23 | [
[
"Tavakoli",
"Yaser",
""
],
[
"Marto",
"João",
""
],
[
"Ziaie",
"Amir Hadi",
""
],
[
"Moniz",
"Paulo Vargas",
""
]
] | A particular class of space-time, with a tachyon field, \phi, and a barotropic fluid constituting the matter content, is considered herein as a model for gravitational collapse. For simplicity, the tachyon potential is assumed to be of inverse square form i.e., V(\phi) \sim \phi^{-2}. Our purpose, by making use of the ... |
0711.4423 | Yi-Fu Cai | Yi-Fu Cai, Yi Wang | Hawking-Moss Tunneling in Noncommutative Eternal Inflation | 12 pages, 1 figure, accepted by JCAP | JCAP0801:001,2008 | 10.1088/1475-7516/2008/01/001 | null | gr-qc astro-ph hep-ph hep-th | null | The quantum behavior of noncommutative eternal inflation is quite different
from the usual knowledge. Unlike the usual eternal inflation, the quantum
fluctuation of noncommutative eternal inflation is suppressed by the Hubble
parameter. Due to this, we need to reconsider many conceptions of eternal
inflation. In this... | [
{
"created": "Wed, 28 Nov 2007 05:44:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cai",
"Yi-Fu",
""
],
[
"Wang",
"Yi",
""
]
] | The quantum behavior of noncommutative eternal inflation is quite different from the usual knowledge. Unlike the usual eternal inflation, the quantum fluctuation of noncommutative eternal inflation is suppressed by the Hubble parameter. Due to this, we need to reconsider many conceptions of eternal inflation. In this p... |
1608.01679 | Jo\~ao Morais | Jo\~ao Morais, Mariam Bouhmadi-L\'opez, K. Sravan Kumar, Jo\~ao Marto,
Yaser Tavakoli | Interacting 3-form dark energy models: distinguishing interactions and
avoiding the Little Sibling of the Big Rip | 38 pages, 10 figures, 4 tables. Small typos corrected, references
added. Paper accepted in Physics of the Dark Universe | null | 10.1016/j.dark.2016.11.002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider 3-form dark energy (DE) models with interactions in
the dark sector. We aim to distinguish the phenomenological interactions that
are defined through the dark matter (DM) and the DE energy densities. We do our
analysis mainly in two stages. In the first stage, we identify the
non-interacting... | [
{
"created": "Thu, 4 Aug 2016 20:00:08 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2016 13:32:21 GMT",
"version": "v2"
}
] | 2016-11-18 | [
[
"Morais",
"João",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Kumar",
"K. Sravan",
""
],
[
"Marto",
"João",
""
],
[
"Tavakoli",
"Yaser",
""
]
] | In this paper we consider 3-form dark energy (DE) models with interactions in the dark sector. We aim to distinguish the phenomenological interactions that are defined through the dark matter (DM) and the DE energy densities. We do our analysis mainly in two stages. In the first stage, we identify the non-interacting 3... |
gr-qc/9812081 | Amir H. Abbassi | Amir H. Abbassi | General Solutions of The Spherically Symmetric Vacuum Einstein Field
Equations | 8 pages,no figure, latex Adding a section | null | null | Thp-Gr/001 | gr-qc | null | According to Birkhoff's theorem the only spherically symmetric solution of
the vacuum Einstein field equations is the Schwarzschild solution. Inspite of
imposing asymptotically flatness and staticness as initial conditions we obtain
that these equations have general solutions with the Schwarzschild metric as
merely a... | [
{
"created": "Wed, 23 Dec 1998 03:01:31 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 1999 17:50:43 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Abbassi",
"Amir H.",
""
]
] | According to Birkhoff's theorem the only spherically symmetric solution of the vacuum Einstein field equations is the Schwarzschild solution. Inspite of imposing asymptotically flatness and staticness as initial conditions we obtain that these equations have general solutions with the Schwarzschild metric as merely a s... |
2308.14044 | Maciej Ossowski | Denis Dobkowski-Ry{\l}ko, Jerzy Lewandowski, Maciej Ossowski | Isolated horizons of the Hopf bundle structure transversal to the null
direction, the horizon equations and embeddability in NUT-like spacetimes | 29 pages, typos fixed, version accepted in PRD | null | 10.1103/PhysRevD.108.104057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Isolated horizons that admit the Hopf bundle structure $H\rightarrow S_2$ are
investigated, however the null direction is allowed not to be tangent to the
