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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1502.00287 | Michael Kunzinger | Michael Kunzinger, Roland Steinbauer, James A. Vickers | The Penrose singularity theorem in regularity $C^{1,1}$ | 13 pages. Final version | Classical Quantum Gravity 32 (2015), no. 15, 155010, 12 pp | 10.1088/0264-9381/32/15/155010 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the validity of the Penrose singularity theorem to spacetime
metrics of regularity $C^{1,1}$. The proof is based on regularisation
techniques, combined with recent results in low regularity causality theory.
| [
{
"created": "Sun, 1 Feb 2015 17:09:09 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2015 20:20:10 GMT",
"version": "v2"
}
] | 2016-09-15 | [
[
"Kunzinger",
"Michael",
""
],
[
"Steinbauer",
"Roland",
""
],
[
"Vickers",
"James A.",
""
]
] | We extend the validity of the Penrose singularity theorem to spacetime metrics of regularity $C^{1,1}$. The proof is based on regularisation techniques, combined with recent results in low regularity causality theory. |
gr-qc/0512140 | H Mohseni Sadjadi | H. Mohseni Sadjadi | Generalized second law in phantom dominated universe | 8 pages, 2 figures. Typos corrected. References added. GSL in the
transition time (from quintessence to phantom phase) discussed. To be
published in Phys. Rev. D | Phys.Rev. D73 (2006) 063525 | null | null | gr-qc | null | We study the conditions of validity of generalized second law in phantom
dominated era.
| [
{
"created": "Fri, 23 Dec 2005 04:43:31 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2006 18:42:28 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sadjadi",
"H. Mohseni",
""
]
] | We study the conditions of validity of generalized second law in phantom dominated era. |
gr-qc/0410110 | Lorenzo Iorio | Lorenzo Iorio | Some comments about a recent paper on the measurement of the general
relativistic Lense-Thirring effect in the gravitational field of the Earth
with the laser-ranged LAGEOS and LAGEOS II satellites | Latex2e, 8 pages, no tables, no figures, 17 references. It refers to
the Letter to Nature I. Ciufolini and E.C. Pavlis, Nature, 431, 958-960,
2004. Scientific criticisms on the released error budget presented | null | null | null | gr-qc astro-ph physics.geo-ph physics.space-ph | null | In this brief note some comments about the observable used in a recently
published paper on the measurement of the general relativistic Lense-Thirring
in the gravitational field of the Earth are presented. It turns out that, among
other things, the authors might have yielded an optimistic evaluation of the
error budg... | [
{
"created": "Thu, 21 Oct 2004 14:22:51 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2004 15:56:42 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Oct 2004 00:47:47 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Oct 2004 14:14:04 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this brief note some comments about the observable used in a recently published paper on the measurement of the general relativistic Lense-Thirring in the gravitational field of the Earth are presented. It turns out that, among other things, the authors might have yielded an optimistic evaluation of the error budget... |
gr-qc/9908066 | Richard F. Stark | Leonardo Sigalotti and Richard F. Stark | Test Evolution of Non-Axisymmetric Gravitational Waves | 23 pages including 11 ps figures, TeX, submitted to Class.Quantum
Grav | null | null | null | gr-qc | null | We give a preliminary report on one of the tests we have performed of a full
non-axisymmetric general relativistic code. The test considered here concerns
the numerical evolution of vacuum non-axisymmetric gravitational waves and
their comparison at low amplitudes with theoretical waveforms obtained from
linearised t... | [
{
"created": "Wed, 25 Aug 1999 13:44:07 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Sigalotti",
"Leonardo",
""
],
[
"Stark",
"Richard F.",
""
]
] | We give a preliminary report on one of the tests we have performed of a full non-axisymmetric general relativistic code. The test considered here concerns the numerical evolution of vacuum non-axisymmetric gravitational waves and their comparison at low amplitudes with theoretical waveforms obtained from linearised the... |
gr-qc/0011097 | Luis Anchordoqui | Luis A. Anchordoqui, S. Capozziello, G. Lambiase, and Diego F. Torres | Radiation from a uniformly accelerated charge in the outskirts of a
wormhole throat | 6 pages revtex, 1 eps figure. To be published in Modern Physics
Letters A | Mod.Phys.Lett.A15:2219-2228,2000 | 10.1142/S0217732300002516 | null | gr-qc | null | Using traversable wormholes as theoretical background, we revisit a deep
question of general relativity: Does a uniformly accelerated charged particle
radiate? We particularize to the recently proposed gravitational \v{C}erenkov
radiation, that happens when the spatial part of the Ricci tensor is negative.
If $^{^{(3... | [
{
"created": "Mon, 27 Nov 2000 18:20:52 GMT",
"version": "v1"
}
] | 2011-09-12 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Capozziello",
"S.",
""
],
[
"Lambiase",
"G.",
""
],
[
"Torres",
"Diego F.",
""
]
] | Using traversable wormholes as theoretical background, we revisit a deep question of general relativity: Does a uniformly accelerated charged particle radiate? We particularize to the recently proposed gravitational \v{C}erenkov radiation, that happens when the spatial part of the Ricci tensor is negative. If $^{^{(3+1... |
gr-qc/0406026 | Anzhong Wang | R. Chan, M. F. A. da Silva, J. F. Villas da Rocha, and Anzhong Wang | Collapsing Scalar Field with Kinematic Self-Similarity of the Second
Kind in 2+1 Gravity | latex, two figure. To appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys.D14:1049-1062,2005 | 10.1142/S0218271805006882 | CASPER-04-06 | gr-qc | null | All the 2+1-dimensional circularly symmetric solutions with kinematic
self-similarity of the second kind to the Einstein-massless-scalar field
equations are found and their local and global properties are studied. It is
found that some of them represent gravitational collapse of a massless scalar
field, in which blac... | [
{
"created": "Tue, 8 Jun 2004 02:21:49 GMT",
"version": "v1"
}
] | 2009-07-07 | [
[
"Chan",
"R.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"da Rocha",
"J. F. Villas",
""
],
[
"Wang",
"Anzhong",
""
]
] | All the 2+1-dimensional circularly symmetric solutions with kinematic self-similarity of the second kind to the Einstein-massless-scalar field equations are found and their local and global properties are studied. It is found that some of them represent gravitational collapse of a massless scalar field, in which black ... |
1107.1250 | Alexandre Yale | Alexandre Yale | Simple counterterms for asymptotically AdS spacetimes in Lovelock
gravity | 16 pages. v3: title and presentation updated to match published
version. Explicit expressions for 4th-order Lovelock Lagrangians and
Gibbons-Hawking terms can be found in v2 | Phys. Rev. D 84, 104036 (2011) | 10.1103/PhysRevD.84.104036 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although gravitational actions diverge in asymptotically AdS spacetimes,
boundary counterterms can be added in order to cancel out those divergences;
such counterterms are known in general to third order in the Riemann tensor for
the Einstein-Hilbert action. Considering foliations of AdS with an $S^m \times
H^{d-m}$ ... | [
{
"created": "Wed, 6 Jul 2011 20:29:15 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2011 15:46:14 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Nov 2011 21:41:45 GMT",
"version": "v3"
}
] | 2011-12-01 | [
[
"Yale",
"Alexandre",
""
]
] | Although gravitational actions diverge in asymptotically AdS spacetimes, boundary counterterms can be added in order to cancel out those divergences; such counterterms are known in general to third order in the Riemann tensor for the Einstein-Hilbert action. Considering foliations of AdS with an $S^m \times H^{d-m}$ bo... |
2204.02138 | Fethi M. Ramazanoglu | Semih Tuna, K{\i}van\c{c} \.I. \"Unl\"ut\"urk, Fethi M.
Ramazano\u{g}lu | Constraining scalar-tensor theories using neutron star mass and radius
measurements | 18 pages, 14 figures. Published version | Phys. Rev. D 105, 124070 (2022) | 10.1103/PhysRevD.105.124070 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We use neutron star mass and radius measurements to constrain the spontaneous
scalarization phenomenon in scalar-tensor theories using Bayesian analysis.
Neutron star structures in this scenario can be significantly different from
the case of general relativity, which can be used to constrain the theory
parameters. W... | [
{
"created": "Tue, 5 Apr 2022 12:03:01 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jul 2022 19:22:53 GMT",
"version": "v2"
}
] | 2022-07-06 | [
[
"Tuna",
"Semih",
""
],
[
"Ünlütürk",
"Kıvanç İ.",
""
],
[
"Ramazanoğlu",
"Fethi M.",
""
]
] | We use neutron star mass and radius measurements to constrain the spontaneous scalarization phenomenon in scalar-tensor theories using Bayesian analysis. Neutron star structures in this scenario can be significantly different from the case of general relativity, which can be used to constrain the theory parameters. We ... |
1804.06070 | Sajal Mukherjee | Sajal Mukherjee and Rajesh Kumble Nayak | Off-equatorial stable circular orbits for spinning particles | 17 pages, 11 figures, 1 table, Accepted for publication in Physical
Review D | Phys. Rev. D 98, 084023 (2018) | 10.1103/PhysRevD.98.084023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we investigate the motion of a spinning particle at a
constant inclination, different from the equatorial plane, around a Kerr black
hole. We mainly explore the possibilities of stable circular orbits for
different spin supplementary conditions. The Mathission-Papapetrau's equations
are extensively a... | [
{
"created": "Tue, 17 Apr 2018 06:47:39 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Sep 2018 04:58:32 GMT",
"version": "v2"
}
] | 2018-10-24 | [
[
"Mukherjee",
"Sajal",
""
],
[
"Nayak",
"Rajesh Kumble",
""
]
] | In this article, we investigate the motion of a spinning particle at a constant inclination, different from the equatorial plane, around a Kerr black hole. We mainly explore the possibilities of stable circular orbits for different spin supplementary conditions. The Mathission-Papapetrau's equations are extensively app... |
0710.4902 | Robert T. Jantzen | Donato Bini, Christian Cherubini, Robert T. Jantzen | The Lifshitz-Khalatnikov Kasner index parametrization and the Weyl
Tensor | 16 page Latex cimento.cls formatted document with 6 EPS figures annd
2 PicTeX figures; to appear in the Proceedings of the First Italian-Pakistan
Workshop on Relativistic Astrophysics which will be published as a special
issue of Nuovo Cimento B | Nuovo Cim.B122:521-536,2007 | 10.1393/ncb/i2007-10396-4 | null | gr-qc | null | The scale invariant Petrov classification of the Weyl tensor is linked to the
scale invariant combination of the Kasner index constraints, and the
Lifshitz-Khalatnikov Kasner index parametrization scheme turns out to be a
natural way of adapting to this symmetry, while hiding the permutation symmetry
that is instead ... | [
{
"created": "Thu, 25 Oct 2007 15:55:14 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Bini",
"Donato",
""
],
[
"Cherubini",
"Christian",
""
],
[
"Jantzen",
"Robert T.",
""
]
] | The scale invariant Petrov classification of the Weyl tensor is linked to the scale invariant combination of the Kasner index constraints, and the Lifshitz-Khalatnikov Kasner index parametrization scheme turns out to be a natural way of adapting to this symmetry, while hiding the permutation symmetry that is instead ma... |
1707.07542 | Cl\'ementine Hauret | Hauret Clementine, Magain Pierre and Biernaux Judith | Cosmological Time, Entropy and Infinity | 11 pages, 5 figures. arXiv admin note: substantial text overlap with
arXiv:1505.02052 | Entropy, 19, 357 (2017) | 10.3390/e19070357 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Time is a parameter playing a central role in our most fundamental modelling
of natural laws. Relativity theory shows that the comparison of times measured
by different clocks depends on their relative motion and on the strength of the
gravitational field in which they are embedded. In standard cosmology, the time
pa... | [
{
"created": "Wed, 19 Jul 2017 13:30:32 GMT",
"version": "v1"
}
] | 2017-07-25 | [
[
"Clementine",
"Hauret",
""
],
[
"Pierre",
"Magain",
""
],
[
"Judith",
"Biernaux",
""
]
] | Time is a parameter playing a central role in our most fundamental modelling of natural laws. Relativity theory shows that the comparison of times measured by different clocks depends on their relative motion and on the strength of the gravitational field in which they are embedded. In standard cosmology, the time para... |
2304.05609 | Swastik Bhattacharya | Anamika Avinash Pathak, Konka Raviteja, Swastik Bhattacharya,
Sashideep Gutti | Surface Gravity of Dynamical Horizons: A Causal Perspective | 9 pages, no figures, comments welcome | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider marginally trapped surfaces in a spherically symmetric spacetime
evolving due to the presence of a perfect fluid in D-dimensions and look at the
various definitions of the surface gravity for these marginally trapped
surfaces. We show that using Einstein equations it is possible to simplify and
obtain gen... | [
{
"created": "Wed, 12 Apr 2023 05:01:26 GMT",
"version": "v1"
}
] | 2023-04-13 | [
[
"Pathak",
"Anamika Avinash",
""
],
[
"Raviteja",
"Konka",
""
],
[
"Bhattacharya",
"Swastik",
""
],
[
"Gutti",
"Sashideep",
""
]
] | We consider marginally trapped surfaces in a spherically symmetric spacetime evolving due to the presence of a perfect fluid in D-dimensions and look at the various definitions of the surface gravity for these marginally trapped surfaces. We show that using Einstein equations it is possible to simplify and obtain gener... |
0709.3314 | Zhong Chao Wu | Zhong Chao Wu | The Cosmological Constant is Probably Zero, and a Proof is Possibly
Right | 6 pages, modified version | Phys.Lett.B659:891-893,2008 | 10.1016/j.physletb.2007.12.019 | ZJUT07-09 | gr-qc astro-ph hep-th | null | Hawking proposed that the cosmological constant is probably zero in quantum
cosmology. Duff claimed that Hawking's proof is invalidated. Using the right
configuration for the wave function of the universe, we provide a complete
proof.