bundle fibres. The geometry of such horizons is characterised by data set on a
topological two-dimensional sphere, singular at its poles. The horizon
equations ind... | [
{
"created": "Sun, 27 Aug 2023 08:39:41 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Oct 2023 15:12:13 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Nov 2023 13:41:55 GMT",
"version": "v3"
}
] | 2023-12-01 | [
[
"Dobkowski-Ryłko",
"Denis",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Ossowski",
"Maciej",
""
]
] | Isolated horizons that admit the Hopf bundle structure $H\rightarrow S_2$ are investigated, however the null direction is allowed not to be tangent to the bundle fibres. The geometry of such horizons is characterised by data set on a topological two-dimensional sphere, singular at its poles. The horizon equations induc... |
gr-qc/0210019 | Christopher Beetle | Christopher Beetle and Lior M. Burko | A Radiation Scalar for Numerical Relativity | 4 pages, 1 EPS figure | Phys.Rev.Lett. 89 (2002) 271101 | 10.1103/PhysRevLett.89.271101 | null | gr-qc | null | This letter describes a scalar curvature invariant for general relativity
with a certain, distinctive feature. While many such invariants exist, this one
vanishes in regions of space-time which can be said unambiguously to contain no
gravitational radiation. In more general regions which incontrovertibly support
non-... | [
{
"created": "Sat, 5 Oct 2002 19:07:29 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Beetle",
"Christopher",
""
],
[
"Burko",
"Lior M.",
""
]
] | This letter describes a scalar curvature invariant for general relativity with a certain, distinctive feature. While many such invariants exist, this one vanishes in regions of space-time which can be said unambiguously to contain no gravitational radiation. In more general regions which incontrovertibly support non-tr... |
1406.3750 | Alvin Chua | Alvin J. K. Chua, Priscilla Ca\~nizares, Jonathan R. Gair | Electromagnetic signatures of far-field gravitational radiation in the
1+3 approach | Published version | Class. Quantum Grav. 32, 015011 (2015) | 10.1088/0264-9381/32/1/015011 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from astrophysical sources can interact with background
electromagnetic fields, giving rise to distinctive and potentially detectable
electromagnetic signatures. In this paper, we study such interactions for
far-field gravitational radiation using the 1+3 approach to relativity.
Linearised equatio... | [
{
"created": "Sat, 14 Jun 2014 16:07:08 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Dec 2014 11:44:47 GMT",
"version": "v2"
}
] | 2014-12-09 | [
[
"Chua",
"Alvin J. K.",
""
],
[
"Cañizares",
"Priscilla",
""
],
[
"Gair",
"Jonathan R.",
""
]
] | Gravitational waves from astrophysical sources can interact with background electromagnetic fields, giving rise to distinctive and potentially detectable electromagnetic signatures. In this paper, we study such interactions for far-field gravitational radiation using the 1+3 approach to relativity. Linearised equations... |
1512.03819 | Jo\~ao Morais | Alvina Burgazli, Alexander Zhuk, Jo\~ao Morais, Mariam
Bouhmadi-L\'opez and K. Sravan Kumar | Coupled scalar fields in the late Universe: The mechanical approach and
the late cosmic acceleration | 14pages, 1 figure | JCAP09 (2016) 045 | 10.1088/1475-7516/2016/09/045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the Universe at the late stage of its evolution
and deep inside the cell of uniformity. At these scales, we consider the
Universe to be filled with dust-like matter in the form of discretely
distributed galaxies, a minimally coupled scalar field and radiation as matter
sources. We investiga... | [
{
"created": "Fri, 11 Dec 2015 21:00:06 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2016 13:12:06 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Oct 2016 10:55:19 GMT",
"version": "v3"
}
] | 2016-10-05 | [
[
"Burgazli",
"Alvina",
""
],
[
"Zhuk",
"Alexander",
""
],
[
"Morais",
"João",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Kumar",
"K. Sravan",
""
]
] | In this paper, we consider the Universe at the late stage of its evolution and deep inside the cell of uniformity. At these scales, we consider the Universe to be filled with dust-like matter in the form of discretely distributed galaxies, a minimally coupled scalar field and radiation as matter sources. We investigate... |