| [
{
"created": "Fri, 21 Sep 2007 16:07:53 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Oct 2007 17:17:18 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Nov 2007 18:24:43 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Wu",
"Zhong Chao",
""
]
] | Hawking proposed that the cosmological constant is probably zero in quantum cosmology. Duff claimed that Hawking's proof is invalidated. Using the right configuration for the wave function of the universe, we provide a complete proof. |
1509.02535 | Andrey Shoom A | Andrey A. Shoom | Synchrotron Radiation From Weakly Magnetized Schwarzschild Black Hole | 7 pages, 4 figures | null | 10.1103/PhysRevD.92.124066 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a synchrotron radiation from a charged particle moving in a bound
orbit around a weakly magnetized Schwarzschild black hole (a static black hole
immersed into a constant uniform magnetic field) in its equatorial plane,
perpendicular to the magnetic field. In particular, we study the case when the
Lorentz ... | [
{
"created": "Tue, 8 Sep 2015 20:13:12 GMT",
"version": "v1"
}
] | 2016-01-20 | [
[
"Shoom",
"Andrey A.",
""
]
] | We consider a synchrotron radiation from a charged particle moving in a bound orbit around a weakly magnetized Schwarzschild black hole (a static black hole immersed into a constant uniform magnetic field) in its equatorial plane, perpendicular to the magnetic field. In particular, we study the case when the Lorentz fo... |
1906.00802 | Jos\'e Crespo | J. A. Crespo and H. P. de Oliveira | Aspects of wave turbulence in preheating III: The case of the two-fields
models | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work is the continuation of the investigation of aspects of wave
turbulence in preheating we have started in Refs. [1, 2] but considering
several classes of inflationary two-fields models. We exhibit the main elements
of the wave turbulence phase imprinted in the power spectra of relevant
quantities in th... | [
{
"created": "Mon, 3 Jun 2019 13:41:30 GMT",
"version": "v1"
}
] | 2019-06-04 | [
[
"Crespo",
"J. A.",
""
],
[
"de Oliveira",
"H. P.",
""
]
] | The present work is the continuation of the investigation of aspects of wave turbulence in preheating we have started in Refs. [1, 2] but considering several classes of inflationary two-fields models. We exhibit the main elements of the wave turbulence phase imprinted in the power spectra of relevant quantities in the ... |
1402.4779 | Yousef Bisabr | Yousef Bisabr | Notes on the Chameleon Brans-Dicke Gravity | 9 pages, no figure. To appear in Astrophysics and Space Science.
arXiv admin note: text overlap with arXiv:0907.3838, arXiv:1005.5670,
arXiv:1212.2709 | Astrophys Space Sci (2014) 350:407-411 | 10.1007/s10509-013-1751-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a generalized Brans-Dicke model in which the scalar field has a
potential function and is also allowed to couple non-minimally with the matter
sector. This anomalous gravitational coupling can in principle avoid the model
to pass local gravity experiments. One then usually assumes that the scalar
field ha... | [
{
"created": "Wed, 19 Feb 2014 19:33:16 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Bisabr",
"Yousef",
""
]
] | We consider a generalized Brans-Dicke model in which the scalar field has a potential function and is also allowed to couple non-minimally with the matter sector. This anomalous gravitational coupling can in principle avoid the model to pass local gravity experiments. One then usually assumes that the scalar field has ... |
2103.06771 | Dirk Puetzfeld | Peter A. Hogan, Dirk Puetzfeld | Gravitational Waves with Colliding or Non--Colliding Wave Fronts | 8 pages, 1 figure | Phys. Rev. D 103, 124064 (2021) | 10.1103/PhysRevD.103.124064 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The known exact solutions of Einstein's vacuum field equations modeling the
gravitational fields of pure gravitational radiation involve wave fronts which
are either planar or roughly spherical. We describe a scheme designed to check
explicitly whether or not the wave fronts collide. From the spacetime point of
view ... | [
{
"created": "Thu, 11 Mar 2021 16:31:59 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jul 2021 14:30:01 GMT",
"version": "v2"
}
] | 2021-07-02 | [
[
"Hogan",
"Peter A.",
""
],
[
"Puetzfeld",
"Dirk",
""
]
] | The known exact solutions of Einstein's vacuum field equations modeling the gravitational fields of pure gravitational radiation involve wave fronts which are either planar or roughly spherical. We describe a scheme designed to check explicitly whether or not the wave fronts collide. From the spacetime point of view th... |
gr-qc/0506003 | Yasushi Mino | Yasushi Mino | Self-Force in the Radiation Reaction Formula -- Adiabatic Approximation
of a Metric Perturbation and an Orbit -- | published in Progress of Theoretical Physics Vol.113 No.4 pp.733 | Prog.Theor.Phys. 113 (2005) 733-761 | 10.1143/PTP.113.733 | null | gr-qc | null | We propose a new metric perturbation scheme under a possible constraint of
the gauge conditions in which we obtain a physically expected prediction of the
orbital evolution caused by the MiSaTaQuWa self-force. In this new scheme of a
metric perturbation, an adiabatic approximation is applied to both the metric
pertur... | [
{
"created": "Tue, 31 May 2005 23:12:03 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Mino",
"Yasushi",
""
]
] | We propose a new metric perturbation scheme under a possible constraint of the gauge conditions in which we obtain a physically expected prediction of the orbital evolution caused by the MiSaTaQuWa self-force. In this new scheme of a metric perturbation, an adiabatic approximation is applied to both the metric perturba... |
1711.05695 | Klaus Liegener Dr | Thorsten Lang, Klaus Liegener, Thomas Thiemann | Hamiltonian Renormalisation IV. Renormalisation Flow of D+1 dimensional
free scalar fields and Rotation Invariance | 28 pages | Class.Quant.Grav. 35 (2018) no.24, 245014 | 10.1088/1361-6382/aaec43 | null | gr-qc hep-lat hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we extend the test of Hamiltonian Renormalisation proposed in
this series of articles to the D-dimensional case using a massive free scalar
field. The concepts we introduce are explicitly computed for the D=2 case but
transfer immediately to higher dimensions. In this article we define and verify
a cr... | [
{
"created": "Wed, 15 Nov 2017 17:42:44 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jul 2019 15:48:42 GMT",
"version": "v2"
}
] | 2019-07-09 | [
[
"Lang",
"Thorsten",
""
],
[
"Liegener",
"Klaus",
""
],
[
"Thiemann",
"Thomas",
""
]
] | In this article we extend the test of Hamiltonian Renormalisation proposed in this series of articles to the D-dimensional case using a massive free scalar field. The concepts we introduce are explicitly computed for the D=2 case but transfer immediately to higher dimensions. In this article we define and verify a crit... |
1510.08471 | Kenneth Nordtvedt | Kenneth Nordtvedt | Constructing metric gravity's N-body non-linear Lagrangian from
iterative, linear algebraic scaling equations | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method for constructing metric gravity's N-body Lagrangian is developed
which uses iterative, liner algebraic euqations which enforce invariance
properties of gravity --- exterior effacement, interior effacement, and the
time dilation and Lorentz contraction of matter under boosts. The method is
demonstrated by obt... | [
{
"created": "Wed, 28 Oct 2015 20:19:07 GMT",
"version": "v1"
}
] | 2015-10-30 | [
[
"Nordtvedt",
"Kenneth",
""
]
] | A method for constructing metric gravity's N-body Lagrangian is developed which uses iterative, liner algebraic euqations which enforce invariance properties of gravity --- exterior effacement, interior effacement, and the time dilation and Lorentz contraction of matter under boosts. The method is demonstrated by obtai... |
2206.05839 | Georgios Fanaras | Georgios Fanaras, Alexander Vilenkin | The tunneling wavefunction in Kantowski-Sachs quantum cosmology | 31 pages, 4 figures | null | 10.1088/1475-7516/2022/08/069 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a path-integral approach to study the tunneling wave function in
quantum cosmology with spatial topology $S^{1}\times S^{2}$ and positive
cosmological constant (the Kantowski-Sachs model). If the initial scale factors
of both $S^1$ and $S^2$ are set equal to zero, the wave function describes
(semiclassically) ... | [
{
"created": "Sun, 12 Jun 2022 21:02:55 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Fanaras",
"Georgios",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | We use a path-integral approach to study the tunneling wave function in quantum cosmology with spatial topology $S^{1}\times S^{2}$ and positive cosmological constant (the Kantowski-Sachs model). If the initial scale factors of both $S^1$ and $S^2$ are set equal to zero, the wave function describes (semiclassically) a ... |
2008.04066 | Sourabh Nampalliwar | Sourabh Nampalliwar, Arthur G. Suvorov, Kostas D. Kokkotas | Testing horizon topology with electromagnetic observations | 15 pages, 9 figures. Comments welcome | Phys. Rev. D 102, 104035 (2020) | 10.1103/PhysRevD.102.104035 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity without a cosmological constant, a classical theorem
due to Hawking states that stationary black holes must be topologically
spherical. This result is one of the several ingredients that collectively
imply the uniqueness of the Kerr metric. If, however, general relativity
describes gravity inexa... | [
{
"created": "Mon, 10 Aug 2020 12:43:29 GMT",
"version": "v1"
}
] | 2020-11-18 | [
[
"Nampalliwar",
"Sourabh",
""
],
[
"Suvorov",
"Arthur G.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | In general relativity without a cosmological constant, a classical theorem due to Hawking states that stationary black holes must be topologically spherical. This result is one of the several ingredients that collectively imply the uniqueness of the Kerr metric. If, however, general relativity describes gravity inexact... |
1104.1908 | Taeyoon Moon | Taeyoon Moon, Yun Soo Myung, and Edwin J. Son | Stability analysis of f(R)-AdS black holes | 17 pages, 1 figure, version to appear in EPJC | null | 10.1140/epjc/s10052-011-1777-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the stability of f(R)-AdS (Schwarzschild-AdS) black hole obtained
from f(R) gravity. In order to resolve the difficulty of solving fourth order
linearized equations, we transform f(R) gravity into the scalar-tensor theory
by introducing two auxiliary scalars. In this case, the linearized curvature
scalar bec... | [
{
"created": "Mon, 11 Apr 2011 11:25:24 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2011 04:10:48 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Moon",
"Taeyoon",
""
],
[
"Myung",
"Yun Soo",
""
],
[
"Son",
"Edwin J.",
""
]
] | We study the stability of f(R)-AdS (Schwarzschild-AdS) black hole obtained from f(R) gravity. In order to resolve the difficulty of solving fourth order linearized equations, we transform f(R) gravity into the scalar-tensor theory by introducing two auxiliary scalars. In this case, the linearized curvature scalar becom... |
1401.6862 | Taeyoon Moon | Yun Soo Myung and Taeyoon Moon | Black hole stability in Jordan and Einstein frames | 1+15 pages, 1 figure, version to appear in PRD | Phys. Rev. D 89, 104009 (2014) | 10.1103/PhysRevD.89.104009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the classical stability of Schwarzschild black hole in Jordan
and Einstein frames which are related by the conformal transformations. For
this purpose, we introduce two models of the Brans-Dicke theory and
Brans-Dicke-Weyl gravity in Jordan frame and two corresponding models in the
Einstein frame. The ... | [
{
"created": "Mon, 27 Jan 2014 14:21:48 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Apr 2014 08:36:14 GMT",
"version": "v2"
}
] | 2014-05-14 | [
[
"Myung",
"Yun Soo",
""
],
[
"Moon",
"Taeyoon",
""
]
] | We investigate the classical stability of Schwarzschild black hole in Jordan and Einstein frames which are related by the conformal transformations. For this purpose, we introduce two models of the Brans-Dicke theory and Brans-Dicke-Weyl gravity in Jordan frame and two corresponding models in the Einstein frame. The fo... |
gr-qc/0202025 | Fernando P. Devecchi | G.M. Kremer and F.P. Devecchi | Thermodynamics and Kinetic Theory of Relativistic Gases in 2-D
Cosmological Models | 23 pages, accepted in PRD | Phys.Rev. D65 (2002) 083515 | 10.1103/PhysRevD.65.083515 | null | gr-qc | null | A kinetic theory of relativistic gases in a two-dimensional space is
developed in order to obtain the equilibrium distribution function and the
expressions for the fields of energy per particle, pressure, entropy per
particle and heat capacities in equilibrium. Furthermore, by using the method
of Chapman and Enskog f... | [
{
"created": "Thu, 7 Feb 2002 14:56:21 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kremer",
"G. M.",
""
],
[
"Devecchi",
"F. P.",
""
]
] | A kinetic theory of relativistic gases in a two-dimensional space is developed in order to obtain the equilibrium distribution function and the expressions for the fields of energy per particle, pressure, entropy per particle and heat capacities in equilibrium. Furthermore, by using the method of Chapman and Enskog for... |
2105.07313 | Liu Zhao | Xin Hao, Shaofan Liu and Liu Zhao | Relativistic transformation of thermodynamic parameters and refined Saha
equation | v4: BIG change: the transformation rules in previous versions are
flawed because they were based on the assumption that the form of the first
law remain unchanged under the change of observers, which proves to be false.
The new rules are based on the invariance of Gibbs-Duhem relation | null | null | null | gr-qc cond-mat.stat-mech hep-th | http://creativecommons.org/licenses/by/4.0/ | The relativistic transformation rule for temperature is a subject under
debate for more than 110 years. Several incompatible proposals exist in the
literature, but a final resolution is still missing. In this work, we
reconsider the problem of relativistic transformation rules for a number of
thermodynamic parameters... | [
{
"created": "Sat, 15 May 2021 23:28:12 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2021 07:08:43 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Sep 2021 04:07:39 GMT",
"version": "v3"
},
{
"created": "Wed, 22 Dec 2021 13:01:03 GMT",
"version": "v4"
}
] | 2021-12-23 | [
[
"Hao",
"Xin",
""
],
[
"Liu",
"Shaofan",
""
],
[
"Zhao",
"Liu",
""
]
] | The relativistic transformation rule for temperature is a subject under debate for more than 110 years. Several incompatible proposals exist in the literature, but a final resolution is still missing. In this work, we reconsider the problem of relativistic transformation rules for a number of thermodynamic parameters, ... |
2102.12477 | Abdel Nasser Tawfik | Abdel Nasser Tawfik, Carsten Greiner | Early Universe Thermodynamics and Evolution in Nonviscous and Viscous
Strong and Electroweak epochs: Possible Analytical Solutions | 27 pages, 5 figures, accepted for publication in ENTROPY | null | null | ECTP-2019-05, WLCAPP-2019-05 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Based on recent perturbative and non-perturbative lattice calculations with
almost quark flavors and the thermal contributions from photons, neutrinos,
leptons, electroweak particles, and scalar Higgs bosons, various thermodynamic
quantities, at vanishing net-baryon densities, such as pressure, energy
density, bulk v... | [
{
"created": "Wed, 24 Feb 2021 12:14:04 GMT",
"version": "v1"
}
] | 2021-02-26 | [
[
"Tawfik",
"Abdel Nasser",
""
],
[
"Greiner",
"Carsten",
""
]
] | Based on recent perturbative and non-perturbative lattice calculations with almost quark flavors and the thermal contributions from photons, neutrinos, leptons, electroweak particles, and scalar Higgs bosons, various thermodynamic quantities, at vanishing net-baryon densities, such as pressure, energy density, bulk vis... |
gr-qc/0503050 | George E. A. Matsas | Jorge Castineiras, Luis C. B. Crispino, George E. A. Matsas and
Rodrigo Murta | Semiclassical approach to black hole absorption of electromagnetic
radiation emitted by a rotating charge | 8 pages (revtex), 8 figures | Phys.Rev.D71:104013,2005 | 10.1103/PhysRevD.71.104013 | null | gr-qc | null | We consider an electric charge, minimally coupled to the Maxwell field,
rotating around a Schwarzschild black hole. We investigate how much of the
radiation emitted from the swirling charge is absorbed by the black hole and
show that most of the photons escape to infinity. For this purpose we use the
Gupta-Bleuler qu... | [
{
"created": "Fri, 11 Mar 2005 12:22:56 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Castineiras",
"Jorge",
""
],
[
"Crispino",
"Luis C. B.",
""
],
[
"Matsas",
"George E. A.",
""
],
[
"Murta",
"Rodrigo",
""
]
] | We consider an electric charge, minimally coupled to the Maxwell field, rotating around a Schwarzschild black hole. We investigate how much of the radiation emitted from the swirling charge is absorbed by the black hole and show that most of the photons escape to infinity. For this purpose we use the Gupta-Bleuler quan... |
1802.00841 | Zbigniew Haba | Z. Haba | Stabilization of Starobinsky-Vilenkin stochastic inflation by an
environmental noise | 18 pages | INtern.Journ.Modern Phys.D28(2019)1950085 | 10.1142/S0218271819500858 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the inflaton $\phi$ in an interaction with an infinite number of
fields treated as an environment (noise) with a friction $\gamma^{2}>0$. In a
Markovian approximation we obtain a stochastic wave equation (appearing also in
the warm inflation models). After the replacement of the environment by the
white no... | [
{
"created": "Fri, 2 Feb 2018 20:36:54 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2019 18:43:03 GMT",
"version": "v2"
}
] | 2019-02-18 | [
[
"Haba",
"Z.",
""
]
] | We discuss the inflaton $\phi$ in an interaction with an infinite number of fields treated as an environment (noise) with a friction $\gamma^{2}>0$. In a Markovian approximation we obtain a stochastic wave equation (appearing also in the warm inflation models). After the replacement of the environment by the white nois... |
1006.2525 | Philippe G. LeFloch | Florian Beyer and Philippe G. LeFloch | Second-order hyperbolic Fuchsian systems. Gowdy spacetimes and the
Fuchsian numerical algorithm | 22 pages. A shortened version is included in: F. Beyer and P.G.
LeFloch, Second-order hyperbolic Fuchsian systems and applications, Class.
Quantum Grav. 27 (2010), 245012 | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the second part of a series devoted to the singular initial value
problem for second-order hyperbolic Fuchsian systems. In the first part, we
defined and investigated this general class of systems, and we established a
well-posedness theory in weighted Sobolev spaces. This theory is applied here
to the vacuum... | [
{
"created": "Sun, 13 Jun 2010 11:03:08 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2011 20:57:19 GMT",
"version": "v2"
}
] | 2011-01-11 | [
[
"Beyer",
"Florian",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | This is the second part of a series devoted to the singular initial value problem for second-order hyperbolic Fuchsian systems. In the first part, we defined and investigated this general class of systems, and we established a well-posedness theory in weighted Sobolev spaces. This theory is applied here to the vacuum E... |
gr-qc/9409046 | Sucheta Koshti | Sucheta Koshti and Naresh Dadhich | The General Self-dual solution of the Einstein Equations | 14 Pages, Latex, IUCAA 94/29 | null | null | null | gr-qc | null | We obtain the most general explicit (anti)self-dual solution of the Einstein
equations. We find that any (anti)self-dual solution can be characterised by
three free functions of which one is harmonic. Any stationary (anti)self-dual
solution can be characterised by a harmonic function. It turns out that the
form of th... | [
{
"created": "Wed, 21 Sep 1994 11:51:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Koshti",
"Sucheta",
""
],
[
"Dadhich",
"Naresh",
""
]
] | We obtain the most general explicit (anti)self-dual solution of the Einstein equations. We find that any (anti)self-dual solution can be characterised by three free functions of which one is harmonic. Any stationary (anti)self-dual solution can be characterised by a harmonic function. It turns out that the form of the ... |
0804.0628 | Mark Hannam | Mark Hannam, Sascha Husa, Frank Ohme, Bernd Bruegmann, Niall
O'Murchadha | Wormholes and trumpets: the Schwarzschild spacetime for the
moving-puncture generation | 19 pages, 22 figures | Phys.Rev.D78:064020,2008 | 10.1103/PhysRevD.78.064020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We expand upon our previous analysis of numerical moving-puncture simulations
of the Schwarzschild spacetime. We present a derivation of the family of
analytic stationary 1+log foliations of the Schwarzschild solution, and outline
a transformation to isotropic-like coordinates. We discuss in detail the
numerical evol... | [
{
"created": "Thu, 3 Apr 2008 21:42:23 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Apr 2008 13:42:32 GMT",
"version": "v2"
}
] | 2009-02-20 | [
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Ohme",
"Frank",
""
],
[
"Bruegmann",
"Bernd",
""
],
[
"O'Murchadha",
"Niall",
""
]
] | We expand upon our previous analysis of numerical moving-puncture simulations of the Schwarzschild spacetime. We present a derivation of the family of analytic stationary 1+log foliations of the Schwarzschild solution, and outline a transformation to isotropic-like coordinates. We discuss in detail the numerical evolut... |
0812.2581 | Massimo Tinto | Massimo Tinto, George J. Dick, John D. Prestage, and J.W. Armstrong | Improved spacecraft radio science using an on-board atomic clock:
application to gravitational wave searches | 21 pages, 5 figures. Submitted to Phys. Rev. D | Phys.Rev.D79:102003,2009 | 10.1103/PhysRevD.79.102003 | null | gr-qc | http://creativecommons.org/licenses/publicdomain/ | Recent advances in space-qualified atomic clocks (low-mass, low
power-consumption, frequency stability comparable to that of ground-based
clocks) can enable interplanetary spacecraft radio science experiments at
unprecedented Doppler sensitivities. The addition of an on-board digital
receiver would allow the up- and ... | [
{
"created": "Sat, 13 Dec 2008 20:33:33 GMT",
"version": "v1"
}
] | 2010-04-15 | [
[
"Tinto",
"Massimo",
""
],
[
"Dick",
"George J.",
""
],
[
"Prestage",
"John D.",
""
],
[
"Armstrong",
"J. W.",
""
]
] | Recent advances in space-qualified atomic clocks (low-mass, low power-consumption, frequency stability comparable to that of ground-based clocks) can enable interplanetary spacecraft radio science experiments at unprecedented Doppler sensitivities. The addition of an on-board digital receiver would allow the up- and do... |
1209.2680 | Ahmadjon Abdujabbarov | Ahmadjon Abdujabbarov, Arman Tursunov, Bobomurat Ahmedov, and Abdulla
Kuvatov | Acceleration of particles by black hole with gravitomagnetic charge
immersed in magnetic field | 8 pages,7 figures, 1 table, Accepted for publication in Astrophysics
& Space Science | null | 10.1007/s10509-012-1251-y | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The collision of test charged particles in the vicinity of an event horizon
of a weakly magnetized non-rotating black hole with gravitomagnetic charge has
been studied. The presence of the external magnetic field decreases the
innermost stable circular orbits (ISCO) radii of charged particles. The
opposite mechanism ... | [
{
"created": "Wed, 12 Sep 2012 18:16:57 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Dec 2013 10:20:40 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Tursunov",
"Arman",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Kuvatov",
"Abdulla",
""
]
] | The collision of test charged particles in the vicinity of an event horizon of a weakly magnetized non-rotating black hole with gravitomagnetic charge has been studied. The presence of the external magnetic field decreases the innermost stable circular orbits (ISCO) radii of charged particles. The opposite mechanism oc... |
1701.01039 | Behzad Eslam Panah | S. H. Hendi, G. H. Bordbar, B. Eslam Panah and S. Panahiyan | Neutron stars structure in the context of massive gravity | 17 pages, 6 figures | JCAP 07 (2017) 004 | 10.1088/1475-7516/2017/07/004 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent interests in spin$-2$ massive gravitons, we study the
structure of neutron star in the context of massive gravity. The modifications
of TOV equation in the presence of massive gravity are explored in $4$ and
higher dimensions. Next, by considering the modern equation of state for the
neutron s... | [
{
"created": "Sun, 1 Jan 2017 17:29:10 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jul 2017 10:41:03 GMT",
"version": "v2"
}
] | 2017-07-25 | [
[
"Hendi",
"S. H.",
""
],
[
"Bordbar",
"G. H.",
""
],
[
"Panah",
"B. Eslam",
""
],
[
"Panahiyan",
"S.",
""
]
] | Motivated by the recent interests in spin$-2$ massive gravitons, we study the structure of neutron star in the context of massive gravity. The modifications of TOV equation in the presence of massive gravity are explored in $4$ and higher dimensions. Next, by considering the modern equation of state for the neutron sta... |
2212.14843 | Orest Hrycyna | Orest Hrycyna | On the structural stability of a simple cosmological model in $R+\alpha
R^{2}$ theory of gravity | 18 pages, 3 figs | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theory of gravity with a quadratic contribution of scalar curvature is
investigated in terms of dynamical system approach. The simplest
Friedmann-Robertson-Walker metric is used to formulate dynamics in Jordan frame
as well as in conformally transformed Einstein frame. We show that in both
frames there are stable de ... | [
{
"created": "Fri, 30 Dec 2022 17:42:18 GMT",
"version": "v1"
}
] | 2023-01-02 | [
[
"Hrycyna",
"Orest",
""
]
] | Theory of gravity with a quadratic contribution of scalar curvature is investigated in terms of dynamical system approach. The simplest Friedmann-Robertson-Walker metric is used to formulate dynamics in Jordan frame as well as in conformally transformed Einstein frame. We show that in both frames there are stable de Si... |
2206.05064 | Pasquale Bosso | Pasquale Bosso, Luciano Petruzziello, Fabian Wagner | The minimal length is physical | 4 pages, 1 figure | Phys. Lett. 843 (2022) 137415 | 10.1016/j.physletb.2022.137415 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we clarify a foundational loose end affecting the
phenomenological approach to quantum gravity centered around the generalization
of Heisenberg uncertainty principle. This misconception stems from a series of
recently published works in which perturbative and non-perturbative methods are
confused, ther... | [
{
"created": "Thu, 9 Jun 2022 17:32:22 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Bosso",
"Pasquale",
""
],
[
"Petruzziello",
"Luciano",
""
],
[
"Wagner",
"Fabian",
""
]
] | In this paper, we clarify a foundational loose end affecting the phenomenological approach to quantum gravity centered around the generalization of Heisenberg uncertainty principle. This misconception stems from a series of recently published works in which perturbative and non-perturbative methods are confused, thereb... |
2012.10462 | Baofei Li | Bao-Fei Li, Sahil Saini, Parampreet Singh | Primordial power spectrum from a matter-Ekpyrotic bounce scenario in
loop quantum cosmology | 20 pages, 8 figures, 1 table | Phys. Rev. D 103, 066020 (2021) | 10.1103/PhysRevD.103.066020 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A union of matter bounce and Ekpyrotic scenarios is often studied in an
attempt to combine the most promising features of these two models. Since
non-perturbative quantum geometric effects in loop quantum cosmology (LQC)
result in natural bouncing scenarios without any violation of energy conditions
or fine tuning, a... | [
{
"created": "Fri, 18 Dec 2020 19:00:26 GMT",
"version": "v1"
}
] | 2021-03-31 | [
[
"Li",
"Bao-Fei",
""
],
[
"Saini",
"Sahil",
""
],
[
"Singh",
"Parampreet",
""
]