1503.04145 | Luke Butcher | Luke M. Butcher | Traversable Wormholes and Classical Scalar Fields | 6 pages; published version | Phys. Rev. D 91, 124031 (2015) | 10.1103/PhysRevD.91.124031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I prove that general relativity admits no asymptotically well-behaved static
spherically symmetric traversable wormholes supported by classical scalar
fields and nonexotic matter. The theorem holds for all values of the scalar
field curvature coupling parameter $\xi$, even though fields with $\xi>0$ are
capable of vi... | [
{
"created": "Fri, 13 Mar 2015 17:01:38 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2015 15:39:29 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Butcher",
"Luke M.",
""
]
] | I prove that general relativity admits no asymptotically well-behaved static spherically symmetric traversable wormholes supported by classical scalar fields and nonexotic matter. The theorem holds for all values of the scalar field curvature coupling parameter $\xi$, even though fields with $\xi>0$ are capable of viol... |
1607.07406 | Gregory B. Cook | Gregory B. Cook and Maxim Zalutskiy | Modes of the Kerr geometry with purely imaginary frequencies | 23 pages, 22 figures, submitted to Phys. Rev. D | null | 10.1103/PhysRevD.94.104074 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine the behavior of modes of the Kerr geometry when the
mode's frequency is purely imaginary. We demonstrate that quasinormal modes
must be polynomial in nature if their frequency is purely imaginary, and
present a method for computing such modes. The nature of these modes, however,
is not alway... | [
{
"created": "Mon, 25 Jul 2016 18:58:22 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Cook",
"Gregory B.",
""
],
[
"Zalutskiy",
"Maxim",
""
]
] | In this paper, we examine the behavior of modes of the Kerr geometry when the mode's frequency is purely imaginary. We demonstrate that quasinormal modes must be polynomial in nature if their frequency is purely imaginary, and present a method for computing such modes. The nature of these modes, however, is not always ... |
gr-qc/0310048 | Juan A. Valiente-Kroon | Juan A. Valiente Kroon | On the nonexistence of conformally flat slices in the Kerr and other
stationary spacetimes | null | Phys.Rev.Lett.92:041101,2004 | 10.1103/PhysRevLett.92.041101 | null | gr-qc | null | It is proved that a stationary solutions to the vacuum Einstein field
equations with non-vanishing angular momentum have no Cauchy slice that is
maximal, conformally flat, and non-boosted. The proof is based on results
coming from a certain type of asymptotic expansions near null and spatial
infinity --which also sho... | [
{
"created": "Wed, 8 Oct 2003 15:18:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kroon",
"Juan A. Valiente",
""
]
] | It is proved that a stationary solutions to the vacuum Einstein field equations with non-vanishing angular momentum have no Cauchy slice that is maximal, conformally flat, and non-boosted. The proof is based on results coming from a certain type of asymptotic expansions near null and spatial infinity --which also show ... |
gr-qc/9606012 | Osamu Iguchi | O.Iguchi, H.Ishihara, J.Soda | Inhomogeneity of Spatial Curvature for Inflation | 17 pages, revtex, 6 figures included using epsf | Phys.Rev.D55:3337-3345,1997 | 10.1103/PhysRevD.55.3337 | TIT/HEP-324/COSMO-69, KUCP/U-0098 | gr-qc | null | We study how the initial inhomogeneities of the spatial curvature affect the
onset of inflation in the closed universe. We consider a cosmological model
which contains a radiation and a cosmological constant. In order to treat the
inhomogeneities in the closed universe, we improve the long wavelength
approximation su... | [
{
"created": "Fri, 7 Jun 1996 14:25:11 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Iguchi",
"O.",
""
],
[
"Ishihara",
"H.",
""
],
[
"Soda",
"J.",
""
]
] | We study how the initial inhomogeneities of the spatial curvature affect the onset of inflation in the closed universe. We consider a cosmological model which contains a radiation and a cosmological constant. In order to treat the inhomogeneities in the closed universe, we improve the long wavelength approximation such... |
1911.08726 | Colin MacLaurin | Colin MacLaurin | Cosmic cable | 6 pages, 0 figures, submitted to the proceedings of the 2018 Marcel