] | A union of matter bounce and Ekpyrotic scenarios is often studied in an attempt to combine the most promising features of these two models. Since non-perturbative quantum geometric effects in loop quantum cosmology (LQC) result in natural bouncing scenarios without any violation of energy conditions or fine tuning, an ... |
gr-qc/0401096 | Matteo Luca Ruggiero | Angelo Tartaglia, Matteo Luca Ruggiero | The Gravitomagnetic measurement of the angular momentum of celestial
bodies | 4 pages, LaTeX, submitted to the Proceedings of the "X Marcel
Grossmann Meeting on General Relativity" in Rio de Janeiro, Brazil, July
20-26 (2003) | null | 10.1142/9789812704030_0230 | null | gr-qc astro-ph | null | The asymmetry in the time delay for light rays propagating on opposite sides
of a spinning body is analyzed. A frequency shift in the perceived signals is
found. A practical procedure is proposed for evidencing the asymmetry, allowing
for a measurement of the specific angular momentum of the rotating mass. Orders
of ... | [
{
"created": "Thu, 22 Jan 2004 12:52:20 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Tartaglia",
"Angelo",
""
],
[
"Ruggiero",
"Matteo Luca",
""
]
] | The asymmetry in the time delay for light rays propagating on opposite sides of a spinning body is analyzed. A frequency shift in the perceived signals is found. A practical procedure is proposed for evidencing the asymmetry, allowing for a measurement of the specific angular momentum of the rotating mass. Orders of ma... |
gr-qc/0611004 | Shahar Hod | Shahar Hod | Universal Bound on Dynamical Relaxation Times and Black-Hole Quasinormal
Ringing | 4 pages | Phys.Rev.D75:064013,2007 | 10.1103/PhysRevD.75.064013 | null | gr-qc astro-ph cond-mat.stat-mech hep-th nucl-th quant-ph | null | From information theory and thermodynamic considerations a universal bound on
the relaxation time $\tau$ of a perturbed system is inferred, $\tau \geq
\hbar/\pi T$, where $T$ is the system's temperature. We prove that black holes
comply with the bound; in fact they actually {\it saturate} it. Thus, when
judged by the... | [
{
"created": "Wed, 1 Nov 2006 06:43:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hod",
"Shahar",
""
]
] | From information theory and thermodynamic considerations a universal bound on the relaxation time $\tau$ of a perturbed system is inferred, $\tau \geq \hbar/\pi T$, where $T$ is the system's temperature. We prove that black holes comply with the bound; in fact they actually {\it saturate} it. Thus, when judged by their... |
1505.05509 | Vitor Cardoso | Vitor Cardoso, Richard Brito, Joao L. Rosa | Superradiance in stars | 5 pages, RevTex 4. Accepted for publication in Physical Review D | Phys.Rev. D91 (2015) 12, 124026 | 10.1103/PhysRevD.91.124026 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has long been known that dissipation is a crucial ingredient in the
superradiant amplification of wavepackets off rotating objects. We show that,
once appropriate dissipation mechanisms are included, stars are also prone to
superradiance and superradiant instabilities. In particular, ultra-light dark
matter with s... | [
{
"created": "Wed, 20 May 2015 20:00:35 GMT",
"version": "v1"
}
] | 2015-07-03 | [
[
"Cardoso",
"Vitor",
""
],
[
"Brito",
"Richard",
""
],
[
"Rosa",
"Joao L.",
""
]
] | It has long been known that dissipation is a crucial ingredient in the superradiant amplification of wavepackets off rotating objects. We show that, once appropriate dissipation mechanisms are included, stars are also prone to superradiance and superradiant instabilities. In particular, ultra-light dark matter with sma... |
2401.02924 | Jose Barrientos | Jos\'e Barrientos, Adolfo Cisterna, Ivan Kol\'a\v{r}, Keanu M\"uller,
Marcelo Oyarzo, and Konstantinos Pallikaris | Mixing "Magnetic'' and "Electric'' Ehlers--Harrison transformations: The
Electromagnetic Swirling Spacetime and Novel Type I Backgrounds | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we obtain a complete list of stationary and axisymmetric
spacetimes, generated from a Minkowski spacetime using the Ernst technique. We
do so by operating on the associated seed potentials with a composition of
Ehlers and Harrison transformations. In particular, assigning an additional
``electric'' or ... | [
{
"created": "Fri, 5 Jan 2024 18:05:53 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2024 18:16:19 GMT",
"version": "v2"
}
] | 2024-01-15 | [
[
"Barrientos",
"José",
""
],
[
"Cisterna",
"Adolfo",
""
],
[
"Kolář",
"Ivan",
""
],
[
"Müller",
"Keanu",
""
],
[
"Oyarzo",
"Marcelo",
""
],
[
"Pallikaris",
"Konstantinos",
""
]
] | In this paper, we obtain a complete list of stationary and axisymmetric spacetimes, generated from a Minkowski spacetime using the Ernst technique. We do so by operating on the associated seed potentials with a composition of Ehlers and Harrison transformations. In particular, assigning an additional ``electric'' or ``... |
gr-qc/0307092 | Nobuyuki Sakai | Nobuyuki Sakai (Yamagata U./Rome Observatory) | Generality of Topological Inflation | 11 pages, details of numerical method described, discussions added,
to appear in CQG | Class.Quant.Grav. 21 (2004) 281-288 | 10.1088/0264-9381/21/1/020 | null | gr-qc astro-ph hep-ph | null | Many authors claimed that a large initial inhomogeneity prevents the onset of
inflation and therefore inflation takes place only if the scalar field is
homogeneous or appropriately chosen over the horizon scale. We show that those
arguments do not apply to topological inflation. The core of a defect starts
inflation ... | [
{
"created": "Mon, 21 Jul 2003 14:14:23 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 2003 18:29:39 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Sakai",
"Nobuyuki",
"",
"Yamagata U./Rome Observatory"
]
] | Many authors claimed that a large initial inhomogeneity prevents the onset of inflation and therefore inflation takes place only if the scalar field is homogeneous or appropriately chosen over the horizon scale. We show that those arguments do not apply to topological inflation. The core of a defect starts inflation ev... |
2405.16758 | Kristian Gjorgjieski | Kristian Gjorgjieski and Rog\'erio Capobianco | Geometrically Thick Disks around Kerr Black Holes in a Swirling Universe | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate geometrically thick disks around Kerr black holes in a
swirling universe. This stationary and axisymmetric spacetime is composed of a
Kerr black hole, which is immersed in a swirling background. The swirling
background is characterized by an odd $\mathcal{Z}_2$ symmetry, where the
northern and southern... | [
{
"created": "Mon, 27 May 2024 02:05:50 GMT",
"version": "v1"
}
] | 2024-05-28 | [
[
"Gjorgjieski",
"Kristian",
""
],
[
"Capobianco",
"Rogério",
""
]
] | We investigate geometrically thick disks around Kerr black holes in a swirling universe. This stationary and axisymmetric spacetime is composed of a Kerr black hole, which is immersed in a swirling background. The swirling background is characterized by an odd $\mathcal{Z}_2$ symmetry, where the northern and southern h... |
2301.03522 | Galina Weinstein Dr | Galina Weinstein | The Neverending Story of the Eternal Wormhole and the Noisy Sycamore | null | null | null | null | gr-qc hep-th physics.hist-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | There has been a great buzz surrounding Daniel Jafferis et al.'s latest
Nature paper, "Traversable wormhole dynamics on a quantum processor". The
Nature paper discusses an experiment in which Google's Sycamore quantum
processor is used to simulate a sparse N = 7 SYK model with 5 terms (a learned
Hamiltonian). The Nat... | [
{
"created": "Mon, 9 Jan 2023 17:19:19 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jan 2023 17:51:29 GMT",
"version": "v2"
},
{
"created": "Thu, 18 May 2023 15:52:33 GMT",
"version": "v3"
}
] | 2023-05-19 | [
[
"Weinstein",
"Galina",
""
]
] | There has been a great buzz surrounding Daniel Jafferis et al.'s latest Nature paper, "Traversable wormhole dynamics on a quantum processor". The Nature paper discusses an experiment in which Google's Sycamore quantum processor is used to simulate a sparse N = 7 SYK model with 5 terms (a learned Hamiltonian). The Natur... |
gr-qc/9909079 | Hugo A. Morales-Tecotl | Jorge Alfaro (PUC/Santiago), Hugo A. Morales-Tecotl (UAM-I/Mexico
City) and Luis F. Urrutia (ICN-UNAM/Mexico City) | Quantum gravity corrections to neutrino propagation | RevTeX, 5pp, no figures. Notation of a sum in Eq.(2) improved. Slight
modifications in redaction. Final version to appear in Phys. Rev. Lett | Phys.Rev.Lett.84:2318-2321,2000 | 10.1103/PhysRevLett.84.2318 | null | gr-qc astro-ph hep-ph hep-th | null | Massive spin-1/2 fields are studied in the framework of loop quantum gravity
by considering a state approximating, at a length scale $\cal L$ much greater
than Planck length $\ell_P=1.2\times 10^{-33}$cm, a spin-1/2 field in flat
spacetime. The discrete structure of spacetime at $\ell_P$ yields corrections
to the fie... | [
{
"created": "Fri, 24 Sep 1999 23:44:16 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2000 17:19:55 GMT",
"version": "v2"
}
] | 2011-05-05 | [
[
"Alfaro",
"Jorge",
"",
"PUC/Santiago"
],
[
"Morales-Tecotl",
"Hugo A.",
"",
"UAM-I/Mexico\n City"
],
[
"Urrutia",
"Luis F.",
"",
"ICN-UNAM/Mexico City"
]
] | Massive spin-1/2 fields are studied in the framework of loop quantum gravity by considering a state approximating, at a length scale $\cal L$ much greater than Planck length $\ell_P=1.2\times 10^{-33}$cm, a spin-1/2 field in flat spacetime. The discrete structure of spacetime at $\ell_P$ yields corrections to the field... |
1012.5111 | Jonathan R. Gair | Jonathan R. Gair, Eanna E. Flanagan, Steve Drasco, Tanja Hinderer and
Stanislav Babak | Forced motion near black holes | 28 pages, 2 figures, submitted to Phys. Rev. D; v2 has minor changes
for consistency with published version, plus a new section discussing the
relative advantages of the two approaches | Phys.Rev.D83:044037,2011 | 10.1103/PhysRevD.83.044037 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present two methods for integrating forced geodesic equations in the Kerr
spacetime, which can accommodate arbitrary forces. As a test case, we compute
inspirals under a simple drag force, mimicking the presence of gas. We verify
that both methods give the same results for this simple force. We find that
drag gene... | [
{
"created": "Wed, 22 Dec 2010 21:37:54 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2011 18:07:54 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Gair",
"Jonathan R.",
""
],
[
"Flanagan",
"Eanna E.",
""
],
[
"Drasco",
"Steve",
""
],
[
"Hinderer",
"Tanja",
""
],
[
"Babak",
"Stanislav",
""
]
] | We present two methods for integrating forced geodesic equations in the Kerr spacetime, which can accommodate arbitrary forces. As a test case, we compute inspirals under a simple drag force, mimicking the presence of gas. We verify that both methods give the same results for this simple force. We find that drag genera... |
gr-qc/9411050 | Serge Droz | A. Bonanno, S. Droz, W.Israel and S.M. Morsink | Structure of the Spherical Black Hole Interior | 11 pages, latex, 2 figures | null | 10.1098/rspa.1995.0100 | Alberta-Thy-35-94 | gr-qc | null | The internal structure of a charged spherical black hole is still a topic of
debate. In a nonrotating but aspherical gravitational collapse to form a
spherical charged black hole, the backscattered gravitational wave tails enter
the black hole and are blueshifted at the Cauchy horizon. This has a
catastrophic effect ... | [
{
"created": "Fri, 18 Nov 1994 21:43:23 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"Bonanno",
"A.",
""
],
[
"Droz",
"S.",
""
],
[
"Israel",
"W.",
""
],
[
"Morsink",
"S. M.",
""
]
] | The internal structure of a charged spherical black hole is still a topic of debate. In a nonrotating but aspherical gravitational collapse to form a spherical charged black hole, the backscattered gravitational wave tails enter the black hole and are blueshifted at the Cauchy horizon. This has a catastrophic effect if... |
1405.3938 | Dario Bettoni | Dario Bettoni | Disformal invariance of second order scalar-tensor theories | 3 pages, to appear in the proceedings of the conference "Rencontres
de Moriond", Cosmology Session, 2014 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Horndeski action is the most general one involving a metric and a scalar
field that leads to second-order field equations in four dimensions. Being the
natural extension of the well-known scalar-tensor theories, its structure and
properties are worth analyzing along the experience accumulated in the latter
contex... | [
{
"created": "Mon, 12 May 2014 13:38:03 GMT",
"version": "v1"
}
] | 2014-05-16 | [
[
"Bettoni",
"Dario",
""
]
] | The Horndeski action is the most general one involving a metric and a scalar field that leads to second-order field equations in four dimensions. Being the natural extension of the well-known scalar-tensor theories, its structure and properties are worth analyzing along the experience accumulated in the latter context.... |
2004.10111 | Tanmoy Paul | Tanmoy Paul and Narayan Banerjee | Cosmological quantum entanglement : A possible testbed for the existence
of Kalb-Ramond field | CQG accepted | null | 10.1088/1361-6382/ab8bb9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper, we explore the possible effects of a second rank
antisymmetric tensor field, known as Kalb-Ramond (KR) field, on cosmological
particle production as well as on quantum entanglement for a massive scalar
field propagating in a four dimensional FRW spacetime evolves through a
symmetric bounce. For ... | [
{
"created": "Tue, 21 Apr 2020 15:39:00 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Paul",
"Tanmoy",
""
],
[
"Banerjee",
"Narayan",
""
]
] | In the present paper, we explore the possible effects of a second rank antisymmetric tensor field, known as Kalb-Ramond (KR) field, on cosmological particle production as well as on quantum entanglement for a massive scalar field propagating in a four dimensional FRW spacetime evolves through a symmetric bounce. For th... |
1602.04021 | Paolo Valtancoli | P. Valtancoli | Scalar field conformally coupled to a charged BTZ black hole | 9 pages, no figures | null | 10.1016/j.aop.2016.03.013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Klein-Gordon equation of a scalar field conformally coupled to a
charged BTZ black hole. The background metric is obtained by coupling a
non-linear and conformal invariant Maxwell field to (2+1) gravity. We show that
the radial part is generally solved by a Heun function and, in the pure gravity
limit, b... | [
{
"created": "Fri, 12 Feb 2016 11:46:19 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Valtancoli",
"P.",
""
]
] | We study the Klein-Gordon equation of a scalar field conformally coupled to a charged BTZ black hole. The background metric is obtained by coupling a non-linear and conformal invariant Maxwell field to (2+1) gravity. We show that the radial part is generally solved by a Heun function and, in the pure gravity limit, by ... |
2101.12570 | Dan Vollick | Dan N. Vollick | On the Meaning of Various Mass Definitions for Asymptotically Flat
Spacetimes | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The mass contained in an arbitrary spacetime in general relativity is not
well defined. However, for asymptotically flat spacetimes various definitions
of mass have been proposed. In this paper I consider eight masses and show that
some of them correspond to the active gravitational mass while the others
correspond t... | [
{
"created": "Thu, 28 Jan 2021 17:48:40 GMT",
"version": "v1"
}
] | 2021-02-01 | [
[
"Vollick",
"Dan N.",
""
]
] | The mass contained in an arbitrary spacetime in general relativity is not well defined. However, for asymptotically flat spacetimes various definitions of mass have been proposed. In this paper I consider eight masses and show that some of them correspond to the active gravitational mass while the others correspond to ... |
1610.04742 | Benjamin Lackey | Benjamin D. Lackey, Sebastiano Bernuzzi, Chad R. Galley, Jeroen
Meidam, Chris Van Den Broeck | Effective-one-body waveforms for binary neutron stars using surrogate
models | 17 pages, 11 figures, submitted to PRD | Phys. Rev. D 95, 104036 (2017) | 10.1103/PhysRevD.95.104036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave observations of binary neutron star systems can provide
information about the masses, spins, and structure of neutron stars. However,
this requires accurate and computationally efficient waveform models that take
<1s to evaluate for use in Bayesian parameter estimation codes that perform
10^7 - 10^... | [
{
"created": "Sat, 15 Oct 2016 14:27:31 GMT",
"version": "v1"
}
] | 2017-06-07 | [
[
"Lackey",
"Benjamin D.",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Galley",
"Chad R.",
""
],
[
"Meidam",
"Jeroen",
""
],
[
"Broeck",
"Chris Van Den",
""
]
] | Gravitational-wave observations of binary neutron star systems can provide information about the masses, spins, and structure of neutron stars. However, this requires accurate and computationally efficient waveform models that take <1s to evaluate for use in Bayesian parameter estimation codes that perform 10^7 - 10^8 ... |
0812.4856 | Alberto Rozas-Fernandez | Norman Cruz, Pedro F. Gonzalez-Diaz, Alberto Rozas-Fernandez and
Guillermo Sanchez | Holographic kinetic k-essence model | 6 pages, 4 figures, revised version, accepted for publication in
Phys.Lett.B | Phys.Lett.B679:293-297,2009 | 10.1016/j.physletb.2009.07.028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a connection between the holographic dark energy density and the
kinetic k-essence energy density in a flat FRW universe. With the choice
$c\geq1$, the holographic dark energy can be described by a kinetic k-essence
scalar field in a certain way. In this paper we show this kinetic k-essential
description ... | [
{
"created": "Sun, 28 Dec 2008 21:53:39 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Aug 2009 13:07:32 GMT",
"version": "v2"
}
] | 2009-09-28 | [
[
"Cruz",
"Norman",
""
],
[
"Gonzalez-Diaz",
"Pedro F.",
""
],
[
"Rozas-Fernandez",
"Alberto",
""
],
[
"Sanchez",
"Guillermo",
""
]
] | We consider a connection between the holographic dark energy density and the kinetic k-essence energy density in a flat FRW universe. With the choice $c\geq1$, the holographic dark energy can be described by a kinetic k-essence scalar field in a certain way. In this paper we show this kinetic k-essential description of... |
1505.07017 | N\'estor Ortiz | N\'estor Ortiz, Olivier Sarbach, and Thomas Zannias | Shadow of a naked singularity | 26 pages, 11 figures | Phys. Rev. D 92, 044035 (2015) | 10.1103/PhysRevD.92.044035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the redshift suffered by photons originating from an external
source, traversing a collapsing dust cloud and finally being received by an
asymptotic observer. In addition, we study the shadow that the collapsing cloud
casts on the sky of the asymptotic observer. We find that the resulting
redshift and prop... | [
{
"created": "Tue, 26 May 2015 15:42:49 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2015 14:06:53 GMT",
"version": "v2"
}
] | 2015-09-10 | [
[
"Ortiz",
"Néstor",
""
],
[
"Sarbach",
"Olivier",
""
],
[
"Zannias",
"Thomas",
""
]
] | We analyze the redshift suffered by photons originating from an external source, traversing a collapsing dust cloud and finally being received by an asymptotic observer. In addition, we study the shadow that the collapsing cloud casts on the sky of the asymptotic observer. We find that the resulting redshift and proper... |
gr-qc/0210009 | Mauricio Bellini | Mauricio Bellini (IFM, Michoacana University) | Fresh inflation from five-dimensional vacuum state | 8 pages, 1 figure - to appear in Gen. Rel. Grav | Gen.Rel.Grav. 35 (2003) 35-41 | 10.1023/A:1021398710545 | null | gr-qc hep-ph | null | I study fresh inflation from a five-dimensional vacuum state, where the fifth
dimension is constant. In this framework, the universe can be seen as inflating
in a four-dimensional FRW metric embedding in a five-dimensional metric.
Finally, the experimental data $n_s=1$ are consistent with $(p+\rho_t)/\rho_t
\simeq1/3... | [
{
"created": "Wed, 2 Oct 2002 17:23:29 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Bellini",
"Mauricio",
"",
"IFM, Michoacana University"
]
] | I study fresh inflation from a five-dimensional vacuum state, where the fifth dimension is constant. In this framework, the universe can be seen as inflating in a four-dimensional FRW metric embedding in a five-dimensional metric. Finally, the experimental data $n_s=1$ are consistent with $(p+\rho_t)/\rho_t \simeq1/3$ ... |
1801.09972 | Ian Harry | Ian Harry, Tanja Hinderer | Observing and measuring the neutron-star equation-of-state in spinning
binary neutron star systems | 29 pages (CQG formatting), 9 figures | null | 10.1088/1361-6382/aac7e3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LIGO and Virgo recently observed the first binary neutron star merger,
demonstrating that gravitational-waves offer the ability to probe how matter
behaves in one of the most extreme environments in the Universe. However, the
gravitational-wave signal emitted by an inspiraling binary neutron star system
is only weakl... | [
{
"created": "Tue, 30 Jan 2018 13:14:39 GMT",
"version": "v1"
}
] | 2018-07-11 | [
[
"Harry",
"Ian",
""
],
[
"Hinderer",
"Tanja",
""
]
] | LIGO and Virgo recently observed the first binary neutron star merger, demonstrating that gravitational-waves offer the ability to probe how matter behaves in one of the most extreme environments in the Universe. However, the gravitational-wave signal emitted by an inspiraling binary neutron star system is only weakly ... |
2009.11994 | Sai Wang | Zhe Chang, Sai Wang, Qing-Hua Zhu | Gauge Invariant Second Order Gravitational Waves | Major revisions. We further analyze the relation between the gauge
invariant synchronous gravitational waves and the gravitational waves fixed
in the Newtonian gauge. In this way, we could explain why one obtained
correctly the energy density spectrum from the Newtonian gauge in previous
studies (our method is ... | null | null | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the gauge invariance of the second order gravitational waves
induced by the first order scalar perturbations by following the Lie derivative
method. It is shown explicitly that the second order gravitational waves are
gauge invariant in the synchronous frame. In the gauge invariant framework, we
derive... | [
{
"created": "Fri, 25 Sep 2020 01:38:27 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2020 08:42:23 GMT",
"version": "v2"
}
] | 2020-09-30 | [
[
"Chang",
"Zhe",
""
],
[
"Wang",
"Sai",
""
],
[
"Zhu",
"Qing-Hua",
""
]
] | We investigate the gauge invariance of the second order gravitational waves induced by the first order scalar perturbations by following the Lie derivative method. It is shown explicitly that the second order gravitational waves are gauge invariant in the synchronous frame. In the gauge invariant framework, we derive t... |
2111.09174 | Pu-Xin Lin | Pu-Xin Lin and Yun-Song Piao | Populating the landscape in an inhomogeneous universe | 11 pages + references and appendix, 8 figures | null | 10.1103/PhysRevD.105.063534 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The primordial Universe might be highly inhomogeneous. We perform the 3+1D
Numerical Relativity simulation for the evolution of scalar field in an initial
inhomogeneous expanding Universe, and investigate how it populates the
landscape with both de Sitter (dS) and AdS vacua. The simulation results show
that eventuall... | [
{
"created": "Wed, 17 Nov 2021 15:06:11 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 2022 18:53:43 GMT",
"version": "v2"
}
] | 2022-04-06 | [
[
"Lin",
"Pu-Xin",
""
],
[
"Piao",
"Yun-Song",
""
]
] | The primordial Universe might be highly inhomogeneous. We perform the 3+1D Numerical Relativity simulation for the evolution of scalar field in an initial inhomogeneous expanding Universe, and investigate how it populates the landscape with both de Sitter (dS) and AdS vacua. The simulation results show that eventually ... |
gr-qc/0206058 | Dzhunushaliev Vladimir | V. Dzhunushaliev | Time at the origin of the Universe: fluctuations between two
possibilities | talk given at the NATO ARW "The Nature of Time : Geometry, Physics
and perception", Tatranska Lomnica, Slovak Republic | null | null | null | gr-qc | null | A variation of Hawking's idea about Euclidean origin of a nonsingular birth
of the Universe is considered. It is assumed that near to zero moment $t = 0$
fluctuations of a metric signature are possible.
| [
{
"created": "Thu, 20 Jun 2002 02:34:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dzhunushaliev",
"V.",
""
]
] | A variation of Hawking's idea about Euclidean origin of a nonsingular birth of the Universe is considered. It is assumed that near to zero moment $t = 0$ fluctuations of a metric signature are possible. |
2203.11031 | Alesandro Santos | A. F. Santos and Faqir C. Khanna | Finite temperature applications in G\"odel space-time | 11 pages, accepted for publication in EPJC | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Temperature effects in a scalar field non-minimally coupled to gravity are
investigated. The Thermo Field Dynamics formalism is used. This is a
topological field theory that allows us to calculate different effects, such as
the Stefan-Boltzmann law and the Casimir effect, on an equal footing. These
phenomena are calc... | [
{
"created": "Mon, 21 Mar 2022 14:50:13 GMT",
"version": "v1"
}
] | 2022-03-22 | [
[
"Santos",
"A. F.",
""
],
[
"Khanna",
"Faqir C.",
""
]
] | Temperature effects in a scalar field non-minimally coupled to gravity are investigated. The Thermo Field Dynamics formalism is used. This is a topological field theory that allows us to calculate different effects, such as the Stefan-Boltzmann law and the Casimir effect, on an equal footing. These phenomena are calcul... |
2205.11036 | Silvia Vicentini | Silvia Vicentini | New bounds on vacuum decay in de Sitter space | 26 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vacuum decay in de Sitter space is a process of great physical interest, as
it allows to rule out cosmological models in the early and current Universe.
Its rate may be described in terms of an instanton in Euclidean space called
bounce and it is usually interpreted as thermally assisted quantum tunneling.
According ... | [
{
"created": "Mon, 23 May 2022 04:43:27 GMT",
"version": "v1"
}
] | 2022-05-24 | [
[
"Vicentini",
"Silvia",
""
]
] | Vacuum decay in de Sitter space is a process of great physical interest, as it allows to rule out cosmological models in the early and current Universe. Its rate may be described in terms of an instanton in Euclidean space called bounce and it is usually interpreted as thermally assisted quantum tunneling. According to... |
gr-qc/9707001 | null | S.Ansoldi, A.Aurilia, R.Balbinot, E.Spallucci | Effective dynamics of self-gravitating extended objects | 13 pages, no figures, ReVTeX | Phys.Essays 9 (1996) 556 | 10.4006/1.3029270 | null | gr-qc hep-th | null | We introduce an effective Lagrangian which describes the classical and
semiclassical dynamics of spherically symmetric, self-gravitating objects that
may populate the Universe at large and small (Planck) scale. These include
wormholes, black holes and inflationary bubbles. We speculate that such objects
represent som... | [
{
"created": "Tue, 1 Jul 1997 10:22:18 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Ansoldi",
"S.",
""
],
[
"Aurilia",
"A.",
""
],
[
"Balbinot",
"R.",
""
],
[
"Spallucci",
"E.",
""
]
] | We introduce an effective Lagrangian which describes the classical and semiclassical dynamics of spherically symmetric, self-gravitating objects that may populate the Universe at large and small (Planck) scale. These include wormholes, black holes and inflationary bubbles. We speculate that such objects represent some ... |
1810.10832 | Ayan Chatterjee | Ayan Chatterjee and Ankit Anand | Joining Spacetimes on Fractal Hypersurfaces | 22 pages, 2 figures | null | 10.1016/j.nuclphysb.2019.01.020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theory of fractional calculus is attracting a lot of attention from
mathematicians as well as physicists. The fractional generalisation of the
well-known ordinary calculus is being used extensively in many fields,
particularly in understanding stochastic process and fractal dynamics. In this
paper, we apply the t... | [
{
"created": "Thu, 25 Oct 2018 11:07:46 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Chatterjee",
"Ayan",
""
],
[
"Anand",
"Ankit",
""
]
] | The theory of fractional calculus is attracting a lot of attention from mathematicians as well as physicists. The fractional generalisation of the well-known ordinary calculus is being used extensively in many fields, particularly in understanding stochastic process and fractal dynamics. In this paper, we apply the tec... |
0905.3465 | Eduardo J.S. Villasenor | J. Fernando Barbero G., Jerzy Lewandowski, Eduardo J. S. Villase\~nor | Flux-area operator and black hole entropy | 25 pages | Phys.Rev.D80:044016,2009 | 10.1103/PhysRevD.80.044016 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, for space-times with inner boundaries, there exists a natural
area operator different from the standard one used in loop quantum gravity.