Grossmann conference in Rome | p.1154--59 in Battistelli, Jantzen & Ruffini, eds., The Fifteenth
Marcel Grossmann Meeting (World Scientific, 2022, vol. 2) | 10.1142/9789811258251_0162 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I investigate the relativistic mechanics of an extended "cable" in an
arbitrary static, spherically symmetric spacetime. Such hypothetical bodies
have been proposed as tests of energy and thermodynamics: by lowering objects
toward a black hole, scooping up Hawking radiation, or mining energy from the
expansion of the... | [
{
"created": "Wed, 20 Nov 2019 06:16:48 GMT",
"version": "v1"
}
] | 2022-09-05 | [
[
"MacLaurin",
"Colin",
""
]
] | I investigate the relativistic mechanics of an extended "cable" in an arbitrary static, spherically symmetric spacetime. Such hypothetical bodies have been proposed as tests of energy and thermodynamics: by lowering objects toward a black hole, scooping up Hawking radiation, or mining energy from the expansion of the u... |
gr-qc/9503018 | Martin Rainer | U. Bleyer, M. Rainer, A. Zhuk | A POSSIBLE SOLUTION TO THE PROBLEM OF EXTRA DIMENSIONS | 15 pages, latex | null | null | UNIPO-GRAV-94-11 | gr-qc | null | We consider a multidimensional universe with the topology $M= \R\times
M_1\times \cdots \times M_n$, where the $M_i$ ($i>1$) are $d_i$-dimensional
Ricci flat spaces. Exploiting a conformal equivalence between minimal coupling
models and conformal coupling models, we get exact solutions for such an
universe filled by ... | [
{
"created": "Fri, 10 Mar 1995 20:44:49 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Bleyer",
"U.",
""
],
[
"Rainer",
"M.",
""
],
[
"Zhuk",
"A.",
""
]
] | We consider a multidimensional universe with the topology $M= \R\times M_1\times \cdots \times M_n$, where the $M_i$ ($i>1$) are $d_i$-dimensional Ricci flat spaces. Exploiting a conformal equivalence between minimal coupling models and conformal coupling models, we get exact solutions for such an universe filled by a ... |
1806.03904 | Alfred Molina | Alfred Molina and Eduardo Ruiz | An approximate global solution of Einstein's equations for a rotating
two layers star | 13 pages. arXiv admin note: substantial text overlap with
arXiv:1702.05908 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain an approximate global stationary and axisymmetric solution of
Einstein's equations which can be thought as a simple two layers star model: a
self-gravitating ball built up by two layers of perfect fluid having different
linear equation of state moving in a rigid motion pattern. Using the
post-Min\-kows\-kia... | [
{
"created": "Mon, 11 Jun 2018 11:03:48 GMT",
"version": "v1"
}
] | 2018-06-12 | [
[
"Molina",
"Alfred",
""
],
[
"Ruiz",
"Eduardo",
""
]
] | We obtain an approximate global stationary and axisymmetric solution of Einstein's equations which can be thought as a simple two layers star model: a self-gravitating ball built up by two layers of perfect fluid having different linear equation of state moving in a rigid motion pattern. Using the post-Min\-kows\-kian ... |
1708.09293 | Gregory Horndeski | Gregory W. Horndeski | Conformally Invariant Vector-Tensor Field Theories Consistent with
Conservation of Charge in a Four-Dimensional Space | 41 pages. In this paper I correct various typos, grammatical errors
and mental lapses, that appeared in an earlier version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper I shall construct, in a four-dimensional space, all
vector-tensor field theories that are conformally invariant, consistent with
conservation of charge, and flat space compatible. By the last assumption I
mean that the Lagrangian of the theory in question, is well defined and
differentiable, when evalua... | [
{
"created": "Tue, 29 Aug 2017 03:38:27 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Nov 2017 02:34:30 GMT",
"version": "v2"
}
] | 2017-11-07 | [
[
"Horndeski",
"Gregory W.",
""
]
] | In this paper I shall construct, in a four-dimensional space, all vector-tensor field theories that are conformally invariant, consistent with conservation of charge, and flat space compatible. By the last assumption I mean that the Lagrangian of the theory in question, is well defined and differentiable, when evaluate... |
0709.1072 | Laszlo B. Szabados | Laszlo B. Szabados | Total angular momentum from Dirac eigenspinors | 34 pages, typos corrected, four references added, appearing in Class.
Quantum Grav | Class.Quant.Grav.25:025007,2008 | 10.1088/0264-9381/25/2/025007 | null | gr-qc | null | The eigenvalue problem for Dirac operators, constructed from two connections
on the spinor bundle over closed spacelike 2-surfaces, is investigated. A class
of divergence free vector fields, built from the eigenspinors, are found,
which, for the lowest eigenvalue, reproduce the rotation Killing vectors of
metric sphe... | [
{
"created": "Fri, 7 Sep 2007 13:06:06 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Dec 2007 15:12:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Szabados",
"Laszlo B.",
""
]
] | The eigenvalue problem for Dirac operators, constructed from two connections on the spinor bundle over closed spacelike 2-surfaces, is investigated. A class of divergence free vector fields, built from the eigenspinors, are found, which, for the lowest eigenvalue, reproduce the rotation Killing vectors of metric sphere... |
1311.1281 | Shahar Hod | Shahar Hod | Analytic toy-model for the ISCO shift | 8 pages | Physical Review D 87, 024036 (2013) | 10.1103/PhysRevD.87.024036 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple black-hole-ring system is proposed as a toy model for the two-body
problem in general relativity. This toy-model yields the fractional shift
$\Delta\Omega_{\text{isco}}/\Omega_{\text{isco}}={{29}\over{81\sqrt{2}}}\eta$
in the Schwarzschild ISCO (innermost stable circular orbit) frequency, where
$\eta\equiv m... | [
{
"created": "Wed, 6 Nov 2013 03:24:17 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Hod",
"Shahar",
""
]
] | A simple black-hole-ring system is proposed as a toy model for the two-body problem in general relativity. This toy-model yields the fractional shift $\Delta\Omega_{\text{isco}}/\Omega_{\text{isco}}={{29}\over{81\sqrt{2}}}\eta$ in the Schwarzschild ISCO (innermost stable circular orbit) frequency, where $\eta\equiv m/M... |
gr-qc/0611012 | Lau Loi So | Lau Loi So and T. Vargas | The Energy of Bianchi Type I and II Universes in Teleparallel Gravity | 9 pages | Chin.J.Phys. 43 (2005) 901-908 | null | null | gr-qc | null | For certain models, the energy of the universe which includes the energy of
both the matter and the gravitational fields is obtained by using the
quasilocal energy-momentum in teleparallel gravity. It is shown that in the
case of the Bianchi type I and II universes, not only the total energy but also
the quasilocal e... | [
{
"created": "Thu, 2 Nov 2006 10:11:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"So",
"Lau Loi",
""
],
[
"Vargas",
"T.",
""
]
] | For certain models, the energy of the universe which includes the energy of both the matter and the gravitational fields is obtained by using the quasilocal energy-momentum in teleparallel gravity. It is shown that in the case of the Bianchi type I and II universes, not only the total energy but also the quasilocal ene... |
1212.0371 | Olaf Dreyer | Olaf Dreyer | Not on but of | This article received a forth prize in the 2012 FQXi essay contest
"Questioning the Foundations". More articles from this contest can be found
on the FQXi website at fqxi.org | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In physics we encounter particles in one of two ways. Either as fundamental
constituents of the theory or as emergent excitations. These two ways differ by
how the particle relates to the background. It either sits on the background,
or it is an excitation of the background. We argue that by choosing the former
to co... | [
{
"created": "Mon, 3 Dec 2012 12:59:44 GMT",
"version": "v1"
}
] | 2012-12-04 | [
[
"Dreyer",
"Olaf",
""
]
] | In physics we encounter particles in one of two ways. Either as fundamental constituents of the theory or as emergent excitations. These two ways differ by how the particle relates to the background. It either sits on the background, or it is an excitation of the background. We argue that by choosing the former to cons... |
gr-qc/0612187 | Alexander Burinskii | Alexander Burinskii | Kerr's Gravity as a Quantum Gravity on the Compton Level | 3 p. 2 figs. Talk at the Quantum Gravity 1 session of the MG11
Meeting, Berlin 2006, v.2, minor corrections | null | null | null | gr-qc hep-th | null | The Dirac theory of electron and QED neglect gravitational field, while the
corresponding to electron Kerr-Newman gravitational field has very strong
influence on the Compton distances. It polarizes space-time, deforms the
Coulomb field and changes topology. We argue that the Kerr geometry may be