This new flux-area operator has equidistant eigenvalues. We discuss the
consequences of substituting the standard area operator in the
Ashtekar-Baez-Corichi-Krasnov d... | [
{
"created": "Thu, 21 May 2009 10:19:31 GMT",
"version": "v1"
}
] | 2009-08-19 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] | We show that, for space-times with inner boundaries, there exists a natural area operator different from the standard one used in loop quantum gravity. This new flux-area operator has equidistant eigenvalues. We discuss the consequences of substituting the standard area operator in the Ashtekar-Baez-Corichi-Krasnov def... |
1206.0022 | Marco Cariglia Dr | Marco Cariglia | Hidden symmetries of Eisenhart-Duval lift metrics and the Dirac equation
with flux | 18 pages, no figures. Version 3: some typos corrected, some
discussions clarified, part of the abstract changed | Phys. Rev. D 86, 084050 (2012) | 10.1103/PhysRevD.86.084050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Eisenhart-Duval lift allows embedding non-relativistic theories into a
Lorentzian geometrical setting. In this paper we study the lift from the point
of view of the Dirac equation and its hidden symmetries. We show that
dimensional reduction of the Dirac equation for the Eisenhart-Duval metric in
general gives ri... | [
{
"created": "Thu, 31 May 2012 20:19:08 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2012 03:58:05 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jun 2012 10:37:25 GMT",
"version": "v3"
}
] | 2012-12-07 | [
[
"Cariglia",
"Marco",
""
]
] | The Eisenhart-Duval lift allows embedding non-relativistic theories into a Lorentzian geometrical setting. In this paper we study the lift from the point of view of the Dirac equation and its hidden symmetries. We show that dimensional reduction of the Dirac equation for the Eisenhart-Duval metric in general gives rise... |
1501.04862 | Christian Corda Prof. | Subenoy Chakraborty, Subhajit Saha and Christian Corda | Quantum corrected non-thermal radiation spectrum from the tunnelling
mechanism | 9 pages, the results of arXiv:1305.4529 have been partially reviewed.
Final version accepted for publication in the Galaxies Special Issue
"Advances in Gravitational Research", Guest Editor Lorenzo Iorio | Galaxies 3, 103 (2015) | 10.3390/galaxies3020103 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tunnelling mechanism is today considered a popular and widely used method in
describing Hawking radiation. However, in relation to black hole (BH) emission,
this mechanism is mostly used to obtain the Hawking temperature by comparing
the probability of emission of an outgoing particle with the Boltzmann factor.
On th... | [
{
"created": "Fri, 16 Jan 2015 14:20:19 GMT",
"version": "v1"
},
{
"created": "Thu, 28 May 2015 12:22:30 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Saha",
"Subhajit",
""
],
[
"Corda",
"Christian",
""
]
] | Tunnelling mechanism is today considered a popular and widely used method in describing Hawking radiation. However, in relation to black hole (BH) emission, this mechanism is mostly used to obtain the Hawking temperature by comparing the probability of emission of an outgoing particle with the Boltzmann factor. On the ... |
0807.4109 | Keith Hall A | Ka Hall | Exact Results for the Kepler Problem in General Relativity | 7 pages, 0 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact results are derived, specifically the perihelion shift and the Kepler
orbit, for a bound test particle in the Schwarzschild metric with cosmological
constant $\Lambda=0$. A series expansion, of $\Delta\phi =
2(2(1-2M/p(3-e))^{-1/2} K((4eM/p)/(1-2M/p(3-e)))-\pi)$, the exact perihelion
shift, admits the standard ... | [
{
"created": "Fri, 25 Jul 2008 14:35:28 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jul 2008 18:13:35 GMT",
"version": "v2"
}
] | 2008-07-28 | [
[
"Hall",
"Ka",
""
]
] | Exact results are derived, specifically the perihelion shift and the Kepler orbit, for a bound test particle in the Schwarzschild metric with cosmological constant $\Lambda=0$. A series expansion, of $\Delta\phi = 2(2(1-2M/p(3-e))^{-1/2} K((4eM/p)/(1-2M/p(3-e)))-\pi)$, the exact perihelion shift, admits the standard ap... |
1506.02647 | Sumanta Chakraborty | Sumanta Chakraborty | Aspects of Neutrino Oscillation in Alternative Gravity Theories | v2, 36 Pages, 8 figures | JCAP 10(2015)019 | 10.1088/1475-7516/2015/10/019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino spin and flavour oscillation in curved spacetime have been studied
for the most general static spherically symmetric configuration. Using the
symmetry properties we have derived spin oscillation frequency for neutrino
moving along a geodesic or in a circular orbit. Starting from the expression of
neutrino sp... | [
{
"created": "Mon, 8 Jun 2015 03:49:01 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2015 11:10:37 GMT",
"version": "v2"
}
] | 2015-10-16 | [
[
"Chakraborty",
"Sumanta",
""
]
] | Neutrino spin and flavour oscillation in curved spacetime have been studied for the most general static spherically symmetric configuration. Using the symmetry properties we have derived spin oscillation frequency for neutrino moving along a geodesic or in a circular orbit. Starting from the expression of neutrino spin... |
gr-qc/0311014 | Tomohiro Harada | Tomohiro Harada and Hideki Maeda | Stability criterion for self-similar solutions with a scalar field and
those with a stiff fluid in general relativity | 15 pages, accepted for publication in Classical and Quantum Gravity,
typos corrected | Class.Quant.Grav. 21 (2004) 371-390 | 10.1088/0264-9381/21/2/003 | null | gr-qc astro-ph | null | A stability criterion is derived in general relativity for self-similar
solutions with a scalar field and those with a stiff fluid, which is a perfect
fluid with the equation of state $P=\rho$. A wide class of self-similar
solutions turn out to be unstable against kink mode perturbation. According to
the criterion, t... | [
{
"created": "Wed, 5 Nov 2003 14:24:08 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2003 12:06:46 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Dec 2003 10:17:13 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Harada",
"Tomohiro",
""
],
[
"Maeda",
"Hideki",
""
]
] | A stability criterion is derived in general relativity for self-similar solutions with a scalar field and those with a stiff fluid, which is a perfect fluid with the equation of state $P=\rho$. A wide class of self-similar solutions turn out to be unstable against kink mode perturbation. According to the criterion, the... |
2004.06604 | Jos\'e Domingo Vela Arba\~nil | Jos\'e D. V. Arba\~nil and Pedro H. R. S. Moraes | Stable relativistic polytropic objects with cosmological constant | 11 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of the cosmological constant on the static equilibrium
configurations and stability against small radial perturbations of relativistic
polytropic spheres are investigated. This study numerically solves the
hydrostatic equilibrium equation and the radial stability equation, both of
which are modified from ... | [
{
"created": "Tue, 14 Apr 2020 15:39:49 GMT",
"version": "v1"
}
] | 2020-04-15 | [
[
"Arbañil",
"José D. V.",
""
],
[
"Moraes",
"Pedro H. R. S.",
""
]
] | The effects of the cosmological constant on the static equilibrium configurations and stability against small radial perturbations of relativistic polytropic spheres are investigated. This study numerically solves the hydrostatic equilibrium equation and the radial stability equation, both of which are modified from th... |
0912.2803 | Michael Edmund Tobar | Michael Edmund Tobar, Peter Wolf, Sebastien Bize, Giorgio Santarelli,
Victor Flambaum | Testing Local Lorentz and Position Invariance and Variation of
Fundamental Constants by searching the Derivative of the Comparison Frequency
Between a Cryogenic Sapphire Oscillator and Hydrogen Maser | Fixed typos | Phys.Rev.D81:022003,2010 | 10.1103/PhysRevD.81.022003 | null | gr-qc hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cryogenic sapphire oscillator (CSO) at the Paris Observatory has been
continuously compared to various Hydrogen Masers since 2001. The early data
sets were used to test Local Lorentz Invariance in the Robertson-Mansouri-Sexl
(RMS) framework by searching for sidereal modulations with respect to the
Cosmic Microwav... | [
{
"created": "Tue, 15 Dec 2009 06:07:48 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2009 09:50:58 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Tobar",
"Michael Edmund",
""
],
[
"Wolf",
"Peter",
""
],
[
"Bize",
"Sebastien",
""
],
[
"Santarelli",
"Giorgio",
""
],
[
"Flambaum",
"Victor",
""
]
] | The cryogenic sapphire oscillator (CSO) at the Paris Observatory has been continuously compared to various Hydrogen Masers since 2001. The early data sets were used to test Local Lorentz Invariance in the Robertson-Mansouri-Sexl (RMS) framework by searching for sidereal modulations with respect to the Cosmic Microwave ... |
0801.2883 | Roland Triay | Roland Triay (CPT), Henri-Hugues Fliche (LMMT) | Voids in the distribution of galaxies and the Cosmological constant | 4 pages, 1 figure | Prog.Theor.Phys.Suppl.172:40-43,2008 | 10.1143/PTPS.172.40 | CPT-P002-2008 | gr-qc astro-ph | null | With the motivation in mind to evaluate the contribution of the cosmological
constant $\Lambda$ on the foam like patterns formation process in the
distribution of galaxies, we investigate the Newtonian dynamics of a spherical
void embedded in an uniform medium which undergoes a Hubble expansion. We use a
covariant ap... | [
{
"created": "Fri, 18 Jan 2008 13:37:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Triay",
"Roland",
"",
"CPT"
],
[
"Fliche",
"Henri-Hugues",
"",
"LMMT"
]
] | With the motivation in mind to evaluate the contribution of the cosmological constant $\Lambda$ on the foam like patterns formation process in the distribution of galaxies, we investigate the Newtonian dynamics of a spherical void embedded in an uniform medium which undergoes a Hubble expansion. We use a covariant appr... |
1502.02833 | Grasiele Batista Santos | Grasiele Santos, Giulia Gubitosi and Giovanni Amelino-Camelia | On the initial singularity problem in rainbow cosmology | v3: typo in Eq. (9) corrected, results unchanged. 10 pages, 5
figures, v2 matches published version | JCAP 08 (2015) 005 | 10.1088/1475-7516/2015/08/005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently claimed that the initial singularity might be avoided in
the context of rainbow cosmology, where one attempts to account for
quantum-gravitational corrections through an effective-theory description based
on an energy-dependent ("rainbow") space-time metric. We here scrutinize this
exciting hypot... | [
{
"created": "Tue, 10 Feb 2015 10:05:48 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 2015 15:32:02 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Mar 2016 17:43:52 GMT",
"version": "v3"
}
] | 2016-03-22 | [
[
"Santos",
"Grasiele",
""
],
[
"Gubitosi",
"Giulia",
""
],
[
"Amelino-Camelia",
"Giovanni",
""
]
] | It has been recently claimed that the initial singularity might be avoided in the context of rainbow cosmology, where one attempts to account for quantum-gravitational corrections through an effective-theory description based on an energy-dependent ("rainbow") space-time metric. We here scrutinize this exciting hypothe... |
2310.11576 | Dennis Philipp | Dennis Philipp, Eva Hackmann, Jan P. Hackstein, Claus L\"ammerzahl | General Relativistic Chronometry with Clocks on Ground and in Space | 15 pages, 4 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | One of geodesy's main tasks is to determine the gravity field of the Earth.