hidden beyond the Qu... | [
{
"created": "Fri, 29 Dec 2006 11:30:13 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2007 15:14:25 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Burinskii",
"Alexander",
""
]
] | The Dirac theory of electron and QED neglect gravitational field, while the corresponding to electron Kerr-Newman gravitational field has very strong influence on the Compton distances. It polarizes space-time, deforms the Coulomb field and changes topology. We argue that the Kerr geometry may be hidden beyond the Quan... |
0911.3140 | Diego Pantoja | Nelson Pinto-Neto and Diego Moraes Pantoja | Bohmian Quantization of the Big Rip | 11 pages, 6 figures, published in Phys. Rev. D | Phys.Rev.D80:083509,2009 | 10.1103/PhysRevD.80.083509 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | It is shown in this paper that minisuperspace quantization of homogeneous and
isotropic geometries with phantom scalar fields, when examined in the light of
the Bohm-de Broglie interpretation of quantum mechanics, does not eliminate, in
general, the classical big rip singularity present in the classical model. For
so... | [
{
"created": "Mon, 16 Nov 2009 20:34:00 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Nov 2009 21:22:47 GMT",
"version": "v2"
}
] | 2010-04-22 | [
[
"Pinto-Neto",
"Nelson",
""
],
[
"Pantoja",
"Diego Moraes",
""
]
] | It is shown in this paper that minisuperspace quantization of homogeneous and isotropic geometries with phantom scalar fields, when examined in the light of the Bohm-de Broglie interpretation of quantum mechanics, does not eliminate, in general, the classical big rip singularity present in the classical model. For some... |
gr-qc/0203104 | Dr Mayeul Arminjon | Mayeul Arminjon | Remarks on the mathematical origin of wave mechanics and consequences
for a quantum mechanics in a gravitational field | PS, 23 pages. Sixth International Conference "Physical
Interpretations of Relativity Theory" (London, September 1998), Proceedings
(M.C. Duffy, edr.), British Soc. Philos. Sci. /University of Sunderland,
1998, pp. 1-17. Font changed here | Physical Interpretations of Relativity Theory VI, Proceedings
(M.C. Duffy, edr.), British Soc. Philos. Sci. /University of Sunderland
(1998), pp. 1-17 | null | null | gr-qc quant-ph | null | According to Schroedinger's ideas, classical dynamics of point particles
should correspond to the " geometrical optics " limit of a linear wave
equation, in the same way as ray optics is the limit of wave optics. It is
shown that, using notions of modern wave theory, the " geometrical optics "
analogy leads to the co... | [
{
"created": "Thu, 28 Mar 2002 17:18:26 GMT",
"version": "v1"
}
] | 2007-11-19 | [
[
"Arminjon",
"Mayeul",
""
]
] | According to Schroedinger's ideas, classical dynamics of point particles should correspond to the " geometrical optics " limit of a linear wave equation, in the same way as ray optics is the limit of wave optics. It is shown that, using notions of modern wave theory, the " geometrical optics " analogy leads to the corr... |
1904.00711 | Kimet Jusufi | Sumarna Haroon, Kimet Jusufi, Mubasher Jamil | Shadow Images of a Rotating Dyonic Black Hole with a Global Monopole
Surrounded by Perfect Fluid | 25 pages, 6 figures. Accepted for publication in Universe | Universe 2020, 6(2), 23 | 10.3390/universe6020023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we revisit and extend the prior work of Filho and Bezerra
[Phys. Rev D, 64, 084009 (2001)] to rotating dyonic global monopoles in
presence of a perfect fluid. We then show that the surface topology at the
event horizon, related to the metric computed, is a 2- sphere using the
Gauss-Bonnet theorem. By ch... | [
{
"created": "Mon, 1 Apr 2019 11:59:16 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Nov 2019 13:06:35 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Jan 2020 09:46:38 GMT",
"version": "v3"
}
] | 2020-01-28 | [
[
"Haroon",
"Sumarna",
""
],
[
"Jusufi",
"Kimet",
""
],
[
"Jamil",
"Mubasher",
""
]
] | In this paper we revisit and extend the prior work of Filho and Bezerra [Phys. Rev D, 64, 084009 (2001)] to rotating dyonic global monopoles in presence of a perfect fluid. We then show that the surface topology at the event horizon, related to the metric computed, is a 2- sphere using the Gauss-Bonnet theorem. By choo... |
gr-qc/0604071 | Claudia de Rham | Claudia de Rham, Tetsuya Shiromizu and Andrew J. Tolley | Weaker Gravity at Submillimetre Scales in Braneworld Models | References added, typos corrected | null | null | null | gr-qc astro-ph hep-th | null | Braneworld models typically predict gravity to grow stronger at short
distances. In this paper, we consider braneworlds with two types of additional
curvature couplings, a Gauss-Bonnet term in the bulk, and an Einstein-Hilbert
(EH) term on the brane. In the regime where these terms are dominant over the
bulk EH term,... | [
{
"created": "Mon, 17 Apr 2006 15:57:03 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2006 22:45:16 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"de Rham",
"Claudia",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Tolley",
"Andrew J.",
""
]
] | Braneworld models typically predict gravity to grow stronger at short distances. In this paper, we consider braneworlds with two types of additional curvature couplings, a Gauss-Bonnet term in the bulk, and an Einstein-Hilbert (EH) term on the brane. In the regime where these terms are dominant over the bulk EH term, l... |
2107.10876 | Antonio C. Guti\'errez-Pi\~neres | A. C. Guti\'errez-Pi\~neres, N. Hern\'andez, and C. S. Lopez-Monsalvo | Newman-Janis Ansatz for rotating wormholes | Paper prepared for presentation at the XXII International Meeting
Physical Interpretations of Relativity Theory - 2021 (Moscow, Russia) | null | 10.1088/1742-6596/2081/1/012005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A central problem in General Relativity is obtaining a solution to describe
the source's interior counterpart for Kerr black hole. Besides, determining a
method to match the interior and exterior solutions through a surface free of
predefined coordinates remains an open problem. In this work, we present the
ansatz fo... | [
{
"created": "Thu, 22 Jul 2021 18:11:48 GMT",
"version": "v1"
}
] | 2021-12-08 | [
[
"Gutiérrez-Piñeres",
"A. C.",
""
],
[
"Hernández",
"N.",
""
],
[
"Lopez-Monsalvo",
"C. S.",
""
]
] | A central problem in General Relativity is obtaining a solution to describe the source's interior counterpart for Kerr black hole. Besides, determining a method to match the interior and exterior solutions through a surface free of predefined coordinates remains an open problem. In this work, we present the ansatz form... |
1905.13033 | Tanmoy Paul | Tanmoy Paul | Holographic correspondence of $F(R)$ gravity with/without matter fields | EPL accepted | null | 10.1209/0295-5075/127/20004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we apply the holographic principle at the early universe,
obtaining an inflation realization of holographic origin. First we show that
under the consideration of extended infrared cut-offs, there exist a
holographic correspondence of various F(R) (such as quadratic, cubic,
exponential F(R) models) cosm... | [
{
"created": "Wed, 29 May 2019 04:31:29 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jul 2019 16:46:05 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Paul",
"Tanmoy",
""
]
] | In this paper, we apply the holographic principle at the early universe, obtaining an inflation realization of holographic origin. First we show that under the consideration of extended infrared cut-offs, there exist a holographic correspondence of various F(R) (such as quadratic, cubic, exponential F(R) models) cosmol... |
1405.5392 | Izzet Sakalli | I. Sakalli, A. Ovgun and S.F. Mirekhtiary | Gravitational Lensing Effect on the Hawking Radiation of Dyonic Black
Holes | DOI has been added | Int. J. Geom. Methods Mod. Phys. 11, 1450074 (2014) | 10.1142/S0219887814500741 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we analyze the Hawking radiation (HR) of a non-asymptotically
flat (NAF) dyonic black hole (dBH) in four-dimensional (4D)
Einstein-Maxwell-Dilaton (EMD) gravity by using one of the semiclassical
approaches which is the so-called Hamilton-Jacobi (HJ) method. We particularly
motivate on the isotropic coo... | [
{
"created": "Wed, 21 May 2014 12:21:19 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2014 11:17:00 GMT",
"version": "v2"
}
] | 2015-04-27 | [
[
"Sakalli",
"I.",
""
],
[
"Ovgun",
"A.",
""
],
[
"Mirekhtiary",
"S. F.",
""
]
] | In this paper, we analyze the Hawking radiation (HR) of a non-asymptotically flat (NAF) dyonic black hole (dBH) in four-dimensional (4D) Einstein-Maxwell-Dilaton (EMD) gravity by using one of the semiclassical approaches which is the so-called Hamilton-Jacobi (HJ) method. We particularly motivate on the isotropic coord... |
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