High precision clocks have the potential to provide a new tool in a global
determination of the Earth's gravitational potential based on the gravitational
redshift. Towards this clock-based gravimetry or chronometry in stationary
spacetimes, ... | [
{
"created": "Tue, 17 Oct 2023 20:54:59 GMT",
"version": "v1"
}
] | 2023-10-19 | [
[
"Philipp",
"Dennis",
""
],
[
"Hackmann",
"Eva",
""
],
[
"Hackstein",
"Jan P.",
""
],
[
"Lämmerzahl",
"Claus",
""
]
] | One of geodesy's main tasks is to determine the gravity field of the Earth. High precision clocks have the potential to provide a new tool in a global determination of the Earth's gravitational potential based on the gravitational redshift. Towards this clock-based gravimetry or chronometry in stationary spacetimes, ex... |
gr-qc/0612134 | Grigory Volovik | G.E. Volovik | From Quantum Hydrodynamics to Quantum Gravity | 20 pages, 1 figure, rapporteur article for Proceedings of MG11,
session `Analog Models of and for General Relativity', references added | Proceedings of the Eleventh Marcel Grossmann Meeting on General
Relativity, edited by H. Kleinert, R.T. Jantzen and R. Ruffini, World
Scientific, Singapore, 2008, pp. 1404-1423 | null | null | gr-qc cond-mat.soft hep-ph | null | We discuss some lessons from quantum hydrodynamics to quantum gravity.
| [
{
"created": "Thu, 21 Dec 2006 14:22:42 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Dec 2006 18:49:55 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Dec 2006 14:21:41 GMT",
"version": "v3"
},
{
"created": "Sun, 31 Dec 2006 12:53:51 GMT",
"version": "v4"
},
{
"c... | 2008-07-12 | [
[
"Volovik",
"G. E.",
""
]
] | We discuss some lessons from quantum hydrodynamics to quantum gravity. |
gr-qc/0512066 | Volker Perlick | Volker Perlick | On totally umbilic submanifolds of semi-Riemannian manifolds | 7 pages; written version of talk given at World Congress on Nonlinear
Analysis 2004, Orlando, Florida | Nonlinear Analysis 63/5-7 (2005) e511-e518 | null | null | gr-qc | null | The notion of being totally umbilic is considered for non-degenerate and
degenerate submanifolds of semi-Riemanian manifolds. After some remarks on the
general case, timelike and lightlike totally umbilic submanifolds of Lorentzian
manifolds are discussed, along with their physical interpretation in view of
general r... | [
{
"created": "Sun, 11 Dec 2005 21:57:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Perlick",
"Volker",
""
]
] | The notion of being totally umbilic is considered for non-degenerate and degenerate submanifolds of semi-Riemanian manifolds. After some remarks on the general case, timelike and lightlike totally umbilic submanifolds of Lorentzian manifolds are discussed, along with their physical interpretation in view of general rel... |
2311.16775 | Artur Alho | Artur Alho, Claes Uggla, John Wainwright | Tracking Quintessence | 22 pages, 17 figures; v2: comments on previous dynamical systems
analysis of tracking quintessence added v3: References added | null | null | null | gr-qc astro-ph.CO math-ph math.DS math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tracking quintessence, in a spatially flat and isotropic space-time with a
minimally coupled canonical scalar field and an asymptotically inverse
power-law potential $V(\varphi)\propto\varphi^{-p}$, $p>0$, as
$\varphi\rightarrow0$, is investigated. This is done by introducing a new
three-dimensional \emph{regular} dy... | [
{
"created": "Tue, 28 Nov 2023 13:34:26 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2024 10:01:02 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Feb 2024 10:30:46 GMT",
"version": "v3"
}
] | 2024-02-06 | [
[
"Alho",
"Artur",
""
],
[
"Uggla",
"Claes",
""
],
[
"Wainwright",
"John",
""
]
] | Tracking quintessence, in a spatially flat and isotropic space-time with a minimally coupled canonical scalar field and an asymptotically inverse power-law potential $V(\varphi)\propto\varphi^{-p}$, $p>0$, as $\varphi\rightarrow0$, is investigated. This is done by introducing a new three-dimensional \emph{regular} dyna... |
gr-qc/0304019 | Marsha Weaver | James Isenberg and Marsha Weaver | On the area of the symmetry orbits in $T^2$ symmetric spacetimes | The appendix which appears in version 1 has a technical problem (the
inequality appearing as the first stage of (52) is not necessarily true), and
since the appendix is unnecessary for the proof of our results, we leave it
out. version 2 -- clarifications added, version 3 -- reference corrected | Class.Quant.Grav. 20 (2003) 3783-3796 | 10.1088/0264-9381/20/16/316 | null | gr-qc | null | We obtain a global existence result for the Einstein equations. We show that
in the maximal Cauchy development of vacuum $T^2$ symmetric initial data with
nonvanishing twist constant, except for the special case of flat Kasner initial
data, the area of the $T^2$ group orbits takes on all positive values. This
result ... | [
{
"created": "Fri, 4 Apr 2003 02:15:46 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jul 2003 06:15:02 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Feb 2004 05:21:30 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Isenberg",
"James",
""
],
[
"Weaver",
"Marsha",
""
]
] | We obtain a global existence result for the Einstein equations. We show that in the maximal Cauchy development of vacuum $T^2$ symmetric initial data with nonvanishing twist constant, except for the special case of flat Kasner initial data, the area of the $T^2$ group orbits takes on all positive values. This result sh... |
2304.03642 | Zhenyu Zhang | Zhenyu Zhang, Yehui Hou, Zezhou Hu, Minyong Guo, Bin Chen | Polarized images of charged particles in vortical motions around a
magnetized Kerr black hole | 25 pages, 8 figures | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | In this work, we study the images of a Kerr black hole (BH) immersed in
uniform magnetic fields, illuminated by the synchrotron radiation of charged
particles in the jet. We particularly focus on the spontaneously vortical
motions (SVMs) of charged particles in the jet region and investigate the
polarized images of e... | [
{
"created": "Fri, 7 Apr 2023 13:46:36 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2023 06:06:25 GMT",
"version": "v2"
}
] | 2023-11-15 | [
[
"Zhang",
"Zhenyu",
""
],
[
"Hou",
"Yehui",
""
],
[
"Hu",
"Zezhou",
""
],
[
"Guo",
"Minyong",
""
],
[
"Chen",
"Bin",
""
]
] | In this work, we study the images of a Kerr black hole (BH) immersed in uniform magnetic fields, illuminated by the synchrotron radiation of charged particles in the jet. We particularly focus on the spontaneously vortical motions (SVMs) of charged particles in the jet region and investigate the polarized images of ele... |
1810.08343 | Tiberiu Harko | Zolt\'an Kov\'acs, Tiberiu Harko, Shahab Shahidi | Reply to "Comment on 'Can accretion disk properties observationally
distinguish black holes from naked singularities?'" | 3 pages, no figures | Phys. Rev. D 98, 088502 (2018) | 10.1103/PhysRevD.98.088502 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Comment on "Can accretion disk properties observationally distinguish
black holes from naked singularities?", by Bertrand Chauvineau, Phys. Rev. D
{\bf 98}, 088501 (2018), the author did show that the metric used in Z.
Kov\'{a}cs and T. Harko, Phys. Rev. D {\bf 82}, 124047 (2010), and initially
introduced in K... | [
{
"created": "Fri, 19 Oct 2018 03:12:38 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Kovács",
"Zoltán",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Shahidi",
"Shahab",
""
]
] | In the Comment on "Can accretion disk properties observationally distinguish black holes from naked singularities?", by Bertrand Chauvineau, Phys. Rev. D {\bf 98}, 088501 (2018), the author did show that the metric used in Z. Kov\'{a}cs and T. Harko, Phys. Rev. D {\bf 82}, 124047 (2010), and initially introduced in K. ... |
1807.01791 | Richard Woodard | R. P. Woodard (Florida) | The Case for Nonlocal Modifications of Gravity | 30 pages, uses LaTeX 2e, to appear in the proceedings of the
International Conference on Quantum Gravity, SUST, March 26-28,2018 | null | null | UFIFT-QG-18-03 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The huge amounts of undetected and exotic dark matter and dark energy needed
to make general relativity work on large scales argue that we should
investigate modifications of gravity. The only stable, metric-based and
invariant alternative to general relativity is $f(R)$ models. These models can
explain primordial in... | [
{
"created": "Wed, 4 Jul 2018 21:34:50 GMT",
"version": "v1"
}
] | 2018-07-06 | [
[
"Woodard",
"R. P.",
"",
"Florida"
]
] | The huge amounts of undetected and exotic dark matter and dark energy needed to make general relativity work on large scales argue that we should investigate modifications of gravity. The only stable, metric-based and invariant alternative to general relativity is $f(R)$ models. These models can explain primordial infl... |
gr-qc/0110118 | Takeshi Chiba | Takeshi Chiba | Constancy of the Constants of Nature | 11 pages, based on a talk presented at "Frontier of Cosmology and
Gravitation" (YITP, Kyoto, April 25-27, 2001) | null | null | KUNS-1737 | gr-qc astro-ph hep-ph | null | The current observational and experimental bounds on time variation of the
constants of Nature are briefly reviewed.
| [
{
"created": "Sat, 27 Oct 2001 09:31:29 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Mar 2002 23:52:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chiba",
"Takeshi",
""
]
] | The current observational and experimental bounds on time variation of the constants of Nature are briefly reviewed. |
1401.5262 | Hal Haggard | Goffredo Chirco, Hal M. Haggard, Aldo Riello, Carlo Rovelli | Spacetime thermodynamics without hidden degrees of freedom | 12 pages, 1 figure | Phys. Rev. D 90, 044044 (2014) | 10.1103/PhysRevD.90.044044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A celebrated result by Jacobson is the derivation of Einstein's equations
from Unruh's temperature, the Bekenstein-Hawking entropy and the Clausius
relation. This has been repeatedly taken as evidence for an interpretation of
Einstein's equations as equations of state for unknown degrees of freedom
underlying the met... | [
{
"created": "Tue, 21 Jan 2014 11:04:36 GMT",
"version": "v1"
}
] | 2014-08-20 | [
[
"Chirco",
"Goffredo",
""
],
[
"Haggard",
"Hal M.",
""
],
[
"Riello",
"Aldo",
""
],
[
"Rovelli",
"Carlo",
""
]
] | A celebrated result by Jacobson is the derivation of Einstein's equations from Unruh's temperature, the Bekenstein-Hawking entropy and the Clausius relation. This has been repeatedly taken as evidence for an interpretation of Einstein's equations as equations of state for unknown degrees of freedom underlying the metri... |
2109.10932 | Maxime Van de Moortel | Maxime Van de Moortel | Violent nonlinear collapse in the interior of charged hairy black holes | Comments welcome! 38 pages, 4 figures | null | null | null | gr-qc hep-th math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a new one-parameter family indexed by $\epsilon$ of two-ended,
spatially-homogeneous black hole interiors solving the
Einstein-Maxwell-Klein-Gordon equations with a (possibly zero) cosmological
constant $\Lambda$ and bifurcating off a Reissner-Nordstr\"om-(dS/AdS) interior
($\epsilon = 0$). For all small... | [
{
"created": "Wed, 22 Sep 2021 18:01:08 GMT",
"version": "v1"
}
] | 2021-09-24 | [
[
"Van de Moortel",
"Maxime",
""
]
] | We construct a new one-parameter family indexed by $\epsilon$ of two-ended, spatially-homogeneous black hole interiors solving the Einstein-Maxwell-Klein-Gordon equations with a (possibly zero) cosmological constant $\Lambda$ and bifurcating off a Reissner-Nordstr\"om-(dS/AdS) interior ($\epsilon = 0$). For all small $... |
2008.04127 | Christian J. Kr\"uger | C. J. Kr\"uger, K. D. Kokkotas | Dynamics of Fast Rotating Neutron Stars: An Approach in the Hilbert
Gauge | 26 pages, 4 figures, revised version | null | 10.1103/PhysRevD.102.064026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a set of time evolution equations and its numerical
implementation for the investigation of non-axisymmetric oscillations of
rapidly rotating compact objects in full General Relativity, taking into
account the contribution of a dynamic spacetime. We derive the perturbation
equations for the spacetime in t... | [
{
"created": "Mon, 10 Aug 2020 13:39:25 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2020 11:33:44 GMT",
"version": "v2"
}
] | 2020-09-11 | [
[
"Krüger",
"C. J.",
""
],
[
"Kokkotas",
"K. D.",
""
]
] | We describe a set of time evolution equations and its numerical implementation for the investigation of non-axisymmetric oscillations of rapidly rotating compact objects in full General Relativity, taking into account the contribution of a dynamic spacetime. We derive the perturbation equations for the spacetime in the... |
gr-qc/0603020 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev | Thick brane solution in the presence of two interacting scalar fields | the program for numerical calculations is added | Grav.Cosmol.13:302-307,2007 | null | null | gr-qc hep-th | null | It is shown that two gravitating scalar fields may form a thick brane in 5D
spacetime. The necessary condition for the existence of such a regular solution
is that the scalar fields potential must have local and global minima.
| [
{
"created": "Wed, 8 Mar 2006 03:04:13 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Mar 2006 07:51:30 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Apr 2006 09:52:04 GMT",
"version": "v3"
},
{
"created": "Fri, 14 Apr 2006 03:07:55 GMT",
"version": "v4"
},
{
"cr... | 2008-11-26 | [
[
"Dzhunushaliev",
"Vladimir",
""
]
] | It is shown that two gravitating scalar fields may form a thick brane in 5D spacetime. The necessary condition for the existence of such a regular solution is that the scalar fields potential must have local and global minima. |
1504.05352 | Karim Noui KN | Aurelien Barrau, Xiangyu Cao, Karim Noui and Alejandro Perez | Black hole spectroscopy from Loop Quantum Gravity models | 11 pages, 9 figures | Phys. Rev. D 92, 124046 (2015) | 10.1103/PhysRevD.92.124046 | X11 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using Monte Carlo simulations, we compute the integrated emission spectra of
black holes in the framework of Loop Quantum Gravity (LQG). The black hole
emission rates are governed by the entropy whose value, in recent holographic
loop quantum gravity models, was shown to agree at leading order with the
Bekenstein-Haw... | [
{
"created": "Tue, 21 Apr 2015 09:33:31 GMT",
"version": "v1"
}
] | 2015-12-30 | [
[
"Barrau",
"Aurelien",
""
],
[
"Cao",
"Xiangyu",
""
],
[
"Noui",
"Karim",
""
],
[
"Perez",
"Alejandro",
""
]
] | Using Monte Carlo simulations, we compute the integrated emission spectra of black holes in the framework of Loop Quantum Gravity (LQG). The black hole emission rates are governed by the entropy whose value, in recent holographic loop quantum gravity models, was shown to agree at leading order with the Bekenstein-Hawki... |
2206.06963 | Kubantai Ernazarov | K.K. Ernazarov | Examples of exact exponential cosmological solutions with three
isotropic subspaces in the Einstein-Gauss-Bonnet gravity | 18 pages | null | 10.1134/S0202289322040090 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider $(1+ 8)$- and $(1+10)$-dimensional Einstein-Gauss-Bonnet models
with the cosmological $\Lambda$-term. Some new examples of exact solutions with
three constant Hubble-like parameters in this model are obtained, governed by
three non-coinciding Hubble-like parameters: $H \neq 0$, $h_1$ and $h_2$,
obeying $m... | [
{
"created": "Tue, 14 Jun 2022 16:33:43 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2022 07:52:58 GMT",
"version": "v2"
}
] | 2022-12-07 | [
[
"Ernazarov",
"K. K.",
""
]
] | We consider $(1+ 8)$- and $(1+10)$-dimensional Einstein-Gauss-Bonnet models with the cosmological $\Lambda$-term. Some new examples of exact solutions with three constant Hubble-like parameters in this model are obtained, governed by three non-coinciding Hubble-like parameters: $H \neq 0$, $h_1$ and $h_2$, obeying $m H... |
gr-qc/0203030 | Alessandra Buonanno | Alessandra Buonanno | Gravitational waves from inspiraling binary black holes | References added and updated; few typos corrected | Class.Quant.Grav. 19 (2002) 1267-1278 | 10.1088/0264-9381/19/7/305 | null | gr-qc | null | Binary black holes are the most promising candidate sources for the first
generation of earth-based interferometric gravitational-wave detectors. We
summarize and discuss the state-of-the-art analytic techniques developed during
the last years to better describe the late dynamical evolution of binary black
holes of c... | [
{
"created": "Sun, 10 Mar 2002 02:33:57 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2002 18:22:12 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Buonanno",
"Alessandra",
""
]
] | Binary black holes are the most promising candidate sources for the first generation of earth-based interferometric gravitational-wave detectors. We summarize and discuss the state-of-the-art analytic techniques developed during the last years to better describe the late dynamical evolution of binary black holes of com... |
2101.02848 | Karthik Rajeev | Karthik Rajeev, Vikramaditya Mondal and Sumanta Chakraborty | No-boundary Wave Function, Wheeler-DeWitt Equation and Path Integral
Analysis of the Bouncing `Quantum' Cosmology | version published in PRD, 32 pages, 6 figures and 1 table | Phys. Rev. D 103, 106008 (2021) | 10.1103/PhysRevD.103.106008 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Bouncing models are alternatives to inflationary cosmology that replace the
initial Big-Bang singularity by a `bouncing' phase. A deeper understanding of
the initial conditions of the universe, in these scenarios, requires knowledge
of quantum aspects of bouncing models. In this work, we propose two classes of
bounci... | [
{
"created": "Fri, 8 Jan 2021 04:46:39 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 2021 19:46:53 GMT",
"version": "v2"
}
] | 2021-05-27 | [
[
"Rajeev",
"Karthik",
""
],
[
"Mondal",
"Vikramaditya",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | Bouncing models are alternatives to inflationary cosmology that replace the initial Big-Bang singularity by a `bouncing' phase. A deeper understanding of the initial conditions of the universe, in these scenarios, requires knowledge of quantum aspects of bouncing models. In this work, we propose two classes of bouncing... |
1610.07865 | Suddhasattwa Brahma | Suddhasattwa Brahma, Michele Ronco, Giovanni Amelino-Camelia and
Antonino Marciano | Linking loop quantum gravity quantization ambiguities with phenomenology | 12 pages, 3 figures | Phys. Rev. D 95, 044005 (2017) | 10.1103/PhysRevD.95.044005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fundamental quantum gravity theories are known to be notoriously difficult to
extract viable testable predictions out of. In this paper, we aim to
incorporate putative quantum corrections coming from loop quantum gravity in
deriving modified dispersion relations for particles on a deformed Minkowski
spacetime. We sho... | [
{
"created": "Tue, 25 Oct 2016 13:32:25 GMT",
"version": "v1"
}
] | 2017-02-15 | [
[
"Brahma",
"Suddhasattwa",
""
],
[
"Ronco",
"Michele",
""
],
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Marciano",
"Antonino",
""
]
] | Fundamental quantum gravity theories are known to be notoriously difficult to extract viable testable predictions out of. In this paper, we aim to incorporate putative quantum corrections coming from loop quantum gravity in deriving modified dispersion relations for particles on a deformed Minkowski spacetime. We show ... |
1907.06919 | Polina Dyadina | P.I. Dyadina, S.P. Labazova, S.O. Alexeyev | Post-Newtonian limit of hybrid metric-Palatini f(R)-gravity | 13 pages, 2 figures | JETP, vol.156, number 5, pp. 905-917 (2019) | 10.1134/S0044451019110087 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the latest most accurate values of post-Newtonian parameters $\gamma$
and $\beta$ obtained by MESSENGER we impose restrictions on the recently
proposed hybrid f(R)-gravity model in its scalar-tensor representation. We show
that the presence of a light scalar field in this theory does not contradict
the experime... | [
{
"created": "Tue, 16 Jul 2019 09:47:40 GMT",
"version": "v1"
}
] | 2019-10-08 | [
[
"Dyadina",
"P. I.",
""
],
[
"Labazova",
"S. P.",
""
],
[
"Alexeyev",
"S. O.",
""
]
] | Using the latest most accurate values of post-Newtonian parameters $\gamma$ and $\beta$ obtained by MESSENGER we impose restrictions on the recently proposed hybrid f(R)-gravity model in its scalar-tensor representation. We show that the presence of a light scalar field in this theory does not contradict the experiment... |
1803.03255 | Ernesto Contreras | Ernesto Contreras, Angel Rincon, Benjamin Koch and Pedro Bargue\~no | Scale-dependent polytropic black hole | Eur. Phys. J. C (Accepted) | Eur. Phys. J. C (2018) 78:246 | 10.1140/epjc/s10052-018-5709-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we study the scale--dependence of polytropic non-charged
black holes in (3+1)-dimensional space--times assuming a cosmological constant.
We allow for scale--dependence of the gravitational and cosmological couplings,
and we solve the corresponding generalized field equations imposing the null
ener... | [
{
"created": "Thu, 8 Mar 2018 18:53:25 GMT",
"version": "v1"
}
] | 2019-04-01 | [
[
"Contreras",
"Ernesto",
""
],
[
"Rincon",
"Angel",
""
],
[
"Koch",
"Benjamin",
""
],
[
"Bargueño",
"Pedro",
""
]
] | In the present work we study the scale--dependence of polytropic non-charged black holes in (3+1)-dimensional space--times assuming a cosmological constant. We allow for scale--dependence of the gravitational and cosmological couplings, and we solve the corresponding generalized field equations imposing the null energy... |
2404.16599 | Anjali B Yelikar | A. B. Yelikar, R. O' Shaughnessy, J. Lange, and A. Z. Jan | Waveform systematics in gravitational-wave inference of signals from
binary neutron star merger models incorporating higher order modes
information | 7 pages, 6 figures | null | null | LIGO DCC P2400138 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurate information from gravitational wave signals from coalescing binary
neutron stars provides essential input to downstream interpretations, including
inference of the neutron star population and equation of state. However, even
adopting the currently most accurate and physically motivated models available
for p... | [
{
"created": "Thu, 25 Apr 2024 13:26:17 GMT",
"version": "v1"
}
] | 2024-04-26 | [
[
"Yelikar",
"A. B.",
""
],
[
"Shaughnessy",
"R. O'",
""
],
[
"Lange",
"J.",
""
],
[
"Jan",
"A. Z.",
""
]
] | Accurate information from gravitational wave signals from coalescing binary neutron stars provides essential input to downstream interpretations, including inference of the neutron star population and equation of state. However, even adopting the currently most accurate and physically motivated models available for par... |
2004.14395 | Hong Lu | Hai-Shan Liu, H. Lu, Zi-Yu Tang and Bin Wang | Black Hole Scalarization in Gauss-Bonnet Extended Starobinsky Gravity | Latex, 11 pages, reference added | Phys. Rev. D 103, 084043 (2021) | 10.1103/PhysRevD.103.084043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a class of higher-derivative gravities that can be viewed as the
Gauss-Bonnet extension of the Starobinsky model. The theory admits the
Minkowski spacetime vacuum whose linear spectrum consists of the graviton and a
massive scalar mode. In addition to the usual Schwarzschild black hole, we use
numerical an... | [
{
"created": "Wed, 29 Apr 2020 18:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 10 May 2020 12:59:44 GMT",
"version": "v2"
}
] | 2021-04-28 | [
[
"Liu",
"Hai-Shan",
""
],
[
"Lu",
"H.",
""
],
[
"Tang",
"Zi-Yu",
""
],
[
"Wang",
"Bin",
""
]
] | We propose a class of higher-derivative gravities that can be viewed as the Gauss-Bonnet extension of the Starobinsky model. The theory admits the Minkowski spacetime vacuum whose linear spectrum consists of the graviton and a massive scalar mode. In addition to the usual Schwarzschild black hole, we use numerical anal... |
gr-qc/9802048 | David Hochberg | David Hochberg (LAEFF) and Matt Visser (Washington University) | The null energy condition in dynamic wormholes | 4 pages in RevTex; some textual changes made, references added and
some key definitions refined | Phys.Rev.Lett. 81 (1998) 746-749 | 10.1103/PhysRevLett.81.746 | LAEFF-98/02 | gr-qc | null | We extend previous proofs that violations of the null energy condition (NEC)
are a generic and universal feature of traversable wormholes to completely
non-symmetric time-dependent wormholes. We show that the analysis can be
phrased purely in terms of local geometry at and near the wormhole throat, and
do not have to... | [
{
"created": "Wed, 18 Feb 1998 10:23:20 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 1998 17:54:51 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Jun 1998 09:28:10 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Hochberg",
"David",
"",
"LAEFF"
],
[
"Visser",
"Matt",
"",
"Washington University"
]
] | We extend previous proofs that violations of the null energy condition (NEC) are a generic and universal feature of traversable wormholes to completely non-symmetric time-dependent wormholes. We show that the analysis can be phrased purely in terms of local geometry at and near the wormhole throat, and do not have to m... |
2311.05710 | S\'ergio Mittmann dos Santos | Jo\~ao Victor Chaves, S\'ergio Mittmann dos Santos | Spinning cosmic strings in Brans-Dicke gravity as the generators of the
rotational curves of the galaxies | 11 pages, 2 figures, text in Portuguese, work presented at the 23a.
Mostra de Ensino, Pesquisa e Extens\~ao, IFRS, C\^ampus Porto Alegre, 2023 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Only 5% of what makes up the Universe is well understood, and it consists of
baryonic matter and radiation. Dark matter and energy correspond to the
remaining 95% of the Universe, and their origin and evolution have not yet been
satisfactorily explained. Dark matter, supposedly present in the galaxies' halo
region, a... | [
{
"created": "Thu, 9 Nov 2023 19:36:32 GMT",
"version": "v1"
}
] | 2023-11-13 | [
[
"Chaves",
"João Victor",
""
],
[
"Santos",
"Sérgio Mittmann dos",
""
]
] | Only 5% of what makes up the Universe is well understood, and it consists of baryonic matter and radiation. Dark matter and energy correspond to the remaining 95% of the Universe, and their origin and evolution have not yet been satisfactorily explained. Dark matter, supposedly present in the galaxies' halo region, app... |
1907.10057 | Jackson Levi Said | Sebastian Bahamonde, Konstantinos F. Dialektopoulos, Viktor Gakis,
Jackson Levi Said | Reviving Horndeski Theory using Teleparallel Gravity after GW170817 | 12 pages, 0 figures | Phys. Rev. D 101, 084060 (2020) | 10.1103/PhysRevD.101.084060 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Horndeski gravity was highly constrained from the recent gravitational wave
observations by the LIGO Collaboration down to $|c_{g}/c-1|\gtrsim 10^{-15}$.
In this Letter we study the tensorial perturbations in a flat cosmological
background for an analogue version of Horndenki gravity which is based in
Teleparallel Gr... | [
{
"created": "Tue, 23 Jul 2019 13:55:04 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2020 05:48:37 GMT",
"version": "v2"
}
] | 2020-05-01 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Dialektopoulos",
"Konstantinos F.",
""
],
[
"Gakis",
"Viktor",
""
],
[
"Said",
"Jackson Levi",
""
]
] | Horndeski gravity was highly constrained from the recent gravitational wave observations by the LIGO Collaboration down to $|c_{g}/c-1|\gtrsim 10^{-15}$. In this Letter we study the tensorial perturbations in a flat cosmological background for an analogue version of Horndenki gravity which is based in Teleparallel Grav... |
2109.03191 | Valentin Rudenko | A. V. Belonenko, A. V. Gusev, V. N. Rudenko | Precision measurement of gravitational frequency shift of radio signals
using Rao-Cramer estimates | null | null | 10.1134/S0202289321040022 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | A method has been developed for precision measurement of the gravitational
frequency shift of communication radio signals between the spacecraft and the
ground tracking station based on the maximum likelihood principle, using the
Rao-Cramer limit estimates for the kinematic parameters associated with orbital
motion. ... | [
{
"created": "Tue, 7 Sep 2021 16:56:00 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Belonenko",
"A. V.",
""
],
[
"Gusev",
"A. V.",
""
],
[
"Rudenko",
"V. N.",
""
]
] | A method has been developed for precision measurement of the gravitational frequency shift of communication radio signals between the spacecraft and the ground tracking station based on the maximum likelihood principle, using the Rao-Cramer limit estimates for the kinematic parameters associated with orbital motion. Nu... |
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